可拉压预应力钢支撑结构及其性能评价

Structure and Performance Evaluation of Prestressed Steel Strut Capable Against Tensile and Compressive Stresses

针对传统钢支撑不能受拉、混凝土支撑工序复杂且拆除产生大量建筑垃圾等问题,研发可拉压预应力钢支撑结构。对可拉压预应力钢支撑结构进行技术评价及造价对比,结果表明:其抗压承载力与传统钢支撑相同,与混凝土支撑相当;抗拉性能及支撑刚度与混凝土支撑相当,优于传统钢支撑;施工便捷性与传统钢支撑相当,优于混凝土支撑;造价与传统钢支撑相当,比混凝土支撑低20%~30%。在地铁基坑工程中,首道支撑采用可拉压预应力钢支撑,相比混凝土支撑,在保证支护效果的同时,能够产生更好的经济效益和社会效益。

Traditional steel struts cannot be tensioned,and the construction of concrete struts is complex and generates considerable construction waste during the demolition phase.Therefore,prestressed steel struts capable against tensile and compressive stresses have been invented.The performance evaluation results of mechanics,construction adaptability,and cost with a prestressed steel strut capable against tensile and compressive stresses show that its compression bearing capacity is the same as that of a traditional steel strut and equivalent to that of a concrete strut.Furthermore,its tensile and strut stiffness performances are equivalent to those of a concrete strut and superior to those of a traditional steel strut.Its construction convenience is equivalent to that of a traditional steel strut and 20%–30%lower than that of a concrete strut.The first concrete strut replaced by a prestressed steel strut capable against tensile and compressive stresses for metro excavations can not only ensure technical performance but also result in better economic and social benefits.