城市轨道交通列检库新型预制牛腿键槽空心立柱式检查坑道床
刘观1,2,3赵海4翟贝贝1,2,3张光明1,2,3
Prefabricated Corbel Keyway Hollow Column Inspection Pit for Urban Rail Transit Inspection Depot
LIU Guan1,2,3ZHAO Hai4ZHAI Beibei1,2,3ZHANG Guangming1,2,3
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作者信息:1.北京城建设计发展集团股份有限公司， 100037， 北京
2.北京市轨道结构工程技术研究中心， 100037， 北京
3.城市轨道交通绿色与安全建造技术国家工程实验室， 100037， 北京
4.中铁二局集团有限公司， 610031， 成都
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Affiliation:1.Beijing Urban Construction Design & Development Group Co., Ltd., 100037, Beijing, China
2.Beijing Engineering Research Center of Track Structure, 100037, Beijing, China
3.National Engineering Laboratory for Green and Safe Construction Technology in Urban Rail Transit, 100037, Beijing, China
4.China Railway Erju Group Co., Ltd., 610031, Chengdu, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2025.04.046
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中图分类号/CLCN:U279.1
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栏目/Col:研究报告
摘要:
［目的］现有城市轨道交通列检库立柱式检查坑道床存在施工效率低、截面尺寸大、预埋件多等不同缺点。对此，有必要提出一种新型的预制牛腿键槽立柱式检查坑道床。［方法］介绍了新型预制牛腿键槽立柱式检查坑的预制立柱及现浇道床结构组成及设计，建立新型预制牛腿键槽立柱式检查坑道床的静力学有限元模型，计算其应力分布。归纳总结了生产制造预制牛腿键槽立柱的主要步骤及检验要求。通过场地试验验证了预制立柱的受弯性能。与普通立柱式检查坑道床比较，分析了新型预制牛腿键槽立柱式检查坑道床的优势。［结果及结论］相较于传统的现浇型矩形截面立柱，预制牛腿键槽立柱自重降低了25%；牛腿构型提高了对各类扣件的适用性并增强了横向稳定性；键槽增强了立柱与道床的联结性。静力学模型分析和抗弯试验结果表明，预制立柱结构强度满足设计要求。相比于现浇型立柱式检查坑道床，新型预制牛腿键槽立柱式检查坑道床外形美观，质量可靠，无须维护，钢筋用量相当，混凝土用量减少，单线造价虽增加了约25万元/km，但每个工作面施工速度提升了75 m/d，且每个工作面用工数量减少了约35%。
Abstracts:
［Objective］ The existing column inspection pit track bed of the urban rail transit train inspection depot has various disadvantages such as low construction efficiency, large cross-sectional size, and large embedded parts number. In this regard, it is necessary to propose a new type of prefabricated corbel keyway column (hereinafter abbreviated as PCKC) inspection tunnel bed. ［Method］ The structural composition and design of the prefabricated column and cast-in-place track bed of the new PCKC inspection pit is introduced. A static finite element model of the new PCKC inspection pit track bed is established to calculate its stress distribution. The main steps and inspection requirements for manufacturing PCKC are summarized. The bending performance of prefabricated columns is verified through field tests. Compared with ordinary column inspection pit track beds, the advantages of the new PCKC inspection pit track bed are analyzed. ［Result & Conclusion］ Compared with the traditional cast-in-place rectangular cross-section column, the PCKC reduces by 25% in self-weight; the corbel configuration improves the applicability of various fasteners and enhances the lateral stability; the keyway enhances the connection between the column and the track bed. The static model analysis and anti-bending test results show that the structural strength of the prefabricated column meets the design requirements. Compared with the cast-in-place column inspection track bed, the new PCKC inspection track bed has a beautiful appearance, reliable quality, no maintenance, equivalent steel bar consumption, and reduced concrete consumption. Although the single-line cost increases by about 250 000 yuan/km, the construction speed per working face increases by 75 m/d, reducing the number of workers/per working face by about 35%.
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