Recently，Independently developed and applied to Haishiwan Coal Mine by China Railway Construction Heavy Industry Co., Ltd.“Kiln Coal Development No”TBMSuccessfully completed the spiral downhill tunneling with small turn and large inclination angle。As the first coal enterprise in Gansu Province to introduce and useTBMHard rock tunnel boring machine，It is also the first one completed in China.R50mSmall turn，14°Coal mine constructed by downslope rectangular spiral linksTBM，“Kiln Coal Development No”Good news came in the first month of 2024.，Successfully break through the kilometer barrier。

“Kiln Coal Development No”Spiral downhill tunneling with small turning and large inclination angle

“Kiln Coal Development No”TBMApplied to the development project of the third mining area of Haishiwan Coal Mine，The project is arranged in the floor of the second coal layer.，The total length is about 5.Four kilometers。The beginning of the project，The equipment will encounter the challenge of rectangular spiral tunneling with 14 degrees downhill and 50 meters radius turning.。

For the problems encountered in the construction process“Small turn、Big downhill、There are many fault fracture zones”And other industry problems。“Kiln Coal Development No”For the first time, the ultra-small empty top distance is adopted.UType shield structure design，It takes into account the shield type.TBMHost security，Meet the requirements for small turns，It also has an open type.TBMAdvantages of small headspace，Can meet the requirement of timely support。Blind area for shield top support，The R & D technical team of China Railway Construction Heavy Industry has developed a support system with front anchor net.UType a shield structure，Shorten the empty top distance from 8 meters to 4 meters，Realize the forward movement of support，So that that construction risk is effectively reduce。

“Kiln Coal Development No”TBMOff the line

“Kiln Coal Development No”TBMSuccessfully completed rectangular spiral downhill tunneling with small turn and large inclination angle，Fully demonstrateTBMAdvantages of Roadheader in Hard Rock Roadway Construction，It also makes China Railway Construction Heavy Industries.TBMThe technical advancement and reliability of the products have been strongly verified again.。China Railway Construction Heavy Industry Co., Ltd. is committed to taking customers as the center.、“One mine, one policy”A customized approach，AtTBMProvided during tunneling“Nanny-style”Service，Solve equipment problems quickly，Ensure the operation of equipment in the whole process，Write a new chapter of cooperation and development with coal mine customers。