Pipe joint for driving pipes laid underground by the driving technique
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United States of America Patent
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-
Nov 24, 1992
Grant Date -
N/A
app pub date -
Apr 11, 1991
filing date -
Jul 12, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pipe joint is described for driving pipes laid underground by the driving technique and having an inner pipe made of cast iron to which the force of pressure is applied during driving, wherein each driving pipe is constructed from the inner cast iron pipe formed without a socket and a coaxially disposed outer casing forming a lost casing for an intermediate layer of cement-containing material between the inner and outer pipes. The pipe joint has at least one seal ring disposed on a protruding portion of the inner cast iron pipe.
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