Combined with the analysis of original stress state of existing tunnel considering segment joints, the important internal causes of crack are found out.

结合对考虑拼接缝的既有隧道管片受力状态的分析，找到裂缝隔片产生在连接块上的重要内在原因。

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Based on the members' stress in the new and original load conditions, the evaluation and analysis on the actual state of headframe was obtained.

通过增大提升能力前后不同荷载下的构件应力对比，对增大提升能力后的井架的运行状况做出预估与分析。

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