福建大剧院超长结构无缝设计与施说工论文.doc
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11、aining福建大剧院超长结构无缝设计与施工福建省第一建筑工程公司 陈彩虹摘要:通过福建大剧院超长结构无缝设计的实例,介绍了膨胀加强带的设计方法、施工步骤和注意事项。关键词:超长结构、无缝设计、膨胀加强带The Seamless Design And ConstructionOf Ultra Long Structure In Fujian TheaterAbstract: Through the example of seamless design of ultra long structure in the Fujian theater, the text introduces the d
12、esign method, the construction step and the regulation of the inflation strengthen belt.Keywords: ultra long structure,seamless design,the inflation strengthen belt1 工程概况1.1建筑概况本工程位于福州市五一广场南侧,南临规划中的海底路,西临广达路,总建筑面积为29712m2,建筑分A、B、C三个分区。其中A区为大剧院建筑面积为22865 m2,地下一层,面积3200 m2,地上四层,局部五层,面积19665 m2;B区为会议厅,
13、多功能厅等,建筑面积为4202 m2,地下一层面积1100 m2,地上三层面积3102 m2;C区为多功能剧场及附属设施,地上三层,建筑面积2645 m2。1.2结构概况本工程为框架剪力墙结构体系,A区长117.5m,宽74m,高22.6m,局部高38m。B区、C区均为长59m,宽23m,高14m。结构安全等级A区、C区为一级,B区为二级,防水等级一级。砼强度:地下室底板C30、S8,外墙C40、S8。框架柱、剪力墙C40,梁板C35。底板厚900mm、800mm、400mm。1.3后浇带设计概况A区自地下室底板至上部结构标高12.95m,设计了二横一纵的后浇带,结构平面划分为6块。B区、C区
14、均设计一条横向后浇带。后浇带砼浇注时间为两侧砼浇注后两个月。2 膨胀加强带取代后浇带的原由1、本工程结构复杂,施工难度大,后浇缝的保护、清理与凿毛非常困难。2、设计防水等级为一级,采用后浇带施工缝增多,留下渗漏水隐患。3、施工工期紧,结构为220天,而设计要求后浇带的填缝需待结构两侧砼浇筑后2个月方可施工,影响总工期。4、膨胀加强带技术已广泛运用,在包括北京西客站、福建长乐国际机场航站楼等100多个超长结构中应用成功。3 超长无缝结构技术3.1超长结构无缝设计裂缝控制的基本原理根据抗裂原理,只要控制混凝土的收缩与膨胀保持一个相对的范围内,结构是不会开裂的。常规的方法就是使用高性能膨胀剂。在混凝
15、土中掺加适量的混凝土膨胀剂,通过水泥的化学反应,使混凝土产生适量膨胀,在钢筋和邻位限制下,在钢筋混凝土中建立0.30.8Mpa的预压应力,可大致抵消砼收缩产生的拉压力,防止混凝土开裂。同时,水化反应生成的钙钒石晶体属针状、棒状晶体,填充、切断、堵塞混凝土的毛细孔,使混凝土的抗渗能力大大提高。对于超长结构工程的无缝施工问题,目前已形成了较系统的经验和理论。膨胀剂在常规掺量下,一般可60m不设缝,当超过60m时,可采用“加强带”解决,带宽2m,“加强带”内大掺量,带两侧普通掺量。3.2掺建研牌HEA膨胀剂技术性能HEA膨胀剂是减免后浇带的设计技术,一定范围内可实现无缝施工。其技术原理是在收缩应力较
16、大的区段给予较大膨胀应力,全面补偿混凝土超长结构产生的收缩应力,以膨胀加强带替代后浇带,通过HEA掺量设计混凝土的膨胀量。膨胀加强带间距为40m60m左右,带宽2m,膨胀加强带两侧铺设密孔铁丝网和8150钢筋加固,目的是防止砼流入加强带,膨胀加强带外用普通掺量的补偿收缩混凝土浇筑,混凝土膨胀率约(22.5)10-4,加强带内用大膨胀率混凝土浇筑,混凝土膨胀率约为(2.53.5)10-4,其强度等级比两侧提高5MPa。如此循环下去可连续浇筑100150m超长结构,而不设后浇带,参图1。由于混凝土供应或施工组织原因导致混凝土不能连续浇筑时,可用“间歇式无缝施工法”,详图2,即浇筑至加强带一侧作为施
17、工缝,在下次浇筑混凝土前,把施工缝清理干净,凿去部分保护层,充分润湿混凝土界面,然后浇加强带,随后用普通掺量小膨胀砼浇注带外大面积混凝图2 “间歇式”底板无缝设计示意图(立面)图1 有防水要求的HEA无缝设计示意图(立面)土,如此循环下去。3.3由于墙体薄,面积大,养护困难,受到风速和大气温度影响大,容易出现收缩裂缝。因此,我们采用后浇加强带(2m宽),即分段浇注掺810HEA混凝土,养护14d后,用掺1213HEA混凝土回填。要设止水带。(见图3)图3 墙体的后浇加强带设计示意图(立面)3.4为确保福建大剧院地下室底板及墙板砼施工质量满足设计要求,我院提出在福建大剧院地下室底板及外墙砼中采用
18、HEA膨胀剂和TW-10高性能泵送剂双掺技术方案,同时结合超长结构无缝设计裂缝控制原理,底板大约为40m60m设一条膨胀加强带,带宽2m,带两侧用孔径小于5mm钢丝网,带中用大掺量12%13%HEA膨胀剂,砼强度等级提高5MPa,带外用常规掺量8%10%HEA膨胀剂。4 本工程膨胀加强带和后浇膨胀加强带的设计4.1膨胀加强带和后浇膨胀加强带的位置设计依据超长无缝结构技术膨胀加强带和后浇膨胀加强带的间距控制在40m60m,总长控制在100m150m,原结构设计图后浇带设计的间距和位置均可满足“无缝设计”膨胀加强带的要求,平面布置参图4。supervision in large and mediu
19、m goods vehicle. A is established large vehicles and small vehicles classification management of motor vehicle test mode, increased medium van car, and dangerous goods transport car, and school car test project; II is established motor vehicle test regulatory platform, achieved motor vehicle test fu
20、ll process video, and data remote regulatory; three is strictly motor vehicle identification management, equipped with unified of identification equipment and tool, using mobile identification Terminal, and law enforcement records instrument, technology identification means. As to 20XX years June 20
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