By United States Government US Army
Box guide FM 5-434 MCRP 3-17.7I Earthmoving Operations This box handbook (FM) is a advisor for engineer body of workers chargeable for making plans, designing, and developing earthworks within the theater of operations. It supplies expected construction charges, features, operation options, and soil issues for earthmoving gear. This advisor may be used to aid opt for the main most economical and powerful gear for every person operation. This handbook discusses the whole technique of estimating gear creation charges. notwithstanding, clients of this guide are inspired to exploit their adventure and knowledge from different tasks in estimating creation charges. the cloth during this handbook applies to all building apparatus despite make or version. The apparatus utilized in this guide are examples simply. details for construction calculations could be got from the operator and upkeep manuals for the make and version of the gear getting used.
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Wet or sticky material may be difficult to unload or spread. When operating in these material types • • • • • Do not try to spread the material too thin. Keep the bowl high enough to allow the material to pass under the scraper. Material not having enough room to pass under the scraper will roll up inside the bowl into a solid mass that is difficult to eject. Bring the ejector forward about 12 inches at a time. Back the ejector about 6 inches after each forward movement. This breaks the suction between the material and the bowl.
This breaks the suction between the material and the bowl. Repeat this procedure until the bowl is empty. PRODUCTION ESTIMATES 3-73. Following is an explanation of production estimating based on a step-bystep method using the CAT 621B scraper. When developing data for production estimates, consider all factors that influence production. Consider the scraper’s weight, the weight of the load, and the average grade and rolling resistance of both the haul and return routes in arriving at a cycle time.
The condition is worse for finer and drier particles. When loading sand, the best method is as follows: Step 1. Enter the loading area fast, lowering the bowl slowly, and pick up as much material as possible using the momentum of the scraper unit. This will fill the hard-to-reach rear area of the bowl. Step 2. Shift to a lower gear once the momentum is lost, and allow the pusher to assist. Step 3. Pump the bowl up and down (Figure 3-5). For best pumping results, drop the bowl as the scraper’s rear wheels roll into the depression of the previously pumped area and raise the bowl as the wheels are climbing out of the depression.
Earthmoving Operations [US Army FM 5-434] by United States Government US Army