Glory reappears! "Jinghua" helps the first tunnel of Beijing East Sixth Ring Road reconstruction project run through smoothly.

The other day，Beijing East Sixth Ring Road Reconstruction Project Reported Good News Again，Jointly built by China Railway Construction Heavy Industry and China Railway 14th Bureau“Jinghua”Shield Machine successfully completed the receiving of intermediate air shaft，Help the first section of the tunnel through，It marks a phased victory in the reconstruction of the East Sixth Ring Road in Beijing.。

“Jinghua”The maximum excavation diameter of the Shield Machine is 16..07 meters，The whole machine is 150 meters long.，Total weight 4300 tons。The Shield Machine adopts the fourth generation of constant pressure cutter changing technology.、Retractable main drive、Ultra-high pressure automatic compensation、High-power slurry circulation system、A series of targeted optimization design and system integration, such as synchronous double-liquid grouting。Successful Application of Synchronous Two-shot Grouting Technology，The millimeter-level control of land subsidence is realized.，It ensures zero disturbance of shield construction to the existing buildings on the ground.，It fills in the blank of synchronous double-liquid grouting of super-large diameter slurry shield tunnel in China.。

The shield tunnel of Beijing East Sixth Ring Road Reconstruction Project is 7338 meters long.，Need to cross the sand、Water-rich and highly compact sand layer、Complex geology such as silty soil and cohesive soil alternating layer，The project is facing super-large diameter.、Very long distance、Ultra-deep covering soil、Construction difficulties such as ultra-sensitive environment。

Since the start，The shield machine has successfully excavated 4772 meters.，After 16 months, it reached the middle air shaft smoothly.。The shield machine has successively conquered the shallow covering soil.、Technical problems such as long-distance crossing of highly dense sand layers，Microsedimentation、Undisturbed continuous crossing of Beijing-Harbin Railway、Risk sources such as the comprehensive transportation hub of Beijing's urban sub-center，And created a single month footage of 542 meters of excavation record.。

It is reported that，“Jinghua”The shield machine will be inspected and maintained in the middle air shaft.，Carry out secondary initiation，Continue forward excavation 2.6km to the receiving well on the south side of Wansheng South Street，Finally, the whole tunnel will be completed.。

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