Retaining panel and retaining structure using the retaining panel

Abstract

To provide an earth retaining panel and an earth retaining structure using the earth retaining panel, which allow bolt joining work between reinforcement members to be omitted at a construction site.SOLUTION: An earth retaining panel has corrugated steel plates formed so that wave-shaped crest parts and trough parts extend along a longitudinal direction, a pair of vertical flange portions provided at both ends in the longitudinal direction of the corrugated steel plate, and a reinforcement member that extends along the longitudinal direction of the corrugated steel plate and is provided at least one end of both ends in a shorter direction of the corrugated steel plate. The reinforcement member is disposed between the pair of vertical flange portions and connected at both ends in the longitudinal direction to an inner surface of the vertical flange portions.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a soil retaining panel and a soil retaining structure using the soil retaining panel.

Background Art

[0002] Conventionally, as disclosed in, for example, Patent Document 1, there is known a soil retaining structure constructed by assembling soil retaining panels made of corrugated steel plates in an excavation hole formed by excavating the ground. The soil 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] As the depth of the excavation hole increases in the soil retaining structure, the earth pressure from the ground side increases, and the rigidity of only the corrugated steel plate may be insufficient. In addition, regardless of the depth, the earth pressure may be large depending on the soil conditions and the like. Further, 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 soil retaining structure, at a location 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, and joining the flange portions of adjacent H-shaped steels via a joint plate. The joint plate is applied to the flange portion on the ground side and the flange on the excavation side of the H-shaped steel, and bolted to the flange portions of adjacent H-shaped steels, respectively.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, when bolting the joint plate arranged on the ground side when joining the flange portions of adjacent H-shaped steels through the joint plate, in the case of bolting the joint plate arranged on the ground side, the operator has to bend down, get into the ground side from the lower end of the earth retaining structure under construction, and tighten the bolts in a cramped posture. That is, since the workability of bolting on the ground side is poor, complicated, and time-consuming, it was a heavy burden on the operator. As a result, there are problems such as a prolonged construction period and increased construction costs. In addition, when arranging a plurality of H-shaped steels along the circumferential direction of the excavation hole and connecting the left and right adjacent H-shaped steels with flange joints, there are connection portions that are not visible to the operator. Therefore, in this assembly work method, the work is carried out in a state where visual inspection is difficult, making assembly difficult, and there are concerns about safety confirmation.

[0007] The present invention solves the above problems, and an object thereof is to provide an earth retaining panel and an earth retaining structure using the earth retaining panel that can omit the bolt connection work between the reinforcing members at the construction site.

Means for Solving the Problems

[0008] The earth retaining panel according to the present invention is an earth retaining panel used for constructing an earth retaining structure by being installed in an excavation hole formed by excavating the ground, and is formed such that the corrugated peaks and valleys extend along the longitudinal direction. A corrugated steel plate, a pair of vertical flange portions provided at both longitudinal ends of the corrugated steel plate, and a reinforcing member extending along the longitudinal direction of the corrugated steel plate and provided at at least one of both short ends of the corrugated steel plate. The reinforcing member is arranged sandwiched between the pair of vertical flange portions, and both longitudinal ends are joined to the inner surfaces of the vertical flange portions. and the corrugated steel sheet has a horizontal flange portion at at least one of both end portions in the short side direction, and the reinforcing member is provided along the horizontal flange portion is as described above.

[0009] The earth retaining structure according to the present invention includes a structure in which a plurality of the earth retaining panels having the above configuration are arranged along the wall surface of the excavation hole and the earth retaining panels are connected and assembled together.

Effects of the Invention

[0010] In the present invention, since the reinforcing member is disposed sandwiched between a pair of vertical flange portions, and both longitudinal ends of the reinforcing member are joined to the inner surfaces of the vertical flange portions, by joining the vertical flange portions of adjacent earth retaining panels along the circumferential direction of the excavation hole, adjacent reinforcing members can be installed along the circumferential direction without bolt-joining them via a joint plate. Therefore, the bolt-joining work of the reinforcing members at the construction site can be omitted, and the workability of the construction work can be improved.

Brief Description of the Drawings

[0011]

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

Modes for Carrying Out the Invention

[0012] Hereinafter, embodiments of the present invention 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, regarding the configurations shown in each figure, the shape, size, arrangement, etc. can be appropriately changed within the scope of the present invention. Further, in the present embodiment, terms indicating directions (for example, up, down, left, right, vertical, horizontal, etc.) 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.

[0013] Embodiment 1. First, an example of the earth retaining structure 200 will be described with reference to FIGS. 1 to 4. FIG. 1 is a perspective view schematically showing an example of the earth retaining structure 200. FIG. 2 is a perspective view showing an example of the earth retaining panel 101 constituting the earth retaining structure 200. FIG. 3 is a longitudinal sectional view showing an example of the earth retaining panel 101 constituting the earth retaining structure 200. The earth retaining structure 200 is constructed, for example, when constructing a vertical shaft for constructing the foundation of a building structure or a civil engineering structure such as a sump well constructed underground. 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 axial direction of the excavation hole in a vertical excavation hole formed by excavating the ground.

[0014] Each structure 201 that constitutes the earth retaining structure 200 is configured by annularly arranging a plurality of earth retaining panels 101 having the same section modulus. As shown in FIGS. 2 and 3, the earth retaining panel 101 includes a single corrugated steel plate 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 in the longitudinal direction X of the corrugated steel plate 1.

[0015] The corrugated steel plate 1 is configured by bending a rolled steel plate into a square wave shape such that the corrugated cross section becomes a square wave shape. The square wave shape in the present embodiment is, as an example, a trapezoidal wave shape with rounded corners. The corrugated steel plate 1 is composed of, as an example, three ridges 1a and two valleys 1b. However, the number of ridges 1a and valleys 1b is not limited to the illustrated number. The ridges 1a and valleys 1b are formed to be substantially parallel. The corrugated steel plate 1 is formed by slightly inclining the web 1c connecting the ridges 1a and valleys 1b with respect to the horizontal direction so that the bottom of the valley 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 increases the width between the ridges 1a and valleys 1b by reducing the inclination angle of the web 1c connecting the ridges 1a and valleys 1b, and increases the rigidity when a bending moment is applied in the plane direction. This is because the section modulus at the neutral axis of bending of the corrugated steel plate 1 increases as the widths of the ridges 1a and valleys 1b increase. 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.

[0016] The corrugated steel plate 1 has a thickness of, for example, about 2.7 mm to 7 mm. The plate thicknesses of the ridges 1a and valleys 1b are the same as the plate thickness of the web 1c, but may be made thicker than the web 1c. With such a configuration, the cross-sectional areas of the ridges 1a and valleys 1b far from the neutral axis become larger, and the section modulus of the corrugated steel plate 1 can be further increased.

[0017] As shown in FIGS. 2 and 3, the corrugated steel sheet 1 has horizontal flange portions 10 formed by bending both end edges of the waveform at both ends in the short side direction Y. The horizontal flange portion 10 is a flat plate-like portion formed substantially perpendicular to the hole axis direction. A plurality of connecting holes 10a for connecting adjacent corrugated steel sheets stacked vertically in the hole axis direction of the excavation hole are formed along the longitudinal direction X in the horizontal flange portion 10. The adjacent corrugated steel sheets 1 in the vertical direction are connected by butting the horizontal flange portions 10 and fastening the shaft portion of the bolt inserted through the connecting hole 10a with a nut. Note that, as a means for connecting the horizontal flange portions 10 of the adjacent corrugated steel sheets 1 in the vertical direction, 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.

[0018] The vertical flange portion 2 is configured by welding plates to both end edges in the longitudinal direction X of the corrugated steel sheet 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 are formed along the vertical direction (Y direction) in the vertical flange portion 2. The adjacent earth retaining panels 101 in the left-right direction are connected by butting the vertical flange portions 2 and fastening the shaft portion of the bolt inserted through the connecting hole 2a with a nut. Note that, as a means for connecting the vertical flange portions 2 of the adjacent earth retaining panels 101 in the left-right direction, a connecting tool such as a clip may be used. Also, the number of the illustrated connecting holes 2a is an example and is not limited thereto. As shown in FIG. 1, at the rectangular corners of the structure 201, earth retaining panels 102 for corner portions processed into an L shape via corner members 4 are arranged. The corrugated steel sheet 1 and the vertical flange portion 2 constituting the earth retaining panel 102 have the same configuration as described above.

[0019] Note that the cross-sectional shape of the earth retaining panel 101 shown in FIGS. 1 to 3 is an example, and it may be configured to be formed in a sine curve shape, for example, or may have other shapes.

[0020] Next, an example of the construction method of the earth retaining structure 200 will be described with reference to FIG. 4. FIG. 4 is an explanatory diagram schematically showing an example of the construction method of the earth retaining structure 200. First, as shown in FIG. 4(A), an excavation hole 301 for constructing the earth retaining structure 200 is formed on 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 arranged annularly along the wall surface of the excavation hole 301 to assemble the structure 201. The earth retaining panels 101 are arranged such that the mountain part 1a faces the natural ground side and the valley part 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.

[0021] The structure 201 is assembled by sequentially arranging the earth retaining panels 101 along the circumferential direction of the wall surface 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. Note that 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, the earth retaining structure 200 can suppress variations in strength and rigidity at each position in the circumferential direction. However, if the vertical flange portion 2 of the earth retaining panel 101 has sufficient thickness, the earth retaining panels 101 may be continuously installed in the hole axis direction without being staggeredly arranged. In this way, a plurality of the structures 201 are stacked along the hole axis direction (in the case of the illustrated example, three stages), and a part of the earth retaining structure 200 is constructed.

[0022] Next, as shown in FIG. 4(B), after fixing the structure 201 located at the uppermost stage to the ground 300 with the well girder 400, the excavation hole 301 outside the structure 201 is backfilled with the excavated soil. Note that 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.

[0023] Then, as shown in FIG. 4(C), while excavating the ground, the structure 201 is assembled and excavation proceeds to a predetermined depth. After fixing the structure 201 located at the uppermost stage with the shaft girder 400, the earth retaining panel 101 is arranged along the circumferential direction of the wall surface of the excavation hole 301 at the lower end of the upper structure 201, and is connected to the upper earth retaining panel 101 with bolts and nuts. At the same time, the adjacent earth retaining panels 101 on the left and right are connected with bolts and nuts to construct the lower structure 201. Note that between the earth retaining panel 101 and the excavation hole 301, concrete or mortar is filled as a backfill injection material.

[0024] 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 plan view, it may be circular, oval like an oval shape, or U-shaped like a horseshoe shape. The corrugated steel sheet 1 is configured in a shape corresponding to the shape of the earth retaining structure 200.

[0025] By the way, in the earth retaining structure 200, as the depth of the excavation hole 301 increases, the earth pressure from the ground side increases, and there may be a case where the rigidity is insufficient. In addition, regardless of the depth, due to soil conditions etc., the earth pressure may be large. Furthermore, as the depth in the hole axis direction increases, the self-weight of the structure 201 arranged above acts on the structure 201 arranged below.

[0026] Therefore, in the conventional earth retaining structure, at a location where the depth is deep, an H-shaped steel called a reinforcing ring is sandwiched between the structures 201 adjacent to each other vertically to increase the rigidity. The reinforcing ring is constructed by arranging a plurality of H-shaped steels along the circumferential direction of the excavation hole so that their flange portions face the ground side and the excavation side, and the flange portions of adjacent H-shaped steels are joined via joint plates. The joint plates are respectively applied to the flange portion on the ground side and the flange on the excavation side of the H-shaped steel, and are bolted to the flange portions of adjacent H-shaped steels respectively.

[0027] However, when joining the flange portions of adjacent H-shaped steels via a joint plate and bolt-joining the joint plate arranged on the ground side, in the case of bolt-joining, the operator had to bend down, reach around from the lower end of the earth-retaining structure under construction to the ground side, and tighten the bolts in a cramped posture. That is, the workability of bolt-joining on the ground side was poor, complicated, and time-consuming, so it was a heavy burden on the operator. As a result, there were problems such as a prolonged construction period and increased labor costs. Also, when arranging a plurality of H-shaped steels along the circumferential direction of the excavation hole 301 and connecting the left and right adjacent H-shaped steels with a flange joint, there were connection locations that were out of the operator's sight. Therefore, with this assembly work method, the work was in a state where visual inspection was difficult, it was impossible to confirm that the bolts were securely connected, and in addition to the difficulty of assembly, there were concerns about safety confirmation.

[0028] Therefore, the earth-retaining panel 100 according to the present embodiment is characterized in that it is configured to be able to omit the circumferential bolt-joining work between the reinforcing members 3 at the construction site. FIG. 5 is a perspective view showing the earth-retaining panel 100 according to Embodiment 1. FIG. 6 is a longitudinal sectional view showing the earth-retaining panel 100 according to Embodiment 1. FIG. 7 is a perspective view showing the reinforcing member 3 of the earth-retaining panel 100 according to Embodiment 1.

[0029] As shown in FIGS. 5 and 6, the earth-retaining panel 100 according to Embodiment 1 of the present invention includes a corrugated steel plate 1 formed such that the peak portions 1a and valley portions 1b of the corrugations extend along the longitudinal direction X, a pair of vertical flange portions 2 provided at both ends in the longitudinal direction X of the corrugated steel plate 1, and a reinforcing member 3 that extends along the longitudinal direction X of the corrugated steel plate 1 and is provided at the lower end portion of the corrugated steel plate 1.

[0030] The corrugated steel plate 1 and the vertical flange portion 2 have the same configuration as the above-described earth-retaining panel 101. That is, the corrugated steel plate 1 is configured by bending a rolled steel plate into a square wave shape so that the cross-sectional shape of the wave is a square wave. The square wave shape in the present embodiment is, for example, a trapezoidal wave shape with rounded corners. Further, as shown in FIGS. 5 and 6, the corrugated steel plate 1 has transverse flange portions 10 formed by bending both end edges of the wave at both ends in the short side direction Y. The vertical flange portion 2 is configured 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.

[0031] As shown in FIGS. 6 and 7, the reinforcing member 3 is a channel steel, and the inner bottom surface of the groove is arranged to face the lower end portion of the corrugated steel plate 1. As shown in FIG. 5, the reinforcing member 3 is arranged sandwiched between a pair of vertical flange portions 2, 2, and both end surfaces in the longitudinal direction X are butted against the inner surfaces of the vertical flange portions 2, and both end portions are welded and joined to the vertical flange portions 2. The width of the vertical flange portion 2 is formed in accordance with the width dimension of the web 30 of the reinforcing member 3. Note that the vertical flange portion 2 may be configured to have a width larger than the width dimension of the web 30 so as to protrude in the Z direction from the edge of the web 30 of the reinforcing member 3 and cover the reinforcing member 3. On the other hand, the reinforcing member 3 is not joined to the corrugated steel plate 1, and as shown in FIG. 6, the inner surface of the web 30 is arranged to abut against the transverse flange portion 10 of the corrugated steel plate 1. Thus, the reinforcing member 3 is configured to be integrated with the corrugated steel plate 1 and the vertical flange portion 2. Note that the reinforcing member 3 does not need to be joined to the corrugated steel plate 1, but there is no particular problem even if it is joined to the corrugated steel plate 1 by, for example, welding. 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 plate 1 for shape retention.

[0032] As shown in Fig. 6, the reinforcing member 3 is configured to have a size such that a gap S is formed between the flange 31 and the groove portion 1b. This is because a gap S is necessary for an operator to insert their hand or tools into the space of the groove portion 1b of the corrugated steel sheet 1 during the joining operation of the earth retaining panels 100A arranged vertically and horizontally. Further, as shown in Figs. 6 and 7, a joining hole 30a is formed in the web 30 of the reinforcing member 3 at a position corresponding to the connecting hole 10a formed in the horizontal flange portion 10 of the corrugated steel sheet 1.

[0033] Note that although the reinforcing member 3 is shown as being arranged at the lower end of the corrugated steel sheet 1, it is not limited thereto, and it may be arranged at the upper end and the lower end of the corrugated steel sheet 1 respectively.

[0034] Next, the connection structure of the earth retaining panel 100 according to the first embodiment will be described. The earth retaining panel 100 according to the first embodiment is arranged in the excavation hole 301 where high earth pressure acts or in the deep part of the excavation hole 301, and then is connected to the earth retaining panel 101 shown in Fig. 2 that has already been installed. When connecting the already installed upper earth retaining panel 101 and the earth retaining panel 100 according to the first embodiment, the horizontal flange portions 10 of each are abutted vertically to align the positions of the connecting holes 10a, the shaft portion of the bolt is passed through the respective connecting holes 10a, and the shaft portion is fastened with a nut. Incidentally, since the earth retaining panel 100 according to the first embodiment has a configuration in which the reinforcing member 3 is integrated with the corrugated steel sheet 1 and the vertical flange portion 2, the weight becomes large. However, when arranging the earth retaining panel 100 at a predetermined position in the excavation hole 301, it is handled by a heavy machine or the like, so the weight of the earth retaining panel 100 does not increase the burden on the operator. On the contrary, since the connection work becomes easier, the work efficiency is improved.

[0035] FIG. 8 is an explanatory view showing a state in which the earth retaining panels 100 according to the first embodiment are vertically arranged and connected. The upper earth retaining panel 100 has a configuration in which the reinforcing member 3 is provided only at the lower end portion of the corrugated steel plate 1. On the other hand, the lower earth retaining panel 100 has a configuration in which the reinforcing member 3 is provided at the upper end portion and the lower end portion of the corrugated steel plate 1. When the earth retaining panels 100 according to the first embodiment are vertically arranged and connected, as shown in FIG. 8, the outer surfaces of the webs 30 of the respective reinforcing members 3 are abutted vertically to align the positions of the connecting holes 10a and the joining holes 30a, and the shaft portion of the bolt 5 is passed through the respective connecting holes 10a and the joining holes 30a, and the shaft portion is fastened with the nut 6. Thereby, the reinforcing members 3 of the earth retaining panels 100 adjacent vertically are joined and connected with the bolt 5 and the nut 6 together with the horizontal flange portion 10 of the corrugated steel plate 1.

[0036] When the earth retaining panel 101 shown in FIG. 2 is arranged and connected to the lower part of the earth retaining panel 100 according to the first embodiment arranged at the lower stage, the horizontal flange portion 10 of the corrugated steel plate 1 of the lower earth retaining panel 101 is abutted against the outer surface of the web 30 of the reinforcing member 3 of the earth retaining panel 100 to align the positions of the respective connecting holes 10a and the joining holes 30a. Then, bolts are inserted through the connecting holes 10a and the joining holes 30a of the earth retaining panel 100 and the connecting holes 10a of the earth retaining panel 101, and the shaft portions of the bolts are fastened with nuts. In this way, the reinforcing member 3 of the earth retaining panel 100 is joined to the horizontal flange portion 10 of the earth retaining panel 101 with bolts and nuts together with the horizontal flange portion 10 of the corrugated steel plate 1.

[0037] FIG. 9 is an explanatory view showing a state in which the earth retaining panels 100 according to the first embodiment are arranged and connected in the circumferential direction of the excavation hole 301. As shown in FIG. 9, when connecting the earth retaining panels 100 adjacent to each other in the circumferential direction of the excavation hole 301, the vertical flange portions 2 adjacent to each other on the left and right are abutted against each other to align the positions of the connection holes 2a, and the shaft portion of the bolt 7 is passed through the respective connection holes 2a, and the shaft portion is fastened with the nut 8. That is, in the earth retaining panel 100 according to the first embodiment, by simply joining the vertical flange portions 2 of the earth retaining panels 100 adjacent to each other along the circumferential direction of the excavation hole 301, the adjacent reinforcing members 3 can be installed along the circumferential direction without bolt-joining the adjacent reinforcing members 3. Note that, instead of bolts and nuts, connecting tools such as clips may be used as means for connecting the earth retaining panels 100 adjacent to each other on the left and right.

[0038] As described above, the earth retaining panel 100 according to the first embodiment includes a corrugated steel plate 1 formed such that the wave crest portions 1a and the wave trough portions 1b extend along the longitudinal direction X, a pair of vertical flange portions 2 provided at both ends in the longitudinal direction X of the corrugated steel plate 1, and a reinforcing member 3 that extends along the longitudinal direction X of the corrugated steel plate 1 and is provided at at least one end of both ends in the short direction Y of the corrugated steel plate 1. The reinforcing member 3 is disposed sandwiched between the pair of vertical flange portions 2, 2, and both ends in the longitudinal direction X are joined to the inner surfaces of the vertical flange portions 2.

[0039] Therefore, the earth retaining panel 100 according to the first embodiment can be installed along the circumferential direction by joining the vertical flange portions 2 of the earth retaining panels 100 adjacent to each other along the circumferential direction of the excavation hole 301, without bolt-joining the adjacent reinforcing members 3 via a joint plate. Thus, the bolt-joining operation of the reinforcing members 3 at the construction site can be omitted, and the workability of the construction work can be improved. Further, the earth retaining panel 100 can achieve the same improvement in strength and rigidity as when the reinforcing members 3 are joined with a joint plate by joining the vertical flange portions 2, 2 to each other.

[0040] Note that FIG. 10 is a longitudinal sectional view showing a modified example of the earth retaining panel according to Embodiment 1. As shown in FIG. 10, instead of the above channel steel, an H-shaped steel may be used for the reinforcing member 3.

[0041] Embodiment 2. Next, the earth retaining panel 100A according to the present Embodiment 2 will be described with reference to FIGS. 11 and 12. FIG. 11 is a longitudinal sectional view showing the earth retaining panel 100A according to Embodiment 2. FIG. 12 is an explanatory view showing a state in which the earth retaining panels 100A according to Embodiment 2 are arranged vertically and connected. Note that the same components as those of the earth retaining panel 100 described in Embodiment 1 are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

[0042] The earth retaining panel 100A according to Embodiment 2 includes, as shown in FIG. 11, a corrugated steel plate 1 formed such that the peak portions 1a and the valley portions 1b of the waveform extend along the longitudinal direction X, a pair of vertical flange portions 2 provided at both ends in the longitudinal direction X of the corrugated steel plate 1, and a reinforcing member 3A that extends along the longitudinal direction X of the corrugated steel plate 1 and is provided at the lower end portion of the corrugated steel plate 1. The corrugated steel plate 1 and the vertical flange portions 2 have the same configuration as that of Embodiment 1.

[0043] As shown in FIG. 11, the reinforcing member 3A is a channel steel, and is arranged with the inner surface of the bend facing the lower end portion of the corrugated steel plate 1. Further, the reinforcing member 3A is arranged such that the side portion 33 of the bend is located on the natural ground side. By arranging the side portion 33 of the bend on the natural ground side, a working space can be secured on the inner surface side of the corrugated steel plate 1, and the presence of the reinforcing member 3A does not interfere with the work during the connection work of the earth retaining panels 100A arranged vertically, horizontally, and vertically, making the work easier.

[0044] The reinforcing member 3A is disposed sandwiched between a pair of vertical flange portions 2, with both end faces in the longitudinal direction X butted against the inner surfaces of the vertical flange portions 2, and both end portions are welded and joined to the vertical flange portions 2. The width of the vertical flange portions 2 is formed to match the width dimension of the bottom portion 32 of the reinforcing member 3A. On the other hand, the reinforcing member 3A is not joined to the corrugated steel sheet 1, and the bottom portion 32 is disposed in contact with the horizontal flange portion 10 of the corrugated steel sheet 1. Thus, the reinforcing member 3A has a configuration integrated with the corrugated steel sheet 1 and the vertical flange portions 2. Note that the reinforcing member 3A does not 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, for example, welding. For example, when the length of the reinforcing member 3A in the longitudinal direction X is long, intermittent welding may be performed on the corrugated steel sheet 1 for shape retention.

[0045] Further, as shown in FIG. 11, joining holes 30a are formed at positions corresponding to the connection holes 10a formed in the horizontal flange portion 10 of the corrugated steel sheet 1 in the bottom portion 32 of the reinforcing member 3A. Note that the reinforcing member 3A is shown as being disposed at the lower end portion of the corrugated steel sheet 1, but it is not limited thereto, and it may be disposed at the upper end portion and the lower end portion of the corrugated steel sheet 1, respectively.

[0046] The earth-retaining panel 100A according to the second embodiment is also connected to the already installed earth-retaining panel 101 after being disposed in the excavation hole 301 where high earth pressure acts or in a portion where the depth of the excavation hole 301 is deep. When connecting the already installed upper earth-retaining panel 101 and the earth-retaining panel 100A according to the second embodiment, the horizontal flange portions 10 of each other are butted vertically to align the positions of the connection holes 10a, the shaft portion of a bolt is passed through the connection holes 10a of each other, and the shaft portion is fastened with a nut.

[0047] FIG. 12 is an explanatory view showing a state in which the earth retaining panels 100A according to Embodiment 2 are arranged and connected vertically. The upper earth retaining panel 100A has a configuration in which the reinforcing member 3A is provided only at the lower end portion of the corrugated steel plate 1. On the other hand, the lower earth retaining panel 100A has a configuration in which the reinforcing member 3A is provided at the upper end portion and the lower end portion of the corrugated steel plate 1. When the earth retaining panels 100A according to Embodiment 2 are arranged and connected vertically, as shown in FIG. 12, the outer surfaces of the bottom portions 32 of the mutually reinforcing members 3A are abutted vertically to align the positions of the connecting holes 10a and the joining holes 30a, and the shaft portion of the bolt 5 is passed through the mutually connecting holes 10a and the joining holes 30a, and the shaft portion is fastened with the nut 6. Thereby, the reinforcing members 3A of the earth retaining panels 100A adjacent vertically are joined and connected with the bolt 5 and the nut 6 together with the horizontal flange portion 10 of the corrugated steel plate 1. Note that, as a means for connecting the corrugated steel plates 1 adjacent vertically, a connecting tool such as a clip may be used instead of the bolt 5 and the nut 6.

[0048] When the earth retaining panel 101 shown in FIG. 2 is arranged and connected to the lower portion of the earth retaining panel 100A according to Embodiment 2 arranged in the lower stage, the horizontal flange portion 10 of the corrugated steel plate 1 of the lower earth retaining panel 101 is abutted against the outer surface of the bottom portion 32 of the reinforcing member 3A of the earth retaining panel 100A to align the positions of the mutually connecting holes 10a and the joining holes 30a. Then, a bolt is inserted through the connecting holes 10a and the joining holes 30a of the earth retaining panel 100A and the connecting holes 10a of the earth retaining panel 101, and the shaft portion of the bolt is fastened with a nut. In this way, the reinforcing member 3A of the earth retaining panel 100A is joined to the horizontal flange portion 10 of the earth retaining panel 101 with a bolt and a nut together with the horizontal flange portion 10 of the corrugated steel plate 1. Note that, as a means for connecting the corrugated steel plates 1 adjacent vertically, a connecting tool such as a clip may be used instead of the bolt and the nut.

[0049] When connecting the earth retaining panels 100A adjacent to each other in the circumferential direction of the excavation hole 301, for example, as shown in FIG. 9, the vertical flange portions 2 adjacent to each other on the left and right are butted together to align the positions of the connecting holes 2a, the shaft portion of the bolt 7 is passed through the respective connecting holes 2a, and the shaft portion is fastened with the nut 8. That is, also in the earth retaining panel 100A according to the second embodiment, by simply joining the vertical flange portions 2 of the earth retaining panels 100A adjacent along the circumferential direction of the excavation hole 301, the reinforcing members 3A adjacent to each other can be installed along the circumferential direction without bolt-joining the adjacent reinforcing members 3A. Therefore, the bolt-joining work of the reinforcing members 3A at the construction site can be omitted, and the workability of the construction work can be improved. Note that, as a means for connecting the earth retaining panels 100A adjacent to each other on the left and right, instead of the bolts 7 and the nuts 8, a connecting tool such as a clip may be used.

[0050] Further, the earth retaining panel 100A according to the second embodiment has lower rigidity and strength compared to the earth retaining panel 100 having the reinforcing member 3 made of the channel steel described in the first embodiment, but a work space can be secured on the inner surface side of the corrugated steel plate 1. Therefore, during the joining work of the earth retaining panels 100A arranged vertically and horizontally, it is good for the workability of the workers who work inside the excavation hole 301.

[0051] Although not shown, instead of the above-mentioned angle steel, a T-shaped steel may be used for the reinforcing member 3A.

[0052] Embodiment 3. Next, the earth retaining panel 100B according to the third embodiment will be described with reference to FIG. 13. FIG. 13 is a longitudinal sectional view showing the earth retaining panel 100B according to the third embodiment. For the same components as the earth retaining panel 100 described in the first embodiment and the earth retaining panel 100A described in the second embodiment, the same reference numerals are given, and the description thereof will be omitted as appropriate.

[0053] As shown in FIG. 13, the earth retaining panel 100B according to Embodiment 3 includes a corrugated steel plate 11 formed such that the corrugated ridges 1a and valleys 1b extend along the longitudinal direction X, a pair of vertical flange portions 2 provided at both ends in the longitudinal direction X of the corrugated steel plate 11, and a reinforcing member 3 extending along the longitudinal direction X of the corrugated steel plate 11 and provided at the lower end portion of the corrugated steel plate 11.

[0054] The corrugated steel plate 11 of the earth retaining panel 100B according to Embodiment 3 is a so-called liner plate having a corrugated cross-section formed in a sine curve shape. The thickness of this corrugated steel plate 11 is, for example, about 2.7 mm to 7 mm. The corrugated steel plate 11 has lateral flange portions 10 formed by bending both ends of the corrugation at both ends in the short direction Y. A plurality of connecting holes 10a for connecting adjacent corrugated steel plates 11 stacked one above the other in the hole axis direction of the excavation hole 301 are formed along the longitudinal direction X in the lateral flange portions 10.

[0055] The vertical flange portions 2 and the reinforcing member 3 are the same as the configurations in Embodiments 1 and 2. The reinforcing member 3 may be the channel steel or H-shaped steel shown in Embodiment 1, or the angle steel or T-shaped steel shown in Embodiment 2. Although the reinforcing member 3 is shown as being disposed at the lower end portion of the corrugated steel plate 11, it is not limited thereto, and it may be disposed at the upper end portion and the lower end portion of the corrugated steel plate 11, respectively.

[0056] When the earth retaining panels 100B according to the present Embodiment 3 are arranged vertically and connected, for example, as shown in FIG. 8, the outer surfaces of the webs 30 of the mutually reinforcing members 3 are abutted vertically to align the positions of the connecting holes 10a and the joining holes 30a, the shaft portions of bolts 5 are passed through the mutually connecting holes 10a and the joining holes 30a, and the shaft portions are fastened with nuts 6. Thereby, the reinforcing members 3 of the earth retaining panels 100B adjacent vertically are joined and connected with bolts 5 and nuts 6 together with the lateral flange portions 10 of the corrugated steel plates 11. When the reinforcing member 3A described in Embodiment 2 is used, as a means for connecting adjacent corrugated steel plates 11 vertically, for example, a connector such as a clip may be used instead of the bolts 5 and the nuts 6.

[0057] When connecting the earth retaining panels 100B adjacent to each other in the circumferential direction of the excavation hole 301, for example, as shown in FIG. 9, the vertical flange portions 2 adjacent to each other on the left and right are butted together to align the positions of the connecting holes 2a, the shaft portion of the bolt 7 is passed through the respective connecting holes 2a, and the shaft portion is fastened with the nut 8. That is, the earth retaining panel 100B according to the third embodiment can also be installed along the circumferential direction by joining the vertical flange portions 2 of the earth retaining panels 100B adjacent to each other along the circumferential direction of the excavation hole 301, so that the adjacent reinforcing members 3 can be joined without bolt joining via the joint plate. Therefore, the bolt joining operation between the reinforcing members 3 at the construction site can be omitted, and the workability of the construction work can be improved. Note that, instead of the bolts 7 and the nuts 8, a connecting tool such as a clip may be used as a means for connecting the earth retaining panels 100B adjacent to each other on the left and right.

[0058] Embodiment 4. Next, the earth retaining panel 100C according to the fourth embodiment will be described with reference to FIGS. 14 and 15. FIG. 14 is a longitudinal sectional view showing the earth retaining panel 100C according to the fourth embodiment. Note that the same components as those of the earth retaining panels 100, 100A, and 100B described in the above embodiments are denoted by the same reference numerals, and the description thereof will be appropriately omitted.

[0059] As shown in FIG. 14, the earth retaining panel 100C according to the fourth embodiment includes a corrugated steel plate 12 formed such that the corrugated peaks 1a and valleys 1b extend along the longitudinal direction X, a pair of vertical flange portions 2 provided at both ends in the longitudinal direction X of the corrugated steel plate 12, and a reinforcing member 3 that extends along the longitudinal direction X of the corrugated steel plate 12 and is provided at the lower end portion of the corrugated steel plate 12.

[0060] The corrugated steel sheet 12 in the fourth embodiment is configured such that its corrugated cross-section is square-wave shaped. Compared with the corrugated steel sheet 1 in the first embodiment, the corrugated steel sheet 12 does not have a horizontal flange portion 10 at the lower end in the short side direction Y where the reinforcing member 3 is provided. As described in the first embodiment, the adjacent corrugated steel sheets 1 in the vertical direction are connected by butting the horizontal flange portions 10 and fastening the shaft portion of the bolt inserted through the connecting holes 10a with nuts. However, at the end in the short side direction Y where the reinforcing member 3 is provided, since the reinforcing member 3 also functions as the horizontal flange portion 10, it is not necessary to deliberately provide the horizontal flange portion 10. However, in the corrugated steel sheet 12 in the fourth embodiment, it is desirable to weld and integrate the edge of the waveform and the reinforcing member 3. It is not always necessary to weld the edge of the waveform and the reinforcing member 3 in the short side direction Y, but integration can be achieved by welding and the bearing capacity can be improved.

[0061] In addition, when the reinforcing members 3 are provided at both ends in the short side direction Y of the corrugated steel sheet 12 in the fourth embodiment, the horizontal flange portions 10 are not provided at both ends.

[0062] The earth retaining panel 100C according to the fourth embodiment is also connected to the already installed earth retaining panel 101 after being arranged in the excavation hole 301 where high earth pressure acts or in the deep part of the excavation hole 301. When connecting the already installed upper earth retaining panel 101 and the earth retaining panel 100C according to the fourth embodiment, the horizontal flange portions 10 of each other are butted vertically to align the positions of the connecting holes 10a, the shaft portion of the bolt is passed through the connecting holes 10a of each other, and the shaft portion is fastened with a nut.

[0063] FIG. 15 is an explanatory view showing a state in which the earth retaining panels 100C according to the fourth embodiment are vertically arranged and connected. The upper earth retaining panel 100C has a configuration in which the reinforcing member 3 is provided only at the lower end of the corrugated steel plate 12. The upper earth retaining panel 100C is not provided with the horizontal flange portion 10 at the lower end in the short side direction Y. On the other hand, the lower earth retaining panel 100C has a configuration in which the reinforcing member 3 is provided at the upper end and the lower end of the corrugated steel plate 12. The lower earth retaining panel 100C is not provided with the horizontal flange portion 10 at both ends in the short side direction Y. When the earth retaining panels 100C according to the fourth embodiment are vertically arranged and connected, as shown in FIG. 15, the outer surfaces of the webs 30 of the respective reinforcing members 3 are abutted vertically to align the positions of the joining holes 30a, and the shaft portion of the bolt 5 is passed through the respective joining holes 30a, and the shaft portion is fastened with the nut 6. Thereby, the adjacent earth retaining panels 100C in the vertical direction are connected by joining the reinforcing members 3 to each other with the bolt 5 and the nut 6.

[0064] When the earth retaining panel 101 shown in FIG. 2 is arranged and connected to the lower part of the earth retaining panel 100C according to the fourth embodiment arranged at the lower stage, the horizontal flange portion 10 of the corrugated steel plate 12 of the lower earth retaining panel 101 is abutted against the outer surface of the web 30 of the reinforcing member 3 of the earth retaining panel 100C, and the positions of the connecting hole 10a and the joining hole 30a are aligned. Then, a bolt is inserted through the joining hole 30a of the earth retaining panel 100C and the connecting hole 10a of the earth retaining panel 101, and the shaft portion of the bolt is fastened with a nut.

[0065] When connecting the earth-retaining panels 100C adjacent to each other in the circumferential direction of the excavation hole 301, for example, as shown in FIG. 9, the vertical flange portions 2 adjacent to each other on the left and right are butted together to align the positions of the connecting holes 2a, the shaft portion of the bolt 7 is passed through the respective connecting holes 2a, and the shaft portion is fastened with the nut 8. That is, the earth-retaining panel 100C according to the fourth embodiment also only joins the vertical flange portions 2 of the earth-retaining panels 100 adjacent to each other along the circumferential direction of the excavation hole 301, and the reinforcing members 3 adjacent to each other can be installed along the circumferential direction without bolt-joining the adjacent reinforcing members 3. Therefore, the bolt-joining work of the reinforcing members 3 at the construction site can be omitted, and the workability of the construction work can be improved. In addition, as a means for connecting the earth-retaining panels 100C adjacent to each other on the left and right, instead of the bolts 7 and the nuts 8, for example, a connecting tool such as a clip may be used.

[0066] As described above, the earth-retaining panel 100C according to the fourth embodiment has a configuration in which the horizontal flange portion 10 at at least one end in the short-side direction Y of the corrugated steel plate 12 is omitted, so that the manufacturing labor can be omitted and the material cost can be reduced, and as a result, the manufacturing cost can be reduced. Further, even when bending is required for application to, for example, a circular shaft, the earth-retaining panel 100C can be easily bent because it does not have the horizontal flange portion 10. Furthermore, since the earth-retaining panel 100C can be lightened by the amount of the horizontal flange portion 10 omitted, the burden of carrying is reduced, and the workability during construction can be improved.

[0067] Note that the retaining panel 100C according to the fourth embodiment has been described as having the reinforcing member 3 made of the channel steel described in the first embodiment, but this is not the only case. The retaining panel 100C may have the reinforcing member 3 made of the H-shaped steel shown in FIG. 10, the reinforcing member 3A made of the angle steel described in the second embodiment, or the reinforcing member made of the T-shaped steel. When the reinforcing member 3A described in the second embodiment is used, the means for connecting the corrugated steel plates 12 adjacent to each other vertically may use a connecting tool such as a clip instead of the bolts 5 and nuts 8. Further, the retaining panel 100C according to the fourth embodiment is not limited to the configuration having the corrugated steel plate 12 with a square-wave-shaped corrugated cross-section, and may have the corrugated steel plate 11 with a sine-curve-shaped corrugated cross-section described in the third embodiment.

[0068] As described above, the retaining panels (100, 100A, 100B, 100C) and the retaining structure 200 have been described based on the embodiments, but they are not limited to the configurations of the above-described embodiments. For example, the configurations of the above-described retaining panels (100, 100A, 100B, 100C) are merely examples, and may include other components. Also, the construction method of the retaining structure 200 described with reference to FIG. 4 is merely an example and is not limited to the above-described embodiments. In short, the retaining panels (100, 100A, 100B, 100C) and the retaining structure 200 include the scope of design changes and application variations that are normally made by those skilled in the art without departing from the technical idea thereof.

Description of Reference Numerals

[0069] 1 Corrugated steel plate, 1a Crest portion, 1b Trough portion, 1c Web, 2 Vertical flange portion, 2a Connecting hole, 3, 3A Reinforcing member, 30 Web, 30a Joining hole, 31 Flange, 32 Bottom portion, 33 Side portion, 4 Corner member, 5 Bolt, 6 Nut, 7 Bolt, 8 Nut, 10 Horizontal flange portion, 10a Connecting hole, 11 Corrugated steel plate, 12 Corrugated steel plate, 100, 100A, 100B, 100C, 101, 102 Retaining panel, 200 Retaining structure, 201 Structure, 300 Ground surface, 301 Excavation hole, 400 Shoring frame, X Longitudinal direction, Y Lateral direction, S Gap.

Claims

1. An earth retaining panel used for constructing an earth retaining structure by being installed in an excavation hole formed by excavating the ground, comprising: A corrugated steel plate formed such that corrugated ridges and valleys extend along the longitudinal direction; A pair of vertical flange portions provided at both longitudinal ends of the corrugated steel plate; A reinforcing member extending along the longitudinal direction of the corrugated steel plate and provided at at least one end of both ends in the short direction of the corrugated steel plate; The reinforcing member is disposed sandwiched between the pair of vertical flange portions, and both longitudinal ends are joined to the inner surfaces of the vertical flange portions; The corrugated steel plate has a horizontal flange portion at at least one end of both ends in the short direction; The reinforcing member is provided along the horizontal flange portion, the earth retaining panel.

2. The earth retaining panel according to claim 1, wherein the reinforcing member is a channel steel, and the inner surface of the bend is disposed facing the upper end or the lower end of the corrugated steel plate.

3. An earth retaining panel used for constructing an earth retaining structure by being installed in an excavation hole formed by excavating the ground, comprising: A corrugated steel plate formed such that corrugated ridges and valleys extend along the longitudinal direction; A pair of vertical flange portions provided at both longitudinal ends of the corrugated steel plate; A reinforcing member extending along the longitudinal direction of the corrugated steel plate and provided at at least one end of both ends in the short direction of the corrugated steel plate; The reinforcing member is disposed sandwiched between the pair of vertical flange portions, and both longitudinal ends are joined to the inner surfaces of the vertical flange portions; The reinforcing member is a channel steel, and the inner bottom surface of the groove is disposed facing the upper end or the lower end of the corrugated steel plate, the earth retaining panel.

4. The earth retaining panel according to claim 3, wherein the corrugated steel plate has a horizontal flange portion at at least one end of both ends in the short direction.

5. The earth retaining panel according to any one of claims 1 to 4, wherein the corrugated steel plate has a square wave-shaped cross section.

6. The earth retaining panel according to any one of claims 1 to 4, wherein the corrugated steel plate has a sine curve-shaped cross section.

7. An earth retaining panel used for constructing an earth retaining structure by being installed in an excavation hole formed by excavating the ground, comprising: A corrugated steel plate formed such that corrugated ridges and valleys extend along the longitudinal direction; A pair of longitudinal flange portions provided at both longitudinal ends of the corrugated steel plate; A reinforcing member extending along the longitudinal direction of the corrugated steel plate and provided at at least one of both short ends of the corrugated steel plate; and, The reinforcing member is disposed between the pair of longitudinal flange portions, and both longitudinal ends are joined to the inner surfaces of the longitudinal flange portions. The corrugated steel plate has a configuration in which the corrugated cross section is formed in a square wave shape or a sine curve shape. The corrugated steel plate has a transverse flange portion at at least one of both short ends. A plurality of connecting holes are formed along the longitudinal direction in the transverse flange portion of the corrugated steel plate. The reinforcing member is a retaining panel in which joining holes are formed at positions corresponding to the connecting holes.

8. A retaining structure including a structure in which a plurality of the retaining panels according to any one of Claims 1 to 7 are arranged along the wall surface of the excavation hole and the retaining panels are connected and assembled to each other.

9. The retaining structure according to Claim 8, wherein the adjacent retaining panels in the circumferential direction of the excavation hole are joined and connected with the adjacent longitudinal flange portions being joined.

10. The retaining structure according to Claim 8 or 9, wherein the adjacent retaining panels in the hole axis direction of the excavation hole are abutted and joined with adjacent reinforcing members or between an adjacent reinforcing member and a short end of the corrugated steel plate.

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