JPH05311773A - Fire resisting covering permanent form for steel beams - Google Patents

Abstract

PURPOSE:To provide excellent fire proofing properties and reduce work period as well. CONSTITUTION:A permanent form 3 for fire proof covering is set in a lower part flange 1a of a steel beam 1 by way of a form receiving flat bar 2. The fireproof covering form 3 consists of a lip slot section 3a and two side plates 3b. The lip slot section 3a is formed in such a fashion that it may envelop the lower part flange 1a of the steel beam 1 at a proper span and opened between upper part lips 3a'. The side plate 3b is extended upward from the inner tip of the lip 3a'. The form receiving flat bar 2 is set in such a fashion that it may be clamped between the flange 1a and the lip 3a'. As a result, the form 3 is hooked up on the lower part flange 1a by way of the form receiving flat bar 2. The fireproof covering form 3 whose beam span is divided into several sections. When the form 3 is completely set in, a PC slab 4 is installed to the steel beam 1 where concrete is cast so that the peripheral parts of the steel beam 1 may be filled up.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste formwork for fireproof coating of steel beams.

[0002]

2. Description of the Related Art Generally, in a building made of steel frame, it is necessary to cover the steel frame of the main structure from the heat of a fire and to maintain the structural strength.

Conventionally, as a fireproof coating method for steel beams, A
There were a method of forming a plate to attach an LC plate or a calcium silicate plate to a steel beam with metal fittings or an adhesive, and a method of spraying asbestos or rock wool onto a steel beam to which an adhesive was applied with a spray gun.

However, the above-mentioned forming plate construction method has a problem in that it is necessary to fill the uselessness with putty so as not to create a gap after processing, resulting in poor yield such as damage due to damage or allocation, and the above-mentioned problem. In the spraying method, the spraying material is weak against water, so it is necessary to fully cure it so that it will not get wet with rain after construction, and to prevent peeling, it is necessary to manage the base and spray thickness. There was a problem that it took time for construction management such as management and management of mixing of materials.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned conventional problems, and an object of the present invention is to provide a steel frame beam which has excellent fire resistance and can shorten the construction period. The present invention is to provide a waste formwork for refractory coating.

[0006]

DISCLOSURE OF THE INVENTION A waste formwork for fireproof coating of a steel frame beam according to the present invention comprises a rib groove part formed so as to surround a lower flange of the steel beam, and ribs on both sides of the rib groove part. And a side plate portion formed so as to extend upward from the tip end portion of the above, and formed so as to spread with each other. The ribs are hooked on a form receiving flat bar appropriately arranged on the upper surface of the lower flange portion to set the fireproof coating discard form on a steel beam. The refractory coating waste formwork has a nested slide structure.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, reference numeral 1 is a steel frame beam made of I-shaped steel, and a lower frame 1a is provided with a discard form 3 for refractory coating via a form receiving flat bar 2. The steel beam 1 may be H-shaped steel.

The refractory coating discard mold 3 is composed of a lip groove mold portion 3a and two side plate portions 3b. The lip groove type portion 3a is formed so as to surround the lower flange 1a of the steel beam 1 with a proper gap, and opens between the upper lips 3a '. The width of this opening is slightly wider than the width of the lower flange 1a so that the lower flange 1a can be easily inserted into the lip groove type portion 3a. The side plate portion 3b extends upward from the inner tip of the lip 3a '.
The upper end portion of the side plate portion 3b extends to the position of the upper surface of the upper flange 1b. Further, the left and right side plate portions 3b are widened upward from each other to form a gap for placing concrete with the upper flange 1b.

The form receiving flat bar 2 is set in a state of being sandwiched between the flange 1a and the lip 3a ', and as a result, the form 3 is lowered via the form receiving flat bar 2 into the lower flange 1a. Is hung on. The flat bars 2 are arranged at appropriate intervals (for example, 900 mm intervals).

The refractory coating sacrificial form 3 has a length obtained by dividing the length of the beam span into several pieces (for example, two or three). They are assembled to each other in a nested slide structure, set on the steel beam 1 and then slid to extend the length of the beam.

After the setting of the form 3 is completed, next, referring to FIG.
Further, as shown in FIG. 4, the PC slab 4 is installed on the steel beam 1. A notch 4a is formed in the PC slab 4, and a hole H for concrete pouring is formed between the PC slab 4 and the upper flange 2b. Therefore, concrete is poured from this hole H at the same time as the slab concrete to fill the periphery of the steel beam 1 with concrete.

[0012]

【The invention's effect】

1) Since the formwork of the present invention enables fireproof coating with concrete, it has high coating strength and good adhesion to steel frames, and there is no fear of dropping after construction, and it is also water resistant and easy to cure. In addition, since the construction is done at the same time as the concrete is poured into the slab, the construction period can be shortened. 2) The formwork of the present invention has a nesting type slide structure, so that it has good workability and does not require on-site processing, and because it has a prefabricated structure, it does not require skilled workers. 3) Since reinforcement reinforcing bars are not arranged, it is only necessary to pour concrete, and workability is good. 4) Since concrete satisfies only the fire resistance, the iron plate may have the smallest beam cross-sectional shape to reduce the weight.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state where a mold of the present invention is set on a steel beam.

FIG. 2 is a cross-sectional view of FIG.

FIG. 3 is a perspective view of a PC slab installed on a steel beam.

FIG. 4 is a cross-sectional view in which a PC slab is installed on a steel beam.

[Explanation of symbols]

 1 Steel beam 1a Lower flange 1b Upper flange 2 Form receiving flat bar 3 Fireproof coating discard form 3a Rib groove form 3a 'Rib 3b Side plate 4 PC slab 4a Notch H hole

Claims (3)

[Claims] 1. A rib groove type portion formed so as to surround a lower flange of a steel frame beam, and extending upward from tip ends of ribs on both sides of the rib groove type portion, and formed so as to spread with each other. A discard formwork for a fireproof coating of a steel beam, comprising a side plate portion. 2. The fire resistance of a steel frame beam according to claim 1, wherein the rib is set on a steel frame beam by being hooked on a form receiving flat bar appropriately arranged on the upper surface of the lower flange portion. Discarding formwork for coating. 3. A discard formwork for fireproof coating of a steel beam according to claim 1 or 2, which has a nested slide structure.