嘉绍大桥刚性铰专用支座设计

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1、嘉绍大桥刚性铰专用支座设计吕为昱，林道锦，熊劲松，黄滔，王仁贵53文章编号：1003—4722(2011)05—0053—06嘉绍大桥刚性铰专用支座设计吕为昱，林道锦，熊劲松。，黄滔。，王仁贵(1．嘉绍跨江大桥工程建设指挥部，浙江绍兴312366；2．中交公路规划设计院有限公司，北京100088；3．成都市新筑路桥机械股份有限公司，四川成都611430)摘要：嘉绍大桥为六塔独柱四索面钢箱梁斜拉桥，其主梁中跨跨中区域设置刚性铰。针对刚性铰结构的特殊要求，设计出一种具有柔性减振并可调节高度的球型钢支座。

2、该支座由楔形板、轴承座、摩擦副、球冠衬板、橡胶减振垫、剪力卡榫、滑动板等组成。通过在刚性铰中的磨耗试验对比，支座摩擦副滑板材料选择了对温度的敏感程度和在相同压应力下摩擦系数均低于改性超高分子量聚乙烯的聚四氟乙烯。采用在下支座板上硫化一层橡胶减振垫的柔性减振措施减小支座承受的应力峰值，避免冲击破坏。通过对3种支座高度调节方案对比，选择了更适于刚性铰结构、操作简单、可无级调高且可以实现调低功能的楔形板调高方案。关键词：桥梁支座；球型支座；刚性铰；耐磨性；减振中图分类号：U443．362文献标志码：ADe

3、signofPurpose—MadeBearingforRigidHingeofJiashaoBridgeLUWf—H，LJNOao-jin。，XJ0NGJing—song。，H【NGTao。，NGRen—gui(1．ConstructionHeadquartersofJiashaoRiver-Cr0ssingBridgeProject，Shaoxing312366，China；2．CCCCHighwayConsultantsCo．，Ltd．，Beijing100088，China；3．Chengd

4、uXinzhuRoadandBridgeMachineryCo．，Itd．，Chengdu611430，China)Abstract：TheJiashaoBridgeisasteelboxgirdercable—stayedbridgewithsixsingle—columnpylonsandfourcableplanes．Inthecentralspanmidspanareasofthemaingirderofthebridge，therigidhingeswerearranged．Inviewo

5、fthespecialrequirementsfortherigidhingestructure，akindofsphericalsteelbearingthathasflexibledampingandheightadjustingcapacitywasde—signed．Thebearingismadeupofwedgeplate，bearingseat，wearingpair，sphericalbackingplate，dampingrubberpad，shearclamperandslidi

6、ngplate．Bycomparisonofthewearingtestsforthehingestructure。thePTFEthatislesssensitivetothetemperaturesandthathasfrictionalcoefficientslessthanthoseofthemodifiedultra—highmolecularweightpolyethyleneunderthesamecompressivestressconditionswasselectedforthe

7、slidingplateofthewearingpair．Thedampingmeasureofsulphidingalayerofrubberpadonthelowerbearingplatewastakentore—ducepeakvaluesofthestresssustainedbythebearingandtoavoidimpactingdamage．Alsobycomparisonofthreekindsoftheschemesofbearingheightadjusting，thesc

8、hemeofthewedgeplateheightadjustingthatismoresuitableforthehingestructure，thatissimplyoperationalandcansteplesslyadjusttheheightupwardanddownwardwasselected．Keywords：bridgebearing；sphericalbearing；rigidhinge；wearingresistance；damping收稿日期