In the case of a truss bridge, a post-tensioned slab bridge, or a box girder bridge the sections are often floated to the bridge and then lifted into place by cranes on barges or cranes sitting over piers.
The very good reason why the word communism is so commonly associated with these revolutionary, anti-liberal, anti-democratic Marxists is that political parties with communist in the name were pretty much invariably of that bent throughout the 20th century, whereas parties called socialist or social democrat or labor varied enormously in ideology.
Communism was an economic-political philosophy founded by Karl Marx and Friedrich Engels in the second half of the 19 th century. Marx and Engels met in 1844, and discovered that they had similar principles. In 1848 they wrote and published The Communist Manifesto..