“Beishan 1”Downline video

September fourth，The world's first large-slope spiral tunnel boring machine, jointly built by China Railway Construction Heavy Industry and China Railway 18th Bureau, was launched in Changsha Second Industrial Park of China Railway Construction Heavy Industry.，The excavation diameter of the equipment is 7.03 meters，The whole machine is about 100 meters long.，Capable of achieving a horizontal turning radius of 200 meters、At the same time, spiral tunneling with a vertical curve radius of 380 meters，It will undertake the excavation task of the ramp of the main project of Beishan Underground Laboratory in China.。

Li Chengcheng, deputy general manager of China Uranium Industry Co., Ltd., delivered a speech and announced that the equipment was offline.

Vice President of Beijing Institute of Geology of Nuclear Industry、Speech by Wang Ju, Chief Designer of China Beishan Underground Laboratory Project

  

Speech by Lei Jun, General Manager of China Railway 18th Bureau

  

Deputy Secretary of the Party Committee of Railway Construction Heavy Industry、Director、Executive General Manager Zhao Hui delivered a speech.

  

Deputy Secretary of the Party Committee of Railway Construction Heavy Industry、Director、He Yongjun, chairman of the trade union, presided over the offline ceremony

This roadheader is named“Beishan 1”，The equipment needs to excavate a spiral curve ramp in the Beishan underground laboratory.，Clockwise spiral excavation from the surface downward，The combined slope is 10%，It is equivalent to every 10 meters of tunnel excavation.，Height drop 1 meter。

It is understood that，North hill underground laboratory slope about 7.2 km，It is the first ramp project constructed by full-face rock tunnel boring machine in the world.，In the construction, it is necessary to solve the problem of spiral small turn tunneling in the continuous large slope tunnel.；At the same time, the engineering geology is dominated by complete granite.，Quartz content up to 25%-30%，The maximum saturated uniaxial compressive strength of rock is up to 230 MPa.，It belongs to extremely hard rock geology with great difficulty in construction.。

  

The world's first steep spiral tunnel boring machine“Beishan 1”An overhead view

For extremely hard rock faced by the project、Construction Characteristics of Spiral Tunneling in Large Slope，“Beishan 1”The development team has carried out targeted design.，It provides technical equipment solutions for rapid construction of engineering ramp。

Introduction of R & D personnel of China Railway Construction Heavy Industry，The cutterhead is equivalent to the iron teeth and steel teeth of the roadheader.，“Beishan 1”Extremely hard rock cutter head design，A free surface is for between that cutter head and the hob;，Compared with the traditional plane cutter head, the rock breaking efficiency is improved by 3 times.，Can meet that construction requirement of extremely hard rock；In order to increase the flexibility of the spiral turning of the roadheader on a steep slope,，The development team improved the spatial structure of the mainframe system.，In addition, advanced guidance、Direction control warning、Automatic cruise system for assist driving，So that that tunnel machine has the tunneling capability of a spiral curve with a large gradient。

  

The world's first steep spiral tunnel boring machine“Beishan 1”Offline site

Beishan Underground Laboratory in China“The 13th Five-Year Plan”National key projects planned for the period，The spiral ramp of the main project is constructed by the 18th Bureau of China Railway.。“Beishan 1”Off the line smoothly，It marks that Beishan Underground Laboratory is about to enter the rapid construction stage of ramp.，It will strongly boost the construction progress of Beishan Underground Laboratory.。