Recently, the jointly built by China Railway 17th Bureau and CRCHI, the earth pressure/TBM double-mode boring machine successfully completed the left line of Dailing Tunnel. This tunnel is part of the Fuzhou Binhai Expressway, and is the first tunnel completed for the Fuzhou Binhai Expressway project, marking a good start to the construction of the project.  

The total length of the Dailing Tunnel is 1488m, and the tunnel section has both soft soil and extreme hard rock ground, of which the maximum compressive strength is 200MPa. To adapt to complex changes in geology, the equipment has both earth pressure mode and TBM mode and can not only meet the needs of rapid long-distance tunnelling of hard rock, but also meet the tunnelling requirements of complex strata including soft soil, soft rock and upper soft and lower hard rock. After simple component adjustment, the flexible switching of the two modes can be quickly completed, and the equipment input cost is greatly reduced.  

The dual mode TBM EPB started underneath pass structures such as foreign language school and existing railway line. After an excavation of more than 100 m, the equipment entered a section of hard rock. The transformation of EPB mode to TBM mode was completed safely and quickly. The maximum daily footage has been 27m, and the maximum monthly footage is 389m. Visit http://en.crchi.com. 28/21.