Bridges are structures designed to overcome a certain barrier and intended to last for a long time. They must be quite strong and durable because of their exposure to difficult and harsh conditions .

Pre-stretched bridge beams with steel cables are produced by providing a slight deflection limitation whether stretch. In this way, bridge beam gets flexibility against to future coming vehicle loads. In prefabricated bridge beams concrete-strength and pre-tensioning technology are used to make it possible to cross large open areas easily Thus it provides an advantage.
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