适用于潮流能电站的新型模块式嵌岩灌注桩基础结构的应用

Application of a Novel Modular Foundation with Rock-Socketed Cast-in-Place Piles for Tidal Current Power Stations

近年来,潮流能能量转换技术发展迅速,但大型潮流发电机组基础结构方面的研究和应用还并不多见。针对潮流能电站基础结构在抗弯抗剪强度、桩径尺寸方面的特殊要求,结合我国潮流能富集区海底多为浅覆盖层或裸露基岩、且地形复杂的情况,提出了一种新型模块式嵌岩灌注桩基础结构。该基础结构的嵌岩灌注桩通过在桩内布置环形钢板箍和钢筋束来增强抗剪抗弯能力,使其在常规桩径即可满足潮流能电站的支撑要求,减少了对发电水流断面的阻挡;各主体灌注桩可通过横撑、纵撑和斜撑连接构成模块式基础,以适应不同地形条件、不同机组数量和安装方式的要求。新型模块式嵌岩灌注桩基础结构在LHD联合动能公司3.4 MV潮流发电项目中进行了首次应用,获得了良好的使用反馈。

China has huge reserves of tidal current energy resources, and related energy conversion technologies have developed rapidly in recent years. However, the research and application on the support structure of largescale tidal current power stations is still relatively rare. The seabed of China’s tidal current energy enrichment areas is mostly shallow cover or bare bedrock, featured by complex terrain. Meanwhile, the foundation of tidal current power station has special requirements for bending and shear strength and pile diameter. Aiming at solving these problems, a novel modular foundation with rock-socketed cast-in-place piles is proposed for tidal current power stations. The rock-socketed cast-in-place piles of the foundation can enhance the bending and shear strength by arranging the annular steel plate hoops and steel bar bundles inside the piles. In this way, the support requirements of tidal current power station can be met by conventional pile diameter, with the blockage of flow cross section for power generation reduced. The main steel casings can form a modular foundation through cross struts, vertical struts and diagonal struts in order to adjust different terrain conditions, turbine numbers and installation methods. The modular foundation with rock-socketed cast-in-place piles was firstly applied in the LHD 3.4 MV Tidal Power Station Project, obtaining good feedback in real application.