The Qatar Building Company, on behalf of the Ashghal Public Works Authority, is constructing a network of water surface pipelines using microtunnelling and conventional trenching to extend the country’s sewer system.
The Doha and Rayyan sewerage scheme is to be completed over three phases. The project began on 1 November 2007 and the projected completion date in mid-2009.
Phase 1 – Abu Hamour Area Sewerage 624 & 625 – involved the construction of 50 kilometre of trunk, branch and lateral sewers lines by microtunnelling and conventional trenching.
Phase 2 – catchments 25 and 26 – The Qatar Building Company constructed 6 kilometre of trunk sewer pipe network by microtunnelling. The diameter varied from 600-2000 mm at depths up to 20 metres. This phase of the project also included the construction of an underground tank and temporary pumping station.
Phase 3 – construction of Muraikh Area drainage and outfall – The company will construct 18 kilometre of surface water pipelines using microtunnelling combined with conventional trenching. The microtunnelling aspect of the project will use pipes in varying diameters, 1,500, 2000, 2400 mm at depths up to 20 metres.