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一、任务的提出葛洲坝工程二江下游护坦板的局部检修设备,设计采用钢质沉底抽水围囹,其外壁垂直压力7800吨(垂直水压加结构自重)通过底部支承结构传递至混凝土护坦表面。对围囹的要求是:(1)垂直压力不能将护坦表面的混凝土压坏(混凝土允许压应力130公斤/平方厘米);(2)底部圆形周圈应严格密封不容许漏水(护坦表面最大不平度100毫米)。经过选择研究,采用橡胶材料制成异型断面的支承结构;其周圈止水也用橡胶作成另一种形式的专用结构。并委托南京橡胶厂按设计作成长50厘米一段1:1的试件,在300吨立式压力机上进行模拟施压试验,分析所设计的支承结构在受压后的竖向变形能否满足接合表面较大的不平度;和
First, the task of Gezhouba project construction Ergyangban lower parts of the Tung Pai local maintenance equipment, the design of the steel sinking Shen Su Wai Wai, the outer wall of the vertical pressure of 7800 tons (vertical pressure plus structural weight) through the bottom of the support structure is transferred to the concrete protection Tan surface. The requirements of the enclosure are as follows: (1) The vertical pressure can not crush the concrete on the retaining surface (the compressive stress of the concrete is allowed to be 130 kg / cm 2); (2) The bottom circular circumference should be tightly sealed, Surface maximum roughness of 100 mm). After the choice of research, the use of rubber material made of heterostructured cross-section of the support structure; its peripheral seal is also made of rubber into another form of special structure. Nanjing Rubber Factory was commissioned to design a 50-centimeter-long piece of 1: 1 test piece and perform simulated pressure test on a 300-ton vertical press to analyze whether the vertical deformation of the designed support structure meets the requirements of the joint Larger surface roughness; and