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2014SprShotcreteEMag

Nozzleman Knowledge Shotcrete Hose/ System Cleanout Safety By Carl Baur Icrews that the cleanout process can be very ft3/min (340 m3/h) compressor pushing airm) long.” AnotherMPa) of air and a 700hose with 120 psi (0.8through a hose 200 ft (60am writing this article to reinforce to themembers of wet- or dry-process shotcrete dangerous. There are a few precautions to be comment was, “Just wanted to break the new taken to ensure safety during cleaning of hoses guy in,” or “Let’s see how far we can shoot the in shotcrete systems. This is a reminder to take ball.” These comments demonstrate irrespon- every precaution to be safe, because even some sible actions that could get a crew member everyday practices can be deadly. severely hurt at some point. In this past year, I personally knew several The best way to clean out a shotcrete hose is people who sustained head injuries requiring to have a crew member secure the hose to a solid hospital treatment. As a result, these individuals object and then clear all persons from the area have potentially chronic health problems stem- when performing the cleanout. When cleaning ming from poor practice. In most cases, it takes out a long-distance system without the crew at least two crew members to clean out the members able to see one another, some sort of shotcrete hose. One person controls some source communication is a must; radio contact is the of energy to clean out the hose and the other most common. If a 2 in. (50 mm) hose has even person controls the end of the hose. The person a small amount of water in the shotcrete hose controlling the source of energy, whether it may and air is then applied to it, the hose will whip be a pump, compressed air, or water, should violently around even though there is no shot- never allow a person to simply hold the hose crete material remaining in the hose. As a result during the cleanout process. I have seen large of the potential whipping action, it is important men thrown around like a rag doll by a hose to have the area cleared of all persons. being cleaned out with air pressure. Some of The following are a few suggestions or ideas the comments were, “I thought I was tough you may want to implement in your cleanout enough to hold on to a 2 in. (50 mm) shotcrete procedures. Annual Nozzleman Compilation Annual Nozzleman Compilation ASA 2013 ASA 2013 This 36-page black and white soft-cover book is an annual publication introduced in 2013. This document is a compilation of 10 previously published articles from ASA’s Shotcrete magazine, Volume 15. Order Code: ANC13 ASA Members: $9.00 Nonmembers: $14.00 Visit www.shotcrete.org/BookstoreNet/default.aspx or call (248) 848-3780. 38 Shotcrete • Spring 2014


2014SprShotcreteEMag
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