JPH05214804A - Construction method for underfloor ground material and oa floor - Google Patents

Abstract

PURPOSE:To facilitate wiring work in a way that the mark of the legs of a floor piece with legs are left formed by a method wherein a synthetic resin film or a reinforcing layer formed of chromium is laminated between upper and lower foamed layers to form an underfloor ground material. CONSTITUTION:An underfloor ground material 4 is formed in three-layer lamination structure of upper and lower foamed layers 2 and 3 and a reinforcing layer 1. The upper foamed layer 2 of the three-layer lamination structure is a layer in which the leg marks of a floor piece are formed by placing the legs of a floor piece with legs on the underfloor ground material, and formed of a closed-cell foam of thermoplastic resin and an expansion ratio is set to 10-40 magnification. Further, the lower foamed layer 3 is formed of a soft synthetic resin foam having flexibility for regulating non-flatness of a ground surface formed of concrete slag and an expansion rate is set to 10-40 magnification. The reinforcing layer 1 serving as a core is a synthetic resin film or split cloth having a porosity 20-60%. This constitution prevents the occurrence of a damage owing to a concentrated load on the leg part of the floor piece with legs.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floor base material to be laid under a floor (hereinafter referred to as an OA floor) for installing a large computer or other OA equipment and a method for constructing an OA floor.

[0002]

2. Description of the Related Art Generally, in order to lay an OA floor on a floor base material, construction is carried out according to the following procedure (see FIG. 4).

A floor base material (12) is laid on a base made of a concrete slab (11). Adjacent floor base material (12)
The ends of each other shall be butted. On the floor base material (12), a plurality of floor pieces (14) with legs that constitute the OA floor (13) are temporarily placed, and the tops of the floor pieces (14) with legs are brought into close contact with each other. Remove the plurality of legged floor pieces (14) from above the floor underlayment (12). As a result, the footprint of the floor piece with legs remains on the surface of the floor base material (12). After 1-2 days, avoid the footprints on the floor with legs and base material
Place the wire cord on top of (12). Re-mount the floor pieces with legs (14) on the floor base material (12). Thus, the OA floor (13) is constructed.

In order to facilitate the above-mentioned wiring work, the floor base material is such that the footprints of the floor pieces with legs are clearly formed, and the unevenness of the base surface composed of the concrete slab (11) is adjusted. It must be flexible enough to allow it.

Conventionally, such a floor base material is a sheet having a thickness of about 2 mm, which is composed of a single layer of a soft polyvinyl chloride foam having an expansion ratio of about 30 to 40 times (cc / g), and an expansion ratio of about 30 times (cc / g). A sheet of about 2 mm thickness consisting of a single layer of g) flame-retardant crosslinked polyethylene foam was used.

[0006]

However, the conventional floor base materials as described above have a concentrated load on the legs of the floor piece with legs (14) as the person walks on the floor after the OA floor construction. Therefore, there is a problem that it is easy to tear, and since it easily grows under a low load, workability such as deployment at the time of laying and end butting is not good.

In view of the above points, an object of the present invention is to keep the characteristic that the footprints of the floor pieces with legs are precisely formed and the flexibility is such that unevenness due to unevenness of the underlying surface can be adjusted. Another object of the present invention is to provide a construction method for a floor base material and wiring, which is not liable to be broken even by a concentrated load on the leg portion of the floor piece with legs and has good workability such as deployment during installation and end butting.

[0008]

A floor base material according to the present invention is made to achieve the above object, and the floor base material according to claim 1 is an upper foam layer / reinforcing layer / lower foam layer. The upper foam layer has a foaming ratio of 10 to 40.
It is characterized in that it is made of double-cell thermoplastic resin closed-cell foam, the lower foam layer is made of soft synthetic resin foam, and the reinforcing layer is made of synthetic resin film or cloth.

Further, the floor base material according to claim 2 has a two-layer laminated structure of a reinforcing layer / a lower foam layer, and the reinforcing layer has 20 to 6 layers.
It is characterized in that it is made of a split cloth having a porosity of 0%, and the lower foam layer is made of a closed-cell foam of a thermoplastic resin having an expansion ratio of 10 to 40 times.

Further, in the method for constructing wiring or the like according to claim 3, the floor base material according to claim 1 or 2 is laid on the floor base material, and the floor piece with legs is temporarily placed on the floor base material. This method is characterized in that the floor piece is laid, the floor piece is removed, wirings and the like are arranged so as to avoid the footprints of the floor piece left on the floor base material, and then the floor piece is laid. Hereinafter, each constituent layer of the floor base material according to the present invention will be described in detail.

1. Floor base material according to claim 1) In the three-layer laminated structure of i) upper foam layer / reinforcing layer / lower foam layer, first, the reinforcing layer as a core material is a synthetic resin film or cloth. Consists of.

The raw material synthetic resin of the film constituting the reinforcing layer is not particularly limited, but is a living temperature range (10 to 4).
A material having a large tensile Young's modulus at 0 ° C.) is preferable. Examples of such synthetic resin include polypropylene (P
P), a homopolymer such as low density or high density polyethylene (PE), a copolymer based on these, or a blended product thereof. Examples of the cloth that constitutes the reinforcing layer include split cloth, ginseng cloth, non-woven cloth, and glass cloth.

A split cloth is a synthetic resin film such as polyethylene or polypropylene that is stretched in a uniaxial direction, the filaments that are finely cut along the stretching direction are arranged in parallel, and the filaments are laminated in the weft and weft directions. It is a woven fabric in which the intersections of the two are bonded together.

Nonwoven fabrics include rayon, cellulose,
Fibers such as nylon, polypropylene and polyethylene glycol terephthalate may be used alone or as a mixed product thereof. The non-woven fabric also includes felt. Non-woven fabric,
The fibers of the glass cloth may be short fibers or long fibers.

The reinforcing layer is preferably flame retarded. As a method of making the reinforcing layer flame-retardant, for example, there is a method of adding a system of an additive type flame retardant / flame retardant aid to a raw material polyethylene resin. Examples of the additive type flame retardant / flame retardant auxiliary system include halogen compounds / antimony compounds, halogen compounds / boron compounds / antimony compounds, and phosphoric acid ester / antimony compounds. The mixing ratio of the additive type flame retardant / flame retardant auxiliary system is preferably in the range of 3/1 to 2/1.

The thickness of the reinforcing layer is preferably 0.02 to 0.
It is 3 mm.

Ii) Next, in the three-layer laminated structure of the upper foam layer / reinforcing layer / lower foam layer, the upper foam layer has the legs of the floor piece with legs on the floor base material placed thereon, Is a layer in which footprints are formed and is made of a closed-cell foam of a thermoplastic resin.

The expansion ratio of this foam is 10 to 40 times, preferably 20 to 30 times (cc / g). When the expansion ratio is less than 10 times (cc / g), the hardness of the foam increases and it is difficult to form footprints. Conversely, the expansion ratio is 40 times (c
If it exceeds c / g), the hardness of the foam decreases and the formation of footprints is facilitated, but the strength is low and it is easy to tear.

As the raw material thermoplastic resin for the upper foam layer,
Low density polyethylene (LDPE) obtained by polymerizing ethylene monomer, 7 copolymerized with ethylene monomer and other monomer, for example, ethylene-vinyl acetate copolymer (EVA), ethylene-propylene copolymer (EP),
Examples include ethylene-acrylic acid copolymer (EAA), blended products of these homopolymers and copolymers, blended products of copolymers, and the like.

As the thermoplastic resin for the upper foamed layer, a cross-linking type which is cross-linked between molecules is preferable, and it is excellent in mechanical strength and heat resistance. The upper foam layer in the present invention is a sheet-like material of the closed-cell foam of the thermoplastic resin.

To obtain a foam from these resins, a foaming agent and a crosslinking agent (not necessary in the case of radiation crosslinking) are mixed in an ethylene resin, and the resin is formed into a sheet with an extruder or a calender roll. Producing a foamable sheet, crosslinking is performed by irradiation or heating at a temperature below the decomposition temperature of the foaming agent, and then heating at a temperature above the decomposition temperature of the foaming agent to perform foaming or simultaneous crosslinking and foaming. Method is adopted.

As the foaming agent, azo compounds such as azodicarbonamide and azobisisobutyronitrile and nitroso compounds such as dinitrosopentamethylenetetramine are suitable. Further, as the cross-linking agent, an organic peroxide such as dicumyl peroxide is suitable.

Further, a foaming aid such as urea or a metal salt of a carboxylic acid may be added to the raw material of the closed cell foam sheet of the thermoplastic resin. Also, if necessary, a filler,
Antiaging agents, coloring agents and the like may be added.

As the cell form of the upper foamed layer, substantially closed cell is used. The reason is that the closed-cell foam has high rigidity and exhibits a good cushioning effect.
Also, it is excellent in heat retention effect. However, open cells may be mixed to the extent that rigidity is not impaired.

It is desirable that the upper foam layer is made flame-retardant. The flame-retardant method for the upper foam layer is the same as the method described for the reinforcing layer.

The thickness of the upper foam layer is preferably 0.5 to 2
mm.

Particularly suitable as the upper foam layer is a closed-cell foam of flame-retarded crosslinked polyethylene, for example, a layer made of Sekisui Chemical Co., Ltd. under the trade name "Softlon".

Iii) Of the three-layer laminated structure of upper foam layer / reinforcing layer / lower foam layer, the lower foam layer has flexibility so as to adjust the unevenness of the surface of the foundation made of concrete slab. It consists of a soft synthetic resin foam.

As the raw material synthetic resin for the lower foam layer, low density polyethylene (LD) prepared by polymerizing ethylene monomer is used.
PE), a copolymer of an ethylene monomer and another monomer, for example, an ethylene-vinyl acetate copolymer (EV
A), ethylene-propylene copolymer (EP), ethylene-acrylic acid copolymer (EAA), blended products of these homopolymers and copolymers, blended products of copolymers, and the like. ..

As the synthetic resin for the lower foamed layer, a crosslinked type resin is also preferable from the viewpoint of strength. The method of foaming the resin is the same as the method described for the upper foam layer. The expansion ratio of this foam is 10 to 40 times, preferably 20 to 3
It is 0 times (cc / g). The bubble form of the lower foam layer is also preferably substantially closed cells for the same reason as in the upper foam layer.

It is desirable that the lower foam layer is also flame-retardant. The method for making the lower foam layer flame-retardant is the same as the method described for the reinforcing layer.

The thickness of the lower foam layer is preferably 0.5 to 2
mm.

Particularly suitable as the lower foam layer is a closed-cell foam of flame-retardant crosslinked polyethylene, for example, a layer made of Sekisui Chemical Co., Ltd. under the trade name "Softlon".

Iv) As a method of adhesively joining the three layers of the upper foam layer, the reinforcing layer and the lower foam layer, an extrusion lamination method, a dry lamination method or the like can be adopted.

The construction method for laying the OA floor on the floor base material according to the present invention is the same as the method described above with reference to FIG.

2. Floor base material according to claim 2, of the two-layer laminated structure of reinforcing layer / lower foam layer, the reinforcing layer is 2
A split cloth having a porosity of 0 to 60% is used.

The split cloth is a woven cloth in which filaments made of synthetic resin stretched as described above are juxtaposed, and the filaments are laminated so as to be orthogonal to the longitudinal direction, and the intersections of the filaments are adhered to each other. It is a thing.

When the split cloth is manufactured, a heat-fusible adhesive is applied to one surface of one of the filaments in the warp and weft directions, and the other filaments are orthogonal to this in the molten state of the adhesive. Then, they are laminated and bonded. Therefore, in the filamentous material to which the adhesive has been applied, the adhesive that does not exhibit adhesiveness at room temperature is exposed at the portions other than the intersections.

The reason why this split cloth is particularly preferable is that it has a particularly excellent tensile strength, that it is made of a thin film-like thread and has good adhesiveness to the foam layer, and that it is inexpensive.

The width of the filamentous material is preferably 1.0 to 10 mm and the thickness thereof is preferably about 0.02 to 0.04 mm, and the flame retardant material is preferable. The flame-retardant method is the same as that of the reinforcing layer of the floor base material according to claim 1 described above. Further, it is preferable that the filamentous material is matt-treated, because it reduces the reflection of light and makes it easy to see the footprints, and also improves the adhesiveness to the foam layer and the appearance.

Here, the ratio of the area of the gap generated between the filamentous materials to the fixed area of the split cloth is defined as the porosity. The porosity is 2
The range of 0 to 60% is preferable, and more preferably 25 to 5
5%. If the porosity is less than 20%, the density of the filamentous material is so high that the footprint of the floor piece leg becomes unclear, and if it exceeds 60%, the reinforcing effect is low and it is easy to tear due to the concentrated load of the leg of the floor piece. Become.

The closed-cell foam of the thermoplastic resin of the lower foam layer is the same thermoplastic resin as that of the lower foam layer used in the floor base material according to claim 1 and has an expansion ratio of 10. ~ 40 times that used. The thermoplastic resin is preferably a cross-linking type resin from the viewpoint of strength and is preferably flame-retarded. The flame-retardant method is also the same as that of the reinforcing layer of the floor base material according to claim 1.

For laminating and adhering the reinforcing layer and the lower foam layer, for example, the surface of the split cloth where the heat-fusible adhesive is exposed is outside and heated to 80 to 100 ° C. A method of heating the split cloth on the surface of the heat roll, melting the heat-fusible adhesive and passing it through the pinch roll while adhering it to the foam layer to bond, or exposing the heat-fusible adhesive of the split cloth. It is possible to employ a method in which the surface on which the foam layer is formed and the surface of the foam layer are heated by a gas burner or electric heat and passed through a pinch roll to adhere them. Of course, a solvent type adhesive or an emulsion type adhesive may be used for the adhesion, but since the solvent volatilization and drying steps are required, it is preferable to use the above heat-fusible adhesive.

[0044]

The upper foam layer forms the footprint of the floor piece with legs on the upper surface of the floor base material, and facilitates the subsequent wiring work and OA floor construction.

The reinforcing layer according to claim 1 joins the upper foam layer and the lower foam layer, and increases the tensile strength in the longitudinal and transverse directions of both foam layers to facilitate the work of laying an OA floor. It should withstand the weight pressure of the strip.

The reinforcing layer according to claim 2 reinforces the lower foamed layer by increasing the tensile strength in the longitudinal and transverse directions, and at the same time, exposes the foamed layer from the gap to facilitate the footprint of the floor piece, It should withstand the weight pressure of the strip.

The lower foam layer according to claim 1 adjusts the unevenness due to the unevenness of the floor base surface and stabilizes the OA floor laid. The lower foam layer according to claim 2 forms a footprint of a floor piece mainly in a portion exposed from a gap of a reinforcing layer, and adjusts unevenness due to unevenness of a floor base surface to stabilize a laid OA floor. Let

[0048]

Embodiments of the present invention will be described below. (Example 1) FIG. 1 is a cross-sectional view showing a floor base material according to claim 1, wherein a flame-retardant polypropylene (PP) and flame-retardant polyethylene (PE) blend (a large amount of PP) resin is formed into a film. At the same time as extruding into a film, the flame retardant low density polyethylene (LDP)
E) Closed-cell crosslinked foam sheet (trade name “Softlon” manufactured by Sekisui Chemical Co., Ltd.) (2) and (3) were supplied, and these three layers were pressure-bonded with a pinch roll. Thus, a strip-shaped floor base material (4) having a three-layer laminated structure of the upper foam layer (2) / reinforcing layer (1) / lower foam layer (3) was produced by the so-called extrusion lamination method.

The thickness of the reinforcing layer (1) of the obtained floor base material (4) of the three-layer laminated structure was 0.1 mm, and the expansion ratio of the upper and lower foam layers (2) and (3) was 30 times (cc / g). The upper and lower foam layers (2) and (3) each have a thickness of 1 mm, a total width of 1050 mm, and a total length of 20 m.

With the lower foam layer (3) of this floor base material (4) facing down, the floor base material (4) is lined up on the floor base surface made of concrete slab (11) as shown in FIG. The occurrence of breakage of the floor base material during this work was investigated. After that, the floor pieces (14) are placed on top of this, and an ordinary passenger car is reciprocated 20 times to check the strength against the load. One day later, the floor pieces (14) are removed and the floor base material is removed.
The state of tearing of (4) and the state of footprints were examined. Also, after the wiring work was completed, the floor piece (4) was placed again and the state of uneven adjustment of the floor base surface was examined. The above results are shown in Table 1.

(Embodiment 2) FIG. 2 is a sectional view showing a floor base material according to claim 2, and FIG. 3 is an enlarged plan view showing a split cloth used as a reinforcing layer. In FIG. 3, width 3 mm and thickness 27 μ made of low density polyethylene
Apply the heat-sealable adhesive (52) to one side of the m-shaped filamentous material, and arrange it in parallel at a rate of 4 threads per inch,
1) On the other hand, the same filamentous material as the above, which is not coated with an adhesive, is also arranged in parallel at a rate of 4 threads per inch to form the weft thread (53), which are laminated in the longitudinal direction and the intersection point Was bonded with the above adhesive to prepare a split cloth (5a) in which the heat-fusible adhesive (52) was exposed on one surface of the warp other than the intersection of the warp and the weft. The porosity of this split cloth (5a) was about 28%.

Next, the surface of the split cloth (5a) on which the heat-fusible adhesive (52) is exposed is placed outside and applied to a hot roll heated to about 100 ° C. to apply the heat-fusible adhesive. Closed-cell cross-linked foam sheet (3a) made of melted and flame-retarded low-density polyethylene (expansion ratio 30 times, thickness 2 mm, Sekisui Chemical Co., Ltd.
The product name “Softlon”) is pasted together and shown in FIG.
A floor base material (4a) having a layered structure was obtained.

This floor base material (4a) was laid in the same manner as in Example 1 and the same items were examined. The results are shown in Table 1.
Shown in.

(Comparative Example 1) Expansion ratio of about 30 times (cc /
A floor base material consisting of a single layer of g) flame-retarded crosslinked polyethylene foam having a thickness of about 2 mm was produced.

This was laid in the same manner as in Example 1, and the same items were examined. The results are shown in Table 1.

(Comparative Example 2) Nonwoven fabric using fibers made of a mixed resin of polyethylene and polypropylene (weight per unit area 2
0 g / m ² ) was bonded to the same crosslinked foam sheet used in Example 2 by a heat fusion method and laminated to prepare a floor base material.

This was laid in the same manner as in Example 1, and the same items were examined. The results are shown in Table 1. Performance Test The flooring base materials obtained in Examples 1 and 2 and Comparative Examples 1 and 2 were measured for tensile strength, elongation and residual dents. The results are shown in Table 1.

[0058]

[Table 1]

The tensile strength and the elongation are both JIS
It measured according to the method of K6767. The residual dent is
80 kg on a circular surface with a diameter of 50 mm of a sample placed on a flat surface
The load is removed 1 hour after the load is applied, and the restoration rate of the dent due to the load after 5 minutes, 30 minutes, and 60 minutes is measured.

As is clear from Table 1, the floor base materials according to Examples 1 and 2 of the present invention are
It was confirmed that the footprint of the floor piece can be clearly formed while it is excellent in tensile strength and elongation. Also, since it is reinforced by the reinforcing layer, it can withstand the load due to the laying work and the running test of the car, and it is clear that the unevenness of the surface of the concrete slab is absorbed and the unsteady adjustment can be performed by using this. is there.

[0061]

EFFECTS OF THE INVENTION Since the flooring material according to the present invention has a large tensile strength in the longitudinal and transverse directions of the foamed layer due to the reinforcing layer, there is no fear of being broken even by a concentrated load on the leg portion of the floor piece with legs, Workability such as unfolding when laying and abutting the ends is remarkably good. In addition, since the floor base material is such that the footprints of the floor pieces with legs are clearly formed, wiring work on the OA floor can be easily performed. Furthermore, it has the flexibility to adjust the unevenness of the surface of the floor base made of concrete slab, and the wiring and the like can be easily constructed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a floor base material according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a floor base material according to another embodiment of the present invention.

FIG. 3 is an enlarged plan view of the split cloth.

FIG. 4 is a perspective view showing a laid state of an OA floor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reinforcement layer 2 Upper foam layer 3,3a Lower foam layer 4,4a, 12 Floor base material 5a Split cloth 51 Warp yarn 52 Weft yarn 53 Heat fusion adhesive 11 Concrete slab 13 OA floor 14 Floor piece with legs

Claims (3)

[Claims] 1. A three-layer laminated structure of an upper foam layer / reinforcing layer / lower foam layer, wherein the upper foam layer comprises a closed-cell foam of a thermoplastic resin having a foaming ratio of 10 to 40 times, and the lower foam layer. Is a soft synthetic resin foam and the reinforcing layer is a synthetic resin film or cloth. 2. A two-layer laminated structure of reinforcing layer / lower foam layer, wherein the reinforcing layer is a split cloth having a porosity of 20 to 60%, and the lower foam layer has an expansion ratio of 10 to 40 times. A floor base material comprising a closed-cell foam of a thermoplastic resin. 3. The floor base material according to claim 1 or 2 is laid on a floor base material, a floor piece with legs is temporarily placed on the floor base material, and the floor piece is removed to remove the floor base material. A method for constructing an OA floor, which comprises laying floor pieces after arranging wiring and the like while avoiding footprints left on the floor pieces.