Rapid Demolition Method of Expressway Arch Overpass by Controlled Blasting

Abstract

The invention provides a rapid controlled blasting demolition method for an arch-shaped highway over-line bridge. The rapid controlled blasting demolition method comprises the following steps that a blasting construction scheme is designed; blast holes are deployed and controlled; the traffic is closed, and road surface protection is performed; blasting powder is loaded, and leads are connected; safety alerting is performed; detonation is performed; a bridge body is separated by cutting; road surface clearing is performed. The rapid controlled blasting demolition method has the advantages that most work (for instance, blast hole deploy and control) of demolition construction is performed under the condition of normal vehicle traffic, the demolition time is saved, the speed is high, and lines can keep unobstructed; as disintegration is relatively sufficient after the bridge body collapses, the demolition time is short; during blasting demolition, all components are broken and deform synchronously, and the collapse range is concentrated; long-distance detonation control is performed, so safety is good; from traffic closing to traffic restoration, it usually takes 6-8 hours, management is facilitated, blasting demolition of multiple overbridges of the whole line can be achieved at the same time, and the construction period can be effectively shortened.

Description

technical field [0001] The invention belongs to the technical field of architecture and civil engineering, and in particular relates to a controlled blasting rapid demolition method for an arch-type overpass bridge of an expressway. Background technique [0002] With the development of our country's economy and the progress of society, the original expressway can no longer meet the development requirements of the existing economy, and its traffic flow and load have greatly exceeded the original design requirements. Some highways are designed to be widened and expanded, so as to improve their traffic flow and use functions. [0003] In the process of expressway widening and expansion, the overpass designed on the original expressway must be demolished. The main structural forms of flyover bridges include continuous rigid frame, rigid frame with oblique legs, simply supported hollow slab, cast-in-place continuous beam and arch bridge, etc. Since different types of flyover bri...

AI Technical Summary

Problems solved by technology

However, the above method is only applicable to flyover bridges with slanted-leg steel structures and simply supported hollow slab structures, and is not fully applicable to arched flyover bridges, and there are problems such as long construction time, long time for temporary traffic closure or temporary rerouting, and safety issues. high risk etc.

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