深水风机基础灌浆连接结构承载性能研究

Study of Load Capacity of Grouted Connections for Deep Sea Wind Turbines

导管架作为海上风电深水区常用的基础结构形式,通过在内外钢管间的环形间隙填充高性能灌浆料,使上部导管架钢筒与下部桩基形成受力整体,从而保障风机能在大自重、高风速、强冲刷等严酷环境下20~30 y的安全使用。现有的设计及研究均按内外钢管同心考虑,但海上严苛的施工条件使得灌浆过渡段钢筒极易出现偏置。基于此,采用全尺寸原型试验考察了偏置情况下风机基础灌浆连接结构的承载性能。研究结果表明,采用JGMR?-SP201型风机基础灌浆料灌注的灌浆连接结构极限抗拔承载能力不小于20 000 kN,灌浆料与外钢筒之间未发生任何滑移。

Jacket foundation is commonly used in deep sea wind turbines,tubular hollow steel piles are in-situ attached with a high-strength grout to ensure the safety of wind turbines for 20~30 years in harsh environments,such as heavy dead weight, high wind speed, strong scour, etc. The adverse construction conditions of deep-sea wind turbines make the grouted connection susceptible to installation errors which were not fully considered in current design and research. A full-scale experiment was conducted to investigate the influence of eccentric error. It was shown that the extract bearing force of grouted connection used with JGM R?-SP201 is above 20 000 kN,and no slippage occurred between the grout and the outer cylinder.