预应力孔道循环压浆质量控制指标分析

Analysis on Quality Control Index of Circulation Grouting in the Prestressed Channel

摘要: 预应力梁孔道灌浆的密实度对结构承载力和耐久性有重要影响，为了解影响循环压浆密实度的各控制指标，使用Fluent对预应力梁循环压浆进行数值模拟。结果显示，压浆料粘度、灌浆压强一定时，孔道长度越长，压浆密实度越小；孔道长度、灌浆压强一定，且满足实际工程水灰比0.26~0.28时，压浆料粘度对压浆密实度的影响很小；压浆料粘度、孔道长度一定时，若灌浆压强过小，压浆体密实度过低，随着注浆压力的提高，循环压浆的密实度显著提高，但当注浆压力提高到一定程度以后，灌浆压强对压浆密实度的改善不明显；通过多次试算，得出不同长度超长孔道的最小灌浆压强及推荐灌浆压强。分析结果可为实际工程循环压浆施工提供理论支持。

Abstract: The density of the channel grouting of prestressed beams plays an important role in the bearing capacity and durability of the structure. In order to understand the control indexes affecting the density of circulating grouting, the Fluent is used to simulate the circulating grouting of prestressed beams with the numerical method. The result shows that when the viscosity of slurry and grouting pressure is constant, the longer the channel length is, the smaller the density of grouting is. When the channel length and grouting pressure are constant and the water cement ratio is 0.26~0.28, the viscosity of the slurry has little influence on the compactness of the grouting. When the viscosity of the slurry and the length of the channel are constant, if the grouting pressure is too small, the grouting density is too low. With the increase of grouting pressure, the density of circulating grouting increases remarkably. But when the grouting pressure increases to a certain value, the influence of grouting pressure on grouting density is not obvious. And the minimum grouting pressure and the recommended grouting pressure of the super long channel with different lengths are given through multiple calculations. The analyzed result can provide theoretical support for the construction of circulating grouting in practical project.