Lean Construction Ireland Annual Book of Cases 2021 26 Figure 6. Placing Boom Locations Figure 5. ActualView of Slab Showing the Locations of the Placing Booms Case 6 Improve We looked at the-swap-over for the placing booms as being the area where we would focus our improvement efforts.We needed to reduce the time taken to complete the swap-over and we used SMED as the principle for achieving this.Additional resources were needed by the formwork contractor tomanage the changeover, and we developed the following solution: • Break the task into its constituent parts and ensure there were separate crews for : • Washing out the placing boom on the slab. • Cleaning out the line back to the pump. • Changing the line over fromone placing boom to the other. Each of these crews went through additional training in advance so they were very much aware of their specific tasks on the next pour day. We also ensured that some additional SMED elements were in place on the day of the pour : • Having a mortar bin full of water adjacent to the pump. • Having the compressor within reach of the pump. • Having a skip to blow the line safely on the slab so that no crane time was taken up locating these and getting them into position. There have been several notable wins for all involved in achieving the changeover process on schedule.The 2 hours saved overall in the middle of the pour had a knock-on effect that meant that the following could be achieved so as to impact positively on the remainder of the project: • The risk of the late pours costing more than €100,000 was mitigated. • Better relationship with local residents by completing the pours on schedule and not impacting them in terms of out of hours work. • LocalAuthority relationship maintained because there would be fewer complaints from the local residents. • Client relationship is also key, and,by achieving the changeover procedure on time, the pours would finish on time.This meant power-floating the slabs could happen earlier, giving us a significantly better chance of achieving a better quality finish to the entire slab as opposed to the 70% of the area on the first slab. • In this case, the addition of something as straightforward as additional trained and skilled operatives made the difference to enable a swifter and more efficient changeover. • The importance of having simple things like a mortar bin in the right place for washout, the right amount of cement to grout a pump, the concrete skip in place to wash out the placing boom, and so on, all meant that the tower crane was not required to lift over each of these items and further delay the changeover process. Control A dedicated Sisk package owner and dedicated reinforced formwork contractor supervisor were required each time to supervise this process and ensured everything went according to schedule. Lean Initiative Improvements & Impact
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