Joint structure

Abstract

To provide a joint structure which can joint, in a joint work of a new pipe, a second pipe and a first pipe with a small force, and easily detach a joint structure attached to the second pipe and the first pipe without using a tool.SOLUTION: A joint structure is used for jointing a first pipe, and a second pipe having an inner diameter part in which the first pipe is inserted and having an expanded diameter part formed larger than an outer diameter of an insertion part of the first pipe. The structure includes: a fix part fixed to the first pipe; a joint member which is attachable to and detachable from the fix part; and a reaction force member attached to the second pipe. The joint member and the reaction force member are jointed by first jointing means. The joint member includes: a joint member body which is attachable to and detachable from the fix part; and a winding part for winding up the first jointing means. One end of the first jointing means is wound by the winding part, and the other end is fixed to the joint part body via a first pulley attached to the reaction force member.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a joint structure used when assembling pipe members, in particular when joining cast iron pipes together. [Background technology]

[0002] Conventionally, various methods have been known for burying water supply and sewerage pipes, and the like, including the cut-and-cover method and the jacking method.

[0003] The open cut method involves directly excavating the ground to create a trench, forming foundations within the trench, installing multiple pipes that will become new pipes, and then joining the multiple pipes together to lay them down.

[0004] Various methods are known for joining such newly installed pipes. For example, as described in Patent Document 1, a joining member is used to join a first pipe to a second pipe, the inner diameter of which is inserted into a second pipe and which has an enlarged diameter portion formed larger than the outer diameter of the inserted portion of the first pipe, the joining member comprising a fixing portion fixed to the first pipe, an engageable engaging claw, a connecting portion connected to a reaction member attached to the second pipe by a connecting means, and a winding portion which operates the connecting portion to wind up the connecting means.

[0005] According to this type of joint structure, the joint means is wound up by operating the joint portion, so that the joint of the newly installed pipe can be easily performed. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2023-061344 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the conventional joining structure, a single connecting means attached to the reaction member is wound up by the winding portion of the joining member, which has the problem of requiring a relatively large force. Even when the joining work is performed using a tool, the need for the large force described above can lead to problems such as failure or damage to the tool.

[0008] In addition, as described above, the open cut method involves directly excavating the ground to excavate an excavation trench, forming foundations etc. within the excavation trench to install multiple pipes that will become new pipes, and then joining the multiple pipes to each other and laying them.As such, the joining work for the new pipes is carried out within the excavation trench, so there was a demand for improving workability by allowing the attachment and detachment of reaction members and joining members to be carried out within the excavation trench.

[0009] Specifically, when the reaction member or the joining member is attached using tools, if these tools are left inside the excavation trench, it becomes difficult to secure a working space inside the excavation trench, so after the attachment work, the tools are placed outside the excavation trench and the joining work is performed. In this case, if these tools are needed again when the joining work is completed and the reaction member or the joining member is removed, it becomes necessary to go and retrieve the tools placed outside the excavation trench, which makes the work very difficult.

[0010] Therefore, the present invention has been made in consideration of the above-mentioned problems, and aims to provide a joining structure that allows the second pipe and the first pipe to be joined with little force when joining a newly installed pipe, and that allows the joining structure attached to the second pipe or the first pipe to be easily removed without tools. [Means for solving the problem]

[0011] The joining structure of the present invention is a joining structure used to join a first pipe to a second pipe, into whose inner diameter portion the first pipe is inserted and which has an expanded diameter portion formed larger than the outer diameter of the inserted portion of the first pipe, and is characterized in that it comprises a fixing portion fixed to the first pipe, a joining member that is attachable to and detachable from the fixing portion, and a reaction member attached to the second pipe, and the joining member and the reaction member are connected by a first connecting means, and the joining member comprises a joining member main body that is attachable to and detachable from the fixing portion, and a winding portion that winds up the first connecting means, and one end of the first connecting means is attached to the winding portion, and the other end is fixed to the joining member main body via a first pulley attached to the reaction member.

[0012] Furthermore, in the joint structure according to the present invention, it is preferable that the reaction member comprises a second connecting means assembled so as to be capable of sliding, both ends of the second connecting means being respectively attached to the fixed portions, and the first pulley is attached to a tensioning portion attached to approximately the longitudinal center of the second connecting means.

[0013] In the joint structure according to the present invention, it is preferable that the second connecting means is attached via a second pulley attached to the reaction member.

[0014] Furthermore, in the joining structure of the present invention, it is preferable that the reaction member has a reaction member main body covering at least the upper half of the second pipe along the circumferential direction, and reaction member side lower mounting portions attached to both circumferential ends of the reaction member main body and covering at least the lower half of the second pipe along the circumferential direction.

[0015] Furthermore, in the joining structure of the present invention, it is preferable that the fixing portion has a fixing portion main body that covers at least the upper half of the first pipe in a circumferential direction, and fixing portion side lower mounting portions that are attached to both circumferential ends of the fixing portion main body and cover at least the lower half of the first pipe in a circumferential direction.

[0016] Furthermore, in the joining structure according to the present invention, the fixed part main body and the fixed part side lower mounting part are assembled to each other at one end via a hinge part so as to be freely swingable, and are attached at the other end by an attachment / detachment means, and the attachment / detachment means comprises an engaging part formed on the other end side of the fixed part main body, an engaged part formed on the other end side of the fixed part side lower mounting part and biased in the radial direction, and a holding means for abutting the engaging part against the engaging part from a direction intersecting the biasing direction of the engaged part, and it is preferable that the engaged part comprises an engaged part main body, an abutment part formed at the tip of the engaged part main body, and an operating lever for rotating the engaged part main body around the axial direction.

[0017] In the joint structure according to the present invention, it is preferable that both ends of the abutment surface of the abutment portion that abuts against the holding means are chamfered in the axial cross section.

[0018] The above summary of the invention does not list all of the necessary features of the present invention, and any subcombination of these features may also constitute an invention. Effect of the Invention

[0019] The joining structure according to the present invention comprises a fixing part fixed to a first pipe, a joining member detachable from the fixing part, and a reaction member attached to the second pipe, the joining member and the reaction member being connected by a first connecting means, the joining member comprising a joining member body detachable from the fixing part, and a take-up part for taking up the first connecting means, one end of the first connecting means being attached to the take-up part and the other end being fixed to the joining member body via a first pulley attached to the reaction member, so that the force required to operate the take-up part is reduced, thereby improving work efficiency. It is possible to improve work efficiency and prevent breakdowns and damage to tools used in the work.

[0020] In addition, the joining structure according to the present invention has a reaction member-side lower mounting portion and a fixed portion-side lower mounting portion that cover the underside of the reaction member and the fixed portion, making it easy to attach and detach the reaction member and the fixed portion. Furthermore, the fixed portion has an engaging portion formed on the fixed portion main body and an engaged portion formed on the fixed portion-side lower mounting portion, and the engaged portion is held by the holding means and includes an engaged portion main body, an abutment portion formed on the tip of the engaged portion main body, and an operating lever that rotates the engaged portion main body around the axial direction, so that the engagement between the engaged portion and the holding means can be released by operating the operating lever, making it possible to easily remove the fixed portion without using tools. [Brief description of the drawings]

[0021] [Figure 1] FIG. 1 is a perspective view showing an overview of a newly constructed pipe to be used in an open cut construction method. [Diagram 2] 1 is a perspective view of a joint structure according to a first embodiment of the present invention; [Diagram 3] 1 is a perspective view of a joint structure according to a first embodiment of the present invention; [Figure 4] 1 is a perspective view of a fixing portion of a joint structure according to a first embodiment of the present invention. [Diagram 5] FIG. 2 is a front view of a fixing portion of the joint structure according to the first embodiment of the present invention. [Figure 6] 3 is a partial cross-sectional view of a detachment means for a fixed portion of the joint structure according to the first embodiment of the present invention. FIG. [Figure 7] FIG. 2 is an exploded view of a detachment means of the joint structure according to the first embodiment of the present invention. [Figure 8] 1 is a perspective view of a joint member of a joint structure according to a first embodiment of the present invention; [Figure 9] 1 is a perspective view showing an internal structure of a joint member of a joint structure according to a first embodiment of the present invention. [Figure 10] FIG. 2 is a perspective view of a reaction member of the joint structure according to the first embodiment of the present invention. [Figure 11] 1 is a plan view of a joint structure according to a first embodiment of the present invention. [Figure 12] FIG. 4 is a perspective view of a joint structure according to a second embodiment of the present invention. [Figure 13]FIG. 4 is a perspective view of a joint structure according to a second embodiment of the present invention. [Figure 14] FIG. 6 is a perspective view showing a fixing portion of a joint structure according to a second embodiment of the present invention. [Figure 15] 6A and 6B are diagrams showing the structure of a slide member of a joint structure according to a second embodiment of the present invention. [Figure 16] FIG. 6 is a perspective view showing a bottom surface of a joint structure according to a second embodiment of the present invention. [Figure 17] FIG. 6 is a perspective view showing a reaction member of a joint structure according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] 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 all of the combinations of features described in the embodiments are not necessarily essential to the solution of the invention.

[0023] [First embodiment] FIG. 1 is an oblique view showing an overview of a newly constructed pipe used in an open cut method, FIG. 2 is an oblique view of a joint structure according to a first embodiment of the present invention, FIG. 3 is an oblique view of a joint structure according to a first embodiment of the present invention, FIG. 4 is an oblique view of a fixing part of the joint structure according to the first embodiment of the present invention, FIG. 5 is a front view of the fixing part of the joint structure according to the first embodiment of the present invention, FIG. 6 is a partial cross-sectional view of a detachable means of a fixing part of the joint structure according to the first embodiment of the present invention, FIG. 7 is an exploded view of a detachable means of the joint structure according to the first embodiment of the present invention, FIG. 8 is an oblique view of a joint member of the joint structure according to the first embodiment of the present invention, FIG. 9 is an oblique view showing the internal structure of the joint member of the joint structure according to the first embodiment of the present invention, FIG. 10 is an oblique view of a reaction member of the joint structure according to the first embodiment of the present invention, and FIG. 11 is a plan view of the joint structure according to the first embodiment of the present invention.

[0024] As shown in Fig. 1, the new pipes (second pipe 1 and first pipe 2) to be laid using the joint structure according to this embodiment are hollow iron pipe members having a predetermined length, and ductile iron pipes are preferably used. The second pipe 1 and the first pipe 2 have an insertion section formed at the tip side to become an insertion port 4, a receiving port 3a formed at the base end side, and an expanded diameter section 3 formed with an outer diameter larger than that of the insertion section.

[0025] The second pipe 1 and the first pipe 2 are joined together by fitting the insertion port 4 of the first pipe 2 into the socket 3a of the second pipe 1 that has already been laid. A sealing rubber ring and a lock ring to prevent it from slipping out (not shown) are provided between the socket 3a and the insertion port 4. When the insertion port 4 is inserted into the socket 3a, the sealing rubber ring tightly contacts the tip of the insertion port 4 and the socket 3a, and no gap is formed. When the first pipe 2 is inserted into the socket 3a of the second pipe 1, A lubricant is applied to the outer periphery of the insertion port 4 and the inner periphery of the sealing rubber ring so that the attached sealing rubber ring does not fall off or become damaged.

[0026] When joining the insertion port 4 of the first pipe 2 to the receiving port 3a of the second pipe 1 that has already been laid in the excavation trench, the second pipe 1 and the first pipe 2 must be centered so that the center lines of the second pipe 1 and the first pipe 2 coincide.

[0027] As shown in Figures 2 and 3, the joint structure 5 according to this embodiment is attached to the first pipe 2 and the second pipe 1, thereby centering the second pipe 1 and the first pipe 2 and joining these pipes. The joint structure 5 according to this embodiment has a fixing part 10 attached to the insertion port 4 of the first pipe 2, a centering member 11 and a joining member 30 detachably attached to the fixing part 10, and a reaction member 50 attached at a position not overlapping with the enlarged diameter part 3 of the second pipe 1. The joining member 30 is attached to the reaction member 50 via a first connecting means 61 described later. The fixing part 10 and the reaction member 50 are connected by a second connecting means 62.

[0028] The centering member 11 is attached to the fixed part 10 and extends so as to protrude from the fixed part 10 in the direction of the second pipe 1. The centering member 11 has a pair of arms 12 extending along the longitudinal direction, and is attached to the fixed part 10 via a detachable part formed on the base end side of the arms 12. The centering member 11 also has an abutment part 13 formed on the tip side of the arms 12. The arms 12 are curved so as to be convex upward so that the abutment part 13, which will be described later, and the enlarged diameter part 3 can be abutted reliably. Furthermore, a grip part 14 is formed on the abutment part 13, and the centering member 11 can be easily operated by manipulating the grip part 14.

[0029] The fixing part 10 is a band-like member that is wound around and attached to the outer periphery of the insertion port 4 of the first tube 2. The fixing part 10 is attached at a position a predetermined distance from the tip of the insertion port 4 so as not to overlap with the portion of the insertion port 4 that is inserted into the socket 3a.

[0030] As shown in Fig. 4, the fixed part 10 has a fixed part main body 21 and a fixed part side lower mounting part 22 attached to both circumferential ends of the fixed part main body 21. The fixed part main body 21 and the fixed part side lower mounting part 22 are formed so that a pair of joint member mounting parts 25 to which joint members 30 described later are attached protrude in the radial direction. As shown in Figs. 2 and 3, the fixed part main body 21 is disposed so as to cover at least the upper half of the first pipe 2 along the circumferential direction, and the fixed part side lower mounting part 22 is disposed so as to cover at least the lower half of the first pipe 2 along the circumferential direction.

[0031] A connecting means mounting portion 24 protruding in the radial direction is formed on one end side of the fixed part main body 21 and the other end side of the fixed part side lower mounting portion 22. The connecting means mounting portions 24 are preferably disposed symmetrically along the approximate radial direction of the fixed part 10, and are preferably disposed in the central portions of the fixed part main body 21 and the fixed part side lower mounting portion 22 in the circumferential direction.

[0032] The fixed part main body 21 and the fixed part side lower attachment part 22 are attached to each other at one end so as to be freely swingable around the axial direction via the hinge part 23. By allowing the fixed part 10 to swing freely by the hinge part 23, the fixed part 10 can be easily attached and detached, and can be easily removed from the pipe in a narrow space.

[0033] Further, the other end side of the fixed part main body 21 and the fixed part side lower attachment part 22 is provided with an attachment / detachment means 40, and the attachment / detachment means 40 can fix and release the other end side of the fixed part main body 21 and the fixed part side lower attachment part 22. As shown in FIG. 5, the attachment / detachment means 40 is provided by an engagement part 26 formed on the other end of the fixed part main body 21 so as to protrude in the radial direction. By holding the above by the holding means 42, the ends of the fixed portion main body 21 and the fixed portion side lower attachment portion 22 are detachably fixed.

[0034] 5 to 7, the attachment / detachment means 40 includes an attachment / detachment means base 43 formed on the other end side of the lower attachment portion 22 on the fixed portion side, an attachment / detachment means body 40a attached to a back plate member 40a' standing upright from the attachment / detachment means base 43, a holding means 42 attached movably along the standing direction of the attachment / detachment means body 40a, a biasing means 47 for biasing the cover body 40b and the operating lever 44 in a direction intersecting the standing direction of the attachment / detachment means body 40a (the radial direction of the fixed portion 10), and an engaged portion 41 assembled rotatably around the axial direction together with the cover body 40b by the operating lever 44. The engaged portion 41 includes a rod-shaped engaged portion body 46 and an abutment portion 45 formed at the tip of the engaged portion 46, and an operating lever 44 for rotating the engaged portion body 46 around the axis of the engaged portion body 46.

[0035] The engagement portion 26 formed on the fixing portion main body 21 is inserted between the abutment portion 45 and the detachment means base portion 43 inside the attachment / detachment means main body 40a, and is fixed to the attachment / detachment means 40 by moving the holding means 42 downward. Note that any structure may be used for the method of moving the holding means 42, but it is preferable to form the holding means 42 with a bolt and screw it into the attachment / detachment means main body 40a, for example.

[0036] As shown in Fig. 7, the cap claw 40c and the lever claw 44a that fit into recesses formed in the back plate member 40a' are formed to protrude from the surfaces of the cover 40b and the operating lever 44 that face the back plate member 40a'. The cover 40b and the operating lever 44 are biased in the axial direction of the engaged portion 46 by the biasing means 47, so that the engagement between the recesses of the back plate member 40a' and the cap claw 40c and the lever claw 44a is maintained, and the operating lever 44 and the engaged portion main body 46 are fixed around the axis. This makes it possible to suppress the rotation of the engaged portion main body 46 even when the holding means 42 is abutted from above the abutment portion 45.

[0037] In addition, since the engaged part main body 46 is rotatably attached by the operating lever 44, by operating the operating lever 44 in a state in which the engaging part 26 is held by the abutment part 45 and the attachment / detachment means base part 43 by the holding means 42, the abutment part 45 can be rotated to release the holding of the engaging part 26. In this case, it is preferable that the abutment surface 45a of the abutment part 45 with the holding means 42 is chamfered at both ends, so that the abutment part 45 can be smoothly rotated when the engaged part main body 46 is rotated by operating the operating lever 44. Note that the lever claw 44a formed on the operating lever 44 is fitted into a recess of the back plate member 40a', but by forming the tip of the lever claw 44a into an arc shape, it becomes possible to release the engagement between the back plate member 40a' and the lever claw 44a by operating the operating lever 44. At this time, the operating lever 44 moves the cover 40 b and the engaged portion main body 46 in the axial direction of the engaged portion main body 46 against the biasing force of the biasing means 47 .

[0038] In this way, by operating the operating lever 44, the attachment / detachment means 40 can be easily released, so that when the joining work of the newly installed pipe is completed and the fixing part 10 is to be removed, it can be easily removed without using tools.

[0039] 8 and 9, the joint member 30 includes a joint member body 31 having an operating part 34, and a winding part 32 that is rotated by the operating part 34 inside the joint member body 31. One end of a first connecting means 61 is attached to the winding part 32, and the other end of the first connecting means 61 is fixed to the joint member body 31. The first connecting means 61 is a chain-like member attached via a first pulley 63 attached to the reaction member 50. Furthermore, the first pulley 63 includes an engaging claw 64 that can engage with a pulling part 65 formed on the reaction member 50, which will be described later.

[0040] The joining member 30 has a worm gear 35 and a gear 33 that meshes with the worm gear 35. The worm gear 35 is arranged so as to be rotatable by operating an operating unit 34, and the gear 33 meshes with the worm gear 35 to connect the first connecting means 61 to a winding unit 32 that can wind up the first connecting means 61.

[0041] The operation unit 34 is preferably provided with an electric tool such as an impact driver to rotate the worm gear 35. In addition, the operation unit 34 is not limited to an electric tool, and may be provided with a handle or the like for manually applying a rotational force.

[0042] As shown in Fig. 10, the reaction member 50 has a reaction member body 51 consisting of a pair of reaction member body pieces 51a, 51b and a reaction member connecting portion 53 connecting the pair of reaction member body pieces 51a, 51b, and a reaction member side lower mounting portion 52 attached to both circumferential ends of the reaction member body 51. As shown in Figs. 2 and 3, it is preferable that the reaction member body 51 is arranged so as to cover at least the upper half of the second pipe 1 along the circumferential direction, and the reaction member side lower mounting portion 52 is arranged so as to cover at least the lower half of the second pipe 1 along the circumferential direction.

[0043] The reaction member side lower mounting part 52 is a chain-like member, and is fixed by hooking a claw part 52a formed at one end onto a lower end engagement part 51c formed at the lower end of one of the reaction member main body pieces 51b, and the other end is attached to a fastening part 54 attached to the lower end of the other reaction member main body piece 51a. The fastening part 54 is configured to be able to freely wind up the reaction member side lower mounting part 52, and when attaching the reaction member 50 to the second pipe 1, the reaction member 50 is fixed to the outer periphery of the second pipe 1 by winding up the reaction member side lower mounting part 52.

[0044] The reaction member body 51 has second pulleys 66 attached to each of the reaction member body pieces 51a, 51b, and second connecting means 62 engaged with the second pulleys 66. As shown in Figures 2 and 3, both ends of the second connecting means 62 are attached to the connecting means mounting parts 24 of the fixed part 10, and the engaging claws 64 of the first connecting means 61 engage with the pulling parts 65 formed in the approximate center of the second connecting means 62.

[0045] Next, the installation and removal operation of the joint structure 5 according to this embodiment and the method of joining a newly installed pipe using the joint structure 5 will be described.

[0046] 11, the fixing part 10 is attached to the outer periphery of the first pipe 2. At this time, the engagement part 26 formed on the fixing part main body 21 is inserted into the attachment / detachment means 40, and the holding means 42 of the attachment / detachment means 40 is moved downward, thereby fixing the fixing part main body 21 and the fixing part side lower attachment part 22 together.

[0047] Next, the reaction member 50 is attached at a position where it does not overlap with the enlarged diameter portion 3 of the second pipe 1. At this time, the reaction member side lower mounting portion 52 is engaged with the reaction member main body piece 51b, and the reaction member side lower mounting portion 52 is stretched along the outer periphery of the second pipe 1 by the fastening portion 54.

[0048] Furthermore, the joint member 30 is attached to the fixed part 10 , and the second connecting means 62 is hung around the second pulley 66 of the reaction member 50 , with both ends of the second connecting means 62 fixed to the connecting means mounting parts 24 of the fixed part 10 .

[0049] Also, an engagement claw 64 formed on a first pulley 63 attached to the first connecting means 61 of the joining member 30 is engaged with a pulling portion 65 formed on the second connecting means 62 .

[0050] Thereafter, one end of the first connecting means 61 is pulled into the joining member 30 by operating the operating portion 34 of the joining member 30 with a tool or the like. At this time, since the other end of the first connecting means 61 is attached to the joining member body 31 via the first pulley 63, The pulling force can be half that of a conventional one-point pulling joint. Also, the first connecting means 61 pulls the second connecting means 62 via the pulling part 65, and both ends of the second connecting means 62 are attached to the fixing part 10, so that the first connecting means 61 and the second connecting means 62 can perform the joining work with 1 / 4 the force of a conventional one-point pulling joint.

[0051] In addition, since the second connecting means 62 is pulled by the pulling part 65 and is looped around the second pulley 66, the pulling force of the pulling part 65 acts in a direction that draws the reaction member main body pieces 51a, 51b toward each other via the second pulley 66. This increases the fixing force of the reaction member 50, making it possible to attach the reaction member 50 to the second pipe 1 more firmly.

[0052] When the joining work of the new pipe is completed, the reaction member 50 and the fixing part 10 are removed from the second pipe 1 and the first pipe 2. The fixing part 10 is removed by operating the operating lever 44 of the attachment / detachment means 40 to rotate the abutment part 45 and release the engagement between the abutment part 45 and the engagement part 26, thereby removing the fixing part 10.

[0053] In addition, the reaction member 50 can be removed by removing the fixed portion 10 and the joining member 30 attached to the fixed portion 10, which eliminates the tension of the first connecting means 61 acting on the pulling portion 65, thereby releasing the force acting on the reaction member main body pieces 51a, 51b by the second connecting means 62 to attract each other.The tension acting on the reaction member side lower mounting portion 52 also decreases, making it possible to easily remove the claw portion 52a formed at one end of the reaction member side lower mounting portion 52 from the lower end engagement portion 51c formed at the lower end of one of the reaction member main body pieces 51b.

[0054] The joining structure of this embodiment configured as described above comprises a fixed part 10 fixed to the first pipe 2, a joining member 30 detachable from the fixed part 10, and a reaction member 50 attached to the second pipe 1, and the joining member 30 and the reaction member 50 are connected by a first connecting means 61, and the joining member 30 comprises a joining member main body 31 detachable from the fixed part 10, and a winding part 32 that winds up the first connecting means 61, and one end of the first connecting means 61 is attached to the winding part 32 and the other end is fixed to the joining member main body 31 via a first pulley 63 attached to the reaction member 50, so that the force required to operate the winding part 32 is reduced, thereby improving work efficiency and suppressing breakdowns and damage to tools used for work.

[0055] In addition, the joint structure 5 according to this embodiment has the reaction member side lower mounting part 52 and the fixed part side lower mounting part 22 that cover the lower sides of the reaction member 50 and the fixed part 10, so that the reaction member 50 and the fixed part 10 can be easily attached and detached. Furthermore, the fixed part 10 has the engagement part 26 formed on the fixed part main body 21 and the engaged part 41 formed on the fixed part side lower mounting part 22, and the engaged part 41 is held by the holding means 42 and includes the engaged part main body 46, the abutment part 45 formed on the tip of the engaged part main body 46, and the operation lever 44 that rotates the engaged part main body 46 around the axial direction. Therefore, the engagement between the engaged part 41 and the holding means 42 can be released by operating the operation lever 44, so that the operation of removing the fixed part 10 can be easily performed without using tools.

[0056] [Second embodiment] In the joining structure according to the first embodiment described above, the fixing part is a band-like member that is wound around the outer periphery of the insertion port 4 of the first pipe 2 and attached. The joining structure according to the second embodiment described next will be described with reference to an example of a fixing part and a reaction member having a different form from that of the first embodiment. Note that the same reference numerals are used to designate parts that are the same as or similar to those in the first embodiment, and descriptions thereof will be omitted.

[0057] Figure 12 is an oblique view of a joint structure relating to the second embodiment of the present invention, Figure 13 is an oblique view of a joint structure relating to the second embodiment of the present invention, Figure 14 is an oblique view showing a fixing portion of the joint structure relating to the second embodiment of the present invention, Figure 15 is a diagram showing the structure of a slide member of the joint structure relating to the second embodiment of the present invention, Figure 16 is an oblique view showing the bottom surface of the joint structure relating to the second embodiment of the present invention, and Figure 17 is an oblique view showing a reaction member of the joint structure relating to the second embodiment of the present invention.

[0058] 12 and 13, the joint structure 5' according to this embodiment, like the joint structure 5 according to the first embodiment, can be attached to the first pipe 2 and the second pipe 1 to center the second pipe 1 and the first pipe 2 and to join these pipes, and has a fixing part 70 attached to the insertion port 4 of the first pipe 2, a centering member 11 and a joining member 30 detachably attached to the fixing part 70, and a reaction member 80 attached at a position not overlapping with the enlarged diameter part 3 of the second pipe 1. The joining member 30 is attached to the reaction member 80 via a first connecting means 61. The fixing part 70 and the reaction member 80 are connected by a second connecting means 62.

[0059] As shown in Figure 14, the fixing portion 70 includes an arm mounting portion 25' to which the joining member main body 31 and centering member 11 of the joining member 30 are attached, a chain member 71 extending circumferentially around the first tube 2, and a chain member 73, and the chain member 73 is connected to the chain member 71 via a lower plate 72 attached to the end of the chain member 71.

[0060] A radially protruding connecting means attachment portion 24 is formed on each of the chain member 71 and the chain member 73. The connecting means attachment portion 24 is preferably formed at the same position as a slide member 91 and a ratchet member 92, which will be described later.

[0061] The chain member 71 is preferably configured as a so-called roller chain having a plurality of cylindrical rollers 71a arranged along the extension direction and holding plates 71b that are arranged at both axial ends of the rollers 71a and hold adjacent rollers so that they can rotate freely.

[0062] At the position where the connecting means attachment portion 24 of the chain member 71 is formed, a slide member 91 is provided as a length adjustment mechanism 90 capable of adjusting the circumferential length of the chain member 71. As shown in Fig. 15, the slide member 91 is disposed so as to be interposed between one link of the chain member 71, and includes a slide portion main body 95 attached to the holding plate 71b, and a fastening member 94 screwed into the slide portion main body 95 from the circumferential side. The slide portion main body 95 is also disposed between a pair of stoppers 96, 96 disposed along the circumferential direction.

[0063] In the slide member 91 configured in this manner, the slide portion main body 95 can be moved in the circumferential direction by rotating the fastening member 94, and therefore the length of the chain member 71 can be adjusted by moving the holding plate 71b in the circumferential direction in accordance with the movement of the slide portion main body 95. In addition, since the slide portion main body 95 is disposed between the stoppers 96, 96, it is possible to prevent the fastening member 94 from falling off or being over-tightened due to excessive rotation of the fastening member 94.

[0064] The chain member 73 is configured in a linear shape by connecting a plurality of annular members to each other, and a chain-like member similar to the first connecting means 61 and the second connecting means 62 is preferably used. A hook that engages with the lower plate 72 is attached to one end of the chain member 73. Furthermore, a ratchet member 92 is attached to the other end of the chain member 73 as a length adjustment mechanism, and the chain member 73 is wound up by the ratchet member 92, making it possible to adjust the circumferential length.

[0065] The ratchet member 92 may have various known structures as long as it can wind up the chain member 73. For example, it is preferable that a rotating gear that can be made to rotate in reverse or not rotate in reverse by an operating lever 93 is disposed inside the ratchet member 92, and the rotating gear is made to be non-rotatable in reverse when the chain member 73 is engaged with the rotating gear, thereby fixing the chain member 73. The length of the chain member 73 can be adjusted by operating the operating lever 93 to a state in which the rotating gear can rotate in reverse and pulling either end of the chain member 73, and the length of the chain member 73 that protrudes from the ratchet member 92 can be adjusted in only one direction by operating the operating lever 93 to a state in which the rotating gear cannot rotate in reverse.

[0066] It is preferable that the ratchet member 92 is attached to a ratchet mounting portion 97 attached to one end of the chain member 71, and it is preferable that the ratchet mounting portion 97 is formed with the above-mentioned connecting means mounting portion 24.

[0067] The lower plate 72 is a member that connects the chain member 71 and the chain member 73, and as shown in Fig. 16, includes a chain member attachment portion 75 with which any roller 71a of the chain member 71 can be engaged, and a chain member attachment portion 74 to which one end of the chain member 73 is attached. It is also preferable that the lower plate 72 includes an arm attachment portion 25a to which the centering member 11 can be attached. Note that since the chain member attachment portion 75 is configured to be able to engage with any roller 71a of the chain member 71, the length of the chain member 71 can be adjusted to fit the outer periphery of the first tube 2 before attachment, and the chain member 71 can be attached to first tubes 2 having various outer diameters.

[0068] As shown in FIG. 17, the reaction member 80 includes a reaction member main body 81 arranged to cover at least the upper half of the second pipe 1 along the circumferential direction, and a reaction member side lower mounting portion 83 arranged to cover at least the lower half of the second pipe 1 along the circumferential direction.

[0069] The reaction member body 81 includes a pair of reaction member body pieces 81a, 81b, and a reaction member connecting portion 82 that connects the pair of reaction member body pieces 81a, 81b in the circumferential direction. The pair of reaction member body pieces 81a, 81b are attached to the reaction member connecting portion 82 so as to be swingable, and are arranged so as to be bent along the outer periphery of the second pipe 1. By swinging the reaction member body pieces 81a, 81b, it is possible to appropriately attach the reaction member 80 even when attaching it to second pipes 1 having various outer diameters.

[0070] A slide member 91 and a ratchet member 92 serving as a length adjustment mechanism are attached to the end of each of the reaction member main body pieces 81a, 81b on the side to which the reaction member connecting part 82 is not attached. The slide member 91 and the ratchet member 92 are members having the same configuration as the slide member 91 and the ratchet member 92 attached to the fixing part 70 described above.

[0071] The reaction member side lower mounting portion 83 is attached at one end so as to be freely wound by a ratchet member 92 attached to one reaction member main body piece 81a, and the other end engages with a slide member 91 attached to the other reaction member main body piece 81b.

[0072] In this way, the reaction member 80 of the joint structure 5' in this embodiment is equipped with a slide member 91 and a ratchet member 92 as a length adjustment mechanism 90, so that even when attaching the reaction member 80 to second pipes 1 having various outer diameters, the reaction member 80 can be appropriately attached by adjusting the length of the reaction member side lower attachment portion 83.

[0073] Further, the second connecting means 62 is wound around the reaction member main body pieces 81a, 81b, and the second connecting means 62 is attached to the first pulley 63' via a tension portion 65. The first pulley 63' is wound around the first connecting means 61 inserted into the first connecting means insertion hole 84.

[0074] In the above-described joining structures 5, 5' according to the first and second embodiments, the joining member 30 is described as being composed of a gear 33 and a worm gear 35. However, a plurality of gears 33 may be provided, or the worm gear 35 may be eliminated and the gear 33 may be directly operated.

[0075] In addition, the joining structures 5, 5' according to the first and second embodiments have been described with reference to a case in which the operating portion 34 of the joining member 30 is operated using a tool such as an impact driver, but the operation is not limited to such a tool and may be configured to be performed using a lever hoist similar to that of a conventional device.

[0076] Furthermore, in the joining structure 5 of the first embodiment, the reaction member 50 has a reaction member main body 51 consisting of a pair of reaction member main body pieces 51a, 51b and a reaction member connecting portion 53 connecting the pair of reaction member main body pieces 51a, 51b. Although the reaction member connecting portion 53 is illustrated as a chain-like member, it is also possible to connect the pair of reaction member main body pieces 51a, 51b by a link-like member, for example.

[0077] In addition, in the joint structure 5 according to the first embodiment, the second pulley 66 is attached to each end of the reaction member body pieces 51a, 51b, but a total of four second pulleys may be formed at two locations, one at the opposing end side and the other end side of each of the reaction member body pieces 51a, 51b. By configuring in this way, it becomes possible to pull the second connecting means 62 along the axial direction relative to the newly installed pipe.

[0078] Furthermore, in the joining structures 5, 5' of the first and second embodiments, the first pulley 63 has been described as having an engaging claw 64 that can engage with the pulling portion 65 formed on the reaction member 50, but the engaging claw 64 may also be configured using, for example, a pin.

[0079] In addition, the joint structure 5' according to the second embodiment has been described with the slide member 91 and the ratchet member 92 attached to the fixed portion 70 and the reaction member 80, respectively, but it may be configured with only one of the slide member 91 and the ratchet member 92 attached. It is clear from the claims that such modified or improved forms are also included in the technical scope of the present invention. [Explanation of symbols]

[0080] 1 Second Tube 2. First Tube 3 Expanded diameter part 3a Socket (inner diameter) 4 Insertion port (insertion part) 5,5´ joint structure 10 Fixed part 11 Centering member 12 Arm section 13 Arm contact part 14 Gripping part 21 Fixed part body 22 Lower mounting part on fixed part side 23 Hinge part 24 Connection means attachment part 25,25a Arm attachment part 26 Engagement part 30 Joining materials 31 Joint member body 32 Winding section 33 Gears 34 Control section 35 Worm Gear 40 Attachment / detachment means 41 Engaged part 42 Holding means 43 Attachment / detachment means base 44 Operating lever 45 Contact part 46 Engaged part body 47 Actuation means 50,80 Reaction member 51,81 Reaction member body 51a, 51b, 81a, 81b Reaction member body piece 52, 83 Lower mounting part on reaction member side 53, 82 Reaction member connection part 54 Fastening part 61 First connecting means 62 Second connecting means 63,63´ 1st Pulley 64 Engagement claw 65 Tensile section 66 Second Pulley 70 Fixed part 71 Chain parts 71a Lola 71b Retaining plate 72 Lower plate 73 Chain member 74 Chain member attachment part 75 Chain component attachment part 84 First connecting means insertion hole 90 Length adjustment mechanism 91 Slide member 92 Ratchet member 93 Operating lever 94 Fastening members 95 Slide body 96 Stopper 97 Ratchet mounting part

Claims

1. A joining structure used for joining a first tube to a second tube, the second tube having an enlarged diameter portion formed larger than an outer diameter of an insertion portion of the first tube, the first tube being inserted into an inner diameter portion of the second tube, A fixing part fixed to the first pipe, and a joining member detachable from the fixing part; a reaction member attached to the second tube; The joining member and the reaction member are connected by a first connecting means, the joining member includes a joining member body that is detachable from the fixing portion, and a winding portion that winds up the first connecting means, A joining structure, characterized in that one end of the first connecting means is attached to the winding portion, and the other end is fixed to the joining member body via a first pulley attached to the reaction member.

2. The joining structure according to claim 1, the reaction member includes a second coupling means slidably mounted thereon; Both ends of the second connecting means are attached to the fixed portion, A joint structure, characterized in that the first pulley is attached to a tension part that is attached to approximately the center of the longitudinal direction of the second connecting means.

3. The joining structure according to claim 2, A joint structure, characterized in that the second connecting means is attached via a second pulley attached to the reaction member.

4. The joining structure according to claim 1, A joining structure characterized in that the reaction member has a reaction member main body covering at least the upper half of the second pipe along the circumferential direction, and a reaction member side lower mounting portion attached to both circumferential ends of the reaction member main body and covering at least the lower half of the second pipe along the circumferential direction.

5. The joining structure according to claim 4, At least one of a ratchet member and a slide member for adjusting a length in the circumferential direction of the reaction member is provided at at least one of the ends in the circumferential direction of the reaction member, A joint structure, characterized in that the reaction member side lower mounting portion is attached to the ratchet member and / or the slide member.

6. The joining structure according to claim 1, A joining structure characterized in that the fixing portion has a fixing portion main body that covers at least the upper half of the first pipe along the circumferential direction, and a fixing portion side lower mounting portion attached to both circumferential ends of the fixing portion main body and covering at least the lower half of the first pipe along the circumferential direction.

7. The joining structure according to claim 6, the fixed portion main body and the fixed portion side lower attachment portion are assembled to each other at one end via a hinge portion so as to be able to swing freely, and are attached to each other at the other end by an attachment / detachment means, the attachment / detachment means includes an engagement portion formed on the other end side of the fixed portion main body, an engaged portion formed on the other end side of the fixed portion side lower attachment portion and biased in a radial direction, and a holding means for bringing the engaging portion into contact with the engaging portion in a direction intersecting the biasing direction of the engaged portion, A joining structure characterized in that the engaged portion comprises an engaged portion main body, an abutment portion formed at the tip of the engaged portion main body, and an operating lever that rotates the engaged portion main body around the axial direction.

8. The joining structure according to claim 7, A joining structure, characterized in that the abutment portion has a contact surface that abuts against the holding means, the contact surface being chamfered at both ends in the axial cross section.

9. The joining structure according to claim 1, the fixing portion includes an arm attachment portion to which the joining member body is attached, a chain member arranged along a circumferential direction of the first pipe, and a chain member connected to an end of the chain member and arranged along the circumferential direction of the first pipe, A joint structure, characterized in that at least one of the chain member and the chain member is provided with a length adjustment mechanism that adjusts the circumferential length.

10. The joining structure according to claim 9, A joining structure characterized in that the length adjustment mechanism includes a slide member capable of moving a chain piece of the chain member in a circumferential direction, and a ratchet member capable of winding up the chain member.

11. The joining structure according to claim 10, A joint structure characterized in that the slide member comprises a slide portion main body attached to one end of the chain member, and a fastening member screwed into the slide portion main body.

Images