A blasting method for bridge demolition

Abstract

The invention discloses a blasting method for demolition of bridges. The method comprises the following steps: (1), drilling; (2) filling with powder; For protection, add a layer of bamboo fence on the outside, lay a layer of bamboo fence on the bridge surface, and then press a layer of sandbags; (4), cover nearby equipment or buildings with sandbags; Hang bamboo fences or double-layer dense-mesh nets around for shelter and protection; (6), set three strip-shaped medicine bags on both sides of the bridge, connect the two ends with ropes and fix them to the two banks, and install the strip-shaped medicine bags every other section. Hang a stone to help sinking, and every other section is obliquely pulled with a rope fixed on the bridge to reduce the bending arc of the strip charge; (7), delay detonating the strip charge when the bridge is blasted; Effective control of flying rocks and dust.

Description

technical field [0001] The invention relates to the technical field of bridge blasting, in particular to a blasting method for demolishing bridges. Background technique [0002] With the rapid development of our country's economy, the traffic flow of roads has increased rapidly, and the requirements for the use and bearing capacity of existing road and bridge structures are also getting higher and higher. Many bridge structures have been overwhelmed by heavy traffic, and some have exceeded the design. Some bridges have become dangerous due to various reasons, and they are all facing the situation of reinforcement, reconstruction, demolition and reconstruction. Large-aperture charge blasting is generally used in large-scale earthwork blasting and blasting mining of various rocks and mines, and it is also used in large-scale foundation pit excavation. In the blasting demolition of structures, small-diameter drilling blasting is generally used for components, and large-diamete...

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