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Eng. Malek Abuwarda Lecture 5 P1P1 Construction Methods Lecture 5 Excavating and Lifting
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Eng. Malek Abuwarda 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. Lecture 5 P2P2
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Eng. Malek Abuwarda Excavating and Lifting Trenchless Technology Pipe jacking Lecture 5 P3P3
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Eng. Malek Abuwarda Excavating and Lifting Trenchless Technology Horizontal earth boring Lecture 5 P4P4
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Eng. Malek Abuwarda Excavating and Lifting Trenchless Technology Microtunneling or utility tunneling Repair and Rehabilitation of Pipelines The relining of a pipeline Pipe bursting Lecture 5 P5P5
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Eng. Malek Abuwarda Excavating and Lifting Cranes Cranes are primarily used for lifting, lowering, and transporting loads. They move loads horizontally by swinging or traveling. Lecture 5 P6P6
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Eng. Malek Abuwarda 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. Lecture 5 P7P7
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Eng. Malek Abuwarda 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. Lecture 5 P8P8
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Eng. Malek Abuwarda Excavating and Lifting Cranes Lecture 5 P9P9
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Eng. Malek Abuwarda 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. Lecture 5 P10
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Eng. Malek Abuwarda 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 Lecture 5 P11
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Eng. Malek Abuwarda 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. Lecture 5 P12
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Eng. Malek Abuwarda Excavating and Lifting Lecture 5 P13
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Eng. Malek Abuwarda Excavating and Lifting Lecture 5 P14
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