Targeted bag type grouting method and system for tunnel deformation regulation and tunnel reinforcing structure

Abstract

The invention relates to a targeted bag type grouting method and system for tunnel deformation regulation and a tunnel reinforcing structure. The method comprises the following steps: acquiring a deformation position and a deformation amount of a to-be-regulated tunnel; the mounting position of the grouting bag in the stratum is determined according to the deformation position and the deformation amount; grouting holes are constructed according to the deformation positions and the deformation amount, and grouting bags are installed in the grouting holes; and grout is injected into the grouting bag so that the grouting bag can be expanded, and reinforcing and lifting of the to-be-repaired tunnel are achieved through the lifting face of the grouting bag. According to the method, the grouting holes are determined according to the deformation position and the deformation amount, the grouting bags are arranged in the grouting holes, the grouting bags are filled with the grout to achieve reinforcement and lifting of the tunnel, the flowing path, the flowing range, the grouting amount and the penetration depth of the grout can be accurately controlled, the grout is controlled to achieve targeted flowing, and reinforcement and lifting are conducted on the tunnel accurately and directionally.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel deformation regulation, and in particular to a targeted capsule grouting method and system for tunnel deformation regulation and a tunnel reinforcement structure. Background Art

[0002] After the subway shield tunnel is built and operated for a period of time, due to the differences in the strata and the disturbances during operation, many shield tunnels will experience uneven settlement or elliptical deformation, which affects the safety of subway operation. At present, deformation control is often carried out by adding steel rings in the tunnel and micro-disturbance grouting inside and outside the tunnel. Steel ring reinforcement has the disadvantages of high cost, difficult construction, and reduced tunnel contour space. Micro-disturbance grouting inside and outside the tunnel is more and more widely used. Influenced by many factors such as high pressure water conditions and limitations of equipment and facilities in the tunnel, many shield tunnels can only adopt the method of surface micro-disturbance grouting outside the tunnel. Generally, surface micro-disturbance grouting is the process of injecting materials such as cement and mortar into the stratum structure below the tunnel to enhance the strength and stability of the stratum, play a role in lifting and controlling settlement and inhibiting elliptical deformation. However, in the traditional grouting method, the slurry flows randomly, and it is difficult to control its distribution, penetration depth and slurry volume. The degree of refinement is low, which not only affects the grouting effect, but also may lead to waste of resources and increase in costs. In addition, if the subway tunnel is deep and the groundwater reserves are large, it is easy to affect the water-cement ratio of the injected slurry, and the slurry solidification position is also easily affected by the groundwater flow direction, resulting in differences between the grouting position and the lifting and settlement control position, making it impossible to target the tunnel disease position. Therefore, a targeted capsule grouting method, system and tunnel reinforcement structure for tunnel deformation treatment are urgently needed to solve the above problems. Summary of the invention

[0003] In order to solve the above problems, on the one hand, the present invention provides a targeted capsule grouting method for tunnel deformation treatment, comprising the following steps:

[0004] Obtain the deformation position and deformation amount of the tunnel to be rectified;

[0005] Determine the installation position of the grouting bag in the formation according to the deformation position and deformation amount;

[0006] Construct grouting holes according to the deformation position and deformation amount, and install grouting bags in the grouting holes;

[0007] Slurry is injected into the grouting bag to expand the grouting bag, and the reinforcement and lifting of the tunnel to be repaired is achieved through the lifting surface of the grouting bag.

[0008] Furthermore, the method of injecting slurry into the grouting bag to expand the grouting bag and achieving reinforcement and lifting of the tunnel to be rectified through the lifting surface of the grouting bag includes:

[0009] Injecting slurry into the grouting bag, the slurry fills the grouting bag so that the side of the grouting bag facing the tunnel segment presents a lifting surface adapted to the curvature of the tunnel segment, the lifting surface is adjacent to the tunnel segment, and the tunnel segment is lifted by the lifting surface;

[0010] After the grouting bag is filled with slurry, grouting is continued. The slurry opens the overflow holes blocked on the grouting bag and diffuses into the stratum to reinforce the stratum and regulate the lifting and settlement values ​​of the tunnel segments.

[0011] Further, the injecting slurry into the grouting bag specifically includes:

[0012] During the grouting process, the grouting pressure is monitored, and before the grouting bag is filled, the grouting pressure is less than the pressure setting value;

[0013] After the grouting bag is filled with slurry, the grouting pressure is increased to a value greater than the pressure setting value, so that the slurry can flush the blocked overflow hole, and the grouting flow rate and grouting time are adjusted according to the monitored grouting pressure.

[0014] Furthermore, the overflow hole is opened on a side of the grouting bag away from the tunnel segment.

[0015] Furthermore, the step of installing the grouting bag in the grouting hole specifically includes:

[0016] According to the obtained deformation position and deformation amount, determine the length of the grouting section of the grouting pipe, the diameter and number of the grouting holes on the grouting section, and determine the size and shape of the grouting bag and its installation position in the grouting section of the grouting pipe;

[0017] The grouting bag is installed on the grouting section of the grouting pipe;

[0018] Insert the grouting pipe equipped with the grouting bag into the grouting hole until the grouting bag is delivered to the set position.

[0019] Furthermore, constructing grouting holes according to the deformation position and deformation amount specifically includes:

[0020] A group of grouting holes are respectively provided on the left and right sides of the shield tunnel to be renovated, and a grouting bag is provided in each grouting hole. Slurry is injected into the grouting bags on the left and right sides of the shield tunnel to be renovated at the same time to ensure left and right balance during the lifting process of the shield tunnel to be renovated.

[0021] Furthermore, the method further comprises:

[0022] Stop grouting after the slurry solidifies;

[0023] The grouting hole is sealed.

[0024] On the other hand, the present invention also provides a targeted capsule grouting system for tunnel deformation treatment, comprising:

[0025] A data analysis unit, used to obtain the deformation position and deformation amount of the shield tunnel to be rectified;

[0026] A drilling unit, used for determining a drilling position according to a deformation position and deformation amount, and constructing a grouting hole at the drilling position;

[0027] The grouting unit comprises a grouting bag and a grouting device for injecting slurry into the grouting bag. The grouting bag is installed in a grouting hole, and a grouting end of the grouting device is connected to the grouting bag.

[0028] Furthermore, a plurality of overflow holes are provided on the grouting bag, and the overflow holes are located on a side of the grouting bag away from the tunnel segment.

[0029] On the other hand, the present invention also provides a tunnel reinforcement structure, comprising:

[0030] Grouting holes;

[0031] A grouting bag, wherein the grouting bag is arranged in the grouting hole;

[0032] A grouting pipe extends into the grouting hole, the grouting bag is connected with the grouting section of the grouting pipe, the grouting bag is filled with slurry, and a lifting surface is provided on one side of the grouting bag facing the tunnel segment.

[0033] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0034] 1) The targeted capsule grouting method provided by the present invention determines the grouting hole according to the deformation position and deformation amount, and arranges the grouting capsule in the grouting hole. The grouting capsule is filled with slurry to realize tunnel reinforcement and lifting. The flow path, flow range, grouting amount and penetration depth of the slurry can be accurately controlled, and the slurry is controlled to realize targeted flow, and the tunnel is reinforced and lifted in a precise and directional manner.

[0035] 2) The targeted bladder grouting method provided by the present invention adopts grouting with a grouting bladder, which can isolate the high pressure and water-rich environment of the formation, prevent groundwater, silt sand, etc. from flowing back into the grouting pipe from the grouting hole due to the pressure difference during the pipe lowering process, and does not affect the grouting pressure of the grouting hole, thereby improving the grouting effect.

[0036] 3) The targeted capsule grouting method provided by the present invention is not limited by formation conditions and can be flexibly adjusted according to the direction of grouting reinforcement required, so that the slurry can be directionally spread to the specified position.

[0037] 4) The targeted capsule grouting method provided by the present invention performs pressure monitoring during the grouting process, can clearly understand the grouting situation of the formation, realize intelligent control of the grouting process, and achieve a micro-disturbance grouting effect.

[0038] 5) The targeted capsule grouting method provided by the present invention performs grouting on the left and right sides of the tunnel simultaneously, achieving a balance between the convergence and lifting values ​​of the tunnel during the grouting process, ensuring the deformation coordination of the tunnel segments, and accurately controlling the sinking and ellipse of the tunnel in a "hand-held" manner.

[0039] 6) The targeted bladder grouting method provided by the present invention continues grouting after the grouting bladder is filled with slurry. The slurry breaks through the overflow holes blocked on the grouting bladder and diffuses into the stratum, realizing intelligent staged grouting. While lifting and reinforcing the tunnel, the lifting value can be fine-tuned, and the entire grouting process can be precisely targeted and controlled, reducing the consumption of slurry, maximizing the efficiency of slurry, and achieving cost reduction and efficiency improvement in tunnel reinforcement, lifting, and settlement control. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 A flow chart of the targeted capsule grouting method provided by the present invention;

[0042] Figure 2 A schematic diagram of the structure of the targeted capsule grouting system provided by the present invention;

[0043] Figure 3 Schematic diagram of a grouting pipe and a grouting bag in the targeted bladder grouting system provided by the present invention Figure 1 ;

[0044] Figure 4 Schematic diagram of a grouting pipe and a grouting bag in the targeted bladder grouting system provided by the present invention Figure 2 .

[0045] 1- grouting pipe; 11- grouting hole; 12- hole direction mark; 13- waterproof tape; 2- grouting bag; 21- overflow hole; 3- grouting core pipe; 31- grouting pressure gauge; 4- tunnel segment; 5- casing material. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in 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. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In the drawings, the size and relative size of some parts may be enlarged for clarity.

[0047] In the description of the present invention, unless otherwise clearly stipulated and limited, the terms "connection" and "connected" should be interpreted in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the description of the present invention, terms such as "up", "down", "left", "right", "front", "back", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0049] In addition, in the description of the present invention, the terms "first" and "second" are only used to distinguish in the description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0050] Example 1

[0051] As the instruction manual Figure 1 As shown, the invention provides a targeted capsule grouting method for tunnel deformation treatment, comprising the following steps:

[0052] S100: Obtaining the deformation position and deformation amount of the tunnel to be rectified;

[0053] S200: determining the installation position of the grouting bag in the stratum according to the deformation position and deformation amount;

[0054] S300: construct grouting holes according to the deformation position and deformation amount, and install grouting bags in the grouting holes;

[0055] S400: injecting slurry into the grouting bag to expand the grouting bag, and achieving reinforcement and lifting of the tunnel to be repaired through the lifting surface of the grouting bag.

[0056] Specifically, the traditional surface micro-disturbance grouting technology usually adopts high-pressure grouting. Although it can quickly complete the grouting operation, it cannot accurately control the slurry flow direction, slurry injection volume, and lifting reinforcement position. The subway shield tunnel has stricter deformation control standards. Due to the randomness of slurry diffusion, the deformation at the grouting position is often not the maximum deformation, and the lifting value of the defect position cannot be accurately controlled locally. It will also have a greater impact on the tunnel segments outside the grouting hole range, which is easy to cause the subsequent grouting lifting to exceed the limit. At the same time, the adjustment accuracy and stability of the traditional grouting device are low, and it is difficult to meet the high-precision and high-efficiency grouting requirements of shield tunnel control and lifting. In this embodiment, the phase position and deformation of the tunnel to be rectified are first obtained, and then the grouting hole position and the position of the grouting bag in the grouting hole are determined, and real-time monitoring is performed during the grouting process. The flow path, flow range, grouting amount and penetration depth of the slurry can be accurately controlled, and the slurry can be controlled to achieve targeted flow, and the tunnel can be reinforced and lifted accurately and directionally.

[0057] In one embodiment, the method of obtaining the deformation position and deformation amount of the tunnel to be renovated specifically includes: using detection means such as three-dimensional laser scanning, settlement deformation monitoring and track inspection trolleys to accurately determine the deformation position and deformation amount of the shield tunnel, the deformation position includes the range, point and direction of deformation, and further determining the grouting area of ​​the tunnel to be renovated, analyzing the grouting area, and preliminarily calculating the amount of slurry, diffusion range and expansion area, so as to perform accurate and controllable grouting on the tunnel to be renovated.

[0058] In an optimized implementation mode, the grouting bag is injected with slurry to expand the grouting bag, and the reinforcement and lifting of the tunnel to be rectified is realized through the lifting surface of the grouting bag, including:

[0059] S401: injecting slurry into the grouting bag, the slurry filling the grouting bag so that the side of the grouting bag facing the tunnel segment presents a lifting surface adapted to the curvature of the tunnel segment, the lifting surface is adjacent to the tunnel segment and is an arc-shaped surface, and the tunnel segment is lifted by the lifting surface;

[0060] S402: After the grouting bag is filled with slurry, grouting is continued. The slurry opens the overflow holes blocked on the grouting bag and diffuses into the stratum to reinforce the stratum and adjust the lifting and settlement values ​​of the tunnel segments.

[0061] Specifically, the grouting bag is preferably a flexible grouting bag, which expands after being filled with slurry. Figure 2As shown, the grouting bag is a "spoon-shaped" grouting bag after being fully expanded, which includes a square chamber and an arc-shaped surface arranged on the square chamber, the arc-shaped surface is recessed in the chamber, the radius of curvature of the arc-shaped surface is the same as the radius of curvature of the tunnel segment, and the arc-shaped surface is arranged toward one side of the tunnel segment, and the grouting bag is an integrated grouting bag. As the amount of slurry in the grouting bag increases, the "spoon-shaped" grouting bag expands during grouting so as to be uniformly stressed along the curve of the shield tunnel, achieving "hand-held" targeted reinforcement and lifting, and achieving a balance between the convergence value and the lifting value of the tunnel. An overflow hole is provided on the side of the grouting bag away from the arc-shaped surface. The aperture and number of the overflow holes provided on the grouting bag are determined according to the grouting amount, and the aperture of the overflow hole is smaller than the aperture of the pipe for grouting into the grouting bag. Before grouting, the overflow hole is sealed with waterproof sealant. When the grouting bag expands to its maximum, continue to inject slurry into the grouting bag. The slurry flushes the overflow hole and diffuses into the stratum below the tunnel, reinforcing the stratum while providing reverse thrust to fine-tune the lifting and settlement control values ​​of the shield tunnel.

[0062] Preferably, in order to realize grouting in stages, the grouting pressure is monitored in real time during the grouting process, and the grouting pressure setting value is the maximum pressure threshold that the waterproof sealant on the overflow hole can withstand. If the grouting pressure is less than the pressure setting value, the waterproof sealant seals the overflow hole, and when the slurry is injected into the grouting bag, the slurry fills the grouting bag; after the grouting bag is filled with slurry, the grouting continues. Due to the small aperture and limited number of overflow holes, the grouting pressure will gradually increase during the grouting process, and the grouting pressure can be obtained through the grouting pressure gauge on the grouting core tube. When the grouting pressure increases to a value greater than the pressure setting value, the slurry flushes the waterproof sealant, overflows from the overflow hole and diffuses into the stratum below the tunnel, reinforces the stratum, and provides reverse thrust to fine-tune the lifting and sinking control value of the shield tunnel. In the later grouting process, the grouting flow and grouting time can be intelligently controlled according to the reading of the grouting pressure gauge to ensure the micro-disturbance effect on the shield tunnel during the entire grouting process.

[0063] In an optimized implementation mode, the step of installing the grouting bag at a set position in the grouting hole specifically includes:

[0064] According to the obtained deformation position and deformation amount, determine the length of the grouting section of the grouting pipe, the diameter and number of the grouting holes on the grouting section, and determine the size and shape of the grouting bag and its installation position in the grouting section of the grouting pipe;

[0065] The grouting bag is installed on the grouting section of the grouting pipe;

[0066] Insert the grouting pipe equipped with the grouting bag into the grouting hole until the grouting bag is delivered to the set position.

[0067] Specifically, according to the obtained deformation position and deformation amount, the grouting area can be determined, and then the length of the non-grouting section and the grouting section of the grouting pipe can be determined. The shape, size and installation position of the grouting bag on the grouting pipe can also be determined. A number of slurry outlet holes are opened on the grouting section. The aperture and number of the slurry outlet holes can also be determined according to the deformation position and deformation amount. The grouting bag is tied to the grouting section of the grouting pipe with a cable tie, and the slurry outlet hole is connected with the inner cavity of the grouting bag. The grouting bag is sent to the grouting area of ​​the grouting hole through the grouting pipe; the slurry enters the grouting bag through the slurry outlet hole of the grouting pipe. The grouting bag can control the flow path, reaction range and injection amount of the slurry. At the same time, as the slurry in the grouting bag increases, the grouting bag gradually expands to evenly bear the force along the curve of the shield tunnel, and the tunnel is lifted in a "hand-held" targeted manner.

[0068] Preferably, according to the acquired deformation position and deformation amount, an overflow hole is opened on the grouting bag, and the aperture of the overflow hole is smaller than the aperture of the outlet hole. After the grouting bag expands to the maximum, grouting continues, and the slurry flushes the blocked overflow hole. The slurry is injected into the stratum below the tunnel to achieve uniform micro-disturbance lifting of the tunnel. In this embodiment, the outlet hole is arranged toward the arc surface of the grouting bag, and an overflow hole sealed with waterproof glue is opened in the grouting bag in the opposite direction of the outlet hole of the grouting pipe.

[0069] An optimized implementation method is that the slurry holes are arranged in sequence along the axial direction of the grouting pipe, and in order to ensure that the grouting bag expands in a spoon shape, the aperture of the slurry holes at both ends is larger than the aperture of the slurry holes located in the middle section. During the grouting process, the slurry flow rate at both ends of the grouting section is greater than the slurry flow rate in the middle part, which can ensure that the two ends of the grouting bag fit the tunnel first.

[0070] An optimized implementation method is adopted. To ensure uniform force on the left and right sides of the shield tunnel during lifting, a group of grouting holes are respectively provided on the left and right sides of the tunnel to be renovated. A grouting bag is provided in each grouting hole. During grouting, slurry is injected into the grouting bags on the left and right sides of the tunnel at the same time to ensure left-right balance during the lifting of the shield tunnel to be renovated, avoid misalignment and separation of the left and right segments, and ensure the integrity of the tunnel.

[0071] In an optimized implementation mode, the method further includes: stopping grouting after the slurry injected into the formation solidifies; and plugging the grouting pipe and the gap between the grouting pipe and the grouting hole. After the grouting operation is completed, the grouting pipe that exceeds the ground layer is cut off, and then the grouting pipe is plugged with concrete and painted with waterproof coating.

[0072] In this embodiment, by precisely controlling the flow path, diffusion range, grouting volume and penetration depth of the slurry, directional, positioned, quantitative, controllable and staged intelligent targeted control of the shield tunnel sinking control reinforcement grouting process is achieved; full control of the grouting process is achieved, and the grouting flow rate and grouting pressure can be intelligently adjusted based on the feedback of the pressure gauge readings on the grouting situation of the formation; the balance between tunnel lifting and convergence can be achieved, and sinking and elliptical treatment can be adopted simultaneously, grouting materials can be used accurately, engineering costs can be reduced, and cost reduction and efficiency improvement can be achieved.

[0073] Example 2

[0074] The present invention also provides a targeted capsule grouting system for tunnel deformation treatment, which is used to implement the grouting method in Example 1. The system comprises:

[0075] A data analysis unit, used to obtain the deformation position and deformation amount of the shield tunnel to be rectified;

[0076] A drilling unit, used for determining a drilling position according to a deformation position and deformation amount, and constructing a grouting hole at the drilling position;

[0077] The grouting unit comprises a grouting bag 2 and a grouting device for injecting slurry into the grouting bag 2. The grouting bag 2 is installed in a grouting hole. The grouting end of the grouting device is connected to the grouting bag 2 for injecting slurry into the grouting bag 2.

[0078] In an optimized implementation mode, the grouting unit further comprises a grouting pipe 1, which is a sleeve valve pipe made of a PVC pipe and can be assembled by a number of unit pipes. Grouting pipes 1 of different lengths can be assembled as needed; the assembly points between the unit pipes are assembled using a sealing waterproof tape 13. The grouting pipe 1 comprises a grouting section and a non-grouting section, wherein the grouting section is located below the non-grouting section, and the grouting bag 2 is installed on the grouting section of the grouting pipe 1. After the grouting pipe 1 is inserted into the grouting hole, the grouting section is located in the grouting area. The inner cavity of the grouting pipe 1 is connected to the grouting bag 2, and the grouting core pipe 3 of the grouting device extends into the grouting pipe 1 for injecting slurry.

[0079] Preferably, a plurality of slurry outlet holes 11 are provided on the grouting section along the axial direction of the grouting pipe 1, the apertures of the slurry outlet holes 11 at both ends are larger than the aperture of the middle slurry outlet hole 11, the slurry outlet holes 11 are connected with the chamber of the grouting bag 2, and the slurry can enter the grouting bag 2 through the slurry outlet holes 11. After the grouting bag 2 is expanded, it becomes a spoon-shaped grouting bag, and its arc surface faces one side of the tunnel segment 4. When the grouting bag 2 is installed on the grouting section, the slurry outlet holes 11 are arranged toward one side of the arc surface, and the slurry outlet holes 11 at both ends correspond to the two ends of the grouting bag 2 respectively.

[0080] Preferably, in order to facilitate marking the orientation of the slurry hole 11, a hole opening direction mark 12 is provided at the upper end of the grouting pipe. The hole opening direction mark 12 is arranged on one side of the slurry hole 11 and is located on the ground. During the lowering process of the grouting pipe 1, the accurate positions of the slurry hole 11 and the grouting bag 2 in the grouting hole can be ensured.

[0081] Preferably, the grouting bag 2 is provided with a plurality of overflow holes 21, and the overflow holes 21 are located on the side of the grouting bag 2 away from the tunnel segment 4. The grouting hole 11 and the overflow hole 21 are respectively located on both sides of the axis of the grouting pipe 1, and the aperture of the overflow hole 21 is smaller than the aperture of the grouting hole 11.

[0082] Preferably, a grouting pressure gauge 4 is provided on the grouting core tube for monitoring the grouting pressure, and the grouting flow rate, grouting pressure and grouting time can be adjusted according to the pressure monitoring value.

[0083] Preferably, after the grouting pipe 1 equipped with the grouting bag 2 is inserted into the grouting hole, the grouting hole is sealed with the casing material 5 to ensure the grouting state.

[0084] Preferably, a group of grouting holes are respectively arranged on the left and right sides of the tunnel, each grouting hole is provided with a grouting pipe 1 and a grouting bag 2, the two groups of grouting holes are symmetrically arranged, and grouting is carried out simultaneously to achieve left-right balance of deformation of the shield tunnel during the grouting process, to ensure that the tunnel is always in a state of uniform left-right stress during the grouting process, to avoid the phenomenon of misalignment and separation of the left and right block segments, and to ensure the integrity of the tunnel.

[0085] Example 3

[0086] The present invention also provides a tunnel reinforcement structure, comprising:

[0087] Grouting holes;

[0088] A grouting bag, wherein the grouting bag is arranged in the grouting hole;

[0089] A grouting pipe extends into the grouting hole, the grouting bag is connected with the grouting section of the grouting pipe, the grouting bag is filled with slurry, and a lifting surface is provided on one side of the grouting bag facing the tunnel segment.

[0090] The effect of the targeted capsule grouting method provided by the present invention is described below through specific implementation methods.

[0091] According to the buried depth, position and deformation of the shield tunnel, determine the grouting area, the length of the grouting section of the grouting pipe, the size of the grouting bag and its installation position on the grouting pipe. First, use the drilling rig to symmetrically tilt the hole to the predetermined depth of the tunnel (about 45m). The tilt angle can be calculated and adjusted according to the actual situation of the tunnel on site. Then, the sleeve valve pipe with a spoon-shaped grouting bag and differential holes installed is lowered into the grouting hole. The sleeve valve pipe is assembled from multiple 6m long PVC pipes. The grouting section of the sleeve valve pipe is processed on the surface. A row of grouting holes 11 with different apertures are opened vertically in the grouting section, and the hole opening direction mark 12 is made at the mouth of the sleeve valve pipe according to the position of the grouting hole 11. As shown in the attached manual Figure 3 As shown, there are four slurry outlet holes 11, and the opening direction is consistent. The diameter of the first and last two slurry outlet holes is 8mm, and the diameter of the two middle slurry outlet holes is 5mm. According to the opening direction of the slurry outlet holes, an opening direction mark 12 is set at the sleeve valve pipe mouth. The grouting bag 2 designed according to the tunnel size is tied according to the position of the slurry outlet hole. The size of the grouting bag 2 is calculated according to the circular size of the tunnel to ensure that the "spoon-shaped" structure of the grouting bag after filling can fit the tunnel for "hand-held" lifting and settlement control and elliptical change treatment. As shown in the attached manual Figure 4 As shown, the overflow holes 21 on the grouting bag 2 are arranged in the opposite direction of the slurry discharge hole. The diameter of the overflow holes is 2 mm. The overflow holes 21 are distributed in an array, with 5 overflow holes arranged horizontally and 4 overflow holes arranged vertically, to ensure that the slurry can be sprayed and diffused into the formation after the grouting bag is filled, forming a stone body and providing a reaction force to lift and reinforce the formation in a targeted manner.

[0092] After the sleeve valve pipe is lowered, the casing material 5 is poured around the pipe, and the grouting hole is sealed with the casing material 5 to ensure the state of the grouting hole. When the strength of the casing material 5 meets the requirements, the grouting core pipe 3 with the grouting stopper can be lowered for grouting construction. The grouting core pipe 3 is connected to a grouting pressure gauge 31, which can monitor the grouting pressure in real time, and can adjust the grouting flow, grouting pressure and grouting time according to the monitored pressure.

[0093] Those skilled in the art will appreciate that the present invention can be implemented in many other specific forms without departing from the spirit and scope of the present invention. Although embodiments of the present invention have been described, it should be understood that the present invention should not be limited to this embodiment, and those skilled in the art can make changes and modifications within the spirit and scope of the present invention as defined by the appended claims.

Claims

1. A targeted capsule grouting method for tunnel deformation treatment, characterized in that: The following steps are involved: Obtain the deformation position and deformation amount of the tunnel to be rectified; Determine the installation position of the grouting bag in the formation according to the deformation position and deformation amount; Construct grouting holes according to the deformation position and deformation amount, and install grouting bags in the grouting holes; Slurry is injected into the grouting bag to expand the grouting bag, and the reinforcement and lifting of the tunnel to be repaired is achieved through the lifting surface of the grouting bag.

2. The targeted capsule grouting method for tunnel deformation treatment according to claim 1 is characterized in that: The method of injecting slurry into the grouting bag to expand the grouting bag and achieving reinforcement and lifting of the tunnel to be repaired through the lifting surface of the grouting bag includes: Injecting slurry into the grouting bag, the slurry fills the grouting bag so that the side of the grouting bag facing the tunnel segment presents a lifting surface adapted to the curvature of the tunnel segment, the lifting surface is adjacent to the tunnel segment, and the tunnel segment is lifted by the lifting surface; After the grouting bag is filled with slurry, grouting is continued. The slurry opens the overflow holes blocked on the grouting bag and diffuses into the stratum to reinforce the stratum and regulate the lifting and settlement values ​​of the tunnel segments.

3. The targeted capsule grouting method for tunnel deformation treatment according to claim 2 is characterized in that: The injecting slurry into the grouting bag specifically comprises: During the grouting process, the grouting pressure is monitored, and before the grouting bag is filled, the grouting pressure is less than the pressure setting value; After the grouting bag is filled with slurry, the grouting pressure is increased to a value greater than the pressure setting value, so that the slurry can flush the blocked overflow hole, and the grouting flow rate and grouting time are adjusted according to the monitored grouting pressure.

4. The targeted capsule grouting method for tunnel deformation treatment according to claim 2 is characterized in that: The overflow hole is opened on a side of the grouting bag away from the tunnel segment.

5. The targeted capsule grouting method for tunnel deformation treatment according to claim 1, characterized in that: The step of installing the grouting bag in the grouting hole specifically comprises: According to the obtained deformation position and deformation amount, determine the length of the grouting section of the grouting pipe, the diameter and number of the grouting holes on the grouting section, and determine the size and shape of the grouting bag and its installation position in the grouting section of the grouting pipe; Installing the grouting bag on the grouting section of the grouting pipe; Insert the grouting pipe equipped with the grouting bag into the grouting hole until the grouting bag is delivered to the set position.

6. The targeted capsule grouting method for tunnel deformation treatment according to claim 1, characterized in that: The construction of grouting holes according to the deformation position and deformation amount specifically includes: A group of grouting holes are respectively provided on the left and right sides of the shield tunnel to be renovated, and a grouting bag is provided in each grouting hole. Slurry is injected into the grouting bags on the left and right sides of the shield tunnel to be renovated at the same time to ensure left and right balance during the lifting process of the shield tunnel to be renovated.

7. The targeted capsule grouting method for tunnel deformation treatment according to claim 1, characterized in that: The method further comprises: Stop grouting after the slurry solidifies; The grouting hole is sealed.

8. A targeted capsule grouting system for tunnel deformation treatment, characterized in that: include: A data analysis unit, used to obtain the deformation position and deformation amount of the shield tunnel to be rectified; A drilling unit, used for determining a drilling position according to a deformation position and deformation amount, and constructing a grouting hole at the drilling position; The grouting unit comprises a grouting bag and a grouting device for injecting slurry into the grouting bag. The grouting bag is installed in a grouting hole, and a grouting end of the grouting device is connected to the grouting bag.

9. The targeted capsule grouting system for tunnel deformation treatment according to claim 8, characterized in that: The grouting bag is provided with a plurality of overflow holes, and the overflow holes are located on a side of the grouting bag away from the tunnel segment.

10. A tunnel reinforcement structure, characterized in that: include: Grouting holes; A grouting bag, wherein the grouting bag is arranged in the grouting hole; A grouting pipe extends into the grouting hole, the grouting bag is connected with the grouting section of the grouting pipe, the grouting bag is filled with slurry, and a lifting surface is provided on one side of the grouting bag facing the tunnel segment.

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