eng. malek abuwarda lecture 5 p1p1 construction methods lecture 5 excavating and lifting
TRANSCRIPT
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 P2
Eng. Malek Abuwarda
Excavating and Lifting Trenchless Technology
Horizontal earth boring
Lecture 5 P4
Eng. Malek Abuwarda
Excavating and Lifting Trenchless Technology
Microtunneling or utility tunneling
Repair and Rehabilitation of PipelinesThe relining of a pipelinePipe bursting
Lecture 5 P5
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 P6
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 P7
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 P8
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
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
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