Double-long slabs
In projects with shorter spans, SL-decks can be produced as double-long or tripple-long units. This is a very cost-efficient solution significantly cutting installation time and costs by reducing the number of crane lifts by 50-89% compared to traditional 1.2-meter wide slabs.
E.g. in a project with spans of 6 meter, double-long SL-decks are delivered as 12-meter long elements spanning over 2 apartment units. The slab is supported by a load-bearing wall on the middle.
Double-long slab installation
In double-long and tripple-long SL-decks, the lightweight concrete is omitted in the cross-section over the middle support member creating a zone of solid concrete. This enables forces from walls to pass through the slab.
In terms of sound, the solid zone of concrete works just like a traditional joint, thus preventing sound from traveling between dwellings.
Reduction in pieces and crane lifts
| SL-deck – 2.4-meter version |
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| Category | Single span SL |
Traditional slab | Double-long SL |
Traditional slab | Tripple-long SL |
Traditional slab |
| Number of pieces/lifts | 1 | 2 | 1 | 4 | 1 | 6 |
| Reduction in crane lifts | -50% | -75% | -83% | |||
*Comparison made between SL-decks of different variations with traditional 1.2-meter wide prestressed slabs
| SL-deck – 3.0-meter version |
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| Category | Single span SL |
Traditional slab | Double-long SL |
Traditional slab | Tripple-long SL |
Traditional slab |
| Number of pieces/lifts | 1 | 2.5 | 1 | 5 | 1 | 7.5 |
| Reduction in crane lifts | -60% | -80% | -87% | |||
*Comparison made between SL-decks of different variations with traditional 1.2-meter wide prestressed slabs
| SL-deck 3.6-meter version |
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| Category | Single span SL |
Traditional slab | Double-long SL |
Traditional slab | Tripple-long SL |
Traditional slab |
| Number of pieces/lifts | 1 | 3 | 1 | 6 | 1 | 9 |
| Reduction in crane lifts | -67% | -83% | -89% | |||
*Comparison made between SL-decks of different variations with traditional 1.2-meter wide prestressed slabs
