装配式混凝土结构接头无损检测方法研究
发布时间：2018-07-23 10:28
【摘要】：随着国家经济和技术的飞速发展,国家城镇化建设速度的加快,新建工程数量今后在相当长一段时间内仍将持续高速增长,其中钢筋混凝土框架结构是应用广泛的结构形式。将框架结构与新型装配式建筑技术结合,改变传统的混凝土主体结构以现浇为主的建造方式,采用施工质量高、速度快、资源节约和环境友好的装配式混凝土框架结构进行设计与施工。近几年,在全国建造了许多装配式混凝土结构建筑,结构中采用大量钢筋套筒对钢筋进行连接,钢筋套筒内部灌浆料的密实性影响着钢筋连接质量,甚至影响整座房屋建筑的质量与安全。但是目前还没有相应的无损检测方法对钢筋套筒内的灌浆料密实性进行检测。本课题通过对已有的几种无损检测方法研究后,选择超声波法检测灌浆料密实性,简单介绍了超声波检测的性能和原理。灌浆料在钢筋套筒连接接头中起到力的传递作用,并根据施工工艺要求需具备良好的流动性能。所以,本文对三种灌浆料的抗压强度和流动度进行了试验研究,按照国家相应规范,选出符合要求的灌浆料产品。钢筋套筒的外观尺寸偏差值应该在规定范围内,如实测值与设计值有较大偏差,则会严重影响钢筋套筒在结构中的受力性能。本文对试验所用的钢筋套筒外观尺寸进行检测,结果满足规范要求。用超声波检测钢筋套筒连接构件内几种介质的声速值,把声速值代入相应的公式,得出超声波在钢筋套筒内传播的声速理论值。实测超声波在灌浆料密实的钢筋套筒内传播的声速值与理论值进行比较,确定超声波在钢筋套筒内的传播路径。用超声波首波声时法检测灌浆料存在脱空缺陷的钢筋套筒,对脱空缺陷进行定性分析,并提出一种检测方法以确保能对脱空缺陷进行定量分析,试验结论表明无论定性还是定量分析都能起到检测的目的和要求。浇筑混凝土试件,灌浆料密实的和带有灌浆料脱空缺陷的钢筋套筒事先预埋在试件内,用超声波对测法检测混凝土试件,根据声速值并借助于波幅值,对钢筋套筒内的灌浆料脱空缺陷进行定性和定量分析。试验结论是能够对与竖向钢筋连接的钢筋套筒内的灌浆料脱空缺陷进行检测,对与横向钢筋连接的钢筋套筒检测效果不明显。本文详细的归列出超声波检测仪的操作步骤,并介绍了在实际工程中对钢筋套筒内的灌浆料密实性进行超声波检测的方法。按照国家相应规范,对灌浆料密实的和带有缺陷的钢筋套筒进行单向拉伸试验,结果表明试验所用的钢筋套筒连接接头只有灌浆料密实时,才可以满足相应的钢筋连接要求。本文还对实际工程中钢筋套筒连接接头进行单向拉伸性能检测,并给出检测结果。
[Abstract]:With the rapid development of national economy and technology and the acceleration of urbanization construction, the number of new construction projects will continue to increase at high speed for a long time in the future. The reinforced concrete frame structure is a widely used structure form. The frame structure is combined with the new assembly building technology to change the traditional construction mode of the main body structure of concrete with cast-in-place construction. The construction quality is high and the speed is fast. Design and construction of prefabricated concrete frame structure with resource saving and environment friendly. In recent years, many prefabricated concrete structures have been built in China, in which a large number of steel bars are connected with sleeve, and the compactness of grouting material inside the reinforcement sleeve affects the quality of steel bar connection. Even affect the quality and safety of the whole building. However, there is no corresponding nondestructive testing method to detect the compactness of grouting material in reinforcement sleeve. After the research of several existing nondestructive testing methods, the ultrasonic method is selected to detect the compactness of grouting material, and the performance and principle of ultrasonic testing are introduced briefly. The grouting material plays the role of force transfer in the connection joint of steel bar sleeve and has good fluidity according to the requirement of construction technology. In this paper, the compressive strength and fluidity of three kinds of grouting materials are tested and studied, and according to the corresponding national norms, the grouting materials which meet the requirements are selected. The external dimension deviation value of steel bar sleeve should be within a specified range. If the measured value is larger than the design value, the mechanical behavior of the steel sleeve in the structure will be seriously affected. In this paper, the external dimensions of the steel sleeve used in the test are tested, and the results meet the requirements of the specification. The ultrasonic wave is used to detect the sound velocity of several kinds of media in the steel sleeve connecting member, and the sound velocity value is replaced by the corresponding formula, and the theoretical value of the sound velocity of the ultrasonic wave propagating in the reinforcement sleeve is obtained. Compared with the theoretical value, the ultrasonic propagation path of the ultrasonic wave in the reinforced steel sleeve was determined by comparing the measured ultrasonic velocity in the reinforced sleeve with the theoretical value. In this paper, the ultrasonic first wave acoustic time method is used to detect the steel sleeve with void defect in the grouting material, and the qualitative analysis of the void defect is carried out, and a testing method is put forward to ensure the quantitative analysis of the void defect. The test results show that both qualitative and quantitative analysis can meet the purpose and requirement of detection. In the concrete specimen, the reinforced sleeve with dense grouting material and defect of grouting material is embedded in the specimen in advance. The concrete specimen is tested by ultrasonic testing method, according to the sound velocity value and the Yu Bo amplitude, Qualitative and quantitative analysis were carried out on the void defect of grouting material in reinforcement sleeve. The test results show that the defect of the grouting material in the steel sleeve connected with vertical steel bar can be detected, but the effect of detecting the steel bar sleeve connected with the transverse steel bar is not obvious. In this paper, the operating steps of ultrasonic testing instrument are listed in detail, and the method of ultrasonic testing for the compactness of grouting material in steel reinforcement sleeve is introduced in practical engineering. According to the corresponding national code, uniaxial tensile tests are carried out on the reinforced steel sleeve with dense grouting materials and defects. The results show that only when the grouting material is dense, can the connecting joint of the steel bar sleeve used in the test meet the corresponding requirements of the steel bar connection. In this paper, the uniaxial tensile properties of the steel sleeve joint are also tested, and the test results are given.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU37;TU317
本文编号：2139101
[Abstract]:With the rapid development of national economy and technology and the acceleration of urbanization construction, the number of new construction projects will continue to increase at high speed for a long time in the future. The reinforced concrete frame structure is a widely used structure form. The frame structure is combined with the new assembly building technology to change the traditional construction mode of the main body structure of concrete with cast-in-place construction. The construction quality is high and the speed is fast. Design and construction of prefabricated concrete frame structure with resource saving and environment friendly. In recent years, many prefabricated concrete structures have been built in China, in which a large number of steel bars are connected with sleeve, and the compactness of grouting material inside the reinforcement sleeve affects the quality of steel bar connection. Even affect the quality and safety of the whole building. However, there is no corresponding nondestructive testing method to detect the compactness of grouting material in reinforcement sleeve. After the research of several existing nondestructive testing methods, the ultrasonic method is selected to detect the compactness of grouting material, and the performance and principle of ultrasonic testing are introduced briefly. The grouting material plays the role of force transfer in the connection joint of steel bar sleeve and has good fluidity according to the requirement of construction technology. In this paper, the compressive strength and fluidity of three kinds of grouting materials are tested and studied, and according to the corresponding national norms, the grouting materials which meet the requirements are selected. The external dimension deviation value of steel bar sleeve should be within a specified range. If the measured value is larger than the design value, the mechanical behavior of the steel sleeve in the structure will be seriously affected. In this paper, the external dimensions of the steel sleeve used in the test are tested, and the results meet the requirements of the specification. The ultrasonic wave is used to detect the sound velocity of several kinds of media in the steel sleeve connecting member, and the sound velocity value is replaced by the corresponding formula, and the theoretical value of the sound velocity of the ultrasonic wave propagating in the reinforcement sleeve is obtained. Compared with the theoretical value, the ultrasonic propagation path of the ultrasonic wave in the reinforced steel sleeve was determined by comparing the measured ultrasonic velocity in the reinforced sleeve with the theoretical value. In this paper, the ultrasonic first wave acoustic time method is used to detect the steel sleeve with void defect in the grouting material, and the qualitative analysis of the void defect is carried out, and a testing method is put forward to ensure the quantitative analysis of the void defect. The test results show that both qualitative and quantitative analysis can meet the purpose and requirement of detection. In the concrete specimen, the reinforced sleeve with dense grouting material and defect of grouting material is embedded in the specimen in advance. The concrete specimen is tested by ultrasonic testing method, according to the sound velocity value and the Yu Bo amplitude, Qualitative and quantitative analysis were carried out on the void defect of grouting material in reinforcement sleeve. The test results show that the defect of the grouting material in the steel sleeve connected with vertical steel bar can be detected, but the effect of detecting the steel bar sleeve connected with the transverse steel bar is not obvious. In this paper, the operating steps of ultrasonic testing instrument are listed in detail, and the method of ultrasonic testing for the compactness of grouting material in steel reinforcement sleeve is introduced in practical engineering. According to the corresponding national code, uniaxial tensile tests are carried out on the reinforced steel sleeve with dense grouting materials and defects. The results show that only when the grouting material is dense, can the connecting joint of the steel bar sleeve used in the test meet the corresponding requirements of the steel bar connection. In this paper, the uniaxial tensile properties of the steel sleeve joint are also tested, and the test results are given.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU37;TU317
【相似文献】
相关期刊论文 前5条
1 钱炳兴,丁玉薇;一种新颖的智能声速深度仪[J];声学技术;1992年03期
2 王富堂,王协成,侯温良;SS—1智能型声速深度仪[J];声学技术;1988年01期
3 陆忠华;;关于声测中声速异常值判定的探讨[J];山西建筑;2007年12期
4 鲁宗平;;超声回弹综合检测技术及效力[J];建筑;2013年17期
5 ;[J];;年期
相关会议论文 前1条
1 杜恒;刘东权;;超声系统声速优化模拟与算法[A];中国生物医学工程进展——2007中国生物医学工程联合学术年会论文集（上册）[C];2007年
相关硕士学位论文 前2条
1 聂东来;装配式混凝土结构接头无损检测方法研究[D];沈阳建筑大学;2014年
2 杨美霞;疏松铁冲击卸载声速与铁的高压熔化线研究[D];西南交通大学;2005年
，本文编号：2139101
本文链接：https://www.wllwen.com/guanlilunwen/chengjian/2139101.html
