Efficient shock absorption blasting and excavation method adopting fishbone-shaped construction guide grooves for large rock deep foundation pit in dense building area

Abstract

The invention discloses an efficient shock absorption blasting and excavation method adopting fishbone-shaped construction guide grooves for a large rock deep foundation pit in a dense building area. The efficient shock absorption blasting and excavation method is characterized in that excavation is conducted according to the following sequence: a, shock absorption holes are drilled in the outer rim of the foundation pit, and reserved protection belts are arranged; b, a main construction guide groove is excavated in the dense building direction through a shallow hole loosening and blasting method; c, in the positions perpendicular to the main construction guide groove, two or more auxiliary construction guide grooves are excavated facing the two sides of the main construction guide groove, and therefore the main construction guide groove and the auxiliary construction guide grooves form the fishbone shape; d, a middle-deep hole control blasting method is adopted, blasting and expanded-excavation are conducted on the rock among the auxiliary construction guide grooves; e, the reserved protection belts are excavated to the rim of the foundation pit by the adoption of the mechanical excavation method; f, support is conducted on the wall of the foundation pit; and h, layered excavation of the foundation pit is conducted by executing the steps of b to e in a looping manner. By the adoption of the efficient shock absorption blasting and excavation method, the excavation efficiency of the large foundation pit can be improved, and the influence of blasting and vibration on the surrounding buildings is lowered.

Description

technical field [0001] The invention belongs to the technical field of earth-rock excavation engineering, and in particular relates to an efficient shock-absorbing blasting excavation method for a fishbone-shaped construction guide groove of a large rocky deep foundation pit in a densely built area. Background technique [0002] With the advancement of my country's urbanization process, urban land use is becoming increasingly tight, and the scale of urban underground space development and utilization is increasing. However, the development and utilization of large underground spaces often require the excavation of large foundation pits. In the central area of ​​the city, large-scale foundation pits are often located in densely built areas, and the construction of foundation pits will release the stress of the ground, which will cause deformation of adjacent buildings. When excavating rocky foundation pits, it is often necessary to use blasting for excavation, and blasting vi...

AI Technical Summary

Problems solved by technology

However, these construction techniques can only partially control blasting hazards, and the cumbersome control techniques reduce construction efficiency, and it is difficult to solve the dual requirements of large-scale foundation pit construction efficiency and hazard control from a macro perspective.

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