Temporary fastening jig and temporary fastening method

Abstract

This invention provides a temporary fastening jig that reduces the amount of excavation required to connect liner plates and facilitates temporary fastening. [Solution] The temporary fastening jig 1 according to the embodiment has a lower part 2 and an upper part 3 that are spaced apart from each other and facing each other, and a connecting part 4 that connects the rear end 2b of the lower part 2 and the rear end 3b of the upper part 3, and is formed in a U-shape in cross-section. The lower part 2 has a first projection 22 that is spaced apart from the front end 2a of the lower part 2 and protrudes from the lower body part 21 toward the upper part 3, and the upper part 3 has a second projection 32 that is spaced apart from the front end 3a of the upper part 3 and protrudes from the upper body part 31 toward the lower part 2. The first projection 22 is inserted into the hole 202a of the flange 202 of the lower liner plate 200, and the second projection 32 is inserted into the hole 102a of the flange 102 of the upper liner plate 100.

Description

Technical Field

[0001] The present invention relates to a temporary fixing jig and a temporary fixing method for temporarily fixing a lower liner plate to an upper liner plate among liner plates that are vertically connected and have flanges with a plurality of holes formed therein at the upper and lower ends and the left and right ends.

Background Art

[0002] In order to construct an earth retaining wall in a shaft, liner plates that are vertically and horizontally connected along the wall surface of the shaft are used. The earth retaining wall formed by the liner plates covers the inner wall surface of an excavation hole formed by shallowly excavating the ground surface, and a wall body formed by the uppermost liner plate is installed. Then, a lower liner plate is sequentially connected below the installed upper liner plate so as to cover the inner wall surface of the shaft while excavating the ground surface.

[0003] Conventionally, the method of connecting the lower liner plate to the upper liner plate is that one or more workers hold the lower liner plate in a lifted state, and other workers connect the upper and lower liner plates with fastening fittings. Therefore, a plurality of workers are required, and the number of workers cannot be reduced. Thus, there is a problem that labor saving in construction cannot be achieved. Therefore, a temporary fixing jig for temporarily fixing the lower liner plate to the upper liner plate has been devised.

[0004] In the disclosed technique of Patent Document 1, it has a base portion formed to be larger in diameter than the holes formed in the circumferential flange of the liner plate, an insertion portion provided on the base portion and inserted into the holes, and a holding mechanism provided on the insertion portion. The holding mechanism has a locking portion that can be inserted into the holes, and the insertion portion is inserted into the holes.

[0005] The technology disclosed in Patent Document 1 allows for temporary fastening of the liner plate, enabling installation by a single person. However, in the technology disclosed in Patent Document 1, when temporarily fastening, a jig is placed on the lower liner plate, and the lower liner plate is lifted upwards and temporarily fastened to the upper liner plate. Therefore, space is required to lift the lower liner plate. To create this space, it is necessary to increase the excavation length required for liner plate installation (if the liner plate height is 500 mm, an excavation of 500 mm + α is required). Increasing the excavation length presents the problem of increased risk of ground collapse between excavation and liner plate installation.

[0006] Furthermore, in the technology disclosed in Patent Document 1, when removing it from the liner plate, it was necessary to hold the tip with one hand while retracting the protruding part with the other, which was time-consuming. In addition, there were many structurally mechanical parts, such as the inclusion of a spring to retract the protruding part, which resulted in high costs.

[0007] On the other hand, Patent Document 2 discloses a jig for connecting liner plates to prevent misalignment. In the technology disclosed in Patent Document 2, the main body has a pair of first walls arranged facing each other and a second wall connecting the first walls, and the locking portion has a first locking portion and a second locking portion that protrude from the respective ends of the pair of first walls in a direction approaching each other and facing each other.

[0008] In the technology disclosed in Patent Document 2, with the flanges in contact with each other, the first locking portion and the second locking portion, which are positioned at the tip of the first wall, are locked into the holes in the flanges. This allows the liner plates to be connected without any misalignment between the flanges. On the other hand, since the first wall is not positioned radially outward from the holes in the flanges of the liner plates, the area of ​​the first wall that contacts the flanges is small, and there is a concern that the flanges may separate when used as temporary fasteners. [Prior art documents] [Patent Documents]

[0009] [Patent Document 1] Japanese Patent Publication No. 2018-188866 [Patent Document 2] Japanese Patent Publication No. 2021-134479 [Overview of the project] [Problems that the invention aims to solve]

[0010] This invention has been made in view of the above circumstances, and its purpose is to provide a temporary fastening jig and temporary fastening method that can reduce the length of ground excavation required to connect liner plates and facilitate the temporary fastening of the lower liner plate to the upper liner plate. [Means for solving the problem]

[0011] The temporary fastening jig according to the present invention is a temporary fastening jig for temporarily fastening a lower liner plate to an upper liner plate among liner plates connected vertically, each having flanges with a plurality of holes at its upper and lower ends and left and right ends, the jig having a lower and upper part that are spaced apart from each other and facing each other, and a connecting part that connects the rear end of the lower part and the rear end of the upper part, and is formed in a U-shape in cross-section, the lower part has a first projection that is spaced apart from the front end of the lower part and protrudes from the lower body toward the upper part, the upper part has a second projection that is spaced apart from the front end of the upper part and protrudes from the upper body toward the lower part, the first projection is inserted into the hole of the flange of the lower liner plate, and the second projection is inserted into the hole of the flange of the upper liner plate.

[0012] The temporary fastening method according to the present invention is a method for temporarily fastening a lower liner plate to an upper liner plate using a temporary fastening jig according to the present invention, and is characterized by comprising: a first insertion step of inserting the first projection into the hole of the flange of the lower liner plate; and a second insertion step of moving the temporary fastening jig forward and inserting the second projection into the hole of the flange of the upper liner plate.

[0013] The temporary fastening jig according to the present invention is a temporary fastening jig for temporarily fastening a lower liner plate to an upper liner plate among liner plates connected vertically, each having flanges with a plurality of holes drilled in them at its upper and lower ends and left and right ends, the temporary fastening jig having a lower and upper part that are spaced apart from each other and facing each other, and a connecting part that connects the rear end of the lower part and the rear end of the upper part, and being formed in a U-shape in cross-section, the upper part having a second projection that is spaced apart from the front end of the upper part and protrudes from the upper body toward the lower part, and the second projection is inserted into the holes of the flange of the upper liner plate.

[0014] The temporary fastening method according to the present invention is a temporary fastening method for temporarily fastening a lower liner plate to an upper liner plate using a temporary fastening jig according to the present invention, and is characterized by comprising: a first insertion step of bringing the lower main body into contact with the lower surface of the flange of the lower liner plate; and a second insertion step of moving the temporary fastening jig forward and inserting the second projection into the hole in the flange of the upper liner plate.

[0015] The temporary fastening jig according to the present invention is a temporary fastening jig for temporarily fastening a lower liner plate to an upper liner plate among liner plates connected vertically, each having flanges with a plurality of holes drilled in them at its upper and lower ends and left and right ends, and having a lower part and an upper part that are spaced apart from each other and facing each other, and a connecting part that connects the rear end of the lower part and the rear end of the upper part, and is formed in a U-shape in cross-section, the lower part has a first projection that is spaced apart from the front end of the lower part and protrudes from the lower body toward the upper part, and the first projection is inserted into the holes of the flange of the lower liner plate.

[0016] The temporary fastening method according to the present invention is a temporary fastening method for temporarily fastening a lower liner plate to an upper liner plate using a temporary fastening jig according to the present invention, and is characterized by comprising: a first insertion step of inserting the first projection into the hole of the flange of the lower liner plate; and a second insertion step of moving the temporary fastening jig forward to bring the upper body portion into contact with the upper surface of the flange of the upper liner plate. [Effects of the Invention]

[0017] According to the present invention, the lower part has a first projection that is spaced apart from the front end of the lower part and protrudes upward from the lower main body, and the upper part has a second projection that is spaced apart from the front end of the upper part and protrudes downward from the upper main body. The first projection is inserted into a hole in the flange of the lower liner plate, and the second projection is inserted into a hole in the flange of the upper liner plate. This allows the temporary fastening jig, with the first projection inserted into the hole in the flange of the lower liner plate, to be moved forward and the second projection to be inserted into the hole in the flange. This eliminates the need to lift the liner plate upward when temporarily fastening, as in the conventional method, thus reducing the excavation length of the ground required to connect the liner plates. As a result, the ground can be excavated more safely.

[0018] According to the present invention, the first projection is spaced apart from the lower front end, and the second projection is spaced apart from the upper front end. As a result, when the first projection and the second projection are inserted into the holes of the flange, the lower front end and the upper front end are positioned on the front side, radially outward from the flange hole. Therefore, the area in contact between the lower and upper parts and the flange is increased. In other words, the flange can be supported over a wide area from the tip (front side) to the back (rear side) of the U-shaped temporary fastening jig, thus suppressing the separation of the flanges when temporarily fastened.

[0019] According to the present invention, the temporary fastening jig can be moved forward and the second projection can be inserted into the hole in the flange, making it easy to temporarily fasten the lower liner plate to the upper liner plate.

[0020] According to the present invention, the first projection is inserted into a hole in the flange of the lower liner plate, and the second projection is inserted into a hole in the flange of the upper liner plate. The first projection is removed from the hole by fastening the flanges together with bolts. Subsequently, the temporary fastening jig can be removed from the flange by the worker lifting the temporary fastening jig upward by hand to remove the second projection from the hole while moving the temporary fastening jig backward. This makes it easy to remove the temporary fastening jig.

[0021] According to the present invention, the structure is simple with a U-shaped cross-section. Since no springs or other internal components are required, manufacturing becomes easier and costs can be reduced.

[0022] According to the present invention, the upper part has a second protrusion that is separated from the front end part of the upper part and protrudes downward from the upper main body part, and the second protrusion is inserted into the hole of the flange of the upper liner plate. Thereby, the temporary fixing jig in which the upper surface of the lower main body part is brought into contact with the lower surface of the flange of the lower liner plate is moved forward to A, and the second protrusion can be inserted into the hole of the flange. As in the prior art, since it is not necessary to lift the liner plate upward when temporarily fixing, the excavation length of the ground required for connecting the liner plates can be reduced. As a result, the ground can be excavated more safely.

[0023] According to the present invention, the lower part has a first protrusion that is separated from the front end part of the lower part and protrudes upward from the lower main body part, and the first protrusion is inserted into the hole of the flange of the lower liner plate 200. Thereby, the temporary fixing jig in which the first protrusion is inserted into the hole of the flange of the lower liner plate is moved forward, and the lower surface of the upper main body part can be brought into contact with the upper surface of the flange. As in the prior art, since it is not necessary to lift the liner plate upward when temporarily fixing, the excavation length of the ground required for connecting the liner plates can be reduced. As a result, the ground can be excavated more safely.

Brief Description of the Drawings

[0024] [Figure 1] FIG. 1 is a perspective view showing a liner plate temporarily fixed using the temporary fixing jig in the first embodiment. [Figure 2] FIG. 2 is a perspective view showing the temporary fixing jig in the first embodiment. [Figure 3] FIG. 3 is a cross-sectional view showing the temporary fixing jig in the first embodiment. [Figure 4] FIG. 4(a) is a bottom view showing the temporary fixing jig in the first embodiment, and FIG. 4(b) is a plan view showing the temporary fixing jig in the first embodiment. [Figure 5] FIG. 5 is a cross-sectional view showing the first insertion step of the temporary fixing method in the first embodiment. [Figure 6]Figure 6 is a cross-sectional view showing the state in which the guide portion is in contact with the flange of the upper liner plate during the second insertion step of the temporary fastening method in the first embodiment. [Figure 7] Figure 7 is a cross-sectional view showing the state in which the second projection is inserted into the hole in the flange of the upper liner plate during the second insertion step of the temporary fastening method in the first embodiment. [Figure 8] Figure 8 is a cross-sectional view showing the state before the bolts are tightened in the fastening process of the temporary fastening method in the first embodiment. [Figure 9] Figure 9 is a cross-sectional view showing the state after the bolts have been fastened in the fastening process of the temporary fastening method in the first embodiment. [Figure 10] Figure 10 is a perspective view showing a temporary fastening jig in the second embodiment. [Figure 11] Figure 11 is a cross-sectional view showing a temporary fastening jig in the second embodiment. [Figure 12] Figure 12 is a cross-sectional view showing the state in which the second projection is inserted into the hole in the flange of the upper liner plate during the second insertion step of the temporary fastening method in the second embodiment. [Figure 13] Figure 13 is a perspective view showing a temporary fastening jig in the third embodiment. [Figure 14] Figure 14 is a cross-sectional view showing a temporary fastening jig in the third embodiment. [Figure 15] Figure 15 is a cross-sectional view showing the state in which the second projection is inserted into the hole in the flange of the upper liner plate during the second insertion step of the temporary fastening method in the third embodiment. [Figure 16] Figure 16 is a cross-sectional view showing the state in which the upper front end is in contact with the flange of the upper liner plate during the second insertion step of the temporary fastening method in the fourth embodiment. [Figure 17] Figure 17 is a cross-sectional view showing the state in which the second projection is inserted into the hole in the flange of the upper liner plate during the second insertion step of the temporary fastening method in the fourth embodiment. [Figure 18] Figure 18 is a cross-sectional view showing a temporary fastening jig in the fifth embodiment. [Figure 19] Figure 19 is a cross-sectional view showing the state in which liner plates are temporarily fastened together using the temporary fastening jig in the fifth embodiment. [Figure 20] Figure 20 is a cross-sectional view showing a temporary fastening jig in the sixth embodiment. [Figure 21] Figure 21 is a cross-sectional view showing the state in which liner plates are temporarily fastened together using the temporary fastening jig in the sixth embodiment. [Modes for carrying out the invention]

[0025] Some embodiments of this invention will be described below with reference to the drawings.

[0026] (First Embodiment) As shown in Figure 1, the temporary fastening jig 1 is used to temporarily fasten the lower liner plate 200 to the upper liner plate 100 of the upper and lower connected liner plates 100 and 200. The temporary fastening jig 1 is used, for example, to temporarily fasten the liner plates 100 and 200 that make up the retaining wall 10 along the inner wall surface of the shaft when excavating the shaft, in order to connect them in the axial direction of the shaft. The retaining wall 10 is constructed by excavating the shaft from top to bottom and connecting the lower liner plate 200 from below to the upper liner plate 100.

[0027] The upper liner plate 100 has a corrugated sheet portion 101 that is wavy in the vertical direction, flanges 102 formed at the upper and lower ends of the corrugated sheet portion 101, and flanges 103 formed at the left and right ends of the corrugated sheet portion 101. Multiple holes 102a and 103a are drilled in the flanges 102 and 103. The corrugated sheet portion 101 is curved, for example, in an arc shape along its longitudinal direction. The corrugated sheet portion 101 may also be flat.

[0028] The lower liner plate 200 has a corrugated sheet portion 201 that is wavy in the vertical direction, flanges 202 formed at the upper and lower ends of the corrugated sheet portion 201, and flanges 203 formed at the left and right ends of the corrugated sheet portion 201. Multiple holes 202a and 203a are drilled in the flanges 202 and 203. The corrugated sheet portion 201 is curved, for example, in an arc shape along its longitudinal direction. The corrugated sheet portion 201 may also be flat.

[0029] Holes 102a, 202a, 103a, and 203a are holes for inserting bolts to connect adjacent liner plates 100 and 200 to each other.

[0030] As shown in Figures 2 and 3, the temporary fastening jig 1 is formed by bending spring steel to create a U-shaped cross-section. The temporary fastening jig 1 comprises a lower part 2 and an upper part 3 that are spaced apart from each other and facing each other, and a connecting part 4 that connects the rear end 2b of the lower part 2 and the rear end 3b of the upper part 3. For example, spring steel with a thickness of about 1.5 mm is used for the temporary fastening jig 1.

[0031] The lower part 2 is formed in a plate shape. The lower part 2 has a first projection 22 that is spaced apart from the front end 2a of the lower part 2 toward the rear B and protrudes from the lower main body 21 toward the upper part 3.

[0032] The protrusion of the first projection 22 is preferably 1 mm or more. The first projection 22 is formed by cutting and bending the lower main body portion 21 upward. The first projection 22 has a first inclined portion 24 that slopes upward toward the rear B side from the front end 22a of the first projection 22 which is connected to the lower main body portion 21. The rear end 22b of the first projection 22 is spaced apart from the lower main body portion 21.

[0033] The upper part 3 is formed in a plate shape. The upper part 3 has a second projection 32 that is spaced rearward B from the front end 3a of the upper part 3 and protrudes toward the lower part 2 from the upper main body 31. The second projection 32 is opposite to the first projection 22.

[0034] The protrusion of the second projection 32 is preferably 1 mm or more. The second projection 32 is formed by cutting and bending the upper main body portion 31 downward. The second projection 32 has a second inclined portion 34 that slopes downward toward the rear B side from the front end 32a of the second projection 32 which is connected to the upper main body portion 31. The rear end 32b of the second projection 32 is spaced apart from the upper main body portion 31.

[0035] The upper part 3 has a guide portion 33 which is bent upward and inclined on the front A side of the upper main body portion 31.

[0036] As shown in Figure 4(a), the length L22 of the first projection 22 in the front-rear direction is, for example, about 15 mm. The width B22 of the first projection 22 in the width direction is, for example, about 10 mm.

[0037] As shown in Figure 4(b), the length L32 of the second projection 32 in the front-rear direction is, for example, about 19 mm. The width B32 of the second projection 32 in the width direction is, for example, about 5 mm. The width B32 of the second projection 32 is smaller than the width B22 of the first projection 22.

[0038] The reinforcing portion 5 is formed by bending the central part of the width direction of the lower part 2, upper part 3, and connecting part 4 toward the inside of the U-shape. The width of the reinforcing portion 5 in the width direction is, for example, about 22 mm. The reinforcing portion 5 has a reinforcing portion 52 formed on the lower part 2, a reinforcing portion 53 formed on the upper part 3, and a reinforcing portion 54 formed on the connecting part 4. Although not shown in the figures, the reinforcing portion 5 may also be a rib provided on the connecting part 4, for example.

[0039] As shown in Figure 3, the distance D between the lower main body portion 21 and the upper main body portion 31 is, for example, greater than or equal to the sum of the plate thickness of flange 102 and the plate thickness of flange 202, and less than or equal to 36.6 mm.

[0040] Next, an example of a method for temporarily fastening a liner plate using the temporary fastening jig 1 will be described.

[0041] In the temporary fastening method for liner plates, the lower liner plate 200 is temporarily fastened to the upper liner plate 100. The temporary fastening method for liner plates comprises a first insertion step, a second insertion step, a fastening step, and a removal step.

[0042] As shown in Figure 5, in the first insertion step, the upper liner plate 100 is constructed in advance. In the first insertion step, the first projection 22 is inserted into the hole 202a of the flange 202 of the lower liner plate 200. The lower body portion 21 is in contact with the lower surface of the flange 202.

[0043] The first inclined portion 24 is inclined upward toward the rear B side from the front end 22a of the first projection 22 which is connected to the lower main body portion 21. This allows the first projection 22 to be inserted into the hole 202a while sliding the first inclined portion 24 toward the front A side of the flange 202. This makes it easier to insert the first projection 22.

[0044] When the first projection 22 is inserted into the hole 202a, the rear end 22b of the first projection 22 is separated from the lower main body 21. Therefore, even if the temporary fastening jig 1 moves to the rear B side, the rear end 22b is more likely to come into contact with the inner circumferential surface of the hole 202a. As a result, the temporary fastening jig 1 is less likely to come off the flange 202.

[0045] When the first projection 22 is inserted into the hole 202a, the front end 2a of the lower part 2 may be in contact with the corrugated sheet portion 201. In this case, the first projection 22 can be inserted into the hole 202a while guiding the liner plate 200 in the circumferential direction with the front end 2a of the lower part 2 in contact with the corrugated sheet portion 201, making it easier to insert the first projection 22. Alternatively, when the first projection 22 is inserted into the hole 202a, the connecting part 4 may be in contact with the flange 202. In this case, the first projection 22 can be inserted into the hole 202a while guiding the liner plate 200 in the circumferential direction with the connecting part 4 in contact with the flange 202, making it easier to insert the first projection 22.

[0046] Next, as shown in Figure 6, in the second insertion step, the temporary fastening jig 1, with the first projection 22 inserted into the hole 202a, is moved forward A while the guide portion 33 is guided onto the flange 102. The upper main body portion 31 has a guide portion 33 that is inclined upward on the forward A side, which makes it easier to insert the flange 102 into the back side (rear B side) of the U-shape of the temporary fastening jig 1.

[0047] As shown in Figure 7, in the second insertion step, the second projection 32 is inserted into the hole 102a of the flange 102 of the upper liner plate 100. At this time, the upper body portion 31 comes into contact with the upper surface of the flange 102. This allows the lower liner plate 200 to be temporarily fastened to the upper liner plate 100, and the worker can release their hands from the temporary fastening jig 1. When temporarily fastened, the flanges 102 and 202 are separated from each other.

[0048] The second inclined portion 34 is inclined downward toward the rear B side from the front end 32a of the second projection 32 which is connected to the upper main body portion 31. This allows the second projection 32 to be inserted into the hole 102a while sliding the second inclined portion 34 on the flange 102. This makes it easier to insert the second projection 32.

[0049] When the second projection 32 is inserted, the rear end 32b of the second projection 32 is separated from the upper main body 31. Therefore, even if the temporary fastening jig 1 moves to the rear B side, the rear end 32b is more likely to come into contact with the inner circumferential surface of the hole 102a. As a result, the temporary fastening jig 1 is less likely to come off the flange 102.

[0050] When the second projection 32 is inserted into the hole 102a, the front end 3a of the upper part 3 may be in contact with the corrugated sheet portion 101. In this case, the second projection 32 can be inserted into the hole 102a while being guided in the circumferential direction of the liner plate with the front end 3a of the upper part 3 in contact with the corrugated sheet portion 101, making it easier to insert the second projection 32. Also, when the second projection 32 is inserted into the hole 102a, the connecting part 4 may be in contact with the flange 102. In this case, the second projection 32 can be inserted into the hole 102a while being guided in the circumferential direction of the liner plate with the connecting part 4 in contact with the flange 102, making it easier to insert the second projection 32.

[0051] Next, as shown in Figure 8, after the second insertion step, in the fastening step, bolts 81 are inserted into the other holes 202a and 102a adjacent to the holes 202a and 102a into which the first projection 22 and the second projection 32 were inserted.

[0052] The head of the bolt 81 is positioned on the underside of the flange 202, and a washer 83 is placed between the head of the bolt 81 and the flange 202. When temporarily fastened, the tip of the shaft of the bolt 81 protrudes from the washer 84 positioned on the upper surface of the flange 102. This makes it easier to screw the nut 82 onto the shaft of the bolt 81.

[0053] Here, Table 1 below shows an example of the relationship between the plate thickness of liner plates 100 and 200, the length L81 of the bolt 81's shaft, and the distance D between the lower body part 21 and the upper body part 31, which are necessary to ensure a protrusion length of 2 mm for the bolt 81's shaft from the washer 84. The thickness of washer 83 and washer 84 is 3.2 mm. The plate thickness of the spring steel constituting the temporary fastening jig 1 is 1.5 mm, and the amount of inward protrusion of the U-shape due to bending by the reinforcing part 5 is 0.75 mm. In Table 1, LP plate thickness refers to the plate thickness of liner plates 100 and 200. The nominal size of bolt 81 is M16. The unit of length shown in Table 1 is mm.

[0054] [Table 1]

[0055] In the fastening process, the nut 82 is screwed onto the bolt 81 to fasten it. This causes the flange 202 to move upward and come into contact with the flange 102. At this time, as shown in Figure 9, the first projection 22, which was inserted into the hole 202a, is removed from the hole 202a. The second projection 32 remains inserted into the hole 102a.

[0056] In the removal process, after the fastening process, the temporary fastening jig 1 is lifted upward by the worker's hand to remove the second projection 32 from the hole 102a, while the temporary fastening jig 1 is moved to the rear B, thereby removing the temporary fastening jig 1 from the flange 102. After that, bolts 81 are inserted into holes 202a and 102a in order, and nuts 82 are screwed onto the bolts 81 to connect flange 202 and flange 102.

[0057] This completes one example of a method for temporarily fastening a liner plate using the temporary fastening jig 1.

[0058] According to this embodiment, the lower part 2 has a first projection 22 that is spaced apart from the front end 2a of the lower part 2 and protrudes from the lower main body 21 toward the upper part 3, and the upper part 3 has a second projection 32 that is spaced apart from the front end 3a of the upper part 3 and protrudes from the upper main body 31 toward the lower part 2. The first projection 22 is inserted into the hole 202a of the flange 202 of the lower liner plate 200, and the second projection 32 is inserted into the hole 102a of the flange 102 of the upper liner plate 100. As a result, the temporary fastening jig 1 with the first projection 22 inserted into the hole 202a of the flange 202 of the lower liner plate 200 can be moved forward A, and the second projection 32 can be inserted into the hole 102a of the flange 102. Since it is not necessary to lift the liner plate upward when temporarily fastening as in the conventional method, the excavation length of the ground required to connect the liner plates 100 and 200 can be reduced. As a result, the ground can be excavated more safely.

[0059] In this embodiment, the first projection 22 is spaced apart from the front end 2a of the lower part 2, and the second projection 32 is spaced apart from the front end 3a of the upper part 3. As a result, when the first projection 22 and the second projection 32 are inserted into the holes 202a of the flange 202 and the hole 102a of the flange 102, respectively, the front end 2a of the lower part 2 and the front end 3a of the upper part 3 are positioned on the front A side, which is radially outward from the holes 202a of the flange 202 and the hole 102a of the flange 102. Therefore, the area in which the lower part 2 and the upper part 3 contact the flanges 202 and 102 is increased. In other words, the flanges 202 and 102 can be supported over a wide area from the front (front A side) to the back (rear B side) of the U-shaped temporary fastening jig 1, so that when temporarily fastened, the separation of the flanges 202 and 102 can be suppressed.

[0060] According to this embodiment, the temporary fastening jig 1 can be moved forward A, and the second projection 32 can be inserted into the hole 102a of the flange 102, making it easy to temporarily fasten the lower liner plate 200 to the upper liner plate 100.

[0061] Furthermore, the first projection 22 is inserted into the hole 202a of the flange 202 of the lower liner plate 200, and the second projection 32 is inserted into the hole 102a of the flange 102 of the upper liner plate 100. By fastening the flanges 202 and 102 together with bolts 81, the first projection 22 is removed from the hole 202a. Subsequently, the worker can remove the temporary fastening jig 1 from the flange 102 by manually lifting the temporary fastening jig 1 upwards, removing the second projection 32 from the hole 102a, and moving the temporary fastening jig 1 backward B. This makes it easy to remove the temporary fastening jig 1.

[0062] According to this embodiment, the structure is simple with a U-shaped cross-section. Since no springs or other internal components are required, manufacturing becomes easier and costs can be reduced.

[0063] In this embodiment, the protrusion of the first projection 22 is 1 mm or more, and the protrusion of the second projection 32 is 1 mm or more. As a result, the first projection 22 is easily inserted into the hole 202a of the flange 202 of the lower liner plate 200 and is easily in contact with the inner surface of the hole 202a. The second projection 32 is easily inserted into the hole 102a of the flange 102 of the upper liner plate 100 and is easily in contact with the inner surface of the hole 102a.

[0064] According to this embodiment, the distance D between the lower body portion 21 and the upper body portion 31 is 36.6 mm or less. This ensures that when the bolts 81 are placed in the holes 102a and 202a of the temporarily fastened liner plates 100 and 200, a protrusion length of 2 mm of the bolt shaft of the bolt 81 can be secured, making it easier to screw the nut 82 onto the shaft of the bolt 81.

[0065] According to this embodiment, the first inclined portion 24 is inclined upward toward the rear from the front end 22a of the first projection 22 connected to the lower main body portion 21. This allows the first projection 22 to be inserted into the hole 202a while sliding the first inclined portion 24 on the flange 202. This makes it easier to insert the first projection 22.

[0066] According to this embodiment, the rear end 22b of the first projection 22 is spaced apart from the lower main body 21. As a result, when the first projection 22 is inserted into the hole 202a, even if the temporary fastening jig 1 moves to the rear B side, the rear end 22b is more likely to come into contact with the inner circumferential surface of the hole 202a. Therefore, the temporary fastening jig 1 is less likely to come off the flange 202.

[0067] According to this embodiment, the second inclined portion 34 is inclined downward toward the rear B side from the front end 32a of the second projection 32 connected to the upper main body portion 31. This allows the second projection 32 to be inserted into the hole 102a while sliding the second inclined portion 34 on the flange 102. This makes it easier to insert the second projection 32.

[0068] According to this embodiment, the rear end 32b of the second projection 32 is spaced apart from the upper main body 31. As a result, when the second projection 32 is inserted, even if the temporary fastening jig 1 moves to the rear B side, the rear end 32b is more likely to come into contact with the inner circumferential surface of the hole 102a. Therefore, the temporary fastening jig 1 is less likely to come off the flange 102.

[0069] According to this embodiment, the upper part 3 has a guide part 33 on the front A side of the upper main body part 31 which is inclined upward. The first projection 22 moves the temporary fastening jig 1, which is inserted into the hole 202a, forward A while guiding the flange 102 with the guide part 33. This makes it easier to insert the flange 102 into the back side (rear B side) of the U-shape of the temporary fastening jig 1.

[0070] According to this embodiment, the connecting portion 4 has a reinforcing portion 54 that is bent inward towards the U-shape. As a result, when the lower liner plate 200 is temporarily fastened to the upper liner plate 100 using the temporary fastening jig 1, the temporary fastening jig 1 deforms vertically due to the weight of the lower liner plate 200, but the amount of deformation can be suppressed by reinforcing the connecting portion 4. Therefore, safety during temporary fastening can be improved.

[0071] According to this embodiment, the temporary fastening jig 1 is formed by bending spring steel to create a U-shaped cross-section. This makes it possible to suppress residual deformation during temporary fastening, and increases the number of times the temporary fastening jig 1 can be reused. In addition, by bending the spring steel and forming it as a single unit, the manufacturing cost of the temporary fastening jig 1 can be reduced.

[0072] In this embodiment, the width B22 of the first projection 22 is greater than the width B32 of the second projection 32. This prevents the temporary fastening jig 1 from shifting relative to the flange 202 when the first projection 22 is inserted into the hole 202a. Also, because the width B32 of the second projection 32 is small, it becomes easier to insert the second projection 32 into the hole 102a when the first projection 22 is inserted into the hole 202a. As a result, temporary fastening can be made even easier.

[0073] In this invention, the area of ​​the first projection 22 may be larger than the area of ​​the second projection 32. Even in this case, it is possible to suppress the temporary fastening jig 1 from shifting relative to the flange 202 when the first projection 22 is inserted into the hole 202a. Also, because the area of ​​the second projection 32 is small, it becomes easier to insert the second projection 32 into the hole 102a when the first projection 22 is inserted into the hole 202a. As a result, temporary fastening can be made even easier.

[0074] (Second Embodiment) Next, the temporary fastening jig 1 in the second embodiment will be described. Detailed explanations of configurations similar to those in the embodiments described above will be omitted.

[0075] As shown in Figures 10 and 11, in the temporary fastening jig 1 of the second embodiment, the first projection 22 and the second projection 32 are formed in a hemispherical shape.

[0076] The first projection 22 protrudes in a hemispherical shape from the lower main body 21 toward the upper part 3.

[0077] The first projection 22 has a first inclined portion 24 that slopes upward toward the rear B side from the front end 22a of the first projection 22 which is connected to the lower main body 21, and a third inclined portion 25 that slopes upward toward the front A side from the rear end 22b of the first projection 22 which is connected to the lower main body 21. The top 22c of the first projection 22 is connected to the first inclined portion 24 and the third inclined portion 25.

[0078] The second projection 32 protrudes in a hemispherical shape from the upper main body 31 toward the lower part 2.

[0079] The second projection 32 has a second inclined portion 34 that slopes downward toward the rear B side from the front end 32a of the second projection 32 which is connected to the upper main body 31, and a fourth inclined portion 35 that slopes downward toward the front A side from the rear end 32b of the second projection 32 which is connected to the upper main body 31. The top 32c of the second projection 32 is connected to the second inclined portion 34 and the fourth inclined portion 35.

[0080] As shown in Figure 12, in the second insertion step, the second projection 32 is inserted into the hole 102a of the flange 102 of the upper liner plate 100. At this time, the upper main body 31 comes into contact with the upper surface of the flange 102. This allows the lower liner plate 200 to be temporarily fastened to the upper liner plate 100. When temporarily fastened, the flanges 102 and 202 are separated from each other.

[0081] According to this embodiment, the third inclined portion 25 is inclined upward toward the front A side from the rear end 22b of the first projection 22 connected to the lower main body portion 21. As a result, when the temporary fastening jig 1 is moved to the rear B in order to remove the temporary fastening jig 1, the first projection 22 can be removed from the hole 202a while sliding the third inclined portion 25 against the flange 202. Therefore, the removal of the temporary fastening jig 1 becomes easy. Consequently, it also becomes easy to reinstall the temporary fastening jig 1.

[0082] According to this embodiment, the fourth inclined portion 35 is inclined downward toward the front A side from the rear end 32b of the second projection 32 connected to the upper main body portion 31. As a result, when the temporary fastening jig 1 is moved to the rear B in order to remove the temporary fastening jig 1, the second projection 32 can be removed from the hole 102a while sliding the fourth inclined portion 35 against the flange 102. Therefore, the removal of the temporary fastening jig 1 becomes easy. Consequently, it also becomes easy to reinstall the temporary fastening jig 1.

[0083] (Third embodiment) Next, the temporary fastening jig 1 in the third embodiment will be described.

[0084] As shown in Figures 13 and 14, in the temporary fastening jig 1 of the third embodiment, the first projection 22 and the second projection 32 are formed in a V-shape in cross-section.

[0085] The first projection 22 has a first inclined portion 24 and a third inclined portion 25. Both ends of the first projection 22 in the width direction are spaced apart from the lower main body portion 21.

[0086] The second projection 32 has a second inclined portion 34 and a fourth inclined portion 35. Both ends of the second projection 32 in the width direction are spaced apart from the upper main body portion 31.

[0087] As shown in Figure 15, in the second insertion step, the second projection 32 is inserted into the hole 102a of the flange 102 of the upper liner plate 100. At this time, the upper body portion 31 comes into contact with the upper surface of the flange 102. This allows the lower liner plate 200 to be temporarily fastened to the upper liner plate 100. When temporarily fastened, the flanges 102 and 202 are separated from each other.

[0088] According to this embodiment, the third inclined portion 25 is inclined upward toward the front A side from the rear end 22b of the first projection 22 connected to the lower main body portion 21. As a result, when the temporary fastening jig 1 is moved to the rear B in order to remove the temporary fastening jig 1, the first projection 22 can be removed from the hole 202a while sliding the third inclined portion 25 against the flange 202. Therefore, the removal of the temporary fastening jig 1 becomes easy. Consequently, it also becomes easy to reinstall the temporary fastening jig 1.

[0089] According to this embodiment, the fourth inclined portion 35 is inclined downward toward the front A side from the rear end 32b of the second projection 32 connected to the upper main body portion 31. As a result, when the temporary fastening jig 1 is moved to the rear B in order to remove the temporary fastening jig 1, the second projection 32 can be removed from the hole 102a while sliding the fourth inclined portion 35 against the flange 102. Therefore, the removal of the temporary fastening jig 1 becomes easy. Consequently, it also becomes easy to reinstall the temporary fastening jig 1.

[0090] (Fourth Embodiment) Next, the temporary fastening jig 1 in the fourth embodiment will be described.

[0091] As shown in Figures 16 and 17, in the temporary fastening jig 1 of the fourth embodiment, the front end portion 3a of the upper portion 3 is positioned forward A of the front end portion 2a of the lower portion 2. The upper body portion 31 of the upper portion 3, positioned forward A of the second projection 32, is positioned parallel to the lower body portion 21 of the lower portion 2, positioned forward A of the first projection 22.

[0092] As shown in Figure 16, in the second insertion step, the front end 3a of the upper part 3 is temporarily placed on the flange 102, and while guiding the front end 3a of the upper part 3 onto the flange 102, the temporary fastening jig 1, in which the first projection 22 is inserted into the hole 202a, is moved forward A. This makes it easier to insert the flange 102 into the back side (rear B side) of the U-shape of the temporary fastening jig 1.

[0093] As shown in Figure 17, when the second projection 32 is inserted into the hole 102a, the front end 3a of the upper part 3 may come into contact with the corrugated sheet portion 101. In this case, the second projection 32 can be inserted into the hole 102a while being guided in the circumferential direction of the liner plate 100 with the front end 3a of the upper part 3 in contact with the corrugated sheet portion 101, making it easier to insert the second projection 32.

[0094] According to this embodiment, the front end portion 3a of the upper part 3 is positioned forward A than the front end portion 2a of the lower part 2. This allows the front end portion 3a of the upper part 3 to be temporarily placed on the flange 102, and while guiding the front end portion 3a of the upper part 3 onto the flange 102, the temporary fastening jig 1, into which the first projection 22 is inserted, is moved forward A. This makes it easier to insert the flange 102 into the back side (rear B side) of the U-shape of the temporary fastening jig 1.

[0095] (Fifth embodiment) Next, the temporary fastening jig 1 in the fifth embodiment will be described.

[0096] As shown in Figures 18 and 19, in the temporary fastening jig 1 of the fifth embodiment, the first projection 22 is omitted and the second projection 32 is formed. In the lower part 2, the lower main body portion 21 is formed in a continuous shape without localized undulations.

[0097] In this context, the lower main body portion 21 being formed in a continuous shape without localized undulations means that there is no first projection 22 for insertion into the hole 202a. Therefore, even if, for example, a reinforcing portion 52 is formed on the lower part 2 by bending, the lower main body portion 21 is formed in a continuous shape without localized undulations.

[0098] In the temporary fastening method for liner plates, the lower liner plate 200 is temporarily fastened to the upper liner plate 100. The temporary fastening method for liner plates comprises a first insertion step, a second insertion step, a fastening step, and a removal step.

[0099] In the first insertion step, the upper liner plate 100 is constructed in advance. In the first insertion step, the temporary fastening jig 1 is moved forward A and the flange 202 is inserted between the lower part 2 and the upper part 3, and the upper surface of the lower body part 21 is brought into contact with the lower surface of the flange 202 of the lower liner plate 200. The lower body part 21 faces the hole 202a of the flange 202.

[0100] Next, in the second insertion step, the temporary fastening jig 1 is moved forward A so that the flange 102 is inserted between the lower part 2 and the upper part 3. At this time, in the second insertion step, the temporary fastening jig 1, with the lower body part 21 in contact with the lower surface of the flange 202, is moved forward A while the guide part 33 is guided to the flange 102. The upper body part 31 has a guide part 33 that is inclined upward on the forward A side, which makes it easier to insert the flange 102 into the back side (rear B side) of the U-shape of the temporary fastening jig 1.

[0101] In the second insertion step, the second projection 32 is inserted into the hole 102a of the flange 102 of the upper liner plate 100. At this time, the upper main body 31 comes into contact with the upper surface of the flange 102. This allows the lower liner plate 200 to be temporarily fastened to the upper liner plate 100, and the worker can release their hands from the temporary fastening jig 1. When temporarily fastened, the flanges 102 and 202 are separated from each other.

[0102] Since the lower main body portion 21 has a smooth, continuous shape, when inserting the second projection 32 into the hole 102a of the flange 102, the lower main body portion 21 may be brought into contact with the lower surface of the flange 102 and guided in the circumferential direction of the liner plate 200 while inserting the second projection 32 into the hole 102a.

[0103] Next, similar to the embodiment described above, after the second insertion step, in the fastening step, bolts 81 are inserted into the other holes 202a and 102a adjacent to the hole 102a into which the second projection 32 was inserted.

[0104] In the fastening process, the nut 82 is screwed onto the bolt 81 to fasten it. This causes the flange 202 to move upward and come into contact with the flange 102. At this time, the lower main body portion 21, which was in contact with the flange 202, separates from the flange 202. The second projection 32 remains inserted into the hole 102a.

[0105] In the removal process, after the fastening process, the temporary fastening jig 1 is lifted upward by the worker's hand to remove the second projection 32 from the hole 102a, while the temporary fastening jig 1 is moved to the rear B, thereby removing the temporary fastening jig 1 from the flange 102. After that, bolts 81 are inserted into holes 202a and 102a in order, and nuts 82 are screwed onto the bolts 81 to connect flange 202 and flange 102.

[0106] According to this embodiment, the upper part 3 has a second projection 32 that is spaced apart from the front end 3a of the upper part 3 and protrudes from the upper main body 31 toward the lower part 2, and the second projection 32 is inserted into the hole 102a of the flange 102 of the upper liner plate 100. This allows the temporary fastening jig 1, which has the upper surface of the lower main body 21 in contact with the lower surface of the flange 202 of the lower liner plate 200, to be moved forward A, and the second projection 32 can be inserted into the hole 102a of the flange 102. As a result, it is not necessary to lift the liner plate upward when temporarily fastening, as in the conventional method, and the length of excavation required to connect the liner plates 100 and 200 can be reduced.

[0107] According to this embodiment, the second projection 32 is spaced apart from the front end 3a of the upper part 3. As a result, when the second projection 32 is inserted into the hole 102a of the flange 102, the front end 2a of the lower part 2 and the front end 3a of the upper part 3 are positioned on the front A side, which is radially outward from the hole 202a of the flange 202 and the hole 102a of the flange 102. Therefore, the area in which the lower part 2 and the upper part 3 contact the flanges 202 and 102 is increased. In other words, the flanges 202 and 102 can be supported over a wide area from the front (front A side) to the back (rear B side) of the U-shaped temporary fastening jig 1, so that when temporarily fastened, the separation of the flanges 202 and 102 can be suppressed.

[0108] According to this embodiment, the temporary fastening jig 1 can be moved forward A, and the second projection 32 can be inserted into the hole 102a of the flange 102, making it easy to temporarily fasten the lower liner plate 200 to the upper liner plate 100.

[0109] Furthermore, the second projection 32 is inserted into the hole 102a of the flange 102 of the upper liner plate 100. By fastening the flange 202 and flange 102 together with bolts 81, the lower main body 21 is separated from the flange 202. Subsequently, the worker can remove the temporary fastening jig 1 from the flange 102 by manually lifting the temporary fastening jig 1 upwards, removing the second projection 32 from the hole 102a, and moving the temporary fastening jig 1 to the rear B. This makes it easy to remove the temporary fastening jig 1.

[0110] (Sixth Embodiment) Next, the temporary fastening jig 1 in the sixth embodiment will be described.

[0111] As shown in Figures 20 and 21, in the temporary fastening jig 1 of the sixth embodiment, the first projection 22 is formed, and the second projection 32 is omitted. In the upper part 3, the upper main body 31 is formed in a continuous shape without localized undulations.

[0112] In this context, the upper body portion 31 being formed in a continuous shape without localized undulations means that the second projection 32 for insertion into the hole 102a is not present on the upper body portion 31. Therefore, even if, for example, a reinforcing portion 53 is formed on the upper part 3 by bending, or a guide portion 33 is formed, the upper body portion 31 is formed in a continuous shape without localized undulations.

[0113] In the temporary fastening method for liner plates, the lower liner plate 200 is temporarily fastened to the upper liner plate 100. The temporary fastening method for liner plates comprises a first insertion step, a second insertion step, a fastening step, and a removal step.

[0114] In the first insertion step, the upper liner plate 100 is pre-constructed. In the first insertion step, the first projection 22 is inserted into the hole 202a of the flange 202 of the lower liner plate 200. The lower main body 21 is in contact with the lower surface of the flange 202.

[0115] Next, in the second insertion step, the temporary fastening jig 1 is moved forward A and the flange 102 is inserted between the lower part 2 and the upper part 3. At this time, in the second insertion step, the temporary fastening jig 1, with the first projection 22 inserted into the hole 202a, is moved forward A while the guide part 33 guides the flange 102. The upper main body part 31 has a guide part 33 that is inclined upward on the forward A side, which makes it easier to insert the flange 102 into the back side (rear B side) of the U-shape of the temporary fastening jig 1.

[0116] In the second insertion step, the lower surface of the upper body portion 31 is brought into contact with the upper surface of the flange 102 of the upper liner plate 100. At this time, the upper body portion 31 faces the hole 102a of the flange 102. This allows the lower liner plate 200 to be temporarily fastened to the upper liner plate 100, and the worker can release their hands from the temporary fastening jig 1. When temporarily fastened, the flanges 102 and 202 are separated from each other.

[0117] Next, as in the other embodiments described above, after the second insertion step, in the fastening step, bolts 81 are inserted into the other holes 202a and 102a adjacent to the holes 202a and 102a into which the first projection 22 and the second projection 32 were inserted.

[0118] In the fastening process, the nut 82 is screwed onto the bolt 81 to fasten it. This causes the flange 202 to move upward and come into contact with the flange 102. At this time, the first projection 22, which was inserted into the hole 202a, is removed from the hole 202a. The second main body 31 remains in contact with the upper surface of the flange 102.

[0119] In the removal process, since the upper main body 32 has a continuous shape without any undulations after the fastening process, the temporary fastening jig 1 can be removed from the flange 102 by moving the temporary fastening jig 1 to the rear B without having to lift the temporary fastening jig 1 upward by the worker's hand. After that, bolts 81 can be inserted into holes 202a and 102a in order, and nuts 82 can be screwed onto the bolts 81 to connect the flange 202 and the flange 102.

[0120] According to this embodiment, the lower part 2 has a first projection 22 that is spaced apart from the front end 2a of the lower part 2 and protrudes from the lower main body 21 toward the upper part 3, and the first projection 22 is inserted into the hole 202a of the flange 202 of the lower liner plate 200. This allows the temporary fastening jig 1, with the first projection 22 inserted into the hole 202a of the flange 202 of the lower liner plate 200, to be moved forward A, bringing the lower surface of the upper main body 31 into contact with the upper surface of the flange 102. Since it is not necessary to lift the liner plate upward when temporarily fastening, as in the conventional method, the excavation length of the ground required to connect the liner plates 100 and 200 can be reduced. As a result, the ground can be excavated more safely.

[0121] According to this embodiment, the first projection 22 is spaced apart from the front end 2a of the lower part 2. As a result, when the first projection 22 is inserted into the hole 202a of the flange 202, the front end 2a of the lower part 2 and the front end 3a of the upper part 3 are positioned on the front A side, which is radially outward from the hole 202a of the flange 202 and the hole 102a of the flange 102. Therefore, the area in which the lower part 2 and the upper part 3 contact the flanges 202 and 102 is increased. In other words, the flanges 202 and 102 can be supported over a wide area from the front (front A side) to the back (rear B side) of the U-shaped temporary fastening jig 1, so that when temporarily fastened, the separation of the flanges 202 and 102 can be suppressed.

[0122] According to this embodiment, the temporary fastening jig 1 can be moved forward A, allowing the upper main body portion 31 to come into contact with the upper surface of the flange 102, which makes it easier to temporarily fasten the lower liner plate 200 to the upper liner plate 100.

[0123] Furthermore, the first projection 22 is inserted into the hole 202a of the flange 202 of the lower liner plate 200. By fastening the flange 202 and flange 102 with bolts 81, the first projection 22 is removed from the hole 202a. Because the upper main body 31 has a continuous shape without any undulations, the temporary fastening jig 1 can then be removed from the flange 102 by moving the temporary fastening jig 1 to the rear B without the worker having to lift the temporary fastening jig 1 upward by hand. This makes it easy to remove the temporary fastening jig 1.

[0124] In the embodiment described above, an upwardly inclined guide portion 33 is formed on the upper part 3, but in another embodiment, a downwardly inclined guide portion 33 may be formed on the lower part 2.

[0125] In another embodiment, the temporary fastening jig 1 can also be used inverted.

[0126] Although some embodiments of this invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. Furthermore, these embodiments can be combined as appropriate. In addition, this invention can be implemented in various novel forms other than those described above. Therefore, each of the above embodiments can be omitted, replaced, or modified in various ways without departing from the spirit of this invention. Such novel forms and modifications are included in the scope and spirit of this invention, as well as in the claims and equivalents of the claims. [Explanation of Symbols]

[0127] 1: Temporary fastening jig 2: Bottom 2a: Front end 2b: Rear end 21: Lower main body 22: 1st protrusion 22a: Front end 22b: Rear end 22c:Top 24: 1st slope 25:Third slope part 3: Top 3a: Front end 3b: Rear end 31: Upper main body 32:Second protrusion 32a: Front end 32b: Rear end 32c: Top 33: Guide Section 34:Second slope part 35: 4th slope 4:Connection part 5: Reinforcement section 52: Reinforcement section 53: Reinforcement section 54: Reinforcement section 81: Bolt 82: Nut 83: Washer 84: Washer 100: Liner plate 101: Corrugated sheet section 102: Flange 102a :hole 200: Liner plate 201: Corrugated sheet section 202: Flange 202a :hole D: Separation distance

Claims

1. A temporary fastening jig for temporarily fastening a lower liner plate to an upper liner plate, which is connected vertically by flanges having multiple holes drilled in them at the upper and lower ends and left and right ends, The lower and upper parts, separated from each other and facing each other, It has a connecting portion that connects the lower rear end and the upper rear end, and is formed in a U-shape in cross-section, The lower part has a first projection that is spaced apart from the front end of the lower part and protrudes from the lower main body toward the upper part. The upper part has a second projection that is spaced apart from the front end of the upper part and protrudes from the upper body toward the lower part. The first projection is inserted into the hole in the flange of the lower liner plate. The second projection is inserted into the hole in the flange of the upper liner plate. A temporary fastening jig characterized by the following.

2. The protrusion amount of the first projection is 1 mm or more. The protrusion of the second projection shall be 1 mm or more. The temporary fastening jig according to claim 1, characterized by the following:

3. The distance between the lower main body and the upper main body shall be 36.6 mm or less. The temporary fastening jig according to claim 1, characterized by the following:

4. The first projection has a first inclined portion that is connected to the lower main body and inclined upward toward the rear from the front end of the first projection, The rear end of the first projection is spaced apart from the lower main body. The temporary fastening jig according to claim 1, characterized by the following:

5. The second projection has a second inclined portion that slopes downward toward the rear from the front end of the second projection which is connected to the upper main body, The rear end of the second projection is spaced apart from the upper main body. The temporary fastening jig according to claim 1, characterized by the following:

6. The first projection is, A first inclined portion that slopes upward toward the rear from the front end of the first projection connected to the lower main body, The lower main body portion has a third inclined portion that is inclined upward toward the front from the rear end of the first projection that is connected to the lower main body portion. The temporary fastening jig according to claim 1, characterized by the following:

7. The second projection is, A second inclined portion that slopes downward toward the rear from the front end of the second projection connected to the upper main body, The lower main body portion has a fourth inclined portion that slopes downward toward the front from the rear end of the second projection that is connected to the lower main body portion. The temporary fastening jig according to claim 1, characterized by the following:

8. The upper part has a guide portion on the front side of the upper main body that is inclined upward. The temporary fastening jig according to claim 1, characterized by the following:

9. The connecting portion has a reinforcing portion that is bent inward towards the inside of the U-shape. The temporary fastening jig according to claim 1, characterized by the following:

10. The spring steel is bent to form a U-shaped cross-section. The temporary fastening jig according to claim 1, characterized by the following:

11. A temporary fastening method for temporarily fastening the lower liner plate to the upper liner plate using the temporary fastening jig described in claim 1, A first insertion step involves inserting the first projection into the hole in the flange of the lower liner plate, The invention includes a second insertion step of moving the temporary fastening jig forward and inserting the second projection into the hole in the flange of the upper liner plate. A temporary fastening method characterized by the following.

12. After the second insertion step, a fastening step is performed in which bolts are inserted through the holes in the flange of the upper liner plate and the holes in the flange of the lower liner plate to fasten them together. The method further includes a removal step of removing the temporary fastening jig from the flange after the fastening step. The temporary fastening method according to claim 11, characterized by the above.

13. A temporary fastening jig for temporarily fastening a lower liner plate to an upper liner plate, which is connected vertically by flanges having multiple holes drilled in them at the upper and lower ends and left and right ends, The lower and upper parts, separated from each other and facing each other, It has a connecting portion that connects the lower rear end and the upper rear end, and is formed in a U-shape in cross-section, The upper part has a second projection that is spaced apart from the front end of the upper part and protrudes from the upper body toward the lower part. The second projection is inserted into the hole in the flange of the upper liner plate. A temporary fastening jig characterized by the following.

14. A temporary fastening jig for temporarily fastening a lower liner plate to an upper liner plate, which is connected vertically by flanges having multiple holes drilled in them at the upper and lower ends and left and right ends, The lower and upper parts, separated from each other and facing each other, It has a connecting portion that connects the lower rear end and the upper rear end, and is formed in a U-shape in cross-section, The lower part has a first projection that is spaced apart from the front end of the lower part and protrudes from the lower main body toward the upper part. The first projection is inserted into the hole in the flange of the lower liner plate. A temporary fastening jig characterized by the following.

15. A temporary fastening method for temporarily fastening the lower liner plate to the upper liner plate using the temporary fastening jig described in claim 13, A first insertion step involves bringing the upper surface of the lower main body into contact with the lower surface of the flange of the lower liner plate, The invention includes a second insertion step of moving the temporary fastening jig forward and inserting the second projection into the hole in the flange of the upper liner plate. A temporary fastening method characterized by the following.

16. A temporary fastening method for temporarily fastening the lower liner plate to the upper liner plate using the temporary fastening jig described in claim 14, A first insertion step involves inserting the first projection into the hole in the flange of the lower liner plate, The invention includes a second insertion step in which the temporary fastening jig is moved forward to bring the lower surface of the upper main body into contact with the upper surface of the flange of the upper liner plate. A temporary fastening method characterized by the following.

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