Cohesionless prestressed construction with steel strand cable which make two circuits circumferentially is carried out firstly in three desilting tunnels at Xiaolangdi Project.

• 小浪底水利枢纽工程3条排沙洞首次采用钢绞线环向两周无粘结施加预应力施工方法,该方法与常规施工方法在工艺流程上有所不同,操作较为简便。