JPH0122315B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a material used to prevent the rupture of a waterproof layer of a building roof or the like, and a construction method using this material to prevent the rupture of the waterproof layer. Prevention of rupture of the architectural waterproof layer to prevent fatigue and breakage of the waterproof layer that occurs at the joints between the blocks of waterproof foundations constructed by laying down blocks such as blocks, PC blocks, ALC blocks, wood blocks, etc. Concerning tapes and construction methods for preventing rupture of architectural waterproofing layers.

The roofs of buildings are waterproofed using various waterproofing methods, including asphalt waterproofing. In many cases, insulation boards are laid down to form a waterproof base. However, all of these plates are constantly vibrating due to expansion and contraction due to temperature changes, as well as mechanical vibrations caused by earthquakes and various types of transportation passing nearby, and as a result, the waterproof base material The joint width (width of the gap between the joint parts) between the plate-like bodies forming the plate is constantly expanding and contracting. For this reason, the waterproof layer that is adhesively constructed on the top surface of the waterproof base made of plate-like material is repeatedly subjected to external force that causes enormous expansion and contraction in the minute parts that contact the joints of the plate-like material. This often causes deterioration and breakage due to fatigue.

Solving such problems is one of the important issues in architectural waterproofing, and conventionally, the main methods used are (1) applying additional reinforcing sheets to the joints of the base slab, and (2) A method is used in which the upper waterproof layer is not bonded to the joint portions of the base plate-like body or is partially bonded. In the former method, a reinforcing sheet with a width of about 10 to 30 cm made of glass fiber, synthetic fiber, animal/vegetable fiber, etc., asphalt sheeting, synthetic polymer sheet, etc. is used, but due to the movement of the base, The external forces that occur repeatedly during this process are extremely large, and the waterproof layer undergoes enormous expansion and contraction in the minute areas that contact the joints of the base plate, so simply adding more reinforcing sheets is not enough to withstand it. There are many things. It is also possible to layer several reinforcing sheets to provide sufficient strength to withstand the resistance, but since the reinforcing sheets and the waterproof sheet are in close contact with each other, deformation and stress are concentrated at the edge of the waterproof sheet on the reinforcing sheet side. However, this may cause the waterproof layer to break in that area. In addition, the thickness of the added part becomes abnormally thick,
This will cause various monetary damages.

On the other hand, in the latter method, the waterproof layer is not glued to the joints of the slats with a certain width, or is only partially glued, so the joint width of the base slats expands and becomes waterproof. Even if tension is applied to the layer, the stress is dispersed to the unbonded parts of the waterproof layer, so the waterproof layer does not receive the external force in minute parts, and its elongation rate becomes relatively small. Therefore, this method:
This can be said to be preferable for suppressing fatigue and breakage of the waterproof layer, but since there are parts that are not bonded to the base, the exposed waterproofing method can cause the waterproof layer to deteriorate due to moisture rising through the joints of the base slab. A problem arises in that it causes a blistering phenomenon.

Therefore, in view of the current state of the prior art as described above, it is an object of the present invention to reduce the fatigue of the waterproof layer at the joint portions of waterproof bases constructed with various plate-like materials without causing problems such as blistering. It is an object of the present invention to provide a construction waterproof layer rupture prevention tape useful for preventing rupture, and a construction method using the same.

In the construction waterproof layer tear prevention tape of the present invention, an adhesive material that has high self-adhesiveness and appropriate fluidity even at low temperatures is coated thickly on the non-release treated side of a release sheet that has been subjected to release treatment on only one side. It is overturned.
According to the present invention, when constructing a waterproof base by arranging plate-like bodies, the non-peel-treated side of the release sheet, which has been peel-treated only on one side, is added to the seam between the plate-like bodies at low temperatures. A waterproof base is constructed by pasting a waterproof layer breakage prevention tape made by thickly coating an adhesive material with high self-adhesiveness and appropriate fluidity, and then a waterproof layer is formed over the entire surface of the waterproof base. A construction method for preventing rupture of a building waterproof layer is provided.

The release sheet used in the waterproof layer breakage prevention tape of the present invention is made by coating one side of a base sheet with a conventionally well-known release agent such as silicone resin or fluororesin to impart releasability. That's fine. There are no particular limitations on the material of the base sheet, but in general, kraft paper, brass tape film or sheet is used alone, or fibrous sheets such as paper, nonwoven fabric, woven fabric, plastic film or sheet, or rubber are used. A sheet made of a combination of two or more types of sheets, metal foils, etc. is used. However, it is important to select the base sheet in consideration of the adhesive used when constructing the waterproof layer on the top surface of this tear-preventing tape. For example, when using hot-melt asphalt as the adhesive, heat-resistant It is necessary to select a certain base material sheet, and when using an adhesive containing an organic solvent, a material that is stable against the organic solvent must be selected as the base material sheet. Further, as for the base sheet, one having a higher tensile strength is preferable since tension acts on the breakage prevention tape when the joint width of the base plate is expanded. However, as will be explained later, the non-peelable surface of this base sheet is coated with an adhesive material that has high self-adhesiveness and moderate fluidity even at low temperatures, which causes the joint width of the base plate to fluctuate. The aim of the present invention is to alleviate the external force that is generated on the base sheet when this occurs, by the flow of this adhesive layer. Therefore, the required tensile strength of the base sheet is determined in relation to the fluidity and thickness of the adhesive coated on its non-peelable surface. This means that the tensile strength of the sheet can be low. For example, ordinary kraft paper with a weight of about 70 g/m ² can be used without any practical problems.

The adhesive material coated on the non-peelable surface of the base sheet is
As mentioned above, it must have the function of dispersing external forces generated due to variations in the joint width of the base plate. Particularly at low temperatures, the base plate contracts and its joint width increases, and as a result, tension is applied to the base sheet, so fluidity at low temperatures is an important factor. The tension that acts on the base sheet due to variations in the joint width of the base plate is brought about by shearing force with the base plate, so the coating thickness of the adhesive material also depends on the magnitude of this shear force. It becomes a influencing factor. It goes without saying that the thicker the adhesive layer, the lower the shearing force. If the coating thickness of the adhesive material is thin, not only will the above-mentioned shearing force be increased, but also the surface of the base plate will not be sufficiently smooth, so that sufficient adhesion will not be obtained during construction. Considering this point, it is necessary that the coating thickness of the adhesive material is at least 0.3 mm.
Preferably it is 0.5 mm or more. On the other hand, if the adhesive layer is made too thick, it is not only uneconomical, but in fact, on roofs made using the exposed waterproofing method,
Band-shaped protrusions are observed from the upper surface of the waterproof layer to the joints of the slabs, making it unsightly.In the waterproofing method with a protective layer, the protective layer, such as holding concrete, expands and contracts due to changes in temperature, causing the waterproof layer to expand and contract. There is a risk that the band-shaped protrusion may be damaged. From this point of view, the layer thickness of the adhesive material is generally 5 mm or less, preferably 2 mm or less.

As mentioned above, the adhesive used in the present invention has a high self-adhesive property that allows it to adhere easily and reliably even at temperatures below 0°C, even if the surface of the plate forming the base is rough and not smooth. It must be sticky and have appropriate fluidity. In addition, since the applied adhesive layer will ultimately form part of the waterproof layer, it has a commensurate durability, and in particular has a property that does not reduce adhesive strength due to moisture rising from the base (moisture resistant). gender) is required.

The adhesive material that meets these requirements is preferably rubberized asphalt, which is obtained by blending asphalt with natural or synthetic rubber and/or natural or synthetic resin to modify asphalt so that it has high adhesiveness even at low temperatures. Its composition is usually 5 to 95% by weight of asphalt, preferably 20 to 90% by weight.
% by weight and rubber and/or resin ~5-95% by weight, preferably 10-80% by weight. Examples of rubber components that are mixed into rubberized asphalt include natural rubber, SBR, NBR, BR, IR, CR,
Various natural rubbers such as IIR, EPR, EPDM, PIB, styrene-butadiene-styrene block copolymer, styrene-isobrene-styrene block copolymer, chlorinated polyethylene, ethylene-vinyl acetate copolymer, or recycled rubber thereof One or more of these can be used in either unvulcanized or vulcanized state. Resin components that may be blended alone or together with the rubber components in the rubberized asphalt include rosin and its derivatives (for example, ester gum), tall oil, natural resins such as coumaron-indene resin, various petroleum resins, and polyolefin resins. Synthetic resins such as polybutene (for example, polybutene) can be used singly or in combination of two or more. If necessary, replacing some of these rubber and resin components (up to 50% by weight) with general softening agents such as animal and vegetable oils and mineral oils is also effective in increasing the stickiness of asphalt. .

An example of the waterproof layer breakage prevention tape according to the present invention will be specifically described below.

A polyethylene film having a thickness of 40 μm was laminated on one side of kraft paper having a basis weight of 120 g/m ² , and a release-treated surface was formed by coating the upper surface of this polyethylene film layer with a silicone resin. The following composition (wt%) is applied to the non-release treated side of this release sheet: SBR 30 Process oil 10 Tackifier (phenol formaldehyde resin)
Rubberized asphalt-based adhesive material consisting of a blend of 10 asphalt and 50
The tape was coated to a thickness of 1.0 mm and cut into tapes with a width of 15 cm, each roll being 20 m long and wound into a roll. The waterproof layer breakage prevention tape 10 wound into a roll has a form as shown in the attached FIG. 1. In the figure 1
1 is a base sheet, 12 is a release-treated surface, and 13
indicates the adhesive layer.

The width of the tape is difficult to determine, depending on the dimensional stability of the slab that forms the waterproof base, the accuracy of construction, the type of structure, etc., but if it is too narrow, the ability to break the waterproof layer will substantially decrease. . In addition, if it is too wide, the waterproof layer is not bonded to the top surface of the waterproof layer rupture prevention tape, as will be explained later, so the adhesion strength of the waterproof layer to the base is insufficient when viewed from the entire roof, and the waterproof layer will not be able to adhere to the base during strong winds. There is a risk of being blown away. Therefore, the tape width is generally about 5 to 30 cm, preferably 10 to 30 cm.
About 20cm is practical.

Hereinafter, an embodiment of the waterproof layer breakage prevention method according to the present invention will be described with reference to FIG.

As shown in FIG. 2, when forming a waterproof layer on a roof or the like, various base plates 14 are laid out in order to construct a waterproof base. In the construction method of the present invention,
After applying a primer to this base plate as necessary, apply the waterproof layer breakage prevention tape 16 manufactured as described above so as to cover the joint part 15 between the plates with its peel-treated side facing upward. and paste it.
Next, a waterproof layer 17 is formed in accordance with a conventional method on the entire surface of the waterproof base coated with waterproof layer breakage prevention tape 16. As the material for forming the waterproof layer, conventional general materials such as asphalt waterproofing material, synthetic polymer waterproofing material, etc. can be used.

As described in detail above, the present invention provides a release sheet that has been subjected to a release treatment on only one side, and has a 0.
A waterproof layer rupture prevention tape is a tape-like material coated thickly with an adhesive material that has high self-adhesiveness and appropriate fluidity even at temperatures below ℃, and this is used to prevent waterproofing made from various plate-like materials. By pasting the base with the release-treated side facing up, and then forming a waterproof layer over the entire surface of the waterproof base, it is possible to reduce the effects caused by the expansion and contraction of the waterproof base plate and mechanical vibration. This prevents fatigue and breakage of the waterproof layer at the joints where it is exposed. In this way, when the joint width between the base plates changes, the adhesive material of the waterproof layer breakage prevention tape will have appropriate fluidity even at temperatures below 0°C, and the adhesive material layer By having a moderately thick thickness, the joint area of the base slab,
The shearing force between the base plate and the waterproof layer breakage prevention tape can be alleviated. Furthermore, the top surface of the waterproof tape that breaks the waterproof layer is peeled off, leaving the top waterproof layer virtually unadhered.
The external force transmitted to the waterproof layer will be dispersed over the width of the unbonded portion, and as a result, the waterproof layer will be freed from enormous repeated stretching in minute portions.

In addition, although the waterproof layer is not adhered to the waterproof layer rupture prevention tape, the waterproof layer rupture prevention tape is tightly adhered to the base by an adhesive layer with high self-adhesiveness, so it is essentially a waterproof layer. The entire surface is glued to the base. Therefore, there is no risk that the waterproof layer will blow up during strong winds due to insufficient adhesive strength to the base plate, and the joints of the base plate are sealed with the thickly coated adhesive material that will not pass through the joints. Even if there is moisture that rises, it can be blocked and the blistering phenomenon of the waterproof layer at the joints of the plate-shaped body can also be prevented.

[Brief explanation of drawings]

FIG. 1 is a drawing showing a part of a cross section of a rolled-up waterproof layer breakage prevention tape according to the present invention.
FIG. 2 is a drawing showing a cross section of a waterproof layer constructed by the waterproof layer rupture prevention method according to the present invention. DESCRIPTION OF SYMBOLS 10...Waterproof layer breakage prevention tape, 11...Base material sheet, 12...Fiber treated surface, 13...Adhesive layer, 14...Platform, 15...Joint portion, 16...
...Waterproof layer breakage prevention tape, 17...Waterproof layer.

Claims (1)

[Claims] 1. Asphalt 5-95, which has high self-adhesiveness and appropriate fluidity even at low temperatures, on the non-release treated side of a release sheet that has been subjected to release treatment on only one side.
% by weight, and 95 to 5% by weight of at least one of natural rubber, synthetic rubber, recycled rubber, natural resin, and synthetic resin. 2. The tape according to claim 1, wherein the coating thickness of the adhesive material is 0.3 to 5 mm. 3. When constructing a waterproof base by laying out the plates, the non-peel-treated side of the release sheet, which has only one side treated to release, has high self-adhesion and moderate adhesiveness even at low temperatures, at the joint between the plates. It is made by thickly coating a rubberized alpha adhesive material that has a fluidity of 5 to 95% by weight of asphalt and 95 to 5% by weight of at least one of natural rubber, synthetic rubber, recycled rubber, natural resin, and synthetic resin. A construction method for preventing rupture of a building waterproof layer, which is characterized by pasting a tape for preventing rupture of a building waterproof layer, and then forming a waterproof layer over the entire surface of the waterproof base. 4. The construction method according to claim 3, wherein the coating thickness of the adhesive material is 0.3 to 5 mm.