JPH0630529B2 - Underground pipeline repair method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an underground pipe having a break or a hole in repairing an underground pipe which is laid underground for drawing in a cable for telecommunication, for example. The present invention relates to a repairing method for an underground pipeline, which repairs the damaged portion of the channel so that the diameter of the repairing sleeve is expanded and attached from the inside of the pipeline in the installed state.

[Conventional technology]

For example, an underground pipe line laid to draw in the above-mentioned telecommunication cable usually has a diameter of 7 to 1 below the road.
It is made by laying a plurality of 5 cm pipes in a collective arrangement, and at the time of the first laying construction, an extra empty pipeline that is expected to be expanded in the future is laid at the same time. After that, the cable to be wired is selected by pulling in an arbitrary pipeline which is the empty pipeline.

By the way, such underground pipes may be defective due to bending or breakage of the pipe body due to changes in the ground or the load of vehicles passing on the road over the years after installation. However, there is an inconvenience that it becomes an empty pipe line and hinders the drawing of a new cable.

[Problems to be Solved by the Invention]

In repairing such defective pipelines, repair methods have conventionally been carried out, such as straightening a broken pipe in a stepped state through a straightening device for the pipe inside the underground pipeline or expanding the recessed portion. However, if the pipe is broken or has a hole, it cannot be repaired so as to close the fold or hole by just correcting the pipe as described above, and the repair of the damaged part is not complete. It was

Therefore, it is conceivable to repair the inside of the pipe at the above-mentioned damaged location so that the sleeve is expanded and attached from the inside of the pipe in the installed state. The sleeve expansion method for such repair is as follows.
The overall length of the device is shortened so that it can be easily passed through underground pipes with curved pipe sections. In addition, when inserting the device into the pipe, it is easy to pass through, the gap between the repair sleeve and the inner surface of the pipe is large before the diameter expansion, and the diameter of the repair sleeve is greatly expanded during the diameter expansion operation. The structure must be such that a large diameter expansion dimension can be secured so that it can be securely attached to the inner surface of the pipe. Further, the device is required to have a simple structure and be easy to operate because it is inserted into an installed underground pipe and operated underground.

The present invention has been made for the purpose of solving the above problems.

[Means for Solving the Problems]

In order to achieve this object, the present invention is a hollow cylinder in which an elastic body having front and rear end plates and having a body portion expandable in a diametrical direction is formed in an underground pipeline damaged in the circumferential direction. -Type sleeve expander is inserted with the repair sleeve fitted around the outer circumference of the body, and at the damaged location, a fluid such as hydraulic pressure or air is pressed into the hollow of the expander. By doing so, the body portion is expanded, and the expansion sleeve expands the diameter of the repair sleeve that fits and holds the outer circumference, and repairs the inner surface of the damaged portion so as to attach it.

[Action]

The method of repairing an underground conduit of the present invention by the above means is to insert a sleeve expander into a damaged portion of the underground conduit that is broken or has a hole, and expand the body of the expander by hydraulic pressure or air pressure. It is possible to expand the diameter of the repair sleeve that fits and holds the outer circumference by the expansion pressure, attach the repair sleeve to the inner surface of the pipe at the damaged portion, and close the folds or holes.

〔Example〕

 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 expander B of the present invention is introduced into the pipe of the underground pipe A in which breakage has occurred. The above-mentioned sleeve expander B is of a hollow cylindrical shape, and the end plates 1,
2, and the body 3 is made of an elastic body that is expandable in the diametrical direction. Between the front and rear end plates 1 and 2, a rod 4 is pierced through the center of the body 3. This rod 4
Due to this, the facing distance between the end plates 1 and 2 is regulated. That is, the rod 4 is inserted from the end plate 2 on the rear side and pulled out from the end plate 1 on the front side, and by tightening the nut 43 screwed to the front part thereof, the step portion on the rear side of the rod 4 is obtained.
41 is the center of the outer surface of the rear end plate 2 and the step on the front side
42 are locked to the center of the inner surface of the front end plate 1, respectively, and the facing distance between the front and rear end plates 1 and 2 is regulated to a predetermined value.

A pulling rope 45 is connected to the front end of the rod 4 via a connecting metal fitting 44, and the sleeve expander B can be moved along the tube by pulling the pulling rope 45. On the rear side, an oil passage 46 is formed so as to open the inside of the rod 4, and a hydraulic hose 47 is connected to the oil passage 46. From this, pressure oil is introduced into the body 3 through the oil passage 46. (This may be a fluid such as air).

The body portion 3 has both end portions 31 and 32 in contact with the front and rear end plates 1 and 2.
However, in order to have a required sealing effect with respect to the end plates 1 and 2, both end portions 31 and 32 of the body portion 3 have their central portions 33 and 34 surrounding the rod 4 so as to close the end plates 1 and 2. The rod 4 is fitted in the central hole, and the rod 4 is fitted in the fitting portion.
The seal member 5 is fitted between the central portion 33 and the central portion 33, 34 of the body portion 3, so that the inside of the body portion 3 is kept airtight.

Further, on the inner surface of each of the end plates 1 and 2, the body portion 3 facing each other is provided.
A slider 11 capable of appearing and retracting outwardly (diameter direction) is interposed between and, and this slider 11 is divided into a plurality of pieces in the circumferential direction, and when the body part 3 expands, it slides outwardly. The side portion of the body portion 3 is restricted so that the body portion 3 can expand only in the diametrical direction. And slider
A coil spring 12 is wound around the outer periphery of the slider 11, and the contracting force always causes the slider 11 to be inwardly reduced in diameter so that the body portion 3 is in a contracted state. A required gap is formed between the inner surface and the inner surface.

Then, the repair sleeve 6 is directly fitted to the outer peripheral surface of the body portion 3. The repair sleeve 6 is expanded outside by the expansion of the body portion 3 and attached to the inside of the repair portion Aa of the underground pipeline A. Therefore, the repair sleeve 6 has a thin cylindrical shape. It has a wall thickness that facilitates diameter expansion. Although the repair sleeve 6 is made of steel pipe, it may be made of a material whose diameter can be easily expanded.

Next, a usage example and operation of the sleeve expander B configured as described above will be described.

First of all, for the underground pipeline A that needs to be repaired, for example, from the manhole that is the opening, attach a pipe camera to the underground pipeline A.
If the result of the observation is that a step difference is caused by breakage, a known tube straightening device is inserted in advance into the duct to correct the step difference.

After the correction, the sleeve dilator B of the present invention is introduced into the underground conduit A from one manhole side, and the tow rope 45 is pulled from the other manhole side to guide the sleeve dilator B along the pipe. The movement is stopped and the movement is stopped at the damaged portion Aa. At the time of this stop, the repair sleeve 6 is positioned so as to bridge both pipe ends of the break of the damaged portion Aa according to the result observed in advance.

Next, in this state, pressure oil is pressed into the body portion 3 via the hydraulic hose 47 and the oil passage 46 by the hydraulic pump or the like, whereby the body portion 3 is expanded in the diametrical direction, and the expansion pressure is increased. Is distributed evenly over the entire surface in the circumferential direction of the body portion 3, and the repair sleeve 6 fitted and held on the outer periphery of the body portion 3 is plastically deformed so as to expand toward the outside, and the inner surface of the pipeline of the damaged portion Aa is Attach it so as to close the break.

After the repair sleeve 6 has been attached to the damaged portion Aa, a cock (not shown) interposed in the hydraulic hose 47 is opened to release the pressure oil in the body portion 3, which acts on the body portion 3. The expanding force is canceled and the body 3 contracts. At this time, the slider 11 is radially contracted by the contracting force of the coil spring 12 wound around the outer periphery of the slider 11, so that the body portion 3 is contracted, thus leaving the repair sleeve 6 attached to the inner surface of the pipe. And the body portion 3 is separated toward the center of the conduit A.

After that, the tow rope 45 is wound up and the sleeve dilator B is pulled out forward, or the hydraulic hose 47 is pulled out and the sleeve dilator B is pulled out backward, and then the repair sleeve 6 is again attached to the outer peripheral surface of the body 3. It is to be fitted and held on and then moved to the next repair.

〔The invention's effect〕

Since the present invention has the configuration as described above, the following effects can be obtained.

First, according to the present invention, on the inner surface of the underground pipeline where breakage or damage such as a hole has occurred, the repair sleeve is repaired by expanding the diameter of the repair sleeve from the inside of the pipeline, so that the break The holes and holes can be repaired so as to close the sleeve, and the damaged area can be permanently maintained in a straightened state.

The sleeve expander also has a repair sleeve that expands and attaches to the inside of the pipe and is fitted directly to the outer circumference of the diametrically inflatable body, and is repaired by the hydraulic pressure or the inflation pressure such as air that is pressed into the body. Since the sleeve is configured to be expanded in the diametrical direction, the entire device can be greatly shortened and the curved pipe portion can be easily passed.

Further, since the sleeve expander is configured to expand the body in the diametrical direction by the expansion pressure such as hydraulic pressure or air that is press-fitted into the body, it is possible to secure a large diameter expansion dimension. Since the gap between the pipe and the inner surface of the pipe can be increased, passage of the sleeve expander inserted in the pipe can be facilitated, and the structure of the device can be greatly simplified.

[Brief description of drawings]

FIG. 1 is an overall vertical cross-sectional view of a sleeve dilator according to an embodiment of the present invention introduced into an underground conduit, and FIG. 2 is a C of FIG.
Fig. 3 is a sectional view taken along line -C, Fig. 3 is a longitudinal sectional view showing a state in which the diameter of the repair sleeve is expanded, and Fig. 4 is a sectional view taken along line CC of Fig. 1 in the state of Fig. 3. 1, 2 ... End plate, 11 ... Slider, 12 ... Coil spring, 3 ... Body, 31,32 ... Body end, 33,34 ... Body center, 4 ... Rod, 41, 42 ... Step, 43 ... Tightening nut, 4
4 ... Connection fitting, 45 ... Tow rope, 46 ... Oil passage, 47 ... Hydraulic hose, 5 ... Seal, 6 ... Repair sleeve, A ... Underground pipeline, Aa ... Damaged part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takayuki Kamo 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Inventor Fumio Yabuhara 1-1-6 Uchiyuki-cho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Inventor Motoyuki Koga 1-9-18 Nakamachi, Meguro-ku, Tokyo (72) Inventor Akira Shimada Four-share company, Hatsuko Development Technology Research Co., Ltd., 3-18 Daikan City, Kanagawa Prefecture In-house

Claims (1)

[Claims] 1. In an underground conduit that is damaged in the circumferential direction,
Insert a hollow cylindrical sleeve expander that has end plates in the front and rear and the body is made of an elastic body that is expandable in the diametrical direction with the repair sleeve fitted and held on the outer periphery of the body. , The body is inflated by pressurizing fluid such as hydraulic pressure or air into the hollow of the dilator at the location where it is damaged, and the expansion sleeve expands the diameter of the repair sleeve that fits and holds the outer periphery. A repairing method for an underground conduit, which is characterized by repairing the damaged part so that it is attached to the inner surface of the damaged part.