Page 41

2015SummerShotcreteEMag

Sustainability Coastal a couple of times to shoot in other areas that later would be the scaffold stairwell and the shear wall area. This made it difficult for the reinforcement placing crew and waterproofing installers to stay in front of the shotcrete crew (Fig. 1 shows three crews working side-by-side). It was also found that the concrete quantities used were not matching the calculated quantities from the project drawings. The drawings detailed the wall as 14 in. (350 mm) thick, while the actual wall thickness measured between 16 and 19 in. (410 and 480 mm) thick on average. The shear wall measurement increased to 200 yd3 (150 m3). The transition into the second stairwell ranged from 1.33 to 5 ft (0.4 to 1.5 m) thick with Fig. 6: Different operations on this project were trying to get in and work only two rows of reinforcing steel. Adjusting making it difficult to perform the shotcrete placement while staying out of cast-in-place form widths to accommodate these everyone’s way thickness changes would have been extremely difficult and costly. By using the wet-mix shot- crete process, these significant thickness varia- tions were easily accommodated by adjusting the finish grade wires and using an alkali-free accelerator at the nozzle to shoot the thick sec- tions with no sloughing. Then Hensel Phelps began to push the shot- crete operation to make up time caused by the drilling and QC delays. All the contractors on the job had to work around the pile drilling company, which was still drilling piers and chip- ping down a few that were cast too high above the floor elevation. Vibration on the reinforce- ment from the chipping of the piles had to be monitored to prevent disturbing the freshly placed shotcrete. All shotcrete placement and finishing was Fig. 7: Keeping the walls and reinforcing steel wet in front of the performed out of man lifts to stay ahead of the shotcrete was a challenge so as not to activate the bentonite plumber who was installing the drain tile along waterproofing or create a muddy mess for the equipment to drive on Lic# 850501 ROB VONARB President PH: 818-833-1293 FAX: 818-833-1294 CELL: 818-519-7468 rob@shotcreteinc.com www.shotcreteinc.com 12965 San Fernando Rd. Sylmar, CA 91342 Shotcrete • Summer 2015 39


2015SummerShotcreteEMag
To see the actual publication please follow the link above