Prefabricated column of steel-concrete composite structure

Abstract

The invention relates to the technical field of fabricated building structures, in particular to a steel-concrete composite structure prefabricated column. The steel-concrete composite structure prefabricated column comprises a column top connecting joint assembly, a reinforced concrete column body and a column foot connecting joint assembly, the reinforced concrete column body comprises a steel bar frame and a concrete layer formed through pouring, and the steel bar frame comprises column body longitudinal bars and column body stirrups; the column top connecting joint assembly comprises a column top frame and a concrete layer formed through pouring. The column top frame comprises a structural pipe, a beam column connecting joint plate and a column top connecting plate. The column foot connecting joint assembly comprises a column foot frame and a concrete layer formed through pouring, and the column foot frame comprises a core column, a column bottom connecting plate and a pressure-bearing bottom plate. According to the reinforced concrete composite structure prefabricated column, by optimizing the collaborative design of the steel structure joint assembly and the reinforced concrete body, it is ensured that the steel joints form an effective complete stress mode, field dry type connection is achieved, and therefore the construction efficiency is remarkably improved, carbon emission is reduced, and the requirements of green buildings are met.

Description

Technical Field

[0001] The present invention relates to the technical field of assembled building structures, and in particular to a prefabricated column of a steel-concrete composite structure. Background Art

[0002] With the development of prefabricated building technology, prefabricated columns, as vertical load-bearing components, their structural performance and construction efficiency directly affect the overall quality of the building.

[0003] In the existing technology, traditional reinforced concrete precast columns have problems such as complex connection node construction (requiring on-site wet operations such as tying steel bars and pouring concrete), difficulty in ensuring node installation quality, and large amounts of construction waste; pure steel structure precast columns have defects such as high cost, poor fire resistance, and high subsequent maintenance costs.

[0004] In the field of steel-concrete composite structures, although existing technologies have attempted to combine the advantages of reinforced concrete bodies and steel structure nodes, the connection design between steel structure nodes and concrete bodies in some solutions is not optimized enough, resulting in insufficient collaborative performance between the two, and it is difficult to fully guarantee the bearing capacity and overall stability of the nodes. At the same time, some connection nodes still rely on on-site wet operations or complex assembly processes, failing to fully achieve the goal of efficient and low-carbon construction.

[0005] Therefore, there is an urgent need for a column structure that is streamlined and meets the requirements of prefabricated buildings for efficiency, environmental protection, and reliability. Summary of the Invention

[0006] The present invention aims to provide a prefabricated steel-concrete composite column structure, comprising a column top connection node assembly, a reinforced concrete column body, and a column foot connection node assembly. This prefabricated steel-concrete composite column, with reinforced concrete as the main body and steel structure as the node, optimizes the connection structure between the node and the main body, retaining the convenient connection characteristics of the steel structure node while leveraging the economic and durable advantages of the concrete structure. Furthermore, it achieves dry construction throughout the entire process, meeting the requirements of prefabricated buildings for high efficiency, environmental protection, and reliability. The specific technical solution is as follows: A prefabricated column of a steel-concrete composite structure, comprising a column top connection node assembly, a reinforced concrete column body, and a column foot connection node assembly; The reinforced concrete column body includes a steel frame and a poured concrete layer, wherein the steel frame includes a plurality of column longitudinal bars and a plurality of column stirrups arranged on the column longitudinal bars; The column top connection node assembly includes a column top frame and a poured concrete layer. The column top frame includes a structural tube and a beam-column connection node plate and a column top connection plate arranged on the structural tube. The structural tube is connected to the upper end of the steel frame. The beam-column connection node plate is used to connect the prefabricated columns and beam structures of the steel-concrete composite structure. The column top connection plate is used to connect the prefabricated columns and wall panels of the steel-concrete composite structure. The column base connection node assembly includes a column base frame and a cast concrete layer. The column base frame includes a core column and a column bottom connection plate and a pressure-bearing bottom plate arranged on the core column. The core column is connected to the lower end of the steel frame; the column bottom connection plate is used to connect the prefabricated columns and wall panels of the steel-concrete composite structure; the pressure-bearing bottom plate is used to connect the prefabricated columns of the steel-concrete composite structure and the structural members located thereunder.

[0007] Preferably, the column top connection node assembly further includes a stiffening plate, the structural tube is a hollow steel tube, and a plurality of stiffening plates are welded inside the hollow steel tube.

[0008] Preferably, the upper ends of the column longitudinal reinforcements are welded to the inner wall of the hollow steel tube, and the lower ends of the column longitudinal reinforcements are welded to the outer wall of the core column.

[0009] Preferably, the column base connection node assembly further comprises anchor bolt support stiffening ribs and core column combined stiffening ribs, and the interior of the core column is welded with the anchor bolt support stiffening ribs and the core column combined stiffening ribs.

[0010] Preferably, a plurality of groups of bolts are welded on the outer wall of the core column.

[0011] Preferably, the pressure-bearing base plate is fixedly connected to the structural member located below the prefabricated column of the steel-concrete composite structure by means of anchor bolts pre-buried in the structural member in combination with adjusting nuts.

[0012] Preferably, the column top connecting plate and the column bottom connecting plate both adopt a pin connection node connection method to achieve the connection between the prefabricated columns and wall panels of the steel-concrete composite structure.

[0013] The steel-concrete composite structure prefabricated column of the present invention includes a column top connection node assembly, a reinforced concrete column body, and a column base connection node assembly. The reinforced concrete column body includes a steel frame and a cast concrete layer, and the steel frame includes column longitudinal bars and column stirrups. The column top connection node assembly includes a column top frame and a cast concrete layer, and the column top frame includes a structural tube and a beam-column connection node plate and a column top connection plate arranged on the structural tube. The column base connection node assembly includes a column base frame and a cast concrete layer, and the column base frame includes a core column and a column base connection plate and a pressure-bearing bottom plate arranged on the core column. The steel-concrete composite structure prefabricated column optimizes the coordinated design of the steel structure node assembly and the reinforced concrete body to ensure that the steel node forms an effective complete stress mode and realizes on-site dry connection, thereby significantly improving construction efficiency, reducing carbon emissions, and meeting the needs of green buildings.

[0014] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings: Figure 1 Schematic diagram of a steel-concrete composite prefabricated column in a preferred embodiment of the present invention; Figure 2 This is a schematic diagram of the reinforcement of steel-concrete composite precast columns; Figure 3 It is a structural diagram of the column top connection assembly; Figure 4 It is a structural diagram of the column top connection assembly; Figure 5 It is a structural diagram of the column foot connection assembly; Figure 6 It is a structural diagram of the column foot connection assembly; Figure 7 This is a schematic diagram of the column foot connection method; Among them, 1. Column top connection node assembly, 101. Structural tube, 102. Stiffening plate, 103. Beam-column connection node plate, 104. Column top connection plate; 2. Reinforced concrete column body, 201. Installation hand hole, 202. Column longitudinal reinforcement, 203. Column stirrups; 3. Column foot connection node assembly, 301. Core column, 302. Column bottom connection plate, 303. Pressure-bearing bottom plate, 304. Anchor bolt supporting stiffening rib, 305. Core column combined stiffening rib, 306. Stud, 307. Anchor bolt, 308. Adjusting nut. DETAILED DESCRIPTION

[0016] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims.

[0017] Example: See also Figure 1-Figure 7 A prefabricated column of a steel-concrete composite structure includes a column top connection node component 1, a reinforced concrete column body 2, and a column foot connection node component 3, as follows: The column top connection node assembly 1 is shown in detail. Figure 2 and Figure 4 It includes a column top frame and a poured concrete layer. The column top frame includes a structural tube 101 and a beam-column connection node plate 103 and a column top connection plate 104 arranged on the structural tube 101. The structural tube 101 is connected to the upper end of the steel frame; the beam-column connection node plate 103 is used to connect the prefabricated columns and beam structures of the steel-concrete composite structure, and the column top connection plate 104 is used to connect the prefabricated columns and wall panels of the steel-concrete composite structure.

[0018] In this embodiment, preferably, the column top connection node assembly 1 also includes a stiffening plate 102, and the structural tube 101 is preferably a square hollow steel tube, and the material is usually Q355B or higher strength grade structural steel. Several stiffening plates 102 are welded inside, and the material is the same as the steel pipe or slightly lower (such as Q235B). The stiffening plate 102 is also provided with several through holes to meet the needs of concrete pouring and steel bar passage. The positioning and size of the holes can be adjusted according to the actual reinforcement conditions of the prefabricated column. The beam-column connection node plate 103 and the column top connection plate 104 are used to connect beams and wall panels, and the material is consistent with the steel pipe. The surface of all steel components should be derusted and painted with anti-corrosion paint (such as epoxy zinc-rich primer + epoxy micaceous iron intermediate paint + polyurethane topcoat).

[0019] The reinforced concrete column body 2 includes a steel frame and a poured concrete layer. The steel frame includes a plurality of column longitudinal bars 202 and a plurality of column stirrups 203 arranged on the column longitudinal bars 202. Figure 2 . In this embodiment, preferably, concrete with a temperature not lower than C40 is used for pouring. The steel frame includes longitudinal stress-bearing steel bars (column longitudinal bars 202) and a plurality of stirrups (i.e., column stirrups 203) arranged along the height direction of the column longitudinal bars. The longitudinal stress-bearing steel bars usually adopt HRB400 grade or higher ribbed steel bars, and the diameter is determined according to structural calculations (for example, Φ20~Φ25mm). The column stirrups adopt HPB300 or HRB400 grade steel bars, and the diameter is generally not less than Φ8mm. The spacing and form (such as ordinary stirrups, composite stirrups) are configured according to seismic and structural requirements. The reinforced concrete column body 2 is equipped with several operating holes () at the column root position to cooperate with the column foot connection node assembly 3 for the installation of the anchor bolts 307.

[0020] The column foot connection node component 3 is detailed in Figure 5 and Figure 6 The column base frame comprises a cast concrete layer. The column base frame includes a core column 301, a column base connection plate 302, and a pressure base plate 303 disposed on the core column 301. The core column 301 is connected to the lower end of the steel frame. The column base connection plate 302 is used to connect the precast steel-concrete composite structure column and the wall panel. The pressure base plate 303 is used to connect the precast steel-concrete composite structure column to the structural components below it. Preferably, the core column 301 is a square steel tube core column made of the same material as the structural tube 101. The pressure base plate 303 is welded to the bottom, with a thickness determined based on force calculations (e.g., 20-40 mm).

[0021] In this embodiment, preferably, a number of holes are opened on the side wall of the square steel tube core column (i.e., core column 301) to meet the uniformity and density requirements of concrete pouring. The position and size of the holes can be adjusted according to the actual reinforcement conditions of the prefabricated column. At the same time, in order to compensate for the loss of component strength and stability caused by the opening of the holes, a core column composite stiffening rib 305 is set in the square steel tube core column, and the core column composite stiffening rib 305 is also provided with holes for concrete circulation. The column base connection node assembly 3 also includes anchor bolt support stiffening ribs 304. Anchor bolt support stiffening ribs 304 (preferably a cross-shaped structure) are welded inside the core column 301. The core column composite stiffening ribs 305 and the anchor bolt support stiffening ribs 304 are made of the same material as the steel pipe. A plurality of groups of bolts 306 are also welded on the outer wall of the core column 301. See for details. Figure 6 The specifications of the studs (such as Φ19×80mm) and the spacing are determined according to the shear connection requirements. The pressure base plate 303 is fixedly connected to the structural member located below the prefabricated column of the steel-concrete composite structure through the anchor bolts 307 and adjusting nuts 308 embedded in the structural member. Figure 7 The surface treatment requirements of the column base connection node component 3 are the same as those of the column top connection node component 1.

[0022] In this embodiment, the upper end of the column longitudinal reinforcement 202 is welded to the inner wall of the hollow steel tube, and the lower end of the column longitudinal reinforcement 202 is welded to the outer wall of the core column 301, and the welding length is ≥5d (d is the diameter of the column longitudinal reinforcement).

[0023] In this embodiment, the column top connecting plate 104 and the column bottom connecting plate 302 both adopt a pin connection node connection method to achieve the connection between the prefabricated columns and wall panels of the steel-concrete composite structure.

[0024] The technical solutions of this embodiment are as follows: 1. Factory prefabrication production process: The column top connection node assembly 1 should be fabricated in a professional steel structure factory according to the design drawings. Precisely cut and weld the square hollow steel tube (i.e., structural tube 101), stiffener plate 102, beam-column connection gusset plate 103, and column top connection plate 104. Ensure that the through-holes in stiffener plate 102 are appropriately sized and accurately positioned. Welding must comply with the "Code for Acceptance of Construction Quality of Steel Structure Engineering" (GB 50205), with weld quality grade no lower than Level 2.

[0025] The column base connection node assembly 3 should be fabricated in a professional steel structure factory according to the design drawings. Precisely cut and weld the square steel tube core column (i.e., core column 301), column base connection plate 302, pressure-bearing base plate 303, anchor bolt support stiffeners 304, and core column composite stiffeners 305. Concrete flow holes should be opened in the side walls of the square steel tube core column and the core column composite stiffeners 305 according to the design requirements. Studs 306 should be welded to the designated locations. Welding requirements are the same as above.

[0026] First, precisely secure the column base connection node assembly 3 within the precast column mold. Ensure the square steel tube core column's accurate position, elevation, and verticality. Then, tie the column reinforcement skeleton. Place the lower end of the column longitudinal reinforcement 202 against the outer wall of the core column 301 as designed. Arc welding (such as CO2 gas shielded welding) is used to secure it to the outer wall of the core column 301. The weld length must be ≥5d (d is the longitudinal reinforcement diameter) to ensure weld quality. Column stirrups 203 are secured, starting 50mm above the top of the core column 301, according to the designed spacing and pattern. The last 3-5 stirrups are reserved for future use. The column top connection node assembly 1 is then precisely hoisted into place and secured to the top of the mold. The upper end of the column longitudinal reinforcement 202 should be placed against the inner wall of the structural tube 101 (i.e., the square hollow steel tube) and secured to it using arc welding. The weld length must also be ≥5d. The column stirrups 203 extend to 50 mm below the edge of the square hollow steel pipe and end the binding.

[0027] A 100mm×100mm×100mm foam plastic cube (used to form a hand hole 201 for subsequent installation) is accurately placed at the corresponding position of each bolt hole on the pressure base plate 303 of the column base connection node assembly 3.

[0028] After checking that the reinforcement skeleton, node assembly position, and cover thickness meet requirements, pour concrete. The concrete should have good workability (slump should ideally be 160-200mm). Use an inserted vibrator to thoroughly vibrate the concrete in layers (each layer ≤ 500mm thick). Pay special attention to the density of the node area (especially inside and around the square steel tube core column), ensuring that the concrete fully fills the holes in the core column and stiffeners. After pouring, cover and cure (such as by film coating or water spraying) to keep the concrete surface moist for at least 14 days, or until it reaches at least 75% of the design strength.

[0029] After the demoulding strength is reached, the mold is removed. The pre-buried foam plastic cube (for example: 100mm×100mm×100mm) on the pressure base plate 303 is removed to form the installation hand hole 201. The bolt holes or pin holes of the connecting plate are temporarily protected by applying anti-corrosion grease. For designs with beams or walls connected on all four sides, the column top connecting plate or column bottom connecting plate on one side (usually the contact surface with the formwork during prefabricated column production) can be left unwelded. Mark the component, package it together with the matching node plate and transport it to the site, and weld it according to the actual position during installation.

[0030] 2. On-site construction method: ① Pre-embed anchor bolts 307 in the foundation or on the top surface of the precast columns installed in the lower layer according to the designed position. Ensure that the anchor bolt position, elevation, and verticality meet the requirements. Install an adjusting nut 308 on each anchor bolt 307. If necessary, add a temporary positioning steel plate to ensure the anchor bolt is embedded effectively.

[0031] ②. Lift the prefabricated column to the installation location and slowly lower it vertically. Observe through the column foot installation hand hole 201 and align the bolt holes on the pressure base plate 303 with the embedded anchor bolts 307. After the prefabricated column is fully positioned, there should be an installation gap of approximately 50mm between the column foot and the top surface of the foundation / lower column. Use the adjusting nut 308 below the pressure base plate 303 to initially adjust the verticality of the prefabricated column (in both directions). Then, install two adjusting nuts 308 sequentially above the pressure base plate 303 and tighten them in batches according to design requirements using a torque wrench to ensure a secure connection. Monitor and maintain the verticality of the column during the tightening process.

[0032] ③. When a precast column needs to be extended (e.g., an upper-level column), its column base connection node assembly 3 is directly installed on the column top connection node assembly 1 of the lower-level precast column using anchor bolts 307 and adjusting nuts 308. (The lower-level column top is equivalent to the "foundation" of the column on this level.) This connection method is the same as the column-to-foundation connection method.

[0033] ④ After the precast columns are installed and fixed and their verticality corrected, hoist the precast beams. Align the connectors (e.g., end plates) at the ends of the precast beams with the beam-column gusset plates 103 at the tops of the precast columns. Insert high-strength bolts (e.g., grade 10.9), apply pretension as per design requirements, and tighten to form a rigid connection.

[0034] ⑤. Hoist the prefabricated wall panels and connect the connecting parts of the wall panels to the column top connecting plate 104 and the column bottom connecting plate 302 through the pins to form a hinged node.

[0035] ⑥. For the beam-column connection node plates 103 or column top connection plates 104 that are not welded during production, after the prefabricated columns and adjacent components (beams or walls) are in place, the reserved node plates are temporarily spot-welded according to the actual installation position. After the position is verified to be correct, full welding is carried out, and the weld quality meets the requirements of the specifications.

[0036] ⑦. After all prefabricated components (columns, beams, slabs, walls) of this layer or construction section are installed, connected and calibrated, the 50mm installation gap at the column foot and the installation hand hole 201 shall be filled with non-shrinkage grouting material or fine stone concrete (with a strength grade not lower than that of prefabricated column concrete) to ensure density.

[0037] Applying the solution of this embodiment, the prefabricated column of the steel-concrete composite structure includes a column top connection node assembly, a reinforced concrete column body and a column foot connection node assembly, wherein the column top and column bottom adopt steel structure connection assembly, and the rest is reinforced concrete structure. Its production process adopts a fully prefabricated method, and the standardized processing of steel structure node assembly, steel skeleton binding and node assembly positioning and fixing, concrete pouring and maintenance are completed in the factory to form a prefabricated column product. During construction, the column foot of the prefabricated column is connected to the foundation or the lower prefabricated column through anchor bolts and nuts. The prefabricated column can be extended according to the floor requirements through the column-foundation connection method; the column top of the prefabricated column is connected to the prefabricated beam through bolts. On-site construction only requires bolt tightening to achieve dry connection. This process is convenient to construct, does not require on-site wet work, can significantly shorten the construction period, reduce construction waste, conforms to the green building concept of low-carbon and environmental protection, and is suitable for prefabricated construction of low-rise and multi-story buildings.

[0038] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A prefabricated column of a steel-concrete composite structure, characterized in that: It includes a column top connection node assembly (1), a reinforced concrete column body (2), and a column foot connection node assembly (3); The reinforced concrete column body (2) comprises a steel frame and a poured concrete layer, wherein the steel frame comprises a plurality of column longitudinal bars (202) and a plurality of groups of column stirrups (203) arranged on the column longitudinal bars (202); The column top connection node assembly (1) comprises a column top frame and a poured concrete layer, the column top frame comprises a structural tube (101) and a beam-column connection node plate (103) and a column top connection plate (104) arranged on the structural tube (101), the structural tube (101) being connected to the upper end of the steel frame; the beam-column connection node plate (103) is used to connect the prefabricated columns and beam structure of the steel-concrete composite structure, and the column top connection plate (104) is used to connect the prefabricated columns and wall panels of the steel-concrete composite structure; The column base connection node assembly (3) comprises a column base frame and a poured concrete layer, the column base frame comprising a core column (301) and a column base connection plate (302) and a pressure-bearing base plate (303) arranged on the core column (301), the core column (301) being connected to the lower end of the steel frame; the column base connection plate (302) being used to connect a prefabricated column of a steel-concrete composite structure and a wall panel; and the pressure-bearing base plate (303) being used to connect a prefabricated column of a steel-concrete composite structure and a structural member located therebelow.

2. The prefabricated steel-concrete composite structure column according to claim 1 is characterized in that: The column top connection node assembly (1) further includes a stiffening plate (102), the structural tube (101) is a hollow steel tube, and a plurality of stiffening plates (102) are welded inside the hollow steel tube.

3. The prefabricated steel-concrete composite structure column according to claim 2 is characterized in that: The upper end of the column longitudinal reinforcement (202) is welded to the inner wall of the hollow steel tube, and the lower end of the column longitudinal reinforcement (202) is welded to the outer wall of the core column (301).

4. The prefabricated steel-concrete composite structure column according to claim 1 is characterized in that: The column foot connection node assembly (3) further comprises anchor bolt support stiffening ribs (304) and core column combined stiffening ribs (305), and the anchor bolt support stiffening ribs (304) and core column combined stiffening ribs (305) are welded inside the core column (301).

5. The prefabricated steel-concrete composite structure column according to claim 4 is characterized in that: Multiple groups of studs (306) are welded to the outer wall of the core column (301).

6. The prefabricated steel-concrete composite structure column according to any one of claims 1 to 5, characterized in that: The pressure-bearing base plate (303) is fixedly connected to the structural member located below the prefabricated column of the steel-concrete composite structure through anchor bolts (307) pre-buried in the structural member in combination with adjusting nuts (308).

7. The prefabricated steel-concrete composite structure column according to any one of claims 1 to 5, characterized in that: The column top connection plate (104) and the column bottom connection plate (302) both adopt a pin connection node connection method to achieve the connection between the prefabricated column and the wall panel of the steel-concrete composite structure.

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