Chapter 6 Excavation Equipment

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Chapter 6 Excavation Equipment 6. Introduction: This chapter will deal with some types of equipment that are used to excavate earth and related materials and to lift Items frequently used in cons... truction operations. The equipment includes the following:  Power shovels (آلية مجرفات).  Backhoes (جرافات).  Cranes (رافعات).  Trenching machines (الخنادق حفر آالت).  Wheel-mounted belt loaders (مدولبة رافعة احزمة). The first three machines belong to a group identified as the Power Crane and Shovel Association family. This association has supervised studies and tests which provided information related to the performance, operating conditions, production rates, economic life and cost of owning and operating such equipment. The results of these studies have been published and are adopted as standards for such equipment. In this chapter we will study the Power Shovels. 6.1. Power Shovels: Power shovels are used primarily to excavate earth and load it into trucks or tractor–pulled wagons or onto conveyer belts. They are capable of excavating all classes of earth, except solid rock, without prior loosening. They may be mounted on crawler trucks (crawler-mounted shovels), such shovels have very low travel speed but their wide treads give low soil pressures, which permit them to operate on soft ground. Fig. 6-1 illustrates a crawler-mounted shovel. Power shovels may be mounted on rubber tired wheels. Fig. 6-1 Illustrates a Crawler-Mounted Shovel Construction Methods ……………..……………………………………….… Ch.-6- Excavation Equipment [Show More]

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