JP2003041617A - Pantograph type excavator, construction method of continuous wall making use thereof and reinforcing supporting body of structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pantograph type excavator, a construction method of a continuous wall making use thereof and a reinforcing supporting body of a structure. SOLUTION: The pantograph type excavator 100 includes a strut 11 integrally put on a rotary shaft body such as an auger 91 or the like capable of making a vertical motion in a rotatable manner, a movable block 21 moving the strut 11 in the vertical direction by engaging with the rotation of the rotary shaft body, one end side is fixed to the strut 11 in a movable manner, the other end side is fixed to the movable block 21 through a bent section 15 in a movable manner, a bending arm 13 for the bent section 15 to make a forward and backward motion in the horizontal direction with the vertical movement of the movable block 21 and an excavation means for excavating a bedrock by jetting a fluid toward the horizontal direction from the neighborhood of the bent section 15, and it excavates the bedrock in the horizontal direction from a boring hole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavator that can be suitably used when constructing a continuous wall for the purpose of retaining soil, stopping water, etc., an excavating method using the excavator, a method for constructing a continuous wall, and a ground or underground. The present invention relates to a support for reinforcing a structure and a method for constructing the same.

[0002]

2. Description of the Related Art Conventionally, in underground construction for constructing a column-type continuous wall for the purpose of retaining soil or stopping water, the underground continuous wall is constructed by a method of solidifying a mixture of soil and a liquid for consolidation in a hole. Has been built. This method is a construction method called, for example, a soil cement construction method, an SMW construction method (registered trademark), a soil column row wall construction method, a soil column row mountain stopping construction method, etc. (hereinafter, these are collectively referred to as “soil cement construction method”). May be noted). As illustrated in FIG. 11, this soil cement construction method uses a multi-axis kneading auger excavator 90 in which auger heads 93 are attached to the tips of a plurality of (here, three) augers 91 to continuously excavate the natural ground. At the same time as forming the hole, the soil and the liquid material for consolidation such as cement suspension are mixed and stirred in the hole to solidify as soil cement,
It is a method of constructing a continuous wall.

However, when the soil cement construction method is carried out, if there is a buried object 60 such as a buried pipe as shown in FIGS. 12 (a) and 12 (b), it becomes an obstacle and the continuous wall is partially unsuccessful. Since it becomes continuous, a chemical solution injection method that injects a chemical solution from the ground into the back side ground (ground improvement section 53) of the discontinuous portion (that is, around and immediately below the buried object 60) and high-pressure injection. The ground is improved by a method such as a stirring method [Figs. 13 (a) and 13 (b)], and excavation is performed after securing water stoppage. At the same time, wooden and steel horizontal sheet piles 72 are sequentially inserted into discontinuous parts. The landslides have been carried out to prevent flooding and collapse of sediment [Fig. 14
(A), (b)]. However, when the discontinuity width due to underground structures is wide or deep, or in soft ground or ground under high water pressure, ground improvement is insufficient, and flood accidents often occur. . Therefore, when constructing a continuous wall, it is necessary to construct a soil retaining wall having a sufficient waterproofness and strength just below the underground structure by a safe and reliable method.

On the other hand, in various structures supported by the ground, including ground and underground structures, the structure can be easily reinforced as a measure against liquefaction and ground subsidence caused by an earthquake or the like. There was a demand for the development of low cost technology. In response to such a request, it is considered effective to construct a support for reinforcement by excavating the ground immediately below them in the minimum necessary range while maintaining the structure as it is. . However, for example, the conventional excavation means such as a multi-axis auger excavator is a method of excavating from the ground surface toward the ground directly below, so the structure interferes and the ground beneath it is excavated. However, it was extremely difficult to construct a reinforcing support directly under the structure while keeping the structure as it is.

[0005]

DISCLOSURE OF THE INVENTION The present invention provides an excavator and a method for excavating a buried object or a structure directly under the structure, and also provides a method for excavating a buried object or a structure directly under a soil cement method. It is an object to provide a method capable of constructing a continuous wall including the above, and further to provide a support body capable of reinforcing and supporting an existing structure from the ground.

[0006]

In order to solve the above problems, the invention of a pantograph type excavator according to claim 1 is
A support column that is integrally rotatably mounted on one or a plurality of rotary shafts that can move up and down, and a movable block that vertically moves on the support column in association with the rotation of the rotary shaft. And one end side is swingably fixed to the pillar, and the other end side is swingably fixed to the movable block via a bent portion, and the bent portion is moved along with the vertical movement of the movable block. A bending / extending arm that moves back and forth in the lateral direction, and an excavating means that is provided in the vicinity of the bent portion and excavates the rock in the lateral direction,
It is characterized by having.

The excavator of the present invention is an excavator equipped with a bending / extending arm having a pantograph-like shape and an excavating means for excavating the ground in the lateral direction (hereinafter referred to as "pantograph excavator"). Despite the simple structure, it is possible to easily excavate the lateral ground from the drilled hole without expanding the drilled hole. Therefore, even when there are underground structures such as aboveground structures and buried pipes, the ground beneath them can be excavated without being obstructed by those structures. If it is used when constructing a continuous underground wall, it will be possible to construct a continuous wall directly below the buried object. Further, since the pantograph-shaped bending / extending arm can adjust the advancing / retreating in the lateral direction according to the size of the structure, it is possible to surely excavate even when the structure is wide. Further, the excavation area directly below the structure, which is difficult to confirm from the ground, can be easily grasped by moving the bending / extending arm laterally.

In the invention of the pantograph type excavator according to claim 2, in claim 1, as the excavation means, the first excavation means and / or the excavation means for injecting a fluid toward the excavation and excavate the rock. A second excavation means for abutting and excavating is provided. According to this feature, when the first excavating means for injecting a fluid toward the natural ground to excavate is provided as the excavating means, the lateral rock can be easily excavated by the jet flow of the fluid. Further, when the second excavation means for excavating in contact with the natural ground is provided as the excavation means, it is possible to reliably excavate the lateral natural ground. Further, by arranging both the first excavating means and the second excavating means, for example, it is possible to surely excavate the remaining ground by the second excavating means by excavating by the first excavating means. , The first excavation means and the second excavation means can be utilized while complementing each other for reliable excavation. Here, the first excavating means is exemplified by a mechanism for injecting a fluid at a high pressure from an injection nozzle, and the second excavating means is exemplified by a cutter bit or the like provided at the tip of the bent portion.

The invention of a pantograph type excavator according to a third aspect is the one according to the first aspect or the second aspect, wherein the pantograph type excavator is detachably attached to the tip of the auger excavator in place of the auger head. Is characterized in that. Since the pantograph type excavator can be attached to the auger instead of the auger head of a general-purpose auger excavator,
It is not necessary to increase the number of heavy equipment, and it is possible to suppress the cost increase. As the power of the pantograph type excavator, the power of the auger excavator can be used as it is,
No new power unit is needed. Further, since the pantograph type excavator is easily attached to and detached from the auger, it becomes possible to perform lateral drilling subsequent to the boring work by the auger excavator, and there is no need to replace the entire heavy machine. Therefore, by using this pantograph type excavator, the steps from drilling to horizontal excavation can be executed in a short time.

The invention of the excavating method described in claim 4 is characterized in that the pantograph type excavator according to any one of claims 1 to 3 is used to excavate a ground laterally from a drilled hole. And According to this feature, the same effect as that of any one of claims 1 to 3 can be obtained in the excavation method.

The invention of a method for constructing a continuous wall according to claim 5 is a method for constructing a continuous wall for constructing a continuous underground wall by a method of solidifying a mixture of soil and a liquid material for consolidation in a hole. The excavation method according to claim 4 excavates the ground directly below the ground or underground structure, and constructs a continuous wall including the excavated portion. According to this feature, for example, when constructing a continuous underground wall by the soil cement method for the purpose of a retaining wall or a water blocking wall, it is possible to easily construct a continuous wall directly under the structure, which was impossible in the past. It becomes possible to do. In other words, since the ground beneath the structure can be easily excavated by the pantograph excavator, a continuous wall can be constructed by a simple operation by solidifying the soil and the liquid material for consolidation in the drill hole including the excavated portion. it can. Therefore, unlike the conventional method, it is not necessary to improve the ground around the structure, and the collapse of the earth and sand can be surely prevented, so that the construction that shortens the construction period and secures safety can be realized. In particular, if the pantograph type excavator to be used is installed in place of the auger head of a general-purpose auger excavator, the power of the auger excavator can be used as it is, and no separate heavy equipment or new power unit is required, thus reducing the construction cost. It can be kept low.
In addition, excavation of the ground directly under the structure can be performed subsequent to the drilling process by the auger excavator, and since the soil cement wall can be formed including the part directly under the structure, continuous wall construction by the soil cement construction method is possible. It is easy to incorporate as a series of steps in the process. In addition, since it is possible to omit the soil improvement around the structure and the soil retaining work by the horizontal sheet pile in the conventional construction method, it is possible to shorten the construction period and reduce the cost.

The invention of a method for constructing a continuous wall according to claim 6 is a method for solidifying a mixture of soil and a liquid for caking in a hole in a ground where an aboveground or underground structure exists. A method for constructing a continuous wall for constructing a continuous wall, replacing the auger head at the auger tip of an auger excavator,
A support pillar that is mounted so as to be rotatable integrally with the auger, a movable block that moves up and down on the support pillar in conjunction with rotation of the auger, and one end side is fixed to the support pillar so as to be swingable, A bending / extending arm, the other end of which is swingably fixed to the movable block through a bending portion, and the bending portion moves back and forth in the horizontal direction as the movable block moves up and down, and the vicinity of the bending portion. The excavation means for excavating the ground in the lateral direction, and using a pantograph-type excavator, first, excavate the ground at a position adjacent to the structure with an auger excavator to form a hole. Form, then raise the auger excavator once, install the pantograph type excavator, insert into the drilling hole and excavate the ground directly below the ground or underground structure laterally from the drilling hole After that, the liquid material for consolidation is placed in the hole. Solidified with input to the soil, characterized by constructing a continuous wall, including the right under the ground or underground structures. According to this feature, the same effect as that of the fifth aspect can be obtained.

The invention of a method for constructing a support according to claim 7 is a method for constructing a support for reinforcing and supporting an existing above-ground or underground structure in the ground, which comprises a tip of an auger tip of an auger excavator. Instead of an auger head, a pillar mounted so as to be rotatable integrally with the auger, a movable block that moves up and down on the pillar in conjunction with rotation of the auger, and one end swings on the pillar. And a bending / extending arm in which the other end side is swingably fixed to the movable block via a bent portion, and the bent portion moves back and forth in the lateral direction as the movable block moves up and down. Using a pantograph type excavator provided with a means for excavating a rock in the lateral direction provided in the vicinity of the bent portion, first, a rock in a position adjacent to the structure is excavated by an auger drill. To form a hole Next, the auger excavator is once lifted, the pantograph type excavator is attached, and after excavating the ground just below the ground or underground structure laterally from the drilled hole by drilling, It is characterized in that the caking fluid is solidified in the drilled hole to construct a support body that integrally supports the lower side surface portion and the lower surface edge portion of the structure. According to this feature, a pantograph-type excavator is used to excavate the ground directly below the existing structure, and the solidified fluid such as concrete or soil cement is solidified in the excavated portion to remove the existing structure. It is possible to construct a support body integrally reinforcing and supporting from the side surface lower part and the lower surface edge part. That is, it is possible to construct a support body that reinforces and supports an existing structure from the lower surface, which has been difficult in the past, and has an advantage that the drilling range can be minimized.

The invention of the reinforcing support having a substantially L-shaped cross-section according to claim 8 is characterized in that, in the ground, the side surface lower part and the lower surface edge part are integrally supported. According to this feature, the reinforcing support having a substantially L-shaped cross section integrally supports and reinforces the existing structure from the lower side surface and the lower surface edge, so that the existing structure is liquefied in case of an earthquake. It is effective as a measure against ground subsidence.

The invention of the method for constructing a continuous wall according to claim 9 is a method for constructing a continuous wall in which an underground continuous wall is constructed by a method of solidifying a mixture of soil and a liquid material for consolidation in a hole. The excavation method for a support body is formed by excavating the ground in a lateral direction substantially orthogonal to a wall surface of a continuous wall to be constructed by the excavation method according to claim 4, and the inside of the drilled hole including the support excavation section. By solidifying the mixture of soil and the liquid material for consolidation with, the continuous wall is constructed, and at the same time, the support body for reinforcing and supporting the continuous wall is constructed integrally. This continuous wall construction method uses a pan cement type excavator to form a support excavation part in a lateral direction that is substantially orthogonal to the wall surface of the continuous wall to be constructed in the construction of the continuous wall by the soil cement method. Since the support that reinforces and supports the continuous wall can be constructed at the same time as the construction of the continuous wall, the continuous wall reinforced by the support and having a high passive earth pressure can be compared with the construction of the normal continuous wall. It can be constructed with almost no additional steps.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in more detail with reference to the drawings. FIG. 1 is a drawing for explaining an excavation method by a pantograph excavator 100 according to an embodiment of the present invention, and FIGS. 1A and 1B show a pantograph excavator 100 having a multi-axis auger excavator. An auger head 90 (not shown here) is attached to the auger 91 of 90, and FIG. 1C shows a range in which the pantograph excavator 100 can excavate.

This pantograph excavator 100 has three columns 11 rotatably attached to the tip of an auger 91 as a rotary shaft that can move up and down, and three columns 11 interlocked with the rotation of the auger 91 on the column 11. And a movable block 21 that moves in the up-down direction, and one end side that is swingably fixed to the support column 11 by a fixing portion 23, and the other end side is fixed to the movable block 21 via a rotatable bending portion 15. The bending / extending arm 13 is fixed so as to be swingable, and the excavating means is provided near the bending portion 15.

The multi-axis auger machine 90 equipped with the pantograph type excavator 100 is a well-known excavator that is preferably used in a construction scene such as a soil cement method for forming a hole (see FIG. 11). Multi-axis auger machine 90
Here, although it has three augers 91 as a rotating shaft body here, it is not limited to this, and one having one or a plurality of augers 91 can be used.

The pantograph excavator 100 has a joint 9
5, the auger 91 of the multi-axis auger machine 90 is rotatably attached to the tip of the auger 91 by a connecting means (not shown) in place of the auger head. That is, the joint portion 95 can be mounted in the same structure as the mounting structure of the auger head of the multi-axis auger machine 90, for example, the auger 91.
The column 11 can be fitted by a simple method such as fitting the column 11 to the tip and inserting a retaining pin into the fitting portion.

The three columns 11 of the pantograph excavator 100 are bundled by upper and lower holding portions 25a and 25b so that each of the three columns 11 can rotate in association with the rotation of the auger 91. Here, the movable block 21 can be moved up and down in conjunction with the rotation of the column 11 by a screw structure 12 such as a square screw that is engraved on the two columns 11 so as to straddle the two columns 11. It has been deployed.

The bending / extending arm 13 is swingably fixed to the support column 11 at one end side, and is swingably fixed to the movable block 21 at the other end side through a rotatable bending portion 15. . In the present embodiment, the movable block 21
An auxiliary arm 14 is provided to smoothly perform the vertical movement of the. The bent portion 15 of the bending / extending arm 13 is rotatably connected by, for example, a hinge structure.

As shown in FIG. 2, as a first excavating means near the bent portion 15, a fluid 55 sent by a fluid carrying means (not shown) is directed toward the natural ground 50, and jetting at a high pressure is possible. An injection nozzle 17 is provided. As the fluid jetted from the jet nozzle 17, for example, a gas such as air, a liquid such as water, a liquid material for consolidating such as cement milk, a powder such as iron powder or sand, a mixture selected from them, and the like are used. You can In addition, a cutter bit 16 is provided at the tip of the bent portion 15 as a second excavating means that excavates by contacting the natural ground.

As shown in FIG. 1A, the movable block 2 is rotated by the rotation of the auger 91 of the multi-axis auger excavator 90.
1 moves up and down. With the movement of the movable block 21,
The bending / extending arm 13 advances or retracts the bent portion 15 in the lateral direction, and bends / extends in a motion like a pantograph. The horizontal movement of the bending / extending arm 13 and the vertical movement of the entire auger 91 cause the injection nozzle 17 to move.
It is possible to excavate a natural rock in a desired range by adjusting the position of the fluid injection from the contact point and the contact position of the cutter bit 16. Further, the excavation range of the excavator 100 according to the present embodiment is, as shown in FIG. 1C, a side portion of the drilled hole 81 by the three augers 91 arranged in a line.

Based on the above, the excavation method by the excavator 100 of this embodiment will be described with reference to FIGS. 3 to 6 by taking an example of constructing a continuous wall in the ground where an embedded object exists. 3 to 6, (a) is a drawing showing a state of the ground as seen from above, and (b) is a drawing showing a state of a cross section as seen from the lateral direction.

First, as shown in FIG. 3, according to the procedure of the soil cement method, a multi-axis auger excavator (see FIG. 11).
The ground is excavated vertically from the surface of the earth using, and the formed holes 81a and 81b are filled with the collapse prevention liquid 58. At this stage, since the buried object 60 exists, the rocks 50 above and below the buried object 60 cannot be excavated and remain.

Next, as shown in FIG. 4, one of the holes adjacent to the natural ground 50 where the buried object 60 is present (drilling hole 8 for earth removal).
In 1b), a suction pipe 41 for discharging excavated soil is provided along the H steel 71 for guide. Suction pipe 4
1 is connected to the suction pump 42 arranged on the ground,
Further, the suction pump 42 is connected to the dehydrator 43. In this state, since the inside of the drill hole 81 is filled with the collapse preventing liquid 58, the collapse of surrounding rocks can be prevented by the hydraulic pressure inside the drill hole.

Next, the auger head 93 (see FIG. 11) at the tip of the multi-axis auger excavator is removed, and the pantograph excavator 100 is attached instead, and the other excavator adjacent to the natural ground is removed as shown in FIG. It is inserted into the hole (drilling hole 81a). Then, the fluid 55 is jetted from the jet nozzle 17 of the pantograph type excavator 100 toward the ground below the buried object 60 to perform the primary excavation of the ground directly below the buried object 60. When excavating the natural ground, the vertical movement of the auger 91 and the bending arm 1
By bending the injection nozzle 17 in the lateral direction and moving the injection nozzle 17 back and forth, the rock mass is excavated in a desired range while adjusting the excavation range and the strength of the jet flow colliding with the rock mass. The excavated soil is pumped up by the suction pump 42, the water is removed by the dehydrator 43, and then the excavated soil is collected.

After the primary excavation of the ground 50 directly below the buried object 60 is completed, as shown in FIG.
1 and the pillar 11 are rotated to form a screw structure 1
It is also possible to lower the movable block 21 that engages with 2 to advance the bent portion 15 of the bending / extending arm 13 toward the natural ground 50, and excavate with the cutter bit 16 as the second excavating means. By doing so, it is possible to reliably remove the earth and sand left behind by excavating the fluid. Further, by bringing the cutter bit 16 into contact with the natural ground 50, it is possible to confirm the excavation range (excavation section 83) that is difficult to grasp from the ground.

After the excavation of the rock mass 50 is completed immediately below the buried object 60, the excavated soil and the liquid material for consolidation (cement suspension, etc.) are mixed and stirred to solidify, and the earth retaining wall 7
Build 0 (Figure 6). In this way, it is possible to integrally construct a continuous wall 70 having high water-stopping property and soil retaining strength even in the ground directly below the buried object 60, which was conventionally difficult to construct. When the continuous wall 70 is required to have high strength, it is possible to secure sufficient strength by building a core material such as H steel 71 in the drilled hole 81 as needed.

FIG. 7 is a diagram showing an outline of the excavation method by the pantograph type excavator 101 according to the second embodiment of the present invention, and is a state in which three augers 91 and columns 11 are viewed from the side (that is, the paper surface). (There are two augers 91 (not shown) in a direction orthogonal to the above). In the pantograph type excavator 100 of the first embodiment, as shown in FIG.
As shown in (c), the cutter bit 16 and the ejection nozzle 17 are moved back and forth to the side (in the same direction as the wall surface of the continuous wall 70 to be built) of the three augers 91 arranged in a line. The pantograph excavator 101 of the second embodiment has a cutter bit 16 and a jet nozzle 17 in a direction orthogonal to the arrangement direction of the three augers 91.
To move back and forth. With such a configuration, it becomes possible to excavate the ground in a direction orthogonal to the direction in which the augers 91 are arranged [see FIG. 7 (c)], and various applications can be developed as described later. . Since other configurations in the second embodiment are similar to those in the first embodiment, the same components are designated by the same reference numerals and description thereof will be omitted.

The pantograph type excavator of the present invention and the excavating method using the same have the feature that the ground can be excavated laterally from the drilled hole without expanding the drilled hole. It can be used for various purposes.

FIG. 8 shows, as an application example of the pantograph type excavator and excavation method of the present invention, a support body (L-shaped section) having a substantially L-shaped cross section for reinforcing and supporting an existing structure 61 such as an underground tank from the ground. It is drawing which shows the state which constructed | assembled the die support body) 75. FIG. 8A shows a state of the ground as seen from the lateral direction, FIG. 8B shows a state of a cross section taken along line AA of FIG. 8A, and FIG. 8C shows FIG. 8A. 2 shows a state of a cross section taken along line BB of FIG. In the conventional auger excavator and the like, since the ground directly below the structure 61 [the portion indicated by the symbol U in FIG. 8A] cannot be excavated,
It was virtually impossible to construct the L-shaped support 75 as shown in the existing structure 61, but the pantograph excavator of the present invention enables excavation directly below the structure. Therefore, it becomes possible to attach the L-shaped support body 75 that supports the existing structure 61 from the bottom surface in the ground. L-shaped support 7
In the construction of No. 5, first, a normal multi-axis auger excavator (see FIG. 11) is used to drill a hole around the structure 61 with a predetermined depth to reach the support ground (shown by the broken line 87) in FIG. The holes are formed at arbitrary intervals, and then the ground mass directly below the lower edge of the structure 61 such as an underground tank is excavated laterally from the drilled hole by the pantograph excavator 100 according to the first embodiment of the present invention. In this way, after excavating the rocks below the side surface lower portion and the lower surface edge of the structure 61, by solidifying the solidifying fluid such as concrete or soil cement in the excavated portion, the structure 61 is moved to the lower surface edge. It is possible to construct the L-shaped support body 75 that firmly supports and supports the portion and the lower portion of the side surface. As shown in FIG. 8, the upper portion of the L-shaped support body 75 may be backfilled to be hidden from the ground. The L-shaped support body 75 is to reinforce and support the structure 61 from the ground while maintaining the structure 61 as it is, and therefore is extremely effective for countermeasures against liquefaction during earthquakes and suppression of sedimentation ground, for example. Moreover, the strength, size, and arrangement of the L-shaped support 75 can be freely set according to the size of the structure 61 and the strength of the ground.

FIG. 9 shows an example in which a support body 77 is constructed to reinforce and support the earth retaining wall 70 from the inside of the earth retaining wall 70 in the ground. 9 (a) shows a state of the soil in the cross section of the soil retaining wall 70 as seen from the lateral direction, and FIG. 9 (b) shows the cross section of the line C-C in FIG. 9 (a). The same (c) is DD of (a)
It shows the state of the cross section along the line. Here, the support 77 can be constructed simultaneously with the construction of the earth retaining wall 70 by using the pantograph type excavator 101 of the second embodiment. The construction method in this case is the process of constructing the earth retaining wall 70 by the soil cement method, and using the pantograph type excavator 101 of the second embodiment, from the drilling for the continuous wall construction to the planned continuous wall construction. By making an excavation space for constructing a support in the transverse direction in a direction orthogonal to the plane and solidifying the soil cement including the excavation space,
Reinforcing support 7 integrally formed with the earth retaining wall 70
Build 7.

FIG. 9 (c ') is a drawing showing another embodiment in which the shape of the support 77 is changed, and shows the state of the cross section corresponding to FIG. 9 (c). Pantograph excavator 10
In the excavation by No. 1, since the direction of the injection nozzle 17 can be adjusted, the shape (cross-sectional view) of the support body 77 can be obtained by ejecting the fluid 55 radially to perform excavation.
As shown in (c ′), it can be formed in a substantially wedge shape with a widened end. With such a shape, the reinforcing effect of the support 77 can be further enhanced.

FIG. 10 is a drawing showing still another application example, in order to prevent water leakage to the land side around various pipes 62 such as trough pipes buried in the soil such as rivers and reservoirs, A water blocking wall 79 is provided around the pipe 62. FIG. 10A shows a state of the ground as seen from the cross-sectional direction of the pipe 62, FIG. 10B shows a cross-sectional state taken along the line EE of FIG. 10A, and FIG. ) Shows a state of a cross section viewed from the line FF (note that the pipe 62 is not drawn as a cross section). In this case, the buried pipe 62
After excavating the ground adjacent to the ground from the surface by an auger excavator or the like to form a hole having a predetermined depth, for example, the pantograph excavator 101 according to the second embodiment of the present invention.
Thus, the ground around the pipe 62 is excavated, and a water blocking wall 79 made of soil cement or the like is formed around the pipe 62. In this way, it is not necessary to excavate the ground directly above the buried pipe 62, and it is possible to take measures against water leakage within the minimum required excavation range. Here, the example for stopping water has been described, but it is also possible to prevent the embedded pipe from rising by constructing a support having the same structure.

Although the present invention has been described with reference to various embodiments, the present invention is not limited to the above embodiments, and other embodiments are also possible within the scope of the invention described in the claims. Of course, it is applied.

For example, in the above embodiment, the columns 11 of the pantograph type excavators 100 and 101 are three, which is the same as the number of the augers 91, but may be two, for example, and when the number of the augers 91 is large. May be provided with more columns 11.

The pantograph type excavators 100, 10
The number of bending and stretching arms 13 provided in one is not limited to one, and for example, a plurality of bending and stretching arms 13 may be provided in the same direction or different directions.

Further, in the above embodiment, the pantograph type excavators 100 and 101 are configured so that they can be attached to and detached from the auger head of the existing auger excavator in place of the auger head. It may be a dedicated device. The pantograph excavator in this case may be a device having a mechanism similar to that of the auger excavator, except for the characteristic configuration of the bending / extending arm 13 and the like.

As the soil cement construction method, which is a premise of the method for constructing a continuous wall of the above-mentioned embodiment, various methods are known, in which the timing of injecting the liquid material for consolidation and the timing of kneading with soil are different. The present invention is applicable to all. Also, for example, drilling with an auger drilling machine and drilling the ground directly below the buried object can be performed continuously as a series of processes, or after all drilling is completed, drilling directly below the buried object. You may go at different times, such as doing.

[0041]

INDUSTRIAL APPLICABILITY The pantograph type excavator of the present invention has a simple structure, but it can excavate the ground in the lateral direction from the drilled hole without expanding the drilled hole.
Even if there are underground structures such as buried pipes, the ground beneath them can be easily excavated. For example, if it is used when constructing a continuous underground wall for the purpose of retaining walls or water blocking walls, it will be possible to construct a continuous wall directly under the buried object, and it is usually difficult to build. It can be applied in various situations, such as the construction of supports that support and reinforce existing structures from the ground.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an excavation method using a pantograph excavator according to a first embodiment of the present invention, in which (a) a bending and extending arm is extended, (b) a bending and bending arm is bent, and c) shows a state in which the excavation area in the ground is viewed from above.

2 is an enlarged view of a main part of the pantograph type excavator of FIG. 1, (a) is a partial plan view (a part is a sectional view), and (b) is a partial side view.

FIG. 3 is a diagram which is used for explaining a method for constructing a continuous wall of the present invention, schematically showing a state in which a hole has been formed, and (a) is a state in which the state of the hole in the ground is viewed from above. , (B) are cross-sectional states as viewed from the lateral direction.

FIG. 4 is a diagram which is used for explaining a method for constructing a continuous wall of the present invention, schematically showing a state in which fluid is jetted by a pantograph type excavator to perform primary excavation, and (a) is an excavation in the ground. The state of the hole is viewed from above, and FIG. 6B is the state of the cross section viewed from the lateral direction.

FIG. 5 is a diagram which is used for explaining a continuous wall construction method of the present invention, and schematically shows a state in which secondary excavation is performed by a cutter bit of a pantograph type excavator, and (a) shows a hole drilled in the ground. The state is seen from above, and (b) is the state of the cross section seen from the lateral direction.

[Fig. 6] Fig. 6 is a diagram for explaining a method for constructing a continuous wall of the present invention, schematically showing a state in which soil cement is solidified, and (a) is a state of a hole drilled in the ground as viewed from above. , (B) are cross-sectional states as viewed from the lateral direction.

7A and 7B are drawings for explaining an excavating method by a pantograph excavator according to a second embodiment of the present invention, in which FIG. 7A is a state in which a bending and extending arm is extended, and FIG. 7B is a state in which the bending and extending arm is bent, (C) shows a state in which the excavation area in the ground is viewed from above.

FIG. 8 is a drawing for explaining one mode of a reinforcing support body built by using a pantograph excavator;
Shows the state of the ground from the side, (b) shows (a)
The state on the line A-A of FIG. 6A and the state on the line BB of FIG.

FIG. 9 is a drawing which is used for explaining another aspect of the reinforcing support body which is built using the pantograph excavator;
(A) shows the state of the cross section of the underground continuous wall seen from the lateral direction, (b) shows the state along the line CC of (a), (c)
And (c ') schematically show the states of (a) taken along the line D-D, respectively.

FIG. 10 is a drawing for explaining a water blocking wall built around a buried pipe using a pantograph excavator,
(A) shows the state of the ground as seen from the cross-sectional direction of the pipe,
(B) schematically shows the state along the line EE of (a), and (c) schematically shows the state along the line FF of (a).

FIG. 11 is a view showing an example of a conventional 3-axis auger excavator.

FIG. 12 is a diagram which is used for explaining a manufacturing process of a continuous wall by a conventional method, in which (a) is a state in the ground [G-G of (b)].
Line cross section] as viewed from above, and (b) schematically shows a cross section viewed from the lateral direction.

FIG. 13 is a diagram for explaining a manufacturing process of a continuous wall by a conventional method, in which (a) is a state in the ground [H-H in (b)].
Line cross section] as viewed from above, and (b) schematically shows a cross section viewed from the lateral direction.

FIG. 14 is a diagram for explaining a manufacturing process of a continuous wall by a conventional method, in which (a) is a state in the ground [II of (b)].
Line cross section] as viewed from above, and (b) schematically shows a cross section viewed from the lateral direction.

[Explanation of symbols]

11 props 12 screw structure 13 bending arm 14 Auxiliary arm 15 Folding section 16 cutter bits 17 injection nozzle 21 Movable block 23 Fixed part 25a Upper holding part 25b Lower holding part 41 Suction pipe 42 Suction pump 43 Dehydrator 50 ground 53 Ground Improvement Department 55 fluid 58 Anti-collapse liquid 60 buried objects 61 Structure 62 buried pipe 70 continuous walls 71 H steel 72 horizontal sheet pile 73 soil cement 75 L-shaped support 77 Support 79 Water stop wall 81 Drilling 81a Drilling hole 81b Drilling holes for earth removal 83 Excavator 90 Auger Excavator 91 Auger 93 Auger Head 95 joint 100, 101 Pantograph excavator

   ─────────────────────────────────────────────────── ─── Continued front page    (71) Applicant 000149206             Osaka Waterproof Construction Co., Ltd.             7-6 Baishashicho, Tennoji-ku, Osaka City, Osaka Prefecture (71) Applicant 391019740             Sanshin Construction Industry Co., Ltd.             1-2-7 Koraku, Bunkyo-ku, Tokyo (72) Inventor Koji Matsumoto             5-29-25 Oizumi Gakuenmae, Nerima-ku, Tokyo (72) Inventor Masatsugu Mori             31 Ichibancho, Chiyoda-ku, Tokyo             Within Takagumi (72) Inventor Kazuka Fukada             31 Ichibancho, Chiyoda-ku, Tokyo             Within Takagumi (72) Inventor Komitsu Komitsu             1-7-24 Otemae, Chuo-ku, Osaka-shi, Osaka               Naruyuki Kogyo Co., Ltd. (72) Inventor Kiyoshi Hayashi             1-7-24 Otemae, Chuo-ku, Osaka-shi, Osaka               Naruyuki Kogyo Co., Ltd. (72) Inventor Yusuke Shinozuka             2-11-13 Ichinoe, Edogawa-ku, Tokyo Stock             Ceremony company Osaka waterproof construction company (72) Inventor Toshiyuki Motohashi             2-11-13 Ichinoe, Edogawa-ku, Tokyo Stock             Ceremony company Osaka waterproof construction company (72) Inventor Ryoichi Tanaka             1-2-7 Koraku, Bunkyo-ku, Tokyo Sanshinken             Inside the construction industry (72) Inventor, Masao Kikuchi             1-2-7 Koraku, Bunkyo-ku, Tokyo Sanshinken             Inside the construction industry F-term (reference) 2D049 GA12 GA14 GC11 GD01

Claims (9)

[Claims] 1. A support column that is integrally and rotatably mounted on one or a plurality of rotary shafts that can move up and down, and a vertical direction on the support column in association with the rotation of the rotary shaft. And a movable block that is movable to the movable block, one end of which is swingably fixed to the column, and the other end of which is swingably fixed to the movable block through a bent portion. A pantograph excavator comprising: a bending / extending arm in which the bent portion moves back and forth in a lateral direction; and an excavating means provided in the vicinity of the bent portion for excavating a natural ground in the lateral direction. 2. The excavation means according to claim 1, wherein the excavation means is a first excavation means for injecting a fluid toward a natural rock to excavate and / or a second excavation means for excavating in contact with the natural rock. The pantograph type excavator characterized by having done. 3. The pantograph excavator according to claim 1, wherein the pantograph excavator is detachably attached to a tip of the auger excavator in place of an auger head. . 4. An excavation method for excavating a natural ground laterally from a hole using the pantograph excavator according to any one of claims 1 to 3. 5. A method of constructing a continuous underground wall by a method of solidifying a mixture of soil and a liquid for consolidation in a drilling hole, the method of constructing a continuous wall according to claim 4, A method for constructing a continuous wall, which comprises excavating a ground directly under an object and constructing a continuous wall including the excavated portion. 6. A method of constructing a continuous underground wall by a method of solidifying a mixture of soil and a liquid material for consolidation in a hole when the ground or underground structure exists in the ground. In place of the auger head at the tip of the auger of the auger excavator, a pillar mounted so as to be rotatable integrally with the auger, and a movable block that moves up and down on the pillar in conjunction with rotation of the auger, One end side is swingably fixed to the pillar, and the other end side is swingably fixed to the movable block through a bent portion, and the bent portion is laterally moved as the movable block moves up and down. Using a pantograph type excavator provided with a bending and stretching arm that moves back and forth to, and an excavating means that is provided in the vicinity of the bending portion and that excavates the ground in the lateral direction, first, at a position adjacent to the structure. Auger excavator Excavation to form a hole, then raise the auger excavator once, mount the pantograph type excavator, insert into the hole and laterally extend from the hole to a ground or underground structure After excavating the rock mass directly below, solidification liquid is injected into the drilled hole to solidify with the soil, and a continuous wall is constructed including immediately below the ground or underground structure, How to build a continuous wall. 7. A method of constructing a support for reinforcing and supporting an existing aboveground or underground structure in the ground, which is replaceable with an auger head at an auger tip of an auger excavator and is rotatable integrally with the auger. And a movable block that moves up and down on the column in conjunction with the rotation of the auger, one end side is swingably fixed to the column, and the other end via a bent portion. The side is swingably fixed to the movable block, and the bending portion moves back and forth in the lateral direction as the movable block moves up and down, and in the lateral direction provided in the vicinity of the bending portion. Using a pantograph type excavator equipped with an excavating means for excavating the ground, first, the ground at a position adjacent to the structure is excavated by an auger excavator to form a hole, and then the auger Raise the excavator once After mounting the pantograph type excavator and excavating the ground directly below the ground or underground structure laterally from the drilling hole by inserting into the drilling hole, a solidifying fluid is formed in the drilling hole. A method for constructing a support, which comprises solidifying and constructing a support that integrally supports a lower side surface portion and a lower surface edge portion of a structure. 8. A reinforcing support having a substantially L-shaped cross section, which integrally supports a lower side surface portion and a lower surface edge portion of a structure in the ground. 9. A continuous wall construction method for constructing a continuous underground wall by a method of solidifying a mixture of soil and a liquid for consolidation in a drilling hole, the continuous construction planned for construction by the excavation method according to claim 4. The ground is excavated in the lateral direction substantially orthogonal to the wall surface to form the support excavation portion, and the mixture of the soil and the liquid condensate is solidified in the hole including the support excavation portion. Thus, at the same time as the construction of the continuous wall, the support body for reinforcing and supporting the continuous wall is integrally constructed, and the method for constructing the continuous wall.