Method for determining stranded stayed single cable initial tensioning force
A technology of single stay cable and steel strand, applied in tension measurement and other directions, can solve problems such as inaccuracy, and achieve the effect of high precision and equipment saving
Active Publication Date: 2011-09-07
CHINA MAJOR BRIDGE ENERGINEERING +1
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Problems solved by technology
However, this method is often not accurate enough, because the actual tension force of each steel strand is not equal, and the resulting displacement is also different. Therefore, it is generally necessary to use the overall jack to correct the entire cable force after the tension of a single strand is completed.
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Embodiment Construction
[0011] In the present invention, through the analysis of the installation and tension process of steel strand oblique cables, it can be found that in the process of steel strand tensioning one by one, the force of the installed and tensioned steel strand will increase with the subsequent tension of the steel strand. , the cable force gradually decreases. Since the tensioning sequence of each steel strand is different, in order to ensure that the cable force of each steel strand is equal at the end, the tension of each steel strand is just different when the tension is installed. However, it can be found through analysis that when the cable forces of all steel strands are equal after tensioning, the original dimensions of all steel strands are also equal. Because the original size will not change after the tension is installed, as long as the original size of each steel strand is equal to that at the end of the installation and tension, the cable force of all steel strands can ...
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A method for determining an initial tension of a single stranded wire of stranded wires stayed cable relates to the construction and mounting technique for stranded wires stayed cable of a stayed-cable bridge, the steps include 1) calculating geometric length, internal force and elastic elongation of the stayed cable after the overall stayed cable stretching, 2) subtracting the elastic elongationfrom the geometric length obtained in step 1 and getting an initial size of the stayed cable, 3) stretching a first stranded wire until the size thereof is equal to the initial size obtained in step 2), then calculating the cable force which is the tension of the first stranded wire, 4) determining tension force of others stranded wires of the stayed cable according to the same method in sequence. The method for determining an initial tension of a single stranded wire employing a structure analysis software to work out the tension of all the stranded wires, which is capable of considering impaction of the actual stiffness of the stayed cable bridge and considering influence of each stranded wire, thereby achieving high accuracy, and having no need to mount a transducer on the first stranded wire and to be adjusted by an overall jack after stretching a single stranded wire, and saving equipment.
Description
technical field [0001] The invention relates to the construction and installation technology of cable-stayed cables of steel strands of cable-stayed bridges. Background technique [0002] The cable-stayed bridge installation calculation determines that the cable force for the first tensioning of the cable-stayed cables is the cable force of the whole cable. For parallel steel wire cable-stayed cables, this cable force value is force value. But for parallel steel strand cable-stayed cables, since a whole cable is composed of several mutually independent steel strands, and each steel strand is hung one by one at the bridge site, the same cable-stayed In the cable, the steel strands installed later have the function of unloading the steel strands that have been hung. How to determine the tensile force of a single steel strand can ensure that after all the steel strands are hung, the tension of each steel strand is uniform and the total cable force is equal to the calculated c...
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IPC IPC(8): G01L5/04
Inventor 秦顺全黄晓航石建华
Owner CHINA MAJOR BRIDGE ENERGINEERING