Bracket for renovation and reconstruction of large-scale building concrete top slab and top slab removal method thereof

Abstract

The present invention relates to a bracket for renovation and reconstruction of large-scale concrete roof panels and a method for removing the roof panels, and belongs to the technical field of renovation and reconstruction of building roofs. The bracket comprises two parallel horizontal bars, both ends of the horizontal bars are respectively fixed with cross bars, the horizontal bars and the cross bars form a rectangular frame, two cross bars are respectively fixed with two lifting ears, and the lifting ears are connected with lifting ropes. When removing the roof panel, the roof panel is placed on the bracket, and the bracket is used as the main lifting force point, thereby avoiding direct lifting on the old roof panel, and avoiding the roof panel being fragile due to age, and being broken during the lifting process, causing safety hazards.

Description

Technical Field

[0001] The invention relates to the technical field of building roof renovation and reconstruction, in particular to a bracket for renovation and reconstruction of a large-scale building concrete top plate and a top plate removal method thereof. Background Art

[0002] At present, many large-span and large-space conference centers, museums, exhibition halls, gymnasiums and other buildings built in my country mostly use steel truss roof structures.

[0003] The steel truss structure roof includes steel trusses and reinforced concrete roof panels arranged on the steel trusses. The roof panels are welded and fixed to the steel trusses. However, for some buildings built in the 1960s to 1980s, the reinforced concrete roof panels on the roofs have weakened structural strength after 50 to 60 years and are insufficient in earthquake resistance. In view of the above problems, a technology for removing old roof panels is needed to safely remove the old roof panels. Summary of the invention

[0004] In view of the shortcomings of the prior art, the first object of the present invention is to provide a bracket for renovation and reconstruction of large-scale building concrete roof slabs, which can be used for dismantling roof panels, placing the roof panels on the bracket, and using the bracket as the main lifting force point, thereby avoiding direct lifting on the old roof panels. The bracket has a simple structure and low cost.

[0005] The second object of the present invention is to provide a bracket for renovation and reconstruction of large-scale building concrete roof panels for use in a roof panel removal method, thereby facilitating safe removal of the roof panels.

[0006] The above object of the present invention is achieved through the following technical solutions:

[0007] A bracket for renovation and reconstruction of large-scale building concrete roofs comprises two parallel horizontal bars, both ends of which are respectively fixed with cross bars, the horizontal bars and the cross bars form a rectangular frame, two lifting ears are respectively fixed on the two cross bars, and the lifting ears are connected with lifting ropes.

[0008] By adopting the above technical scheme, a frame having the same size as the roof panel is formed by welding the horizontal bars and the cross bars to each other, which can be used for dismantling the roof panel. The roof panel is placed on the bracket, and the bracket is used as the main lifting force point, thereby avoiding direct lifting on the old roof panel and avoiding the problem that the roof panel is fragile due to age and is broken during the lifting process, causing safety hazards. At the same time, it has a simple structure and low cost.

[0009] In a preferred example, the present invention can be further configured as follows: a plurality of support rods parallel to the cross rods are fixedly disposed inside the frame at intervals.

[0010] By adopting the above technical solution, the stability and load-bearing capacity of the frame are increased.

[0011] In a preferred example, the present invention can be further configured as follows: the frame includes multiple frame units, and two adjacent frame units are respectively provided with support rods at the joints, and the support rods are provided with multiple pairs of coaxially arranged threaded holes, and fixing bolts are passed through the threaded holes to fix the two frame units.

[0012] By adopting the above technical solution, the frame is divided into a plurality of frame units, the length of the frame is reduced, and it is convenient to transport the bracket from indoors to the bottom of the roof panel to be removed.

[0013] In a preferred example, the present invention can be further configured as follows: both ends of the lifting rope are respectively connected to mechanical clamps, the mechanical clamps include a U-shaped clamp, and corresponding sockets are provided on the two side walls of the U-shaped clamp. The U-shaped clamp is clamped on the lifting ear and the U-shaped clamp and the lifting ear are connected by fastening bolts that pass through the sockets and the lifting ear in sequence.

[0014] By adopting the above technical solution, the U-shaped clip is directly clamped on the lifting lug and fixed with bolts, so that the connection and disassembly of the lifting rope and the lifting lug are convenient.

[0015] In a preferred example, the present invention can be further configured as follows: both ends of the crossbar extend out of two sides of the frame respectively.

[0016] By adopting the above technical solution, the roof panel can be better supported.

[0017] In a preferred example, the present invention can be further configured as follows: the horizontal rods and the support rods are made of square steel, and the cross rods are made of H-shaped steel.

[0018] By adopting the above technical solution, since the main gravity of the roof panel on the bracket acts on the cross bar, the cross bar is made of H-shaped steel to ensure its bearing capacity, and the horizontal bar and the support bar are made of light square steel. Under the premise of ensuring the bearing capacity of the bracket, the weight of the bracket is reduced.

[0019] In a preferred example, the present invention can be further configured as follows: before demolition, the seam joints of the roof panels to be demolished are first cut, and then the bracket is transported from indoors to the bottom of the roof panels to be demolished, and four holes are opened on the roof panels at positions corresponding to the positions of the bracket lifting ears, and the lifting ropes located above the roof panels are passed through the holes and connected to the lifting ears using the mechanical clamps thereon, the lifting ropes are tightened, the roof panels are dragged by the bracket, and then the welding points between the roof panels and the steel roof trusses are cut and separated, and the old roof panels are lifted up and removed by the bracket.

[0020] By adopting the above technical solution, when dismantling the old roof panels, the roof panels are placed on the brackets, and the brackets are used as the main lifting force points, thereby avoiding direct lifting on the old roof panels, which are fragile due to age and may break during the lifting process, causing safety hazards.

[0021] In a preferred example, the present invention can be further configured as follows: the roof panels and the steel roof trusses are cut by gas welding.

[0022] By adopting the above technical solution, it is possible to avoid damage to the steel roof truss during cutting, thereby avoiding affecting its structural strength.

[0023] In a preferred example, the present invention can be further configured as follows: a small gantry is provided on the roof panel, a lifting rope is connected to a lifting device on the small gantry, and the old roof panel is detached by applying force through the lifting device.

[0024] By adopting the above technical solution, when removing the roof panels in the places that the crane boom cannot reach, a small gantry is used to be placed on the roof to remove the roof panels.

[0025] In summary, the present invention includes the following beneficial technical effects:

[0026] 1. By making a bracket that matches the roof panel, when removing the old roof panel, the bracket is placed at the bottom of the roof panel, and the bracket is used as the main component for removing the roof panel, so as to avoid the problem of breaking during the lifting process by directly hoisting on the roof panel, and the safety is high; in addition, the bracket has a simple structure and low cost;

[0027] 2. In places where the crane boom cannot reach, it is more convenient to use a small gantry for dismantling. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic diagram of the structure of the bracket;

[0029] Figure 2 yes Figure 1 A partial enlarged schematic diagram of part A;

[0030] Figure 3 It is a structural diagram of the bracket in use status.

[0031] In the figure, 1, horizontal rod; 2, cross bar; 3, lifting lug; 4, lifting rope; 5, supporting rod; 6, frame unit; 7, mechanical clamp; 71, U-shaped clamp; 72, fastening bolt; 8, roof panel. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0033] Reference Figure 1 and Figure 2, which is a bracket for renovation and reconstruction of large-scale building concrete roof panels disclosed by the present invention, includes two parallel horizontal bars 1, and cross bars 2 are respectively welded at both ends of the horizontal bars 1. The horizontal bars 1 and the cross bars 2 form a rectangular frame, and the size of the frame is the same as the size of the roof panel 8 to be removed. Two lifting ears 3 are respectively welded on the two cross bars 2, and the two lifting ears 3 are symmetrically arranged about the central axis of the frame along the length direction of the horizontal bar 1. The lifting ears 3 are connected with lifting ropes 4, and the frame is lifted by the lifting ropes 4.

[0034] A plurality of support rods 5 parallel to the crossbar 2 are evenly spaced inside the frame, and both ends of the support rods 5 are respectively welded to the horizontal rods 1 to increase the stability and load-bearing capacity of the frame.

[0035] Since the main gravity of the roof panel 8 on the bracket acts on the cross bar 2, in order to ensure that the bracket supports the roof panel 8, the horizontal bar 1 and the support bar 5 are made of square steel, and the cross bar 2 is made of H-shaped steel. In addition, the two ends of the cross bar 2 are respectively extended out of the two sides of the frame, so as to better support the roof panel 8.

[0036] Furthermore, since the length of a single roof panel 8 is 4-6m, which is relatively long, in order to facilitate the transportation of the bracket from indoors to the bottom of the roof panel 8 to be removed from the roof, the frame is divided into multiple pieces, and the frame includes multiple frame units 6. Two adjacent frame units 6 are respectively fixed with support rods 5 at the joints, and multiple pairs of coaxially arranged threaded holes are opened on the side walls of the two support rods 5. Fixing bolts are inserted into the threaded holes, and nuts are used to connect the two support rods 5 side by side to splice and fix the frame units 6. By dividing the frame into multiple frame units 6, the length of the frame is reduced, which is convenient for the transportation of the frame.

[0037] Mechanical clamps 7 are respectively connected to both ends of the lifting rope 4, and the mechanical clamps 7 include a U-shaped clamp 71. Corresponding insertion holes are respectively opened on the two side walls of the U-shaped clamp 71. The U-shaped clamp 71 is clamped on the lifting ear 3 and the U-shaped clamp 71 and the lifting ear 3 are connected by fastening bolts 72 that pass through the insertion holes and the lifting ear 3 in turn and cooperate with nuts, so as to facilitate the connection and disassembly of the lifting rope 4 and the lifting ear 3.

[0038] Reference Figure 3 , as the roof panel 8 has weakened its structural strength and become brittle after decades of use, it is likely to break during the removal process and fall indoors, posing a safety hazard. Therefore, in order to ensure the safe removal of the old roof, this solution proposes a method for removing the old roof panel 8 using a bracket, which includes the following steps:

[0039] The roof panels 8 are removed from low to high. Before removal, the seams of the roof panels 8 to be removed are cut with a cutting machine to separate the adjacent roof panels 8. Then the frame unit 6 is transported from the room to the bottom of the roof panels 8 to be removed for assembly and fixation. Four holes are opened at the positions corresponding to the lifting ears 3 on the old roof panels 8, and the two ends of the lifting rope 4 are respectively passed through the two holes, and the mechanical clamps 7 are connected to the lifting ears 3. The lifting rope 4 is hooked on the hook of the crane, the lifting rope 4 is tightened, and the roof panel 8 is dragged with a bracket. Then, the four corners of the roof panel 8 welded to the steel roof frame are cut and separated. Gas welding is used for cutting to avoid damage to the steel roof frame and affect its structural strength. After the cutting is completed, the old roof panel 8 is lifted up by the bracket for removal. After the first roof panel 8 is removed, use a crane to move the bracket from the hole of the first removed roof panel 8 on the roof, put the bracket into the room, separate the bracket from the mechanical fixture 7, move the bracket to the bottom of the roof panel 8 to be removed, repeat the above steps to remove the roof panel 8.

[0040] When the roof area is large and the crane's boom cannot cover the entire roof, when removing the roof panels 8 that are not covered by the crane's boom, a small gantry is placed on the roof, and the lifting rope 4 is connected to the electric hoist or hand hoist on the gantry. The old roof panels 8 are removed by applying force through the electric hoist or hand hoist, and then lifted off the roof by the crane.

[0041] In this method, when dismantling the old roof panel 8, the roof panel 8 is placed on a bracket, and the bracket is used as the main lifting force point, thereby avoiding direct lifting on the old roof panel 8 and preventing the roof panel 8 from being broken during the lifting process due to age and causing safety hazards.

[0042] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A bracket for renovation of large-scale building concrete roof, characterized by: The invention comprises two parallel horizontal bars (1), two ends of the horizontal bars (1) are respectively fixed with cross bars (2), the horizontal bars (1) and the cross bars (2) form a rectangular frame, two cross bars (2) are respectively fixed with two lifting ears (3), and the lifting ears (3) are connected with lifting ropes (4). When in use, four holes are respectively opened at positions corresponding to the lifting ears (3) on the old roof panel (8), and the two ends of the lifting rope (4) are respectively passed through the two holes; a plurality of support rods (5) parallel to the cross bars (2) are fixedly arranged inside the frame at intervals; the frame comprises a plurality of frame units (6), and two adjacent frame units (6) are respectively provided with support rods (5) at the joints, and the support rods (5) are respectively arranged at the joints. The support rod (5) is provided with a plurality of pairs of coaxially arranged threaded holes, and fixing bolts are inserted into the threaded holes to fix the two frame units (6); the two ends of the lifting rope (4) are respectively connected with mechanical clamps (7), and the mechanical clamps (7) include U-shaped clamps (71), and corresponding insertion holes are provided on the two side walls of the U-shaped clamps (71). The U-shaped clamps (71) are clamped on the lifting ears (3) and connected with the lifting ears (3) by fastening bolts (72) that pass through the insertion holes and the lifting ears (3) in sequence; the two ends of the cross bar (2) extend out of the two sides of the frame respectively; the horizontal rod (1) and the support rod (5) are made of square steel, and the cross bar (2) is made of H-shaped steel.

2. A method for removing a large-scale building concrete top slab using the bracket of claim 1, comprising the following steps: Before demolition, first cut the joint of the roof panel to be demolished, then move the bracket from the room to the bottom of the roof panel to be demolished, open four holes on the roof panel corresponding to the position of the bracket's lifting ears, pass the lifting rope above the roof panel through the holes and connect it with the lifting ears using the mechanical clamp on it, tighten the lifting rope, use the bracket to hold the roof panel, and then cut and separate the welding place between the roof panel and the steel roof frame. The roof panel and the steel roof frame are cut by gas welding; The old roof panel is lifted up and removed by the bracket; a small gantry is arranged on the roof panel, a lifting rope is connected to the lifting equipment on the small gantry, and the old roof panel is removed by applying force through the lifting equipment.

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