Excavating and Lifting

1
Excavating and Lifting

• Hmwk
• Ch 2 1,2,5,8
• Ch 3 2,4,6,10

2
Excavators Crane Shovels

• Crane Shovel cable operated machines
• Shovel
• Backhoe
• Dragline
• Clamshell
• Mobile crane
• Pile driver

3
Excavators Crane Shovels

• Hydraulic Excavators
• Faster cycle time than shovels
• Higher bucket penetrating force
• More precise digging
• Easier operator control
• Attachments pg 41 - 43

4
Excavators Crane Shovels

• Parts Figure 3-2
• Carrier or mounting
• Track
• Excellent on-site mobility will go anywhere
• Low ground pressure good for low trafficablity
  soils
• truck wheel mountings
• Greater mobility between job sites faster
• Require better surfaces to work on
• Revolving superstructure containing power and
  control units
• Front end assembly

5
Production

• Need to know volume of material in one bucket
  load Figure 3-1
• Plate line capacity volume contained in outline
  of bucket
• Struck capacity volume when matl is struck off
  even w/ sides of bucket
• Water line capacity assumes material only to
  lowest edge of bucket
• Heaped capacity max volume that can be placed
  in bucket without spillage

6
Production

• Ratings usually based on struck volume
• Assumption is made that since bucket is usually
  heaped that a 5 cy bucket will pick up 5 cy of
  bank not loose
• Better to use bucket fill factors Table 3-2

7
Operation Employment

• Excavators
• Fig 3-3 3-4
• Trenching work
• Production estimating
• Production (LCY/hr) CxSxVxBxE
• C cycles/hr
• S swing depth factor T 3-4
• V heaped bucket volume
• B bucket fill factor
• E job efficiency
• Trenching work may also require a fall in factor
  for dirt going back in the trench T 3-5

8

• Shovels
• Larger than excavators
• Good for excavating above track line
• Digs using
• Breakout force and crowding force
• Can form its own roadway
• Can shape sides of cut and dress slopes
• Should have a vertical face to dig against
• Production is found same way

9
Trenching Technology

• Good for digging a narrow trench with the spoil
  going to the side of the trench
• Chain trenchers, ladder trenchers, bucket wheel
  trenchers

10
Trenchless Tech

• Pipe jacking
• Thrust boring
• Pipe bursting

11
Cranes

• Lifting, lowering transporting loads over 3D
• Components Fig 3-22
• Load chart F 3-24
• Heavy Lift cranes
• F 3-25 26
• Tower Cranes
• F 3-27 - 29