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Construction Methods

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

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  1. Construction Methods Lecture 5 Excavating and Lifting

  2. 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.

  3. Excavating and Lifting • Trenchless Technology • Pipe jacking

  4. Excavating and Lifting • Trenchless Technology • Horizontal earth boring

  5. Excavating and Lifting • Trenchless Technology • Microtunneling or utility tunneling • Repair and Rehabilitation of Pipelines • The relining of a pipeline • Pipe bursting

  6. Excavating and Lifting • Cranes • Cranes are primarily used for lifting, lowering, and transporting loads. • They move loads horizontally by swinging or traveling.

  7. 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.

  8. 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.

  9. Excavating and Lifting • Cranes

  10. 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.

  11. 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

  12. 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.

  13. Excavating and Lifting

  14. Excavating and Lifting

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