装配式建筑套筒灌浆连接饱满度试验与数值仿真研究

王佳辉

摘  要

近年来，装配式混凝土结构建筑在国内外得到了广泛的推广与应用，而套筒灌浆连接是其中结构连接的关键技术。然而实际施工过程中由于各种因素的影响，会存在灌浆不饱满的问题，进而导致连接结构强度的不足甚至影响建筑的整体结构性能。本文基于试验研究及有限元数值模拟，对套筒灌浆过程中不同缺陷造成的饱满度问题展开研究。具体工作如下：

（1）分析了套筒灌浆连接作用机理及质量影响因素，总结了灌浆缺陷形成的原因。针对现有检测方法存在的各种问题，基于层次分析法评价现有的套筒灌浆质量检测方法。

（2）使用研发的一套压入式管道压力检测仪，通过水和压浆料试验验证检测仪器的测量精度。使用这一检测仪器，搭建试验平台，对套筒连接件模型分别进行灌浆不饱满缺陷、存在固态缺陷、存在气泡缺陷试验，最终得到了不同缺陷条件下的构件饱满度。采用t分布检验验证了试验数据的可靠与可信程度，设定了灌浆饱满指数对灌浆质量进行评判。（3）使用Fluent有限元仿真软件,建立套筒连接件有限元模型，通过不同模型和不同参数条件的设置模拟存在的固态缺陷和气态缺陷。将有限元数值仿真的结果与试验数据进行对比分析，进而验证了试验的可靠性。

本文对套筒灌浆施工过程中饱满度问题开展研究，通过试验和有限元仿真展现了不同缺陷条件影响下的饱满度并进行了对比分析，进而得到了一种套筒灌浆施工过程中饱满度的低成本快速间接质量控制新方法。丰富了现有灌浆套筒连接的理论与实践研究，具有一定的理论意义及实际价值。

关键词：装配式建筑；套筒灌浆连接；饱满度检测；有限元分析；多相流

Abstract

In recent years, prefabricated concrete structures have been widely promoted and applied both internal and abroad. Sleeve grouting connection technology is the key technology. However, due to the influence of various factors in the actual construction process, there will be the problem of insufficient grouting, which will lead to insufficient strength of the connection structure and even affect the overall structure performance of the building. In this thesis, based on the experimental research and finite element numerical simulation, the plumpness problem caused by different defects in the process of sleeve grouting has been studied. The specific work is as follows:

(1)  The mechanism of sleeve grouting connection and the influencing factors of quality were analyzed and conclued, and the reasons for the formation of grouting defects were summarized. Aiming at the various problems existing in the existing detection methods, the existing sleeve grouting quality detection methods were evaluated based on the analytic hierarchy process.

(2) A set of press-in pipeline pressure detector was jointly developed, and the measurement accuracy of the detector was verified through water and pressure slurry tests. Using this testing instrument, An experimental platform was built, and the models were tested for incomplete grouting defects, solid defects, and bubble defects, and finally the plumpness of components under different defect conditions was obtained, The t-distribution test was used to verify the reliability and credibility of the test data, The grout saturation index was set to judge the grout quality.

(3) Using the Fluent finite element simulation software, the finite element model of the sleeve connection was established, and the existing solid defects and gaseous defects were simulated through the settings of different models and different parameter conditions. The results of the finite element numerical simulation were compared with the experimental data to verify the reliability of the experimental data.

In this thesis, the problem of fullness during sleeve grouting construction was studied. Through experiments and finite element simulations, the fullness under the influence of different defect conditions was demonstrated, and a new method for low-cost and rapid detection of fullness during sleeve grouting construction was obtained. The theoretical and practical research of the existing grouting sleeve connection was enriched, which has certain theoretical significance and practical value.

Key words: Prefabricated building, Sleeve grout connection, Fullness detection method, Finite element analysis, Multiphase flow