Prestressed steel pipe truss concrete composite slab

Abstract

The present application relates to the technical field of prefabricated composite slab, in particular to a prestressed steel pipe truss concrete composite slab, which comprises a concrete bottom plate, steel pipe truss modules and prestressed tendon net embedded in the concrete bottom plate, two steel pipe truss modules are symmetrically distributed on both sides of the concrete bottom plate, and the steel pipe truss modules extend along the length direction of the concrete bottom plate, the steel pipe truss modules are partially embedded in the concrete bottom plate and are interwoven with the prestressed tendon net; a plurality of longitudinal steel bars are hingedly arranged on both sides of the steel pipe truss modules along the length direction of the concrete bottom plate. The transverse steel bars are arranged in a wave shape, and horizontal supporting parts are arranged at the bottom of the wave trough. When stacking and storing, the horizontal supporting parts abut against the top surface of the concrete bottom plate, so that the upper load is directly and uniformly transmitted to the concrete bottom plate through the mesh pressure bearing structure formed by the longitudinal steel bars and the transverse steel bars, the compressive performance of the concrete bottom plate is effectively utilized, and the pressure is prevented from being concentrated on the easily deformed steel member.

Description

Technical Field

[0001] This invention relates to the field of precast composite slab technology, specifically to prestressed steel pipe truss concrete composite slabs. Background Technology

[0002] Prestressed steel pipe truss concrete composite slab is a composite floor component that combines the high efficiency of prefabrication with the reliability of cast-in-place construction. It uses a prestressed steel pipe truss as the core load-bearing skeleton, combined with a precast concrete base slab and a post-cast concrete composite layer to form an integral whole. The prestressed design improves the crack resistance and stiffness of the component, while the steel pipe truss enhances the load-bearing capacity and overall integrity. It is convenient and economical to construct and is widely used in various building floor projects.

[0003] During the hoisting construction of prestressed steel pipe truss concrete composite slabs, the main connection point of the hoisting ropes is on the truss, which leads to excessive local stress load between the truss and the concrete slab, which can easily cause damage, deformation, or even breakage at the connection point. In addition, during the stacking and transportation process, the truss on the lower composite slab is prone to deformation.

[0004] Chinese invention patent CN115288347B discloses a prestressed concrete composite slab with a steel pipe truss. During hoisting, one end of each longitudinal reinforcing bar is hooked to two fixed side frames, and the other end is hooked to a group of transverse reinforcing bars. These transverse reinforcing bars form the hoisting load-bearing structure, ensuring balanced stress distribution between the bottom slab and the two fixed side frames, reducing the risk of damage, deformation, and breakage. While the pressure is distributed across multiple points during stacking and transportation, the final pressure still acts directly on the easily deformable reinforcing bars. Therefore, there is a limit to the number of stacking layers; otherwise, the bottom layer of the composite slab may be overloaded due to excessive stacking, potentially leading to structural deformation. Summary of the Invention

[0005] The purpose of this invention is to provide a prestressed steel pipe truss concrete composite slab to solve the technical problems mentioned in the background art.

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

[0007] A prestressed steel pipe truss concrete composite slab includes a concrete base slab, steel pipe truss modules, and a prestressed tendon mesh embedded in the concrete base slab. Two steel pipe truss modules are symmetrically distributed on both sides of the concrete base slab, and the steel pipe truss modules extend along the length of the concrete base slab. The steel pipe truss modules are partially embedded in the concrete base slab and interwoven with the prestressed tendon mesh. Several longitudinal steel bars are hinged at intervals along the length of the concrete base slab on both sides of the steel pipe truss modules, and the positions of the longitudinal steel bars on both sides of the steel pipe truss modules correspond one-to-one. Several transverse steel bars extending along the length of the longitudinal steel bars are slidably fitted on the longitudinal steel bars on the same side. The transverse steel bars are in a wavy shape with reciprocating bends, and horizontal support parts are bent at the bottom of each trough of the transverse steel bars. When all the longitudinal steel bars are rotated to a horizontal state, the horizontal support parts on the transverse steel bars abut against the top surface of the concrete base slab. When all the longitudinal steel bars swing to their limit state, the transverse steel bars on the same side slide together to the ends of the longitudinal steel bars to form a hoisting structure.

[0008] Preferably, the ends of the longitudinal steel bars on both sides that are far apart from each other are bent and have support parts; in the hoisting structure posture, each support part abuts against the corner of the long side below the concrete base slab from bottom to top.

[0009] Preferably, the steel pipe truss module includes an upper chord, a pair of corrugated support bars and a pair of straight bars; the two corrugated support bars are symmetrically welded on both sides of the upper chord, and straight bars are welded and fixed on the side of the bottom of the two corrugated support bars that are far apart from each other; the cross-section of the corrugated support bars on both sides is arranged in a figure-eight shape; the straight bars and the troughs of the corrugated support bars are embedded in the concrete base plate.

[0010] Preferably, M-shaped steel members are provided between two adjacent crests of the corrugated support steel bars, and the M-shaped steel members are located above the troughs of the corrugated support steel bars. Both ends of the M-shaped steel members are welded and fixed to the corrugated support steel bars, and the two convex corners of the M-shaped steel members are welded and fixed to the upper chord. A hinged opening is formed between the concave corner of the M-shaped steel member and the upper chord. The longitudinal steel bars are all bent and processed with hinged parts. The hinged parts are wrapped around the outside of the upper chord and pass through the corresponding two hinged openings.

[0011] Preferably, when the longitudinal reinforcement is horizontal, the hinge is inverted Ω shape; when the longitudinal reinforcement swings to form a hoisting structure, the side of the hinge closest to the support abuts against the concave corner of the M-shaped reinforcement on the corresponding side.

[0012] Preferably, one of the longitudinal reinforcing bars on one side has a first bend at the end away from the support, and the other longitudinal reinforcing bar on the other side has a second bend at the end away from the support; the first bend is an open ring shape, and a through hole is formed inside the first bend; the second bend is a semi-circular shape that matches the first bend; when both longitudinal reinforcing bars on both sides are in a horizontal state, the first bend can be fitted into the second bend one by one.

[0013] Preferably, the prestressed steel pipe truss concrete composite slab also includes U-shaped steel bars; the supporting part is a closed triangular shape and forms through holes for the U-shaped steel bars to pass through; the two composite slabs are spliced ​​by passing the straight parts on both sides of the U-shaped steel bars through the through holes on the sides of the two composite slabs respectively.

[0014] Preferably, each crest of the transverse steel bar is bent and processed with an Ω-shaped fitting part, and each fitting part slides and fits onto the longitudinal steel bar in a corresponding manner.

[0015] Preferably, both ends of the transverse reinforcing bars have a third bend, which is in the shape of a horizontal figure 9, and a hoisting hole is formed at the bend of the third bend; the third bend extends beyond the side of the concrete base slab.

[0016] Preferably, the prestressed tendon mesh includes several transverse prestressed steel bars and several longitudinal prestressed steel bars; the troughs of the corrugated support steel bars form through holes with the straight steel bars on the same side; the longitudinal prestressed steel bars are intermittently matched and inserted into the corresponding through holes along the length of the concrete base slab; the transverse prestressed steel bars are evenly distributed on the longitudinal prestressed steel bars along the width of the concrete base slab, and the transverse prestressed steel bars and the longitudinal prestressed steel bars are fixed together by straps or wires.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows.

[0018] This invention uses transverse steel bars arranged in a wave-like pattern, with horizontal support sections at the bottom of the troughs. During stacking, each horizontal support section abuts against the top surface of the concrete base slab, allowing the upper load to be directly and evenly transferred to the concrete base slab through the mesh-like pressure-bearing structure formed by the longitudinal and transverse steel bars. This effectively utilizes the compressive strength of the concrete base slab, avoids pressure concentration on easily deformable steel bars, allows for higher stacking layers without damaging the components, and improves stacking stability and transportation efficiency.

[0019] During hoisting, the present invention uses longitudinal steel bars to swing upward to the limit state, while sliding transverse steel bars are concentrated to form a hoisting structure. The support part abuts against the corner of the long side below the concrete base plate, converting the hoisting lifting force into an upward lifting force on the concrete base plate, effectively dispersing the hoisting stress and preventing the concrete base plate from being crushed or cracked due to excessive local load at the connection between the concrete base plate and the steel pipe truss module.

[0020] This invention uses an M-shaped steel bar to form a hinged opening with the upper chord. The hinged part is wrapped around the outside of the upper chord and passes through the hinged opening, which realizes a stable hinged connection between the longitudinal steel bar and the steel pipe truss module. This can limit the longitudinal steel bar from moving along the length of the upper chord, ensure that the stress points are fixed during hoisting and stacking, and enhance the structural rigidity and deformation resistance. At the same time, the M-shaped steel bar also strengthens the connection between the corrugated support steel bar and the upper chord, improving the overall stability. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 for Figure 1 The diagram shown omits the transverse reinforcement bars.

[0023] Figure 3 for Figure 2 The diagram shown omits the longitudinal reinforcement bars.

[0024] Figure 4 This is a schematic diagram of the steel pipe truss structure in this invention;

[0025] Figure 5 This is a partial structural side view of the steel pipe truss in this invention;

[0026] Figure 6 This is a schematic diagram illustrating the fit between the hinged through-hole and the hinged bending section in this invention.

[0027] Figure 7 This is a schematic diagram showing the fit between the bend in the assembly and the longitudinal steel reinforcement structure in this invention.

[0028] Figure 8 Figure 1 The diagram shows a partial structure.

[0029] Figure 9 For Figure 8 Enlarged schematic diagram of the structure at point A in the middle;

[0030] Figure 10 for Figure 8 Enlarged schematic diagram of the structure at point B;

[0031] Figure 11 This is a structural diagram of the composite slab during hoisting;

[0032] Figure 12 This is a schematic diagram of a prestressed tendon mesh structure;

[0033] Figure 13 for Figure 12 Enlarged schematic diagram of the structure at point C;

[0034] Figure 14This is a schematic diagram of the U-shaped steel bar structure in this invention;

[0035] Figure 15 This is a schematic diagram of two composite plates joined together along their long sides.

[0036] Figure 16 for Figure 15 A magnified schematic diagram of the structure at point D.

[0037] In the diagram: 1. Concrete base slab; 2. Steel pipe truss module; 21. Top chord; 22. Corrugated support reinforcement; 23. Straight reinforcement; 231. Through hole; 24. M-shaped reinforcement member; 25. Hinged through hole; 3. Longitudinal reinforcement; 31. Hinged part; 32. Support part; 33. Through hole; 34. First bend; 341. Through hole; 35. Second bend; 4. Transverse reinforcement; 41. Fitting part; 42. Horizontal support part; 43. Third bend; 431. Lifting hole; 5. Transverse prestressed reinforcement; 6. Longitudinal prestressed reinforcement; 7. U-shaped reinforcement. Detailed Implementation

[0038] The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0039] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection" and "installation" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Furthermore, "connection" can be a direct connection or an indirect connection through an intermediate medium. "Fixed" means that the devices are connected to each other and their relative positional relationship remains unchanged after the connection. The directional terms mentioned in the embodiments of the present invention, such as "inner," "outer," "top," and "bottom," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0040] In this embodiment of the invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0041] In this embodiment of the invention, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0042] References to "one embodiment" or "some embodiments" as used in this specification mean that a particular feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of the invention. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless otherwise specifically emphasized.

[0043] Example 1: Please refer to Figures 1-16 This invention provides a prestressed steel pipe truss concrete composite slab, comprising a concrete base slab 1, steel pipe truss modules 2, and a prestressed tendon mesh embedded in the concrete base slab 1. Two steel pipe truss modules 2 are symmetrically distributed on both sides of the concrete base slab 1, and the steel pipe truss modules 2 extend along the length direction of the concrete base slab 1. The steel pipe truss modules 2 are partially embedded in the concrete base slab 1 and interwoven with the prestressed tendon mesh. Several longitudinal steel bars 3 are hinged at intervals along the length direction of the concrete base slab 1 on both sides of the steel pipe truss modules 2, and the positions of the longitudinal steel bars 3 on both sides of the steel pipe truss modules 2 correspond one-to-one. Several transverse steel bars 4 extending along the length direction of the longitudinal steel bars 3 are slidably fitted on the longitudinal steel bars 3 on the same side.

[0044] In this embodiment, the longitudinal reinforcement 3 is a horizontal L-shape, and the transverse reinforcement 4 is a wave-like shape with reciprocating bends. The total number of transverse reinforcement 4 is preferably four, and the four transverse reinforcement 4 are distributed on two sides of each other. The bottom of each trough of the transverse reinforcement 4 is bent and processed with a horizontal support part 42. When the longitudinal reinforcement 3 is rotated to a horizontal state, the horizontal support part 42 on the transverse reinforcement 4 abuts against the top surface of the concrete base plate 1. When each longitudinal reinforcement 3 swings to its limit state, the transverse reinforcement 4 on the same side slides to the end of the longitudinal reinforcement 3 to form a hoisting structure.

[0045] like Figure 8 and Figure 9 As shown, the ends of the longitudinal steel bars 3 on both sides that are far apart from each other are bent and processed with support parts 32. In the posture of the hoisting structure, each support part 32 abuts against the corner of the long side below the concrete base plate 1 from bottom to top.

[0046] like Figures 2-6 As shown, the steel pipe truss module 2 includes an upper chord 21, a pair of corrugated support bars 22, and a pair of straight bars 23. The upper chord 21 can be a hollow steel pipe or a solid bar. The two corrugated support bars 22 are symmetrically welded to both sides of the upper chord 21. Specifically, the crests of the corrugated support bars 22 are fixed to the upper chord 21, and straight bars 23 are welded to the sides of the bottom of the two corrugated support bars 22 that are far apart from each other. Figure 5 As shown, the cross-section of the corrugated support steel bars 22 on both sides is arranged in a figure-eight shape. The straight steel bars 23 and the troughs of the corrugated support steel bars 22 are embedded in the concrete base slab 1. When making this composite slab, the upper chord 21 and the two corrugated support steel bars 22 form an inverted V-shaped structure, which is placed inverted in the casting template. The structure is smaller at the top and larger at the bottom, which has high stability and strong resistance to concrete impact. Straight steel bars 23 are welded and fixed on both corrugated support steel bars 22 and embedded in the concrete base slab 1 together with the bottom of the corrugated support steel bars 22, which can enhance the connection strength between the corrugated support steel bars 22 and the concrete.

[0047] like Figure 12 and Figure 13 As shown, the prestressed tendon mesh includes several transverse prestressed steel bars 5 and several longitudinal prestressed steel bars 6. Through holes 231 are formed between the troughs of the corrugated support steel bars 22 and the straight steel bars 23 on the same side. Four through holes 231 corresponding to the positions in the width direction of the concrete base slab 1 form a group of holes. The longitudinal prestressed steel bars 6 are arranged at intervals along the length direction of the concrete base slab 1, and are correspondingly matched and inserted into the four through holes 231 of each group of holes. The transverse prestressed steel bars 5 are arranged at intervals above the longitudinal prestressed steel bars 6 along the width direction of the concrete base slab 1, and are fixed to the longitudinal prestressed steel bars 6 by straps or wires. Before pouring, the corrugated support steel bars 22, straight steel bars 23, transverse prestressed steel bars 5, and longitudinal prestressed steel bars 6 are interwoven in a mesh, exhibiting strong resistance to deformation. After pouring, they serve as internal reinforcing ribs of the concrete base slab 1, effectively ensuring the structural strength and load-bearing capacity of the concrete base slab 1.

[0048] When stacking these composite panels:

[0049] All longitudinal reinforcing bars 3 and transverse reinforcing bars 4 are horizontal, with the longitudinal reinforcing bars 3 extending along the width of the concrete base slab 1 and the transverse reinforcing bars 4 extending along the length of the concrete base slab 1. By adjusting the transverse reinforcing bars 4 left and right along the width of the concrete base slab 1, the spacing of the transverse reinforcing bars 4 is made uniform; at the same time, as Figure 7 As shown, the horizontal support portions 42 on each transverse reinforcing bar 4 abut against the top of the concrete base slab 1, and the overall state is as follows. Figure 1As shown, the upper concrete base slab 1 is directly supported on the mesh bearing structure formed by the lower upper chord 21, longitudinal steel bars 3 and transverse steel bars 4, which can evenly distribute the upper load to multiple support points and avoid component deformation or damage caused by local stress concentration. Through the contact between the horizontal support part 42 and the concrete base slab 1, the horizontal support part 42 can directly distribute the upper pressure to the concrete base slab 1, effectively utilizing the compressive strength of the concrete base slab 1 and avoiding pressure concentration on easily deformable steel reinforcement components. This enhances the load-bearing capacity and stability of the composite slab in the stacked state, allows for a higher number of stacking layers, and improves transportation and storage efficiency.

[0050] During hoisting:

[0051] The longitudinal reinforcing bars 3 on both sides swing upwards, while the transverse reinforcing bars 4 on each longitudinal reinforcing bar 3 are slidably adjusted along the length of the longitudinal reinforcing bars 3 to the side away from the support part 32, forming a lifting point. The lifting rope is then directly connected to the transverse reinforcing bars 4, and the overall structure is as follows: Figure 11 As shown, during the swing adjustment of the longitudinal steel bar 3, the end of the longitudinal steel bar 3 located at the support part 32 swings downward, and the support part 32 abuts against the corner of the long side below the concrete base slab 1 from bottom to top.

[0052] During the lifting process, the lifting rope transmits the lifting force through the lifting structure composed of the transverse steel bar 4 and the longitudinal steel bar 3. The support part 32 supports the long side corner below the concrete base slab 1, converting part of the tension into an upward supporting force on the concrete base slab 1. This effectively disperses the lifting stress and prevents the connection point from being crushed or cracked due to stress concentration in the concrete base slab 1, thereby improving the safety and reliability of the lifting process.

[0053] Furthermore, in this application, the longitudinal steel bars 3 on both sides are distributed in a one-to-one correspondence, and the supporting parts 32 on both sides are also distributed in a one-to-one correspondence, so that the stress points are uniform and synchronous during hoisting, avoiding the tilting, torsion or excessive stress on one side of the concrete base plate 1 due to asymmetry of stress points, and further ensuring the stability and safety of the hoisting process.

[0054] Example 2: Based on Example 1, this example provides a detailed explanation of how the longitudinal reinforcement 3 and the transverse reinforcement 4 are specifically arranged, as follows:

[0055] Please see Figure 6M-shaped steel members 24 are provided between two adjacent wave crests of the wavy support steel bar 22. The M-shaped steel members 24 are located above the troughs of the wavy support steel bar 22. Both ends of the M-shaped steel members 24 are welded and fixed to the wavy support steel bar 22. The two convex corners of the M-shaped steel members 24 are welded and fixed to the upper chord 21. The concave corner of the M-shaped steel members 24 forms a hinged through-hole 25 with the upper chord 21. The longitudinal steel bars 3 are all bent and processed with hinged parts 31. When the longitudinal steel bars 3 are in a horizontal state, the hinged parts 31 are inverted Ω shape. The hinged parts 31 are wrapped around the outside of the upper chord 21 and pass through the corresponding two hinged through-holes 25. By using the hinged parts 31 to fit around the outside of the upper chord 21 and pass through the hinged through-holes 25 on both sides, the longitudinal steel bars 3 and the upper chord 21 are hinged, thereby enabling the longitudinal steel bars 3 to rotate and adjust.

[0056] Furthermore, when the longitudinal steel bar 3 swings to form a hoisting structure, the side of the hinge 31 closest to the support 32 abuts against the concave corner of the M-shaped steel bar 24 on the corresponding side. At this time, the longitudinal steel bar 3 swings to its limit position. On the one hand, this limits the longitudinal steel bar 3 from swinging excessively, ensuring that the longitudinal steel bar 3 is in the correct hoisting posture. On the other hand, it ensures that the support 32 abuts against the corner of the long side below the concrete base slab 1. When the longitudinal steel bar 3 is hoisted with its end away from the support 32 swinging upwards, the support 32 abuts against the corner of the concrete base slab 1, and the side of the hinge 31 abuts against the concave corner of the hinge opening 25, together forming a stable mechanical triangle. This not only effectively disperses and transmits the lifting force generated by the hoisting to the corner of the concrete base slab 1, but also limits the swing amplitude of the longitudinal steel bar 3, preventing the longitudinal steel bar 3 from overturning and causing overall tilting, thus ensuring the balance and stability of the hoisting posture.

[0057] The hinged through-hole 25 formed by the M-shaped steel bar 24 and the upper chord 21 can restrict the longitudinal steel bar 3 from moving along the direction of the upper chord 21, thus fixing the stress points between the longitudinal steel bar 3 and the upper chord 21. This ensures that the stress points between the longitudinal steel bar 3 and the upper chord 21 are fixed and constant during hoisting and load-bearing. In addition, the M-shaped steel bar 24 not only serves as a limiting component for fixing the position of the longitudinal steel bar 3, but also further securely connects the corrugated support steel bar 22 and the upper chord 21, achieving two goals at once.

[0058] Please see Figure 7 Each crest of the transverse steel bar 4 is bent and processed with an Ω-shaped fitting part 41. Each fitting part 41 is slidably fitted onto the longitudinal steel bar 3 in a corresponding manner. By fitting the fitting part 41 onto the outside of the longitudinal steel bar 3, the transverse steel bar 4 has the ability to move and adjust in the width direction of the concrete base slab 1.

[0059] Example 3: The difference between this example and Example 2 is as follows:

[0060] like Figure 7 As shown, both ends of the transverse steel bar 4 have a third bend 43. The third bend 43 is in the shape of a horizontal figure 9. The bending part of the third bend 43 forms a hoisting hole 431. The hoisting hole 431 serves as a hoisting point, through which a hoisting rope can pass for connection. The third bend 43 extends beyond the side of the concrete base slab 1 to be combined with the adjacent concrete composite slab.

[0061] like Figure 14 As shown, this prestressed steel pipe truss concrete composite slab also includes U-shaped steel bars 7, such as... Figure 9 As shown, the support portion 32 is a closed triangular shape, and forms through holes 33 for the U-shaped steel bars 7 to pass through, as shown. Figure 15 and Figure 16 As shown, the two composite slabs are connected by passing the straight sections of the U-shaped steel bars 7 through the connecting holes 33 on the sides of the two composite slabs.

[0062] Whether during stacking or construction, the U-shaped steel bars 7 are passed through the connecting holes 33 on the sides of the two adjacent composite slabs to limit and reinforce the composite slabs along the length of the concrete base slab 1. The transverse steel bars 4 on the two adjacent composite slabs are staggered, and then straight steel bars are inserted into the lifting holes 431 on the two composite slabs in sequence to limit and reinforce the composite slabs along the width of the concrete base slab 1. This achieves bidirectional limiting and locking of the composite slabs. Combined with the longitudinal steel bars 3 and the transverse steel bars 4, a stable planar connection system is formed. This effectively prevents the adjacent composite slabs from shifting or moving in any direction during stacking, transportation, and on-site construction, and achieves rapid and accurate positioning and connection between the composite slabs.

[0063] Example 4: Please refer to Figure 8 and Figure 10 The difference between this embodiment and Embodiment 3 is as follows:

[0064] One of the longitudinal steel bars 3 on one side has a first bend 34 at the end away from the support 32, and the other longitudinal steel bar 3 on the other side has a second bend 35 at the end away from the support 32. The first bend 34 is an open ring shape, and a through hole 341 is formed inside the first bend 34. The second bend 35 is a semi-circular shape that matches the first bend 34. When both longitudinal steel bars 3 are in a horizontal state, the first bend 34 can be fitted into the second bend 35 one by one. By inserting the straight steel bar into the through hole 341, the structural strength of the longitudinal steel bars 3 on both sides can be enhanced during stacking or construction.

[0065] Furthermore, during the later stages of pouring, the steel pipe truss modules 2, longitudinal reinforcement 3, transverse reinforcement 4, and prestressed tendon mesh on the two adjacent concrete base slabs 1 can form a three-dimensional, continuous, and dense spatial reinforcement network, which enhances the bonding force between the post-poured concrete and the precast base slab. At the same time, the transverse reinforcement 4 is wavy and is set in a way that abuts against the top surface of the concrete base slab 1, which further strengthens the bonding force with the concrete, thereby improving the stiffness, crack resistance, and load-bearing capacity of the composite floor structure.

[0066] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

Claims

1. A prestressed steel pipe truss concrete composite slab, comprising a concrete base slab (1), steel pipe truss modules (2), and a prestressed tendon mesh embedded in the concrete base slab (1), wherein two steel pipe truss modules (2) are symmetrically distributed on both sides of the concrete base slab (1), and the steel pipe truss modules (2) extend along the length direction of the concrete base slab (1), characterized in that: The steel pipe truss module (2) is partially embedded in the concrete base slab (1) and interwoven with the prestressed tendon mesh; Both sides of the steel pipe truss module (2) are connected with a number of longitudinal steel bars (3) at intervals along the length of the concrete base plate (1), and the positions of the longitudinal steel bars (3) on both sides of the steel pipe truss module (2) correspond one to one. Several transverse steel bars (4) extending along the length direction of the longitudinal steel bars (3) are slidably fitted on the longitudinal steel bars (3) on the same side. The transverse steel bar (4) is in a wave-like shape with reciprocating bends, and the bottom of each trough of the transverse steel bar (4) is bent and processed with a horizontal support part (42). When all the longitudinal steel bars (3) are rotated to a horizontal state, each of the horizontal support parts (42) on the transverse steel bars (4) abuts against the top surface of the concrete base plate (1); When all the longitudinal steel bars (3) swing to their limit, the transverse steel bars (4) on the same side slide together to the end of the longitudinal steel bars (3) to form a hoisting structure; The ends of the longitudinal steel bars (3) on both sides that are far apart from each other are bent and processed to have a support part (32); In the hoisting structure's posture, each of the supporting parts (32) abuts against the lower long side corner of the concrete base plate (1) from bottom to top.

2. The prestressed steel pipe truss concrete composite slab according to claim 1, characterized in that: The steel pipe truss module (2) includes an upper chord (21), a pair of corrugated support bars (22) and a pair of straight bars (23); Two wavy support bars (22) are symmetrically welded to both sides of the upper chord (21), and the straight bars (23) are welded and fixed to the sides of the bottom of the two wavy support bars (22) that are far apart from each other. The cross-sections of the corrugated support steel bars (22) on both sides are arranged in a figure-eight shape; The straight steel bar (23) and the trough of the corrugated support steel bar (22) are both embedded in the concrete base plate (1).

3. The prestressed steel pipe truss concrete composite slab according to claim 2, characterized in that: The corrugated support steel bar (22) is provided with M-shaped steel bar members (24) between two adjacent crests, and the M-shaped steel bar members (24) are located above the troughs of the corrugated support steel bar (22); Both ends of the M-shaped steel bar (24) are welded and fixed to the corrugated support steel bar (22), and the two upper convex corners of the M-shaped steel bar (24) are welded and fixed to the upper chord (21); The concave corner of the M-shaped steel bar (24) forms a hinged through-hole (25) with the upper chord (21). The longitudinal steel bars (3) are all bent and have hinged parts (31). The hinge (31) is wrapped around the outside of the upper chord (21) and passes through the corresponding two hinge openings (25).

4. The prestressed steel pipe truss concrete composite slab according to claim 3, characterized in that: When the longitudinal steel bar (3) is in a horizontal state, the hinge (31) is in an inverted Ω shape; When the longitudinal steel bar (3) swings to form a hoisting structure, the hinge (31) on the side near the support (32) abuts against the concave corner of the M-shaped steel bar (24) on the corresponding side.

5. The prestressed steel pipe truss concrete composite slab according to claim 1, characterized in that: One of the longitudinal steel bars (3) on one side has a first bend (34) at the end away from the support (32), and the other longitudinal steel bar (3) on the other side has a second bend (35) at the end away from the support (32). The first bend (34) is a ring shape with an opening, and a through hole (341) is formed inside the first bend (34). The second bend (35) is a semi-circular shape that is adapted to the first bend (34); When the longitudinal steel bars (3) on both sides are in a horizontal state, the first bent part (34) can be fitted into the second bent part (35) one by one.

6. The prestressed steel pipe truss concrete composite slab according to claim 1, characterized in that: It also includes U-shaped steel bars (7); The supporting part (32) is a closed triangular shape and forms a through hole (33) for the U-shaped steel bar (7) to pass through. The two composite slabs are spliced ​​by passing the straight sections on both sides of the U-shaped steel bar (7) through the connecting holes (33) on the sides of the two composite slabs.

7. The prestressed steel pipe truss concrete composite slab according to claim 1, characterized in that: Each crest of the transverse steel bar (4) is bent and processed with an Ω-shaped fitting part (41), and each fitting part (41) is slidably fitted onto the longitudinal steel bar (3) in a corresponding manner.

8. The prestressed steel pipe truss concrete composite slab according to claim 1, characterized in that: The transverse steel bar (4) has a third bend (43) at both ends. The third bend (43) is in the shape of a horizontal figure 9. A hoisting hole (431) is formed at the bend of the third bend (43). The third bend (43) extends beyond the side of the concrete base plate (1).

9. The prestressed steel pipe truss concrete composite slab according to claim 2, characterized in that: The prestressed tendon mesh includes several transverse prestressed steel bars (5) and several longitudinal prestressed steel bars (6); A through hole (231) is formed between the trough of the corrugated support steel bar (22) and the straight steel bar (23) on the same side. The longitudinal prestressed steel bars (6) are intermittently matched and inserted into the corresponding insertion holes (231) along the length of the concrete base plate (1); The transverse prestressed steel bars (5) are evenly distributed on the longitudinal prestressed steel bars (6) along the width direction of the concrete base plate (1), and the transverse prestressed steel bars (5) and the longitudinal prestressed steel bars (6) are fixed together by straps or wires.

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