Film bag grouting device and grouting method for preventing shield tunnel duct piece displacement

Abstract

The invention provides a film bag grouting device and method for preventing shield tunnel segment displacement, and can be applied to the technical field of tunnel engineering. The grouting device comprises a film bag, wherein the first diameter of the film bag close to the tunnel segment end is smaller than the second diameter of the film bag far away from the tunnel segment end; the grouting pipe is configured to pass through a preformed hole in the tunnel pipe piece, one end of the grouting pipe is embedded into the tunnel pipe piece, the other end of the grouting pipe is embedded into a soil body outside the tunnel pipe piece, and a plurality of grout outlet holes are formed in the pipe wall of the grouting pipe and used for grouting the film bag; and the fixing mechanism comprises a plurality of first fixing sub-mechanisms and second fixing sub-mechanisms according to different fixing positions, and the fixing mechanism is used for fixing and sealing the film bag. By means of the grouting device, the grouting amount and the grouting range can be accurately controlled, the grouting efficiency is improved, and the displacement resistance of tunnel segments is improved.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel engineering, and in particular to a membrane bag grouting device and a grouting method for preventing displacement of shield tunnel segments. Background Art

[0002] During shield tunnel construction, the overlying soil pressure and lateral soil pressure are constantly changing. The release of stratum stress caused by the unloading effect of excavation and the consolidation of soil will cause the displacement of tunnel segments. On the other hand, when the foundation pit or tunnel construction is carried out near the existing tunnel, the soil around the existing subway tunnel is disturbed due to the unloading effect caused by excavation, and its original stress field changes accordingly, causing the displacement of the existing tunnel segments. When the displacement of the tunnel segments is too large, it will cause damage, misalignment, leakage and other safety problems in the tunnel structure, which greatly affects the overall impermeability of the tunnel and the durability of normal use. In the related technology, grouting is mainly carried out directly into the stratum, and a specific slurry (such as cement slurry, chemical slurry, etc.) is injected into the stratum around the tunnel to cause the stratum to condense and solidify.

[0003] However, when grouting directly into the stratum, the slurry diffusion law is more complicated, and the grouting range, grouting volume and grouting pressure are difficult to control. When the grouting pressure is too high, it will also have an adverse effect on the surrounding existing buildings. When grouting in water-rich strata, the slurry is easily dispersed by groundwater, affecting the coagulation and hardening of the slurry, resulting in poor effect in preventing the displacement of tunnel segments. Summary of the invention

[0004] In view of the above problems, the present invention provides a membrane bag grouting device and a grouting method for preventing displacement of shield tunnel segments.

[0005] According to a first aspect of the present invention, there is provided a membrane bag grouting device for preventing displacement of shield tunnel segments, comprising: a membrane bag, wherein a first diameter of the membrane bag adjacent to the tunnel segment end is smaller than a second diameter away from the tunnel segment end; a grouting pipe, wherein the grouting pipe is configured to pass through a reserved hole in the tunnel segment, with one end embedded in the tunnel segment and the other end embedded in soil outside the tunnel segment, wherein a plurality of grouting holes are arranged on the wall of the grouting pipe for grouting into the membrane bag; and a fixing mechanism, comprising a plurality of first fixing sub-mechanisms and second fixing sub-mechanisms according to different fixing positions, wherein the fixing mechanism is used for fixing and sealing the membrane bag.

[0006] According to an embodiment of the present invention, the first fixing sub-mechanism is used to fix one end of the membrane bag to the end of the grouting pipe adjacent to the tunnel segment, and the second fixing sub-mechanism is used to fix the other end of the membrane bag to the end of the grouting pipe away from the tunnel segment.

[0007] According to an embodiment of the present invention, the second fixing sub-mechanism is a metal cone, which is used to reduce the resistance when the membrane bag grouting device is pushed into the drilling hole.

[0008] According to an embodiment of the present invention, before the grouting operation, the grouting pipe is wrapped by a film bag, and the film bag is in a folded and contracted state and close to the grouting pipe. After the grouting operation is completed, the film bag is in a truncated cone or a frustum shape.

[0009] According to an embodiment of the present invention, the fixing mechanism further comprises a fixing pad, and the fixing pad is used to fix one end of the grouting pipe to the tunnel segment.

[0010] According to an embodiment of the present invention, a plurality of slurry outlet holes are provided on the wall of a grouting pipe embedded in a tunnel segment, and slurry is injected through the plurality of slurry outlet holes to fill the gap between the grouting pipe and the tunnel segment.

[0011] According to an embodiment of the present invention, the slurry is prepared by mixing water, slightly expansive cement, a retarder and a water reducing agent in a preset proportion.

[0012] According to an embodiment of the present invention, the interface between the membrane bag and the soil is a rough composite barrier material, which is used to increase the frictional resistance between the membrane bag and the soil.

[0013] The second aspect of the present invention provides a membrane bag grouting method based on a grouting device, comprising: using prefabricated fixing materials to fix the membrane bag in a folded and contracted state to the grouting pipe; using drilling equipment to drill holes in the stratum through the reserved holes of the tunnel segments, and the drilling depth is greater than the length of the grouting pipe; grouting is performed into the soil layer and the reserved holes by the grouting device, and after the grouting is completed, non-shrinkage concrete is poured at the reserved holes to seal the anchors.

[0014] According to an embodiment of the present invention, grouting is performed into the soil layer and the reserved holes through a grouting device, including: grouting into the membrane bag through a grouting pipe based on a preset grouting pressure value, using the grouting membrane bag to squeeze the soil in the soil layer to increase the frictional resistance between the membrane bag and the soil; grouting is performed using the grouting holes on the grouting pipe in the tunnel segment to fill the gap in the reserved hole between the grouting pipe and the tunnel segment, fixing the grouting device, and stopping grouting when the preset grouting amount is reached.

[0015] According to the membrane bag grouting device for preventing the displacement of shield tunnel segments provided by the present invention, the grouting amount and grouting range of the grouting into the soil layer can be more accurately controlled by the membrane bag of preset volume and shape, which can avoid the excessive or insufficient slurry volume caused by traditional direct grouting, improve the grouting efficiency, and avoid slurry waste. Since the membrane bag isolates the influence of groundwater, slurry waste is avoided, cost is saved, and the extrusion and self-locking effect generated by the truncated cone-shaped membrane bag increases the frictional resistance between the membrane bag and the soil, and improves the ability of the tunnel segment to resist displacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above contents and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0017] Figure 1 A schematic diagram of a membrane bag grouting device for preventing displacement of shield tunnel segments according to an embodiment of the present invention is shown.

[0018] Figure 2 A schematic diagram of a first fixing sub-mechanism according to an embodiment of the present invention is shown.

[0019] In the accompanying drawings, the meanings of the reference numerals are as follows:

[0020] 1. Film bag;

[0021] 2. Grouting pipe;

[0022] 21 pulp outlet hole;

[0023] 3.Fixed mechanism;

[0024] 31 first fixing sub-mechanism;

[0025] 311 bolts;

[0026] 32 second fixing sub-mechanism;

[0027] 33 fixed pad;

[0028] 4. Tunnel segments;

[0029] 41 reserved holes. DETAILED DESCRIPTION

[0030] Below, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of embodiments of the present invention. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of concepts of the present invention.

[0031] The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0032] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0033] When using expressions such as "at least one of A, B, and C, etc.", they should generally be interpreted according to the meaning of the expression commonly understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0034] In the related art, the displacement of tunnel segments is controlled by directly grouting into the soil layer. The diffusion law of the slurry is relatively complex, and the grouting range, grouting volume and grouting pressure are difficult to control. When the grouting pressure is too high, it will also have an adverse effect on the surrounding existing buildings. When grouting in water-rich strata, the slurry is easily dispersed by groundwater, which affects the coagulation and hardening of the slurry, resulting in poor effect in preventing the displacement of tunnel segments.

[0035] In view of this, the present invention controls the grouting amount and grouting range of the soil layer more accurately by presetting the volume and shape of the membrane bag, which can avoid the excessive or insufficient slurry volume caused by traditional direct grouting, improve the grouting efficiency, and avoid slurry waste. Since the membrane bag isolates the influence of groundwater, slurry waste is avoided, cost is saved, and the extrusion and self-locking effect generated by the truncated cone-shaped membrane bag increases the frictional resistance between the soil and the soil, and improves the tunnel segment's ability to resist displacement.

[0036] An embodiment of the present invention provides a membrane bag grouting device and a grouting method for preventing the displacement of shield tunnel segments. The grouting device includes: a membrane bag, wherein a first diameter of the membrane bag adjacent to the tunnel segment end is smaller than a second diameter away from the tunnel segment end; a grouting pipe, wherein the grouting pipe is configured to pass through a reserved hole in the tunnel segment, with one end embedded in the tunnel segment and the other end embedded in the soil outside the tunnel segment, and a plurality of slurry outlet holes are arranged on the wall of the grouting pipe for grouting into the membrane bag; a fixing mechanism, comprising a plurality of first fixing sub-mechanisms and a second fixing sub-mechanisms according to different fixing positions, and the fixing mechanism is used to fix and seal the membrane bag.

[0037] Figure 1 A schematic diagram of a membrane bag grouting device for preventing displacement of shield tunnel segments according to an embodiment of the present invention is shown.

[0038] like Figure 1 As shown, the membrane bag grouting device for preventing the displacement of shield tunnel segments includes:

[0039] A membrane bag 1, wherein a first diameter of the membrane bag 1 at the end adjacent to the tunnel segment 4 is smaller than a second diameter at the end distant from the tunnel segment 4; a grouting pipe 2, wherein the grouting pipe 2 is configured to pass through a reserved hole 41 in the tunnel segment 4, with one end embedded in the tunnel segment 4 and the other end embedded in the soil outside the tunnel segment 4, and a plurality of slurry outlet holes are arranged on the pipe wall of the grouting pipe 2 for grouting into the membrane bag 1; a fixing mechanism 3, comprising a plurality of first fixing sub-mechanisms 31 and a second fixing sub-mechanisms 32 according to different fixing positions, and the fixing mechanism 3 is used for fixing and sealing the membrane bag 1.

[0040] In an embodiment of the present invention, a tunnel segment can represent an outer wall of a tunnel in a tunnel project. The membrane bag 1 can be used to encapsulate and control the slurry injected into the soil layer outside the tunnel segment. In order to improve the ability of the tunnel segment to resist displacement, the diameter of the membrane bag 1 gradually increases from the end close to the tunnel segment to the end far from the tunnel segment. For example, the second diameter can be 1 to 2 times the first diameter.

[0041] In the embodiment of the present invention, the total length of the grouting pipe 2 can be determined according to the actual situation, the length of the first end of the grouting pipe 2 embedded in the tunnel segment is determined by the actual thickness of the tunnel segment, and the length of the second end embedded in the soil layer is the difference between the total length and the length of the first end. A plurality of grouting holes 21 are provided on the pipe wall at the first end and the second end, and the number of the grouting holes 21 can be determined according to the actual grouting speed requirements, which is not specifically limited here.

[0042] In the embodiment of the present invention, the fixing mechanism 3 can be used to detachably connect and fix one end of the film bag 1 to one end of the grouting pipe 2, and the first fixing sub-mechanism 31 can be set at the position where the grouting pipe 2 initially enters the soil layer, and the diameter of the first fixing sub-mechanism 31 is smaller than the diameter of the drilled hole in the soil layer; the second fixing sub-mechanism 32 can be used to connect and fix the other end of the film bag 1 to the other end of the grouting pipe. It can be understood that the two ends of the film bag 1 can be fixedly sleeved on the surface of the grouting pipe 2 through the first fixing sub-mechanism 31 and the second fixing sub-mechanism.

[0043] According to the embodiments of the present invention, the grouting amount and grouting range of the soil layer can be more accurately controlled by using a membrane bag with a preset volume and shape, which can avoid the excessive or insufficient slurry volume caused by traditional direct grouting, improve the grouting efficiency, and avoid slurry waste. Since the membrane bag isolates the influence of groundwater, slurry waste is avoided, and costs are saved, the squeezing and self-locking effects generated by the truncated cone-shaped membrane bag increase the frictional resistance between the soil and the soil, and improve the tunnel segment's ability to resist displacement.

[0044] According to an embodiment of the present invention, the first fixing sub-mechanism 31 is used to fix one end of the membrane bag 1 at the end of the grouting pipe 2 adjacent to the tunnel segment 4, and the second fixing sub-mechanism 32 is used to fix the other end of the membrane bag 1 at the end of the grouting pipe 2 away from the tunnel segment 4.

[0045] Figure 2 A schematic diagram of a first fixing sub-mechanism according to an embodiment of the present invention is shown.

[0046] like Figure 2 As shown, the first fixing sub-mechanism 31 can be a disk-like metal body with a plurality of fixing holes opened on the periphery for connecting other components, such as flanges and flange plates. The first fixing sub-mechanism 31 can also include bolts 311. It can be understood that the membrane bag 1 at one end adjacent to the tunnel segment 4 is fixed and connected to the grouting pipe 2 by the first fixing sub-mechanism 31, and the membrane bag 1 at one end away from the tunnel segment 4 is fixed and connected to the grouting pipe 2 by the second fixing sub-mechanism 32. It should be noted that the first fixing sub-mechanism and the second fixing sub-mechanism are both made of metal materials, and the specific material type can be determined according to actual conditions and is not limited here.

[0047] For example, the size of the grouting pipe matches the flange and the second fixing sub-mechanism of the metal cone. A flange of appropriate size and a steel conical end can be selected. The flange has several pre-holes for installing bolts, and the conical end is used to effectively clamp the membrane bag. One end of the membrane bag is inserted into the end of the grouting pipe to ensure that the membrane bag is in the correct position for subsequent clamping; the metal conical end is placed on the outer end of the membrane bag (the part in contact with the grouting pipe). The conical end can effectively clamp the membrane bag through compression force to ensure that the membrane bag is flat and without folding. The flange is connected to the end of the grouting pipe. The flange may include a sealing ring or a gasket that can provide a sealing effect during connection. One end of the membrane bag is set between the flange and the steel conical end.

[0048] It can be understood that the clamping effect of the flange and the steel conical end, combined with the bolt connection to fix and seal the membrane bag, can ensure the sealing and stability of the membrane bag during the grouting process. In specific implementation, the accessories and tightening strength can be adjusted according to the size of the membrane bag, the grouting pipe and the flange to ensure a good sealing effect to avoid leakage of the grouting material.

[0049] According to an embodiment of the present invention, the second fixing sub-mechanism 32 is a metal cone, which is used to reduce the resistance when the membrane bag grouting device is pushed into the drilling hole.

[0050] In the embodiment of the present invention, in order to reduce the resistance of the grouting device when advancing in the borehole, the second fixing sub-mechanism 32 can be configured as a cone, such as Figure 1 As shown, the second fixing sub-mechanism 32 of the metal cone can fix and protect the membrane bag 1 while reducing the soil resistance in the borehole. The second fixing sub-mechanism 32 and the grouting pipe 2 are detachably connected (for example, a spiral connection or a snap connection). The depth of the borehole is greater than the length of the grouting pipe. For example, if the length of the grouting pipe is l z , then the drilling depth lk =l z +3cm.

[0051] According to the embodiments of the present invention, the sealing property of the membrane bag is utilized to prevent slurry leakage. During the grouting process, the membrane bag can ensure that the slurry is only transported to the designated area through the grouting pipe, thereby preventing external pollution and slurry waste. The combination of the flange and the cone can ensure that the membrane bag is well sealed inside the grouting pipe, thereby reducing the risk of leakage.

[0052] According to an embodiment of the present invention, before the grouting operation, the grouting pipe 2 is wrapped by the membrane bag 1, and the membrane bag 1 is in a folded and contracted state and close to the grouting pipe 2. After the grouting operation is completed, the membrane bag 1 is in a truncated cone or a frustum shape.

[0053] In the embodiment of the present invention, in order to reduce the friction between the grouting device and the soil in the borehole, the membrane bag 1 before grouting is in a state of shrinkage and close contact with the grouting pipe through the fixing mechanism 3. Since the diameter of the membrane bag 1 near the end of the tunnel segment is smaller than the diameter far from the end of the tunnel segment, after the grouting operation, the volume of the membrane bag 1 filled with slurry is a truncated cone or a frustum.

[0054] Preferably, the diameter of the membrane bag 1 away from the tunnel segment end is twice the diameter of the membrane bag 1 adjacent to the tunnel segment end.

[0055] According to the embodiments of the present invention, the truncated cone or frustum-shaped membrane bag after grouting can enhance the stability of the structure. When subjected to external forces (such as pressure or tension), the wide bottom of the membrane bag can provide a larger support area, thereby avoiding deformation or displacement of the tunnel segment. Since the volume and shape of the membrane bag are pre-calculated and designed, the grouting range and grouting amount can be accurately controlled, and the grouting efficiency is improved. Due to the presence of the membrane bag, on the one hand, the slurry is prevented from randomly diffusing in the stratum, while reducing the adverse effects of the grouting construction on the adjacent environment. On the other hand, the membrane bag blocks the disturbance of the groundwater to the slurry, preventing the slurry from being dispersed by the groundwater, so that the slurry can be smoothly solidified and hardened, while also avoiding the waste of slurry and saving construction costs.

[0056] According to an embodiment of the present invention, the fixing mechanism further includes a fixing pad 33 , and the fixing pad 33 is used to fix one end of the grouting pipe 2 to the tunnel segment 4 .

[0057] In the embodiment of the present invention, in order to ensure a stable connection between the grouting pipe 2 and the tunnel segment 4, a fixed pad 33 may be provided according to the structure of the tunnel segment and the size and grouting requirements of the grouting pipe 2. Figure 1As shown, the size and shape of the fixed pad 33 match the contact surface shape of the tunnel segment, which can be determined according to the size and material of the tunnel segment. The fixed pad 33 may include holes or interfaces for fixing the grouting pipe so that the port of the grouting pipe is stable and does not move during grouting. The fixed pad 33 can be firmly mounted on the tunnel segment 4 using bolts, welding or other mechanical connection methods. For example, the fixed pad is connected to the tunnel segment by bolts or screws to ensure that the pad will not be displaced due to pressure.

[0058] It should be noted that the material of the fixed pad 33 can be selected from materials with high compressive strength, corrosion resistance and wear resistance, and can usually be steel, stainless steel or other alloy materials, which are not specifically limited here.

[0059] According to an embodiment of the present invention, a plurality of slurry outlet holes 21 are provided on the wall of the grouting pipe 2 embedded in the tunnel segment 4 for injecting slurry through the plurality of slurry outlet holes 21 to fill the gap between the grouting pipe 2 and the tunnel segment 4 .

[0060] In an embodiment of the present invention, a plurality of slurry outlet holes can be provided on the pipe wall of the grouting pipe section located in the tunnel segment 4. While the membrane bag 1 is grouting, slurry is injected through the plurality of slurry outlet holes to fill the gap between the grouting pipe 2 and the reserved hole of the tunnel segment.

[0061] In an embodiment of the present invention, the grouting holes 21 can be evenly distributed on the wall of the grouting pipe 2 to ensure that the slurry can evenly fill the gap between the tunnel segment and the grouting pipe. The size (diameter) and number of the grouting holes can be determined according to the requirements of grouting, the fluidity of the slurry and the structure of the tunnel segment. For example, the aperture of the grouting hole can be selected between 5 mm and 15 mm, which can ensure that the slurry passes smoothly without affecting the strength of the grouting pipe.

[0062] It can be understood that by reasonably designing the slurry outlet holes on the grouting pipe wall, the slurry can be injected into the reserved holes of the pipe segment while the membrane bag is grouting, filling the gap between the grouting pipe and the tunnel segment, thereby achieving the purpose of reinforcing the grouting pipe and the tunnel segment.

[0063] According to an embodiment of the present invention, the slurry is prepared by mixing water, slightly expansive cement, a retarder and a water reducing agent in a preset proportion.

[0064] In the embodiments of the present invention, micro-expansive cement can represent a cement designed by a preset formula, which can produce a small amount of expansion during the hydration process, thereby effectively offsetting the shrinkage phenomenon that may occur in concrete or cement-based materials during the hardening process. For example, expansive cement, sulfoaluminate expansive cement and micro-expansive cement mixture. Retarder can represent an admixture that delays the setting time of cement to meet subsequent construction requirements, such as polymer retarders, lignin sulfonate retarders and alcohol retarders. The selection and use of specific retarders can be determined according to climatic conditions, concrete construction time, and special requirements of the project, and are not limited here.

[0065] In an embodiment of the present invention, the slurry may be a slurry prepared from water, cement, a retarder and a water reducing agent, for example, a rapid hardening early strength slurry, wherein the water reducing agent may be a polycarboxylic acid. The slurry may also be pure cement slurry, for example, the cement may be 32.5 ordinary Portland cement, and the water-cement ratio is a mass ratio of cement to water of 1:0.55.

[0066] It can be understood that the configuration of the slurry is based on the standard of meeting the strength requirement for resisting the displacement of the tunnel segments, and the specific ingredients are not limited here.

[0067] According to an embodiment of the present invention, the interface between the membrane bag 1 and the soil is a rough composite barrier material, which is used to increase the frictional resistance between the membrane bag 1 and the soil.

[0068] In an embodiment of the present invention, the composite barrier material is a rough composite geotechnical material (such as a geomembrane), which has the characteristics of high tensile strength, good ductility, easy folding, corrosion resistance, good impermeability, etc., and the rough surface can increase the friction between it and the soil.

[0069] For example, composite barrier materials are materials composed of two or more layers of different materials, which may include a layer of high-density polyethylene (HDPE) film or polyvinyl chloride (PVC) film and another layer of geotextile. The surface of the composite barrier material can be designed to be rough to enhance the friction with the soil.

[0070] For example, composite barrier materials can be roughened by mechanical methods such as embossing, sanding or scoring to create a rough surface for the geomembrane. Roughening can be done during the production of the membrane or customized at the construction site; or by selecting materials that naturally have rough or high friction properties (such as certain polyvinyl chloride PVC or polyethylene HDPE materials); or by compounding a layer of geotextile (such as non-woven fabric) to the surface of the membrane to form a rough fiber surface. This composite structure not only provides higher friction, but also enhances the tensile strength and stability of the membrane.

[0071] According to an embodiment of the present invention, the membrane bag grouting method based on the grouting device includes operations S210 to S230.

[0072] In operation S210, the membrane bag is fixed to the grouting pipe in a folded and contracted state using prefabricated fixing materials;

[0073] In operation S220, a drilling device is used to drill a hole in the ground through the reserved hole of the tunnel segment, and the drilling depth is greater than the length of the grouting pipe;

[0074] In operation S230, grouting is performed into the soil layer and the reserved hole by a grouting device. After the grouting is completed, non-shrinkage concrete is poured into the reserved hole to seal the anchor.

[0075] In an embodiment of the present invention, the prefabricated fixing material can be a binding material of a special material, such as paper tape. Non-shrinkage concrete can be used to seal and anchor the reserved holes of the tunnel segments after grouting. The type of non-shrinkage concrete can be selected according to actual conditions, for example, self-compacting non-shrinkage concrete, chemical expansion type non-shrinkage concrete, micro-expansion type non-shrinkage concrete or expansion cement non-shrinkage concrete, which is not specifically limited here.

[0076] In another feasible embodiment, the membrane bag grouting method based on the grouting device may include operations S201 to S203.

[0077] In operation S201, prepare the film bag grouting device, exhaust the air in the film bag, and use paper tape to tie the film bag so that it is folded and contracted to fit tightly against the grouting pipe.

[0078] In operation S202, a hole is drilled in the ground using the reserved hole on the tunnel segment, the drilling depth is greater than the length of the grouting pipe by 3 cm, and then a membrane bag grouting device is placed in the drilled hole.

[0079] In operation S203, grouting is performed into the membrane bag through the grouting pipe using a preset grouting pressure, and after the grouting is completed, non-shrinkage concrete can be poured at the reserved holes of the tunnel segment to seal the anchor.

[0080] According to an embodiment of the present invention, grouting is performed into the soil layer and the reserved holes through a grouting device, including: grouting into the membrane bag through a grouting pipe based on a preset grouting pressure value, using the grouting membrane bag to squeeze the soil in the soil layer to increase the frictional resistance between the membrane bag and the soil; grouting is performed using the grouting holes on the grouting pipe in the tunnel segment to fill the gap in the reserved hole between the grouting pipe and the tunnel segment, fixing the grouting device, and stopping grouting when the preset grouting amount is reached.

[0081] In an embodiment of the present invention, grouting is performed into the membrane bag through the grouting pipe using a preset grouting pressure, so that the membrane bag continuously expands and squeezes the surrounding soil. At the same time, grouting can be performed using the grouting holes provided on the wall of the grouting pipe in the tunnel segment to fill the gap between the grouting pipe and the reserved hole of the tunnel segment, thereby playing the role of fixing the membrane bag grouting device. Grouting is stopped when the designed grouting volume is reached, which can effectively prevent the displacement of the segment. After the grouting process is completed, the floating slurry at the steel pad is cleaned, and non-shrinkage concrete is poured at the reserved hole of the segment to seal the anchor.

[0082] It will be appreciated by those skilled in the art that the features described in the various embodiments of the present invention may be combined and / or combined in various ways, even if such combinations or combinations are not explicitly described in the present invention. In particular, without departing from the spirit and teachings of the present invention, the features described in the various embodiments of the present invention may be combined and / or combined in various ways. All of these combinations and / or combinations fall within the scope of the present invention.

[0083] The embodiments of the present invention are described above. However, these embodiments are only for the purpose of illustration, and are not intended to limit the scope of the present invention. Although each embodiment is described above, it does not mean that the measures in each embodiment cannot be used in combination advantageously. Without departing from the scope of the present invention, those skilled in the art may make various substitutions and modifications, which should all fall within the scope of the present invention.

Claims

1. A membrane bag grouting device for preventing displacement of shield tunnel segments, characterized in that: The device comprises: A membrane bag (1), wherein a first diameter of the membrane bag (1) at an end adjacent to the tunnel segment (4) is smaller than a second diameter at an end distant from the tunnel segment (4); A grouting pipe (2), the grouting pipe (2) being configured to pass through a reserved hole (41) in the tunnel segment (4), with one end embedded in the tunnel segment (4) and the other end embedded in the soil outside the tunnel segment (4), a plurality of grouting holes (21) being provided on the pipe wall of the grouting pipe (2) for grouting into the membrane bag (1); The fixing mechanism (3) comprises a plurality of first fixing sub-mechanisms (31) and second fixing sub-mechanisms (32) according to different fixing positions, and the fixing mechanism (3) is used to fix and seal the film bag (1).

2. The membrane bag grouting device according to claim 1, characterized in that: The first fixing sub-mechanism (31) is used to fix one end of the membrane bag (1) to the end of the grouting pipe (2) adjacent to the tunnel segment (4), and the second fixing sub-mechanism (32) is used to fix the other end of the membrane bag (1) to the end of the grouting pipe (2) away from the tunnel segment (4).

3. The membrane bag grouting device according to claim 2, characterized in that: The second fixing sub-mechanism (32) is a metal cone, which is used to reduce the resistance of the membrane bag grouting device when it is pushed into the drilling hole.

4. The membrane bag grouting device according to claim 1, characterized in that: Before the grouting operation, the grouting pipe (2) is wrapped by the film bag (1), and the film bag (1) is in a folded and contracted state and tightly adheres to the grouting pipe (2). After the grouting operation is completed, the film bag (1) is in a truncated cone or a frustum shape.

5. The membrane bag grouting device according to claim 1, characterized in that: The fixing mechanism (3) further comprises a fixing pad (33), and the fixing pad (33) is used to fix one end of the grouting pipe (2) to the tunnel segment (4).

6. The membrane bag grouting device according to claim 1, characterized in that: The wall of the grouting pipe (2) embedded in the tunnel segment (4) is provided with a plurality of grouting holes (21) for injecting grout through the plurality of grouting holes (21) to fill the gap between the grouting pipe (2) and the tunnel segment (4).

7. The membrane bag grouting device according to claim 6, characterized in that: The slurry is prepared by mixing water, slightly expansive cement, a retarder and a water reducing agent in a preset proportion.

8. The membrane bag grouting device according to claim 4, characterized in that: The interface between the membrane bag (1) and the soil is a rough composite barrier material, which is used to increase the frictional resistance between the membrane bag (1) and the soil.

9. A membrane bag grouting method based on the membrane bag grouting device according to any one of claims 1 to 8, characterized in that: The method comprises: The membrane bag is fixed to the grouting pipe in a folded and contracted state using prefabricated fixing materials; Drilling a hole in the stratum through the reserved hole of the tunnel segment by using a drilling device, wherein the drilling depth is greater than the length of the grouting pipe; Grouting is performed into the stratum and the reserved hole by a grouting device. After the grouting is completed, non-shrinkage concrete is poured at the reserved hole to perform anchor sealing treatment.

10. The grouting method according to claim 9, characterized in that: Grouting is performed into the stratum and the reserved hole by a grouting device, including: Grouting is performed into the membrane bag through the grouting pipe based on a preset grouting pressure value, and the membrane bag after grouting is used to squeeze the soil in the stratum to increase the frictional resistance between the membrane bag and the soil; Grouting is performed using the grouting holes on the grouting pipe in the tunnel segment to fill the gap between the grouting pipe and the reserved hole of the tunnel segment, and the grouting device is fixed, and grouting is stopped when a preset grouting amount is reached.

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