JP7706344B2 - Earth retaining panel and earth retaining structure using said earth retaining panel - Google Patents

Description

The present invention relates to earth retaining panels and earth retaining structures using earth retaining panels.

As disclosed in Patent Document 1, for example, there is a known earth retaining structure constructed by assembling earth retaining panels made of corrugated steel plates in a borehole formed by excavating the ground. The earth retaining structure is constructed by stacking structures formed by arranging multiple corrugated steel plates in a ring shape along the wall surface of the borehole in the axial direction of the hole.

As the depth of an excavation hole increases, the earth pressure from the ground increases, and corrugated steel plates alone may not provide sufficient rigidity. In addition, regardless of the depth, the earth pressure may be high depending on the soil conditions. Furthermore, as the depth in the direction of the hole axis increases, the weight of the structure placed above acts on the structure placed below. For this reason, in soil retaining structures, in areas where rigidity is insufficient, H-shaped steel called reinforcing rings are sandwiched between adjacent corrugated steel plates above and below to increase rigidity.

The reinforcing ring is constructed by arranging multiple H-shaped steel beams along the circumferential direction of the drilled hole with their flanges facing the natural ground side and the drilling side, and joining the flanges of adjacent H-shaped steel beams via joint plates. The joint plates are placed on the flanges of the H-shaped steel beams facing the natural ground side and the drilling side, respectively, and are bolted to the flanges of adjacent H-shaped steel beams.

JP 2020-066845 A

However, when connecting the flanges of adjacent H-shaped steel beams via joint plates, if the joint plates arranged on the natural ground side are to be bolted together, the worker is forced to bend over and go around to the natural ground from the bottom end of the retaining structure under construction, and tighten the bolts in an uncomfortable position. In other words, the bolt connection on the natural ground side is difficult, cumbersome, and time-consuming, which places a heavy burden on the worker. As a result, there is a problem that the construction period is extended and the construction costs increase. In addition, when multiple H-shaped steel beams are arranged around the circumferential direction of the borehole and adjacent H-shaped steel beams on the left and right are connected with flange joints, there are connection points that the worker cannot see. Therefore, with this assembly method, the work is done in a state where it is difficult to see, making assembly difficult and raising concerns about safety confirmation.

The present invention aims to solve the above problems by providing an earth retaining panel and an earth retaining structure using the earth retaining panel, which eliminates the need for bolting work between reinforcing members at the construction site.

The earth-retaining panel of the present invention is an earth-retaining panel used to construct an earth-retaining structure by being installed in an excavation hole formed by excavating the ground, and comprises a corrugated steel plate formed so that the corrugated peaks and valleys extend along the longitudinal direction, 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 lateral ends of the corrugated steel plate, wherein the reinforcing member is sandwiched between the pair of vertical flange portions and both longitudinal ends are joined to the inner surface of the vertical flange portions, the corrugated steel plate has a horizontal flange portion at at least one of both lateral ends, and the reinforcing member is provided along the horizontal flange portion .

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

In the present invention, the reinforcing member is sandwiched between a pair of vertical flanges, and both longitudinal ends of the reinforcing member are joined to the inner surface of the vertical flanges. By joining the vertical flanges of adjacent earth retaining panels along the circumferential direction of the excavation hole, adjacent reinforcing members can be installed along the circumferential direction without bolting them together via joint plates. This eliminates the need to bolt reinforcing members together at the construction site, improving the workability of the construction work.

FIG. 2 is a perspective view showing a schematic example of an earth retaining structure. FIG. 2 is an oblique view showing an example of an earth retaining panel that constitutes an earth retaining structure. FIG. 2 is a vertical cross-sectional view showing an example of an earth retaining panel that constitutes an earth retaining structure. FIG. 1 is an explanatory diagram showing a schematic example of a construction method for a retaining structure. An oblique view showing an earth retaining panel according to embodiment 1. A vertical cross-sectional view showing an earth retaining panel according to embodiment 1. An oblique view showing a reinforcing member of the retaining panel in embodiment 1. An explanatory diagram showing the state in which the retaining panels of embodiment 1 are arranged vertically and connected. An explanatory diagram showing the state in which the retaining panels of embodiment 1 are arranged and connected circumferentially around an excavation hole. A vertical cross-sectional view showing a modified example of the retaining panel of embodiment 1. A vertical cross-sectional view showing an earth retaining panel according to embodiment 2. An explanatory diagram showing the state in which retaining panels of embodiment 2 are arranged above and below and connected. A vertical cross-sectional view showing an earth retaining panel according to embodiment 3. A vertical cross-sectional view showing an earth retaining panel according to embodiment 4. An explanatory diagram showing the state in which retaining panels of embodiment 4 are arranged above and below and connected.

Below, an embodiment of the present invention will be described with reference to the drawings. In each drawing, the same or corresponding parts are given the same reference numerals, and their description will be omitted or simplified as appropriate. Furthermore, the shape, size, arrangement, etc. of the configurations shown in each drawing can be changed as appropriate within the scope of the present invention. Furthermore, in this embodiment, terms indicating directions (e.g., up, down, left, right, vertical, horizontal, etc.) are used as appropriate to facilitate understanding, but these notations are for the convenience of explanation and do not limit the arrangement, direction, or orientation of devices, instruments, or parts, etc.

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 showing a schematic example of the earth retaining structure 200. Fig. 2 is a perspective view showing an example of an earth retaining panel 101 constituting the earth retaining structure 200. Fig. 3 is a vertical cross-sectional view showing an example of the earth retaining panel 101 constituting the earth retaining structure 200. The earth retaining structure 200 is constructed when constructing a civil engineering structure such as a shaft for constructing the foundation of an architectural structure or a drainage well constructed in the ground. The earth retaining structure 200 is constructed by stacking annular structures 201 as shown in Fig. 1 in a plurality of stages along the axial direction of the borehole in a vertical borehole formed by excavating the ground.

Each structure 201 constituting the earth retaining structure 200 is formed by arranging a plurality of earth retaining panels 101 with the same section modulus in a ring shape. As shown in Figures 2 and 3, the earth retaining panel 101 comprises a corrugated steel plate 1 formed so that the corrugated peaks 1a and valleys 1b extend along the longitudinal direction X, and vertical flanges 2 provided at both ends of the corrugated steel plate 1 in the longitudinal direction X.

The corrugated steel sheet 1 is formed by bending a rolled steel sheet into a corrugated shape so that the corrugated cross section has a corrugated shape. In the present embodiment, the corrugated shape is, for example, a trapezoidal corrugated shape with rounded corners. As an example, the corrugated steel sheet 1 is composed of three peaks 1a and two valleys 1b. However, the number of peaks 1a and valleys 1b is not limited to the number shown in the figure. The peaks 1a and valleys 1b are formed to be approximately parallel. The corrugated steel sheet 1 is formed by slightly inclining the web 1c connecting the peaks 1a and valleys 1b with respect to the horizontal direction so that the bottom of the valleys 1b is narrow. By slightly inclining the web 1c, it becomes easier to release the web 1c when performing plastic processing for corrugation, and manufacturing becomes easier. In addition, by reducing the inclination angle of the web 1c connecting the peaks 1a and valleys 1b, the corrugated steel sheet 1 widens the space between the peaks 1a and valleys 1b, and the rigidity increases when a bending moment is applied in the planar direction. This is because the section modulus of the corrugated steel sheet 1 at the neutral axis of bending increases as the width of the peaks 1a and valleys 1b increases. The inclination angle of the web 1c of the corrugated steel sheet 1 with respect to the horizontal direction is set to 0° or more and 20° or less, and more preferably 0° or more and 3° or less.

The corrugated steel sheet 1 has a thickness of, for example, about 2.7 mm to 7 mm. The plate thickness of the peaks 1a and valleys 1b is formed to be the same as that of the web 1c, but may be thicker than that of the web 1c. By configuring it in this way, the cross-sectional area of the peaks 1a and valleys 1b far from the neutral axis becomes larger, and the section modulus of the corrugated steel sheet 1 can be further increased.

2 and 3, the corrugated steel plate 1 has horizontal flanges 10 formed by bending both ends of the corrugated shape at both ends in the short direction Y. The horizontal flanges 10 are flat portions formed almost perpendicular to the hole axis direction. The horizontal flanges 10 have a plurality of connecting holes 10a formed along the longitudinal direction X for connecting adjacent corrugated steel plates stacked in the hole axis direction of the drilling hole. The vertically adjacent corrugated steel plates 1 are connected by butting the horizontal flanges 10 together and fastening the shafts of the bolts inserted into the connecting holes 10a with nuts. The means for connecting the horizontal flanges 10 of the vertically adjacent corrugated steel plates 1 may be, for example, a connecting device such as a clip. The number of connecting holes 10a shown in the figure is an example and is not limited thereto.

The vertical flange portion 2 is configured by welding plates to both ends of the corrugated steel plate 1 in the longitudinal direction X. The thickness of the vertical flange portion 2 is determined according to the strength and rigidity required for the earth retaining structure 200. The vertical flange portion 2 has a plurality of connecting holes 2a formed along the vertical direction (Y direction) for connecting the left and right adjacent earth retaining panels 101 arranged in the circumferential direction of the excavation hole. The left and right adjacent earth retaining panels 101 are connected by butting the vertical flange portions 2 together and fastening the shaft portions of the bolts inserted into the connecting holes 2a with nuts. Note that the means for connecting the vertical flange portions 2 of the left and right adjacent earth retaining panels 101 may be, for example, a connecting tool such as a clip. In addition, the number of connecting holes 2a shown in the figure is one example and is not limited thereto. Note that, as shown in FIG. 1, the rectangular corners of the structure 201 are provided with corner retaining panels 102 for corner portions processed into an L-shape via corner members 4. The corrugated steel plate 1 and vertical flange portion 2 that make up the retaining panel 102 are the same as those described above.

The cross-sectional shape of the retaining panel 101 shown in Figures 1 to 3 is merely an example, and may be shaped, for example, as a sine curve, or may be another shape.

Next, an example of a construction method for the earth retaining structure 200 will be described with reference to FIG. 4. FIG. 4 is an explanatory diagram that shows a schematic diagram of an example of a construction method for the earth retaining structure 200. First, as shown in FIG. 4(A), a borehole 301 for constructing the earth retaining structure 200 is formed in the ground 300. The borehole 301 is formed with an outer diameter, for example, about 20 cm larger than the outer diameter of the earth retaining structure 200. The depth of the borehole 301 is, for example, about 0.5 m to 1.5 m. Then, the retaining panel 101 is arranged in a ring shape along the wall surface of the borehole 301 to assemble the structure 201. The retaining panel 101 is arranged so that the peak portion 1a faces the natural ground side and the valley portion 1b faces the excavation side. The natural ground side is the outer surface side of the retaining panel 101, and the excavation side is the inner surface side of the retaining panel 101.

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 adjacent earth retaining panels 101 on the left and right with bolts and nuts. The earth retaining panels 101 of the upper structure 201 and the lower structure 201 are connected with bolts and nuts. The upper and lower earth retaining panels 101 are arranged with their circumferential positions shifted so as to be in a staggered arrangement. This allows the earth retaining structure 200 to suppress variations in strength and rigidity at each position in the circumferential direction. However, if the vertical flange portion 2 has a sufficient thickness, the earth retaining panels 101 may be installed continuously in the hole axis direction without being staggered. In this way, a part of the earth retaining structure 200 is constructed by stacking the structures 201 in multiple stages along the hole axis direction (three stages in the illustrated example).

Next, as shown in FIG. 4(B), the structure 201 located at the top is fixed to the ground 300 with a lattice 400, and the excavated hole 301 outside the structure 201 is backfilled with excavated soil. Note that the means for fixing the structure 201 located at the top to the ground 300 is not limited to the lattice 400, and concrete may be used, for example.

As shown in FIG. 4(C), the structure 201 is assembled while excavating the ground, and excavation is continued to a specified depth. After the structure 201 located at the top level is fixed with the lattice 400, the retaining panel 101 is placed at the bottom end of the upper level structure 201 along the circumferential direction of the wall surface of the excavation hole 301, and is connected to the upper level retaining panel 101 with bolts and nuts, and the retaining panels 101 adjacent to the left and right are connected with bolts and nuts to construct the lower level structure 201. Concrete or mortar is filled between the retaining panel 101 and the excavation hole 301 as a backfill injection material.

In this way, the retaining structure 200 is constructed by stacking annular structures 201 as shown in FIG. 1 in multiple stages along the axial direction of a vertical borehole 301 formed by excavating the ground 300. Note that the retaining structure 200 is not limited to the rectangular shape shown in FIG. 1, and may be, for example, a circular shape, an oval shape like an oval coin, or a U-shape like a horseshoe when viewed from above. The corrugated steel plate 1 is configured in a shape that corresponds to the shape of the retaining structure 200.

However, as the depth of the excavation hole 301 increases, the retaining structure 200 may become insufficient in rigidity due to the increased earth pressure from the ground. In addition, regardless of the depth, the earth pressure may be large due to soil conditions, etc. Furthermore, as the depth in the hole axis direction increases, the weight of the structure 201 located above acts on the structure 201 located below.

For this reason, in conventional earth retaining structures, in deep locations, H-shaped steel beams called reinforcing rings are sandwiched between adjacent structures 201 above and below to increase rigidity. The reinforcing ring is constructed by arranging multiple H-shaped steel beams along the circumferential direction of the excavation hole with their flanges facing the natural ground side and the excavation side, and joining the flanges of adjacent H-shaped steel beams via joint plates. The joint plates are placed on the flanges of the H-shaped steel beams facing the natural ground side and the excavation side, respectively, and are bolted to the flanges of adjacent H-shaped steel beams.

However, when connecting the flanges of adjacent H-shaped steels via joint plates, if the joint plates arranged on the natural ground side are to be bolted, the worker is forced to bend over and go around from the lower end of the retaining structure under construction to the natural ground side, and tighten the bolts in a cramped position. In other words, the bolt connection on the natural ground side is difficult, cumbersome, and time-consuming, which places a heavy burden on the worker. As a result, there is a problem that the construction period is extended and the construction costs increase. In addition, when multiple H-shaped steels are arranged along the circumferential direction of the borehole 301 and adjacent H-shaped steels on the left and right are connected with flange joints, there are connection points that the worker cannot see. Therefore, with this assembly method, the work is done in a state where it is difficult to visually check, and it is not possible to confirm that the bolts are securely connected, making assembly difficult and raising concerns about safety confirmation.

The earth-retaining panel 100 according to this embodiment is characterized by a configuration that eliminates the need for circumferential bolt fastening work between the reinforcing members 3 at the construction site. Figure 5 is a perspective view of the earth-retaining panel 100 according to the first embodiment. Figure 6 is a vertical cross-sectional view of the earth-retaining panel 100 according to the first embodiment. Figure 7 is a perspective view of the reinforcing member 3 of the earth-retaining panel 100 according to the first embodiment.

As shown in Figures 5 and 6, the retaining panel 100 according to this embodiment 1 comprises a corrugated steel plate 1 in which the corrugated peaks 1a and valleys 1b extend along the longitudinal direction X, a pair of vertical flanges 2 provided at both ends of the corrugated steel plate 1 in the longitudinal direction X, and a reinforcing member 3 extending along the longitudinal direction X of the corrugated steel plate 1 and provided at the lower end of the corrugated steel plate 1.

The corrugated steel plate 1 and the vertical flange portion 2 have the same configuration as the earth retaining panel 101 described above. In other words, the corrugated steel plate 1 is configured by bending a rolled steel plate into a square wave shape so that the corrugated cross section has a square wave shape. In this embodiment, the square wave shape is, for example, a trapezoidal wave shape with rounded corners. As shown in Figures 5 and 6, the corrugated steel plate 1 has horizontal flange portions 10 formed by bending both ends of the corrugated shape at both ends in the short direction Y. The vertical flange portion 2 is configured by welding plates to both ends of the corrugated steel plate 1 in the longitudinal direction X. The thickness of the vertical flange portion 2 is determined according to the strength and rigidity required for the earth retaining structure 200.

As shown in Figs. 6 and 7, the reinforcing member 3 is a channel steel, and is arranged so that the inner bottom surface of the groove faces the lower end of the corrugated steel plate 1. As shown in Fig. 5, the reinforcing member 3 is sandwiched between a pair of vertical flange portions 2, 2, and both end faces in the longitudinal direction X are butted against the inner surface of the vertical flange portion 2, and both end portions are welded and joined to the vertical flange portion 2. The vertical flange portion 2 has a width that matches the width dimension of the web 30 of the reinforcing member 3. The vertical flange portion 2 may be configured to be larger in width than the width dimension of the web 30 of the reinforcing member 3 so as to protrude from the edge of the web 30 of the reinforcing member 3 in the Z direction and to be attached so as to cover the reinforcing member 3. On the other hand, the reinforcing member 3 is not joined to the corrugated steel plate 1, and is arranged so that the inner surface of the web 30 abuts against the horizontal flange portion 10 of the corrugated steel plate 1 as shown in Fig. 6. In this way, the reinforcing member 3 is configured to be integrated with the corrugated steel plate 1 and the vertical flange portion 2. The reinforcing member 3 does not need to be joined to the corrugated steel plate 1, but there is no problem if it is joined to the corrugated steel plate 1 by, for example, welding. For example, the reinforcing member 3 may be intermittently welded to the corrugated steel plate 1 to maintain its shape when the length in the longitudinal direction X is long.

As shown in FIG. 6, the reinforcing member 3 is configured to a size that allows a gap S to be formed between the flange 31 and the valley portion 1b. This is because, when joining the retaining panels 100A arranged vertically and horizontally, the gap S is necessary for the worker to insert his/her hand or tool into the space in the valley portion 1b of the corrugated steel plate 1. Also, as shown in FIG. 6 and FIG. 7, the web 30 of the reinforcing member 3 has a connection hole 30a formed at a position corresponding to the connection hole 10a formed in the horizontal flange portion 10 of the corrugated steel plate 1.

Although the reinforcing member 3 is shown arranged at the lower end of the corrugated steel plate 1, this is not limited thereto, and the reinforcing member 3 may be arranged at both the upper and lower ends of the corrugated steel plate 1.

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 connected to the already installed earth retaining panel 101 shown in FIG. 2 after being placed in the excavation hole 301 or the deep part of the excavation hole 301 where high earth pressure acts. When connecting the already installed upper earth retaining panel 101 and the earth retaining panel 100 according to the first embodiment, the horizontal flange parts 10 are butted up and down to align the positions of the connection holes 10a, the shaft parts of the bolts are passed through the connection holes 10a, and the shaft parts are fastened with nuts. Incidentally, the earth retaining panel 100 according to the first embodiment is configured such that the reinforcing member 3 is integrated with the corrugated steel plate 1 and the vertical flange part 2, so that the weight is large. However, when the earth retaining panel 100 is placed at a predetermined position in the excavation hole 301, it is handled by heavy machinery, etc., so the heavy weight of the earth retaining panel 100 does not increase the burden on the worker, and rather, the connection work is made easier, improving the work efficiency.

Figure 8 is an explanatory diagram showing the state in which the retaining panels 100 according to the first embodiment are arranged vertically and connected. The upper retaining panel 100 has a configuration in which the reinforcing member 3 is provided only at the lower end of the corrugated steel plate 1. On the other hand, the lower retaining panel 100 has a configuration in which the reinforcing member 3 is provided at the upper and lower ends of the corrugated steel plate 1. When the retaining panels 100 according to the first embodiment are arranged vertically and connected, as shown in Figure 8, the outer surfaces of the webs 30 of the reinforcing members 3 are butted vertically to align the connection holes 10a and the joint holes 30a, and the shafts of the bolts 5 are passed through the connection holes 10a and the joint holes 30a, and the shafts are fastened with nuts 6. As a result, the reinforcing members 3 of the retaining panels 100 adjacent to each other vertically are joined and connected together with the horizontal flanges 10 of the corrugated steel plate 1 by the bolts 5 and nuts 6.

When the earth retaining panel 101 shown in FIG. 2 is placed and connected to the bottom of the earth retaining panel 100 according to the present embodiment 1 placed in the lower tier, the horizontal flange portion 10 of the corrugated steel plate 1 of the lower earth retaining panel 101 is butted against the outer surface of the web 30 of the reinforcing member 3 of the earth retaining panel 100, and the positions of the connection holes 10a and the joint holes 30a are aligned. Then, a bolt is inserted into the connection hole 10a and the joint hole 30a of the earth retaining panel 100 and the connection hole 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 3 of the earth retaining panel 100 is joined to the horizontal flange portion 10 of the earth retaining panel 101 together with the horizontal flange portion 10 of the corrugated steel plate 1 with the bolt and nut.

9 is an explanatory diagram showing the state in which the 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 adjacent retaining panels 100 in the circumferential direction of the excavation hole 301, 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 portions of the bolts 7 are passed through the connecting holes 2a, and the shaft portions are fastened with nuts 8. In other words, in the retaining panels 100 according to the first embodiment, the vertical flange portions 2 of the retaining panels 100 adjacent to each other along the circumferential direction of the excavation hole 301 are simply joined together, and the reinforcing members 3 can be installed along the circumferential direction without bolting the adjacent reinforcing members 3 together. Note that the means for connecting adjacent retaining panels 100 on the left and right may be, instead of bolts and nuts, a connector such as a clip.

As described above, the retaining panel 100 according to the first embodiment includes a corrugated steel plate 1 in which the crests 1a and valleys 1b of the corrugations are formed to extend along the longitudinal direction X, a pair of vertical flanges 2 provided at both ends of the corrugated steel plate 1 in the longitudinal direction X, and a reinforcing member 3 extending along the longitudinal direction X of the corrugated steel plate 1 and provided at least one of both ends of the corrugated steel plate 1 in the lateral direction Y. The reinforcing member 3 is sandwiched between the pair of vertical flanges 2, 2, and both ends in the longitudinal direction X are joined to the inner surface of the vertical flanges 2.

Therefore, the retaining panel 100 according to the first embodiment can be installed in the circumferential direction of the excavation hole 301 by joining the vertical flange portions 2 of adjacent retaining panels 100 in the circumferential direction, without bolting adjacent reinforcing members 3 together via joint plates. This eliminates the need to bolt reinforcing members 3 together at the construction site, improving the workability of construction work. In addition, by joining the vertical flange portions 2, 2 together, the retaining panel 100 can achieve the same improvement in strength and rigidity as when reinforcing members 3 are joined together with joint plates.

Figure 10 is a vertical cross-sectional view showing a modified example of the retaining panel according to the first embodiment. As shown in Figure 10, the reinforcing member 3 may be an H-shaped steel instead of the channel steel.

Embodiment 2.
Next, the soil retaining panel 100A according to the second embodiment will be described with reference to Figures 11 and 12. Figure 11 is a vertical cross-sectional view showing the soil retaining panel 100A according to the second embodiment.
12 is an explanatory diagram showing a state in which the retaining panels 100A according to the second embodiment are arranged and connected to each other above and below. Note that the same components as those of the retaining panels 100 described in the first embodiment are given the same reference numerals, and the description thereof will be omitted as appropriate.

As shown in FIG. 11, the retaining panel 100A according to the second embodiment includes a corrugated steel plate 1 in which the crests 1a and valleys 1b of the corrugations are formed to extend along the longitudinal direction X, a pair of vertical flanges 2 provided at both ends of the corrugated steel plate 1 in the longitudinal direction X, and a reinforcing member 3A extending along the longitudinal direction X of the corrugated steel plate 1 and provided at the lower end of the corrugated steel plate 1. The corrugated steel plate 1 and the vertical flanges 2 have the same configuration as in the first embodiment.

As shown in FIG. 11, the reinforcing member 3A is an angle steel, and is arranged with the inner surface of the bend facing the lower end of the corrugated steel plate 1. The reinforcing member 3A is also arranged so that the side 33 of the bend is located on the ground side. By arranging the side 33 of the bend on the ground side, a working space can be secured on the inner surface side of the corrugated steel plate 1, and when connecting the retaining panels 100A arranged above, below, left and right, the presence of the reinforcing member 3A does not get in the way, making the work easier.

The reinforcing member 3A is sandwiched between a pair of vertical flanges 2, and both end faces in the longitudinal direction X are butted against the inner surface of the vertical flanges 2, and both end portions are welded and joined to the vertical flanges 2. The vertical flanges 2 are formed to have a width that matches the width dimension of the bottom 32 of the reinforcing member 3A. On the other hand, the reinforcing member 3A is not joined to the corrugated steel plate 1, and the bottom 32 is placed in contact with the horizontal flanges 10 of the corrugated steel plate 1. In this way, the reinforcing member 3A is integrated with the corrugated steel plate 1 and the vertical flanges 2. Note that the reinforcing member 3A does not need to be joined to the corrugated steel plate 1, but there is no particular problem if it is joined to the corrugated steel plate 1 by welding or the like. For example, the reinforcing member 3A may be intermittently welded to the corrugated steel plate 1 to maintain its shape, for example, when the length in the longitudinal direction X is long.

In addition, as shown in FIG. 11, a connection hole 30a is formed in the bottom 32 of the reinforcing member 3A at a position corresponding to the connection hole 10a formed in the horizontal flange portion 10 of the corrugated steel plate 1. Note that, although the reinforcing member 3A is shown to be arranged at the lower end of the corrugated steel plate 1, this is not limited thereto, and it may be arranged at both the upper end and the lower end of the corrugated steel plate 1.

The retaining panel 100A according to the second embodiment is also connected to the already installed retaining panel 101 after being placed in the excavation hole 301 or in a deep portion of the excavation hole 301 where high earth pressure acts. When connecting the already installed upper retaining panel 101 to the retaining panel 100A according to the second embodiment, the horizontal flanges 10 are butted together vertically to align the connecting holes 10a, and the bolt shafts are passed through the connecting holes 10a and fastened with nuts.

Figure 12 is an explanatory diagram showing the state in which the retaining panels 100A according to the second embodiment are arranged vertically and connected. The upper retaining panel 100A has a configuration in which the reinforcing member 3A is provided only at the lower end of the corrugated steel plate 1. On the other hand, the lower retaining panel 100A has a configuration in which the reinforcing member 3A is provided at the upper and lower ends of the corrugated steel plate 1. When the retaining panels 100A according to the second embodiment are arranged vertically and connected, as shown in Figure 12, the outer surfaces of the bottoms 32 of the reinforcing members 3A are butted vertically to align the positions of the connecting holes 10a and the joint holes 30a, and the shafts of the bolts 5 are passed through the connecting holes 10a and the joint holes 30a, and the shafts are fastened with nuts 6. As a result, the reinforcing members 3A of the retaining panels 100A adjacent to each other vertically are joined and connected together with the horizontal flanges 10 of the corrugated steel plate 1 by the bolts 5 and nuts 6. In addition, the means for connecting adjacent corrugated steel plates 1 vertically may be a connector such as a clip instead of the bolts 5 and nuts 6.

When the earth retaining panel 101 shown in FIG. 2 is placed and connected to the bottom of the earth retaining panel 100A according to the second embodiment arranged in the lower tier, the horizontal flange portion 10 of the corrugated steel plate 1 of the lower earth retaining panel 101 is butted against the outer surface of the bottom 32 of the reinforcing member 3A of the earth retaining panel 100A, and the positions of the connection holes 10a and the joint holes 30a are aligned. Then, a bolt is inserted into the connection hole 10a and the joint hole 30a of the earth retaining panel 100A and the connection hole 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 together with the horizontal flange portion 10 of the corrugated steel plate 1 by the bolt and nut. Note that the means for connecting the corrugated steel plates 1 adjacent to each other vertically may be a connector such as a clip instead of a bolt and a nut.

When connecting adjacent earth retaining panels 100A 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 connection holes 2a, the shaft portions of the bolts 7 are passed through the connection holes 2a, and the shaft portions are fastened with nuts 8. In other words, the earth retaining panels 100A according to the second embodiment can also be installed in the circumferential direction by simply joining the vertical flange portions 2 of the earth retaining panels 100A adjacent to each other along the circumferential direction of the excavation hole 301, without bolting the adjacent reinforcing members 3A to each other. 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 the means for connecting the earth retaining panels 100A adjacent to each other on the left and right may be a connector such as a clip instead of the bolts 7 and nuts 8.

In addition, the retaining panel 100A according to the second embodiment has lower rigidity and strength than the retaining panel 100 having the reinforcing member 3 made of channel steel described in the first embodiment, but since a working space can be secured on the inner side of the corrugated steel plate 1, it is easier for workers working inside the excavation hole 301 to join the retaining panels 100A arranged vertically and horizontally.

Although not shown in the figure, the reinforcing member 3A may be a T-shaped steel instead of the angle steel.

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 vertical cross-sectional view showing the earth retaining panel 100B according to the third embodiment. Note that the same components as those of the earth retaining panel 100 described in the first embodiment and the earth retaining panel 100A described in the second embodiment are given the same reference numerals, and the description thereof will be omitted as appropriate.

As shown in FIG. 13, the retaining panel 100B according to the third embodiment includes a corrugated steel plate 11 in which the corrugated peaks 1a and valleys 1b extend along the longitudinal direction X, a pair of vertical flanges 2 provided at both ends of the corrugated steel plate 11 in the longitudinal direction X, and a reinforcing member 3 extending along the longitudinal direction X of the corrugated steel plate 11 and provided at the lower end of the corrugated steel plate 11.

The corrugated steel plate 11 of the retaining panel 100B according to the third embodiment is a so-called liner plate, in which the corrugated cross section is formed in a sine curve shape. The corrugated steel plate 11 has a thickness of, for example, about 2.7 mm to 7 mm. The corrugated steel plate 11 has horizontal flange portions 10 at both ends in the short direction Y, which are formed by bending both ends of the corrugation. The horizontal flange portions 10 have multiple connecting holes 10a formed along the longitudinal direction X to connect adjacent corrugated steel plates 11 stacked in the axial direction of the excavation hole 301.

The vertical flange portion 2 and the reinforcing member 3 have the same configuration as in the first and second embodiments. The reinforcing member 3 may be a channel steel or H-shaped steel as shown in the first embodiment, or an angle steel or T-shaped steel as shown in the second embodiment. Note that the reinforcing member 3 is shown to be arranged at the lower end of the corrugated steel plate 11, but is not limited to this, and may be arranged at the upper and lower ends of the corrugated steel plate 11.

When the retaining panels 100B according to the third embodiment are arranged vertically and connected, for example, as shown in FIG. 8, the outer surfaces of the webs 30 of the reinforcing members 3 are butted vertically to align the connection holes 10a and the joint holes 30a, the shafts of the bolts 5 are passed through the connection holes 10a and the joint holes 30a, and the shafts are fastened with nuts 6. As a result, the reinforcing members 3 of the vertically adjacent retaining panels 100B are joined and connected together with the horizontal flanges 10 of the corrugated steel plates 11 by the bolts 5 and nuts 6. Note that when the reinforcing members 3A described in the second embodiment are used, the means for connecting the vertically adjacent corrugated steel plates 11 may be, instead of the bolts 5 and nuts 6, a connector such as a clip.

When connecting adjacent earth retaining panels 100B 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 connection holes 2a, and the shaft portions of the bolts 7 are passed through the connection holes 2a, and the shaft portions are fastened with nuts 8. In other words, the earth retaining panels 100B according to the third embodiment can also be installed in the circumferential direction without bolting adjacent reinforcing members 3 to each other via joint plates 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. 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. Note that the means for connecting adjacent earth retaining panels 100B to each other on the left and right may be a connector such as a clip instead of the bolts 7 and nuts 8.

Embodiment 4.
Next, the earth retaining panel 100C according to the fourth embodiment will be described with reference to Fig. 14 and Fig. 15. Fig. 14 is a vertical cross-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 given the same reference numerals, and the description thereof will be omitted as appropriate.

As shown in FIG. 14, the retaining panel 100C according to the fourth embodiment includes a corrugated steel plate 12 in which the corrugated peaks 1a and valleys 1b extend along the longitudinal direction X, a pair of vertical flanges 2 provided at both ends of the corrugated steel plate 12 in the longitudinal direction X, and a reinforcing member 3 extending along the longitudinal direction X of the corrugated steel plate 12 and provided at the lower end of the corrugated steel plate 12.

The corrugated steel sheet 12 in the fourth embodiment is configured so that the corrugated cross section is angular corrugated. In this corrugated steel sheet 12, the horizontal flange portion 10 is not provided at the lower end in the short-side direction Y where the reinforcing member 3 is provided, as compared with the corrugated steel sheet 1 in the first embodiment. As described in the first embodiment, the vertically adjacent corrugated steel sheets 1 are connected by butting the horizontal flange portions 10 together and fastening the shaft portions of the bolts inserted into the connecting holes 10a with nuts. However, at the end in the short-side direction Y where the reinforcing member 3 is provided, the reinforcing member 3 also functions as the horizontal flange portion 10, so there is no need to provide the horizontal flange portion 10. However, in the corrugated steel sheet 12 in the fourth embodiment, it is desirable to weld the edge of the corrugation and the reinforcing member 3 to integrate them. Although it is not necessary to weld the edge of the corrugation in the short-side direction Y to the reinforcing member 3, welding can be performed to integrate them and improve the strength.

In addition, in the corrugated steel plate 12 in this embodiment 4, when reinforcing members 3 are provided at both ends in the short direction Y, horizontal flange portions 10 are not provided at those ends.

The retaining panel 100C according to the fourth embodiment is also connected to the already installed retaining panel 101 after being placed in the excavation hole 301 or in a deep portion of the excavation hole 301 where high earth pressure acts. When connecting the already installed upper retaining panel 101 to the retaining panel 100C according to the fourth embodiment, the horizontal flanges 10 are butted together vertically to align the connecting holes 10a, and the bolt shafts are passed through the connecting holes 10a and fastened with nuts.

Figure 15 is an explanatory diagram showing the state in which the retaining panels 100C according to the fourth embodiment are arranged and connected vertically. The upper retaining panel 100C has a configuration in which the reinforcing member 3 is provided only on the lower end of the corrugated steel plate 12. The upper retaining panel 100C does not have a horizontal flange portion 10 at the lower end in the short direction Y. On the other hand, the lower retaining panel 100C has a configuration in which the reinforcing member 3 is provided on the upper and lower ends of the corrugated steel plate 12. The lower retaining panel 100C does not have a horizontal flange portion 10 at both ends in the short direction Y. When the retaining panels 100C according to the fourth embodiment are arranged vertically and connected, as shown in Figure 15, the outer surfaces of the webs 30 of the reinforcing members 3 are butted up and down to align the joint holes 30a, and the shaft portions of the bolts 5 are passed through the joint holes 30a and fastened with nuts 6. As a result, vertically adjacent retaining panels 100C are connected by joining the reinforcing members 3 with bolts 5 and nuts 6.

When connecting the earth retaining panel 101 shown in FIG. 2 to the bottom of the earth retaining panel 100C according to the fourth embodiment arranged in the lower tier, the horizontal flange portion 10 of the corrugated steel plate 12 of the lower earth retaining panel 101 is butted against the outer surface of the web 30 of the reinforcing member 3 of the earth retaining panel 100C, and the connection hole 10a and the joint hole 30a are aligned. Then, a bolt is inserted through the joint hole 30a of the earth retaining panel 100C and the connection hole 10a of the earth retaining panel 101, and the shaft portion of the bolt is fastened with a nut.

When connecting adjacent earth retaining panels 100C 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 connection holes 2a, the shaft portions of the bolts 7 are passed through the connection holes 2a, and the shaft portions are fastened with nuts 8. In other words, the earth retaining panels 100C according to the fourth embodiment can also be installed in the circumferential direction 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, without bolting the adjacent reinforcing members 3 to each other. 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. Note that the means for connecting the earth retaining panels 100C adjacent to each other on the left and right may be a connector such as a clip instead of the bolts 7 and nuts 8.

As described above, the retaining panel 100C according to the fourth embodiment is configured to omit the horizontal flange portion 10 at least at one end of the corrugated steel plate 12 in the short direction Y, which can reduce the manufacturing effort and material costs, resulting in a reduction in manufacturing costs. Furthermore, even if bending is required for application to a circular shaft, for example, the retaining panel 100C can be easily bent because it does not have the horizontal flange portion 10. Furthermore, the retaining panel 100C can be made lighter by the amount of the horizontal flange portion 10 omitted, which reduces the burden of carrying it and improves workability during construction.

The earth retaining panel 100C according to the fourth embodiment has been described as having a configuration with a reinforcing member 3 made of channel steel as described in the first embodiment, but this is not limited to this. The earth retaining panel 100C may be the reinforcing member 3 made of H-shaped steel shown in FIG. 10, the reinforcing member 3A made of angle steel as described in the second embodiment, or the reinforcing member made of T-shaped steel. When the reinforcing member 3A described in the second embodiment is used, the means for connecting the vertically adjacent corrugated steel plates 12 may be, for example, a connector such as a clip instead of the bolt 5 and nut 8. In addition, the earth retaining panel 100C according to the fourth embodiment is not limited to a configuration with a corrugated steel plate 12 whose corrugated cross section is formed in a square wave shape, and may be a configuration with a corrugated steel plate 11 whose corrugated cross section is formed in a sine curve shape as described in the third embodiment.

Although the earth retaining panels (100, 100A, 100B, 100C) and the earth retaining structure 200 have been described above based on the embodiments, they are not limited to the configurations of the above-mentioned embodiments. For example, the configurations of the earth retaining panels (100, 100A, 100B, 100C) described above are only examples and may include other components. In addition, the construction method of the earth retaining structure 200 described based on FIG. 4 is only an example and is not limited to the above-mentioned embodiments. In short, the earth retaining panels (100, 100A, 100B, 100C) and the earth retaining structure 200 include the range of design changes and application variations that are normally made by a person skilled in the art, within the scope of their technical concept.

1 Corrugated steel plate, 1a Peak, 1b Valley, 1c Web, 2 Vertical flange, 2a Connection hole, 3, 3A Reinforcement member, 30 Web, 30a Connection hole, 31 Flange, 32 Bottom, 33 Side, 4 Corner member, 5 Bolt, 6 Nut, 7 Bolt, 8 Nut, 10 Horizontal flange, 10a Connection hole, 11 Corrugated steel plate, 12 Corrugated steel plate, 100, 100A, 100B, 100C, 101, 102 Earth retaining panel, 200 Earth retaining structure, 201 Structure, 300 Ground, 301 Excavation hole, 400 Cross, X Longitudinal direction, Y Shortitudinal direction, S Gap.

Claims (10)

An earth retaining panel used to construct an earth retaining structure by being installed in a borehole formed by excavating the ground,
A corrugated steel plate having corrugated peaks and valleys extending along a longitudinal direction;
A pair of vertical flange portions provided at both ends of the corrugated steel plate in the longitudinal direction;
A reinforcing member extending along the longitudinal direction of the corrugated steel plate and provided at least one end of both ends in the lateral direction of the corrugated steel plate,
The reinforcing member is disposed between the pair of vertical flange portions, and both ends in a longitudinal direction are joined to 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 side direction,
The reinforcing member is provided along the horizontal flange portion of the retaining panel. The earth retaining panel according to claim 1, wherein the reinforcing member is an angle iron, and the inner surface of the bend is arranged to face the upper end or the lower end of the corrugated steel plate. An earth retaining panel used to construct an earth retaining structure by being installed in a borehole formed by excavating the ground,
A corrugated steel plate having corrugated peaks and valleys extending along a longitudinal direction;
A pair of vertical flange portions provided at both ends of the corrugated steel plate in the longitudinal direction;
A reinforcing member extending along the longitudinal direction of the corrugated steel plate and provided at least one end of both ends in the lateral direction of the corrugated steel plate,
The reinforcing member is disposed between the pair of vertical flange portions, and both ends in a longitudinal direction are joined to inner surfaces of the vertical flange portions,
The reinforcing member is a channel steel, and the inner bottom surface of the groove is arranged facing the upper end or lower end of the corrugated steel plate. The retaining panel according to claim 3 , wherein the corrugated steel plate has a horizontal flange portion at least at one of both ends in the short side direction. The retaining panel according to any one of claims 1 to 4 , wherein the corrugated steel sheet has a corrugated cross section formed into a square wave shape. The retaining panel according to any one of claims 1 to 4 , wherein the corrugated steel plate has a corrugated cross section formed in a sine curve shape. An earth retaining panel used to construct an earth retaining structure by being installed in a borehole formed by excavating the ground,
A corrugated steel plate having corrugated peaks and valleys extending along a longitudinal direction;
A pair of vertical flange portions provided at both ends of the corrugated steel plate in the longitudinal direction;
A reinforcing member extending along the longitudinal direction of the corrugated steel plate and provided at least one end of both ends in the lateral direction of the corrugated steel plate,
The reinforcing member is disposed between the pair of vertical flange portions, and both ends in a longitudinal direction are joined to inner surfaces of the vertical flange portions,
The corrugated steel sheet has a corrugated cross section formed into a square wave shape or a sine curve shape,
The corrugated steel plate has a horizontal flange portion at at least one end of both ends in the short side direction,
A plurality of connecting holes are formed along the longitudinal direction of the horizontal flange portion of the corrugated steel plate,
A retaining panel in which the reinforcing member has a connection hole formed at a position corresponding to the connecting hole. An earth retaining structure comprising a structure in which a plurality of earth retaining panels according to any one of claims 1 to 7 are arranged along the wall surface of the excavation hole and the earth retaining panels are connected together to assemble the structure. The retaining structure according to claim 8, wherein adjacent retaining panels in the circumferential direction of the borehole are connected by joining adjacent vertical flange portions. The retaining structure according to claim 8 or 9, wherein the retaining panels adjacent to each other in the axial direction of the borehole are joined by butting the adjacent reinforcing members together, or the adjacent reinforcing members and the short-side ends of the corrugated steel plate together.

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