Buoyancy compensation type combined foundation and construction method

Abstract

The invention relates to a buoyancy compensation type combined foundation and construction method. The buoyancy compensation type combined foundation comprises a plurality of supporting piles, a bearing platform, a main buoyancy tank, a conversion layer and a bottom sealing layer. The bottom sealing layer is arranged at the bottom of the bearing platform. The supporting piles form pile groups, andthe top ends of the pile groups penetrate the bottom sealing layer and are connected with the bearing platform. The main buoyancy tank is arranged on the bearing platform. The conversion layer is arranged on the main buoyancy tank and used for bearing a column body so as to transmit the upper structure load to the main buoyancy tank. According to the buoyancy compensation type combined foundationand construction method, the main buoyancy tank is large in buoyancy, the vertical load effect transmitted into the supporting piles is greatly reduced, the design of the supporting piles is controlled by the section strength of the pile bodies, and the influence of a deep soft covering layer on pile foundation design is reduced. The buoyancy compensation type combined foundation has the advantages of being small in pile foundation scale, reasonable in economic index and the like. The group piles formed by the supporting piles mainly bear vertical force, the main buoyancy tank bears most of horizontal force and bending moment transmitted by the upper portion, the free pile length portion of a traditional pile foundation is replaced, the horizontal load bearing capacity of the foundation is improved, and the influence of water depth, local scouring and stormy waves on foundation stress can be reduced.

Description

Technical field[0001]The application relates to the technical field of bridge engineering, in particular to a buoyancy compensation type combined foundation and a construction method.Background technique[0002]With the rapid development of transportation construction, many super bridge projects across large rivers have emerged enthusiastically. As the most widely used foundation form in bridge engineering, pile foundation has the advantages of controllable construction risk and strong ability to adapt to geological conditions.[0003]The design of the pile foundation is determined by the vertical bearing capacity of the foundation and the strength of the pile section. In the deep and weak overburden layer, the vertical bearing capacity of the foundation is the controlling factor for the design of deep-water pile foundations. Usually, the method of increasing the number of piles and increasing the length of the pile is adopted to meet the requirements of the superstructure on the vertic...

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Problems solved by technology

[0005] The embodiment of the present application provides a buoyancy-compensated composite foundation and construction method to solve the problem of large-scale pile foundation and poor economy when building bridge pile foundations in places with deep and weak overburden layers, large local erosion, and strong wind and wave influence in related technologies. question

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