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4.1
Connecting the inlet and venting pipes
The feed pipes will be connected at the front of the end plates. For this purpose the accordingly
perforated and labelled circular cut-outs will be detached. The feed pipes must extend into the tunnel
modules approximately 15 cm. For assuring that the water enters into the modules in a steady way, it is
essential for extensive module laying that every percolation line is equipped with its own feeding pipe.
Use the connection on the upper side of the module for the deaeration / inspection end (min.1 deaeration
/ inspection end per line).
4.2
Installation of the Infiltration Tunnel / Twin
The horizontal, flat footprint of the excavation first has to be filled with a layer of grit (approx. 80 mm, grain
size 8/16) which serves as granular sub-grade course. The Infiltration Tunnel / Twin are put on the gravel
pit and connected with each other in lines (lengthwise). The percolation tunnel is covered with a geotextile
fabric for protection. The filter fleece should overlap the end of the modules by at least 300-500 mm.
Ensure the tunnel connections have a uniform & tight fitting, with no
gaps or dead spots. The first layer is gravel 20/40 and will be used
to cover the Tunnel top edge completely. The material dug out
during construction can then be used as filler. Afterwards the
excavation will be filled steadily and in layers. The terrain of the
ground surface and substructure should be the expected load to be
prepared. If a lawn is planted on top of the percolation surface, the
system should be covered with a waterproof film or a clay layer of
approx. 100 mm, as otherwise the lawn above the percolation
system may faster dry up than the rest of the lawn.
The rotting-resistant ground fence can be used as additional load
distribution under trafficable areas.
Plan view:
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4.
Installation
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Sicker-Tunnel Twin
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