November 25th, 8:16.，At the construction site of Baishitang Station, Phase IV of Shenzhen Metro Line 3，Along with the slow rotation of the shield cutter head，Diameter 6.44 meters“Dongjin 8”The shield machine was successfully launched.。Steel sleeve is used to start the section.，After successfully running through the low-carbon station of Shenzhen Metro Line 3~Behind the right line of Pingxi Station，Another excavation of China Railway Mountain and River“Iron Army”Help build the Great Bay Area。

The Shenzhen Metro Line 3 Extension Project undertaken by China Railway Shanhe consists of two sections.。Among，Low Carbon City Station~Baishitang Station Section is a double-track tunnel.，Interval left line length 1168.50 meters，The right line is 1148 meters long.，Maximum burial depth 17.4 meters。“Dongjin 8”The shield machine starts from Baishitang Station.，Interval needs to underpass karst development area、Pingxi Bridge、Pingxi Bridge（Box culvert）、Building buildings and factory buildings、Upper soft and lower hard strata and rivers, etc.，Finally arrived“Carbon Peak Carbon Neutralization Pilot Demonstration Area”Shenzhen International Low Carbon City--Low Carbon City Station。

“Dongjin 8”The shield machine mainly passes through sand and gravel during the tunneling process.、Silty clay、Karst cave、Highly weathered granite and slightly weathered marble，There are a large number of karst caves in the marble stratum of the interval stratum.，The surrounding environment is complex，High construction risk。In view of the construction difficulties such as intensive karst development in this project,，Before departure，The project department carries out advanced grouting reinforcement in advance、Geological radar scanning and other operations，At the same time, the shield machine is optimized.，Soil bin visualization is used in shield construction.、Automatic measurement of shield tail gap、Automatic metering of muck、Advanced technologies such as air conditioning, ventilation and refrigeration in tunnels，Carry out real-time follow-up measurement on the excavation position of the shield machine，Ensure the smooth progress of shield tunneling。

  

This section is the first section of Shenzhen Metro to start with steel sleeves.，That is, the steel sleeve starting technology is adopted.，Replace the traditional end reinforcement process，And that safety of shield construction is ensure.，But also greatly save that consumption of construction materials.，The construction cost is reduced.，Practiced green、Energy saving、Low-carbon concept。Before shield launching，The project department has invited experts to demonstrate the construction scheme.、Drawing joint review、Shield machine configuration review and construction scheme optimization consultation，Ensure the smooth completion of shield launching。

  

The shield started this time.，It marks the low-carbon city station of Shenzhen Metro Line 3 project constructed by China Railway Shanhe.~The section of Baishitang Station has formally entered the stage of shield construction of the tunnel section.。After the completion of Shenzhen Metro Line 3，It will greatly enhance the operation capacity of Shenzhen's urban rail transit.，At the same time, it will further enhance the level of economic development in the eastern part of Longgang.，Strengthen links between major groups in the east。