Figure 4-9. Two-Step T-push Continuous Construction
Method 2. One dozer and one scoop loader, grader, or CEV used as a team (Figure 4-9). This step is performed the same as the previous method except that the loader or CEV is used in place of vehicle 2. The grader is available to keep the berm straight and built up. After the ditch is constructed, and if time permits, the berm can then be further shaped. Normally, this method would be less productive than the first method. Again, more than one team may be used to construct the ditch.
Method 3. Tractor/scrapers in tandem used as a team. Using a tractor/scraper in tandem as a team is an excellent method of tank ditch construction. The scrapers can have the pan attached or use the tractor in a bobtailed configuration as a pusher to assist in loading. Each loaded scraper travels the full length of the tank ditch and exits toward the friendly side of the ditch to spread the load and form the berm. A grader can also be used to shape and smooth the berm, which reduces scraper-operator fatigue. Beanbag lights can assist during night operation to guide operators and to mark the turnout point. This method uses only horizontal construction assets and may free other diggers such as M9 ACEs, dozers, and bucket loaders to perform other missions.
Method 4. Tractor/scraper and M9 ACEs or dozers used in tandem as a team. This method uses scrapers as earthmovers and generally requires a pusher (such as an M9, dozer, or bobtailed scraper) to assist the loading of the scrapers. As the pusher and scraper (Figure 4-10) exit the ditch, the scraper will turn toward the friendly side to dump the load along the berm. The pusher exits on the enemy side and proceeds back to the beginning of the ditch to pick up another scraper. This method produces excellent results, but requires training to reduce idle-equipment "time" spent waiting for a pusher or scraper.
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