Abstract: Shenzhen Ping’an Financial Center Building is supported by extralarge diameter manually excavated caissons. The foundation has a total of sixteen (16) caissons with a diameter of 5.7 meters and a total of eight (8) caissons with a diameter of 8.0 meters. The minimum distance between Shenzhen Ping’an Financial Center Building and Subway No. 1 Line is only 17 meters. A large quantity of concrete is required for a single caisson and concreting conditions are complicated. No previous concreting experience could be found for the similar diameter caissons. Based on the site construction conditions, the proposed concreting platform design was optimized. This paper presents the concreting methods for the extralarge diameter caissons. These methods include appropriate concrete mix design, quality control for cement and aggregate, construction quality control and temperature monitoring. The results indicated that all twentyfour (24) extralarge diameter caissons are Class I caissons.

Key words: underground construction projects, manually excavated caissons, extra-large diameter caissons, mass concrete, temperature monitoring