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Chapter 11. Trenchless technology.
In the past every cable or main could only be placed by continuous, open-cut excavation. This method
gives a lot of disturbance directly above and next to the hole. In present times the consequences for
the environment around these open cuts have become unacceptable. The trenchless technologies
offer an alternative for these situations in many cases. Since the 1950s, it has been relatively common
to use jacking and rotary boring methods to bore horizontal holes to install pipeline and utility
crossings under rights-of-way such as highways and railroads. The last decades the use of these
techniques in the Netherlands expanded rapidly.
The goal of this chapter is to give an introduction to the trenchless technologies. It shows when and
where it can be used and it gives the principles of the different techniques. Furthermore, the
advantages, disadvantages and important parameters will be discussed. Also the reparation methods,
the open-front technology, closed front drillings and the horizontal directional drilling methods will be