A large-span lightweight composite flat slab structure and its construction method

Abstract

This invention discloses a large-span lightweight composite flat slab structure and construction method, specifically relating to the field of flat slab technology. The structure includes a concrete slab with a reinforcing mesh inside, comprising multiple vertically distributed transverse and longitudinal reinforcing cages. This invention uses multiple first I-shaped blocks to limit and assemble the transverse reinforcing bars, and multiple second I-shaped blocks to limit and assemble the longitudinal reinforcing bars. The transverse reinforcing bars and the first I-shaped blocks are then perpendicularly intersected to form the reinforcing mesh. Simultaneously, multiple lightweight hollow frames are fixed between the transverse and longitudinal reinforcing cages of the reinforcing mesh using the transverse and longitudinal limiting reinforcing bars. This reduces the workload of binding the transverse and longitudinal reinforcing bars with steel wire, improves the installation and fixing efficiency of the reinforcing mesh, and the addition of lightweight hollow frames in the middle reduces the overall weight of the flat slab, making it highly practical.

Description

Technical Field

[0001] This invention relates to the field of flat slab technology, specifically to a large-span lightweight composite flat slab structure and its construction method. Background Technology

[0002] Underground parking garages have fewer internal partition walls, resulting in fewer load-bearing walls. Therefore, the load-bearing capacity of the garage roof must be carefully considered during construction. The main structural forms for garage roof slabs are beam-slab systems and flat slab systems. Beam-slab systems offer high simulation accuracy in calculation software, and most building structural floors utilize this system. This structural system provides clear vertical stress distribution, a clear force transmission path, good seismic performance, and flexibility in opening and raising / lowering floor slabs, while also saving on steel reinforcement and concrete usage. However, beam-slab systems reduce interior ceiling height and usable space; increase column and wall height, excavation depth, and the length of some equipment pipelines, increasing construction costs; and require a large amount of formwork, more labor, and lower formwork construction efficiency.

[0003] Compared to beam-slab systems, flat slab systems are more economical. Flat slab systems have high headroom utilization, aesthetically pleasing appearance, and are conducive to the layout and construction of ventilation, air conditioning, and fire protection pipelines. When used in basement structures, they can effectively reduce building height while meeting the same headroom requirements, thereby reducing earthwork excavation. In terms of construction, buildings using flat slab structures have advantages such as simple formwork support, saving on formwork, convenient floor reinforcement binding, and convenient equipment installation, which greatly improves construction speed.

[0004] Currently, in the construction of underground parking garages, when constructing flat slab structures, the required amount of steel reinforcement is usually calculated first, then the density of the steel mesh is determined, the steel mesh is tied, the formwork is fixed, and then the concrete is poured. In such flat slab structures, fixing and tying the steel mesh is quite troublesome, the efficiency of fixing and tying is low, the workload is large, and if the amount of bottom steel reinforcement is insufficient, safety accidents are likely to occur. Summary of the Invention

[0005] The purpose of this invention is to provide a large-span lightweight composite flat slab structure to address the aforementioned shortcomings in the technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a large-span lightweight composite flat slab structure, comprising:

[0007] A concrete slab, wherein a steel mesh is provided inside the concrete slab, the steel mesh comprising multiple vertically distributed transverse steel cages and longitudinal steel cages;

[0008] Two support columns are provided at the bottom of the concrete slab. The top of each support column is fixed with a column cap, and the top of the column cap is in contact with the bottom of the concrete slab. The top of each column cap is provided with a reinforcing component, which is located between multiple transverse steel cages. Multiple square spaces are formed between the multiple transverse steel cages, longitudinal steel cages and reinforcing components. A lightweight hollow frame is provided inside each square space.

[0009] Preferably, the reinforcing component includes a pre-embedded screw fixed to the top of the column cap, the bottom end of the pre-embedded screw extending into the column cap and the interior of the support column, a support pad fixed to the top of the column cap, the top of the pre-embedded screw passing through the support pad and extending to the top of the support pad, a T-shaped support plate at the top of the two support pads, the T-shaped support plate being disposed between multiple transverse steel cages and a lightweight hollow frame, a first connecting hole being opened at both ends of the T-shaped support plate, the two pre-embedded screws passing through the interior of the two first connecting holes respectively, and a fixing nut threadedly connected to the top of the pre-embedded screw.

[0010] Preferably, the transverse steel cage includes four transverse steel bars, and a plurality of first I-shaped blocks are provided between the four transverse steel bars. First limiting rings are fixed on both sides of the top and bottom ends of the first I-shaped blocks, and the four transverse steel bars pass through the interior of the four first limiting rings on the first I-shaped blocks respectively.

[0011] Preferably, the longitudinal reinforcement cage includes four longitudinal reinforcement bars, and a plurality of second I-shaped blocks are provided between the four longitudinal reinforcement bars. The top and bottom sides of the second I-shaped blocks are fixed with second limiting rings, and the four longitudinal reinforcement bars pass through the interior of the four second limiting rings on the second I-shaped blocks respectively.

[0012] Preferably, multiple transverse limiting reinforcing bars are provided between the multiple transverse reinforcing cages, and the multiple transverse limiting reinforcing bars are distributed at intervals with the multiple transverse reinforcing cages. A second connecting hole is provided on the second I-shaped block, and a third connecting hole is provided on both transverse sides of the lightweight hollow frame. The transverse limiting reinforcing bars pass through the interior of the multiple second connecting holes and the third connecting holes.

[0013] Preferably, multiple longitudinal limiting bars are provided between the multiple longitudinal reinforcing cages, and the multiple longitudinal limiting bars are distributed at intervals with the multiple longitudinal reinforcing cages. The longitudinal limiting bars are distributed perpendicularly to the transverse limiting bars. A fourth connecting hole is provided on the first I-shaped block, and a fifth connecting hole is provided on both vertical sides of the lightweight hollow frame. The longitudinal limiting bars pass through the interior of the multiple fourth connecting holes and the fifth connecting holes, and the longitudinal limiting bars pass through the T-shaped support plate.

[0014] Preferably, the top of the T-shaped support plate is provided with a limiting plate, and the bottom of the limiting plate is provided with multiple limiting grooves. The longitudinal limiting steel bars at the top of the multiple longitudinal steel cages pass through the interior of the multiple limiting grooves respectively. The limiting plate is provided with a sixth connecting hole at both ends. The top of the pre-embedded screw passes through the interior of the sixth connecting hole, and the fixing nut is provided at the top of the limiting plate.

[0015] Preferably, the bottom end of the limiting plate is fixedly provided with two positioning rods, and the top end of the T-shaped support plate is provided with two positioning grooves. The positioning grooves are located inside the first connecting hole, and the positioning rods are located inside the positioning grooves.

[0016] Preferably, the lightweight hollow frame is made of lightweight fiber composite material or lightweight metal material.

[0017] Preferably, the first I-shaped block and the second I-shaped block are made of lightweight metal material.

[0018] Preferably, the T-shaped support plate is provided with a longitudinal through hole and a second longitudinal through hole, the longitudinal through hole being for the longitudinal limiting steel bar to pass through.

[0019] A construction method for large-span lightweight composite flat slabs, the construction steps are as follows:

[0020] Step 1: Erection of templates and support system

[0021] Install support pads on the column cap at the top of the support column, ensuring that the top of the pre-embedded screw is exposed on the outside of the support pad;

[0022] A support system is erected in the area between the support columns, and a bottom formwork and floor slab side plates are installed on top of the support system. The area between the bottom formwork and the column cap is sealed.

[0023] Step 2, Assemble the steel mesh

[0024] T-shaped support plates are inserted into the steel mesh, and a lightweight hollow frame is installed between the longitudinal and transverse steel cages of the steel mesh. The lightweight hollow frame is fixed by longitudinal and transverse limiting steel bars. The longitudinal limiting steel bars are inserted into the longitudinal insertion holes to fix the lightweight hollow frame between the longitudinal and transverse steel cages.

[0025] A standard plate is installed between two adjacent first I-shaped blocks and between two adjacent second I-shaped blocks. The two ends of the standard plate are provided with stepped grooves that fit against the side walls of the corresponding I-shaped blocks. The length of the standard plate is equal to the spacing between two adjacent unidirectional limiting steel bars, and the stepped grooves are provided with through holes for inserting the corresponding limiting steel bars.

[0026] By using longitudinal and transverse limiting steel bars and standard plates, the first and second I-shaped blocks are neatly distributed to ensure the strength of the large-span structure;

[0027] Longitudinal reinforcement bars are inserted into the fourth connecting hole of the first I-shaped block on the transverse steel cage near the edge to strengthen the structural strength at the edge.

[0028] Step 3, Install the reinforcing mesh

[0029] The assembled steel mesh is hoisted to the top of the template via a trolley crane connected to a T-shaped support plate. The posture and position of the steel mesh are adjusted, and it is lowered vertically, ensuring that the first connecting hole and the pre-embedded bolt are properly inserted and matched.

[0030] The trolley crane hook detaches from the T-shaped support plate, and the limiting plate is installed on the top of the T-shaped support plate. Ensure that the positioning rod and positioning groove are properly installed, the sixth connecting hole and the pre-embedded screw are properly installed, and the longitudinal steel bar is located in the limiting groove. Adjust the fixing nut to fix the limiting plate.

[0031] Step 4: Cast-in-place concrete

[0032] Concrete is poured in place within the area enclosed by the bottom formwork and the side panels of the floor slab. After the concrete reaches the set strength, the formwork is removed to obtain a beamless lightweight composite floor slab.

[0033] The technical effects and advantages provided by the present invention in the above technical solution are as follows:

[0034] 1. Multiple first I-shaped blocks are used to limit and assemble the transverse reinforcing bars, and multiple second I-shaped blocks are used to limit and assemble the longitudinal reinforcing bars. Then, multiple transverse reinforcing bars and first I-shaped blocks are perpendicularly intersected to form a reinforcing mesh. At the same time, multiple lightweight hollow frames are fixed between multiple transverse and longitudinal reinforcing cages of the reinforcing mesh by transverse and longitudinal reinforcing bars and longitudinal limiting reinforcing bars. This reduces the workload of using steel wire to tie transverse and longitudinal reinforcing bars, improves the installation and fixing efficiency of the reinforcing mesh, and the addition of lightweight hollow frames in the middle can reduce the weight of the entire flat slab. It can also control the spacing of transverse and longitudinal reinforcing bars, improve the correlation between two longitudinal reinforcing cages or two transverse reinforcing cages, ensure the realization of large-span construction scenarios, and prevent floating of cast-in-place concrete. It has strong practicality. The reinforcing components can transfer forces between supporting columns, which can act as a false beam and improve the safety of the flat slab.

[0035] 2. The longitudinal steel bars on the longitudinal steel cage and the T-shaped support plate are connected together by the limiting plate, which makes the connection between the steel mesh and the reinforcing components more stable and facilitates the subsequent pouring work.

[0036] 3. By using standard plates to restrict the position of adjacent I-beams, and in conjunction with lightweight hollow frames, the regular distribution of I-beams is achieved, thereby realizing the structural strength and stability in the case of large spans.

[0037] 4. By assembling the steel mesh before hoisting it, the construction steps are simplified, construction is easier, and the construction period is shortened. During construction, the bottom formwork and column caps are used to achieve sealing, preventing leakage and ensuring that the floor slab structure is dense to prevent honeycomb or pitting problems. Attached Figure Description

[0038] To more clearly illustrate the technical solution of this application, the accompanying drawings used in the invention will be briefly introduced below.

[0039] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0040] Figure 2 This is a schematic diagram of the connection structure between the steel mesh and the lightweight hollow frame of the present invention.

[0041] Figure 3 This is a three-dimensional cross-sectional view of the concrete slab structure of the present invention.

[0042] Figure 4 This is a schematic diagram of the three-dimensional structure of the transverse steel cage of the present invention.

[0043] Figure 5 This is a schematic diagram of the three-dimensional structure of the first I-shaped block of the present invention.

[0044] Figure 6 This is a schematic diagram of the three-dimensional structure of the longitudinal steel cage of the present invention.

[0045] Figure 7 This is a schematic diagram of the three-dimensional structure of the second I-shaped block of the present invention.

[0046] Figure 8 This is a schematic diagram of the connection structure of the lightweight hollow frame, the transverse limiting steel bars and the longitudinal limiting steel bars of the present invention.

[0047] Figure 9 This is a schematic diagram of the three-dimensional cross-sectional structure of the lightweight hollow frame of the present invention. Figure 1 .

[0048] Figure 10 This is a schematic diagram of the three-dimensional cross-sectional structure of the lightweight hollow frame of the present invention. Figure 2 .

[0049] Figure 11 This is a three-dimensional structural diagram of the T-shaped support plate and limiting plate of the present invention.

[0050] Figure 12 For the present invention Figure 11 A schematic diagram of the enlarged structure of A.

[0051] Figure 13 This is a three-dimensional structural diagram of the column cap, embedded screw, and support pad of the present invention.

[0052] Figure 14 This is a diagram showing the positional relationship between the column cap and the bottom template of this invention.

[0053] Figure 15 This is a structural diagram of the sealing strip between the bottom template and the column cap of the present invention.

[0054] Figure 16 This is a structural diagram of the column cap and bottom template of the present invention before the sealing strip is assembled.

[0055] Explanation of reference numerals in the attached figures:

[0056] 1. Concrete slab; 2. Reinforcing mesh; 3. Transverse reinforcing cage; 4. Longitudinal reinforcing cage; 5. Lightweight hollow frame; 6. Support column; 7. Column cap; 8. Embedded bolt; 9. Support pad; 10. T-shaped support plate; 11. First connecting hole; 12. Fixing nut; 13. Transverse reinforcing bar; 14. First I-shaped block; 15. First limiting ring; 16. Longitudinal reinforcing bar; 17. Second I-shaped block; 18. Second limiting ring; 19. Transverse limiting reinforcing bar; 20. Second connecting hole; 21. Third connecting hole; 22. Longitudinal limiting reinforcement; 23. Fourth connecting hole; 24. Fifth connecting hole; 25. Limiting plate; 26. Limiting groove; 27. Sixth connecting hole; 28. Positioning rod; 29. ​​Positioning groove; 30. Bottom template; 31. Sealing strip; 311. Moving part; 312. Sealing part; 3121. Arc-shaped piece one; 3122. Arc-shaped piece two; 3123. Pre-compression body; 313. Wheel assembly. Detailed Implementation

[0057] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0058] This invention provides, for example Figures 1 to 10 The large-span lightweight composite flat slab structure shown includes:

[0059] A concrete slab 1, with a steel mesh 2 inside the concrete slab 1, the steel mesh 2 including multiple vertically distributed transverse steel cages 3 and longitudinal steel cages 4.

[0060] Two support columns 6 are located at the bottom of the concrete slab 1. Column caps 7 are fixed to the top of the support columns 6, and the top of the column caps 7 contacts the bottom of the concrete slab 1. Reinforcing components are provided at the top of the two column caps 7. The reinforcing components are located between multiple transverse steel cages 3. Multiple square spaces are formed between the multiple transverse steel cages 3, the longitudinal steel cages 4, and the reinforcing components. Lightweight hollow frames 5 are provided inside the square spaces. The lightweight hollow frames 5 are made of lightweight fiber composite materials or lightweight metal materials.

[0061] The reinforcing component includes a pre-embedded screw 8 fixedly installed at the top of the column cap 7. The bottom end of the pre-embedded screw 8 extends into the column cap 7 and the support column 6. A support pad 9 is fixedly installed at the top of the column cap 7. The top of the pre-embedded screw 8 passes through the support pad 9 and extends to the top of the support pad 9. A T-shaped support plate 10 is installed at the top of the two support pads 9. The T-shaped support plate 10 is located between multiple transverse steel cages 3 and the lightweight hollow frame 5. A first connecting hole 11 is opened at both ends of the T-shaped support plate 10. The two pre-embedded screws 8 pass through the two first connecting holes 11 respectively. A fixing nut 12 is threadedly connected to the top of the pre-embedded screw 8.

[0062] The transverse steel cage 3 includes four transverse steel bars 13, and multiple first I-shaped blocks 14 are provided between the four transverse steel bars 13. First limiting rings 15 are fixed on both sides of the top and bottom of the first I-shaped blocks 14. The four transverse steel bars 13 pass through the interior of the four first limiting rings 15 on the first I-shaped blocks 14 respectively.

[0063] The longitudinal steel cage 4 includes four longitudinal steel bars 16, and multiple second I-shaped blocks 17 are provided between the four longitudinal steel bars 16. Second limiting rings 18 are fixed on both sides of the top and bottom ends of the second I-shaped blocks 17. The four longitudinal steel bars 16 pass through the interior of the four second limiting rings 18 on the second I-shaped blocks 17 respectively. The first I-shaped block 14 and the second I-shaped block 17 are made of lightweight metal materials.

[0064] Multiple transverse reinforcing bars 19 are provided between multiple transverse reinforcing cages 3. The multiple transverse reinforcing bars 19 are distributed at intervals with the multiple transverse reinforcing cages 3. A second connecting hole 20 is provided on the second I-shaped block 17. A third connecting hole 21 is provided on both sides of the lightweight hollow frame 5. The transverse reinforcing bars 19 pass through the interior of the multiple second connecting holes 20 and the third connecting holes 21.

[0065] Multiple longitudinal reinforcing cages 4 are provided with multiple longitudinal limiting reinforcing bars 22, which are distributed at intervals with the multiple longitudinal reinforcing cages 4. The longitudinal limiting reinforcing bars 22 are distributed perpendicularly with the transverse limiting reinforcing bars 19. A fourth connecting hole 23 is opened on the first I-shaped block 14. A fifth connecting hole 24 is opened on both vertical sides of the lightweight hollow frame 5. The longitudinal limiting reinforcing bars 22 pass through the interior of the multiple fourth connecting holes 23 and the fifth connecting holes 24. The longitudinal limiting reinforcing bars 22 penetrate the T-shaped support plate 10.

[0066] Arrange multiple I-shaped blocks 14 neatly, and then place four transverse reinforcing bars 13 at the four corners of the I-shaped blocks 14, so that the transverse reinforcing bars 13 pass through the inside of the first limiting rings 15 on the I-shaped blocks 14. This forms a transverse reinforcing cage 3. Figure 4As shown, similarly, multiple second I-shaped blocks 17 are arranged neatly, and then four longitudinal reinforcing bars 16 are placed at the four corners of the second I-shaped blocks 17, so that the longitudinal reinforcing bars 16 pass through the inside of the second limiting rings 18 on the second I-shaped blocks 17. In this way, a longitudinal reinforcing cage 4 can be formed, as shown. Figure 6 As shown.

[0067] Multiple transverse reinforcing cages 3 and multiple longitudinal reinforcing cages 4 are vertically and evenly interwoven to form a reinforcing mesh 2. A T-shaped support plate 10 is inserted between the transverse reinforcing cages 3, passing through the longitudinal reinforcing bars 16 distributed vertically on the longitudinal reinforcing cages 4. Then, multiple lightweight hollow frames 5 are placed inside the space formed by the transverse reinforcing cages 3, longitudinal reinforcing cages 4, and T-shaped support plate 10. Transverse limiting reinforcing bars 19 are then passed through the second connecting hole 20 on the second I-shaped block 17 and the third connecting hole 21 on the lightweight hollow frame 5. Finally, longitudinal limiting reinforcing bars 22 are passed through the fourth connecting hole 23 on the first I-shaped block 14 and the fifth connecting hole 24 on the lightweight hollow frame 5. This completes the installation of the reinforcing mesh 2, lightweight hollow frames 5, and reinforcing components. Figure 2 As shown.

[0068] This invention uses multiple first I-shaped blocks 14 to limit and assemble the transverse reinforcing bars 13, and multiple second I-shaped blocks 17 to limit and assemble the longitudinal reinforcing bars 16. Then, the multiple transverse reinforcing bars 13 and the first I-shaped blocks 14 intersect perpendicularly to form a reinforcing mesh 2. Simultaneously, multiple lightweight hollow frames 5 are fixed between the multiple transverse reinforcing cages 3 and longitudinal reinforcing cages 4 of the reinforcing mesh 2 using transverse limiting reinforcing bars 19 and longitudinal limiting reinforcing bars 22. This reduces the workload of binding the transverse and longitudinal reinforcing bars 13 and 16 with steel wire, improves the installation and fixing efficiency of the reinforcing mesh 2, and the addition of lightweight hollow frames 5 in the middle reduces the weight of the entire flat slab. The quantity is large and the practicality is strong. The reinforcing components can transfer force between the supporting columns 6, which acts as a false beam and improves the safety of the flat slab. This implementation method specifically solves the problem that in the construction of underground garages, when constructing flat slab structures, most of the time the required amount of steel bars is calculated first, then the density of the steel mesh is determined, then the steel mesh is tied, then the formwork is fixed, and then the concrete is poured. In such flat slab structures, the fixing and tying of the steel mesh is relatively troublesome, the fixing and tying efficiency is low, the workload is large, and if the number of bottom steel bars is insufficient, safety accidents are likely to occur.

[0069] This invention provides, for example Figure 2 , Figures 11 to 13The diagram illustrates a large-span lightweight composite flat slab structure. The T-shaped support plate 10 has longitudinal through holes 30 and 31. The longitudinal through holes 30 allow longitudinal limiting reinforcing bars 22 to pass through, ensuring structural stability and facilitating longitudinal tension, thus reducing the bending of the large-span slab. A limiting plate 25 is located at the top of the T-shaped support plate 10, with multiple limiting grooves 26 at its bottom. The longitudinal limiting reinforcing bars 22 at the top of multiple longitudinal reinforcing cages 4 pass through these grooves. A sixth connecting hole 27 is located at both ends of the limiting plate 25, with the top of a pre-embedded screw 8 passing through the sixth connecting hole 27. A fixing nut 12 is located at the top of the limiting plate 25. Two positioning rods 28 are fixedly located at the bottom of the limiting plate 25. Two positioning grooves 29 are located at the top of the T-shaped support plate 10, inside the first connecting hole 11, with the positioning rods 28 located inside the positioning grooves 29.

[0070] After assembling the steel mesh 2 and the lightweight hollow frame 5, place the steel mesh 2 and the T-shaped support plate 10 on top of multiple support columns 6 and column caps 7, so that the top of the pre-embedded screw 8 passes through the first connecting hole 11 on the T-shaped support plate 10. Then, place the limiting plate 25 on top of the T-shaped support plate 10, so that the positioning rod 28 is inserted into the positioning groove 29 on the T-shaped support plate 10. In this way, the limiting groove 26 will be locked at the top of multiple longitudinal steel bars 16 located at the top, and the limiting plate 25 will limit and clamp the longitudinal steel bars 16. At this time, fix the fixing nut 12 to the pre-embedded screw. At the top of rod 8, the fixing nut 12 will fix the limiting plate 25 to the top of the T-shaped support plate 10, so that the T-shaped support plate 10 and the longitudinal steel cage 4 will be connected together. Then, the template is fixed at the bottom of the steel mesh 2, and then the concrete is poured, thus forming the concrete slab 1. The steel mesh 2 and other components will be embedded inside the concrete slab 1. The present invention uses the limiting plate 25 to limit and connect the longitudinal steel bars 16 on the longitudinal steel cage 4 and the T-shaped support plate 10 together, making the connection between the steel mesh 2 and the reinforcing components more stable and facilitating the subsequent pouring work.

[0071] A construction method for large-span lightweight composite flat slabs, the construction steps are as follows:

[0072] Step 1: Erection of templates and support system

[0073] Install support pads 9 on the column caps 7 at the top of the support column 6, ensuring that the top of the pre-embedded screw 8 is exposed on the outside of the support pads 9;

[0074] like Figures 14 to 16As shown, a support system is erected in the area between the support columns 6, and a bottom template 30 and floor slab side plates are installed on top of the support system. A sealing treatment is applied between the bottom template 30 and the column cap 7. A sealing strip 31 is installed on the side of the column cap 7. The sealing strip 31 has a movable part 311 at the bottom and a sealing part 312 at the top. When the bottom template 30 is installed, it moves upwards against the movable part 311, causing the sealing part 312 to extend outwards and adhere to the bottom template 30. As the upward movement increases, the adhesion strength of the sealing part 312 increases. The movable part 311 includes an annular thin plate integrally connected to the sealing strip 31. A wheel assembly 313 is vertically slidably installed inside the annular thin plate. The bottom template 30 moves upwards and adheres to the annular thin plate, driving the wheel assembly 313 upwards and pressing the sealing part 312 outwards. The sealing part 312 includes an arc-shaped piece 3121 and an arc-shaped piece 3122, and a connection between the arc-shaped piece 3121 and the arc-shaped piece 3122. The pre-compression body 3123 between the two curved pieces 3122 has a lower middle height than the two ends of the first curved piece 3121, and a higher middle height than the two ends of the second curved piece 3122. The wheel assembly 313 moves upward through the annular thin sheet, causing the first curved piece 3121 and the second curved piece 3122 to extend outward, so that their ends fit against the bottom template 30. As the bottom template 30 continues to move upward, the wheel assembly 313 will continue to compress the second curved piece 3122, so that the second curved piece 3122 continues to... The continuous bending and extrusion of the pre-compression body 3123 makes the end of the arc-shaped piece 3121 fit more firmly against the bottom template 30. Secondly, the end of the arc-shaped piece 3122 will push against the back of the arc-shaped piece 3121 to ensure the sealing effect. Furthermore, even when the wheel assembly 3123 loses its supporting effect, the arc-shaped piece 3122 will not leak. Because the end of the arc-shaped piece 3122 will increase the contact force with the bottom template 30, multiple sealing effects are achieved.

[0075] Step 2, Assemble the steel mesh 2

[0076] T-shaped support plates 10 are inserted into the steel mesh 2. A lightweight hollow frame 5 is installed between the longitudinal steel cage 4 and the transverse steel cage 3 of the steel mesh 2. The lightweight hollow frame 5 is fixed by longitudinal limiting steel bars 22 and transverse limiting steel bars 19. The longitudinal limiting steel bars 22 are inserted into the longitudinal insertion hole 30 to fix the lightweight hollow frame 5 between the longitudinal steel cage 4 and the transverse steel cage 3.

[0077] A standard plate is installed between two adjacent first I-shaped blocks 14 and between two adjacent second I-shaped blocks 17. The two ends of the standard plate are provided with stepped grooves that fit against the side walls of the corresponding I-shaped blocks. The length of the standard plate is equal to the spacing between two adjacent unidirectional limiting steel bars, and the stepped grooves are provided with through holes for inserting the corresponding limiting steel bars.

[0078] The first I-shaped block 14 and the second I-shaped block 17 are neatly distributed using longitudinal limiting steel bars 22, transverse limiting steel bars 19, and standard plates to ensure the strength of the large-span structure.

[0079] Longitudinal reinforcement bars are inserted into the fourth connecting hole 23 on the first I-shaped block 14 of the transverse steel cage 3 near the edge to strengthen the structural strength at the edge.

[0080] Step 3, Install steel mesh 2

[0081] The assembled steel mesh 2 is hoisted to the top of the template via a trolley crane connected to the T-shaped support plate 10. The posture and position of the steel mesh 2 are adjusted, and it is lowered vertically, ensuring that the first connecting hole 11 and the pre-embedded screw 8 are inserted and matched.

[0082] The trolley crane hook detaches from the T-shaped support plate 10 and the limiting plate 25 is installed on the top of the T-shaped support plate 10. It is ensured that the positioning rod 28 and the positioning groove 29 are installed in a compatible manner, the sixth connecting hole 27 and the pre-embedded screw 8 are installed in a compatible manner, and the longitudinal steel bar 16 is located in the limiting groove 26. The fixing nut 12 is adjusted to fix the limiting plate 25.

[0083] Step 4: Cast-in-place concrete

[0084] Concrete is poured in place within the area enclosed by the bottom formwork and the side panels of the floor slab. After the concrete reaches the set strength, the formwork is removed to obtain a beamless lightweight composite floor slab.

Claims

1. A large-span lightweight composite flat slab structure, characterized in that, include: A concrete slab (1) is provided with a steel mesh (2) inside the concrete slab (1). The steel mesh (2) includes multiple vertically distributed transverse steel cages (3) and longitudinal steel cages (4). Two support columns (6) are provided at the bottom of the concrete slab (1). The top of the support column (6) is fixedly provided with a column cap (7). The top of the column cap (7) is in contact with the bottom of the concrete slab (1). The top of the two column caps (7) is provided with a reinforcing component. The reinforcing component is provided between multiple transverse steel cages (3). Multiple square spaces are formed between the multiple transverse steel cages (3), the longitudinal steel cages (4) and the reinforcing component. A lightweight hollow frame (5) is provided inside the square space. The reinforcing component includes a pre-embedded screw (8) fixedly installed at the top of the column cap (7). The bottom end of the pre-embedded screw (8) extends into the column cap (7) and the support column (6). A support pad (9) is fixedly installed at the top of the column cap (7). The top end of the pre-embedded screw (8) passes through the support pad (9) and extends to the top of the support pad (9). A T-shaped support plate (10) is provided at the top of the two support pads (9). The T-shaped support plate (10) is located between multiple transverse steel cages (3) and a lightweight hollow frame (5). A first connecting hole (11) is opened at both ends of the T-shaped support plate (10). The two pre-embedded screws (8) pass through the two first connecting holes (11) respectively. A fixing nut (12) is threadedly connected to the top of the pre-embedded screw (8). A support system is erected in the area between the support columns (6). A bottom template (30) and a floor slab side plate are installed on the top of the support system. The bottom template (30) and the column cap (7) are sealed. A sealing strip (31) is installed on the side of the column cap (7). The sealing strip (31) is provided with a movable part (311) at the bottom and a sealing part (312) at the top. The movable part (311) includes an annular thin plate integrally connected to the sealing strip (31). A wheel assembly (313) is vertically slidably installed inside the annular thin plate. The bottom template (30) is attached to the annular thin plate. The sealing part (312) includes an arc-shaped piece one (3121) and an arc-shaped piece two (3122) and a pre-compression body (3123) connected between the arc-shaped piece one (3121) and the arc-shaped piece two (3122). The middle height of the arc-shaped piece one (3121) is lower than the height at both ends, and the middle height of the arc-shaped piece two (3122) is greater than the height at both ends.

2. The large-span lightweight composite flat slab structure according to claim 1, characterized in that: The transverse steel cage (3) includes four transverse steel bars (13), and multiple first I-shaped blocks (14) are provided between the four transverse steel bars (13). First limiting rings (15) are fixed on both the top and bottom sides of the first I-shaped blocks (14). The four transverse steel bars (13) pass through the interior of the four first limiting rings (15) on the first I-shaped blocks (14).

3. The large-span lightweight composite flat slab structure according to claim 2, characterized in that: The longitudinal steel cage (4) includes four longitudinal steel bars (16), and multiple second I-shaped blocks (17) are provided between the four longitudinal steel bars (16). The top and bottom sides of the second I-shaped blocks (17) are fixed with second limiting rings (18), and the four longitudinal steel bars (16) pass through the interior of the four second limiting rings (18) on the second I-shaped blocks (17).

4. The large-span lightweight composite flat slab structure according to claim 3, characterized in that: Multiple transverse reinforcing bars (19) are provided between multiple transverse reinforcing cages (3), and the multiple transverse reinforcing bars (19) are spaced apart from the multiple transverse reinforcing cages (3). A second connecting hole (20) is provided on the second I-shaped block (17), and a third connecting hole (21) is provided on both sides of the lightweight hollow frame (5). The transverse reinforcing bars (19) pass through the interior of the multiple second connecting holes (20) and the third connecting holes (21).

5. A large-span lightweight composite flat slab structure according to claim 4, characterized in that: Multiple longitudinal limiting bars (22) are provided between multiple longitudinal steel cages (4), and the multiple longitudinal limiting bars (22) are distributed at intervals with the multiple longitudinal steel cages (4). The longitudinal limiting bars (22) are distributed perpendicularly to the transverse limiting bars (19). A fourth connecting hole (23) is provided on the first I-shaped block (14). A fifth connecting hole (24) is provided on both vertical sides of the lightweight hollow frame (5). The longitudinal limiting bars (22) pass through the interior of the multiple fourth connecting holes (23) and the fifth connecting holes (24). The longitudinal limiting bars (22) penetrate the T-shaped support plate (10).

6. A large-span lightweight composite flat slab structure according to claim 5, characterized in that: The top of the T-shaped support plate (10) is provided with a limiting plate (25), and the bottom of the limiting plate (25) is provided with multiple limiting grooves (26). The longitudinal limiting steel bars (22) at the top of the multiple longitudinal steel cages (4) pass through the interior of the multiple limiting grooves (26). The limiting plate (25) is provided with a sixth connecting hole (27) at both ends. The top of the pre-embedded screw (8) passes through the interior of the sixth connecting hole (27). The fixing nut (12) is provided at the top of the limiting plate (25).

7. A large-span lightweight composite flat slab structure according to claim 6, characterized in that: The bottom end of the limiting plate (25) is fixed with two positioning rods (28), and the top end of the T-shaped support plate (10) has two positioning grooves (29). The positioning grooves (29) are located inside the first connecting hole (11), and the positioning rods (28) are located inside the positioning grooves (29).

8. A large-span lightweight composite flat slab structure according to claim 7, characterized in that: The T-shaped support plate (10) is provided with longitudinal through holes for the longitudinal limiting steel bars (22) to pass through.

9. A construction method for a large-span lightweight composite flat slab, employing the large-span lightweight composite flat slab structure as described in claim 8, characterized in that... The construction steps are as follows: Step 1: Erection of templates and support system Install support pads (9) on the column cap (7) at the top of the support column (6) to ensure that the top of the pre-embedded screw (8) is exposed on the outside of the support pads (9); A support system is erected in the area between the support columns (6), and a bottom formwork and floor slab side plates are installed on the top of the support system. The bottom formwork and column caps (7) are sealed. Step 2, Assemble the steel mesh (2) T-shaped support plates (10) are inserted into the steel mesh (2). A lightweight hollow frame (5) is installed between the longitudinal steel cage (4) and the transverse steel cage (3) of the steel mesh (2). The lightweight hollow frame (5) is fixed by longitudinal limiting steel bars (22) and transverse limiting steel bars (19). The longitudinal limiting steel bars (22) are inserted into the longitudinal insertion hole to fix the lightweight hollow frame (5) between the longitudinal steel cage (4) and the transverse steel cage (3). A standard plate is installed between two adjacent first I-type blocks (14) and between two adjacent second I-type blocks (17). The two ends of the standard plate are provided with stepped grooves that fit against the side walls of the corresponding I-type blocks. The length of the standard plate is equal to the spacing between two adjacent unidirectional limiting steel bars. The stepped grooves are provided with through holes for inserting the corresponding limiting steel bars. By using longitudinal limiting steel bars (22) and transverse limiting steel bars (19) and standard plates, the first I-shaped block (14) and the second I-shaped block (17) are neatly distributed to ensure the strength of the large-span structure; Longitudinal reinforcement bars are inserted in the fourth connecting hole (23) on the first I-shaped block (14) of the transverse steel cage (3) near the edge, which are used to strengthen the structural strength of the edge position; Step 3, Install the steel mesh (2) The assembled steel mesh (2) is hoisted above the template by connecting the T-shaped support plate (10) with the trolley crane. The posture and position of the steel mesh (2) are adjusted and it is lowered vertically. The first connecting hole (11) and the pre-embedded screw (8) are inserted and matched. The trolley crane hook is detached from the T-shaped support plate (10), and the limiting plate (25) is installed on the top of the T-shaped support plate (10). Ensure that the positioning rod (28) and positioning groove (29) are properly installed, the sixth connecting hole (27) and the pre-embedded screw (8) are properly installed, and the longitudinal steel bar (16) is located in the limiting groove (26). Adjust the fixing nut (12) to fix the limiting plate (25). Step 4: Cast-in-place concrete Concrete is poured in place within the area enclosed by the bottom formwork and the side panels of the floor slab. After the concrete reaches the set strength, the formwork is removed to obtain a beamless lightweight composite floor slab.

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