A support-free prestressed composite slab connecting joint

Abstract

The application discloses a kind of pre-stressed composite board connecting nodes of free support, it is used to connect beam body and composite board, steel pipe truss is arranged on the composite board, comprising: support rod, it is liftable and is arranged on beam body, and its upper end is provided with the support piece of steel pipe truss support;Fixed height component, it is used to adjust the height of support rod;Trigger component, it triggers fixed height component locking to fix the height of support rod.The application is by being provided with support rod and support piece, by the support piece and lift steel pipe truss on composite board, in combination with the height adjustment of fixed height component to support rod, in the hoisting process of composite board, when it is moved to the surface of beam body and is adhered, can make trigger component trigger to lock fixed height component, then the height of support rod is fixed, to realize stable support steel pipe truss, that is, support composite board at accurate height, thereby need not be set up support structure at the bottom of composite board, promote to realize multilayer composite board synchronous construction.

Description

Technical Field

[0001] This invention relates to the field of prefabricated building technology, and specifically to a support-free prestressed composite slab connection node. Background Technology

[0002] Prestressed concrete steel pipe truss composite slabs are a structural form combining prefabricated floor slabs and cast-in-place floor slabs. The bottom uses precast concrete thin slabs as permanent formwork, and the upper part is a cast-in-place concrete composite layer. In existing technologies, when hoisting prestressed concrete steel pipe truss composite slabs, a supporting structure must be pre-installed at the bottom. Existing supporting structures are usually in the form of scaffolding. Before installation, measurement and marking are required. During use, the supporting structure is placed at the predetermined point, and then support beams are placed on top of multiple supporting structures. The prestressed concrete steel pipe truss composite slab is then placed on the supporting structure, supported by multiple support beams, before the next step of concrete pouring. After the concrete has solidified, the supporting structure is dismantled.

[0003] Patent document CN115370188A, published on November 22, 2022, discloses a support device for prestressed concrete steel pipe truss composite slabs. The technical solution includes a bottom positioning mechanism and a support mechanism. The bottom positioning mechanism includes fixed seats and positioning rods. Positioning rods are inserted around the fixed seats, and a magnetic seat is fixedly installed at the bottom of the fixed seats. Several fixed seats and several positioning rods are arranged in a grid pattern. Its advantages are: effectively avoiding the disappearance or inaccuracy of positioning lines; easy installation and disassembly; high support strength; convenient carrying after disassembly; and increased stability of the support mechanism. A lifting component is provided, which adopts a worm gear structure for easy height adjustment and self-locking.

[0004] However, the existing technology of the aforementioned patent has improved the existing support structure, but it still cannot be separated from the direct support of the composite slab. Moreover, due to the large setting range, the construction is often cumbersome and requires construction layer by layer. Therefore, there is an urgent need for a support-free prestressed composite slab connection node to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a support-free prestressed composite slab connection node to overcome the above-mentioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A supportless prestressed composite slab connection node is used to connect a beam and a composite slab. The composite slab is provided with a steel pipe truss, comprising: a support rod that is liftably mounted on the beam and has a support member at its upper end supporting the steel pipe truss; a height-fixing component for adjusting the height of the support rod; and a triggering component that, when the composite slab is hoisted and lowered to fit against the upper surface of the beam, triggers the height-fixing component to lock and fix the height of the support rod.

[0008] Preferably, a first compartment is fixedly installed on the beam, and a second compartment is installed on each of the two opposite sides of the first compartment. The support rod is movably installed through the first compartment, the height-fixing component is installed in the first compartment and connected to the support rod, and the triggering component is installed in the second compartment.

[0009] Preferably, the lower end of the first compartment is provided with a cylinder, a guide rod is fixedly provided inside the cylinder, and the lower end of the support rod extends into the cylinder and is provided with a guide groove that matches the guide rod.

[0010] Preferably, the height-fixing component includes a toothed ring rotatably disposed within a first compartment, the toothed ring being sleeved on a support rod and its rotation being linked to the lifting and lowering of the support rod, and a plate elastically movably disposed within the first compartment, the plate being provided with limiting teeth that mesh with the toothed ring.

[0011] Preferably, the outer wall of the support rod is provided with a spiral groove, and the inner wall of the toothed ring is movably provided with a ball bearing, which is movably connected to the spiral groove.

[0012] Preferably, the triggering component includes a trigger element rotatably disposed within the second compartment. The trigger element has a first state in which its free end extends out of the upper surface of the beam and a second state in which its free end is flush with the upper surface of the beam. In the second state of the trigger element, the plate is positioned close to the toothed ring.

[0013] Preferably, the side of the plate away from the toothed ring is connected to a movable plate via an elastic element, and a sliding element is movably connected between the first chamber and the second chamber. One end of the sliding element is linked to the rotation of the trigger element, while the other end is linked to the movement of the movable plate. In the second state of the trigger element, the sliding element drives the movable plate to stay close to the plate to squeeze the elastic element.

[0014] Preferably, a sleeve connects the first compartment and the second compartment, and the sliding member slides through the sleeve.

[0015] Preferably, a lever plate that is rotatably disposed inside the second chamber and is linked to the sliding member is disposed in contact with the end of the overlapping plate in the second state of the trigger member.

[0016] Preferably, the inner wall of the second compartment is provided with a groove that matches the sliding member, and the lever is disposed in contact with the inner wall of the second compartment.

[0017] In the above technical solution, the beneficial effects of the present invention are:

[0018] This supportless prestressed composite slab connection node uses support rods and support members to support the steel pipe truss on the composite slab. Combined with the height adjustment of the support rods by the height-fixing component, during the hoisting of the composite slab, when it moves down to fit the upper surface of the beam, the triggering component can be activated to lock the height-fixing component, thus fixing the height of the support rod. This achieves stable support for the steel pipe truss, that is, it supports the composite slab at the accurate height. Therefore, there is no need to build a support structure at the bottom of the composite slab, which promotes the synchronous construction of multiple composite slabs.

[0019] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this disclosure.

[0020] This application provides an overview of various implementations or examples of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0022] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0023] Figure 2 This is a frontal cross-sectional structural schematic diagram provided for an embodiment of the present invention;

[0024] Figure 3 Provided for embodiments of the present invention Figure 2 Enlarged structural diagram at point A;

[0025] Figure 4 Provided for embodiments of the present invention Figure 2 Enlarged structural diagram at point B;

[0026] Figure 5 This is a schematic diagram of the internal structure provided in an embodiment of the present invention;

[0027] Figure 6 Provided for embodiments of the present invention Figure 5 A magnified structural diagram at point C.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Beam; 2. Composite slab; 3. Steel pipe truss; 4. Support rod; 5. Support component; 6. First compartment; 7. Second compartment; 8. Cylinder; 9. Guide rod; 10. Guide groove; 11. Toothed ring; 12. Plate; 13. Limiting tooth; 14. Spiral groove; 15. Ball bearing; 16. Trigger; 17. Elastic component; 18. Hatch plate; 19. Sliding component; 20. Sleeve; 21. Paddle plate; 23. Linkage component; 24. Linkage rod; 25. Ring; 26. Sliding groove; 27. Push-pull rod; 28. Push-pull groove. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0031] Please see Figure 1-6 This invention provides a supportless prestressed composite slab connection node for connecting a beam 1 and a composite slab 2. A steel pipe truss 3 is provided on the composite slab 2, including: a support rod 4, which is liftably mounted on the beam 1, and a support member 5 supporting the steel pipe truss 3 is provided at its upper end; a height-fixing component for adjusting the height of the support rod 4; and a triggering component that, when the composite slab 2 is hoisted and lowered to fit the upper surface of the beam 1, triggers the height-fixing component to lock and fix the height of the support rod 4.

[0032] Specifically, both beam 1 and composite slab 2 are horizontally arranged. Composite slab 2 is moved to the upper part of the installation position by a hoisting structure and then lowered for installation. Composite slab 2 is a reinforced concrete structure with prestressed steel bars inside. The direction of the prestressed steel bars is perpendicular to the beam 1 used as support points on both sides. Preferably, there are 2-4 steel pipe trusses 3. The steel pipe truss 3 includes steel pipes and steel reinforcement frames. The steel reinforcement frames support the steel pipes and are suspended parallel above composite slab 2. The direction of the steel pipes is also perpendicular to the beam 1 used as support points on both sides, and the length of the steel pipes exceeds the surface range of composite slab 2, that is, the ends of the steel pipes can be placed on composite slab 2. During installation, it extends above beam 1; support rods 4 are vertically positioned at the center line of the upper surface of beam 1, and preferably the number and spacing are the same as those of steel pipe trusses 3; support members 5 are preferably semi-sleeved, and can be in the shape of a "C" or "U", with the axial direction consistent with the steel pipe, and can be used to support the steel pipe trusses 3 on both sides; the height-fixing component can stabilize the height of the support rods 4 when they are not under stress, and does not restrict the lifting and lowering movement of the support rods 4 when they are under stress; the triggering component can lock the passive height-limiting function of the height-fixing component on the support rods 4, thus maintaining the height of the support rods 4. In practical use, the support rod 4 carries the support component 5 to a high position. The composite slab 2 moves above the beam 1 under the action of the hoisting equipment, aligning the steel pipe truss 3 with the support component 5. Then, under the action of the hoisting equipment, the composite slab 2 slowly descends, and the steel pipe truss 3 also slowly lands on the support component 5. At this time, the height-fixing component maintains its function of passively limiting the height of the support rod 4. Thus, under the weight of the composite slab 2 as a whole, the height of the support rod 4 decreases accordingly. When the composite slab 2 moves down to fit against the upper surface of the beam 1, the triggering component is activated to lock the height-fixing component, fixing the height of the support rod 4. The hoisting structure can then be disassembled from the composite slab 2, thereby achieving stable support for the steel pipe truss 3, i.e., supporting the composite slab 2 at an accurate height. This eliminates the need to erect a support structure at the bottom of the composite slab 2, promoting simultaneous construction of multiple composite slabs 2. In addition, the automatic adjustment and locking of the height of the support rod 4 eliminates manual operation and improves construction efficiency.

[0033] Compared with the prior art, the supportless prestressed composite slab connection node proposed in this embodiment of the invention uses support rods 4 and support members 5. The support members 5 support the steel pipe truss 3 on the composite slab 2. Combined with the height adjustment of the support rods 4 by the height fixing component, when the composite slab 2 moves down to the upper surface of the beam 1 during hoisting, the triggering component can be triggered to lock the height fixing component, thus fixing the height of the support rods 4. This can achieve stable support of the steel pipe truss 3, that is, support the composite slab 2 at the accurate height. Therefore, it is not necessary to build a support structure at the bottom of the composite slab 2, which promotes the synchronous construction of multiple composite slabs 2.

[0034] As a preferred technical solution in this embodiment, a first compartment 6 is fixedly installed on the beam 1, and a second compartment 7 is installed on both opposite sides of the first compartment 6. A support rod 4 is movably installed through the first compartment 6. A height-fixing component is installed inside the first compartment 6 and connected to the support rod 4. A triggering component is installed inside the second compartment 7. Specifically, the beam 1 is a precast component, and both the first compartment 6 and the second compartment 7 are pre-embedded in the concrete structure of the beam 1. The height of the upper surface of the second compartment 7 does not exceed the upper surface of the beam 1. The second compartment 7 is connected to the side wall of the beam 1. The support rod 4 is movably installed through the center of the first compartment 6. The triggering component inside the second compartment 7 can correspond to the lower part of the composite plate 2 during the hoisting process.

[0035] As a preferred technical solution in this embodiment, a cylinder 8 is provided at the lower end of the first compartment 6, and a guide rod 9 is fixedly provided inside the cylinder 8. The lower end of the support rod 4 extends into the cylinder 8 and is provided with a guide groove 10 that matches the guide rod 9. Specifically, the cylinder 8 is embedded in the beam 1 along with the first compartment 6; the guide rod 9 is set as a regular polygonal rod, and the guide rod 9 is slidably connected to the guide groove 10, so that the support rod 4 only moves up and down without rotating.

[0036] As a preferred embodiment, the height-fixing component includes a toothed ring 11 rotatably disposed within the first chamber 6. The toothed ring 11 is sleeved on the support rod 4, and its rotation is linked to the lifting and lowering of the support rod 4. A plate 12 is elastically and movably disposed within the first chamber 6, and the plate 12 is provided with limiting teeth 13 that mesh with the toothed ring 11. Specifically, the toothed ring 11 is only rotatably disposed within the first chamber 6. The support rod 4 is preferably cylindrical and coaxially disposed with the toothed ring 11. The lifting and lowering movement of the support rod 4 can be linked to the rotation of the toothed ring 11, that is, a helical feeding action can be formed between the support rod 4 and the toothed ring 11. The plate 12 can be moved closer to or away from the toothed ring 11 within the first chamber 6. Horizontal movement; the elastic force on the plate 12 forces the plate 12 to remain close to the toothed ring 11. When the toothed ring 11 rotates, that is, during the process of the support rod 4 being raised and lowered by external force, the toothed ring 11 and the limiting tooth 13 are squeezed together, causing the teeth on the toothed ring 11 to pass through the limiting tooth 13 one by one. This pushes the plate 12 away from and closer to the toothed ring 11 again and again. When the support rod 4 is not subjected to external force, its own weight cannot cause the toothed ring 11 to rotate to squeeze through the limiting tooth 13. In other words, the elasticity of the plate 12 forces the limiting tooth 13 to engage with the toothed ring 11, thereby hindering the rotation of the toothed ring 11. This allows the support rod 4, which is not subjected to external force, to maintain its current height.

[0037] As a further preferred technical solution of this embodiment, the outer wall of the support rod 4 is provided with a spiral groove 14, and the inner wall of the toothed ring 11 is movably provided with a ball 15. The ball 15 is movably connected to the spiral groove 14. Specifically, there are preferably two spiral grooves 14, which are symmetrically arranged in a circle. The ball 15 is matched with the spiral groove 14 one by one. The arrangement of the two sets of spiral grooves 14 and ball 15 makes the transmission between the support rod 4 and the toothed ring 11 smooth and flexible. The inner wall of the toothed ring 11 is provided with a hemispherical groove, and the ball 15 is spherical. Part of it is embedded in the hemispherical groove, and the other part slides in the spiral groove 14. The ratio of the pitch of the spiral groove 14 to the diameter of the cylindrical surface it is located in is satisfied. The lifting and lowering of the support rod 4 can force the toothed ring 11 to rotate through the spiral groove 14 and the ball 15. In actual use, the lifting and lowering movement of the support rod 4 causes the spiral groove 14 to rise and fall, and the ball 15 moves relative to the spiral groove 14. Since the spiral groove 14 only moves up and down, it forces the ball 15 to drive the toothed ring 11 to rotate in the first chamber 6. When the toothed ring 11 does not rotate, the ball 15 and the spiral groove 14 are relatively stationary, which limits the support rod 4 to maintain its height.

[0038] As a preferred technical solution in this embodiment, the triggering component includes a trigger 16 rotatably disposed within the second compartment 7. During its rotational stroke, the trigger 16 has a first state where its free end extends beyond the upper surface of the beam 1 and a second state where its free end is flush with the upper surface of the beam 1. In the second state of the trigger 16, the abutment plate 12 is positioned close to the toothed ring 11. Specifically, the upper end face of the second compartment 7 and the side end face of the connecting beam 1 are both open. The trigger 16 is plate-shaped, with its lower end hinged within the second compartment 7 and positioned near the open side end face. The upper end of the trigger 16 rotates outward from the second compartment 7. The upper end of the trigger 16 has a bent portion outward from the second compartment 7. This bent portion allows the trigger 16 in the first state to automatically rotate outward from the second compartment 7 when it begins to be pressed down by the overlapping plate 2, thus smoothly switching to the second state. The first state of the trigger 16 is when it remains upright. In the first state, the trigger 16 extends beyond the upper surface of the beam 1. During the lowering of the composite plate 2, the trigger 16 in the first state can be pressed down by the composite plate 2. In the second state, the trigger 16 rotates and tilts outward to a certain angle towards the second compartment 7. At this time, the highest point of the trigger 16 is flush with the upper surface of the beam 1, which means that a small part of the composite plate 2 overlaps with the beam 1. It should be noted that the overlap width of this part of the composite plate 2 on the beam 1 is set to 10-20mm and cannot be used as a main support node. In the second state of the trigger 16, the linkage plate 12 is limited to a position close to the toothed ring 11, which maintains the restriction on the rotation of the toothed ring 11 and locks the height of the support rod 4. When the trigger 16 is not in the second state, the linkage plate 12 is not limited to a position close to the toothed ring 11. That is, the linkage plate 12 can still float elastically away from the toothed ring 11, and will not maintain the restriction on the rotation of the toothed ring 11. The height of the support rod 4 can still be freely adjusted. Furthermore, the trigger 16 in the second state is inclined outward from the second compartment 7, that is, it extends outward from the side wall of the beam 1, and can be supported under the composite plate 2 to prevent the composite plate 2 from accidentally falling due to insufficient width of the upper surface of the beam 1.

[0039] As a further preferred technical solution of this embodiment, the side of the plate 12 away from the toothed ring 11 is connected to a hinged plate 18 via an elastic element 17. A sliding element 19 is movably connected between the first chamber 6 and the second chamber 7. One end of the sliding element 19 is linked to the rotation of the trigger element 16, while the other end is linked to the movement of the hinged plate 18. In the second state of the trigger element 16, the sliding element 19 drives the hinged plate 18 to stay close to the plate 12 to compress the elastic element 17. Specifically, the hinged plate 18 and the plate 12 are parallel to each other, and the elastic element 17 is disposed between the plate 12 and the hinged plate 18 to prevent the plate 12 and the hinged plate 18 from getting close to each other. The elastic element 17 can preferably be a spring. The movement of the sliding element 19 is linked to the rotation of the trigger element 16, and is also linked to the movement of the hinged plate 18, thus realizing the contact... The rotation of the trigger 16 is linked to the movement of the flap 18. Preferably, a linkage 23 is rotatably provided inside the first compartment 6. The rotation position of the linkage 23 is set in the middle. Both ends of the linkage 23 are provided with linkage rods 24. The flap 18 is provided with a ring 25 that is sleeved with the linkage rod 24 on the side away from the elastic member 17. The sliding member 19 is provided with a sliding groove 26 that matches the linkage rod 24. The rotation of the linkage 23 causes the flap 18 and the sliding member 19 to move closer or further apart through the linkage rod 24. The sliding member 19 is provided with a push-pull rod 27. The trigger 16 is provided with a push-pull groove 28 that is movably connected to the push-pull rod 27. The horizontal movement of the sliding member 19 causes the push-pull rod 27 to move relatively within the push-pull groove 28, thereby causing the trigger 16 to rotate.

[0040] The following details the switching process between the first and second states of the trigger 16: First, before the composite plate 2 is hoisted and installed, the support rod 4 is pulled up, causing the support rod 4 to carry the support member 5 to a high position, and this position is maintained under the action of the height-fixing component. The trigger 16 is not pressed down. Then, under the action of the elastic member 17 pushing the plate 12 and the flap 18 away from each other, the sliding member 19 is kept close to the flap 18 by the linkage of the linkage member 23 and the linkage rod 24. Thus, the other end of the sliding member 19 drives the trigger 16 to remain in the first state through the push-pull rod 27 and the push-pull groove 28. Next, the composite plate 2 is moved above the beam 1 by the hoisting equipment, and the steel pipe truss 3 and the support member 5 are aligned one by one. Then, the composite plate 2 is slowly lowered by the hoisting equipment, and the steel pipe truss 3 is also slowly placed on the support member 5. At this time, since the trigger member 16 is in the first state, the height-fixing component maintains the function of passively limiting the height of the support rod 4. Therefore, under the pressure of the gravity of the composite plate 2, the height of the support rod 4 is lowered accordingly. The support rod 4 drives the spiral groove 14 to descend. The spiral groove 14 and the ball 15 have a spiral feeding action, which drives the toothed ring 11 to rotate. Since the plate 12 and the movable plate 18 are kept far apart at this time, the elastic member 17 has sufficient compression space. Therefore, the rotation of the toothed ring 11 causes its upper teeth to squeeze through the limiting teeth 13 one by one, that is, the support rod 4 moves down smoothly. When the stacked plate 2 moves down to a certain height and begins to press down the trigger 16 in the first state, it forces the trigger 16 to rotate outward from the second compartment 7, that is, the trigger 16 switches from the first state to the second state. At this time, the rotation of the trigger 16 drives the sliding member 19 away from the flap 18 through the push-pull rod 27 and the push-pull groove 28. Then, under the action of the linkage 23 and the linkage rod 24, the flap 18 and the sliding member 19 move away from each other. The flap 18 then moves closer to the plate 12 to squeeze the elastic member 17. As a result, the compressible range of the elastic member 17 gradually decreases. When the composite plate 2 moves down to the upper surface of the beam 1, the trigger 16 switches to the second state under the pressure of the composite plate 2. At this time, according to the above process, the elastic element 17 is forced to compress to the maximum degree, and the plate 12 is restricted to the position of the toothed ring 11. The rotation of the toothed ring 11 is completely restricted, and the spiral groove 14 and the ball 15 can no longer perform the spiral feeding action. That is, the height of the support rod 4 is locked. At this time, the hoisting structure can be disassembled and removed from the composite plate 2. The support rod 4 can stably support the steel pipe truss 3 at the accurate height without the need to build a support structure at the bottom of the composite plate 2, which promotes the synchronous construction of multiple composite plates 2. In addition, the height of the support rod 4 is automatically adjusted and locked, eliminating manual operation and thus improving construction efficiency.

[0041] As a further preferred technical solution in this embodiment, a sleeve 20 is connected between the first compartment 6 and the second compartment 7. The sliding member 19 is slidably installed through the sleeve 20. Specifically, the sleeve 20 connects the first compartment 6 and the second compartment 7 to form an integral whole, and is embedded together in the concrete solid of the beam 1 to ensure that the first compartment 6, the second compartment 7 and the sleeve 20 form an independent space for the internal parts to move.

[0042] In another embodiment of the present invention, a lever 21, which is rotatably disposed inside the second compartment 7 and is linked to the sliding member 19, is disposed in contact with the end of the stacked plate 2 in the second state of the trigger member 16. Specifically, in the first state of the trigger member 16, the lever 21 is in a preparatory position for tilting towards the inside of the second compartment 7. In the second state of the trigger member 16, the lever 21 is erected upward to contact the end of the stacked plate 2. The lever 21 and the sliding member 19 are also linked by the push-pull rod 27 and the push-pull groove 28. The movement of the sliding member 19 away from the flap 18 can cause the lever 21 to be erected to contact the end of the stacked plate 2. The movement of the sliding member 19 towards the flap 18 causes the lever 21 to tilt towards the inside of the second compartment 7 to be in the preparatory position. In practical use, when the composite slab 2 is hoisted to the upper surface of the beams 1 on both sides, a certain width must be left at the end to form an overlap. This width is usually narrow, so repeated checks are required during the hoisting and lowering of the composite slab 2, which brings installation trouble. To address this, the lever 21 is designed so that during the lowering of the composite slab 2 and the pressing of the trigger 16, it can drive the sliding member 19 to move. The sliding member 19 can then drive the lever 21 to rotate from the preparatory position to the upright position. Thus, when there is When the overlap width between the composite slab 2 on one side and the side of the beam 1 is larger, that is, when the overlap width on the other side is smaller, the lever 21 in the process of switching to the upright state can push the composite slab 2 laterally. Thus, under the synchronous action of the levers 21 on both sides, it is ensured that when the composite slab 2 finally adheres to the upper surface of the beam 1, the overlap width with the beam 1 on both sides is uniform and appropriate. Since the composite slab 2 is in a suspended state, the force required for the lever 21 to push the composite slab 2 laterally is usually small, so the above structure can meet the requirements.

[0043] As a preferred technical solution in this embodiment, the inner wall of the second compartment 7 is provided with a groove that matches the sliding member 19. The lever 21 is set to fit against the inner wall of the second compartment 7. Specifically, the sliding member 19 is forked at one end connecting the trigger member 16 and the lever 21. This end of the trigger member 16 is slidably connected in the groove to avoid protruding into the second compartment 7, thereby satisfying the setting of the lever 21 to fit against the inner wall of the second compartment 7. Thus, when the lever 21 is erected to fit against the end of the composite plate 2, the lever 21 also isolates the internal space of the second compartment 7. Therefore, the subsequent concrete pouring on the upper side of the beam 1 will not leak due to the setting of the second compartment 7, ensuring the airtightness of the structure.

[0044] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A supportless prestressed composite slab connection node for connecting a beam (1) and a composite slab (2), wherein a steel pipe truss (3) is provided on the composite slab (2), characterized in that, include: Support rod (4), which can be raised and lowered on beam (1), and a support member (5) supporting steel pipe truss (3) is provided at its upper end. A height-adjusting component is used to adjust the height of the support rod (4); The triggering component, when the composite plate (2) is hoisted down to the upper surface of the beam (1), triggers the height fixing component to lock and fix the height of the support rod (4); A first compartment (6) is fixedly installed on the beam (1), and a second compartment (7) is installed on both opposite sides of the first compartment (6). The support rod (4) is movably installed through the first compartment (6). The height-fixing component is installed inside the first compartment (6) and connected to the support rod (4). The triggering component is installed inside the second compartment (7). The height-fixing component includes a toothed ring (11) rotatably disposed inside the first compartment (6). The toothed ring (11) is sleeved on the support rod (4) and its rotation is linked to the lifting and lowering of the support rod (4). A plate (12) is elastically and movably disposed inside the first compartment (6). A limiting tooth (13) that meshes with the toothed ring (11) is provided on the plate (12). The triggering component includes a trigger (16) rotatably disposed inside the second compartment (7). The trigger (16) has a first state in which the free end extends out of the upper surface of the beam (1) and a second state in which the free end is flush with the upper surface of the beam (1). In the second state of the trigger (16), the plate (12) is limited to a position close to the toothed ring (11).

2. The support-free prestressed composite slab connection node according to claim 1, characterized in that, The first compartment (6) has a cylinder (8) at its lower end. A guide rod (9) is fixedly installed inside the cylinder (8). The lower end of the support rod (4) extends into the cylinder (8) and is provided with a guide groove (10) that matches the guide rod (9).

3. The support-free prestressed composite slab connection node according to claim 1, characterized in that, The outer wall of the support rod (4) is provided with a spiral groove (14), and the inner wall of the toothed ring (11) is provided with a ball (15), which is movably connected to the spiral groove (14).

4. The support-free prestressed composite slab connection node according to claim 1, characterized in that, The side of the plate (12) away from the toothed ring (11) is connected to a movable plate (18) via an elastic element (17). A sliding element (19) is movably connected between the first chamber (6) and the second chamber (7). One end of the sliding element (19) is linked to the rotation of the trigger (16), while the other end is linked to the movement of the movable plate (18). In the second state of the trigger (16), the sliding element (19) drives the movable plate (18) to stay close to the plate (12) to squeeze the elastic element (17).

5. The support-free prestressed composite slab connection node according to claim 4, characterized in that, A sleeve (20) is connected between the first compartment (6) and the second compartment (7), and the sliding member (19) slides through the sleeve (20).

6. The support-free prestressed composite slab connection node according to claim 4, characterized in that, The second compartment (7) is rotatably provided with a lever (21) that is linked with the sliding member (19). In the second state of the trigger member (16), the lever (21) is attached to the end of the composite plate (2).

7. The support-free prestressed composite slab connection node according to claim 6, characterized in that, The inner wall of the second compartment (7) is provided with a groove that matches the sliding member (19), and the lever (21) is provided to fit the inner wall of the second compartment (7).

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