Grouting device and method suitable for single-point displacement meter in tunnel engineering

Abstract

The invention discloses a grouting device and method suitable for a single-point displacement meter in tunnel engineering. The grouting device is composed of a fixed and sealed base, a grouting pipe,air and water discharging pipes and a sensor device; the sensor device is fixed to the center of the fixed and sealed base and is connected with a measuring rod provided with a protection pipe; a grouting channel and an air and water discharging channel are formed in the fixed and sealed base, wherein the grouting channel is provided with the grouting pipe, and the air and water discharging channel is provided with the air and water discharging pipes; the grouting pipe and the air and water discharging pipes both extend to the two sides of the fixed and sealed base; and the grouting finish time is determined through pulp returning of the air and water discharging pipes.

Description

technical field [0001] The invention relates to a grouting device and method suitable for single-point displacement gauges in tunnel engineering Background technique [0002] Deformation monitoring of tunnel surrounding rock is an important content during tunnel construction. The deformation information of the surrounding rock is the result of the combined effects of various factors such as the surrounding rock and the surrounding environment, and it is a true reflection of the stability of the engineering surrounding rock. The surrounding displacement of the surrounding rock is the most direct and obvious response to the change of the mechanical form of the surrounding rock and the support system, and it is the basis for establishing the feedback of the monitoring results. In the construction of tunnel engineering, displacement monitoring can not only reveal the deformation law of the surrounding rock after tunnel excavation, make judgments on the stability of the surround...

AI Technical Summary

Problems solved by technology

This causes the grouting space to be an unclosed space. When performing reverse burial grouting on the tunnel vault and arch waist, if the space is not closed, under the action of the concrete mixture's own gravity, it will seep out of the gap. , causing great troubles to the safety and efficiency of workers' construction, making it very difficult to grout in the later stage, insufficient grouting, and the anchor head cannot be anchored normally

[0007] 2. When performing reverse embedding grouting on the vault and waist of the traditional single-point displacement tunnel, since the concrete mixture is injected from bottom to top, there will be water accumulation near the anchor head of the upper measuring rod, and segregation will occur. Coupled with the air mixed in, the anchor head of the measuring rod cannot be anchored normally, which affects the accuracy of the experimental data

[0008] 3. When the traditional single-point displacement gauge is grouted, because the displacement gauge is not fixed at the beginning, the initial displacement of the anchor head and the connecting rod will affect the experimental data

[0009] 4. During the grouting of the traditional single-point displacement gauge, since the grouting process is carried out inside the surrounding rock, it is impossible to accurately judge the end time of the grouting. If the grouting is not sufficient, the anchor head cannot be anchored normally, which will affect the experimental data accuracy, if the grouting time is too long, it will cause a waste of engineering resources

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