| High-detail low-impact tower crane 3D model. Part of a huge linked collection available from ES3DStudios. Ideal for games, sims or pre-render work. This set is also available as part of large-scale city scenes. Range of characters and vehicles also available. Many more linked sets available from ES3DStudios in all common 3D formats. Click 'ES3DStudios' for full sellection. *******************************************
Textures contained in 2nd zip download.
******************************************* Tower cranes are a modern form of earlier balance cranes. Fixed to the ground - sometimes attached to the sides of structures as well, tower cranes often give the best combination of height and lifting capacity and are used in the construction of tall buildings. The jib ('boom') and counter-jib are mounted to the turntable, where the slewing bearing and slewing machinery are located. The counter-jib carries a counterweight, usually of concrete blocks, while the jib suspends the load from the trolley. The Hoist motor and transmissions are located on the mechanical deck on the counter-jib, while the trolley motor is located on the jib. The crane operator either sits in a cabin at the top of the tower or controls the crane by radio remote control from the ground. In the first case the operator's cabin is most usually located at the top of the tower attached to the turntable, but can be mounted on the jib, or partway down the tower. The lifting hook is operated by using electric motors to manipulate wire rope cables through a system of sheaves. In order to hook and unhook the loads, the operator usually works in conjunction with a signaller (known as a 'rigger' or 'swamper'). They are most often in radio contact, and always use hand signals. The rigger directs the schedule of lifts for the crane, and is responsible for the safety of the rigging and loads. A tower crane is usually assembled by a telescopic jib (mobile) crane of greater reach and in the case of tower cranes that have risen while constructing very tall skyscrapers, a smaller crane (or derrick) will often be lifted to the roof of the completed tower to dismantle the tower crane afterwards. It is often claimed that a large fraction of the tower cranes in the world are in use in Dubai. The exact percentage remains open. ------
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