JPH0327073Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention relates to shear reinforcing bars for solid foundations.

Conventional technology Generally, solid foundations for special buildings such as nuclear power plants are constructed quite thickly, but this type of solid foundation is made by arranging multiple shear reinforcing bars between the bottom main reinforcement and the top main reinforcement. Shear strength is increased.

Conventionally, large-diameter reinforcing bars have been used for this type of shear reinforcement. Further, a hook is formed at the lower end for the purpose of ensuring fixation and restraining the lower end main reinforcement.

Problems that the invention aims to solve However, if a 180° hook is formed at the lower end of a shear reinforcing bar made of large-diameter reinforcing bars, the shape of the hook becomes large and reinforcement work becomes impossible, so it is unavoidable.
The hook is 90° and the length of the hook is 8d or less.

For this reason, the shear reinforcement currently used is
With a 90° hook, the shear reinforcement function is not fully satisfied because sufficient anchoring force is secured and the restraining effect of the bottom main reinforcement is small.

This idea was proposed to solve the above-mentioned conventional problems, and it is possible to form a 180° hook that is extremely effective as an anchor for the end of the reinforcing bar, and also to make the bar arrangement work extremely easy. It is an object of the present invention to provide a shear reinforcing bar for solid foundations that can be used to strengthen concrete foundations and has an extremely high shear reinforcing effect.

Means for solving the problem This idea is to arrange upper shear reinforcement bars and multiple small diameter lower shear reinforcement bars between the upper and lower main reinforcements of a solid foundation by extending them in opposite directions from the upper and lower main reinforcements. In addition, a 180° hook is provided at the base end of the upper shear reinforcement and the lower shear reinforcement, the upper shear reinforcement and the lower shear reinforcement are overlapped, and a plurality of ring reinforcements are arranged in this part. By doing so, the above objective is achieved.

Embodiment Hereinafter, an embodiment illustrating this invention will be explained (see FIG. 12). A plurality of upper end main reinforcements 2 and lower end main reinforcements 3 are arranged in a lattice shape and in multiple stages in a solid foundation 1.

Between the upper end main reinforcing bars 2 and the lower end main reinforcing bars 3, one to a plurality of upper shear reinforcing bars 4 and a plurality of lower shear reinforcing bars 5 are arranged so as to extend substantially perpendicularly to each other.

The base end of the upper shear reinforcing bar 4 is inserted into the two groups of upper main bars, and a 180° hook 7 is formed at its tip. In addition, the upper shear reinforcing bars 4 are formed from relatively thick reinforcing bars in the case of one, and are formed from relatively thin reinforcing bars in the case of multiple upper shear reinforcing bars, and are arranged in a substantially circular shape.

Furthermore, the lower end portion of the upper shear reinforcing bars 4 is inserted into a group of lower shear reinforcing bars 5, and is overlapped with the lower shear reinforcing bars 5 by a predetermined length.

In this case, if there is only one upper shear reinforcing bar 4, it is inserted into the center of the lower shear reinforcing bar 5 group, and if there are multiple upper shear reinforcing bars, it is inserted along the periphery of the lower shear reinforcing bar 5 group.

The lower shear reinforcing bars 5 are arranged in a substantially circular shape. The base end of the lower shear reinforcing bar 5 is the lower end main bar 3
It is inserted into the group and has a 180° hook 7 bent outward at its tip.

In addition, a plurality of ring reinforcements 6 are inserted vertically at regular intervals in the overlapping part A of the lower shear reinforcement 5 and the upper shear reinforcement 4, thereby connecting both shear reinforcements. There is.

With this configuration, a plurality of sets of solid foundation shear reinforcing bars are assembled between the upper and lower main bars 2 and 3 at predetermined intervals in the front and rear and left and right directions.

1 to 12 show a reinforcement arrangement method for solid base shear reinforcement, which will be explained step by step below.

First, the lower end main reinforcing bars 3 are arranged in a grid pattern in multiple stages (see Figs. 1 to 6).

Subsequently, a plurality of lower shear reinforcing bars 5 are erected in a substantially circular shape on top of the lower end main bars 3 (see FIG. 7). In this case, the lower shear reinforcing bars 5 are fixed to the lower end main bars 3 by binding wires or welding.

Subsequently, a plurality of ring reinforcements 6 are arranged at regular intervals in the vertical direction on the rising portion of the lower shear reinforcing reinforcement 5 (see FIG. 8). The ring reinforcement 6 is fixed to the lower shear reinforcing reinforcement 5 by binding wire or welding.

Subsequently, the upper end main reinforcing bars 2 are arranged in a grid pattern and in multiple stages (see FIGS. 9 to 11).

Next, a plurality of upper shear reinforcing bars 4 are suspended from the upper main reinforcing bars 2, and their lower ends are inserted into the group of lower shear reinforcing bars 5 (see FIG. 12).

The upper shear reinforcing bars 4 and the upper end main reinforcing bars 2, and the upper shear reinforcing bars 4 and ring bars 6 are fixed by binding wires or welding.

In addition, when there is only one upper shear reinforcing bar 4, it is inserted into the center of the lower shear reinforcing bar 5 group.

Effects of the invention This invention has the above configuration and has the following effects.

At the bottom of the solid base shear reinforcement, multiple lower shear reinforcement bars are arranged in a bundle, and a 180° hook is formed at each base end, and furthermore, a lower shear reinforcement bar and an upper shear reinforcement bar are arranged in a bundle. Since multiple ring reinforcing bars are arranged in the overlapped part, the anchoring force and adhesion force to the concrete are greatly increased, and the shear reinforcement effect is extremely high.

In addition, since the lower shear reinforcing bars are made of small-diameter reinforcing bars, 180° hooks, which are extremely effective as anchoring parts, can be easily formed and are easy to process. Also, since the diameter is small, reinforcing work can be done extremely easily.

Furthermore, by using thin reinforcing bars, the overlapping length of reinforcing bars can be shortened and the amount of reinforcing bars can be saved.

[Brief explanation of the drawing]

FIGS. 1 to 12 are process diagrams showing a method for arranging solid base shear reinforcing bars. 1... Solid foundation, 2... Top main reinforcement, 3... Bottom main reinforcement, 4... Upper shear reinforcement, 5... Lower shear reinforcement, 6... Ring reinforcement, 7... 180° hook,
8...Overlapping part.

Claims (1)

[Scope of utility model registration request] An upper shear reinforcement bar and a plurality of small diameter lower shear reinforcement bars are arranged between the upper and lower main reinforcements of the solid foundation, extending in the opposite direction from the upper end main reinforcement and the lower end main reinforcement, and these upper shear reinforcement bars and lower shear reinforcement bars are arranged. A solid foundation characterized in that 180° hooks are provided at the base ends of the reinforcements, the upper shear reinforcing bars and the lower shear reinforcing bars are overlapped, and a plurality of ring reinforcements are arranged in this overlapped part. shear reinforcement.