The Signs Point to Expansion
METRANS Rail Deutschland GmbH demonstrates foresight in the truest sense of the word. The 100% subsidiary of METRANS a.s. provides traction services for block train transports with sea containers and other loading units on the German rail network. With the paving of the container handling area in the Metrans port of Königs Wusterhausen, the rail transport company is expanding its logistics areas, and doing so under ecological aspects in the drinking water protection zone designated here.
Large area drainage with special requirements
Logistics areas, often with a size of several thousand square metres as in the Metrans port, place high demands on the design of the surfaces. It is important that the surfaces used by ground vehicles (e.g. reach stackers) are absolutely level. At the same time, a drainage system must ensure that surface water and possibly liquids from containers are safely drained off or temporarily retained in the event of an accident.
The area of approx. 7,000 m² used by METRANS is drained via two channel lines with a total length of approx. 290 m. The surface water is collected in a pump sump. Connected by a collector pipe that can be shut off and runs parallel to an infiltration trough, the surface water is led into a preliminary shaft with a pump sump. From here, the water is led into the swale. In the event of an accident, this arrangement of components makes it possible to retain any contaminated water until it is pumped out.
The structure of the swale, whose volume of approx. 50 m x 17 m and a water retention height of 55 cm was calculated on the basis of a 30-year rainfall event, meets the requirements of ecological rainwater management. Drainage pipes with a gradient, enclosed by a gravel pack with a cover of 20 cm, channel the water into a ditch that opens into the Notte Canal. The 30 cm thick topsoil layer above the gravel pack serves as a revitalised soil zone through which the water trickles/seeps away and binds pollutants carried along in the soil. An emergency overflow, which is also connected to the trench, protects the swale from flooding during extreme rainfall events.
The system HYDROblock® in the nominal width 300 mm is optimally suited for heavy-duty areas.
The drainage channel enables tight installation with the integrated NBR socket seal.
Heavy duty ductile cast channel
The decisive factor for dispensing with conventional, underground cleaning systems for surface water treatment is the unfavourable subsoil found in the port area of Königs Wusterhausen, which has a high settlement potential. Taking into account the previously described requirements for the drainage system, the planners decided to use drainage channels of the type HYDROblock® DN 300 with an inlet cross-section of 1,191 cm²/m. The installation of this drainage system is advantageous not only in terms of the monolithic construction. Due to the material EN-GJS-500 (ductile cast iron), it also offers significant advantages over other materials in terms of material fatigue, especially in the heavy load range.