JP2941503B2 - Beam material with excellent fire resistance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to beams and columns for buildings having excellent fire resistance and workability, and reducing the consumption of wood, a natural resource.
About.

[0002]

2. Description of the Related Art Conventionally, pillars and beams of a building are cut out from natural wood, or wood chips hardened into a predetermined shape. However, these types of wooden pillars consume a large amount of natural resources, and there is a problem of environmental degradation caused by overforested forests. In addition, there is a problem in terms of safety because the fire is ignited in the event of a fire.

[0003] In this connection, in order to reduce the consumption of wood and to provide functions such as fire resistance, sound insulation, heat insulation, etc., inorganic fibers are incorporated into the plate material used for floors and walls. Are being used. For example, Japanese Unexamined Utility Model Publication No. 61-47309 discloses a soundproof heat insulating material in which a mat made of inorganic fibers is sandwiched between synthetic resin sheets. The incorporated inorganic fibers absorb the transmitted sound energy as vibration, attenuate the sound volume radiated to the outside, and also function as a heat insulating layer.

[0004] When the packing density of the inorganic fibers is increased and the board has self-supporting properties in the board material containing the inorganic fibers, the wood layer used as the surface layer can be thinned. As a result, wood consumption is reduced.

[0005]

With respect to the plate material, various proposals incorporating inorganic fibers have hitherto been made. However, as for the column material, there has not been put into practical use any material which reduces the amount of wood consumption by using inorganic fibers. This is derived from a usage mode peculiar to a beam and column material in which a cut or a nail is frequently made in the beam or column to fix the plate material to the beam or column.

That is, in the case of simply attaching inorganic fibers to the surface of a pillar material, the inorganic fibers fall off the surface as fiber waste due to cutting or nailing. The part from which the inorganic fibers have fallen has a different surface appearance from the other parts and deteriorates the finish. Therefore, it is necessary to perform an operation of replenishing the dropped parts after the construction with the inorganic fibers to obtain the same surface appearance. In addition, the work environment is deteriorated by the dropped fiber waste, which tends to be disliked by workers.

[0007] The present invention has been devised to solve such a problem, and detaches fiber waste by bonding an inorganic fiber felt to a wood core material using an adhesive resin. It is an object of the present invention to provide a pillar material which can be easily constructed without causing problems such as the above and has good fire resistance with reduced consumption of wood.

[0008]

In order to achieve the above object, the pillar material according to the present invention comprises a felt layer made of an inorganic fiber bonded to a surface of a wood core material, and the felt layer is made of an inorganic fiber. It is obtained by fibrillating and mixing with a flexible binder resin and then heat molding, and is further characterized in that it is bonded to the wood core material with an adhesive resin having good familiarity with the flexible binder resin.

As the felt layer, inorganic fibers such as rock wool and glass wool and a flexible binder resin are defibrated, mixed, heated and formed into a sheet or felt having a predetermined thickness. is there. Although rock wool or glass wool can be used alone, it is preferable to add 50 wt% or less of glass wool for the purpose of improving the strength of rock wool. A wooden surface layer can be further attached to the outside of the felt layer.

As shown in FIG. 1, the felt layer 10 is bonded to the wood core material 20 by an adhesive resin. The flexible binder resin that bonds the inorganic fibers to each other, the heat-fusible resin, and the adhesive resin that bonds the felt layer to the base layer and the surface layer may be of the same type or different types as long as the familiarity between the two is good. Is also good. A wooden surface layer 30 is further attached to the surface of the felt layer 10 as necessary.

As the flexible binder resin, vinyl chloride,
Fibrous, granular, or powdery thermoplastic resins such as styrene, polyolefin, polyester, and nylon resins. Preferably, a heat-fused fiber formed of a plurality of resins having different softening temperatures, which are formed into a fibrous shape, is exemplified. Examples of the heat sealing resin include those made of resins having different melting points such as polyethylene / polypropylene. Examples of the adhesive resin for joining the felt layer 10 to the wood core material 20 include a water-based emulsion type adhesive such as water-based ethylene vinyl acetate and vinyl urethane, and a solvent-type chloroprene rubber-based adhesive.

The woody surface layer 30 has a good feeling to the human body, is bonded to give a certain degree of respiratory action, and is a relatively thin layer. In addition, the woody surface layer 30 can be omitted depending on the use mode of the pillar material. As the wood core material 20 and the wood surface layer 30, a material obtained by cutting natural wood or a material obtained by compressing a wood chip is used.

[0013]

[Function] The felt layer made of inorganic fiber is, for example, defibrated and mixed with rock wool and a flexible binder resin, and is heated and formed into a mat or sheet shape. Needling can also be performed. In this case, by heating at this stage or after the production, the adhesive strength of the binder resin is developed, and the inorganic fibers are bonded to each other.

The obtained felt layer 10 made of inorganic fiber
As shown in FIG. 1, a wooden core material 20 and a wooden surface layer 30
Is sandwiched between. An adhesive resin is applied to the surface of the wooden core material 20 and the wooden surface layer 30 with respect to the felt layer 10 in advance. Then, the felt layer 10 is wrapped around the peripheral surface of the wooden core material 10, and is pressed from above and below and from left and right while the wooden surface layer 30 is further superimposed. Thereby, the felt layer 10 is integrally joined to the wood core material 20 and the wood surface layer 30 with the adhesive resin. Note that the bonding of the felt layer 10 and the wooden surface layer 30 to the wooden core material 20 does not need to be performed at once on the entire surface of the wooden core material 20, but is performed on an appropriate surface. Further, instead of the wooden core material 20 and the wooden surface layer 30, an adhesive resin may be applied to both surfaces of the felt layer 10.

Here, the inorganic fibers 11 of the felt layer 10
Are compatible with a flexible binder resin (hereinafter, referred to as a binding resin) 41 and a bonding resin 42 that joins the felt layer 10 to the wood core material 20 and the wood surface layer 30. The bonding resin 41 exhibits a priming function and guides the adhesive resin 42 to the inside of the felt layer 10. As a result, as shown in FIG. 2, a bonding layer 40 spread evenly between the wooden core material 20 and the felt layer 10 is formed. Due to the joining layer 40, the felt layer 10 is integrated with the wood core material 20 and the wood surface layer 30 without generating a non-joining portion.

That is, the felt layer 10 is securely held between the wood core material 20 and the wood surface layer 30 regardless of the portion, and even if the felt layer 10 is felt between the layers between the wood core material 20 and the wood surface layer 30, Even when the layer 10 is exposed to the outside, it does not fall off as fine fiber waste. Therefore, the pillar material of the present invention can be freely cut and cut according to the space to be constructed. Further, even when the through holes are formed by nailing or the like, no fiber waste is produced.

The elasticity of the felt layer 10 depends on the inorganic fibers 1
It is adjusted by the density of 1. When a pillar material having a soft touch is required, the wooden surface layer 30 can be omitted and the surface of the felt layer 10 can be used as it is. Also in this case, since the inorganic fibers 11 are strongly bonded and joined, they are suppressed from falling off as fiber waste. Alternatively, a surface finish in which a thin synthetic resin sheet is attached to the surface of the felt layer 10 is also possible.

In the felt layer 10, the air taken in between the inorganic fibers 11 functions as a heat insulating layer, and suppresses the ignition of the wood core material 20 at the time of fire. Therefore, in the pillar material to which the wooden surface layer 30 is attached, only the wooden surface layer 30 is burned, and a large fire does not occur. Or,
The time required for the wooden core material 20 to ignite becomes longer, and the initial evacuation and fire prevention work in the event of a fire are performed safely.

The pillar material of the present invention has the following layered structure.
Since the cross-sectional area of the wood core material 20 can be reduced from the structural strength to the required minimum, the consumption of natural wood is reduced.

[0020]

The present invention will be described below in detail with reference to examples. The cross section of the wood core material 20 is 200 mm x 2
A 00 mm prism was used. In addition, a decorative plywood having a thickness of 3 mm was used as the wooden surface layer 30. Felt layer 10
As a binder, a 2.2 mm thick felt made of rock wool having a packing density of 240 kg / m ^{3 and made} of polyethylene / polypropylene-based heat-fused fibers as a binding resin was used.

A water-based polymer isocyanate-based ethylene vinyl acetate adhesive is used as an adhesive resin at 250 g / m ² as an adhesive resin on the bonding surfaces of the wooden core material 20 and the wooden surface layer 30 to the felt layer 10.
, And the felt layer 10 was interposed therebetween. Then, pressing was performed from the surfaces of the wooden core material 20 and the wooden surface layer 30 with a pressing force of 2 kgf / mm ² and held for 24 hours. Thereby, a pillar material in which the felt layer 10 was integrated with the wooden core material 20 and the wooden surface layer 30 was obtained.

In order to examine the bonding interface, the beam was cut into a rectangular plate at a pitch of 5 mm. Then, when the cut end face was visually observed, no unbonded portion was found between the felt layer 10 and the wooden core material 20 and the wooden surface layer 30.

From this, the felt layer 10 is firmly integrated with the wood core material 20 and the wood surface layer 30,
It can be seen that the rate of falling off as fine fiber waste is extremely small. Further, since the joining state of the felt layer 10 and the wood core material 20 and the wood surface layer 30 is uniform over the entire surface, even if any part of the pillar material is cut or cut, the sound insulation property, heat insulation property, fire resistance It can be seen that it can be used as a pillar with the expected functions.

[0024]

As described above, the beam and column material of the present invention is cut to a length corresponding to the construction space because the felt layer made of inorganic fibers is integrated with the wood core material in a homogeneously joined state. It is also possible to form notches for mounting and fixing floorboards and wallboards. Moreover, since the wooden core material is at the center, nailing similar to that of the conventional wooden beam and column material is possible. Since the inorganic fiber exposed on the cut end face does not fall off, the fiber is applied to the construction site while being cut or cut. In this way, according to the present invention, construction utilizing characteristics such as sound insulation, fire resistance, and heat insulation inherent in felt made of inorganic fibers can be easily performed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a beam member according to the present invention.

FIG. 2 is a cross-sectional view showing a bonding interface between a wood core material and a felt layer.

[Explanation of symbols]

Reference Signs List 10 felt made of inorganic fiber 11 inorganic fiber 20 wood core material 30 woody surface layer 40 bonding layer 41 flexible binder resin bonding inorganic fibers to each other 42 adhesive resin bonding felt to base layer

Claims (2)

(57) [Claims] An inorganic fiber felt layer attached to the surface of a wood core material, wherein the felt layer is obtained by defibrating and mixing inorganic fiber and a flexible binder resin and heating and molding. Further, a beam and pillar material excellent in fire resistance characterized in that it is bonded to the wood core material with an adhesive resin having good familiarity with a flexible binder resin. 2. A pillar material excellent in fire resistance, characterized in that a wooden surface layer is further attached to the outside of the felt layer according to claim 1.