JPS6321604Y2 - - 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 composed of steel reinforced concrete columns and steel 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.

Therefore, at present, L-shaped shear reinforcing bars are made into a set of four, each lapped by an overlap length l, and this part is welded or secured by 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, we devised a device that combines long bolts and flat steel bent into an L-shape, and by using this we attempted to significantly improve the workability of reinforcing reinforcing bars in panel zones.

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

FIGS. 2 and 3 are a plan view and a perspective view of an embodiment of this invention, respectively, showing the state before concrete is poured. Steel frame of steel reinforced concrete column 1
Long bolts 5 are welded or fixed with nuts 7 in advance to the web part of the column, and after the steel frame erection and reinforcement work for columns and beams is completed, bolts are attached to the four corners of the column so as to circumscribe the main column reinforcement 3. Insert the L-shaped flat steel 6 into the long bolt 5 and fix it with a nut 9.

The entire panel zone can be reinforced by arranging reinforcement by such a combination of flat bars 6 and long bolts 5 at appropriate pitches in the axial direction of the column.

In addition, regarding fixing the long bolts 5, attach the column steel frame 1 in advance.
Possible methods include providing a through hole in the web and tightening the nut 7, or directly welding to the web.

Figure 4 shows the flat steel 6 and long bolt 5 used in this invention.
This figure shows the shape of . The hole 8 in the flat steel is made to be a hole slightly larger than the diameter of the long bolt 5 or an elliptical hole in consideration of workability.

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

Work at the construction site is as simple as fixing flat steel to long bolts with nuts, allowing for quick construction.

The long bolts work effectively against forces that push the flat steel apart, so they hold the concrete well.

The long bolts for attaching flat bars can also be used to secure formwork in the panel zone area, speeding up formwork construction.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view showing a conventional example, Figure 2 is a cross-sectional view showing an embodiment of this invention, Figure 3 is a perspective view of the main parts, and Figure 4 is a perspective view of steel materials used in this invention. It is. 1... Column steel frame, 2... Steel beam, 3... Column main reinforcement,
4... Shear reinforcement, 5... Long bolt, 6... Flat steel, 7... Nut, 8... Through hole, 9... Nut.

Claims (1)

[Scope of utility model registration request] A long bolt perpendicular to each web of a column steel frame having a cross-shaped web is fixed to each web, and a flat steel with an L-shaped cross section arranged at the corner of the column is attached to the end of the long bolt. A reinforced structure for column-beam joints featuring: