Cylindrical body connecting method and cylindrical body crimping tool

Abstract

To provide a cylindrical body connection method and a cylindrical body caulking device capable of reducing a work load for caulking a cylindrical member large in diameter or high in strength.SOLUTION: This cylindrical body connection method comprises: an insertion step of inserting a joint member into first and second cylindrical members or inserting the first and second cylindrical members into the joint member over the first and second cylindrical members; a first fitting step of fitting a cylindrical body caulking device to the outer periphery of the first cylindrical member or the joint member; a first caulking step of pressing, after or simultaneously with the first fitting step, a circumferential part of the first cylindrical member or the joint member, and caulking and connecting the first cylindrical member and the joint member; a second fitting step of fitting the cylindrical body caulking device to the outer periphery of the second cylindrical member or the joint member; and a second caulking step of pressing, after or simultaneously with the second fitting step, a circumferential part of the second cylindrical member or the joint member, and caulking and connecting the second cylindrical member and the joint member.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for connecting cylindrical bodies and a tool for crimping cylindrical bodies. [Background technology]

[0002] Conventionally, a method of connecting multiple tubular members using a crimping tool has been known. For example, Patent Document 1 describes a pipe crimping tool in which a joint pipe is inserted into two pipes and spanning the two pipes, and the pipes are clamped in the gap between the opposing prongs with the left and right handles open, and the left and right handles are closed inward to crimp the pipes with the opposing prongs. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 63-127717 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the pipe crimping tool described in Patent Document 1, the left and right handles must be manually closed inward, so while it can crimp small diameter, low strength pipes, it cannot crimp large diameter or high strength pipes, or even if it can, the crimping operation is difficult.

[0005] The present invention has been made in consideration of the above problems, and its purpose is to provide a tubular body connecting method and a tubular body crimping tool that can reduce the workload when crimping tubular members with large diameters or high strength. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the tubular body connecting method of the present invention is characterized by comprising: an insertion step of inserting a joint member into a first tubular member and a second tubular member, or inserting the first tubular member and the second tubular member into the joint member, spanning the first tubular member and the second tubular member; a first attachment step of attaching a tubular body crimping tool to the outer periphery of the first tubular member or the joint member; a first crimping step of pressing a circumferential portion of the first tubular member or the joint member after or in parallel with the first attachment step to crimp and connect the first tubular member and the joint member; a second attachment step of attaching a tubular body crimping tool to the outer periphery of the second tubular member or the joint member; and a second crimping step of pressing a circumferential portion of the second tubular member or the joint member after or in parallel with the second attachment step to crimp and connect the second tubular member and the joint member.

[0007] In the tubular body connecting method according to the present invention, it is preferable that the first crimping step involves supporting a circumferential portion of the first tubular member or the joint member by surface contact, and then pressing a portion opposite the supported portion to crimp and connect the first tubular member and the joint member, and the second crimping step involves supporting a circumferential portion of the second tubular member or the joint member by surface contact, and then pressing a portion opposite the supported portion to crimp and connect the second tubular member and the joint member.

[0008] In the tubular body connecting method according to the present invention, the first crimping step may further include a step of pressing a portion opposite to the supported portion in a state in which another circumferential portion of the first tubular member or the joint member is supported by surface contact, thereby crimping and connecting the first tubular member and the joint member, and the second crimping step may further include a step of pressing a portion opposite to the supported portion in a state in which another circumferential portion of the second tubular member or the joint member is supported by surface contact, thereby crimping and connecting the second tubular member and the joint member.

[0009] In the tubular body connecting method according to the present invention, it is preferable that the first crimping step involves simultaneously pressing a circumferential portion of the first tubular member or the joint member and another circumferential portion different from the circumferential portion to crimp and connect the first tubular member and the joint member, and the second crimping step involves simultaneously pressing a circumferential portion of the second tubular member or the joint member and another circumferential portion different from the circumferential portion to crimp and connect the second tubular member and the joint member.

[0010] Furthermore, the tubular body crimping tool of the present invention is a tubular body crimping tool that crimps and connects a tubular member and a joint member that is inserted into the tubular member or through which the tubular member is inserted, and is characterized in that it comprises a main body portion that can surround the outer periphery of the tubular member or the joint member, and a pressing portion that can press a circumferential portion of the tubular member or the joint member, and the main body portion comprises a first main body portion that surrounds a portion of the tubular member or the joint member, a second main body portion that surrounds other portions of the tubular member or the joint member, and a fastening portion that brings the first main body portion and the second main body portion closer to or apart from each other, and is configured to be attachable to the outer periphery of the tubular member or the joint member by the fastening portion.

[0011] In the tubular body crimping tool of the present invention, it is preferable that the fastening portion comprises a fastening bolt provided at the tip side of one of the first main body portion and the second main body portion, an insertion portion provided at the tip side of the other of the first main body portion and the second main body portion, through which the fastening bolt is inserted, and a nut threaded onto the fastening bolt.

[0012] In the tubular body crimping tool of the present invention, the pressing portion may be provided on at least one of the first main body portion and the second main body portion, and when the fastening bolt is inserted into the insertion portion, the nut may be tightened on the fastening bolt to tighten the first main body portion and the second main body portion in a direction that brings them closer to each other, and the pressing portion may be configured to press the tubular member or the joint member, thereby crimping and connecting the tubular member and the joint member.

[0013] In the tubular body crimping tool according to the present invention, it is preferable that the pressing portion has a protrusion that presses the tubular member or the joint member, and that the protrusion has a curved tip.

[0014] The tubular body crimping tool according to the present invention may further include a receiving portion capable of supporting a portion of the tubular member or the joint member facing the pressing portion by surface contact, and may be configured to be able to crimp and connect the tubular member and the joint member by pressing the tubular member or the joint member with the pressing portion while the tubular member or the joint member is supported by the receiving portion.

[0015] In the tubular body crimping tool according to the present invention, it is preferable that the receiving portion has a positioning hole portion that penetrates from a support surface that supports the tubular member or the joint member to a surface opposite to the support surface.

[0016] In the tubular body crimping tool according to the present invention, the receiving portion may be configured to be able to support the tubular member or the joint member in a region of 90° or more and less than 180° in the circumferential direction by surface contact.

[0017] In the tubular body crimping tool according to the present invention, it is preferable that the pressing portion is provided on each of the first body portion and the second body portion. [Effects of the Invention]

[0018] According to the cylindrical body connecting method and cylindrical body crimping tool of the present invention, it is possible to reduce the workload when crimping a cylindrical member having a large diameter or high strength. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 2 is a perspective view showing a cylindrical body crimping tool according to the present embodiment. [Figure 2] FIG. 2 is a side view showing the cylindrical body crimping tool according to the present embodiment. [Figure 3] 10 is a diagram showing a state in which a joint member is inserted into a cylindrical member according to the embodiment. FIG. [Figure 4] 10A and 10B are diagrams showing a state in which the receiving portion according to the embodiment supports a part of the circumferential direction of the cylindrical member by surface contact. [Figure 5] 10 is a diagram showing a state in which the tubular member and the joint member according to the present embodiment are crimped at one point. FIG. [Figure 6] 10A and 10B are diagrams showing a state in which the receiving portion according to the embodiment supports another portion of the cylindrical member in the circumferential direction by surface contact. [Figure 7] 10 is a diagram showing a state in which the cylindrical member and the joint member according to the present embodiment are crimped at two points. FIG. [Figure 8] FIG. 2 is a view showing a state in which a first cylindrical member and a second cylindrical member according to the present invention are connected to each other. [Figure 9] FIG. 10 is a side view showing a modified example of the cylindrical body crimping tool. [Figure 10] 10 is a diagram showing a state in which a cylindrical body crimping tool according to a modified example is attached to a cylindrical member. FIG. [Figure 11] 10 is a view showing a state in which a cylindrical body crimping tool according to a modified example has crimped a cylindrical member and a joint member at two points. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0020] Preferred embodiments for carrying out the present invention will be described below with reference to the drawings. Note that the following embodiments do not limit the inventions according to the claims, and not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention. Furthermore, in the present embodiments, the scale and dimensions of each component may be exaggerated, and some components may be omitted.

[0021] [Overall structure of the cylindrical body crimping tool] The tubular body crimping tool 1 according to this embodiment is a tubular body crimping tool that crimps and connects a tubular member 2 and a joint member 3 that is inserted into the tubular member 2 or through which the tubular member 2 is inserted. Specifically, as shown in Figures 1 and 2, the tubular body crimping tool 1 includes a main body 10 that can surround the outer periphery of the tubular member 2 or the joint member 3, a pressing part 20 that can press a portion of the tubular member 2 or the joint member 3 in the circumferential direction, and a receiving part 30 that can support, by surface contact, a portion of the tubular member 2 or the joint member 3 that faces the pressing part 20.

[0022] Below, in this embodiment, the configuration of the tubular body crimping tool 1 and the tubular body connecting method will be explained, assuming that the joint member 3 is inserted into the tubular member 2. However, as described above, the tubular body crimping tool 1 of this embodiment can also be applied when the tubular member 2 is inserted into the joint member 3, and there is no difference in the configuration of the tubular body crimping tool 1 and the tubular body connecting method between when the joint member 3 is inserted into the tubular member 2 and when the tubular member 2 is inserted into the joint member 3.

[0023] Furthermore, in this embodiment, the main body portion 10, the pressing portion 20, and the receiving portion 30 are described as being made of separate members, but this is not limited to this, and the main body portion 10, the pressing portion 20, and the receiving portion 30 may also be formed by integral molding.

[0024] In this embodiment, the tubular member 2 is, for example, SGP (carbon steel pipe for piping) or STK (carbon steel pipe for general structure), but is not limited thereto. Also, in this embodiment, the joint member 3 can be made of various known metallic materials.

[0025] [Main body configuration] 1 and 2, the main body 10 includes a first main body 11 that surrounds a portion of the circumferential direction of the tubular member 2 and a second main body 12 that surrounds another portion of the circumferential direction of the tubular member 2. The first main body 11 is formed in a substantially semicircular shape that forms a semicircular portion of the annular main body 10, and the second main body 12 is formed in a substantially semicircular shape that forms the remaining semicircular portion of the annular main body 10. The first main body 11 and the second main body 12 are rotatably connected to each other by a shaft 13a at the base end (one end in the circumferential direction) of the main body 10. The first main body 11 and the second main body 12 each have arc-shaped recesses 11a, 12a on their inner circumferential surfaces.

[0026] Furthermore, the main body 10 is provided with a fastening portion 14 that moves the first main body 11 and the second main body 12 closer to or apart from each other, and is configured to be mountable to the outer periphery of the tubular member 2 by the fastening portion 14. The fastening portion 14 is provided with a fastening bolt 14a provided on the tip side (the other end in the circumferential direction) of the second main body 12, an insertion portion 14b provided on the tip side of the first main body 11 and through which the fastening bolt 14a is inserted, and a nut 14c that screws onto the fastening bolt 14a. Note that a configuration in which the fastening bolt 14a is provided on the first main body 11 and the insertion portion 14b is provided on the second main body 12 may also be used.

[0027] The fastening bolt 14a protrudes from the second body portion 12 toward the first body portion 11 and is rotatably attached to the second body portion 12 by the shaft portion 13b. The insertion portion 14b is a notch formed by cutting out the center of the tip of the first body portion 11 in the circumferential direction, and the insertion portion 14b forms a substantially U-shape at the tip of the first body portion 11. In the fastening portion 14 according to this embodiment, when the fastening bolt 14a is inserted through the insertion portion 14b, the first body portion 11 and the second body portion 12 approach each other by tightening the nut 14c, and the first body portion 11 and the second body portion 12 move away from each other by loosening the first body portion 11 and the second body portion 12. Note that various known connecting members can be used as the shaft portion 13a and the shaft portion 13b.

[0028] 2, the first body portion 11 has a through hole 11b formed at a position corresponding to a screw receiving portion 21a provided on a base portion 21 of the pressing portion 20, which will be described later, when the pressing portion 20 is attached. The second body portion 12 has a through hole 12b formed at a position corresponding to a positioning hole 31 of the receiving portion 30, which will be described later, when the receiving portion 30 is attached.

[0029] The material constituting the main body 10 may be any material that has a strength sufficient to withstand the stress generated when the pressing portion 20 described below presses the cylindrical member 2.

[0030] [Configuration of the pressing part] The pressing portion 20 is provided on at least one of the first body portion 11 and the second body portion 12, and in this embodiment, is provided on the first body portion 11. Specifically, the pressing portion 20 includes an arc-shaped base portion 21 that is attached so as to fit into the recess 11a of the first body portion 11, and a protrusion portion 22 that protrudes from the base portion 21 toward the second body portion 12 and presses the tubular member 2.

[0031] The base 21 has a size that allows it to fit into the recess 11a of the first main body portion 11 in the circumferential and axial directions, and is longer in the radial direction than the recess 11a. The base 21 is provided with a concave screw receiving portion 21a that extends from near the center of its outer circumferential surface to near the center of the base 21. The protrusion 22 is formed with a generally triangular cross section that protrudes from near the center of the inner circumferential surface of the base 21 toward the second main body portion 12, and its tip 22a is formed with a curved surface. Note that it is sufficient that the protrusion 22 has at least a length in the protruding direction that allows it to crimp the cylindrical member 2 and the joint member 3 when pressing the cylindrical member 2.

[0032] The pressing portion 20 is configured to be detachable from the main body portion 10. Specifically, when the base portion 21 is attached to the recess 11a of the first main body portion 11, the pressing portion 20 is fixed to the main body portion 10 by threading the screw receiving portion 21a of the base portion 21 with a screw member 4 such as a screw or bolt that passes through the through hole 11b of the first main body portion 11, and is configured to be removed from the main body portion 10 by removing the screw member 4 from the screw receiving portion 21a. Note that, as shown in FIG. 2 , the screw member 4 is formed so that its axial length is longer than the axial length of the screw receiving portion 21a provided on the base portion 21.

[0033] Furthermore, the pressing portion 20 is configured to be movable toward and away from the first main body portion 11 along the protruding direction of the protrusion 22. Specifically, the pressing portion 20 is configured to advance from the first main body portion 11 side toward the second main body portion 12 side and press the tubular member 2 by threading the screw member 4 toward the second main body portion 12 side. On the other hand, the pressing portion 20 is configured to retreat toward the first main body portion 11 side and move away from the tubular member 2 by retreating the screw member 4 toward the first main body portion 11 side.

[0034] The pressing portion 20 is preferably made of a material having a higher hardness than the cylindrical member 2 and the joint member 3, and in this embodiment, it is made of a material equivalent to S45C.

[0035] [Configuration of receiving part] The receiving portion 30 is provided on the second main body portion 12 of the main body portion 10, and is formed in an arc shape having a length in the radial direction longer than that of the recessed portion 12a. The receiving portion 30 is configured to be able to support a portion of the circumferential direction of the cylindrical member 2 through surface contact. Specifically, the receiving portion 30 is preferably configured to be able to support a region of the circumferential direction of the cylindrical member 2 that is equal to or greater than 90° and less than 180° through surface contact.

[0036] 2, the receiving portion 30 is configured so that the angle θ formed by an imaginary line VL1 extending along one circumferential end face and an imaginary line VL2 extending along the other circumferential end face is preferably equal to or greater than 90° and less than 180°. By providing the receiving portion 30 with this configuration, it becomes possible to prevent the cylindrical member 2 from being deformed by an external force applied from the second main body portion 12 when the cylindrical member 2 is pressed.

[0037] Furthermore, the receiving portion 30 is configured to be detachable from the main body portion 10. Specifically, the receiving portion 30 is formed with a size that allows it to fit into the recess 12a of the second main body portion 12 in the axial direction, and is attached to the main body portion 10 by fitting into the recess 12a of the second main body portion 12, and is configured to be detached from the main body portion 10 by removing the receiving portion 30 that is fitted into the recess 12a of the second main body portion 12.

[0038] 1 and 2, the receiving portion 30 has a positioning hole 31 near its center that penetrates from the support surface that supports the cylindrical member 2 to the surface opposite the support surface. Specifically, the positioning hole 31 is formed at a position that is 180° opposite to the position where the protrusion 22 of the pressing portion 20 presses the cylindrical member 2 when the receiving portion 30 supports a part of the cylindrical member 2 in the circumferential direction by surface contact. Note that the position where the positioning hole 31 is formed is not limited to this, and it may be formed at a position that is 120° offset from the position where the protrusion 22 of the pressing portion 20 presses the cylindrical member 2, for example. In this way, since the receiving portion 30 has the positioning hole portion 31, the position where the tubular member 2 is pressed by the protrusion portion 22 (the crimping marks already made) can be seen through the through hole 12b of the second main body portion 12 and the positioning hole portion 31, which has the advantage that when pressing a position different from the pressed position, it is easy to position the pressing position.

[0039] The material forming the receiving portion 30 does not need to have the same strength as the pressing portion 20, and for example, a material equivalent to SS400 can be used.

[0040] [Method for connecting cylindrical bodies using a cylindrical body crimping tool] The tubular body crimping tool 1 according to this embodiment is configured so that, with the fastening bolt 14a inserted through the insertion portion 14b, the nut 14c can be tightened around the fastening bolt 14a to clamp the first body portion 11 and the second body portion 12 in a direction that brings them closer to each other, and the pressing portion 20 can press the tubular member 2 to crimp and connect the tubular member 2 and the joint member 3. Furthermore, the tubular body crimping tool 1 according to this embodiment crimps and connects the tubular member 2 and the joint member 3 by pressing the tubular member 2 with the pressing portion 20 while the tubular member 2 is supported by the receiving portion 30.

[0041] Hereinafter, a method for connecting the first cylindrical member 2A and the second cylindrical member 2B using the cylindrical body crimping tool 1 as described above will be described in detail with reference to FIGS.

[0042] [Insertion process] First, as shown in FIG. 3, the joint member 3 is inserted into the first cylindrical member 2A and the second cylindrical member 2B, spanning the first cylindrical member 2A and the second cylindrical member 2B.

[0043] [First mounting step and first crimping step] Next, as shown in Fig. 3, the cylindrical body crimping tool 1 is attached to the outer periphery of the first cylindrical member 2A at a position where the first cylindrical member 2A and the joint member 3 overlap. Specifically, the receiving portion 30 is brought into surface contact with a portion of the circumference of the first cylindrical member 2A, and then, as shown in Fig. 4, the fastening bolt 14a of the second main body portion 12 is inserted into the insertion portion 14b provided at the tip of the first main body portion 11, thereby attaching the cylindrical body crimping tool 1 to the outer periphery of the first cylindrical member 2A. In this state, the receiving portion 30 supports a portion of the circumference of the first cylindrical member 2A.

[0044] After or in parallel with the first mounting step, a circumferential portion of the first tubular member 2A is pressed to crimp and connect the first tubular member 2A to the joint member 3. Specifically, as shown in Fig. 5, in a state in which the receiving portion 30 supports a circumferential portion of the first tubular member 2A by surface contact, the nut 14c is tightened onto the fastening bolt 14a, causing the protrusion 22 of the pressing portion 20 to press a portion opposite the supported portion, thereby crimping and connecting the first tubular member 2A to the joint member 3. Note that if crimping is insufficient by tightening only with the nut 14c, the screw member 4 can be threaded toward the second main body portion 12, causing the pressing portion 20 to advance further toward the second main body portion 12, thereby further pressing the tubular member 2.

[0045] Next, as shown in Fig. 6, the cylindrical body crimping tool 1 is attached to the outer periphery of the first cylindrical member 2A using a procedure similar to the above-described attachment procedure so that the receiving portion 30 supports another circumferential portion of the first cylindrical member 2A by surface contact. As shown in Fig. 6, with another circumferential portion of the first cylindrical member 2A supported by the receiving portion 30, the positioning hole 31 of the receiving portion 30 and the through-hole 12b of the second main body portion 12 are aligned with the pressed position (the crimped mark). This makes it easier to determine the pressing position. For example, it becomes possible to precisely shift the circumferential positions of the first crimping position and the second crimping position by 180 degrees.

[0046] 7, with the receiving portion 30 supporting another portion of the first cylindrical member 2A in the circumferential direction through surface contact, tightening the nut 14c causes the protrusion 22 of the pressing portion 20 to press the portion opposite the supported portion, thereby crimping and connecting the first cylindrical member 2A to the joint member 3. Note that if crimping is insufficient simply by tightening the nut 14c, the screw member 4 may be threaded toward the second main body portion 12, as in the case of pressing at the first location, thereby further advancing the pressing portion 20 and further pressing the cylindrical member 2.

[0047] [Second mounting step and second crimping step] Next, the same procedure as in the first crimping step is performed to crimp and connect the second cylindrical member 2B and the joint member 3. That is, by the same procedure as in the first mounting step, the cylindrical body crimping tool 1 is attached to the outer periphery of the second cylindrical member 2B, and in a state in which the receiving portion 30 supports a part of the circumferential direction of the second cylindrical member 2B by surface contact, the nut 14c and / or the screw member 4 is threaded toward the second main body portion 12, whereby the protrusion 22 of the pressing portion 20 presses the part facing the supported part, and the second cylindrical member 2B and the joint member 3 can be crimped and connected.

[0048] Furthermore, in a state where the receiving portion 30 supports another circumferential portion of the second tubular member 2B by surface contact using a procedure similar to that of the first mounting step, the nut 14c and / or the screw member 4 can be threaded toward the second main body portion 12, causing the protrusion portion 22 of the pressing portion 20 to press the portion opposite the support portion, thereby crimping and connecting the second tubular member 2B and the joint member 3.

[0049] In this way, by performing the insertion step, first attachment step, first crimping step, second attachment step, and second crimping step, the first tubular member 2A and the joint member 3 are connected, and the second tubular member 2B and the joint member 3 are connected, so that the first tubular member 2A and the second tubular member 2B can be connected via the joint member 3, as shown in Fig. 8. Furthermore, the tubular body crimping tool 1 according to this embodiment can be adapted to multiple types of tubular members 2 by changing the size of the tubular body crimping tool 1 according to the diameter of the tubular member 2, or by changing the size of the pressing portion 20 and / or the receiving portion 30 according to the diameter of the tubular member 2.

[0050] In the present embodiment, the first cylindrical member 2A and the joint member 3 are connected by crimping at two points, and the second cylindrical member 2B and the joint member 3 are connected by crimping at two points. However, this is not limited to this. The number of crimps of the first cylindrical member 2A and the second cylindrical member 2B to the joint member 3 may be one or three or more. When crimping at three or more points, it is preferable that the crimping positions are arranged at equal intervals (phase differences) in the circumferential direction. For example, when there are three crimping positions, it is preferable that the crimping positions are arranged at intervals of 120 degrees, and when there are four crimping positions, it is preferable that the crimping positions are arranged at intervals of 90 degrees.

[0051] [Advantages of the cylindrical body crimping tool according to this embodiment] Thus, the tubular body crimping tool 1 of this embodiment is a tubular body crimping tool 1 that crimps and connects a tubular member 2 and a joint member 3 that is inserted into the tubular member 2 or through which the tubular member is inserted, and is provided with a main body portion 10 that can surround the outer periphery of the tubular member 2 or joint member 3, and a pressing portion 20 that can press a portion of the circumferential direction of the tubular member 2 or joint member 3, and the main body portion 10 is provided with a first main body portion 11 that surrounds a portion of the tubular member 2 or joint member 3, a second main body portion 12 that surrounds other portions of the tubular member 2 or joint member 3, and a fastening portion 14 that brings the first main body portion 11 and the second main body portion 12 closer to or apart from each other, and is configured to be attachable to the outer periphery of the tubular member 2 or joint member 3 by the fastening portion 14.

[0052] With a tubular body crimping tool 1 having such a configuration, the fastening portion 14 brings the first main body portion 11 and the second main body portion 12 closer together, and the pressing portion 20 presses a circumferential portion of the tubular member 2 or the joint member 3, thereby crimping the tubular member 2 and the joint member 3. This has the significant advantage that no human power is required when crimping a tubular member, and the workload when crimping a tubular member with a large diameter or high strength can be reduced.

[0053] Furthermore, the cylindrical body crimping tool 1 having the above configuration is effective, for example, when assembling handrails at construction sites, etc. In other words, while handrails are generally assembled by connecting the ends of multiple cylindrical members by welding them all around, the cylindrical body crimping tool 1 having the above configuration eliminates the need for welding and can crimp the cylindrical member 2 and the joint member 3 simply by pressing the cylindrical member 2, making the connection work easier and improving work efficiency.

[0054] Furthermore, in the tubular body crimping tool 1 according to this embodiment, the fastening portion 14 includes a fastening bolt 14a provided at one of the tip ends of the first body portion 11 and the second body portion 12, an insertion portion 14b provided at the other tip end of the first body portion 11 and the second body portion 12, through which the fastening bolt 14a is inserted, and a nut 14c threaded onto the fastening bolt 14a. The tubular body crimping tool 1 having such a configuration allows the tubular member 2 and the joint member 3 to be crimped simply by tightening the nut 14c onto the fastening bolt 14a with an electric screwdriver or the like, which has the advantage of significantly reducing the workload when crimping a tubular member with a large diameter or high strength.

[0055] Furthermore, in the tubular body crimping tool 1 according to this embodiment, the pressing portion 20 has a protrusion 22 that presses the tubular member 2, and the protrusion 22 has a curved tip 22a. With the tubular body crimping tool 1 having this configuration, the stress applied to the tip 22a when pressing the tubular member 2 can be dispersed, and the durability of the protrusion 22 can be improved, which has the advantage that the tubular body crimping tool 1 can be used for a long period of time.

[0056] Moreover, the tubular body crimping tool 1 according to this embodiment further includes a receiving portion 30 capable of supporting, by surface contact, a portion of the tubular member 2 or the joint member 3 that faces the pressing portion 20, and is configured so that the tubular member 2 and the joint member 3 can be crimped and connected by pressing the tubular member 2 or the joint member 3 with the pressing portion 20 while the tubular member 2 or the joint member 3 is supported by the receiving portion 30. With the tubular body crimping tool 1 configured as described above, the receiving portion 30 supports a portion of the circumferential direction of the tubular member 2 or the joint member 3 by surface contact, so that when the pressing portion 20 presses the tubular member 2 or the joint member 3, the external force applied to the tubular member 2 from the second main body portion 12 can be dispersed, which has the advantage that the tubular member 2 and the joint member 3 can be crimped without significantly deforming the shape of the tubular member 2.

[0057] Furthermore, in the tubular body crimping tool 1 according to this embodiment, the receiving portion 30 has a positioning hole portion 31 that penetrates from the support surface that supports the tubular member 2 or the joint member 3 to the surface opposite the support surface. The tubular body crimping tool 1 having such a configuration has the advantage that the position where the tubular member 2 or the joint member 3 is pressed by the protrusion portion 22 (the crimping mark from the previous crimping) can be visually confirmed, making it easy to determine the position when pressing a position different from the pressed position.

[0058] Furthermore, in the tubular body crimping tool 1 according to this embodiment, the receiving portion 30 is configured to be able to support, by surface contact, an area of ​​90° or more and less than 180° in the circumferential direction of the tubular member 2 or the joint member 3. According to the tubular body crimping tool 1 having such a configuration, the receiving portion 30 is in surface contact with the tubular member 2 or the joint member 3 over a wide range, so that when the pressing portion 20 presses the tubular member 2 or the joint member 3, the external force applied to the tubular member 2 from the second main body portion 12 can be sufficiently dispersed, which has the advantage of preventing deformation of the tubular member 2.

[0059] [Variations] The tubular body crimping tool according to the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the technical concept of the present invention.

[0060] For example, in the above-described embodiment, the pressing portion 20 is provided on the first body portion 11, and the receiving portion 30 is provided on the second body portion 12. However, this is not limited to this. For example, as shown in FIG. 9, the pressing portion 20' may be provided on each of the first body portion 11' and the second body portion 12'. The configuration of such a cylindrical body crimping tool 1' and a cylindrical body connecting method will be described below using FIGS. 9 to 11. Note that the same components as those in the above-described embodiment will be denoted by the same reference numerals, or a description thereof will be omitted.

[0061] 9, the configuration of the tubular body crimping tool 1' differs from that of the above-described embodiment in that the first main body portion 11' includes a semicircular first holding portion 15 and a plate-shaped first extending portion 16 extending from the tip of the first holding portion 15, and the second main body portion 12' includes a semicircular second holding portion 17 and a plate-shaped second extending portion 18 extending from the tip of the second holding portion 17. The configuration of the tubular body crimping tool 1' also differs from that of the above-described embodiment in that the pressing portion 20' is formed of a screw member.

[0062] The first holding portion 15 and the second holding portion 17 are formed to have the same shape and size, and have through holes 11b' and 12b', respectively, at their circumferential centers, through which the pressing portion 20' can pass. The first holding portion 15 and the second holding portion 17 are configured to hold the pressing portion 20' in a state in which the pressing portion 20' passes through the through holes 11b' and 12b'.

[0063] The first extending portion 16 and the second extending portion 18 are formed to have the same shape and size. The second extending portion 18 is formed with a mounting hole 18a for mounting the fastening bolt 14, and the fastening bolt 14 is attached to the second main body portion 12' by passing through the mounting hole 18a. The first extending portion 16 is formed with an insertion hole (insertion portion 14b') for inserting the fastening bolt 14. The insertion portion 14b' and the mounting hole 18a are formed to have the same shape and size, and are formed as elongated holes extending in the extension direction of the first extending portion 16 and the second extending portion 18.

[0064] The pressing portion 20' includes a base 21' formed in a substantially T-shape and a protrusion 22' protruding in the axial direction from the base 21', with a tip 22a' of the protrusion 22' formed in a curved surface. The pressing portion 20' is configured to threadably pass through the through-hole 11b' of the first holding portion 15, so that the base 21' screws into the inner surface of the first holding portion 15 and is attached to the first main body portion 11'. Similarly, the pressing portion 20' is configured to threadably pass through the through-hole 12b' of the second holding portion 17, so that the base 21' screws into the inner surface of the second holding portion 17 and is attached to the second main body portion 12'.

[0065] 10, after inserting the joint member 3 into the tubular member 2 (insertion step), the tubular body crimping tool 1' is attached to the outer periphery of the tubular member 2 by inserting the fastening bolt 14 into the insertion portion 14b' and tightening the nut 14c with the first holding portion 15 and the second holding portion 17 surrounding the overlapping position of the tubular member 2 and the joint member 3 (first attachment step or second attachment step). Then, as shown in FIG. 11, after or in parallel with the attachment step, the nut 14c is tightened until the first extension portion 16 and the second extension portion 18 come into contact with each other, whereby the pressing portions 20' provided on the first holding portion 15 and the second holding portion 17 simultaneously press a part of the circumferential direction of the tubular member 2 and another part of the circumferential direction different from the part of the circumferential direction, thereby crimping and connecting the tubular member 2 and the joint member 3 (first crimping step or second crimping step). Furthermore, if tightening the nut 14c alone is insufficient to achieve sufficient clamping, the tubular member 2 may be further pressed by threading the pressing portion 20', which is respectively threaded onto the first holding portion 15 and the second holding portion 17, radially inward.

[0066] As in the above-described embodiment, the tubular member 2 may be inserted into the joint member 3 before being crimped.

[0067] According to the cylindrical body crimping tool 1' having such a configuration, the pressing portions 20' are provided on the first main body portion 11' and the second main body portion 12', respectively, and the cylindrical member 2 and the joint member 3 can be crimped at two points simultaneously, which has the advantage of not only reducing the workload during crimping but also improving work efficiency. Furthermore, during crimping, tightening the nut 14c until the first extension portion 16 and the second extension portion 18 come into contact serves as a measure of the degree of crimping, which has the advantage of allowing appropriate crimping regardless of the skill level of the worker.

[0068] In addition to the above-described modifications, the tubular body crimping tool according to the present invention can be modified in various ways without departing from the technical concept of the present invention. For example, in the above-described embodiment, the protrusions 22 are described as having the tips 22a formed in a curved shape, but this is not limited thereto, and the tips 22a of the protrusions 22 may have a shape other than a curved shape, such as a flat shape or a pointed shape.

[0069] Furthermore, in the above-described embodiment, the receiving portion 30 is described as having a positioning hole portion 31 that penetrates from the support surface that supports the tubular member 2 to the surface opposite the support surface, but this is not limited to this, and the receiving portion 30 may also be in a form that does not have a positioning hole portion 31.

[0070] Furthermore, in the above-described embodiment, the receiving portion 30 has been described as being configured to be able to support an area of ​​the tubular member 2 in the circumferential direction that is greater than or equal to 90° and less than 180° by surface contact, but this is not limited to this, and the receiving portion 30 may be configured to support any area of ​​the circumferential direction of the tubular member 2 by surface contact.

[0071] Furthermore, in the above-described embodiment, the pressing portion 20 is described as being configured to be detachable from the main body portion 10, but this is not limited to this, and the pressing portion 20 may be configured to be non-detachable from the main body portion 10.

[0072] Furthermore, in the above-described embodiment, the pressing portion 20 has been described as having a hardness greater than that of the tubular member 2 and the joint member 3, but this is not limited to this, and the pressing portion 20 may have the same hardness as the tubular member 2 and the joint member 3, or a hardness less than that of the tubular member 2 and the joint member 3, as long as the function of crimping the tubular member 2 and the joint member 3 is not impaired.

[0073] Furthermore, in the above-described embodiment, the receiving portion 30 is described as being configured to be detachable from the main body portion 10, but this is not limited to this, and the receiving portion 30 may be configured to be non-detachable from the main body portion 10.

[0074] Furthermore, in the above-described embodiment, the pressing portion 20 is described as being configured to be able to move back and forth relative to the first main body portion 11 in the direction along which the protrusion portion 22 protrudes, but this is not limited to this, and the pressing portion 20 may also be configured not to move.

[0075] It is clear from the claims that the above-mentioned modifications are included within the scope of the present invention. [Explanation of symbols]

[0076] 1: Cylindrical body crimping tool 2: Cylindrical member 2A: First cylindrical member 2B: Second cylindrical member 3: Joint material 4: Screw member 10: Main body 11: First main body part 11a: recess 11b: Through hole 12: Second main body part 12a: recess 12b: Through hole 13a:Shaft part 13b:Shaft part 14: Fastening part 14a: Fastening bolt 14b: Insertion part 14c: Nut 15: 1st holding part 16: 1st extension part 17:Second holding part 18:Second extension part 18a: Mounting hole 20: Pressing part 21: Base 21a: Screw receiving part 22:Protrusion 22a: Tip 30: Receiving part 31: Positioning hole VL1: Virtual line VL2: Virtual line

Claims

1. an insertion step of inserting a joint member into the first tubular member and the second tubular member across the first tubular member and the second tubular member, or inserting the first tubular member and the second tubular member into the joint member; a first mounting step of mounting a cylindrical body crimping tool on an outer periphery of the first cylindrical member or the joint member; a first crimping step of pressing a circumferential portion of the first cylindrical member or the joint member after or in parallel with the first attaching step to crimp and connect the first cylindrical member and the joint member; a second mounting step of mounting a cylindrical body crimping tool on an outer periphery of the second cylindrical member or the joint member; a second crimping step of pressing a circumferential portion of the second cylindrical member or the joint member after or in parallel with the second mounting step to crimp and connect the second cylindrical member and the joint member together; Equipped with the cylindrical body crimping tool has a main body portion capable of surrounding an outer periphery of the cylindrical member or the joint member, a pressing portion capable of pressing a circumferential portion of the cylindrical member or the joint member, and a receiving portion capable of supporting, by surface contact, a portion of the cylindrical member or the joint member that faces the pressing portion; The main body portion is a first main body portion surrounding a portion of the tubular member or the joint member; a second main body portion surrounding the cylindrical member or another portion of the joint member; a fastening portion that brings the first body portion and the second body portion closer to or apart from each other; and The cylindrical body crimping tool is configured to be attachable to the outer periphery of the cylindrical member or the joint member by the fastening portion, The cylindrical body crimping tool is configured to be able to crimp and connect the cylindrical member and the joint member by pressing the cylindrical member or the joint member with the pressing portion while the cylindrical member or the joint member is supported by the receiving portion. A cylindrical body connecting method characterized by the above.

2. the first crimping step includes supporting a circumferential portion of the first cylindrical member or the joint member by surface contact, and pressing a portion opposite the supported portion to crimp and connect the first cylindrical member and the joint member; In the second crimping step, a portion of the second cylindrical member or the joint member in the circumferential direction is supported by surface contact, and a portion opposite the supported portion is pressed to crimp and connect the second cylindrical member and the joint member.

2. The method for connecting cylindrical bodies according to claim 1.

3. the first crimping step further includes a step of pressing a portion of the first cylindrical member or the joint member opposite to the supported portion in a state in which the other portion in the circumferential direction of the first cylindrical member or the joint member is supported by surface contact, thereby crimping and connecting the first cylindrical member and the joint member, The second crimping step further includes a step of pressing a portion of the second cylindrical member or the joint member opposite to the supported portion in a state in which the second cylindrical member or the joint member is supported by surface contact, thereby crimping and connecting the second cylindrical member and the joint member.

3. The method for connecting cylindrical bodies according to claim 2.

4. A cylindrical body crimping tool that crimps and connects a cylindrical member and a joint member that is inserted into the cylindrical member or through which the cylindrical member is inserted, a main body portion capable of surrounding an outer periphery of the cylindrical member or the joint member; a pressing portion capable of pressing a circumferential portion of the cylindrical member or the joint member; a receiving portion that can support the cylindrical member or the joint member by surface contact at a portion that faces the pressing portion; Equipped with The main body portion is a first main body portion surrounding a portion of the tubular member or the joint member; a second main body portion surrounding the cylindrical member or another portion of the joint member; a fastening portion that brings the first body portion and the second body portion closer to or apart from each other; Equipped with The fastening portion is configured to be attachable to the outer periphery of the cylindrical member or the joint member, The cylindrical member and the joint member can be crimped and connected by pressing the cylindrical member or the joint member with the pressing portion while the cylindrical member or the joint member is supported by the receiving portion. A cylindrical body crimping tool characterized by the above.

5. The fastening portion is a fastening bolt provided on a tip end side of one of the first body portion and the second body portion; an insertion portion provided on the other tip end side of the first body portion and the second body portion, through which the fastening bolt is inserted; a nut threaded onto the fastening bolt; Equipped with 5. The tool for crimping a cylindrical body according to claim 4.

6. the pressing portion is provided on at least one of the first main body portion and the second main body portion, When the fastening bolt is inserted through the insertion portion, the nut is tightened around the fastening bolt, whereby the first body portion and the second body portion are tightened in a direction in which they approach each other, and the pressing portion presses the cylindrical member or the joint member, thereby crimping and connecting the cylindrical member and the joint member.

6. The tool for crimping a cylindrical body according to claim 5.

7. the pressing portion has a protrusion that presses the cylindrical member or the joint member, The protrusion has a curved tip.

7. The tool for crimping a cylindrical body according to claim 4, wherein the crimping tool is a tool for crimping a cylindrical body.

8. The receiving portion has a positioning hole portion that penetrates from a support surface that supports the tubular member or the joint member to a surface opposite the support surface.

7. The tool for crimping a cylindrical body according to claim 4, wherein the crimping tool is a tool for crimping a cylindrical body.

9. The receiving portion is configured to be able to support the cylindrical member or the joint member by surface contact in an area of ​​90° or more and less than 180° in the circumferential direction.

7. The tool for crimping a cylindrical body according to claim 4, wherein the crimping tool is a tool for crimping a cylindrical body.

10. The receiving portion is configured to be able to support the cylindrical member or the joint member by surface contact in an area of ​​90° or more and less than 180° in the circumferential direction.

9. The tool for crimping a cylindrical body according to claim 8.

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