Horizontal drilling systems
In the pipe-drilling process, pipes are jacked underground at the same time as soil cutting (face of heading) and soil removal by the auger to the launch pit. The pipe-drilling technique is an economical alternative to open trenches, if building supply and disposal lines have to be laid or small sewers have to be constructed in built-up areas.
The trenchless method prevents ground vibrations and deformations being transmitted to the surrounding soil and to the surface. It is ideal if roads, cycle tracks, pavements, gardens or rails have to be crossed. There are no problems with traffic holdups, noise or emissions from construction machinery. No dependence on the weather. No damage to pipes encountered on route because the mole can be accurately aimed past existing lines.
ขอขอบคุณข้อมูลจาก :: es-verbau.com http://www.es-verbau.com/html_en-GB/pdf/horizontal_drilling_systems_344.pdf