Manhole installation

A foam pad is provided with the manhole onto which the manhole will rest. When mounting legs are present on the integrated structure, foam spacers are provided for them as well. The use of the pad s is optional but recommended. Occasionally the pad will need to be removed to allow shimming of the manhole to make it level.

In general, though, the foam pad should be used whenever possible. Guidelines can be tied to the pipe stubs to help move and position the manhole into place. Only use Nylon or similar fabric slings when moving a fiberglass manhole — never use cables or chains. When moving a manhole, plan the move in advance and use slow, smooth movements to avoid overturn.

With the manhole set on the slab, it can now be secured into place. Wedge style or similar anchors are commonly used to secure the manhole. Preset cast anchor bolts are generally not recommended as they provide little leeway or flexibility if position of the manhole needs to be adjusted. Pipe stubs with flexible couplings are the most common connection type.

Here a pipe stub is laminated to the manhole or integrated structure to mate up to the line piping. A flexible coupling is provided with stainless steel clamps to seal the connection between the two pipes and make it watertight. Alternatively, lb. On very rare occasions caulking collars may be provided. Caulking collars are oversized pipe stubs into which the line piping is slid.

The annular space between the two pipes is then packed with a watertight compound or material i. The primary use for caulking collars is where off-angle piping needs to connect to the structure. Note, though, that off-angle piping is not recommended for use with flow monitoring manholes. With the fiberglass manhole set and secured, the excavation can now be backfilled. Starting under the piping connections and any portion of the structure extending outside of the manhole barrel, fill should be installed evenly around the manhole in lifts of no more than inches [ Backfill should be clean and without construction debris or materials larger than 1-inch [2.

The installation process can be completed in a matter of few minutes. This process consists of unloading the manhole, lowering it into the trench, and placing it on a clear layer of sand or aggregate. It is then connected to the installed sewer system through connections that have already been installed to it at the factory. The installation process is as follows below:.

Step 2 : Pipe Connections are sealed with our material and checked. If new pipe connection is needed or any extra work Extra line, extra coring etc.