JPH09329277A - Water cutoff flexible coupling and mounting method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water cutoff flexible coupling to provide a stable watertight property and to provide a mounting method thereof. SOLUTION: In a water cutoff flexible coupling used for insertion of a pipe 2 in a mounting hole formed in a manhole body 1 and connection therebetween, a water cutoff flexible coupling body 12 is formed of a material having elasticity and formed in a shape consisting of a cylinder part 13 making contact with a manhole drilled surface 3; a cylinder part 15 making contact with the pipe 2; and a conical coupling part 14 to interconnect the two cylinder parts. A sealant 11 is arranged at the cylinder part 13 on the manhole drilled surface side of a coupling body 12, and a water cutoff protrusion 10 is formed on one side or both sides of the sealant 11. By expanding an expansion band 16 arranged on the inner peripheral surface of the cylinder part of the back of the sealant, the cutoff protrusion 10 and the sealant 11 are contact-bonded to the manhole drilled surface 3 and the sealant 11 is contact-bonded to the cutoff protrusion 10 and deformed enough to prevent the occurrence of protrusion and effects cutoff.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-stop flexible joint for connecting a manhole and a pipe for sewage and the like, and a method for attaching a water-stop flexible joint for attaching the water-stop flexible joint to a manhole.

[0002]

2. Description of the Related Art Conventionally, a connecting portion between a manhole and a pipe is
A concrete winding method, as shown in Fig. 6, in which the connection part is filled with mortar or concrete to stop water, is the mainstream. In FIG. 6, 51 is a manhole, 52 is a pipe,
Reference numeral 53 is a drilled surface, and 54 is concrete. However, the above-described winding method has a drawback that water leakage due to cracking of concrete or intrusion of unknown water easily occurs while waiting for the concrete to harden.

[0003] In contrast to this concrete winding method, even if the relative positional relationship between the manhole and the pipe is displaced due to displacement of the ground, etc., it is a waterproof joint made of rubber or soft plastic that has flexibility and can follow the displacement. Is also proposed. 7 and 8 show an example of such a water-stop flexible joint. The water-proof flexible joint as shown in FIGS. 7 (a) and 7 (b) is a method in which the special expansion ring 55 and the special jack 56 are used to always expand the expansion ring 55 to the same expansion length and mechanically attach it. is there. A water-proof flexible joint as shown in FIG. 8 is similarly mechanically attached by an expansion ring 58. However, a sealing material 57 is arranged on the outer peripheral surface of a water-proof flexible joint main body 59 so that the sealing material is expanded at the time of expansion. This is a method of increasing water tightness by compressing and deforming 57 together with the water stop flexible joint body 59 to fill and seal the irregularities of the drilled surface 53 of the manhole 51.

[0004]

In the method shown in FIG. 7 in which the expansion length is always the same and the mechanical attachment is performed, the manhole 51 has a different drilling diameter depending on the hole saw diameter of the drilling jig and the drilling method. Since there is a large variation, if the drilling diameter is larger than the setting and the fixing is always fixed with the same extension length, the set compression amount may not be reached, and there is a risk that the groundwater will not be able to withstand the water pressure and may enter. Even if the standard drilling diameter is set, if the concrete surface of the drilling surface has irregularities or steps, a waterproof projection such as rubber is provided on the outer circumferential surface of the water-proof flexible joint body 59 and the expansion band 55 is used. Even if it is compressed and deformed, there is a problem that water easily penetrates through the gaps between the uneven portion and the step portion.

On the other hand, in the type shown in FIG. 8 in which the sealing material 57 is arranged to improve the water tightness, the water-sealing flexible joint main body 59 and the sealing material 57 are compressed and deformed by the compressive stress of the expansion ring 58. Since the material 57 continues to be deformed by the compressive stress of the expansion ring due to the plastic deformation, the compressive stress is lowered, and the material 57 is pushed into the manhole by the earth pressure after the burying, and there is a risk that the material 57 comes off the drilled surface 53 and the groundwater or the like enters. . In general, the seal material 57 has high temperature sensitivity, and particularly in summer, the seal material is easily softened and easily deformed when expanded and acts as a lubricant, so that the joint body slides on the seal material surface and the joint body partly slips. There was also a risk that it would come off the drilled surface.

An object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide a water tight flexible joint that can obtain stable water tightness and a method for mounting the joint.

[0007]

A water-stop flexible joint of the present invention is a water-stop flexible joint used for inserting and connecting a pipe into a mounting hole formed in a manhole body. The main body is made of an elastic material and has a cylindrical portion in contact with the manhole drilling surface, a cylindrical portion in contact with the pipe, and a conical connecting portion connecting the two cylindrical portions. A sealing material is placed on the outer periphery of the manhole drilling surface side cylindrical portion of the flexible joint body, and a water blocking protrusion is provided on one or both sides of the sealing material, and the expansion band provided on the inner surface of the cylindrical portion on the back of the sealing material is expanded. By doing so, the water blocking projections and the sealing material are pressure-bonded to the manhole drilling surface, and the sealing material is pressure-bonded and deformed to the extent that the water blocking projections do not protrude, thereby stopping water.

The method of mounting the waterproof flexible joint according to the present invention is the same as the method of mounting the waterproof flexible joint of the above structure, after the outer peripheral portion of the waterproof flexible joint body is aligned with the manhole drilling surface, Extend the expansion band to the specified hydraulic pressure with an expansion device equipped with a hydraulic gauge, select the stopper with the optimal shape according to the scale at the time of expansion, insert the stopper between the guide and the expansion fixing member, and then unload it. The expansion device is removed, and the water-proof flexible joint body is crimped and fixed to the manhole drilling surface.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are cross-sectional views showing a state in which the waterproof flexible joint of the present invention is attached to a drilled surface of a manhole. FIG. 2 shows a type in which the water-proof flexible joint body 12 is attached to the drilled surface 3 of the manhole 1 from the outside, and FIG. 1 shows a type to be installed from the inside.

In the example shown in FIG. 1, the expansion band 16 is expanded so that the drilling side cylindrical portion 13 of the water-proof flexible joint body 12,
The water blocking projections 10 and the sealing material 11 are attached by being compressed and fixed to the drilled surface 3 of the manhole 1. The pipe 2 is passed through the pipe side cylindrical portion 15 of the waterproof flexible joint body 12 and is fixed to the waterproof flexible joint body 12 by a fastening band 25. The drilling side cylindrical portion 13 and the pipe side cylindrical portion 15 are connected by a connecting portion 14. Then, the water-stop projection 10 and the drilled side cylindrical portion 1
3, the connecting portion 14 and the pipe-side cylindrical portion 15 form the water-stop flexible joint body 12.

In the example shown in FIG. 2, the water stop protrusions 18a, 18
b is made of water-expandable rubber, and the lower part is connected and integrated so that the sealing material 11 is arranged between the protrusions 18a and 18b. As shown in FIG. 2, the water-blocking flexible joint body 12 is made of water-expandable rubber.
When it is not possible to mold it integrally with and it is necessary to produce it by laminating it together, it is easier to produce if the lower part of the water-expandable rubber is connected. In the example shown in FIG. 2, reference numeral 17 is an extension band, and other configurations are the same as those in the example shown in FIG.

In any of the examples, as the elastic body constituting the water-stop flexible joint body 12, synthetic rubber such as styrene-butadiene rubber, EPDM, chloroprene, natural rubber and soft vinyl chloride resin, vinyl chloride elastomer, It can be selected from styrene-based thermoplastic elastomers and the like. The water-expandable rubber forming the water-stop projections 18a and 18b is formed by vulcanizing and molding the above-mentioned natural rubber or synthetic rubber with a water-expandable resin and other additives. The shape of the sealing material 11 is such that the waterproof projections 10, 18a, 1
It is calculated or actually measured from the shape, hardness, compression amount, etc. of 8b, and its material is preferably a butyl type or a water expansion type which is excellent in watertightness. The materials for the expansion bands 16 and 17 and their accessories that require rigidity are metals such as stainless steel, aluminum, rust-proof plated steel, and rust-proof coated steel, or vinyl chloride resin, ABS resin, hard plastic such as polyethylene terephthalate, or FRP. It is possible to use plastic reinforced by fibers such as. Each of these materials is desirable because it is resistant to corrosion. Also, expansion band 1
When high strength is required for 6, 17, it is preferable to perform a bending process with a U-shaped cross section like the expansion band 16 shown in FIG.

According to the waterproof flexible joint of the present invention shown in FIGS. 1 and 2, the waterproof flexible joint body 12 is made of an elastic material and is in contact with the drilled surface 3 of the manhole 1.
3, a cylindrical portion 15 in contact with the pipe 2, and the two cylindrical portions 1
Although it has a shape having a conical connecting portion 14 that connects 3 and 15, the manhole drilling diameter is usually 5 than the diameter of the pipe 2.
Since the opening is made large by about 0 mm to 100 mm, the pipe 2 has a conical elastic connecting portion that connects the drilled surface 3 of the pipe 2.
Even if displacement occurs, it is deformed and can follow the displacement.

A sealing member 11 having water-stop projections 10, 18a, 18b on one or both sides is arranged in a cylindrical portion 13 of a water-stop flexible joint body 12 which is in contact with the drilled surface 3 of the manhole 1, and an expansion band 16 is provided. , 17 manhole drilling surface 3
When attaching the, the water stop projections 10, 18a, 18b of the elastic body
Is compressed and deformed to exert a water blocking effect by the packing effect, but the sealing material 11 is also compressed and deformed and filled in the irregularities of the manhole drilling surface 3 to exert watertightness by the sealing effect. At this time, if the sealing material 11 protrudes from the water blocking projections 10, 18a, 18b, it becomes the same as when the sealing material 11 like the conventional example shown in FIG. 8 is simply pasted, resulting in a decrease in compressive stress and slippage of the joint body. The above-mentioned trouble occurs. When the water-stop projections 10, 18a, 18b are made of water-expandable rubber,
Watertightness is further enhanced by the packing effect and water expansion pressure.

FIG. 3 is a diagram showing the structure of the extension band 17. The configuration of the extension band 16 is also the same as that of the extension band 16 except that the cross section is U-shaped. In FIG. 3, the expansion device expands the space between the expansion locking portions 21a and 21b, and the stopper 19 is inserted and fixed between the plate-shaped guide 20 and the expansion fixing member 24. In addition, the part of X mark shows the part fixed by welding.

Explaining the expansion band 17 shown in FIG. 3 in more detail, the ring-shaped expansion band 17 is cut at one location on the circumference thereof, and one of the cut portions 23 is provided with a plate-shaped guide 20 extending to the other. The expansion fixing member 24 is provided on the other side, and the graduations 22 at equal intervals are provided on the inner circumferential surface of the band between the plate-shaped guide 20 and the expansion fixing member 24, and expanded with the optimum expansion force. At this point, the stopper 19 having the optimum shape can be easily selected according to the scale. As the hole diameter increases by 1 mm, the circumference increases by 3.14 mm, so 4 to 5 types of stoppers 19 are prepared in consideration of the variation in hole diameter, and the scales 22 have a length of about 2 mm from the expansion fixing member 24 as a starting point. Is displayed.
Then, by reading the display at the time of expansion with the optimum expansion force designed from the required compression rate, and selecting and inserting the stopper 19 that is closest to the number, stable attachment that absorbs the variations in manhole drilling diameter becomes possible. In addition, 27 is a cutting part 23
It is a cover that covers the cutting portion 23 attached to one side.

FIG. 4 is a schematic view showing a method of expanding and attaching an expansion band with an expansion device. In FIG. 4, the expansion band 17 is aligned with the drilling side cylindrical portion 13 of the waterproof flexible joint body 12 in which the manhole drilling surface is preset, and the claws 35a and 35b at the tip of the expansion device 31 are connected to the expansion band 1.
7 extended locking portions 21a and 21b. In this state, the piston of the hydraulic jack 34 is pushed up by using the hydraulic pump 32, the tabs 35a and 35b at the tips are expanded, and the expansion band 17 is expanded. By expanding the expansion band 17, the drilling side cylindrical portion 13 of the water-proof flexible joint body 12 is expanded.
The water stop projections 10, 18a, 18b and the sealing material 11 are compressed.

Since the compression amount is proportional to the expansion force, the set compression amount can be realized by raising the indication value of the hydraulic gauge 33 attached to the hydraulic pump 32 to the target value obtained by measurement or the like. When the hydraulic gauge 33 rises to a prescribed value, the expansion by the expansion device 31 is stopped, and the scale 22 provided between the guide 20 and the expansion fixing portion 24 at that time is read. After selecting and inserting the stopper 19 having the shape closest to the read value, the hydraulic pressure of the expansion device 31 is unloaded, the expansion device 31 is removed, and the work of attaching the water-stop flexible joint to the manhole hole is completed. . The scale 22 may be displayed in different colors in addition to the numbers.

As is clear from the above description, according to the present invention, even if there is a variation in the diameter of the manhole drilled, the expansion band equipped with a hydraulic gauge is used to expand the expansion band to a constant pressure to stop the water. The protrusion or sealing material can be compressed to the desired compression amount, at which point the optimal stopper is selected from the scale provided between the plate-shaped guide and the expansion fixing member, and after inserting the stopper the load is removed and the expansion band is fixed. As a result, a constant amount of compression can be obtained irrespective of variations in hole diameter, and stable watertightness can be obtained.

When the expansion band is used for expansion, the water blocking projections provided on one or both sides of the sealing material are first compressed.
Since the water-stop projection is an elastic body of rubber or soft plastic, the stress against compression is higher than that of the seal material, and unlike the seal material, plastic deformation does not continue due to residual compressive stress.
A stable optimum expansion stress can be obtained. The sealing material is also compressed and deformed together with the water blocking projections, but it is designed so that it does not protrude into the water blocking projections, and fills the irregularities and steps of the drilled surface and exerts water blocking performance. The water-stop projection is compressed by the expansion band on the drilled surface and exhibits water-stopping effect due to the packing effect, but by using water-expansion rubber for the water-stop projection, in addition to the packing effect, the water-stopping effect due to water expansion pressure can also be exhibited. .

[0021]

EXAMPLE As shown schematically in FIG. 5, manhole 1
The connection structure of the example of the present invention and the conventional example in which the pipe 2 (52) is attached to the hole of (51) using the waterproof flexible joint body 12 (59) is installed using the jack 43. The test container 40 was set at the end. Then, as shown by the arrow A, water is supplied to the test container 40, and the water pressure is 1 kgf / cm.
It was confirmed whether or not water leaked in ² minutes for 3 minutes. Tube 2 (5
2) is a vinyl chloride pipe with a nominal diameter of 200 mm, manhole 1
(51) is diameter 30 as standard drilling diameter for No. 1 manhole
4 mm and 3 mm larger diameter 307 mm are used. As the water-stop flexible joint, the water-stop flexible joint body has a constant expansion length type shown in FIG. 7 and a sealing material coating type shown in FIG. The outer mounting type of the present invention shown in 2 was used. Regarding the joint of the present invention shown in FIG. 2, the central axis of the pipe 2 was displaced by an angle θ as shown in FIG. 5, and the water leakage test was conducted in this state.

As a result, the constant expansion length type shown in FIG. 7 has a standard boring diameter of 304 mm, and is 1 kgf / cm ^2.
Water leakage did not occur within 3 minutes of water pressure, but the hole diameter was 307
intended mm water leakage at 0.5 kgf / cm ² water pressure occurs. In the seal material coating type of FIG. 8, the standard drilling diameter is 30
With a water pressure of 4 mm and a water pressure of 0.5 kgf / cm ² , the joint body was pressed by the water pressure, slippage occurred between the seal material and the drilled surface, and water leakage occurred from the part where it dropped off. The fitting of the present invention shown in FIG. 2 was mounted at a standard drilling diameter of 304 mm at a hydraulic gauge reading of 70 kgf / cm ² , and at a drilling diameter of 307 mm with a spacer replaced and at a hydraulic gauge reading of 70 kgf / cm ² . However, in all cases, no water leakage occurred within 3 minutes at a water pressure of 1 kgf / cm ² . Also, with this test piece having a drilled hole diameter of 307 mm, the pipe was continuously tilted at 15 ° and 3 kg at 1 kgf / cm ² .
Water pressure was applied for a minute, but no water leakage was observed even in this case.

[0023]

As is clear from the above description, according to the present invention, the sealing material provided on the outer peripheral surface of the joint body and the water-stop projection have stable compressive stress and watertightness, and the manhole drilling diameter varies. Even if occurs, by expanding the expansion band to the specified hydraulic pressure with an expansion device equipped with a hydraulic gauge, selecting the optimum stopper on the scale, inserting and fixing it, a uniform compression rate can always be obtained, so it is stable. Watertightness can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a mounted state of a waterproof flexible joint as one embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a mounted state of a water-proof flexible joint which is another embodiment of the present invention.

FIG. 3 is a cross-sectional view showing an example of the expansion band of the present invention.

FIG. 4 is a diagram for explaining a state in which the expansion band of the present invention is expanded by an expansion device.

FIG. 5 is a diagram showing an example of a water stop test device for a water stop flexible joint.

FIG. 6 is a cross-sectional view of a conventional connection structure by concrete winding.

FIG. 7 is a view showing a front surface and a mounting cross section of a conventional flexible joint.

FIG. 8 is a mounting cross-sectional view of another conventional flexible joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Manhole 2 Pipe 3 Drilling surface 10 Water stop projection 11 Sealing material 12 Water blocking flexible joint body 13 Drilling side cylindrical part 14 Connection part 15 Tube side cylindrical part 16, 17 Expansion band 18a, 18b Water blocking projection 19 Stopper 21a , 21b Expansion locking part 22 Scale 23 Cutting part 24 Expansion fixing member 25 Fastening band 31 Expansion device 32 Hydraulic pump 33 Hydraulic gauge 34 Hydraulic jack 35a, 35b Claw

Claims (4)

[Claims] 1. A waterproof flexible joint used for inserting and connecting a pipe into a mounting hole drilled in a manhole body, wherein the waterproof flexible joint body is made of an elastic material and has a manhole drilling surface. It has a shape having a contacting cylindrical portion, a cylindrical portion in contact with the pipe, and a conical connecting portion connecting the two cylindrical portions, and the outer peripheral portion of the manhole drilling surface side cylindrical portion of the water-stopping flexible joint body. The sealing material is placed on the seal material, and the water blocking projection is provided on one or both sides of the sealing material. A water-proof flexible joint characterized in that the sealing material is crimped and deformed to such an extent that it does not protrude into the water-stopping projections. 2. The expansion band is a ring-shaped band having rigidity, and is cut at one location on the circumference in a direction perpendicular to the ring surface, and one end is formed on the inner circumferential surface of one band end of the cut location. Is provided, and a plate-shaped guide extending along the inner circumference of the band and extending to the other end beyond the expanded width of the cut portion is provided, and an expansion fixing member is provided on the inner peripheral surface of the other end of the band. The scales at equal intervals are provided on the inner peripheral surface of the expansion band between the expansion fixing member and the optimum stopper can be easily selected by the scales when expanded by the optimum expansion force. Water-stop flexible joint. 3. The water-stop flexible joint according to claim 1, wherein the water-stop projection is made of water-expandable rubber. 4. The method for mounting the water-stop flexible joint according to claim 1, wherein after fitting the outer peripheral portion of the water-stop flexible joint body to the manhole drilling surface, the hydraulic gauge is attached. Expand the expansion band to the specified hydraulic pressure with the bonded expansion device, select the stopper with the optimal shape according to the scale when expanding, insert the stopper between the guide and the expansion fixing member, and then unload the expansion device. A method of mounting a waterproof flexible joint, characterized by removing and fixing the waterproof flexible joint body to the drilled surface of the manhole by crimping.