JPH028031Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a technology for improving the reinforcement structure in cantilevered slabs such as corridors and balconies, and aims to simplify the support structure for the bottom reinforcement, thereby reducing costs and improving workability. The purpose is to ensure sufficient coverage of the most important upper and lower end reinforcements.

Embodiments of the present invention will be described below with reference to the drawings.

In the cantilever slab of the corridor shown in Figure 1, 1
2 is a beam main reinforcement, 2 is a stirrup, and 3 is a supporting reinforcement provided with upper and lower hooks a and b, which are fixed to the beam main reinforcement 1 from above. The support bars 3 include a support part for suspending and supporting the base end of the slab of the upper end reinforcement 8 to the beam main reinforcement 1, which will be described later, and a support part for suspending and supporting the slab base end of the bottom end reinforcement from the beam main reinforcement 1. These are bent and formed using a single reinforcing bar.

Reference numerals 4 and 5 denote force distribution bars, and the distribution bar 4 on the free end side of the slab is supported by a spacer 7 erected on the upper surface of a portion corresponding to the free end side of the slab of the bottom formwork 6 for cantilever slab forming; The distribution reinforcement 5 on the base end side of the slab is engaged with and supported by the upper hook a of the support reinforcement 3.

Reference numeral 8 denotes an upper end reinforcement, which is placed across the distribution reinforcements 4 and 5, and has a downwardly bent portion 8a formed at its base end, and a downwardly bent portion 8a at its distal end. A bending portion 8b and a bending receiving portion 8c which is continuous with the lower end of the bending portion 8b and bent toward the proximal end of the slab are formed.

9 and 10 are receiving reinforcements, respectively, and the receiving reinforcement 9 on the free end side of the slab
is supported by the bent receiving portion 8c of the upper end reinforcement 8, and the support reinforcement 10 on the base end side of the slab is engaged and supported by the lower hook b of the support reinforcement 3.

Reference numeral 11 denotes a lower end reinforcement, which is placed across the support reinforcements 9 and 10, and has an upwardly bent portion 11a and a bent portion 11b horizontally bent from the upper end thereof. is formed. 12... is a reinforcing bar.

The reinforcing structure of the cantilevered slab according to the present invention has the above-mentioned configuration, and one procedure for the reinforcement arrangement is as follows: First, the support bars 3 are engaged with and supported by the beam main reinforcements 1, and the support bars 3
The distribution bar 5 and the receiving bar 10 are engaged and supported by the upper and lower hooks a and b. Then, the base end side of the slab of the upper end reinforcement 8 is placed on the distribution reinforcement 5, and the receiving reinforcement 9 is supported by the bending receiving portion 8c of the upper end reinforcement 8.

Next, the lower end reinforcement 11 is mounted across both receiving reinforcements 9 and 10, and if necessary, the reinforcing bars are bound together with wires, etc., and the upper end reinforcement 8 and the lower end reinforcement 12 are similarly placed on the reinforcing bars 12. Tie it to the thread 11.

Next, the distribution reinforcement 4 on which the tip side of the upper end reinforcement 8 is mounted
is lifted up, and this distribution bar 4 is mounted on a spacer 7 which is erected on the bottom formwork 6 for cantilever slab molding.

With the above steps, the reinforcement arrangement is completed. At this time, the height of the hooks a and b of the support reinforcement 3, the height of the spacer 7, and the tip side bent portion 8b of the upper end reinforcement 8 are determined. By setting the respective lengths as prescribed, it is possible to sufficiently cover the slab concrete A with not only the upper end reinforcement 8 but also the lower end reinforcement 11 with only the spacer 7 for the upper end reinforcement 8. As shown in Fig. 2, the upper end reinforcement 23 and the lower end reinforcement 24 tied to the beam main reinforcement 21 and stirrup 22 were supported separately by spacers 25 of different shapes to ensure cover. However, compared to such a reinforcement structure, the spacer 25 for supporting the lower end reinforcement can be omitted by simply forming the bending part 8b and the bending receiving part 8c at the tip of the upper end reinforcement 8. Coupled with the omission of on-site work for spacer installation, cost reductions in reinforcement arrangement can be achieved.

Note that the upper end reinforcement 8 supports the receiving reinforcement 9 on the tip side of the lower end reinforcement.
This is the downward bending part 8 as the bending part 8c.
It may be bent from the lower end of b toward the free end of the slab, and may be hook-shaped with an upwardly rising portion, or the end may be located above the bending point. Further, the spacer 7 may be erected at a predetermined location of the bottom formwork 6, and after the force distribution bar 4 is mounted on the spacer 7, the spacer 7 can be placed on the force distribution bar 4. The reinforcement procedure can be changed as appropriate, such as placing the upper end reinforcement 8 on top.

As explained above, the reinforcing structure of the cantilevered slab according to the present invention is such that a spacer for supporting the upper end reinforcement is erected on the upper surface of the bottom formwork for cantilevered slab molding on the free end side of the slab, and the force is distributed to this spacer. The upper end reinforcement is mounted on the upper end reinforcement, and the tip of the upper end reinforcement has a downward bending part and a bending receiving part connected to the lower end of the bending part, and the bending receiving part has a The present invention is characterized in that the lower end reinforcement is mounted on the support reinforcement, while the base end sides of the slab of the upper end reinforcement and the lower end reinforcement are suspended and supported by the beam main reinforcement, respectively.

In other words, although the improvement is only by bending the tip of the upper reinforcement, it eliminates the need for a spacer for supporting the lower reinforcement, which was required in the past, which is advantageous not only in terms of cost reduction in reinforcement but also in terms of workability. Ta.

Moreover, since the lower end reinforcement is reliably supported in a suspended state, it is now possible to ensure sufficient coverage not only of the upper end reinforcement but also of the lower end reinforcement.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a longitudinal sectional view of a cantilevered slab, and FIG. 2 is a longitudinal sectional view of a conventional cantilevered slab for comparison with the present invention. 6... Bottom formwork for cantilever slab molding, 7... Spacer for supporting upper end reinforcement, 8... Upper end reinforcement, 8b... Bending part, 8c... Bending receiving part, 9... Retaining bar, 11... ...lower end muscle.

Claims (1)

[Scope of utility model registration request] A spacer for supporting the top reinforcement is erected on the upper surface of the portion corresponding to the free end of the slab of the bottom formwork for cantilever slab forming, and the top reinforcement is placed on this spacer via the distribution reinforcement, and the tip of the top reinforcement is placed on the spacer. The part has a downward bending part and a bending receiving part connected to the lower end thereof, and the lower end reinforcement is mounted on the bending receiving part via the receiving reinforcement, while the upper end reinforcing A reinforcement structure for a cantilever slab, characterized in that the base end sides of the slab of the lower end reinforcements are suspended and supported by the main beam reinforcements.