Method for dismantling large-section concrete box girders and hoisting device

A technology of concrete box girder and hoisting device, which is used in transportation and packaging, load hanging components, building maintenance, etc. The effect of reducing and reducing risk

Active Publication Date: 2013-10-09
SHANGHAI MECHANIZED CONSTR GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This method has poor applicability in the demolition of large-section concrete box girders. First, the concrete box girder has a large section, and the weight of a single piece after cutting is heavy. It is highly dependent on the hoisting site and hoisting machinery, and the hoisting risk is high; secondly, the box girder section Irregularity, it is difficult to determine the center of gravity, and the steel wire rope is easy to cause the box girder to become unstable; finally, the steel wire rope is extremely sensitive to friction under high stress conditions, and the steel wire rope in contact with the concrete during the hoisting process is easy to break due to frictional contact

Method used

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  • Method for dismantling large-section concrete box girders and hoisting device

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Embodiment 1

[0031] Please refer to figure 1 , the present invention provides a method for dismantling a large-section concrete box girder, the concrete box girder is supported by several steel pipe columns 4, the concrete box girder includes a closing section 3 and an independent section 2, and the independent section 2 is connected to the The steel pipe column 4 is connected, and each independent section is divided into two halves by a steel pipe column 4, the independent sections 2 are connected by the closing section 3, and the two ends of the concrete box girder are connected by two Each balance segment 1 is connected to the outside, and the two balance segments 1 are connected to the independent segment 2 at the corresponding position.

[0032] Please refer to figure 2 with image 3 , and combined with figure 1 , the removal method includes:

[0033] First, remove the closed section 3 or the balanced section 1 at both ends of one of the independent sections 2;

[0034] Then, cu...

Embodiment 2

[0046] Please refer to Figure 10 , the difference between this embodiment and embodiment 1 is that when the cutting segment is divided into three segments, the distribution direction of the three segments of each cutting segment is along the horizontal direction and along the axial direction of the beam set up.

[0047] In summary, the present invention solves the problems of heavy hoisting weight of large-section concrete box girders, high hoisting site and mechanical requirements by reasonably subdividing large-section box girders, and reduces the risk of concrete box girder hoisting. The special steel structure hoisting tool of the invention is suitable for hoisting concrete box girders with special-shaped cross-sections after cutting, and has strong field operability and high hoisting reliability. The invention not only realizes the symmetrical cutting of the concrete box girders at both ends of the independent section, but also further divides the cutting section during...

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Abstract

The invention provides a method for dismantling large-section concrete box girders and a hoisting device. The method for dismantling the large-section concrete box girders comprises the steps of S1, dismantling a closure section or a balance section at the two ends of one independent section, S2, cutting the independent section starting from the two ends of the independent section and cutting the concrete box girders at the two ends of the independent section symmetrically, S3, dividing the independent section into a plurality of cutting sections in the axial direction of the box girders and cutting the independent section, cutting the concrete box girder on each cutting section into three cutting blocks before cutting the cutting sections, hoisting the three cutting sections in batches, S4, hoisting the cutting blocks to be cut with the hoisting device before cutting the independent section, and hoisting the cutting sections which are cut off with the hoisting device. The method for dismantling the large-section concrete box girders is effective, safe and suitable for large-section concrete box girders which are heavy after cutting.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a method for removing a large-section concrete box girder and a hoisting device. Background technique [0002] With the rapid increase of urban traffic volume and traffic axle load, most of the existing bridges have suffered from diseases, some bridges have been reinforced and continue to be used, and most bridges have been demolished and rebuilt to meet the requirements of urban heavy-duty traffic. "Building bridges is easy, but dismantling bridges is difficult" has been widely recognized by the industry. Bridge-building related technologies have matured, while dismantling bridges is in the stage of process technology exploration and experience accumulation. At present, bridge demolition mainly includes the method of full support, block cutting, directional blasting and overall jacking. Among them, the block cutting method is widely used in bridge demolition due to its adva...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D24/00B66C1/64
Inventor 裘水根洪成泼丁健
Owner SHANGHAI MECHANIZED CONSTR GRP
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