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通过较厚流沙层和不稳定冲积地层掘进竖井时,除了冻结法和竖井钻机钻进法外,淹水沉井法也是有效的方法之一。而淹水沉井测量方法除了使用一般测量方法外,还需根据沉井的特殊条件进行特殊测量、资料整理
Flooding caisson method is also an effective method except for freezing method and shaft drilling machine drilling method when drilling vertical shaft through thick sand layer and unstable alluvium. In addition to the general methods of measurement of submerged caisson measurement, special measurements and data compilation are also required according to the special conditions of caisson