BANGLADESH POWER DEVELOPMENT BOARD TENDER ... - BPDB

15.1.7 STRUCTURAL DESIGN(1) Bridge and End Truck FramesThe bridge structures shall be of welded construction, but with all fieldconnections designed for high-strength bolting. The various parts of the mainstructure of the crane shall be sub-assembled and the field connections reamed.The end truck frames shall be either one-piece steel castings or built-up structuralsteel members.(2) Trolley FrameThe trolley frame shall be fabricated from steel sections or cast steels and shall bedesigned to support the hoisting machinery.(3) Walkway and LaddersSteel safety tread walkways and ladders shall be provided to allow access to allparts of the crane for inspection, repairs and maintenance. Where required, crosswalkways shall be provided, connecting walkways on opposite sides of the crane.Walkways shall be at least 0.70 m wide and provided with a substantial toe-guardat least 0.10 m high and hand-railing not less than 1 m high over the entire lengthand ends. Ladders shall be provided where required for access between the walkwaysand operator's cab. The Contractor shall prepare access from the floor tothe operator’s cab.(4) Operator's cabAn operator's cab shall be located on each crane and in such a manner as to allowmaximum travel of the hooks and maximum visibility for the operator. The cabframe shall be fabricated from steel. All the enclosed walls of the cab shall be oftransparent material.The following controls shall be located inside of cab:a. Manually operated controllers and master switchesb. Main air circuit breakerc. Push - button switch for main contactord. Individual switches for lighting, warning signal, etc.e. Volt meter for power source15.1.8 ELECTRICAL DESIGNThe Contractor shall furnish and install all electrical equipment on the craneincluding all motors, electrically operated brakes, air circuit breakers, switches,contractors, controllers, resistors, control panels, relays, limit switches, trolleytravel conductors, current collectors, transformers, complete lighting system,receptacles, conduit, wiring, cabling, insulators, anchors and other electricalequipment necessary for the safe and proper operation and control of the crane.The Contractor shall also supply the main runway conductors, insulators, bracketsand associated accessories.Ghorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)133