HDD and Pipe Jacking in MRT site

In MRT site where all the pier are sitting on the highways, utilities usually needed to be relocated to avoid the bore pile and the pile cap location, as open trenches is hardly done with the speedway dense traffic

So, there are actually few ways to do it.

1. Horizontal Directional Drilling - HDD @ info from wikipedia : 

Directional boring, commonly called horizontal directional drilling or HDD, is a steerable trenchless method of installing underground pipes, conduits and cables in a shallow arc along a prescribed bore path by using a surface-launched drilling rig, with minimal impact on the surrounding area. Directional boring is used when trenching or excavating is not practical. It is suitable for a variety of soil conditions and jobs including road, landscape and river crossings. Installation lengths up to 2000 m have been completed, and diameters up to 1200 mm have been installed in shorter runs.

2. Pipe Jacking or micro-tunneling
It is a method of making the pipeline in underground by pushing the pipe from the driving shaft with the jack. Today,it is the main method used for pipe laying to preserve the natural environment and maintain pleasant living condition.

I bet it is hard to visualise the process of it, i had attach herewith the youtube link for the convenience.

1. HDD - http://www.youtube.com/watch?v=ufYMgHa0d18

2. Pipe Jacking - http://www.youtube.com/watch?v=_tOx0KTmzbw




Enjoy ~