Soil retainer panel, soil retainer structure, and construction method

Abstract

To provide a soil retainer panel, a soil retainer structure, and a construction method, which can reduce labor of removing a back-filling material.SOLUTION: A soil retainer panel in this disclosure is a soil retainer panel used for constructing a soil retainer structure arranged along wall surfaces formed by excavating the ground, features a corrugated cross section, and comprises: a corrugated steel plate having crests and troughs alternately formed in a first direction; vertical flanges arranged at first end parts along the first direction of the corrugated steel plate; reinforcement members that are joined to second end parts on the first direction of the corrugated steel plate and also joined to the inner surface of the vertical flanges; and an extension part extending from the reinforcement member toward the wall surface.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to an earth retaining panel arranged along the wall surface of an excavation hole, an earth retaining structure, and a construction method.

Background Art

[0002] Conventionally, as disclosed in, for example, Patent Document 1, there is known an earth retaining structure constructed by assembling an earth retaining panel made of corrugated steel plates in an excavation hole formed by excavating the ground. The earth retaining structure is constructed by stacking, in the hole axis direction, a structure formed by annularly arranging a plurality of corrugated steel plates along the wall surface of the excavation hole.

[0003] In the earth retaining structure, as the depth of the excavation hole increases, the earth pressure from the ground side increases, and the rigidity of only the corrugated steel plates may be insufficient. Further, regardless of the depth, the earth pressure may be large depending on the soil conditions and the like. Furthermore, as the depth in the hole axis direction increases, the self-weight of the structure arranged above acts on the structure arranged below. For this reason, in the earth retaining structure, at locations where the rigidity is insufficient, an H-shaped steel called a reinforcing ring is sandwiched between adjacent corrugated steel plates in the vertical direction to increase the rigidity.

[0004] The reinforcing ring is constructed by arranging a plurality of H-shaped steels along the circumferential direction of the excavation hole such that their flange portions face the ground side and the excavation side, that is, the inside of the excavation hole, and joining the flange portions of adjacent H-shaped steels via joint plates. The joint plates are respectively applied to the flange portions on the ground side and the excavation side of the H-shaped steel, and bolted to the flange portions of adjacent H-shaped steels respectively.

[0005] When H-shaped steel is used as the reinforcing ring, the H-shaped steel is connected to the end portion in the hole axis direction of the earth retaining panel, and the flange portion of the H-shaped steel is arranged so as to cover the ground side of the end portion in the hole axis direction of the earth retaining panel. The structure of the earth retaining structure including the reinforcing ring is arranged at a distance from the ground, and a backfill injection material such as concrete or mortar is filled between the structure and the ground.

Prior Art Documents

Patent Document

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] In the earth retaining structure of Patent Document 1, the filled backfill injection material accumulates from the lower side in the gravitational direction. The accumulated backfill injection material leaks out from between the earth retaining structure and the natural ground, penetrates into the inner space side of the excavation hole from the lower end of the member, wraps around the lower side of the member, and adheres to the outside of the lower flange. Then, when assembling the structure in the lower stage, first, it takes time and effort to remove the backfill injection material adhered to the structure, and the backfill injection material needs to be removed by shaving with a breaker or the like.

[0008] An object of the present disclosure is to provide an earth retaining panel, an earth retaining structure, and a construction method that can suppress and prevent the backfill injection material from penetrating into the inner space side and can reduce the labor required to remove the backfill injection material.

Means for Solving the Problems

[0009] The earth retaining panel according to the present disclosure is an earth retaining panel used for constructing an earth retaining structure installed along a wall surface formed by excavating the natural ground, and has a corrugated cross-sectional shape, a corrugated steel plate in which ridges and valleys are arranged in parallel in a first direction, a vertical flange portion provided at a first end portion of the corrugated steel plate along the first direction, a reinforcing member joined to a second end portion of the corrugated steel plate in the first direction and joined to an inner surface of the vertical flange portion, and an extension portion extending from the reinforcing member in the direction of the wall surface.

[0010] Further, the earth retaining structure according to the present disclosure is an earth retaining structure constructed by connecting a plurality of earth retaining panels in the first direction, and the plurality of earth retaining panels include the above earth retaining panel.

[0011] In addition, the construction method according to the present disclosure is a construction method of a retaining structure installed along a wall surface formed by excavating the natural ground, and includes an arranging step of arranging the above-mentioned retaining panel along the wall surface with the extension portion arranged in the vicinity of the wall surface, a filling step of filling a backfill injection material between the retaining panel and the wall surface, and a removing step of removing the extension portion of the retaining panel.

Effects of the Invention

[0012] In the present disclosure, the corrugated steel sheet has an extension portion extending in a direction opposite to the inner space side, which is the natural ground side, and the extension portion prevents the backfill injection material filled between the wall surface and the corrugated steel sheet from leaking from the lower end of the retaining panel and flowing around to the lower part of the reinforcing member. Therefore, when assembling the lower retaining panel, the labor of removing the backfill injection material fixed to the lower part of the reinforcing member can be reduced.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0014] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In each figure, the same or corresponding parts are denoted by the same reference numerals, and the description thereof will be omitted or simplified as appropriate. In addition, with respect to the configurations shown in each figure, the shape, size, arrangement, etc. can be appropriately changed within the scope of the present invention. In addition, in the present embodiment, terms indicating directions are appropriately used for easy understanding, but these notations are for convenience of explanation and do not limit the arrangement, direction, and orientation of devices, instruments, or parts.

[0015] Embodiment 1. FIG. 1 is a perspective view schematically showing an example of a retaining structure 200 constituted by a retaining panel 101 according to Embodiment 1. The retaining structure 200 is constructed, for example, when constructing a vertical shaft or a civil engineering structure such as a sump well constructed underground for constructing the foundation of a structure or a sewer. The retaining structure 200 is constructed by stacking a plurality of annular structures 201 as shown in FIG. 1 in a plurality of stages along the axial direction of the excavation hole 301 in a vertical excavation hole 301 formed by excavating the ground 300. In Embodiment 1, the retaining structure 200 is formed in a rectangular tubular shape in plan view, but is not limited thereto. The retaining structure 200 can be formed, for example, in a circular, oval, elliptical, rectangular, or horseshoe shape in plan view, and is not limited to a tubular shape.

[0016] <Construction Method of Retaining Structure 200> FIG. 2 is an explanatory diagram schematically showing an example of a construction method of the earth retaining structure 200 according to Embodiment 1. As shown in FIG. 2(A), in the construction method of the earth retaining structure 200, first, an excavation hole 301 for constructing the earth retaining structure 200 is formed in the ground 300. The excavation hole 301 is formed with an outer diameter that is, for example, about 20 cm larger than the outer diameter of the earth retaining structure 200. The depth of the excavation hole 301 is about 0.5 m to 1.5 m as an example. Then, the earth retaining panels 101 are annularly arranged along the wall surface 303 of the excavation hole 301, and the structure 201 is assembled. The earth retaining panels 101 are arranged such that the mountain portion 1a faces the natural ground side and the valley portion 1b faces the excavation side. Note that the natural ground side is the outer surface side of the earth retaining panel 101, and the excavation side is the inner surface side of the earth retaining panel 101.

[0017] The structure 201 is assembled by sequentially arranging the earth retaining panels 101 along the circumferential direction of the wall surface 303 of the excavation hole 301 and connecting the adjacent earth retaining panels 101 on the left and right with bolts and nuts. The earth retaining panel 101 of the upper structure 201 and the earth retaining panel 101 of the lower structure 201 are connected with bolts and nuts. The upper earth retaining panel 101 and the lower earth retaining panel 101 are arranged with their circumferential positions shifted so as to be staggeredly arranged. Thereby, variations in strength and rigidity can be suppressed at each position in the circumferential direction of the earth retaining structure 200. However, if the vertical flange portion 2 of the earth retaining panel 101 has a sufficient thickness, the earth retaining panels 101 may be continuously installed in the hole axis direction without being staggeredly arranged. In this way, the structure 201 is stacked in a plurality of stages, for example, three stages, along the hole axis direction, and a part of the earth retaining structure 200 is constructed.

[0018] Next, as shown in FIG. 2(B), after the structure 201 located at the uppermost stage is fixed by the well girder 400 installed on the ground 300, the excavation hole 301 outside the structure 201 is backfilled with the excavated soil. The means for fixing the structure 201 located at the uppermost stage to the ground 300 is not limited to the well girder 400, and for example, concrete may be used.

[0019] Then, as shown in Fig. 2(C), while excavating the ground, the structure 201 is assembled and dug to a predetermined depth. After the structure 201 located at the uppermost stage is fixed by the well girder 400, the earth retaining panel 101 is arranged along the circumferential direction of the wall surface 303 of the excavation hole 301 at the lower end of the upper structure 201. Then, it is connected to the upper earth retaining panel 101 with bolts and nuts, and the adjacent earth retaining panels 101 on the left and right are connected with bolts and nuts, and the lower structure 201 is constructed. Between the earth retaining panel 101 and the excavation hole 301, concrete or mortar is filled as the backfill injection material.

[0020] In this way, the earth retaining structure 200 is constructed by stacking a plurality of annular structures 201 as shown in Fig. 1 in multiple stages along the hole axis direction of the vertical excavation hole 301 formed by excavating the ground 300. Note that the earth retaining structure 200 is not limited to the rectangular shape shown in Fig. 1. For example, in a plan view, it may be circular, oval-shaped like an oval, or U-shaped like a horseshoe shape. Further, the corrugated steel sheet 1 may be configured in a shape corresponding to the shape of the earth retaining structure 200.

[0021] <Basic shape of the earth retaining panel 101> Fig. 3 is a perspective view showing the earth retaining panel 101 according to Embodiment 1. Fig. 4 is a longitudinal sectional view showing the earth retaining panel 101 according to Embodiment 1.

[0022] As shown in Fig. 3 or Fig. 4, each structure 201 constituting the earth retaining structure 200 is configured by annularly arranging a plurality of earth retaining panels 101 formed using a corrugated steel sheet 1 having the same cross-sectional shape. The earth retaining panel 101 includes a single corrugated steel sheet 1 formed such that the corrugated ridges 1a and valleys 1b extend along the longitudinal direction X, and longitudinal flange portions 2 provided at both ends 11 of the corrugated steel sheet 1 in the longitudinal direction X.

[0023] <Corrugated steel sheet 1> The corrugated steel plate 1 is formed by bending a rolled steel plate into a square wave shape so that the corrugated cross-section becomes a square wave shape. The square wave shape in Embodiment 1 is, for example, a trapezoidal wave shape with rounded corners. The corrugated steel plate 1 is composed of, for example, three peak portions 1a and two valley portions 1b, and the peak portions 1a and the valley portions 1b are arranged in parallel in the Y direction. However, the number of the peak portions 1a and the valley portions 1b is not limited to the illustrated number. In addition, the Y direction in FIG. 3 may be referred to as the width direction Y or the first direction. Further, the longitudinal direction X may be referred to as the second direction.

[0024] When viewed from a perspective along the Z direction, the peak portions 1a and the valley portions 1b are formed to be substantially parallel. The Z direction is a direction intersecting the X direction and the Y direction. The Z direction may be referred to as the third direction. The corrugated steel plate 1 is formed by slightly inclining the web 1c connecting the peak portion 1a and the valley portion 1b with respect to the horizontal direction so that the bottom of the valley portion 1b becomes narrower. By slightly inclining the web 1c, it becomes easier to release the mold when performing plastic processing for corrugation, and the manufacturing becomes easier. Further, the corrugated steel plate 1 reduces the inclination angle of the web 1c connecting the peak portion 1a and the valley portion 1b, so that the width of the peak portion 1a and the valley portion 1b in the Y direction becomes wider, and the rigidity when a bending moment is applied in the plane direction becomes higher. This is because the section modulus when the corrugated steel plate 1 is bent in the Z direction increases as the widths of the peak portion 1a and the valley portion 1b become wider. The inclination angle of the web 1c of the corrugated steel plate 1 with respect to the horizontal direction is set to be 0° or more and 20° or less, and more preferably 0° or more and 3° or less.

[0025] The corrugated steel plate 1 has a thickness of, for example, about 2.7 mm to 7 mm. The plate thicknesses of the peak portion 1a and the valley portion 1b are formed to be the same as the plate thickness of the web 1c, but may be made thicker than the web 1c. By being configured in this way, the cross-sectional areas of the peak portion 1a and the valley portion 1b far from the neutral axis increase, and the section modulus of the corrugated steel plate 1 can be further increased.

[0026] <Horizontal flange portion 10> The corrugated steel plate 1 has horizontal flange portions 10 formed by bending both end edges of the waveform at both end portions 12 in the width direction Y. The horizontal flange portions 10 are formed so as to extend from the peak portion 1a in the Z direction toward the trough portion 1b in the cross-sectional shape, and in the earth retaining structure 200, they face the opposite direction to the wall surface 303 of the excavation hole 301. The horizontal flange portions 10 are flat plate-like portions formed substantially perpendicular to the parallel direction of the peak portions 1a and trough portions 1b of the waveform. A plurality of connecting holes 10a for connecting adjacent corrugated steel plates stacked in the hole axis direction of the excavation hole 301 are formed along the longitudinal direction X in the horizontal flange portions 10. Adjacent corrugated steel plates 1 above and below are connected by butting the horizontal flange portions 10 and fastening the shaft portion of a bolt inserted through the connecting hole 10a with a nut. Note that, as a means for connecting the horizontal flange portions 10 of adjacent corrugated steel plates 1 above and below, a connecting tool such as a clip may be used. Also, the number of the illustrated connecting holes 10a is an example and is not limited thereto.

[0027] <Vertical flange portion 2> The vertical flange portion 2 is configured to be provided by welding plates to both end edges in the longitudinal direction X of the corrugated steel plate 1. The thickness of the vertical flange portion 2 is determined according to the strength and rigidity required for the earth retaining structure 200. A plurality of connecting holes 2a for connecting adjacent earth retaining panels 101 arranged in the circumferential direction of the excavation hole 301 are formed along the vertical direction (Y direction) in the vertical flange portion 2. Adjacent earth retaining panels 101 on the left and right are connected by butting the vertical flange portions 2 and fastening the shaft portion of a bolt inserted through the connecting hole 2a with a nut. As a means for connecting the vertical flange portions 2 of adjacent earth retaining panels 101 on the left and right, a connecting tool such as a clip may be used instead of bolts and nuts. Also, the number of the illustrated connecting holes 2a is an example and is not limited thereto. Note that at the rectangular corners of the structure 201, earth retaining panels 102 for corner portions processed into an L shape are arranged via corner members 41. The corrugated steel plate 1 and the vertical flange portion 2 constituting the earth retaining panel 102 have the same configuration as described above.

[0028] Note that the cross-sectional shape of the earth-retaining panel 101 shown in FIG. 3 is an example, and it may be formed in a sine curve shape, for example, or may have other shapes.

[0029] <Reinforcing member 3> The reinforcing member 3 is disposed sandwiched between a pair of vertical flange portions 2. The reinforcing member 3 extends in a direction intersecting the vertical flange portion 2, and both end faces in the longitudinal direction X are butted against the inner surface 24 of the vertical flange portion 2 and are welded and joined to the vertical flange portion 2. A pair of reinforcing members 3 are provided at both end portions 12 in the width direction Y of the corrugated steel sheet 1. The pair of reinforcing members 3 are joined to the outside of the horizontal flange portions 10 formed at both end portions 12 in the width direction Y of the corrugated steel sheet 1. The reinforcing member 3 is configured to integrate the corrugated steel sheet 1 and the vertical flange portion 2.

[0030] Each of the pair of reinforcing members 3 includes, for example, a first portion 30 whose plate surface is disposed along the Z direction, and a second portion 31 extending from the first portion 30 in the Y direction. The first portion 30 has a plate surface disposed along the Z direction, and is in the same direction as the vertical flange portion 2 with respect to the corrugated steel sheet 1 and extends toward the inner space side of the excavation hole 301. The horizontal flange portion 10 of the corrugated steel sheet 1 abuts against the inner surface 34 of the first portion 30. The width dimension of the first portion 30 of the reinforcing member 3 may be the same as the width dimension of the vertical flange portion 2 and can be appropriately selected. A through hole 3c is formed in the first portion 30. For example, a bolt or the like for connecting to the earth-retaining panel 101 adjacent in the Y direction is inserted through the through hole 3c. The second portion 31 is disposed on the wall surface 303 side of the corrugated steel sheet 1 along the plane at the top of the peak portion 1a of the corrugated steel sheet 1.

[0031] When the pair of reinforcing members 3 are arranged such that the Y direction is parallel to the gravity direction, it includes an upper reinforcing member 37 disposed on the upper side and a lower reinforcing member 38 disposed on the lower side. The reinforcing member 3 does not necessarily need to be joined to the corrugated steel sheet 1, but there is no particular problem even if it is joined to the corrugated steel sheet 1 by welding or the like, for example. For example, when the length of the reinforcing member 3 in the longitudinal direction X is long, the reinforcing member 3 may be intermittently welded to the corrugated steel sheet 1 to maintain the shape.

[0032] <Extension part 32> The extension part 32 is a part that extends in a direction opposite to the inner cavity side, which is the rock side, with respect to the corrugated steel plate 1 and in a direction opposite to the first part 30 of the reinforcing member 3. The extension part 32 is provided at least on the lower reinforcing member 38 among the pair of reinforcing members 3. The extension part 32 extends in the Z direction, which is the direction of the wall surface 303 of the excavation hole 301. The extension part 32 may be integrally formed with the lower reinforcing member 38. The extension part 32 and the lower reinforcing member 38 can be integrally configured by, for example, flat steel or CT-shaped steel. The CT-shaped steel is, for example, a shaped steel obtained by cutting an H-shaped steel in half in the longitudinal direction.

[0033] <Function of the extension part 32> FIG. 5 is a longitudinal sectional view for explaining the function of the extension part 32 of the earth retaining panel 101 according to Embodiment 1. As shown in FIG. 5, the extension part 32 extending from the first part 30 of the lower reinforcing member 38 toward the wall surface 303 side is disposed in the vicinity of the wall surface 303 at the distal end 32a from the first part 30 of the lower reinforcing member 38, that is, at the distal end 32a from the corrugated steel plate 1. The extension part 32 fills the gap between the corrugated steel plate 1 and the rock. When the backfill injection material filled between the earth retaining panel 101 and the wall surface 303 from above the excavation hole 301 flows downward, it is blocked by the extension part 32. For this reason, it is possible to prevent the backfill injection material that has flowed downward from flowing around from below the corrugated steel plate 1 to the lower surface of the lower reinforcing member 38. By preventing the backfill injection material from flowing around to the lower surface of the lower reinforcing member 38 of the earth retaining panel 101 during the assembly of the earth retaining structure 200, the backfill injection material no longer adheres to the lower surface of the lower reinforcing member 38 of the earth retaining panel 101. Therefore, the operation of removing the backfill injection material becomes unnecessary, and the labor for removing the backfill injection material can be reduced. Further, with a configuration using, for example, CT-shaped steel in which the reinforcing member 3 and the extension part 32 are integrated, the backfill injection material can be blocked and the rigidity of the earth retaining panel 101 can be increased.

[0034] The length L of the extension part 32, that is, the length L from the part close to the first part 30 to the distal end 32a from the first part 30, is, for example, 10 cm. The extension part 32 only needs to have a length L such that the distal end 32a reaches the vicinity of the wall surface 303 of the excavation hole 301. Since the accuracy of the excavation work varies, it is sufficient that the extension part 32 approaches so as to contact the wall surface 303.

[0035] <Comparative Example> FIG. 6 is a longitudinal sectional view of the earth retaining panel 101 according to the comparative example. As shown in FIG. 6, the earth retaining panel 101 according to the comparative example includes a lower reinforcing member 38 having a first part 30 and a second part 31, but does not include an extension part 32. When the extension part 32 is not provided, the backfill injection material filled between the earth retaining panel 101 and the excavation hole 301 from above the excavation hole 301 falls downward without being blocked. The fallen backfill injection material gets into the lower surface of the lower reinforcing member 38 from under the corrugated steel sheet 1 and adheres at the lower end of the lower reinforcing member 38. Therefore, when assembling the lower earth retaining panel 101, there is a need to remove the solidified backfill injection material. To remove the adhered backfill injection material, for example, it is necessary to scrape it using a breaker or the like, which takes time and increases the labor of the work.

[0036] By providing the extension part 32 in addition to the reinforcing member 3 having the first part 30 and the second part 31 as in the earth retaining panel 101 of the first embodiment, the backfill injection material can be blocked, so that the time and labor for removing the solidified backfill injection material can be reduced.

[0037] The earth retaining panel 101 according to the first embodiment described above includes an extension part 32 extending from the edge on the wall surface 303 side of the reinforcing member 3 toward the wall surface 303 side. For this reason, it is possible to prevent the backfill injection material filled between the wall surface 303 and the corrugated steel sheet 1 from leaking from the lower end of the earth retaining panel and getting into the lower part. As a result, the labor for removing the solidified backfill injection material during the assembly of the earth retaining structure 200 is reduced, and the earth retaining structure 200 can be assembled smoothly.

[0038] In addition, since the extension part 32 is provided so as to extend from the lower reinforcing member 38, the backfill injection material flowing in the direction of gravity is blocked by the extension part 32, and it is possible to prevent the backfill injection material from leaking from the lower end of the earth retaining panel 101 and flowing around to the lower part of the corrugated steel sheet 1.

[0039] In addition, the extension part 32 is arranged in the vicinity of the wall surface 303 of the excavation hole 301 at the distal end 32a from the corrugated steel sheet 1, and the extension part 32 can prevent the backfill injection material from entering the lower surface of the lower reinforcing member 38.

[0040] In addition, since the extension part 32 is integrally formed with the first part 30 and the second part 31, the manufacture of the earth retaining panel 101 is easy, and since the rigidity of the earth retaining panel 101 is improved, the strength can be maintained.

[0041] In addition, since the extension part 32 is provided on the earth retaining panel 101, the labor for removing the backfill injection material can be reduced, so the period required for the construction of the earth retaining structure 200 can be shortened.

[0042] Embodiment 2. FIG. 7 is a longitudinal sectional view of the earth retaining panel 101 according to Embodiment 2. In Embodiment 2, the configuration of the lower reinforcing member 38 is different from that in Embodiment 1. In Embodiment 2, parts common to Embodiment 1 are denoted by the same reference numerals and the description thereof is omitted, and the description will be centered on the differences from Embodiment 1.

[0043] As shown in FIG. 7, the extension part 32 may be configured separately from the lower reinforcing member 38 in which the first part 30 and the second part 31 are integrated. The first part 30 and the second part 31 are, for example, channel steels, and the extension part 32 is, for example, a plate-shaped flat steel.

[0044] Since the extension part 32 is separate from the lower reinforcing member 38 in which the first part 30 and the second part 31 are integrated, it is possible to prevent the backfill injection material from flowing around and to make the members common with the upper reinforcing member 37.

[0045] According to the earth-retaining panel 101 according to Embodiment 2 described above, since the extension portion 32 is formed separately from the reinforcing member 3, the upper reinforcing member 37 on the upper side and the lower reinforcing member 38 on the lower side of the earth-retaining panel 101 can share members. Therefore, manufacturing becomes easier and the cost of the members can be reduced.

[0046] Embodiment 3. FIG. 8 is a longitudinal sectional view for explaining a construction method of the earth-retaining structure 200 using the earth-retaining panel 101 according to Embodiment 3. FIG. 9 is a longitudinal sectional view showing a state in which the extension portion 32 is removed in the construction method of the earth-retaining structure 200 using the earth-retaining panel 101 according to Embodiment 3. In Embodiment 3, the configuration of the extension portion 32 is different from that of Embodiments 1 and 2. In Embodiment 3, parts common to Embodiments 1 and 2 are denoted by the same reference numerals and the description thereof is omitted, and the description will be centered on the differences from Embodiments 1 and 2.

[0047] As shown in FIGS. 8 and 9, the extension portion 32 can be removed from the lower reinforcing member 38 composed of the first portion 30 and the second portion 31. The lower reinforcing member 38 is, for example, a channel steel constituting the first portion 30 and the second portion 31. The extension portion 32 is, for example, a detachable adapter. The configuration of the upper reinforcing member 37 is not particularly limited, and for example, channel steel may be used.

[0048] In the construction method of the earth-retaining structure 200 using the earth-retaining panel 101, first, in the placement step, the earth-retaining panel 101 having the extension portion 32 is placed on the wall surface 303 of the excavation hole 301 with the extension portion 32 in contact with the natural ground.

[0049] Next, in the filling step, at the uppermost stage of the earth retaining structure 200, from the upper part of the earth retaining structure 200, and from the middle part and later of the earth retaining structure 200, a backfill injection material is filled between the earth retaining panel 101 and the natural ground through a backfill material injection hole (not shown) formed by penetrating the corrugated steel sheet 1. The backfill material injection hole may be formed in advance, or may be formed on-site during construction, for example, at the stage when the earth retaining panel 101 is arranged on the wall surface 303 of the excavation hole 301. The filled backfill injection material fills between the earth retaining panel 101 and the natural ground. A part of the backfill injection material that has flowed downward is blocked by the extension part 32 of the lower reinforcing member 38 and stays on the upper surface of the extension part 32. Therefore, it is possible to prevent the backfill injection material from flowing around to the lower surface of the lower reinforcing member 38.

[0050] Next, in the removal step, the extension part 32 is detached from the first part 30 and the second part 31 and removed. Thereby, the construction of one of the plurality of earth retaining panels 101 constituting the earth retaining structure 200 is completed. Since the extension part 32 is removable, the backfill injection material can easily flow when the lower earth retaining panel 101 is assembled and can be filled up to the corners, so that the fixing property of the earth retaining panel 101 to the natural ground is improved. In addition, since the removable extension part 32 can be replaced each time the earth retaining panel 101 is assembled, the same extension part 32 can be repeatedly used, eliminating wasteful use of resources and reducing the environmental load.

[0051] Note that the extension part 32, the first part 30, and the second part 31 may be fixed, for example, by providing a fixing piece protruding from the extension part 32 in the direction of the first part 30 and inserting a fixing screw that is inserted through the fixing piece and fastened to the first part 30. Further, as long as the extension part 32 can fill the gap between the corrugated steel sheet 1 and the natural ground at the lower end of the corrugated steel sheet 1, the form of the extension part 32 is not particularly limited. For example, it may be fixed to the vertical flange part 2 instead of the first part 30 or the second part 31.

[0052] According to the soil retaining panel 101 and the construction method of the soil retaining panel 101 according to Embodiment 3 described above, since the extension part 32 is detachable, it is possible to repeatedly use the extension part 32 by replacing it when constructing the soil retaining structure 200. Therefore, it is possible to prevent the backfill injection material from flowing around the lower surface of the lower reinforcing member 38 and reduce the load on the environment.

[0053] As described above, the soil retaining panel 101, the soil retaining structure 200, and the construction method have been described based on the embodiments. However, the soil retaining panel 101, the soil retaining structure 200, and the construction method according to the present disclosure are not limited to the configurations of the above-described embodiments. For example, the configuration of the soil retaining panel 101 described above is an example and may include other components. That is, the soil retaining structure 200 can also be used by combining the soil retaining panels 101 according to the required strength. The soil retaining panel 101 may use a corrugated steel plate 1 having a cross-sectional shape of a sine curve shape such as a liner plate, in addition to the corrugated steel plate 1 having a rectangular wave shape. Also, the construction method of the soil retaining structure 200 is also an example and is not limited to the above-described embodiment. In short, the soil retaining panel 101, the soil retaining structure 200, and the construction method include the scope of design changes and application variations that those skilled in the art usually make without departing from the technical idea thereof.

[0054] The soil retaining panel 101, the soil retaining structure 200, and the construction method described above may also include combinations of the respective features shown in the following Supplementary Notes 1 to 8. The combinations are shown below.

[0055] [Supplementary Note 1] A soil retaining panel used for constructing a soil retaining structure installed along a wall surface formed by excavating the natural ground, a corrugated steel plate having a corrugated cross-sectional shape with ridges and valleys arranged in a first direction, and a vertical flange portion provided at a first end portion of the corrugated steel plate along the first direction, and a reinforcing member joined to a second end portion of the corrugated steel plate in the first direction and joined to the inner surface of the vertical flange portion, An extension part extending in the direction of the wall surface from the reinforcing member, A retaining panel provided with . [Appendix 2] When the first direction of the reinforcing member is a direction parallel to the gravity direction, It includes an upper reinforcing member provided on the upper side and a lower reinforcing member provided on the lower side, The extension part is provided on the lower reinforcing member The retaining panel according to Appendix 1. [Appendix 3] The extension part is arranged in the vicinity of the wall surface at the distal end from the corrugated steel plate The retaining panel according to Appendix 1 or 2. [Appendix 4] The extension part is integrally formed with the reinforcing member The retaining panel according to any one of Appendices 1 to 3. [Appendix 5] The extension part is formed separately from the reinforcing member The retaining panel according to any one of Appendices 1 to 3. [Appendix 6] The extension part is detachably attached The retaining panel according to Appendix 5. [Appendix 7] A retaining structure constructed by connecting a plurality of retaining panels in the first direction, The plurality of retaining panels are Including the retaining panel according to any one of Appendices 1 to 6 Retaining structure. [Appendix 8] A construction method of a retaining structure installed along a wall surface formed by excavating natural ground, An arrangement step of arranging the retaining panel according to any one of Appendices 1 to 6 along the wall surface with the extension part arranged in the vicinity of the wall surface; A filling step of filling a backfill injection material between the retaining panel and the wall surface; A removing step of removing the extension part of the retaining panel; A construction method comprising the above steps.

Explanation of symbols

[0056] 1 corrugated steel plate, 1a peak portion, 1b valley portion, 1c web, 2 longitudinal flange portion, 2a connection hole, 3 reinforcing member, 3c through hole, 10 transverse flange portion, 10a connection hole, 11 both ends, 12 both ends, 24 inner surface, 30 first portion, 31 second portion, 32 extension portion, 32a distal end, 34 inner surface, 37 upper reinforcing member, 38 lower reinforcing member, 41 corner member, 101 earth retaining panel, 102 earth retaining panel, 200 earth retaining structure, 201 structure, 300 ground surface, 301 excavation hole, 303 wall surface, 400 well girder.

Claims

1. An earth retaining panel used for constructing an earth retaining structure installed along a wall surface formed by excavating the ground, a corrugated steel sheet having a corrugated cross-sectional shape with ridges and valleys arranged in a first direction, a vertical flange portion provided at a first end of the corrugated steel sheet along the first direction, a reinforcing member joined to a second end of the corrugated steel sheet in the first direction and joined to the inner surface of the vertical flange portion, an extension portion extending from the reinforcing member in the direction of the wall surface, and an earth retaining panel provided with the above.

2. When the first direction of the reinforcing member is a direction parallel to the direction of gravity, it includes an upper reinforcing member provided on the upper side and a lower reinforcing member provided on the lower side, and the extension portion is provided on the lower reinforcing member The earth retaining panel according to claim 1.

3. The extension portion is arranged in the vicinity of the wall surface at the distal end from the corrugated steel sheet The earth retaining panel according to claim 1 or 2.

4. The extension portion is integrally formed with the reinforcing member The earth retaining panel according to claim 1 or 2.

5. The extension portion is formed separately from the reinforcing member The earth retaining panel according to claim 1 or 2.

6. The extension portion is detachably attached The earth retaining panel according to claim 5.

7. An earth retaining structure constructed by connecting a plurality of earth retaining panels in the first direction, wherein the plurality of earth retaining panels include the earth retaining panel according to claim 1 or 2 An earth retaining structure.

8. A method for constructing an earth retaining structure installed along a wall surface formed by excavating the ground, an arranging step of arranging the earth retaining panel according to claim 1 or 2 along the wall surface with the extension portion arranged in the vicinity of the wall surface, a filling step of filling a backfill injection material between the earth retaining panel and the wall surface, a removing step of removing the extension portion of the earth retaining panel, and a construction method provided with the above.

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