Therefore, before starting the main pressure station and high-pressure station of the pipe jacking machine, it is necessary to bet the sodium-based bentonite mixture on all the pipelines for a long time. The time must often be long enough because the mixed liquid only slowly moves between the surface layer of the water pipe and the surrounding soil layer under the general flow limit. After a long period of interruption, it is better to use a mixture with a lower flow limit when jacking the pipe again. In other words, the composition of sodium bentonite is lower than that of the standard particle size. In order that the mixed liquid can be quickly placed on the injection nozzle without first squeezing the hard blocks in the sodium bentonite pipeline with a high working pressure, it is better to drain the sodium bentonite pipeline before the long-term interruption. Exhausted.

 

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. Rock pipe jacking machine

The pipe jacking construction of the pipe jacking machine is an underground construction. The underground conditions have changed, and the transformation of geology is very easy to cause full expansion, and it is also very easy to cause the pipe jacking machine section to be destroyed. The key drag reduction countermeasure for the pipe jacking construction of the pipe jacking machine is to introduce thixotropic mortar along the pipeline during the whole process of jacking. If the introduction of thixotropic mortar is not ideal, it will cause excessive force and damage the pipeline. To prevent unsuccessful pipe jacking work caused by improper operation, the following needs to be done:

 

(1) Do a good job of surveying the geological conditions of the jacking axis before the jacking construction of the rectangular pipe jacking. In addition to understanding the geological survey data provided by the design, the construction unit also needs to intensify drilling by itself, so that the road ahead is clear and the roof can be opened again. Greatly reduce the occurrence of problems.

 

(2) The rock pipe jacking machine must be accurately controlled during the jacking process, try to avoid large-angle deviation correction, and make the pipe jacking as straight as possible. This requires mechanical operators to strictly follow the operating regulations and have good operating experience. As a pipe jacking team with considerable experience, it is not difficult to do it.

 

(3) During the jacking process of the pipe jacking machine, the injection of thixotropic mud must be controlled to ensure that the mud injection has the effect of reducing drag and control the jacking force within a certain range.