Features Of Steel Bridge

Steel bridges, also known as prefabricated Bailey bridges, are used interchangeably in many places, and even the terms Bailey bridges and steel bridges are equated. Many websites directly put the steel bridge and the Bailey bridge on the title bar. Are they the same thing? Is there any difference? Strictly speaking, steel bridges ≠ Bailey bridges, steel bridges include steel bridges, and only prefabricated steel bridges = steel bridges. The steel bridge is defined by the manufacturing material. The main feature of the steel bridge is modularization, and the scope of the steel bridge is wider. Literally, it can be said that the main body of the bridge is a steel structure. Can be called a steel bridge. It's just that the steel bridge is more typical and the most widely used. Relatively speaking, the term prefabricated steel stool bridge is closer to the original meaning of steel stool bridge, and it can also be said to explain what a steel stool bridge is in another sense.

The steel bridge is made of high-strength steel as a lightweight standardized truss element and consists of beams, longitudinal beams, bridge decks, bridge seats and connectors. It can be quickly assembled on the spot with special installation equipment to be suitable for various spans and loads. Truss girder bridge. In the Second World War, it was used extensively in Europe and the Far East to repair bridges or set up temporary bridges. After the war, the Bailey Pin Bridge was improved and converted to civilian use. The improved version in the United States is named the Akroger bridge. China's highway department uses 16mn steel to design and name it as an assembled highway steel bridge. A set of equipment can erect one-way bridges with a span of 9, 12, 15...60, 63 meters. load on stage, track 50, trailer 80. Such bridge elements are also used extensively as construction supports or towers.

The connection method of the steel bridge is different from that of other bridges. So, what are its characteristics?

1. The advantage of steel bridge welding is that the steel can be easily used from any orientation, angle and shape. Generally, no additional connecting plates are required to connect the parts of the angle steel, and there is no need to open holes in the steel, so that the section is not weakened. .

2. Bolted connections can be divided into ordinary and high-strength bolted connections. Advantages, easy installation, especially suitable for site installation connections. The disadvantage is that it is necessary to open holes on the plates and align the holes when assembling, which increases the manufacturing workload; the bolt holes also weaken the cross-section, and the connected plates need to overlap each other or add angle steel or assembling plate connectors. scrap steel.

3. Rivet connection; rivets are usually made of ordinary carbon rivet steel ML2 or ML3 with good plasticity and upsetting properties, and the aperture is used as the nominal diameter of the rivet. Good plasticity, toughness and integrity, small connection deformation, reliable force transmission, good fatigue performance under load, and easy quality inspection. Disadvantages: complex structure, large amount of steel, troublesome construction, loud noise when rivets, and poor working conditions.

Steel bridges can be divided into girder bridges, arch bridges, steel bridges, cable-stayed bridges, suspension bridges, and hybrid system bridges according to the stress system of the main load-bearing structure.

1. Under the vertical load of the girder bridge, the section of the main girder only has bending moment and shear force, and no axial force is generated. The support only bears the vertical force and does not bear the horizontal force.

2. The biggest difference in the force of the arch bridge is that under the vertical load, in addition to the vertical reaction force, there is also a horizontal thrust at the supports at both ends of the arch, which greatly reduces the bending moment and shear force in the arch. , mainly under pressure.

3. The stress of steel structure bridge has some characteristics of girder bridge and arch bridge, and the main load-bearing structure is eccentric compression and bending.

4. Cable-stayed bridge, the cable is in tension, the beam is bent, and the tower is in compression.

5. Suspension bridge, the meeting of the suspension cables only bear the tension.

After reading the above analysis of the main characteristics of the steel stool bridge, do you think its function is very powerful? Don't you think it's taller all of a sudden? Is it full of admiration and gratitude for it? The steel bridge crosses the two banks and stands there day and night, just to ensure the safety of every passerby. For such a great steel bridge, should we pay tribute to it with a grateful heart?