Pre-closed post-cast strip structure for basement roof slab and construction method

Abstract

The present application discloses a pre-closed post-cast strip structure for a basement top slab and a construction method, belonging to the field of underground top slab construction, including a reinforcement steel plate and a horizontal strut. A fastening connection device is fixedly connected to the reinforcement steel plate. The fastening connection device includes a base and a connecting frame. The base is rotatably installed on the reinforcement steel plate, and the connecting frame is fixedly installed on the base. A first half-threaded groove is formed on the connecting frame, and a reinforcement cover plate is also hinged on the connecting frame. A second half-threaded groove is formed on the reinforcement cover plate, and the first half-threaded groove and the second half-threaded groove cooperate with each other. The end of the horizontal strut can cooperate with the first half-threaded groove and the second half-threaded groove at the same time. A fixing mechanism for fixing the reinforcement cover plate is arranged on the connecting frame. The present application has the effect of facilitating the installation of the two ends of the horizontal strut on two reinforcement steel plates respectively.

Description

Technical Field

[0001] The present application relates to the field of underground roof construction, and in particular to a pre-closed post-cast belt structure for a basement roof and a construction method thereof. Background Art

[0002] In high-rise buildings, the high-rise main building and the low-rise podium are often connected together. Due to the large area of the basement, post-cast belts are provided to overcome harmful cracks caused by concrete shrinkage and foundation settlement.

[0003] Related technologies can refer to the Chinese invention patent application with the publication number CN107806114A, which discloses a pre-closed post-cast belt structure for a basement roof and a construction method thereof, including a side formwork structure for the pre-closed post-cast belt of the basement roof, a flush-type precast slab structure for the pre-closed post-cast belt of the basement roof, and a suspended formwork lifting and pouring structure for the pre-closed post-cast belt of the basement roof; the side formwork structure for the pre-closed post-cast belt of the basement roof includes a comb-shaped lattice skeleton, a diamond-shaped steel mesh, a wire dense mesh, a vertical reinforcement steel plate, a water stop steel plate, a horizontal strut, an inclined wire brace and a straight thread sleeve; the flush-type precast slab structure for the pre-closed post-cast belt of the basement roof includes post-cast belt main reinforcement, a ribbed upper precast slab, a foam board, a connecting screw, a deformation adjusting gasket and a hanging screw. The suspended formwork lifting and pouring structure for the pre-closed post-cast belt of the basement roof includes a ribbed upper precast slab, a hanging screw, a water stop ring, a ribbed lower precast slab, a pump pipe and a concrete pipe clip embedded part; the comb-shaped lattice skeleton connects the diamond-shaped steel mesh, the wire dense mesh and the water stop steel plate into a whole, the comb-shaped lattice skeleton is uniformly provided with vertical reinforcement steel plates, the upper and lower horizontal steel bars of the comb-shaped lattice skeleton are tied or welded to the post-cast belt main reinforcement, and the water stop steel plate is welded to the horizontal steel bar of the comb-shaped lattice skeleton; horizontal struts and inclined wire braces are arranged in the post-cast belt cavity, the horizontal struts and the inclined wire braces are propped against the vertical reinforcement steel plates, and straight thread sleeves are embedded on the vertical reinforcement steel plates to realize the tightening adjustment and fixation of the horizontal struts and the inclined wire braces.

[0004] In view of the above related technologies, the inventor believes that during the installation of the horizontal strut, it is necessary to first pass the horizontal strut through the intricate comb-shaped lattice skeleton, and then rotate the horizontal strut so that the two ends of the horizontal strut are sequentially installed on two right-angle thread sleeves, resulting in a greater difficulty in fixedly installing the horizontal strut. Summary of the Invention

[0005] In order to facilitate the installation of the horizontal strut between two vertical reinforcement steel plates, the present application provides a pre-closed post-cast belt structure for a basement roof and a construction method thereof.

[0006] In a first aspect, the pre-closed post-cast belt structure for a basement roof provided by the present application adopts the following technical solution:

[0007] The basement top plate pre-enclosed post-cast strip structure and construction method include a reinforcing steel plate and a horizontal brace, the reinforcing steel plate is fixedly connected with a fastening connection device, the fastening connection device includes a base and a connecting frame, the base is rotatably mounted on the reinforcing steel plate, and the connecting frame is fixedly mounted on the base;

[0008] The connecting frame is provided with a first half thread groove, the connecting frame is further hinged with a reinforcement cover plate, the reinforcement cover plate is provided with a second half thread groove, and the first half thread groove and the second half thread groove match each other;

[0009] The end of the horizontal support rod can be matched with the first half thread groove and the second half thread groove at the same time; the connecting frame is provided with a fixing mechanism for fixing the reinforcement cover plate.

[0010] By adopting the above technical solution, in order to facilitate the installation of the two ends of the horizontal support rod on the two reinforcement steel plates respectively, the horizontal support rod is first moved so that the two ends of the horizontal support rod are respectively matched with the connecting frame, and then the two reinforcement cover plates are respectively rotated, and under the action of the fixing mechanism, the reinforcement cover plates are connected to the connecting frame, thereby achieving the purpose of facilitating the installation of the two ends of the horizontal support rod on the two reinforcement steel plates respectively.

[0011] Preferably, a limiting groove is provided on the connecting frame, the fixing mechanism comprises a limiting block, a locking block and a sliding bar, and the connecting frame is further provided with a locking groove and a first sliding groove, and the first sliding groove is connected to the limiting groove;

[0012] The limit block is fixedly connected to the reinforcement cover plate, the limit block cooperates with the limit groove, the slide bar is slidably connected to the inner side wall of the first slide groove, and the locking block is fixedly connected to the slide bar; a locking groove is provided on the limit block, and the locking block cooperates with the locking groove; the fixing mechanism also includes a power component for driving the locking block to disengage from the locking groove.

[0013] By adopting the above technical solution, in the process of rotating the reinforced cover plate to make the limit block cooperate with the limit groove, the locking block is first pushed to move into the first slide groove by the power component, and then when the limit block is inserted into the insertion groove, the slide bar is pushed to move under the action of the power component, and the movement of the slide bar drives the locking block to move, so that the locking block is inserted into the locking groove, thereby achieving the purpose of facilitating the fixing of the limit block, and then achieving the purpose of facilitating the fixing of the reinforced cover plate.

[0014] Preferably, the connecting frame is further provided with a second slide slot, a third slide slot and a clearance hole, the second slide slot is connected to the first slide slot, and the clearance hole is connected to the second slide slot and the third slide slot at the same time;

[0015] The power assembly includes a first rack, a second rack, a gear, and a first spring. The first rack is slidably connected to the second chute, and the first rack is fixedly connected to the slide bar. The second rack is slidably connected to the inner side wall of the third chute, and one end of the second rack penetrates through the side wall of the third chute and is located outside the connecting frame. The gear is rotatably connected to the inner side wall of the relief hole, and both the first rack and the second rack are engaged with the gear. One end of the first spring is fixedly connected to the inner side wall of the second chute, and the other end of the first spring is fixedly connected to the first rack.

[0016] By adopting the above technical solution, when it is necessary to push the slide bar and the locking block to move, press the second rack to move. The movement of the second rack drives the gear to rotate, the rotation of the gear drives the first rack to move, and the movement of the first rack drives the slide bar to move. When no external force is applied to the slide bar, under the elastic force of the first spring, the first spring pulls the first rack to move, and the movement of the first rack drives the slide bar and the locking block to move, so as to achieve the purpose of facilitating the movement of the slide bar and the locking block.

[0017] Preferably, threads are provided at both ends of the horizontal support rod, and the threads at the ends of the horizontal support rod match the threads on the inner side walls of the first half-thread groove and the second half-thread groove. An inner cavity is provided inside the base, and a driving mechanism for driving the base to rotate is provided on the reinforcing steel plate. The driving mechanism includes a fixed ring and a driving torsion spring. The fixed ring is fixedly connected to the reinforcing steel plate, one end of the driving torsion spring is fixedly connected to the fixed ring, and the other end of the driving torsion spring is fixedly connected to the inner side wall of the inner cavity. A rotation limiting component for restricting the rotation direction of the base is also provided in the inner cavity.

[0018] By adopting the above technical solution, before the ends of the horizontal support rod are installed on the connecting frame, under the action of the rotation limiting component, the base can only rotate in one direction. After the ends of the horizontal support rod are installed on the connecting frame, the action of the rotation limiting component on the base is released, and then under the elastic force of the driving torsion spring, the driving torsion spring drives the base and the connecting frame to rotate, so as to achieve the purpose of further enhancing the connection strength between the connecting frame and the horizontal support rod.

[0019] Preferably, the rotation limiting component includes a cushion block, a lever, a rotating shaft, a convex block, and a second spring. A first through hole is provided on the base, and the first through hole is communicated with the inner cavity.

[0020] The cushion block is fixedly connected to the inner side wall of the inner cavity, and a second through hole is provided on the cushion block. The first through hole is communicated with the second through hole.

[0021] The rotating shaft is rotatably connected to the inner side wall of the first through hole. The lever is fixedly connected to the rotating shaft, and a return torsion spring is installed between the lever and the inner side wall of the first through hole;

[0022] There are multiple bump blocks. Corresponding to the multiple bump blocks, a plurality of relief grooves are formed on the fixed block. The multiple bump blocks are slidably connected to the inner walls of the multiple relief grooves one by one, and a gap is provided between two adjacent bump blocks. The bump blocks are all provided with inclined surfaces. The lever passes through the first through hole and the second through hole, and the lever can cooperate with the gap formed by the multiple bump blocks;

[0023] There are multiple second springs. The multiple second springs are arranged corresponding to the multiple bump blocks. One end of the second spring is fixedly connected to the relief groove, and the other end of the second spring is fixedly connected to the bump block; The base is further provided with a buckling component for pushing the lever.

[0024] By adopting the above technical solution, when it is necessary to limit the rotation direction of the base, first push the lever through the buckling component. The lever can cooperate with the gap formed by the multiple bump blocks. At this time, rotate the base in one direction. The lever contacts the inclined surface of the bump block, so that the lever can push the bump block to move into the relief groove to facilitate the rotation of the base; When the base is rotated in the reverse direction, the rotation direction of the lever is restricted under the action of the bump block and the lever; When the base is rotated in multiple directions, the action of the buckling component on the lever is released. At this time, under the action of the return torsion spring, the abutting rod rotates to the side away from the fixed ring, so that the abutting rod does not cooperate with the gap formed by the multiple bump blocks, so as to achieve the purpose of facilitating the rotation of the base in multiple directions.

[0025] Preferably, a fourth chute is formed on the base. The buckling component includes a push block and a third spring. The push block is slidably connected to the inner side wall of the fourth chute. One end of the third spring is fixedly connected to the inner side wall of the inner cavity, and the other end of the third spring is fixedly connected to the push block; The connecting frame is further provided with a fixing component for fixing the push block, and the base is further provided with a pushing component for pushing the push block to move.

[0026] By adopting the above technical solution, when it is necessary to push the lever to cooperate with the gap formed by the multiple bump blocks, first push the push block to move through the pushing component, and then fix the position of the push block under the action of the fixing component, so that the push block can always abut against the lever and push the end of the lever to cooperate with the gap formed by the multiple bump blocks; When the action of the fixing component on the push block is released, under the elastic force of the first spring, the push block is pulled to move in the direction away from the lever. At the same time, under the action of the return torsion spring, the lever no longer cooperates with the gap formed by the multiple bump blocks.

[0027] Preferably, the fixing component includes a fixing block, a fourth spring, and a pulling rope. A fourth sliding groove is further formed on the connecting frame. The fixing block is slidably connected to the inner side wall of the fourth sliding groove. A fixing groove is formed on the pushing block, and the fixing block is inserted and matched with the fixing groove. One end of the fourth spring is fixedly connected to the inner side wall of the fourth sliding groove, and the other end of the fourth spring is fixedly connected to the fixing block. One end of the pulling rope is fixedly connected to the first rack, and the pulling rope passes through the side wall of the second sliding groove and is fixedly connected to the fixing block.

[0028] By adopting the above technical solution, during the movement of the moving locking block, the movement of the locking block drives the movement of the first rack, the movement of the first rack drives the movement of the pulling rope, and the movement of the pulling rope drives the movement of the fixing block, so that the fixing block disengages from the fixing groove and is compressed at this time. When the locking block is inserted into the locking groove and the pushing block is pushed to move to a position where the fixing block is directly opposite to the fixing groove by the pushing component, the fixing block can be inserted into the fixing groove under the elastic force of the fourth spring, thereby achieving the purpose of facilitating the fixation of the pushing block.

[0029] Preferably, the pushing component includes a pushing rod and a pushing plate. One end of the pushing rod is fixedly connected to the pushing block, the other end of the pushing rod penetrates through the inner side wall of the fifth sliding groove and is located outside the base, and the pushing plate is fixedly connected to the end of the pushing rod located outside the base.

[0030] By adopting the above technical solution, when it is necessary to push the pushing block to move, the staff first pushes the pushing plate to move. The movement of the pushing plate drives the movement of the pushing rod, and the movement of the pushing rod drives the movement of the pushing block, thereby achieving the purpose of facilitating the movement of the pushing block.

[0031] On the other hand, the present application also provides a construction method for pre-closing the post-cast strip of the basement roof, adopting the following technical solution:

[0032] The structure and construction method of the pre-closing post-cast strip of the basement roof, the method includes the following steps:

[0033] Step 1, precast slab processing: Design the size of the precast slab according to the width of the post-cast strip of the project;

[0034] Step 2, after the main reinforcement of the post-cast strip is cleaned and tied, and after passing the hidden inspection and acceptance, start to close the post-cast strip;

[0035] Step 3, centrally process and weld the steel bar cage off-site, weld firmly, and segmentally weld into a steel bar grid. Its installation is to first construct the part below the waterstop steel plate;

[0036] Step 4, embed a straight thread sleeve on the vertical reinforcement steel plate, and fix the end of the wire anchor in the straight thread sleeve as an inclined wire brace pull rod; Add a horizontal brace at the post-cast strip, and fix the horizontal brace through a fastening connection device;

[0037] Step 5: After the steel bars of the side formwork structure of the post-cast strip on the basement top slab are bound and accepted, the precast slab is closed.

[0038] Step 6: Embed lifting and pulling screw rods in the precast slab. Both ends of the lifting and pulling screw rods are provided with threads, and a water stop ring is welded in the middle of the lifting and pulling screw rods.

[0039] Step 7: The pump pipes are made of thin-walled steel pipes. The pump pipes are firmly fixed by the concrete pipe clip embedded parts embedded in the precast slab under the ribbed slab. One pump pipe is set at every certain distance. After the verticality is corrected, the pump pipes are temporarily fixed with steel pipe diagonal braces. After being firmly fixed, the grooves between the pump pipes and the precast slab under the ribbed slab are sealed with cement mortar.

[0040] Step 8: Install the pouring pump pipes on the precast slab. After the pump pipes are firmly fixed, fix the pump pipes again with cement mortar.

[0041] Step 9: Manually backfill the soil around the pump pipes of the pouring hole and compact it layer by layer manually.

[0042] Step 10: Before the concrete is pumped and poured, open the reserved observation hole and wet the concrete and the formwork with water.

[0043] Step 11: Inject water into the concrete pouring pipe within 12 hours after the concrete is completed, and temporarily seal and cure the reserved jacking pouring holes in the precast slab under the ribbed slab with plastic sheets. At the same time, spray water from the gaps in the bottom formwork of the floor slab to keep the concrete moist for curing for at least 14 days. After the strength of the post-cast strip concrete reaches the strength of the original structural concrete, the formwork is removed.

[0044] In summary, the present application includes at least one of the following beneficial technical effects:

[0045] In order to facilitate the installation of the two ends of the horizontal strut on two reinforcement steel plates respectively, first move the horizontal strut so that the two ends of the horizontal strut are respectively matched with the connecting frame, and then rotate the two reinforcement covers respectively. Under the action of the fixing mechanism, the reinforcement covers are connected to the connecting frame, so as to achieve the purpose of facilitating the installation of the two ends of the horizontal strut on two reinforcement steel plates respectively;

[0046] In the process of rotating the reinforcement cover so that the limiting block is matched with the limiting groove, first push the locking block to move into the first sliding groove through the power assembly, and then when the limiting block is inserted into the insertion groove, then push the sliding bar to move under the action of the power assembly. The movement of the sliding bar drives the locking block to move, so that the locking block is inserted into the locking groove, so as to achieve the purpose of facilitating the fixation of the limiting block, and further achieve the purpose of facilitating the fixation of the reinforcement cover;

[0047] When it is necessary to push the lever to cooperate with the gaps formed by multiple bumps, first use the pushing component to push the pushing block to move, and then fix the position of the pushing block under the action of the fixing component, so that the pushing block can always abut against the lever and push the end of the lever to cooperate with the gaps formed by multiple bumps; when the action of the fixing component on the pushing block is released, under the elastic force of the first spring, the pushing block is pulled to move in a direction away from the lever, and at the same time, under the action of the reset torsion spring, the lever no longer cooperates with the gaps formed by multiple bumps. Brief Description of the Drawings

[0048] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present application.

[0049] Figure 2 is a schematic diagram of the structure of the prominent fastening connection device in an embodiment of the present application.

[0050] Figure 3 is a schematic diagram of the structure of the prominent fixing mechanism in an embodiment of the present application.

[0051] Figure 4 is a schematic diagram of the structure of the prominent driving mechanism in an embodiment of the present application.

[0052] Figure 5 is Figure 4 an enlarged view of part A in

[0053] Description of the reference numerals: 1, comb-shaped lattice skeleton; 11, diamond steel plate mesh; 12, wire dense mesh; 13, waterstop steel plate; 14, precast slab; 141, ribbed upper precast slab; 142, ribbed lower precast slab; 15, horizontal strut; 2, reinforcement steel plate; 3, fastening connection device; 31, base; 311, inner cavity; 312, first through hole; 313, fifth chute; 32, connecting frame; 321, first half-threaded groove; 322, limiting groove; 323, first chute; 324, second chute; 325, third chute; 326, fourth chute; 327, relief hole; 33, reinforcement cover plate; 331, second half-threaded groove; 4, fixing mechanism; 41, limiting block; 411, locking groove; 42, locking block; 43, sliding strip; 44, power component; 441, first rack; 442, second rack; 443, gear; 444, first spring; 5, driving mechanism; 51, fixing ring; 511, relief groove; 52, driving torsion spring; 53, rotation limiting component; 531, cushion block; 5311, second through hole; 532, lever; 533, rotating shaft; 534, bump; 535, second spring; 6, deduction component; 61, pushing block; 611, fixing groove; 62, third spring; 7, fixing component; 71, fixing block; 72, fourth spring; 73, pull rope; 8, pushing component; 81, pushing rod; 82, pushing plate. Detailed Description of the Embodiment

[0054] The following further elaborates on this application in conjunction with the attached drawings. Figures 1-5 This application embodiment discloses a pre - closed post - casting belt structure for a basement roof slab. Referring to

[0055] ..., the pre - closed post - casting belt structure for the basement roof slab includes a side formwork structure, a flat - type precast slab 14 structure, and a suspended formwork jacking and pouring structure; Figure 1 The side formwork structure includes a comb - type lattice - type skeleton 1, a diamond - shaped steel mesh 11, a wire fine - mesh 12, a reinforcing steel plate 2, a water - stop steel plate 13, a horizontal strut 15, an inclined wire bracing bar, and a straight - thread sleeve;

[0056] The flat - type precast slab 14 structure includes post - casting belt main reinforcement, a precast slab 14, a foam board, a connecting screw rod, a deformation adjustment gasket, and a hanging screw;

[0057] The suspended formwork jacking and pouring structure includes a precast slab 14, a hanging screw rod, a water - stop ring pump pipe, and a concrete pipe clamp embedded part.

[0058] The comb - type lattice - type skeleton 1 connects the diamond - shaped steel mesh 11, the wire fine - mesh 12, and the water - stop steel plate 13 into a whole. The comb - type lattice - type skeleton 1 is evenly vertically arranged with reinforcing steel plates 2. The upper and lower horizontal steel bars of the comb - type lattice - type skeleton 1 are tied or welded to the post - casting belt main reinforcement, and the water - stop steel plate 13 is welded to the horizontal steel bars of the comb - type lattice - type skeleton 1; In the post - casting belt cavity, a horizontal strut 15 and an inclined wire bracing bar are arranged. The horizontal strut 15 and the inclined wire bracing bar are propped against the reinforcing steel plate 2. Straight - thread sleeves are embedded on the reinforcing steel plate 2. At the same time, a fastening connection device 3 is also installed on the reinforcing steel plate 2. The fixation of the horizontal strut 15 is realized through the fastening connection device 3, and the top - tight adjustment and fixation are achieved through the straight - thread sleeve and the inclined wire bracing bar.

[0059] The precast slab 14 uses a ribbed upper precast slab 141. The ribbed upper precast slab 141 has rib beams, and the rib beams and the ribbed upper precast slab 141 are integrally precast; The foam board is fixed on the comb - type lattice - type skeleton 1. The two sides of the ribbed upper precast slab 141 are connected through reserved lapping steps with the foam board. The foam board is embedded with connecting screw rods, and deformation adjustment gaskets are arranged at the connecting screw rods. The ribbed upper precast slab 141 is fastened through the connecting screw rods;

[0060] The post - casting belt ribbed lower precast slab 142 is fixed through the hanging screw rods embedded in the ribbed upper precast slab 141. The ribbed lower precast slab 142 is tensioned and fastened with the ribbed upper precast slab 141 through the hanging screw rods. A water - stop ring is arranged in the middle of the hanging screw rods. The ribbed lower precast slab 142 is embedded with concrete pipe clamp embedded parts, and the pump pipe is fixed through the concrete pipe clamp embedded parts.

[0061] As shown in

[0062] Such as Figure 2As shown, the two end parts of the horizontal strut 15 are respectively connected to the fastening connection devices 3 on the two reinforcing steel plates 2 in a one-to-one correspondence.

[0063] The fastening connection device 3 includes a base 31, a connecting frame 32 and a reinforcing cover plate 33. The base 31 is rotatably installed on the reinforcing steel plate 2, the connecting frame 32 is fixedly installed on the base 31, and the reinforcing cover plate 33 is hinged to the connecting frame 32. In this application, the base 31 is a circular plate-like structure, and the connecting frame 32 and the reinforcing cover plate 33 are both rectangular block-like structures.

[0064] The connecting frame 32 is provided with a first half-thread groove 321, and the reinforcing cover plate 33 is provided with a second half-thread groove 331. The first half-thread groove 321 and the second half-thread groove 331 cooperate with each other. Threads are provided at both ends of the horizontal strut 15, and the threads at the end of the horizontal strut 15 match the threads on the inner side walls of the first thread groove and the second thread groove.

[0065] As Figure 2 and Figure 3 shown, the connecting frame 32 is provided with a limiting groove 322, a first sliding groove 323, a second sliding groove 324, a third sliding groove 325 and a relief hole 327. The limiting groove 322 communicates with one end of the first sliding groove 323, the second sliding groove 324 communicates with the other end of the first sliding groove 323, and the relief hole 327 communicates with both the second sliding groove 324 and the third sliding groove 325 at the same time.

[0066] A fixing mechanism 4 for fixing the reinforcing cover plate 33 is arranged on the connecting frame 32. The fixing mechanism 4 includes a limiting block 41, a locking block 42, a sliding strip 43 and a power assembly 44. The limiting block 41 is fixedly connected to the reinforcing cover plate 33, and the limiting block 41 is inserted and matched with the limiting groove 322. The space of the limiting groove 322 is slightly larger than that of the limiting block 41 to facilitate rotating the reinforcing cover plate 33 to drive the limiting block 41 to be inserted into the limiting groove 322. The sliding strip 43 is slidably connected to the side wall of the first sliding groove 323, and the locking block 42 is fixedly connected to the end of the sliding strip 43. An inclined surface is arranged on the top side of the locking block 42, and the inclined surface of the locking block 42 is inclined downward from the side close to the sliding strip 43 to the side away from the sliding strip 43. A locking groove 411 is arranged on the limiting block 41, and the locking block 42 is inserted and matched with the locking groove 411.

[0067] As Figure 2 and Figure 3As shown, the power assembly 44 includes a first rack 441, a second rack 442, a gear 443, and a first spring 444. The first rack 441 is fixedly connected to the end of the slide bar 43 away from the locking block 42, and the first rack 441 is slidably connected to the inner side wall of the second chute 324. The second rack 442 is slidably connected to the inner side wall of the third chute 325, and one end of the second rack 442 penetrates through the side wall of the third chute 325 and is located outside the connecting frame 32. The gear 443 is rotatably connected to the inner side wall of the relief hole 327, and the gear 443 meshes with both the first rack 441 and the second rack 442. One end of the first spring 444 is fixedly connected to the first rack 441, and the other end of the first spring 444 is fixedly connected to the inner side wall of the second chute 324.

[0068] As Figure 2 and Figure 3 shown, during the installation of the horizontal strut 15, first move the end of the horizontal strut 15 to the inside of the first half-threaded groove 321, and make the threads on the horizontal strut 15 match the threads on the first half-threaded groove 321. Then rotate the reinforcement cover plate 33 so that the reinforcement cover plate 33 drives the limiting block 41 to be inserted into the limiting groove 322. During the process of the limiting block 41 being inserted into the limiting groove 322, the end of the limiting block 41 can contact and push the locking block 42 to move. After the limiting block 41 is inserted into the limiting groove 322, under the elastic force of the first spring 444, the first rack 441, the slide bar 43, and the locking block 42 are pushed to move, so as to facilitate the insertion of the locking block 42 into the locking groove 411.

[0069] During the process of rotating the reinforcement cover plate 33 to disassemble the horizontal strut 15, press the second rack 442 so that the second rack 442 drives the gear 443 to rotate and the first rack 441 to move. The movement of the first rack 441 drives the slide bar 43 and the locking block 42 to move, so as to facilitate the driving of the locking block 42 to disengage from the locking groove 411. Then directly rotate the reinforcement cover plate 33.

[0070] As Figure 4 and Figure 5 shown, an inner cavity 311 is formed inside the base 31, and a driving mechanism 5 is installed on the reinforcement steel plate 2 in the inner cavity 311. The driving mechanism 5 includes a fixed ring 51 and a driving torsion spring 52. The fixed ring 51 is fixedly connected to the reinforcement steel plate 2, one end of the driving torsion spring 52 is fixedly connected to the inner side wall of the inner cavity 311, and the other end of the driving torsion spring 52 is fixedly connected to the reinforcement steel plate 2.

[0071] A rotation limiting assembly 53 for limiting the rotation direction of the base 31 is further provided in the inner cavity 311. The rotation limiting assembly 53 includes a cushion block 531, a lever 532, a rotating shaft 533, a convex block 534, and a second spring 535. The cushion block 531 is fixedly connected to the inner side wall of the inner cavity 311 away from the reinforcing steel plate 2. A first through hole 312 is formed in the inner side wall of the inner cavity 311, and a second through hole 5311 is formed in the cushion block 531.

[0072] As Figure 4 and Figure 5 shown, the rotating shaft 533 is rotatably installed on the inner side wall of the first through hole 312. One end of the lever 532 is fixedly connected to the rotating shaft 533, and the other end of the lever 532 passes through the first through hole 312 and the second through hole 5311 in sequence and is located in the inner cavity 311. A return torsion spring (not shown in the figure) is sleeved on the rotating shaft 533. One end of the return torsion spring is fixedly connected to the rotating shaft 533, and the other end of the return torsion spring is fixedly connected to the inner side wall of the first through hole 312. There are multiple convex blocks 534, and the multiple convex blocks 534 are evenly distributed along the circumferential direction of the fixed ring 51. A plurality of relief grooves 511 are formed in the fixed ring 51 corresponding to the multiple convex blocks 534, and the multiple convex blocks 534 are slidably connected to the inner side walls of the multiple relief grooves 511 in a one-to-one correspondence. There are multiple second springs 535, and the second springs 535 are correspondingly arranged in the multiple relief grooves 511. One end of the second spring 535 is fixedly connected to the convex block 534, and the other end of the second spring 535 is fixedly connected to the inner side wall of the relief groove 511.

[0073] A gap is formed between two adjacent convex blocks 534, and the gap formed between the end of the lever 532 located in the inner cavity 311 and the multiple convex blocks 534 is matched. A slope is provided on the convex block 534, and the slope of the convex block 534 is inclined upward from the side close to the fixed ring 51 to the side away from the fixed ring 51. A slope is provided on one side of the lever 532, and the slope of the lever 532 is inclined downward from the end close to the rotating shaft 533 to the end away from the rotating shaft 533. The base 31 is further provided with a deduction assembly 6 for pushing the lever 532.

[0074] When the lever 532 is pushed by the deduction assembly 6 so that the lever 532 can cooperate with the gap formed by the multiple convex blocks 534, when the base 31 is rotated in one direction, the lever 532 contacts the slope of the convex block 534, so that the lever 532 can push the convex block 534 to move into the relief groove 511 to facilitate the rotation of the base 31; when the base 31 is rotated in the reverse direction, the rotation direction of the lever 532 is restricted by the convex block 534 and the lever 532.

[0075] When it is necessary to rotate the base 31 in multiple directions, the effect of the buckle assembly 6 on the lever 532 is released. At this time, under the action of the reset torsion spring, the lever rotates to the side away from the fixing ring 51, so that the lever does not cooperate with the gap formed by the multiple protrusions 534, thereby achieving the purpose of facilitating the rotation of the base 31 in multiple directions.

[0076] like Figure 4 and Figure 5 As shown, the base 31 is further provided with a fourth slide groove 326 , which is communicated with the first through hole 312 , and the connecting frame 32 is further provided with a fifth slide groove 313 , which is communicated with the first through hole 312 .

[0077] like Figure 5 As shown, the buckle assembly 6 includes a push block 61 and a third spring 62. The push block 61 is slidably connected to the inner side wall of the fourth slide groove 326. The push block 61 is provided with an inclined surface on the side close to the lever 532, and the inclined surface of the lever 532 is inclined downward from the side away from the fixing ring 51 to the side close to the fixing ring 51. One end of the third spring 62 is fixedly connected to the inner side wall of the inner cavity 311, and the other end of the third spring 62 is fixedly connected to the push block 61.

[0078] like Figure 5 As shown, a pushing assembly 8 is also provided on the base 31, and the pushing assembly 8 includes a pushing rod 81 and a pushing plate 82. One end of the pushing rod 81 is fixedly connected to the pushing block 61, and the other end of the pushing rod 81 passes through the inner wall of the fifth sliding groove 313 and is located on the outside of the base 31. The pushing plate 82 is fixedly connected to the end of the pushing rod 81 located on the outside of the base 31.

[0079] like Figure 5 As shown, the connecting frame 32 is also provided with a fixing component 7, which includes a fixing block 71, a fourth spring 72 and a pull rope 73. The fixing block 71 is slidably connected to the inner wall of the fourth slide groove 326, and a fixing groove 611 is provided on the push block 61. The fixing block 71 is plugged into the fixing groove 611; one end of the fourth spring 72 is fixedly connected to the inner wall of the fourth slide groove 326, and the other end of the fourth spring 72 is fixedly connected to the fixing block 71; one end of the pull rope 73 is fixedly connected to the first rack 441, and the pull rope 73 passes through the side wall of the second slide groove 324 and is fixedly connected to the fixing block 71, and the pull rope 73 can move during the connection.

[0080] like Figure 3 , Figure 4 as well as Figure 5As shown in the figure, before installing the horizontal brace 15, push the push rod 81 and the push plate 82. The movement of the push rod 81 drives the movement of the push block 61. The movement of the push block 61 drives the rotation of the lever 532, so that the gap formed by the end of the lever 532 and the multiple bumps 534 is matched. During the movement of the push block 61, when the fixing groove 611 is aligned with the fixing block 71, under the elastic force of the fourth spring 72, the fixing block 71 can be inserted into the fixing groove 611, so as to achieve the purpose of fixing the push block 61. Here, the elastic coefficient of the fourth spring 72 is much smaller than that of the first spring 444.

[0081] During the installation of the horizontal brace 15, the limit block 41 can push the locking block 42 to move. The movement of the locking block 42 drives the movement of the slide bar 43, the first rack 441, the pull rope 73 and the fixing block 71, so that the fixing block 71 is separated from the fixing groove 611. At this time, under the elastic force of the third spring 62, the push block 61 is pulled to move. Then, under the action of the reset torsion spring, the lever 532 rotates, and the end of the lever 532 is no longer matched with the gap formed by the multiple bumps 534. Then, under the action of the driving torsion spring 52, the driving base 31 rotates. The rotation of the driving base 31 drives the rotation of the connecting frame 32, and the rotation of the connecting frame 32 increases the connection strength between the horizontal brace 15 and the connecting frame 32.

[0082] This application also discloses a construction method for pre-closing the post-cast strip of the basement roof slab. Refer to Figure 1 , including the following construction steps,

[0083] Step 1: Design the size of the precast slab 14 according to the width of the post-cast strip of the project. The precast slab 14 is provided with rib beams, and 90° hooks are arranged at the ends of the steel bars. The precast slab 14 is divided into a ribbed upper precast slab 141 and a ribbed lower precast slab 142. The ribbed lower precast slab 142 has a pouring port in the center of the slab.

[0084] Step 2: After the main bars of the post-cast strip are cleaned and tied, and the hidden inspection and acceptance are qualified, the post-cast strip is closed.

[0085] Step 3: Concentrate on off-site processing and welding of the steel bar framework. Weld firmly and weld it into a steel bar grid in sections. First, construct the part below the waterstop steel plate 13 during installation. After the framework is welded, first lay a diamond steel plate mesh 11 as a reinforcement measure, and then lay a steel wire dense mesh 12, and tie them firmly to the framework steel bars with wire respectively; arrange the reinforcement steel plates 2 vertically and evenly on the outside of the comb-shaped lattice framework 1. The waterstop steel plate 13 is lapped and connected with the framework and spot-welded firmly to the comb-shaped lattice framework 1. After the installation of the waterstop steel plate 13 is completed, the upper comb-shaped lattice framework 1 and the steel wire dense mesh 12 can be welded and tied.

[0086] Step 4, embed straight thread sleeves in the reinforced steel plate 2, and use iron wires to be anchored in the straight thread sleeves as diagonal iron wire bracing bars to pull the outer framework of the post-cast strip to generate tension to offset part of the lateral pressure. The steel bar supports added at the post-cast strip serve as the horizontal bracing bars 15 and also as the supports for the waterstop steel plate 13;

[0087] Step 5, after the steel bars of the side formwork structure of the pre-closed post-cast strip on the basement roof are tied and inspected, the ribbed precast slab 141 is closed; the foam board is fixed on the comb-shaped lattice framework 1, and both sides of the ribbed precast slab 141 are connected to the reserved overlapping steps of the foam board. The foam board is embedded with connecting screws, and at the connecting screws;

[0088] Set deformation adjustment gaskets, and fasten the ribbed precast slab 141 through the connecting screws to achieve the early pre-closure of the post-cast strip;

[0089] Step 6, embed lifting and pulling screws in the ribbed precast slab 141. Small holes that can pass through the lifting and pulling screws are drilled in the ribbed precast slab 141 in advance according to the designed quantity and positions of the lifting and pulling screws. One end of the lifting and pulling screw is first connected and fixed to the screw with a nut and a U-shaped clamp. Both ends of the lifting and pulling screw are provided with threads, and a waterstop ring is welded in the middle of the lifting and pulling screw;

[0090] Step 7, the ribbed lower precast slab 142 is positioned on the ground of the basement according to the position of the lifting ropes, and then the lifting ropes are bound and connected to the hooked steel bars on the ribbed lower precast slab 142. The ribbed lower precast slab 142 is pulled up above the post-cast strip through a rope. The bolt holes on the ribbed lower precast slab 142 are aligned with the lifting and pulling screws. After the lifting and pulling screws pass through the ribbed lower precast slab 142, the U-shaped clamp and nut at the lower end of the lifting and pulling screw can be installed;

[0091] Step 8, the pump pipes are made of thin-walled steel pipes. The pump pipes are firmly fixed by the concrete pipe clamp embedded parts pre-embedded in the ribbed lower precast slab 142. One pump pipe is set at every certain distance. After the verticality is corrected, the pump pipes are temporarily fixed with steel pipe diagonal braces. After being firmly fixed, the grooves between the pump pipes and the ribbed lower precast slab 142 are filled and sealed with cement mortar;

[0092] Step 9, use manual shoveling to backfill the soil around the pump pipes of the pouring holes, and compact it layer by layer manually;

[0093] Step 10, before the concrete is pumped and poured, open the reserved observation holes and fill them with water to moisten the concrete and the formwork; the concrete pump pipes are laid along the post-cast strip in advance, and the pipes are removed during the construction by retreating from far to near; when the concrete is jacked up at each post-cast strip jacking connection port, if it is found that the concrete flows out of the adjacent connection port, the pumping is stopped; during the concrete jacking process, measure the pouring height of the concrete at the inverted beam to determine whether the concrete meets the pouring height requirements. The pumping and jacking pouring are carried out continuously, and the interruption time does not exceed 30 minutes;

[0094] Step 11: Inject water into the concrete pouring pipe within 12 hours after the concrete is completed, and temporarily seal and cure the reserved jacking and pouring holes in the precast slab 142 with ribs using plastic sheets. At the same time, spray water through the gaps in the floor bottom formwork to keep the concrete moist for at least 14 days. Remove the formwork after the strength of the post-cast strip concrete reaches the strength of the original structural concrete.

[0095] The above are all preferred embodiments of this application. The protection scope of this application is not limited hereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. The pre-enclosed post-cast strip structure of the basement top slab includes a reinforcing steel plate (2) and a horizontal support rod (15). Features: A fastening connection device (3) is fixedly connected to the reinforcing steel plate (2), and the fastening connection device (3) comprises a base (31) and a connecting frame (32), the base (31) is rotatably mounted on the reinforcing steel plate (2), and the connecting frame (32) is fixedly mounted on the base (31); The connecting frame (32) is provided with a first half thread groove (321), the connecting frame (32) is further hinged with a reinforcement cover plate (33), the reinforcement cover plate (33) is provided with a second half thread groove (331), and the first half thread groove (321) and the second half thread groove (331) are matched with each other; The end of the horizontal support rod (15) can be matched with the first half thread groove (321) and the second half thread groove (331) at the same time; the connecting frame (32) is provided with a fixing mechanism (4) for fixing the reinforcement cover plate (33); The connecting frame (32) is provided with a limiting groove (322), the fixing mechanism (4) comprises a limiting block (41), a locking block (42) and a sliding bar (43), the connecting frame (32) is also provided with a locking groove (411) and a first sliding groove (323), and the first sliding groove (323) is connected to the limiting groove (322); The limit block (41) is fixedly connected to the reinforcement cover plate (33), the limit block (41) cooperates with the limit groove (322), the slide bar (43) is slidably connected to the inner side wall of the first slide groove (323), and the locking block (42) is fixedly connected to the slide bar (43); a locking groove (411) is provided on the limit block (41), and the locking block (42) cooperates with the locking groove (411); the fixing mechanism (4) also includes a power assembly (44) for driving the locking block (42) to disengage from the locking groove (411).

2. The basement top slab pre-enclosed post-cast strip structure according to claim 1, Features: The connecting frame (32) is further provided with a second slide groove (324), a third slide groove (325) and a clearance hole (327), wherein the second slide groove (324) is connected to the first slide groove (323), and the clearance hole (327) is simultaneously connected to the second slide groove (324) and the third slide groove (325); The power assembly (44) includes a first rack (441), a second rack (442), a gear (443), and a first spring (444). The first rack (441) is slidably connected to the second chute (324), and the first rack (441) is fixedly connected to the slide bar (43). The second rack (442) is slidably connected to the inner side wall of the third chute (325), and one end of the second rack (442) penetrates through the side wall of the third chute (325) and is located outside the connecting frame (32). The gear (443) is rotatably connected to the inner side wall of the relief hole (327), and both the first rack (441) and the second rack (442) are engaged with the gear (443). One end of the first spring (444) is fixedly connected to the inner side wall of the second chute (324), and the other end of the first spring (444) is fixedly connected to the first rack (441).

3. The pre-closed post-cast strip structure for the basement top slab according to claim 2, characterized in that: Both ends of the horizontal strut (15) are provided with threads, and the threads at the ends of the horizontal strut (15) match the threads on the inner side walls of the first half-thread groove (321) and the second half-thread groove (331). An inner cavity (311) is formed inside the base (31). A driving mechanism (5) for driving the base (31) to rotate is provided on the reinforcing steel plate (2). The driving mechanism (5) includes a fixing ring (51) and a driving torsion spring (52). The fixing ring (51) is fixedly connected to the reinforcing steel plate (2). One end of the driving torsion spring (52) is fixedly connected to the fixing ring (51), and the other end of the driving torsion spring (52) is fixedly connected to the inner side wall of the inner cavity (311). A rotation limiting component (53) for limiting the rotation direction of the base (31) is further provided in the inner cavity (311).

4. The pre-closed post-cast strip structure for the basement top slab according to claim 3, characterized in that: The rotation limiting component (53) includes a cushion block (531), a lever (532), a rotating shaft (533), a convex block (534), and a second spring (535). A first through hole (312) is formed in the base (31), and the first through hole (312) communicates with the inner cavity (311). The cushion block (531) is fixedly connected to the inner side wall of the inner cavity (311). A second through hole (5311) is formed in the cushion block (531), and the first through hole (312) communicates with the second through hole (5311). The rotating shaft (533) is rotatably connected to the inner side wall of the first through hole (312). The lever (532) is fixedly connected to the rotating shaft (533). A return torsion spring is installed between the lever (532) and the inner side wall of the first through hole (312). There are multiple bumpers (534). Corresponding to the multiple bumpers (534), a plurality of relief grooves (511) are formed in the fixed block (71). The multiple bumpers (534) are slidably connected to the inner walls of the multiple relief grooves (511) in a one-to-one correspondence, and a gap is provided between two adjacent bumpers (534). The bumpers (534) are each provided with an inclined surface. The lever (532) passes through the first through hole (312) and the second through hole (5311), and the lever (532) can cooperate with the gap formed by the multiple bumpers (534); There are multiple second springs (535). The multiple second springs (535) are arranged in one-to-one correspondence with the multiple bumpers (534). One end of the second spring (535) is fixedly connected to the relief groove (511), and the other end of the second spring (535) is fixedly connected to the bumper (534); The base (31) is further provided with a deduction assembly (6) for pushing the lever (532).

5. The pre-closed post-cast belt structure of the basement roof slab according to claim 4, characterized in that: A fourth chute (326) is formed in the base (31). The deduction assembly (6) includes a push block (61) and a third spring (62). The push block (61) is slidably connected to the inner side wall of the fourth chute (326). One end of the third spring (62) is fixedly connected to the inner side wall of the inner cavity (311), and the other end of the third spring (62) is fixedly connected to the push block (61); The connecting frame (32) is further provided with a fixing assembly (7) for fixing the push block (61), and the base (31) is further provided with a pushing assembly (8) for pushing the push block (61) to move.

6. The pre-closed post-cast belt structure of the basement roof slab according to claim 5, characterized in that: The fixing assembly (7) includes a fixing block (71), a fourth spring (72) and a pulling rope (73). A fourth chute (326) is further formed in the connecting frame (32). The fixing block (71) is slidably connected to the inner side wall of the fourth chute (326). A fixing groove (611) is formed in the push block (61). The fixing block (71) is inserted and matched with the fixing groove (611); One end of the fourth spring (72) is fixedly connected to the inner side wall of the fourth chute (326), and the other end of the fourth spring (72) is fixedly connected to the fixing block (71); One end of the pulling rope (73) is fixedly connected to the first rack (441), and the pulling rope (73) passes through the side wall of the second chute (324) and is fixedly connected to the fixing block (71).

7. The pre-closed post-cast belt structure of the basement roof slab according to claim 5, characterized in that: The pushing component (8) includes a push rod (81) and a push plate (82). One end of the push rod (81) is fixedly connected to the push block (61), the other end of the push rod (81) penetrates the inner side wall of the fifth sliding groove (313) and is located outside the base (31), and the push plate (82) is fixedly connected to the end of the push rod (81) located outside the base (31).

8. Construction method for pre-closed post-cast strip of basement roof, based on the pre-closed post-cast strip structure of basement roof as described in claim 1 Characterized in that The method comprises the following steps: Step 1, precast slab (14) processing: Design the size of the precast slab (14) according to the width of the post-cast strip of the project Step 2, after the main reinforcement of the post-cast strip is cleaned and tied, start the closure of the post-cast strip after passing the concealed inspection and acceptance Step 3, centrally process and weld the steel bar framework off-site, weld firmly, and segmentally weld into a steel bar grid, and install the part below the water stop steel plate (13) first Step 4, embed straight thread sleeves on the vertical reinforcement steel plate (2), and fix the end of the wire anchor in the straight thread sleeve as an inclined wire bracing bar; add a horizontal bracing bar (15) at the post-cast strip, and fix the horizontal bracing bar (15) through the fastening connection device (3) Step 5, after the steel bars of the side formwork structure of the pre-closed post-cast strip of the basement roof are tied and accepted, carry out the closure of the precast slab (14) Step 6, embed lifting and pulling screw rods in the precast slab (14), the two ends of the lifting and pulling screw rods are provided with threads, and a water stop ring is welded in the middle of the lifting and pulling screw rods Step 7, the pump pipe adopts a thin-walled steel pipe, and the pump pipe is firmly fixed by the concrete pipe clamp embedded parts embedded in the precast slab (14). A pump pipe is arranged at a certain distance. After the verticality is corrected, the pump pipe is temporarily fixed with a steel pipe diagonal brace. After being firmly fixed, use cement mortar to embed the groove between the pump pipe and the precast slab (14) to death Step 9, backfill the soil around the pump pipe of the pouring hole manually, and tamp it layer by layer manually Step 10, before the concrete is pumped and poured, open the reserved observation hole, and irrigate water to moisten the concrete and the formwork Step 11, inject water into the concrete pouring pipe within 12 hours after the concrete is completed, and temporarily seal and maintain the reserved jacking and pouring holes of the precast slab (14) with plastic cloth; at the same time, spray water from the gap of the floor bottom formwork to keep the concrete moist for at least 14 days; remove the formwork after the strength of the post-cast strip concrete reaches the strength of the original structure concrete

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