A prestressed steel shear frame for plate-column structure

Abstract

The invention discloses a prestressed steel shear frame for a plate-column structure, comprising: a plurality of parallel X-shaped steel pipes arranged at the junction of beam-column reinforcement and plate-strip reinforcement, and a plurality of parallel Y-shaped steel pipes arranged below the X-shaped steel pipes, and any X-shaped steel pipe is perpendicular to any Y-shaped steel pipe; an X-shaped corrugated pipe is inserted in the X-shaped steel pipe, and a Y-shaped corrugated pipe is inserted in the Y-shaped steel pipe. The invention is suitable for the technical field of plate-column structure design, and by arranging the prestressed steel shear frame and fixing it at the plate-column node through the column reinforcement, not only can the corrugated pipe or prestressed reinforcement be ensured to pass smoothly, the difficulty of prestressed construction is reduced, the construction quality is improved, and the accuracy of prestressed sagittal height is improved, and at the same time, the steel shear frame can be used to participate in the plate-column anti-punching shear calculation, replace part of the shear reinforcement and stirrups, so that the anti-punching capacity of the plate-column node is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of plate-column structure design, in particular to a prestressed steel shear frame used for a plate-column structure. Background Art

[0002] The design of bending and shearing resistance reinforcement at the slab-column joint is the focus of slab-column structure design. Generally, the bending and shearing resistance of the slab is enhanced by adding support plates or column caps. Usually, in large-span or heavy-loaded slab-column structures, prestressed tendons need to be laid in the slab strips on the bidirectional columns. Therefore, a large number of bending and shearing steel bars and prestressed tendons must be configured at the slab-column joints of the prestressed slab-column structure. During construction, not only are the steel bars densely packed here, making it difficult to construct, but also the phenomenon that the bonded prestressed corrugated pipe cannot pass smoothly is often encountered, and a large number of stirrups need to be cut off, which weakens the slab's shearing resistance. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a prestressed steel shear frame for a plate-column structure.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A prestressed steel shear frame for a plate-column structure, comprising: a plurality of parallel X-shaped steel pipes arranged at the junction of beam-column steel bars and plate-strip steel bars, and a plurality of parallel Y-shaped steel pipes arranged below the X-shaped steel pipes, wherein any X-shaped steel pipe is perpendicular to any Y-shaped steel pipe;

[0006] The X-direction corrugated pipe is inserted into the X-direction steel pipe, and the Y-direction corrugated pipe is inserted into the Y-direction steel pipe.

[0007] Preferably, the connecting surfaces of the X-shaped steel pipe and the Y-shaped steel pipe are fixed by welding.

[0008] Preferably, gaps are formed between the X-shaped steel pipe and the X-shaped corrugated pipe therein, and between the Y-shaped steel pipe and the Y-shaped corrugated pipe therein.

[0009] Preferably, the tops of the X-shaped steel pipe and the Y-shaped steel pipe are both provided with casting holes, which are used for cement slurry to flow into the gaps during concrete casting and vibration.

[0010] Preferably, a plurality of shear bolts are welded to the bottom of the X-shaped steel pipe and the Y-shaped steel pipe.

[0011] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0012] In the present invention, by setting a prestressed steel shear frame and fixing it at the slab-column node through column reinforcement, not only can the corrugated pipe or prestressed reinforcement pass smoothly, the difficulty of prestressing construction is reduced, the construction quality is improved, and the accuracy of prestressing sagittal is improved. At the same time, the steel shear frame can be used to participate in the shear resistance calculation of the slab-column, replacing part of the shear reinforcement and stirrups, so that the shear resistance capacity of the slab-column node is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the installation structure of a prestressed steel shear frame used in a slab-column structure in the slab-column node steel bar of the present invention;

[0014] Figure 2 It is a top view of an installation structure of a prestressed steel shear frame for a slab-column structure in a slab-column node steel bar according to the present invention;

[0015] Figure 3 It is a schematic diagram of the overall structure of a prestressed steel shear frame for a plate-column structure according to the present invention;

[0016] Figure 4 The present invention is a schematic diagram of a structure in which a corrugated pipe in a prestressed steel shear frame for a plate-column structure passes through a prestressed steel shear frame.

[0017] Figure numerals: 1. X-shaped steel pipe; 2. X-shaped corrugated pipe; 3. Y-shaped steel pipe; 4. Y-shaped corrugated pipe; 5. Beam-column reinforcement; 6. Plate-strip reinforcement; 7. Casting hole; 8. Shear bolt; 9. Connection surface. DETAILED DESCRIPTION

[0018] The following is combined with Figure 1-4 , further illustrating a specific implementation of a prestressed steel shear frame for a plate-column structure of the present invention. A prestressed steel shear frame for a plate-column structure of the present invention is not limited to the description of the following embodiments.

[0019] Embodiment 1:

[0020] This embodiment provides a specific implementation method of a prestressed steel shear frame for a plate-column structure. Figure 1-4 As shown, it includes: a plurality of parallel X-shaped steel pipes 1 arranged at the junction of the beam-column steel bars 5 and the plate strip steel bars 6, and a plurality of parallel Y-shaped steel pipes 3 arranged therebelow, and any X-shaped steel pipe 1 is perpendicular to any Y-shaped steel pipe 3;

[0021] An X-direction corrugated tube 2 is inserted into the X-direction steel tube 1 , and a Y-direction corrugated tube 4 is inserted into the Y-direction steel tube 3 .

[0022] Furthermore, the connection surface 9 between the X-shaped steel pipe 1 and the Y-shaped steel pipe 3 is fixed by welding.

[0023] Furthermore, gaps are formed between the X-shaped steel pipe 1 and the X-shaped corrugated pipe 2 therein, and between the Y-shaped steel pipe 3 and the Y-shaped corrugated pipe 4 therein.

[0024] Furthermore, a pouring hole 7 is provided at the top of the X-shaped steel pipe 1 and the Y-shaped steel pipe 3 for cement slurry to flow into the gap during concrete pouring and vibration.

[0025] Furthermore, a plurality of shear studs 8 are welded to the bottom of the X-shaped steel pipe 1 and the Y-shaped steel pipe 3 .

[0026] Working principle: Figure 1-4 As shown, before the construction of ordinary reinforcement at the prestressed slab-column node, the prestressed steel shear frame is pre-fixed in the column reinforcement according to the sagittal position of the prestressed reinforcement, and spot welded to the column reinforcement to form a prestressed corrugated tube or unbonded prestressed reinforcement channel that ensures the designed sagittal height, and then the ordinary reinforcement is laid.

[0027] Prestressed steel shear frames are made of thin-walled steel pipes welded in the factory according to the design drawings. The number of prestressed steel shear frames is determined according to the number of prestressed corrugated pipes or the number of unbonded and retarded prestressed tendons in the drawings. When the prestressed corrugated pipes or prestressed tendons are arranged in one direction, a one-way prestressed steel shear frame can be made. When the prestressed steel is arranged in a two-way cross-arrangement, a two-way prestressed steel shear frame can be made. The cross-sectional size of the thin-walled steel pipe should be determined according to the size of the prestressed flat corrugated pipe or the number of unbonded and retarded prestressed tendons and the results of the shear resistance calculation.

[0028] The number and cross-sectional dimensions of the shear studs 8 can be determined according to the calculation formula for the punching shear resistance of the slab-column structure in the concrete design specification. The shear studs 8 are placed downward and welded to the thin-walled steel pipe.

[0029] The prestressed steel shear frame is provided with the pouring hole 7 above and below, so that cement slurry can flow into the gap between the prestressed steel shear frame and the corrugated pipe when the concrete is poured and vibrated, thereby preventing the formation of a cavity.

[0030] The length of the prestressed steel shear frame is calculated according to the shear resistance formula, usually about 2 to 3 meters, and both ends must extend at least 50 cm away from the column edge.

[0031] Prestressed steel shear frames open up prestressed channels for node areas with dense steel bars. When laying flat corrugated pipes or unbonded slow-bonded prestressed bars, they only need to pass through the steel pipes of the steel shear frames. This not only ensures that the prestressed laying meets the design sagittal requirements and speeds up the construction progress, but also greatly improves the punching resistance of the slab-column node and reduces the amount of shear steel bars used.

[0032] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A prestressed steel shear frame for a plate-column structure, characterized in that: include: A plurality of parallel X-shaped steel pipes (1) are arranged at the junction of the beam-column steel bars (5) and the plate strip steel bars (6), and a plurality of parallel Y-shaped steel pipes (3) are arranged below the X-shaped steel pipes (1) and any Y-shaped steel pipe (3) are perpendicular to each other; The X-shaped steel pipe (1) is provided with an X-shaped corrugated pipe (2) inserted therein, and the Y-shaped steel pipe (3) is provided with a Y-shaped corrugated pipe (4) inserted therein; The connection surface (9) between the X-shaped steel pipe (1) and the Y-shaped steel pipe (3) is fixed by welding; Gaps are formed between the X-shaped steel pipe (1) and the X-shaped corrugated pipe (2) therein, and between the Y-shaped steel pipe (3) and the Y-shaped corrugated pipe (4) therein; The tops of the X-shaped steel pipe (1) and the Y-shaped steel pipe (3) are both provided with pouring holes (7) for cement slurry to flow into the gaps during concrete pouring and vibration.

2. A prestressed steel shear frame for a plate-column structure according to claim 1, characterized in that: A plurality of shear bolts (8) are welded to the bottom of the X-shaped steel pipe (1) and the Y-shaped steel pipe (3).

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