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Excavation equipment and sketches

Short answer

Excavation equipment includes bulldozer, scraper, power shovel, backhoe, dragline, clamshell, loader, grader, trucks and trenchers. Bulldozer pushes soil with a front blade over short distances. Backhoe digs below ground using a boom, stick and bucket, rotating 360 degrees.

What are the various equipment used for excavation and earth moving works? List them and explain any two with proper sketches.

Equipment for excavation and earth-moving

EquipmentMain use
BulldozerPushing earth, clearing, rough grading, spreading
ScraperExcavating, hauling and spreading over medium distances
Power shovel (front shovel)Excavating above machine level, loading trucks
Backhoe / hydraulic excavatorTrenches, below-ground excavation
DraglineExcavation below machine level, wet soils, dredging
ClamshellDeep narrow pits, shafts, loading
Front-end loaderLoading, short carrying
GraderFine grading, shaping and maintenance of roads
Trucks / dumpersHauling
TrenchersPipe and cable trenches

1. Bulldozer

     blade
    |\     cab
    | \___[_____]
    |_/ ====tracks====
   (pushes soil forward)

A crawler tractor with a front blade (straight, angle or U type) that pushes, cuts and spreads soil over short distances (up to about 100 m). It is used for clearing, opening roads and levelling; the blade can be raised, lowered or tilted by hydraulic rams.

2. Backhoe (hydraulic excavator)

              boom
          ___/\___ stick
         /        \
   cab  /          \
 [____]/            \_bucket (digs toward machine)
 [==tracks==]

The excavator has a boom, a stick and a bucket that digs by pulling toward the machine. It excavates below ground level for trenches, foundations and basements, and loads trucks. It can rotate through 360 degrees, and bucket sizes of 0.3-2 m3^3 are common.

✓ Answer checked by Claude Opus 5.5 (high effort)

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