Directional Tunnel Grouting Pressure Control for Layer Protection
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Solution Overview
Problem
The pressure of concrete grout during tunnel construction affects construction quality, risking erosion of inner structural layers due to high-pressure conditions and non-uniform grout distribution due to low-pressure conditions, impacting the stability of subsequent structural layers.
Innovation Solution
A pressure-controlled tunnel directional grouting reinforcement device with an actuated sleeve valve, coordinated blade sets, and fixed flow vanes, which adjusts grout pressure through mechanical and fluid dynamic mechanisms to ensure uniform distribution and stable injection, using sensors and processors for real-time pressure control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-pressure grouting is used to ensure complete infusion of concrete grout, then grout distribution completeness is improved, but erosion and damage to inner structural layer occurs
Solution Approach 1:
The grouting process is segmented into multiple stages with different pressure levels. The method divides the grouting sequence into initial low-pressure grouting followed by high-pressure grouting, allowing the grout to first penetrate without erosion then complete infusion under controlled pressure increments.
Solution Approach 2:
The grouting process employs periodic pressure variation rather than continuous high pressure. By alternating between pressure buildup and release cycles, the system achieves complete grout infusion while allowing structural layers to withstand pressure fluctuations without erosion damage.
2Object-affected harmful factors
If low-pressure grouting is used to avoid erosion of inner structural layer, then structural layer safety is improved, but grout distribution uniformity deteriorates
Solution Approach 1:
Low-pressure grouting is performed as a preliminary action before high-pressure grouting. This initial low-pressure stage creates safe pressure conditions that prevent erosion while establishing initial grout distribution, followed by subsequent pressure increases to achieve complete uniform infusion.
Solution Approach 2:
The grouting pressure parameter is dynamically changed throughout the process. The system transitions from low-pressure to high-pressure grouting by adjusting pressure parameters in controlled increments, maintaining structural safety while achieving uniform grout distribution through parameter optimization.
3Productivity
If high-pressure grouting is used to ensure complete grout infusion, then grouting efficiency is improved, but construction quality control becomes difficult
Solution Approach 1:
The grouting system incorporates feedback mechanisms to monitor pressure, flow rate, and grout injection volume in real-time. This feedback allows dynamic adjustment of grouting parameters to maintain optimal pressure levels that ensure complete infusion while preventing over-pressurization and quality defects.
Solution Approach 2:
The grouting process transitions from static fixed-pressure injection to dynamic adaptive pressure control. The system continuously adjusts pressure levels based on real-time monitoring of grout flow characteristics and structural response, optimizing both efficiency and quality control through dynamic parameter modification.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device effectively manages grout pressure to prevent erosion and ensure uniform distribution, enhancing construction quality and safety by maintaining consistent pressure levels during the grouting process.
Implementation Method 1
coordinated blade sets and fixed flow vanes are provided in an inner wall of the interface pipe
Implementation Method 2
A compressed rubber cap is mounted on a position of the actuated sleeve valve
Implementation Method 3
A connecting spring is arranged on an outer position of the actuated sleeve valve between the rear conical block and the fixed flow vanes
Data Source
AI summary
A pressure-controlled tunnel directional grouting reinforcement device is provided. Some embodiments of the present disclosure utilize the pressure generated during the concrete injection serves as a power source, and changes the directional movement of the front conical block, the rear conical block, and the actuated sleeve valve inside the interface pipe. This allows the concrete grout to be injected in a relatively low-pressure state and to be injected into an inner structural layer in a relatively low-pressure and stable state. The objective is to preserve the high-pressure state of the concrete grout during injection, and to reduce the damaging effects caused by high-pressure erosion of the concrete grout on the inner structural layer. To reduce the damaging effects of the high-pressure erosion on the inner structural layer by the concrete grout. An active pressure compensation is further employed to interfere with a pressure fluctuation state of the concrete grout.