葛洲坝工程规模大,土石方约7060方立米,混凝土近1000万立米,总工期约12年。施工设计应研究合理的施工程序,施工方案,施工技术和总体规划,以保证质量好,速度快,成本低,设计既要先进又要切实可行留有余地。1971年开工以来已建了一些施工企业和附属工程,1972年底开始修改设计,1975年4月提出修改初步设计报告,由于候改设计的工程布置 Gezhouba project is large-scale, about 7060 cubic meters of earth and stone, nearly 10 million cubic meters of concrete, the total duration of about 12 years. Construction design should study reasonable construction procedures, construction plans, construction techniques and overall planning to ensure good quality, fast, low cost, the design should be advanced and practical leave room. Since 1971, some construction enterprises and ancillary works have been built since the start of construction. At the end of 1972, the design was revised and the preliminary design report was revised in April 1975. Due to the engineering arrangement