JPH10325498A - Leakage preventing tool for fluid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability by a method wherein a lower covering pipe is locked at a fluid pipe. SOLUTION: A lower covering pipe 3b is formed of elastic deformable synthetic resin and two side parts making contact with the outer peripheral surface of a fluid pipe 1 and an upper opening end is formed approximately in the shape of a half-cylinder positioned above the pipe axis of the fluid pipe 1. Thereby, when the covering pipe 3b is pushed against the fluid pipe 1 from below, locking is effected in a way that the two side parts are forced into pressure contact with the outer peripheral surface of the fluid pipe 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leak preventing device for preventing water leakage by being attached to a damaged part of a water pipe, for example, and particularly to a fluid leakage device capable of improving workability at the time of attachment. About prevention equipment.

[0002]

2. Description of the Related Art Water pipes buried in the ground may be cracked due to ground vibration or ground pressure caused by an earthquake, an automobile, or the like, which may cause a water leakage accident.

[0003] In this case, a half-cylindrical leak-proof device is usually used for water-stopping work. The leak-preventing device is fitted over a damaged portion of a water pipe via a packing, and the flange portions are connected to each other with bolts and nuts. Water is stopped by fastening.

[0004] Most of the conventional water leakage prevention devices are made of ductile cast iron.

[0005]

SUMMARY OF THE INVENTION A half-cylindrical leakage prevention device, that is, a water leakage prevention device comprising a pair of cladding tubes having a semi-cylindrical shape, is designed to facilitate the work of tightening a nut at the time of mounting. Generally, the water pipe is attached so as to surround the outer peripheral surface from above and below.

[0006] For this reason, a conventional cast iron leak prevention device is heavy, and the mounting operation while pressing the lower cladding tube against the water pipe is troublesome, which causes a reduction in work efficiency. I have.

Further, when tightening the flanges of the upper and lower cladding pipes with a plurality of bolts and nuts, the bolts and nuts are inserted into the flanges upward from below in consideration of workability at the time of tightening. Since the nut is tightened, it is necessary to insert the nut while holding down the bolt to prevent the bolt from dropping, and the operation is troublesome.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a fluid in which a lower cladding tube is engaged with a fluid tube so that the workability and work efficiency of mounting can be greatly improved. The purpose of the present invention is to provide a leakage prevention device.

[0009]

In order to achieve the above-mentioned object, a fluid leakage prevention device according to the present invention provides a fluid pipe with a damaged portion of a fluid pipe.
In a leakage prevention device that is surrounded by a pair of cladding tubes and secures water-tightness by fixing opposite longitudinal edges of both cladding tubes, thereby preventing leakage of fluid from the damaged portion, At least the lower cladding tube is formed of a synthetic resin that can be elastically deformed in the radially expanding direction, and both side portions of the cladding tube that come into contact with the outer peripheral surface of the fluid pipe are formed such that the upper open end faces thereof are at the center of the fluid pipe axis. It is characterized by having a substantially semi-cylindrical shape located above.

According to the fluid leakage prevention device of the present invention, a damaged portion of a fluid pipe is surrounded by a pair of cladding pipes, and longitudinally opposed edge flanges of both the cladding pipes are fixed to ensure watertightness. In the leakage preventing device for preventing leakage of a fluid from the damaged portion, the at least the lower cladding tube is formed of a synthetic resin, and an elastically deformable latch is provided at an appropriate position on an inner surface thereof. It is characterized in that the piece is provided such that the upper end thereof can be locked at an upper portion of the outer peripheral surface of the fluid pipe.

In the fluid leakage preventing device of the present invention, the fixing means for fixing the opposing edges of both cladding tubes includes a bolt inserted from below into a flange of the lower cladding tube, A bolt that is screwed to the bolt above the flange of the pipe, wherein a bolt-through hole in the flange of the lower cladding pipe is provided with a flexible projection that slides on the outer peripheral surface of the bolt. Is preferred.

According to the present invention, when the lower cladding tube is pressed against the fluid pipe from below, at least the lower cladding tube is formed of a lightweight synthetic resin, and the upper opening on both sides is formed. The end face goes around the outer peripheral surface of the fluid pipe above the center of the pipe axis, or the locking piece is hooked on the outer peripheral surface of the fluid pipe closer to the upper side and is locked, thereby improving workability.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 4 show a first embodiment of the present invention, in which a leak preventing device 2 is mounted on an outer peripheral surface of a water pipe 1 made of vinyl chloride and surrounding a damaged portion. .

The leak preventing device 2 comprises a pair of upper and lower semi-cylindrical cladding tubes 3a, 3b formed of a long glass fiber reinforced thermoplastic resin, for example, a polypropylene resin. The portion has an inner diameter that is substantially the same as the outer diameter of the water pipe 1, and the intermediate body portion excluding that portion has a larger diameter.

The upper open end surface of the lower cladding tube 3b is located above the center of the water pipe 1 by a required dimension, and the cladding tube 3b is pressed more strongly against the outer peripheral surface of the water pipe 1 below. At this time, as shown in FIG. 3, the openings at both ends are elastically deformed in the radially expanding direction, get over the maximum outer diameter portion of the water pipe 1, and are located above the center 0 thereof, thereby preventing falling. You.

A flange 4 is outwardly provided on both sides of each of the cladding tubes 3a and 3b in the longitudinal direction so that four through holes 5 are aligned with each other vertically. It is formed.

A metal washer 6 is fitted on both sides of the upper surface of the flange 4 of the upper cladding tube 3a, and the washer 6 is formed with a through-hole (not shown) that matches the through-hole 5. .

On the other hand, on both sides of the lower surface of the flange 4 of the lower cladding tube 3b, a washer 6 similar to the above and a detent plate having a hexagonal hole into which a head of a bolt 12 described later is fitted. 7 are fitted together with the rotation preventing plate 7 facing downward.

A drain pipe 8 is screwed onto the upper surface of the central part of the upper coating pipe 3a, and is closed by a water blocking cap 9.

As shown in FIG. 4, a rubber packing 11 is fitted into a fitting groove 10 formed on the inner surface of the open end of each of the cladding tubes 3a, 3b and the surface facing the flange 4. In addition, the packing 11 comprises upper and lower cladding tubes 3a, 3b.
Has a rotationally symmetrical shape with respect to the pipe axis, and has only one flange 4 portion.

When the cladding pipes 3a and 3b are attached to the water pipe 1, the packing 11 on the inner surface of the open end presses against the outer peripheral surface of the water pipe 1 and the packing 11 on one flange 4
Is pressed against the flat surface of the other flange 4, thereby ensuring the watertightness of the water pipe 1 surrounded by the leakage preventing device 2 and preventing water leakage from the damaged portion.

Next, the procedure for attaching the leak preventing device 2 of the first embodiment to a damaged portion of the water pipe 1 will be described.

First, the lower cladding tube 3b is pressed from below onto the lower surface of the water pipe 1 at a position distant from the damaged portion and is elastically locked. When the amount of water leakage from the damaged part is relatively small, it may be directly attached to the damaged part.

Next, after the upper cladding tube 3a is placed on the upper surface of the lower cladding tube 3b, a nut 13 is screwed into the upper part of the bolt 12 inserted from the lower side to be slidable in the tube axis direction. Temporarily.

Next, the entirety of the leak prevention device 2 is moved to the damaged portion, and after surrounding the outer peripheral surface of the portion, the nuts are evenly tightened and fully mounted as shown in FIG. At this time, when a large amount of water leaks from the damaged portion and the tightening work is troublesome due to the water pressure in the cladding tubes 3a and 3b, the water stop cap 9 is loosened and drainage is performed from the drainage pipe 8. Good to do.

The upper and lower cladding tubes 3a,
When the 3b is tightened, as described above, the packing 11 is pressed against the outer peripheral surface of the water pipe 1 and the opposing surfaces of the upper and lower flanges 4 to stop water.

As described above, in the leakage preventing device 2 of the first embodiment, the lower covering tube 3b is formed of a resin to reduce the weight while making use of the fact that it can be elastically deformed. Locked on the outer peripheral surface of the tube 1. With this configuration, unlike the related art, it is not necessary to perform the tightening operation of the nut 13 while holding down the lower cladding tube 3b, and the workability is significantly improved.

FIGS. 5 and 6 show a second embodiment of the present invention. In this embodiment, the upper and lower cladding tubes 3a and 3b are formed in substantially the same semi-cylindrical shape so as to be vertically symmetrically mounted on the water pipe 1, and the upper ends of the lower cladding tube 3b on both left and right sides. On both sides of the inner edge of the opening, a pair of C-shaped elastic locking pieces 14, 14 are continuously provided.

When the lower covering pipe 3b is pressed against the outer peripheral portion of the water pipe 1 from below, the respective elastic locking pieces 14 are elastically deformed in the radially expanding direction, and the upper end thereof is located outside the maximum of the water pipe 1. By falling over the diameter portion and pressing against the upper portion of the outer peripheral surface, the fall is prevented. Also in the second embodiment, there is no need to press down the lower cladding tube 3b, so workability is significantly improved.

FIG. 7 shows an annular tongue piece 15, which is a flexible inwardly projecting piece that slides in contact with the outer peripheral surface of the bolt 12, in the upper end opening of the through hole 5 in the flange 4 of the lower cladding tube 3b. 2 shows an embodiment provided continuously.

When such a tongue piece 15 is provided, when the bolt 12 is inserted from below into the through hole 5 of the flange 4, the tongue piece 15 is deformed upward as shown in FIG. Bolt 1
2 is prevented from falling off.

Therefore, there is no need to hold down the bolts 12, and after all the bolts 12 have been inserted into the through holes 5,
Insert the upper flange 4 through the upper part of the nut 1
Since the screw 3 only needs to be inserted, the workability is further improved.

The present invention is not limited to the above embodiment. For example, in the above embodiment, when the cladding tube 3b is small, the locking piece 14 is provided only at the center portion, or one of the pair of locking pieces 14 on both left and right sides is omitted. You may.

In the above embodiment, the upper and lower cladding tubes 3a, 3b
Are made of a synthetic resin. For example, when the fluid pipe requires a large-diameter leakage prevention tool 2 with a large diameter and a large tightening strength, the upper cladding pipe 3a is made of a conventional cast iron. And only the lower cladding tube 3b may be made of synthetic resin.
In the embodiment, the annular tongue piece 15 is used as the inward projecting piece. However, the present invention is not limited to this, and it is also possible to provide one inwardly protruding portion or a plurality of such protruding portions.

[0036]

According to the first and second aspects of the present invention, the cladding tubes are fixed to each other while the lower cladding tube is locked to the fluid tube, for example, the bolts and nuts are used to fix the cladding tubes. Since work can be performed, workability and work efficiency are greatly improved.

According to the third aspect of the present invention, the bolt can be prevented from coming off, so that it is not necessary to hold the bolt with one hand, and the workability when fastening and fixing the bolt is further improved.

[0038]

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing a state in which a first embodiment of the present invention is mounted on a damaged portion of a fluid pipe.

2 is a longitudinal sectional side view of the center of FIG.

FIG. 3 is a vertical sectional front view taken along the line III-III of FIG. 1;

FIG. 4 is a plan view of a lower cladding tube.

FIG. 5 is a partially cutaway side view showing a state in which the second embodiment of the present invention is mounted on a damaged portion of a fluid pipe.

FIG. 6 is a vertical sectional front view taken along the line VI-VI in FIG. 5;

FIG. 7 is an enlarged vertical cross-sectional view of a main part showing an example in which bolt prevention means is provided in a through hole of a lower flange.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water pipe 2 Leak prevention device 3a, 3b Coated pipe 4 Flange 5 Through hole 6 Washer 7 Non-rotating plate 8 Drain pipe 9 Waterproof clip 10 Fitting groove 11 Packing 12 Bolt 13 Nut 14 Locking piece 15 Ring tongue Piece (projecting piece)

Claims (3)

[Claims] 1. A damaged portion of a fluid pipe is surrounded by a pair of cladding tubes, and the longitudinally opposed edges of both cladding tubes are fixed to each other to secure watertightness, thereby leaking fluid from the damaged portion. In the leakage preventing device, the at least the lower cladding tube is formed of a synthetic resin that can be elastically deformed in a radially expanding direction, and both side portions of the cladding tube that come into contact with the outer peripheral surface of the fluid pipe. A fluid leakage prevention device characterized in that the upper opening end surface is substantially semi-cylindrical and located above the center of the pipe axis of the fluid pipe. 2. A damaged part of the fluid pipe is surrounded by a pair of cladding pipes, and the flanges facing each other in the longitudinal direction of the two cladding pipes are fixed to each other to secure watertightness, so that fluid from the damaged part is prevented. In the leak preventing device for preventing leakage, at least the lower coating tube is formed of a synthetic resin, and a locking piece elastically deformable in a radial direction is provided at an appropriate position on an inner surface thereof. A device for preventing fluid leakage, which is provided so as to be able to be locked at an upper portion of an outer peripheral surface of a pipe. 3. A fixing means for fixing opposing edges of both cladding tubes, comprising: a bolt inserted from below into a flange of the lower cladding tube; and a bolt above the flange of the upper cladding tube. 3. A bolt comprising: a nut which is screwed into a nut; and a bolt-through hole in a flange of the lower cladding tube is provided with a flexible projection which slides on an outer peripheral surface of the bolt. A fluid leakage prevention device as described in the above.