Mechanical joint joining jig, mechanical joint joining method, structure, and structure construction method

Abstract

To provide a jig for mechanical joint bonding, a bonding method of a mechanical joint, a structure and a structure construction method, which dispense with processing on C-shaped ring members, and dispense with special work.SOLUTION: A jig 15 for mechanical joint bonding is used for bonding a mechanical joint 1 having annular grooves 11 formed in each of an outer peripheral surface of an inner joint 5 and an inner peripheral surface of an outer joint 7, and C-shaped ring members 13 which can be arranged so as to bridge over the inner joint 5 side and the outer joint 7 side in the annular grooves 11, and includes a first plate-like member 17, a second plate-like member 19, and a connection part 21 for connecting the first plate-like member 17 and the second plate-like member 19, wherein the second plate-like member 19 maintains a reduced-diameter state of the C-shaped ring by contact of the outer peripheral surface of the C-shaped ring member 13 in the reduced-diameter state, in a state of being connected to the first plate-like member 17 through the connection part 21, and the C-shaped ring can be made in an expandable-diameter state by releasing of the contact with the outer peripheral surface of the C-shaped ring member 13.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a mechanical joint joining jig used for joining a mechanical joint applied to a steel pipe pile or a steel pipe sheet pile, a joining method of a mechanical joint using the mechanical joint joining jig, a structure having a plurality of steel pipes connected by the joining method, and a construction method of the structure. [Background technology]

[0002] Conventionally, steel pipe piles or steel pipe sheet piles have been joined mainly by on-site welding, but in recent years, due to factors such as a decrease in skilled workers, shortening construction periods, and quality control, the use of mechanical joints for joining has been increasing.

[0003] As a mechanical joint, for example, Patent Document 1 discloses a columnar body connection structure using a C-shaped ring member (hereinafter, referred to as a "C-shaped ring"). The columnar connection structure disclosed in Patent Document 1 is a columnar body connection structure in which a pair of an inner column portion (11) and an outer pipe portion (21) are provided at one end of a first columnar body (1) and one end of a second columnar body (2), and the inner column portion (11) and the outer pipe portion (21) are connected to each other. At least one annular outer groove portion (12) is provided on the outer peripheral surface of the inner column portion (11), and at least one annular inner groove portion (22) is provided on the inner peripheral surface of the outer pipe portion (21). Furthermore, a ring-shaped member (3) is provided, the diameter of which can be freely changed and which can be accommodated in a state where it is retracted from the entrance of the outer groove portion (12) or the inner groove portion (22) to the back. With the inner column portion (11) fitted into the outer pipe portion (21), the ring-shaped member (3) is interposed between the outer groove portion (12) and the inner groove portion (22) and is held in an engaged state with both (see claim 2 of Patent Document 1).

[0004] In Patent Document 1, embodiment 2-2 describes an aspect in which a C-ring as a ring-shaped member is housed in an inner column in a contracted state, and the contracted state of the C-ring is released in a state in which the inner column is fitted into an outer pipe. In this aspect, both ends of the C-ring are connected with a connecting member made of thermoplastic resin to make the C-ring in a contracted state, and the connecting member is heated and melted in a state in which the inner column is fitted into the outer pipe. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 11-36285 Summary of the Invention [Problem to be solved by the invention]

[0006] The method disclosed in Patent Document 1 requires processing of the C-ring, and also requires a special operation of heating and melting. The present invention has been made to solve such problems, and aims to provide a jig for joining mechanical joints that is used to join mechanical joints equipped with a C-shaped ring member that can be arranged so as to straddle the inner joint side and the outer joint side, and that does not require any processing of the C-shaped ring member or any special operations. Another object of the present invention is to provide a method for joining a mechanical joint using the mechanical joint joining jig, a structure having a plurality of steel pipes connected by the joining method, and a method for constructing the structure. [Means for solving the problem]

[0007] (1) A jig for joining a mechanical joint according to the present invention is used for joining a mechanical joint, the mechanical joint having annular grooves formed on an outer peripheral surface of an inner joint and an inner peripheral surface of an outer joint so as to face each other in a joint assembly completed state, the mechanical joint including a C-ring member that can be stored in the annular groove of the inner joint and can be arranged within the annular groove so as to straddle the inner joint side and the outer joint side in the assembly completed state, a first plate-shaped member disposed in the annular groove of the inner joint, a second plate-shaped member disposed opposite the first plate-shaped member with the C-shaped ring member interposed therebetween, and a connecting portion disposed in a gap between ends of the C-shaped ring members to connect the first plate-shaped member and the second plate-shaped member, The second plate-like member is The connection Department When the C-ring member is connected to the first plate-like member via a groove, the outer circumferential surface of the C-ring member in a reduced diameter state comes into contact with the C-ring member. Materials The C-ring member is then released from its contact with the outer circumferential surface of the C-ring member to maintain the reduced diameter state. Materials Can be expanded To This is what has been made possible.

[0008] (2) In addition, in the above (1), the linking Part One end of the first plate-like member is connected to the first plate-like member. Part The other end and the second plate-like member are separable, or the connection Part The other end is connected to the second plate-like member, and the connecting Part One end and the first plate-like member are separable.

[0009] (3) In the above (1), the second plate-like member is To the department The C-ring member is attached so as to be rotatable, and is configured so that, by rotating, it can be brought into contact with the C-ring member or into a non-contact state.

[0010] (4) In the above-mentioned (1), the first plate-like member is elongated with one width being wider and the other width being narrower, the narrower width being narrower than the gap in the natural state of the C-shaped ring member, and the wider width being wider than the gap, The second plate-like member is characterized in that it is configured so as to be able to be placed in contact with and detached from the first plate-like member.

[0011] (5) A method for joining a mechanical joint using the mechanical joint joining jig according to any one of (1) to (4) above, 2. C-shaped ring Materials The C-ring is stored in the annular groove of the inner joint so as not to protrude from the annular groove. Materials a step of reducing the diameter of the inner joint and maintaining the reduced diameter state by the mechanical joint joining jig; a step of assembling the inner joint and the outer joint to a completed assembly state; and a step of accessing the second plate-like member through an access hole provided in the outer joint so that the second plate-like member is attached to the C-ring. Materials By preventing the C-ring from contacting the Materials Release the contracted state of the C-ring Materials and placing the inner joint side and the outer joint side in the annular groove to complete the joining.

[0012] (6) Furthermore, the structure according to the present invention includes a plurality of steel pipes connected by the joining method of the mechanical joint described in (5) above.

[0013] (7) Furthermore, the construction method of the structure of the present invention is a construction method of the structure described in (6) above, in which, while restraining the axial position of one of the steel pipes with fittings to be connected, the other steel pipe with fitting is aligned with the one of the steel pipes with fittings and inserted into it. Effect of the Invention

[0014] According to the mechanical joint joining jig of the present invention, no processing of the C-shaped ring member is required, and no special operations are required, and joining operations of a mechanical joint equipped with a C-shaped ring member can be performed. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is an explanatory diagram of a mechanical joint joining jig according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is an explanatory diagram of a mechanical joint joined using the mechanical joint joining jig of the present invention. [Diagram 3] FIG. 1 is an explanatory diagram (part 1) of a method for joining a mechanical joint using a jig for joining a mechanical joint. [Figure 4] FIG. 2 is an explanatory diagram (part 2) of a method for joining a mechanical joint using a jig for joining a mechanical joint. [Diagram 5] FIG. 6 is an explanatory diagram of a mechanical joint joining jig according to a second embodiment of the present invention. [Figure 6] FIG. 11 is an explanatory diagram (part 1) of a mechanical joint joining jig according to embodiment 3 of the present invention. [Figure 7] FIG. 11 is an explanatory diagram (part 2) of a mechanical joint joining jig according to the third embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] [Embodiment 1] Before describing the mechanical joint joining jig according to this embodiment, a mechanical joint in which the mechanical joint joining jig is used will be described with reference to FIG.

[0017] The mechanical joint 1 that is the subject of the present invention has a tubular inner joint 5 provided at the end of a steel pipe 3, and a tubular outer joint 7 provided at the end of another steel pipe 3 and joined to the inner joint 5, as shown in FIG. 2. A step portion 9 is formed on the base end side of the inner joint 5, and when the inner joint 5 and the outer joint 7 are assembled (see Figure 2 (b)), the tip portion of the outer joint 7 abuts against the step portion 9, completing the assembly.

[0018] An annular groove 11 is formed on each of the outer peripheral surface of the inner joint 5 and the inner peripheral surface of the outer joint 7, and these annular grooves 11 are arranged so as to face each other when the joints are fully assembled. Note that, although the annular groove 11 shown in Fig. 2 has one stage, the annular groove 11 in the mechanical joint 1 that is the subject of the present invention is not limited to one stage and may have multiple stages.

[0019] The inner joint 5 also includes a C-shaped ring member 13 that can be stored in the annular groove 11 of the inner joint 5 so as not to hinder the assembly of the inner joint 5 to the outer joint 7. This C-shaped ring member 13 is disposed in the annular groove 11 so as to straddle the inner joint 5 side and the outer joint 7 side when the assembly of the joints is completed. Therefore, the C-shaped ring member 13 can be reduced in diameter by applying an external force from a natural state, and becomes in a state in which it can be stored in the annular groove 11 of the inner joint 5, as shown in FIG. 2(a). Then, by releasing the reduced diameter state, that is, by removing the external force that maintains the reduced diameter state, the C-shaped ring member 13 expands in diameter and is disposed in the annular groove 11 so as to straddle the inner joint 5 side and the outer joint 7 side.

[0020] A mechanical joint joining jig 15 (hereinafter simply referred to as "jig 15") used for joining the mechanical joint 1 as described above will be described with reference to FIG. FIG. 1 shows the vicinity of the end of the C-shaped ring member 13 arranged in the annular groove 11 of the inner joint 5, with FIG. 1(a) showing the C-shaped ring member 13 in an expanded state (natural state) and FIG. 1(b) showing the C-shaped ring member 13 in a state in which the diameter of the C-shaped ring member 13 has been reduced and the reduced state is maintained by a jig 15.

[0021] The jig 15 of this embodiment includes a first plate-shaped member 17, a second plate-shaped member 19, and a connecting portion . The first plate-shaped member 17 is disposed in the annular groove 11 of the inner joint 5. The second plate-shaped member 19 is disposed opposite the first plate-shaped member 17 with the C-shaped ring member 13 in between. The connecting portion 21 is disposed in the gap between the ends of the C-shaped ring member 13 to connect the first plate-shaped member 17 and the second plate-shaped member 19.

[0022] In this embodiment, the first plate-like member 17 and the connecting portion 21 are integrally connected, and the connecting portion 21 and the second plate-like member 19 are detachably joined, for example, by bolts 23. Therefore, the second plate-like member 19 and the connecting portion 21 are formed with bolt holes 24 for bolt joining. However, the jig 15 of the present invention is not limited to this, and the connecting portion 21 and the second plate-shaped member 19 may be integrally connected and the connecting portion 21 and the first plate-shaped member 17 may be detachable, or the connecting portion 21 and the first plate-shaped member 17 and the second plate-shaped member 19 may all be detachable.

[0023] As shown in FIG. 2, the second plate-shaped member 19 is connected to the first plate-shaped member 17 via the connecting portion 21, and the outer circumferential surface of the C-shaped ring member 13 in a reduced diameter state comes into contact with the second plate-shaped member 19 to form a C-shaped ring. Materials The reduced diameter state can be maintained. Furthermore, by releasing the contact with the outer circumferential surface of the C-shaped ring member 13, that is, by separating the second plate-like member 19 and the connecting portion 21 as shown in FIG. 1(a), the C-shaped ring member 13 can be made to have an expandable diameter.

[0024] The jig 15 configured as above is used as follows. The first plate member 17 with the C-shaped ring member 13 and the connecting portion 21 connected is placed in the annular groove 11 of the inner joint 5. The C-shaped ring member 13 is compressed until its end abuts against the connecting portion 21, and in this state, the second plate member 19 is joined to the connecting portion 21. At this time, the C-shaped ring member 13 tries to expand in diameter due to its own elasticity, but since its end abuts against the inner surface of the second plate member 19, it cannot expand any further and the reduced diameter state is maintained. This allows the C-ring member 13 to be stored in the annular groove 11 of the inner joint 5 in a diameter-reduced state.

[0025] In this manner, the jig 15 of the present embodiment is a mechanism for maintaining the reduced diameter state by utilizing the force tending to expand the diameter of the C-ring member 13, and therefore does not require a large force to maintain the reduced diameter state, and an extremely simple structure is sufficient.

[0026] Next, a method for joining the mechanical joint 1 using the jig 15 of this embodiment configured as described above will be described with reference to FIG. The C-shaped ring member 13 is stored in the annular groove 11 of the inner joint 5, and the diameter of the C-shaped ring member 13 is reduced so that it does not protrude from the annular groove 11, and the reduced diameter state is maintained by a jig 15 (see Figure 3(a)).

[0027] More specifically, the first plate member 17 is placed in the annular groove 11 of the inner joint 5, and then the C-shaped ring member 13 is placed in the annular groove 11. At this time, the gap between the ends of the C-shaped ring member 13 is positioned at the center of the first plate member 17. Next, the C-shaped ring member 13 is compressed until its end abuts against the connecting portion 21, and in this state, the second plate-shaped member 19 is joined to the connecting portion 21. As a result, the end of the C-shaped ring member 13 abuts against the inner surface of the second plate-shaped member 19, maintaining the reduced diameter state.

[0028] Next, the inner joint 5 and the outer joint 7 are assembled to complete the assembly (see FIG. 3(b)). More specifically, the inner joint 5 is inserted into the outer joint 7, and the tip of the outer joint 7 is brought into contact with the step portion 9 of the inner joint 5 to complete the assembly.

[0029] Thereafter, the second plate member 19 is accessed through an access hole 25 (see FIG. 4) provided in the outer joint 7 so that the second plate member 19 does not come into contact with the C-shaped ring member 13, thereby releasing the reduced diameter state of the C-shaped ring member 13. Specifically, as shown in FIG. 4, the bolt 23 joining the second plate member 19 and the connecting portion 21 is accessed through the access hole 25 and removed, and the bolt 23 is then removed, thereby releasing the reduced diameter state of the C-shaped ring member 13. When the reduced diameter state of the C-shaped ring member 13 is released, the C-shaped ring member 13 expands to its natural state due to its elasticity and is positioned so as to straddle both the inner joint 5 and the outer joint 7 and the annular groove 11, thereby completing the joining of the mechanical joint 1.

[0030] As described above, by using the jig 15 of this embodiment, joining of the mechanical joint 1 using the C-ring member 13 can be carried out extremely easily.

[0031] In addition, the mechanical joint 1 shown in Figures 2 and 3 is an example in which the inner joint 5 is arranged on the upper side and the outer joint 7 is arranged on the lower side, but the inner joint 5 may be arranged on the lower side and the outer joint 7 may be arranged on the upper side.

[0032] [Embodiment 2] The jig 26 of embodiment 1 is configured to release the abutment between the second plate-shaped member 19 and the outer peripheral surface of the C-shaped ring member 13, and is configured to remove the second plate-shaped member 19 together with the connecting portion 21 by either removing the second plate-shaped member 19 from the connecting portion 21 or separating the connecting portion 21 from the first plate-shaped member 17. 5, in the jig 26 of the second embodiment, the second plate-shaped member 27 is composed of two small plate materials 27a and 27b, and each of the plate materials 27a and 27b is rotatably attached to the connecting portion 21. By rotating the plate materials 27a and 27b, the jig 26 can be placed in a state where it is in contact with the C-shaped ring member 13 (see FIG. 5(b)) or in a state where it is not in contact with the C-shaped ring member 13.

[0033] According to the jig 26 of the present embodiment, when maintaining the contracted state of the C-shaped ring member 13 or releasing the contracted state, it is only necessary to rotate the plate members 27a, 27b, making the operation extremely simple and efficient.

[0034] After the joining of the mechanical joint 1 is completed, it may be necessary to release the joined state of the mechanical joint 1 and separate the joined steel pipe 3 for convenience of construction. In this case, if there is this access hole 25 and another ring access hole 25 of the outer joint 7, the C-shaped ring member 13 may be forcibly deformed in the diameter-reducing direction from the access hole 25 and, in this state, the plate members 27a and 27b may be rotated to abut against the outer peripheral surface of the C-shaped ring member 13. As a result, the C-shaped ring member 13 maintains the diameter-reduced state, and the C-shaped ring member 13 is stored in the annular groove 11 of the inner joint 5, and the joining of the inner joint 5 and the outer joint 7 is released.

[0035] In this way, the jig 26 of the present embodiment makes it easy to release a joint that has been joined once. In contrast, in the case of Patent Document 1, where the ends of the C-shaped ring members are connected and the diameter is reduced using a connecting member that is heated and melted, the joint that has been joined once cannot be released. In order to facilitate the operation of disconnecting the joint, it is preferable to provide a ring access hole 25 in addition to the access hole 25 described above for applying a forcing force to reduce the diameter of the C-ring member 13.

[0036] [Embodiment 3] In the first and second embodiments, the gap between the first plate-shaped member 17 and the second plate-shaped member 19, 27 cannot be freely adjusted. Therefore, in order to reliably hold the reduced diameter state of the C-shaped ring member 13 by the second plate members 19, 27, the distance between the first plate member 17 and the second plate members 19, 27 must be set with high precision.

[0037] Furthermore, in the first and second embodiments, the relationship between the size of the first plate-shaped member 17 and the gap between the ends of the C-shaped ring member 13 in their natural state (hereinafter simply referred to as "natural state gap C") is not specified. Therefore, in the case where the natural state gap C of the C-shaped ring member 13 is narrow, in the case of embodiment 1, the first plate-shaped member 17 and the connecting portion 21 integrated together must first be placed in the annular groove 11 of the inner joint 5, then the C-shaped ring member 13 must be installed, and then the second plate-shaped member 19 must be fixed with bolts. However, the first plate-like member 17 and the connecting portion 21 are first arranged, and then the C-shaped ring member 13 is installed. Part 2 However, attaching the second plate-shaped member 19 to the first plate-shaped member 1 requires delicate work, which causes a problem of poor workability. Therefore, the present embodiment is intended to solve these problems.

[0038] The third embodiment will be described with reference to FIG. 6, a mechanical joint joining jig 29 (hereinafter simply referred to as "jig 29") of the third embodiment includes a rectangular first plate-shaped member 31, a threaded rod 33 as a connecting part, a second plate-shaped member 35 having the same shape as the first plate-shaped member 31, and a nut 37 that screws onto the threaded rod 33. Each component will be described in detail below. FIG. 6 shows a case where the gap C of the C-shaped ring member 13 in its natural state is narrow.

[0039] <First plate-shaped member> The first plate-shaped member 31 is rectangular, with the length of the short side being shorter than the natural state gap C of the C-shaped ring member 13, and the length of the long side being longer than the natural state gap C and shorter than the groove width. Therefore, when the short sides of the first plate-shaped member 31 are oriented in the circumferential direction, the first plate-shaped member 31 fits within the groove width and can pass through the natural state gap C (see FIG. 6(a)).

[0040] It should be noted that a rectangle is one form of an elongated shape having a wider width on one side and a narrower width on the other side, and the length of the shorter side corresponds to the narrower width, and the length of the longer side corresponds to the wider width.

[0041] <Threaded rod> The threaded rod 33 corresponds to a connecting portion of the present invention that connects the first plate-shaped member 31 and the second plate-shaped member 35. The diameter of the threaded rod 33 is smaller than the short side of the first plate-shaped member 31. The threaded rod 33 and the first plate-like member 31 may be integrated, or one end of the threaded rod 33 may be screwed into a threaded hole formed in the first plate-like member 31 to be fixed. The other end of the threaded rod 33 is formed with a thread (not shown) into which a nut 37 is screwed. The threaded rod 33 may be threaded over its entire length, or may be threaded only at the portion that screws into the first plate-shaped member 31 or the nut 37. The length of the threaded rod 33 must be long enough to sandwich the C-ring member 13 between the first plate member 31 and the second plate member 35 and further to screw in the nut 37, as shown in FIG. 6(c).

[0042] <Second plate-shaped member> The second plate-shaped member 35 has the same rectangular outer shape as the first plate-shaped member 31. As shown in Fig. 6, the second plate-shaped member 35 has an insertion hole 39 through which the threaded rod 33 can be inserted (see Fig. 6(a)). By inserting the threaded rod 33 into the insertion hole 39, the second plate-shaped member 35 can be moved closer to or closer to the first plate-shaped member 31, that is, the second plate-shaped member 35 can be brought into contact with or separated from the first plate-shaped member 31.

[0043] <Nut> The nut 37 has the function of moving the second plate-shaped member 35 towards the first plate-shaped member 31 and pressing it against the C-ring member 13 by screwing it onto the other end of the threaded rod 33 and tightening it.

[0044] Next, a method of using the jig 29 of this embodiment configured as described above will be described. First, the C-shaped ring member 13 is placed in the annular groove 11 of the inner joint 5. Next, with the jig 29 assembled, the first plate-shaped member 31 and the second plate-shaped member 35 are oriented so that their short sides face the circumferential direction of the C-shaped ring member 13 (see FIG. 6(a)), and the first plate-shaped member 31 is moved radially inward of the inner joint 5 to pass through the natural state gap C. In addition, Figure 6 (a) shows the second plate-shaped member 35 and the nut 37 separated from the threaded rod 33, but this is to illustrate that each member is separable. When installing the jig 29, it is preferable to leave them in an assembled state (see Figure 6 (b)).

[0045] Next, the jig 29 is rotated (see FIG. 6(b)), and rotated 90° (see FIG. 6(c)) so that the long sides of the first plate member 31 and the second plate member 35 face the circumferential direction of the C-ring member 13. Next, the diameter of the C-shaped ring member 13 is reduced, and both ends of the C-shaped ring member 13 are brought close enough to abut against the threaded rod 33. In this state, by tightening the nut 37, the second plate-like member 35 is pressed against the C-shaped ring member 13, thereby reliably maintaining the reduced diameter state of the C-shaped ring member 13.

[0046] In the first and second embodiments, the distance between the first plate-shaped member 31 and the second plate-shaped member 35 cannot be actively adjusted. Therefore, the first plate-shaped member 31 and the second plate-shaped member 35 have a preset distance, and the C-shaped ring member 13 is inserted therebetween, and the reduced diameter state is maintained by frictional resistance generated when the C-shaped ring member 13 tries to expand. In this regard, in the present embodiment, by tightening the nut 37, the second plate-shaped member 35 can be actively pressed against the C-shaped ring member 13, so that the reduced diameter state of the C-shaped ring member 13 can be more reliably maintained. Furthermore, when releasing the diameter-reduced state of the C-ring member 13, it is only necessary to loosen the nut 37, which provides excellent operability.

[0047] Furthermore, in this embodiment, even if the natural state gap C of the C-shaped ring member 13 is narrow, the jig 29 can be installed in an assembled state. That is, the jig 29 in the assembled state can be installed by a simple operation of inserting the jig 29 in the natural state gap C, rotating the jig 29, and tightening the nut 37, which provides excellent workability.

[0048] When removing the jig 29, the nut 37 is loosened to set the gap at the end of the C-shaped ring member 13 to the natural state gap C, the jig 29 is rotated 90 degrees so that the short side faces circumferentially, and the jig 29 is pulled out from the natural state gap C.

[0049] In addition, when the natural state gap C of the C-shaped ring member 13 is wide and the first plate-shaped member 31 and the second plate-shaped member 35 can pass through the natural state gap C while keeping the long sides facing circumferentially (see Figure 7(a)), the following work process can be performed. The C-shaped ring member 13 is placed in the annular groove 11 of the inner joint 5, and in a state in which the jig 29 is assembled, the first plate-shaped member 31 and the second plate-shaped member 35 are placed in the natural state gap C of the C-shaped ring member 13 with their long sides facing the circumferential direction. In this state, the diameter of the C-shaped ring member 13 is reduced, and the nut 37 is tightened (see FIG. 7(b)). In addition, Figure 7(a) shows the second plate-shaped member 35 and the nut 37 separated from the threaded rod 33. However, this is to illustrate that each member is separable, as in Figure 6(a), and it is preferable to install the jig 29 in an assembled state.

[0050] In the above third embodiment, the first plate-shaped member 31 and the second plate-shaped member 35 have the same shape, but they do not need to have the same shape. Furthermore, when the natural state gap C of the C-shaped ring member 13 is narrow, in order to enable installation of the jig 29 in an assembled state, it is sufficient that only the first plate-shaped member 31 can pass through the natural state gap C. Therefore, it is sufficient that the short side of the first plate-shaped member 31 is shorter than the natural state gap C of the C-shaped ring member 13, and the short side of the second plate-shaped member 35 may be longer than the natural state gap C.

[0051] Furthermore, in the third embodiment described above, the first plate-shaped member 31 is rectangular, but the first plate-shaped member 31 is not limited to a rectangular shape, and may be, for example, an elliptical shape. In other words, the first plate-shaped member is elongated with one width being wider and the other width being narrower, with the narrower width being narrower than the natural state gap C of the C-shaped ring member and the wider width being wider than the natural state gap C.

[0052] In addition, in the above embodiment 3, nuts 37 are used, but if the insertion hole 39 provided in the second plate-shaped member 35 is a female thread that screws into the threads of the threaded rod 33, nuts 37 can be eliminated. It is more preferable to eliminate the need for the nut 37 since this makes it easier for the jig 29 to fit within the annular groove 11 . Furthermore, in the above-mentioned embodiment 3, the threaded rod 33 is exemplified as the connecting part, but the connecting part of the present invention is not limited to the threaded rod 33 and may be, for example, a rectangular part having a screw protruding from the upper end thereof, such as connecting part 21 in embodiment 1. In other words, regardless of the shape of the connecting part, it is sufficient that the second plate-like member 35 can be installed so as to be detachable from the first plate-like member 31.

[0053] In the above description of embodiments 1 to 3, the C-shaped ring member 13 is an inclined type C-shaped ring member 13 that is inclined with respect to the axis of the joint as shown in FIG. 2. However, the C-shaped ring member 13 of the present invention is not limited to this, and may be a horizontal type C-shaped ring member in which the C-shaped ring member is perpendicular to the axis of the joint, as disclosed in Patent Document 1. In the case of an inclined C-ring member, the C-ring member itself functions as an anti-reversal mechanism after the joint is joined, so in this respect it is preferable that there is no need to provide a separate anti-reversal mechanism. The mechanical joint joining jig 26 of the present invention can be applied to both water-type and inclined-type C-ring members.

[0054] By connecting a plurality of steel pipes 3 using the joining method of the mechanical joint 1 as described above, structures such as piles and steel pipe sheet piles can be constructed. The method of constructing such a structure involves restraining the axial position of one of the steel pipes with fittings to be connected, while aligning the other steel pipe with fitting with the one of the steel pipes with fittings and inserting and fitting them together. [Explanation of symbols]

[0055] 1 Mechanical coupling 3 Steel pipe 5 Inner joint 7 Outer joint 9 Step 11 Annular groove 13 C-ring component 15 Mechanical joint joining jig (jig) (embodiment 1) 17 First plate-shaped member 19 Second plate-shaped member 21 Connecting part 23 Volts 24 Bolt Holes 25 Access hole 26 Mechanical joint joining jig (jig) (embodiment 2) 27 Second plate-shaped member 27a, b Board material 29 Mechanical joint joining jig (jig) (embodiment 3) 31 First plate-like member (third embodiment) 33 Threaded Rod 35 Second plate-like member (third embodiment) 37 Nut 39 Insertion hole

Claims

1. A jig for joining a mechanical joint used to join a mechanical joint, the jig including annular grooves formed on an outer peripheral surface of an inner joint and an inner peripheral surface of an outer joint so as to face each other in a joint assembly completed state, the jig being provided with a C-ring member that can be stored in the annular groove of the inner joint and can be arranged within the annular groove so as to straddle the inner joint side and the outer joint side in the assembly completed state, a first plate-shaped member disposed in the annular groove of the inner joint, a second plate-shaped member disposed opposite the first plate-shaped member with the C-shaped ring member interposed therebetween, and a connecting portion disposed in a gap between ends of the C-shaped ring members to connect the first plate-shaped member and the second plate-shaped member, The second plate-like member is A mechanical joint joining jig in which the C-shaped ring member is in a reduced diameter state and abuts against the outer circumferential surface of the C-shaped ring member when connected to the first plate-shaped member via the connecting portion, thereby maintaining the reduced diameter state of the C-shaped ring member, and the C-shaped ring member can be made to be in an expandable diameter state by releasing the abutment with the outer circumferential surface of the C-shaped ring member.

2. A mechanical joint joining jig as described in claim 1, wherein one end of the connecting portion is connected to the first plate-shaped member and the other end of the connecting portion is separable from the second plate-shaped member, or the other end of the connecting portion is connected to the second plate-shaped member and one end of the connecting portion is separable from the first plate-shaped member.

3. The mechanical joint joining jig according to claim 1, wherein the second plate-shaped member is rotatably attached to the connecting portion and is configured so that it can be rotated to be in a state of abutment with the C-shaped ring member or in a state of not abutting with the C-shaped ring member.

4. the first plate-like member is elongated with one width being wider and the other width being narrower, the narrower width being narrower than the gap in the natural state of the C-shaped ring member, and the wider width being wider than the gap, The mechanical joint joining jig according to claim 1, wherein the second plate-like member is configured so as to be detachably attached to the first plate-like member.

5. A method for joining a mechanical joint using the mechanical joint joining jig according to any one of claims 1 to 4, a step of storing the C-shaped ring member in the annular groove of the inner joint, reducing the diameter of the C-shaped ring member so that it does not protrude from the annular groove, and maintaining the reduced diameter state by the mechanical joint joining jig; a step of combining the inner joint and the outer joint to complete the combination; and a step of releasing the reduced diameter state of the C-shaped ring member by accessing the second plate-shaped member through an access hole provided in the outer joint and preventing the second plate-shaped member from contacting the C-shaped ring member, and disposing the C-shaped ring member in the annular groove so as to straddle the inner joint side and the outer joint side, to complete the joining.

6. A structure comprising a plurality of steel pipes connected by the joining method for a mechanical joint according to claim 5.

7. 7. A method for constructing a structure as described in claim 6, in which, while restraining the axial position of one of the jointed steel pipes to be connected, the other jointed steel pipe is aligned with the one jointed steel pipe and inserted and fitted into it.

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