城市轨道交通装配叠合整体式地下车站防水关键技术
胡正波
Key Waterproof Technologies for Integral Underground Station with Assembled Superposed Structure in Urban Rail Transit
HU Zhengbo
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作者信息:中铁第四勘察设计院集团有限公司， 430063， 武汉
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Affiliation:China Railway Siyuan Survey and Design Institute Group Co., Ltd., 430063, Wuhan, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.03.044
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中图分类号/CLCN:U231.4
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栏目/Col:应用技术
摘要:
［目的］为提高装配叠合整体式地下车站的防水性能，助力其在城市轨道交通工程中的应用，需对此类型地下车站的防水关键技术进行研究。［方法］对装配叠合整体式地下车站的混凝土抗裂防渗技术、外包防水方案及细部构造防水方案等进行了研究。［结果及结论］预制板墙构件开裂风险较大位置主要为厚度分别为500 mm和350 mm的结构表面，以及厚度为100 mm的结构中心和表面；预制顶板降温速率不宜大于2.2 ℃/h；预制墙板水蒸气养护由45 ℃降至10 ℃的时间不宜小于24 h，降温速率不宜大于1.5 ℃/h；叠合结构体系中，以受拉为主的构件宜采用水洗露骨料施工工艺，以受剪为主的构件宜采用凿毛施工工艺；温度场调控与膨胀历程调控可有效降低混凝土开裂，提高车站防水性能；车站主体结构外包防水方案，后嵌式圆形压缩密封条设计，压缩密封节点湿埋收头，以及预制板在牛腿位置的黏结措施等防水方案，提高了车站节点的防水性能。该方案在锡澄线南门站的成功应用，对于促进此类型地下车站在城市轨道交通工程中的应用，以及缩短施工工期、提升劳动生产效率、促进建筑产业转型升级等具有促进作用。
Abstracts:
［Objective］ In order to improve the waterproof performance of the integral underground station with assembled superposed structure（abbreviated as AS station）and help its application in urban rail transit projects, it is necessary to study the key waterproof technologies for such underground station. ［Method］ The concrete anti-seepage and anti-crack technology, the waterproof scheme of the station envelope and the detailed structure of the AS station are studied. ［Result & Conclusion］ The high crack risk of prefabricated panel wall components exists mainly in the surface of panel wall with thickness of 500 mm and 350 mm, the structure center and surface with thickness of 100 mm. The cooling rate of prefabricated roof slab should not exceed 2.2 ℃/h. The duration of steam curing of prefabricated panel wall from 45 ℃ to 10 ℃ should not be less than 24 h, and the cooling rate should not exceed 1.5 ℃/h. In the superposed structure system, the construction technology of water-washed aggregate should be adopted for the components mainly subjected to tension, and the chisel technology for the components mainly subjected to shear. The control of temperature field and expansion process can effectively reduce the cracking of concrete and improve the waterproof performance of the station. The external waterproof schemes for the main structure of the station, the design of the circular compression seal strip, the "wet-buried" retracting of the compression seal joint and the bonding measures of the prefabricated panel at the bracket position all improve the waterproof performance of the station joints. The successful application of this scheme in Nanmen Station of Wuxi-Jiangyin-Jingjiang Intercity Rail Transit line promotes the application of this type of underground station in urban rail transit projects, and helps to shorten the construction period, improves the on-site labor productivity, and promotes the transformation and upgrading of the construction industry.
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