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Why the manhole from the top down
The main consideration is the reason for ventilation, it is closed before opening, if it is opened from the bottom up, it is difficult to open a manhole above, because there is a high concentration of toxic and harmful gases inside, opening from the top first, there is no convection, so toxic gases are not easy to come out, conducive to opening manholes, sealing manholes is the same reason.
Aug 29,2023
The main consideration is the reason for ventilation, it is closed before opening, if it is opened from the bottom up, it is difficult to open a manhole above, because there is a high concentration of toxic and harmful gases inside, opening from the top first, there is no convection, so toxic gases are not easy to come out, conducive to opening manholes, sealing manholes is the same reason.
When the tray is installed, each section is installed layer by layer from the bottom to the top, and when disassembling, it is installed from the top to the bottom. Check from bottom to top before sealing the tower, then seal the tower.
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