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Construction Methods. Lecture 5 Excavating and Lifting. Excavating and Lifting. Trenching Machines and Plows The figure shows a large chain trencher capable of digging 0.35-0.9 m wide vertical-sided trenches to a depth of 3.1 m.
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Construction Methods Lecture 5 Excavating and Lifting
Excavating and Lifting • Trenching Machines and Plows • The figure shows a large chain trencher capable of digging 0.35-0.9 m wide vertical-sided trenches to a depth of 3.1 m. • Ladder trenchers are similar to chain trenchers but are larger. They are capable of digging trenches up to 3.1 m wide and 7.6m deep. • Bucket wheel trenchers use a revolving bucket wheel to cut a trench up to 1.5 m wide and 2.7 m deep.
Excavating and Lifting • Trenchless Technology • Pipe jacking
Excavating and Lifting • Trenchless Technology • Horizontal earth boring
Excavating and Lifting • Trenchless Technology • Microtunneling or utility tunneling • Repair and Rehabilitation of Pipelines • The relining of a pipeline • Pipe bursting
Excavating and Lifting • Cranes • Cranes are primarily used for lifting, lowering, and transporting loads. • They move loads horizontally by swinging or traveling.
Excavating and Lifting • Cranes • The mobile telescoping boom crane shown is capable of lifting loads to the top of a 24-story building. • The major factor controlling the load that may be safely lifted by a crane is its operating radius • Some of the other factors influencing a crane's safe lifting capacity include the position of the boom in relation to the carrier, whether or not outriggers (beams that widen the effective base of a crane) are used, the amount of counterweight, and the condition of the supporting surface.
Excavating and Lifting • Cranes • Safety regulations limit maximum crane load to a percentage of the tipping load. • Crane manufacturers provide charts giving the safe load capacity of the machine under various conditions.
Excavating and Lifting • Cranes
Excavating and Lifting • Heavy Lift Cranes • The crane shown has a maximum lifting capacity of 209 t and a maximum lifting height of 113.3 m.
Excavating and Lifting • Tower Cranes • The tower crane is widely used on building construction projects because of its wide operating radius and almost unlimited height capability. • Major types of tower cranes include horizontal jib (or saddle jib) cranes, luffing boom cranes, and articulated jib cranes • The majority of tower cranes are of the horizontal jib type
Excavating and Lifting • Tower Cranes • The majority of tower cranes are of the horizontal jib type. • However, luffing boom (inclined boom) models have the ability to operate in areas of restricted horizontal clearance not suitable for horizontal jib cranes with their fixed jibs and counterweights.
