Prefabricated large-span reinforced concrete floor capable of being assembled and adjusted

Abstract

The invention relates to the technical field of constructional engineering, in particular to a prefabricated large-span reinforced concrete floor capable of being assembled and adjusted. The floor slab comprises a prefabricated reinforced concrete slab with the length extending in the front-back direction, the front side and the rear side of the lower end face of the prefabricated reinforced concrete slab are each provided with a set of lap joint parts extending downwards, and a bottom support assembly fixed to the lower end face of the prefabricated reinforced concrete slab is arranged between the two lap joint parts; the bottom support assembly comprises a plurality of bottom support units which are arranged at intervals in the front-back direction, the bottom support units are symmetrically arranged in the front-back direction with the center of the prefabricated reinforced concrete slab as the center, the lower end of the bottom support unit in the middle is lower than the lower ends of the bottom support units on the two sides, and a prestress inhaul cable is connected between the two lap joint parts. And the lower end of each collet unit is supported and fixed on the prestressed inhaul cable. The bottom support assembly and the prestress inhaul cable are adopted to replace a lower flange and a web, the self weight is light, meanwhile, the lap joint part is arranged, the contact area of the floor and a building structure is increased, stress is reduced, assembling is convenient, and safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of construction engineering, and particularly relates to a prefabricated large-span reinforced concrete floor slab that can be assembled and adjusted. Background Art

[0002] At present, the prefabricated component system in the construction industry has entered a brand-new stage different from the past. Compared with cast-in-place concrete, precast concrete components have the advantages of reducing the usage of concrete and steel bars, reducing the number of workers on the construction site, shortening the construction period, and correspondingly reducing the total cost.

[0003] As Figure 1 shown, it is a precast reinforced concrete floor slab in the prior art. This kind of floor slab is mainly used in small-span (span less than 6 meters) operations of villas and residences. At the same time, the overall shape of the floor slab is cuboid, with a large thickness and self-weight, and it cannot be used in large-span (span above 9 meters) operations.

[0004] As Figure 2 shown, it is a double-T precast reinforced concrete floor slab in the prior art, including an upper flange 1 and two webs 2 arranged at intervals along the width direction of the upper flange. Although it can meet large-span operations, due to the uneven ends at both ends, when it is placed on room partitions or exterior walls, the sealing treatment between the placed end of the floor slab and the building is complex. At the same time, the self-weight of the floor slab is large, and the placed end is the end of the lower side of the web, and the area of the placed end is small, resulting in large stress at the contact between the floor slab and the building structure, and the safety factor is limited.

[0005] Therefore, designing a precast reinforced concrete floor slab that is easy to assemble, has high safety, and meets large spans is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a prefabricated large-span reinforced concrete floor slab that can be assembled and adjusted. The floor slab uses a bottom support component and prestressed cables to replace the lower flange and web, with a lighter self-weight. At the same time, a lapping part is provided to increase the contact area between the floor slab and the building structure, reduce stress, facilitate assembly, and improve safety.

[0007] In view of the above technical problems, the technical solution provided by the present invention is a prefabricated large-span reinforced concrete floor slab that can be assembled and adjusted, including a precast reinforced concrete slab with a length extending in the front-back direction. A set of downward-extending lapping portions are respectively arranged on the front and rear sides of the lower end surface of the precast reinforced concrete slab. A bottom support assembly fixed to the lower end surface of the precast reinforced concrete slab is arranged between the two lapping portions. The bottom support assembly includes a plurality of bottom support units arranged at intervals in the front-back direction. The plurality of bottom support units are symmetrically arranged along the front-back direction with the center of the precast reinforced concrete slab. The lower end of the middle bottom support unit is lower than the lower ends of the bottom support units on both sides. A prestressed cable is connected between the two lapping portions. The lower ends of each bottom support unit are supported and fixed on the prestressed cable.

[0008] Further, the bottom support unit is of an inverted conical structure.

[0009] Further, the bottom support unit includes a square mounting plate. Four support rods are respectively arranged at the four corners of the lower end of the square mounting plate. The lower ends of the support rods extend obliquely downward and converge to the vertical center line of the square mounting plate. The square mounting plate is fixedly mounted on the precast reinforced concrete slab.

[0010] Further, a plurality of internally threaded embedded parts are embedded at the positions corresponding to the square mounting plates on the lower end surface of the precast reinforced concrete slab. The square mounting plate is fixedly mounted by fastening bolts that are threadedly engaged with the internally threaded embedded parts.

[0011] Further, the upper ends of the internally threaded embedded parts protrude from the precast reinforced concrete slab.

[0012] Further, a top plate is arranged at the lower end of the bottom support unit. A groove extending in the front-back direction is arranged at the lower end of the top plate. The size of the groove is adapted to the size of the prestressed cable. The prestressed cable is slidably clamped in the groove. A bottom plate is fixed to the lower end of the top plate. The top plate and the bottom plate clamp and fix the prestressed cable.

[0013] Further, inner extension sections are arranged on the inner sides of the two lapping portions. The two ends of the prestressed cable are respectively anchored on the inner extension sections on the corresponding sides.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] (1) The precast reinforced concrete slab, the bottom support assembly and the prestressed cable are assembled to form a precast reinforced concrete floor slab. By adjusting the size of the bottom support assembly, the mid-span camber and bearing capacity can be adjusted to meet the large-span requirements. At the same time, without setting webs and lower flanges, the self-weight is lighter, the seismic load is reduced, the material consumption of the main structure and the foundation is reduced, and the overall cost is lowered.

[0016] The lower end of the base support unit in the middle is lower than that of the base support units on both sides. The shape of the prestressed cable is similar to an arc, and the external force is more reasonable.

[0017] Lap joints are respectively arranged on both sides of the lower end of the upper flange. The lap joints are used as the resting ends. The lower end surfaces of the lap joints are seated on the building structure, eliminating the need for an additional support system and shortening the construction period. At the same time, the lap joints are used to increase the contact area between the floor slab and the building structure, resulting in uniform stress and reduced stress. Also, during assembly, the lap joints are directly seated on the building structure, reducing the complexity of sealing between the resting ends and the building structure. On the basis of ensuring safety, the assembly difficulty is reduced. There can also be more anchoring points between the resting ends and the building structure, making the anchoring more secure and reliable. Description of the Drawings

[0018] Figure 1 is a small-span precast reinforced concrete floor slab in the prior art.

[0019] Figure 2 is a large-span, double-T precast reinforced concrete floor slab in the prior art.

[0020] Figure 3 is an isometric view from the first perspective of an adjustable precast large-span reinforced concrete floor slab according to Embodiment 1 of the present invention.

[0021] Figure 4 is an isometric view from the second perspective of an adjustable precast large-span reinforced concrete floor slab according to Embodiment 1 of the present invention.

[0022] Figure 5 is a front view of an adjustable precast large-span reinforced concrete floor slab according to Embodiment 1 of the present invention.

[0023] Figure 6 is a schematic structural view of the base support unit according to Embodiment 1 of the present invention.

[0024] Figure 7 is a schematic assembly view of the base support unit and the prestressed cable according to Embodiment 1 of the present invention.

[0025] Figure 8 is a partial cross-sectional view of the assembly of the base support unit and the prestressed cable according to Embodiment 1 of the present invention.

[0026] Figure 9 is a forward cross-sectional view of the top plate and the bottom plate according to Embodiment 1 of the present invention.

[0027] Figure 10 is a cross-sectional view of the top plate, the bottom plate and the prestressed cable according to Embodiment 1 of the present invention.

[0028] Figure 11It is a schematic structural diagram of the internal-thread embedded part in Embodiment 1 of the present invention.

[0029] Figure 12 It is a schematic assembly cross-sectional view of the precast large-span reinforced concrete floor slab and the internal-thread embedded part in Embodiment 1 of the present invention.

[0030] Figure 13 It is an isometric view from the first perspective of the assembly of the precast large-span reinforced concrete floor slab and the building structure in Embodiment 1 of the present invention.

[0031] Figure 14 It is an isometric view from the second perspective of the assembly of the precast large-span reinforced concrete floor slab and the building structure in Embodiment 1 of the present invention.

[0032] Figure 15 It is a large-span, T-shaped precast reinforced concrete floor slab in the prior art.

[0033] Figure 16 It is a large-span, I-shaped precast reinforced concrete floor slab in the prior art.

[0034] Figure 17 It is a mid-span cross-sectional dimension diagram of the T-shaped precast reinforced concrete floor slab in the prior art under the same design conditions.

[0035] Figure 18 It is a mid-span cross-sectional dimension diagram of the I-shaped precast reinforced concrete floor slab in the prior art under the same design conditions.

[0036] Figure 19 It is a bending moment design diagram of the I-shaped, T-shaped and precast reinforced concrete floor slab of the present invention.

[0037] In the figure: 1, upper flange; 2, web; 3, lower flange;

[0038] 4, precast reinforced concrete slab; 5, bottom support unit; 51, square mounting plate; 52, support rod; 53, mounting hole; 54, top plate; 55, groove; 56, bottom plate;

[0039] 6, prestressed cable; 7, internal-thread embedded part; 8, lapping part; 9, lapping surface; 10, inner extension section; 11, building structure. Detailed implementation manners

[0040] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application: Specific Embodiment 1:

[0042] In this embodiment, as Figure 3As shown, the length direction of the precast reinforced concrete slab 4 is the front-back direction.

[0043] Reference Figures 1 to 19 , a precast large-span reinforced concrete floor slab that can be assembled and adjusted (hereinafter referred to as the precast large-span reinforced concrete floor slab) of the present invention includes a precast reinforced concrete slab 4 whose length extends in the front-back direction. On the front and back sides of the lower end surface of the precast reinforced concrete slab 4, a set of downward-extending lapping parts 8 are respectively arranged. Specifically, the front and back end faces of the lapping part 8 are flush with the front and back end faces of the precast reinforced concrete slab 4. The lower end of the lapping part 8 is lower than the lower end of the precast reinforced concrete slab 4. The lower end surface of the lapping part 8 serves as a lapping surface 9 and is seated and fixed on the building structure 11.

[0044] In this embodiment, a bottom support assembly fixed to the lower end surface of the precast reinforced concrete slab 4 is arranged between the two lapping parts 8. Specifically, the bottom support assembly includes a plurality of bottom support units 5 arranged at intervals in the front-back direction. The plurality of bottom support units 5 are symmetrically arranged along the center of the precast reinforced concrete slab 4 in the front-back direction. And the lower end of the middle bottom support unit 5 is lower than the lower ends of the bottom support units 5 on both sides. A prestressed cable 6 is connected between the two lapping parts 8. The lower ends of each bottom support unit 5 are supported and fixed on the prestressed cable 6.

[0045] Specifically, in this embodiment, three bottom support units 5 are arranged at equal intervals in the front-back direction. Among them, the middle bottom support unit 5 is arranged at the center position of the lower end surface of the precast reinforced concrete slab 4, and the other two are symmetrically arranged on both sides of the middle bottom support unit 5. The prestressed cable 6 is made of a rigid and tensile material, such as prestressed steel strands, high-strength steel, alloy steel, high-strength fiber materials, etc. After tensioning, it is reliably anchored at both ends of the precast reinforced concrete slab 4.

[0046] Preferably, in this embodiment, the bottom support unit 5 is of an inverted conical structure and the bottom support unit 5 is made of steel. Specifically, the bottom support unit 5 includes a square mounting plate 51 at the top. Four support rods 52 are respectively arranged at the four corners of the lower end of the square mounting plate 51. The lower ends of each support rod 52 extend obliquely downward and converge to the vertical center line of the square mounting plate 51. The square mounting plate 51 is fixedly installed on the lower end surface of the precast reinforced concrete slab 4. The bottom support unit 51 is of an inverted conical structure and is integrally hollowed out, reducing weight and material consumption while ensuring structural strength. Of course, in other embodiments, when meeting the actual use requirements, it can also be a cuboid structure or a prism structure.

[0047] Preferably, in this embodiment, as Figure 6 , 11, as shown in Fig. 12, at the lower end face of the precast reinforced concrete slab 4 corresponding to the position of the square mounting plate 51, there is a pre-embedded internal thread embedded part 7. The internal thread embedded part 7 includes a bottom plate and a cylinder body arranged at the center of the bottom plate. An internally threaded through hole vertically penetrating is arranged at the center of the cylinder body and the bottom plate. A mounting hole 53 corresponding to the internal thread embedded part 7 is arranged on the square mounting plate 51. The square mounting plate 51 is fixedly mounted on the precast reinforced concrete slab 4 through a fastening bolt that passes through the mounting hole 53 and is screwed and fastened in the internal thread embedded part 7.

[0048] In this embodiment, preferably, the upper end of the internal thread embedded part 7 exposes the upper end of the precast reinforced concrete slab 4. With such a setting, the precast reinforced concrete slab 4 can be lifted by using the internal thread embedded part 7.

[0049] In this embodiment, preferably, as Figure 7 , 8 , as shown in Fig. 9, a top plate 54 is arranged at the lower end of the bottom support unit 5. Specifically, the top plate 54 is fixedly welded to the lower end of the bottom support unit 5. A groove 55 extending in the front-rear direction is opened at the lower end of the top plate 54, and the size of the groove 55 is adapted to the size of the prestressed cable 6. Specifically, in this embodiment, the cross-section of the groove 55 is square, and the inscribed circle of the square is adapted to the cross-sectional diameter of the prestressed cable 6. The prestressed cable 6 is slidably clamped in the groove 55.

[0050] A bottom plate 56 is fixedly threaded at the lower end of the top plate 54. Specifically, a countersunk through hole (not shown in the figure) is arranged on the bottom plate 56, a threaded hole is arranged at the corresponding position of the top plate 54, and a fixing bolt is also included. The lower end of the fixing bolt is sunk in the counterbore and the upper end is screwed into the threaded hole of the top plate 54. The top plate 54 and the bottom plate 56 are fixedly connected by using the fixing bolt. At the same time, during the fastening process, the prestressed cable 6 is clamped and fixed between the top plate 54 and the bottom plate 56 to prevent the prestressed cable 6 from sliding.

[0051] With such a setting, during installation, first, the prestressed cable 6 needs to be tensioned. At this time, the prestressed cable 6 is slidably clamped in the corresponding groove 55 for pre-positioning. When both ends of the prestressed cable 6 are anchored in the corresponding lapping parts 8 after the tensioning is completed, then the bottom plate 56 is installed to fix the prestressed cable 6, which is convenient for assembly and also convenient for subsequent adjustment of the tensioning degree.

[0052] In other embodiments, semicircular grooves 55 extending in the front-rear direction can be opened on the opposite surfaces of the top plate 54 and the bottom plate 56. The inner diameter of the semicircular grooves 55 is adapted to the diameter of the prestressed cable 6, and the prestressed cable 6 is clamped and fixed by the two semicircular grooves 55.

[0053] Preferably, in this embodiment, inwardly extending sections 10 extending towards each other are arranged on the opposite sides of the two lapping parts 8, and both ends of the prestressed cable 6 are respectively anchored on the corresponding inwardly extending sections 10 on the corresponding sides.

[0054] Assembly process of this application:

[0055] The prefabricated long-span reinforced concrete floor slab of this application is composed of a prefabricated reinforced concrete slab 4, a bottom support unit 5 and a prestressed cable 6. It can be assembled in the factory and transported to the construction site, or assembled at the construction site. During assembly, four adjustable supports are arranged at intervals along the transverse direction at the lower end of the prefabricated reinforced concrete slab 4, and the required pre-camber is achieved by increasing the top height of the two middle adjustable supports. Then install the bottom support unit 5, install the prestressed cable 6 and tension it to the preset stress value, and then anchor the prestressed cable 6. After that, install and fix the bottom plate 56 on the top plate 54 at the lower end of the bottom support unit 5, and clamp and fix the prestressed cable 6.

[0056] During actual use, as Figure 13 , 14 shown, the left and right dimensions of the overlapping part 8 are adapted to the width dimension of the reinforced concrete slab, and the overall end is flat. It can be directly seated on the building structure 11 without setting complex plugging treatment on the building structure 11. During installation, the floor slabs of the present invention are laid and anchored in sequence along the left and right directions, and the building operation can be completed. It is convenient for assembly, meets the long-span requirements, and the overlapping part 8 is evenly stressed, with high safety and reliability.

[0057] In summary, the prefabricated long-span reinforced concrete floor slab of the present invention can adjust the mid-span camber and bearing capacity by adjusting the size of the bottom support assembly, meets the long-span requirements, has a lighter self-weight, reduces the seismic load, reduces the material consumption of the main structure and foundation, reduces the overall cost, and has high safety. The lower end of the middle bottom support unit 5 is lower than the lower ends of the bottom support units 5 on both sides, and the shape of the prestressed cable 6 is similar to an arc, and the external force is more reasonable.

[0058] Overlapping parts 8 are respectively arranged on both sides at the lower end of the upper flange 1. Using the overlapping parts 8 as the supporting ends, the lower end surfaces of the overlapping parts 8 are seated on the building structure 11, without additional support systems, and the construction period is short. At the same time, using the overlapping parts 8 increases the contact area between the floor slab and the building structure 11, the stress is uniform, the stress is reduced, and the safety is improved. At the same time, during assembly, using the overlapping parts 8 to be directly seated on the building structure 11 reduces the complexity of dealing with the plugging between the supporting end and the building structure 11, and reduces the assembly difficulty on the basis of ensuring safety. There can also be more anchoring points between the supporting end and the building structure 11, and the anchoring is more secure and reliable.

[0059] In the prior art, in addition to double-T floor slabs, large-span floor slabs also include T-shaped floor slabs as Figure 15 shown, and I-shaped floor slabs as Figure 16 shown. Among them, for the T-shaped floor slab as Figure 15 shown, the bottom surfaces on both sides of its web 2 are used as overlapping surfaces 9, as Figure 16For the I-shaped floor slab shown, the lower ends on both sides of its lower flange 3 serve as lapping surfaces 9. The supporting ends of these two types of floor slabs are also relatively complex, with a high difficulty in plugging and sealing during installation. At the same time, they have a large self-weight, a small lapping surface 9, a large stress at the contact between the floor slab and the building structure 11, and limited safety.

[0060] The following are design examples of the floor slab structure of the present invention and the above T-shaped floor slab and I-shaped floor slab under the same design conditions, to illustrate that the present invention has a lighter self-weight on the basis of meeting the same design conditions.

[0061] The design conditions are as follows: the span of the floor slab is 11.60 m, the width of each floor slab is 1.20 m, the permanent load on the slab surface is 2.0 KN / m (excluding the self-weight of concrete), the live load on the slab surface is 4.0 KN / m, and the quasi-permanent coefficient of the live load is 0.5.

[0062] According to the "Code for Design of Concrete Structures" (GB50010-2010), the mid-span section is not less than 0.6 m, and uniformly take the mid-span section to be 0.6 m high (i.e., 600 mm). Considering the arrangement dimensions of the two rows of bottom steel bars, the bottom width of the I-shaped and T-shaped ones is not less than 240 mm.

[0063] Therefore, it can be obtained that to meet the above conditions, the mid-span section dimensions of the T-shaped floor slab are as Figure 17 shown, and the mid-span section dimensions of the I-shaped section are as Figure 18 shown. Figure 17 、 18 The dimension unit in

[0064] is millimeter (mm). The structure of the mid-span section of the floor slab of the present invention using reinforced concrete is the precast reinforced concrete slab 4 at the top. The mid-span section dimensions of the precast reinforced concrete slab 4 are the same as those of the upper flange 1 of the I-shaped and T-shaped ones, and will not be shown again.

[0065] According to the calculation of the material volume and density, it can be obtained that the self-weight of the floor slab of the present invention is 3.660 tons, the I-shaped section is 5.80 tons, and the T-shaped section is 7.105 tons. Therefore, the present invention has the lightest self-weight, the least amount of concrete used, and has more advantages in transportation, hoisting, foundation design and safety. Figure 19 At the same time, using the internationally common finite element calculation and analysis software MIDAS Gen, analyze the bending moments of the I-shaped section, T-shaped section and the floor slab of the present invention. The results are as

[0066] shown. It can be seen from the figure that the design value of the bending moment of the present invention is the smallest. And the external shape of the present invention is basically consistent with the bending moment design drawing, and the overall force is more scientific and reasonable.

[0067] Table 1 Comparison table of design parameters of the existing floor slabs and the floor slab of the present invention

[0068] Type Design value of bending moment (KN*m) <![CDATA[Concrete consumption (m 3 )]]> Weight (tons) 1 I-shaped cross-section precast floor slab 256.2 2.320 5.800 2 T-shaped cross-section precast floor slab 282.4 2.842 7.105 3 The precast floor slab of the present invention 6.4 (only the top slab) 1.464 3.660

[0069] Therefore, under the same design conditions, the present invention uses the least amount of materials, has the lightest weight, and at the same time has the smallest design value of bending moment. The ends of the present invention are flat, and it is convenient and fast to place on beams or walls, with uniform force, and there will be no situation of excessive local stress like the existing T-shaped or double-T-shaped structures. There can be more anchoring points between the slab and the main structure, making it safer and more reliable. Moreover, according to the "Code for Seismic Design of Buildings" (GB50011-2010), in the same seismic intensity area, the seismic load is proportional to the structural mass (self-weight). The present invention can reduce the seismic load, thereby reducing the amount of materials used for the main structure to resist the seismic load, ensuring safety and reducing costs.

[0070] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

[0071] In the description of the embodiments of the present application, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, terms such as "first", "second", etc. are only used for differential description and should not be construed as indicating or implying relative importance.

[0072] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined.

Claims

1. A prefabricated large-span reinforced concrete floor slab that can be assembled and adjusted, characterized in that, It includes a precast reinforced concrete slab with a length extending in the front-rear direction. A set of downward-extending lapping parts are respectively arranged on the front and rear sides of the lower end face of the precast reinforced concrete slab. A bottom support assembly fixed to the lower end face of the precast reinforced concrete slab is arranged between the two lapping parts. The bottom support assembly includes a plurality of bottom support units arranged at intervals in the front-rear direction. The plurality of bottom support units are symmetrically arranged along the center of the precast reinforced concrete slab in the front-rear direction. The lower end of the middle bottom support unit is lower than the lower ends of the bottom support units on both sides. A prestressed cable is connected between the two lapping parts, and the lower ends of each bottom support unit are supported and fixed on the prestressed cable.

2. The prefabricated large-span reinforced concrete floor slab capable of being assembled and adjusted according to claim 1, wherein The bottom support unit is of an inverted conical structure.

3. The prefabricated long-span reinforced concrete floor slab capable of being assembled and adjusted according to claim 2, wherein, The bottom support unit includes a square mounting plate. Four support rods are respectively arranged at the four corners of the lower end of the square mounting plate. The lower ends of the support rods extend obliquely downward and converge to the vertical center line of the square mounting plate. The square mounting plate is fixedly installed on the precast reinforced concrete slab.

4. The prefabricated long-span reinforced concrete floor slab capable of being assembled and adjusted according to claim 3, characterized in that, A plurality of internally threaded embedded parts are embedded at the position of the lower end face of the precast reinforced concrete slab corresponding to the square mounting plate. The square mounting plate is fixedly installed by fastening bolts that are threadedly engaged with the internally threaded embedded parts.

5. The prefabricated long-span reinforced concrete floor slab capable of being assembled and adjusted according to claim 4, wherein The upper end of the internally threaded embedded part protrudes from the precast reinforced concrete slab.

6. The prefabricated long-span reinforced concrete floor slab that can be assembled and adjusted according to claim 1, wherein A top plate is arranged at the lower end of the bottom support unit. A groove extending in the front-rear direction is arranged at the lower end of the top plate. The size of the groove is adapted to the size of the prestressed cable. The prestressed cable is slidably clamped in the groove. A bottom plate is fixed to the lower end of the top plate. The top plate and the bottom plate clamp and fix the prestressed cable.

7. The prefabricated long-span reinforced concrete floor slab that can be assembled and adjusted according to claim 1, wherein Inner extension sections are arranged on the inner sides of the two lapping parts. The two ends of the prestressed cable are respectively anchored on the inner extension sections on the corresponding sides.

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