advanced technolgy, easy for construction, no need to dig the earth PSNP series sludge-liquid balance method pipe-jacking tunneller can used in the site where the ground is not able to be digged, for example: a saweage pipe construction cross a river, a building, a road, and so on.suitable for pipe dia.800mm to dia.1500mmdrives: large-power variable frequency motorpanel cutter headwobbing ...