SPSE – Footbridge from the PL1 to the crossing of la Durance

Planning and monitoring of repair and reinforcement works


The South European Pipeline (SPSE) owns an oil pipeline that crosses the floodplain of the Durance river, south of Avignon, connects to a conduit that serves the Nord-East of France and West Germany from Fos-sur-Mer (Bouches du Rhône – 13). The oil pipeline was built in 1962, and was in use until the mid 1980s. To enable the pipeline to be used again, SPSE wanted the structure to be comply with seismic regulations. SPSE instructed DIADES to, firstly, carry out the complete diagnosis of the pipeline with LERM (part of the Setec group) and, secondly, structurally reinforce the pipeline in order to ensure its durability and enable it to withstand seismic impulses.

Client & Project manager

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Principal features

Reinforcing the decks and piers to enable the structure to withstand seismic impulses without reinforcing the foundations. Designing the reinforcement in such a way as to increase the life expectancy of the structure and improving the geometry of the additional exterior prestressing to compensate for any possible future defects in the interior prestressing of the concrete.

  • 260-metre long prestressed concrete structure




DIADES’ tasks

DIADES carried out the project management, which included the following phases:

  • Static and dynamic study of the structure’s load-bearing capacity,
  • Pre-project design setting out the investigations necessary to perfect the technical solution,
  • Project involving the reinforcement of the structure to enable it to withstand possible seismic impulses and to prolong its life expectancy,
  • Preparation of the tender documents and assistance with the award of contracts,
  • Preparing the specifications for outside inspections necessary to the proper execution of the works,
  • Project management of the reinforcement works: project conformity assessment and approval of plans (VISA), supervision of works (DET), instructing, managing and coordinating the contractors (OPC) and approval of works on completion (AOR).




Download the project sheet