Jointing to pipeline
To allow for any differential settlement between manhole and pipeline, short “butt” pipes, either spigot or socket, should be built into the manhole wall so that a flexible joint is incorporated as close as possible to the outside of the manhole or the concrete surround if used. Depending on ground conditions, short length pipes (rockers) then connect these butt pipes to the incoming pipe runs. Additional care must be taken to ensure that the joints are properly made.
Manholes can be jointed quickly and easily with a rubber bitumen compound such as Tok Strip or other approved sealant providing a watertight seal without the use of a concrete surround.
Reducing construction time and resources required on site is a continual challenge and opportunity to manufacturers and distributors. JDP strive to be involved in the latest advances in new and existing materials and technologies which offer engineers solutions.
|Code||Unit Nominal Size (mm)||Sealant Length (per joint)||Sealant Size||Primer|
|08206X50X6LS||600 x 450||2.5m||6mm x 50mm||5 litres per 100m|
|08206X50X6LS||750 x 600||3.0m||6mm x 50mm||5 litres per 100m|
|082012X60X6LS||1000x 675||3.5m||12mm x 60mm||5 litres per 75m|
|082012X60X6LS||1200 x 750||4.5m||12mm x 60mm||5 litres per 75m|
This section describes the recommended procedure for the installation of precast concrete manholes.
- Place the bottom unit with either integral precast, or insitu concrete base.
- Erect the required number of standard components and seal the joints as appropriate all in accordance with the design.
- Place a reinforced concrete cover slab on top.
- If required place a corbel slab then add the appropriate number of adjusting units.
- Fit the manhole top for access from ground level.