涪陵乌江二桥铺装调整

涪陵乌江二桥铺装调整一、工程背景涪陵乌江二桥主梁施工已经完成，但主梁线型与设计有一定差距。主要表现在跨中主梁线型不平顺，在10米距离内高差达到了10厘米。如果仍采用原设计铺装方案，则不能保证主梁成桥后主梁线型平顺。应业主要求，对后期铺装进行调整，以保证涪陵乌江二桥建成后主梁线型平顺，并且确保全桥受力与设计基本一致。二、调整方法1、 总体思路涪陵乌江二桥铺装调整分为中跨和边跨两部分：中跨铺装调整以平顺为主，尽量减少增加的沥青混凝土铺装，以减少主梁内力的变化；边跨铺装调整与中跨接平顺，增加的沥青混凝土重量在边跨压重块里扣除。2、具体措施桥面铺装调整以中跨调整为主，根据施工单位测量的数量进行曲线拟合，并将调整值带入模型计算，由此得到最终成桥主梁线型。三、调整措施1、 主梁铺装厚度调整值（详见附表二）。2、 边跨压重块调整边跨压重调整后值主梁编号梁块压重(KN)压重混凝土体积(M3)主梁编号梁块压重(KN)压重混凝土体积(M3)主梁编号梁块压重(KN)压重混凝土体积(M3)H33167.64.1H15278.76.7L497.52.4H3264.41.6H14202.94.9L5160.13.9H3187.82.1H13172.04.2L6227.45.5H30121.32.9H12160.63.9L7211.35.1H29119.02.9H11155.63.8L8118.42.9H28123.93.0H10157.93.8L9257.46.2H27159.63.9H9168.34.1L10117.02.8H26425.110.3H8173.44.2L11299.07.2H25407.89.9H7132.53.2L12154.43.7H24334.78.1H6144.63.5L13514.412.5H23282.16.8H5144.83.5L14484.311.7H22227.55.5H4150.03.6L15407.39.9H2145.51.1H3166.04.0L16225.05.4H20207.65.0H225.00.6L17137.13.3H1978.41.9H1-54.5-1.3L1898.12.4H18236.15.7L1-23.3-0.6L1984.02.0H17120.42.9L27.90.2L20111.72.7H16281.66.8L398.72.4将边跨临时压重块置换为铁砂混凝土永久压重，铁砂混凝土容重取实验值41.4KN/m3，同时考虑边跨铺装层加厚对压重铁砂混凝土重量的影响。根据上表计算出每个节段铁砂混凝土体积，进行置换。边跨压重块置换与桥面铺装调整同时进行。压重块置换最多只能2个节段同时进行。3、 调整方法根据主梁铺装厚度调整值先将边跨需要进行铺装厚度增加的部分调整到位，再从桥塔位置向跨中位置铺装主梁中跨部分增加的铺装厚度，最后采用铺装设备完成全桥8厘米沥青混凝土的铺装工作。四、中跨铺装调平层对主梁及拉索的受力影响1、 中跨铺装厚度调整对斜拉索索力的影响主梁中跨铺装厚度变化引起的索力变化值拉索编号索力(kN)变化量(kN)所占百分比拉索编号索力(kN)变化量(kN)所占百分比H338323.31832.2H216116.9951.5H328125.91712.1H226616.6961.5H317747.91441.9H236343.9961.5H306789.91332.0H246603.6951.4H296630.71231.8H256578.4931.4H287188.01121.6H266572.7891.4H276996.41011.4H276492.4841.3H266861.4721.1H286397.2781.2H257095.8640.9H296278.1701.1H246956.3570.8H306005.0601.0H236538.9500.8H316022.4510.8H226642.3430.6H325960.5400.7H216185.7360.6H334530.8300.7H205735.4260.4L205408.51132.1H195482.0210.4L196819.61121.6H185690.2170.3L186346.31111.7H175414.9130.2L176297.31081.7H165534.1100.2L166351.51051.6H155805.570.1L156372.71011.6H145600.450.1L146247.7961.5H135519.830.0L136132.4911.5H125419.510.0L125882.0861.5H115264.800.0L115755.3681.2H105094.500.0L105410.4641.2H94936.300.0L95566.0601.1H84755.210.0L85335.9561.0H74542.320.0L75222.1450.9H64547.430.1L65084.5400.8H54425.050.1L54875.3340.7H44405.160.1L44601.8260.6H34294.280.2L34363.3160.4H24098.390.2L24547.350.1H14470.9130.3L14895.960.1H14931.0170.3L14508.8140.3H24079.990.2L24286.8140.3H33515.640.1L34499.1140.3H43738.220.1L44688.2150.3H53839.680.2L55000.8160.3H63734.7130.3L65307.4190.3H73762.5170.5L75514.9240.4H84104.9210.5L85518.8280.5H94512.0300.7L95665.0330.6H104676.5340.7L105534.5380.7H114672.0370.8L115991.1520.9H124867.9461.0L125995.6591.0H135027.2511.0L136460.6671.0H145152.2551.1L146697.4751.1H155235.4591.1L157034.41061.5H165193.0631.2L167173.91171.6H175318.4671.3L177003.61291.8H185803.8841.5L187594.71401.8H195700.6881.6L198012.01521.9H205830.2921.6L207035.51622.32、 主梁内力变化