减小管芯与保护层界面处径向拉应力,提高或确保界面处混凝土的抗拉强度,排除或杜绝界面处结构缺陷,是解决空鼓问题的三条技术途径。由界面强度和作用应力所引起的空鼓,称为结构空鼓。在这方面,国内外学者和不少单位都进行了试验研究,讨论得较多、较深。由结构缺陷引起的空鼓,称 Reducing the radial tensile stress at the interface between the die and the protective layer, increasing or ensuring the tensile strength of the concrete at the interface, and eliminating or eliminating structural defects at the interface are three technical approaches to solve the hollowing problem. Hollow drums caused by interface strength and applied stress are called structural hollow drums. In this regard, domestic and foreign scholars and many units have carried out experimental research and discussions have been more and more extensive. Hollow drum caused by structural defects, said