水闸是农田灌排渠系配套中不可缺少的水工建筑物。常见的有浆砌石式、钢筋混凝土式、装配式,还有近年来发展的一字沉板式。这些水闸的上部结构(包括支架和工作桥)或是把闸墩抬高,借以支承工作桥;或是用立柱作支架,上面分设工作桥和启闭机梁。这些结构均以简支型式出现,其弊端是施工不便,外型不美观,造价也高,特别是由于泥沙等堵塞使闭门力增大时,不能迅速关闭闸门。这里介绍的是一种用于中小型水闸的上部结构。其构造型式是将支架、工作桥、启闭机承台三者合一,形成一个整体式的门型刚架(类似雨蓬式)。这种结构型式能改善上部结构的受力条件,并能增大启动力,同 Sluices are irrigated canal irrigation system indispensable to the hydraulic structures. Common masonry mortar, reinforced concrete type, assembly type, as well as the development of the word sink plate in recent years. The superstructures (including cradles and working bridges) of these sluices either lift the pier to support the working bridge or use the column as a support on which the working bridge and hoist beam are divided. These structures all appear in the form of simple support. The disadvantages are inconvenient construction, unsightly appearance and high cost, especially when the door closing force is increased due to clogging of sediment and the like, and the gate can not be closed quickly. Here is an upper structure for small and medium sized sluice. Its structure type is the support, working bridge, hoist platform integration of the three, forming a monolithic door frame (similar to the awning-type). This type of structure can improve the upper structure of the stress conditions, and can increase the starting force, with