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葛洲坝工程的特点是流量大,流速高。汛期最大含砂量达2.67公斤/立米,还有少量河床推移质。因此,三江冲砂闸和二江泄水闸的底板和护坦板顶层,浇筑有厚40厘米、平面尺寸为12×12米的400号高强混凝土,其下为200号普通混凝土。在浇筑过程中是先浇好底部混凝土,然后再浇高强抗冲耐磨混凝土。间歇期7天到1～2个月不等,个别的达半年以上.在总共500余块护坦板中,曾发现有一块新老混凝土(即抗冲耐磨混凝土与底部混凝
Gezhouba project is characterized by large flow, high flow rate. Flood maximum sand amounted to 2.67 kg / m3, there is a small amount of bed mass transfer. Therefore, the Sanjiang red sand sluice gate and the bottom of the two rivers and floodgate the top of the top plate, pouring a 40 cm thick, flat size of 12 × 12 meters of 400 high-strength concrete, which is under the 200 ordinary concrete. In the pouring process is to pour the bottom of the first concrete, and then pouring high strength and wear-resistant concrete. Intermittent period of 7 days to 1 to 2 months, some up to more than six months in a total of more than 500 Hu Tanpai, had found a piece of old and new concrete (ie, abrasion-resistant concrete and the bottom of the coagulation