JPH069403B2 - Underground pipeline repair method - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a method for repairing an underground pipe, which is laid underground for drawing in a cable for telecommunications, for example, and more specifically, a damaged portion of the underground pipe such as breakage, separation, or a hole. In addition, the present invention relates to a method for repairing an underground pipe, in which a repair sleeve is attached from inside the pipe in the installed state to repair the damaged portion.

2. Description of the Related Art For example, an underground pipe for introducing the above-mentioned telecommunication cable is
Normally, multiple pipes with a diameter of 7 to 15 cm are laid in a group under a road or the like in an aggregated state. An empty pipeline is laid at the same time, and thereafter, a cable to be added is drawn in by selecting an arbitrary pipeline which is the empty pipeline. By the way, in such underground underground pipelines, due to changes in the ground and the load of vehicles passing on the road, etc., the pipe body bends or breaks due to changes in the ground, etc. There is an inconvenience that it hinders the entry of a new cable.

[Problems to be Solved by the Invention]

In the repair of such defective pipelines, conventionally, repair methods such as straightening a pipe in a stepped state or broken state by inserting a straightening device for the pipe into the underground pipeline and expanding the recessed part have been implemented. However, if the pipe is broken or has a hole, it cannot be repaired to block the fold or hole by just correcting the pipe as described above, and the repair of the damaged part is complete. It wasn't.

[Means for solving problems]

In view of the above, the present invention inserts a short tubular repair sleeve into the underground pipeline that is damaged in the circumferential direction, expands the diameter of the sleeve, and attaches the sleeve to the damaged location in the circumferential direction. It is characterized by repairing parts.

【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 sleeve expander B described above has the following structure based on the hydraulic cylinder 1 having the piston 2 therein. That is, a piston rod 21 connected to the piston 2 is projected at one end of the hydraulic cylinder 1, and a spherical ball-shaped expanding head 3 made of iron is attached to the tightening bolt 31 at the projecting end of the piston rod 21. It is fastened and fixed with. A pulling rope 4 is connected to the front end of the diameter expanding head 3 so that the sleeve expander B can be moved along the tube by pulling the pulling rope 4. Further, in the hydraulic cylinder 1, the hydraulic oil is supplied into the oil chamber 1a on one side of the piston 2 through the hydraulic hose 12, the joint 13, and the oil passages 14 and 15 so that the piston rod 21 contracts. Hydraulic fluid 16
The piston rod 21 is configured to extend by being supplied to the other oil chamber 1b side via 17. A split sleeve 5 which can be expanded in diameter is connected via an attachment / detachment bolt 11 to the end surface 1c of the hydraulic cylinder 1 on the side where the piston rod 21 is projected. In this split sleeve 5, as shown in FIG. 2, a plurality of slits 51 extending in the cylinder direction are provided in parallel (six in the figure) at a predetermined equal pitch in the circumferential direction, and The slit 51 is opened toward the tip end side of the split sleeve 5, and the tip end side is in a divided form, and the diameter expansion head 3 is press-fitted from the tip end open side to facilitate the outward expansion. Therefore, in the split sleeve 5, in the cylinder direction, the diametrical expansion portion 5a is formed in the upper half portion on the front end open side and the extension portion 5b is formed in the inner side. It is possible to press-fit and proceed through the extension 5b. On the outer periphery of the split sleeve 5, a short tubular repair sleeve 6 is fitted and held outside the expanded diameter portion 5a. This is the one whose diameter is expanded outward by the split sleeve 5 and which is attached to the inside of the repair partial pipe of the underground pipeline A. Therefore, the repair sleeve 6 is expanded as a thin-walled cylindrical one as shown in FIG. The inner diameter of the repair sleeve 6 is formed on the outer peripheral surface of the split sleeve 5 so as to prevent the holding position from being displaced inward (the press-fitting direction of the diameter expansion head 3) when the diameter is expanded. It is locked to the stepped portion 52 projecting to the. The repair sleeve 6 is made of steel pipe, but it may be made of a material whose diameter is easily expanded. A coiled ring 7 as shown in FIG. 4 is provided on the inner peripheral side of the split sleeve 5, and a fifth coil is provided on the inner peripheral side thereof.
A slitted ring 8 as shown in the figure is installed. The coiled ring 7 and the slitted ring 8 are both introduced in order to secure a required diameter expansion dimension when the diameter expansion head 3 is press-fitted.
That is, if the wall thickness of the split sleeve 5 is made thicker than necessary, the diameter expansion operation is hindered, and therefore the thickness cannot be made thicker than necessary. Therefore, the coiled ring 7 and the slitted ring 8 cannot be formed inside the split sleeve 5. Although introduced on the circumferential side, the coiled ring 7 and the slitted ring 8 have a wall thickness that ensures the required expanded diameter dimension by devising the form of the split sleeve 5, and The coiled ring 7 and the slit ring 8 may be omitted as long as the 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 expander B of the present invention is introduced into the underground conduit A from one manhole side, and the tow rope 4 is pulled from the other manhole side to move the sleeve expander 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 the break of the damaged portion Aa according to the result observed in advance. Next, in this state, hydraulic oil is supplied to the hydraulic hose using a hydraulic pump, etc.
Oil chamber of hydraulic cylinder 1 through 12, joint 13, oil passages 14 and 15
The piston 2 is moved to the right with respect to the hydraulic cylinder 1 by the contraction operation of the piston rod 21 so that the diameter expansion head 3 is pulled in from the open end side of the split sleeve 5. It is pressed into the attached ring 8. As a result, a pressing force is generated on the tapered surface 3a of the diameter expanding head 3 so that the split sleeve 5 with slits and the repair sleeve 6 fitted thereto are expanded outward, and the pressing force is a coil shape. The springs 7 and the split sleeve 5 are evenly distributed in the circumferential direction, and the repair sleeve 6
Is plastically deformed outward so that the diameter gradually increases from one end and is attached to the inner peripheral surface of the conduit A. At this time, due to the progress of press-fitting of the expanding head 3, the peripheral surface of the top part thereof is
In 3b, the inner peripheral surface of the repair sleeve 6 is expanded so as to be flush with the inner peripheral surface of the conduit A, and the conduit A itself is also expanded so that the expanding head 3 extends the split sleeve 5. Proceed to within part 5b. In this state, as shown in FIG. 7, the repair sleeve 6 is attached to the inner surface of the underground pipe A so that the repair sleeve 6 does not project to the inner surface of the underground conduit A so as to close the break of the damaged portion Aa. Note that the repair sleeve 6 remains attached to the inner surface of the pipe because it is plastically deformed and expanded in diameter, while the split sleeve 5, the coiled ring 7, and the slitted ring 8 are themselves attached. Since some elastic strain (springback) remains, the diameter of the expanding head 3 is gradually reduced after passing through the expanding head 3, and the repairing sleeve 6
It will be in the state of peeling from. After the repair sleeve 6 has been attached to the damaged portion Aa, the piston 2 is moved leftward by introducing it into the other oil chamber 1b of the hydraulic cylinder 1 via the pressure oil hose 16 and the joint 17. Since the piston rod 21 extends,
The expanding head 3 has a split sleeve 5 opposite to the press-fitting direction.
It is escaped by pushing from the extension portion 5b side toward the tip open side. At the time of this escape, the split sleeve 5, the coiled ring 7, and the slitted ring 8 are contracted by the elastic strain partially remaining in the repair sleeve 6 whose diameter is expanded by plastic deformation as described above. By making the diameter, as shown in FIG. 8, it is completely separated from the repair sleeve 6. After that, the tow rope 4 is wound and the sleeve expander B is pulled out forward, or the hydraulic hose 12 is pulled out and the sleeve expander B is pulled out backward, and then the used split sleeve 5 is removed by the detachable bolt 11. The new split sleeve 5 is attached again here and the next repair is performed. The pipeline A repaired in this way is provided with a repair sleeve 6
In the repaired part where the ridge is attached, a concave portion is formed on the inner peripheral surface. Therefore, in order to form the resin lining layer so as to eliminate the concave portion, the lining pig 18 is removed from one manhole as shown in FIG. When the resin P for lining is inserted into the pipe line A, and the lining resin P is injected into the front face thereof and pulled through by the wire 19, the resin P is pressed against the inner peripheral face of the pipe by the conical surface of the tip of the pig 18 to form the concave portion. Along with the filling, a lining layer Pa having a predetermined thickness is formed on the inner peripheral surface of each of the conduit A and the repair sleeve 6, and the inner surfaces are further smoothed,
Subsequent insertion of the cable can be extremely facilitated. With the resin lining layer Pa formed further,
The repair sleeve 6 is fixed to the inner peripheral surface of the conduit A, and permanently maintains the damaged portion in a straightened state.

【The invention's effect】

INDUSTRIAL APPLICABILITY Since the present invention is the repairing method as described above, when repairing an underground pipeline having damage such as breakage, step difference (detachment), or damage such as a hole, the inside of the damaged pipe is laid in the condition Further, since the repair sleeve is attached to repair, it is possible to repair so that the slits or holes are covered with the sleeve, and the damaged portion can be permanently repaired to a straightened state.

[Brief description of drawings]

FIG. 1 is an overall view of a state in which a sleeve expander according to an embodiment of the present invention is introduced into an underground pipeline, and FIG. 2 is a side view and a half-end view partially showing a split sleeve in the sleeve expander. Fig. 3 is a side view and a half-end view showing a repair sleeve in a partial cross section, Fig. 4 is a side view showing a coiled ring in a partial cross section, and Fig. 5 is a partial view of a slit ring. FIG. 6 is an explanatory view showing a state before the diameter expansion of the repair sleeve, FIG. 7 is an explanatory view showing a state during expansion of the repair sleeve, and FIG. FIG. 9 is an explanatory view of a state in which the diameter expansion head is pushed out after the diameter expansion of the repair sleeve is completed, and FIG. 9 is a conceptual diagram of resin filling. 1 ... Hydraulic cylinder, 2 ... Piston, 21 ... Piston rod, 3 ... Expanding head, 4 ... Traction rope, 5 ... Split sleeve, 6 ... Repair sleeve, 7 ... Coil ring, 8 ... Slit ring, 11 ... Detachable bolts, 12, 16 ... Hydraulic hoses, 13, 17 ... Joints, A ... Underground pipeline, Aa ... Damaged part, P
… Filling resin, Pa… Resin lining layer.

 ─────────────────────────────────────────────────── ─── 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,
A repairing method for an underground conduit, characterized in that a repair sleeve having a short tubular shape is inserted, and the sleeve is expanded in diameter so as to be attached to a damaged portion in the circumferential direction to repair the damaged portion.