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A short class with Sarah and her students. The other ways are under More.
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Let's begin our discussion by looking at how trucks are classified in construction. Can anyone tell me why we classify trucks by whether they're allowed on public highways?
I think it might have to do with their size and weight.
Exactly! Trucks not allowed on highways are called off-highway trucks and are typically larger, often seen in quarries. Now, what are some types of trucks based on their dumping methods?
Rear dump, bottom dump, and side dump trucks!
Great! Remember, rear dump trucks can be time-consuming due to needing precise positioning. That's why we need to consider each type's efficiency. Let's recap: Off-highway trucks have larger capacities and different dumping types influence their usage.
Now, let's dive into the production cycle of trucks. Who can outline the phases of this cycle?
It starts with spotting the loader, then the loading process, hauling the load, and finally dumping it.
Exactly! Each of these steps contributes to the total cycle time. Does anyone know what factors contribute to fixed times?
Those would be things like loading time and how we dump the materials, right?
You're correct! These factors don't change based on haul distance. Let's try to remember this production cycle with the acronym SLHD, standing for Spot, Load, Haul, and Dump.
Moving on, let's discuss how to estimate truck productivity. Why do you think matching the capacities of loaders and trucks is crucial?
If they don't match, it could lead to inefficiency, right?
Exactly! An ideal scenario is having a truck's capacity being four to five times that of the loader bucket's capacity. How would we calculate the number of bucket loads needed to fill a truck?
We’d divide the truck's capacity by the bucket capacity!
That's right! If we have a decimal result, how should we round that?
If it's less than 4.5, we round down, and if it's above, we round up.
Good job! This ensures we maximize efficiency and productivity.
The maximum distance a type of earth-moving equipment can efficiently operate before becoming uneconomical.
The time components of the production cycle that do not change with haul distance.
The time components of the production cycle that depend on haul distance and operational speed.
The measure of how effectively a truck can transport materials in a given time.
In the quarries so tall, off-high trucks are the call. Dumping from the rear, they bring materials near!
Imagine a busy construction site where the off-highway truck is the giant worker, endlessly hauling earth while the loader fills its belly with the dirt before it rolls off to dump it in the right spot.
SLHD = Spot, Load, Haul, Dump - helps us remember the production cycle of trucks.
TDC = Truck, Dump, Cycle - an acronym for understanding truck operation in terms of cycles.
Term
What is an off-highway truck?
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Term
What are the three main dumping methods for trucks?
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Term
Define fixed time in the context of truck productivity.
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Explain variable time.
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A large truck not permitted on public highways due to its size and weight, often used in quarries.
A type of truck that dumps materials from the back.
A type of trailer that dumps materials from the bottom opening.
A type of truck design that allows for better maneuvering and turning.
Components of the production cycle that do not vary with haul distance, such as loading and dumping times.
Components of the production cycle that depend on haul distance and speed.
This section discusses the classification of trucks in earth moving operations, their production cycles, and how to estimate their productivity based on fixed and variable times.
The section elaborates on different types of trucks used for earth moving and their specific characteristics. It highlights the production cycle of trucks, distinguishing between fixed and variable times, and outlines the process to estimate truck productivity, emphasizing the importance of matching capacities between trucks and loaders.
In this section, we explore the different types of trucks employed in construction, emphasizing both their characteristics and their operational contexts. Trucks can be classified based on permissible highway use, method of dumping (rear, bottom, side), frame type (rigid or articulated), engine type, and drive configuration. The efficiency of these trucks is heavily influenced by their economic haul distance and the operational context they fit into. We break down the production cycle of trucks into distinct phases: spotting the loader, loading, hauling, and dumping, while categorizing these phases into fixed and variable times. Fixed times, which are not influenced by haul distance, include loading, maneuvering, and material dumping based on type. Variable times, in contrast, depend on haul and return distance and speed. Finally, we detail how to estimate truck productivity by determining the necessary bucket loads to fill a truck and the implications of load capacity mismatches between trucks and loaders.