Steel cavity stranded caisson-pile inverse-way composite base and construction method

Abstract

The invention relates to a composite foundation composed of a caisson with a steel cavity and piles constructed by the reverse operation method, and a construction method thereof, belonging to the bridge construction technology. The composite foundation comprises a caisson, a foundation bed, and piles. The caisson is composed of a steel cavity, an outer wall, an inner wall with a partition wall structure, a caisson cover, and a caisson bottom platform, wherein the caisson cover is preserved with water pumping and gas delivery holes, which are doubled as inspection holes. The caisson is arranged above the foundation bed and placed inside water, bridge piers are arranged on the caisson cover, the periphery of the caisson bottom platform is connected with the piles constructed by the reverse operation method, and the piles are inserted into the foundation bed and the sea bed or river bed through sinking pile preserved holes. After a foundation trench is excavated, a ship is located by riprapping to form the foundation bed, and the foundation bed is leveled by a platform type foundation bed riprapping leveling ship. The piles are connected with the caisson by pouring concrete in the preserved holes in the caisson. The inventive composite foundation utilizes the buoyancy force of the caisson steel cavity and considers the combined action of the piles, soil and the caisson to share partial external load by the sea bed or the river bed. The composite foundation optimizes the pile foundation design, reduces settlement during bridge service period, and reduces construction cost.

Description

technical field

[0001] The invention relates to the technical field of bridge construction, and relates to a construction method using the buoyancy of a steel cavity caisson, in particular to a steel cavity caisson-pile reverse method composite foundation and a construction method. Background technique

[0002] In the prior art, the foundation forms currently adopted by deep water foundations of bridges at home and abroad mainly include:

[0003] (1) Setting the foundation: The foundation is prefabricated as a whole, and the foundation is placed on the leveled sea (river, river) bed rock surface by means of floating or floating crane hoisting, which is called setting the foundation. This method was used to construct the foundations of the South and North Bisan Bridges in Japan, the foundation of the main tower of the Akashi Kaikyo Bridge, and the foundation of the No. 3 pier of the Salazar Bridge in Portugal. The processing and manufacturing of the main structure of the fou...

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