A fully prefabricated cavity floor and its manufacturing method and assembly method

Abstract

The present invention discloses a fully prefabricated cavity floor slab, and a manufacturing and assembly method. The fully prefabricated cavity floor slab comprises a concrete main plate, a top steel mesh, a bottom steel mesh, a wood wool board, and a plurality of support members disposed within the concrete main plate. The plurality of support members are spaced apart and connect the bottom steel mesh to the top steel mesh, with the wood wool board positioned between the bottom and top steel meshes. The present invention helps address the current problem that prefabricated building floor slabs generally adopt the form of composite slabs. During the construction of composite slabs, prefabricated slabs must be arranged and installed before casting, resulting in a large amount of construction work. Furthermore, the arrangement of truss reinforcement during composite slab construction seriously affects the smoothness of mechanical and electrical pipeline construction.

Description

Technical Field

[0001] The present invention relates to the technical field of floor slabs, in particular to a fully prefabricated cavity floor slab and a manufacturing method and an assembly method thereof. Background Art

[0002] Floor slabs generally refer to prefabricated slabs, which account for a large proportion of prefabricated structures in buildings. At present, the floor slabs of prefabricated buildings generally adopt the form of composite slabs, that is, "prefabricated layer + cast-in-place layer". During construction, the prefabricated layer is first hoisted and placed in place, and then the truss reinforcement is installed, and then the concrete is poured in place. Compared with traditional cast-in-place floor slabs: 1. During the construction of composite slabs, the prefabricated slabs need to be arranged and installed first and then poured, which requires a large amount of construction work; 2. The arrangement of the truss reinforcement of the composite slab seriously affects the smoothness of the construction of mechanical and electrical pipelines. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a fully prefabricated cavity floor slab which can be fully prefabricated and is convenient for the construction of electromechanical pipelines.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solution: a fully prefabricated cavity floor slab, including a concrete main board and a top steel mesh, a bottom steel mesh, a wood wool board and a plurality of supporting members arranged in the concrete main board, wherein the plurality of supporting members are distributed at intervals and connect the bottom steel mesh with the top steel mesh, and the wood wool board is placed between the bottom steel mesh and the top steel mesh.

[0005] Furthermore, the wood wool board is in a straight strip structure or a plurality of cross-connected structures.

[0006] Furthermore, the plurality of support members adopt truss steel bars, and the plurality of support bars of the plurality of truss steel bars are respectively located on both sides of the wood wool board, and the plurality of connecting bars of the plurality of truss steel bars are respectively connected to the bottom steel mesh and the top steel mesh.

[0007] Furthermore, the support member adopts triangular steel bars, and a plurality of the triangular steel bars are respectively located on both sides of the wood wool board, and the plurality of the triangular steel bars are respectively connected to the bottom steel mesh and the top steel mesh.

[0008] Furthermore, the thickness of the wood wool board is selected in the range of 40-60 mm, and the thickness of the upper concrete pouring layer and the thickness of the lower concrete pouring layer of the wood wool board are both 35 mm.

[0009] A method for manufacturing a fully prefabricated cavity floor slab is applied to the fully prefabricated cavity floor slab. The manufacturing method is as follows:

[0010] S1. Mould cleaning, oiling and assembly;

[0011] S2. Connecting the support member to the bottom steel mesh and installing the bottom steel mesh on the inner bottom of the mold;

[0012] S3. Install the hook in the mold;

[0013] S4, pouring bottom concrete in the mold;

[0014] S5. Arranging the wood wool board on the poured concrete;

[0015] S6. Connecting the top steel mesh to the support member;

[0016] S7, pouring and vibrating the concrete for the second time in the mold;

[0017] S8, component surface treatment;

[0018] S9, component maintenance;

[0019] S10, demoulding and lifting;

[0020] S11. Component quality inspection, numbering and storage.

[0021] A fully prefabricated cavity floor assembly method is applied to the fully prefabricated cavity floor, characterized in that it includes a plate-to-plate assembly method and a plate-to-beam assembly method. The plate-to-plate assembly method is as follows:

[0022] S1. Arrange a prefabricated bottom plate on each side of two fully prefabricated cavity floor slabs, arrange the two fully prefabricated cavity floor slabs symmetrically, and splice and connect the two prefabricated bottom plates;

[0023] S2. Arrange structural steel bars at the splicing location and pour concrete;

[0024] S3. Apply glue at the splicing position;

[0025] The plate-beam assembly method is as follows:

[0026] S1. Install a prefabricated bottom plate on each side of two fully prefabricated cavity floor slabs, symmetrically arrange the two fully prefabricated cavity floor slabs and space the two prefabricated bottom plates apart;

[0027] S2. Supporting cast-in-situ beam molds at intervals and arranging structural steel bars in the supported cast-in-situ beam molds;

[0028] S3, pouring concrete in the mold of the cast-in-situ supporting beam to connect the cast-in-situ supporting beam with the two prefabricated bottom plates;

[0029] S4. Filling the joints between the fully prefabricated cavity floor slab and the cast-in-place beam with epoxy resin.

[0030] The beneficial effects of the present invention are embodied in:

[0031] The fully prefabricated cavity floor slab of the present invention is provided with a concrete main board, a top steel mesh, a bottom steel mesh, a wood wool board and a plurality of support members. In this structure, the presence of the wood wool board is a cavity structure formed during the pouring process of the concrete main board, which reduces the weight of the floor slab itself. The inherent characteristics of the wood wool board give the floor slab certain thermal insulation and sound insulation advantages. By drilling holes in the wood wool board, it is convenient for pipeline arrangement. The structure is cast in one time and is a fully prefabricated cavity floor slab structure, which replaces the prefabrication and cast-in-place process in the construction of the composite slab, reducing the amount of construction work to a certain extent. At the same time, the support members play the role of connecting the truss bars in the composite slab and improving the rigidity of the floor slab. In addition, due to the presence of the wood wool board, the support members are prevented from interfering with the smoothness of the electromechanical pipeline construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a top view of the partial structure of the fully prefabricated cavity floor structure of the present invention using truss steel bars;

[0033] Figure 2 This is a partial top view of the fully prefabricated cavity floor structure of the present invention using triangular steel bars;

[0034] Figure 3 This is a partial structural front view of the fully prefabricated cavity floor structure of the present invention;

[0035] Figure 4 This is a top view of the plate-to-plate connection structure of the present invention;

[0036] Figure 5 is a side sectional view of the plate-plate connection structure of the present invention;

[0037] Figure 6 This is a side view of the plate-beam connection structure of the present invention;

[0038] Figure 7 is a side sectional view of the plate-beam connection structure of the present invention;

[0039] Figure 8 This is a front view of the connector structure of the present invention;

[0040] Figure 9 This is a top view of the connector structure in use;

[0041] Figure 10 This is a front view of the connector of the present invention in a state of use;

[0042] Figure 11 It is a front view of the connector structure in another usage state of the present invention.

[0043] The components in the accompanying drawings are marked as follows: 1. Concrete main board; 2. Top steel mesh; 3. Bottom steel mesh; 4. Wood wool board; 5. Support member; 6. Precast bottom plate; 7. Structural steel bars; 8. Cast-in-place beam; 9. Connecting member; 901. First fastener; 9011. First arc-shaped buckle body; 9012. Second arc-shaped buckle body; 9013. Buckle; 9014. Slot; 9015. Arc-shaped protrusion; 902. Second fastener; 903. First connecting rod; 904. Second connecting rod. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0045] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0046] See also Figures 1 to 11 .

[0047] The fully prefabricated cavity floor of the present invention includes a concrete main board 1 and a top steel mesh 2, a bottom steel mesh 3, a wood wool board 4 and a plurality of support members 5 arranged in the concrete main board 1. The plurality of support members 5 are distributed at intervals and connect the bottom steel mesh 3 with the top steel mesh 2. The wood wool board 4 is placed between the bottom steel mesh 3 and the top steel mesh 2.

[0048] The fully prefabricated cavity floor slab of the present invention is provided with a concrete main board 1, a top steel mesh 2, a bottom steel mesh 3, a wood wool board 4 and a plurality of support members 5. In this structure, the presence of the wood wool board 4 is a cavity structure formed during the pouring process of the concrete main board 1, which reduces the weight of the floor slab itself. The inherent characteristics of the wood wool board 4 make the floor slab have certain thermal insulation and sound insulation advantages. In addition, by drilling holes in the wood wool board 4, it is convenient for pipeline arrangement. The structure is cast in one time and is a fully prefabricated cavity floor slab structure. It replaces the prefabrication and cast-in-place process in the construction of the composite slab, which reduces the construction workload to a certain extent. At the same time, the support members 5 play the role of connecting the truss bars in the composite slab and improving the rigidity of the floor slab. In addition, due to the presence of the wood wool board 4, the support members 5 are prevented from interfering with the smoothness of the construction of the electromechanical pipelines.

[0049] In the present invention, since the compressive strength of the wood wool board 4 is smaller than that of concrete, it may have a negative impact on the stiffness of the floor slab. The support member 5 connects and casts the bottom steel mesh 3 and the top steel mesh 2, which just makes up for the loss of stiffness. At the same time, since the fully prefabricated structure first casts the bottom concrete, then places the wood wool board 4, and then casts the upper concrete, this will cause a time interval between the casting of the upper and lower layers of concrete, which will have an adverse effect on its bonding performance. The support member 5 can better connect the upper and lower layers of concrete, thereby enhancing the integrity of the floor slab.

[0050] In one embodiment, the wood wool boards 4 are in a straight strip structure or a plurality of cross-connected structures. This design allows the cavity floor slab formed by casting to be either a one-way or two-way slab by adjusting the two structures of the wood wool boards 4, thereby meeting different needs. In this embodiment, the straight strips of wood wool boards 4 are one-way slabs, while the cross-connected structures of wood wool boards 4 are two-way slabs.

[0051] In one embodiment, the plurality of support members 5 are constructed from truss steel bars, with the support bars of each truss steel bar positioned on either side of the wood wool board 4. The connecting bars of each truss steel bar are connected to the bottom steel mesh 3 and the top steel mesh 2. This design allows the truss steel bars to be pre-produced at the factory and laid out in a single piece for connection upon use, saving time and labor. Furthermore, in this embodiment, in fully prefabricated structures with straight wood wool boards 4, entire truss steel bars are used. In fully prefabricated structures with multiple cross-connected wood wool boards 4, partial truss steel bars are used.

[0052] In one embodiment, the support members 5 are constructed of triangular steel bars, multiple of which are located on either side of the wood wool board 4 and are connected to the bottom steel mesh 3 and the top steel mesh 2, respectively. This design also allows for connection via triangular steel bars, reducing production costs compared to truss steel bars while achieving the same connection and securing effect. The specific connection locations of the triangular steel bars can be determined based on the location of the wood wool board 4 on site.

[0053] In one embodiment, the wood wool board 4 has a thickness range of 40-60 mm, and both the upper and lower concrete layers are 35 mm thick. This design allows the cavity floor slabs cast using this fully prefabricated structure to have a thickness of approximately 110-130 mm, which is over 20 mm thinner than the 130-150 mm typical composite slabs and cast-in-place slabs. This reduces the weight of the slab by approximately 15%, reduces formwork consumption, water consumption, and dust generation during construction, and meets environmental standards.

[0054] In one embodiment, the plurality of connecting bars of the truss steel bars are respectively connected to the bottom steel mesh 3 and the top steel mesh 2, and the plurality of triangular steel bars are respectively connected to the bottom steel mesh 3 and the top steel mesh 2 through connectors 9, and the connectors 9 include two first fasteners 901, two second fasteners 902, two first connecting rods 903, and two second connecting rods 904;

[0055] The two first fasteners 901 are arranged at intervals, and the two second fasteners 902 are respectively located on both sides of the two first fasteners 901. One end of the two first connecting rods 903 is respectively hinged to one side of the two first fasteners 901, and the other end is respectively hinged to both sides of one second fastener 902. One end of the two second connecting rods 904 is respectively hinged to the other side of the two first fasteners 901, and the other end is respectively hinged to both sides of another second fastener 902. The two first fasteners 901 can be fastened to one steel bar, and the two second fasteners 902 can be fastened to another steel bar. This design allows the connector 9 to meet the needs of fixing two straight steel bars at a cross-intersection, as well as the needs of fixing a straight steel bar and a triangular steel bar at a cross-intersection; when the connector 9 fixes two straight steel bars at a cross-intersection, the two first fasteners 901 are respectively located on both sides of the intersection of the two steel bars, and the two first fasteners 901 are fixed on the same steel bar, and the two second fasteners 902 are fixed on another steel bar; when the connector 9 fixes a straight steel bar and a triangular steel bar at a cross-intersection, similarly, the fixing operation is simple and the fixing effect is good.

[0056] In one embodiment, the first fastener 901 and the second fastener 902 have the same structure, both comprising a first arc-shaped fastener body 9011 and a second arc-shaped fastener body 9012. The first arc-shaped fastener body 9011 is provided with buckles 9013 on both sides, and the second arc-shaped fastener body 9012 is provided with slots 9014 on both sides. The buckles 9013 can be disposed in the slots 9014. This design facilitates the fastening operation through the snap-fitting engagement between the first arc-shaped fastener body 9011 and the second arc-shaped fastener body 9012.

[0057] In one embodiment, the inner sides of the first arc-shaped buckle body 9011 and the second arc-shaped buckle body 9012 are respectively provided with arc-shaped protrusions 9015 for enhancing the fixing effect. This design, through the provision of the arc-shaped protrusions 9015, allows the first arc-shaped buckle body 9011 and the second arc-shaped buckle body 9012 to easily fix the steel bar inside due to the arc structure of the arc-shaped protrusions 9015. When the first arc-shaped buckle body 9011 and the second arc-shaped buckle body 9012 are fixed, the connection with the steel bar is more tightly prevented from slipping.

[0058] A method for manufacturing a fully prefabricated cavity floor slab is applied to the fully prefabricated cavity floor slab. The manufacturing method is as follows:

[0059] S1. Clean, oil, and assemble the mold. In this step, the mold should be cleaned in the order of inside first, then outside, and then the middle, then the sides. Clean the concrete residue inside, outside, and bottom of the mold. After cleaning, the mold should be sorted and organized according to component type, mold type, and mold length for easy access.

[0060] When applying oil, the release agent should be applied thinly and evenly without oil collection or dripping. At the same time, pay attention to the corners and edges of the template. Use soft, absorbent cotton cloth or veil to apply the release agent evenly without leaking any pattern. After applying, a dedicated person should check whether there is any leakage of release agent at the corners, edges, and hand hole boxes of the mold. If so, re-apply the release agent.

[0061] During assembly, the mold should be assembled strictly in accordance with the requirements of the component drawings. The template corner joints should be tight and seamless. When assembling, pay attention to check whether there are any debris in the joints and clean them in time to ensure assembly accuracy. When tightening the bolts during mold assembly, the torque should be controlled at 300N·M. After the mold is assembled and before production, the mold assembly accuracy should be checked. Only qualified ones can enter the next process.

[0062] S2. Connect the support member 5 to the bottom steel mesh 3 and install the bottom steel mesh 3 on the inner bottom of the mold. In this step, when installing the bottom steel mesh 3, ensure that the bottom steel mesh 3 does not interfere with the template and install the corresponding protective layer control parts simultaneously.

[0063] S3. Install the hook in the mold. In this step, the hook should be installed strictly according to the drawings and the installation accuracy should be guaranteed. After the steel bars and hooks are installed, the installation accuracy should be checked and the next step should be carried out after passing the inspection. The hooks and embedded holes of the precast concrete components should be positioned through the mold and installed firmly.

[0064] S4, pouring bottom concrete in the mold;

[0065] S5, arranging the wood wool board 4 on the poured concrete;

[0066] S6, connecting the top steel mesh 2 to the support member 5;

[0067] S7. Pour and vibrate the concrete a second time in the mold. In this step, the accuracy of the electronic weighing system of the concrete mixing system must be regularly checked. When vibrating the concrete, a vibrating table should be used. The following conditions indicate that the concrete has been vibrated: the concrete surface has stopped sinking or the sinking is not obvious, bubbles no longer appear on the concrete surface or mortar has appeared, and the concrete has filled the edges and corners of the formwork with mortar.

[0068] S8, component surface treatment; in this step, the surface treatment process and treatment methods of various components are different, such as wallboard smoothing, composite board roughening, etc. The specific requirements should be based on the actual requirements of the component drawings;

[0069] S9. Component curing: In this step, the curing process for precast concrete component assembly line production generally adopts heating curing. The curing process is divided into four stages: static stop, heating, constant temperature, and cooling. The heating rate shall not exceed 15° per hour, the maximum temperature shall not exceed 70°, and the cooling rate shall not exceed 20° per hour. During the entire curing process, a dedicated person shall be responsible for temperature measurement and monitoring.

[0070] S10, demoulding and lifting; in this step, the precast concrete components are demoulded and lifted when their strength reaches 75% of the design value, and the component strength during lifting should not be less than 15MPa; when lifting precast concrete components, unilateral or forced lifting is not allowed, the lifting device must be vertical during lifting, and the components must be stable and without significant shaking during transportation; after the precast concrete components are demoulded, they should be inspected for appearance. Appearance quality defects should be inspected according to the severity of their impact on structural performance, installation and use functions;

[0071] S11, component quality inspection, numbering, and storage. In this step, after the precast concrete components are produced, they must undergo quality self-inspection and pass the acceptance before they can be stored.

[0072] A fully prefabricated cavity floor assembly method is applied to the fully prefabricated cavity floor, characterized in that it includes a plate-to-plate assembly method and a plate-to-beam assembly method. The plate-to-plate assembly method is as follows:

[0073] S1. Arrange a prefabricated bottom plate 6 on each side of two fully prefabricated cavity floor slabs, arrange the two fully prefabricated cavity floor slabs symmetrically, and splice and connect the two prefabricated bottom plates 6. In this step, the prefabricated bottom plates 6 are arranged on the sides of the fully prefabricated cavity floor slabs. The longitudinal section is L-shaped when viewed from the side, and the top, bottom, and sides of the prefabricated bottom plates 6 are flush with the horizontal planes of the top, bottom, and sides of the fully prefabricated cavity floor slabs. When the two fully prefabricated cavity floor slabs are spliced ​​together, the two prefabricated bottom plates 6 are spliced ​​to form a casting connection interval.

[0074] S2. Arrange structural steel bars 7 at the splicing position and pour concrete; in this step, a small amount of structural steel bars 7 are arranged in the pouring connection interval formed by the prefabricated base plate 6 to resist temperature and shrinkage stress, and the plates are connected after pouring concrete, which makes construction more convenient.

[0075] S3, glue is applied at the splicing position; in this step, Figure 9 as well as Figure 8 Fill the gaps between the boards at position A with glue to reduce the possibility of leakage through the board side seams;

[0076] The plate-beam assembly method is as follows:

[0077] S1. Arrange a precast base plate 6 on each side of two fully precast cavity floor slabs, symmetrically arrange the two fully precast cavity floor slabs, and space the two precast base plates 6 apart. In this step, the precast base plates 6 are straight and arranged on the sides of the fully precast cavity floor slabs, flush with the horizontal surface of the bottom of the fully precast cavity floor slabs, and the two precast base plates 6 are spaced apart to form a pouring connection interval.

[0078] S2. Supporting the mold of the cast-in-situ beam 8 at the interval position, and arranging the structural steel bars 7 in the mold of the cast-in-situ beam 8; in this step, the cast-in-situ beam 8 is provided with a small amount of structural steel bars 7 to resist temperature and shrinkage stress, and the plate and the beam are connected after pouring concrete, which is convenient for construction;

[0079] S3. Pour concrete into the mold of the supporting cast-in-situ beam 8 to connect the supporting cast-in-situ beam 8 with the two prefabricated bottom plates 6. In this step, the cast-in-situ beam 8 is T-shaped, with the horizontal portion located on the prefabricated bottom plates 6 of the two fully prefabricated cavity floor slabs and the vertical portion located below the prefabricated bottom plates 6.

[0080] S4, use epoxy resin to fill the joints between the prefabricated cavity floor and the cast-in-place beam 8. Figure 10 as well as Figure 11The gap between the plate and the beam is enhanced by filling the gap with epoxy resin at position B.

[0081] It should be understood that the examples and implementation methods described herein are for illustrative purposes only and are not intended to limit the present invention. Those skilled in the art may make various modifications or changes based on them. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A fully prefabricated cavity floor, characterized in that: The invention comprises a concrete main board (1), a top steel mesh (2), a bottom steel mesh (3), a wood wool board (4), and a plurality of supporting members (5) arranged in the concrete main board (1). The plurality of supporting members (5) are spaced apart and connect the bottom steel mesh (3) with the top steel mesh (2). The wood wool board (4) is placed between the bottom steel mesh (3) and the top steel mesh (2) and passes through the concrete main board (1). Holes are drilled in the wood wool board (4) for pipeline arrangement.

2. The fully prefabricated cavity floor according to claim 1, characterized in that: The wood wool board (4) is in a straight strip structure or in a plurality of cross-connected structures.

3. The fully prefabricated cavity floor according to claim 2, characterized in that: The plurality of support members (5) are made of truss steel bars, and the plurality of support bars of the plurality of truss steel bars are respectively located on both sides of the wood wool board (4), and the plurality of connection bars of the plurality of truss steel bars are respectively connected to the bottom steel mesh (3) and the top steel mesh (2).

4. The fully prefabricated cavity floor according to claim 2, characterized in that: The support member (5) is made of triangular steel bars, and a plurality of the triangular steel bars are respectively located on both sides of the wood wool board (4), and the plurality of the triangular steel bars are respectively connected to the bottom steel mesh (3) and the top steel mesh (2).

5. The fully prefabricated cavity floor according to claim 3 or 4, characterized in that: The thickness of the wood wool board (4) is selected in the range of 40-60 mm, and the thickness of the upper concrete pouring layer and the thickness of the lower concrete pouring layer of the wood wool board (4) are both 35 mm.

6. A method for manufacturing a fully prefabricated cavity floor, applied to the fully prefabricated cavity floor according to claim 1, characterized in that: Here’s how to make it: S1. Mould cleaning, oiling and assembly; S2, connecting the support member (5) to the bottom steel mesh (3) and installing the bottom steel mesh (3) on the inner bottom of the mold; S3. Install the hook in the mold; S4, pouring bottom concrete in the mold; S5, arranging the wood wool board (4) on the poured concrete; S6, connecting the top steel mesh (2) to the support member (5); S7, pouring and vibrating the concrete for the second time in the mold; S8, component surface treatment; S9, component maintenance; S10, demoulding and lifting; S11. Component quality inspection, numbering and storage.

7. A method for assembling a fully prefabricated cavity floor, applied to the fully prefabricated cavity floor according to claim 1, characterized in that: It includes the plate-plate assembly method and the plate-beam assembly method. The plate-plate assembly method is as follows: S1. Arrange a prefabricated bottom plate (6) on each side of two fully prefabricated cavity floor plates, arrange the two fully prefabricated cavity floor plates symmetrically, and splice and connect the two prefabricated bottom plates (6); S2, arranging structural steel bars (7) at the splicing position and pouring concrete; S3. Apply glue at the splicing position; The plate-beam assembly method is as follows: S1. Arrange a prefabricated bottom plate (6) on each side of two fully prefabricated cavity floor plates, arrange the two fully prefabricated cavity floor plates symmetrically, and arrange the two prefabricated bottom plates (6) at intervals; S2, supporting a cast-in-situ beam (8) mold at an interval position, and arranging structural steel bars (7) in the supporting cast-in-situ beam (8) mold; S3, pouring concrete in the mold of the cast-in-situ supporting beam (8), and connecting the cast-in-situ supporting beam (8) with the two prefabricated bottom plates (6); S4. Using epoxy resin to fill the joints between the fully prefabricated cavity floor slab and the cast-in-place beam (8).

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