【摘要】：臺(tái)灣西部河川的中下游主河道均有嚴(yán)重下降的情況,臺(tái)風(fēng)、洪水侵襲期間由于水位和沖刷深度的變化嚴(yán)重影響橋梁安全。橋梁管理單位常以水位高程作為封橋決策的依據(jù),這雖然簡(jiǎn)單,但缺乏強(qiáng)而有力的技術(shù)支撐。因此,在洪流沖擊下仍能穩(wěn)定應(yīng)用沖刷深度監(jiān)測(cè)系統(tǒng)十分重要。在國(guó)內(nèi)外已實(shí)施的沖刷自動(dòng)化觀測(cè)方法中,儀器設(shè)備受河道沖淤形態(tài)、高含沙量、高鹽度、裝置固定困難和在現(xiàn)場(chǎng)布置時(shí)與施工發(fā)生沖突等局限,往往不能實(shí)時(shí)反映涉水橋基的局部沖刷性態(tài)。因此,研究引用蘇通大橋沖刷監(jiān)測(cè)技術(shù),通過沉底式水壓計(jì)對(duì)河床面與水位(水頭)實(shí)時(shí)量測(cè),比對(duì)相對(duì)水頭差異,以求取沖刷面的深度。蘇通大橋?qū)倌嗌百|(zhì)河床,研究橋段屬卵礫石河段,但臺(tái)灣地形狹長(zhǎng),河川坡陡、水流湍急,對(duì)于監(jiān)測(cè)設(shè)備的建置與保存較蘇通大橋更為困難。研究特別考慮適用于現(xiàn)場(chǎng)環(huán)境惡劣的土建工程安全監(jiān)測(cè),采用了堅(jiān)固且密封的鋼箍,使水壓計(jì)能在長(zhǎng)期監(jiān)測(cè)過程中保持極高的可靠性與穩(wěn)定性,并且可在惡劣環(huán)境中正常運(yùn)作的監(jiān)測(cè)儀器十分必要。
[Abstract]:The main rivers in the middle and lower reaches of the western Taiwan rivers have a serious decline. The bridge safety is seriously affected by the changes of water level and scour depth during typhoon and flood. The bridge management unit often takes the water level elevation as the basis for the decision of sealing bridge, which is simple, but lacks strong and powerful technical support. Therefore, it is very important to be able to apply scour depth monitoring system stably under flood impact. Among the automatic scour observation methods implemented at home and abroad, the instruments and equipments are limited by river channel scouring and silting, high sediment content, high salinity, difficulty in fixing the device and conflict with construction during site arrangement. The local scour behavior of wading bridge foundation is often not reflected in real time. Therefore, using the technology of erosion monitoring of Sutong Bridge, the river bed surface and the water level (head) are measured in real time by the bottom water pressure meter, and the difference of relative water head is compared to obtain the depth of the scour surface. Sutong Bridge is a muddy sandy river bed. The study section belongs to the gravel reach, but Taiwan has a long and narrow terrain, steep river slope and rapid water flow, so it is more difficult to build and preserve monitoring equipment than Sutong Bridge. In particular, the study takes into account the safety monitoring of civil engineering which is suitable for the adverse environment on the spot, and adopts firm and sealed steel hoops, which enables the hydraulic pressure gauge to maintain extremely high reliability and stability in the long term monitoring process, And it is very necessary that the monitoring instrument can operate normally in the bad environment.
【作者單位】： 中原大學(xué)土木工程學(xué)系;
【基金】：高科技橋梁實(shí)時(shí)監(jiān)測(cè)系統(tǒng)建置試辦計(jì)劃(No.9808)~~
【分類號(hào)】：TV149

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