Dump trucks are used to transport materials to and from construction sites. They have a sturdy rear platform with an open gate and hydraulic lift. They can be filled with bulk materials using front loaders or an overhead hopper. Some dump trucks have a metal hopper to deposit materials in rows. They can be rigid or articulated, and some haulers tow a smaller trailer called a puppy to unload material in stages.
Materials such as gravel, sand and backfill must be brought into most construction sites, while waste materials such as old bricks and excavated earth must be brought in. Most of this work is done with specialized vehicles called dump trucks. Dump trucks can be as small as a regular passenger truck or as large as an 18-wheeler. They are distinguished by a sturdy rear platform with an open gate on one side and a hydraulic lift on the other.
Dump trucks are commonly used to transport bulk materials that cannot be supported on an open flatbed truck. The quarry or other supplier may use front loaders or an overhead hopper to fill the trucks to capacity, then some form of protective cover may be used to prevent debris from falling out during transport. Once the trucks reach their destination, the rear gate is released and a hydraulic lift raises the front of the bed. The material is usually left in piles near the construction area.
Some haulers use a different type of bed to deposit materials in rows. The rear assembly looks like a metal hopper with several funnels leading to the ground. Instead of lifting the attached hopper, these carts drive along the rows as material pours out the bottom. This can be a useful feature whenever small amounts of material are needed over a large area, such as on a road under construction.
Haulers can have a rigid assembly, with the bed and cab forming one vehicle, or they can be articulated, so the bed can be removed from the main cab. Some haulers also tow a smaller trailer, commonly called a puppy, for the purpose of unloading material in stages. The puppy is filled to capacity and taken to the construction site with a different towing system. Once the contents are emptied, the pup comes back for a refill. This prevents trucks from having to travel too far into a construction zone.
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