Grout Pumping and Injection Operations TR 003 ▪ Operate stirrer to circulate water. Use high pressure water to dislodge grout build-up. If scraping is necessary in the agitator drum and on the stirrer – ENSURE THE STIRRER IS TURNED OFF OR PLANT ISOLATED, even though there is a safety switch because it is easy to mistakenly push down the safety switch during cleaning. ▪ Wash down all external surfaces. 5.1.3 Grout Pump ▪ Fill agitator with clean water. ▪ Run grout pump to flush water through the grout hose. ▪ Close grout discharge hose and open grout recirculation hose and run pump, pumping water continually through the pump for several minutes. ▪ Discharge this water through the grout hose by opening the discharge valve and closing the recirculation valve. ▪ Repeat this process several times until water runs clear through the pump and hoses. ▪ Ensure grout discharge and recirculation valves are thoroughly cleaned and free moving. Lubricate after cleaning. ▪ Wash down all external surfaces. After extended grouting during a shift or at least weekly, the large ball valves and seats within the grout pump, must be overhauled. This is to ensure their effective operation. Periodically, the grout plant should be brought to the surface for routine maintenance and complete clean-up with special cement removal compounds, i.e. “Agi Clean” or similar. Refer to MSDS for these compounds where applicable. 5.2. Record Keeping Correct & comprehensive record keeping is one of the most important parts of the grouting process. Recording of information such as; name or number of hole; depth at which packer is set; start and finish times; injection pressures; types and volumes of product injected; flow rates at which it is injected; QA results; any surface leaks or connections of holes, interruptions or any other information is all valuable & necessary to allow us to evaluate what we have already done and allow us to make informed decisions as to what we do next. It allows us to keep track of where we are in respect of the grout plan/flow chart. Below is an example of FRM78580001 Pressure Grouting Report which is to be completed on the job as grouting is in progress. This is to be handed in to the Supervisor at the end of each shift. The amount of grout injected is measured by taking a dip from the holding tank (agi) using a graduated stick at regular intervals. By adding any batches transferred to the holding tank to the previous dip recorded we are given our new Subtotal. Once the following dip is taken we then subtract it from our Subtotal, giving us our usage during that interval. We then divide the usage by the time lapsed during that interval to calculate the flow rate. On this spread sheet the columns are marked A, B, C etc. and the formula, once explained can be easily followed as per the example at the bottom. However it does require some mathematical calculations.
RkJQdWJsaXNoZXIy MjE2NDg3