Connecting hardware

Abstract

To provide a connecting metal fitting capable of maintaining the connection between adjacent flanges even when the vertically adjacent flanges are displaced relative to each other in the radial direction of the drilling hole due to the fact that earth pressure in the radial direction from the ground side toward the drilling hole acts on the earth retaining member, nor the insertion part is not pulled out from the connection hole.SOLUTION: The connecting metal fitting includes: a plate-shaped connecting metal fitting main body; an insertion part that is formed of the connecting metal fitting main body by bending the connecting metal fitting main body into an L shape from one end edge to the other side thereof and is inserted into a connecting hole formed in flange; and a clamping part that is formed by bending the connecting metal fitting main body into a U-shape from the other end to the one side to clamp the edge of the butted flanges together with the connecting metal fitting main body. In a stepped part that connects the connecting metal fitting main body and the insertion part, a hook is provided to hook the opening edge of the connecting hole when the connected adjacent flanges are displaced relative to each other in the radial direction of the drilling hole.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a connecting fitting for connecting earth retaining members having flanges to each other.

Background Art

[0002] Conventionally, as disclosed in Patent Document 1 for example, a plurality of earth retaining members having flanges in which connecting holes are formed are arranged along the inner wall surface of an excavation hole, and the flanges of adjacent earth retaining members are abutted against each other and connected to each other. A connecting fitting is known. This connecting fitting includes a plate-shaped connecting fitting main body portion, an insertion portion formed by bending L-shaped from one end edge of the connecting fitting main body portion to one surface side of the connecting fitting main body portion and inserted into a connecting hole formed in the flange, and from the other end edge of the connecting fitting main body portion. A clamping portion is formed by bending U-shaped to one surface side of the connecting fitting main body portion and clamping the edge of the abutted flange together with the connecting fitting main body portion. In the connecting fitting, an insertion portion is formed on an extension line in the direction in which the connecting fitting main body portion extends. An insertion portion for inserting the edges of two flanges is formed between the connecting fitting main body portion and the clamping portion. The connecting fitting connects the two flanges by the insertion portion inserted into the connecting hole abutting against one surface of the two overlapped flanges and sandwiching the edges of the two flanges inserted into the insertion portion between the connecting fitting main body portion and the clamping portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Multiple earth retaining members arranged along the inner wall surface of an excavation hole are subjected to radial earth pressure from the ground towards the excavation hole, and there is a risk that adjacent earth retaining members vertically may be displaced relative to each other in the radial direction of the excavation hole. In cases where the insertion part is formed on the extension line in the direction in which the main body of the connecting fitting extends, as disclosed in Patent Document 1, if the relative displacement of adjacent earth retaining members vertically is large, there is a risk that the insertion part of the connecting fitting may come out of the connecting hole due to the force with which the edge of the flange comes out of the insertion part of the connecting fitting.

[0005] The present invention aims to solve the above problems by providing a connecting fitting that, even when radial earth pressure from the ground towards the excavation hole acts on the earth retaining member and causes relative displacement of adjacent flanges in the radial direction of the excavation hole, prevents the insertion part from coming out of the connecting hole and maintains the connected state of adjacent flanges. [Means for solving the problem]

[0006] The connecting fitting according to the present invention is a connecting fitting for arranging a plurality of earth retaining members having flanges with connecting holes along the inner wall surface of an excavation hole, and connecting adjacent earth retaining members with their flanges abutted together, comprising: a plate-shaped connecting fitting body; an insertion part formed by bending one end edge of the connecting fitting body toward one side of the connecting fitting body and inserting into the connecting hole formed in the flange; and a clamping part formed by bending the other end edge of the connecting fitting body toward the one side of the connecting fitting body and clamping together the abutted flange edges with the connecting fitting body, wherein a step portion connecting the connecting fitting body and the insertion part is provided with a hooking part that hooks onto the opening edge of the connecting hole when the connected adjacent flanges are displaced relative to each other in the radial direction of the excavation hole. Furthermore, the latching portion is formed by inclining the stepped portion from one end of the connecting fitting body where the insertion portion is provided toward the other end edge of the connecting fitting body where the clamping portion is provided. That is the case. [Effects of the Invention]

[0007] In the connecting fitting according to the present invention, even if radial earth pressure from the ground towards the excavation hole acts on the earth retaining member and causes the vertically adjacent flanges to be displaced relative to each other in the radial direction of the excavation hole, the latching portion is latched onto the opening edge of the connecting hole before the flange edges come out of the insertion portion of the connecting fitting. Therefore, the insertion portion does not come out of the connecting hole, and the connected state of the vertically adjacent flanges can be maintained. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic perspective view showing an example of an earth retaining structure. [Figure 2] This is a perspective view showing an example of a retaining wall member that makes up a retaining wall structure. [Figure 3] Figure 2 is a longitudinal cross-sectional view of the earth retaining member shown. [Figure 4] This is an explanatory diagram showing adjacent retaining wall members connected with connecting fittings. [Figure 5] This is a perspective view showing different forms of earth retaining members that make up an earth retaining structure. [Figure 6] Figure 5 is a longitudinal cross-sectional view of the earth retaining member shown. [Figure 7] This is a perspective view showing the connecting fitting according to this first embodiment. [Figure 8] This is a plan view showing the connecting fitting according to this first embodiment. [Figure 9] This is a bottom view showing the connecting fitting according to this embodiment 1. [Figure 10] This is a schematic diagram showing the state in which the lateral flanges of the earth retaining member are connected with the connecting fitting according to this embodiment 1. [Figure 11] This is a schematic explanatory diagram showing the state in which the lateral flange of the earth retaining member is connected with the connecting fitting according to this embodiment 1, and in which earth pressure is acting on the earth retaining member. [Figure 12] (A) to (C) are explanatory diagrams showing the procedure for connecting the lateral flanges of the earth retaining member with the connecting fitting according to this embodiment 1. [Figure 13] This is a side view showing the connecting fitting according to this second embodiment. [Figure 14]It is a side view showing a modification example of the connecting fitting according to the second embodiment.

Embodiments for Carrying Out the Invention

[0009] 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, with respect to the configurations shown in each figure, the shape, size, arrangement, etc. can be appropriately changed within the scope of the present invention.

[0010] Embodiment 1. FIG. 1 is a perspective view schematically showing an example of the earth retaining structure 300. FIG. 2 is a perspective view showing an example of the earth retaining member 200 constituting the earth retaining structure 300. FIG. 3 is a longitudinal sectional view of the earth retaining member 200 shown in FIG. 2. FIG. 4 is an explanatory view showing a state in which adjacent earth retaining members 200 are connected by a connecting fitting 100.

[0011] As shown in FIGS. 1 to 4, the connecting fitting 100 according to the first embodiment arranges the earth retaining member 200 having flanges 202 and 203 in which connecting holes 202a and 203a are formed along the inner wall surface of a vertical excavation hole formed by excavating the ground, and connects the flanges 202 and 203 of adjacent earth retaining members 200 to each other in a state where the flanges 202 and 203 are abutted. First, with reference to FIGS. 1 to 4, the configuration of the earth retaining structure 300 constructed by the earth retaining member 200 will be described.

[0012] The earth retaining structure 300 is, for example, a caisson for constructing the foundation of a building structure or a sump constructed underground. As shown in FIG. 1, the earth retaining structure 300 is constructed by stacking a plurality of annular structures 301 in the axial direction of the excavation hole in a vertical excavation hole formed by excavating the ground.

[0013] Each structural element 301 constituting the earth retaining structure 300 is formed by arranging multiple earth retaining members 200 having the same section modulus in a ring shape. The earth retaining member 200 is a so-called liner plate, with a corrugated cross-section formed in a sine curve shape, as shown in Figures 2 and 3 as an example. The earth retaining member 200 comprises a single corrugated steel plate 201 formed so that the peaks and valleys of the corrugation extend along the longitudinal direction X, and vertical flanges 202 provided at both ends of the corrugated steel plate 201 in the longitudinal direction X. The corrugated steel plate 201 of the illustrated earth retaining member 200 is arc-shaped in plan view. The thickness of the corrugated steel plate 201 is approximately 2.7 mm to 7 mm as an example. The corrugated steel plate 201 is not limited to the arc shape shown, and may have a straight line in plan view or other shapes depending on the shape of the earth retaining structure 300 to be constructed.

[0014] As shown in Figures 2 and 3, the corrugated steel plate 201 has transverse flanges 203 at both ends in the short direction Y, formed by bending the edges of the corrugation. The transverse flanges 203 are flat plate-like portions formed almost perpendicular to the hole axis direction. Multiple connecting holes 203a are formed along the longitudinal direction X in the transverse flanges 203 for connecting adjacent earth retaining members 200 stacked vertically in the direction of the hole axis of the excavated hole. As shown in Figure 4, adjacent earth retaining members 200 are connected by butting the transverse flanges 203 together and using connecting fittings 100 inserted through the connecting holes 203a. Note that the number of connecting holes 203a shown is just an example and is not limited to this.

[0015] The vertical flange 202 is formed by welding plates to both end edges of the corrugated steel plate 201 in the longitudinal direction X. The thickness of the vertical flange 202 is determined according to the strength and rigidity required for the earth retaining structure 300. A plurality of connecting holes 202a for connecting adjacent earth retaining members 二百同士 arranged in the circumferential direction θ of the excavation hole are formed along the vertical direction (Y direction) in the vertical flange 202. As shown in FIG. 4, adjacent earth retaining members 200 on the left and right are abutted against the vertical flange 202 and connected by a connecting fitting 100 inserted through the connecting hole 202a. The number of the illustrated connecting holes 202a is an example and is not limited thereto.

[0016] Note that the earth retaining structure 三百 is not limited to a circular shape in the plan view shown in FIG. 1. The earth retaining structure 300 may be constructed in a rectangular shape in plan view. In this case, the earth retaining members 200 having a linear or L-shaped plan view according to the shape of the earth retaining structure 300 to be constructed are used.

[0017] Also, the earth retaining member 200 is not limited to the configuration shown in FIGS. 2 and 3, and other configurations may be used. FIG. 5 is a perspective view showing different forms of the earth retaining member 200 constituting the earth retaining structure 300. FIG. 6 is a longitudinal sectional view of the earth retaining member 200 shown in FIG. 5. For example, the earth retaining member 200 shown in FIGS. 5 and 6 is a corrugated steel plate bent and formed so that the corrugated cross section has a square wave shape. The square wave shape is, as an example, a trapezoidal wave shape with rounded corners. The earth retaining member 200 shown in FIGS. 5 and 6 is, as an example, composed of three peaks and two valleys, but the number of peaks and valleys is not limited to the illustrated number. Note that the peaks and valleys are formed so as to be substantially parallel.

[0018] Next, the connecting fitting 100 according to this embodiment 1 will be described with reference to Figures 7 to 11. Figure 7 is a perspective view showing the connecting fitting 100 according to this embodiment 1. Figure 8 is a plan view showing the connecting fitting 100 according to this embodiment 1. Figure 9 is a bottom view showing the connecting fitting 100 according to this embodiment 1. Figure 10 is a schematic explanatory diagram showing the state in which the horizontal flange 203 of the earth retaining member 200 is connected with the connecting fitting 100 according to this embodiment 1. Figure 11 is a schematic explanatory diagram showing the state in which the horizontal flange 203 of the earth retaining member 200 is connected with the connecting fitting 100 according to this embodiment 1, and earth pressure P is acting on the earth retaining member 200. In the following description, an example of connecting the horizontal flange 203 using the connecting fitting 100 will be described, but the connecting fitting 100 is used similarly when connecting the vertical flange 202.

[0019] The connecting fitting 100 according to this embodiment 1 is a fitting formed by bending sheet metal. As shown in Figures 7 to 11, the connecting fitting 100 comprises a connecting fitting body portion 1, an insertion portion 2, and a clamping portion 3.

[0020] As shown in Figures 7 to 11, the main body of the connecting fitting 1 is plate-shaped and is formed to extend long from the excavation hole side toward the ground side when the earth retaining member 200 is connected with the connecting fitting 100. An insertion portion 2 is formed on one longitudinal edge 10 of the main body of the connecting fitting 1. A clamping portion 3 is formed on the other longitudinal edge 11 of the main body of the connecting fitting 1. As shown in Figure 10, when the lateral flanges 203 of adjacent earth retaining members 200 are connected to each other, the main body of the connecting fitting 1 is formed inclined in the circumferential direction θ of the excavation hole, which is the direction in which the lateral flange 203 extends, with respect to the radial direction r of the excavation hole. This is to increase the contact area between the main body of the connecting fitting 1 and the lateral flange 203 and to connect them firmly. Ease of insertion of the insertion portion 2 into the connecting hole 203a has also been considered.

[0021] As shown in Figures 7 to 11, the main body of the connecting fitting 1 has two side edges 1a and 1b along its longitudinal direction. One side edge 1a is formed with a straight incline, while the other side edge 1b is formed to narrow towards the insertion portion 2. Therefore, the width of one end edge 10 on the side where the insertion portion 2 is formed is shorter than the width of the other end edge 11 on the side where the clamping portion 3 is formed. This is to correspond to the dimensions of the insertion portion 2 that is inserted into the connecting hole 203a formed in the transverse flange 203. Furthermore, by increasing the width of the other end edge 11 of the main body of the connecting fitting 1, the clamping portion 3 can be formed longer along the edge 203b of the transverse flange 203, allowing the clamping portion 3 to firmly clamp the edges 203b of the two transverse flanges 203. The main body of the connecting fitting 1 is provided with a protrusion 12 formed by embossing near where the insertion portion 2 is formed. The rigidity of the connecting fitting body 1 is improved by having a protrusion 12.

[0022] As shown in Figures 7 to 11, the insertion portion 2 is formed by bending it in an L-shape from one end edge 10 of the connecting fitting body 1 toward one side of the connecting fitting body 1, and is inserted into the connecting hole 203a formed in the horizontal flange 203. The insertion portion 2 is formed on the extension line in the direction in which the connecting fitting body 1 extends. The stepped portion 20 connecting the connecting fitting body 1 and the insertion portion 2 is provided with a hooking portion 4 that engages with the opening edge of the connecting hole 203a when the connected adjacent horizontal flanges 203 are displaced relative to each other in the radial direction r of the excavated hole. The hooking portion 4 is formed by inclining the stepped portion 20 from the side of the one end edge 10 of the connecting fitting body 1 where the insertion portion 2 is provided toward the side of the other end edge 11 of the connecting fitting body 1 where the clamping portion 3 is provided. The length and inclination angle of the hooking portion 4 are appropriately changed according to the plate thickness of the horizontal flange 203 and the hole diameter of the connecting hole 203a. Furthermore, the tip 2a of the insertion portion 2 may be inclined so as to abut against the surface of the lateral flange 203 when inserted into the connecting hole 203a.

[0023] As shown in Figure 7, the clamping portion 3 is formed by bending it in a U-shape from the other end edge 11 of the connecting fitting body 1 toward one side of the connecting fitting body 1, and clamps the ends 203b of the two butted transverse flanges 203 together with the connecting fitting body 1. Between the clamping portion 3 and the connecting fitting body 1, an insertion portion 30 is formed for inserting the ends 203b of the two transverse flanges 203. As shown in Figure 10, the two butted transverse flanges 203 are inserted by inserting their ends 203b into the insertion portion 30 and are clamped by the clamping portion 3 and the connecting fitting body 1. The clamping portion 3 is formed by bending it so that the distance between the insertion portions 30 is smaller than the thickness of the two overlapping transverse flanges 203. This is to firmly clamp the two transverse flanges 203. Also, as shown in Figure 7, the tip portion 3a of the clamping portion 3 is formed so that the distance between the insertion portions 30 is wider. This is to make it easier to insert the two horizontal flanges 203 into the insertion section 30.

[0024] Figures 12(A) to (C) are explanatory diagrams showing the procedure for connecting the horizontal flanges 203 of the earth retaining member 200 with the connecting fitting 100 according to this embodiment 1. To connect adjacent upper and lower horizontal flanges 203 using the connecting fitting 100 with the above configuration, first, as shown in Figure 12(A), the insertion part 2 is inserted into the two connecting holes 203a of the overlapping horizontal flanges 203. Next, as shown in Figure 12(B), with the insertion part 2 in contact with the surface of one of the horizontal flanges 203, the clamping part 3 is rotated toward the edge 203b of the horizontal flange 203, with the insertion part 2 as the center. Finally, as shown in Figure 12(C), the clamping part 3 is hammered in, for example, with a hammer, to insert the edges 203b of the two horizontal flanges 203 into the insertion part 30. At this time, the tip portion 3a of the clamping portion 3 is formed so that the spacing between the insertion portion 30 is widened, allowing the edges 203b of the two horizontal flanges 203 to be smoothly inserted into the insertion portion 30. In this way, the connecting fitting 100 connects adjacent upper and lower horizontal flanges 203 by having the insertion portion 2 inserted into the connecting hole 203a abut against one surface of the two overlapping horizontal flanges 203, and by having the edges 203b of the two horizontal flanges 203 inserted into the insertion portion 30 clamped between the connecting fitting body portion 1 and the clamping portion 3.

[0025] Incidentally, when multiple earth retaining members 200 arranged along the inner wall surface of the excavation hole are subjected to earth pressure P in the radial direction r toward the excavation hole from the ground side, there is a risk that adjacent earth retaining members 200 vertically may be displaced relative to each other in the radial direction r of the excavation hole. In this case, if the horizontal flanges 203 are connected using a connecting fitting in which the insertion part is formed on the extension line in the direction in which the main body of the connecting fitting extends, if the relative displacement of adjacent earth retaining members 200 vertically is large, there is a risk that the insertion part of the connecting fitting may come out of the connecting hole due to the force with which the end edge 203b of one of the horizontal flanges 203 comes out of the insertion part of the connecting fitting.

[0026] On the other hand, in the connecting fitting 100 according to this embodiment 1, as shown in Figures 10 and 11, when the connected adjacent horizontal flanges 203 are displaced relative to each other in the radial direction r of the excavation hole due to the earth pressure P in the radial direction r toward the excavation hole from the ground side, a hooking portion 4 is provided that hooks onto the opening edge of the connecting hole 203a.

[0027] As a result, as shown in Figure 11, even if the earth pressure P in the radial direction r from the ground side toward the excavation hole side acts on the earth retaining member 200 and the vertically adjacent horizontal flanges 203 are displaced relative to each other in the radial direction r of the excavation hole, the fastening portion 4 is fastened to the opening edge of the connecting hole 203a before the end edge 203b of the horizontal flange 203 comes out of the insertion portion 30 of the connecting fitting 100. Therefore, the insertion portion 2 does not come out of the connecting hole 203a, and the connected state of the vertically adjacent horizontal flanges 203 can be maintained.

[0028] Embodiment 2. Next, the connecting fitting 101 according to this second embodiment will be described with reference to Figures 13 and 14. Figure 13 is a side view showing the connecting fitting 101 according to this second embodiment. Note that components identical to those of the connecting fitting 100 described in the first embodiment are denoted by the same reference numerals, and their descriptions are omitted as appropriate.

[0029] As shown in Figure 13, in the connecting fitting 101 according to Embodiment 2, the latching portion 5 is formed as a protrusion that extends from the stepped portion 20 toward the other end edge 11 of the connecting fitting body 1 which is provided with the clamping portion 3. As an example, the latching portion 5 is made of steel material of the same material as the connecting fitting 101 and attached to the stepped portion 20 by welding or the like. The latching portion 5 may be inclined toward the direction away from the connecting fitting body 1 so that it can be latched onto the opening edge of the connecting hole 203a. In addition, the size and shape of the latching portion 5 are such that they do not interfere with the insertion of the insertion portion 2 into the connecting hole 203a. Furthermore, the latching portion 5 is formed by appropriately changing the shape according to the plate thickness of the horizontal flange 203 and the hole diameter of the connecting hole 203a.

[0030] Figure 14 is a side view showing a modified example of the connecting fitting 101 according to this second embodiment. The latching portion 6 shown in Figure 14 is formed by cutting and raising a part of the stepped portion 20 toward the other end edge 11 side of the connecting fitting body portion 1 which is provided with the clamping portion 3. The latching portion 6 may be inclined toward the direction away from the connecting fitting body portion 1 so that it can be latched onto the opening edge of the connecting hole 203a. Furthermore, the size and shape of the latching portion 6 are such that they do not interfere with the insertion of the insertion portion 2 into the connecting hole 203a. In addition, the latching portion 6 is formed by appropriately changing the shape according to the plate thickness of the horizontal flange 203 and the hole diameter of the connecting hole 203a.

[0031] Note that the convex latching portions 5 and 6 are not limited to the configurations shown in Figures 13 and 14. The convex latching portions 5 and 6 may take any other form as long as they are configured to latch onto the opening edge of the connecting hole 203a when the connected adjacent lateral flanges 203 are displaced relative to each other in the radial direction of the excavated hole.

[0032] Although the connecting fittings 100 and 101 have been described above based on the embodiments, the connecting fittings 100 and 101 are not limited to the configuration of the embodiments described above. For example, the connecting fittings 100 and 101 are not limited to the components described above and may include other components. Also, the shapes of the connecting fitting body 1, insertion part 2, and clamping part 3 are not limited to the above configuration and may be other shapes. In short, the connecting fittings 100 and 101 include the range of design changes and application variations that are normally performed by those skilled in the art, as long as they do not deviate from the technical concept. [Explanation of symbols]

[0033] 1 Connecting fitting body, 1a, 1b Side edge, 2 Insertion part, 2a Tip, 3 Clamping part, 3a Tip, 4, 5, 6 Hooking part, 10 One edge, 11 Other edge, 12 Protrusion, 20 Stepped part, 30 Insertion part, 100, 101 Connecting fitting, 200 Earth retaining member, 201 Corrugated steel plate, 202 Vertical flange, 202a Connecting hole, 203 Horizontal flange, 203a Connecting hole, 203b Edge, 300 Earth retaining structure, 301 Structure.

Claims

1. A connecting fitting is provided for arranging multiple earth retaining members, each having a flange with a connecting hole formed therein, along the inner wall surface of an excavation hole, and connecting adjacent earth retaining members with their flanges abutted against each other. The main body of the plate-shaped connecting fitting, The connecting fitting body is formed by bending an L-shape from one end edge to one side of the connecting fitting body, and the insertion portion is inserted into the connecting hole formed in the flange, The connecting fitting body is formed by bending a U-shape from the other end edge of the connecting fitting body toward the one side of the connecting fitting body, and includes a clamping portion that clamps the butted ends of the flanges together with the connecting fitting body, The stepped portion connecting the main body of the connecting fitting and the insertion portion is provided with a latching portion that engages with the opening edge of the connecting hole when the adjacent connected flanges are displaced relative to each other in the radial direction of the excavated hole. The aforementioned latching portion is formed by inclining the stepped portion from one end of the connecting fitting body, which is provided with the insertion portion, toward the other end edge of the connecting fitting body, which is provided with the clamping portion.

2. A connecting fitting for arranging a plurality of earth retaining members, each having a flange with a connecting hole formed therein, along the inner wall surface of an excavation hole, and connecting adjacent earth retaining members with their flanges abutted together, The main body of the plate-shaped connecting fitting, The connecting fitting body is formed by bending an L-shape from one end edge to one side of the connecting fitting body, and the insertion portion is inserted into the connecting hole formed in the flange, The connecting fitting body is formed by bending a U-shape from the other end edge of the connecting fitting body toward the one side of the connecting fitting body, and includes a clamping portion that clamps the butted ends of the flanges together with the connecting fitting body, The stepped portion connecting the main body of the connecting fitting and the insertion portion is provided with a latching portion that engages with the opening edge of the connecting hole when the adjacent connected flanges are displaced relative to each other in the radial direction of the excavated hole. The latching portion is formed as a protrusion that extends from the stepped portion toward the other end edge of the connecting fitting body provided with the clamping portion, and is positioned in the stepped portion closer to the insertion portion than the connecting fitting body.

3. The connecting fitting according to claim 2, wherein the latching portion is formed by cutting and raising a part of the stepped portion toward the other end edge of the connecting fitting body portion having the clamping portion.

Images