The three-arm rock drilling jumbo of China Railway Construction Heavy Industry Co., Ltd. accurately controls the over-excavation and under-excavation of the tunnel to help the construction of key projects

Recently，Developed by China Railway Construction Heavy IndustryZYS113GThe three-arm rock drilling jumbo has achieved remarkable results in the excavation of a tunnel on the plateau railway and the control of overbreak and underbreak.。In terms of smooth blasting effect，Blasthole scar rate 90％Above，The utilization rate of blast holes is 95％Left and right。In terms of overexcavation and underexcavation，ⅣAverage linear overbreak of Grade I surrounding rock 17～19cm；ⅢAverage linear overbreak of Grade I surrounding rock 13～14cm。Unit consumption of explosive materials，Unit consumption of hard rock double line is from 1.3kg/m³Left and right down to 1.05～1.1kg/m³；The unit consumption of single line of hard rock and soft rock is 1.3～1.5kg/m³Down to 1.1kg/m³Left and right。

On-site construction of computerized three-arm drilling jumbo of China Railway Construction Heavy Industry Co., Ltd.

Railway Construction Heavy IndustryZYS113GThe three-arm drilling jumbo has the functions of automatic precise positioning and efficient precise drilling.。Input the design parameters into the trolley computer，Trolley passes 3DRecognition of known points on tunnel arch walls by scanner，The position of the trolley relative to the tunnel can be calculated。Precise positioning and design parameters through the trolley（Line、Excavation profile、Blasting design, etc）Import of、 Calculation ，The depth of specific blast hole will be displayed in the central control platform of the trolley.、Position and angle information，The operator can operate the handle according to the display of the computer to finish the precise drilling of the blast hole.。

Tunnel section

The customer is to effectively control the over-excavation and under-excavation of the tunnel.，The precise micro-vibration cumulative blasting technology is proposed.。Among them, precision requires the drilling jumbo to drill holes accurately.，It is necessary to drill holes.“Quasi”（Hole position deviation shall not be greater than 3cm），The bottom of the gun“Qi”（The bottom of the gun should fall on the same section，The deviation shall not be greater than 10cm），Peripheral holes are required“Even”（The spacing is uniform，Hole pitch deviation shall not be greater than 5cm）And“Ping”（The holes are parallel，The fork angle should not be greater than 2°，And parallel to that centerline of the line.）。

Railway Construction Heavy IndustryZYS113GThe fully computerized three-arm rock drilling jumbo is accurate in the field.、Qi、Even、Ping，It has contributed to improving the quality of tunnel excavation for customers.。

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