A lattice steel-concrete composite column-beam-column node

Abstract

A lattice steel-concrete composite column-beam-column node comprises a lattice steel column with a steel corbel, a prestressed composite beam and a node reinforced concrete. The lattice steel column comprises a lattice steel frame and a steel corbel, the steel corbel is composed of an upper horizontal tie rod, a diagonal brace rod and a lower horizontal compression rod, the upper horizontal tie rod and the lower horizontal compression rod are welded between adjacent limb columns, a resting rod is welded between adjacent upper horizontal tie rods, the end of the prestressed composite beam is rested on the resting rod, the exposed steel strand of the prestressed composite beam extends into the core area of ​​the node reinforced concrete, and the lattice steel frame column with a steel corbel, the prestressed composite beam and the node reinforced concrete are integrally cast. The node solves the problem of resting the upper beam when multiple layers of prefabricated beams are hoisted simultaneously, reduces the amount of steel used, and improves the compression and shear resistance of the node.

Description

Technical Field

[0001] The invention relates to the field of building (structure) construction, and in particular to a lattice steel-framed concrete composite column beam-column node form for solving the problem of simultaneous lifting and shelving of multi-layer prefabricated beams. Background Art

[0002] The prefabricated beams of prefabricated large-span multi-story building projects are usually hoisted in layers, which has high crane costs and slow construction progress. Prefabricated beams with larger spans need large-tonnage cranes due to their heavy weight. However, large-tonnage cranes cannot be used due to the design bearing capacity of the floor, resulting in the inability to hoist the prefabricated beams of multi-story building projects. Therefore, multi-story hoisting is required. This construction method needs to solve the problem of shelving the upper beams during the construction stage. A lattice steel-framed concrete column beam-column node with large beam-column node corbel bearing capacity and good mechanical properties after casting has not been reported. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a lattice steel frame concrete column beam-column node with large corbel bearing capacity and good mechanical properties after casting.

[0004] A lattice steel-concrete composite column-beam-column node provided by the present invention comprises a lattice steel column with a steel corbel, a prestressed composite beam and a node reinforced concrete. The lattice steel column comprises a lattice steel skeleton and a steel corbel. The steel corbel consists of an upper horizontal tie rod, a diagonal brace rod and a lower horizontal compression rod. The upper horizontal tie rod and the lower horizontal compression rod are welded between adjacent limb columns. A resting rod is welded between adjacent upper horizontal tie rods. The end of the prestressed composite beam is rested on the steel corbel resting rod. The exposed steel strands of the prestressed composite beam extend into the core area of ​​the node reinforced concrete. The lattice steel skeleton column with a steel corbel, the prestressed composite beam and the node reinforced concrete are cast as a whole.

[0005] The lattice steel-concrete composite column-beam-column node provided by the present invention also has the following auxiliary technical features:

[0006] The end of the prestressed composite beam is more than 150 mm away from the limb column.

[0007] A heightened portal steel frame is welded to the cantilevered end of a portion of the upper horizontal tie rods, a horizontal tie piece is provided on the upper portion of the heightened portal steel frame to connect with the lattice steel skeleton, and a portion of the ends of the prestressed composite beams are placed on the heightened portal steel frame.

[0008] The web members in the reinforced concrete of the node are rear-connected, and the connection method is welding or bolt connection.

[0009] The lattice steel frame penetrates into the node reinforced concrete for a certain length, and the web members in the node reinforced concrete are rear-connected, and the connection method is welding or bolt connection.

[0010] The node reinforced concrete comprises steel bars and concrete, the steel bars comprise main bars, stirrups and corbel bars, and the main bars are arranged at a certain distance along the outer side of the web members of the lattice steel skeleton.

[0011] The lattice steel frame is composed of steel pipe limbs and webs located at four corners, and high-strength concrete is poured into the steel pipes.

[0012] The lattice steel-concrete composite column-beam-column node provided by the present invention has the following advantages compared with the prior art:

[0013] 1. When using steel brackets to place prefabricated beams for simultaneous lifting of multiple layers, the construction progress is fast and the lifting cost is low.

[0014] 2. Steel corbels are used as prefabricated beam support structures and as compression and shear resistant components after concrete pouring. The amount of steel used is small, but the compression and shear resistance are improved.

[0015] 3. The cross-section of the node is enlarged after combination, which fully reflects the design principle of "strong node, weak component" and improves the seismic performance of the node.

[0016] 4. The precast beam is more than 150mm away from the limb column to ensure that the steel strands used as the main reinforcement of the precast beam are bent and extended into the core area of ​​the node during installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a stereogram of the present invention.

[0018] Figure 2 It is a three-dimensional diagram of the lattice steel column of the present invention.

[0019] Figure 3 It is a schematic diagram of the node steel bar connection of the present invention.

[0020] Figure 4 It is a schematic diagram of the elevation structure of the present invention.

[0021] Figure 5 This is a rendering of the node after pouring of the present invention. DETAILED DESCRIPTION

[0022] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0023] See also Figures 1 to 5 In an embodiment of a lattice steel-concrete composite column-beam-column node provided by the present invention, the lattice steel column 1 with a steel corbel 11, a prestressed composite beam 2 and a node reinforced concrete 3 are included, the lattice steel column 1 includes a lattice steel skeleton 12 and a steel corbel 11, the steel corbel 11 is composed of an upper horizontal tie rod 111, a diagonal brace rod 112 and a lower horizontal compression rod 113, the upper horizontal tie rod 111 and the lower horizontal compression rod 113 are welded between adjacent limb columns, and a resting rod 114 is welded between adjacent upper horizontal tie rods 111, the end of the prestressed composite beam main beam 2 is rested on the resting rod of the steel corbel 11, the exposed steel strand 21 of the prestressed composite beam 2 extends into the core area of ​​the node reinforced concrete 3, and the lattice steel skeleton column 1 with a steel corbel 11, the prestressed composite beam 2 and the node reinforced concrete 3 are cast as a whole. When using steel brackets 11 to place prefabricated beams for simultaneous lifting of multiple layers, the construction progress is fast and the lifting cost is low. At the same time, after being poured with concrete, it can be used as a compression and shear resistance component. The steel strands of the prestressed composite beam 2 extend into the core area of ​​the node reinforced concrete 3 to improve the overall performance of the beam-column node.

[0024] See also Figure 1 , Figure 2 In an embodiment of a lattice steel-reinforced concrete composite column-beam-column node provided by the present invention, the end of the prestressed composite beam 2 is more than 150 mm away from the limb column. This distance ensures that the steel strand can be smoothly placed in the node when the prefabricated beam is installed, thereby improving construction efficiency.

[0025] See also Figure 1 , Figure 2 In an embodiment of a lattice steel-concrete composite column-beam-column node provided by the present invention, a heightened portal steel frame 115 is welded to the cantilevered end of part of the upper horizontal tie rod 111, a horizontal tie piece 116 is provided on the upper part of the heightened portal steel frame 115 to connect with the lattice steel skeleton 12, and a part of the end of the prestressed composite beam 2 is placed on the heightened portal steel frame 115. The height specifications of the primary and secondary beams of the prestressed composite beam 2 are different, so a heightened portal steel frame 115 is provided to adjust the placement height of the secondary beam, and the horizontal tie piece 115 is conducive to improving the stability of the heightened portal steel frame 115. Preferably, the upper horizontal tie rod 111 provided with the heightened portal steel frame 115 is not provided with a placement rod 114.

[0026] See also Figures 1 to 4 In an embodiment of a lattice steel-reinforced concrete composite column-beam-column node provided by the present invention, the web member 17 in the node reinforced concrete 3 is post-connected, and the connection method is welding or bolt connection. The post-connection method is conducive to the hoisting construction of the prestressed composite beam 2 and facilitates the steel strand 21 to penetrate the core area of ​​the node reinforced concrete 3.

[0027] See also Figures 3 to 5In an embodiment of a lattice steel-concrete composite column-beam-column node provided by the present invention, the node reinforced concrete 3 includes steel bars 32 and concrete 31, the steel bars include main bars 321, stirrups 322 and corbels 323, and the main bars 321 are arranged at a certain distance along the outer side of the web members of the lattice steel skeleton 12. The vertical main bars 321 bear compression and bending resistance, and the stirrups 322 and corbels 323 constrain the concrete while meeting the shear resistance requirements.

[0028] See also Figure 2 In an embodiment of a lattice steel-concrete composite column-beam-column node provided by the present invention, the lattice steel skeleton 12 is composed of steel tube limbs 121 and web members 122 located at four corners, and high-strength concrete 123 is poured into the steel tubes. Pouring high-strength concrete 123 further improves the strength and rigidity of the lattice steel skeleton 12, so that the hoisting bearing capacity requirements can be met even without pouring column concrete.

[0029] In the present invention, all "certain distances" refer to the length necessary to meet the design requirements, that is, the length required to meet the connection and strength requirements. This length is clear to ordinary technicians in this field and can be set as needed.

Claims

1. A lattice steel-concrete composite column-beam-column node, comprising a lattice steel column with a steel corbel, a prestressed composite beam and a node reinforced concrete, characterized in that: The lattice steel column includes a lattice steel frame and steel corbels. The lattice steel frame is composed of steel tube limbs and webs located at four corners. High-strength concrete is poured into the steel tube limbs. The steel corbels are composed of upper horizontal tie rods, diagonal braces and lower horizontal compression rods. The upper horizontal tie rods and the lower horizontal compression rods are welded between adjacent steel tube limbs. A resting rod is welded between adjacent upper horizontal tie rods. The ends of the prestressed composite beams are rested on the resting rods. Multiple layers of steel corbels are arranged on the lattice steel frame. The prestressed composite beams are rested by the steel corbels to carry out multi-layer simultaneous lifting. The exposed steel strands of the prestressed composite beams extend into the core area of ​​the node reinforced concrete. The lattice steel frame column with steel corbels, the prestressed composite beams and the node reinforced concrete are cast as a whole.

2. The lattice steel-concrete composite column-beam-column node according to claim 1 is characterized in that The end of the prestressed composite beam is more than 150 mm away from the steel pipe limb column.

3. The lattice steel-concrete composite column-beam-column node according to claim 1 is characterized in that A heightened portal steel frame is welded to the cantilevered end of a portion of the upper horizontal tie rods, a horizontal tie piece is provided on the upper portion of the heightened portal steel frame to connect with the lattice steel skeleton, and a portion of the ends of the prestressed composite beams are placed on the heightened portal steel frame.

4. The lattice steel-concrete composite column-beam-column node according to claim 1 is characterized in that The web members in the reinforced concrete of the node are rear-connected, and the connection method is welding or bolt connection.

5. The lattice steel-concrete composite column-beam-column node according to claim 1 is characterized in that The node reinforced concrete comprises steel bars and concrete, the steel bars comprise main bars, stirrups and corbel bars, and the main bars are arranged at a certain distance along the outer side of the web members of the lattice steel skeleton.

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