The filling system is used to fill rotting tunnels. A diagonally movable transfer bridge is installed upstream of the tunnel system, which picks up a filling shuttle with transport belt and moves this in front of the tunnels. The filling shuttle is able to enter an assigned tunnel and fill this in layers with the transport belt. On the top, the tunnel walls are equipped with a continuous running beam consisting of reinforced concrete on which the filling shuttle moves.
The filling shuttle picks up a diagonally movable and reversible transport belt that is equipped with a movable and reversible distribution belt on both ends. The distribution belt serves to transport the material up to the tunnel wall and set it down there. For this purpose, the corresponding distribution belt is moved to the discharge parabola of the transport belt. The material transferred on the transport belts is distributed in longitudinal and diagonal direction and on the distribution belt by the travel speed adapted to the material flow in such a way that layers with a relatively even thickness can be filled in.
The supply belt attached movably on the tunnel ceiling with automatic cover lifting device always follows the diagonal movements of the transport belt so that the material is always centrally distributed on the transport belt through the opening in the tunnel ceiling. Integral component of the supply belt is a volumetric flow rate measuring device that influences the control of the distribution function and thus the speed of the filling shuttle.
If required, the material is watered at the transfer point from the supply belt to the transport belt. The excess water is absorbed by the material in the tunnel. When filling in the material, the bottom half of the tunnel gate is closed to reduce emissions during suctioning towards the rear tunnel wall. For optimum homogenisation, the material is filled in in several horizontal layers across the entire tunnel surface until the desired fill height is reached.
Sensors record the fill height across the entire filling surface. Filling corrections are performed in the process until the specified fill height is achieved across the entire filling surface.