JPS6221100B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a reinforcing bar arrangement method for slab top end reinforcing bars.

In general, the part divided by the short side effective length LX and the long side effective length LY of the slab is defined as a block, and the middle side excluding approximately LX/4 from both sides of the long side length LY in the block. and the length LX in the short side direction
The part defined by approximately LX/4 from both sides is defined as end A, and approximately from both sides of length LX in the short side direction.
The part defined by approximately LX/4 from the middle side excluding LX/4 and both sides of the length LY in the long side direction is defined as the end part A', and is approximately LX/4 shorter than both sides of the length LY in the long side direction. Corner C is defined as each of the four corners defined by approximately LX/4 from both sides of the length LX in the side direction, and the middle side and short side direction excluding approximately LX/4 from both sides of the length LY in the long side direction. The part defined by the middle side of both sides of the length LX excluding approximately LX/4 is defined as the center part B,
Reinforcing bars at the top of the slab are placed with consideration given to the load distribution in those areas.

In other words, as shown in Figure 1, in the block surrounded by beams 1, 2, 3, and 4 (5 in the figure indicates a column), dense reinforcing bars are placed at the ends A and A' where tensile stress is applied. , rough reinforcing bars are placed in the center part B and corner part C where no tensile stress is applied.

All the joints or fixings on the beam of the main reinforcements arranged at the adjacent ends A, A' across the beam are made on the girder 6 or the small beam 7, as shown in FIGS. 2A and B.

In the figure, 8 and 9 indicate the main reinforcement direction, and 10 and 11 indicate the reinforcing bar arrangement in the distribution bar direction. This was true both in the case of conventional hand-assembly and in the case of reinforcing bar netting with welded intersections.

However, in this case, on the beam, the two joint allowances from both sides butt against each other, and the reinforcement at the ends A and A' in particular becomes dense, which causes problems when pouring concrete into the beam. There are construction problems such as poor concrete cover on the beams due to the springing up of the beams.

The present invention has been made in view of the above circumstances, and its gist is that the main reinforcement between the adjacent ends A and A' across the beam is arranged as shown in Figure 2 A and B.
As shown in the figure, when the structure is such that a single piece passes through the beam without joints or anchoring, and reinforcement is required in the center part B to prevent cracks, the center part should be approximately LX/4.
By performing joint processing at the part where the tensile stress is greatest, a single reinforcing bar penetrates through the beam, completely fulfilling the purpose assigned to the reinforcing bar, and eliminating the disorder of the crowded reinforcement arrangement on the beam. The aim was to eliminate problems during pouring.

Hereinafter, details of the present invention will be explained based on embodiment figures.

In other words, in Fig. 3A, a single main bar 14 is passed between the adjacent ends A' across the beam 3, and the beams are connected to the adjacent ends A' and corner C across the beam 3. The reinforcement bars 16 are arranged along the beams 3 and across the beams 2 and 4 perpendicular to the beam 3 to form an H shape, and the reinforcing bar net 12 is welded at the intersection of the main reinforcements 14 and the distribution bars 16. Figure 3(b) shows the main reinforcement 15, which is made of a single piece, and is arranged between the adjacent ends A with the beam 2 in between, and the main reinforcement 15 which is arranged on the beam 2 and the adjacent ends A with the beam 2 in between. At end A, corner C, along beam 2,
In addition, the reinforcing bar network 1 is formed into an H shape by the distribution bars 17 arranged so as to span the beams 1 and 3 orthogonal to the beam 2, and the intersections of the main reinforcements 15 and the distribution bars 17 are welded.
3 is arranged on the beam 2.

In the corner C, the distribution bars 16 and 17 are connected to the ends A,
The reason why it is extended from A' to the tip is so that when interference with columns, etc. occurs at that extended part, it is possible to easily bend the distribution bar to adjust to the current situation.

When arranging reinforcement by hand, it can be applied by tying the intersections of the main reinforcement and distribution reinforcement.

Furthermore, when it is necessary to arrange reinforcement to prevent cracks in the central part B, joints 14' and 15' are provided at positions approximately LX/4 in the central part of the main reinforcements 14 and 15. Rebar nets 18 and 19 installed for beams 1 and 4 that do not have adjacent ends A, A' or corner C across the beams.
As is clear from FIGS. 3A and 3B, this structure corresponds to a half-cut structure of the reinforcing bar nets 12 and 13 from which unnecessary parts have been removed.

Figure 3 C shows these reinforcing bars 12, 13, 1
8 and 19 are completed on the beams of beams 1, 2, 3, and 4. As a result, the intersection of reinforcing bars that occurs in corner C is fixed by bundling. The corner C, which is indicated by an x mark in the figure, is not subject to tensile stress.
Therefore, it is sufficient to simply tie the reinforcing bars so that the arrangement of the reinforcing bars does not shift.

The reinforcing bar network 20 shown in FIG.
22 are all in a relationship that butts against the dense main reinforcements 14 and 15 at the ends A and A', and there is no need to make them dense, so that the joints with the main reinforcements 14 and 15 are processed at a position of approximately LX/4 in the center. Make it.

This aspect is shown in FIG. 3E.

According to the present invention, with the above-mentioned configuration, the main reinforcement placed between the adjacent ends A and A' across the beam is passed through as a single piece without being jointed or fixed on the beam. Congestion of the reinforcing bars is eliminated, concrete can be poured into the beam without any problems, and there is no problem of poor covering on the beam due to the reinforcing bars jumping up. The joints are performed in safe positions where no tensile stress is applied, and this is an excellent installation method that establishes the structural significance of the joints and allows even amateurs to easily install slab top reinforcements.

[Brief explanation of the drawing]

Figure 1 is a load distribution diagram of the reinforcement at the top of the slab, Figure 2 is an explanatory diagram showing the conventional reinforcement arrangement relationship on the beam, and Figure 3
5 is a procedure diagram of the method of the present invention. A simple explanation of the symbols, 1, 2, 3, 4...beams,
A, A'...end, B...center, C...corner,
5...Column, 6...Large beam, 7...Small beam, 8,9,1
4, 15... Main reinforcement, 10, 11, 16, 17...
Distribution bars, 12, 13, 18, 19, 20... reinforcing bar network.

Claims (1)

[Claims] 1. When installing slab top reinforcement on a block surrounded by beams, the beams should be placed so that the required reinforcement is suitable for the ends A, A', center B, and corner C, which are divided by load distribution. A single main reinforcing bar arranged in the adjacent ends, parallel to the beam and adjacent ends and corners, along the beam and perpendicular to the beam. A reinforcing bar installation method for slab top end reinforcing bars, which is characterized in that a reinforcing bar network formed by H-shaped distribution bars arranged in the following manner and welded at their intersections is placed on the beam.