JPH0346317Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a water stop band, especially the step between the end of a synthetic resin pipe that is manufactured in close contact with an existing tubular part and the inner wall of an existing tubular part. It relates to something that prevents fluid from entering or leaking at certain boundary areas.

[Prior Art] FIG. 10 is a sectional view showing a conventional water stop band in use, and FIG. 11 is a sectional view taken along line BB in FIG. 10. In the figure, 1 is a rubber ring having two ribs 1c provided at appropriate intervals on its outer circumferential surface, and 2 is a steel band that presses and fixes the rubber ring 1 to an existing tubular member 3.

The conventional water stop band is constructed as described above, and the outer peripheral surface of the rubber ring 1 having the ribs 1c is brought into contact with the leakage part 3a which is the target of water stop due to, for example, a crack in the existing tubular member 3. After that, a hydraulic jack is installed inside the existing tubular member 3, and the steel band 2 is positioned by the hydraulic jack.
is extended in the circumferential direction, and the rubber ring 1 is pressed against the inner wall of the existing tubular member 3. Then, the ribs 1c provided on the outer peripheral surface of the rubber ring 1 that are in contact with the inner wall of the existing tubular object 3 are crushed, the leakage portion 3a of the existing tubular object 3 is closed, and water is stopped. In this way, the steel band 2 is stretched in the circumferential direction,
After sealing the leakage part 3a in the existing tubular material 3,
Insert a spacer into the gap between both ends of the steel band 2,
The spacer and both ends of the steel band 2 are screwed together with bolts to connect both ends of the steel band 2. After that, the hydraulic jack is taken out from inside the existing tubular object 3, and the installation work of the water stop band inside the existing tubular object 3 is completed.

If the existing pipe 3 is for water supply or sewerage, the leakage part 3a is a cracked part such as a pipe joint with a gap or a crack, and even if underground water enters from there or the contents leak, the leakage part 3a The water is stopped by closing it with the rubber ring 1 of the water stop band.

[Problem to be solved by the invention] In the conventional water-stop band as described above, the rubber ring 1 only has two ribs 1c extending in the circumferential direction on its planar, step-free outer peripheral surface. Therefore, it can be used for the existing tubular object 3a, but it can be used for leakage parts in the stepped part of the inner wall of the existing tubular object 3, for example, between the inner wall of the existing tubular object 3 and the end of the synthetic resin pipe lined within the existing tubular object. There was a problem that it could not be used at the border. In addition, even if the leakage part 3a of the existing tubular material 3 is a flat inner wall, if the leakage part 3a is displaced during use due to flattening of the pipe due to earthquakes, wheel loads, etc. The rubber ring 1 having an outer circumferential surface with no level difference cannot solve the problem and cannot prevent water from entering or leaking. Furthermore, over a long period of time, the rubber ring 1
When using the rubber ring, the elasticity of the ribs weakens due to deterioration, and a gap is created in the leakage part 3a that is blocked by the rubber ring 1, which deteriorates the water-stopping properties of the rubber ring 1 and causes water intrusion and leakage. There was also the problem of the

This idea was made to solve this problem, and even if there is a leakage part with a step on the inner wall of an existing pipe, it can prevent fluid intrusion and water leakage, and it can prevent fluid intrusion and water leakage over a long period of time. The purpose is to obtain a water stop band that can ensure the prevention of water leakage.

[Means for Solving the Problems] The water stop band according to this invention includes a rubber ring in which a water stop member in which water-swellable rubber is sandwiched is provided on the outer peripheral surface of two consecutive rubber ring bodies. ,
In a water stop band consisting of a metal band that presses the inner peripheral surface of each rubber ring body toward the inner wall surface of the existing pipe and press-fits each rubber ring body to the inner wall of the existing pipe when both ends are connected, the rubber ring The two rubber ring bodies have at least different outer diameters, and the water stop member is two circumferentially extending ribs provided on the outer peripheral surface of each rubber ring body at appropriate intervals.

[Function] In this invention, the rubber ring is formed by providing at least two ribs extending in the circumferential direction on the outer circumferential surface at appropriate intervals, and by arranging at least two rubber ring bodies having different outer diameters. Therefore, the outer circumferential surface of the rubber ring has a sufficient width and comes into contact with a leakage part with a step difference in an existing tubular object without creating a gap, so that the leakage part with a step difference can be reliably closed. .

[Example] Figure 1 is a partial sectional view showing an example of this invention, Figure 2 is an explanatory diagram showing how to attach a steel band to an existing tubular object, and Figure 3 is a diagram showing a method of attaching a steel band to an existing tubular object. A cross-sectional view showing the state in which the bracket and the steel band are connected, Fig. 4 is a perspective view showing the state before the bracket is connected to the steel band, and Fig. 5 shows the state in which the water stop band is attached to the existing pipe. 6 is a sectional view taken along the line A--A in FIG. 5, FIG. 7 is a perspective view showing how both ends of the steel band are connected, and FIG. 8 is a perspective view showing the spacer. In the figure, 1 is a rubber ring made up of two rubber ring bodies 1a and 1b having different outer diameters, and 1c is each rubber ring body 1.
Ribs extending in the circumferential direction are provided at appropriate intervals on the outer peripheral surfaces of a and 1b, 2 is a steel band that presses and fixes the rubber ring 1 to the existing tubular object 3, and 2a is on both ends of the steel band 2. A plurality of bracket locking holes are respectively formed, 4 is a fall prevention cover provided by welding on both ends of the steel band 2, 4a is a bolt through hole provided in one fall prevention cover 4, 4b is a bolt hole provided in the other fall prevention cover 4, 5 is each rubber ring body 1a,
A water-swellable rubber belt fitted between the ribs 1c of 1b, made of water-swellable rubber such as chloroprene rubber kneaded with a durable polymer absorbent having a thickness expansion rate of 30% or more in a water environment. It is made of water-swellable synthetic resin sheet, etc. 6 is steel band 2
A spacer 6a is used to connect both ends of the spacer 6, and a bolt fixing hole 6a is provided at one end of the spacer 6.
b is an elongated notch groove provided at the other end of the spacer 6 and extending in the longitudinal direction.

A method of using the water stop band configured as described above will be explained.

First, the leakage part 3a of the existing tubular object 3 in which the water stop band of this embodiment is used will be explained.

The interior of the existing tubular material 3 is lined with a synthetic resin pipe 7 by various known methods in order to restore the deteriorated pipe function due to physical and chemical deterioration of the existing tubular material 3. However, when the synthetic resin 7 is made into a tube by thermosetting, a void 8 is created between the existing tubular object 3 and the synthetic resin pipe 7 due to volumetric contraction, so the inner wall of the existing tubular object 3 and the gap 8 from the stepped boundary between
Groundwater that has entered through the pipe enters into the existing tubular material 3, and contents such as water within the existing tubular material 3 enters the void 8 from the boundary portion, so that the boundary portion becomes a leakage portion 3a.

Therefore, in order to watertight this leakage part 3a, first, the outer circumferential surface of the rubber ring 1, which is made up of two rubber ring bodies 1a and 1b having different outer diameters arranged in series at the boundary part with a step, which is the leakage part 3a. Position by bringing them into contact. At this time, the rib 1c of each rubber ring body 1
A water-expandable rubber belt 5 is fitted in advance between them. Thereafter, a hydraulic jack 10 having brackets 9 at both ends is installed at the position where the rubber ring 1 is positioned within the existing tubular member 3, as shown in FIG. The hydraulic jack 10 is extended by being inserted and locked into the bracket locking holes 2a formed at both ends of the bracket. Then, the steel band 2 is expanded in the circumferential direction by the hydraulic jack 10 and comes into contact with the inner peripheral surface of the rubber ring 1, thereby pressing the rubber ring 1 toward the inner wall of the existing tubular member 3. Then, the rubber ring body 1a that is in contact with the inner wall of the existing tubular object 3 and the existing tubular object 3
The rib 1c provided on the outer peripheral surface of the rubber ring body 1b connected to the inner wall of the end of the synthetic resin pipe 7 lined inside is crushed, and the leakage part 3a with the step of the existing tubular object 3 is blocked. be done. That is, the entrance and exit of the gap 8 created between the inner wall of the existing tubular object 3 and the outer circumferential surface of the end of the synthetic resin 7 is closed, and water is stopped. In this way, after extending the steel band 2 in the circumferential direction and closing the leakage part 3a of the existing tubular object 3, the fall prevention cover 4 and the rubber ring 1 provided at both ends of the steel band 2 are removed. A spacer 6 is inserted into the gap created between the inner circumferential surface of the First, one end of the steel band 2 is fixed by screwing the fixing bolt 11 that passed through the bolt through hole 4a of the falling prevention cover 4 into the bolt fixing hole 6a of the spacer 6, and then into the notch groove 6b of the spacer 6. The ends of the adjustment bolts 12 screwed into the bolt holes 4b of the fall prevention cover 4 are engaged to connect both ends of the steel band 2. At this time, since the notch groove 6b of the spacer 6 is in the shape of a long and narrow hole, displacement of the steel band 2 in the width direction is prevented. After that, the hydraulic jack 10 is retracted and the bracket 9 locks into the bracket locking hole 2 of the steel band 2.
a, and the hydraulic jack 10 is taken out from inside the existing tubular object 3, and the installation work of the water stop band inside the existing tubular object 3 is completed.

In this way, the leakage portion 3a of the existing tubular material 3
For example, even if the leakage part 3a has a step at the boundary between the inner wall of the existing tubular object 3 and the outer circumferential surface of the end of the synthetic resin pipe 7 lined within the existing tubular object 3, the rubber ring 1 is attached to the outer circumferential surface. Since at least two ribs 1c extending in the circumferential direction are provided at appropriate intervals and two rubber ring bodies 1a and 1b having different outer diameters are arranged in series, there is no step difference in the inner wall portion of the existing tubular member 3. The outer peripheral surface of the rubber ring 1 has a sufficient width and comes into contact with a certain leakage part 3a without creating a gap to reliably close the leakage part 3a with a step, so that sufficient water stoppage is achieved. It will be done. In addition, when the inner wall of the existing tubular object 3 is a planar leakage part 3a without a step, each rubber ring body 1a, 1b of the steel band 2
By adjusting the pressing force against the leakage part 3a of the existing tubular member 3, water can be stopped even if the leakage part 3a is flat.

In addition, each rubber ring body 1a, 1 of the rubber ring 1
Since the water-expandable rubber belt 5 is fitted between the ribs 1c of b, the leakage part 3a will not shift due to flattening of the pipe due to earthquakes or wheel loads during use.
Even if a gap is formed in the leakage part 3a due to the deterioration of the rubber ring due to the deterioration of the rubber ring due to long-term use, the water-expandable belt will not be damaged by water entering from outside the pipe or water leaking from inside the pipe. 5 undergoes an expansion reaction and expands, filling gaps and gaps created in the leakage portion 3a of the existing tubular object 3 and closing the leakage portion 3a, thereby maintaining water stoppage.

FIG. 9 is a partial sectional view showing another embodiment of this invention. In the rubber ring 1 of this embodiment, the two rubber ring bodies 1a and 1b not only have different outer diameters, but also different inner diameters and the same thickness, and other configurations are the same as in the previous embodiment. The rubber ring 1 of this embodiment can be applied regardless of whether the leakage portion 3a has a step or a planar shape.

[Effects of the invention] As explained above, in this invention, a rubber ring is provided with at least two ribs extending in the circumferential direction on the outer peripheral surface thereof at appropriate intervals, and at least two rubber ring bodies having different outer diameters are arranged in series. The outer circumferential surface of the rubber ring has sufficient width and pressure to contact without creating any gaps, even if there is a step in the leakage part of the existing tubular part. It has the effect of being able to block water and stop water.

[Brief explanation of the drawing]

Figure 1 is a partial sectional view showing an embodiment of this invention, Figure 2 is an explanatory diagram showing how to attach a steel band to an existing tubular object, and Figure 3 is a bracket and steel band attached to a hydraulic jack. Fig. 4 is a perspective view showing the state before the bracket is connected to the steel band, Fig. 5 is a sectional view showing the state in which the water stop band is attached to the existing pipe, Fig. 6 The figure is a cross-sectional view taken along the line A-A in Figure 5, Figure 7 is a perspective view showing how both ends of the steel band are connected, Figure 8 is a perspective view showing the spacer, and Figure 9 is another example of this invention. FIG. 10 is a sectional view showing a conventional water stop band in use, and FIG. 11 is a sectional view taken along line BB in FIG. 10. 1...Rubber ring, 1a, 1b...Rubber ring body, 1c...Rib, 2...Steel band, 3...Existing tubular object, 5...Water-expandable rubber belt.

Claims (1)

[Scope of Claim for Utility Model Registration] A rubber ring comprising two rubber ring bodies arranged in series, each provided with a water-stopping member sandwiching water-swellable rubber on the outer circumferential surface, and the inner circumferential surface of each rubber ring body. and a metal band that presses against the inner wall surface of the existing pipe and press-fixes each rubber ring body to the inner wall of the existing pipe when both ends are connected, wherein the two rubber ring bodies of the rubber ring are at least A water stop band characterized in that the water stop members are two ribs extending in the circumferential direction and having different outer diameters and provided on the outer peripheral surface of each rubber ring body at appropriate intervals.