Construction method of karst stratum pile foundation

A construction method and stratum technology, applied in foundation structure engineering, sheet pile walls, buildings, etc., can solve the problems of high cost and long construction period, and achieve the effects of simple construction, shortened construction period and avoiding hole collapse

Inactive Publication Date: 2018-05-29
CCCC THIRD HARBOR ENG
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  • Abstract
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Problems solved by technology

[0005] For this reason, the technical problem to be solved by the present invention is to overcome the problems of long construction period and high cost in the pil

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  • Construction method of karst stratum pile foundation

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Embodiment Construction

[0020] Such as figure 1 As shown, the present embodiment provides a construction method for pile foundations in karst strata, which includes the following steps: Step S1: Drill vertically downward at the place to be drilled on the karst stratum, and determine whether there is a karst cave when drilling. exists, then enter step S2, otherwise enter step S3; step S2: judge the height of the karst cave, if the height of the karst cave is less than the set height, first use concrete to fill the karst cave until the concrete is higher than the set height When the height of the pile diameter of the roof of the karst cave and the concrete surface no longer drops, stop pouring, and continue drilling into the hole to the bottom of the designed pile after the concrete reaches the set strength; if the height of the karst cave is greater than the set height, use a steel casing The follow-up method; step S3: hoisting the pre-fabricated reinforcement cage into place along the borehole; step ...

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Abstract

The invention relates to a construction method of a karst stratum pile foundation. A place to be drilled on a karst stratum is downwards and vertically drilled; existence of a karst cave is judged during drilling; if so, the height of the karst cave is continuously judged; when the height of the karst cave is lower than a set height, concrete is adopted to fill the karst cave; if the height of thekarst cave is higher than the set height, a steel protecting cylinder followup method is adopted; a reinforcement cage manufactured beforehand is lifted in place along a drilled hole; a guide pipe issunk to approach the bottom of the drilled hole; concrete is continuously injected from the guide pipe into the reinforcement cage to form a pile foundation. The construction method of the karst stratum pile foundation can prevent the hole collapse phenomenon in the construction process, and is simple in construction and low in cost.

Description

technical field [0001] The invention relates to the technical field of pile foundation construction, in particular to a construction method for pile foundations in karst formations. Background technique [0002] At present, karst formations are widely distributed in southern my country. Usually, the upper layer of karst formations is silty clay, and the base layer is weakly weathered limestone layer. There are many erosive arched caves, which are usually called karst caves. Karst caves are underground dissolution phenomena formed by surface water and groundwater through chemical and mechanical damage to soluble rock formations. This geological site will affect the stability and mechanical distribution of surrounding rocks. [0003] In the process of pile foundation construction, because the excavation of the pile foundation is an underground concealed project, it is sometimes unavoidable to encounter karst caves. Due to the complexity of the karst cave stratum and the unpred...

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Application Information

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IPC IPC(8): E02D27/12E02D5/38E02D15/04
CPCE02D27/12E02D5/38E02D15/04
Inventor 叶中海胡金雄程剑春刘永辉陈磊胡华清王丽莉
Owner CCCC THIRD HARBOR ENG
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