A dual-system progressive grouting and plugging device and method

Abstract

The present invention relates to the field of civil construction technology, and in particular to a dual-system progressive grouting and plugging device and method, comprising a shallow grouting pipe and a deep grouting pipe sleeved inside the shallow grouting pipe, and also comprising an inter-pipe partition component arranged between the shallow grouting pipe and the deep grouting pipe; wherein the shallow grouting pipe is provided with a grouting hole, a grouting outlet, and a grouting inlet on the pipe wall; and the deep grouting pipe is provided with a water-permeable hole and a water outlet on the pipe wall, and a water filter membrane bag is sleeved on the outer side of the pipe wall. Through the above arrangement, during the grouting of the shallow grouting pipe, the deep grouting pipe plays the role of draining water and relieving pressure. Under the premise of ensuring the safety and sealing effect of the initial plugging of the shallow system, the deep grouting pipe is then used to plug the deep system, effectively plugging water leakage in underground projects, especially having a more significant reinforcement effect on plugging water leakage of large water volumes and high-pressure water. The device has a simple structure, a short construction period, low cost, strong applicability, safety and reliability, and has excellent application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of civil construction, and in particular to a dual-system progressive grouting and plugging device and method. Background Art

[0002] With the rapid development of my country's economy and population growth, the demand for urban building space is constantly increasing, and the expansion of underground space has become a focus of urban construction and development. Due to the diverse and complex terrain in my country, the construction of various roads, bridges, and dams involves underground space construction. During these construction operations, they are bound to be affected by various types of groundwater. When the water volume and water pressure are low, the diversion and drainage methods can be used for treatment, and then grouting and plugging technology can be used for plugging and reinforcement. Traditional grouting and plugging technology mainly uses plugging materials to directly plug the leaking parts. However, when the water pressure is high, the plugging materials cannot effectively plug the leaking parts, and are only suitable for projects where the leakage is not serious.

[0003] At present, the existing grouting and plugging devices mainly use a grouting pipe with a water filter pipe at the bottom to directly grout the bottom of the hole after the construction of the grouting hole is completed, and use the (rapid) self-setting effect of the slurry to plug water leakage and reinforce the soil. For example, a deep foundation pit plugging device disclosed in application number CN201921052647.3 (publication date is April 17, 2020). Although the above device can improve the efficiency of plugging foundation pit leakage, when the water pressure on the side wall of the foundation pit is too high, the plugged mud is still easily broken, and the mud and water in the confined space under high pressure can easily cause backflow, resulting in mud loss and waste.

[0004] Especially in the process of sealing water leakage with large water volume and high pressure, the existing grouting sealing device has the problems of long construction period, unsafe construction and large waste of materials, and it is difficult to form effective anti-seepage. Once encountering natural disasters such as rising water levels in rainy season and strong earthquakes, it is easy to cause the sealing failure, causing a series of safety problems. Summary of the Invention

[0005] In order to solve the problem of poor sealing effect of the grouting plugging device in the above-mentioned prior art, the present invention provides a dual-system progressive grouting plugging device, comprising a shallow grouting pipe and a deep grouting pipe sleeved inside the shallow grouting pipe, wherein an inter-pipe space is formed between the shallow grouting pipe and the deep grouting pipe; and further comprising an inter-pipe partition member arranged in the inter-pipe space;

[0006] The inter-pipe partition component divides the socketed shallow grouting pipe and deep grouting pipe into a first grouting section, a partition section, and a second grouting section along the length direction; the inter-pipe partition component is arranged at the partition section and is used to seal and separate the inter-pipe space located in the first grouting section from the inter-pipe space located in the second grouting section;

[0007] A grouting hole and a plurality of slurry outlet holes are opened on the wall of the shallow grouting pipe located in the first grouting section, and the slurry outlet holes are arranged between the grouting hole and the inter-pipe partition component;

[0008] A plurality of grouting holes are opened on the wall of the shallow grouting pipe located in the second grouting section;

[0009] A plurality of water-permeable holes are opened on the wall of the deep grouting pipe located in the second grouting section and the separation section;

[0010] A water filter membrane bag is sleeved on the outer side of the wall of the deep grouting pipe located in the second grouting section;

[0011] The deep grouting pipe located in the first grouting section is provided with a water outlet.

[0012] In one embodiment, the inter-tube partitioning component includes an expandable anchor and an inter-tube water filter membrane bag;

[0013] The inter-tube water filter membrane bag is sleeved on the outer side of the pipe wall of the deep grouting pipe located in the separation section, and the inter-tube water filter membrane bag is used to inject cement slurry and fill the inter-tube space of the separation section; the expansion anchor is arranged in the inter-tube space close to the side of the first grouting section to block the cement slurry from entering the inter-tube space of the separation section.

[0014] In one embodiment, a grouting branch pipe is welded to the grouting hole.

[0015] In one embodiment, the bottom of the shallow grouting pipe located in the second grouting section is configured as a guide shell, through which the shallow grouting pipe is connected to the outside world, and the guide shell extends outward from the bottom of the pipe and is truncated into a cone shape.

[0016] In one embodiment, a hole seal is further included, which is arranged on the outside of the shallow grouting pipe located at the first grouting section to seal the borehole to be plugged.

[0017] In one embodiment, the shallow grouting pipe is a quarter-inch steel pipe, and the deep grouting pipe is a six-inch steel pipe.

[0018] The present invention further provides a dual-system progressive grouting and plugging method, which uses the dual-system progressive grouting and plugging device described in any of the above embodiments, and includes the following steps:

[0019] Use a drilling rig to perform positioning drilling to form a borehole to be plugged;

[0020] Fixing the assembled dual-system progressive grouting and plugging device in the borehole to be plugged, so that an outer pipe space is formed between the dual-system progressive grouting and plugging device and the borehole to be plugged, and sealing the outer pipe space with a hole seal;

[0021] Cement slurry is injected into the grouting holes of the dual-system progressive grouting and plugging device until the cement slurry fills the space outside the pipe and at least part of the space between the pipes in the first grouting section and the second grouting section, and then the grouting is stopped; wherein, water is discharged from the water-permeable holes of the deep grouting pipe and the pressure is relieved by the action of the water filter membrane bag; after the cement slurry solidifies, the grouting and plugging of the shallow system is completed;

[0022] The bottom of the deep grouting pipe of the dual-system progressive grouting and plugging device is opened, and cement slurry is injected into the deep grouting pipe until the cement slurry completely fills the deep grouting pipe and the space between the pipes, and then the grouting is stopped; after the cement slurry solidifies, the grouting and plugging of the deep system is completed.

[0023] Based on the above, compared with the prior art, the dual-system progressive grouting and plugging device provided by the present invention effectively blocks water leakage in underground projects by setting up shallow grouting pipes and deep grouting pipes. In particular, the reinforcement effect on blocking water leakage caused by large amounts of water and high-pressure water is more significant. During the grouting of the shallow grouting pipe, the deep grouting pipe plays the role of draining water and relieving pressure. Under the premise of ensuring the safety and sealing effect of the initial plugging of the shallow system, the deep grouting pipe is used to plug the deep system. It has a simple structure, short construction period, low cost, strong applicability, safety and reliability, and has excellent application prospects.

[0024] Other features and beneficial effects of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The objectives and other beneficial effects of the present invention can be achieved and obtained by the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work. The positional relationships described in the drawings in the following description are based on the directions of the components drawn in the diagrams, unless otherwise specified.

[0026] Figure 1A schematic cross-sectional view of a dual-system progressive grouting and plugging device according to an embodiment of the present invention;

[0027] Figure 2 A cross-sectional structural flow chart of manufacturing an inter-tube partition component provided in one embodiment of the present invention;

[0028] Figure 3 A schematic cross-sectional view of a dual-system progressive grouting and plugging device provided in one embodiment of the present invention being placed into a borehole;

[0029] Figure 4 A schematic cross-sectional view of a dual-system progressive grouting and plugging device provided in another embodiment of the present invention being placed into a borehole;

[0030] Figure 5 A grouting flow diagram of the shallow system in the dual-system progressive grouting and plugging method provided by one embodiment of the present invention;

[0031] Figure 6 A schematic diagram showing the completion of grouting and plugging of the shallow system in the dual-system progressive grouting and plugging method provided by one embodiment of the present invention;

[0032] Figure 7 A grouting flow diagram of the deep system in the dual-system progressive grouting and plugging method provided by one embodiment of the present invention;

[0033] Figure 8 A schematic diagram showing the completion of grouting and plugging of the deep system in the dual-system progressive grouting and plugging method provided by one embodiment of the present invention;

[0034] Figure 9 A schematic cross-sectional view of a dual-system progressive grouting and plugging device provided by another embodiment of the present invention being placed into a borehole;

[0035] Figure 10 A schematic diagram showing the completion of grouting and plugging of a shallow system in a dual-system progressive grouting and plugging method provided by another embodiment of the present invention;

[0036] Figure 11 A schematic diagram showing the completion of grouting and plugging of a deep system in a dual-system progressive grouting and plugging method provided by another embodiment of the present invention;

[0037] Figure 12 A flowchart of the steps of a dual-system progressive grouting and plugging method provided in one embodiment of the present invention.

[0038] Reference numerals:

[0039] 10 shallow grouting pipe 20 deep grouting pipe 30 pipe partition

[0040] S1 first grouting section S2 second grouting section S3 separation section

[0041] 11 grouting hole 12 grouting hole 13 grouting hole

[0042] 21 water permeable hole 40 water filter membrane bag 22 water outlet

[0043] 31 expansion anchor 32 pipe filter membrane bag 14 sets of holes

[0044] 50 grouting branch pipe 15 guide shell 60 orifice seal

[0045] E space between pipes F space outside pipes 1 borehole to be plugged DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments; the technical features designed in different implementation modes of the present invention described below can be combined with each other as long as they do not conflict with each other; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0047] In the description of the present invention, it should be noted that all terms used in the present invention (including technical terms and scientific terms) have the same meanings as those generally understood by ordinary technicians in the field to which the present invention belongs, and should not be understood as limiting the present invention; it should be further understood that the terms used in the present invention should be understood to have meanings consistent with the meanings of these terms in the context of this specification and in the relevant fields, and should not be understood in an idealized or overly formal sense, unless explicitly defined as such in the present invention.

[0048] In order to solve the problem of poor sealing effect of the grouting sealing device in the above-mentioned prior art, please refer to Figure 1 The present invention provides a dual-system progressive grouting and plugging device, including a shallow grouting pipe 10 and a deep grouting pipe 20 sleeved inside the shallow grouting pipe 10, wherein an inter-pipe space E is formed between the shallow grouting pipe 10 and the deep grouting pipe 20. The specific dimensions of the shallow grouting pipe 10 and the deep grouting pipe 20 can be reasonably selected according to the actual working conditions and are not limited here. The design is specifically based on the borehole diameter, the integrity of the bottom layer, the amount of water leakage, etc. For example, when the amount of water is large, it is necessary to increase the diameter of the borehole 1 to be blocked and the diameters of the shallow grouting pipe 10 and the deep grouting pipe 20 to ensure the requirements of drainage and pressure relief during construction.

[0049] In this embodiment, the shallow grouting pipe 10 is preferably a four-point steel pipe, and the deep grouting pipe 20 is a six-point steel pipe.

[0050] The dual-system progressive grouting and plugging device also includes an inter-pipe partition component 30 arranged in the inter-pipe space E; the inter-pipe partition component 30 divides the shallow grouting pipe 10 and the deep grouting pipe 20 that are connected to each other into a first grouting section, a partition section S3 and a second grouting section S2 along the length direction; the inter-pipe partition component 30 is arranged at the partition section S3, and is used to seal and separate the inter-pipe space E located in the first grouting section from the inter-pipe space E located in the second grouting section S2.

[0051] The shallow grouting pipe 10 in the first grouting section is provided with a grouting hole 11 and a plurality of grouting outlets 12. The grouting outlets 12 are located between the grouting hole 11 and the inter-pipe partition 30. Preferably, a grouting branch pipe 50 is welded to the grouting hole 11 to facilitate the injection of cement grout. The ends of the shallow grouting pipe 10 in the first grouting section can be fully welded to ensure a secure seal. The grouting branch pipe 50 can be a four-branch pipe.

[0052] A plurality of grouting holes 13 are provided on the wall of the shallow grouting pipe 10 located in the second grouting section S2.

[0053] A plurality of water-permeable holes 21 are provided on the wall of the deep grouting pipe 20 located in the second grouting section S2 and the separation section S3.

[0054] A water filter membrane bag 40 is sleeved on the outer side of the wall of the deep grouting pipe 20 located in the second grouting section S2. The water filter membrane bag 40 is fixed to the outside by wrapping and bundling, and its function is to allow water to pass through but not cement slurry. The purpose of designing the outer side of the wall of the deep grouting pipe 20 is to prevent the cement slurry injected into the inter-tube space E from entering the deep grouting pipe 20 from the water-permeable hole 21, while the leakage water can enter the deep grouting pipe 20 from the inter-tube space E, thereby ensuring that most of the cement slurry slowly filters the water while completely filling the borehole 1 and cracks to be blocked and forming a dense reinforcement body that fits tightly with the rock formation, while other leakage water is drained and depressurized through the deep grouting pipe 20.

[0055] A water outlet 22 is provided on the deep grouting pipe 20 located in the first grouting section.

[0056] Specifically, the purpose of setting the inter-pipe partition component 30 is to allow the cement slurry of the first grouting section to enter the borehole 1 to be sealed (the space F outside the pipe) from the slurry outlet 12 during the shallow system grouting process, while realizing the grouting reinforcement of the shallow system on the outside, and allowing the leakage water to be discharged from the outlet 22 of the deep grouting pipe 20.

[0057] In summary, please refer to Figure 3The working principle of the dual-system progressive grouting and plugging device provided in this embodiment is: using the first grouting section of the device to reinforce the shallow surrounding broken rock to form a shallow system grouting plug; for details, please refer to Figure 5 As shown in the direction of the solid arrow, the cement slurry enters from the grouting hole 11, then fills the borehole to be blocked through the slurry outlet, and gradually fills the second grouting section S2, and then enters the inter-tube space E from the slurry inlet of the second grouting section S2 to further fill the inter-tube space E of the second grouting section S2, and finally forms the following: Figure 6 At the same time, during the grouting and plugging process of the entire shallow system, the leakage water and muddy water in the outer space F of the pipe will be passively discharged from the grouting hole 13 through the water-permeable hole 21 and the outlet 22 of the deep grouting hole 11 due to the filling of cement slurry (as shown in the figure). Figure 5 The direction of the dotted arrow indicates the drainage direction), thereby playing the role of drainage and pressure relief, making construction safer. Among them, the initial reinforcement of the shallow system can completely seal the drilled holes and outer cracks, forming a dense blockage, which prevents a large amount of high-pressure water from flushing the deep system and causing poor reinforcement effect. That is, the sealing of the deep system under the premise of stabilizing the soil provides a safe construction guarantee for the entire grouting and plugging, can quickly and effectively solve the problem of groundwater leakage, ensure the stability of ground buildings, protect vegetation from damage, and ensure the safety of people's lives.

[0058] Furthermore, after the shallow broken surrounding rock has been reinforced in the initial stage, deep high pressure water sealing is carried out. Figure 7 As shown by the arrows, cement slurry enters from the outlet hole and directly fills the remaining inter-tube space E of the partition section S3, the second grouting section S2 and the entire deep grouting pipe 20, finally forming a Figure 8 High-pressure water plugging and reinforcement of the deep system shown.

[0059] In summary, this device utilizes a dual-system design, shallow and deep, for progressive grouting. This not only enhances the shallow decompression and reinforcement effect, but also provides safe construction for deep, high-pressure water inrush, maximizing the use of cement slurry. This device can be used not only for rapid treatment and emergency rescue of foundation leakage in water conservancy projects, municipal utilities, housing construction, urban subways, and other areas, but is also suitable for various underground projects such as tunnels and subways. It can even be used for early-stage treatment of piping in dams, providing strong technical support for flood control and disaster reduction.

[0060] It should be noted that the above-mentioned setting of the various orifices of the deep grouting pipe 20 and the shallow grouting pipe 10 is not limited to the attached Figure 1As shown, the specific location, size, number, and shape of the grouting pipes can be adjusted according to actual needs and are not limited here. For example, considering the strength of the entire deep grouting pipe 20 and the shallow grouting pipe 10, the first grouting hole 13 at the end of the shallow grouting pipe 10 away from the partition S3 can be located at a distance from the bottom of the pipe, for example, at least 1 meter away from the bottom of the pipe, to ensure the overall strength of the shallow grouting pipe 10.

[0061] In a preferred embodiment, see Figure 1 、 Figure 2 The inter-pipe partition component 30 includes an expansion anchor 31 and an inter-pipe water filter membrane bag 32; the inter-pipe water filter membrane bag 32 is sleeved on the outer side of the pipe wall of the deep grouting pipe 20 located in the partition section S3, and the inter-pipe water filter membrane bag 32 is used to inject cement slurry and fill the inter-pipe space E of the partition section S3; the expansion anchor 31 is set in the inter-pipe space E close to the first grouting section S1 to block the cement slurry from entering the inter-pipe space E of the partition section S3. The above-mentioned design of the inter-pipe partition component 30 facilitates the guidance of cement slurry for plugging and reinforcing the shallow system. For the specific assembly process, please continue to refer to Figure 2 The deep grouting pipe 20 is first sleeved with the filter membrane bag 40 and the inter-tube filter membrane bag 32. The shallow grouting pipe 10 is then sleeved with the deep grouting pipe 20. Cement slurry is then injected into the inter-tube filter membrane bag 32 to fill and seal the inter-tube space E in the partition section S3. The inflatable anchor is then used to completely seal the inter-tube space E in the partition section S3, thereby allowing the inter-tube partition member 30 to completely seal the inter-tube space E. Cement slurry can be injected by extending an infusion pipe into the inter-tube filter membrane bag 32. After filling, the excess infusion pipe is removed.

[0062] In an alternative embodiment, see Figures 9 to 11The inter-tube partitioning component 30 can also be configured as follows. Specifically, it also includes an expandable anchor 31 and an inter-tube water filter bag 32. A sleeve hole 14 is formed on the wall of the shallow grouting pipe 10 located in the partitioning section S3. The inter-tube water filter bag 32 is sleeved onto the inter-tube space E of the shallow grouting pipe 10 located in the partitioning section S3 through the sleeve hole 14. A water filter bag 40 is also installed on the outer wall of the deep grouting pipe 20 located in the partitioning section S3. The expandable anchor 31 is installed in the inter-tube space E near the first grouting section to prevent cement slurry from entering the inter-tube space E of the partitioning section S3. The function of the inter-tube filter membrane bag 32 is to allow water in the outer tube space F to enter the inter-tube space E through the inter-tube filter membrane bag 32, while preventing cement particles in the outer tube space F from entering the inter-tube space E located in the partition S3. This ensures that the cement slurry in the outer tube space F flows deeper into the second grouting section S2, further guiding the cement slurry to seal and reinforce the shallow system. The function of the filter membrane bag 40 installed on the outer wall of the deep grouting pipe 20 located in the partition S3 is to allow the cement slurry in the deep grouting pipe 20 to enter the inter-tube space E located in the partition S3 to fill the inter-tube space E, prevent slurry backflow, and further serve to drain and relieve pressure.

[0063] It should be noted that the structure of the inter-tube partition component 30 is not limited to the above two embodiments. Those skilled in the art may also adopt other structures that can block the inter-tube space E as a replacement, all of which fall within the scope of protection of the present invention.

[0064] In a preferred embodiment, see Figure 4 The bottom of the shallow grouting pipe 10 located in the second grouting section S2 is set as a guide shell 15. The shallow grouting pipe is connected to the outside world through the guide shell. The guide shell 15 extends outward from the bottom of the pipe and is truncated into a cone shape.

[0065] During specific implementation, the guide shell 15 can be integrally formed with the shallow grouting pipe 10, or it can be fixed on the shallow grouting pipe 10 by other detachable or non-detachable connection methods, such as welding, clamping or threaded connection, etc. Among them, the guide shell 15 connects the shallow grouting pipe 10 with the outside of the device of the present invention. The purpose of setting the guide shell 15 is to introduce the water located in the inter-tube space E into the deep grouting pipe 20 for discharge, which is applicable to situations with a large amount of water and can further play a role in draining and relieving pressure. Of course, according to this concept, those skilled in the art can replace the truncated cone-shaped guide shell 15 with other structural shapes to achieve the guiding function, such as a stepped truncated cone, an outward-flared trumpet shape, etc.

[0066] In one embodiment, the orifice seal 60 is further included. The orifice seal 60 is disposed outside the shallow grouting pipe 10 at the first grouting section to seal the borehole 1 to be plugged. The orifice seal 60 may be a mechanically expandable grouting plug. The orifice seal 60 may also be formed by placing a geomembrane bag at the orifice and injecting cement slurry into the bag to completely fill the entire orifice.

[0067] In summary, through the design of the above-mentioned device, during the grouting of the shallow grouting pipe 10, the deep grouting pipe 20 plays the role of draining and relieving pressure. Under the premise of ensuring the safety and sealing effect of the initial plugging of the shallow system, the deep grouting pipe 20 is then used to plug the deep system, effectively plugging water leakage in underground projects, especially for solving the reinforcement effect of large-volume and high-pressure water leakage. It has a simple structure, short construction period, low cost, strong applicability, safety and reliability, and has excellent application prospects.

[0068] See also Figure 12 The present invention further provides a dual-system progressive grouting and plugging method, which uses the dual-system progressive grouting and plugging device as described in any of the above embodiments, including the following steps:

[0069] Step S10, use a drilling rig to perform positioning drilling to form a borehole 1 to be plugged. When the surface rock layer is broken or there are many water seepage points around the water seepage point, drilling may cause a larger-scale collapse of the surface layer, so an orifice pipe can be set instead of drilling. Among them, the size of both the borehole and the orifice pipe can be designed according to the actual bottom layer conditions and the amount of water leakage, and is not limited here. Preferably, according to the rock layer conditions, the drilling should not exceed the high-flow water-gushing fault, and the drilling depth should not exceed the depth of the dual-system progressive grouting plugging device by more than 1m.

[0070] Step S20, fix the assembled dual-system progressive grouting and plugging device in the borehole 1 to be plugged, so that an outer tube space F is formed between the dual-system progressive grouting and plugging device and the borehole 1 to be plugged, and seal the outer tube space F by the orifice seal 60; the installation can be carried out in a manpower or mechanically assisted manner, which is a conventional technology in this field and will not be described here. In the case of a large amount of water, the device can be fixed from at least three directions to prevent it from deviating and injuring people under the impact of high-pressure water. In order to prevent high-pressure water from scouring the borehole, after the device is fixed, the orifice seal 60 needs to be blocked and anchored in time.

[0071] Step S30, inject cement slurry into the grouting hole 11 of the dual-system progressive grouting and plugging device until the cement slurry fills the space F outside the pipe and at least part of the space E between the pipes located in the first grouting section and the second grouting section S2, and then stop grouting; wherein, water is discharged from the water-permeable holes of the deep grouting pipe and the pressure is relieved through the action of the water filter membrane bag; after the cement slurry solidifies, the grouting and plugging of the shallow system is completed.

[0072] Specifically, when grouting and plugging the shallow system, the deep drainage system relieves pressure and drains water through the water filtration effect of the high-strength geomembrane bag cloth. Cement particles can remain on the outside of the film bag tied outside the internal device, gradually forming a dense reinforcement body with a certain thickness. Through the continuous injection of cement slurry, the scope of the shallow reinforcement area will also extend to the deep layer until the filling is completed. For details, please refer to Figure 5 、 Figure 6 Optionally, a water pump can be used to assist drainage.

[0073] Step S40, open the bottom of the deep grouting pipe 20 of the dual-system progressive grouting and plugging device, and inject cement slurry into the deep grouting pipe 20 until the cement slurry completely fills the deep grouting pipe 20 and the space E between the pipes, and then stop grouting; after the cement slurry solidifies, the grouting and plugging of the deep system is completed.

[0074] In specific implementation, after the shallow system reinforcement is completed and a certain strength is formed, the deep grouting pipe 20 can be opened by high-pressure water or external mechanical means before grouting the deep system. Figure 7 、 Figure 8 As shown and described in the above working principles, they will not be repeated here. Among them, the flow rate, dosage and pressure control of grouting can be set according to actual needs and are not limited here. Optionally, the grouting speed can be 1.1 to 1.2 times the water flow rate. Optionally, for channel and fault-type seepage water, an admixture is used, and the theoretical value of 2 times the amount of Dongjing cement is calculated based on the development of rock fractures. The amount is stopped when it exceeds 1.3 to 1.5 times the theoretical value. If the grouting pressure gradually increases, the amount of admixture can be reduced. When the grouting pressure reaches 1.5 times the net water pressure, the grouting can be stopped.

[0075] It should be noted that, according to the design of the inter-tube partition 30 in the above two embodiments, a corresponding step regarding the inter-tube partition 30 is added before step S30 or in step S40. For example, in the first embodiment using only the expandable anchor 31 and the inter-tube water filter membrane bag 32 sleeved on the outer wall of the deep grouting pipe 20, please refer to Figure 2Before step S30, cement slurry must first be injected into the inter-tube filter membrane bag 32 through other water pipes to fill the inter-tube space E of the entire partition S3. After installing the expandable anchor 31, the shallow system grouting and plugging of step S30 can be carried out. For example, in the second embodiment using the expandable anchor 31, the inter-tube filter membrane bag 32 and the filter membrane bag 40 that are connected to the outer wall of the shallow grouting pipe 20 through the sleeve hole 14 are combined. Figure 10 、 Figure 11 In step S40, when cement slurry is injected into the deep grouting pipe 20, the cement slurry automatically fills the inter-pipe space E of the entire partition section S3 through the water filter membrane bag 40, and no other operations are required.

[0076] Furthermore, after the sealing and reinforcement is complete, the high-pressure, high-flow water leak can be tested for sealing. Specifically, after the high-pressure, high-flow water is completely sealed, a second hole is drilled in the same direction within 0.5m of the leak point, and an empty pipe is buried according to the design requirements to check the deep sealing effect and secondary reinforcement.

[0077] In summary, compared with the prior art, the dual-system progressive grouting and plugging device and method provided by the present invention has the following advantages:

[0078] (1) The structure is simple, its accuracy is relatively stable, and it is easy to operate. The device can be designed and assembled in advance, and only installation and grouting are required on site. This can not only greatly shorten the construction period but also effectively reduce the uncertainty caused by on-site operations, effectively avoid the increase of dangerous situations, and achieve rapid sealing;

[0079] (2) Compared with traditional devices and processes such as pouring slurry walls, all the poured cement slurry can be left in the drill hole, without material waste; especially for large-flow seepage water, it can greatly reduce material waste and significantly reduce costs;

[0080] (3) The drainage and pressure relief function is designed to ensure the effective and stable progress of the entire grouting and plugging process, providing a guarantee for construction safety;

[0081] (4) It is highly targeted and widely applicable. It is not only suitable for underground high-pressure, large-flow leakage repair projects in water conservancy and hydropower, municipal utilities, housing construction, and urban roads, but also suitable for reinforcement projects of other soft soil foundations or broken surrounding rocks. It has great economic significance and prospects for large-scale promotion in replacing slurry walls.

[0082] In addition, those skilled in the art should understand that, although there are many problems in the prior art, each embodiment or technical solution of the present invention may be improved in only one or several aspects, without having to simultaneously solve all the technical problems listed in the prior art or background art. Those skilled in the art should understand that any content not mentioned in a claim should not be construed as limiting the claim.

[0083] Although the terms such as shallow grouting pipe, deep grouting pipe, inter-pipe partition, first grouting section, second grouting section, partition, grouting hole, grouting hole, grouting inlet, water-permeable hole, water filter membrane bag, water outlet, expandable anchor, inter-pipe water filter membrane bag, casing, grouting branch pipe, guide shell, orifice seal, inter-pipe space, outer pipe space, borehole to be plugged, etc. are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for the purpose of more conveniently describing and explaining the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention; the terms "first", "second", etc. (if any) in the description and claims of the embodiments of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dual-system progressive grouting and plugging device, characterized by: It comprises a shallow grouting pipe and a deep grouting pipe sleeved in the shallow grouting pipe, wherein an inter-pipe space is formed between the shallow grouting pipe and the deep grouting pipe; and further comprises an inter-pipe partition component arranged in the inter-pipe space; The inter-pipe partition component divides the socketed shallow grouting pipe and deep grouting pipe into a first grouting section, a partition section, and a second grouting section along the length direction; the inter-pipe partition component is arranged at the partition section and is used to seal and separate the inter-pipe space located in the first grouting section from the inter-pipe space located in the second grouting section; A grouting hole and a plurality of slurry outlet holes are opened on the wall of the shallow grouting pipe located in the first grouting section, and the slurry outlet holes are arranged between the grouting hole and the inter-pipe partition component; A plurality of grouting holes are opened on the wall of the shallow grouting pipe located in the second grouting section; A plurality of water-permeable holes are opened on the wall of the deep grouting pipe located in the second grouting section and the separation section; The outer side of the pipe wall of the deep grouting pipe located in the second grouting section and the separation section is sleeved with a water filter membrane bag; The deep grouting pipe located in the first grouting section is provided with a water outlet.

2. The dual-system progressive grouting and plugging device according to claim 1, characterized in that: The inter-tube partition components include expansion anchors and inter-tube water filter membrane bags; The inter-tube filter membrane bag is sleeved on the outer side of the wall of the deep grouting pipe located in the separation section, and the inter-tube filter membrane bag is used to inject cement slurry and fill the inter-tube space of the separation section; The expansion anchor is arranged in the inter-tube space near the first grouting section to block cement slurry from entering the inter-tube space of the separation section.

3. The dual-system progressive grouting and plugging device according to claim 1, characterized in that: A grouting branch pipe is welded on the grouting hole.

4. The dual-system progressive grouting and plugging device according to claim 1, characterized in that: The bottom of the shallow grouting pipe located in the second grouting section is set as a guide shell. The shallow grouting pipe is connected to the outside through the guide shell. The guide shell extends outward from the bottom of the pipe and is truncated into a cone shape.

5. The dual-system progressive grouting and plugging device according to claim 1, characterized in that: It also includes a hole seal, which is arranged on the outside of the shallow grouting pipe located at the first grouting section to seal the borehole to be plugged.

6. The dual-system progressive grouting and plugging device according to claim 1, characterized in that: The shallow grouting pipe is a four-point steel pipe, and the deep grouting pipe is a six-point steel pipe.

7. A dual-system progressive grouting and plugging method, characterized by: The dual-system progressive grouting and plugging device according to any one of claims 1 to 6 comprises the following steps: Use a drilling rig to perform positioning drilling to form a borehole to be plugged; Fixing the assembled dual-system progressive grouting and plugging device in the borehole to be plugged, so that an outer pipe space is formed between the dual-system progressive grouting and plugging device and the borehole to be plugged, and sealing the outer pipe space with a hole seal; Cement slurry is injected into the grouting holes of the dual-system progressive grouting and plugging device until the cement slurry fills the space outside the pipe and at least part of the space between the pipes in the first grouting section and the second grouting section, and then the grouting is stopped; wherein, water is discharged from the water-permeable holes of the deep grouting pipe and the pressure is relieved by the action of the water filter membrane bag; after the cement slurry solidifies, the grouting and plugging of the shallow system is completed; The bottom of the deep grouting pipe of the dual-system progressive grouting and plugging device is opened, and cement slurry is injected into the deep grouting pipe until the cement slurry completely fills the deep grouting pipe and the space between the pipes, and then the grouting is stopped; after the cement slurry solidifies, the grouting and plugging of the deep system is completed.

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