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and crew should have performed satisfactory work in similar capacities for a specified period. The entire crew is responsible for the safety of each member on any particular project. Shotcrete Foreman—The foreman commonly has proficiency in all crew positions and is in charge of the crew and the safety procedures. The foreman typically has at least 2 years of experi- ence in the placement of shotcrete. Nozzleman—The nozzleman should be ACI certified (refer to ACI CP-60, “Craftsman Work- book for ACI Certification of Shotcrete Nozzle - man”) and have completed at least one application as a nozzleman on a similar project for the shot- crete contractor. In congested reinforced projects, the nozzleman should also be able to demonstrate, by preconstruction testing, an ability to satisfac- torily perform the required duties and to apply Fig. 1: Nozzleman with shotcrete as required by specifications. his air lance man and Assistant Nozzleman/Nozzleman Trainee— hose tender The assistant nozzleman/trainee should have 6 months of experience in a variety of shotcrete field operations that may include finishing, gun or pump operation, blowpipe/air lance control, and hose tending. The assistant should be able to demonstrate knowledge of proper shotcrete equipment setup (pump/gun, delivery hose, nozzle, and air/water supply). When shooting, the assistant must be under the direction of an Fig. 2: Nozzleman, air ACI Certified Nozzleman. lance man, and finisher in Blowpipe/Air Lance Control—This person the background should have experience in finishing shotcrete and have proven successful manipulation of the blowpipe on previous jobs as directed by an ACI Certified Nozzleman, shotcrete foreman, or superintendent. Wireman—The wireman should have at least 1 year of experience in setting grades on projects with shotcrete applications. Rodman and Finisher—The rodman and finisher must have shotcrete experience and care must be taken not to create sags and loss of bond. Previous work experience that provided accept- able results should qualify him for this position. Gunman or Pump Operator—The gunman or pump operator should be familiar with and able to operate the shotcrete delivery equipment, know the proper methods of material preparation and mixing, and be familiar with the chosen method of communication. The pump operator and gunman should preferably have at least 1 year of experience operating the intended equip- ment and be familiar with all manufacturers’ safety guides and operations. Mixerman—The mixerman should know and perform the proper methods of material preparation and mixing to consistently mix and maintain the required mixture proportions, Fig. 3: Pump, nozzleman, and hose tenders including the proper water-to-cementitious 30 Shotcrete • Summer 2013


2013SumShotcreteEMag
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