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宁波地铁车站混凝土刚性自防水技术研究及应用
作者：汤继新1，周俊宏1，王育江2，丁文圩1，张坚2，张建亮2
（1.宁波市轨道交通集团有限公司，浙江 宁波 315101；
2.江苏苏博特新材料股份有限公司 高性能土木工程材料国家重点实验室，江苏 南京 211103）
摘要：控制裂缝是刚性防水施工的关键与难点，为提升宁波地铁车站混凝土的抗裂性能，建立了基于多因素耦合机制收缩开裂评估模型，量化判定影响开裂风险因素大小与规律，在此基础上通过设计膨胀历程，基于水化温升及分阶段补偿调控原理制备抗裂混凝土，并提出抗裂性施工方法，最终形成成套技术应用于实体结构施工控制开裂风险低于0.7。监测结果表明：侧墙中心最高温升23.2 ℃，平均降温速率为0.98~1.20 ℃/d，内外温差小于3.0 ℃，变形历程变化平稳，未出现开裂。
关键词：刚性防水；地铁车站；收缩开裂；抗裂混凝土；开裂风险
中图分类号：TU57 文献标识码：A 文章编号：1001-702X（2020）09-0049-05
Research and application on concrete rigid self-waterproof technology of Ningbo metro station
TANG Jixin1，ZHOU Junhong1，WANG Yujiang2，DING Wenwei1，ZHANG Jian2，ZHANG Jianliang2
（1.Ningbo Rail Transit Group Co. Ltd.，Ningbo 315101，China；2.State Key Laboratory of
High Performance Civil Engineering Materials，Jiangsu Sobute New Materials Co． Ltd.，Nanjing 211103，China）
Abstract：Controlling cracks is a key and difficult point for construction of rigid waterproof project. In order to improve concrete crack resistance of Ningbo subway station，the shrinkage cracking evaluation model based on multi-factor coupling mechanism was established to quantify risk factors affecting cracking. On this basis，the expansion history was designed. Based on principle of hydration temperature rise and staged compensation control，the crack-resistant concrete was prepared. The crack-resistant construction methods were proposed. Finally the complete sets of crack-proof technology were applied to construction of solid structures， and the cracking risk was controlled below 0.7. The monitoring results show that the highest temperature rise of sidewall center was 23.2 ℃，the average temperature drop rate was 0.98~1.20 ℃/d，the temperature difference between center and surface was less than 3.0 ℃. At the same time, the deformation process changed continuously and smoothly and no cracking occurred.
Key words：rigid waterproof，metro station，shrinkage-cracking，anti-cracking concrete，cracking risk