发明名称 Well point and method of driving same
摘要 Several embodiments of a well point are disclosed which include a resilient member that elongates each time an anvil surface near the conical tip of the well point is impacted by a drive rod. The drive rod is repeatedly raised and dropped to force the well point downwardly through the soil, pulling sections thereabove until the desired casing depth is reached.
申请公布号 US4368785(A) 申请公布日期 1983.01.18
申请号 US19800174038 申请日期 1980.07.31
申请人 GONDEK, JOHN T. 发明人 GONDEK, JOHN T.
分类号 E21B4/06;E21B4/08;E21B7/18;E21B7/20;E21B7/26;E21B21/00;E21B21/10;E21B43/08;(IPC1-7):E21B7/20 主分类号 E21B4/06
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