世界桥梁
世界橋樑
세계교량
WORLD BRIDGE
2014年
4期
15-19
,共5页
悬索桥%散索鞍支墩%混凝土结构%承载膺架%液压设备%主动起顶%应力%有限元法%施工技术
懸索橋%散索鞍支墩%混凝土結構%承載膺架%液壓設備%主動起頂%應力%有限元法%施工技術
현색교%산색안지돈%혼응토결구%승재응가%액압설비%주동기정%응력%유한원법%시공기술
suspension bridge%splay saddle support pier%concrete structure%load bearing frame%hydraulic equipment%active jack-up%stress%finite element method%construction technique
重庆绕城公路鱼嘴长江大桥主桥为（180＋616＋205） m单跨双立铰简支悬索桥，北锚散索鞍支墩为超高大坡度混凝土结构，倾斜67°。受大倾角的影响，在支墩混凝土浇筑过程中支墩会产生变形，墩底外边缘会产生拉应力。鉴于此，采取主动克服散索鞍支墩混凝土自重的方法，对支墩承载膺架结构和液压设备布置进行设计，设计确定将承载膺架安装在锚体内箱室中，按2个受力面、2个支承面形成箱式结构设计，采用万能杆件拼装，并在3道横梁处各布置8台液压设备，分阶段主动起顶。结构计算结果表明，该控制技术可以有效控制散索鞍支墩各悬臂浇筑节段墩底产生的拉应力，应力满足规范要求。工程应用证明，在散索鞍分节段浇筑过程中，采用该控制技术有效地控制了墩体结构的应力，墩体结构施工满足规范要求。
重慶繞城公路魚嘴長江大橋主橋為（180＋616＋205） m單跨雙立鉸簡支懸索橋，北錨散索鞍支墩為超高大坡度混凝土結構，傾斜67°。受大傾角的影響，在支墩混凝土澆築過程中支墩會產生變形，墩底外邊緣會產生拉應力。鑒于此，採取主動剋服散索鞍支墩混凝土自重的方法，對支墩承載膺架結構和液壓設備佈置進行設計，設計確定將承載膺架安裝在錨體內箱室中，按2箇受力麵、2箇支承麵形成箱式結構設計，採用萬能桿件拼裝，併在3道橫樑處各佈置8檯液壓設備，分階段主動起頂。結構計算結果錶明，該控製技術可以有效控製散索鞍支墩各懸臂澆築節段墩底產生的拉應力，應力滿足規範要求。工程應用證明，在散索鞍分節段澆築過程中，採用該控製技術有效地控製瞭墩體結構的應力，墩體結構施工滿足規範要求。
중경요성공로어취장강대교주교위（180＋616＋205） m단과쌍립교간지현색교，북묘산색안지돈위초고대파도혼응토결구，경사67°。수대경각적영향，재지돈혼응토요축과정중지돈회산생변형，돈저외변연회산생랍응력。감우차，채취주동극복산색안지돈혼응토자중적방법，대지돈승재응가결구화액압설비포치진행설계，설계학정장승재응가안장재묘체내상실중，안2개수력면、2개지승면형성상식결구설계，채용만능간건병장，병재3도횡량처각포치8태액압설비，분계단주동기정。결구계산결과표명，해공제기술가이유효공제산색안지돈각현비요축절단돈저산생적랍응력，응력만족규범요구。공정응용증명，재산색안분절단요축과정중，채용해공제기술유효지공제료돈체결구적응력，돈체결구시공만족규범요구。
T he main bridge of Yuzui Changjiang River Bridge on Chongqing Ring Road is a (180+616+205) m single span simply-supported suspension bridge with double vertical hinges . The support pier of the splay saddle in the north anchor block is designed as high-rise concrete structure with large gradient .The support pier inclines at an angle of 67° ,which might possibly succumb to deformation during the concrete casting process under the effect of the large inclining angle ,consequently tensile stress will occur on the external edge of the pier base .Due to these reasons ,the frame of the support pier w hich bears load and the arrangement of the hydraulic e-quipment were designed by the way of allowing them to actively counteract the self-weight of the concrete of the splay saddle support pier .The load bearing frame was planned to install in the in-ternal box of the anchor block to form a box structure with two load bearing sides and two support-ing sides .The frame was made of standard members ,on the three cross beams of which eight sets of hydraulic equipment were installed .The frame was positively jacked up phase by phase .The re-sults of structural calculation demonstrate that the control technique is able to effectively control the tensile stress generating in the pier base during each phase of the cantilever casting of the sup-port pier of the splay saddle and the stress meets the requirements .Engineering experience proves that by using the control technique ,the stress in the support pier is effectively under control and the support pier construction meets the code requirements .
