中低水头船闸人字门浮箱及背拉杆抗扭能力研究

浮箱和背拉杆是中低水头船闸人字门提高抗扭能力的有效措施，但是考虑二者共同预应力的研究工作较少。基于江苏某在建船闸人字门，建立人字门空间薄壁结构有限元模型，对比设置不同浮箱的人字门抗扭能力，提出了较为合理的浮箱设置方案。在此基础上，研究不同背拉杆布置方式下人字门的抗扭能力，提出一种背拉杆预应力的改进优化模型，使施加预应力后闸门的整体抗扭能力得到更大提高。研究结果表明：采用U形浮箱及预应力背拉杆进行人字门组合抗扭的方案，可有效提高闸门的整体抗扭能力。研究方法和研究成果可为中低水头船闸人字门的设计提供参考。

Torsion resistance of miter gate buoyancy tank and back tie rod of medium and low head ship lock

Buoyancy tank and back tie rod are effective measures to improve the torsional resistance of miter gate of medium and low head ship lock. There is less research work considering both pontoon and back tie prestress. Based on the miter gate of a ship lock under construction in Jiangsu Province, a finite element model of miter gate space thin-walled structure is established in this paper. The torsion resistance of miter gates with different pontoons is calculated and compared, and a more reasonable pontoon setting scheme is proposed. On this basis, the torsion resistance of miter gate with different arrangement of back tie rod is studied, and an improved optimization model of back tie rod prestress is proposed, which can improve the overall anti-torsional ability of the gate after the prestress is applied. The research results show that the combined torsion resistance scheme of miter gate with U-shaped pontoon and prestressed back tie rod proposed in this paper can effectively improve the overall torsion resistance of the gate. The research methods and results can provide a reference for the design of miter gate of medium and low head ship lock.