RC WOKS
(Based on Marina Barrage Project experience)


BASE RAFT SLAB
RAW DATA:
- Total Qty: 5043 m3;
- Total Duration: 45 day; :
- Barbender: 30 men;
- Carpenter cum concretor: 20 men;
- Casting method: mobile concrete pump with trunk distributor
TYPICAL CASTING UNIT:
- 35m x 10m, 460 m3;
- Duration: 4d;
PRODUCTION RATE FROM RAW DATA:
5043/45/50=2.24 m3/man.d


Raft base slab rebar in progress


Raft base slab section

PILECAP AND BASE SLAB
SEQUENCE OF WORK:
Excavation for pilecap, lean concrete, pilehead cutting, pile ECC, pilecap RC works (up to soffit of base slab) -> Excavation/backfill for base slab, lean concrete, pilehead cutting, pile ECC, slab RC works
TYPICAL CASTING UNIT: about 400m2;
TYPICAL SLAB CASTING VOL: about 350m3;
Duration from Pilecap to Slab: 12 day;
Duration for Slab RC Only: 3-4 day;
Working Gang:
- Barbender: 7-8 men;
- Carpenter and concretor: 7-8 men;
- Casting method: mobile concrete pump with trunk distributor
Production Rate for Base Slab Only: 350/(8x2+8x1+8x1)=10.9 m3/man.d


A casting unit consiting of pilecap and base slab

WALL
Working Condition::
- Formwork: Large panel wall formwork;
- Typical one wall formwork unit: 1.8m wide x 4.8m high;
- Typical one casting: 6-7 units of formwork to have one casting (length=1.8x7=12.6m);
- Typical one casting vol: 60m3;
- Crawler crane;
- Casting method: mobile concrete pump with trunk distributor
Working Gang:
- Barbender: 4 men;
- Carpenter: 4 men;
Duration for a Typical Casting: Rebar (2d) -> Formwork (2d) -> Casting (1d). Total for a unit: 5d;
Production Rate: 60/(4x2+4x2+4x1)=3 m3/man.d


Typical RC wall (thickness: 1 m) using large panel wall formwork


Wall formwork and its components

CROSS REFERENCE
System formwork