A prefabricated beamless floor slab column structure connected with high-strength bolts and its construction method

Abstract

The present invention discloses a prefabricated beamless floor slab column structure connected by high-strength bolts and a construction method thereof, comprising a fully prefabricated floor slab and prefabricated columns supported on the lower surface of the fully prefabricated floor slab; the prefabricated columns are reinforced concrete columns, the top of the prefabricated columns are provided with column top corrugations, and column longitudinal bars extend from the top of the prefabricated columns; the fully prefabricated floor slab is a rectangular reinforced concrete floor slab, and a pre-buried metal corrugated pipe is provided in the middle of the fully prefabricated floor slab vertically penetrating along the thickness direction; U-shaped beard bars extend from the sides of the fully prefabricated floor slab, and pre-buried steel plates are provided on the bottom surfaces of the edges of the fully prefabricated floor slab; the prefabricated columns and the fully prefabricated floor slab are connected by plugging and anchoring through the column longitudinal bars and the pre-buried metal corrugated pipe; the fully prefabricated floor slabs are connected by connecting nodes. The present invention can eliminate the large-scale installation and removal of formwork and brackets on the construction site of the beamless floor slab project, realize the efficient installation of the prefabricated floor slab and prefabricated columns on the construction site, shorten the construction period, and at the same time ensure the strength and quality of the components.

Description

Technical Field

[0001] The invention relates to the field of beamless floor structures, in particular to a prefabricated beamless floor plate-column structure connected with high-strength bolts and a construction method thereof. Background Art

[0002] A beamless floor is a slab-column structure with no beams. The floor slab is supported directly on columns, and the floor load is transmitted directly to the foundation through the columns. Compared to traditional beamed floors, beamless floors have a smaller structural thickness, effectively increasing the usable space of each floor. They also offer aesthetically pleasing overall appearance and greater ease of use. The smooth floor slab improves the installation of equipment and piping, allowing for flexible placement of partition walls and the reconfiguration of rooms as needed. Because the walls can be moved freely, they are particularly suitable for buildings such as office buildings, shopping malls, exhibition halls, industrial plants, and warehouses, where the use of space can be changed at any time.

[0003] For beamless floor structures, actual projects typically utilize precast columns and cast-in-place floor slabs. This involves installing precast columns, erecting full-height scaffolding and formwork throughout the floor slab. Once the floor slab reinforcement, concrete pouring, and curing are complete, the formwork and scaffolding are removed, and this process is repeated until all floors are constructed. This construction process has significant sequential constraints between the various stages, making it impossible to shorten the construction period through technical means. Furthermore, extensive on-site wet work requires extensive on-site scaffolding and formwork, necessitating a high labor demand.

[0004] The invention patent application with patent number CN202111190276.7 has made improvements based on cast-in-place construction. However, overall, although the technical solution in this application adopts an assembled solution, there are still a lot of wet operations such as tying steel bars and pouring concrete on the construction site, which has very limited reduction in the amount of work on the construction site. In addition, the node connection technical details mentioned in this solution are difficult to implement and are not practically feasible. Therefore, it is urgent to design a beamless floor slab column structure and construction method to reduce the complicated installation and removal of support formwork on the construction site, reduce wet operations on the construction site, reduce labor utilization, and improve construction efficiency. Summary of the Invention

[0005] The purpose of the present invention is to provide a prefabricated beamless floor slab-column structure connected by high-strength bolts and a construction method thereof, so as to solve the technical problems of large-scale installation and removal of formwork and brackets at the beamless floor construction site, large amount of wet work, high labor demand pressure and low construction efficiency.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: the present invention provides a prefabricated beamless floor slab column structure connected by high-strength bolts, comprising a fully prefabricated floor slab and a prefabricated column supported on the lower surface of the fully prefabricated floor slab; the prefabricated column is a reinforced concrete column, the top of the prefabricated column is provided with a column top corrugation, and the top surface of the prefabricated column extends outwardly from the column longitudinal reinforcement; the fully prefabricated floor slab is a rectangular reinforced concrete floor slab, and the middle of the fully prefabricated floor slab is provided with an embedded metal corrugated pipe that passes vertically through the thickness direction; U-shaped beard reinforcements extend outwardly from the sides of the fully prefabricated floor slab, the bottom of the fully prefabricated floor slab is provided with a plate bottom reinforcement, and the bottom surface of the edge of the fully prefabricated floor slab is provided with an embedded steel plate, and one side of the embedded steel plate is welded to the plate bottom reinforcement and anchored into the concrete of the fully prefabricated floor slab. In the concrete, one side is cantilevered externally, and a row of first bolt holes arranged at intervals are provided on the cantilevered side of the embedded steel plate; the prefabricated columns and the fully prefabricated floor slabs are connected by means of column longitudinal reinforcement and embedded metal corrugated pipes, and grouting material is filled between the column longitudinal reinforcement and the embedded metal corrugated pipes; the fully prefabricated floor slabs are connected through connecting nodes, which include connecting steel bars, connecting steel plates and concrete in the node area; the connecting steel bars are closed stirrups, and the connecting steel bars are tied and fixed to the U-shaped beard bars on the fully prefabricated floor slabs on both sides; the connecting steel plates are provided with two rows of second bolt holes arranged at intervals, and the connecting steel plates are arranged on the cantilevered side of the embedded steel plates of the fully prefabricated floor slabs on both sides, and are fixed to the embedded steel plates by high-strength bolts.

[0007] Preferably, vertical supports are provided on the lower surfaces of the four edges of the fully prefabricated floor slab; the vertical supports include a top plate, a sleeve and a support rod; the sleeve is provided on the lower end surface of the top plate, and the support rod is threadedly connected to the sleeve.

[0008] Preferably, the length of the connecting steel plate is not less than the length of the embedded steel plate; the length of the U-shaped beard reinforcement extending out of the fully prefabricated floor slab is not greater than half the width of the cantilevered side of the embedded steel plate.

[0009] Preferably, a keyway is provided on the top surface of the prefabricated column to enhance the horizontal shear resistance between the prefabricated column and the fully prefabricated floor slab.

[0010] Preferably, the cross section of the prefabricated column is rectangular or circular, and the cross section of the column top corbel is larger than the cross section of the prefabricated column.

[0011] Preferably, the number of the embedded metal bellows and the column longitudinal reinforcement are the same and their positions correspond, and the inner diameter of the embedded metal bellows is larger than the diameter of the column longitudinal reinforcement.

[0012] Preferably, the embedded steel plate is a rectangular plate, and the first bolt holes are arranged at intervals in the longitudinal direction of the embedded steel plate.

[0013] Preferably, the connecting steel plate is a rectangular plate, and the second bolt holes are arranged at intervals in the longitudinal direction of the connecting steel plate.

[0014] Preferably, the diameter of the first bolt hole is smaller than the diameter of the second bolt hole; and the spacing between the first bolt holes is the same as the spacing between the second bolt holes.

[0015] The present invention also provides a construction method for the above-mentioned prefabricated beamless floor slab column structure connected with high-strength bolts, comprising the following steps:

[0016] Step 1: Produce precast columns, fully precast floor slabs, connecting steel bars, connecting steel plates, high-strength bolts and vertical supports according to design requirements;

[0017] Step 2: Install the prefabricated columns one by one according to the structural plane layout;

[0018] Step 3: According to the layout of the floor slab, vertical supports are installed at intervals on the lower end surfaces of the edges of the fully precast floor slab, and the top elevation of the supports is adjusted to be horizontal with reference to the top elevation of the precast columns;

[0019] Step 4: Spread cement mortar on the top surface of the column top bracket of the precast column to ensure that the precast floor slab is tightly combined with the precast column;

[0020] Step 5: Hoist the fully prefabricated floor slabs piece by piece, ensuring that all the longitudinal reinforcements extending from the top of the columns pass through the pre-buried metal corrugated pipes, and grouting is performed inside the pipes to secure the fully prefabricated floor slabs to the prefabricated columns.

[0021] Step 6: Install the connecting steel plates. After the first bolt hole and the second bolt hole are aligned, install high-strength bolts to achieve bolt connection of the embedded steel plates on both sides.

[0022] Step 7: Install the connecting steel bars and tie them firmly to the U-shaped beard bars, then pour the concrete in the node area and cure until the concrete reaches the designed strength;

[0023] Step 8: Repeat steps 2 to 7 to complete the construction and installation of the next layer of prefabricated columns and fully prefabricated floor slabs.

[0024] The beneficial effects of the present invention are embodied in:

[0025] 1. The present invention provides a prefabricated beamless floor slab column structure connected by high-strength bolts and a construction method thereof. Fully prefabricated beamless floor slabs are used to replace cast-in-place beamless floor slabs or semi-prefabricated beamless floor slabs in traditional technologies. Concrete pouring is only required at the joints between the fully prefabricated floor slabs, thereby minimizing the wet work workload at the construction site and reducing the pressure on the on-site labor demand. Moreover, because fully prefabricated beamless floor slabs are used, a large number of brackets and formworks do not need to be installed at the construction site. Only vertical supports need to be installed at the four edges of the fully prefabricated floor slabs to eliminate the problem of mid-span deflection caused by the self-weight of the prefabricated floor slabs and the pouring of concrete at the nodes, thereby preventing the fully prefabricated floor slabs from overturning when subjected to uneven force and greatly reducing the workload of installing and removing formworks and brackets on site.

[0026] 2. The present invention provides a prefabricated beamless floor slab column structure connected by high-strength bolts and a construction method thereof. Column longitudinal reinforcement is arranged on the top surface of the prefabricated column. The connection between the column and the slab is achieved through the cooperation of the column longitudinal reinforcement and the embedded metal corrugated tube on the fully prefabricated floor slab. Then, grouting is performed in the embedded metal corrugated tube to achieve a fast connection between the column and the slab. This solves the problem of quick connection between the prefabricated column and the full-thickness prefabricated slab and avoids the problem of complex cross-bar fighting at the column-slab node on site. Another advantage of adopting the above connection method is that, compared with the traditional cast-in-place floor slab, which requires the completion of the previous step before the next step can be carried out, the present invention can avoid the sequence constraint relationship between the working procedures, greatly shorten the construction period, greatly improve the construction efficiency and save labor.

[0027] 3. The present invention provides a prefabricated beamless floor slab column structure connected with high-strength bolts and a construction method thereof. An embedded steel plate is provided at the bottom edge of the fully prefabricated floor slab, and two adjacent fully prefabricated floor slabs are connected by connecting steel plates; U-shaped beard bars are provided on the side surfaces of the edges of the fully prefabricated floor slabs, and the U-shaped beard bars between two adjacent fully prefabricated floor slabs are connected by connecting steel bars and then poured with concrete; therefore, the connection between the slabs is a combination of dry and wet, taking into account the advantages of efficient installation of dry nodes and connection integrity of wet nodes, thereby ensuring the high efficiency and high quality of the solution.

[0028] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The main purpose and other advantages of the present invention can be realized and obtained by the solutions particularly pointed out in the description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described in detail below with reference to the accompanying drawings.

[0030] Figure 1 It is a side view of the present invention.

[0031] Figure 2 It is a top view of the present invention.

[0032] Figure 3 It is a schematic diagram of the connection between the prefabricated columns and the fully prefabricated floor slabs of the present invention.

[0033] Figure 4 It is an enlarged view of the connection node of the present invention.

[0034] Figure 5 It is a schematic diagram of the installation of a two-story beamless floor slab column structure according to the present invention.

[0035] Figure numbers: 1-fully prefabricated floor slab, 2-prefabricated column, 3-column top corbel, 4-connection node, 5-vertical support, 11-embedded metal corrugated pipe, 12-slab bottom steel bar, 13-embedded steel plate, 14-first bolt hole, 15-U-shaped beard bar, 21-column longitudinal reinforcement, 41-connecting steel plate, 42-connecting steel bar, 43-node area concrete, 44-second bolt hole, 45-high-strength bolt. DETAILED DESCRIPTION

[0036] The technical solutions of the present invention are described in detail below through examples. The following examples are merely exemplary and can only be used to explain and illustrate the technical solutions of the present invention, and cannot be interpreted as limiting the technical solutions of the present invention.

[0037] Reference Figure 1-2 The present invention provides a prefabricated beamless floor slab column structure connected by high-strength bolts, comprising a fully prefabricated floor slab 1 and prefabricated columns 2 supported on the lower surface of the fully prefabricated floor slab 1; the prefabricated columns 2 are reinforced concrete columns, and a column top corbel 3 is provided on the top of the prefabricated column 2. The cross section of the prefabricated column 2 is rectangular or circular, and the cross section of the column top corbel 3 is larger than the cross section of the prefabricated column 2; a column longitudinal reinforcement 21 extends from the top surface of the prefabricated column 2; and a keyway is further provided on the top surface of the prefabricated column 2 to enhance the horizontal shear resistance between the prefabricated column 2 and the fully prefabricated floor slab 1;

[0038] The fully prefabricated floor 1 is a rectangular reinforced concrete floor. A pre-buried metal corrugated tube 11 is provided in the middle of the fully prefabricated floor 1 and is vertically penetrated in the thickness direction. U-shaped beard bars 15 are extended from the sides of the fully prefabricated floor 1. A bottom steel bar 12 is provided at the bottom of the fully prefabricated floor 1. Pre-buried steel plates 13 are provided on the bottom of the edges of the fully prefabricated floor 1. One side of the pre-buried steel plate 13 is welded to the bottom steel bar 12 and anchored into the concrete of the fully prefabricated floor 1. One side is cantilevered externally. The pre-buried steel plate 13 is a rectangular plate. A row of first bolt holes 14 arranged at intervals in the longitudinal direction are provided on the cantilevered side of the pre-buried steel plate 13. In order to ensure that the connection can be placed on the pre-buried steel plate 13 The steel plate 41 is not affected by the U-shaped beard rib 15, and the length of the U-shaped beard rib 15 extending out of the full precast floor slab 1 cannot be too long, and should be no more than half of the cantilever width of the embedded steel plate 13; vertical supports 5 are set on the lower surface of the four edges of the full precast floor slab 1; the vertical support 5 includes a top plate, a sleeve and a support rod; the sleeve is set on the lower end surface of the top plate, and the support rod is threadedly connected to the sleeve; the vertical support 5 is set to eliminate the problem of mid-span deflection caused by the self-weight and node concrete pouring of the precast floor slab, and on the other hand, it also plays a temporary supporting and protective role for the installation of the full precast floor slab 1 to avoid the overturning of the full precast floor slab 1 when the force is uneven.

[0039] Reference Figure 3The prefabricated column 2 and the fully prefabricated floor 1 are connected by plugging in the column longitudinal reinforcement 21 and the embedded metal corrugated pipe 11. The number of the embedded metal corrugated pipe 11 and the column longitudinal reinforcement 21 are the same and the positions are corresponding. The inner diameter of the embedded metal corrugated pipe 11 is larger than the diameter of the column longitudinal reinforcement 21. Grouting material is filled between the column longitudinal reinforcement 21 and the embedded metal corrugated pipe 11.

[0040] Reference Figure 4 The fully prefabricated floor slabs 1 are connected through connecting nodes 4, which include connecting steel bars 42, connecting steel plates 41 and node area concrete 43; the connecting steel bars 42 are closed stirrups, and the connecting steel bars 42 are tied and fixed to the U-shaped beard bars 15 on the fully prefabricated floor slabs 1 on both sides; the connecting steel plates 41 are rectangular steel plates, and the second bolt holes 44 are provided on the connecting steel plates 41 with two rows of second bolt holes 44 arranged at intervals in the longitudinal direction. The connecting steel plates 41 are arranged on the cantilevered sides of the embedded steel plates 13 of the fully prefabricated floor slabs 1 on both sides, and are fixedly connected to the embedded steel plates 13 by high-strength bolts 45. The length of the connecting steel plates 41 is not less than the length of the embedded steel plates 13; the diameter of the first bolt holes 14 is smaller than the diameter of the second bolt holes 44, and the spacing of the first bolt holes 14 is the same as the spacing of the second bolt holes 44.

[0041] Reference Figure 5 A sleeve is set at the bottom of the prefabricated column 2, and the number of the sleeves is the same as the column longitudinal reinforcement 21 and the position corresponds to that of the column longitudinal reinforcement 21; after the first layer of slab-column structure is installed, when installing the second layer of prefabricated columns 2, the prefabricated columns 2 are hoisted, and the sleeves are aligned with the column longitudinal reinforcement 21 on the top surface of the lower layer of prefabricated columns 2, so that the column longitudinal reinforcement 21 is inserted into the sleeve, and then the sleeve is grouted to achieve the connection between the upper and lower layers of prefabricated columns 2.

[0042] The present invention also provides a construction method for the above-mentioned prefabricated beamless floor slab column structure connected with high-strength bolts, comprising the following steps:

[0043] Step 1: Prepare prefabricated columns 2, fully prefabricated floor slabs 1, connecting steel bars 42, connecting steel plates 41, high-strength bolts 45, and vertical supports 5 according to design requirements;

[0044] Step 2: Install the prefabricated columns 2 one by one according to the structural plane layout;

[0045] Step 3: According to the layout of the floor slab, vertical supports 5 are installed at intervals on the lower end surfaces of the four edges of the fully prefabricated floor slab 1, and the top elevation of the supports is adjusted to the horizontal level with reference to the top elevation of the prefabricated columns 2;

[0046] Step 4: Spread cement mortar on the top surface of the column top corbel 3 of the precast column 2 to ensure that the precast floor slab 1 is tightly combined with the precast column 2;

[0047] Step 5: hoist the fully prefabricated floor slabs 1 piece by piece, ensure that the column longitudinal reinforcement 21 extending outward from the column top all passes through the pre-buried metal corrugated tubes 11, and grout the inside to achieve the connection and fixation of the fully prefabricated floor slabs 1 and the prefabricated columns 2;

[0048] Step 6: Install the connecting steel plate 41. After the first bolt hole 14 and the second bolt hole 44 are aligned, install the high-strength bolts 45 to achieve bolt connection of the embedded steel plates 13 on both sides.

[0049] Step 7: Install the connecting steel bars 42 and securely tie the connecting steel bars 42 to the U-shaped beard bars 15, then pour concrete 43 in the node area and cure until the concrete reaches the designed strength.

[0050] Step 8: Repeat the operations of steps 2 to 7 to complete the construction and installation of the next layer of prefabricated columns 2 and the fully prefabricated floor slabs 1.

[0051] Furthermore, in this embodiment, the high-strength bolt 45 passes through the first bolt hole 14 and the second bolt hole 44 from bottom to top, the head of the bolt is located on the lower end surface of the connecting steel plate 41, and the screw part is located on the upper end surface of the connecting steel plate 41. In this way, on the one hand, when pouring the concrete 43 in the node area, the screw part will be embedded in the concrete to enhance the connection stability. On the other hand, there is no exposed screw head on the lower surface of the joint of the fully prefabricated floor slab 1, and the joint surface is beautiful and neat.

[0052] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that a person skilled in the art can conceive within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention.

Claims

1. A prefabricated beamless floor slab column structure connected by high-strength bolts, characterized by: It comprises a fully prefabricated floor slab (1) and prefabricated columns (2) supported on the lower surface of the fully prefabricated floor slab (1); The prefabricated column (2) is a reinforced concrete column, a column top corbel (3) is provided on the top of the prefabricated column (2), and a column longitudinal reinforcement (21) is extended from the top surface of the prefabricated column (2); The fully prefabricated floor slab (1) is a rectangular reinforced concrete floor slab, and a pre-buried metal corrugated pipe (11) is provided in the middle of the fully prefabricated floor slab (1) and is vertically penetrated in the thickness direction; U-shaped beard bars (15) are extended from the sides of the fully prefabricated floor slab (1), a bottom steel bar (12) is provided at the bottom of the fully prefabricated floor slab (1), and a pre-buried steel plate (13) is provided on the bottom surface of the edge of the fully prefabricated floor slab (1), one side of the pre-buried steel plate (13) is welded to the bottom steel bar (12) and anchored in the concrete of the fully prefabricated floor slab (1), and one side is cantilevered externally, and a row of first bolt holes (14) arranged at intervals are provided on the cantilevered side of the pre-buried steel plate (13); The prefabricated column (2) and the fully prefabricated floor slab (1) are connected by plugging the column longitudinal reinforcement (21) and the embedded metal corrugated pipe (11), and the space between the column longitudinal reinforcement (21) and the embedded metal corrugated pipe (11) is filled with grouting material; The fully prefabricated floor slabs (1) are connected via connection nodes (4), which include connection steel bars (42), connection steel plates (41) and node area concrete (43); the connection steel bars (42) are closed stirrups, and the connection steel bars (42) are tied and fixed to the U-shaped beard bars (15) on the fully prefabricated floor slabs (1) on both sides; the connection steel plates (41) are overlapped and arranged on the cantilevered sides of the embedded steel plates (13) of the fully prefabricated floor slabs (1) on both sides, and two rows of second bolt holes (44) arranged at intervals are provided on the connection steel plates (41), and high-strength bolts (45) are passed through the first bolt holes (14) and the second bolt holes (44) to fix the connection steel plates (41) to the embedded steel plates (13).

2. The prefabricated flat floor slab column structure connected by high-strength bolts according to claim 1, characterized in that: Vertical supports (5) are provided on the lower surface of the four edges of the fully prefabricated floor slab (1); the vertical supports (5) include a top plate, a sleeve, and a support rod; the sleeve is provided on the lower end surface of the top plate, and the support rod is threadedly connected to the sleeve.

3. The prefabricated beamless floor slab column structure connected by high-strength bolts according to claim 2, characterized in that: The length of the connecting steel plate (41) is not less than the length of the embedded steel plate (13); and the length of the U-shaped beard reinforcement (15) extending out of the fully prefabricated floor slab (1) is not greater than half the width of the cantilevered side of the embedded steel plate (13).

4. The prefabricated flat floor slab column structure connected by high-strength bolts according to claim 2, characterized in that: The top surface of the prefabricated column (2) is provided with a keyway for enhancing the horizontal shear resistance between the prefabricated column (2) and the fully prefabricated floor slab (1).

5. The prefabricated beamless floor slab column structure connected by high-strength bolts according to claim 2, characterized in that: The cross section of the prefabricated column (2) is rectangular or circular, and the cross section of the column top corbel (3) is larger than the cross section of the prefabricated column (2).

6. The prefabricated flat floor slab column structure connected by high-strength bolts according to claim 2, characterized in that: The number of the embedded metal corrugated pipes (11) and the column longitudinal reinforcement (21) are the same and their positions correspond to each other. The inner diameter of the embedded metal corrugated pipes (11) is greater than the diameter of the column longitudinal reinforcement (21).

7. The prefabricated flat floor slab column structure connected by high-strength bolts according to claim 2, characterized in that: The embedded steel plate (13) is a rectangular plate, and the first bolt holes (14) are arranged at intervals in the longitudinal direction of the embedded steel plate (13).

8. The prefabricated flat floor slab column structure connected by high-strength bolts according to claim 2, characterized in that: The connecting steel plate (41) is a rectangular plate, and the second bolt holes (44) are arranged at intervals in the longitudinal direction of the connecting steel plate (41).

9. The prefabricated flat floor slab column structure connected by high-strength bolts according to claim 2, characterized in that: The diameter of the first bolt hole (14) is smaller than the diameter of the second bolt hole (44); and the spacing between the first bolt holes (14) is the same as the spacing between the second bolt holes (44).

10. The construction method of a prefabricated flat floor slab column structure connected by high-strength bolts according to claim 2, characterized in that: The steps include: Step 1: Produce prefabricated columns (2), fully prefabricated floor slabs (1), connecting steel bars (42), connecting steel plates (41), high-strength bolts (45), and vertical supports (5) according to design requirements; Step 2: Install the prefabricated columns (2) one by one in place according to the structural plane layout; Step 3: According to the layout of the floor slab, vertical supports (5) are installed at intervals on the lower surface of the edges of the fully prefabricated floor slab (1), and the top elevation of the supports is adjusted to be horizontal with reference to the top elevation of the prefabricated columns (2); Step 4: Spread cement mortar on the top surface of the column top corbel (3) of the prefabricated column (2) to ensure that the prefabricated floor slab (1) and the prefabricated column (2) are tightly combined; Step 5: hoist the fully prefabricated floor slabs (1) piece by piece, ensure that the column longitudinal reinforcements (21) extending outward from the column tops all pass through the pre-buried metal corrugated tubes (11), and grout them to achieve the connection and fixation of the fully prefabricated floor slabs (1) and the prefabricated columns (2); Step six, installing the connecting steel plate (41), after completing the alignment of the first bolt hole (14) and the second bolt hole (44), installing the high-strength bolt (45) to achieve the bolt connection of the embedded steel plates (13) on both sides; Step 7: Install the connecting steel bars (42), tie the connecting steel bars (42) and the U-shaped beard bars (15) firmly, pour the node area concrete (43), and cure until the concrete reaches the design strength; Step eight, repeat the operations of steps two to seven to complete the construction and installation of the next layer of prefabricated columns (2) and the fully prefabricated floor slab (1).

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