Large-span laminated slab bracing-free system and construction method thereof

Abstract

The application discloses a large-span laminated slab free-supporting system and a construction method thereof, and relates to the technical field of fabricated buildings.The application comprises a laminated bottom plate and a first supporting piece, the bottom of the laminated bottom plate is fixed with a plurality of strip-shaped plates, grooves are formed in the bottom of the strip-shaped plates, T-shaped grooves are formed in the top of the grooves, the first supporting piece is matched with the T-shaped grooves, protruding blocks are movably arranged in the grooves, limit plates are fixed to the bottom of the protruding blocks, the limit plates abut against the bottom surface of the strip-shaped plates, the first supporting piece is conveniently limited in the T-shaped grooves, the first supporting piece is used for being temporarily supported on the bottom of the laminated bottom plate and being installed on a main building structure, reinforcing supporting assemblies are arranged on the lower side of the protruding blocks, adjusting assemblies are arranged between the reinforcing supporting assemblies and the limit plates, the positions of the reinforcing supporting assemblies in the vertical direction and the angles of the reinforcing supporting assemblies in the horizontal direction are conveniently adjusted, the laminated bottom plate is further supported on the lower side, and the adjacent two laminated bottom plates are conveniently connected and the adjacent two laminated bottom plates are conveniently supported on the lower side of the joint formwork.

Description

Technical Field

[0001] This invention belongs to the field of prefabricated building technology, and in particular relates to a large-span composite slab support-free system and its construction method. Background Technology

[0002] Composite floor slabs are a type of structure that combines precast slabs and cast-in-place concrete and is widely used in construction. The precast prestressed thin slabs are combined with the upper cast-in-place concrete layer to form a composite whole and work together.

[0003] With the promotion of prefabricated buildings, composite slabs have also been developed into large-span slabs to suit the span of building floor slabs. However, these large-span slabs will generate bending moments due to their own weight during hoisting and installation, which can lead to cracking of the slab surface. Therefore, during assembly, full-span supports need to be set at the bottom to support the composite slabs and prevent damage during in-situ pouring, which greatly increases the construction cost. After the construction is completed, the full-span supports also need to be dismantled and recycled, which is time-consuming and labor-intensive, greatly increasing the workload of construction workers and affecting the construction progress and efficiency. In addition, supports also need to be set up for the joint formwork on the underside of adjacent composite slabs, making the assembly of composite slabs quite troublesome.

[0004] To address this issue, we designed a large-span composite slab support-free system and its construction method. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention relates to a large-span composite slab support-free system, comprising a composite base plate and a first support member. Several strip plates are fixed to the bottom of the composite base plate. The bottom of each strip plate has a groove, and the top of the groove has a T-shaped groove. The first support member mates with the T-shaped groove. A protrusion is movably disposed within the groove. A limiting plate is fixed to the bottom of the protrusion, and the limiting plate abuts against the bottom surface of the strip plate. A reinforcing support assembly is disposed below the limiting plate. An adjusting assembly is disposed between the reinforcing support assembly and the limiting plate. A locking structure is disposed on the protrusion. The reinforcing support assembly includes: A fixed plate, wherein a slot is provided on the side of the fixed plate away from the limiting plate, the slot has a T-shaped cross-section, and a plurality of first positioning screw holes are provided through the inner wall of the slot; The second support member has several second positioning screw holes through it. The second positioning screw holes correspond one-to-one with the first positioning screw holes and cooperate with each other. Positioning bolts are threaded between the second positioning screw holes and the first positioning screw holes on the same axis.

[0006] The adjustment assembly includes a movable ring, which is rotatably mounted on the top of the fixed plate. A screw is connected to the side of the movable ring away from the fixed plate. A threaded tube is rotatably connected to the bottom of the limiting plate. The screw is threaded into the inner wall of the threaded tube. Several telescopic rods are connected to the bottom of the limiting plate and the fixed plate.

[0007] The locking structure includes a fastening bolt, a tapered rod with a tapered cross-section fixed to the end of the fastening bolt away from the knob, a threaded portion fixed to the end of the tapered rod away from the fastening bolt, a cavity inside the protrusion, a through hole with a tapered cross-section through the top of the cavity, a screw hole with a threaded connection to the cavity on the limiting plate, the fastening bolt being threaded into the screw hole, a plurality of tapered holes with a tapered cross-section through the first support member, and a plurality of threaded grooves with a threaded groove on the top of the inner wall of the T-shaped groove.

[0008] The tapered rod engages with the through hole and the tapered hole, the threaded part engages with the threaded groove, and the threaded groove corresponds one-to-one with the tapered hole and is on the same axis.

[0009] The locking structure also includes wedge blocks, two of which are disposed opposite each other inside the cavity. The side of the two wedge blocks that are close to each other is an arc-shaped structure, and the arc-shaped structure is adapted to the outer contour of the tapered rod. Two movable plates are movably disposed inside the cavity. A connecting rod is fixed between the movable plates and the adjacent wedge blocks. A positioning block is fixed on the side of the movable plate away from the wedge blocks. Two circular holes are opened through the inner wall of the cavity. Several first positioning holes are opened opposite each other on the inner wall of the groove. The positioning blocks cooperate with the circular holes and the first positioning holes. A spring is connected between the side of the movable plate near the circular holes and the inner wall of the cavity. The spring is sleeved on the outside of the positioning block.

[0010] A number of reinforcing ribs are provided between the outer wall of the strip plate and the composite bottom plate. A second positioning hole is provided through the reinforcing rib, and the second positioning hole and the first positioning hole are on the same axis.

[0011] A construction method comprising the following steps: Step 1: First, insert the first support into the T-slot and simultaneously insert the protrusion into the groove. This causes the limiting plate to abut against the strip plate. The adjusting threaded part enters the cavity through the screw hole on the limiting plate, which in turn drives the tapered rod to move synchronously into the cavity until the fastening bolt is screwed into the screw hole. At this time, the tapered rod enters the tapered hole on the first support and the threaded part is simultaneously screwed into the thread groove. As the fastening bolt is screwed inward, the tapered rod moves synchronously into the tapered hole. During this process, the movement of the tapered rod pushes the two wedge-shaped blocks inside the cavity to both sides. Combined with the connecting rod and the movable plate, the spring is squeezed, which in turn drives the positioning block through the round hole and into the corresponding first positioning hole, thereby fixing the first support member in the T-groove. Step 2: Adjust the second support component to fit into the slot according to the actual construction situation, and fix the second support component in the slot using positioning bolts; Step 3: Rotate the threaded tube and adjust the screw to move up and down along the inner cavity of the threaded tube to adjust the distance between the second support and the first support. Step 4: When only the composite base slab needs to be supported, the composite base slab is hoisted to the construction position so that the first and second support members are erected on the main building structure and play a supporting role at the bottom of the composite base slab, and the composite base slab is poured. When it is necessary to connect adjacent composite base plates or to support the joint templates on the underside of two adjacent composite base plates, the fixed plate is adjusted to rotate under the rotation of the movable ring and the fixed plate, causing the second support inside the slot to rotate synchronously, so that the second support rotates 90°. Then, the composite base plate is hoisted to the construction position by means of hoisting. The first support is erected on the main building structure to provide support at the bottom of the composite base plate. At the same time, under the action of the second support on the underside of two adjacent composite base plates, the adjacent composite base plates are connected or the joint templates on the underside of two adjacent composite base plates are supported, and then the pouring operation is carried out.

[0012] The present invention has the following beneficial effects: This invention facilitates the erection of a first support member on the main building structure, forming a support at the bottom of the composite base slab. Simultaneously, positioning bolts allow for the easy fixing of a second support member within the slot, further supporting the bottom of the composite base slab. This eliminates the need for a full-span support structure, saving manpower and ensuring construction progress and efficiency. It solves the problems of existing composite slab systems that require a full-span support structure at the bottom during assembly to prevent damage during pouring, significantly increasing construction costs. Furthermore, the full-span support structure must be dismantled and recycled after construction, which is time-consuming, labor-intensive, increases the workload of construction workers, and negatively impacts construction progress and efficiency. The screw and the threaded tube are engaged to facilitate the adjustment of the screw's movement up and down along the inner cavity of the threaded tube. Combined with the telescopic characteristics of the telescopic rod, this drives the fixed plate to move up and down, thereby adjusting the distance between the second support and the first support. This adapts to different construction conditions. Simultaneously, the rotation of the movable ring and the fixed plate facilitates the adjustment of the fixed plate's rotation, which in turn drives the second support fixed inside the slot to rotate synchronously, adjusting the orientation of the second support. This facilitates the connection of adjacent composite base plates or the support of the joint templates on the underside of two adjacent composite base plates, improving the flexibility and effectiveness of the support. It solves the problem that existing composite plate assembly construction requires the construction of supports for the joint templates on the underside of adjacent composite plates, making the assembly construction of composite plates more complicated. Meanwhile, the locking structure facilitates fixing the protrusion in the groove and the first support in the T-slot, ensuring the stability of the bottom support of the stacked base plate.

[0013] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a front view of the present invention; Figure 3 for Figure 2 Schematic diagram of the structure of section AA; Figure 4 for Figure 3 Enlarged structural diagram at point B; Figure 5 for Figure 3 Enlarged structural diagram at point C; Figure 6 for Figure 4 Enlarged structural diagram at point D; Figure 7 This is a schematic diagram of the structure of the adjustment component in this invention; Figure 8 for Figure 7 A structural diagram from another perspective.

[0016] The attached diagram lists the components represented by each number as follows: 1. Overlapping base plate; 2. First support member; 3. Strip plate; 4. Groove; 5. T-slot; 6. Protrusion; 7. Limiting plate; 8. Fixing plate; 9. Slot; 10. First positioning screw hole; 11. Second positioning screw hole; 12. Positioning bolt; 13. Second support member; 14. Movable ring; 15. Threaded tube; 16. Screw; 17. Telescopic rod; 18. Fastening bolt; 19. Tapered rod; 20. Threaded part; 21. Tapered hole; 22. Threaded groove; 23. Cavity; 24. Wedge block; 25. Connecting rod; 26. Movable plate; 27. Positioning block; 28. First positioning hole; 29. ​​Spring; 30. Reinforcing rib; 31. Second positioning hole. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] In the description of this invention, it should be understood that the terms "upper," "middle," "outer," "inner," etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0019] Please see Figures 1-8 As shown, this invention is a large-span composite slab support-free system, including a composite base plate 1 and a first support member 2. Several strip plates 3 are fixed to the bottom of the composite base plate 1. Grooves 4 are formed at the bottom of the strip plates 3, and T-shaped grooves 5 are formed at the top of the grooves 4. The first support member 2 cooperates with the T-shaped grooves 5. A protrusion 6 is movably arranged within the grooves 4. A limiting plate 7 is fixed to the bottom of the protrusion 6, abutting against the bottom surface of the strip plates 3. A reinforcing support assembly is provided on the lower side of the limiting plate 7. An adjusting assembly is provided between the reinforcing support assembly and the limiting plate 7. A locking structure is provided on the protrusion 6. The reinforcing support assembly includes: The fixed plate 8 has a slot 9 on the side away from the limiting plate 7. The slot 9 has a T-shaped cross-section and several first positioning screw holes 10 are formed through the inner wall of the slot 9. The second support member 13 has several second positioning screw holes 11 through it. The second positioning screw holes 11 correspond one-to-one with the first positioning screw holes 10 and cooperate with each other. Positioning bolts 12 are threaded between the second positioning screw holes 11 and the first positioning screw holes 10 on the same axis.

[0020] In the above structure, the first support member 2 is easy to erect on the main building structure and form support at the bottom of the composite base plate 1. At the same time, the positioning bolt 12 makes it easy to fix the second support member 13 inside the slot 9, which further provides support at the bottom of the composite base plate 1. There is no need to build a full-span support, saving manpower and ensuring construction progress and efficiency.

[0021] The adjustment assembly includes a movable ring 14, which is rotatably mounted on the top of the fixed plate 8. A screw 16 is connected to the side of the movable ring 14 away from the fixed plate 8. A threaded tube 15 is rotatably connected to the bottom of the limiting plate 7. The screw 16 is threadedly engaged with the inner wall of the threaded tube 15. Several telescopic rods 17 are connected to the bottom of the limiting plate 7 and the fixed plate 8. Through the threaded engagement of the screw 16 and the threaded tube 15, it is easy to adjust the screw 16 to move up and down along the inner cavity of the threaded tube 15. Combined with the telescopic characteristics of the telescopic rods 17, it drives the fixed plate 8 to move up and down, thereby adjusting the distance between the second support member 13 and the first support member 2. This adapts to different construction conditions. At the same time, with the rotational engagement of the movable ring 14 and the fixed plate 8, it is easy to adjust the rotation of the fixed plate 8, which in turn drives the second support member 13 fixed inside the slot 9 to rotate synchronously, thereby adjusting the orientation of the second support member 13. This facilitates the connection of adjacent overlapping base plates 1 or the support of the splicing template on the lower side of two adjacent overlapping base plates 1, improving the flexibility and effectiveness of the support.

[0022] The locking structure includes a fastening bolt 18, with a tapered rod 19 of conical cross-section fixed to the end of the fastening bolt 18 away from the knob. A threaded portion 20 is fixed to the end of the tapered rod 19 away from the fastening bolt 18. A cavity 23 is formed inside the protrusion 6, with a through hole of conical cross-section at the top of the cavity 23. A screw hole is formed on the limiting plate 7, communicating with the cavity 23. The fastening bolt 18 is threaded into the screw hole. Several conical holes 21 of conical cross-section are formed through the first support member 2. The top of the inner wall of the T-groove 5 is... The device is provided with several threaded grooves 22. The tapered rod 19 is engaged with the through hole and the tapered hole 21. The threaded part 20 is threaded with the threaded groove 22. The threaded groove 22 corresponds one-to-one with the tapered hole 21 and is on the same axis. The fastening bolt 18 is screwed into the threaded hole on the limiting plate 7, which facilitates the tapered rod 19 to move upward into the tapered hole 21. At the same time, the threaded part 20 is screwed into the threaded groove 22, so as to fix the strip plate 3, the first support member 2, the protrusion 6 and the limiting plate 7 together, and ensure the stability of each component during the support process.

[0023] The locking structure also includes wedge blocks 24. Two wedge blocks 24 are arranged opposite each other inside the cavity 23. The side of the two wedge blocks 24 that is close to each other has an arc-shaped structure, and the arc-shaped structure is adapted to the outer contour of the tapered rod 19. Two movable plates 26 are movably arranged inside the cavity 23. A connecting rod 25 is fixed between the movable plate 26 and the adjacent wedge block 24. A positioning block 27 is fixed on the side of the movable plate 26 away from the wedge block 24. Two round holes are opened through the inner wall of the cavity 23. Several first positioning holes 28 are opened opposite each other on the inner wall of the groove 4. The positioning block 27 cooperates with the round holes and the first positioning holes 28. A spring 29 is connected between the side of the movable plate 26 close to the round hole and the inner wall of the cavity 23. The spring 29 is sleeved on the outside of the positioning block 27.

[0024] Several reinforcing ribs 30 are provided between the outer wall of the strip plate 3 and the stacked base plate 1 to ensure the stability of the strip plate 3. A second positioning hole 31 is provided through the reinforcing rib 30. The second positioning hole 31 and the first positioning hole 28 are on the same axis, which makes it easy to use bolts to be screwed in from the outside of the second positioning hole 31 until they are screwed into the first positioning hole 28, so as to fix the protrusion 6 inside the groove 4 and adapt to the fixed connection under different usage conditions.

[0025] A construction method comprising the following steps: Step 1: First, insert the first support member 2 into the T-groove 5, and at the same time insert the protrusion 6 into the groove 4, which causes the limiting plate 7 to abut against the strip plate 3. Adjust the threaded part 20 into the cavity 23 through the screw hole on the limiting plate 7, which in turn causes the tapered rod 19 to move synchronously into the cavity 23 until the fastening bolt 18 is screwed into the screw hole. At this time, the tapered rod 19 enters the tapered hole 21 on the first support member 2, and the threaded part 20 is simultaneously screwed into the threaded groove 22. As the fastening bolt 18 is screwed inward, the tapered rod 19 moves synchronously into the tapered hole 21. During this process, the movement of the tapered rod 19 pushes the two wedge blocks 24 inside the cavity 23 to both sides. Combined with the connecting rod 25 and the movable plate 26, the spring 29 is pushed, thereby driving the positioning block 27 through the round hole and into the corresponding first positioning hole 28, thus fixing the first support member 2 in the T-groove 5. Step 2: According to the actual construction situation, adjust the second support 13 to be inserted into the slot 9, and fix the second support 13 in the slot 9 with the positioning bolt 12; Step 3: Rotate the threaded tube 15 and adjust the screw 16 to move up and down along the inner cavity of the threaded tube 15 to adjust the distance between the second support member 13 and the first support member 2. Step 4: When only the composite base plate 1 needs to be supported, the composite base plate 1 is hoisted to the construction position, so that the first support member 2 and the second support member 13 are erected on the main building structure and play a supporting role at the bottom of the composite base plate 1, and the composite base plate 1 is poured. When it is necessary to connect adjacent composite base plates 1 or to support the joint templates on the underside of two adjacent composite base plates 1, the fixed plate 8 is adjusted to rotate under the rotational cooperation of the movable ring 14 and the fixed plate 8, which drives the second support member 13 inside the slot 9 to rotate synchronously, so that the second support member 13 rotates 90°. Then, the composite base plate 1 is hoisted to the construction position by means of hoisting. The first support member 2 is erected on the main building structure to provide support at the bottom of the composite base plate 1. At the same time, under the action of the second support member 13 on the underside of two adjacent composite base plates 1, the adjacent composite base plates 1 are connected or the joint templates on the underside of two adjacent composite base plates 1 are supported, and then the pouring operation is carried out. Example

[0026] During the assembly of the composite plate, the first support 2 is first inserted into the T-groove 5, and the protrusion 6 is inserted into the groove 4. This causes the limiting plate 7 to abut against the strip plate 3. The adjusting threaded part 20 enters the cavity 23 through the screw hole on the limiting plate 7, which in turn causes the tapered rod 19 to move synchronously into the cavity 23 until the fastening bolt 18 is screwed into the screw hole. At this time, the tapered rod 19 enters the tapered hole 21 on the first support 2. The fastening bolt 18 is continuously rotated, which causes the tapered rod 19 to move synchronously into the tapered hole 21. At the same time, the threaded part 20 is screwed synchronously into the threaded groove 22 until the threaded part 20 is screwed into the bottom of the threaded groove 22. During this process, through the conical structure of the conical rod 19, as the conical rod 19 moves, the two wedge-shaped blocks 24 inside the cavity 23 are squeezed to both sides, which drives the connecting rod 25 and the movable plate 26 to squeeze the spring 29, thereby driving the positioning block 27 to pass through the round hole and insert into the corresponding first positioning hole 28, so that the protrusion 6 is fixed inside the groove 4, further ensuring the stability of fixing the first support 2 in the T-shaped groove 5; Next, adjust the second support member 13 to be inserted into the slot 9, and fix the second support member 13 in the slot 9 by the positioning bolt 12. At the same time, rotate the threaded tube 15, and adjust the screw 16 to move up and down along the inner cavity of the threaded tube 15. Combined with the telescopic rod 17, it drives the fixed plate 8 to move up and down relative to the limiting plate 7, so as to adjust the distance between the second support member 13 and the first support member 2. When only the composite base plate 1 needs to be supported, the composite base plate 1 is hoisted to the construction position, and the first support member 2 and the second support member 13 are erected on the main building structure to provide support at the bottom of the composite base plate 1, and the composite base plate 1 is then poured. During the assembly process, depending on the actual construction situation, the bottom of the composite base plate 1 can be supported by the first support member 2 alone, or by using the first support member 2 in conjunction with the second support member 13 to support the bottom of the composite base plate 1. When it is necessary to connect adjacent composite base plates 1 or to support the joint template on the underside of two adjacent composite base plates 1, the fixed plate 8 is adjusted to rotate under the rotational cooperation of the movable ring 14 and the fixed plate 8, which drives the second support member 13 inside the slot 9 to rotate synchronously, so that the second support member 13 rotates 90°. Then, the composite base plate 1 is hoisted to the construction position by means of hoisting. The first support member 2 is erected on the main building structure to support the bottom of the composite base plate 1. At the same time, under the action of the second support member 13 on the underside of two adjacent composite base plates 1, the adjacent composite base plates 1 are connected or the joint template on the underside of two adjacent composite base plates 1 is supported. Then, the pouring operation is carried out. The height of the fixed plate 8 relative to the limiting plate 7 is adjusted by the cooperation of the threaded pipe 15 and the screw 16. Combined with the rotation of the movable ring 14 and the fixed plate 8, multiple second support members 13 can be installed. According to the actual situation, the orientation of the multiple second support members 13 can be adjusted to support the composite base plate 1 while also supporting the splicing template on the lower side of the two adjacent composite base plates 1. There is no need to build a full-span support, saving manpower and material resources, and ensuring construction progress and efficiency.

[0027] It should be further noted that the installation structure, connection method, or setting method of each component in this invention are all common mechanical methods, and any method that can achieve its beneficial effect can be implemented.

[0028] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0029] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A large-span composite slab support-free system, comprising a composite base plate (1) and a first support member (2), characterized in that, The bottom of the composite base plate (1) is fixed with several strip plates (3). The bottom of the strip plates (3) is provided with a groove (4). The top of the groove (4) is provided with a T-shaped groove (5). The first support member (2) cooperates with the T-shaped groove (5). A protrusion (6) is movably arranged in the groove (4). A limit plate (7) is fixed at the bottom of the protrusion (6). The limit plate (7) abuts against the bottom surface of the strip plate (3). A reinforcing support assembly is provided on the lower side of the limit plate (7). An adjustment assembly is provided between the reinforcing support assembly and the limit plate (7). A locking structure is provided on the protrusion (6). The reinforcing support assembly includes: The fixed plate (8) has a slot (9) on the side away from the limiting plate (7). The slot (9) has a T-shaped cross-section and a plurality of first positioning screw holes (10) are provided through the inner wall of the slot (9). The second support member (13) has several second positioning screw holes (11) through it. The second positioning screw holes (11) correspond one-to-one with the first positioning screw holes (10) and cooperate with each other. The second positioning screw holes (11) and the first positioning screw holes (10) on the same axis are threaded with positioning bolts (12). The locking structure includes a fastening bolt (18), and a tapered rod (19) with a tapered cross-section is fixed to one end of the fastening bolt (18) away from the knob. A threaded part (20) is fixed to one end of the tapered rod (19) away from the fastening bolt (18). A cavity (23) is provided inside the protrusion (6). A through hole with a tapered cross-section is provided through the top of the cavity (23). A screw hole is provided on the limiting plate (7). The screw hole is connected to the cavity (23). The fastening bolt (18) is threadedly engaged with the screw hole. Several tapered holes (21) with a tapered cross-section are provided through the first support member (2). Several threaded grooves (22) are provided on the top of the inner wall of the T-groove (5).

2. The large-span composite slab support-free system according to claim 1, characterized in that, The adjustment assembly includes a movable ring (14), which is rotatably mounted on the top of the fixed plate (8). A screw (16) is connected to the side of the movable ring (14) away from the fixed plate (8). A threaded tube (15) is rotatably connected to the bottom of the limiting plate (7). The screw (16) is threaded into the inner wall of the threaded tube (15). Several telescopic rods (17) are connected to the bottom of the limiting plate (7) and the fixed plate (8).

3. The large-span composite slab support-free system according to claim 1, characterized in that, The tapered rod (19) is engaged with the through hole and the tapered hole (21), the threaded part (20) is engaged with the threaded groove (22), the threaded groove (22) corresponds to the tapered hole (21) one by one, and is on the same axis.

4. The large-span composite slab support-free system according to claim 3, characterized in that, The locking structure also includes a wedge block (24), two wedge blocks (24) are arranged opposite each other inside the cavity (23), the side of the two wedge blocks (24) that is close to each other is an arc structure, and the arc structure is adapted to the outer wall contour of the tapered rod (19). Two movable plates (26) are movably arranged inside the cavity (23). A connecting rod (25) is fixed between the movable plate (26) and the adjacent wedge block (24). A positioning block (27) is fixed on the side of the movable plate (26) away from the wedge block (24). Two round holes are opened through the inner wall of the cavity (23). Several first positioning holes (28) are opened opposite each other on the inner wall of the groove (4). The positioning block (27) cooperates with the round holes and the first positioning holes (28). A spring (29) is connected between the side of the movable plate (26) close to the round hole and the inner wall of the cavity (23). The spring (29) is sleeved on the outside of the positioning block (27).

5. The large-span composite slab support-free system according to claim 4, characterized in that, A number of reinforcing ribs (30) are provided between the outer wall of the strip plate (3) and the composite bottom plate (1). A second positioning hole (31) is provided through the reinforcing rib (30), and the second positioning hole (31) and the first positioning hole (28) are on the same axis.

6. A construction method for a large-span composite slab support-free system according to claim 5, characterized in that, Includes the following steps: Step 1: First, insert the first support member (2) into the T-groove (5), and at the same time insert the protrusion (6) into the groove (4), which causes the limiting plate (7) to abut against the strip plate (3). Adjust the threaded part (20) through the screw hole on the limiting plate (7) into the cavity (23), which in turn causes the tapered rod (19) to move synchronously into the cavity (23) until the fastening bolt (18) is screwed into the screw hole. At this time, the tapered rod (19) enters the tapered hole (21) on the first support member (2), and the threaded part (20) is screwed into the threaded groove (22) simultaneously. As the fastening bolt (18) is screwed inward, the tapered rod (19) moves synchronously into the tapered hole (21). During this process, the movement of the tapered rod (19) pushes the two wedge blocks (24) inside the cavity (23) to both sides. Combined with the connecting rod (25) and the movable plate (26), the spring (29) is squeezed, which in turn drives the positioning block (27) through the round hole and into the corresponding first positioning hole (28), thereby fixing the first support member (2) in the T-groove (5). Step 2: According to the actual construction situation, adjust the second support (13) to be inserted into the slot (9), and fix the second support (13) in the slot (9) by the positioning bolt (12); Step 3: Rotate the threaded tube (15) and adjust the screw (16) to move up and down along the inner cavity of the threaded tube (15) to adjust the distance between the second support (13) and the first support (2); Step 4: When only the composite base plate (1) needs to be supported, the composite base plate (1) is hoisted to the construction position so that the first support member (2) and the second support member (13) are erected on the main building structure and play a supporting role at the bottom of the composite base plate (1) and the composite base plate (1) is poured. When it is necessary to connect adjacent composite base plates (1) or to support the joint template on the lower side of two adjacent composite base plates (1), the fixed plate (8) is adjusted to rotate under the rotation of the movable ring (14) and the fixed plate (8), which drives the second support member (13) inside the slot (9) to rotate synchronously, so that the second support member (13) rotates 90°. Then, the composite base plate (1) is hoisted to the construction position by means of hoisting. The first support member (2) is erected on the main structure of the building to support the bottom of the composite base plate (1). At the same time, under the action of the second support member (13) on the lower side of two adjacent composite base plates (1), the adjacent composite base plates (1) are connected or the joint template on the lower side of two adjacent composite base plates (1) is supported. Then, the pouring operation is carried out.

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