Construction method of bored pile in karst geological region

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

Inactive Publication Date: 2018-05-18
CCCC THIRD HARBOR ENG
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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 p

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  • Construction method of bored pile in karst geological region

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Example Embodiment

[0020] Such as figure 1 As shown, this embodiment provides a method for constructing a bored pile in karst geology, which includes the following steps: Step S1: Drilling vertically downwards at a place to be drilled in karst geology, and determining whether there is a karst cave during drilling, If it exists, go to step S2, otherwise go to step S3; step S2: determine the position of the cave with respect to the pile foundation, if the cave is within the range set by the pile tip, first use concrete to fill the cave When the concrete is higher than the pile diameter of the cave roof and the concrete surface no longer drops, stop pouring. After the concrete reaches the set strength, continue to drill to the design pile bottom, and the final hole depth is in accordance with the cave The pile diameter below the bottom plate is not less than the set multiple. If the cave is not within the range set by the pile tip, the method of backfilling the clay and drilling the wall is adopted;...

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Abstract

The invention relates to a construction method of a bored pile in a karst geological region. The construction method comprises the steps that a hole is vertically drilled downwards in a to-be-drilledposition in the karst geological region, and whether a karst cave exists or not is judged in the drilling process, if yes, the position of the karst cave relative to a pile foundation is judged, and if the karst cave is located within a set range of a pile point, the karst cave is filled with concrete; if the karst cave is not located within the set range of the pile point, the drilled hole is backfilled with clay so as to reinforce the wall; a reinforcement cage manufactured in advance is hoisted to the proper position along the drilled hole; and a guide pipe sinks to approach the bottom of the drilled hole, and concrete is continuously injected into the reinforcement cage from the guide pipe, so that the pile foundation is formed. By adoption of the construction method of the bored pilein the karst geological region, hole collapses can be avoided in the construction process; and construction is simple, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of pile foundation construction, in particular to a construction method for karst geological bored piles. Background technique [0002] At present, karst geology is widely distributed in southern my country. Usually, the upper layer of karst geology 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 unpredictability of t...

Claims

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Application Information

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IPC IPC(8): E02D5/38E02D15/04
CPCE02D5/38E02D15/04
Inventor 叶中海胡金雄袁伟明俞鑫刘永辉张治国王丽莉
Owner CCCC THIRD HARBOR ENG
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