Tunnel horizontal rotary jet construction method

Abstract

The invention discloses a tunnel horizontal rotary jet construction method. The tunnel horizontal rotary jet construction method comprises the steps that a borehole is drilled by using a horizontal rotary jet drilling machine, wherein the horizontal rotary jet drilling machine comprises a movable machine body, a borehole supporting frame group, a rotary jet supporting frame group, a drilling device and a rotary jet device; the drilling device is withdrawn from the borehole after drilling is completed; the rotary jet device is sent to the tail end of the borehole after a drill rod is withdrawncompletely from the borehole; and pre-prepared cement slurry is supplied to a spray head assembly of the rotary jet device by using grouting equipment; the spray head assembly is started to enable thehigh-speed sprayed cement slurry to drive soft rock around the borehole to rotate, stir and melt into a whole; as the spray head assembly withdraws from the borehole while rotary jet grouting, a reinforced pile body is formed along a first type borehole from inside to outside; horizontal rotary jet grouting is stopped after the spray head assembly completely is withdrawn from the borehole; and after all the reinforced piles are solidified and the strength of an array-shaped stability system formed by the reinforced piles is tested to meet the requirements, large-section mechanical excavationis carried out to form a tunnel.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to a construction method for advanced pre-reinforcement of weak surrounding rocks in tunnels and underground engineering. Background technique [0002] With the rapid development of railways in my country, especially mountainous railways, there are more and more mountain tunnels. Due to the limitation of the radius of the curve, railway tunnels need to pass through mountains. Various geological structural zones are widely distributed in these areas, especially weak fault zones. This kind of fault has the characteristics of deep burial, rich water, and interlayer in the weak zone. In the construction of tunnels and underground engineering in weak and broken ground, it is easy to have safety problems such as large deformation of surrounding rock and collapse of working face, slow construction progress and extremely high work efficiency. Low technical problems, and even seri...

AI Technical Summary

Problems solved by technology

But this invention still has the following shortcoming or deficiency: the grouting is carried out from the far end of the borehole to the near end of the borehole along with the withdrawal of the drill pipe, and the grouting is the injection of the horizontal mode, and its existence needs to overcome the grouting fluid due to its own gravity. Produce discontinuous or uneven defects in grouted piles

But this invention still has the following shortcoming or deficiency: the grouting is carried out from the far end of the borehole to the near end of the borehole along with the withdrawal of the drill pipe, and the grouting is the injection of the horizontal mode, and its existence needs to overcome the grouting fluid due to its own gravity. Produce discontinuous or uneven defects in grouted piles

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