Rotary excavating and drilling construction method relating to deep concrete blocks and gravel layer and special rotary excavating and drilling equipment

Abstract

The invention relates to a rotary drilling construction method relating to deep concrete blocks and a gravel layer. According to the construction method, firstly, preparation for construction is made,preparation for drilling is made, and when drilling is performed to backfill concrete blocks in a deep layer and the gravel layer, a sand fishing drill bit is replaced with a spiral drill bit to stirand loosen gravels with larger particle sizes and break the concrete blocks with larger sizes; then the spiral drill bit is replaced with a cutting pick hard rock coring drill bit to advance in the gravel layer, and then through pressurizing by a drilling machine, broken stones and gravels compacted on the side wall of a drilled hole are completely taken out of the drilled hole; and finally the cutting pick hard rock coring drill bit is replaced with the sand fishing drill bit for continuously drilling to finally achieve hole forming. The invention further provides special rotary excavating and drilling equipment relating to the deep concrete blocks and the gravel layer. The special rotary excavating and drilling equipment comprises a rotary drilling rig, a main winch, a power head, a drill rod and drill bits, and the drill bits include a rock spiral cone drill bit, the cutting pick hard rock coring drill bit and the sand fishing drill bit. The different drill bits are replaced according to geological requirements, and drilling construction of a complex stratum structure is smoothly conducted.

Description

technical field [0001] The invention relates to a rotary drilling and drilling construction technology for cast-in-situ pile construction, in particular to a rotary drilling and drilling construction method involving deep backfilling of concrete blocks and gravel layers. Background technique [0002] The traditional dry-work hole-forming cast-in-place pile construction is to excavate the cast-in-place pile construction holes in the cohesive soil layer, sandy soil layer, silty clay layer or miscellaneous filling soil and weathered rock layer above the groundwater level. Two kinds of hole-digging modes are arranged in the prior art, and a kind of is mechanical drilling (bottom expansion) cast-in-place pile, and another kind is manually dug hole cast-in-place pile. Manually digging holes is likely to cause casualties during the construction process, and the construction risk factor is relatively high. The rotary drilling rig is convenient in construction, high in safety, and h...

AI Technical Summary

Problems solved by technology

The grading coefficient within the excavation area of ​​this treatment method is relatively large, the backfill layer cannot achieve the original soil layer compaction effect, the stability of the soil cannot be guaranteed, and the foundation safety disturbance is caused to adjacent buildings; treatment method 2: use impact formation Although the impact hole can penetrate the stratum structures such as boulders, weathered rocks and old foundations, the noise generated by the impact hammer and the disturbance to the soil are relatively high, so it is not suitable for urban areas and industrial buildings.

It is necessary to configure mud during construction to prevent hole collapse and wire rope shaking, and the construction safety factor is low

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