CN111794557A

CN111794557A - Bracket for renovating and transforming large-scale building concrete roof and roof dismantling method thereof

Info

Publication number: CN111794557A
Application number: CN202010575242.9A
Authority: CN
Inventors: 杜晓龙; 王利; 宋辉; 陈永福; 吴凯; 王兵臣
Original assignee: Beijing Construction Engineering Group Co Ltd
Current assignee: Beijing Construction Engineering Group Co Ltd
Priority date: 2020-06-22
Filing date: 2020-06-22
Publication date: 2020-10-20

Abstract

The invention relates to a bracket for renovating and reforming a concrete roof of a large building and a roof dismantling method thereof, belonging to the technical field of renovating and reforming a building roof. Through when demolising the roof boarding, arrange the roof boarding in the bracket on, regard the bracket as main hoist and mount stress point to avoid direct hoist and mount on old roof boarding, avoid the roof boarding fragile because of the old time, at the in-process of hoist and mount, take place the breakage, cause the potential safety hazard.

Description

Bracket for renovating and transforming large-scale building concrete roof and roof dismantling method thereof

Technical Field

The invention relates to the technical field of renovation and reconstruction of building roofs, in particular to a bracket for renovation and reconstruction of a concrete roof of a large building and a roof dismantling method thereof.

Background

At present, most roof structures of buildings such as large-span and large-space conference centers, museums, exhibition halls, gymnasiums and the like built in China adopt steel truss structure roofs.

The steel truss structure roof comprises a steel truss and a reinforced concrete roof panel arranged on the steel truss, the roof panel and the steel truss are welded and fixed, however, in some buildings built in the 60-80 years of the 20 th century, the reinforced concrete roof panel on the roof is weakened in structural strength after 50-60 years, and the earthquake resistance is insufficient, and in order to solve the problems, an old roof panel dismantling technology is needed to safely dismantle the old roof panel.

Disclosure of Invention

Aiming at the defects in the prior art, the first purpose of the invention is to provide the bracket for renovating and transforming the large-scale building concrete roof, which can be used for dismantling the roof panel, the roof panel is arranged on the bracket, and the bracket is used as a main hoisting stress point, so that the roof panel is prevented from being directly hoisted on the old roof panel, and the bracket has a simple structure and low manufacturing cost.

The second purpose of the invention is to provide a bracket for renovating and transforming a large-scale building concrete roof, which is used for a roof dismantling method and is convenient for safely dismantling roof boards.

The above object of the present invention is achieved by the following technical solutions:

the bracket for renovating and reconstructing the concrete roof of the large-scale building comprises two horizontal rods which are parallel to each other, the two ends of each horizontal rod are respectively and fixedly provided with a horizontal rod, the horizontal rods and the horizontal rods form a rectangular frame, two lifting lugs are respectively and fixedly arranged on the horizontal rods, and lifting ropes are connected to the lifting lugs.

Through adopting above-mentioned technical scheme, form the frame that size and roof boarding are unanimous through the mutual welding of horizontal pole and horizontal pole, can be used for demolising of roof boarding, arrange the roof boarding in the bracket, regard the bracket as main hoist and mount stress point to avoid direct hoist and mount on old roof boarding, avoid the roof boarding fragile because of the old time, at the in-process of hoist and mount, take place the breakage, cause the problem of potential safety hazard, its simple structure, cost are low simultaneously.

The present invention in a preferred example may be further configured to: and a plurality of support rods parallel to the cross rod are fixedly arranged in the frame at intervals.

By adopting the technical scheme, the stability and the bearing capacity of the frame are improved.

The present invention in a preferred example may be further configured to: the frame comprises a plurality of sections of frame units, supporting rods are respectively arranged at the splicing positions of two adjacent frame units, a plurality of pairs of threaded holes which are coaxially arranged are formed in the supporting rods, and fixing bolts are arranged in the threaded holes in a penetrating mode to fix the two frame units.

Through adopting above-mentioned technical scheme, through dividing into polylith frame element with the frame, reduce the length of frame, be convenient for with the bracket from indoor fortune to the roof wait to demolish the below of roof boarding.

The present invention in a preferred example may be further configured to: the lifting rope is characterized in that two ends of the lifting rope are respectively connected with a mechanical fixture, the mechanical fixture comprises a U-shaped clamp, two side walls of the U-shaped clamp are provided with corresponding insertion holes, and the U-shaped clamp is clamped on the lifting lug and is connected with the lifting lug through fastening bolts which sequentially penetrate through the insertion holes and the lifting lug.

Through adopting above-mentioned technical scheme, directly utilize U type card to press from both sides to hold on the lug, the bolt fastening is convenient for the lifting rope and the lug are connected and are dismantled.

The present invention in a preferred example may be further configured to: two ends of the cross rod respectively extend out of two sides of the frame.

Through adopting above-mentioned technical scheme, better bearing the roof boarding.

The present invention in a preferred example may be further configured to: the horizontal rod and the supporting rod are made of square steel, and the cross rod is made of H-shaped steel.

Through adopting above-mentioned technical scheme, because roof boarding on the bracket its main action of gravity is on the horizontal pole, utilize H shaped steel to make the horizontal pole, guarantee its bearing capacity, the light square steel of gravity is selected for use to the horizon bar and bracing piece and is made, under the prerequisite of guaranteeing bracket bearing capacity, reduces the weight of bracket.

The present invention in a preferred example may be further configured to: before dismantling, firstly cutting the seam joint of the roof panel to be dismantled, then conveying the bracket to the lower part of the roof panel to be dismantled on the roof from the indoor, respectively forming four holes at the positions corresponding to the lifting lugs of the bracket on the roof panel, penetrating the lifting rope positioned above the roof panel from the holes, connecting the lifting rope with the lifting lugs by using a mechanical fixture on the lifting rope, tensioning the lifting rope, dragging the roof panel by using the bracket, then cutting and separating the roof panel from the welding position of the steel roof truss, and upwards supporting and dismantling the old roof panel by using the bracket.

Through adopting above-mentioned technical scheme, when detaching old roof boarding, arrange the roof boarding in the bracket, regard the bracket as main hoist and mount stress point to avoid direct hoist and mount on old roof boarding, avoid it fragile because of the old time, at the in-process of hoist and mount, take place the breakage, cause the potential safety hazard.

The present invention in a preferred example may be further configured to: the roof board and the steel roof truss are cut by gas welding.

Through adopting above-mentioned technical scheme, lead to the fact destruction to steel roof truss when avoiding the cutting, influence its structural strength.

The present invention in a preferred example may be further configured to: the roof panel is provided with a small portal frame, the lifting rope is connected with the hoisting equipment on the small portal frame, and the old roof panel is detached through the force applied by the hoisting equipment.

By adopting the technical scheme, when the roof panel which cannot be covered by the crane boom is dismantled, the roof panel is dismantled by arranging the small portal frame on the roof.

In summary, the invention has the following beneficial technical effects:

1. by manufacturing the bracket matched with the roof board, when the old roof board is dismantled, the bracket is arranged at the bottom of the roof board, and the bracket is used as a main component for dismantling the roof board, so that the problem of crushing in the hoisting process caused by direct hoisting on the roof board is avoided, and the safety is high; in addition, the bracket has simple structure and low counterfeiting;

2. and the small portal frame is utilized to disassemble at the place where the suspension arm of the crane can not cover, so that the crane is more convenient.

Drawings

FIG. 1 is a schematic view of a bracket;

FIG. 2 is an enlarged partial schematic view of portion A of FIG. 1;

fig. 3 is a structural diagram of a use state of the bracket.

In the figure, 1, a horizontal rod; 2. a cross bar; 3. lifting lugs; 4. a lifting rope; 5. a support bar; 6. a frame unit; 7. a mechanical clamp; 71. a U-shaped card; 72. fastening a bolt; 8. a roof panel.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 and 2, the bracket for renovating and reconstructing a concrete roof of a large building disclosed by the invention comprises two horizontal rods 1 which are parallel to each other, cross rods 2 are respectively welded at two ends of each horizontal rod 1, the horizontal rods 1 and the cross rods 2 form a rectangular frame, the size of the frame is the same as that of a roof panel 8 to be dismantled, two lifting lugs 3 are respectively welded on the two horizontal rods 2, the two lifting lugs 3 are symmetrically arranged along the central axis of the frame in the length direction of the horizontal rods 1, lifting ropes 4 are connected to the lifting lugs 3, and the frame is lifted up through the lifting ropes 4.

The inside interval of frame is even to be equipped with many bracing pieces 5 that are on a parallel with horizontal pole 2, and the both ends of bracing piece 5 weld with horizon bar 1 respectively, increase the stability and the load capacity of frame.

Because roof boarding 8 is on its main action of gravity of bracket on horizontal pole 2, in order to guarantee the bearing of bracket to roof boarding 8, make horizon bar 1 and bracing piece 5 by square steel, horizontal pole 2 is made by H shaped steel. In addition, extend the both ends of horizontal pole 2 respectively the both sides of frame to better bearing roof boarding 8.

Further, because 8 individual length of roof boarding are 4-6m, length is longer, in order to be convenient for transport the bracket from indoor to the roof and wait to demolish the below of roof boarding 8, divide into the polylith with the frame, the frame includes multisection frame element 6, two adjacent frame element 6 have set firmly bracing piece 5 respectively in the concatenation punishment, set up many pairs of coaxial screw holes that set up on the lateral wall of two bracing pieces 5, the fixing bolt wears to establish in the screw hole, the cooperation nut is connected two bracing pieces 5 side by side, it is fixed to make 6 concatenations of frame element. By dividing the frame into a plurality of frame units 6, the length of the frame is reduced, facilitating transport of the frame.

The two ends of the lifting rope 4 are respectively connected with a mechanical clamp 7, each mechanical clamp 7 comprises a U-shaped clamp 71, two side walls of each U-shaped clamp 71 are respectively provided with corresponding jacks, the U-shaped clamps 71 are clamped on the lifting lugs 3, the U-shaped clamps 71 are connected with the lifting lugs 3 through fastening bolts 72 which sequentially penetrate through the jacks and the lifting lugs 3 and matched nuts, and therefore the lifting rope 4 is convenient to connect with and detach from the lifting lugs 3.

Referring to fig. 3, since the roof panel 8 has a weak structural strength and a crisp texture over several decades, it is likely to be broken during the dismantling process and fall into the room, which may cause a safety hazard. Therefore, in order to ensure the safe removal of the old roof, the present solution proposes that the method for removing the old roof panels 8 by using the brackets comprises the following steps:

and (3) dismantling the roof panels 8 from low to high in sequence, and before dismantling, cutting the joint of the seam of the roof panel 8 to be dismantled by using a cutting machine to separate the adjacent roof panels 8. And then the frame unit 6 is transported to the lower part of the roof panel 8 to be dismantled from the room, and is assembled and fixed. The position that corresponds lug 3 on old roof boarding 8 sets up four holes respectively, pass two holes respectively with the both ends of lifting rope 4, utilize mechanical fixture 7 to be connected with lug 3, establish lifting rope 4 hook on the lifting hook of crane, taut lifting rope 4, utilize the bracket to drag roof boarding 8, then with four angular point cutting separation of roof boarding 8 and steel roof truss welded, adopt the gas welding cutting during the cutting, avoid causing destruction to steel roof truss, influence its structural strength. After the cutting is completed, the old roof panels 8 are lifted upwards by the brackets and detached. After the first roof panel 8 is removed, the bracket is placed into a room from the hole of the first roof panel 8, the bracket is detached from the mechanical fixture 7, the bracket is moved to the position below the roof panel 8 to be removed, and the steps are repeated to remove the roof panel 8.

When the area of the roof is large, the suspension arms of the crane cannot completely cover the whole roof, and when the roof panel 8 which cannot be covered by the suspension arms of the crane is removed, the small portal frame is arranged on the roof, the lifting ropes 4 are connected with the electric block or the chain block on the portal frame, the old roof panel 8 is removed by the force applied by the electric block or the chain block, and then the roof is lifted off by the crane.

According to the method, when the old roof panel 8 is detached, the roof panel 8 is placed on the bracket, and the bracket is used as a main hoisting stress point, so that the roof panel is prevented from being directly hoisted on the old roof panel 8, and the roof panel 8 is prevented from being broken due to frangibility for a long time in the hoisting process to cause potential safety hazards.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. Bracket for renovating and transforming concrete roof of large building, which is characterized in that: the lifting device comprises two parallel horizontal rods (1), wherein cross rods (2) are fixedly arranged at two ends of each horizontal rod (1) respectively, rectangular frames are formed by the horizontal rods (1) and the cross rods (2), two lifting lugs (3) are fixedly arranged on the cross rods (2) respectively, and lifting ropes (4) are connected to the lifting lugs (3).

2. The bracket for renovating a concrete roof of a large building according to claim 1, characterized in that: a plurality of support rods (5) parallel to the cross rod (2) are fixedly arranged in the frame at intervals.

3. The bracket for renovating a concrete roof of a large building according to claim 2, characterized in that: the frame comprises a plurality of sections of frame units (6), two adjacent frame units (6) are respectively provided with a supporting rod (5) at the splicing position, a plurality of pairs of coaxially arranged threaded holes are formed in the supporting rods (5), and fixing bolts are arranged in the threaded holes in a penetrating mode to fix the two frame units (6).

4. The bracket for renovating a concrete roof of a large building according to claim 1, characterized in that: the lifting rope is characterized in that two ends of the lifting rope (4) are respectively connected with a mechanical clamp (7), the mechanical clamp (7) comprises a U-shaped clamp (71), two side walls of the U-shaped clamp (71) are provided with corresponding insertion holes, and the U-shaped clamp (71) is clamped on the lifting lug (3) and is connected with the lifting lug (3) through fastening bolts (72) which sequentially penetrate through the insertion holes and the lifting lug (3).

5. The bracket for renovating a concrete roof of a large building according to claim 1, characterized in that: two ends of the cross rod (2) respectively extend out of two sides of the frame.

6. The bracket for renovating a concrete roof of a large building according to claim 1, characterized in that: the horizontal rod (1) and the support rod (5) are made of square steel, and the cross rod (2) is made of H-shaped steel.

7. A method of demolishing a concrete roof of a large building using the bracket according to any one of claims 1 to 6, comprising the steps of: before dismantling, firstly cutting the seam joint of the roof panel to be dismantled, then conveying the bracket to the lower part of the roof panel to be dismantled on the roof from the indoor, respectively forming four holes at the positions corresponding to the lifting lugs of the bracket on the roof panel, penetrating the lifting rope positioned above the roof panel from the holes, connecting the lifting rope with the lifting lugs by using a mechanical fixture on the lifting rope, tensioning the lifting rope, dragging the roof panel by using the bracket, then cutting and separating the roof panel from the welding position of the steel roof truss, and upwards supporting and dismantling the old roof panel by using the bracket.

8. A method of demolishing a concrete ceiling of a large scale building using a bracket according to claim 7, wherein: the roof board and the steel roof truss are cut by gas welding.

9. A method of demolishing a concrete ceiling of a large scale building using a bracket according to claim 7, wherein: the roof panel is provided with a small portal frame, the lifting rope is connected with the hoisting equipment on the small portal frame, and the old roof panel is detached through the force applied by the hoisting equipment.