JPS6117986B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In order to make a building assembled from precast concrete members completely fireproof, the joints of the precast concrete members must have sufficient fire resistance.

For this reason, conventional methods have been to inject mortar into the joints after assembling precast concrete members, or to fill inorganic fibers such as rock wool from the outside of the member, or to inject the inorganic fibers into the edges of precast concrete members before assembling them. The method used was to paste the

However, the method of injecting mortar lacks reliability in the mixing control and construction of fireproof mortar, and the method of filling inorganic fibers such as rock wool requires that when building a building on a full site, it is necessary to It is impossible to perform joint treatment. Furthermore, the joint material applied before the assembly of precast concrete members has the drawback that it is difficult to repair damage caused during assembly of the members, and it cannot be expected to sufficiently compensate for errors in assembly of the members.

The present invention has been proposed in order to eliminate such drawbacks, and is a fire-resistant heat insulating material that is made by layering a highly elastic heat-resistant insulating material on both sides with a heat-resistant insulating material that is wear-resistant and difficult to bend. This invention relates to a method for constructing fireproof joints for precast concrete members, which is characterized by inserting a joint material along a groove formed between joint surfaces of adjacent precast concrete members.

In the present invention, as described above, a fire-resistant joint material is produced in advance by layering a heat-resistant heat-insulating material that is wear-resistant and difficult to bend on both sides of a highly elastic heat-resistant heat-insulating material, After the precast concrete members are assembled, the joint material is inserted from one end along the groove formed between the joint surfaces of adjacent members to construct fireproof joints for the precast concrete members. , there is no need to perform construction from the outside of the precast concrete members of the exterior wall.

In addition, since the heat-resistant heat insulating material in the center, which constitutes the main body of the fire-resistant joint material, is highly elastic, the fire-resistant joint material adheres closely to the joint surface of the precast concrete member, which prevents dimensional errors in manufacturing and assembly of the same member. Errors can also be easily tracked.

Furthermore, since both sides of the highly elastic heat-resistant heat insulating material in the center of the refractory joint material are layered with wear-resistant and hard-to-bend heat-resistant insulating material, the fire-resistant joint material can be placed next to each other as described above. When the refractory joint material is inserted along the groove formed between the joint surfaces of the precast concrete member, the refractory joint material is smoothly inserted into the groove without being bent by the heat-resistant insulation materials on both outer sides, and The present invention has many advantages, such as the fact that the refractory joint material is not worn out due to friction between the joint surfaces of the members and the refractory joint material.

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

a is a refractory joint material, for example, a highly elastic heat-resistant insulation material 1 such as a trade name: Ritoflex (manufactured by Nippon Asbestos Co., Ltd.) is coated with wear-resistant material such as a trade name: Asbestos Lax (manufactured by Nippon Asbestos Co., Ltd.) on both sides. It is constructed by laminating multiple layers of hard heat-resistant heat insulating material 2 that has good properties and does not buckle. (Figures 1 and 2
(See figure) Therefore, the recesses 5, 5 are formed between the recesses 5, 5, which are formed in the vertical direction on the joint surfaces of the adjacent precast concrete outer wall slabs 4, 4, which are arranged in contact with the outer surface of the steel column 3. The refractory joint material a is inserted from the upper end along the groove 6 to form a refractory joint. (Refer to Figure 3) The fireproof joint material a should have a width not exceeding twice the width of the slot 6 at the joint joint, taking into consideration the manufacturing dimensional error of the precast concrete member and the assembly error of the same member. It is formed with a wide width and is configured to be brought into close contact with the joint surface of the member when the slot 6 is inserted. Note that if the length of the refractory joint material a is about 1 m, it can be easily inserted into the slot 6.

In the above embodiment, the grooves 6 provided in the joint surfaces of the precast concrete outer wall slabs 4, 4 are arranged so as to be in contact with the flanges of the columns 3, but as shown in FIG. It may be arranged in the middle part of the plates 4, 4 in the thickness direction. In the figure, parts equivalent to those of the above embodiment are given the same reference numerals.

Next, the results of the heating fire resistance test of the fireproof joint material will be listed.

As shown in Fig. 5, a slot B is formed at the joint of 75mm thick class 1 lightweight concrete members A and A.
Then, apply an adhesive (water-based bond 7) to both sides of asbestos trax (see above) with a depth of 40 mm and a thickness of 8 mm (see above) and a lithoflex (see above) with a depth of 40 mm and a thickness of 10 mm.
A heating fire resistance test was conducted by inserting a fireproof joint material a made of multi-layer adhesive (trade name, manufactured by Sumitomo 3M Co., Ltd.).

The test was conducted by heating for 2 hours in accordance with JISA 1304 fire resistance test method for building structures. The test results are shown in the diagram of FIG.

The temperature at point P of the steel material C on the back side of the fireproof joint material a is lower than the temperature at point Q of the steel material D on the back side of the first class lightweight concrete material a, and from this result, the fire resistance performance of the joint portion was proven to be sufficient.

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 ways without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

FIG. 1 is a slope view of a fireproof joint material, FIG. 2 is a cross-sectional plan view thereof, and FIGS. 3 and 4 are respective implementations of a fireproof joint portion of a precast concrete member constructed by the method of the present invention. A cross-sectional plan view showing an example, FIG. 5 and FIG. 6 are a cross-sectional plan view showing a heated refractory test specimen of a refractory joint portion, and a chart showing the test results, respectively. a... Fireproof joint material, 1... Heat resistant insulation material, 2...
Heat-resistant insulation material, 4... Precast concrete exterior wall version.

Claims (1)

[Claims] 1 A fire-resistant joint material made by layering heat-resistant heat-insulating material that is wear-resistant and hard to bend on both sides of highly elastic heat-resistant heat-insulating material is formed between the joint surfaces of adjacent precast concrete members. A method for constructing fireproof joints for precast concrete members, characterized by inserting them along grooves.