JPH069404B2 - 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, several 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 pulling in of a new cable. 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, repairing the damaged part was not complete because it could not be repaired by only correcting the pipe as described above so as to close the fold or hole. . Therefore, as a repairing method, the applicant has a hydraulic cylinder having a piston inside and a piston rod that is connected to the piston and projects from one end of the hydraulic cylinder, in an underground pipeline that is damaged in the circumferential direction. Then, a split sleeve with a slit capable of expanding the diameter is connected to the end surface of the hydraulic cylinder on the side where the piston rod projects, and a repair sleeve is fitted and held on the outer periphery of the split sleeve, and the expander head is press-fitted into the split sleeve. Insert the sleeve expander configured by attaching to the piston rod, and operate the expander at a location where damage is occurring in the circumferential direction to move the expansion head by press fitting into the split sleeve. Expand the diameter of the split sleeve, and then expand the diameter of the repair sleeve on the outer circumference through the split sleeve to attach the repair sleeve to the inner surface of the damaged portion of the pipe. A repair method that was proposed separately. The problem here is that the expansion head is press-fitted into the slit sleeve with a slit, and the repair sleeve fitted and held on the outer periphery of the split sleeve is pressed to the required inner diameter of the pipeline. To expand the diameter up to that, a corresponding pressing force (pressing force for expanding the diameter) is generated, and this pressing force causes the split sleeve to move the expansion head Buckling occurs in the cylindrical portion on the advancing side, which causes the inconvenience that it is difficult to smoothly perform the diameter expansion operation.

[Object of the Invention]

The present invention has been proposed to solve the above-mentioned problems, and when expanding the diameter of the repairing sleeve that press-fits the expanding head into the split sleeve and fits and holds the outer circumference thereof to the required diameter, It is an object of the present invention to provide a repairing device for an underground conduit in which buckling does not occur in the cylindrical portion on the advancing side of the split sleeve and the diameter expanding operation is performed smoothly.

[Constitution of the invention]

In order to achieve this object, the present invention relates to a split sleeve connected to the end surface of the hydraulic cylinder, and an open end of the split sleeve is an enlarged diameter portion for fitting and holding a repair sleeve on the outer periphery. Although a plurality of vertical slits are formed along the axial direction at a relatively small pitch in the circumferential direction to facilitate diameter expansion, the extension that continues to the diameter expansion and reaches the connection with the hydraulic cylinder end surface is In comparison with the expanded diameter portion, the number of the vertical slits formed is reduced and the buckling strength in the cylinder direction is increased.

【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 configured as follows based on the hydraulic cylinder 1 having the piston 2 inside. That is, the hydraulic cylinder 1 has the piston 2 at one end thereof.
A piston rod 21 connected to the piston rod 21 is projected, and an iron ball-shaped expanding head 3 is fastened and fixed to a projecting end of the piston rod 21 with a tightening bolt 31. 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. In the hydraulic cylinder 1, the hydraulic oil is supplied to 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 oil is hydraulic porcelain 16, joint 17
The piston rod 21 is configured to extend by being supplied to the other oil chamber 1b side via the. A split sleeve 5, which can be expanded in diameter, is connected to an end surface 1c of the hydraulic cylinder 1 on the side where the piston rod 21 is projected, via a detachable bolt 11. In the present invention, regarding the structure of the split sleeve 5,
As shown in FIG. 2, the split sleeve 5 is provided with a plurality of slits 51 extending in the cylinder direction in parallel with each other (six in the figure) with a predetermined equal pitch in the circumferential direction. . The vertical slit 51 is opened toward the front end side of the split sleeve 5, the front end side is in a divided form, and the diameter expansion head 3 is press-fitted from the front end open side to facilitate the outward expansion. . In addition, the split sleeve 5 described above
In the cylinder direction,
a, the inner side is an extension portion 5b, and the diameter expansion head 3 can be press-fitted into the extension portion 5b through the inside of the diameter expansion portion 5a by the contraction operation of the piston rod 21, and the extension portion 5b can be advanced. The number of slits 51 in 5b is smaller than that of the expanded diameter portion 51 by half in the illustrated case. On the outer circumference of the split sleeve 5, a short tubular repair sleeve 6 is fitted and held outside the expanded diameter portion 5a. This is to be expanded outside by the split sleeve 5 and attached to the repair partial pipe of the underground pipeline A. Therefore, the repair sleeve 6 is expanded into a thin-walled cylindrical shape as shown in FIG. The inner diameter of the repairing sleeve 6 is formed to have a wall thickness that facilitates the diameter of the split sleeve 5 so that the holding position does not shift inward (the press-fitting direction of the diameter expanding head 3) when the diameter is expanded.
It is locked to the step portion 52 projecting on the outer peripheral surface of the. The repair sleeve 6 is made of a steel pipe, but 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 occurs due to 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 in such a manner that the repair sleeve 6 is blitted to the tube ends of the both broken tubes at the break of the damaged portion Aa according to the result previously observed. Next, in this state, hydraulic oil is introduced into the oil chamber 1a of the hydraulic cylinder 1 via the hydraulic hose 12, the joint 13, and the oil passages 14 and 15 by the hydraulic pump or the like. On the other hand, it moves to the right, and the expanding rod 3 is compressed by the contraction operation of the piston rod 21 so as to be drawn in from the open end side of the split sleeve 5. As a result, the split sleeve 5 with the slit is formed on the taper surface 3a of the expanding head 3.
Further, a diametrical expansion force is generated such that the repairing sleeve 6 fitted thereto is expanded outwardly, and the diametrical expansion force is evenly distributed in the circumferential direction through the split sleeve 5, and the repairing sleeve 6 is It is plastically deformed outward so that the diameter gradually increases from one end and attached to the inner peripheral surface of the conduit A. At this time, according to the present invention, as described above, a plurality of vertical slits 51 extending in the cylinder direction are provided at a relatively small pitch in the enlarged diameter portion 5a of the split sleeve 5 which fits and holds the repair sleeve 6. Since the open end side is a divided cylinder that is divided into a large number, the expanding portion 51 of the split sleeve 5 easily expands to the outside when the expanding head 3 is press-fitted and the expanding operation is easy. Since the number of the slits 51 formed is reduced and the buckling strength of the extension portion 5b of the split sleeve 5 is increased as the press-fitting of the diameter expansion head 3 progresses, the split sleeve 5 is seated. It is possible to accurately expand the diameter of the repair sleeve 6 fitted and held on the outer periphery thereof without causing any bending. As a result of the press-fitting of the expanding head 3, the peripheral surface of the top part
After the passage of 3b, the inner peripheral surface of the repair sleeve 6 is expanded by the top peripheral surface 3b so as to be flush with the inner peripheral surface of the conduit A, and the conduit A itself is also expanded. As shown in FIG. 5, when the expanding head 3 advances into the extension 5b of the split sleeve 5, the repairing sleeve 6 does not project to the inner surface of the conduit A, and the cut point of the damaged portion Aa is cut. A repair sleeve 6 is attached to the inner surface of the pipe so as to close it. The repair sleeve 6 is kept attached to the inner surface of the pipe because the diameter of the repair sleeve 6 is expanded by plastic deformation, but the split sleeve 5 is partially elastically strained (springback).
After the expansion head 3 is advanced, the diameters are successively reduced from the front end open side. Thus, the repair sleeve 6 for the damaged portion Aa of the pipeline A
When the impregnation is completed, 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, whereby the piston 2 is moved leftward and the piston rod 21 extends. Thus, the diameter-expanding head 3 is ejected so as to be extruded toward the front end open side of the split sleeve 5 opposite to the press-fitting direction. By this escape, the split sleeve 5 is separated from the repair sleeve 6 with the repair sleeve 6 left inside the pipe (see FIG. 6). In addition, this escape is the expansion head 3
It is also possible to make it escape as it is while being pulled into the extension portion 5b of the split sleeve 5. After that, the tow rope 4 is wound up to pull the sleeve dilator B forward, or the hydraulic hose 12 is pulled to pull the sleeve dilator B backward, and the used 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, the repair sleeve is expanded in diameter from the inside of the damaged portion of the pipe while being laid. Since the repair is performed so that the damaged portion is attached to the inside of the pipe, the repair can be performed so as to close the cut or the hole. (2) Further, regarding the sleeve expander B for performing the above-mentioned repair, the split sleeve 5 connected to the end surface of the hydraulic cylinder has the enlarged diameter portion 5a on the distal end opening side for fitting and holding the repair sleeve 6 on the outer periphery thereof, A structure having an extension portion 5b continuous to the enlarged diameter portion and reaching the connection portion with the end surface of the hydraulic cylinder, and in particular, the enlarged diameter portion 5a on the tip open side has a vertical slit directed in the cylinder direction.
Since a plurality of 51 are provided at a relatively small pitch and the enlarged diameter portion 5a is a divided circle divided into a large number, the enlarged diameter portion 5a is The diameter expanding operation is easily performed with a structure that easily expands to the outside, and the extension portion 5b continuous with the diameter expanding portion 5a has the slit
Since the number of formed 51 is reduced and the buckling strength is increased as the expansion head 3 is press-fitted, the split sleeve 5 does not buckle and is fitted and held on the outer periphery thereof for repair. The effect that the diameter of the sleeve 6 can be increased appropriately is obtained.

BRIEF DESCRIPTION OF THE 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 pipe, and FIG. 2 is a sectional view of a split sleeve in the sleeve expander. The side view and the half-end view shown in FIG. 3, FIG. 3 is the side view and the half-end view partially showing the repair sleeve, and FIG. 4 is an explanatory view showing the state before the diameter expansion of the repair sleeve. FIG. 6 is an explanatory view showing a state during expansion of the diameter of the repair sleeve, and FIG. 6 is an explanatory view of a state in which the diameter expansion head is pushed out after completion of the expansion of the diameter of the repair sleeve. 1 ... Hydraulic cylinder, 2 ... Piston, 21 ... Piston rod, 3 ... Expanding head, 4 ... Traction rope, 5 ... Split sleeve, 51 ... Vertical slit, 52 ... Transverse groove, 6 ... Repair sleeve, 11 ... Attachment / detachment Bolts, 12, 16 ... Hydraulic hoses, 13, 17 ... Joints, A ... Underground pipelines, 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. A sleeve for expansion is constructed by fitting a retaining sleeve on the outer periphery of the piston and holding a diameter-expanding head that is press-fitted into the split sleeve on the piston rod, and is damaged in the circumferential direction. By operating the above-mentioned dilator at a location, the expansion head is press-fitted into the split sleeve to expand the split sleeve and the repair sleeve so that the repair sleeve is attached to the inner surface of the damaged portion of the pipe. The split sleeve connected to the end surface of the hydraulic cylinder has an enlarged diameter portion for fitting and holding the repair sleeve on the front end open side. An extension portion is formed continuously from the enlarged diameter portion to reach the connection portion with the end surface of the hydraulic cylinder, and the enlarged diameter portion is formed with a plurality of vertical slits along the axial direction at a relatively small pitch in the circumferential direction. On the other hand, the underground pipeline repairing device is characterized in that the number of vertical slits formed in the extension is reduced to increase the buckling strength in the cylinder direction.