Pile foundation construction method for easily-collapsed thick covering layer opening karst cave geology

Abstract

The invention relates to a pile foundation construction method for easily-collapsed thick covering layer opening karst cave geology, and relates to the field of pile foundation construction. The pilefoundation construction method comprises the steps that firstly, a karst cave is subjected to mud jacking reinforcement, a bored pile casing is buried in each pile position, holes are led to a first preset position below a bed rock surface, and when a first section of protective steel casing is lowered to a second preset position along the bored pile casings, the first section of protective steelcasing is fixed to the bored pile casings; and finally, the protective steel casing to be installed is connected with the previous section of installed protective steel casing, after installation is finished, the previous section of protective steel casing is separated from the bored pile casings, the section of protective steel casing is lowered, when the section of protective steel casing is lowered to the second preset position, the section of protective steel casing is connected with the bored pile casings, and circulation is conducted in sequence until the first section of protective steel casing is lowered into a rock stratum. The pile foundation construction method provided by the invention solves the problems that ground surface collapse, drill bit burying, steel casing sinking andthe like are easily caused by pile foundation construction in a karst cave geological environment of an easily-collapsed thick covering layer.

Description

technical field [0001] The present application relates to the field of pile foundation construction, in particular to a pile foundation construction method for open karst cave geology in a thick overburden that is easy to collapse. Background technique [0002] At present, pile foundation construction refers to the construction process of building foundations. Pile foundations are composed of piles and pile caps. The construction methods of piles can be divided into two categories: prefabricated piles and cast-in-situ piles. , in addition to considering the type, section, length, site environment and design requirements of the pile, engineering geological conditions also need to be considered. [0003] During pile foundation construction, karst geological environment is often encountered. In conventional karst area projects, karst caves are generally deeply buried, with thicker rock layers on the upper part, and the covering layer is mostly clay. When drilling into karst cav...

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Problems solved by technology

[0004] The embodiment of the present application provides a pile foundation construction method for open karst cave geology with a thick overburden that is easy to collapse, so as to solve the problem of sand layer, ground surface, etc. Problems of subsidence, buried drill bit, sinking of steel casing, etc.

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