Combined time-delay partition differential initiation network inside and outside the hole in tunnel blasting

Abstract

The invention discloses an expanded excavation region hole inside and outside combined delayed regional differential blasting network in tunnel blasting. The network is characterized in that blasting excavation is performed by using a three-step method for an underground excavated metro interval tunnel underneath passing historical and cultural relic buildings; longitudinally excavating along the tunnel to form an upper step, a middle step and a lower step in sequence; arranging the expanded excavation region hole inside and outside combined delayed regional differential blasting network, i.e., dividing an upper step expanded excavation region according to upper, middle, lower, left and right structures, forming synchronous blasting sections in two to four adjacent blast holes in each divided region by using an identical section detonator, and blasting section by section by using detonators of different sections between different synchronous blasting sections. The network can guarantee that the blasting vibration viscosity of the construction section underneath passing the historical and cultural relic buildings meets the related requirements, the historical and cultural relic buildings are protected from being damaged, and the construction progress is guaranteed.

Description

technical field [0001] The invention relates to a blasting control shock absorption method, more specifically to the shock absorption control method adopted in the blasting of tunnels passing through cultural relics protection buildings, in order to reduce the damage caused by the harmful effect of blasting vibration to ground cultural relics protection buildings. Background technique [0002] With the vigorous development of my country's urban subways, more and more subway projects have been constructed through the bustling urban areas by using the drill and blast method, and some cities still have a large number of national-level cultural relics protection buildings. The harmful effects of vibration generated by the blasting may endanger the surrounding buildings, especially the ancient cultural relics protection buildings. How to effectively control the harmful effects of blasting vibration and ensure the safety and smooth construction of cultural relics protected buildin...

AI Technical Summary

Problems solved by technology

[0005] In engineering blasting, there are many single shock-absorbing measures, but in the case of using a single shock-absorbing measure, when the distance between the protected point and the blasting area is 20m, the blasting vibration velocity of the measuring point is 2-5cm / s, which is Obviously far from meeting the control requirements of 0.5cm / s

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