In fact, it is not a "ornament", but mainly reserves the displacement distance of the bridge itself caused by changes in external factors. For example, to prevent secondary accidents caused by falling bridge decks during earthquakes, typhoons or impacts.
Not only to save land, but also to ensure the smoothness of high-speed rail tracks, especially in areas with a lot of rainfall.
In order to ensure structural safety
Simply put, vehiclesTotal weight*40 tons, which meets the total weight requirements, butonly 2 axles, 20 tons on a single axle, and even more than 20 tons on the rear axle.Localload+Beyond the design range, the bridge may collapse.
What the subject said should be this kind of prefabricated box girder in the picture below.
As the main bridge type of highway traffic construction in our country, simple support T-beam bridge has become the most widely used prefabricated bridge structure by virtue of its simple structure, convenient construction and clear stress. Its standardized design significantly improves construction efficiency, and the main beams are connected by 4~6 meters spacing transverse beams, which reduces the difficulty of construction while ensuring integrity. This bridge type has significant economic advantages within the span range of 10~25 meters (reinforced concrete beams 10~16 meters, prestressed concrete beams can reach 25 meters), and provides important support for the construction of our country's road network.
Westcoast New Area, Qingdao City ,Shandong Province ,China
