交通科技
交通科技
교통과기
TRANSPORTATION SCIENCE & TECHNOLOGY
2014年
6期
23-25,26
,共4页
三峡库区%深水基础施工%固定式施工平台%钢吊箱围堰
三峽庫區%深水基礎施工%固定式施工平檯%鋼弔箱圍堰
삼협고구%심수기출시공%고정식시공평태%강조상위언
the three gorges reservoir area%constructing foundation in deepwater%fixed type construc-tion platform%steel suspension box cofferdam
某大桥位于三峡库区，桥址所在河谷呈“U”形。桥型设计为预应力混凝土连续刚构，主墩基础采用高桩承台基础。由于三峡水库从2009年开始正式蓄水，水库常年蓄水位在145～175 m之间变化，变幅达30 m，在水库里进行大型桥梁的基础施工存在水深大、施工期水位变幅大等困难。大桥在水库高水位时（长江枯水期）采用固定式施工平台施工桩基础，在低水位时（长江汛期）下放钢吊箱围堰施工承台及桥墩。该方案安全性高，经济性好，工期短且易于保证。
某大橋位于三峽庫區，橋阯所在河穀呈“U”形。橋型設計為預應力混凝土連續剛構，主墩基礎採用高樁承檯基礎。由于三峽水庫從2009年開始正式蓄水，水庫常年蓄水位在145～175 m之間變化，變幅達30 m，在水庫裏進行大型橋樑的基礎施工存在水深大、施工期水位變幅大等睏難。大橋在水庫高水位時（長江枯水期）採用固定式施工平檯施工樁基礎，在低水位時（長江汛期）下放鋼弔箱圍堰施工承檯及橋墩。該方案安全性高，經濟性好，工期短且易于保證。
모대교위우삼협고구，교지소재하곡정“U”형。교형설계위예응력혼응토련속강구，주돈기출채용고장승태기출。유우삼협수고종2009년개시정식축수，수고상년축수위재145～175 m지간변화，변폭체30 m，재수고리진행대형교량적기출시공존재수심대、시공기수위변폭대등곤난。대교재수고고수위시（장강고수기）채용고정식시공평태시공장기출，재저수위시（장강신기）하방강조상위언시공승태급교돈。해방안안전성고，경제성호，공기단차역우보증。
A bridge is located in the Three Gorges Reservoir,where the valley showsUType.The bridge is designed as prestressed concrete continuous rigid frame.The main pier foundation is high pile foundation.Because the Three Gorges Reservoir started water storage in 2009,and the perennial water level varies from 145 to 175m with a variation of 30m,there are difficulties in foundation con-struction of large bridges in the reservoir with great water depth and large variation range of water level in construction period.The pile foundation is constructed in the high water level of reservoirs (the Yangtze River during dry season)using a fixed type construction platform,and the cap and pier is constructed in the low water level (the Yangtze River flood)using steel suspension box cofferdam.The scheme has high security,good economy,and short construction period and is easy to be guaranteed.
