An accident shield tunnel overall line adjustment repairing method

Abstract

The application belongs to the technical field of tunnel construction, and specifically discloses a method for repairing an overall line adjustment of an accident shield tunnel, which comprises the following steps: S1: drilling a hole from the ground to perform primary grouting on the accident tunnel; S2: setting a blocking door at the position of the end of the accident tunnel to perform secondary grouting on the accident tunnel from the position of the main structure of the station at the starting end; S3: reinforcing the main structure of the station at the starting end, constructing the enclosure structure of the expanded station, connecting the enclosure structure of the expanded station and the enclosure structure of the station at the starting end, and enclosing an expanded area; S4: excavating a foundation pit and partially demolishing the enclosure structure of the station at the starting end and the main structure of the station at the starting end; S5: constructing the main structure of the expanded station and connecting the main structure of the expanded station and the main structure of the station at the starting end; and S6: constructing a shield section connecting the main structure of the expanded station and the main structure of the station at the receiving end, and making the shield section avoid the accident tunnel. Through the method, the overall line adjustment of the accident tunnel can be repaired.

Description

Technical Field

[0001] This application belongs to the field of tunnel construction technology, and more specifically, relates to a method for overall alignment repair of a shield tunnel damaged in an accident. Background Technology

[0002] With the deepening of urbanization in China, rail transit, as an important urban symbol, has seen a surge in construction projects across major cities in recent years. However, this large-scale subway construction has also led to damage to existing tunnels due to issues with tunnel boring machine (TBM) equipment, improper construction operations, or external conditions. This is particularly true in silty sand strata, where pressurized water carrying soil can flood into the tunnel, causing ground subsidence and damage to tunnel segments. Following tunnel construction accidents, the complex geological conditions in the subsidence area make tunnel repair extremely difficult and risky, hindering the safe and reliable reopening of the existing station to the terminal station. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this application provides a method for the overall alignment and repair of accident-damaged shield tunnels, aiming to safely and reliably achieve smooth traffic flow between existing stations and the terminal station.

[0004] To achieve the above objectives, this application provides a method for overall alignment repair of a shield tunnel damaged in an accident, comprising the following steps:

[0005] S1: Drill a hole from the ground downwards and fill the inside of the accident tunnel with grout along the borehole;

[0006] S2: Set up a sealing gate at the end of the accident tunnel and carry out secondary grouting and filling of the accident tunnel from the main structure of the starting station;

[0007] S3: Reinforce the main structure of the originating station, construct the outer station enclosure structure, connect the outer station enclosure structure with the originating station enclosure structure to form an outer area;

[0008] S4: Excavate the foundation pit and partially break the retaining structure of the starting station and the main structure of the starting station, so that the main structure of the starting station in the outer expansion area is connected to the retaining structure of the outer expansion station.

[0009] S5: Construct the main structure of the extended station and connect the main structure of the extended station with the main structure of the originating station;

[0010] S6: Construct the shield tunnel section connecting the main structure of the extended station and the main structure of the receiving station, and ensure that the shield tunnel section avoids the accident tunnel, thereby completing the overall alignment and repair of the accident shield tunnel.

[0011] Compared with existing technologies, the technical solution conceived in this application, by expanding the original starting station and then adjusting the track in the expanded area to achieve shield tunneling connection between the expanded area and the main structure of the receiving station, avoids complex collapse areas, thus achieving overall connection between the starting and receiving stations with lower risk. During construction, utilizing the existing starting station structure to support the outer retaining structure of the expanded station ensures construction safety and stability. The method of first supporting and then treating the existing station structure guarantees a good and effective connection between the old and new structures, making the construction process safe and reliable.

[0012] As a further preferred embodiment, step S3 includes the following sub-steps:

[0013] S301: Arrange structural cutting lines on the main structure of the originating station;

[0014] S302: A reinforcing structure is set on one side of the structural cutting line to reinforce the floor slabs of the main structure of the starting station.

[0015] S303: Construct the outer station enclosure structure on the opposite side of the structural cutting line, construct the supporting enclosure structure on the top of the main structure of the starting station, and connect the outer station enclosure structure with the starting station enclosure structure.

[0016] S304: Construct a horizontal support structure connecting the top enclosure structure, the starting station enclosure structure, and the outward-extending station enclosure structure.

[0017] By adopting the above technical solutions, after reinforcing the main structure of the starting station with the reinforcement components, the stability of the backfill soil on top of the main structure of the starting station can be ensured by the construction support retaining structure, thus guaranteeing the safety of subsequent construction. After constructing the retaining structure of the expanded station, the horizontal support structure can not only ensure the stability of the backfill soil on top of the main structure of the starting station, but also provide horizontal support for the newly added station retaining structure, ensuring the stability of the newly added station retaining structure.

[0018] As a further preferred embodiment, in step S302, the reinforcement structure is arranged in multiple groups from bottom to top. Each group of reinforcement structures includes a frame column and a support beam set on the top of the frame column. The lower end of the frame column is fixed to one of the floor slabs, and the upper end of the support beam is attached to another floor slab.

[0019] By adopting the above technical solution, the support beam set at the top of the frame column is attached to the floor slab, and the load of the floor slab can be effectively transferred to the support beam and the frame column, which improves the structural stability of the main structure of the starting station and provides a guarantee for the construction of the supporting enclosure structure at the top of the main structure of the starting station.

[0020] As a further preferred embodiment, in step S303, the supporting enclosure structure includes: a retaining wall arranged on the upper part of the main structure of the starting station, and a capping beam arranged on the upper part of the retaining wall, wherein the retaining wall and the capping beam are both located directly above the reinforcement structure.

[0021] As a further preferred embodiment, in step S304, the constructed horizontal support structure includes a structural plate and a first support member. The structural plate and the first support member are respectively located on both sides of the capping beam and are both connected to the capping beam. One of the structural plate and the first support member is connected to the outer station enclosure structure, and the other of the two is connected to the starting station enclosure structure.

[0022] As a further preferred embodiment, in step S3, the area below the subbase is reinforced before constructing the outer enclosure structure of the station.

[0023] By adopting the above technical solutions to reinforce the area below the subbase, the overall coordination of the expanded station can be ensured and it is not easily deformed.

[0024] As a further preferred embodiment, in step S3, when constructing the outer station enclosure structure, high-pressure jet grouting is performed at the connection between the outer station enclosure structure and the starting station enclosure structure.

[0025] By adopting the above technical solution and performing high-pressure jet spraying on the connection parts, the connection reliability between the outer station enclosure structure and the starting station enclosure structure can be improved.

[0026] As a further preferred embodiment, in step S4, the excavation and demolition of the foundation pit are carried out layer by layer from top to bottom. The demolition area is the main structure of the starting station and the retaining structure of the starting station on the side of the structural cutting line close to the outer station retaining structure. As the soil is excavated, a second support structure is set layer by layer. The second support structure diagonally supports the outer station retaining structure on the uncut area of ​​the main structure of the starting station.

[0027] By adopting the above technical solution, layered excavation of the soil can ensure construction safety and facilitate construction personnel to check the seepage situation at the unsealing points of the old and new retaining structures, so that water-stopping operations can be carried out in a timely and effective manner during construction. As the soil is excavated and broken up, the second support structure set up layer by layer can ensure the stability of the outer station retaining structure. When the second support structure is constructed layer by layer, there is still soil and part of the starting station maintenance structure below it. The soil and part of the starting station maintenance structure can serve as a protective structure to ensure the construction safety of the second support structure.

[0028] As a further preferred embodiment, in step S5, when constructing the main structure of the extended station, a foundation layer is first constructed to connect the base plate of the main structure of the extended station to the main structure of the originating station. Then, the second support structure is dismantled layer by layer from bottom to top, and the main structure of the extended station is constructed simultaneously in the extended area.

[0029] By adopting the above technical solution, the treatment of the subbase can prevent the main structure of the outward-expanding station from being directly supported on the retaining structure, thus preventing stress concentration. The second supporting structure is removed layer by layer from bottom to top, and the main structure of the outward-expanding station is constructed in the outward-expanding area, which can ensure the construction stability of the main structure of the outward-expanding station on each layer.

[0030] As a further preferred embodiment, in step S5, when constructing the main structure of the extended station, the reinforcing bars of the bottom plate of the main structure of the extended station are connected to the reinforcing bars of the main structure of the originating station. The connection method is: split sleeve connection, straight thread sleeve connection, or welding.

[0031] By adopting the above technical solution, the steel bars of the bottom slab of the main structure of the outer station are connected with the steel bars of the main structure of the originating station, so that the bottom of the main structure of the outer station and the main structure of the originating station can be connected as a whole, and the new and old structures can be effectively combined.

[0032] In summary, compared with the prior art, the technical solutions conceived in this application have the following main technical advantages:

[0033] 1. By expanding the existing starting station and then adjusting the track within the expanded area to connect the main structure of the receiving station via tunnel boring machine (TBM), complex collapse zones can be avoided, thus achieving overall tunnel connection between the starting and receiving stations with lower risk. During construction, utilizing the existing structure of the starting station to support the retaining structure of the expanded station ensures safe and stable construction. This method of first supporting the existing station structure and then addressing it guarantees a good and effective connection between the old and new structures, making the construction process safe and reliable.

[0034] 2. After reinforcing the main structure of the starting station with reinforcement components, the stability of the backfill soil on top of the main structure of the starting station can be ensured by the construction support retaining structure, thus guaranteeing the safety of subsequent construction. After constructing the retaining structure of the expanded station, the horizontal support structure can not only ensure the stability of the backfill soil on top of the main structure of the starting station, but also provide horizontal support for the newly added station retaining structure, ensuring the stability of the newly added station retaining structure.

[0035] 3. Layered excavation ensures construction safety and facilitates the inspection of seepage at the points where the old and new retaining structures are unsealed, enabling timely and effective waterproofing during construction. The layered second support structure, installed alongside the excavation and demolition process, ensures the stability of the expanded station retaining structure. During the layered construction of the second support structure, the remaining soil and part of the starting station's maintenance structure act as a protective structure, ensuring the safety of the second support structure's construction. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the shield tunnel involved in the accident, as described in the embodiments of this application;

[0037] Figure 2 This is a schematic diagram of the outer station enclosure structure and the starting station enclosure structure in the embodiments of this application;

[0038] Figure 3 This is a schematic diagram of the overall alignment and repair of the shield tunnel involved in the accident, as illustrated in the embodiments of this application.

[0039] Figure 4 This is a schematic diagram of the arrangement of the reinforcing structure and supporting enclosure structure in the embodiments of this application;

[0040] Figure 5 This is a schematic diagram of the layout of the outer station enclosure structure in the embodiments of this application;

[0041] Figure 6 This is a schematic diagram showing the arrangement of the structural plate and the first support member in an embodiment of this application;

[0042] Figure 7 This is a schematic diagram of the arrangement of a group of second support members in an embodiment of this application;

[0043] Figure 8 This is a schematic diagram of the arrangement of the two sets of second support members in an embodiment of this application;

[0044] Figure 9 This is a schematic diagram of the erection of the support between the structural cutting line and the reinforcement structure in the embodiments of this application;

[0045] Figure 10 This is a preliminary construction schematic diagram of the main structure of the expanded station in this application embodiment;

[0046] Figure 11 This is a schematic diagram of the erection of the support structure in the outer expansion area in this application embodiment;

[0047] Figure 12 This is a schematic diagram of the overall structure of the main structure of the extended station in this application embodiment;

[0048] Figure 13This is a schematic diagram of the finished structure of the main structure of the starting station and the main structure of the extended station provided in the embodiments of this application.

[0049] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0050] 1. Accident Tunnel; 2. Sealing Gate; 3. Main Structure of Starting Station; 3-1. Floor Slab; 3-2. Floor Column; 3-3. Floor Beam; 4. Enclosure Structure of Starting Station; 5. Structural Cutting Line; 6. Enclosure Structure of Outward-Expanding Station; 7. Frame Column; 8. Support Beam; 9. Retaining Wall; 10. Crown Beam; 11. Backfill; 12. High-Pressure Jet Grouting Location; 13. Structural Slab; 14. First Support Component; 15. Second Support Component; 16. Longitudinal Beam; 17. Waist Beam; 18. Support Frame; 19. Subbase; 20. Main Structure of Receiving Station; 21. Reinforcement Zone; 22. Main Structure of Outward-Expanding Station; 23. Shield Tunnel Section; 24. Mortar; 100. Shield Machine; 200. Sediment. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0052] The following is in conjunction with the appendix Figure 1-13 This application will be described in further detail.

[0053] Reference Figure 1 During tunnel construction, such as subway tunnel construction, due to the deep burial depth of subway tunnels, the subway sections other than stations are usually constructed using shield tunneling. This typically involves two shield tunneling machines 100 starting from the main structure 3 of the starting station and tunneling towards the main structure 20 of the receiving station until they are received within the main structure 20. After a major accident during shield tunnel construction, a large amount of mud and sand 200 will flood into the tunnel. The soil around the shield tunneling machine 100 will suffer significant subsidence due to soil loss, resulting in large deformation (due to uneven external soil forces) or localized damage (due to the impact force of the shield tunneling machine 100 carried by mud and sand), forming the damaged section of the accident tunnel 1. To ensure smooth operation, this application discloses a method for overall alignment adjustment and repair of an accident-affected shield tunnel, which can expand the existing station to achieve a seamless connection between the overall line and the station.

[0054] Reference Figure 2-13 A method for overall alignment adjustment and repair of a shield tunnel damaged in an accident includes the following steps:

[0055] S1: Drill holes downwards on the ground above the accident tunnel 1. The holes should be arranged on the central axis of the tunnel, and the longitudinal spacing should be selected according to the preset value. The drill rod penetrates the top of the tunnel and mortar 24 is injected into the interior of the accident tunnel 1 to achieve one-time grouting and filling. The grouting ensures that the filling is dense and can effectively support the tunnel structure.

[0056] S2: A sealing gate 2 is installed at the end of the accident tunnel 1, and secondary grouting is performed on the accident tunnel 1 from the location of the main structure 3 of the starting station; the sealing gate 2 should preferably be a cast-in-place concrete sealing gate or a reinforced concrete sealing gate. The secondary grouting methods include, but are not limited to, the following:

[0057] 1. When constructing the sealing gate 2, simultaneously install grouting pipes and vent holes, and grout the accident tunnel 1 from the outside or inside of the main structure 3 of the starting station. The grouting material should have good fluidity to ensure that the filling section is filled.

[0058] 2. After the concrete sealing gate 2 is constructed, holes are drilled in the wall of the concrete sealing gate 2 or the main structure 3 of the starting station from the main structure 3 of the starting station to form grouting holes and vent holes. The grouting holes should be located above the vent holes. Grouting is carried out into the grouting holes to fill the accident tunnel 1 with secondary grouting.

[0059] S3: Reinforce the main structure 3 of the originating station, construct the outer station enclosure structure 6, and connect the outer station enclosure structure 6 to the originating station enclosure structure 4 to form the outer expansion area. High-pressure jet grouting reinforcement should be used at the connection points to ensure the connection performance. Figure 2 As shown, part of the high-pressure rotary jet position 12 is displayed.

[0060] like Figure 4-13 As shown, in some embodiments, step S3 includes the following sub-steps:

[0061] S301: Arrange structural cutting lines 5 on the main structure 3 of the starting station. The structural cutting lines 5 are preferably arranged at the haunch position of the floor slab 3-1 and the end position of the variable cross section. By setting the structural cutting lines 5, the subsequent cutting position of the starting station can be defined, and the position reference can also be provided for the construction of the subsequent expansion area.

[0062] S302: A reinforcing structure is provided inside the structural cutting line 5 to reinforce each floor slab 3-1 of the main structure 3 of the starting station. Since the main structure 3 of the starting station often has multiple layers, it includes multiple floor slabs 3-1 from bottom to top, such as a bottom slab, middle slab, and top slab, as well as some existing floor columns 3-2 and floor beams 3-3. Therefore, in some embodiments, multiple sets of reinforcing structures are provided from bottom to top. Each set of reinforcing structures includes at least a frame column 7 and a supporting beam 8 set on top of the frame column 7. The lower end of the frame column 7 is fixed to one of the floor slabs 3-1, and the upper end of the supporting beam 8 is attached to another floor slab 3-1.

[0063] like Figure 4 In one construction scheme, the centers of the upper and lower frame columns 7 need to be aligned. The reinforcing bars of the lower frame column 7 are anchored to the bottom slab of the main structure 3 of the starting station, and the upper frame column 7 penetrates the middle slab and connects to it. Drilling equipment should be used to assist in construction, and the drilling should avoid the existing reinforcing bars. The support beam 8 is fixed to the corresponding frame column 7 and is attached to the corresponding floor slabs 3-1 (middle slab and top slab) to ensure that the load of the floor slab 3-1 can be effectively transferred to the support beam 8 and the frame column 7. In some embodiments, small reinforcing bars (such as Φ10) can also be used to connect the floor slab 3-1 to the support beam 8 at a sparse spacing (such as 400mm spacing).

[0064] S303: Construct the extended station enclosure structure 6 outside the structural cutting line 5, and construct the supporting enclosure structure on top of the main structure 3 of the starting station. Then connect the extended station enclosure structure 6 to the starting station enclosure structure 4. The supporting enclosure structure includes: a retaining wall 9 located on the upper part of the main structure 3 of the starting station, and a capping beam 10 located on the upper part of the retaining wall 9. Both the retaining wall 9 and the capping beam 10 are located directly above the reinforcement structure. During this step, first excavate the backfill soil 11 of the area to be constructed, then construct the newly added retaining wall 9 and capping beam 10, and backfill the soil behind the wall after construction. The retaining wall 9 can be a trapezoidal plain concrete structure, which must meet the stability requirements of the backfill soil 11 to ensure the safety of subsequent construction. The capping beam 10 can be a reinforced concrete structure, usually arranged with a certain rigidity to ensure that the horizontal pressure transmitted by the support can be evenly distributed.

[0065] It should be noted that before constructing the outer station retaining structure 6, the bottom area of ​​the station needs to be inspected. If there is soft soil at the bottom of the station, the reinforcement area 21 of the planned area of ​​the outer station retaining structure 6 needs to be reinforced by using triaxial mixing or high-pressure jet grouting 12. The reinforcement method and parameters are the same as those of the original reinforcement area 21 to ensure the overall coordinated deformation of the station after the outer expansion.

[0066] S304: Construct the horizontal support structure connecting the top retaining structure, the starting station retaining structure 4, and the extended station retaining structure 6. When constructing the extended station retaining structure 6, high-pressure jet grouting 12 reinforcement treatment is required at the connection between the extended station retaining structure 6 and the original starting station retaining structure 4. At least three Φ800mm jet grouting piles should be installed at each joint location, and the reinforcement quality should be inspected.

[0067] In some embodiments, the constructed horizontal support structure includes a structural plate 13 and a first support member 14. The structural plate 13 and the first support member 14 are respectively disposed on both sides of the capping beam 10 and are both connected to the capping beam 10. One of the structural plate 13 and the first support member 14 is connected to the outer station enclosure structure 6, and the other is connected to the starting station enclosure structure 4. The first support member 14 can be any support structure with a support function, such as a support plate or a support column. It should be noted that in other embodiments, the horizontal support structure can also adopt other support plates, telescopic fixing rods, or other structures or equipment with support functions.

[0068] like Figure 6 As shown, in some embodiments, one end of the structural plate 13 is connected to the capping beam 10, and the other end is connected to the starting station enclosure structure 4, and the structural plate 13 is placed on the backfill soil 11 of the main structure 3 of the starting station; while the first support member 14 is connected to the capping beam 10 and the outer station enclosure structure 6, and the first support member 14 is located on the soil in the outer area.

[0069] S4: Excavate the foundation pit and partially break the retaining structure 4 of the starting station and the main structure 3 of the starting station, so that the main structure 3 of the starting station in the outer expansion area is connected to the retaining structure 6 of the outer expansion station.

[0070] like Figure 6-8 As shown, the excavation and demolition of the foundation pit are carried out layer by layer from top to bottom. When excavating the soil layer by layer, special attention should be paid to the seepage situation at the unsealed locations of the old and new retaining structures. During excavation, grouting machines and emergency materials such as cement are placed around the perimeter. The demolition area is the main structure 3 and the retaining structure 4 of the starting station, which are located on the side of the structural cutting line 5 near the outer station retaining structure 6. As the soil is excavated, a second supporting structure is set up layer by layer. The second supporting structure diagonally supports the outer station retaining structure 6 on the uncut area of ​​the main structure 3 of the starting station.

[0071] In some embodiments, the second support structure is preferably laid out obliquely upward along the direction from the main structure 3 of the starting station to the outer station enclosure structure 6 to prevent interference with the construction of the newly added outer station main structure 22; when constructing the second support structure, a hole is made locally on the main structure 3 of the starting station to ensure the smooth construction of the second support structure and the overall stability of the original station structure.

[0072] Furthermore, in this embodiment, the second support structure includes at least a second support member 15. One end of the second support member 15 abuts against a longitudinal beam 16 on the floor slab 3-1 of the main structure 3 of the starting station, and the other end abuts against a wainscoting 17 on the outer perimeter of the station enclosure structure 6. The longitudinal beam 16 can be constructed during the construction of the reinforcement structure or during the excavation of the soil layer by layer, while the wainscoting 17 can be constructed during the excavation of the soil layer by layer. In other embodiments, the second support structure can also be any support plate, support rod, or support device with a support function.

[0073] It should be noted that the longitudinal beam 16 in this embodiment must be arranged along its entire length and be fixed to the bottom plate and middle plate in the floor slab 3-1 and have a certain rigidity to ensure that the horizontal pressure transmitted by the support can be effectively transmitted to the floor slab 3-1 in the later stage. At the same time, the newly added longitudinal beam 16 should not be closely attached to the reinforcement structure to prevent the horizontal pressure transmitted by the support from causing damage to the reinforcement structure. In addition, the newly added longitudinal beam 16 can be in the shape of a right trapezoid, with the inclined surface perpendicular to the support direction of the second support member 15.

[0074] Furthermore, such as Figure 9 As shown, after the completion of the construction of the multiple second support structures, a support frame 18 is erected between the structural cutting line 5 and the reinforcement structure. The support frame 18 must be firmly supported against the middle plate and the top plate. The upper and lower vertical rods of the support frame 18 should be on the same axis to ensure that the middle plate and the top plate of the main structure 3 of the starting station will not deform during subsequent cutting. When cutting the main structure 3 of the starting station, it is advisable to use a wire saw or other cutting equipment to cut the top plate, middle plate, and bottom plate sequentially from top to bottom along the structural cutting line 5, and slowly break down the side walls from high to low, and then lift them out for crushing.

[0075] After the main structure 3 of the starting station is cut, the remaining soil in the outward expansion area is quickly excavated and the remaining retaining structure 4 of the starting station is broken. The retaining structure is broken down to at least below the cushion layer 19 to prevent the main structure 22 of the outward expansion station from being directly supported on the retaining structure and causing stress concentration.

[0076] S5: Construct the main structure 22 of the extended station and connect it to the main structure 3 of the originating station. Specifically, after the demolition in step S4 is completed, the foundation layer 19 is constructed, the bottom slab reinforcement of the originating station main structure 3 is exposed, and the bottom slab and partial side wall reinforcement of the extended station main structure 22 are tied. The bottom slab reinforcement of the extended station main structure 22 should be consistent with the diameter of the reinforcement of the originating station main structure 3 and be effectively connected. The connection method is: split sleeve connection, straight thread sleeve connection or welding. It is recommended to use split sleeve connection.

[0077] Specifically, the split sleeve consists of two symmetrical semi-cylindrical sleeves with outer conical surfaces and two locking sleeves with inner conical surfaces. The outer diameter of the semi-cylindrical sleeves decreases from the middle to both ends. During connection, the two sleeves with outer conical surfaces are placed at the joint of the two reinforcing bars, so that they interlock with the threads of the reinforcing bars. Finally, the locking sleeves with inner conical surfaces are fastened from both ends to complete the connection of the reinforcing bars.

[0078] After the above construction is completed, if Figure 10-13 As shown, the second supporting structure, longitudinal beam 16, and waist beam 17 are dismantled sequentially from bottom to top, and scaffolding 18 is erected in the expansion area. The erected scaffolding 18 should be connected to the scaffolding 18 in the main structure 3 of the starting station to form a whole. Simultaneously, the side walls and floor slabs 3-1 of the main structure 22 of the expansion station are constructed from bottom to top. After the construction of the main structure 22 of the expansion station is completed, all scaffolding 18 and the first supporting member 14 are dismantled, and the soil above the top slab of the expansion area is backfilled, thus realizing the expansion of the station.

[0079] S6: Construct the shield tunnel section 23 connecting the main structure 22 of the outer station and the main structure 20 of the receiving station, and make the shield tunnel section 23 avoid the accident tunnel 1. The shield tunneling is carried out by the shield machine 100. After completion, the shield machine is removed, thereby completing the overall alignment repair of the accident shield tunnel.

[0080] It should be understood that expressions such as "comprising" and "may include" as used in this application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In this application, terms such as "comprising" and / or "having" may be interpreted as indicating a specific characteristic, number, operation, constituent element, component, or combination thereof, but should not be interpreted as excluding the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof.

[0081] It should be understood that the terms “center,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0082] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0083] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0084] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for overall alignment adjustment and repair of a shield tunnel damaged in an accident, characterized in that, Includes the following steps: S1: Drill a hole from the ground down and fill the inside of the accident tunnel (1) with grout along the hole; S2: Set up a sealing gate (2) at the end of the accident tunnel (1) and fill the accident tunnel (1) with secondary grouting from the main structure (3) of the starting station; S3: Reinforce the main structure of the starting station (3), construct the outer station enclosure structure (6), connect the outer station enclosure structure (6) with the starting station enclosure structure (4) to form an outer area; S4: Excavate the foundation pit and partially break the retaining structure (4) of the starting station and the main structure (3) of the starting station, so that the main structure (3) of the starting station in the outer expansion area is connected to the retaining structure (6) of the outer expansion station; S5: Construct the main structure (22) of the extended station and connect the main structure (22) of the extended station with the main structure (3) of the originating station; S6: Construct the shield tunnel section (23) connecting the main structure (22) of the outer station and the main structure (20) of the receiving station, and make the shield tunnel section (23) avoid the accident tunnel (1), thereby completing the overall alignment repair of the accident shield tunnel; Step S3 includes the following sub-steps: S301: Arrange structural cutting lines (5) on the main structure (3) of the starting station; S302: A reinforcing structure is set on one side of the structural cutting line (5) to reinforce each floor slab (3-1) of the main structure (3) of the starting station; S303: Construct the outer station enclosure structure (6) on the opposite side of the structural cutting line (5), construct the supporting enclosure structure on the top of the main structure (3) of the starting station, and connect the outer station enclosure structure (6) with the starting station enclosure structure (4). S304: Construct a horizontal support structure connecting the top enclosure structure, the starting station enclosure structure (4), and the outer station enclosure structure (6).

2. The method for overall alignment repair of an accident-damaged shield tunnel as described in claim 1, characterized in that, In step S302, the reinforcement structure is arranged in multiple groups from bottom to top. Each group of reinforcement structures includes a frame column (7) and a support beam (8) set on the top of the frame column (7). The lower end of the frame column (7) is fixed to one of the floor slabs (3-1), and the upper end of the support beam (8) is attached to another floor slab (3-1).

3. The method for overall alignment repair of an accident-damaged shield tunnel as described in claim 1, characterized in that, In step S303, the supporting enclosure structure includes: a retaining wall (9) arranged on the upper end of the main structure (3) of the starting station, and a capping beam (10) arranged on the upper end of the retaining wall (9), and the retaining wall (9) and the capping beam (10) are both located directly above the reinforcement structure.

4. The method for overall alignment and repair of an accident-damaged shield tunnel as described in claim 3, characterized in that, In step S304, the constructed horizontal support structure includes a structural plate (13) and a first support member (14). The structural plate (13) and the first support member (14) are respectively located on both sides of the capping beam (10) and are both connected to the capping beam (10). One of the structural plate (13) and the first support member (14) is connected to the outer station enclosure structure (6), and the other one is connected to the starting station enclosure structure (4).

5. The method for overall alignment repair of an accident-damaged shield tunnel as described in any one of claims 1-4, characterized in that, In step S3, the area below the subbase (19) is reinforced before the construction of the outer station enclosure structure (6).

6. The method for overall alignment repair of an accident-damaged shield tunnel as described in any one of claims 1-4, characterized in that, In step S3, when constructing the outer station enclosure structure (6), high-pressure jet grouting is performed at the connection between the outer station enclosure structure (6) and the starting station enclosure structure (4).

7. The method for overall alignment repair of an accident-damaged shield tunnel as described in any one of claims 2-4, characterized in that, In step S4, the excavation and demolition of the foundation pit are carried out layer by layer from top to bottom. The demolition area is the main structure (3) of the starting station and the retaining structure (4) of the starting station on the side of the structural cutting line (5) close to the outer station retaining structure (6). As the soil is excavated, the second support structure is set layer by layer. The second support structure supports the outer station retaining structure (6) diagonally on the uncut area of ​​the main structure (3) of the starting station.

8. The method for overall alignment repair of an accident-damaged shield tunnel as described in claim 7, characterized in that, In step S5, when constructing the main structure (22) of the extended station, the foundation layer (19) is constructed first, and the bottom plate of the main structure (22) of the extended station is connected to the main structure (3) of the starting station. Then, the second support structure is removed layer by layer from bottom to top, and the main structure (22) of the extended station is constructed in the extended area.

9. The method for overall alignment repair of an accident-damaged shield tunnel as described in claim 8, characterized in that, In step S5, when constructing the main structure (22) of the extended station, the steel bars of the bottom plate of the main structure (22) of the extended station are connected to the steel bars of the main structure (3) of the starting station. The connection method is: split sleeve connection, straight thread sleeve connection or welding.

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