JPS6233860Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a composite board for floors. Conventionally, wood-based cement boards have a remarkable heat insulating effect and moisture control function of absorbing and releasing moisture, and can prevent tatami mats from rotting even in concrete buildings, and also have properties that allow wood-based cement boards and mortar to blend well. Combined with the elasticity of the wood-based cement board, it is extremely effective in preventing impact noise on the floor from being transmitted downstairs, and it is easy to install.
Demand for tatami subflooring has increased rapidly in recent years due to its economic efficiency. However, on the other hand, the conventional method of using wood-based cement boards for tatami subfloors is to place blocks of mortar on top of a concrete slab in places and then lay wood-based cement boards on top of it. In this case, if there is a period of one month or more between laying the wood cement boards and putting them in, the bottom side of the wood cement boards (the side that comes into contact with the concrete) will absorb moisture from the mortar and expand. However, as the upper surface dries and shrinks, it warps upwards toward both ends and loses its function as a flooring material.Also, since the surface of wood-based cement boards is rough, small particles of dust accumulate and become unclean. Moreover, it was inconvenient to clean, and there were many accidents caused by workers stepping on it when walking on it during tatami-folding work, etc. Also, because the surface was rough, it had the disadvantage that it could not be used for floors in Western-style rooms. On the other hand, when constructing a floor in a Western-style room, one example of the conventional construction method is to install floor blocks (anchors made of iron plates at both ends of a wooden flooring material) while pouring hardened mortar on the concrete floor. Although this method has the advantage of being smooth and beautiful and can be installed immediately, its disadvantage is that the mortar underneath can be removed through the asphalt prevention layer on the underside of the wooden flooring. Wood absorbs moisture and expands, causing a heave-up phenomenon.Furthermore, since it does not absorb floor impact noise, the impact noise generated on the floor is directly transmitted to the upper floor, resulting in poor insulation performance. It has drawbacks such as easy condensation on the surface. The present invention has been devised for the purpose of providing a composite floor board that eliminates these drawbacks. Referring to the drawings showing an example of the embodiment, 1 is a wood-based cement board, and 3 is a veneer plywood adhered to the surface of the wood-based cement board 1. 2 is a waterproof layer interposed between the plywood veneer and the wood cement board 1. Reference numerals 4 and 4 designate grooves cut parallel to the lower surface of the wood-based cement board 1 at regular intervals in a direction perpendicular to the longitudinal direction from the lower surface of the wood-based cement board 1 toward the veneer plywood 3 on the upper surface. Since the present invention has such a configuration, to give an example of the test results, a wood fiber cement board was adopted as the wood cement board 1, and its size was (length x width x thickness = 600 m/m x 900 m/ m x 30 m/m), and a plywood board with the same surface area and a thickness of 12 m/m is pasted on the top surface to test the degree of warping. In this case, the expansion of the plywood due to moisture absorption is greater, so If you leave the plywood indoors with the plywood facing up, it will warp into an inverted U shape, and the center part will be approximately 20m/20ft from the level surfaces at both ends.
It was confirmed that the increase in Next, as in the present invention, there are two
After making the grooves at these locations, it was confirmed that the upward warpage at the center was approximately 2 m/m, equivalent to 1/10 of the amount of warpage. That is, by providing the cut grooves, the cut grooves absorb the difference in the amount of expansion between the wood fiber board and the veneer plywood, and a flat surface without warping can be maintained. In addition, when installed as a flooring material, the wood fiber board absorbs the moisture of the mortar placed on the concrete slab and expands, resulting in a 2 m/2 m area in the center.
The warpage of m is corrected (the original warp of the composite board and the warp to the opposite side due to the expansion of the mortar wood fiber board are balanced), and a horizontal floor can be constructed.
The surface of this product is made of veneer plywood, so it is easy to clean, has great strength, and is 3/5th the weight of the conventional product, making it easy to handle and workable. The ability to absorb floor impact sound, which is of great interest as a material, is truly excellent, and the test results at the Japan Building Research Institute are shown in the table below. Test conditions Concrete floor thickness 150m/m Overcoat mortar thickness 50m/m Product thickness 40m/m Felt thickness 12m/m Carpet thickness 11m/m

[Table] In addition, in the case of the product of this invention, all the moisture in the mortar is absorbed by the wood fiber boards, and the plywood on the top surface separated by the waterproof layer is not affected by moisture, and the veneer plywood expands and the soldering phenomenon occurs. This invention has the effect that it can be used not only for the tatami subfloor of Japanese-style rooms, but also for Western-style rooms. In addition, as a test product of the present invention, good results were obtained by using a wood fiber cement board as the wood cement board 1, but instead of the wood fiber cement board, wood wool cement board, wood chip cement board, wood wool magnesia board, etc. were used. Of course, almost the same effect can be obtained even if it is used.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of the implementation of the present invention. FIG. 2 is a longitudinal sectional view. 1...Wood-based cement board, 2...Waterproof layer, 3...
...Plywood plywood, 4... Cut grooves.

Claims (1)

[Scope of utility model registration request] A veneer plywood 3 is pasted on the surface of the wood-based cement board 1 via a waterproof layer 2, and the wood-based cement board 1
This composite board for flooring is formed by cutting grooves 4, 4 parallel to each other from the bottom side of the wood-based cement board 1 to the veneer plywood 3 side on the top side at regular intervals in the longitudinal direction and the right angle direction on the bottom side.