JPH09109299A - Water barrier composite sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water barrier composite sheet which makes it possible to block the sewing holes by self-repairing function utilizing moisture in the atmosphere to be absorbed through the holes after connecting by sewing and to eliminate the waterproofing treatment of the holes by making it possible to preserve for a long period before the execution and performing the self- repairing function to the maximum limit after the execution. SOLUTION: The nonwoven fabric of the small chambers 11b of a support sheet 13 obtained by integrating the nonwoven fabric with rubber net-like sheet having many small chambers 11b is impregnated with liquid-like polymerizable compound for forming a water resistant structure obtained by reacting with water to be cured to form a reaction layer 14. A sheet-like water absorption swell layer 15 made of a mixture of rubber, water absorption material and polymerization catalyst and a rubber water barrier sheet 16 are sequentially superposed on each of both side surfaces of the layer 14 and integrated to form a water barrier composite sheet 10.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a waste disposal site,
TECHNICAL FIELD The present invention relates to a composite sheet for water blocking, which is suitable for use in excavation work for a reservoir, mine, tunnel, caisson and various reinforced concrete buildings.

[0002]

2. Description of the Related Art As a water-impervious composite sheet used for waterproofing the above-mentioned waste disposal site, etc., Japanese Patent Laid-Open No. 2-176012
The gazette discloses a water-impervious structure in which a water-impervious layer having water impermeability and a repair layer made of a material that expands when contacted with water to cause water impermeability are laminated. However, since this water-impervious structure has a repair layer that reacts with water placed continuously between the water-impervious layers, there is no problem in the construction of the horizontal part, but if the construction part is inclined, There is a problem that the water-blocking compound that forms the layer hangs down to the bottom and that the entire water-blocking structure is solidified by a single leak and cannot respond when the next leak occurs, and the so-called self-repair function is lost. there were.

In Japanese Patent Laid-Open No. 6-286062, a water-impermeable sheet made of rubber or resin is laminated in a sandwich shape on both upper and lower sides of an intermediate sheet made of rubber having water swelling property and water-crosslinking property, and Reinforced with a fiber sheet, after construction, when holes are opened by nails, glass, rock corners, etc. and water leakage starts, the above intermediate sheet absorbs water, swells and closes the holes, and at the same time bridges progress and short It is disclosed that the water leakage is stopped in a time, and even after the water leakage is stopped, the water stopping effect is maintained without being dissolved in water.

However, in this case, a water-absorbing material and a silane coupling agent which imparts water-crosslinking property are added to the rubber, and the mixture is molded into a sheet to form an intermediate sheet. Since it was covered with a sheet, if the storage period before construction becomes long, moisture in the atmosphere will be absorbed from a few defects and crosslinking will occur in part or the whole of the intermediate sheet, so the self-repair function after construction will be halved. In addition, when sewing with a sewing machine to join the water-impervious composite sheet during construction, the water entering from the sewing machine hole causes cross-linking in a wide area of the intermediate sheet and loses the self-repair function. I had to close it.

[0005]

SUMMARY OF THE INVENTION When the sewing machine sewes a sewing machine hole or when a nail or a rock is pierced after construction, the present invention automatically reacts with the above-mentioned sewing machine hole and the like. It has a self-repairing function that blocks water, its water-stopping effect is permanent, there is no need to waterproof the sewing machine holes, and there is no uneven distribution of reactive compounds that react with water on one side, and there is a hole opening. Only in the vicinity of the above, the self-repairing function is exhibited, and in the part away from the perforated part, the self-repairing function is preserved without loss, long-term storage before construction is possible, and the self-repairing function is maximized after construction. The present invention provides a composite sheet for water blocking.

[0006]

The water-impermeable composite sheet of the present invention is a powdery or liquid reactive compound which reacts with water and cures to form a water resistant structure, and which shields this reactive compound from the atmosphere. Upper and lower two water-impervious sheets made of a polymeric material to be protected against heat and a large number of small chambers for separating the above-mentioned reactive compound by a predetermined amount and maintaining a uniform distribution density between the two water-impervious sheets. It is characterized in that it comprises a support sheet made of a water-resistant polymer material for forming the above, and the above-mentioned reactive compound is housed in this small chamber to form a reaction layer between the upper and lower two water-blocking sheets. As the reactive compound,
Inorganic compounds such as cement and water glass that harden by reacting with water, and organic compounds (polymerizable compounds) such as liquid monomers, oligomers, and polymers that can be polymerized by reacting with water in the presence or absence of a catalyst It is illustrated.

The water-impermeable composite sheet of the present invention is provided with a large number of small chambers for separating the reactive compound by a predetermined amount and maintaining a uniform distribution density in the water-impermeable sheet. Reactive compounds do not react with moisture in the atmosphere during storage. Then, when two sheets of the water-permeable composite sheet are joined by sewing with a sewing machine and a sewing machine hole is formed in the joint portion during the construction, moisture in the atmosphere comes into contact with the reactive compound through the sewing machine hole. The compound forms a water-resistant structure to close the sewing machine hole, and the reactive compound in the small chamber other than the small chamber in which the sewing machine hole is formed does not absorb water, and its self-repairing function is preserved. Also, if a hole is opened with a nail or other material after construction and water leakage starts, only the reactive compound in the small chamber with the hole reacts with water, and the reactive compound in the other small chamber does not react with water, Its self-healing function is preserved.

As the reactive compound of the present invention, there are inorganic compounds and organic compounds as described above, but as the polymerizable compound which reacts with water in the presence of the polymerization catalyst to form a water resistant structure, the molecular chain is Liquid polymers or oligomers having a hydroxyl group, a silyl group or a mercaptan group at the end, such as isoprene, butadiene, styrene-butadiene, acrylonitrile butadiene rubber, oxypropylene, silicon (oxytetramethylene) glycol, olefin glycol and ε-caprolactone. Preference is given to using liquid monomers, oligomers and polymers, especially liquid oligomers and polymers. As the polymerization catalyst, amines, isocyanates and tin compounds are exemplified, and an appropriate one is selected according to the polymerizable compound used.

The water-blocking sheet for protecting the reactive compound such as the above-mentioned polymerizable compound by blocking it from the atmosphere has water resistance and blocks the above-mentioned reactive compound from moisture in the atmosphere, Is to prevent contact with moisture in the atmosphere, and a sheet made of rubber or synthetic resin is preferable. As rubber, natural rubber and IR, SBR, BR, EP
M, EPDM, IIR, brominated IIR, chlorinated IIR,
Chlorinated polyethylene rubber, CSM, CR, NBR, FP
Synthetic rubbers such as M and Q are exemplified, and PV is used as the synthetic resin.
C, high density polyethylene, crosslinked polyethylene, chlorinated polyethylene and the like are exemplified.

As a supporting sheet for forming a small chamber between the upper and lower two water-blocking sheets, a bag of about the same size as the water-blocking sheet is made of a water-resistant thermoplastic synthetic resin film, and a reactive compound is enclosed therein. After that, the films on the front and back are fused to form many small chambers. This support sheet can be used as a reaction layer by interposing one layer or two or more layers between the upper and lower water shield sheets. Further, the support sheet may be a water-resistant mesh sheet that divides the upper and lower water-blocking sheets vertically and horizontally to form a large number of small chambers of any shape such as a circle, a square, a rhombus, and a hexagon. The above-mentioned small chamber surrounded by a partition wall is filled with a predetermined amount of the reactive compound. The area of the small chamber is 1 to 1
00 cm ² is preferred.

The reticulated sheet can be formed in a lattice shape by punching a large number of holes of arbitrary shape in a wide sheet similar to the water impervious sheet. In addition, a large number of short cuts can be made in a narrow width sheet in a zigzag pattern in parallel with the length direction, and the sheets can be made to have the same width as the impermeable sheet. Then, each of the above small chambers can be filled with a fibrous sheet, for example, a small piece of non-woven fabric. Also, by supporting a fiber sheet such as a non-woven fabric, a woven fabric or a knitted fabric with a polymeric material such as rubber or a synthetic resin in the shape of the partition wall and curing the composite sheet, the mesh sheet and the fiber sheet are supported in a composite and integrated form. As a sheet, a water-resistant partition wall can be formed in the structure of the fiber sheet, in which case the fiber sheet in the small chamber can be impregnated with the reactive compound to further reduce the uneven distribution of the compound and to prevent water impermeable. The composite sheet can be reinforced.

The above-mentioned fiber sheet is an inorganic fiber such as glass fiber, carbon fiber or metal fiber, organic fiber (including crimped fiber or elastic fiber) such as natural fiber or artificial fiber, and fiber such as fibrillated film. Woven material made of sheet material,
A knitted fabric, a non-woven fabric, a weave, and the like are exemplified. In particular, a nonwoven fabric having wide inter-fiber voids is particularly preferable because it is easy to impregnate a reactive compound. The fibers constituting the non-woven fabric are hydrophilic fibers such as cotton, rayon and nylon, and polyester,
Any hydrophobic fiber such as polypropylene may be used, or a mixture thereof may be used. When hydrophilic fiber or water-absorbent fiber is used, the time required to complete the water stop can be shortened. Elastic fibers are also advantageous in reducing the holes created by damage.

A water absorption swelling layer made of a polymer material containing a water absorbing material is interposed between the reaction layer containing the above reactive compound and the upper and lower water blocking sheets to shorten the time required to complete the water stopping. You can Examples of the water-absorbing material include pulp, bentonite, starches, natural materials such as celluloses having excellent water-absorbing property, polyacrylic acid-based materials, starch / acrylic acid, vinyl acetate / acrylic acid copolymers, polyethylene oxide-based materials. , Isobutylene / maleic anhydride copolymers, PVA / maleic anhydride copolymers, acrylate / acrylamide copolymers, CMC-based superabsorbent polymers are exemplified, and these are used alone or in combination of two or more. Are used in combination. As the polymer material, the same rubber or synthetic resin as the water-blocking sheet can be used. In addition, the above water-absorbing material can be added to the reaction layer to impart water absorbency to shorten the time required for stopping water.

When the above reaction layer is formed by a liquid polymerizable compound which reacts with water in the presence of the above polymerization catalyst and solidifies to form a water resistant structure, the polymerization catalyst absorbs water and swells differently from the reaction layer. It is necessary to add it separately to the layer so that the polymerizable compound and the polymerization catalyst do not come into direct contact with each other. The water content does not cause the polymerizable compound to start the polymerization reaction.

Further, the above-mentioned polymerization catalyst can be used in a form coated with a water-soluble shielding material in order to separate it from the polymerizable compound. For example, the polymerization catalyst can be encapsulated with the above shielding material. In addition, a core-sheath fiber in which a polymerization catalyst is wrapped in a sheath made of the above-mentioned shielding material is spun, and may be used as it is or cut into short pieces, and the above-mentioned polymerization catalyst is kneaded into the above-mentioned shielding material. It may be crushed, crushed, and granulated. Further, the layers made of the shielding material may be laminated on and under the layer made of the polymerization catalyst to form a film, which may be cut. In these cases, the polymerization catalyst can be added to any layer of the reaction layer, the water absorption swelling layer and the water-blocking sheet, and furthermore, the polymerizable compound and the polymerization catalyst can be prevented from coming into direct contact with each other.

On the other hand, methylenebisphenylisocyanate (M) is used as a liquid polymerizable compound which does not require a polymerization catalyst and reacts directly with water to cure to form a water resistant structure.
DI), 2,4-toluene diisocyanate (TD
I), 2,6-toluene diisocyanate (TDI),
Paraphenylene diisocyanate (PDI), 1,5-
Isocyanate compounds such as naphthalene diisocyanate (NDI) and hexamethylene diisocynate (HDI) and other liquid monomers, oligomers and polymers are mentioned, and MDI and TDI are particularly preferable.

A liquid polymerizable compound which does not require the above-mentioned polymerization catalyst and reacts directly with water to form a water resistant structure by curing reacts with water in the presence of the above-mentioned polymerization catalyst,
Similar to the liquid polymerizable compound that cures to form a water resistant structure, the reaction layer can be formed by accommodating it in a small chamber of a support sheet interposed between two upper and lower water shield sheets. As the supporting sheet, a bag is made of a thermoplastic synthetic resin film having water resistance, a polymerizable compound is encapsulated, and then fused to form a number of small chambers. A water-resistant mesh sheet for partitioning into a number of small chambers, and a supporting sheet such as a composite sheet in which the small chamber of the mesh sheet is filled with fibers by impregnating a fiber sheet with a portion corresponding to the partition wall of the mesh sheet. Can be used as above. In addition, a water absorbing and swelling layer can be interposed between this reaction layer and the upper and lower water blocking sheets, and a water absorbing material can be added to the reaction layer. Further, a water-absorbent fiber may be used as the fiber constituting a part of the support sheet as described above.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. 1 shows an example of a mesh sheet 11 forming a small chamber,
A large number of square holes are punched out from an unvulcanized rubber sheet to form a lattice, and the crosspiece 11a forms a water resistant partition wall, and the square holes 11b form small chambers. As shown in FIG. 2, the non-woven fabric 12 is superposed on the upper and lower surfaces of the mesh sheet 11 and vulcanized under pressure. As shown in FIG.
1 and the upper and lower non-woven fabrics 12 are integrated to form a supporting sheet 13, and the non-woven fabrics 12 in the small chambers 11b react with water in the presence of a catalyst to cure and harden to form a water resistant structure. The reaction layer 14 of the water-permeable composite sheet 10 shown in FIG. 4 is formed by impregnating a liquid polymer having a silyl group at the end. The nonwoven fabric 12 can be made of water-absorbent fibers.

On the other hand, a water absorbing material and a polymerization catalyst are mixed with rubber and molded into a sheet to form the water absorbing and swelling layer 15. The water-swelling and swelling layer 15 is superposed on the upper and lower surfaces of the reaction layer 14, and the water-impervious sheets 16 made of rubber are further laminated on the upper and lower surfaces thereof, and heated under pressure to form the water-impervious sheet 16 and the water-absorption swelling layer 15. Vulcanization is performed to obtain a water-permeable composite sheet 10 having a five-layer structure. In addition, the obtained composite sheet 10 for waterproofing
Waterproof paint can be applied to the four circumferences.

The above-mentioned composite sheet 10 for waterproofing is covered with rubber waterproofing sheets 16 on both upper and lower sides thereof,
It can be laid for water shielding at a waste disposal site or the like, and at that time, it can be used in a desired area by adding adhesives or stitches in the length direction and the width direction according to the size of the construction site. At the time of the laying, the composite sheet 10 has the reaction layer 14
Since the water impervious sheet 16 is reinforced with the inner fiber sheet (nonwoven fabric) and the water-impervious sheet 16 is made of rubber, it easily fits the unevenness of the laying surface and breaks when it comes into contact with sharp-edged objects such as rocks or crushed stone Difficulty and further, the expansion of the damaged part is prevented. Then, the nonwoven fabric 12 of the reaction layer 14 is impregnated with the liquid polymer, and the water absorbing and swelling layers 15 on the upper and lower surfaces thereof are blended with the water absorbing material and the polymerization catalyst to separate the liquid polymer and the polymerization catalyst. Is a waterproof waterproof sheet 1
Since it is coated with No. 6, the liquid polymer does not react with moisture in the air and harden.

After the construction, when the above-mentioned water-proof composite sheet 10 is damaged by nails or the like and water leakage starts, the two water-absorption swelling layers 15 absorb the water and swell, and the swelling damages the damaged portion. Is closed. That is, water leakage is stopped by the self-repairing force of the composite sheet 10 itself. And
Since the polymerization catalyst in the water-swelling and swelling layer 15 promotes the polymerization reaction of the liquid polymer in the reaction layer 14 with the start of the water leakage, the liquid polymer is cured while the holes are closed and the water stopping is completed in a short time. The water stop effect continues.

Further, since the reaction layer 14 is divided into a large number of small chambers 11b by the partition wall 11a made of water resistant rubber, when a hole penetrating any small chamber 11b is opened, the liquid inside the small chamber 11b is opened. Only the polymer reacts with water and hardens while closing the holes in the same manner as described above, and this hardening reaction does not spread to the adjacent small chamber 11b. Therefore, the small chamber 1
When a hole is formed in the adjacent small chamber 11b after the completion of the water stop of 1b, the liquid polymer in the latter small chamber 11b reacts and hardens to stop the water leakage.

Embodiment 2 The non-woven fabric (fiber sheet) 12 of Embodiment 1 is made of water-absorbent fibers, and the rubber mesh sheet 11 is used as in Embodiment 1.
The nonwoven fabric 12 in the small chamber 11b
Is impregnated with an isocyanate compound (a liquid polymerizable compound that directly reacts with water in the absence of a catalyst) to form a reaction layer 14A.
(See FIG. 5). On the other hand, by mixing only the water-absorbing material with rubber and omitting the mixing of the polymerization catalyst to form a sheet-like water-swelling layer 15A, this water-swelling layer 15A is overlaid on the water-impervious sheet 16 made of rubber, and under pressure. Heat and vulcanize and bond,
The surface of the water absorption swelling layer 15 of the obtained laminate is attached to the above reaction layer 14
The water-impermeable composite sheet 20 of the second embodiment is manufactured by adhering the upper and lower surfaces of the sheet with an adhesive. In addition, this water-permeable composite sheet 2
Waterproof paint can be applied to the four circles.

The composite sheet 20 for water impervious of the second embodiment
Can be used in the same manner as in Embodiment 1, but since the non-woven fabric 12 of the reaction layer 14A is made of water-absorbent fibers, water stopping is completed in a shorter time, and no catalyst is required in the reaction layer 14A. Since such an isocyanate compound is used and a catalyst is not used, it can be manufactured at a lower cost than in the first embodiment.

[0025]

【Example】

Example 1 A composite sheet 10 for waterproofing of Embodiment 1 shown in FIG. 4 was manufactured. First, a rubber sheet having a thickness of 1 mm is molded from unvulcanized NBR, and as shown in FIG. 1, small compartments 11b of squares having a side length a of 50 mm are provided at equal intervals in length and width, and a partition wall 11a having a width b of 5 mm. Was formed. As shown in FIG. 2, a needling non-woven fabric (weight per unit area: 150 g / m ² ) 12 made of water-absorbent acrylic fiber (manufactured by Toyobo Co., Ltd., product name “Lanseal”) 12 is provided on both upper and lower surfaces of the obtained mesh sheet 11. Overlap
Vulcanize for 20 minutes at a pressure of 5 kg / cm ² and a temperature of 160 ° C.
The mesh sheet 11 made of rubber and the non-woven fabric 12 are integrated,
The support sheet 13 having the partition wall 11a is made, and the small chamber 1
The non-woven fabric 1b of 1b was impregnated with methyldimethoxysilyl group-terminated polypropylene oxide (“Kanecarol” manufactured by Kanegafuchi Chemical Industry Co., Ltd.) at a rate of 1500 g / m ² as a liquid polymerizable compound that reacts with water in the presence of a catalyst. The reaction layer 14 was used.

The water-swelling layer 15 was prepared by kneading the compounds shown in Table 1 below with a Banbury mixer and molding it with an extruder to a thickness of 0.5 mm. However, in Table 1, TT is tetrathiuram disulfide, PZ is zinc dimethyldithiocarbamate, and M is 2-mercaptobenzothiazole.

Table 1 EPDM (manufactured by Mitsui Oil Co., Ltd., product number “3045”) 100 parts by weight Zinc white 5 parts by weight Stearic acid 1 part by weight Coumaron resin 3 parts by weight SRF black 50 parts by weight Clay 15 parts by weight Process oil 20 parts by weight Sulfur 2 parts by weight Accelerator TT 1.5 parts by weight Accelerator PZ 1.5 parts by weight Accelerator M 1.0 parts by weight Super absorbent polymer (Kuraray Co., Ltd., trade name "KI gel 201K-F2") 100 parts by weight Amine-based polymerization catalyst (manufactured by NOF Corporation, trade name "Amine BB") 2 parts by weight Tin fatty acid salt-based polymerization catalyst (manufactured by Sakai Chemical Co., trade name "CN-12") 6 parts by weight

The water swelling layer 1 is formed on both upper and lower surfaces of the reaction layer 14.
5 was further laminated, and 0.5 mm thick water-impervious sheet 16 made of EPDM was further laminated on both upper and lower surfaces thereof, a surface pressure of 10 kg / m ² was applied, and vulcanization was performed at 180 ° C. for 15 minutes to prepare Example 1. A composite sheet 10 for water blocking was obtained.

A square having a side length of 400 mm was cut out from the water-permeable composite sheet 10 of Example 1 to obtain a test piece 25 (see FIG. 6).
Refer to), and a hole 2 with a diameter of 10 mm is formed in the center of the test piece 25
5a was opened, and a water stop test was conducted using the water stop test device 30 shown in FIG. In FIG. 6, 31 is a base plate (diameter 320 mm),
32 and 33 are tanks (height 330 mm), and the test piece 25 has a diameter of 10 mm between the lower tank 32 and the upper tank 33.
The center hole 25a of mm is located in the center and is sandwiched. Then, the water W is supplied to the upper tank 33 from the water supply hole 33a,
When the internal air is removed from the air hole 33b, the water W is filled with the bottom opening 33c of the upper tank 33, the center hole 25a of the test piece 25, the upper opening 32a of the lower tank 32, and the silica sand 34 filled in the lower tank 32. It flows out through the perforated plate 35, the bottom surface opening 32b, and the central hole 31a of the base plate 31.

In the water stop test device 30 shown in FIG.
When the water pressure was set to 3 kg / cm ² , the water flowing downward from the central hole 31a of the base plate 31 stopped in 20 minutes. When the test piece 25 was left for 24 hours to cure the liquid polymer in the reaction layer 14 and then the test piece 25 was taken out and allowed to stand in a room at room temperature for 4 weeks, the hole 25a remained blocked. And again, the above-mentioned water stop test device 3
When it was attached to No. 0 and a water stop test was conducted at a water pressure of 3 kg / cm ² , there was no water leakage.

On the other hand, when a similar water stop test was conducted for the comparative example in which the liquid polymer, the polymerization catalyst, the reticulated sheet 11 and the non-woven fabric 12 of Example 1 were omitted, the time required for the first water stop was 30 minutes. was. But,
When left for 4 weeks in the same manner as above, the holes reopened, and when a water stop test was conducted, it took 30 minutes to stop the water in the same manner as above.

Example 2 A composite sheet 20 for waterproofing of Embodiment 2 shown in FIG. 5 was manufactured. First, in the same manner as in Embodiment 1, a support sheet 13 composed of a NBR mesh sheet 11 and a needling non-woven fabric 12 of water-absorbent acrylic fiber is made, and reacts with water in the non-woven fabric 12 of the small chamber 11b in the absence of a catalyst. MDI (“Sampren WE-106” manufactured by Sanyo Kasei Co., Ltd.) was impregnated as a liquid polymerizable reaction product at a rate of 1500 g / m ² to obtain a reaction layer 14A.

The water-swelling and swelling layer 15A was formed to a thickness of 0.5 mm with the same composition except that the amine-based polymerization catalyst and the tin fatty acid salt-based polymerization catalyst were omitted from the composition of Table 1.
Then, the water-impermeable and swelling layer 15A is overlaid with the water-impermeable sheet 16 made of EPDM of Example 1 and having a thickness of 0.5 mm.
A surface pressure of m ² is applied, and the mixture is vulcanized at 180 ° C. for 15 minutes to be integrated, and then a rubber-based adhesive (manufactured by Toyo Tire & Rubber Co., Ltd., respectively) is formed on the surface of the water-swelling layer 15A and the upper and lower surfaces of the reaction layer 14A. "Acmebond AD380") 20
The water-proof composite sheet 20 of Example 2 was manufactured by applying a coating weight of 0 g / m ² , stacking these, and heating them at 150 ° C. for 5 minutes while applying a surface pressure of 1 kgf / cm ² with a press.

When the water blocking composite sheet 20 of Example 2 was subjected to the same water stopping test as described above, the water pressure was 3 kgf.
The time required to stop the water was 20 minutes at / cm ² .
Then, the sample was left to stand in a room at room temperature for 4 weeks in the same manner as above, but the hole 25a remained blocked, and when the above water stop test was conducted again, there was no water leakage.

[0035]

According to the invention described in claims 1 to 8, when a hole is opened by a nail or the like after construction and water leakage starts, the reactive compound in the small chamber in which the hole is formed reacts with water to be hardened, resulting in a water resistant structure. It has a self-repairing function of forming a hole and closing the hole, and does not dissolve or decompose after the completion of the water stop, and the water stop effect continues. Moreover, since only the reactive compound in the small chamber with a hole reacts with water and the reactive compound in the other small chamber does not come into contact with water, water does not penetrate into the other small chamber and the self-repair function is not lost. . Moreover, the reactive compound does not lose its self-repair function due to contact with moisture in the atmosphere during storage before construction.

When the sewing machine is sewn together and a sewing hole is formed at the joint, water in the atmosphere comes into contact with the reactive compound through the sewing hole, and this reactive compound forms a water resistant structure. The self-repairing function is preserved because the perforation of the sewing machine is not closed and then reopened, and the reactive compound in the compartment other than the compartment where the perforation of the sewing machine does not absorb water. Since the above small chamber is formed by a supporting sheet made of a water-resistant polymer material between the upper and lower two water-blocking sheets, it is easy to manufacture and the water-blocking sheet itself supports the reactive compound. There is no such decrease in strength.

According to the second aspect of the invention, the supporting sheet is formed of a mesh sheet, so that the manufacturing is particularly easy. According to the invention of claim 3, the fiber sheet in the compartment of the mesh sheet is impregnated with the reactive compound, which makes it easier to hold the reactive compound and handle the reaction layer. According to the fourth aspect of the invention, since the water-absorption swelling layer is interposed between the water-blocking sheet and the reaction layer, the time required to stop water can be shortened. Further, in the invention according to the fifth aspect, since the water absorbing material is added to the reaction layer, the time required to stop water is similarly shortened.

According to the sixth aspect of the invention, the reactive compound reacts with water in the presence of the polymerization catalyst, and the polymerization catalyst is added to a layer other than the reaction layer. There is no direct contact, and therefore the polymerizable compound does not start the polymerization reaction with the moisture in the atmosphere until the holes are opened even during the storage of the water-impermeable composite sheet or after the construction. Further, in the invention according to claim 7, since the polymerization catalyst is added to any layer in a form coated with a water-soluble shielding material, until the hole is opened as in the invention according to claim 6,
The polymerizable compound does not start the polymerization reaction due to water in the atmosphere.

According to the eighth aspect of the present invention, since a liquid polymerizable compound that directly reacts with water is used as the reactive compound,
A polymerization catalyst is unnecessary and a reaction layer can be formed at low cost.

[Brief description of the drawings]

FIG. 1 is a plan view of a mesh sheet according to a first embodiment.

FIG. 2 is a cross-sectional view of a state in which a mesh sheet and a nonwoven fabric (support sheet) are stacked.

FIG. 3 is a cross-sectional view of a non-woven fabric (support sheet) combined with a mesh sheet.

FIG. 4 is a sectional view of the first embodiment.

FIG. 5 is a cross-sectional view of the second embodiment.

FIG. 6 is a sectional view of a water stop test device.

[Explanation of symbols]

10, 20: Composite sheet for water impermeable 11: Mesh sheet 11a: Crosspiece (partition wall) 11b: Hole (small chamber) 12: Nonwoven fabric 13: Support sheet composed of mesh sheet and nonwoven fabric 14, 14A: Reaction layer 15, 15A : Water absorption swelling layer 16: Impermeable sheet 25: Test piece 25a: Central hole of test piece 30: Water stop test device 31: Base plate 32, 33: Tank 34: Silica sand 35: Perforated plate

Front page continuation (72) Inventor Shino Ohnishi 1-2-6 Dojimahama, Kita-ku, Osaka-shi, Toyo Kasei Co., Ltd. (72) Kenichi Kawamoto 1-2-6 Dojimahama, Kita-ku, Osaka-shi, Osaka No. Toyo Kasei Kogyo Co., Ltd.

Claims (8)

[Claims] 1. A powdery or liquid reactive compound which reacts with water to cure to form a water resistant structure, and two upper and lower sheets made of a polymeric material which shields this reactive compound from moisture in the atmosphere to protect it. And a support made of a water-resistant polymeric material that forms a large number of small chambers for separating the above-mentioned reactive compound by a predetermined amount and maintaining a uniform distribution density between the two water-blocking sheets. A water-impervious composite sheet comprising a sheet, wherein the above-mentioned reactive compound is housed in this small chamber to form a reaction layer between two upper and lower water-impervious sheets. 2. The water-impermeable composite sheet according to claim 1, wherein the support sheet is a mesh sheet having a water-resistant partition wall that vertically and horizontally partitions the upper and lower water-impermeable sheets to form a large number of small chambers. Composite sheet for water. 3. The water-impermeable composite sheet according to claim 1, wherein the supporting sheet is formed by impregnating a fiber sheet with a polymeric material in the form of partition walls of a number of small chambers and curing the fiber sheet. 4. The composite sheet for water blocking according to claim 1, wherein a water absorption swelling layer made of a polymer material containing a water absorbing material is interposed between the water blocking sheet and the reaction layer. Composite sheet for water barrier. 5. The composite sheet for water shielding according to claim 1, wherein a water absorbing material is added to the reaction layer. 6. The water-permeable composite sheet according to claim 1, wherein the reactive compound is a liquid polymerizable compound that reacts with water in the presence of a polymerization catalyst to form a water resistant structure. A water-impervious composite sheet containing the above-mentioned polymerization catalyst in a layer other than the reaction layer. 7. The water-impermeable composite sheet according to claim 6, wherein the polymerization catalyst is added to any of the reaction layer, the water-swelling layer and the water-impermeable sheet in the form of being coated with a water-soluble shielding material. Composite sheet for water. 8. The water shield composite sheet according to claim 1, wherein the reactive compound is a liquid polymerizable compound that directly reacts with water and cures to form a water resistant structure. For composite sheet.