5. A contractor has decided to use a hydraulic backhoe to excavate a 24-inch wide trench for the construction of a water line. The backhoe has a general purpose bucket with a rated heaped capacity of 19 cubic feet. The average depth of the 400-foot trench is about 6 feet. The soil to be excavated is tough clay with a swell of 33%. Operational efficiency is estimated at 45 minutes per hour. 1. What is the estimated productivity of the backhoe in bank cubic yards per hour, if job conditions are considered average? 2. How long will it take to excavate the trench?

5. A contractor has decided to use a hydraulic backhoe to excavate a 24-inch wide trench for the construction of a water line. The backhoe has a general purpose bucket with a rated heaped capacity of 19 cubic feet. The average depth of the 400-foot trench is about 6 feet. The soil to be excavated is tough clay with a swell of 33%. Operational efficiency is estimated at 45 minutes per hour. 1. What is the estimated productivity of the backhoe in bank cubic yards per hour, if job conditions are considered average? 2. How long will it take to excavate the trench?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Measuring site work, Excavation and Piling

Bid drawings typically include very little material about the precise requirements of site work operations, measuring site work and excavation work differs from measuring most other works on a construction project. The actual site work conditions are not provided and also the dimensions of the excavations are not known during the pre-construction phase. The precise measurement of the excavation and backfill of the earth material and topsoil is important for a contractor to decide upon the total cost required for the process. All the works should be carried out under OSHA (Occupational Safety and Health Administration) standards to ensure the safety of the workers.

Question

5. A contractor has decided to use a hydraulic backhoe to excavate a 24-inch wide trench for the
construction of a water line. The backhoe has a general purpose bucket with a rated heaped capacity of
19 cubic feet. The average depth of the 400-foot trench is about 6 feet. The soil to be excavated is
tough clay with a swell of 33%. Operational efficiency is estimated at 45 minutes per hour.
1. What is the estimated productivity of the backhoe in bank cubic yards per hour, if job conditions are
considered average?
2. How long will it take to excavate the trench?

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