Enclosing type deepwater platform construction method based on condition of sand backfilling balance method

Abstract

The invention discloses an enclosing type deepwater platform construction method base on the condition of a sand backfilling balance method. The enclosing type deepwater platform construction method is characterized in that firstly, cofferdams of construction steel sheet piles are formed on the river bed surface, back covering concrete layers are formed in the cofferdams through underwater pouring, and sandy soil of which the height is greater than that of the back covering concrete layers of the outer sides of the cofferdams is sucked to the interior of the steel sheet cofferdams through dredging tubes so that height difference of sandy soil of the inner side of the steel sheet cofferdams and the outer side of the steel sheet cofferdams is reduced; water is extracted gradually in the steel sheet cofferdams and inner supports are installed sequentially, and temporarily stored sandy soil is hoisted out of the cofferdams so that surface layers of the back covering concrete layers are exposed; platform templates are arranged on the back covering concrete layers, and a platform template supporting system is formed by installing I-shaped steel between the steel sheet piles and the platform templates; and first layer platform concrete, concrete top beams and second layer platform concrete are poured in the platform templates in sequence, and sandy soil is backfilled between the steel sheet piles and the platform templates at the same time and the construction of platform concrete is completed. According to the enclosing type deepwater platform construction method, cofferdam platform is easy to construct on abrupt slope or deepwater sandy riverbed.

Description

technical field [0001] The invention relates to civil engineering construction, in particular to a construction method for a deep-water cap. Background technique [0002] At present, when steel sheet pile cofferdams are constructed on sandy deep-water riverbeds, the construction of the cofferdams, such as implantation, soil sinking, fixing, and bottom sealing, is already quite difficult. When the riverbed slope is large and the size of the cofferdam is limited Construction is very difficult. Therefore, steel cofferdams with doubled rigidity are usually installed in engineering design or places where unfavorable geological, topographical and hydrological conditions coexist, such as deep water, steep slopes, and rocky riverbeds, are usually avoided as far as possible. However, due to the constraints of bridge line position, bridge type, span, cost and other factors, the above situation is sometimes unavoidable, that is, sometimes it is unavoidable to set up cofferdams in deep...

AI Technical Summary

Problems solved by technology

However, due to the constraints of bridge line position, bridge type, span, cost and other factors, the above situation is sometimes unavoidable, that is, sometimes it is unavoidable to set up cofferdams in deep-water sand layers

And there is no reliable and effective construction method in the prior art that can carry out construction under this condition

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