New module for U.N.S.:
Continuous joint measurement.
Requirement: Avoiding jacking pipe overloads.
During pipe jacking along challenging alignments and in difficult geologies, damage to jacking pipes is likely to occur. In the majority of cases, local overloads on the pipe material due to excessively high partial tube sheet stresses cause such damage. Jacking pipe overloads may not only be caused by excessive jacking forces but also by excessive angular deflections. Jacking pipe damage includes spallings occurring directly on the tube sheet, longitudinal cracks on the pipe and extensive sherd fractures on the tube sheet and the outer surface of the pipes.
Solution: OLC - Online Load Control.
To avoid jacking pipe overloads and guarantee damage-free pipe jacking, a monitoring system has been developed to capture the load distribution on the pipe joints. The systems allows early detection of critical pipe stresses that might cause damage. On selected pipe joints, four distance sensors measure the gap dimensions of the joints and transmit them via a measuring amplifier to the computer in the control container. In the control container, angular deflection and stress distribution are calculated and all data is completely documented. The resulting admissible jacking force is calculated online. The allowed and currently applied jacking force is displayed to the operator in the control container in real time. Imminent pipe overloads can be counteracted timely.
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