发明名称 |
ACTIVATABLE SEAL FOR PIPES TO BE DRIVEN IN THE GROUND |
摘要 |
<p>The invention relates to a seal for pipes to be driven in the ground. The essential feature of this invention is that the seal (3), consisting of rubber or material similar to rubber, has grooved slots (4, 5) on both sides and can be activated by means of a medium which can be injected and increases the total volume, the cavity (7) which is initially available for this medium being small in comparison with the total volume of the seal in the non-activated state. <IMAGE></p> |
申请公布号 |
EP0340658(A3) |
申请公布日期 |
1991.11.06 |
申请号 |
EP19890107747 |
申请日期 |
1989.04.28 |
申请人 |
PHOENIX AKTIENGESELLSCHAFT;WAYSS & FREYTAG AKTIENGESELLSCHAFT |
发明人 |
GROSSE, VOLKMAR, DIPL.-ING.;GLANG, SIEGFRIED |
分类号 |
E21B17/08;E21D11/38;F16L17/10;(IPC1-7):F16L1/02;F16L17/00 |
主分类号 |
E21B17/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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