Eng. Malek AbuwardaLecture 5 P1

Construction Methods

Lecture 5

Excavating and Lifting

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

Pipe jacking

Lecture 5 P3

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 Cranes

Lecture 5 P9

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

Eng. Malek Abuwarda

Excavating and Lifting

Lecture 5 P13

Eng. Malek Abuwarda

Excavating and Lifting

Lecture 5 P14