JP7356890B2 - Pipe centering jig and centering method - Google Patents

Description

The present invention relates to a centering jig and centering method used when joining pipes together.

Conventionally, as shown in FIG. 31, for example, as shown in FIG. A support rod portion 206 that extends horizontally from the top and is inserted into the insertion port 205 of the second tube 204 before joining, a cylinder device 207 that can lift the main body portion 203, and a cylinder device 207 that lifts the main body portion 203. A first support part 208 that is pressed against the upper part of the inner peripheral surface of the first tube 201 when lifted, and a first support part 208 that is provided on the support rod part 206 and can support the top inner periphery of the second tube 204. Some have two supporting parts 209.

Note that the cylinder device 207 has a lower pressing portion 211 that is pressed against the lower part of the inner circumferential surface of the end portion of the first tube 201 . Further, the first support portion 208 has an upper pressing portion 212 that is pressed against the upper portion of the inner circumferential surface of the end portion of the first tube 201 .

According to this, by lifting the main body part 203 with the cylinder device 207, the first support part 208 comes into contact with the upper part of the inner peripheral surface of the first pipe 201, and the second support part 209 contacts the upper part of the inner peripheral surface of the first pipe 201. It abuts against the upper part of the inner circumferential surface of 204.

At this time, the lower pressing part 211 is pressed against the lower part of the inner peripheral surface of the end of the first tube 201, and the upper pressing part 212 is pressed against the upper part of the inner peripheral surface of the end of the first pipe 201, so that the main body part 203 is fixed within the end of the first tube 201.

When the main body part 203 is further lifted from this state, the support rod part 206 tilts upward with the first support part 208 as a fulcrum, and the insertion port of the second tube 204 supported by the second support part 209 205 is lifted against the socket 202 of the first tube 201. Thereby, the axis of the second tube 204 can be aligned with the axis of the first tube 201.

Note that the centering jig 210 as described above is described in, for example, Patent Document 1 listed below.

JP2002-115777

However, in the conventional type described above, the position of the lower pressing part 211 and the position of the upper pressing part 212 are shifted and separated in the tube axis direction 213, so the centering jig 210 becomes larger in the tube axis direction 213. There is a problem with storing it away.

An object of the present invention is to provide a tube centering jig and centering method that can be downsized in the tube axis direction.

In order to achieve the above object, the first invention is a tube centering jig used when joining a second tube to a first tube, comprising:
a fixing frame that can be detachably fixed to the inner peripheral surface of the end of either the first tube or the second tube;
a pressing member capable of pressing the inner circumferential surface of the end of the other tube upwardly or downwardly and freely rolling or sliding in the direction of the tube axis;
It has a lifting device that lifts and lowers the pressing member with respect to the fixed frame,
The fixed frame consists of a vertical frame that stands up in the vertical direction, a horizontal frame attached to one end of the vertical frame, an upper pressing part that is pressed against the upper part of the inner peripheral surface of the end of one tube, and one and a lower pressing part pressed against the lower part of the inner circumferential surface of the end of the pipe,
The upper pressing part and the lower pressing part are located in the radial direction of one pipe and on a straight line passing through the vertical frame ,
The pressing member is located on the opposite side of the vertical frame from the side where the horizontal frame extends in the horizontal direction from the end of the vertical frame,
The horizontal frame is pressed against the upper or lower inner circumferential surface of the end of one tube.

According to this, by pressing the upper pressing part against the upper part of the inner peripheral surface of the end of one pipe and pressing the lower pressing part against the lower part of the inner peripheral surface of the end of one pipe, the fixed frame is moved inside the end of one pipe. can be fixed to.

Thereafter, by pressing the inner circumferential surface of the end of the other tube upward or downward with the pressing member, the second tube moves in the vertical direction with respect to the first tube. The axis can be aligned with the axis of the first tube.

The end of the second tube is then joined to the end of the first tube. At this time, since the pressing member rolls or slides on the inner peripheral surface of the end of the other tube in the tube axis direction, the end of the second tube is smoothly joined to the end of the first tube.

In addition, since the upper pressing part and the lower pressing part are located on a straight line in the radial direction of one of the tubes, the fixed frame can be made smaller in the tube axis direction, and this allows the centering jig to be moved in the tube axis direction. It is miniaturized in

In the pipe centering jig according to the second invention, one pipe is the second pipe, the other pipe is the first pipe,
a fixed frame is removably securable within the end of the second tube;
The pressing member is capable of pressing downwardly the lower inner circumferential surface of the end of the first tube.

According to this, the fixed frame of the centering jig is fixed within the end of the second pipe, the pressing member is brought into contact with the lower inner circumferential surface of the end of the first pipe, and the pressing member is used to Pushing the lower inner circumferential surface of the tube end downward creates an upward reaction force on the fixed frame, which forces the second tube end up against the first tube end. Thereby, the axis of the second tube can be aligned with the axis of the first tube.

In the pipe centering jig according to the third invention, one pipe is a first pipe, the other pipe is a second pipe,
a fixed frame is removably securable within the end of the first tube;
The pressing member is capable of pressing upwardly the upper inner circumferential surface of the end of the second tube.

According to this, the fixed frame of the centering jig is fixed within the end of the first pipe, the pressing member is brought into contact with the upper inner circumferential surface of the end of the second pipe, and the pressing member is used to press the second pipe. Lift the end of the second tube by pushing upward on the upper inner peripheral surface of the end of the tube. Thereby, the axis of the second tube can be aligned with the axis of the first tube.

In the tube centering jig according to the fourth aspect of the present invention, the upper pressing part or the lower pressing part is vertically movable.

According to this, even if the diameter of the pipe is different, by moving the upper pressing part or the lower pressing part in the vertical direction, the height from the lower pressing part to the upper pressing part can be changed according to the diameter of the pipe. . Thereby, the fixing frame can be fixed within the end of one tube even for a plurality of types of tubes having different diameters.

In the tube centering jig according to the fifth aspect of the present invention, the lifting device has a nut body provided on a fixed frame, and a lifting bolt that is threadedly engaged with the nut body and passes through the nut body vertically,
The pressing member is provided at the end of the lifting bolt.

According to this, the pressing member is raised and lowered by turning the raising and lowering bolt.

The pipe centering jig in the sixth aspect of the present invention is provided with a direction limiting member that limits the direction of the pressing member so that the pressing member rolls or slides in the tube axis direction even when the lifting bolt rotates. It is something that

According to this, the orientation of the pressing member is limited to rolling or sliding in the tube axis direction by the orientation limiting member, so when the lifting bolt is rotated, the orientation of the pressing member does not change, and the pressing member The member rolls or slides on the inner peripheral surface of the end of the other tube in the tube axis direction, so that the end of the second tube is smoothly joined to the end of the first tube.

In the pipe centering jig according to the seventh aspect of the present invention, the fixed frame is formed into a triangular frame shape when viewed from the side .

The eighth invention is a method for centering a pipe using the centering jig according to the third invention,
attaching the fixed frame within the end of the first tube with the axis of the second tube being shifted downward from the axis of the first tube;
bringing the end of the second tube close to the end of the first tube and inserting the pressing member into the end of the second tube;
The lifting device is operated to raise the pressing member, and the pressing member pushes the upper inner circumferential surface of the end of the second pipe upward from below, thereby moving the end of the second pipe to the end of the first pipe. This is to move the axis of the second tube upward.
The ninth invention is a method for centering a pipe using the centering jig according to the second invention,
attaching the fixed frame within the end of the second tube with the axis of the second tube being offset below the axis of the first tube;
bringing the end of the second tube close to the end of the first tube and inserting the pressing member into the end of the first tube;
The lifting device is operated to lower the pressing member, and the pressing member pushes the lower inner circumferential surface of the end of the first tube downward from above, thereby utilizing the upward reaction force generated on the fixed frame to lower the second tube. The end of the second tube is pushed up against the end of the first tube, thereby moving the axis of the second tube upward.

As described above, according to the present invention, since the upper pressing part and the lower pressing part are located on a straight line in the radial direction of one pipe, the fixed frame is downsized in the axial direction of the pipe, and thereby the centering The jig is made smaller in the tube axis direction.

FIG. 2 is a diagram of a pipeline laid underground in the first embodiment of the present invention. FIG. 3 is a sectional view of a joint portion between newly installed pipes of the conduit. FIG. 3 is a diagram showing a cut portion of a lock ring provided at a joint portion between newly installed pipes of the conduit, enlarged with an enlarger. FIG. 2 is a partially cutaway sectional view of the conduit. It is a front view of the 1st and 2nd pipe transfer device attached to the newly installed pipe of a conduit. It is a side view of the centering jig used when laying a new pipe. 7 is a view taken along the line XX in FIG. 6. FIG. It is a front view of the centering jig used when laying a new pipe. It is a front view of the internal reaction plate used when laying a new pipe. This is a diagram showing an internal reaction plate used when laying new pipes set in the inner circumferential gap of the joint between the newly installed pipes. It is a figure explaining the method of laying a new pipe in the same same as an existing pipe. It is a figure explaining the method of laying a new pipe in the same same as an existing pipe. 13 is a plan view of newly installed pipes 6 to 8 in FIG. 12. FIG. It is a figure explaining the method of laying a new pipe in an existing pipe line, and shows the procedure when performing centering work using a centering jig. It is a figure explaining the method of laying a new pipe in an existing pipe line, and shows the procedure when performing centering work using a centering jig. It is a figure explaining the method of laying a new pipe in an existing pipe line, and shows the procedure when performing centering work using a centering jig. It is a figure explaining the method of laying a new pipe in an existing pipe line, and shows the procedure when performing centering work using a centering jig. It is a figure explaining the method of laying a new pipe in an existing pipe line, and shows the procedure when performing centering work using a centering jig. It is a figure explaining the method of laying a new pipe in the same same as an existing pipe. It is a figure explaining the method of laying a new pipe in the same same as an existing pipe. It is a figure explaining the method of laying a new pipe in the same same as an existing pipe. It is a figure explaining the method of laying a new pipe in the same same as an existing pipe. It is a figure explaining the method of laying a new pipe in the same same as an existing pipe. It is a figure explaining the method of laying a new pipe in the same same as an existing pipe. It is a figure explaining the procedure when performing centering work using the centering jig in the 2nd embodiment of the present invention. It is a figure explaining the procedure when performing centering work using the same jig for centering. It is a figure explaining the procedure when performing centering work using the same jig for centering. It is a side view of the centering jig in the 3rd embodiment of this invention. It is a side view of the centering jig in the 4th embodiment of this invention. It is a figure explaining the method of laying a new pipe in an existing pipe line, and shows the procedure when performing centering work using a centering jig. FIG. 2 is a side view of a conventional centering jig.

Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
In the first embodiment, as shown in FIG. 1, reference numeral 1 denotes a new pipe line laid within an existing pipe line 2 buried underground. The newly installed pipe line 1 is made by joining a plurality of newly installed pipes 5 to 11. Each of these newly installed pipes 5 to 11 is a ductile iron pipe, and has an inlet 15 at one end and a socket 16 at the other end. Among these, the newly installed pipes 5, 8, and 11 are straight pipes, and the newly installed pipes 6, 7, 9, and 10 are each bent pipes bent at an angle of 11.25°. By inserting the insertion port 15 into the socket 16, the newly installed pipes 5 to 11 are joined together.

In addition, a plurality of pedestals 12 made of H-shaped steel are installed in the existing pipe line 2, and the sockets 16 of each of the new pipes 5 to 11 are jacked up and installed while being supported by the pedestals 12. .

As shown in FIG. 2, the inner periphery of the socket 16 is provided with a seal ring 17, a press ring 18, a plurality of bolts 19, a lock ring 20, and an annular spring 21. The seal ring 17 seals between the inner periphery of the socket 16 and the outer periphery of the socket 15, and is made of an elastic material such as rubber. The push ring 18 pushes the seal ring 17 and keeps it in a compressed state. The bolts 19 are screwed into the press ring 18 at multiple locations in the pipe circumferential direction E, and by adjusting the protruding length of the bolt 19 from the press ring 18, the pressing force from the press ring 18 to the seal ring 17 can be adjusted. I can do it.

A recess 23 is formed on the outer peripheral surface of the socket 15 over the entire circumference. The lock ring 20 is a ring having a split structure with one portion cut off, and is pressed inward in the tube diameter direction by a spring 21, so that it hugs the outer peripheral surface within the recess 23 of the insertion port 15.

As shown in FIG. 3, the lock ring 20 is expanded in diameter by enlarging the width 28 of the cut portion 22 with an expander 29, and reduced in diameter by removing the expander 29 from the cut portion 22. It has the elasticity to return to its diameter.

As shown in FIG. 2, an inner gap 25 is formed over the entire circumference between the tip of the socket 15 and the rear end surface 24 of the socket 16. Note that because one end surface 26 of the recess 23 comes into contact with the lock ring 20, the amount of movement of the insertion port 15 in the removal direction A from the socket 16 is limited, and the other end surface 27 of the recess 23 comes into contact with the lock ring 20. As a result, the amount of movement of the socket 15 in the insertion direction B relative to the socket 16 is limited.

As shown in FIG. 1, the existing pipeline 2 includes a vertically inclined gradient pipeline section 31, a lower horizontal pipeline section 32 communicating with the lower part of the gradient pipeline section 31, and an upper part of the gradient pipeline section 31. It has an upper horizontal conduit section 33 that communicates with it.

The new pipeline 1 is laid inside the existing pipeline 2 by the pipe-in-pipe construction method, and at this time, the first and second pipe transfer devices 37, 38, the centering jig 45, the internal reaction plate 46, A joining cable body 47, a joining traction device 48, etc. are used.

As shown in FIGS. 4 and 5, the first pipe transfer device 37 includes a pair of left and right sleds 50 that can freely slide on the inner surface of the existing pipe line 2, and an annular attachment that is attached to the outer periphery of each of the new pipes 5 to 11. It has a band 51 and a connecting frame 52 provided between the left and right sleds 50. Both the left and right sleds 50 are provided on the mounting band 51. Further, the second pipe transfer device 38 has the same structure as the first pipe transfer device 37.

As shown in FIGS. 1 and 4, the first pipe transfer device 37 is attached to the end of each newly installed pipe 5 to 11 on the insertion port 15 side, and the second pipe transfer device 38 is attached to the receiving end of each newly installed pipe 5 to 11. Each of the new pipes 5 to 11 can be transferred within the existing pipe line 2 by attaching it to the end on the port 16 side and sliding the sled 50 against the inner surface of the existing pipe line 2.

Note that the end on the insertion port 15 side and the end on the socket 16 side are defined as the inner circumferential gap 25 shown in FIG. This corresponds to a position where a predetermined size is reached in the axial direction.

As shown in FIGS. 6 to 8 and 14, the centering jig 45 is used, for example, when joining a new pipe 8 before joining to a new pipe 7 that has already been installed and joined. .

In the first embodiment, the newly installed pipe 7 that has been joined corresponds to the first pipe and the other pipe, and the newly installed pipe 8 before joining corresponds to the second pipe and the other pipe.

The centering jig 45 includes a fixing frame 61 that can be removably fixed to the inner peripheral surface of the socket 15 of the new pipe 8 before joining, and a lower inner peripheral surface of the socket 16 of the new pipe 7 that has already been joined. It has a pressing member 62 that can be pressed downward and freely rollable in the tube axis direction, and a lifting device 63 that raises and lowers the pressing member 62 with respect to the fixed frame 61.

The fixed frame 61 includes a frame body 65 and a fixing member 66 (an example of an upper pressing portion) provided at the upper end of the frame body 65 and movable in the vertical direction. The frame body 65 has a triangular frame shape when viewed from the side, and includes a vertical frame 68 that stands up in the vertical direction, and a horizontal frame that has one end attached to a lower end 68a (an example of a lower pressing part) of the vertical frame 68. 69, and an inclined frame 70 attached between the upper end of the vertical frame 68 and the other end of the horizontal frame 69.

The fixing member 66 can be pressed against the upper part of the inner peripheral surface of the insertion port 15 of the newly installed pipe 8, and the lower end 68a of the vertical frame 68 and the horizontal frame 69 are connected to the upper part of the inner peripheral surface of the insertion port 15 of the newly installed pipe 8. It can be pressed against the bottom. Further, the fixing member 66 and the lower end portion 68a of the vertical frame 68 are located on a straight line 71 (see FIGS. 6, 8, and 14) in the radial direction of the newly installed pipe 8 before joining.

The fixing member 66 is attached to the upper end of the threaded rod 72. The threaded rod 72 is built into the vertical frame 68 by being screwed into a nut body 73 provided at the upper end of the vertical frame 68. By turning the fixing member 66 in one direction, the threaded rod 72 is sent upward from within the vertical frame 68, and the fixing member 66 is raised. Further, by turning the fixing member 66 in the other direction, the threaded rod 72 is fed into the vertical frame 68, and the fixing member 66 is lowered.

The pressing member 62 is located at the lower part of the fixed frame 61, and has a pair of left and right wheels 75 and a wheel mounting bracket 76 that rotatably holds the wheels 75.

The elevating device 63 includes a nut body 78 provided on the vertical frame 68 via a pair of upper and lower mounting plates 77, and an elevating bolt 79 that is screwed into the nut body 78 and passes through the nut body 78 vertically. ing. The lower end of the lifting bolt 79 and the wheel mounting bracket 76 are connected to each other in such a manner that they are relatively rotatable in the circumferential direction of the lifting bolt 79.

By turning the lifting bolt 79 in one direction, the pressing member 62 is lowered, and by turning the lifting bolt 79 in the other direction, the pressing member 62 is raised.

The wheel mounting bracket 76 has a pair of left and right orientation limiting plates 81 (orientation limiting members) that limit the orientation of the pressing member 62 so that the pressing member 62 rolls in the tube axis direction even if the lifting bolt 79 rotates. example) is provided. Since the vertical frame 68 is sandwiched between the bidirectional limiting plates 81, the direction of the wheel 75 is limited to one direction (the longitudinal direction of the horizontal frame 69) in the circumferential direction of the lifting bolt 79. The direction does not change in the circumferential direction around the lifting bolt 79.

As shown in FIGS. 9 and 10, both left and right ends of the inner surface reaction plate 46 can be inserted into and removed from the inner circumferential gap 25 between the tip of the socket 15 and the inner end surface 24 of the socket 16. . The inner surface reaction plate 46 is provided with a pair of left and right eye bolts 90a and 90b.

As shown in FIGS. 12 and 13, a lever hoist is used as the welding traction device 48. Moreover, the joining rope body 47 has a sling belt 92, a chain 93 provided in the joining traction device 48 (lever hoist), and an anchor hook 94 of the lever hoist. Note that the sling belt 92 and chain 93 are joined.

Below, a method of joining the new pipe 8 before joining to the new pipe 7 which has already been installed and has been joined will be explained.

First, as shown in FIG. 11, a first pipe transfer device 37 and a second pipe transfer device 38 are attached to both ends of the newly installed pipe 8 to be joined.

Furthermore, the fixed frame 61 of the centering jig 45 is inserted into the insertion port 15 of the newly installed pipe 8 before joining and attached. At this time, as shown in FIG. 6, by turning the fixing member 66 in one direction and raising it, the height from the lower end 68a of the vertical frame 68 to the fixing member 66 increases, so as shown in FIG. , the fixing member 66 is pressed from below against the upper inner peripheral surface of the insertion port 15 of the newly installed pipe 8 before joining, and the lower end 68a of the vertical frame 68 is pressed against the lower inner peripheral surface of the insertion port 15 of the newly installed pipe 8 before joining. The fixed frame 61 is firmly attached within the socket 15 by being pressed from above.

Thereafter, as shown in FIG. 11, the new pipe 8 before joining is pulled to the near side of the new pipe 7 which has already been joined using a wire 83 or the like. At this time, the sleds 50 of the first and second pipe transfer devices 37 and 38 of the newly installed pipe 8 before joining slide on the inner surface of the existing pipe line 2 in the pipe transfer direction D.

Then, as shown in FIGS. 9, 10, 12, and 13, the operator 85 connects the tip of the insertion port 15 of the new pipe 7 that has been joined and the back end surface 24 of the socket 16 of the new pipe 6 that has been joined. The left and right end portions of the inner surface reaction plate 46 are fitted into the inner circumferential gap 25 formed between them, and the inner surface reaction plate 46 is installed within the joint between the new pipe 6 and the new pipe 7.

Then, one end of the left and right pair of sling belts 92 is connected to the left and right pair of eye bolts 90a, 90b of the inner surface reaction plate 46, and the anchor hooks 94 of the left and right pair of joining traction devices 48 (lever hoists) are connected to the newly installed pipes before joining. By hooking it onto the open end of the socket 16 of 8, the newly installed pipe 7 that has already been joined and the newly installed pipe 8 that has not yet been joined are connected by the pair of left and right joining cables 47.

Thereafter, the operator 86 manually operates the welding traction device 48 and winds up the chain 93 with the welding traction device 48, so that the new pipe 8 before welding can be transferred to the newly joined new pipe 8 as shown in FIG. 7, and as shown in FIG. 15, when the tip of the insertion port 15 of the new pipe 8 before joining comes into contact with the end surface of the socket 16 of the new pipe 7 that has already been joined, the joining pulling device 48 Stop manual operation.

At this time, as shown in FIG. 16, the socket 16 of the new pipe 7 that has been joined is jacked up and installed on the pedestal 12, but the new pipe 8 that has not yet been joined has not been jacked up. The axis 96 of the newly installed pipe 8 before joining is located below the axis 97 of the newly installed pipe 7 that has been joined, and the pressing member 62 of the centering jig 45 is inside the socket 16 of the newly installed pipe 7 that has already been joined. Get into it.

Thereafter, as shown in FIGS. 3 and 16, the diameter of the lock ring 20 is expanded by enlarging the width 28 of the cut portion 22 of the lock ring 20 set in the socket 16 using an expander 29.

Thereafter, as shown in FIG. 17, the operator 85 turns the lifting bolt 79 of the centering jig 45 in one direction using an impact driver or the like. As a result, as shown in FIG. 18, the pressing member 62 descends and the wheel 75 comes into contact with the lower inner circumferential surface of the socket 16 of the new pipe 7 that has already been joined from above. By pressing downward the lower inner circumferential surface of the socket 16 of the newly installed pipe 7, an upward reaction force F is generated on the fixed frame 61, and this reaction force F causes the socket 15 of the newly installed pipe 8 to be joined. It is pushed up against the socket 16 of the newly installed pipe 7. Thereby, the axial center 96 of the newly installed pipe 8 before joining can be aligned with the same height as the axial center 97 of the newly installed pipe 7 that has been joined, and the newly installed pipe 8 can be centered with respect to the newly installed pipe 7.

At this time, since the orientation of the pressing member 62 is limited by the orientation limiting plate 81, the orientation of the pressing member 62 does not change when the lifting bolt 79 is rotated. In addition, since the horizontal frame 69 of the frame body 65 is located immediately behind the pressing member 62, the frame body 65 can be stably installed in the new pipe 8 before joining, and the wheels 75 can be attached to the newly joined pipe as described above. When the lower inner circumferential surface of the socket 16 of No. 7 is pressed downward, the frame main body 65 can be prevented from falling within the newly installed pipe 8 before being joined.

After centering as described above, as shown in FIGS. 19 and 20, the operator 86 manually operates the left and right joining traction device 48 to move both the left and right chains 93 with the joining traction device 48. By winding it up, the new pipe 8 before joining is moved in the pipe transfer direction D, and the insertion port 15 of the new pipe 8 before joining is inserted into the socket 16 of the new pipe 7 that has already been joined.

At this time, the tip of the insertion port 15 of the newly installed tube 8 before joining passes through the inner periphery of the lock ring 20 in an enlarged diameter state and hits the expander 29 almost at the same time, so the expander 29 comes off from the lock ring 20 and locks. The ring 20 reduces in diameter and returns to its original diameter, and hugs the outer periphery of the socket 15.

In addition, since the wheels 75 roll on the lower inner peripheral surface of the socket 16 of the new pipe 7 that has already been joined in the pipe transfer direction D (insertion direction), the socket 15 of the new pipe 8 before joining is It is smoothly joined to the socket 16 of the pipe 7.

Then, as shown in FIG. 21, a plurality of distance pieces 99 are set between the tip of the socket 15 of the newly installed pipe 8 before joining and the back end surface 24 of the socket 16 of the newly installed pipe 7 that has been joined. Then, a gap 100 of a predetermined size is created between the tip of the socket 15 and the rear end surface 24 of the socket 16. The distance pieces 99 are set at a plurality of locations in the tube circumferential direction E, and the bolts 19 in the socket 16 are positioned between adjacent distance pieces 99 in the tube circumferential direction E.

Thereafter, as shown in FIG. 22, the operator 86 removes the centering jig 45 from the insertion port 15 of the newly installed pipe 8. At this time, as shown by the imaginary line in FIG. 6, by turning the fixing member 66 of the centering jig 45 in the other direction and lowering it, the height from the lower end of the frame body 65 to the fixing member 66 is reduced. , the centering jig 45 can be easily removed from the insertion port 15.

Thereafter, the worker 85 uses a torque wrench to turn the bolt 19 (see FIGS. 2 and 21) in the socket 16 of the new pipe 7 that has been joined, and adjusts the protruding length of the bolt 19 from the press ring 18. . Thereby, the pressing force from the press ring 18 to the seal ring 17 can be adjusted. Note that the above adjustment work is performed between adjacent distance pieces 99 in the tube circumferential direction E.

Thereafter, the distance piece 118 is removed, and as shown in FIG. 23, the operator 86 manually operates the welding traction device 48 to wind up the chain 93 with the welding traction device 48, thereby allowing the newly constructed pipe 88 before joining. is moved in the pipe transfer direction D, and the insertion port 15 of the new pipe 8 before joining is inserted into the socket 16 of the new pipe 7 that has been joined to a predetermined position.

Note that the predetermined position is a position where the inner circumferential gap 25 between the tip of the insertion port 15 and the rear end surface 24 of the socket 16 has a predetermined size in the tube axis direction, as shown in FIG. be. Here, as shown by the imaginary line in FIG. 2 and in FIG. 4, the mounting band 51 of the first pipe transfer device 37 of the new pipe 8 before joining comes into contact with the open end surface of the socket 16 of the new pipe 7 that has already been joined. As a result, the insertion port 15 of the newly installed pipe 8 before joining is inserted into the socket 16 of the newly installed pipe 7 that has been joined to a predetermined position.

In this way, the unjoined new pipe 8 is joined to the joined new pipe 7, and then the sling belt 107, the joining traction device 48, and the internal reaction plate 46 are removed and removed, as shown in FIG. , the worker 86 jacks up and lifts the socket 16 of the joined new pipe 8, installs a pedestal 121 made of H-shaped steel, and installs the socket 16 of the new pipe 8 on the pedestal 121.

Thereafter, by repeating the same procedure as above and joining the remaining new pipes 9 to 11, the new pipe 1 is laid within the existing pipe 2, as shown in FIG.

With the centering jig 45 as described above, even if the diameters of the newly installed pipes 5 to 11 are different, the height from the lower end 68a of the vertical frame 68 to the fixed member 66 can be adjusted by raising and lowering the fixing member 66. It can be changed depending on the diameter of the tubes 5 to 11. Thereby, centering work can be performed using the common centering jig 45 even for a plurality of types of newly installed pipes 5 to 11 having different diameters.

Furthermore, as shown in FIGS. 6 and 14, since the fixing member 66 and the lower end 68a of the vertical frame 68 are located on the straight line 71 in the radial direction of the newly installed pipe 8 before joining, the fixing frame 61 The centering jig 45 is made smaller in the axial direction 84 (front-back direction), and the centering jig 45 is thereby made smaller in the tube axis direction 84.

(Second embodiment)
In the first embodiment described above, as shown in FIG. 14, the centering jig 45 is installed in the insertion port 15 of the newly installed pipe 8 before joining, but in the second embodiment, as shown in FIG. As shown in FIGS. 25 to 27, a centering jig 45 is attached to the end of the newly installed pipe 8 on the socket 16 side before joining.

That is, as shown in FIG. 25, the fixing member 66 of the centering jig 45 is attached to the upper inner circumferential surface of the newly installed pipe 8 at a position slightly further back than the rear end surface 24 of the socket 16 of the newly installed pipe 8 before joining. At the same time, the lower end 68a of the vertical frame 68 and the horizontal frame 69 are pressed from above against the lower inner peripheral surface of the newly installed pipe 8 at a position slightly further back than the rear end surface 24 of the socket 16, and the fixed frame is pressed from above. 61 is installed inside the newly installed pipe 8.

According to this, the new pipe 8 before joining is brought closer to the new pipe 7 that has already been joined, and as shown in FIG. The pressing member 62 is brought into contact with the tip of the insertion port 15 and inserted into the insertion port 15 of the newly installed pipe 7 which has already been joined.

Thereafter, as shown in FIGS. 3 and 26, the width 28 of the cut portion 22 of the lock ring 20 set in the socket 16 is expanded using an expander 29, thereby expanding the diameter of the lock ring 20.

Thereafter, the lifting bolt 79 of the centering jig 45 is turned in one direction using an impact driver or the like. As a result, as shown in FIG. 27, the pressing member 62 descends and the wheel 75 comes into contact with the lower inner circumferential surface of the insertion port 15 of the new pipe 7 that has already been joined from above, and the wheel 75 attempts to descend further, but the joining is completed. By pressing downward the lower inner circumferential surface of the socket 15 of the newly installed pipe 7, an upward reaction force F is generated on the fixed frame 61, and this reaction force F causes the socket 16 of the newly installed pipe 8 to be pressed downward. It is pushed up against the insertion port 15 of the newly installed pipe 7 which has already been joined. Thereby, the axial center 96 of the newly installed pipe 8 before joining can be aligned with the same height as the axial center 97 of the newly installed pipe 7 that has been joined, and the newly installed pipe 8 can be centered with respect to the newly installed pipe 7.

(Third embodiment)
In the first and second embodiments described above, the pressing member 62 has wheels 75 as shown in FIGS. 18 and 27, but in the third embodiment described below, as shown in FIG. As shown in FIG. 2, the pressing member 62 has a sled 111 that is slidable in the tube axis direction instead of the wheels 75. The sled 111 is held by a sled attachment bracket 112, and the sled 111 and the sled attachment bracket 112 constitute a pressing member 62. Note that the lower end of the lifting bolt 79 and the sled mounting bracket 112 are connected to each other in a relatively rotatable structure in the circumferential direction of the lifting bolt 79.

According to this, as shown in FIG. 28, after centering the newly installed pipe 8 before joining using the reaction force F on the newly installed pipe 7 that has already been joined, the newly installed pipe 8 before joining is transferred. Move in direction D and insert the socket 15 of the newly installed pipe 8 before joining into the socket 16 of the newly installed pipe 7 that has already been joined. At this time, since the sled 111 slides on the lower inner peripheral surface of the socket 16 of the new pipe 7 that has already been joined in the pipe transfer direction D (insertion direction), the socket 15 of the new pipe 8 before joining is It is smoothly joined to the socket 16 of the pipe 7.

In addition, in the third embodiment described above, as shown in FIG. The jig 45 may be attached inside the end on the socket 16 side.

(Fourth embodiment)
In each of the above embodiments, as shown in FIG. 18, the newly installed pipe 7 that has been joined corresponds to the first pipe and the other pipe, and the newly installed pipe 8 before joining corresponds to the second pipe and the other pipe. However, in the fourth embodiment described below, the centering jig 45 is installed in the insertion port 15 of the newly installed pipe 8 before joining, but as shown in FIGS. 29 and 30, The newly installed pipe 7 corresponds to the first pipe and one of the pipes, the newly installed pipe 8 before joining corresponds to the second pipe and the other pipe, and the centering jig 45 is attached to the newly installed pipe 7 that has been joined. It is attached inside the end on the socket 16 side.

That is, the fixing frame 61 of the centering jig 45 can be removably fixed within the end of the new pipe 7 on the side of the socket 16 that has already been joined, and the pressing member 62 can be attached to the socket 15 of the new pipe 8 before joining. The upper inner circumferential surface of the can be pressed upward.

In this case, the centering jig 45 is attached upside down compared to the first to third embodiments described above. That is, the fixing member 66 of the fixed frame 61 is an example of the lower pressing part, and the upper end 68a of the vertical frame 68 (corresponding to the lower end 68a in the first to third embodiments) is an example of the upper pressing part. .

Note that the fixing member 66 and the upper end 68a of the vertical frame 68 are located on a straight line 71 in the radial direction of the newly installed pipe 7 that has been joined.

The operation of the above configuration will be explained below.

As shown in FIG. 29, when the axis 96 of the newly installed pipe 8 (second pipe) before joining is shifted downward from the axis 97 of the newly installed pipe 7 (first pipe) that has been joined, the center The fixing frame 61 of the removal jig 45 is inserted and attached to the end of the newly installed pipe 7 on the side of the socket 16 which has already been joined. At this time, by rotating the fixing member 66 in one direction and lowering it, the height from the fixing member 66 to the upper end 68a of the vertical frame 68 increases, so that the fixing member 66 is inside the lower part of the new pipe 7 that has been joined. The upper end 68a of the vertical frame 68 and the horizontal frame 69 are pressed from below against the upper inner circumferential surface of the new pipe 7 to which the fixed frame 61 has been joined. It is firmly attached within the end of the socket 16 side.

Thereafter, the new pipe 8 before joining is brought close to the new pipe 7 that has already been joined, and the pressing member 62 is inserted into the new pipe 8 before joining. Then, by turning the lifting bolt 79 of the centering jig 45 in one direction, the pressing member 62 is raised, and as shown in FIG. 15 and presses the upper inner circumferential surface of the insertion port 15 upward, the insertion port 15 of the new pipe 8 before joining is connected to the socket 16 of the new pipe 7 that has already been joined. lift it up.

Thereby, the axial center 96 of the newly installed pipe 8 before joining can be aligned with the same height as the axial center 97 of the newly installed pipe 7 that has been joined, and the newly installed pipe 8 can be centered with respect to the newly installed pipe 7.

In the fourth embodiment described above, the fixing frame 61 of the centering jig 45 is attached to the end of the new pipe 7 that has been joined, on the socket 16 side, and the socket 15 of the new pipe 8 before joining is lifted. Centering is performed by attaching the fixing frame 61 of the centering jig 45 into the insertion port 15 of the new pipe 7 that has already been joined, and lifting the socket 16 of the new pipe 8 before joining. You may do so.

7 New pipes (first pipe, other pipe, one pipe)
8 New pipes (second pipe, one pipe, other pipe)
45 Centering jig 61 Fixed frame 62 Pressing member 63 Lifting device 66 Fixed member (upper pressing part, lower pressing part)
68a End of vertical frame (lower pressing part, upper pressing part)
71 Straight line 78 Nut body 79 Lifting bolt 81 Direction limiting plate (direction limiting member)
84 Tube axis direction 96, 97 Axial center F Reaction force

Claims (9)

A tube centering jig used when joining a second tube to a first tube,
a fixing frame that can be detachably fixed to the inner peripheral surface of the end of either the first tube or the second tube;
a pressing member capable of pressing the inner circumferential surface of the end of the other tube upwardly or downwardly and freely rolling or sliding in the direction of the tube axis;
It has a lifting device that lifts and lowers the pressing member with respect to the fixed frame,
The fixed frame consists of a vertical frame that stands up in the vertical direction, a horizontal frame attached to one end of the vertical frame, an upper pressing part that is pressed against the upper part of the inner peripheral surface of the end of one tube, and one of the vertical frames. and a lower pressing part pressed against the lower part of the inner circumferential surface of the end of the pipe,
The upper pressing part and the lower pressing part are located in the radial direction of one pipe and on a straight line passing through the vertical frame ,
The pressing member is located on the opposite side of the vertical frame from the side where the horizontal frame extends in the horizontal direction from the end of the vertical frame,
A pipe centering jig, characterized in that the horizontal frame is pressed against the upper or lower part of the inner circumferential surface of the end of one pipe. one tube is a second tube and the other tube is a first tube;
a fixed frame is removably securable within the end of the second tube;
2. The tube centering jig according to claim 1, wherein the pressing member is capable of pressing downwardly the lower inner circumferential surface of the end of the first tube. one tube is a first tube, the other tube is a second tube,
a fixed frame is removably securable within the end of the first tube;
2. The pipe centering jig according to claim 1, wherein the pressing member is capable of pressing upwardly the upper inner circumferential surface of the end of the second pipe. The tube centering jig according to any one of claims 1 to 3, wherein the upper pressing part or the lower pressing part is vertically movable. The lifting device includes a nut body provided on a fixed frame, and a lifting bolt that is screwed into the nut body and passes through the nut body vertically,
The pipe centering jig according to any one of claims 1 to 4, wherein the pressing member is provided at an end of the lifting bolt. The pipe according to claim 5, further comprising a direction limiting member that limits the direction of the pressing member so that the pressing member rolls or slides in the direction of the pipe axis even when the lifting bolt rotates. Centering jig. The tube centering jig according to any one of claims 1 to 6, wherein the fixed frame is formed in a triangular frame shape when viewed from the side. A method for centering a pipe using the centering jig according to claim 3, comprising:
attaching the fixed frame within the end of the first tube with the axis of the second tube being shifted downward from the axis of the first tube;
bringing the end of the second tube close to the end of the first tube and inserting the pressing member into the end of the second tube;
The lifting device is operated to raise the pressing member, and the pressing member pushes the upper inner circumferential surface of the end of the second pipe upward from below, thereby moving the end of the second pipe to the end of the first pipe. A method for centering a tube, the method comprising: lifting the second tube relative to the second tube and moving the axis of the second tube upward. A method for centering a pipe using the centering jig according to claim 2, comprising:
attaching the fixed frame within the end of the second tube with the axis of the second tube being offset below the axis of the first tube;
bringing the end of the second tube close to the end of the first tube and inserting the pressing member into the end of the first tube;
The lifting device is operated to lower the pressing member, and the pressing member pushes the lower inner circumferential surface of the end of the first tube downward from above, thereby utilizing the upward reaction force generated on the fixed frame to lower the second tube. A method for centering a tube, comprising pushing up an end of the tube relative to an end of the first tube and moving the axis of the second tube upward.

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