Gwangmyeong city is a suburb about 20 miles south west of the city of Seoul.  It is the location chosen for the first development of its kind in Korea; a privately funded velodrome, a principle aim of which is to satisfy the Koreans love of sporting competition.  The stadium has a capacity of 30,000 and has a plan shape of an ellipse, of length and width, 179m by 133m.  TGP was invited by Daewoos Institution of Construction Technology (DICT) to provide a full construction engineering service for the roof structure late in 2003.  The roof acts as a dome and comprises a perimeter tension ring, a central compression section and interconnecting trusses.

TGP ascertained that a three stage erection method would provide the most economical solution.  Firstly the central compression section would be assembled at ground level and lifted using strand jacks and supported temporarily on towers.  The second phase would be to install the tension ring which is supported on bearings around the perimeter of the stadium and the trusses that frame between the inner and outer sections.  Finally the central compression section supports would be removed in a jack down operation until the roof is a free-standing structure.  TGP undertook the detailed design of all the temporary works including the foundations, jacking and support towers as well as advising the contractor on erection sequences and specific support arrangements for structural sub-assemblies.  Structural analyses of the roof were undertaken for all stages of erection to check stress levels and also to establish erection tolerances and jack down operational limits.  All critical lifting and jack down operations on site are undertaken under the supervision of TGP.

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