The roof is currently taking shape at Tottenham Hotspur’s new stadium as the club battles to get the venue finished in time for the start of the next Premier League season.
A key milestone was achieved recently following the completion of the compression ring, the final step before the stadium’s roof structure is raised into place.
The compression ring sits at the back of the four stands and creates an elliptically-shaped ring, which will hold the cable net roof structure.
After the cables have been lifted into position the roof will be covered with 287 glass roof sections and 810 cassettes.
The flying columns that are currently positioned in the stands across the stadium site will form the inner part of the roof and are connected to an upper and a lower tension ring in the centre of the roof.
The tension rings are connected back to the compression ring by 45 radial cables, which are laid out on the tiers in the bowl.
These cables have all been tightened at the same time by strand jacks (lifting jacks attached to the cables) until the roof is sufficiently tensioned to structurally support itself.
The whole process takes a number of weeks and is dependent on weather conditions.
Once in place, the roof will form the highest point of Spurs’ new home.
- The roof is made up of 287 glass roof sections and 810 roof cassettes consisting of metal and acoustic panels facing the bowl, and a membrane facing the sky;
- The structural cables on site measure a total of approximately 10km;
- When raised, the roof cable structure will weigh 600 tonnes;
- A force of 20,000 tonnes will be used to lift the roof via the tension cables;
- 54 flying columns create the support between the upper and lower tension rings;
- The roof features 324 LED sports lights, (six attached to each flying column), which form the floodlighting for the stadium.