JPS5821049B2 - Pre-cast concrete construction - Google Patents

Description

[Detailed Description of the Invention] Conventional waterproofing methods for joints between precast concrete plates in prefabricated buildings include a method of filling soft caulking material on-site, and a method of sandwiching already molded rod-shaped waterproofing material between the plates. There were two types of methods.

The present invention relates to an improvement of the latter method.

The waterproofing material made of synthetic polymer and organic compound molded into a bar has adhesive strength, and once it adheres to the board, it does not peel off easily, so it is difficult to adjust the installation position and verticality of the board during construction. It was difficult.

In the present invention, commercially available solid adhesives made of synthetic polymers and organic compounds such as butyl rubber become inactive and lose adhesive properties at low temperatures of 0°C to -20°C, but the material remains physically and chemically stable. It was proposed based on the fact that it regains its activity and exhibits adhesive properties when the temperature returns to room temperature, and it is a synthetic polymer organic compound that becomes inactive at low temperatures and recovers its activity at room temperature. After cooling the solid adhesive, this inactive solid adhesive is inserted into the joints of the precast concrete slabs, and after construction is completed, the temperature is returned to room temperature to restore the adhesive properties of the solid adhesive. This relates to a waterproofing method for joints of precast concrete plates, which is characterized by maintaining the waterproofness of the board-cutting parts, and its purpose is to provide easy construction and waterproofing in break-up construction. An object of the present invention is to provide an improved construction method that can reliably maintain the waterproofness of a board cut-out part.

In the present invention, by utilizing the above-mentioned characteristics of the solid adhesive made of synthetic polymeric material and organic compound, the solid adhesive is cooled to temporarily lose its adhesive properties, and this low-temperature inert solid adhesive is used. Since the material is interposed between the joints of the precast concrete slabs, the adhesion strength of the solid adhesive does not work when setting the position of the slab and adjusting the verticality during erection, making it difficult to set and adjust the slab. can be carried out without any problems.

After the construction is completed, the solid adhesive returns to room temperature and exhibits adhesive properties again, thereby ensuring the waterproofness of the board-extracted portion.

The present invention will be described below with reference to the illustrated embodiments.

For example, butyl rubber adhesive (product name: Knit-Sealan)
A641) A solid adhesive 1 made of a synthetic polymer organic compound and shaped into a rod is cut into a required size of approximately 3.0 to 4.0 cm, and then this is filled with a refrigerant such as dry ice and has heat retention performance. Place in icebox, -200 to -3
Cool to 0.00.

Note that 1' in the figure is L in advance so that it can be attached to the corner of plate A.
It is a solid adhesive that is molded into a mold.

Next, the solid adhesive 1, which has been cooled and lost its adhesive properties as described above, is fitted into the concave groove 2Vc provided on the joint surface of the precast concrete plate A, and temporarily fixed to the plate A with nails 3, etc. , water is sprinkled on the surface of the low-temperature adhesive 10 to form an ice film on the surface to reduce friction and facilitate subsequent movement and sliding of the plate.

Next, the precast concrete slab A to which the adhesive 1 has been temporarily fixed is installed at a predetermined position, and the lid is finely adjusted and the verticality is adjusted to complete the work.

After construction is completed, the solid adhesive 1 returns to room temperature, recovers its adhesive properties, and provides sufficient waterproofness to the joints of the precast concrete slab A.

Although the present invention has been described above with reference to embodiments, the present invention is, of course, not limited to such embodiments, and can be modified in various designs without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional plan views showing the steps of the waterproofing method for precast concrete plate joints according to the present invention;
The figure is a front view showing the implementation situation. A... Precast concrete plate, 1... Solid adhesive, 2... Concave groove, 3... Nail.

Claims (1)

[Claims] 1. A solid adhesive made of a synthetic polymer organic compound that becomes inactive at low temperatures and recovers its activity at room temperature is cooled, and this inactive solid adhesive is inserted into the joints of precast concrete slabs. . A waterproofing method for precast concrete plate joints, characterized in that the adhesiveness of the solid adhesive that has returned to room temperature after construction is completed is restored, and the waterproofness of the board cutout part is maintained.