The superintendent in a concrete batch plant has measured the following cycle times for a large pouring operation, for which she is using 10 trucks of 9 cubic yards each a What would be the theoretical productivity of this system without considering the bunching effect b What is the approximate los...

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The superintendent in a concrete batch plant has measured the following cycle times for a large pouring

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The superintendent in a concrete batch plant has measured the following cycle times for a large pouring operation, for which she is using 10 trucks of 9 cubic yards each.

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a. What would be the theoretical productivity of this system without considering the bunching effect?

b. What is the approximate loss of productivity due to the bunching effect explained in problem 15.6? Use the Caterpillar method.

c. What is the productivity of this system, in CY/hr?

Problem 15.6

You own a fleet of 30-cubic-yard tractor scrapers and have them hauling between the pit and a road construction job. The haul road is clayey and deflects slightly under the load of the scraper. There is a slight grade (3%) from pit at the fill location. The return road is level. The haul distance to the dump location is 0.5 miles and the return distance is 0.67 miles. Four scrapers are being used.

a. What is the rimpull required when the scraper is full and on the haul to the fill?

b. What are the travel times to and from the dump location (see Figure 15.10)?

c. The scrapers are push-loaded in the pit. The load time is 0.6 minutes. What is the cycle time of the pusher dozer?

d. Is the system working at, above, or below the balance point? Explain.

e. What is the production of the system?

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Related Book For book-img-for-question

Construction Management

ISBN: 9781119256809

5th Edition

Authors: Daniel W. Halpin, Bolivar A. Senior, Gunnar Lucko

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Question Posted: Feb 17, 2024 04:00 AM

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The superintendent in a concrete batch plant has measured the following cycle times for a large pouring

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Cycle # 1 2 3 4 5 6 7 8 9 10 Duration (min) 30.5 25.4 27.3 29.1 23.5 24.3 19.8 25.8 23.7 25.1

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Construction Management

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