ALFRED McALPINE Civil Engineering has nearly finished the enabling works for the City of Manchester Stadium being built for the 2002 Commonwealth Games.
The stadium will form the centrepiece of the games and the focal point of the massive new Sportcity development. The stadium will become home to Manchester City Football Club in 2003.
The £4M contract for Manchester City Council involved excavating 200,000m3 of material including heavily reinforced buried concrete structures. Another 30,000m3 was also dug out for a new 7m deep basement to the new stadium.
Excavated concrete is being reprocessed on site by two mobile crushing plants - with steel reinforcement removed before crushing. Suitable material has been placed in embankments or used to backfill excavations. This saved new materials and reduced the amount of site traffic travelling through east Manchester.
Concourse areas, running tracks and car parks have been covered with a 500mm layer of reprocessed material - around half of which was won from site.
The site is partially underlain by coal seams - although there are none under the stadium footprint - which were pressure grouted using 1500, 30m deep boreholes.
Earthworks were phased to allow major service diversions by other contractors and included the installation of ten trial bored piles for load testing and also construction of three mass concrete reaction blocks within the stadium area for anchor testing.
Areas that are going to be piled were topped off with a 300mm thick protective layer of imported granular backfill laid on a geotextile membrane.