支架預(yù)壓沉降觀測分析報告

1、精選優(yōu)質(zhì)文檔-傾情為你奉上吉安贛江特大橋13#、14#墩三角形掛籃預(yù)壓沉降觀測分析總結(jié)報告編制： 審核： 審批：監(jiān)理工程師： 中鐵二十二局集團第四工程有限公司蒙華項目經(jīng)理部2017年10月23日專心-專注-專業(yè)吉安贛江特大橋13#、14#掛籃預(yù)壓沉降觀測分析總結(jié)報告一、 預(yù)壓目的為了確保掛籃施工安全，減少掛籃的非彈性變形,獲取彈性變形參數(shù),得出壓重與掛籃本身的變形關(guān)系,為掛籃施工和線性控制提供掛籃彈性撓度計算的可靠依據(jù),保證施工質(zhì)量和安全，對掛籃進行加載試驗檢驗，消除整個掛籃的塑性變形，測量出掛籃的彈性變形。二、 預(yù)壓方法a、預(yù)壓加載按照加壓荷載的0%、20%、40%、60%、80%、100%

2、、110%進行，布載截面形式應(yīng)模擬梁體荷載分布。加載順序盡可能模擬混凝土澆筑順序。在加載前0%時先進行測量，第一次加載箱梁底板及腹板處，加載至20%，依次40%、60%、80%、100%、，加載至110%，采用1m×1m×0.62m類型混凝土預(yù)制塊231塊。具體加載順序詳見荷載布置斷面圖。b、采用水準(zhǔn)儀測量，分別測量加載前讀數(shù)。加載時，按照加壓荷載的0%、20%、40%、60%、80%、100%、110%分級進行，加載完成后觀測記錄，直至最后的平均沉降值<2mm并滿足24小時以上時方可卸載。然后逐級卸載至100%、80%、60%、40%、20%、0%。待總體沉降量穩(wěn)定

3、后，最后再測量一次卸載后讀數(shù)。c、在壓載過程中采用水準(zhǔn)儀實施全天候跟蹤觀測掛籃的變形情況并作好記錄，待掛籃不再發(fā)生沉降，預(yù)壓過程即告結(jié)束。在進行壓載施工中，要邊進行壓載，邊觀測掛籃的變形情況，發(fā)現(xiàn)異常應(yīng)立即停止壓載作業(yè)，及時查找原因，處理正常后再進行壓載。d、掛籃標(biāo)高調(diào)整：架體預(yù)壓前，掛籃按照設(shè)計標(biāo)高調(diào)整，通過預(yù)壓，觀測計算得出掛籃彈性變形數(shù)值，調(diào)整梁底標(biāo)高。梁底標(biāo)高=設(shè)計梁底標(biāo)高+掛籃彈性變形值+設(shè)計預(yù)拱度。掛籃預(yù)制塊縱面布置圖三、 預(yù)壓過程表1 跨贛江特大橋13#墩掛籃預(yù)壓記錄表序號日 期時 間施工情況備 注12017.10.188:00-8:30加載前22017.10.188:30-9:

4、40加載至2032017.10.1811:45-14:00加載至4042017.10.1816:00-17:20加載至6052017.10.196:30-8:20加載至8062017.10.1910:20-11:25加載至10072017.10.1913:00-13:35加載至11082017.10.2015:35-16:10卸載至10092017.10.2018:10-18:50卸載至80102017.10.216:30-7:35卸載至60112017.10.2110:20-11:25卸載至40122017.10.2113:00-14:35卸載至20132017.10.2116:50-18:

5、10卸載至0表2 跨贛江特大橋14#墩掛籃預(yù)壓記錄表序號日 期時 間施工情況備 注12017.10.1713:00-13:30加載前22017.10.1716:35-17:20加載至2032017.10.187:00-7:35加載至4042017.10.1810:00-10:25加載至6052017.10.1814:00-14:35加載至8062017.10.1818:15-18:40加載至10072017.10.198:35-9:16加載至11082017.10.209:15-9:45卸載至10092017.10.2013:00-13:32卸載至80102017.10.2017:20-17:

6、50卸載至60112017.10.219:40-10:06卸載至40122017.10.2117:31-17:58卸載至20132017.10.228:10-8:35卸載至0四、 預(yù)壓結(jié)果匯總表1 預(yù)壓結(jié)果匯總墩 號平均彈性變形13# 15 mm14# 13 mm五、成果應(yīng)用本次觀測較真實模擬箱梁施工的加載過程,達到了預(yù)壓目的，驗證了該掛籃結(jié)構(gòu)的設(shè)計滿足安全和質(zhì)量要求。本次預(yù)壓所得數(shù)據(jù)能夠指導(dǎo)施工,預(yù)壓結(jié)果合格,滿足規(guī)范及設(shè)計要求.可運用該掛籃進行13#、14#主墩連續(xù)梁現(xiàn)澆施工。根據(jù)設(shè)計圖紙，設(shè)計只提拱了成橋后預(yù)拱度，在掛籃施工過程中。還要考慮掛籃變形的因素。因此，施工預(yù)拱度為掛籃彈性變形值

7、+設(shè)計預(yù)拱度，則：對于已預(yù)壓的掛籃，根據(jù)如下公式調(diào)整底模標(biāo)高：底模頂面標(biāo)高=梁底設(shè)計標(biāo)高+設(shè)計預(yù)拱度（1.5cm）+彈性變形即13#底膜頂面標(biāo)高=62.312+0.015+0.015=62.342 14#底膜頂面標(biāo)高=62.312+0.013+0.015=62.340 后附表：預(yù)壓結(jié)果表格附件1:沉降觀測點橫斷面示意圖附件2:底版預(yù)壓觀測點平面布置圖梁端（小里程）1橋墩 13#中心橋墩 1梁端（大里程）75 57 2288339946 641010圖1 13#墩底板和上橫梁預(yù)壓觀測點平面布置圖梁端（小里程）1橋墩 14#中心橋墩 1梁端（大里程）75 57 2288339946 641010圖

8、2 14#墩底板和上橫梁預(yù)壓觀測點平面布置圖附件3:掛籃沉降監(jiān)測表表1 跨贛江特大橋13#墩掛籃預(yù)壓沉降觀測數(shù)據(jù)記錄表序號編號布點位置加荷載前荷載20荷載40荷載60荷載80荷載100荷載110卸載100%卸載80%卸載60%卸載40%卸載20%卸載后彈性形變（mm）塑性形變（mm）0小時12小時24小時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 61.65

9、30 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 61.6119 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 6

10、1.5709 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 61.9645 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 61.965

11、9 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 72.6158 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

12、.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 72.5818 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

13、 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 61.9087 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 6

14、1.8963 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 61.9009 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

15、.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 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 72.61

16、04 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 72.5973 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 72.596

17、6 72.6006 72.6042 72.6078 19 17 表2 跨贛江特大橋14#墩掛籃預(yù)壓沉降觀測數(shù)據(jù)記錄序號編號布點位置加荷載前荷載20荷載40荷載60荷載80荷載100 荷載110卸載100%卸載80%卸載60%卸載40%卸載20%卸載后彈性形變（mm）塑性形變（mm）0小時12小時24小時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.

18、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 41.278 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

19、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 41.254 41.252 41.246 41.246 41.245 41.246 41.246 41.242 41.252 41.254 41.259 13 10 7751.435 51.431 51.427 51.423 51.419 51.412 51.408 51.407 51.406 51.409

20、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 51.531 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

21、.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 61.360 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 61.403 61.398 61.396 61.394 61.393 61.392 61.396 61.398 61.401 61.404 61.406 61.407 11 10 15561.358 61.353 61