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小浪底工程排沙洞预应力混凝土衬砌原设计为有粘结筋方案．在招投标期间，承包商提出采用无粘结筋作为替代方案．为了对两种方案进行慎重选择，在现场进行了１∶１室外模型试验．试验结果表明，无粘结筋方案具有张拉时摩擦损失小，可采用双圈布置，预压应力均匀，结构受力性能好，张拉槽数量少，施工简单、方便，节省材料等优点．
Xiaolangdi Project Sediment tunnel prestressed concrete lining was originally designed as a bonded bar program. During the bidding period, the contractor proposed the use of unbonded tendons as an alternative. In order to carefully choose the two options, a 1: 1 outdoor model test was conducted on site. The test results show that the non-gluing tendon scheme has the advantages of small friction loss during tensioning, double-circle arrangement, uniform pre-stress, good mechanical performance, small number of tension grooves, simple and convenient construction, material saving and the like.