Prefabricated assembly type composite floor slab with adjustable height

Abstract

The invention relates to the technical field of building components, in particular to a height-adjustable prefabricated assembly type composite floor slab which comprises a supporting component, an auxiliary alignment device is fixedly mounted on the left side of the supporting component, and positioning devices are symmetrically inserted into the top end of the supporting component in a sliding mode. The auxiliary alignment device comprises first springs, a U-shaped support, alignment clamping keys and alignment clamping keys, the alignment clamping keys are fixedly installed at the top end of the U-shaped support, the first springs are fixedly installed in the U-shaped support at equal intervals, the alignment clamping keys are fixedly installed at the side ends of the first springs, and the supporting component comprises a retracting device, a limiting device, an extending device and a matching device. The retracting devices are fixedly installed in the two ends of the matching device, and the extending device is slidably inserted into the top end of the limiting device. Through the arrangement of the positioning device, the auxiliary alignment device and the supporting component, the purposes that interference is avoided when the composite floor slabs are placed, and the two composite floor slabs are in butt joint and matched in order are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of building components, and specifically relates to a prefabricated assembled composite floor slab with adjustable height. Background Art

[0002] Prefabricated composite floor slabs are a common form of building structure, combining the advantages of precast concrete slabs and cast-in-place concrete layers, and are widely used in buildings such as residential houses, office buildings, and industrial factories. Prefabricated composite floor slabs have the advantages of fast construction speed, controllable quality, and low cost. At the same time, the integrity and seismic performance of the floor slab are enhanced by the addition of the cast-in-place layer.

[0003] Prefabricated composite floor slabs are an efficient, economical, and environmentally friendly form of building structure, combining the advantages of precast concrete slabs and cast-in-place concrete layers, and are widely used in buildings such as residential houses, office buildings, and industrial factories. Through reasonable design and construction, the quality and performance of prefabricated composite floor slabs can be ensured to meet the functional and safety requirements of buildings.

[0004] For example, a prefabricated assembled composite floor slab with adjustable height disclosed in Chinese Patent Publication No. CN118029606B includes a casting layer. On both sides of the bottom of the casting layer, there are support plates. Angle steels are welded to the bottoms of the support plates. A first screw rod is installed in the casting layer and the support plates. An adapter rod is connected above the first screw rod. A height compensation component is installed in the adapter rod. A connecting rod is connected above the adapter rod. The connecting rod is lapped on a beam body. A support component is installed on the casting layer. A first composite floor slab reinforcement is welded below the support component. A second composite floor slab reinforcement is welded outside the first composite floor slab reinforcement.

[0005] Currently, when prefabricated composite floor slabs on the market are in use, due to the use of hoisting assembly and the presence of extended-length steel bars at both ends of the floor slab, interference occurs when hoisting and placing the composite floor slab, and it is impossible to neatly dock and fit two composite floor slabs. Therefore, a device is needed to improve the above problems. Summary of the Invention

[0006] In view of the problems in the prior art, the present invention provides a prefabricated assembled composite floor slab with adjustable height.

[0007] The technical solution adopted by the present invention to solve its technical problems is: an adjustable-height prefabricated composite floor slab, including a support component, an auxiliary alignment device is fixedly installed on the left side of the support component, positioning devices are symmetrically and slidably inserted at the top of the support component. The auxiliary alignment device includes a first spring, a U-shaped bracket, alignment keys and alignment keys. The alignment keys are fixedly installed at the top of the U-shaped bracket. The first spring is fixedly installed at equal intervals inside the U-shaped bracket. The alignment keys are fixedly installed at the side ends of the first spring. The support component includes a contraction device, a limiting device, an extension device and a matching device. The contraction device is fixedly installed inside both ends of the matching device. The extension device is slidably inserted at the top of the limiting device. The limiting devices are symmetrically and fixedly installed at the top of the matching device. The positioning device includes a connecting rod, a first insertion rod and a second insertion rod. The second insertion rods are symmetrically and fixedly installed at the bottom of one end of the connecting rod. The first insertion rod is fixedly installed at the bottom of the other end of the connecting rod.

[0008] Specifically, the contraction device includes a support sleeve, a threaded rod and a handle. The handle is rotatably installed inside the support sleeve. The threaded rod is fixedly installed at the center of the front end of the handle. A displacement cross frame is threadedly sleeved on the outer ring of the threaded rod away from the support sleeve. Reinforcing bars are fixedly installed at equal intervals on the side end of the displacement cross frame away from the support sleeve.

[0009] When the threaded rod rotates, it can drive the displacement cross frame to displace inside the storage groove.

[0010] Specifically, the limiting device includes an alignment sleeve, a pre-embedded part and a support cavity. The pre-embedded part is fixedly installed at the bottom end of the alignment sleeve. The support cavity is fixedly installed on the side end of the alignment sleeve. Second springs are symmetrically and fixedly installed on the inner side end of the support cavity away from the alignment sleeve. A cross plate is fixedly installed at one end of the second spring close to the alignment sleeve. An extension rod is fixedly installed at the side end of the cross plate close to the second spring. A handle is fixedly installed at the end of the extension rod away from the alignment sleeve. A limiting cross bar is fixedly installed at the center of the side end of the cross plate facing away from the handle.

[0011] When the handle is pulled, the limiting cross bar can be moved out of the alignment sleeve, and the movable vertical frame can be released.

[0012] Specifically, the extension device includes a connecting cross bar and a movable vertical frame. The movable vertical frames are fixedly installed at both ends of the connecting cross bar. A reinforcing bar frame is fixedly installed on the side end of the movable vertical frame facing away from the connecting cross bar. Reinforcing rods are fixedly installed at equal intervals at the bottom end of the reinforcing bar frame.

[0013] When the movable vertical frame moves inside the alignment sleeve, it can drive the reinforcing bar frame to displace and lift simultaneously.

[0014] Specifically, the matching device includes a precast floor slab and a placement groove. The placement groove is symmetrically opened at the top of the precast floor slab. Receiving grooves are opened inside the front and rear ends of the precast floor slab. A matching bottom frame is fixedly installed at the bottom right end of the precast floor slab.

[0015] When the U-shaped bracket is matched with the matching bottom frame, the two precast floor slabs can be restricted and aligned.

[0016] Specifically, the second insertion rod is slidably inserted into the top interior of the connecting cross bar. The first insertion rod is slidably inserted into the interior of the handle. The U-shaped bracket is fixedly installed on the side end of the precast floor slab away from the matching bottom frame. The movable vertical frame is slidably inserted into the top interior of the alignment sleeve. The embedded parts are symmetrically fixedly installed inside the precast floor slab. The strengthening rod is slidably inserted into the top interior of the precast floor slab. The support sleeve is fixedly installed at the inner center of the placement groove close to the receiving groove. The top and bottom ends of the displacement cross bar are respectively in contact with the inner top and bottom ends of the receiving groove.

[0017] Specifically, square keys are equidistantly fixedly installed at the bottom end of the U-shaped bracket, and square grooves are equidistantly opened inside the top end of the matching bottom frame. A groove is opened at the top of the side end of the precast floor slab close to the matching bottom frame, and a clamping groove is opened at the top end of the precast floor slab close to the matching bottom frame.

[0018] Specifically, circular holes are equidistantly opened inside the movable vertical frame facing away from the steel bar frame. Insertion keys are symmetrically fixedly installed at the top end of the alignment clamping key, and movable grooves are symmetrically opened at the top and bottom ends inside the U-shaped bracket. The bottom end of the side end of the alignment clamping key facing away from the U-shaped bracket is inclined at 45°.

[0019] Specifically, a threaded hole is opened inside the displacement cross bar, a through hole is opened inside the handle. The extension rod slidably penetrates through one end of the support cavity away from the alignment sleeve and is connected to the cross plate. An installation hole is opened inside the placement groove close to the receiving groove.

[0020] Specifically, the precast floor slab further includes an embedded bracket and a limiting side frame. The embedded brackets are symmetrically fixedly installed inside the front and rear ends of the precast floor slab, and the limiting side frame is fixedly installed on the embedded brackets.

[0021] Advantages of the present invention:

[0022] 1. When the handle of the present invention is rotated, it can drive the threaded rod to rotate. And since the displacement cross-frame is threadedly sleeved on the threaded rod, the displacement cross-frame can drive the steel bars to move into the receiving groove, avoiding interference between the steel bars and external objects when hoisting precast floor slabs. At the same time, the convenience of transporting precast floor slabs is improved. Moreover, when the connecting rod is in the installed state, it can drive the first insertion rod to insert into the handle, so that the threaded rod can be restricted and fixed to prevent the threaded rod from continuously rotating, completing the work of conveniently installing precast floor slabs.

[0023] 2. When two precast floor slabs are horizontally spliced in the present invention, it can drive the alignment key to insert into the precast floor slab, so that the two precast floor slabs can be sealed. At the same time, by inserting the U-shaped bracket into the top of the bottom frame, the accuracy of the docking of the two precast floor slabs can be improved. And since the alignment key fits with the top of the precast floor slab, it can prevent external concrete from entering the gap between the two precast floor slabs, completing the work of docking and matching the two precast floor slabs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below in conjunction with the drawings and embodiments.

[0025] Figure 1 It is a front perspective three-dimensional structure diagram of the main body in the present invention;

[0026] Figure 2 It is a front perspective three-dimensional structure diagram of the positioning device in the present invention;

[0027] Figure 3 It is a partial cross-sectional view of the auxiliary alignment device in the present invention;

[0028] Figure 4 It is a front perspective three-dimensional structure diagram of the support component in the present invention;

[0029] Figure 5 It is a front perspective three-dimensional structure diagram of the contraction device in the present invention;

[0030] Figure 6 It is a partial cross-sectional view of the limiting device in the present invention;

[0031] Figure 7 It is a front perspective three-dimensional structure diagram of the extension device in the present invention;

[0032] Figure 8 It is a partial cross-sectional view of the matching device in the present invention;

[0033] Figure 9 It is a side perspective three-dimensional structure diagram of the matching device in the present invention;

[0034] Figure 10This is a schematic perspective view of the front view of the second embodiment of the precast floor slab in the present invention.

[0035] In the figure: 1 - positioning device, 2 - auxiliary alignment device, 3 - support member, 4 - connecting rod, 5 - first insertion rod, 6 - second insertion rod, 7 - first spring, 8 - U-shaped bracket, 9 - alignment key, 10 - alignment key, 11 - contraction device, 12 - limiting device, 13 - extension device, 14 - matching device, 15 - threaded rod, 16 - support sleeve, 17 - handle, 18 - displacement cross frame, 19 - steel bar, 20 - alignment sleeve, 21 - limiting cross bar, 22 - cross plate, 23 - support cavity, 24 - extension rod, 25 - grip, 26 - second spring, 27 - embedded part, 28 - strengthening rod, 29 - steel bar frame, 30 - movable vertical frame, 31 - connecting cross bar, 32 - placement groove, 33 - matching bottom frame, 34 - storage groove, 35 - precast floor slab, 36 - embedded bracket, 37 - limiting side frame. Detailed implementation mode

[0036] In order to enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0037] The present invention will be further described below with reference to the accompanying drawings.

[0038] Embodiment 1

[0039] As Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown in the figure, an adjustable-height prefabricated composite floor slab of the present invention includes a support member 3. An auxiliary alignment device 2 is fixedly installed on the left side of the support member 3. Positioning devices 1 are symmetrically and slidably inserted at the top of the support member 3. The auxiliary alignment device 2 includes a first spring 7, a U-shaped bracket 8, alignment keys 9 and 10. The alignment key 10 is fixedly installed at the top of the U-shaped bracket 8. The first spring 7 is fixedly installed at equal intervals inside the U-shaped bracket 8. The alignment key 9 is fixedly installed at the side end of the first spring 7. The support member 3 includes a contraction device 11, a limiting device 12, an extension device 13 and a matching device 14. The contraction device 11 is fixedly installed inside both ends of the matching device 14. The extension device 13 is slidably inserted at the top of the limiting device 12. The limiting device 12 is symmetrically and fixedly installed at the top of the matching device 14. The positioning device 1 includes a connecting rod 4, a first insertion rod 5 and a second insertion rod 6. The second insertion rods 6 are symmetrically and fixedly installed at the bottom of one end of the connecting rod 4. The first insertion rod 5 is fixedly installed at the bottom of the other end of the connecting rod 4.

[0040] As Figure 5 , the contraction device 11 includes a support sleeve 16, a threaded rod 15 and a handle 17. The handle 17 is rotatably installed inside the support sleeve 16. The threaded rod 15 is fixedly installed at the front center of the handle 17. A displacement cross-frame 18 is threadedly sleeved on the outer ring of the threaded rod 15 away from the support sleeve 16. Reinforcing bars 19 are fixedly installed at equal intervals on the side end of the displacement cross-frame 18 away from the support sleeve 16. When the handle 17 rotates forward and backward, it can drive the displacement cross-frame 18 to reciprocate;

[0041] When the threaded rod 15 rotates, it can drive the displacement cross-frame 18 to displace inside the storage groove 34.

[0042] As Figure 6 , the limiting device 12 includes an alignment sleeve 20, an embedded part 27 and a support cavity 23. The embedded part 27 is fixedly installed at the bottom end of the alignment sleeve 20. The support cavity 23 is fixedly installed on the side end of the alignment sleeve 20. Second springs 26 are symmetrically and fixedly installed on the inner side end of the support cavity 23 away from the alignment sleeve 20. A cross plate 22 is fixedly installed at one end of the second spring 26 close to the alignment sleeve 20. An extension rod 24 is fixedly installed on the side end of the cross plate 22 close to the second spring 26. A grip 25 is fixedly installed at the end of the extension rod 24 away from the alignment sleeve 20. A limiting cross-bar 21 is fixedly installed at the center of the side end of the cross plate 22 facing away from the grip 25. By restricting the movable vertical frame 30 located inside the alignment sleeve 20 through the limiting cross-bar 21, the steel bar frame 29 can be supported for hoisting;

[0043] When the grip 25 is pulled, the limiting cross-bar 21 can be removed from the inside of the alignment sleeve 20, and the movable vertical frame 30 can be released.

[0044] As Figure 7, the extension device 13 includes a connecting cross bar 31 and a movable vertical frame 30. The movable vertical frame 30 is fixedly installed at both ends of the connecting cross bar 31. The steel bar frame 29 is fixedly installed on the side end of the movable vertical frame 30 facing away from the connecting cross bar 31. Reinforcing rods 28 are fixedly installed at equal intervals at the bottom end of the steel bar frame 29. By sliding the movable vertical frame 30 inside the top end of the alignment sleeve 20, the vertical displacement of the steel bar frame 29 can be facilitated;

[0045] When the movable vertical frame 30 moves inside the alignment sleeve 20, it can drive the steel bar frame 29 to displace and lift simultaneously.

[0046] Such as Figure 8 and Figure 9 , the matching device 14 includes a precast floor slab 35 and a placement groove 32. The placement grooves 32 are symmetrically opened at the top end of the precast floor slab 35. Receiving grooves 34 are opened inside the front and rear ends of the precast floor slab 35. A matching bottom frame 33 is fixedly installed at the right bottom end of the precast floor slab 35. Due to the certain depth inside the receiving groove 34, the steel bars 19 can be received inside the receiving groove 34;

[0047] When the U-shaped bracket 8 cooperates with the matching bottom frame 33, the two precast floor slabs 35 can be restricted in alignment.

[0048] The second insertion rod 6 is slidably inserted inside the top end of the connecting cross bar 31. The first insertion rod 5 is slidably inserted inside the handle 17. The U-shaped bracket 8 is fixedly installed on the side end of the precast floor slab 35 away from the matching bottom frame 33. The movable vertical frame 30 is slidably inserted inside the top end of the alignment sleeve 20. The embedded parts 27 are symmetrically fixedly installed inside the precast floor slab 35. The reinforcing rods 28 are slidably inserted inside the top end of the precast floor slab 35. The support sleeve 16 is fixedly installed at the inner center of the placement groove 32 close to the receiving groove 34. The top and bottom ends of the displacement cross bar 18 are respectively in contact with the inner top and bottom ends of the receiving groove 34. Square keys are fixedly installed at equal intervals at the bottom end of the U-shaped bracket 8, and square grooves are opened at equal intervals inside the top end of the matching bottom frame 33. A groove is opened at the top of the side end of the precast floor slab 35 close to the matching bottom frame 33. A clamping groove is opened at the top end of the precast floor slab 35 close to the matching bottom frame 33. Circular holes are opened at equal intervals inside the movable vertical frame 30 facing away from the steel bar frame 29. Insertion keys are symmetrically fixedly installed at the top end of the alignment clamping key 9, and movable grooves are symmetrically opened at the top and bottom ends inside the U-shaped bracket 8. The bottom end of the side end of the alignment clamping key 9 facing away from the U-shaped bracket 8 is inclined at 45°. A threaded hole is opened inside the displacement cross bar 18. A through hole is opened inside the handle 17. The extension rod 24 slidably penetrates through one end of the support cavity 23 away from the alignment sleeve 20 and is connected to the cross plate 22. An installation hole is opened inside the placement groove 32 close to the receiving groove 34.

[0049] The working principle of Embodiment 1 is as follows: When in use, the lifting hook can be buckled on the steel bar rack 29, so that when the crane is started, the precast floor slab 35 can be integrally moved and transported until the precast floor slab 35 is hoisted and placed on the roof beam to complete the hoisting work of the precast floor slab 35. Subsequently, the connecting rod 4 can be moved upward until the first inserting rod 5 and the second inserting rod 6 are respectively removed from the inside of the handle 17 and the connecting cross bar 31, and then the handle 17 is screwed and rotated to drive the threaded rod 15 to rotate inside the rotating support sleeve 16. Since the displacement cross frame 18 is threadedly sleeved on the outer ring of the threaded rod 15, when the threaded rod 15 rotates, it can drive the displacement cross frame 18 to move outward from the inside of the storage groove 34, which is convenient for binding the steel bar 19 with the external steel bars. Moreover, when the steel bar 19 is inside the storage groove 34, it can prevent the precast floor slab 35 from contacting external objects or people during hoisting, improving the safety when hoisting the precast floor slab 35. Subsequently, two workers can be located at both ends of the precast floor slab 35 respectively, and then the two grips 25 are respectively pulled towards the end far away from the alignment sleeve 20 until the limiting cross bar 21 is removed from the inside of the movable vertical frame 30, so that the movable vertical frame 30 can be released. At this time, the third worker can pull the entire steel bar rack 29 upward until the round hole on the movable vertical frame 30 is aligned with the limiting cross bar 21. Then, the workers at both ends of the precast floor slab 35 can release the grips 25. Due to the elasticity of the second spring 26, it will drive the cross plate 22 to quickly reset, so that the limiting cross bar 21 can be inserted into the inside of the movable vertical frame 30, thereby supporting the steel bar rack 29 at a specified height and completing the work of upwardly adjusting and supporting the height of the steel bar rack 29. Moreover, when the steel bar rack 29 moves, it can drive the strengthening rod 28 to slide inside the top of the precast floor slab 35, so as to improve the stability of the steel bar rack 29. Subsequently, when the adjustment of the steel bar rack 29 is completed, the connecting rod 4 can be moved to the top of the precast floor slab 35. When the handle 17 is rotated forward and backward to the limit position, it can drive the through hole on the handle 17 to be vertically upward. When the connecting rod 4 is placed on the top of the precast floor slab 35, it can drive the first inserting rod 5 and the second inserting rod 6 to be respectively inserted into the top inside of the handle 17 and the connecting cross bar 31, thereby restricting and fixing the handle 17 and preventing the threaded rod 15 from rotating again, completing the installation work of one precast floor slab 35. Subsequently, the above steps can be repeated to hoist the second precast floor slab 35 to the side of the first precast floor slab 35. At this time, when the second precast floor slab 35 is hoisted and lowered, the U-shaped bracket 8 can be vertically aligned with the matching bottom frame 33. When the second precast floor slab 35 moves vertically downward, it can drive the alignment key 9 to contact the top of the precast floor slab 35 close to the matching bottom frame 33. Since the bottom of the side end of the alignment key 9 is inclined at 45°, it can improve the smoothness of the contact between the alignment key 9 and the precast floor slab 35, facilitating the alignment key 9 to pass through the top of the precast floor slab 35. Subsequently, when the second precast floor slab 35 moves downward to the limit position, it can drive the square key at the bottom of the U-shaped bracket 8 to be inserted into the square groove inside the top of the matching bottom frame 33, and,The alignment key 10 can be synchronously inserted into the card slot on the top end of the precast floor slab 35, so that the square key at the bottom end of the U-shaped bracket 8 is inserted into and matched with the square groove at the top end of the chassis 33. The alignment key 10 is inserted into the card slot on the top end of the precast floor slab 35, which can improve the assembly stability between the two precast floor slabs 35. Moreover, when the second precast floor slab 35 is placed in the specified installation area, it can drive the alignment key 9 to align with the groove near the side end of the chassis 33 of the precast floor slab 35. The elasticity of the first spring 7 will drive the alignment key 9 to be inserted into the groove on the side end of the precast floor slab 35. And, by the sliding of the key at the top end of the alignment key 9 in the movable slot at the inner top end of the U-shaped bracket 8, it can ensure that the alignment key 9 moves in a straight line, improving the docking accuracy between the alignment key 9 and the groove, and completing the work.

[0050] Embodiment 2

[0051] On the basis of Embodiment 1, as Figure 10 shown, the precast floor slab 35 further includes embedded brackets 36 and limiting side brackets 37. The embedded brackets 36 are symmetrically and fixedly installed inside the front and rear ends of the precast floor slab 35, and the limiting side brackets 37 are fixedly installed on the embedded brackets 36.

[0052] When implementing this embodiment, since the limiting side bracket 37 is 5 cm higher than the precast floor slab 35, when two precast floor slabs 35 need to be aligned and spliced, the two ends of the precast floor slab 35 in the hoisting state can be attached to the inner wall of the limiting side bracket 37, so that when the second precast floor slab 35 is lowered, the precast floor slab 35 will move downward in a straight line, improving the docking accuracy between the two precast floor slabs 35 and avoiding the phenomenon of skew when hoisting the second precast floor slab 35, and completing the work.

[0053] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A prefabricated composite floor slab with adjustable height, comprising a supporting component (3), an auxiliary alignment device (2) being fixedly mounted on the left side of the supporting component (3), and a positioning device (1) being symmetrically slidably plugged into the top of the supporting component (3), characterized in that: The auxiliary alignment device (2) comprises a first spring (7), a U-shaped bracket (8), an alignment key (9) and an alignment key (10), wherein the alignment key (10) is fixedly mounted on the top of the U-shaped bracket (8), the first spring (7) is fixedly mounted inside the U-shaped bracket (8) at an equal distance, and the alignment key (9) is fixedly mounted on the side end of the first spring (7); the support component (3) comprises a contraction device (11), a restriction device (12), an extension device (13) and a matching device (14), wherein the contraction device (11) is fixedly mounted inside both ends of the matching device (14), the extension device (13) is slidably inserted into the top of the restriction device (12), and the restriction device (12) is symmetrically fixedly mounted on the top of the matching device (14); the positioning device (1) comprises a connecting rod (4), a first insertion rod (5) and a second insertion rod (6), wherein the second insertion rod (6) is symmetrically fixedly mounted on the bottom of one end of the connecting rod (4), and the first insertion rod (5) is fixedly mounted on the bottom of the other end of the connecting rod (4).

2. The height-adjustable prefabricated composite floor according to claim 1, characterized in that: The contraction device (11) comprises a support sleeve (16), a threaded rod (15) and a handle (17); the handle (17) is rotatably mounted inside the support sleeve (16); the threaded rod (15) is fixedly mounted at the front end center of the handle (17); a displacement cross frame (18) is threadedly sleeved on the outer ring of the threaded rod (15) away from the support sleeve (16); and a steel bar (19) is fixedly mounted at an equal distance on the side end of the displacement cross frame (18) away from the support sleeve (16); When the threaded rod (15) rotates, it can drive the displacement cross frame (18) to move inside the receiving groove (34).

3. The height-adjustable prefabricated composite floor slab according to claim 2, characterized in that: The limiting device (12) comprises an alignment sleeve (20), an embedded part (27) and a supporting cavity (23), wherein the embedded part (27) is fixedly mounted on the bottom end of the alignment sleeve (20), and the supporting cavity (23) is fixedly mounted on the side end of the alignment sleeve (20); a second spring (26) is symmetrically fixedly mounted on the inner side end of the supporting cavity (23) away from the alignment sleeve (20); a transverse plate (22) is fixedly mounted on one end of the second spring (26) close to the alignment sleeve (20); an extension rod (24) is fixedly mounted on the side end of the transverse plate (22) close to the second spring (26); a handle (25) is fixedly mounted on one end of the extension rod (24) away from the alignment sleeve (20); and a limiting transverse rod (21) is fixedly mounted on the center of the side end of the transverse plate (22) away from the handle (25); When the handle (25) is pulled, the limiting cross bar (21) can be moved out from the interior of the alignment sleeve (20), thereby releasing the movable vertical frame (30).

4. The height-adjustable prefabricated composite floor slab according to claim 3, characterized in that: The extending device (13) comprises a connecting crossbar (31) and a movable vertical frame (30), wherein the movable vertical frame (30) is fixedly mounted at both ends of the connecting crossbar (31), the steel bar frame (29) is fixedly mounted on the side end of the movable vertical frame (30) away from the connecting crossbar (31), and the bottom end of the steel bar frame (29) is fixedly mounted with reinforcing rods (28) at equal distances; When the movable vertical frame (30) moves inside the alignment sleeve (20), it can drive the steel bar frame (29) to move and lift at the same time.

5. The height-adjustable prefabricated composite floor slab according to claim 4, characterized in that: The matching device (14) comprises a prefabricated floor (35) and a placement groove (32), wherein the placement groove (32) is symmetrically arranged at the top of the prefabricated floor (35), and storage grooves (34) are arranged inside the front and rear ends of the prefabricated floor (35), and a matching base frame (33) is fixedly installed at the right bottom end of the prefabricated floor (35); When the U-shaped bracket (8) cooperates with the matching base frame (33), the two prefabricated floor slabs (35) can be restricted in alignment.

6. The height-adjustable prefabricated composite floor slab according to claim 5, characterized in that: The second insertion rod (6) is slidably inserted into the top end of the connecting cross bar (31), the first insertion rod (5) is slidably inserted into the handle (17), the U-shaped bracket (8) is fixedly installed on the side end of the prefabricated floor (35) away from the matching base frame (33), the movable vertical frame (30) is slidably inserted into the top end of the alignment sleeve (20), the embedded part (27) is symmetrically fixedly installed inside the prefabricated floor (35), the reinforcement rod (28) is slidably inserted into the top end of the prefabricated floor (35), the support sleeve (16) is fixedly installed in the placement groove (32) near the internal center of the storage groove (34), and the top and bottom ends of the displacement cross frame (18) are respectively fitted with the internal top and bottom ends of the storage groove (34).

7. The height-adjustable prefabricated composite floor slab according to claim 6, characterized in that: The bottom end of the U-shaped bracket (8) is fixedly provided with square keys at equal intervals, and the top of the matching base frame (33) is provided with square grooves at equal intervals, the top of the side end of the prefabricated floor slab (35) close to the matching base frame (33) is provided with a groove, and the top of the prefabricated floor slab (35) close to the matching base frame (33) is provided with a card slot.

8. The height-adjustable prefabricated composite floor slab according to claim 7, characterized in that: The movable vertical frame (30) is provided with circular holes at equal distances from the inner side of the steel bar frame (29), the top of the alignment key (9) is symmetrically fixed with an insertion key, and the inner top and bottom of the U-shaped bracket (8) are symmetrically provided with movable grooves, and the bottom of the side end of the alignment key (9) away from the U-shaped bracket (8) is inclined at 45 degrees.

9. The height-adjustable prefabricated composite floor slab according to claim 8, characterized in that: A threaded hole is provided inside the displacement cross frame (18), a through hole is provided inside the handle (17), the extension rod (24) slides through the support cavity (23) and is connected to the cross plate (22) at one end away from the alignment sleeve (20), and a mounting hole is provided inside the placement groove (32) near the storage groove (34).

10. The height-adjustable prefabricated composite floor slab according to claim 9, characterized in that: The prefabricated floor slab (35) further comprises an embedded bracket (36) and a limiting side frame (37), wherein the embedded bracket (36) is symmetrically fixedly installed inside the front and rear ends of the prefabricated floor slab (35), and the limiting side frame (37) is fixedly installed on the embedded bracket (36).

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