What is the innovative front for the design of a manhole?
Over the years there have been attempts at innovation, some successful, others less so: when cast iron became a precious material the way of wood was tried but it presented too many limits of use.
Today we are experimenting with the construction with composite material which could be a good promising. But as long as the cast iron holds up, I doubt there will be a real competitor validated on all fronts.
In this sense Iacchetti and Ragni (who edited the preface of the book, ed) are a clear example of how there is room for innovation on the subject: they were really good at introducing a new form of the same original material (ductile iron). The cast iron particles in this new form are arranged in an intertwined way: the thickness decreases and the weight consequently, making it cheaper to transport.
Research is being carried out: in Australia they seem to have invented an alternative instrument, a basin under the drainer that collects polluting materials, preventing them from falling into the sewer channel and then into the sea. However, it is always increases to the object itself which remains in its virgin nature and true to itself.
A gem
At the end of the reading, the list of all classified manholes is accompanied by the house number and geolocation references.