Municipal engineering hard rock tunnel carbon dioxide fracturing device excavation blast hole arrangement structure and blasting excavation process

Abstract

The invention discloses a municipal engineering hard rock tunnel carbon dioxide cracking device excavation blast hole arrangement structure and a blasting excavation process, and the municipal engineering hard rock tunnel carbon dioxide cracking device excavation blast hole arrangement structure comprises an upper step working face and a lower step working face. Corresponding blast holes are formed in the upper step working face and the lower step working face, and according to the municipal engineering hard rock tunnel carbon dioxide cracking device blasting excavation technology, the upper step working face is blasted firstly, and then the lower step working face is blasted. According to the blast hole arrangement method, the carbon dioxide cracking device is adopted for blasting hard rocks, vibration of blasting of the carbon dioxide cracking device is small compared with explosive blasting, destructive seismic waves cannot be generated, according to the blast hole arrangement method, the carbon dioxide cracking device is not installed in the empty hole, a certain free face and a certain compensation space are provided for blasting of the slotting cracking hole, and the blasting efficiency is improved. The empty hole effect of empty holes can be fully utilized, and the blast hole utilization rate is increased; and the axes of the slotting fracturing holes are obliquely crossed with the working surface, so that rocks close to the free surface can be thrown out.

Description

technical field [0001] The invention relates to the technical field of tunnel construction. Specifically, it is the layout structure of blast holes and blasting excavation technology of carbon dioxide cracker excavation for municipal engineering hard rock tunnels. Background technique [0002] Rock-breaking technology is widely used in mining engineering, metallurgical engineering and other fields. For a long time, explosive blasting has been the main means of breaking rocks. However, in special cases, the adverse effects of explosive blasting limit its application; such as in municipal engineering hard rock tunnels During the construction, since the hard rock tunnel of the municipal project is located under the downtown area of ​​the city, its excavation not only has high requirements for environmental protection, but also needs to strictly control the vibration speed of the surface buildings. When the excavation of the municipal project tunnel encounters hard rock When , ...

AI Technical Summary

Problems solved by technology

[0002] Rock-breaking technology is widely used in mining engineering, metallurgical engineering and other fields. For a long time, explosive blasting has been the main means of breaking rocks. However, in special cases, the adverse effects of explosive blasting limit its application; such as in municipal engineering hard rock tunnels During the construction, since the hard rock tunnel of the municipal project is located under the downtown area of ​​the city, its excavation not only has high requirements for environmental protection, but also needs to strictly control the vibration speed of the surface buildings. When the excavation of the municipal project tunnel encounters hard rock When the explosive blasting cannot meet the above requirements, it cannot meet the safety construction requirements

Images