Device for centring a manhole-cover frame and adapting the height to the road level as well as a manhole-cover fastening

摘要

To reduce road traffic noise and to cut down on public costs. To facilitate the making and maintenance of pipline inspection shafts in the area of traffic surfaces. Quicker and technically more accurate working method in the placing of asphalt layers. Reliable manhole-cover fastening releasable at any time.