Corrugated sheet interlocking structure

Abstract

To provide a corrugated board connecting fitting which enables multiple corrugated boards to be bound by work conducted from one surface side when the corrugated boards are connected.SOLUTION: A corrugated board connecting fitting connects corrugated boards overlapped with each other and includes: a shaft part which may be inserted into a through hole formed at each corrugated board and extends linearly; and an engagement part which may be inserted into the through hole and extends from one end of the shaft part in a direction intersecting a center axis of the shaft part. The shaft part includes a fixing part larger than the through hole at the other end. The fixing part and the engagement part are bound with the corrugated boards sandwiched therebetween. A tip of the engagement part is located at the other end side relative to a terminal at one end side of a linear portion of the shaft part.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to structure corrugated plate connection.

Background Art

[0002] Conventionally, when constructing a water channel disclosed in, for example, Patent Document 1, the water channel is configured by connecting a plurality of corrugated plates each having a wavy cross-sectional shape. Two corrugated plates arranged adjacent to each other are superimposed such that their waveforms are aligned in the same phase, a bolt is passed through a through hole provided at the top of the waveform, and a nut is screwed onto the bolt to tighten and connect the two plates.

[0003] The plurality of corrugated plates have the same cross-sectional structure, and are connected not only in the parallel direction of the wavy corrugations (for example, the direction in which the water channel extends) but also in the extending direction of the wavy corrugations (the direction perpendicular to the cross-section where the corrugations of the corrugated plate appear). At this time, there are cases where a bolt is inserted into a through hole provided in the convex portion of the waveform top, and cases where a bolt is inserted into a through hole provided in the concave portion. In either case, the tightening work is performed by screwing a nut onto the inserted bolt from the back side of the corrugated plate. However, when connecting a plurality of corrugated plates by overlapping them and using bolts and nuts, it is necessary for an operator on one side of the corrugated plate to insert the bolt, and another operator on the other side to screw the nut onto the bolt. Alternatively, when connecting corrugated plates by a single operator, it is necessary to first perform the work of inserting the bolt on one side of the corrugated plate, then move to the other side to perform the work of screwing the nut. That is, a single operator cannot perform the bolt insertion work and the nut screwing work at the same time. Alternatively, it is necessary to arrange operators on each of the front and back sides of the corrugated plate.

[0004] In contrast, the one-side tightening fastening device disclosed in Patent Document 2 uses an L-shaped bolt, which allows the L-shaped bolt to be inserted from the side where the nut is screwed into the bolt holes provided in the two steel plates to be fastened, and the nut tightening work can be performed from the insertion side. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2021-071041 [Patent Document 2] Japanese Utility Model Publication No. 5-3621 [Overview of the project] [Problems that the invention aims to solve]

[0006] However, the single-sided fastening device disclosed in Patent Document 2 had a problem in that when the non-threaded end of the L-shaped bolt was located on the convex side of the corrugated plate, the contact area between the L-shaped bolt and the corrugated plate was small, and it took a long time to fasten it (until the required tightening torque was achieved).

[0007] Furthermore, when tightening a single-sided fastening device from one side of a corrugated plate, especially when the non-threaded end is located on the convex side of the corrugation, there was a problem in that the L-shaped bolt would rotate when attempting to tighten the nut because there was no structure to catch it, making it impossible to tighten the nut. Therefore, when single-sided fastening devices were placed and connected at each peak of the corrugation, it was necessary to hold the nut from the back side to prevent it from rotating while tightening. In this case, work had to be done from the back side of the surface where the nut was located, which presented a problem in that, for example, when fastening corrugated steel plates that make up a waterway, the work had to be done from the outside of the waterway.

[0008] This invention solves the above problems and provides a corrugated sheet connector that allows multiple corrugated sheets to be fastened by working from one side. structure The purpose is to provide. [Means for solving the problem]

[0009] Corrugated plate connection according to the present invention structure teeth, Multiple corrugated sheets, overlapping Multiple of the aboveCorrugated sheet connecting hardware for joining corrugated sheets Corrugated sheet connecting structure comprising And, Each of the multiple corrugated plates has a through hole formed in it, and the corrugated plate connecting fitting is, before Kikan It comprises a shaft portion that is insertable into a through hole and extends in a straight line, and a locking portion that is insertable into the through hole and extends from one end of the shaft portion in a direction intersecting the central axis of the shaft portion, wherein the shaft portion has a fixing portion at the other end that is larger than the through hole, and the fixing portion and the locking portion are, multiple The corrugated plate is sandwiched between the two parts and fastened together, and the locking portion is positioned such that its tip is closer to the other end than the end of one end of the straight portion of the shaft. Furthermore, the diameter of the through-hole is 1.2 times or more and less than 2 times the outer diameter of the shaft portion. That is the case. [Effects of the Invention]

[0010] According to the present invention, since the locking portion catches on the back side of the corrugated sheet, the worker only needs to perform the installation of the fixing portion from one side, eliminating the need to work from the back side. Furthermore, even when the corrugated sheet connecting fitting is installed by inserting it into a through hole at the bottom of the corrugation of the corrugated sheet, the inclined locking portion on the back side catches on the surface near the peak of the corrugation, preventing rotation, so the worker can install the corrugated sheet connecting fitting by working only from the front side. [Brief explanation of the drawing]

[0011] [Figure 1] This is a perspective view of the connecting portion 100 of the corrugated plates 1a and 1b according to Embodiment 1. [Figure 2] This is a front view of the connecting portion 100 of the corrugated plates 1a and 1b according to Embodiment 1. [Figure 3] This is an explanatory diagram of the corrugated plate connecting fitting 10a installed in the recess of the connecting portion 100 according to Embodiment 1. [Figure 4] This is an explanatory diagram of the corrugated plate connecting fitting 10a installed on the protruding portion of the connecting portion 100 according to Embodiment 1. [Figure 5] This is an explanatory diagram of the first washer 13 of the corrugated sheet connecting fitting 10 according to Embodiment 1. [Figure 6] This is an explanatory diagram of the second washer 14 of the corrugated sheet connecting fitting 10 according to Embodiment 1. [Figure 7] It is a cross-sectional view of the connecting portion 100 according to Embodiment 1. [Figure 8] It is a cross-sectional view of the connecting portion 100 according to Embodiment 1. [Figure 9] It is a cross-sectional view of the corrugated plate connecting fitting 110 according to a comparative example. [Figure 10] It is an explanatory diagram of Modification 1 of the corrugated plate connecting fitting 10 according to Embodiment 1. [Figure 11] It is an explanatory diagram of the tip end 12c of the locking portion 12b when viewed from the viewpoint of arrow C in FIG. 10. [Figure 12] It is an explanatory diagram of Modification 2 of the corrugated plate connecting fitting 10 according to Embodiment 1. [Figure 13] It is an explanatory diagram of Modification 3 of the corrugated plate connecting fitting 10 according to Embodiment 1. [Figure 14] It is an explanatory diagram of Modification 4 of the corrugated plate connecting fitting 10 according to Embodiment 1. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing, the same or corresponding parts are denoted by the same reference symbols, and the description thereof is omitted or simplified as appropriate. Furthermore, the shape, size, arrangement, and the like of the configurations described in each drawing can be appropriately changed within the scope of the present invention. In addition, to facilitate understanding, terms indicating directions (for example, up, down, left, right, and the like) are used as appropriate; however, these notations are provided for convenience of description, and do not limit the arrangement, direction, and orientation of each member and each part of the structure.

[0013] Embodiment 1. Figure 1 is a perspective view of the connecting portion 100 of corrugated plates 1a and 1b according to Embodiment 1. Figure 2 is a front view of the connecting portion 100 of corrugated plates 1a and 1b according to Embodiment 1. In Figures 1 and 2, the x-direction is the parallel direction of the corrugations of the corrugated plate 1, and the y-direction is the direction of extension of the corrugations. The z-direction is the direction in which the plate surface of the corrugated plate 1 faces. The corrugated plate 1 is a steel plate whose cross-sectional shape is, for example, a sine wave-shaped corrugation extending in the x-direction, and whose cross-sectional shape extends in the y-direction. Such a corrugated plate 1 is a corrugated steel plate used as a component to form, for example, the bottom and sides of a waterway with a U-shaped cross-section, the wall surface of a tubular waterway, and the wall surface of a bin that stores materials inside. For example, when installing corrugated plates 1 that constitute a waterway, multiple corrugated plates 1 are arranged in a circular pipe shape or a roughly U-shape in a trench dug in the ground. Then, the worker connects the connecting parts 100 of the multiple corrugated plates 1 provided on the side of the waterway from the inside of the waterway using corrugated plate connecting fittings 10. Note that the material of the corrugated plates 1 is not limited to steel plates, but other metals or resins can be used. The surface of the corrugated plates 1 may be treated with a surface treatment such as plating.

[0014] Corrugated plates 1a and 1b are superimposed with their wave phases aligned and connected using a corrugated plate connecting fitting 10. The corrugated plate connecting fitting 10 consists of an L-shaped bolt 12 with a male threaded portion 12s onto which a nut 11 is screwed. A first washer 13, a second washer 14, and corrugated plates 1a and 1b are sandwiched between the locking portion 12b of the L-shaped bolt 12 and the nut 11, thereby connecting the two corrugated plates 1a and 1b.

[0015] Corrugated plates 1a and 1b have through holes 2 (see Figure 7) in the tops 5 of the corrugations, and are overlapped with the positions of the through holes 2 aligned. The L-shaped bolt 12 of the corrugated plate connecting fitting 10 is inserted through the through hole 2 from one side of the corrugated plate 1, and a nut 11 is screwed onto the male threaded portion 12s of the L-shaped bolt 12. A first washer 13 and a second washer 14 are sandwiched between the nut 11 and the corrugated plate 1. When the nut 11 is tightened, the locking portion 12b of the L-shaped bolt 12 comes into contact with the top 5 of the corrugated plate 1a, and the second washer 14 comes into contact with the top 5 of the corrugated plate 1b. The axial force generated by tightening the nut 11 onto the male threaded portion 12s sandwiches and fixes the corrugated plates 1a, 1b, the first washer 13, and the second washer 14 in place. The first washer 13 and the second washer 14 have curved surfaces that conform to the corrugated shape of the corrugated plate 1, and are configured to ensure a wide contact surface with the corrugated plate 1. However, the second washer 14 can be omitted. In Embodiment 1, the first washer 13 has a shape that can accommodate both the convex and concave parts of the corrugated plate 1, so the contact area with the corrugated plate 1 may be small, and it is configured to make contact via the second washer 14. However, if a sufficient contact area can be ensured between the first washer 13 and the corrugated plate 1, the second washer 14 does not need to be used.

[0016] Figure 3 is an explanatory diagram of the corrugated plate connecting fitting 10a installed in the recess of the connecting portion 100 according to Embodiment 1. Figure 4 is an explanatory diagram of the corrugated plate connecting fitting 10a installed in the convex portion of the connecting portion 100 according to Embodiment 1. Figure 5 is an explanatory diagram of the first washer 13 of the corrugated plate connecting fitting 10 according to Embodiment 1. Figure 6 is an explanatory diagram of the second washer 14 of the corrugated plate connecting fitting 10 according to Embodiment 1. The recess and convex portion represent the state as viewed from above in Figure 2, where the lower peak 5a of the corrugated plate 1 is called the recess, and the upper peak 5b is called the convex portion.

[0017] (Washer No. 13) As shown in Figure 5, the first washer 13 has a flat surface 15 facing the nut 11, and the surface 16 facing the corrugated plate 1 has two curved surfaces 16a and 16b. In plan view (see Figure 5(b)), the first washer 13 has a through hole 17 in the center through which an L-shaped bolt 12 is inserted. The surface 16 facing the corrugated plate 1 has a first curved surface 16b that protrudes toward the corrugated plate 1 in the center in a front view (see Figure 5(d)), and a second curved surface 16a that is recessed toward the nut 11 from the corrugated plate 1 in the center in a side view (see Figure 5(c)). In bottom view (see Figure 5(f)), i.e., when viewed from the corrugated plate 1 side, the second curved surface 16a, which is recessed, is positioned closer to the through hole 17 than the first curved surface 16b, which is convex. In other words, the central part of the convex second surface 16a is removed, and the concave first surface 16b is formed. As shown in Figure 5(c), the vertices of the second surface 16a are positioned so as to straddle the side view of the first surface 16b.

[0018] The first curved surface 16b is a part of the columnar surface where the central axis c1 is located on the nut 11 side, and the second curved surface 16a is a part of the columnar surface where the central axis c2 is located on the corrugated plate 1 side. In the plan view shown in Figure 5(b), that is, in the direction of the central axis of the through hole 17, the central axis c1 of the first curved surface 16b is perpendicular to the central axis c2 of the second curved surface 16a. With this configuration, when the end face 13a of the first washer 13 is oriented in the direction of extension of the corrugation of the corrugated plate 1 (y-direction), the first curved surface 16b is positioned to follow the concave part of the corrugation, and when the end face 13b of the first washer 13 is oriented in the direction of extension of the corrugation (y-direction), the second curved surface 16a is positioned to follow the convex part of the corrugation.

[0019] In Embodiment 1, the first washer 13 can accommodate both the concave and convex portions of the corrugated plate 1 by rotating it 90° in a plan view. Note that the central axis c1 of the first curved surface 16b and the central axis c2 of the second curved surface 16a do not need to be strictly orthogonal in a plan view, as long as they intersect, and it is sufficient that the second curved surface 16a is positioned so that the vertices of the first curved surface 16b are not deleted.

[0020] Furthermore, the first washer 13 does not have to have both curved surfaces 16a and 16b; it may have only one of them. If the first washer 13 has only the first curved surface 16b, the area where the second curved surface 16a shown in Figure 5(f) is provided will also be convex like the first curved surface 16b, thus increasing the contact area with the corrugated plate 1. As a result, the corrugated plate connecting fitting 10 can be fastened to the recess of the corrugated plate 1 even without the second washer 14.

[0021] Furthermore, in the case where the first washer 13 has only the second curved surface 16a, the area where the first curved surface 16b shown in Figure 5(f) is provided also becomes a concave surface like the second curved surface 16a, thus increasing the contact area with the corrugated plate 1. As a result, the corrugated plate connecting fitting 10 can be fastened to the convex portion of the corrugated plate 1 even without the second washer 14.

[0022] (Second washer 14) As shown in Figure 6, the second washer 14 is formed such that both the front and back surfaces of the washer are prismatic surfaces, with a substantially uniform thickness throughout. The convex surface 14a of the second washer 14 is a prismatic surface with its central axis c3, and the concave surface 14b is an offset surface from the convex surface 14a.

[0023] An insertion hole 14c is provided in the center of the second washer 14, through which the L-shaped bolt 12 is inserted. The second washer 14 is circular in plan view (see Figure 6(b)), but is not limited to this, and can take other shapes such as rectangles.

[0024] When the corrugated sheet connector 10 is positioned in the recess of the corrugated sheet 1, the convex side 14a of the second washer 14 abuts against the corrugated sheet 1, and the concave side 14b abuts against the first curved surface 16b (convex surface) of the first washer 13. When the nut 11 is tightened, the second washer 14 fits tightly along the shape of the first washer 13 and the recess of the corrugated sheet 1, as shown in the corrugated sheet connector 10a on the left side of Figure 2.

[0025] Figure 7 is a cross-sectional view of the connecting portion 100 according to Embodiment 1. When the corrugated plate connecting fitting 10 is positioned on the convex portion of the corrugated plate 1, the concave side 14b of the second washer 14 abuts against the corrugated plate 1, and the convex side 14a abuts against the second curved surface 16a (concave surface) of the first washer 13. When the nut 11 is tightened, the second washer 14 comes into close contact with the first washer 13 and the shape of the concave portion of the corrugated plate 1, as shown in the corrugated plate connecting fitting 10b on the right side of Figure 2. Note that the second washer 14 can be omitted depending on the form of the first washer 13. In other words, if a sufficient contact area is secured between the first washer 13 and the corrugated plate 1, the corrugated plate connecting fitting 10 does not need to include the second washer 14.

[0026] (Nut 11) The nut 11 of the corrugated plate connecting fitting 10 has one end of a normal nut enlarged, and is configured to increase the contact area with the surface 15 of the first washer 13. The nut 11 is also referred to as the fixing part. The fixing part may use fastening means other than the nut 11.

[0027] (L-shaped bolt 12) Figure 8 is a cross-sectional view of the connecting portion 100 according to Embodiment 1. The cross-section in Figure 8 is a cross-section along the central axis of the L-shaped bolt 12. The L-shaped bolt 12 is formed in an L shape, with a shaft portion 12a extending along the central axis of the through hole 2 of the corrugated plate 1, and a locking portion 12b extending in a direction intersecting it. A male threaded portion 12s is formed at one end of the shaft portion 12a, and the locking portion 12b is connected to the other end. The L-shaped bolt 12 is formed, for example, by bending a single rod-shaped member, and a bent radius portion 12d is formed on the inside of the bends of the shaft portion 12a and the locking portion 12b. The locking portion 12b is inclined toward one end of the shaft portion 12a as it approaches the tip 12c, with respect to the direction perpendicular to the shaft portion 12a. The inclination angle is 1° to 30°, and preferably set to 5° to 15°. In Figure 8, the inclination angle is set to 5°.

[0028] The apex 12f of the tip 12c of the locking portion 12b is the part of the edge of the tip 12c that is closest to the male threaded portion 12s, and it comes into contact with the corrugated plate 1 when the corrugated plate connecting fitting 10a is fastened. Alternatively, as shown in Figure 2, if the locking portion 12b is fastened with a slight twist from the apex of the corrugation, the area around the apex 12f also comes into contact with the corrugated plate 1.

[0029] When the nut 11 is tightened, it rotates clockwise from a top view in Figure 2, and consequently, the locking portion 12b also rotates in the direction of arrow r in Figure 2. At this time, the corrugated plate connecting fitting 10a, which is positioned in the corrugated recess, has its locking portion 12b inclined toward the male thread portion 12s, so the portion around the apex 12f comes into contact with the apex of the corrugation of the corrugated plate 1. This prevents the L-shaped bolt 12 from rotating together with the nut 11 when it is tightened.

[0030] The vertex 12f of the tip 12c of the locking portion 12b is preferably in contact with a virtual plane E, or positioned on the side of the male thread portion 12s, when a virtual plane E is defined that passes through the end 12e of the straight portion of the shaft portion 12a on the locking portion 12b side. In other words, at least a portion of the tip 12c of the locking portion 12b intersects with the virtual plane E that passes through the end 12e of the shaft portion 12a, or has a portion that protrudes toward the corrugated plate 1 side toward the virtual plane E. The shaft portion 12a is perpendicular to its virtual plane E. The end 12e of the shaft portion 12a is the lower end of the straight portion where the male thread portion 12s of the L-shaped bolt 12 is formed, and is also the end of the bent R portion 12d on the shaft portion 12a side. Furthermore, the locking portion 12b of the corrugated plate connecting fitting 10 according to Embodiment 1 is not limited to extending in a straight line, but also includes curved portions, and at least the vertex 12f is in contact with the virtual plane E or is located on the male screw portion 12s side of the virtual plane E.

[0031] Furthermore, it is desirable that the through holes 2a and 2b in the corrugated plate 1 be smaller than twice the outer diameter of the shaft portion 12a of the L-shaped bolt 12. More preferably, the through hole 2 is set to be between 1.2 and 1.5 times the outer diameter of the shaft portion 12a. For example, if the diameter of the L-shaped bolt 12 is 16 mm, the diameter of the through hole 2 is set to 21 mm. This allows the L-shaped bolt 12 to be inserted through the through hole 2, achieving a stable fastening.

[0032] Figure 9 is a cross-sectional view of a corrugated plate connecting fitting 110 according to a comparative example. Since the L-shaped bolt 12 is formed by bending a rod-shaped steel material, a bent radius portion 12d is formed on the inside of the bend, as shown in Figures 8 and 9. Therefore, as shown in Figure 9, when the direction in which the locking portion 12b extends approaches the horizontal, there is a possibility that the bent radius portion 12d and the opening edge 4 of the through hole 2 of the corrugated plate 1 will come into contact. If the bent radius portion 12d and the opening edge 4 of the through hole 2 come into contact before the tip 12c of the locking portion 12b, a load f will be generated in an oblique direction on the shaft portion 12a, which may cause the shaft portion 12a to tilt.

[0033] Furthermore, if the shaft portion 12a is positioned eccentrically with respect to the through hole 2 of the corrugated plate 1, the corrugated plate 1 may be tightly fastened while sandwiched between the bent R portion 12d of the L-shaped bolt 12 and the nut 11, and the corrugated plate connecting fitting 110 may be fastened without the locking portion 12b and tip 12c contacting the corrugated plate 1. In such a case, if an impact is applied to the connecting portion 100 or deformation occurs in the corrugated plate 1, the contact surface between the corrugated plate connecting fitting 110 and the corrugated plate 1 may shift, causing loosening.

[0034] Furthermore, when fastening and securing the corrugated sheet 1 as shown in Figure 2, the corrugated sheet connecting fitting 110 according to the comparative example is in a state where the locking portion 12b and the top portion 5a of the corrugated sheet 1 are in contact, or where the bent R portion 12d as described above is in contact with the opening edge 4 of the through hole 2. When the direction in which the locking portion 12b extends is close to horizontal, as shown in Figure 9, the top portion 12ba of the locking portion 12b and the top portion 5a of the corrugated sheet 1 are almost parallel, making it difficult to maintain the state in which the locking portion 12b and the top portion 5a of the corrugated sheet 1 are in contact. Therefore, even if the locking portion 12b and the top portion 5a of the corrugated sheet 1 can be in contact, when the nut 11 is tightened, the locking portion 12b and the top portion 5a will slide against each other, and the locking portion 12b will rotate together with the rotation of the nut 11 as it is tightened.

[0035] On the other hand, in the case of the corrugated plate connecting fitting 10 according to Embodiment 1, since the locking portion 12b is inclined with respect to the shaft portion 12a, the vertex 12f of the tip 12c of the locking portion 12b is located on the corrugated plate 1 (male screw portion 12s) side of the virtual plane E, so that the locking portion 12b contacts the corrugated plate 1 before the bent R portion 12d. As a result, the corrugated plate connecting fitting 10 can stably connect and fix multiple corrugated plates 1. In particular, since the through hole 2 of the corrugated plate 1 is formed with an inner diameter as close as possible to the outer diameter of the shaft portion 12a, the corrugated plate connecting fitting 10 according to Embodiment 1 is suitable when connecting such corrugated plates 1.

[0036] In the case of the corrugated sheet connecting fitting 10 according to Embodiment 1, when the nut 11 is tightened, the locking portion 12b is inclined with respect to the shaft portion 12a, so the side surface 12j (see Figure 2) of the locking portion 12b, which is offset from the apex 12f of the tip 12c, catches on the slope around the top 5a of the corrugated sheet 1. Therefore, the locking portion 12b and the top 5a do not slip against each other when the nut 11 is tightened.

[0037] (Modification 1 of L-shaped bolt 12) Figure 10 is an explanatory diagram of a modified example 1 of the corrugated plate connecting fitting 10 according to Embodiment 1. Figure 11 is an explanatory diagram of the tip 12c of the locking portion 12b as viewed from the viewpoint of arrow C in Figure 10. The surface 12h of the tip 12c of the locking portion 12b of the corrugated plate connecting fitting 10A according to Modified Example 1, which faces the corrugated plate 1, is formed so as to be perpendicular to the central axis of the shaft portion 12a, at least in a side view. For example, the surface 12h may be a plane substantially perpendicular to the central axis of the shaft portion 12a as shown in Figure 11(a), or it may be a surface with a concave central part as shown in Figure 11(b), or it may be a curved surface with a protruding central part as shown in Figure 11(c).

[0038] In the modified corrugated sheet connecting fitting 10A, as shown in Figure 10, it is preferable that the surface 12h of the tip 12c of the locking portion 12b facing the corrugated sheet 1 is formed so that it is at least partially parallel to the virtual plane E. With this configuration, the contact area between the locking portion 12b and the corrugated sheet 1 is increased in the direction in which the locking portion 12b extends, and the corrugated sheet connecting fitting 10 can stably connect and fix multiple corrugated sheets 1. Also, in Figures 11(a) to (c), the surface 12h is facing upward, but as shown in Figures 11(d) to (f), the surface 12h may be facing diagonally upward.

[0039] Furthermore, it is preferable that surface 12h is located at the same position as the virtual plane E, or on the male screw portion 12s side of the virtual plane E. This makes it easier for surface 12h to come into contact with the corrugated plate 1 before the bent R portion 12d.

[0040] (Modified example 2 of L-shaped bolt 12) Figure 12 is an explanatory diagram of a modified example 2 of the corrugated sheet connecting fitting 10 according to Embodiment 1. The tip 12c of the locking portion 12b of the corrugated sheet connecting fitting 10B according to Modified Example 2 is provided with a projection 12k that protrudes toward the corrugated sheet 1. The projection 12k is provided by forming a recess 12g on the side facing the corrugated sheet 1 between the tip 12c of the locking portion 12b and the end connected to the shaft portion 12a. The recess 12g has a surface 12m that is perpendicular to the central axis of the shaft portion 12a, at least in a side view. For example, the surface 12m may be formed in the same way as the surface 12h as shown in Figures 11(a) to (f) in the DD cross section in Figure 12.

[0041] The protruding portion 12k of the corrugated sheet connecting fitting 10B in Modified Example 2 can increase the amount of engagement with the top 5a of the corrugated sheet 1 when installed in the corrugated recess as shown in the corrugated sheet connecting fitting 10a in Figure 2. Therefore, when the corrugated sheet connecting fitting 10B is fastened, the rotation of the nut 11 and the L-shaped bolt 12 together can be suppressed. In addition, since the surface 12m of the recess 12g is formed in the same way as the surface 12h of Modified Example 1, the contact area between the locking portion 12b and the corrugated sheet 1 is increased, and the protruding portion 12k catches on the top 5a of the corrugated sheet 1, so that multiple corrugated sheets 1 can be stably connected and fixed.

[0042] (Modified example 3 of L-shaped bolt 12) Figure 13 is an explanatory diagram of a third modified example of the corrugated sheet metal connector 10 according to Embodiment 1. The locking portion 12b of the corrugated sheet metal connector 10C according to the third modified example extends in a direction perpendicular to the shaft portion 12a and may have a projection 12k at its tip 12c that protrudes toward the corrugated sheet metal 1. In this case, the vertex 12f of the projection 12k is in contact with the virtual plane E or protrudes toward the male screw portion 12s. Even with this shape, the locking portion 12b contacts the corrugated sheet metal 1 before the bent R portion 12d at the projection 12k, and the projection 12k catches on the peak 5a of the corrugation.

[0043] (Modification 4 of L-shaped bolt 12) Figure 14 is an explanatory diagram of a modified example 4 of the corrugated sheet connecting fitting 10 according to Embodiment 1. The locking portion 12b of the corrugated sheet connecting fitting 10D according to Modified Example 4 is not limited to a straight shape, but extends in a curved direction intersecting the shaft portion 12a. The tip 12c of the locking portion 12b has at least its apex 12f located at the same position as the end 12e of the shaft portion 12a or on the side of the male threaded portion 12s in a side view. In a side view, the locking portion 12b is formed to extend diagonally downward from the bent R portion 12d toward the center, and diagonally upward from the center toward the tip 12c. With this configuration, the bent R portion 12d is formed to be substantially large, avoiding contact between the opening edge 4 of the through hole 2 of the corrugated sheet 1 and the L-shaped bolt 12, and because the apex 12f is located on the side of the male threaded portion 12s, the tip 12c catches on the top of the corrugation 5a of the corrugated sheet 1. Furthermore, the closer the direction extending from the central part toward the tip 12c is to parallel with the shaft part 12a, the easier it is for the tip 12c to catch on the peak 5a of the wave of the corrugated plate 1.

[0044] Although the present invention has been described above based on embodiments, the present invention is not limited to the configurations described in the embodiments. In particular, the combination of components is not limited to the combinations in the embodiments and can be changed as appropriate. Furthermore, it should be noted that the scope of the gist (technical scope) of the present invention also includes various modifications, applications, and uses that a person skilled in the art may make as needed.

[0045] The corrugated sheet connecting fitting 10 described above may also include combinations of the features shown in the following appendices 1 to 10. These combinations are shown below.

[0046] [Note 1] A corrugated sheet connecting fitting for connecting overlapping corrugated sheets, A shaft portion that extends in a straight line and can be inserted into a through hole formed in the corrugated plate, It is insertable into the through hole and comprises a locking portion that extends from one end of the shaft portion in a direction intersecting the central axis of the shaft portion, The aforementioned shaft portion is The other end is provided with a fixing portion larger than the through hole, The fixing portion and the locking portion are, The corrugated plate is sandwiched in between and fastened together. The aforementioned locking portion is, A corrugated plate connecting fitting in which the tip is located on the other end side of the straight portion of the shaft, rather than on the other end side. [Note 2] The aforementioned shaft portion is A male threaded portion is formed at the other end. The aforementioned fixing part is a nut that screws onto the male threaded part, as described in Appendix 1, for the corrugated plate connecting fitting. [Note 3] The aforementioned fixing part is This includes a washer that is sandwiched between the nut and the corrugated plate, The aforementioned washer is, The surface facing the nut has a flat surface, The surface facing the corrugated plate has a first curved surface whose center protrudes toward the corrugated plate, and a second curved surface whose center is recessed toward the nut toward the corrugated plate, An insertion hole is formed in the central part through which the shaft portion is inserted. The second surface is, A corrugated plate connecting fitting as described in Appendix 2, provided on the insertion hole side of the first curved surface. [Note 4] The first surface is, The central axis is a part of the columnar surface located on the nut side, The second surface is, The central axis is a part of the columnar surface located on the corrugated plate side, In view of the central axis direction of the insertion hole, the central axis of the first curved surface is, The corrugated plate connecting fitting described in Appendix 3 intersects with the central axis of the second curved surface. [Note 5] The aforementioned locking portion is, A corrugated plate connecting fitting described in any one of the appendices 1 to 4, which extends inclined toward the other end of the shaft portion as it approaches the tip. [Note 6] The direction of extension of the locking portion is, A corrugated plate connecting fitting as described in Appendix 5, which forms an angle of 1° to 30° with respect to a direction perpendicular to the central axis of the aforementioned shaft portion. [Note 7] The aforementioned locking portion is, A corrugated plate connecting fitting as described in any one of the appendices 1 to 6, having a protrusion at its tip that projects toward the corrugated plate. [Note 8] The aforementioned locking portion is, A corrugated plate connecting fitting according to any one of the appendices 1 to 7, wherein a recess is formed on the surface facing the corrugated plate between the tip and the end connected to the shaft portion. [Note 9] The surface of the recess facing the corrugated plate is A corrugated plate connecting fitting as described in Appendix 8, having a portion perpendicular to the central axis of the shaft portion in a side view. [Note 10] The surface of the tip of the locking portion facing the corrugated plate is, A corrugated plate connecting fitting as described in any one of the appendices 1 to 6, having a portion perpendicular to the central axis of the shaft portion in a side view. [Explanation of Symbols]

[0047] 1 Corrugated sheet, 1a Corrugated sheet, 1b Corrugated sheet, 2 Through hole, 2a Through hole, 2b Through hole, 4 Opening edge, 5 Top, 5a Top, 5b Top, 10 Corrugated sheet connecting fitting, 10A Corrugated sheet connecting fitting, 10B Corrugated sheet connecting fitting, 10C Corrugated sheet connecting fitting, 10D Corrugated sheet connecting fitting, 10a Corrugated sheet connecting fitting, 10b Corrugated sheet connecting fitting, 11 Nut, 12 L-shaped bolt, 12a Shaft, 12b Locking part, 12ba Top, 12c Tip, 12d Bent R part, 12e End, 12f Vertex, 12g Recess, 12h Face, 12j Side, 12k Protrusion, 12m Face, 12s Male thread part, 13 First washer, 13a End face, 13b End face, 14 second washer, 14a face, 14b face, 14c through hole, 15 face, 16 face, 16a second curved surface, 16b first curved surface, 17 through hole, 100 connecting part, 110 corrugated plate connecting fitting, E virtual plane, c1 central axis, c2 central axis.

Claims

1. A plurality of corrugated plates, A corrugated sheet connecting structure comprising a corrugated sheet connecting fitting for connecting a plurality of overlapping corrugated sheets, Each of the multiple corrugated plates has a through hole formed in it. The aforementioned corrugated sheet connecting fitting is A shaft portion that can be inserted into the aforementioned through hole and extends in a straight line, It is insertable into the through hole and comprises a locking portion that extends from one end of the shaft portion in a direction intersecting the central axis of the shaft portion, The aforementioned shaft portion is The other end is provided with a fixing portion larger than the through hole, The fixing portion and the locking portion are, Multiple corrugated plates are fastened together with one in between. The aforementioned locking portion is, The tip of the straight portion of the shaft is located closer to the other end than the end of one end. A corrugated plate connecting structure wherein the diameter of the through hole is 1.2 times or more and less than 2 times the outer diameter of the shaft portion.

2. The aforementioned shaft portion is A male threaded portion is formed at the other end. The corrugated plate connecting structure according to claim 1, wherein the fixing part is a nut that is screwed onto the male threaded part.

3. The aforementioned fixing part is This includes a washer that is sandwiched between the nut and the corrugated plate, The aforementioned washer is, The surface facing the nut has a flat surface, The surface facing the corrugated plate has a first curved surface whose center protrudes toward the corrugated plate, and a second curved surface whose center is recessed toward the nut toward the corrugated plate, An insertion hole is formed in the central part through which the shaft portion is inserted. The second surface is, The corrugated plate connecting structure according to claim 2, provided on the insertion hole side of the first curved surface.

4. The first surface is, The central axis is a part of the columnar surface located on the nut side, The second surface is, The central axis is a part of the columnar surface located on the corrugated plate side, In view of the central axis direction of the insertion hole, the central axis of the first curved surface is, The corrugated plate connecting structure according to claim 3, which intersects with the central axis of the second curved surface.

5. The aforementioned locking portion is, A corrugated plate connecting structure according to any one of claims 1 to 4, wherein the corrugated plate extends inclined toward the other end of the shaft portion as it approaches the tip.

6. The direction of extension of the locking portion is, The corrugated plate connecting structure according to claim 5, wherein the angle is 1° to 30° with respect to a direction perpendicular to the central axis of the shaft portion.

7. The aforementioned locking portion is A corrugated plate connecting structure according to any one of claims 1 to 4, wherein the tip has a protrusion that projects toward the corrugated plate.

8. The aforementioned locking portion is, A corrugated plate connecting structure according to any one of claims 1 to 4, wherein a recess is formed on the surface facing the corrugated plate between the tip and the end connected to the shaft portion.

9. The surface of the recess facing the corrugated plate is The corrugated plate connecting structure according to claim 8, wherein in a side view, it has a portion that is perpendicular to the central axis of the shaft portion.

10. The surface of the tip of the locking portion facing the corrugated plate is, A corrugated plate connecting structure according to any one of claims 1 to 4, wherein in a side view, it has a portion perpendicular to the central axis of the shaft portion.

11. The surface of the tip of the locking portion facing the corrugated plate is, The corrugated plate connecting structure according to claim 5, wherein in a side view, it has a portion that is perpendicular to the central axis of the shaft portion.

Images