Τοποθέτηση & Συντήρηση Καλυμμάτων Φρεατίων

INSTALLATION AND MAINTENANCE

Manhole tops or gully tops have not eternal life, and like anyone item subject to wear and tear has a durability limit, especially if installed in higly stressed traffic areas. For this reason it is advised to keep under control the ones which are more exposed to wear, and replace the old ones and those not anymore in conformity to the norm.

1. Be sure that the bearing area of the shaft is integral and clean, roughening it to improve the grip of the cement mortar.

2. Distribute the mortar bed (having a minimum compressive strength of hardened mortar of Rck 350) with thickness from 1 to 4 cm in order to obtain a smooth and regular surface.

3. Place the frame on the mortar bed, centering the clear opening of the shaft and pressing it down for firm fixing.

4. Check that the upper edge of the frame is at the same level of road pavement: if it is necessary to pack, use materials with high compression and lasting strength (such as cast iron, iron or concrete) and compatible with used installation materials; do not use small pieces of bricks or tiles or pieces of wood.

5. Cover properly the extremities of the frame (using, if necessary, iron reinforcement); fill up empty spaces between the frame and the mortar bed using the same material.

6. The mortar surfaces have to be smoothened and uniform in order to avoid penetrations.

7. Clean accurately the inner side of the manhole or gully top and particularly the contact surfaces of the frame and the cover/grating: for not compromising correct installation, the cover/grating should be inserted in the frame after that the cement is hardened using, if possible, a mechanical lifting device.

8. The filling up around the manhole or gully top has not to be carried out before three hours and using the material and/or bituminous materials or expanded concrete.

9. Before making trafficable the manhole or gully top wait and respect the cement (or other material) aging time indicated by the manufacturer.