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Distances
STEEL DISTANCE ELEMENTS
FOR REINFORCING OF FERROCONCRETE CONSTRUCTIONS
There are made distance washers of type "S" (corrugated) and type "A" (basket) of ribbed wire of diameter 4,0 mm and height up to 350 mm.
Upper reinforcement distance spacers according to DBV* requirements
* Deutscher Beton und Bautechnik Verein
(German Association of Concrete and Building Technology)
Edition June 2002
For linear distance spacers for upper reinforcement (spacers type A or S) acc. to requirements of DBV the allowed load is FRd=0,67kN/m.
This limitation is neccessary also because of the need to prevent unacceptable shape distortion of upper reinforcement spacers. During reinforcing works and concreting the following spacing (spread between axis of spacers) should be used:
|
Diameter of upper reinforcement wire |
Spacer spread |
| 1 |
d < 6,5 mm |
50 cm |
| 2 |
6,5 mm < d < 12,0 mm |
70 cm |
| 3 |
12,0 mm < d |
70 cm* |
* if bigger spread between axis of spacers is recommended then it should be confirmed by recalculation of load
Recommended spread between axis of spacers depending on diameter of upper reinforcement wire leads to following demand for spacers:
| Spacer spread |
Demand |
| case 1 (50 - 60 cm) |
1,0 pcs/m2 of upper reinforcement |
| case 2 (60 - 70 cm) |
0,8 pcs/m2 of upper reinforcement |
| case 3 (70 - 80 cm) |
0,7 pcs/m2 of upper reinforcement |
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