Keel of Yellow River's First Tunnel Assembled

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)