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16. Loading Time and Gravimetric Capacity

The chapter focuses on the importance of understanding machine operating loads, gravimetric capacity, and the relationship between trucks and excavators in earthmoving operations. It emphasizes that exceeding the safe operating weight can lead to significant wear and tear on machinery, affecting production efficiency and costs. Furthermore, it discusses the balancing of interdependent machinery, highlighting how proper load management and scheduling can optimize operations.

Sections

Loading Time and Gravimetric Capacity

This section discusses the importance of loading time and the safe gravimetric capacity of machinery, emphasizing the consequences of overloading machines.

1 Section Overview

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1.1 Safe Gravimetric Capacity of Machines

This section discusses the importance of adhering to the safe gravimetric capacity of machinery, emphasizing how overloads can lead to damage and increased operational costs.

1.2 Checking Load Weight Against Gravimetric Capacity

This section discusses the importance of adhering to the gravimetric capacity of machines and how to effectively check the load weight against that capacity.

1.3 Impact of Overloading on Truck and Tires

This section discusses the consequences of overloading trucks and tires, emphasizing the importance of adhering to gravimetric capacities to avoid machine wear and increased operating costs.

1.4 Consequences of Overloading Trucks

Overloading trucks can lead to serious mechanical issues and increased operational costs due to wear and tear.

Dumping Time

This section explains the factors affecting dumping time in construction operations, including machine types and conditions of material.

2 Section Overview

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2.1 Factors Affecting Dumping Time

This section explores the key factors that influence the time required for dumping materials in construction operations.

2.2 Comparison of Dump Times for Different Truck Types

This section discusses the significance of understanding dump times for various truck types, emphasizing the impact of load weight, material density, and operational conditions on productivity.

2.3 Conditions Affecting Dump Times

This section discusses the impact of various conditions on the efficiency of dump times for trucks in construction operations.

Haul Time and Return Time

This section explores the importance of understanding haul time, return time, and the safe gravimetric capacity of machinery involved in construction and material handling.

3 Section Overview

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3.1 Determining Haul Time from Performance Chart

This section focuses on calculating haul time using performance charts while emphasizing the importance of adhering to the gravimetric capacity of equipment.

3.2 Calculating Return Time

This section explains how to calculate return time for trucks based on their loading conditions and machine capabilities, emphasizing safe operating limits.

Balancing Interdependent Machines

This section explains the importance of balancing interdependent machines, specifically trucks and excavators, to maximize efficiency and reduce operational costs.

4 Section Overview

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4.1 Balancing Trucks and Excavators

This section discusses the principles of balancing trucks and excavators to achieve optimal loading efficiency and productivity while adhering to safety load limits.

4.2 Determining Balanced Number of Trucks

This section addresses the importance of balancing the number of trucks with the excavator's cycle time to optimize productivity and avoid machinery overload.

4.2.1 When Trucks are Less Than the Balanced Number

This section discusses the importance of adhering to the balanced number of trucks relative to an excavator to maximize efficiency while also considering the machine’s gravimetric capacity to prevent overload.

4.2.2 When Trucks are Greater Than the Balanced Number

This section discusses the implications of having more trucks than the balanced number relative to excavators, focusing on productivity and operations.

4.3 Economics of Rounding Truck Numbers

This section focuses on the implications of loading trucks according to their gravimetric capacity and how to determine the optimal number of trucks needed for efficient loading processes.

Working on the Problem for Balancing Machines

This section covers the importance of balancing machines, particularly in terms of gravimetric capacity and cycle time in load distribution.

5 Section Overview

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5.1 Finding Balance Number of Bucket Loads

This section examines the importance of proper truck loading and balancing excavators and trucks for optimal productivity.

5.2 Calculating Truck Cycle Time

This section discusses methodologies for calculating the truck cycle time by considering factors such as loading time, gravimetric capacity, hauling speed, and the relationship between truck and excavator productivity.

5.3 Determining Truck Payload

This section discusses how to determine the safe payload for trucks based on gravimetric capacity and material density.

5.4 Estimating Truck Production

This section focuses on estimating truck production by understanding loading and unloading times, machine capacities, and balancing interdependent machines.

Learning Objectives

  • The gravimetric capacity is crucial for ensuring machinery operates within safe loading limits.

  • Congestion at dumping sites can significantly affect dumping time and overall productivity.

  • Balancing the capacities of trucks and excavators is essential for maximizing operational efficiency.

Key Concepts

Gravimetric Capacity

The maximum safe operating load for a machine, specified by the manufacturer, to ensure structural integrity and operational safety.

Dumping Time

The duration it takes for a machine to unload its contents, which can vary based on material type and congestion in the dumping area.

Balancing Interdependent Machines

The practice of aligning the capabilities and cycle times of trucks and excavators to ensure both operate at maximum productivity with minimal idling.

Practice Exercises

Total Questions

2

Estimated Time

4 min

Passing Score

70%

Instructions

  • Read each question carefully
  • You can use hints if you need help
  • Complete all questions before submitting
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