JPH05306554A - Synthetic fire resisting structure for curtain wall structural steel and construction method thereof - Google Patents

Abstract

PURPOSE:To enhance fire resisting performance by applying fire resisting paint to the internal surface of U-shape section which consists of a web and a flange of a steel column made of wide flange beam, mounting a fire resisting outer side plate to the outside and spraying a fire resisting material into the steel column. CONSTITUTION:A web 2a of a steel column 2 made of wide flange beam is used so that it may run in parallel to the outside of a building. Fire resisting paint 3 is applied to the internal surface of a U-shaped section formed with the web 2a and flanges 2b on both sides. Then, after the steel column 2 has been erected, a tieback material 4 is mounted with a small machine screw and a fire resisting adhesive agent between a fire resisting outer side plate 1 and the flanges 2b of the steel column 2 so that the fire resisting outer side plate 1 may be fixed. Then, after metal laths 5 have been applied to the outside of the tieback material 4, a fire resisting material 6 is sprayed to the steel column 2 from the inside of a building. A curtain wall 7 is mounted to the outside of the fire resisting outer side plate 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite refractory structure for a steel frame for a curtain wall, which has good workability such as erection and spraying work, and a construction method thereof.

[0002]

2. Description of the Related Art Main structural members such as steel columns and beams are
According to the Building Standards Law, fire resistance performance of 1 to 3 hours is required depending on the number of floors of the building, and it is necessary to provide a fireproof coating on the outer and inner sides of columns and beams. For this reason, conventionally, for the outer wall portion of the steel frame building, (1) after erection of the steel frame, a temporary scaffold is assembled on the outer side and a fireproof material is sprayed on the steel frame portion, and (2) before erection of the steel frame (3) A method of applying fireproof coating to the steel frame by internal work between the steel frame and the outer wall material after (3) constructing the steel frame and attaching the outer wall material.

[0003]

According to the above-mentioned conventional method, the work (1) requires a temporary scaffolding outside the building and the work is performed at a high place, and the work is dangerous. The joint part of the beam remains unusable, and the pre-applied fireproof coating interferes with the joint part, and it takes time to construct the steel frame. In (3), the gap between the outer wall material and the pillar or beam is small. Therefore, the workability such as spraying is poor, and it is difficult to confirm the sprayed thickness, so that the quality control for obtaining the desired fireproof coating cannot be sufficiently performed. In addition, if the outer wall material is precast concrete plate, etc., it has been certified as synthetic fireproof, and the precast concrete plate, steel column, and steel beam have the required fire resistance for the certified fireproof structure. The refractory structure has disadvantages that it is uneconomical because it is given more fire resistance than necessary.

The present invention eliminates the above-mentioned drawbacks, has good quality control, and is economical as a synthetic fireproof structure. It is not necessary to carry out a synthetic fireproof structure of a steel frame for a caten wall and an external scaffolding work, and erection and spraying work are easy. It is an object of the present invention to provide a synthetic fireproof structure for steel frames for curtain walls and a method of constructing the same, which is highly safe.

[0005]

In order to solve the above-mentioned problems, the present invention is to apply a fire-resistant coating to the inner surface of a U-shaped portion formed by a web and a flange of a steel column or beam made of H-shaped steel, A fire-resistant outer plate is attached to the outer side of the steel column, and a synthetic fire-resistant structure of steel for a curtain wall, in which a fire-resistant material is sprayed on the inside of a steel column or steel beam, and a web and a flange made of H-section steel U After erection of steel columns or steel beams coated with fireproof paint on the inner surface of the shape part,
A fireproof outer plate is attached to the outer side of the steel frame, and then a method of constructing a synthetic fireproof structure of a steel frame for a curtain wall in which a fireproof material is sprayed from the inside of a steel frame column or steel beam is taken.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a synthetic refractory structure of a steel frame for a curtain wall, which is composed of a refractory outer plate 1 and a steel column 2 of the first embodiment. The refractory outer plate 1 has a thickness of 0.5 hour fire resistance. A calcium silicate plate having a thickness of 20 mm is used, and as the steel column 2, an H-shaped steel web 2a is used so as to be parallel to the outer wall of the building, and is formed by the web 2a and the flanges 2b and 2b on both sides. 1. Inside the U-shaped part
A phosphoric acid-based refractory paint 3 having a thickness of 1 mm and having fireproof performance for 5 hours is applied. A fastening member 4 is attached between the fire-resistant outer plate 1 and the flange 2b of the steel column 2 with a fire-resistant adhesive and a screw to fix the fire-resistant outer plate 1, and a metal lath 5 such as a rib lath is fixed to the outside thereof. The fireproof material 6 such as rock wool is sprayed to the thickness of 50 mm from the inside of the building on the steel column 2 of the shaped steel and the metal lath 5 portion such as the rib lath.
A curtain wall 7 such as a concrete panel or a metal panel is attached to the outside of the fireproof outer plate 1.

As mentioned above, the outer side has a combined fire resistance of 2 hours due to the 0.5 hour fire resistance of the fire resistant outer plate 1 and the fire resistance of the fire resistant paint 3 equivalent to 1.5 hours, and the inner side has the same fire resistance of 2 hours. It has the property of time fire resistance. Note that the fire-resistant outer plate 1
In addition to the calcium silicate plate, it is possible to use a fiber-containing calcium silicate plate having an appropriate thickness and having a fire resistance of 0.5 hour to 1 hour. In addition, paints such as vinyl chloride-based, epoxy-based, and melamine-based paints having an appropriate thickness can be used so as to have performance equivalent to fire resistance for 1 to 2 hours. Further, as the sprayed refractory material, rock wool, ceramic wool or the like can be used with an appropriate thickness so as to have fire resistance performance for 2 to 3 hours.

FIG. 2 shows a composite refractory structure of a steel frame for a curtain wall, which is composed of a fire-resistant outer plate 8 and a steel beam 9 of the second embodiment. The fire-resistant outer plate 8 is the same as that of the first embodiment. A calcium acid plate is used, and an H-shaped steel web 9a is used as the steel beam 9 so as to be parallel to the outer wall of the building, and the inner surface of the U-shaped portion formed by the web 9a and the flanges 9b and 9b on both sides. The phosphoric acid-based refractory paint 10 similar to that of the first embodiment is applied to. A precast concrete plate or a cast-in-place concrete slab 11 is provided on the upper flange 9b of the steel beam 9, and the fire-resistant outer plate 8 and the upper and lower surfaces of the ends of the concrete slab 11 and the fire-resistant outer plate 8 and the steel beam 9 are provided. Between the flange 9b of the
2 is attached with a fire-resistant adhesive and a screw to fix the fire-resistant outer plate 8, and a metal lath 13 such as a rib lath is fixed to the outer side thereof, and between the end of the concrete slab 11 and the fire-resistant outer plate 8. After filling the gap blocking material 14 such as rock wool, H
Similar to the first embodiment, a refractory material 15 such as rock wool is sprayed onto the steel beam 9 of shaped steel, the concrete slab 11 above it, and the metal lath 13 below.

Since the procedure for constructing the composite refractory structures for the steel frames for curtain walls of the first and second embodiments is almost the same, the first embodiment will be explained. After erection of the steel pillar 2 in which the fire-resistant paint 3 having a performance equivalent to 1.5 hours fire resistance is applied to the inner surface of the U-shaped portion formed by the flanges 2b and 2b on both sides, the fire-resistant outer plate 1 The fireproof outer plate 1 having a 0.5-hour fireproof performance such as a calcium silicate plate is attached by attaching the fastening material 4 between the steel column 2 and the steel column 2 with a fireproof adhesive and screws. After applying metal lath 5 to the outside of 4, the steel pillar 2 from the inside of the building
Refractory materials such as rock wool that have fireproof performance for 2 hours 6
Is what is blown.

[0010]

According to the invention of claim 1, since the fireproof coating is applied to the inner surface of the open U-shaped portion of the H-section steel, a fireproof coating having a thickness of the fireproof coating as specified can be obtained. The fireproof outer plate and the steel column or steel beam do not need to have the fire resistance required for the certified fireproof structure independently, and the fireproof outer plate is sufficient to satisfy about 1/4 of the fireproof time of the certified fireproof. A thin structure provides a defined composite structure. In addition, the fire-resistant outer plate serves as a flame shield and heat insulating material, and the fire-resistant paint is not directly exposed to the flame, and a stable heat-insulating layer of the fire-resistant paint can be obtained to improve the fire resistance performance. The structure is obtained.

According to the second aspect of the present invention, since it is not necessary to provide a temporary scaffold outside the building, there is no danger of work, and U of H-section steel is used.
Since the fireproof paint is applied in the factory or on the ground with the shape open, the thickness of the fireproof paint can be applied uniformly, so that quality control can be sufficiently performed to obtain a certified fireproof coating. Since fire-resistant paint is applied on the ground, it is not necessary to work from a narrow gap, and work is easy,
In addition, a fireproof structure with stable quality can be obtained. Furthermore, since the inner side of the steel column or steel beam is sprayed with refractory material after building, it is necessary to perform a bad work due to the failure of the joint between the column and the beam, as in the case where fireproof coating is applied before building. There are no advantages.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view of a steel column portion showing a first embodiment of the present invention.

FIG. 2 is a vertical sectional front view of a steel beam portion showing a second embodiment of the present invention.

[Explanation of symbols]

 1 Fireproof outer plate 2 Steel column 2a Web 2b Flange 3 Fireproof paint 6 Fireproof material 9 Steel beam 9a Web 9b Flange 10 Fireproof paint 15 Fireproof material

Front page continuation (72) Hideo Sato Inventor Hideo Sato 2-5-14 Minamisuna, Koto-ku, Tokyo Inside the Takenaka Corporation Technical Research Institute (72) Inventor Yukoma Ishida 8-2-1 Ginza, Chuo-ku, Tokyo Stocks Takenaka Corporation Tokyo Main Store (72) Inventor Masato Nakamura 8-21-1, Ginza, Chuo-ku, Tokyo Stock Company Takenaka Corporation Tokyo Main Store

Claims (2)

[Claims] 1. A web (2a), (9a) and a flange (2) of a steel column (2) or a steel beam (9) made of H-shaped steel.
b), fireproof paint (3) is applied to the inner surface of the U-shaped portion formed by (9b), and the fireproof outer plate (1) is attached to the outside thereof, and the steel column (2) or steel beam A synthetic fire-resistant structure of steel frames for curtain walls, in which the fire-resistant materials (6) and (15) are sprayed inside (9). 2. A steel column (2) having a fire-resistant coating (3) applied to the inner surface of a U-shaped portion formed of H-section steel webs (2a), (9a) and flanges (2b), (9b), or After erection of the steel beam (9), the fire-resistant outer plate (1) is attached to the outer side, and then the fire-resistant material (6), (15) from the inside of the steel column (2) or the steel beam (9). ) Spraying method of steel frame synthetic fireproof structure for curtain wall.