JPS62155713A - Repair work of 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]

The present invention relates to a method for repairing underground conduits, such as those laid underground for the purpose of bringing in telecommunication cables, and more specifically, the present invention relates to repair methods for underground conduits, such as underground conduits that are laid underground to lead in telecommunications cables, and more specifically, This invention relates to a repair method for repairing a damaged part by expanding the diameter of a repair sleeve from inside the pipe and attaching it to the damaged part so as to close the damaged part.

[Problems to be solved by the invention]

For example, the above-mentioned underground passageway for connecting the Dentsu TRI cable is usually made up of 11 stages of multiple pipes with a diameter of 7 to 15 nm+ arranged in a row underground, such as under a road. At the time of installation, an extra empty pipe line that is expected to be added in the future is installed at the same time (FI), and the cooler to be wired from now on is connected to any pipe that is less than two lines with the empty pipe line. By the way, over the years after installation, underground pipes like this are prone to bending or bending due to changes in the ground or the load of vehicles passing on the road. There is an inconvenience that a difference in level occurs at the 11th turn, which results in a defective empty conduit line and hinders the installation of new cables.In the past, when repairing such defective conduit lines, a pipe was installed inside the underground conduit line. Repair methods such as straightening a folded pipe at an uneven level using a straightening device or expanding the diameter of a dented part have been carried out, but if the pipe is bent or has a hole, the lifting platform or the above-mentioned problem may occur. By simply straightening the pipe, it was not possible to close the bent part or hole, and the damaged part was not completely repaired.

[Purpose of the invention]

The present invention was proposed to solve the above problems, and
After the pipe has been straightened, a repair sleeve can be attached from inside the pipe to the damaged part of the underground pipe where there is a crease or hole, so as to seal the damaged part. The aim is to provide a method for repairing underground pipes that can be repaired. [Structure 1 of re-mei] In order to achieve this object, the present invention provides a sleeve expansion method for repairing underground pipelines that are damaged in the circumferential direction, by expanding the diameter of a repair sleeve and attaching it to the pipeline. Introducing the equipment,
The sleeve expander connects a diameter-expandable split sleeve to the end face of a hydraulic cylinder, fits and holds a repair sleeve around its outer periphery, and further winds a bonded body impregnated with adhesive around its outer periphery. The diameter expansion head, which is press-fitted into the split sleeve, is attached to the piston rod protruding from the hydraulic cylinder (h), and the diameter is expanded by operating the expander (L) at the location where the damage has occurred in the circumferential direction. The head is press-fitted into the split sleeve, and the diameter of the repair sleeve on the outer periphery is expanded through the split sleeve, and the adhesive impregnated in the bonded body on the outer periphery is pushed out by the diameter expansion operation of the repair sleeve. () The repair sleeve is attached and repaired by adhesively bonding it to the inner surface of the pipe.

【Example】

Hereinafter, one embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 does not show the state in which the sleeve dilator B of the present invention is introduced into the underground pipe A where the breakage has occurred. 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 the piston 2 at one end thereof.
A piston rod 21 that is connected to the piston rod 21 protrudes, and an iron ball-shaped enlarged diameter head 3 is fastened and fixed to the protruding end of the piston rod 21 with a bolt 31 having a diameter of 14. A pulling row 14 is connected to the front end of the diameter-expanding head 3, and by pulling the pulling row 14, the sleeve dilator B can be moved along the inside of the tube. Further, the hydraulic cylinder 1 has a hydraulic hose 12. Joint 13. Hydraulic oil is supplied into the oil chamber 1a on one side of the piston 2 through the oil passages 14 and 15, causing the piston rod 21 to contract, and the hydraulic oil to be supplied to the hydraulic bow 16. The piston rod 21 is configured to operate smoothly by supplying the oil to the other oil chamber 1b side 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 circumferential 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 toward the distal end side of the split sleeve 5, and the distal end side is in a separated form, and the enlarged diameter head 3 is press-fitted from the open distal end side, thereby making it easy to expand outward. In the circumferential direction, the split sleeve 5 has an enlarged diameter portion 5a on the open end side, and an extension portion 5b on the inner side, so that the enlarged diameter head 3 forms the enlarged diameter portion 5a by the contraction operation of the piston rod 21. It is possible to press-fit the extension part 5b through the inside of the extension part 5b. A short tubular repair sleeve G 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 thin-walled and cylindrical and has a wall thickness that makes it easy to expand the diameter. 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 repair sleeve 6 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. In the present invention, a bonded body 7 impregnated with an adhesive is further wound around the outer periphery of the repair sleeve 6. This bonded body 7 is made of a sheet of felt or sponge, for example, and is entirely impregnated with a FIfLvJ adhesive so that the inside thereof can be impregnated with an adhesive. The body 7 may be made by directly applying butyl rubber to the outer periphery of the repair sleeve 6. Next, an example of use and operation of the sleeve dilator B configured as described above will be explained. First, for underground pipe A that requires repair, use a pipe camera, for example, from the manhole that is the opening of the underground pipe A.
Insert the tube into the tube to observe the damaged condition, and if the observation results show that the tube has become uneven due to breakage, the uneven condition can be corrected by inserting a known tube straightening device into the tube in advance. After the correction, the sleeve dilator B of the present invention is introduced into the underground conduit Δ from one manhole side, and the sleeve dilator B is pulled along the inside of the pipe by pulling the pulling row 14 from the other manhole side. Then, the movement is stopped at the location Aa where the Jalet is occurring. During this stop, the repair sleeve G is positioned so as to bridge the cut at the IFA damage location Aa based on the results observed in advance. Next, in this state, hydraulic oil is supplied to the hydraulic hoses 12, 11 and 13 using the hydraulic pump cap. The piston 2 is introduced into the oil chamber 1a of the hydraulic cylinder 1 through the oil passage 14.15, and the piston 2 moves to the right with respect to the hydraulic cylinder 1, and the expanding head 3 is moved by the contraction movement of the piston rod 21. It is press-fitted so as to be pulled in from the open end side of the split sleeve 5. As a result, a pressing force (pressing force in the diameter expanding direction) is generated on the tapered surface 3a of the diameter expanding head 3 so that the split sleeve 5 with the slit and the repair sleeve 6 fitted therewith are pushed outward and expanded. The pressing force is evenly distributed in the same direction through 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 circumferential surface of the conduit A. At this time, in the present invention, as described above, the repair sleeve 6
Since the bonded body 7 impregnated with adhesive is further wound around the outer periphery of the repair sleeve 6, when the repair sleeve 6 is expanded in diameter and attached to the inner surface of the pipe, the repair sleeve 6 is wound through the bonded body 7. The diameter is expanded so that it joins to the inner surface of the tube. As a result, the adhesive impregnated in the bonded body 7 is pushed out so as to be interposed over the entire surface between the repair sleeve 6 and the inner surface of the tube due to the suppressing action caused by the expansion of the diameter of the repair sleeve 6. The repair sleeve 6 is attached to the inner surface of the tube so as to be adhesively bonded thereto. In this way, as the diameter-expanding head 3 advances, the diameter of the repair sleeve 6 is expanded by the top circumferential surface 3b so that the inner circumferential surface of the repair sleeve 6 is flush with the inner circumferential surface of the conduit A, and further When the diameter of the conduit A itself is expanded and the expanded diameter head 3 advances to the inside of the extension part 51) of the split sleeve 5, the fifth
As shown in the figure, the repair sleeve 6 is attached to the inner surface of the underground pipe A so as to close the break at the damaged area Aa without protruding from the inner surface of the underground pipe A. Note that the repair sleeve 6 remains attached to the inner surface of the pipe by being plastically deformed, but on the other hand, the inner split sleeve 15
Since some elastic strain (springback) remains in itself, after the diameter-expanding head 3 advances, the diameter of the diameter-expanding head 3 is sequentially reduced and separated from the repair sleeve G. Above) Once the repair sleeve 6 has been attached to the water-damaged area Aa, the piston 2 is replaced by introducing pressure oil into the other oil chamber 1b of the hydraulic cylinder 1 via the hydraulic hose IQ and the 11 hand 17. Since the piston rod 21 moves to the left and the piston rod 21 moves, the enlarged diameter head 3 moves from the extension part 51) side of the split sleeve 5 to the tip 17n, opposite to the press-fitting direction.
It escapes by pushing toward the release side (see Figure 6). In addition, in that case, the traction D-p4 is wound up and the sleeve dilator B is removed.
After pulling out the sleeve expansion a B to the front or by pulling the hydraulic hose 12, remove the 5ill sleeve 5 in the row to be used with the detachable bolt 11, and insert a new split sleeve 5 here again. Then move on to the next repair. [Effects of the Invention 1 Since the present invention is a repair method as explained above, the following effects can be obtained. (1) First, according to the present invention, when repairing an underground pipe that has damage such as folds or holes, a repair sleeve is inserted from inside the pipe into the mouth of the mouth with the cloth submerged. Since it is a repair method that expands the diameter and attaches it to the inside of the damaged pipe, it can close cuts and holes, and repair the damaged pipe to a permanently straightened state. I can do it. (2) In the above-mentioned repair, according to the present invention, a bonded body impregnated with adhesive is further wound around the outer periphery of the repair sleeve, so that when the repair sleeve is expanded in diameter, The pressing force pushes out the adhesive impregnated into the joint, and the adhesive adheres the repair sleeve to the inner surface of the pipe, ensuring that the repair sleeve is attached to the inner surface of the pipe. This not only makes it possible to permanently repair the n(easy spots in the pipe) to a straightened state, but also improves the sealing effect of the adhesive, so it can be repaired to improve the airtightness of the pipe.

[Brief explanation of drawings]

Fig. 1 is an overall view of a sleeve dilator according to an embodiment of the present invention introduced into a passageway underground, and Fig. 2 is a side view partially showing a split sleeve in the sleeve dilator. Fig. 3 is a side view and half-end view showing a sleeve for Urakuse with a partial cross section, Fig. 4 is a side view and a partially cross-sectional side view of the joined body, and Fig. is an explanatory diagram showing the state of the repair sleeve before diameter expansion, Figure 6 is an explanatory diagram showing the state of the repair sleeve during diameter expansion, and Figure 7 is an explanatory diagram showing the state of the repair sleeve after diameter expansion. It is an explanatory view of a state in which the diameter head is pushed out. 1... Hydraulic cylinder, 2... Piston, 21...
Piston [] Tsurad 3... Expanded diameter head, 4... Traction lobe, 5... Split sleeve, 6... Repair sleeve, 7... Joined body, 11... Detachable bolt, 12. 16
...Hydraulic hose, 13.17...Fitting, △...Underground pipe, Aa...Damaged area. Patent applicant Nippon Telegraph and Telephone Corporation
Hatsukou Co., Ltd. Agent Patent Attorney Nobuko Kobashi Ukiyo Patent Attorney Susumu Murai Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] When repairing an underground pipeline that has been damaged in the circumferential direction, a sleeve expander is introduced that expands the diameter of a repair sleeve and attaches it to the pipe. A diameter-enlarged split sleeve is connected, a repair sleeve is fitted and held on the outer periphery of the sleeve, and a bonded body impregnated with adhesive is wound around the outer periphery of the split sleeve, and a diameter expanding head is press-fitted into the split sleeve. It is attached to a piston rod that protrudes from a hydraulic cylinder, and by operating the expander at a circumferentially damaged location, the expanded diameter head is press-fitted into the split sleeve, and the expander is moved through the split sleeve. First, the diameter of the repair sleeve on the outer periphery is expanded, and the adhesive impregnated in the joint on the outer periphery is pushed out by the diameter expansion operation of the repair sleeve, and the repair sleeve is adhered and bonded to the inner surface of the pipe for repair. A repair method for underground pipes characterized by: