Non-excavation in-situ replacement filling spiral drilling method of unconsolidated stratum

Abstract

The invention discloses a non-excavation in-situ replacement filling spiral drilling method of an unconsolidated stratum. According to the method, an annular space formed at the collapse part of the unconsolidated stratum is utilized to achieve replacement of targeted rock and soil, the most rock and soil are replaced at the most unconsolidated part of the stratum, then a drill bit is tripped in and rotates positively and negatively for pressing and compacting, most clay is extruded in and compacted at the most unconsolidated stratum section, and a formed wall protecting layer is thicker. According to the non-excavation in-situ replacement filling spiral drilling method of the unconsolidated stratum, in the process of pressing, extruding and expanding of the drill bit, a backfill clay layer is extruded tightly and compacted, and meanwhile, an undisturbed soil layer around a drilled hole is extruded tightly and compacted, so that the whole stability of the drilled hole after being processed in this way is improved greatly, and safe, efficient and stable propelling of subsequent processes is ensured effectively. Clayey soil in a put-in hole can use the clay drilled out by other drilled holes or materials are taken at the nearest position. According to the non-excavation in-situ replacement filling spiral drilling method of the unconsolidated stratum, the extra cost is not additionally increased in the process of solving collapse holes, based on the use of original equipment, even clay backfill can also be drilling slag of the other drilled holes, and the cost is saved.

Description

technical field [0001] The invention relates to an auger drilling method for non-excavation in-situ replacement and filling of loose formations. Background technique [0002] In the drilling technology of stable non-aqueous Quaternary strata, the construction technology of dry hole long helical drilling reinforced concrete piles has the advantages of simple pouring process, equipment investment, less labor, fast pile formation speed, high pile formation quality and less accidents. It has the advantages of low efficiency, less pollution on the construction site, and obvious comprehensive benefits. Therefore, the construction technology of dry hole-forming long auger drilling can be widely used. However, the use of auger drilling rigs in dry, loose and weak formations can easily cause hole collapse accidents. [0003] 1. Conventional drilling schemes and their shortcomings to overcome hole collapse accidents in dry and loose formations [0004] Conventional drilling schemes...

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is to provide a non-excavation in-situ refill auger drilling method in loose stratum, which can effectively solve the problem of hole collapse when the auger drilling machine drills into the loose and weak stratum to form holes , it does not add extra cost in the process of solving the collapsed hole, based on the use of the original equipment, even the backfill clay can also be the drilling slag of other holes, saving costs

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