Prefabricated concrete hollow column and construction method thereof

Abstract

This invention relates to the field of precast hollow concrete columns, specifically to a precast hollow concrete column and its construction method, comprising longitudinal reinforcement, angle steel, outer stirrups, and additional stirrups. The lower end of the additional stirrups is tied and fixedly connected to the outer stirrups. The longitudinal reinforcement is tied and connected to the upper end of the outer stirrups, and the angle steel is placed on the upper end of the outer stirrups. A concrete slab is poured between the outer stirrups and the additional stirrups. The concrete slab is foldable and positioned and fixed by the outer angle steel, which is fastened with a hoop. The lower longitudinal reinforcement protrudes and is fixed to the upper longitudinal reinforcement by a steel mesh. A post-cast section is filled and connected at the center of the upper and lower hollow columns, and a second additional stirrup is provided inside the upper and lower hollow columns. This structural design facilitates the processing of precast hollow concrete columns.

Description

Technical Field

[0001] This invention relates to the field of precast concrete hollow column technology, specifically a precast concrete hollow column and its construction method. Background Technology

[0002] Precast hollow concrete columns consist of two parts: precast and cast-in-place. Specially constructed thin slabs are easily and efficiently rolled and folded to form the precast hollow concrete column. After the precast column is installed on-site, concrete is poured into the resulting cavity, allowing the cast-in-place and precast parts to share the load, thus forming a concrete column. The upper and lower layers of precast columns are connected as a whole by local cast-in-place concrete, forming a "precast monolithic concrete column structure system." Combined with precast structures, this system offers advantages such as fast construction speed, low self-weight, and good structural integrity. However, existing precast columns suffer from problems such as high self-weight, difficulty in hoisting, difficulty in connecting upper and lower columns with reinforcing bars, and high installation difficulty. To address these issues, precast hollow concrete columns are proposed as a solution. Summary of the Invention

[0003] To address the problems in the prior art, this invention provides a precast hollow concrete column and its construction method.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a precast concrete hollow column and its construction method, including longitudinal bars, angle steel, outer stirrups and additional stirrups, wherein the lower end of the additional stirrups is tied and fixedly connected to the outer stirrups, the longitudinal bars are tied and connected to the upper end of the outer stirrups, and the angle steel is placed at the upper end of the outer stirrups, and a concrete slab is poured between the outer stirrups and the additional stirrups;

[0005] The concrete slab can be folded and is positioned and fixed by the outer angle steel, which is fastened by a hoop.

[0006] Specifically, the lower longitudinal reinforcement protrudes and is fixed to the upper longitudinal reinforcement by a steel mesh. The upper hollow column and the lower hollow column are connected by a post-cast section in the center of the filling, and the upper hollow column and the lower hollow column are provided with a second additional stirrup inside.

[0007] Specifically, the upper and lower ends of the steel cage are fixed to the upper and lower hollow columns respectively, and the steel cage is connected to the post-cast section in the transverse position.

[0008] Specifically, the lower end of the upper hollow column is connected by mechanical bolts, and the lower end of the mechanical bolts is fixed to the lower hollow column at the lower end position. The mechanical bolts serve to fix the longitudinal ribs on both sides. The upper and lower hollow columns are provided with fitting and fixing plates at their front and rear ends. The fitting and fixing plates are fixed to the upper and lower hollow columns respectively by fastening bolts. The side ends of the fitting and fixing plates and the two ends of the fitting and fixing plates are fastened with screws to a first fitting casting structure and a second fitting casting structure.

[0009] Specifically, the second co-casting structure includes a first limiting component and a second limiting component. The first limiting component and the second limiting component have the same structure and are symmetrically arranged. A first insertion template and a second insertion template are inserted between the first limiting component and the second limiting component. The first insertion template and the second insertion template are inserted later. The first insertion template, the second insertion template, the first limiting component, and the second limiting component constitute a sealed casting structure.

[0010] Specifically, the first limiting component includes a positioning block, side seats, mating end frames, springs, transverse guide rods, hydraulic telescopic rods, fastening pins, docking hinge seats, extension plates, casting end seats, upper templates, movable flipping shafts, and fitting templates. Side seats are fixedly connected to both ends of the positioning block. A mating end frame is fixedly connected to the side seats. A spring is elastically connected to the mating end frame, and the lower end of the spring is elastically connected to the upper template. A fitting template is hinged to the upper left side of the upper template, and the upper end of the fitting template is fixed to the positioning block. A transverse guide rod is fixedly connected to the lower right side of the positioning block. A hydraulic telescopic rod is hinged to the transverse guide rod, and the lower end of the hydraulic telescopic rod is hinged to the docking hinge seat. The docking hinge seat is fixedly connected to the upper template. The upper template is fixed to the first insertion template via fastening pins. An extension plate is fixedly connected to the upper side of the upper template. A casting end seat is fixedly mounted on the extension plate, and the casting end seat and the extension plate are interconnected. The fitting template and the upper template are hinged together via a movable flipping shaft.

[0011] A construction method for precast concrete hollow columns includes the following steps:

[0012] S1. First, tie the steel mesh, arrange the angle steel, place the fabricated additional stirrups on top of the ordinary steel bars, then pour concrete and cure it. The ordinary steel bars are exposed at both ends of the thin plate.

[0013] S2. After the pouring is completed, remove the angle steel and start bending the stirrups. Fold the concrete slab up and insert additional longitudinal bars at the 135° stirrup bend to anchor the outer stirrups. Place angle steel at the four corners and fix it by rotating it 90° with the designed stirrup sleeves staggered from each other.

[0014] S3. Once prefabricated in the factory, the components can be hoisted and transported to the construction site.

[0015] S4. Secure the connection between the upper and lower precast columns, and finally pour the hollow area concrete, waiting for the concrete to fully harden.

[0016] The beneficial effects of this invention are:

[0017] First, this invention utilizes a high-efficiency precast hollow concrete column formed by folding to solve the problems of heavy weight and cumbersome on-site operations of conventional precast columns. The products corresponding to this technology have advantages such as adjustable quality, convenient hoisting and transportation, no need for on-site reinforcement and formwork, low production cost, and high construction efficiency.

[0018] Second, in this invention, the upper and lower hollow columns are connected and fixed with reinforcing bars using mechanical bolts. Then, the bonding and fixing plate is fixed to the upper and lower hollow columns using mechanical bolts. At the same time, the side end of the bonding and fixing plate is fixed to the first and second limiting components with screws. After the first and second limiting components are positioned, the first and second insertion templates are inserted and then fastened with fastening pins. After positioning, concrete can be poured through the pouring end seat. After waiting for the concrete to be poured, the bonding template is hinged to the upper template through a movable flipping shaft. The hydraulic telescopic rod on the transverse guide rod can extend, thereby pushing the docking hinge seat and the upper template to move, so that the upper template and the bonding template can flip to form a 90-degree angle for better positioning and to facilitate the subsequent curing treatment of concrete. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a first state diagram of the main body in this invention;

[0021] Figure 2 This is a second state diagram of the main body in this invention;

[0022] Figure 3 This is a third state diagram of the main body in this invention;

[0023] Figure 4 This is the fourth state diagram of the main body in this invention;

[0024] Figure 5 This is a structural diagram of the first embodiment of the fifth state of the main body in this invention;

[0025] Figure 6 This is a structural diagram of the second embodiment of the fifth state of the main body in this invention;

[0026] Figure 7 This is a structural diagram of the third embodiment of the fifth state of the main body in this invention;

[0027] Figure 8 This is a split view of the third embodiment of the fifth state of the main body in this invention;

[0028] Figure 9 This is a perspective view of the second mating casting structure in this invention;

[0029] Figure 10 This is a split view of the second mating casting structure in this invention;

[0030] Figure 11 This is a perspective view of the first limiting component in this invention.

[0031] In the diagram: 1-Longitudinal reinforcement, 2-Angle steel, 3-Outer perimeter stirrups, 4-Additional stirrups, 5-Concrete slab, 6-Hoop sleeve, 7-Reinforcing mesh, 8-Secondary additional stirrups, 9-Post-cast section, 10-Reinforcing cage, 11-First coordinating casting structure, 12-Second coordinating casting structure, 13-Upper hollow column, 14-Fitting fixing plate, 15-Fastening bolt, 16-Machine bolt, 17-Lower hollow column, 18-First limiting component, 19-Second limiting component, 20-First insertion template, 21-Second insertion template, 22-Positioning block, 23-Side seat, 24-Coordinating end frame, 25-Spring, 26-Transverse guide rod, 27-Hydraulic telescopic rod, 28-Fastening pin, 29-Connecting hinge seat, 30-Extension plate, 31-Casting end seat, 32-Upper template, 33-Modible flipping shaft, 34-Fitting template. Detailed Implementation

[0032] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0033] The invention will be further described below with reference to the accompanying drawings.

[0034] Example 1

[0035] like Figure 1-5 As shown, a precast concrete hollow column and its construction method of the present invention include longitudinal bars 1, angle steel 2, outer stirrups 3 and additional stirrups 4. The lower end of the additional stirrups 4 is tied and fixedly connected to the outer stirrups 3. The longitudinal bars 1 are tied and connected to the upper end of the outer stirrups 3. The angle steel 2 is placed on the upper end of the outer stirrups 3. A concrete slab 5 is poured between the outer stirrups 3 and the additional stirrups 4.

[0036] The concrete slab 5 can be folded and is positioned and fixed by the outer angle steel 2, which is fastened by the hoop 6.

[0037] The lower longitudinal reinforcement 1 protrudes and is fixed to the upper longitudinal reinforcement 1 by the steel mesh 7. The upper hollow column and the lower hollow column are connected by a post-cast section 9, and the upper hollow column and the lower hollow column are provided with a second additional stirrup 8 inside.

[0038] A construction method for precast concrete hollow columns:

[0039] S1. First, tie the steel mesh, arrange the angle steel, place the fabricated additional stirrups on top of the ordinary steel bars, then pour concrete and cure it. The ordinary steel bars are exposed at both ends of the thin plate.

[0040] S2. After the pouring is completed, remove the angle steel and start bending the stirrups. Fold the concrete slab up and insert additional longitudinal bars at the 135° stirrup bend to anchor the outer stirrups. Place angle steel at the four corners and fix it by rotating it 90° with the designed stirrup sleeves staggered from each other.

[0041] S3. Once prefabricated in the factory, the components can be hoisted and transported to the construction site.

[0042] S4. Secure the connection between the upper and lower precast columns, and finally pour the hollow area concrete, waiting for the concrete to fully harden.

[0043] The precast plant produces notched reinforced concrete slabs. After the concrete hardens, the slabs are folded to form precast hollow columns. The slabs contain all the steel bars required for the on-site reinforced concrete columns. The precast hollow columns are fixed and transported to the site using special equipment, hoisted into place, and then the upper and lower layers of steel bars are easily connected. Concrete is then poured in the middle of the precast hollow columns to achieve the quality requirements of assembled monolithic reinforced concrete columns.

[0044] The thin slabs produced in the factory with all the steel bars in the column and special structures have the following characteristics: the slab thickness is about 40mm, and steel mesh is placed according to the design (first place the stirrups, then place the longitudinal bars on the stirrups, and the protective layer of the stirrups reaches 25mm, and the longitudinal bars are partially exposed on the slab surface), additional stirrups, and notches are reserved through specially constructed angle steel. After the concrete hardens, the stirrups are bent at the notches, the thin slab is folded and fixed with special devices, thus forming a hollow column.

[0045] The additional stirrups have the following characteristics: the width of the additional stirrups is about half the width of the hollow column, and the height is about 2 / 3 of the side length of the hollow column. They restrain the two middle longitudinal bars on each side of the hollow column. Their function is to improve the shear resistance of the hollow column and provide restraint for the core concrete. By folding the thin plate, about 1 / 2 of the additional stirrups on the four sides overlap at the center of the hollow column, forming a square area that facilitates the pouring of core concrete using the pumping method.

[0046] The outer stirrups have 135° hooks at the ends: additional longitudinal bars are inserted at the notches at the ends of the stirrups formed after the thin plate is folded to anchor the outer stirrups, further enhancing the bond and anchorage of the outer stirrups and ensuring the safety and stability of the structure.

[0047] The four corner steels and hoops that fix the hollow column can make the hollow column into a whole, which is convenient for transportation and provides good support when pouring concrete. The hollow column is fixed by the well-designed hoops that are staggered by 90°. The hoops provide lifting points for the hollow column during hoisting, ensuring the yield of finished products during transportation and preventing bulging of the formwork when pouring core concrete.

[0048] The connection between upper and lower precast columns can be achieved through one of the following methods: cast-in-place concrete is used to ensure a good connection between the steel bars in the upper and lower columns, thereby achieving the goal of prefabricated integral construction.

[0049] The connection method between the upper and lower precast columns involves slightly bending the exposed vertical steel bars of the lower hollow column and inserting them into the gap in the middle of the upper hollow column to a certain depth (to meet the lap length requirement). Finally, concrete is poured into the hollow area. This method does not require formwork.

[0050] The working principle is as follows: During use, the user first ties and fixes the longitudinal reinforcement 1, the outer stirrups 3, and the additional stirrups 4. Simultaneously, the angle steel 2 is placed on the outer stirrups 3. Then, the concrete slab 5 is poured, forming the slab and creating a notch in the angle steel 2. The angle steel 2 is then removed, and the concrete slab 5 is flipped over. The outer side is fixed with the angle steel 2, and then the angle steel 2 is tightened using the hoop 6. Next, the upper and lower hollow columns are connected using the steel mesh 7, and finally, the post-cast section 9 is poured to form the final shape. Figure 1 Angle steel 2 in the design is a slotted angle steel, which facilitates the formation of a channel structure and makes it easy to fold. Figure 3 , Figure 4 Angle steel 2 in the text is ordinary angle steel, used only for fixing and completing the work.

[0051] Example 2

[0052] like Figure 6As shown, a specially made steel cage is inserted into the hollow columns of the upper and lower layers for connection. The size is slightly smaller than the original steel cage in the hollow columns of the upper and lower layers. This method does not require formwork. The steel cage 10 is fixed to the upper and lower hollow columns at the upper and lower ends respectively, and the steel cage 10 is connected to the post-cast section 9 in the transverse position.

[0053] In use, the user first ties and fixes the longitudinal reinforcement 1, the outer stirrups 3, and the additional stirrups 4. At the same time, the angle steel 2 is placed on the outer stirrups 3. Then, the concrete slab 5 is poured to form the concrete slab 5, which at the same time forms the notch of the angle steel 2. Then, the angle steel 2 is removed, and the concrete slab 5 is flipped over. The outside is fixed by the angle steel 2. Then, the angle steel 2 is fastened by the hoop 6. At this time, the steel cage 10 is connected and placed between the upper and lower hollow columns. It is fixed by tying the steel bars together. Then, the post-cast section 9 is poured to form the structure.

[0054] Example 3

[0055] like Figures 7-11 As shown, the lower end of the upper hollow column 13 is connected by a mechanical bolt 16. The lower end of the mechanical bolt 16 is fixed to the lower hollow column 17 at the lower end position. The mechanical bolt 16 serves to fix the upper and lower longitudinal ribs 1 together. The upper hollow column 13 and the lower hollow column 17 are provided with fitting and fixing plates 14 at their front and rear ends. The fitting and fixing plates 14 are fixed to the upper hollow column 13 and the lower hollow column 17 respectively by fastening bolts 15. The side ends of the fitting and fixing plates 14 and the two ends of the fitting and fixing plates 14 are fastened with screws to the first matching casting structure 11 and the second matching casting structure 12.

[0056] The second co-casting structure 12 includes a first limiting component 18 and a second limiting component 19. The first limiting component 18 and the second limiting component 19 have the same structure and are symmetrically arranged. A first interlocking template 20 and a second interlocking template 21 are inserted between the first limiting component 18 and the second limiting component 19. The first interlocking template 20 and the second interlocking template 21 are inserted later. The first interlocking template 20, the second interlocking template 21, the first limiting component 18, and the second limiting component 19 constitute a sealed casting structure. The longitudinal reinforcement 1, the outer hoop 3, and the additional hoop 4 are tied and fixed. At the same time, the angle steel 2 is placed on the outer hoop 3. Then the concrete slab 5 is poured, so that the concrete slab 5 is formed, and the notch of the angle steel 2 is formed. Then the angle steel 2 is removed, and the concrete slab 5 is flipped over. The outside is fixed by the angle steel 2. After fixing, the angle steel 2 is fastened and connected by the clamp 6. First, the upper hollow column 13 and the lower hollow column 17 are fastened together by the mechanical bolt 16 to support the structure. At the same time, the bonding and fixing plate 14 is installed by the fastening bolt 15. The bonding and fixing plate 14 is fixed to the upper hollow column 13 by the upper end of the fastening bolt 15 and to the lower hollow column 17 by the lower end of the fastening bolt 15. Then, the first mating casting structure 11 and the second mating casting structure 12 are fixed to the bonding and fixing plate 14 to achieve connection and fastening. The first limiting component 18 and the second limiting component 19 in the second mating casting structure 12 are fixed to the bonding and fixing plate 14 by the positioning nail. At the same time, the first limiting component 18 and the second limiting component 19 are fixed to the upper hollow column 13 and the lower hollow column 17 in the lateral position by the positioning screw.

[0057] The first limiting component 18 includes a positioning block 22, a side seat 23, a mating end bracket 24, a spring 25, a transverse guide rod 26, a hydraulic telescopic rod 27, a fastening pin 28, a mating hinge seat 29, an extension plate 30, a casting end bracket 31, an upper template 32, a movable flipping shaft 33, and a fitting template 34. The front and rear ends of the positioning block 22 are fixedly connected to the side seat 23, the mating end bracket 24 is fixedly connected to the side seat 23, and the mating end bracket 24 is elastically connected to the mating end bracket 24, with the lower end of the spring 25 elastically connected to the upper template 32. Next, a fitting template 34 is hinged to the upper left side of the upper template 32. The upper end of the fitting template 34 is fixed to the positioning block 22. A transverse guide rod 26 is fixedly connected to the lower right side of the positioning block 22. A hydraulic telescopic rod 27 is hinged to the transverse guide rod 26. The lower end of the hydraulic telescopic rod 27 is hinged to the docking hinge seat 29. The docking hinge seat 29 is fixedly connected to the upper template 32. The upper template 32 is fixed to the first insertion template 20 by a fastening pin 28. An extension plate 30 is fixedly connected to the upper side of the upper template 32. A casting end seat 31 is fixedly provided on the extension plate 30, and the casting end seat 31 is connected to the extension plate 30. The fitting template 34 and the upper template 32 are hinged together by a movable flipping shaft 33. The hydraulic telescopic rod 27 on the transverse guide rod 26 extends and adjusts, thereby pushing the upper template 32 to move through the docking hinge seat 29. This allows the upper template 32 to swing and adjust with the fitting template 34 through the movable flipping shaft 33, so that the upper template 32 reaches the bottom position. The spring 25, in conjunction with the end frame 24, limits the movement of the upper mold. After the buffer protection of plate 32, the first insertion template 20 and the second insertion template 21 are inserted through the extension plate 30 and the lower end of the upper template 32. Then, the fastening pin 28 is tightened to fix the first insertion template 20 and the second insertion template 21. After positioning, the concrete is poured through the pouring end seat 31, so that the concrete is introduced through the extension plate 30 and the pouring end seat 31 and cured in the first limiting component 18, the second limiting component 19, the first insertion template 20 and the second insertion template 21.

[0058] The positioning block 22 is provided with positioning screws, which pass through the positioning block 22 and are fixedly connected to the upper hollow column 13. The side seat 23 is provided with positioning nails, which are fixedly connected to the bonding and fixing plate 14 through the positioning nails. The first insertion template 20 and the second insertion template 21 are inserted through the extension plate 30 and the lower end of the upper template 32.

[0059] The upper end of the hydraulic telescopic rod 27 is hinged to the transverse guide rod 26, and the lower end of the hydraulic telescopic rod 27 is hinged to the docking hinge seat 29. When the hydraulic telescopic rod 27 extends, the upper template 32 rotates and adjusts with the fitting template 34 through the movable flipping shaft 33.

[0060] Grouting treatment is performed on the sealing space of the first limiting component 18, the second limiting component 19, the first insertion template 20, and the second insertion template 21 at the casting end seat 31. The side ends of the first insertion template 20 and the second insertion template 21 also need to be sealed by the template.

[0061] In use, the longitudinal reinforcement 1, the outer hoop 3, and the additional hoop 4 are first tied and fixed. Angle steel 2 is placed on the outer hoop 3. Then, the concrete slab 5 is poured, forming the slab and creating a notch in the angle steel 2. The angle steel 2 is then removed, and the concrete slab 5 is flipped over. The outer side is fixed with angle steel 2, and then the angle steel 2 is fastened using hoop sleeves 6. First, the upper hollow column 13 and the lower hollow column 17 are fastened together with mechanical bolts 16 for structural support. Simultaneously, the bonding and fixing plate 14 is installed using fastening bolts 15. The upper end of the bonding and fixing plate 14 is fixed to the upper hollow column 13 using the fastening bolts 15, and the lower end is fixed to the lower hollow column 17 using the fastening bolts 15. Then, the first co-casting structure 11 and the second co-casting structure 12 are fixed to the bonding and fixing plate 14 for secure connection. The first limiting component 18 and the second limiting component 19 within the second co-casting structure 12 are fixed to the bonding and fixing plate using positioning pins. Plate 14 is fixed, and the first limiting component 18 and the second limiting component 19 are fixed laterally to the upper hollow column 13 and the lower hollow column 17 by positioning screws. Then, the hydraulic telescopic rod 27 on the transverse guide rod 26 is extended and adjusted, thereby pushing the upper template 32 to move through the docking hinge seat 29. The upper template 32 swings and adjusts with the fitting template 34 through the movable flip shaft 33, so that the upper template 32 reaches the bottom position. The spring 25 is limited by the end frame 24 to provide buffer protection for the upper template 32. Then, the first insertion template 20 and the second insertion template 21 are inserted through the extension plate 30 and the lower end of the upper template 32. Then, the fastening pin shaft 28 is tightened to fix the first insertion template 20 and the second insertion template 21. After positioning, the concrete is poured through the pouring end seat 31, so that the concrete is introduced through the extension plate 30 and the pouring end seat 31 and cured in the first limiting component 18, the second limiting component 19, the first insertion template 20, and the second insertion template 21.

[0062] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A precast hollow concrete column, characterized in that: It includes longitudinal reinforcement (1), angle steel (2), outer hoop (3) and additional hoop (4). The lower end of the additional hoop (4) is tied and fixed to the outer hoop (3). The longitudinal reinforcement (1) is tied and connected to the upper end of the outer hoop (3). The angle steel (2) is placed at the upper end of the outer hoop (3). A concrete slab (5) is poured between the outer hoop (3) and the additional hoop (4). The concrete slab (5) can be folded and is positioned and fixed by the outer angle steel (2), and the outer angle steel (2) is fastened by the hoop (6); The lower longitudinal bar (1) protrudes and is fixed to the upper longitudinal bar (1) through the steel mesh (7). The upper hollow column (13) and the lower hollow column (17) are connected by a post-cast section (9) and the upper hollow column (13) and the lower hollow column (17) are provided with a second additional stirrup (8). The upper and lower ends of the steel cage (10) are fixed to the upper hollow column (13) and the lower hollow column (17) respectively, and the steel cage (10) is connected to the post-cast section (9) in the transverse position. The lower end of the upper hollow column (13) is connected by a mechanical bolt (16). The lower end of the mechanical bolt (16) is fixed to the lower hollow column (17) at the lower end position. The mechanical bolt (16) serves to fix the longitudinal ribs (1) on both sides. The upper hollow column (13) and the lower hollow column (17) are provided with fitting and fixing plates (14) at the front and rear ends. The bonding and fixing plate (14) is fixed to the upper hollow column (13) and the lower hollow column (17) respectively by fastening bolts (15). The side end of the bonding and fixing plate (14) and the two ends of the bonding and fixing plate (14) are fastened to the first matching casting structure (11) and the second matching casting structure (12) by screws. The second co-casting structure (12) includes a first limiting component (18) and a second limiting component (19). The first limiting component (18) and the second limiting component (19) have the same structure and are symmetrically arranged. A first insertion template (20) and a second insertion template (21) are inserted between the first limiting component (18) and the second limiting component (19). The first insertion template (20) and the second insertion template (21) are inserted later. The first insertion template (20), the second insertion template (21), the first limiting component (18), and the second limiting component (19) constitute a sealed casting structure.

2. A precast hollow concrete column according to claim 1, characterized in that: The first limiting component (18) includes a positioning block (22), a side seat (23), a mating end frame (24), a spring (25), a transverse guide rod (26), a hydraulic telescopic rod (27), a fastening pin (28), a docking hinge seat (29), an extension plate (30), a casting end seat (31), an upper template (32), a movable flipping shaft (33), and a fitting template (34). The front and rear ends of the positioning block (22) are fixedly connected to the side seats (23).

3. A precast hollow concrete column according to claim 2, characterized in that: A mating end frame (24) is fixedly connected to the side seat (23). A spring (25) is elastically connected to the mating end frame (24), and the lower end of the spring (25) is elastically connected to the upper template (32). A fitting template (34) is hinged to the upper left side of the upper template (32). The upper end of the fitting template (34) is fixed to the positioning block (22). A horizontal guide rod (26) is fixedly connected to the lower right side of the positioning block (22).

4. A precast hollow concrete column according to claim 3, characterized in that: A hydraulic telescopic rod (27) is hinged on the transverse guide rod (26). The lower end of the hydraulic telescopic rod (27) is hinged to the docking hinge seat (29). The docking hinge seat (29) is fixedly connected to the upper template (32). The upper template (32) is fixed to the first insertion template (20) by a fastening pin (28). An extension plate (30) is fixedly connected to the upper side of the upper template (32). A casting end seat (31) is fixedly provided on the extension plate (30), and the casting end seat (31) and the extension plate (30) are connected through each other. The fitting template (34) and the upper template (32) are hinged together by a movable flipping shaft (33).

5. A construction method for a precast hollow concrete column, using the precast hollow concrete column described in claim 4, characterized in that, Includes the following steps: S1. First, tie the steel mesh, arrange the angle steel, place the fabricated additional stirrups on top of the ordinary steel bars, then pour concrete and cure it. The ordinary steel bars are exposed at both ends of the thin plate. S2. After the pouring is completed, remove the angle steel and start bending the stirrups. Fold the concrete slab up and insert additional longitudinal bars at the 135° stirrup bend to anchor the outer stirrups. Place angle steel at the four corners and fix it by rotating it 90° with the designed stirrup sleeves staggered from each other. S3. Once prefabricated in the factory, the components can be hoisted and transported to the construction site. S4. Secure the connection between the upper and lower precast columns, and finally pour the hollow area concrete, waiting for the concrete to fully harden.

Images