Construction method of shallow loosening controlled blasting in deep foundation pits in cities and towns

Abstract

The invention discloses a blasting construction method for shallow layer loosening control of deep foundation pits in cities and towns. The blasting survey plan includes pre-construction preparation, measurement and positioning, and blasting tests; Drilling design, calculation of blasting explosive unit consumption, detonation network design; the blasting construction plan includes drilling and acceptance, measuring hole depth and loading guns, connecting lines and blast hole plugging, blasting warning and blasting effect inspection. The invention can effectively reduce the blasting vibration effect, control flying rocks, and reduce the impact of blasting air shock waves on the surrounding environment; it solves the problems of foundation pit slope collapse, over-explosion, blind blasting, flying rocks hurting people, and difficulty in excavation. Difficult problems; it has high safety, economy and easy promotion, and is suitable for loose blasting of rock formations in foundation pits in low mountain and hilly areas.

Description

technical field [0001] The invention relates to building construction technology, in particular to a construction method of blasting construction method for shallow layer loosening control of deep foundation pits in cities and towns. Background technique [0002] With the vigorous development of housing construction and other engineering construction in my country, the construction of hills and other mountainous areas is also continuing. In view of the particularity of urban rock geology, deep foundation pits and shallow loosening control blasting construction, conventional open-air foundation pit stonework cannot be used. Construction by blasting method. Conventional blasting is often unfavorable to urban earthwork construction, often accompanied by broken slopes, large over-explosion range, large over-excavation gravel, and many flying rocks, causing safety hazards, and the blasting vibration effect has a negative impact on the surrounding rock mass, buildings and structure...

AI Technical Summary

Problems solved by technology

[0004] For example, the application number is 201610718418 "A Construction Method for Underwater Trench Pre-splitting Blasting".

[0005] Another example is the utility model patent of "A Protective Structure for Finished Products of Deep Foundation Pit Blasting Construction" with the application number 201620915849. It is aimed at implementing blasting projects for deep foundation pits with dense supports, columns, dewatering wells and other finished products. The construction process is complicated and the construction is difficult. , large and numerous construction machines, high cost and other problems and shortcomings

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