A kind of super-deep and large-diameter bored pile hole forming method

Abstract

The invention relates to a method for forming a hole for an ultra-deep and large-diameter bored pile. Steel casing; the fourth step, the drilling rig is in place; the fifth step, the mud circulation system is arranged and the mud is prepared; the sixth step, the opening; the seventh step, the first-level reaming; the eighth step, the second-level reaming ; The ninth step, three-stage reaming; the tenth step, the hole detection. The invention can complete the hole forming of the large-diameter and ultra-deep bored piles without the special drilling machine for the ultra-deep and large-diameter bored piles, and has high hole-forming precision and short hole period, which can ensure safety and reduce costs.

Description

technical field [0001] The invention relates to bridge engineering, in particular to a method for forming a hole for an ultra-deep and large-diameter bored pile. Background technique [0002] The design and construction level of large-diameter bored piles for bridges in my country are in the forefront of the world. For large bridge projects, bored piles are generally used as the preferred foundation form. At present, the largest recorded diameter of bored piles in China is Wuhan Tianxingzhou Bridge. The piles are 76m long and 3.4m in diameter. They are rock-socketed piles. The maximum pile length of a single pile is the North Channel Bridge of the Hangzhou Bay Cross-sea Bridge, whose pile length has exceeded 125m and the pile diameter is 2.8m, which is a friction pile. At present, only the KTY-3000 gas lift reverse circulation drilling rig of China Railway Bridge Bureau can be drilled into place at one time, and the conventional single drilling equipment and construction m...

AI Technical Summary

Problems solved by technology

[0003] CN 104047543A discloses "a construction method for forming holes with large-diameter bored piles in high-strength rock formations". By adopting multiple coring methods and using drill bits of different diameters, multiple cores are taken from high-strength rock formations , and finally completed the drilling of the bored pile embedded in the rock, which effectively solved the problems of low construction efficiency and large vibration interference in the existing technology, improved the quality of the hole, reduced the construction risk, etc., and has the advantages of fast construction speed and environmental protection The characteristics of small impact and high economic benefit

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