CN2390933Y - Square steel pipe concrete beam and column jointing gusset - Google Patents

Abstract

The connection node of reinforced concrete-filled square steel pipe beams and columns relates to the connection structure between square reinforced concrete columns and concrete-filled steel pipe beams. The wall of the square steel pipe is provided with small holes passing through the longitudinal reinforcement of the frame beam, the outer wall of the pipe wall is provided with horizontal steel bars or section steel, the outer periphery of the square steel pipe is provided with reinforced concrete ring beams, and the inside of the square steel pipe is provided with reinforcing steel bars. Because the welding workload is greatly reduced, especially the number of on-site welding, the utility model has the advantages of low cost, simple design, excellent mechanical properties and low construction difficulty. It can be widely used in the joints of column and beam components of various buildings.

Description

Connecting joints of reinforced square concrete filled steel pipe beams and columns

The utility model relates to the manufacturing technology of square steel pipe concrete columns and reinforced concrete beam joints.

Compared with traditional concrete columns, square steel pipe concrete columns not only bring convenience in construction because of their regular rectangular shape and the strength of square steel pipes, for example, square steel pipes can also be used as external formwork and temporary support of columns, saving materials and manual; the concrete construction in the column combined with the high-level dropping and no-vibration technology can construct several floors at a time, thereby speeding up the construction progress; it can better cooperate with the reverse construction method of the basement in high-rise buildings to obtain greater economic benefits; at the same time, the column can be The selection of internal and external concrete is completely separated from the construction, so that "well water does not interfere with river water", high-grade concrete is used inside the column, and low-grade concrete is used for the beams and slabs outside the column, which further reduces the cost. In addition, it also has the advantages of not being restricted by the reinforcement ratio, high bearing capacity, small cross-section of the column, light weight and less floor space. Especially because the square steel pipe has a large flexural and shear section, it bears the shear force in two directions during the horizontal earthquake, so that the internal concrete is less affected by the shear force, thereby improving the compressive shear capacity of the concrete. In conclusion, square concrete filled steel tube columns are better than traditional concrete columns in terms of mechanical properties such as ductility, strength and stiffness. Therefore, it has been widely used abroad, especially in Japan, a country with many earthquakes. With the increase of my country's steel production, square concrete-filled steel tube columns will also be widely popularized and applied in various places, especially in earthquake-prone areas.

However, so far, the connection form between the square concrete filled steel tube column and the beam has not been reasonably resolved. The connection between the existing square steel tube concrete column and the beam is solved by welding or bolt connection. Whether it is welded on the outside of the square steel pipe to make an outer reinforced plate type; or welded steel plates inside the square steel pipe to make an inner reinforced plate type; or welded steel plates inside and outside to make a through reinforced plate type, all rely on the outer wall of the steel pipe Steel girder ribs are welded or bolted to transmit shear and bending moments. There are inevitably a large number of welds in the above three forms, which affect the properties of the steel and are prone to brittle fractures; the on-site welding workload is large, the quality requirements are high, the construction conditions are poor, and the requirements for welding personnel are high. And the resulting In order to reduce the cost and increase the cost, it is only applicable to steel structure floors composed of steel beams or profiled steel plates. In the foreseeable future in our country, the reinforced concrete floor system will be the most widely used.

The purpose of the utility model is to provide a connection node between a square steel tube concrete column and a reinforced concrete beam with low cost, good mechanical properties, simple and convenient design, and low construction difficulty.

In order to achieve the above object, the utility model is achieved through the following schemes. There are small holes on the wall of the square steel pipe at the connection between the square steel pipe concrete column and the frame beam, and the longitudinal reinforcement of the frame beam is pierced in the small hole, and the longitudinal reinforcement passes through the square steel pipe to transmit the bending moment; the outer circumference of the steel pipe is provided with a ring beam for Transmit the shear force at the end of the beam; the outer wall of the square steel pipe at the connection is provided with shear-resistant horizontal reinforcement or section steel, so that most of the shear force at the beam end of the frame beam passes through the ring beam and the shear reinforcement ring or section steel in a purely shearing manner It is transmitted to the wall of the steel pipe; the pipe wall of the square steel pipe is provided with vertical reinforcing steel bars, so that the small holes of the pipe wall of the other steel pipe can be reinforced.

The utility model has the advantages of:

1. Since the welding workload is greatly reduced, especially the number of on-site welding, the strength and ductility of the connection point are improved, and the brittle fracture caused by welding at the connection point under strong earthquakes is reduced, so that the mechanical properties of the utility model are excellent. It is higher than the existing square steel pipe beam-column structure, and also higher than the existing reinforced concrete structure.

2. In addition to the square steel pipe, the force flow transmission of each part of the connection point utilizes existing materials, namely steel bars and concrete, thus saving the consumption of section steel and steel plates, making the cost of the utility model lower than that of the existing steel pipe beam-column structure , only comparable to the cost of existing reinforced concrete.

3. Since the shear force transmission at the beam end is carried out through the ring beam and the shear steel bar or section steel provided on the outer wall of the steel pipe, the utility model has safe and reliable force transmission measures, clear and concise force transmission path, simple design and convenient construction.

Accompanying drawing is an embodiment of the utility model

Fig. 1 is the schematic diagram of the plane structure of the utility model

Figure 2 is a schematic diagram of the planar structure of the ring beam of the present utility model

Fig. 3. is the I-I schematic diagram of the utility model

Fig. 4. is II-II schematic diagram of the utility model

Fig. 5. is III-III schematic diagram of the utility model

Fig. 6. is the enlarged schematic diagram of point A of the shear reinforcement of the utility model

Figure 7 is an enlarged schematic diagram of the small hole B in the steel pipe wall of the present utility model

The utility model is further described in conjunction with the accompanying drawings

The utility model is composed of a square steel pipe (1), a small hole (2), a ring beam (3), a longitudinal bar (4), concrete (5), a reinforcing steel bar (6), a pipe section weld liner (7), It consists of a shear reinforcement weld (8) and a shear reinforcement ring (9). According to the design of a section of square steel pipe (1) on each floor, the small hole (2) for passing through the longitudinal reinforcement (4) of the frame beam is pre-drilled on the pipe wall of the square steel pipe (1) at the height of the node, and then the On the outer pipe wall of the square steel pipe (1) at place, weld a shear reinforcement ring (9) with the shear reinforcement weld seam (8), and then each side of the small hole (2) in the pipe wall of the square steel pipe (1) Set a reinforcing steel bar (6) and spot weld it on the weld liner (7), hoist the processed square steel pipe (1) in place, connect it to the previous section of square steel pipe (1), and weld Fix it, and then proceed to formwork fabrication of the frame beam and ring beam, and finally hoist the steel cage of the ring beam (3) on the formwork at the connection node, and insert the longitudinal reinforcement (4) of the frame beam into the small hole In (2), carry out the construction of the reinforced formwork of floor, and carry out the construction project of concrete (5) outside the tube wall of square steel pipe (1) and floor place.

Claims (1)

1. Reinforcement type square steel pipe concrete beam and column connection node is characterized in that: the outer wall of the square steel pipe (1) at the beam-column connection is provided with horizontal reinforcement or section steel (9), and the outer circumference of the square steel pipe (1) A reinforced concrete ring beam (3) is provided, and the wall of the square steel pipe (1) is also provided with a small hole (2) for the frame beam longitudinal reinforcement (4) of the ring beam (3), and the pipe wall of the square steel pipe (1) Reinforcing steel bars (6) are arranged inside.

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