Ashgal awards Qatar sewerage tunnel contract
Hochtief-led consortium to drill 15km long tunnel to serve south of Doha.
Hochtief Solutions Middle East Qatar, together with Al Sraiya Strabag for Roads and Infrastructure and Petroserv Limited, have signed a contract for construction of the central section of the new sewerage network under the capital of Qatar.
Public Works Authority (ASHGHAL) awarded the contract as part of an extensive refurbishment and expansion of the overloaded sewerage system in the south of Doha.
The system which serves an area of 680 square kilometers is required as the result of rapid population growth. The overall project includes several smaller connections to the existing sewer system.
Two boring machines will be used to create a tunnel of 14.7kms. After installation of the outer shell an inner lining will be added to protect the concrete from the aggressive gases by means of an HDPE membrane, thus ensuring a project life of 100 years.
The sewer tunnel will have an interior diameter of 4.5 meters. In addition to the tunnel, shafts up to 45 meters deep will be built, some of which will serve as connectors to other IDRIS construction contracts.
The joint venture is responsible for the execution planning for this demanding project which is scheduled to be completed by the beginning of 2019.