JPH0337677B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides leakage repair or prevention for a part of a pipe body such as a pipe joint where a leakage phenomenon occurs or is likely to occur in an underground pipeline such as a gas pipe. This invention relates to a cover for sealing the pipe body of an underground pipeline used when repairing the seal for maintenance purposes.

[Conventional technology]

This type of tube seal cover has already been proposed, for example, in Japanese Patent Publication No. 53-3099 and Japanese Utility Model Application Publication No. 52-17921.

In these prior art techniques, a part of the pipe body (mainly the pipe joint part) of the underground pipe to be repaired is exposed in a hole opened above ground by excavation, and a sealing cover is wrapped around the outside of the exposed part of the pipe body. After fixing both ends, sealing resin is filled in the annular space between the cover and the tube and allowed to solidify, allowing the repaired tube to be sealed from the outside while gas is still flowing. It is something.

[Problem to be solved by the invention]

When repairing underground pipelines using the sealing cover as described above, the following problems were encountered.

In other words, the sealing cover is wrapped around the pipe body (pipe joint part) of the repaired area exposed in the excavated hole so as to surround the pipe joint part, and after wrapping, the mating edges are joined with fasteners, etc. In addition, both ends of the cover are secured to the pipe by tightening bands to form an annular space for injection of sealing resin inside the cover. If the pipe is laid at a shallow depth, the operator's hands can reach the exposed part of the pipe from the ground, so the above-mentioned covering operations such as wrapping the cover and joining the mating edges can be performed from the ground without any problems. If the conduit is laid at a deep depth, the operator cannot reach the exposed part of the pipe body, so there is a problem that the covering work cannot be carried out from the ground.

In order to solve this problem, it is conceivable that a worker should enter the excavation hole and cover it with a cover, but in such a case... First of all, you have to dig a large hole, which is inconvenient and takes a lot of time and money. Furthermore, when workers enter an excavated hole to work, due to construction safety standards, the excavated hole must be equipped with earth-holding measures to prevent landslides. In addition, there were many restrictions on the construction work, such as the fact that workers had to wear safety masks due to the possibility of gas leaks, which meant that repair work required a lot of time and money.

In view of the above-mentioned disadvantages, the present invention makes it possible to easily and easily cover a pipe body exposed in an excavated hole from above ground level even when the pipe body to be repaired is laid at a deep depth. To provide a cover for sealing the pipe body of an underground pipe, which eliminates the need to dig a large hole, minimizes the area of the hole, and shortens the repair work period and reduces costs. This is the purpose.

[Means to solve the problem]

To achieve this objective, the sealing cover according to the invention is provided with fasteners for joining the mating edges to each other on the mating edges wrapped around the tube body, the fasteners comprising a pair of fasteners fixed to the mutual mating edges. Both ends of the fastener belt piece are separable, and both ends of the fastener belt piece extend in both directions longer than the cover width, and can be attached to the above-ground opening of the excavation hole at least with the cover wrapped around the outer periphery of the pipe body. It is characterized in that it is formed to have a dimension that has a length that reaches .

[Effect]

According to such a configuration, when the ends of the pair of fastener belt pieces fixed to the mating edges of the cover are separated, the sealing cover becomes an expanded state, and a predetermined length is attached to each of the four ends of the mating edges. The fastener belt piece having the shape is in an extended state.

Therefore, when wrapping the sealing cover around the exposed part of the pipe, two fastener belt pieces extend from both ends of the mating edge on the side to be wrapped first, and two pieces extend from both ends of the mating edge on the other side. With the extended ends of the other two fastener belt pieces supported on the ground of the excavated hole, the two fastener belt pieces to be wrapped in advance are
Each extending end of the book fastener belt piece is hung down into the hole from the ground level of the excavated hole, passed under the exposed part of the pipe body using a suitable hooking rod, and pulled up to the ground level from the opposite side. After this lifting, the sealing cover can be set in a state where it is normally wrapped around the exposed part of the pipe body at the repair location by holding the extending ends of both sets of fastener belt pieces and rotating the cover appropriately from the ground. .

After that, from the ground, the extending ends of both fastener belt pieces are connected to each other so that the pair of fastener belt pieces fixed to the mating edges of each other are connected to each other, and the slider is moved from the ground using an appropriate operating rod. By moving the sealing cover, the mating edges of the sealing cover are joined.

As a result, the wrapping of the sealing cover around the exposed part of the pipe at the repair site and the joining of the mating edges can be performed from the ground using the fastener belt piece, without the need for the operator to enter the excavation hole. It becomes possible to wrap the cover around the repaired part of the pipe body.

〔Example〕

An embodiment of the present invention will be described below with reference to the accompanying drawings.

In the figure, reference numeral 1 indicates a tube sealing cover body, which is made of an airtight woven fabric coated with resin inside. Similarly to the conventional cover body 1, the cover body 1 is wrapped around the pipe joint A, which is the repaired part of the pipe, and the right end part is wrapped around the pipe joint A, sandwiching the pipe joint A. A bulging portion 1c large enough to surround the flange of the pipe joint portion A is formed between the left end portion 1a and the left end portion 1b that is wound around the other tube body. The inner surfaces of the right end 1a and the left end 1b of the cover body 1 are provided with cushion sheets made of foamed resin, such as polyurethane, in order to improve the adhesion to the tube body when tightening with the tightening bands 8, 8, which will be described later. 2 and 2' are attached.

In addition, the joint edge of the cover main body 1 that is wrapped around the tube constitutes a binding part using the fastener 3, so that a fastener belt piece 3a having a convex chuck claw on one side is attached to one joint edge, and a fastener belt piece 3a having a convex chuck claw is attached to the other side. A fastener belt piece 3b having a concave chuck claw on the other side to be combined therewith is sewn and fixed to the joining edge.

In the present invention, the above-mentioned pair of fastener belt pieces 3a, 3b extend longer than the left and right widths of the sealing cover main body 1, and both ends of the fastener belt pieces 3a, 3b are attached to the cover main body 1, which will be described later. It is formed to have a length that reaches the above-ground opening of the excavation hole when it is wrapped around the outer periphery of the tube, and a coupling slider 3c for fastening is attached to one end of the tube.
is equipped.

At the joint edge of the cover main body 1, a crosslinked sheet extends from the side to which one fastener belt piece 3a is sewn to the joint edge on the side to which the other fastener belt piece 3b is sewn, toward the inner surface thereof. Piece 2'' is extended.This crosslinked sheet piece 2'' is
It is composed of a cushion material that is integrally continuous with the cushion sheets 2 and 2' attached to the right end 1a and left end 1b of the cover main body 1, and is cross-linked when the cover main body 1 is joined by binding with the fastener 3. The sheet piece 2'' extends from one joint edge to the inner inner surface of the other joint edge, and comes into elastic contact with the joint portion of the cover body 1 by the fastener 3 from the inside.

Non-permeable membranes 2a, 2a', 2a'' for airtightness are formed on the inner surfaces of the cushion sheets 2, 2' and the crosslinked sheet pieces 2''. Further, an adhesive is attached to the outer surface of the crosslinked sheet piece 2'', and a peeling belt 4' is attached to the free edge thereof.

In FIG. 1, reference numeral 5 indicates guide protrusions for regulating the position of the seaming bands 8, 8, which protrude outward from the right end 1a and left end 1b of the cover body 1, and 9a to 9d indicate guide protrusions on the tube body. These hook pieces are used to shift the position of the wrapped cover body 1, and are provided on four outer surfaces of the cover body 1.

Further, the cover main body 1 has a ventilation tube 6 connected to the upper part of the bulge 1c when the cover body 1 is wound around the tube, and this vent tube 6 is opened inside the bulge 1c. Further, an injection tube 7 for sealing resin is connected to the lower part of the bulging portion 1c.
This is also opened inside the bulged portion 1c. And these ventilation tube 6 and injection tube 7,
It has a length that reaches the above-ground opening of the excavation hole in a state in which the outer periphery of the tube is covered with a cover body 1, which will be described later.

Seal cover body 1 configured as above
An example of repairing an underground pipe will be explained using the following.

First, as a pre-work step, the pipe body of the repaired part (pipe joint part A) is excavated to the minimum necessary extent to expose it in an excavated hole opened above ground. (See Figure 2).

When the sealing cover main body 1 is separated from both ends of the pair of fastener belt pieces 3a and 3b fixed to each joining edge, the cover main body 1 is in an unfolded state, and each joining edge is attached in the direction of both ends. A total of four fastener belt pieces 3a and 3b, two fastener belt pieces each having a predetermined length, are extended. In this unfolded state, the peeling belt 4' of the crosslinked sheet piece 2'' is peeled off.

Next, as shown in FIG. 3, the two extensions of the fastener belt piece 3b fixed to one joint edge, extending long in both directions, are set as a set, and the ends of the two extensions are inserted into the excavation hole from the ground as shown in FIG. hang it down, bypass the bottom of the pipe joint A using a hanging rod, etc., and pull it up to the ground from the other side. In this case, both ends of the fastener belt piece 3a fixed to the other joining edge are supported on the ground.

By pulling both ends of the above-mentioned pulled-up fastener belt piece 3b, the seal cover main body 1 in the unfolded state is passed under the pipe joint A of the repaired area as shown in FIG. The winding is set.

In this state, a pair of fastener belt pieces 3a,
3b extend outside the excavation hole and are located on the ground, and then a pair of fastener belt pieces 3a, which are fixed to the mutual joint edges of the cover body 1,
Combined slider 3 with 3b on one end
When c is moved, the fasteners 3 are bound together as shown in FIG. The main body 1 is wrapped around and set around the pipe joint part A.

Note that when the mating edges of the cover body 1 are joined by binding the fastener 3, the free end side of the bridging sheet piece 2'' extending from one joining edge straddles the other joining edge and is attached to the inner inner surface. The half-width portion of the free end side of the fastener 3 is airtightly adhered to the inner surface of the other joint edge by using the adhesive exposed on the outer surface by peeling off the peeling belt 4', thereby securing the fastener 3. Thus, the airtightness of the joint portion of the cover body 1 is ensured.

After the sealing cover main body 1 is wrapped and set to cover the pipe joint A to be repaired as described above, the right end 1a and the left end 1b of the cover main body 1 are set as shown in FIG. Tightening bands 8, 8 are suspended from one end side from the ground, wrapped around the surroundings with a hook rod or the like, and the ends are tied and fixed from the ground. Thereafter, as shown in FIG. 7, when sealing resin is injected and filled using the tube 7 extending above the ground, the bulge part 1c and the pipe joint part A are filled.
The air remaining in the gap between the tube and the outer surface of the tube is discharged upward through the other tube 6, and the annular space within the bulge 1c is filled with sealing resin.

Thereafter, after the sealing resin has solidified over time, the tubes 6, 7, fastener 3, etc., together with the sealing cover body 1, are wrapped around the repaired pipe body as shown in Fig. 8, and then the excavated hole is opened. The area will be backfilled and repairs will be completed.

〔Effect of the invention〕

As detailed above, according to the sealing cover according to the present invention, both ends of the pair of fastener belt pieces of the fastener that join the mating edges of the cover body can be separated, and both ends of the fastener belt pieces are attached to the cover. The sealing cover extends in both directions longer than the width of the pipe, and has a length that reaches at least the above-ground opening of the excavation hole when the cover is wrapped around the outer periphery of the pipe body. When wrapping and setting the exposed part of the pipe body, the above-mentioned extension of the fastener belt piece can be used to perform the winding operation from the ground, and at the same time, the fastener can be tied from the ground by the above-mentioned extension. By making it possible to join the mating edges of the cover, workers can wrap the cover around the pipe repaired area without entering the excavation hole, reducing the excavation hole to the minimum necessary. This eliminates the need for large excavations, and eliminates the need for construction such as embankments, which shortens the excavation work period and costs, and significantly improves work efficiency.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the present invention;
The figure is a transparent perspective view showing a state in which an excavated hole has been formed to expose the pipe joint portion at the repair location, and FIGS. 3 to 8 are transparent perspective views showing the work steps. 1... Seal cover body, 1a... Right end, 1b
...Left end part, 1c...Bulging part, 2, 2'...Cushion sheet, 2''...Crosslinked sheet piece, 3...Fastener,
3a, 3b... Fastener belt piece, 3c... Slider, 4'... Peeling belt, 5... Guide protrusion for regulating the position of the seaming band, 6... Ventilation tube, 7... Injection tube for sealing resin, 8... Sealing band, A...
Pipe joint part to be repaired.

Claims (1)

[Scope of Claims] 1 A part of the pipe body of an underground pipe to be repaired is exposed in a hole opened above ground by excavation, a sealing cover is wrapped around the outside of the exposed part of the pipe body, and both ends are fixed. After that, the annular space between the cover and the pipe body is filled with a sealing resin and solidified to repair the seal, and the sealing cover is provided with fasteners that join the mating edges to each other, and the fasteners are mutually connected. Both ends of the pair of fastener belt pieces fixed to the mating edges of the fastener belt piece are separable, and both ends of the fastener belt piece extend in both directions longer than the cover width, and at least the cover is wrapped around the outer periphery of the tube body. 1. A cover for sealing a pipe body of an underground pipe, characterized in that the cover is formed to have a length that reaches an above-ground opening of an excavation hole when the cover is in a state where the pipe body is sealed.