JPS6321606Y2 - - 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 a frame consisting of steel-framed reinforced concrete columns and steel-framed reinforced concrete beams or steel beams, this panel zone is usually reinforced by sowing reinforcing bars at the construction site, but this construction is extremely complicated.

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

In other words, we considered a shear reinforcement structure in which L-shaped or U-shaped shear reinforcement bars were passed from both directions through through-holes provided in the beam web, and wedges were driven into the intersections, thereby making it possible to construct reinforcing bars in the panel zone. The aim was to significantly improve performance and provide reliable reinforcement.

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

Figure 2 is a perspective view schematically showing the location of the shear reinforcing bars used in this invention, Figure 3 is a longitudinal sectional view of the main part, and Figure 4 is an enlarged view of the main part. It is.

A through hole 5 is provided in the web of the steel beam 2 made of H-shaped steel, as shown in FIG. The holes pass through the holes and intersect at the 5 portions of the through holes. Although it is omitted in Fig. 2, this shear reinforcing bar is similar to a normal hoop bar.
It is arranged so as to surround the column main reinforcement 3. Then, a wedge 7 is driven between the wrapped shear reinforcing bars 6 from the outside toward the web through hole 5, and the shear reinforcing bars 6 are mechanically fixed.

Therefore, in construction, once the steel frame erection and the reinforcement of the main column reinforcement 3 are completed, L-shaped or U-shaped shear reinforcement 6 is passed through the through hole 5 in the web of the steel beam 2, and shear reinforcement reinforcement is inserted from both directions. This can be easily done by crossing the wedges 6 and then driving in the wedges 7.

By reinforcing the shear reinforcing bars 6 at appropriate pitches in the axial direction of the column, the entire panel zone can be reinforced.

Note that although the illustrated embodiment uses a cross-shaped cross-section as the column steel frame 1, the same applies if the column steel frame is an H-shaped steel.

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

Construction is very easy.

When embedded in concrete, the wedged shear reinforcement is well anchored and can withstand up to its breaking strength. Therefore, a reliable reinforcing effect can be obtained.

The shear reinforcement is anchored in the through-hole area and does not particularly impede the filling of concrete.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a conventional example, FIG. 2 is a perspective view of an embodiment of this invention, and FIG. 3 is a vertical cross-sectional view of the main parts. FIG. 4 is an enlarged view of the main part. 1... Column steel frame, 2... Steel beam, 3... Column main reinforcement,
4...Shear reinforcement, 5...Through hole, 6...Shear reinforcement, 7...Wedge.

Claims (1)

[Scope of utility model registration request] An L-shaped or U-shaped shear reinforcing bar is passed through a through hole provided in the beam web, intersected with a similar shear reinforcing bar placed from the opposite direction at the through hole, and wedges are inserted from both directions of this intersection. A reinforcement structure for a column-beam joint, characterized in that the driven shear reinforcing bars are fixed.