JP2023061344A - Joining method and joining member - Google Patents

Abstract

To provide a joining method and a joining member which facilitates centering of a second pipe and a first pipe and can shorten work time in an excavated trench without being affected by the level of skill of a worker.SOLUTION: A joining method for joining a first pipe and a second pipe into which inner diameter part the first pipe is inserted and which has an increased diameter part formed with a larger diameter than an outer diameter of the first pipe, the joining method comprising the steps of: fixing the first pipe to a fixing part; attaching, to the fixing part, an arm part protruding in a direction of the second pipe; making an abutment part formed at the arm part abut on the increased diameter part such that the abutment part protrudes from an end part of the increased diameter part in a direction of the second part; attaching a reaction force member to the first pipe; attaching a joining member to the fixing part; and inserting the second pipe into the inner diameter part by operating the joining member.SELECTED DRAWING: Figure 7

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining method and a joining member used for assembling pipe members, particularly for joining cast iron pipes together.

Conventionally, various construction methods are known as construction methods for burying water supply and sewage pipes, such as an open cut method and jacking method.

The open-cut method is a construction method in which the ground is directly excavated to excavate an excavated trench, a foundation is formed in the excavated trench, multiple pipes are installed as new pipes, and the multiple pipes are joined together to lay them. .

When inserting the insertion port of one of a plurality of pipes to be laid into the receptacle of the other pipe, it is necessary to perform centering and positioning work between the pipes for smooth laying of the new pipe.

In this centering and positioning work, one pipe is dropped into the excavated groove in a state of being suspended from the outside of the excavated groove by a crane such as a Unic, and the other pipe that has already been laid and the newly installed pipe are aligned. The position of the pipe was assisted by human power in cooperation with the workers in the excavation trench and the crane operator.

However, this human-assisted centering and positioning of the joint pipe requires a lot of work time in the excavated trench, and the number of people required for the work is also large. There has been a demand for a method that facilitates the positioning work. In addition, the work must be done visually by the worker, and the centering position must be maintained while the pipe is suspended. There was also the problem of not being able to

Furthermore, in the conventional joining work of new pipes, band members are attached to the receiving port of the other pipe and the insertion port of one pipe, respectively, and the band members are pulled together by a ratchet-type joining device to connect the one pipe. The practice has been to join the spigot to the receptacle of the other tube.

Various structures are known for the centering structure of the pipe member. In order to be able to attach to a steel pipe, a ring-shaped jig body formed by joining a plurality of divided arc-shaped members with a coupling means, and a jig body provided in the jig body so as to extend toward the other steel pipe and a screw adjusting rod that is screwed to the tip of each arm so that it can be moved forward and backward toward the center axis of the steel pipe, and the tip of the screw adjusting rod is the outer circumference of the other steel pipe. A structure is known in which the surfaces are pressed and the central axes of two steel pipes are aligned.

According to such a centering structure, it is not necessary to weld the erection piece to the steel pipe, so that the work efficiency in the steel pipe welding work is significantly improved, and the quality of the steel pipe weld joint can be improved. and other effects. Further, the same centering jig of the present invention can be used repeatedly, so that it is extremely advantageous in reducing costs in welding and joining steel pipes.

JP-A-2000-263292

However, since the conventional centering structure is a method of performing centering for welding the joint ends together, the outer diameters of the facing portions of the steel pipes are the same. On the other hand, joint pipes such as ductile cast iron pipes are inserted by moving the spigot of one pipe into the socket of the other pipe that has already been laid by moving the spigot in the axial direction of the pipe. There was a problem that the conventional centering structure could not be applied due to the different diameters.

In the open-cut method, as described above, a new pipe is hung by a crane or the like in the excavated trench. It has been required to easily perform the centering and positioning work of the other pipe that has already been laid and the one pipe by simply lowering the pipe into the excavated trench.

Therefore, the present invention is an invention that has been made in view of the above problems, and it is possible to easily perform centering of the second pipe and the first pipe, and to dig a trench without being affected by the skill level of workers. An object of the present invention is to provide a joining method and a joining member capable of shortening the working time inside.

In the joining method according to the present invention, a first pipe is inserted into an inner diameter portion, and an enlarged diameter portion is formed to be larger than an outer diameter of an insertion portion of the first pipe. A method for joining a second pipe to a second pipe, comprising the steps of: fixing a fixing portion to the first pipe; attaching an arm portion projecting in the direction of the second pipe to the fixing portion; a step of contacting the contact portion formed in the above with the expanded diameter portion so that the contact portion protrudes from the end of the expanded diameter portion toward the second pipe; The method is characterized by comprising the steps of: attaching a force member; attaching a joining member to the fixing portion; and operating the joining member to insert the second tube into the inner diameter portion.

Moreover, in the joining method according to the present invention, it is preferable to include a step of removing the arm portion after inserting the second pipe into the inner diameter portion.

Moreover, in the joining method according to the present invention, it is preferable to include the step of removing the joining member after inserting the second pipe into the inner diameter portion.

Moreover, in the joining method according to the present invention, it is preferable to include the step of removing the reaction force member after inserting the second pipe into the inner diameter portion.

Further, the joint member according to the present invention includes a first pipe and an enlarged diameter portion into which the first pipe is inserted and formed to be larger than the outer diameter of the insertion portion of the first pipe. A joining member used for joining with a second pipe formed with a fixing part fixed to the first pipe, an engaging claw that can be engaged, and attached to the second pipe It is characterized by comprising a connecting portion connected to the reaction member by a connecting means, and a winding portion for operating the connecting portion to wind up the connecting means.

Moreover, in the joining member according to the present invention, it is preferable that the winding section includes an operation section that can be operated by an electric power tool.

The above summary of the invention is not an exhaustive list of all the necessary features of the invention, and subcombinations of these features can also be inventions.

In the joining method according to the present invention, a first pipe is inserted into an inner diameter portion, and an enlarged diameter portion is formed to be larger than an outer diameter of an insertion portion of the first pipe. A method for joining a second pipe to a second pipe, comprising the steps of: fixing a fixing portion to the first pipe; attaching an arm portion projecting in the direction of the second pipe to the fixing portion; a step of contacting the contact portion formed in the above with the expanded diameter portion so that the contact portion protrudes from the end of the expanded diameter portion toward the second pipe; A step of attaching a force member, a step of attaching a joining member to the fixing portion, and a step of operating the joining member to insert the second pipe into the inner diameter portion, so that the centered state is maintained. It is possible to shorten the working time in the excavated trench without depending on the skill level of the workers.

Further, the joint member according to the present invention includes a first pipe and an enlarged diameter portion into which the first pipe is inserted and formed to be larger than the outer diameter of the insertion portion of the first pipe. A joining member used for joining with a second pipe formed with a fixing part fixed to the first pipe, an engaging claw that can be engaged, and attached to the second pipe Since it is provided with a connection part connected by a reaction member and a connection means, and a winding part that operates the connection part and winds up the connection means, it can be used in an excavated trench without depending on the skill level of a worker. work time can be shortened.

The perspective view which shows the outline|summary of the new pipe used for an open-cut method. FIG. 2 is a perspective view of a centering member used in the joining method according to the first embodiment of the present invention; FIG. 4 is a perspective view of a fixing portion of a centering member used in the joining method according to the first embodiment of the present invention; FIG. 4 is a perspective view of an arm portion of a centering member used in the joining method according to the first embodiment of the present invention; FIG. 2 is a side view of a centering member used in the joining method according to the first embodiment of the present invention; A reaction member used together with the centering member used in the joining method according to the first embodiment of the present invention, wherein (a) is a diagram showing an attached state, and (b) is a diagram showing a state in which the split pieces are opened. figure. 1 is a perspective view of a joint member according to a first embodiment of the present invention; FIG. (a) is a perspective view for explaining the joining member according to the first embodiment of the present invention; (b) is a perspective view showing a modification of the joining member used in the joining method according to the first embodiment of the present invention; FIG. 2 is a flow diagram of a joining method according to the first embodiment of the present invention; FIG. 8 is a perspective view of an arm portion of a centering member used in a joining method according to a second embodiment of the present invention; FIG. 8 is a perspective view of a fixing portion of a centering member used in a joining method according to a second embodiment of the present invention; FIG. 11 is a perspective view showing a modification of the fixing portion of the centering member used in the joining method according to the second embodiment of the present invention; The perspective view of the reaction member used with the centering member used for the joining method which concerns on the 2nd Embodiment of this invention. FIG. 8 is a perspective view of a reaction member used together with the centering member used in the joining method according to the second embodiment of the present invention; The perspective view of the joining member which concerns on the 2nd Embodiment of this invention.

Preferred embodiments for carrying out the present invention will be described below with reference to the drawings. In addition, the following embodiments do not limit the invention according to each claim, and not all combinations of features described in the embodiments are essential for the solution of the invention. .

[First embodiment]
FIG. 1 is a perspective view showing an outline of a new pipe used in an open-cut method, FIG. 2 is a perspective view of a centering member used in the joining method according to the first embodiment of the present invention, and FIG. 4 is a perspective view of a fixing portion of a centering member used in the joining method according to the first embodiment of the present invention, and FIG. 4 is a centering member used in the joining method according to the first embodiment of the present invention; FIG. 5 is a side view of a centering member used in the joining method according to the first embodiment of the present invention, and FIG. 6 is a perspective view of the arm portion of the first embodiment of the present invention. FIG. 7 shows a reaction member used together with a centering member used in such a joining method, in which (a) is a diagram showing an attached state, (b) is a diagram showing a state in which the split pieces are opened, and FIG. It is a perspective view of a joint member according to a first embodiment of the present invention, FIG. 8 (a) is a perspective view for explaining the joint member according to the first embodiment of the present invention, (b) the first embodiment of the present invention. FIG. 9 is a perspective view showing a modification of the joining member used in the joining method according to the embodiment of FIG. 9, and FIG. 9 is a flow chart of the joining method according to the first embodiment of the present invention.

As shown in FIG. 1, the new pipes (the second pipe 1 and the first pipe 2) laid using the joining method according to the present embodiment are hollow iron pipe members having a predetermined length, A ductile iron pipe is preferably used. The second tube 1 and the first tube 2 are formed with an insertion portion serving as an insertion port 4 on the distal end side, and a receiving port 3a is formed on the proximal end side, and the outer diameter is formed larger than that of the insertion portion. An enlarged diameter portion 3 is formed.

The second pipe 1 and the first pipe 2 are joined together by fitting the spigot 4 of the first pipe 2 into the receptacle 3a of the second pipe 1 that has already been laid. A sealing rubber ring (not shown) and a lock ring for preventing slippage are provided between the socket 3a and the insertion port 4. As shown in FIG. When the insertion port 4 is inserted into the socket 3a, the tip of the insertion port 4 and the socket 3a are in close contact with the rubber ring for sealing, and no gap is formed. To prevent the sealing rubber ring attached to the receiving port 3a of the second pipe 1 from falling off or being damaged when the first pipe 2 is inserted, the outer circumference of the insertion port 4 and the inner circumference of the sealing rubber ring are A lubricant is applied.

The second pipe 1 and the first pipe 2 are connected to the second pipe 1 and Centering should be done so that the centerlines of the first tube 2 are coincident.

As shown in FIG. 2, the centering member 10 used in the joining method according to the present embodiment is attached to the first pipe 2 to center the second pipe 1 and the first pipe 2. can be done. The centering member 10 according to this embodiment has a fixing portion 11 attached to the insertion opening 4 of the first pipe 2 and an arm portion 12 detachably attached to the fixing portion 11 .

As shown in FIG. 3 , the fixing portion 11 is a band-like member that is wound around and attached to the outer periphery of the insertion port 4 of the first pipe 2 . The fixed part 11 is attached at a position at a predetermined distance from the tip of the insertion port 4, and is attached so as not to overlap the insertion portion of the insertion port 4 into the receiving port 3a. The fixing portion 11 has a band main body 25 and a pair of flanges 26, 26 formed by protruding from both ends of the band main body 25 in the radial direction of the first pipe 2. are fixed by bolts and nuts 23 that connect them to each other. The collar portion 26 is arranged with a predetermined interval, and the shaft portion 23a of the bolt/nut 23 is arranged so as to traverse the interval, and is formed so as to be able to engage and fix the attachment/detachment portion 20 described later. ing. Further, the flange portion 26 is formed with a joint member attachment portion 24 to which a joint member 30 (to be described later) is attached so as to protrude in the longitudinal direction.

As shown in FIG. 2 , the arm portion 12 is attached to the fixed portion 11 and extends from the fixed portion 11 so as to protrude in the direction of the second pipe 1 . As shown in FIG. 4 , the arm portion 12 has a detachable portion 20 formed on the base end side, and the detachable portion 20 is attached to the fixed portion 11 . Further, the arm portion 12 includes a pair of arm portions 16, 16 extending substantially in parallel along the longitudinal direction from the attachment/detachment portion 20, and a contact portion 13 formed on the tip side of the pair of arm portions 16, 16. ing. The pair of arm portions 16 are curved to protrude upward so that the contact portion 13 and the enlarged diameter portion 3, which will be described later, reliably contact each other.

The detachable portion 20 has an engaging portion 21 that engages with the shaft portion 23a of the bolt 23 of the fixing portion 11 and a claw portion 22 that holds the shaft portion 23a engaged with the engaging portion 21 . The claw portion 22 is urged by a spring (not shown) to the shaft portion 23a so as to be freely engaged with and disengaged from the shaft portion 23a. The arm portion 12 is configured to prevent the arm portion 12 from inadvertently slipping out when the second pipe 1 is centered, and to be able to remove the arm portion 12 after the first pipe 2 is joined. there is

A pair of arm portions 16 , 16 are arranged with a predetermined gap S, and their distal ends are connected to each other by reinforcing portions 17 . Also, a reinforcing portion may be provided in the intermediate portion of the arm portion 16 as necessary. A contact portion 13 is formed at the tip of the arm portion 16 and extends from each of the pair of arm portions 16 in a direction away from each other. In this way, since the contact portions 13 are extended in directions away from each other, the contact portions 13 are in contact with the enlarged diameter portion 3 at two points, thereby separating the second pipe 1 and the first pipe 2. Centering can be performed with higher accuracy.

The contact portion 13 has a predetermined length along the longitudinal direction, and as shown in FIG. A contact portion 14 that contacts the enlarged diameter portion 3 and an insertion allowance portion 15 that protrudes from the base end of the enlarged diameter portion 3 when the tip is aligned with the enlarged diameter portion 3 and is brought into contact with the enlarged diameter portion 3 . have. A rubber ring (not shown) for sealing is set in the socket 3a, and the position where it is set is a certain distance from the end of the socket 3a toward the other end in the tube axial direction. position. At this time, the centered state must be maintained until the insertion port 4 of the first pipe 2 is inserted into the rubber ring for sealing. 2, the abutting portion 13 moves toward the distal end along the longitudinal direction of the enlarged diameter portion 3, and the insertion allowance portion 15 is securely connected to the enlarged diameter portion 3 until it is inserted into the rubber ring for sealing. , and even when the first tube 2 is inserted to a position where the contact portion 14 does not contact the enlarged diameter portion 3, the contact portion 13 is prevented from falling off from the enlarged diameter portion 3, and a reliable core You can keep the output.

Next, the joint member 30 according to this embodiment will be described with reference to FIGS. As shown in FIGS. 7 and 8A, the joint member 30 has an engaging claw 31 that engages with the joint member mounting portion 24 of the fixed portion 11, and is formed to be attachable to the fixed portion 11. ing. At this time, the joint member 30 is held in the lateral direction by being sandwiched in the gap S between the pair of arm portions 16 , 16 . In addition, the joint member 30 has a worm gear 32 and a gear 33 meshing with the worm gear 32 as a connecting portion. The worm gear 32 is arranged to be rotatable by operating an operation portion 32a, and the gear 33 has a winding portion 34 capable of winding a wire 41, which will be described later.

It is preferable that the operating portion 32a rotates the worm gear 32 by attaching an electric tool such as an impact driver. Moreover, it is not limited to an electric tool, and a handle or the like for manually applying a rotational force may be attached.

Furthermore, as shown in FIG. 8(b), a joining material 30' having a conventionally known ratchet structure may be used without attaching the joining member 30. FIG. In this case, the metal fitting 50 with the hook 53 having the hook 53 can be attached to the fixing portion 11, and the reaction member 40 and the hook 53 can be connected and fastened by the bonding material 30'.

The metal fitting 50 with a hook has an engaging pin 52 that engages with the claw portion 22 of the fixing portion 11 and an engaging groove 51 that engages with the mounting pin 11 a of the arm portion 12 . The engagement groove 51 has a groove portion and a notch portion extending in the pipe axis direction. Moreover, the metal fitting 50 with a hook is attached so as to fit on the arm portion 12 .

A reaction member 40 is attached to the second pipe 1 at a position not overlapping the enlarged diameter portion 3 . The reaction member 40 is a jig for taking a reaction force at the time of joining, and has an annular portion 42 to which a hook portion 41a of a wire 41 as connecting means is attached. The joining member 30 and the reaction member 40 are connected by a wire 41. By winding the wire 41 with the winding part 34 of the joining member 30, the first pipe 2 is turned into the second pipe 1. Join. As for the wire 41, a chain 41' may be used as shown in FIG. 8(b).

As shown in FIG. 6( a ), the reaction member 40 is constructed by fastening together a pair of split pieces 43 a and 43 b attached to the outer periphery of the second pipe 1 with a hinge 44 . As shown in FIG. 6(b), the first split piece 43a is a substantially C-shaped member having an upper piece 45a and a pair of side pieces 45b, 45b hanging down from both ends of the upper piece 45a. , and the second split piece 43b is a substantially C-shaped member that is laterally open and has a pair of upper and lower pieces 46a, 46a and a side piece 46b that connects one end of the pair of upper and lower pieces 46a, 46a. The first split piece 43a and the second split piece 43b are rotatably connected by a hinge 44 to one side piece 45b of the first split piece 43a and a side piece 46b of the second split piece 43b. ing. Also, the annular portion 42 is attached to the upper piece 46a of the second split piece 43b.

Since the reaction member 40 is configured in this way, when attaching the reaction member 40 to the second pipe 1, as shown in FIG. The opening portion of the first split piece 43a is inserted so as to be in contact with the outer circumference of the second pipe 1 . At this time, since the second split piece 43b is arranged along the longitudinal direction of the second pipe 1, it does not interfere with the second pipe 1 when the first split piece 43a is assembled.

After that, the hinge 44 is rotated to move the second split piece 43b so as to be substantially parallel to the first split piece 43a so as to be in the state shown in FIG. 6(a). At this time, since the second split piece 43b is opened in the horizontal direction, the opening of the second split piece 43b moves along the outer circumference of the second pipe 1, thereby opening the second split piece 43b. 43b and the outer circumference of the second tube 1 do not interfere. When the second split piece 43b moves to the state shown in FIG. 5(a), the opening of the first split piece 43a (lower portion of the second pipe 1) is closed by the lower piece 46a of the second split piece 43b. This makes it possible to attach the reaction member 40 to the outer circumference of the second pipe 1 .

Further, the reaction member 40 can be easily removed by opening the second split piece 43b to the state shown in FIG. 6(b). It is designed so that it can be easily removed from the

Next, a method for joining the second pipe 1 and the first pipe 2 according to this embodiment will be described with reference to FIG. First, the fixing part 11 is attached and fixed to the first pipe 2 (S101). The fixing part 11 may be attached at the site where the new pipe is laid, or may be attached at the factory when the new pipe (first pipe 2) is manufactured.

After that, the arm portion 12 is attached to the fixed portion 11 (S102). Specifically, the shaft portion 23 a of the fixing portion 11 is engaged with the engaging portion 21 of the attaching/detaching portion 20 of the arm portion 12 , and the shaft portion 23 a is fixed by the claw portion 22 . At this time, since the claw portion 22 is biased in the direction of the shaft portion 23a by a spring (not shown), the claw portion 22 is retracted against the spring force in the direction opposite to the biasing side of the shaft portion 23a. , the shaft portion 23 a can be engaged with the engaging portion 21 .

Next, on the outer periphery of the insertion port 4 of the first pipe 2 to which the arm portion 12 is attached and on the inner periphery of the sealing rubber ring (not shown) set in the receptacle 3a of the second pipe 1 that has already been laid. After applying the lubricant, the first pipe 2 is suspended by a crane or the like in the excavated trench, and the contact portion 13 of the arm portion 12 is attached to the enlarged diameter portion 3 of the second pipe 1 laid in the excavated trench. abut on. At this time, the contact portion 13 is arranged so as to have an insertion allowance portion 15 so as to protrude from the base end side of the enlarged diameter portion 3 toward the first tube 2 side. The centering of the second pipe 1 and the first pipe 2 can be performed by the contact between the enlarged diameter portion 3 and the contact portion 13 .

Next, the reaction member 40 is attached at a position that does not overlap the enlarged diameter portion 3 of the second pipe 1 (S104). The attachment of the reaction member 40 may be performed before the step of bringing the contact portion 13 into contact with the enlarged diameter portion 3 (S103).

Next, the joining member 30 is attached to the second pipe 1 and the first pipe 2 (S105). Specifically, the engaging claws 31 of the joint member 30 are engaged with the fixed portion 11 of the first pipe 2 to hold the joint member 30 between the pair of arm portions 16 . Also, the hook portion 41 a of the wire 41 is attached to the annular portion 42 of the reaction member 40 .

Next, by rotating the operation portion 32a of the joining member 30 with an electric tool or the like and winding the wire 41, the reaction member 40 is locked to the step with the enlarged diameter portion 3, and the reaction force causes the second rotation. One tube 2 is inserted into the socket 3a of the second tube 1 and fitted (S106). At this time, instead of using the joining member 30, a joining material having a conventionally known ratchet structure as shown in FIG. 8B may be used.

After the fitting of the first tube 2 is completed, the arm portion 12, the joint member 30 and the reaction member 40 are removed (S107-S109). The order of removal of the arm portion 12, the joining member 30 and the reaction member 40 is not limited to the order shown in FIG. 9, and the order does not matter. Moreover, although the fixing part 11 may be removed at the same time, it may be buried while attached to the first pipe 2 .

After that, after confirming the joint state of the second pipe 1 and the first pipe 2 with a check gauge or the like, the first pipe 2 becomes the already laid second pipe and the next first pipe By performing joining work and repeating the process until the necessary length of new pipe is obtained, the laying of the new pipe is completed.

As described above, according to the joining method and the joining member according to the present embodiment, the centering of the second pipe 1 and the first pipe 2 can be performed only by bringing the contact portion 13 into contact with the enlarged diameter portion 3. Therefore, the centering and positioning work can be easily performed, and the working time in the excavated trench can be shortened regardless of the skill level of the workers. In addition, the second pipe 1 and the first pipe 2 can be easily joined simply by operating the operation portion of the joining member 30 with an electric tool or the like.

[Second embodiment]
The case where the centering member used in the joining method according to the first embodiment described above has an arm portion and a fixed portion and is joined by a joining member using a reaction member has been described. The centering member used in the joining method according to the second embodiment described below describes an arm portion, a fixing portion, and a reaction member having different forms from those of the first embodiment. Members that are the same as or similar to those in the first embodiment described above are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 10 is a perspective view of an arm portion of a centering member used in the joining method according to the second embodiment of the present invention, and FIG. 11 is a perspective view of the arm portion used in the joining method according to the second embodiment of the present invention. FIG. 12 is a perspective view of a fixing portion of the centering member, FIG. 12 is a perspective view showing a modification of the fixing portion of the centering member used in the joining method according to the second embodiment of the present invention, and FIG. 14 is a perspective view of a reaction force member used together with a centering member used in the joining method according to the second embodiment of the present invention, and FIG. 14 is a perspective view of the reaction force member used in the joining method according to the second embodiment of the present invention; FIG. 15 is a perspective view of a reaction member used with the centering member, and FIG. 15 is a perspective view of a joining member according to a second embodiment of the present invention;

As shown in FIG. 10, the detachable portion 20 is formed on the base end side of the arm portion 62 used in the joining method according to the present embodiment. Further, the arm portion 62 includes a pair of arm portions 16, 16 extending substantially in parallel along the longitudinal direction from the attachment/detachment portion 20, and a contact portion 13 formed on the tip side of the pair of arm portions 16, 16. ing. The pair of arm portions 16 are arranged so as to protrude upward so that the contact portion 13 and the diameter-enlarging portion 3 are reliably brought into contact with each other, similarly to the centering member used in the joining method according to the first embodiment. curved.

A pair of arm portions 16 , 16 are arranged with a predetermined gap S, and their distal ends are connected to each other by reinforcing portions 17 . Also, a reinforcing portion may be provided in the intermediate portion of the arm portion 16 as necessary. Abutment flanges 63 are formed at the distal ends of the arms 16 and extend from each of the pair of arms 16 in a direction away from each other. Further, the abutment flange 63 is attached with a wing member 64 that abuts on the enlarged diameter portion 3, and the wing member 64 is attached to an adjusting screw 65 as adjusting means attached to the reinforcing portion 17 to expand. It is attached so as to be able to approach and separate from the diameter portion 3 .

The feather member 64 includes a feather member main body 64a corresponding to the abutting collar portion 63 and a connecting portion 64b with which the adjusting screw 65 is screwed. The feather member main body 64a is attached to the contact portion collar portion 63 by a bolt/nut 64c inserted through the contact portion collar portion 63 so as not to fall off. As described above, since the contact portion 13 has the feather member 64 and the adjustment means 65 that can be moved toward and away from the enlarged diameter portion 3, the sizes of the second pipe 1 and the first pipe 2 are adjusted. Different sizes of tubes can be accommodated, even if the .

A hand-holding portion 66 is formed on the distal end side of the arm portion 62 and extends from each of the pair of arm portions 16 in a direction away from each other. Also, the hand-held portion 66 connects the pair of arm portions 16 , 16 on the distal end side of the arm portion 62 . By providing such a hand-held portion 66, it is possible to safely guide and center the pipe.

As shown in FIG. 11, the fixing portion 61 is constructed by combining a pair of fixing portion split pieces 61a, 61a. The fixed portion split piece 61a includes a fixed portion split piece main body 61b curved corresponding to the outer circumference of the insertion port 4 of the first pipe 2, and first flanges formed on both ends of the fixed portion split piece main body 61b. 67 and a second collar portion 68 .

The first brim portion 67 and the second brim portion 68 are formed to protrude in the radial direction, and are formed with bolt holes 71 through which bolts and nuts for fixing the fixed portion segments 61a are inserted. A pin portion 69 is formed on the second flange portion 68 and protrudes toward the other fixed portion divided piece 61a. A pin hole 70 into which the pin portion 69 can be inserted is formed. The detailed shapes of the first flange portion 67 and the second flange portion 68 are the same as the flange portion 26 formed on the fixed portion 11 of the centering member 10 used in the joining method according to the first embodiment. , so detailed description is omitted.

In this manner, the fixing portion 61 used in the joining method according to the present embodiment is fixed in position by inserting the pin portion 69 of one of the fixing portion split pieces 61a into the pin hole 70 of the other fixing portion split piece 61a. Then, by inserting a bolt (not shown) into the bolt hole 71 and fixing it with a nut, it can be attached to the insertion port 4 of the first pipe 2 . In addition, since the fixing portion 61 used in the joining method according to the present embodiment can be divided in the radial direction of the first pipe 2, installation and removal operations can be performed in a space-saving manner.

In addition, the fixing portion 61 used in the joining method according to the present embodiment has a pair of upper and lower flanges 72 formed by combining a first flange 67 and a second flange 68 in FIG. In this way, by forming the upper and lower collar portions 72 that can be engaged and fixed by the detachable portion 20 of the arm portion 62, when joining the receptacle of a new pipe to the receptacle of a pipe that has already been laid, 15, by attaching the arm portion 62 to the lower collar portion 72, it is possible to cope with this.

The fixing part 61 used in the joining method according to the present embodiment may be of a completely separated type in which the fixing part split pieces 61a are fixed with bolts and nuts as described above. A pair of fixed portion split pieces 61c are rotatably assembled with a ball joint 73, and a hinge portion 74 attached to one fixed portion split piece 61c is engaged with a hinge locking portion 75 attached to the other fixed portion split piece 61c. It is also possible to use a fixed portion 61' that is fixed to each other. At this time, by fixing the hinge portion 74 and the hinge locking portion 75 with a fixing bolt 76 attached to the hinge portion 74, the fixation of the hinge portion 74 and the hinge locking portion 75 is prevented from being released. .

Further, the fixing portion 61' used in the joining method according to this modified example has a pair of upper and lower flange portions 72 formed in the same manner as the fixing portion 61 described above. 61c, and preferably, the collar portion 72, the hinge portion 74, the collar portion 72, and the hinge locking portion 75 are arranged at substantially equal intervals in the circumferential direction.

As shown in FIGS. 13 and 14, the reaction member 80 includes a first reaction member piece 81 formed in a substantially U shape and a second reaction member piece 82 formed in a substantially U shape. is attached via a hinge 83 so as to be openable and closable.

As shown in FIG. 13, the first reaction member piece 81 is arranged so as to open downward. It has a first lateral leg portion 81b and a second lateral leg portion 81c extending downwardly from both ends. An elongated guide hole 88a and an extending direction of the first side leg portion 81b and the second side leg portion 81c are substantially perpendicular to each other in the substantially central portion of the first reaction member piece main body 81a. A first gripping portion 87 extending in the direction is formed.

As shown in FIG. 14, the second reaction force member piece 82 is arranged so as to open sideways. It has an upper leg portion 82b and a lower leg portion 82c extending orthogonally from both ends thereof. The lower leg portion 82c is formed with a second gripping portion 89 facing the first gripping portion 87 described above.

A support base 86 extending in a direction substantially orthogonal to the extending direction of the upper leg portion 82b and the lower leg portion 82c is formed at the approximate center portion of the upper leg portion 82b. A hook receiving member 84 that pivots via a pivot 84a is attached to the support base 86, and the hook receiving member 84 is biased by an elastic body 85 in the circumferential direction of the pivot 84a.

As shown in FIG. 13, the hook receiving member 84 is urged around the pivot 84a by the elastic body 85, contacts the upper end of the first reaction member piece main body 81a, and pushes the second reaction member piece 82 upward. is biased toward The second reaction member piece 82 includes a guide pin 88 formed on the upper leg portion 82b of the second reaction member piece 82 and an elongated guide hole formed on the first reaction member piece main body 81a. It is guided vertically by the hole 88a.

The first side leg portion 81b of the first reaction member piece 81 and the second reaction member piece main body 82a of the second reaction member piece 82 are attached via a hinge 83 so as to be openable and closable. However, the hinge 83 has enough play to allow the second reaction member piece 82 to move vertically by the hook receiving member 84 .

In this manner, the second reaction member piece 82 of the reaction member 80 is urged downward and upward by the hook receiving member 84, so that the first gripping portion 87 and the second gripping portion 89 are held together. It is possible to prevent displacement of the reaction member 80 by sandwiching the outer periphery of the first tube 2 in close proximity.

Next, a joining method of the centering member 10' used in the joining method according to the present embodiment will be described with reference to FIG. As shown in FIG. 15, a fixing portion 61 is attached to the insertion opening 4 of the second pipe 1, which is an embedded pipe. Also, the arm portion 62 is attached to the lower portion 72 . At this time, the contact portion 13 of the arm portion 62 is mounted upside down from the centering member 10 used in the joining method according to the first embodiment so that the contact portion 13 faces upward. Further, the positions of the second pipe 1 and the first pipe 2 are finely adjusted by adjusting the position of the feather member 64 as necessary. Furthermore, the joining member 30 is attached to the flange portion 72 above the fixed portion 61 . The method of attaching the arm portion 62 and the joining member 30 is the same as that of the centering member 10 used in the joining method according to the first embodiment described above, so detailed description thereof will be omitted.

The reaction member 80 is attached at a position not overlapping the enlarged diameter portion 3 of the first pipe 2 , and engages the hook portion 41 a formed at the tip of the chain 41 ′ extending from the joint member 30 to the hook receiving member 84 . . After that, the joining member 30 is operated to wind the chain 41', and the socket 3a of the first pipe 2 is inserted into the insertion port 4 of the second pipe 1 to connect the first pipe 2 and the second pipe 1. Join. Moreover, since the hook receiving member 84 pivots around the pivot 84a by winding the chain 41', the reaction member 80 is more firmly fixed to the outer circumference of the first pipe 2. As shown in FIG.

As described above, according to the centering member 10' used in the joining method according to the present embodiment, the attachment and detachment of the fixing portion 61 is facilitated. Cost can be suppressed.

In the above-described first embodiment, the joint member 30 is configured by the gear 33 and the worm gear 32. However, a plurality of the gears 33 may be provided, and the worm gear 32 may be deleted and directly It may be configured to operate the gear 33 .

Further, the centering member according to the first embodiment has been described in the case of joining the insertion port 4 of the first pipe 2 to the socket 3a of the second pipe 1 that has already been laid. As with the centering member used in the joining method according to the embodiment, the receptacle of the new pipe may be joined to the insertion port of the pipe that has already been laid. In this case, the arms 12 are attached to the pipes that have already been laid so that the abutting portions 13 face upward, and the enlarged diameter portions of the pipes that are suspended by a crane or the like are brought into contact with each other. Centering can be performed. Also, as a modified example of the fixing portion used in the joining method according to the second embodiment, the fixing portion 61' in which the pair of fixing portion divided pieces 61c are rotatably assembled by the ball joint 73 has been described. The fixed part segment 61c may be rotatably assembled using a universal joint. It is clear from the description of the scope of claims that forms with such modifications or improvements can also be included in the technical scope of the present invention.

REFERENCE SIGNS LIST 1 second pipe 2 first pipe 3 expanded diameter portion 3a socket (inner diameter portion)
4 insertion port (insertion part)
Reference Signs List 10, 10' Centering member 11, 61 Fixing part 12, 62 Arm part 13 Contact part 14 Contact part 15 Insertion allowance part 16 Arm part 17 Reinforcement part 20 Detachable part 21 Engagement part 22 Claw part 23 Bolt 23a Shaft part 24 Joining member attaching portion 25 Band main body 26, 72 Collar portion 30 Joining member 31 Engaging claw 32 Worm gear 32a Operating portion 33 Gear 34 Winding portion 40, 80 Reaction member 41 Wire 41' Chain 41a Hook portion 42 Annular portion 43a First split piece 43b Second split piece 44 Hinge 50 Metal fitting with hook 51 Engagement groove 52 Engagement pin 53 Hook 61a Fixed part split piece 61b Fixed part split piece main body 63 Contact part flange 64 Wing member 64a Wing member main body 64b connecting portion 64c bolt/nut 65 adjusting screw (adjusting means)
66 hand-held portion 67 first flange portion 68 second flange portion 69 pin portion 70 pin hole 71 bolt hole 73 ball joint 74 hinge portion 75 hinge locking portion 81 first reaction member piece 82 second reaction member piece 83 hinge 84 hook receiving member 84a pivot 85 elastic body 86 support base 87 first gripping portion 88 guide pin 89 second gripping portion S space

Claims (6)

A first tube and a second tube having an enlarged diameter portion larger than the outer diameter of the insertion portion of the first tube, the first tube being inserted into the inner diameter portion. A joining method comprising:
a step of securing the securing portion to the first tube;
A step of attaching an arm portion projecting in the direction of the second pipe to the fixing portion;
a step of bringing the contact portion formed on the arm portion into contact with the enlarged diameter portion so that the contact portion protrudes from the end portion of the enlarged diameter portion toward the second pipe;
attaching a reaction member to the first tube;
a step of attaching a joining member to the fixing portion;
manipulating the joining member to insert a second tube into the inner diameter;
A joining method comprising: In the joining method according to claim 1,
A joining method comprising a step of removing the arm portion after inserting the second pipe into the inner diameter portion. In the joining method according to claim 1 or 2,
A joining method comprising a step of removing the joining member after inserting the second pipe into the inner diameter portion. In the joining method according to any one of claims 1 to 3,
A joining method, comprising a step of removing the reaction force member after inserting the second pipe into the inner diameter portion. A first tube and a second tube having an enlarged diameter portion larger than the outer diameter of the insertion portion of the first tube, the first tube being inserted into the inner diameter portion. A joining member used for joining,
a fixing portion fixed to the first pipe; an engaging pawl that can be engaged;
a connecting portion connected by a connecting means to the reaction force member attached to the second pipe;
and a winding section that operates the connecting section to wind the connecting means. The joining member according to claim 5,
The joining member, wherein the winding section includes an operation section that can be operated by an electric tool.

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