JPH11270774A - Repairing member for part of pipeline - Google Patents

Abstract

PROBLEM TO BE SOLVED: To repair stepped seam part of an existing sewerage pipeline or the like, effectively. SOLUTION: The pipeline-part repairing member comprises a flexible base sleeve 1 that is rolled into a cylinder with both circumferential ends overlapped for relative sliding movement enlarging the diameter and that is provided at the overlap part with a locking means for allowing such sliding movement of both overlapped ends as increasing the diameter but checking that as reducing it, and an elastic sleeve that is adapted to be fitted on the periphery of the base sleeve 1 and is formed at each end with an annular elastic water-stop tongue protruding from its periphery above the other areas. The flexible base sleeve 1 is formed at its axial middle with a constriction 1m of a reduced outside diameter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a member for repairing the inner surface of a pipe buried for water supply, sewage, gas, electric wire, telephone line and the like.

[0002]

2. Description of the Related Art For example, fume pipes, porcelain pipes and the like are widely used as sewer pipes buried in the ground. The pipe is eroded and deteriorated by a kimono or the like, and the pipe thickness is reduced to decrease the strength. In addition, seams of pipes may shift due to ground pressure or land subsidence, creating gaps, cracks may occur in some of the pipelines due to overload, etc., and groundwater etc. may enter the pipelines from these parts, or Running water flowing in the road may leak into the ground. There is a risk that earth and sand around the pipe will flow out due to the intrusion of the groundwater or the like into the pipe or water leakage, and a cavity will be formed on the back face of the pipe, causing road surface collapse or the like.

[0003] In order to cope with such a problem, a repair member as shown in the figure has been conventionally proposed as a device for partially repairing the inner surface of a pipeline. The member for partial repair is a stainless steel sleeve S as shown in FIG.
And a rubber sleeve G as shown in FIG. The stainless steel sleeve S is formed by rolling a thin plate material into a cylindrical shape, and has both ends overlapped. In the overlapped portion, the inner peripheral surface of the outer peripheral portion is provided with a plurality of aligned projections formed by, for example, cut-and-raised, while the inner peripheral portion is formed in the same manner as the above-described projections. Provided openings are provided. Projections reaching positions opposing the openings are engaged one-to-one with these openings, and even when these projections and the openings are in the engaged state, a cylindrical stainless steel sleeve is formed. When the diameter expansion operation is performed, the engagement state is automatically released in accordance with the diameter expansion operation, and the outer peripheral side portion and the inner peripheral side portion are allowed to slide with respect to each other in the circumferential direction. When the stainless steel sleeve performs the diameter reducing operation, the projections that have come into engagement with the openings engage with the edges of the openings, and the outer circumferential side and the inner circumferential side of the above-described circumferential direction of the two portions of each other. The sliding movement is prevented.

The rubber sleeve G has a cylindrical shape fitted to the outside of the stainless steel sleeve S, and a plurality of connecting sections having a mountain cross section are provided near the outer peripheral end of the rubber sleeve G. An elastic water stopping portion is formed which is formed of an annular ridge.

In order to carry out a repair work using the above repair member, a repair member consisting of a stainless steel sleeve S and a rubber sleeve G fitted thereon is run in a pipeline while holding the repair member. In addition, it is attached to a device called a fitting machine that can expand the diameter of the repair member, and is transported through the pipeline, where cracks occur in the pipeline and gaps and steps in the seam of the pipeline. Is brought to the joint or other required repair location where the fitting machine is operated to expand the diameter of the repairing member.When the expansion is no longer possible, the fitting machine is stopped and contracted. Then, the elastic water-stopping portion, which is compressed and deformed between the inner surface of the pipe and the stainless steel sleeve S and brings about an elastic repulsion between the two, attempts to reduce the diameter of the stainless steel sleeve S, thereby reducing the diameter of the stainless steel sleeve S. Side parts slide in the circumferential direction with each other However, at this time, the projection and the opening closest to each other in the sliding movement direction are engaged with each other to prevent the diameter of the stainless steel sleeve S from being reduced, so that the repairing member is firmly attached to the required repair location on the inner surface of the pipeline. Will be installed.

[0006] As a result, the water that intrudes into or leaks from the crack or the gap between the pipeline joints is caused by the action of the elastic water blocking portion compressed between the inner surface of the pipeline and the stainless steel sleeve S. Since the flow is blocked, an effective repair effect is obtained.

[0007]

However, when the above-mentioned repairing member repairs a stepped portion formed at a pipe joint, when the stepped portion is relatively small, the above-mentioned repairing effect is sufficiently brought about. When it becomes somewhat large, the inner peripheral edge of the pipe end at the joint portion hits the outer peripheral surface of the repair member in the middle of the diameter expansion, hinders the sufficient diameter expansion of the repair member, and the engagement between the projection and the opening becomes insufficient, Alternatively, since the diameter expansion is not performed in a well-balanced manner and the engagement between the projection and the opening is performed stepwise on the left and right, an elastic water blocking portion is provided between the inner surface of the pipeline and the stainless steel sleeve. There is a problem that it does not reach a state in which it is in full contact with the inner surface, and a sufficient repair effect cannot be obtained.

As a countermeasure for such a case where the joint has a relatively large step, a partial repair method using glass fiber and a curable resin has been conventionally proposed. In this method, an uncured resin is impregnated. The glass fiber mat is applied to the inner peripheral surface of the pipeline so as to cover the seam with a device called a packer, thereby closing the seam having a step, and applying heat, for example, to cure the resin from the packer to perform repair. Things. However, in this method, only the repaired part is hardened and the strength increases, the strength of the pipe around the repaired part relatively decreases, and new cracks occur around the repaired part due to external force applied to the pipe There is. In addition, since the surface shape of the repaired part formed by this repair method follows the step, a step is formed in the repaired part, and depending on the condition of the step and the flow situation, the smooth flow of water is hindered. May be.

Accordingly, an object of the present invention is to improve the repairing member comprising the above-mentioned two sleeves so that the water stopping effect can be sufficiently exerted even at a joint having a relatively large step. In order to be able to perform repairs, it is further configured such that a step portion that inhibits the flow of water is not formed in the pipeline after the repair.

[0010]

In order to solve the above-mentioned problems, the invention according to the first aspect of the present invention is arranged such that both ends in the circumferential direction are overlapped, and the diameter can be expanded while sliding the overlapping portions mutually. When engaged with each other in a cylindrical shape and further overlapping parts, the sliding of both parts in the diameter increasing direction is allowed, but the sliding of both parts in the diameter reducing direction is prevented. A base sleeve provided with a means, and an elastic sleeve capable of being fitted and mounted on the outer peripheral surface of the base sleeve, and having an elastic water blocking portion protruding from the outer peripheral surface from other portions near both ends. In the pipe portion repairing member having the above, the base sleeve has a portion in which the outer diameter is reduced at a central portion in the axial direction.

Therefore, according to the present invention, when repairing a pipe joint having a relatively large step, when expanding the diameter of the repairing member, the central portion having a reduced outer diameter is the inner peripheral edge of the pipe end of the joint. Since the part can escape, the diameter of the repairing member can be sufficiently expanded until the elastic water-stopping part is pressed against and tightly adhered to the inner peripheral surface of the pipeline, so that the water is reliably stopped at the stepped joint part. Repairs can be made in the condition. In addition, in the state after the repair, the stepped portion is not formed in the repaired portion, so that the water can smoothly flow down.

In addition, even if external force is applied to the pipeline after the repair,
Since the repair member is composed of the flexible base sleeve and the elastic sleeve, it is less likely to generate a new crack around the repaired portion following the change in the pipeline.

By providing flanges extending outward in the axial direction at both ends in the axial direction of the base sleeve (claim 2), at the side edge of the repairing member after installation,
A gentle slope that is smoothly connected to the inner surface of the pipe is formed, so that the flow of water at the side edge of the repair member can be smoothly performed.

[0014]

FIG. 1 is a longitudinal sectional view of a flexible base sleeve 1 which is a component of a repair member according to an embodiment of the present invention. This base sleeve is as shown in FIG. As shown in FIG. 3, a vertically long flat plate material is wound into a cylindrical shape and processed.

As shown in FIG. 2, the base sleeve is provided with a plurality of claws 1a formed by cutting and raising at one end thereof, which are aligned vertically and horizontally. As shown in FIG. 3, the plate material of FIG. 2 is wound into a cylindrical shape. At this time, both ends are overlapped with each other, and the claws 1a are arranged on the inner peripheral side as shown in FIG.
The tip edge 1b of the inner peripheral end is engaged with the claw, and thus the claw 1a and the tip edge 1b constitute locking means. When the claw 1a is inclined and both ends on the inner peripheral side and the outer peripheral side overlapping with each other slide with each other such that the cylindrical base sleeve expands in diameter, even when the claw 1a is engaged with the tip edge 1b. Is disengaged from the engagement state, and this diameter expansion is allowed, but mutual sliding of both ends in such a direction as to reduce the diameter of the cylindrical base sleeve is prevented. 1c in FIG.
Is an elongated opening formed at the end of the plate-shaped material on which the claw 1a is not provided, and the claw 1a in the overlapping range of the both ends enters the opening. The shape and dimensions are determined so that they can be performed. In the figure, reference numeral 1d denotes a reinforcing rib composed of a projection formed between the opening 1c and the front edge 1b.

The above-mentioned locking means can be constructed in the form shown in FIGS. 4 to 6 in addition to those shown in FIGS. The locking means shown in FIG. 4 is a claw 1e which is formed side by side by cutting and raising the inner peripheral end.
And a plurality of claw fitting openings 1f formed in the circumferential direction at the outer peripheral end in the same lateral arrangement as these claws. As shown in FIG. 4B, the claw 1e and the claw fitting openings 1f are formed. One direction between the inner peripheral end and the outer peripheral end overlapping each other when engaged with each other (direction in which the diameter of the base sleeve is increased)
The sliding movement in the other direction is allowed, but the sliding movement in the other direction (the direction in which the diameter of the base sleeve is reduced) is prevented.

The locking means shown in FIG. 5 is formed by a lateral groove 1g formed by bending the outer peripheral end and an edge 1h of the inner peripheral end. 1h is horizontal groove 1g
, Only sliding movement in one direction between the inner peripheral end and the outer peripheral end is permitted. The locking means shown in FIG. 6 includes a plurality of cut-and-raised claws 1i (FIGS. 6 (A) and 6 (B)) formed side by side on the inner peripheral surface of the outer peripheral end and an inner peripheral end. 6 (a) and 6 (c), which are formed in the outer peripheral surface in the same manner as these claws 1i in a side-by-side arrangement and several rows in the circumferential direction.
(C)). FIG. 6 (D) is the same as FIG.
In this case, the hole 1j is replaced with a nail 1k. Nail 1
The i and the hole 1j, and the claw 1i and the claw 1k cooperate to perform the same operation as the other locking means.

As shown in FIG. 1, a cylindrical base sleeve 1 is provided.
Has a portion 1m with a reduced diameter formed stepwise with respect to other portions at the center. This reduced diameter part 1m is shown in FIG.
As shown in FIG. 7, the connection may be made to a portion whose diameter gradually increases toward the end of the sleeve.

The base sleeve 1 has, at both ends thereof, flanges 1p extending outward. The flanges smooth the flow at the end of the sleeve when the base sleeve is installed in a pipe. Bring.

The base sleeve 1 can be made of a metal material having excellent corrosion resistance such as stainless steel, a synthetic resin, a shape memory alloy or a shape memory synthetic resin. When stainless steel is used, the result is that the fluid easily flows at the portion where the base sleeve is installed.

FIG. 8 shows a part of a longitudinal section of the elastic sleeve 2 which can be fitted on the outer peripheral surface of the base sleeve 1. The sleeve can be made of various elastic materials, but is preferably made of rubber. The elastic sleeve 2 has an elastic water-stop portion 2a protruding from the outer peripheral surface near both ends thereof. This water-stop portion is basically formed as shown in FIG.
An annular ridge 2a-1 having a mountain-shaped cross section and an annular ridge 2a-2 having a higher mountain shape and made of water-expandable rubber are provided.

When a repair member is attached to a seam having a large step, a large space is formed on the back surface. The structure of the elastic water stopping portion 2a for improving the water stopping ability in such a state is shown in FIG. B) to FIG. 8 (G). FIG. 8 (B)
In this case, the rubber thickness of the base portion in the elastic water-stop portion is thicker than the other portions, and an annular ridge 2a-1 and an annular ridge 2a-2 made of water-swelling rubber are provided on the outer peripheral surface of the base portion 2a-3. It is provided. FIG. 8C shows a form in which an elastic material 2a-4 such as a sponge is embedded in the above-mentioned base portion 2a-3 to make it bulky.

In FIG. 8D, the configuration of the annular ridge 2a-1 is normal, but the height of the annular ridge 2a-2 made of water-expandable rubber provided therebetween is high. In the elastic water blocking portion shown in FIG. 8 (E), the raised base portion is made hollow, and the hollow chamber 2a is formed.
Air, water, or a viscous substance is sealed in the inside of -5. FIG. 8 (F) shows that a sponge-like substance 2a-7 is arranged between the left and right water stopping portions in addition to the elastic water stopping portion.
This sponge-like substance may be impregnated with a curable resin in some cases. FIG. 8 (G) shows a mode in which an elastic material 2a-6 made of rubber, sponge, or the like, which is formed in a ring shape or in a ring shape, is arranged on the inner peripheral side of each of the elastic water stopping portions 2a as described above.

The above-described base sleeve 1 and elastic sleeve 2
Are combined, that is, the elastic member 2 is put on the base sleeve 1 to form the repair member. The repairing member is attached to a device called a fitting machine as described above, and is transported in the pipeline to a repair required location. This fitting machine is disclosed in, for example, Japanese Patent Application No.
No. 26435 is used. FIG. 9-
FIG. 13 shows an outline of this fitting machine.

As shown in FIG. 9 (A), the fitting machine 3 has an inflatable body 3a and a carrier 3b for supporting the body. Wheels 3c are provided on the carrier. The fitting machine 3 travels in the pipeline. The carrier 3b has a main body 3b-1 for holding the body inside the body 3a (see FIG. 9B). Rubber cylindrical body 3a
Is attached to the cylindrical main body 3b-1 with its ends tightened, and thus forms a closed space with the cylindrical main body 3b-1. The body 3b-
Compressed air is fed through the inside of the cylindrical body 1, and the sent compressed air expands the cylindrical body 3 a to increase its outer diameter.

The fitting machine 3 shown in FIG. 10 comprises a tire tube-shaped rubber body 3a-1 having a flat cross section and a main body 3b.
-1. As in the case of FIG. 9A, compressed air is supplied into the body 3a via the inside of the main body 3b-1, and is expanded as shown in FIG. 10B.
At this time, the flange members 3 provided at both ends of the main body 3b-1
By the side restricting action by b-2, the trunk 3a is expanded while maintaining a substantially uniform outer shape.

The fitting machine 3 of FIG. 11 has two body elements 3a-2 connected in place of one body of FIG. According to this fitting machine, the right and left trunk elements can be expanded at different timings as necessary (FIG. 11).
(B)).

In the fitting machine 3 shown in FIG. 12, the two body elements shown in FIG. 11 are separated from each other, and each of the two body elements is restricted laterally by a flange member 3B-2.

The fitting machine 3 shown in FIG. 13 is provided with three trunk elements, each of which is inflated independently.

To repair a seam where a step is formed in the pipeline, a repairing member is loaded into the body of the fitting machine 3 in an appropriate manhole, and the fitting machine is run to reach a repair required joint. Then, compressed air is supplied into the body 3 from the ground through a conduit to expand the body 3a. With this expansion, the diameter of the repair member is gradually increased. In the middle of this diameter expansion, a step joint part pipe end inner peripheral edge projecting so as to narrow the inner diameter of the pipe is present facing the center part of the repairing member, and the center part has an outer diameter larger than both side parts. Since the diameter of the elastic member 2 is reduced, the diameter of the repair member is still increased without being hindered by the inner peripheral edge of the step joint portion, and the elastic water blocking portion 2a provided at the end of the elastic sleeve 2 is connected to the pipe. The diameter of the repairing member is expanded until it is sufficiently pressed against the inner surface of the road to produce a water stopping effect.

While the diameter expansion is being performed, the overlapping ends of the base sleeve 1 of the repairing member slide with each other due to the engagement means configured as described above, so that the repairing member expands. Allow diameter. When it is confirmed from the ground that the diameter of the repair member has reached the end, the pressure in the body 3 is rapidly increased, and the supply of the compressed air is stopped, and the body 3 is reduced. At this time, the repairing member also shows a trend of diameter reduction due to the action of the elastic water blocking portion compressed between the pipe inner wall surface and the like, but the diameter reduction is prevented by the action of the locking means 1a and 1b.
Thus, the attachment of the repair member to the step joint is completed.

[0032]

According to the partial repairing member of the present invention described above, the repair at the joint having a relatively large step can be performed quickly and reliably.

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional view of one embodiment of a flexible base sleeve which is a component of a repair member of the present invention.

FIG. 2 is a plan view showing a flat state before the base sleeve of FIG. 1 is formed into a cylindrical shape.

FIG. 3 is a sectional view taken along the line BB of the base sleeve of FIG. 1;

FIGS. 4A and 4B are a partial perspective view of one embodiment of a locking means provided at both ends of a base sleeve and a circumferential cross-sectional view schematically showing an engagement state of a pair of locking portions. is there.

FIG. 5 is a schematic front view (A) and an enlarged view (A) of a portion A of a base sleeve having locking means according to another embodiment.

FIG. 6 is a circumferential cross-sectional view schematically showing an engagement state of a pair of locking portions in another embodiment of the locking means, a schematic plan view of one locking portion, and FIG. It is a schematic plan view (C and D) of the other locking part.

FIG. 7 is a partial central longitudinal sectional view showing another embodiment of the base sleeve.

FIG. 8 is a partial central longitudinal sectional view showing several embodiments of an elastic sleeve.

FIG. 9 is a side view (A) showing an embodiment of the fitting machine, and a partial longitudinal sectional view (B) at the time of expansion.

FIG. 10 is a partial longitudinal sectional view (A) showing another embodiment of the fitting machine and a partial longitudinal sectional view (B) at the time of expansion.

FIG. 11 is a partial longitudinal sectional view (A) and a partial longitudinal sectional view (B) of the fitting machine according to still another embodiment when inflated.

FIG. 12 is a partial longitudinal sectional view (A) showing a further embodiment of the fitting machine, and a partial longitudinal sectional view (B) when inflated.

FIG. 13 is a partial longitudinal sectional view (A) showing a further embodiment of the fitting machine and a partial longitudinal sectional view (B) when inflated.

14A is a perspective view of a base sleeve of a conventional partial repair member, and FIG. 14B is a perspective view of an elastic sleeve mounted on the base sleeve.

[Explanation of symbols]

 Reference Signs List 1 base sleeve 1a claw 1b tip edge 1m diameter reduction range 2 elastic sleeve 2a-1 elastic water stop part 3 fitting machine 3a body Department

Claims (2)

[Claims] When the cylindrical portion is wound in a cylindrical shape so that both ends in the circumferential direction overlap with each other, and furthermore, the overlapping portions are slidable with each other so that the diameter can be increased, and when the overlapping portions are engaged with each other, A base sleeve provided with locking means for allowing sliding of both parts in the diameter increasing direction but preventing sliding of both parts in the diameter reducing direction, and can be fitted and mounted on the outer peripheral surface of the base sleeve. And a resilient sleeve having an annular resilient water stopping ridge protruding from the outer peripheral surface from other portions in the vicinity of both end portions. A pipe portion repairing member having a portion in which the outer diameter is reduced at a central portion in a direction. 2. The pipe part repairing member according to claim 1, wherein flanges extending outward in the axial direction are provided at both ends in the axial direction of the base sleeve.