北闸

对于海口南北闸布置进行了三种方案比选：方案一利用六垛北闸和老海口闸方案；

The main contents researched in the paper are as follows : 1.Three layout alternatives of Haikou Gate are put forward .

在北闸2号护坦混凝土表面铺设1万平方米保温层，获得良好效果。

The thermal insulation layer of expanded perlite mortar was laid over the northern sluice 's No. 2 apron surface amounting to 10000 m2 . A good thermal insulation effect is achieved .

荆江分洪北闸加固工程2号护坦（斜面）混凝土的保温层采用了水泥膨胀珍珠岩砂浆，并对这种材料的保温效果进行了试验研究。

The expanded perlite mortar is adopted as thermal insulation layer for the concrete surface ( inclined plane ) of the No. 2 apron of Jingjiang Flood Diversion Project 's northern sluice in its strengthening engineering . Experimental study was conducted on effect of thermal insulation of this material .