One-time forming blasting method for extra-high voltage electric transmission line pile-well

Abstract

The invention provides a one-time forming blasting method for an extra-high voltage electric transmission line pile-well for the excavating engineering of the extra-high voltage electric transmission line pile-well (the depth is not larger than 10 meters), wherein the one-time forming blasting method combines large-angle double-energy-gathered pre-split blasting, high-precision digital detonator layered hole-by-hole blasting and mid-depth hole water pressure blasting. The one-time forming blasting method is characterized in that all the designed blastholes of the pile-well are drilled and completed at a time; after the blastholes are loaded with gunpowder, the blastholes are ignited at a time; delay blasting is performed zone by zone and layer by layer; and the whole pile-well is blasted and formed at a time. Compared with the prior art, the pile-well blasting completing one-time hole drilling and one-time blasting and forming is achieved, the manual underground work amount and time for excavation of the extra-high voltage electric transmission line pile-well are obviously lowered, the number of blasting times is greatly reduced, traditional multiple times of cycle blasting are turned into the one-time igniting blasting, and the safety risk of the construction process is lowered.

Description

technical field [0001] The invention belongs to the technical field of pile well blasting, and in particular relates to a one-time forming blasting method for pile wells of ultra-high voltage transmission lines. Background technique [0002] At present, the foundation excavation of power transmission and transformation projects often adopts excavated pile wells, and rocky sections need to be excavated by blasting. Small section (less than 10m 2 ) medium-deep (less than 10m) pile wells are excavated by blasting, which accounts for a large proportion in the construction of high-voltage line pile wells. Zhang Yiping of Central South University proposed the vertical shaft deep-hole layered blasting method (discussion and application of vertical shaft deep-hole layered blasting method, Zhang Yiping, Chen Shouru, Wang Maoling, Mining Technology, 2002.06), on the excavation rock surface of shafts or similar shafts , use deep hole rock drilling equipment to drill large-diameter ve...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: aiming at the excavation project of pile wells (depth not greater than 10m) of UHV transmission lines, to solve the problem of many blasting construction cycles, large number of drilling holes, low utilization rate of blastholes, and explosives in the excavation of pile wells. High consumption and high construction risk

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