Large deep foundation protection lock catch steel pipe pile cofferdam structure and construction method thereof

Abstract

The invention belongs to the related technical field of bridge construction, and discloses a large deep foundation protection lock catch steel pipe pile cofferdam structure. The large deep foundation protection lock catch steel pipe pile cofferdam structure is formed by connecting a plurality of lock catch steel pipe piles end to end in series and is further provided with enclosing purlins, inner supports and bearing pile columns, wherein each lock catch steel pipe pile is a CO type steel pipe pile, the enclosing purlins are arranged on the inner side wall of a steel pipe pile cofferdam in a layered mode, and the inner supports and inclined supports are used for erecting main engineering structures such as a pouring platform; in addition, the bearing pile columns are arranged at intervals in the horizontal transverse direction and the horizontal longitudinal direction of the steel pipe pile cofferdam. The invention further discloses a corresponding construction process method. According to the large deep foundation protection lock catch steel pipe pile cofferdam structure, safety maintenance of a foundation pit under the deep burying condition can be smoothly executed, accurate, rapid and safe installation of the cofferdam is achieved, and meanwhile the problems that the flexibility of a platform is large, and the number of arranged force bearing components is too large under the super-large-span condition are effectively solved; in addition, the large deep foundation protection lock catch steel pipe pile cofferdam structure has the advantages that the construction efficiency is high, the water stopping effect of the cofferdam can be remarkably improved, and rapid construction and dismantling are facilitated.

Description

technical field [0001] The invention belongs to the technical field related to bridge construction, and more specifically relates to a large deep foundation protective locking steel pipe pile cofferdam structure and a construction method thereof. Background technique [0002] As a common temporary protective structure, cofferdam can effectively avoid the risk of structural instability and water inrush after foundation pit excavation, and is often used in bridges, buildings and other engineering construction fields. At present, the common forms of cofferdam mainly include: earth-rock cofferdam, double-wall steel casing cofferdam, steel sheet pile cofferdam, steel pipe pile cofferdam, reinforced concrete caisson, etc. [0003] The tidal flat area in the bay has the characteristics of rich groundwater, obvious tidal fluctuations, and is often submerged by seawater during high tides. Therefore, it is necessary to select an appropriate cofferdam form according to project characte...

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Problems solved by technology

[0004] However, further studies have shown that the above-mentioned prior art still has the following deficiencies or defects: First, the bridge main tower cap is located in the tidal flat area of ​​the bay during the construction process, and it is buried deep and has a large cross-sectional size, which is a typical water-rich structure. The large-scale deep foundation structure in the area has extremely high safety risks. Accordingly, it is necessary to further solve the problem of foundation pit protection under deep buried conditions, especially the problem of optimizing the internal support structure and requiring more load-bearing components in the case of super-large spans; second, Due to the complex geological structure and natural conditions of the area, it is very susceptible to the impact of quicksand sliding and sea tide erosion. In addition, as the buried depth increases, the water pressure in the lower part is extremely high. The lower the foundation pit protection structure is, the more difficult it is to waterproof and seal it. It is urgent to further improve the water-tight performance of the cofferdam; thirdly, in view of the long construction period of the main structures such as caps and piers, in order to avoid the impact on the navigation of ships to the greatest extent, choose a convenient, fast and safe operation Cofferdam forms that are economical, can be constructed and disassembled quickly are particularly important

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