WO2011111474A1 - Continuous steel wall and method for constructing same - Google Patents

Abstract

Disclosed are a continuous steel wall and a construction method therefor whereby steel sheet piles and stiffeners can reliably be put in contact with each other even if the steel sheet piles and stiffeners are driven into the ground separately. In said construction method, a first guide member (24) that fits around an H-shaped steel stiffener (3) is provided at the bottom end of a steel sheet pile (2) so as to be able to move in the long direction of the H-shaped steel stiffener (3). Also, a second guide member (33) is provided at the bottom end of the H-shaped steel stiffener (3) so as to be able to move in the long direction of another steel sheet pile (2a), driven in prior to and next to the steel sheet pile (2) that the H-shaped steel stiffener (3) contacts. By fitting around the previously-driven steel sheet pile (2a), the second guide member (33) fixes the position of the H-shaped steel stiffener (3) with respect to the previously-driven steel sheet pile (2a). By having the second guide member (33) fit around the previously-driven steel sheet pile (2a), the H-shaped steel stiffener (3) can be driven into the ground positioned and guided by the previously-driven steel sheet pile (2a). Next, the first guide member (24) is fitted around the already-driven H-shaped steel stiffener (3), allowing the next steel sheet pile (2) to be driven into the ground guided by the H-shaped steel stiffener (3).

Description

Steel continuous wall construction method and steel continuous wall

The present invention relates to a steel wall with steel sheet piles used for retaining walls, such as earth retaining walls, underground structure walls, river and harbor revetments and quay walls, road works, etc. It is related with the construction method of a continuous wall and steel continuous walls.

In the field of civil engineering and construction, steel sheet piles are generally used as steel materials for underground walls used for earth retaining walls, river revetments, road retaining walls, etc. to prevent the collapse of earth and sand. For this steel sheet pile, straight steel sheet pile, U-shaped steel sheet pile, Z-shaped steel sheet pile, hat-shaped steel sheet pile, box-shaped steel sheet pile (two U-shaped steel sheet piles are integrated into a box shape by welding), etc. There are different types. In order to improve the cross-sectional performance of the wall body in which this steel sheet pile is connected to such a steel sheet pile, there is known a combined steel sheet pile integrated by full length welding of a stiffener such as H-section steel or CT steel. Yes.

Although this combined steel sheet pile has excellent cross-sectional performance, it is difficult to stack a large number of combined steel sheet piles on a vehicle at the time of transportation because it is complicated and cannot be stacked compactly and is bulky. Thus, there are problems such as high transportation costs.
Therefore, from the viewpoint of emphasizing the convenience of transportation, there is also a method in which the steel sheet pile and the supplementary steel material are transported separately to the construction site and integrated on the site. However, since work such as full length welding is difficult at the construction site, it is difficult to integrate such that a large cross-sectional performance can be obtained. It may also be necessary to correct the thermal distortion of the steel sheet pile due to full length welding.

On the other hand, even if the steel sheet pile and the stiffener are not completely integrated by full length welding, etc., if the steel sheet pile and the stiffener behave like a so-called overlapped beam, it is compared with the case of only the steel sheet pile. As a result, the cross-sectional performance is improved. In order to function in this way, the steel sheet pile placed on the ground and the stiffener must be substantially in contact.

As such a steel sheet pile wall, an underground continuous wall having a structure in which a steel sheet pile web and an H-shaped steel flange are restrained only at one end on the ground side has been proposed (for example, see Patent Document 1). As an example of the construction method of this underground continuous wall, in order to prevent the steel sheet pile web and the H-shaped steel flange from separating in the ground during the installation process, the steel sheet pile web and the H-shaped steel flange It has been proposed to temporarily fix one end on the ground side opposite to one end on the ground side.

In addition, a structure has been proposed in which a fitting member (angle, guide) is provided on one side of a steel sheet pile and fitted to a flange of an H-shaped steel that is a reinforcing steel material (stiffening material) (for example, Patent Documents 2 and 3). reference).
In patent document 2, a fitting member is provided in the steel sheet pile full length, and it builds in the state in which the steel sheet pile and the H-shaped steel were fitted. In patent document 3, a fitting member is provided only on the steel sheet pile full length (may be discontinuous) or only at the upper end, and after placing the steel sheet pile first, a method of placing H-shaped steel using the fitting member as a guide. Has been proposed.

JP 2008-267069 A Japanese Examined Patent Publication No. 2-57163 JP 2005-299202 A

However, since steel sheet piles generally have a length exceeding 10 m in many cases, the temporary fixing of only the upper and lower ends of the steel sheet piles as shown in Patent Document 1 can be used when temporarily suspending and lowering to a predetermined position. There is a high possibility of breakage and deformation of the stopper, and there is a risk that the steel sheet pile and the H-shaped steel will be separated when placing on the ground. Therefore, it is necessary to integrate the upper and lower ends of the steel sheet pile and the H-shaped steel as well as temporary fixing, resulting in increased processing costs and the same problems as in the case of full length welding described above. It is possible.

Moreover, in the steel sheet pile wall shown by patent document 2, 3, providing a guide member in full length is large disadvantageous in terms of cost, such as material and a process.
In Patent Document 3, a steel sheet pile is driven into the ground first, and then guided to a fitting member provided on the steel sheet pile to drive H-shaped steel. Although there is a merit that the construction machine can be used, when the guide member is provided on the entire length, there is a problem in cost as described above. In addition, when the fitting member is provided only at the upper end of the steel sheet pile, it cannot be confirmed whether the steel materials are in contact with each other in the underground portion, and it is necessary if the steel sheet pile and the H-shaped steel are separated. The cross-sectional performance cannot be demonstrated.

The present invention separately separates the steel sheet pile and the stiffener from the ground without welding the steel sheet pile and the stiffener full length and without providing a fitting member over the entire length of the steel sheet pile or stiffener An object of the present invention is to provide a steel continuous wall construction method and a steel continuous wall that can reliably bring the steel sheet pile and the stiffener into contact with each other even when the steel sheet is placed.

In order to solve the above-mentioned problem, the construction method of the continuous steel wall according to claim 1 is longitudinal in the longitudinal direction of the steel sheet pile on at least one surface side of a wall body formed by connecting steel sheet piles. A steel continuous wall construction method comprising a long stiffener in contact with the steel sheet pile along the direction, and fitted to the stiffener in contact with the steel sheet pile at the lower end of the steel sheet pile. The steel sheet pile is provided with a first guide member that can move along the longitudinal direction of the stiffener, and the lower end of the stiffener is adjacent to the steel sheet pile in contact with the stiffener. A second guide member is provided that is fitted to an existing steel sheet pile placed on the steel sheet and is capable of moving the stiffener along the longitudinal direction of the existing steel sheet pile, and the stiffener is connected to the existing steel sheet. The second guide member is fitted to the sheet pile, and the existing steel sheet pile is positioned and guided. Then, the steel sheet pile is connected to the existing steel sheet pile, and the first guide member is fitted to the previously stiffened stiffener and guided to the stiffener. It is characterized in that it is placed on the ground.

The construction method of the continuous wall made of steel according to claim 2 is the invention according to claim 1, wherein the steel sheet pile includes joints respectively connected to left and right steel sheet piles, and a cross section of the second guide member. The shape is the same as a cross-sectional shape of the steel sheet pile or a partial cross-sectional shape having at least one joint portion of the cross-sectional shape of the steel sheet pile, and corresponds to the steel sheet pile joint of the second guide member. The portion to be fitted is fitted to the joint of the existing steel sheet pile.

The construction method of the steel continuous wall according to claim 3 is the invention according to claim 1 or claim 2, wherein the second guide is fitted to the existing steel sheet pile when the stiffener is placed. Before the member is detached from the lower end of the existing steel sheet pile, the placement of the stiffener is terminated.

The construction method of the steel continuous wall according to claim 4 is the invention according to claim 1, wherein the lower end of the steel sheet pile contacts the second guide member of the stiffener when the steel sheet pile is driven. By pushing the second guide member down, the steel sheet pile is driven on the ground until the stiffener moves down.

The steel continuous wall according to claim 5 is a length in contact with the steel sheet pile along the longitudinal direction of the steel sheet pile on at least one surface side of the wall body formed by connecting the steel sheet piles. It is a steel continuous wall provided with a scale stiffener, and is fitted to the stiffener in contact with the steel sheet pile at the lower end of the steel sheet pile when the steel sheet pile is placed, and the steel sheet pile is A first guide member is provided that is movable along the longitudinal direction of the stiffener, and is adjacent to the steel sheet pile in contact with the stiffener at the lower end of the stiffener. The position of the stiffener relative to the existing steel sheet pile by being fitted to the existing steel sheet pile previously placed and allowing the stiffener to move along the longitudinal direction of the existing steel sheet pile. A second guide member for determining the above is provided.

The continuous steel wall according to claim 6 is the invention according to claim 5, wherein the steel sheet pile includes joints respectively connected to the left and right adjacent steel sheet piles, and the cross-sectional shape of the second guide member is the steel. The cross-sectional shape of the sheet pile or the cross-sectional shape of the steel sheet pile is formed to be the same as a partial cross-sectional shape having at least one joint portion.

In the inventions according to claim 1 and claim 5, the stiffener is placed prior to the steel sheet pile contacting the stiffener, and the stiffener fits the second guide member to the existing steel sheet pile. In this state, it is driven at a predetermined position while being guided by the existing steel sheet pile. Subsequently, since the steel sheet pile is driven while being guided by the stiffener in a state where the first guide member is fitted to the stiffener thus placed, the lower end of the steel sheet pile during the placement. The part is always in contact with the stiffener. Therefore, if the steel sheet pile and the stiffener previously placed are in contact with each other until the placement is completed on the ground side, stiffening is performed over the entire length of the stiffener and steel sheet pile. The material and the steel sheet pile are substantially in contact. The steel sheet pile includes a joint for connecting the steel sheet piles, and is placed on the ground in a state where the joint is connected to the joint of the existing steel sheet pile.

Moreover, since the steel sheet pile and the stiffener are driven separately, it becomes possible to store and transport the steel sheet pile and the stiffener separately in a compact manner. Thereby, compared with the case where the steel sheet pile and the stiffener are integrally formed and then stored and transported in a bulky state, the distribution cost can be reduced.
The stiffener may be selected appropriately according to the required cross-sectional performance, and can be selected from various shapes such as H-section steel, and has a joint that can be engaged with the guide member. Can be used, and the degree of freedom in design is great.

Note that the second guide member and the first guide member can be attached to the stiffener and the steel sheet pile, for example, by welding or bolt joining, as long as sufficient strength can be secured. Alternatively, it may be performed at a factory or the like. Therefore, a joining method can be selected according to the construction environment. For example, in a construction environment where welding is difficult, bolt joining can be selected. Even in places where there are restrictions on the sky, such as under the bridge girder, the joining method can be selected according to the situation.

In the invention according to claim 2 and claim 6, since the cross-sectional shape of the second guide member is formed to be the same as the cross-sectional shape of the steel sheet pile or a partial cross-sectional shape including one joint portion of the steel sheet pile. The position of the stiffener can be correctly determined by driving the stiffener with the portion corresponding to the joint of the steel sheet pile of the second guide member fitted to the joint of the existing steel sheet pile. At this time, the position where the stiffener of the second guide member having the same or part of the same cross-sectional shape as the steel sheet pile is attached is the same position as the position where the stiffener of the cross-sectional shape of the steel sheet pile contacts. .

Moreover, what cut | disconnected the steel sheet pile short to the longitudinal direction can be used as a 2nd guide member provided in the lower end part of a stiffener.
Further, since the second guide member only needs to be fitted to the joint of the existing steel sheet pile, the joint portion to be fitted to the joint of the existing steel sheet pile from the portion where the stiffener is attached in the cross-sectional shape of the entire steel sheet pile. The cross-sectional shape obtained by cutting the other joint side sufficiently functions as the second guide member. In addition, by making the cross-sectional shape of the second guide member a partial cross-sectional shape of the cross-sectional shape of the steel sheet pile in this way, when transporting with the second guide member attached to the stiffener The stiffeners can be arranged in a more compact manner.

In the invention according to claim 3, when the stiffener is placed, if the second guide member is detached from the existing steel sheet pile, the stiffener may be displaced from the optimum position. The second guide member is preferably not detached from the existing steel sheet pile even when the stiffening material is placed. The stiffener can be positioned with high accuracy by ending the placement of the stiffener before the second guide member moves downward from the lower end of the existing steel sheet pile.

It should be noted that the second guide member is the lower end of the steel sheet pile or its length from the length of the steel sheet pile, the length of the stiffener, the attachment position of the second guide member to the stiffener, and the vertical width of the second guide member. The value of the difference in height between the upper end of the steel sheet pile and the upper end of the stiffener when it falls off can be determined. Therefore, the second guide member is moved downward from the steel sheet pile by finishing the placement of the stiffener before the difference in height between the upper end of the steel sheet pile and the upper end of the stiffener becomes the determined value. It can be prevented from coming off.

In the invention according to claim 4, when the steel sheet pile is driven in a state where the first guide member of the steel sheet pile is correctly fitted to the stiffener, the steel sheet pile is at the lower end of the stiffener at the end of the steel sheet pile driving. The second guide member hits the second guide member provided in the section and is pushed down. As a result, the stiffener moves downward. When viewed from the ground side, the upper end of the stiffener will be confirmed to sink slightly.
Therefore, by placing the steel sheet pile until the upper end of the stiffener sinks slightly, the first guide member of the steel sheet pile is detached from the stiffener, or the first guide member is detached from the steel sheet pile, It can be confirmed whether the lower end side of the steel sheet pile is not separated from the stiffener.

According to the present invention, without welding a steel sheet pile and a stiffener by full length welding or the like, and without providing a fitting member for fitting the steel sheet pile and the stiffener over substantially the entire length, Even if the sheet pile and the stiffener are separately placed on the ground, the cross-sectional performance can be reliably improved with the steel sheet pile and the stiffener substantially in contact with each other.

It is a figure for demonstrating the construction method of the steel continuous wall and steel continuous wall which concern on embodiment of this invention. (A), (b), (c) is a schematic plan view which shows the modification of the 1st guide member in the said steel continuous wall, respectively. (A), (b) is a schematic plan view which shows the modification of the stiffener in the said steel continuous wall, respectively. (A), (b), (c) is a schematic plan view which shows the modification of the steel sheet pile in the said steel continuous wall, respectively. (A) is a schematic plan view of the said steel continuous wall shown in FIG. 1, (b) is a schematic plan view which shows the modification of the said steel continuous wall.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The steel continuous wall 1 shown in FIG. 1 has a structure in which the steel sheet pile 2 and the H-shaped steel 3 are brought into contact with each other without integrally joining the hat-shaped steel sheet pile 2 and the H-shaped steel 3 as the stiffener. It is.

As is well known, the hat-shaped steel sheet pile 2 includes a web 21, a flange 22 that is provided obliquely from the left and right ends of the web 21 so that the distal ends of the web 21 spread from each other, and the web 21 from the front end of each flange 22. An arm 23 extending in parallel and a joint (not shown) provided at the tip of the arm 23 are provided. The joint is, for example, a well-known joint, and has a shape that is curved and folded back to the inner peripheral side with an interval. In addition, the direction of folding back by the left and right joints is reversed, and the joints in opposite directions are fitted to each other.
The steel sheet pile 2 includes a first guide member 24 at its lower end. The first guide member 24 is fitted into a flange 32 (to be described later) of the H-section steel 3 as a stiffener.

The first guide member 24 is combined with the first guide member 24 and the web 21 so as to form a substantially plate-like space in which the flange 32 of the H-section steel 3 can be inserted between the web 21 of the steel sheet pile 2. In addition to the rectangular frame structure, the first guide member 24 is provided with a slit through which the web 31 of the H-section steel 3 can be inserted.
The first guide member 24 is composed of a pair of right and left angle members (L-shaped steel) 24a having an L-shaped cross section. The first guide member 24 is provided at the lower end of the side surface on the valley side of the web 21 of the steel sheet pile 2. That is, in the first guide member 24, one flat plate portion of the two flat plate portions constituting each angle member 24a is arranged at right angles to the web 21 and joined (welded) to the web 21, and the other The flat plate portion is arranged in parallel with the web 21 and the other flat plate portions are arranged so as to face each other with a gap therebetween.

Between the other flat plate portion of the two angle members 24a of the first guide member 24 and the web 21 of the steel sheet pile 2, the flange 32 of the H-section steel 3 is disposed so as to substantially contact the web 21, and the angle member The web 31 of the H-section steel 3 is arranged between the other flat plate portions of 24a. The vertical width of the first guide member 24 is considerably shorter than the vertical length of the steel sheet pile 2. Further, the first guide member 24 is fitted to one flange 32 of the H-section steel 3 so as to be movable up and down, and the first guide member 24 of the H-section steel 3 on which the first guide member 24 has already been placed. When the steel sheet pile 2 is driven in a state of being fitted to the flange 32, the first guide member 24 is guided to the flange 32 of the H-section steel 3.

As described above, the pair of angle members 24a constituting the first guide member 24 can be attached, for example, by welding. In addition to this, for example, a portion that becomes a flange is provided on the angle member 24a to become a flange. May be fastened and fixed to the web 21 with bolts. When using bolts, the first guide member 24 and the flange 32 of the H-shaped steel 3 are not fitted, and the vertical movement in the fitted state is not obstructed.

As is well known, the H-section steel 3 serving as a stiffener includes a web 31 and flanges 32 provided at both ends of the web 31 so as to be orthogonal to the web 31. The H-shaped steel 3 is configured to substantially come into surface contact with the web 21 of the steel sheet pile 2 with one flange 32 engaged with the guide member 24 of the steel sheet pile 2.
A second guide member 33 that is adjacent to the steel sheet pile 2 in contact with the H-section steel 3 and that fits into the existing steel sheet pile 2 a that is the steel sheet pile 2 that has been previously placed is provided at the lower end of the H-section steel 3. ing.

The second guide member 33 is made by processing the same steel sheet pile 2 as the steel sheet pile 2 and cuts the steel sheet pile 2 short and cuts at the boundary between the web 21 and the flange 22 on one side. . That is, the second guide member 33 includes the web 21 in the cross-sectional shape of the steel sheet pile 2, one flange 22, an arm 23 provided at the tip of the flange 22, and a joint provided at the tip of the arm 23. However, the other flange 22, the other arm 23 and the other joint are not provided. The vertical width of the second guide member 33 is considerably shorter than the length of the H-section steel 3. The second guide member 33 and the flange 32 of the H-shaped steel 3 are fixed by a known means such as welding or bolting.

Next, while explaining the construction method of the steel continuous wall 1 which consists of the steel sheet pile 2 provided with the above 1st guide members 24 and the H-section steel 3 as a stiffener provided with the 2nd guide member 33. FIG. The steel continuous wall 1 constructed by the construction method will be described.
In the construction of the steel continuous wall 1, first, one steel sheet pile 2 is placed.
Here, with respect to the steel sheet pile 2 to be cast from now on or the steel sheet pile 2 being cast, the steel sheet pile 2 which is adjacent to the steel sheet pile 2 before or during placement and has already been cast on the ground. In order to distinguish 2, the cast steel sheet pile 2 is referred to as an existing steel sheet pile for the sake of convenience, and its reference numeral is 2a.
Next, as shown in FIG. 1 (a), in a state where the joint at the tip of the arm 23 of the second guide member 33 is fitted to the joint at the tip of one arm 23 of the existing steel sheet pile 2a, Shape steel 3 is cast.
The steel sheet pile 2 and the H-shaped steel 3 can be placed by using various well-known methods such as hitting, press-fitting, and press-fitting vibration.

As shown in FIG. 1B, in the state where the upper end of the joint of the second guide member 33 is fitted to the lower end of one joint of the existing steel sheet pile 2a, Finish the installation. At this time, since the part except the upper end part of the 2nd guide member 33 will come to a position lower than the lower end of the existing steel sheet pile 2a, when match | combining the height of the upper end of the steel sheet pile 2a and the H-section steel 3, It is necessary to make the length of the H-shaped steel 3 longer than the length of the steel sheet pile 2 a by about the vertical width of the second guide member 33.

In this case, the joint of the steel sheet pile 2a is stopped by stopping the placing of the H-section steel 3 in a state where the height of the upper end of the H-section steel 3 is slightly higher than the height of the upper end of the steel sheet pile 2a. Therefore, the placement of the H-section steel 3 can be finished before the joint of the second guide member 33 is released downward.
Thereby, while the H-section steel 3 is being driven, the second guide member 33 of the H-section steel 3 is fitted to the existing steel sheet pile 2a, and the state in which the H-section steel 3 is positioned. The H-section steel 3 and the existing steel sheet pile 2a are maintained in a parallel state.

In addition, even if the 2nd guide member 33 becomes lower than the existing steel sheet pile 2a and these fitting was cancelled | released, if the H-section steel 3 is further driven, the lower part of the H-section steel 3 May shift and the H-section steel 3 and the existing steel sheet pile 2a may be separated from or approaching a predetermined distance. In this case, as will be described later, it is difficult to drive the steel sheet pile 2 to be driven to the end while being fitted to both the joint of the existing steel sheet pile 2a and the flange 32 of the H-shaped steel 3. There is a risk of becoming.

Next, as shown in FIG. 1C, a steel sheet pile 2 is placed. That is, the first guide member 24 at the lower end of the steel sheet pile 2 is in a state in which one flange 32 of the H-section steel 3 previously placed as described above is fitted, and the existing steel sheet pile 2 a The steel sheet pile 2 is driven in a state where the joint of the steel sheet pile 2 is fitted to one joint. As a result, the steel sheet pile 2 is placed on the ground while being guided by the H-shaped steel 3 and the existing steel sheet pile 2a that have been previously placed.
Note that some deviation between the existing steel sheet pile 2 a and the H-section steel 3 is absorbed by the play of the first guide member 24.
If the H-section steel 3 and the steel sheet pile 2 are in contact with each other on the ground side during the placement of the steel sheet pile 2, the lower end portion of the steel sheet pile 2 contacts the H-section steel 3 by the first guide member 24. Since the steel sheet pile 2 and the H-section steel 3 are in contact with each other, the steel sheet pile 2 is driven.

In this way, the placement of the steel sheet pile 2 is completed as shown in FIG.
At this time, since the existing steel sheet pile 2a and the steel sheet pile 2 are usually the same in length, when the heights of these upper ends are the same, the height positions of the lower ends of the existing steel sheet pile 2a and the steel sheet pile 2 are also the same. It becomes.

In a state just before the completion of placing, as described above, the second guide member 33 of the H-section steel 3 is fitted in the lower end portion of the existing steel sheet pile 2a. The position of the upper end is slightly higher than the lower end of the existing steel sheet pile 2a. Therefore, when the steel sheet pile 2 is driven until the upper end of the steel sheet pile 2 becomes the same height as the upper end of the existing steel sheet pile 2a, the lower end of the steel sheet pile 2 hits the second guide member 33, and the second guide member 33 is slightly lowered. Will be pressed.

When the second guide member 33 is pushed downward and moved, the H-section steel 3 to which the second guide member 33 is fixed also moves slightly downward. At this time, it is confirmed that the upper end portion of the H-section steel 3 slightly sinks on the ground side. If it does so, it can be estimated that the steel sheet pile 2 was driven in the state which the 1st guide member 24 of the lower end part of the steel sheet pile 2 was fitted to the H-section steel to the last.
If the lower end of the steel sheet pile 2 is separated from the H-shaped steel 3 due to damage to the guide member 33 or detachment from the steel sheet pile 2 in the middle of the placement, the lower end of the steel sheet pile 2 becomes the second guide member. Even if the upper end of the steel sheet pile 2 becomes the same height as the upper end of the existing steel sheet pile 2a without hitting 33, it becomes possible to know that there is a problem in construction because the upper end of the H-section steel 3 does not sink. . As a result, it is possible to cope with re-installation or reinforcement of the steel sheet pile 2.

In addition, if the length of the steel sheet pile 2 is the same as the existing steel sheet pile 2a when the 2nd guide member 33 is pushed below, the 2nd guide member 33 will just remove | deviate from the existing steel sheet pile 2a. In this case, since the placement of the steel sheet pile 2 has already been completed and the first guide member 24 at the lower end portion of the steel sheet pile 2 has been fitted into the lower end portion of the H-section steel 3, the second guide member is A problem does not occur even if it is detached from the existing steel sheet pile 2a.

The steel sheet pile 2 placed in this way becomes the existing steel sheet pile 2a, and the next H-section steel 3 and the steel sheet pile 2 are placed on the existing steel sheet pile 2a as described above, and this is repeated. The steel continuous wall 1 is constructed as a laminated beam type sheet pile wall in which the steel sheet piles 2 in contact with the H-section steel 3 are connected, and the steel continuous wall 1 is provided to the set length. The construction of the continuous wall 1 is completed.
The steel continuous wall 1 constructed in this way is in a state in which the H-section steel 3 is in contact with the side surface that becomes the valley side of the steel sheet piles 2 that are connected, for example, as shown in FIG. Has been placed. The one flange 32 of the H-section steel 3 is substantially in contact with one surface of the web 21 of the steel sheet pile 2, and the first guide member 24 at the lower end of the steel sheet pile 2 is in the state of the flange 32 of the H-section steel 3. Although fitted to the lower end, the steel sheet pile 2 and the H-shaped steel 3 are not joined or fitted in other portions.

Moreover, even if the H-section steel 3 that contacts the steel sheet pile 2 is driven prior to the steel sheet pile 2, the H-section steel 3 is made of the steel sheet pile 2 by the second guide member 33 with respect to the existing steel sheet pile 2 a. In a state where it is arranged at a correct position corresponding to the placement position, it is placed in parallel with the existing steel sheet pile 2.

In this state, the steel sheet pile 2 is fitted to the joint of the existing steel sheet pile 2a and the first guide member 24 is fitted to the H-shaped steel 3 so that the steel sheet pile 2 is guided by these. Can be placed. At this time, since the H-section steel 3 is driven in the correct position in parallel with the existing steel sheet pile 2a as described above, the steel sheet pile 2 can be driven in the correct position.
Moreover, since the steel sheet pile 2 and the H-shaped steel 3 are placed in contact with each other, the steel sheet pile 2 and the H-shaped steel 3 function as a laminated beam, and the steel continuous wall 1 with improved cross-sectional performance is provided. Can be obtained.

Moreover, since the steel sheet pile 2 and the H-shaped steel 3 are driven separately, the resistance from the ground is smaller than that when the steel sheet pile 2 and the H-shaped steel 3 are integrated, and the driving force is small. Since the steel sheet pile 2 and the H-shaped steel 3 can be driven, it is possible to drive with a driving machine having a small output, and the equipment cost at the time of construction can be reduced.

In addition, when transporting the steel sheet pile 2 and the H-shaped steel 3, they can be transported separately, loading them so that they are not bulky, and efficiently transporting them, thereby reducing transportation costs. can do.
In addition, the attachment of the first guide member 24 to the steel sheet pile 2 and the attachment of the second guide member 33 to the H-section steel 3 are such that the first guide member 24 and the second guide member 33 are short. Compared with the full length welding between No. 2 and the H-section steel 3, etc., it is extremely easy and can be performed in the field or in the factory. If it is performed at the factory, the steel sheet pile 2 and the H-section steel 3 may become somewhat bulky. However, the transportation efficiency can be improved as compared with the case where the steel sheet pile and the H-section steel are integrated. it can.

In addition, although the above-mentioned embodiment demonstrated the case where the H-section steel 3 as a stiffener was arrange | positioned at the one surface side of the steel continuous wall 1, depending on the situation, the steel continuous wall 1 The H-section steel 3 may be arranged on the surfaces on both sides.
In the above-described embodiment, the angle member (L-shaped steel) 24a is used as the first guide member 24. However, as shown in FIG. 2A, a T-shaped steel (CT steel) 24b may be used. Alternatively, as shown in FIG. 2B, a lip groove steel (C-shaped steel) 24c may be used. In the case of the T-shaped steel 24b, a pair of T-shaped steel 24b is used similarly to the angle member 24a, and in the case of the lip groove shaped steel 24c, one guide member 24 can be configured.
Moreover, in the above-mentioned embodiment and FIG. 2 (a), (b), although the 1st guide member 24 was provided in the side surface used as the trough side of the steel sheet pile 2, as shown in FIG.2 (c), The 1st guide member 24 may be provided in the side of the mountain side of the steel sheet pile 2, and the H-section steel 3 as a stiffener may be arrange | positioned at the mountain side of the steel sheet pile 2. FIG.

Moreover, in the steel continuous wall 1, it is possible to select various types of stiffeners and types of steel sheet piles according to the required cross-sectional performance and other conditions, and the design freedom is wide. It has become.
Therefore, in the steel continuous wall 1, another type of stiffener or steel sheet pile can be used instead of the H-section steel 3 (stiffener) or steel sheet pile 2 of the above-described embodiment.

Below, the modified example of the stiffener and steel sheet pile used with a steel continuous wall is demonstrated.
For example, as shown in FIG. 3A, a steel pipe sheet pile 4 can be used as a stiffener. The steel pipe sheet pile 4 includes a steel pipe 42 and a T-shaped joint 41 having a T-shaped cross section into which the first guide member 24 of the steel sheet pile 2 is fitted.
Since the T-shaped joint 41 has the same cross-sectional shape as the T-shaped cross-section when the H-section steel 3 is cut at the portion of the web 31, the first guide of the above example fitted to the flange 32 of the H-shape steel 3. The first guide member having the same shape as the member 24 or the first guide member 24 can be fitted. In addition, although a general steel pipe sheet pile is provided with a pair of joints for connection to a steel pipe, this steel pipe sheet pile 4 is only a general T-shaped joint 41 as one of the pair of joints. Is provided.
Moreover, the 2nd guide member 33 will be attached to the part of the T-shaped coupling 41 of the lower end part of the steel pipe sheet pile 4 with the form substantially the same as the case of the H-section steel 3. In this example, the steel pipe sheet pile 4 having only one T-shaped joint 41 of the pair of joints is used as a stiffener, but the T-shaped joint 41 and the T-shaped joint 41 are fitted. You may use the general steel pipe sheet pile provided with both the joint which has a shape.

Also, as shown in FIG. 3B, two channel steels (C-shaped steel (no lip)) 5 may be used as a stiffener. When two channel steels 5 without lips are joined back to back in the opposite direction with the open side facing outward, the cross-sectional shape is substantially the same H shape as the H-shaped steel 3. Accordingly, the two channel steels 5 can be fitted to the first guide member 24 of the steel sheet pile 2 or the first guide member having substantially the same shape as the first guide member 24 as in the case of the H-shaped steel 3. Become. Further, the second guide member 33 is attached to the two grooved steels 5 having substantially the same shape as the H-shaped steel 3 in the same manner as the H-shaped steel 3.

Moreover, as shown to Fig.4 (a), it may replace with the hat-shaped steel sheet pile 2 of the above-mentioned embodiment, and may use the Z-shaped steel sheet pile 6 as a steel sheet pile. The Z-shaped steel sheet pile 6 has a Z-shaped cross-sectional shape by providing flanges 62 that are oblique to the web 61 and opposite to each other at both ends of the web 61. When two Z-shaped steel sheet piles 6 are combined, the shape of the hat-shaped steel sheet pile 2 is substantially the same, and the hat-shaped steel sheet pile 2 is joined to the portion where the flanges 62 of the two Z-shaped steel sheet piles 6 are joined. By providing the first guide member 24 in the same manner as the web 21, it can be used in the same manner as the hat-shaped steel sheet pile 2.

In this case, for example, the two Z-shaped steel sheet piles 6 may be constructed in the same manner as the hat-shaped steel sheet pile 2 after the joints 27 are previously fitted and joined, or the pair of angle members 24a Each one is regarded as a first guide member, and the Z-shaped steel sheet piles 6 are driven one by one so that the angle members 24a are fitted to the flanges 32 of the H-shaped steel 3 previously placed. It is good to do.
Moreover, in FIG. 4, FIG. 5, although the joint 27 of each steel sheet pile 2,6,7,8 is illustrated by the white circle, the flanges 62 of the two Z-shaped steel sheet piles 6 were joined. Since the joint portion of the joint 27 is disposed in the portion, the flange 32 of the H-section steel 3 fitted to the first guide member 24 comes into contact with the joint 27 portion protruding from the side surface of the flange 62. Become.

Moreover, as shown in FIG.4 (b), it may replace with the hat-shaped steel sheet pile 2 of the above-mentioned embodiment, and may use the linear steel sheet pile 7. FIG. The linear steel sheet pile 7 has a shape in which joints 27 are provided on both the left and right sides of the flat steel 71. By providing the first guide member 24 at the lower end of the flat steel 71 portion of the linear steel sheet pile 7, the linear steel sheet pile 7 can be fitted to the H-section steel 3.
Moreover, as shown in FIG.4 (c), it may replace with the hat-shaped steel sheet pile 2 of the above-mentioned embodiment, and may use the U-shaped steel sheet pile 8. FIG. The U-shaped steel sheet pile 8 is provided with flanges 82 each having an obliquely widening shape at both ends of a web 81 and a joint 27 provided at the tip of the flange 82. The U-shaped steel sheet pile 8 basically has a shape in which the arm 23 of the hat-shaped steel sheet pile 2 is eliminated, and the first guide member 24 is provided at the lower end portion of the web 81 as in the case of the hat-shaped steel sheet pile 2. Like the hat-shaped steel sheet pile 2, it can be fitted to the H-shaped steel 3.

5A and 5B are views showing steel continuous walls 1 and 9 made of steel sheet piles 2 and 8 and H-section steel 3.
FIG. 5A shows the steel continuous wall 1 made of the hat-shaped steel sheet pile 2 and the H-shaped steel 3 shown in the above-described embodiment, and H is formed on one side of the steel continuous wall 1. The state where the shape steel 3 is arranged in a substantially contacted state is shown.

FIG. 5 (b) is a diagram showing an example of a continuous steel wall 9 using the U-shaped steel sheet pile 8, and a plurality of U-shaped steel sheet piles 8 are connected by joints 27 and the continuous steel wall 9. The H-shaped steel is arranged in a state of being substantially in contact with the U-shaped steel sheet pile 8 on one side. In the U-shaped steel sheet pile 8, the steel sheet pile wall having the same cross-sectional shape as that of the hat-shaped steel sheet pile 2 can be constructed by arranging the directions that are generally mountain side (valley side) alternately. 5 (b), the U-shaped steel sheet piles 8 are alternately arranged so that the peaks and valleys are repeated on one side of the continuous steel wall 9.

In such a steel continuous wall 9, the first guide members 24 are arranged so as to alternate between the valley side surface and the mountain side surface of the U-shaped steel sheet pile 8, thereby the steel continuous wall. 9, the first guide member 24 is disposed only on one side surface side, and the H-section steel 3 fitted to the first guide member 24 is disposed only on one side surface side of the steel continuous wall 9. .

The H-section steel 3 may be arranged on both sides of the steel continuous wall 9 depending on the purpose of use of the steel continuous wall 9 and the situation of the construction site. In this case, in the U-shaped steel sheet pile wall in which the mountain side and the valley side are alternately arranged, the first guide member 24 may be provided only on the side surface on the valley side or only on the side surface on the mountain side.

1 Steel continuous wall 2 Hat-shaped steel sheet pile 2a Existing steel sheet pile 3 H-section steel (stiffener)
4 Steel pipe sheet pile (stiffener)
5 Channel steel (stiffener)
6 Z-shaped steel sheet pile 7 Linear steel sheet pile 8 U-shaped steel sheet pile 24 First guide member 27 Joint 33 Second guide member

Claims (6)

A steel continuous wall provided with a long stiffener in contact with the steel sheet pile along the longitudinal direction of the steel sheet pile on at least one surface side of the wall body formed by connecting the steel sheet piles. A construction method,
The lower end portion of the steel sheet pile is provided with a first guide member that is fitted to the stiffener in contact with the steel sheet pile and is movable along the longitudinal direction of the stiffener.
The lower end of the stiffener is fitted to an existing steel sheet pile previously placed adjacent to the steel sheet pile in contact with the stiffener, and the stiffener is placed in the longitudinal direction of the existing steel sheet pile. A second guide member that is movable along
The stiffener is driven into the ground while guiding the second guide member to the existing steel sheet pile, and positioning and guiding the existing steel sheet pile,
Next, the steel sheet pile is connected to the existing steel sheet pile, and the first guide member is fitted to the previously stiffened stiffener and is guided to the ground while being guided by the stiffener. A method for constructing a continuous wall made of steel. The steel sheet pile includes a joint to be connected to each of the left and right adjacent steel sheet piles,
A cross-sectional shape of the second guide member is formed to be the same as a cross-sectional shape of the steel sheet pile or a partial cross-sectional shape having at least one joint portion of the cross-sectional shape of the steel sheet pile, and the second guide member The construction method for a continuous steel wall according to claim 1, wherein a portion corresponding to the joint of the steel sheet pile is fitted into the joint of the existing steel sheet pile. When placing the stiffener, the placement of the stiffener is terminated before the second guide member fitted to the existing steel sheet pile is detached from the lower end of the existing steel sheet pile. The construction method of the steel continuous wall of Claim 1 or Claim 2. When placing the steel sheet pile, the lower end of the steel sheet pile contacts the second guide member of the stiffener and pushes the second guide member downward until the stiffener moves down. The construction method for a continuous steel wall according to claim 1, wherein the steel sheet pile is placed on the ground. A steel continuous wall provided with a long stiffener that contacts the steel sheet pile along the longitudinal direction of the steel sheet pile on at least one surface side of the wall body formed by connecting the steel sheet piles. There,
The lower end portion of the steel sheet pile is fitted to the stiffener that comes into contact with the steel sheet pile when the steel sheet pile is placed, and the steel sheet pile can be moved along the longitudinal direction of the stiffener. A guide member is provided,
The lower end portion of the stiffener is fitted to an existing steel sheet pile previously placed adjacent to the steel sheet pile in contact with the stiffener when the stiffener is placed, and the stiffener A steel continuous wall characterized in that a second guide member for determining the position of the stiffener relative to the existing steel sheet pile is provided by making the steel sheet movable along the longitudinal direction of the existing steel sheet pile. The steel sheet pile includes a joint that connects to the left and right adjacent steel sheet piles,
The cross-sectional shape of the second guide member is formed to be the same as a partial cross-sectional shape having at least one joint portion of the cross-sectional shape of the steel sheet pile or the cross-sectional shape of the steel sheet pile. Item 6. The steel continuous wall according to Item 5.

Images