JP4683138B2 - Retaining wall structure, method for constructing retaining wall structure - Google Patents

Description

  The present invention relates to a retaining wall structure that can stand on its own without providing a support, and a construction method thereof.

  Conventionally, when constructing a vertical hole or underground structure, a retaining wall is constructed to support the surrounding ground. However, since the retaining wall cannot be used alone, it is necessary to support a beam in the retaining wall. It is necessary to bridge. This kind of beam support work is built in multiple steps inside the retaining wall by repeating the process of excavating the inside of the retaining wall to a predetermined depth and the process of laying the beam support work inside the retaining wall. (For example, refer to Patent Document 1).

JP-A-1-207526

  Here, when the above-mentioned beam support work is provided, the construction work and the removal work are troublesome, and the excavation work becomes intermittent and the construction period is prolonged. In addition, there is a problem that the beam support work becomes an obstacle to the work inside the retaining wall and the workability is impaired.

  This invention is made | formed in view of said problem, and is providing the earth retaining wall structure which can become independent, without providing a beam support work.

The earth retaining wall structure of the present invention is a earth retaining wall structure for supporting the ground around the excavation space when excavating the ground to form an excavation space, and the lower part advances toward the excavation space. A sloping wall body inclined in this manner, and a dredging wall that is integrally constructed at least on the opposite side of the excavation space of the cleat wall body, wherein the cleat wall body and the dredging wall are soil cement walls, A core material is embedded in a portion of the wall body to which the wall is connected, a core material is embedded in the wall, a core material embedded in the earth retaining wall body, and a core embedded in the wall the wood, characterized that you have been connected by a connecting member.

Further, the earth retaining wall structure of the present invention is a earth retaining wall structure for supporting the ground around the excavation space when excavating the ground to form the excavation space, and the lower side faces the excavation space. A retaining wall body inclined so as to advance and a anchor wall integrally constructed at least on the opposite side of the excavation space of the retaining wall body, and the retaining wall body and the anchor wall include a plurality of steel sheet piles. The steel sheet piles constituting the anchor wall are arranged along the retaining wall main body so that the steel sheet pile is perpendicular to the retaining wall main body in a plan view and the lower part advances toward the excavation space. It is characterized by being placed on the ground diagonally.
In the above Retaining wall structure, before Symbol buttresses it is part thereof may reach the opposite area between the earth retaining wall body than the main働滑Ri surface.

The method for constructing a retaining wall structure according to the present invention is a method for constructing a retaining wall structure for supporting the ground around the excavation space when excavating the ground to form an excavation space. The first excavation hole is inclined so that the lower part advances toward the excavation space, and the earth and sand and cement milk generated by the excavation are mixed and stirred in the first excavation hole. A step of forming a soil cement, a second excavation hole is drilled so as to intersect the first excavation hole, and earth and sand and cement milk generated by the drilling are formed in the second excavation hole. A step of forming a soil cement by mixing and stirring, a step of building a core material in a portion of the first excavation hole to which the second excavation hole is connected, and an inside of the second excavation hole Building the core material, and 1 of the borehole in the built up but the core material, characterized in that it comprises a step of connecting the connecting member and a core member that built up in said second borehole.
Also, method for constructing a earth retaining wall structure of the present invention, in forming the drilling space and drilling the ground, a method for constructing a earth retaining wall structure for supporting the ground around the excavation space, is lower A step of constructing a retaining wall main body formed by connecting a plurality of steel sheet piles placed in an inclined state so as to advance toward the excavation space; and at least one side of the retaining wall main body opposite to the excavation space; A plurality of steel sheet piles that are slanted along the retaining wall main body so as to be perpendicular to the retaining wall main body in a plan view and advanced downward toward the excavation space. And a step of constructing a wall .

  According to the present invention, since the retaining wall main body is inclined, the volume of earth and sand between the main sliding collapse surface and the retaining wall main body is reduced, the earth pressure acting on the retaining wall main body is reduced, and the connecting member Since the dredging wall resists the earth pressure transmitted to the dredging wall by the frictional force with the surrounding ground, the retaining wall main body can stand by itself.

It is a perspective view which shows the earth retaining wall structure of this embodiment. It is a vertical sectional view showing the retaining wall structure of this embodiment. It is FIG. (1) for demonstrating the method of constructing a retaining wall structure. It is FIG. (2) for demonstrating the method of constructing a retaining wall structure. It is FIG. (3) for demonstrating the method of constructing a retaining wall structure. It is FIG. (4) for demonstrating the method of constructing a retaining wall structure. It is a figure for demonstrating the method to build in the H-shaped steel connected with the connection member. It is a figure for demonstrating the method to build in the H-shaped steel connected with the connection member. The excavator used when constructing a retaining wall main body is shown, (A) is a front view, (B) is a side view. It is a figure which shows the earth retaining wall structure which abbreviate | omitted the core material and connecting member in a ridge wall. It is a figure which shows the retaining wall structure which comprised the anchor wall and the retaining wall main body with the steel sheet pile.

Hereinafter, an embodiment of the earth retaining wall structure of the present invention will be described in detail with reference to the drawings.
1 and 2 show the retaining wall structure 10 of the present embodiment, FIG. 1 is a perspective view, and FIG. 2 is a vertical sectional view in a direction perpendicular to the retaining wall. As shown in FIG. 1, the retaining wall structure 10 of the present embodiment includes a retaining wall body 20 and a anchor wall 30 that protrudes from the retaining wall body 20 toward the opposite side of the excavation space.

  The earth retaining wall main body 20 has a soil cement 21 formed in a plate shape inclined at an inclination angle α larger than the main sliding angle θ and advanced downward toward the excavation space 1, and the soil cement 21. It comprises a plurality of H-shaped steels 22 embedded so as to extend in the up-down direction at intervals in the horizontal direction, and a bellows 23 attached to the excavation space 1 side above the plurality of H-shaped steels 22. .

  The surface of the H-shaped steel 22 is exposed in the excavation space 1, and the flank 23 is fixed to the surface of each H-shaped steel 22. Further, the H-shaped steel 22 is embedded at least at a position where the retaining wall 30 of the retaining wall body 20 is connected.

  The dredging wall 30 is a trapezoidal wall body having a height from the bottom of the excavation space 1 to the surrounding ground surface, and is substantially at the edge of the soil cement 31 and the edge of the soil cement 31 opposite to the retaining wall body 20. It is comprised with the H-shaped steel 32 embed | buried so that it may extend in a perpendicular direction. The H-shaped steel 32 embedded in the anchor wall 30 and the H-shaped steel 22A embedded in the portion where the anchor wall 30 of the retaining wall body 20 is connected are, for example, a connecting member 40 such as a PC steel wire in the upper part and the lower part. , 41. Further, the anchor wall 30 is formed so that a part thereof reaches a region on the opposite side of the main retaining sliding surface F of the ground from the retaining wall body 20 (that is, a region where no slip occurs).

  A load of earth and sand in a portion (shown by hatching in FIG. 2) between the main sliding surface and the earth retaining wall body 20 acts on the earth retaining wall body 20 as earth pressure. In this embodiment, since the earth retaining wall body 20 is provided so as to be inclined, the volume of earth and sand between the main sliding surface F and the earth retaining wall body 20 is reduced. The pressure is reduced. Further, earth pressure acting on the retaining wall main body 20 is transmitted to the anchor wall 30 via the connecting members 40, 41. However, a frictional force acts between the anchor wall 30 and the surrounding ground, and this earth In order to resist pressure, the retaining wall main body 20 can stand on its own without providing a beam support.

Hereinafter, a method for constructing the above retaining wall structure 10 will be described with reference to FIGS. 3A to 3F, FIGS. 4A, 4 </ b> B, and 5.
FIG. 5 shows the excavator 300 used when constructing the retaining wall main body 20, (A) is a front view, and (B) is a side view. As shown in the figure, the excavating apparatus 300 is an apparatus used for the TRD method or the like, and includes a chainsaw type cutter 310 having a mechanism for discharging cement milk from the tip, and excavating the ground with the cutter 310 to excavate a hole. And the cement milk is discharged from the tip, the cement milk and the excavated soil are agitated, and a soil cement can be formed in the excavation hole. In addition, the excavator 300 can control the posture of the cutter 310 so as to have a desired angle by extending the jack 320.

  In order to construct the earth retaining wall structure 10, first, as shown in FIG. 3A, the first excavation hole 24 is formed by excavating the ground with the cutter 310 while the cutter 310 is inclined by the excavator 300. At the same time, the cement milk is mixed and stirred in the excavated soil, and the soil cement 21 is manufactured in the first excavated hole 24. Thus, the ground is continuously excavated in the horizontal direction by moving the excavator 300 while the cutter 310 is rotated. As will be described later, since the second excavation hole 34 needs to be formed before the soil cement 21 manufactured in the first excavation hole 24 is cured, a retarder is added to the cement milk as necessary. May be mixed.

  Further, as shown in FIG. 3B, the first drilling hole 24 is continuously formed in the horizontal direction, and before the soil cement 21 manufactured in the first drilling hole 24 is hardened, as shown in FIG. A plurality of plate-like second excavation holes 34 are formed so as to intersect with 24 at right angles. At this time, the second excavation hole 34 is formed, and cement milk is mixed and stirred in the earth and sand generated by excavation, and the soil cement 31 is manufactured in the second excavation hole 34. In addition, as an apparatus for forming the 2nd excavation hole 34, the excavation apparatus used for a power blender construction method can be used.

  Next, before the soil cements 21 and 31 in the first and second excavation holes 24 and 34 are hardened, the H-shaped steels 22 and 32 embedded in the earth retaining wall main body 20 and the dredging wall 30 are connected to the excavation holes 24 and Built in 34. At this time, the H-shaped steel 32 embedded in the anchor wall 30 and the H-shaped steel 22A embedded in the portion to which the anchor wall 30 of the retaining wall body 20 is connected are built in a state of being connected by the connecting member 41. 4A and 4B are views for explaining a method of building these H-shaped steels 32 and 22A in a state where they are connected by a connecting member 41. FIG. When the H-shaped steels 32 and 22A are built, the lower portions of the H-shaped steels 32 and 22A are previously connected by the connecting member 41 as shown in FIG. 4A. Then, the H-shaped steels 32 and 22A connected by the connecting member 41 are lifted by a lifting device such as a crane. And these H-shaped steel 32 and 22A are arrange | positioned so that the lower part of H-shaped steel 22A may be inserted in the 1st excavation hole 24. FIG. In this state, the H-shaped steel 22A can be tilted as shown in FIG. 4B by bringing the upper portion of the H-shaped steel 22A closer to the H-shaped steel 32. Then, with the upper parts of the H-shaped steels 32 and 22A exposed on the ground, the upper parts of the H-shaped steels 32 and 22A are connected by the connecting member 40, and the H-shaped steels 32 and 22A are embedded in the excavation holes 34 and 24.

  Then, as the soil cements 21 and 31 in the first and second excavation holes 24 and 34 are hardened, as shown in FIG. 3C, the inclined retaining wall main body 20 and the plate shape intersecting with the retaining wall main body 20. The wall body 50 is constructed integrally.

Next, the ground on the excavation space 1 side of the retaining wall body 20 is excavated to such a depth that the belly 23 is attached, and the upper portion of the soil cement 31 protruding to the excavation space 1 side is excavated. Then, as shown in FIG. 3D, the belly 23 is attached to the surface of the H-shaped steel 22 embedded in the retaining wall body 20. In addition, when the H-shaped steel 22 is not exposed on the surface of the retaining wall main body 20, the soil cement 21 may be cut to expose the surface of the H-shaped steel 22. Then, the soil cement 31 protruding toward the excavation space 1 is dismantled while forming the excavation space 1 using the excavator.
The retaining wall structure 10 can be constructed by the above steps.

  According to the present embodiment, the earth retaining wall body 20 is provided so as to be inclined so that the lower part advances toward the excavation space 1, so that the earth and sand between the main sliding surface F and the earth retaining wall body 20 are provided. Therefore, the earth pressure acting on the retaining wall main body 20 is reduced. In addition, earth pressure acting on the retaining wall main body 20 is transmitted to the anchor wall 30 via the connecting members 40 and 41, but a frictional force acts between the anchor wall 30 and the surrounding ground. In order to resist pressure, the retaining wall main body 20 can stand on its own without providing a beam support.

  In addition, a part of the anchor wall 30 reaches the region opposite to the retaining wall main body 20 from the main sliding surface F of the ground, and the ground of this portion does not slip, so that the friction from the ground is ensured. Can receive power.

  In addition, in this embodiment, although the part which protrudes in the excavation space 1 side of the earth retaining wall main body 20 of the wall body 50 shown to FIG. 3C was removed, it is good not only in this but leaving.

  Moreover, in this embodiment, although the eaves wall 30 was made trapezoidal, not only this but another appropriate shape can be employ | adopted. Under the present circumstances, by making it the shape which the part located outside the main sliding surface of the retaining wall main body 20 becomes large, frictional resistance becomes large and the supporting force by the eaves wall 30 becomes large.

  In this embodiment, the H-shaped steel 32 is embedded in the anchor wall 30, and the H-shaped steel 32 of the anchor wall 30 and the H-shaped steel 22A of the retaining wall body 20 are connected by the connecting members 40, 41. Not only this but as shown in FIG. 6, you may abbreviate | omit the H-shaped steel in the collar wall 30, and the connection members 40 and 41. FIG.

  Moreover, in this embodiment, although the anchor wall 30 and the retaining wall main body 20 were comprised with the soil cement wall, you may comprise using the steel sheet piles 121 and 131 as shown in FIG. In such a case, first, the earth retaining wall main body 120 is constructed by placing a plurality of steel sheet piles 121 obliquely so as to advance downward toward the excavation space 1 with a vibro hammer or the like. Next, a plurality of steel sheet piles 131 are placed diagonally so that the steel sheet pile 131 is perpendicular to the retaining wall main body 120 in a plan view and the lower part advances toward the excavation space 1 to construct the wall 130. The steel sheet pile 131 on the retaining wall main body 120 side is connected to the retaining wall main body 120 by a well-known joint means. Then, the ground of the excavation space 1 is excavated. The same effect as that of the above-described embodiment can be obtained by the retaining wall structure 110 having such a configuration.

DESCRIPTION OF SYMBOLS 1 Excavation space 10, 110 Earth retaining wall structure 20, 120 Earth retaining wall main body 21, 31 Soil cement 22, 22A, 32 H-shaped steel 24, 34 Drilling hole 30, 130 Anchor wall 40, 41 Connecting member 50 Wall body 121, 131 Steel sheet pile

Claims (5)

A retaining wall structure for supporting the ground around the excavation space when excavating the ground to form the excavation space,
A retaining wall body inclined so that the lower part advances toward the excavation space;
Comprising a wall constructed integrally with at least the excavation space of the retaining wall main body ;
The retaining wall main body and the eaves wall are made of soil cement walls,
A core material is embedded in the portion of the earth retaining wall body to which the wall is connected,
A core material is embedded in the wall,
The earth retaining wall body buried core, wherein A buttresses the buried core, earth retaining wall structure which is characterized that you have been connected by a connecting member. A retaining wall structure for supporting the ground around the excavation space when excavating the ground to form the excavation space,
A retaining wall body inclined so that the lower part advances toward the excavation space;
Comprising a wall constructed integrally with at least the excavation space of the retaining wall main body ;
A plurality of steel sheet piles are connected to the retaining wall main body and the anchor wall,
The steel sheet pile constituting the anchor wall is applied to the ground obliquely along the earth retaining wall main body so that the steel sheet pile perpendicular to the earth retaining wall main body in a plan view and the lower part advances toward the excavation space. earth retaining wall structure which is characterized that you have been set. The retaining wall structure according to claim 1 or 2 ,
The retaining wall structure characterized in that a part of the anchor wall reaches a region opposite to the retaining wall body rather than a main sliding surface of the retaining wall body. A method of constructing a retaining wall structure for supporting the ground around the excavation space when excavating the ground to form an excavation space,
The first excavation hole that is inclined so that the lower part advances toward the excavation space on the ground, and the earth and sand generated by the excavation and cement milk are mixed and stirred in the first excavation hole. And forming a soil cement,
The second excavation hole is drilled so as to intersect the first excavation hole, and the soil cement generated by the drilling is mixed and stirred in the second excavation hole to obtain the soil cement. Forming step;
Building a core in a portion of the first excavation hole to which the second excavation hole is connected ;
Building a core in the second borehole;
Connecting the core material built in the first excavation hole and the core material built in the second excavation hole by a connecting member;
The construction method of the retaining wall structure characterized by comprising. A method of constructing a retaining wall structure for supporting the ground around the excavation space when excavating the ground to form an excavation space,
Constructing a retaining wall main body formed by connecting a plurality of steel sheet piles placed in an inclined state so that the lower part advances toward the excavation space;
Along the retaining wall main body so as to be integral with at least the side of the retaining wall body opposite to the excavation space , perpendicular to the retaining wall body in plan view, and so that the lower part advances toward the excavation space. Constructing a wall made by connecting a plurality of steel sheet piles placed diagonally
The construction method of the retaining wall structure characterized by comprising.

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