JPS6321607Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a shear reinforcement structure of a so-called panel zone, which is a column-beam joint in a composite structure such as a steel-frame reinforced concrete structure or a column-steel-reinforced-concrete-beam steel structure.

In the frame structure of a building, the panel zone surrounded by columns and beams is the part of the frame where stress is concentrated the most, and is a structurally extremely important part. In frames consisting of steel reinforced concrete columns and steel reinforced concrete beams or steel beams, this panel zone is normally reinforced with reinforcing bars at the construction site, but this construction is extremely complicated. be.

An example of a conventional reinforcement structure for such a column-beam joint is shown in FIG. 1. However, since reinforcement is placed through the web of the beam at the joint, the shape of the joint is limited to a simple shape for construction purposes.

For this reason, the current practice is to make sets of four L-shaped shear reinforcing bars, wrap each one by the overlapped length, and weld this part, or secure the anchoring length. However, although welding is effective as a reinforcing method, it is difficult to construct, while the method of securing the anchorage length is easy to construct, but has the disadvantage that it is not effective against protruding joints.

The column-beam joint reinforcement structure of this invention was devised to eliminate the drawbacks of the prior art as described above.

That is, L-shaped or U-shaped shear reinforcing bars with screwed or bent ends for locking were installed vertically alternately in through holes provided in the beam web, and fixed at the through holes. The reinforced structure significantly improved workability and reduced costs.

This invention will be explained below based on illustrated embodiments (FIGS. 2 to 4).

FIG. 2 is a perspective view schematically showing the position of the shear reinforcing bars 5 used in the embodiment of this invention.
It is fixed with a nut 6 through a through hole provided in the web. Figures 3a and 3b show the details, and the web of the steel beam 2 made of H-section steel is provided with through holes in advance for inserting the shear reinforcing bars 5. A shear reinforcing bar 5 bent into an L-shape or a U-shape is passed through the through hole and fixed with a nut 6.

Therefore, during construction, after erecting the steel frame and arranging the main column reinforcements 3, shear reinforcement bars 5 are placed in contact with the outside of the column main reinforcements 3, and shear reinforcement bars passed through the through holes of the steel beams 2 are placed. Reinforcement work is completed by simply tightening the ends of 5 with nuts 6. Then, by attaching such shear reinforcing bars 5 at appropriate pitches in the axial direction of the column so that the adjacent shear reinforcing bars 5 are vertically staggered,
The entire panel zone can be reinforced.

Further, FIGS. 4a and 4b show another embodiment, in which the ends of the shear reinforcing bars 7 are bent to form bent portions 8. Then, instead of tightening both ends with nuts, the bent portion 8 is locked and fixed in the through hole of the steel beam 2.

In addition, in these two examples, the column steel frame 1
Although we use a column with a cross-shaped cross section, it can also be used if the column steel frame is H-shaped steel.

This invention has the above configuration and has the following advantageous features.

Construction is very easy. That is, it is easy to fix the shear reinforcing bars to the web of the steel beam, and since the top and bottom are staggered, other shear reinforcing bars do not interfere with the work.

It does not require any fittings, and the material itself is inexpensive.

There are no problems such as protrusion of shear reinforcing bars, and the concrete fillability is good.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a conventional example. FIG. 2 is a perspective view showing an embodiment of this invention. FIG. 3a is a longitudinal sectional view of the main part. FIG. 3b is a perspective view of the shear reinforcement used. FIG. 4a is a vertical cross-sectional view of main parts in another embodiment. FIG. 4b is a perspective view of the shear reinforcement used. 1... Column steel frame, 2... Steel beam, 3... Column main reinforcement,
4...Shear reinforcement, 5...Shear reinforcement, 6...
... Nut, 7... Shear reinforcing bar, 8... Bent part.

Claims (1)

[Scope of utility model registration request] L with threaded or bent ends for locking
A reinforcing structure for a column-beam joint, characterized in that shear reinforcing bars in a shape of a letter or a U-shape are installed vertically alternately in through-holes provided in a beam web, and are fixed at the portions of the through-holes.