Method and structure for connecting belt-shaped members

Abstract

To make it easy to connect ends of strip members without using a coupling member.SOLUTION: Provided is a method of connecting ends of strip members used in the pipe making of spiral pipes 2. The strip members 3 (3F,3R) each have a resin main strip 10, and a metal reinforcement member 20 extending in a strip length direction of the main strip 10 and attached to an outer circumference of the main strip 10. The reinforcement member 20 includes at least a hollow main reinforcement portion 21. A connection method includes: a cutting process in which an end of one strip member 3R is cut off leaving the main reinforcement portion 21 of the reinforcement member 20, and the main reinforcement portion 21 is made protruded from the main strip 10; a processing process in which a protruding end 21E of the main reinforcement portion 21 is pressed from the outside to reduce its cross-section; an insertion process in which the main strips 10 of the two strip members 3F,3R are close to each other in the strip length direction, and the protruding end 21E of the main reinforcement portion 21 of the one strip member 3R is inserted into the main reinforcement portion 21 of the reinforcement member 20 of the other strip member 3F.SELECTED DRAWING: Figure 3C

Description

[Technical field]

[0001] The present invention relates to a method and a connection structure for connecting ends of strip-shaped members used for manufacturing a helical pipe, and to a processing jig used in the connection method. [Background technology]

[0002] A method for rehabilitating an existing pipe, such as an aged sewer pipe, by spirally winding a strip-shaped member (profile) around the inner periphery of the existing pipe to produce a rehabilitating pipe made of a spiral pipe is known. The strip-shaped member includes a main strip material made of polyvinyl chloride resin or the like, and a steel reinforcing member that extends in the strip length direction of the main strip material and is attached to the outer periphery of the main strip material.

[0003] When the length of a belt-shaped member is insufficient during the production of a helical pipe, a new belt-shaped member is added. In the method of connecting belt-shaped members disclosed in Patent Document 1, an end of the main belt material of one belt-shaped member is cut off to make the reinforcing member protrude by a predetermined length, and a predetermined length of the reinforcing member of the other belt-shaped member is cut off to retract its tip from the main belt material. Next, the protruding end of the reinforcing member of one belt-shaped member is assembled to the main belt material of the other belt-shaped member. Next, the tip of the protruding end of the reinforcing member of one belt-shaped member and the tip of the reinforcing member of the other belt-shaped member are connected by an engagement structure consisting of, for example, a claw and a hole.

[0004] The method of connecting belt-shaped members disclosed in Patent Document 2 uses a long, thin, curved joint member made of steel. The joint member has a cross-sectional shape smaller than the hollow main reinforcing parts of the reinforcing members of the belt-shaped members. The joint member is inserted into the main reinforcing parts of the two belt-shaped members and connected to the reinforcing members of the belt-shaped members with screws or the like. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 3396410 [Patent Document 2] JP 2017-13406 A Summary of the Invention [Problem to be solved by the invention]

[0006] The connection strength between the reinforcing members is weak in the connection method of Patent Document 1. The connection method of Patent Document 2 requires the preparation of a joint member having an arc shape that matches the pipe diameter of the helical pipe. [Means for solving the problem]

[0007] In order to solve the above-mentioned problem, the present invention provides a method for connecting ends of strip-shaped members used in manufacturing a spiral pipe, the strip-shaped member comprising a resin main strip material and a metal reinforcing member extending in the strip length direction of the main strip material and attached to the outer periphery of the main strip material, the reinforcing member including at least a hollow main reinforcing portion, the method comprising: a cutting process for cutting away from an end of one strip-shaped member leaving the main reinforcing portion of the reinforcing member and causing the main reinforcing portion to protrude from the main strip material; a processing process for pressing the protruding end of the main reinforcing portion from the outside to reduce its cross-section; and an insertion process for bringing the main strip materials of two strip-shaped members closer to each other in the strip length direction and inserting the protruding end of the main reinforcing portion of one strip-shaped member into the main reinforcing portion of the reinforcing member of the other strip-shaped member. According to this method, the belt-shaped members can be connected without using a separate joint member, and the protruding end of the main reinforcing portion of one belt-shaped member is inserted into the main reinforcing portion of the other belt-shaped member, thereby ensuring the connection strength.

[0008] When connecting strip-shaped members in which the reinforcing member has a pair of engaging arms extending from both sides of the main reinforcing portion and the pair of engaging arms are configured to respectively engage with a pair of engaging ribs formed on the outer peripheral surface of the main strip material, the pair of engaging arms of the reinforcing member are also cut off during the cutting process.

[0009] When the main reinforcing portion of the reinforcing member connects band-shaped members each having a U-shaped cross section, with a top wall facing the main band material at a distance and a pair of side walls rising from the main band material and connected to the top wall, the cross section of the main reinforcing portion is reduced by bending the top wall and the pair of side walls inward in the processing step. According to this method, the cross section of the U-shaped main reinforcing portion can be reliably reduced.

[0010] Preferably, the method further includes a step of connecting the protruding end of the main reinforcing portion of the one belt-shaped member to the main reinforcing portion of the other belt-shaped member, thereby making it possible to further increase the connection strength.

[0011] Another aspect of the present invention is a structure for connecting ends of strip-shaped members used in the manufacturing of spiral pipes, wherein the strip-shaped members comprise a resin main strip material and a metal reinforcing member extending in the strip length direction of the main strip material and attached to the outer periphery of the main strip material, the reinforcing member including at least a hollow main reinforcing portion, and in one strip-shaped member, the main reinforcing portion protrudes from the end of the main strip material and the protruding end of the main reinforcing portion has a reduced cross-section, and the protruding end of the main reinforcing portion of the one strip-shaped member is inserted into the main reinforcing portion of the reinforcing member of the other strip-shaped member.

[0012] Preferably, the main reinforcing portion of the reinforcing member has a top wall facing the main strip material at a distance and a pair of side walls rising from the main strip material and connected to the top wall, forming a C-shaped cross section, and the protruding end of the main reinforcing portion of one of the strip-shaped members has a reduced cross section with the top wall and the pair of side walls folded inward.

[0013] Yet another aspect of the present invention is a processing jig used in the processing step in the method for connecting the belt-shaped members, comprising a holding block extending in a straight line and holding the protruding end of the main reinforcement portion, a pressing block extending in a straight line and arranged opposite the holding block, a support for fixing one of the holding block and the pressing block and supporting the other block so that it can move in the opposing direction, and a moving means for moving the other block in the opposing direction relative to the one block, wherein the holding block has a holding surface on which the pair of side walls of the protruding end rests, and a pair of regulating surfaces connected to the holding surface and regulating outward deformation of the pair of side walls, and wherein by bringing the one block closer to the other block by the moving means, the top wall of the main reinforcement portion is bent inward by the pressing block, and the pair of side walls regulated by the pair of regulating surfaces are buckled and bent inwardly, thereby reducing the cross-section of the main reinforcement portion. This machining jig makes it possible to reduce the cross section of the main reinforcing portion having a U-shaped cross section with a relatively simple structure and operation.

[0014] Another embodiment of the processing jig includes a support, a holding block that extends linearly and is fixed to the support and that is covered by the protruding end of the main reinforcement portion, the holding block having a first surface facing the top wall of the protruding end and a pair of second surfaces facing the pair of side walls of the protruding end, and a molding groove extending in the longitudinal direction is formed on the first surface and the pair of second surfaces, a first pressing block that extends linearly and is arranged parallel to the holding block and faces the first surface, and a second pressing block that extends linearly and is arranged parallel to the holding block and faces the pair of second surfaces. the top wall is bent inward by cooperation of the first pressing block and the molding groove formed on the first surface of the holding block, and the pair of second pressing blocks and the molding groove formed on the pair of second pressing blocks and the pair of second surfaces of the holding block, thereby reducing the cross-section of the protruding end of the main reinforcement part. With this processing jig, the cross section of the main reinforcing portion having a U-shaped cross section can be reliably reduced by applying pressure from three directions. [Brief description of the drawings]

[0015] [Figure 1] 1 is a diagram showing an outline of a process for producing a rehabilitation pipe (helical pipe) along the inner circumference of an existing pipe using a strip-shaped member. [Diagram 2] FIG. 4 is a cross-sectional view of the belt-shaped member. [Figure 3A] 1 is a plan view showing the end of a preceding strip member and the beginning of a succeeding strip member to be joined; [Figure 3B] 13 is a plan view showing a process of cutting off the engaging arm portion of the main strip material and the reinforcing member from the starting end portion of the subsequent strip-shaped member to cause the main reinforcing portion of the reinforcing member to protrude. FIG. [Figure 3C] 13 is a plan view showing a process of reducing the cross section of the protruding end portion of the main reinforcing portion. FIG. [Figure 3D] 13 is a plan view showing a process of inserting and connecting the protruding end portion of the main reinforcing portion having a reduced cross section to the main reinforcing portion of the preceding belt-shaped member. FIG. [Figure 4] 11 is a side view showing a processing jig that presses the protruding end of the main reinforcing part from the outside to reduce its cross section. FIG. [Diagram 5] 5 is a cross-sectional view taken along the line V-V in FIG. 4, in which (A) shows the state before pressing, and (B) shows the state after pressing. [Figure 6] FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 3D. [Figure 7] FIG. 13 is a side view showing a modified example of the processing jig. [Figure 8] 8 is a cross-sectional view taken along the line VIII-VIII in FIG. 7. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] An embodiment of the present invention will be described below with reference to the drawings. As shown in Fig. 1, the inner surface of an existing pipe 1, such as an aged sewer pipe, is lined with a rehabilitation pipe 2 (spiral pipe), thereby rehabilitating the existing pipe 1. In addition to sewer pipes, examples of the existing pipe 1 include water supply pipes, agricultural water pipes, hydroelectric power generation water pipes, gas pipes, etc. Also, the pipe is not limited to a cylindrical pipe, and may be a tunnel.

[0017] The rehabilitating pipe 2 is manufactured by spirally winding a strip-shaped member 3 (profile) around the inner circumference of the existing pipe 1. As described below, the strip-shaped member 3 is added during the manufacturing process. In the following explanation and drawings, when distinguishing between a preceding strip-shaped member and a succeeding strip-shaped member used in manufacturing the rehabilitating pipe 2, the preceding strip-shaped member will be given the symbol 3F and the succeeding strip-shaped member will be given the symbol 3R.

[0018] As shown in Fig. 2, the belt-shaped member 3 includes a main belt material 10 and a reinforcing member 20 extending in the belt length direction of the main belt material 10. The main belt material 10 is obtained by extrusion molding a resin such as polyvinyl chloride or polyethylene. The reinforcing member 20 is made of a steel plate (metal plate).

[0019] The main band material 10 has a flat band portion 11, mating portions 13 and 14 formed on both side edges of the flat band portion 11, a pair of engaging ribs 15 formed on the outer peripheral surface of the flat band portion 11 and standing perpendicular to the flat band portion 11, and a reinforcing rib 17. These extend in the band length direction of the main band material 10. The flat band portion 11 is formed in a flat band shape, and the flat band portion 11 defines a smooth inner peripheral surface of the rehabilitating pipe 2. The mating portions 13 and 14 have complementary shapes.

[0020] The reinforcing member 20 is disposed between a pair of engaging ribs 15 on the outer circumferential side of the flat belt portion 11, in other words, on the opposite side to the surface that will become the inner circumferential surface of the rehabilitation pipe 2. The reinforcing member 20 has a hollow main reinforcing portion 21 having a U-shaped cross section and a pair of engaging arms 25. The main reinforcing portion 21 has a downward U-shaped cross section, a top wall 22 that is parallel to the flat belt portion 11 and faces the flat belt portion 11 at a distance, and a pair of side walls 23 that rise from the flat belt portion 11 and continue to the top wall portion 22. Each engaging arm 25 extends in the width direction along the flat belt portion 11 from the base end edge of the side wall 22 and further rises obliquely. The reinforcing member 20 is attached to the main belt material 10 by engaging the tips of the pair of arms 25 with the protruding portions 15a at the tips of the pair of engaging ribs 15.

[0021] The belt-shaped member 3 is wound in a spiral shape by a pipe-making machine, and the fitting portions 13, 14 of adjacent wound portions are pressed in the thickness direction and fitted together to produce the rehabilitating pipe 2 shown in FIG.

[0022] <Method of connecting belt-shaped members> Since one strip-shaped member 3 is not enough to line the entire length of the existing pipe 1 with the rehabilitation pipe 2, additional strip-shaped members 3 are added. That is, the end of the preceding strip-shaped member 3F used in manufacturing the rehabilitation pipe 2 is connected to the start of the succeeding strip-shaped member 3R. This connection method is explained below. <Preparation process> As shown in FIG. 3A, the end of the preceding strip-shaped member 3F and the beginning of the succeeding strip-shaped member 3R are cut using a saber saw or grinder, and the end faces are trimmed so that they are perpendicular to the strip length direction.

[0023] <Cutting process> Next, the starting end of the succeeding strip-shaped member 3R is cut using the same cutting tool as above, along two cutting lines X1 extending in the strip length direction as shown in FIG. 2, for a predetermined length (e.g., about 80 mm) from the tip, and along two cutting lines X2 extending in the strip width direction as shown in FIG. 3A (above the predetermined length from the tip). As a result, as shown in FIG. 3B, the main strip material 10 is entirely removed over a predetermined length from the tip of the strip-shaped member 3R, and the pair of engagement receiving portions 25 of the reinforcing member 20 are removed, leaving only the main reinforcing portion 21 of the reinforcing member 20. In other words, the main reinforcing portion 21 protrudes from the tip of the main strip material 10. This protruding end is designated by the reference symbol 21E in the figure.

[0024] <Processing process> Next, as shown in FIG. 3C, the protruding end 21E of the main reinforcing portion 21 of the reinforcing member 20 of the following belt-shaped member 3R is processed to reduce its cross section. First, the jig 30 used for this processing will be described with reference to FIG. 4 and FIG. 5. The processing jig 30 has a U-shaped support 31. The support 31 has an upper arm portion 31a and a lower arm portion 31b that extend linearly in parallel with each other, and a connecting arm portion 31c that is connected to one end of the upper arm portion 31a and the lower arm portion 31b. On the lower surface of the upper arm portion 31a, a pressing block 32 that extends linearly in the extension direction of the upper arm portion 31a is provided integrally with the upper arm portion 31a. The lower surface of the pressing block 32 has a mountain-shaped cross section with a protruding center. A screw hole 33 is formed in the lower arm portion 31a.

[0025] Between the upper arm 31a and the lower arm 31b, a linearly extending holding block 34 is disposed in parallel with the pressing block 32 and facing the pressing block 32 in the vertical direction. Two guide rods 35 (guide means) are attached to each of the two sides of the support 31 and are stretched between the upper arm 31a and the lower arm 31b, and the guide rods 35 prevent the holding block 34 from moving laterally. A recess is formed on the upper surface of the holding block 34, extending linearly in the longitudinal direction of the holding block 34. In this recess, a holding surface 34a and a pair of regulating surfaces 34b rising from both side edges of the holding surface 34a are formed. The pair of regulating surfaces 34b are inclined so as to move slightly apart toward the upper side.

[0026] The processing jig 30 further includes a moving means 36 for moving the holding block 34 in the up and down direction. The moving means 36 includes a screw rod 36a that screws into the screw hole 33 of the lower arm 31b, and a handle 36b provided at the lower end of the screw rod 36a. The upper end of the screw rod 36a is rotatably connected to the lower surface of the holding block 34.

[0027] As shown in Fig. 5(A), the protruding end 21E of the main reinforcing portion 21 of the belt-shaped member 30R is set in a state where it is accommodated in the recess of the holding block 34. The side wall 23 of the protruding end 21E rests on the holding surface 34a of the holding block 34, and the top wall 22 is separated from the holding surface 34a and faces the pressure. The lower edges of the pair of side walls 23 are located at the intersection of the holding surface 34a and the regulating surface 34b.

[0028] Next, when the holding block 34 is moved toward the pressing block 32 by the moving means 36, the top wall 22 of the protruding end 21E of the main reinforcing part 21 comes into contact with the pressing block 32, and when the holding block 34 is further moved, the top wall 22 is bent inward by the pressing block 32. The pressing force of the pressing block 32 also acts on the pair of side walls 23 of the protruding end 21E. These side walls 23 buckle inward because they are restricted from bulging outward by the pair of restricting surfaces 34b of the holding block 34. As a result, as shown in FIG. 5(B), the top wall 22 and the pair of side walls 23 are bent inward, reducing the cross section of the protruding end 21E.

[0029] In the connecting tool 30, the holding block 34 may be fixed to the support 31, and the pressing block 32 may be moved by the moving means 36.

[0030] <Insertion process> Next, as shown in Figure 3C, with the starting end of the subsequent strip member 3R and the terminal end of the preceding strip member 3F facing each other, the starting end of the strip member 3R is moved toward the terminal end of the strip member 3F in the strip length direction, so that, as shown in Figures 3D and 6, the protruding end 21E of the main reinforcing portion 21 with a reduced cross-section is inserted into the main reinforcing portion 21 of the reinforcing member 20 of the preceding strip member 3F, and the starting end face of the main strip material 10 of the strip member 3R is moved toward a position where it is abutted against or slightly separated from the terminal end face of the main strip material 10 of the preceding strip member 3F.

[0031] ≪Connection process≫ Next, as shown in Figures 3D and 6, the top wall 22 of the main reinforcing portion 21 of the strip-shaped member 3F and the top wall 22 of the protruding end portion 21E of the main reinforcing portion 21 of the strip-shaped member 3R are connected at multiple points spaced apart in the strip length direction using screws 40.

[0032] As described above, the connection between the leading belt-shaped member 3F and the trailing belt-shaped member 3R is completed. During this connection, the main reinforcing parts 20 of the reinforcing members 20 overlap over a predetermined length, so that the connection strength can be increased. In addition, there is no need to use an arc-shaped joint member that is stretched between the reinforcing members 20, 20 of the two belt-shaped members 3F, 3R.

[0033] After connecting the strip-shaped members 3F, 3R (after joining the strip-shaped member 3R to the strip-shaped member 3F), the pipe-making machine resumes the pipe-making process for the rehabilitating pipe 2. After the pipe-making process for the rehabilitating pipe 2 is completed, the main strip materials 10, 10 of the strip-shaped members 3F, 3R are resin-welded.

[0034] <Modification of processing jig> Instead of the processing jig 30 in Figures 4 and 5, a processing jig 50 shown in Figures 7 and 8 may be used. This processing jig 50 has a cylindrical support 51 that has a rectangular cross section and extends linearly. A holding block 52 that extends linearly in the extension direction of the support 51 is fixed to the center of the upper surface of a lower plate portion 51a of this support 51. Forming grooves 52a, 52b extending in the longitudinal direction are formed on the upper surface (first surface) and both side surfaces (second surfaces) of this holding block 52.

[0035] In the support 51, a pressing block 53 (first pressing block) facing the upper surface of the holding block 52 is arranged, and a pair of pressing blocks 54 (second pressing blocks) facing both side surfaces of the holding block 52 are arranged. These pressing blocks 53, 54 extend linearly, are maintained parallel to the holding block 52 by a guide means (not shown), and are supported so as to be movable in a direction approaching and receding from the holding block 52. The tip surfaces of the pressing blocks 53, 54 have a mountain-shaped cross section corresponding to the molding grooves 52a, 52b of the holding block 52. The moving means for the pressing blocks 53, 54 is composed of a screw rod 55. The screw rod 55 is screwed into a screw hole formed in the top plate portion 51b and the pair of side plate portions 51c of the support 51, and the tip portion is rotatably connected to the pressing blocks 53, 54.

[0036] With the protruding end 21E of the main reinforcing part 21 of the following strip-shaped member 3R covered on the holding block 52, the screw rod 55 is turned to move the pressing blocks 53, 54 toward the holding block 52, whereby the top wall 22 of the protruding end 21E is bent inward by the cooperation of the pressing block 53 and the forming groove 52a, and the side wall 23 is bent inward by the cooperation of the pressing block 54 and the forming groove 52b, resulting in a reduction in the cross section of the protruding end 21E. Note that in this processing, the top wall 22 and the side wall 23 may or may not reach the faces of the forming grooves 52a, 52b.

[0037] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. The main band material and reinforcing members of the band-shaped member shown in the figures are merely examples, and are not limited to the cross-sectional shapes shown in the figures, and various other shapes can be applied. In the above-described embodiment, the main reinforcement portion of the trailing strip member protrudes from the main strip material, but the main reinforcement portion of the preceding strip member may also protrude from the main strip material and be inserted into the main reinforcement portion of the trailing strip member. The top wall 22 of the main reinforcement portion 21 of the belt-shaped member 3F and the top wall 22 of the protruding end portion 21E of the main reinforcement portion 21 of the belt-shaped member 3R are connected by screws 40, but the main reinforcement portion may be welded after inserting the protruding end portion 21E. The band-shaped member of the present invention is not limited to being used for rehabilitating pipes that are lined on the inner circumference of existing pipes, but can also be used as a band-shaped member for use in the manufacture of various spiral pipes. [Industrial Applicability]

[0038] The present invention can be applied to a method for connecting belt-shaped members used in the production of helical pipes. [Explanation of symbols]

[0039] 1 Existing pipes 2 Rehabilitation pipe (spiral pipe) 3. Strip-shaped member (profile) 3F Leading strip (other strip) 3R Subsequent strip (one strip) 10 Main strip material 20 Reinforcement member 21 Main reinforcement 21E Protruding end of main reinforcement 22 Ceiling Wall 23 Side wall 25 Engagement arm 30 Processing Jig 31 Support 32 Pressing Block 34 Holding Block 34a Holding surface 34b Regulatory aspects 36 Transportation 50 Processing Jig 51 Support 52 Holding Block 52a,52b Molding groove 53 Pressing block (first pressing block) 54 Pressing block (second pressing block) 55 Screw Rod (Means of Transportation)

Claims

1. A method for connecting ends of a strip-shaped member used in manufacturing a helical pipe, comprising the steps of: The belt-shaped member includes a resin main belt material and a metal reinforcing member that extends in a belt length direction of the main belt material and is attached to the main belt material, the reinforcing member including at least a hollow main reinforcing portion, a cutting step of cutting away the main reinforcing portion of the reinforcing member from an end portion of one of the belt-shaped members so that the main reinforcing portion protrudes from the main belt material; a processing step of pressing the protruding end of the main reinforcing portion from the outside to reduce its cross section; an insertion process in which the main strip materials of the two strip-shaped members are brought closer to each other in a strip length direction, and the protruding end portion of the main reinforcing portion of one of the strip-shaped members is inserted into the main reinforcing portion of the reinforcing member of the other strip-shaped member; a step of connecting the protruding end portion of the main reinforcing portion of the one belt-shaped member to the main reinforcing portion of the other belt-shaped member; A method for connecting belt-shaped members, comprising:

2. the reinforcing member has a pair of engaging arms connected to both sides of the main reinforcing portion, and the pair of engaging arms respectively engage with a pair of engaging ribs formed on an outer peripheral surface of the main strip material, 2. The method for connecting belt-shaped members according to claim 1, wherein the pair of engaging arms of the reinforcing member are also cut off in the cutting step.

3. The main reinforcing portion of the reinforcing member has a cross-sectional U-shape before the processing step, the cross-section of which has a top wall facing the main strip material and a pair of side walls rising from the main strip material and continuing to the top wall, A method for connecting belt-shaped members as described in claim 1 or 2, characterized in that in the processing step, the cross-section of the protruding end portion of the main reinforcing portion of one of the belt-shaped members is reduced by folding inward the top wall and the pair of side walls at the protruding end portion.

4. A structure for connecting ends of a strip-shaped member used in the production of a spiral pipe, The belt-shaped member includes a resin main belt material and a metal reinforcing member that extends in a belt length direction of the main belt material and is attached to an outer periphery of the main belt material, the reinforcing member including at least a hollow main reinforcing portion, the main reinforcing portion of one of the belt-shaped members has a main portion attached to the main belt material and a protruding end portion connected to the main portion and protruding from an end of the main belt material, the protruding end portion having a cross-section smaller than that of the main portion, A connection structure of belt-shaped members, characterized in that the protruding end portion of the main reinforcement portion of one belt-shaped member is inserted into the main reinforcement portion of the reinforcing member of the other belt-shaped member and connected to the main reinforcement portion.

5. The main portion of the main reinforcing portion of the one strip member and the main reinforcing portion of the other strip member have a top wall spaced apart from and facing the main strip material and a pair of side walls rising from the main strip material and continuing to the top wall, forming a U-shaped cross section, The connection structure of belt-shaped members as described in claim 4, characterized in that the protruding end portion of the main reinforcing portion of one of the belt-shaped members has a top wall portion bent inwardly from the top wall of the main portion and a pair of side wall portions bent inwardly from the pair of side walls of the main portion, thereby reducing the cross-section.

6. Prepare a processing jig; the processing jig includes a holding block extending linearly and holding the protruding end of the main reinforcing part, a pressing block extending linearly and disposed opposite the holding block, a support that fixes one of the holding block and the pressing block and supports the other block movably in the opposing direction, and a moving means that moves the other block relative to the one block in the opposing direction, the holding block has a holding surface on which the pair of side walls of the protruding end portion rests, and a pair of restriction surfaces connected to the holding surface and restricting outward deformation of the pair of side walls, The method for connecting belt-shaped members as described in claim 3, characterized in that by using the moving means to bring the other block closer to the one block, the top wall of the main reinforcement part is bent inwardly by the pressing block, and the pair of side walls restricted by the pair of restricting surfaces are buckled and bent inwardly, thereby reducing the cross-section of the protruding end part of the main reinforcement part.

7. A processing jig is prepared, the processing jig comprising: Support and a retaining block extending linearly and fixed to the support, the retaining block being fitted with the protruding end of the main reinforcing part, the retaining block having a first surface facing the top wall of the protruding end and a pair of second surfaces facing the pair of side walls of the protruding end, the first surface and the pair of second surfaces having molding grooves formed therein extending in a longitudinal direction; a first pressing block extending linearly and disposed parallel to the holding block and facing the first surface; a pair of second pressing blocks extending linearly and arranged parallel to the holding block and facing the pair of second surfaces; three moving means for moving the first pressing block and the pair of second pressing blocks toward the holding block, respectively; Equipped with The method for connecting belt-shaped members as described in claim 3, characterized in that the top wall is bent inward by cooperation between the first pressing block and the molding groove formed on the first surface of the holding block, and the pair of side walls are bent inward by the pair of second pressing blocks and the molding groove formed on the pair of second surfaces of the holding block, thereby reducing the cross-section of the protruding end of the main reinforcement portion.

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