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2015FallShotcreteEMag

Safety Shooter high at maximum, that is another 150 lb (68 kg) on the basket before you add concrete. The con- straight line from the ground to the basket, add crete in the hose will add another 2 to 3 lb (3 to 10 ft (3 m) of hose in the basket and another 5 ft 4.5 kg/m) per foot, getting your hose weight (1.5 m) of hose because it’s not perfectly straight upwards of 360 lb (160 kg) that the basket is sup- down and you get 180 lb (82 kg) of empty hose porting as well. You should also be sure to tie the hose off well to the basket to support it. Also, it is a good idea to tie a rope from the basket to the halfway point on the hose to give the hose more support and reduce the swinging motion of the hose while shooting. Based on these weights, you would want a minimum 1000 lb (450 kg) weight limit basket in a lift (refer to Fig. 2 and 3). It is also a tempting idea to tie the nozzle to the handrail on the boom lift to allow for shooting with less fatigue of the nozzlemen. This may work, but if the shotcrete needs to encapsulate reinforcing bar well, the nozzlemen should really be holding the nozzle to provide the precise nozzle motion needed for good encasement. Additionally, if the nozzle is tied off, the higher pressures of wet-mix shotcreting can add higher risk if the nozzle plugs. If seriously high volumes are needed, I would recommend a shotcrete robotic arm over a boom lift. Finally, make sure the hose is safe. If the hose gets kinked or crushed under any moving parts or the tires, this can cause a dangerous situation for the nozzlemen when flow restarts suddenly after the constriction is removed. Fig. 2: Nozzlemen using scissor lift instead of scaffolding to gain access It can also weaken the hose and make it more to the 270 ft (82.3 m) perimeter research tank project prone to breaking in the near future. In summary: • Use common sense; • Read the manual; and • Use the lift per the manufacturer’s directions. Following the lift guidelines and being fully aware of the loads on the lifts and maximum safe reach, along with and the basic safety rules, will keep everyone in and around the equip- ment safe. Mason Guarino, Vice President of South Shore Gunite Pools & Spas, Inc. (SSG), started in the pool industry when he was 14, learning how to install rein- forcing bar. Since then, he has worked on all phases of swimming pool construction. Guarino has worked full time with SSG since receiving his BS in construction management from the Wentworth Institute of Technology, Boston, MA, Fig. 3: Using the lift on the research tank allowed us to easily reach the in 2009. Guarino currently serves on ASA’s Board 20 ft (6 m) heights and move along quickly and safely of Direction and is an ACI Certified Nozzleman. 48 Shotcrete • Fall 2015


2015FallShotcreteEMag
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