Urban deep foundation pit shallow layer loosening control blasting construction method

Abstract

The invention discloses an urban deep foundation pit shallow layer loosening control blasting construction method. The control blasting construction method is characterize in that a blasting investigation scheme comprises the steps of construction early-stage preparation, measurement positioning and trial blasting, a blasting design scheme comprises the steps of blasting mode control through adopting step loosening of deep holes and shallow holes, drilling design, blasting explosive unit consumption calculation and detonation network design, and a blasting construction scheme comprises the steps of drilling and acceptance, hole depth measurement and blast loading, line connection and blast hole blockage, blasting warning and blasting effect inspection. According to the urban deep foundation pit shallow layer loosening control blasting construction method, blasting vibration effects can be effectively reduced, flying stones are controlled, and meanwhile the influence of blasting air shock waves on the surrounding environment is reduced, and the problems of foundation pit slope collapse, super explosion, blind shot, hurt to people by flying stones, difficulty in excavation and the like are solved; and therefore the method has high safety and economic efficiency, is easy to popularize and can be suitable for foundation pit rock stratum loosening blasting in low 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...

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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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