Project Name: Chunfeng Tunnel, Shenzhen, China

Construction Unit: China Railway Tunnel Group Co., Ltd

Equipment number: 588 'Spring Breeze' China Railway Equipment

Blade diameter: 15.8m

Excavation length: approximately 3.6km

Project features:

1. Crossing through numerous buildings and structures, passing through multiple risk sources such as pipelines, bridges, subway lines 1 and 9, and high-rise buildings, with a maximum burial depth of 49 meters.

2. Crossing geological 'complex' formations, with soft upper and hard lower layers and hard rock formations, of which the hard rock section accounts for more than 80% of the excavated strata, distributed in 11 fault zones.

3. The turning radius of the shield tunnel is 'small', with a minimum horizontal curve radius of 750 meters.

Starting year: May 2021

Completion year: December 2022