JP5637657B2 - Retaining wall and its reinforcement method - Google Patents

Description

  The present invention relates to a retaining wall constructed using a plurality of steel sheet piles, and a method for reinforcing the retaining wall, and in particular, a retaining wall and a bearing wall having a T shape in plan view are provided on the back surface of the retaining wall main body. It is related with the retaining wall and its reinforcement method.

  When excavating the ground, a method of preventing collapse of the excavation surface is generally performed by forming a retaining wall by building a steel sheet pile in the ground.

The retaining wall tends to bend and deform due to earth pressure received from the ground.
In order to prevent the bending deformation, the applicant has applied for the invention described in Patent Document 1. Patent Document 1 provides a retaining wall that increases the bending rigidity of the retaining wall body by forming a three-sided fixed beam structure by providing a retaining wall and a bearing wall on the back side of the retaining wall body. Is.
Japanese Patent No. 3072065

The invention according to Patent Document 1 has a certain effect in that the bending rigidity of the retaining wall main body is increased. However, in an environment where the earth pressure rapidly increases due to an earthquake or the like, it may be assumed that the earth pressure received by the retaining wall main body cannot be dispersed by the retaining wall and the bearing wall.
In this case, the connection between the steel sheet piles constituting the retaining wall main body is only the connection at the section, so the steel sheet pile is centered on the connection part between adjacent steel sheet piles due to the earth pressure received by the retaining wall main body. rotating (FIG. 4 (a)), thus is bent earth retaining wall ahead walls (Figure 4 (b)).

  As a method for preventing the above-mentioned bending, it is conceivable to shorten the installation pitch of the retaining wall, to deepen the depth of the retaining wall, etc., but the number of members increases or the construction period is long. Therefore, it has been desired to propose a solution that can counteract the earth pressure of the ground and reduce the bending of the retaining wall body without taking the above-mentioned measures.

In order to solve the above problems, the first invention of the present application includes a retaining wall main body made of a plurality of steel sheet piles, a plurality of retaining walls protruding from the back side of the retaining wall body, and the retaining wall. A retaining wall projecting substantially parallel to the retaining wall main body, and one of the back side and the front side of the heads of the plurality of steel sheet piles constituting the retaining wall body In addition, a single H-shaped steel earth pressure resistance material is disposed along the transverse direction of the plurality of steel sheet piles, and the rotation of the plurality of steel sheet piles with the connecting portion of the adjacent steel sheet piles as an axis is constrained. Then, in order to suppress the deformation deformation of the retaining wall body, the earth retaining material and the steel sheet piles located in the section of the retaining wall and the retaining wall are integrally connected, A retaining wall is provided.
Further, the second invention of the present application is a retaining wall main body made of a plurality of steel sheet piles, a plurality of retaining walls projecting on the back side of the retaining wall body, and substantially parallel to the retaining wall body from the retaining wall. A retaining wall reinforcing method including at least a projecting bearing wall, wherein the plurality of steel sheet piles constituting the retaining wall main body are provided on either the back side or the front side of the head. An earth pressure resistance material made of H-shaped steel is arranged along the transverse direction of the steel sheet pile, and between the earth pressure resistance material and the plurality of steel sheet piles located in the interval between the adjacent retaining wall and the retaining wall A method for reinforcing a retaining wall, characterized by restraining the deformation of the retaining wall main body by restraining the rotation of the plurality of steel sheet piles with the connecting portion of adjacent steel sheet piles as an axis. It is to provide.

According to the present invention, at least one of the following effects can be obtained.
(1) The installed earth pressure resistance material can counter the earth pressure of the ground, and can suppress rotation of a steel sheet pile. Therefore , bending deformation of the retaining wall can be suppressed.
(2) without designing narrower installation pitch buttresses, can it to suppress bending deformation of earth retaining walls.
(3) without a deeper design embedment depth of the earth retaining wall body, can it to suppress bending deformation of earth retaining walls.
(4) Since the steel sheet piles constituting the earth retaining wall main body are connected by earth pressure resistance material, a plurality of earth pressure resistance materials are interposed via the earth pressure resistance material even when uneven earth pressure concentrated on one location of the steel sheet pile is generated. The earth pressure propagates to the steel sheet pile, and the dispersion effect of the uneven earth pressure is obtained.
(5) Since the effect of counteracting earth pressure can be obtained by a slight increase in the number of members, there is little influence on the construction cost and construction period.
(6) A fastener can be used to attach the earth retaining wall and the earth pressure resistance material, and since the earth pressure resistance material can be removed and reused at another site, the impact on the environment is small.

  Hereinafter, the retaining wall of the present invention will be described for each embodiment with reference to the drawings.

[Example 1]
<1> Overall Configuration This example is a retaining wall in the case where an earth pressure resistance material is laid on the back side of the retaining wall main body.
FIG. 1 is a schematic plan view showing a retaining wall according to the present embodiment, and FIG. 2 is a partial sectional view taken along line II ′ in FIG.
The retaining wall includes a retaining wall main body 1, a retaining wall 2, and a bearing wall 3 that are built in the ground.
Since the retaining wall main body 1, the retaining wall 2, and the bearing wall 3 are embedded in the ground as described in Patent Document 1, detailed description thereof is omitted.
Further, on the back side of the retaining wall main body 1, an earth pressure countermeasure material 4 configured to connect a plurality of steel sheet piles constituting the retaining wall main body 1 to each other is laid.

<2> Well-known structure The retaining wall main body 1, the retaining wall 2, and the bearing wall 3 are well-known underground structures formed by building a plurality of steel sheet piles in the ground while connecting them. Since a structure similar to that described in Document 1 is exhibited, detailed description thereof is omitted.

<3> Earth pressure resistance material Since the earth pressure resistance material 4 needs to be a member that can resist the earth pressure of the ground that generates the rotation of the steel sheet pile, it is desirable that the material is a rigid material.
Moreover, the earth pressure countermeasure material 4 needs to be a longitudinal member of the grade which can connect the whole steel sheet pile which comprises the earth retaining wall main body 1. FIG. This is because the rotation of the steel sheet piles cannot be prevented unless at least adjacent steel sheet piles are connected with one member.
As a member satisfying the above conditions, in this embodiment, H-section steel is used for the earth pressure resistance material 4.
The earth pressure resistance material 4 is not limited to the H-shaped steel, and various known members such as a grooved steel and an angle steel can be used.

<4> Laying method of earth pressure resistance material As a method of laying the earth retaining wall main body and the earth pressure resistance material, a well-known connecting method such as welding can be used.
In the present embodiment, the steel sheet pile web portion constituting the retaining wall main body 1 and the H-shaped steel flange portion constituting the earth pressure resistance material 4 are fastened by a fastener 5 such as a clamp ( (See FIG. 2).

  The earth pressure resistance material 4 can obtain a greater effect by being installed near the head of the retaining wall main body 1. This is because the bending moment generated in the main body of the retaining wall due to earth pressure is greatest near the head of the retaining wall body.

  In addition, when laying earth pressure resistance material 4 on the back side head of earth retaining wall main body 1 with fastener 5, as shown in FIG. 2, the tip of earth retaining wall main body 1 is installed height of earth pressure resistance material 4 If it is exposed for a certain amount and built in the ground, it is easier to fasten with the fastener 5 when the earth pressure resistance material 4 and the retaining wall body 1 are connected.

<5> Action According to the retaining wall having the above structure, the steel sheet piles constructing the retaining wall main body 1 are integrated with each other via the earth pressure resistance material 4, and when receiving the earth pressure of the ground. The rotation of the resulting steel sheet pile can be suppressed.
Further, by suppressing the rotation of the steel sheet pile, the displacement amount of the retaining wall between the vicinity of the retaining wall 2 and the portion away from the retaining wall 2 can be equalized.
By the above operation, the bending deformation of the retaining wall body 1 between the retaining walls 2 can be suppressed.

[Example 2]
A second embodiment based on the present invention will be described.
FIG. 3 is a partial schematic view of a retaining wall according to a second embodiment of the present invention.
In the present embodiment, the earth pressure resistance material 4 is laid on the front side (cutting side) instead of the back side of the retaining wall main body 1.
The retaining wall according to the present embodiment is useful in the field where the tip of the retaining wall main body 1 cannot be exposed to the ground surface and the earth pressure resistance material 4 cannot be installed on the back side of the retaining wall main body 1.

1 is a schematic plan view showing a retaining wall according to a first embodiment of the present invention. FIG. 2 is a partial cross-sectional view taken along line I-I ′ in FIG. 1. The plane schematic which shows the earth retaining wall which concerns on 2nd Example of this invention. Schematic which shows the structure of the conventional retaining wall.

DESCRIPTION OF SYMBOLS 1 Earth retaining wall main body 2 Retaining wall 3 Bearing wall 4 Earth pressure resistance material 5 Fastener

Claims (2)

A retaining wall body made of a plurality of steel sheet piles, a plurality of retaining walls projecting on the back side of the retaining wall body, and a bearing wall projecting substantially parallel to the retaining wall body from the retaining wall A retaining wall,
An earth pressure resistance material made of H-shaped steel is provided on either the back side or the front side of the heads of the plurality of steel sheet piles constituting the earth retaining wall main body along the transverse direction of the plurality of steel sheet piles. Place and
The earth pressure located in the section between the adjacent retaining wall and the retaining wall so as to restrain the bending deformation of the retaining wall main body by restraining the rotation of the plurality of steel sheet piles with the connecting portion of the adjacent steel sheet piles as an axis. The counter material and the plurality of steel sheet piles are integrally connected,
Retaining wall. A retaining wall body made of a plurality of steel sheet piles, a plurality of retaining walls projecting on the back side of the retaining wall body, and a bearing wall projecting substantially parallel to the retaining wall body from the retaining wall A method for reinforcing a retaining wall comprising at least
An earth pressure resistance material made of H-shaped steel is provided on either the back side or the front side of the heads of the plurality of steel sheet piles constituting the earth retaining wall main body along the transverse direction of the plurality of steel sheet piles. Place and
The earth retaining material and the plurality of steel sheet piles, which are located in the section between the adjacent retaining wall and the retaining wall, are integrally coupled, and the plurality of steel sheet piles having the connecting portion of the adjacent steel sheet piles as an axis. It is characterized by restraining the rotation and restraining the bending deformation of the retaining wall body,
How to reinforce the retaining wall.

Images