JPH0245078B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) This invention relates to a waterproof belt for the purpose of forming a dense waterproof layer by absorbing water, and a joint or leakage part of a buried pipe using the waterproof belt. This relates to a construction method for the purpose of waterproofing.

(Prior art) Conventionally, to prevent water leakage at the joints of underground pipes for passing water or sewage, joint materials using hydraulic cement (Japanese Patent Application Laid-Open No. 57-144394) and non-shrinkable joint materials have been used. Various methods have been used, such as using mortar, resin mortar, rubber packing, or amorphous sealing materials.

(Problem to be solved by the invention) However, the work place for water leakage prevention is a wet area or has a poor underground work environment, and the conventional technology that requires curing takes a long time to harden. Moreover, reliable construction is extremely difficult. Furthermore, it is extremely difficult to maintain a water stop for a long period of time due to ground subsidence after construction, pressure from running vehicles, vibrations, etc.
It was seen as a force majeure to some extent. Due to the above situation, a large amount of rainwater or groundwater flows into the pipe, or sewage leaks from the pipe.
Therefore, in the case of inflow, the flow rate greatly exceeds the design value, causing a great deal of unreasonableness in relation to the processing capacity.
In the event of a spill, not only would this cause problems in terms of hygiene and environmental pollution, but there was also the risk of causing direct harm or disaster, such as road sinking due to the flow of earth and sand beneath the road surface.

(Means for Solving the Problems) However, the water-stopping waterproof belt of the present invention weakly fixes two laminated water-permeable thin-layer flexible materials at a predetermined interval to form parallel tubular portions. It is characterized in that the tubular part is interposed with a dried material containing a superabsorbent gelled material and formed into a band shape.

Here, the water-permeable thin-layer flexible material can be a woven fabric or a non-woven fabric made of synthetic fibers or natural fibers alone or in combination, or a synthetic resin sheet having a large number of small holes can also be used. . Further, it is possible to weakly fix the water-permeable thin-layer flexible material at predetermined intervals, using water-resistant sewing thread, water-soluble adhesive, or relatively weak heat welding.

Next, as the superabsorbent gelatinized material, an organic polymer, an inorganic superabsorbent powder, or a mixture thereof can be used. Examples of the organic polymer include polyacrylates, polyvinyl alcohol superabsorbent gel polymers, and acrylonitrile hydrophilic crosslinked polymers.

In addition, examples of inorganic highly absorbent powders include:
Examples include bentonite and other viscous dry powders or granules.

Next, the waterproof construction method of the present invention using the waterproof belt weakly fixes two layers of water-permeable thin-layer flexible material at a predetermined interval to form parallel tubular parts,
A waterproof belt formed in the form of a belt by inserting a dried product of super absorbent gel into the tubular part is wrapped around the joint or leakage point of the underground pipe, and water permeates into the waterproof belt by contact with it. It is characterized in that a waterproof layer is formed around the joint or water leakage point by swelling and gelling the superabsorbent gelled material interposed therein.

Here, the method of wrapping the waterproof belt is to wrap it wider than the joint width of the buried pipe to improve water-stopping properties.
It is also desirable to have sufficient overlap at the ends.

(Function) That is, according to the water-stop waterproof belt of the above invention,
A superabsorbent gel is held in a water-permeable thin layer of flexible material. If this household is placed in a wetland or the like, leakage water will pass through the water-permeable thin-layer flexible material and be absorbed by the highly water-absorbent gelled material. This gelation is subsequently retained by a thin layer of water permeable flexible material, forming an effective waterproof layer.

Further, according to the method for waterproofing underground pipes of the present invention, a waterproof belt having a simple structure can be easily wrapped around joints or leakage points of underground pipes.

If water leaks from the above-mentioned points of the buried pipe, the leakage will pass through the water-permeable thin layer flexible material of the waterproof belt,
Water is absorbed by the super absorbent gel. The superabsorbent gel material swells and gels, forming a reliable waterproof layer with the water-permeable thin layer flexible material.

(Example) Next, the present invention will be described with reference to an example. Two belt-shaped nonwoven fabrics 1 and 1a made of synthetic resin fibers are overlapped and spaced at a predetermined interval (for example, 10 mm to 25 mm) in the longitudinal direction.
The parallel tubular portions 2, 2 are formed by sewing them together at intervals (intervals). The waterproof belt 5 of the present invention is completed by uniformly filling each of the tubular parts 2, 2 with dried bentonite powder 3, and sewing both end edges 4, 4a to close the opening. In the figure, 6 and 6a are fastening strings attached to the edge of the waterproof belt. In the above embodiments, a non-woven fabric made of synthetic resin fibers was used as the water-permeable thin layer flexible material, but it is of course possible to use a woven fabric made from natural fibers or a mixture of synthetic resin fibers and natural fibers, or paper such as Japanese paper. , a synthetic resin sheet having a large number of small holes can also be used. However, it is preferable that the sewn portion (or thermal welding or adhesive bonding) between the two materials be made relatively easy to separate, so that a continuous waterproof layer is formed when the superabsorbent gel absorbs water and swells. For example, a waterproof band of higher quality can be obtained by using a water-resistant sewing thread, adhering with a water-soluble adhesive, or using relatively weak heat welding.

Although dry bentonite powder was used in the above embodiments, any harmless material that absorbs water and swells to form a waterproof layer can be used. Therefore, in addition to the above-mentioned bentonite powder, various clay powders, organic substances such as polyacrylates, polyvinyl alcohol-based superabsorbent gel polymers, and acrylonitrile-based hydrophilic crosslinked polymers may be used singly or in mixtures, or the above-mentioned Mixed use of inorganic and organic substances is also possible. The inorganic substance has a relatively high specific gravity, and the organic substance has a relatively low specific gravity, so by mixing them, the weight of the waterproof belt can be adjusted, and the swelling ratio of the inorganic substance is about 3 to 5 times, Since organic materials have a relatively large swelling ratio (for example, 10 to 50 times), the thickness of the waterproof layer can be controlled by using a mixture of organic and inorganic materials.

Next, a water stop construction method using the waterproof belt 5 of the present invention will be explained. The pipe bodies 7 and 7a are fitted in sequence,
Immediately before fixing each tube, one end of the waterproof band 5 is inserted under the tube joint 8, and after the tube is placed in a fixed position, the waterproof band 5 is wrapped around the outside of the tube, and the string is tied. 6, 6a to conclude. In this case, it is preferable that the outer wall of the tube body and the inner surface of the waterproof band 5 be bonded together as much as possible.

It is also important that the waterproof belt 5 is wrapped around both sides of the outer edge 8a of the tube joint 8 over a predetermined width (for example, 10 cm or more). The above width is sufficient as long as the waterproof layer does not come off due to movement of the pipe body due to external pressure or other reasons, but from experience, it has been found that the width of the pipe body joint due to normal degree of ground subsidence, vibration, pressurization of vehicles, etc. If the width is taken into consideration, a width of 10 cm or more is required, but if the width becomes significantly wider, not only will material costs rise, but workability will also deteriorate, so in practice
cm to 40cm are possible. Of course, the width also varies depending on the diameter of the tube. After treating the joint of the tube as described above, earth and sand 9 is poured in to embed the tube. After this, when water is absorbed by the highly absorbent gelled material (for example, bentonite powder) of the waterproof band 5, the gelled material swells and forms a waterproof layer 10 of a predetermined thickness as shown in FIG. , coupled with earth pressure, it adheres closely to the outer wall of the pipe. In this case, the outer shape of the waterproof layer is restricted by nonwoven fabric, etc., and the volume increases (for example, 3 times or more) due to swelling due to water absorption of the gelled material, and the waterproof layer applies expansion pressure to the pipe side and the earth and sand side. This makes it possible to further strengthen the adhesion with the outer wall of the tube. According to the above construction method, all you have to do is wrap the waterproof belt around a predetermined position.
Since a tight waterproof layer can then be automatically formed, the waterproofing purpose can be achieved relatively easily and with less labor, regardless of the skill of the construction technique.

Furthermore, even if the woven fabric or nonwoven fabric deteriorates due to bacteria, aging, or otherwise loses its binding force, the waterproof layer remains in place for a long time, so that the waterproofing purpose can be achieved.

In the above embodiments of the waterproof belt, the ends of the waterproof belt are fastened with a string, but since the string has a means to keep it attached, it can be left wrapped in the rolled-up state, or with a hook (for example, a hook with a metal strip). Similar effects can be expected by using .

(Effects of the Invention) That is, according to the present invention, since the highly water-absorbent gelled material is interposed between two thin, water-permeable and flexible band-like materials, it is easy to handle and can be arbitrarily and easily attached to the pipe body. It has the effect of being able to be attached to the body. In addition, since the parallel tubular parts are formed by fixing the strip materials and interposing the highly absorbent gelled material, even when the gelled material absorbs water leakage and expands, the fixation is released and the volume increase of the gelled material is absorbed. However, it has the effect of maintaining the attached state with the tube body.

Further, according to the construction method of the present invention, since it is only necessary to wrap a waterproof belt, the construction is simple and easy, and there is an effect that a waterproof layer of a predetermined thickness can be reliably formed without requiring special techniques. In addition, since the waterproof layer is formed by water absorption and swelling, the waterproof layer is pressed against the pipe wall during formation, resulting in good adhesion, and the waterproof layer is flexible, causing some deformation at the pipe joint. Or, even if displacement occurs due to vibration, there is no risk of destroying the waterproof layer, and the waterproofing purpose can be achieved for a long time.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of the invention, FIG. 2 is a partially enlarged perspective view, FIG. 3 is a partially perspective view during construction, and FIG. 4 is an enlarged sectional view.
Figure 5 is also a partially longitudinal front view when the waterproof layer is completed.
FIG. 6 is a longitudinal side view as well. 1, 1a... band-shaped nonwoven fabric, 2, 2... tubular part,
3... Bentonite powder, 5... Waterproof belt, 7,7
a... Tube body, 8... Tube body joint.

Claims (1)

[Scope of Claims] 1. Two layers of water-permeable thin-layer flexible material are weakly fixed at a predetermined interval to form parallel tubular sections, and a dried superabsorbent gel material is applied to the tubular sections. A water-stopping waterproof band formed into a band-like shape. 2. The water-stopping waterproof belt according to claim 1, wherein the water-permeable thin layer flexible material is a woven fabric or a non-woven fabric made of synthetic fibers or natural fibers alone or in combination. 3. The water-stopping waterproof belt according to claim 1, wherein the water-permeable thin-layer flexible material is a synthetic resin sheet having a large number of small holes. 4. The water-stop waterproof belt according to claim 1, wherein the super-absorbent gel material is an organic polymer or/and an inorganic super-absorbent powder. 5. The water-stopping waterproof belt according to claim 4, wherein the organic polymer is a polyacrylic acid salt, a polyvinyl alcohol-based superabsorbent gel polymer, or an acrylonitrile-based hydrophilic crosslinked polymer. 6. The waterproof band for water-stopping according to claim 4, wherein the inorganic highly water-absorbing powder or granule is bentonite or other clay dry powder or granule. 7. Two layers of water-permeable thin-layer flexible material are weakly fixed at a predetermined interval to form parallel tubular portions, and a dry superabsorbent gel material is interposed in the tubular portion,
A waterproof belt formed in a belt shape is wrapped around a joint or a water leakage point of an underground pipe, and water permeates into contact with the waterproof belt to swell and gel the superabsorbent gelled material interposed in the waterproof belt, thereby preventing the joint or water leakage. A method for waterproofing underground pipes, which is characterized by forming a waterproof layer around the area. 8. The method for waterproofing a buried pipe according to claim 7, wherein the waterproof band is wound wider than the joint width of the buried pipe and has sufficient overlap at the ends.