Retaining wall structure and method for constructing gravity type retaining wall structure

Abstract

To provide a retaining wall structure which is used for earth retaining work of a bent part, a gravity type retaining wall structure in which concrete is placed in the retaining wall structure, and a method for constructing the same.SOLUTION: There are provided a gravity type retaining wall structure which is used in earth retaining work on a bent part, wherein a box shape is formed by a retaining wall structure constituted of a set of two retaining wall bodies and two back face walls, a heavy load such as crushed stone is laid as a stuffing material in a hollow part of the box shape, and cast-in-place concrete is placed therein; and a method for constructing the same.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a retaining wall structure used for retaining earth at a bent portion, a gravity-type retaining wall structure formed by pouring concrete into said retaining wall structure, and a method for constructing the same. [Background technology]

[0002] Traditionally, L-shaped or gravity-type retaining wall structures have been used in areas where earth retention is required for road construction, housing development, and other such projects. These retaining wall structures are generally constructed using precast (reinforced) concrete (hereinafter, in this invention, no distinction is made between "precast reinforced concrete" and "precast concrete," and they are collectively referred to as "precast materials"), cast-in-place concrete, or a combination of these. The retaining wall structure is not only required in straight sections, but also in curved sections. In particular, when retaining the earth in curved sections, the entire retaining wall structure may be constructed using cast-in-place concrete, or a retaining wall structure made of precast materials may be installed.

[0003] However, in order to construct all retaining wall structures using cast-in-place concrete, it is necessary to secure the labor force to carry out on-site construction work (rebar work, formwork, concrete work, curing work, etc.). This is difficult due to the declining number of people working in the construction industry and the reduction in working hours resulting from recent work style reforms, and there is also the problem of large amounts of waste materials being generated. In addition, when retaining wall structures made of precast materials are used on straight sections facing the road, the differences in finish, color and texture of the surface can create an awkward feeling compared to retaining wall structures made of cast-in-place concrete, and complaints about the appearance can lead to requests for repair work.

[0004] Furthermore, since retaining wall structures made of precast materials must be custom-made, they are significantly less economical. In addition, when a retaining wall structure made of precast materials is used as a retaining wall for residential land, it falls outside the scope of Article 14 of the Enforcement Order of the Law Concerning the Control of Land Development, etc. In addition, ministerially certified products require the manufacturer to provide technical guidance and be responsible for construction, and there is also the problem that the manufacturer is restricted to being on-site during construction.

[0005] Due to these challenges, in most retaining wall construction projects up until now, retaining wall structures made of precast materials have been installed on the straight sections facing the road, while gravity retaining walls (plain concrete) made of cast-in-place concrete or L-shaped retaining wall structures made of reinforced concrete have been constructed on the curved sections. As a precast construction method (RC structure) that can handle curved sections, for example, the following prior art has been disclosed.

[0006] Patent Document 1 discloses an L-shaped retaining wall bend member and a construction method for the bend member, in which the sides of the substantially vertical vertical walls of at least two L-shaped retaining wall members joined at a bend are interlocked to form a hinge joint, and the height dimensions are such that the lower surface of the base plate of one L-shaped retaining wall member is positioned at least the thickness of the lower surface of the base plate of the other L-shaped retaining wall member, and when interlocked in this manner, the upper surfaces of the two L-shaped retaining wall bend members are substantially at the same height, and when the two L-shaped retaining wall bend members are interlocked, they can be rotated to any angle around the hinge joint of the vertical walls as the center of rotation.

[0007] A hinged joint connection configuration is convenient because it allows the corner angle to be freely adjusted, but there is a problem in that the bottom slabs of adjacent retaining walls interfere with each other, causing inconvenience when adjusting the angle.

[0008] Patent Document 2 also discloses a concrete product for constructing a corner portion of a retaining wall, the concrete product having a first wall body and a second wall body made of concrete arranged adjacent to each other on the left and right, and a connecting member embedded on the adjacent side of the first wall body and the second wall body to connect the first wall body and the second wall body so that the angle formed by the first wall body and the second wall body can be changed, the connecting member being embedded so that a gap is formed between the first wall body and the second wall body.

[0009] This allows the angle of the corner formed by the first wall and the second wall to be changed on site, and then concrete can be poured through the gap between the first wall and the second wall so that the outside and inside of the corner are integrated, and the corner portion can be sealed with concrete. However, although this product has an angle adjustment function, adjacent retaining walls are connected in advance by connecting members, which causes problems in storage, transportation, and product self-supporting.

[0010] Patent document 3 also discloses a corner retaining wall block that is arranged in a corner of a retaining wall structure in which retaining wall blocks are arranged side by side on either side of the corner, the corner retaining wall block consisting of a set of retaining wall blocks connected by a hinge structure, each of the retaining wall blocks having a block body with a convex portion extending vertically formed at approximately the center of one side of the vertical wall, and a plurality of reinforcing bars protruding from the lower side of the vertical wall including the convex portion.

[0011] According to this, a pair of retaining wall blocks connected by a hinge structure have a block body with a convex portion extending vertically formed at approximately the center of one side of the vertical wall, and a plurality of reinforcing bars protruding from the lower side of the vertical wall including the convex portion, so that the left and right blocks can be made to stand on their own at the construction site, the corner arrangement angle of the blocks can be easily set without interfering with each other, and an L-shaped bottom support structure can be constructed around the reinforcing bars protruding from the vertical wall, resulting in excellent handleability and assembly workability. However, because it is a half-precast method using reinforced concrete, the base structure needs to be constructed on-site. Compared to retaining wall structures made of cast-in-place concrete, the number of work steps is reduced and the labor burden is lighter, but since formwork, reinforcing bar work, concrete work and curing work are required, it cannot be said that it contributes significantly to improving productivity. Furthermore, in precast products, the main rebars are already installed and the main rebars in the base plate are exposed. If the rebars corrode during curing and storage, it can cause a decrease in structural strength and the occurrence of cracks, raising concerns about the impact on durability. [Prior art documents] [Patent documents]

[0012] [Patent Document 1] JP2004-36247A [Patent Document 2] JP2007-247388A [Patent Document 3] JP2010-261168A Summary of the Invention [Problem to be solved by the invention]

[0013] Therefore, in order to solve the conventional problems, the present invention provides a gravity retaining wall structure made of precast materials for use in retaining work at bends, and a retaining wall construction method that uses the retaining wall structure in combination with cast-in-place concrete. [Means for solving the problem]

[0014] In order to solve the problems in the prior art, the present invention provides the following technical solutions:

[0015] The gravity-type retaining wall structure according to the present invention comprises: A retaining wall structure used for earth retaining construction at a bent section, The retaining wall structure is It is composed of a retaining wall body and a back wall, each of which consists of two bodies. The main body of the retaining wall is It is formed of a front wall and a buttress in a roughly L-shape when viewed from above, The side end of the front wall opposite the side on which the buttress is formed is rounded, The back wall is It is formed into a flat plate, One side end surface is rounded, The two retaining wall bodies are installed facing each other so that their rounded side ends abut each other. The two back walls are installed facing each other so that their rounded side end faces abut against each other in the approximately U-shaped opening formed by the two retaining wall bodies, The two retaining wall bodies and the back wall form a box shape. It is characterized by: Gravity retaining wall structures are: Cast-in-place concrete was poured into the hollow parts of the box-shaped retaining wall structure in which the retaining wall bodies, the back walls, and the retaining wall bodies and the back walls are connected by connecting members. It is characterized by:

[0016] The method for constructing a gravity-type retaining wall structure according to the present invention comprises the steps of: It is formed of a front wall and a buttress in a roughly L-shape when viewed from above, The front wall has two retaining wall bodies with rounded side ends on the side opposite to the side on which the buttress is formed, It is formed into a flat plate, One side end surface has two rounded back walls and A retaining wall structure made of precast materials used for earth retaining work at the bend, The two retaining walls and the back wall form a box shape. The two retaining wall bodies are installed facing each other so that their rounded side end faces abut each other, The two back walls are installed facing each other in the approximately U-shaped opening formed by the two retaining wall bodies so that their rounded side end faces abut against each other, The retaining wall main bodies are connected to each other, the rear walls are connected to each other, and the retaining wall main bodies and the rear walls are connected to each other by connecting members, By pouring cast-in-place concrete into the hollow part of the box-shaped retaining wall structure, Build a gravity retaining wall It is characterized by: [Brief description of the drawings]

[0017] [Figure 1] Schematic perspective view of the rear side of the retaining wall body (left) and schematic perspective view of the front side (right) [Diagram 2] Six-direction diagram of the retaining wall body [Diagram 3] Schematic perspective view of the rear side of the rear wall (left) and schematic perspective view of the front side (right) [Figure 4] Six-way diagram of the rear wall [Diagram 5] A schematic perspective view of the rear side of a gravity-type retaining wall structure showing an embodiment in which two retaining wall bodies are installed opposite each other. [Figure 6] A schematic perspective view of the rear side of a gravity-type retaining wall structure showing an embodiment in which two retaining wall bodies and a rear wall are installed facing each other. [Figure 7] FIG. 1 is a schematic perspective view of the front side of a gravity-type retaining wall structure showing an embodiment in which the rear wall can be freely slidably installed in the longitudinal direction. [Figure 8] A schematic perspective view of the rear side of a gravity-type retaining wall structure showing an example in which a fully threaded stud (rod) is used as a connecting member. [Figure 9] FIG. 1 is a schematic perspective view of the rear side of a gravity-type retaining wall structure showing an embodiment in which turnbuckles are used as connecting members. [Figure 10] FIG. 1 is a schematic perspective view of the rear side of a gravity-type retaining wall structure showing an embodiment in which welded reinforcing bars are used as connecting members. [Figure 11] A schematic perspective view of the rear side of a gravity-type retaining wall structure with one L-shaped cantilever-type retaining wall installed on each side. [Figure 12] A schematic perspective view of the front side of a gravity-type retaining wall structure with one L-shaped cantilever-type retaining wall installed on each side. [Figure 13] A schematic perspective view of the front side of a gravity-type retaining wall structure with two L-shaped cantilever-type retaining walls installed on either side. [Figure 14] A schematic perspective view of the rear side of a gravity-type retaining wall structure with two L-shaped cantilever-type retaining walls installed on either side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0019] The gravity-type retaining wall structure of the present invention is a retaining wall structure made of precast materials used for retaining earth at bent sections, and as shown in Figure 6, the retaining wall structure is composed of a retaining wall main body 1 and a back wall 2, each of which is configured as a set of two bodies. As shown in Figures 1 and 2, the retaining wall main body 1 is formed in an approximately L-shape when viewed from above, consisting of a front wall 1a and a buttress 1b, and the side end face 1c of the front wall 1a opposite the side on which the buttress 1b is formed has a rounded shape. As shown in FIGS. 3 and 4, the rear wall 2 is formed in a flat plate shape, and one side end face 2a has a rounded shape. The other side end surface 2b of the rear wall may be flat or may be rounded like the first side end surface 2a.

[0020] As shown in FIG. 6, the two retaining wall bodies 1 are placed opposite each other so that their rounded side end faces 1c abut against each other. At this time, the two retaining wall bodies 1 are installed in a substantially U-shape, as shown in FIG. The two back walls 2 are installed facing each other so that their rounded side end faces 2a abut against each other in the approximately U-shaped opening created by installing the two retaining wall main bodies 1 as shown in Figure 5. In this way, each of the two retaining wall bodies 1 and the back wall 2 is installed in a box shape as shown in FIG.

[0021] Normally, a retaining wall having an L-shaped configuration, known as an L-shaped retaining wall, is used as a cantilever retaining wall, with a board called a heel plate laid behind the front wall on the bottom surface of the installation location. However, the retaining wall main body 1 of the present invention, although being an L-shaped retaining wall, is used in a state in which it forms approximately an L-shape when viewed in a plane, as shown in Figure 2, with the front wall 1a and the buttress 1b forming an approximately L-shape in a plane view.

[0022] The buttress 1b is a vertical wall extending from the front wall 1a toward the rear, which allows the retaining wall main body 1 to stand stably and independently even when it is removed from the form, transported, and installed. The buttress 1b may be shaped so that its height does not change as it approaches the rear side, or it may be shaped so that its height decreases as it slopes toward the rear side.

[0023] The front wall 1a has a side end surface 1c opposite to the side on which the buttress 1b is formed, which has a rounded shape. Therefore, when two retaining wall bodies 1 are installed facing each other so that their rounded side end faces 1c abut, they can be installed in a bent state at any angle, as shown in Figure 6, depending on the bent portion to be installed. In other words, when installing two retaining wall bodies 1 adjacent to each other, if the abutting surfaces of the two retaining wall bodies 1 are flat, they can only be installed so that the flat surfaces overlap, and generally, they can only be installed in a straight line. Therefore, in order to enable the retaining wall main bodies 1 to be bent according to the angle of the bend regardless of the installation location, the abutment surfaces between the retaining wall bodies 1, i.e., the side end surface 1c of the front wall 1a opposite the side on which the buttress 1b is formed, are made to have a rounded shape.

[0024] The back wall 2 is installed so as to close the openings of the two retaining wall bodies 1 installed in a substantially U-shape. The rear wall 2 is formed in a flat plate shape, and one side end face 2a has a rounded shape. Therefore, similarly to the retaining wall main body 1, the two back walls 2 can also be installed by bending them according to the angle of the bent part, regardless of the installation location having any bent part.

[0025] The other side end surface 2b of the rear wall 2 may be flat or may be rounded like the one side end surface 2a. If the other side end face 2b of the rear wall 2 has a rounded shape, the rear wall 2 does not need to be installed parallel to the front wall 1a of the retaining wall main body 1, and the rear walls 2 can be installed in a bent state at any angle (horizontal angle).

[0026] In this case, the width (longitudinal length, not thickness) of the rear wall 2 can be changed according to the bending angle (horizontal angle) of the retaining wall main body 1, and a rear wall 2 of a width according to the bending part at the installation location can be used. In addition, rather than changing the width of the rear wall 2, the rear wall 2 can be slid longitudinally behind the buttress 1b of the retaining wall main body 1 so as to adjust its installation position, as shown in Figure 7. This makes it possible to adjust the installation position even if construction errors occur on-site. The installation position of the rear wall 2 can be adjusted, for example, by adjusting the length of the screw holes of the connecting angle steel materials. In addition, the truss reinforcement can be ejected from the rear wall 2 side to be integrated with the cast-in-place concrete.

[0027] The gravity retaining wall structure of the above configuration can be used as a box-shaped precast material like a box-type retaining wall, by installing the two retaining wall bodies 1 and the back walls 2 to form a box shape.However, what differs from a box-type retaining wall is that when the retaining wall bodies 1 are connected to each other, any bending angle (horizontal angle) can be created, and that the bending angle (horizontal angle) can be changed as desired. In other words, a box-type retaining wall has a box-like shape in itself and cannot be used alone for retaining earth at a bent section, but the gravity retaining wall structure of the present invention can be used for retaining earth with any type of bend, because the retaining wall main body 1 can be installed so that the bending angle (horizontal angle) matches the bending section at the construction site.

[0028] Furthermore, after the retaining wall main body 1 and the rear wall 2 are installed in a box shape, the retaining wall main bodies 1, the rear walls 2, and the retaining wall main body 1 and the rear wall 2 can be connected to each other using connecting members via inserts embedded inside each of the retaining wall main body 1 and the rear wall 2. A variety of connecting members can be used, such as fully threaded studs (rods) (Figure 8), turnbuckles (Figure 9), threaded rebar (Figure 10), and threaded knotted rebar (Figure 10). Rebar can also be connected by welding.

[0029] Furthermore, the gravity retaining wall structure of the present invention allows the hollow portion formed by combining the retaining wall main body 1 and the rear wall 2 to be filled with heavy materials such as crushed stone as a filler material, or to be poured with in-situ concrete. In particular, when pouring in-situ concrete, the gravity-type retaining wall structure of the present invention serves as a formwork.

[0030] A typical box-type retaining wall has the advantage that by filling the hollow part with heavy materials such as crushed stone as a filler, the weight of the box-type retaining wall and the filler material, as well as the support resistance and shear resistance of the filler material, can be used to withstand external forces such as earth pressure. The gravity-type retaining wall structure of the present invention can also withstand external forces such as earth pressure by utilizing the weight of the retaining wall main body 1, rear wall 2, and the filler material or cast-in-place concrete, as well as the support resistance and shear resistance of the filler material or cast-in-place concrete, and a gravity-type retaining wall structure can be constructed.

[0031] When filling the hollow portion formed by combining the retaining wall main body 1 and the rear wall 2 of the gravity retaining wall structure of the present invention with heavy materials such as crushed stone as a filling material or pouring in-situ concrete, a cylinder 3 for a drain hole can be arranged as shown in Figures 7 to 11 depending on the site.

[0032] The gravity retaining wall structure of the present invention, which has the above-mentioned effects, not only facilitates on-site construction, reduces labor hours and improves work efficiency, which are advantages unique to precast materials, but also reduces overall construction costs and improves quality, appearance and safety.

[0033] Incidentally, when the front wall 1 of the main retaining wall 1 for residential land is put into service (installed), the front (road) side is often given a gradient (slope) of about 1 to 2% within a range that does not exceed the public-private boundary, taking into consideration creep deformation due to earth pressure on the rear side, etc. Therefore, in the gravity retaining wall structure of the present invention, so that the slope of the front (road) side of the front walls 1a of adjacent retaining wall bodies 1 is consistent, the front side of the front wall 1a can be provided with a slope that gradually protrudes from each of the other corners toward the bottom corner of the front wall 1a on the side where the buttress 1b is formed (Figures 1 and 2).

[0034] As shown in Figs. 11 to 14, the gravity-type retaining wall structure according to the present invention can have one or more L-shaped retaining walls 4 as cantilever-type retaining walls installed adjacent to the gravity-type retaining wall structure.

[0035] In addition, the gravity-type retaining wall structure of the present invention can be configured so that one or more sets of retaining wall structures, or one or more sets of one retaining wall body 1 and one rear wall 2, can be installed adjacent to the retaining wall structure consisting of a set of the two retaining wall bodies 1 and rear walls 2 described above. When multiple retaining wall structures are installed adjacent to each other, they can be installed in a bent state at any angle at each adjacent installation location, depending on the bent portion to be installed. Even when more than one set of a retaining wall main body 1 and a rear wall 2 are installed adjacent to each other in a gravity retaining wall structure, they can be installed in an arbitrarily bent state at each adjacent installation point, depending on the bent portion to be installed.

[0036] The above gravity retaining wall structure can be constructed using the following construction method.

[0037] Two retaining wall bodies 1 each having a roughly L-shape in plan view formed from a front wall 1a and a buttress 1b, with rounded side end surface 1c of the front wall 1a opposite the side on which the buttress 1b is formed, are installed opposite each other so that the rounded side end surfaces 1c abut against each other, as shown in Figure 5. Two back walls 2 formed in a flat plate shape with one side end surface 2a rounded are installed facing each other in the approximately U-shaped opening portion formed by the two retaining wall bodies 1 so that the rounded side ends 2a abut against each other, as shown in Figure 6. As a result, the retaining wall structure, consisting of a pair of retaining wall main bodies 1 and back walls 2, which are precast materials used for retaining earth at the bent section, is installed to form a box shape.

[0038] Thereafter, the retaining wall main bodies 1 are connected to each other, the rear walls 2 are connected to each other, and the retaining wall main body 1 and the rear wall 2 are connected to each other using the connecting members as shown in Figs. 8 to 10. A cylinder 3 for drainage holes is provided in the hollow portion of this box-shaped retaining wall structure, and heavy materials such as crushed stone are laid as a filling material, or cast-in-place concrete is poured. This makes it possible to construct a retaining wall using a gravity-type retaining wall structure.

[0039] Furthermore, as shown in Figures 11 to 14, one or more L-shaped retaining walls 4 can be installed adjacent to the gravity retaining structure as a cantilever retaining wall.

[0040] In addition, for a retaining wall structure consisting of a set of the two retaining wall bodies 1 and the back wall 2 described above, one or more sets of retaining wall structures, or one or more sets of each of the retaining wall bodies 1 and the back walls 2, can be installed adjacent to each other. When multiple retaining wall structures are installed adjacent to each other, they can be installed in a bent state at any angle at each adjacent installation location, depending on the bent portion to be installed. Even when more than one set of a retaining wall main body 1 and a rear wall 2 are installed adjacent to each other in a gravity retaining wall structure, they can be installed in an arbitrarily bent state at each adjacent installation point, depending on the bent portion to be installed.

[0041] The above construction procedure makes it possible to construct a retaining wall using a gravity retaining wall structure, which not only achieves the advantages unique to precast materials, such as easy construction on site, reduced labor hours and improved work efficiency, but also reduces overall construction costs and improves quality, appearance and safety. [Explanation of symbols]

[0042] 1 Retaining wall body 1a Front wall 1b Buttress 1c Side end surface opposite to the side where the buttress is formed 2 Back wall 2a Side end surface 2b Side end surface opposite to 2a 3 cylinder 4. L-shaped retaining wall

Claims

1. A retaining wall structure used for earth retaining construction at a bent section, The retaining wall structure is It is composed of a retaining wall body and a back wall, each of which is a set of two. The main body of the retaining wall is The structure is formed in a generally L-shape in plan view from a front wall and a buttress wall. The side end of the front wall opposite the side on which the buttress is formed is rounded, The back wall is It is formed into a flat plate, One side end surface is rounded, The two retaining wall bodies are installed facing each other so that their rounded side end faces abut against each other, The two rear walls are installed facing each other so that their rounded side end faces abut against each other in the approximately U-shaped opening portion formed by the two retaining wall bodies, The two retaining wall bodies and the back wall form a box shape. A retaining wall structure characterized by:

2. A gravity retaining wall structure used for retaining earth at a bent section, Gravity retaining wall structures are: It is composed of a retaining wall body and a back wall, each of which is a set of two. The main body of the retaining wall is The structure is formed in a generally L-shape in plan view from a front wall and a buttress wall. The side end of the front wall opposite the side on which the buttress is formed is rounded, The back wall is It is formed into a flat plate, One side end surface is rounded, The two retaining wall bodies are installed facing each other so that their rounded side end faces abut against each other, The two rear walls are installed facing each other so that their rounded side end faces abut against each other in the approximately U-shaped opening portion formed by the two retaining wall bodies, The two retaining wall bodies and the back wall form a box shape. In the hollow parts of the box-shaped retaining wall structure in which the main walls of the retaining walls, the rear walls, and the main walls of the retaining walls are connected by connecting members, heavy materials such as crushed stone are laid as a filler, or in-situ concrete is poured. A gravity-type retaining wall structure.

3. A gravity retaining wall structure used for retaining earth at a bent section, Gravity retaining wall structures are: It is composed of a retaining wall body and a back wall, each of which is a set of two. The main body of the retaining wall is The structure is formed in a generally L-shape in plan view from a front wall and a buttress wall. The side end of the front wall opposite the side where the buttress is formed is rounded, The front side of the front wall is inclined so as to gradually protrude from each of the other corners toward the bottom corner of the front wall on the side where the buttress is formed, The back wall is It is formed into a flat plate, One side end surface is rounded, The two retaining wall bodies are installed facing each other so that their rounded side end faces abut against each other, The two rear walls are installed facing each other so that their rounded side end faces abut against each other in the approximately U-shaped opening portion formed by the two retaining wall bodies, The two retaining wall bodies and the back wall form a box shape. In the hollow parts of the box-shaped retaining wall structure in which the main walls of the retaining walls, the rear walls, and the main walls of the retaining walls are connected by connecting members, heavy materials such as crushed stone are laid as a filler, or cast-in-place concrete is poured. A gravity-type retaining wall structure.

4. A gravity retaining wall structure used for retaining earth at a bent section, Gravity retaining wall structures are: It is composed of a retaining wall body and a back wall, each of which is a set of two. The main body of the retaining wall is The structure is formed in a generally L-shape in plan view from a front wall and a buttress wall. The side end of the front wall opposite the side where the buttress is formed is rounded, The front side of the front wall is inclined so as to gradually protrude from each of the other corners toward the bottom corner of the front wall on the side where the buttress is formed, The back wall is It is formed into a flat plate, One side end surface is rounded, The two retaining wall bodies are installed facing each other so that their rounded side end faces abut against each other, The two rear walls are disposed in a substantially U-shaped opening formed by the two retaining wall bodies so that their rounded side end faces abut against each other, and are slidably installed in the longitudinal direction at the rear side of the buttress of the retaining wall body, The two retaining wall bodies and the back wall form a box shape. In the hollow parts of the box-shaped retaining wall structure in which the main walls of the retaining walls, the rear walls, and the main walls of the retaining walls are connected by connecting members, heavy materials such as crushed stone are laid as a filler, or cast-in-place concrete is poured. A gravity-type retaining wall structure.

5. adjacent to the retaining wall structure or gravity retaining wall structure, One or more L-shaped cantilever retaining walls are installed. A retaining wall structure or a gravity type retaining wall structure according to any one of claims 1 to 4.

6. The structure is formed in a generally L-shape in plan view from a front wall and a buttress wall. The front wall has two retaining wall bodies with rounded side end faces on the side opposite to the side on which the buttress is formed; It is formed into a flat plate, One side end surface has two rounded back walls, A retaining wall structure made of precast materials used for earth retaining work at the bend, The two retaining wall bodies and the back wall form a box shape. The two retaining wall bodies are installed facing each other so that their rounded side end faces abut against each other, The two back walls are installed facing each other in the approximately U-shaped opening formed by the two retaining wall bodies so that the rounded side end faces abut against each other, The retaining wall main bodies are connected to each other, the rear walls are connected to each other, and the retaining wall main bodies and the rear walls are connected to each other by connecting members, By filling the hollow space of the box-shaped retaining wall structure with heavy materials such as crushed stone as a filler or by pouring in-situ concrete, A method for constructing a gravity retaining wall structure, comprising: constructing a gravity retaining wall.

7. The structure is formed in a generally L-shape in plan view from a front wall and a buttress wall. The side end of the front wall opposite the side where the buttress is formed is rounded, The front side of the front wall is made up of two retaining wall bodies that are inclined so as to gradually protrude from each of the other corners toward the bottom corner on the side where the buttress is formed, It is formed into a flat plate, One side end surface has two rounded back walls, A retaining wall structure made of precast materials used for earth retaining work at the bend, The two retaining wall bodies and the back wall form a box shape. The two retaining wall bodies are installed facing each other so that their rounded side end faces abut against each other, The two back walls are installed facing each other in the approximately U-shaped opening formed by the two retaining wall bodies so that the rounded side end faces abut against each other, The retaining wall main bodies are connected to each other, the rear walls are connected to each other, and the retaining wall main bodies and the rear walls are connected to each other by connecting members, By filling the hollow space of the box-shaped retaining wall structure with heavy materials such as crushed stone as a filler or by pouring in-situ concrete, A method for constructing a gravity retaining wall structure, comprising constructing a gravity retaining wall.

8. The structure is formed in a generally L-shape in plan view from a front wall and a buttress wall. The side end of the front wall opposite the side where the buttress is formed is rounded, The front side of the front wall is made up of two retaining wall bodies that are inclined so as to gradually protrude from each of the other corners toward the bottom corner on the side where the buttress is formed, It is formed into a flat plate, One side end surface has two rounded back walls, A retaining wall structure made of precast materials used for earth retaining work at the bend, The two retaining wall bodies and the back wall form a box shape. The two retaining wall bodies are installed facing each other so that their rounded side end faces abut against each other, The two rear walls are installed in the substantially U-shaped opening formed by the two retaining wall bodies so that the rounded side end faces abut against each other, and are slidably installed in the longitudinal direction on the rear side of the buttress of the retaining wall body, The retaining wall main bodies are connected to each other, the rear walls are connected to each other, and the retaining wall main bodies and the rear walls are connected to each other by connecting members, By filling the hollow space of the box-shaped retaining wall structure with heavy materials such as crushed stone as a filler or by pouring in-situ concrete, A method for constructing a gravity retaining wall structure, comprising constructing a gravity retaining wall.

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