幸运飞艇长

土木工程網-工程師的家園
大體積混凝土裂縫的控制與處理
RSS 打印 復制鏈接 發布時間:2013-12-16 08:34:42

 【摘要】隨著國家建設的發展,市政工程的投入進一步加大,大體積混凝土在橋梁結構中應用的越來越多,而且主要應用于主要受力部分,但是,相應暴露出來的問題也越來越多,其中,大體積混凝土的裂縫問題尤為突出。本文通過現場施工管理,從設計、施工的角度,分析了造成橋梁結構中大體積混凝土裂縫的原因,并提出如何預防,檢查和處理大體積混凝土裂縫的主要技術措施。
幸运飞艇长 【關鍵詞】大體積混凝土;裂縫;原因;控制;處理防范


1、         混凝土裂縫產生的原因

1.1KANGLAQIANGDU

DATIJIHUNNINGTUJIEGOUTONGCHANGJUYOUYIXIATEDIAN:HUNNINGTUSHICUIXINGCAILIAO,KANGLAQIANGDUZHIYOUKANGYAQIANGDUDE1/10ZUOYOU。DATIJIHUNNINGTUDEDUANMIANCHICUNJIAODA,YOUYUSHUINIDESHUIHUAREHUISHIHUNNINGTUNEIBUWENDUJIJUSHANGSHENG;YIJIZAIYIHOUDEJIANGWENGUOCHENGZHONG,ZAIYIDINGDEYUESHUTIAOJIANXIAHUICHANSHENGXIANGDANGDADELAYINGLI。DATIJIHUNNINGTUJIEGOUZHONGTONGCHANGZHIZAIBIAOMIANPEIZHISHAOLIANGGANGJIN,HUOZHEBUPEIGANGJIN,YINCILAYINGLIYAOYOUHUNNINGTUBENSHENLAICHENGDAN。

幸运飞艇长1.2WENDUBIANHUAYINQIDELIEFENG

WENDUBIANHUAYINQIDELIEFENGDUOFASHENGZAIDATIJIHUNNINGTUBIAOMIANHUOWENCHABIANHUAJIAODADIQUDEHUNNINGTUJIEGOUZHONG。HUNNINGTUJIAOZHUHOU,ZAIYINGHUAGUOCHENGZHONG,SHUINISHUIHUACHANSHENGDALIANGDESHUIHUARE,(DANGSHUINIYONGLIANGZAI350~550kg/m3,MEILIFANGMIHUNNINGTUJIANGSHIFANGCHU17500~27500KJDERELIANG,CONGERSHIHUNNINGTUNEIBUDEWENDUSHENGDA70℃ZUOYOUSHENZHIGENGGAO)。HUNNINGTUJUYOUREZHANGLENGSUODEXINGZHI,DANGWAIBUHUANJINGHUOJIEGOUNEIBUWENDUFASHENGBIANHUA,HUNNINGTUJIANGFASHENGBIANXING,RUOBIANXINGZAODAOYUESHU,ZEZAIJIEGOUNEIJIANGCHANSHENGYINGLI,DANGYINGLICHAOGUOHUNNINGTUKANGLAQIANGDUSHIJICHANSHENGWENDULIEFENG。WENDULIEFENGDETEZHENGZHUYAOSHIBIAOMIANLIEFENGDEZOUXIANGYIBANYUZHUJINPINGXINGHUOJIEJINPINGXING;LIEFENGKUANDUDAXIAOBUYI。

1.3SUXINGLIEFENG

SUXINGLIEFENGDUOZAIXINJIAOZHUDEHUNNINGTUGOUJIANBAOLUYUKONGQIZHONGDESHANGBIAOMIANCHUXIAN,SUXINGSHOUSUOSHIZHIHUNNINGTUZAININGJIEZHIQIAN,BIAOMIANYINSHISHUIJIAOKUAIERCHANSHENGDESHOUSUO。SUXINGSHOUSUOLIEFENGYIBANZAIGANREHUODAFENGTIANQICHUXIAN,LIEFENGDUOCHENGZHONGJIANKUAN、LIANGDUANXIQIECHANGDUANBUYI,HUBULIANGUANZHUANGTAI,JIAODUANDELIEFENGYIBANCHANG20~30㎝,JIAOCHANGDELIEFENGKEDA2~3m,KUAN1~5㎜,HUNNINGTUZAIZHONGNINGQIANJIHUMEIYOUQIANGDUHUOQIANGDUHENXIAO,HUOZHEHUNNINGTUGANGGANGZHONGNINGERQIANGDUHENXIAOSHI,SHOUGAOWENHUOJIAODAFENGLIDEYINGXIANG,HUNNINGTUBIAOMIANSHISHUIGUOKUAI,ZAOCHENGMAOXIGUANZHONGCHANSHENGJIAODADEFUYAERSHIHUNNINGTUTIJIJIJUSHOUSUO,ERCISHIHUNNINGTUDEQIANGDUYOUWUFADIKANGQIBENSHENSHOUSUO,YINCICHANSHENGGUILIE。YINGXIANGHUNNINGTUSUXINGSHOUSUOKAILIEDEZHUYAOYINSUYOUSHUIHUIBI、HUNNINGTUDENINGJIESHIJIAN,HUANJINGWENDU、FENGSU、XIANGDUISHIDUDENGDENG。

1.4HEZAIYINQIDELIEFENG

幸运飞艇长HUNNINGTUQIAOLIANGZAICHANGGUIJING、DONGHEZAIJICIYINGLIXIACHANSHENGDELIEFENGCHENGHEZAILIEFENG,GUINAQILAIZHUYAOYOUZHIJIEYINGLILIEFENG,ZHIJIEYINGLILIEFENGSHIZHIWAIHEZAIYINQIDEZHIJIEYINGLICHANSHENGDELIEFENG,SHEJIJISUANJIEDUAN,JIEGOUJISUANSHIBUJISUANHUOBUFENLOUSUAN;JISUANMOXINGBUHELI;JIEGOUSHOULIJIASHEYUSHIJISHOULIBUFU;HEZAISHAOSUANHUOLOUSUAN;NEILIYUPEIJINJISUANCUOWU;JIEGOUANQUANXISHUBUGOU。JIEGOUSHEJISHIBUKAOLVSHIGONGDEKENENGXING;SHEJIDUANMIANBUZU;JIEGOUCHULIBUDANG;SHEJITUZHIJIAODAIBUQINGDENG。SHIGONGSHI,BUJIAXIANZHIDIDUIFANGSHIGONGJIJU、CAILIAO;BULEJIEYUZHIJIEGOUJIEGOUSHOULITEDIAN,SUIYIFANSHEN、QIDIAO、YUNSHU、ANZHUANG;BUANSHEJITUZHISHIGONG,SHANZIGENGGAIJIEGOUSHIGONGSHUNXU,GAIBIANJIEGOUSHOULIMOSHI;BUDUIJIEGOUZUOJIQIZHENDONGXIADEPILAOQIANGDUYANSUANDENG。

2、        DATIJIHUNNINGTULIEFENGDEKONGZHICUOSHI

2.1CHANJIAWAIJIALIAOHEWAIJIAJI

ZAIDATIJIHUNNINGTUZHONGCHANRUYIDINGLIANGDEFENMEIHUIHOU,KEYIZENGJIAHUNNINGTUDEMISHIDU,SHUINIYOUYUWENCHAZHUYAOSHIYOUSHUIHUARECHANSHENGDE,SUOYIWEILEJIANXIAOWENCHAJIUYAOJINLIANGJIANGDISHUIHUARE,WEILEJIANGDISHUIHUARE,YAOJINLIANGCAIQUZAOQISHUIHUAREDIDESHUINI,YOUYUSHUINIDESHUIHUARESHIKUANGWUCHENGFENYUXIDUDEHANSHU,YAOJIANGDISHUINIDESHUIHUARE,ZHUYAOSHIXUANZESHIYIDEKUANGWUZUCHENGHEDIAOZHENGSHUINIDEXIDUMOSHU,GUISUANYANSHUINIDEKUANGWUZUCHENGZHUYAOYOU:C3S、C2S、C3AHEC4AF,SHIYANBIAOMING:SHUINIZHONGDELVSUANSANGAIHEGUISUANSANGAIHANLIANGGAODE,SHUIHUAREJIAOGAO,SUOYI,WEILEJIANSHAOSHUINIDESHUIHUARE,BIXUJIANGDISHULIAOZHONGC3AHEC3SDEHANLIANG。ZAISHIGONGZHONGYIBANCAIYONGZHONGREGUISUANYANSHUINIHEDIREKUANGZHASHUINI。LINGWAI,ZAIBUYINGXIANGSHUINIHUOXINGDEQINGKUANGXIA,YAOJINLIANGSHISHUINIDEXIDUSHIDANGJIANXIAO,YINWEISHUINIDEXIDUHUIYINGXIANGSHUIHUAREDEFANGRESULV,SHIYANBIAOMINGBIBIAOMIANJIMEIZENGJIA100㎝2/g,1dDESHUIHUAREZENGJIA17J/g~21J/g, 7dHE20dJUNZENGJIA4J/g~12J/g。

2.2TIGAOKANGSHENNENGLI

TIGAOKANGSHENNENGLI,GAISHANHUNNINGTUDEGONGZUODU,JIANGDIZUIZHONGSHOUSUOZHI,JIANSHAOSHUINIYONGLIANG。YAOJIANGDIDATIJIHUNNINGTUDESHUINISHUIHUAREYINQIDENEIBUWENSHENG,FANGZHIJIEGOUCHUXIANWENDULIEFENG,LIYONGFENMEIHUIZUOHUNNINGTUDECHANHELIAOSHIZUIYOUXIAODEFANGFAZHIYI。WAIJIAJIKEYICONGYIXIAJIGEFANGMIANLAIXUANZE。UFAPENGZHANGJI,TAKEYIDENGLIANGTIHUANSHUINI。BINGQIESHIHUNNINGTUCHANSHENGSHIDUDEPENGZHANG。YIFANGMIANBAOZHENGHUNNINGTUDEMISHIDU,LINGYIFANGMIANSHIHUNNINGTUNEIBUCHANSHENGYALI,YIDIXIAOHUNNINGTUZHONGCHANSHENGDEBUFENLAYINGLI。

2.3ZUOHAOBIAOMIANGEREBAOHU

DATIJIHUNNINGTUDEWENDULIEFENG,ZHUYAOSHIYOUNEIWAIWENCHAGUODAYINQIDE。HUNNINGTUJIAOZHUHOU,SHUINIYINSHUIHUAYINQISHUIHUARE,YOUYUHUNNINGTUTIJIDA,JUJIZAINEIBUDESHUINISHUIHUAREBUYISANFA,HUNNINGTUNEIBUWENDUJIANGXIANZHUSHENGGAO,ERQIBIAOMIANZESANREJIAOKUAI,XINGCHENGLEJIAODADEWENDUCHA,SHIHUNNINGTUNEIBUCHANSHENGYAYINGLI,BIAOMIANCHANSHENGLAYINGLI。CISHI,HUNNINGTULINGQIDUAN,KANGLAQIANGDUDI。DANGWENCHACHANSHENGDEBIAOMIANKANGLAYINGLICHAOGUOHUNNINGTUJIXIANKANGLAQIANGDU,ZEHUIZAIHUNNINGTUBIAOMIANCHANSHENGLIEFENG。RUGUOCISHISHOUDAOLENGKONGQIDEXIJI,HUOZHEGUOFENTONGFENGSANRE,SHIBIAOMIANWENDUJIANGWENGUODAJIUHENRONGYIDAOZHILIEFENGDECHANSHENG,SUOYIZAIHUNNINGTUCHAIMOHOU,TEBIESHIDIWENJIJIE,ZAICHAIMOHOULIJICAIQUBIAOMIANBAOHU。FANGZHIBIAOMIANJIANGWENGUODA,YINQILIEFENG。LINGWAI,DANGRIPINGJUNQIWENZAI2~3dNEILIANXUXIAJIANGBUXIAOYU6~8℃SHI,28dLINGQINEIHUNNINGTUBIAOMIANBIXUJINXINGBIAOMIANBAOHU。

3、         DATIJIHUNNINGTULIEFENGDECHULIFANGFAN

3.1DATIJIHUNNINGTUSHIGONGDUANDEHUAFENJIJIAOZHUSHUNXUYINGGENJUJUTIGONGCHENGJIEGOUQUEDING,TONGCHANGANGAIGONGCHENGXIANGMUHUAFENBIAODEDANYUANGONGCHENGJINXINGHUAFEN。HUNNINGTUKECAIYONGHUNNINGTUYUNSHUCHEYUNDAOXIANCHANG,QICHEBENGHUOHUNNINGTUSHUSONGBENGYUNSONGRUCANG;RUCAIYONGFEIBENGSONGHUNNINGTU,KEYONGDIAOCHEZHIJIEBULIAOHUODASHEJIAOSHOUJIACAIYONGJIDONGCHEBULIAO。DATIJIHUNNINGTUBIXUGENJUDANGDIZHONGCHANGQITIANQIYUBAO,XUANZEZUIJIATIANQITIAOJIANJINXINGJIAOZHU,YINGJINLIANGANPAIZAIDIWENSHIDUANJIAOZHU,YIZUIDAXIANDUJIANGDIHUNNINGTUDECHUNINGWENDU。ZAIJIAOZHUGUOCHENGZHONG,YINGZUNXUN“TONGSHIJIAOZHU,FENCENGTUIJIN,YICIDAODING,XUNXUJIANJIN”DECHENGSHUGONGYI。ZHENDAOSHIZHONGDIANKONGZHILIANGDIAN,JIHUNNINGTULIUTANGDEZUIJINDIANHEZUIYUANDIAN,ZHENDONGDIANZHENDONGSHIBUNENGLOUZHEN,JINKENENGCAIYONGLIANGCIZHENDAOGONGYI,YITIGAOHUNNINGTUDEMISHIDU。

幸运飞艇长3.2JIAQIANGHOUQIYANGHUGONGZUO,YANGHUZHUYAOSHIBAOCHISHIYIDEWENDUHESHIDU,YIBIANKONGZHIHUNNINGTUNEIBIAOWENCHA,CUJINHUNNINGTUQIANGDUDEZHENGCHANGFAZHANJIFANGZHIHUNNINGTULIEFENGDECHANSHENGHEFAZHAN。GENJUGONGCHENGDEJUTIQINGKUANG,YINGJINKENENGDUOYANGHUYIDUANSHIJIAN,CHAIMOHOULIJIHUITUHUOFUGAIBAOHU,TONGSHIYUFANGJINQIZOULENGQIHOUYINGXIANG,YIKONGZHINEIBIAOWENCHA,FANGZHIHUNNINGTUZAOQIHEZHONGQILIEFENG。YANGHUYONGSHUIDEWENDUYINGYUXIANCHANGCEDEDEHUNNINGTUBIAOMIANWENDUJIEJIN,YIMIANRENWEIZAOCHENGHUNNINGTUBIAOMIANCHANSHENGWENDUTIDU,JINERCHUXIANLIEFENG。DATIJIHUNNINGTUDEYANGHU,BUJINYAOMANZUQIANGDUZENGCHANGDEXUYAO,HUANYINGTONGGUOWENDUKONGZHI,FANGZHIYINWENDUBIANXINGYINQIHUNNINGTUDEKAILIE。WENDUKONGZHIJIUSHIDUIHUNNINGTUDEJIAOZHUWENDUHEHUNNINGTUNEIBUDEZUIGAOWENDUJINXINGKONGZHI。

4、  JIESHUYU

通過對裂縫產生的原因、機理的分析,采取一定的針對性的措施,大體積混凝土的裂縫是可以減少到合理范圍的。但由于裂縫產生的原因很復雜,要做到完全避免裂縫的產生還有一定的難度,還需要大量的研究和實踐。控制和預防大體積混凝土裂縫,大體積混凝土的材料型裂縫主要是由溫度應力和混凝土收縮引起的,筆者認為精心選擇原材料,并在施工中采用合理的方法,能有效的防止裂縫的發生。
 

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