Controlled Blasting Excavation Method Using Formation of Multiple Free Surfaces

摘要

The present invention relates to a controlled blasting excavation method using the formation of a plurality of free surfaces. In order to form a multi-free surface in the center or the center of the target tunnel to be excavated for this purpose, the free surface forming hole 10 is drilled at regular intervals (Φ 150-400 mm) or the free surface forming hole 10 is formed. Concatenation perforation (20) (Φ75 ~ 125mm) step; Perforating a plurality of halam holes (large diameter) 30 or long yak holes (small diameter) 40 holes around the free surface forming hole 10 or the connecting hole 20; By inserting the granulation means of the hydraulic granule rod or the wedge-shaped jack rod into the holes of the plurality of granulation holes (large diameter) 30, the gap between the holes of the granulation hole (large diameter) 30 is relaxed by a tension crack (halam crack line) 50 Shortening the resistance line and forming a plurality of free surfaces; Charging a predetermined amount of explosives or micro-vibration chemicals into the holes of a plurality of charging holes (small diameter) 40 together with a detonator; And injecting clay or sand into the charged hole (small diameter) 40 to form a full color part, and using industrial gunpowder or micro-vibration chemicals charged in the charging hole (small diameter) 40 as a detonator. It includes a step of crushing the rock mass by detonation. The present invention configured as described above is used in excavation under conditions where free surfaces are insufficient, such as an underground space (for example, a tunnel, etc.). By forming a free surface in the hole in the hole in the hole in the large diameter, the binding force of the rock in the hole in the hole in the hole in the hole in the hole in the hole in the long hole (small diameter) is reduced. Controlled blasting excavation method (TMR&B) (TMR&B: Tunnel Method of using the Rock splitting and Blasting) is provided, and this is implemented as an eco-friendly method with reduced noise, vibration, and scattering, and mechanical excavation and conventional It is intended to prolong the period of rock excavation in tunnels caused by explosive blasting and to minimize civil complaints about environmental pollution.