Dorset County Water has continued to invest in new trenchless moling technology.
With our trenchless water pipe replacement we deploy a mole to do the work for us. In this case “moling” refers to the small pneumatic device that burrows and hammers its way through the ground, and you can see how it works from the illustration.
The standard approach to moling is to excavate a moling pit about 1m2 and 1m deep. The mole is then entered into the earth on the horizontal face at the bottom of this moling pit. A destination pit of similar proportions is also excavated, and this is where the mole emerges.
The mole works as a pneumatic cylinder with pulsed compressed air causing the head of the mole to repeatedly hammer against the soil in front it. Once the mole has passed through the earth the new supply pipe can be pulled through the long horizontal hole.