Construction technology of one-way spiral half-squeeze soil drill bit and one-way spiral half-squeeze pile

Abstract

The invention provides a one-way spiral half soil compaction drill bit which comprises a hollow connecting rod. One end of the connecting rod is provided with a flange plate and a drill tip is arranged close to the other end of the connecting rod. The hollow connecting rod is sequentially and coaxially sleeved with a lower spiral compaction expanding body, a non-closed compaction expanding body and an upper soil conveying auger stem from the end close to the drill tip to the end provided with the flange plate. The drill tip is connected to the end of the lower spiral compaction expanding body, spiral compaction expanding blades are arranged on the outer wall of the lower spiral compaction expanding body, upper spiral soil conveying blades with the spiral direction identical to that of the spiral compaction expanding blades are arranged on the outer wall of the upper soil conveying auger stem, the outer diameter of each compaction expanding blade is identical to that of each upper spiral soil conveying blade and is D1, the maximum outer diameter of the non-closed compaction expanding body is D2, the maximum outer diameter of the lower spiral compaction expanding body is D3, and an inequation D3<D2<D1 is satisfied. According to a one-way spiral half soil compaction pile construction technology and the one-way spiral half soil compaction drill bit applied to the technology, foundation piles which are high in bearing capacity, low in cost, green and environmentally friendly can be constructed, the drill bit and the technology are suitable for various complex stratums including a hard rock stratum, and the phenomena of the compaction negative effect, pile body lateral displacement and the like are effectively reduced.

Description

technical field [0001] The invention relates to a unidirectional spiral semi-squeeze soil drill bit used in the field of pile foundation engineering and a construction technology of a unidirectional spiral semi-squeeze soil pile constructed by using the drill bit. Background technique [0002] In the field of modern pile foundation engineering, pile foundation technology is divided into three categories according to the impact of pile formation on the stratum: soil-discharging piles, semi-compacted soil piles and full-compacted soil piles. In the current pile foundation market, dump piles occupy most of the market share, and a small part of the market share is occupied by fully squeezed soil piles. With the large-scale development of urbanization, technical defects and environmental pollution problems of piles such as bored piles, punched piles, rotary excavation piles, and CFA piles have become increasingly prominent. For the fully squeezed soil piles that can overcome the...

AI Technical Summary

Problems solved by technology

For the fully squeezed soil piles that can overcome the environmental pollution of the dump piles, such as static pressure pipe piles, driven square piles, and fully squeezed soil-type spiral squeezed piles, etc., face new technical difficulties in pile foundation construction, such as construction When encountering hard rock and soil strata, the foundation pile cannot be pressed, driven or drilled into the designed stratum, and the designed pile length cannot be guaranteed. In addition, it may also bring unavoidable negative effects of soil squeezing, resulting in ground uplift and cracking Technical issues such as lateral displacement of the pile body

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