Two-ring grouted single pile foundation

Abstract

A two-ring grouted single pile foundation is a foundation which is made up of hard components of an internal ring and an external ring. Part areas of the internal and external rings are connected by grouting. The foundation can provide great horizontal resistance and basic stiffness, and is suitable for basic fields of wind power generation, ports, offshore platforms and the like. On the basis of a behavior of a laterally loaded pile under load and making full use of material properties of steel and concrete, two rings or steel pipes with different inner and outer diameters are adopted. The internal and external rings are successively sunk into foundation soil in various ways (excavating and placing, driving, pressing and shocking). The foundation soil of the area which is close to the ground (soil surface) between the internal and external rings is excavated and materials such as concrete are grouted. If necessary, a reinforcing body can be inserted. Thus, the two-ring grouted single pile foundation is formed. The foundation makes full use of the concrete compressive property and the steel tensile property, and compared with a large-diameter steel pipe pile can effectively reduce an outer diameter of the pile foundation and steel consumption. When in water environment such as in the sea, an environmental load on the foundation is greatly reduced and construction difficulty is correspondingly reduced. The foundation can provide great horizontal resistance and basic stiffness, and can be applied to situations of bearing great horizontal load or passive earth pressure by using the foundation and can be applied to basic designs of onshore wind power generation, offshore wind power generation, ports, and offshore oil platforms.

Description

technical field [0001] The invention proposes a single pile foundation which is composed of inner and outer double-ring hard components, and is connected by filling core in some areas between the inner and outer rings. This form of foundation can provide greater horizontal resistance and foundation stiffness, and is suitable for pile foundations to bear large horizontal loads or passive earth pressure, and is suitable for onshore wind power generation, offshore wind power generation, port terminals, and offshore oil platforms Such foundation design belongs to the field of foundation design in various industries. Background technique [0002] In engineering practice in various industries, equipment operation or environmental loads often cause large horizontal loads and require sufficient horizontal resistance and horizontal deformation stiffness in the design of engineering foundations. The moment is very large, and at the same time, the deformation and inclination of the fo...

AI Technical Summary

Problems solved by technology

The main disadvantages of this method are: ① increasing the pile diameter increases the difficulty of piling or piling, the requirements for piling hammer are higher, the construction is difficult, and there are very few domestic construction units with large-diameter piling capabilities, construction limitations ② Under marine environmental conditions, with the increase of the pile diameter, the marine environmental load (including wave force, ice pressure, water flow force and wind load, etc.) The load on the foundation is further increased; ③The horizontal bearing capacity and deformation stiffness of the pile foundation are increased solely by increasing the pile diameter or wall thickness, which leads to a sharp increase in the steel consumption of the single pile, and the engineering economy is poor

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