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• Time of issue:2020-10-14 10:11
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(Summary description)When the pipeline stops the pipe jacking machine to push, this supporting effect disappears, because the bentonite pressure method is also stopped, so when the pipeline is re-topped by the pipe jacking machine, as the first measure, it must be restored This supporting role. For this reason, before starting the main pressure station and medium pressure station of the pipe jacking machine, the bentonite suspension must be injected into the entire pipeline for a long enough time. The time needed to be long enough is because the suspension can only flow slowly between the surface of the pipe and the surrounding soil under the usual flow limits. After a long pause, it is best to use a suspension with a lower flow limit when re-jacking the top of the pipe, that is to say, the content of bentonite is lower than the content corresponding to the standard particle size. In order to enable the suspension to quickly reach the injection nozzle without first squeezing the hardened materials in the bentonite pipe with high pressure, it is best to empty the bentonite pipe before a long-term standstill. It is a troublesome task to empty the bentonite pipeline inside the pipeline, because in this way, it is inevitable that there will be Perun mud slurry everywhere in the pipeline. In order to play the same role as emptying the pipeline without causing the trouble of fouling the pipeline, you can pump clean water into the pipeline before shutting down the bentonite pressure delivery system. The water volume should be as accurate as possible and just equal to the pipeline. Volume. When the pipe jacking machine is re-topped, the water in the pipe must first be discharged with a very small pressure until the suspension continues to flow out.