JPH0359265A - Heat insulating board concurrently serving as formwork - Google Patents

Abstract

PURPOSE:To obtain a heat insulating board concurrently serving as a formwork by coupling a meshy sheet on one face or both faces of a heat insulating plate made of a synthetic resin foam with a cement material as a reinforcing material, and laminating a nonwoven fabric on its outer face. CONSTITUTION:A heat insulating plate 2 and a surface material 7 formed with a reinforcing material with through holes, a cement material layer 4 and a nonwoven fabric 6 are integrally connected to constitute a heat insulating board 1 concurrently serving as a formwork. A polystyrene foam is used for the heat insulating plate 2 in view of the performance and cost, and its thickness is set to about 2-10cm. A sheet of cheese cloth made of synthetic fibers is used for the reinforcing material 3, and it is connected on one face of the heat insulating plate 2 with a cement material such as Portland cement. The nonwoven fabric 6 is laminated on the outermost layer to improve the bending strength of the heat insulating board 1. The heat insulating board 1 concurrently serving as a concrete formwork can be obtained.

Description

[Detailed description of the invention] [Industrial application field] The present invention is used as a formwork during concrete pouring,
This invention relates to a heat insulating board that is used as a formwork and is used as a heat insulating material by being integrated with a concrete structure after concrete hardens.

[Conventional technology]

Conventionally, when constructing a concrete structure, formwork panels made of veneer plywood, etc. are placed facing each other at a predetermined distance and fixed using a fixing material called Bata material, and then concrete is placed between the two formwork panels. The method used is to pour concrete and allow it to harden, then dismantle the formwork panels. Alternatively, a foam board can be temporarily fixed to the concrete pouring side of the formwork panel with nails, etc., and then concrete is poured into the frame, and after the concrete has hardened, only the formwork panel is removed and the foam board is integrated with the concrete wall. Alternatively, a foam board is used as it is as a formwork panel to form a frame, and the foam board is integrated with the concrete without being removed after the concrete hardens to form a heat insulating structure.

[Problem to be solved by the invention]

However, when using formwork panels such as henia plywood, it is necessary to dismantle the formwork panels and transport the dismantled formwork panels after the concrete has hardened, which requires considerable time and effort, which inevitably increases costs. In addition, these operations may be unfavorable for safety reasons.
It was a problem. Furthermore, when using a formwork panel made only of plywood plywood, it was necessary to perform further insulation work after pouring the concrete in order to create a heat-insulating structure.

On the other hand, according to the method of temporarily fixing a foam board to the concrete pouring surface side of a formwork panel made of plywood veneer, etc., and pouring concrete, there is no need to perform insulation work after the concrete hardens, but it is similar to the method described above. In addition, it is necessary to dismantle the formwork panel, and concrete tends to flow from above between the foam board and the formwork panel, and as a result, the foam that was temporarily fixed during concrete pouring is likely to separate from the formwork panel. There was a problem in that the concrete hardened when the foam board dug into the concrete. In addition, when using a single foam board as a heat insulating material that also serves as a panel, it is not necessary to dismantle the form panel, but it is required to have the strength to withstand the pressure of poured concrete, so it is necessary to make the foam board thicker than necessary. However, there were problems such as the need to extremely narrow the spacing between the buffing materials used to fix the framework for reinforcement. Moreover, in this case, even if it is thought that the concrete has been sufficiently reinforced, the pressure of the concrete may increase locally, causing damage to the foam board from these areas.
Concrete spills often occurred. Furthermore, when foam boards are used with formwork panels such as veneer plywood, or as formwork panels as they are, and are attached to concrete walls as a heat insulator, the synthetic resin foam boards are exposed on the surface, so reinforcing steel welding is required. There was also the problem that the foam board could catch fire or melt due to sparks.

[Means to solve the problem]

The present invention has been made in view of the above points, and an object of the present invention is to provide a heat insulating board that can also be used as a formwork and which can solve the problems of the prior art.

That is, in the present invention, a reinforcing material made of a sheet-like material having a plurality of through holes on at least one side of a heat insulating board made of a synthetic resin foam is bonded with a cement-based material, and a reinforcing material made of a sheet-like material having a plurality of through holes is bonded with a cement-based material layer. The gist is a heat insulating board that also serves as a formwork and is characterized by having a nonwoven fabric laminated on its outer surface.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 shows an embodiment of a heat insulating board l that also serves as a formwork according to the present invention, in which 2 is a heat insulating board, 3 is a reinforcing material made of a sheet having a plurality of through holes, 4 is a cement material layer, 6 is a non-woven fabric; 7 is a surface material consisting of a reinforcing material 3, a cement-based material layer 4, and a non-woven fabric 6; the reinforcing material 3 is completely (or partially covered) covered with the cement-based material; It is integrally bonded to the surface of the heat insulating board 2.

Examples of the heat insulating board 2 include foam boards made of polystyrene foam, polyethylene foam, polypropylene foam, polyvinyl chloride foam, polyurethane foam, phenolic resin foam, etc. Considering this, a foam board made of polystyrene foam is preferred. The thickness of this heat insulating board 2 is preferably 2 to 10 cm.

As the reinforcing material 3 made of a sheet-like material having a plurality of through holes, a net-like sheet or a sheet without through holes in which a plurality of punched holes are provided is usually used. Specific examples of such sheet-like materials include cheesecloth made of synthetic fibers, long glass fiber cloth, metallic mesh, metal lath, etc.
Examples include net-like sheets such as wire lath, sheets made of synthetic resin, etc., in which a plurality of punched holes in shapes such as circular, elliptical, and polygonal shapes are provided over the entire surface. The main polymers constituting the above synthetic fibers and synthetic resins include polyvinyl alcohol, various nylons, polyvinyl chloride,
Polyvinylidene chloride, polypropylene, polyethylene,
Examples include polyethylene terephthalate, polybutylene terephthalate, and polyacrylic.

As the cement material used to integrally bond the reinforcing material 3 to the heat insulating plate 2, Portland cement, granulated blast furnace slag cement, Altanna cement, etc. can be used. When the reinforcing material 3 is integrally bonded to the heat insulating board 2, the reinforcing material 3 is placed on one or both sides of the insulating board 2, and a mixture of water and the cement-based compound is further laminated from one or both sides of the reinforcing material 3. However, at this time, aggregates and various additives may be added to the mixture as necessary. In particular, when a mixture of water and cement material is used, which contains calcium chloride as a main component and one or more salts selected from iron salts, potassium salts, and ammonium salts as the additive, the heat insulating board 2 It is preferable because it has excellent adhesion with. This also makes it possible to speed up the curing speed of the cementitious material and shorten the manufacturing cycle. Moreover, it has the advantage of exhibiting high strength after curing. The amount of these additives added to the cementitious material is preferably 1 to 50 parts by weight per 100 parts by weight of the cementitious material. Furthermore, if an emulsion containing a polymer such as ethylene-vinyl acetate copolymer as a solid content is added in the same amount as the above additives, it is possible to improve the adhesion of the cement material to the heat insulating board 2 and the nonwoven fabric 6. , the flexibility after curing can be increased.

The insulation board 1 of the present invention has a structure in which the nonwoven fabric 6 is laminated on the outer surface of the cement 1-based material layer 4. Due to this structure, the bending strength of the entire insulation board can be improved, and It also prevents damage to the board during transportation and storage. The nonwoven fabric 6 is usually laminated on the outer surface of the moisture-containing cement material layer 4 when the reinforcing material 3 is joined and integrated with the heat insulating board 2 using a cement material, and the nonwoven fabric 6 is bonded to the heat insulating board 2 by hardening of the cement material. be integrated. In this case, it is possible to prevent the moisture-containing cement material from rapidly drying out by being stuck in the nonwoven fabric, and to allow the cement material to cure in a wet state, thereby promoting development of sufficient strength of the cement material. Examples of the fibers constituting the nonwoven fabric include fibers made of the same polymer as those constituting the reinforcing material 3.

It is desirable that the heat insulating board 1 which can also be used as a formwork of the present invention has the surface material 7 placed at least on the concrete pouring surface side when used as a form, but as shown in FIG. It is also possible to adopt a configuration in which 7 is formed.

The insulation board 1 of the present invention is used as one or both sides of a formwork when constructing concrete walls, concrete floors, concrete beams, concrete columns, etc. FIG. 3 shows that the boards l of the present invention shown in FIG.
This is an example of a heat insulating concrete wall formed by integrating the board 1 and the board 1. In this case, since the surface material 7 is formed on the concrete pouring surface side, the adhesive strength between the concrete 5 and the board 1 is excellent, and the concrete 5 and the board 1 are reliably joined and integrated.

Furthermore, as shown in FIG. 2, since the board 1 is used in which the surface material 7 is provided on both sides of the heat insulating board 2, the heat insulating board is not exposed, and since it is the surface material 7 that is exposed on the surface side, Even if sparks fly during reinforcing steel welding, the insulation board may catch fire.
There is no risk of the insulation board melting.

In addition, although FIG. 3 shows a case where walls etc. are formed using the board 1 of the present invention on both sides of the formwork, the board 1 of the present invention is used only on one side, and veneer is formed on the other side. The frame may be constructed using a conventional formwork panel made of plywood or the like, and only the formwork panel made of veneer plywood or the like is removed after the concrete has hardened. Even in this case, one side is coated with the board 1 of the present invention. Since it is integrated with the concrete 5 as a heat insulating material and is installed as is, the work is simplified compared to the conventional method using formwork panels that need to be dismantled after construction on both sides.

〔Effect of the invention〕

As explained above, the insulating board that also serves as a formwork of the present invention has a reinforcing material made of a sheet-like material having a plurality of through holes bonded to at least one side of the insulating board with a cement-based material, and a cement-based material. Since the outer surface of the material layer is laminated with non-woven fabric, it has sufficient strength to be used as a formwork without being used in conjunction with conventional formwork panels such as veneered plywood, and it is also easy to use with concrete afterwards. Since it is integrated and used as a heat insulating material, there is no need to dismantle the formwork panels after the concrete has hardened, unlike conventional formwork, and there is no need for dismantling or transporting dismantled panels, so construction costs are low. Moreover, even if a heat-insulating structure is required, there is no need to carry out heat-insulating work in a separate process after constructing concrete walls, concrete floors, etc., and the heat-insulating work can be done at the same time as concrete walls, etc., reducing total costs. I can do it. Furthermore, the board of the present invention is lighter in weight than conventional formwork panels and is easier to handle and erect. Further, the board of the present invention has excellent adhesion to concrete when the surface material is placed on the concrete pouring side, and the board and concrete can be reliably joined and integrated. Furthermore, if a board of the present invention is used in which the surface material is placed on both sides of the insulation board, the rigidity of the side opposite to the concrete placement side of the board, and by extension the rigidity of the entire board, will be further improved, and the fire resistance will also be improved. do.

In addition, in this case, the surface material located on the opposite side to the concrete pouring side makes it possible to improve the straightness (coating finish) with wet materials such as plaster and plastering materials, which are applied afterwards, and also to improve the straightness during drying or drying of these materials. This has the effect of preventing subsequent cranking.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a cross-sectional view of a heat insulating board that also serves as a formwork of the present invention; FIG. 2 is a cross-sectional view of a different embodiment of the board of the present invention; and FIG. It is a sectional view showing an example of the concrete structure constructed using it. 1...Insulation board that also serves as formwork 2...Insulation board 3...
・Reinforcement material 4...Cement material layer 5...Concrete 6...Nonwoven fabric

Claims (1)

[Claims] A reinforcing material made of a sheet-like material having a plurality of through holes is integrally bonded with a cement material on at least one side of a heat insulating board made of a synthetic resin foam, and a non-woven fabric is further provided on the outer surface side of the cement material layer. A heat insulating board that doubles as formwork and is characterized by being laminated.