A method and system for monitoring the effect of long-distance composite formation jacking pipe grouting

Abstract

The present invention belongs to the technical field of pipe jacking construction, and specifically relates to a method and system for monitoring the grouting effect of long-distance composite formation pipe jacking. The method includes: setting a pore water pressure collection location and calculating the initial grouting volume, collecting pore water pressure data before grouting and pore water pressure data during grouting; collecting mud pressure data during grouting based on the mud flow rate and grouting hole location; real-time monitoring of the pore water pressure data before grouting, the pore water pressure data during grouting, the mud pressure data, and the mud flow rate data, and timely adjusting the grouting volume; stopping grouting when the grouting requirements are met; and evaluating the grouting effect after grouting is completed. The present invention also includes a system for monitoring the grouting effect of long-distance composite formation pipe jacking. The present invention detects the real-time mud status of the pipe annulus, provides timely feedback on mud loss during the grouting process, and facilitates grouting operations, thereby meeting the grouting volume requirements of different composite formations during the long-distance pipe jacking mud grouting process.

Description

Technical Field

[0001] The invention belongs to the technical field of pipe jacking construction, and in particular relates to a method and system for monitoring the grouting effect of long-distance composite formation pipe jacking. Background Art

[0002] The effectiveness of pipe jacking grouting is crucial for the success of long-distance pipe jacking in composite formations. Currently, there's no definitive method for calculating the grouting volume. Most practices rely on empirically grouting 3-5 times the annular volume. However, grouting is typically not completed in one go; real-time grouting is required during the jacking process. When jacking in relatively stable, uniform formations, the grouting volume remains stable, with minimal variation across different sections. However, with the advancement of pipe jacking technology, an increasing number of projects are traversing composite formations, including rock, mud and gravel, sand and gravel, and water-rich formations. Consequently, grouting volumes cannot be standardized across different grouting sections. While much research has focused on friction reduction with grouting, relatively little research has been conducted on the effectiveness of grouting in pipe jacking, and even fewer on the effectiveness of grouting in composite formations. In particular, due to the diverse geological conditions in composite formations, factors affecting grout diffusion vary across different lithologies, making quantitative calculations for grouting and grouting difficult. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method and system for monitoring the grouting effect of long-distance composite formation top pipe slurry, which can instantly detect the grouting process and perform grouting and grouting according to different grouting conditions.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for monitoring the effect of long-distance composite formation jacking mud grouting, comprising the following steps:

[0005] (1) According to the length of the grouting project and the classification of the grouting stratum, set the pore water pressure collection location and calculate the initial grouting volume, and collect the pore water pressure data before grouting and during grouting;

[0006] (2) Collect mud flow rate and mud pressure data during grouting based on the grouting hole location;

[0007] (3) Monitor the pore water pressure data before grouting, the pore water pressure data during grouting, the mud pressure data, and the mud flow data in real time, and adjust the grouting volume in a timely manner;

[0008] (4) Stop grouting when the pore water pressure data during grouting is greater than or equal to the sum of the pore water pressure data before grouting and the mud pressure data during grouting;

[0009] (5) After the grouting is completed, continue to collect pore water pressure data and mud pressure data, and evaluate the grouting effect based on the pore water pressure data and mud pressure data after the grouting is completed.

[0010] Furthermore, the initial grouting volume is specifically 1.2 times the annular volume, and the annular volume is calculated by the engineering over-excavation volume.

[0011] Furthermore, the grouting amount is adjusted specifically by monitoring the pore water pressure data and the mud pressure data during grouting, and increasing the mud flow rate when the mud pressure data is greater than the pore water pressure data during grouting.

[0012] Furthermore, the grouting effect evaluation includes: when the pore water pressure data is not less than 90% of the mud pressure data within 12 hours after the grouting is completed, the grouting effect is judged to be good.

[0013] Furthermore, the grouting effect evaluation also includes: when the pore water pressure data is less than 80% of the mud pressure data within 4 hours after the grouting is completed, it is judged that the grouting effect is poor and grouting operations are required.

[0014] The present invention also includes a long-distance composite formation jacking pipe mud grouting effect monitoring system, including a pore water pressure meter, a mud pressure meter, a mud electromagnetic flow meter, a data acquisition module, a communication module, and an external platform. The pore water pressure meter is used to collect pore water pressure data around the pipe section before and after grouting, the mud pressure meter is used to collect mud pressure data at the grouting hole position during grouting, the mud electromagnetic flow meter is used to collect grouting volume around the jacking pipe, and the data acquisition module is used to process the data collected by the pore water pressure meter, the mud pressure meter, and the mud electromagnetic flow meter and The data is sent to the communication module, and the communication module transmits the data collected by the data module to the external platform; the external platform monitors the pore water pressure data before grouting, the pore water pressure data during grouting, and the mud pressure data during grouting in real time and adjusts the grouting volume. Grouting is stopped when the pore water pressure data during grouting is greater than or equal to the sum of the pore water pressure data before grouting and the mud pressure data during grouting. The pore water pressure data and mud pressure data are compared with the grouting volume around the jacking pipe collected by the mud electromagnetic flowmeter for analysis to complete the grouting effect evaluation.

[0015] Furthermore, a pore water pressure gauge is placed inside a steel pipe; the steel pipe is pre-buried inside the wall of the top pipe, a stainless steel filter is provided at the outer end of the pipe mouth, and a rotary joint is provided on the inner side of the inner end of the pipe mouth; the pore water pressure gauge is fixed on the rotary joint, and its signal line passes through the rotary joint and is provided on the inner wall of the pipe section.

[0016] Furthermore, a mud electromagnetic flowmeter is arranged at the grouting pipe inlet at the grouting position, and is connected and fixed to the grouting pipe through a flange interface.

[0017] Furthermore, a mud pressure gauge is arranged at the grouting hole position, the grouting hole is connected with the grouting pipe at the grouting position through a tee pipe, and a mud pressure gauge is arranged on the connection portion between the tee pipe and the grouting hole.

[0018] Furthermore, the communication module includes a 4G communication module and a 4G signal booster. Since pipe jacking construction is carried out underground, there is no 4G signal inside the pipe section. Therefore, a 4G signal booster needs to be installed in the pipe jacking working shaft. Depending on the length of the construction section, different numbers of 4G signal boosters are selected to ensure 4G network coverage within the pipe section. The data collected internally enters the data acquisition module and is transmitted via the 4G network to an external platform for real-time data viewing and processing, allowing grouting adjustments and grouting effect evaluation.

[0019] Compared with the prior art, the beneficial technical effects of the present invention are:

[0020] 1. Through real-time monitoring and collection of pore water pressure, mud pressure, and grouting volume, the real-time mud status of the jacking pipe annulus is detected, and timely feedback is given on mud loss during the grouting process to facilitate grouting operations. This meets the grouting volume requirements of different composite formations during long-distance jacking mud grouting, reduces the friction resistance of large-diameter jacking pipes in composite formations, and improves the grouting effect of long-distance jacking mud.

[0021] 2. For information collection of long-distance grouting, 4G signal booster and 4G communication module are used to ensure the transmission distance and accuracy of collected data. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a flow chart of the method of the present invention.

[0023] Figure 2 It is a system principle diagram of the method of the present invention.

[0024] Figure 3 This is a diagram showing the arrangement of a pore water pressure gauge according to the present invention.

[0025] Figure 4 This is a diagram showing the arrangement of a mud pressure meter and a mud electromagnetic flow meter according to the present invention.

[0026] Figure 5 It is a schematic diagram of the communication module of the present invention.

[0027] In the figure, 1 is a stainless steel filter, 2 is a pipe joint, 3 is a steel pipe, 4 is a pore water pressure gauge, 5 is a rotary joint, 6 is a mud pressure gauge, 7 is a mud electromagnetic flowmeter, 8 is a T-piece, 9 is a 4G communication module, 10 is a 4G signal enhancer, and 11 is an external platform. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0029] The present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1 As shown, the present invention also includes a method for monitoring the effect of long-distance composite formation jacking mud grouting, comprising the following steps:

[0031] (1) According to the length of the grouting project and the classification of the grouting formation, the pore water pressure collection site is set and the initial grouting volume is calculated. The pore water pressure data before grouting and the pore water pressure data during grouting are collected. The initial grouting volume is specifically 1.2 times the annular volume, and the annular volume is calculated based on the over-excavation of the project.

[0032] (2) Collect mud flow rate and mud pressure data during grouting based on the grouting hole location;

[0033] (3) Monitor the pore water pressure data before grouting, the pore water pressure data during grouting, the mud pressure data, and the mud flow data in real time, and adjust the grouting volume in a timely manner; increase the mud flow when the mud pressure data is greater than the pore water pressure data during grouting;

[0034] (4) Stop grouting when the pore water pressure data during grouting is greater than or equal to the sum of the pore water pressure data before grouting and the mud pressure data during grouting;

[0035] (5) After the grouting is completed, continue to collect pore water pressure data and mud pressure data, and evaluate the grouting effect based on the pore water pressure data and mud pressure data after the grouting is completed. If the pore water pressure data is not less than 90% of the mud pressure data within 12 hours after the grouting is completed, it proves that the quality of the mud jacket formed outside the pipe wall is good and the grouting effect is good. If the pore water pressure outside the pipe wall drops rapidly after the grouting is completed, and the pore water pressure data is less than 80% of the mud pressure data within 4 hours, it proves that a good mud jacket has not been formed outside the pipe wall, the grouting effect is poor, and grouting operations are required. The mud volume required for grouting operations is calculated by combining the initial grouting volume with the mud flow data for grouting operations.

[0036] like Figure 2As shown, the present invention also includes a long-distance composite formation top pipe mud grouting effect monitoring system, including a pore water pressure meter, a mud pressure meter, a mud electromagnetic flowmeter, a data acquisition module, a communication module, and an external platform. The pore water pressure meter is used to collect pore water pressure data around the pipe section before and after grouting, the mud pressure meter is used to collect mud pressure data at the grouting hole position during grouting, the mud electromagnetic flowmeter is used to collect grouting volume around the top pipe, and the data acquisition module is used to process the data collected by the pore water pressure meter, the mud pressure meter, and the mud electromagnetic flowmeter. The communication module transmits the data collected by the data module to the external platform; the external platform monitors the pore water pressure data before grouting, the pore water pressure data during grouting, and the mud pressure data during grouting in real time and adjusts the grouting volume. Grouting is stopped when the pore water pressure data during grouting is greater than or equal to the sum of the pore water pressure data before grouting and the mud pressure data during grouting. The pore water pressure data and mud pressure data are compared with the grouting volume around the jacking pipe collected by the mud electromagnetic flowmeter for analysis to complete the grouting effect evaluation.

[0037] like Figure 3 As shown, the pore water pressure gauge is placed in the steel pipe; the steel pipe is pre-buried inside the top pipe wall, the outer end of the pipe is provided with a stainless steel filter screen, and the inner end of the pipe is provided with a rotary joint; the pore water pressure gauge is fixed on the rotary joint, and its signal line passes through the rotary joint and is provided on the inner wall of the pipe section.

[0038] During the prefabrication phase of the pipe segment, a stainless steel pipe is welded to the segment's steel cage, protecting the pipe's two end channels as the segment is cast. After casting is complete, a stainless steel filter is welded to the outer end of the pipe. The pipe is internally threaded, and the swivel joint has external threads that mate with the pipe's internal threads. A pore-water pressure gauge is threaded onto the swivel joint and inserted into the pipe. After rotating the swivel joint to fully insert the pore-water pressure gauge into the pipe, it is wrapped with raw tape to waterproof it. The pore-water pressure gauge signal line is then routed through a through hole in the swivel joint and laid against the inner wall of the pipe segment. The stainless steel filter isolates the soil pressure signal near the pipe segment, ensuring accurate water pressure signal acquisition.

[0039] like Figure 4 As shown, the electromagnetic flowmeter is set at the grouting position where the grouting pipe enters the grouting pipe. It is connected and fixed to the grouting pipe through a flange interface. Butter is used to waterproof and seal the interface to avoid measurement errors. The mud pressure gauge is set at the grouting hole. The grouting hole is connected to the grouting pipe at the grouting position through a tee. The mud pressure gauge is set at the connection between the tee and the grouting hole. In this implementation, four grouting holes are used in the same grouting section, and four tees are set to connect the grouting pipe and the grouting hole. Each grouting hole is equipped with a mud pressure gauge on the corresponding tee. The electromagnetic flowmeter, mud pressure gauge, and pore water pressure gauge collect data and send it to the data acquisition module. The data acquisition interval in the data acquisition module is 20 seconds.

[0040] This system utilizes a main grouting pipe with annular branch grouting pipes installed at the grouting location. Multiple branch grouting pipes are connected to the main grouting pipe. Grouting ports are provided on the branch grouting pipes at the grouting locations, and slurry is delivered to each grouting location through the main grouting pipe. Due to differences in groundwater and stratum environments surrounding the construction section, mud loss and pressure fluctuations can occur during the grouting process. Real-time monitoring of pore water pressure and mud pressure data allows for timely adjustment of grouting flow rates when mud pressure outside the pipe wall dissipates and the annulus is insufficiently filled, ensuring smooth grouting in each grouting section.

[0041] like Figure 5 As shown, the communication module includes a 4G communication module and a 4G signal booster. Since pipe jacking construction takes place underground, there is no 4G signal inside the pipe section. Therefore, a 4G signal booster must be installed in the working well. Depending on the length of the construction section, a different number of 4G signal boosters are selected to ensure 4G network coverage within the pipe section. The data collected internally enters the data acquisition module and is transmitted via the 4G network to an external platform for real-time data viewing and processing, enabling grouting adjustments and grouting effect evaluation.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for monitoring the effect of long-distance composite formation jacking mud grouting, characterized in that: include: (1) According to the length of the grouting project and the classification of the grouting stratum, set the pore water pressure collection location and calculate the initial grouting volume, and collect the pore water pressure data before grouting and during grouting; (2) Collect mud flow rate and mud pressure data during grouting based on the grouting hole location; (3) Monitor the pore water pressure data before grouting, the pore water pressure data during grouting, the mud pressure data, and the mud flow data in real time, and adjust the grouting volume in a timely manner; (4) Stop grouting when the pore water pressure data during grouting is greater than or equal to the sum of the pore water pressure data before grouting and the mud pressure data during grouting; (5) After the grouting is completed, continue to collect pore water pressure data and mud pressure data, and evaluate the grouting effect based on the pore water pressure data and mud pressure data after the grouting is completed.

2. The method for monitoring the effect of long-distance composite formation jacking pipe grouting according to claim 1 is characterized in that: The initial grouting volume is specifically 1.2 times the annular space volume, and the annular space volume is calculated by the engineering over-excavation volume.

3. The method for monitoring the effect of long-distance composite formation jacking pipe grouting according to claim 1, characterized in that: The adjustment of the grouting amount specifically includes: monitoring the pore water pressure data and the mud pressure data during grouting, and increasing the mud flow rate when the mud pressure data is greater than the pore water pressure data during grouting.

4. The method for monitoring the effect of long-distance composite formation jacking pipe grouting according to claim 1, characterized in that: The grouting effect evaluation includes: when the pore water pressure data is not less than 90% of the mud pressure data within 12 hours after the grouting is completed, it is determined that the grouting effect is good.

5. The method for monitoring the effect of long-distance composite formation jacking pipe grouting according to claim 1, characterized in that: The grouting effect evaluation also includes: when the pore water pressure data is less than 80% of the mud pressure data within 4 hours after the grouting is completed, it is determined that the grouting effect is poor and grouting operations are required.

6. A long distance composite formation jacking mud grouting effect monitoring system, characterized in that: It includes a pore water pressure meter, a mud pressure meter, a mud electromagnetic flowmeter, a data acquisition module, a communication module, and an external platform. The pore water pressure meter is used to collect pore water pressure data around the pipe junction before and after grouting, the mud pressure meter is used to collect mud pressure data at the grouting hole position during grouting, and the mud electromagnetic flowmeter is used to collect grouting volume around the top pipe. The data acquisition module is used to process the data collected by the pore water pressure meter, the mud pressure meter, and the mud electromagnetic flowmeter and send the data to the communication module. The communication module transmits the data collected by the data module to the external platform; the external platform monitors the pore water pressure data before grouting, the pore water pressure data during grouting, and the mud pressure data during grouting in real time and adjusts the grouting volume. Grouting is stopped when the pore water pressure data during grouting is greater than or equal to the sum of the pore water pressure data before grouting and the mud pressure data during grouting. The pore water pressure data and the mud pressure data are compared and analyzed with the grouting volume around the top pipe collected by the mud electromagnetic flowmeter to complete the grouting effect evaluation.

7. A long distance composite formation jacking pipe grouting effect monitoring system according to claim 6, characterized in that: The pore water pressure gauge is placed in a steel pipe; the steel pipe is pre-buried inside the wall of the top pipe, a stainless steel filter is provided at the outer end of the pipe mouth, and a rotary joint is provided on the inner side of the inner end of the pipe mouth; the pore water pressure gauge is fixed on the rotary joint, and its signal line passes through the rotary joint and is provided on the inner wall of the pipe section.

8. The long-distance composite formation jacking pipe grouting effect monitoring system according to claim 6 is characterized in that: The mud electromagnetic flowmeter is arranged at the grouting position where the grouting pipe enters the grouting pipe, and is connected and fixed to the grouting pipe through a flange interface.

9. The long-distance composite formation jacking pipe grouting effect monitoring system according to claim 6 is characterized in that: The mud pressure gauge is arranged at the grouting hole position, and the grouting hole is connected with the grouting pipe at the grouting position through a tee pipe, and the mud pressure gauge is arranged on the connection part of the tee pipe and the grouting hole.

10. A long distance composite formation jacking pipe grouting effect monitoring system according to claim 6, characterized in that: The communication module includes a 4G communication module and a 4G signal enhancer.

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