Combined Media Crossing in detail

Combined Media Crossing as a cable crossing

Experience shows that eight, rarely up to twelve DN 110 conduits are placed in a protective steel tube under traffic routes (e.g. rail) and spare tubes (often quite a generous number) are always added. The max. nine conduits provided in Combined Media Crossing (small version) are thus sufficient for 95 % of all applications. If further conduits are required, more Media Crossings are to be arranged next to each other or the big version is to be selected.

There are also conduits without any protective steel tube in tube packages (e.g. unclassified streets). In this case, Combined Media Crossing would not be a simplification and would thus not be used. However, if protective steel tubes are required, an open type of construction with shoring or horizontal directional drilling would be needed in conventional installation. Both cases involve high costs and time. Substantial machines and logistics are required, expensive shoring work has to be provided which, in turn, has to be planned, statistically proven and approved. This is not the case for Combined Media Crossing ! Less cover permits the construction of an installation trench without shoring according to DIN 4124. Welding as well as corrosion protection measures are completely eliminated due to the reinforced concrete construction.

After the substructure of the shaft and the gravel/sand fill have been placed for non-settling installation, the tube shells are placed joint-to-joint and inserted into the special components of the cable construction shafts. Subsequently, the required conduits are placed and closed with the covers of the crossing. Attention has to be paid that the prefabricated elements interlock correctly which will result in form-closed and force-closed coherence of the crossing. Subsequently, the -again prefabricated- special components of the cable construction shaft are attached. The usual cable container system is now installed and the crossing is covered with suitable material which is then compacted.
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Combined Media Crossing as a drainage crossing

On principle, the water quantity to be transported (surface water or waste water) determines the tube diameter of a drainage crossing. Experience shows that 95 % of all crossings use a tube diameter between DN 300 and DN 500. The latter approximately corresponds to the hydraulic cross section of Combined Media Crossing which permits a wide range of applications. Since the crossing is not installed as deeply as conventional crossings a steeper longitudinal gradient as a variable is a possible hydraulic confirmation criterion. The positive side effect of less cover is a significant reduction of soil to be excavated due to higher connecting trench positions, possibly for long distances. If higher hydraulic drainage is required, further Media Crossings are placed next to each other or the big version is chosen.

The installation is the same as for the cable crossing, merely the longitudinal gradient and different canal connections have to be taken into consideration. Prefabricated slope elements can also be attached. A special feature of this application is the requirement of tightness of the facility. This can be permanently achieved by sealing joints (e.g. joint tapes, adhesive).

Media Crossing combining cable crossing and drainage crossing

Particular economic efficiency is provided by the combination of both forms of crossings. The lower part of Combined Media Crossing is used for surface water or waste water and sealed conduits are provided in the upper area for cables and lines. These are fastened by pipe brackets. In this way, it is possible to combine media crossings under traffic routes in a simple and also cost-effective manner. The installation is handled in the same way as the two options described above.
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