JPH069402B2 - Underground pipeline repair device - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention, for example, in repairing an underground conduit that is laid underground to draw in a telecommunications cable, expands a repair sleeve from inside the pipe to the damaged portion of the underground conduit that is broken or has a hole. The present invention relates to a repairing device for repairing so as to be attached.

[Problems to be Solved by the Invention]

For example, the underground conduit that draws in the above-mentioned telecommunications cable,
Normally, multiple pipes with a diameter of 7 to 15 mm are laid in a group under the road or the like in an aggregated arrangement. A pipeline is laid at the same time, and a cable to be wired thereafter is selected by selecting an arbitrary pipeline which is the empty pipeline. In such underground pipes, the pipe body bends or breaks due to the fluctuation of the ground and the load of vehicles passing on the road, etc. over the years after installation, which causes a defective empty pipe. There is an inconvenience that it becomes a road and hinders the entry of a new cable. In the repair of such defective pipelines, conventionally, repair methods have 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 to block 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, the applicant of the present invention has proposed that, as a repairing method, a hydraulic cylinder containing a piston and a piston rod that is connected to the piston and projects from one end of the hydraulic cylinder are provided in an underground pipeline that has been damaged in the circumferential direction such as breakage. And a diameter expansion head for connecting a diameter-expandable split sleeve to the end surface of the hydraulic cylinder on the side where the piston rod projects, for fitting and holding a repair sleeve on the outer periphery thereof, and press-fitting into the split sleeve. Is inserted into the piston rod, the sleeve expander is inserted, and by operating the sleeve expander at a location where circumferential damage has occurred, the expansion head is press-fitted into the split sleeve, A separate repair method was proposed in which the diameter of the repair sleeve on the outer circumference was expanded via a split sleeve so that the repair sleeve could be attached to the inner surface of the damaged portion. The problem here is that in order to expand the diameter of the repair sleeve that fits and holds the expanding head into the split sleeve with slits and fits and holds it on the outer circumference to the required pipe inner diameter,
Since a considerable pressing force is required for this, particularly in the form in which the expanding head is pushed into the split sleeve by the expansion operation of the piston rod, the strength that prevents the piston rod from buckling against the pressing force. Therefore, since the piston rod has to be configured to be thick and large in diameter, the sleeve expander itself is also large and there is a restriction on the inner diameter of the underground conduit that passes through this, As for the underground pipeline, only a relatively thick pipeline could be repaired.

[Object of the Invention]

The present invention has been proposed to solve the above problems,
In the repair of the underground pipe, the repair sleeve attached to the inside of the damaged pipe is expanded and contracted by the piston rod.
When the diameter expansion head is press-fitted into the split sleeve to expand the diameter to the required inner diameter of the conduit, the piston rod is designed so as not to buckle and has a required pressing force in the diameter expansion direction. At the same time, it is an object of the present invention to provide a repair device for an underground conduit in which the piston rod is thin and the sleeve expander can be made compact.

In order to achieve this object, the present invention relates to the aforementioned sleeve expander, in which a diameter-expanding head press-fitted into the split sleeve is provided with a distal end opening side of the split sleeve when the piston rod contracts. It is characterized in that it is configured so that the split sleeve and the repair sleeve are expanded by press-fitting so as to be drawn closer to the hydraulic cylinder.

【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 an iron ball-shaped expanding head 3 is fixed to the projecting end of the piston rod 21 with a tightening bolt 31. Fastened and fixed. The expanding head 3
A pulling rope 4 is connected to the front end of the sleeve, and by pulling this, the sleeve expander B can be moved along the inside of the tube. Further, the hydraulic cylinder 1 includes a hydraulic hose 12,
By supplying the working oil into the oil chamber 1a on one side of the piston 2 through the joint 13 and the oil passages 14 and 15, the piston rod 21
Contracts, and hydraulic oil is supplied to the other oil chamber 1b side via the hydraulic port 16 and the joint 17 so that the piston rod 21
Is configured to perform a stretching operation. 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. And in the present invention, in particular, the piston rod 21
The penetrating through the inside of the split sleeve 5 and extending to the open end side thereof, the diameter expansion head 3 attached to the projecting end of the piston rod 21 has an open end portion of the split sleeve 5 when the piston rod 21 contracts. It is press-fitted into the slitted ring 8 so as to be pulled in from the side, and the expansion rod 3 advances toward the hydraulic cylinder 1 side by contraction of the piston rod 21. 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, the diameter-expanding head 3 is pressed into the slitted ring 8 by the contraction operation of the piston rod 21 so as to be pulled in from the open end side of the split sleeve 5, and is advanced toward the hydraulic cylinder 1 side. Therefore, the piston rod 21 does not buckle, and even when the piston rod 21 has a relatively small diameter, a sufficient pressing force can be exerted in the radial expansion direction. Thus, the press-fitting progress of the expanding head 3 causes the peripheral surface of the top part
In 3b, the diameter of the inner surface of the repair sleeve 6 is expanded so as to be flush with the inner surface of the conduit A, and the diameter of the conduit A itself is also expanded so that the diameter expansion head 3 is located inside the extension portion 5b of the split sleeve 5. In the state where the repair sleeve 6 does not project to the inner surface of the underground pipeline A as shown in FIG.
A repair sleeve 6 is attached to the inner surface of the pipe so as to close the cut. The repair sleeve 6 remains attached to the inner surface of the pipe because it is plastically deformed and expanded in diameter.
On the other hand, since the split sleeve 5, the coiled ring 7 and the slitted ring 8 have some elastic strain (spring back) left on themselves, after the expansion head 3 advances, these are sequentially compressed after passing. It is in a state of being diametrically separated from the repair sleeve 6. After the repair sleeve 6 has been attached to the damaged portion Aa, pressure oil is then introduced into the other oil chamber 1b of the hydraulic cylinder 1 via the hydraulic hose 16 and the joint 17 to cause the piston 2 to move.
Moves to the left and the piston rod 21 extends, so that the diametrical expansion head 3 escapes from the extension 5b side of the split sleeve 5 toward the tip open side in the direction opposite to the press-fitting direction. To be done. 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. 8th by diameter
As shown in the figure, it is completely peeled off 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 invention's effect】

Since the present invention has the configuration as described above, the following effects can be obtained. (1) First, according to the present invention, in repairing an underground conduit having damage such as a breakage or a hole, a repair sleeve is attached to the damaged part by expanding the diameter of the repair sleeve from the inside of the pipe in the installed state. Since the repair is performed as described above, it is possible to repair so as to close the cuts and holes and to permanently repair the damaged portion to the corrected state. (2) Further, in the sleeve expander B for performing such repair, the expanded head 3 is press-fitted so as to be pulled in from the tip open side of the split sleeve 5 by the contraction operation of the piston rod 21, and is directed toward the hydraulic cylinder 1 side. Since the piston rod 21 is configured so that it does not buckle, the piston rod 21 exerts sufficient pressing force in the expanding direction even if the piston rod 21 has a relatively small diameter. As a result, the sleeve expander itself can be constructed in a small size, and the applicable range of the underground pipeline to be repaired can be expanded.

[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. The figure is an explanatory view of a state where 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 ... 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 parts.

Front page continued (72) Inventor Takayuki Kamo 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Inventor Fumio Yabuhara 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo Nihon Telegraph Telephone Co., Ltd. (72) Inventor Motoyuki Koga 1-9-18 Nakamachi, Meguro-ku, Tokyo (72) Inventor Akira Shimada Four stock companies, 3-18, Daiko City Kanagawa Prefecture.

Claims (1)

[Claims] 1. In an underground conduit that is damaged in the circumferential direction,
A hydraulic cylinder containing a piston and a piston rod connected to the piston and projecting from one end of the hydraulic cylinder are provided, and an expandable split sleeve is connected to the end surface of the hydraulic cylinder on the side where the piston rod projects. Insert a sleeve expander configured by fitting and holding a repair sleeve on its outer circumference and attaching a diameter expansion head that press-fits to the split sleeve to the piston rod, where it is damaged in the circumferential direction. By operating the above-mentioned sleeve expander, the expansion head is press-fitted into the split sleeve, and the repair sleeve on the outer circumference is expanded through the split sleeve so as to be attached to the inner surface of the pipe at the damaged portion. At the time of contraction operation of the piston rod, the expanding head is pulled toward the hydraulic cylinder from the open end side of the split sleeve. ON advanced to split sleeve repair device underground pipe characterized by comprising configured to the diameter operation of the repair sleeve.