110kV户外GIS设备模块化装配式混凝土工字形基础研发

Research and Development of Modular PC I-shaped Foundation for 110kV Outdoor GIS Equipment

根据变电站户外GIS设备的布置形式及运行特点,提出设备模块化装配式混凝土工字形基础。针对已经投建的110kV变电站户外GIS设备进行模块化装配式混凝土工字形基础设计,采用有限元方法进行了两种极限荷载工况下的分析论证。结果表明,钢筋的最大Mises应力和预制件混凝土的最大主压应力均远低于钢筋屈服强度设计值和混凝土的抗压强度设计值;预制件混凝土的最大主拉应力为2MPa,大于混凝土抗拉强度设计值,但低于混凝土抗拉强度标准值,不会开裂;基础最大竖向位移分别为7.663mm和5.391mm,远低于DL/T5457—2012中容许值200mm的要求;GIS设备装配式基础整体最大沉降差分别为2.150mm和1.896mm,满足DL/T5457—2012中容许沉降差或倾斜0.002L(L为基础对应方向长度)以内的要求。

According to the layout and operation characteristics of outdoor GIS equipment in substation,a modular PC I-shaped foundation is proposed.The modular PC I-shaped foundation is designed for the finished outdoor GIS equipment of 110 kV substation,and the finite element method is used to analyze and demonstrate under two ultimate load conditions.The main conclusions are as follows:the maximum Mises stress of reinforcement and the maximum principal compressive stress of PC are far lower than the design value of yield strength of reinforcement and compressive strength of concrete;The maximum principal tensile stress of PC is 2 MPa,which is greater than the design value of concrete tensile strength,but lower than the standard value of concrete tensile strength,and will not crack;The maximum vertical displacement of the foundation is 7.663 mm and 5.391 mm respectively,which is far lower than the allowable value of 200 mm in DL/t5457—2012.The maximum settlement difference of the assembled foundation of GIS equipment is 2.150 mm and1.896 mm respectively,which meets the requirements of DL/t5457—2012 that the allowable settlement difference or inclination is within 0.002 L(Lis the length of the corresponding direction of the foundation).