水下混凝土接触回弹检测试验及其修正  

Underwater concrete contact rebound detection testing and its correction methods

作　　者：陈海宽 张凯[2] Chen Haikuan;Zhang Kai

机构地区：[1]江苏省淮安市水利工程建设管理服务中心,淮安223005 [2]南京水利科学研究院,南京210029

出　　处：《中国水利》2025年第6期48-52,共5页China Water Resources

基　　金：国家重点研发计划项目(2022YFC3005401);国家自然科学基金(52409167);水利部重大科技项目(SK-2022096)。

摘　　要：长距离输水涵洞是引调水工程的主要水工建筑物,通常深埋地下,管路多起伏,易受高速挟沙水流的长期冲刷、冲蚀,复杂水力条件及恶劣服役环境下,水下混凝土结构易出现材料性能劣化。为保障涵洞安全运行,加强水下混凝土结构强度检测至关重要。现行回弹法检测仪器只能在干地条件下使用,水下检测存在回弹仪器进水而无法显示数据等问题,常规检测装置难以在水下使用。基于此,通过向机械回弹仪内注入高压气体进行空气排水改进常规回弹仪,研发了高压气体排水的水下接触回弹装置,实现了一定深度范围内的水工建筑物水下快速无损检测,进而分析在水压作用下回弹值与干地测值之间的关系,通过室内试验率定了水下混凝土回弹转换系数。将研究成果应用于江苏省淮安市六塘河长距离地涵水下检测,对水下混凝土回弹转换系数进行了率定,并对水下回弹测值进行修正与复核,证明了水下接触回弹装置和修正方法具有可行性,可为不具备放空条件的长距离地涵水下混凝土强度检测提供技术手段。Long-distance water conveyance culverts are primary hydraulic structures in water diversion projects,typically deeply buried with undulating pipelines,making them susceptible to prolonged scouring and erosion by high-velocity sediment-laden flows.Under such complex hydraulic conditions and harsh service environments,underwater concrete structures are prone to material performance degradation.Ensuring the safe operation of these culverts necessitates strengthening the assessment of underwater concrete structural strength.Existing rebound testing instruments are designed for dry conditions and face challenges in underwater applications,such as water ingress leading to malfunction.To address this,conventional mechanical rebound hammers were modified by injecting high-pressure gas to expel water,resulting in the development of an underwater contact rebound device capable of rapid non-destructive testing of hydraulic structures within a certain depth range.By analyzing the relationship between rebound values under water pressure and those in dry conditions,underwater concrete rebound conversion coefficients were calibrated through laboratory experiments.These findings were applied to the underwater inspection of the long-distance culvert in the Liutang River,Huai’an City,Jiangsu Province,where the underwater concrete rebound conversion coefficients were calibrated,and the underwater rebound measurements were corrected and verified.The results demonstrate the feasibility of the underwater contact rebound device and correction methods,providing a technical means for assessing the strength of underwater concrete in long-distance culverts that cannot be dewatered.

关 键 词：水下回弹检测 混凝土强度检测 修正系数 长距离地涵 

分 类 号：TV43[水利工程—水工结构工程] TU528[建筑科学—建筑技术科学]