JPS6182092A - Method of repair construction of underground duct - 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 that serve as lead-in conduits for telecommunication cables, etc. laid underground. Specifically, the present invention relates to a repair method for underground conduits that serve as lead-in conduits for telecommunications cables, etc. Specifically, the pipe body is damaged in the circumferential direction due to breakage due to aging after installation. This invention relates to a method for repairing underground conduits, in which defective conduits, where cables cannot be led through due to problems such as the above, are corrected to a conductive state while remaining buried, and then the damage is repaired.

[Conventional technology] This type of underground conduit is usually laid underground, such as under a road, with multiple pipe bodies passing between manholes and arranged in multiple stages vertically and in multiple rows horizontally. During the initial installation, extra conduits that are expected to be added in the future are laid at the same time, and the cables to be routed are drawn into any empty conduit and laid. ing. rTechnical problem of the invention]

By the way, over time after the death of T5, the pipe body may bend due to loosening of the ground or vibration, or may become uneven due to breakage.
When installing a new cable into an empty underground conduit,
There were inconveniences such as the cable not being able to be pulled in. (Objective of the Invention 1) The present invention was proposed to solve the above-mentioned disadvantages.
The inside of the underground pipeline is diagnosed using a pipe camera, etc., and a cylinder device equipped with a propulsion head is forcibly inserted into the pipeline where there is an uneven level due to broken straw, etc., which is preventing insertion. After that, a hydraulic expander is inserted into the corrected position and activated to expand the diameter of the repair sleeve and press it against the inner surface of the pipe, repairing the circumferentially damaged pipe line so that it can be retracted. This paper attempts to provide a method for repairing underground pipes. (Structure of the Invention) For this purpose, the present invention provides a hydraulic cylinder equipped with a cylindrical member with an expandable slit that holds a repair sleeve on the outer periphery of its tip, and a cone-shaped iron ball that is press-fitted into the cylindrical member. A hydraulic expander consisting of a pig and a piston fixed to the tip of a piston rod is inserted into the underground pipeline where damage has occurred in the circumferential direction, and the above hydraulic expander is inserted into the underground pipe where damage has occurred. By activating the expander, the iron ball pig is inserted into the cylindrical member through a slitted ring made of a low-friction material fitted to the inner periphery of the cylindrical member and a coiled ring that distributes pressing force in the circumferential direction. The present invention is characterized in that the diameter of the repair sleeve is enlarged to be at the same level as the inner circumferential surface of the pipe to repair a damaged pipe.

【Example】

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings. As shown in FIG. 1, the hydraulic expander used here has a cone-shaped iron ball pig 3 fixed to the tip of a piston rod 2 that passes through a hydraulic cylinder 1 and is supported, and an eye bolt 4. A traction wire 5 is connected therebetween. At the forward end of the hydraulic cylinder 1, as shown in FIG. A slitted cylindrical member 6 having axial slits 6a cut at several locations, for example, 61 Im, is attached to the cone-shaped iron ball pig 3 with a length extending to the rear end. On the outer peripheral surface of this slitted cylindrical member 6, a third
As shown in the figure, a thin-walled cylindrical repair sleeve 1 that can be expanded in diameter is fitted and held, and the pressing force generated by pulling in the iron ball pig 3 is applied evenly in the circumferential direction on the inner peripheral surface. distribute. A coiled ring 8, as shown in FIG. In order to allow the cone-shaped iron ball pig 3 to be drawn smoothly into the slitted cylindrical member 6 on its inner peripheral surface, shafts are provided at multiple locations in the circumferential direction, for example, at four locations, as shown in FIG. A slit (=
i-milling is installed inside. The hydraulic cylinder 1 also includes a hydraulic hose 11. Joint 12. Pressure oil supplied through the oil passage 2a provided in the piston rod 2 and the oil passage tOa of the piston 10 is introduced into either one of the oil chambers formed on both sides of the piston 10, and the pressure oil is introduced into one of the oil chambers formed on both sides of the piston 10. The hydraulic oil is
The oil is configured to be discharged from the oil passage. Next, the operation of the hydraulic dilator configured as described above will be explained. First, a vibrator camera etc. was inserted between the two manholes, which is a section of underground passageway A that requires repair.
Observe any unevenness caused by breakage, etc., and confirm its position. As soon as this [j ends, 7
After forcibly inserting the cylinder device equipped with the propulsion head through the manhole j and correcting the uneven part etc. to the inserted state,
Insert the traction wire 5 into the conduit A, pull it out from the other manhole, and wind it up with a winch or the like, as shown in FIG.
The hydraulic expander holding the repair sleeve 1 is moved to a position where the repair sleeve 7 comes into contact with the damaged location Aa of the pipeline Δ and is stopped. Next, pressure oil is supplied to the hydraulic hose 11 by a hydraulic pump or the like. Joint 12. Oil passage 2a of piston rod 2. When introduced into the oil chamber 1a of the hydraulic cylinder 1 through the oil passage 10a of the piston 10, the piston 10 moves to the right with respect to the hydraulic cylinder 1, and the cone-shaped iron ball pig 4 is introduced into the oil chamber 1a of the hydraulic cylinder 1 through the piston rod 2. The slit is smoothly press-fitted by the slit ring 9 so as to be pulled into the cylindrical member G, and the circular 111 surface 3a generates a pressing force that expands the diameter of the repair sleeve 7, and the pushing force is applied to the coil. As shown in FIG. By pressing against the circumferential surface, the inner circumferential surface of the repair sleeve 7 is flush with the inner circumferential surface of the conduit A by the top cylindrical surface 3b, and the diameter of the conduit A is also expanded, as shown in FIG. As shown, the diameter-expanded repair sleeve γ corrects the conduit A, where the loss-making area Aa has occurred, to a state where the diameter-enlarged repair sleeve 7 does not obstruct the insertion of the cable. . When this correction is completed, the pressure oil is transferred to the hydraulic hose 13. The piston 10 is introduced into the oil chamber 1b of the hydraulic cylinder 1 through the joint 14, and the piston 10 is moved to the left to push the cone-shaped iron ball pig 3 out of the cylindrical member 6. Member 6. Coiled ring8. As shown in FIG. 9, the diameter of the ring 9 with slits is reduced due to some residual elastic strain, and by winding the traction wire 5 again with a winch or the like, the hydraulic expander can be easily inserted into the other manhole. can be withdrawn. The conduit A corrected in this way has a concave portion on the inner circumferential surface between the curved portion that has been deformed and expanded in diameter and the repair sleeve 7, so this concave portion is smoothed out. , the resin lining pig 15 is inserted into the pipe A from one manhole.
lining resin is injected into the front surface of the pipe, and as shown in FIG. The lining layer P' of a predetermined thickness is formed on the inner peripheral surface of the pipe A and the repair sleeve 7, and the inner surface of the pipe is smoothed.
This allows the cable to be inserted extremely easily. Furthermore, the formed resin lining layer P- fixes the repair sleeve 7 to the inner circumferential surface of the conduit A, and permanently maintains the damaged area in a corrected state. Effects of the Invention 1 As described in detail above, the present invention corrects the ground F pipe in which the difference in level has occurred due to breakage etc. to the inserted state, and then passes the hydraulic expander holding the repair sleeve through the pipe, The repair sleeve is actuated at a location where the f1 bolt etc. occurs in the circumferential direction to expand the diameter of the repair sleeve and press it to cover the damaged location, so if a defective location such as breakage occurs. , the cable can be repaired while it is still buried, making subsequent cable pulling work easier.

[Brief explanation of the drawings] Figure 1 is an overall view of the hydraulic dilator, Figure 2 is a cylindrical member with slits, Figure 3 is a repair sleeve, Figure 4 is a coiled ring, and Figure 5 is a slit. Figure 6 shows the state of the repair sleeve before its diameter has been enlarged, Figure 7 shows the state in which the iron ball pig is extruded, and Part I shows a conceptual diagram of resin filling. 1... Hydraulic cylinder, 2... Piston rod, 3...
- Cone-shaped iron ball pig, 4... Eye bolt, 5...
Towing wire 1), 6...Cylindrical member with slit, 7...
・Repair sleeve, 8... Coiled ring, 9...
Ring with slit, 10... Piston, 11.13.
...Hydraulic hose, 12°14...Joint, 15...Pig for resin filling, 16...Wire for traction, A...Pipeline, Aa...Damaged area, P...For filling Resin, P"...
・Resin lining layer. Patent Applicant Hakko Co., Ltd. Agent Patent Attorney Nobu Kobashi Ukasa Patent Attorney Susumu Murai Figure 3 Figure 4 Figure 5 WII 6 Figure 8 Figure 9 Procedure Amendment (Voluntary) January 25, 1985 Japan Patent Office Commissioner Gakudon Shibuseki1, Indication of the case Patent Application No. 205364 of 19822, Name of the invention Method for repairing underground pipelines3, Relationship with the amended person case Patent Applicant Tokyo 1-10-6-4, Takaban, Meguro-ku, Agent 5, The Burning Era of the Amendment (1) Full Text of the Meizaku Zan (2nd C;) Plan 6, Contents of the Amendment (1) The entire text of the specification has been amended as shown in the attached sheet. do. (2) Amend the drawing plan as shown in the attached sheet. (Amendment) Description 1, Title of the invention, Method for repairing underground pipes 2, Claims: A hydraulic cylinder with a piston inside, and a hydraulic cylinder connected to the piston, installed in an underground pipe that is damaged in the circumferential direction. and a piston rod protruding from one end of the hydraulic cylinder,
Connect a split sleeve that can be expanded in diameter to the end face of the hydraulic cylinder on the side from which the piston rod protrudes, and attach it to its outer periphery? 10
Insert the sleeve expander, which is constructed by attaching the μ sleeve to the TiX joint and attaching the expanded diameter head that is press-fitted into the split sleeve to the piston rod, and expand it in the circumferential direction.
By operating the expander at the location where the problem is occurring, the enlarged diameter head is press-fitted into the split sleeve, and the repair sleeve, which is fitted and held on the outer periphery via the split sleeve, is approximately flush with the inside of the boat. A method for repairing underground pipelines, characterized in that the repair sleeve is attached to the inner surface of the pipeline at one point of loss by expanding the diameter of the pipeline at different levels. 3. Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a method for repairing underground conduits, such as those installed underground to lead in telecommunication cables, for example.
More specifically, the diameter of the sleeve for use with ILI (from the inside of the pipe as it is) is expanded and attached to the damaged part of the underground pipe that is broken or has a hole, and the jf11m section is cut 7. This relates to the water replenishment method for underground pipes that connect I+IiB. (Problem to be solved by the invention 1. For example, the underground conduit for the above-mentioned telecommunication cables is
Normally, multiple pipes with a diameter of 7 to 15 mm are laid underground under a passageway, etc., so that when the first installation is carried out, extra pieces that are expected to be installed in the future are laid. Empty conduits are laid at the same time, and cables to be routed are then drawn into any of the empty conduits. By the way, in the year after installation, underground pipes like this are prone to bending or breaking due to changes in the ground or the load of heavy vehicles passing on the road, resulting in uneven levels. This causes an inconvenience in that it becomes a defective empty conduit, which hinders the installation of new cables. In order to repair such defective pipes, conventional methods have been used, such as straightening the broken pipe in a straight line by passing a pipe straightening device inside the underground pipe, or enlarging the diameter of the dented part. However, if the pipe is broken or has a hole, it is not possible to repair the break or hole by just straightening the pipe as described above, and the damaged part cannot be completely repaired. It wasn't. (Objective of the Invention) The present invention has been proposed to solve the above-mentioned problems, and therefore, after the pipe is straightened, a repair method is applied from inside the pipe to the damaged part of the underground pipe where there are creases and holes. It is an object of the present invention to provide a method for repairing an underground encapsulant that can be repaired by attaching a sleeve to cover the 10 damaged parts. [Structure of the Invention] In order to achieve this object, the present invention Ifil in the circumferential direction
In the underground conduit where the piston is functioning, there is a hydraulic cylinder with a piston inside, and a screw 1-rod connected to the piston and protruding from one end of the hydraulic cylinder, and the hydraulic pressure on the side from which the piston rod protrudes is provided. A sleeve configured by connecting a diameter-expandable split sleeve to the cylinder end face, holding a repair sleeve on its outer periphery, and attaching a diameter-expanding head that press-fits into the vJ sleeve to the above-mentioned string rod. By applying the expander and operating the expander at a location where damage is likely to occur in the circumferential direction, the expanded diameter head is press-fitted into the split sleeve and applied to the outer periphery through the split sleeve. 1) Expand the diameter of the repair sleeve to be held together so that it is approximately at the same level as the inner peripheral surface of the pipe, and then apply the above repair sleeve to the inner surface of the pipe in the damaged area. It is characterized by the ability to repair. (Embodiment) Hereinafter, an embodiment of the present invention will be explained with reference to the accompanying drawings. Fig. 1 shows the expansion of the sleeve of the present invention into the underground passageway A where the fold N is 1. The above-mentioned sleeve expander B is constructed as follows based on the hydraulic cylinder 1 having a piston 2 installed therein. That is, the hydraulic cylinder 1 has a piston rod 21 protruding from one end that is connected to the piston 2, and an i''AA ball-shaped enlarged diameter head 3 is attached to the protruding end of the piston rod 21 for tightening the tightening bolt. 31. A traction loaf 4 is connected to the front end of the diameter-expanding head 3, and by pulling this, the sleeve dilator B can be moved along the inside of the canal. In the hydraulic cylinder 1, the piston rod 21 contracts when hydraulic oil is supplied into the oil chamber 1a on one side of the piston 2 through the hydraulic hose 12, the handle 13, and the oil passage 14.15. By supplying hydraulic oil to the other oil chamber 11) through the hydraulic port 1G and the joint 17, the piston rod 21
is configured to perform an expansion operation. Connected to the end 1c of the hydraulic cylinder 1 on the side from which the piston rod 21 is protruded is a 'V'' 11 sleeve 5 whose diameter can be expanded by removing the bolt 11. The sleeve 5 extends in the cylindrical direction as shown in FIG. Set in Mo11
, and this slit 51 is J2j sleeve 5
It is opened by pushing toward the tip side, and the tip side takes on the shape of 1, and the child head 3 press-fits the 1i6 mark from the tip side of Ua, making it easy to spread outward. 15 has an enlarged diameter section 5a on the open end side in the direction thereof, and an extension section 5b on the inner side, so that the enlarged diameter head 3 passes through the enlarged diameter section 5a due to the contraction vJ of the piston rod 21. A short tubular sleeve 6 is fitted and held on the outer periphery of the sleeve 5 so that it can be press-fitted into the extension part 5b. This is expanded in diameter to the outside by the repair sleeve 5 and inserted into the repair part cylinder of the underground pipe A, so that the repair sleeve 6 is expanded in diameter to the outside as shown in FIG. It is localized and has a wall thickness that allows easy diameter expansion, and the holding position is inward (in the press-fitting direction of the diameter expansion head 3) when the diameter is expanded.
The inner end of the replenishing sleeve C is connected to a stepped portion 52 projecting from the outer periphery of the 2i+1 sleeve 5 so as to prevent this from occurring. The repair sleeve 6 may be made of steel vibrator, or may be made of a material whose diameter can be easily expanded. The inner periphery of the vJ sleeve 5 includes a coiled ring 7 as shown in FIG. 4, and a slitted ring 8 as shown in FIG. 5 on the inner periphery thereof. be done. Both the coiled ring 7 and the slit N-shaped ring 8 are subjected to a test to ensure a required diameter expansion dimension when the diameter expansion head 3 is press-fitted. In other words, if the wall thickness of the split sleeve 5 is made thicker than the required thickness, the diameter expansion operation will be inhibited, so this cannot be done as necessary.
and a slitted ring 8 are introduced on the inner circumferential side of the 'b'J sleeve 5, but these coiled rings 7 and slitted rings 8 are made by devising the form of the split sleeve 5 so that they can fit around the specified circumference. If the shape is such that the diameter can be easily expanded while having a wall thickness that secures the expander size of , the coiled ring 7 and the slitted 8 ring 8 may be omitted. Next, we will explain the usage example and operation of the sleeve expander B, which is configured like a corrugator. Insert it into the underground conduit Δ and observe the damage condition, and
If an uneven condition occurs due to a member, a known straightening device should be inserted into the conduit in advance to correct the uneven condition. After the second winter, the underground pipe △ is opened from one manhole side.
The sleeve expander B of the present invention is introduced into the inside of the canal, and the sleeve expander B is moved along the inside of the canal by pulling the middle loaf '4 from the 7th hole side of the external force, and the H-1 wound is Place J-7 at the location △a where △a is occurring and create a movement. At this stop, l + (I) will be damaged due to the expected outcome
The repair sleeves are positioned so as to bridge the cut a. Next, in this state, the operation a1j is operated by a hydraulic pump or the like at 11
1 pressure hose 12. Joint 13. 9 people are placed in the oil chamber 1a of the hydraulic cylinder 1 via the oil passages 14 and 15. As a result, the piston 2 moves in the opposite direction with respect to the hydraulic cylinder 1, and the contraction movement f of the screws L and rods 21 The enlarged diameter head 3 is press-fitted into the slitted ring 8 so as to be pulled in from the open end side of the vj sleeve 5 using a screwdriver. As a result, on the tapered surface 3a of the expanded diameter head 3, the split sleeve 5 with slits, Jj, and i+
A pressing force is generated that pushes the Ia-3 sleeve 6 outward, and this pressing force is caused by the coiled spring 7.
It is evenly distributed in the circumferential direction via the 2nJ sleeve 5, and the repair sleeve 6 is attached to the inner circumferential surface of the iris △ while gradually expanding from one end to the vertical side while avoiding plastic deformation. At this time, the diameter-expanding head 3 is press-fitted (by 1, the inner circumferential surface of the sleeve G for 3 is expanded by 4f on the same surface as the inner circumferential surface of the conduit A). diameter, and further pipe A
The diameter of the split sleeve 5 is also expanded, and the diameter-expanding head 3 advances into the extension portion 5b of the split sleeve 5. In this 1)8 case, as shown in FIG.
That j! is not prominent! '1 A repair sleeve 6 is attached to the inner surface of the pipe so as to close the cut at the damaged location △a.
A5, repair sleeve 6, this is ll1I! IJl
The inner surface of γτ remains opaque due to being deformed and expanded in diameter, but on the other hand, the split sleeve 5. -] Ile 1 ring 733 and slit (J ring 8 has some residual elastic strain (springback) in itself, so it expands (￥ After the advance 11 of head 3, these (, ↓) ~ is successively reduced in diameter and separated from the repair sleeve 6. When the repair sleeve G is attached to the damaged portion Δa described above, pressurized oil is then supplied through the hydraulic hose 16 and the joint 17. By injecting oil into the other oil y1b of the hydraulic cylinder 1,
Since the piston 2 moves to the left and the piston rod 21 extends, the diameter-expanding head 3 is pushed out from the extension portion 5b side of the split sleeve 5 toward the open end side, opposite to the press-fitting direction. It will be escaped like that. During this escape, +fr
As described above, the repair sleeve 6 whose diameter has been expanded by plastic deformation is replaced with the sleeve 5. Coiled ring 1. The slit ring 8 is reduced in diameter due to some residual elastic strain in itself, and is completely peeled off from the inspection sleeve G as shown in FIG. ε1, rip off the leather rope 11 and expand the sleeve 3B
1) Pull it out in the 1j direction, or use the hydraulic pressure
After pulling 2 and pulling out the sleeve dilator B @ backwards,
6 Remove the used split sleeve 5 with the bolt removal 11,
Here, take a new split sleeve 5 again (-J and then the next one? +
This is something that will spread widely. The pipe line △ repaired in this way is repaired by the repair sleeve 6
Since a recess is formed on the inner circumferential surface of the repaired part to which the lining has been applied, in order to form a resin lining layer to eliminate this recess, the lining pig 18 is inserted from one manhole as shown in FIG. Wire 1 is inserted into the snowy road A, and the lining resin P is injected into the front surface of the wire 1.
9, the resin P is pressed against the inner circumferential surface of the tube by the conical surface of the tip of the pig 18, filling the recessed part.
A lining @Pa of a predetermined thickness is formed on the inner peripheral surface of each of the channel A and the repair sleeve 6 to make the inner surface smoother and to facilitate the insertion of the cable. Furthermore, the formed resin lining MtPa is fixed to the inner circumferential surface of the reparative three IG (Y pipe A), and permanently maintains the corrected state of the damaged place. Effect 1 Since the present invention is a repair work as explained above, the following effects are obtained. (1) First, according to the present invention, underground pipes with salt loss such as fold IQ vJ holes can be repaired. When repairing the pipe, attach a sleeve for i [95 with a diameter of 1 wider than the inside of the pipe while it is still installed to the fair-skinned part of the pipe.Since it will be covered over the upper part of the pipe, make sure not to cut any cuts or holes. (2) According to the present invention, the progress of press-fitting of the diameter-expanding head By expanding the diameter of the repair sleeve outward, the inner circumferential surface of the repair sleeve is enlarged and affixed so that it is the same as the inner circumferential surface of the conduit, so the inner circumferential surface of the conduit is ?+li
The sleeve for tX can be attached without protruding, and repairs can be made without narrowing the inner diameter of the leakage path. 4. Brief description of the drawings Figure 1 is an overall view of a sleeve dilator according to an embodiment of the present invention introduced into an underground tract, and Figure 2 is a diagram showing a sleeve dilator with a split sleeve of 33 mm inserted into the sleeve dilator. A side view and a half end view partially shown in cross section, FIG. 3 is a side view and half end view partially shown in cross section of the sleeve for hnp, and FIG. 4 is a side view partially shown in cross section of the coiled ring. Fig. 5 is a partially sectional side view and a partially cutaway side view of the ring with slits, Fig. 6 is an explanatory drawing of 7I showing the condition before diameter expansion of the replenishing sleeve, and Fig. 7 is an explanatory view of the supplementary 9x of the same.
Fig. 8 is an explanatory diagram showing the state in which the diameter of the repair sleeve is being expanded. Fig. 8 is an explanatory diagram of the state in which the 1 mm diameter head is extruded after the repair sleeve has been expanded. Fig. 9 is an explanatory diagram showing the state in which the repair sleeve is being expanded. It is a conceptual diagram. 1... Hydraulic cylinder, 2... Piston, 21...
Piston rod, 3... Expanded diameter head, 4... Traction rope, 5... i! , Ij sleeve, 6... Repair sleeve, 7... Coiled ring, 8... Ring with slit, 11... 6 Bolt removal, 12.1 ('i...
Hydraulic hose, 13.17... Fitting, A... Underground pipe, Aa... Loss IrA location, P... Filling resin, pa
...1541 No finger lining. Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] It consists of a hydraulic cylinder equipped with a cylindrical member with an expandable slit that holds a repair sleeve on the outer periphery of the tip, and a piston that fixes a cone-shaped iron ball pig to the tip of the piston rod, which is press-fitted into the cylindrical member. Insert the hydraulic expander into the underground pipeline where damage has occurred in the circumferential direction, operate the hydraulic expander at the location where the damage has occurred, and fit it to the inner periphery of the cylindrical member. The iron ball pig is drawn into the cylindrical member through a slitted ring made of a low-friction material and a coiled ring that distributes pressing force in the circumferential direction, and the repair sleeve is aligned with the inner peripheral surface of the pipe. A method for repairing underground pipes, which is characterized by expanding the diameter so that the pipes are level and repairing damaged pipes.