The First Tunnel Excavated by Non-blasting in Dalian

Guangming Road Tunnel Project

Five cantilever tunnel boring machines of XCMG

Ongoing“Operation Rock Breaking”Relay race

Hard teethVSHard rock sparks fly

  

Dalian Guangming Road Tunnel belongs to large section.、Small clear distance、Shallow cover tunnel，The stress condition of the structure is complex.，There are karst caves in some areas.，It also passes through the urban living area and the petrochemical industrial area.，And relate to a chemical plant、Gas pipeline and other units，The construction stratum needs very little disturbance.。

Construction of Guangming Road Tunnel by Step Method，Go、Milling and excavation construction of cantilever tunnel boring machine for lower bench，After the cantilever tunnel boring machine excavates a section,，Subsequent work teams erected steel arches in the tunnel.、Laying of reinforcement、Shotcrete，To fix the mountain。

  

In the Guangming Road Tunnel，Five XCMG cantilever tunnel boring machines are arranged on the east and west lines respectively.，Simultaneous construction operations。

The whole construction is continuously pushed forward by cutting the wall rock at a high speed through the cutting head.，Image of XCMG roadheader“Mecha beast”Generally, use the foremost toothed disc to gnaw the rock little by little.。At the same time，A circle of spray nozzles hidden at the rear end of the cutting head of the roadheader，It automatically sprays water mist，Reduce dust and debris of soil and rock，Cool down the machine，It also improves the working environment.，Safeguard the health of operating personnel。

  

XCMG boom-type roadheader has less disturbance to the stratum.，On the basis of flexibility, it has the advantages of hard rock excavation.，Ensure construction safety，And that efficiency is high、The cost is controllable，The pressure of tight construction period is greatly relieved.。

The project manager said：

“XCMG boom-type roadheaderIt will not produce as much impact as blasting.，Little damage to surrounding rock，Almost no relaxation occur、Drop block，The risk of collapse is minimal.，And that safety of the work face is greatly improved.，At the same time, the surrounding buildings will not be affected by the blasting vibration.，This is a great help to the construction.。”

 

With the help of XCMG cantilever tunnel boring machine，On average, each working face advances 1 per day..5 to 2 meters。As of mid-September this year，The construction of Guangming Road Extension Project is progressing smoothly in all areas.，The excavation of Guangming Road Tunnel has exceeded 1300 meters.，90% of the total%。The entire Guangming Road Tunnel is expected to be completed smoothly in early October this year.，2 months ahead of schedule。