【摘 要】
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对于大跨度的顶进框架涵体,采用经济合理的圬工后背尺寸可降低工程施工造价。为了保证后背设计尺寸的合理性,在框架涵顶进过程中,后背最大被动土压力应不小于最大设计顶力,且
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对于大跨度的顶进框架涵体,采用经济合理的圬工后背尺寸可降低工程施工造价。为了保证后背设计尺寸的合理性,在框架涵顶进过程中,后背最大被动土压力应不小于最大设计顶力,且两者的比值接近于1,同时后背的控制截面内力应小于其容许内力。本框架涵圬工后背设计为同类型大跨箱涵顶进施工具有一定参考意义。
For long-span jacking frame culverts, the cost of construction can be reduced by adopting the economical back size. In order to ensure the rationality of back design dimensions, the maximum passive earth pressure of the back should not be less than the maximum design top force, and the ratio of the two is close to 1, while the internal force of the back control section should be less than It allows internal forces. The framework of Han design back for the same type of large-span box culvert jacking construction has some reference value.
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