Karst-area underwater bridge pier drilled pile construction method

Abstract

The invention discloses a karst-area underwater bridge pier drilled pile construction method. The construction drilled pile passes through one or more karst caves from top to bottom according to the following steps that (1) measuring staking-out is conducted; (2) a steel protection barrel is put downwards and fixed; (3) drilling is carried out, namely, the steel protection barrel is put downwards and drilled from top to bottom through a percussion drill until the designed depth is reached, a slurry breast wall is adopted in the drilling process, when the drilled pile is drilled to enter the karst caves needing passing from top to bottom in the drilling process, an energy transfer method is firstly adopted to process the karst caves needing passing under the current state, then downward drilling is continuously carried out through the percussion drill; (4) a steel reinforcement cage is put downwards and concrete pouring is conducted. The karst-area underwater bridge pier drilled pile construction method is simple in step, reasonable in design, low in input cost, convenient to achieve, good in construction effect and capable of simply, conveniently and fast finishing the karst-area drilled pile construction process at a low cost in a high-quality mode.

Description

technical field [0001] The invention relates to a construction method of bored piles, in particular to a construction method of bored piles for bridge water piers in karst areas. Background technique [0002] At present, there are four construction methods for bored piles in karst areas: mud wall construction method, static pressure chemical grouting method, casing follow-up method and energy transfer method. Among them, the mud wall method is mainly suitable for small caves not larger than the pile diameter, and the specific conditions are determined according to the relative position of the cave, the type of surrounding rock and the nature of the filling. The grouting materials used in the static pressure chemical grouting method are ordinary Portland 425 cement, water glass, calcium chloride, sodium aluminate, etc. The casing follow-up method is suitable for karst caves with large groundwater flow, multi-layer karst caves, large karst caves and silt-sand karst. The stee...

AI Technical Summary

Problems solved by technology

The static pressure chemical grouting method is also not applicable. Although the extra-large karst caves are filled with wet plastic and flow plastic fillings, the effect of this method is better, but because the karst caves are too large and the number is too large, the total amount of grouting cannot be estimated

In summary, although the above two construction methods of bored piles are simple, convenient, safe and easy to control, the economic benefits of input and output are not proportional

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