Pre-splitting hole drilling powder charging method for underwater rock plug blasting

Abstract

The invention provides a pre-splitting hole drilling powder charging method for underwater rock plug blasting. The method includes the steps of (1) drilling parameter calculating and labeling, (2) positioning steel pipe arranging, (3) hole drilling, (4) hole cleaning, (5) drilling direction and hole depth detecting, (6) powder charging, (7) detonator foot wire and detonating fuse fixing and (8) pre-splitting hole blocking. A positioning half-pipe precise positioning technology is adopted in the method, the drilling accuracy is high, and the formed outline after blasting is good. The guaranteeing degree of drilling powder charging is high, rapid and accurate powder charging can be achieved, especially when poor geologies and water seepage holes exist, blast holes cannot be influenced by external condition changes, high-quality powder charging can be still performed smoothly, the blocking speed is high, the quality is good, and therefore the blasting effect can be effectively guaranteed. The drilling accuracy is high, the process is simple, and the cost is low. An original rapid plugging agent is high in condensation rate, plugs are high in intensity, and the problem that due to the fact that at present, blast hole plugs for underwater rock plug blasting can be damaged by seepage water easily and even be rushed out of the holes gradually after being soaked, the plugging effect fails is solved.

Description

technical field [0001] The invention relates to a method for charging explosives in drilling holes, in particular to a method for charging explosives in pre-split holes for underwater rock plug blasting. Background technique [0002] The pre-splitting holes for underwater rock plug blasting are generally arranged around the design contour of the rock plug section, and all of them are spatially inclined holes. The drilling and charging of the holes is difficult and requires high precision. The quality of the construction is directly related to the final result of the rock plug blasting. Forming and protective effect on the surrounding rock mass. At present, the pre-splitting holes of underwater rock plug blasting generally use manual wind drills or hole drills. After measuring and setting out, use ordinary scaffolding to position and then drill holes. This process has low drilling accuracy and poor drilling quality assurance; Drilling holes with special sample holders is com...

AI Technical Summary

Problems solved by technology

At present, the pre-splitting holes of underwater rock plug blasting generally use manual wind drills or hole drills. After measuring and setting out, use ordinary scaffolding to position and then drill holes. This process has low drilling accuracy and poor drilling quality assurance; Drilling holes with special sample holders, this process is more complicated and costly

Especially when the hole depth exceeds 8m, the centralizer is generally not installed, so the drilling quality is poor

It is easy to collapse the hole before or during the charging process, drop slag, and gravel deposits caused by water seepage, etc., so that the hole cannot be filled, and the hole needs to be cleaned again, or even re-drilled in severe cases.

After the hole is drilled, the powder rolls are tied to the bamboo slices and sent directly into the hole. This method of charging the powder is extremely inconvenient, and then yellow mud, rock powder or a mixture of yellow mud and sand are used as blasting mud to block the blast hole. Low strength, which will affect the blasting effect

Especially for the blast hole with water seepage, because it can’t condense quickly and its bonding strength is low, it is easy to be damaged by water seepage, and even it is gradually washed out of the hole after soaking, losing the blocking effect

Due to the existence of the above problems, the drilling accuracy is not high, which directly affects the quality of the formed contour after blasting. When encountering bad geology and water seepage holes, the charging guarantee is poor, the blocking effect is not good, and blast holes may also occur Collapsing gravel in the hole, water seepage causing gravel siltation, etc. need to re-clean the hole or even re-drill the hole many times, which will affect the progress and quality of the charge, and lead to an increase in costs