JPH0557035U - Water stop material - Google Patents

Abstract

(57) [Summary] [Purpose] When joining a manhole wall and a sewer pipe such as a fume pipe, a vinyl chloride pipe, or a ceramic pipe, the construction can be simplified and the sewer construction site can be quickly backfilled. Therefore, it is possible to cope with uneven settlement and to maintain the water stopping performance for a long period of time. [Structure] The water blocking material 1 is installed between the outer peripheral surface of the sewer pipe 5 and the wall surface through hole 6 of the concrete manhole. An annular protrusion and an annular groove 2h are formed on the inner peripheral surface of the annular body 2 made of vulcanized rubber. Annular projections 2e, 2f, 2g and grooves 2i are formed on the outer peripheral surface of the annular body 2. The ring-shaped water expansion members 3A, 3B made of water-expanded rubber are fixed in the ring-shaped grooves 2h, 2i, respectively. The water stop material 1 is fitted into the outer peripheral surface of the sewer pipe 5, and the sewer pipe 5 is inserted into the wall surface through hole 6. Each annular protrusion of the water blocking material 1 is compressed and deformed.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a water blocking material that can be used at a joint between a prefabricated concrete manhole and a sewer pipe.

[0002]

[Prior Art]

 There are several known methods for joining manholes to fume pipes, vinyl chloride pipes, ceramic pipes, and other sewer pipes. First, a through hole with an inner diameter larger than the outer diameter of the sewer pipe is opened in advance on the outer wall of the manhole, a pipe is attached to this through hole, and mortar is driven in to eliminate the gap between the manhole and the sewer pipe. There is a way to do it. However, in this method, the manhole and the mortar are different in material, and the mortar and the pipe are different in material. In addition, since the manhole and sewer pipes have different basic shapes and different loads, the amount of subsidence after backfilling is different and uneven subsidence occurs. As a result, the force is concentrated on the sewer pipe near the manhole joint and the pipe is damaged. Moreover, since it takes time for the mortar to harden, it cannot be backfilled early. Therefore, it causes traffic congestion and congestion, and the sewer construction site is dangerous.

In addition, there is a method in which a water-expanding waterproof material is attached to the inner peripheral surface of the through hole of the manhole, a water-expanding rubber is attached to the conduit, and a special bond or non-shrink mortar is filled in the gap between the two. is there. As a result, the waterproofness is improved and the displacement load is relieved. However, on-site work is very time-consuming and can only be backfilled after the mortar has hardened.

Further, there is a method of using a tubular joint material with a flange, fixing the wall surface of the manhole and the joint material with an adhesive or an anchor bolt, and tightening the conduit and the joint material with a band or the like. However, if water is attached to the wall surface of the manhole, the joint material will not adhere and the waterproof performance will be significantly reduced. Also, it takes a lot of time and effort to attach the joint material.

[0005]

[Problems to be solved by the device]

 The object of the present invention is to provide a waterproof material that can be easily installed, can quickly backfill the sewer construction site, can cope with uneven settlement, and can maintain its waterproof performance for a long period of time. Is to provide.

[0006]

[Means for Solving the Problems]

 The present invention is a waterproofing material to be installed between the outer peripheral surface of a sewer pipe and the wall through-hole of a concrete manhole, which has annular projections and grooves on the inner peripheral surface and the outer peripheral surface, respectively. An annular body made of vulcanized rubber, a water expansion material made of water-expanded rubber fixed to the groove on the inner peripheral surface of the annular body, and fixed to the groove formed on the outer peripheral surface of the annular body. The present invention relates to a waterproof material having an annular water expansion material made of water expansion rubber.

[0007]

【Example】

 1 is a cross-sectional view in the width direction of a water blocking material 1 according to an embodiment of the present invention, and FIG. 2 is a front view of the water blocking material 1 (viewed from the right side in FIG. 1). The water stop material 1 has an annular shape as a whole. The annular body 2 of the water blocking material 1 has a complicated shape. Specifically, the annular small projections 2a, 2b, 2c, 2d are also formed on the inner peripheral surface of the annular body 2. On the outer peripheral surface of the annular body 2, annular protrusions 2e, 2f, 2g are formed. The protrusions 2e and 2f have the thinnest and elongated cross-sectional shape. The protrusion 2g projects to the outermost side. An annular groove 2i having a rectangular cross-section in the width direction is formed between the protrusions 2e and 2f.

The annular body 2 is made of vulcanized rubber. This vulcanized rubber must be tough enough to withstand the compressive stress of uneven settlement. Further, since it is used in soil that is not exposed to sunlight, natural rubber having high strength is preferable, but it is preferable to use natural rubber having bacteria resistance.

An annular water expansion material 3A made of water expansion rubber is fixed in the groove 2h on the inner peripheral surface of the annular body 2. An annular water expansion material 3B made of water expansion rubber is fixed to the groove 2i on the outer peripheral surface. The cross-sectional shape of the water expansion materials 3A and 3B in the width direction is substantially rectangular, and the water expansion material 3B is thicker than the water expansion material 3A. This water-expandable rubber is a mixture of a vulcanized rubber and powder of a water-swellable resin. The type of the water-expanded rubber is not limited, but a vulcanized rubber having a water absorption volume expansion factor of 50 to 250% is preferable.

FIG. 3 is a cross-sectional view of essential parts showing a state in which the water blocking material 1 has been applied. A substantially circular through hole 6 is formed in the manhole wall body 4. The water blocking material 1 is fitted on the outer peripheral surface of the sewer pipe 5, and then the sewer pipe 5 is inserted into the through hole 6. Including the projections 2e, 2f, 2a, 2b, the thickness of the annular body 2 is slightly thicker than the gap between the sewer pipe 5 and the manhole wall 4. Then, when the sewer pipe 5 is inserted into the through hole 6, the projections 2e and 2f are deformed flat. Thereby, the main body 2 made of vulcanized rubber is compressed in its thickness direction. Due to the compression restoring force of the vulcanized rubber, the annular body 2 is pressed against the sewer pipe 5 and the manhole wall 4, and the surface pressure prevents water flow.

According to this embodiment, the waterproofing material 1 can be installed by installing it on the outer peripheral surface of the sewer pipe 5 and inserting the sewer pipe 5 into the through hole 6. Therefore, sewer construction is much easier than before and does not require highly skilled workers. Moreover, since no filler such as mortar is used, the sewer construction site can be immediately backfilled.

Further, since the annular main body 2 is a molded product of vulcanized rubber which is an elastic body and has a function of relieving stress concentration in the sewer pipe joint portion due to uneven settlement, the sewer pipe is damaged. Can be prevented. If the cross-sectional shape of the annular main body 2 is made substantially rectangular and the thickness of the main body 2 is made larger than the gap between the sewer pipe 5 and the manhole wall 4, the sewer pipe 5 is inserted into the through hole 6. At this time, the annular body 2 is caught by the wall body 4, which makes the construction difficult. In this respect, since the projections 2e, 2f, 2a, 2b, 2c are provided so that these projections are compressed and deformed when the sewer pipe 5 is inserted, a great deal of force and skill are not required for this construction, and the construction work is difficult. It's easy. Along with this, water is stopped by utilizing the compressive restoring force of each of these protrusions.

[0013] Apart from such a problem at the time of construction, a problem may occur with respect to the waterproof performance after the construction. In other words, after backfilling, unbalanced pressure such as earth pressure may be applied and the sewer pipe may be displaced by subsidence. Then, as shown in FIG. 4, the gap above the sewer pipe 5 expands, and the surface pressure due to the compressive deformation of the projections 2e, 2f and the like decreases. Then, when the water pressure becomes larger, water enters as shown by arrow A, for example. In this case, the water expansion material 3B absorbs water, expands, and strongly presses the manhole wall body 4. As a result, the ingress of water stops. When water enters between the annular body 2 and the sewer pipe 5, the water expansion material 3A absorbs water and expands.

The water blocking effect of the water blocking material of this example was confirmed. In the sewerage pipes, in principle, there is a natural flow, and there is usually a gradient of 0.1% to 10%. The manhole is mounted vertically. Therefore, the wall of the manhole and the sewer pipe have a maximum inclination of about 6 °. In this case, even if the unbalanced settlement or the like is not applied, the water blocking material 1 is biased by the inclination. Then, actually, as shown in FIG. 4, the water blocking material 1 was attached, and the sewer pipe 5 was tilted at 7 ° to perform a water pressure test. Leakage occurred immediately after the pipe 5 was tilted, but stopped after 3 days. This is because the secondary water blocking effect was exhibited by the water expansion of the water expansion material.

[0015]

[Effect of the device]

 As described above, according to the present invention, sewer construction is much easier than before, and the sewer construction site can be immediately backfilled. In addition, since the annular body made of vulcanized rubber is used, stress concentration is relieved and damage to the sewer pipe can be prevented. Moreover, by providing the projections on the inner peripheral surface and the outer peripheral surface of the annular main body, it is possible to perform the construction without requiring a great deal of labor during the construction. In addition, even if the sewer pipe and the manhole wall are subsided unevenly, the water expansion material absorbs water and expands, thereby exerting a secondary water blocking effect. Therefore, the waterproof performance can be maintained for a very long time even after the construction.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a water blocking material 1 according to an embodiment of the present invention, taken in the width direction thereof.

FIG. 2 is a front view of the water blocking member 1 (viewed from the right in FIG. 1).

FIG. 3 is a cross-sectional view of essential parts showing a state in which the water blocking material 1 is installed between the sewer pipe 5 and the manhole wall body 4.

FIG. 4 is a cross-sectional view when the sewer pipe 5 and the manhole wall body 4 are unevenly submerged after the water blocking material 1 is applied.

[Explanation of symbols]

 1 Water stop material 2 Annular body 2a, 2b, 2c, 2d, 2e, 2f, 2g Annular protrusion 2h, 2i Annular groove 3A, 3B Annular water expansion material 4 Manhole wall 5 Sewer pipe 6 Wall through hole

Claims (1)

[Scope of utility model registration request] 1. A water blocking material to be installed between an outer peripheral surface of a sewer pipe and a wall surface through hole of a concrete manhole, wherein an inner peripheral surface and an outer peripheral surface have annular projections and grooves, respectively. An annular body made of vulcanized rubber provided, an annular water expansion member made of water expansion rubber fixed to the groove on the inner peripheral surface of the annular body, and fixed to the groove on the outer peripheral surface of the annular body. Water-stopping material having an annular water-expanding material made of water-expanding rubber.