Page 51 - Built Expressions - Online Construction Magazine - November 2014 Issue

Cover Feature overhead-cranehoist.com • Reversing Drum mixers- These are used in larger work. This machine comprises of two sets of blades, one blade mixes while drum is rotated while the other discharges the mix when drum is rotated in reverse. • Roller Pan Mixer- These are used for mortar mixing in general. The roller and mixing blades rotate in a pan and not only mix the material but also produce a kneading and crushing action. The drive to the rollers and mixing blade is provided by either diesel engine or electric over head or Gantry Cranes motor. • Transit Mixers- Concrete mixed A disadvantage when the lift shaft • Hand fed tilting mixers- These is transported from the batching is used is that the lift installation are the smaller capacity mixers. and mixing plant to site. Fully or is delayed pending removal of the Aggregate, cement and water are fed partly mixed concrete is transported crane. However, it is possible to into the drum by hand. The revolving through truck mixers, when construct the lift lining and assemble drum with its mixing blades gives a the construction site is far from from the bottom up, following the lifting, combing and agitation to mix batching plant. Entire mixing is passage of the crane. the concrete. carried in journey. Addition of admixtures helps concrete not to Over head or Gantry Cranes • Loader fed tilting drum mixer- set due to delays in transportation. These cranes are generally used These mixers are of larger capacity However, concrete thus mixed and involving large span service areas and as compared to the fed tilting drum carried should be used within 3 hrs are free from foor obstructions. They mixers. Mixer is ftted with a loading preferably. are widely used in erection, foundry, hopper operated by rope. Mixing steel plants, storage yards and different drum is supported on solid iron yoke types of industrial works. These type of and can tilt either side. cranes consist of two main parts i.e., the bridge and the crab. The bridge consists of two main girders fxed at their end to end and capable of moving on gantry rails. The crab consists of the hoisting gear mounted on a frame. The frame itself is mounted on another set of wheels and capable of travelling across the main girder. 10. Concrete Equipment The role of concrete equipment plays a very vital role in the construction industry and they vary from simple 10/7 mixers to complicated, computerized batching plants. Concrete production involves batching, mixing, handling nf-concrete-batching-plant.com and transportation, placing, fnishing curing as per the desired specifcations. Vol: 3 Issue: 11 November 2014 Built Expressions PG 51