Taiyo Kisokogyo. 

Taiyo Kisokogyo Co.,Ltd. is a diversified civil engineering company based in Japan. Its business operations are structured into six key divisions: specialized civil engineering, residential construction, environmental construction, general construction, machinery manufacturing and sales, and renewable energy. The company's work encompasses complex underground civil engineering tasks, such as creating continuous underground walls and clearing subterranean obstructions. It also specializes in ground improvement and installing pipelines for various critical infrastructure, including water, sewage, electricity, gas, rivers, and roads. Beyond these fundamental civil works, Taiyo Kisokogyo undertakes housing correction, building construction, and renovation projects. Their environmental efforts include soil pollution purification and harnessing underground heat. The company also manufactures and sells construction machinery and is involved in renewable energy initiatives, notably solar power generation. Established in 1958, the firm is headquartered in Nagoya, Japan.