长江葛洲坝水利枢纽工程大江防淤堤,下游导流堤等,水下护坡护底防冲,需从水上抛投单个块体重3.0～20T的特大块石100万M~3,如果采用混凝土四面体替代块石,则需增加投资3000万元。如何经济合理开采数量巨大的特大块石满足工程要,是当时的重大难题。葛洲坝机械分局自1983年历经5年的开采生产,摸索了一套开采特大块石的方法,並取得了一些经验。 In the case of the Dajiang Gezhouba Water Control Project, the Dajiang silt embankment and the downstream diversion embankment, etc., the underwater protection slope protects the bottom and defends against erosion. One large block of stone with a mass of 3.0 ~ 20T needs to be thrown from the water for 1 million M ~ 3. If the concrete tetrahedron Alternative stone, you need to increase investment 30 million yuan. How to economically and reasonably exploit a large number of large blocks of stone to meet the needs of the project was a major challenge at that time. Gezhouba Machinery Branch since 1983, after 5 years of mining production, groping a set of methods for the exploitation of large stones, and has made some experience.