JP2003096941A - Heat insulating plate used as form in common, its manufacturing method and construction method of floor making use thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat insulating plate used as a form in common having sufficient strength not easily broken even if a person gets on the heat insulating plate used as the form to execute work in a state to mount the heat insulating plate used as the form on timbering and even if a comparatively large volume of concrete is placed on the heat insulating plate used as the form and adhering the heat insulating plate to the concrete at sufficient strength after the concrete has been placed without being required for a nonwoven fabric or the like necessary to adhere to the concrete. SOLUTION: The nonwoven fabric is stuck and laminated on one side of a hard synthetic resin extrusion foam board, the other side on which the nonwoven fabric is not laminated has 10 to 150 μm of the roughness of surface Ra (center line mean value) in the machine direction and the cross sectional direction of the hard synthetic resin extrusion foam board, and the heat insulating plate used for the form has 300 to 4,500 μm of the roughness of surface Sm (average interval of unevenness). The nonwoven fabric has 550 kN/m<2> or more of bending strength in the machine direction and the cross sectional direction, and flexural rigidity has 0.35 N.m<2> or more per 1 cm width in the machine direction and the cross sectional direction.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a heat insulating plate which also serves as a formwork,
The present invention relates to a manufacturing method thereof and a floor construction method using the same.

[0002]

2. Description of the Related Art In a method of constructing a heat-insulating floor constructed by laying a heat insulating material on the lower surface of a first-floor slab of a reinforced concrete structure having an under-floor space, support work such as support, Daihiki, joist in the under-floor space After assembling, place a heat insulating plate that also serves as a formwork, in which a reinforcing sheet (or film) is laminated and integrated on one side of the heat insulating plate, and place it on the support work. There is a known construction method in which the supporting work is installed by leaving the heat insulating plate which also serves as the formwork.

In Japanese Patent Laid-Open No. 3-208944, a heat insulating plate which also serves as a mold is formed by laminating and integrating a plastic film on one surface of a heat insulating plate such as a polystyrene foam plate, with the plastic film side facing down. It is disclosed that it is placed on a supporting structure and concrete is placed on the heat insulating plate that also serves as the formwork. However, in this method, the interface in contact with the concrete is a foamed plastic plate such as a polystyrene foam plate and the concrete, and when an impact is applied to the heat insulating plate that also serves as a formwork at the interface at the time of removing the support work, There was a problem that the heat insulating plate that also serves as the form would come off from the concrete. Also, when a person rides on this formwork and heat insulating plate to work,
Alternatively, when a large amount of concrete is cast on the formwork / heat insulating plate, it is difficult for the plastic film to give sufficient strength to the formwork / heat insulating plate, and cracks are generated in the form / heat insulating plate. I had to be very careful not to let it go.

In Japanese Patent Laid-Open No. 63-161241, Japanese Patent Laid-Open Publication No. 63-161241 discloses a structure of a heat insulating plate which also serves as a formwork and a concrete which is cast from the bottom, a heat insulating layer (synthetic resin foam or the like), a soft surface material having a three-layer structure (reinforcement). Layer (polyester non-woven fabric, etc.), moisture-proof layer (polyethylene non-woven fabric, etc.), adhesive layer (polyester non-woven fabric, etc.)} and concrete in this order or from the bottom, heat insulating layer (synthetic resin foam, etc.), adhesive layer also serving as reinforcing layer (polyester non-woven fabric, etc.) ) And concrete in order, and bending rigidity is 7.5 ×
^{10 4 Kg · cm 2 (73.5N} · m 2) local compression modulus at (1m wide) or ^{40Kg / cm (3.92 × 10 4} N /
m) discloses the above. According to this structure, the interface between the adhesive layer of the polyester nonwoven fabric or the adhesive layer that also serves as the reinforcing layer and the concrete is an anchor effect due to the penetration of concrete between the nonwoven fabrics, and therefore the support work is removed at the interface between the nonwoven fabric and the concrete. Even when a joist or the like is applied to the heat insulating plate that also serves as the formwork during work, the heat insulating plate that also serves as the formwork does not peel off. However, when an impact greater than the strength of the adhesive layer is applied at the interface between the heat insulating layer such as a synthetic resin foam and the reinforcing layer of the polyester nonwoven fabric or the adhesive layer also serving as the reinforcing layer, the insulating layer also serves as the formwork. There was a problem that she would drop out. Furthermore, this formwork / heat insulating plate requires an adhesive layer of non-woven fabric or the like on the adhesive surface with concrete, and it is necessary to give a predetermined bending rigidity and local compressive elastic modulus. Has become.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to allow a person to work while a heat insulating plate which also serves as a formwork is placed on a supporting structure, and which is comparatively placed on the heat insulating plate which also serves as a formwork. Even when a large amount of concrete is poured, this heat insulating plate that also serves as a form has sufficient strength and is difficult to crack, and it does not require a non-woven fabric or the like to adhere to the concrete, It is an object of the present invention to provide a heat insulating plate that also serves as a formwork, in which the combined heat insulating plate adheres to concrete with sufficient strength and is difficult to peel off. Another object of the present invention is to provide a method of manufacturing such a heat insulating plate that also serves as a mold. Still another object of the present invention is to provide a method of constructing a floor containing concrete having such a heat insulating plate that also serves as a formwork at the bottom.

[0006]

The first aspect of the present invention is as follows.
On one side of the heat insulating plate made of hard synthetic resin extruded foam plate,
Woven fabric is pasted and laminated, and the non-woven fabric is not laminated
One side is the machine direction of the rigid synthetic resin extruded foam plate and
Surface roughness Ra (center line average value) is 10 to 1 in both transverse directions.
50 μm and surface roughness Sm (average interval of irregularities) is 3
It is a heat insulating plate that also serves as a mold and has a size of 00 to 4500 μm. Starting
Another aspect of Ming is that the bending strength is both machine and transverse.
550 kN / m²That is the bending stiffness in the machine direction and
0.35 N · m per 1 cm width in both transverse directions ²Is over
It is the heat insulating plate that also serves as the formwork. Another aspect of the invention is a rigid
Non-woven fabric is attached to one side of a heat insulating plate made of synthetic resin extruded foam plate.
It is made by laminating and laminating the foamed board on which the non-woven fabric is not laminated.
Characterized by roughening the other side by sanding
It is a method of manufacturing the heat insulating plate that also serves as the mold. Other aspects of the invention
Like, the non-woven fabric is laminated on the heat insulating plate that also serves as the formwork.
Place it on the support work with the side facing down, and cut this formwork
Characterized by placing concrete on the hot plate and placing concrete
This is the floor construction method.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A heat insulating plate serving also as a mold according to the present invention will be described with reference to FIG. In the heat insulating plate 1 also serving as a mold, a nonwoven fabric 3 is laminated on one side of a hard synthetic resin extruded foam plate 2. In the present invention, the hard synthetic resin extruded foam plate is a generic term for a foam plate formed by foaming a synthetic resin such as polystyrene, polypropylene, polyacrylic, etc. by extrusion foaming molding, and the shape is flat. It is preferable but not limited to it and is optional. The thickness is also arbitrary, but a thickness of about 10 to 200 mm is preferable from the viewpoint of workability after installation and heat insulation. Also, the density is preferably about 15 to 75 kg / m ³ from the viewpoint of heat insulation and mechanical strength. The machine direction (MD) in the extruded foam plate described below is the flow direction (extrusion direction) during extrusion foaming, and the transverse direction (TD) is M
The direction is perpendicular to D.

In the present invention, a nonwoven fabric is stuck and laminated on one surface of the hard synthetic resin extruded foam plate, while the other surface is a surface in both the machine direction and the transverse direction of the hard synthetic resin extruded foam plate. The roughness Ra is 10 to 150 μm, and the surface roughness Sm is 300 to 4500 μm. Since the hard synthetic resin extruded foam plate of the present invention has Ra of 10 μm or more and Sm of 300 μm or more, even if concrete is directly cast on this surface, the concrete enters the unevenness of the surface and firmly adheres thereto. . On the other hand, Ra is 1
When it exceeds 50 μm or Sm exceeds 4500 μm, the hard synthetic resin extruded foam plate is easily cracked, which is not preferable. More preferable ranges are Ra of 10 to 50 μm and Sm of 300 to 1500 μm. A good method of forming such roughness on the other surface of the hard synthetic resin extruded foam plate is sanding.

FIG. 2 is a conceptual diagram in the case of sanding the surface of a hard synthetic resin extruded foam plate. The hard synthetic resin extruded foam plate 2 is carried on the conveyor belt 4 and is conveyed in the direction of the arrow while being pressed by the pressing roller 5 at the upper portion. A sander belt 6 is provided in the middle of the conveyance, and the surface of the sander belt 6 is provided with many irregularities. The foam plate passes through between the conveyor belt 4 and the sander belt 6 during transportation, and at this time, the conveyor belt 4
If the distance h between the sander belt 6 and the sander belt 6 is made smaller than the original thickness H of the foamed plate, the upper surface of the hard synthetic resin extruded foamed plate 2 is sanded by the unevenness of the surface of the sander belt 6 to form a rough surface. (Rough surface).

A rigid synthetic resin extruded foam plate of the type used in the present invention has a very low elongation and a low resistance to bending. Therefore, if such a rigid synthetic resin extruded foam plate is left to let a person or concrete rest on a joist and bend it as it is, cracks will occur on the surface that expands with a slight curve. When it runs and bends further, it breaks immediately. In the present invention, a large load is applied to the hard synthetic resin extruded foam plate by sticking a nonwoven fabric on the surface opposite to the surface on which the load of the hard synthetic resin extruded foam plate is applied, and when a bending force is exerted, It is possible to greatly prevent the occurrence of cracks or cracks on the surface to which the non-woven fabric is attached and to withstand a large load. That is, the bending rigidity and the bending strength of the heat insulating plate which also serves as the mold of the present invention are increased. The formwork / heat insulating plate of the present invention has a bending strength of 550 kN / m ² or more in the machine direction and the transverse direction, and a bending rigidity of 0.35 N · m ² or more per 1 cm width in both the machine direction and the transverse direction. Is preferred. To obtain such bending strength and bending rigidity, a thickness of 10 to 2
A rigid synthetic resin extruded foam plate having a diameter of about 00 mm and a density of about 15 to 75 kg / m ³ and a non-woven fabric may be bonded together using an adhesive.

According to experiments conducted by the present inventors, the non-woven fabric used is short fiber of rayon, cotton, polyester, polypropylene, nylon or the like or a blend thereof, or long fiber of polypropylene, polyester, nylon or the like, or a long fiber of these blends, or Glass fiber, SUS
A sheet-like one obtained by arranging fibers or the like in a web-like or mat-like manner by a usual method and joining the fibers with each other while using an adhesive if necessary is preferable. Of these, polyester nonwoven fabrics are preferable because they are excellent in chemical resistance, weather resistance and durability. When the nonwoven fabric has directionality, at least the breaking elongation in the bending direction is 20% or more, and the tensile strength is 20.
It is preferably N / 5 cm (JIS L-1096: cut slip method) or more, more preferably a breaking elongation of 30% or more and a tensile strength of 40 N / 5 cm (4 kgf / 5c.
The range of m) or more is suitable.

It is also possible to use a directional non-woven fabric,
According to the experiments by the present inventors, in this case, the fiber is attached to the rigid synthetic resin extruded foam plate so that the direction of the fiber coincides with the direction in which the load of the mold and heat insulating plate is applied to bend the fiber. This makes it possible to obtain a product that can be bent by applying a larger load. The adhesive strength between the hard synthetic resin extruded foam plate and the non-woven fabric needs to be strong enough to follow the elongation when curved. As an adhesive capable of obtaining this adhesive strength, according to the experiments of the present inventors, a hot-melt adhesive represented by an ethylene-vinyl acetate copolymer, a two-component epoxy resin type, a one-component urethane type Reaction-curable adhesives such as, vinyl acetate-based, urethane-based emulsion-based, two-component polyester-based, urethane-based solvent-based, etc. For this, it is effective to use a hot roll to press and bond a non-woven fabric laminated surface with an adhesive coated by an extrusion method, roll coater method, etc., and a reaction-curable adhesive. In the case of using, the method in which one coated by a roll coater method or the like is pressure-bonded is effective.

The amount of the adhesive applied is not particularly limited, but if it is too small, peeling may occur between the hard synthetic resin extruded foam plate and the nonwoven fabric when curved, and if it is too thick, the elongation of the nonwoven fabric is restricted. It is uneconomical not only because it is fearful but also because the adhesive is unnecessarily used.
About 60 g / m ² (dry) is suitable.

In the production of the heat insulating plate which also serves as the mold by the production method of the present invention, the plate-like hard synthetic resin extruded foam plate is molded by the usual means as described above, and one surface is sanded. A desired non-woven fabric is attached to the other surface by using an ordinary laminator or the like.

In order to carry out the method of constructing a floor according to the present invention, for example, support work, a splint and a joist (edge joist) are installed, and the non-woven fabric is laminated on the joist with the heat insulating plate serving also as the formwork of the present invention. The supporting side is placed downward on the supporting work, and the reinforcing bar is placed on this form and heat insulating plate, concrete is placed, and the supporting work, the splints and joists are disassembled and they are put away. As described above, when the non-woven fabric is applied downward, the heat insulating plate also serving as the mold of the present invention can withstand a large load, and at the same time, it becomes hard to adhere to concrete and peel off.

The case of laying the formwork and heat insulating plate of the present invention on the lower surface of the first floor slab of a reinforced concrete structure having an underfloor space has been described above. The present invention is not limited to the above, and of course, it can be used, for example, when it is attached to the side wall of a reinforced concrete structure and laid.

[0017]

According to the present invention, even if a person rides on the support with a heat insulating plate also used as a formwork, a relatively large amount of concrete is placed on the heat insulating plate also used as a formwork. Even when cast, the heat insulating plate that also serves as a formwork has sufficient strength and is difficult to crack. Also, without using a non-woven fabric or the like for bonding with concrete, the heat insulating plate that also serves as a formwork can be used after placing concrete. (EN) Provided is a heat insulating plate that also serves as a formwork, which adheres to concrete with sufficient strength and is difficult to peel off.

[0018]

[Examples] (Examples 1, Comparative Examples 1 and 2) Polyester non-woven fabric as a non-woven fabric (manufactured by Asahi Kasei Corp., Spunbond P)
03070 (trademark), thickness 0.50 mm, basis weight 70 g /
m ² , tensile strength: MD = 186 N / 50 mm width; TD = 88
N / 50 mm width, breaking strength: MD = 60%; TD = 70
%) To an extruded expanded polystyrene plate (Ethren foam SU (trademark, manufactured by Sekisui Plastics Co., Ltd., thickness: 30 mm) with a density of 33.5 kg / m ^{3 and} an ethylene vinyl acetate hot melt as an adhesive. Type adhesive (Hirodine # 757
3 (trademark, manufactured by Hirodyne Co., Ltd.) was applied at a rate of about 30 g / m ² , and pressure-bonded with a hot roll. Using the non-woven fabric-attached expanded polystyrene plate (hereinafter abbreviated as “reinforced XPS”) thus obtained, the following adhesive strength comparison test was performed.

Specimen type (A) A non-woven fabric surface of reinforced XPS was impregnated with mortar (Comparative Example 1). (B) One in which reinforced XPS was sanded on the side opposite to the nonwoven fabric surface, and mortar was driven into this surface (Example 1). (C) A reinforced mortar XPS with polystyrene when extruding polystyrene with mortar driven into the skin (Comparative Example 2).

Preparation of Specimen (1) Specimen Dimension: Reinforcement XPS part: 100 × 100 × 50
(Thickness) mm; mortar part: 100 × 100 × 150 (thickness) mm (2) Mortar condition: cement 1 / sand 3 * slump
Mortar was poured into a 18 mm (3) mold and vibrated with a metal rod 10 times. (4) Curing condition: 30 days at room temperature. A specific form of this test body is shown in FIGS. 3 (A) and 3 (B). In this figure, 11 is a mortar, 12 is a formwork, 1
3 is reinforced XPS, 14 and 24 are T-shaped steel jigs, and 15 and 25 are plywood. The plywood 15 and the mortar 11 were fixed to each other by curing and hardening the mortar 11 while the plywood 15 and the uncured mortar 11 were penetrated by four wood screws having a length of 50 mm. An epoxy adhesive was used as the adhesive for the plywood 25 and the reinforcing XPS 13. The adhesion between the mortar 11 and the reinforcing XPS 13 is according to the above (A) to (C). T
An epoxy-based adhesive was used to bond the jigs 14 and 24 made of shaped steel to the plywoods 15 and 25.

(Tensile test conditions) (1) Testing machine; universal testing machine (strograph) (2) Operating range: 200 Kgf (1.96 kN) / full scale (3) Tensile speed: 5 mm / min (Fig. 3 (B In (), the T-shaped steel jig 24 is fixed, and the T-shaped steel jig 14 is pulled in the direction of the arrow.) (3) The maximum load is determined and divided by the adhesive area to determine the adhesive strength per 1 cm 2. (Measurement of Surface Roughness) Handysurf (trademark) E-35A, a surface roughness measuring instrument, for the surface of the reinforcing XPS used for the test bodies (A), (B) and (C) on the side where the mortar is to be driven.
(Manufactured by Tokyo Seimitsu Co., Ltd.) was used to measure the surface roughness Ra (center line average value) and the surface roughness Sm (average interval of irregularities). (1) Specimen (A): The surface roughness of the reinforced XPS nonwoven fabric is measured. (2) Specimen (B) ... Measure the surface roughness of the sanding surface of the reinforced XPS. (3) Specimen (C) ... Measure the surface roughness of the skin surface of the reinforced XPS.

[Table 1] Test results (the number of samples (N) in the test was 5, and the average of the measured values was taken.) Adhesive strength test body (N / cm ² ) Ra (μm) Sm (μm ) Comparative Example 1 (A) 10.4 MD 6.7 MD 244.8 TD 7.2 TD 175.8 Example 1 (B) 13.5 MD 15.5 MD 345.3 TD 12.9 TD 383.5 Comparative Example 2 (C) 4.0 MD 4.6 MD 293.3 TD 5.5 TD 208.9

(Discussion) In the test body (A), the maximum value of the adhesive strength between the mortar and the non-woven fabric could not be measured because peeling occurred between the non-woven fabric of the test body and the expanded polystyrene plate first. The adhesive strength (10,4 N / cm ² ) or more between the nonwoven fabric and the expanded polystyrene plate by the melt is maintained. However, in terms of implementation, the adhesive strength between the non-woven fabric and expanded polystyrene plate by hot melt is
Since the adhesive strength between the non-woven fabric and the mortar is lower, it is not appropriate to drive the mortar into this surface (the non-woven fabric-side surface of the heat insulating plate that also serves as the formwork). Specimen (C) is reinforced from concrete X
Adhesive strength with which PS can be easily peeled off by hand (Adhesive strength 4.0N
/ Cm ² ). In the test body (B), peeling occurred first between the non-woven fabric of the test body and the expanded polystyrene plate, so that the peeled non-woven fabric and the expanded polystyrene plate were re-bonded with an epoxy adhesive and tested. The adhesive strength was 13.5 N / cm ² , which was the maximum value among the three. Therefore, it can be said that it is best to drive mortar on the sander surface.

(Example 2, Comparative Examples 3 to 7) (Bending test) Various plastic films and non-woven fabrics were used as candidates for a sheet or film material for reinforcing a rigid synthetic resin extruded foam plate, and a density of 33.5 kg / m. ³ extruded expanded polystyrene board (Eslen foam SU (trademark,
Sekisui Plastics Co., Ltd., thickness 30mm) (hereinafter sometimes referred to as "foam"), an ethylene vinyl acetate hot-melt adhesive (Hirodine # 75)
73 (trademark, manufactured by Hirodyne Co., Ltd.) was applied at a rate of about 30 g / m ² and pressure-bonded with a hot roll. As the non-woven fabric, a polyester non-woven fabric (manufactured by Asahi Kasei Corporation, Spunbond P03070 (trademark), thickness 0.50 mm, basis weight 70 g / m ² , tensile strength: MD = 186 N / 50 mm width; T
D = 88 N / 50 mm width, breaking strength: MD = 60%; TD
= 70% was used.

The bending strength and bending rigidity of the obtained reinforced expanded polystyrene plate (hereinafter referred to as "reinforcement XPS '") were measured according to JIS K7221. The number of samples in the bending test was 5, and the measured values of these were averaged. The edge span width was 200 mm and the crosshead was 10 mm / min. A load was applied from above the reinforcing XPS 'with the film (sheet) side facing down. The results are shown in Table 2. In Table 2, the non-woven fabric sample film is Example 2 and the others are comparative examples.

[Table 2] Flexural rigidity Example (1 cm width comparative example Sample per bending strength) No. Film direction (kN / m ² ) (N · m ² ) Conclusion Reason Ratio 3 OPP, 15 μm TD 557 0.456 Poor strength , Warpage problem (HMA, 15μm) MD 403 0.227 No cost ratio 4 PET, 12μm TD 645 0.507 Poor Same as above (HMA, 15μm) MD 400 0.248 5 LLDPE, 30μm TD 578 0.542 Good strength, warpage problem (EVA, 10μm ) MD 347 0.223 no cost appropriateness, construction validate ratio 6 LLDPE, 130μm TD 583 0.441 ibid (EVA, 20μm) MD 408 0.191 ratio 7 LLDPE, 30μm TD 510 0.457 poor strength, warpage, one (EVA, 10 [mu] m) MD 338 0.174 paste two unchanged and paste the high cost real-2 non-woven fabric TD 782 0.715 good strength, no warping problem. Cost slightly higher MD 596 0.451. Construction validate Note: OPP: biaxially oriented polypropylene film PET: biaxially stretched polyester film LLDPE: biaxially oriented linear low density polyethylene film HMA: ethylene vinyl acetate based hot melt adhesive EVA: ethylene-vinyl acetate copolymer ( Adhesive) MD: Machine direction TD: Direction perpendicular to machine direction

(Construction Verification) Based on the test results of the samples that were good in the bending test, the edge pitch was calculated to be 200 mm. I actually constructed and walked at this pitch. Since the strength in the TD direction was high, the reinforcing XPS 'long side direction was applied parallel to the edge thickness. The results are shown in Table 3.
Shown in.

[Table 3] Example Comparative Example Sample Result Conclusion Reason Comparative Example 8 LLDPE, 30 μm Foam, film failure Problem with normal walking (EVA, 10 μm) Both cracks are not recommended, but in consideration of on- site construction, it is not recommended Comparative Example 9 LLDPE, 130μm Foam cracks only, no problem for safety, ( EVA, 20μm) Film does not crack, cracking of reinforced XPS ' is not desirable Example 3 Non-woven fabric Good under extreme load Bending strength is strongest, extreme No problem as long as the film does not crack under the load

From the results shown in Table 3, the formwork / heat insulating plate of the present invention is operated by a person riding on the support work, and a relatively large amount of heat is applied on the formwork / heat insulating plate. It is clear that even when concrete is placed, the heat insulating plate that also serves as a mold has sufficient strength and is hard to break.

[0030]

According to the present invention, even if a person rides on the support with a heat insulating plate also used as a formwork, a relatively large amount of concrete is placed on the heat insulating plate also used as a formwork. Even when cast, the heat insulating plate that also serves as a formwork has sufficient strength and is difficult to crack. Also, without using a non-woven fabric or the like for bonding with concrete, the heat insulating plate that also serves as a formwork can be used after placing concrete. It adheres to concrete with sufficient strength and is difficult to peel off,
A heat insulating plate that also serves as a form is provided.

[Brief description of drawings]

FIG. 1 is a perspective view of an example of a heat insulating plate that also serves as a mold of the present invention.

FIG. 2 is a conceptual diagram when a surface of a hard synthetic resin extruded foam plate is sanded.

FIG. 3 is a cross-sectional view showing the state of mortar implantation when measuring the adhesive strength to concrete of the expanded polystyrene plate to which the nonwoven fabric is attached in Example 1 and Comparative Examples 1 and 2.

[Explanation of symbols]

1. Insulation plate that also serves as a formwork 2. Hard synthetic resin extruded foam board 3 ... Nonwoven fabric 4 ... Conveyor belt 5 ... Pressing roller 6 ... Thunder belt 11 ... Mortar 12 ... Formwork 13 ... Nonwoven fabric-attached expanded polystyrene plate 14, 24 ... T-shaped steel jig 15, 25 ... Plywood

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Claims (4)

[Claims] 1. A non-woven fabric is stuck and laminated on one surface of a hard synthetic resin extruded foam plate, and the other surface on which the non-woven fabric is not laminated is in both a machine direction and a transverse direction of the hard synthetic resin extruded foam plate. Surface roughness Ra (center line average value) is 10
A heat insulating plate which is 150 μm and also has a surface roughness Sm (average interval of concavities and convexities) of 300 to 4500 μm. 2. The bending strength is 5 in both the machine direction and the transverse direction.
The heat insulating plate also as a mold according to claim 1, having a bending rigidity of 50 kN / m ² or more and a bending rigidity of 0.35 N · m ² or more per 1 cm width in both the machine direction and the transverse direction. 3. A hard synthetic resin extruded foam plate is laminated with a non-woven fabric on one side thereof, and the other side of the foam plate on which the non-woven fabric is not laminated is roughened by sanding. 2. The method for producing a heat insulating plate that also serves as a mold according to 2. 4. The formwork / heat insulating plate according to claim 1 or 2 is placed on a supporting structure with the side on which the non-woven fabric is laminated facing downward, and placed on the formwork / heat insulating plate. A method for constructing a floor, which is characterized by making a streak and placing concrete.