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Cut and cover construction
Definition of Tunnel waterproofing systems with increasing waterproofing requirements.
In difference to the mining technique of a tunnel, the cut-and-cover method takes place in the open underground. The tunnel geomembrane is placed loosely on the protection geotextile, which is installed first onto the sealing carrier layer (construction concrete)
and which must be smooth and free of cavities and ridges. A second protection geotextile is placed (also loosely) on top of the tunnel geomembrane.
| No. (acc. to increasig sealing requirements) | Hydrostatic pressure (m) | Waterproofing-membrane System | Sealingsystem (Water corrision class, XA-class) | Additional requirements | ||
|---|---|---|---|---|---|---|
| low, moderate XA1, XA2 | high, XA3 | Waterstops (inside or outside installation) | Integrated Injektion-system | |||
| 1 | without | - | watertight concrete | - | yes | no |
| 2 | without | umbrella | Geomembrane 3mm | - | no | no |
| 3 | without | all around 360° | - | Geomembrane 3mm | no | no |
| 4 | <30 | - | watertight concrete | - | yes | no |
| 5 | <30 | all around 360° | - | watertight concrete + Geomembrane 3mm | yes | no |
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