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The key technology about maintenance and reinforcement for Important Historical Monuments under Special Preservation of Lanzhou Yellow River Steel Bridge

time : 2019-03-16Author : 马小云

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Innovations: (1) Based on the concepts of relic protection and bridge usability enhancement, to respond the needs of flood control grade and seismic capacity of the key cultural relics site under the state protection, Lanzhou Yellow River Iron Bridge, the basic principles and implementation plans of antique bridge maintenance and reinforcement, "repair as it was" and "landscape coordination", were put forward. (2) In the situation of shallow but strong current, the new technology of reinforcement of existing bridge was developed; with the help of pier guide frame, under complex conditions, the complete set of design-construction technology that, in the state of suspending, assembling the steel cofferdam of the antique bridge at the external of the pier was put forward. The construction technology of installing double-walled steel cofferdam and compound cofferdam, “excavate the pebble riverbed at external of the bridge pier before sinking”, was developed; the "sand and gravel dredger" was developed for excavating sand and gravel in the river with shallow but strong current. The reinforcement construction technologies of constructing seismic work and durability work of antique piers and constructing the work of maintaining the appearance of relics, under complex conditions, were also formed. (3) By the experiment of steel impact toughness, fatigue crack growth rate and riveted detail fatigue of Lanzhou Yellow River Iron Bridge, the fatigue crack performance evaluation index of antique steel bridge was confirmed; based on the boundary conditions of construction, the carrying capacity and seismic safety evaluation models of antique bridge were built and its remaining life evaluation method was also formed. (4) The synchronous lift technical system, technology and control methods of multi-span steel bridge were studied and established. 

Innovations: (1) Based on the concepts of relic protection and bridge usability enhancement, to respond the needs of flood control grade and seismic capacity of the key cultural relics site under the state protection, Lanzhou Yellow River Iron Bridge, the basic principles and implementation plans of antique bridge maintenance and reinforcement, "repair as it was" and "landscape coordination", were put forward. (2) In the situation of shallow but strong current, the new technology of reinforcement of existing bridge was developed; with the help of pier guide frame, under complex conditions, the complete set of design-construction technology that, in the state of suspending, assembling the steel cofferdam of the antique bridge at the external of the pier was put forward. The construction technology of installing double-walled steel cofferdam and compound cofferdam, “excavate the pebble riverbed at external of the bridge pier before sinking”, was developed; the "sand and gravel dredger" was developed for excavating sand and gravel in the river with shallow but strong current. The reinforcement construction technologies of constructing seismic work and durability work of antique piers and constructing the work of maintaining the appearance of relics, under complex conditions, were also formed. (3) By the experiment of steel impact toughness, fatigue crack growth rate and riveted detail fatigue of Lanzhou Yellow River Iron Bridge, the fatigue crack performance evaluation index of antique steel bridge was confirmed; based on the boundary conditions of construction, the carrying capacity and seismic safety evaluation models of antique bridge were built and its remaining life evaluation method was also formed. (4) The synchronous lift technical system, technology and control methods of multi-span steel bridge were studied and established. 

Progressiveness: International advanced level in general, international leading level in partial.

Technical features: (1) The lift synchronization accuracy of the whole 5-span steel bridge reached 2mm, safe and undamaged. (2) The difficulties of seismic reinforcement work in the cofferdam of small clearance of antique bridge pier were solved for the first time. (3) The difficulties of remaining life and service safety evaluation of antique bridge were solved for the first time. (4) Strong versatility and adaptability. 

Application cases: The research achievements are successfully applied in the following projects: the maintenance and reinforcement project of Lanzhou Yellow River Iron Bridge; Pile cap reinforcement project of super large bridge in Xixi county, Zhangzhou; Pile foundation reinforcement project super large bridge in Songhua river, Songyuan; Demolition project of Guanlan river bridge; Bridge-jacking reconstruction project in second ring road of Chengdu, and so on. 


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