Soil retention panel

Abstract

To provide an earth retaining panel that can be used for a drilling hole highly affected by an earth pressure or a deep portion of the drilling hole by improving cross-sectional stiffness.SOLUTION: An earth retaining panel has a plurality of corrugated steel plates formed so that wave-shaped crest parts and trough parts extend along a longitudinal direction, and a vertical flange portion provided at both ends in the longitudnal direction of at least one corrugated steel plate. The plurality of corrugated steel plates is connected in a state where the crest parts and the trough parts of adjacent corrugated steel plate are combined so as to face each other.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a retaining panel with improved cross-sectional rigidity.

Background Art

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

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

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the construction of the reinforcing ring is complicated and time-consuming, so there is a problem that the construction period is prolonged and the construction cost increases. Therefore, a retaining panel for constructing a retaining structure that can omit the installation of the reinforcing ring is desired.

[0006] The present invention solves the above problems, and an object thereof is to provide an earth retaining panel that can be used in an excavation hole where the earth pressure acts highly or in a deep part of the excavation hole by improving the cross-sectional rigidity.

Means for Solving the Problems

[0007] The earth retaining panel according to the present invention is an earth retaining panel used for constructing an earth retaining structure by being installed in an excavation hole formed by excavating the ground, and includes a plurality of corrugated steel plates formed such that the peak portions and the valley portions of the corrugations 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 are joined in a state where the peak portions and the valley portions of adjacent corrugated steel plates face each other and are combined. and each of the vertical flange portions is composed of a single steel plate with respect to the plurality of corrugated steel plates It is as described above.

Effects of the Invention

[0008] The earth retaining panel according to the present invention includes a plurality of corrugated steel plates and vertical flange portions, and is joined in a state where the peak portions and the valley portions of adjacent corrugated steel plates face each other and are combined, thereby improving the cross-sectional rigidity. Therefore, it can be used in an excavation hole where the earth pressure acts highly or in a deep part of the excavation hole.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each figure, the same or corresponding parts are denoted by the same reference numerals, and the description thereof will be omitted or simplified as appropriate. Also, regarding the configurations shown in each figure, the shape, size, arrangement, etc. can be appropriately changed within the scope of the present invention. Further, in the present embodiment, terms indicating directions (for example, up, down, left, right, vertical, horizontal, etc.) are appropriately used for easy understanding, but these notations are for convenience of explanation and do not limit the arrangement, direction, and orientation of devices, instruments, or parts, etc.

[0011] Embodiment 1. First, an example of the earth retaining structure 200 will be described with reference to FIGS. 1 to 4. FIG. 1 is a perspective view schematically showing an example of the earth retaining structure 200. FIG. 2 is a perspective view showing an example of the earth retaining panel 101 constituting the earth retaining structure 200. FIG. 3 is a longitudinal sectional view showing an example of the earth retaining panel 101 constituting the earth retaining structure 200. The earth retaining structure 200 is constructed, for example, when constructing a vertical shaft for constructing the foundation of a building structure or a civil engineering structure such as a sump well constructed underground. The earth retaining structure 200 is constructed by stacking a plurality of annular structures 201 as shown in FIG. 1 in multiple stages along the axial direction of the excavation hole in a vertical excavation hole formed by excavating the ground.

[0012] Each structure 201 that constitutes the earth retaining structure 200 has a configuration formed by annularly arranging a plurality of earth retaining panels 101 having the same section modulus. As shown in FIGS. 2 and 3, the earth retaining panel 101 includes a single corrugated steel plate 1 formed such that the corrugated ridges 1a and valleys 1b extend along the longitudinal direction X, and longitudinal flange portions 2 provided at both ends in the longitudinal direction X of the corrugated steel plate 1.

[0013] The corrugated steel plate 1 has a configuration in which a rolled steel plate is bent into a square wave shape such that the corrugated cross section is square wave-shaped. The square wave shape in the present embodiment is, for example, a trapezoidal wave shape with rounded corners. The corrugated steel plate 1 is composed of, for example, three ridges 1a and two valleys 1b. However, the number of ridges 1a and valleys 1b is not limited to the illustrated number. The ridges 1a and valleys 1b are formed to be substantially parallel. The corrugated steel plate 1 is formed by slightly inclining the web 1c connecting the ridges 1a and valleys 1b with respect to the horizontal direction so that the bottom of the valley 1b becomes narrower. By slightly inclining the web 1c, it becomes easier to release the mold when performing plastic working for corrugation, and manufacturing becomes easier. Further, the corrugated steel plate 1 increases the width between the ridges 1a and valleys 1b by reducing the inclination angle of the web 1c connecting the ridges 1a and valleys 1b, and the rigidity when a bending moment is applied in the plane direction becomes higher. This is because the section modulus at the neutral axis of bending of the corrugated steel plate 1 increases as the widths of the ridges 1a and valleys 1b become wider. The inclination angle of the web 1c of the corrugated steel plate 1 with respect to the horizontal direction is set to be 0° or more and 20° or less, and more preferably 0° or more and 3° or less.

[0014] The corrugated steel plate 1 has a thickness of about 2.7 mm to 7 mm, for example. The plate thicknesses of the ridges 1a and valleys 1b are the same as the plate thickness of the web 1c, but may be made thicker than the web 1c. With such a configuration, the cross-sectional areas of the ridges 1a and valleys 1b far from the neutral axis become larger, and the section modulus of the corrugated steel plate 1 can be further increased.

[0015] As shown in FIGS. 2 and 3, the corrugated steel plate 1 has transverse flange portions 10 formed by bending both end edges of the corrugation at both ends in the short side direction Y. The transverse flange portion 10 is a flat plate-like portion formed substantially perpendicular to the hole axis direction. A plurality of connecting holes 10a for connecting adjacent corrugated steel plates stacked vertically in the hole axis direction of the excavation hole are formed along the longitudinal direction X in the transverse flange portion 10. The adjacent corrugated steel plates 1 above and below are connected by butting the transverse flange portions 10 and fastening the shaft portion of the bolt inserted through the connecting hole 10a with a nut. Note that, as a means for connecting the transverse flange portions 10 of the adjacent corrugated steel plates 1 above and below, a connector such as a clip may be used. Also, the number of the illustrated connecting holes 10a is an example and is not limited thereto.

[0016] The longitudinal flange portion 2 is configured to be provided by welding plates to both end edges in the longitudinal direction X of the corrugated steel plate 1. The thickness of the longitudinal flange portion 2 is determined according to the strength and rigidity required for the earth retaining structure 200. A plurality of connecting holes 2a for connecting adjacent earth retaining panels 101 arranged in the circumferential direction of the excavation hole 301 are formed along the vertical direction (Y direction) in the longitudinal flange portion 2. The adjacent earth retaining panels 101 on the left and right are connected by butting the longitudinal flange portions 2 and fastening the shaft portion of the bolt inserted through the connecting hole 2a with a nut. Note that, as a means for connecting the longitudinal flange portions 2 of the adjacent earth retaining panels 101 on the left and right, a connector such as a clip may be used. Also, the number of the illustrated connecting holes 2a is an example and is not limited thereto. As shown in FIG. 1, at the rectangular corners of the structure 201, earth retaining panels 102 for corner portions processed into an L shape are arranged via corner members 6. The corrugated steel plate 1 and the longitudinal flange portion 2 constituting the earth retaining panel 102 have the same configuration as described above.

[0017] Note that the cross-sectional shape of the earth retaining panel 101 shown in FIGS. 1 to 3 is an example, and it may be configured to be formed in a sine curve shape, for example, or may have other shapes.

[0018] Next, an example of the construction method of the earth retaining structure 200 will be described with reference to FIG. 4. FIG. 4 is an explanatory diagram schematically showing an example of the construction method of the earth retaining structure 200. First, as shown in FIG. 4(A), an excavation hole 301 for constructing the earth retaining structure 200 is formed on the ground 300. The excavation hole 301 is formed with an outer diameter that is, for example, about 20 cm larger than the outer diameter of the earth retaining structure 200. The depth of the excavation hole 301 is about 0.5 m to 1.5 m as an example. Then, the earth retaining panels 101 are arranged annularly along the wall surface of the excavation hole 301 to assemble the structure 201. The earth retaining panels 101 are arranged such that the mountain portion 1a faces the natural ground side and the valley portion 1b faces the excavation side. Note that the natural ground side is the outer surface side of the earth retaining panel 101, and the excavation side is the inner surface side of the earth retaining panel 101.

[0019] The structure 201 is assembled by sequentially arranging the earth retaining panels 101 along the circumferential direction of the wall surface of the excavation hole 301 and connecting the adjacent earth retaining panels 101 on the left and right with bolts and nuts. The earth retaining panel 101 of the upper structure 201 and the earth retaining panel 101 of the lower structure 201 are connected with bolts and nuts. Note that the upper earth retaining panel 101 and the lower earth retaining panel 101 are arranged with their circumferential positions shifted so as to be staggeredly arranged. Thereby, the earth retaining structure 200 can suppress variations in strength and rigidity at each position in the circumferential direction. However, if the vertical flange portion 2 of the earth retaining panel 101 has sufficient thickness, the earth retaining panels 101 may be continuously installed in the hole axis direction without being staggeredly arranged. In this way, a plurality of structures 201 are stacked along the hole axis direction (in the case of the illustrated example, three stages), and a part of the earth retaining structure 200 is constructed.

[0020] Next, as shown in FIG. 4(B), after fixing the structure 201 located at the uppermost stage to the ground 300 with the well girder 400, the excavation hole 301 outside the structure 201 is backfilled with the excavated soil. Note that the means for fixing the structure 201 located at the uppermost stage to the ground 300 is not limited to the well girder 400, and for example, concrete may be used.

[0021] Then, as shown in Fig. 4(C), while excavating the ground, the structure 201 is assembled and excavation proceeds to a predetermined depth. After fixing the structure 201 located at the uppermost stage with the shaft girder 400, a soil retaining panel 101 is arranged along the circumferential direction of the wall surface of the excavation hole 301 at the lower end of the upper structure 201, and is connected to the upper soil retaining panel 101 with bolts and nuts. Also, the adjacent soil retaining panels 101 on the left and right are connected with bolts and nuts to construct the lower structure 201. Note that concrete or mortar is filled as a backfill injection material between the soil retaining panel 101 and the excavation hole 301.

[0022] In this way, the soil retaining structure 200 is constructed by stacking a plurality of annular structures 201 as shown in Fig. 1 in multiple stages along the hole axis direction of the vertical excavation hole 301 formed by excavating the ground 300. Note that the soil retaining structure 200 is not limited to the rectangular shape shown in Fig. 1, and may be, for example, circular, oval like a oval coin, or U-shaped like a horseshoe shape in plan view. The corrugated steel sheet 1 is configured in a shape corresponding to the shape of the soil retaining structure 200.

[0023] By the way, in the soil retaining structure 200, as the depth of the excavation hole 301 increases, the earth pressure from the ground side increases, and there may be a case where the rigidity is insufficient. Also, regardless of the depth, depending on the soil conditions etc., the earth pressure may be large. Further, as the depth in the hole axis direction increases, the self-weight of the structure 201 arranged above acts on the structure 201 arranged below.

[0024] For this reason, in a conventional soil retaining structure, at a deep location, an H-shaped steel called a reinforcing ring is sandwiched between the structures 201 adjacent to each other vertically to increase the rigidity. However, the construction of the reinforcing ring is complicated and time-consuming, so there is a problem that the construction period is prolonged and the construction cost increases. For example, when arranging a plurality of H-shaped steels along the circumferential direction of the excavation hole 301 and connecting the adjacent H-shaped steels on the left and right with flange joints, there are connection locations that are not visible to the operator. Therefore, this assembly work method becomes work in a state where visual inspection is difficult, and in addition to being difficult to assemble, there are concerns about safety confirmation.

[0025] Therefore, the earth retaining panel 100 according to the first embodiment is improved in cross-sectional rigidity so that it can be used in an excavation hole where high earth pressure acts or in a portion where the depth of the excavation hole is deep. FIG. 5 is a perspective view showing the earth retaining panel 100 according to the first embodiment. FIG. 6 is a longitudinal sectional view showing the earth retaining panel 100 according to the first embodiment. FIG. 7 is a perspective view showing a first modification of the earth retaining panel 100 according to the first embodiment. FIG. 8 is a longitudinal sectional view showing a second modification of the earth retaining panel 100 according to the first embodiment.

[0026] As shown in FIGS. 5 and 6, the earth retaining panel 100 according to the first embodiment includes two corrugated steel plates 1, 1 formed such that the peak portions 1a and valley portions 1b of the corrugations extend along the longitudinal direction X, and vertical flange portions 2, 2 provided at both left and right end portions in the longitudinal direction X of the corrugated steel plate 1.

[0027] The corrugated steel plate 1 has the same configuration as the corrugated steel plate 1 of the earth retaining panel 101 described above. That is, the corrugated steel plate 1 has a configuration 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 FIGS. 5 and 6, the corrugated steel plate 1 has lateral flange portions 10 formed by bending both end edges of the corrugations at both end portions in the short direction Y. The two corrugated steel plates 1, 1 are arranged overlapping each other in the Z direction and are joined in a state where the peak portions 1a and valley portions 1b of the corrugated steel plates 1 face each other. The opposing peak portions 1a are in surface contact. A plurality of joining holes (not shown) for attaching the joining member 3 are formed at intervals along the longitudinal direction X in the peak portion 1a of the corrugated steel plate 1. Further, the two corrugated steel plates 1, 1 are combined so that the leading edges of the lateral flange portions 10 face outward. This is considered in view of the connection work of the earth retaining panels 100 and 101 in the vertical and horizontal directions.

[0028] The two corrugated steel plates 1, 1 have the peak portions 1a in surface contact joined by a joining member 3. The two corrugated steel plates 1, 1 have the same cross-sectional shape of the corrugation. Thus, the two corrugated steel plates 1, 1 can be arranged so as to face in opposite directions in the thickness direction (Z direction), and the flat portions of the corrugations can be butted and joined. Since the peak portions 1a and the valley portions 1b of the two corrugated steel plates 1, 1 are flat in the cross-sectional shape, they are easily joined to each other when overlapped in the thickness direction (Z direction), and since the contact area is also large, there is an advantage that they easily transmit the load to each other.

[0029] The joining member 3 is, as an example, a bolt and a nut. The two corrugated steel plates 1, 1 are joined by fastening the shaft portion of the bolt inserted through the joining holes with a nut. The joining member 3 is provided in a plurality at intervals along the longitudinal direction X at each peak portion 1a in surface contact. Note that the joining member 3 does not necessarily have to be provided at each peak portion 1a, and it may be provided only at some of the peak portions 1a. That is, the position and the number of the joining member 3 are not limited to the illustrated configuration, and are appropriately changed and provided according to the size and shape of the corrugated steel plates 1, 1.

[0030] Also, both end portions of the two corrugated steel plates 1, 1 in the short-side direction Y are joined by welding 4. Specifically, recessed portions 10b are formed in the upper and lower portions of the two combined corrugated steel plates 1, 1. The two corrugated steel plates 1, 1 are joined by welding the recessed portions 10b. Note that the opposing corrugated steel plates 1, 1 may be configured to be joined by welding 4 only at one of the two end portions in the short-side direction Y.

[0031] Note that in order to improve the cross-sectional rigidity, it is desirable that the opposing corrugated steel plates 1, 1 are joined by the joining member 3 and also joined by welding 4, but a configuration in which they are joined by only one of the configuration of joining by the joining member 3 and the configuration of joining by welding 4 may be used. Further, a configuration in which the configuration of joining by the joining member 3 and the configuration of joining by welding 4 are omitted, and the opposing corrugated steel plates 1, 1 are joined via the vertical flange portion 2 may be used.

[0032] The vertical flange portion 2 also has the same configuration as the vertical flange portion 2 of the soil retaining panel 101 described above. The vertical flange portion 2 is composed of a single steel plate with respect to the two corrugated steel plates 1 and 1, and is provided by welding to both end edges in the longitudinal direction X of the two corrugated steel plates 1 and 1. Incidentally, as shown in FIG. 5, the vertical flange portion 2 may be composed of a single plate, or as shown in FIG. 7, it may be provided on each corrugated steel plate 1 respectively. When the vertical flange portions 2 are provided on each corrugated steel plate 1 respectively, the opposing end faces of the vertical flange portions 2 may be joined by welding or the like. Also, although not shown, the vertical flange portion 2 may be provided only on the corrugated steel plate 1 located on the excavation side among the two corrugated steel plates 1 and 1. This is because it is necessary to provide the vertical flange portion 2 on the corrugated steel plate 1 located on the excavation side in order to connect the adjacent soil retaining panels 100 in the circumferential direction.

[0033] Incidentally, the soil retaining panel 100 is not limited to the configuration in which the two corrugated steel plates 1 and 1 shown in the figure are combined and joined. As shown in FIG. 8, the soil retaining panel 100 may have three or more corrugated steel plates 1, and may be joined in a state where the peaks 1a and the valleys 1b of the adjacent corrugated steel plates 1 are opposed to each other and combined. Thereby, the rigidity of the soil retaining panel 100 can be further increased.

[0034] Also, although the soil retaining panel is shown with a configuration in which it is linear in plan view (viewpoint in the Y direction), it may be arc-shaped, for example, according to the shape of the excavation hole.

[0035] FIG. 9 is an explanatory view showing an enlarged view of a main part of a retaining structure constructed using the retaining panel 100 according to the first embodiment. As shown in FIG. 9, the retaining panel 100 according to the first embodiment is arranged in an excavation hole 301 where high earth pressure acts or in a portion where the depth of the excavation hole 301 is deep, and then is connected to the already installed retaining panel 101 using a joining member 5. The joining member 5 is, for example, a bolt and a nut. Among the two corrugated steel plates 1, 1 of the 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 upper retaining panel 101. The vertically adjacent corrugated steel plates 1 are connected by butting their horizontal flange portions 10 against each other vertically to align the positions of the connecting holes 10a, passing the shaft portion of the bolt through the respective connecting holes 10a, and fastening the shaft portion with a nut. Among the two corrugated steel plates 1, 1 of the retaining panel 100 according to the first embodiment, the corrugated steel plate 1 located on the ground side is not connected to the corrugated steel plate 1 of the upper retaining panel 101. This is because it is easier for the worker performing the work inside the excavation hole to connect the corrugated steel plate 1 located on the excavation side to the corrugated steel plate 1 of the upper retaining panel 101.

[0036] In addition, even when connecting the retaining panel 101 to the lower stage of the 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 retaining panel 101. Also, even when two or more stages of the retaining panel 100 according to the first embodiment are arranged continuously vertically, 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 ground side may be connected to each other. Also, as a means for connecting the vertically adjacent corrugated steel plates 1, instead of bolts and nuts, for example, a connecting tool such as a clip may be used.

[0037] Also, even between adjacent earth-retaining panels 100 in the circumferential direction, only the corrugated steel plates 1 located on the excavation side are connected, and the corrugated steel plates 1 located on the natural ground side are not connected. The adjacent corrugated steel plates 1 on the left and right are connected by butting the vertical flange portions 2 to align the positions of the connection holes 2a, passing the shaft portion of the bolt through the respective connection holes 2a, and fastening the shaft portion with a nut. Note that, instead of bolts and nuts, connecting tools such as clips may be used as means for connecting adjacent earth-retaining panels 100 on the left and right.

[0038] As described above, the earth-retaining panel 100 according to the first embodiment includes a plurality of corrugated steel plates 1 formed such that the corrugated peak portions 1a and valley portions 1b extend along the longitudinal direction X, and vertical flange portions 2 provided at both ends in the longitudinal direction X of at least one corrugated steel plate 1. The plurality of corrugated steel plates 1 are joined in a state where the peak portions 1a and valley portions 1b of adjacent corrugated steel plates 1 face each other.

[0039] That is, the earth-retaining panel 100 according to the first embodiment joins the peak portions 1a and valley portions 1b of adjacent corrugated steel plates 1 in a state where they face each other in the thickness direction of the corrugated steel plate 1 and integrally combines them rigidly, so that the sectional rigidity can be improved and it can be used in an excavation hole where high earth pressure acts or in a portion where the depth of the excavation hole is deep. Therefore, by using the earth-retaining panel 100 according to the first embodiment, the installation of the reinforcing ring can be omitted. However, a configuration in which a reinforcing ring is installed on the earth-retaining panel 100 according to the first embodiment to further increase the rigidity may also be adopted.

[0040] Also, the adjacent corrugated steel plates 1, 1 are joined via the vertical flange portions 2. Also, the adjacent corrugated steel plates 1, 1 are joined by a joining member 3 between the peak portions 1a or between the valley portions 1b. Also, both ends of the adjacent corrugated steel plates 1, 1 in the short hand direction Y are joined by welding 4. With these configurations, the earth-retaining panel 100 according to the first embodiment can be integrally combined rigidly.

[0041] Embodiment 2. Next, the earth-retaining panel 100A according to Embodiment 2 will be described with reference to FIG. 10. FIG. 10 is a longitudinal sectional view showing the earth-retaining panel 100A according to Embodiment 2. Note that the same components as those of the earth-retaining panel 100 described in Embodiment 1 are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

[0042] As shown in FIG. 10, the earth-retaining panel 100A according to Embodiment 2 is composed of two corrugated steel plates, i.e., 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 Embodiment 1. That is, the first corrugated steel plate 1A has a square-wave-shaped cross section and has horizontal flange portions 10 at both ends in the short-side direction Y. The second corrugated steel plate 1B has a square-wave-shaped cross section and does not have horizontal flange portions 10 at both ends in the short-side direction Y.

[0043] As described with reference to FIG. 9 above, the corrugated steel plate 1 located on the natural ground side is not joined to the corrugated steel plate 1 of the upper earth-retaining panel 101 and the corrugated steel plate 1 of the lower earth-retaining panel 101. Therefore, the horizontal flange portion 10 of the corrugated steel plate 1 located on the natural ground side is a structurally redundant part. Thus, in the earth-retaining panel 100A according to Embodiment 2, the corrugated steel plate located on the natural ground side is the second corrugated steel plate 1B that does not have the horizontal flange portion 10. Therefore, in the earth-retaining panel 100A according to Embodiment 2, the processing of the horizontal flange portion 10 of the second corrugated steel plate 1B can be omitted, and the material cost can be reduced. Thus, the manufacturing cost can be reduced while increasing the rigid cross section.

[0044] In the earth-retaining panel 100A according to Embodiment 2 as well, the vertical flange portion 2 may be composed of a single sheet, or may be provided on the first corrugated steel plate 1A and the second corrugated steel plate 1B, respectively. When the vertical flange portion 2 is provided on the first corrugated steel plate 1A and the second corrugated steel plate 1B, respectively, the opposing end faces of the vertical flange portion 2 may be joined by welding or the like. Also, although not shown, the vertical flange portion 2 may be provided only on the first corrugated steel plate 1A located on the excavation side.

[0045] Further, the earth-retaining panel 100A according to the second embodiment is not limited to a configuration in which two corrugated steel plates are combined and joined by the first corrugated steel plate 1A and the second corrugated steel plate 1B. The earth-retaining panel 100A may have a configuration in which three or more corrugated steel plates including the first corrugated steel plate 1A and the second corrugated steel plate 1B are combined. Thereby, the rigidity of the earth-retaining panel 100 can be further increased.

[0046] The earth-retaining panel 100A according to the second embodiment has been shown to have a linear configuration in a plan view (viewpoint in the Y direction), but may be, for example, arc-shaped according to the shape of the excavation hole.

[0047] 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 longitudinal sectional view showing the earth-retaining panel 100B according to the third embodiment. Note that the same reference numerals are given to the same components as the earth-retaining panel 100 described in the first embodiment and the earth-retaining panel 100A described in the second embodiment, and the description thereof will be omitted as appropriate.

[0048] As shown in FIG. 11, the earth-retaining panel 100B according to the third embodiment also includes two corrugated steel plates 1C formed such that the peak portions 1a and the valley portions 1b of the corrugations extend along the longitudinal direction X, and vertical flange portions 2 provided at both ends in the longitudinal direction X of the corrugated steel plates 1C. The two corrugated steel plates 1C are so-called liner plates having a corrugated cross-section formed in a sine curve shape. The thickness of this corrugated steel plate 1C is, for example, about 2.7 mm to 7 mm. The corrugated steel plate 1C has lateral flange portions 10 formed by bending both end edges of the corrugations at both ends in the short direction Y. The lateral flange portions 10 are formed by bending both end edges of the corrugations of the corrugated steel plate 1C. The two corrugated steel plates 1C, 1C are joined in a state where the peak portions 1a of the corrugated steel plates 1C and the valley portions 1b are opposed to each other. The configuration for joining the two corrugated steel plates 1C, 1C is the same as that in the first and second embodiments. The opposing peak portions 1a are in surface contact. Further, the two corrugated steel plates 1C, 1C are combined so that the leading edges of the lateral flange portions 10 face outward.

[0049] In addition, in the earth 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 the corrugated steel plates 1C respectively, the opposing end faces of the vertical flange portions 2 may be joined by welding or the like. Although not shown, the vertical flange portion 2 may be provided only on the corrugated steel plate 1C located on the excavation side.

[0050] Further, the earth retaining panel 100B according to the third embodiment is not limited to a configuration in which two corrugated steel plates 1C are combined and joined. The earth retaining panel 100B may have a configuration having three or more corrugated steel plates 1C. Thereby, the rigidity of the earth retaining panel 100B can be further increased.

[0051] The earth retaining panel 100B according to the third embodiment has been shown with a linear shape in plan view (viewpoint in the Y direction), but it may be, for example, an arc shape according to the shape of the excavation hole.

[0052] As described above, the earth retaining panel 100B according to the third embodiment can improve the cross-sectional rigidity by using the corrugated steel plate 1C made of the liner plate, and can be used in an excavation hole where high earth pressure acts or in a portion where the depth of the excavation hole is deep.

[0053] The earth retaining panels (100, 100A, 100B) have been described based on the embodiments, but are not limited to the configurations of the above-described embodiments. For example, the configurations of the above-described earth retaining panels (100, 100A, 100B) are examples and may include other components. Also, the construction method of the earth retaining structure 200 described based on FIG. 4 is an example and is not limited to the above embodiment. In short, the earth retaining panels (100, 100A, 100B) include the scope of design changes and application variations that those skilled in the art normally make without departing from the technical idea thereof.

Explanation of reference numerals

[0054] 1. 1C corrugated steel plate, 1A first corrugated steel plate, 1B second corrugated steel plate, 1a crest portion, 1b trough portion, 1c web, 2 longitudinal flange portion, 2a connecting hole, 3 joining member, 4 welding, 5 joining member, 6 corner member, 10 transverse flange portion, 10a connecting hole, 10b recessed portion, 100, 100A, 100B, 101, 102 earth retaining panel, 200 earth retaining structure, 201 structure, 300 ground, 301 excavation hole, 400 well girder, X longitudinal direction, Y short transverse direction.

Claims

1. An earth retaining panel used for constructing an earth retaining structure by being installed in an excavation hole formed by excavating the ground, a plurality of corrugated steel plates formed such that the crest and trough portions of the corrugations extend along the longitudinal direction, and vertical flange portions provided at both longitudinal ends of at least one of the corrugated steel plates, wherein the plurality of corrugated steel plates are joined in a state where the crest portions and the trough portions of adjacent corrugated steel plates face each other, and each of the vertical flange portions is composed of a single steel plate with respect to the plurality of corrugated steel plates. The earth retaining panel.

2. An earth retaining panel used for constructing an earth retaining structure by being installed in an excavation hole formed by excavating the ground, a plurality of corrugated steel plates formed such that the crest and trough portions of the corrugations extend along the longitudinal direction, and vertical flange portions provided at both longitudinal ends of at least one of the corrugated steel plates, wherein the plurality of corrugated steel plates are joined in a state where the crest portions and the trough portions of adjacent corrugated steel plates face each other, wherein the plurality of corrugated steel plates include a first corrugated steel plate having a square wave-shaped cross-section and horizontal flange portions at both ends in the short direction, and a second corrugated steel plate having a square wave-shaped cross-section and no horizontal flange portions at both ends in the short direction, and the first corrugated steel plate and the second corrugated steel plate are joined in a state where the crest portions and the trough portions face each other. The earth retaining panel.

3. The adjacent corrugated steel plates are joined via the vertical flange portions. The earth retaining panel according to Claim 1 or 2.

4. The adjacent corrugated steel plates are joined by a joining member at the crest portions or the trough portions. The earth retaining panel according to any one of Claims 1 to 3.

5. The adjacent corrugated steel plates are joined by welding at both ends in the short direction. The earth retaining panel according to any one of Claims 1 to 4.

6. The corrugated steel plate has a configuration in which the cross-section of the corrugation is formed in a square wave shape and has horizontal flange portions at both ends in the short direction. The earth retaining panel according to any one of Claims 1 to 5.

7. The corrugated steel plate has a configuration in which the cross-section of the corrugation is formed in a sine curve shape. The earth retaining panel according to any one of Claims 1 to 5.

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