Page 49 - Built Expressions - Online Construction Magazine - November 2014 Issue

Cover Feature The operator rides in a cab at the Tower cranes now-a-days are sophisticated items of intersection of the jib and tower. construction equipment, requiring detailed planning in Hammerhead cranes typically procurement and utilization. require a second crane to assemble and disassemble them at the worksite. Self-lifting hammerhead cranes can insert and remove sections to their tower and change • Side Lift Cranes buildings, tower cranes can route their height. • All terrain cranes through the elevator shaft, further • Crawler Cranes easing space requirements. Tower • Self-Erecting Tower Cranes- A • Floating Cranes cranes are available in several common self-erecting crane can completely • Loader Cranes types, each with its own advantages. assemble itself at the job site without • Tower Cranes Tower cranes now-a-days are the need for a second crane. This • Lifting Hoists sophisticated items of construction provides an advantage in setup time equipment, requiring detailed planning and equipment costs. While some Tower Cranes in procurement and utilization. They versions have an operator cab on India is witnessing construction of a are electrically operated and come with the jib, self-erecting cranes are often large number of high rise structures wide variety of options both in terms of remote-controlled from the ground. including Tall Buildings, Power Station working range, jib arrangement, mass Self-erecting cranes are usually chimneys, Natural Draught Cooling confguration etc. Some aspects of the freestanding, and can be equipped to Towers, Elevator Towers and the list various issues are now dealt with in the move around the job site. Some self- goes on. The use of Tower Cranes in paper. lifting cranes also have a telescoping all such cases becomes an absolute tower, which allows the crane to necessity. While some Tower Cranes Types of Tower Cranes work at multiple heights without are being manufactured and assembled • Hammerhead Crane - A reconfguring the tower. in India, cranes to serve the upper end hammerhead crane is the most of the construction spectrum are still common and often associated with • Luffng Jib Tower Crane- In tight being imported. a tower crane. A long horizontal jib urban work spaces, there is often Tower Cranes are being is attached to a vertical tower. One insuffcient clearance for the jib to extensively used for material handling end of the jib extends horizontally rotate without being blocked by and concreting. Theirconfguration over the worksite, while the other existing buildings. For such spaces, offers several advantages over more end has a counterweight. A trolley, a luffng jib tower crane is used. traditional cranes, including reduced which holds the lifting cable, While most tower cranes have a fxed space requirements, higher vertical travels along the length of the jib, horizontal jib, the operator can raise lift, increased capacities and quiet and a tower crane can operate or lower a luffng jib to allow the electrical operation. In high-rise anywhere within the jib's radius. crane to swing in a reduced radius. Vol: 3 Issue: 11 November 2014 Built Expressions PG 49