कसरी बनाइन्छ समुन्द्रमाथि सयाैँ मिटर लामाे पुल ? How bridges are built over water? 10xt Nepal 

कसरी बनाइन्छ समुन्द्रमाथि सयाैँ मिटर लामाे पुल ? How bridges are built over water? 10xt Nepal
How Are Bridges Built? How bridges are built over water?
For most bridges built over deep water, construction crews must build cofferdams or lower caissons into the water to create a dam and platform for the concrete towers to stand on. Lakes and riverbeds can be unstable, so crews may need to drive piles deep into the earth to achieve stability.
-Cassion Foundation Installation.
-cofferdams
-bored piles
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