一、前言汉江丹江口水利枢纽工程,挡水建筑物,河床为混凝土宽缝重力壩,两岸为土石混合壩。总工程数量混凝土为335万立方米(包括电厂和通航建筑物),填筑土石为450万立方米(不包括附属建筑物)。在施工程序上,采取了先河床(水下)后两岸(水上)的施工方法;就是先集中一切力量攻下水下的艰巨工程,待到达一定时间,全线进军,一气呵成。由于先进行河床的施工,第一期工程除修建围堰和清基外,必须采运足够的砂石骨料满足混凝土第一期的浇筑需要,整个混凝土大壩需要砂石骨料480万立方米,第一期工程在截流前需浇筑 I. Introduction Hanjiang Danjiangkou Water Conservancy Project, retaining structures, riverbed concrete wide gap gravity dam, both sides of the earth and rock mixing dam. The total number of works is 3.35 million cubic meters of concrete (including power plants and navigable structures) and 4.5 million cubic meters of earth and rock (excluding ancillary buildings). In the construction procedure, the construction method of taking the first riverbed (underwater) and the two banks (waterborne) after the first riverbed (underwater) is adopted; that is, all arduous efforts should be focused on the arduous project under the water first. As the first riverbed construction, the first phase of construction in addition to the construction of cofferdam and clear base, you must pick enough gravel aggregate to meet the first phase of concrete pouring needs of the entire concrete dam needs 4.8 million cubic meters of aggregate Rice, the first phase of the project before pouring to be poured