Supporting tool for improving flatness of laminated slab joint

Abstract

The utility model discloses a kind of support toolings for improving the flatness of laminated slab joint, belong to building construction technical field, including being set below adjacent laminated slab joint and with the pouring formwork of laminated slab bottom adhesion, further include truss above joint and vertically be provided in the pull rod assembly of truss;The pull rod assembly includes first connecting portion and second connecting portion sequentially arranged from top to bottom, adjusting nut for compacting in the top surface of truss is threadedly connected on the first connecting portion, the bottom of second connecting portion is provided with the chucking mechanism that can be radially opened and closed.This support tooling for improving the flatness of laminated slab joint, by setting truss across joint and vertical pull rod assembly, all installation, fastening action is concentrated on floor slab and is carried out, construction personnel need not enter the narrow space below formwork, standing on floor can complete the installation and debugging of entire tooling, eliminate the operation difficulty caused by bottom pillar.

Description

Technical Field

[0001] This utility model belongs to the field of building construction technology, and in particular relates to a support fixture for improving the flatness of composite slab joints. Background Technology

[0002] With the widespread application of prefabricated building technology, precast composite slabs have become the mainstream choice for floor slab systems due to their advantages such as convenient construction, energy saving, and environmental protection. In actual construction, post-pouring strip joints are left between adjacent composite slabs, which need to be connected into a whole by casting concrete in place using formwork. Currently, the formwork construction for this joint generally adopts the method of erecting casting formwork and independent steel columns at the bottom of the composite slab for support.

[0003] However, during concrete pouring, the composite slab experiences slight upward displacement due to the buoyancy of the newly poured concrete, resulting in gaps between the composite slab and the bottom formwork. These gaps are the root cause of concrete leakage at the joint. Leakage not only affects the density and appearance of the concrete at the joint, leading to insufficient strength and honeycomb-like surface defects, but also prevents this area from achieving the same plaster-free effect as the precast composite slab, requiring secondary repairs and increasing labor and material costs. To address this issue, an improved solution, as described in Chinese patent document CN217079661U, has emerged in the prior art. This solution utilizes a bridging system formed by fasteners and stops, operated from below the formwork to tighten the formwork and composite slab, thereby reducing leakage and enhancing joint strength.

[0004] Although the above-mentioned improvement scheme has achieved certain results, its core drawback is that the process of installing and fastening the fasteners requires rotation operations under the template. Since the template is filled with a dense steel support system, the operating space for construction workers is extremely small and limited. This not only makes the installation process very inconvenient and inefficient, but also makes it difficult to ensure that each fastener achieves the expected fastening effect in a dim and crowded environment, thus affecting the reliability and universality of the technical solution.

[0005] To address this issue, we propose a support fixture to improve the flatness of the joints of composite slabs. Utility Model Content

[0006] The purpose of this utility model is to solve the problem that in the prior art, the process of installing and fastening the fasteners requires rotation operation under the template, and the operating space of the construction personnel is extremely narrow and limited. Therefore, a support fixture for improving the flatness of the joints of composite slabs is proposed.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A support fixture for improving the flatness of composite slab joints includes a casting template disposed below the joints of adjacent composite slabs and attached to the bottom of the composite slabs, and also includes a truss spanning above the joints and a tie rod assembly vertically passing through the truss.

[0009] The tie rod assembly includes a first connecting part and a second connecting part arranged sequentially from top to bottom. The first connecting part and the second connecting part are detachably connected. An adjusting nut for pressing against the top surface of the truss is threaded onto the first connecting part. A radially opening and closing clamping mechanism is provided at the bottom of the second connecting part. The clamping mechanism can pass through the perforation on the casting template and automatically open after being fully inserted. The tie rod assembly is lifted by tightening the adjusting nut, so that the clamping mechanism is pressed against the bottom surface of the casting template.

[0010] Preferably, the clamping mechanism includes a slide rod fixedly connected to the second connecting part, a sleeve slidably sleeved outside the slide rod, and a plurality of support rods rotatably connected to the outside of the sleeve. The slide rod is threaded with a positioning nut for locking the axial position of the sleeve, and the plurality of support rods have an outwardly opening umbrella-shaped structure in the initial state.

[0011] Preferably, the outer wall of the sleeve is provided with a plurality of side grooves along the circumference, and the support rod is rotatably connected to the two side walls of the side grooves through a rotating shaft. The rotating shaft is provided with a torsion spring that drives the support rod to remain in an open state.

[0012] Preferably, the inner wall of the side groove is further provided with a sliding groove, and the middle part of the support rod is movably connected to the sliding groove through a connecting rod; when the support rod is subjected to a thrust towards the sleeve side, the connecting rod slides in the sliding groove and causes the support rod to retract inward around the pivot axis.

[0013] Preferably, the end of the support rod that contacts the bottom surface of the casting template is provided with an anti-slip structure.

[0014] Preferably, the anti-slip structure is a serration formed at the end of the strut.

[0015] Preferably, a limiting block is provided at one end of the second connecting part near the sleeve, and the side groove can cooperate with the limiting block so that the sleeve and the second connecting part are fixed in the circumferential direction and cannot rotate relative to each other.

[0016] Preferably, the first connecting part and the second connecting part are coaxially connected by threads, and the connection between the first connecting part and the second connecting part is located below the cast-in-place concrete layer.

[0017] In summary, the technical effects and advantages of this utility model are as follows:

[0018] This utility model, by setting up a truss spanning the joint and a vertical tie rod assembly, concentrates all installation and fastening actions on the floor slab. Construction workers do not need to enter the narrow space under the formwork; they can complete the installation and debugging of the entire fixture while standing on the floor. This eliminates the operational difficulties caused by numerous bottom supports, improves construction efficiency and safety, and ensures the controllability of operational quality.

[0019] This invention features a tie rod assembly that automatically opens after passing through the perforation in the template, forming a reliable barb. By tightening the adjusting nut at the top, a strong vertical lifting force is generated, causing the support rod to press tightly against the bottom surface of the template. This applies pre-tightening force to the template before concrete pouring, effectively eliminating gaps caused by the floating of the composite slab and preventing grout leakage. The serrated anti-slip structure at the end of the support rod, in conjunction with the anti-rotation mechanism composed of the limiting block and sleeve, ensures that the tie rod assembly as a whole will not rotate when the adjusting nut is tightened. This allows all rotational torque to be effectively converted into axial lifting force, avoiding "slippage and free rotation" and ensuring the reliability of the fastening effect.

[0020] This utility model's tie rod assembly adopts a split design. The first connecting part is pre-embedded in the cast-in-place layer to enhance the joint strength, while the second connecting part and the clamping mechanism are detachable and reusable. In particular, by loosening the positioning nut, the sleeve can be axially slid, releasing the engagement between the strut teeth and the bottom surface of the formwork. This reduces the rotational resistance when subsequently removing the second connecting part, making the disassembly process easy and quick, protecting the component from damage, extending its service life, and reducing overall project costs. Attached Figure Description

[0021] Figure 1 This is a structural diagram of the present invention in its application state;

[0022] Figure 2 This is a schematic diagram of the appearance and structure of this utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the second connecting part in this utility model;

[0024] Figure 4 This is a schematic diagram of the sleeve structure in this utility model.

[0025] In the diagram: 1. Composite slab; 2. Casting template; 3. Truss; 4. First connecting part; 5. Second connecting part; 51. Limiting block; 6. Adjusting nut; 7. Clamping mechanism; 71. Sliding rod; 72. Sleeve; 721. Side groove; 722. Sliding groove; 73. Support rod; 731. Rotating shaft; 732. Sawtooth; 74. Positioning nut; 75. Connecting rod. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0027] Reference Figure 1-4 This utility model provides a support fixture for improving the flatness of composite slab joints. Its core function is to solve the problem of operating in a confined space below the formwork in existing technologies. This fixture is mainly used for concrete pouring at the joints of post-cast strips between adjacent composite slabs 1. It includes a pouring formwork 2 set below the joint of adjacent composite slabs 1 and attached to the bottom of the composite slab 1, supported by an independent steel column (not shown in the figure) below.

[0028] The key is the installation of a truss 3 spanning above the joint. The truss 3 is preferably a steel beam with both ends directly overlapping the top surface of the composite plates 1 on both sides, providing a stable and reliable top support foundation for the entire support fixture. A set of tie rods is vertically installed above the truss 3.

[0029] Reference Figure 1-4 The pull rod assembly adopts a split design, including a first connecting part 4 and a second connecting part 5 arranged sequentially from top to bottom. The first connecting part 4 and the second connecting part 5 are detachably connected. Specifically, the first connecting part 4 and the lower second connecting part 5 are coaxially connected by threads.

[0030] The connection between the first connecting part 4 and the second connecting part 5 is located below the top surface of the final cast-in-place concrete layer. This ensures that the second connecting part 5 can be easily unscrewed and disassembled after the concrete is poured. The first connecting part 4, on the other hand, remains permanently embedded in the cast-in-place concrete. The first connecting part 4 embedded in the concrete not only does not affect the structural safety, but also acts as a tie bar, which helps to enhance the integrity of the joint area. An adjusting nut 6 is threaded onto the rod of the first connecting part 4. The adjusting nut 6 is located above the truss 3. By tightening the adjusting nut 6, its lower surface can be pressed tightly against the top surface of the truss 3, thereby generating an upward lifting force.

[0031] Reference Figure 1-4To enable installation and fastening from above the casting template 2, a radially opening and closing clamping mechanism 7 is provided at the bottom of the second connecting part 5. The specific structure of the clamping mechanism 7 includes a slide rod 71 fixedly connected to the lower end of the second connecting part 5, a sleeve 72 slidably sleeved outside the slide rod 71, and its axial position can be locked by a positioning nut 74 threaded to the slide rod 71. Multiple support rods 73 are rotatably connected to the side of the sleeve 72 through a rotating shaft 731. More specifically, multiple side grooves 721 are evenly opened circumferentially on the outer wall of the sleeve 72. Each support rod 73 is installed in the corresponding side groove 721 through the rotating shaft 731 at its root. To ensure that the support rod 73 can automatically remain open when not under force, a torsion spring (not shown in the figure) is sleeved on the rotating shaft 731. The spring provides a continuous outward opening torque for the support rod 73, so that multiple support rods 73 naturally form an outward opening umbrella-shaped structure in the initial state.

[0032] Reference Figure 1-4 To enable the umbrella-shaped structure to pass smoothly through the pre-set holes in the casting template 2 and to automatically close and open, this invention also provides a sliding groove 722 on the inner wall of each side groove 721. The middle part of each support rod 73 is movably connected to the sliding groove 722 via a connecting rod 75. Specifically, one end of the connecting rod 75 is hinged to the support rod 73, and the other end has a cylinder embedded in the sliding groove 722. When the construction worker holds the pull rod assembly and inserts it downwards into the hole of the casting template 2, the end of the support rod 73 (equivalent to an umbrella) opens and closes. The tip will first contact the edge of the perforation and continue to press down. The edge of the perforation will exert a pushing force on the support rod 73 towards the center. This pushing force is converted into sliding in the slide groove 722 through the connecting rod 75, and forces the support rod 73 to retract inward into the side groove 721 around the rotating shaft 731, so that its outer dimension is smaller than the diameter of the perforation and it passes through smoothly. Once the support rod 73 has completely passed through the perforation and is no longer constrained by the perforation of the casting template 2, the torsion spring on the rotating shaft 731 will immediately drive the support rod 73 to rotate outward and reset, returning to the open umbrella-shaped state.

[0033] Construction workers located above the floor slab can begin to tighten the adjusting nut 6 after the clamping mechanism 7 passes through the perforation of the casting template 2. As the lower surface of the adjusting nut 6 presses against the top surface of the truss 3, the entire tie rod assembly is subjected to an upward lifting force, which is transmitted to the sleeve 72 through the second connecting part 5 and the sliding rod 71, ultimately causing the already opened support rod 73 to tightly "hook" upward against the bottom surface of the casting template 2.

[0034] To prevent the lower clamping mechanism 7 and the second connecting part 5 from rotating during the tightening of the adjusting nut 6, which would prevent the lifting force from being effectively established, firstly, a limiting block 51 is provided at the end of the second connecting part 5 near the sleeve 72. This limiting block 51 can be precisely embedded in the side groove 721 of the sleeve 72, which fixes the sleeve 72 and the second connecting part 5 in the circumferential direction, preventing relative rotation. Secondly, an anti-slip structure, preferably a dense saw, is provided at the end of the support rod 73 that contacts the bottom surface of the casting template 2. When the support rod 73 is pressed tightly against the wooden or composite material casting template 2 under the action of lifting force, the teeth 732 will be deeply embedded in the template material, forming a strong mechanical engagement, effectively preventing the circumferential sliding of the support rod 73 and even the entire lower mechanism, ensuring that when the adjusting nut 6 is rotated, all the torque is used to generate axial lifting force, thereby efficiently and reliably fitting the casting template 2 tightly against the bottom of the composite plate 1, eliminating gaps that may be caused by concrete buoyancy in advance, and preventing grout leakage.

[0035] After the concrete is poured and cured, the formwork 2 needs to be removed. At this time, due to the huge static friction between the support rod 73 and the bottom surface of the formwork 2, it would be very difficult to directly force the second connecting part 5 to disassemble. The construction workers only need to loosen the positioning nut 74 first to release the axial lock on the sleeve 72. Then, they can press down slightly or let the sleeve 72 slide down a short distance along the slide rod 71 under the action of gravity. This displacement is enough to disengage the serration 732 at the end of the support rod 73 from the bottom surface of the formwork 2, which greatly reduces the resistance of subsequent disassembly. After that, the construction workers can easily unscrew the second connecting part 5 from the connection and retrieve it together with the entire clamping mechanism 7. After cleaning, it can be put into the next cycle of use, while the first connecting part 4 remains permanently in the concrete.

Claims

1. A support fixture for improving the flatness of the joints of composite slabs, comprising a casting template (2) disposed below the joints of adjacent composite slabs (1) and fitted to the bottom of the composite slabs (1), characterized in that: It also includes a truss (3) spanning over the joint and a tie rod assembly passing vertically through the truss (3); The tie rod assembly includes a first connecting part (4) and a second connecting part (5) arranged sequentially from top to bottom. The first connecting part (4) and the second connecting part (5) are detachably connected. An adjusting nut (6) for pressing against the top surface of the truss (3) is threaded onto the first connecting part (4). A radially opening and closing clamping mechanism (7) is provided at the bottom of the second connecting part (5). The clamping mechanism (7) can pass through the perforation on the casting template (2) and automatically open after being fully passed through. The tie rod assembly is lifted by tightening the adjusting nut (6) so that the clamping mechanism (7) abuts against the bottom surface of the casting template (2).

2. The support fixture for improving the flatness of composite slab joints according to claim 1, characterized in that, The clamping mechanism (7) includes a slide rod (71) fixedly connected to the second connecting part (5), a sleeve (72) slidably sleeved outside the slide rod (71), and a plurality of support rods (73) rotatably connected to the outside of the sleeve (72). The slide rod (71) is threaded with a positioning nut (74) for locking the axial position of the sleeve (72). The plurality of support rods (73) have an outwardly opening umbrella-shaped structure in the initial state.

3. The support fixture for improving the flatness of composite slab joints according to claim 2, characterized in that, The outer wall of the sleeve (72) is provided with a plurality of side grooves (721) along the circumferential direction. The support rod (73) is rotatably connected to the two side walls of the side grooves (721) through a rotating shaft (731). The rotating shaft (731) is provided with a torsion spring that drives the support rod (73) to remain in an open state.

4. The support fixture for improving the flatness of composite slab joints according to claim 3, characterized in that, The inner wall of the side groove (721) is also provided with a sliding groove (722). The middle part of the support rod (73) is movably connected to the sliding groove (722) through a connecting rod (75). When the support rod (73) is subjected to a thrust towards the sleeve (72), the connecting rod (75) slides in the sliding groove (722) and causes the support rod (73) to retract inward around the pivot (731).

5. The support fixture for improving the flatness of composite slab joints according to claim 2, characterized in that, The end of the support rod (73) that contacts the bottom surface of the casting template (2) is provided with an anti-slip structure.

6. The support fixture for improving the flatness of composite slab joints according to claim 5, characterized in that, The anti-slip structure is a serration (732) formed at the end of the strut (73).

7. The support fixture for improving the flatness of composite slab joints according to claim 3, characterized in that, The second connecting part (5) is provided with a limiting block (51) at one end near the sleeve (72). The side groove (721) can cooperate with the limiting block (51) so that the sleeve (72) and the second connecting part (5) remain fixed in the circumferential direction and cannot rotate relative to each other.

8. The support fixture for improving the flatness of composite slab joints according to claim 2, characterized in that, The first connecting part (4) and the second connecting part (5) are coaxially connected by threads, and the connection between the first connecting part (4) and the second connecting part (5) is located below the cast-in-place concrete layer.

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