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Offshore wind power variable-diameter screw pile composite cylindrical foundation and construction method thereof

A cylindrical foundation and offshore wind power technology, which is applied in infrastructure engineering, construction, etc., can solve the problems of wind turbine construction, increased construction difficulty, and increased construction period, so as to reduce prefabrication and installation costs, improve composite bearing capacity, and reduce diameter. and the effect of length

Pending Publication Date: 2021-10-19
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the single pile foundation, the vertical bearing capacity of the cylindrical foundation is relatively weak. For the current large-capacity wind turbines, a higher vertical bearing capacity is usually required, and the depth of the skirt plate of the cylindrical foundation is usually chosen to increase, but this These measures will inevitably lead to the increase of wind turbine construction, construction cost and construction difficulty, and also increase the construction period to a certain extent.
During the installation process of the cylindrical foundation, due to the complex geological conditions of the seabed, incorrect calculation of the negative pressure sinking, and the soil plug effect caused by the sinking of the cylindrical body, the cylindrical foundation cannot be installed at the designated position, which in turn leads to failure of the negative pressure sinking. occur
In addition to adopting the measure of negative pressure subsidence, there is no better solution to the problem of cylindrical foundation subsidence
[0005] Therefore, in order to solve the problems of insufficient vertical, horizontal, bending moment bearing capacity and anti-overturning capacity and difficult installation of offshore wind power foundations, the present invention proposes a structural form of a combination of variable-diameter screw piles and a cylindrical foundation with an opening in the middle

Method used

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  • Offshore wind power variable-diameter screw pile composite cylindrical foundation and construction method thereof
  • Offshore wind power variable-diameter screw pile composite cylindrical foundation and construction method thereof
  • Offshore wind power variable-diameter screw pile composite cylindrical foundation and construction method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Such as figure 1 As shown, a composite cylindrical foundation of variable-diameter screw piles for offshore wind power includes a variable-diameter screw pile 1 and a cylindrical foundation 2;

[0033] Such as figure 2 As shown, the variable-diameter screw pile is a hollow steel pipe pile, which is divided into two parts: a wide diameter part L1 and a narrow diameter part L2; The bottom is flush; the rotary vane 5 is set on the screw pile of the L2 section, and the maximum range of the outer end of the rotary vane 5 of this section of the screw pile is defined as d, and d≤D is required. Variable-diameter screw pile 1 pile body diameter, length, wall thickness, number and spacing of rotating blades are determined by the overall force balance of the foundation and installation requirements.

[0034] The outer wall of the wide-diameter part L1 is provided with a quick-connecting buckle-male buckle 9, which is used to connect with the quick-connecting buckle-female buckl...

Embodiment 2

[0041] As described in Example 1, the construction process of a composite tubular foundation of variable-diameter screw piles for offshore wind power is as follows:

[0042] First, prefabricate variable-diameter screw piles and cylindrical foundations, then put the cylindrical foundations into the seabed through two steps of self-weight sinking and negative pressure sinking; then drill screw piles in the middle casing of the cylindrical foundations, wait for rapid After the buckle is connected, a unified whole is formed. If the negative pressure sinking of the cylindrical foundation is not in place, after the quick connection is completed, the entire foundation will reach the designated position together with the penetration force of the rotating blade of the screw pile, and the foundation sinking will be completed. Finally install the wind tower.

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Abstract

The invention discloses an offshore wind power variable-diameter screw pile composite cylindrical foundation and a construction method thereof. The foundation comprises a variable-diameter screw pile and a cylindrical foundation body. Firstly, due to the effective combination of the variable-diameter screw pile and the cylindrical foundation body, the composite bearing capacity of a whole structure is greatly improved, and then the applicability of the foundation under the complex ocean condition is improved; secondly, the variable-diameter screw pile and the cylindrical foundation body are connected through quick connecting buckles, so that the construction is easy and convenient, the operation is convenient, and the construction period is greatly shortened; and finally, compared with a traditional single-pile foundation, the composite cylindrical foundation has the advantages that the screw pile added with rotary blades can fully exert the resistance of deep soil, and good pulling resistance is achieved.

Description

technical field [0001] The invention relates to the field of offshore wind power foundation structures, in particular to a composite tubular foundation of variable-diameter screw piles for offshore wind power and a construction method thereof. Background technique [0002] Since the beginning of the 21st century, the global economy has entered a high-speed growth, and along with the high-speed economic growth is a substantial increase in energy consumption, so the research and development of renewable energy has attracted more and more attention. In the development of renewable energy, wind power generation has become the focus of global new energy development due to its advantages of large reserves and wide distribution. Compared with onshore power generation, offshore wind power has the advantages of stable wind direction, high wind speed, and no occupation of cultivated land, and has become the focus of research by experts and scholars. In the future, offshore wind power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D27/42E02D27/44E02D27/12E02D27/52
CPCE02D27/425E02D27/44E02D27/52
Inventor 刘润李天亮练继建杨旭
Owner TIANJIN UNIV
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