Full-section hydraulic blasting demolition method for urban viaduct

Abstract

The invention discloses a full-section hydraulic blasting demolition method for an urban viaduct. The method comprises the following steps: adding a built-in reserved hole design and a groove design; manufacturing and fixing a matched formwork to a bridge steel reinforcement framework through vertical pre-buried pipelines of stand columns, beams and plates of a bridge, and pouring concrete for one-time forming, wherein built-in large pre-buried holes are used for draining water, and the three small pre-buried holes are used for arranging lighting and communication lines and traffic monitoring cables; dismantling cables arranged in the three pre-buried small holes of each pier of the viaduct and using thes mall holes as compensation holes; performing explosive charging, networking, protecting and detonating, and using a high-precision delay detonator for controlling the detonating sequence of each bridge pier blasting point and a box girder water pressure blasting point; and when the viaduct continuously collapses span by span, dividing each section of box girder into three parts to collapse. According to the method, the blasting demolition drilling construction procedure is reduced, the drilling cost is reduced, the harmful effects of noise, dust and the like are reduced, the environmental protection property is high, the construction period is short, and the cost is low.

Description

Technical field [0001] The present invention relates to the field of engineering blasting test, and in particular, there is a method of removing a multi-section water pressure blasting removal method for urban elevated bridges. Background technique [0002] With the rapid development of urban construction, the pressure on transportation is increasing, and some urban viaducts need to be removed from the problem of insufficient traffic, engineering quality. Compared with the mechanical demolition, demolition blasting has the advantages of economic efficiency, safety and environment, and is widely used in urban elevated bridge demolition projects. [0003] The urban elevated bridge is multifaceted with a simple trunk beam structure, composed of upper continuous box girder and lower double-column bridge piers. At present, the urban elevated bridge blasting has less cases, mostly using continuous collapse explosion, that is, a plurality of blasting points are arranged on the pier colu...

AI Technical Summary

Problems solved by technology

When hydraulic blasting technology is used, a large amount of water medium is filled into the box body, resulting in an increase in the weight of the box girder, which not only poses safety hazards during the construction process, but also increases the ground vibration of the bridge body when it collapses

At the same time, in order to achieve the expected crushing effect, it is necessary to increase the amount of explosives and adopt a multi-point initiation method, which increases the consumption of blasting equipment and the generation of harmful effects of explosions.

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