Pipe jacking construction method with quadruple dynamic sealing and timely pressure grouting compensation

Abstract

The invention relates to a pipe jacking construction method with quadruple dynamic sealing and timely pressure grouting compensation. The pipe jacking construction method comprises the steps of constructing a quadruple dynamic sealing system, implementing dynamic sealing and timely pressure grouting compensation and continuously optimizing and feeding back. The problem of water stopping during long-distance pipe jacking construction in a high-water-pressure complex stratum is solved. By constructing a quadruple dynamic sealing system and monitoring and adjusting grouting parameters in real time, the sealing reliability and adaptability are improved, the problem that too large resistance is generated in the grouting process is avoided, the jacking efficiency and the water stopping effect are improved, and therefore the construction quality and efficiency are guaranteed, and the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of municipal engineering, and specifically to a pipe jacking construction method with quadruple dynamic sealing and timely pressure grouting compensation. Background Art

[0002] When carrying out long-distance pipe jacking construction in high water pressure and complex strata, many technical challenges are faced. Especially in a high water pressure environment of 0.3 MPa and above, the water stop problem during the steel pipe jacking process is particularly prominent. Traditional processes usually rely on the receiving well as the water stop end point, but the receiving well structure is prone to stress concentration under high water pressure, thus increasing the risk of seal system failure. At the same time, high water pressure not only increases the construction difficulty, but also may cause groundwater leakage, seriously affecting construction safety and project quality.

[0003] The causes of this problem mainly include the following aspects: High formation permeability: In high water pressure and complex strata, the formation permeability is usually high, and groundwater is abundant, making it difficult to effectively seal the gap between the steel pipe and the soil.

[0004] Difficulty in effectively sealing the gap: Due to the continuous change of the gap between the steel pipe and the soil during the pipe jacking construction process, traditional static sealing methods are difficult to adapt to this dynamic change, resulting in poor sealing effect.

[0005] Huge resistance generated during the grouting water stop process: Traditional grouting water stop methods often inject cement slurry or chemical slurry through a single grouting hole. Excessive resistance is easily generated during the grouting process, affecting the jacking efficiency and even causing the steel pipe jacking to be blocked.

[0006] Lack of real-time monitoring mechanism: Traditional technologies lack a real-time monitoring mechanism and cannot detect and handle water stop failure problems in a timely manner, bringing potential hazards to construction quality and safety.

[0007] High cost and easy damage of the receiving well: Constructing a receiving well at the predetermined position as the water stop end point not only increases the construction cost, but also the retaining structure of the receiving well is prone to structural damage under the action of high water pressure, forming a new water seepage channel. Summary of the Invention

[0008] The present invention aims to overcome the defects of the prior art and provides a pipe jacking construction method with quadruple dynamic sealing and timely pressure grouting compensation. Aiming at the pipe jacking construction methods in the prior art that mostly adopt static sealing and single grouting water stop methods, it solves problems such as poor sealing effect, untimely grouting compensation, high construction cost, and high safety risk during long-distance pipe jacking construction in high water pressure and complex strata.

[0009] In order to solve the above technical problems, the present invention is realized as follows: A pipe jacking construction method with quadruple dynamic sealing and timely pressure grouting compensation, characterized in that it includes steps of constructing a quadruple dynamic sealing system, implementing dynamic sealing and timely pressure grouting compensation, and continuous optimization and feedback.

[0010] The pipe jacking construction method with quadruple dynamic sealing and timely pressure grouting compensation is characterized in that: the construction of the quadruple dynamic sealing system includes installing and debugging a double rubber ring water stop structure, injecting bentonite slurry into the double rubber ring, setting up a thin-walled steel plate for water stop and isolating lubricating slurry and water flow, and injecting thick slurry or shield grease between the side of the pipe jacking machine and the side wall of the tunnel body.

[0011] The pipe jacking construction method with quadruple dynamic sealing and timely pressure grouting compensation is characterized in that: the implementation of dynamic sealing and timely pressure grouting compensation includes starting a pipe jacking device with high-precision control and stable performance, obtaining data through a real-time monitoring module and dynamically adjusting the grouting pressure and grouting volume, and adjusting the pressure medium inside the sealing chamber according to the data feedback.

[0012] The pipe jacking construction method with quadruple dynamic sealing and timely pressure grouting compensation is characterized in that: the continuous optimization and feedback includes regularly collecting and analyzing monitoring data, adjusting the grouting parameters and the design of the sealing chamber according to the analysis results, and feeding back the optimized parameters and design scheme to the construction team and guiding the on-site construction.

[0013] The pipe jacking construction method with quadruple dynamic sealing and timely pressure grouting compensation is characterized in that: for the setting up of the thin-walled steel plate for water stop and isolating lubricating slurry and water flow, a circle of thin-walled steel plate with a thickness of 1 mm is designed and fabricated according to the diameter and length of the pipe jacking, and is welded and fixed on the outside of the pipe jacking.

[0014] The pipe jacking construction method with quadruple dynamic sealing and timely pressure grouting compensation is characterized in that: for the injection of thick slurry or shield grease between the side of the pipe jacking machine and the side wall of the tunnel body, after installing the thin-walled steel plate at the set position before the pipe jacking penetrates through, the pipe jacking is carried out; through the grouting holes arranged in the pipeline, thick slurry or shield grease is evenly injected into the periphery of the pipe jacking synchronously with the pipe jacking.

[0015] The pipe jacking construction method with quadruple dynamic sealing and timely pressure grouting compensation is characterized in that the steps of implementing dynamic sealing and timely pressure grouting compensation are specifically as follows: First step, start a pipe jacking device with high-precision control and stable performance, and adjust the pipe jacking speed according to the formation conditions and grouting pressure; Second step, obtain data such as the groundwater level, formation pressure and grouting pressure through the real-time monitoring module, analyze the changing trends of the grouting pressure and grouting volume, and dynamically adjust the grouting pressure and grouting volume according to the analysis results; In the third step, based on the data feedback from the real-time monitoring module, judge the sealing effect of the sealed cabin, and adjust the pressure medium inside the sealed cabin in a timely manner to adapt to the gap change during the steel pipe jacking process.

[0016] The described pipe jacking construction method with quadruple dynamic sealing and timely pressure grouting compensation is characterized in that the steps of continuous optimization and feedback are specifically as follows: In the first step, regularly collect monitoring data including pressure, displacement, grouting volume, etc., and conduct statistical analysis on the data to evaluate the sealing effect and grouting efficiency; In the second step, adjust parameters such as grouting pressure, grouting volume, and grouting speed according to the data analysis results to optimize the grouting effect, and optimize the structure and materials of the sealed cabin according to the sealing effect evaluation results; In the third step, timely feedback the optimized parameters and design scheme to the construction team to guide the on-site construction, and continuously optimize the technical scheme according to the feedback from the construction team and the actual on-site situation.

[0017] The pipe jacking construction method according to claim 1 is characterized in that it further includes the step of calculating the minimum length of thick slurry or shield grease behind the thin-walled steel plate, and obtaining the minimum length through a simple calculation formula or an accurate calculation formula to ensure the sealing effect and construction efficiency.

[0018] The described pipe jacking construction method with quadruple dynamic sealing and timely pressure grouting compensation is characterized in that: 1. Calculate the minimum length L of thick slurry or shield grease behind the thin-walled steel plate: Simple calculation formula: It is calculated that L = 2.60m; Accurate calculation formula: In the formula: is the average frictional resistance between the outer wall of the pipeline and the soil (kPa), preferably taking 2 kPa - 7 kPa, and taking 2 kPa in this project; is the adjustment coefficient to ensure the safety of project implementation, taking 1.3 in this project; h is the vertical distance between the outer surface of the pipe jacking machine and the soil surface, h = 0.05m; D is the bottom diameter of the pipe jacking machine, which is 2.6m in this project, so R = 1.35m and r = 1.3m; L is the length of thick slurry or shield grease behind the thin-walled steel plate; The right side of the formula is the integral calculation formula of hydrostatic pressure, is the water pressure at the origin, is the specific weight of water; 2. Calculate the seepage flow rate Q according to Darcy's law: It is calculated that Q = 9.67× m / s to ensure that the seepage flow is within the controllable range; In the formula: Q is the fluid flow rate; K is the permeability coefficient, and the value for the soft clay in this project is 1.0× ; h is the vertical distance between the outer surface of the pipe jacking machine and the soil surface, h = 0.05 m; D is the bottom diameter of the pipe jacking machine, which is 2.6 m in this project; H / h 1 - h 2 is the water head difference between two points, which is 16 m in this project; L is the length of the thick slurry or shield grease behind the thin-walled steel plate, and the calculated value is 2.60 m.

[0019] The beneficial effects of the present invention are as follows: As can be seen from the above technical solutions, the present application provides a pipe jacking construction method with quadruple dynamic sealing and timely pressure grouting compensation. 1. Compared with the old technical solution, the new technical solution has significant differences and advantages in the following aspects: Structural difference: The new technical solution constructs a quadruple dynamic sealing system, while the old technical solution mainly adopts static sealing and a single grouting water stop method.

[0020] Practice difference: The new technical solution dynamically adjusts the grouting pressure and grouting volume through a real-time monitoring module to achieve dynamic sealing and timely pressure grouting compensation; while the old technical solution lacks such a dynamic adjustment mechanism.

[0021] Benefits: The new technical solution significantly improves the reliability and adaptability of the seal, avoids the problem of excessive resistance during the grouting process, and improves the jacking efficiency and water stop effect. At the same time, the application of the real-time monitoring module enables abnormal situations during the construction process to be detected and processed in a timely manner, further ensuring the construction quality and safety.

[0022] 2. The new technical solution solves the following technical problems from the following aspects and perspectives: Improve the reliability of the seal: By constructing a quadruple dynamic sealing system, it realizes the adaptive adjustment of the gap and pressure changes during the jacking process, significantly improves the reliability of the seal, and significantly enhances the water stop effect.

[0023] Reduce the grouting resistance: By dynamically adjusting the grouting pressure and grouting volume through the real-time monitoring module, it avoids the problem of excessive resistance during the grouting process and improves the jacking efficiency.

[0024] Improving construction quality and safety: The application of the real-time monitoring module enables the timely detection and handling of abnormal situations during the construction process, effectively avoiding construction accidents and enhancing the construction quality and safety level.

[0025] 3. Meanwhile, this construction method has the following advantages: (1) Wide application range: The double rubber ring water stop structure can be used in projects with rich groundwater, high water pressure, and large soil layer permeability, while traditional single rubber rings are generally only applicable to projects with low water pressure, small soil layer permeability, and short single jacking distance.

[0026] (2) Good sealing performance: A double rubber ring forms the first water stop structure, and high-quality, wear-resistant, and elastic rubber materials are selected for production. Through pressure testing and adjusting the compression degree, the sealing effect is ensured. Bentonite slurry is injected into the double rubber ring to form the second water stop structure, which plays a role in protecting the inner rubber ring, lubricating, and strengthening the seal. A thin-walled steel plate is set to form the third water stop structure, strengthening the water stop effect and isolating the lubricating slurry and water flow, and balancing the water pressure. Thick slurry or shield grease is injected between the side of the pipe jacking machine and the side wall of the tunnel body to form the fourth water stop structure, further strengthening the water stop effect and enhancing the sealing performance.

[0027] (3) Strong maintainability: The outer layer of the double rubber ring can be replaced after wear, and the problems of non-concentricity and preventing outward turning are solved by adjusting the external pressing plate. During the construction process, the slurry or grease can be regularly inspected and supplemented to maintain good pressure and sealing performance.

[0028] (4) High economic efficiency: Jacking construction without a receiving well underwater is realized, reducing the construction cost and improving the construction efficiency.

[0029] (5) Precise construction control: During the construction process, there are strict operation procedures and control methods from material selection, installation inspection, injection method to injection volume control and pressure balance inspection. For example, the injection volume is calculated according to the diameter, length of the pipe jacking and the permeability coefficient of the formation, and the pressure change is detected through a pressure testing device, etc., to ensure the construction quality.

[0030] The present invention not only improves the construction quality and efficiency, but also reduces the construction cost and safety risks, and has broad application prospects and promotion value. Brief Description of the Drawings

[0031] The following further elaborates on the present invention in conjunction with the drawings and embodiments: Figure 1 It is a schematic diagram of the four-layer dynamic seal for this application.

[0032] Figure 2 It is a schematic diagram for simply calculating the minimum length L of the thick slurry or shield grease behind the thin-walled steel plate.

[0033] Figure 3 Schematic diagram for accurately calculating the minimum length L of thick slurry or shield grease behind thin-walled steel plates. Specific implementation manners

[0034] The technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope claimed by the present application. As Figure 1 shown: A pipe jacking construction method with quadruple dynamic sealing and timely pressure grouting compensation includes steps of constructing a quadruple dynamic sealing system, implementing dynamic sealing and timely pressure grouting compensation, and continuously optimizing and feedback.

[0035] The constructing of the quadruple dynamic sealing system includes: Step 1: Install and debug the double rubber ring water stop structure; Form the first water stop structure by setting double rubber rings; Advantages: Double rubber rings can be used in projects with rich groundwater, high water pressure, and large soil layer permeability. The outer layer can be replaced after wear. By adjusting the external pressing plate, eccentricity can be solved and outward turning can be prevented. In traditional projects, single rubber rings are mainly applicable to projects with low water pressure and small soil layer permeability. They cannot be replaced after wear and are generally applicable to projects with short single jacking distances.

[0036] 1.1 Preparation and installation of double rubber rings; (1) Material selection: Select high-quality, wear-resistant, and elastic rubber materials to make double rubber rings to ensure their good sealing performance during long-term pipe jacking construction.

[0037] (2) Inspection before installation: Clean the steel pipe nozzle to ensure no debris and no rust, providing a flat and clean surface for the installation of double rubber rings.

[0038] (3) Installation of double rubber rings: Use a special pressing plate tool to evenly press the double rubber rings to ensure their tight fit with the nozzle. Ensure that the inner and outer rubber rings are in the correct positions without distortion or damage.

[0039] 1.2 Debugging and detection; (1) Pressure test: After the installation of double rubber rings is completed, use the water system and pressure monitoring device of the pipe jacking machine to conduct a pressure test on the double rubber rings to verify their sealing effect under different water pressures.

[0040] (2) Adjustment and optimization: According to the test results, adjust the pressing degree of the double rubber rings to ensure their good sealing performance throughout the pipe jacking construction process.

[0041] Step 2: Inject bentonite slurry into the double rubber rings Form the second water-stop structure Advantages: It can protect the inner rubber ring, lubricate, and strengthen the sealing effect 2.1 Prepare bentonite slurry; (1) Material preparation: Select high-quality bentonite, mix it with water according to a predetermined ratio, and stir evenly to form a slurry with high viscosity and low permeability.

[0042] (2) Mud quality control: Detect the performance indicators of the slurry such as viscosity and density to ensure that they meet the design requirements.

[0043] 2.2 Inject the slurry; (1) Grouting hole arrangement: Arrange the grouting holes evenly to ensure that the slurry can be evenly injected into the space between the double rubber rings.

[0044] (2) Grouting process: Use a grouting pump to inject the slurry into the space between the double rubber rings until the space is filled with slurry and reaches the predetermined grouting pressure.

[0045] (3) Inspection of grouting effect: After the grouting is completed, observe the slurry outflow at the grouting holes and use a pressure test device to detect the grouting pressure to ensure that the slurry is evenly injected and the expected water-stop effect is achieved.

[0046] Step 3: Set up a thin-walled steel plate for water stop and isolate the lubricating slurry and water flow Form the third water-stop structure and isolate Advantages: Strengthen the water-stop effect and isolate the lubricating slurry and water flow to ensure that the water pressure on one side is balanced by thick slurry or shield grease on the other side.

[0047] According to the diameter and length of the pipe jacking, design and fabricate a circle of thin-walled steel plates (about 1 mm thick) and weld them to the outside of the pipe jacking. Step 4: Inject thick slurry or shield grease between the side of the pipe jacking machine and the side wall of the tunnel to enhance the sealing performance Form the fourth water-stop structure Advantages: Strengthen the water-stop effect, enhance the sealing performance, realize the pipe jacking construction without a receiving well underwater, and reduce costs and increase efficiency.

[0048] 4.1 Material preparation and injection method; (1) Material selection: Select special thick slurry or shield grease to ensure that it has good lubricity and water-stop performance.

[0049] (2) Injection method: Set the position before the pipe jacking is pushed through, install the thin-walled steel plate and then jack; inject the thick slurry (flowing plastic to soft plastic) or shield grease evenly around the pipe jacking synchronously with the jacking through the grouting holes set in the pipeline.

[0050] (3)Injection volume control: Calculate the required injection volume based on the diameter and length of the pipe jacking and the permeability coefficient of the formation. Fill thick clay slurry behind the thin-walled steel plate to ensure an appropriate filling volume of the slurry, which can balance the internal and external pressures.

[0051] (4)Pressure balance check: Detect the pressure changes on both sides of the thin-walled steel plate through a pressure testing device to ensure an appropriate filling volume of the slurry and achieve the expected balance effect. At the same time, regularly check and supplement the slurry to maintain the stability of the pressure balance.

[0052] (5)Subsequent construction: Under the protection of the thin-walled steel plate and the slurry layer, continue to push the pipe jacking construction until the entire project is completed.

[0053] 4.2 Inspection and maintenance of injection effect; Regular maintenance: During the pipe jacking construction process, regularly check and supplement the slurry or grease to ensure that it always maintains good pressure and sealing performance.

[0054] Construct and apply a quadruple dynamic sealing system during the pipe jacking construction process. The quadruple dynamic sealing system is sequentially provided with multiple water-stop structures to adaptively adjust the gap and pressure changes during the pipe jacking construction process, ensuring the reliability of the seal and the water-stop effect; The implementation of dynamic sealing and timely pressure grouting compensation includes: The first step: Selection of jacking equipment startup: Select jacking equipment with high-precision control and stable performance to ensure the precise control of the jacking speed and force.

[0055] Intelligent pipe jacking machine or hydraulic jacking equipment, parameter requirements: Jacking speed: 0 - 10 m / h (adjustable), Jacking force: Selected according to the pipe diameter and formation conditions, such as ≥100 t, ≥200 t, etc., Control accuracy: ±1 mm (displacement control) and ±0.1 MPa (pressure control), Stability: Can still maintain stable jacking under complex geological conditions without obvious shaking or deviation Jacking speed control: Adjust the jacking speed according to the formation conditions and grouting pressure to avoid seal failure or uneven grouting caused by too fast or too slow speed.

[0056] The second step: Real-time monitoring of dynamic adjustment of grouting pressure and grouting volume: Obtain data such as the underground water level, formation pressure, and grouting pressure through a real-time monitoring module.

[0057] Data analysis: Analyze the change trends of the grouting pressure and grouting volume based on the monitoring data and predict the future change trends.

[0058] Adjustment strategy: Adjust the grouting pressure and grouting volume according to the analysis results to ensure that the grouting pressure maintains a dynamic balance with the formation pressure, and the grouting volume is sufficient and not excessive.

[0059] Step 3: Adaptive sealing chamber adjustment and monitoring data feedback: Judge the sealing effect of the sealing chamber according to the data feedback of the real-time monitoring module.

[0060] Sealing force adjustment: Adjust the pressure medium inside the sealing chamber according to the sealing effect to make the sealing force adapt to the gap change during the steel pipe jacking process.

[0061] The continuous optimization and feedback include: Step 1: Data analysis and evaluation data collection: Regularly collect monitoring data, including pressure, displacement, grouting volume, etc.

[0062] Data analysis: Statistically analyze the collected data to evaluate the sealing effect and grouting efficiency.

[0063] Step 2: Parameter optimization Grouting parameter adjustment: Adjust parameters such as grouting pressure, grouting volume, and grouting speed according to the data analysis results to optimize the grouting effect.

[0064] Sealing chamber design optimization: Optimize the structure and materials of the sealing chamber according to the sealing effect evaluation results to improve the sealing performance.

[0065] Step 3: Feedback and improvement Construction team feedback: Feed back the optimized parameters and design scheme to the construction team to guide the on-site construction. Continuous improvement: Continuously optimize the technical scheme according to the feedback of the construction team and the actual on-site situation to improve the construction quality and efficiency.

[0066] The relevant calculations are as follows: Such as Figure 2 、 3 shown: 1. Calculate the minimum length L of thick slurry or shield grease behind the thin-walled steel plate: Simple calculation formula: It is calculated that L = 2.60m; Accurate calculation formula: In the formula: is the average frictional resistance between the outer wall of the pipeline and the soil (kPa), preferably taking 2 kPa - 7 kPa, and 2 kPa is taken in this project; is the adjustment coefficient to ensure the safety of project implementation, and 1.3 is taken in this project; h is the vertical distance between the outer surface of the pipe jacking machine and the soil surface, h = 0.05m; D is the bottom diameter of the pipe jacking machine. In this project, it is 2.6m, so R = 1.35m and r = 1.3m; L is the length of thick slurry or shield grease behind the thin-walled steel plate; On the right side of the formula is the calculation formula for the integral of hydrostatic pressure, is the water pressure at the origin, is the specific weight of water; Second, calculate the seepage flow rate Q according to Darcy's law: It is calculated that Q = 9.67× m / s to ensure that the seepage flow rate is within the controllable range; In the formula: Q is the fluid flow rate; K is the permeability coefficient, and the value for the soft clay in this project is 1.0× ; h is the vertical distance between the outer surface of the pipe jacking machine and the soil surface, h = 0.05m; D is the bottom diameter of the pipe jacking machine, which is 2.6m in this project; H / h 1 - h 2 is the head difference between two points, which is 16m in this project; L is the length of the thick slurry or shield grease behind the thin-walled steel plate, and the calculated value is 2.60m.

[0067] The innovation of the present invention lies in the dynamic sealing mechanism of the quadruple water stop structure; Double rubber ring water stop structure (the first layer) Dynamic property: The double rubber ring design allows for adjusting the external pressing plate during the jacking process to adapt to misalignment and gap changes. When the steel pipe is jacked, due to the complexity and uncertainty of the formation, the gap between the pipe orifice and the soil may change. The double rubber ring structure can closely fit the pipe orifice by adjusting the external pressing plate to prevent eversion and leakage.

[0068] Sealing property: High-quality, wear-resistant, and elastic rubber materials ensure that the double rubber rings maintain good sealing performance during long-term pipe jacking construction.

[0069] Bentonite slurry water stop structure (the second layer) Dynamic property: Bentonite slurry has fluidity and can fill the tiny gaps between the double rubber rings and flow with the gap changes during the jacking process to maintain the sealing effect.

[0070] Sealing property: The high viscosity and low permeability of bentonite slurry enable it to effectively prevent groundwater seepage and at the same time play a lubricating role to reduce the jacking resistance.

[0071] Thin-walled steel plate water stop structure (the third layer) Dynamic property: The thin-walled steel plate is designed to isolate the lubricating slurry and water flow to ensure water pressure balance. During the jacking process, the steel plate can move with the steel pipe to adapt to the formation deformation and gap changes.

[0072] Sealing performance: The steel plate itself has good rigidity and sealing performance, which can effectively prevent the leakage of groundwater.

[0073] Thick slurry or shield grease water-stop structure (the fourth layer) Dynamic property: The thick slurry or shield grease is injected into the periphery of the jacking pipe synchronously with the jacking process through the grouting holes, filling the gap between the steel plate and the formation, and being continuously supplemented and adjusted as the jacking process progresses to maintain the sealing effect.

[0074] Sealing performance: The thick slurry or shield grease has good lubricity and water-stop property, which can form a continuous sealing layer to prevent the leakage of groundwater.

[0075] The four-layer water-stop structure does not exist in isolation, but works together synergistically. Each layer of the water-stop structure undertakes different sealing tasks, while complementing and strengthening each other. Through the combined action of the four-layer water-stop structure, the adaptive adjustment of the gap and pressure changes during the jacking pipe construction process is achieved, thus ensuring a dynamic sealing effect; not only improving the construction quality and efficiency, but also reducing the construction cost, with significant economic and social benefits.

[0076] Implementing dynamic sealing and timely pressure grouting compensation is to solve the water-stop problem during the long-distance jacking pipe construction in complex strata with high water pressure. By constructing a four-layer dynamic sealing system and real-time monitoring and adjusting the grouting parameters, the reliability and adaptability of the sealing are improved, the problem of excessive resistance during the grouting process is avoided, the jacking efficiency and water-stop effect are enhanced, thereby ensuring the construction quality and efficiency and reducing the cost.

[0077] The above are only the embodiments provided by this application and are not used to limit this application. Although this application has been described in detail with reference to the embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A pipe jacking construction method with quadruple dynamic sealing and timely pressure grouting compensation, characterized in that: It includes steps of building a quadruple dynamic sealing system, implementing dynamic sealing and timely pressure grouting compensation, and continuous optimization and feedback.

2. According to claim 1, a pipe jacking construction method with quadruple dynamic sealing and timely pressure grouting compensation is characterized in that: The construction of the quadruple dynamic sealing system includes installing and debugging a double rubber ring water-stopping structure, injecting bentonite slurry into the double rubber ring, setting a thin-walled steel plate water-stopping and isolating lubricating slurry and water flow, and injecting thick slurry or shield grease between the side of the pipe jacking machine and the side wall of the tunnel.

3. The pipe jacking construction method with quadruple dynamic sealing and timely pressure grouting compensation according to claim 1 is characterized in that: The implementation of dynamic sealing and timely pressure grouting compensation includes starting jacking equipment with high-precision control and stable performance, acquiring data through a real-time monitoring module and dynamically adjusting the grouting pressure and grouting volume, and adjusting the pressure medium inside the sealing cabin according to data feedback.

4. The pipe jacking construction method with quadruple dynamic sealing and timely pressure grouting compensation according to claim 1 is characterized in that: The continuous optimization and feedback include regularly collecting and analyzing monitoring data, adjusting grouting parameters and sealed chamber design according to the analysis results, and feeding back the optimized parameters and design solutions to the construction team to guide on-site construction.

5. The pipe jacking construction method with quadruple dynamic sealing and timely pressure grouting compensation according to claim 2 is characterized in that: The thin-walled steel plate is provided to stop water and isolate the lubricating mud and water flow. A circle of thin-walled steel plate with a thickness of 1 mm is designed and manufactured according to the diameter and length of the top pipe and is welded and fixed on the outside of the top pipe.

6. A pipe jacking construction method with quadruple dynamic sealing and timely pressure grouting compensation according to claim 2, characterized in that: Thick mud or shield grease is injected between the side of the jacking machine and the side wall of the tunnel, the position is set before the jacking pipe is pushed through, and the jacking is carried out after the thin-walled steel plate is installed; the thick mud or shield grease is evenly injected around the jacking pipe through the grouting holes arranged in the pipeline as the jacking is carried out.

7. A pipe jacking construction method with quadruple dynamic sealing and timely pressure grouting compensation according to claim 3, characterized in that The steps of implementing dynamic sealing and timely pressure grouting compensation are specifically as follows: The first step is to start the jacking equipment with high-precision control and stable performance, and adjust the jacking speed according to the formation conditions and grouting pressure; The second step is to obtain data such as groundwater level, formation pressure and grouting pressure through the real-time monitoring module, analyze the changing trend of grouting pressure and grouting volume, and dynamically adjust the grouting pressure and grouting volume according to the analysis results; The third step is to judge the sealing effect of the sealing cabin based on the data feedback from the real-time monitoring module, and adjust the pressure medium inside the sealing cabin in time to adapt to the gap changes during the steel pipe jacking process.

8. A pipe jacking construction method with quadruple dynamic sealing and timely pressure grouting compensation according to claim 4, characterized in that The steps of continuous optimization and feedback are specifically as follows: The first step is to regularly collect monitoring data including pressure, displacement, grouting volume, etc., and conduct statistical analysis on the data to evaluate the sealing effect and grouting efficiency; The second step is to adjust the parameters such as grouting pressure, grouting volume and grouting speed according to the data analysis results to optimize the grouting effect, and optimize the structure and materials of the sealing cabin according to the sealing effect evaluation results; The third step is to promptly feedback the optimized parameters and design plans to the construction team to guide on-site construction, and continuously optimize the technical plan based on the feedback from the construction team and the actual situation on site.

9. The pipe jacking construction method according to claim 1, characterized in that: It also includes the steps of calculating the minimum length of thick mud or shield grease behind the thin-walled steel plate, and obtaining the minimum length through a simple calculation formula or an accurate calculation formula to ensure the sealing effect and construction efficiency.

10. A pipe jacking construction method with quadruple dynamic sealing and timely pressure grouting compensation according to claim 6, characterized in that:

1. Calculate the minimum length L of thick mud or shield grease behind the thin-walled steel plate: Simple calculation formula: ; The calculation shows that L = 2.60m; Exact calculation formula: ； Where: is the average frictional resistance between the outer wall of the pipeline and the soil (kPa), which should be 2kPa-7kPa. In this project, 2kPa is used; In order to adjust the coefficient and ensure the safety of project implementation, this project takes 1.3; h is the vertical distance between the outer surface of the pipe jacking machine and the soil surface, h=0.05m; D is the bottom diameter of the pipe jacking machine. In this project, it is 2.6m, so R=1.35m, r=1.3m; L is the length of thick mud or shield grease behind the thin-walled steel plate; The right side of the formula is the hydrostatic pressure integral calculation formula, is the water pressure at the origin, is the weight of water; 2. Calculate the seepage volume Q according to Darcy's law: ； The calculation results show that Q = 9.67 × m / s, ensuring that the seepage volume is within a controllable range; Where: Q is the fluid flow rate; K is the permeability coefficient, and the value of soft clay in this project is 1.0× ; h is the vertical distance between the outer surface of the pipe jacking machine and the soil surface, h=0.05m; D is the bottom diameter of the pipe jacking machine, which is 2.6m in this project; H / h1 - h2 is the water head difference between two points, which is 16m for this project; L is the length of thick mud or shield grease behind the thin-walled steel plate, which is calculated to be 2.60m.

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