JPH10246385A - Partial repair method of hume pipe and partial repair structure thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the strength, resistance against peeling, and water tightness greatly by shrinking a diameter of an open annular belt, inserting the belt into a Hume pipe, bringing the open annular belt into pressure-contact with an inner face of the Hume pipe by a diameter expansion tool, planting a wheel anchor in the Hume pipe, and fixing the open annular belt by using a nut. SOLUTION: First, a waterproof packing is fitted into a packing fitting groove of an open annular belt 2, and a diameter of the open annular belt 2 is shrunk to be smaller than an inside diameter of a Hume pipe 1. Next, screw rods 4a, 4a of a turn buckle 4 are engaged with screw rod receive parts of the open annular belt 2, the turn buckle 4 is mounted on an inner side of the open annular belt 2, and the open annular belt 2 is inserted down to a section to be repaired in the Hume pipe 1. Then, a diameter of the open annular belt 2 is expanded to bring the open annular belt 2 into pressure-contact with an inner face of the Hume pipe 1, then a nut 6 is screwed in a wheel anchor 5 from an inner side of the open annular belt 2 to fix the open annular belt 2, and then the turn buckle 4 is removed to complete a partial repair work of the Hume pipe 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a partial repair method and a partial repair structure for a fume pipe buried underground as a sewer pipe or the like.

[0002]

2. Description of the Related Art Concrete fume pipes buried in the ground as sewage pipes and the like have a problem that, as time passes, the inner surface of the pipes partially erodes, and cracks and cracks occur.

[0003] When the fume tube is partially damaged as described above, conventionally, the inside of the damaged portion of the fume tube has been partially repaired by lining a resin-impregnated fiber sheet or the like.
In addition, the connection portion of the fume pipe was similarly repaired by lining the resin-impregnated fiber sheet from the inside.

In this partial repair work, an uncured resin impregnated fiber sheet is wrapped around a rubber sleeve type repair device capable of expanding and contracting and inserted into a portion of the fume tube to be repaired, and the rubber sleeve type repair device is expanded to expand the resin. By performing thermosetting of the impregnated resin while the impregnated fiber sheet is pressed against the inner surface of the tube, the impregnated resin can be comparatively easily implemented, but has the following problems.

[0005]

That is, when the fume pipe is partially repaired by the above-mentioned method, the thickness of the cured resin-impregnated fiber sheet tends to be non-uniform, and particularly, both ends of the sheet are thinned due to resin oozing. , The strength decreases. Also,
In some cases, insufficiently cured portions remain, and the strength may vary. For this reason, when cleaning the inner surface of the fume tube by spraying high-pressure water, the thinned ends and insufficiently cured portions of the resin-impregnated fiber sheet are damaged by water pressure, and the sheet peels from there, In a severe case, there is a problem that the entire sheet is stripped from the inner surface of the fume tube.

[0006] Further, since the resin-impregnated fiber sheet has poor adhesion to the inner surface of the fume tube, sewage leaks from the damaged portion of the fume tube to the outside through a minute gap between the two, and unknown water enters the tube from the outside. There was also a fear of doing.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a method and a method for partially repairing a fume pipe capable of greatly improving strength, peel resistance, water tightness and the like. To provide a repair structure.

[0008]

According to a first aspect of the present invention, there is provided a method for partially repairing a fume tube, comprising the steps of: fitting a plurality of packings formed on an outer peripheral surface of a metal annular belt; A waterproof packing is fitted in the groove, the both ends of the open annular belt are overlapped, and the diameter of the open annular belt is reduced so as to be smaller than the inner diameter of the fume tube. After inserting this open annular belt to the point to be repaired in the fume tube, expand the open annular belt with the expanding tool and press it against the inner surface of the fume tube. The nut is screwed into the hole-in anchor implanted in the fume pipe through the inside of the fume pipe from the inside of the open annular belt to fix the open annular belt.

According to this partial repair method, since the diameter of the open belt is reduced and inserted into the fume tube, the work of inserting the open belt is easy. After insertion, the waterproof packing is closely attached to the inner surface of the fume tube to press the annular belt against the inner surface of the fume tube with a diameter expander. Since the annular belt is fixed, the watertightness is greatly improved.
In addition, since the open ring belt is made of metal, the strength is large,
In addition, since the hole is fixed firmly by the hole-in anchor and the nut, there is no fear that the open annular belt is damaged or peeled off even when high-pressure water is sprayed during the cleaning operation.

According to a second aspect of the present invention, there is provided a method for partially repairing a fume pipe, wherein a turnbuckle is used as a diameter-enlargement tool, and both ends of the threaded rods of the turnbuckle are opened with an annular belt. The turnbuckle is mounted inside the open annular belt by engaging with a threaded rod receiving portion formed on the inner surface near both ends of the open belt.

When the turnbuckle is mounted as a diameter-enlarging device in this manner, the diameter of the open-ring belt can be easily and powerfully expanded only by rotating the screw cylinder of the turnbuckle, so that the operation of expanding the open-ring belt becomes easy. In addition, the degree of adhesion of the waterproof packing to the inner surface of the fume tube is increased, and it is possible to perform partial repair with even better watertightness.

According to a third aspect of the present invention, a pair of semi-annular belts made of metal having excellent corrosion resistance are joined as the open annular belt. It is characterized by using things.

Such an open annular belt can be easily transported without being bulky because it can be transported as it is in the form of a semi-annular belt and joined on site, and has excellent durability because it does not corrode in a short period of time. Partial repair can be performed.

According to a fourth aspect of the present invention, there is provided a partial repair structure for a fume tube, wherein the metal open annular belt in which a waterproof packing is fitted in a plurality of packing fitting grooves formed on the outer peripheral surface is used to repair the fume tube. The hole-in anchor is implanted in the fume tube through the anchor insertion hole of the open ring belt, and a nut is screwed into the hole-in anchor from inside the open ring belt to fix the open ring belt. It is characterized by.

In such a partial repair structure, the waterproof packing is brought into close contact with the inner surface of the fume tube by the pressure contact of the open annular belt, so that the watertightness is improved. Moreover, since the open ring belt is made of metal and has high strength and is firmly fixed by the hole-in anchor and the nut, there is no danger of damage or peeling of the open ring belt.

According to a fifth aspect of the present invention, there is provided a partial repair structure for a fume tube according to the fourth aspect, wherein the open annular belt is formed by joining a pair of semi-annular belts made of a metal having excellent corrosion resistance. It is characterized by.

When such an open belt is used, there is no corrosion in a short period of time, so that the durability of the repaired portion is further improved.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view showing an embodiment of a method for partially repairing a fume pipe according to the present invention, in which a reduced-diameter open annular belt is inserted into the fume pipe, and FIG. FIG. 3 is a cross-sectional view showing a state where the diameter of the annular belt is expanded and pressed against and fixed to the inner surface of the fume tube.
And FIG. 4 is an exploded perspective view of the open annular belt and the waterproof packing.

1 to 3, reference numeral 1 denotes a concrete fume tube, 2 denotes a metal open ring belt, 3 denotes a waterproof packing, 4 denotes a diameter expanding tool for expanding the open ring belt 2, and 5 denotes a hole-in. Anchor 6 indicates a nut.

The fume pipe 1 to be subjected to the partial repair method of the present invention has a pipe diameter of about 600 mm or more. A fume pipe having a smaller pipe diameter is not suitable for the partial repair method of the present invention because it is difficult for an operator to enter the pipe and work.

The open annular belt 2 is formed by joining a pair of semi-annular belts made of a metal such as stainless steel (for example, SUS304) having excellent corrosion resistance. As shown in FIG. 4, one end of one semi-annular belt 2a is provided. A receiving portion 2c is formed in the vicinity, and as shown in FIG. 5, the end of the other semi-annular belt 2b is inserted into and joined to this receiving portion 2c. The semi-annular belts 2a and 2b may be joined by means such as welding.

On the outer peripheral surface of the semi-annular belts 2a, 2b constituting the open annular belt 2, two packing fitting grooves 2d, 2d having a substantially semicircular cross section are formed along both side edges of the belt. These packing fitting grooves 2d, 2d
To d, rubber waterproof packings 3 having a circular cross-sectional shape are fitted. A plurality of anchor insertion holes 2e are formed at appropriate intervals on both side edges of the belt.

Further, as shown in FIGS. 4 and 6, both threaded rods of the diameter expanding tool 4 are provided on the inner surfaces of the semi-annular belts 2a and 2b constituting the open annular belt 2 near the non-joined ends. 4
The threaded rod receiving portions 2f, 2f for engaging the a, 4a are formed. This diameter expanding tool 4 is a so-called “turn buckle” in which both threaded rods 4a, 4a having oppositely threaded threads are screwed into a screw cylinder 4b from both sides.
When the is turned in one direction, both screw rods 4a, 4a move in the direction away from each other, and when the screw cylinder 4b is turned in the opposite direction, both screw rods 4a, 4a move in the direction approaching each other. I have.

According to the partial repair method of this embodiment, the waterproof packings 3, 3 are respectively fitted into the packing fitting grooves 2d, 2d of the open annular belt 2 formed by joining the pair of semi-annular belts 2a, 2b as described above. The two ends of the open annular belt 2, that is, the non-joined ends of the semi-annular belts 2 a and 2 b are overlapped as shown in FIG. 1 to reduce the diameter of the open annular belt 2 so as to be smaller than the inner diameter of the fume tube 1. I do. Then, in this reduced diameter state, the distal ends of the threaded rods 4a, 4a of the turnbuckle 4 are engaged with the threaded rod receiving parts 2f, 2f of the open annular belt 2, and
A turnbuckle 4 is mounted inside the open annular belt 2, and the open annular belt 2 is inserted into the fume tube 1 to a portion to be repaired, as shown in FIG. 3, a damaged portion 1 a of the fume tube 1 to be repaired. The packing fitting grooves 2d of the open annular belt 2 are located on both sides of the belt. The insertion of the open annular belt 2 can be easily performed because the diameter of the open annular belt 2 is reduced. The turnbuckle 4 may be mounted after the open annular belt 2 is inserted into the fume tube 1.

When the operation of inserting the open belt 2 is completed, the screw cylinder 4b of the turnbuckle 4 is turned to move the two screw rods 4a of the turnbuckle 4 in directions away from each other as shown in FIG. As a result, the open belt 2
And press it against the inner surface of the fume tube 1. When the annular belt 2 is pressed in this way, the waterproof packings 3 are brought into close contact with the inner surfaces on both sides of the damaged portion 1a of the fume tube 1 as shown in FIG.

Then, while maintaining this close contact state, a hole-in anchor 5 is implanted in the fume tube 1 through each anchor insertion hole 2e of the open annular belt 2, and the open annular belt 2
The nut 6 is screwed into the hole-in anchor 5 from the inside to fix the open annular belt 2. The implantation work of the hole-in anchor 5 can be easily performed by making a hole 1b in the fume tube 1 through the anchor insertion hole 2 of the open annular belt 2 and driving the hole-in anchor 5 into the hole 1b.

When the fixing of the open belt 2 is completed, the turnbuckle 4b of the turnbuckle 4 is turned in the opposite direction to remove the turnbuckle 4 from the open belt 2, and the partial repair work of the fume tube 1 is completed.

Even when the diameter of the open annular belt 2 is increased by the turn buckle 4, if a portion of poor contact with the inner surface of the fume tube 1 partially occurs, the length is the same as the diameter of the fume tube 1. Using a large turnbuckle having the following, the poorly adhered portion is brought into close contact with the inner surface of the fume tube 1, and in this state, the turnbuckle 4 is further turned to bring the entire open annular belt 2 into close contact with the inner surface of the fume tube 1. What should be done is.

The portion where the fume tube 1 is repaired from the inside by the above-described method is, as shown in FIG.
Is pressed against the inner surface of the fume tube 1 so that the waterproof packings 3 and 3 are tightly adhered to the inner surfaces on both sides of the damaged portion 1a of the fume tube 1, and are opened by the hole-in anchor 5 and the nut 6 implanted in the fume tube 1. The belt 2 has a partial repair structure in which the belt 2 is firmly fixed.

As described above, the annular belt 2 is connected to the fume tube 1.
If the waterproof packings 3, 3 are pressed against the inner surfaces of the fume pipes 1 and strongly adhere to the inner surfaces on both sides of the damaged portion 1a of the fume tube 1, the waterproof packings 3, 3 greatly improve water tightness. Water flowing in the inside leaks out of the damaged portion 1a to the outside, and unknown water intrudes into the fume tube 1 from outside.

Further, since the open annular belt 2 is firmly fixed by the hole-in anchor 5 and the nut 6, when the high pressure water is sprayed to clean the fume tube 1, the open annular belt 2 is peeled off by the water pressure. You don't have to worry. Furthermore, since the open annular belt 2 is a high-strength metal belt having excellent corrosion resistance, it is not easily damaged or deteriorated in a short period of time, so that the durability of the repaired part is also improved.

In the partial repair method according to the above-described embodiment, the turnbuckle 4 is used as a diameter-expanding tool. However, any diameter-expanding tool that can expand the diameter of the open belt 2 can be used. . However, when the turnbuckle 4 is used, the diameter of the open annular belt 2 can be easily and strongly expanded simply by rotating the screw cylinder 4b. This is preferable because the degree of adhesion to the inner surface of the fume tube can be increased.

Further, in the partial repair method of the above-described embodiment, the open annular belt 2 in which the pair of semi-annular belts 2a and 2b are joined is used, but the open annular belt integrally manufactured from the beginning is used. Is also good. However, such an integrated ring-shaped open belt has a drawback of being inferior in transportability because of its large weight and bulk.
The open annular belt 2 composed of a and 2b is preferable because it can be transported to the site while being separated, so that it has good transportability and can be easily inserted and joined at the site for use.

[0035]

As is apparent from the above description, according to the present invention, the watertightness of the repaired portion of the fume pipe is greatly improved, so that there is no danger of water leakage and the like. Since it is excellent in property and firmly fixed so as not to peel off, a remarkable effect that the durability of the repaired part is greatly improved can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state in which a reduced-diameter open annular belt is inserted into a fume tube in an embodiment of a partial repair method for a fume tube according to the present invention.

FIG. 2 is a cross-sectional view showing a state in which the diameter of the open annular belt is increased and pressed and fixed to the inner surface of the fume tube in the embodiment.

FIG. 3 is a partially enlarged sectional view taken along line AA of FIG. 1;

FIG. 4 is an exploded perspective view of an open annular belt and a waterproof packing.

FIG. 5 is a cross-sectional view of a joined portion of the open annular belt.

FIG. 6 is a partial cross-sectional view showing a mounted state of the diameter expanding device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fume pipe 1a Damaged part 2 Open annular belt 2a, 2b Semi-annular belt 2d Packing fitting groove 2e Anchor insertion hole 2f Screw rod receiving part 3 Waterproof packing 4 Expander (turnbuckle) 4a Screw rod 4b Screw cylinder 5 Hole-in Anchor 6 nut

Claims (5)

[Claims] 1. A waterproof packing is fitted into a plurality of packing fitting grooves formed on the outer peripheral surface of a metal open ring belt, and both ends of the open ring belt are overlapped with each other to move the open ring belt from the inner diameter of the fume tube. At the same time as reducing the diameter so that it becomes smaller, attach an expanding tool that expands the open belt to the inside of the open belt,
After inserting this open belt to the part to be repaired in the fume tube, expand the open ring belt with the above-mentioned expanding tool and press it against the inner surface of the fume tube, and implant it in the fume tube through the anchor insertion hole of the open ring belt. A method for repairing a part of a fume tube, wherein a nut is screwed into a hole-in anchor that has been screwed from the inside of the open annular belt to fix the open annular belt. 2. A turnbuckle is used as a diameter-enlargement tool, and the tip ends of both threaded rods of the turnbuckle are engaged with threaded rod receiving portions formed on inner surfaces near both ends of the open annular belt. 2. The method according to claim 1, wherein a turnbuckle is mounted inside the open belt. 3. The partial repair of a fume tube according to claim 1, wherein a pair of semi-annular belts made of metal having excellent corrosion resistance are used as the open annular belt. Construction method. 4. A metal open annular belt having a waterproof packing fitted in a plurality of packing fitting grooves formed on an outer peripheral surface thereof is pressed against an inner surface of a portion of the fume tube to be repaired, and an anchor of the open annular belt is provided. A partial repair structure for a fume tube, wherein a hole-in anchor is implanted in the fume tube through the insertion hole, and a nut is screwed into the hole-in anchor from inside the open ring belt to fix the open ring belt. 5. The partial repair structure for a fume tube according to claim 4, wherein the open annular belt is formed by joining a pair of semi-annular belts made of metal having excellent corrosion resistance.