High polymer grouting method and system for tunnel deformation improvement

Abstract

The invention relates to a high polymer grouting method and system for tunnel deformation improvement. The method comprises the following steps: acquiring a deformation position and a deformation amount of a to-be-regulated tunnel; the drilling position is determined according to the deformation position and the deformation amount, and a hole is drilled to the position below the tunnel segment to form a grouting hole; the grouting bag is inserted into the grouting hole through the grouting pipe and sent to a set position; and a high polymer grouting material is injected into the grouting pipe, the grouting bag is filled with the high polymer grouting material, the high polymer grouting material overflows out of the grouting pipe and is diffused into the stratum below the to-be-treated tunnel for permeation reinforcement, and shield tunnel deformation treatment is achieved. The grouting bag is arranged on the grouting pipe, after a high polymer grouting material is injected, the grouting bag is filled with the high polymer grouting material, the high polymer grouting material is injected into the stratum, it can be guaranteed that the high polymer grouting material is not affected by underground water of the stratum when subjected to polymerization reaction, full reaction can be achieved, the high polymer grouting material is injected into a target position, and the utilization rate of the grouting material is increased; the grouting effect is ensured, and the effects of reducing cost and increasing efficiency are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of shield tunnel deformation treatment, and in particular to a polymer grouting method and system for tunnel deformation treatment. Background Art

[0002] After a period of operation, due to the influence of groundwater erosion, geological conditions, aging of shield segments and other factors, the shield tunnel will experience uneven settlement or elliptical deformation, which will affect the safety of subway operation. At present, the main treatment method for uneven settlement and elliptical deformation of shield tunnels is grouting reinforcement. With the continuous development and progress of polymer materials, polymer grouting has gradually become a new method for subway tunnel disease treatment. Polymer grouting reinforces the injected stratum by mixing two polymer liquid materials to undergo polymerization reaction and expand to form a foam-like polymer solid. Among them, polymer grouting materials have the advantages of short hardening time, high strength, good injectability, and insolubility in water, which can effectively solve the problem of subway tunnel settlement. It can quickly reach the design strength, shorten the construction period, and improve construction efficiency. At the same time, polymer grouting materials have high compressive strength and tensile strength, which can effectively improve the bearing capacity of the injected stratum. In addition, polymer grouting materials have a lower viscosity and can penetrate into the strata where the tunnel is located better than cement-based materials. At the same time, polymer materials can adaptively flow into soft strata according to the size of resistance, thereby compacting and reinforcing the strata around the tunnel.

[0003] However, in the traditional polymer grouting method, due to the complexity of the formation environment, the performance of the polymer material of the polymer grouting may change under unfavorable formation environment conditions, resulting in the inability of the two polymer materials to undergo 100% polymerization reaction in the formation to generate polymers for compacting and reinforcing the formation, resulting in material waste and poor grouting effect. At the same time, if the subway tunnel is deep and the groundwater reserves are large, it is easy to affect the diffusion path and diffusion range of the injected material, resulting in a small amount of polymer generated, and the action position is uncontrollable, resulting in uneven uplift of the tunnel, which will cause secondary hazards and make it impossible to accurately and effectively treat the tunnel disease location. Therefore, a polymer grouting method and system for tunnel deformation treatment is urgently needed to solve the above problems. Summary of the invention

[0004] In order to solve the above problems, on the one hand, the present invention provides a polymer grouting method for tunnel deformation treatment, comprising the following steps:

[0005] Obtain the deformation position and deformation amount of the tunnel to be rectified;

[0006] Determine the drilling position according to the deformation position and deformation amount, and drill a hole below the tunnel segment to form a grouting hole;

[0007] Insert the grouting bag into the grouting hole through the grouting pipe and send it to the set position;

[0008] A polymer grouting material is injected into the grouting pipe, and the polymer grouting material fills the grouting bag and overflows the grouting pipe to diffuse into the stratum below the tunnel to be renovated for penetration reinforcement, so as to realize the deformation renovation of the shield tunnel.

[0009] Furthermore, the grouting bag is inserted into the grouting hole through the grouting pipe and sent to the set position, including:

[0010] According to the obtained grouting area and deformation, determine the length of the grouting section of the grouting pipe, the position and number of the grouting holes on the grouting section, and determine the size of the grouting bag and its installation position in the grouting section of the grouting pipe;

[0011] The grouting bag is installed on the grouting section of the grouting pipe;

[0012] Insert the grouting pipe equipped with the grouting bag into the grouting hole until the grouting bag is delivered to the set position.

[0013] Further, the step of injecting the polymer grouting material into the grouting pipe specifically includes:

[0014] During the grouting process, the pressure in the grouting pipe is monitored, and before the grouting bag is filled, the pressure in the grouting pipe is ensured to be less than the pressure setting value, so that the polymer grouting material fills the grouting bag first;

[0015] After the grouting bag is filled, grouting is continued, and the pressure in the grouting pipe is greater than the pressure setting value, so that the polymer grouting material breaks through the sealing layer on the grouting pipe and is injected into the stratum below the shield tunnel to be rectified.

[0016] Furthermore, the step of injecting the polymer grouting material into the grouting pipe further comprises:

[0017] During the grouting process, the grouting time and the grouting flow rate are adjusted according to the real-time monitoring data of the shield tunnel to be rectified, so that the lifting value of the shield tunnel to be rectified per unit time is within a set range.

[0018] Furthermore, a group of grouting holes are respectively provided on the left and right sides of the shield tunnel to be renovated, and polymer grouting material is simultaneously injected into the grouting pipes in the two groups of grouting holes to balance the left and right sides of the shield tunnel to be renovated.

[0019] Furthermore, the expanded side of the grouting bag is arranged toward the tunnel segment, and the grouting bag is filled with polymer grouting material and then fits with the tunnel segment.

[0020] Furthermore, the method further comprises:

[0021] Stop grouting after the polymer grouting material injected into the formation solidifies;

[0022] Seal the grouting pipe and the gap between the grouting pipe and the grouting hole.

[0023] On the other hand, the present invention also provides a polymer grouting system for shield tunnel deformation treatment, comprising:

[0024] Data analysis unit, used to obtain the grouting area and deformation of the shield tunnel to be rectified;

[0025] A drilling unit is used to determine the drilling position according to the grouting area and deformation amount, and drill a hole under the tunnel segment to form a grouting hole;

[0026] The grouting unit comprises a grouting pipe, a grouting bag and a grouting device for injecting polymer grouting material into the grouting pipe. The grouting pipe is connected to the grouting end of the grouting device, and the grouting bag is connected to the grouting section of the grouting pipe and extends into the grouting hole through the grouting pipe.

[0027] Furthermore, the grouting section is provided with a first grouting hole and a second grouting hole, the grouting bag is connected to the first grouting hole, and a sealing layer is provided on the second grouting hole. After the grouting bag is filled with polymer grouting material, the polymer grouting material breaks through the sealing layer and is injected into the soil layer.

[0028] Furthermore, the number of the first slurry outlet holes is greater than the number of the second slurry outlet holes, and the aperture of the first slurry outlet holes is greater than the aperture of the second slurry outlet holes.

[0029] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0030] 1) The polymer grouting method provided by the present invention comprises a grouting bag on the grouting pipe. After the polymer grouting material is injected, it first undergoes a polymerization reaction and expands in the flexible grouting bag, and the polymer grouting material is continuously injected into the formation, so that the polymer grouting material is not affected by the groundwater in the formation during the polymerization reaction and can fully react, and the polymer grouting material can be injected into the target position, thereby improving the utilization rate of the grouting material, ensuring the grouting effect, and achieving the effect of reducing costs and increasing efficiency.

[0031] 2) The polymer grouting method provided by the present invention can accurately control the flow range, reaction position, diffusion position and penetration depth of the polymer grouting material, control the expansion of the polymer in the flexible grouting bag, avoid local failure affecting the grouting effect, and apply uniform external force to the shield tunnel segment through the grouting bag to achieve the balance between the convergence and lifting values ​​of the shield during the grouting process, thereby ensuring the deformation coordination of the tunnel segment.

[0032] 3) The polymer grouting method provided by the present invention can realize segmented grouting by performing differential hole opening and sealing operations on the grouting pipe, ensuring that the polymer grouting material expands in the grouting bag first, and after the grouting bag is fitted to the shield tunnel, the polymer grouting material flows out of the grouting pipe, and the stratum below the tunnel is filled and reinforced with the polymer grouting material, so that the shield tunnel is uniformly force-applied, the tunnel segments are less disturbed, and the purpose of micro-disturbance lifting can be well achieved. At the same time, the stratum below the tunnel is compacted to ensure the durability of the reinforcement and lifting effect of the shield tunnel.

[0033] 4) The polymer grouting method provided by the present invention performs grouting operations on the left and right sides of the shield tunnel at the same time, ensuring that the tunnel is always in a state of uniform stress on the left and right sides during the grouting process, avoiding the phenomenon of misalignment and separation of the left and right block segments, and ensuring the integrity of the tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] 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.

[0035] Figure 1 A flow chart of the polymer grouting method provided by the present invention;

[0036] Figure 2 A schematic structural diagram of a polymer grouting system provided by the present invention;

[0037] Figure 3 The present invention is a schematic structural diagram of the connection between a grouting bag and a grouting pipe in the polymer grouting system provided by the present invention.

[0038] 1- grouting pipe; 2- grouting bag; 3- binding belt; 4- first grouting hole; 5- grouting core tube; 6- shell material; 7- expanded polymer; 8- second grouting hole. DETAILED DESCRIPTION

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] Example 1

[0044] As the instruction manual Figure 1 As shown, the present invention provides a polymer grouting method for shield tunnel deformation treatment, comprising the following steps:

[0045] S100: Obtaining the deformation position and deformation amount of the tunnel to be rectified;

[0046] S200: Determine a drilling position according to the deformation position and deformation amount, and drill a hole below the tunnel segment to form a grouting hole;

[0047] S300: inserting the grouting bag into the grouting hole through the grouting pipe and sending it to the set position;

[0048] S400: Injecting polymer grouting material into the grouting pipe, the polymer grouting material fills the grouting bag and overflows to the outside of the grouting pipe and diffuses to the stratum below the tunnel to be renovated for penetration reinforcement, so as to achieve deformation renovation of the shield tunnel.

[0049] Specifically, the traditional polymer grouting method usually adopts a double-tube high-pressure grouting method, using two independent grouting pipes to inject two polymer materials into the reinforcement part. Although the grouting operation can be completed quickly, it is affected by the formation environment and cannot accurately control the polymerization reaction position, the dense reinforcement area, and the amount of material injection, which may lead to uneven grouting effect and even local failure. At the same time, since polymer grouting has obvious expansion characteristics, and the subway shield tunnel has strict deformation control standards, it is necessary to ensure that the polymer not only reinforces the formation where the tunnel is located, but also ensures the uniform lifting of the pipe segment. This requires precise control of the amount, diffusion range, expansion area, and expansion effect of the raw materials for polymer grouting, to ensure that the polymer effectively densifies and micro-disturbs the formation at the tunnel disease position, and prevents the polymer from "going off" due to the influence of the formation environment, so as to achieve targeted, quantitative, uniform, and controllable polymer grouting. At the same time, in order to ensure that the polymer material does not have too much impact on the formation environment, the fluidity and diffusivity of the material during the grouting process are controlled to ensure that the polymerization reaction occurs at the remediation location. During the renovation process of this embodiment, by obtaining the grouting area and deformation of the shield tunnel to be renovated, the position of the grouting hole can be determined, and the amount, diffusion range, expansion area, expansion effect, etc. of the polymer grouting material can be clarified. The grouting bag is installed on the grouting pipe and lowered to the set position, that is, the grouting section of the grouting pipe is sent to the grouting area to ensure the accuracy of the grouting operation, so as to realize fast, precise, uniform and controllable grouting reinforcement and lifting of the shield tunnel.

[0050] In one embodiment, the obtaining of the grouting area and deformation of the shield 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 of the shield tunnel, including the range, location and direction of the deformation, and further determining the grouting area of ​​the shield tunnel to be renovated, analyzing the grouting area, and preliminarily calculating the amount of polymer grouting material, diffusion range and expansion area, so as to perform precise and controllable grouting on the shield tunnel to be renovated.

[0051] In an optimized implementation mode, the grouting bag is preferably a flexible grouting bag, and the grouting bag is inserted into the grouting hole through the grouting pipe and sent to the set position, comprising:

[0052] S301: according to the acquired grouting area and deformation amount, determine the length of the grouting section of the grouting pipe, the position and number of the grouting holes on the grouting section, and determine the size of the flexible grouting bag and its installation position in the grouting section of the grouting pipe;

[0053] S302: installing the flexible grouting bag on the grouting section of the grouting pipe;

[0054] S303: inserting the grouting pipe equipped with the flexible grouting bag into the grouting hole until the flexible grouting bag is delivered to the set position.

[0055] Specifically, according to the obtained grouting area and deformation, the length of the grouting section of the grouting pipe can be determined, the flexible grouting bag can be installed in the grouting section of the grouting pipe, and the flexible grouting bag can be sent to the grouting area of ​​the grouting hole through the grouting pipe; the appropriate size of the flexible grouting bag is selected and its installation position on the grouting pipe is determined to ensure that the polymer grouting material expands in the grouting bag to wrap the shield tunnel and uniformly compact and reinforce the surrounding strata. The flexible grouting bag can control the flow path, reaction range and injection amount of the polymerization reaction raw materials. At the same time, as the amount of polymer generated in the grouting bag increases, the flexible grouting bag gradually expands to evenly bear force along the curve of the shield tunnel. Continue grouting, and the polymer grouting material injected into the strata below the tunnel can achieve uniform micro-disturbance lifting of the tunnel. The present invention can accurately control the entire grouting and lifting process, reduce the consumption of polymer reaction materials, maximize the efficiency of polymer grouting materials, ensure uniform reinforcement, lifting and sinking control of the shield tunnel, and achieve cost reduction and efficiency improvement of the shield tunnel polymer grouting project.

[0056] In an optimized implementation method, the polymer grouting material is injected into the grouting pipe, which specifically includes: before grouting, the grouting hole on the grouting pipe located outside the flexible grouting bag is blocked to ensure that the polymer grouting material first undergoes polymerization reaction and expands in the flexible grouting bag. The pressure setting value of the grouting pipe is the maximum pressure threshold that the blocking layer can withstand. When the maximum pressure threshold is exceeded, the blocking layer is broken, and the polymer grouting material in the grouting pipe can overflow through the grouting hole and be injected into the stratum below the tunnel to perform penetration reinforcement, improve its bearing capacity, and slowly lift the shield tunnel. During the grouting process, the pressure in the grouting pipe is monitored, and before the flexible grouting bag is filled, it is ensured that the pressure in the grouting pipe is less than the pressure setting value, so that the polymer grouting material first fills the flexible grouting bag; after the flexible grouting bag is filled, grouting is continued, and the pressure in the grouting pipe is greater than the pressure setting value, so that the polymer grouting material breaks through the blocking layer on the grouting pipe and is injected into the stratum below the shield tunnel to be renovated.

[0057] An optimized implementation method, wherein the injecting of polymer grouting material into the grouting pipe further comprises: during the grouting process, adjusting the grouting time and grouting flow rate according to the real-time monitoring data of the shield tunnel to be renovated, so that the lifting value of the shield tunnel to be renovated per unit time is within a set range. In the remediation of shield tunnel deformation, the greater the height of tunnel lifting, the higher the construction efficiency, but the higher the single lifting height is not necessarily better. During the shield tunnel lifting process, the overall integrity and stress changes of the shield tunnel must also be ensured to avoid uneven stress on the shield tunnel, cracking and other problems. In order to reduce damage to the shield tunnel during the grouting process, the lifting value of the shield tunnel to be renovated per unit time is within a set range, and the tunnel is slowly reinforced and lifted.

[0058] An optimized implementation method is adopted. In order 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 shield tunnel to be renovated. Polymer grouting material is injected into the grouting pipes in the two groups of grouting holes at the same time to balance the left and right sides of the shield tunnel to be renovated and achieve a balance between the tunnel convergence value and the lifting value. At the same time, it can also avoid the phenomenon of misalignment and separation of the left and right segments, thereby ensuring the integrity of the tunnel.

[0059] In this embodiment, after the polymer grouting material is injected into the flexible grouting bag through the grouting pipe, the grouting bag expands, and its expanded side is set toward the tunnel segment. The grouting bag is provided with a lifting surface on the side facing the tunnel segment. The lifting surface is an arc-shaped surface, and its curvature is adapted to the curvature of the tunnel segment. The lifting surface is adjacent to the tunnel segment. After the flexible grouting bag is filled with the polymer grouting material, it fits with the tunnel segment. After the flexible grouting bag is filled, it is crescent-shaped.

[0060] In this embodiment, a polymer grouting material is used. The polymer grouting material is a two-component grouting material, including component A and component B. Component A and component B are mixed in a certain proportion. After the two undergo a polymerization reaction, the volume expands rapidly and forms a foam-like solid, thereby achieving the purpose of reinforcing the stratum and lifting the tunnel. Of course, the polymer grouting material includes but is not limited to a two-component grouting material. For example, the polymer grouting material can be polyurethane, epoxy resin, acrylamide, etc.

[0061] In an optimized implementation mode, the method further comprises: stopping the grouting after the polymer grouting material to be 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.

[0062] In this embodiment, the flow path, diffusion range, diffusion order and penetration depth of the polymer grouting material are accurately controlled by flexible grouting bags and grouting pipes with differential openings, so that the polymer material can be well injected into the target position. At the same time, the performance of the polymer material and the grouting reinforcement effect are not affected by the formation environment, the effect of uniform polymer grouting is achieved, and the construction difficulty and cost are reduced; the balance between tunnel lifting and convergence is achieved, and both sinking and ovalization are controlled. The polymer grouting raw materials are fully utilized, material waste or insufficient polymerization reaction is avoided, the construction quality of the polymer grouting is guaranteed, the project cost is reduced, and the cost reduction and efficiency improvement of the polymer grouting construction are achieved.

[0063] Example 2

[0064] As the instruction manual Figure 2 As shown, the present invention also provides a polymer grouting system for shield tunnel deformation treatment, which is used to implement the polymer grouting method described in Example 1, and the system includes:

[0065] Data analysis unit, used to obtain the grouting area and deformation of the shield tunnel to be rectified;

[0066] A drilling unit is used to determine the drilling position according to the grouting area and deformation amount, and drill a hole under the tunnel segment to form a grouting hole;

[0067] The grouting unit comprises a grouting pipe 1, a grouting bag 2 and a grouting device for injecting polymer grouting material into the grouting pipe 1. The grouting pipe 1 is connected to the grouting end of the grouting device, and the grouting bag 2 is connected to the grouting pipe 1 and extends into the grouting hole through the grouting pipe 1.

[0068] Specifically, the grouting pipe 1 is a sleeve valve pipe, which is made of 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 between the unit pipes is assembled with sealing waterproof tape. The grouting pipe 1 includes a grouting section and a non-grouting section. The grouting section is located below the non-grouting section. After the grouting pipe 1 is inserted into the grouting hole, the grouting section is located in the grouting area. The grouting bag 2 is connected to the grouting section, and the inner cavity of the grouting pipe 1 is connected to the grouting bag 2. Of course, part of the grouting section is located outside the grouting bag 2; the grouting bag is preferably a flexible grouting bag.

[0069] Optimize the implementation method, as shown in the attached manual Figure 3 As shown, the grouting section is provided with a first grouting hole 4 and a second grouting hole 8, and the grouting bag 2 is connected with the first grouting hole 4. Before grouting, a blocking layer is provided on the second grouting hole 8. After the grouting bag 2 is filled with polymer grouting material, the polymer grouting material breaks through the blocking layer and is injected into the soil layer. The grouting bag 2 is fixed to the grouting pipe 1 by a binding belt 3, and the first grouting hole 4 is connected with the grouting bag 2 to ensure that the injected polymer grouting material enters the grouting bag 2 and undergoes polymerization reaction and expansion therein. The grouting bag 2 is crescent-shaped; the second grouting hole 8 is blocked with glass glue. When the pressure in the grouting pipe 1 is too high, the glass glue is destroyed, and the polymer grouting material in the grouting pipe 1 can be injected into the soil layer.

[0070] In an optimized implementation manner, the number of the first slurry outlet holes 4 is greater than the number of the second slurry outlet holes 8 , and the aperture of the first slurry outlet holes 4 is greater than the aperture of the second slurry outlet holes 8 .

[0071] According to an optimized implementation method, the grouting device includes a grouting core tube 5 inserted into the grouting pipe 1. The number of the grouting core tubes 5 is the same as the number of components of the polymer grouting material. In this embodiment, each grouting pipe 1 is configured with two grouting core tubes 5, and the grouting core tubes are connected to a grouting device for providing slurry. A flow regulating valve for controlling the flow of slurry is provided at the front end of the grouting core tube.

[0072] In an optimized implementation method, after the grouting pipe 1 equipped with the grouting bag 2 is inserted into the grouting hole, the grouting hole is sealed with a casing material 6 to ensure the grouting state.

[0073] An optimized implementation method is to set a group of grouting holes on the left and right sides of the shield tunnel respectively. A grouting pipe 1 and a grouting bag 2 are provided in the grouting holes. 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 misalignment and separation of the left and right segments, and to ensure the integrity of the tunnel.

[0074] The effect of the polymer grouting method provided by the present invention is described below through specific implementation methods.

[0075] According to the buried depth, position and deformation of the shield tunnel, the grouting area, the length of the grouting section of the grouting pipe, the size of the flexible grouting bag and its installation position on the grouting pipe are determined. First, the drilling rig is used 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 crescent-shaped flexible grouting bag and differential openings is lowered into the hole. The grouting section of the sleeve valve pipe is processed on the surface. The length of the grouting section is set to 6m. The grouting section is opened with three first grouting holes and one second grouting hole. The interval between adjacent grouting holes is 1.5m; among them, the aperture of the first grouting hole is 20mm, and the aperture of the second grouting hole is 14mm. A crescent-shaped flexible grouting bag is installed at the first grouting hole and fixed to the outer wall of the sleeve valve tube with a binding belt to ensure that after the first grouting hole is slurried, the two polymer grouting components are fully mixed and reacted in the grouting bag to generate expanded polymer 7. The grouting bag can limit the polymer generation area, compact and reinforce the surrounding strata and further lift them. At the same time, due to the difference in the number and diameter of the grouting holes, the expansion speed of the grouting bag is greater than the speed of the second grouting hole to generate polymers in the strata, which can ensure that the grouting bag first fits the shield tunnel segment to make it evenly stressed, and the subsequent process of the polymer injected into the stratum to lift the segment can be smooth and coordinated.

[0076] After the sleeve valve pipe is lowered, two grouting core pipes 5 are installed. The function of the grouting core pipe 5 is to send the two polymer materials of the polymerization reaction to the designated grouting section for reaction. After the lowering of the pipe is completed, the grouting hole is sealed with a shell material 6 to ensure the state of the grouting hole.

[0077] During the grouting process, two polymer grouting components are injected into the position of the tunnel that needs to be deformed through the grouting core tube 5, and the polymer grouting components are injected into the grouting bag 2 through the first grouting hole 4. The grouting bag 2 isolates the complex environment of the stratum to prevent the polymer grouting components from "running away". It can be fully mixed in the grouting bag 2 to undergo polymerization reaction to generate slightly expanded polymers, which gradually fill the grouting bag 2, so that the grouting bag 2 slowly deforms and recovers to a crescent shape to compact and reinforce the left and right strata of the shield tunnel, and at the same time, the pipe segments are fitted to ensure that the external force of the pipe segments is uniform. At the same time, the second grouting hole 8 at the tail needs to wait for the grouting bag to be deformed after completion of the hole pressure increase before it can be discharged. The generated polymer mainly compacts and reinforces the stratum at the bottom of the tunnel and improves the bearing capacity of the stratum. Due to the existence of the grouting bag, the polymer will not "run away" upwards, and the force on the shield tunnel is also relatively uniform. The disturbance to the tunnel segments is small, which can well achieve the purpose of micro-disturbance lifting.

[0078] 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 polymer 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 drilling position according to the deformation position and deformation amount, and drill a hole below the tunnel segment to form a grouting hole; Insert the grouting bag into the grouting hole through the grouting pipe and send it to the set position; A polymer grouting material is injected into the grouting pipe, and the polymer grouting material fills the grouting bag and overflows the grouting pipe to diffuse into the stratum below the tunnel to be renovated for penetration reinforcement, so as to realize the deformation renovation of the shield tunnel.

2. The polymer grouting method according to claim 1, characterized in that: The method of inserting the grouting bag into the grouting hole through the grouting pipe and sending it to the set position includes: According to the obtained grouting area and deformation, determine the length of the grouting section of the grouting pipe, the position and number of the grouting holes on the grouting section, and determine the size of the grouting bag and its installation position in the grouting section of the grouting pipe; The grouting bag is installed 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.

3. The polymer grouting method according to claim 1, characterized in that: The step of injecting the polymer grouting material into the grouting pipe specifically comprises: During the grouting process, the pressure in the grouting pipe is monitored, and before the grouting bag is filled, the pressure in the grouting pipe is ensured to be less than the pressure setting value, so that the polymer grouting material fills the grouting bag first; After the flexible grouting bag is filled, grouting is continued, and the pressure in the grouting pipe is greater than the pressure setting value, so that the polymer grouting material breaks through the sealing layer on the grouting pipe and is injected into the stratum below the shield tunnel to be renovated.

4. The polymer grouting method according to claim 1, characterized in that: The step of injecting the polymer grouting material into the grouting pipe further comprises: During the grouting process, the grouting time and the grouting flow rate are adjusted according to the real-time monitoring data of the shield tunnel to be rectified, so that the lifting value of the shield tunnel to be rectified per unit time is within a set range.

5. The polymer grouting method according to claim 1, characterized in that: A group of grouting holes are respectively arranged on the left and right sides of the shield tunnel to be rectified, and polymer grouting material is simultaneously injected into the grouting pipes in the two groups of grouting holes to balance the left and right sides of the shield tunnel to be rectified.

6. The polymer grouting method according to claim 1, characterized in that: The expanded side of the grouting bag is arranged toward the tunnel segment, and the grouting bag is filled with polymer grouting material and then fits with the tunnel segment.

7. The polymer grouting method according to claim 1, characterized in that: The method further comprises: Stop grouting after the polymer grouting material injected into the formation solidifies; Seal the grouting pipe and the gap between the grouting pipe and the grouting hole.

8. A polymer grouting system for tunnel deformation treatment, characterized in that: include: Data analysis unit, used to obtain the grouting area and deformation of the shield tunnel to be rectified; A drilling unit is used to determine the drilling position according to the grouting area and deformation amount, and drill a hole under the tunnel segment to form a grouting hole; The grouting unit comprises a grouting pipe, a grouting bag and a grouting device for injecting polymer grouting material into the grouting pipe. The grouting pipe is connected to the grouting end of the grouting device, and the grouting bag is connected to the grouting section of the grouting pipe and extends into the grouting hole through the grouting pipe.

9. The polymer grouting system according to claim 8, characterized in that: The grouting section is provided with a first grouting hole and a second grouting hole, the grouting bag is connected with the first grouting hole, and a blocking layer is provided on the second grouting hole. After the grouting bag is filled with polymer grouting material, the polymer grouting material breaks through the blocking layer and is injected into the soil layer.

10. The polymer grouting system according to claim 9, characterized in that: The number of the first pulp outlet holes is greater than the number of the second pulp outlet holes, and the aperture of the first pulp outlet holes is greater than the aperture of the second pulp outlet holes.

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