Chap 4 - Loading and Hauling - Cstm 456

Chap 4 - Loading and Hauling - Cstm 456 - Cst M 456...

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Cst M 456 Construction Equipment, Planning, & Methods
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Fundamentals Chapter 4 Loading and Hauling Match the best machine with the project requirements. Two major considerations an estimator must consider while investigating an earthmoving project: 1)Total quality of material 2)Size of the individual pieces
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Fundamentals Chapter 4 Loading and Hauling Payload is measured Volumetrically – struck or heaped capacity Gravimetrically – capacity of safe operational hauling weight Both volumetric and gravimetric measurements can be expressed in BCY, LCY or CCY
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Fundamentals Chapter 4 Loading and Hauling Machine Performance There are three power questions you must analyze: 1) Required power 2) Available power 3) Usable power
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Fundamentals Chapter 4 Loading and Hauling Required power Power to propel the machine & two factors that establish power: (1) rolling resistance & grade resistance Total Resistance (TR) = Rolling Resistance (RR) + Grade Resistance (GR) Total Resistance is always expressed in lbs.
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Fundamentals Chapter 4 Loading and Hauling Rolling Resistance – resistance of a level surface to constant velocity of motion. Can be referred to as either: Wheel Resistance Or Track Resistance
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Fundamentals Chapter 4 Loading and Hauling Thus Rolling Resistance can be either: Wheel Resistance = Rimpull Track Resistance = Drawbar pull Power to overcome the “rolling resistance” can then be referred to as either Rimpull power or Drawbar pull power.
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Fundamentals Chapter 4 Loading and Hauling Rolling Resistance is then expressed as a function of the vehicle weight in tons or as expressed as a equivalent grade resistance . Rolling Resistance is always expressed in pounds of tractive push or pull power needed to overcome the surface of the road.
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Fundamentals Chapter 4 Loading and Hauling Rolling Resistance as Rimpull Rimpull = 40lb/ton rr factor concrete surface. See table 4.1 30lb/ton = every inch of tire penetration into the haul road surface.
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Fundamentals Chapter 4 Loading and Hauling Example of a rolling resistance problem consisting of a rimpull power: A 1-ton pickup truck traveling over a level, hard-packed Palouse road
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This note was uploaded on 04/07/2008 for the course CSTM 456 taught by Professor Kirk during the Fall '07 term at Washington State University .

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Chap 4 - Loading and Hauling - Cstm 456 - Cst M 456...

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