Anti-floating combined core mold of hollow floor and construction method thereof

Abstract

The application discloses a kind of anti-floating combined core mould of hollow floor and its construction method, it is related to hollow floor technical field, including lower cover body, upper cover body, the middle part of the inner side wall of upper cover body is fixed with a pair of first clamping plate, the middle part of the inner side wall of lower cover body is equipped with a pair of bending connecting rod, and each pair of bending connecting rod is connected with a pair of first clamping plate by first clamping mechanism;The middle part of the top surface side edge of upper cover body is fixed with U-shaped plate, and the top end of U-shaped plate is inserted with linkage shaft, the middle part of the outer side wall of lower cover body is fixed with second clamping plate, and linkage shaft is connected with corresponding second clamping plate by second clamping mechanism;The middle part of the top surface of upper cover body is fixed with fixed disc, and the outer side of fixed disc is equipped with four L-shaped connecting rods, and the outer end between adjacent L-shaped connecting rods is equipped with limiting connecting plate.The application uses the cooperation of double clamping mechanisms, realizes the inside and outside synchronous locking of upper and lower formworks, further enhances the stability of upper and lower formworks, and greatly improves the construction efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hollow floor, in particular to a floating-resistant combined core mold for hollow floor and a construction method thereof. BACKGROUND

[0002] Cast-in-situ concrete hollow floor is a kind of hollow floor technology, which is formed by arranging light materials in a certain rule to replace part of the concrete of solid floor and forming cavities or light sandwich, so as to form cavities and hidden ribs and form a spatial honeycomb stress structure. A combined core mold for compression-resistant and floating-resistant hollow floor is disclosed in Chinese Utility Model (Publication No. CN206000065U), which is composed of an upper half mold and a lower half mold. The upper half mold is composed of a top plate, a side wall I and a support column I to form a semi-closed box body, and the lower half mold is composed of a bottom plate, a side wall II and a support column II to form a semi-closed box body. The upper half mold and the lower half mold are connected through the holes on the edge and the protrusions on the edge I. When connected, the cylinder I is inserted into the cylindrical groove in the cylinder II to form the combined core mold.

[0003] The current has the following disadvantages: 1. During the construction process of the concrete hollow floor, the upper and lower molds are prone to be not closed tightly, which may cause the concrete to be not dense, the core mold to float up, and the core mold to move sideways; 2. When the upper and lower molds are installed and locked, a bolt locking method is usually used, which may cause the bolt to rust after long-term use, and the bolt is not convenient to disassemble and replace. SUMMARY

[0004] The present application aims to solve the problem of the existing technology that the upper and lower molds are not closed tightly and may cause the core mold to be damaged.

[0005] In order to solve the problem of the existing technology that the upper and lower molds are not closed tightly and may cause the core mold to be damaged, the present application adopts the following technical solutions:

[0006] The application discloses an anti-floating combined core mold of a hollow floor, which comprises a lower cover body and an upper cover body, the lower cover body is a rectangular box with an open top surface, the upper cover body is a rectangular box with an open bottom surface, and the upper cover body and the lower cover body are arranged in a closed mode; a pair of symmetrically distributed first clamping plates are arranged in the middle of the four inner side walls of the upper cover body, a pair of rotationally connected first connecting shafts are arranged in the middle of the four inner side walls of the lower cover body, the outer end portions of each pair of the first connecting shafts are fixedly provided with symmetrically distributed bent connecting rods, each pair of the bent connecting rods is connected with a corresponding pair of the first clamping plates through a first clamping mechanism; U-shaped plates which are open upward and arranged in a circular mode are fixedly arranged in the middle of the four side edges of the top surface of the upper cover body, a rotationally penetrating linkage shaft is arranged at the top end portion of each U-shaped plate, second clamping plates are fixedly arranged in the middle of the four outer side walls of the lower cover body, and each linkage shaft is connected with a corresponding second clamping plate through a second clamping mechanism; a fixed disc is fixedly arranged in the middle of the top surface of the upper cover body, four fourth connecting shafts which are arranged in a circular mode are arranged on the outer side surface of the fixed disc, the bottom end portions of each fourth connecting shaft are rotationally connected with the top wall of the upper cover body, L-shaped connecting rods are fixedly arranged at the top end portions of each fourth connecting shaft, and the outer end portions of an adjacent pair of L-shaped connecting rods are provided with an elastically hinged limiting connecting plate.

[0007] The second clamping mechanism comprises limiting swing arms, a pair of symmetrically distributed limiting swing arms are fixedly arranged at the two end portions of the linkage shaft, a third connecting shaft which penetrates through the bottom end portions of the limiting swing arms is fixedly arranged, a second clamping block is fixedly arranged in the middle of the third connecting shaft, a second clamping groove is formed in the outer side surface of the second clamping plate, and the inner end portion of the second clamping block is clamped in the second clamping groove; an annular groove is formed in the middle of the outer ring surface of the fixed disc, a rotationally connected gear ring is clamped in the annular groove, a limiting gear which is concentrically fixed is arranged in the middle of each fourth connecting shaft, and the gear ring is sequentially meshingly connected with the four limiting gears; a T-shaped pin shaft is fixedly arranged at a corner of the top surface of the upper cover body, a cylinder bottom elastically hinged electric telescopic rod is arranged on the top end portion of the T-shaped pin shaft, a U-shaped ear seat is fixedly arranged at the telescopic rod end portion of the electric telescopic rod, an elastically hinged positioning ear seat is arranged in the opening of the U-shaped ear seat, and the outer end portion of the positioning ear seat is perpendicularly connected with the outer end portion of an adjacent limiting connecting plate; a linkage gear which is concentrically fixed is arranged in the middle of the linkage shaft, a T-shaped sliding groove is formed in the middle and lower portion of the U-shaped plate, a T-shaped rack which slides and penetrates through the T-shaped sliding groove is clamped, and the T-shaped rack is meshingly connected with the linkage gear; the inner end portion of the T-shaped rack extends to the position directly below the limiting connecting plate, an oval pin hole is formed in the middle of the limiting connecting plate, a limiting pin shaft is fixedly arranged at the inner end portion of the T-shaped rack, the top end portion of the limiting pin shaft is slidingly clamped in the oval pin hole, and the oval pin hole and the limiting pin shaft form a limiting action when the limiting connecting plate is dislocated and translated.

[0008] Preferably, the first clamping mechanism comprises a pair of L-shaped swing arms, the opposite outer sides of the pair of first clamping plates are provided with a pair of symmetrically distributed L-shaped swing arms, the opposite outer ends of the pair of L-shaped swing arms are movably hinged with the outer ends of the corresponding bent connecting rods, the opposite inner ends of the pair of L-shaped swing arms are fixedly provided with first clamping blocks, the opposite outer sides of the pair of first clamping plates are provided with first clamping grooves, the outer ends of each of the first clamping blocks are clamped in the corresponding first clamping groove; the opposite middle parts of the pair of L-shaped swing arms are provided with movably hinged hinge short rods, the opposite inner ends of the pair of hinge short rods are fixedly provided with second connecting shafts, the pair of second connecting shafts are located above the pair of first connecting shafts on the corresponding side, the inner ends of the pair of second connecting shafts are rotatably inserted into the middle part of the inner side wall of the lower cover body; the middle parts of the pair of first connecting shafts are sleeved with concentrically fixed driven gears, the opposite middle parts of the pair of first clamping plates are provided with vertically fixed first connecting plates, the bottom ends of the first connecting plates are fixedly provided with U-shaped racks with openings facing downward, the U-shaped racks extend between the pair of driven gears, and the U-shaped racks are in meshing connection with the pair of driven gears.

[0009] Preferably, the top surface of the second clamping plate is fixedly provided with an outwardly extending fixing lug, the outer end of the fixing lug is provided with a threaded hole, a second connecting plate is fixedly arranged between the middle and lower parts of the pair of limiting swing arms, the middle part of the second connecting plate is provided with a bolt hole, a bolt is inserted into the inside of the bolt hole, and the bottom end of the bolt is screw-inserted into the threaded hole.

[0010] The application further provides a construction method of the anti-floating combined core mold of the hollow floor system, which comprises the following steps:

[0011] Step one: in normal state, the lower cover body and the upper cover body are in an open state, when in use, the upper cover body is vertically covered on the lower cover body, with the slow falling of the upper cover body, the U-shaped rack is slowly lowered along the pair of driven gears, the U-shaped rack is meshed to drive the pair of driven gears to relatively rotate, thereby driving the pair of bent connecting rods to relatively fold, and through the hinging effect of the hinge short rod, the pair of L-shaped swing arms are relatively folded, so that the inner end of the first clamping block is clamped in the first clamping groove, thereby realizing the preliminary fixing of the upper cover body and the lower cover body;

[0012] Step two: the electric telescopic rod is started, and the extension rod of the electric telescopic rod is controlled to slowly extend, the positioning lug, the limiting connecting plate are hinged and translated through the U-shaped lug, thereby driving the L-shaped connecting rod, the fourth connecting shaft and the limiting gear to hinge and rotate, the limiting gear is meshed to drive the gear ring to rotate, the gear ring is meshed to drive the remaining limiting gears, the fourth connecting shafts and the L-shaped connecting rods to synchronously hinge and rotate, so that the four limiting connecting plates are synchronously and dislocatedly translated towards the fixing disc;

[0013] Step three, when the limiting connecting plate is misaligned and translated, the oval pin hole and the limiting pin shaft form a limiting effect, the T-shaped rack is driven by the limiting pin shaft to slide inwards along the T-shaped sliding groove, the T-shaped rack drives the linkage gear, linkage shaft and a pair of limiting swing arms to rotate, the pair of limiting swing arms drive the third connecting shaft and the second clamping block to swing downwards, and then drive the inner end of the second clamping block to be clamped in the second clamping groove;

[0014] Step four, a bolt is inserted into each bolt hole, and the bolt is tightened, the bolt is screwed and locked with the threaded hole, so that the second connecting plate is relatively fixed with the positioning lug, and the upper cover body and the lower cover body are fixed again.

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

[0016] 1. In the present application, the cooperation of the first clamping mechanism drives a pair of L-shaped swing arms to be relatively folded, so that the inner end of the second clamping block is clamped in the second clamping groove, and the upper cover body and the lower cover body are preliminarily fixed; the upper cover body and the lower cover body further reinforce the overall strength of the cover body, the upper cover body and the lower cover body are symmetrical in structure, which reduces the production cost of the product and is convenient for transportation;

[0017] 2. In the present application, the cooperation of the second clamping mechanism enables four limiting connecting plates to be misaligned and translated synchronously towards the fixed disc, a pair of limiting swing arms drive the third connecting shaft and the second clamping block to swing downwards, and then drive the inner end of the second clamping block to be clamped in the second clamping groove, so as to fix the upper cover body and the lower cover body again; the upper cover body and the lower cover body solve the problem of core mold anti-floating while avoiding damage to the building structure stress reinforcement, and also reduce the cost of core mold anti-floating measures;

[0018] In summary, the present application solves the problem of core mold damage caused by the poor closure of the upper and lower molds, and the overall structure is compact, the double clamping mechanisms are used together to realize the synchronous locking and fixing of the upper and lower molds, and the stability of the upper and lower molds is further enhanced, which greatly improves the construction efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present application, and form a part of the present application, the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 It is a front view of the structure of the present application;

[0021] Figure 2 It is an exploded view of the present application; Figure 1

[0022] Figure 3 It is a front view of the present application.​

[0023] Figure 4 For the present invention Figure 3 An explosion diagram;

[0024] Figure 5 This is a cross-sectional view of the right side of the structure of the present invention;

[0025] Figure 6 For the present invention Figure 5 An explosion diagram;

[0026] Figure 7 This is a schematic diagram showing the distribution of the L-shaped connecting rod and the limiting plate of the present invention;

[0027] Figure 8 This is a schematic diagram of the first engaging mechanism of the present invention;

[0028] Figure 9 This is a schematic diagram of the second engaging mechanism of the present invention;

[0029] The following components are listed in the diagram: 1. Lower cover; 11. First locking plate; 12. First locking block; 13. First connecting plate; 14. L-shaped swing arm; 15. Hinge short rod; 16. Bending connecting rod; 17. Driven gear; 18. U-shaped rack; 2. Upper cover; 21. Linkage gear; 22. T-shaped rack; 23. Bolt; 24. Fixing lug; 25. Second locking plate; 26. Limiting swing arm; 27. Second connecting plate; 28. Second locking block; 29. ​​U-shaped plate; 3. Fixing disc; 31. Gear ring; 32. L-shaped connecting rod; 33. Limiting connecting plate; 34. Limiting pin; 35. Positioning lug; 36. Limiting gear; 37. Electric telescopic rod. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0031] Example 1: This example provides an anti-buoyancy composite core mold for hollow floor slabs. See [link / reference]. Figures 1-9 Specifically, it includes a lower cover 1 and an upper cover 2. The lower cover 1 is a rectangular box with an open top surface, and the upper cover 2 is a rectangular box with an open bottom surface. The upper cover 2 and the lower cover 1 are arranged in a closed configuration.

[0032] The upper cover 2 has a pair of symmetrically distributed first clamping plates 11 fixed in the middle of the four inner side walls. The lower cover 1 has a pair of rotatably connected first connecting shafts inserted in the middle of the four inner side walls. The outer ends of each pair of first connecting shafts are fixed with symmetrically distributed bent connecting rods 16. Each pair of bent connecting rods 16 is connected to the corresponding pair of first clamping plates 11 through a first engaging mechanism.

[0033] The middle part of the top surface of the upper cover body 2 is fixedly provided with U-shaped plates 29 which are circularly arranged and upwardly open. The top end of each U-shaped plate 29 is rotatably inserted with a linkage shaft. The middle part of the four outer side walls of the lower cover body 1 is fixedly provided with second clamping plates 25. Each linkage shaft is connected with the corresponding second clamping plate 25 through a second clamping mechanism.

[0034] The middle part of the top surface of the upper cover body 2 is fixedly provided with a fixed disc 3. The outer side surface of the fixed disc 3 is provided with four fourth connecting shafts which are circularly arranged. The bottom end of each fourth connecting shaft is rotatably connected with the top wall of the upper cover body 2. The top end of each fourth connecting shaft is fixedly provided with an L-shaped connecting rod 32. The outer ends of an adjacent pair of L-shaped connecting rods 32 are movably hingedly provided with a limiting connecting plate 33.

[0035] In the specific implementation process, as shown in Figure 6 and Figure 8 , the first clamping mechanism includes L-shaped swing arms 14. The opposite outer sides of a pair of first clamping plates 11 are provided with a pair of symmetrically distributed L-shaped swing arms 14. The opposite outer ends of the pair of L-shaped swing arms 14 are movably hingedly connected with the outer ends of the corresponding bent connecting rods 16. The opposite inner ends of the pair of L-shaped swing arms 14 are fixedly provided with first clamping blocks 12. The opposite outer side surfaces of the pair of first clamping plates 11 are provided with first clamping grooves. The outer end of each first clamping block 12 is clamped in the corresponding first clamping groove.

[0036] The opposite middle parts of the pair of L-shaped swing arms 14 are movably hingedly provided with hinged short rods 15. The opposite inner ends of the pair of hinged short rods 15 are fixedly provided with second connecting shafts. The pair of second connecting shafts are located above the pair of first connecting shafts on the corresponding side. The inner ends of the pair of second connecting shafts are rotatably inserted in the middle part of the inner side wall of the lower cover body 1.

[0037] The pair of bent connecting rods 16 are relatively folded. Through the hinging action of the hinged short rods 15, the pair of L-shaped swing arms 14 are relatively folded, so that the inner end of the second clamping block 28 is clamped in the second clamping groove, thereby achieving the preliminary fixation of the upper cover body 2 and the lower cover body 1.

[0038] In the specific implementation process, as shown in Figure 6 and Figure 9 , the second clamping mechanism includes limiting swing arms 26. The two ends of the linkage shaft are fixedly provided with a pair of side-by-side symmetrically distributed limiting swing arms 26. The bottom ends of the pair of limiting swing arms 26 are fixedly provided with a third connecting shaft which penetrates through. The middle part of the third connecting shaft is fixedly provided with a second clamping block 28. The outer side surface of the second clamping plate 25 is provided with a second clamping groove. The inner end of the second clamping block 28 is clamped in the second clamping groove. The pair of limiting swing arms 26 drives the third connecting shaft and the second clamping block 28 to swing downward, thereby driving the inner end of the second clamping block 28 to be clamped in the second clamping groove, thereby achieving the re-fixation of the upper cover body 2 and the lower cover body 1.

[0039] It should be noted that: in this embodiment, the top surface of the second clamping plate 25 is fixedly provided with an outwardly extending fixing lug 24, a threaded hole is formed in the outer end of the fixing lug 24, a second connecting plate 27 is fixedly arranged between the middle and lower parts of a pair of limiting swing arms 26, a bolt hole is formed in the middle part of the second connecting plate 27, a bolt 23 is inserted into the bolt hole, and the bottom end of the bolt 23 is screwed into the threaded hole; a bolt 23 is inserted into each bolt hole, and the bolt 23 is tightened, so that the second connecting plate 27 is fixed relative to the positioning lug 35.

[0040] Embodiment two: in embodiment one, there is also a pair of folding connecting rods 16 that cannot be relatively folded, therefore, based on embodiment one, this embodiment further comprises:

[0041] In the specific implementation process, as shown in Figure 6 and Figure 8 , the middle part of a pair of first connecting shafts is sleeved with a concentric driven gear 17, the middle part of a pair of first clamping plates 11 is provided with a vertically fixed first connecting plate 13, the bottom end of the first connecting plate 13 is fixedly provided with a U-shaped rack 18 with an opening facing downward, the U-shaped rack 18 extends to between a pair of driven gears 17, and the U-shaped rack 18 is meshed and connected with a pair of driven gears 17; with the slow falling of the upper cover body 2, the U-shaped rack 18 is slowly lowered along a pair of driven gears 17, the U-shaped rack 18 is meshed to drive a pair of driven gears 17 to relatively rotate, thereby driving a pair of folding connecting rods 16 to relatively fold.

[0042] Embodiment three: in embodiment two, there is also a problem that the four limiting connecting plates 33 cannot be synchronously and mispositioned translated, therefore, based on embodiment two, this embodiment further comprises:

[0043] In the specific implementation process, as shown in Figure 6 and Figure 7 , the outer ring surface of the fixed disc 3 is provided with an annular groove in the middle part, the annular groove is engaged with a rotatingly connected gear ring 31, the middle part of each fourth connecting shaft is sleeved with a concentrically fixed limiting gear 36, and the gear ring 31 is sequentially meshed and connected with the four limiting gears 36; the gear ring 31 is further meshed to drive the remaining limiting gears 36, fourth connecting shafts and L-shaped connecting rods 32 to synchronously and hingedly rotate, so that the four limiting connecting plates 33 are synchronously mispositioned translated towards the fixed disc 3;

[0044] The top corner of the upper cover body 2 is fixedly provided with a T-shaped pin shaft, the top end of the T-shaped pin shaft is sleeved with a cylinder body bottom movable hinge electric telescopic rod 37, the telescopic rod end of the electric telescopic rod 37 is fixedly provided with a U-shaped ear seat, the opening of the U-shaped ear seat is provided with a movable hinge positioning ear seat 35, the outer end of the positioning ear seat 35 is vertically connected with the outer end of an adjacent limiting connecting plate 33; the telescopic rod of the control electric telescopic rod 37 is slowly lengthened, the positioning ear seat 35 and the limiting connecting plate 33 are driven to hinge and translate through the U-shaped ear seat, and then the L-shaped connecting rod 32, the fourth connecting shaft and the limiting gear 36 are driven to hinge and rotate, the limiting gear 36 is engaged to drive the gear ring 31 to rotate,

[0045] Embodiment four: in embodiment three, there is also a pair of limiting swing arms 26 that cannot rotate, therefore, on the basis of embodiment three, this embodiment further comprises:

[0046] In the specific implementation process, as shown in Figure 6 and Figure 7 The middle part of the linkage shaft is sleeved with a concentric fixed linkage gear 21, the middle and lower part of the U-shaped plate 29 is provided with a T-shaped sliding groove, the inside of the T-shaped sliding groove is clamped with a slidingly penetrating T-shaped rack 22, and the T-shaped rack 22 is in meshing connection with the linkage gear 21;

[0047] The inner end of the T-shaped rack 22 extends to the front of the limiting connecting plate 33, the middle part of the limiting connecting plate 33 is provided with an oval pin hole, the inner end of the T-shaped rack 22 is fixedly provided with a limiting pin shaft 34, and the top end of the limiting pin shaft 34 is slidingly clamped in the oval pin hole; when the limiting connecting plate 33 is misaligned and translated, the oval pin hole and the limiting pin shaft 34 form a limiting action, the T-shaped rack 22 is driven to slide inward along the T-shaped sliding groove through the limiting pin shaft 34, and the T-shaped rack 22 is engaged to drive the linkage gear 21, the linkage shaft and the pair of limiting swing arms 26 to rotate.

[0048] Embodiment five: specifically, the working principle and operation method of the present application are as follows:

[0049] Step one, in normal state, the lower cover body 1 and the upper cover body 2 are in an open state, in use, the upper cover body 2 is vertically covered on the lower cover body 1, with the slow falling of the upper cover body 2, the U-shaped rack 18 is driven to slowly descend along the pair of driven gears 17, the U-shaped rack 18 is engaged to drive the pair of driven gears 17 to relatively rotate, thereby driving the pair of bent connecting rods 16 to relatively close, and then driving the pair of L-shaped swing arms 14 to relatively close through the hinge action of the hinge short rod 15, so that the inner end of the first clamping block 12 is clamped in the first clamping groove, thereby realizing the preliminary fixing of the upper cover body 2 and the lower cover body 1;

[0050] Step two, start the electric telescopic rod 37, and control the slow extension of the telescopic rod of the electric telescopic rod 37, drive the positioning ear seat 35, the limiting connecting plate 33 to be hinged and translated, and then drive the L-shaped connecting rod 32, the fourth connecting shaft and the limiting gear 36 to be hinged and rotated, the limiting gear 36 engages to drive the gear ring 31 to rotate, the gear ring 31 engages to drive the remaining limiting gears 36, the fourth connecting shaft and the L-shaped connecting rod 32 to be hinged and rotated synchronously, so that the four limiting connecting plates 33 are translated synchronously and are out of position towards the fixed disc 3;

[0051] Step three, when the limiting connecting plate 33 is out of position and translated, the oval pin hole and the limiting pin shaft 34 form a limiting action, the T-shaped rack 22 is driven by the limiting pin shaft 34 to slide inward along the T-shaped sliding groove, the T-shaped rack 22 engages to drive the linkage gear 21, the linkage shaft and the pair of limiting swing arms 26 to rotate, so that the pair of limiting swing arms 26 drive the third connecting shaft and the second clamping block 28 to swing downward, and then drive the inner end of the second clamping block 28 to be clamped in the second clamping groove.

[0052] Step four, a bolt 23 is inserted into each bolt hole, and the bolt 23 is tightened, the bolt 23 is screwed and locked with the threaded hole, so that the second connecting plate 27 is relatively fixed with the positioning ear seat 35, and the upper cover body 2 and the lower cover body 1 are fixed again.

[0053] The application solves the problem that the upper and lower mold plates are not closed firmly and are easy to damage the core mold, and the overall structure is compact, the double clamping mechanisms are used together to realize the internal and external synchronous locking and fixing of the upper and lower mold plates, and the stability of the upper and lower mold plates is further enhanced, and the construction efficiency is greatly improved.

[0054] The above is only a preferred specific embodiment of the application, but the protection scope of the application is not limited thereto, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the application within the technical range disclosed by the application, which should be covered in the protection scope of the application.

Claims

1. A kind of anti-floating combined core mould of hollow floor, including lower cover body (1), upper cover body (2), it is characterized in that: The lower cover body (1) is a rectangular box with an open top, the upper cover body (2) is a rectangular box with an open bottom, the upper cover body (2) and the lower cover body (1) are arranged in a closed manner one above the other, a pair of symmetrically distributed first clamping plates (11) are fixed to the middle portions of the four inner side walls of the upper cover body (2), a pair of rotatably connected first connecting shafts are inserted into the middle portions of the four inner side walls of the lower cover body (1), the outer end portions of each pair of first connecting shafts are fixed with symmetrically distributed bent connecting rods (16), each pair of bent connecting rods (16) is connected with a corresponding pair of first clamping plates (11) through a first clamping mechanism, U-shaped plates (29) that are open upward and arranged in a circular manner are fixed to the middle portions of the four side edges of the top surface of the upper cover body (2), a rotating penetrating linkage shaft is inserted into the top end portion of each U-shaped plate (29), second clamping plates (25) are fixed to the middle portions of the four outer side walls of the lower cover body (1), each linkage shaft is connected with a corresponding second clamping plate (25) through a second clamping mechanism, a fixed disc (3) is fixed to the middle portion of the top surface of the upper cover body (2), four fourth connecting shafts arranged in a circular manner are arranged on the outer side surface of the fixed disc (3), the bottom end portions of each fourth connecting shaft are rotatably connected with the top wall of the upper cover body (2), L-shaped connecting rods (32) are fixed to the top end portions of each fourth connecting shaft, a movable hingedly connected limiting connecting plate (33) is arranged between the outer end portions of an adjacent pair of L-shaped connecting rods (32). The second clamping mechanism comprises a limiting swing arm (26), a pair of limiting swing arms (26) are symmetrically arranged side by side and fixed at both ends of the linkage shaft, a third connecting shaft is fixed and penetrated between the bottom ends of the pair of limiting swing arms (26), a second clamping block (28) is fixed at the middle part of the third connecting shaft, a second clamping groove is formed in the outer side surface of the second clamping plate (25), and the inner end of the second clamping block (28) is clamped in the second clamping groove; an annular groove is formed in the middle part of the outer ring surface of the fixed disc (3), a rotatingly connected gear ring (31) is clamped in the annular groove, a limiting gear (36) is concentrically and fixedly connected at the middle part of each fourth connecting shaft, and the gear ring (31) is sequentially and meshingly connected with the four limiting gears (36); a T-shaped pin shaft is fixed at a corner of the top surface of the upper cover body (2), a cylinder bottom movably hinged electric telescopic rod (37) is sleeved at the top end of the T-shaped pin shaft, a U-shaped ear seat is fixed at the telescopic rod end of the electric telescopic rod (37), a movably hinged positioning ear seat (35) is arranged in the opening of the U-shaped ear seat, and the outer end of the positioning ear seat (35) is perpendicularly connected with the outer end of an adjacent limiting connecting plate (33); a linkage gear (21) is concentrically and fixedly connected at the middle part of the linkage shaft, a T-shaped sliding groove is formed in the middle and lower part of the U-shaped plate (29), a slidingly penetrated T-shaped rack (22) is clamped in the T-shaped sliding groove, and the T-shaped rack (22) is meshingly connected with the linkage gear (21); the inner end of the T-shaped rack (22) extends to the position directly below the limiting connecting plate (33), an oval pin hole is formed in the middle part of the limiting connecting plate (33), a limiting pin shaft (34) is fixed at the inner end of the T-shaped rack (22), the top end of the limiting pin shaft (34) is slidingly clamped in the oval pin hole, and when the limiting connecting plate (33) is shifted, the oval pin hole and the limiting pin shaft (34) form a limiting action.

2. The anti-floating composite core form of a hollow floor according to claim 1, wherein: The first clamping mechanism comprises L-shaped swing arms (14), a pair of symmetrical L-shaped swing arms (14) are arranged on the opposite outer sides of the pair of first clamping plates (11), the opposite outer ends of the pair of L-shaped swing arms (14) are movably hinged to the outer ends of the corresponding bent connecting rods (16), the opposite inner ends of the pair of L-shaped swing arms (14) are fixedly provided with first clamping blocks (12), the opposite outer sides of the pair of first clamping plates (11) are provided with first clamping grooves, and the outer ends of each of the first clamping blocks (12) are clamped in the corresponding first clamping groove; the opposite middle portions of the pair of L-shaped swing arms (14) are provided with movably hinged hinge short rods (15), the opposite inner ends of the pair of hinge short rods (15) are fixedly provided with second connecting shafts, the pair of second connecting shafts are located above the pair of first connecting shafts on the corresponding side, and the inner ends of the pair of second connecting shafts are rotatably inserted into the middle portion of the inner side wall of the lower cover body (1); the middle portions of the pair of first connecting shafts are sleeved with concentrically fixed driven gears (17), the opposite middle portions of the pair of first clamping plates (11) are provided with vertically fixed first connecting plates (13), the bottom end of the first connecting plate (13) is fixedly provided with a U-shaped rack (18) with an opening facing downward, the U-shaped rack (18) extends between the pair of driven gears (17), and the U-shaped rack (18) is in meshing connection with the pair of driven gears (17).

3. The anti-floating composite core form of a hollow floor according to claim 2, wherein: The top surface of the second clamping plate (25) is fixedly provided with an outwardly extending fixed lug (24), the outer end of the fixed lug (24) is provided with a threaded hole, the middle and lower portions of the pair of limiting swing arms (26) are fixedly provided with a second connecting plate (27), the middle portion of the second connecting plate (27) is provided with a bolt hole, a bolt (23) is inserted into the bolt hole, and the bottom end of the bolt (23) is screwingly inserted into the threaded hole.

4. The construction method of the anti-floating combined core form of a hollow floor according to claim 3, characterized in that, The method comprises the following steps: Step one, in normal state, the lower cover body (1) and the upper cover body (2) are in an open state, in use, the upper cover body (2) is vertically covered on the lower cover body (1), with the slow falling of the upper cover body (2), the U-shaped rack (18) is slowly lowered along the pair of driven gears (17), the U-shaped rack (18) is in meshing connection to drive the pair of driven gears (17) to relatively rotate, thereby driving the pair of bent connecting rods (16) to relatively close, and through the hinging action of the hinge short rod (15), the pair of L-shaped swing arms (14) are relatively closed, so that the inner end of the first clamping block (12) is clamped in the first clamping groove, thereby realizing the preliminary fixing of the upper cover body (2) and the lower cover body (1); Step two, start the electric telescopic rod (37), and control the slow extension of the electric telescopic rod (37), drive the positioning ear seat (35), limit the web (33) to hinged translation, and then drive the L-shaped connecting rod (32), the fourth connecting shaft and the limit gear (36) to hinged rotation, the limit gear (36) engages to drive the gear ring (31) to rotate, the gear ring (31) engages to drive the remaining limit gear (36), the fourth connecting shaft and the L-shaped connecting rod (32) to synchronously hinged rotation, so that the four limit webs (33) are synchronously misaligned and translated towards the fixed disc (3); Step three, when the limit web (33) is misaligned and translated, the oval pin hole and the limit pin shaft (34) form a limiting action, the T-shaped rack (22) is driven by the limit pin shaft (34) to slide inwards along the T-shaped sliding groove, the T-shaped rack (22) engages to drive the linkage gear (21), the linkage shaft and a pair of limit swing arms (26) to rotate, so that the pair of limit swing arms (26) drive the third connecting shaft and the second clamping block (28) to swing downwards, and then drive the inner end of the second clamping block (28) to be clamped in the second clamping groove; Step four, insert a bolt (23) in each bolt hole, and tighten the bolt (23), the bolt (23) and the threaded hole are threadedly locked, so that the second web (27) and the positioning ear seat (35) are relatively fixed, and the upper cover body (2) and the lower cover body (1) are fixed again.

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