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Construction method of cast-in-place pile passing through karst cave

A construction method and cast-in-place pile technology, which are applied in sheet pile walls, infrastructure engineering, construction, etc., can solve the problems of easy collapse of the cave roof, difficult pouring of concrete, and difficulty in foundation construction, so as to prevent cave collapse and enhance construction adaptability. , cost-effective effect

Active Publication Date: 2019-04-16
HUBEI UNIV OF TECH
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  • Claims
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Problems solved by technology

[0003] In order to solve the problem that the concrete of the pile body penetrating the karst cave is not easy to be poured, the construction of the pile foundation penetrating the karst cave is difficult and the cost is high, and the problem that the roof of the karst cave is easy to collapse after construction is solved, and a cast-in-place pile penetrating the karst cave is provided. construction method, while protecting the original ecological and geological environment of the cave as much as possible

Method used

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  • Construction method of cast-in-place pile passing through karst cave
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  • Construction method of cast-in-place pile passing through karst cave

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Embodiment Construction

[0037] The mode and implementation steps of the present invention will be further described below in conjunction with the accompanying drawings.

[0038] Such as Figure 7 and Figure 8 As shown, a pile foundation construction enclosure structure includes a plurality of steel wire meshes and a super-strong geotextile 2.2, and the multi-piece steel wire meshes are sequentially hinged end to end to form an expandable enclosure device 2, and the super-strong geotextile 2.2 Cover the expandable containment device 2 to provide binding force for the expandable containment device 2 and prevent pouring concrete from leaking out. The steel wire mesh is low-carbon steel wire mesh 2.1, which has high strength , high corrosion resistance, high rigidity, and a certain self-stabilization ability to ensure that it will not fall like the inside; low-carbon steel wire mesh 2.1 is covered with super-strong geotextile 2.2 outside, which can ensure the enclosure capacity of the steel wire mesh ...

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Abstract

The invention discloses a construction method of a cast-in-place pile passing through a karst cave. Firstly, the existing technology is used in drilling a hole on an upper covering layer of the karstcave, and then the expandable enclosure device is lowered into the karst cave by hoisting equipment. When the expandable enclosure device is lowered to the middle position of the karst cave, the expandable enclosure device is opened by inflating the air bag. Expanding materials are filled into the top and the bottom of the expandable enclosure device, so that the gap between the expandable enclosure device and the top and the bottom of the karst cave is filled up. After that, the air bag is recovered, and the pile hole drilling construction is carried out on the rock stratum at the bottom of the karst cave until the drilling depth reaches the designed depth of the pile body. The hole forming quality of the pile hole is detected, and the next step is carried out when the detection is qualified. The reinforcement cage is put down, and the concrete is poured into the pile body by the guide pipe. After the pile body is solidified, the construction of the cast-in-place pile is finished. Theconstruction method has the advantages of simple construction process, low cost, improved bearing capacity, small disturbance to the geological environment of the karst cave and the like.

Description

technical field [0001] The invention belongs to the technical field of pile foundation construction in civil engineering, and in particular relates to a construction method of cast-in-situ piles passing through karst caves, which solves the problem that concrete is not easy to pour when piles penetrate large karst caves. Background technique [0002] my country's karst areas are vast, and karst geological conditions are often encountered during engineering construction, and karst caves have caused great troubles to the progress of the project. The most commonly used foundation form in karst areas is the pile foundation. When the thickness of the upper covering layer (roof) of the karst cave does not meet the bearing capacity requirements, the pile body needs to penetrate the karst cave to meet the bearing capacity requirements of the pile foundation. The traditional construction method needs to fill the karst cave, or lower the steel casing in the karst cave to protect the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/38E02D5/66
CPCE02D5/38E02D5/665
Inventor 刘永莉郭斌肖衡林马强王克兵杨智勇陈智杨亚宁刘一鸣胡其志
Owner HUBEI UNIV OF TECH
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