Ando Hazama and Nishio T&M (Takatsuki City, Osaka Prefecture, President: Shunsuke Kita) have jointly developed automatic shotcrete construction technology to improve productivity and safety in mountain tunnel construction. This is achieved by introducing three programs: ▽ Face profile collection, position information calculation processing, and hydraulic control. Operators can automatically execute shotcrete by operating a tablet attached to the sprayer. It is expected to be applied to the mountain tunnel site built by Ando Hazama in 2024.
Demonstration state in the simulated tunnel (from press release material)
Demonstration using a simulated tunnel. It was confirmed that a series of functions such as calculation of the required amount of shotcrete, automatic construction and determination of thickness after construction all worked as expected.
Of the three programs that make up the new technology, the surface finish acquisition program calculates the required amount of shotcrete based on 3D surface data captured by a LiDAR mounted in front of the sprayer. The thickness of the shotcrete is determined from the difference between the 3D data before and after construction and the finished form is confirmed.
The processing program calculates the location information to select the sprayed concrete construction area from the 3D data obtained from the surface finish shape acquisition program and calculates the nozzle route for automatic construction. Furthermore, the target position of the nozzle head is determined, and the angle and position of the nozzle are controlled.
The hydraulic control program determines the sprayable range based on the position information of the nozzle determined by the position information calculation processing program and realizes the hydraulic control of the spray robot. By adding a proportional solenoid valve to the hydraulic circuit of the sprayer and changing the output power from the controller, the speed and stroke of the actuator, which converts energy into mechanical translational or rotary motion, will be controlled.
Hazama Ando is currently promoting the development of the ``Mountain Tunnel Integrated Management System (i-NATM),'' which uses IT to significantly increase the productivity and safety of mountain tunnel construction. The company aims to build completely unmanned mountain tunnels in the future.
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