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With the development of the city, the history of the city has changed on one side of the steel bridge and the river, and the river has become the center of the city. Therefore, during the flood season, urban flood control is a serious and urgent top priority. However, the construction of urban flood control and drainage projects lags behind the construction of other urban infrastructure. To ensure the healthy, stable, and sustainable development of urban economy, it is necessary to consider how to closely integrate the construction of urban flood control and drainage projects with urban development. According to the preliminary work of the completed urban flood control and drainage projects and the planned urban flood control projects, urban flood control projects are no longer simply embankment construction in the traditional sense, but should be closely integrated with the overall urban planning, urban transportation, urban tourism, urban environment, urban drainage and other related infrastructure to avoid redundant construction and resource waste as a comprehensive project.
Therefore, it is urgent to 'scientifically construct an urban flood control and drainage system', which requires support from policies, management, technology, and products, as well as extensive international cooperation and exchange to jointly explore solutions. Exchange experiences, learn from each other, and explore together from two aspects of urban flood control and drainage, promoting the establishment of a reasonable comprehensive urban flood prevention and control system, and further promoting sustainable urban development.
Steel bridges, also known as prefabricated Bailey bridges in general, are often used interchangeably in many places, and even equate Bailey bridges with steel bridges. Steel temporary bridges are only assembled. Steel bridges are defined by their manufacturing materials. The main feature of steel bridges is modularity, and the scope of steel bridges is wider. Literally speaking, bridges with steel structures as the main body can be called steel temporary bridges. However, steel bridges are more typical and widely used. Relatively speaking, the term 'steel bridge' is closer to 'steel bridge', which can be said to explain what a steel bridge is in another sense. The lightweight standardized truss unit components, crossbeams, longitudinal beams, bridge deck, bridge seat, and connectors of the steel bridge are all made of high-strength steel. Suitable for truss beam bridges of various spans and loads, it can be quickly assembled on-site using specialized installation equipment. During World War II, it was widely used on battlefields in Europe and the Far East to repair bridges or construct temporary bridges. After the war, Bailey Bridge was improved and converted to civilian use.
The connection method of the steel bridge is different from other bridges. So, what are its characteristics? The advantage of welding steel bridges is that it can easily use steel in any orientation, angle, and shape. Generally, connecting angle steel parts does not require attaching connecting plates or drilling holes in the steel to avoid weakening the cross-section. Bolt connections can be divided into ordinary bolt connections and high-strength bolt connections. Advantages, easy installation, especially suitable for on-site installation and connection. Disadvantage: During assembly, holes need to be drilled and aligned on the board, which increases the manufacturing workload; The bolt holes also weaken the cross-section, and the connected plates need to overlap with each other or additionally set angle steel or connectors and scrap steel. Rivet connection; Rivets are usually made of ordinary carbon rivet steel ML2 or ML3 with good plasticity and upsetting performance, and the nominal diameter of the rivet is determined by the aperture.
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