混凝土
混凝土
혼응토
CONCRETE
2014年
11期
143-147
,共5页
混凝土裂缝%温度应力%温度跟踪量测%温控防裂方案
混凝土裂縫%溫度應力%溫度跟蹤量測%溫控防裂方案
혼응토렬봉%온도응력%온도근종량측%온공방렬방안
concrete cracks%temperature stress%temperature tracking measurements%temperature control and crack program
刁河渡槽工程裂缝控制要求较高，该渡槽结构在施工中出现了严重开裂现象，经过现场裂缝普查和成因分析，主要考虑是由于温度应力所致。通过对结构进行长期温度跟踪量测，表明通过采取外保（钢模外贴聚乙烯苯板对混凝土进行保温）、内降（混凝土结构内部通冷水管散热）的措施可以明显降低施工过程中结构表里温差和温度应力，据此制定了一套综合温控防裂方案，实践证明其抗裂效果显著。
刁河渡槽工程裂縫控製要求較高，該渡槽結構在施工中齣現瞭嚴重開裂現象，經過現場裂縫普查和成因分析，主要攷慮是由于溫度應力所緻。通過對結構進行長期溫度跟蹤量測，錶明通過採取外保（鋼模外貼聚乙烯苯闆對混凝土進行保溫）、內降（混凝土結構內部通冷水管散熱）的措施可以明顯降低施工過程中結構錶裏溫差和溫度應力，據此製定瞭一套綜閤溫控防裂方案，實踐證明其抗裂效果顯著。
조하도조공정렬봉공제요구교고，해도조결구재시공중출현료엄중개렬현상，경과현장렬봉보사화성인분석，주요고필시유우온도응력소치。통과대결구진행장기온도근종량측，표명통과채취외보（강모외첩취을희분판대혼응토진행보온）、내강（혼응토결구내부통랭수관산열）적조시가이명현강저시공과정중결구표리온차화온도응력，거차제정료일투종합온공방렬방안，실천증명기항렬효과현저。
Crack control for Diao river aqueduct project is much stricter,but there is a serious cracking phenomenon in the construction. Through the cracks census and analysis,the main consideration was the stress caused by temperature.Long-term temperature tracking mea-surements showed that the difference between inside and outside temperature and thermal stress of the structure can be significantly re-duced by taking the measures which combine the external insulation (pasting polyethylene benzene board on the outer surface of steel molds for insulating concrete)with lowering the internal temperature (radiating through cold water pipes).So a comprehensive tempera-ture control and crack program is proposed and its effect of resisting crack is remarkable.
