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    蘇州混凝土水泥制品研究院有限公司

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    施工技術研究

    施工因素對地鐵車站側墻混凝土早期裂縫影響監測分析
    施工因素對地鐵車站側墻混凝土早期裂縫影響監測分析
    • 徐 文1,2,李忠超3,張建亮2,張 堅2,汪 洋2
    2020年第9期
    摘要
    引用本文
    摘 ? 要:監測了不同施工季節、模板材質和拆模時間等工況下某地鐵車站主體結構側墻混凝土溫度、應變歷程,分析了其對混凝土早期收縮開裂的影響。結果表明,施工時氣溫越高,側墻混凝土溫升、溫降、溫降速率以及溫降收縮越大,開裂風險也顯著上升。使用鋼模板有利于早期散熱,可顯著降低側墻混凝土的溫升與溫度峰值,降低其開裂風險。延長木模板拆模時間可減小側墻混凝土的溫降速率,利用混凝土的徐變效應抑制開裂風險。上述施工因素變化過程中,側墻混凝土的里表溫差及其引起的開裂風險總體較小。 Abstract: The temperature and strain history of sidewall concrete of a metro station main structure were monitored under conditions including different construction seasons, form materials and its removal time, based on which the effects of these conditions on the early age cracking of sidewall concrete were analyzed furtherly. The results show that the temperature rise, temperature drop, temperature drop rate and shrinkage deformation at temperature drop stage of sidewall concrete increase with the increase of air temperature during construction, and the cracking risk of sidewall concrete also rises obviously. The application of steel form helps hydration heat dissipation and decreases the temperature rise and peak of sidewall concrete significantly, as well as the cracking risk. Removing wood form later decreases the temperature drop rate and cracking risk of sidewall concrete because of creep effect. The temperature difference between center and surface of sidewall concrete and the cracking risk caused by it are always small under the above variable construction conditions.?
    徐文,李忠超,張建亮,等.施工因素對地鐵車站側墻混凝土早期裂縫影響監測分析[J].混凝土與水泥制品,2020(9):84-87. XU W,LI Z C,ZHANG J J,et al.Monitoring Analysis of Influence of Construction Factors on Early Age Cracking of Sidewall Concrete in Metro Station Engineering[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(9):84-87.
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