Controlled blasting construction method in mountain excavation close to expressway side

Abstract

The invention provides s a controlled blasting construction method in mountain excavation close to the expressway side mainly in order to solve the problem that an existing blasting method cannot guarantee safety of an expressway, a common road and village houses around a mountain. The specific construction method includes the steps that step deep hole blasting is adopted for stonework of a subgrade of the mountain, pre-splitting blasting and smooth blasting are adopted for a slope, step narrow hole blasting is adopted for a high-danger excavation road segment, and a blast area is covered with a blasting protection quilt; according to the construction sequence, a protective frame bent is made on the side close to an existing road before construction, the height of the frame bent is 2 m higher than the height of the blasting mountain, and the frame bent is firmly connected to an anchor rod implanted in the mountain; according to the blasting construction sequence, the longitudinal direction of a circuit is arranged according to the length of a blasting circuit, grooving construction of the mountain is firstly performed on the side close to the mountain, then, excavation construction of the mountain close to the road side is performed, and the grooving depth is twice that of the blasting height of the free face of the mountain. The mountain is sequentially constructed from top to bottom and from inside to outside. The method has the advantage that safety of the expressway, the common road and the village houses around the mountain can be guaranteed.

Description

Technical field: [0001] The invention relates to the field of controlled blasting construction methods, in particular to a construction method for controlled blasting in the excavation of mountains near expressways and existing roads. Background technique: [0002] Controlled blasting refers to a blasting method that strictly controls the blasting energy and blasting scale through certain technical measures, so that the blasting sound, vibration, flying stones, dumping direction, damaged area, and the range of broken objects are within the specified limits. [0003] With the continuous development of national railway construction, especially the construction of new railway lines near the existing highways and existing highways is increasing, and sometimes there will be damage to existing ordinary highways due to the occupancy of super large bridge piers. There are cases where ordinary roads are relocated, and the super-large bridge piers are located near expressways and moun...

AI Technical Summary

Problems solved by technology

Therefore, it is urgent to study a construction method of controlled blasting in the excavation of the mountain near the expressway to solve the problem of not only protecting the operation safety of expressways and ordinary roads, but also protecting the safety of surrounding village houses.

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