The “Enlarger Slab” was developed for three reasons:
- It doubles the use of the existing prefabricated base thus providing considerable saving in cost.
- In a normal 1000mm diameter base it is not good practice to have more than two junctions as it leaves very little room for a man to stand. This is no problem when using an enlarger slab as there is a working platform all the way round. This means that it is now possible to have all the junctions in one manhole, giving a further saving in cost.
- The mass of a 1250mm diameter base would be very difficult to handle.
The Enlarger Slab is bonded to the base by any appropriate epoxy thus providing an indestructible and watertight joint between the