上闸首 meaning in Chinese

head bay
upper gate bay
upper head

In combination with the construction practice of xinba lock , this paper introduces culvert construction of tile lock ' s upper lock head and preventive measures for cracks
摘要通过新坝船闸施工实践，介绍了船闸上闸首输水廊道施工及预防裂缝产生所采取的措施。
General situation and characteristics of upper & lower lockheads design of zhuzhou navigation - power junction , and the contents and effect of simulation research on lockhead constructed on weak bed rock and ununiform rock bed are described
摘要介绍株洲航电枢纽船闸上下闸首的设计概况和特点、软弱岩石地基和不均匀岩石地基上闸首仿真研究的内容和效果。