Steel pipe-reinforced concrete composite column and construction method thereof

Abstract

The present application relates to a kind of steel pipe-steel reinforcement cage concrete composite column and construction method, steel pipe-steel reinforcement cage concrete composite column includes steel pipe, internal reinforcement cage, steel pipe-steel reinforcement cage confined concrete, peripheral reinforcement cage, peripheral concrete;Steel pipe passes through concrete beam-column joint core area and respectively extends a length towards upper and lower end, and with internal reinforcement cage axial welding, set in peripheral reinforcement cage;By pouring concrete in steel pipe-steel reinforcement cage, external pouring peripheral concrete, steel pipe-steel reinforcement cage confined concrete and peripheral concrete are interconnected, form the integrated composite composite column structure.The end of internal reinforcement cage is welded to the end of steel pipe or internal reinforcement cage longitudinal directly penetrates steel pipe.The composite column compared with traditional steel pipe concrete composite column, both guarantee the bearing capacity and seismic performance of beam-column joint core area, significantly reduce the steel consumption, and can improve construction efficiency.

Description

Technical Field

[0001] This invention relates to the field of structural engineering technology, and more specifically, to a steel pipe-reinforced cage concrete composite column and its construction method. Background Technology

[0002] Compared to ordinary reinforced concrete columns, steel-concrete composite columns have higher load-bearing capacity and better seismic performance, making them suitable for major engineering structures with limited load-bearing column cross-sectional dimensions but high design load-bearing capacity. However, existing steel-concrete composite columns still have some technical shortcomings:

[0003] 1) Composite columns are equipped with through steel pipes, which generally result in a large amount of steel used and higher costs.

[0004] 2) The steel pipe separates the concrete inside the steel pipe from the concrete outside the steel pipe. The concrete inside and outside the steel pipe is poured separately, which makes the construction process complicated.

[0005] To effectively address the technical shortcomings of steel-concrete composite columns, the development of a new type of steel-concrete composite column with comparable structural mechanical properties, low cost, and simple construction process has promising application prospects. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the main objective of this invention is to provide a steel pipe-reinforced cage concrete composite column and its construction method, which reduces the amount of steel used and lowers the cost and construction complexity of the composite column while ensuring its mechanical properties.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A steel pipe-reinforced cage concrete composite column includes at least an upper steel pipe and a lower steel pipe, which are arranged coaxially at intervals; the upper steel pipe and the lower steel pipe respectively pass through the core area of ​​the concrete beam-column joint and extend vertically for a certain length.

[0009] A first internal reinforcing cage is provided above the upper steel pipe, and the upper steel pipe is welded to the first internal reinforcing cage; a second internal reinforcing cage is provided below the lower steel pipe, and the lower steel pipe is welded to the second internal reinforcing cage; an intermediate internal reinforcing cage is provided between the upper steel pipe and the lower steel pipe, and the lower end of the upper steel pipe and the upper end of the lower steel pipe are respectively welded to the two ends of the intermediate internal reinforcing cage.

[0010] The upper steel pipe, the lower steel pipe, and each steel cage are filled with steel pipe-steel cage confined concrete; the upper steel pipe, the lower steel pipe, and each steel cage are surrounded by an outer steel cage and surrounded by concrete, and the steel pipe-steel cage confined concrete and the outer concrete are interconnected.

[0011] Furthermore, the upper end of the upper steel pipe is axially welded to the first internal reinforcing cage, and the lower end of the lower steel pipe is axially welded to the second internal reinforcing cage.

[0012] Furthermore, the longitudinal bars of the first internal steel cage directly penetrate the upper steel pipe, and the longitudinal bars of the second internal steel cage directly penetrate the lower steel pipe.

[0013] Furthermore, the first and second internal steel reinforcement cages are reinforced zones; the intermediate internal steel reinforcement cage includes two reinforced zones welded to the upper and lower steel pipes respectively, and an unreinforced zone located between the two reinforced zones.

[0014] The construction method for steel pipe-reinforced cage concrete composite columns includes the following steps:

[0015] S1: Fabricate the upper steel pipe, lower steel pipe, first internal steel cage, second internal steel cage and intermediate internal steel cage in the prefabrication plant;

[0016] S2: Weld the first internal steel cage to the upper steel pipe, the second internal steel cage to the lower steel pipe, the lower end of the middle internal steel cage to the upper end of the lower steel pipe, and the upper end of the middle internal steel cage to the lower end of the upper steel pipe.

[0017] S3: Install an outer steel reinforcement cage outside the upper and lower steel pipes;

[0018] S4: Install the template according to the dimensions of the composite column;

[0019] S5: Pour ordinary concrete inside the column formwork and vibrate it to make it compacted. The steel pipe-reinforcement cage confining concrete is connected to the surrounding concrete.

[0020] Furthermore, when the thickness of the upper steel pipe is not less than the longitudinal reinforcement of the first internal steel cage and the thickness of the upper steel pipe is not less than the longitudinal reinforcement of the second internal steel cage, the first internal steel cage is axially welded to the upper end of the upper steel pipe, and the second internal steel cage is axially welded to the lower end of the lower steel pipe.

[0021] Furthermore, when the thickness of the upper steel pipe is less than the longitudinal reinforcement of the first internal steel cage and the thickness of the upper steel pipe is less than the diameter of the longitudinal reinforcement of the second internal steel cage, the longitudinal reinforcement of the first internal steel cage directly penetrates the upper steel pipe, and the longitudinal reinforcement of the second internal steel cage directly penetrates the lower steel pipe.

[0022] In summary, the present invention has the following advantages:

[0023] 1) Rational Structure: The composite column core, composed of alternating vertical arrangements of upper and lower steel pipes and multiple internal reinforcing cages, is a novel structure proposed in this invention, offering superior comprehensive mechanical performance. This structure not only ensures the bearing capacity and seismic performance of the core area of ​​the beam-column joint but also cleverly controls the vertical stiffness variation of the concrete composite column, avoiding abrupt stiffness changes and thus guaranteeing the safety, reliability, and stability of the composite column's mechanical properties. The division between the reinforced and unreinforced spiral stirrup zones within the internal reinforcing cages ensures a synergistic match between the resistive structure and the load-bearing action. Furthermore, different connection strategies are employed based on the varying thicknesses of the steel pipes to ensure structural adaptability. This composite column structure is rationally designed, fully utilizing the characteristics of steel pipes, reinforcing cages, and concrete, resulting in excellent comprehensive mechanical performance.

[0024] 2) Convenient Construction: The upper and lower steel pipes and all internal reinforcing cages can be prefabricated in a factory, reducing on-site construction. Each section of steel pipe and internal reinforcing cage is short and lightweight, making hoisting easier. The steel pipe-reinforcing cage confined concrete and the surrounding concrete can be poured in one go, greatly simplifying construction. When the beam and column concrete strength grades are different, the steel pipe can effectively prevent the beam concrete from intruding into the column core area, eliminating the need for additional blocking measures when pouring beam concrete, ensuring structural quality, and significantly improving construction efficiency. The construction process of this composite column is simple, reliable, easy to operate, and highly efficient.

[0025] 3) Good economic efficiency: Based on the steel-concrete composite column, the traditional long steel pipe is partially replaced with a steel cage structure, and the concrete does not need to be poured separately, which can significantly reduce the amount of steel used and reduce the difficulty of construction. This composite column structure can greatly save on construction and maintenance costs.

[0026] 4) High practicality: This composite column structure is not only suitable for various building structures containing concrete columns, but can also flexibly meet the needs of different shapes and sizes. The shapes of the composite column and the steel cage stirrups can be ring-shaped, spiral-shaped, square, or rectangular, enhancing its applicability. This invention creates a practical, reliable, and efficient solution to the technical shortcomings of traditional steel-concrete composite columns. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the steel pipe-reinforced cage concrete composite column in Embodiment 1 of the present invention.

[0028] Figure 2 This is a schematic diagram of the steel pipe-reinforced cage concrete composite column in Embodiment 2 of the present invention.

[0029] Figure 3 for Figure 1 AA section view.

[0030] Figure 4 for Figure 1 BB cross-section diagram.

[0031] Figure 5 for Figure 2 CC cross-section view.

[0032] Figure 6 for Figure 2 DD cross-section diagram.

[0033] Figure 7 This is a three-dimensional structural diagram of the steel pipe-reinforced cage concrete composite column of the present invention.

[0034] In the picture:

[0035] 1 is a steel pipe-reinforced cage concrete composite column, 2 is a concrete beam, 31 is the upper steel pipe, 32 is the lower steel pipe, 41 is the first internal reinforcement cage, 42 is the second internal reinforcement cage, 43 is the middle internal reinforcement cage, 51 is the internal reinforcement cage densified zone, 52 is the internal reinforcement cage non-densified zone, 6 is the outer reinforcement cage, 7 is the steel pipe-reinforced cage confined concrete, 8 is the outer concrete, and 9 is the core area of ​​the concrete beam-column joint. Detailed Implementation

[0036] The invention will now be described in further detail with reference to the accompanying drawings.

[0037] Example 1

[0038] like Figure 1 , Figure 3 , Figure 4 , Figure 7 As shown, the steel pipe-reinforced cage concrete composite column 1 includes a steel pipe, a first internal reinforcement cage 41, a second internal reinforcement cage 42, an intermediate internal reinforcement cage 43, and an outer reinforcement cage 6. The outer reinforcement cage 6 is provided inside the steel pipe-reinforced cage concrete composite column 1. The steel pipe and the internal reinforcement cage are arranged coaxially inside the outer reinforcement cage 6. The steel pipe-reinforced cage confined concrete 7 and the outer concrete 8 are connected.

[0039] Specifically, the area where the steel pipe-reinforced cage concrete composite column 1 and the concrete beam 2 overlap is the core area 9 of the concrete beam-column joint. The steel pipe passes through the core area 9 of the concrete beam-column joint and extends a length towards the upper and lower ends respectively.

[0040] Specifically, in Figure 1In the layer shown, the steel pipes include an upper layer steel pipe 31 and a lower layer steel pipe 32 arranged coaxially at intervals. The lower end of the intermediate internal reinforcing cage 43 is welded to the upper end of the lower layer steel pipe 32, and the upper end of the intermediate internal reinforcing cage 43 is welded to the lower end of the upper layer steel pipe 31. The longitudinal bars of the first internal reinforcing cage 41 are welded to one end of the upper layer steel pipe 31, and the longitudinal bars of the second internal reinforcing cage 42 are welded to one end of the lower layer steel pipe 32. This embodiment is applicable when the thickness of the upper layer steel pipe 31 is not less than the longitudinal bars of the first internal reinforcing cage 41, and the thickness of the lower layer steel pipe 32 is not less than the longitudinal bars of the second internal reinforcing cage 42.

[0041] Specifically, such as Figure 1 As shown, the spiral stirrups of the inner steel cage 43 include a reinforced zone and a non-reinforced zone. The spiral stirrup area connected to the upper steel pipe 41 and the lower steel pipe 42 is the reinforced zone 51 of the inner steel cage, and the spiral stirrup area between the two reinforced zones is the non-reinforced zone 52 of the inner steel cage. The distribution of the steel pipes and the inner steel cage between layers is as follows: upper steel pipe 31 - reinforced zone 51 of the inner steel cage - non-reinforced zone 52 of the inner steel cage - reinforced zone 51 of the inner steel cage - lower steel pipe 32.

[0042] Both the first internal steel cage 41 and the second internal steel cage 42 adopt the internal steel cage reinforcement zone 51.

[0043] The present invention also provides a construction method for the above-mentioned steel pipe-reinforced cage concrete composite column, the method comprising the following steps:

[0044] S1: Prefabrication of steel pipes and internal reinforcing cages: According to the design requirements of this invention, steel pipes and internal reinforcing cages for composite columns are fabricated in a prefabrication plant.

[0045] S2: On-site installation of steel pipe-reinforcing cage: Erect steel pipes and internal reinforcing cages, so that the upper steel pipe 31 and the lower steel pipe 32 pass through the core area 9 of the concrete beam-column joint and extend to the upper and lower ends respectively; weld the lower end of the middle internal reinforcing cage 43 to the upper end of the lower steel pipe 32, and weld the upper end of the middle internal reinforcing cage 43 to the lower end of the upper steel pipe 31.

[0046] S3: Installation of outer reinforcing cage 6: Install outer reinforcing cage 6 according to design requirements;

[0047] S4: Column formwork installation: Install the column formwork according to the dimensions of the composite column;

[0048] S5: Pouring concrete: Ordinary concrete is poured inside the column formwork and vibrated to ensure compaction. The steel pipe-reinforcement cage confined concrete 7 is connected to the surrounding concrete 8.

[0049] S6: Removal of formwork: After the concrete curing is completed, the column formwork is removed to form the steel pipe-reinforced cage concrete composite column 1.

[0050] Example 2

[0051] like Figure 2 , Figure 5 , Figure 6 and Figure 7 As shown, the difference between this embodiment and embodiment 1 is that the longitudinal bars of the first internal steel cage 41 and the second internal steel cage 42 directly penetrate the steel pipe. This embodiment is applicable to cases where the thickness of the steel pipe is less than the diameter of the longitudinal bars of the internal steel cage.

[0052] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A composite column of steel pipe and reinforced concrete cage, characterized in that: It includes at least an upper steel pipe and a lower steel pipe, which are arranged coaxially at intervals; the upper steel pipe and the lower steel pipe pass through the core area of ​​the concrete beam-column joint and extend vertically for a certain length; A first internal reinforcing cage is provided above the upper steel pipe, and the upper steel pipe is welded to the first internal reinforcing cage; a second internal reinforcing cage is provided below the lower steel pipe, and the lower steel pipe is welded to the second internal reinforcing cage; an intermediate internal reinforcing cage is provided between the upper steel pipe and the lower steel pipe, and the lower end of the upper steel pipe and the upper end of the lower steel pipe are respectively welded to the two ends of the intermediate internal reinforcing cage. The upper steel pipe, the lower steel pipe, and each steel cage are filled with steel pipe-steel cage confined concrete; the upper steel pipe, the lower steel pipe, and each steel cage are surrounded by an outer steel cage and surrounded by concrete, and the steel pipe-steel cage confined concrete and the outer concrete are interconnected.

2. The steel pipe-reinforced cage concrete composite column according to claim 1, characterized in that: The upper end of the upper steel pipe is axially welded to the first internal reinforcing cage, and the lower end of the lower steel pipe is axially welded to the second internal reinforcing cage.

3. The steel pipe-reinforced cage concrete composite column according to claim 1, characterized in that: The longitudinal bars of the first internal steel cage directly penetrate the upper steel pipe, and the longitudinal bars of the second internal steel cage directly penetrate the lower steel pipe.

4. The steel pipe-reinforced cage concrete composite column according to claim 1, characterized in that: The first and second internal steel reinforcement cages are the reinforced zones; the intermediate internal steel reinforcement cage includes two reinforced zones welded to the upper and lower steel pipes respectively, and an unreinforced zone located between the two reinforced zones.

5. The construction method of the steel pipe-reinforced cage concrete composite column according to any one of claims 1-4, characterized in that, Includes the following steps: S1: Fabricate the upper steel pipe, lower steel pipe, first internal steel cage, second internal steel cage and intermediate internal steel cage in the prefabrication plant; S2: Weld the first internal steel cage to the upper steel pipe, the second internal steel cage to the lower steel pipe, the lower end of the middle internal steel cage to the upper end of the lower steel pipe, and the upper end of the middle internal steel cage to the lower end of the upper steel pipe. S3: Install an outer steel reinforcement cage outside the upper and lower steel pipes; S4: Install the template according to the dimensions of the composite column; S5: Pour ordinary concrete inside the column formwork and vibrate it to make it compacted. The steel pipe-reinforcement cage confining concrete is connected to the surrounding concrete.

6. The construction method according to claim 5, characterized in that: When the thickness of the upper steel pipe is not less than the longitudinal reinforcement of the first internal steel cage and the thickness of the upper steel pipe is not less than the longitudinal reinforcement of the second internal steel cage, the first internal steel cage is axially welded to the upper end of the upper steel pipe, and the second internal steel cage is axially welded to the lower end of the lower steel pipe.

7. The construction method according to claim 5, characterized in that: When the thickness of the upper steel pipe is less than the longitudinal reinforcement of the first internal steel cage and the thickness of the upper steel pipe is less than the diameter of the longitudinal reinforcement of the second internal steel cage, the longitudinal reinforcement of the first internal steel cage directly penetrates the upper steel pipe, and the longitudinal reinforcement of the second internal steel cage directly penetrates the lower steel pipe.

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