Method for constructing bridge deepwater foundation steel pile casing

Abstract

The invention discloses a method for constructing a bridge deepwater foundation steel pile casing, which relates to a construction scheme of a floating transportation and boat type floating platform positioning system and an air pressure raising and reducing method of the bridge deepwater foundation steel pile casing. The method comprises the following two steps of: after transporting the steel pile casing to a pier position by floating, performing precise planar positioning on the steel pile casing by an adjusted boat type floating platform positioning system; and inflating the steel pile casing by an air compressor to jack the steel pile casing. In the method, a formed steel pile casing is transported in position by floating, the steel pile casing is submerged by the air pressure raising and reducing method, and the self-weight of the steel pile casing and an anchorage system of the floating platform ensure that the verticality of the steel pile casing and a central plane position of the steel pile casing and a pile foundation can meet the precision required by design and construction. The construction method of the invention is suitable for the construction of deepwater pile foundation engineering under the conditions that river beds are inclined uncovered rocks and the like on which fixed drilling platforms cannot root, or lakes, reservoirs (comprising tidal rivers) and the like have the water depth of less than 60 meters and the common wind power of lower than 5 grade.

Description

technical field [0001] The invention relates to a bridge foundation construction method, in particular to a bridge deepwater foundation steel casing floating transportation and a ship-type floating platform positioning system + air pressure lifting method construction method. Background technique [0002] In recent years, according to the national "five vertical and seven horizontal" development plan, my country's expressway construction has entered a period of rapid development. The number of large bridges built in lakes, rivers and offshore areas has gradually increased, and the difficulty of deep-water foundation construction has gradually increased. Steel protection Tube construction is usually assembled and lowered in sections at the pile position. This construction method has the following problems: [0003] 1. The construction period is long. There are 8 steel casings with a single length of 40 meters. The steel casings need to be extended at the pile position and sink...

AI Technical Summary

Problems solved by technology

[0003] 1. The construction period is long. There are 8 steel casings with a single length of 40 meters. The steel casings need to be extended at the pile position and sink to a certain depth below the river bed. The workload of splicing on the water is heavy, and the foundation construction needs at least a dry season;

[0004] 2. The cost is high, and large-scale hoisting equipment is needed to extend the position of the pile on the water. When the construction site is a closed inner lake, the large-scale hoisting equipment cannot enter the site, and the construction risk is high;

[0005] 3. The safety and quality guarantee coefficient is low, and the steel casings are connected to the floating platform for a long time. When 8 steel casings are processed at the same time, the load on the platform is about 180t. The steel casing is lengthened by joints at the pile position, and the cumulative error of the straightness of the steel casing is difficult to control

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