JPH0621515B2 - Wall finishing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a wall surface finishing method in a concrete surface direct tensioning method in which a gypsum board is attached to a concrete skeleton via a dango-like adhesive.

2. Description of the Related Art A concrete surface straightening method is widely used in which an adhesive is applied in a dango-like manner to a concrete skeleton made of concrete, a concrete block, an ALC plate or the like, and a gypsum board is pressure-bonded thereto to form a wall foundation.

The wall foundation formed by such a construction method is filled with putty in the gaps of the plasterboard butt portion, and the jointing tape is glued to the side edge of the adjacent plasterboard to fix the unevenness of the wall surface and then the topcoat material. Makeup is done by trowel coating or spray coating.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, according to the wall structure of such a concrete surface direct laying method, the part except the side edges of the gypsum board is integrated with the concrete skeleton by the dango-like adhesive, and the gypsum board Since there is no adhesive between the side edges of the concrete structure and the concrete skeleton, vibration and other external force of the ventilation device applied to the concrete skeleton causes deformation at the butt part of the gypsum board, causing cracks in the top coating wall. It was

Means for Solving the Problems As a result of performing various tests in view of such circumstances, the present inventors have attached a gypsum board to a concrete skeleton via a dango-shaped adhesive, and abutted portions of adjacent gypsum boards. A small hole is bored in the small hole, and the unfoamed urethane composed of the polyol component and the isocyanate component is injected into the small hole while being mixed, and the urethane foam resin is solidified between the concrete frame and the gypsum board, and the butt part of the gypsum board is solidified. The inventors have found that the occurrence of cracks in the top-coat wall can be suppressed for a long period of time by coating the top-coat material on the surface of the gypsum board after fixing the unevenness in No. 2 and completed the present invention.

As a result of further studies, the plaster board was adhered to the concrete frame with a dangling adhesive, and the surface of the wall was made up with an overcoat material. A small hole is bored in the small hole, and the unfoamed urethane composed of the polyol component and the isocyanate component is injected into the small hole while being mixed, and the urethane foam resin is solidified between the concrete frame and the gypsum board, and the butt part of the gypsum board is solidified. After fixing the unevenness in
It has been found that by applying an overcoating material to the wall surface, the already cracked wall surface can be repaired and the recurrence of cracks can be prevented.

In carrying out the present invention, a dango-like adhesive such as gypsum-synthetic resin adhesive is applied to the concrete skeleton in an amount of 150 to 250.
Apply at a rate of about 3 to 4.5 kg per 1 m ² at an interval of mm, press the gypsum board on the surface to form a wall finishing surface, and foam urethane at the abutment of the adjacent gypsum board at an interval of 25 to 35 cm. Drill a small hole that matches the nozzle of the injection machine, insert a nozzle that ejects while mixing the polyol component and the isocyanate component of the unfoamed urethane until the diameter of the urethane foam resin becomes about 50 to 300 mm. Inject urethane resin to foam and harden it, then put putty in the gap of the gypsum board and remove the overflowing urethane resin, and glue the jointing tape on it, and, if necessary, on the surface of the jointing tape and gypsum board. Apply the undercoat material with a thickness of a few millimeters to adjust the unevenness of the wall surface and the drainage of the wall foundation, and then trowel or paint the topcoat material such as Juraku wall, sand wall, fiber wall and various spray walls. It can be spray painted.

Incidentally, the urethane resin suitable for carrying out the present invention should be appropriately changed depending on the strength of the gypsum board and the strength of the adhesive to the concrete skeleton, but when using a gypsum-based adhesive, it is soft or semi-hard. Suitable for

According to the present invention, a small hole is made in the abutting portion of the gypsum board that is adhered to the concrete body via the dango-like adhesive, and urethane foam is injected from this small hole to inject the concrete body and the side end portion of the gypsum board. Since the urethane foam resin is filled between the two, the urethane foam resin always presses the side edges of the gypsum board elastically, and even if some vibration occurs in the concrete frame, the urethane foam resin will move these movements. Absorbing and no rocking at the butt part of the gypsum board,
The top coating material does not crack at the buttocks of the gypsum board.

Example 1 A plaster-synthetic resin adhesive (trade name "Tiger GL Bond", made by Yoshino Gypsum) was kneaded with water to form a dango-like adhesive, which was applied to a wall made of a reinforced concrete skeleton for about 200 times.
Apply at a height of 4 to 5 cm at intervals of 9 mm and apply pressure 9 to the surface.
Crimp a mm plaster board, 10 ~ between the wall and plaster board
The wall surface was formed by leaving a gap of 15 mm.

Next, a plurality of small holes with a diameter of 8 mm were made at intervals of about 30 cm in the abutting part of the adjacent gypsum board, and a urethane foam injection machine [trade name "Peach Pack A", Nisshinbo Industries Inc.
Manufactured), spouted while mixing the polyol component and the isocyanate component of the unfoamed urethane, injected the urethane foam resin until the diameter became 100 to 200 mm, hardened, and then overflowed from the gypsum board. Remove the urethane foam resin and fill the space between the gypsum boards with acrylic resin putty and glue a glass cloth tape with a width of 50 mm on it. The undercoat material consisting of fiber, calcium carbonate and emulsion resin is trowel coated, and the dry wall surface is trowel coated with an overcoat material consisting of sand, colored soil, powder pulp and CMC,
It naturally dried to form a Juraku wall.

The top coating wall in the gypsum board butt portion of the reinforced concrete body did not crack at all even after 5 months from the trowel coating.

On the other hand, in a comparative test in which the abutting portion of the gypsum board was not filled with the urethane foam resin, cracks occurred in the abutting portion of the gypsum board simultaneously with the drying of the overcoat material.

Example 2 A gypsum board was pressure-bonded to a skeleton made of an ALC plate via a dango-like adhesive, a putty was put in the butted portion, a joint tape was glued, and wood powder, an inorganic filler, CM were applied to the surface.
Top coat material consisting of C, pigment, etc. is troweled and dried, and on the wall surface where the abutting part of the gypsum board is cracked, multiple small holes with a diameter of 8 mm are arranged at intervals of about 30 cm in the abutting part of the gypsum board where the crack is occurring The individual pieces are perforated, and the urethane foam resin is injected and cured in the small holes in the same manner as in Example 1, and then the existing wall coating film and joint fixing tape at the gypsum board butting portion are removed, and acrylic resin is applied to the gaps of the gypsum board. The system putty was filled, and the same treatment as in the above-mentioned examples was performed below, and wood powder, inorganic filler, CMC,
An overcoat material composed of a pigment or the like was troweled and dried.

The repaired wall surface was free from cracks even after 4 months from the trowel coating.

EFFECTS OF THE INVENTION According to the present invention, since no crack occurs in the top coating material on the wall formed by the method for directly laying the concrete surface of the gypsum board, it is possible to make a beautiful surface makeup finish on this kind of wall surface, such as a smooth wall or a sand wall. .

Claims (2)

[Claims] 1. A gypsum board is adhered to a concrete skeleton via a dango-like adhesive, small holes are formed in the abutting portions of adjacent gypsum boards, and the small holes are made of a polyol component and an isocyanate component and are not foamed. Characterized by injecting urethane while mixing it, solidifying the urethane foam resin between the concrete skeleton and the gypsum board, fixing the unevenness at the buttocks of the gypsum board, and then painting the surface of the gypsum board with the top coat material. Wall finishing method. 2. In a wall surface in which a gypsum board is adhered to a concrete skeleton via a dango-like adhesive, and the surface of the gypsum board is finished with a top coat material, a small hole is formed in the abutting portion of the gypsum board in which the wall coating film is cracked. And inject into the small holes while mixing unfoamed urethane consisting of polyol component and isocyanate component, solidify the urethane foam resin between the concrete skeleton and the gypsum board, and make sure that the butt part of the gypsum board has no unevenness. After finishing, the wall surface finishing method is characterized by coating the surface of the wall with a top coat material.