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1、本科毕业论文题目:龙头寨北江大桥施工图设计学院:城市建设学院专业:土木工程学号:200708141144学生姓名:指导教师:日期:二○一一年六月摘要本设计是根据设计任务书的要求和《公路桥规》的规定,对龙头寨北江大桥进行设计。对该桥的设计,本着使桥梁与环境协调一致和经济的原则,本论文提出三种不同的桥型方案进行比选:方案一为预应力混凝土简支小箱梁梁桥,方案二为钢管混凝土下承式拱桥。方案三为双塔斜拉桥。通过比较它们在经济、美观、作用下的特性和实用性几方面,最终比较确定预应力混凝土简支小箱梁梁桥为推荐方案。本设计采用预应力混凝土简支梁桥,跨径
2、布置为5×40m,主梁采用小箱梁,梁高为2m,桥墩(台)采用双柱墩(台)。首先进行桥型方案比选,对主桥进行总体结构设计,然后对上部结构进行内力、配筋计算,再进行强度、应力及变形验算,最后再确定下部结构采用以钻孔灌注桩为基础的双墩柱,采用盆式橡胶支座,并分别对桥墩和桩基础进行了计算和验算。经过对桥梁上下部结构计算,确定了施工图的最终方案,并依据计算书采用计算机绘制龙头寨北江大桥施工图。最后经过复核计算书以后,确定所有设计工作均符合设计任务书的要求。关键词:预应力混凝土简支梁桥;小箱梁;双柱桥墩(台);钻孔灌注桩;1AbstractThi
3、sisaconstructiondocumentsdesignofamajorbridgethatisoverthemiddleofBeijianginLongtouzhai,accordingtodesigningassignmentandthestandardofroadandbridge.Forthepurposeofmakethebridgecorrespondingwiththeambienceandcostsaving,thispaperprovidesthreedifferenttypesofbridgeforselec
4、tion:thefirstoneispre-stressedconcretebeamsmallboxgirderbridge;thesecondoneisCFSTthroughbridge.,andthethirdoneisdoublepyloncablestayedbridge.Afterthecomparisonsofeconomy,appearance,characteristicunderthestrengthandeffect,thefirstoneisselected.Thebridgebelongstotheprestr
5、essedconcretedstructuerwhichisasimplesupportedbeambridge.Thespanarrangmentsis5×40m.Thesuperstructureissmallboxgirder,theheightofthegrideris2m,andthepier(abutment)istwo-columnpier(abutment).Thisessayfocusesonthedesignandcalculationprocessofthebridge.Firstly,compareandcho
6、oseabestschemefrom3kindsofbridgetypes,andmakeanoverrallstructuredesignofthemainspan.secondly,performandcalculationoftheinternalforceandreinforcingbaronthesuperstructure.thirdlychecktheintensity,stressandthedeflection.finally,determinethetwo-columnpierofthebridgeisbasing
7、onboredpile,andadoptpotrubberbearing.WhatismorethepiersandthePilefoundationsarecalculatedandcheckedrespectively.Aferthecalculationofthesuperstructureandsusstructureofbridge,theconstructiondocumentsisfinalised,andconstructiondrawingisprotractedbytheAutoCAD,accordingtheca
8、lculations.Finally,allofthedesignworkmeetstherequirementsofdesigningassignmentafterreviewingthecalculations.Ke