Pilling
Stage 1 of construction for an industrial seawater intake basin cofferdam in the Gulf region was the installation of 800 mm diameter heavily reinforced cast-in-place bored piles at 900 mm centres. Tight tolerances for pile location and verticality were met by sinking 6,5 m long temporary casings with a vibrator through a concrete template. The piles were bored to between 12 and 19 m on a "hit-and-miss" basis; 48 hours elapsed between concreting of adjacent piles. After boring and cleaning out, prefabricated reinforcement cages and high slump concrete were placed using tremie techniques and the casing withdrawn using a vibrator. In 4 piles, tubes were inserted for installation of inclinometers. In 62 working days 276 No. piles were installed, 274 tonnes of steel fixed and 2,130 m³ of concrete poured.

Wing Jet Grouting
Whilst piles and anchors were suffficient to prevent collapse, water tightness was required to seal the pile wall joints. Soilcrete-Wing Jet Grouting was used between piles. This technique consisted of predrilling holes through a top 1.5 m casing to av. 10.8 m, stabilising with a bentonite suspension, lowering of hollow stem rods fitted with a special tip and pumping of cement grout at 300 bars pressure as the rods were slowly withdrawn. At this pressure, the grout formed a "V" shaped column behind the pile joints. For the wing wall joints, Soilcrete(®) techniques were used to form circular grout columns. In 42 days 2908 m of holes were predrilled and 1 million litres of grout injected.