Recently，Domestic application of the largest diameter double shieldTBMOffline in Changsha No.1 Industrial Park of Railway Construction Heavy Industry，Section 2 of Shenhui Intercity Railway will be put into operation soon（Five and-Pingdi）Tunnel construction in the first work area of civil engineering。

Domestic application of the largest diameter double shieldTBMFactory acceptance

ThisTBMExcavation diameter 9.13 meters，The total length is about 120m，The total weight is about 1500 tons。The equipment mainly passes through slightly weathered、Moderately weathered granite，Surrounding rock withⅢ、ⅣStrata dominated by surrounding rock，Locally there are small fault fracture zones.，Maximum saturated uniaxial compressive strength: 131 MPa。The tunneling length is about 5 km.，Buried depth: 50m-100 meters。　　

In view of the geological characteristics of the project，The R & D team of China Railway Construction Heavy Industry has deeply studied the design and construction cases of large-diameter hard rock roadheader at home and abroad.，And actively communicate with the construction unit，Successfully completed the domestic application of the largest diameter double shieldTBMDesign and manufacture of。ThisTBMTargeted configuration of high structural strength、Hard rock cutter head with high wear resistance and main drive system with high reliability and long service life，O as to cope with the working condition of ultra-long distance tunneling.。The advanced drilling rig system carried by it、Belt muck weighing system、Intelligent grouting system、Air refrigeration system and other key technologies，ForTBMFast and safe tunneling provides a strong guarantee.。

It is reported that，After the completion of the Shenzhen-Huizhou Intercity Railway Project, it will effectively promote the Shenzhen metropolitan area.“Five vertical and four horizontal”Intercity network construction，Yeah, build“The Greater Bay Area on Track”、Integration of Shenzhen, Dongguan and Huizhou、Accelerate the construction of interconnected transportation pattern in the Greater Bay Area， Driving the growth engine in the eastern part of the Pearl River Delta is of great significance.。