Temporary inverted arch and lap joint plate structure capable of rapidly forming TBM tunnel walking and construction method

Abstract

The invention discloses a temporary inverted arch and lap joint plate structure capable of rapidly forming TBM tunnel walking and a construction method, and belongs to the technical field of tunnels and underground engineering, and the temporary inverted arch and lap joint plate structure comprises an assembly type temporary inverted arch unit and an inverted arch lap joint plate assembly; the fabricated temporary inverted arch unit is formed by splicing a plurality of modules, and the modules are provided with front-back connecting holes, left-right connecting holes, telescopic supporting rod pieces, anti-skid supporting legs and reinforcing supports. A sliding groove in the longitudinal direction of the tunnel is preset in the top of the fabricated temporary inverted arch unit; the inverted arch lap joint plate assembly comprises an inverted arch lap joint plate, a sliding device and a connecting piece, the sliding device is installed in the sliding groove in a matched mode, and the inverted arch lap joint plate and the sliding device are fixed through the connecting piece. According to the temporary inverted arch and lap joint plate structure capable of rapidly forming TBM tunnel walking and the construction method, the problems that TBM tunneling, primary supporting and inverted arch construction are poor in synchronism and low in construction efficiency are solved, and the purposes that the structure is detachable and reusable, the construction process is simplified, and the cost is reduced are achieved.

Description

Technical Field

[0001] This invention relates to the field of tunnel and underground engineering technology, and in particular to a temporary invert arch and lap plate structure and construction method for rapidly forming a TBM tunnel. Background Technology

[0002] Currently, in hard rock tunnel construction, TBM (Tunnel Boring Machine) full-face tunneling technology is widely used due to its significantly faster excavation speed compared to traditional drill-and-blast methods. However, the TBM excavation speed is not matched with the construction speed of initial support and secondary lining (especially the invert arch), causing the distance from the tunnel face to the secondary lining to easily exceed the safe range. Furthermore, the material transportation channels required for initial construction interfere with the invert arch construction, affecting the continuity and efficiency of construction. Existing temporary invert arch structures suffer from problems such as inconvenient adjustment of lap plates, time-consuming formwork support, and insufficient installation stability, failing to meet the requirements of efficient TBM tunnel construction. Summary of the Invention

[0003] The purpose of this invention is to provide a temporary invert arch and lap plate structure and construction method for TBM tunnel travel that can be quickly formed, solving the problems of poor synchronization between TBM excavation and initial support and invert arch construction, obstructed material transportation, and low construction efficiency, and achieving the goals of detachable and reusable structure, simplified construction process, and reduced cost.

[0004] To achieve the above objectives, the present invention provides a temporary invert arch and overlapping plate structure for rapid TBM tunnel movement, comprising a prefabricated temporary invert arch unit and an invert arch overlapping plate assembly; the prefabricated temporary invert arch unit is composed of several modules spliced ​​together, and each module is provided with front and rear connecting holes, left and right connecting holes, telescopic support rods, anti-slip legs, and reinforcing supports; the top of the prefabricated temporary invert arch unit is pre-set with a sliding groove along the longitudinal direction of the tunnel; the invert arch overlapping plate assembly includes an invert arch overlapping plate, a sliding device, and a connector, the sliding device being adapted and installed in the sliding groove, and the connector fixing the invert arch overlapping plate to the sliding device, thereby enabling the invert arch overlapping plate to slide along the sliding groove.

[0005] Preferably, the modules include a first module, a second module, a third module, and a fourth module; The second module includes several second anti-slip legs. The front and rear sides of the second anti-slip legs are provided with second front and rear connecting round holes, and the left and right sides of the second anti-slip legs are provided with second left and right connecting square holes. The several second anti-slip legs are provided with second reinforcing supports, and the second anti-slip legs are provided with second telescopic support rods.

[0006] Preferably, the fourth module includes a plurality of fourth anti-slip legs, the front and rear sides of the fourth anti-slip legs are provided with fourth front and rear connecting round holes, the left and right sides of the fourth anti-slip legs are provided with fourth left and right connecting square holes, the plurality of fourth anti-slip legs are provided with fourth reinforcing supports, and the fourth anti-slip legs are provided with fourth telescopic support rods.

[0007] Preferably, the telescopic support rod has a telescopic stroke of 2m, which is used for template positioning and limiting during the secondary pouring of the invert arch. The bottom of the anti-slip support leg is provided with an anti-slip pad, and the anti-slip support leg is fixedly connected to the frame structure of the module to ensure the stability of the support.

[0008] Preferably, the modules of the prefabricated temporary inverted arch unit are detachably connected by bolts passing through the front and rear connecting holes and the left and right connecting holes; the sliding device is a roller type structure and fits against the inner wall of the sliding groove to reduce sliding resistance; the surface of the inverted arch overlapping plate is provided with anti-slip texture.

[0009] This invention also provides a construction method for rapidly forming a temporary invert arch and overlapping slab structure for TBM tunnel movement, comprising the following steps: After S1 and TBM tunneling, the prefabricated temporary invert arch modules are transported to the initial support completion area, the modules are assembled and their positions are adjusted; S2. Extend the temporary invert arch unit to the preset length by connecting the subsequent modules with bolts, and perform a tightness test after bolt connection; S3. Install the sliding device and connectors, fix the inverted arch lap plate and adjust the levelness; S4. Material transport machinery transports construction materials via the inverted arch lap joint plate; S5. During the secondary pouring of the invert arch, telescopic support rods are used as template positioning / limiting devices. After the construction of S6, the invert arch lining and road surface is completed, the invert arch lap plate is pushed forward along the sliding groove, the rear temporary invert arch module is removed and reassembled to the front initial support area.

[0010] Preferably, in step S1, the base surface of the initial support area needs to be specially cleaned before the module is assembled: first, use a high-pressure air gun to blow away loose debris such as floating dust and rock chips from the base surface, and then manually scrape away the mud cake, rebound material and protruding hard blocks attached to the base surface to ensure that the flatness error of the base surface does not exceed 8mm; after cleaning, check the fit between the anti-slip legs of the prefabricated temporary arch module and the base surface point by point. The fit gap needs to be controlled within 2mm to prevent uneven force on the module caused by local suspension. At the same time, a waterproof sealing strip is laid on the edge of the fit surface to prevent construction wastewater from seeping into the gaps of the base surface.

[0011] Preferably, in step S3, after the invert arch lap plate is installed, a precision level is used to check the levelness of the entire section. The distance between the test points does not exceed 50cm, and each test point is measured three times consecutively and the average value is taken. The overall levelness error does not exceed 3mm / 2m, and the elevation difference between adjacent test points does not exceed 1mm. If the test finds that the error exceeds the tolerance, it is corrected by adjusting the fine-tuning support at the bottom of the sliding device. After correction, it is checked again until the requirements are met. At the same time, the gap width at the splicing of the lap plate is checked. The splicing gap does not exceed 2mm, and wear-resistant elastic sealing material is required to fill the gap to prevent bumps, abnormal noises or debris jamming when the transport machinery passes through, and to ensure that the transport machinery passes smoothly under the rated load without deviation or excessive vibration.

[0012] Preferably, in step S5, before installing the telescopic support rods, the theoretical extension length of the adjustable support rods needs to be determined based on the design thickness of the secondary casting of the invert arch, the type of template, and the support spacing. During installation, the template design elevation is used as a reference, and precise adjustment is made through the scale markings and fine-tuning knobs on the adjustable support rods. During the adjustment process, a laser rangefinder is used to monitor the extension length in real time, and the final extension length error does not exceed 5mm. After adjustment, the adjustable support rods are locked and fixed. The locking mechanism must have an anti-loosening function. At the same time, during the casting process, a dedicated person is arranged to inspect and monitor the extension and contraction status of the rods in real time. If any abnormality is found, timely adjustment is made to ensure that the template is firmly positioned and accurately limited, and to avoid template deformation or displacement during the casting process.

[0013] Preferably, in step S6, the dismantled temporary invert arch modules need to be processed according to the "cleaning-inspection-repair-maintenance-labeling" process: First, use a high-pressure water gun with a neutral detergent to wash away concrete residue and oil stains on the module surface. If necessary, use a wire brush to clean stubborn attachments to ensure that there are no obvious stains on the module surface; then check the structural integrity of the module, focusing on key parts such as bolt holes, splicing surfaces, and anti-slip legs. If there is deformation, wear, or cracks, it needs to be repaired by mechanical correction, welding, or replacement of parts. The performance of the repaired module must meet the original design requirements; after the repair is completed, apply rust-preventive lubricant and anti-corrosion coating to the splicing surfaces, bolt holes, and other easily worn parts of the module to extend the service life of the module; finally, number and label the qualified modules, indicating the module specifications, reuse times, and next maintenance time, and stack them in a dry and ventilated storage area, with a stacking height of no more than 3 layers. A moisture-proof mat should be placed at the bottom to prevent the modules from getting damp and rusting. Through the above reuse process, the temporary invert arch modules can be reused no less than 30 times, effectively reducing the construction material loss rate and saving construction costs.

[0014] Therefore, the present invention employs the aforementioned temporary invert arch and overlapping plate structure and construction method for rapidly forming a TBM tunnel, with the following technical advantages: 1) Temporary invert arches can be disassembled and reused, reducing construction costs; 2) The overlapping plate slides along the preset sliding groove, eliminating the need for repeated spacing adjustments and improving operational convenience; 3) The telescopic support rods also serve as formwork supports, shortening the construction time of the invert arch; 4) The material transportation channel and the invert construction do not interfere with each other, so that the initial support and invert construction can be carried out simultaneously; 5) High-friction, anti-slip outriggers and frame structure ensure installation stability and improve construction safety.

[0015] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an embodiment of the temporary invert arch and lap plate structure for rapid TBM tunnel travel according to the present invention. Figure 2 This is a schematic diagram of a temporary invert arch and overlapping plate structure that can quickly form a TBM tunnel for travel, as described in this invention, inside a TBM tunnel. Figure 3 This is an exploded view of the temporary inverted arch and overlapping plate of an embodiment of the present invention, which can quickly form a temporary inverted arch and overlapping plate structure for TBM tunnel travel. Figure 4 This is a structural diagram of the fourth module of an embodiment of the temporary invert arch and lap plate structure for rapid TBM tunnel travel according to the present invention. Figure 5 This is a second module structure diagram of an embodiment of the temporary invert arch and lap plate structure for rapid TBM tunnel travel according to the present invention; Figure 6 This is a bottom structural diagram of the inverted arch and overlapping plate of an embodiment of the present invention, which can quickly form a temporary inverted arch and overlapping plate structure for TBM tunnel travel.

[0017] Figure Labels 1. Secondary structure of the invert arch already constructed; 2. First module; 3. Invert arch lap plate; 4. Fourth module; 5. Second module; 6. Third module; 7. Sliding groove; 8. TBM tunnel initial support; 9. Fourth left and right connecting square holes; 10. Fourth reinforcing support; 11. Fourth front and rear connecting round holes; 12. Fourth telescopic support rod; 13. Fourth anti-slip outrigger; 14. Second front and rear connecting round holes; 15. Second telescopic support rod; 16. Second anti-slip outrigger; 17. Second left and right connecting square holes; 18. Second reinforcing support; 19. Connector; 20. Sliding device. Detailed Implementation

[0018] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0020] Example 1 This embodiment is applied to a hard rock TBM double-support tunnel construction project. The tunnel diameter is 8.5m, the TBM excavation speed is about 6-8m / day, the initial support uses shotcrete and anchor support, and the secondary lining invert is cast with C35 concrete. This embodiment uses the temporary invert and overlapping plate structure and construction method described in this invention to solve the problem of synchronizing TBM excavation with the construction of the initial support and invert, ensuring construction efficiency and safety.

[0021] like Figure 1-6 As shown, this invention provides a temporary invert arch and overlapping plate structure for rapid TBM tunnel movement, including a prefabricated temporary invert arch unit and an invert arch overlapping plate assembly. The prefabricated temporary invert arch unit is composed of several modules spliced ​​together. Each module is provided with front and rear connecting holes, left and right connecting holes, telescopic support rods, anti-slip legs, and reinforcing supports. The top of the prefabricated temporary invert arch unit has a pre-set sliding groove 7 along the longitudinal direction of the tunnel. The invert arch overlapping plate assembly includes an invert arch overlapping plate 3, a sliding device 20, and a connector 19. The sliding device 20 is adapted to be installed in the sliding groove 7, and the connector 19 fixes the invert arch overlapping plate 3 to the sliding device 20, so that the invert arch overlapping plate 3 slides along the sliding groove 7. After the TBM tunnel primary support 8 is constructed, the invert arch overlapping plate 3 of this structure is installed on the secondary structure 1 of the constructed invert arch.

[0022] I. Preparation of structural components: (a) Prefabricated temporary invert arch unit module: Several modules: including module 2, module 5, module 6, and module 4. Each module is 1.2m wide and 2.5m long. They are made of Q355B steel and welded together. The frame structure has a wall thickness of 12mm.

[0023] Module 2, Part 5 (as shown) Figure 5As shown): Equipped with six second anti-slip legs 16, with rubber anti-slip pads installed at the bottom of the second anti-slip legs 16, the anti-slip pads being 20mm thick; second front and rear connecting round holes 14 are opened on the front and rear sides of the second anti-slip legs 16, and second left and right connecting square holes 17 are opened on the left and right sides of the second anti-slip legs 16; two second reinforcing supports 18 are welded in the middle of the module; second telescopic support rods 15 are installed on the top of the second anti-slip legs 16, with a telescopic stroke of 0-2m, and have their own scale markings (accuracy 1mm) and anti-loosening locking mechanism.

[0024] Module 4 (e.g.) Figure 4 As shown): The structure is symmetrical to the second module 5, and is equipped with a fourth anti-slip support leg 13. The bottom of the fourth anti-slip support leg 13 is provided with an anti-slip pad. The front and rear sides of the fourth anti-slip support leg 13 are provided with fourth front and rear connecting round holes 11. The left and right sides of the fourth anti-slip support leg 13 are provided with fourth left and right connecting square holes 9. Two fourth reinforcing supports 10 are welded in the middle of the module. The top of the fourth anti-slip support leg 13 is equipped with a fourth telescopic support rod 12, and the performance parameters are the same as those of the second telescopic support rod 15.

[0025] Module 2 and Module 6: As auxiliary modules, their structures are adapted to the intermediate modules, and they are equipped with corresponding connection holes, anti-slip legs and retractable support rods. Their dimensions match those of Module 5 and Module 4.

[0026] (ii) Inverted arch lap joint plate assembly (such as...) Figure 6 (as shown) Invert arch lap plate 3: It is made of patterned steel plate (16mm thick) welded with steel frame, with a length of 8m and a width that matches the transverse span of the tunnel (7.8m). The surface is pressed with anti-slip texture (3mm raised height), and a 2mm expansion joint is reserved at the splice.

[0027] Sliding device 20: adopts a roller structure, each device is equipped with 4 high-strength rollers (bearing capacity ≥5t), the gap between the rollers and the inner wall of the sliding groove 7 is ≤1mm, and the surface is coated with lithium-based grease.

[0028] Connector 19: High-strength bolts (M24×80) are used with spring washers and flat washers. The material is 40Cr and the tensile strength is ≥800MPa.

[0029] (III) Auxiliary components: Includes M24 high-strength bolts (with matching nuts and spring washers), waterproof sealing strips (water-swellable type, 20mm wide), neutral detergent, rust-preventive lubricant, and anti-corrosion coating (epoxy zinc-rich primer + polyurethane topcoat), etc.

[0030] II. Implementation of Construction Steps: S1: Preparation and cleaning of the base surface before module assembly; After the TBM tunneling completes a section of initial support (10m in length), the tunneling is stopped and dangerous rocks around the working face are cleared to ensure the safety of the work area.

[0031] Base surface cleaning: Use a high-pressure air gun (0.6MPa) to blow away the floating dust and rock debris on the base surface (invert arch part) of the initial support area; manually use scraping tools to remove the mud cake, rebound material and protruding hard blocks attached to the base surface; use a 2m straightedge to check the flatness of the base surface, and control the error within 8mm. After cleaning, check the fit between the module's anti-slip legs and the base surface point by point, and use a feeler gauge to measure the fit gap to ensure it is ≤2mm; lay a waterproof sealing strip on the edge of the fit surface, with the sealing strip continuously laid around the leg, and the joints are overlapped (overlap length 50mm).

[0032] The first module 2, the second module 5, the third module 6, and the fourth module 4 are transported to the initial support completion area using the TBM-equipped transport equipment and placed in the installation order (the second and third modules are placed in the middle first, and the first and fourth modules are placed on both sides).

[0033] S2: Assembly of prefabricated temporary inverted arch units; First, assemble the middle module: hoist the second module 5 and the third module 6 to the predetermined position, adjust the level of the module (use a level to check, the error ≤3mm / 2m), and correct the height by adjusting the fine bolts at the bottom of the outriggers.

[0034] Connecting the intermediate module: M24 high-strength bolts are used to pass through the second left and right connecting square holes 17 and the fourth left and right connecting square holes 9 to fix the second module 5 and the third module 6. The bolt tightening torque is controlled at 450 N·m, and a torque wrench is used to check after tightening.

[0035] Assemble the side modules: Hoist the first module 2 and the fourth module 4 to both sides of the middle module, and connect them to the middle module with bolts through the front and rear connecting round holes and the left and right connecting square holes to ensure that the module splicing surfaces fit tightly (gap ≤ 2mm).

[0036] Extended assembly: Transport subsequent modules and connect the new modules to the positioned modules with bolts through the front and rear connecting round holes, gradually extending the temporary invert arch unit to the preset length (10m in this embodiment). After every 3 modules are assembled, the overall levelness and straightness are checked, and the straightness error is ≤5mm / 10m.

[0037] S3: Installation of inverted arch lap joint plate assembly; Installation of sliding device: Evenly embed the sliding device 20 into the sliding groove 7 at the top of the temporary invert arch unit (1m spacing) to ensure that the rollers rotate flexibly without jamming.

[0038] Fixing connector 19: Fix connector 19 to sliding device 20 with M24 bolts. The bolt tightening torque is 350 N·m. After tightening, check the verticality of connector 19 (error ≤ 2 mm).

[0039] Installation of overlapping plate: Hoist the overlapping plate 3 of the invert arch to the top of the connector 19, adjust the position of the overlapping plate so that one end of the overlapping plate overlaps on the secondary structure 1 of the invert arch that has been constructed (overlap length 500mm), and the other end overlaps on the temporary invert arch unit.

[0040] Levelness detection and correction: A precision level (accuracy 0.02mm / m) is used to conduct full-section detection of the invert arch lap plate 3. The detection point spacing is 50cm. Each detection point is measured 3 times and the average value is taken. The overall levelness error is ≤3mm / 2m and the elevation difference between adjacent detection points is ≤1mm. For the parts that exceed the tolerance, the fine adjustment support at the bottom of the sliding device 20 is adjusted for correction. After correction, the levelness is checked again.

[0041] Treatment of splicing gaps: Fill the splicing joints of the arch lap plate 3 with wear-resistant elastic sealant (polyurethane sealant) to ensure that the gap width is ≤2mm, the sealant is tightly attached to the plate, and there are no bubbles or cracks.

[0042] S4: Material transportation; Material transport machinery (tunnel-specific explosion-proof loader, 5t load capacity) travels through the invert arch lap plate 3 to the front end of the temporary invert arch unit to unload the anchor bolts (Φ22 threaded steel), shotcrete (dry mix), steel mesh and other materials required for the initial support, as well as the cutting tools, lubricating oil and other accessories required for TBM excavation.

[0043] During transportation, a dedicated person will monitor the deformation of the invert arch lap plate 3 and the status of the sliding device 20. If the vibration exceeds the standard (acceleration > 0.3g) or the lap plate makes abnormal noise, transportation will be stopped immediately and the equipment will be inspected and adjusted.

[0044] S5: Formwork support for secondary pouring of the inverted arch; Template installation: Lay the secondary pouring template for the invert arch (steel template, 6mm thick), and adjust the template position according to the design elevation.

[0045] Adjustment of support rods: Based on the template design elevation (+0.5m) and pouring thickness (30cm), determine the theoretical extension length (80cm) of the telescopic support rods; adjust the extension length using the fine-tuning knobs on the support rods, and monitor the adjustment process in real time using a laser rangefinder to ensure that the extension length error is ≤5mm; after adjustment, activate the locking mechanism to fix the support rods, and use double nuts for locking.

[0046] Template reinforcement: Each template support point corresponds to one telescopic support rod with a support spacing of 80cm to ensure uniform stress on the template; before pouring, check the verticality, flatness and firmness of the template, with verticality error ≤3mm / m and flatness error ≤5mm / 2m.

[0047] Monitoring during the pouring process: When pouring C35 concrete, a dedicated person shall inspect the status of the telescopic support rods every 30 minutes to monitor whether the rods are loose or expand and contract. If any abnormality is found, the locking mechanism shall be adjusted or additional support shall be provided in a timely manner.

[0048] S6: Structural reuse; After the secondary lining concrete of the invert arch has been cured for 7 days (when the strength reaches 75% of the design strength), the formwork is removed and the surface of the invert arch is cleaned of debris.

[0049] Forward movement of the lap plate: The invert arch lap plate 3 is pushed forward along the sliding groove 7 by the traction equipment (manual hoist, traction force 5t) to move towards the front of the tunnel. The moving speed is controlled at 0.5m / min to ensure that the moving process is smooth and there is no collision with the module.

[0050] Temporary invert arch module dismantling: Remove the connecting bolts between the modules one by one from the rear, and use hoisting equipment to lift the modules away one by one. The dismantling order is the reverse of the assembly order (dismantle the side modules first, then the middle module).

[0051] Module reuse processing: Cleaning: Use a high-pressure water gun (0.8MPa) with a neutral detergent to rinse the concrete residue and oil stains on the module surface. Use a wire brush to clean stubborn attachments to ensure that there are no obvious stains on the module surface.

[0052] Inspection: Visual inspection combined with ultrasonic testing is used to check key parts such as bolt holes, splicing surfaces, and anti-slip legs. If deformation (deformation > 3mm), wear (wall thickness reduction > 1mm), or cracks (length > 50mm) are found, mechanical correction, welding, or replacement of parts are used for repair. The performance after repair meets the original design requirements.

[0053] Maintenance: Apply rust-preventive lubricant to easily worn areas such as module splicing surfaces and bolt holes, and apply epoxy zinc-rich primer (80μm thick) and polyurethane topcoat (40μm thick) to the surface of the frame structure.

[0054] Labeling: Number qualified modules (e.g., "Module 2-01"), indicating specifications, number of reuses and next maintenance time, and stack them in a dry and ventilated storage area, with a stacking height of ≤3 layers and a moisture-proof mat at the bottom.

[0055] Reuse: The maintained module is transferred to the newly completed initial support area and the construction process of S1-S5 is repeated. In this embodiment, the module is reused 32 times without performance degradation.

[0056] III. Implementation Results: Construction efficiency: TBM tunneling and initial support and invert construction can be carried out simultaneously, reducing the invert construction time from 4 days / section in the traditional method to 2 days / section, improving construction efficiency by 50%.

[0057] Cost control: The temporary invert arch module can be reused ≥30 times, and the material loss rate is reduced to below 3%. Compared with the traditional one-time temporary invert arch, the construction cost is reduced by 40%.

[0058] Construction safety: The material transport channel for the initial support is isolated from the invert arch construction area, with no mutual interference. The distance from the working face to the secondary lining is always controlled within a safe range (≤50m), and no safety accidents have occurred.

[0059] Construction quality: The flatness error of the concrete lining of the invert arch is ≤5mm / 2m, the strength qualification rate is 100%, the levelness of the lap plate meets the requirements for smooth passage of transport machinery, and there are no deviations or excessive vibrations.

[0060] Therefore, the present invention adopts the above-mentioned temporary invert arch and overlapping plate structure and construction method that can quickly form TBM tunnel travel, which solves the problems of poor synchronization between TBM excavation and initial support and invert arch construction and low construction efficiency, and achieves the goals of detachable and reusable structure, simplified construction process and reduced cost.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A temporary invert arch and overlapping plate structure for rapid TBM tunnel travel, characterized in that: The system includes a prefabricated temporary invert arch unit and an invert arch overlap plate assembly. The prefabricated temporary invert arch unit is composed of several modules spliced ​​together. Each module is provided with front and rear connection holes, left and right connection holes, telescopic support rods, anti-slip legs, and reinforcing supports. The top of the prefabricated temporary invert arch unit has a pre-set sliding groove along the longitudinal direction of the tunnel. The invert arch overlap plate assembly includes an invert arch overlap plate, a sliding device, and a connector. The sliding device is adapted to be installed in the sliding groove, and the connector fixes the invert arch overlap plate to the sliding device.

2. The temporary invert arch and overlapping plate structure for rapid TBM tunnel travel according to claim 1, characterized in that: Several modules include Module 1, Module 2, Module 3, and Module 4; The second module includes several second anti-slip legs. The front and rear sides of the second anti-slip legs are provided with second front and rear connecting round holes, and the left and right sides of the second anti-slip legs are provided with second left and right connecting square holes. The several second anti-slip legs are provided with second reinforcing supports, and the second anti-slip legs are provided with second telescopic support rods.

3. The temporary invert arch and overlapping plate structure for rapid TBM tunnel travel according to claim 2, characterized in that: The fourth module includes several fourth anti-slip legs. The front and rear sides of the fourth anti-slip legs are provided with fourth front and rear connecting round holes, and the left and right sides of the fourth anti-slip legs are provided with fourth left and right connecting square holes. The several fourth anti-slip legs are provided with fourth reinforcing supports, and the fourth anti-slip legs are provided with fourth telescopic support rods.

4. The temporary invert arch and overlapping plate structure for rapid TBM tunnel travel according to claim 1, characterized in that: The telescopic support rod has a telescopic stroke of 2m, and the anti-slip leg is provided with an anti-slip pad at the bottom. The anti-slip leg is fixedly connected to the frame structure of the module.

5. The temporary invert arch and overlapping plate structure for rapid TBM tunnel travel according to claim 1, characterized in that: The prefabricated temporary inverted arch unit is detachably connected to several modules by bolts passing through the front and rear connecting holes and the left and right connecting holes; the sliding device is a roller type structure and fits against the inner wall of the sliding groove, and the surface of the inverted arch overlapping plate is provided with anti-slip texture.

6. A construction method for a temporary invert arch and overlapping plate structure for rapid TBM tunnel travel, based on any one of claims 1-5, characterized in that, Includes the following steps: After S1 and TBM tunneling, the prefabricated temporary invert arch modules are transported to the initial support completion area, the modules are assembled and their positions are adjusted; S2. Extend the temporary invert arch unit to the preset length by connecting the subsequent modules with bolts, and perform a tightness test after bolt connection; S3. Install the sliding device and connectors, fix the inverted arch lap plate and adjust the levelness; S4. Material transport machinery transports construction materials via the inverted arch lap joint plate; S5. During the secondary pouring of the invert arch, telescopic support rods are used as template positioning / limiting devices. After the construction of S6, the invert arch lining and road surface is completed, the invert arch lap plate is pushed forward along the sliding groove, the rear temporary invert arch module is removed and reassembled to the front initial support area.

7. The construction method for a temporary invert arch and overlapping plate structure for rapid TBM tunnel travel according to claim 6, characterized in that, In step S1, before assembling the module, the base surface of the initial support area needs to be cleaned, and the fit between the anti-slip legs and the base surface needs to be checked.

8. A construction method for rapidly forming a temporary invert arch and overlapping slab structure for TBM tunnel travel, as described in claim 6, is characterized in that... In step S3, after the invert arch lap plate is installed, a precision level is used to check the levelness of the entire section. The distance between monitoring points does not exceed 50cm, and the average value is taken for each monitoring point after 3 consecutive tests.

9. A construction method for rapidly forming a temporary invert arch and overlapping slab structure for TBM tunnel travel according to claim 6, characterized in that, In step S5, the extension length of the telescopic support rod is precisely adjusted according to the design thickness of the secondary casting of the invert arch, the height of the template, and the support spacing, with an error not exceeding 5mm.

10. A construction method for rapidly forming a temporary invert arch and overlapping plate structure for TBM tunnel travel according to claim 6, characterized in that, In step S6, the dismantled temporary invert arch module needs to be processed according to the process of cleaning, inspection, repair, maintenance and labeling.

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