GENERAL INSTRUCTIONS FOR INSTALLING CHAMBERS:
The general dimensions of the excavation should be at least 300mm wider than each side of the FRP chamber. These dimensions should enable secure access for connection of pipes, back filling and compaction with appropriate equipment.
Place the FRP chambers on the prepared compacted PCC bed and connect inlet pipes and outlet pipes.
The back filling should be carried out in accordance with the rules of good practice, in successive compacted layers of 300mm. Back fill can be done appropriate to the application, ensuring it is free from stones greater than 40mm, lumps of clay greater than 100mm, timber or other material for sound compaction.
The appropriate height of bricks/concrete seating bed (150mm thick PCC) to be laid or a concrete ring can be used to the required height prior to the positioning of the FRP frame and cover. Make sure the frame will be supported completely on the Concrete bed and no gaps at the bottom to avoid any load pressure on the walls of FRP Chambers
Use appropriate capacity of Manhole Covers to distribute load away from FRP Chamber