| 摘要 |
In the case of an earth boring apparatus, preferably a thrust boring apparatus, the head of which is actuated by a pneumatically operated reciprocating ram, a supply hose (5) provides the connection from a compressor as an example to the thrust boring apparatus which also serves to reverse the direction of operation by the rotation of the hose. To ensure error-free control over greater lengths of hose and to avoid kinking-partly due to the pressure from surrounding ground-the hose (5) is equipped with a snugly fitting corset (12) in the form of a spring wire spiral or a woven wire support.
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