Bidirectional laminated slab joint connecting structure and construction process thereof

Abstract

The invention relates to the technical field of fabricated buildings, and provides a two-way laminated slab joint connecting structure and a construction technology thereof.The two-way laminated slab joint connecting structure comprises multiple prefabricated bottom plates and cast-in-place layers, the multiple prefabricated bottom plates are arranged at intervals, and a joint area used for pouring the cast-in-place layers is formed between every two adjacent prefabricated bottom plates; the prefabricated bottom plate comprises a main body truss and a plurality of load-bearing steel bars arranged in the main body truss, and one end of each load-bearing steel bar penetrates out of the main body truss and extends into the joint area; a steel strand is arranged in the main truss, the two ends of the steel strand are connected with stressed steel bars of the main truss respectively, the middle of the steel strand extends into the joint area, and a hanging column for hanging the steel strand is arranged in the joint area. According to the two-way laminated slab joint connecting structure, the crack resistance of the joint connecting position of the laminated slabs can be improved.

Description

Technical Field

[0001] This application relates to the technical field of prefabricated buildings, and in particular to a two-way composite slab joint connection structure and its construction process. Background Technology

[0002] Prefabricated buildings have been widely used in recent years due to their advantages such as fast construction speed, controllable quality, and environmental friendliness. As a core component of prefabricated buildings, two-way composite slabs achieve efficient collaboration between factory production and on-site construction through the combination of precast base slabs and cast-in-place layers. Currently, there is considerable practice in the design and construction of two-way composite slabs both domestically and internationally, but technical bottlenecks still exist in areas such as joint connections and overall structural integrity. With the development of building structures towards larger spans and lighter weights, higher demands are being placed on the mechanical properties and construction efficiency of composite slabs.

[0003] Traditional composite slab joints primarily rely on post-cast strips or exposed reinforcing bars for connection, achieving the link between the precast slab and the cast-in-place layer through binding or welding. The advantage is simple construction, but the disadvantage is that cracking is easily caused by stress concentration or differences in shrinkage between new and old concrete. Therefore, there is an urgent need for a composite slab joint connection structure to improve the crack resistance of the joints and inhibit crack propagation. Summary of the Invention

[0004] To improve the crack resistance of the joints of composite slabs, this application provides a two-way composite slab joint connection structure and its construction process.

[0005] Firstly, the bidirectional composite slab joint connection structure provided in this application adopts the following technical solution: A two-way composite slab joint connection structure includes a precast base slab and a cast-in-place layer. Multiple precast base slabs are spaced apart, forming a joint area between adjacent precast base slabs for casting the cast-in-place layer. Each precast base slab includes a main truss and multiple reinforcing bars within the main truss. One end of each reinforcing bar extends out of the main truss and into the joint area. Steel strands are arranged within the main truss, with both ends connected to the reinforcing bars of the main truss. The middle portion of each steel strand extends into the joint area, and a hanging post is provided within the joint area for attaching the steel strands.

[0006] By adopting the above technical solution, steel strands are installed within the precast base slab, with the middle portion of the steel strands extending into the joint area to connect with the cast-in-place layer, further enhancing the connection stability between the precast base slab and the cast-in-place layer. The flexible nature of the steel strands allows them to work in conjunction with the reinforcing bars to adapt to deformation requirements in different directions. Especially in the joint area, by using the steel strands as joint connecting bars, their high strength and low relaxation characteristics provide sufficient longitudinal tensile strength and two-way slab bending moment transfer capacity at the joint, improving the crack resistance of the composite slab joint.

[0007] Optionally, a joint reinforcement mesh is provided in the cast-in-place layer. The joint reinforcement mesh includes multiple horizontal and vertical bars arranged in a crisscross pattern. One end of the stressed bar extends into the joint area and is connected to the vertical bar. A tensioning mechanism for tightening the steel strands is provided on the joint reinforcement mesh.

[0008] By adopting the above technical solution, the steel strands are tightened using a tensioning mechanism, thereby improving the connection stability between two adjacent precast base plates and the cast-in-place layer.

[0009] Optionally, the steel strands of two adjacent precast base plates are arranged in a crisscross pattern within the joint area. The tensioning mechanism includes mounting strips, first abutment posts, and a drive assembly. Two mounting strips are spaced apart within the joint area. The first abutment posts are located between the two mounting strips. A first connecting rod is provided between the first abutment post and each of the two mounting strips. One end of the first connecting rod is hinged to the first abutment post, and the other end is hinged to the mounting strip. There are two first abutment posts, which are respectively located on the outer side of the intersection of the two steel strands. When the two mounting strips approach each other, the two first abutment posts approach each other to tighten the steel strands of the two adjacent precast base plates. The drive assembly is detachably connected to the mounting strips to drive the two mounting strips to approach each other.

[0010] By adopting the above technical solution, the steel strands of two adjacent precast base plates are respectively hung on the hanging posts in the joint area, so that the two steel strands are arranged in a cross pattern in the joint area. Then, two mounting strips are placed in the joint area from top to bottom, so that the first abutment posts are inserted into the outer side of the intersection of the two steel strands. Next, the driving component is used to drive the two mounting strips closer to each other, so that the two first abutment posts can squeeze the intersection of the two steel strands, thereby tightening the steel strands and improving the connection stability of the overall structure.

[0011] Optionally, each of the mounting strips is connected to a guide rod, with both ends of the guide rod extending along the length of the transverse rib; each mounting strip has a guide groove on its side wall, which is used for the guide rod of another mounting strip to pass through, and the two mounting strips are slidably connected by the guide rod; the guide rods of the two mounting strips are arranged at intervals along the height direction to form a passage area for the vertical rib to pass through.

[0012] By adopting the above technical solution, the guide rod and guide groove are fitted together to achieve a sliding connection between the two mounting strips, allowing the two sliding strips to move closer or further apart along the length of the guide rod. Furthermore, the vertical reinforcement passes through the through-hole area between the guide rods of the two mounting strips. After the steel strand is tightened, the mounting strips, steel strands, and joint reinforcement mesh are connected as a whole, improving the overall structural stability.

[0013] Optionally, each of the mounting bars is hinged with two second connecting rods. One end of the second connecting rod is hinged with a second abutment post, and the other end is hinged with a third abutment post. The second abutment posts of the two second connecting rods are respectively arranged on the inner side of the intersection of the two steel strands. When the first abutment post tightens the steel strand, the steel strand pushes the second connecting rod through the second abutment post and forces the third abutment post to abut against the steel strand.

[0014] By adopting the above technical solution, the two mounting strips are driven to move closer to each other, which in turn drives the two first abutting posts to move closer to each other to tighten the steel strand. During this process, the steel strand is pushed by the first abutting posts to push the second abutting post, thereby causing the second connecting rod to rotate at a certain angle so that the third abutting post is pressed against the steel strand. The first abutting post and the third abutting post force the steel strand to form a greater torsional deformation, thereby improving the tightening effect on the steel strand and reducing the slippage of the mounting strips to a certain extent, thus reducing the workload.

[0015] Optionally, the upper end of the first abutment post is hinged to the first connecting rod, and the outer diameter of the first abutment post gradually increases from bottom to top; the upper end of the second abutment post is hinged to the second connecting rod, and the outer diameter of the second abutment post gradually decreases from bottom to top.

[0016] By adopting the above technical solution, the clamping stability at the intersection of the two steel strands is improved by utilizing the change in the outer diameter of the first and second abutting posts.

[0017] Optionally, both of the two mounting strips have slidably mounted abutment strips for abutting against the vertical ribs on their adjacent sidewalls. The mounting strips are provided with pushers, and when the first abutment post is tensioned with the steel strand, the pushers force the abutment strips to press against the vertical ribs.

[0018] By adopting the above technical solution, the pushing component forces the abutment strip to press against the vertical bar, thereby enhancing the connection between the installation strip and the joint steel mesh, and integrating the joint steel mesh, steel strands, installation strip and other related structures into one.

[0019] Optionally, the second link is provided with a rotating shaft, which is rotatably connected to the mounting bar, and the second link is hinged to the mounting bar through the rotating shaft; the pushing member includes a pushing cam, which is disposed on the outer peripheral wall of the rotating shaft, and the outer wall of the pushing cam is used to push against the mounting bar.

[0020] By adopting the above technical solution, during the process of pushing and tightening the steel strand by the first abutting column, the rotating shaft of the second connecting rod is driven to rotate, thereby pushing the abutting strip by the pushing cam, so that the abutting strip abuts against the vertical bar, improving the connection stability between the installation strip and the joint steel mesh.

[0021] Optionally, the second connecting rod includes a first connecting section and a second connecting section connected to each other, a second abutting post hinged to the first connecting section, and a third abutting post hinged to the second connecting section; a support sleeve is slidably sleeved on the outer wall of the first connecting section, and a return spring is provided between the support sleeve and the first connecting section; when the first abutting post is tensioned with the steel strand, the support sleeve abuts against the side of the vertical rib away from the abutting bar.

[0022] By adopting the above technical solution, during the process of the first abutting column pushing and tightening the steel strand, it drives the rotating shaft of the second connecting rod to rotate, so that the abutting strip abuts against the vertical bar; during this process, the support sleeve abuts against the side of the vertical bar away from the abutting strip to form a supporting effect on the vertical bar, reducing the possibility of deformation of the vertical bar due to the pushing of the abutting strip; the combination of the abutting strip and the support sleeve "hugs" the vertical bar, improving the connection stability of the overall structure.

[0023] Secondly, the construction process for a two-way composite slab joint connection structure provided in this application adopts the following technical solution: A construction process for a two-way composite slab joint connection structure includes the following steps: S1, fabrication of precast base slab; S2, installation of precast base slab: on-site installation of precast base slab, adjustment of position and fixing; S3, fabrication of joint reinforcement mesh: fabrication of joint reinforcement mesh in the joint area; S4, pouring of cast-in-place layer.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. By installing steel strands and extending their middle sections into the joint area to connect with the cast-in-place layer, the connection stability between the precast slab and the cast-in-place layer is further enhanced. The flexibility of the steel strands allows them to work in conjunction with the reinforcing bars to adapt to deformation requirements in different directions. Especially in the joint area, by using the steel strands as joint connecting bars, their high strength and low relaxation characteristics provide sufficient longitudinal tensile strength and two-way slab bending moment transfer capacity at the joint, improving the crack resistance of the composite slab joint. 2. By setting up a tensioning mechanism, the steel strands of two adjacent precast base plates are respectively hooked onto the hooking posts in the joint area, so that the two steel strands are arranged in a crisscross pattern in the joint area. Then, two mounting strips are placed in the joint area from top to bottom, so that the first abutment posts are inserted into the outer side of the intersection of the two steel strands. Next, the driving component is used to drive the two mounting strips closer to each other, so that the two first abutment posts can squeeze the intersection of the two steel strands, thereby tightening the steel strands and improving the connection stability of the overall structure; 3. Through the setting of the abutment strip and the support sleeve, during the process of the first abutment column pushing and tightening the steel strand, it drives the rotation shaft of the second connecting rod to rotate, so that the abutment strip abuts against the vertical bar; during this process, the support sleeve abuts against the side of the vertical bar away from the abutment strip, so as to form a support effect on the vertical bar and reduce the possibility of deformation of the vertical bar due to the pushing of the abutment strip; the combination of the abutment strip and the support sleeve "hugs" the vertical bar, improving the connection stability of the overall structure. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of Example 1; Figure 2 This is a schematic diagram illustrating the structure of the steel strand in Example 1; Figure 3 This is a schematic diagram illustrating the structure of the joint reinforcement mesh in Example 1; Figure 4 This is a schematic diagram illustrating the tensioning mechanism in Example 1; Figure 5 This is a partial sectional view of the penetration area in Embodiment 1; Figure 6 This is a schematic diagram illustrating the structure of the driving component in Embodiment 1; Figure 7 This is a partial cross-sectional view of Embodiment 2 illustrating the second connecting rod; Figure 8 This is a schematic diagram illustrating the structure of the first abutment post in Embodiment 2; Figure 9 This is a schematic diagram illustrating the structure of the second abutment post in Embodiment 2; Figure 10 This is a partial cross-sectional view of Embodiment 3, showing the abutment strip and the support sleeve.

[0026] Explanation of reference numerals in the attached drawings: 1. Precast base slab; 11. Joint area; 12. Main truss; 13. Reinforcing steel bars; 14. Hanging column; 15. Connecting strip; 2. Cast-in-place layer; 3. Steel strand; 31. Steel wire rope; 32. Rope loop; 4. Joint reinforcement mesh; 41. Horizontal reinforcement; 42. Vertical reinforcement; 5. Tensioning mechanism; 51. Installation strip; 511. Guide rod; 512. Guide groove; 513. Through-hole area; 514. Groove; 515. Locking nut; 516. Sliding rod; 5 2. First abutment post; 53. First connecting rod; 54. Second connecting rod; 541. Second abutment post; 542. Third abutment post; 543. Rotating shaft; 544. Push cam; 545. First connecting section; 546. Second connecting section; 55. Clamping seat; 56. Clamping bar; 561. Clamping block; 57. Grip cylinder; 6. Abutment bar; 61. Clearance groove; 62. Elastic pad; 7. Support sleeve; 71. Return spring; 72. Support block; 73. Rotating rod. Detailed Implementation

[0027] The following combination Figures 1-10 This application will be described in further detail.

[0028] Example 1: This application discloses a bidirectional composite plate joint connection structure.

[0029] Reference Figure 1 , Figure 2 A two-way composite slab joint connection structure includes a precast base slab 1 and a cast-in-place layer 2. The precast base slab 1 is a precast component. The lower edge of the precast base slab 1 is used to overlap the building wall (the building wall is not shown in the figure). There are multiple precast base slabs 1 (only two are shown in the figure). A joint area 11 is set between two adjacent precast base slabs 1 and forms a joint area 11 on the building wall. The joint area 11 is used to pour the cast-in-place layer 2. The precast base slab 1 and the cast-in-place layer 2 are combined to form a building floor slab.

[0030] The precast base slab 1 includes a main truss 12 and multiple reinforcing bars 13. In this embodiment, the main truss 12 is a rectangular frame structure formed by bending reinforcing bars. In other embodiments, the main truss 12 can also be formed by assembling multiple I-beams. The reinforcing bars 13 are installed inside the main truss 12, with one end of the reinforcing bar 13 passing through the main truss 12 and extending into the joint area 11. The reinforcing bars 13 are welded and fixed to the main truss 12. In specific manufacturing, after the multiple reinforcing bars 13 are connected and fixed to the main truss 12, the main truss 12 is placed in a mold, and concrete is poured. After the concrete solidifies, the precast base slab 1 is obtained.

[0031] The main truss 12 is equipped with steel strands 3, which include steel wire ropes 31 and rope sleeves 32. The steel wire ropes 31 have multiple strands, and the rope sleeves 32 are fitted over all the steel wire ropes 31 to integrate them. Both ends of each steel wire rope 31 extend out of the rope sleeves 32 and are connected to the reinforcing bars 13 inside the main truss 12. In this embodiment, the steel wire ropes 31 and the reinforcing bars 13 are fixed by binding and welding.

[0032] Reference Figure 3 , Figure 4 The middle part of the steel strand 3 extends into the joint area 11 (that is, the rope loop 32 extends into the joint area 11). Each precast base plate 1 is connected with a connecting strip 15. One end of the connecting strip 15 is welded and fixed to the main truss 12 of the precast base plate 1. The other end of the connecting strip 15 extends into the joint area 11 and is fixedly connected to a hanging post 14. The hanging post 14 is used for hanging the steel strands 3 of adjacent precast base plates 1. The steel strands 3 of two adjacent precast base plates 1 are arranged in a cross pattern in the joint area 11.

[0033] In this embodiment, a joint reinforcement mesh 4 is provided within the cast-in-place layer 2. The joint reinforcement mesh 4 includes multiple horizontal bars 41 and multiple vertical bars 42, which are arranged in a staggered pattern. The two ends of the horizontal bars 41 extend along the width direction of the joint area 11, and the two ends of the vertical bars 42 extend along the length direction of the joint area 11. One end of the reinforcing bar 13 of the precast base slab 1 extends into the joint area 11 and is welded and fixed to the vertical bars 42. With this design, the joint reinforcement mesh 4 serves as the skeleton connecting the precast base slab 1, improving the connection stability between the precast base slab 1 and the cast-in-place layer 2.

[0034] Reference Figure 4 , Figure 5 A tensioning mechanism 5 is provided on the joint reinforcement mesh 4 to tighten the steel strands 3. The tensioning mechanism 5 includes mounting strips 51, first abutment posts 52, and a drive assembly. The mounting strips 51 are arranged in the joint area 11, with two strips spaced apart along the width direction of the joint area 11. Each mounting strip 51 is connected to a guide rod 511, with both ends of the guide rod 511 extending along the length direction of the transverse reinforcement 41. Each mounting strip 51 has a guide groove 512 on its side wall, which is used for the guide rod 511 of another mounting strip 51 to pass through. One end of the guide rod 511 is bolted to the corresponding mounting strip 51, and the other end passes through the guide groove 512 of another mounting strip 51. The two mounting strips 51 are slidably connected by the guide rod 511. It should be noted that in this embodiment, the guide rods 511 of the two mounting strips 51 are arranged at intervals along the height direction to form a passage area 513 for the vertical reinforcement 42 to pass through.

[0035] The first abutment post 52 is located between the two mounting strips 51. A first connecting rod 53 is connected between the first abutment post 52 and the two mounting strips 51. One end of the first connecting rod 53 is hinged to the first abutment post 52, and the other end is hinged to the mounting strip 51. In this embodiment, there are two first abutment posts 52. The two first abutment posts 52 are respectively arranged on the outside of the intersection of the two steel strands 3. When the two mounting strips 51 approach each other, the two first abutment posts 52 approach each other to simultaneously tighten the steel strands 3 of the two adjacent precast base plates 1.

[0036] Reference Figure 5 , Figure 6 Two grooves 514 are provided on the sidewalls of the two mounting strips 51 that are far apart from each other. The two grooves 514 are arranged at intervals along the length of the mounting strip 51. The drive assembly is detachably connected to the mounting strip 51 to drive the two mounting strips 51 to move closer to each other. The drive assembly includes a clamping seat 55, a clamping strip 56 and a gripper cylinder 57. There are two clamping strips 56. The two clamping strips 56 are slidably installed on the bottom wall of the clamping seat 55. Two clamping blocks 561 are fixedly installed on the bottom wall of each clamping strip 56. The two clamping blocks 561 are respectively used to embed into the two grooves 514 of the mounting strip 51.

[0037] The gripper cylinder 57 is fixedly mounted on the gripper base 55. The two gripping ends of the gripper cylinder 57 are respectively fixedly connected to the two gripping bars 56 to drive the two gripping bars 56 to move closer or further apart. In addition, it should be noted that the outer surface of the guide rod 511 has a threaded section (not shown in the figure). Each guide rod 511 has a locking nut 515 threaded on its outer peripheral wall. When the gripping bars 56 force the two mounting bars 51 to move closer together and tighten the steel strand 3, the locking nut 515 is used to lock the guide rod 511 to fix the position of the two mounting bars 51.

[0038] The implementation principle of Embodiment 1 of this application is as follows: steel strands 3 are installed inside the precast base slab 1, and the middle part of the steel strands 3 extends into the joint area 11 and connects with the cast-in-place layer 2, further enhancing the connection stability between the precast base slab 1 and the cast-in-place layer 2. The flexible characteristics of the steel strands 3 enable them to work in conjunction with the reinforcing bars 13 to adapt to deformation requirements in different directions. Especially in the joint area 11, by using the steel strands 3 as joint connecting bars, the high strength and low relaxation characteristics of the steel strands 3 provide sufficient longitudinal tensile strength and two-way slab bending moment transfer capacity at the joint, thereby improving the crack resistance of the composite slab joint connection.

[0039] When connecting the steel strands 3, the steel strands 3 of two adjacent precast base plates 1 are respectively hung on the hanging posts 14 in the joint area 11, so that the two steel strands 3 are arranged in a cross pattern in the joint area 11. Then, the two mounting strips 51 are placed in the joint area 11 from top to bottom, so that the first abutment posts 52 are respectively inserted into the outer side of the intersection of the two steel strands 3. Next, the two mounting strips 51 are driven closer to each other, so that the two first abutment posts 52 can squeeze the intersection of the two steel strands 3, thereby simultaneously tightening the two steel strands 3; then, they are locked by locking nuts 515. After removing the clamping seat 55, concrete can be poured into the joint area 11 to form the cast-in-place layer 2, which improves the connection stability of the overall structure.

[0040] Example 2: This application discloses a bidirectional composite plate joint connection structure.

[0041] The difference between the bidirectional composite plate joint connection structure disclosed in this application and Embodiment 1 is that: Reference Figure 7 In this embodiment, each mounting strip 51 is hinged with two second connecting rods 54. The second connecting rod 54 includes a first connecting segment 545 and a second connecting segment 546. One end of the first connecting segment 545 is fixedly connected to one end of the second connecting segment 546. A rotating shaft 543 is fixedly installed at the connection between the first connecting segment 545 and the second connecting segment 546. The rotating shaft 543 is rotatably mounted on the mounting strip 51, and the second connecting rod 54 is rotatably mounted on the mounting strip 51 through the rotating shaft 543.

[0042] The first connecting segment 545 is rotatably connected to a second abutment post 541 at the end away from the second connecting segment 546, and the second connecting segment 546 is rotatably connected to a third abutment post 542 at the end away from the first connecting segment 545. The second abutment posts 541 of the two second connecting rods 54 are respectively arranged on the inner side of the intersection of the two steel strands 3. When the first abutment post 52 tightens the steel strand 3, the steel strand 3 pushes the second connecting rod 54 through the second abutment post 541 and forces the third abutment post 542 to abut against the steel strand 3.

[0043] Reference Figure 8 , Figure 9 In this embodiment, the upper end of the first abutment post 52 is rotatably connected to the first connecting rod 53, and the outer diameter of the first abutment post 52 gradually increases from bottom to top; the upper end of the second abutment post 541 is rotatably connected to the first connecting section 545 of the second connecting rod 54, and the upper end of the third abutment post 542 is hinged to the second connecting section 546 of the second connecting rod 54, and the outer diameters of both the second abutment post 541 and the third abutment post 542 gradually decrease from bottom to top.

[0044] The implementation principle of Embodiment 2 of this application is as follows: The two mounting strips 51 are driven to move closer together, causing the two first abutment posts 52 to move closer together to tighten the steel strand 3. During this process, the steel strand 3 is pushed by the first abutment posts 52, which in turn pushes the second abutment post 541, thereby causing the second connecting rod 54 to rotate at a certain angle, so that the third abutment post 542 abuts against the steel strand 3. The first abutment post 52 and the third abutment post 542 force the steel strand 3 to form a greater torsional deformation at the part between the two mounting strips 51, thereby improving the tightening effect on the steel strand 3. Furthermore, the change in the outer diameter of the first abutment post 52 and the second abutment post 541 improves the clamping stability at the intersection of the two steel strands 3.

[0045] In addition, when the steel strand 3 is tightened, the third abutment post 542 abuts against the steel strand 3, which can reduce the bending amplitude at the connection between the steel strand 3 and the side wall of the precast base plate 1 (i.e., the position where the exposed section of the steel strand 3 is close to the side wall of the precast base plate 1), thereby reducing the damage to the steel strand 3 or the side wall of the precast base plate 1 during the tightening process.

[0046] Example 3: This application discloses a bidirectional composite plate joint connection structure.

[0047] The difference between the bidirectional composite plate joint connection structure disclosed in this application and Embodiment 2 is that: Reference Figure 10In this embodiment, both mounting strips 51 are provided with sliding rods 516. The two ends of the sliding rods 516 extend along the width direction of the joint area 11. The sliding rods 516 slide through the mounting strips 51. Each mounting strip 51 has an abutment strip 6 fixedly installed on the end face of the sliding rod 516 near the other mounting strip 51. The two ends of the abutment strip 6 extend along the length direction of the joint area 11. The abutment strip 6 is used to abut against the outer wall of the vertical rib 42. The abutment strip 6 is slidably installed on the mounting strip 51 via the sliding rods 516. The side wall of the abutment strip 6 has a relief groove 61 for avoiding the first connecting section 545. An elastic pad 62 is fixedly installed on the side wall of the mounting strip 51 near the vertical rib 42. The elastic pad 62 can be made of rubber.

[0048] The mounting strip 51 is provided with a pusher. When the first abutting post 52 tightens the steel strand 3, the pusher forces the abutting strip 6 to abut against the vertical rib 42. In this embodiment, the pusher is set as a pusher cam 544. The pusher cam 544 is fixedly installed on the outer peripheral wall of the rotating shaft 543. The pusher cam 544 and the second connecting rod 54 are arranged at intervals along the axial direction of the rotating shaft 543. The outer wall of the pusher cam 544 is used to push the abutting strip 6.

[0049] A support sleeve 7 is slidably fitted on the outer wall of the first connecting section 545. A support block 72 for abutting the vertical rib 42 is installed on the bottom wall of the support sleeve 7. A rotating rod 73 is fixedly installed on the support block 72 and is rotatably installed on the support sleeve 7. A return spring 71 is fitted on the outer side of the first connecting section 545. One end of the return spring 71 is fixedly connected to the support sleeve 7, and the other end is fixedly connected to the outer wall of the first connecting section 545. When the first abutting post 52 tightens the steel strand 3, the support block 72 of the support sleeve 7 abuts against the side of the vertical rib 42 away from the abutting strip 6.

[0050] The implementation principle of Embodiment 3 of this application is as follows: The two mounting strips 51 are driven to move closer together, causing the two first abutting posts 52 to move closer together, thereby tightening the steel strand 3. During the tightening process of the steel strand 3, the first abutting post 52 pushes the second connecting rod 54 to rotate through the second abutting post 541, causing the third abutting post 542 to abut against the steel strand 3, resulting in greater torsional deformation of the steel strand 3. Simultaneously, during the rotation of the second connecting rod 54, it pushes the abutting strip 6 by pushing the cam 544, causing the abutting strip 6 to press against the vertical reinforcement 42, thus improving the connection stability between the mounting strip 51 and the joint steel mesh 4.

[0051] In addition, during the rotation of the second connecting rod 54 around the rotating shaft 543, the support block 72 of the support sleeve 7 abuts against the side of the vertical rib 42 away from the abutting strip 6 to form a support effect on the vertical rib 42 and reduce the possibility of deformation of the vertical rib 42 due to the pushing of the abutting strip 6; the combination of the abutting strip 6 and the support sleeve 7 "hugs" the vertical rib 42 and improves the connection stability of the overall structure.

[0052] Example 4: This application also discloses a construction process for a two-way composite slab joint connection structure.

[0053] A construction process for a two-way composite slab joint connection structure specifically includes the following steps: S1. Fabrication of precast base plate 1.

[0054] S2. Installation of precast base plate 1: Transport the precast base plate 1 to the site and use a gantry crane to lift the precast base plate 1 to the design position, adjust the position and fix it so that the precast base plate 1 overlaps the building wall.

[0055] S3. Construction of joint reinforcement mesh 4: The joint reinforcement mesh 4 shall be constructed in the joint area 11.

[0056] S4. Casting of cast-in-place layer 2: A formwork is erected on the outside of the joint area 11 to form a casting space. Then, concrete is poured into the joint area 11. After the concrete solidifies, cast-in-place layer 2 is obtained.

[0057] The above are preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A bidirectional composite slab joint connection structure, characterized in that: The system includes a precast base plate (1) and a cast-in-place layer (2). The precast base plate (1) is provided with multiple precast base plates at intervals, and a joint area (11) for casting the cast-in-place layer (2) is formed between two adjacent precast base plates (1). The precast base plate (1) includes a main truss (12) and multiple reinforcing bars (13) set in the main truss (12). One end of the reinforcing bar (13) passes through the main truss (12) and extends into the joint area (11). Steel strands (3) are arranged in the main truss (12). The two ends of the steel strands (3) are respectively connected to the reinforcing bars (13) of the main truss (12). The middle part of the steel strands (3) extends into the joint area (11). The joint area (11) is provided with a hanging column (14) for hanging the steel strands (3).

2. The bidirectional composite slab joint connection structure according to claim 1, characterized in that: The cast-in-place layer (2) is provided with a joint steel mesh (4), which includes multiple horizontal bars (41) and vertical bars (42) arranged in a cross pattern. One end of the stressed steel bar (13) extends into the joint area (11) and is connected to the vertical bar (42). A tensioning mechanism (5) is provided on the joint steel mesh (4) to tighten the steel strands (3).

3. The bidirectional composite slab joint connection structure according to claim 2, characterized in that: The steel strands (3) of two adjacent precast base plates (1) are arranged in a cross pattern in the joint area (11). The tensioning mechanism (5) includes mounting strips (51), first abutment posts (52), and a drive assembly. Two mounting strips (51) are spaced apart in the joint area (11). The first abutment posts (52) are located between the two mounting strips (51). A first connecting rod (53) is provided between the first abutment post (52) and the two mounting strips (51). One end of the first connecting rod (53) is hinged. The first abutment post (52) is hinged to the mounting strip (51) at the other end; there are two first abutment posts (52), which are respectively arranged on the outside of the intersection of the two steel strands (3). When the two mounting strips (51) approach each other, the two first abutment posts (52) approach each other to tighten the steel strands (3) of the two adjacent precast base plates (1); the drive assembly is detachably connected to the mounting strip (51) to drive the two mounting strips (51) to approach each other.

4. The bidirectional composite slab joint connection structure according to claim 3, characterized in that: Each of the mounting strips (51) is connected to a guide rod (511), and the two ends of the guide rod (511) extend along the length direction of the horizontal rib (41); each mounting strip (51) has a guide groove (512) on its side wall, and the guide groove (512) is used for the guide rod (511) of another mounting strip (51) to pass through. The two mounting strips (51) are slidably connected by the guide rod (511); the guide rods (511) of the two mounting strips (51) are arranged at intervals along the height direction and form a through area (513) for the vertical rib (42) to pass through.

5. The bidirectional composite slab joint connection structure according to claim 3, characterized in that: Each of the mounting bars (51) is hinged with two second connecting rods (54). One end of the second connecting rod (54) is hinged with a second abutment post (541), and the other end is hinged with a third abutment post (542). The second abutment posts (541) of the two second connecting rods (54) are respectively arranged on the inner side of the intersection of the two steel strands (3). When the first abutment post (52) tightens the steel strand (3), the steel strand (3) pushes the second connecting rod (54) through the second abutment post (541) and forces the third abutment post (542) to abut against the steel strand (3).

6. The bidirectional composite slab joint connection structure according to claim 5, characterized in that: The upper end of the first abutment post (52) is hinged to the first connecting rod (53), and the outer diameter of the first abutment post (52) gradually increases from bottom to top; the upper end of the second abutment post (541) is hinged to the second connecting rod (54), and the outer diameter of the second abutment post (541) gradually decreases from bottom to top.

7. The bidirectional composite slab joint connection structure according to claim 5, characterized in that: Both mounting strips (51) are slidably mounted with abutment strips (6) for abutting the vertical rib (42) on their adjacent sidewalls. The mounting strips (51) are provided with pushers. When the first abutment post (52) tightens the steel strand (3), the pushers force the abutment strips (6) to press against the vertical rib (42).

8. The bidirectional composite slab joint connection structure according to claim 7, characterized in that: The second link (54) is provided with a rotating shaft (543), which is rotatably connected to the mounting strip (51). The second link (54) is hinged to the mounting strip (51) through the rotating shaft (543). The pusher includes a push cam (544), which is provided on the outer peripheral wall of the rotating shaft (543). The outer wall of the push cam (544) is used to push the abutment strip (6).

9. The bidirectional composite slab joint connection structure according to claim 7, characterized in that: The second connecting rod (54) includes a first connecting section (545) and a second connecting section (546) connected to each other. A second abutting post (541) is hinged to the first connecting section (545), and a third abutting post (542) is hinged to the second connecting section (546). A support sleeve (7) is slidably sleeved on the outer wall of the first connecting section (545), and a return spring (71) is provided between the support sleeve (7) and the first connecting section (545). When the first abutting post (52) tightens the steel strand (3), the support sleeve (7) abuts against the side of the vertical rib (42) away from the abutting bar (6).

10. A construction process for a bidirectional composite slab joint connection structure, based on the bidirectional composite slab joint connection structure according to any one of claims 1-9, comprising the following steps: S1. Fabrication of precast base plate (1); S2. Installation of precast base plate (1): Install the precast base plate (1) on site, adjust its position and fix it; S3. Fabrication of joint reinforcement mesh (4): The joint reinforcement mesh (4) is fabricated in the joint area (11); S4. Casting of cast-in-place layer (2).

Images