The Clamshell excavator are widely used for rehandling of material and for working in Limited space as in case of foundation trenches for pipelines, etc. It is also used for jobs that require fairly accurate dumping and disposal of material.

The investment cost to owner includes interest on money invested, taxes of all times, insurance premium and charges for storage. The rates of se items will vary from place to place, equipment to equipment and owner to owner.

It sometimes so happened that equipment is physically sound, but due to current development in modern technology, it becomes old fashioned and rate of its output becomes less than modern machinery.

As equipment becomes old, it may be possible to maintain quantity of production. But after a certain interval of time, re is mass effect on quality of production and at this stage, it will be advisable to replace equipment to maintain quality of production.

Portable Conveyors can be used on large projects to handle placements of concrete at different places simultaneously. A portable conveyor is a self-contained unit which can be readily moved without much difficulty.

Drifter is used for drilling vertical or horizontal holes. They are extensively used in tunnel work and y can drill holes of diameter up to about 120 mm. The cuttings can eir be removed by air or water.

The Feeder belt conveyors are operated over an easily installed track system so that feeder train can be retracted or extended without interrupting concrete placement. This conveyors are used to transport large volume of concrete.

The Diamond drill speeds vary depending upon manufacturer and type of diamond drill. When used properly, Diamond drill bit should never be hot. The drill bit should never be more than warm, to touch. If a bit becomes hot, it is an indication of inadequate lubrication, too fast a drill speed or too much pressure for specific material being drilled.

Flat wood bits are used to drill fairly large holes and y give a flat bottom hole, so are ideal where head of screw or bolt needs to be recessed into timber. Always use se bits before drilling clearance hole for Bolt.

The cable has a breaking strength of 2500 kN to 7000 kN and its Unit Weight is about 150 Newton to 500 Newton per metre length. The use of cable way is usually made in transport of concrete from one place to or.