Assembled fully prefabricated hollow-core floor structure system and support-free construction method

Abstract

The present invention discloses an assembled fully prefabricated hollow floor structure system, which relates to an assembled building and includes fully prefabricated hollow floor, steel bar bundles and prefabricated corbels; the fully prefabricated hollow floor is overlapped on the prefabricated corbels, and an end node post-cast section and a side node post-cast section are provided between the fully prefabricated hollow floor and the prefabricated corbels, a joint node post-cast section is provided between two adjacent fully prefabricated hollow floor, and the end node post-cast section, the side node post-cast section and the joint node post-cast section are connected; the fully prefabricated hollow floor is provided with a steel bar bundle extending to the end node post-cast section, the side node post-cast section is provided with a first steel bar grid connected to both the fully prefabricated hollow floor and the prefabricated corbels, and the joint node post-cast section is provided with a second steel bar grid. The present invention also discloses a support-free construction method for an assembled fully prefabricated hollow floor structure system. The connection nodes of the present invention have good stress-bearing performance, the prefabricated components are light in weight, and no temporary support is required at the construction site.

Description

Technical Field

[0001] The present invention relates to an assembled building, and more particularly to an assembled fully prefabricated hollow floor slab structure system and a support-free construction method. Background Art

[0002] The floor slab is one of the main load-bearing structures of a building. It bears the loads above the floor and transfers these loads to the beams, columns and walls below.

[0003] Currently, floor slab construction methods are generally categorized as "cast-in-place" and "assembly." Cast-in-place is a traditional wet-work construction method, where formwork and supports are set up below the floor at the construction site. After reinforcing steel bars are tied to the formwork, concrete is poured onto the formwork and vibrated to compact it. Once the concrete reaches a certain strength, the formwork and supports are removed. Assembly is a new construction method adapted to the industrialization of construction. Floor slabs are prefabricated in a factory with pre-installed connections. These prefabricated slabs are then assembled into a structure on site using these pre-installed connections.

[0004] Compared with traditional cast-in-place floor slabs, prefabricated floor slabs have the advantages of factory production, controllable quality, high environmental benefits, reduced workload on the construction site, and increased construction speed. Therefore, prefabricated floor slabs are one of the most widely used prefabricated components in prefabricated buildings.

[0005] Existing prefabricated floor slab technologies are generally divided into: prefabricated composite slab technology, steel truss floor slab technology, steel truss floor slab technology without removing the bottom formwork, and fully prefabricated floor slab technology.

[0006] Steel truss floor decking technology and steel truss floor decking technology without dismantling bottom formwork require a large amount of wet floor work at the construction site because the bottom plate is only used as a formwork. The degree of prefabricated industrialization is low and the improvement in construction efficiency is limited. At the same time, since the temporary stiffness of steel truss floor decking and steel truss floor decking without dismantling bottom formwork is low, a large number of supports still need to be erected under the floor at the construction site to support the temporary construction load, which consumes working hours.

[0007] Prefabricated composite slab technology is the main technology used in existing prefabricated buildings. Specifically, a prefabricated part of the floor slab is set up at the bottom. After it is hoisted to the construction site, the cast-in-place part of the floor slab is cast. Therefore, a lot of wet floor operations are still required at the construction site, and the improvement in construction efficiency is limited. At the same time, although in theory prefabricated composite slabs can be placed on the protective layers of beams, columns, and walls during construction, for construction safety reasons, most prefabricated building construction sites currently still use a large number of brackets under the prefabricated composite slabs to support temporary construction loads, which wastes working hours. In addition, prefabricated composite slab technology has the problem of being unsuitable for large-span floor slabs, and its application scope is limited.

[0008] Fully prefabricated floor slab technology is the latest development direction of prefabricated floor slabs. It has the advantages of minimal on-site wet work, a high degree of prefabrication industrialization, and high construction efficiency. However, the current fully prefabricated floor slab technology still has problems such as poor stress performance of the connection nodes between the floor slab and the beams and walls. The fully prefabricated floor slab cannot withstand negative bending moments and cannot be made into continuous slabs or cantilevered slabs. It is also difficult to reserve and embed equipment pipelines, the prefabricated components are heavy, and transportation and lifting are inconvenient.

[0009] Therefore, it is necessary to design an assembled fully prefabricated hollow floor structure system and a support-free construction method to solve the above problems. Summary of the Invention

[0010] The technical problem to be solved by the present invention is to address the shortcomings of the existing technology and provide an assembled fully prefabricated hollow floor structure system and a support-free construction method. The connection nodes have good stress performance, the prefabricated components are light in weight, and no temporary support is required at the construction site.

[0011] The assembled fully prefabricated hollow floor structural system described in the present invention includes fully prefabricated hollow floor slabs, steel bar bundles and prefabricated corbels; the fully prefabricated hollow floor slabs are overlapped on the prefabricated corbels, and end node post-cast sections and side node post-cast sections are provided between the fully prefabricated hollow floor slabs and the prefabricated corbels, a joint node post-cast section is provided between two adjacent fully prefabricated hollow floor slabs, and the end node post-cast sections, side node post-cast sections and joint node post-cast sections are connected; the fully prefabricated hollow floor slabs are provided with steel bar bundles extending to the end node post-cast sections, the side node post-cast sections are provided with a first steel grid connected to both the fully prefabricated hollow floor slabs and the prefabricated corbels, and the joint node post-cast sections are provided with a second steel grid.

[0012] Preferably, the fully prefabricated hollow floor slab includes top stress-bearing steel bars, bottom stress-bearing steel bars, and annular distribution steel bars; the top stress-bearing steel bars are arranged above the fully prefabricated hollow floor slab, and the bottom stress-bearing steel bars are arranged below the fully prefabricated hollow floor slab. Top horizontal steel bars are also provided above the fully prefabricated hollow floor slab, and bottom horizontal steel bars are also provided below the fully prefabricated hollow floor slab. The top stress-bearing steel bars, bottom stress-bearing steel bars, annular distribution steel bars, top horizontal steel bars and bottom horizontal steel bars constitute a steel mesh; a plurality of post-casting holes are opened at both ends of the fully prefabricated hollow floor slab, and steel bar bundles are inserted into the post-casting holes.

[0013] Preferably, a plurality of ventilation holes are provided on the surfaces of both ends of the fully prefabricated hollow floor slab, the plurality of ventilation holes are connected to a plurality of post-casting holes in a one-to-one correspondence, and the ventilation holes are arranged above the post-casting holes.

[0014] Preferably, a plurality of hollow holes are provided in the fully prefabricated hollow floor slab, partitions are provided at both ends of the fully prefabricated hollow floor slab, and the hollow holes are located between the two partitions, and the plurality of post-cast holes correspond one-to-one to the plurality of hollow holes and are separated by partitions.

[0015] Preferably, the steel bar bundle includes a plurality of circular steel bar rings and connecting steel bars; the plurality of connecting steel bars are inserted into the circular steel bar rings and fixedly connected to the circular steel bar rings.

[0016] Preferably, the top horizontal steel bars and the bottom horizontal steel bars are arranged perpendicular to the stress-bearing steel bars, and both ends of the top horizontal steel bars and the bottom horizontal steel bars pass through and extend to the outside of the fully prefabricated hollow floor slab.

[0017] Preferably, reserved steel bars are fixed on the prefabricated corbels in the post-cast sections of the side nodes, and the top horizontal steel bars and the bottom horizontal steel bars in the post-cast sections of the side nodes on the fully prefabricated hollow floor slabs are anchored and connected to the reserved steel bars to form a first steel grid.

[0018] Preferably, the joint node post-cast section is provided with joint steel bars, and the joint steel bars are arranged between the top horizontal steel bars and the bottom horizontal steel bars in the post-cast section of the joint node to form a second steel grid; the joint steel bars are anchored and connected to the top horizontal steel bars and the bottom horizontal steel bars.

[0019] Preferably, the top horizontal steel bars in the post-cast section of the joint node on two adjacent fully prefabricated hollow floor slabs are staggered with each other, and the bottom horizontal steel bars in the post-cast section of the joint node on two adjacent fully prefabricated hollow floor slabs are staggered with each other.

[0020] A support-free construction method for the assembled fully prefabricated hollow floor structure system includes the following steps:

[0021] Step 1: Make fully prefabricated hollow-core floor slabs;

[0022] Step 2: transporting the fully prefabricated hollow floor slab to the construction site, and then inserting steel tendons into the post-casting holes at both ends of the fully prefabricated hollow floor slab;

[0023] Step 3: hoisting the fully prefabricated hollow-core floor slab with the steel bar bundle onto the prefabricated corbel at a predetermined position;

[0024] Step 4: Pull out the steel bar bundle in the post-casting hole to a predetermined length and fix it;

[0025] Step 5: two joint steel bars are arranged in the post-cast section of the joint node, and one of the joint steel bars is fixedly connected to the top horizontal steel bar, and the other joint steel bar is fixedly connected to the bottom horizontal steel bar;

[0026] Step 6: Pour concrete into the end node post-casting section, the side node post-casting section, the joint node post-casting section, and the post-casting holes until the concrete emerges from the vent holes.

[0027] Beneficial effects

[0028] The advantages of the present invention are:

[0029] 1. By setting the fully prefabricated hollow floor slabs on prefabricated corbels, the problem of needing to set up a large number of traditional temporary supports during the construction of prefabricated floor slabs and low construction efficiency is solved.

[0030] 2. By setting steel bar bundles on the post-casting hole side of the fully prefabricated hollow floor slab, and setting reserved steel bars connected to the vertical components on the non-post-casting hole side, the stress performance of the connection nodes of the prefabricated fully prefabricated hollow floor slab is greatly improved, so that the prefabricated fully prefabricated hollow floor slab can withstand negative bending moment, which expands the scope of use of the prefabricated fully prefabricated hollow floor slab, promotes the innovative development of prefabricated buildings, and has good economic and practical value.

[0031] 3. By setting post-cast holes inside the fully prefabricated hollow floor slabs, which also serve as hollow holes, the weight of the assembled fully prefabricated floor slabs can be reduced, making transportation and lifting more convenient. In addition, pipelines and junction boxes can be pre-buried during production according to the needs of equipment professionals, and the wires and pipes can be routed through the cavity, which can also improve the thermal insulation and sound insulation performance during the use of the building. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a three-dimensional schematic diagram of the structural system of the present invention;

[0033] Figure 2 It is a three-dimensional schematic diagram of the post-cast section of the end node of the fully prefabricated hollow floor slab of the present invention;

[0034] Figure 3 This is a three-dimensional schematic diagram of the post-cast section of the side nodes of the fully prefabricated hollow-core floor slab of the present invention;

[0035] Figure 4 It is a three-dimensional schematic diagram of the post-cast section of the joint node of the fully prefabricated hollow floor slab of the present invention;

[0036] Figure 5 is a three-dimensional schematic diagram of a reinforcing bar tendon of the present invention;

[0037] Figure 6 It is a three-dimensional schematic diagram of the pouring section after pouring each node in the structural system of the present invention.

[0038] Figure identification: 1. Fully precast hollow slab; 2. Steel bar bundle; 3. Precast corbel; 4. Post-cast section of end node; 5. Post-cast section of side node; 6. Post-cast section of joint node; 7. Top stress-bearing steel bar; 8. Bottom stress-bearing steel bar; 9. Annular distribution steel bar; 10. Top horizontal steel bar; 11. Bottom horizontal steel bar; 12. Partition; 13. Circular formwork; 14. Hollow hole; 15. Post-cast hole; 16. Vent hole; 17. Circular steel bar ring; 18. Connecting steel bar; 19. Reserved steel bar; 20. Joint steel bar. DETAILED DESCRIPTION

[0039] The present invention will be further described below in conjunction with the embodiments, but this does not constitute any limitation to the present invention. Any limited number of modifications made by anyone within the scope of the claims of the present invention are still within the scope of the claims of the present invention.

[0040] See Figures 1-6 The assembled fully prefabricated hollow floor slab structural system of the present invention includes a fully prefabricated hollow floor slab 1, a steel bar bundle 2, a prefabricated corbel 3, an end node post-cast section 4, a side node post-cast section 5 and a joint node post-cast section 6. The fully prefabricated hollow floor slab 1 is overlapped on the prefabricated corbel 3 to support the fully prefabricated hollow floor slab 1. An end node post-cast section 4 and a side node post-cast section 5 are provided between the fully prefabricated hollow floor slab 1 and the prefabricated corbel 3. A joint node post-cast section 6 is provided between two adjacent fully prefabricated hollow floor slabs 1. The end node post-cast section 4, the side node post-cast section 5 and the joint node post-cast section 6 are connected. That is, in the assembled structural system, only the joints of the fully prefabricated hollow floor slab 1 and the surrounding areas need to be cast on site, which greatly reduces the on-site casting area and improves efficiency. The fully precast hollow-core slab 1 is equipped with steel tendons 2 extending to the post-cast sections 4 at the end nodes. The side post-cast sections 5 are equipped with a first steel mesh connecting both the fully precast hollow-core slab 1 and the precast corbels 3. A second steel mesh is provided in the post-cast sections 6 at the joint nodes. In the structural system of the present invention, rigid connection nodes for the steel tendons—namely, the steel tendons 2, the first steel mesh, and the second steel mesh—are all located where concrete needs to be poured on-site, ensuring reliable connections at the cast-in-place locations.

[0041] In the present invention, the fully prefabricated hollow floor 1 is provided with top stress-bearing steel bars 7, bottom stress-bearing steel bars 8, annular distribution steel bars 9, top horizontal steel bars 10, bottom horizontal steel bars 11, partitions 12, circular formwork 13, hollow holes 14, post-casting holes 15 and air holes 16. Figure 1 、 Figure 2 and Figure 6As shown, the top stress-bearing steel bars 7 and the bottom stress-bearing steel bars 8 are arranged along the entire length of the hollow hole 14 in the direction of the fully precast hollow floor slab 1, and the annular distribution steel bars 9 are arranged at intervals in the direction perpendicular to the hollow hole 14 in the fully precast hollow floor slab 1. Specifically, the top stress-bearing steel bars 7 are arranged above the fully precast hollow floor slab 1, and the bottom stress-bearing steel bars 8 are arranged below the fully precast hollow floor slab 1. Top horizontal steel bars 10 are also provided above the fully precast hollow floor slab 1, and bottom horizontal steel bars 11 are also provided below the fully precast hollow floor slab 1. The top stress-bearing steel bars 7 and the bottom stress-bearing steel bars 8, the annular distribution steel bars 9, the top horizontal steel bars 10 and the bottom horizontal steel bars 11 are anchored and connected to form a steel mesh, forming a complete floor slab system. A plurality of post-cast holes 15 are opened at both ends of the fully precast hollow floor slab 1, and steel bar bundles 2 are inserted into the post-cast holes 15. The post-cast holes 15 are mainly formed by the circular formwork 13 embedded in the fully precast hollow floor slab 1 before it is cast. After pouring is completed, hollow holes 14 are formed in the fully prefabricated hollow floor slab 1 .

[0042] The surfaces of both ends of the fully precast hollow-core floor slab 1 are provided with multiple ventilation holes 16. These ventilation holes 16 are connected one-to-one with the multiple post-casting holes 15 and are located above the post-casting holes 15. The ventilation holes 16 are primarily used to detect when the cast-in-place section of the structural system is fully filled with concrete. Specifically, if concrete emerges from the ventilation holes 16 during pouring, the pouring is considered complete. This design effectively ensures smoothness after pouring.

[0043] In addition, a plurality of hollow holes 14 are provided in the fully precast hollow floor slab 1. Partition plates 12 are provided at both ends of the fully precast hollow floor slab 1, with the hollow holes 14 located between the two partition plates 12. The provision of the partition plates 12 forms closed hollow holes 14 in the fully precast hollow floor slab 1, i.e., the hollow holes 14 are not connected to the post-casting holes 15, thereby preventing the problem of concrete entering the hollow holes 14 during the subsequent pouring process.

[0044] The reinforcing bar bundle 2 of the present invention comprises a circular reinforcing ring 17 and connecting bars 18. Multiple connecting bars 18 are inserted into and fixedly connected to the circular reinforcing ring 17. The constructed reinforcing bar bundle 2 forms a cage-like structure, with a reinforcing bar bundle 2 inserted into each post-cast hole 15 at each end of the fully precast hollow-core floor slab 1, thereby forming a concrete steel structure between the ends of the fully precast hollow-core floor slab 1 and the precast corbels 3.

[0045] like Figure 1 、 Figure 3 、 Figure 4 and Figure 6As shown, the top horizontal reinforcement 10 and the bottom horizontal reinforcement 11 are arranged throughout the entire length of the fully precast hollow floor slab 1, perpendicular to the hollow hole 14, and spaced apart from the annular distribution reinforcement 9. The top horizontal reinforcement 10 and the bottom horizontal reinforcement 11 extend out of the fully precast hollow floor slab 1 in the direction of the lateral node post-cast section 5, extend into the lateral node post-cast section 5, and are anchored to the reserved reinforcement 19 above the precast corbel 3 in the lateral node post-cast section 5. The top horizontal reinforcement 10 and the bottom horizontal reinforcement 11 extend out of the fully precast hollow floor slab 1 in the direction of the joint node post-cast section 6 and extend into the joint node post-cast section 6.

[0046] like Figure 1 、 Figure 4 and Figure 6 As shown, the post-cast section 6 of the joint node is provided with joint reinforcement 20 and the top horizontal reinforcement 10 and the bottom horizontal reinforcement 11 extending therefrom. The top horizontal reinforcement 10 and the bottom horizontal reinforcement 11 of the two fully prefabricated hollow slabs 1 are staggered with each other, and the joint reinforcement 20 is arranged between the top horizontal reinforcement 10 and the bottom horizontal reinforcement 11, fixedly connected thereto, and arranged along the post-cast section 6 of the joint node, forming a second reinforcement grid. Such a structure not only realizes the fixed connection of the two fully prefabricated hollow slabs 1 on the steel structure, but also greatly improves the reliability of the connection after casting, effectively preventing the floor slab from cracking due to drying shrinkage of the concrete.

[0047] The unsupported construction method of the reinforcement tendon connection nodes of prefabricated hollow-core slabs is achieved through the following steps:

[0048] The first step is to make the fully precast hollow slab 1. According to the design, the top stress-bearing steel bars 7, bottom stress-bearing steel bars 8, annular distribution steel bars 9, top horizontal steel bars 10, and bottom horizontal steel bars 11 are tied together inside the fully precast hollow slab 1. Then, circular formwork 13 is set at the predetermined hollow hole 14 position, and partitions 12 are placed. At the same time, removable formwork is set at the post-casting holes 15 and air vents 16 positions. Then, concrete for the fully precast hollow slab 1 is poured. Finally, after the concrete reaches the designed strength, the side formwork of the fully precast hollow slab 1 and the removable formwork at the post-casting holes 15 and air vents 16 positions are removed.

[0049] In the second step, after the fully prefabricated hollow-core floor slab 1 is loaded onto a truck and transported to the construction site, the steel bar tendons 2 are placed inside the post-casting holes 15 of the fully prefabricated hollow-core floor slab 1 .

[0050] The third step is to hoist the fully prefabricated hollow-core floor slab 1 with the reinforcement bar bundle 2 onto the prefabricated corbel 3 at the predetermined position.

[0051] The fourth step is to pull out the steel bar bundle 2 inside the post-casting hole 15 to a predetermined length and fix it.

[0052] The fifth step is to arrange joint reinforcement 20 in the post-cast section 6 of the joint node between the two fully prefabricated hollow-core floor slabs 1 and install a formwork below the post-cast section 6 of the joint node.

[0053] The sixth step is to pour concrete into the end node post-casting section 4, the side node post-casting section 5, the joint node post-casting section 6, and the post-casting hole 15 until the concrete emerges from the vent hole 16, thereby completing the pouring.

[0054] As another example, the precast corbels 3 can be installed on either precast wall panels or precast beams; the fully precast hollow slab 1 can also be installed on the corbels of cast-in-place wall panels or cast-in-place structural beams. Furthermore, the hollow holes of the fully precast hollow slab 1 can be arranged along either the long side or the short side of the slab. If the reinforcing bar bundles 2 are not provided in this structural system, the partitions 12 can be omitted between the hollow holes 14 and the post-cast holes 15. The hollow holes 14 and the post-cast holes 15 form a continuous cavity. During production, after the concrete reaches the design strength, the circular formwork 13 within the cavity can be completely removed, and the cavity without the reinforcing bar bundles 2 can be sealed with sealing material to prevent concrete from flowing into the cavity during on-site concrete pouring. The hollow holes 14 and post-cast holes 15 within the fully precast hollow slab 1 can be configured as circular or square cavities. If configured as square cavities, the reinforcing bar bundles can also be configured as square reinforcing bar bundles, and the circular formwork can be replaced with a square formwork.

[0055] Preferably, the bottom stress-bearing steel bars 8 of the large-span fully prefabricated hollow floor slab 1 should be prestressed steel bars, and the bottom stress-bearing steel bars 8 of the small and medium-span fully prefabricated hollow floor slab 1 can also be prestressed steel bars, and the diameter of the top stress-bearing steel bars 7 should be larger than the diameter of the bottom stress-bearing steel bars 8.

[0056] Preferably, the number of connecting steel bars 18 of the steel bar bundle 2 is no less than 4.

[0057] Preferably, the annular distribution reinforcement 9 in the fully prefabricated hollow floor slab 1 can be densely arranged in the section of the post-cast holes 15 .

[0058] Preferably, the steel tendons 2 are arranged at intervals in the post-cast holes 15 of the fully precast hollow-core floor slab 1 .

[0059] Preferably, grooves are provided around the fully prefabricated hollow-core floor slab 1 to facilitate the pouring of the end node post-casting section 4, the side node post-casting section 5 and the joint node post-casting section 6.

[0060] Preferably, if the prefabricated corbels 3 are arranged on the wall panels, the end nodes and side nodes of the fully prefabricated hollow floor slabs 1 of the same wall panel need to be arranged in layers.

[0061] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention. These modifications and improvements will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. Assembled fully prefabricated hollow floor structure system, characterized by: The invention comprises a fully prefabricated hollow floor slab (1), a steel bar bundle (2) and a prefabricated corbel (3); the fully prefabricated hollow floor slab (1) is overlapped on the prefabricated corbel (3), and an end node post-casting section (4) and a side node post-casting section (5) are provided between the fully prefabricated hollow floor slab (1) and the prefabricated corbel (3); a joint node post-casting section (6) is provided between two adjacent fully prefabricated hollow floor slabs (1); the end node post-casting section (4), the side node post-casting section (5) and the joint node post-casting section (6) are connected; the fully prefabricated hollow floor slab (1) is provided with a steel bar bundle (2) extending to the end node post-casting section (4), and the side node post-casting section (5) is provided with a steel bar bundle (2) extending to the end node post-casting section (4). A first steel mesh connected to the fully prefabricated hollow slab (1) and the prefabricated corbel (3); a second steel mesh provided in the post-cast section (6) of the joint node; the fully prefabricated hollow slab (1) comprises a top stress-bearing steel bar (7), a bottom stress-bearing steel bar (8), and an annular distribution steel bar (9); the top stress-bearing steel bar (7) is provided above the fully prefabricated hollow slab (1), the bottom stress-bearing steel bar (8) is provided below the fully prefabricated hollow slab (1), a top horizontal steel bar (10) is further provided above the fully prefabricated hollow slab (1), a bottom horizontal steel bar (11) is further provided below the fully prefabricated hollow slab (1), the top stress-bearing steel bar (7), the bottom stress-bearing steel bar (8) are provided below the fully prefabricated hollow slab (1), and the top stress-bearing steel bar (7), the bottom stress-bearing steel bar (8) are provided below the fully prefabricated hollow slab (1). The steel mesh is composed of a force reinforcement bar (8), an annular distribution reinforcement bar (9), a top horizontal reinforcement bar (10) and a bottom horizontal reinforcement bar (11); a plurality of post-casting holes (15) are provided at both ends of the fully prefabricated hollow slab (1), and a reinforcement bar bundle (2) is inserted into the post-casting holes (15); a plurality of air holes (16) are provided on the surface of both ends of the fully prefabricated hollow slab (1), and the plurality of air holes (16) are connected to the plurality of post-casting holes (15) in a one-to-one correspondence, and the air holes (16) are arranged above the post-casting holes (15); a plurality of hollow holes (14) are provided in the fully prefabricated hollow slab (1), and a partition is provided at both ends of the fully prefabricated hollow slab (1). (12), and the hollow hole (14) is located between the two partitions (12), and the multiple post-casting holes (15) correspond to the multiple hollow holes (14) one by one and are separated by the partition (12); the steel bar bundle (2) includes multiple circular steel bar rings (17) and connecting steel bars (18); the multiple connecting steel bars (18) are all inserted into the circular steel bar rings (17) and fixedly connected to the circular steel bar rings (17); the top horizontal steel bars (10) and the bottom horizontal steel bars (11) are arranged perpendicular to the stress-bearing steel bars, and both ends of the top horizontal steel bars (10) and the bottom horizontal steel bars (11) pass through and extend to the outside of the fully prefabricated hollow floor slab (1).

2. The assembled fully prefabricated hollow floor structure system according to claim 1 is characterized in that: A reserved steel bar (19) is fixedly provided on the prefabricated corbel (3) in the lateral node post-cast section (5), and the top horizontal steel bar (10) and the bottom horizontal steel bar (11) in the lateral node post-cast section (5) on the fully prefabricated hollow floor slab (1) are anchored and connected to the reserved steel bar (19), forming a first steel bar grid.

3. The assembled fully prefabricated hollow floor structure system according to claim 1 is characterized in that: The joint node post-cast section (6) is provided with joint steel bars (20), and the joint steel bars (20) are arranged between the top horizontal steel bars (10) and the bottom horizontal steel bars (11) in the joint node post-cast section (6), forming a second steel grid; the joint steel bars (20) are anchored to the top horizontal steel bars (10) and the bottom horizontal steel bars (11).

4. The assembled fully prefabricated hollow floor structure system according to claim 1, characterized in that: The top horizontal steel bars (10) in the post-cast sections (6) of the joint nodes on two adjacent fully prefabricated hollow slabs (1) are arranged in a staggered manner, and the bottom horizontal steel bars (11) in the post-cast sections (6) of the joint nodes on two adjacent fully prefabricated hollow slabs (1) are arranged in a staggered manner.

5. A support-free construction method for the assembled fully prefabricated hollow floor structure system according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: Step 1: Making a fully prefabricated hollow-core floor slab (1); Step 2: transporting the fully prefabricated hollow floor slab (1) to the construction site, and then inserting the steel bar bundles (2) into the post-casting holes (15) at both ends of the fully prefabricated hollow floor slab (1); Step 3: hoisting the fully prefabricated hollow floor slab (1) with the steel bar bundle (2) onto the prefabricated corbel (3) at a predetermined position; Step 4: Pull out the steel bar bundle (2) in the post-casting hole (15) to a predetermined length and fix it; Step 5: two joint steel bars (20) are arranged in the post-cast section (6) of the joint node, and one of the joint steel bars (20) is fixedly connected to the top horizontal steel bar (10), and the other joint steel bar (20) is fixedly connected to the bottom horizontal steel bar (11); Step 6: pour concrete into the end node post-casting section (4), the side node post-casting section (5), the joint node post-casting section (6), and the post-casting hole (15) until the concrete emerges from the vent hole (16).

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