The keel frame of the shield section of China's first tunnel across the Yellow River was recently completed in Jinan, capital of Shandong province.
The 4.92-meter long frame was welded in the processing area and transported to the engineering site for assembly after reinforcement and rust-proofing.
As the welding was done before the frame entered the tunnel, pollution produced during welding was avoided.
The project is contracted by Electrification Engineering Co., Ltd of China Railway 14th Group, a subsidiary of China Railway Construction Corporation Limited.
A view of the keel frame in China's first tunnel across the Yellow River in Jinan, Shandong province [Photo/sasac.gov.cn]
Workers carry out engineering in the tunnel. [Photo/sasac.gov.cn]
A worker welds the keel frame of China's first tunnel across the Yellow River. [Photo/sasac.gov.cn]
Two workers install the assembled keel frame in China's first tunnel across the Yellow River. [Photo/sasac.gov.cn]
(Executive editor: Wang Ruoting)
