Temporary overlays for Tokyo 2020 included not only simple structures such as tents, prefabricated buildings, and seats, but also buildings with heavy steel frames, light towers, and extensive utility work.
Temporary overlays were constructed in all 85 venues, including existing, new and temporary competition venues, across ten prefectures. A large number of parties were involved in the construction of the overlays, including different areas of the OCOG, the IOC, sports associations, venue owners and administrators, and local municipal entities.
To manage this challenging set of projects and help manage costs, the OCOG put in place a number of strategies:
- Use of design-build contracts (including demolition, removal, and restoration) to reduce the number of involved parties and associated change orders. However, separate procurements were conducted where the scale and characteristics were particularly challenging for the market, for example temporary seating.
- Where possible, overlays for multiple venues were procured together as a cluster to facilitate construction schedule control and achieve economies of scale.
- The OCOG set standard specifications for elements that would be commonly procured, such as tents and security fences.
- The implementation of coordination mechanisms such as an Overlay Book, which compiled the plans for all venues and was updated every six months, and a Venue Integration Group, which managed the progress of planning and construction and maintained a consolidated construction schedule.
Source: Tokyo Organising Committee of the Olympic and Paralymic Games