JP4950525B2 - Non-cutting replacement renewal method - Google Patents

Description

  The present invention relates to a non-open-cut replacement renewal method in which replacement is performed by pulling a new rehabilitation pipe while crushing an existing pipe buried in the ground, and in particular, the existing pipe that has been crushed is exposed in the soil. The present invention relates to a non-cutting replacement renewal method that does not have a risk of failure.

  Conventionally, when an existing pipe buried in the ground has deteriorated or when it is desired to replace it with a pipe having a different diameter, a replacement pipe and a replacement method for replacement are known (see, for example, Patent Document 1). ).

  In such a case, when the existing pipe buried in the ground is made of non-metal such as synthetic resin, asbestos, or ceramic, the rod is inserted into the existing pipe without excavating the ground surface. Then, a cutting blade is attached to the tip of the rod, and a rehabilitation pipe is attached to the cutting blade and pulled.

  For this reason, while the existing pipe is torn from the inside by the cutting blade, the renovated pipe is drawn into the ground at a position substantially the same as the position where the existing pipe is embedded.

At this time, since the outer peripheral surface of the existing pipe is covered with the synthetic resin film, even if the rehabilitation pipe is made of synthetic resin such as polyethylene resin, the surface is hardly damaged.
JP-A-11-117676 (paragraphs 0024 to 0041, FIG. 1)

  However, in the construction method of replacing the buried pipe constructed in this way, when the existing pipe buried in the ground is torn by the cutting blade attached to the tip of the rod, it becomes a large fragment, It will be left in the ground outside the rehabilitated pipe.

  For example, when the existing pipe fragments are made of synthetic resin, the decomposition is not promoted and remains. In addition, when it is a nonmetal such as asbestos or ceramic, it has been necessary to take a separate measure to prevent it from being dispersed in the ground.

  In particular, in the case of asbestos pipes, there was a risk of asbestos scattering due to the asbestos pipe being exposed to the ground due to an unexpected excavation at a later date.

  Therefore, an object of the present invention is to provide a non-opening replacement renewal method in which crushed pieces of existing pipe can be integrally held around the rehabilitated pipe without being dispersed.

In order to achieve the above object, according to the invention described in claim 1, the existing pipe embedded in the ground is crushed by a preceding reamer, and the rehabilitated pipe connected to the reamer is crushed. It is a non-open-cut replacement renewal method that pulls into the space and updates it,
Fragments of the crushed existing pipe, with the soil, The rewritable injected soil hardening agent to solidify integrally around the further production tube, the soil hardening agent as a main component a liquid cement which solidifies after a predetermined time has elapsed A reamer main body having an injection hole for injecting the soil hardening agent supplied through a passage provided therein from an outer surface, the reamer main body being connected to a drill rod that is driven to rotate. A conical tip formed in the vicinity of the tip of the reamer body in the crushing direction and a cylindrical body integrally extending from the conical tip, and projecting from the side of the conical tip. A first projecting blade that crushes the existing pipe by rotation of the reamer main body, and is provided on the outer surface of the cylindrical body, and projects outward beyond the projecting amount of the first projecting blade. By the first protrusion blade. Than the conduit diameter formed Te, while expanded so that the large pipe diameter, the pieces of crushed existing pipe, trenchless provided with a second protrusion edge to be stirred and mixed into the surrounding soil hardening agent It features a replacement update method.

In the invention described in claim 2, while the existing pipe buried in the ground is crushed by the preceding reamer, the rehabilitation pipe connected to the reamer is drawn into the space where the existing pipe is crushed. A non-open-cut replacement renewal method for renewing, injecting a soil hardening agent that solidifies the broken pieces of the existing pipe together with the soil around the rehabilitation pipe, and a passage provided inside The soil hardening agent supplied through the outer surface is connected to a drill rod that rotationally drives a reamer body in which an injection hole is formed, and the soil is attached to the conical tip of the reamer body. A first injection hole for injecting a hardener is formed, and a second injection hole for injecting the soil hardener is formed in the cylindrical body, and the first and second injection holes are provided. In the reamer passage that communicates From at least one is characterized reamer the valve body to allow ejection soil propellant is provided.

Further, according to the third aspect of the present invention, while the existing pipe buried in the ground is crushed by the preceding reamer, the rehabilitation pipe connected to the reamer is drawn into the space where the existing pipe is crushed. A non-open-cut replacement renewal method for renewing, by injecting a soil hardening agent that solidifies the smashed pieces of the existing pipe together with the soil around the rehabilitation pipe and being connected to the reamer. A rod hole through which a drill rod that gives a rotational driving force is rotatably inserted is provided at substantially the center, and the outer peripheral edge is brought into sliding contact with the inner peripheral surface of the existing pipe to prevent the soil hardening agent from flowing out. It features the excavation replacement renewal method .

Further, according to the fourth aspect of the present invention, while the existing pipe buried in the ground is crushed by the preceding reamer, the rehabilitation pipe connected to the reamer is drawn into the space where the existing pipe is crushed. A non-cutting replacement renewal method of updating,
While injecting a soil hardening agent that solidifies the crushed existing pipe fragments together with the soil around the rehabilitation pipe, the soil hardening agent is mainly composed of liquid cement that solidifies after a certain period of time, A forward end of the rehabilitating pipe is connected to a drill rod that rotationally drives a reamer body in which an injection hole for injecting the soil hardening agent supplied through a passage provided therein is formed from an outer surface. It is characterized by a non-cutting replacement renewal method in which an auxiliary injection hole is formed in which the portion is substantially closed and the soil hardening agent supplied from the rehabilitation pipe is injected .

  When the rehabilitation pipe connected to the reamer is drawn into the portion where the existing pipe is disposed, the existing pipe embedded in the ground is When crushed by the preceding reamer, the injected soil hardening agent causes the broken pieces of the existing pipe to harden together with the soil around the rehabilitated pipe so that it is united around the rehabilitated pipe. Fixed.

  For this reason, since the fragments of existing pipes that have been crushed can be integrally held around the rehabilitation pipe without being dispersed, for example, asbestos pipe fragments may be exposed to the ground and asbestos may be scattered. There is no.

  Further, according to the second aspect of the present invention, since the soil hardener is a liquid cement when the rehabilitated pipe is pulled in while crushing the existing pipe, it has fluidity, and the lubricant Also works.

  For this reason, it is not necessary to separately spray a lubricant, and the injection of liquid cement can be completed simultaneously with the crushing of the existing pipe and the retraction of the renovated pipe, so that the construction becomes easy.

  Further, according to a third aspect of the present invention, the soil hardening agent is injected from an injection hole formed in the outer surface of the reamer main body that rotates as the drill rod rotates.

  For this reason, a soil hardening agent can be supplied to the circumference | surroundings of the reamer main body of a reamer main body, and the rehabilitation pipe | tube connected.

  According to a fourth aspect of the present invention, the first projecting blade projecting from the side surface of the conical tip portion crushes the existing tube by the rotation of the reamer body.

  Next, since the second projecting blade projects outwardly larger than the projecting amount of the first projecting blade, the second projecting blade is expanded so as to have a pipe diameter larger than the pipe diameter formed by the first projecting blade. While making the diameter, the broken pieces of the existing pipe are stirred and mixed in the surrounding soil hardening agent.

  For this reason, with the momentum at the time of crushing by said 1st projection blade, the fragment of the existing pipe stabbed into the surrounding pipe inner wall is scooped with the surrounding soil, and is stirred and mixed in the surrounding soil hardening agent. .

  Therefore, when the soil hardener is hardened, since the fragments of the existing pipe are held in the hardened layer integrally provided around the rehabilitation pipe by the soil hardener, it is exposed in the surrounding soil after construction. The debris can be reduced, and there is no risk that the debris will be exposed and scattered due to an unexpected excavation at a later date.

  Further, according to a fifth aspect of the present invention, the soil hardening agent is ejected from both or at least one of the first ejection hole and the second ejection hole by opening and closing the valve body. be able to.

  Therefore, the injection amount can be appropriately changed according to the soil condition at the construction site, the viscosity of the soil hardener, and the like.

  Further, according to a sixth aspect of the present invention, the outer peripheral edge of the inserted seal packing is slidably contacted with the inner peripheral surface of the existing pipe so that the drill rod is rotatable, and the soil hardening is performed. Unnecessary spillage of the agent is prevented.

  Since the seal packing is independent of the drill rod and does not rotate, the sealability by the outer peripheral edge can be improved, the amount of soil hardening agent lost due to leakage can be suppressed, and the efficiency Is good.

  And what was described in Claim 7 is that the soil hardening | curing agent supplied from the inside of this rehabilitation pipe is ejected from the auxiliary | assistant ejection hole formed in the said cover body, The said reamer, the front-end | tip part of this rehabilitation pipe, The space is filled with the soil hardening agent.

  For this reason, the surroundings of the soil hardening agent around the rehabilitation pipe can be further improved, and a cavity is not generated.

  Next, based on FIG. 1 thru | or FIG. 11, the non-cutting replacement renewal construction method of the best embodiment for implementing this invention, and the reamer and lid used for this construction method are demonstrated.

  First, with reference to FIG. 3, the configuration of a drill device or the like that performs the non-opening replacement update method of this embodiment will be described. The excavator 1 provided with the drill drive device of this embodiment can be rotationally driven. In the passage 3 formed inside the drill rod 2 connected to the feed rod 4, there is provided a feed section 4 comprising a feed pump or the like that feeds liquid cement 5 as a soil hardening agent fed from a feed wheel 6 as shown in FIG. It has been.

  In addition, at the construction site, the start pit 8 and the arrival pit 9 are excavated in the vertical direction to a predetermined depth before and after the existing pipe 7 to be replaced and updated.

  The existing pipe 7 buried in the ground is crushed by the reamer 10 connected to the rotationally driven drill rod 2 and is connected to the reamer 10 via a connecting member 12 a and a wire grip 12. The rehabilitated pipe 11 is configured to be renewed by being drawn into the portion where the existing pipe 7 is disposed.

  And in this embodiment, when the rehabilitation pipe | tube 11 is drawn in in the space where this existing pipe | tube 7 was crushed, the said liquid cement 5 was inject | poured and the fragments 17 ... of the said existing pipe | tube 7 crushed. Along with the soil around the rehabilitation tube 11, the rehabilitation tube 11 is solidified integrally around the rehabilitation tube 11.

  In the non-cutting replacement renewal method of Example 1 of this embodiment shown in FIGS. 1 to 9, the existing pipe 7 is made of nonmetal such as synthetic resin, asbestos, or ceramic, and a plurality of The ends of the existing pipes 7 and 7 having a certain length are connected to each other by a metal joint member 13.

  Further, the rehabilitation pipe 11 is made of a polyethylene resin material, and, as shown in FIG. 1, a lid body 14 that substantially closes the forward end portion 11a is detachably fitted to substantially close the opening. Is provided.

  Furthermore, as shown in FIG. 11, the liquid cement 5 has fluidity by adjusting the viscosity by adding a thickener such as a high molecular weight polymer with a main cement and blast furnace slag as main components, The fixed time during construction functions as a lubricant and is configured to solidify after a fixed time.

  Next, the configuration of the reamer 10 used in the non-opening replacement updating method of the first embodiment will be described.

  As shown in FIG. 1, the reamer 10 according to the first embodiment is provided with a connecting portion 10 a in which a male screw portion 2 a formed at a tip of the drill rod 2 to be rotationally driven is screwed and connected. A reamer main body 10c having a plurality of first injection holes 10d, and second injection holes 10e, through which the liquid cement 5 supplied through the inner reamer passage 10b is injected from the outer surface. is doing.

  The reamer main body 10c is mainly formed in the vicinity of the front end side in the crushing direction in a conical tip portion 10f that is integrally formed continuously from the connecting portion 10a, and a cylinder that is integrally extended from the conical tip portion 10f. It has a certain length dimension so that the central axis extending direction is along the crushing progress direction.

  Among them, a plurality of first projecting blades 10h that crush the existing pipe by the rotation of the reamer main body 10c are projected from the side surface of the conical tip portion 10f.

  Further, a plurality of second projecting blades 10i are projected on the outer surface in the vicinity of the rear end of the cylindrical body portion 10g so as to project outward from the first projecting blades 10h. Has been.

  Then, by this second protruding blade 10i, the large pipeline 19 shown in FIG. 9 has a larger pipeline diameter than the pipeline diameter of the small pipeline 18 formed by the first protruding blade 10h shown in FIG. The diameter can be expanded. At this time, the crushed pieces of the existing pipes 17 are stirred and mixed into the surrounding liquid cement 5 by the second protruding blades 10i together with the soil on the inner wall surface of the small pipe line 18 excavated at the time of diameter expansion. It is comprised so that.

  Furthermore, the second projecting blade 10i of the first embodiment is provided so as to incline at a predetermined angle with respect to the crushing direction from the axial rotation direction on the circumference, and the soil and the liquid cement 5 etc. And the soil and liquid cement 5 and the like are pumped toward the rear side in the crushing direction by the rotation of the reamer body 10c.

  Further, the conical tip portion 10f of the reamer main body 10c is formed with first injection holes 10d for injecting the liquid cement 5, and each of these first injection holes 10d is used for the drill. The liquid cement 5 is connected to the front side of the reamer passage 10b communicated with the passage 3 in the rod 2 through a branch pipe branched into a plurality of radial shapes and supplied from the supply section 4 of the excavator 1. Are formed in a plurality of rows at regular intervals in the circumferential direction so that they can be ejected substantially uniformly around the outside of the conical tip 10f.

  Further, in the cylindrical body portion 10g, second injection holes 10e for injecting the liquid cement 5 are formed in the vicinity of the rear end portion where the second protruding blade 10i is formed.

  Each of these second ejection holes 10e is connected to the rear side of the reamer passage 10b communicated with the passage 3 in the drill rod 2 through branch pipes that are branched in a plurality of substantially radial directions. The liquid cement 5 supplied from the supply unit 4 of the excavator 1 is formed at regular intervals in the circumferential direction so that the liquid cement 5 can be ejected substantially uniformly around the outside of the cylindrical body 10g.

  Further, in the first embodiment, the liquid cement 5 can be ejected from at least one of the in-reamer passages 10b communicating with the first ejection holes 10d and the second ejection holes 10e. Further, a valve body 10j provided with an operation handle 10k that enables switching between opening and closing of the reamer passage 10b is interposed.

  Then, as shown in FIG. 1, when the operation handle 10k of the valve body 10j is turned, the reamer passage 10b is closed, and the liquid cement 5 is injected only from the first ejection hole 10d. In the open state, the liquid cement 5 is ejected from both the first ejection holes 10d and the second ejection holes 10e.

  Further, in the first embodiment, as shown in FIG. 3, a rubber seal packing 15 is provided on a part of the drill rod 2 that gives a rotational driving force by being connected to the reamer 10. .

  The seal packing 15 has a substantially disk shape, and a rod hole 15a through which the drill rod 2 is rotatably inserted is formed at a substantially center, and an outer peripheral edge 15b is formed on the inner peripheral surface of the existing pipe 7. On the other hand, the liquid cement 5 is slidably slidably contacted in the crushing direction so that useless outflow of the liquid cement 5 is prevented.

  Next, the operation of the non-opening replacement updating method according to the first embodiment will be described along the work sequence shown in FIGS.

  In the construction site of the non-open cutting replacement renewal method according to the first embodiment, the start pit 8 and the arrival pit 9 are excavated in the vertical direction to a predetermined depth before and after the existing pipe 7 for replacement replacement.

  Then, as shown in FIG. 4, the carriage 101 of the metal joint exploration system 100 is inserted into the existing pipe 7 from the access pit 9, and the situation of the existing pipe 7 and the metal joint members 13, 13. Identify location and type.

  Next, as shown in FIG. 5, the crushing unit 102 is attached to the tip of the drill rod 2 and is inserted into the existing pipe 7 from the start pit 8 side using the excavator 1.

  At this time, a worker on the ground specifies the position of the joint member 13 using the locator 103 and the television monitor 104 and crushes the joint member 13 from the inside of the existing pipe 7 using the crushing unit 102. .

  Then, as shown in FIG. 6, the connecting portion 10 a of the reamer 10 is screwed and attached to the male screw portion 2 a at the tip of the drill rod 2 in the access shaft 9. The distal end portion 11a in the moving direction of the rehabilitated tube 11 is connected through the connecting member 12a and the wire grip 12.

  In this state, the drill rod 2 connected to the excavator 1 is rotationally driven while the supply unit 4 sends out the liquid cement 5 supplied from the supply vehicle 6.

  While the reamer 10 connected to the drill rod 2 crushes the existing pipe 7, the rehabilitation pipe 11 connected to the reamer 10 via the connecting member 12 a and the wire grip 12 is connected to the reamer 10. It is pulled into the part where it was placed and updated.

  At this time, when the existing pipe 7 buried in the ground is crushed by the preceding reamer 10, the broken pieces 17 of the existing pipe 7 crushed by the injected liquid cement 5 It hardens together with the surrounding soil and is fixed to the outer peripheral surface of the rehabilitation pipe 11 so as to be integrated.

  Therefore, the broken pieces 17 of the existing pipe 7 can be integrally held in the soil around the rehabilitated pipe 11 without being dispersed.

  Further, when the reamer 10 pulls in the rehabilitated pipe 11 while crushing the existing pipe 7, the liquid cement 5 has fluidity and functions as a lubricant.

  For this reason, it is not necessary to separately inject a lubricant as in the prior art, and at the same time as the crushing of the existing pipe 7 and the retraction of the rehabilitation pipe 11, the injection of liquid cement can be completed. Construction is easy because there is no need to open an injection pit from the surface.

  Further, the liquid cement 5 is injected from the first injection holes 10d... And the second injection holes 10e formed in the outer surface of the reamer main body 10c that rotates as the drill rod 2 rotates.

  For this reason, the liquid cement 5 can be supplied substantially evenly around the reamer main body 10c of the reamer 10 and the rehabilitation pipe 11 to be connected without being biased.

  Then, by the rotation of the reamer main body 10c, the first protruding blades 10h projecting from the side surface of the conical tip 10f crush the existing pipe 7 in advance.

  At this time, since the first protruding blades 10h crush the existing tube 7 so as to be pushed and spread from the inner side surface side of the existing tube 7, as shown in FIG. The broken piece 17 of the existing pipe 7 may be substantially fixed.

  In the first embodiment, the second projecting blades 10i in the vicinity of the rear end portion of the cylindrical body portion 10g that proceeds while excavating the inner wall of the small pipe line 18 are directed outward of the first projecting blades 10h. It protrudes larger than the protruding amount.

  For this reason, as shown in FIG. 8, the diameter of the large pipe 19 is increased to be larger than the diameter of the small pipe 18 formed by the first protruding blade 10h. In the liquid cement 5, the broken pieces 17 of the existing pipe 7, which has been unevenly distributed, such as sedimented and deposited by its own weight, are stirred and mixed in the surrounding liquid cement 5.

  Moreover, the fragments 17 and 17 of the existing pipe 7 pierced into the inner wall of the surrounding small pipe line 18 by the moment of crushing by the first projecting blade 10h are scooped together with the surrounding soil, and the inside of the surrounding liquid cement 5 Is mixed with stirring.

  Accordingly, when the liquid cement 5 is hardened, the pieces 17 of the existing pipe 7 are held in the hardened layer integrally provided around the rehabilitated pipe 11 by the liquid cement 5 as shown in FIG. Therefore, after the construction, it is possible to reduce the pieces 17 that protrude from the inner surface of the large pipe line 19 and are exposed in the surrounding soil.

  Furthermore, in the first embodiment, both of the first ejection hole 10d and the second ejection hole 10e or only the first ejection hole 10d are opened and closed by using the operation handle 10k of the valve body 10j. From this, the liquid cement 5 can be ejected.

  Accordingly, the injection amount can be appropriately changed according to the state of the soil at the construction site, the viscosity of the liquid cement 5, and the like.

  For this reason, in the first embodiment, for example, the viscosity of the liquid cement 5 is set to be relatively high to prevent the liquid cement 5 from leaching into the soil around the large pipe line 19, while increasing the ejection amount, Adjustment can be easily performed, for example, suppression of generation.

  Further, an outer peripheral edge 15b of the seal packing 15 inserted through the rod hole 15a is slidably contacted with an inner peripheral surface of the existing pipe 7 so that the drill rod 2 is rotatable. 5. Unnecessary outflow of 5 is prevented.

  Since the seal packing 15 is independent of the drill rod 2 and does not rotate, the sealing performance by the outer peripheral edge can be improved, and the amount of the liquid cement 5 lost due to leakage can be suppressed. .

  Furthermore, in this Example 1, the said 2nd projection blade 10i is protrudingly provided so that it may incline at a predetermined angle with respect to the crushing progress direction from the axial rotation direction on the circumference, and the said soil and liquid cement 5 and the like, and the rotation of the reamer main body 10c causes the soil and the liquid cement 5 to be pumped toward the rear side in the crushing direction.

  For this reason, the mixed liquid material of the liquid cement 5 in which the surrounding soil including the fragments 17 is mixed is replenished with the liquid cement 5 ejected from the second ejection hole 10e, while the diameter of the expanded large pipe 19 is increased. It is filled with pressure without any gap inside.

  Therefore, as shown in FIGS. 7 and 9, it is possible to reduce the possibility that cavities are generated in the hardened layer after the liquid cement 5 is hardened.

  Therefore, for example, even if the existing pipe 7 is made of asbestos or the like, the liquid cement 5 is hardened in the hardened layer after being hardened so that the broken pieces 17 are exposed and contact with the soil is reduced. It is possible to hold the broken pieces 17 and to reliably prevent dispersion into the ground.

  Moreover, there is no risk of asbestos scattering due to the asbestos pipe exposed to the ground due to an unexpected excavation at a later date.

  Moreover, in the first embodiment, the second protruding blade 10i is provided on the outer surface near the rear end portion of the cylindrical body portion 10g, and the first protruding blade 10h is formed in the conical tip portion 10f. To a certain distance from each other.

  For this reason, when the drill rod 2 is driven to rotate while being driven to rotate in the direction of the start hole 8, there is little possibility that the rear end portion of the cylindrical body portion 10g swings in the outer diameter direction. Tracing can be performed from substantially the same distance from the rear of the conical tip 10f.

  Accordingly, the shape of the hardened cement layer after hardening can be made linear, and the construction efficiency is also good.

  FIG. 10 shows a lid 20 used in the non-cutting replacement updating method according to Example 2 of the embodiment of the present invention.

  In addition, the same code | symbol is attached | subjected and demonstrated about the same thru | or equivalent part as the said embodiment and Example 1. FIG.

  In the lid 20 used in the non-cutting replacement renewal method of the second embodiment, a plurality of auxiliary ejection holes 22, 22 are formed in a substantially disc-shaped lid body 20 a that substantially closes the distal end portion 11 a of the rehabilitation pipe 11. However, an opening is formed.

  Branch pipes 21 a and 21 a of a supply pipe 21 provided with a passage for the liquid cement 5 extending in the rehabilitation pipe 11 are connected to the auxiliary ejection holes 22 and 22, respectively. It is comprised so that the liquid cement 5 supplied from may be ejected.

  Next, the function and effect of the lid 20 used in the non-cutting replacement updating method of the second embodiment will be described.

  In the lid body 20 of the second embodiment, in addition to the operational effects of the first embodiment, the auxiliary ejection holes 22 and 22 formed in the lid body 20 further extend into the rehabilitation pipe 11. The liquid cement 5 supplied from the supply pipe 21 provided with a passage for the cement 5 is ejected, and the liquid cement 5 forms a gap between the rear end portion of the reamer 10 and the front end portion 11a of the rehabilitation pipe 11. Filled.

  For this reason, the surrounding soil containing the debris 17 adhering to the upper inner wall surface of the large pipe 19 is mixed in a cavity generated in the vicinity of the rear end portion with the movement of the reamer 10 in the crushing direction. The possibility that the mixed liquid material of the liquid cement 5 peeled off and dropped is reduced, and the layer closest to the outer peripheral surface of the rehabilitated pipe 11 among the hardened layers positioned around the rehabilitated pipe 11 is further mixed. As a cement layer with a small amount, the surroundings around the rehabilitation pipe 11 can be made even better.

  The blending ratio of the liquid cement 5 supplied from the start pit 8 side and the blending ratio of the liquid cement 5 ejected from the auxiliary ejection holes 22 and 22 are different from each other, and the viscosity and the setting time are adjusted. Thus, non-open cutting replacement renewal construction adapted to various conditions such as soil conditions at the construction site can be performed.

  The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are not limited to this embodiment. Included in the invention.

  That is, in the embodiment and Example 1, the shape of the second protruding blade 10i provided on the reamer 10 is inclined at a predetermined angle with respect to the crushing direction from the axial rotation direction on the circumference. However, the present invention is not limited to this. For example, the first projecting blade 10h and the second projecting blade 10i may have any shape, for example, a square shape, a round bar shape, or the like is randomly arranged. , Quantity, and array.

  In the embodiment and the first embodiment, the reamer main body 10c in which a plurality of first injection holes 10d and second injection holes 10e to be injected from the outer surface are formed has been described. The number, shape, and arrangement of the first injection holes 10d, and the second injection holes 10e.

It is a perspective view which shows the reamer used for the non-cutting replacement update method of Example 1 of embodiment of this invention, and demonstrates the principal part. It is the underground longitudinal cross-sectional view explaining a mode that a reamer injects a soil hardening agent, crushing an existing pipe | tube by the non-open cutting replacement renewal construction method of Example 1 of embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cross-sectional perspective view illustrating an overall configuration in a non-open cutting replacement renewal method according to Example 1 of an embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is the typical underground longitudinal cross-sectional view explaining the non-cutting replacement renewal construction method of Example 1 of embodiment of this invention, and a mode that a joint member is explored. BRIEF DESCRIPTION OF THE DRAWINGS It is the typical underground longitudinal cross-sectional view explaining a mode of crushing a joint member by demonstrating the non-open cutting replacement update method of Example 1 of embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic vertical cross-sectional view illustrating the non-cut-replacement replacement renewal method of Example 1 according to an embodiment of the present invention and illustrating how a rehabilitated pipe is drawn. BRIEF DESCRIPTION OF THE DRAWINGS It is the typical underground longitudinal cross-sectional view explaining a non-cutting replacement renewal construction method of Example 1 of an embodiment of the invention, and explaining that a rehabilitation pipe was drawn in and construction was almost completed. It is the underground vertical sectional view which shows distribution of the fragment crushed by the 1st projection blade shown as a comparative example of the non-cutting substitution renewal construction method of Example 1 of an embodiment of the invention. It is the underground vertical sectional view which shows the non-cutting replacement update method of Example 1 of embodiment of this invention, and shows distribution of the fragment stirred by the 2nd projection blade. It is the underground longitudinal cross-sectional view explaining a mode that a soil hardening | curing agent is injected from the cover body of a rehabilitation pipe | tube by the non-open cutting replacement renewal construction method of Example 2 of embodiment of this invention. It is a table | surface figure which shows an example of the mixing | blending of the liquid cement as a soil hardening agent used for embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Excavator 2 Drill rod 3 Passage 4 Supply part 5 Liquid cement (soil hardening agent)
7 Existing pipe 10 Reamer 10b Reamer passage 10c Reamer body 10d First injection hole 10e Second injection hole 10f Conical tip 10g Cylindrical body 11 Rehabilitation pipe 15 Seal packing 15a Rod hole 15b Outer edge 18 Small pipe 19 Large pipe Road 20 Lid 22 Auxiliary ejection hole

Claims (4)

A non-cutting replacement renewal method of renewing a renewal pipe connected to the reamer by drawing it into the space where the existing pipe was crushed while crushing the existing pipe buried in the ground with a preceding reamer,
Fragments of the crushed existing pipe, with the soil, The rewritable injected soil hardening agent to solidify integrally around the further production tube, the soil hardening agent as a main component a liquid cement which solidifies after a predetermined time has elapsed A reamer main body having an injection hole for injecting the soil hardening agent supplied through a passage provided therein from an outer surface, the reamer main body being connected to a drill rod that is driven to rotate. A conical tip formed in the vicinity of the tip of the reamer body in the crushing direction and a cylindrical body integrally extending from the conical tip, and projecting from the side of the conical tip. A first projecting blade that crushes the existing pipe by rotation of the reamer main body, and is provided on the outer surface of the cylindrical body, and projects outward beyond the projecting amount of the first projecting blade. By the first protrusion blade. Than the conduit diameter formed Te, while expanded so that the large pipe diameter, the pieces of crushed existing pipe, that is provided and a second protrusion edge to be stirred and mixed into the surrounding soil hardening agent Characteristic non-cutting replacement renewal method. A non-cutting replacement renewal method of renewing a renewal pipe connected to the reamer by drawing it into the space where the existing pipe was crushed while crushing the existing pipe buried in the ground with a preceding reamer,
Injecting a soil hardening agent that solidifies the crushed pieces of the existing pipe together with the soil around the rehabilitation pipe, and removing the soil hardening agent supplied through a passage provided inside the outer pipe. A reamer main body having an injection hole to be injected from a side surface is connected to a drill rod that rotates , and a first injection hole for injecting the soil hardening agent is formed at the conical tip of the reamer main body. In addition, a second injection hole for injecting the soil hardening agent is formed in the cylindrical body, and at least one of the passages in the reamer that communicates the first injection hole and the second injection hole. A reamer characterized in that a valve body capable of ejecting a soil ejection agent is provided from one side. A non-cutting replacement renewal method of renewing a renewal pipe connected to the reamer by drawing it into the space where the existing pipe was crushed while crushing the existing pipe buried in the ground with a preceding reamer,
  Injecting a soil hardening agent to solidify the crushed pieces of the existing pipe together with the soil around the rehabilitation pipe, and by connecting with the reamer, the drill rod that gives rotational driving force is rotatable. A non-cutting replacement renewal method characterized in that a rod hole that is inserted through is provided at substantially the center, and the outer peripheral edge is brought into sliding contact with the inner peripheral surface of the existing pipe to prevent the soil hardener from flowing out. A non-cutting replacement renewal method of renewing a renewal pipe connected to the reamer by drawing it into the space where the existing pipe was crushed while crushing the existing pipe buried in the ground with a preceding reamer,
  While injecting a soil hardening agent that solidifies the crushed existing pipe fragments together with the soil around the rehabilitation pipe, the soil hardening agent is mainly composed of liquid cement that solidifies after a certain period of time, A forward end of the rehabilitating pipe is connected to a drill rod that rotationally drives a reamer body in which an injection hole for injecting the soil hardening agent supplied through a passage provided therein is formed from an outer surface. A non-cutting replacement renewal method characterized in that an auxiliary injection hole for substantially closing the portion and ejecting the soil hardening agent supplied from the inside of the rehabilitation pipe is formed.

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