Ch. 12 EQUIPMENT PRODUCTIVITY

Ch. 12 EQUIPMENT PRODUCTIVITY - CHAPTER 12 EQUIPMENT...

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Click to edit Master subtitle style EQUIPMENT PRODUCTIVITY CHAPTER - 12
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LASER BASED MACHINE CONTROL The Need: ¡ Construction equipment using laser control technology can achieve higher levels of productivity
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Grader with Topcon 30-MC Computer and Total-Station Receiver
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THE TECHNOLOGY n New systems use three modules to control the piece of equipment: ¡ survey that upload in a total station using a computer notebook. ¡ A receiver mounted on the blade of the equipment, intercepts the laser beam. ¡ The interface between the positioning information and the actual steering of the equipment is performed through the use of a control system device which converts the digital data into machine hydraulic pulses. n The main benefit of these systems is the gain of productivity. The laser devices can triple the productivity of equipment on highway projects
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PRODUCTIVITY CONCEPTS n The cycle of equipment pieces is the sequence of tasks which is repeated to produce a unit of output (e.g., a cubic yard, a trip load, etc.) n There are two characteristics of the machine and the cycle that dictate the rate of output; the cycle capacity of the machine and the cycle rate or speed of the machine n A hauler such as a scraper pan, usually has a rated capacity. “Struck” vs. “Heaped” capacity. The bowl of the scraper can be filled level (struck) yielding one capacity or can be filled above the top to a heaped capacity n The material has a different weight-to-volume ratio when it is placed in its construction location (e.g., a road fill) and is compacted to its final density n This leads to three types of measurement; 1) bank cubic yards ( in situ vol ), 2) loose cu. yd. and 3) compacted cu. yd.
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PRODUCTIVITY CONCEPTS (continued) n Payment based on the placed earth construction so that the “pay” unit is final compacted cu. yd. (see fig. 12-1) n See pg. 186 equations to calculate percent swell and the load factor n Percent swell for fig. 12-1 is 30% n Table 12-1 gives the load factor for various materials n Higher the load factor, the smaller tendency to “bulk- up” n Therefore, with a high load factor, the loose volume and the in situ vol tend to be closer to one another n See pg. 187
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Figure 12-1 Volume Relationships
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Table 12-2 Typical Rolling Resistance Factors
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Ch. 12 EQUIPMENT PRODUCTIVITY - CHAPTER 12 EQUIPMENT...

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