Study Of Anti-Slipping Scheme For Double-Siding Steel Cofferdma Of The Fourth Pier In Apengjiang Bridge

Apengjiang Bridge, in the 20th contract sector of YuHuai Railway, is 343. 06m long. Its main span, which is 60m long, is made up of prestressed concrete continuous beam. The fourth pier, one of the main piers, adopts the compound foundation constituted with double-siding steel cofferdam and drilled shafts which stands on the deep-water and slopping river bed where geological condition is very complex, so the cofferdam has the trend of slippage. In order to ensure construction of the project efficiently, the questions above are studied and resolved. Works are accomplished as follows in this paper:Firstly, according to the real condition of the fourth pier, through analysis of several generally-used anti-slipping schemes, new method has been put forward to substitute anchored column pile with the foundation of drilled shafts so as to prevent cofferdam from slipping. Secondly, based on the theoretical analysis of the chosen anti-slipping scheme, anti-slipping stress test, strength test of sealed-cover concrete, anti-floating test of cofferdam, stress test of supporting pile and stress test of stability are processed respectively, which proves that the new scheme presented in this paper is feasible. Thirdly, according to the theoretical analysis and the stress test of the scheme, correlative construction technologies and controls are demonstrated and efficient scheme for construction is supposed, which ensure feasibility of the scheme.Results and achievements obtained in this paper has been applied to the real construction of Apengjiang Bridge, which not only speeds the project schedule but also economizes the project. And it has been made high praises by YuHuai railway construction headquarters for its great contributions to the whole construction.The scheme put forward in this paper which is briefly described above is reasonable and feasible in the practical project. Thereby, the research achievements obtained in this paper will play the referring and guiding roles for later similar projects.