CAJ | 학술논문

宁安铁路安庆长江大桥主桥为101.5＋188.5＋580＋217.5＋159.5＋116（m）三索面钢桁梁斜拉桥。桥梁主塔墩3号墩位于主河槽通航航道上,施工水位深,河床覆盖层浅,覆盖层下面为强风化光板岩,岩面高低不平;承台为圆形,直径大,桩基础为3.0 m/3.4 m变直径摩擦型钻孔桩。3号墩基础施工采用双壁钢套箱围堰方案,先围堰,后钻孔。钢套箱外径56 m,高42.88 m,属大型钢围堰。从围堰组拼、下水、浮运、定位、下沉等方面,详细介绍了宁安城际铁路安庆长江大桥3号墩钢套箱围堰的施工技术,为以后同类工程的施工提供借鉴。
저안철로안경장강대교주교위101.5＋188.5＋580＋217.5＋159.5＋116（m）삼색면강항량사랍교。교량주탑돈3호돈위우주하조통항항도상,시공수위심,하상복개층천,복개층하면위강풍화광판암,암면고저불평;승태위원형,직경대,장기출위3.0 m/3.4 m변직경마찰형찬공장。3호돈기출시공채용쌍벽강투상위언방안,선위언,후찬공。강투상외경56 m,고42.88 m,속대형강위언。종위언조병、하수、부운、정위、하침등방면,상세개소료저안성제철로안경장강대교3호돈강투상위언적시공기술,위이후동류공정적시공제공차감。
The main bridge of Anqing Changjiang River Bridge in Ning-An Railway is three rope fan and steel truss slant pull bridge,which is composed of 101.5＋188.5＋580＋217.5＋159.5＋116（m）.The No.3 pier,the main pier,lies in the main riverbed Navigable channel characterized by deep water,shallow riverbed＇s cover,strong weathering sleek under the riverbed＇s cover an uneven rock;while the cushion cap is circle with big diameter and variable diameter sliding drilled pile with pile foundation at 3.0 m/3.4 m.Double-wall steel case cofferdam is used in the No.3 pier foundation construction with cofferdam constructed first followed by drilling.The steel case cofferdam has an outside diameter of 56 m and height of 42.88 m which make it a huge cofferdam.The paper introduces the construction technique for the No.3 pier steel case cofferdam of Anqing Changjiang River Bridge through assembling,launching,transportation by driving,location,and sinking,and it can provide the reference for the same bridge construction in the future.