城市轨道交通装配式轨道板自密实混凝土施工质量影响因素分析
仇兆明
Analysis of Factors Influencing Self-compacting Concrete Construction Quality for Prefabricated Track Slabs in Urban Rail Transit
QIU Zhaoming
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作者信息:上海申通地铁建设集团有限公司， 200070， 上海
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Affiliation:Shanghai Shentong Metro Construction Group Co., Ltd., 200070, Shanghai, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.04.030
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中图分类号/CLCN:U213.2
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栏目/Col:研究报告
摘要:
［目的］针对地铁施工空间狭窄、装配式轨道板道床施工质量难控制、自密实混凝土施工质量要求高等问题，通过现场试验方式，分析自密实混凝土施工质量的影响因素。［方法］通过试验分析了不同配合比、施工工装、施工技术、混凝土运输时长和施工环境等对自密实混凝土质量的影响。［结果及结论］自密实混凝土配合比黏度改性剂用量宜为30 kg/m3，砂率控制在50%左右，粉煤灰用量控制在15%～25%；观察孔灌注高度宜保持在20～30 cm，宜采用“慢-快-慢”的灌注工艺，灌注时间宜为3 min以上；灌注漏斗材料宜采用2 mm以上钢板材质；中转料斗宜采用闸刀阀门。
Abstracts:
［Objective］ In response to the problems of narrow construction space, difficulty in controlling the construction quality of prefabricated track slab subgrade, and high requirements for the construction quality of self-compacting concrete in metro construction, the factors influencing the self-compacting concrete construction quality are analyzed through on-site experiments. ［Method］ The influence of different mix proportions, construction fixtures, construction techniques, concrete transportation duration, and construction environment on the quality of self-compacting concrete is analyzed through experiments. ［Result & Conclusion］ The appropriate dosage of viscosity modifier for self-compacting concrete optimal mix proportion should be 30 kg/m3, a sand ratio of approximately 50% and a fly ash amount controlled within 15% to 25%. The infusion height of observation holes should be maintained between 20 to 30 cm, employing a ′slow-fast-slow′ infusion technique with an infusion time of at least 3 minutes. The material for pouring funnels should preferably be made of steel plates with a thickness of 2 mm or more, and gate valves should be used for intermediate hoppers.
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