Explosion method for demounting bridge

Abstract

The invention discloses an explosion method for demounting a bridge. The method comprises the following steps that (1) drilling is carried out; (2) powder filling and tamping are carried out; (3) piers and other explosion positions are protected through a double-layer protection material, a layer of bamboo board is additionally arranged on the outer side, a layer of bamboo board is laid on the bridge deck, and a layer of sand bags presses the bamboo board; (4) equipment or buildings nearby are covered with sand bags; (5) bamboo boards or double-layer dense screens are hung around the bridge for shielding protection; (6) three detonating cords are arranged on each of the two sides of the bridge, after the two ends of each detonating cord are connected through a rope, the detonating cords are fixed towards both banks, stone is hung on the detonating cords every other section for assisting in sinking, the detonating cords are obliquely pulled through the ropes fixed to the bridge to reduce the bending radian of the detonating cords; and (7) the detonating cords are delayed to be detonated when the bridge is exploded. According to the explosion method, flying stone and dust generated by explosions can be effectively controlled.

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...

AI Technical Summary

Problems solved by technology

In the blasting demolition of structures, small-diameter drilling blasting is generally used for components, and large-diameter charging blasting is generally used less. Small-diameter drilling blasting has a large number of drill holes, consumes more blasting equipment, and has a more complicated blasting network. Low operating efficiency and poor quasi-explosiveness. Due to the high concentration of charge in large-aperture charge blasting, a large amount of flying stones and dust will be generated during the blasting process. If not treated, it will bring safety hazards and cause environmental pollution.

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