【摘要】：隨著國家經(jīng)濟和技術(shù)的飛速發(fā)展,國家城鎮(zhèn)化建設(shè)速度的加快,新建工程數(shù)量今后在相當(dāng)長一段時間內(nèi)仍將持續(xù)高速增長,其中鋼筋混凝土框架結(jié)構(gòu)是應(yīng)用廣泛的結(jié)構(gòu)形式。將框架結(jié)構(gòu)與新型裝配式建筑技術(shù)結(jié)合,改變傳統(tǒng)的混凝土主體結(jié)構(gòu)以現(xiàn)澆為主的建造方式,采用施工質(zhì)量高、速度快、資源節(jié)約和環(huán)境友好的裝配式混凝土框架結(jié)構(gòu)進行設(shè)計與施工。近幾年,在全國建造了許多裝配式混凝土結(jié)構(gòu)建筑,結(jié)構(gòu)中采用大量鋼筋套筒對鋼筋進行連接,鋼筋套筒內(nèi)部灌漿料的密實性影響著鋼筋連接質(zhì)量,甚至影響整座房屋建筑的質(zhì)量與安全。但是目前還沒有相應(yīng)的無損檢測方法對鋼筋套筒內(nèi)的灌漿料密實性進行檢測。本課題通過對已有的幾種無損檢測方法研究后,選擇超聲波法檢測灌漿料密實性,簡單介紹了超聲波檢測的性能和原理。灌漿料在鋼筋套筒連接接頭中起到力的傳遞作用,并根據(jù)施工工藝要求需具備良好的流動性能。所以,本文對三種灌漿料的抗壓強度和流動度進行了試驗研究,按照國家相應(yīng)規(guī)范,選出符合要求的灌漿料產(chǎn)品。鋼筋套筒的外觀尺寸偏差值應(yīng)該在規(guī)定范圍內(nèi),如實測值與設(shè)計值有較大偏差,則會嚴(yán)重影響鋼筋套筒在結(jié)構(gòu)中的受力性能。本文對試驗所用的鋼筋套筒外觀尺寸進行檢測,結(jié)果滿足規(guī)范要求。用超聲波檢測鋼筋套筒連接構(gòu)件內(nèi)幾種介質(zhì)的聲速值,把聲速值代入相應(yīng)的公式,得出超聲波在鋼筋套筒內(nèi)傳播的聲速理論值。實測超聲波在灌漿料密實的鋼筋套筒內(nèi)傳播的聲速值與理論值進行比較,確定超聲波在鋼筋套筒內(nèi)的傳播路徑。用超聲波首波聲時法檢測灌漿料存在脫空缺陷的鋼筋套筒,對脫空缺陷進行定性分析,并提出一種檢測方法以確保能對脫空缺陷進行定量分析,試驗結(jié)論表明無論定性還是定量分析都能起到檢測的目的和要求。澆筑混凝土試件,灌漿料密實的和帶有灌漿料脫空缺陷的鋼筋套筒事先預(yù)埋在試件內(nèi),用超聲波對測法檢測混凝土試件,根據(jù)聲速值并借助于波幅值,對鋼筋套筒內(nèi)的灌漿料脫空缺陷進行定性和定量分析。試驗結(jié)論是能夠?qū)εc豎向鋼筋連接的鋼筋套筒內(nèi)的灌漿料脫空缺陷進行檢測,對與橫向鋼筋連接的鋼筋套筒檢測效果不明顯。本文詳細(xì)的歸列出超聲波檢測儀的操作步驟,并介紹了在實際工程中對鋼筋套筒內(nèi)的灌漿料密實性進行超聲波檢測的方法。按照國家相應(yīng)規(guī)范,對灌漿料密實的和帶有缺陷的鋼筋套筒進行單向拉伸試驗,結(jié)果表明試驗所用的鋼筋套筒連接接頭只有灌漿料密實時,才可以滿足相應(yīng)的鋼筋連接要求。本文還對實際工程中鋼筋套筒連接接頭進行單向拉伸性能檢測,并給出檢測結(jié)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.
【學(xué)位授予單位】：沈陽建筑大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU37;TU317

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