Piyush Tiwari | Abhay Kumar Jha | Barun Kumar "Analysis and Design of Box Underpass Bridge Using Software" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-6, October 2021, URL: Paper URL : The structures have many advantages that are useful in freeway and bridge construction, including structural efficiency, serviceability. These days, box type bridges are becoming more popular in modern highway systems, including urban interchanges, because of their efficient dispersal of congested traffic, their economic considerations, and their aesthetic appeal. Innovative and cost effective structural systems have replaced conventional bridges. Recent technological advancements have made conventional bridges obsolete. It provides passage over obstructions without closing off the path below. As part of the modern world, bridge construction has come to be considered of international importance. To maintain traffic flow, numerous new highways and flyovers have been built. It is extremely expensive to construct.In the last few decades, there has been an enormous increase in traffic volume on highways due to population growth and rapid urbanization.There is a lower chance of survival in accidents since the vehicle is at a height. Though the accident risk is reduced, the damage will be significant, if one does happen.They typically require a large space thus built-up environments are not good for them.The following are the disadvantages of using a flyover: Provides space for emergency vehicles to move quickly.Reduces travel time due to less congestion.The following are the advantages of using a flyover: Fig 8: Concrete Flyover Advantages of Flyover Bridge Concrete flyovers are further divided into precast and cast in-situ concrete flyovers. Concrete FlyoverĬoncrete is the main component used to construct concrete flyovers with steel. ![]() Because it is comprised of steel, fluctuations in temperature might cause issues with expansion and contraction as a result, the steel should be coated or galvanized to prevent these issues. This kind of flyover is more cost-effective than the composite and concrete flyovers. Steel flyovers are those which use steel as their primary structural material. Steel girders may be rolled steel joists (like ISMB, ISWB, ISHB) for short spans up to about 10 m or plate girders (built-up beams) for longer spans. The strength of both RCC and steel together contributes to the strength of a composite flyover. Composite FlyoverĪ composite flyover is a combination of both RCC and steel elements acting together. Fig 5: Underpass Flyover Classification of Flyovers based on Material 1. Both flyovers improve traffic control, which immediately lowers the accident rate. An underpass flyover is often built to allow cars and people to pass without disrupting the railroad and road. Underpass FlyoverĪn underpass flyover crosses over an existing railroad crossing, road, or other obstacles underneath. The primary purpose of an overpass flyover is to keep other traffic away from the railway path (i.e., vehicle and pedestrian traffic). Overpass FlyoverĪn overpass flyover is one that is built over an existing highway or railway line that crosses over barriers. Fig 3: Cloverleaf Flyover Classification of Flyover based on Form 1. Since there is no need to weave or slow down, this offers an advantage over the simple flyover. In this kind of flyover, the grade separation technique allows traffic from one or more roads to pass the junction without directly crossing it or interfering with the flow of other traffic streams. Cloverleaf FlyoversĬloverleaf flyover is a form of grade separator as well. This type of highway is used for fast-moving traffic to cross railway lines or heavy vehicular junctions. This particular flyover is the one that is used the most often. The two types of flyovers used for traffic management are: 1. Whereas a flyover is constructed to connect two points in congested areas, such as roads and highway intersections. Fig 1: Flyover under constructionĪ bridge and a flyover differ from one another depending on how they will be used and where they will be constructed.īridges are constructed to link two separate locations these locations may be found naturally in places like valleys, rivers, seas, or other water bodies. ![]() ![]() A road, highway, or railroad may be required for the passage. In order to prevent traffic congestion below, flyovers are constructed to allow for safe passage over obstacles. A flyover is a high-level road bridge that crosses over another railroad or highway intersection or an existing road.
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