| 摘要: |
| 平陆运河是西部陆海新通道的骨干工程，是新中国成立以来建设的第一条通江达海的运河工程，马道、企石、青年三座梯级枢纽是运河建设的关键及难度最大的节点工程。针对三大枢纽船闸巨量混凝土高强度浇筑碳排放量大、炎热环境大体积混凝土温控难度大、混凝土预冷与结构通冷却循环水等现有控温措施能耗高等问题，通过结构优化设计、数值分析、现场足尺试验和应用实践等方法，开展大体积混凝土结构绿色低碳建造技术研究，创新提出了一种大体积混凝土多孔结构及绿色温控技术。研究结果表明：新型多孔结构较原设计实心结构可降低混凝土材料用量约14%，且结构受力可靠；多孔结构借助孔内通风和注常温水的措施可有效消散混凝土水化热，温控效果良好，其中孔内通风控温效果与常规冷却水管相当，孔内注入常温水控温效果最佳，可削峰约9.5℃，为推荐方案，即采用“非预混凝土+多孔结构孔内注常温水”可代替“预冷混凝土+结构通冷却循环水”的温控方案，满足设计要求。该技术在马道枢纽主导航墙进行了应用实践，节能、高效、降碳，有利于平陆运河打造绿色工程、优质工程，可为我国未来湘桂运河、赣粤运河等重大工程绿色低碳建设提供借鉴。 |
| 关键词: 平陆运河 枢纽工程 大体积混凝土结构 绿色低碳 |
| DOI： |
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| 基金项目:中国交通建设集团有限公司重大研发项目（2023-ZJKJ-13） |
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| Research and Practice on Green and Low Carbon Construction Technology for Large Volume Concrete Structure of Pinglu Canal Hub Project |
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ZHAI Shihong1, SHEN Lilong1, XIAO Jianzhuang2, DENG Zhiqiang1, HU Jun1, LIU Jie1
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1. CCCC Second Harbor Engineering Co.,Ltd.;2.School of Civil Engineering and Architecture, Guangxi University
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| Abstract: |
| The Pinglu Canal is the backbone project of the new western land-sea corridor and the first canal project built since the founding of the People's Republic of China to connect the river and the sea. The three cascade hubs of Madao, Qishi, and Qingnian are the key and most difficult nodes in the construction of the canal. The high-strength pouring concrete of the locks of the three major hubs emits a large amount of carbon dioxide, the temperature control of large-volume concrete in hot environment is difficult, and the existing temperature control measures such as concrete pre-cooling and structural cooling circulating water have high energy consumption. In view of the above problems, the research on green and low-carbon construction technology of large-volume concrete structures was carried out through structural optimization design, numerical analysis, on-site full-scale test and application practice. An innovative large volume concrete porous structure and green temperature control technology have been proposed. The research results indicate that porous structures can reduce the amount of concrete material by about 14% coMPared to solid structures, and the structural stress is reliable; The porous structure can effectively dissipate the hydration heat of concrete with the help of ventilation and injection of normal temperature water inside the pores, and the temperature control effect is good. The effect of ventilation and temperature control measures inside the pores is coMParable to that of conventional cooling water pipes. Injecting normal temperature water into the pores has the best temperature control effect, which can reduce the peak by about 9.5 ℃. As a recommended solution, the temperature control scheme of using "non pre concrete+porous structure pore injection with normal water" can replace the "pre cooled concrete+conventional structure circulating cooling water", meeting the design temperature control requirements. This technology has been applied and practiced in the leading navigation wall of the Ma Dao Hub, which is energy-saving, efficient, and carbon reducing. It is beneficial for the construction of green and high-quality projects in the Pinglu Canal, and can provide reference for the green and low-carbon construction of major projects such as the Xiang Gui Canal and the Gan Yue Canal in China in the future. |
| Key words: Pinglu Canal Hub project Large volume reinforced concrete Green and low-carbon |
