Retaining walls and methods for constructing them

Abstract

The object of the present invention is to provide a retaining wall and a method for constructing a retaining wall in which the strength of the support piles is improved, and to provide a retaining wall and a method for constructing a retaining wall in which the length of the H-shaped steel of the support piles is suppressed. [Solution] The retaining wall 1 of the present invention is a retaining wall that receives the horizontal component of earth pressure through wall members, and comprises: a support column portion formed in the ground; a plurality of support piles each having an H-shaped steel beam arranged inside the column portion, with a portion exposed from the column portion; and wall members arranged in a planar manner along the H-shaped steel beams of the plurality of support piles and fixed to the support piles, characterized in that the column portion includes an SRC structural area composed of a reinforcing steel cage arranged in the ground, an H-shaped steel beam arranged inside the reinforcing steel cage, and concrete in which the reinforcing steel cage and H-shaped steel beam are embedded.

Description

[Technical Field]

[0001] The present invention relates to a retaining wall and a method for constructing a retaining wall, and more particularly to a retaining wall and a method for constructing a retaining wall with improved strength of support piles. [Background technology]

[0002] A retaining wall is a wall-like structure designed and constructed to resist lateral soil pressure and prevent slope collapse when a large difference in elevation is required in the ground that exceeds the angle of repose of the soil. Conventionally, a retaining wall that minimizes the reduction of flat land for constructing a building has been proposed in Patent Document 1. The retaining wall proposed in Patent Document 1 will be described with reference to Figs. 8 and 9.

[0003] As shown in Fig. 8, this retaining wall 100 includes a plurality of support piles 20. The support piles 20 include a columnar portion 50 formed of cement milk in the ground, and an H-shaped steel 60 whose lower portion is disposed inside the columnar portion 50 and whose upper portion is exposed from the columnar portion 50.

[0004] As shown in FIG. 9, the retaining wall 100 also includes a channel steel 30 fixed to an H-shaped steel 60 by welding or the like. The channel steel 30 is a shaped steel having a web 30a, a first flange 30b formed on one end of the web 30a, and a second flange 30c formed on the other end of the web 30a. The channel steel 30 has a length equal to or less than the width of the H-shaped steel 60, and as described above, is fixed to the H-shaped steel 60 in the vertical direction by welding or the like. FIG. 8 shows the installed state of the channel steel 30. Note that in FIG. 8, the reinforcing bars 70 consisting of horizontal reinforcing bars 70a and vertical reinforcing bars 70b are not shown.

[0005] Furthermore, the retaining wall 100 includes a wall member 40. This wall member 40 is formed of so-called reinforced concrete, in which reinforcing bars 70 are embedded in concrete. The reinforcing bars 70 are made up of reinforcing bars 70a extending horizontally and arranged on the web 30a of the channel steel 30, and longitudinal reinforcing bars 70b extending vertically. Furthermore, the wall members 40 are arranged in a planar (plate-like) shape along the H-shaped steel 60 of the plurality of support piles 20, and are fixed to the support piles 20 via channel steel 30 embedded inside. In the retaining wall 100, the planar wall members 40 are configured to receive the horizontal component of earth pressure.

[0006] As such, the retaining wall 100 described in Patent Document 1 comprises a plurality of support piles 20 which act as parent piles, and the H-shaped steel 60 which constitutes the support piles 20 extends from the column-shaped portion in the ground to the wall member 40, supporting the wall member 40.

[0007] 10, Patent Document 2 shows a pile 200 in which a concrete pile 201 and a steel pile 202 are connected. In the pile 200 in which the concrete pile 201 and the steel pile 202 are connected, a connector 203 is fixed to the end of the concrete pile 201, and a base plate 204 is fixed to the end of the steel pile 202. Further, a screw hole 203a is formed in the connector 203, and a hole 204a is formed in the base plate 204 at a position opposite to the screw hole 203a. The figure shows pile 200, which connects the concrete pile 201 and the steel pile 202 via a connecting bolt 205 that screws into the screw hole 203a and the hole portion 204a, thereby integrating the concrete pile and the steel pile. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Patent No. 6940709 [Patent Document 2] Japanese Patent Application Laid-Open No. 2009-299412 Summary of the Invention [Problem to be solved by the invention]

[0009] Incidentally, when constructing the retaining wall 100 described in Patent Document 1, for example, a hole is drilled to a specified depth using a drilling auger (drill) of a construction machine, the auger is withdrawn at the same rotation as when drilling the hole, and cement milk is injected while the soil is removed outside.The H-shaped steel is then lifted up and moved to the top of the borehole and erected in the borehole so that its tip reaches the bottom of the borehole. Therefore, when constructing the retaining wall 100 of Patent Document 1, it was necessary to prepare long H-shaped steel beams whose length was the sum of the depth of the borehole and the height of the wall members. Furthermore, since the H-shaped steel beams are formed to a predetermined length, if the length exceeded the predetermined length, the H-shaped steel beams had to be connected by welding, bolts, etc. to make them longer.

[0010] Such long H-shaped steel is expensive, and the cost of connecting the H-shaped steel by welding, bolts, etc. is also high. Therefore, there is a problem in that the cost of constructing the retaining wall 100 is also high. Furthermore, the columnar part of the support pile is made of cement milk, which holds the H-shaped steel beams erected in the borehole, but there was an issue that this cement milk has weak mechanical strength.

[0011] When using the support pile 200 consisting of a concrete pile 201 and a steel pile 202 of Patent Document 2, it is necessary to connect the concrete pile 201 and the steel pile 202 via a connecting bolt 205 that is screwed into the screw hole 203a and the hole portion 204a. Furthermore, since the wall member is arranged in a planar (plate-like) shape along the flange 202a of the steel pile (H-shaped steel) 202, the steel pile 202 must be connected to the concrete pile 201 so that the flange 202a of the steel pile (H-shaped steel) 202 is parallel to the wall member 40. For this reason, the steel piles 202 must be attached to the concrete piles 201 with high precision while taking into consideration the placement of the steel piles 202, which poses a problem of poor work efficiency. Furthermore, there was a problem that the piles were discontinuous at the connection portion between the concrete pile 201 and the steel pile 202, resulting in a weakened strength.

[0012] The present inventors, with the aim of improving the support piles described in Patent Document 1, first conducted extensive research into retaining walls with improved mechanical strength of the columnar portions of the support piles. Subsequently, they conducted extensive research into retaining walls that minimize the use of long H-shaped steel beams. As a result, they came up with a new structure for the columnar portions of the support piles, which led to the completion of the present invention.

[0013] The present invention has been made in consideration of the above circumstances, and aims to provide a retaining wall and a method for constructing the same in which the strength of the support piles is improved, and in which the length of the H-shaped steel of the support piles is suppressed. [Means for solving the problem]

[0014] The retaining wall according to the present invention, which has been made to solve the above-mentioned problems, is a retaining wall formed in the ground, which receives the horizontal component of earth pressure by wall members. Columnar part and a plurality of support piles each having an H-shaped steel beam arranged inside the column-shaped portion and a portion of which is exposed from the column-shaped portion; and wall members arranged in a plane along the H-shaped steel beams of the plurality of support piles and fixed to the support piles, wherein the column-shaped portion includes an SRC structural area constituted by a reinforcing steel cage arranged in the ground, the H-shaped steel beam arranged in the reinforcing steel cage, and concrete in which the reinforcing steel cage and the H-shaped steel beam are embedded, The wall member is an SRC structure composed of H-shaped steel exposed from the column-like portion, beam members arranged perpendicular to the axis of the H-shaped steel and connected to the H-shaped steel, reinforcing bars arranged in the horizontal and vertical directions of the wall member, and concrete in which the H-shaped steel, the beam members, and the reinforcing bars are embedded, and the column-like portion and the wall member are integrated as an SRC structure. It states that:

[0015] As such, the columnar portion of the retaining wall of the present invention is a so-called SRC structure (short for Steel Reinforced Concrete), in which H-shaped steel is placed inside a reinforcing bar cage, and therefore has greater strength than conventional columnar portions made of milk cement and H-shaped steel.

[0016] Here, it is desirable that the reinforcing bar cage is arranged from the lower end to the upper end of the column portion, the H-shaped steel is arranged in the range from at least the middle part to the upper end of the column portion, and the range from at least the middle part to the upper end of the column portion is an SRC structural area. It is desirable from the viewpoint of strength that the entire column be made of SRC structure, but making the entire column be made of SRC structure results in the length of the H-shaped steel. Therefore, at least the range from the middle to the upper end of the column may be made of SRC structure, and the column from the lower end to the middle may be made of RC (Reinforced Concrete) structure without H-shaped steel. Even in this case, the strength is improved compared to conventional column sections made of milk cement and H-shaped steel, while the length of the H-shaped steel can be prevented from increasing, thereby preventing increases in construction costs.

[0017] Furthermore, it is desirable that the length of the H-shaped steel arranged in the reinforcing bar cage be equal to or greater than the height of the wall member. In this way, the H-shaped steel is placed in the reinforcing bar cage with a length dimension equal to or greater than the height dimension of the wall member, which makes it possible to prevent the wall member from tilting.

[0018] It is also desirable that the diameter of the columnar portion is equal to or greater than the width of the wall member in the front-rear direction. In this way, since the diameter of the columnar portion is equal to or greater than the width dimension of the wall member in the front-rear direction, the wall member can be stably supported.

[0019] It is also preferable that the wall member is an SRC structure made up of H-shaped steel exposed from the column portion, reinforcing bars, and concrete in which the H-shaped steel and reinforcing bars are embedded. In this way, if not only the columnar portions but also the wall members are made of SRC structure, the strength of the entire retaining wall is improved.

[0020] The method of constructing a retaining wall according to the present invention, which has been made to solve the above-mentioned problems, comprises the steps of: installing a reinforcing bar cage in a hole bored by an excavation drill; pouring ready-mixed concrete into the hole in which the reinforcing bar cage has been installed, subsequently suspending an H-shaped steel beam to a predetermined position in the reinforcing bar cage, and installing the H-shaped steel beam in the reinforcing bar cage; or suspending the H-shaped steel beam to a predetermined position in the reinforcing bar cage, subsequently pouring ready-mixed concrete, and installing the H-shaped steel beam in the reinforcing bar cage; propping a portion of the H-shaped steel beam into the reinforcing bar cage, and forming a support pile using the reinforcing bar cage, the H-shaped steel beam, and the concrete; and removing the exposed H-shaped steel beam from the support pile. A beam member is connected to the H-shaped steel so that it is perpendicular to the axis of the beam. Reinforcement bars are further arranged in the horizontal and vertical directions, and the H-shaped steel, the beam member, and the reinforcing bars are and a step of embedding the wall member inside the support pile with concrete and fixing the wall member to the support pile.

[0021] Here, in the step of forming the wall member, it is preferable to arrange reinforcing bars and embed the exposed H-shaped steel and the reinforcing bars inside with concrete to form the wall member. [Effects of the Invention]

[0022] According to the present invention, it is possible to obtain a retaining wall and a method for constructing a retaining wall that improves the strength of the support piles, and it is also possible to obtain a retaining wall and a method for constructing a retaining wall that suppresses the increase in the length of the H-shaped steel of the support piles. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 1 is a front view of a retaining wall according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view taken along line II in FIG. [Figure 3] FIG. 3 is a cross-sectional view taken along line II-II of FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line III-III in FIG. [Figure 5] FIG. 5 is a diagram showing a reinforcing bar cage according to the first embodiment. [Figure 6] FIG. 6 is a cross-sectional view showing the upper part of the retaining wall of the second embodiment. [Figure 7]FIG. 7 is a cross-sectional view showing the lower part of the retaining wall and the columnar part of the support pile in the second embodiment. [Figure 8] FIG. 8 is a front view of a conventional retaining wall. [Figure 9] FIG. 9 is a cross-sectional view showing a portion of the retaining wall of FIG. [Figure 10] FIG. 10 is a perspective view showing another conventional example. DETAILED DESCRIPTION OF THE INVENTION

[0024] An embodiment of a retaining wall according to the present invention will be described with reference to Figures 1 to 5. Note that the figures show one embodiment of the retaining wall structure, and the present invention is not limited to this embodiment.

[0025] As shown in FIGS. 1 to 5, a retaining wall 1 includes support piles 2 and wall members 3 supported by the support piles 2. As shown in Figures 1 and 2, the support pile 2 comprises a columnar portion 6 formed in the ground and an H-shaped steel 5 whose lower portion is disposed inside the columnar portion 6 and whose upper portion is exposed from the columnar portion 6. This columnar portion 6 has a columnar portion 6a made of reinforced concrete (RC structure (Reinforced Concrete)) formed from a reinforcing steel cage 4 and concrete C, and a columnar portion 6b made of steel-framed reinforced concrete (SRC structure (Steel Reinforced Concrete)) formed from the reinforcing steel cage 4, the H-shaped steel 5 and concrete C, with an H-shaped steel 5 placed in the center of the reinforcing steel cage 4.

[0026] The columnar portion 6 is fixed in the ground at the construction site by a ready mixed concrete method and the base is reinforced, and the support pile 2 (H-shaped steel 5) is installed so that its axis is vertical. This ready-mix concrete is soft concrete that is mixed at the factory but delivered to the construction site before hardening.

[0027] The columnar portion 6 is formed by hoisting the reinforcing bar cage 4 into the borehole and then lowering it, and then lowering the H-shaped steel 5 so that the tip of the H-shaped steel 5 is positioned halfway into the borehole, and pouring concrete C. As a result, the columnar portion 6 is formed into a columnar portion 6a formed by the reinforcing bar cage 4 and the concrete C, and a columnar portion 6b formed by the reinforcing bar cage 4, the H-shaped steel 5, and the concrete C. Therefore, the lower part of the H-shaped steel 5 is positioned within at least a part of the interior of the columnar portion 6 (columnar portion 6b), and the upper part of the H-shaped steel 5 is exposed from the columnar portion 6, fixing and supporting the wall member 3.

[0028] As shown in Fig. 5, the reinforcing bar cage 4 is formed into a cylindrical shape as a whole. The outer diameter of the reinforcing bar cage 4 is set smaller than the diameter of the borehole so that it can be installed inside the borehole. The inner diameter of the reinforcing bar cage 4 is set to a length dimension that allows an H-shaped steel 5 to be placed in the center of the reinforcing bar cage 4. Furthermore, the length of the reinforcing bar cage 4 is set to be approximately the same as the depth of the borehole so that it can be placed throughout the entire borehole. Specifically, as shown in Figure 5, the reinforcing bar cage 4 has multiple reinforcing bars 4b arranged on the circumference, each extending linearly, and multiple ring-shaped reinforcing bars 4a arranged in the axial direction of the reinforcing bars 4b to surround the reinforcing bars 4b, and the reinforcing bars 4a and the reinforcing bars 4b are welded and fixed together.

[0029] 3, the columnar portion 6b is formed by arranging the H-shaped steel 5 at the center of the reinforcing bar cage 4, and embedding the reinforcing bar cage 4 and the H-shaped steel 5 in concrete C. Therefore, the columnar portion 6b has a so-called steel-framed reinforced concrete structure (SRC (Steel Reinforced Concrete)).

[0030] On the other hand, as shown in FIG. 4, the column portion 6a has no H-shaped steel 5 arranged therein, and only the reinforcing bar cage 4 arranged therein. Then, the reinforcing cage 4 is buried in the concrete C to form the pillar portion 6a, and the pillar portion 6a becomes a reinforced concrete structure (RC (Reinforced Concrete)).

[0031] In this way, this columnar portion 6 has an area (columnar portion 6b) where the H-shaped steel 5 is placed inside the reinforcing bar cage 4, and this area has an SRC structure (short for Steel Reinforced Concrete), which further improves its strength. Furthermore, in the region where the H-shaped steel 5 is not arranged (columnar portion 6a), the reinforcing bar cage 4 is arranged, forming an RC (reinforced concrete) structure, which further improves the strength.

[0032] Considering the strength of the support pile 2, it is desirable to arrange H-shaped steel 5 also in the columnar portion 6a, and to make the entire support pile 2 an SRC (Steel Reinforced Concrete) structure. However, if the H-shaped steel 5 is also arranged in the column portion 6a, the H-shaped steel will become longer. Therefore, by arranging the H-shaped steel 5 only in the column portion 6b without arranging the H-shaped steel 5 in the column portion 6a, it is possible to prevent the H-shaped steel from becoming longer. As a result, the cost of the H-shaped steel can be reduced, and the work required to lengthen the H-shaped steel 5 can be suppressed, thereby reducing the overall construction costs. In addition, in the present invention, in order to obtain a retaining wall and a method for constructing a retaining wall with improved strength of the support piles, as described above, it is preferable to arrange H-shaped steel 5 in the columnar portion 6a and the support portion 6b as well, and make the entire support pile 2 an SRC structure (Steel Reinforced Concrete).

[0033] Furthermore, when H-shaped steel 5 is arranged only on columnar portion 6b, it is desirable that the tip of H-shaped steel 5 in reinforcing bar cage 4 is installed at a depth from the upper end of said reinforcing bar cage 4 that is equal to or greater than the height of said wall member 3. In other words, it is desirable that the length of columnar portion 6b is formed to be equal to or greater than the height of said wall member 3. In this way, since the wall member 3 is supported by the columnar portions 6b of the SRC structure having a length equal to or greater than the height of the wall member 3, it is possible to prevent the wall member 3 from tilting.

[0034] As shown in Figures 1 and 2, the wall member 3 is arranged in a plane along the H-shaped steel 5 of the plurality of support piles 2. As shown in Figure 1, the plurality of support piles 2 are installed in parallel at predetermined intervals along the wall surface of the wall member 3 to be formed. The interval L1 between the support piles 2 is, for example, 2000 mm. The wall member 3 is made of reinforced concrete (RC structure (Reinforced Concrete)) with the inside reinforced with steel bars (not shown), and is fixed to the support piles 2. Taking into consideration the H-shaped steel 5 of the support piles 2, the wall member 3 can also be said to be made of steel-framed reinforced concrete (SRC structure (Steel Reinforced Concrete)).

[0035] The H-shaped steel 5 is a shaped steel manufactured by hot rolling, and as shown in FIG. 3, has a web 5a and two flanges 5b and 5c that are parallel to each other. The H-shaped steel 5 is installed so that the plate surfaces of the flanges 5b and 5c are parallel to the wall surface of the wall member 3, as shown in FIG. Standard products based on JIS (Japanese Industrial Standards) or the like are used for the H-shaped steel 5. Note that a plurality of H-shaped steels 5 may be connected in the axial direction in one support pile 2. The H-shaped steels 5 can be joined together by, for example, high-strength bolts.

[0036] 1 and 2, a beam member 7 is provided at the upper end of the wall member 3 to connect the H-shaped steel beams 5 that make up the support piles 2. Note that reinforcing bars are omitted from the illustration in FIGS. 1 and 2. A beam member 8 having the same configuration as the beam member 7 is provided at the lower end of the wall member 3. Note that a beam member may also be provided in the middle of the wall member 3. By providing the beam members 7, 8 at the upper and lower ends of the wall member 3 in this way, the strength of the wall member 3 can be increased, and the wall can be prevented from collapsing.

[0037] For example, H-shaped steel, I-shaped steel, T-shaped steel, angle steel (isolateral angle steel), channel steel, or other steel materials conforming to JIS standards can be used as the beam members 7 and 8, with H-shaped steel being preferred. The beam members 7 and 8 are fixed to the H-shaped steel 5 by welding or with bolts. Considering the beam members 7 and 8, the wall member 3 can be said to be made of steel-framed reinforced concrete (SRC structure) consisting of reinforcing bars arranged inside the wall, the beam members 7 and 8, and concrete. In addition, anchors may be driven (installed) into the parts where the H-shaped steel 5 and the beam member 7 are connected to reinforce the retaining wall.

[0038] As described above, the wall member 3 is in contact with the soil and receives the horizontal component of earth pressure. The wall surface of the wall member 3 is formed perpendicular to the horizontal plane, as shown in Figures 1 and 2. The thickness of the wall member 3 is determined depending on the earth pressure that the wall member 3 receives.

[0039] Next, another embodiment of the retaining wall according to the present invention will be described with reference to FIGS. This embodiment is characterized in that it has a wall head portion 3A that is provided at the rear and wide at the upper end of the wall member 3, as shown in Figure 6, and a wall foot portion 3B that is provided at the rear and wide at the lower end of the wall member 3, as shown in Figure 7.

[0040] In the wall head portion 3A, a beam member 9 is fixed by welding or bolts to the upper end of the H-shaped steel 5. The beam member 9 corresponds to the beam member 7 in the first embodiment and is formed of an H-shaped steel. At this time, the beam members 9 are fixed to the flanges 5c of the H-shaped steels 5 so that the axis of the beam members 9 is perpendicular to the axis of each H-shaped steel 5. The beam members 9 are also fixed so that the center lines connecting the respective H-shaped steels 5 are linear. Stirrups 11, horizontal reinforcing bars 12, and vertical reinforcing bars 12b are provided to surround the H-shaped steel 5 and beam member 9, thereby reinforcing the wall head 3A.

[0041] As shown in Fig. 7, in the wall base 3B, a beam member 10 is fixed by welding or bolts to the lower end of the H-shaped steel 5. The beam member 10 corresponds to the beam member 8 in the first embodiment and is made of an H-shaped steel. At this time, the beam members 10 are fixed to the flanges 5c of the H-shaped steels 5 so that the axis of the beam members 10 is perpendicular to the axis of each H-shaped steel 5. The beam members 10 are also fixed so that the center lines connecting the respective H-shaped steels 5 are linear. Stirrups 13, horizontal reinforcing bars 14a, and vertical reinforcing bars 14b are provided to surround the H-shaped steel 5 and beam member 10, thereby reinforcing the wall head 3B.

[0042] In this way, the wall member 3 is provided with the wall head portion 3A and the wall foot portion 3B, which improves the strength of the wall member 3. In particular, when the wall foot portion 3B is provided, the stability of the wall member 3 with respect to the ground is improved.

[0043] Also, as shown in Fig. 7, the diameter of the columnar portion is set to be equal to or greater than the width dimension of the wall member in the front-rear direction. That is, as shown in Fig. 7, the outer peripheral side surface of columnar portion 6b is formed to protrude from the outer peripheral side surface of wall member 3 (wall foot portion 3B). Fig. 7 shows a state in which the outer peripheral side surface of columnar portion 6b protrudes by length dimension T from wall member 3 (wall foot portion 3B). In this way, since the diameter of the columnar portion 6b is formed to be greater than the width dimension of the wall member 3 in the front-to-rear direction, the wall member 3 can be prevented from tilting forward, and the stability of the wall member 3 relative to the ground is improved.

[0044] (Construction method of retaining wall 1) Next, a method for constructing a retaining wall according to this embodiment will be described. The support piles 2 are constructed on-site using the common earth drilling method. First, an earth drilling machine is used to rotate the drilling basket down to the supporting layer of the ground, and the piles are excavated to the target point while removing any soil generated during excavation. Then, a cylindrical reinforcing bar cage 4 is lowered to the bottom of the excavation hole. After the reinforcing bar cage 4 is installed, fresh concrete is poured into the hole using a tremie pipe, and then the H-shaped steel 5 is hung down to the specified position, lowered, fixed in place, and the concrete is poured in to harden the support pile, thereby constructing the support pile. Alternatively, the H-shaped steel 5 may first be hung up to a predetermined position, lowered, and fixed in place, and then concrete may be poured into the hole using a tremie pipe, and the concrete may be hardened to form a support pile.

[0045] When the H-shaped steel 5 is lifted up, moved to the top of the borehole, and installed in the borehole, another H-shaped steel other than the H-shaped steel 5 to be installed is placed horizontally on the ground of the borehole. It is preferable to use this H-shaped steel placed on the ground as a ruler to fix the lifted H-shaped steel 5 and install it. In this way, the H-shaped steel placed on the ground can prevent the H-shaped steel 5 to be installed from falling over and falling out of the borehole.

[0046] After the erection of the plurality of support piles 2 is completed, the beam member 7 is fixed to the upper end of the H-shaped steel 5 by welding or bolts. At this time, the beam member 7 is fixed to the upper end of the H-shaped steel 5 so that the axis of the beam member 7 is perpendicular to the axis of each H-shaped steel 5. Similarly, the beam members 8 are fixed by welding or bolts to the lower ends of the H-shaped steels 5. At this time, the beam members 8 are fixed to the lower ends of the H-shaped steels 5 so that the axis of the beam members 8 is perpendicular to the axis of each of the H-shaped steels 5. Furthermore, the beam members 7 and 8 are fixed to the H-shaped steel 5 so that the center lines connecting the respective H-shaped steels 5 form a straight line.

[0047] Next, reinforcing bars are placed to provide reinforcing members for the wall member 3. Next, the concrete portion of the wall member 4 is formed. The wall member 4 is formed using cast-in-place concrete. That is, formwork is erected, concrete is poured, and the formwork is removed after the required concrete strength is ensured. This completes the retaining wall 1 structure, in which the wall member 4 is integrated with the support piles 2. This completes the wall member 3, in which the reinforcing bars and beam members 7 and 8 are embedded inside with concrete.

[0048] To form the wall head 3A and wall base 3B, the beam members 9 and 10 are fixed to the H-shaped steel 5 by welding or bolts, and when reinforcing bars are arranged for the support piles 2 as described above, the stirrups 11 and 13, the horizontal reinforcing bars 12a and 14a, and the vertical reinforcing bars 12b and 14b are arranged, and the concrete portion of the wall member 3 is formed by poured-in-place concrete as described above. As a result, the structure of the retaining wall 1 is completed, in which the wall member 3 having the wall head portion 3A and the wall foot portion 3B is integrated with the support pile 2. [Explanation of symbols]

[0049] 1. Retaining wall 2 Support pile 3 Wall components 4 Reinforced Concrete Cage 5 H-shaped steel 6 Columnar part 6a Reinforced concrete cage, column 6b Columns made of H-shaped steel, reinforcing bars, and concrete 7 Beam members 8 Beam members 9 Beams (H-shaped steel) 10 Beam member (H-shaped steel) 11 Stirrups 12a Horizontal reinforcing bars 12b Longitudinal reinforcing bars 13 Stirrups 14a Horizontal reinforcing bars 14b Longitudinal reinforcing bars C. Concrete

Claims

1. A retaining wall that receives a horizontal component of earth pressure by wall members, A plurality of support piles each having a columnar portion formed in the ground and an H-shaped steel beam arranged inside the columnar portion and partially exposed from the columnar portion; A wall member arranged in a planar manner along the H-shaped steel of a plurality of support piles and fixed to the support piles; Equipped with The column portion includes an SRC structural area configured by a reinforcing bar cage placed in the ground, an H-shaped steel placed in the reinforcing bar cage, and concrete in which the reinforcing bar cage and the H-shaped steel are embedded, The wall member is an SRC structure composed of H-shaped steel exposed from the column portion, beam members arranged perpendicular to the axis of the H-shaped steel and connected to the H-shaped steel, reinforcing bars arranged in the horizontal and vertical directions of the wall member, and concrete in which the H-shaped steel, the beam members, and the reinforcing bars are embedded, A retaining wall characterized in that the columnar portion and the wall member are integrated as an SRC structure.

2. The reinforcing bar cage is arranged from the lower end to the upper end of the column portion, The H-shaped steel is arranged in a range from at least the middle part to the upper end part of the column part, A retaining wall as described in claim 1, characterized in that at least the range from the middle to the upper end of the columnar portion is an SRC structural area.

3. The reinforcing bar cage is arranged from the lower end to the upper end of the column portion, The H-shaped steel is arranged in a range from the middle part to the upper end part of the column part, A retaining wall as described in claim 1, characterized in that the range from the lower end to the middle part of the column-shaped portion is an RC structural area composed of a reinforcing bar cage placed in the ground and concrete in which the reinforcing bar cage is buried.

4. 2. The retaining wall according to claim 1, wherein the length of the H-shaped steel arranged in the reinforcing bar cage is equal to or greater than the height of the wall member.

5. 2. The retaining wall according to claim 1, wherein the diameter of the columnar portion is equal to or greater than the width dimension in the front-to-rear direction of the wall member.

6. In the method for constructing a retaining wall according to any one of claims 1 to 5, a step of placing a reinforcing bar cage in a hole drilled by an excavation drill; a step of pouring fresh concrete into the drilled hole in which the reinforcing bar cage is installed, then suspending an H-shaped steel to a predetermined position in the reinforcing bar cage and installing the H-shaped steel in the reinforcing bar cage, or suspending an H-shaped steel to a predetermined position in the reinforcing bar cage, then pouring fresh concrete and installing the H-shaped steel in the reinforcing bar cage; a step of erecting a part of the H-shaped steel in the reinforcing steel cage and forming a support pile using the reinforcing steel cage, the H-shaped steel, and the concrete; a step of connecting a beam member to the H-shaped steel so that the beam member is perpendicular to the axis of the exposed H-shaped steel of the support pile, further arranging reinforcing bars in the horizontal and vertical directions, and burying the H-shaped steel, the beam member, and the reinforcing bars inside with concrete to form a wall member fixed to the support pile; A method for constructing a retaining wall, comprising:

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