(57) The idea of the Twist Manhole has its origins in the need of solving one of the problems
that arise during the execution of works regarding the restoration of road surfaces.
In fact, when a road is rebuilt, the finished level of the road surface matches the
level of the manhole's top surface. Later, when intervention works are going to be
made on the restoration works of the existing asphalt surface with the installation
of an additional layer, because the height of manholes currently in the market can
only be modified by carrying out construction work, it happens that the same ones
are being left the same in order to avoid the need of carrying put further construction
works around the manhole. The Twist Manhole has been designed to address this specific
issue. In fact, with a simple twisting movement, clockwise or counterclockwise, and
thanks to a four-armed tool, it is possible to increase or reduce the height of the
manhole itself.
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