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ASSIGNMENT NUMBER 1
MATERIALS TRANSPORTATION WITH TOWER CRANES. LIFTING DEVICES
Choose the tower crane necessary to lift different loads. Establish the lifting device type.
1.1. Calculation steps
1. Estimate the loads characteristics;
2. Determine the working fronts of the lifting device;
3. Evaluate the necessary technological parameters for the lifting device;
4. Choose the lifting device.
1.2. The assignment content
a) Computation notes in order to choose the tower crane necessary for a particular job, evaluation of the necessary technological parameters for the lifting device;
b) Technological sheet for materials transportation with tower cranes:
- working front;
- lifting device.
1.3. Short history of cranes
There are several types of cranes, each of them with specific features in order to fulfill the demands for particular jobs:
Truck – mounted crane
A crane mounted on truck carrier which provides the mobility for the crane.
Outriggers that extend horizontally and vertically are used to level and stabilize the crane for hoisting.
Loader crane
A loader crane offloads aerated concrete bricks at a building site.
This is a hydraulically – powered articulated arm fitted to a trailer, used to move goods onto or off of the trailer.
Unlike most cranes the operator must move around to be able to view his load; hence he will have a portable cabled or radio linked control system.
The numerous jointed sections can be folded into a small space when the crane is not in use. One or more of the sections may be telescopic.
Often the crane will have a degree of automation and be able to unload or stow itself without an operator's instruction.
Rolloader crane
This is a loader crane mounted on a chassis with wheels. This chassis can ride on the trailer.
Because the crane can move on the trailer, it can be a light crane, so the trailer is allowed to transport more goods.
Rough terrain crane
A crane mounted on an undercarriage with four rubber tires that is designed for pick – and – carry operations and for off – road and rough terrain applications.
Outriggers that extend horizontally and vertically are used to level and stabilize the crane for hoisting.
These telescopic cranes are single-engine machines where the same engine is used for powering the undercarriage as is used for powering the crane, similar to a crawler crane.
However, in a rough terrain crane, the engine is usually mounted in the undercarriage rather than in the upper, like the crawler crane.
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