• B246 PESCARA 1
  • B246 PESCARA 2
  • B246 PESCARA 3
  • B246 PESCARA 4
  • B246 PESCARA 1
  • B246 PESCARA 2
  • B246 PESCARA 3
  • B246 PESCARA 4

Pescara D'Arquata water supply

Country ITALY - Marche
Client Consorzio Idrico del Piceno (CIIP)
Services provided preliminary design; final design; detailed design; Environmental Impact Study; Supervision of works; Safety coordination during the execution of the works
Period of execution 03/1999 – 10/2002
Construction cost € 22,057,386 (project), € 16,220,815 (Supervision of works)
KEY FACTS / KEY DATA 12 km of total length
6.7 km of new gallery
5km of consolidated gallery
630 l / sec flow rate



EXPLANATORY SUMMARY

The Pescara di Arquata water supply main was constructed by the Consorzio Idrico Intercomunale del Piceno (CIIP) between 1943 and 1961. Its overall length is about 60 km, and it is fed by various upland springs with a maximum flow-rate of about 630 l/s. It provides water to the municipality of Ascoli Piceno, numerous areas of the Fermano district, and as far as the Adriatic coast, where it supplies San Benedetto del Tronto and other major tourist centers in the surrounding area. Particularly in the part involved in the work, its layout runs through a restricted area of great environmental importance. The work was found necessary owing to evident deterioration of the structure and tunnel linings, in some cases so serious that they are no longer accessible, as well as the impairment of pipe bridges. It was also found necessary to adapt the structure providing access and the possibility of maintenance using modern equipment. In fact, the small size of the tunnels and lack of valid service tracks made this impossible. It was therefore decided to restore and consolidate the static conditions of the tunnels, to repair some sections of the pipeline and to construct an improved route for the water supply line, mainly in tunnels. On the three pipeline bridges the deteriorated concrete was demolished, the re-bars were cleaned and integrated where necessary. The overview of the works also included the adaptation of the Colleforno divisor and the implementation of ancillary works, such as road networks needed for site access. As far as possible, the restoration and consolidation of the pipeline have followed anti-seismic regulations in force. The planning of the works aimed primarily at ensuring the continuation of the water supply at every stage, while guaranteeing operating conditions taking into account the maintenance and operating requirements of such a major utility.

THE PROJECT: CHALLENGES AND SOLUTIONS

Owing to space restrictions and the need to keep the existing pipeline operating during the works, it was found necessary to limit operations in tunnels: for this reason, for consolidation purposes a coating was chosen consisting of liner plates, with longitudinal and cross plates welded either at site or at the factory and then bolted into place. Mortar was subsequently injected for back-filling through previously made holes. In order to optimise water supply continuity even during catastrophic events such as landslides or earthquakes, steel was chosen as the piping material, considering the disadvantage of lower corrosion resistance as being of secondary importance. The main tunnel was excavated using a rotating head cutter, a mechanised excavation system that, by virtue of its high production rate, significantly reduces both time and cost overall. Access roads were designed so as not to alter the conditions of the terrain, consisting mainly of very steep wooded slopes. Where possible, existing layouts of the Corpo Forestale routes were used. Lastly, we must mention the effective synergy between the Client, Works Supervision and Contractor, and the collaboration with which operations were carried out, resulting in a satisfactory solution being found for all problems emerging during operations and for the completion of the work, duly tested and operating, according to time schedule.

SERVICES:

  • preliminary design
  • final design
  • detailed design
  • Execution of geological surveys, testing and surveys, laboratory tests
  • Environmental Impact Study
  • Supervision of works
  • Safety coordination during the execution of the works


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