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2015FallShotcreteEMag

Safety Shooter always stay on secure, stable ground. Never drive I like to get the largest one that will fit for the job a lift off a small ledge or step thinking that because while not causing any of its own risks and not it has off-road tires it can handle this stuff. The pricing you out of the job. A larger lift is more off-road tires are to prevent these heavy things stable because it is heavier and can typically sup- from getting stuck on flat ground that is slightly port more weight on the work platform. The uneven, not to go rock crawling such as one would heavier lift will reduce motion of the lift caused in a Jeep. When the counterweight portion of the by the nozzlemen’s movements while shooting, lift steps off the ledge or step, it will sway and try especially with the wet-mix process, where the very hard to launch the operator out of the basket. hose is heavier. Less movement of the lift allows Additionally, when driving up or down a hill, for better nozzle control. Nothing in shotcrete is always keep the counterweight on the upside of light; even the small parts are heavier than they the hill. If the counterweight is on the downside look. So let’s think about what a basket is really of the hill and the hill is steep enough, the lift can holding up. A nozzlemen weighs, on average, overturn and the operator could get seriously between 230 and 300 lb (100 to 140 kg) with their injured. Remember that with scissor lifts raised PPE, basic tools, clothes, and boots. So even and with boom lifts you are at the end of a very before you add a concrete hose, nozzle, and con- long stick and when the base moves slightly, the crete in the hose to the lift, you have already most movement of the basket is magnified immensely. likely exceeded 500 lb (230 kg), which is a Adding shotcrete to a scissor lift adds its own common weight limit for small and medium lift issues to be careful about—primarily weight and equipment. Add the empty concrete hose and you movement. When renting a lift for shotcrete work, get 3 lb/ft (4.5 kg/m)—say the job is 50 ft (15 m) Fig. 1: Nozzlemen shooting a research tank from a lift. The site had terrible soil, which required an all-terrain lift with tracks instead of wheels to give safe access for nozzling and finishing Shotcrete • Fall 2015 47


2015FallShotcreteEMag
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