A method for treating a damaged structure of a shield tunnel

Abstract

The application relates to the technical field of tunnel disease treatment, and particularly discloses a shield tunnel disease structure treatment method, which comprises the following steps: opening a reinforcing process groove at the crack of a tunnel segment, chiseling the disease structure on the inner side of the tunnel segment, forming a concave groove after the disease structure is chiseled, the concave groove being communicated with the reinforcing process groove, installing a reinforcing device into the reinforcing process groove, filling cement mortar into the concave groove, injecting concrete slurry into the outer pipe, and completing the treatment of the shield tunnel disease after the cement mortar and the concrete slurry are cured. The application has the beneficial effect that the crossbeam and the pull rod form a cross-shaped framework structure, so that the strength of the treated part is significantly increased, the push force on the water stop strip is continuously generated, the water stop strip is tightly contacted with the groove wall of the reinforcing process groove, the water stopping effect is improved, and secondary grouting can be carried out after the treatment is completed, so that the strength of the treated part is further improved.

Description

Technical Field

[0001] This invention relates to the field of tunnel defect treatment technology, and in particular to a method for treating structural defects in shield tunnels. Background Technology

[0002] Shield tunnels, as a crucial component of urban rail transit, highway transportation, and municipal pipelines, play a vital role in modern urban construction. However, during long-term operation, shield tunnel structures are susceptible to various defects and damages due to multiple factors, including geological conditions, hydrological environment, construction quality, load variations, and material aging, collectively referred to as "damaged structures." The integrity of the shield tunnel segments, as the main load-bearing components of the tunnel structure, directly affects the tunnel's structural safety, waterproofing performance, and durability. Segment cracks not only compromise the overall structural integrity, reducing its bending, compressive, and shear strength, but can also become channels for groundwater leakage, leading to a series of secondary defects such as steel corrosion, concrete carbonation, and freeze-thaw damage. In severe cases, this can cause tunnel structural instability, threatening operational safety. Current technologies primarily employ localized repair methods for segment cracks. These methods involve chiseling away the cracked areas and areas of concrete spalling, then repairing them with materials such as polymer mortar and epoxy resin. This method is simple to implement, but its effect on repairing deep or structural damage is limited. On the one hand, it is difficult to restore the overall load-bearing capacity. On the other hand, concrete spalling is usually caused by tunnel water seepage, and this method cannot deal with tunnel water seepage damage. Even after the treatment is completed, the treated area will still be damaged by water seepage in the later stage. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a method for treating structural defects in shield tunnels.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A method for treating structural defects in shield tunnels involves creating reinforcement trenches at cracks in tunnel segments, removing the damaged structures on the inner side of the tunnel segments to form concave trenches, which are connected to the reinforcement trenches. A reinforcement device is installed inside the reinforcement trench, comprising multiple outer tubes inserted along the reinforcement trench into the geological layer outside the tunnel segments. An inner tube is installed inside each outer tube, with a rotatable crossbeam at the upper end of the inner tube. The crossbeams are located within the concave trench, and the multiple crossbeams are fixed together by tie rods. Concrete mortar is filled into the concave trench, and concrete grout is injected into the outer tubes. After the concrete mortar and concrete grout have cured, the treatment of the shield tunnel defects is complete.

[0006] Furthermore, multiple limiting grooves are provided on the side wall of the concave groove, and the crossbeams are inserted into the limiting grooves one by one.

[0007] Furthermore, a water-stopping device is provided in the reinforcement process trench. The water-stopping device includes two water-stopping strips, with an outer tube located between the two water-stopping strips. The water-stopping strips are provided with relief grooves, which are correspondingly set with the outer tube. Each water-stopping strip has a sliding groove on one side, and a water-stopping strip is provided between the two water-stopping strips. The two ends of the water-stopping strip are located in the sliding grooves and can slide back and forth along the sliding grooves. The water-stopping strip is provided with relief holes, through which the outer tube passes.

[0008] Furthermore, the inner tube is slidably connected to the core tube, and two extrusion inclined blocks are fixedly connected to the outside of the core tube. The inner tube wall is provided with a through groove, and the extrusion inclined blocks are located in the through groove. The outer tube wall is provided with a guide groove, and a moving block is provided in the guide groove. The moving block is corresponding to the waterstop strip. One side of the moving block is provided with an inclined surface, which is corresponding to the extrusion inclined block.

[0009] Furthermore, the upper end of the inner tube is rotatably connected to the rotating ring via a rotating shaft, and the crossbeam is fixedly connected to the rotating ring. A semi-circular protrusion is provided on the outer side of the rotating ring, and the semi-circular protrusion is correspondingly set at the upper end of the core tube. When the crossbeam rotates, the core tube can slide inside the inner tube. Under the action of the squeezing inclined block and the moving block, the two waterstop strips are separated, thereby making the waterstop strips in close contact with the side wall of the reinforced process tank.

[0010] Furthermore, the rotating ring is provided with a pin hole, which passes through the rotating ring and the semi-circular protrusion in sequence.

[0011] Advantages of this invention: The crossbeams and tie rods form a cross-shaped skeleton structure, which significantly increases the strength of the treated area and can continuously exert thrust on the waterstop strip, making the waterstop strip in close contact with the wall of the reinforced process trench, thereby improving the water-stopping effect. After the treatment is completed, secondary grouting can be performed to further improve the strength of the treated area. Attached Figure Description

[0012] Figure 1 This is a reference diagram of a method for treating structural defects in shield tunnels provided by the present invention;

[0013] Figure 2 yes Figure 1 Enlarged view of point A;

[0014] Figure 3 This is a schematic diagram of the basic structure of the reinforcement device;

[0015] Figure 4 yes Figure 3 Enlarged view at point M;

[0016] Figure 5 This is a cross-sectional view of the inner surface of the outer tube;

[0017] Figure 6 yes Figure 5 Enlarged view of N points;

[0018] Figure 7 yes Figure 5 The main view;

[0019] Figure 8 yes Figure 7 Enlarged view of point H. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0021] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0022] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0023] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0024] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] like Figures 1-8 As shown in this embodiment, a method for treating structural defects in a shield tunnel involves creating a reinforcement groove 101 at the crack in the tunnel segment 100. The depth of the reinforcement groove 101 is determined according to the crack depth. Simultaneously, the spalled concrete portion on the inner side of the tunnel segment 100 is removed, forming a concave groove 102. The concave groove 102 is connected to the reinforcement groove 101, and a reinforcement device is installed inside the reinforcement groove 101.

[0027] The reinforcement device includes multiple outer tubes 1, which are inserted into the geological layer 200 outside the tunnel segment 100 along the reinforcement process groove 101. An inner tube 4 is installed inside the outer tube 1, forming an annular cavity between the inner tube 4 and the outer tube 1. A crossbeam 2 is rotatably connected to the upper end of the inner tube 4. The crossbeam 2 is located within a concave groove 102. Multiple crossbeams 2 are fixed together by tie rods 300. Concrete mortar is filled into the concave groove 102, and concrete grout is injected into the outer tubes 1. After the concrete mortar and concrete grout have cured, the damage to the shield tunnel is repaired. After repair, one end of the outer tube 1 is located within the geological layer 200, while the crossbeam 2 is located within the concave groove 102, and tie rods 300 are installed between the crossbeams 2. This design forms a cross-shaped skeleton structure between the crossbeams 2 and the tie rods 300, which, compared to the existing method of directly smoothing with concrete mortar, adds a skeleton structure, significantly increasing the strength of the repaired area.

[0028] In a preferred embodiment of the present invention, a plurality of limiting grooves 103 are provided on the side wall of the concave groove 102, and the crossbeams 2 are inserted into the limiting grooves 103 one by one. After the crossbeams 2 are placed in the limiting grooves 103, the crossbeams 2 can be restricted from shifting along the axis of the tunnel, which can further improve the strength of the treated part.

[0029] In a preferred embodiment of the present invention, to prevent damage to the treated area due to continuous water seepage, the following design is made in this embodiment: a water-stopping device 3 is provided in the reinforcement process trench 101 to prevent water penetration. Specifically, the water-stopping device 3 includes two water-stopping strips 31, which are made of rigid rubber. The outer tube 1 is located between the two water-stopping strips 31. The water-stopping strips 31 are provided with relief grooves 30, which are semi-circular grooves. The relief grooves 30 are correspondingly arranged with the outer tube 1, that is, the outer tube 1 is located in the semi-circular groove. Each water-stopping strip 31 has a sliding groove 32 on one side, and a water-stopping strip 33 is provided between the two water-stopping strips 31. The water-stopping strip 33 is made of copper. Both ends of the water-stopping strip 33 are located in the sliding groove 32 and can slide back and forth along the sliding groove 32. The water-stopping strip 33 is provided with relief holes, through which the outer tube 1 passes.

[0030] During the actual construction process, gaps are easily generated between the waterstop strip 31 and the wall of the reinforcement process groove 101, and seepage water can easily seep continuously from the gaps. In order to avoid the seepage water from continuously seeping from the gaps, this embodiment makes the following design: the core tube 6 is slidably connected inside the inner tube 4, and two extrusion inclined blocks 61 are fixedly connected to the outside of the core tube 6. The inner tube 4 has a through groove 41 on its wall, and the extrusion inclined blocks 61 are located in the through groove 41. The outer tube 1 has a guide groove 11 on its wall, and a moving block 7 is provided in the guide groove 11. The moving block 7 is correspondingly set with the waterstop strip 31. One side of the moving block 7 has an inclined surface, which is correspondingly set with the extrusion inclined block 61. With this design, when the core tube 6 moves downward, the extrusion block 61 also moves downward. The extrusion block 61 exerts a downward extrusion force on the moving block 7. Under the action of the inclined surface of the moving block 7, this extrusion force can make the moving block 7 slide outward along the guide groove 11. During the outward movement of the moving block 7, it will exert a thrust on the waterstop strip 31, so that the waterstop strip 31 is in close contact with the groove wall of the reinforcement process groove 101.

[0031] To facilitate the sliding of the core tube 6 within the inner tube 4 and prevent it from retracting within the inner tube 4, this embodiment employs the following design: a rotating ring 5 is rotatably connected to the upper end of the inner tube 4 via a rotating shaft 51. The crossbeam 2 is fixedly connected to the rotating ring 5. A semi-circular protrusion 52 is provided on the outer side of the rotating ring 5, corresponding to the upper end of the core tube 6. When the crossbeam 2 rotates, the semi-circular protrusion 52 exerts a squeezing force on the core tube 6, thereby enabling the core tube 6 to slide within the inner tube 4. Under the action of the squeezing inclined block 61 and the moving block 7, the two water-stop strips 31 separate, allowing the water-stop strips 31 to make tight contact with the side wall of the reinforced process groove 101, thus improving the water-stopping effect. To prevent the core tube 6 from retracting within the inner tube 4, a pin hole 53 is provided on the rotating ring 5, which passes through the rotating ring 5 and the semi-circular protrusion 52 in sequence. After the crossbeam 2 has rotated, the pin hole 53 is coaxially aligned with the core tube 6. At this point, the pin 9 is inserted into the pin hole 53, and its lower end is fixed to the core tube 6 with an interference fit. Thus, under the action of the pin 9, the rotating ring 5 can no longer rotate, and the crossbeam 2 is simultaneously locked. This ensures the stability of the crossbeam 2, effectively acting as a skeleton structure to enhance the stability after treatment. Furthermore, it allows the moving block 7 to continuously exert thrust on the waterstop strip 31, improving the water-stopping effect.

[0032] The pin 9 has a central hole. After the concrete mortar and concrete slurry have cured, after the pin 9 is installed, secondary grouting is performed into the central hole to further improve the reinforcement and water-stopping effect. The concentration of the secondary grouting slurry should be lower than that of the concrete slurry injected into the outer pipe 1.

Claims

1. A method for treating structural defects in shield tunnels, characterized in that, A reinforcement groove (101) is made at the crack in the tunnel segment (100). The damaged structure on the inner side of the tunnel segment (100) is removed, forming a concave groove (102). The concave groove (102) is connected to the reinforcement groove (101). A reinforcement device is installed in the reinforcement groove (101). The reinforcement device includes multiple outer tubes (1). The outer tubes (1) are inserted into the tunnel segment (100) along the reinforcement groove (101). In the outer geological layer (200), the outer tube (1) is provided with an inner tube (4), and the upper end of the inner tube (4) is rotatably connected to a crossbeam (2). The crossbeam (2) is located in the concave groove (102). Multiple crossbeams (2) are fixed together by tie rods (300). Concrete mortar is filled into the concave groove (102), and concrete grout is injected into the outer tube (1). After the concrete mortar and concrete grout have cured, the treatment of the shield tunnel defects is completed.

2. The method for treating structural defects in a shield tunnel according to claim 1, characterized in that: The concave groove (102) has multiple limiting grooves (103) on its side wall, and the crossbeam (2) is inserted into the limiting groove (103) one by one.

3. The method for treating structural defects in a shield tunnel according to claim 1, characterized in that: The reinforcement process groove (101) is provided with a water-stopping device (3). The water-stopping device (3) includes two water-stopping strips (31). The outer tube (1) is located between the two water-stopping strips (31). The water-stopping strips (31) are provided with relief grooves (30). The relief grooves (30) are correspondingly provided with the outer tube (1). Each water-stopping strip (31) is provided with a sliding groove (32) on one side. A water-stopping strip (33) is provided between the two water-stopping strips (31). The two ends of the water-stopping strip (33) are respectively located in the sliding grooves (32) and can slide back and forth along the sliding grooves (32). The water-stopping strip (33) is provided with relief holes. The outer tube (1) passes through the relief holes.

4. The method for treating structural defects in a shield tunnel according to claim 3, characterized in that: The inner tube (4) is slidably connected to the core tube (6), and two extrusion inclined blocks (61) are fixedly connected to the outside of the core tube (6). The inner tube (4) has a through groove (41) on its wall, and the extrusion inclined block (61) is located in the through groove (41). The outer tube (1) has a guide groove (11) on its wall, and a moving block (7) is provided in the guide groove (11). The moving block (7) is correspondingly set to the waterstop strip (31). One side of the moving block (7) has an inclined surface, which is correspondingly set to the extrusion inclined block (61).

5. The method for treating structural defects in a shield tunnel according to claim 4, characterized in that: The upper end of the inner tube (4) is rotatably connected to the rotating ring (5) via the rotating shaft (51). The crossbeam (2) is fixedly connected to the rotating ring (5). The outer side of the rotating ring (5) is provided with a semi-circular protrusion (52). The semi-circular protrusion (52) is correspondingly arranged with the upper end of the core tube (6). When the crossbeam (2) rotates, the core tube (6) can slide inside the inner tube (4). Under the action of the extrusion inclined block (61) and the moving block (7), the two water-stop strips (31) are separated, so that the water-stop strips (31) are in close contact with the side wall of the reinforcement process groove (101).

6. The method for treating structural defects in a shield tunnel according to claim 5, characterized in that: The rotating ring (5) is provided with a pin hole (53), which passes through the rotating ring (5) and the semi-circular protrusion (52) in sequence.

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