Howrah bridge don't have but bolts

when ever we talk about kolkata the first thing comes in our mind is howrah bridge ,howrah bridge whole structure attached with rivets not with nuts and bolts ,when every anyone plan to go kolkata howrah bridge is the first destination to visit and howrah bridge comes in world top 10 bridge construstion and most of the bridge made with high-(related to stretching wire, etc.) mix/mixture (of metals) steel which supplied by tata steel which is india number one steel industry and the paint job cost to paint howrah bridge around 6.5 million and the paint used is around 26500 litres of paint ,now kolkata change howrah bridge name to famous poet of kolkata in west bengal ,they call Rabindra Setu as a name of poet rabindra nath tagore,but still they use to call howrah bridge