Full-scale performance tests were conducted with respect to the exterior curtain walls’ wind pressure resistance, water tightness, and inside and outside deformation.

A full-sized mock-up of the exterior curtain wall was created for design verification purposes.

Aluminum thermal spraying and sealing were used to create joints that were as strong as high-strength steel frame members with the large sections. This was an efficient method where aluminum was sprayed on the joints’ friction surfaces to create a high slip factor (it was improved from 0.45 to 0.70).

Since exterior diaphragms with high-strength steel materials were used, full-sized pillar joints were created in advance, and weldability and inspection methods were verified with various steel frame manufacturers to assure high quality.

Waterproof walls necessary for the construction were also used as bearing piles for the building’s periphery. This is an environmentally-friendly method that recycles about 40% of the excavated soil in the original position. This method was also used to construct strong wall piles that were mixed with cement to improve the strength. A load test was performed at the original position.