Fabricated concrete composite floor slab

Abstract

The utility model discloses an assembly type concrete composite floor slab which comprises a bearing prefabricated slab and a connecting prefabricated slab, a plurality of connecting assemblies are arranged on the side, close to the bearing prefabricated slab, of the connecting prefabricated slab, and the connecting assemblies are used for connecting and fixing the bearing prefabricated slab and the connecting prefabricated slab. Height adjusting assemblies are arranged at the two ends of the sides, close to each other, of the bearing prefabricated plate and the connecting prefabricated plate correspondingly, and the height adjusting assemblies are used for adjusting the height of the bearing prefabricated plate and the height of the connecting prefabricated plate and comprise bearing plates. The end, close to the bearing prefabricated plate and the connecting prefabricated plate, of the bearing plate can be clamped to the bearing prefabricated plate and the connecting prefabricated plate, and two supporting through grooves are formed in the top of the end, close to the bearing prefabricated plate and the connecting prefabricated plate, of the bearing plate. The height of a plurality of composite floor slabs can be adjusted under the condition that the rigidity and the bearing capacity of the composite floor slabs are not affected, and practicability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of laminated floor slabs, and particularly to a prefabricated concrete laminated floor slab. Background Art

[0002] During the construction process of building projects, prefabricated concrete laminated floor slabs are generally used to improve construction efficiency and project quality. Chinese Patent Publication No.: CN221461558U discloses a prefabricated laminated floor slab, which includes a concrete slab and an adjustment mechanism. A positioning auxiliary line is arranged on the upper surface of the concrete slab, threaded steel bars are arranged on the front and rear sides of the concrete slab, and structural steel bars are installed above the positioning auxiliary line. The utility model provides a prefabricated laminated floor slab. When installing the laminated slab, by twisting the nut, the hollow rotating shaft rotates in the steel pipe. When the hollow rotating shaft rotates, the threaded column inside the adjusting block can move up and down in the hollow rotating shaft, thereby driving the adjusting block to move up and down. By adjusting the adjusting mechanisms on the four sides of the concrete slab, the height of the laminated floor slab can be conveniently adjusted. The positioning holes and positioning columns correspond one by one, which is convenient for the laminated slabs to be fixed to each other and fit tightly. The positioning auxiliary line is convenient for construction workers to position and install the floor slab, so as to complete the function of adjusting the height and positioning of the laminated floor slab.

[0003] Although the above solution can adjust the height of the laminated floor slab, the design of arranging the adjustment mechanism at the four corners of the laminated floor slab seriously weakens the rigidity and bearing capacity of the laminated floor slab, which has a certain impact on the project quality. Moreover, it can only adjust the height of a single laminated floor slab. During the construction process, it will not only waste a lot of labor and time, but also easily cause different heights between multiple laminated floor slabs, thus affecting the project progress and quality. Summary of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide a prefabricated concrete laminated floor slab, aiming to solve the problems that the adjustment mechanism arranged in the laminated floor slab in the prior art seriously weakens the rigidity and bearing capacity of the laminated floor slab and can only adjust the height of a single laminated floor slab. During the construction process, it will not only waste a lot of labor and time, but also easily cause different heights between multiple laminated floor slabs, thus affecting the project progress and quality.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] An assembled concrete composite floor slab includes a bearing precast slab and a connecting precast slab. On one side of the connecting precast slab close to the bearing precast slab, a plurality of connecting components are provided. The connecting components are used to connect and fix the bearing precast slab and the connecting precast slab. At both ends of the mutually close sides of the bearing precast slab and the connecting precast slab, height adjusting components are provided. The height adjusting components are used to adjust the heights of the bearing precast slab and the connecting precast slab. The height adjusting components include a bearing plate. One end of the bearing plate close to the bearing precast slab and the connecting precast slab can be clamped on the bearing precast slab and the connecting precast slab. At the top of one end of the bearing plate close to the bearing precast slab and the connecting precast slab, two support through grooves are opened. At the positions corresponding to the support through grooves on the bearing precast slab and the connecting precast slab, sliding limit grooves are opened. At the positions corresponding to the sliding limit grooves at the bottom of the bearing plate, limit through grooves are opened. A connecting limit plate is slidably connected in the sliding limit groove. The connecting limit plate is used to limit the bearing plate.

[0007] Preferably, scales are marked on the peripheries of the bearing precast slab and the connecting precast slab.

[0008] Preferably, a plurality of perforated steel bars are fixedly penetrated inside the bearing precast slab and the connecting precast slab. At the top ends of the bearing precast slab and the connecting precast slab, slab surface steel bars are provided. On both sides of the slab surface steel bars, a plurality of symmetrically arranged distribution steel bars are fixedly connected. The bottom ends of the distribution steel bars are fixedly connected to the top ends of the bearing precast slab and the connecting precast slab.

[0009] Preferably, the connecting component includes a connecting block. The connecting block is fixedly connected to the outer wall of the connecting precast slab close to the bearing precast slab. Tilted blocks are symmetrically and fixedly connected to the upper and lower ends of the connecting block. The tilted blocks are fixedly connected to the connecting precast slab. First receiving grooves are symmetrically opened at the upper and lower ends of the connecting block. First clamping plates are slidably connected in the first receiving grooves. The first clamping plates are symmetrically arranged in the first receiving grooves at the upper and lower ends of the connecting block. First springs are fixedly connected between the first clamping plates and the inner walls of the first receiving grooves. At the positions corresponding to the connecting components on the side of the bearing precast slab close to the connecting precast slab, a plurality of connecting grooves are opened. The connecting grooves are adapted to the connecting components.

[0010] Preferably, first sliding adjustment grooves and second sliding adjustment grooves are respectively formed on both sides inside the receiving plate. Sliding rods are slidably connected in both the first sliding adjustment groove and the second sliding adjustment groove. A height adjustment plate is fixedly connected to the bottom end of the sliding rod. A second receiving groove adapted to the height adjustment plate is formed below between the first sliding adjustment groove and the second sliding adjustment groove. The second receiving groove is communicated with the first sliding adjustment groove and the second sliding adjustment groove. Rotation grooves are formed above the second receiving groove and between the first sliding adjustment groove and the second sliding adjustment groove. Both sides of the rotation groove are communicated with the first sliding adjustment groove and the second sliding adjustment groove. Connecting rods are fixedly connected in the rotation grooves. First gears are rotatably connected to the connecting rods. Rotating telescopic rods are rotatably connected to one side of the rotation groove away from the connecting rod. Second gears are fixedly connected to the rotating telescopic rods. The first gear meshes with the second gear. Rack bars are fixedly connected to the opposite sides of the sliding rods. The rack bars mesh with the first gear and the second gear.

[0011] Preferably, one end of the rotating telescopic rod away from the receiving precast slab and the connecting precast slab penetrates through the receiving plate and is fixedly connected with an adjusting nut. A locking assembly is arranged between the receiving plate and the rotating telescopic rod. The locking assembly includes a locking tooth sleeve fixedly connected to the receiving plate and a locking gear fixedly connected to the telescopic section of the rotating telescopic rod. The locking gear can mesh with the locking tooth sleeve.

[0012] Preferably, scales are marked on the edges of the sides of the sliding rods away from the receiving precast slab and the connecting precast slab and away from the rack bars.

[0013] Preferably, limiting sliding plates are fixedly connected to both sides of the receiving plate. Moving grooves for the perforated steel bars to slide are formed at the centers of the sides of the limiting sliding plates away from the receiving plate.

[0014] Preferably, third receiving grooves are formed on both sides of the limiting through groove. Second clamping plates are slidably connected in the third receiving grooves. The second clamping plates are symmetrically arranged in the limiting through groove. Second springs are fixedly connected between the second clamping plates and the inner walls of the third receiving grooves. Clamping grooves adapted to the second clamping plates are formed on both sides below the connecting limiting plate.

[0015] Compared with the prior art, the beneficial effects of the present utility model are:

[0016] In the present utility model, the receiving plate is snap-connected to the receiving precast slab, and the connecting and limiting plate is used to limit the receiving plate. Then, the connecting precast slab slides on the limiting sliding plate connected to the receiving plate, so that the connecting component on the connecting precast slab is snap-connected into the connecting groove. Then, the connecting and limiting plate is used to limit the receiving plate on the connecting precast slab. Next, the adjusting nut on the receiving plate is pulled, so that the rotating telescopic rod extends out, driving the locking gear to disengage from the locking tooth sleeve. Then, by rotating the adjusting nut, the heights of the receiving precast slab and the connecting precast slab can be adjusted. The scales on the sliding rod can ensure that the heights of the receiving precast slab and the connecting precast slab are consistent. In this way, the heights of multiple laminated floor slabs can be adjusted without affecting the rigidity and load-bearing capacity of the laminated floor slab, and the practicability is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional structural schematic diagram of an assembled concrete laminated floor slab;

[0018] Figure 2 is a cross-sectional structural schematic diagram of the connecting component;

[0019] Figure 3 is a cross-sectional structural schematic diagram of the receiving precast slab;

[0020] Figure 4 is a cross-sectional structural schematic diagram of the receiving plate and the limiting sliding plate;

[0021] Figure 5 is Figure 1 the enlarged structural schematic diagram at A in

[0022] Figure 6 is a three-dimensional structural schematic diagram of the connecting and limiting plate;

[0023] Figure 7 is a cross-sectional structural schematic diagram of the receiving plate.

[0024] In the figure: 1, receiving precast slab; 2, connecting precast slab; 3, perforated steel bar; 4, slab surface steel bar; 5, distribution steel bar; 6, connecting component; 61, connecting block; 62, inclined block; 63, first clamping plate; 64, first spring; 7, height adjusting component; 71, receiving plate; 72, rotating telescopic rod; 73, connecting rod; 74, first gear; 75, second gear; 76, sliding rod; 77, rack; 78, height adjusting plate; 8, connecting groove; 9, connecting and limiting plate; 10, clamping groove; 11, supporting through groove; 12, limiting through groove; 13, second clamping plate; 14, second spring; 15, limiting sliding plate; 16, locking component; 161, locking gear; 162, locking tooth sleeve; 17, adjusting nut. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0026] Embodiment:

[0027] Please refer to Figures 1 - 7 , this embodiment provides a precast concrete composite floor slab, which includes a bearing precast slab 1 and a connecting precast slab 2. A plurality of connecting components 6 are arranged on one side of the connecting precast slab 2 close to the bearing precast slab 1. The connecting components 6 are used to connect and fix the bearing precast slab 1 and the connecting precast slab 2. Height adjusting components 7 are arranged at both ends of the mutually close sides of the bearing precast slab 1 and the connecting precast slab 2. The height adjusting components 7 are used to adjust the heights of the bearing precast slab 1 and the connecting precast slab 2. The height adjusting component 7 includes a bearing plate 71. One end of the bearing plate 71 close to the bearing precast slab 1 and the connecting precast slab 2 can be clamped on the bearing precast slab 1 and the connecting precast slab 2. Two support through grooves 11 are opened at the top of one end of the bearing plate 71 close to the bearing precast slab 1 and the connecting precast slab 2. Sliding limit grooves are opened at the corresponding positions of the bearing precast slab 1 and the connecting precast slab 2 for the support through grooves 11. A limit through groove 12 is opened at the bottom of the bearing plate 71 corresponding to the sliding limit groove. A connecting limit plate 9 is slidably connected in the sliding limit groove. The connecting limit plate 9 is used to limit the bearing plate 71. When the bearing plate 71 is clamped on the bearing precast slab 1 and the connecting precast slab 2, the connecting limit plate 9 is passed through the sliding limit groove through the support through groove 11 and into the limit through groove 12 to limit the bearing plate 71 and prevent it from shifting.

[0028] In this embodiment, as Figure 1 shown, scales are marked on the peripheries of the bearing precast slab 1 and the connecting precast slab 2. When it is necessary to cut the bearing precast slab 1 or the connecting precast slab 2, the scales marked on the peripheries of the bearing precast slab 1 and the connecting precast slab 2 can make the cutting more accurate and convenient, and the practicability is good.

[0029] In this embodiment, as Figure 1 shown, a plurality of perforated steel bars 3 are fixedly inserted through the interiors of the bearing precast slab 1 and the connecting precast slab 2. A slab surface steel bar 4 is arranged at the top of the bearing precast slab 1 and the connecting precast slab 2. A plurality of symmetrically arranged distribution steel bars 5 are fixedly connected to both sides of the slab surface steel bar 4. The bottoms of the distribution steel bars 5 are fixedly connected to the tops of the bearing precast slab 1 and the connecting precast slab 2. The use of the perforated steel bars 3, the slab surface steel bar 4 and the distribution steel bars 5 can improve the tensile strength and flexural strength of the precast slab, and the practicability is strong.

[0030] In this embodiment, as Figure 1 , Figure 2 and Figure 3 shown, the connecting component 6 includes a connecting block 61, the connecting block 61 is fixedly connected to the outer wall of the connecting precast slab 2 close to the receiving precast slab 1, inclined blocks 62 are symmetrically and fixedly connected to the upper and lower ends of the connecting block 61, the inclined blocks 62 are fixedly connected to the connecting precast slab 2, first receiving grooves are symmetrically formed in the upper and lower ends of the connecting block 61, first clamping plates 63 are slidably connected in the first receiving grooves, the first clamping plates 63 are symmetrically arranged in the first receiving grooves at the upper and lower ends of the connecting block 61, first springs 64 are fixedly connected between the first clamping plates 63 and the inner walls of the first receiving grooves, a plurality of connecting grooves 8 are formed in the side of the receiving precast slab 1 close to the connecting precast slab 2 corresponding to the position of the connecting component 6, the connecting grooves 8 are adapted to the connecting component 6, by bringing the connecting precast slab 2 close to the receiving precast slab 1, the connecting block 61 enters the connecting grooves 8 on the receiving precast slab 1, the inner walls of the connecting grooves 8 squeeze the first clamping plates 63 so that the first clamping plates 63 enter the first receiving grooves and then are clamped in the connecting grooves 8, at this time the inclined blocks 62 are in close contact with the connecting grooves 8 so that the connection between the connecting precast slab 2 and the receiving precast slab 1 is closely fitted, thus completing the connection limit of the connecting precast slab 2 and the receiving precast slab 1, preventing the connecting precast slab 2 and the receiving precast slab 1 from shifting, in addition, the design of the close fit at the connection between the connecting precast slab 2 and the receiving precast slab 1 improves the tensile strength and bending strength of the precast slab, and has strong practicability.

[0031] In this embodiment, as Figure 4As shown in the figure, first sliding adjustment grooves and second sliding adjustment grooves are respectively formed on both sides inside the receiving plate 71. Slide bars 76 are slidably connected in both the first sliding adjustment groove and the second sliding adjustment groove. The bottom ends of the slide bars 76 are fixedly connected with height adjustment plates 78. A second receiving groove adapted to the height adjustment plate 78 is formed below between the first sliding adjustment groove and the second sliding adjustment groove. The second receiving groove communicates with the first sliding adjustment groove and the second sliding adjustment groove. Rotation grooves are formed above the second receiving groove and between the first sliding adjustment groove and the second sliding adjustment groove. Both sides of the rotation grooves communicate with the first sliding adjustment groove and the second sliding adjustment groove. Connecting rods 73 are fixedly connected in both rotation grooves. First gears 74 are rotatably connected to the connecting rods 73. Rotating telescopic rods 72 are rotatably connected to one side of the rotation grooves away from the connecting rods 73. Second gears 75 are fixedly connected to the rotating telescopic rods 72. The first gears 74 are meshed with the second gears 75. Rack bars 77 are fixedly connected to the opposite sides of the slide bars 76. The rack bars 77 are meshed with the first gears 74 and the second gears 75. By rotating the rotating telescopic rods 72 to drive the second gears 75 to rotate, the first gears 74 are driven to rotate accordingly, thereby driving the slide bars 76 in the first sliding adjustment groove and the second sliding adjustment groove to move simultaneously, so as to drive the height adjustment plate 78 to move up and down. In this way, the height of the connection between the precast slab 2 and the receiving precast slab 1 can be adjusted, saving labor and improving the construction efficiency at the same time.

[0032] In this embodiment, as Figure 1 and Figure 5 shown, the ends of the rotating telescopic rods 72 away from the receiving precast slab 1 and the connecting precast slab 2 penetrate through the receiving plate 71 and are fixedly connected with adjusting nuts 17. A locking assembly 16 is arranged between the receiving plate 71 and the rotating telescopic rods 72. The locking assembly 16 includes a locking tooth sleeve 162 fixedly connected to the receiving plate 71 and a locking gear 161 fixedly connected to the telescopic section of the rotating telescopic rod 72. The locking gear 161 can be meshed with the locking tooth sleeve 162. When adjusting the height, by pulling the adjusting nut 17, the rotating telescopic rod 72 is driven to extend, so that the locking gear 161 moves away from the locking tooth sleeve 162 to release the locking. Then, by rotating the adjusting nut 17, the height of the connection between the precast slab 2 and the receiving precast slab 1 can be adjusted. The application of the locking assembly 16 can limit the rotating telescopic rod 72, thereby limiting the height adjustment plate 78, so that the connection between the precast slab 2 and the receiving precast slab 1 can maintain the adjusted height, and the practical effect is good.

[0033] In this embodiment, as Figure 1 shown, scales are marked on the edges of the ends of the slide bars 76 away from the receiving precast slab 1 and the connecting precast slab 2 and away from the rack bars 77. Scales are marked on the slide bars 76. When adjusting the height, it can make the height adjustment more accurate and convenient, and improve the construction efficiency.

[0034] In this embodiment, as Figure 1 and Figure 4 shown, both sides of the receiving plate 71 are fixedly connected with limiting sliding plates 15. A moving groove for the perforated steel bar 3 to slide is provided at the center of the side of the limiting sliding plate 15 away from the receiving plate 71. Before adjusting the height of the connecting precast slab 2 and the receiving precast slab 1, first snap the receiving plate 71 onto the receiving precast slab 1, then insert the connecting limiting plate 9 to limit the receiving plate 71. Then move the connecting precast slab 2 between the limiting sliding plates 15 at both ends, and then move the connecting precast slab 2 so that the connecting component 6 on the connecting precast slab 2 is snapped into the connecting groove 8. In this way, the rapid connection between the connecting precast slab 2 and the receiving precast slab 1 is realized. The structure is simple and the practical effect is good.

[0035] In this embodiment, as Figure 1 and Figure 7 shown, third receiving grooves are provided on both sides of the limiting through groove 12. A second clamping plate 13 is slidably connected in each of the third receiving grooves. The second clamping plates 13 are symmetrically arranged in the limiting through groove 12. Second springs 14 are fixedly connected between the second clamping plates 13 and the inner walls of the third receiving grooves. Clamping grooves 10 adapted to the second clamping plates 13 are provided on both sides below the connecting limiting plate 9. When the bottom of the connecting limiting plate 9 is inserted into the limiting through groove 12, the bottom of the connecting limiting plate 9 squeezes the second clamping plates 13 so that the second clamping plates 13 move into the third receiving grooves. When the clamping grooves 10 on the connecting limiting plate 9 move to the position of the second clamping plates 13, the second clamping plates 13 extend into the clamping grooves 10 to complete the stable limitation of the receiving plate 71, so that the height adjusting plate 78 in the receiving plate 71 can stably adjust the height of the connecting precast slab 2 and the receiving precast slab 1. The structure is simple and the practicability is strong.

[0036] Working principle: Before adjusting the height of the connecting precast slab 2 and the receiving precast slab 1, first snap the receiving plate 71 onto the receiving precast slab 1. Then, pass the connecting limit plate 9 through the support through slot 11 and into the sliding limit slot and then into the limit through slot 12. The bottom of the connecting limit plate 9 squeezes the second clamping plate 13, causing the second clamping plate 13 to move into the third receiving groove. When the clamping groove 10 on the connecting limit plate 9 moves to the position of the second clamping plate 13, the second clamping plate 13 extends into the clamping groove 10. Then, move the connecting precast slab 2 between the limit sliding plates 15 at both ends. Then, move the connecting precast slab 2 so that the connecting block 61 on the connecting precast slab 2 enters the connecting groove 8 on the receiving precast slab 1. The inner wall of the connecting groove 8 squeezes the first clamping plate 63, causing the first clamping plate 63 to enter the first receiving groove and then be clamped in the connecting groove 8. At this time, the inclined block 62 is closely attached to the connecting groove 8, making the connection between the connecting precast slab 2 and the receiving precast slab 1 fit tightly. Then, pass the connecting limit plate 9 through the sliding limit slot on the connecting precast slab 2 and into the limit through slot 12 on the receiving plate 71 to stably limit the receiving plate 71. Then, pull the adjusting nut 17 to drive the rotating telescopic rod 72 to extend, thereby driving the locking gear 161 away from the locking tooth sleeve 162. Then, rotate the adjusting nut 17 to drive the rotating telescopic rod 72 to rotate, thereby driving the second gear 75 to rotate and then driving the first gear 74 to rotate. In this way, the sliding rods 76 in the first sliding adjustment groove and the second sliding adjustment groove move simultaneously, thereby driving the height adjustment plate 78 to move up and down. In this way, the height of the connecting precast slab 2 and the receiving precast slab 1 can be adjusted. The utility model realizes the adjustment of the height of multiple laminated floor slabs without affecting the rigidity and bearing capacity of the laminated floor slab, and has strong practicability.

[0037] The above embodiments are the preferred implementation schemes of the present utility model. In addition, the present utility model can also be implemented in other ways. Any obvious replacement without departing from the concept of the technical solution is within the protection scope of the present utility model.

Claims

1. An assembled concrete composite floor slab, comprising a precast slab (1) and a connecting precast slab (2), characterized in that: On one side of the connecting precast slab (2) close to the bearing precast slab (1), a plurality of connecting components (6) are provided. The connecting components (6) are used to connect and fix the bearing precast slab (1) and the connecting precast slab (2). At both ends of the mutually close sides of the bearing precast slab (1) and the connecting precast slab (2), height adjusting components (7) are provided. The height adjusting components (7) are used to adjust the heights of the bearing precast slab (1) and the connecting precast slab (2). The height adjusting component (7) includes a bearing plate (71). One end of the bearing plate (71) close to the bearing precast slab (1) and the connecting precast slab (2) can be clamped on the bearing precast slab (1) and the connecting precast slab (2). At the top of one end of the bearing plate (71) close to the bearing precast slab (1) and the connecting precast slab (2), two support through grooves (11) are opened. At the positions corresponding to the support through grooves (11) on the bearing precast slab (1) and the connecting precast slab (2), sliding limit grooves are opened. At the positions corresponding to the sliding limit grooves at the bottom of the bearing plate (71), limit through grooves (12) are opened. A connecting limit plate (9) is slidably connected in the sliding limit groove. The connecting limit plate (9) is used to limit the bearing plate (71).

2. The precast concrete composite floor slab according to claim 1, wherein: Scales are marked on the peripheries of the bearing precast slab (1) and the connecting precast slab (2).

3. The precast concrete composite floor slab according to claim 1, wherein: A plurality of perforated steel bars (3) are fixedly penetrated inside the bearing precast slab (1) and the connecting precast slab (2). At the top ends of the bearing precast slab (1) and the connecting precast slab (2), slab surface steel bars (4) are provided. On both sides of the slab surface steel bars (4), a plurality of symmetrically arranged distribution steel bars (5) are fixedly connected. The bottom ends of the distribution steel bars (5) are fixedly connected to the top ends of the bearing precast slab (1) and the connecting precast slab (2).

4. A prefabricated concrete composite floor slab according to claim 1, characterized in that: The connecting component (6) includes a connecting block (61). The connecting block (61) is fixedly connected to the outer wall of the connecting precast slab (2) close to the bearing precast slab (1). At the upper and lower ends of the connecting block (61), inclined blocks (62) are symmetrically and fixedly connected. The inclined blocks (62) are fixedly connected to the connecting precast slab (2). At the upper and lower ends of the connecting block (61), first accommodation grooves are symmetrically opened. First clamping plates (63) are slidably connected in the first accommodation grooves. The first clamping plates (63) are symmetrically arranged in the first accommodation grooves at the upper and lower ends of the connecting block (61). Between the first clamping plates (63) and the inner walls of the first accommodation grooves, first springs (64) are fixedly connected. At the positions corresponding to the connecting components (6) on the side of the bearing precast slab (1) close to the connecting precast slab (2), a plurality of connecting grooves (8) are opened. The connecting grooves (8) are adapted to the connecting components (6).

5. A prefabricated concrete composite floor slab according to claim 1, characterized in that: On both sides inside the receiving plate (71), a first sliding adjustment groove and a second sliding adjustment groove are respectively formed. A sliding rod (76) is slidably connected in both the first sliding adjustment groove and the second sliding adjustment groove. The bottom end of the sliding rod (76) is fixedly connected with a height adjustment plate (78). Below the first sliding adjustment groove and the second sliding adjustment groove, a second receiving groove adapted to the height adjustment plate (78) is formed. The second receiving groove is communicated with the first sliding adjustment groove and the second sliding adjustment groove. Above the second receiving groove and between the first sliding adjustment groove and the second sliding adjustment groove, a rotation groove is formed. Both sides of the rotation groove are communicated with the first sliding adjustment groove and the second sliding adjustment groove. A connecting rod (73) is fixedly connected in each rotation groove. A first gear (74) is rotatably connected to each connecting rod (73). A rotation telescopic rod (72) is rotatably connected to one side of each rotation groove away from the connecting rod (73). A second gear (75) is fixedly connected to each rotation telescopic rod (72). The first gear (74) is meshed with the second gear (75). A rack (77) is fixedly connected to the opposite sides of the sliding rods (76). The rack (77) is meshed with the first gear (74) and the second gear (75).

6. The precast concrete composite floor slab according to claim 5, wherein: One end of the rotation telescopic rod (72) away from the receiving precast slab (1) and the connecting precast slab (2) penetrates through the receiving plate (71) and is fixedly connected with an adjusting nut (17). A locking assembly (16) is arranged between the receiving plate (71) and the rotation telescopic rod (72). The locking assembly (16) includes a locking tooth sleeve (162) fixedly connected to the receiving plate (71) and a locking gear (161) fixedly connected to the telescopic section of the rotation telescopic rod (72). The locking gear (161) can be meshed with the locking tooth sleeve (162).

7. An assembled concrete composite floor slab according to claim 6, characterized in that: On the side edges of one end of the sliding rod (76) away from the receiving precast slab (1) and the connecting precast slab (2) and away from the rack (77), scales are marked.

8. The precast concrete composite floor slab according to claim 7, characterized in that: On both sides of the receiving plate (71), a limiting sliding plate (15) is fixedly connected. At the center of the side of the limiting sliding plate (15) away from the receiving plate (71), a moving groove for the perforated steel bar (3) to slide is formed.

9. A prefabricated concrete composite floor slab according to claim 1, characterized in that: On both sides of the limiting through groove (12), a third receiving groove is formed. A second clamping plate (13) is slidably connected in each third receiving groove. The second clamping plates (13) are symmetrically arranged in the limiting through groove (12). A second spring (14) is fixedly connected between each second clamping plate (13) and the inner wall of the third receiving groove. Clamping grooves (10) adapted to the second clamping plates (13) are formed on both sides below the connecting limiting plate (9).

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