Method for blasting construction of upper and lower fracture surfaces in IV/V-class surrounding rock through three-arm jumbo drill

Abstract

The invention belongs to the technical field of tunnel rock construction and particularly relates to a method for blasting construction of upper and lower fracture surfaces in IV / V-class surrounding rock through a three-arm jumbo drill. According to the method, the upper and lower fracture surfaces are excavated through smooth blasting, and the features of high speed, precise positioning and high security of the three-arm jumbo drill are fully utilized, so that the blasting drilling time is short and the angle of outward insertion is easy to control; steps of the upper and lower fracture surfaces are subjected to parallel crossing operation, it can be ensured that primary bracing is completed as early as possible by combination with the quick guniting technology of wet spraying machinery later, and the bearing capacity of the primary bracing is brought into full play; the construction quality is improved and the operation environment is perfected by means of matched mechanical equipment.

Description

technical field [0001] The invention belongs to the technical field of tunnel rock mass construction, and in particular relates to a method for blasting construction of upper and lower sections in Class IV / V surrounding rock by using a three-arm rock drilling jumbo. Background technique [0002] At present, there are more and more constructions of tunnels and underground projects, the drilling and blasting method is dominant, and the mechanical construction technology is still immature. In addition to the low strength of the surrounding rock and the low anti-disturbance ability, large landslides are prone to occur during construction, and the side walls are prone to instability. How to quickly and safely construct large-scale machinery in the tunnel and seal it into a loop in time has become the focus of research. [0003] The three-arm rock drilling jumbo is generally suitable for the excavation of large-section tunnels. In tunnels with grade IV and V surrounding rocks with...

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Problems solved by technology

[0002] At present, there are more and more constructions of tunnels and underground projects, the drilling and blasting method is dominant, and the mechanical construction technology is still immature. In addition, the strength of the surrounding rock is low, and the anti-disturbance ability is low. During construction, large landslides are prone to occur, and the side walls are prone to instability. How to quickly and safely construct large-scale machinery in the tunnel and timely seal and form a loop has become the focus of research.

[0003] The three-arm rock drilling jumbo is generally suitable for the excavation of large-section tunnels. In tunnels with grade IV and V surrounding rocks with poor geological conditions, the upper and lower sections are generally drilled and blasted by hand-held pneumatic rock drills. Slow speed, high energy consumption, serious over and under excavation, and harsh working environment

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