A kind of parallel slope surface buffer hole deep hole slope pre-split blasting construction method

Abstract

The invention discloses a parallel slope face buffering-hole deep-hole side slope presplitting blasting construction method. The presplitting blasting construction method comprises the following steps of construction preparation, removal of surface soil and scum, staking out in survey, arrangement of holes, fabrication of a slope rule, installation of a slope face calibrating rack, drilling of holes, fabrication of presplitting blasting gunpowder packets, charging of gunpowder, blocking, connection of a blasting network, blasting warning, igniting and blasting, checking after blasting and removal of the warning and digging and shipping of the blasting scum. According to the parallel slope face buffering-hole deep-hole side slope presplitting blasting construction method, the gunpowder charging structure is changed, and the side slope presplitting blasting one-off molding technology is adopted, so that reduction of blasting secondary disasters in a main blasting area is facilitated. A presplitting hole is in transition and connection with main blasting holes through a buffering-hole which is parallel to the presplitting hole; and within a certain relative position range, the presplitting hole is firstly blasted, then the main blasting holes are blasted, and finally the buffering-hole is blasted. After the side slope presplitting hole is blasted, a presplitting crack along the slope face is formed, the further extension of blasting cracks transmitted by the main blasting area towards an outline face can be effectively obstructed, and the blasting disturbance is obstructed.

Description

technical field [0001] The invention belongs to the technical field of building construction engineering, and in particular relates to a pre-splitting blasting construction method for deep hole slopes with buffer holes on parallel slopes. Background technique [0002] At present, in the process of excavating highway subgrades by drilling and blasting method in my country, there is a common phenomenon that the blasting construction of high side slopes of subgrades is rough. The slope shall be repaired by means of small-aperture shallow-hole blasting. Because the diameter of the down-the-hole drill used in deep hole blasting is relatively large, basically more than Φ90mm, and the diameter of the cartridge used is more than Φ70mm, resulting in excessively large blasting crushing circles, rupture circles and loosening circles, and secondary hazards such as blasting cracks expanding in a large range , The blasting disturbance is large, and the pre-splitting blasting charge is not...

AI Technical Summary

Problems solved by technology

Because the diameter of the down-the-hole drill used in deep hole blasting is relatively large, basically more than Φ90mm, and the diameter of the cartridge used is more than Φ70mm, resulting in excessively large blasting crushing circles, rupture circles and loosening circles, and secondary hazards such as blasting cracks expanding in a large range , The blasting disturbance is large, and the pre-splitting blasting charge is not specially processed for the slope hole, resulting in serious over-excavation of the slope, loss of blocks, and uneven rocks on the slope surface. Small-scale landslides and even landslide accidents occur from time to time, and the risk elimination and heavy workload seriously affect the construction quality, safety, progress and later driving safety

Images