96 m 钢管混凝土系杆拱桥吊索张拉技术研究

摘要

With a total length of 96 m,the steel tube concrete tied-arch bridge has 13 pairs of slings,7 groups of different internal forces,among which the internal force of symmetry slings is the same,the internal force of adjacent sling will be changing constantly during tensioning.After the completion,each of the sling force must be in accordance with the calcula-tion results,or uneven force will lead to quality problems of the whole beam body.Combined with the engineering exam-ples,research is made on each of the sling force and tension sequence,then internal force value of the sling at each step is determined,and the tension method of double-control for one machine is adopted to ensure the simultaneous tensioning and the same force of symmetric slings.After detection,the sling force of the whole bridge finally matches with the calculation, thus the stability of the beam body is ensured.%96 m 钢管混凝土系杆拱桥，共13对吊索，7组不同内力，其中对称吊索内力相同，张拉过程中相邻吊索内力会不断变化，完成后每根吊索受力必须符合计算结果，否则受力不均会导致整个梁体出现质量问题。结合工程实践，对每根吊索受力情况、张拉顺序进行了研究，确定了每个步骤吊索内力数值，并采用一机双控的张拉方式，确保对称吊索同时张拉，受力相同，最后经过检测，全桥吊索受力与计算吻合，保证了梁体的稳定性。