Guardian / Manhole Lid

Underground pipeline is a complex public systems, with passers-by can not know when this system go wrong, there will be much of a disaster, you can be informed in advance if a dangerous situation, avoid disaster; therefore we hope that through the "manhole cover" Come as a first defense, through manhole covers have warning sensors, emergency police and fire units and wiring message alert sound, so to solve the early warning function of underground pipes disaster, the first time to escape danger warning passers-by, with passers-by to provide first information underground line to prevent the disaster.