Rapid construction method and structure of secant pile and steel jacket box combined cofferdam

Abstract

The invention discloses a rapid construction method and structure for a secant pile and steel jacket box combined cofferdam. The method comprises the following steps of filling a small-range artificial island construction secant pile and a pile foundation in a normal water level period, excavating a foundation pit, mounting a steel jacket box, and completing the combined cofferdam in a short construction period. Compared with a traditional method, the construction period is obviously shortened, and a steel platform in the traditional construction method can be omitted; the small-range artificial island can be rapidly filled in the normal water level period, the underwater pile foundation and a trestle used in a flood season water level period can be constructed at the same time, the situation that the underwater pile foundation is constructed after the trestle and the steel platform are erected according to the traditional construction technology is avoided, the construction difficulty of constructing the trestle and the platform on a bare rock is large, and the construction period is long; according to the rapid construction method and structure of the secant pile and steel jacket box combined cofferdam, the elevation of the constructed artificial island is low, the island only needs to be constructed according to a normal water level, filling to the flood season water level elevation is not needed, the filling range of the artificial island is small, filling time is short, and construction cost is low.

Description

technical field [0001] The invention relates to the field of cofferdam construction. More specifically, the present invention relates to a fast construction method and structure of a combined cofferdam of occlusal piles and steel casings. Background technique [0002] With the continuous development of bridge foundation construction technology, bridge engineering construction is increasingly developing in the direction of deep water and long spans, and island-building cofferdam structures in complex environments continue to emerge. Rigid frame bridge is a kind of bridge structure with relatively low cost and large spanning capacity. Transferred from the pile foundation to the foundation. Therefore, the construction quality and construction speed of rigid-frame bridge caps and pile foundations have also become the key points of control in the construction of long-span rigid-frame bridges. At present, most of the extra-long-span rigid-frame bridges at home and abroad are us...

AI Technical Summary

Problems solved by technology

Due to the large difference between the flood season water level and the normal water level of the rivers in the south, the elevation of the pile cap is relatively low. To construct the pile foundation cap of the steel casing cofferdam, it is necessary to construct the supporting trestle bridge and steel platform first. The construction period is long and the construction is difficult. The construction cost is high; due to the large water level difference in the construction of the island cofferdam, if the pile foundation cap is completely used, the height and range of the island will be greatly increased, and the island construction will be difficult. Severe scouring will not only increase the cost of backfilling and the excavation of foundation pits, but also make it difficult to meet the cross-sectional water resistance requirements of rivers; most rivers in the south have high flow rates and severe riverbed scouring, resulting in less or even no riverbed cover. Therefore, the construction of steel sheet piles and steel pipe piles is particularly difficult

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