Detalhes do Projeto

BYPASS TO ALCÁCER DO SAL – 2ND PHASE
RAILWAY CROSSING OF SADO AND ACCESS VIADUCTS
FOUNDATIONS WITH PILES

Client: REFER – Rede Ferroviária Nacional, E.P.
Location: Alcácer do Sal – Portugal
Execution Period: 13 Months

Execution of 42 Ø 2.000 mm bored piles, in the bridge piers with definitive metallic casing or simultaneous use of metallic casing and stabilisation of the hole’s walls using bentonite slurry below the metallic casing: average yield of the concreted pile of approximately 4 units / week and 2 units / week, respectively, considering an average drilling yield of roughly 44 m per day;
Metallic casing Ø 2000 mm used: 1.400 ml of metallic casing with lengths comprised between 23,5 m and 49 m;
Execution of bored piles with recoverable metal casing; 41 units Ø 1200 mm, 192 units Ø 1500 mm with yield of 34 m/day;
Execution of bored piles with definitive metallic casing; 64 units of Ø 1500 mm, application of 1.378 m of Ø 1500 mm metallic casing with lengths comprised between 15 m and 33 m;
Execution of 18 cofferdams for the construction of the viaduct piers footings and 4 cofferdams for the bridge piers footing using vibro-driven metallic sheet piles and execution of a bottom plug;

Crossed geology (strata thickness):
Mud and muddy sand: 17 m (P1) to 30 m (P2);
Fine to coarse sand, gravel sand with pebble (Miocene): from 8 m (P3) to 23 m (P2);
Loam Sandstone: minimum embedding of 6 m (p1);

Bridge provisional piers: driving of 36 Ø 1200 mm tubes (1.640 lm) maximum depth reached: 54 m;

Other works:
Execution of quays with 80×16 m (southern riverbank), 1.992 m of tubes Ø 813 mm, Ø 863 mm and Ø 1020 mm. Consumption of 289 tons of steel, assembling 18 tons per week, including pre-slabs;
Execution of quays with 42×6 m (northern riverbank), 588 m of tubes Ø 813 mm, consuming 69 tons of steel.

Dredging:
South Margin: 32.000 m³
North Margin: 5.500 m³