Flexible Jointed Pipes
Milton offer an extensive range of precast concrete flexible jointed pipes from DN 225 to DN 1800 including bends, junctions and fittings.
Pipe weights and dimensions BS 5911-1:2002 class 120
| Nominal size | A | B | C | Approx weight of pipe | Joint type | Angular deflection | ||
|---|---|---|---|---|---|---|---|---|
| DN | m | mm | mm | kg | 'G' ring | Integral | Lamell | degress |
| 225 | 1.25 | 380 | 305 | 122 |  |
2.9 | ||
| 300 | 1.25 | 497 | 410 | 217 | |
|
2.4 | |
| 300 | 2 | 497 | 410 | 334 | |
2.4 | ||
| 375 | 2.5 | 570 | 490 | 510 | |
|
1.9 | |
| 450 | 2.5 | 675 | 575 | 720 | |
|
1.6 | |
| 525 | 2.5 | 760 | 670 | 915 | |
|
1.4 | |
| 600 | 2.5 | 840 | 770 | 1210 | |
|
1.2 | |
| 675 | 2.5 | 980 | 820 | 1235 | |
1.05 | ||
| 750 | 2.5 | 1060 | 910 | 1440 | |
|
0.95 | |
| 750(u) | 2.5 | 1060 | 980 | 1997 | |
0.95 | ||
| 825 | 2.5 | 1060 | 910 | 1440 | |
|
0.95 | |
| 825 | 2.5 | 1143 | 985 | 1620 | |
|
0.9 | |
| 900(u) | 2.5 | 1235 | 1190 | 2991 | |
0.8 | ||
| 1050 | 2.5 | 1455 | 1260 | 2750 | |
|
0.7 | |
| 1125+ | 2.5 | 1545 | 1345 | 3130 | |
0.65 | ||
| 1200 | 2.5 | 1600 | 1440 | 3440 | |
|
0.6 | |
| 1350 | 2.5 | 1840 | 1620 | 4600 | |
0.53 | ||
| 1500* | 2.5 | 1810 | 1810 | 5230 | |
|
0.48 | |
| 1600* | 2.5 | 1920 | 1920 | 5702 | |
|
0.44 | |
| 1800* | 2.5 | 2160 | 2160 | 7150 | |
|
0.4 | |
Tabled dimensions are for guidance only. For accurate dimensions and weights, contact the Technical Department, as these may vary.
Notes:
1. All dimension are approximate and change due to the implementation of the Harmonised European Standard.
2. Joint rings and integral seals are normally SBR complying with BS EN 681-1:1996. Other compounds such as Nitrile or EPDM can be supplied but may not be available from stock.
3. * Pipes supplied with an in wall joint – no bell socket (full flexibility at joint maintained).
4. Milton specialised Flexilift system for handling/jointing purposes for pipes DN 1200 to DN 1800 is available on request.
5. Lorries with crane offload facilities are available for pipes up to DN 1200 upon request, although site assistance would be required on certain diameters.
6. When ordering pipes which may have to joint with pipes already on site or previously laid, particularly extensions to contracts, it is important to advise the sales office accordingly in order to eradicate any jointing problems.
7. Flexible jointed concrete pipes can be supplied with perforations.
8. + Non kitemarked.
9. (U) denotes unreinforced
Short length and rocker pipes
To allow for any differential settlement between manhole and pipeline, short lengths of either spigot/socket butt pipes should be built into the manhole wall. A rocker pipe should then be laid connecting the short spigot/socket butt pipe to the incoming/outgoing pipe run, thereby incorporating a flexible joint close to the manhole.
Short length pipes (spigot or socket butts)
Rocker pipes (joint both ends)
Junctions
Branches can be made from drainage materials other than concrete and are normally fitted to both full length and short length pipes to suit customer requirements.
Uni junctions
Uni junctions are supplied fitted to rocker pipes in DN300 and full length pipes up to DN 1800. The uni junction is produced by inserting a rubber gasket to BS EN 681-1:1996 into the main pipe at the factory, providing a watertight seal for the branch connection.
- Less susceptible to site and transport damage
- Able to accommodate a range of pipe materials using adaptors
- Angular connections can be made by using bends
The uni junction is designed to suit 150mm slimline clay pipes. To connect to plastic pipes, an adaptor coupling from the clay to the plastic pipe will be required. Alternatively for certain plastic pipes an adaptor bush is available. Contact our Sales office for full compatibility details.
Side entry manholes:
Ideal where traditional manhole construction is not possible. Fabricated from standard pipes/chamber rings into single unit. For full details please contact our Technical or Sales Department.
Ovoid flexible pipes
Milton offer a range of flexible jointed ovoid pipes for use in both foul and surface water applications. The ovoid pipe is designed, manufactured and tested in accordance with the requirements of the European Standard (Class 150).
The ovoid pipe has better velocity characteristics at low flows than equivalent circular pipes, which provides:
- Lower operating costs
- Better self cleansing velocity and therefore less risk of siltation and blockage
- Reduced costs of trench excavation resulting from shallower gradients
| Nominal internal size | Effective length | Approx weight | Handling and jointing | |
|---|---|---|---|---|
| width mm | height mm | mm | kg's | |
| 400 | 600 | 1250 | 910 | 'C' hook |
| 600 | 900 | 2500 | 2170 | Flexilift |
| 800 | 1200 | 2500 | 3300 | Flexilift |
Handling
1. Avoid damage when handling, especially to ends of concrete pipes, and never drag or roll pipes.
2. Always use correct craneage with purpose built lifting device. If ordered, large diameter pipes incorporate lift pins for which the propriety head link and chain is required (i.e. Flexi lift).
3. Joint rings must be stored away from sunlight, heat or possible contact with any oils. Stack pipes on even ground on timbers to protect sockets and spigots, making sure the bottom row is securely chocked.
Using 'Flexilift' lifting/jointing chains Available for DN1200 pipes and above
1. Use the equal length chains C1 and C2 for lifting and placing each pipe in the trench.
2. Connect the longer length chain, C3, to the pipe already laid and place the shorter length chain, C2 on the hook provided.
3. The pipe can then be jointed without moving the jib of the crane.