JP2950749B2 - Rubber tube for pipe repair - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber tube for repairing a pipe, in particular, a repair material is formed on an outer peripheral surface, and is inserted into a repair pipe to be expanded and brought into contact with the inner surface of the repair pipe to repair the pipe. And a rubber tube for pipe repair that is removed after the repair is completed.

[0002]

2. Description of the Related Art As a method of repairing a tear generated in a pipe buried in the soil such as a sewer pipe, a rubber tube having a repair material attached to an outer peripheral surface is put into the pipe, and the rubber tube is inflated and the repair material is used. There is a repair method that repairs the tube from the inside and removes the rubber tube when the repair is completed. This repair method can be repaired without digging up the soil or taking out the pipe, and it can be repaired without stopping the flow in the pipe such as sewage, so it is very easy and reliable repair It has the advantage of.

FIG. 2 is a sectional view for explaining the repair method. In the drawings, reference numeral 1 denotes a pipe to be repaired, for example, a sewer pipe. Reference numeral 2 denotes a rubber tube on which a repair material 3 is mounted on the outer peripheral surface. The repair material 3 is made of, for example, a reinforced resin applied to glass fiber. This reinforced resin has plasticity at first,
It is made of a material that cures over time (several hours to several tens of hours), and plays a role in closing the broken portion 11 of the tube 1 from its inner surface. The repair material 3 is formed on the outer peripheral surface of the rubber tube 2 by winding a glass fiber into a tubular shape, applying a reinforced resin, and attaching the reinforced resin to the outer peripheral surface of the rubber tube 2.

[0004] Reference numeral 4 denotes a temporary pipe through which liquid flowing through the pipe to be repaired 1 such as sewage flows during repair work. The temporary pipe 4 is made of, for example, a rubber tube with a wire and is inserted into the rubber tube 2. The temporary pipe 4 is not necessary if the liquid is allowed to be stopped during the repair work. 5 is the repaired pipe 1 and the temporary pipe 4
Is made of, for example, stainless steel, and has a shape in which the tip is bent outward and further folded inward, and the distal end of the temporary tube 4 is provided with a metal fastening band 6 at the rear end. It is tightened. Reference numeral 7 denotes the fastening fitting. The distal end of the rubber tube 2 is fastened to the folded portion by, for example, a metal fastening band 6a.

The rubber tube 2 is closed by the closing ring 5.
The space between the distal end and the distal end of the temporary tube 4 can be closed. The space between the rear end of the rubber tube 2 and the rear end of the temporary tube 4 is also closed (not shown). This closing may be performed using a closing ring substantially similar to the closing ring 5, or by directly tightening the rear end of the rubber tube 2 to the outer peripheral surface of the rear end of the temporary tube 4 using, for example, a tightening band. May be. Reference numeral 8 denotes an air passage formed in the closing ring 5, through which air is supplied from outside to inflate the rubber tube 2 by an air compressor.

The repair method will be described. First, the rubber tube 2 and the temporary tube 4 are assembled via a closing ring 5 and the like.
It is inserted into the portion to be repaired in the repaired tube 1, and the rubber tube 2 is externally supplied through the air opening 8.
The air is supplied to a space formed between the rubber tube 2 and the temporary tube 4 by an air compressor to expand the rubber tube 2. Then, the repair material 3 on the outer peripheral surface of the rubber tube 2 is pressed against the inner peripheral surface of the repair target tube 1 with a strong force by the pressure of the air. The reinforcing resin of the repair material 3 has plasticity at first, but hardens with the lapse of time, so that it adheres to the inner peripheral surface of the repair target tube 1 and further hardens, completely closing the inner peripheral surface of the repair target tube 1. Leakage is completely blocked. It takes several hours to several tens of hours to achieve such a state.

Thereafter, the air is released, and the pipe to be repaired 1
The rubber tube 2 is separated together with the temporary tube 4 and the like from the repair material 4 that covers and repairs the inner peripheral surface, and is collected from the repair target tube 1. Then, the damaged portion 11 of the repair target pipe 1 is repaired by the repair material 4. This completes the repair work.

[0008]

The conventional rubber tube 2 for repairing a pipe has a problem. That is, when air is supplied from the air passage 8 to inflate the rubber tube 2 for pipe repair, the rubber tube 2 does not only extend in the radial direction, but has a tip portion as shown by a two-dot chain line in FIG. The problem is that the air pressure increases and weakens easily and breaks easily. For this reason, it is very difficult to continue applying a sufficient pressure for several hours to several tens of hours, which is necessary to fix the repair material 3 on the inner peripheral surface of the repair target pipe 1, and it is unlikely that air will leak on the way and fail. Did not. Therefore, it was necessary to start over and over again. Therefore, we tried to increase the strength of the rubber tube 2 to prevent it from being damaged such as torn at the end. However, if it was too strong, the work required for repairing the rubber tube 2 to be sufficiently expanded by air would be smooth. The problem was not solved.

The present invention has been made in order to solve such a problem, and there is no possibility that the end is extended forward or backward by the pressure of air or the like for inflation, and the end is broken. It is an object of the present invention to provide a rubber tube for tube repair that can withstand a long time.

[0010]

According to a first aspect of the present invention, there is provided a rubber tube for repairing a pipe, which is reinforced by a reinforcing material having a reinforcing anisotropy which prevents expansion in an axial direction and allows expansion in a radial direction. .

[0011]

According to the rubber tube for tube repair according to the first aspect, since the reinforcing member is reinforced so as to prevent expansion and contraction in the axial direction, it expands forward or backward when inflated by supplying air. In addition, there is no fear that air is leaked due to breakage due to the elongation. Therefore, the repair work can proceed without any trouble, and the possibility of failure can be reduced. Nevertheless, since the reinforcing member does not suppress the elongation in the radial direction, there is no need to impede the operation of inflating the rubber tube and pressing the repair material on the outer peripheral surface against the inner peripheral surface of the repaired tube.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. FIG. 1 is a sectional view showing one embodiment of the present invention. This embodiment is largely different from the embodiment shown in FIG. 2 in that the rubber tube is reinforced with a reinforcing agent having a reinforcing anisotropy, but in other respects it is common, and Has already been described, the description is omitted, and only the differences are described in detail. In FIG.
2a is a rubber tube for repairing pipes according to one embodiment of the present invention, which is reinforced by a tough knitted cloth 10.
It is completely different from the conventional tube repair rubber tube 2.

Originally, the knitted fabric has high elasticity in the radial direction, but has low elasticity in the longitudinal direction. Therefore, the rubber tube 2a reinforced with the strong knitted fabric 10 exerts a strong force in the longitudinal direction. It hardly grows even if you receive it. However, elongation in the radial direction is acceptable. That is, the reinforcing direction is not isotropic but has anisotropy. Therefore, when the main tube repair rubber tube 2a is used, it hardly extends forward or backward when inflating by injecting air,
As a result, there is no danger that air will leak due to breakage due to the elongation. Therefore, the repair work can proceed without any trouble, and the possibility of failure can be reduced. Nevertheless, since the reinforcing member 10 does not suppress the elongation in the radial direction, there is no need to impede the operation of inflating the rubber tube 2a and pressing the repair material on the outer peripheral surface against the inner peripheral surface of the repaired tube.

In the rubber tube 2a, a rubber material is wound or applied to the surface of the mandrel, a knitted cloth 10 is attached to the surface of the rubber material, and then the rubber material is further wound or coated on the knitted cloth 10. It can be easily made by applying, then vulcanizing, and then removing the mandrel.

[0015]

According to the rubber tube for tube repair according to the first aspect, since the reinforcing member is reinforced so as to prevent expansion and contraction in the axial direction, it is necessary to inflate the tube by injecting air.
Alternatively, it does not extend backward, so that there is no risk that the elongation will cause breakage and air leakage. Therefore, the repair work can proceed without any trouble, and the possibility of failure can be reduced. Nevertheless, since the reinforcing member does not suppress the elongation in the radial direction, there is no need to impede the operation of inflating the rubber tube and pressing the repair material on the outer peripheral surface against the inner peripheral surface of the repaired tube.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention.

FIG. 2 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Repaired pipe 2a Rubber tube for pipe repair 3 Repair material 10 Reinforcement material

Claims (1)

(57) [Claims] A repair material is formed on an outer peripheral surface of a pipe to be repaired, and is inserted into the pipe to be repaired and expanded to bring the repair material into contact with an inner surface of the pipe to be repaired, thereby enabling repair and removing the pipe after the repair is completed. A rubber tube for pipe repair, wherein the rubber tube is reinforced by a reinforcing material having a reinforcing anisotropy that prevents expansion in an axial direction and allows expansion in a radial direction.