JPH05331959A - Wood-concrete composite material - Google Patents

Abstract

PURPOSE:To obtain a composite material for columns, having excellent texture peculiar to wood and high strength as the base material by forming wood layers on four sides of a concrete base material. CONSTITUTION:In a wood-concrete composite material 1 as a column part, thin wooden plates 3 are laminated by high-pressure bonding on four sides of a concrete base material 2 of an almost square cross section. The base material 2 is composed of carbon short fibre-reinforced concrete 4, in which FRP reinforcing bars 5 having connected carbon fibre filaments as cores are arranged in the lengthwise direction on the outer edge sides. Or, in the composite material 1 as beam part, the thin plates 3 are laminated on four sides of the concrete base 2 composed of the fibre-reinforced concrete 4 and the reinforcing bars 5 are arranged in the lengthwise direction on the short outer edge sides. The composite material can have excellent properties as compressive strength and elasticity modulus as the base material and good texture peculiar to wood.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood / concrete composite material in which a wood layer is laminated on the surface of a base material of concrete and used as a building material for civil engineering, buildings and the like.

[0002]

2. Description of the Related Art There has been a technique for using wood as a structural material or interior / exterior material as it is since ancient times. In addition, a technique of attaching wood as a finishing material to the surface of steel frames and concrete is also being implemented.

However, a building material manufactured by integrating wood, steel frame and concrete is rarely used as a structural material or a finishing material, and it is not possible to easily cut or nail the integrated building material. There is a cause.

[0004]

[Problems to be Solved by the Invention] In Japan, wood-based building materials are building materials that are indispensable in terms of history and culture, but in recent years, protection of the global environment has been recognized and the depletion of natural resources is prevented. The need has arisen. In particular, natural wood has a long production cycle and is a representative resource for depletion of natural resources.

The present invention has been made in view of the above circumstances. The purpose is to propose a wood-concrete composite material that has a feel and workability similar to those of conventional wood-based building materials, and that uses a small percentage of wood.

[0006]

According to a first aspect of the present invention, there is provided a wood-concrete composite material in which a wood layer is laminated on the surface of a concrete base material, and the base material is fiber reinforced concrete mixed with short fibers. Characterize. A second aspect of the present invention is the composite material according to the first aspect, wherein the fiber-reinforced concrete is made of lightweight aggregate.

The short fibers used in the present invention are selected from fibers having high tensile strength and high tensile modulus such as carbon fibers, aromatic polyamide fibers (aramid fibers), vinylon fibers or alkali resistant glass fibers. These fibers are made into short fibers with a fiber length of several mm to several cm and mixed into a cement / aggregate mixture slurry to form fiber-reinforced concrete.

As the lightweight aggregate used in the present invention, glassy foams such as shirasu balloon and obsidian foam granules are preferably used.

This composite material is provided with continuous yarns of the above-mentioned fibers, or reinforcing bars of FRP (fiber reinforced plastic) having these yarns as a core material, and further prestressing these reinforcing bars. Can be introduced and reinforced.

[0010]

[Function] In this wood-concrete composite material, the fiber-reinforced concrete as the base material has high strength, has excellent durability without corrosion, and has a wood layer laminated on its surface,
It demonstrates the texture of natural wood and the excellent physical properties of the base material such as high strength and durability.

The fiber-reinforced concrete using the lightweight aggregate as the base material of the composite material according to claim 2 generally has a specific gravity of 1.0 to 1.
It is as light as 6 and has high bending strength.
In addition, it has excellent workability such as saw cutting and nailing. On the other hand, the wood laminated on the surface layer has a specific gravity of less than 1.0, is excellent in workability, has the same compressive strength and elastic modulus in the direction of the wood fiber axis as the fiber-reinforced concrete as the base material, and has a higher tensile strength than the fiber-reinforced concrete. Therefore, the wood-concrete composite material further exhibits physical properties, workability and texture similar to wood.

[0012]

EXAMPLE The example of FIG. 1 is a wood-concrete composite material 1 used as a pillar member, in which a thin wood plate 3 is laminated under high pressure on four sides of a concrete base material 2 having a substantially square cross section. The base material 2 is made of fiber reinforced concrete 4 in which short carbon fibers are mixed, and FRP reinforcing bars 5 having a connecting yarn of carbon fibers as a core material are arranged along the lengthwise direction on the outer edge side. It should be noted that prestress can be introduced into the reinforcing bar 5.

The embodiment shown in FIG. 2 is a composite material 1 used as a beam member, in which a thin wood plate 3 is laminated on four sides of a concrete base material 2 made of fiber reinforced concrete 4 and having a rectangular cross section.
FRP reinforcements 5 are arranged along the length direction on the outer edge side of the short side.

The embodiment shown in FIG. 3 is a composite plate 1 used as a panel member, and a thin wood plate 3 is laminated on two surfaces of a plate-shaped concrete base material 2 formed by extrusion molding.
The base material 2 is made of fiber reinforced concrete 4, and has a hollow portion 6 having a rectangular cross section along the length direction (extrusion direction).
Although not shown, FRP reinforcing bars may be arranged. Further, the wood thin plate 3 may be laminated only on one surface.

The embodiment shown in FIG. 4 is a composite material 1 used as a wall material or floor material having a relatively large external force. The concrete base material 2 is plate-shaped and is made of fiber reinforced concrete 4. -Shaped ribs 7 along the central and central parts
The wood planks 8 are adhesively laminated on the ribs 7. FRP reinforcing bars 5 are arranged in a lattice on the base material 2, and FRP tension members 9 are arranged along the length direction on the lower surface side of the rib 7 to introduce prestress. A heat insulating material 10 is packed in the recess between the ribs 7, 7.

In the above embodiments, although the aggregate is not described, in addition to the usual aggregate such as sand and crushed stone, lightweight aggregate such as shirasu balloon and obsidian foam granules is used according to the purpose of use.

[0017]

The present invention is as described above, and this wood-concrete composite material can reduce the amount of wood used, and has excellent texture and workability of wood, and at the same time has high strength and durability. , It can exhibit characteristics such as fire resistance.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a wood / concrete composite material used as a pillar member.

FIG. 2 is a cross-sectional view of a wood / concrete composite material used as a beam member.

FIG. 3 is a cross-sectional view of a wood / concrete composite material used as a panel member.

FIG. 4 is a cross-sectional view of a wood / concrete composite material used as a floor material or the like.

[Explanation of symbols]

1 ... Wood / concrete composite material, 2 ... Concrete base material, 3 ... Wood thin plate, 4 ... Fiber reinforced concrete, 5 ... F
RP reinforcement, 6 ... Hollow part, 7 ... Beam type rib, 8 ... Wood plank, 9 ... FRP tension material, 10 ... Thermal insulation material.

Claims (2)

[Claims] 1. A wood / concrete composite material in which a wood layer is laminated on the surface of a concrete base material, wherein the base material is fiber reinforced concrete mixed with short fibers. 2. The wood-concrete composite material according to claim 1, wherein the fiber-reinforced concrete is a lightweight aggregate.