JPH0649922A - Fire proof coating on fitting part of steel frame duct - Google Patents

Abstract

PURPOSE:To carry out a fire-proof coating on the fitting part of a duct in a beam or the like made of steel frames, without bringing about repairing works. CONSTITUTION:At first, a short pipe 2 as a part of ducts installed here is fitted in the pierced hole 12 provided in the web 11 of a steel skeleton beam 1 by use of a metal tool 3. This metal tool 3 is composed of a fitting part 31 to be fixed at the outer face of the short pipe 2 and a holding part 32 to nip the web 11 through a reinforcing member 15. A specified distance of clearance B can be opened between the outer peripheral face of the short pipe 2 and the inner face of the pierced hole 12. Thereafter, when a fire proof coating is applied on the skeleton steel beam 1, a fire proof coating is also applied for the clearance B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of applying a fireproof coating to a duct mounting portion of a steel frame.

[0002]

2. Description of the Related Art When a duct is attached to a steel beam or the like in a penetrating state, a sleeve is usually provided in advance on a steel web, and this is used as a through hole for passing the duct, and the duct is passed through the sleeve. However, as a fire prevention measure, it is necessary to apply a fireproof coating to the entire steel beam. Since this fireproof coating must be applied to the inner surface of the sleeve with a predetermined thickness or more, conventionally, the fireproof coating is applied to the entire surface of the steel beam including the inner surface of the sleeve, and then the duct is installed in the sleeve. Was.

[0003]

However, in the above-mentioned conventional method, the inner diameter of the sleeve is smaller than the outer diameter of the duct due to the fireproof coating on the inner surface of the sleeve.
When the duct was passed through the sleeve, the fireproof coating was often damaged and repair work was required. The present invention, by attaching a duct to the through hole with a gap corresponding to the required fireproof coating thickness between the through hole and the duct being opened,
An object of the present invention is to solve the above problems by making it possible to perform fireproof coating on a duct mounting portion of a steel frame after mounting the duct.

[0004]

In order to achieve the above object, the present invention provides a short tube which forms a part of a duct which is attached to a through hole formed in a steel web, and which is provided with the outer surface of the short tube. After attaching to the through hole with a metal fitting that maintains a predetermined amount of clearance between the through hole and the duct mounting portion of the steel frame, fireproof coating is applied to the duct mounting portion of the steel frame. I will provide a.

[0005]

According to the method of the present invention, since the fireproof coating on the duct mounting portion of the steel frame is performed after the short pipe forming a part of the duct to be mounted is attached, the duct is passed through the through hole after the fireproof coating. It does not damage the fireproof coating as in the method of. Moreover, since the short pipe is installed with a predetermined gap between the outer surface of the steel pipe and the through hole of the steel frame, a fireproof coating is applied to the gap, and the fireproofing required for the duct installation part of the steel frame. The coating can be performed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a front view of a steel beam for explaining the method of this embodiment, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 shows a state in which this method is carried out. FIG.

As can be seen from FIGS. 1 and 2, the web 11 of the steel beam 1 is provided with a through hole 12 for mounting a duct having a circular cross section. Then, a reinforcing plate 15 formed by forming a hole having a diameter corresponding to the through hole 12
Are fixed to both sides of the web 11. In the method of the present invention, the short tube 2 forming a part of the duct to be attached is attached to the through hole 12 in such a state that a predetermined amount of gap B is formed between the short tube 2 and the outer peripheral surface of the short tube 2. Here, one end sandwiches the web 11 from the inside of the through hole 12 through the reinforcing plate 15, and the other end faces the outer surface of the short pipe 2 and is fixed with a screw 3
It was used.

As shown in FIG. 2, the metal fitting 3 has a shape in which the upper ends of plate members corresponding to two vertical bars of H of a member having an H-shaped side cross section are vertically bent to the outside. Are doing Each of the bent ends becomes a mounting portion 31 that faces the outer surface of the short tube 2, and both legs of H are in the web 11.
It is a sandwiching portion 32 for sandwiching. Each attachment portion 31 has a screw hole.

The space between both legs of the metal fitting 3 is slightly loosened in accordance with the total thickness of the web 11 sandwiched between the two reinforcing plates 15. Therefore, this metal fitting 3
Can be moved along the through hole 12 while sandwiching both sides of the two reinforcing plates 15 with the sandwiching portion 32. In addition, the vertical bar of the portion of the metal fitting 3 extending from the horizontal bar of H to the mounting portion 31 side has a gap between the through hole 12 and the short pipe 2 at a predetermined amount (set to a required fireproof coating thickness or more) between them. The length is set to be B.

On the other hand, in the short pipe 2, a pair of screw holes 21 is previously formed at a predetermined position (here, a position where the circumferential surface circle is divided into three equal parts).
Is provided, and the nut 22 is attached to the inner surface of the short pipe 2 in accordance with this.
Is fixed. Further, both ends of the short tube 2 are closed with a temporary lid 23. Here, first, three metal fittings 3 are attached to the lower side by sandwiching the web 11 from the inside of the through hole 12 via the reinforcing plate 15 with the sandwiching portion 32, and then the short pipe 2 is inserted into the through hole 12. To penetrate. First, the screw hole of the mounting portion 31 of one metal fitting 3 and the screw hole 21 of the short pipe 2 are aligned and fixed with the iron plate screw 4. When the duct 3 is rotated in this state, the sandwiching portion 32 of the metal fitting 3 moves along with the duct 3 along the through hole 12. Then, when the next screw hole 21 of the duct 3 comes to the lower side, the second metal fitting 3 is fixed here with the iron plate screw 4 in the same manner as described above, and the short pipe 2 is further rotated to the last screw hole 21. Attach the third metal fitting 3 to.

In this way, after the short pipe 2 is attached to the steel beam 1 in the state where a predetermined amount of the gap B is formed between the through hole 12 of the steel beam 1 and the outer peripheral surface of the short pipe 2, the steel frame When the fireproof coating C is applied to the beam 1, as shown in FIG. 3, the fireproof coating C1 is also applied in the gap B, so that the duct attachment portion of the steel beam 1 can be provided with the necessary fireproof coating. Then, by removing the temporary lid 23 of the short pipe 2 and connecting the ducts 5 to both ends of the short pipe 2, the installation of the duct on the fire-resistant coated steel beam 1 is completed.

In the above embodiment, the case where the duct is attached to the web 11 of the steel beam 1 has been described, but the method of the present invention can naturally be applied to steel members other than the beam.

[0013]

As described above, according to the method of the present invention, since the fireproof coating on the duct mounting portion of the steel frame is performed after the duct is mounted, the fireproof coating is not damaged. Moreover, since the duct is installed with a predetermined gap left between the outer surface of the duct and the through hole of the steel frame, a fireproof coating is also applied to the inside of the gap, and the fireproof coating required for the duct installation portion of the steel frame is provided. It can be performed. As a result, the fireproof coating on the duct mounting part of the steel frame is surely applied,
It eliminates the need for repair work as in the past and improves work efficiency.

[Brief description of drawings]

FIG. 1 is a front view of a steel beam for explaining an embodiment of a method of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a schematic diagram showing a state in which the method of this embodiment is performed.

[Explanation of symbols]

 1 Steel beam 11 Web 12 Through hole 2 Short pipe 5 Duct B Gap C Fireproof coating

Claims (1)

[Claims] 1. A short tube forming a part of a duct attached to a through hole formed in a steel web, and a metal fitting for holding a predetermined gap between the outer surface of the short tube and the through hole. A fireproof coating method for a duct mounting portion of a steel frame, which comprises applying a fireproof coating to the duct mounting portion of the steel frame after being mounted in the through hole.