2013年11月上
第21期
第42卷
D01:10.7672/sgjs2013210055
技术
施工
CONSTRUCTION TECHNOLOGY
渠道混凝土衬砌板裂缝处理研究
国
李典基，曲建军，夏祥哲，刘晓杰，刘燕勋，李
（南水北调东线山东干线有限责任公司，山东济南250014）
【摘要】南水北调渠道混凝土衬砌板产生的Ⅱ类裂缝对其抗渗性能和抗冻耐久性产生不利影响，需要采取措施对裂缝进行处理。裂缝修补分为先破损再修补和直接修补两大类，综合各种处理方案，提出采用A级改性环氧树脂化学灌浆直接修补处理措施，提出在灌浆处理前先做好工艺缝的切割，将已有裂缝由活缝、生长缝变为死缝。给出了裂缝处理器材、注胶工艺流程。介绍了裂缝处理具体工序操作，分为裂缝表面处理、埋设注胶嘴、封缝、密封检查、配制灌注胶、注胶、缝口、后处理等过程。裂缝处理人工及材料成本在45~60元/m。通过对处理后的衬砌板钻
芯取样和压力试验，效果满足原设计要求，已在两潮段工程中得到实际应用。【关键词】衬砚；混凝土；裂缝；处理；灌浆
【中图分类号】U455
【文献标识码］A
【文章编号】1002-8498(2013)21-0055-03
StudyonCrackTreatmentofChannelConcreteLiningBoard
Li Dianji,Qu Jianjun,Xia Xiangzhe，Liu Xiaojie，Liu Yanxun,Li Guo
55
( Shandong Mainline Co. , Lad. of the East Route of South-to-North Water Transfer Project, Ji'nan, Shandong 250014, China) Abstract:Based on Two Channels' segment in the South-to-North Water Transfer project, the case II cracks in concrete lining board would cause adverse effects on the resistance, permeability and durability of concrete,therefor the cracks should be treated. Cracks repairing includes damage repairing method and directly repairing method. Considering every treatment plans, this paper puts forward a direct repairing measure using chemical grouting by class A modified epoxy resin, and finishes the cutting seam before the grouting treatment, and the cracks with live suture and growth suture is turned into death seam. The cracks treatment equipment and plastic injection process are given. The cracks treatment operations can be divided into crack surface processing, embedding glue injection mouth, sealing, sealing inspection, preparation of pouring sealant, glue, seam, and post treatment process, The costs of labor and material is 45 ~60 /m. Through the core sampling and pressure test of the lining plate after drilling, the treatment effect can meet the original design requirements, which has been used in Two Channels'segment engineering
Key words:lining; concrete; cracks; treatment; grouting
0
引言
南水北调东线南四湖一东平湖段输水与航运
结合工程是南水北调东线一期工程的重要组成部分，是连接胶东、鲁北输水干线的纽带和实现南四湖至东平湖通航的关键工程，该工程上接南四湖的上级湖，下至东平湖，输水线路全长108km，其中需要混凝土衬砌的渠道有近70km。南水北调两湖段输水航道边坡采用机械化衬混凝土板，衬板为大块连续薄板，厚度15cm，强度等级C25，抗冻等级
【作者简介】李典基，研究员，E-mail：dianjili@263.net
【收稿日期】2013-03-15 万方数据
F150.抗渗等级W6。由于受原材料、施工方法、环境条件等多种不利因素综合影响，如混凝土原材料、混凝土配合比设计、混凝土拌合、混凝土运输、混凝土浇筑、振揭、养护条件、温控措施、气温变化、设计等方面存在缺陷，从而在衬砌板上会产生裂缝（1-4)。根据《南水北调东线一期山东段工程混凝土结构质量缺陷管理规定》，将衬砌板裂缝分为I 类裂缝和II类裂缝。I类裂缝宽<0.2mm，缝深较浅，为龟裂或呈细微不规则状；Ⅱ类裂缝宽> 0.2mm，缝长>200cm，缝深基本穿透结构厚度。由于Ⅱ类裂缝贯穿混凝土板，显著降低了混凝土的抗渗性能，并对混凝土的抗冻耐久性产生不利影响，