Prefabricated concrete hollow column and construction method thereof

Abstract

The invention relates to the technical field of prefabricated concrete hollow columns, in particular to a prefabricated concrete hollow column and a construction method thereof.The prefabricated concrete hollow column comprises longitudinal bars, angle steel, peripheral stirrups and additional stirrups, the lower ends of the additional stirrups are fixedly connected with the peripheral stirrups in a binding mode, and the longitudinal bars are connected to the upper ends of the peripheral stirrups in a binding mode; the angle steel is placed at the upper ends of the peripheral stirrups, concrete slabs are arranged at the positions, between the peripheral stirrups and the additional stirrups, of the peripheral stirrups and the additional stirrups in a pouring mode, the concrete slabs can be folded and are positioned and fixed through the angle steel on the outer side, the angle steel on the outer side is fixedly connected through hoop sleeves, and longitudinal bars at the lower end protrude and are fixed to longitudinal bars at the upper end through reinforcing meshes. The centers of the upper-layer hollow column and the lower-layer hollow column are connected with a post-pouring section in a filling mode, and second additional stirrups are arranged in the upper-layer hollow column and the lower-layer hollow column. Through the arrangement of the structure, machining of the prefabricated concrete hollow column is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of precast concrete hollow columns, in particular to a precast concrete hollow column and a construction method thereof. Background Art

[0002] The precast concrete hollow column includes two parts, the precast and the cast-in-place. The thin plate of special structure is a convenient and efficient precast concrete hollow column formed by simple rolling and folding. After the precast column is installed in place on site, concrete is poured in the formed cavity, so that the cast-in-place part and the precast part are subjected to force together, thus forming a concrete column. The upper and lower layers of precast columns are connected into a whole through local cast-in-place concrete to form an "assembled integral concrete column structure system". Combined with the precast structure, it has the advantages of fast construction speed, self-weight and good structural integrity. The existing precast columns have the problems of heavy self-weight, difficulty in lifting, difficulty in connecting the upper and lower columns through steel bars, and difficulty in installation. In view of the above problems, a precast concrete hollow column is proposed to solve the above problems. Summary of the invention

[0003] In view of the problems in the prior art, the present invention provides a precast concrete hollow column and a construction method thereof.

[0004] The technical solution adopted by the present invention to solve the technical problem is: a precast concrete hollow column and a construction method thereof, comprising longitudinal reinforcement, angle steel, peripheral stirrups and additional stirrups, wherein the lower end of the additional stirrups is tied and fixedly connected with the peripheral stirrups, the longitudinal reinforcement is tied and connected to the upper end of the peripheral stirrups, and the angle steel is placed on the upper end of the peripheral stirrups, and a concrete slab is cast between the peripheral stirrups and the additional stirrups;

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

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

[0007] Specifically, the upper and lower ends of the steel cage are respectively fixed to the upper hollow column and the lower hollow column, and a post-casting section is cast and connected to the lateral position of the steel cage.

[0008] Specifically, the lower end of the upper hollow column is connected by a mechanical bolt, and the lower end of the mechanical bolt is fixed to the lower hollow column at the lower end position, and the mechanical bolt plays a role in docking and fixing the upper and lower longitudinal reinforcements. The front and rear ends of the upper hollow column and the lower hollow column are provided with fitting fixing plates, and the fitting fixing plates are respectively fixed to the upper hollow column and the lower hollow column by fastening bolts. The side ends of the fitting fixing plates and the two ends of the fitting fixing plates are fastened with the first matching casting structure and the second matching casting structure by screws.

[0009] Specifically, the second matching 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 plug-in template and a second plug-in template are inserted between the first limiting component and the second limiting component. The first plug-in template and the second plug-in template are inserted later. The first plug-in template, the second plug-in 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, a side seat, a matching end frame, a spring, a transverse guide rod, a hydraulic telescopic rod, a fastening pin, a butt hinge seat, an extension plate, a casting end seat, an upper template, a movable flip axis and a bonding template, the front and rear ends of the positioning block are fixedly connected with side seats, the side seat is fixedly connected with a matching end frame, the matching end frame is elastically connected with a spring, and the lower end of the spring is elastically connected to the upper template, the left upper end of the upper template is hinged with a bonding template, the upper end of the bonding template is fixed to the positioning block, the right lower end of the positioning block is fixedly connected with a transverse guide rod, the transverse guide rod is hinged with a hydraulic telescopic rod, the lower end of the hydraulic telescopic rod is hinged with the butt hinge seat, the butt hinge seat is fixedly connected to the upper template, the upper template is fixed to the first plug-in template through a fastening pin, the upper part of the side end of the upper template is fixedly connected with an extension plate, the extension plate is fixed with a casting end seat, and the casting end seat and the extension plate are connected, and the bonding template and the upper template are hinged through a movable flip axis.

[0011] A construction method for a precast concrete hollow column comprises the following steps:

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

[0013] S2. After pouring, remove the angle steel and start bending the stirrups. Fold the concrete sheet and insert additional longitudinal reinforcement to anchor the peripheral stirrups at the 135° stirrup bend. Put the angle steels at the four corners and fix them with designed hoop sleeves staggered and rotated 90°.

[0014] S3. After prefabrication in the factory, it can be hoisted and transported to the construction site;

[0015] S4. Fix the upper and lower precast columns together, and finally pour concrete in the hollow area and wait for the concrete to harden fully.

[0016] Beneficial effects of the present invention:

[0017] First, the high-efficiency prefabricated concrete hollow columns formed by folding in the present invention are used to solve the problems of heavy weight and complicated on-site operations of conventional prefabricated columns. The products corresponding to this technology have the advantages of adjustable quality, easy lifting and transportation, no need to tie steel bars and support formwork on site, low production cost, and high construction efficiency.

[0018] Second, the present invention connects and fixes the steel bars between the upper hollow column and the lower hollow column by mechanical bolts, and then fixes the fitting fixing plate to the upper hollow column and the lower hollow column by mechanical bolts, and at the same time, the side ends of the fitting fixing plate are fixed to the first limiting component and the second limiting component by screws. After the first limiting component and the second limiting component are positioned, the first plug-in template and the second plug-in template are inserted, and then they are fastened and connected by tightening pins. After the positioning is completed, concrete can be poured through the pouring end seat, and then the pouring of concrete can be waited. The fitting template is hinged with the upper template by a movable flip axis, and the hydraulic telescopic rod on the transverse guide rod can be extended, thereby pushing the hinge seat and the upper template to move, so that the upper template and the fitting template are flipped, which is convenient for forming a 90-degree angle, better positioning, and convenient for subsequent concrete curing treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 is a first state diagram of the subject in the present invention;

[0021] Figure 2 is a second state diagram of the subject in the present invention;

[0022] Figure 3 is a third state diagram of the subject in the present invention;

[0023] Figure 4 is a fourth state diagram of the subject in the present invention;

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

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

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

[0027] Figure 8 It is a disassembled diagram of the third embodiment of the main body in the fifth state of the present invention;

[0028] Fig. 9 It is a three-dimensional diagram of the second matching casting structure in the present invention;

[0029] Fig.10 It is a disassembled diagram of the second matching casting structure in the present invention;

[0030] Fig.11 It is a three-dimensional diagram of the first limiting component in the present invention.

[0031] In the figure: 1-longitudinal reinforcement, 2-angle steel, 3-outer stirrups, 4-additional stirrups, 5-concrete slab, 6-hoop, 7-steel mesh, 8-second additional stirrups, 9-post-casting section, 10-steel cage, 11-first matching casting structure, 12-second matching casting structure, 13-upper hollow column, 14-fitting fixing plate, 15-fastening bolts, 16-mechanical bolts, 17-lower hollow column, 18-first limiting component, 19-second limiting component, 20-first plug-in template, 21-second plug-in template, 22-positioning block, 23-side seat, 24-matching end frame, 25-spring, 26-lateral guide rod, 27-hydraulic telescopic rod, 28-fastening pin shaft, 29-butt hinge seat, 30-extension plate, 31-casting end seat, 32-upper template, 33-movable flip axis, 34-fitting template. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0033] The present invention is further described below in conjunction with the accompanying drawings.

[0034] Example 1

[0035] like Figure 1-5 As shown, a precast concrete hollow column and a construction method thereof of the present invention comprises longitudinal reinforcement 1, angle steel 2, peripheral stirrups 3 and additional stirrups 4, the lower end of the additional stirrups 4 is tied and fixedly connected with the peripheral stirrups 3, the longitudinal reinforcement 1 is tied and connected to the upper end of the peripheral stirrups 3, and the angle steel 2 is placed on the upper end of the peripheral stirrups 3, and the peripheral stirrups 3 and the additional stirrups 4 are cast with a concrete slab 5 between the angle steels 2;

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

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

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

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

[0040] S2. After pouring, remove the angle steel and start bending the stirrups. Fold the concrete sheet and insert additional longitudinal reinforcement to anchor the peripheral stirrups at the 135° stirrup bend. Put the angle steels at the four corners and fix them with designed hoop sleeves staggered and rotated 90°.

[0041] S3. After prefabrication in the factory, it can be hoisted and transported to the construction site;

[0042] S4. Fix the upper and lower precast columns together, and finally pour concrete in the hollow area and wait for the concrete to harden fully.

[0043] Reinforced concrete sheets with notches are produced in the prefabrication plant. After the concrete hardens, the sheets are folded to form prefabricated hollow columns. The sheets contain all the steel bars required for the on-site reinforced concrete columns. The prefabricated hollow columns are fixed by special devices and transported to the site. They are hoisted into place, and after convenient connection of the upper and lower layers of steel bars, concrete is poured in the middle of the prefabricated hollow columns to meet the quality requirements of assembled integral reinforced concrete columns.

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

[0045] The additional stirrups have the following characteristics: the width of the additional stirrups is about half of the width of the hollow column, and the height is about 2 / 3 of the side length of the hollow column. They constrain 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 constraints on the core concrete. By folding the thin plate, about 1 / 2 of the additional stirrups on the four sides overlap in the center of the hollow column, and the square area formed is convenient for pouring core concrete by pumping method.

[0046] The ends of the peripheral stirrups are equipped with 135° hooks: additional longitudinal reinforcement is inserted into the notch at the ends of the stirrups formed after the thin plate is folded to anchor the peripheral stirrups, further enhancing the bonding and anchoring of the peripheral stirrups to ensure the safety and stability of the structure.

[0047] The four-corner angle steels and hoops used to fix the hollow column can make the hollow column form an integral whole for easy transportation and provide good support when pouring concrete. The hollow column is fixed with designed hoops staggered 90° from each other. The hoops provide lifting points for the hollow column during lifting, ensuring the yield during transportation and preventing mold expansion when pouring core concrete.

[0048] The connection between the upper and lower prefabricated columns can be achieved through one of the following schemes, which can achieve good connection of the steel bars in the upper and lower columns through cast-in-place concrete, thus achieving the goal of assembly as a whole:

[0049] The connection method between the upper and lower prefabricated columns is to slightly bend the exposed steel bars in the vertical direction of the lower hollow column and extend them into the gap in the middle of the upper hollow column to a certain depth (to meet the steel bar lap length), and finally pour the concrete in the hollow area. This method does not require formwork support. The exposed steel bars in the vertical direction of the lower hollow column are slightly bent and extended into the gap in the middle of the upper hollow column to a certain depth (to meet the steel bar lap length), and finally pour the concrete in the hollow area.

[0050] The working principle is as follows: when in use, the user first binds and fixes the longitudinal reinforcement 1, the outer stirrups 3, and the additional stirrups 4, and at the same time places the angle steel 2 on the outer stirrups 3, and then pours the concrete slab 5 to form the concrete slab 5 and form a notch in the angle steel 2. Then the angle steel 2 is removed and the concrete slab 5 is turned over. The outer side is fixed by the angle steel 2, and then the angle steel 2 is fastened and connected by the hoop 6. Then the upper and lower hollow columns are connected by the steel mesh 7, and then the casting is carried out through the post-casting section 9. Figure 1 The angle steel 2 in the figure is a slotted angle steel, which is convenient for forming a slot structure and folding. Figure 3 , Figure 4 The angle steel 2 in the figure is a common angle steel, which is only used for fixing the processing work to complete the work.

[0051] Example 2

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

[0053] When in use, the user first binds and fixes the longitudinal reinforcement 1, the outer stirrups 3, and the additional stirrups 4, and at the same time places the angle steel 2 on the outer stirrups 3, and then pours the concrete slab 5 to form the concrete slab 5 and form a notch in the angle steel 2. The angle steel 2 is then removed and the concrete slab 5 is turned over. The outer side is fixed by the angle steel 2, and then the angle steel 2 is fastened and connected by the hoop 6. At this time, the steel cage 10 is connected and located between the upper and lower hollow columns, and is tied and fixed by the steel bars, and then the post-casting section 9 is poured to form the concrete slab.

[0054] Example 3

[0055] like Figure 7-Figure 11 As shown, the lower end of the upper hollow column 13 is connected by a mechanical bolt 16, and 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 plays a role in docking and fixing the upper and lower longitudinal reinforcements 1. The front and rear ends of the upper hollow column 13 and the lower hollow column 17 are provided with a fitting fixing plate 14, and the fitting fixing plate 14 is respectively fixed to the upper hollow column 13 and the lower hollow column 17 by fastening bolts 15. The side end of the fitting fixing plate 14 and the two ends of the fitting fixing plate 14 are fastened with the first matching casting structure 11 and the second matching casting structure 12 by screws.

[0056] The second matching 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 plug-in template 20 and a second plug-in template 21 are inserted between the first limiting component 18 and the second limiting component 19. The first plug-in template 20 and the second plug-in template 21 are inserted later. The first plug-in template 20, the second plug-in template 21, the first limiting component 18, and the second limiting component 19 constitute a sealed casting structure. The longitudinal reinforcement 1, the outer stirrups 3, and the additional stirrups 4 are tied and fixed, and the angle steel 2 is placed on the outer stirrups 3. Then, the concrete slab 5 is cast, so that the concrete slab 5 is formed and a notch in the angle steel 2 is formed. Then, the angle steel 2 is removed, and the concrete slab 5 is turned over, and the outer side is fixed by the angle steel 2. The angle steel 2 is fixed, and then the hoop 6 is used to fasten the angle steel 2. First, the upper hollow column 13 and the lower hollow column 17 are fastened and connected by mechanical bolts 16 to support the structure. At the same time, the fitting fixing plate 14 is installed by fastening bolts 15. The fitting fixing plate 14 is fixed to the upper hollow column 13 by the upper end of the fastening bolts 15, and the fitting fixing plate 14 is fixed to the lower hollow column 17 by the lower end of the fastening bolts 15. Then, the first matching casting structure 11 and the second matching casting structure 12 are fixed to the fitting fixing plate 14 to achieve connection and fastening. The first limiting component 18 and the second limiting component 19 in the second matching casting structure 12 are fixed to the fitting fixing plate 14 by positioning nails. At the same time, the lateral positions of 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 by positioning screws.

[0057] The first limiting component 18 includes a positioning block 22, a side seat 23, a matching end frame 24, a spring 25, a transverse guide rod 26, a hydraulic telescopic rod 27, a fastening pin shaft 28, a butt hinge seat 29, an extension plate 30, a casting end seat 31, an upper template 32, a movable flip shaft 33 and a fitting template 34. The front and rear ends of the positioning block 22 are fixedly connected with the side seat 23, the side seat 23 is fixedly connected with the matching end frame 24, the matching end frame 24 is elastically connected with the spring 25, and the lower end of the spring 25 is elastically connected to the upper template 32. The upper left end of the upper template 32 is hinged with a fitting template 34, the upper end of the fitting template 34 is fixed to the positioning block 22, the lower right end of the positioning block 22 is fixedly connected with a transverse guide rod 26, the transverse guide rod 26 is hinged with a hydraulic telescopic rod 27, the lower end of the hydraulic telescopic rod 27 is hinged with a butt hinge seat 29, the butt hinge seat 29 is fixedly connected to the upper template 32, the upper template 32 is fixed to the first plug-in template 20 through a fastening pin 28, and the upper side end of the upper template 32 is fixedly connected with an extension plate 30. A casting end seat 31 is fixed on the extension plate 30, and the casting end seat 31 is connected with the extension plate 30. The fitting template 34 and the upper template 32 are hingedly arranged by a movable flip shaft 33. The hydraulic telescopic rod 27 on the transverse guide rod 26 is extended and adjusted, so as to push the upper template 32 to move through the butt hinge seat 29, so that the upper template 32 is swung and adjusted with the fitting template 34 through the movable flip shaft 33, so that the upper template 32 reaches the bottom position, and the spring 25 is limited by the end frame 24 to enable the upper mold to be moved. The buffer protection of the plate 32 is then used, and the first plug-in template 20 and the second plug-in template 21 are inserted through the lower end of the extension plate 30 and the upper template 32, and then the tightening pin 28 is screwed to fix the first plug-in template 20 and the second plug-in template 21. After the positioning is completed, pouring is carried out through the pouring end seat 31, so that concrete is introduced through the extension plate 30 and the pouring end seat 31, and solidified in the first limiting component 18, the second limiting component 19, the first plug-in template 20, and the second plug-in template 21.

[0058] The positioning block 22 is provided with a positioning screw, which passes through the positioning block 22 and is fixedly connected to the upper hollow column 13. The side seat 23 is provided with a positioning pin, and the side seat 23 is fixedly connected to the fitting fixing plate 14 through the positioning pin. The first plug-in template 20 and the second plug-in template 21 are plugged in through the lower end of the extension plate 30 and 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. The hydraulic telescopic rod 27 is extended, and the upper template 32 is rotated and adjusted with the fitting template 34 through the movable flip shaft 33.

[0060] The casting end seat 31 is subjected to grouting treatment of the sealed space of the first limiting component 18, the second limiting component 19, the first plug-in template 20, and the second plug-in template 21. The side ends of the first plug-in template 20 and the second plug-in template 21 also need to be sealed by the template;

[0061] When in use, firstly, the longitudinal reinforcement 1, the outer stirrups 3 and the additional stirrups 4 are tied and fixed, and the angle steel 2 is placed on the outer stirrups 3, and then the concrete slab 5 is poured to shape the concrete slab 5 and form a notch in the angle steel 2. Then the angle steel 2 is removed and the concrete slab 5 is turned over and fixed on the outside by the angle steel 2. Then the angle steel 2 is fastened and connected by the hoop 6. First, the upper hollow column 13 and the lower hollow column 17 are fastened and connected by mechanical bolts 16 to support the structure. At the same time, the fitting fixing plate 14 is installed by fastening bolts 15. The fitting fixing plate 14 is fixed to the upper hollow column 13 by the upper end of the fastening bolts 15, and the fitting fixing plate 14 is fixed to the lower hollow column 17 by the lower end of the fastening bolts 15. Then, the first matching casting structure 11 and the second matching casting structure 12 are fixed to the fitting fixing plate 14 to achieve connection and fastening. The first limiting component 18 and the second limiting component 19 in the second matching casting structure 12 are fixed to the fitting fixing plate 14 by positioning nails. The plate 14 is fixed, and the lateral positions of the first limiting component 18 and the second limiting component 19 are fixed with the upper hollow column 13 and the lower hollow column 17 by positioning screws. Then, the hydraulic telescopic rod 27 on the lateral guide rod 26 is extended and adjusted, thereby pushing the upper template 32 to move through the docking hinge seat 29, so that the upper template 32 is swung and adjusted with the fitting template 34 through the movable flip shaft 33, so that the upper template 32 reaches the bottom position, and the spring 25 is limited by the matching end frame 24 to provide buffering protection for the upper template 32. Then, the first plug-in template 20 and the second plug-in template 21 are inserted through the extension plate 30 and the lower end of the upper template 32, and then the tightening pin 28 is screwed to fix the first plug-in template 20 and the second plug-in template 21. After positioning is completed, pouring is carried out through the pouring end seat 31, so that concrete is introduced through the extension plate 30 and the pouring end seat 31, and solidified in the first limiting component 18, the second limiting component 19, the first plug-in template 20, and the second plug-in template 21.

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

Claims

1. A precast concrete hollow column, characterized in that: It comprises longitudinal reinforcement (1), angle steel (2), peripheral stirrups (3) and additional stirrups (4), wherein the lower end of the additional stirrups (4) is tied and fixedly connected to the peripheral stirrups (3), the longitudinal reinforcement (1) is tied and connected to the upper end of the peripheral stirrups (3), and the angle steel (2) is placed on the upper end of the peripheral stirrups (3), and a concrete slab (5) is cast between the peripheral stirrups (3) and the additional stirrups (4) at the position between the angle steel (2); The concrete slab (5) can be folded and positioned and fixed by an outer angle steel (2), and the outer angle steel (2) is fastened and connected by a hoop (6).

2. A precast concrete hollow column according to claim 1, characterized in that: The longitudinal reinforcement (1) at the lower end protrudes and is fixed to the longitudinal reinforcement (1) at the upper end through a steel mesh (7); a post-casting section (9) is connected to the center of the upper hollow column and the lower hollow column, and a second additional stirrup (8) is provided inside the upper hollow column and the lower hollow column.

3. The precast concrete hollow column according to claim 1, characterized in that: The upper and lower ends of the steel cage (10) are respectively fixed to the upper hollow column and the lower hollow column, and a post-casting section (9) is cast and connected to the steel cage (10) at a lateral position.

4. The precast concrete hollow column according to claim 1, characterized in that: The lower end of the upper hollow column (13) is connected by a mechanical bolt (16), and 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) plays a role in butting and fixing the upper and lower longitudinal ribs (1). The front and rear ends of the upper hollow column (13) and the lower hollow column (17) are provided with fitting fixing plates (14).

5. The precast concrete hollow column according to claim 4, characterized in that: The fitting fixing plate (14) is respectively fixed to the upper hollow column (13) and the lower hollow column (17) by means of fastening bolts (15); the side ends of the fitting fixing plate (14) and the two ends of the fitting fixing plate (14) are fastened with a first matching casting structure (11) and a second matching casting structure (12) by means of screws.

6. The precast concrete hollow column according to claim 5, characterized in that: The second matching casting structure (12) comprises 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 plug-in template (20) and a second plug-in template (21) are inserted between the first limiting component (18) and the second limiting component (19); the first plug-in template (20) and the second plug-in template (21) are inserted later; the first plug-in template (20), the second plug-in template (21), the first limiting component (18) and the second limiting component (19) constitute a sealed casting structure.

7. The precast concrete hollow column according to claim 5, characterized in that: The first limiting component (18) comprises a positioning block (22), a side seat (23), a matching end frame (24), a spring (25), a transverse guide rod (26), a hydraulic telescopic rod (27), a fastening pin shaft (28), a butt hinge seat (29), an extension plate (30), a casting end seat (31), an upper template (32), a movable flip shaft (33) and a fitting template (34), and the front and rear ends of the positioning block (22) are fixedly connected to the side seat (23).

8. The precast concrete hollow column according to claim 7, characterized in that: The side seat (23) is fixedly connected to a matching end frame (24), the matching end frame (24) is elastically connected to a spring (25), and the lower end of the spring (25) is elastically connected to an upper template (32), a fitting template (34) is hingedly provided at the left upper end of the upper template (32), the upper end of the fitting template (34) is fixed to a positioning block (22), and a transverse guide rod (26) is fixedly connected to the right lower end of the positioning block (22).

9. The precast concrete hollow column according to claim 8, characterized in that: A hydraulic telescopic rod (27) is hingedly provided on the transverse guide rod (26), the lower end of the hydraulic telescopic rod (27) is hingedly provided with a butt hinge seat (29), the butt hinge seat (29) is fixedly connected to an upper template (32), the upper template (32) is fixed to the first plug-in template (20) via a fastening pin shaft (28), an extension plate (30) is fixedly connected to the upper side end 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, and the fitting template (34) and the upper template (32) are hingedly provided via a movable flip shaft (33).

10. A construction method for a precast concrete hollow column, using the precast concrete hollow column according to claim 9, characterized in that: The following steps are involved: S1. First tie the steel mesh, arrange the angle steel, place the prepared additional stirrups on the ordinary steel bars, then pour the concrete and perform curing. The ordinary steel bars are exposed at both ends of the thin plate; S2. After pouring, remove the angle steel and start bending the stirrups. Fold the concrete sheet and insert additional longitudinal reinforcement to anchor the peripheral stirrups at the 135° stirrup bend. Put the angle steels at the four corners and fix them with designed hoop sleeves staggered and rotated 90°. S3. After prefabrication in the factory, it can be hoisted and transported to the construction site; S4. Fix the upper and lower precast columns together, and finally pour concrete in the hollow area and wait for the concrete to harden fully.

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