JPH045634Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention relates to a heat-insulating and waterproof structure constructed on the roof of a concrete building, etc.

<Conventional Technology> In general, insulation and waterproofing work is performed on the roof of a concrete building. As shown in FIG. 2, this heat-insulating waterproof layer is formed by applying a thin layer of primer (adhesive) 12 to the surface of the concrete layer 11, and then spraying a foamed-in-place urethane heat-insulating waterproof material 13 to a predetermined thickness.
Next, a normal waterproof cement mortar 14 is applied to a predetermined thickness, and finally, a coating material 15 whose main ingredient is epoxy resin is applied thinly as a protective coating for the waterproof cement mortar 14. In addition, when using mesh cloth with waterproof cement mortar 14, in-situ foamed urethane insulation and waterproofing material 13
A thin layer of adhesive may be applied to the surface of the

<Problems to be solved by the invention> However, when such insulation and waterproofing work is carried out over, for example, approximately 100 m ^{2 or} more, cracks are likely to occur on the waterproofing cement mortar side, which has a higher coefficient of thermal expansion than the in-situ foamed urethane insulation and waterproofing material. When rainwater enters between the waterproof cement mortar 14 and the foamed urethane insulation and waterproofing material 13 through these cracks, this rainwater evaporates in the summer and freezes and expands in the winter, causing the waterproofing cement mortar 14 to become the foamed urethane insulation and waterproofing material. If the front surface is peeled off from 13 and left as is, the cracks will further expand and the in-situ foamed urethane insulation and waterproofing material 13 will be exposed to sunlight, causing rapid aging and loss of insulation and waterproofing effect.

<Means for solving the problem> This idea was made in view of the above, and its gist is to insulate the lower layer with in-situ foamed urethane through countless punched holes formed in the punched sheet. The elastic mortar on the upper layer side is dot-bonded to the waterproofing material, and the difference in thermal expansion coefficient between the in-situ foamed urethane insulation waterproofing material and the elastic mortar can be measured through the punched holes in the punched sheet with the elastic mortar interposed between the two. The idea is to achieve excellent heat-insulating and waterproofing effects by absorbing and relaxing the material through point adhesion and the flexibility of the elastic mortar itself.

<Example> In Fig. 1, 1 is a concrete layer, 2 is a primer thinly applied on the concrete layer 1, and 3 is a concrete layer.
is an in-situ foamed urethane insulation and waterproofing material that was spray-coated onto Primer 2 to a thickness of approximately 20 mm. 7 is a urethane sealant packed into the corner between the rising part of the concrete layer 1 and the in-situ foamed urethane insulation and waterproofing material 3; 8 is a urethane waterproofing material or acrylic waterproofing material applied above the urethane sealant 7; It is.

4 is a sheet adhesive applied to the top surface of the in-situ foamed urethane heat-insulating and waterproof material 3, and 5 is a punched sheet made of polyester nonwoven fabric attached to the sheet adhesive 4 (thickness approximately 1.3 mm, punch hole diameter 5-6 mm, punched) The hole spacing is approximately 20 to 30 mm). 6 is punching sheet 5
Elastic mortar (viscosity (cps) 100 to 500) applied to a thickness of 2 to 5 mm so as to be point-adhered to the in-situ foamed urethane insulation and waterproofing material 3 through punch holes 5A on the top surface.
A self-adhesive kneaded material containing acrylic emulsion, cement, and fine aggregate in a ratio of 1:1:2)
It is.

The heat-insulating and waterproof structure according to this invention is constructed on the roof of a concrete building, etc. in the following order.

(b) Apply a thin layer of primer 2 (adhesive) onto concrete layer 1.

(b) Spray urethane foam insulation and waterproofing material 3 onto the primer 2 to a thickness of approximately 20 mm.

(c) Pack the urethane sealant 7 into the corner between the rising part of the concrete layer 1 and the in-situ foamed urethane insulation and waterproofing material 3.

(d) Apply urethane waterproofing material 8 to the rising part of concrete layer 1 above urethane sealant 7.

(e) Before applying elastic mortar 6, which will be described later, on the in-situ foamed urethane heat-insulating and waterproof material 3, a sheet adhesive 4 for temporarily fixing the punching sheet 5 is applied to prevent the punching sheet 5 from shifting due to wind or the like.

(f) Paste the punched sheet 5 made of polyester nonwoven fabric onto the sheet adhesive 4.

(g) Apply elastic mortar 6 onto the punched sheet 5 with a trowel, and point-adhere the elastic mortar 6 to the heat insulating and waterproof material 3 through the punched sheet punch holes 5A.

In the heat-insulating waterproof structure constructed in this way, the elastic mortar 6 on the upper layer side is not entirely bonded to the in-situ foamed urethane heat-insulating waterproof material 3 on the lower layer side as in the conventional case, but the punched holes 5A of the punched sheet 5
Coupled with the fact that the elastic mortar 6 itself has appropriate flexibility, the difference in thermal expansion coefficient between the in-situ foamed urethane insulation and waterproofing material 3 and the elastic mortar 6 is absorbed and alleviated. Cracks in the waterproof mortar as in conventional examples no longer occur, and excellent insulation and waterproofing effects are achieved.

<Effects of the invention> As explained above, in this invention, the elastic mortar on the upper layer side is dot-bonded to the in-situ foamed urethane insulation and waterproofing material on the lower layer side through the punched holes of the punched sheet, and the elastic mortar itself becomes flexible. As a result, the difference in thermal expansion coefficient between the two is absorbed and alleviated, and as a result, cracks in the waterproof mortar as in the conventional example do not occur, and the excellent heat insulation and waterproof effect is maintained.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a main part of a heat-insulating waterproof structure according to an embodiment of this invention, and FIG. 2 is a cross-sectional view of a main part of a heat-insulating waterproof structure according to a conventional example. 1... Concrete layer, 3... Urethane foam insulation and waterproofing material, 5... Punching sheet, 5A...
...Punched holes, 6...Elastic mortar.

Claims (1)

[Scope of utility model registration request] This is an insulation waterproofing structure constructed on the roof of a concrete building, where the elastic mortar on the upper layer is dot-bonded to the in-situ foamed urethane insulation and waterproofing material on the lower layer through punched holes in a punched sheet. structure.