CAJ | 학술논문

通过用冲击回波法比较箱梁在不同注浆饱满度下冲击回波信号的主频,研究主频对不同注浆饱满度的响应规律和无浆孔道的判断依据.根据不同类型测区的试验数据,总结出全空孔道箱梁的主频经验方程.依据实测主频对这些测区进行成像,通过比较实测主频和同等情况下全空管道的理论主频,判断孔道的注浆质量.最终判定4个测区的注浆有缺陷,凿开后验证为空洞,并给出了相应的照片.研究结果表明,冲击回波主频可以有效地评价箱梁预应力孔道的注浆饱满情况.
통과용충격회파법비교상량재불동주장포만도하충격회파신호적주빈,연구주빈대불동주장포만도적향응규률화무장공도적판단의거.근거불동류형측구적시험수거,총결출전공공도상량적주빈경험방정.의거실측주빈대저사측구진행성상,통과비교실측주빈화동등정황하전공관도적이론주빈,판단공도적주장질량.최종판정4개측구적주장유결함,착개후험증위공동,병급출료상응적조편.연구결과표명,충격회파주빈가이유효지평개상량예응력공도적주장포만정황.
As a new elastic wave method,the impact-echo method (IEM) was applied to evaluate the grouting fullness in ducts of prestressed box beam. By comparing the characteristic frequencies of different grouting fullnesses in ducts by IEM,the variation of the characteristic frequencies and the judgment of the voids in ducts were researched. On the basis of experimental data of each test area,an empirical formula of calculating characteristic frequencies of concrete deck of box beam with voids in ducts was created. Then,the color pictures were produced according to characteristic frequencies of the test areas. By comparing the test characteristic frequencies with the calculated frequencies,the quality of grouting can be determined. Finally,4 test areas were judged as having voids in the ducts which was verified by the chiseled ducts with voids and the photos of the voids. The result demonstrates that IEM is an effective method to evaluate the grouting fullness in the prestressing ducts of box beam.