JPH03176566A - Method of covering with refractory material - Google Patents

Abstract

PURPOSE:To facilitate a work to perform covering with a refractory material by a method wherein forms are installed as a filling space is previously formed around a steel frame, and after the forms are filled with a fluid refractory material and cured, the formed are divided for removal. CONSTITUTION:Forms 16 are formed around a steel frame, e.g. a H-steel 12, as a filling space is formed between the forms and the frame, and the forms 16 are filled with a fluid refractory material 26, which is cured. After the refrac tory material 26 is cured, the forms 16 are divided for removable. The forms 16 are formed such that division of the forms 16 is prevented from being imped ed by the cured refractory material 26 in a way that after complete separation, division is effected or a hinge part 18 is mounted and the forms are brought into a half-division state for division. This method executes a work without being influenced by the shape of the steel frame and production of powder dust.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for coating a steel frame of a structure with a fireproof material.

[Conventional technology]

In structures using steel frames such as H-beams, fireproofing material may be installed around the steel frames. In this case, a method is adopted in which a refractory material such as rock wool is attached by spraying, or a method in which a refractory material previously formed into a panel shape is fixed to the outer periphery of the steel frame.

When using fire-resistant panel materials, it is necessary to prepare fire-resistant panel materials of various shapes depending on the shape of the steel structure.
Manufacturing becomes complicated. On the other hand, the spraying method is easy to construct because it is not affected by the shape of the steel frame.

However, the spraying method generates a significant amount of dust during the work, and the work environment is poor as the dust is scattered around the site where the spraying is being carried out, and other work cannot be carried out at the same time.

[Problem to be solved by the invention]

The present invention takes the above-mentioned facts into account, and aims to provide a method for covering fireproof materials that is not affected by the shape of steel structural members and eliminates the generation of dust.

[Means to solve the problem]

The present invention is characterized in that a divisible formwork is fixed around a steel frame structural member, and after the formwork is filled with a fluid refractory material and solidified, the formwork is removed.

For this reason, in the present invention, a formwork is installed in advance around the steel frame structural member while forming a filling space between the formwork and the structural member. Here, the inside of the formwork is filled with a fluid refractory material and allowed to solidify. The filled refractory material may be in the form of granules, powder, etc., as long as it has fluidity; for example, it may be in the form of a low-viscosity rock wool mortar. A filter can be provided in the formwork corresponding to the bottom of the refractory material to remove excess water drained from the mortar.

After the filled refractory material has solidified, the formwork is divided and removed.

It is desirable that the shape of this formwork is such that the dividing operation is not hindered by the solidified refractory material at the time of division, and it is not limited to the case where the formwork is completely separated and divided, but it should also be possible to divide it in half with a hinge structure. Good too.

〔Example〕

FIG. 1 shows a longitudinal sectional view of a structure to which the present invention is applied. In this example, H-beam 12 is used as the steel structure material.
beams are used. A slab 14 is placed above the H-beam 12.

A formwork 16 is installed around the H-beam 12. This formwork 16 is composed of mutually symmetrical small frames 1611162, and can be divided by relative rotation around a hinge part 18 arranged below the H-section steel 12. The bottom portion 16A extending horizontally from the hinge portion 18 is H-shaped.
It is parallel to the lower flange portion 12A of the bottom portion 16A, and a vertical portion 16B extends from the tip of the bottom portion 16A.

From the upper end of this vertical portion 16B, there is a concave portion 1 having a U-shaped cross section.
6C are continuous, and the central vertical part has a shape along the upper web 12B of the H-shaped wJ12. Also, this recess 16
A vertical portion 16D is formed at the upper end of C and is disposed on both sides of the upper flange portion 12C of the H-shaped steel 12.
The upper end portion is a horizontal portion 16E, which is temporarily fixed to the slab 14 with a fixing member 22 such as a nail or bolt.

A filter 24 is arranged at the bottom 16A. This filter 24 is made of a porous material, and has legs 2
4A spaced apart the filter 24 from the bottom 16A. This filter 24 allows excess water flowing out of the refractory material 26 to pass therethrough, and allows the excess water to flow out through a drain hole 28 formed in a portion of the bottom portion 16A.

Note that an injection port 32 is previously formed in the slab 14 to serve as a filling hole for the refractory material 26, and by forming a plurality of injection ports 32, any one of the injection ports 32 can be used for venting air.

Next, the construction procedure of this embodiment will be explained.

After installing the filter 24 on the bottom 16A of the formwork 16 in advance, the formwork 16 is attached around the H-section steel 12. In this case, the horizontal portion 16E of the H-shaped steel 12 is temporarily fixed to the bottom surface of the slab 14 using the fixing member 22.

Here, the fluid refractory material 26 is filled from the injection port 32. Excess water of the refractory material 26 passes through the filter 24 and is discharged from the drain hole 28. Further, after the refractory material 26 has solidified, the stopper member 22 is removed from the slab 14 and the small frame 16 is removed.
1.162 is relatively rotated around the hinge portion 18 to separate it and remove it from the H-beam 12. In this case, it is necessary to consider the shape of the slope in the recess 16C of the formwork 16 so that the removal work of the small frames 161 and 162, which are divided and opened at the hinge part 18, is not obstructed by the solidified refractory material 26. That is, when the small frame 1-61, 162 is pivoted about the hinge 18 from the state shown in FIG. 1, any part of the small frame is prevented from interfering with the solidified refractory material 26.

This formwork 16 has a length of 900 m in the direction perpendicular to the paper surface in Fig. 1.
It is preferable to use units of 1,200 mm, 1,800 mm, etc., and to provide flanges at the ends of these units in the longitudinal direction to connect them to each other. It is preferable that the injection ports 32 have a diameter of 25 to 30 mm and are provided at intervals of about 450 mm.

Next, FIG. 2 shows a second embodiment of the present invention. In this embodiment, the formwork 16 in the previous embodiment is not made of metal but is made of synthetic resin, particularly FRP (fiber reinforced synthetic resin). In this case, the shape of the formwork 16 can be not only linear but also curved or spherical, which widens the range of design choices.

Although the above-mentioned embodiment shows a configuration in which the formwork 16 can be divided by a hinge structure, the formwork is not limited to the hinge structure, and the formwork may be completely separated and removed. Further, if necessary, windows for passage of a vibrator or the like to be embedded in a building can be formed in these formworks.

〔Effect of the invention〕

Since the present invention has the above structure, it has an excellent effect of being able to provide a fireproof material coating method that is not affected by the shape of the steel structural material and does not generate dust during construction.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a structure to which the present invention is applied, and FIG. 2 is a vertical cross-sectional view showing a structure to which a second embodiment of the present invention is applied. 12...H-shaped steel 16...Formwork, 161.162...Small frame, 16A...Bottom, 16B...Vertical part, 16C, 16D, 16E, 18...26...Concave part , ・Vertical section, ・Horizontal section, ・Hinge section, ・Refractory material.

Claims (2)

[Claims] (1) A method for covering a fireproof material, which comprises fixing a divisible formwork around a steel frame structural member, filling and solidifying a fluid refractory material into the formwork, and then removing the formwork. (2) The refractory material coating method according to claim 1, wherein the formwork is provided with a filter corresponding to the bottom of the refractory material to be filled, for removing excess water from the refractory material.