单壁钢围堰水下填充混凝土厚度设计

Thickness design of the underwater filled concrete for single wall steel cofferdam

为了确定单壁钢围堰水下填充混凝土厚度,以贵州省清水江白市库区的月山背大桥2^#桥墩加固工程为例,运用Midas/Civil建立围堰整体模型,初步计算出水下填充混凝土厚度。将初步确定的厚度进行了验算,结果显示出该厚度不足。在原有填充混凝土厚度的基础上,增加了一节围堰高度。计算结果表明:将该桥2^#墩围堰填充混凝土厚度增加一节围堰高度、且厚度为9.75m时,满足施工要求。因此,单壁钢围堰水下填充混凝土厚度设计应先确定初步厚度,验算初步厚度不满足规范要求时,添加一节围堰高度的厚度,直至满足规范要求为止。

In order to determine the thickness of the underwater filled concrete of the single-walled steel cofferdam, taking the reinforcement project of the 2^# Pier of Yueshan Bridge in Qingshuijiang River District, Guizhou Province as an example, the whole model of Cofferdam was established by Midas/Civil, and the thickness of the underwater-filled concrete was preliminarily calculated. The initially determined thickness is checked and the results show that the thickness is insufficient. On the basis of the thickness of the originally filled concrete, a section of cofferdam height is added. The calculation results show that the thickness of the filled concrete of the 2^# Pier Cofferdam of the bridge increases by one section of cofferdam height and the thickness is 9.75 m, which satisfies the construction requirements. Therefore, the thickness design of the underwater-filled concrete of single wall steel cofferdam should first determine the initial thickness, the initial thickness does not meet the requirements of the specification, add a section of the height of the cofferdam thickness can be added until the requirements of the specification.