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La revue soGaz #5

Hauts de France II pipeline project

13/09/2013

The Direct Pipe method: an innovative technique for crossing the Somme.


In order to get its Hauts de France II pipeline across the Somme, GRTgaz, the majority owner of the gas transport network, has decided on a technique that has not been used in France before for this type of project: the Direct Pipe method.

Work commenced on 13 September in Corbie (Somme) and lasted for around 20 days, covering a distance of 1 km at a maximum depth of 15 m.

It was carried out by Drillcon, a subsidiary of Dutch company A-Hak BV which had already used this technique in the Netherlands. Instead of first drilling a tunnel through which a pipe is then inserted, the technique involves carrying out both these operations at the same time, installing a boring head directly onto the pipe. Debris can then be removed through the pipe.

The advantage of the technique is that the length of works can be considerably reduced in a zone which is home to many protected animal and plant species.

Direct-Pipe's technic illustration

Work began on the Hauts de France II pipeline in 2012 and should be complete by next year. This pipeline will connect the future LNG terminal in Dunkirk to Cuvilly (in the Oise département), a distance of 191 km.

Work began on the Hauts de France II pipeline in 2012 and should be complete by next year. This pipeline will connect the future LNG terminal in Dunkirk to Cuvilly (in the Oise département), a distance of 191 km.


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