A cast-in-situ concrete hollow floor large-size square core mold anti-floating fixing device

Abstract

The application discloses a cast-in-situ concrete hollow floor large-size square core mold anti-floating fixing device and relates to the technical field of hollow floor construction. The application discloses a cast-in-situ concrete hollow floor large-size square core mold anti-floating fixing device and relates to the technical field of hollow floor construction. The application discloses a cast-in-situ concrete hollow floor large-size square core mold anti-floating fixing device and relates to the technical field of hollow floor construction. The application discloses a cast-in-situ concrete hollow floor large-size square core mold anti-floating fixing device and relates to the technical field of hollow floor construction. The application discloses a cast-in-situ concrete hollow floor large-size square core mold anti-floating fixing device and relates to the technical field of hollow floor construction. The application discloses a cast-in-situ concrete hollow floor large-size square core mold anti-floating fixing device and relates to the technical field of hollow floor construction. The application discloses a cast-in-situ concrete hollow floor large-size square core mold anti-floating fixing device and relates to the technical field of hollow floor construction. The application discloses a cast-in-situ concrete hollow floor large-size square core mold anti-floating fixing device and relates to the technical field of hollow floor construction. The application discloses a cast-in-situ concrete hollow floor large-size square core mold anti-floating fixing device and relates to the technical field of hollow floor construction. The application discloses a cast-in-situ concrete hollow floor large-size square core mold anti-floating fixing device and relates to the technical field of hollow floor construction. The application discloses a cast-in-situ concrete hollow floor large-size square core mold anti-floating fixing device and relates to the technical field of hollow floor construction. The application discloses a cast-in-situ concrete hollow floor large-size square core mold anti-floating fixing device and relates to the technical field of hollow floor construction. The application discloses a cast-in-situ concrete hollow floor large-size square core mold anti-floating fixing device and relates to the technical field of hollow floor construction. The application discloses a cast-in-situ concrete hollow floor large-size square core mold anti-floating fixing device and relates to the technical field of hollow floor construction. The application discloses a cast-in-situ concrete hollow floor large-size square core mold anti-floating fixing device and relates to the technical field of hollow floor construction. The application discloses a cast-in-situ concrete hollow floor large-size square core mold anti-floating fixing device and relates to the technical field of hollow floor construction. The application discloses a cast-in-situ concrete

Description

Technical Field

[0001] This invention belongs to the field of hollow floor slab construction technology, specifically relating to a large-size square core mold anti-buoyancy fixing device for cast-in-place concrete hollow floor slabs. Background Technology

[0002] Cast-in-place hollow core slabs utilize lightweight materials arranged in a specific pattern to replace a portion of the concrete in a solid slab, creating cavities or lightweight sandwich structures. This results in a spatial honeycomb-like load-bearing structure, a type of hollow core slab technology. The anti-buoyancy device for hollow core slabs is a mechanism used to ensure the lightweight inner formwork remains in the correct position during concrete pouring, preventing the inner formwork from floating and ensuring the quality and safety of the slab structure.

[0003] Some existing cast-in-place hollow concrete floor slabs directly use steel wire to bind individual inner forms, such as fixing the inner form by drilling holes in the bottom formwork of the floor slab; others use anti-buoyancy reinforcement to prevent the inner form by fixing it with steel wire through holes drilled through the bottom formwork. This fixing method provides limited anti-buoyancy force per hole in the formwork, requiring a large number of holes to be set in the bottom formwork, and the area with a large number of holes is prone to grout leakage, affecting the quality of the project.

[0004] Furthermore, traditional cast-in-place hollow core slabs typically use small, square infill boxes, usually 300mm to 400mm in size, and current anti-buoyancy devices are designed and applied accordingly. However, with the development of hollow core slab technology, the shape and size of the infill boxes are constantly changing, making it difficult to meet the needs of current complex projects. During construction, large-sized infill boxes are systematically arranged within the hollow core slab, between the ribs and the sections enclosed by the ribs. When pouring concrete, the buoyancy generated by the large-sized infill boxes is greater than that of ordinary infill boxes, making it difficult for currently used anti-buoyancy devices to meet the new anti-buoyancy requirements of large-sized square core molds.

[0005] Therefore, based on the above problems, this application proposes an anti-buoyancy fixing device for a large-size square core mold of a cast-in-place hollow concrete floor slab. This device can not only meet the anti-buoyancy requirements of large-size filling boxes, but also reduce the workload, reduce costs, and save construction time in the anti-buoyancy construction of hollow floor slabs. Summary of the Invention

[0006] In view of the defects and problems of existing technologies, the present invention provides a large-size square core mold anti-buoyancy fixing device for cast-in-place hollow concrete floor slabs.

[0007] The solution adopted by this invention to solve its technical problem is: a large-size square core mold anti-buoyancy fixing device for cast-in-place hollow concrete floor slabs, including a support mechanism and an anti-buoyancy mechanism. A square core mold is provided on the top of the support mechanism. The anti-buoyancy mechanism is fitted on the outside of the core mold and fixedly connected to the support mechanism. The anti-buoyancy mechanism includes straps, anti-buoyancy anchors, and rings. The straps are arranged in a grid-like structure and closely attached to the top of the core mold. Hooks are symmetrically provided on the four edges of the straps, and each hook is connected to an anti-buoyancy anchor. An "∞"-shaped ring is fitted around the core mold, and each ring is connected to the other end by a snap-fit ​​structure. Each ring also has symmetrical installation holes in the middle. The anti-buoyancy anchors extend vertically downwards and pass through the installation holes, with their tails extending into the interior of the support mechanism. They are fixedly installed to the lower template of the support mechanism by a limiting component, thereby fixing the square core mold by the anti-buoyancy mechanism.

[0008] Furthermore, the support mechanism includes multiple support rods, which are fixed together in a crisscross pattern by clamps to form a scaffold. A template is placed on top of the scaffold, and a series of steel cage frames are evenly distributed between the bottom of the template and the top of the support rods. Each steel cage frame is supported and fixed by the support rods of the scaffold.

[0009] Furthermore, the top surface of the upper template of the support mechanism is also provided with reserved holes. The number of reserved holes is the same as the number of vertical anti-buoyancy anchor rods. The reserved holes are evenly distributed on the periphery of the square core mold for the bottom of the anti-buoyancy anchor rods to pass through.

[0010] Furthermore, the anti-buoyancy anchor is provided with a connecting ring at the top, and the anchor body extends vertically downward with a nut screwed into the bottom. The connecting ring is hooked together with the hook on the strap.

[0011] Furthermore, the rings are connected by a snap-fit ​​structure, which is a tenon and mortise snap fastener located at the end of the ring, and the tenon and mortise snap fasteners at adjacent ends are rotatably connected by a pin.

[0012] Furthermore, the limiting component includes a U-shaped buckle and a bolt. The buckle has a toothed structure at the top and a screw hole in the middle. The bolt is fitted inside the screw hole and is used to screw and match the nut at the bottom of the anti-buoyancy anchor rod. The anti-buoyancy anchor rod is fixed to the steel keel frame below the support mechanism template by using the U-shaped buckle.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] The anti-buoyancy fixing device for large-size square core molds of cast-in-place hollow concrete floor slabs provided by this invention enhances the stability of large-size square core molds during concrete pouring through the design of the anti-buoyancy mechanism, preventing the core molds from shifting due to buoyancy. The design of the grid-shaped aramid straps and vertical anti-buoyancy anchors provides a larger contact area, effectively dispersing the stress and avoiding damage caused by excessive local pressure, while also ensuring the integrity of the floor slab structure and the correct position of the reinforcing cage.

[0015] The anti-buoyancy anchor rod and the grid-shaped aramid binding strap of this invention are connected by a ring, which facilitates quick installation and adjustment and improves construction efficiency; the design of the "∞"-shaped side ring hoop restricts the lateral displacement of the core mold during the pouring process, further improving the stability of the structure; the anti-buoyancy anchor rod and U-shaped keel buckle and other components adopt a detachable design, which can be disassembled and reused after the hollow floor slab is cured, saving costs.

[0016] The anti-buoyancy fixing device provided by this invention ensures the thickness of the concrete protective layer of the rib beams around the large-size square core mold, thereby guaranteeing the load-bearing capacity of the entire hollow floor slab. Since the stability of the core mold is guaranteed, the uniformity and quality of concrete pouring can be further improved, and the generation of voids and cracks can be reduced. Furthermore, the anti-buoyancy fixing device of this invention is applicable to hollow floor slabs of different sizes and shapes, and has good versatility and adaptability. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a three-dimensional structural diagram of the strap of the present invention;

[0019] Figure 3 This is a three-dimensional structural diagram of the tenon and mortise fastener of the present invention;

[0020] Figure 4 This is a schematic diagram of the connection structure of the ring hoop of the present invention;

[0021] Figure 5 This is a three-dimensional structural diagram of the anti-buoyancy mechanism of the present invention;

[0022] Figure 6 This is a schematic diagram of the structure of the limiting component of the present invention;

[0023] Figure 7 This is a schematic diagram showing the installation position of the limiting component of the present invention.

[0024] In the diagram: 1-Binding strap, 2-Anti-buoyancy anchor rod, 3-Ring hoop, 4-Snap buckle, 5-Bolt, 6-Upper template, 7-Steel cage frame, 8-Support rod, 9-Core mold, 10-Connecting ring, 11-Nut, 12-Mounting hole, 13-Pin, 14-Tenon buckle, 15-Hook ring. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Please see Figure 1-7 This invention provides a technical solution for a large-size square core mold anti-buoyancy fixing device for cast-in-place hollow concrete floor slabs. This device effectively fixes the large-size core mold at a predetermined position on the hollow floor slab; limits the upward and lateral displacement of the large-size square core mold caused by concrete pouring; ensures the thickness of the upper and lower concrete slabs and the thickness of the protective layer of the surrounding rib beams; some materials of the anti-buoyancy device are recyclable, reducing costs; the fixing device arrangement method is simple, reducing the workload, cost, and construction period of the hollow floor slab anti-buoyancy construction. Example

[0027] This embodiment provides a large-size square core mold anti-buoyancy fixing device for cast-in-place hollow concrete floor slabs. The large-size square core mold is placed at the grid positions defined by ribs arranged orthogonally along the hollow floor slab. Each grid contains one large-size square core mold, and the bottom of the core mold is a support mechanism. Figure 1 As shown, the support mechanism includes a scaffold composed of multiple support rods 8. The multiple support rods are fixed together in a crisscross pattern by clamps to form the scaffold. A template 6 is placed on top of the scaffold, and a series of steel cage frames 7 are evenly distributed between the bottom of the template 6 and the top of the support rods. Each steel cage frame 7 is supported and fixed by the support rods of the scaffold.

[0028] like Figure 1 and 2 As shown, the large-sized square core mold has an inherent anti-buoyancy mechanism on its outer periphery. The anti-buoyancy mechanism includes a strap 1, an anti-buoyancy anchor rod 2, and a ring 3. The strap 1 is an aramid strap with a grid-like structure and is tightly attached to the top of the core mold. Hooks 15 are symmetrically arranged around the edges of the strap, and each hook is connected to an anti-buoyancy anchor rod 2. Specifically, the top of the anti-buoyancy anchor rod is provided with a connecting ring 10, which extends vertically downward and has a nut 11 screwed into its bottom. The connecting ring 10 is hooked together with the hooks 15 on the strap. In this embodiment, four sets of hooks are provided around the strap, two in each set, which are connected to eight vertical anti-buoyancy anchor rods.

[0029] This invention's design decomposes the upward buoyancy force experienced by a large square core mold during concrete pouring into eight downward tensile forces. These tensile forces are borne by vertical anti-buoyancy anchor rods, with the fixed ends located on the steel keel frame below the mold. Relying on the stability of the steel keel frame, a relatively firm fixed end is provided for the entire anti-buoyancy fixing device.

[0030] The grid-shaped aramid straps increase the contact area with the large square core mold, which can prevent the large square core mold from being damaged by the anti-buoyancy device due to its small contact area and large pressure when subjected to large buoyancy. At the same time, due to the restraint of the grid-shaped aramid straps, the steel cage in the hollow floor slab will not be affected by the floating of the large square core mold, thus preventing displacement of the steel cage and unevenness of the floor slab surface.

[0031] Furthermore, this invention arranges four sets of rings at the ends of the grid-shaped aramid straps and the vertical anti-buoyancy anchor rods, with the four sets of rings corresponding to each other. Connecting the straps and the anti-buoyancy anchor rods through the rings increases the rotation angle of the vertical anti-buoyancy anchor rods in the direction perpendicular to the side surface of the large-size square core mold. This facilitates the rapid installation of the grid-shaped aramid straps and the vertical anti-buoyancy anchor rods on the large-size square core mold during the anti-buoyancy construction of hollow floor slabs.

[0032] like Figure 3 and 4 As shown, four ring hoops 3 encircle the periphery of the square core mold, and each ring hoop is rotatably connected end-to-end by a snap-fit ​​structure. The structure of the ring hoop is "∞" shaped, and each ring hoop has two pairs of mounting holes 12 at the middle position. Each pair of mounting holes is on the same vertical axis for the anti-buoyancy anchor rod 12 to pass through. In this embodiment, the "∞" shaped side ring hoop is used to limit the lateral displacement of the large square core mold during concrete pouring. For convenient transportation and storage, the "∞" shaped side ring hoop is divided into four pieces, and each piece is rotatably connected together by a snap-fit ​​structure.

[0033] like Figure 3 As shown, the clamping structure is the tenon and mortise buckle 14 located at the end of the ring hoop. In this embodiment, it is a concave-convex mating structure. The tenon and mortise buckles at adjacent ends are rotatably connected by pins 13. The tenon and mortise buckles allow each piece of the "∞"-shaped side ring hoop to be connected together, and at the same time, the ring hoop can be rotated, thereby fixing the ring hoop in a suitable position on the square core mold. The ring hoop is combined with the vertical anti-buoyancy anchor rod through the mounting hole in its middle, so that the grid-shaped aramid strap, the vertical anti-buoyancy anchor rod, and the side ring hoop form a cage structure, fixing the large-sized square core mold in it. This better restricts the upward floating and lateral movement of the large-sized square core mold, and also ensures the thickness of the concrete protective layer of the rib beams around the large-sized square core mold, ensuring that the load-bearing capacity of the entire hollow floor slab is not affected.

[0034] In addition, since the vertical anti-buoyancy anchor rods are matched and pass through the mounting holes 12 on the ring, the displacement of the vertical anti-buoyancy anchor rods in the horizontal direction can be restricted, so that the entire anti-buoyancy fixing device will not move when pouring concrete, ensuring the stability of the anti-buoyancy fixing device and also ensuring the correct position of the large-size square core mold in the hollow floor slab.

[0035] The top surface of the upper template 6 of the support mechanism is also provided with reserved holes. The number of reserved holes is the same as the number of vertical anti-buoyancy anchor rods. The reserved holes are evenly distributed on the periphery of the square core mold for the bottom of the anti-buoyancy anchor rods to pass through. Figure 5 As shown, a nut 11 is screwed onto the lower end of the anti-buoyancy anchor rod, and it is fixedly installed to the lower template 6 of the support mechanism through a limiting component, thereby fixing the square core mold to the anti-buoyancy mechanism. Figure 6 and Figure 7 As shown, the limiting component includes a U-shaped buckle 4 with a toothed top and a screw hole in the middle. A bolt 5 is fitted inside the screw hole. The bolt is used to screw and match the nut 11 at the bottom of the anti-buoyancy anchor rod. Thus, the vertical anti-buoyancy anchor rod is connected to the U-shaped keel buckle below the template through the pre-drilled hole in the template and fixed to the steel keel frame below the template by a detachable fixing bolt, providing reliable anti-buoyancy support for the entire anti-buoyancy fixing device.

[0036] Furthermore, in actual connection, such as Figure 1 and Figure 6 As shown, the top of the U-shaped keel clip 4 is matched and snapped onto the steel keel frame 7, corresponding to the holes in the template. Bolts 5 are used to fix the U-shaped keel clip to the nut at the bottom of the vertical anti-buoyancy anchor rod. This design of the limiting component in this invention, with its toothed surface in the U-shaped groove of the U-shaped keel clip, better secures the steel keel frame below the template, preventing the anti-buoyancy device from moving during concrete pouring. Furthermore, the detachable fixing bolts serve to fix the entire anti-buoyancy device to the steel keel frame below the template. The detachable fixing bolts and U-shaped keel clips can be removed and reused after the hollow core slab has cured, achieving cost savings.

[0037] The large-size square core mold anti-buoyancy fixing device for cast-in-place hollow concrete floor slabs provided by this invention, in practical application, firstly places the large-size square core mold at the grid positions divided by the orthogonally arranged ribs in the hollow floor slab, with one large-size square core mold placed in each grid. A grid-shaped aramid strap is installed on the upper surface of the large-size square core mold and connected to four sets of vertical anti-buoyancy anchor rods located on the side surfaces of the large-size core mold. The "∞"-shaped side rings are connected together using tenon and mortise snaps. The vertical anti-buoyancy anchor rods are passed through the pre-drilled installation holes in the middle of the "∞"-shaped side rings and fitted onto the side surfaces of the large-size square core mold. Next, the lower ends of the anti-buoyancy anchor rods are passed through the pre-drilled holes at the top of the upper template and fixed to the steel keel frame below the template using "U"-shaped toothed snaps. They are then connected to the vertical anti-buoyancy anchor rods using detachable fixing bolts. After ensuring all connections are securely installed and checking the stability of the anti-buoyancy fixing device, and confirming the correct position of the large-size square core mold in the hollow floor slab, concrete pouring can proceed.

[0038] The anti-buoyancy fixing device for large-size square core molds of cast-in-place hollow concrete floor slabs provided by this invention can limit the upward and lateral displacement of large-size square core molds caused by concrete pouring; ensure the thickness of the upper and lower concrete slabs and the thickness of the protective layer of the surrounding rib beams; some materials of the anti-buoyancy device can be recycled, reducing project costs; the fixing device arrangement method is simple, which can reduce the workload of anti-buoyancy construction of hollow floor slabs.

[0039] The above description is only a preferred embodiment of the present invention and does not limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cast-in-situ concrete hollow floor large-size square core mold anti-floating fixing device, characterized in that: The support mechanism and the anti-floating mechanism are included, the square core mold (9) is arranged on the top of the support mechanism, the anti-floating mechanism is sleeved outside the core mold and is fixedly connected with the support mechanism, the anti-floating mechanism comprises a bandage (1), an anti-floating anchor rod (2) and a hoop (3), the bandage (1) is in close contact with the top of the core mold and is in the shape of a cross, hook and loop (15) are symmetrically arranged at the periphery of the bandage, and the anti-floating anchor rod (2) is connected with each hook and loop, respectively, the hoop (3) is in the shape of "∞" and is sleeved around the periphery of the core mold, the hoops are rotatably connected through clamping structures at the head and tail, and the middle part of each hoop is symmetrically provided with a mounting hole (12), the anti-floating anchor rod (2) extends downward along the vertical direction and passes through the mounting hole (12), the tail extends to the inside of the support mechanism, and is fixedly installed on the lower mold plate (6) of the support mechanism through a limiting assembly, so that the square core mold is fixed by the anti-floating mechanism.

2. The anti-floating fixing device for large-size square core form of cast-in-situ concrete hollow floor, according to claim 1, characterized in that: The support mechanism comprises a plurality of support rods (8), the support rods are fixed together through hoops and are arranged in a longitudinal and transverse manner to form a scaffold, a mold plate (6) is arranged above the scaffold, and a series of steel cage skeletons (7) are uniformly distributed between the bottom of the mold plate (6) and the top of the support rods, and each steel cage skeleton (7) is supported and fixed by the support rods of the scaffold.

3. The anti-float fixing device for large-size square core form of cast-in-situ concrete hollow floor according to claim 2, characterized in that: The top surface of the mold plate (6) of the support mechanism is also provided with a reserved hole, the number of the reserved holes is consistent with the number of the vertical anti-floating anchor rods, and the reserved holes are uniformly distributed on the periphery of the square core mold and are used for the bottom of the anti-floating anchor rod to pass through.

4. The anti-float fixing device for large-size square core form of cast-in-situ concrete hollow floor according to claim 1, characterized in that: The top of the anti-floating anchor rod (2) is provided with a connecting ring, the anchor rod body extends downward along the vertical direction, and a nut (11) is screwed at the bottom, and the connecting ring is hooked together with the hook and loop (15) on the bandage.

5. The anti-float fixing device for large-size square core form of cast-in-situ concrete hollow floor according to claim 1, characterized in that: The hoops are connected through the clamping structure, the clamping structure is a mortise and tenon buckle (14) arranged at the end of the hoop, and the mortise and tenon buckles at the two adjacent ends are rotatably connected through a bolt (13).

6. The anti-float fixing device for large-size square core form of cast-in-situ concrete hollow floor according to claim 1, characterized in that: The limiting assembly comprises a U-shaped buckle (4) and a bolt (5), the top of the buckle is in a toothed structure, a screw hole is formed in the middle, and the bolt (5) is sleeved in the screw hole, the bolt is used for screwing and matching with the nut (11) at the bottom of the anti-floating anchor rod, and the U-shaped buckle is used to fix the anti-floating anchor rod on the steel dragon skeleton below the mold plate of the support mechanism.

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