Q4. When high-speed trains pass
each other, it's strongly
recommended that they should slow
themselves down. Why? जब हाई-स्पीड
ट्रेनें एक-दूसरे को पास करती हैं, तो यह दृढ़ता से
अनुशंसा करता है कि वे खुद को धीमा कर दें।
क्यों?
Answers
Explanation:
Conventional Railway Bridge are designed for a peak speed of 60–80 kilometres per hour. Uplift Force due to Buoyancy is a problem that railway face often. Basically, there would be a pair of spans on which the slippers are ‘laid' and rails fixed. Aircurrent from below can generate a buoyancy effect above certain speed. Therefore, aerodynamic threshold barriers are installed in the new generation of bridges. Incorporation of more and more lighter materials for fuel efficiency adversely alter the size to weight ratio, ie. boyant density of the coaches of the train considerably.
Beam bridges , also known as stringer bridges, are the simplest structural forms. Multispan plate girder bridge deck on concrete piers often used. Pillars may be concrete or cross beam steel pipes and H angler beams.
Truss bridges are one of the oldest types of modern bridges.The steel truss cantilever bridge was a major engineering breakthrough when first put into practice, as it can span distances of over 1,500 feet (460 m), and can be more easily constructed at difficult crossings.
Next generation of vertical locating pin and support ring, usually at or near to its center of gravity, about which the turning span can then pivot horizontally can be used for road and rail transport.
Engines weigh around 200 tons that the engine are not detailed unless the track are sabotaged or moves away by flood. Whereas, the coaches that weigh only 30 tons for general compartments and 45 tons for 3 tier ac sleeper. (Self gen. 2AC may weigh some 50 tons) has all suseptability to detail off a bridge.
Taking the minimum value of 30 tons (30,000 kgs) and a volume displacement of 3 metre wide, 4 metre tall and 23 metre long coach can an overall volume of around 276 sqm. Say around the density of water. Fixed air v/s moving water, the other way, air current at a speed of 100 km/h is near to the speed of tornado, the fastest one is 117.482 km/h.
Guard track runs in parallel in level cross (boundary for concrete) and bridges (at times wooden slippers used) to avoid rerailing. Bridges with supporting girders and or road bridge above railway provide side support). Height of bridge, Depth of water etc determine the impact of derailing resulting 30% to 90% casualty.
Linke Hofmann Busch (LHB) coaches are the passenger coaches of Indian railways.
New bridges incorporate Circular columns for stability. Elliptical RCC annular piller with internal lintels promote better citation and the structural as well as the hydronic maneuvering of river bridges.
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