Fitting and removal jigs for joints, insertion and fitting methods for mechanical joints, and removal methods.

Abstract

This invention provides a fitting and removal jig for pin fittings and box fittings, a method for inserting and fitting mechanical fittings, and a method for removing mechanical fittings, enabling fitting and removal of pin fittings and box fittings without requiring special processing of the C-ring member. [Solution] The fitting and removal jig 1 according to the present invention is a fitting and removal jig 1 used when inserting and / or removing a mechanical fitting comprising a tubular pin fitting 53, a box fitting 55, and a C-shaped ring member 57, and comprises a first member 3 and a second member 5 that are movable toward and toward each other, a guide member 7 that guides the first member 3 and the second member 5 to move toward and toward each other, and a movable member 9 that moves the first member 3 and the second member 5 toward and toward each other, wherein the first member 3 and the second member 5 comprise a main body portion 11A, 11B, a pressing and fixing portion 13A, 13B, and a ring diameter expanding portion 15A, 15B.

Description

Technical Field

[0001] A fitting / removing jig for mechanical joints used during insertion / fitting and / or removal of a tubular pin joint, a box joint into which the pin joint is inserted and fitted, and a C-ring member, and an insertion / fitting method and a removal method for mechanical joints using the fitting / removing jig for joints are disclosed.

Background Art

[0002] As a prior art using a C-ring member that elastically deforms to maintain the fitting state of both when the pin joint is inserted into the box joint, for example, "Columnar body and columnar body connection structure" disclosed in Patent Document 1 can be cited. In a joint member using a C-ring member, the C-ring member is disposed in a ring groove of the pin joint or the box joint, and after the pin joint is inserted into the box joint, it is necessary to dispose it so as to span the ring grooves of both joints formed in the pin joint and the box joint. In this regard, in Patent Document 1, a C-ring member is housed in a ring groove of a pin joint by reducing the diameter with a connection member made of a heat-melting thermoplastic resin, and after the pin joint is inserted into the box joint, the connection member is heated and melted to release the reduced-diameter state.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the case of a method of reducing the diameter of a C-ring member using a connection member made of a thermoplastic resin and releasing the reduced-diameter state of the C-ring member by heat melting as in Patent Document 1, there are the following problems. First, the connecting member must be attached to the C-ring member in such a way that the C-ring member maintains a reduced diameter state that results in a predetermined diameter, which is a complicated process. Furthermore, after the pin joint and box joint are fitted together by the C-ring member, removing the pin joint and box joint requires expanding the diameter of the C-ring member by some means and then inserting a plastic resin into the notch of the C-ring member, making the process extremely complicated.

[0005] The present invention was made to solve the above problems, and aims to provide a fitting and removal jig for fitting pin fittings and box fittings, a method for inserting and fitting mechanical fittings, and a method for removing mechanical fittings, which enable fitting and removal of pin fittings and box fittings without requiring special processing of the C-ring member. [Means for solving the problem]

[0006] (1) The fitting and removal jig according to the present invention is used when inserting and / or removing a mechanical fitting comprising a tubular pin fitting, a box fitting into which the pin fitting is inserted and fitted, and a C-shaped ring member, The outer circumferential surface of the pin joint and the inner circumferential surface of the box joint each have one or more annular grooves formed to face each other when the insertion is complete. The C-shaped ring member is configured to expand elastically so as to be able to be stored in the annular groove of the box joint without obstructing the insertion of the pin joint into the box joint, and to be positioned within the annular groove so as to straddle both the pin joint side and the box joint side when the expanded state is released after insertion is complete. An opening is formed on the outer surface of the box joint that allows access to the annular groove. The aforementioned fitting and removal jig is, It comprises a first member and a second member that can move toward and toward each other, a guide member that guides the first member and the second member toward and toward each other, and a movable member that moves the first member and the second member toward and toward each other. The first member and the second member are The device comprises a main body to which the guide member and the movable member are attached, a pressing and fixing part provided on the tip side of the main body to fix the joint fitting and removal jig to the box joint by pressing it against the wall of the opening, and a ring diameter expanding part provided on the tip side of the pressing and fixing part to expand the diameter of the ring member by pushing open the notch in the C-shaped ring member. The C-shaped ring member is expanded in diameter and the pressing and fixing portion is pressed against the wall of the opening, thereby holding the jig in place. This is achieved by inserting the pressing and fixing portion into the opening until it enters the opening, and then moving the main body portion away from the opening with the movable member while the ring expansion portion is in contact with the end face of the ring member.

[0007] (2) In addition, the device described in (1) above is further provided with an extension portion extending toward the other main body portion at the tip end of each main body portion, a pressing and fixing portion formed at the end of the extension portion so as to extend toward the tip end, and a ring diameter expansion portion formed at the end of the pressing and fixing portion so as to be parallel to the extension portion, wherein the extension portion, the pressing and fixing portion and the ring diameter expansion portion are in a substantially U shape, and the extension portion, the pressing and fixing portion and the ring diameter expansion portion are arranged to overlap each other vertically.

[0008] (3) In addition, in the case described in (2) above, the base end of the extension is rotatably attached to the tip of the main body, and is configured to allow switching between a rotatable state and a non-rotating state.

[0009] (4) A method for inserting and fitting a mechanical joint, wherein the mechanical joint is inserted and fitted using a fitting and removal jig described in any of (1) to (3) above, With the C-shaped ring member positioned in the annular groove of the box joint, the fitting / removal jig is inserted through the opening to bring the enlarged diameter portion of the ring into contact with the ring end face of the C-shaped ring member. The process involves moving the first member and the second member apart using the movable member, thereby expanding the diameter of the C-shaped ring member and pressing the pressing fixing part against the wall of the opening to hold the jig, The steps include inserting the pin joint into the box joint, The process includes the step of removing the aforementioned fitting and removal jig.

[0010] (5) A method for removing a mechanical joint, which involves removing the mechanical joint using a fitting and removal jig described in any of (1) to (3) above, The process involves inserting the fitting / removal jig into the opening of the box fitting, which is in the inserted-fitted state, and bringing the ring-expanded portion into contact with the ring end face of the C-shaped ring member. The process involves moving the first member and the second member apart using the movable member, thereby expanding the diameter of the C-shaped ring member and pressing the pressing fixing part against the wall of the opening to hold the jig, The process of removing the pin joint from the box joint, The process includes the step of removing the aforementioned fitting and removal jig. [Effects of the Invention]

[0011] By using the fitting and removal jig and mechanical fitting according to the present invention, the fitting and removal of pin fittings and box fittings can be performed without any special processing of the C-ring member. [Brief explanation of the drawing]

[0012] [Figure 1] This is an explanatory diagram of a fitting and removal jig according to Embodiment 1. [Figure 2] Figure 1 is an explanatory diagram of the components that make up the fitting and removal jig shown. [Figure 3] Figure 1 is an explanatory diagram of the operation of the fitting and removal jig shown. [Figure 4] This is an explanatory diagram (part 1) of the expansion operation of the C-ring member using the fitting and removal jig shown in Figure 1. [Figure 5] This is an explanatory diagram (part 2) of the expansion operation of the C-ring member using the fitting and removal jig shown in Figure 1. [Figure 6] It is a photograph of the actual object when the construction experiment was conducted. [Figure 7] It is an explanatory diagram of the insertion fitting method of the mechanical joint using the joint fitting / removing jig shown in Fig. 1. [Figure 8] It is an explanatory diagram (part 1) of the diameter expansion operation of the C-ring member using the joint fitting / removing jig according to Embodiment 2. [Figure 9] It is an explanatory diagram (part 2) of the diameter expansion operation of the C-ring member using the joint fitting / removing jig according to Embodiment 2. [Figure 10] It is an explanatory diagram (part 3) of the diameter expansion operation of the C-ring member using the joint fitting / removing jig according to Embodiment 2. [Figure 11] It is an explanatory diagram (part 1) of the diameter expansion operation of the C-ring member using the joint fitting / removing jig according to another aspect of Embodiment 2. [Figure 12] It is an explanatory diagram (part 2) of the diameter expansion operation of the C-ring member using the joint fitting / removing jig according to another aspect of Embodiment 2. [Figure 13] It is an explanatory diagram (part 3) of the diameter expansion operation of the C-ring member using the joint fitting / removing jig according to another aspect of Embodiment 2. [Figure 14] It is an explanatory diagram (part 4) of the diameter expansion operation of the C-ring member using the joint fitting / removing jig according to another aspect of Embodiment 2. [Figure 15] It is an explanatory diagram of the joint fitting / removing jig according to Embodiment 3. [Figure 16] It is an exploded view of the joint fitting / removing jig shown in Fig. 15. [Figure 17] It is an explanatory diagram of the usage method of the joint fitting / removing jig shown in Fig. 15. [Figure 18] It is an explanatory diagram of another aspect of the joint fitting / removing jig according to Embodiment 3. [Figure 19] It is an explanatory diagram of the configuration and joining method of the mechanical joint to be used with the joint fitting / removing jig according to the present invention. [Figure 20] It is an explanatory diagram of the movement of the C-ring member of the mechanical joint shown in Fig. 19. [Modes for carrying out the invention]

[0013] Before describing embodiments of the present invention, an example of a mechanical joint 51 comprising a pin joint 53 and a box joint 55, which are the subject of the present invention, will be described with reference to Figures 19 and 20. Here, Figure 19(a) shows the pin joint 53 before insertion into the box joint 55, Figure 19(b) shows the completed insertion state, and Figure 19(c) shows the C-shaped ring member 57 after its diameter has been expanded. In Figures 19(a) to (c), the upper section is a vertical cross-sectional view, the middle section is a plan cross-sectional view, and the lower section shows the vicinity of the opening 59 provided in the box joint 55. Figures 20(a) to 20(c) correspond to Figures 19(a) to 20(c), respectively, and illustrate the movement of the C-shaped ring member 57.

[0014] As shown in Figures 19 and 20, the mechanical joint 51 includes a tubular pin joint 53, a box joint 55 into which the pin joint 53 is inserted, and one or more annular grooves 61 formed to face the outer circumferential surface of the pin joint 53 and the inner circumferential surface of the box joint 55, respectively. Regarding the designation for the annular groove 61, M is used when referring only to the pin joint 53 side, F is used when referring only to the box joint 55 side, and when referring to the entire annular groove 61M and annular groove 61F as a single unit, it is written as annular groove 61. Then, the pin joint 53 and the box joint 55 are joined by arranging the C-shaped ring member 57 so as to span both the box joint 55 side and the pin joint 53 side within the annular groove 61. The structure of the mechanical coupling 51 will be described in detail below.

[0015] As shown in Figure 19(a), the mechanical joint 51 consists of a tubular pin joint 53 and a box joint 55 into which the pin joint 53 is inserted and fitted, and is attached to the end of the steel pipe 63 to join the steel pipes 63 together. Furthermore, a stepped portion 65 is formed on the base end side of the pin joint 53, and as shown in Figure 19(b), when the pin joint 53 is inserted into the box joint 55, the tip portion 67 of the box joint 55 comes into contact with the stepped portion 65, completing the insertion. Note that box fitting 55 is the same as what is called an external fitting or female fitting, and pin fitting 53 is the same as what is called an internal fitting or male fitting.

[0016] Annular grooves 61M and 61F are formed on the outer circumferential surface of the pin joint 53 and the inner circumferential surface of the box joint 55, respectively, and face each other when the joints are inserted. In this example, in the pre-insertion state, the C-shaped ring member 57 is housed in the box joint 55, so the depth of the annular groove 61F of the box joint 55 is the same as or slightly deeper than the thickness of the C-shaped ring member 57. On the other hand, the depth of the annular groove 61M of the pin joint 53 is about half the thickness of the C-shaped ring member 57.

[0017] Furthermore, the C-shaped ring member 57, which is stored in the annular groove 61F of the box joint 55, is stored in such a way that it does not obstruct the insertion of the pin joint 53 into the box joint 55, and is positioned so as to straddle both the box joint 55 side and the pin joint 53 side within the annular groove 61 when inserted. The C-shaped ring member 57 has a notch 69 at one location in the circumferential direction and has a spring structure that expands and contracts elastically in the radial direction.

[0018] As shown in Figure 19, the C-shaped ring member 57 is forcibly expanded in diameter by an expansion jig 71 (see the middle section of Figure 19(a)) when housed in the annular groove 61F of the box joint 55, and the expansion jig 71 can be operated from an opening 59 provided in the box joint 55. The fitting and removal jig of the present invention replaces the diameter expansion jig 71, and its details will be described later.

[0019] The fitting operation of the conventional mechanical joint 51 configured as described above will now be explained. Before inserting the pin joint 53 into the box joint 55, as shown in Figure 19(a), the C-shaped ring member 57 is stored in the annular groove 61F of the box joint 55. Aligning the pin joint 53 and the box joint 55, the pin joint 53 is inserted into the box joint 55. As shown in Figure 20(a), the C-shaped ring member 57 is stored in the annular groove 61 on the box joint 55 side, so it does not obstruct the insertion operation.

[0020] As shown in Figure 19(b), the insertion of the pin joint 53 into the box joint 55 is completed when the stepped portion 65 of the pin joint 53 and the tip of the box joint 55 are in contact. In this state, the annular grooves 61 formed in the pin joint 53 and the box joint 55 form an annular closed space, and the C-shaped ring member 57 stored in the annular groove 61F of the box joint 55 is positioned opposite the annular groove 61M of the pin joint 53 (see Figure 20(b)).

[0021] Next, by accessing the diameter expansion jig 71 through the opening 59 and releasing the expanded state of the C-shaped ring member 57, as shown in Figures 19(c) and 20(c), the C-shaped ring member 57 is reduced in diameter by its own spring force, and the C-shaped ring member 57 is positioned to straddle both annular grooves 61, completing the fitting.

[0022] In the fully fitted state, compressive force is transmitted mainly by the contact pressure between the stepped portion 65 of the pin joint 53 and the tip portion 67 of the box joint 55, and tensile force is transmitted mainly by the bearing pressure of the C-shaped ring member 57. Torsional force is transmitted by the shear of the bolt (not shown) that connects the box joint 55 and the pin joint 53.

[0023] In the above explanation, an expansion jig 71 was used as an example to hold the C-shaped ring member 57 in an expanded state. However, with the expansion jig 71, similar to the connecting member in Patent Document 1, the installation process on the C-shaped ring member 57 is complicated, and the removal of the pin joint 53 and the box joint 55 is also very complicated. Therefore, in this embodiment, a fitting and removal jig for the mechanical fitting 51 that can be fitted and removed without performing such complicated work will be described below. In the following explanation, the term "tip" refers to the side closer to the mechanical joint when the fitting / removal jig is in use, while the opposite direction is referred to as the "base."

[0024] As shown in Figure 1, the fitting and removal jig 1 according to this embodiment comprises a first member 3 and a second member 5 that can move toward and away from each other, a guide member 7 that guides the first member 3 and the second member 5 to move toward and away from each other, and a movable member 9 that moves the first member 3 and the second member 5 toward and away from each other. Figure 1(a) is a side view, and Figure 1(b) is a top view.

[0025] <First and second members> The first member 3 and the second member 5 each comprise a main body portion 11A, 11B, a pressing and fixing portion 13A, 13B, a ring diameter expansion portion 15A, 15B, and a tip tapered portion 17A, 17B. The main body portions 11A and 11B, the pressing and fixing portions 13A and 13B, the ring diameter expansion portions 15A and 15B, and the tip tapered portions 17A and 17B are provided on both the first member 3 and the second member 5. However, since the parts provided on the first member 3 and the second member 5 have the same shape, the designations are the same, with "A" added to the part on the first member 3 and "B" added to the part on the second member 5. This also applies to the other components, which will be discussed later.

[0026] Main body The main body sections 11A and 11B are made of rectangular plate-shaped members, with movable holes 19A and 19B on the base end side in the longitudinal direction and guide holes 21A and 21B on the tip side. Near the movable holes 19A and 19B, movable members 9 are provided to move the main body portions 11A and 11B toward and toward each other, and guide members 7 are provided in the guide holes 21A and 21B.

[0027] 《Pressing and fixing part》 The pressing and fixing parts 13A and 13B are provided continuously on the tip side of the main body parts 11A and 11B, and fix the joint fitting / removal jig 1 to the box joint 55 by pressing against the wall of the opening 59.

[0028] Ring diameter expansion section The ring diameter expanding portions 15A and 15B are provided continuously on the tip side of the pressing and fixing portions 13A and 13B, and expand the diameter of the C-shaped ring member 57 by pushing open the notch portion 69 in the C-shaped ring member 57.

[0029] 《Tapered tip section》 The tapered tip sections 17A and 17B are provided on the tip side of the ring-expanded sections 15A and 15B to facilitate insertion of the C-shaped ring member 57 into the notch 69. For this reason, the tapered tip sections 17A and 17B become narrower towards the tip.

[0030] <Moving components> The movable member 9 includes a nut member 23 fixed to the first member 3 and having a screw hole communicating with the movable holes 19A and 19B, a threaded rod 25 having a male screw that screws into the nut member 23 and is inserted through the movable holes 19A and 19B of the first member 3 and the second member 5, a handle 27 provided on one end of the threaded rod 25 for rotating the threaded rod 25, and a retaining member 29 provided on the other end of the threaded rod 25 to prevent the threaded rod 25 from coming out of the movable holes 19A and 19B. As shown in Figure 1(b), a friction-reducing plate 31 is provided between the retaining member 29 and the second member 5 to reduce friction between the retaining member 29 and the second member 5 and to facilitate the rotation of the threaded rod 25.

[0031] As shown in Figure 2(a), the tip of the threaded rod 25 is tapered to form a stepped portion 35, and a small-diameter portion 33 is formed beyond that. A threaded portion is provided at the tip of the small-diameter portion 33, and a retaining member 29 is attached to the threaded portion.

[0032] <Guide Member> Guide members 7, made of round rods, are inserted into the guide holes 21A and 21B so as to penetrate the first member 3 and the second member 5, and guide the first member 3 and the second member 5 to move toward and away from each other while maintaining a parallel state. As shown in Figure 2(b), the guide member 7 has threaded portions formed at both ends of a round bar, and retaining nuts 37 are fixed to the threaded portions.

[0033] The operation of the fitting and removal jig 1 will be explained based on Figures 1 and 3. In Figure 3, the rectangle indicated by the dashed line represents the opening 59 provided in the box joint 55. Also, Figure 3 shows the view from arrow AA in Figure 1(b), with the guide member 7 omitted. When the pair of main body parts 11A and 11B are in close proximity (see Figures 1 and 3(a)), the handle 27 is turned to rotate the threaded rod 25, which is then screwed into the nut member 23. At this time, the stepped portion 35 of the threaded rod 25 pushes away the main body part 11B of the second member 5, causing the main body part 11B of the second member 5 to move away from the main body part 11A of the first member 3, guided by the guide member 7 (see Figure 3(b)). Because of this operation, the C-shaped ring member 57 can be expanded in diameter by bringing the ring expansion portions 15A and 15B into contact with the notched end face of the C-shaped ring member 57 and moving the main body portion 11B of the second member 5.

[0034] Next, the operation of expanding the diameter of the C-shaped ring member 57 positioned in the annular groove 61 of the box joint 55 using the fitting fitting / removal jig 1 will be explained with reference to Figures 4 and 5. Note that, in order to avoid complicating the drawings, Figures 4 and 5 do not include all the reference numerals shown in Figure 1. As shown in Figure 4, with the main body parts 11A and 11B in close proximity, insert the tapered tip parts 17A and 17B through the opening 59 of the box joint 55, position them in the notch 69 of the C-shaped ring member 57 (see Figure 4(b)), and then push them in further from that position. As a result, the ring-expanded portions 15A and 15B come into contact with the end face of the notch 69 of the C-shaped ring member 57. At this time, a portion of the pressing and fixing portions 13A and 13B enters the opening 59.

[0035] In this state, as described above, by turning the handle 27 and rotating the threaded rod 25, the main body portion 11B of the second member 5 is pushed by the threaded rod 25 and moves away from the first member 3 while being guided by the guide member 7. As a result, as shown in Figure 5, the ring diameter expanding portions 15A and 15B push open the end faces of the notches 69 of the C-shaped ring member 57, thereby expanding the diameter of the C-shaped ring member 57.

[0036] When the first member 3 and the second member 5 are close to their furthest distance from each other, the pressing and fixing parts 13A and 13B of both members come into contact with the wall surface of the opening 59. By further turning the handle 27, the pressing and fixing parts 13A and 13B press against the wall surface, generating a strong frictional force. This causes the fitting and removal jig 1 to be fixed to the box joint 55 with the C-shaped ring member 57 in an expanded diameter state. Figure 6 shows a photograph of the actual structure in this state as it appeared during the construction experiment. Note that the fitting and removal jig shown in Figure 6 differs in shape from that in Figure 1, but its function is the same, so the corresponding parts are denoted with the same reference numerals as in Figure 1. The main difference from Figure 1 is that in Figure 1, the guide member 7 is positioned closer to the tip than the movable member 9, whereas in Figure 6, the movable member 9 is positioned closer to the tip than the guide member 7.

[0037] In the state shown in Figures 5 and 6, the C-shaped ring member 57 is housed within the annular groove 61F of the box joint 55, so as not to obstruct the insertion of the pin joint 53 into the box joint 55. Then, as shown in Figure 7(a), with the fitting fitting / removal jig 1 held in the box fitting 55, the pin fitting 53 is inserted into the box fitting 55. Once the insertion of the pin joint 53 is complete, rotate the handle 27 in the opposite direction to move the first member 3 and the second member 5 closer together. When the pressure on the pressing and fixing parts 13A and 13B of both members is released, remove the joint fitting / removal jig 1 by pulling it out through the opening 59 (see Figure 7(b)). When the fitting / removal jig 1 is removed, the C-shaped ring member 57 elastically shrinks in diameter and returns to its natural state, positioned within the annular groove 61 so as to straddle both the pin fitting 53 side and the box fitting 55 side, completing the fitting of the box fitting 55 and the pin fitting 53.

[0038] In actual construction experiments, the diameter expansion operation took about 1 minute, and the joint fitting took about 20 seconds. Furthermore, the fitting / removal jig 1 can be forcibly pulled out without turning the handle 27. In experiments, when the fitting / removal jig 1 was pulled out using the auxiliary winding of a crane at a distance, it was confirmed that it automatically engaged even when no one was nearby.

[0039] Next, the method for removing the box fitting 55 and pin fitting 53, which are in a mated state, will be explained below. As explained in Figure 4, with the main bodies 11A and 11B of the fitting / removal jig 1 in close proximity, the tapered tip portions 17A and 17B are positioned into the notches 69 of the C-shaped ring member 57 through the opening 59 of the box fitting 55 and pushed in. In this state, as described above, the handle 27 is turned to rotate the threaded rod 25, moving the second member 5 away from the first member 3 and expanding the diameter of the C-shaped ring member 57. When the second member 5 is near its furthest point from the first member 3, the pressing and fixing parts 13A and 13B come into contact with the wall surface of the opening 59. By further turning the handle 27, the pressing and fixing parts 13A and 13B press against the wall surface, thereby fixing the joint fitting / removal jig 1 to the box joint 55 with the C-shaped ring member 57 in an expanded diameter state. At this time, the C-shaped ring member 57 is stored in the annular groove 61F of the box joint 55 and does not obstruct the removal of the pin joint 53 from the box joint 55, so the box joint 55 is removed by pulling it out from the pin joint 53.

[0040] As described above, according to this embodiment, the pin joint 53 and the box joint 55 can be fitted and removed without any special processing of the C-shaped ring member 57. The box joint 55 only needs to have an opening 59 with a width approximately equal to the required diameter expansion of the C-ring member 57 plus the thickness of the tool, and there is no concern about a reduction in the strength of the box joint 55. Furthermore, as mentioned above, experiments have confirmed that the joint can be automatically completed remotely, eliminating the need for manual intervention at the joint pile location. This eliminates the need to perform joint fitting near the ground surface, removing location constraints for joint fitting and enabling safer joint pile construction.

[0041] [Embodiment 2] The width (circumferential length) of the opening 59 formed in the box joint 55 defines the distance that the pressing and fixing parts 13A and 13B can move when the first member 3 and the second member 5 move away from each other with the joint fitting and removal jig inserted. The movement distance of the pressing and fixing parts 13A and 13B is related to the movement distance of the ring diameter expansion parts 15A and 15B, so the greater the movement distance of the pressing and fixing parts 13A and 13B, the greater the movement distance of the ring diameter expansion parts 15A and 15B can be. For example, if it is necessary to expand the notch 69 of the C-shaped ring member 57 to be expanded by 60 mm, the width of the opening 59 needs to be large enough to allow the ring diameter expansion parts 15A and 15B to move away from each other by approximately 60 mm. On the other hand, increasing the width of the opening 59 presents the problem of reduced strength of the box joint 55. Therefore, it is necessary to increase the travel distance of the ring diameter expansion sections 15A and 15B without increasing the opening width.

[0042] The fitting and removal jig 39 of this embodiment meets such requirements, and as shown in Figures 8 to 10, each main body portion 11A, 11B has extension portions 41A, 41B extending perpendicularly toward the other main body portion 11A, 11B at the tip end, pressing and fixing portions 13A, 13B formed at the ends of the extension portions 41A, 41B to extend toward the tip end, and ring diameter expansion portions 15A, 15B formed at the ends of the pressing and fixing portions 13A, 13B to be parallel to the extension portions 41A, 41B. The extension portions 41A, 41B, pressing and fixing portions 13A, 13B and ring diameter expansion portions 15A, 15B are in a substantially U-shape, and the extension portions 41A, 41B, pressing and fixing portions 13A, 13B and ring diameter expansion portions 15A, 15B are arranged to overlap vertically. In Figures 8 to 10, parts that are the same as those shown in Figure 1 and parts that have the same function are denoted by the same reference numerals as in Figure 1.

[0043] Figure 8 shows the joint fitting and removal jig 39 configured as described above, with the first member 3 and the second member 5 in the closest possible position, and the tip end of the pressing and fixing parts 13A and 13B inserted into the opening 59. Since the extensions 41A and 41B, the pressing and fixing parts 13A and 13B, and the ring diameter expansion parts 15A and 15B are arranged to overlap vertically, as shown in Figure 8, the pressing and fixing parts 13A and 13B can move by a distance equal to the width of the opening 59 minus the width of one of the pressing and fixing parts 13A and 13B. In this respect, compared to Embodiment 1, where the movement distance was only equal to the distance equal to the difference between the widths of both pressing and fixing parts 13A and 13B, the movement distance is larger. In other words, the width of the opening 59 can be reduced to ensure the necessary travel distance.

[0044] Figures 9 and 10(b) show the state in which the first member 3 and the second member 5 are separated as far apart as possible by the movable member. As can be seen by comparing this with Figure 5 of Embodiment 1, it is possible to greatly enlarge the diameter of the C-shaped ring member 57 even if the width of the opening 59 is small.

[0045] As described above, according to this embodiment, the width of the opening 59 can be reduced and the strength of the box joint 55 can be ensured. However, in this embodiment, in order to achieve the state shown in Figure 8, it is necessary to widen the notch 69 of the C-shaped ring member 57 with a screwdriver or the like so that the ring diameter expansion portions 15A and 15B can fit inside. In this respect, Embodiment 1 does not require this extra step, and can be said to be superior in terms of workability. In the above description, examples were given in which the extension portions 41A, 41B, the pressing and fixing portions 13A, 13B, and the ring diameter-expanding portions 15A, 15B are roughly U-shaped. However, the present invention is not limited to this, and the extension portions 41A, 41B, the pressing and fixing portions 13A, 13B, and the ring diameter-expanding portions 15A, 15B may be arch-shaped for better workability.

[0046] Furthermore, in order to remove the fitting / removal jig 39 from the box fitting from the state shown in Figures 9 and 10(b), the handle 27 must be rotated to bring the pair of main body parts 11A and 11B, as shown in Figures 8 and 10(a), into the closest possible position, which presents challenges in terms of workability. Therefore, in other embodiments of this implementation, the fitting and removal jig 43 is configured such that the base ends of the extensions 41A and 41B are rotatably attached to the tips of the main bodies 11A and 11B, as shown in Figures 11 and 12, and that it is possible to switch between a rotatable state and a non-rotating state. Specifically, at the base ends of the extensions 41A and 41B, a rotating shaft 45 is provided to rotatably support the extensions 41A and 41B, and adjacent to the rotating shaft 45, a rotation prevention pin 47 is provided that can be inserted and removed to prevent rotation.

[0047] To remove the fitting / removal jig 43 from the box joint 55 from the main body parts 11A and 11B in their furthest separated state (see Figure 12), the rotation prevention pin 47 is removed (see Figure 13(b)). This causes the ring expansion parts 15A and 15B to be pressed against the C-shaped ring member 57, which elastically deforms in the diameter reduction direction, and the extension parts 41A and 41B to rotate. As a result, the fitting / removal jig 43 can be removed while the first member 3 and the second member 5 remain separated, as shown in Figures 13 and 14(c). In Figure 13(b), the area where the anti-rotation pin 47 has been removed is indicated by a white circle.

[0048] Thus, according to other embodiments, it is possible to improve workability while ensuring the strength of the box joint 55.

[0049] [Embodiment 3] As described at the beginning of Embodiment 2, in the fitting and removal jig according to the present invention, it is required to increase the travel distance of the ring-expanded portions 15A and 15B without increasing the width (circumferential length) of the opening 59 formed in the box joint 55. The fitting and removal jig 48 of this embodiment also meets the above requirements, similar to Embodiment 2, and as shown in Figure 15, L-shaped ring-shaped diameter-enlarged portions 15A and 15B are provided at the tips of the pressing and fixing portions 13A and 13B. The L-shaped ring-shaped diameter-expanding portions 15A and 15B are composed of insertion pieces 49A and 49B extending from the pressing and fixing portions 13A and 13B toward the tip, and diameter-expanding rod portions 50A and 50B extending perpendicular to the insertion pieces 49A and 49B. In Figures 15 and 16, parts that are the same as those shown in Figure 1 and parts that have the same function are denoted by the same reference numerals as in Figure 1.

[0050] When the threaded rod 25 and guide member 7 are removed from the fitting / disassembly jig 48, the device is disassembled as shown in Figure 16. The fitting and removal jig 48 differs from those in embodiments 1 and 2 in that it is set in the opening 59 of the box fitting 55 in a disassembled state.

[0051] Specifically, as shown in Figure 17, the ring-expanding portion 15A of the first member 3, which is separated from the second member 5, is inserted through the opening 59, the tip surface of the expandable rod portion 50A is brought into contact with the end surface of the notch portion 69 of the C-shaped ring member 57, and the C-shaped ring member 57 is expanded by pushing in the expanding direction. Subsequently, the ring-expanding portion 15B of the second member 5 is inserted through the opening 59, similar to the case of the first member 3, and the tip surface of the expanding rod portion 50B is brought into contact with the end surface of the notch portion 69 of the C-shaped ring member 57, and the C-shaped ring member 57 is expanded by pushing in the expanding direction. This allows the tip surfaces of the expanding rod portions 50A and 50B of the first member 3 and the second member 5 to be pressed against the end surface of the notch portion 69 of the C-shaped ring member 57.

[0052] In this state, the movable hole 19A and guide hole 21A of the first member 3 are aligned with the movable hole 19B and guide hole 21B of the second member 5, and the threaded rod 25 and guide member 7 are attached to achieve the state shown in Figure 15. Thereafter, similar to [Embodiment 1], by turning the handle 27 to rotate the threaded rod 25, the main body 11B of the second member 5 is pushed by the threaded rod 25 and moves away from the first member 3 while being guided by the guide member 7. As a result, the expanding rod portions 50A and 50B push open the end faces of the notches 69 of the C-shaped ring member 57, thereby expanding the diameter of the C-shaped ring member 57, and the pressing and fixing portions 13A and 13B press against the walls of the opening 59, fixing the joint fitting / removal jig 48 to the box joint 55. When removing the fitting / removal jig 48 from the box fitting 55, the threaded rod 25 and guide member 7 can be removed to disassemble it into the first member 3 and the second member 5.

[0053] In actual construction experiments, when the opening 59 formed in the box joint 55 was φ35, it was possible to enlarge the diameter of the C-shaped ring member 57 using the joint fitting / removal jig 48 and to remove the joint fitting / removal jig 48 after enlargement.

[0054] As described above, with the fitting and removal jig 48 according to this embodiment, the C-shaped ring member 57 is expanded when the ring expansion portions 15A and 15B of the disassembled main body portions 11A and 11B are inserted into the opening 59, respectively. Therefore, the travel distance of the ring expansion portions 15A and 15B after assembly is small, and thus there is no need to increase the width (circumferential length) of the opening 59 formed in the box joint 55.

[0055] Furthermore, the insertion piece 49A and the diameter-expanding rod 50A in the L-shaped ring diameter-expanding portion 15A may be a single piece, or they may be formed by welding two separate members, or a female thread may be formed at the tip of the insertion piece 49A so that the diameter-expanding rod 50A, which may be made of a bolt or the like, can be screw-fixed in place. The same applies to the ring diameter-expanding portion 15B of the second member 5.

[0056] In Embodiment 1, the movable holes 19A, 19B and guide holes 21A, 21B formed in the main body portions 11A, 11B were all round holes. In this regard, in the fitting and removal jig 48 according to this embodiment, the movable hole 19A and guide hole 21A formed in the main body 11A need to be round holes, as shown in Figure 18(a), similar to Embodiment 1. However, in the main body 11B, instead of the movable hole 19B and guide hole 21B, a movable U-shaped notch 20B and a guide U-shaped notch 22B, which are not round holes but have one side cut out, may be used instead, as shown in Figure 18(b). This makes it easier to assemble the fitting and removal jig 48 when it is installed. [Explanation of Symbols]

[0057] 1. Fitting and removal jig for joints (Embodiment 1) 3. First Member 5. Second Member 7 Guide member 9. Movable Members 11A Main body (first component side) 11B Main body (second component side) 13A Pressing and fixing part (first member side) 13B Pressing and fixing part (second member side) 15A Ring diameter enlargement section (first member side) 15B Ring diameter expansion section (second member side) 17A Tapered tip section (first member side) 17B Tapered tip section (second member side) 19A Operating hole (on the side of the first member) 19B Movable hole (on the side of the second member) 21A Guide hole (on the first member side) 21B Guide hole (second member side) 23 Nut component 25 threaded rod 27 Handle 29 Retaining member 31 Friction reduction plate 33 Small diameter section 35 Step part 37 Retaining nut 39. Fitting and Removal Tool for Joints (Embodiment 2) 41A Extension (first member side) 41B Extension (second member side) 43 Fitting and removal jig (another embodiment of Embodiment 2) 45 Rotation axis 47 Anti-rotation pin 48. Fitting and Removal Jig (Embodiment 3) 49A Insertion piece (first member side) 49B Insertion piece (second member side) 50A Diameter-enlarged rod section (first member side) 50B Diameter-enlarged rod section (second member side) 51 Mechanical couplings 53 Pin fittings 55 Box fittings 57 C-type ring member 59 Opening 61 Ring groove 61M Annular groove (pin joint side) 61F Annular groove (box joint side) 63 Steel pipe 65 Step section 67 Tip 69 Notch 71 Diameter expansion jig

Claims

1. A fitting and removal jig for a mechanical fitting, comprising a tubular pin fitting, a box fitting into which the pin fitting is inserted and fitted, and a C-shaped ring member, used when inserting and / or removing the mechanical fitting, The outer circumferential surface of the pin joint and the inner circumferential surface of the box joint each have one or more annular grooves formed to face each other when the insertion is complete. The C-shaped ring member is configured to expand elastically so as to be able to be stored in the annular groove of the box joint without obstructing the insertion of the pin joint into the box joint, and to be positioned within the annular groove so as to straddle both the pin joint side and the box joint side when the expanded state is released after insertion is complete. An opening is formed on the outer surface of the box joint that allows access to the annular groove. The aforementioned fitting and removal jig is, It comprises a first member and a second member that can move toward and toward each other, a guide member that guides the first member and the second member toward and toward each other, and a movable member that moves the first member and the second member toward and toward each other. The first member and the second member are The device comprises a main body to which the guide member and the movable member are attached, a pressing and fixing part provided on the tip side of the main body to fix the joint fitting and removal jig to the box joint by pressing it against the wall of the opening, and a ring diameter expanding part provided on the tip side of the pressing and fixing part to expand the diameter of the ring member by pushing open the notch in the C-shaped ring member. A fitting and removal jig for joints, wherein the C-shaped ring member is expanded in diameter and the fitting and fixing portion is pressed against the wall of the opening, thereby holding the jig in place, by inserting the pressing and fixing portion into the opening through the opening, and with the ring expansion portion in contact with the end face of the ring member, the main body is moved away by the movable member.

2. The fitting and removal jig for joints according to claim 1, comprising: an extension portion extending toward the other main body portion at the tip end of each main body portion; a pressing and fixing portion formed at the end of the extension portion so as to extend toward the tip end; and a ring-expanding portion formed at the end of the pressing and fixing portion so as to be parallel to the extension portion, wherein the extension portion, the pressing and fixing portion and the ring-expanding portion are substantially U-shaped, and the extension portion, the pressing and fixing portion and the ring-expanding portion are arranged to overlap each other vertically.

3. The joint fitting and removal jig according to claim 2, wherein the base end of the extension is rotatably attached to the tip of the main body, and the jig is configured to be switchable between a rotatable state and a non-rotating state.

4. A method for inserting and fitting a mechanical joint, comprising inserting and fitting a mechanical joint using a joint fitting and removal jig described in any one of claims 1 to 3, With the C-shaped ring member positioned in the annular groove of the box joint, the joint fitting / removal jig is inserted through the opening to bring the ring-expanded portion into contact with the ring end face of the C-shaped ring member. The process involves moving the first member and the second member apart using the movable member, thereby expanding the diameter of the C-shaped ring member and pressing the pressing fixing part against the wall of the opening to hold the jig, The steps include inserting the pin joint into the box joint, A method for inserting and fitting a mechanical joint, comprising the step of removing the aforementioned fitting and removal jig.

5. A method for removing a mechanical joint, comprising removing the mechanical joint using a joint fitting and removal jig described in any one of claims 1 to 3, The process involves inserting the fitting / removal jig into the opening of the box fitting, which is in the inserted and fitted state, and bringing the ring-expanded portion into contact with the ring end face of the C-shaped ring member. The process involves moving the first member and the second member apart using the movable member, thereby expanding the diameter of the C-shaped ring member and pressing the pressing fixing part against the wall of the opening to hold the jig, The process of removing the pin joint from the box joint, A method for removing a mechanical joint, comprising the step of removing the aforementioned joint fitting and removal jig.

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