JP7706342B2 - Earth retaining panel - Google Patents

Description

The present invention relates to an earth retaining panel with improved cross-sectional rigidity.

As disclosed in Patent Document 1, for example, there is a known earth retaining structure constructed by assembling earth retaining panels having corrugated steel plates in a borehole formed by excavating the ground. The earth retaining structure is constructed by stacking structures formed by arranging multiple earth retaining panels 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.

JP 2020-066845 A

However, the construction of the reinforcing rings is complicated and time-consuming, which lengthens the construction period and increases the construction costs. For this reason, there is a demand for an earth-retaining panel for constructing earth-retaining structures that does not require the installation of reinforcing rings.

The present invention aims to solve the above problems and provide an earth retaining panel that can be used in excavated holes or deep parts of excavated holes where high earth pressure acts by improving cross-sectional rigidity.

The 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 plurality of corrugated steel plates formed so that the corrugated peaks and valleys extend along the longitudinal direction, and vertical flange portions provided at both longitudinal ends of at least one of the corrugated steel plates, the plurality of corrugated steel plates being joined in a combined state in which the peaks and valleys of adjacent corrugated steel plates face each other, and each of the vertical flange portions is constructed of a single steel plate for the plurality of corrugated steel plates .

The earth retaining panel of the present invention comprises multiple corrugated steel plates and vertical flanges, and the peaks and valleys of adjacent corrugated steel plates are joined together facing each other to improve cross-sectional rigidity, so that it can be used in excavated holes where high earth pressure acts or in deep excavated holes.

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 modified example 1 of the soil retaining panel of embodiment 1. A vertical cross-sectional view showing modified example 2 of the retaining panel of embodiment 1. This is an explanatory diagram showing an enlarged view of a key part of an earth retaining structure constructed using the earth retaining panel of embodiment 1. A vertical cross-sectional view showing an earth retaining panel according to embodiment 2. A vertical cross-sectional view showing an earth retaining panel according to embodiment 3.

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 a plate 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 301. 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. 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. The number of connecting holes 2a shown in the figure is an example and is not limited thereto. As shown in FIG. 1, the rectangular corners of the structure 201 are provided with corner retaining panels 102 processed into an L-shape via corner members 6. 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 bars called reinforcing rings are sandwiched between adjacent structures 201 on the top and bottom to increase rigidity. However, the construction of reinforcing rings is cumbersome and time-consuming, which lengthens the construction period and increases the cost of construction. For example, when multiple H-shaped steel bars are placed around the circumferential direction of the borehole 301 and adjacent H-shaped steel bars on the left and right are connected with flange joints, there are connection points that are out of sight of the worker. Therefore, with this assembly method, the work is done in conditions that are difficult to see, making assembly difficult and raising concerns about safety confirmation.

The earth-retaining panel 100 according to the first embodiment has improved cross-sectional rigidity so that it can be used in excavated holes or deep portions of excavated holes where high earth pressure acts. 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 a first modified example of the earth-retaining panel 100 according to the first embodiment. Figure 8 is a vertical cross-sectional view of a second modified example 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 two corrugated steel plates 1, 1 in which the corrugated peaks 1a and valleys 1b extend along the longitudinal direction X, and vertical flanges 2, 2 provided at both the left and right ends of the corrugated steel plate 1 in the longitudinal direction X.

The corrugated steel plate 1 has the same structure as the corrugated steel plate 1 of the earth retaining panel 101 described above. That is, the corrugated steel plate 1 has a structure in which the corrugated cross section is formed in a square wave shape. The corrugated steel plate 1 has a thickness of, for example, about 2.7 mm to 7 mm. 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 two corrugated steel plates 1, 1 are arranged in a stacked manner in the Z direction, and are joined in a combined state in which the peak portions 1a and the valley portions 1b of the corrugated steel plates 1 face each other. The opposing peak portions 1a are in surface contact with each other. The peak portions 1a of the corrugated steel plate 1 have a plurality of joining holes (not shown) for attaching the joining members 3 formed at intervals along the longitudinal direction X. In addition, the two corrugated steel plates 1, 1 are combined in a manner that the leading edges of the horizontal flange portions 10 face each other outward. This takes into consideration the connection work of the top, bottom, left and right retaining panels 100 and 101.

The two corrugated steel sheets 1, 1 are joined by a joining member 3 at their peaks 1a which come into surface contact. The two corrugated steel sheets 1, 1 have the same corrugated cross-sectional shape. This allows the two corrugated steel sheets 1, 1 to be arranged facing in opposite directions in the thickness direction (Z direction) and joined by butting the flat parts of the corrugations. The two corrugated steel sheets 1, 1 have flat peaks 1a and valleys 1b in cross-sectional shape, so they are easy to join together when stacked in the thickness direction (Z direction), and the large contact area has the advantage of making it easy to transfer loads between them.

The joining members 3 are, for example, bolts and nuts. The two corrugated steel plates 1, 1 are joined by fastening the shaft of a bolt inserted into a joining hole with a nut. A plurality of joining members 3 are provided at intervals along the longitudinal direction X on each ridge 1a that makes surface contact. Note that the joining members 3 do not necessarily have to be provided on each ridge 1a, and may be provided only on some of the ridges 1a. In other words, the positions and number of the joining members 3 are not limited to the configuration shown in the figure, and may be changed as appropriate depending on the size and shape of the corrugated steel plates 1, 1.

The two corrugated steel sheets 1, 1 are joined at both ends in the short direction Y by welding 4. Specifically, a recessed portion 10b is formed at the top and bottom of the two combined corrugated steel sheets 1, 1. The two corrugated steel sheets 1, 1 are joined by welding 4 at the recessed portion 10b. Note that the opposing corrugated steel sheets 1, 1 may be configured such that only one of the ends in the short direction Y is joined by welding 4.

In order to improve the cross-sectional rigidity, it is preferable that the opposing corrugated steel plates 1, 1 are joined by a joining member 3 and also by welding 4, but they may be joined by only one of the joining member 3 and the welding 4. Furthermore, the joining member 3 and the welding 4 may be omitted, and the opposing corrugated steel plates 1, 1 may be joined via the vertical flange portion 2.

The vertical flange portion 2 has the same configuration as the vertical flange portion 2 of the earth retaining panel 101 described above. The vertical flange portion 2 is composed of one steel plate for the two corrugated steel plates 1, 1, and is welded to both ends of the two corrugated steel plates 1, 1 in the longitudinal direction X. The vertical flange portion 2 may be composed of one sheet as shown in FIG. 5, or may be provided on each corrugated steel plate 1 as shown in FIG. 7. When the vertical flange portion 2 is provided on each corrugated steel plate 1, the opposing end faces of the vertical flange portion 2 may be joined by welding or the like. Although not shown in the figure, the vertical flange portion 2 may be provided only on the corrugated steel plate 1 located on the excavation side of the two corrugated steel plates 1, 1. This is because, in order to connect the earth retaining panels 100 adjacent to each other in the circumferential direction, it is necessary to provide the vertical flange portion 2 on the corrugated steel plate 1 located on the excavation side.

The retaining panel 100 is not limited to the configuration of two corrugated steel plates 1, 1 joined together as shown in the figure. As shown in FIG. 8, the retaining panel 100 may have three or more corrugated steel plates 1, and may be joined together in a combined state with the peaks 1a and valleys 1b of adjacent corrugated steel plates 1 facing each other. This can further increase the rigidity of the retaining panel 100.

In addition, the retaining panel has been shown to be linear in plan view (from the Y direction), but it may be arc-shaped, for example, depending on the shape of the excavation hole.

9 is an explanatory diagram showing an enlarged view of a main part of an earth retaining structure constructed using the earth retaining panel 100 according to the first embodiment. As shown in FIG. 9, the earth retaining panel 100 according to the first embodiment is placed in the excavation hole 301 or in a deep part of the excavation hole 301 where high earth pressure acts, and then connected to the already installed earth retaining panel 101 using a connecting member 5. The connecting member 5 is, for example, a bolt and a nut. In the earth retaining panel 100 according to the first embodiment, the corrugated steel plate 1 located on the excavation side of the two corrugated steel plates 1, 1 is connected to the corrugated steel plate 1 of the upper earth retaining panel 101. The vertically adjacent corrugated steel plates 1 are connected by butting the horizontal flange portions 10 of each other vertically, aligning the positions of the connecting holes 10a, passing the shanks of the bolts through the connecting holes 10a of each other, and fastening the shanks with nuts. Of the two corrugated steel plates 1, 1 of the retaining panel 100 according to this embodiment 1, the corrugated steel plate 1 located on the natural ground side is not connected to the corrugated steel plate 1 of the upper retaining panel 101. This is because it is easier for workers working inside the excavation hole to work if the corrugated steel plate 1 located on the excavation side is connected to the corrugated steel plate 1 of the upper retaining panel 101.

When connecting an earth retaining panel 101 to the lower level of the earth retaining panel 100 according to the first embodiment, the corrugated steel plate 1 located on the excavation side is connected to the corrugated steel plate 1 of the lower level earth retaining panel 101. Even when the earth retaining panels 100 according to the first embodiment are arranged in two or more levels in succession, only the corrugated steel plates 1 located on the excavation side are connected to each other. However, the corrugated steel plates 1, 1 located on the natural ground side may be connected to each other. Moreover, the means for connecting the corrugated steel plates 1 adjacent to each other vertically may be, instead of bolts and nuts, a connector such as a clip.

In addition, between adjacent earth retaining panels 100 in the circumferential direction, only the corrugated steel plate 1 located on the excavation side is connected, and the corrugated steel plate 1 located on the ground side is not connected. Adjacent corrugated steel plates 1 on the left and right are connected by butting the vertical flange portions 2 together, aligning the connection holes 2a, passing the shanks of bolts through each other's connection holes 2a, and fastening the shanks with nuts. Note that the means for connecting adjacent earth retaining panels 100 on the left and right may be connectors such as clips instead of bolts and nuts.

As described above, the retaining panel 100 according to the first embodiment includes a plurality of corrugated steel plates 1 in which the corrugated peaks 1a and valleys 1b extend along the longitudinal direction X, and vertical flanges 2 provided at both ends in the longitudinal direction X of at least one of the corrugated steel plates 1. The corrugated steel plates 1 are joined together in such a manner that the peaks 1a and valleys 1b of adjacent corrugated steel plates 1 face each other.

In other words, the retaining panel 100 according to the first embodiment is rigidly integrated by joining the peaks 1a and valleys 1b of adjacent corrugated steel plates 1 facing each other in the thickness direction of the corrugated steel plate 1, thereby improving the cross-sectional rigidity and allowing it to be used in excavated holes or deep excavated holes where high earth pressure acts. Therefore, by using the retaining panel 100 according to the first embodiment, the installation of a reinforcing ring can be omitted. However, a reinforcing ring may be installed in the retaining panel 100 according to the first embodiment to further increase rigidity.

Adjacent corrugated steel plates 1, 1 are joined via vertical flange portions 2. Adjacent corrugated steel plates 1, 1 are joined at their peak portions 1a or valley portions 1b by joining members 3. Adjacent corrugated steel plates 1, 1 are joined at both ends in the short direction Y by welding 4. With these configurations, the retaining panel 100 according to this embodiment 1 can be rigidly integrated.

Embodiment 2.
Next, the earth retaining panel 100A according to the second embodiment will be described with reference to Fig. 10. Fig. 10 is a vertical cross-sectional view showing the earth retaining panel 100A according to the second embodiment. Note that the same components as those in the earth retaining panel 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. 10, the retaining panel 100A according to the second embodiment is composed of two corrugated steel plates, a first corrugated steel plate 1A and a second corrugated steel plate 1B. The first corrugated steel plate 1A has the same configuration as the corrugated steel plate 1 described in the first embodiment. That is, the first corrugated steel plate 1A has a corrugated cross section formed in a square wave shape, and has horizontal flange portions 10 at both ends in the short direction Y. The second corrugated steel plate 1B has a corrugated cross section formed in a square wave shape, and does not have horizontal flange portions 10 at both ends in the short direction Y.

As described with reference to FIG. 9 above, the corrugated steel plate 1 located on the ground side is not joined to the corrugated steel plate 1 of the upper retaining panel 101 and the corrugated steel plate 1 of the lower retaining panel 101. Therefore, the horizontal flange portion 10 of the corrugated steel plate 1 located on the ground side is a wasted portion in terms of the structure. Therefore, in the retaining panel 100A according to the second embodiment, the corrugated steel plate located on the ground side is the second corrugated steel plate 1B that does not have the horizontal flange portion 10. Therefore, the retaining panel 100A according to the second embodiment can omit the processing of the horizontal flange portion 10 of the second corrugated steel plate 1B and can reduce the cost of materials, thereby reducing the manufacturing cost while increasing the rigidity cross-section.

In the retaining panel 100A according to the second embodiment, the vertical flange portion 2 may be formed of a single sheet, or may be provided on both the first corrugated steel plate 1A and the second corrugated steel plate 1B. When the vertical flange portion 2 is provided on both the first corrugated steel plate 1A and the second corrugated steel plate 1B, the opposing end faces of the vertical flange portion 2 may be joined by welding or the like. Although not shown in the figure, the vertical flange portion 2 may be provided only on the first corrugated steel plate 1A located on the excavation side.

In addition, the earth-retaining panel 100A according to the second embodiment is not limited to a configuration in which two corrugated steel plates, the first corrugated steel plate 1A and the second corrugated steel plate 1B, are combined and joined. The earth-retaining panel 100A may also be configured to have a total of three or more sheets, including the first corrugated steel plate 1A and the second corrugated steel plate 1B. This can further increase the rigidity of the earth-retaining panel 100.

The retaining panel 100A according to the second embodiment has a linear configuration when viewed from above (from the Y direction), but it may be, for example, arc-shaped depending on the shape of the excavation hole.

Embodiment 3.
Next, the earth retaining panel 100B according to the third embodiment will be described with reference to Fig. 11. Fig. 11 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. 11, the retaining panel 100B according to the third embodiment also includes two corrugated steel plates 1C in which the crests 1a and valleys 1b of the corrugations are formed to extend along the longitudinal direction X, and vertical flanges 2 provided at both ends of the corrugated steel plates 1C in the longitudinal direction X. The two corrugated steel plates 1C are so-called liner plates in which the corrugated cross section is formed in a sine curve shape. The corrugated steel plate 1C has a thickness of, for example, about 2.7 mm to 7 mm. The corrugated steel plate 1C has horizontal flanges 10 formed by bending both ends of the corrugation at both ends in the short direction Y. The horizontal flanges 10 are formed by bending both ends of the corrugation of the corrugated steel plate 1C. The two corrugated steel plates 1C, 1C are joined in a combined state in which the crests 1a and valleys 1b of the corrugated steel plates 1C face each other. The structure for joining the two corrugated steel plates 1C, 1C is the same as in the above-mentioned embodiments 1 and 2. The opposing peaks 1a are in surface contact with each other. The two corrugated steel plates 1C, 1C are assembled facing each other so that the leading edges of the horizontal flanges 10 face outward.

In the retaining panel 100B according to the third embodiment, the vertical flange portion 2 may be formed of a single sheet, or may be provided on each of the corrugated steel plates 1C. When the vertical flange portions 2 are provided on each of the corrugated steel plates 1C, the opposing end faces of the vertical flange portions 2 may be joined by welding or the like. Although not shown in the figure, the vertical flange portion 2 may be provided only on the corrugated steel plate 1C located on the excavation side.

In addition, the earth retaining panel 100B according to the third embodiment is not limited to a configuration in which two corrugated steel plates 1C are joined together. The earth retaining panel 100B may also be configured to have three or more corrugated steel plates 1C. This can further increase the rigidity of the earth retaining panel 100B.

The retaining panel 100B according to the third embodiment has a linear configuration when viewed from above (from the Y direction), but it may be, for example, arc-shaped depending on the shape of the excavation hole.

As described above, the retaining panel 100B according to the third embodiment can improve the cross-sectional rigidity by using the corrugated steel plate 1C made of a liner plate, and can be used in excavated holes where high earth pressure acts or in deep excavated holes.

Although the earth retaining panels (100, 100A, 100B) 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) described above are only examples and may include other components. Furthermore, 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) 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, 1C corrugated steel plate, 1A first corrugated steel plate, 1B second corrugated steel plate, 1a crest, 1b valley, 1c web, 2 vertical flange, 2a connection hole, 3 joint member, 4 weld, 5 joint member, 6 corner member, 10 horizontal flange, 10a connection hole, 10b recessed portion, 100, 100A, 100B, 101, 102 retaining panel, 200 retaining structure, 201 structure, 300 ground, 301 excavation hole, 400 lattice, X longitudinal direction, Y transverse direction.

Claims (7)

An earth retaining panel used to construct an earth retaining structure by being installed in a borehole formed by excavating the ground,
A plurality of corrugated steel plates formed so that corrugated peaks and valleys extend along the longitudinal direction;
At least one of the corrugated steel plates has a longitudinal flange portion provided at both ends in the longitudinal direction thereof,
The corrugated steel plates are joined in a combined state in which the peak portions and the valley portions of adjacent corrugated steel plates face each other ,
A retaining panel , wherein each of the vertical flange portions is composed of a single steel plate for each of the plurality of corrugated steel plates . An earth retaining panel used to construct an earth retaining structure by being installed in a borehole formed by excavating the ground,
A plurality of corrugated steel plates formed so that corrugated peaks and valleys extend along the longitudinal direction;
At least one of the corrugated steel plates has a longitudinal flange portion provided at both ends in the longitudinal direction thereof,
The corrugated steel plates are joined in a combined state in which the peak portions and the valley portions of adjacent corrugated steel plates face each other,
The corrugated steel sheets each include a first corrugated steel sheet having a corrugated cross section formed in a square wave shape and having horizontal flange portions at both ends in the short direction, and a second corrugated steel sheet having a corrugated cross section formed in a square wave shape and having no horizontal flange portions at both ends in the short direction.
The first corrugated steel plate and the second corrugated steel plate are joined together in a combined state with the peak portions facing each other and the valley portions facing each other, forming an earth-retaining panel. The retaining panel according to claim 1 or 2 , wherein adjacent corrugated steel plates are joined via the vertical flange portions. The retaining panel according to any one of claims 1 to 3 , wherein adjacent corrugated steel plates are joined at their peaks or valleys by a joining member. The retaining panel according to any one of claims 1 to 4 , wherein adjacent corrugated steel plates are joined at both ends in the short side direction by welding. The retaining panel according to any one of claims 1 to 5 , wherein the corrugated steel plate has a corrugated cross section formed in a square wave shape and has horizontal flange portions at both ends in the short direction. The retaining panel according to any one of claims 1 to 5 , wherein the corrugated steel plate has a corrugated cross section formed in a sine curve shape.

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