JP2002180569A - Steel frame fire resistive covering method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel frame fire resistive covering method capable of thinning fireproof gypsum boards covering steel framed columns to reduce a cost by controlling an amount of heat flowing into the steel framed columns from a fire heating side to control a temperature rising of the steel framed columns. SOLUTION: For the steel frame fire resistive covering method for making fire resistive covering of the outside surfaces of the steel framed columns 10 with reinforced fireproof gypsum boards 13 through spacer and fireproof board mounting steel-made substrate materials 11 and 16, the same kind of fireproof boards 17 and 18 as that of the covering fireproof boards 13 are lined to the steel-made substrate materials 11 and 16 on the column side to form them into heat insulating substrate materials, the heat insulating substrate materials are mounted on the circumferences of the steel framed columns 10 at a predetermined interval in the circumferential direction, and the fireproof boards 13 are mounted on the outside surfaces of the substrate materials to make fire resistive covering of the steel framed columns 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for refractory coating a steel column of a steel building.

[0002]

2. Description of the Related Art Steel fire-resistant coating is a typical measure for protecting a steel building from fire. By applying a fire-resistant coating to a steel member, the temperature rise of the steel member during a fire is limited to a certain allowable value. It plays a role in reducing the effect of proof stress and thermal expansion. The fireproof structure of the steel column is required to have fireproof performance for each structure, part, and floor of the building.

Next, a description will be given of a conventional fire-resistant coating method used for a steel building. FIG. 6 shows a fire-resistant coating structure by a spraying rock wool method. A refractory material 2 such as rock wool is applied to the outer surface of a steel pipe column 1 by spraying and dried, and a steel base material 3 is applied to the outer surface. A fireproof coating is performed by attaching a gypsum board, a fiber reinforced cement board, or the like 4 through the intermediary.

FIG. 7 shows a refractory coating structure by a calcium silicate plate sticking method. A refractory coating is performed by attaching a calcium silicate plate 6 to the outer surface of a steel pipe column 5 via a spacer 5a. FIG. 8 shows a fireproof coating structure by a reinforced gypsum board sticking method, in which a fireproof coating is performed by attaching a reinforced gypsum board 9 to the outer surface of a steel pipe column 7 via a steel base material 8.

Further, Japanese Patent Application Laid-Open Nos. 8-68129 and 8-
As described in U.S. Pat. No. 68130, there is known a fire-resistant coating structure in which an iron plate material is disposed between a lower coating material and an upper coating material that directly cover a steel pipe column so as to cover the entire circumference of the lower coating material. Have been.

[0006] Further, Japanese Patent No. 2691287 discloses that a plurality of steel base materials made of angle irons are attached to the outer periphery of a concrete-filled steel pipe column in the column direction, and are arranged in parallel at required intervals as the base material. Then, it is attached and attached with an adhesive material interposed in the thick layer according to a predetermined standard, and it is bound and fixed with a steel base fastening material at required places, and these steel base materials and steel base fastenings are fixed. A fire-resistant board is attached to the outside of the material, and the fire-resistant board is fixed to a steel base material with a tapping screw, and a steel base material and an adhesive are used as a spacing material between the concrete-filled steel pipe column and the fire-resistant board. A refractory structure with a space to be formed is described.

[0007]

Problems to be solved by the conventional method shown in FIGS. 6 and 7 are apparent from comparison with the present invention described later, and will not be described here. The fire-resistant coating structures described in JP-A-8-68129 and JP-A-8-68130 are costly because they have a structure in which the fireproof performance is ensured by two covering materials, an upper lining and a lower lining. The fireproof structure described in Japanese Patent No. 2691287 is insufficient in fireproof performance because no measures are taken to improve the heat insulation of the steel base material.

The present invention provides a board for fire-resistant coating by backing a fire-resistant board to a steel base material, thereby suppressing the amount of heat flowing into the steel pillar from the fire heating side and suppressing the temperature rise of the steel pillar. Reduce the cost and shorten the construction period by reducing the thickness.

[0009]

As a first means, there is provided a steel frame refractory coating method in which the outer surface of a steel column 10 is refractory-coated with a refractory board 13 via a steel base material 11, 16 for mounting a refractory board also serving as a spacer. In the above steel base material 11,
A fireproof board 17, 18 is lined on the pillar side to form a heat-insulating base material, and the base material is attached to the outer surface of the steel frame column 10 at a predetermined interval in the circumferential direction. When the board 13 is attached, the steel column 10 is fire-resistant covered with the board.

As the second means, the first means is used, and the same type of the fire-resistant boards 13 and 18 for the backing as the fire-resistant board 13 for the fire-resistant coating is used.

As a third means, there is provided the first or second means, and the refractory boards 17, 18 are made of fiber reinforced gypsum board.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, known parts of the present invention will be briefly described. In FIG. 1, reference numeral 10 denotes a steel pipe column, which is made of a square steel pipe filled with concrete. A steel base material 11 made of an L-shaped steel is bonded to the four corners of the outer surface of the steel pipe with an adhesive over the entire length of the steel pipe column 10 in the vertical direction.

Then, the steel base material 11 is fastened with the fastening material 12. Next, the fiber-reinforced gypsum board 13 is applied to the outer surface of the steel base material 11 and fixed with tapping screws 14. At this time, a gap 15 is formed between the steel pipe column 10 and the gypsum board 13.

In the present invention, as shown in FIG.
A steel base material 16 made of I-shaped steel is adhered to the center of the four outer surfaces of the front, back, left and right side surfaces of the steel tube column 10 with an adhesive over the entire vertical length of the steel pipe column 10. Then, in the same manner as above, the steel base material 1 made of these I-beams is
6 is tightened together with a steel base material 11 made of an L-shaped steel, and a fiber reinforced gypsum board 13 serving also as a finishing material is applied to these outer surfaces and fixed with tapping screws 14.

In the present invention, the gypsum boards 17, 1 are used as the steel base materials 11, 16 made of L-shaped steel and I-shaped steel.
8 is lined to the pillar side. The gypsum boards 17 and 18 for backing are preferably of the same type as the fiber-reinforced gypsum board 13 attached to the outside of the steel base materials 11 and 16.

Further, as shown in FIG. 3 and FIG. 4, in the connection portion where the steel beam 19 of the H-section steel is joined to the steel pipe column 10,
Instead of the section steel, a pair of base members 20 made of L-section steel are used, and the beam webs are sandwiched and welded by these members, and both ends of the fastening member 12 are welded to the pair of base members 20. In the drawing, reference numeral 21 denotes a refractory coating of the steel beam 19.

Next, the fire-resistant coating structure A according to the present invention and the conventional fire-resistant coating structure B will be compared in terms of fire resistance performance using the graph shown in FIG. Both have a cross section: □ -300 ×
A hollow steel column a of 300 × 9, length: 2400 mm,
Although the point of covering with a 15 mm thick reinforced gypsum board b via a steel base material (not shown) is common, in the present invention, the steel base material is reinforced with a reinforced gypsum board c of the same type as the reinforced gypsum board b for coating. In contrast to lining, conventional methods do not.

The fire-resistant coating structure A according to the present invention is JIS A 1304
Is shown in graph X, and the measurement result of the conventional fire-resistant coating structure B under the same conditions is shown in graph Y under the same conditions. As is clear from graph X,
The time required for the steel column a in the present invention to reach the allowable value of 350 ° C. exceeds 60 minutes.

On the other hand, in the case of the conventional refractory coating structure B, it can be seen that the temperature exceeds 350 ° C. before reaching 60 minutes. Incidentally, in the case of the conventional example, the thickness of the reinforced gypsum board b for coating is 21 mm for 1 hour fire resistance and 42 mm for 2 hours fire resistance.
mm.

That is, according to the present invention, the allowable steel temperature and the cross-sectional dimension of the steel frame are made the same as those of the prior art by lining the same type of reinforced gypsum board on the back surface of the steel base material for attaching the reinforced gypsum board b which also serves as a finishing material. If evaluated in
The fireproof performance can be secured for 1 hour at 15 mm where the thickness of the reinforced gypsum board b is reduced by one size.

According to the new rules, the allowable steel temperature and the steel cross-sectional dimension can be set in accordance with the actual situation.
When 50 × 16) is evaluated as an allowable steel material temperature of 500 ° C., it has a fire resistance of 2 hours or more.

Next, the fire-resistant coating structure shown in FIGS. 6 to 8 and the fire-resistant coating structure according to the present invention will be compared in terms of fire resistance, workability, design, and estimated price. (1) Fire resistance The present invention can ensure the fire resistance performance for one hour when the thickness of the reinforced gypsum board is 15 mm. Spray rock wool method (Fig. 6) The thickness of the reinforced gypsum board is 35 mm for 1 hour fire resistance and 50 mm for 2 hours fire resistance. Calcium silicate plate attachment method (Fig. 7) The thickness of the reinforced gypsum board requires 25 mm for 1 hour fire resistance and 40 mm for 2 hours fire resistance. Reinforced gypsum board sticking method (FIG. 8) The thickness of the reinforced gypsum board is 21 mm for 1 hour fire resistance and 42 (21 + 21) mm for 2 hours fire resistance.

(2) Workability The present invention a. Since the reinforced gypsum board is also used as a finishing material, no finishing work is required. b. There is no need for on-site construction like the spraying rock wool method, and all components can be pre-processed, so that a certain level of quality can be ensured. c. Since no dust is generated and the working environment is good, the base work and the finishing work can be performed simultaneously. d. The amount of waste materials is small because the assembly work is mainly performed. Spray rock wool method (Fig. 6) a. Since it is necessary to attach a gypsum board for finishing to the outside of the sprayed rock wool, two operations, a fireproof coating operation and a finishing operation, are required. b. Gypsum board for finishing is a heavy equipment because it requires studs. c. Work environment is poor due to the generation of dust from sprayed rock wool. d. It takes time to cure the sprayed rock wool and clean it after work. Calcium silicate plate application method (Fig. 7) a. Since no dust is generated and the working environment is good, the base work and the finishing work can be performed simultaneously. b. The amount of waste materials is small because the assembly work is mainly performed. Reinforced gypsum board sticking method (Fig. 8) a. Since no dust is generated and the working environment is good, the base work and the finishing work can be performed simultaneously. d. The amount of waste materials is small because the assembly work is mainly performed.

(3) Designability The present invention a. The finished section of the column is small. b. Easy to paint and cloth finish. Spray rock wool method (Fig. 6) a. The finished section of the pillar is large. b. Separate finishing such as gypsum board is required. Calcium silicate plate application method (Fig. 7) a. Finished section of pillar is medium. b. Easy to paint and cloth finish. Reinforced gypsum board sticking method (Fig. 8) a. The finished section of the pillar is large. b. Easy to paint and cloth finish.

(4) Estimated price (yen / m ² ) 3950 when the thickness of the reinforced gypsum board is 15 mm. Spraying rock wool method (Fig. 6) 5610 (including finishing material) for 1 hour fire resistance, 6240 (including finishing material) for 2 hour fire resistance. Calcium silicate plate attachment method (Fig. 7) 6400 for 1 hour fire resistance and 807 for 2 hour fire resistance
0. Reinforced gypsum board sticking method (Fig. 8) 6510 for 1 hour fireproof, 870 for 2 hour fireproof
0.

(5) Evaluation The present invention: A (excellent) Spraying rock wool method (FIG. 6): C (impossible) Calcium silicate plate application method (FIG. 7): B (good) Reinforced gypsum board application method (FIG. 8) ): C (not possible)

[0027]

According to the present invention, since the fireproof board is lined with the steel base material, the amount of heat flowing into the fireproof board from the fire heating side is directly transmitted to the steel column through the steel base material as in the conventional case. Because there is no heat, the temperature rise of the steel column is suppressed as much as possible. Therefore, the thickness of the refractory board can be reduced as compared with the conventional art, and the cost can be reduced.

Further, since the refractory board is also used as a finishing material, no finishing work is required. Therefore, the construction period can be shortened, and the cost can be further reduced in combination with the above. Further, since the finished cross section of the pillar can be reduced, space can be saved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a steel frame refractory coating method according to the present invention.

FIG. 2 is a transverse sectional view of FIG.

FIG. 3 is a perspective view of a connection part.

FIG. 4 is a sectional view of FIG. 3;

FIG. 5 is a graph comparing the fire resistance performance of the present invention and the conventional example.

FIG. 6 shows a conventional example, and is a cross-sectional view by a spraying rock wool method.

FIG. 7 is a cross-sectional view of a calcium silicate plate attaching method.

FIG. 8 is also a cross-sectional view of a reinforced gypsum board sticking method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Steel column 13 Fireproof board 11, 16 Steel base material 17, 18 Backing fireproof board

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hirokazu Ohashi 1-5-1, Otsuka, Inzai City, Chiba Prefecture Inside Takenaka Corporation Technical Research Institute (72) Inventor Yoshito Ide 1-5-1, Otsuka, Inzai City, Chiba Prefecture Takenaka Corporation Technical Research Institute Co., Ltd. (72) Koji Yashima Inventor, Ginza 8-chome, Chuo-ku, Tokyo 8-21, Japan No. 1 Stock Company Takenaka Corporation Tokyo Head Office F-term (reference) 2E001 DE01 EA06 FA02 GA12 HA03 JD15 KA01 LA12 2E163 FA02 FB07 FB09 FB42

Claims (3)

[Claims] 1. A steel frame fireproof coating method in which the outer surface of a steel column 10 is fire-resistant covered with a fireproof board 13 via a steel base material 11 and 16 for mounting a fireproof board also serving as a spacer. The fireproof boards 17 and 18 are lined up on the pillar side to form a heat-insulating base material, and the base material is attached to the outer surface of the steel frame pillar 10 at predetermined intervals in the circumferential direction,
A steel frame fire-resistant coating method, wherein a fire-resistant board 13 is attached to the outer surface of the base material so that the steel column 10 is fire-resistant covered with the board. 2. The steel frame fireproof coating method according to claim 1, wherein said fireproof boards 17 and 18 for backing are of the same type as the fireproof board 13 for fireproof coating. 3. The steel frame fireproof coating method according to claim 1, wherein said fireproof boards 17 and 18 are made of fiber reinforced gypsum board.