JPH06158765A - Form for executing concrete slab with haunch - Google Patents

Abstract

PURPOSE:To machine the end section of a plate simply by installing the deck plate, in which ribs are curved and formed by length-variable central sections and length-fixing end sections at regular intervals in the undersides of the plate. CONSTITUTION:Ribs 2 extended between a steel beam A in triangular cross sections at regular intervals are curved and formed to the underside of a flat deck plate 1, and the plate 1 is formed by a length-fixing end section 1a and a length-variable central section 1b. The ribs 2 are curved and shaped so that height thereof is reduced gradually in the length-fixing end section 1a, and the length Lh of a haunch section and deck height Dh are set freely in response to the design of a slab. The ribs 2 of the fixing end section 1a are fitted to the ribs 2 of the length-variable central section 1b and clamped by fixing screws 4, and set onto the steel beam A and concrete B is placed. Accordingly, the slab with the haunch can be carried out easily without anti-timbering.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a formwork for a concrete slab with a haunch used to construct a concrete slab with a haunch.

[0002]

2. Description of the Related Art Conventionally, for a slab with a haunch, a mold such as a veneer mold is processed on site to mold a concrete slab for the haunch. Further, in the conventional flat deck, as shown in FIG. 8, the deck plate a is cut in accordance with the slab effective span, the rib portion a ₁ at the end is compressed to the upper surface, and the end haunch forming part is added, A slab concrete C is laid between the steel beams A.

[0003]

The former on-site processing of a veneer form or the like requires a great deal of work and is disadvantageous in terms of construction cost and construction period. In addition, support work is required. Also, the latter flat deck secondary machining is very complicated when the slab has various effective spans, and particularly, the end machining is troublesome.

The present invention has been proposed in view of the above-mentioned problems of the prior art. The object of the present invention is to simplify the processing of the end portion of the deck plate and freely adjust the length. The point is to provide a formwork for a concrete slab construction with a haunch that does not require support work.

[0005]

In order to achieve the above object, in the concrete slab construction form with a haunch according to the present invention, ribs extending between the steel beams are bent on the lower surface of the plate at predetermined intervals. The flat deck plate for slab is composed of the variable length central part and the fixed length end part,
It is constructed by gradually reducing the deck height at the fixed end.

According to a second aspect of the present invention, the rib of the variable length end portion of the flat deck plate is fitted to the rib of the variable length center portion by a required length, and both ribs are fixed.
A groove portion formed at the upper end of the variable length central portion is closed by a concrete flow stop lid.

[0007]

Since the present invention is constructed as described above,
A fixed length end with a gradually decreasing deck height and a variable length central part are overlapped with each other so that the deck height has the required slope according to the effective span of the haunched concrete slab to be constructed. It is to assemble slabs with haunches by assuring assembly, laying between beams on site, using this as a formwork, placing reinforcements and concrete on the deck plate without providing support work. is there.

[0008]

The present invention will be described below with reference to the illustrated embodiments. Reference numeral 1 is a flat slab deck plate for a slab with a haunch, and ribs 2 having a triangular cross-section and extending between steel beams are formed at predetermined intervals on the lower surface of the plate, and a length fixed end portion 1a for haunch slab molding and a variable length are provided. It is composed of a central portion 1b.

In the figure, La and Lb are the lengths of the fixed length end portion and the variable length center portion, respectively, and Lx is the slab short side effective span. Then, at the fixed length end portion 1a, as shown in FIGS. 2, 3 and 4, the ribs are bent so that the height thereof is gradually reduced, whereby the deck height Dh is gradually reduced,
A haunch portion is formed at the fixed length end portion 1a.

Lh is the length of the haunch portion. The concrete slab formwork 3 with a haunch formed in this manner is bridged between the adjacent steel beams A, and the concrete B is placed on the formwork 3 without using the support work to form the slab with a haunch. It is to be constructed. In the figure, t ₁ is the thickness of the central portion of the slab and t ₂ is the thickness of the end portion of the slab.

The length Lh of the haunch portion and the deck height Dh can be freely set and manufactured according to the design of the slab.
As shown in FIG. 7, the rib 2 of the fixed end portion 1a is fitted into the rib 2 of the variable length central portion 1b according to the effective span Lx of the short side of the slab to secure the overlap margin Lc to secure the both portions 1a. , 1
The rib 2 of b is tightly connected with the fixing screw 4. At this time, the groove 5 generated in the variable central portion 1b is closed by the lid piece 6 to prevent the concrete from flowing.

The flat slab deck plate 1 for the slab with the haunch thus assembled is set on the steel beam A in the slab construction section on site and welded, and after the reinforcement work, concrete B is placed and the whole process is completed. To do.

[0013]

As described above, according to the present invention, a flat deck plate for a slab, in which ribs extending between the steel beams are bent at predetermined intervals on the lower surface of the plate, is provided with a variable length central portion and a long length. A construction form is constructed on the concrete slab with a haunch by gradually reducing the height of the rib at the fixed end, and the construction of the slab with a haunch is carried out by the same form without support. Easily done.

According to the invention of claim 2, the rib of the fixed length end portion of the deck plate is fitted to the rib of the variable length central portion by a required length, and both ribs are fixed to fix the length of the deck plate. The adjustment processing in the depth direction is easily performed, and at this time, by closing the groove formed at the upper end of the variable central portion with the concrete flow stop lid, the concrete is prevented from flowing out from the groove.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional view showing a use state of an embodiment of a formwork for a concrete slab with a haunch according to the present invention.

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

3 is a view taken along the line BB of FIG.

FIG. 4 is a view taken along the line CC in FIG.

5 is a perspective view of FIG. 1. FIG.

FIG. 6 is a vertical sectional view of a concrete slab with a haunch constructed using the formwork of the present invention.

FIG. 7 is a perspective view showing a joint portion of the mold of the present invention.

FIG. 8 is a vertical cross-sectional view of a concrete slab with a haunch that uses a formwork having a conventional structure.

[Explanation of symbols]

A Steel beam B Concrete 1 Flat slab deck plate for slab with haunch 1a Length fixed end 1b Variable length central part 2 Rib 3 Concrete slab formwork with haunch 4 Fixing screw 5 Groove 6 Lid piece

Claims (2)

[Claims] 1. A flat deck plate for a slab, in which ribs extending between steel beams are bent at predetermined intervals on the lower surface of the plate, the flat deck plate having a variable length center portion and a fixed length end portion, Formwork for concrete slab construction with haunch, characterized in that the deck height at the fixed end is gradually reduced. 2. A rib at the variable length end portion of the flat deck plate is fitted to the rib at the variable length center portion for a required length, both ribs are fixed, and an upper end portion of the variable length center portion is formed. The formwork for concrete slab construction with a haunch according to claim 1, wherein the groove portion formed in the above is closed with a concrete flow stop lid.