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Construction Tech Review | Tuesday, August 24, 2021
Different bridge construction methods must be used depending on the location and type of bridge.
FREMONT, CA: Bridges are an important part of civil engineering and a common aspect of the built environment. Whether flat, convex, or concave, the load-bearing structure determines the basic principles of bridge design. The height, ground conditions, and needed clear span will all influence the bridge design. The first stage in constructing a bridge is to lay the foundations. This procedure includes extensive geotechnical investigations of the bridge's foundation. The type of bridge foundation, such as the well foundation, pile foundation, or opened foundation, must be chosen. Each foundation is designed to work with unique soil strata and bridge features. The soil characteristics will determine the load-bearing capacity and other essential factors. Different bridge construction methods must be used depending on the location and type of bridge. Bridge construction can be done in a variety of ways, each of which is described below.
Precast bridge construction method
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The three sections of the precast bridge construction process are I beams and super Tee, segmental, and full span. Precast construction refers to the prefabrication of bridge members or segments at a place other than the job site, transportation to the job site, and installation there. In comparison to cast-in-place segmental bridges, precast segments provide several advantages. At the precasting yard, the segments can be cast under-regulated, plant-like conditions.
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This industrialized approach provides for easy segment quality monitoring before placement in the superstructure and saves money by reusing the precasting formwork. When the segments are still accessible from all sides before placement in the superstructure, surface finishing tasks like texturing, sandblasting, painting, and coating can be done on the ground level without scaffolding.
Cast In-Situ Bridge Construction Method
This approach calls for high-strength concrete and high-strength elements like wires, bars, and steel strands. A special jack had pulled the strands that had been passed through the concrete after the concrete had hardened, and the strands had been secured after receiving a pre-determined force. This technology offers various advantages, including lower direct costs, lower material costs, lower labor costs, lower rebar costs, and lower transportation expenses, as well as faster formwork.
Arch Bridge Construction Method
The abutments at each end of an arch bridge are designed like a curving arch. The bridge's weight and loads are partially transferred into a horizontal thrust restrained by the abutments on either side of the bridge. A viaduct (a long bridge) can be created out of a sequence of arches, although today's viaducts are usually made out of other, more cost-effective structures. Arch bridges can now be longer and have lower spans thanks to the development of these new materials. An arch bridge's load is transported outward along the curve of the arch to the supports at each end rather than being pushed straight down. At either end, the weight is transferred to the supports.
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