JP2008232428A - Pipe inner face repairing joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe inner face repairing joint enabling one operator to temporarily assemble an expansion band, and capable of conducting expansion assembly of the expansion band in a short period of time easily as compared with a conventional one. <P>SOLUTION: The expansion band 13 comprises a plurality of circular segments 16, 17, 18, a hinge connection device 19 for connecting the circular segments, a ratchet connection device 20 for connecting the circular segments positioned on end sides, a spacer 37 arranged in a space L formed between the circular segments, and a connection means 35 for connecting the circular segments through the spacer 37. The hinge connection device 19 includes a fitting plate 22, and a fitting plate receiving part 24. The ratchet connection device 20 includes a ratchet plate 26 having a locking claw 25 on a tip end part, and a ratchet plate 28 having a plurality of locking claw receiving openings 27. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pipe inner surface repair joint for repairing leakage of liquid generated in a pipe joint portion of a pipe line from the inner surface of the pipe line.

  In general, pipes used for agricultural water, industrial water, waterworks, etc. are arranged in grooves dug in the ground made of PC pipes or steel pipes, and the pipes are connected by joints, and the grooves are soiled. It is buried in the ground by filling in.

  The pipe buried in the ground may leak in the pipe joint part due to long-term use. When a leak occurs in the pipe joint part of the pipe, it is necessary to repair the leak of the pipe joint part of the pipe and stop the leak of the pipe joint part.

In a conventional pipe joint leak repairing device, a portion of the buried pipe line corresponding to the leaked pipe joint is dug, and the outer periphery of the leaked pipe joint is exposed. There is known a leakage repair device for repairing leakage of a pipe joint portion by fixing a repair material to the pipe joint portion leaked from the outer surface of the road.
However, this type of leakage repair apparatus has a problem that the number of repair steps increases and it cannot be used when there are buildings or structures on the ground.

  In addition, in a conventional leak repair device for a pipe joint part, if the pipe body embedded in the ground has a diameter large enough to allow the operator to enter the pipe, the worker enters the pipe body. The rubber ring is placed on the inner surface of the leaking part of the tube joint, the expansion band with a fastening seat is placed on the inner surface of the rubber ring, the fastening seat of the expansion band is fixed with bolts, and the rubber ring is piped There is known a leakage repair device for repairing leakage of a pipe joint portion by tightly fixing to the inner surface of the body.

  Although the leak repair device for the pipe joint part can be repaired without digging up the leak part of the pipe line, the fastening seat of the expansion band and the bolt protrude from the inner surface of the pipe. There is a problem that the flow of fluid in the channel is obstructed.

  Therefore, the rubber ring is arranged on the inner surface of the leaking part of the pipe joint, the expansion band is arranged on the rubber ring, and the rubber ring is attached to the inner surface of the pipe body without using tightening seats and bolts. A pipe inner surface repair joint has been developed that is fixed under tight pressure (Patent Document 1).

  As shown in FIG. 10, the pipe inner surface repair joint includes a rubber ring 2 disposed so as to bridge the pipes 1, 1 on the inner surfaces of the ends 1 a, 1 a of the pipes 1, 1 to be connected, It is composed of a pair of expansion bands 3 and 3 disposed on the inner surface of the rubber ring 2.

  As shown in FIGS. 10 and 11, the expansion band 3 includes two semicircular segments 3a and 3b and a mating semicircular segment 3b formed at the end 4 of each semicircular segment 3a and 3b. 3a, and a spacer 6 disposed between the end portions 4 and 4 of the semicircular segments 3a and 3b. At the end of each semicircular segment 3a, 3b, an opening 8 is formed in which the cylinder 7a and the piston 7b of the operating cylinder 7 shown in FIG. 12 are engaged.

  In the temporary assembly stage of the expansion band 3, the pipe inner surface repair joint is configured so that the locking claw portion 5 formed on the end portion 4 of the semicircular segment 3a is connected to the end of the semicircular segment 3b as shown in FIG. The locking claw portion 5 formed at the end 4 of the semicircular segment 3b is loosely locked to the end 4 of the semicircular arc segment 3a. And a spacer 6 is disposed between the end portions 4 of the semicircular segment 3b.

In the assembly stage of the expansion band 3, the pipe inner surface repair joint has the cylinder 7b of the operating cylinder 7 engaged with the opening 8 provided in the semicircular segment 3a, as shown in FIG. 12, and is attached to the semicircular segment 3b. The cylinder 7a of the operation cylinder 7 is engaged with the provided opening 8, the temporarily expanded expansion band 3 is expanded by the operation cylinder 7, and the end portions 4 of the semicircular segments 3a and 3b of the expanded expansion band 3 are expanded. The spacer 6 is placed between the rubber rings 2 to be fastened and fixed.
JP-A-2-295478

  The pipe inner surface repair joint has a structure in which all the joints of the multiple segments constituting the expansion band are simply brought into contact with each other via a spacer, so the segments are fixed during temporary assembly of the expansion band. Because it is not possible to do so, the joint part of the segment may be laterally shifted or detached, and the temporary assembly of the expansion band cannot be performed by one worker, and the expansion band is configured when the expansion band is assembled. Since all joint portions of a plurality of segments must be expanded, there is a problem that assembling an expansion band requires a lot of labor and time.

  The object of the present invention is to prevent the lateral displacement and separation of the joint portion of the segment, so that the temporary assembly of the expansion band can be performed by one worker, and the expansion band can be assembled in a shorter time and more easily than the conventional one. It is to provide a pipe inner surface repair joint that can be performed.

  The pipe inner surface repair joint according to the present invention includes a rubber ring disposed on the inner surface of the end of the pipe to be connected so as to bridge the pipes, and a rubber ring on the inner surface of the rubber ring. The expansion band is connected to the plurality of arc-shaped segments, the hinge coupling device for coupling adjacent arc-shaped segments, and the arc-shaped segments located on the end side. The spacer arranged in the space formed between the ratchet coupling device, the arc-shaped segment located on the end side during assembly where the ratchet coupling device is engaged and disengaged, and the arc-shaped segments located on the end side via the spacer The hinge coupling device is disposed on the end of one arcuate segment so as to extend in the circumferential direction and on the inner surface of the end of the other arcuate segment. The ratchet coupling device has a locking claw at the tip and is disposed on the inner surface of the end of one arcuate segment. The ratchet plate includes a ratchet plate and a ratchet plate that has a plurality of locking claw receiving openings at intervals in the longitudinal direction and is arranged on the inner surface of the end of the other arcuate segment.

  In the pipe inner surface repair joint of the present invention, temporary assembly before expansion of the expansion band is performed by connecting the arc segments to each other by a hinge connecting device and connecting the arc segments located on the end side by using a ratchet connecting device. Thus, the arc-shaped segments are not laterally displaced from each other during the temporary assembly of the expansion band, and the temporary assembly of the expansion band can be performed by a single worker. Since there is only one part, the expansion band can be assembled in a short time and easily compared to the conventional pipe inner surface repair joint.

  Moreover, the pipe inner surface repair joint of the present invention connects the arcuate segments located on the end side with a connecting means via a spacer when assembling the expansion band that is engaged and disengaged by the ratchet coupling device. As a result, the external pressure strength can be increased as compared with the conventional pipe inner surface repair joint.

Hereinafter, an embodiment of a pipe inner surface repair joint according to the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 1, the pipe inner surface repair joint 10 according to the present invention bridges the pipe bodies 11, 11 on the inner surface of the end portion including the joint portions 11 a of the pipe bodies 11, 11 which are precast concrete pipes (PC pipes). The rubber ring 12 is arranged in this manner, and the two expansion bands 13 and 13 are arranged on the inner surface of the rubber ring 12 so that the rubber ring 12 is pressed against the inner surfaces of the end portions of the tubular bodies 11 and 11. .

  As shown in FIG. 1, the rubber ring 12 includes two extension band support portions 14, 14 formed in the inner surfaces of both end portions and extending in the circumferential direction, and a connection portion 15 that connects the extension band support portions 14, 14. Have The connecting portion 15 is formed by a flexible portion that protrudes radially inward from the inner surface of the rubber ring 12.

  As shown in FIG. 2, the expansion band 13 includes arc segments 16, 17, and 18 obtained by dividing a circle into three parts, a hinge coupling device 19 that couples the ends of the arc segment 16 and the arc segment 17, and Consists of a hinge connecting device 19 for connecting the ends of the arc-shaped segment 17 and the arc-shaped segment 18, and a ratchet connecting device 20 for connecting the ends of the arc-shaped segment 16 and the arc-shaped segment 18 located on the end side. Is done.

  As shown in FIGS. 3 and 6, the hinge connecting device 19 includes a fitting plate 22 having a fitting portion 21 at the tip portion and a fitting plate receiving portion 24 having an opening 23 extending in the longitudinal direction on the upper surface. The

  The fitting plate 22 is an arcuate plate having the same center as the arcuate segments 16, 17 and 18. The width of the fitting portion 21 provided on the fitting plate 22 is preferably wider than the width of the fitting plate 22. The fitting plate 22 is disposed at the end of the arc segment 17 facing the arc segment 16 and the end of the arc segment 18 facing the arc segment 17. The fitting plate 22 is attached to the inner surfaces of the end portions of the arc-shaped segment 17 and the arc-shaped segment 18 by welding means so as to extend in the circumferential direction from the end surfaces.

  As shown in FIG. 3, the fitting plate receiving portion 24 is formed from a molded plate having a U-shaped cross section. An opening 23 extending in the longitudinal direction is formed on the upper surface of the fitting plate receiving portion 24. The opening 23 formed in the fitting plate receiving portion 24 includes a wide opening portion 23a through which the fitting portion 21 of the fitting plate 22 passes, and a narrow opening portion that rotatably supports the fitting portion 21 of the fitting plate 22. 23b. The fitting plate receiving portion 24 is attached to the inner surfaces of the end portions of the arc-shaped segments 16 and 17 by welding means so as to form a fitting plate accommodating space 24a between the inner surfaces of the arc-shaped segments.

  As shown in FIG. 4, the ratchet coupling device 20 includes a ratchet plate 26 having a locking claw 25 at the tip and a plurality of receiving openings 27, 27, 27, 27 spaced in the longitudinal direction. 28. The ratchet plate 26 is disposed on the inner surface of the end of the arc segment 18. The ratchet plate 28 is disposed on the inner surface of the end of the arc segment 16.

  Further, at the end of the arcuate segment 18 opposite to the side on which the fitting plate 22 is provided, a groove 29 through which a locking claw 25 provided on the ratchet plate 26 is inserted and a receiving groove 30 for receiving an extension jig (not shown), 30 is formed. On the inner surface of the end of the arcuate segment 16 opposite to the side on which the fitting plate receiving portion 24 is provided, there is a locking portion 31 adjacent to the ratchet plate 28, for example, where a piston cylinder type expansion jig is locked. Projected.

  The ratchet plate 26 is attached to the inner surface of the end of the arcuate segment 18 by spot welding so that the locking claw 25 provided at the distal end is inserted into the groove 29 provided in the arcuate segment 18. The ratchet plate 28 is attached to the inner surface of the end of the arc-shaped segment 16 by spot welding means. The arc-shaped segment 16 and the arc-shaped segment 18 are obtained by locking the locking claw 25 of the ratchet plate 26 provided on the arc-shaped segment 18 to the selected receiving opening 27 of the ratchet plate 28 provided on the arc-shaped segment 16. Connected.

  Further, as shown in FIGS. 5 and 7, the arc-shaped segment 18 has two screw holes 32, 32 spaced apart in the longitudinal direction at a portion overlapping the ratchet plate 26. Similarly, the arcuate segment 16 also has two screw holes 32, 32 spaced in the longitudinal direction at a portion overlapping the ratchet plate 28. The connecting plate 35 is disposed so as to bridge the arc segment 16 and the arc segment 18.

  The connecting plate 35 is an arc-shaped plate substantially equal to the arc-shaped segments 16, 18 and has four long holes 34, 34, 34, 34 spaced in the longitudinal direction as shown in FIG. 7. The connecting plate 35 has two long holes 34, 34 provided on one end side aligned with two screw holes 32, 32 provided on the arc segment 16, and two long holes 34, 34 provided on the other end side. It arrange | positions so that it may align with the two screw holes 32 and 32 provided in the circular arc segment 18. FIG.

  The connecting plate 35 is arranged so as to bridge the arc segment 16 and the arc segment 18 of the expansion band 13 which has changed from the temporary assembly position shown in FIG. 2A to the extended assembly position shown in FIG. 2B. Is done. The connecting plate 35 is screwed into screw holes 32, 32 provided in the arc-shaped segment 16 through elongated holes 34, 34 having fixing screws 36, 36 formed on one end side, and fixing screws 36, 36 are formed on the other end side. The arc-shaped segment 16 and the arc-shaped segment 18 are connected by screwing into the screw holes 32, 32 provided in the arc-shaped segment 18 through the elongated holes 34, 34.

Next, a procedure for assembling the pipe inner surface repair joint according to the present invention will be described.
First, when it is confirmed that liquid leakage has occurred in the pipe joint 11a of the pipe buried in the ground, the pipe is shut off in order to stop the liquid leakage of the joint 11a, and work is performed in the shut-off pipe. Person enters. And the rubber ring 12 is arrange | positioned in the pipe body 11 and 11 end-part inner surface so that the pipe bodies 11 and 11 containing the leaked joint part 11a may be bridged.

  Next, the arc segments 16, 17, and 18 divided into three parts constituting the expansion band 13 are temporarily assembled into the form shown in FIG. As shown in FIG. 3, the extension band 13 is temporarily assembled by connecting the arc segment 16 and the arc segment 17 by a hinge connecting device 19 and connecting the arc segment 17 and the arc segment 18 by a hinge connecting device 19. As shown in FIG. 4, the arcuate segment 16 and the arcuate segment 18 located on the end side are connected by a ratchet connecting device 20.

  As shown in FIG. 6A, the hinge connection between the arcuate segment 16 and the arcuate segment 17 is performed by placing the fitting plate 22 provided on the arcuate segment 17 directly above the fitting plate receiving portion 24 provided on the arcuate segment 16. After placing the fitting portion 21 of the fitting plate 22 into the wide opening 23 of the fitting plate receiving portion 24, the fitting plate 22 provided on the arc-shaped segment 17 is moved to an arrow as shown in FIG. The fitting portion 22 is mounted in the accommodating space 24 a provided in the fitting plate receiving portion 24 until the fitting portion 21 of the fitting portion 22 contacts the inner surface of the wall portion of the fitting plate receiving portion 24. This is performed by bringing the end face of the arc-shaped segment 16 into contact with the end face of the arc-shaped segment 17.

  Similarly, the arc-shaped segment 17 and the arc-shaped segment 18 which are hinge-connected to the arc-shaped segment 16 are connected to the hinge-shaped segment 18 directly above the fitting-plate receiving portion 24 provided to the arc-shaped segment 17. After the fitting portion 21 of the fitting plate 22 is inserted into the wide opening 23 of the fitting plate receiving portion 24, the fitting space provided in the fitting plate receiving portion 24 is provided with the fitting plate 22 provided on the arcuate segment 18. This is performed by attaching the end surface of the arc-shaped segment 17 and the end surface of the arc-shaped segment 18.

  The arc segment 16 and the arc segment 17 and the arc segment 17 and the arc segment 18 are connected to each other by attaching the fitting plate 22 provided on one arc segment to the fitting plate receiving portion 24 provided on the other arc segment. Since one arc segment is rotated in the radial direction with respect to the other arc segment, the longitudinal movement of one arc segment with respect to the other arc segment is It is limited by the fitting plate 22 provided in the segment and the fitting plate receiving portion 24 provided in the other arcuate segment, so that one arcuate segment does not shift laterally with respect to the other arcuate segment. The rotation of one arc segment with respect to the other arc segment means that the end surface of one arc segment is Limited by contact with the end face of the segment, thus, one of the arcuate segments and the other arcuate segment is regulated so as to be positioned on the same circle.

  As shown in FIG. 4, the ratchet connection between the arc-shaped segment 16 and the arc-shaped segment 18 is performed by overlapping the arc-shaped segment 16 and the arc-shaped segment 18 so that the arc-shaped segment 18 is positioned on the inner side. The latching claw 25 of the ratchet plate 26 provided in the segment 18 is engaged with any one of the plurality of receiving openings 27, 27, 27 of the ratchet plate 28 provided in the arcuate segment 16.

  The arc-shaped segment 16 and the arc-shaped segment 18 are connected by locking the locking claw 25 of the ratchet plate 26 provided on the arc-shaped segment 18 to the receiving opening 27 of the ratchet plate 28 provided on the arc-shaped segment 16. Therefore, by adjusting the overlapping length of the end portions of the arc-shaped segments, it is possible to cope with the pipe diameter of the pipe constituting the pipe line.

As described above, the temporary assembly of the extension band 13 is performed by connecting the arc segment 16 and the arc segment 17 with a hinge, connecting the arc segment 17 and the arc segment 18 with a hinge, and connecting the arc segment 16 and the arc segment 18 together. This is done by ratcheting.
As shown in FIGS. 6A and 6B, the hinge connection between the arc-shaped segment 16 and the arc-shaped segment 17 and the hinge connection between the arc-shaped segment 17 and the arc-shaped segment 18 are performed as shown in FIGS. After being inserted into the wide opening 23 of the fitting plate receiving portion 24, the fitting plate 22 provided in the arc-shaped segment 18 is mounted in the accommodating space 24a provided in the fitting plate receiving portion 24, and the end surface of the arc-shaped segment 17 and the circle Since it is performed by contacting the end surface of the arc-shaped segment 18, the arc-shaped segments are not laterally displaced from each other during temporary assembly of the expansion band 13, and can be easily performed by one worker.

  Further, the arc-shaped segment 17 and the arc-shaped segment 18 are hingedly connected to the temporary assembly of the extension band 13, so that it is not necessary to use dedicated parts such as hinge pins for the arc-shaped segments. 16 and the arcuate segment 18 can be ratchet connected to adjust the overlap length of the ends of the arcuate segment, and the outer diameter of the temporarily assembled expansion band 13 can be adjusted to the pipe diameter of the pipe constituting the pipe. It can handle errors.

  Next, the temporarily assembled expansion bands 13 and 13 are disposed on the expansion band support portions 14 and 14 provided on the inner surface of the rubber ring 12. Then, the diameter of the temporarily assembled extension band 13 is expanded from the temporary assembly position shown in FIG. 2A to the extended assembly position shown in FIG. The expansion operation of the expansion band 13 is performed by hooking piston cylinder type expansion jigs to the receiving grooves 30 and 30 provided in the arc-shaped segment 18 and the engaging portions 31 provided in the arc-shaped segment 16 respectively. This is done by operating in the opening direction.

  When the diameter of the extension band 13 is increased from the temporary assembly position shown in FIG. 2A to the extension assembly position shown in FIG. 2B, the ratchet plate 26 of the ratchet coupling device 20 that connects the arc segment 16 and the arc segment 18 is connected. The ratchet plate 28 is engaged and disengaged, and a gap L is formed between the end surface of the arc segment 16 and the end surface of the arc segment 18 as shown in FIG. The gap L formed in the expansion band 13 corresponds to the expansion amount of the expansion band 13 for pressing the rubber ring 12 against the inner surfaces of the end portions of the tubular bodies 11 and 11.

  When the diameter of the expansion band 13 is increased by a preset expansion amount, as shown in FIG. 7, a spacer 37 is provided in the gap L formed between the end surface of the arc-shaped segment 16 and the end surface of the arc-shaped segment 18 of the expansion band 13. Wear. Thereby, a preset extension amount of the extension band 13 is secured.

  Next, the arcuate segment 16 and the arcuate segment 18 of the expansion band 13 whose diameter is expanded from the connecting plate 35 are arranged so as to bridge each other, and the fixing holes 35, 35 are formed on one end side of the connecting plate 35. , 34 are screwed into screw holes 32, 32 provided in the arc-shaped segment 16, and fixing screws 35, 35 are provided in the arc-shaped segment 18 through long holes 34, 34 formed on the other end side of the connecting plate 35. Screw into the holes 32. As a result, the arc segment 16 and the arc segment 18 of the expansion band 13 are connected by the connecting plate 35 via the spacer 37.

  In this way, the rubber ring 12 disposed so as to bridge the tubular bodies 11 and 11 including the joint portions 11a in which the expanded expansion bands 13 and 13 have leaked is pressed against the inner surfaces of the end portions of the tubular bodies 11 and 11. The liquid leakage is repaired from the leaked joint portion 11a.

  In the above-described embodiment, the extension band 13 is constituted by the arc segments 16, 17, 18 divided into three parts. However, the extension band 13 is constituted by the arc segment 9l divided into two or four parts. Of course you can.

  In the pipe inner surface repair joint 10 according to the present invention, there is no lateral shift between the arc segments when the expansion band 13 is temporarily assembled, and there is one joint portion between the arc segments. Can be done by workers.

  Further, the pipe inner surface repair joint 10 according to the present invention connects the arc-shaped segments located on the end side of the expansion band 13 with the connecting plate 35 via the spacer 37 when the expansion band 13 is assembled. The rigidity is strengthened, and the external pressure resistance can be increased as compared with the conventional pipe inner surface repair joint.

  FIG. 8 shows another embodiment of the hinge coupling device 19 according to the present invention, and a tip-shaped recess 40 is formed at the distal end of the fitting plate 22 whose base end is welded to the end of the segment 17 located at one end. The fitting plate 22 is prevented from coming off by its head portion 41a by fitting the concave portion 40 into the screw shaft portion of an in-bending prevention set screw 41 screwed into the end portion of the segment 16 located at the other end. It has come to be.

  A long hole 42 that is long in the longitudinal direction of the fitting plate 22 is formed in the base end portion of the fitting plate 22, and the segments 16 and 17 are prevented from being bent in the transverse direction in the long hole 42. A collar 43 is fitted, and a stop screw 44 penetrating the collar 43 is screwed into the segment 16 and fixed.

  Therefore, at the time of assembly, the assembly can be completed simply by fitting the recess 40 of the fitting plate 22 fixed to the segment 17 at one end to the locking screw 41 for preventing internal bending of the segment 16 at the other end.

  According to this embodiment, the troublesome operation of fitting the fitting portion 21 at the distal end of the fitting plate 22 into the fitting portion receiving portion 24 as in the above-described embodiment can be eliminated, and workability in the field is improved. Can be greatly improved.

  FIG. 9 shows a configuration in which a band extension piece 45 for adjusting the peripheral length of the expansion band 13 can be added by using the long hole 42, and a stop screw 44 inserted through the long hole 42 is attached to the band extension piece 45. By screwing, the segment 17 is extended by the width of the band extension piece 45, the extension band 13 is expanded by that amount, and the other screw 46 is screwed into the segment 16, so that both the segments 16, 17 are connected. It has come to be.

  Since other configurations are the same as those in FIG. 8, the same reference numerals are given to corresponding portions.

  According to this embodiment, by selecting the width of the band extension piece 45, it is possible to easily cope with a pipe having a large variation, and it is possible to easily perform the adjustment on site.

It is a perspective view which breaks and shows a part of internal repair joint by this invention. It is a figure which shows the assembly position and the temporary assembly position of the expansion band of the internal surface repair joint by this invention. It is a figure which shows the hinge connection apparatus of the expansion band of the internal surface repair joint by this invention. It is a top view which shows the ratchet coupling apparatus of the expansion band of the internal surface repair joint by this invention. It is a figure which shows the assembly state of the joint part of the expansion band of the internal surface repair joint by this invention. . It is a figure which shows the connection method by the hinge connection apparatus of the expansion band of the internal surface repair joint by this invention. FIG. 3 is an exploded perspective view of an extension band ratchet coupling device of an inner surface repair joint according to the present invention. It is a perspective view which shows other embodiment of the hinge coupling device in this invention. It is a perspective view which shows other embodiment same as the above. It is sectional drawing which shows the conventional inner surface repair joint. It is a figure which shows the connection part of the expansion band of the conventional internal surface repair joint. It is a figure which shows the operation cylinder which expands the expansion band of the conventional internal surface repair joint.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pipe inner surface repair joint 11 Tube 11a Joint part 12 Rubber ring 13 Expansion band 16, 17, 18 Arc-shaped segment 19 Hinge coupling device 20 Ratchet coupling device 22 Fitting plate 24 Fitting plate receiving part 26 Ratchet plate 3 Ratchet plate 35 Connecting plate 37 Spacer

Claims (5)

A rubber ring arranged so as to bridge the pipes on the inner surface of the end of the pipe to be connected, and an expansion band arranged so as to press the rubber ring on the inner surface of the rubber ring against the inner surface of the end of the pipe In a pipe inner surface repair joint having
The expansion band includes a plurality of arc segments, a hinge coupling device that couples adjacent arc segments, a ratchet coupling device that couples arc segments located on the end side, and a ratchet coupling device. At the time of assembly, it has a spacer arranged in a space formed between the arc-shaped segments located on the end side, and a connecting means for connecting the arc-shaped segments located on the end side via the spacer,
The hinge coupling device is disposed on the end portion of one arcuate segment so as to extend in the circumferential direction, and is disposed on the inner surface of the end portion of the other arcuate segment and rotatably supports the fitting plate. A mating plate receiving portion,
The ratchet coupling device has a latching claw at the tip and a ratchet plate disposed on the inner surface of the end of one arcuate segment, and a plurality of latching claw receiving openings at intervals in the longitudinal direction. And a ratchet plate disposed on the inner surface of the end of the arc segment of the pipe inner surface repair joint.   The connecting means includes a connecting plate having an elongated opening, a fixing screw fixed to one arcuate segment through the elongated opening, and a fixing screw fixed to the other arcuate segment through the elongated opening. The pipe inner surface repair joint according to claim 1.   One arc segment located on the end side has an extension jig receiving part on both sides of the end part, and the other arc segment located on the end side has an extension jig locking part on the inner surface of the end part. The pipe inner surface repair joint according to claim 1.   In the hinge coupling device, a tip-shaped concave portion is formed at the tip of a fitting plate arranged to extend in the circumferential direction at the end of the arc-shaped segment located at one end, and the arc-shaped segment located at the other end is threaded. The pipe inner surface repair joint according to claim 1, wherein both the segments are connected by fitting the recessed portion to the inserted set screw.   A long hole extending in the longitudinal direction is formed at the base end of the fitting plate, and a band extension piece interposed between the end portions of both segments is fixed by a stop screw inserted into the long hole. 4. The pipe inner surface repair joint according to 4.

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