Safety Compensation Facilities and Construction Method for Circumferential Rigidity of Cast-in-situ Bored Pile Casing in Deep Water

Abstract

The invention relates to a circular rigidity safety compensation facility for a pile casing of a deep water bored pile and a construction method thereof. The compensation facility comprises a pile casing of a deep water bored pile for surrounding the deep water bored pile and a circular rigidity compensation mechanism of the pile casing arranged on the inner wall of the pile casing of the deep water bored pile; the circular rigidity compensation mechanism of the pile casing comprises a plurality of rigid tracks vertically arranged on the inner wall of the pile casing of the deep water bored pile, a circular lining rigid gasket structure of the pile casing arranged on the rigid tracks and located in a circular direction of the pile casing of the deep water bored pile and a lifting device connected with the circular lining rigid gasket structure of the pile casing; the lifting device is arranged on the top or outer side of the pile casing of the deep water bored pile. The technical scheme provided by the invention can prevent drilling instable accidents caused by the coupling of the deep water and poor geological conditions so as to ensure the construction safety of deep water pile foundation.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a safety compensation facility for circumferential stiffness of a deep-water bored cast-in-place pile casing and a construction method thereof. Background technique [0002] Hubei is the province with the most reservoirs in the country, with 6,275 reservoirs, including extra-large reservoirs such as the Three Gorges Reservoir and Danjiangkou Reservoir, 8 large (one) type reservoirs, 61 large (two) type reservoirs, and 280 medium-sized reservoirs; the capacity of the reservoir area Accounting for 12.% of the national total. The development of the national economic construction of the reservoir has made a huge contribution. With the development of the national economic construction, more and more bridges are built in the reservoir area. Deep water and complex geological conditions are the biggest hidden dangers of bridge pile foundation construction. The foundation eng...

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Problems solved by technology

[0003] With the improvement of our country's bridge construction capacity, more and more large and complex bridges are being built. The pile foundation of the bridge is an important part of the bridge. The foundation engineering of the bridge construction of large rivers and large rivers is an important key project, which is often carried out under complex hydrogeological conditions. Coupled with its long construction period, complex structure, high technical difficulty, and a large number of uncertain construction risks during the construction of large bridges, especially the construction safety of deep-water pile foundations, there are great hidden dangers

[0004] Due to the complexity of geological conditions in the construction of deep-water bored piles, if they encounter sand and pebble layers or other adverse geological conditions during the drilling construction process, the water head in the casing may suddenly drop, and the major safety hazards will be as follows : Under normal circumstances, it may cause safety risks such as collapsed holes and buried drilling; under the coupling effect of deep-water foundation construction and adverse geological conditions, it may cause the casing to become unstable or even collapse, resulting in major safety accidents

For example, in the construction of the deep-water pile foundation of the Tongzhuang River Bridge in the Three Gorges Reservoir area of ​​Zigui County, the water depth is more than 80 meters. When the borehole passes through the unfavorable geological layer, the mud in the casing suddenly loses a large amount of water, and the strong circumferential water pressure in the deep water Under the action, the casing under construction was severely squeezed, which almost caused a safety accident of instability and collapse

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