Key Technology of Construction and Control of"Ground Anchor to Self-anchor"of Self-anchoring Suspension Bridge
The main bridge of Dongjiangnan Tributary Harbor Bridge is a self-anchoring suspension bridge,which is located in the busy shipping area.The construction technology of beam first and cable later needs to be set up in the channel.The erection of the support will cause serious interference to the local channel management and the operation of upstream and downstream enterprises,and the risk of collision avoidance of the support in the water is large.In order to solve the navigation problem,the temporary anchorage is used to construct the self-anchoring suspension bridge first and then the beam,which realizes the construction of the self-anchoring suspension bridge without support method.The safe and convenient temporary anchorage system of the main cable is proposed.The light composite anchorage structure of the approach bridge foundation and the surrounding soil is adopted.The main cable anchorage control measures of pier beam consolidation,the cable strand slip control method of steel beam synchronous hoisting,graded loading and water bag weighting,and the control measures of suspender collision duct port ensure the safety of the system conversion of the main beam closure and the"ground anchor to self-anchor".At the same time,the inverted lifting process is adopted to solve the hoisting problem of the main beam of the large slope main cable.
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