Trenchless manned installation of wastewater pipes and sewers using open controllable shields without compressed air or manned installationbased on mining construction techniques. A limitation to mining construction techniques is stated on the award certificate.

Quality mark holders of group VOD also meet the requirements of group VO.

Trenchless manned installation of wastewater pipes and sewers with open controllable shields without compressed air or manned installation using mining methods.

 

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Trenchless installation of wastewater pipes and sewers using enclosed controllable shields and support of the heading face through liquid using compressed air or earth pressure (e.g. mix or EPB shield).

Quality mark holders of group VMD also meet the requirements of group VM.