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1. 概述

 

三峡工程4#机压力钢管在设计形式上取消了伸缩节，其下平段凑合节与下游钢管之间的最后一道环缝即合拢焊缝是在强约束条件下施焊，高强度大厚板压力钢管在强约束条件下施焊，会产生很大的焊接应力和变形。为了保证机组安装质量，三峡总公司厂坝（综）[2001]第109号文要求：在合拢缝施焊过程中，座环变位不应超