Combined construction method for short spiral soil squeezing cast-in-place pile and assembled drilling tool

Abstract

The invention discloses a combined construction method for a short spiral soil squeezing cast-in-place pile and an assembled drilling tool. The construction method adopts a construction method 1 and aconstruction method 2, and can greatly improve the construction efficiency of the short spiral soil squeezing cast-in-place pile through division of different geological conditions and application ofdifferent drilling tools; the geotechnical stratum applicability range of the short spiral soil squeezing cast-in-place pile is also expanded from the N value less than 30-35 to the N value more than30-35 of the hard and dense geotechnical stratum, the short spiral soil squeezing cast-in-place pile even can be used for the stratum with the N value above 60, and thus the geotechnical stratum application range of the short spiral soil squeezing cast-in-place in the prior art is greatly expanded. The assembled drilling tool is completely different from the integrated short spiral drill bit design structure of the prior art, according to geotechnical geological conditions and engineering requirements, a plurality of split drilling tools can be randomly assembled into an optimal type of assembled drilling tool suitable for the construction method 1 or the construction method 2, so that the larger drilling diameter, the larger drilling depth and larger bearing capacity of a single pile canbe realized.

Description

technical field [0001] The invention relates to cast-in-place pile construction, in particular to a cast-in-situ pile construction method and related construction drilling tools applied in the field of civil engineering. Background technique [0002] In the field of civil engineering, modern concrete pouring piles are divided into long auger drilling piles using long auger drilling tools and short auger extruding soil grouting piles using short auger drilling tools according to different forms of construction drilling tools. pile. The construction drilling tools and construction methods used by these two kinds of cast-in-situ piles are completely different, and the pile-forming effects produced are also very different. Among them, the long spiral bored pile will discharge all the soil in the pile hole to the surface during the construction process; while the short spiral squeezed soil pile can squeeze all or most of the soil in the pile hole to the pile hole in the surroun...

AI Technical Summary

Problems solved by technology

[0004] (1) Adopting an integrated drilling tool: it will cause one drilling tool to deal with a variety of different stratum conditions, which is often unsuitable for the construction of short spiral squeezed soil grouting piles; the remedial method usually requires a large number of backup drills of different types This forces the design standards and performance requirements of drilling tools to be improved, the cost of integrated drilling tools is increased, and the construction cost is increased. At the same time, the application range of formations is greatly limited.

In addition, the construction site of each project often needs to be equipped with at least two sets of similar drilling tools to ensure the construction period, which will also greatly increase the equipment cost of the construction party

[0005] (2) Adopting a single construction method: ignoring the differences in stratum conditions, applying the same construction method with an integrated drilling tool, although it can cope with the construction of short spiral soil-extruded cast-in-place piles in soft plastic, slightly dense or medium dense strata; However, when faced with dense sandy soil, hard clay or fully weathered rock formation, it is often impossible to complete the drilling operation of short spiral squeezed piles

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