Steel pipe composite pile foundation applicable to deep water and coral reef geology

Abstract

The invention discloses a steel pipe composite pile foundation applicable to deep water and coral reef geology. The steel pipe composite pile foundation comprises a bearing platform and pile foundations for supporting the bearing platform. Each pile foundation comprises a reinforced concrete pile body and a steel pile casing enclosing the outside of the reinforced concrete pile body, wherein the steel pile casing and the upper end of the reinforced concrete pile body are embedded into the bearing platform. The part, embedded into the bearing platform, of each steel pile casing comprises a ring-shaped steel ring and steel planks which are uniformly arranged on the ring-shaped steel ring in a surrounding manner. An included angle between each steel plank and the cross section of the corresponding reinforced concrete pile body ranges from 90 degrees to 110 degrees, and the gap between every two adjacent steel planks is 0.8-1.2 times the width of the steel planks. According to the steel pipe composite pile foundation, the bearing ability of the pile foundations is improved, particularly, the horizontal bearing capacity of the pile foundations can be increased, the number of adopted reinforcing steel bars for pile foundation reinforcement cages can be reduced, and the foundation construction risk and the manufacturing cost are reduced greatly.

Description

technical field [0001] The invention relates to the field of bridge design. More specifically, the invention relates to a steel pipe composite pile foundation suitable for geological conditions of deep water and coral reefs. Background technique [0002] Under the background of the country's "Belt and Road" strategy, the island-connecting bridge project will become an important opportunity for countries along the Maritime Silk Road to drive economic development. However, building bridges in such countries and regions will face difficulties that domestic bridge construction has never faced. Outer sea islands and reefs generally have the following characteristics in the environment of bridge construction, deep water (greater than 50m), long-period swell (greater than 14s), and coral reef geology, which pose difficulties for bridge foundation design. [0003] Deep water means that the free height of the foundation in the water is large, and the rigidity and strength of the fo...

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Problems solved by technology

[0005] At present, there is no precedent for bridge engineering using pile foundations under coral reef geological conditions, especially in deep water and coral reef geological conditions. If steel pipe piles are used, the side friction resistance is small under coral reef geological conditions, and it is difficult to meet the bearing capacity requirements.

If the bored pile foundation is used, the self-weight of some pile foundations in the water will greatly increase the load-bearing requirements of the foundation, and the efficiency is very low

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