An adjustable height prefabricated assembly type composite floor

Abstract

The present application relates to the technical field of building components, in particular to a prefabricated assembly type composite floor with adjustable height, comprising a supporting part, an auxiliary alignment device is fixedly installed on the left side of the supporting part, a positioning device is symmetrically and slidingly inserted into the top end of the supporting part, the auxiliary alignment device comprises a first spring, a U-shaped support, an alignment key and an alignment key, the alignment key is fixedly installed at the top end of the U-shaped support, the first spring is equidistantly and fixedly installed in the interior of the U-shaped support, the alignment key is fixedly installed on the side end of the first spring, the supporting part comprises a contraction device, a limiting device, an extension device and a matching device, the contraction device is fixedly installed in the interior of both ends of the matching device, and the extension device is slidingly inserted into the top end of the limiting device. Through the setting of the positioning device, the auxiliary alignment device and the supporting part, the purpose of preventing interference when the composite floor is placed and neatly butting and matching two composite floors is achieved.

Description

Technical Field

[0001] This invention relates to the field of building component technology, specifically to an adjustable-height prefabricated composite floor slab. Background Technology

[0002] Precast composite floor slabs are a common building structure that combines the advantages of precast concrete slabs and cast-in-place concrete layers. They are widely used in residential, office, and industrial buildings. Precast composite floor slabs offer advantages such as fast construction speed, controllable quality, and lower cost. Furthermore, the addition of a cast-in-place layer enhances the overall integrity and seismic performance of the floor slab.

[0003] Precast composite floor slabs are an efficient, economical, and environmentally friendly building structure that combines the advantages of precast concrete slabs and cast-in-place concrete layers. They are widely used in residential, office, and industrial buildings. Through proper design and construction, the quality and performance of precast composite floor slabs can be ensured, meeting the functional and safety requirements of the building.

[0004] For example, a prefabricated composite floor slab with adjustable height, as disclosed in Chinese Patent Publication No. CN118029606B, includes a cast-in-place layer, with support plates on both sides of the bottom of the cast-in-place layer. Angle steel is welded to the bottom of the support plates. A first screw is installed inside the cast-in-place layer and the support plates. A connecting rod is connected above the first screw. A height compensation component is installed inside the connecting rod. A connecting rod is connected above the connecting rod. The connecting rod overlaps on the beam. A support component is installed on the cast-in-place layer. A first composite slab reinforcement is welded below the support component. A second composite slab reinforcement is welded to the outside of the first composite slab reinforcement.

[0005] Currently, when using precast composite floor slabs on the market, interference and the inability to neatly connect two composite floor slabs occur during the hoisting and placement of the slabs due to the hoisting assembly method and the presence of extended steel bars at both ends of the slabs. Therefore, an improved device is needed to address these issues. Summary of the Invention

[0006] To address the problems in the prior art, the present invention provides a prefabricated composite floor slab with adjustable height.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: an adjustable-height prefabricated composite floor slab, including a supporting component, an auxiliary alignment device fixedly installed on the left side of the supporting component, and a positioning device symmetrically slidably inserted into the top of the supporting component. The auxiliary alignment device includes a first spring, a U-shaped bracket, an alignment key, and an alignment lock key. The alignment lock key is fixedly installed at the top of the U-shaped bracket. The first spring is equidistantly fixedly installed inside the U-shaped bracket. The alignment lock key is fixedly installed on the side end of the first spring. The supporting component includes a shrinking device, a limiting device, an extending device, and a mating device. The shrinking device is fixedly installed inside both ends of the mating device. The extending device is slidably inserted into the top of the limiting device. The limiting device is symmetrically fixedly installed at the top of the mating device. The positioning device includes a connecting rod, a first insert rod, and a second insert rod. The second insert rod is symmetrically fixedly installed at the bottom of one end of the connecting rod, and the first insert rod is fixedly installed at the bottom of the other end of the connecting rod.

[0008] Specifically, the retraction device includes a support sleeve, a threaded rod, and a handle. The handle is rotatably installed inside the support sleeve, and the threaded rod is fixedly installed at the front center of the handle. A displacement crossbar is threaded onto the outer ring of the threaded rod away from the support sleeve, and steel bars are fixedly installed at equal intervals on the side end of the displacement crossbar away from the support sleeve.

[0009] When the threaded rod rotates, it can cause the displacement crossbar to move inside the receiving groove.

[0010] Specifically, the limiting device includes an alignment sleeve, an embedded part, and a supporting cavity. The embedded part is fixedly installed at the bottom end of the alignment sleeve, and the supporting cavity is fixedly installed on the side end of the alignment sleeve. A second spring is symmetrically fixedly installed on the inner side of the supporting cavity away from the alignment sleeve. A horizontal plate is fixedly installed on the end of the second spring near the alignment sleeve. An extension rod is fixedly installed on the side end of the horizontal plate near the second spring. A handle is fixedly installed on the end of the extension rod away from the alignment sleeve. A limiting horizontal bar is fixedly installed on the center of the side end of the horizontal plate away from the handle.

[0011] When the grip is pulled, the limiting crossbar can be moved out from inside the aligning sleeve, releasing the movable vertical frame.

[0012] Specifically, the extension device includes a connecting crossbar and a movable vertical frame. The movable vertical frame is fixedly installed at both ends of the connecting crossbar, and the steel reinforcement frame is fixedly installed on the side end of the movable vertical frame away from the connecting crossbar. Reinforcing bars are fixedly installed at equal intervals at the bottom end of the steel reinforcement frame.

[0013] When the movable vertical frame moves inside the alignment sleeve, it can simultaneously drive the steel reinforcement frame to shift and lift.

[0014] Specifically, the fitting device includes a precast floor slab and a placement groove. The placement groove is symmetrically opened at the top of the precast floor slab. The front and rear ends of the precast floor slab are provided with storage grooves. A fitting base frame is fixedly installed at the bottom right side of the precast floor slab.

[0015] When the U-shaped bracket is used in conjunction with the base frame, it can restrict the alignment of the two precast floor slabs.

[0016] Specifically, the second insert rod is slidably inserted into the top of the connecting crossbar, the first insert rod is slidably inserted into the handle, the U-shaped bracket is fixedly installed on the side of the precast floor slab away from the base frame, the movable vertical frame is slidably inserted into the top of the alignment sleeve, the embedded parts are symmetrically fixedly installed inside the precast floor slab, the reinforcing rod is slidably inserted into the top of the precast floor slab, the support sleeve is fixedly installed in the center of the placement slot near the storage slot, and the top and bottom of the displacement crossbar are respectively attached to the top and bottom of the storage slot.

[0017] Specifically, square keys are fixedly installed at equal intervals at the bottom end of the U-shaped bracket, and square grooves are opened at equal intervals inside the top end of the mating base frame. A groove is opened at the top of the side end of the precast floor slab near the mating base frame, and a slot is opened at the top end of the precast floor slab near the mating base frame.

[0018] Specifically, the movable vertical frame has round holes equidistantly opened inside away from the steel frame, the top of the alignment key is symmetrically fixed with a key, and the top and bottom of the U-shaped bracket have movable grooves symmetrically opened inside, and the bottom of the alignment key is inclined at 45° away from the side of the U-shaped bracket.

[0019] Specifically, the displacement crossbar has a threaded hole inside, the handle has a through hole inside, the extension rod slides through the support cavity and is connected to the cross plate at the end away from the alignment sleeve, and the placement slot has an installation hole inside near the storage slot.

[0020] Specifically, the precast floor slab also includes embedded supports and limiting side frames. The embedded supports are symmetrically fixed inside the front and rear ends of the precast floor slab, and the limiting side frames are fixedly installed on the embedded supports.

[0021] The beneficial effects of this invention are:

[0022] First, this invention allows the threaded rod to rotate when the handle is turned, and the displacement crossbar is threaded onto the threaded rod, enabling the displacement crossbar to move the reinforcing bar into the receiving groove. This avoids interference between the reinforcing bar and external objects when hoisting the precast floor slab, and also improves the convenience of transporting the precast floor slab. Furthermore, when the connecting rod is in the installation state, it can drive the first insert rod to be inserted into the handle, thereby restricting and fixing the threaded rod and preventing it from rotating continuously, thus completing the convenient installation of the precast floor slab.

[0023] Second, when two precast floor slabs are horizontally spliced, the present invention can drive the alignment key to be inserted into the interior of the precast floor slab, so that the two precast floor slabs can be sealed. At the same time, the U-shaped bracket is inserted into the top of the matching base frame, which can improve the accuracy of the two precast floor slabs during the docking. Furthermore, the alignment key fits with the top of the precast floor slab, which can prevent external concrete from entering the gap between the two precast floor slabs, thus completing the docking and fitting of the two precast floor slabs. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is a three-dimensional structural diagram of the main body from a frontal perspective in this invention;

[0026] Figure 2 This is a three-dimensional structural diagram of the positioning device from the front view in this invention;

[0027] Figure 3 This is a partial cross-sectional schematic diagram of the auxiliary alignment device in this invention;

[0028] Figure 4 This is a three-dimensional structural diagram of the support component from a frontal view in this invention;

[0029] Figure 5 This is a three-dimensional structural diagram of the retraction device from the front view in this invention;

[0030] Figure 6 This is a partial cross-sectional schematic diagram of the limiting device in this invention;

[0031] Figure 7 This is a three-dimensional structural diagram of the extension device from the front view in this invention;

[0032] Figure 8 This is a partial cross-sectional schematic diagram of the mating device in this invention;

[0033] Figure 9 This is a three-dimensional structural diagram of the mating device from a side view in this invention;

[0034] Figure 10This is a frontal perspective three-dimensional structural diagram of the second embodiment of the precast floor slab in this invention.

[0035] In the diagram: 1-Positioning device, 2-Auxiliary alignment device, 3-Supporting component, 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-Retraction device, 12-Restriction device, 13-Extension device, 14-Matching device, 15-Threaded rod, 16-Support sleeve, 17-Handle, 18-Displacement crossbeam, 19-Reinforcing bar, 20-Alignment sleeve, 21-Restriction crossbeam, 22-Horizontal plate, 23-Supporting cavity, 24-Extension rod, 25-Grip, 26-Second spring, 27-Embedded part, 28-Reinforcing rod, 29-Reinforcing bar frame, 30-Modible vertical frame, 31-Connecting crossbeam, 32-Placement slot, 33-Matching base frame, 34-Storage slot, 35-Precast floor slab, 36-Embedded bracket, 37-Restriction side frame. Detailed Implementation

[0036] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

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

[0038] Example 1

[0039] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, an adjustable-height prefabricated composite floor slab of the present invention includes a support component 3. An auxiliary alignment device 2 is fixedly installed on the left side of the support component 3. A positioning device 1 is symmetrically slidably inserted into the top of the support component 3. The auxiliary alignment device 2 includes a first spring 7, a U-shaped bracket 8, an alignment key 9, and an alignment key 10. The alignment key 10 is fixedly installed at the top of the U-shaped bracket 8. The first spring 7 is equidistantly fixedly installed inside the U-shaped bracket 8. The alignment key 9 is fixedly installed on the side end of the first spring 7. The support component 3 includes a shrinking device 11, a limiting device 12, an extension device 13, and a mating device 14. The shrinking device 11 is fixedly installed inside both ends of the mating device 14. The extension device 13 is slidably inserted into the top of the limiting device 12. The limiting device 12 is symmetrically fixedly installed at the top of the mating device 14. The positioning device 1 includes a connecting rod 4, a first insert rod 5, and a second insert rod 6. The second insert rod 6 is symmetrically fixedly installed at the bottom of one end of the connecting rod 4. The first insert rod 5 is fixedly installed at the bottom of the other end of the connecting rod 4.

[0040] like Figure 5 The retraction 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 crossbeam 18 is threaded onto 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 crossbeam 18 away from the support sleeve 16. When the handle 17 rotates in both directions, it can drive the displacement crossbeam 18 to move back to its original position.

[0041] When the threaded rod 15 rotates, it can drive the displacement crossbar 18 to move inside the receiving groove 34.

[0042] like 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, and the support cavity 23 is fixedly installed on the side end of the alignment sleeve 20. A second spring 26 is symmetrically fixedly installed on the inner side end of the support cavity 23 away from the alignment sleeve 20. A horizontal plate 22 is fixedly installed on the end of the second spring 26 near the alignment sleeve 20. An extension rod 24 is fixedly installed on the side end of the horizontal plate 22 near the second spring 26. A handle 25 is fixedly installed on the end of the extension rod 24 away from the alignment sleeve 20. A limiting horizontal bar 21 is fixedly installed on the center of the side end of the horizontal plate 22 away from the handle 25. The limiting horizontal bar 21 restricts the movable vertical frame 30 located inside the alignment sleeve 20, so that the steel bar frame 29 can be supported for hoisting.

[0043] When the handle 25 is pulled, the limiting bar 21 can be moved out from inside the alignment sleeve 20, which can release the movable vertical bracket 30.

[0044] like Figure 7The extension device 13 includes a connecting horizontal bar 31 and a movable vertical frame 30. The movable vertical frame 30 is fixedly installed at both ends of the connecting horizontal bar 31. The steel bar frame 29 is fixedly installed on the side end of the movable vertical frame 30 away from the connecting horizontal bar 31. The bottom end of the steel bar frame 29 is fixedly installed with reinforcing bars 28 at equal intervals. The movable vertical frame 30 slides inside the top end of the alignment sleeve 20, which facilitates the vertical displacement of the steel bar frame 29.

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

[0046] like Figure 8 and Figure 9 The fitting device 14 includes a precast floor slab 35 and a placement groove 32. The placement groove 32 is symmetrically opened at the top of the precast floor slab 35. The front and rear ends of the precast floor slab 35 are provided with storage grooves 34. The bottom right side of the precast floor slab 35 is fixedly installed with a fitting base frame 33. The storage groove 34 has a certain depth, which allows the steel bar 19 to be stored inside the storage groove 34.

[0047] When the U-shaped bracket 8 is used in conjunction with the base frame 33, it can restrict the alignment of the two precast floor slabs 35.

[0048] The second insert rod 6 is slidably inserted into the top of the connecting crossbar 31, the first insert rod 5 is slidably inserted into the handle 17, the U-shaped bracket 8 is fixedly installed on the side of the precast floor slab 35 away from the mating base frame 33, the movable vertical frame 30 is slidably inserted into the top of the aligning sleeve 20, the embedded parts 27 are symmetrically fixedly installed inside the precast floor slab 35, the reinforcing rod 28 is slidably inserted into the top of the precast floor slab 35, the supporting sleeve 16 is fixedly installed in the center of the placement groove 32 near the storage groove 34, the top and bottom of the displacement crossbar 18 are respectively attached to the top and bottom of the storage groove 34, and square keys are fixedly installed at equal intervals at the bottom of the U-shaped bracket 8, and the top of the mating base frame 33 is equidistantly opened. The precast floor slab 35 has a square groove at the top of its side end near the base frame 33, and a slot at the top of its top end near the base frame 33. The movable vertical frame 30 has round holes equidistantly spaced inside, away from the steel frame 29. The top of the alignment key 9 is symmetrically fixed with a key. The top and bottom of the U-shaped bracket 8 have movable grooves symmetrically spaced. The bottom of the alignment key 9 is inclined at 45° away from the side end of the U-shaped bracket 8. The displacement horizontal frame 18 has a threaded hole inside. The handle 17 has a through hole inside. The extension rod 24 slides through the support cavity 23 and connects to the horizontal plate 22 at one end away from the alignment sleeve 20. The placement groove 32 has an installation hole inside, near the storage groove 34.

[0049] The working principle of Example 1 is as follows: During use, the lifting hook can be attached to the steel reinforcement frame 29, allowing the precast floor slab 35 to be moved and transported as a whole when the crane is started, until the precast floor slab 35 is lifted and placed on the roof beam, completing the lifting operation of the precast floor slab 35. Subsequently, the connecting rod 4 can be moved upwards until the first insert rod 5 and the second insert rod 6 are removed from the handle 17 and the connecting crossbar 31 respectively. Then, the handle 17 is turned, causing the threaded rod 15 to rotate inside the rotating support sleeve 16. The displacement crossbar 18 is threaded onto the outer ring of the threaded rod 15, so that when the threaded rod 15 rotates, it can drive the displacement crossbar 18 to move outwards from inside the receiving groove 34, facilitating the binding of the steel reinforcement 19 with external steel reinforcement. Furthermore, when the steel reinforcement 19... When the precast floor slab 35 is inside the receiving slot 34, it can prevent the precast floor slab 35 from coming into contact with external objects or people during hoisting, thus improving the safety of hoisting the precast floor slab 35. Subsequently, two workers can be positioned at opposite ends of the precast floor slab 35 and pull the two handles 25 away from the end of the alignment sleeve 20 until the limiting crossbar 21 moves out of the interior of the movable vertical frame 30, allowing the movable vertical frame 30 to be released. At this point, a third worker can pull the steel frame 29 upwards as a whole until the round hole on the movable vertical frame 30 aligns with the limiting crossbar 21. Then, the workers at both ends of the precast floor slab 35 can release the handles 25. The elasticity of the second spring 26 will cause the crossbar 22 to quickly reset, allowing the limiting crossbar 21 to be inserted into the interior of the movable vertical frame 30, thereby allowing the precast floor slab 35 to be released. The reinforcing steel frame 29 is supported at a designated height, allowing for upward adjustment of its support height. Furthermore, during displacement, the reinforcing steel frame 29 drives the reinforcing rod 28 to slide within the top of the precast floor slab 35, enhancing its stability. After adjustment, the connecting rod 4 can be moved to the top of the precast floor slab 35. Rotating the handle 17 to its extreme positions in both directions causes the through-hole on the handle 17 to point vertically upwards. When the connecting rod 4 is placed at the top of the precast floor slab 35, it allows the first insert rod 5 and the second insert rod 6 to be inserted into the top of the handle 17 and the connecting crossbar 31 respectively, thus fixing the handle 17 and preventing the threaded rod 15 from rotating again, completing the installation of one precast floor slab 35. After installation, the above steps can be repeated to hoist the second precast floor slab 35 to the side of the first precast floor slab 35. When the second precast floor slab 35 is hoisted and lowered, the U-shaped bracket 8 can be vertically aligned with the mating base frame 33. As the second precast floor slab 35 moves vertically downwards, the alignment key 9 will contact the top of the mating base frame 33. The alignment key 9 is inclined at a 45° angle at its bottom side, improving the smoothness of contact between the alignment key 9 and the precast floor slab 35 and facilitating its passage over the top of the precast floor slab 35. Then, when the second precast floor slab 35 moves downwards to its limit position, the square key at the bottom of the U-shaped bracket 8 will insert into the square groove inside the top of the mating base frame 33.The alignment key 10 can be simultaneously inserted into the slot on the top of the precast floor slab 35, thereby allowing the square key at the bottom of the U-shaped bracket 8 to insert into the square slot at the top of the base frame 33. The insertion of the alignment key 10 into the slot at the top of the precast floor slab 35 improves the assembly stability between the two precast floor slabs 35. Furthermore, when the second precast floor slab 35 is placed in the designated installation area, it can align the alignment key 9 with the groove on the side of the base frame 33 near the precast floor slab 35. The elasticity of the first spring 7 will cause the alignment key 9 to insert into the groove on the side of the precast floor slab 35. Moreover, the key at the top of the alignment key 9 slides in the movable slot at the top of the U-shaped bracket 8, ensuring that the alignment key 9 moves in a straight line, improving the accuracy of the alignment between the alignment key 9 and the groove, thus completing the work.

[0050] Example 2

[0051] Based on Example 1, such as Figure 10 As shown, the precast floor slab 35 also includes embedded brackets 36 and limiting side frames 37. The embedded brackets 36 are symmetrically fixedly installed inside the front and rear ends of the precast floor slab 35, and the limiting side frames 37 are fixedly installed on the embedded brackets 36.

[0052] In implementing this embodiment, by limiting the side frame 37 to be 5 cm higher than the precast floor slab 35, when it is necessary to align and splice the two precast floor slabs 35, the two ends of the precast floor slab 35 in the hoisting state can be attached to the inner wall of the limiting side frame 37, so that when the second precast floor slab 35 is lowered, the precast floor slab 35 will move downward along a straight line, improving the docking accuracy of the two precast floor slabs 35 and avoiding the phenomenon of skewing when hoisting the second precast floor slab 35, thus completing the work.

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

Claims

1. A prefabricated composite floor slab with adjustable height, comprising a support component (3), wherein an auxiliary alignment device (2) is fixedly installed on the upper left side of the support component (3), and a positioning device (1) is symmetrically slidably inserted into the top of the support component (3), characterized in that: The auxiliary alignment device (2) includes a first spring (7), a U-shaped bracket (8), an alignment key (9), and an alignment key (10). The alignment key (10) is fixedly installed at the top of the U-shaped bracket (8). The first spring (7) is equidistantly fixedly installed inside the U-shaped bracket (8). The alignment key (9) is fixedly installed on the side end of the first spring (7). The support component (3) includes a shrinking device (11), a limiting device (12), an extension device (13), and a mating device (14). The shrinking device (11) is fixedly installed inside both ends of the mating device (14). The extension device (13) is slidably inserted into the... The limiting device (12) is symmetrically fixedly installed at the top of the mating device (14). The positioning device (1) includes a connecting rod (4), a first insert rod (5), and a second insert rod (6). The second insert rod (6) is symmetrically fixedly installed at the bottom of one end of the connecting rod (4), and the first insert rod (5) is fixedly installed at the bottom of the other end of the connecting rod (4). The retraction 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), and the threaded rod (15) is fixedly installed at the center of the front end of the handle (17). The threaded rod (15) is threaded with a displacement crossbeam (18) on its outer ring away from the support sleeve (16). Reinforcing bars (19) are fixedly installed at equal intervals on the side end of the displacement crossbeam (18) away from the support sleeve (16). When the threaded rod (15) rotates, it can drive the displacement crossbeam (18) to move within the receiving groove (34). The limiting device (12) includes an alignment sleeve (20), an embedded part (27), and a supporting cavity (23). The embedded part (27) is fixedly installed at the bottom end of the alignment sleeve (20), and the supporting cavity (23) is fixedly installed on the side end of the alignment sleeve (20). The supporting cavity (23) is threaded with a displacement crossbeam (18) on its outer ring away from the support sleeve (16). A second spring (26) is symmetrically fixedly installed on the inner side of the positioning sleeve (20). A horizontal plate (22) is fixedly installed on the end of the second spring (26) near the positioning sleeve (20). An extension rod (24) is fixedly installed on the side of the horizontal plate (22) near the second spring (26). A handle (25) is fixedly installed on the end of the extension rod (24) away from the positioning sleeve (20). A limiting horizontal bar (21) is fixedly installed on the center of the side of the horizontal plate (22) away from the handle (25). When the handle (25) is pulled, the limiting horizontal bar (21) can be moved out from the inside of the positioning sleeve (20), and the movable vertical frame (30) can be released.

2. The adjustable-height prefabricated composite floor slab according to claim 1, characterized in that: The extension device (13) includes a connecting crossbar (31) and a movable vertical frame (30). The movable vertical frame (30) is fixedly installed at both ends of the connecting crossbar (31). The steel reinforcement frame (29) is fixedly installed on the side end of the movable vertical frame (30) away from the connecting crossbar (31). The bottom end of the steel reinforcement frame (29) is fixedly installed with reinforcing rods (28) at equal intervals. When the movable vertical frame (30) moves inside the alignment sleeve (20), it can simultaneously drive the steel reinforcement frame (29) to move and lift.

3. The adjustable-height prefabricated composite floor slab according to claim 2, characterized in that: The fitting device (14) includes a precast floor slab (35) and a placement groove (32). The placement groove (32) is symmetrically opened at the top of the precast floor slab (35). The front and rear ends of the precast floor slab (35) are provided with storage grooves (34). The bottom right side of the precast floor slab (35) is fixedly installed with a fitting base frame (33). When the U-shaped bracket (8) is used in conjunction with the base frame (33), it can restrict the alignment of the two precast floor slabs (35).

4. The adjustable-height prefabricated composite floor slab according to claim 3, characterized in that: The second insert (6) is slidably inserted into the top of the connecting crossbar (31), the first insert (5) is slidably inserted into the handle (17), the U-shaped bracket (8) is fixedly installed on the side of the precast floor slab (35) away from the cooperating base frame (33), the movable vertical frame (30) is slidably inserted into the top of the alignment sleeve (20), the embedded part (27) is symmetrically fixedly installed inside the precast floor slab (35), the reinforcing rod (28) is slidably inserted into the top of the precast floor slab (35), the support sleeve (16) is fixedly installed in the center of the placement slot (32) near the storage slot (34), and the top and bottom of the displacement crossbar (18) are respectively attached to the top and bottom of the storage slot (34).

5. The adjustable-height prefabricated composite floor slab according to claim 4, characterized in that: The bottom end of the U-shaped bracket (8) is fixedly equipped with square keys at equal intervals, and the top end of the mating base frame (33) is provided with square grooves at equal intervals. The top end of the precast floor slab (35) near the mating base frame (33) is provided with a groove, and the top end of the precast floor slab (35) near the mating base frame (33) is provided with a slot.

6. The adjustable-height prefabricated composite floor slab according to claim 5, characterized in that: The movable vertical frame (30) has round holes equidistantly opened inside the steel bar frame (29) away from the steel bar frame (29). The top of the alignment key (9) is symmetrically fixed with a key. The top and bottom of the U-shaped bracket (8) are symmetrically opened with movable grooves. The bottom of the side end of the alignment key (9) away from the U-shaped bracket (8) is inclined at 45°.

7. The adjustable-height prefabricated composite floor slab according to claim 6, characterized in that: The displacement crossbar (18) has a threaded hole inside, the handle (17) has a through hole inside, the extension rod (24) slides through the support cavity (23) and is connected to the cross plate (22) at the end away from the alignment sleeve (20), and the placement groove (32) has an installation hole inside near the storage groove (34).

8. The adjustable-height prefabricated composite floor slab according to claim 7, characterized in that: The precast floor slab (35) also includes a pre-embedded bracket (36) and a limiting side frame (37). The pre-embedded bracket (36) is symmetrically fixedly installed inside the front and rear ends of the precast floor slab (35), and the limiting side frame (37) is fixedly installed on the pre-embedded bracket (36).

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