Retaining wall

Abstract

To provide a retaining wall capable of reinforcing the strength of a wall member as a surface and reliably supporting the horizontal component of earth pressure for a long period of time.SOLUTION: A retaining wall 1 of The present invention comprises a wall head 4a, a wall foot 4b and a wall main body 4c of a wall member 4. The wall head 4a and the wall foot 4b are formed at upper and lower ends of a portion of an exposed H-shaped steel 6 corresponding to the wall member 4, and the H-shaped steel 6, a channel steel 3, horizontal reinforcing bars 7a and vertical reinforcing bars 7b are embedded in concrete within the wall head 4a and the wall foot 4b. The wall main body 4c is formed as the wall member 4 integrally with the wall head 4a and the wall foot 4b, and is formed between the upper and lower ends of the portion of the exposed H-shaped steel 6 corresponding to the wall member 4. The channel steel 3, the horizontal reinforcing bars 7a and the vertical reinforcing bars 7 are embedded in concrete within the wall main body 4c.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a retaining wall.

Background Art

[0002] A retaining wall is a wall-like structure designed and constructed to prevent the collapse of a slope against the lateral pressure of soil when a large height difference exceeding the angle of repose of the soil is to be provided on the ground. Patent Document 1 proposes a retaining wall that minimizes the flat land required for building a building. This retaining wall will be described with reference to FIGS. 13 and 14.

[0003] As shown in FIG. 13, this retaining wall 100 includes a plurality of support piles 20. The support pile 20 includes a columnar portion 50 formed by cement milk in the ground, and an H-shaped steel 60 having a lower portion disposed inside the columnar portion 50 and an upper portion exposed from the columnar portion 50.

[0004] Also, as shown in FIG. 14, this retaining wall 100 includes a channel steel 30 fixed to the H-shaped steel 60 by welding or the like. The channel steel 30 is a shaped steel including a web 30a, a first flange 30b formed on one end side of the web 30a, and a second flange 30c formed on the other end side of the web 30a.

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

[0006] In this way, in the retaining wall 100, the channel steel 30, the horizontal reinforcing bars 70a, and the vertical reinforcing bars 70b are embedded in the wall member 40, and the wall member 40 is fixed to the support pile 20 via the channel steel 30, so that the support pile 20 and the wall member 40 are integrated into a composite structure. And the wall member 40 receives the force of the horizontal component of the earth pressure. The force of the horizontal component of this earth pressure is transmitted to the H-shaped steel 60 at the upper part of the support pile 20 via the channel steel 30 and then transmitted to the lower part of the support pile 20, and the wall member 40 resists the lateral pressure of the soil to prevent the slope from collapsing.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] According to the retaining wall 100 proposed in this Patent Document 1, since the support pile 20 is provided vertically and the planar (plate-shaped) wall member 40 is formed along the support pile 20, it is possible to prevent the slope from collapsing against the lateral pressure of the soil. However, in the retaining wall 100 proposed in Patent Document 1, since the wall member 40 is so-called reinforced concrete, the strength of the wall member 40 cannot be said to be sufficient, and there is a risk of deformation, fracture such as shear fracture, overturning, and settlement due to earth pressure. In addition, since the wall member 40 is formed in a planar (plate-shaped) shape, there is a risk of heaping and consolidation slip.

[0009] Also, in the retaining wall 100 proposed in Patent Document 1, the first flange 30b of the channel steel 30 is fixed to the H-shaped steel 60 by welding or the like. And it is confirmed by impact inspection whether the channel steel 30 is fixed to the H-shaped steel 60. However, when performing an impact inspection by hitting the second flange 30c of the channel steel 30 with a hammer, when the hammer hits the tip of the second flange 30c, the hammer may flow laterally. And there is a risk that this flowing hammer may hit the operator, posing a danger during work.

[0010] In addition, the wall member 40 of the retaining wall 100 proposed in Patent Document 1 is formed in a single planar (plate-like) shape. Therefore, for example, as shown in FIG. 15, when the land for constructing a building has slopes X and Y in two adjacent directions, in the retaining wall 100 proposed in Patent Document 1, it is necessary to separately form the wall members 40X and 40Y on the slopes in the two directions. That is, since the wall member 40 is formed as separate wall members 40X and 40Y and fixed to separate support piles 20X and 20Y, there is a problem that a large strength cannot be obtained compared to the case where the wall members are connected and integrated with each other.

[0011] The present invention has been made in view of the above circumstances, and an object thereof is to provide a retaining wall that can make the strength of the wall member larger and reliably support the horizontal component of the earth pressure over a long period of time.

Means for Solving the Problem

[0012] In order to solve the above problems, the retaining wall according to the present invention is a retaining wall that receives the horizontal component of the earth pressure by a wall member, and includes a plurality of support piles having columnar portions formed by cement milk in the ground, and H-shaped steels having lower portions disposed inside the columnar portions and upper portions exposed from the columnar portions, a plurality of channel steels fixed to the outer and inner surfaces of the upper and lower end portions of the portion corresponding to the wall member of the H-shaped steel, and also fixed to the outer surface between the upper and lower end portions of the portion corresponding to the wall member of the H-shaped steel, horizontal reinforcing bars disposed on the upper surface of the channel steel and extending in the lateral direction, vertical reinforcing bars disposed along the axis of the H-shaped steel and extending in the vertical direction, wall head portions and wall foot portions formed at the upper and lower end portions of the portion corresponding to the wall member of the H-shaped steel, and burying the H-shaped steel, the channel steel, the horizontal reinforcing bars, and the vertical reinforcing bars inside with concrete, and a wall main body portion formed integrally with the wall head portions and the wall foot portions as the wall member, and burying the channel steel, the horizontal reinforcing bars, and the vertical reinforcing bars inside with concrete between the upper and lower end portions of the portion corresponding to the wall member of the H-shaped steel.

[0013] According to such a configuration, the wall main body portion of the wall member is a so-called reinforced concrete structure (RC structure) in which channel steel, horizontal reinforcing bars, and vertical reinforcing bars are buried inside with concrete. Further, the wall head portions and the wall foot portions formed above and below the wall main body portion of the wall member are SRC structures in which H-shaped steel, channel steel, and reinforcing bars are buried in concrete, and function as a strong beam structure. Therefore, the strength of the wall member is significantly improved, and the occurrence of distortion, destruction such as shear failure, overturning, and settlement due to earth pressure can be suppressed in the wall member.

[0014] Thus, in the retaining wall according to the present invention, the strength of the wall member can be made larger, and it can reliably support the horizontal component of the earth pressure over a long period of time.

[0015] Here, it is preferable that the wall head portions and the wall foot portions have a shape protruding inward from the wall main body portion, the wall head portions are formed to have a larger length in the width direction than the wall main body portion, and the wall foot portions are formed to have a larger length in the width direction than the wall main body portion. As described above, in the wall head and the wall foot, the channel steel is fixed to the outer and inner sides of the H-shaped steel, and in the wall main body, the channel steel is fixed to the outer side of the H-shaped steel. Therefore, the wall head and the wall foot are larger in length in the width direction (front-rear direction of the wall) than the thickness of the wall main body of the wall member. That is, the wall head and the wall foot are shaped to protrude inward from the wall main body of the wall member. In particular, since the lower surface of the wall foot of the wall member has a surface shape (bottom surface shape) that is larger in length in the width direction (front-rear direction of the wall) than the thickness of the wall main body of the wall member, it is possible to further prevent the occurrence of settlement, heaping, and consolidation slip.

[0016] Further, in the wall head and the wall foot, first stirrups are respectively provided at the upper and lower ends so as to surround the transverse reinforcing bars arranged in the channel steel fixed to the outer and inner sides of the upper and lower ends of the portion of the H-shaped steel corresponding to the wall member. It is desirable that the H-shaped steel, the channel steel, the transverse reinforcing bars, the longitudinal reinforcing bars, and the first stirrups are embedded inside with concrete at the upper and lower ends of the portion of the H-shaped steel corresponding to the wall member. In this way, by providing the first stirrups, the strength of the wall member is further improved, and the occurrence of breakages such as deformation and shear failure due to earth pressure can be further suppressed in the wall member.

[0017] Further, it is desirable that the channel steel is a grooved steel, one surface of the grooved steel is joined to the H-shaped steel, and in side view, the grooved steel is attached to the H-shaped steel in an L shape. In this way, since the grooved steel is attached to the H-shaped steel in an L shape in side view, it is easy to arrange the transverse reinforcing bars on the upper surface of the grooved steel. Also, when the grooved steel is a grooved steel and the grooved steel is attached to the H-shaped steel in an L shape, when performing an impact inspection, as shown in Patent Document 1, since the second flange of the grooved steel does not protrude, it is easy to hit the grooved steel with a hammer, and the hammer hits the tip of the second flange and flows horizontally, It is possible to avoid the risk of hitting the operator.

[0018] In addition, at least two of the channel steels are provided vertically on the outer and inner surfaces of the upper and lower ends of the portion corresponding to the wall member in the H-shaped steel, and first stirrups are respectively arranged at the upper and lower ends so as to surround the horizontal reinforcing bars arranged in at least two of the channel steels fixed to the outer and inner surfaces of the upper and lower ends of the portion corresponding to the wall member of the H-shaped steel. It is preferable to have. In this way, at least two of the channel steels are respectively provided vertically on the outer and inner surfaces of the upper and lower ends, and the first stirrups are provided so as to surround the entire horizontal reinforcing bars arranged in the channel steels. Therefore, the strength of the upper end portion (wall head portion) and the lower end portion (wall foot portion) of the wall member can be further improved.

[0019] Furthermore, it is desirable that a plurality of the first stirrups are provided at predetermined intervals between the H-shaped steels. When the first stirrups are provided close to the vertical reinforcing bars, the first stirrups are bundled with the vertical reinforcing bars and the horizontal reinforcing bars. When the first stirrups are not provided close to the vertical reinforcing bars, it is desirable that the first stirrups be bundled with the horizontal reinforcing bars and the width-stop bars bundled with the horizontally arranged reinforcing bars arranged vertically. According to such a configuration, the strength of the upper end portion (wall head portion) and the lower end portion (wall foot portion) of the wall member can be further improved.

[0020] In addition, second stirrups respectively arranged at the upper and lower ends so as to surround the entire horizontal reinforcing bars arranged in the channel steel fixed to the outer surface side of the H-shaped steel facing the outer surface side of the H-shaped steel, and facing the inner surface side of the H-shaped steel. Third stirrups respectively arranged at the upper and lower ends so as to surround the entire horizontal reinforcing bars arranged in the channel steel fixed to the inner surface side of the H-shaped steel are preferably provided. According to such a configuration, the strength of the upper end portion (wall head portion) and the lower end portion (wall foot portion) of the wall member can be further improved.

[0021] Further, a plurality of the second and third rib portions are provided at a predetermined interval facing the H-shaped steel, respectively. When the second and third rib portions are provided close to the longitudinal reinforcing bars, the second and third rib portions are bundled with the longitudinal and transverse reinforcing bars. When the second and third rib portions are not provided in contact with the longitudinal reinforcing bars, it is desirable that the second and third rib portions be bundled with the transverse reinforcing bars. According to such a configuration, the strength of the upper end portion (wall head portion) and the lower end portion (wall foot portion) of the wall member can be further improved.

[0022] Also, a plurality of the wall members that are linear in plan view may be provided, and the plurality of wall members may be connected at a predetermined intersection angle and formed as an integrated wall member. Thus, when a plurality of the wall members are connected at a predetermined intersection angle and formed as an integrated wall member, greater strength can be obtained compared to the case where the wall members are formed as separate wall members. Further, a connecting member for connecting the H-shaped steels constituting the support piles may be provided at the wall head portion.

Advantages of the Invention

[0023] According to the present invention, it is possible to provide a retaining wall that can make the strength of the wall member greater and reliably support the horizontal component of the earth pressure over a long period of time.

Brief Description of the Drawings

[0024]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Mode for Carrying Out the Invention

[0025] (First Embodiment) Hereinafter, embodiments of the retaining wall according to the present invention will be described with reference to the drawings. Note that FIG. 1 is a front view of the retaining wall according to the first embodiment of the present invention, and FIG. 2 is a plan view of the retaining wall of FIG. 1. Further, FIG. 3 is a partial sectional view of the upper part of the retaining wall of the I-I section of FIG. 2, and FIG. 4 is a partial sectional view of the lower part of the retaining wall of the I-I section of FIG. 2. Further, FIG. 5 is a partial sectional view of the upper part of the retaining wall of the II-II section of FIG. 2. Note that the figure shows one embodiment of the structure of the retaining wall, and the arrangement interval, the number of arrangements, etc. of the reinforcing bars can be appropriately changed, and the present invention is not limited to this embodiment.

[0026] (Schematic Configuration of Retaining Wall 1) As shown in FIGS. 1 to 4, the retaining wall 1 includes support piles 2, channel steel 3, and wall members 4. The retaining wall 1 according to the present invention is characterized in that, as shown in FIG. 1, a wall head 4a and a wall foot 4b are provided above and below the wall main body 4c of the wall member 4.

[0027] As shown in FIGS. 3 and 4, channel steel 3 is provided on the wall head 4a and the wall foot 4b. The channel steel 3 is fixed to the outer and inner surfaces of the upper end (wall head 4a) and the lower end (wall foot 4b) of the portion corresponding to the wall member 4 of the H-shaped steel 6. Incidentally, the channel steel 3 is also provided on the outer surface between the upper end (wall head 4a) and the lower end (wall foot 4b) of the portion corresponding to the wall member of the H-shaped steel. And, on the upper surface of the channel steel 3, a horizontal reinforcing bar 7a extending in the horizontal direction is provided. Further, a vertical reinforcing bar 7b is provided along the axis of the H-shaped steel 6 and extending in the vertical direction.

[0028] And, at the upper end (wall head 4a) and the lower end (wall foot 4b), the H-shaped steel 6, the channel steel 3, the horizontal reinforcing bar 7a, and the vertical reinforcing bar 7b are embedded inside by concrete. Further, the wall main body 4c is integrally formed as the wall member with the wall head 4a and the wall foot 4b. In the wall main body 4c, between the upper end and the lower end of the portion corresponding to the wall member 4 of the H-shaped steel 6, the channel steel 3, the horizontal reinforcing bar 7a, and the vertical reinforcing bar 7b are embedded inside by concrete.

[0029] Thus, the wall main body 4c of this wall member 4 is a so-called reinforced concrete (RC structure) in which the channel steel 3, the horizontal reinforcing bar 7a, and the vertical reinforcing bar 7b are embedded inside by concrete. On the other hand, the wall head 4a and the wall foot 4b of the wall member 4 are of an SRC structure in which the H-shaped steel 6, the channel steel 3, and the reinforcing bars 7a and 7b are embedded in concrete. Thus, the wall head and the wall foot are of an SRC structure in which the H-shaped steel, the channel steel, and the reinforcing bars are embedded in concrete, and function as a strong beam structure. Therefore, the strength of the wall member is significantly improved, and the occurrence of distortion, destruction, overturning, and settlement due to earth pressure can be suppressed in the wall member.

[0030] In particular, as shown in FIGS. 3 and 4, in the wall head portion 4a and the wall foot portion 4b, the channel steel 3 is fixed to the outer surface side and the inner surface side of the H-shaped steel 6, and in the wall main body portion 4c, the channel steel 3 is fixed to the outer surface side 6 of the H-shaped steel. Therefore, the wall head portion 4a and the wall foot portion 4b have a thickness Wa in the width direction (front-rear direction of the wall) that is larger than the thickness W of the wall main body portion 4c of the wall member 4. That is, the wall head portion 4a and the wall foot portion 4b have a shape that protrudes inward from the wall main body portion 4c of the wall member 4. As a result, the lower surface of the wall foot portion 4b of the wall member 4 has a surface shape (bottom surface shape) with a thickness Wa in the width direction (front-rear direction of the wall) that is larger than the thickness of the wall main body portion 4c of the wall member 4, and the occurrence of settlement, heaping, and consolidation slip can be further prevented.

[0031] The retaining wall 1 configured in this way has a composite structure in which the support pile 2 and the wall member 4 are integrated, and the horizontal component force of the earth pressure received by the wall member 4 is transmitted to the H-shaped steel 6 at the upper part of the support pile 2 and the lower part of the support pile 2 via the channel steel 3. At this time, the wall head portion 4a and the wall foot portion 4b have the SRC structure as described above and function as a strong beam structure. Therefore, compared with the wall member of the RC structure in which the wall head portion 4a and the wall foot portion 4b are not formed, the strength of the wall member is significantly improved, and the occurrence of distortion, destruction, overturning, and settlement of the wall member due to earth pressure can be prevented.

[0032] Furthermore, based on FIGS. 1 to 4, each configuration of the retaining wall 1 according to the embodiment of the present invention will be described in detail. (Support pile 2) As shown in FIG. 1, the support pile 2 has, for example, a columnar portion 5 formed by cement milk in the ground and an H-shaped steel 6 fixed to the columnar portion 5. The support pile 2 is fixed in the ground by the cement milk method and firmly rooted, and is installed so that the axis of the support pile 2 is in the vertical direction. The lower part of the H-shaped steel 6 is arranged inside the columnar portion 5, and the upper part of the H-shaped steel 6 is exposed from the columnar portion 5. The cement milk is generated, for example, by mixing soil, water, cement, and bentonite mixture at a mixing plant at the construction site.

[0033] The support pile 2 has its lower end buried in the ground, and its lowermost end is fixed to the support layer of the ground. As shown in FIG. 1, a plurality of the support piles 2 are installed in parallel at predetermined intervals along the wall surface of the wall member 4 to be formed. The interval L1 between the support piles 2 is, for example, 2000 mm. The portion of the H-shaped steel 6 where the wall member 4 is provided is exposed without being covered by the columnar portion 5 formed by cement milk. As shown in FIGS. 3 and 4, the wall member 4 is provided on the exposed portion of this H-shaped steel 6 via the channel steel 3.

[0034] The H-shaped steel 6 is a rolled steel section manufactured by hot rolling, and has a web 6a and two flanges 6b and 6c parallel to each other as shown in FIG. 2. As shown in FIGS. 3 and 4, the plate surfaces of the flanges 6b and 6c of the H-shaped steel 6 are installed parallel to the wall surface of the wall member 4. The H-shaped steel 6 uses a standard product based on JIS (Japanese Industrial Standards), etc. Incidentally, in one support pile 2, a plurality of H-shaped steels 6 may be connected in the axial direction. The H-shaped steels 6 can be joined, for example, by high-strength bolts.

[0035] (Channel steel 3) As shown in FIGS. 3 and 4, the channel steel 3 is, for example, an L-shaped equal-angled steel (not limited to equilateral, but may be an angle steel), and has a web 3a and one flange 3b formed at one end side of the web 3a. The channel steel 3 is a rolled steel section manufactured by hot rolling, and is, for example, a standard product based on JIS. In the case of a hot-rolled steel section, unlike a cast product, the channel steel 3 has no variation in strength and is stable regardless of the product.

[0036] As shown in FIGS. 3 and 4, the flange 3b of this channel steel 3 is joined and fixed to the H-shaped steel 6, and the web 3a is arranged substantially horizontally in a cantilever state. That is, one surface of the channel steel 3 is joined and fixed to the H-shaped steel, and in a side view, the channel steel 3 is attached to the H-shaped steel in an L shape. The fixing of this channel steel 3 is performed by welding or high-strength bolts. As a result, the H-shaped steel 6 and the channel steel 3 are in surface contact and joined and fixed, so the force transmission between the H-shaped steel 6 and the channel steel 3 is carried out by the surface. In the following description, in the H-shaped steel 6, the side where the wall main body 4c of the wall member 4 is arranged (the flange 6b side) is referred to as the outer surface side, and the opposite side (the flange 6c side) is referred to as the inner surface side.

[0037] Regarding the fixing of the support pile 2 and the channel steel 3, the flange 3b of the channel steel 3 is fixed to the flanges 6b and 6c of the H-shaped steel 6 of the support pile 2 so as to be in surface contact with each other. For example, the support pile 2 and the channel steel 3 are fixed to each other by joining by arc welding. The joining of members can be carried out by welding work using a generator-cum-welding machine (welder) commonly used at the construction site, and the joining work of the channel steel 3 to the support pile 2 can be carried out quickly and simply at the site. Also, according to the welding work at the site, it is easy to adjust the height position of the channel steel 3.

[0038] Whether the channel steel 3 is properly fixed to the support pile 2 is inspected by impact inspection. At this time, in a side view, the channel steel 3 is attached to the H-shaped steel in an L shape, and since the second flange (protrusion) of the channel steel as shown in Patent Document 1 is not formed, the danger that the hammer hits the tip of the second flange and flows laterally and hits the operator can be avoided.

[0039] Also, the support pile 2 and the channel steel 3 may be fixed to each other by joining with high-strength bolts (not shown). The high-strength bolts are, for example, torx-shaped high-strength bolts (S10T M22), and the tightening torque can be confirmed by breaking the pin tail formed in advance at the tip, and uniform mounting strength can be ensured for a plurality of high-strength bolts. The tightening of the high-strength bolts is carried out using a socket wrench (for example, an ultra-short type). In the case of joining with high-strength bolts, the work can be carried out only with a generator.

[0040] Further, on the outer surface side (flange 6b side) of the surface between the upper end 6d and the lower end 6e of the portion corresponding to the wall member 4 in the H-shaped steel 6 (the portion corresponding to the wall main body 4c of the wall member 4), a plurality of channel steels 3 are provided at equal intervals along the axial direction of the H-shaped steel 6. And in each channel steel 3, the force is transmitted between the support pile 2 and the wall member 4. The interval L2 between the channel steels 3 is, for example, about 200 mm to 300 mm.

[0041] As shown in FIG. 3, on the outer surface side (flange 6b side) and the inner surface side (flange 6c side) of the upper end 6d of the portion corresponding to the wall member 4 in the H-shaped steel 6, channel steels 3 are provided respectively. Similarly, as shown in FIG. 4, on the outer surface side (flange 6b side) and the inner surface side (flange 6c side) of the lower end 6e of the portion corresponding to the wall member 4 in the H-shaped steel 6, channel steels 3 are provided respectively. In addition, FIGS. 3 and 4 show the case where two channel steels 3 are provided along the axial direction of the H-shaped steel 6 on the outer surface side (flange 6b side) and the inner surface side of the upper end 6d and the lower end 6e of the portion corresponding to the wall member 4 in the H-shaped steel 6 respectively.

[0042] The channel steel 3 is joined and fixed to the H-shaped steel 6 of each support pile 2, and is further embedded in the wall member 4 with concrete, so that the support pile 2 and the wall member 4 are integrated. Also, at the upper end 6d and the lower end 6e of the portion corresponding to the wall member 4 in the H-shaped steel 6, the channel steels 3 are provided on the outer surface side (flange 6b side) and the inner surface side (flange 6c side) of the H-shaped steel 6 respectively, and the wall head 4a and the wall foot 4b of the wall member 4 are formed. As shown in FIGS. 3 and 4 when looking at the vertical section, the wall member 4 is formed in a so-called U shape by the wall head 4a and the wall foot 4b protruding from the wall main body 4c.

[0043] When the height H of the wall member 4 (see FIG. 1) is, for example, 6000 mm, about 20 to 30 channel steels 3 are installed on the outer surface (flange 6b side) of one H-shaped steel 6. In addition, it is desirable to vary the spacing between the channel steels 3 according to the earth pressure received by the wall member 4. For example, the spacing L2 between the channel steels 3 at the lower part of the wall member 4 may be made narrower than that at the upper part.

[0044] Further, the channel steels 3 are joined and fixed to the respective support piles 2 (H-shaped steels 6) so that the horizontal heights are the same in all the support piles 2 (H-shaped steels 6) provided in parallel.

[0045] (Reinforcing bars 7) As shown in FIGS. 2 to 4, the reinforcing bars 7 include, for example, a plurality of laterally extending horizontal reinforcing bars 7a which are main reinforcing bars, and a plurality of vertically extending vertical reinforcing bars 7b which are, for example, distribution reinforcing bars. The horizontal reinforcing bars 7a have, for example, a diameter of D16 and are arranged horizontally on the channel steels 3. The horizontal reinforcing bars 7a are bundled with the channel steels 3 and fixed to the channel steels 3. On the other hand, the vertical reinforcing bars 7b have, for example, a diameter of D13. The vertical reinforcing bars 7b are bundled with the horizontal reinforcing bars 7a and fixed to the horizontal reinforcing bars 7a.

[0046] Since each of the horizontal reinforcing bars 7a is placed on the channel steel 3, the spacing between the horizontal reinforcing bars 7a in the vertical direction in the wall member 4 is equal to the spacing L2 between the channel steels 3 and is, for example, about 200 mm to 300 mm. The spacing L3 between the vertical reinforcing bars 7b in the horizontal direction in the wall member 4 is, for example, about 200 mm to 300 mm. The reinforcing bars 7 are arranged in a lattice pattern inside the wall member 4 by the horizontal reinforcing bars 7a and the vertical reinforcing bars 7b.

[0047] As shown in FIGS. 2 to 4, the horizontal reinforcing bars 7a (7) of the wall member 4 are placed horizontally on the horizontal webs 3a of the channel steels 3 having the same height, and the horizontal reinforcing bars 7a (7) are bundled with the channel steels 3. Thereby, force transmission becomes possible between the channel steel 3 and the horizontal reinforcing bars 7a (7) of the wall member 4, and the stress applied to the wall member 4 is reliably transmitted to the support pile 2 via the channel steel 3.

[0048] On the horizontal web 3a of the channel steel 3, for example, two lateral reinforcing bars 7a (7) of the wall member 4 are placed. Therefore, in a state where the channel steel 3 is fixed to the flanges 6b and 6c of the H-shaped steel 6 of the support pile 2, the reinforcing bar 7 placed on the web 3a of the channel steel 3 can be installed at a fixed position with respect to the flange surface of the H-shaped steel 6.

[0049] Also, when arranging the lateral reinforcing bars 7a of the wall member 4, since the reinforcing bar 7 can be arranged in the horizontal direction simply by placing the reinforcing bar 7a on a plurality of channel steels 3, the arranging work is easy. And on the horizontal web 3a of the channel steel 3, since it is easy to arrange while keeping the interval between the lateral reinforcing bars 7a at a predetermined distance, the interval of the reinforcing bars 7 can be accurately maintained.

[0050] (First, second, and third stirrups 10, 11, 12) As shown in FIGS. 3 and 4, the wall head 4a and the wall foot 4b of the wall member 4 have a first stirrup 10 arranged so as to surround the lateral reinforcing bar 7a provided on the channel steel 3. As shown in FIG. 2, a plurality of the first stirrups 10 are provided in the extending direction of the wall member 4 at the wall head 4a and the wall foot 4b of the wall member 4.

[0051] Specifically, as shown in FIG. 3, the first stirrup 10 is provided so as to surround the entire lateral reinforcing bar 7a across the inner surface and the outer surface side of the upper end portion of the portion of the H-shaped steel 6 corresponding to the wall member 4. Therefore, as shown in FIG. 6, the first stirrup 10 has a rectangular shape that is long in the width direction of the wall member. Furthermore, as shown in FIG. 2, a plurality of the first stirrups 10 are provided between a plurality of H-shaped steels 6 provided in parallel. When the interval between the first stirrups 10 between the plurality of H-shaped steels 6 is 100 mm or less, for example, D10 is used, and when the interval of the first stirrup 10 exceeds 100 mm, for example, D13 is used.

[0052] Similarly, as shown in FIG. 4, this first stirrup 10 is provided so as to surround the entire transverse reinforcement 7a across the inner and outer surfaces of the lower end portion of the portion corresponding to the wall member 4 in the H-shaped steel 6. Further, as shown in FIG. 2, a plurality of first stirrups 10 are provided between a plurality of H-shaped steels 6 provided in parallel.

[0053] When the interval between the first stirrups 10 between the plurality of H-shaped steels 6 is 100 mm or less, for example, D10 is used. When the interval between the first stirrups 10 exceeds 100 mm, for example, D13 is used.

[0054] And the contact portions of the first stirrup 10 with the transverse reinforcement 7a and the longitudinal reinforcement 7b are joined by tying. In this way, since the first stirrup 10 is provided so as to surround the entire transverse reinforcement 7a disposed in the channel-shaped steels 3 on the outer and inner surface sides at the upper end portion 4a and the lower end portion 4b respectively, the strength of the upper end portion 4a and the lower end portion 4b of the wall member 6 can be improved.

[0055] Furthermore, as shown in FIGS. 2 to 4, in addition to the first stirrup 10, a second stirrup 11 is disposed so as to surround the entire transverse reinforcement 7a disposed in the channel-shaped steel 3 fixed to the outer surface side of the exposed H-shaped steel 6. A plurality of second stirrups 11 are disposed at the upper end portion 6a and the lower end portion 6b respectively at a predetermined interval facing the H-shaped steel. Also, a third stirrup 12 is disposed so as to surround the entire transverse reinforcement 7a disposed in the channel-shaped steel 3 fixed to the inner surface side of the exposed H-shaped steel 6. A plurality of third stirrups 12 are disposed at the upper end portion 6a and the lower end portion 6b respectively at a predetermined interval facing the H-shaped steel. As shown in FIGS. 7(a) and 7(b), the second stirrup 11 and the third stirrup 12 are shorter than the first stirrup 10 in the width direction of the wall member 4 and have a rectangular shape. Further, for example, D10 and D13 are used as the second stirrup 11 and the third stirrup 12.

[0056] When the second web bar 11 and the third web bar 12 are provided close to the longitudinal reinforcing bars 7b, the second web bar 11 and the third web bar 12 are bundled with the longitudinal reinforcing bars 7b and the transverse reinforcing bars 7a. When the second web bar 11 and the third web bar 12 are not provided in contact with the longitudinal bars 7b, the second web bar 11 and the third web bar 12 are bundled with the transverse reinforcing bars 7a.

[0057] In this way, at each of the upper end portion 4a and the lower end portion 4b, the second web bar 11 is provided so as to surround the entire transverse reinforcing bar 7a disposed on the outer surface side, and the third web bar 12 is provided so as to surround the entire transverse reinforcing bar 7a disposed on the inner surface side in the channel steel 3. Therefore, the strength of the upper end portion 4a and the lower end portion 4b of the wall member 4 can be further improved.

[0058] (First width restraining bar 15, second width restraining bar 16) As shown in FIG. 2, a plurality of first width restraining bars 15 and second width restraining bars 16 are provided between a plurality of H-shaped steels 6 provided in parallel. The first width restraining bar 15 and the second width restraining bar 16 are arranged between the longitudinal reinforcing bars 7b and are provided on the side of the transverse reinforcing bars close to the H-shaped steel 6.

[0059] As shown in FIG. 8, the first width restraining bar 15 and the second width restraining bar 16 are reinforcing bars having ends formed in a U shape. Further, the first width restraining bar 15 and the second width restraining bar 16 are the upper and lower transverse reinforcing bars 7a disposed in the channel steels 3 provided in the vertical direction on the outer surface side and the inner surface side, and are bundled with the first web bar 10 and the transverse reinforcing bars 7a disposed on the H-shaped steel 6 side.

[0060] Here, the width restraining bar refers to a reinforcing bar disposed in the main reinforcement direction in the middle part of the beam in order to ensure the shape of the web bar. Not only at the upper end portion 6d of the H-shaped steel 6 shown in FIG. 5, but also at the lower end portion 6e (not shown), the first width restraining rib 15 and the second width restraining rib 16 are provided. The width restraining ribs 15 and 16 at the lower end portion 6e are arranged in the same manner as the upper end portion 6d of the H-shaped steel 6.

[0061] In this way, by using the first width restraining rib 15 and the second width restraining rib 16, the strength of the wall member can be increased more, and it can reliably support against the horizontal component of the earth pressure over a long period.

[0062] (Wall member 4) As described above, the wall member 4 is in contact with the soil and receives the horizontal component of the earth pressure. As described above, the wall member 4 is composed of a wall head portion 4a, a wall foot portion 4b, and a main body portion 4c between the wall head portion 4a and the wall foot portion 4. And the wall member 4 is installed along a plurality of support piles 2 provided in parallel as shown in FIG. 1. The wall surface of the wall member 4 is formed perpendicular to the horizontal plane as shown in FIGS. 3 and 4. The thickness of the wall member 4 is determined according to the earth pressure received by the wall member 4.

[0063] The thickness W of the wall member 4 is, for example, about 200 mm to 250 mm. This thickness W of the wall member 4 depends on the height of the surface of the wall member 4. For example, when the height of the surface of the wall member 4 is 3 m, the thickness W of the wall member 4 is made 250 mm. Also, the thickness Wa of the wall head portion 4a and the thickness Wb of the wall foot portion 4b are, for example, about 600 mm to 650 mm when the thickness of the H-shaped steel 6 is 400 mm.

[0064] As described above, the wall member 4 has the grooved steel 3 embedded therein and is integrated with the support pile 2, receives the force of the horizontal component of the earth pressure, and transmits the force to the support pile 2 through the grooved steel 3, which is a shaped steel arranged inside.

[0065] Also, as described above, this wall main body portion 4c (the portion between the wall head portion 4a and the wall foot portion 4b) is a reinforced concrete (RC structure) in which the reinforcing bars 7 are arranged inside the concrete. In addition, the wall head 4a and the wall foot 4b form a so-called SRC (Steel Reinforced Concrete) structure for embedding the H-shaped steel 6, the channel steel 3, the reinforcing bars 7, and the stirrups 10 in the concrete. Since the wall head 4a and the wall foot 4b of the wall member 4 can be made into a high-strength beam structure, the strength of the wall member is significantly improved, and it is possible to prevent deformation of the wall member due to earth pressure, destruction such as shear failure, and occurrence of overturning.

[0066] In addition, the wall foot 4b of the wall member 4 is installed and anchored to a position below the ground surface (underground) on the lower side of the step portion. The wall foot 4b of the wall member 4 has a high-strength beam structure as described above, and the lower surface of the wall foot 4b of the wall member 4 is formed into a surface shape with a length in the width direction (front-rear direction of the wall) larger than the thickness W of the wall main body portion 4c of the wall member 4 (width Wb).

[0067] Therefore, by installing the wall foot 4b with a large surface shape in the width direction (front-rear direction of the wall) underground, it is possible to prevent settlement and heaving that may occur according to the properties of the ground. In addition, by adjusting the anchoring depth, it is possible to prevent the soil (backfill soil) on the upper side of the step portion of the land from passing under the retaining wall 1 due to consolidation settlement and pushing up the excavated bottom ground on the lower side of the step portion (arc slip). Note that, as shown in FIG. 4, the wall foot 4b of the wall member 4 installed underground can be installed more stably by installing it on the disposable concrete 14 formed on the ground solidified with crushed stones 13.

[0068] (Method for constructing the retaining wall 1) Next, a method for constructing the retaining wall according to the present embodiment will be described. The method for constructing the retaining wall is basically performed by the same method as the construction method described in Patent Document 1, except for the portions forming the wall head 4a and the wall foot 4b. First, at the construction site, the support piles 2 are driven. The support piles 2 are driven by the pre-boring and cement milk injection and consolidation method.

[0069] Marking is performed on a steel material called a gauge that serves as a mark for the installation position of the H-beam 6, and the pile core is determined. Based on the marking, an auger (drill) for excavation of a construction machine for building is set. Then, a hole is drilled to a specified depth by the auger, the auger is pulled out at the same rotation as during drilling, and cement milk is injected while the soil is carried out. This prevents the collapse of the drilled hole wall due to the pressure of the cement milk.

[0070] Next, the H-beam 6 is lifted by a construction machine, moved to the upper part of the drilled hole, and built into the drilled hole. After driving the support piles 2, when it is necessary to excavate in front of the support piles 2 on a sloping ground or the like, if necessary, while burying horizontal sheeting in the ground between the support piles 2 in the height direction and stacking them, the front side of the support piles 2 may be excavated in the same manner as the construction method of temporary earth retaining.

[0071] After completion of driving a plurality of support piles 2, the channel steel 3 is fixed to the support piles 2. First, the fixing position of the channel steel 3 is determined on the flange of the support pile 2 by layout. The fixing of the channel steel 3 is by welding or high-strength bolt connection. At the construction site, after the fixing position of the channel steel 3 is determined, the channel steel 3 is fixed by welding or high-strength bolt connection. Whether the channel steel 3 is properly fixed to the support pile 2 is inspected by impact inspection.

[0072] After all the channel steels 3 are fixed to the support piles 2, reinforcement work is performed to form the wall member 4. The horizontal reinforcing bars 7a can be placed on the channel steel 3 which is a shaped steel, so the work is easy. Also, between the channel steels 3, vertical reinforcing bars 7b are arranged parallel to the axis of the H-beam 6. Then, the reinforcing bars 7 of the wall member 4 are arranged by binding the horizontal reinforcing bars 7a to the channel steel 3 or binding the vertical reinforcing bars 7b to the horizontal reinforcing bars 7a.

[0073] Furthermore, the first stirrup 10 is arranged so as to surround the horizontal reinforcing bar 7a across the inner surface and the outer surface side at the upper end portion 6d of the portion corresponding to the wall member 4 in the H-shaped steel 6. As shown in FIG. 2, a plurality of the first stirrups 10 at the upper end portion 6d are arranged between a plurality of H-shaped steels 6 provided in parallel. Also, the first stirrup 10 is arranged so as to surround the horizontal reinforcing bar 7a across the inner surface and the outer surface side at the lower end portion 6e of the portion corresponding to the wall member 4 in the H-shaped steel 6. A plurality of the first stirrups 10 at the lower end portion 6e are arranged between a plurality of H-shaped steels 6 provided in parallel. Furthermore, the first width retaining bars 15 and the second width retaining bars 16 are arranged between the longitudinal reinforcing bars 7b and disposed on the side of the horizontal reinforcing bar closer to the H-shaped steel 6.

[0074] And where the longitudinal reinforcing bar 7b exists, the first stirrup 10, the horizontal reinforcing bar 7a, and the longitudinal reinforcing bar 7b are bundled. Also, where the longitudinal reinforcing bar 7b does not exist (the first width retaining bars 15 and the second width retaining bars 16 exist), the first width retaining bars 15 and the second width retaining bars 16 are the upper and lower horizontal reinforcing bars 7a disposed in the channel-shaped steels 3 provided in the vertical direction on the outer surface side and the inner surface side, and are bundled with the reinforcing bars 7a disposed on the H-shaped steel 6 side.

[0075] Furthermore, as shown in FIG. 2, a plurality of second stirrups 11 and third stirrups 12 are provided opposite to the H-shaped steel 6. The second stirrups 11 and the third stirrups 12 are bundled with the longitudinal reinforcing bars 7b and the horizontal reinforcing bars 7a, and are bundled with the horizontal reinforcing bars 7a when the longitudinal reinforcing bars 7b do not exist. In this way, by providing the second stirrups 11 and the third stirrups 12, the strength of the upper end portion 4a and the lower end portion 4b of the wall member 4 can be further improved.

[0076] Next, the concrete portion of the wall member 4 is formed. The wall member 4 is formed by cast-in-place concrete. That is, formwork erection, concrete placement, and formwork removal after ensuring a predetermined concrete strength are performed. Thereby, a structure of the retaining wall 1 in which the wall member 4 is integrated with the support pile 2 is completed.

[0077] As described above, according to the present embodiment, the reinforced concrete wall member 4 receives the horizontal component of the earth pressure and transmits the force to the support pile 2 through the channel steel 3 which is a shaped steel disposed inside. The retaining wall 1 has a composite structure in which the support pile 2 which is an H-shaped steel and the wall member 4 (wall main body 4c) which is reinforced concrete (RC structure) are integrated.

[0078] In particular, the wall head 4a and the wall foot 4b of the wall member 4 have an SRC structure in which the H-shaped steel 6, the channel steel 3, and the reinforcing bar 7 are embedded in the concrete, and function as a strong beam structure. Therefore, the strength of the wall member 4 can be improved, the deformation and breakage of the wall member 4 can be prevented, and the wall member 4 can reliably support the horizontal component of the earth pressure over a long period. Further, since the lower surface of the wall foot 4b of the wall member 4 has a surface shape in which the length (width Wb) in the width direction (front-rear direction of the wall) is larger than the thickness W of the wall main body 4c of the wall member 4, it is possible to prevent the occurrence of settlement, heaving, and consolidation slip that may occur according to the properties of the ground.

[0079] Furthermore, when performing the impact inspection, since the second flange of the channel steel does not protrude as shown in Patent Document 1, the impact inspection can be properly performed, and the risk that the hammer hits the tip of the second flange and flows laterally and hits the operator can be avoided.

[0080] In the above embodiment, the channel steel 3 has an L-shape (angle steel) having a web 3a and one flange 3b formed on one end side of the web 3a. However, in the present invention, the shape of the channel steel 3 is not limited to this form. For example, the web portion of the channel steel having a U-shaped cross section having flanges on both the left and right sides of the web may be joined in a state of surface contact with the flange of the H-shaped steel 6, and reinforcing bars may be arranged on the flange portion.

[0081] (Second Embodiment) Next, a second embodiment of the present invention will be described. FIG. 9 is a plan view showing a part of the retaining wall 1 in the second embodiment. In the above-described first embodiment, the wall main body portion 4c of the wall member 4 has been described as a configuration example of a single flat plate shape. In the second embodiment, however, the configuration is such that two vertically arranged wall members 4A and 4B are connected at a predetermined crossing angle. In this embodiment, two wall members are described as an example, but the present invention is not limited to two wall members, and a plurality of wall members can also be connected.

[0082] Also, in the example shown in FIG. 9, the wall member 4A and the wall member 4B are connected at an angle of 90°. Since the configurations of the wall member 4A and the wall member 4B are the same as those of the wall member 4 described in the first embodiment, the same reference numerals are used and the detailed description thereof is omitted. In this embodiment, the case where the wall member 4A and the wall member 4B are connected at an angle of 90° is described as an example, but the present invention is not limited to 90°, and an angle less than 90° or greater than 90° may be used.

[0083] As shown in FIG. 9, the connecting portion R between the wall member 4A and the wall member 4B is composed of a horizontal reinforcing bar 7a, a vertical reinforcing bar 7b, a first web bar 10, and concrete, so that the wall member 4A and the wall member 4B can be connected at a desired crossing angle. Also, as shown in FIG. 9, the second web bar 11 and the third web bar 12 can be appropriately arranged. Moreover, the upper end portions of the wall member 4A and the wall member 4B are part of a beam structure (SRC structure), and the lower end portions of the wall member 4A and the wall member 4B are also part of a beam structure (SRC structure). These are formed as an integrated wall member by connecting the beams. Therefore, a greater strength can be obtained compared to the case where the wall members are formed as separate wall members.

[0084] (Third Embodiment) Furthermore, a third embodiment according to the present invention will be described. FIG. 10 is a front view of a retaining wall according to the third embodiment of the present invention, FIGS. 11 and 12 are cross-sectional views of the retaining wall in FIG. 10, FIG. 11 is a cross-sectional view of the wall head 4a, and FIG. 12 is a cross-sectional view of the wall foot 4b. In FIGS. 10 to 13, the same components as those described in the first embodiment are denoted by the same reference numerals, and detailed descriptions thereof are omitted.

[0085] As shown in FIGS. 10, 12, and 13, the retaining wall 1 is provided with a wall head 4a and a wall foot 4b in the same manner as in the first embodiment. This third embodiment is characterized in that a connecting member 17 for connecting H-shaped steels 6 constituting support piles is provided at the upper end of the wall head 4a. The connecting member 17 may also be provided on the wall foot 4b as shown in FIGS. 10 and 12.

[0086] This connecting member 17 is provided to prevent the H-shaped steel 6 from tilting. That is, the H-shaped steel 6 is lifted by construction machinery, moved to the upper part of the excavation hole, and built into the excavation hole. Then, the H-shaped steel 6 is fixed in the excavation hole by cement milk. At this time, if even one of the plurality of H-shaped steels 6 tilts, it becomes difficult to form the wall head 4a, the wall foot 4b, and the wall main body 4c. In order to prevent such a state from occurring, the connecting member 17 is provided.

[0087] As described above, this connecting member 17 is arranged at the wall head, extends in the lateral direction of the wall main body 4c, and is fixed to the upper ends of the plurality of H-shaped steels 6. This connecting member 17 only needs to be able to prevent the H-shaped steel 6 from tilting and is not particularly limited. For example, isosceles angle steel (or angle steel), channel steel, or steel materials conforming to JIS standards can be used. The fixing is performed by welding or bolting the connecting member 17 to the H-shaped steel 6. In this way, by connecting the H-shaped steels 6 to each other by the connecting member 17, the tilting of the H-shaped steel 6 is suppressed, and the wall head 4a, the wall foot 4b, and the wall main body 4c can be accurately formed.

Description of Reference Numerals

[0088] 1 Retaining wall 2 Support pile 3 Channel steel 3a Web 3b Flange 4 Wall member 4a Wall head 4b Wall foot 4c Wall main body 5 Columnar part 6 H-shaped steel 7 Reinforcing bar 7a Horizontal reinforcing bar 7b Vertical reinforcing bar 10 First collar bar 11 Second collar bar 12 Third collar bar 15 First width retaining bar 16 Second width retaining bar

Claims

1. A retaining wall that receives a horizontal component of earth pressure by a wall member, A plurality of support piles each having a columnar portion formed of cement milk in the ground and an H-shaped steel having a lower portion disposed inside the columnar portion and an upper portion exposed from the columnar portion; A plurality of channel steels fixed to the outer and inner sides of upper and lower ends of the H-shaped steel portions corresponding to the wall members, and fixed to the outer side between the upper and lower ends of the H-shaped steel portions corresponding to the wall members; A horizontal reinforcing bar disposed on the upper surface of the channel steel and extending laterally; A vertical reinforcing bar arranged along the axis of the H-shaped steel and extending vertically; a wall head and a wall foot formed at the upper and lower ends of the portion of the H-shaped steel corresponding to the wall member, in which the H-shaped steel, the channel steel, the horizontal reinforcing bars, and the vertical reinforcing bars are embedded inside with concrete; a wall body portion formed integrally with the wall head portion and the wall foot portion as the wall member, the channel steel, the horizontal reinforcing bars, and the vertical reinforcing bars being embedded in concrete between the upper end portion and the lower end portion of the portion corresponding to the wall member of the H-shaped steel; A retaining wall comprising:

2. The wall head and wall foot are shaped to protrude inward from the wall body, 2. The retaining wall according to claim 1, wherein the wall head portion is formed to be wider than the wall body portion, and the wall foot portion is formed to be wider than the wall body portion.

3. At the wall head and wall foot, Further, the wall member of the H-shaped steel is provided with first stirrups arranged at the upper end and the lower end so as to surround the horizontal reinforcing bars arranged in a channel steel fixed to the outer surface side and the inner surface side of the upper end and the lower end of the part corresponding to the wall member of the H-shaped steel, The retaining wall according to claim 1, characterized in that the H-shaped steel, the channel steel, the horizontal reinforcing bars, the vertical reinforcing bars and the first stirrup formed at the upper and lower ends of the portion of the H-shaped steel corresponding to the wall member are embedded inside with concrete.

4. The channel steel is an angle steel, A retaining wall as described in claim 1, characterized in that one side of the angle iron is joined to an H-shaped steel, and when viewed from the side, the angle iron is attached to the H-shaped steel in an L-shape.

5. At least two of the channel steels are provided in the vertical direction on the outer surface side and the inner surface side of the upper end portion and the lower end portion of the portion of the H-shaped steel corresponding to the wall member, A retaining wall as described in claim 3, characterized in that it is provided with first stirrups arranged at each of the upper and lower ends of the part of the H-shaped steel corresponding to the wall member, so as to surround horizontal reinforcing bars arranged on at least two channel steels fixed to the outer and inner sides of the upper and lower ends of the part.

6. The retaining wall according to claim 3, characterized in that the first stirrups are provided in plurality at predetermined intervals between the H-shaped steel members.

7. If the first stirrup is provided adjacent to a vertical reinforcing bar, the first stirrup is tied to the vertical reinforcing bar and to the horizontal reinforcing bar, 7. A retaining wall according to claim 6, characterized in that, if the first stirrup is not placed close to a vertical reinforcing bar, it is tied to a horizontal reinforcing bar and to a width stop bar which is tied to the horizontal reinforcing bars arranged above and below.

8. A second stirrup is disposed at each of the upper end and the lower end so as to surround the entire horizontal reinforcing bar disposed in the channel steel fixed to the outer surface side of the H-shaped steel, facing the outer surface side of the H-shaped steel; A third stirrup is disposed at each of the upper end and the lower end so as to surround the entire horizontal reinforcing bar disposed in the channel steel fixed to the inner side of the H-shaped steel, facing the inner side of the H-shaped steel; and The retaining wall according to claim 3, further comprising:

9. The second stirrups and the third stirrups are provided in plurality at predetermined intervals facing the H-shaped steel, When the second stirrup and the third stirrup are provided adjacent to the vertical reinforcing bars, the second stirrup and the third stirrup are tied to the vertical reinforcing bars and the horizontal reinforcing bars, 9. A retaining wall according to claim 8, characterized in that, if the second and third stirrups are not provided in contact with the vertical reinforcing bars, the second and third stirrups are tied to the horizontal reinforcing bars.

10. A plurality of the wall members each having a linear shape in a plan view are provided, 2. The retaining wall according to claim 1, wherein the plurality of wall members are connected at a predetermined cross angle to form an integrated wall member.

11. 2. The retaining wall according to claim 1, characterized in that a connecting member is provided at the wall head for connecting the H-shaped steel beams constituting the support piles to each other.

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