A full-section hydraulic blasting demolition method of an urban viaduct

Abstract

The invention discloses a full-section hydraulic blasting demolition method of an urban viaduct, comprising: adding a built-in reserved hole design and a groove design; using the vertical pre-buried pipes of the bridge columns, beams and plates to make a matching template and fix it on the The reinforced skeleton of the bridge is formed by pouring concrete at one time; the built-in large pre-buried holes are used for drainage, and the three pre-buried small holes are used to arrange lighting, communication lines, and traffic monitoring cables; the three pre-buried small holes of each pier of the viaduct are dismantled and arranged in the three pre-buried small holes The cables are used as compensation holes; high-precision delayed detonators are used for charging, networking, protection, and detonation to control the detonation sequence of the blasting points of each pier and the hydraulic blasting points of the box girder; The beam was split into three parts and collapsed. The invention reduces the blasting and demolition drilling construction process, reduces the drilling cost, reduces the harmful effects such as noise and dust, and has high environmental protection, short construction period and low cost.

Description

technical field [0001] The invention relates to the technical field of engineering blasting tests, in particular to a full-section hydraulic blasting demolition method of an urban viaduct. Background technique [0002] With the rapid development of urban construction, the traffic and transportation pressure is increasing, and some urban viaducts need to be demolished and rebuilt due to insufficient traffic capacity and engineering quality. Compared with mechanical demolition, demolition blasting has the advantages of economical efficiency, safety and environmental protection, and is widely used in urban viaduct demolition projects. [0003] Most of the urban viaducts adopt a simply supported box girder structure, which consists of an upper continuous box girder and a lower double-column pier. At present, there are few cases of blasting demolition of urban viaducts, and most of them are the span-by-span continuous collapse blasting method, that is, multiple blasting points a...

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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