发明名称 Method and apparatus for laying pipelines on land
摘要 Method of laying pipelines on land, in which straight pipe pieces are aligned to each other above the trench route and are welded together, and the thus formed pipeline in welded condition is bent to an extent and in a direction defined by the trench route and subsequently is lowered down in a trench.
申请公布号 US4452550(A) 申请公布日期 1984.06.05
申请号 US19810282013 申请日期 1981.07.10
申请人 KONINKLIJKE BOS KALIS WESTMINSTER GROUP N.V. 发明人 HOFMEESTER, PAUL M.
分类号 B21D7/022;F16L1/032;(IPC1-7):F16L1/02 主分类号 B21D7/022
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