Auxiliary tube drawing device for deep hole karst grouting and construction method thereof

Abstract

The invention discloses an auxiliary tube drawing device for deep hole karst grouting and a construction method thereof. The device comprises a big drilling rod (1), an external tube (2), a steel sleeve (3) and a small drilling rod (4); the diameter of the big drilling rod (1) is larger than the diameter of the external tube (2), the diameter of the external tube (2) is larger than the diameter of the steel sleeve (3), the diameter of the steel sleeve (3) is larger than the diameter of the small drilling rod (4), the external tube (2) is shorter than the steel sleeve (3), the external tube (2) is arranged outside the steel sleeve (3), and the steel sleeve (3) is arranged under a bed rock face. The construction method comprises the steps that a drilling machine strikes the big drilling rod to be underground, after the big drilling rod is drawn out, the external tube is struck in, the steel sleeve is struck to be under the bed rock face inside the external tube by adopting the drilling machine, and the steel sleeve is left in rock; the small drilling rod is struck to be under the bed rock face or under a bottom karst cave inside the steel sleeve, after the small drilling rod is drawn out, a stop-grouting plug is arranged downwards, then grouting is conducted, after the grouting is completed, the steel sleeve is drawn out in case the steel sleeve needs to be recycled, then the next hole grouting construction is conducted, and the process is recycled.

Description

technical field [0001] The invention relates to a deep-hole karst grouting auxiliary extubation device and a construction method. Background technique [0002] At present, the grouting in the karst area usually adopts the steel casing first, and then uses the geological drill to drill the hole and the drill pipe to grout the construction. However, when the geological water level is high and the sand covering layer is thick, this method will easily cause the steel casing to be locked in the water-bearing sand layer and cannot be rotated and pulled out, resulting in the inability of the steel casing to be reused and increasing the cost. economic input. [0003] Therefore, in order to avoid the above problems, it is necessary to develop a deep-hole karst grouting auxiliary pulling device and construction method to solve the problem that the steel casing can be pulled out quickly after grouting the karst cave in the thick sandy soil cover layer. Ensure the repeated and effecti...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a deep-hole karst grouting auxiliary pulling device and construction method to overcome the steel casing in the prior art that is locked in the water-bearing sand layer and cannot be rotated and pulled out, thereby As a result, the steel casing cannot be reused, increasing the lack of economic investment

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