JPS62155709A - Apparatus for repairing underground conduit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field]

In the repair of underground pipes, such as those laid underground to bring in telecommunication cables, the present invention applies a repair sleeve to the damaged part of the underground pipe that is broken or has a hole, by expanding the diameter of the repair sleeve from inside the pipe. The present invention relates to a repair device for repairing parts by attaching the parts to each other.

[Problems to be solved by the invention]

For example, the underground conduit that carries the telecommunications cables mentioned above,
It is usually made up of multiple 7-15 mm diameter casings arranged in rows underground, such as under a road, and when the initial installation is carried out, it is necessary to remove any excess that is expected to be installed in the future. Empty conduits are laid at the same time, and the cables to be routed are then drawn into any of the empty conduits. Over time after installation, underground pipes such as this can bend or break due to changes in the ground or the load of vehicles passing on the road, resulting in uneven levels, which can lead to defective empty pipes. There is an inconvenience that it becomes a road and hinders the installation of new cables. To repair such defective pipes, conventional repair methods have been carried out, such as straightening a broken pipe in an uneven state by passing a pipe straightening device inside the underground pipe, or expanding the diameter of a dented part. However, if the pipe is broken or has a hole, it may not be possible to close the break or hole by straightening the pipe as described above, and the damaged part may not be completely repaired. Ta. Therefore, as a repair method, the present applicant has developed a hydraulic cylinder with a piston inside, and a piston that is connected to the piston and protrudes from one end of the hydraulic cylinder. A split sleeve whose diameter can be expanded is connected to the end face of the hydraulic cylinder on the side from which the piston rod protrudes, and a repair sleeve is fitted and held on the outer periphery of the split sleeve, and an expansion sleeve is press-fitted into the separate sleeve. A sleeve expander consisting of a diameter head attached to the piston rod is inserted, and the sleeve expander is operated at the location where damage occurs in the circumferential direction, thereby press-fitting the expanded diameter head into the split sleeve. We have separately proposed a repair method in which the diameter of the outer circumferential compensating sleeve is expanded via a split sleeve, and the sleeve is attached to the inner surface of the damaged pipe. The problem here is that in order to expand the diameter of the repair sleeve, which is press-fitted into a split sleeve with a slit and fitted around the outer periphery of the expansion head to the required inner diameter of the pipe, it is necessary to In a configuration where the expanding diameter head is first pushed into the split sleeve by the extension action of the piston rod, the piston rod does not have enough strength to buckle against the pressing force. For this reason, the piston rod had to be made thick and large in diameter, and the sleeve expander itself was also large, and there were restrictions on the inner diameter of the underground pipe through which it was inserted, making supplementary cleaning difficult. Only relatively thick underground pipelines could be repaired. [Objective of the Invention] The present invention was proposed to solve the above-mentioned problems.
When repairing underground pipes, a repair sleeve is attached to the damaged part of the pipe by expanding and contracting the piston rod.
When press-fitting and moving the diameter-expanding head into the split sleeve to expand the pipe to the required inner diameter, first, the piston rod is shaped so that it does not buckle, and the required pressing force in the diameter-expansion direction is applied. The object of the present invention is to provide an underground conduit repair device that has a thin piston rod and a compact sleeve expander. Structure of the Invention In order to achieve this object, the present invention provides that in the sleeve expander described above, the enlarged diameter head press-fitted into the split sleeve is moved to the open end side of the split sleeve when the piston rod is retracted. The sleeve is press-fitted so as to be drawn closer to the hydraulic cylinder to expand the diameter of the training sleeve or repair sleeve. [Embodiment 1] An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a state in which the sleeve dilator B of the present invention is introduced into a broken underground pipe A. The sleeve expander B described above is constructed as follows based on a hydraulic cylinder 1 having a piston 2 therein. That is, the hydraulic cylinder 1 has a piston rod 21 protruding from one end that is connected to the piston 2, and an iron ball-shaped enlarged diameter head 3 is attached to the protruding end of the piston rod 21 with a tightening bolt 31. Fastened and fixed. A retraction lobe 4 is connected to the front end of the enlarged diameter head 3, and by pulling the retraction lobe 4, the sleeve dilator B can be moved along the inside of the canal. Further, the hydraulic cylinder 1 has a hydraulic hose 12. W move 13. Hydraulic oil is supplied into the oil chamber 1a on one side of the piston 2 through the oil passages 14, 15, so that the piston rod 21 is retracted, and the hydraulic oil is supplied to the hydraulic port 16. The piston rod 21 is configured to extend by being supplied to the other oil chamber 1b through the joint 17. A split sleeve 5 whose diameter can be expanded is connected to the end face 1C of the hydraulic cylinder 1 on the side from which the piston rod 21 protrudes via a detachable bolt 11. This split sleeve 5
is a slit 5 extending in the direction as shown in FIG.
A plurality of slits 1 (six in the figure) are provided in parallel at predetermined equal pitches in the circumferential direction, and these slits 5
1 is opened at the distal end side of the split sleeve 5, and the distal end side is in a split form, and the enlarged diameter head 3 of 11η is press-fitted from the open distal end side, making it easy to expand outward. In this way, the split sleeve 5 has an enlarged diameter part 5a on the open end side and an extension part 5b on the inner side, so that the enlarged diameter head 3 moves inside the enlarged diameter part 5a by the contraction movement of the piston rod 21. It is possible to press fit the extension part 5b through the extension part 5b. A short tubular repair sleeve 6 is fitted and held on the outer periphery of the split sleeve 5, located outside the enlarged diameter portion 5a. This is expanded outward by the split sleeve 5 and the underground pipe A
As shown in FIG. 3, the repair sleeve 6 is cylindrical with equal thickness and has a wall thickness that allows for easy diameter expansion. The inner end of the repair sleeve 6 is locked to a step 52 protruding from the outer circumferential surface of the split sleeve 5 so that the holding position does not shift inward (in the press-fitting direction of the expanded diameter head 3). Although this repair sleeve 6 is made of a steel pipe, it may be made of a material whose diameter can be easily expanded. a3 A coiled ring 1 as shown in FIG. 4 is installed inside the separate sleeve 5, and a slit ring 8 as shown in FIG. 5 is installed inside the coiled ring 1 as shown in FIG. Ru. Both the coiled ring 7 and the slitted ring 8 are inserted when the diameter-expanding head 3 is press-fitted.
This is introduced to ensure the required diameter expansion dimension. In other words, the split sleeve 5 cannot be made thicker than necessary because if it becomes thicker than necessary, the diameter expansion operation will be inhibited, so the coiled ring 7 and the slitted ring 8 are separated into separate sleeves. These coiled rings 7 and slitted rings 8 are introduced into the inner peripheral side of the split sleeve 5 by devising the form of the split sleeve 5 to have a wall thickness that ensures the required expanded diameter dimension. However, the coiled ring 1 and the slitted ring 8 may be omitted if the diameter can be easily expanded. In the present invention, especially the piston rod 2
1 penetrates the inside of the split sleeve 5 and extends to the open end side thereof, and the enlarged diameter head 3 attached to the protruding end of the piston rod 21 opens the end of the υ1 sleeve 5 when the piston rod 21 is retracted. The slit ring 8 is press-fitted into the slit ring 8 so as to be pulled in from the side, and the enlarged diameter head 3 is moved toward the hydraulic cylinder 1 as the piston rod 21 contracts. Next, an example of use and operation of the sleeve dilator B configured as described above will be explained. First, use a pipe camera, for example, to locate the underground pipe A from the manhole that is the opening to the underground pipe that requires replenishment.
Insert the tube into the tube and observe the damaged state, and if the observation results show that the tube has an uneven condition due to breakage, the uneven condition is corrected by inserting a known tube straightening device into the pipe in advance. In the modified model, the sleeve dilator B of the present invention is introduced into the underground pipe A from one manhole side, and the sleeve dilator B is guided into the pipe by pulling the pulling row 14 from the other manhole side. And move it! Movement is stopped at location Aa where one scratch has occurred. During this stop, the repair sleeve 6 is positioned so as to bridge the cut at the damaged location Aa based on the results observed in advance. Next, in this state, hydraulic oil is supplied to the hydraulic hose 12 using a hydraulic pump or the like. Joint 13. Oil line 14. /15 into the oil chamber 1a of the hydraulic cylinder 1. As a result, the piston 2 moves to the right with respect to the hydraulic cylinder 1, and due to the contraction of the piston rod 21, the enlarged diameter head 3 moves into the split sleeve 5. The ring 8 is press-fitted into the slit ring 8 so as to be pulled in from the open end side. As a result, a pressing force is generated on the tapered surface 3a of the diameter-expanding head 3 so that the separate sleeve 5 with a slit and the repair sleeve 6 fitted therein are pushed outward, and the pressing force is It is evenly distributed in the circumferential direction via the shaped spring 7 and the split sleeve 5, and the repair sleeve 6 is plastically deformed outward so as to gradually expand in diameter from one end and attached to the inner peripheral surface of the conduit Δ. At this time, the expanded diameter head 3 is press-fitted into the slitted ring 8 so as to be pulled in from the tip distance M [111] of the split sleeve 5 due to the contraction action of the piston rod 21, and is pulled toward the hydraulic cylinder 1 side. Since the piston rod 21 advances in such a manner that buckling does not occur in the piston rod 21, even if the piston rod 21 is relatively thin and has a small diameter, a sufficient pressing force can be exerted in the diametrically expanding direction. As the diameter expanding head 3 is press-fitted, the diameter of the repair sleeve 6 is expanded at its top peripheral surface 3b so that the inner surface of the repair sleeve 6 is flush with the inner surface of the pipe A, and the diameter of the pipe A itself is also expanded. , when the expanded diameter head 3 advances to the inside of the extension part 51) of the split sleeve 5, the repair sleeve 6 does not protrude into the inner surface of the underground conduit A and the If11
A repair sleeve 6 is attached to the inner surface of the tube so as to close the cut at point Δa. Note that the repair sleeve 6 is plastically deformed and expanded in diameter, so it remains attached to the inner surface of the tube.On the other hand, the split sleeve 5. The coiled ring 7d5 and the slint toy 1 ring 8 have some residual elastic strain (springback) in themselves, so the enlarged diameter head 3
After the passage, the diameter of these particles is sequentially reduced and separated from the repair sleeve 6. Once the repair sleeve G has been attached to the above-mentioned damaged area Δa, pressure oil is introduced into the other oil chamber 1b of the hydraulic cylinder 1 via the hydraulic boss 1G and the joint 17, so that the piston 2 moves to the left. , and the piston rod 21 is extended, so that the enlarged diameter head 3 is pushed out from the extension portion 5b side of the split sleeve 5 toward the open end side, contrary to the press-fitting direction. During this escape, the repair sleeve 6 whose diameter has been expanded due to plastic deformation as described above,
Separate sleeve 5. Coiled ring 7, slit ring 8
is reduced in diameter due to the elastic strain that partially remains in itself, and is completely peeled off from the repair sleeve 6 as shown in FIG. After that, either the traction lobe 4 is wound up and the sleeve expander B is pulled forward, or the hydraulic hose 12 is pulled to pull out the sleeve expander B backward, and then the attachment/detachment bolt 11
Then, the used split sleeve 5 is removed, a new cutting sleeve 5 is attached again, and the next repair is started. [Effects of the Invention] Since the present invention has the configuration as described above, the following effects can be obtained. (1) According to the present invention, when repairing an underground pipeline that has damage such as breakage or holes, the diameter of the repair sleeve is expanded from inside the pipe while it is still installed inside the pipe in the 10-section section. Since it is a resmoking method that attaches to the surface of the pipe, it can be repaired to close cuts, holes, etc., and the areas where IM1g3 has occurred can be permanently corrected. (2) Also, sleeve expander B that performs such repairs
This is because the enlarged diameter head 3 is press-fitted so as to be drawn in from the open end side of the split sleeve 5 by the contraction operation of the piston rod 21, and is press-fitted so as to be drawn toward the hydraulic cylinder 1 side. Piston rod 2
1 has a structure that does not cause buckling, and even if the piston rod 21 is relatively thin and has a small diameter, it can exert sufficient pressing force in the direction of diameter expansion, so the sleeve expander itself also It can be constructed in a small size and can expand the range of applications for underground pipelines that require repair.

[Brief explanation of drawings]

Fig. 1 is an overall view of a sleeve dilator according to an embodiment of the present invention introduced into an underground pipeline, and Fig. 2 is a side view and a half-end view partially in section of another sleeve in the sleeve dilator. Fig. 3 shows a repair sleeve partially in section, a side view and a half-end view, Fig. 4 shows a side view partially in section of a coiled ring, and Fig. 5 shows a slit f = J ring. Fig. 6 is an explanatory diagram showing the state before expansion of the repair sleeve, and Fig. 7 is an explanatory diagram showing the state of the repair sleeve during diameter expansion. Figure 8 is an explanatory view of the state in which the diameter expansion head is pushed out after the diameter expansion of the repair sleeve is completed. 1...Hydraulic cylinder, 2...Piston, 21...
Piston rod, 3... Expanded diameter head, 4... Traction rope, 5... Split sleeve, 6... Repair sleeve,
7... Coiled ring, 8... Ring with slit,
11... Detachable bolt, 12.16... Hydraulic hose,
13.17...Joint, Δ...Underground pipe, Aa...
Damaged area. Patent No. 81 applicant Nippon Telegraph and Telephone Corporation
Hatsuko Co., Ltd. Agent Patent Attorney Nobu Kobashi Jundo Patent Attorney Susumu Murai Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] A hydraulic cylinder containing a piston is provided in an underground conduit that is damaged in the circumferential direction, and a piston rod is connected to the piston and protrudes from one end of the hydraulic cylinder,
A split sleeve that can be expanded in diameter is connected to the end face of the hydraulic cylinder on the side from which the piston rod protrudes, and a repair sleeve is fitted and held on the outer periphery of the sleeve, and a diameter expansion head that is press-fitted into the split sleeve is attached to the piston rod. By inserting a sleeve expander configured with a sleeve expander and operating the sleeve expander at a location where damage has occurred in the circumferential direction, the expanded diameter head is press-fitted into the split sleeve, and the expanded diameter head is moved through the split sleeve. In a repair method in which the diameter of the repair sleeve on the outer periphery is expanded and attached to the inner surface of the pipe at the damaged part, the diameter expansion head is directed toward the hydraulic cylinder from the open end of the split sleeve when the piston rod is retracted. An underground pipe repair device characterized by being configured to expand the diameter of a split sleeve and a repair sleeve by advancing press-fitting in a drawing manner.