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1、赣江特大桥13#、14#挂篮预压沉降观测分析总结报告一、 预压目的为了确保挂篮施工安全,减少挂篮的非弹性变形,获取弹性变形参数,得出压重与挂篮本身的变形关系,为挂篮施工和线性控制提供挂篮弹性挠度计算的可靠依据,保证施工质量和安全,对挂篮进行加载试验检验,消除整个挂篮的塑性变形,测量出挂篮的弹性变形。二、 预压方法a、预压加载按照加压荷载的0%、20%、40%、60%、80%、100%、110%进行,布载截面形式应模拟梁体荷载分布。加载顺序尽可能模拟混凝土浇筑顺序。在加载前0%时先进行测量,第一次加载箱梁底板及腹板处,加载至20%,依次40%、60%、80%、100%、,加载至110%,采用1m
2、1m0.62m类型混凝土预制块231块。具体加载顺序详见荷载布置断面图。b、采用水准仪测量,分别测量加载前读数。加载时,按照加压荷载的0%、20%、40%、60%、80%、100%、110%分级进行,加载完成后观测记录,直至最后的平均沉降值2mm并满足24小时以上时方可卸载。然后逐级卸载至100%、80%、60%、40%、20%、0%。待总体沉降量稳定后,最后再测量一次卸载后读数。c、在压载过程中采用水准仪实施全天候跟踪观测挂篮的变形情况并作好记录,待挂篮不再发生沉降,预压过程即告结束。在进行压载施工中,要边进行压载,边观测挂篮的变形情况,发现异常应立即停止压载作业,及时查找原因,处理正常后再
3、进行压载。d、挂篮标高调整：架体预压前,挂篮按照设计标高调整,通过预压,观测计算得出挂篮弹性变形数值,调整梁底标高。梁底标高=设计梁底标高+挂篮弹性变形值+设计预拱度。挂篮预制块纵面布置图三、 预压过程表1 跨赣江特大桥13#墩挂篮预压记录表序号日 期时 间施工情况备 注12017.10.188:00-8:30加载前22017.10.188:30-9:40加载至2032017.10.1811:45-14:00加载至4042017.10.1816:00-17:20加载至6052017.10.196:30-8:20加载至8062017.10.1910:20-11:25加载至10072017.10.
4、1913:00-13:35加载至11082017.10.2015:35-16:10卸载至10092017.10.2018:10-18:50卸载至80102017.10.216:30-7:35卸载至60112017.10.2110:20-11:25卸载至40122017.10.2113:00-14:35卸载至20132017.10.2116:50-18:10卸载至0表2 跨赣江特大桥14#墩挂篮预压记录表序号日 期时 间施工情况备 注12017.10.1713:00-13:30加载前22017.10.1716:35-17:20加载至2032017.10.187:00-7:35加载至4042017
5、.10.1810:00-10:25加载至6052017.10.1814:00-14:35加载至8062017.10.1818:15-18:40加载至10072017.10.198:35-9:16加载至11082017.10.209:15-9:45卸载至10092017.10.2013:00-13:32卸载至80102017.10.2017:20-17:50卸载至60112017.10.219:40-10:06卸载至40122017.10.2117:31-17:58卸载至20132017.10.228:10-8:35卸载至0四、 预压结果汇总表1 预压结果汇总墩 号平均弹性变形13# 15 mm
6、14# 13 mm五、成果应用本次观测较真实模拟箱梁施工的加载过程,达到了预压目的,验证了该挂篮结构的设计满足安全和质量要求。本次预压所得数据能够指导施工,预压结果合格,满足规及设计要求.可运用该挂篮进行13#、14#主墩连续梁现浇施工。根据设计图纸,设计只提拱了成桥后预拱度,在挂篮施工过程中。还要考虑挂篮变形的因素。因此,施工预拱度为挂篮弹性变形值+设计预拱度,则：对于已预压的挂篮,根据如下公式调整底模标高：底模顶面标高=梁底设计标高+设计预拱度1.5cm+弹性变形即13#底膜顶面标高=62.312+0.015+0.015=62.342 14#底膜顶面标高=62.312+0.013+0.01
7、5=62.340后附表：预压结果表格附件1:沉降观测点横断面示意图附件2:底版预压观测点平面布置图梁端小里程1桥墩 13#中心桥墩 1梁端大里程75 572288339946 641010图1 13#墩底板和上横梁预压观测点平面布置图梁端小里程1桥墩 14#中心桥墩 1梁端大里程75 572288339946 641010图2 14#墩底板和上横梁预压观测点平面布置图附件3:挂篮沉降监测表表1 跨赣江特大桥13#墩挂篮预压沉降观测数据记录表序号编号布点位置加荷载前荷载20荷载40荷载60荷载80荷载100荷载110卸载100%卸载80%卸载60%卸载40%卸载20%卸载后弹性形变mm塑性形变m
8、m0小时12小时24小时11大里程端61.6719 61.6711 61.6599 61.6519 61.6479 61.6419 61.6389 61.6375 61.6379 61.6399 61.6435 61.6476 61.6509 61.6545 61.6579 18 14 2261.6539 61.6530 61.6389 61.6339 61.6289 61.6259 61.6219 61.6219 61.6219 61.6239 61.6273 61.6305 61.6344 61.6377 61.6409 17 13 3361.6289 61.6281 61.6169 61
9、.6119 61.6019 61.5999 61.5979 61.5976 61.5979 61.5989 61.6021 61.6054 61.6085 61.6118 61.6149 16 14 4461.6019 61.6012 61.5879 61.5799 61.5759 61.5739 61.5710 61.5709 61.5709 61.5739 61.5763 61.5786 61.5814 61.5837 61.5859 12 16 5561.9889 61.9876 61.9739 61.9709 61.9699 61.9679 61.9645 61.9645 61.964
10、5 61.9669 61.9685 61.9704 61.9715 61.9736 61.9749 8 14 6661.9819 61.9813 61.9719 61.9669 61.9639 61.9609 61.9575 61.9576 61.9576 61.9599 61.9619 61.9636 61.9659 61.9677 61.9699 10 12 7772.6348 72.6336 72.6158 72.6088 72.6048 72.5998 72.5976 72.5977 72.5976 72.5998 72.6030 72.6064 72.6094 72.6124 72.
11、6158 16 19 8872.6278 72.6268 72.6168 72.6118 72.6058 72.5976 72.5925 72.5928 72.5925 72.5958 72.5996 72.6036 72.6072 72.6112 72.6148 19 13 9972.6088 72.6078 72.5958 72.5928 72.5888 72.5839 72.5801 72.5803 72.5801 72.5818 72.5848 72.5875 72.5908 72.5936 72.5968 15 12 101072.5998 72.5991 72.5868 72.58
12、18 72.5778 72.5746 72.5703 72.5703 72.5703 72.5728 72.5756 72.5781 72.5812 72.5844 72.5868 14 13 111小里程端61.9279 61.9271 61.9149 61.9099 61.9049 61.8998 61.8962 61.8962 61.8962 61.8989 61.9025 61.9063 61.9097 61.9135 61.9169 18 11 12261.9389 61.9382 61.9259 61.9189 61.9149 61.9129 61.9087 61.9087 61.
13、9087 61.9109 61.9135 61.9161 61.9187 61.9214 61.9239 13 15 13361.9209 61.9200 61.9019 61.8959 61.8889 61.8849 61.8824 61.8826 61.8824 61.8849 61.8887 61.8925 61.8963 61.9003 61.9039 19 17 14461.9179 61.9179 61.9019 61.8959 61.8909 61.8909 61.8865 61.8867 61.8865 61.8889 61.8919 61.8945 61.8979 61.90
14、09 61.9039 15 14 15561.9979 61.9968 61.9809 61.9779 61.9759 61.9727 61.9689 61.9689 61.9689 61.9709 61.9735 61.9763 61.9787 61.9815 61.9839 13 14 16661.9889 61.9882 61.9769 61.9719 61.9699 61.9675 61.9648 61.9646 61.9647 61.9669 61.9687 61.9707 61.9726 61.9743 61.9759 9 13 17772.6428 72.6422 72.6278
15、 72.6198 72.6128 72.6096 72.6064 72.6064 72.6064 72.6098 72.6136 72.6176 72.6212 72.6252 72.6288 19 14 18872.6468 72.6460 72.6338 72.6298 72.6218 72.6138 72.6104 72.6105 72.6103 72.6128 72.6158 72.6186 72.6218 72.6246 72.6278 15 19 19972.6328 72.6321 72.6148 72.6088 72.6038 72.5998 72.5975 72.5974 7
16、2.5973 72.5998 72.6034 72.6072 72.6104 72.6144 72.6178 18 15 201072.6248 72.6240 72.6108 72.5978 72.5928 72.5897 72.5816 72.5863 72.5865 72.5888 72.5926 72.5966 72.6006 72.6042 72.6078 19 17 表2 跨赣江特大桥14#墩挂篮预压沉降观测数据记录序号编号布点位置加荷载前荷载20荷载40荷载60荷载80荷载100 荷载110卸载100%卸载80%卸载60%卸载40%卸载20%卸载后弹性形变mm塑性形变mm0小时1
17、2小时24小时11大里程端41.281 41.275 41.273 41.270 41.270 41.265 41.263 41.263 41.262 41.264 41.271 41.271 41.271 41.271 41.272 8 9 2241.295 41.290 41.287 41.282 41.282 41.279 41.278 41.277 41.276 41.279 41.282 41.282 41.288 41.290 41.289 10 6 3341.294 41.289 41.286 41.282 41.280 41.279 41.277 41.277 41.276 4
18、1.278 41.279 41.280 41.284 41.286 41.289 11 5 4441.238 41.235 41.232 41.226 41.224 41.222 41.221 41.221 41.221 41.221 41.222 41.223 41.223 41.224 41.226 5 12 5541.258 41.254 41.251 41.247 41.244 41.244 41.235 41.234 41.234 41.235 41.242 41.242 41.243 41.243 41.244 9 14 6641.269 41.262 41.260 41.258
19、41.254 41.252 41.246 41.246 41.245 41.246 41.246 41.242 41.252 41.254 41.259 13 107751.435 51.431 51.427 51.423 51.419 51.412 51.408 51.407 51.406 51.409 51.411 51.413 51.415 51.418 51.421 12 14 8851.547 51.542 51.537 51.531 51.527 51.521 51.518 51.517 51.517 51.518 51.519 51.520 51.522 51.525 51.53
20、1 13 16 9951.397 51.394 51.389 51.384 51.381 51.378 51.376 51.376 51.375 51.377 51.379 51.381 51.384 51.386 51.386 9 11 101051.627 51.622 51.619 51.616 51.612 51.610 51.609 51.609 51.609 51.609 51.610 51.611 51.613 51.614 51.615 6 12 111小里程端61.386 61.381 61.377 61.372 61.367 61.364 61.362 61.361 61.
21、360 61.363 61.365 61.369 61.371 61.375 61.378 15 8 12261.361 61.348 61.347 61.345 61.343 61.342 61.339 61.338 61.337 61.340 61.341 61.343 61.345 61.347 61.349 9 12 13361.384 61.382 61.380 61.377 61.375 61.373 61.371 61.370 61.369 61.371 61.372 61.375 61.375 61.377 61.378 7 6 14461.417 61.410 61.407
22、61.403 61.398 61.396 61.394 61.393 61.39261.396 61.398 61.401 61.404 61.406 61.407 11 10 15561.358 61.353 61.349 61.346 61.343 61.339 61.337 61.337 61.337 61.340 61.342 61.345 61.348 61.349 61.350 10 8 16661.373 61.370 61.365 61.362 61.359 61.355 61.352 61.351 61.351 61.354 61.358 61.361 61.363 61.3
23、65 61.366 12 7 17771.347 71.343 71.340 71.336 71.332 71.328 71.327 71.326 71.326 71.329 71.330 71.335 71.337 71.339 71.340 11 7 18871.294 71.291 71.287 71.282 71.279 71.276 71.275 71.275 71.274 71.277 71.279 71.282 71.285 71.286 71.286 9 8 19971.268 71.262 71.258 71.254 71.251 71.249 71.248 71.247 71.247 71.249 71.252 71.255 71.258 71.259 71.259 10 9 201071.288 71.284 71.281 71.277 71.274 71.270 71.268 71.267 71.265 71.268 71.271 71.274 71.275 71.276 71.277 9 11 附件4:挂篮沉降变形曲线表图1 跨赣江特大桥13#墩挂篮预压沉降变形观测分析折线图图1 跨赣江特大桥14#墩挂篮预压沉降变形观测分析折线图
