Bridge Erected Span-By-Span Thesis

Design of the bearing is very simple and it is based on trial and error method.Following criteria are considered during design of the bearings.The detailed dimension of temporary bearing used at Arial Kha Bridge is shown in Figure 1. Production and Application Production of temporary bearings is very simple and it can be done in construction site.

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b) Thickness of the steel plate was selected by trial method using the compressive strength test for the design load on the bearing.Height of the body is selected considering the adjustable height and elevation of the fixed bearing pad at different location.5) Thickness of the steel plates: Thickness of the steel plates for cylindrical body and base plate is determined by trial and error method considering the total design load on a single temporary bearing.The performance of temporary bearings in this method is crucial.Temporary bearings must have sufficient strength, rigidity, stability and ease of disassembly.A valve is set at the bottom part through which sand can be taken out from the cylinder during removal of the bearings.The temporary bearing is placed against the fixed bearing pad (as shown in Figure 2) and the height is adjusted according to the design elevation.When the temporary bearing is removed, the beam body can be uniformly and stably placed on the fixed bearing pad.Using this method, construction of the bridge is very smooth and speedy compared to the present practice which has been proved in construction of Arial Kha Bridge. Design and Calculation Temporary bearing generally consists of two hollow cylindrical body connected with a base plate at the bottom.Cylindrical body is connected with the base plate by continuous welding at both sides of the cylindrical steel body.6) For Arial Kha bridge, the temporary bearings were designed considering the following data: a) Weight of each girder = 200 tons and two temporary bearings were taken at each end under the girder.

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