钢壳混凝土管节组合结构注浆效果扫描成像评价方法研究

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (21) : 148-154.

论文

唐寅，车爱兰

作者信息 +

A scanning imaging evaluation method for grouting effect of a steel shell concrete tube joint structure

TANG Yin, CHE Ailan

Author information +

文章历史 +

摘要

钢壳混凝土作为一种新型结构，其在防渗、结构抗震、质量控制等方面具有显著优势，已成功应用于大型沉管隧道等土木工程中。由于施工工艺以及材料性能等原因，施工时导致结构内存在不同程度的混凝土脱空现象，影响结构的强度、刚度和承载力等性能。针对钢壳混凝土组合结构注浆效果评价问题，基于弹性波在层状介质中的传播特性，结合钢壳混凝土组合结构的组合特征，提出一种扫描成像快速评价方法。首先详细描述了扫描成像方法的基本原理、采集工艺及成像方法，提出脱空厚度和连续脱空体积两个参数作为注浆效果的评价指标。针对脱空厚度的定量评价问题，开展了不同脱空厚度的模型试验，建立了脱空厚度与响应能量放大系数之间的关系。为验证方法在深中通道钢壳混凝土管节工程应用中的适应性、有效性，开展了模型试验。试验结果表明，脱空厚度大于0.50cm的区域为检测区域的20%，脱空主要集中在构件处，最大的连续脱空体积达到1042.5cm^3。可以认为，通常的注浆方式有可能导致组合构件处发生注浆不密实等问题。并通过预设缺陷等方式，验证该方法在注浆效果评价中的有效性。

Abstract

As a new type structure, steel shell concrete has remarkable advantages in seepage prevention, seismic resistance, quality control and so on.It has been successfully applied in civil engineering, such as, large immersed tube tunnel.Due to causes of construction technology and material performance, there are different degrees of concrete filling-incompletion in construction to affect strength, stiffness and load-bearing capacity of a structure.Aiming at evaluation problems of grouting effect of steel shell concrete tube joint structure, based on propagation characteristics of elastic wave in layered medium, combined with characteristics of steel shell concrete tube joint structure, a scanning imaging rapid evaluation method was proposed.Firstly, the basic principle, acquisition process and imaging method for the scanning imaging method were described in detail to take two parameters including filling-incompletion thickness and continuous filling-incompletion volume as evaluation indexes for grouting effect.Aiming at the quantitative evaluation problem of filling-incompletion thickness, model tests for different filling-incompletion thickness were conducted to establish the relation between filling-incompletion thickness and response energy amplification coefficient.Model tests were conducted to verify the adaptability and effectiveness of the proposed method applied in Shenzhen-Zhongshan bridge steel shell concrete tube joint immersed tunnel project.The test results showed that the area with filling-incompletion thickness being greater than 0.50 cm occupies 20% of the detection area, and it is mainly concentrated at combined components; the maximum continuous filling-incompletion volume reaches 1 042.5 cm3; so, the usual grouting form is easy to cause problems of filling-incompletion at combined components; the effectiveness of the proposed method for evaluating grouting effect is verified through presetting defects.

导出引用

唐寅，车爱兰. 钢壳混凝土管节组合结构注浆效果扫描成像评价方法研究[J]. 振动与冲击, 2019, 38(21): 148-154

TANG Yin, CHE Ailan. A scanning imaging evaluation method for grouting effect of a steel shell concrete tube joint structure[J]. Journal of Vibration and Shock, 2019, 38(21): 148-154

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