...结构托换；砂筒 [gap=1101]rds:bridge; Vietnam Balong Bridge; integral descending; structural underpinning; sand cylinder ...
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捞砂筒也可用作业井底取样器。
从井底去除砂子和碎片所用的由钢丝绳起下的捞砂筒。
A wireline bailer that is used to remove sand and debris from the bottom of a well.
捞砂筒为一个5英尺圆筒，它在大气压力下被下入井内。
The bailer is a 5-ft cylinder that is lowered into the well under atmospheric pressure.
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