Open cut tunnel vertical-digging, loosening and blasting method capable of effectively avoiding flying stones and reducing vibrations

Abstract

The invention discloses an open cut tunnel vertical-digging, loosening and blasting method capable of effectively avoiding flying stones and reducing vibrations. The open cut tunnel vertical-digging,loosening and blasting method comprises the following steps of: (1) pre-cracking and pre-blasting a region III, and then, drilling charged holes and empty holes of a region I and a region II; (2) adopting a positive continuous structure to charge the charged holes, breaking in holes for charging in a mode of spacing with the charged holes; (3) firmly connecting detonator cap wires, guaranteeing good electrifying and covering 0.5m thick sandy soil; (4) using a steel plate with a thickness of 30 mm to cover a blasted body, draining off water from the upper part to soak the steel plate by 0.5-1.0m; and (5) evacuating equipment, staff, animals and the like out of a safety distance, warning, blasting after safety is confirmed, re-checking 15 minutes after blasting, eliminating danger, and relieving warning after no danger is confirmed. The open cut tunnel vertical-digging, loosening and blasting method has the beneficial effects that: thick mud and wet clay can effectively absorb blasting energy, reduces blasting vibrations and reduces noises; and the steel plate is adopted to cover a blasting body, so that the boundary is pressed, the flying stones are effectively avoided, and safety in a construction area, a residential area and a plant is guaranteed.

Description

technical field [0001] The invention relates to the technical field of blasting, in particular to an open-hole vertical excavation loosening blasting method which effectively prevents flying rocks and reduces vibration. Background technique [0002] Blasting, using explosives to destroy structures, is very common in tunnel construction. In many tunnel constructions, open hole blasting is required. Open hole blasting can speed up the construction progress and improve the construction effect. [0003] In the tunnel of the Dalian Railway Hub Project, the open hole is more than 800 meters long, and the blasting site is very close to the residential area. In some places, the construction red line is close to the building, and the open hole blasting excavation is likely to produce a large number of flying stones, which splash everywhere. It brings great inconvenience to the protection work, and the flying rocks cannot be well controlled, resulting in great safety hazards. The near...

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Problems solved by technology

[0003] In the tunnel of the Dalian Railway Hub Project, the open hole is more than 800 meters long, and the blasting site is very close to the residential area. In some places, the construction red line is close to the building, and the open hole blasting excavation will easily produce a large number of flying stones, which will splash everywhere It brings great inconvenience to the protection work, and the flying rocks cannot be well controlled, resulting in great safety hazards. The nearby residents and factory workers often block the work, and the construction progress is extremely unsmooth, causing great economic losses to the construction unit.

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