Manhole options
Dual containment manholes provide many additional options for configuration. This brings challenges for the design engineer. Drainage manhole suppliers can help you choose the most effective configuration for your application. Manholes can be used as an extended annular space providing several leak detection options. This configuration also provides for valve containment. Often the carrier pipe from double wall piping will continue through the manhole itself. This allows piping systems equipment, such as flow control and measurement devices, to be installed in double wall piping inside the containment itself.
When heavy manholes are installed in roads or areas subject to vehicular traffic, a concrete pad which rests on the soil surrounding the manhole is required. The pad should be designed to disperse the live load into the soil.
Nylon slings can be used to unload manholes from trucks. A fork lift, boom truck or backhole can be used. Match the weight and size of the manhole with the lifting capabilities of the equipment. A timber beam can be used inside the manhole between inlets and outlets for easy lifting. Lifting lugs can be fabricated on the manhole when requested.