Corrugated steel plate and wall structure

Abstract

To provide a corrugated steel plate that simplifies assembly work and shortens a work time, and a wall structure.SOLUTION: A corrugated steel plate comprises: a main body whose cross-sectional shape perpendicular to a width direction is corrugated; and two flat connection plates installed on both ends of the main body in the width direction. The main body has an upper connection part and a lower connection part provided on both ends in a height direction perpendicular to the width direction. The upper connection part has an upper engagement part that engages with the lower connection part of the main body adjacent to it on the upper side.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to corrugated steel plates that constitute the wall surface of a hollow structure constructed, for example, underground or underwater, and a wall structure using such corrugated steel plates.

Background Art

[0002] Conventionally, civil engineering structures such as shafts for constructing the foundation of a structure, sump wells constructed underground, and retaining walls on slopes are constructed by installing corrugated steel plates to block the ground and connecting a plurality of corrugated steel plates to form an annular or U-shaped (horseshoe-shaped) wall structure. Further, the wall structure is also applicable to uses where it is constructed underwater and forms a space inside.

[0003] Such a wall structure made of corrugated steel plates has the advantage that each of the corrugated steel plates is lightweight and easy to construct even at a site where large construction machinery cannot be used, such as in mountainous areas. On the other hand, when a large load is applied to the wall structure from the surroundings, such as when installed deep underground, a member formed of an H-shaped steel material called a reinforcing ring is sandwiched between the corrugated steel plates assembled in an annular shape to form the wall structure. Thereby, the strength of the wall structure formed by connecting the annularly assembled corrugated steel plates with the reinforcing ring is improved. However, since the reinforcing ring is attached along the lower end of the annularly combined corrugated steel plates, processing for bending the H-shaped steel along the corrugated steel plates is required.

[0004] For the purpose of solving this problem, Patent Document 1 discloses a corrugated steel plate in which a corrugated portion provided between two connection portions protrudes in the depth direction more than the two connection portions provided at both ends in the height direction of a main body extending in the width direction. Thereby, Patent Document 1 can construct a wall structure without installing a reinforcing ring.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

SUMMARY OF THE INVENTION

PROBLEMS TO BE SOLVED BY THE INVENTION

[0006] However, when the corrugated steel plate according to Patent Document 1 is connected to the corrugated steel plates arranged on the upper and lower sides, it is joined by bolts and nuts. Thus, since the operator needs to use bolts and nuts for joining, the number of bolts and nuts to be tightened is large, and the construction work takes time.

[0007] The present invention has been made to solve the above problems, and provides a corrugated steel plate and a wall structure that simplify the assembly construction and shorten the working time.

MEANS FOR SOLVING THE PROBLEMS

[0008] The corrugated steel plate according to the present invention includes a main body having a cross-sectional shape perpendicular to the width direction processed into a waveform, and two flat connection plates installed at both ends in the width direction of the main body. The main body has an upper connection portion and a lower connection portion provided at both ends in the height direction orthogonal to the width direction. The upper connection portion has an upper engaging portion that engages with the lower connection portion of the main body adjacent to the upper side.

EFFECTS OF THE INVENTION

[0009] According to the present invention, the upper engaging portion of the upper connection portion engages with the lower connection portion of the main body adjacent to the upper side. Thereby, the upper connection portion and the lower connection portion of the main body adjacent to the upper side are connected. Thus, when connecting the main bodies adjacent in the vertical direction, it is not necessary to use bolts and nuts. Therefore, the assembly construction can be simplified and the working time can be shortened.

BRIEF DESCRIPTION OF THE DRAWINGS

[0010]

Figure 1

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Modes for Carrying Out the Invention

[0011] Hereinafter, the corrugated steel plate and the wall structure according to the embodiment will be described with reference to the drawings and the like. In the following drawings including FIG. 1, the relative dimensional relationships and shapes of the respective constituent members may be different from the actual ones. Further, in the following drawings, those denoted by the same reference numerals are the same or corresponding ones, and this shall be common throughout the entire text of the specification. In addition, for the sake of easy understanding, terms indicating directions (for example, up, down, left, right, front, rear, front and back, etc.) are appropriately used, but their notations are for the convenience of explanation and do not limit the arrangement, direction, and orientation of the device, instrument, or component, etc.

[0012] Embodiment 1. [Wall structure 100] FIG. 1 is a perspective view of a wall structure 100 according to Embodiment 1. FIG. 2 is a plan view and a side view of the wall structure 100 according to Embodiment 1. FIG. 3 is a perspective view of the corrugated steel plate 10 constituting the wall structure 100 according to Embodiment 1. The wall structure 100 will be described with reference to FIGS. 1 to 3. The wall structure 100 is a civil engineering structure such as a shaft for constructing the foundation of a structure or a sump well constructed underground, and is constructed in a vertical hole 90 formed by excavating the natural ground 92 (see FIG. 8). In Embodiment 1, the wall structure 100 is formed in a circular tube shape, but is not limited to a circular tube shape. The wall structure 100 can be formed, for example, in an oval shape, an elliptical shape, a rectangular shape, or a horseshoe shape in a plan view, and is not limited to a tubular shape.

[0013] The wall structure 100 according to Embodiment 1 has a structure in which a plurality of corrugated steel plates 10 are connected so as to form an annular body 50, and the annular bodies 50 are connected to each other in the axial direction. The wall structure 100 shown in FIGS. 1 and 2 has a six-stage structure of the annular body 50.

[0014] [Annular body 50] Each annular body 50 constituting the wall structure 100 is formed by connecting a plurality of corrugated steel plates 10 shown in FIG. 3, and is formed by connecting the end portions in the width direction of the corrugated steel plates 10 to each other. The corrugated steel plate 10 includes a main body 10a having a waveform in the height direction, that is, the z direction in FIG. 3, and flat connection plates 20 at both ends in the width direction of the main body 10a, that is, the θ direction in FIG. 3. The main body 10a is a member extending in the width direction. The connection plate 20 is welded to the end surface in the width direction of the main body 10a. In the annular body 50, the corrugated steel plates 10 adjacent to each other in the width direction have the connection plates 20 joined to each other by a joining member 40 (not shown) such as a bolt 41 and a nut 42 using a plate hole 21, thereby forming a circumferential connection portion 11.

[0015] The annular bodies 50 formed by the corrugated steel plates 10 are joined to each other by an upper engaging portion 70 and a lower engaging portion 80 (see FIG. 5) at the end portions in the z direction of the main body 10a of the corrugated steel plate 10. As shown in FIG. 2(b), the corrugated steel plate 10 of the upper annular body 50A and the corrugated steel plate 10 of the lower annular body 50B are joined with the positions at both ends in the width direction shifted from each other. In Embodiment 1, the corrugated steel plate 10 located on the upper side and the corrugated steel plate 10 located on the lower side are joined with a shift of half the length in the width direction. Thereby, the wall structure 100 can suppress variations in rigidity at each position in the θ direction. However, the amount of shift of the corrugated steel plates 10 located on the upper and lower sides is not limited to half the length in the width direction, and it can also be shifted by the pitch of a plurality of connection holes 13a formed in the upper connection portion 13 and the lower connection portion 14. For example, although 10 connection holes 13a are formed in the upper connection portion 13 and the lower connection portion 14 of the corrugated steel plate 10 in FIG. 3, the connection holes 13a of the corrugated steel plate 10 located on the lower side may be shifted by 1 to 5 pitches and connected with respect to the corrugated steel plate 10 located on the upper side.

[0016] [Corrugated steel plate 10] FIG. 4 is a cross-sectional view of the corrugated steel plate 10 according to Embodiment 1. FIG. 4 shows a cross-section perpendicular to the width direction of the corrugated steel plate 10, and shows a cross-section including the central axis C of the wall structure 100 shown in FIG. 2. The main body 10a of the corrugated steel plate 10 is corrugated in a cross-section perpendicular to the width direction. In Embodiment 1, the corrugation is in the shape of a rectangular wave with rounded corners, and planes parallel to each other are formed on the outer and inner sides of the wall structure 100.

[0017] The main body 10a formed in a trapezoidal wave shape includes an inner flange portion 16 that protrudes inside the annular body 50 and outer flange portions 17 and 18 that protrude outside the annular body 50 in the cross-section of FIG. 4. The inner flange portion 16 and the outer flange portions 17 and 18 are formed substantially parallel to each other. The inner flange portion 16 and the outer flange portions 17 and 18 are connected by a web portion 15. The web portion 15 has a surface that extends in the depth direction, that is, the r direction in FIG. 4, in the cross-section of FIG. 4, and is slightly inclined with respect to the r axis. The inclination direction of the web portion 15 is such that when the main body 10a is viewed from the central axis C, the open end of the trough portion of the corrugated shape is wide and the bottom of the trough is narrow. By being configured in this way, the main body 10a is easily demolded when performing plastic processing for corrugation, and manufacturing becomes easy.

[0018] In addition, by forming the web portion 15 at an angle close to being parallel to the r-axis, the widths of the inner flange portion 16 and the outer flange portions 17 and 18 are increased. As a result, the corrugated steel sheet 10 has higher rigidity when a bending moment is applied in the r-direction. When the wall structure 100 in FIG. 1 receives a load in the plane direction, that is, the r-direction, a bending moment is applied to the corrugated steel sheet 10 in the r-direction. At this time, the section modulus about the neutral axis N of bending of the corrugated steel sheet 10 increases as the widths of the inner flange portion 16 and the outer flange portions 17 and 18, which are far from the neutral axis N, are larger. Therefore, by configuring the web portion 15 at an angle close to being parallel to the r-axis, the width dimensions of the inner flange portion 16 and the outer flange portions 17 and 18 in the z-direction are increased, and the corrugated steel sheet 10 has higher rigidity. In the cross section, the angle of the web portion 15 with respect to the inner flange portion 16 and the outer flange portions 17 and 18 is preferably set to be 70 degrees or more and 90 degrees or less. That is, it is desirable that the web portion 15 be set at an angle located on the side of 0 degrees or more and 20 degrees or less with respect to the vertical direction with respect to the inner flange portion 16 and the outer flange portions 17 and 18. For example, the angle of the web portion 15 of the corrugated steel sheet 10 shown in FIG. 4 is set to 4.5 degrees or 6 degrees. That is, in an actual product, it is set in the range located on the side of 3 degrees or more and 7 degrees or less, and is set to improve mass productivity while ensuring strength and rigidity. More preferably, in order to further improve strength and rigidity, the web portion 15 may be set at 1 degree or more and 3 degrees or less with respect to the vertical direction with respect to the inner flange portion 16 and the outer flange portions 17 and 18. By being configured in this way, the corrugated steel sheet 10 can suppress defects during die forming or roll forming while ensuring higher rigidity, and also improves workability.

[0019] In addition, in the first embodiment, the inner flange portion 16 and the outer flange portions 17 and 18 are formed with the same plate thickness as the web portion 15, but the plate thickness may be made thicker than that of the web portion 15. By being configured in this way, the cross-sectional areas of the inner flange portion 16 and the outer flange portions 17 and 18, which are far from the neutral axis N, are increased, and the corrugated steel sheet 10 can further increase the section modulus.

[0020] In addition, upper connection portions 13 and lower connection portions 14 are formed at both end portions of the corrugated steel plate 10 in the z direction. Connection holes 13a are formed perpendicularly to the z direction in flat portions of the upper connection portions 13 and the lower connection portions 14. The upper connection portions 13 and the lower connection portions 14 are parallel to the r direction.

[0021] The upper connection portions 13 and the lower connection portions 14 are formed with a dimension h in the depth direction of the main body 10a of the corrugated steel plate 10, and may be formed with a dimension such that they can be connected and fixed to other corrugated steel plates 10. The thickness of the waveform formed in the main body 10a, that is, the dimension H from the outer flange portions 17, 18 to the inner flange portion 16, is formed larger than the dimension h of the upper connection portions 13 and the lower connection portions 14. By being formed in this way, the corrugated steel plate 10 can secure a large section modulus. Further, since the upper connection portions 13 and the lower connection portions 14 are end portions in the z direction and are portions that do not connect to the inner flange portion 16 and have a small contribution to the section modulus, by reducing the dimension h in the depth direction of the corrugated steel plate 10, the amount of material used can be suppressed while ensuring rigidity. Note that the portion where the web portion 15, the inner flange portion 16, and the outer flange portions 17, 18 are formed between the upper connection portion 13 and the lower connection portion 14 in the z direction is collectively referred to as the corrugated portion w.

[0022] [Upper engaging portion 70 and lower engaging portion 80] FIG. 5 is a cross-sectional view of the corrugated steel plate 10 according to Embodiment 1. As shown in FIG. 5, the corrugated steel plate 10 has an upper engaging portion 70 and a lower engaging portion 80. The upper engaging portion 70 engages with the lower engaging portion 80 of the lower connection portion 14 of the main body 10a adjacent to the upper side. The upper engaging portion 70 has an upper vertical portion 71 and an upper horizontal portion 72. The upper vertical portion 71 is a member extending upward from the upper connection portion 13. In Embodiment 1, the upper vertical portion 71 extends upward from the tip of the upper connection portion 13, but the upper vertical portion 71 may extend upward from the middle of the upper connection portion 13. The upper horizontal portion 72 is a member extending from the upper vertical portion 71 in the depth direction orthogonal to the width direction and the height direction. That is, the upper horizontal portion 72 is parallel to the upper connection portion 13. In Embodiment 1, the upper horizontal portion 72 extends in the depth direction from the tip of the upper vertical portion 71, but the upper horizontal portion 72 may extend in the depth direction from the middle of the upper vertical portion 71. Note that the upper engaging portion 70 is, for example, a channel steel and is welded to the upper connection portion 13. Alternatively, the steel plate may be bent into an L shape and welded.

[0023] The lower engaging portion 80 engages with the upper engaging portion 70 of the upper connecting portion 13 of the main body 10a adjacent to it on the lower side. The lower engaging portion 80 has a lower vertical portion 81 and a lower horizontal portion 82. The lower vertical portion 81 is a member extending downward from the lower connecting portion 14. In the first embodiment, the lower vertical portion 81 extends downward from the tip of the lower connecting portion 14, that is, the position (predetermined position) where it engages with the upper engaging portion 70, but the lower vertical portion 81 may extend downward from the middle of the lower connecting portion 14. The lower horizontal portion 82 is a member extending from the lower vertical portion 81 in the depth direction orthogonal to the width direction and the height direction. That is, the lower horizontal portion 82 is parallel to the lower connecting portion 14. In the first embodiment, the lower horizontal portion 82 extends in the depth direction from the tip of the lower vertical portion 81, but the lower horizontal portion 82 may extend in the depth direction from the middle of the lower vertical portion 81. The upper surface of the lower horizontal portion 82 abuts against the lower surface of the upper horizontal portion 72. Here, the direction in which the lower horizontal portion 82 extends is the opposite direction to the direction in which the upper horizontal portion 72 extends. For this reason, the upper horizontal portion 72 is inserted into the space surrounded by the lower vertical portion 81 and the lower horizontal portion 82. Thereby, the upper engaging portion 70 and the lower engaging portion 80 are engaged. Note that the lower engaging portion 80 is, for example, an L shape formed by bending a channel steel, a plate material, etc., and is welded to the lower connecting portion 14.

[0024] FIG. 6 is an assembly view of the corrugated steel plate 10 according to the first embodiment. As shown in FIG. 6, the corrugated steel plate 10 located on the upper side and the corrugated steel plate 10 located on the lower side are joined with a half shift in the length in the width direction. Here, the upper engaging portion 70 is provided at a position avoiding the portion corresponding to the connecting plate 20 adjacent to it on the upper side in the upper connecting portion 13. That is, although the upper engaging portion 70 is provided over the entire width direction of the upper connecting portion 13, it is not provided in the portion corresponding to the connecting plate 20 adjacent to it on the upper side. In the first embodiment, the upper engaging portion 70 is provided at a position avoiding the center in the width direction of the corrugated steel plate 10 in the upper connecting portion 13. Thereby, it is possible to suppress the upper engaging portion 70 from interfering with the connecting plates 20 (circumferential connecting portions 11) of the corrugated steel plates 10 adjacent to each other in the width direction.

[0025] [Joining of Corrugated Steel Sheets 10 in the Height Direction] FIG. 7 is an assembled cross-sectional view of the corrugated steel sheet 10 according to Embodiment 1. As shown in FIG. 7, when the corrugated steel sheet 10 located on the lower side is joined to the corrugated steel sheet 10 located on the upper side, the upper engaging portion 70 of the lower corrugated steel sheet 10 is opposed to the lower engaging portion 80 of the upper corrugated steel sheet 10. Then, the upper horizontal portion 72 of the upper engaging portion 70 is inserted into the space surrounded by the lower vertical portion 81 and the lower horizontal portion 82 of the lower engaging portion 80. After that, the corrugated steel sheet 10 located on the lower side descends, and the lower surface of the upper horizontal portion 72 located on the lower side abuts against the upper surface of the lower horizontal portion 82 of the corrugated steel sheet 10 located on the upper side. As a result, the corrugated steel sheet 10 located on the lower side is hooked on the corrugated steel sheet 10 located on the upper side, and the corrugated steel sheets 10 are joined together.

[0026] [Wall Structure 100] FIG. 8 is a cross-sectional view of the installation state of the wall structure 100 according to Embodiment 1. The wall structure 100 installed inside the vertical hole 90 as in the wall structure 100 according to Embodiment 1 is installed as follows. First, a vertical hole 90 with a predetermined depth is constructed, and the annular bodies 50 of the corrugated steel sheets 10 are assembled and arranged in about 1 to 3 stages inside it. Then, a floor beam is assembled at the upper part of the vertical hole 90, and the annular body 50 at the uppermost part is fixed to the floor beam. At this time, the position, verticality, and shape of the annular body 50 are adjusted. After confirming that the accuracy is sufficient, the surroundings of the annular body 50 are backfilled.

[0027] After backfilling the surroundings of the annular body 50, the bottom surface of the vertical hole 90 inside the annular body 50 is excavated. When the depth of the vertical hole 90 becomes larger than the height dimension of the corrugated steel sheet 10, a corrugated steel sheet 10 is connected to the lower end of the wall structure 10 with the upper end fixed to the floor beam, and a new annular body 50 is connected. By repeating the excavation of the bottom surface of the vertical hole 90 and the assembly of the corrugated steel sheet 10, the wall structure 100 is constructed inside the vertical hole 90 to the required depth.

[0028] Since the wall structure 100 extends downward while excavating the bottom of the vertical hole 90, a gap 91 is formed between the vertical hole 90 and the outer peripheral surface of the wall structure 100. In order to ensure the stability of the natural ground 92 and the like, the gap 91 is filled with a filling material 93 such as mortar through a through hole (not shown) near the center of the main body 10a.

[0029] According to the first embodiment, the upper engaging portion 70 of the upper connection portion 13 engages with the lower connection portion 14 of the main body 10a adjacent to it on the upper side. As a result, the upper connection portion 13 and the lower connection portion 14 of the main body 10a adjacent to it on the upper side are connected. In this way, when connecting the main bodies 10a adjacent in the vertical direction, it is not necessary to use the bolts 41 and nuts 42. Therefore, the assembly construction can be simplified and the working time can be shortened.

[0030] [Comparative Example] FIG. 9 is an assembled cross-sectional view of the corrugated steel plate 110 according to the comparative example. Next, the comparative example will be described. When the corrugated steel plate 110 according to the comparative example is connected to the corrugated steel plates 110 arranged on the upper side and the lower side, it is joined by a joining member 40 such as bolts 41 and nuts 42. Since a plurality of corrugated steel plates 110 are joined in the width direction, the number of bolts 41 in the width direction is quite large. For this reason, it takes a considerably long time to construct the wall structure 100. In this way, in the comparative example, since the operator needs to join using a plurality of bolts 41 and nuts 42, the working time until assembly becomes long.

[0031] On the other hand, in the first embodiment, when connecting to the corrugated steel plates 10 arranged on the upper side and the lower side, an insertion type using the upper engaging portion 70 is used. For this reason, since the bolts 41 and nuts 42 are not required, the working time can be shortened.

[0032] [Modification Example] FIG. 10 is a cross-sectional view of the corrugated steel plate 120 according to the modified example. As shown in FIG. 10, the upper horizontal portion 72 of the upper engaging portion 70 has a plurality of upper protruding portions 73 extending downward at a predetermined interval. In the modified example, the case where the upper protruding portion 73 is provided at the tip of the upper horizontal portion 72 is illustrated, but the upper protruding portion 73 may be provided in the middle of the upper horizontal portion 72. And a plurality of lower holes 83 are formed in the lower horizontal portion 82 at a predetermined interval. The lower holes 83 are for inserting the upper protruding portions 73 of the upper horizontal portion 72 of the upper engaging portion 70 of the main body 10a adjacent to the lower side. The inner diameter of the lower holes 83 is wider than the outer diameter of the upper protruding portions 73. Thereby, the upper protruding portions 73 are smoothly inserted into the lower holes 83. Note that the inner diameter of the lower holes 83 and the outer diameter of the upper protruding portions 73 can be changed as appropriate.

[0033] When the corrugated steel plate 120 located on the lower side is joined to the corrugated steel plate 120 located on the upper side, the upper engaging portion 70 of the lower corrugated steel plate 120 is opposed to the lower engaging portion 80 of the upper corrugated steel plate 120. Then, the upper horizontal portion 72 of the upper engaging portion 70 is inserted into the space surrounded by the lower vertical portion 81 and the lower horizontal portion 82 of the lower engaging portion 80. Thereafter, the corrugated steel plate 120 located on the lower side descends, and the lower surface of the upper horizontal portion 72 located on the lower side abuts against the upper surface of the lower horizontal portion 82 of the corrugated steel plate 120 located on the upper side. At this time, the upper protruding portions 73 are inserted into the lower holes 83. Thereby, the corrugated steel plate 120 located on the lower side is hooked on the corrugated steel plate 120 located on the upper side, and the corrugated steel plates 120 are joined to each other, and it is possible to suppress the corrugated steel plates 120 from shifting in the horizontal direction.

[0034] Embodiment 2. FIG. 11 is a cross-sectional view of the corrugated steel plate 210 according to Embodiment 2. In Embodiment 2, the structures of the upper engaging portion 70 and the lower engaging portion 80 are different from those in Embodiment 1. In Embodiment 2, parts common to Embodiment 1 are denoted by the same reference numerals and the description thereof is omitted, and the description will be centered on the differences from Embodiment 1.

[0035] As shown in Fig. 11, in addition to the upper engaging portion 70 having an upper vertical portion 71 and an upper horizontal portion 72, it also has an upper tip portion 74. The upper tip portion 74 is a member that extends downward from the upper horizontal portion 72. In the first embodiment, the upper tip portion 74 extends downward from the tip of the upper horizontal portion 72, but the upper tip portion 74 may also extend downward from the middle of the upper horizontal portion 72. On the other hand, the lower engaging portion 80 is only the lower vertical portion 81 that extends from the lower connecting portion 14 toward the web 15, and is joined to the inside (toward the web 15) of the lower connecting portion 14, for example, made of angle steel, round steel, steel plate, etc.

[0036] Fig. 12 is an assembled cross-sectional view of the corrugated steel plate 210 according to the second embodiment. As shown in Fig. 12, when the corrugated steel plate 210 located on the lower side is joined to the corrugated steel plate 210 located on the upper side, the upper engaging portion 70 of the lower corrugated steel plate 210 is opposed to the lower engaging portion 80 of the upper corrugated steel plate 210. Then, the upper tip portion 74 of the upper engaging portion 70 is moved so as to cross over the lower vertical portion 81 of the lower engaging portion 80. After that, the corrugated steel plate 210 located on the lower side descends, and the lower engaging portion 80 of the corrugated steel plate 210 located on the upper side is surrounded by the upper vertical portion 71, the upper horizontal portion 72, and the upper tip portion 74 of the corrugated steel plate 210 located on the lower side. Thereby, the corrugated steel plate 210 located on the lower side is hooked on the corrugated steel plate 210 located on the upper side, and the corrugated steel plates 210 are joined together. Also, since the upper tip portion 74 of the corrugated steel plate 210 located on the lower side is hooked on the lower vertical portion 81 of the corrugated steel plate 210 located on the upper side, it is possible to prevent the corrugated steel plate 210 located on the lower side from falling off.

[0037] Embodiment 3. Fig. 13 is a cross-sectional view of the corrugated steel plate 310 according to the third embodiment. The third embodiment is different from the first embodiment in that the upper horizontal portion 72 has an upper insertion portion 75 and there is no lower engaging portion 80. In the third embodiment, parts common to the first and second embodiments are denoted by the same reference numerals and the description thereof is omitted, and the description will be centered on the differences from the first and second embodiments.

[0038] As shown in FIG. 13, the upper horizontal portion 72 of the upper engaging portion 70 has an upper insertion portion 75. The upper insertion portion 75 is inserted into a connection hole 13a formed in the lower connection portion 14 of the main body 10a adjacent to the upper side. In the third embodiment, the case where the upper insertion portion 75 is provided at the tip of the upper horizontal portion 72 is illustrated, but the upper insertion portion 75 may be provided in the middle of the upper horizontal portion 72. Also, as described above, in the third embodiment, the lower engaging portion 80 does not exist.

[0039] FIG. 14 is an assembled cross-sectional view of the corrugated steel plate 310 according to the third embodiment. As shown in FIG. 14, when the corrugated steel plate 310 located on the lower side is joined to the corrugated steel plate 310 located on the upper side, the upper engaging portion 70 of the lower corrugated steel plate 310 is opposed to the lower connection portion 14 of the upper corrugated steel plate 310. Then, the upper insertion portion 75 of the upper engaging portion 70 is moved so as to exceed the tip of the lower connection portion 14. Thereafter, the corrugated steel plate 310 located on the lower side descends, and the upper insertion portion 75 of the corrugated steel plate 310 located on the lower side is inserted into the connection hole 13a of the lower connection portion 14 of the corrugated steel plate 310 located on the upper side. Thereby, the corrugated steel plate 310 located on the lower side is hooked on the corrugated steel plate 310 located on the upper side, and the corrugated steel plates 310 are joined to each other. Also, since the upper insertion portion 75 of the corrugated steel plate 310 located on the lower side is inserted into the connection hole 13a of the corrugated steel plate 310 located on the upper side, it is possible to suppress the corrugated steel plate 310 located on the lower side from falling off.

[0040] (Modification example) FIG. 15 is an assembled cross-sectional view of the corrugated steel plate 410 according to a modified example of Embodiment 3. As shown in FIG. 15, in the modified example, instead of the upper insertion portion 75, a horizontal hole 72a is formed at the same position as the position where the upper insertion portion 75 is provided. The horizontal hole 72a is the same hole as the connection hole 13a. When the corrugated steel plates 410 are joined together with the horizontal hole 72a and the connection hole 13a aligned, a taper pin 76 is inserted into the horizontal hole 72a and the connection hole 13a. Thereby, it is possible to prevent the corrugated steel plates 310 from shifting or falling off. Note that other than the taper pin 76 is also acceptable. Any shape that does not fall out when inserted into the horizontal hole 72a and the connection hole 13a is fine. Further, the insertion members may be connected.

[0041] The configurations shown in the above embodiments are merely examples, and it is possible to combine them with other known techniques, and it is also possible to omit or change a part of the configuration without departing from the gist.

Explanation of Reference Numerals

[0042] 10 Corrugated steel plate, 10a Main body, 11 Circumferential connection portion, 13 Upper connection portion, 13a Connection hole, 14 Lower connection portion, 15 Web portion, 16 Inner flange portion, 17, 18 Outer flange portion, 20 Connection plate, 21 Plate hole, 40 Joining member, 41 Bolt, 42 Nut, 50, 50A, 50B Annular body, 70 Upper engaging portion, 71 Upper vertical portion, 72 Upper horizontal portion, 72a Horizontal hole, 73 Upper protrusion, 74 Upper tip portion, 75 Upper insertion portion, 76 Taper pin, 80 Lower engaging portion, 81 Lower vertical portion, 82 Lower horizontal portion, 83 Lower hole portion, 90 Vertical hole, 91 Gap, 92 Ground, 93 Filling material, 100 Wall structure, 110 Corrugated steel plate, 120 Corrugated steel plate, 210 Corrugated steel plate, 310 Corrugated steel plate, 410 Corrugated steel plate, C Central axis, H Dimension, N Neutral axis, h Dimension, w Corrugated processing portion.

Claims

1. A main body having a corrugated cross-sectional shape perpendicular to the width direction, and two flat connection plates installed at both ends in the width direction of the main body. The main body has an upper connection part and a lower connection part provided at both ends in the height direction perpendicular to the width direction. The upper connection part has an upper engaging part that engages with the lower connection part of the main body adjacent to it on the upper side. Corrugated steel sheet.

2. The upper engaging part has an upper vertical part extending upward from the upper connection part, and an upper horizontal part extending from the upper vertical part in the depth direction perpendicular to the width direction and the height direction. The corrugated steel sheet according to Claim 1.

3. In the lower connection part, connection holes are formed in a plane perpendicular to the height direction, and the upper horizontal part has an upper insertion part inserted into the connection holes formed in the lower connection part of the main body adjacent to it on the upper side. The corrugated steel sheet according to Claim 2.

4. The lower connection part has a lower engaging part that engages with the upper engaging part of the upper connection part of the main body adjacent to it on the lower side. The corrugated steel sheet according to Claim 1 or 2.

5. The upper engaging part has an upper vertical part extending upward from the upper connection part, and an upper horizontal part extending from the upper vertical part in the depth direction perpendicular to the width direction and the height direction. The lower engaging part has a lower vertical part extending downward from the lower connection part, and a lower horizontal part extending from the lower vertical part in the depth direction perpendicular to the width direction and the height direction, and the upper surface of which abuts against the lower surface of the upper horizontal part. The corrugated steel sheet according to Claim 4.

6. The upper horizontal part has an upper protrusion extending downward, and in the lower horizontal part, a lower hole part into which the upper protrusion of the upper horizontal part of the upper engaging part of the main body adjacent to it on the lower side is inserted is formed. The corrugated steel sheet according to Claim 5.

7. The upper engaging part has an upper vertical part extending upward from the upper connection part, and an upper horizontal part extending from the upper vertical part in the depth direction perpendicular to the width direction and the height direction, and an upper tip part extending downward from the upper horizontal part. The lower connection part has a lower vertical part that engages with the upper engaging part of the upper connection part of the main body adjacent to it on the lower side. The corrugated steel sheet according to Claim 1.

8. The upper engaging part is provided at a position in the upper connection part avoiding the part corresponding to the connection plate adjacent to it on the upper side. The corrugated steel sheet according to Claim 1 or 2.

9. A wall structure formed by combining the corrugated steel plates according to claim 1 or 2 .

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