浮箱结构船闸人字闸门预应力背拉杆设计

大型船闸人字闸门因门体较高、启闭时雍水阻力及风阻力较大，背拉杆大多采用预应力结构。为延长其顶底枢的使用寿命，常在最低通航水位以下设置浮箱。结合下坝复线船闸，先介绍预应力背拉杆及浮箱的布置形式，再着重引入美国陆军工程师兵团SHERMER C L提出的理论进行设计计算，最后对有浮箱结构的人字闸门背拉杆预应力施加方法进行探讨。

Design of prestressed back-tie rods in miter gate with floating box structure

The application of prestressed back-tie rods in the large-scale miter gate can increase the torsional rigidity .Combining with the Xiaba multiline lock, the paper introduces the arrangement form and the calculating theory which is put forward by the U.S. Army Corps of Engineers SHERMER C L, and discusses the choice of the parameters and calculation process. Moreover, it investigates the application of prestress to the back-tie rods. The result shows that the calculating theory of the prestressed back-tie rods is feasible. It may serve as reference for related engineering calculations, construction and maintenance.