Closure construction method of cable-stayed bridge
A construction method and technology for cable-stayed bridges, applied in the direction of bridges, bridge construction, erection/assembly of bridges, etc., can solve problems such as the influence of the internal force state of the completed bridge, large time, cost, etc., and achieve the effect of linearity and internal force satisfaction
Active Publication Date: 2013-07-24
天津市市政工程研究院
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Problems solved by technology
However, these measures often require a lot of time and cost, and have a certain impact on the internal force state of the bridge.
Method used
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[0025] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings. The following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.
[0026] A closing construction method of a cable-stayed bridge is based on the following theory: use the retrograde analysis method to simulate the closing state and guide the construction as shown in the figure below: After the beam section at the end of the largest cantilever is hoisted, the largest cantilever end corresponds to the stay cable Stretching to a certain cable force, so that under the action of the construction load in the closing stage, the calculated value of the internal force of the closing joint is 0; in the actual construction process, a construction process of secondly tensioning the outermost cable-stayed cables after closing is added, At this time, the unstressed cable length of the s...
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The invention relates to a closure construction method of a cable-stayed bridge. The closure construction method of the cable-stayed bridge is characterized by comprising the following steps that a deck crane moves forwards and arrives, and a cantilever end stay cable is secondly tensioned, so that an internal force calculation value of a closure seam is zero under the action of a construction load in a closure stage when the length of the stay cable in a theoretical reserve detachment model is equal to the length of the stay cable after the second tension. According to the closure construction method of the cable-stayed bridge, which is disclosed by the invention, closure error between theoretical reverse analysis and practical forward construction is eliminated by utilizing a second cable staying method; during construction, the self-weight of a crane and a reverse lifting force are taken as a weight to press down and close the cantilever end; and the engineering cost and time caused by construction processes of weight, cable regulation and the like in a traditional cable-stayed bridge closure process are reduced, and the line shape and the internal force of the bridge can be enabled to meet the design requirements.
Description
technical field [0001] The invention belongs to the field of bridge construction methods, in particular to a closing construction method of a cable-stayed bridge. Background technique [0002] The closing state is the largest and most dangerous state of the cantilever in the whole construction process of the cable-stayed bridge. The construction of the closing section of the main bridge is the last process of the main bridge penetration. The construction of the closing section is subject to temperature, cable force, self-weight of the beam section and temporary load Influenced by various factors, the quality of construction directly affects the stress state and service life of the entire structure, so the construction of the closing section is particularly important. Therefore, it is very important for cable-stayed bridges to quickly realize the closure of the whole bridge by using a safe and applicable method. [0003] At present, the analysis methods adopted for the closu...
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Inventor 孙运国何立忠邓鸣齐怀展闫燕红郑连生刘永亮谢春光胡惜亮
Owner 天津市市政工程研究院