Mortar leakage prevention structure for cast-in-place slab strip of prefabricated laminated slab

Abstract

The utility model relates to the technical field of prefabricated part splicing in building construction, and discloses a prefabricated laminated slab cast-in-place slab strip grout leakage prevention structure which comprises a laminated slab, a plurality of steel bars are fixedly connected to the front side and the rear side of the inner wall of the laminated slab at equal intervals, and a plurality of second sliding grooves are formed in the rear side of the top of the laminated slab. And the inner walls of the multiple second sliding grooves are slidably connected with extrusion plates, the inner walls of the extrusion plates are in threaded connection with threaded rods, the threaded rods are rotationally connected with the laminated plate, the tops of the threaded rods are fixedly connected with adjusting handles, and the left side and the right side of the front end of the top of the laminated plate are fixedly connected with fixing bases. According to the mortar leakage prevention device, the adjusting handle is rotated to drive the extrusion plate to move downwards to apply pressure, a pearl wool layer is gradually compacted into a gap between the laminated plates, the overturning rod is rotated to press the extrusion plate, the overturning rod is fixed through the fixing pin, it is guaranteed that the extrusion plate cannot shake, and the optimal mortar leakage prevention effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of prefabricated component splicing in building construction, in particular to a slurry leakage prevention structure of a cast-in-situ prefabricated composite slab. Background Art

[0002] Prefabricated composite slabs are assembled integral floor slabs made of prefabricated slabs and cast-in-place reinforced concrete layers. The composite slabs have good integrity, and the upper and lower surfaces of the slabs are flat, which facilitates the decoration of the finishing layer. They are suitable for high-rise buildings and large-span buildings with high requirements for overall rigidity. Prefabricated composite slabs do not require formwork during construction, which is highly efficient and effectively saves labor. At the same time, it also saves the consumption of building materials and reduces industrial waste. In terms of price, it is cheaper and more convenient than ordinary prefabricated slabs. At the same time, the composite slabs have the characteristics of fireproofing and insulation, waterproofing and moisture-proofing, anti-corrosion and anti-termite, and good weather resistance.

[0003] After searching, the Chinese patent announcement number is: CN219528104U, which discloses a prefabricated composite panel, which includes a composite panel body, a first embedded rod is embedded in the top surface of the composite panel body, and a fixing frame is fixed on the top surface of the first embedded rod, and a connecting frame is detachably provided on the top surface of the fixing frame. The first embedded rod is installed inside it, and the connecting frame is placed on the fixing frame, so that the shell can be inserted into the groove, and then the screw is rotated in the screw sleeve by rotating the swivel, and then the screw is rotated and connected to a rotating part, so that the rotating part slides down, so that the connecting rod can push the limit column to be inserted into the limit groove, and then the lifting ring can be fixed, so that the crane can transport the composite panel body to a high place of the building to complete the construction. After the transportation is completed, it is disassembled, so that the lifting ring can be disassembled, thereby avoiding the lifting ring from being too high during installation, affecting subsequent construction. There will be gaps between the composite panels during assembly and use, and there will be leakage during concrete pouring, affecting the quality of the project. Utility Model Content

[0004] In order to make up for the above shortcomings, the utility model provides a prefabricated composite slab cast-in-place slab with anti-leakage structure, which aims to improve the problem of leakage during concrete pouring due to gaps between the composite slabs, affecting the quality of the project.

[0005] The top of described sliding panel also is provided with an interlocking structure, and the interlocking structure of described sliding panel also is provided with an interlocking structure.

[0006] Through the above technical solution: by placing a pearl cotton layer in the gap between the two overlapping plates, the extrusion plate is driven downward by rotating the adjustment handle to apply pressure, and the pearl cotton layer is gradually compacted into the gap between the overlapping plates. The flip rod is rotated to press the extrusion plate, and the fixing pin is passed through the fixing hole to fix the flip rod, thereby ensuring that the extrusion plate will not shake, thereby achieving the best anti-leakage effect.

[0007] As a further description of the above technical solution:

[0008] The top of described sliding panel also is provided with an interlock plate, and the interlock plate is hinged on the base plate, is fixed with a backing pin on the interlock plate, and an end of sliding panel withstands on the backing pin of interlock plate.

[0009] Through the above technical solution: the position of the connecting rod on the moving block is adjusted by sliding the slider to make the sliding plate slide in the slide groove, the movement of the connecting rod is restricted by the hexagonal prism, and the two-way threaded rod is rotated to make the two moving blocks approach each other, thereby tightening the composite plate, and the sliding plate can be quickly extended and retracted by adjusting the position of the connecting rod, which is convenient for quick disassembly of the fixed structure.

[0010] As a further description of the above technical solution:

[0011] A plurality of tripods are fixedly connected to the top of the composite plate, and reinforcing ribs are fixedly connected to the outer walls of the plurality of tripods.

[0012] The above technical solution provides a stable tripod structure, which can enhance the structural strength of the top of the laminated plate to a certain extent. The reinforcement ribs are fixed to the outer wall of the tripod, further enhancing the tripod's structural strength. The reinforcement ribs can also increase the tripod's bending and shear resistance.

[0013] As a further description of the above technical solution:

[0014] A plurality of flow grooves are provided on the top of the outer wall of the laminated plate, and a plurality of conical blocks are fixedly connected to the top of the outer wall of the laminated plate.

[0015] Through the above technical solution: the multiple flow grooves opened on the top of the outer wall of the composite plate are mainly used to guide the flow of concrete slurry during the cast-in-place concrete construction process. The conical blocks can increase the roughness of the surface of the composite plate to a certain extent. When the concrete is poured on the composite plate, it can better combine with the concrete and improve the adhesion between the concrete and the composite plate.

[0016] As a further description of the above technical solution:

[0017] A second groove is provided on the front side of the outer wall of the laminated plate, and a protrusion is fixedly connected to the rear side of the outer wall of the laminated plate.

[0018] Through the above technical solution, the connection between the protrusion and the groove can squeeze the pearl cotton layer so that the pearl cotton layer and the laminated plate are tightly fitted.

[0019] As a further description of the above technical solution:

[0020] A sliding groove three is provided on the outer wall of the moving block, a slider is slidably connected to the inner wall of the sliding groove three, the slider is fixedly connected to the rotating ring, and the hexagonal prism passes through the slider.

[0021] Through the above technical solution: the bottom end of the connecting rod can be quickly moved up and down by sliding connection between the slider and the slide groove, ensuring that the position will not deviate during the movement.

[0022] As a further description of the above technical solution:

[0023] A connecting ring is slidably connected to the right side of the outer wall of the steel bar, and a bolt is threadedly connected to the outer wall of the connecting ring.

[0024] Through the above technical solution: the connecting ring can connect the steel bar with the external steel bar, and turning the bolt can make the connecting ring clamp the steel bar and the external steel bar.

[0025] As a further description of the above technical solution:

[0026] The rear side of the bottom of the stacking plate is rotatably connected with a plurality of rotating plates, and the bottom of the rotating plate is provided with a positioning groove.

[0027] Through the above technical solution: rotating the rotating plate so that both ends of the rotating plate are in contact with the composite plate, the two composite plates can be supported from below, and the positioning groove plays a positioning role for the top rod that needs to be set below.

[0028] The utility model has the following beneficial effects:

[0029] 1. In the utility model, a pearl cotton layer is placed in the gap between the two laminated plates, and the extrusion plate is driven downward by rotating the adjustment handle to apply pressure, so that the pearl cotton layer is gradually compacted into the gap between the laminated plates. The flip rod is rotated to press the extrusion plate, and the fixing pin is passed through the fixing hole to fix the flip rod, thereby ensuring that the extrusion plate does not shake, thereby achieving the best anti-leakage effect.

[0030] 2. In the utility model, the position of the connecting rod on the moving block is adjusted by sliding the slider to make the sliding plate slide in the sliding groove, the movement of the connecting rod is restricted by the hexagonal prism, and the two-way threaded rod is rotated to make the two moving blocks approach each other, thereby fastening the composite plate, and the sliding plate can be quickly extended and retracted by adjusting the position of the connecting rod, which is convenient for quick disassembly of the fixed structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a three-dimensional diagram of a prefabricated composite slab cast-in-situ slab with anti-leakage slurry structure proposed by the utility model;

[0032] Figure 2 This is a schematic top view of a prefabricated composite slab cast-in-situ slab with anti-leakage slurry structure proposed by the utility model;

[0033] Figure 3 This is an exploded schematic diagram of a partial structure of a prefabricated composite slab cast-in-situ plate with anti-leakage slurry structure proposed by the utility model;

[0034] Figure 4 This is a schematic diagram of a fixing mechanism for a prefabricated composite slab cast-in-situ with a slurry leakage prevention structure proposed by the present invention;

[0035] Figure 5 This is a schematic diagram of the partial structure of a prefabricated composite slab cast-in-situ slab with anti-leakage slurry structure proposed by the utility model.

[0036] Legend:

[0037] 1. Composite plate; 2. Fixing mechanism; 201. Moving block; 202. Sliding plate; 203. Connecting rod; 204. Reserved groove 1; 205. Hexagonal prism; 206. Reserved groove 2; 207. Bidirectional threaded rod; 208. Nut; 209. Turning handle; 210. Slide groove 1; 211. Rotating ring; 3. Steel bar; 4. Slide groove 2; 5. Extrusion plate; 6. Screw; 7. Adjusting handle; 8. Pearl cotton layer; 9. Fixed seat; 10. Flip rod; 11. Clamping seat; 12. Fixing pin; 13. Fixing hole; 14. Tripod; 15. Reinforcement rib; 16. Flow groove; 17. Conical block; 18. Groove 2; 19. Bump; 20. Slide groove 3; 21. Slider; 22. Connecting ring; 23. Bolt; 24. Rotating plate; 25. Positioning groove. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] Reference Figure 1 、 Figure 2 and Figure 3The cam 6 of the present invention is provided with a plurality of grooves 4 on the top and rear sides of the inner wall of the composite plate 1, and the plurality of grooves 4 are provided on the inner walls of the composite plate 1. The grooves 4 are provided on the inner walls of the plurality of grooves 4. The grooves 4 are slidably connected to the extrusion plates 5. The inner walls of the extrusion plates 5 are threadedly connected to the screw rods 6. The screw rods 6 are rotatably connected to the composite plate 1. Since the screw rods 6 are threadedly connected to the extrusion plates 5, and the screw rods 6 are rotatably connected to the composite plate 1, the rotation of the screw rods 6 will cause the extrusion plates 5 to move up and down on the screw rods 6. The top of the screw rods 6 is fixedly connected to the adjusting handle 7. The left and right sides of the top front end of the composite plate 1 are fixedly connected to the fixing seats 9. The adjacent sides of the two fixing seats 9 are fixedly connected to the turning rods 10. Rotating the turning rods 10 can make the turning rods 10 press the extrusion plates 5 tightly. A card seat 11 is provided on the rear side of the seat 9, and a fixing pin 12 is slidably connected to the inner wall of the card seat 11. Fixing holes 13 are provided on the left and right sides of the outer wall of the flip rod 10. The inner diameter of the fixing hole 13 is equal to the diameter of the fixing pin 12. A pearl cotton layer 8 is provided between two adjacent composite plates 1. The pearl cotton layer 8 plays the role of filling the gap and preventing leakage. A fixing mechanism 2 is provided around the bottom of the composite plate 1; the top of the composite plate 1 is fixedly connected to a plurality of tripods 14. The tripod 14 structure itself has good stability and can enhance the structural strength of the top of the composite plate 1 to a certain extent. The outer walls of the plurality of tripods 14 are fixedly connected to reinforcing ribs 15; the top of the outer wall of the composite plate 1 is provided with a plurality of flow grooves 16. The flow grooves 16 are mainly used to guide the flow of concrete slurry during the cast-in-place concrete construction process. The top of the outer wall of the composite plate 1 is fixedly connected to a plurality of conical blocks 17. The conical blocks 17 can increase the surface roughness of the composite plate 1 to a certain extent;

[0040] Specifically, the multiple steel bars 3 equidistantly fixedly connected to the front and rear sides of the inner wall of the composite plate 1 are mainly for enhancing the structural strength of the composite plate 1. The pearl cotton layer 8 is placed in the gap between the two adjacent composite plates 1. The pearl cotton layer 8 plays the role of filling the gap and preventing leakage. When the adjusting handle 7 is rotated, the screw 6 fixedly connected to the adjusting handle 7 also rotates accordingly. Since the screw 6 is threadedly connected to the extrusion plate 5, and the screw 6 is rotatably connected to the composite plate 1, the rotation of the screw 6 will cause the extrusion plate 5 to move up and down on the screw 6, exerting pressure on the pearl cotton layer 8, and gradually compacting the pearl cotton layer 8 into the gap between the composite plates 1. Rotating the flip rod 10 can make the flip rod 10 press the extrusion plate 5, and the fixing pin 12 The flip rod 10 can be fixed through the fixing hole 13 to ensure that the extrusion plate 5 does not shake; the tripod 14 structure itself has good stability, which can enhance the structural strength of the top of the composite plate 1 to a certain extent. The reinforcement ribs 15 are fixedly connected to the outer wall of the tripod 14, further enhancing the structural strength of the tripod 14. The reinforcement ribs 15 can increase the bending and shear resistance of the tripod 14; the flow groove 16 is mainly used to guide the flow of concrete slurry during the cast-in-place concrete construction process. The conical block 17 can increase the roughness of the surface of the composite plate 1 to a certain extent. When the concrete is poured on the composite plate 1, it can better combine with the concrete and improve the adhesion between the concrete and the composite plate 1.

[0041] Reference Figure 4 and Figure 5The fixing mechanism 2 includes a moving block 201, and multiple moving blocks 201 are respectively arranged around the bottom of the composite plate 1. The top of the moving block 201 is slidably connected to a sliding plate 202, and the sliding plate 202 can move horizontally at the bottom of the composite plate 1. A connecting rod 203 is provided on the outer side of the sliding plate 202. Both ends of the connecting rod 203 are rotatably connected to a rotating ring 211. The upper rotating ring 211 is fixedly connected to the sliding plate 202, and the lower rotating ring 211 is slidably connected to the moving block 201. The bottom end of the connecting rod 203 moves downward to drive the sliding plate 202 to move in the horizontal direction. A reserved groove 204 is provided at the bottom of the outer wall of the connecting rod 203, and a hexagonal prism 205 is slidably connected to the inner wall of the reserved groove 204. The upper and lower sides of the outer wall of the moving block 201 are provided with a reserved groove 206. The hexagonal prism 205 passes through the rotating ring 211 and is connected to the The reserved groove 206 is slidably connected, and the hexagonal prism 205 is inserted into the reserved groove 206 through the reserved groove 1 204, so that the sliding plate 202 is fixed. The inner walls of the two adjacent moving blocks 201 are threadedly connected with a two-way threaded rod 207. The threaded rod 207 is rotated to make the two moving blocks 201 approach each other. The front and rear sides of the two-way threaded rod 207 are threadedly connected with a nut 208. The middle part of the outer wall of the two-way threaded rod 207 is fixedly connected with a rotating handle 209. The bottom of the composite plate 1 is provided with a sliding groove 1 210 all around, and the sliding groove 1 210 is slidably connected to the sliding plate 202; the outer wall of the moving block 201 is provided with a sliding groove 3 20, and the inner wall of the sliding groove 3 20 is slidably connected with a slider 21, which is fixedly connected to the rotating ring 211. The hexagonal prism 205 passes through the slider 21, and the slider 21 and the sliding groove 3 20 facilitate the movement of the connecting rod 203;

[0042] Specifically, the sliding plate 202 can slide on the top of the moving block 201 and be slidably connected to the sliding groove 1 210 opened around the bottom of the composite plate 1, so that the sliding plate 202 can move laterally at the bottom of the composite plate 1, providing a basis for subsequent fixing operations. Moving the slider 21 downward can drive the connecting rod 203 to rotate, and the rotation of the connecting rod 203 drives the sliding plate 202 to move. When the two sliding plates 202 approach each other, the hexagonal prism 205 is inserted into the reserved groove 2 206 through the reserved groove 1 204, so that the sliding plate 202 is fixed, and then the threaded rod bidirectional threaded rod 207 is rotated to make the two moving blocks 201 approach each other, thereby fixing the composite plate 1, ensuring that the pearl cotton layer 8 is fitted with the composite plates 1 on both sides, and then the nut 208 is rotated so that the nut 208 is close to the moving block 201, thereby fixing the moving block 201.

[0043] Reference Figure 1 and Figure 3, a groove 2 18 is provided on the front side of the outer wall of the composite plate 1, and a protrusion 19 is fixedly connected to the rear side of the outer wall of the composite plate 1. The connection between the protrusion 19 and the groove 2 18 can squeeze the pearl cotton layer 8 so that the pearl cotton layer 8 is tightly fitted with the composite plate 1; a connecting ring 22 is slidably connected to the right side of the outer wall of the steel bar 3, and a bolt 23 is threadedly connected to the outer wall of the connecting ring 22. The connecting ring 22 can connect the steel bar 3 with the external steel bar;

[0044] Specifically, the groove 18 opened on the front side of the outer wall of the composite plate 1 and the protrusion 19 fixedly connected to the rear side of the outer wall are used for splicing between the composite plates 1. At the same time, the pearl cotton layer 8 can be squeezed so that the pearl cotton layer 8 fits tightly with the composite plate 1. The connecting ring 22 can connect the steel bar 3 with the external steel bar. Tightening the bolt 23 can make the connecting ring 22 clamp the steel bar 3 and the external steel bar.

[0045] Reference Figure 1 and Figure 5 , the rear side of the bottom of the composite plate 1 is rotatably connected to a plurality of rotating plates 24, and a positioning groove 25 is provided at the bottom of the rotating plate 24. The rotating plate 24 makes both ends of the rotating plate 24 fit with the composite plate 1, and can support the two composite plates 1 from below. The positioning groove 25 plays a positioning role for the top rod that needs to be set below;

[0046] Specifically, the rotating plate 24 is rotated so that both ends of the rotating plate 24 are in contact with the composite plate 1 , so that the two composite plates 1 can be supported from below. The positioning groove 25 serves as a positioning function for the top rod that needs to be provided below.

[0047] Working principle: Before using the device, first place the pearl cotton layer 8 in the gap between two adjacent laminated plates 1. The pearl cotton layer 8 fills the gap and prevents leakage. When the adjusting handle 7 is rotated, the screw 6 fixedly connected to the adjusting handle 7 also rotates. Since the screw 6 is threadedly connected to the extrusion plate 5, and the screw 6 is rotationally connected to the laminated plate 1, the rotation of the screw 6 will cause the extrusion plate 5 to move up and down on the screw 6, exerting pressure on the pearl cotton layer 8, and gradually compacting the pearl cotton layer 8 into the gap between the laminated plates 1. Rotating the flip rod 10 can make the flip rod 10 press the extrusion plate 5, and passing the fixing pin 12 through the fixing hole 13 can fix the flip rod 10, thereby ensuring that the extrusion plate 5 does not shake; and the sliding plate 202 can slide on the top of the moving block 201, and The sliding plate 202 is slidably connected to the sliding groove 1 210 opened around the bottom of the composite plate 1, so that the sliding plate 202 can move horizontally at the bottom of the composite plate 1, providing a basis for subsequent fixing operations. Moving the slider 21 downward can drive the connecting rod 203 to rotate, and the rotation of the connecting rod 203 drives the sliding plate 202 to move. When the two sliding plates 202 approach each other, the hexagonal prism 205 is inserted into the reserved groove 206 through the reserved groove 1 204, so that the sliding plate 202 is fixed, and then the threaded rod bidirectional threaded rod 207 is rotated to make the two moving blocks 201 approach each other, thereby fixing the composite plate 1, ensuring that the pearl cotton layer 8 is fitted with the composite plates 1 on both sides, and then the nut 208 is rotated so that the nut 208 is close to the moving block 201, fixing the moving block 201, thereby ensuring that the composite plate 1 is fixed more firmly.

[0048] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A prefabricated composite slab cast-in-situ slab with anti-leakage slurry structure, comprising a composite slab (1), characterized in that: The front and rear sides of the inner wall of the composite plate (1) are fixedly connected with a plurality of steel bars (3) at equal distances, the top rear side of the composite plate (1) is provided with a plurality of chute 2 (4), the inner walls of the plurality of chute 2 (4) are slidably connected with an extrusion plate (5), the inner wall of the extrusion plate (5) is threadedly connected with a screw (6), the screw (6) is rotatably connected to the composite plate (1), the top of the screw (6) is fixedly connected with an adjustment handle (7), and the left and right sides of the top front end of the composite plate (1) are fixedly connected with a fixing seat (9). A flip rod (10) is fixedly connected to the adjacent side of the two fixing seats (9), a clamping seat (11) is provided on the rear side of the fixing seat (9), and a fixing pin (12) is slidably connected to the inner wall of the clamping seat (11). Fixing holes (13) are provided on the left and right sides of the outer wall of the flip rod (10), and the inner diameter of the fixing hole (13) is equal to the diameter of the fixing pin (12). A pearl cotton layer (8) is provided between the two adjacent superimposed plates (1), and a fixing mechanism (2) is provided around the bottom of the superimposed plate (1).

2. The anti-slurry leakage structure of the cast-in-situ prefabricated composite slab according to claim 1, characterized in that: The fixing mechanism (2) includes a moving block (201), and a plurality of the moving blocks (201) are respectively arranged around the bottom of the composite plate (1). The top of the moving block (201) is slidably connected to a sliding plate (202), and a connecting rod (203) is arranged on the outside of the sliding plate (202). Both ends of the connecting rod (203) are rotatably connected to a rotating ring (211), the upper rotating ring (211) is fixedly connected to the sliding plate (202), and the lower rotating ring (211) is slidably connected to the moving block (201). A reserved groove (204) is provided at the bottom of the outer wall of the connecting rod (203), and the inner wall of the reserved groove (204) is A hexagonal prism (205) is slidably connected, and a reserved groove 2 (206) is provided on the upper and lower sides of the outer wall of the moving block (201). The hexagonal prism (205) passes through the rotating ring (211) and is slidably connected to the reserved groove 2 (206). The inner walls of two adjacent moving blocks (201) are threadedly connected with a bidirectional threaded rod (207), and the front and rear sides of the bidirectional threaded rod (207) are threadedly connected with a nut (208). The middle part of the outer wall of the bidirectional threaded rod (207) is fixedly connected with a rotating handle (209). The bottom of the composite plate (1) is provided with a sliding groove 1 (210) around, and the sliding groove 1 (210) is slidably connected to the sliding plate (202).

3. The anti-slurry leakage structure of the cast-in-situ prefabricated composite slab according to claim 1, characterized in that: A plurality of tripods (14) are fixedly connected to the top of the composite plate (1), and a plurality of reinforcing ribs (15) are fixedly connected to the outer walls of the tripods (14).

4. The anti-slurry leakage structure of the cast-in-situ prefabricated composite slab according to claim 1, characterized in that: A plurality of flow grooves (16) are provided on the top of the outer wall of the laminated plate (1), and a plurality of conical blocks (17) are fixedly connected to the top of the outer wall of the laminated plate (1).

5. The anti-slurry leakage structure of the cast-in-situ prefabricated composite slab according to claim 1, characterized in that: A second groove (18) is provided on the front side of the outer wall of the composite plate (1), and a protrusion (19) is fixedly connected to the rear side of the outer wall of the composite plate (1).

6. The anti-slurry leakage structure of the cast-in-situ prefabricated composite slab according to claim 2, characterized in that: The outer wall of the moving block (201) is provided with a sliding groove three (20), the inner wall of the sliding groove three (20) is slidably connected with a slider (21), the slider (21) is fixedly connected to the rotating ring (211), and the hexagonal prism (205) passes through the slider (21).

7. The anti-slurry leakage structure of the cast-in-situ prefabricated composite slab according to claim 1, characterized in that: A connecting ring (22) is slidably connected to the right side of the outer wall of the steel bar (3), and a bolt (23) is threadedly connected to the outer wall of the connecting ring (22).

8. The anti-slurry leakage structure of the cast-in-situ prefabricated composite slab according to claim 1, characterized in that: The rear side of the bottom of the composite plate (1) is rotatably connected to a plurality of rotating plates (24), and a positioning groove (25) is provided at the bottom of the rotating plate (24).

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