Deepwater pile foundation steel casing construction method suitable for bare rock geological conditions

Abstract

The invention discloses a deepwater pile foundation steel casing construction method suitable for bare rock geological conditions. The method comprises the steps that a construction trestle and a drilling platform are erected; a riverbed foundation is explored and flattened; an outer sleeve water blocking steel casing is lowered and positioned; a rotary drilling rig is matched with a cutter barreldrill bit to conduct grooving on bed rock; a construction casing is embedded into an annular groove position; yellow clay or underwater concrete is lowered through a guide pipe to fill a gap betweenthe construction casing and the bare rock groove position; the outer sleeve steel casing is pulled out; the outer sleeve steel casing and the equipment are moved to the next hole site, and casing construction of other hole sites is completed in a circulating mode in sequence. According to the construction method, pile foundation steel casing construction under the difficult construction conditionsof bare rock, deep water and the like can be rapidly completed, the pile foundation construction casing can accurately extend into the stable bed rock, the pile foundation construction quality is effectively guaranteed, the construction process is safe and reliable, the construction period is short, and economic benefits are good.

Description

technical field [0001] The invention relates to the field of bridge pile foundation engineering, in particular to a construction method for steel casings of deepwater pile foundations suitable for bare rock geological conditions. Background technique [0002] In the field of bridge pile foundation engineering, bridge structures are commonly used to span rivers and rivers. The construction of bridge pile foundations on rivers is common in various projects. According to different geological conditions and hydrological conditions, the difficulty of pile foundation construction in water The degree varies greatly, and it is even more difficult to accurately locate and implant the casing in bare rock geology under deep water conditions; because the river bed cover is shallow and the bedrock of the river bed is directly exposed, the steel casing of the pile foundation cannot be used for vibratory hammer or pile driving The machine is directly lowered into place. [0003] At presen...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the difficulties and slow progress of pile foundation steel casing construction under bare rock geological conditions, and the bottom opening of the casing is easy to leak grout or even collapse during the later pile foundation construction process, which causes relatively large quality hidden dangers to pile foundation construction; Provides a construction method suitable for deepwater pile foundation steel casings under bare rock geological conditions; this method has high installation accuracy, stable hole openings, and fast construction speed, which improves the construction quality of pile foundations under complex conditions, improves construction efficiency and ensures construction Safety

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