JPS6053144B2 - Roofing construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises forming a polyurethane lower layer 2 on a rooftop waterproof base 1, laminating a rubber sheet 3 on the polyurethane lower layer 2, and forming a polyurethane upper layer 4 on the rubber sheet 3. The loop ink is a specific invention, and is characterized in that a polyurethane resin is applied to the surface of the waterproof base 1 exposed on the rooftop and cured, then a rubber sheet 3 is laminated, and then the polyurethane resin is applied and cured. The present invention relates to a method for applying loop ink, and its purpose is to provide a method for applying loop ink that is highly elastic and has excellent waterproof properties.

On reinforced concrete rooftops, the main cause of rain leaks is cracks that occur in the concrete frame.

In other words, the concrete structure itself has almost no water permeability, and rainwater infiltrates through cracks. Therefore, if loop ink applied to a reinforced concrete roof does not develop cracks due to cracks in the concrete structure, it can be said that rain leakage is almost completely prevented. However, various studies have been made in the past to prevent cracks in the concrete structure from spreading to the loop ink, but cracks in the concrete structure place a large amount of stress on the loop ink, and cracks can also occur due to temperature differences. Since stress is repeatedly applied to the loop ink as it expands and contracts, it is extremely difficult to prevent cracks in the concrete structure from spreading to the loop ink. That is, conventionally, when waterproofing the rising surface or the top of a rooftop or rooftop parapet, asphalt waterproofing, sheet waterproofing, urethane waterproofing, etc. were applied on the exposed waterproof base such as concrete or mortar. For example, in the case of conventional urethane waterproofing, if a crack 17 occurs in the concrete structure, the urethane waterproofing layer 15
Cracks also formed in the roof, which often caused rain to leak. In some cases, a protective mortar layer 16 was added on top of the conventional waterproof layer to make it walkable.
In this case as well, when cracks 17 occur in the protective mortar layer 16 or leakage occurs, such as floating, it is difficult to investigate the cause because the condition of the waterproof layer is not directly visible. The present invention aims to improve these conventional drawbacks, and will be described in detail below with reference to the accompanying drawings.

The illustrated example is an example of construction on a reinforced concrete rooftop, and loop ink is applied to the reinforced concrete rooftop surface 7. A polyurethane primer layer 5 is applied to the surface of a waterproof base 1 made of concrete exposed on the roof, and a thick hardened polyurethane lower layer (first layer) 2 is formed on top of the primer layer 5. A primer layer 5 similar to the above is further applied on the cured polyurethane lower layer 2, and an adhesive layer 6 of chloroprene or the like is applied thereon.
A plurality of rubber sheets 3 each having a roulette finish on the front and back sides are laminated on top of each other. An adhesive layer 6 similar to that described above is provided on this rubber sheet 3, and a cured polyurethane upper layer (second layer) 4 is formed on the adhesive layer 6. However, the primer layer 5 is applied to the rising surface 9 and top end 10 of the rosette 8.
A polyurethane lower layer 2 is applied through the polyurethane lower layer 2, and a polyurethane upper layer 4 is applied on the polyurethane lower layer 2 through a similar primer layer 5. The reason why the rubber sheet 3 is not pasted on the rose pet 8 is because there is a high risk that the rising corner will float, and a polysulfide or polyurethane caulk 11 is applied to cover the rising corner.
Applying a primer layer 5 as in this example improves the adhesion of each layer, and applying a roulette finish to the rubber sheet 3 roughens the front and back surfaces of the rubber sheet 3, improving adhesion with polyurethane. . The adhesive layer 6 is also interposed between the rubber sheet 3 and the polyurethane upper layer 4 to improve adhesion. Such roofing is constructed, for example, as follows. First, the surface of the concrete exposed on the rooftop is cleaned to remove dirt, etc., and a solvent-type polyurethane-based primer 5 is applied to the surface of the waterproof base 1 using a roller brush, and then a reactive-type two-component primer 5 is applied to the surface of the waterproof base 1. Mix a polyurethane resin, such as a prepolymer solution, and apply with a trowel. The polyurethane lower layer 2 is formed by reaction curing. After reaction curing, a butyl rubber sheet 3 is laminated thereon with a primer layer 5 interposed therebetween using a chloroprene adhesive. After that, the same polyurethane resin as above is applied through the adhesive layer 6 and cured by reaction! Then, a polyurethane upper layer 4 is formed. In the other embodiment shown in FIG. 2, the waterproof base is made by butting together a plurality of precast concrete bodies 12, and one adhesive is attached around the joint part 13 of the precast concrete bodies 12, 12 exposed on the roof. An uncured or semi-vulcanized rubber tape 14 is pasted through the adhesive layer 6, and an adhesive layer 6 is further applied on the rubber tape 14. On top of this, a primer layer 5, a cured polyurethane lower layer 2, A primer layer 5, an adhesive layer 6, a rubber sheet 3, an adhesive layer 6, and a polyurethane upper layer 4 are laminated in this order.

Incidentally, if a top coat such as an acrylic water-based paint is applied on the polyurethane upper layer, walking movement will be improved. In the present invention, a rooftop includes not only a so-called rooftop but also a sloped roof.
The polyurethane used in the present invention is not particularly limited, and one-component moisture-curing polyurethane resins can also be used, but examples include two-component catalyst-curing polyurethane resins and polyol-curing polyurethane resins. .

A polyol-curable polyurethane resin is used by mixing a polyol component and a prepolymer component at a predetermined mixing ratio at the time of coating, and then reacting and curing the resin after coating. Polyol composition. Examples include polyester polyols made of adipic acid, phthalic anhydride, terephthalic acid, etc. and ethylene glycol, propylene glycol, trimethylolpropane, etc., and polyether polyols made of propylene oxide adducts such as glycerin propyl glycol. Various polyisocyanates are used as the prepolymer, and for example, a reaction product of tolylene diisocyanate and trimethylolpropane is used. In addition, these solvents include hydrocarbons that do not have active hydrogen,
Ether, chloride, etc. are used. Pigments and the like are usually used after being dispersed in a polyol component. As described above, in the present invention, a polyurethane resin is applied to the surface of the waterproof base exposed on the rooftop and cured, and then a rubber sheet is pasted and then the polyurethane resin is applied and cured, so that the polyurethane lower layer Roofing can be formed with a three-layer structure consisting of a rubber sheet and a polyurethane upper layer, and even if cracks occur in the waterproof base (concrete frame) and stress due to cracks occurs in the polyurethane lower layer, it has elasticity. This stress will be absorbed by the elasticity of the polyurethane lower layer itself, and since the material laminated to the upper surface of the polyurethane lower layer is a rubber sheet, the elasticity of the polyurethane lower layer will not be inhibited in any way by the similarly elastic rubber sheet. There is no such problem, and the stress bearing capacity of the polyurethane lower layer does not decrease, and it is possible to reliably prevent cracks from spreading from the waterproof base to the polyurethane lower layer, and the polyurethane lower layer and polyurethane upper layer are separated by a rubber sheet. Since the upper and lower layers are completely separated, even if a crack occurs in the lower polyurethane layer, the rubber sheet can prevent the crack from spreading to the upper polyurethane layer. Even if cracks occur, the rubber sheet can prevent the cracks from spreading to the polyurethane lower layer. In addition, during construction, polyurethane resin is applied to the surface of the waterproof base that will be exposed on the roof and cured, so even if there are cracks or irregularities on the surface of the waterproof base, these can be covered with polyurethane resin. It forms a continuous waterproof layer with no seams, and there is no risk of water leaking from the waterproof base.Since a rubber sheet is then laminated on top of this, the comb sheet can also increase waterproof performance and provide reinforcement. can form a waterproof layer,
After that, a polyurethane resin is applied and cured, so the overlapped parts of the rubber sheets can be protected by the polyurethane resin, and this polyurethane resin can form a waterproof layer and also protect the rubber. It can also prevent sheet aging. Moreover, there is no need to apply protective mortar, etc., which shortens the construction period.Also, since a thick three-layer waterproof layer with high elasticity is formed, it is easy to create a walkable exposed roofing that is less likely to cause cracks. It can be constructed. The present invention will be specifically explained below using Examples.

<Example> After cleaning a reinforced concrete roof surface, a solvent-based polyurethane primer was applied to the roof surface using a roller brush.

After this primer dries, mix the following polyol solution and prepolymer solution at a predetermined ratio to give 2 kg/W.
Apply with a trowel and cure to a thickness of about 1.7]n (
A cured polyurethane underlayer having a specific gravity of about 1.2) was formed. A polyurethane primer is applied to this polyurethane lower layer, and a chloroprene adhesive is applied to a thickness of 1mm. butyl rubber sheets were laminated. A chloroprene adhesive was applied once again to the rubber sheets laminated, and the same polyurethane resin as above was further applied to form a cured polyurethane upper layer having a thickness of 1.7T10n. After construction, there were no cracks in each layer of the roofing, and no pinholes or bubbles were observed in the polyurethane upper layer.It has excellent elasticity and waterproofness, and when I walked on the roof, it felt very nice to walk on it. It was good. Polyurethane resin A: polyol solution consisting of adipic acid, 75 parts of ethylene glycol, and 25 parts of polyol solvent (xylene), 25 parts of pigment (chromium oxide green GN) (the above-mentioned solvent may be toluene).

) B: Prepolymer solution Tolylene diisocyanate trime 75 parts Tyrol propane reaction product Solvent (ethyl acetate)
25 copies

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view of one embodiment of the present invention, Fig. 2 is a sectional view of another embodiment, and Fig. 3 is a sectional view of a conventional example. The lower layer 3 is a rubber sheet, and 4 is a polyurethane upper layer.

Claims (1)

[Claims] 1. A roofing construction method characterized by applying polyurethane resin to the surface of a waterproof base exposed on the roof and curing it, then laminating a rubber sheet, and then applying polyurethane resin and curing it.