Construction method for replacing old frame bridge by new frame bridge in existing railway lines
A technology of existing railways and construction methods, applied in the erection/assembly of bridges, bridges, bridge maintenance, etc., can solve the problems of difficult application for blasting operations, difficult control of blasting quality, and large impact on the surrounding environment, shortening the construction period and facilitating construction. Simple, low construction cost
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[0032] The construction method for converting a new frame bridge under an existing railway line into an old frame bridge provided by the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0033] Such as Figure 1-8 As shown, the construction method that the new frame bridge under the existing railway line provided by the invention replaces the old frame bridge comprises the following steps carried out in order:
[0034] 1) Calculate the jacking force required by the old frame bridge 1 according to the formula, and according to the calculation results, the number, type and size of the jacking columns 44, 54 and jacking picks 45, 55, the old bridge's rear supplementary triangular block 42 and the corbel 41 Reinforcement rate is designed;
[0035] The formula for calculating the top force of the old frame bridge: P=K[N 1 f 1 +(N 1 +N 2 ) f 2 +2Ef 3 +RA]
[0036] In the formula: N 1 f 1 ——Top surf...
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