A construction method for prefabricated hollow columns

Abstract

This invention discloses a construction method for precast hollow columns, comprising the following steps: preparing a cup-shaped foundation, a first-layer precast RC hollow column, an intermediate-layer precast RC hollow column, a top-layer precast RC hollow column, a precast horizontal composite beam, and a precast composite slab; sequentially completing the connection between the first-layer precast RC hollow column and the cup-shaped foundation, the connection between the first-layer precast RC hollow column, the precast horizontal composite beam, and the precast composite slab, the connection between the intermediate-layer precast RC hollow column and the first-layer precast RC hollow column, the connection between the intermediate-layer precast RC hollow column, the precast horizontal composite beam, and the precast composite slab, the connection between the top-layer precast RC hollow column and the intermediate-layer precast RC hollow column, and the connection between the top-layer precast RC hollow column, the precast horizontal composite beam, and the precast composite slab. This invention can meet the stress requirements of precast concrete frame structures for bearing horizontal loads and bending moments while using precast hollow RC columns as frame columns to reduce the structural self-weight.

Description

Technical Field

[0001] This invention relates to the field of prefabricated building construction technology, and more specifically to a construction method for prefabricated hollow columns. Background Technology

[0002] my country's prefabricated building industry has been developing for more than 70 years, from the initial manual operation to mechanized production, from learning from advanced foreign technologies to being able to innovate independently, experiencing both highs and lows along the way.

[0003] With economic and technological development, the advantages of cast-in-place construction have gradually disappeared, and prefabricated construction has become a key development direction for my country's construction industry. Meanwhile, over the past five years, the government has successively introduced many crucial policies to vigorously promote the development of prefabricated construction. As a crucial vertical support component in prefabricated construction, RC (Reinforced Concrete) columns, and RC beams, as the main bending components, require in-depth research on beam-column joints, which has a decisive impact on the application and development of prefabricated construction.

[0004] Based on the stress characteristics of frame columns, precast assembled frame columns mostly use precast solid concrete columns, and rarely precast hollow columns. Precast concrete pipe piles are commonly used in foundation design, with their material selection and reinforcement details fully considering their primary compressive stress characteristics. The stress characteristics of frame columns differ slightly from those of piles. In addition to compression, the column also bears bending moments caused by horizontal load transfer; therefore, their construction and connections differ slightly from those of hollow piles.

[0005] To fundamentally improve the performance of prefabricated buildings, including the convenience of production, transportation, and construction; the seismic safety and reliability of the structure; and the toughness and resilience after strong earthquakes—in other words, to possess the characteristics of simplicity, safety, and sustainability—the inventors' research group has developed a "3S" technology system for prefabricated buildings, including a prefabricated frame structure system and a prefabricated shear wall structure system. The "3S" stands for: Simple: encompassing simple production, convenient transportation, and easy construction; production can utilize traditional methods or fully automated intelligent production lines (Smart); on-site installation can also utilize robotic welding (Smart), achieving intelligent empowerment. Safe: meaning a clear and reliable structural force transmission path, a clear seismic mechanism, excellent seismic performance, and easy implementation of waterproofing, insulation, and heat insulation properties. Sustainable: encompassing good seismic toughness, facilitating functional recovery after strong earthquakes, good durability, and the use of green building materials as much as possible to achieve sustainable, low-carbon, and green development. This is a construction method for prefabricated hollow columns, one component of the proposed "3S" technology system for prefabricated buildings. Summary of the Invention

[0006] In view of this, the present invention provides a construction method for prefabricated hollow columns, which aims to solve the above-mentioned technical problems.

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

[0008] A construction method for prefabricated hollow columns includes the following steps:

[0009] S1. Prepare the cup-shaped foundation, the first-floor RC precast hollow columns, the middle-floor RC precast hollow columns, the top-floor RC precast hollow columns, the precast horizontal composite beams, and the precast composite slabs;

[0010] S2. The first-floor RC precast hollow column is hoisted and inserted into the cup-shaped foundation to position, correct and fix the first-floor RC precast hollow column 2;

[0011] S3. Hoist the precast horizontal composite beam, add additional anchor bars in the connection area between the first-floor RC precast hollow column and the precast horizontal composite beam, hoist the precast composite slab, and lay the distributed steel bars on the upper part of the precast composite slab; set up the formwork and pour the concrete for the cavity of the first-floor RC precast hollow column, the precast horizontal composite beam and the upper part of the precast composite slab.

[0012] S4. Hoist the intermediate layer RC precast hollow columns, position and correct the intermediate layer RC precast hollow columns, temporarily anchor the first layer RC precast hollow columns and the intermediate layer RC precast hollow columns through welding positioning devices, construct the bevel butt weld between the steel hoop plates of the first layer RC precast hollow columns and the intermediate layer RC precast hollow columns, repeat step S3, complete the construction of the intermediate layer RC precast hollow columns, precast horizontal composite beams and precast composite slabs, and cut off the temporary anchor welding positioning devices;

[0013] S5. Subsequently, repeat steps S3 and S4 in sequence to construct the main frame of other intermediate layers.

[0014] S6. Weld the anchor plates at the ends of the longitudinal steel bars of the top-level RC precast hollow column, and complete the construction of the top-level RC precast hollow column, precast horizontal composite beam and precast composite slab in the manner of step S4.

[0015] S7. The main frame structure construction is completed.

[0016] Preferably, in the above-mentioned construction method for prefabricated hollow columns, the top surface of the cup-shaped foundation forms a funnel-shaped opening that is larger at the top and smaller at the bottom.

[0017] Preferably, in the above-mentioned construction method of prefabricated hollow columns, the first-floor RC prefabricated hollow column includes longitudinal steel bars, additional anchor bars and a cavity; additional anchor bars are provided on both sides of the cavity at the upper end of the first-floor RC prefabricated hollow column, and a portion of the longitudinal steel bars and additional anchor bars extend out of the upper end of the first-floor RC prefabricated hollow column as reserved steel bars, and a steel joint is provided at the end of the reserved steel bars.

[0018] Preferably, in the above-mentioned construction method of prefabricated hollow column, additional anchor bars are provided at both the upper and lower ends of the intermediate layer RC prefabricated hollow column. The longitudinal steel bars and additional anchor bars extend a portion of the steel bars at both the upper and lower ends of the intermediate layer RC prefabricated hollow column as reserved steel bars, and steel joints are provided at the ends of the reserved steel bars.

[0019] Preferably, in the above-mentioned construction method for prefabricated hollow columns, an additional anchor bar is provided at the lower end of the top-level RC prefabricated hollow column. The longitudinal steel bars of the column and the additional anchor bars extend a portion of the steel bars at the lower end of the top-level RC prefabricated hollow column as reserved steel bars. A steel joint is provided at the end of the reserved steel bars. A portion of the longitudinal steel bars of the column at the upper end of the top-level RC prefabricated hollow column extends a portion of the steel bars as reserved steel bars, and an anchor plate is welded at the end.

[0020] Preferably, in the above-mentioned construction method for prefabricated hollow columns, the steel joint includes steel hoop plates, steel anchor plates, steel anchor nuts, studs, and holes. Four steel hoop plates are welded to form a rectangular cylinder. A steel anchor plate is welded inside the cylinder. A hole is opened in the center of the steel anchor plate. Multiple studs are welded to the inner wall of the cylinder. The reserved steel bars pass through the steel anchor plate and are fixed to the end of the reserved steel bars by the steel anchor nuts. A gasket is provided between the steel anchor nuts and the steel anchor plates.

[0021] Preferably, in the above-mentioned construction method for prefabricated hollow columns, the welding positioning device includes a connecting lug plate, a connecting clamp plate, and temporary bolts; the connecting lug plate is fixed on the steel hoop plate, the two connecting clamp plates are clamped on the outer sides of the two corresponding connecting lug plates, and the temporary bolts are used to fasten the connecting lug plate and the connecting clamp plate.

[0022] Preferably, in the above-mentioned construction method for prefabricated hollow columns, the prefabricated horizontal composite beam has longitudinal reinforcement and stirrups; the prefabricated composite slab includes top chord reinforcement and web reinforcement.

[0023] Preferably, in the above-mentioned construction method for prefabricated hollow columns, the gap between the outer surface of the first-layer RC prefabricated hollow column and the cup-shaped foundation is filled with self-compacting concrete or recycled concrete; the cavities of the first-layer RC prefabricated hollow column, the intermediate-layer RC prefabricated hollow column and the top-layer RC prefabricated hollow column are filled with self-compacting concrete or recycled concrete; ultra-high strength and high ductility concrete or high-performance recycled concrete is poured at the connection nodes between the first-layer RC prefabricated hollow column, the intermediate-layer RC prefabricated hollow column and the top-layer RC prefabricated hollow column and the prefabricated horizontal composite beam.

[0024] Preferably, in the above-mentioned construction method for prefabricated hollow columns, the prefabricated horizontal composite beams and prefabricated composite slabs are a combination of cast-in-place beams and slabs or a combination of prefabricated beams and cast-in-place slabs.

[0025] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a construction method for prefabricated hollow columns. The present invention uses prefabricated hollow columns, which are convenient for production, transportation, and construction. Self-compacting concrete or recycled concrete is used to fill the gap between the first-layer prefabricated hollow columns and the cup-shaped foundation, as well as the cavities of each layer of prefabricated columns, achieving sustainable, low-carbon, and green development. The steel hoops of each layer of prefabricated hollow columns are connected by manual or robotic welding, and the longitudinal reinforcement of the solid prefabricated hollow columns in the core area is effectively connected. This ensures that the connection of the column longitudinal reinforcement is staggered from the beam-column core area, avoiding problems in confined construction spaces. The longitudinal reinforcement bars of the columns are connected one by one within the core area of ​​the small beam-column structure, which ensures the continuous setting of the longitudinal reinforcement bars in the core area of ​​the beam-column structure. The closed cavity of the upper and lower connecting steel hoops is integrated with the core area of ​​the beam-column structure by cast-in-place concrete, which is convenient and efficient to construct, and the connection quality is reliable. This results in a clear and reliable force transmission path for the precast assembled hollow column structure, a clear seismic mechanism, and excellent seismic performance. By filling the connection node area between the precast assembled hollow column and the precast horizontal composite beam with ultra-high strength and high ductility concrete or high performance recycled concrete, the core area of ​​the beam-column structure has good seismic toughness, which is conducive to functional recovery after strong earthquakes and has good durability. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0027] Figure 1 The attached figure is a side projection schematic diagram of the three-layer prefabricated assembled frame structure provided by the present invention;

[0028] Figure 2The attached figure is a front projection schematic diagram of the three-layer prefabricated assembled frame structure provided by the present invention;

[0029] Figure 3 The attached figure is a three-dimensional structural schematic diagram of the connection node between the prefabricated assembled hollow column and the prefabricated horizontal composite beam provided by the present invention.

[0030] Figure 4 The attached figure is a three-dimensional structural schematic diagram of the first-layer RC precast hollow column provided by the present invention;

[0031] Figure 5 The attached figure is a three-dimensional structural schematic diagram of the intermediate layer RC prefabricated hollow column provided by the present invention;

[0032] Figure 6 The attached figure is a three-dimensional structural schematic diagram of the top-layer RC prefabricated hollow column provided by the present invention;

[0033] Figure 7 The attached figure is a three-dimensional structural schematic diagram of the cup rim base provided by the present invention;

[0034] Figure 8 The attached figure is a three-dimensional structural schematic diagram of the prefabricated horizontal composite beam provided by the present invention;

[0035] Figure 9 The attached figure is a three-dimensional structural schematic diagram of the prefabricated composite slab provided by the present invention;

[0036] Figure 10 The attached figure is a three-dimensional structural schematic diagram of the welding positioning device provided by the present invention.

[0037] in:

[0038] 1-Cup-shaped foundation; 101-Concrete pad; 102-Isolated foundation; 103-Funnel-shaped opening; 2-First floor RC precast hollow column; 3-Second floor RC precast hollow column; 4-Top floor RC precast hollow column; 5-Column longitudinal reinforcement; 6-Additional anchor bars; 7-Cavity; 8-Precast horizontal composite beam; 801-Beam longitudinal reinforcement; 802-Beam stirrups; 9-Precast composite slab; 901-Top chord reinforcement; 902-Web reinforcement; 10-Additional diagonal brace; 11-Steel hoop plate; 12-Reinforcement anchor plate; 13-Reinforcement anchor nut; 14-Stud; 15-Hole; 16-Welding positioning device; 1601-Butt lug; 1602-Butt clamp; 1603-Temporary bolt; 17-Anchor plate. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] See appendix Figure 1 To be continued Figure 10 This invention discloses a construction method for prefabricated hollow columns, comprising the following steps:

[0041] S1. Preparation of cup-shaped foundation 1, first-layer RC precast hollow column 2, middle-layer RC precast hollow column 3, top-layer RC precast hollow column 4, precast horizontal composite beam 8 and precast composite slab 9;

[0042] S2. Hoist the first-layer RC precast hollow column 2 into the cup-shaped foundation 1, position and correct the first-layer RC precast hollow column 2, and fill the gap between the outer surface of the first-layer RC precast hollow column 2 and the cup-shaped foundation 1 with fine aggregate concrete.

[0043] S3. Erect scaffolding, hoist the precast horizontal composite beam 8, add additional anchor bars 6 in the connection node area between the first-floor RC precast hollow column 2 and the precast horizontal composite beam 8, weld them to the diagonal of the lap joint between the column longitudinal reinforcement 5 and the beam longitudinal reinforcement 801 by welding, and add additional diagonal bracing 10, hoist the precast composite slab 9, embed pipelines, lay the distribution reinforcement on the top of the precast composite slab 9, set up formwork, pour concrete for the cavity 7 of the first-floor RC precast hollow column 2, the precast horizontal composite beam 8 and the top of the precast composite slab 9, and cure the concrete.

[0044] S4. Hoist the intermediate layer RC precast hollow column 3, position and correct the intermediate layer RC precast hollow column 3, temporarily anchor the first layer RC precast hollow column 2 and the intermediate layer RC precast hollow column 3 through the welding positioning device 16, construct the bevel butt weld between the first layer RC precast hollow column 2 and the intermediate layer RC precast hollow column 3 steel hoop plate 11, repeat step S3, complete the construction of the intermediate layer RC precast hollow column 3, precast horizontal composite beam 8 and precast composite slab 9, and cut off the temporary anchor welding positioning device 16;

[0045] S5. Then repeat steps S3 and S4 in sequence to carry out the construction of other intermediate layer main frames.

[0046] S6. Hoist the top-level RC precast hollow column 4, position and correct the top-level RC precast hollow column 4, temporarily anchor the intermediate-level RC precast hollow column 3 and the top-level RC precast hollow column 4 through the welding positioning device 16, construct the bevel butt weld between the intermediate-level RC precast hollow column 3 and the top-level RC precast hollow column 4 steel hoop plate 11, weld the anchor plate 17 at the end of the longitudinal steel bar 5 of the top-level RC precast hollow column 4, repeat step S3, complete the construction of the top-level RC precast hollow column 4, precast horizontal composite beam 8 and precast composite slab 9, and cut off the temporary anchor welding positioning device 16;

[0047] S7. The main frame structure construction is completed.

[0048] See appendix Figure 7 The cup-shaped foundation 1 includes a concrete pad 101, an independent foundation 102, and a funnel-shaped opening 103. The independent foundation 102 is poured on the concrete pad 101. A funnel-shaped opening with a larger top and smaller bottom is opened in the center of the independent foundation 102. The side length of the square bottom surface of the opening is at least 2cm longer than the side length of the first-floor RC precast hollow column 2.

[0049] See appendix Figure 4 The first-floor precast hollow RC column 2 includes longitudinal steel bars 5, additional anchor bars 6, and a cavity 7. Additional anchor bars 6 are provided on both sides of the cavity 7 at the upper end of the first-floor precast hollow RC column 2. The longitudinal steel bars 5 and additional anchor bars 6 extend a portion of the steel bars at the upper end of the first-floor precast hollow RC column 2 as reserved steel bars. A steel joint is provided at the end of the reserved steel bar. The steel joint includes a steel hoop plate 11, a steel bar anchor plate 12, a steel bar anchor nut 13, a stud 14, and a hole 15. Four steel hoop plates are welded to form a rectangular cylinder. The steel bar anchor plate 12 is welded inside the cylinder. A hole 15 with a diameter of about 20cm is opened in the center of the steel bar anchor plate 12. Multiple studs 14 are welded to the inner wall of the cylinder. The reserved steel bars pass through the steel bar anchor plate 12 and are fixed to the end of the reserved steel bars by the steel bar anchor nut 13. A gasket is provided between the steel bar anchor nut 13 and the steel bar anchor plate 12.

[0050] See appendix Figure 5 The intermediate layer RC precast hollow column 3 is provided with additional anchor bars 6 at both its upper and lower ends. At the same time, the longitudinal steel bars 5 and the additional anchor bars 6 extend a portion of the steel bars at both the upper and lower ends of the intermediate layer RC precast hollow column 3 as reserved steel bars, and a steel joint is provided at the end of the reserved steel bars.

[0051] See appendix Figure 6The top-level RC precast hollow column 4 has an additional anchor bar 6 at its lower end. At the same time, the column longitudinal steel bar 5 and the additional anchor bar 6 extend a portion of the steel bar at the lower end of the top-level RC precast hollow column 4 as reserved steel bars. A steel joint is set at the end of the reserved steel bar. The column longitudinal steel bar 5 at the upper end of the top-level RC precast hollow column 4 extends a portion of the steel bar as reserved steel bars, and an anchor plate 17 is welded at the end.

[0052] See appendix Figure 8 To be continued Figure 9 The precast horizontal composite beam 8 includes longitudinal reinforcement 801 and stirrups 802; the precast composite slab 9 includes top chord reinforcement 901 and web reinforcement 902.

[0053] See appendix Figure 10 The welding positioning device 16 includes a docking lug 1601, a docking clamp 1602, and a temporary bolt 1603. The docking lug 1601 is fixed on the steel hoop 11, and the two docking clamps 1602 are clamped on the outside of the two corresponding docking lugs 1601. The temporary bolt 1603 tightens the docking lug 1601 and the docking clamp 1602.

[0054] To further optimize the above technical solution, the gap between the outer surface of the first-layer RC precast hollow column 2 and the cup-shaped foundation 1 can be filled with self-compacting concrete or recycled concrete; the concrete filling the cavities 7 of the first-layer RC precast hollow column 2, the middle-layer RC precast hollow column 3 and the top-layer RC precast hollow column 4 can be filled with self-compacting concrete or recycled concrete.

[0055] In this embodiment, the precast horizontal composite beam 8 and the precast composite slab 9 can be replaced with a combination of cast-in-place beams and slabs, or a combination of precast beams and cast-in-place slabs, etc.

[0056] To further optimize the above technical solution, ultra-high strength and high ductility concrete or high-performance recycled concrete are poured at the connection nodes between the first-layer RC precast hollow column 2, the middle-layer RC precast hollow column 3, and the top-layer RC precast hollow column 4 and the precast horizontal composite beam 8.

[0057] To further optimize the above technical solution, the steel hoop plates at the ends of the precast hollow columns 2, 3, and 4 of the first layer RC precast hollow columns, the middle layer RC precast hollow columns, and the top layer RC precast hollow columns are welded and fixed by manual or robotic welding.

[0058] This embodiment uses precast RC hollow columns as the frame columns of the precast assembled concrete structure, which can significantly save concrete usage, thereby reducing the structural self-weight. Furthermore, the RC precast hollow columns of each floor can be quickly assembled by welding steel hoops together. In addition, this invention uses a cast-in-place method to simultaneously pour concrete in the column cavities, beam-column joint areas, and beam and slab cast-in-place areas, achieving the connection between the precast horizontal composite beams, precast composite slabs, and RC precast hollow columns. Therefore, this invention can meet the stress requirements of precast assembled concrete frame structures for bearing horizontal loads and bending moments while using RC precast hollow columns to reduce structural self-weight, offering advantages such as saving concrete usage and reducing foundation costs.

[0059] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0060] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A construction method for prefabricated hollow columns, characterized in that, Includes the following steps: S1. Prepare cup-shaped foundation (1), first-layer RC precast hollow column (2), middle-layer RC precast hollow column (3), top-layer RC precast hollow column (4), precast horizontal composite beam (8) and precast composite slab (9). S2. Hoist the first-floor RC precast hollow column (2) into the cup-shaped foundation (1) to position, correct and fix the first-floor RC precast hollow column (2); S3. Hoist the precast horizontal composite beam (8), add additional anchor bars (6) in the connection area between the first-floor RC precast hollow column (2) and the precast horizontal composite beam (8), hoist the precast composite slab (9), and lay the distributed steel bars on the top of the precast composite slab (9); set up the formwork and pour the concrete for the cavity (7) of the first-floor RC precast hollow column (2), the precast horizontal composite beam (8) and the top of the precast composite slab (9); S4. Hoist the intermediate layer RC precast hollow column (3), position and correct the intermediate layer RC precast hollow column (3), temporarily anchor the first layer RC precast hollow column (2) and the intermediate layer RC precast hollow column (3) through the welding positioning device (16), carry out the construction of the bevel butt weld between the steel hoop plate (11) of the first layer RC precast hollow column (2) and the intermediate layer RC precast hollow column (3), repeat step S3, complete the construction of the intermediate layer RC precast hollow column (3), precast horizontal composite beam (8) and precast composite plate (9), and cut off the temporary anchor welding positioning device (16). S5. Subsequently, repeat steps S3 and S4 in sequence to construct the main frame of other intermediate layers. S6. Weld the anchor plate (17) at the end of the longitudinal steel bar (5) of the top-level RC precast hollow column (4), and complete the construction of the top-level RC precast hollow column (4), precast horizontal composite beam (8) and precast composite slab (9) in accordance with step S4. S7. Construction of the main frame structure is complete; The first-floor RC precast hollow column (2) includes longitudinal steel bars (5), additional anchor bars (6) and cavity (7); additional anchor bars (6) are provided on both sides of the cavity (7) at the upper end of the first-floor RC precast hollow column (2), and a portion of the longitudinal steel bars (5) and additional anchor bars (6) extend out at the upper end of the first-floor RC precast hollow column (2) as reserved steel bars, and steel joints are provided at the ends of the reserved steel bars; The steel joint includes a steel hoop plate (11), a steel bar anchor plate (12), a steel bar anchor nut (13), a stud (14), and a hole (15). Four steel hoop plates (11) are welded to form a rectangular cylinder. A steel bar anchor plate (12) is welded inside the cylinder. A hole (15) is opened in the center of the steel bar anchor plate (12). Multiple studs (14) are welded to the inner wall of the cylinder. The reserved steel bar passes through the steel bar anchor plate (12) and is fixed to the end of the reserved steel bar by the steel bar anchor nut (13). A gasket is provided between the steel bar anchor nut (13) and the steel bar anchor plate (12).

2. The construction method for a prefabricated hollow column according to claim 1, characterized in that, The cup base (1) forms a funnel-shaped opening (103) on the top surface, which is larger at the top and smaller at the bottom.

3. The construction method for a prefabricated hollow column according to claim 1, characterized in that, Additional anchor bars (6) are provided at both the upper and lower ends of the intermediate layer RC precast hollow column (3). The longitudinal steel bars (5) and additional anchor bars (6) extend a portion of the steel bars at both the upper and lower ends of the intermediate layer RC precast hollow column (3) as reserved steel bars. Steel joints are provided at the ends of the reserved steel bars.

4. The construction method for a prefabricated hollow column according to claim 1, characterized in that, Additional anchor bars (6) are provided at the lower end of the top-level RC precast hollow column (4). The column longitudinal bars (5) and additional anchor bars (6) extend a portion of the bars at the lower end of the top-level RC precast hollow column as reserved bars. A steel joint is provided at the end of the reserved bars. The column longitudinal bars (5) at the upper end of the top-level RC precast hollow column (4) extend a portion of the bars as reserved bars, and an anchor plate (17) is welded at the end.

5. The construction method for a prefabricated hollow column according to claim 1, characterized in that, The welding positioning device (16) includes a docking lug (1601), a docking clamp (1602), and a temporary bolt (1603); the docking lug (1601) is fixed on the steel hoop plate (11), the two docking clamps (1602) are clamped on the outside of the two corresponding docking lugs (1601), and the temporary bolt (1603) is used to fasten the docking lug (1601) and the docking clamp (1602).

6. The construction method for a prefabricated hollow column according to claim 1, characterized in that, The precast horizontal composite beam (8) has longitudinal reinforcement (801) and stirrups (802); the precast composite slab (9) includes top chord reinforcement (901) and web reinforcement (902).

7. The construction method for a prefabricated hollow column according to claim 1, characterized in that, The gap between the outer surface of the first-layer RC precast hollow column (2) and the cup-shaped foundation is filled with self-compacting concrete or recycled concrete; the cavities (7) of the first-layer RC precast hollow column (2), the middle-layer RC precast hollow column (3) and the top-layer RC precast hollow column (4) are filled with self-compacting concrete or recycled concrete; the connection nodes of the first-layer RC precast hollow column (2), the middle-layer RC precast hollow column (3) and the top-layer RC precast hollow column (4) with the precast horizontal composite beam (8) are respectively filled with ultra-high strength high ductility concrete or high performance recycled concrete.

8. A construction method for a prefabricated hollow column according to claim 7, characterized in that, The precast horizontal composite beam (8) and the precast composite slab (9) are a combination of cast-in-place beams and slabs or a combination of precast beams and cast-in-place slabs.

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