A blasting method for a separate upper-span bridge

Abstract

The invention discloses a blasting method of a separated type overpass. The blasting method of the separated type overpass includes the steps that (1) blasting cuts are designed, specifically, the blasting cuts are designed in the arch apex, arch soffits and arch feet of a bridge main arch ring correspondingly, and the blasting cuts are designed in part of stand columns of bridge small arch rings; (2) blasting points are designed, specifically, the multiple blasting points are designed on the bridge main arch ring and the small arch rings; (3) a blasting sequence is set, specifically, the arch apex, the arch feet, the arch soffits and the stand columns of the bridge are blasted in sequence; (4) blasting is performed, specifically, the bridge is blasted in the blasting sequence of the step (3); and (5) site cleaning is performed, specifically, ballast built after bridge blasting is cleaned up, and bridge blasting is completed. By means of the blasting method of the separated type overpass, the weight of a single blasted body can be effectively reduced, and the influence of dismantled bodies on the road surface and an underground pipeline is small; and during construction, a pre-treatment link of blasting construction is omitted, the whole structure of the bridge is not damaged, the traffic safety in the construction process is guaranteed, the whole road closure time is shortened, and the blasting method is safe, reliable and high in efficiency.

Description

technical field [0001] The invention relates to the technical field of blasting engineering, in particular to a blasting method for a separated upper-span bridge. Background technique [0002] With the rapid development of the domestic economy, in order to meet the increasing traffic requirements, many expressways need to be expanded and reconstructed, and a large number of overpasses that cross expressways need to be demolished for various reasons. For the demolition of expressway overpasses, different demolition methods must be selected according to its own characteristics and environmental factors, and the impact on vehicle traffic must also be considered. At present, the demolition of the upper span of the hingeless reinforced concrete slab arch bridge mostly adopts the static cutting method and the mechanical demolition method, and there are few reports on the demolition of this kind of arch bridge by blasting technology. [0003] For the above-mentioned static cutting...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the conventional static cutting method and mechanical demolition method existing in the prior art, which need to close the road for a long time when demolishing the bridge, and at the same time, the existing demolition method combined with cutting blasting and drilling blasting brings unexpected problems. To deal with the above-mentioned shortcomings of troublesome operation of cutting steel bars, large blasting bridge blocks, and easy damage to the road surface, a separate upper span can be provided that reduces the pretreatment process, effectively reduces the single volume of the blasting body and saves the demolition time bridge blasting method

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