Bridges are one of the most important and useful steel structures in cities or outside the city. That is why their construction is important and structures must be constructed with up-to-date methods. Bridges should be noted for their architecture and appearance. It is necessary to build bridges with beautiful architecture and structure to help beautify urban spaces.
The use of steel in the construction of steel bridges began in the last century and has become widely accepted due to the optimum tensile and compressive strength of these materials. Due to the high cost of production, steel profiles are usually of poor thickness and therefore, in addition to rust and corrosion, the risk of elastic instabilities is always present, on the other hand, as the span length of the bridge dead weight increases rapidly due to the small size of the dimensions and therefore the lightweight metal sections, they are still used for large openings.
Also, steel materials can always be used when the issue of temporary or removable bridges is in question or the time required to assemble and prepare bridges is short.
Considering above mentioned issues, it is always necessary to control the stability of the sections and regular visit of built bridges and proper maintenance procedures is always important.
Steel bridges cover: Steel bridges can be selected from reinforced concrete rock material or from steel sheets. The use of wood to cover bridges has been common in ancient times but is rarely used today. Also in the new designs, the stone cover is less used because of its high weight
In this solution, the bridge's longitudinal beams are connected by arches of brick and stone.
Reinforced concrete cover:
The cover consists of a reinforced concrete slab that rests on longitudinal joists and transverse bridge beams. Reinforced concrete coatings provide the required strength and rigidity and are easy to use and very practical.
One type of this covers composed of a series of metal plates coated with reinforced concrete and welded to the upper wing of the longitudinal joist. The overall thickness is usually weak (between 10 and 20 cm).
Another common type of metal covers are Orthotropic deck that is composed by a plate that is vertically reinforced by plain or box-reinforced sheets, the metal cover have the role of upper beam wings and While participating in bending resistance, it can withstand local loads caused by run wheels.
The Orthotropic deck generally rests on the main components of the bridge (longitudinal and transverse beams).
Construction of bridge structures
Like other structures, bridge structures are made in different stages:Bridge design, which is the initial stage of bridge construction and its carried out by designers and structural engineers, it's considered to be an important step because if there is a defect in this stage the construction and installation of the bridge will have large and major damages. That's why it is important to find expertised and experience people to do this.
Steel structures for bridges
Bridges that are standardized and engineered to the highest standards have higher efficiency and quality and also made in a shorter period of time and have a lower construction cost. The design of the bridge, depending on its type of use (pedestrian bridges, nature bridges, car bridges, etc.) will have different dimensions. The construction of bridges is carried out in the manufacturing complexes and then installed, the construction of bridges is also of great importance and is carried out under the direct supervision of engineers and employers.
The cost of making metal bridges is high, but Partogaran San’at Khayyam, a manufacturer of metal bridges, can reduce costs by using techniques.