JP2008082155A - Joining method for water-proof sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water-proof sheet wherein the water-proof sheets made of vulcanized rubber can be joined to each other by heat fusion while having favorable workability in places like a corner and/or the periphery of a drain without causing such a problem as deterioration in an appearance or deterioration in water-proofing quality. <P>SOLUTION: This joining method for water-proof sheets for joining water-proof sheets 1 made of vulcanized rubber to each other is composed in such a way that a thermoplastic resin film 2 is laminated by heat adhesion only on a joint part of the water-proof sheet 1 which is also a joint surface to the other sheet. Then, the water-proof sheets are joined to each other by heat fusion. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is a method for joining a waterproof / waterproof sheet used to form a waterproof layer on a foundation made of concrete or the like, and in particular a mechanical layer that can form a waterproof layer without being affected by the existing foundation condition. The present invention relates to a method for joining sheets used in a fixing method.

  The method of forming the waterproof layer on the foundation made of concrete or the like of the waterproof sheet can be divided into two types, an adhesion method and a mechanical fixing method. The close contact method is also called a method of attaching a waterproof sheet to the entire surface of the base using an adhesive, and the waterproof sheet is not applied to the base by using anchor members such as bolts, screws or nails without using the adhesive. It is a method to fix to.

  Adhesion method has the problem that the adhesive does not work if the substrate contains moisture, and there is a problem of evaporation of moisture after laying. (Patent Document 1).

  Therefore, it can be laid regardless of the state of the base, and is fixed only locally. Therefore, even if the base contains moisture, there is an advantage that water vapor generated from the base can be easily exhausted.

  It is preferable that the waterproof sheets used in such a mechanical fixing method are joined to each other by heat fusion that exhibits strength immediately after joining. Therefore, using a material made of a synthetic resin such as vinyl chloride as the material of the waterproof sheet, when joining the waterproof sheets, heat fusion is performed by heating and melting the joints with hot air or electromagnetic induction heating, etc. We were joining by.

  However, synthetic resins such as vinyl chloride are inferior in weather resistance when used as a waterproof sheet, and when used over a long period of time, the waterproof sheet surface may crack and cause a problem of water leakage. In addition, since the material has a large thermal shrinkage and poor dimensional stability due to seasonal changes, there are problems in appearance such as generation of wrinkles and environmental problems because it contains chlorine.

  Vulcanized rubber is a material often used as a waterproof sheet in addition to a synthetic resin such as vinyl chloride. Vulcanized rubber sheets are less susceptible to cracking due to inferior weather resistance as described above compared to synthetic resin sheets, wrinkles due to heat shrinkage, and environmental problems. Since the sheet does not melt, the sheets cannot be fused together. Usually, an adhesive is used for joining, but there is a waiting time such as applying and pasting the adhesive and drying, so a certain time is required to obtain a predetermined joining strength by the adhesive force. There was a problem that a large bonding strength could not be obtained.

  Therefore, Patent Document 2 discloses that a waterproof sheet made of vulcanized rubber is fixed to a base by heat fusion. By using a sheet in which a thermoplastic resin film is laminated by heating in the vulcanization process of the vulcanized rubber sheet, it is melted by means such as electromagnetic induction heating with the thermoplastic resin coated on the surface of the fixed plate fixed to the base. Can be worn. Similarly, the waterproof sheets can be joined to each other by thermal fusion using means such as hot air.

JP-A-4-258451 JP 2003-35013 A

  However, the portion used for fixing the waterproof sheet to the base and the joint between the waterproof sheets are usually 10% or less of the entire waterproof sheet, and covering the entire surface of the waterproof sheet with the thermoplastic resin film as described above Most of the remaining portions that are not used for fixing or joining are lost.

  In addition, there is no problem with heat-sealing using a thermoplastic resin film for joints between general waterproof sheets, but there are corners such as corners of entry and exit, surrounding structures protruding from the base, and around drains. In the case of using a waterproof sheet, there is a problem that workability will be deteriorated or appearance and waterproof quality will be deteriorated if construction using an adhesive, which is a characteristic of waterproof sheets made of vulcanized rubber, is not performed. It was.

  Therefore, the present invention can waterproof the waterproof sheets made of vulcanized rubber by heat-sealing, and has good workability at the corners and around the drain as described above, and the appearance and waterproofing. It aims at providing the waterproof sheet which does not have a problem of quality degradation.

  In order to achieve the above object, in claim 1 of the present invention, a waterproof sheet joining method in which waterproof sheets made of vulcanized rubber are joined to each other by thermal fusion. A thermoplastic resin film is heat-sealed and laminated on the joint surface with the sheet, and the waterproof sheets are then joined together by heat-sealing.

  In Claim 2, it is set as the joining method of the waterproof sheet of Claim 2 whose thickness of a thermoplastic resin film is the range of 30-300 micrometers.

  In Claim 3, it is set as the joining method of the waterproof sheet of Claims 1-2 whose melting | fusing point of a thermoplastic resin film exists in the range of 90-150 degreeC.

  4. The thermoplastic resin film according to claim 4, wherein the material of the thermoplastic resin film is at least one selected from polyethylene, polypropylene, ethylene vinyl acetate, chlorinated polyethylene, chlorinated polypropylene, and maleated ethylene vinyl acetate. As a method of joining the waterproof sheet.

  In claim 1, the waterproof sheets are joined by heat fusion using a heat-sealed laminate of a thermoplastic resin film only on a portion to which the waterproof sheet made of vulcanized rubber is joined. Sheets can be joined, and other parts are not covered with a thermoplastic resin film, so that construction using an adhesive can be performed.

  In claim 2, the thickness of the thermoplastic resin film is limited, the fusion strength between the waterproof sheet and the waterproof sheet can be made sufficiently large, and the problem of warping of the waterproof sheet due to the difference in thermal shrinkage Can be suppressed.

  According to the third aspect, the melting point of the thermoplastic resin film is set within a predetermined range, so that the problem of peeling of the sheet in summer can be solved and the heat fusion workability at the site can be improved.

  In Claim 4, the raw material of a thermoplastic resin film is limited, the fusion | melting property of a thermoplastic resin film and the waterproof sheet which consists of vulcanized rubber is favorable, and the problem of the joining defect by peeling etc. can be reduced.

    Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings.

  The waterproof sheet 1 of the present invention is a waterproof sheet 1 made of vulcanized rubber, and is generated from the ground by providing a gap between the ground and the waterproof sheet by locally fixing without being bonded to the entire surface. It is possible to carry out the construction without much questioning the timing, because there is little problem of escaping steam to escape.

  Adjacent waterproof sheets 1 are bonded by heat fusion in principle, and the thermoplastic resin film 2 is heated and coated on the waterproof sheet 1 only at the joints where the bonding is performed on site as shown in FIG. . For example, as shown in FIG. 2 and FIG. 3, when adjoining the waterproof sheet 10 and the waterproof sheet 20, the end portions on the waterproof sheet 10 side are heat-sealed by overlapping the joint portions of the end portions. When the layers 10a are overlapped, the thermoplastic resin film is heated and laminated on the upper surface of the end portion 10a or the lower surface of the end portion 20a of the waterproof sheet 20 and integrated by fusion.

  As a method of heat lamination, the waterproof sheet side is heated to a temperature equal to or higher than the melting point of the thermoplastic resin film 2 using hot air or a hot iron, and the thermoplastic resin film 2 is stacked in a state where the temperature is sufficiently raised. Using a roller or the like, press the roller while the temperature does not drop. If it does so, the thermoplastic resin film 2 will melt | dissolve with heat | fever, will flow in in the canvas of the surface of a waterproof sheet, and will closely_contact | adhere to a vulcanized rubber.

  When the heat lamination of the thermoplastic resin film to the joint portion of the waterproof sheet is completed, the joint of the waterproof sheet is then joined. 2 and 3, when a thermoplastic resin film is laminated on the lower surface of the end portion 10 a of the waterproof sheet 10, the upper surface of the end portion 20 a of the waterproof sheet 20 is heated to be higher than the melting point of the thermoplastic resin film 2. Raise to high temperature. A heating means such as hot air or a hot iron can also be used for heating. When heated to a temperature equal to or higher than the melting point of the thermoplastic resin film 2, the end portion 10a of the waterproof sheet 10 on which the film has already been laminated is superposed on the end portion 20a whose temperature has increased. As a result, the thermoplastic resin film is melted by heat and flows into the rubber canvas of the end portion 20a so as to be closely adhered and fused. This completes the joining of the waterproof sheets.

  In this example, the thermoplastic resin film is laminated only on one side of the waterproof sheet to be joined, but it is also possible to vulcanize rubber by laminating both waterproof sheets and finally heating and fusing the thermoplastic resin films together. The waterproof sheet made of can be bonded by thermal fusion, but sufficient bonding strength can be obtained even with lamination on only one side, and the work can be reduced.

  In this way, by adopting a joining method in which a thermoplastic resin film is heated and laminated only on a necessary portion of a waterproof sheet made of vulcanized rubber, and the sheet is joined by thermal fusion using the waterproof sheet, the waterproof sheet is adopted. It is more waterproof in terms of workability than bonding by adhesive rather than heat sealing such as storing structures protruding on the base and laying waterproof sheets around the drain without covering unnecessary film. In a special location advantageous also in terms of quality, it is possible to perform processing using an adhesive with the rubber exposed without being covered with a thermoplastic resin film.

  The waterproof sheet used in the present invention is made of vulcanized rubber, and examples of the rubber include ethylene propylene diene monomer (EPDM), isoprene / isobutylene copolymer (IIR) and the like, and it has excellent weather resistance and good rubber elasticity. EPDM having is preferable. The thickness is preferably in the range of 1.0 to 2.5 mm. If the thickness is less than 1.0 mm, the waterproof sheet may be easily broken due to insufficient strength, and if it exceeds 2.5 mm, a step is increased at the joint and the appearance is deteriorated.

  Examples of the thermoplastic resin film 2 include olefin resins such as polyethylene, polypropylene, and ethylene vinyl acetate, modified olefin resins such as chlorinated polyethylene, chlorinated polypropylene, and maleated ethylene vinyl acetate, and olefin thermoplastic elastomers. Can be used. The thickness is preferably a film having a thickness of 30 to 300 μm. If the thickness is less than 30 μm, the thermoplastic resin film cannot sufficiently enter the surface pattern of the waterproof sheet with a canvas, and is in close contact with the waterproof sheet. Sexuality gets worse. Moreover, since it will generate | occur | produce a large warp in the waterproof sheet 1 laminated | stacked by the difference in heat shrinkage when it exceeds 300 micrometers, it is unpreferable.

  Moreover, it is preferable to make the melting point of a thermoplastic resin film into the range of 90-150 degreeC. If the temperature is lower than 90 ° C., there may occur a problem that the waterproof sheet 1 becomes high temperature and peels off in summer, and conversely, if the melting point is higher than 150 ° C., the heat sealing work in the field This is not preferable because workability is remarkably lowered.

  Lamination and integration of the waterproof sheet 1 and the thermoplastic resin film 2 are performed by heat fusion as described above. For example, the waterproof sheet 1 and the thermoplastic resin film 2 can be performed using a hot air heater 15 as shown in FIG. In FIG. 4, hot air is applied to the surface of the waterproof sheet 1 to heat it. The tape-like thermoplastic resin film 2 is wound on the heated waterproof sheet 1 in order from a roll 25 that is rolled up and laminated at the same time, and simultaneously pressed by a pressure roller 26. A windproof plate 16 is attached to the hot air heater 15 to increase the efficiency of heating and prevent the unlaminated film 2 from being melted by hot air.

  Similarly, FIG. 5 is a view in which the thermoplastic resin film 2 is laminated and integrated with the waterproof sheet 1, but the waterproof sheet 1 is heated using a hot iron 17 instead of a hot air heater. In FIG. 6, heating is performed by the hot air heater 15, but in this example, an apparatus in which the hot air generator 15, the roll 25 on which the roll of the thermoplastic resin film 2 is wound and the pressure roller 26 are integrated is used. . Similarly, although not shown, it is also possible to use an apparatus in which a roller on which a hot iron, a roll of the thermoplastic resin film 2 is wound, and a pressure roller are integrated.

  The heating of the waterproof sheet 1 is such that the temperature becomes equal to or higher than the melting point of the thermoplastic resin film 2, and the sheet surface temperature is in the range of 100 to 150 ° C., although it depends on the material of the film 2. If it is less than 100 ° C., the thermoplastic resin film 2 is not sufficiently melted and the fusion strength becomes weak, and if it exceeds 150 ° C., the resin decomposes and deteriorates, and the strength is also lowered. .

  The thermoplastic resin film 2 is used in the form of a tape, and its width is the width of the joint, and is preferably in the range of 30 to 50 mm. If it is less than 30 mm, the bonding strength is not sufficient, causing peeling or defective bonding, and even if it exceeds 50 mm, the strength is excessive, so the maximum is 50 mm.

On the other hand, the waterproof sheet 1 is fixed to the base. As shown in FIG. 7, the fixing plate 31 is first fixedly arranged at predetermined intervals by the anchor member 32 on the base 30 made of concrete or the like on which the waterproof sheet 1 is to be laid. To do. The number of the fixing plates 31 to be arranged is not particularly determined depending on the state of the base 30, but is sufficiently fixed to the base 30 so that the waterproof sheet 1 does not rise due to the influence of wind or the like. It is necessary to arrange them uniformly in the range of about 1 to 4 pieces / m ² .

  After the fixing plate 31 is disposed, the waterproof sheet 1 is then disposed so as to cover it. The waterproof sheet 1 is formed by jointing sheets having a width of 1 to 2 m to form a waterproof sheet 1 having a field size, and is disposed on the entire surface.

  The surface of the fixing plate 31 is covered with a thermoplastic covering material as shown in FIG. 6, and is a portion overlapping the waterproof sheet 1, and is made of metal by the electromagnetic induction heater D from the top of the waterproof sheet 1. The fixing plate 31 is fused and fixed without opening a hole in the waterproof sheet 1 by heating the plate body 33 and melting the covering material 34 on the surface.

  The fixing plate 31 of the present invention includes a plate main body 33 having a diameter of about 60 to 100 mm made of metal such as stainless steel, galvanized steel plate, galvanium steel plate, other inorganic materials, fiber reinforced resin, etc. The coating material 34 covers at least the surface in contact with the waterproof sheet 1 and has a thickness of 0.2 to 1.5 mm. If the thickness is less than 0.2 mm, the strength is insufficient, and there is a possibility that the waterproof sheet 1 may be destroyed when it tries to float up due to a negative wind pressure or the like. If it exceeds 1.5 mm, the step appearing on the waterproof sheet 1 becomes large and the appearance is impaired, which is not preferable.

  As the covering material 34, it is necessary to be a thermoplastic material that can be fused with the rubber constituting the waterproof sheet 1 or the thermoplastic resin film 2 laminated and integrated with the waterproof sheet 1, polyethylene, Examples thereof include olefin resins such as polypropylene and ethylene vinyl acetate, modified olefin resins such as chlorinated polyethylene, chlorinated polypropylene and maleated ethylene vinyl acetate, and olefin thermoplastic elastomers.

  Further, the plate main body 33 and the covering material 34 are fixed, for example, by interposing a fusion or an adhesive. The plate body 33 needs to be a conductor that can be heated by electromagnetic induction heating, and is preferably a rust-proof and weather-resistant one. Specifically, a steel plate, a hot dip galvanized steel plate, a hot dip aluminum plated steel plate. Cold rolled stainless steel plate, aluminum plate, aluminum alloy plate and the like.

  The thickness of the plate body 33 varies depending on the type of metal used, but a thickness of about 0.4 to 2.0 mm is usually used. When the thickness is less than 0.4 mm, the rigidity is low and the shape as a roofing material cannot be maintained. When the thickness exceeds 2.0 mm, the workability becomes poor and the weight increases, which is not preferable. In particular, when stainless steel is used, a thickness of 0.5 to 1.0 mm is most preferable. If it is stainless steel, sufficient rigidity can be obtained in this range, and it can be easily cut with a metal cutting scissor, and the processing at the time of construction is also easy.

The present invention relates to a waterproof sheet used for a mechanical fixing method capable of forming a waterproof layer without being affected by the existing ground state, particularly in a waterproof sheet joining method for forming a waterproof layer on a concrete base. It can be used as a method for joining waterproof sheets that can be joined together by thermal fusion and can also be joined with an adhesive if necessary.

It is sectional drawing of a waterproof sheet. It is sectional drawing of the place which joined the waterproof sheets. It is sectional drawing of the place which completed joining of waterproof sheets. It is a schematic diagram which shows a mode that the waterproof sheet is heated with a hot-air heater. It is a schematic diagram which shows a mode that the waterproof sheet is heated with a hot iron. It is a schematic diagram which shows a mode that the waterproof sheet is heated with another hot-air heater. It is sectional drawing of the place which has fixed the waterproof sheet to the foundation | substrate with the electromagnetic induction heater. It is sectional drawing which shows the example of a fixed plate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Waterproof sheet 2 Thermoplastic resin film 10 Waterproof sheet 10a End part 15 Hot-air heater 16 Windproof board 20 Waterproof sheet 20a End part 25 Roll 26 Rolling roller 30 Base 31 Fixing plate 32 Anchor member

Claims (4)

  In a method for joining waterproof sheets in which waterproof sheets made of vulcanized rubber are joined together by thermal fusion, a thermoplastic resin film is thermally fused and laminated on the joining surface of the waterproof sheet and the other sheet, A method for joining waterproof sheets, characterized in that the waterproof sheets are joined together by thermal fusion.   The waterproof sheet joining method according to claim 2, wherein the thickness of the thermoplastic resin film is in a range of 30 to 300 μm.   The method for joining waterproof sheets according to claim 1 or 2, wherein the thermoplastic resin film has a melting point in the range of 90 to 150 ° C.   The joining of the waterproof sheet according to claim 1 or 2, wherein the material of the thermoplastic resin film is at least one selected from polyethylene, polypropylene, ethylene vinyl acetate, chlorinated polyethylene, chlorinated polypropylene, and maleated ethylene vinyl acetate. Method.

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