JP7551511B2 - Connecting fittings - Google Patents

Description

The present invention relates to a connecting fitting for connecting liner plates that have flanges with holes drilled at the top, bottom, left and right ends.

Traditionally, lightweight, manually transportable liner plates have been used to construct bridge piers, abutments, and tower foundations, landslide prevention piles, drainage wells, and shafts for tunneling construction in mountainous areas or in places where heavy machinery cannot be used due to construction conditions. Liner plates are structural components made of thin steel plates corrugated with flanges on all four sides, and in addition to being lightweight, they also have the advantage of being easy to construct as they can be assembled from the inside.

Liner plates are assembled by setting adjacent liner plates so that the bolt holes of the axial flanges are aligned, inserting bolts into the bolt holes of the axial flanges, and tightening the nuts to form a ring. Next, adjacent liner plates are set by aligning the bolt holes of the circumferential flanges, and each ring is connected axially with bolts and nuts, forming a space in the ground.

However, since multiple bolt holes are formed in the axial flange and the circumferential flange, if all of these bolt holes were to be fastened with nuts, it would take a considerable amount of time to assemble the liner plates. Therefore, the technology disclosed in Patent Document 1 and Patent Document 2 has been proposed with the aim of easily connecting liner plates together.

The liner plate connecting hardware disclosed in Patent Document 1 comprises a plate-shaped connecting hardware body, an insertion portion formed by bending one end of the connecting hardware body toward one side of the connecting hardware body into an L-shape, and a clamping portion formed by bending the other end of the connecting hardware body toward one side into a U-shape, with the bent portion of the clamping portion being formed at an angle to the longitudinal direction of the connecting hardware body. By connecting liner plates using such connecting hardware, the insertion portion of the connecting hardware body can be inserted into holes formed in overlapping flanges, and then the connecting hardware body can be simply rotated to connect earth retaining members, etc., to each other, which makes it easier and quicker to connect earth retaining members, etc., to each other than with bolts and nuts.

The liner plate connecting hardware disclosed in Patent Document 2 comprises a plate-shaped connecting hardware body, an insertion portion formed at one end of the connecting hardware body, and a clamping portion formed by bending the other end of the connecting hardware body into a U-shape, with the bent portion of the clamping portion formed at a right angle to the insertion direction of the connecting hardware body into the hole formed in the overlapping flange. By connecting liner plates using such connecting hardware, it is possible to connect retaining members, etc. to each other simply by inserting the insertion portion of the connecting hardware body into the hole formed in the overlapping flange, so that it is easier and faster to connect retaining members, etc. to each other than with bolts and nuts.

The connecting fittings disclosed in Patent Documents 1 and 2 are fittings for connecting two plates (such as liner plates used for retaining walls, etc.) to each other, and instead of the conventional fastening work using bolts, the connecting fittings are inserted into bolt holes and fastened with a single touch. Both fittings consist of an insertion part that is inserted into a hole formed in the flange, and a clamping part that holds the two abutted flanges together. By connecting liner plates using such connecting fittings, it is possible to reduce the time required for tedious bolt tightening work.

JP 2020-2634 A JP 2020-2635 A

However, in the connecting fitting 140 disclosed in Patent Document 1, since the insertion portion 102 is L-shaped, when the lower flange 122L is shifted radially inward (to the left in the figure) relative to the upper flange 122U as shown in Figure 11(b) from a state in which there is no shift between the upper and lower flanges 122U, 122L of the liner plate in the circumferential flange as shown in Figure 11(a), the insertion portion 102 of the connecting fitting 140 disclosed in Patent Document 1 deforms obliquely, causing the connecting fitting 140 to become detached. Also, the connecting fitting 140 disclosed in Patent Document 2 has an inclined insertion portion 102 to begin with, causing the connecting fitting 140 to become detached in a similar manner. In this case, if the connecting fitting 140 disclosed in Patent Documents 1 and 2 is attached to the flange upside down, it will be less likely to come off, but the lower flange 122L will not necessarily shift radially inward (to the left in the figure) relative to the upper flange 122U, and may shift radially outward (in the opposite direction to the arrow in the figure) depending on conditions such as the earth pressure acting on the wall body 1. In this case, even if the connecting fitting 140 is attached upside down, it will be attached in a direction that will cause it to come off, and this problem cannot be solved.

The present invention was devised in consideration of the above-mentioned problems, and its purpose is to provide a connecting fitting that will not come loose in any direction and will prevent the flanges from slipping apart even when a shear force or the like acts between the flanges of connected liner plates.

To solve the above-mentioned problems, the inventors invented a connecting fitting that includes a flat main body, an insertion portion that curves downward out of the plane at one end of the main body and has a first opening, and a clamping portion that curves downward out of the plane at the other end of the main body and has a second opening that faces the first opening.

The connecting fitting of the first invention is a connecting fitting for connecting the flanges of liner plates when connecting the liner plates having flanges at the top, bottom, left and right ends with a plurality of holes drilled therein, and is characterized in having a flat main body portion, an insertion portion having a width narrower than the main body portion and capable of being inserted into the hole, and a clamping portion having a gripping portion at the other end side that is curved downward in the out -of-plane direction relative to the flat surface of the main body portion and folded back , having a return piece that is spaced apart from the main body portion and faces the other end, and a first opening that opens toward the other end side of the main body portion in the opposing space between the main body portion and the return piece, and a second opening that opens toward the one end side and faces the first opening in the opposing space between the main body portion and the gripping portion.

The connecting fitting according to the second invention is the same as the first invention, in which the clamping portion has a first bent portion formed with a fold and a second bent portion that is continuous with the first bent portion and curves in a direction away from the main body portion, and the second bent portion is provided with a gripping portion that grips the flange.

The connecting fitting according to the third invention is the first or second invention, characterized in that the insertion portion is bent twice to form a substantially U-shaped cross section.

According to the present invention having the above-mentioned configuration, a connecting fitting including a flat body portion, an insertion portion that is curved downward in the out-of-plane direction at one end side of the body portion and has a first opening, and a clamping portion that is curved downward in the out-of-plane direction at the other end side of the body portion and has a second opening facing the first opening is inserted into at least some of the holes of the plurality of holes, and the clamping portion is rotated around the insertion portion to connect the liner plates. As a result, even if a shear force or separation force occurs between the flanges, the engagement portion suppresses the movement of the flanges in the radial direction and the separation direction, so that it is possible to prevent misalignment and opening between the two flanges.

FIG. 1 is a perspective view showing a wall constructed by connecting liner plates together using connecting fittings to which the present invention is applied. FIG. 2(a) is a perspective view showing a liner plate used in the liner plate connecting method, and FIG. 2(b) is a plan view thereof. FIG. 3(a) is a perspective view showing a first modified example of a liner plate used in the method for connecting liner plates, and FIG. 3(b) is a plan view thereof. FIG. 4(a) is a perspective view showing a second modified example of a liner plate used in the liner plate connecting method, and FIG. 4(b) is a plan view thereof. FIG. 5(a) is a side view showing a temporary fastener having a movable part used in a method for connecting liner plates, and FIG. 5(b) is a plan view thereof. FIG. 6(a) is a perspective view of a connecting fitting in the embodiment, FIG. 6(b) is a plan view thereof, and FIG. 6(c) is a side view thereof. FIG. 7 is a front view showing a state in which the positions of the liner plates are held by temporary fasteners. FIG. 8 is a diagram showing a state in which the positions of the liner plates are held by connecting fittings. 9(a) and (b) are schematic diagrams showing a state in which a connecting fitting in an embodiment is attached to a liner plate. 10A and 10B are diagrams illustrating a state in which a radial shear force acts between circumferential flanges of liner plates in the embodiment. 11(a) and 11(b) are diagrams showing a state where a radial shear force acts between circumferential flanges of a liner plate in a conventional structure.

Below, we will explain in detail how to implement a connecting fitting to which the present invention is applied, with reference to the drawings.

Figure 1 shows a wall 1 constructed by connecting the flanges of liner plates together using connecting fittings 40. The connecting fittings 40 are used when excavating the ground to construct the wall 1 to resist earth pressure from the excavation surface.

The holes 22a, 23a formed in the flanges are connected to the flange ends using the connecting fittings 40 to which the present invention is applied, and multiple liner plates 20 are connected in the vertical and circumferential directions to construct a shaft 100 consisting of a cylindrical wall body 1. The wall body 1 is installed in a hole formed underground and is used as a retaining wall when constructing deep foundation piles, drainage wells, bridge piers, etc.

The liner plate 20 is, for example, a steel plate, and has a corrugated steel plate 21 formed into a corrugated shape in the vertical direction as shown in FIG. 2, and flanges at the upper end, lower end, and left and right ends of the corrugated steel plate 21. The flanges at the upper and lower ends of the corrugated steel plate 21 of the liner plate 20 are circumferential flanges 22, and the flanges at the left and right ends of the corrugated steel plate 21 are axial flanges 23. The liner plate 20 is not limited to being made of steel, and may be made of any material as long as it has the strength to resist earth pressure from the excavation surface of the ground.

The circumferential flange 22 has multiple holes 22a with a diameter d1 (e.g., 21 mm). As shown in FIG. 1, the circumferential flange 22 has connecting fittings 40 inserted into the holes 22a. The axial flange 23 is made of a rectangular steel plate, has multiple circular holes 23a drilled into it, and the connecting fittings 40 are inserted into the holes 23a.

The liner plate 20, which is used to connect the circumferential plates in a circular arc shape in plan view, is formed in a fan shape in plan view, as shown in Figures 2(a) and 2(b). In this case, the circumferential flange 22 is made of a steel plate that is fan-shaped in plan view and has a thickness sufficient to withstand a certain earth pressure.

The circumferential flange 22 has a central axis W in the width direction (radial direction), which is the short side direction, that extends in an arc shape, and multiple holes 22a are drilled, for example, on the central axis W or at a position close to the inner end.

When the central axis M of the holes 22a of the circumferential flange 22 is taken as the distance P1 between the central axes M and M of adjacent holes 22a, 22a, the distance P1 is approximately equal to each other. In other words, the multiple holes 22a are arranged at equal intervals on the circumferential flange 22.

The liner plate 20 may be formed in a rectangular shape in plan view, as shown in Figures 3(a) and 3(b). In this case, the circumferential flange 22 is made of a steel plate that is rectangular in plan view and has a thickness sufficient to withstand a predetermined earth pressure, and is arranged to separate the earth side (outside) from the shaft side (inside). The circumferential flange 22 has a central axis W in the width direction that extends linearly, and a plurality of holes 22a are arranged at equal intervals on the central axis W or at a position close to the inner end.

As shown in Figures 4(a) and 4(b), the liner plates 20 may be L-shaped in plan view by connecting rectangular liner plates to each other via connecting members 29 such as angle irons. In this case, the circumferential flanges 22 each have a central axis W in the width direction that extends linearly, and a plurality of holes 22a are arranged at equal intervals on each central axis W or at a position close to the inner end.

The wall body 1 is constructed by connecting the axial flanges 23, 23 of laterally adjacent liner plates 20, 20 to each other via connecting fittings 40 to form an annular liner plate connection body 2, and arranging the liner plate connection bodies 2 in multiple stages in the vertical direction. The wall body 1 is constructed such that the position of the axial flange 23 of the liner plate 20 in the liner plate connection body 2 provided in the upper stage and the position of the axial flange 23 of the liner plate 20 in the liner plate connection body 2 provided in the lower stage are mutually offset in the circumferential direction.

In addition, the wall body 1 is illustrated in FIG. 1 as being formed in a circular shape when viewed from above, but this is not limited thereto, and it may be formed in an oval shape or a rectangular shape when viewed from above, etc.

In the method of connecting liner plates, the circumferential flanges 22 are temporarily fastened together using a temporary fastener (temporary fastening member) 3, and then are finally fastened together with a connecting metal fitting 40. That is, before the process of finally fastening the circumferential flanges 22 together with the connecting metal fitting 40 (final fastening process), a process of temporarily fastening the circumferential flanges 22 together by inserting the temporary fastener 3 into some of the holes 22a drilled in the circumferential flanges 22 of one liner plate 20 and the other liner plate 20 (temporary fastening process) is performed. Therefore, first, the temporary fastener 3 will be described. FIG. 5(a) shows a side view of the temporary fastener 3, and FIG. 5(b) shows a plan view thereof.

As shown in FIG. 5(a), the temporary fastener 3 has a plate-shaped base 31, an insertion portion 32 extending substantially perpendicularly from the base 31, and a holding mechanism 30 provided on the insertion portion 32. The holding mechanism 30 has an engagement portion 33, which has a movable portion 33a. Note that, although the temporary fastener 3 in the illustrated embodiment has the holding mechanism 30 provided on the insertion portion 32, the temporary fastener 3 used in the present invention may have the holding mechanism 30 provided on either or both of the base 31 and the insertion portion 32.

As shown in FIG. 5(b), the base 31 is, for example, a metal plate material having an outer diameter that is circular in plan view. The base 31 is formed in a ring shape with a hole 31d formed in the center. Note that the outer shape of the base 31 is not limited to a circular shape in plan view, and may be formed into an angular shape in plan view, etc.

As shown in FIG. 5(a), the insertion portion 32 is made of metal, for example, and is formed into a cylindrical shape with an outer diameter D1 (for example, 16 mm). The end of the insertion portion 32 is inserted into the hole 31d of the base 31 and fixed by welding on the back surface 31b side of the base 31. Although not shown in the figure, the hole 31d of the base 31 may be omitted from the temporary fastener 3, and in this case, the end of the insertion portion 32 may be fixed to the surface 31a of the base 31 by welding or the like.

The insertion section 32 is integrally provided with an engagement section 33 that protrudes laterally from the tip side. The insertion section 32 has a metal plate-shaped movable section 33a disposed in a slit 32b formed on the side of the tip side.

The movable part 33a is connected to the insertion part 32 via the shaft 32a arranged on the tip side of the insertion part 32. The movable part 33a is provided on the insertion part 32 away from the base part 31. The movable part 33a is provided on the insertion part 32 so as to protrude laterally from the insertion part 32 and incline so that the protruding length K1 from the insertion part 32 increases as it moves from the tip side of the insertion part 32 toward the base part 31 side. The movable part 33a is freely protruding from the insertion part 32 in the direction of the arrow Q in the figure, centered on the shaft 32a. In other words, the movable part 33a protrudes from the insertion part 32 when no external force is acting, and can move to the inside of the insertion part 32 when an external force is acting so that part or all of the movable part 33a is accommodated inside the insertion part 32.

Next, the connecting fitting 40 used to connect the liner plates 20 will be described. Figures 6(a) to 6(c) show the connecting fitting 40 in an embodiment. Figure 6(a) is a perspective view of the connecting fitting 40, Figure 6(b) is a plan view thereof, and Figure 6(c) is a side view thereof.

The connecting fitting 40 is formed, for example, by bending a plate-like member such as a single steel plate. The connecting fitting 40 has a flat body portion 50, an insertion portion 60 provided at one end of the body portion 50, and a clamping portion 70 provided at the other end of the body portion 50. The connecting fitting 40 is configured, for example, to be large enough for an operator to hold it with one hand. The connecting fitting 40 is not limited to a steel plate, and may be configured to be elastically deformable using a material that has the strength and durability to withstand the shear force and separation force generated between the circumferential flange 22 or the axial flange 23 (hereinafter also simply referred to as "flange 22"). In addition, the connecting fitting 40 may be integrated by joining the body portion 50, insertion portion 60, and clamping portion 70, which are formed as separate bodies, by, for example, welding.

The insertion portion 60 is folded twice to form a cross section that is roughly U-shaped. Specifically, the insertion portion 60 is bent 180 degrees at one end of the main body portion 50 toward the lower side D in the out-of-plane direction, forming a first opening 60a. As shown in FIG. 6(a), the insertion portion 60 is provided on the front side in the insertion direction, and the first opening 60a that opens to the rear side in the insertion direction is formed. As shown in FIG. 6(b), the insertion portion 60 has a width narrower than the main body portion 50, and is large enough to be inserted into the hole 22a.

As shown in Figs. 6(a) and (c), the insert portion 60 has a return piece 61 on the front side in the insertion direction. The return piece 61 extends in the opposite direction to the insertion direction so as to grip the flange 22. The return piece 61 is provided to prevent the insert portion 60 from coming off the hole 22a provided in the flange 22. Note that the insert portion 60 is not limited to a substantially U-shaped cross section, and may have any shape such as a U-shape or C-shape, so long as it has a shape that can hold the flange 22 on the hole 22a side.

The clamping portion 70 is curved downward D in the out-of-plane direction at the other end side of the main body portion 50, and a second opening 70a is formed opposite the first opening 60a. Specifically, as shown in FIG. 6(a), the clamping portion 70 is provided on the rear side in the insertion direction, and a second opening 70a is formed that opens to the front side in the insertion direction. The clamping portion 70 may have any shape such as a substantially U-shaped cross section, a U-shaped cross section, or a C-shaped cross section, so long as it is shaped to sandwich the flange 22. However, as described later, it is preferable that a second bent portion 72 is formed that is curved in a direction away from the main body portion 50.

6(a) and (c), the clamping portion 70 has a first bent portion 71 with a fold formed thereon, and a second bent portion 72 that is continuous with the first bent portion 71 and curves away from the main body portion 50. The second bent portion 72 is provided with a gripping portion 72a that grips the flange 22. The gripping portion 72a is formed in a shape that is convex toward the main body portion 50, and grips the end side of the circumferential flange 22 by applying a pressing force from the lower D side in the out-of-plane direction toward the upper E side in the out-of-plane direction. Therefore, even if a shear force acts between the flanges 22, the misalignment between the two flanges 22 can be restrained. The second bent portion 72 may be formed to expand downward as it moves away from the first bent portion 71.

It is also preferable to use spring steel for at least the clamping portion 70. When spring steel is used for the clamping portion 70, the gripping force with which the connecting fitting 40 grips the flange 22 can be improved and safety can be ensured when using the liner plate connection body 2. Furthermore, since the connecting fitting 40 has spring properties, it can return to its original shape even if it is deformed, so that the connecting fitting 40 can be used repeatedly. Note that, for example, SWRS material or SUP material can be used as the spring steel.
<Temporary fixing process>

Next, a method of connecting the liner plates 20 in the vertical and circumferential directions using the connecting fittings 40 will be described. When connecting the liner plates 20, first, as shown in FIG. 7, the axial flanges 23 are connected to each other in advance by the connecting fittings 40, and the circumferential flanges 22 are temporarily fixed to each other by attaching the temporary fasteners 3 to the circumferential flanges 22 of the liner plates 20. Specifically, as shown in FIG. 7, the insertion portion 32 of the temporary fastener 3 is inserted into the hole 22a of the circumferential flanges 22, and the movable portion 33a of the engagement portion 33 protruding laterally from the insertion portion 32 is configured to contact the hole 22a of the circumferential flanges 22. Note that the circumferential flanges 22 can also be temporarily fixed to each other by attaching the temporary fasteners 3 to the circumferential flanges 22 when the axial flanges 23 are not connected to each other by the connecting fittings 40.

7, by inserting the insertion portion 32 into each of the holes 22a, 22a, the holes 22a, 22a other than the hole 22a, 22a are also aligned. In other words, by inserting the insertion portion 32 into each of the holes 22a, 22a, the central axes M, M of the holes 22a, 22a into which the insertion portion 32 is not inserted can be aligned.
<Shaft adjustment process>

After the alignment of the holes 22a, 22a drilled in the circumferential flanges 22 in the temporary fixing process is completed, the shape of the shaft 100 formed by the temporarily fixed circumferential flanges 22 is adjusted. When connecting the liner plates 20 to each other, a temporary fastener 3 having a small dimension is used for the hole 22a of the circumferential flanges 22, so a misalignment may occur between the circumferential flanges 22 into which the temporary fastener 3 is inserted. If a misalignment occurs between the circumferential flanges 22, the planned dimensions of the shaft 100 cannot be obtained, so the shape of the shaft 100 is adjusted after the alignment of the holes 22a, 22a.
<Temporary fastening process>

After adjusting the shape of the shaft 100 in the shaft adjustment process, the circumferential flanges 22 that have been temporarily fastened by the temporary fasteners 3 are temporarily fastened together (in the direction of the arrow in FIG. 7) by, for example, bolting them together. By going through the temporary fastening process, the gap between the circumferential flanges 22 is reduced or eliminated, making it easier to start the final fastening.

In this way, by going through three processes, the temporary fastening process using the temporary fasteners 3, the shaft adjustment process, and the temporary tightening process, the liner plates 20 are positioned in advance and temporarily fixed so that they do not fall over, so that the final tightening work can be started safely and accurately even if the worker is not supporting the liner plates 20.

In addition, the temporary fastening step, the shaft adjustment step, and the temporary fastening step do not require the use of the temporary fasteners 3. Specifically, the temporary fastening of the circumferential flanges 22 to each other, the adjustment of the shaft 100, and the temporary fastening of the circumferential flanges 22 to each other can be performed manually by an operator without using the temporary fasteners 3. Therefore, for example, if the liner plates 20 can be safely connected to each other by hand, the temporary fastening step, the shaft adjustment step, and the temporary fastening step may be performed without using the temporary fasteners 3.
<Final tightening process>

Next, the circumferential flanges 22 are finally fastened together. In this final fastening process, the circumferential flanges 22 having gaps are connected together by inserting and rotating the connecting fittings 40 into the holes 22a in which the temporary fasteners 3 are not inserted, among the multiple holes 22a in the circumferential flanges 22. The connecting fittings 40 may be inserted and rotated into all the holes 22a, or the liner plates 20 may be connected together by inserting bolts into some of the holes 22a. By using the connecting fittings 40 in combination with the bolts, the liner plates 20 can be connected together more firmly than when only the connecting fittings 40 are used.

Figure 8 is a diagram showing the state in which the liner plates 20 are held together by the connecting fittings 40. As shown in Figure 8, when the final tightening process is completed, the liner plates 20 are connected together by the connecting fittings 40. Figure 8 shows an example in which the connecting fittings 40 are inserted into all of the holes 22a, but it is not necessary to insert the connecting fittings 40 into all of the holes 22a, and it is sufficient if the connecting fittings 40 are connected to some of the holes 22a. If the ratio of the connecting fittings 40 inserted to the total number of holes 22a (the ratio of holes 22a into which the connecting fittings 40 are inserted) increases, the strength of the connection between the liner plates 20 can be increased accordingly, compared to when nothing is installed in the holes 22a.

9(a) and (b) are diagrams showing the state in which the connecting fitting 40 is attached to the liner plate 20. The connecting fitting 40 is attached across the hole 22a of the circumferential flange 22 and the radial inner end 22b. The radial distance F between the hole 22a of the circumferential flange 22 and the radial inner end 22b is smaller than the length (radial length when connected) L1 when the connecting fitting 40 is attached to the liner plate 20 and viewed from the side, and is larger than the radial separation distance L2 between the return piece 61 and the second bent portion 72. That is, as shown in FIG. 9(a), the portion between the hole 22a of the circumferential flange 22 and the radial inner end 22b is covered by the connecting fitting 40. To connect the liner plates 20 together, the connecting fitting 40 with the insertion portion 60 inserted into the hole 22a is struck with a striking tool such as a hammer and rotated in the direction of the arrow in the figure. Note that Lmax in the figure indicates the maximum length of the connecting fitting 40.

As shown in FIG. 9(b), the portion between the hole 22a and the radially inner end 22b of the circumferential flange 22 is held by the insertion portion 60 and the gripping portion 72a while being accommodated in the first opening 60a and the second opening 70a. Since the connecting fitting 40 is formed to be elastically deformable, the gripping portion 72a applies a pressing force to the liner plate 20 toward the main body portion 50, and the connecting fitting 40 is fixed to the liner plate 20. Note that in FIG. 9(b), the connecting fitting 40 may be attached to the liner plate 20 upside down, and the attachment direction of the connecting fitting 40 is not limited.

10(a) and (b) are diagrams showing the relationship between the circumferential flange 22 and the connecting fitting 40 when a shear force is applied to the circumferential flange 22. When a shear force is applied to the circumferential flange 22, the lower circumferential flange (lower flange) 22L is shifted radially inward or outward relative to the upper circumferential flange (upper flange) 22U. As shown in FIG. 10(a), when a shear force acts radially inward (laterally) on the lower flange 22L and shifts radially inward (left side in the figure), the lower flange 22L is gripped by the insertion portion 60, thereby preventing the connecting fitting 40 from coming off the circumferential flange 22. Also, as shown in FIG. 10(b), when a radially outward (lateral) shear force acts on the lower flange 22L and displaces it radially outward (to the right in the figure), the lower flange 22L is gripped by the clamping portion 70, preventing the connecting fitting 40 from coming off the circumferential flange 22. Even if the lower flange 22L displaces radially inward or outward relative to the upper flange 22U, the connecting fitting 40 suppresses the movement of the upper flange 22U or the lower flange 22L, thereby preventing significant displacement.

In this way, even if the liner plate connecting body 2 assembled with the liner plates 20 is subjected to biased pressure or the like and a shear force acts between the flanges 22, the insertion part 60 and the clamping part 70, which are folded back to have a substantially U-shaped cross section, restrain the misalignment between the two flanges 22, so that the connecting fitting 40 can be prevented from coming off the liner plate 20. In particular, even if the misalignment between the two flanges 22 differs, the connecting fitting 40 is unlikely to come off the liner plate 20 because the insertion part 60 and the clamping part 70 are both folded back to have a substantially U-shaped cross section. In addition, the connecting work is completed simply by engaging the return piece 61 of the insertion part 60 with the edge of the hole 22a and rotating the clamping part 70 around the insertion part 60, so that the construction can be easily performed by hitting with a hammer or the like, and the construction period can be shortened. Furthermore, the connecting fitting 40 can be formed simply by bending the plate member in a plane, so that the manufacturing cost can be reduced.

According to this embodiment, when connecting liner plates 20 having flanges 22, 23 with multiple holes 22a, 23a at the top, bottom, left and right ends, a connecting fitting 40 for connecting the flanges 22 of the liner plates 20 includes a flat body 50, an insertion portion 60 curved toward the lower D side in the out-of-plane direction at one end of the body 50 and having a first opening 60a, and a clamping portion 70 curved toward the lower D side in the out-of-plane direction at the other end of the body 50 and having a second opening 70a facing the first opening 60a. The insertion portion 60 of the connecting fitting 40 having such a configuration is inserted into at least some of the holes 22a of the multiple holes 22a, and the clamping portion 70 is rotated around the insertion portion 60 to connect the liner plates 20. As a result, even if a biased pressure or the like acts on the liner plate connecting body 2 assembled with the liner plates 20, and a shear force acts between the flanges 22, the insertion part 60 and the clamping part 70, which are folded back to form a roughly U-shaped cross section, restrain the misalignment between the two flanges 22. Therefore, the connecting fitting 40 can be prevented from coming off the liner plate 20, ensuring the safety of the worker.

In addition, the connection work can be completed simply by engaging the return piece 61 of the insertion part 60 with the hole 22a and rotating the clamping part 70 around the insertion part 60, so construction can be easily performed by hitting with a hammer or the like, and construction time can be shortened. Furthermore, since the connecting fitting 40 can be formed by bending a single flat plate-shaped member, the connecting fitting 40 can be manufactured at low cost and with a small number of processing steps.

In addition, according to this embodiment, the clamping portion 70 has a first bent portion 71 with a fold formed thereon, and a second bent portion 72 that is provided continuously with the first bent portion 71 and curved in a direction away from the main body portion 50, and the second bent portion 72 is provided with a gripping portion 72a that grips the flange. The gripping portion 72a tightly grips the flange 22, thereby increasing the fastening force between the flanges 22 and suppressing deformation of the entire liner plate connection body 2. In addition, the connecting fitting 40 inserted into the flange 22 is less likely to slip, and the connecting fitting 40 is prevented from rotating in the reverse direction around the insertion portion 60 and coming off the flange 22, ensuring safety when using the liner plate connection body 2. Furthermore, since the second bent portion 72 is formed to expand downward as it moves away from the first bent portion 71, even if there is a gap between the flanges 22 before fastening, the connecting fitting 40 is easily connected, improving workability.

In addition, according to this embodiment, the insertion portion 60 is folded twice to form a cross section that is approximately U-shaped. At this time, although not shown, by providing a fold like the second fold 72 of the clamping portion 70 on the return piece 61, the insertion portion 60 can tightly grip the flange 22, increasing the fastening force between the flanges 22 and suppressing deformation of the entire liner plate connector 2. In addition, the connecting fitting 40 inserted into the flange 22 is less likely to slip, and the connecting fitting 40 is prevented from rotating in the reverse direction around the insertion portion 60 and coming off the flange 22, ensuring safety when using the liner plate connector 2.

The above provides a detailed explanation of the connecting fitting 40 in an embodiment of the present invention, but the above-mentioned and illustrated embodiments are merely examples of specific embodiments for carrying out the present invention. Therefore, the technical scope of the present invention should not be interpreted as being limited by the above-mentioned embodiments.

1 wall body 2 liner plate connecting body 20 liner plate 21 corrugated steel plate 22 circumferential flange 22a hole 22b inner end 22L lower flange 22U upper flange 23 axial flange 23a hole 29 connecting material 3 temporary fastener 30 holding mechanism 31 base 31a surface 31b back surface 31d hole 32 insertion portion 32a shaft 32b slit 33 engagement portion 33a movable portion 40 connecting fitting 50 main body 60 insertion portion 60a first opening 61 return piece 70 clamping portion 70a second opening 71 first bent portion 72 second bent portion 72a gripping portion 100 vertical shaft 102 insertion portion 122L lower flange 122U upper flange 140 connecting fitting D out-of-plane downward D1 outer diameter d1 diameter E out-of-plane upward F Radial distance L1 Total length L2 Separation distance M Center axis P1 Separation distance W Center axis

Claims (3)

A connecting fitting for connecting the flanges of liner plates having flanges with a plurality of holes at the upper and lower ends and the left and right ends, comprising:
a connecting fitting comprising: a flat main body portion; an insertion portion having a width narrower than that of the main body portion and capable of being inserted into the hole, the insertion portion having a width narrower than that of the main body portion and capable of being inserted into the hole, the clamping portion having a gripping portion at the other end side curved downward in the out-of-plane direction with respect to the flat surface of the main body portion and folded back, the insertion portion having a return piece that is curved downward in the out-of-plane direction with respect to the flat surface of the main body portion at one end side and folded back to face away from the main body portion, the insertion portion having a width narrower than that of the main body portion and capable of being inserted into the hole, and a clamping portion having a gripping portion that is curved downward in the out-of-plane direction at the other end side and folded back to face away from the main body portion, the clamping portion having a second opening that opens toward the one end side in the facing space between the main body portion and the gripping portion. 2. The connecting fitting according to claim 1, wherein the clamping portion has a first bent portion formed with a fold and a second bent portion that is continuous with the first bent portion and curved in a direction away from the main body portion, and a gripping portion that grips the flange is provided on the second bent portion. 3. The connecting fitting according to claim 1 or 2, wherein the insertion portion is bent twice to have a substantially U-shaped cross section.

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