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| Research on the Full Length Cantilever Casting Construction Scheme of Concrete T- type Rigid Bridge with High-steep Rock Slopes |
| SUN Da-bin |
| （China Railway Design Corporation, Tianjin 300142, China ） |
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Abstract Abstract：Research purposes： The cast-in-site section is commonly set at the end of the bridge, which constructed by cantilever casting method. It is far more difficult and costly to install the scaffold on the high-steep rock slopes, and the foundation treatment makes great impact on the environment. In order to solve those problems and continue to guide scheme design of similar bridge, a specific engineering of passenger dedicated railway is taken as the analysis object to make a deep research on the full length cantilever casting construction scheme. Research conclusions： (1) With the length decrease of the cast-in-place segments of the bridge end, the amount of the prestressed steels of the T-type rigid bridge tends to be larger, however, it has little influence on the creep deformation and the reaction force. (2) For prestressed concrete T-type rigid bridges, the cost decreases when the length of the cast-in-place segments decreases, and the rate of cost reduction will be accelerated if the slope is steeper. (3) Using the full length cantilever construction scheme can effectively avoid the impact of construction on the environment. (4) The research results can provide a valuable reference for the design of T-type rigid bridge with high-steep rock slopes or other conditions, which are difficult to erect the support, such as flyover and cross river bridge.
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Received: 15 November 2017
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2017, Vol. 34 
