Polygon Tank Systems
Milton precast concrete polygon tank system is the answer to many environmental considerations over fluids storage problems, particularly where large volumes are involved. The system is suitable to store foul and surface water sewage, agricultural slurry, chemicals and similar effluent prior to their treatment and safe disposal. Special linings are available to cope with attack of the concrete from aggressive liquids.
- Proven design used successfully in Europe for several years
- Easy and quick installation
- Sizes to suit the requirements – no waste capacity
- Unique tried and tested joint assures joint integrity
- No problems with temperature or aggressive nature of fluid to be contained
- Full Milton technical back up
- Meets BS8007 and all supporting standards
Wall Specification
The precast concrete wall panels are flat sections, designed as vertical cantilevers in accordance with BS 8007, to form a plan polygonal shape to any diameter over 6.0 m and up to 6.0 m high, or a plan rectangular shape as an open tank, or with columns and a roof, which may then be landscaped. Wall panels can be designed to withstand internal loading from the retained liquid with a density of 11 kN/m², external earth loading with a density of 19 kN/m² and live load surcharge, separately or in combination. Special wall panels may be produced with holes to accommodate feed and drain pipes. An EPDM rubber seal is provided and may be factory fitted to one side joint of the panels relative to the declared direction of laying.
| Wall length – up to 3.0 metres |
| Wall thickness – 160mm – 210mm |
| Wall height – up to 6.0 metres |
| Characteristic concrete crushing strength @ 28 days – 50N/mm² |
| Units manufactured with a blend of ordinary Portland Class 52.5 cement to BS 12 with PFA to produce Sulphate Resisting Concrete to Class 4 |
| Density approx. 2380kg/m³ |
| Nominal weight per wall section 160mm thick (3m x 3m) approx. 3.5 tonnes |
Installation
Erection of the wall panels is easily achieved using a crane, while temporarily holding them in position with adjustable push-pull props until the single or double insitu concrete ring beam has been cast and sufficiently matured. A general arrangement drawing for the walls and columns and roof panels if any, peripheral insitu base and ring beam reinforcement detail and schedule and a wall layout method statement is provided, based on the particular details supplied by the customer. A similar method of erection is adopted with the columns with an insitu concrete base to be cast and grouting of the support reinforcement ducts. Roof panels locate on dowels on the top of the walls and columns, the joints grouted and the tank may then be covered with earth and backfilled.
In waste water treatment plants, launder channels may be constructed in concrete or grp, facilities provided for a full or half bridge rotor, or a lightweight roof may be fitted.