“Example of Use” for Reverse Circulation:
The design capability of Colcrete Eurodrill has been a great advantage for special projects such as one for a client working in Hong Kong. As encountered in many countries, drilling with the use of standard down the hole hammers (dth) is not possible due to the problems of air being pushed in to the ground, resulting in destabilization. The answer involved getting the air back to the surface using a triple rod system. This enabled drilling mud to be pumped down the centre of the triple rod system, the mud also removed the chippings exhausting on the exterior of the rods. The annulus between the central rod and the next rod allowed the air down to operate the down hole hammer. The final annulus enabled the air to return to the surface without injecting air in to the ground. The client wanted a quick system of connecting the rods as the existing flange assembly system was very time consuming. This system required careful design and obviously very careful manufacture to enable it all to be assembled correctly. If this were not produced perfectly, assembly and operation of the system on site would not be possible. Colcrete Eurodrill design capability overcame these problems.