JP2021085445A - Ring device and pipe transfer method using ring device - Google Patents

Abstract

To provide a ring device capable of installing a traction device which tracts a new pipe, within an existing duct easily and in a freely removable manner.SOLUTION: A ring device 41 comprises a ring body 53 which is pressed to an inner peripheral surface of an existing duct, and a mounting frame 54 which is provided in the ring body 53. The ring body 53 is divided into a plurality of arcuate split ring pieces 55-58 in a circumferential direction C, a connection member is provided for connecting an end of one split ring piece and an end of the other split ring piece, the ring pieces being adjacent to each other in the circumferential direction C, and interval adjusting members 73 and 81 are provided for enlarging/reducing intervals 72 and 80 between the end of the one split ring piece and the end of the other split ring piece in the circumferential direction C. Mounting parts 88a and 88b on which a traction device 43 tracing a new pipe inside of the existing duct can be mounted are provided in the mounting frame 54.SELECTED DRAWING: Figure 6

Description

The present invention relates to a ring device installed in an existing pipeline and a method of transferring the pipe using the ring device when laying a new pipe in the existing pipeline.

Conventionally, as shown in FIG. 32, when laying a new pipe 201 in an existing pipe 200 buried in the ground, a sled 202 is attached to the lower ends of both ends of the new pipe 201, and a tow rope 203 is attached to the new pipe 201. By connecting and winding the towing rope 203 with a winch (traction device), the new pipe 201 is towed and transferred.

The method of transferring the pipe as described above is described in, for example, Patent Document 1 below.

Akira Jikai 60-11807

However, in the above-mentioned conventional type, since the winch is installed on the ground, the distance from the winch to the new pipe 201 in the existing pipeline 200 is long, and it is necessary to lengthen the towing rope 203 accordingly. In addition, it may be difficult to secure a space for installing the winch on the ground.

As a countermeasure against such a problem, it is conceivable to detachably install the winch in the existing pipeline 200.

However, in order to install the winch in the existing pipeline 200, it is necessary to fix the winch to the lower inner surface of the existing pipeline 200 by using bolts or the like, and for that purpose, a bolt hole is formed in the existing pipeline 200, etc. It had to be machined, which took time and effort.

An object of the present invention is to provide a ring device that can easily and detachably install a traction device that pulls a new pipe in an existing pipeline, and a method of transferring the pipe using the ring device.

In order to achieve the above object, the first invention is a ring device installed in an existing pipeline when laying a new pipe in the existing pipeline.
It has a ring body that is pressed against the inner peripheral surface of the existing pipeline and a mounting frame provided on the ring body.
The ring body is divided into a plurality of arc-shaped divided ring pieces in the circumferential direction.
The distance between the connecting member that connects the end of one split ring piece and the end of the other split ring piece that are adjacent to each other in the circumferential direction, and the end of one split ring piece and the end of the other split ring piece. Is equipped with an interval adjusting member that expands and contracts in the circumferential direction.
The mounting frame is provided with a mounting portion to which a traction device for pulling a new pipe can be mounted in the existing pipeline.

According to this, the end of one split ring piece and the end of the other split ring piece that are adjacent to each other in the circumferential direction are connected by a connecting member, and the end of one split ring piece and the end of the other split ring piece are connected. The ring body is fitted into the existing pipeline in a state where the distance from the portion is reduced by the interval adjusting member. After that, by increasing the distance between the end of one split ring piece and the end of the other split ring piece with the spacing adjusting member, each split ring piece is pressed against the inner peripheral surface of the existing pipeline, and the ring device. Is fixed in the existing pipeline.

Then, by attaching the traction device to the attachment portion of the ring device, the traction device is installed in the existing pipeline via the ring device. At this time, it is not necessary to machine the existing pipeline, and the traction device can be easily installed in the existing pipeline.

After that, by reducing the distance between the end of one split ring piece and the end of the other split ring piece with the spacing adjusting member, the pressing action of each split ring piece against the inner peripheral surface of the existing pipeline is released. The ring device can be separated from the inner peripheral surface of the existing pipeline. Thereby, the ring device can be easily removed.

In the ring device according to the second invention, the mounting frame is detachable from the ring body and is mounted over a plurality of divided ring pieces.

According to this, the mounting position of the traction device can be changed while maintaining the strength of the ring device.

In the ring device according to the third invention, the mounting frame protrudes from the ring body in the tube axis direction.
A traction device is arranged between the ring body and the mounting portion in the pipe axis direction.

In the ring device according to the fourth invention, each divided ring piece has flanges at both ends in the circumferential direction.
The connecting member has a connecting bolt and a connecting nut that connect the flanges of one split ring piece and the flanges of the other split ring pieces that face each other in the circumferential direction.
The spacing adjustment member consists of spacing adjustment bolts.
The spacing adjusting bolt is screwed into a screw hole formed in the flange of one dividing ring piece, penetrates the flange in the circumferential direction, and its tip abuts on the flange of the other dividing ring piece.

According to this, by turning the spacing adjustment bolt in one direction, the distance between the flange of one dividing ring piece and the flange of the other split ring piece is increased, and by turning the spacing adjusting bolt in the other direction, one of them is used. The distance between the flange of the split ring piece and the flange of the other split ring piece is reduced.

In the ring device according to the fifth invention, the thickness of the split ring piece located at the lower part of the ring body in the radial direction is thinner than the thickness of the other split ring pieces in the radial direction.

According to this, when the ring device is fixed in the existing pipeline, the step between the inner circumference of the split ring piece located at the lower part of the ring body and the inner circumference of the existing pipeline is reduced, so that the mounting frame is attached to the ring body. When a new pipe or the like passes through the ring body in the state of being removed from the ring body, the split ring piece located at the lower part of the ring body can be smoothly overcome.

The sixth invention is a method for transferring a pipe using the ring device according to any one of the first to fourth inventions.
Fix the ring body of the ring device to the inner peripheral surface of the existing pipeline,
Attach the traction device to the mounting part of the ring device,
A traction device is used to tow a new pipe.

According to this, the new pipe is towed by the traction device and transferred in the existing pipe.

In the method of transferring a pipe in the seventh invention, the traction device is arranged at a position opposite to the newly installed pipe to be towed with respect to the ring body of the ring device.

According to this, when a worker operates a towing device in an existing pipeline to pull a new pipe, even if the ring device is pulled and falls down, the ring device is not on the worker side. , Fall to the side of the new pipe to be towed. Therefore, the safety of the operator can be ensured.

As described above, according to the present invention, the traction device is installed in the existing pipeline by fixing the ring device in the existing pipeline and attaching the traction device to the attachment portion of the ring device. At this time, it is not necessary to machine the existing pipeline, and the traction device can be easily installed in the existing pipeline.

It is a figure of the pipeline laid in the ground in the 1st Embodiment of this invention. The same is a cross-sectional view of the joint portion between the newly installed pipes of the pipeline. Similarly, it is a figure when the cut portion of the lock ring provided in the joint portion between newly constructed pipes of a pipeline is enlarged by an expander. It is a cross-sectional view of a part of the pipeline notched. It is the front view of the 1st and 2nd pipe transfer apparatus attached to the new pipe of the pipeline. It is the front view of the 1st and 2nd ring apparatus used when laying a new pipe. FIG. 6 is a view taken along the line XX in FIG. It is a partially cutaway side view of the first and second ring devices. It is a partially enlarged sectional view of the 1st and 2nd ring apparatus. The same is a front view of the first and second ring devices, showing a state in which the first and second ring devices are fixed in the existing pipeline. It is a side view of the centering jig used when laying a new pipe. It is the front view of the centering jig used when laying a new pipe. It is a front view of the inner reaction force plate used when laying a new pipe. In the same figure, the inner reaction force plate used when laying a new pipe is set in the inner peripheral side gap of the joint portion between the new pipes. It is a figure explaining the method of laying a new pipe in an existing pipe. It is a figure explaining the method of laying a new pipe in an existing pipe. It is a figure explaining the method of laying a new pipe in an existing pipe. It is a figure explaining the method of laying a new pipe in an existing pipe. It is a figure explaining the method of laying a new pipe in an existing pipe. It is a top view of the new pipes 6-8 in FIG. It is a figure explaining the method of laying a new pipe in an existing pipe. It is a figure explaining the method of laying a new pipe in an existing pipe. It is a figure explaining the method of laying a new pipe in an existing pipe, and shows the procedure of centering work. It is a figure explaining the method of laying a new pipe in an existing pipe, and shows the procedure of centering work. It is a figure explaining the method of laying a new pipe in an existing pipe, and shows the procedure of centering work. It is a figure explaining the method of laying a new pipe in an existing pipe. It is a figure explaining the method of laying a new pipe in an existing pipe. It is a figure explaining the method of laying a new pipe in an existing pipe. It is a figure explaining the method of laying a new pipe in an existing pipe. It is a figure explaining the method of laying a new pipe in an existing pipe. It is a figure explaining the method of laying a new pipe in an existing pipe. It is a figure which shows the laying method of the conventional pipe.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

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

In the existing pipeline 2, a plurality of pedestals 121 made of H-shaped steel are installed, and the receiving ports 16 of the newly installed pipes 5 to 11 are supported and installed on the pedestal 121.

As shown in FIG. 2, the inner circumference of the receiving port 16 is provided with a seal ring 17, a push ring 18, a plurality of bolts 19, a lock ring 20, and an annular spring 21. The seal ring 17 seals between the inner circumference of the receiving port 16 and the outer circumference of the insertion port 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 bolt 19 is screwed into the push ring 18 at a plurality of points in the pipe circumferential direction E, and the pressing force from the push ring 18 to the seal ring 17 is adjusted by adjusting the protruding length of the bolt 19 from the push ring 18. Can be done.

A recess 23 is formed on the outer peripheral surface of the insertion port 15 over the entire circumference. The lock ring 20 is a ring having a split structure in which one portion is cut, and since it is pushed inward in the pipe radial direction by a spring 21, it is held on the outer peripheral surface in 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 the expander 29, and is reduced in diameter by removing the magnifier 29 from the cut portion 22 to obtain the original diameter. It has elasticity that returns to the diameter.

As shown in FIG. 2, an inner peripheral side gap 25 is formed over the entire circumference between the tip of the insertion port 15 and the back end surface 24 of the receiving port 16. Since 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 with respect to the receiving port 16 in the detachment direction A 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 insertion port 15 with respect to the receiving port 16 in the insertion direction B is limited.

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

The new pipeline 1 is laid in the existing pipeline 2 by the pipe-in-pipe method. At this time, the first and second pipe transfer devices 37 and 38, the first wire 39 (an example of the first cord), and the first Two wires 40 (an example of a second cord), first and second ring devices 41 and 42, and first and second traction devices 43 and 44 for traction of new pipes 5 to 11 in the existing pipeline 2. , A centering jig 45, an inner reaction force plate 46, a joining cord 47, a joining traction device 48, and the like are used.

As shown in FIGS. 4 and 5, the first pipe transfer device 37 has a pair of left and right sleds 50 that can slide on the inner surface of the existing pipe 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. The left and right sleds 50 are provided on the mounting band 51, and a pair of left and right connecting holes 52a and 52b are formed in the connecting frame 52. 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 new pipe 5 to 11 on the insertion port 15 side, and the second pipe transfer device 38 receives the new pipes 5 to 11. By attaching to the end on the mouth 16 side and sliding the warp 50 with respect to the inner peripheral surface of the existing pipeline 2, each of the new pipes 5 to 11 can be transferred in the existing pipeline 2.

It should be noted that the inner peripheral side gap 25 shown in FIG. 2 is a pipe with the end on the insertion port 15 side and the end on the receiving port 16 side with the first and second pipe transfer devices 37 and 38 attached. It corresponds to the position where the size becomes a predetermined size in the axial direction.

As shown in FIGS. 6 to 9, the first ring device 41 includes a ring body 53 that is pressed against the inner peripheral surface of the existing pipeline 2, and a mounting frame 54 that is detachably provided on the ring body 53. doing. The ring body 53 is divided into four arc-shaped first to fourth divided ring pieces 55 to 58 in the circumferential direction C. The first to fourth divided ring pieces 55 to 58 each have a main body frame 59 to 61 and square flat plate-shaped flanges 63 to 66 provided at both ends of the main body frames 59 to 61 in the circumferential direction C. There is. The first divided ring piece 55 and the fourth divided ring piece 58 are arranged to face each other in the vertical direction, and the second divided ring piece 56 and the third divided ring piece 57 are arranged to face each other in the left and right direction.

The flange 65 of the second and third divided ring pieces 56 and 57 and the flange 66 of the fourth divided ring piece 58 facing each other in the circumferential direction C are connected by a connecting member 78. The connecting member 78 has a connecting bolt 68 inserted into the through holes 70 and 71 formed in the flanges 65 and 66, and a nut 69 screwed into the connecting bolt 68.

Further, a plurality of spacing adjusting bolts 73 (an example of a spacing adjusting member) for expanding / contracting the spacing 72 between the flange 65 and the flange 66 in the circumferential direction C are provided at both ends of the flange 66 of the fourth divided ring piece 58. ing. Both spacing adjusting bolts 73 are screwed into screw holes 74 formed in the flange 66 and penetrate the flange 66 in the circumferential direction C, and the tips of the two spacing adjusting bolts 73 are in contact with the flange 65 of the other party. By turning both spacing adjustment bolts 73 in one direction, the spacing 72 is expanded as shown by the solid line in FIG. 9, and by turning both spacing adjusting bolts 73 in the other direction, the spacing is as shown by the virtual line in FIG. 72 shrinks.

Similarly, the flange 63 of the first split ring piece 55 facing each other in the circumferential direction C and the flange 64 of the second and third split ring pieces 56 and 57 are connected by a connecting member 79. The connecting member 79 has a connecting bolt 76 inserted into the through holes 70 and 71 formed in the flanges 63 and 64, and a nut 77 screwed into the connecting bolt 76.

Further, at both ends of the flanges 64 of the second and third divided ring pieces 56 and 57, spacing adjusting bolts 81 for expanding or contracting the spacing 80 between the flange 63 and the flange 64 in the circumferential direction C (an example of the spacing adjusting member). ) Are provided. Both spacing adjusting bolts 81 are screwed into screw holes 74 formed in the flange 64 and penetrate the flange 64 in the circumferential direction C, and the tips of the two spacing adjusting bolts 81 are in contact with the mating flange 63. By turning both spacing adjusting bolts 81 in one direction, the spacing 80 is expanded, and by turning both spacing adjusting bolts 81 in the other direction, the spacing 80 is reduced.

As shown in FIG. 6, the thickness T1 in the radial direction of the main body frame 61 of the fourth divided ring piece 58 located at the lower part of the ring main body 53 is the thickness T1 of the remaining first to third divided ring pieces 55 to 57. The thickness of each of the main body frames 59 and 60 is set to be thinner than the thickness T2 in the radial direction.

The mounting frame 54 protrudes from the ring main body 53 in the pipe axis direction G, and one end thereof is detachably attached to the main body frame 61 of the fourth divided ring piece 58, and a pair of left and right lower frames 85 and both lower frames 85. It has a connecting frame 86 provided between the other ends of the frame and a pair of left and right inclined frames 87.

One end of the lower frame 85 is detachably connected to the main body frame 61 of the fourth divided ring piece 58 via bolts and nuts 89. Further, the upper ends of the both inclined frames 87 are detachably attached to the main body frames 60 of the second and third divided ring pieces 56 and 57 via bolts and nuts 90, and the lower ends of the both inclined frames 87 are both ends of the connecting frame 86. It is attached to. As a result, the mounting frame 54 is mounted across the second to fourth split ring pieces 56 to 58 (an example of a plurality of split ring pieces).

Further, the connecting frame 86 is provided with a pair of left and right eyebolts 88a and 88b (an example of a mounting portion) to which the first traction device 43 can be mounted.

With the intervals 72 and 80 reduced by turning the interval adjusting bolts 73 and 81 in the other direction, the first ring device 41 is fitted into the existing pipeline 2, and the interval adjusting bolts 73 and 81 are rotated in one direction. By enlarging the intervals 72 and 80, as shown in FIG. 10, the first to fourth divided ring pieces 55 to 58 move outward in the radial direction and are pressed against the inner peripheral surface of the existing pipeline 2. The first ring device 41 can be fixed in the existing pipeline 2.

Further, the second ring device 42 has the same configuration as the first ring device 41, and can be fixed in the existing pipeline 2 in the same manner as the first ring device 41.

As shown in FIG. 8, the first traction device 43 is a universal manual winch, lever hoist, or the like (an example of a traction device) capable of winding and sending out the first wire 39, and is the first ring device 41. It has an anchor hook 82 that can be hooked on the eyebolts 88a and 88b, and a hook 83 provided at the tip of the first wire 39.

By locking the anchor hooks 82 of the two left and right first traction devices 43 to one eyebolt 88a and the other eyebolt 88b of the first ring device 41, respectively, these both first traction devices 43 are in the pipe axis direction G. It is arranged between the ring body 53 and the eyebolts 88a and 88b.

Similarly, the second traction device 44 is a manual winch, lever hoist, or the like (an example of the traction device) capable of winding and sending out the second wire 40, and is attached to the eyebolts 88a and 88b of the second ring device 42. It has an anchor hook 82 that can be hooked, and a hook 83 provided at the tip of the second wire 40.

By locking the anchor hooks 82 of the two left and right second traction devices 44 to one eyebolt 88a and the other eyebolt 88b of the second ring device 42, respectively, these two second traction devices 44 are in the pipe axis direction G. It is arranged between the ring body 53 and the eyebolts 88a and 88b.

As shown in FIGS. 11 and 12, the centering jig 45 is a main body frame 91 that can be detachably fixed in the insertion port 15, wheels 92, and an elevating device that raises and lowers the wheels 92 with respect to the main body frame 91. It has 93 and. The main body frame 91 is formed in a triangular frame shape in a side view, and has a vertical frame 94 that stands up in the vertical direction, a horizontal frame 95 whose one end is attached to the lower end of the vertical frame 94, and the upper end of the vertical frame 94. It has an inclined frame 96 attached between the portion and the other end of the horizontal frame 95.

A fixing member 99 that can be moved in the vertical direction by a screw rod 98 is provided at the upper end of the vertical frame 94. The screw rod 98 is built in the vertical frame 94, and the fixing member 99 is attached to the upper end of the screw rod 98. By turning the fixing member 99 in one direction, the screw rod 98 is sent upward from the inside of the vertical frame 94, and the fixing member 99 rises. Further, by turning the fixing member 99 in the other direction, the screw rod 98 is fed into the vertical frame 94, and the fixing member 99 is lowered.

A pair of left and right wheels 92 are rotatably provided on the wheel mounting bracket 100. The elevating device 93 has a nut body 101 provided on the vertical frame 94, and an elevating bolt 102 that is screwed into the nut body 101 and penetrates the nut body 101 up and down. A wheel mounting bracket 100 is provided at the lower end of the elevating bolt 102.

The wheel mounting bracket 100 is provided with a pair of left and right orientation limiting plates 103 that limit the orientation of the wheels 92. Since the vertical frame 94 is sandwiched between the bidirectional limiting plates 103, the direction of the wheels 92 is limited to one direction (longitudinal direction of the horizontal frame 95) in the circumferential direction of the elevating bolt 102, and the elevating bolt 102. It does not change in the circumferential direction around.

The wheel 92 is lowered by turning the elevating bolt 102 in one direction, and the wheel 92 is raised by turning the elevating bolt 102 in the other direction.

As shown in FIGS. 13 and 14, the left and right ends of the inner reaction force plate 46 can be inserted into and removed from the inner peripheral side gap 25 between the tip of the insertion port 15 and the back end surface 24 of the receiving port 16. .. A pair of left and right eyebolts 105a and 105b are provided on the inner reaction force plate 46.

As shown in FIG. 19, a lever hoist is used in the joining traction device 48. Further, the joining cord 47 has a sling belt 107, a chain 108 provided in the joining traction device 48 (lever hoist), and an anchor hook 84 provided in the lever hoist. The sling belt 107 and the chain 108 are joined to each other.

The method of laying the pipe for laying the new pipe 1 in the existing pipe 2 will be described below.

As shown in FIG. 15, the insertion port 15 of the newly joined pipe 7 already installed in the gradient pipeline portion 31 is inserted into the receiving port 16 of the adjacent new pipe 6 and the tip of the insertion port 15 is inserted. Both new pipes 6 and 7 are joined in a state where an inner peripheral side gap 25 (see FIG. 2) is formed between the receiving port 16 and the back end surface of the receiving port 16.

Then, as shown by the virtual line in FIG. 9, both flanges 65 and 66 of the ring body 53 of the first ring device 41 are connected by the connecting bolt 68 and the nut 69, and the spacing adjusting bolt 73 is turned in the other direction to both flanges. The distance 72 between 65 and 66 is reduced, the flanges 63 and 64 are connected by the connecting bolt 76 and the nut 77, and the distance adjusting bolt 81 is turned in the other direction to reduce the distance 80 between the flanges 63 and 64. ..

In this state, the ring body 53 of the first ring device 41 is fitted into the lower horizontal pipeline portion 32 of the existing pipeline 2. After that, as shown by the solid line in FIG. 9, the spacing adjusting bolt 73 of the first ring device 41 is turned in one direction to expand the spacing 72 between the flanges 65 and 66, and the connecting bolt 68 and the nut 69 are tightened. The spacing adjusting bolt 81 is turned in one direction to increase the spacing 80 between the flanges 63 and 64, and the connecting bolt 76 and the nut 77 are tightened.

As a result, the distances 72 and 80 between the ends of the first to fourth divided ring pieces 55 to 58 of the first ring device 41 are expanded, and as shown in FIG. 10, the first to fourth divided ring pieces 55 ~ 58 is pressed against the inner peripheral surface of the lower horizontal pipeline portion 32 of the existing pipeline 2, and the first ring device 41 is fixed in the lower horizontal pipeline portion 32.

Further, in the same manner as the first ring device 41, the second ring device 42 is fixed in the upper horizontal pipeline portion 33 of the existing pipeline 2.

After that, as shown in FIGS. 8 and 15, the anchor hooks 82 of the first traction device 43 are hooked on the eyebolts 88a and 88b of the first ring device 41, respectively, and a pair of left and right (that is, two) first traction devices 43 are hooked. Is connected to the first ring device 41. At this time, the first traction device 43 is arranged with respect to the ring main body 53 of the first ring device 41 at a position opposite to the new pipe 8 before joining to be joined.

Similarly, the anchor hooks 82 of the second traction device 44 are hooked on the eyebolts 88a and 88b of the second ring device 42, respectively, and a pair of left and right (that is, two) second traction devices 44 are connected to the second ring device 42. Keep it. At this time, the second traction device 44 is arranged at a position opposite to the new pipe 8 before joining with respect to the ring main body 53 of the second ring device 42.

As a result, the first and second traction devices 43 and 44 are installed in the existing pipeline 2 via the first and second ring devices 41 and 42. At this time, it is not necessary to machine the existing pipeline 2, and the first and second traction devices 43 and 44 can be easily installed in the existing pipeline 2.

Further, the first pipe transfer device 37 and the second pipe transfer device 38 are attached to both ends of the new pipe 8 before joining.

Further, the hook 83 (see FIG. 8) of the first wire 39 of both the left and right first traction devices 43 is hooked on the connecting holes 52a and 52b (see FIG. 5) of the first pipe transfer device 37 of the new pipe 8 before joining. , As shown in FIG. 15, the first wire 39 is connected to the first pipe transfer device 37, and the hook 83 (see FIG. 8) of the second wire 40 of both the left and right second traction devices 44 is connected to the new pipe 8 before joining. The second wire 40 is connected to the second pipe transfer device 38 by hooking the connecting holes 52a and 52b (see FIG. 5) of the second pipe transfer device 38 as shown in FIG.

In addition, a lubricant is applied to the insertion port 15 of the new pipe 8 before joining. Further, the seal ring 17, the push ring 18, the bolt 19, the lock ring 20, and the spring 21 are set in the receiving port 16 of the newly joined pipe 7 already installed in the gradient pipeline portion 31.

Further, the first worker 111 inserts and attaches the main body frame 91 of the centering jig 45 into the insertion port 15 of the new pipe 8 before joining. At this time, by turning the fixing member 99 in one direction to raise it, the height from the lower end of the main body frame 91 to the fixing member 99 increases. Therefore, as shown in FIG. 12, the fixing member 99 and the main body frame 91 The lower end is strongly pressed against the inner surface of the insertion slot 15, and the main body frame 91 is firmly mounted in the insertion slot 15.

After that, as shown in FIG. 16, the second worker 112 manually operates the left and right first traction devices 43 to wind up the left and right first wires 39, and the third worker 113 manually operates both the left and right first traction devices 43. By manually operating the 44 to send out the left and right second wires 40, the left and right first wires 39 are pulled in the pipe pulling direction D, and the left and right second wires 40 are pulled out in the pipe pulling direction D before joining. The new pipe 8 is towed and transferred to the gradient pipeline portion 31.

At this time, the second worker 112 stands on the side opposite to the new pipe 8 before joining with respect to the ring body 53 of the first ring device 41, and manually operates the first traction device 43. Even if the 1-ring device 41 is pulled by the first wire 39 and falls down, it falls not on the side of the second worker 112 but on the side of the newly installed pipe 8 to be pulled. As a result, the safety of the second worker 112 can be ensured.

Similarly, the third worker 113 stands on the side opposite to the new pipe 8 before joining with respect to the ring body 53 of the second ring device 42, and manually operates the second traction device 44. Even if the 2 ring device 42 is pulled by the second wire 40 and falls down, it falls not on the side of the third worker 113 but on the side of the newly installed pipe 8 to be pulled. As a result, the safety of the third worker 113 can be ensured.

As shown in FIG. 17, the new pipe 8 before joining is towed by the first wire 39 to be transferred diagonally downward to the gradient pipeline portion 31, and the newly joined pipe already installed in the gradient pipeline portion 31. When reaching the front side of No. 7, as shown in FIG. 18, the second operator 112 connects the hook 83 of the first wire 39 (see FIG. 8) to the first pipe transfer device 37 of the new pipe 8 before joining. The first wire 39 is removed from the first pipe transfer device 37 by separating from the holes 52a and 52b (see FIG. 5). At this time, by keeping both the left and right second wires 40 in a stretched state, the newly installed pipe 8 before joining does not slide down the gradient pipeline portion 31, and safety is ensured.

After that, as shown in FIGS. 13, 14, 19, and 20, the second worker 112 moves the tip of the insertion port 15 of the newly joined pipe 7 and the back of the receiving port 16 of the newly joined pipe 6. The left and right ends of the inner surface reaction force plate 46 are fitted into the inner peripheral side gap 25 formed between the end surface 24, and the inner surface reaction force plate 46 is attached in the joint portion between the new pipe 6 and the new pipe 7.

Then, the second worker 112 connects one end of the pair of left and right sling belts 107 to the pair of left and right eyebolts 105a and 105b of the inner reaction force plate 46, and the first worker 111 connects the pair of left and right joint traction devices 48 (lever). By hooking the anchor hook 84 of the hoist) on the open end of the receiving port 16 of the new pipe 8 before joining, the new pipe 7 that has been joined and the new pipe 8 before joining are connected by the joining cord 47.

After that, the first worker 111 manually operates the left and right joint traction devices 48 to wind up the chain 108 with the joining traction device 48, and the third worker 113 manually operates both the left and right second traction devices 44. By operating and sending out both the left and right second wires 40, as shown in FIG. 21, the new pipe 8 before joining is moved toward the newly joined pipe 7, and as shown in FIG. 22, before joining. When the tip of the insertion port 15 of the new pipe 8 of the above comes into contact with the end surface of the receiving port 16 of the newly installed pipe 7, the first operator 111 stops the manual operation of the joining traction device 48 and the third operation Person 113 stops the manual operation of the second traction device 44. As a result, both the left and right second wires 40 are held in a stretched state without being loosened.

At this time, as shown in FIG. 23, the receiving port 16 of the newly joined pipe 7 is jacked up and installed on the pedestal 121, but the new pipe 8 before joining has not been jacked up yet. The axis 115 of the new pipe 8 before joining is located below the axis 116 of the new pipe 7 that has been joined, and the wheel 92 of the centering jig 45 is inside the socket 16 of the new pipe 7 that has been joined. Get in.

After that, the second worker 112 applies the lubricant to the seal ring 17 set in the receiving port 16 of the newly installed pipe 7 that has been joined, and sets it in the receiving port 16 as shown in FIGS. 3 and 23. The width 28 of the cut portion 22 of the lock ring 20 is enlarged by the magnifier 29. As a result, the diameter of the lock ring 20 is expanded.

After that, as shown in FIG. 24, the second worker 112 uses an impact driver or the like to turn the lifting bolt 102 of the centering jig 45 in one direction. As a result, as shown in FIG. 25, the wheel 92 descends and comes into contact with the lower inner surface of the socket 16 of the newly joined pipe 7, and the wheel 92 tries to descend and the socket 16 of the newly joined pipe 7 is joined. By pressing the inner surface of the new pipe downward, the insertion port 15 of the new pipe 8 before joining is moved upward by the reaction force of this pressing force, and the axis 115 of the new pipe 8 before joining is joined to the new pipe 7 Align with the same height as the axis 116 of.

Further, as shown in FIG. 24, the third worker 113 manually operates the second traction device 44 on the left side of the left and right second traction devices 44 to wind up the second wire 40 on the left side, thereby winding the second wire 40 on the left side. The second wire 40 is pulled in the direction opposite to the pipe pulling direction D, and the insertion port 15 of the new pipe 8 before joining moves to the left side. Further, when the third worker 113 manually operates the second traction device 44 on the right side to wind up the second wire 40 on the right side, the second wire 40 on the right side is pulled in the direction opposite to the pipe traction direction D. , The insertion port 15 of the new pipe 8 before joining moves to the right side.

By moving the insertion port 15 of the new pipe 8 before joining in the left-right direction with respect to the receiving port 16 of the new pipe 7 that has been joined in this way, the axial center 115 of the new pipe 8 before joining is moved in the left-right direction. It can be aligned with the axis 116 of the newly installed pipe 7 that has been joined. As a result, the axis 115 of the new pipe 8 before joining can be aligned with the axis 116 of the new pipe 7 that has been joined in the vertical and horizontal directions, and the center of the new pipe 8 before joining can be aligned with the new pipe 7 that has been joined. Match the center.

After centering as described above, as shown in FIGS. 26 and 27, the second worker 112 retracts from the joined new pipe 7 into the new pipe 5, and the first worker 111 retracts into the new pipe 5. The left and right traction devices 48 are manually operated to wind the left and right chains 108 by the joining traction device 48, and the third operator 113 manually operates the left and right second traction devices 44 to wind the left and right chains 108. By sending out the 2 wires 40, the new pipe 8 before joining is moved in the pipe towing direction D, and the insertion port 15 of the new pipe 8 before joining is inserted into the receiving port 16 of the new pipe 7 that has been joined.

At this time, since the tip of the insertion port 15 of the new pipe 8 before joining hits the expander 29 almost at the same time as passing through the inner circumference of the lock ring 20 in the enlarged diameter state, the expander 29 is disengaged from the lock ring 20 and locked. The ring 20 shrinks in diameter, returns to its original diameter, and clings to the outer circumference of the insertion port 15.

Further, since the wheels 92 roll on the lower inner peripheral surface of the receiving port 16 of the newly installed pipe 7 in the pipe pulling direction D (insertion direction), the insertion port 15 of the new pipe 8 before joining is newly installed. It is smoothly joined to the receiving port 16 of the pipe 7.

Then, as shown in FIG. 28, a plurality of distance pieces 118 are set between the tip end portion of the insertion port 15 of the new pipe 8 before joining and the back end surface 24 of the receiving port 16 of the new pipe 7 that has been joined. A gap 119 of a predetermined size is provided between the tip end portion of the insertion port 15 and the back end surface 24 of the receiving port 16. The distance pieces 118 are set at a plurality of locations in the pipe circumferential direction E, and the bolts 19 in the receiving port 16 are located between the adjacent distance pieces 118 in the pipe circumferential direction E.

After that, as shown in FIG. 29, the first worker 111 removes the centering jig 45 from the inside of the insertion port 15 of the new pipe 8. At this time, as shown by the virtual line in FIG. 11, the height from the lower end of the main body frame 91 to the fixing member 99 is reduced by turning the fixing member 99 of the centering jig 45 in the other direction and lowering the fixing member 99. , The centering jig 45 is easily removed from the inside of the insertion slot 15.

After that, the second worker 112 turns the bolt 19 (see FIGS. 2 and 28) in the receiving port 16 of the newly installed pipe 7 which has been joined by using a torque wrench, and adjusts the protruding length of the bolt 19 from the push ring 18. Adjust. Thereby, the pressing force from the pressing ring 18 to the seal ring 17 can be adjusted. The adjustment work is performed between the adjacent distance pieces 118 in the pipe circumferential direction E.

After that, the second worker 112 removes the distance piece 118, and as shown in FIG. 30, the first worker 111 manually operates the joining traction device 48 to wind up the chain 108 with the joining traction device 48. At the same time, the third worker 113 manually operates both the left and right second traction devices 44 to send out both the left and right second wires 40, thereby moving the new pipe 8 before joining in the pipe traction direction D, and before joining. The insertion port 15 of the new pipe 8 is inserted into the receiving port 16 of the new pipe 7 that has been joined to a predetermined position.

As shown in FIG. 2, the predetermined position is a position where the inner peripheral side gap 25 between the tip of the insertion port 15 and the back end surface 24 of the receiving port 16 has a predetermined size in the pipe axis direction G. Is. Here, as shown in the virtual line of FIG. 2 and FIG. 4, the attachment band 51 of the first pipe transfer device 37 of the new pipe 8 before joining abuts on the open end surface of the receiving port 16 of the new pipe 7 that has been joined. As a result, the insertion port 15 of the new pipe 8 before joining is inserted into the receiving port 16 of the new pipe 7 that has been joined to a predetermined position.

In this way, the new pipe 8 before joining is joined to the new pipe 7 that has been joined, and then the sling belt 107, the joining traction device 48, and the inner reaction force plate 46 are removed and removed, as shown in FIG. , The receiving port 16 of the new pipe 8 to which the first worker 111 is joined is jacked up and lifted, the pedestal 121 is installed, and the receiving port 16 of the new pipe 8 is installed on the pedestal 121.

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

After that, as shown by the virtual line in FIG. 9, the spacing adjusting bolt 73 of the first ring device 41 is turned in the other direction to reduce the spacing 72 between the flanges 65 and 66, and the spacing adjusting bolt 81 is moved in the other direction. By turning to reduce the distance 80 between the flanges 63 and 64, the distance 72 and 80 between the ends of the first to fourth divided ring pieces 55 to 58 are reduced, and the distance 72 and 80 between the ends of the first to fourth divided ring pieces 55 are reduced. The pressing action of the lower horizontal pipeline portion 32 of ~ 58 on the inner peripheral surface is released, and the first ring device 41 can be separated from the inner peripheral surface of the lower horizontal pipeline portion 32. As a result, the first ring device 41 can be easily removed.

Further, the second ring device 42 can be easily removed in the same manner as the first ring device 41.

Further, as shown in FIGS. 6 and 10, the thickness T1 of the 4th division ring piece 58 located at the lower part of the ring main body 53 of the 1st and 2nd ring devices 41 and 42 is divided into the remaining 1st to 3rd divisions. Since the thickness of the ring pieces 55 to 57 is thinner than T2, when the first and second ring devices 41 and 42 are fixed in the existing pipe line 2, the inner circumference of the fourth divided ring piece 58 and the existing pipe are used. The level difference with the inner peripheral surface of the road 2 is reduced. As a result, when the new pipes 5 to 11 are carried into the existing pipeline 2, the mounting frame 54 is removed from the ring body 53 of the first ring device 41 or the second ring device 42 on the carry-in side, thereby carrying in the carry-in side. With the first ring device 41 or the second ring device 42 fixed in the existing pipeline 2, the new pipes 5 to 11 can easily pass through the inside of the ring body 53, and the new pipes 5 to 11 are already installed. It can be carried into the pipeline 2.

Further, by carrying the new pipes 5 to 11 into the existing pipe line 2 and then attaching the mounting frame 54 to the ring main body 53, the strength of the first ring device 41 and the second ring device 42 is maintained. The mounting positions of the first and second traction devices 43 and 44 can be changed.

In the above embodiment, as shown in FIG. 6, the ring main body 53 of the first and second ring devices 41 and 42 is divided into four parts of the first to fourth divided ring pieces 55 to 58, respectively. It is not limited to the division only, and may be divided into a plurality of divisions other than the four divisions.

In the above embodiment, as shown in FIG. 6, two left and right first traction devices 43 are attached to the attachment frame 54 of the first ring device 41, and a new pipe 8 is used by using two left and right first wires 39. The new pipe 8 may be towed by attaching one first traction device 43 to the attachment frame 54 of the first ring device 41 and using one first wire 39. Similarly, two left and right second traction devices 44 are attached to the attachment frame 54 of the second ring device 42, and two left and right second wires 40 are connected to the second pipe transfer device 38 of the new pipe 8. However, one second traction device 44 may be attached to the attachment frame 54 of the second ring device 42, and one second wire 40 may be connected to the second pipe transfer device 38 of the new pipe 8.

In the above embodiment, when the first and second ring devices 41 and 42 are fixed in the existing pipeline 2, the outer peripheral surface of the ring body 53 is in close contact with the inner peripheral surface of the existing pipeline 2 over the entire circumference. However, if there is a slight gap between the outer peripheral surface of the ring body 53 and the inner peripheral surface of the existing pipeline 2, the ring main body 53 is inclined in the pipe axis direction G to the inner circumference of the existing pipeline 2. The first and second ring devices 41 and 42 may be fixed in the existing pipeline 2 by hooking on the surface, respectively.

2 Existing pipelines 5 to 11 New pipes 41 1st ring device 42 2nd ring device 43 1st traction device 44 2nd traction device 53 Ring body 54 Mounting frame 55 to 58 Divided ring pieces 63 to 66 Flange 72,80 spacing 73,81 Spacing adjustment bolt (distance adjusting member)
78,79 Connecting members 88a, 88b Eyebolts (mounting part)
G pipe axis direction

Claims (7)

It is a ring device installed in the existing pipeline when laying a new pipe in the existing pipeline.
It has a ring body that is pressed against the inner peripheral surface of the existing pipeline and a mounting frame provided on the ring body.
The ring body is divided into a plurality of arc-shaped divided ring pieces in the circumferential direction.
The distance between the connecting member that connects the end of one split ring piece and the end of the other split ring piece that are adjacent to each other in the circumferential direction, and the end of one split ring piece and the end of the other split ring piece. Is equipped with an interval adjusting member that expands and contracts in the circumferential direction.
A ring device characterized in that a mounting frame is provided with a mounting portion to which a traction device for pulling a new pipe can be mounted in an existing pipeline. The ring device according to claim 1, wherein the mounting frame is detachable from the ring body and can be mounted across a plurality of divided ring pieces. The mounting frame protrudes from the ring body in the direction of the tube axis,
The ring device according to claim 1 or 2, wherein a traction device is arranged between the ring body and the mounting portion in the pipe axis direction. Each split ring piece has flanges at both ends in the circumferential direction
The connecting member has a connecting bolt and a connecting nut that connect the flange of one split ring piece and the flange of the other split ring piece that face each other in the circumferential direction.
The spacing adjustment member consists of spacing adjustment bolts.
The spacing adjusting bolt is characterized in that it is screwed into a screw hole formed in the flange of one dividing ring piece to penetrate the flange in the circumferential direction, and its tip portion abuts on the flange of the other dividing ring piece. The ring device according to any one of claims 1 to 3. The invention according to any one of claims 1 to 4, wherein the thickness of the split ring piece located at the lower part of the ring body in the radial direction is thinner than the thickness of the other split ring pieces in the radial direction. Ring device. The method for transferring a pipe using the ring device according to any one of claims 1 to 5.
Fix the ring body of the ring device to the inner peripheral surface of the existing pipeline,
Attach the traction device to the mounting part of the ring device,
A pipe transfer method characterized in that a new pipe is towed by a towing device. The method for transferring a pipe according to claim 6, wherein the traction device is arranged at a position opposite to the newly installed pipe to be towed with respect to the ring body of the ring device.

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