Composite lining arch construction structure and construction method

Abstract

The present application relates to a composite lining arch construction structure and a construction method thereof. The scheme includes: an assembled rail arch frame, which is embedded and installed on the secondary lining by planting reinforcement bars. The feet of the assembled rail arch frame are locked and limited by locking anchor rods and U-shaped steel bars, and the end steel plate at the bottom of the assembled rail arch frame is connected to the embedded parts in the concrete base by hexagonal bolts; a steel frame beam is arranged in the pavement structure layer to reinforce the pavement structure layer; a ribbed formwork is suspended and supported by anchor rods, and the gap between the ribbed formwork and the secondary lining is poured with concrete to seal and bury the assembled rail arch frame to form a composite reinforced lining; a longitudinal and transverse planting reinforcement network is arranged in the space after the cavity of the composite reinforced lining is chiseled out; a perforated shaped steel plate is used to seal the cavity by hanging anchor rods and can be filled with concrete grouting liquid through a grouting pipe. This effectively improves the construction quality of the lining arch.

Description

Technical Field

[0001] The present application relates to the technical field of construction engineering, and in particular to a composite lining arch construction structure and a construction method thereof. Background Art

[0002] my country has a vast territory, and the geological conditions of tunnels passing through mountains are complex and changeable. Affected by factors such as design concepts, construction level, and operating environment, as the operation time increases, some lining structures have insufficient bearing capacity and gradually develop serious defects such as deformation, cracking, misalignment, and falling blocks, which affect the use function and operational safety of the tunnel to varying degrees, and urgently need to be reinforced and treated.

[0003] At present, the main methods of lining reinforcement include bonding fiber composite materials, bonding steel plates (strips), sprayed concrete, embedded steel frames, anchor rods, and sleeve arches. Among them, the sleeve arch is an arched concrete structure added along the outer surface of the original lining, which shares the external load with the original lining. It can significantly improve the strength, stiffness, and stability of the lining structure, improve the bearing capacity of the lining structure, and achieve the most ideal reinforcement effect. However, there are several problems in the reinforcement process of the sleeve arch: (1) The sleeve arch frame is easy to shift and has poor integrity; (2) In order to meet the requirements of steel frame erection, the sleeve lining often intrudes into the tunnel limit, affecting the transition construction of communications, contact line protection, power, etc.; (3) During the construction of the sleeve arch, the tunnel floor will experience cracks in the road surface, deformation and warping of the arch foot, and bulging of the floor, resulting in insufficient bearing capacity of the floor, which seriously affects traffic; (4) After the sleeve arch is poured, there are local cavities and hollows, and there is often a lack of effective repair measures, which affects the construction quality of the lining sleeve arch.

[0004] Therefore, there is an urgent need for a composite lining sleeve arch construction structure and a construction method thereof to solve the problems existing in the prior art. Summary of the Invention

[0005] The purpose of this application is to provide a composite lining arch construction structure and a construction method thereof in order to address the above-mentioned problems existing in the prior art.

[0006] To achieve the above application objectives, this application adopts the following technical solution: a composite lining arch, which is used to reinforce areas where surrounding rock is broken, where the initial support thickness is too thin, where the waterproof layer leaks, and where the secondary lining is cracked, including:

[0007] The assembled rail arch is embedded in the secondary lining by planting steel bars. The feet of the assembled rail arch are locked and limited by locking anchor rods and U-shaped steel bars, and the end steel plate at the bottom of the assembled rail arch is connected to the embedded parts in the concrete base by hexagonal bolts.

[0008] The steel frame beam is arranged in the pavement structure layer and is used to strengthen the pavement structure layer;

[0009] The ribbed formwork is suspended and supported by anchor bolts, and the gap between the ribbed formwork and the secondary lining is poured with concrete to seal and bury the assembled rail arch to form a composite reinforced lining;

[0010] The longitudinal and transverse embedded reinforcement nets are installed in the space after the cavity of the composite reinforced lining is removed;

[0011] The perforated shaped steel plate closes the hole through the anchor rod and can fill the hole by injecting concrete grouting liquid through the grouting pipe.

[0012] Furthermore, an arch groove is opened in the secondary lining, and anchor bars are evenly implanted in the arch groove, so that the assembled rail arch frame can be welded and fixed to the anchor bars after being embedded in the arch groove.

[0013] Furthermore, adjacent assembled rail arches are connected into one by connecting ribs, and after the assembled rail arches are embedded in the arch grooves, the gaps on both sides of the assembled rail arches are fixed by filling the arch grooves with rods.

[0014] Furthermore, anchor bolts are driven along the circumference of the tunnel and into the surrounding rock to a set depth.

[0015] Furthermore, the steel frame beam is assembled by welding longitudinal channel steel, longitudinal steel sections and transverse steel supports, and the longitudinal channel steel is driven into the ground through a grouting conduit and then grouting is used to strengthen and fix it.

[0016] A method for constructing a superimposed lining and arch is provided, which is used to construct the superimposed lining and arch construction structure described above, and specifically comprises the following construction steps:

[0017] S00. Construction preparation: Inspect areas of broken surrounding rock, areas where initial support thickness is too thin, areas where waterproofing layers leak, and areas where secondary linings crack; measure and lay out the cutting line for the arch groove and the placement of anchor bolts; cast the foundation at the designed location and embed connectors within the foundation;

[0018] S10. Driving anchor bolts: Driving anchor bolts into the secondary lining along the arrangement points of the anchor bolts until they penetrate into the surrounding rock;

[0019] S20, Lining Grooving and Rebar Planting: Roughen the secondary lining surface to expose the fresh concrete surface. Use a concrete cutter to cut the secondary lining surface along the measured lines, keeping the width and depth of the cut consistent. Use a pneumatic rock drill to drill along the cutting line to create an arch groove. After the arch groove is chiseled and formed, remove the residue. Plant fixed steel bars at even intervals in the arch groove to form rebar. Ensure that the rebar is firmly connected to the secondary lining through the drilled holes and anchoring agents.

[0020] S30, Arch installation: Before installing the assembled rail arch, self-propelled locking anchor rods are driven into the maximum span and arch foot according to the design drawing. The assembled rail arch is centrally manufactured in the processing yard outside the tunnel.

[0021] After the pre-assembly is qualified, it is transported to the tunnel for segmented assembly. The assembled rail arch frame is embedded in the arch groove and welded to the embedded steel bars in the secondary lining.

[0022] The assembled rail arch foot is welded with an end steel plate, which falls to the bottom of the base and is connected to the embedded parts in the base through hexagonal bolts;

[0023] After the assembled rail arch is correctly adjusted, a U-shaped steel bar is welded to the end of the locking foot anchor rod to lock the assembled rail arch through the U-shaped steel bar;

[0024] The connection between two adjacent assembled rail arches is strengthened by welding connecting bars, and the gap between the assembled rail arches and the arch groove is filled with cast-in-place concrete to form arch groove filling concrete;

[0025] S40, Tie reinforcement and formwork: Install double-layer lining reinforcement, tie the reinforcement mesh to the assembled rail arch, install ribbed formwork below the reinforcement mesh, place the ribbed formwork on the assembled rail arch, and secure the ribbed formwork by installing steel pads at the ends of the anchor bolts;

[0026] S50, pouring concrete: Pour concrete into the gap between the ribbed formwork and the secondary lining, sealing and burying the assembled rail arch with concrete to form a composite reinforced lining, and polishing the inner surface of the composite reinforced lining, and applying a permeable crystalline waterproof coating on the inner surface;

[0027] S60. Install the steel frame beam structure: remove the pavement structure layer and pavement base layer of the damaged section, remove part of the backfill layer of the inverted arch, cut and place platforms on both sides of the inverted arch, and place the steel frame beam structure that has been welded into a whole in advance on the platforms on both sides of the inverted arch. Pass the longitudinal channel steel of the steel frame beam structure through two rows of grouting pipes and drive it into the ground to a set depth. Then inject cement-water glass double liquid slurry into the ground through the grouting pipes for reinforcement.

[0028] Furthermore, the following construction steps are also included:

[0029] S70, Cavity Monitoring: Detect voids in newly constructed composite reinforced linings, mark the void areas, and remove voids where the composite reinforced lining thickness is less than the set thickness;

[0030] S80, Cavity repair: The hollow cavity is treated with rebar planting, and a double-layer longitudinal and transverse rebar planting network is implanted. Hanger anchor rods are driven around the cavity. The lower ends of the hanger anchor rods pass through the perforated shaped steel plate and are fastened with double nuts.

[0031] A grooved pad is set between the double nut and the perforated shaped steel plate, a grouting pipe is inserted into the perforated shaped steel plate, and slightly expansive fine stone concrete is poured through the grouting pipe;

[0032] After the fine stone concrete in the cavity is basically filled, a sealing steel plate is installed at the highest point of the cavity, and grouting holes are reserved on the sealing steel plate. Finally, cement mortar is injected to fill the cavity.

[0033] Furthermore, in step S50, the flatness of the inner surface of the laminated reinforced lining 26 is not greater than 1 / 20.

[0034] Furthermore, in step S70, the cavities with a thickness of less than 20 cm in the composite reinforced lining are manually chiseled out, and the chiseled surface range is ensured to be 5 to 10 cm larger than the cavity range.

[0035] Compared with the prior art, this application has the following beneficial effects:

[0036] 1. The novel composite lining arch structure of the present application is integrated with the original lining, and they bear stress and deform in a coordinated manner, thereby improving the stress conditions of the original structure, making the maximum use of the original structure's bearing capacity, and increasing the safety factor of the lining structure. This is a powerful lining reinforcement method;

[0037] 2. This application uses grooves cut into the secondary lining to embed arch frames, making the thickness of the superimposed arches controllable. When the tunnel headroom is small, the reinforcement can be achieved without intruding into the building limit, thus ensuring the tunnel's service level.

[0038] 3. This application strengthens the arch frame by planting steel bars, and locks the bottom of the arch frame by locking the foot anchor rods and the base, ensuring that the arch frame does not shift and has good integrity;

[0039] 4. This application enhances the horizontal rigidity and bearing capacity of the tunnel invert lining structure by adding a steel frame beam structure to the bottom plate, shortening the construction period and reducing the construction risk;

[0040] 5. After the casing arch is poured, the local voids and hollows are filled with hanging steel plates and concrete poured, which effectively improves the construction quality of the casing arch lining. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is the overall structural diagram of the superimposed lining arch of this application;

[0042] Figure 2 This is the structural diagram of the arch groove for the secondary lining of this application;

[0043] Figure 3 This is the structural diagram of the assembled rail arch frame embedded in the secondary lining arch groove of this application;

[0044] Figure 4 This is a schematic diagram of the secondary lining arch groove filled with concrete in this application;

[0045] Figure 5 This is a structural diagram of the assembled rail arch foot with locking foot anchor rods in this application;

[0046] Figure 6 This is the installation and fixing structure diagram of the assembled rail arch frame arch foot of this application;

[0047] Figure 7 This is a diagram of a reinforced structure composed of a light steel frame and steel pipe grouting added under the tunnel pavement in this application;

[0048] Figure 8 It is the plan view of the layout of the steel frame beams of this application;

[0049] Figure 9 This is the structural diagram of the superimposed lining arch formwork of this application;

[0050] Figure 10 This is a partial enlarged structural diagram of the composite lining arch formwork of this application;

[0051] Figure 11 This is a partial plan view of the composite lining arch formwork of this application;

[0052] Figure 12 This is a partial hollow structure diagram of the superimposed lining arch in this application;

[0053] Figure 13 This is the structural diagram of the composite lining arch cavity with reinforced mesh and hanging steel plate in this application;

[0054] Figure 14 This is the general drawing of the installation of the perforated shaped steel plate for this application;

[0055] Figure 15 It is the construction flow chart of this application.

[0056] Among them: 1. Primary support; 2. Waterproof layer; 3. Secondary lining; 4. Anchoring; 5. Assembled rail arch frame; 6. Connecting reinforcement; 7. Anchor-type anchor rod; 8. Locking anchor rod; 9. U-shaped steel bar; 10. Grouting conduit; 11. Ribbed formwork; 12. End steel plate; 13. Base; 14. Longitudinal channel steel; 15. Longitudinal steel section; 16. Transverse steel support; 17. Surrounding rock; 18. Arch groove; 19. Arch groove filled with concrete; 20. Hexagonal bolt; 21. Inverted arch; 22. Inverted arch backfill layer; 23. Pavement base; 24. Pavement structure layer; 25. Steel pad; 26. Composite reinforced lining; 27. Cavity; 28. Hanger anchor rod; 29. ​​Trough pad; 30. Shaped steel plate with holes; 31. Longitudinal and transverse anchoring net; 32. Grouting pipe; 33. Double screw. DETAILED DESCRIPTION

[0057] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0058] Those skilled in the art should understand that, in the disclosure of this application, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are 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, be constructed and operated in a specific orientation. Therefore, the above terms cannot be understood as limiting this application.

[0059] Example 1

[0060] like Figure 1-4 The structure diagram of the assembled rail arch frame embedded in the secondary lining arch groove is shown. The composite lining arch includes initial support 1, waterproof layer 2, secondary lining 3, embedded steel bar 4, assembled rail arch frame 5, connecting steel bar 6, surrounding rock 17, arch groove 18, arch groove filling concrete 19, etc. The composite lining arch is set to reinforce the defective parts such as the broken surrounding rock 17, the thin thickness of the initial support 1, the leaking part of the waterproof layer 2, and the cracked part of the secondary lining 3; by grooves being opened in the secondary lining 3 and embedded steel bar 4 being set, the arch groove 18 is opened by mechanical cutting in the secondary lining 3, and the embedded steel bar 4 is evenly implanted in the arch groove 18. After the assembled rail arch frame 5 is embedded in the arch groove 18, it is welded with the embedded steel bar 4, and connecting steel bar 6 is set between adjacent assembled rail arch frames 5 to connect them into one. After the assembled rail arch frame 5 is embedded in the arch groove 18, arch groove filling concrete 19 is set in the gaps on both sides to fix it.

[0061] like Figure 1 、 Figure 5 、 Figure 6 As shown, the locking foot anchor rod locks the assembled rail arch frame foot structure diagram, including secondary lining 3, embedded steel bars 4, assembled rail arch frame 5, locking foot anchor rod 8, U-shaped steel bar 9, grouting conduit 10, end steel plate 12, base 13, hexagonal bolt 20, etc. The foot of the assembled rail arch frame 5 is locked and limited by the locking foot anchor rod 8 and the U-shaped steel bar 9. The locking foot anchor rod 8 is set on both sides of the assembled rail arch frame 5 and driven into the secondary lining 3. The end of the locking foot anchor rod 8 is welded with the U-shaped steel bar 9 to lock the foot of the assembled rail arch frame 5. The bottom end of the assembled rail arch frame 5 is provided with an end steel plate 12, and the end steel plate 12 is connected to the embedded parts in the concrete base 13 through the hexagonal bolt 20.

[0062] like Figure 7 、 Figure 8 As shown in the figure, a light steel frame and steel pipe grouting combined reinforcement structure is added under the tunnel pavement, including a grouting conduit 10, a longitudinal channel steel 14, a longitudinal steel section 15, a transverse steel support 16, an inverted arch 21, an inverted arch backfill layer 22, a pavement base layer 23, and a pavement structure layer 24. A steel frame beam structure is set under the pavement structure layer 24 for reinforcement. The steel frame beam is mainly welded into a whole by the longitudinal channel steel 14, the longitudinal steel section 15, and the transverse steel support 16. Shelving platforms are cut on both sides of the inverted arch 21, and the longitudinal channel steel 14 is placed on the shelving platforms. The grouting conduit 10 passes through the longitudinal channel steel 14 and is driven into the ground to a certain depth. Cement-water glass double liquid slurry is injected into the ground for reinforcement.

[0063] like Figure 9-11 As shown, the structure diagram of the composite lining arch formwork includes a secondary lining 3, an assembled rail arch frame 5, anchoring anchor rods 7, a ribbed formwork 11, surrounding rock 17, a steel pad 25, a composite reinforced lining 26, etc. The ribbed formwork 11 is hung and supported by the anchoring anchor rods 7. The anchoring anchor rods 7 are driven along the circumference of the tunnel and driven into the surrounding rock 17 to a certain depth. A steel pad 25 is set at the end of the anchoring anchor rod 7. Concrete is poured into the gap between the ribbed formwork 11 and the secondary lining 3 to seal and bury the assembled rail arch frame 5 to form a composite reinforced lining 26.

[0064] like Figure 12-14 As shown in the figure, the structure of the composite lining arch cavity with reinforced mesh and hanging steel plate includes initial support 1, waterproof layer 2, secondary lining 3, composite reinforced lining 26, cavity 27, hanger anchor rods 28, grooved pad 29, perforated shaped steel plate 30, longitudinal and transverse embedded reinforcement mesh 31, grouting pipe 32, double nuts 33, etc. The composite reinforced lining 26 has a cavity 27. After the cavity 27 is chiseled out, the longitudinal and transverse embedded reinforcement mesh 31 is installed inside. The longitudinal and transverse embedded reinforcement mesh 31 is embedded into the cavity 27 of the composite reinforced lining 26 by embedding reinforcement. Hanger anchor rods 28 are driven on both sides of the cavity 27. The hanger anchor rods 28 are embedded into the secondary lining 3 to a certain depth. The ends of the hanger anchor rods 28 are provided with grooved pads 29. The perforated shaped steel plate 30 is supported on the grooved pad 29, and the grooved pad 29 is fastened with double nuts 33. The perforated shaped steel plate 30 is hung and closed by the anchor rod 28. A plurality of grouting holes are set on the perforated shaped steel plate 30. The grouting pipe 32 is inserted into the grouting holes of the perforated shaped steel plate 30. The grouting pipe 32 injects concrete slurry to fill the local voids.

[0065] Example 2

[0066] Based on Example 1, Figure 15 As shown in the figure, a composite lining arch construction method is proposed, which includes the following construction steps:

[0067] S00. Construction Preparation: Before formal construction, a special construction plan is prepared in accordance with the relevant requirements of the operating line construction. The damaged areas such as the surrounding rock 17, the initial support 1 thickness is too thin, the waterproof layer 2 leaks, and the secondary lining 3 cracks are inspected. The cutting line of the arch groove 18 and the layout points of the anchor bolts 7 are measured and laid out. The base 13 is cast at the designed location, and the connectors are embedded in the base 13.

[0068] S10, driving anchor bolts 7: driving anchor bolts 7 into the secondary lining 3 along the anchor bolt arrangement points, with a spacing of 1.5 m × 1.5 m (circumferential × longitudinal). Each anchor bolt 7 is 1.9 meters long and driven into the surrounding rock 17.

[0069] S20, lining groove cutting and rebar planting: The surface of the secondary lining 3 is roughened to expose the fresh concrete surface. A concrete cutter is used to cut the surface of the secondary lining 3 along the measured and laid-out lines, with the width and depth of the cuts being consistent. A pneumatic rock drill is used to drill along the cutting lines to form an arch groove 18. After the arch groove 18 is chiseled and formed, the residue is removed. Φ22 fixed steel bars are evenly spaced in the arch groove 18. The circumferential spacing of the rebars 4 is 1m. The rebars 4 are firmly connected to the secondary lining 3 through drilling and anchoring agents.

[0070] S30, Arch installation: Before installing the assembled rail arch 5, self-propelled locking foot anchor rods 8 are driven into the maximum span and arch foot according to the design drawing. The locking foot anchor rods 8 are 4m long and are arranged in groups of 2.

[0071] The assembled rail arch 5 uses light rails, which are centrally manufactured in a processing yard outside the tunnel;

[0072] The qualified pre-assembled parts are transported to the tunnel and assembled in 5 sections. The assembled rail arch frame 5 is embedded in the arch groove 18 with a longitudinal spacing of 60 cm. The assembled rail arch frame 5 is welded to the embedded steel bars 4 in the secondary lining 3. The foot of the assembled rail arch frame 5 is welded with the end steel plate 12. The end steel plate 12 falls to the bottom of the base 13 and is connected to the embedded parts in the base 13 by hexagonal bolts 20.

[0073] After the position of the assembled rail arch 5 is adjusted correctly, a U-shaped steel bar 9 is welded at the end of the locking foot anchor rod 8 to lock the assembled rail arch 5. A Φ22 connecting bar 6 is welded between two adjacent assembled rail arches 5 to strengthen the connection;

[0074] At the same time, the gap between the assembled rail arch frame 5 and the arch groove 18 is filled with artificial molded concrete to form an arch groove filling concrete 19;

[0075] S40, Tie reinforcement and formwork: Install double-layer lining reinforcement with a spacing of 25 cm, circumferential main reinforcement Φ18, longitudinal distribution reinforcement Φ10, hook reinforcement Φ8, and tie the reinforcement mesh to the assembled rail arch 5;

[0076] Install a ribbed template 11 at the bottom of the steel mesh, the ribbed template 11 is placed on the assembled rail arch 5, and the ribbed template 11 is fixed by installing a steel plate 25 at the end of the anchor rod 7;

[0077] S50, pouring concrete: pouring concrete into the gap between the ribbed formwork 11 and the secondary lining 3, the concrete seals and buries the assembled rail arch 5 to form a composite reinforced lining 26, and the inner surface flatness of the reinforced lining 26 is required to be no greater than 1 / 20;

[0078] After the lining is completed, the inner surface of the composite reinforced lining 26 is polished and a permeable crystalline waterproof coating is applied to the inner surface;

[0079] S60. Install the steel frame beam structure: Chisel out the pavement structure layer 24 and pavement base layer 23 of the damaged section for 90 cm, chisel out part of the inverted arch backfill layer 22, cut and place platforms on both sides of the inverted arch 21, and place the pre-welded steel frame beam structure on the platforms on both sides of the inverted arch 21. The longitudinal channel steels 14 on both sides of the steel frame beam structure shall be [25a channel steel, the middle longitudinal section steel 15 shall be I12.6 section steel, and the transverse steel supports 16 shall be three I18 section steels laid side by side with a longitudinal spacing of 5 m. The longitudinal channel steels 14 shall be passed through two rows of grouting pipes 10 and driven into the ground to a certain depth. Cement-water glass double liquid slurry shall be injected into the ground through the grouting pipes 10 for reinforcement;

[0080] S70, Cavity Monitoring: Detect voids in newly constructed composite reinforced linings 26, mark the void 27 area, and manually chisel away any voids 27 with a lining thickness less than 20 cm. The chiseled surface should be 5 to 10 cm larger than the void 27 to ensure complete removal.

[0081] S80, Cavity repair: 27 cavities were treated with embedded steel bars, with a double-layer Φ16 longitudinal and transverse embedded steel mesh 31, with a spacing of 20 cm × 20 cm (circumferential × longitudinal), and the steel bars extended into the original lining by no less than 20 cm;

[0082] Hanger anchor rods 28 are driven around the cavity 27. The effective length of the hanger anchor rods 28 anchored into the lining is not less than 20 cm. The lower end of the hanger anchor rods 28 passes through a perforated shaped steel plate 30 and is fastened by a double nut 33. A grooved pad 29 is provided between the double nut 33 and the perforated shaped steel plate 30. A grouting pipe 32 is inserted into the perforated shaped steel plate 30, and slightly expanded fine stone concrete is poured through the grouting pipe 32.

[0083] After the fine stone concrete in the cavity 27 is basically filled, a sealing steel plate (located at the highest point of the cavity 27) is installed, grouting holes are reserved on the sealing steel plate, and finally cement mortar is injected to fill the cavity 27.

[0084] The parts not described in detail in this application are prior art, so this application does not describe them in detail.

[0085] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the elements may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0086] Although this document uses a lot of professional terms, it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of this application; interpreting them as any additional restrictions is contrary to the spirit of this application.

[0087] This application is not limited to the above-mentioned optimal implementation method. Anyone can derive various other forms of products based on the inspiration of this application. However, no matter what changes are made in their shape or structure, any technical solution that is the same or similar to that of this application falls within the scope of protection of this application.

Claims

1. The superimposed lining arch construction method is used to reinforce the surrounding rock fracture, the initial support thickness is too thin, the waterproof layer leakage and the secondary lining cracks. It is characterized by: The construction is carried out through a composite lining arch construction structure, which specifically includes the following construction steps: S00. Construction preparation: Inspect areas of broken surrounding rock, areas where initial support thickness is too thin, areas where the waterproof layer leaks, and areas where the secondary lining cracks; measure and lay out the cutting line for the arch groove and the arrangement points for the anchor bolts; cast the foundation at the designed location and embed the connectors in the foundation; S10. Driving anchor bolts: Driving anchor bolts into the secondary lining along the arrangement points of the anchor bolts until they penetrate into the surrounding rock; S20, Lining Grooving and Rebar Planting: Roughen the secondary lining surface to expose the fresh concrete surface. Use a concrete cutter to cut the secondary lining surface along the measured lines, keeping the width and depth of the cut consistent. Use a pneumatic rock drill to drill along the cutting line to create an arch groove. After the arch groove is chiseled and formed, remove the residue. Plant fixed steel bars at even intervals in the arch groove to form rebar. Ensure that the rebar is firmly connected to the secondary lining through the drilled holes and anchoring agents. S30, Arch installation: Before installing the assembled rail arch, self-propelled locking anchor rods are driven into the maximum span and arch foot according to the design drawing. The assembled rail arch is centrally manufactured in the processing yard outside the tunnel. After the pre-assembly is qualified, it is transported to the tunnel for segmented assembly. The assembled rail arch frame is embedded in the arch groove and welded to the embedded steel bars in the secondary lining. The assembled rail arch foot is welded with an end steel plate, which falls to the bottom of the base and is connected to the embedded parts in the base through hexagonal bolts; After the assembled rail arch is correctly adjusted, a U-shaped steel bar is welded to the end of the locking foot anchor rod to lock the assembled rail arch through the U-shaped steel bar; The connection between two adjacent assembled rail arches is strengthened by welding connecting bars, and the gap between the assembled rail arches and the arch groove is filled with cast-in-place concrete to form arch groove filling concrete; S40, Tie reinforcement and formwork: Install double-layer lining reinforcement, tie the reinforcement mesh to the assembled rail arch, install ribbed formwork below the reinforcement mesh, place the ribbed formwork on the assembled rail arch, and secure the ribbed formwork by installing steel pads at the ends of the anchor bolts; S50, pouring concrete: Pour concrete into the gap between the ribbed formwork and the secondary lining, sealing and burying the assembled rail arch with concrete to form a composite reinforced lining, and polishing the inner surface of the composite reinforced lining, and applying a permeable crystalline waterproof coating on the inner surface; S60, Installing the Steel Frame Beam Structure: Remove the pavement structure layer and base layer in the damaged section, remove part of the inverted arch backfill layer, cut and place platforms on both sides of the inverted arch, and place the pre-welded steel frame beam structure on the platforms on both sides of the inverted arch. Pass two rows of grouting pipes through the longitudinal channel steel of the steel frame beam structure and drive it into the ground to a set depth. Then, inject cement-water glass slurry into the ground through the grouting pipes for reinforcement. The composite lining arch construction structure includes: The spliced ​​rail arch is embedded and installed on the secondary lining by planting steel bars. The feet of the spliced ​​rail arch are locked and limited by locking anchor rods and U-shaped steel bars, and the end steel plate at the bottom of the spliced ​​rail arch is connected to the embedded parts in the concrete base by hexagonal bolts. A steel frame beam is provided in the pavement structure layer and is used to reinforce the pavement structure layer; The ribbed formwork is suspended and supported by anchor bolts, and the gap between the ribbed formwork and the secondary lining is poured with concrete so as to seal and bury the spliced ​​rail arch to form a superimposed reinforced lining; The longitudinal and transverse embedded reinforcement nets are arranged in the space after the cavity of the composite reinforced lining is chiseled out; The hole-shaped steel plate is used to seal the hole through the anchor rod, and the hole can be filled by injecting concrete grouting liquid through the grouting pipe.

2. The method for constructing a composite lining arch according to claim 1, characterized in that: An arch groove is opened in the secondary lining, and anchor bars are evenly implanted in the arch groove, so that the spliced ​​rail arch frame can be welded and fixed to the anchor bars after being embedded in the arch groove.

3. The method for constructing a composite lining arch according to claim 2, characterized in that: The adjacent assembled rail arch frames are connected into one by connecting ribs, and after the assembled rail arch frames are embedded in the arch grooves, the gaps on both sides of the assembled rail arch frames are fixed by filling the arch grooves with concrete.

4. The method for constructing a composite lining arch according to claim 1, characterized in that: The anchoring type anchor rods are driven along the circumferential direction of the tunnel and driven into the surrounding rock to a set depth.

5. The method for constructing a composite lining arch according to claim 1, characterized in that: The steel frame beam is welded together by longitudinal channel steel, longitudinal steel and transverse steel supports. The longitudinal channel steel is driven into the ground through a grouting conduit and then grouting is performed to strengthen and fix it.

6. The method for constructing a composite lining arch according to claim 1, characterized in that: The following construction steps are also included: S70, Cavity Monitoring: Detect voids in newly constructed composite reinforced linings, mark the void areas, and remove voids where the composite reinforced lining thickness is less than the set thickness; S80, Cavity repair: The hollow cavity is treated with rebar planting, and a double-layer longitudinal and transverse rebar planting network is implanted. Hanger anchor rods are driven around the cavity. The lower ends of the hanger anchor rods pass through the perforated shaped steel plate and are fastened with double nuts. A grooved pad is set between the double nut and the perforated shaped steel plate, a grouting pipe is inserted into the perforated shaped steel plate, and slightly expansive fine stone concrete is poured through the grouting pipe; After the fine stone concrete in the cavity is basically filled, a sealing steel plate is installed at the highest point of the cavity, and grouting holes are reserved on the sealing steel plate. Finally, cement mortar is injected to fill the cavity.

7. The method for constructing a composite lining arch according to claim 1, characterized in that: In step S50, the flatness of the inner surface of the laminated reinforced lining 26 is not greater than 1 / 20.

8. The method for constructing a composite lining arch according to claim 6, characterized in that: In step S70, the cavities with a thickness of less than 20 cm in the composite reinforced lining are manually chiseled out, and the chiseled surface area is ensured to be 5 to 10 cm larger than the cavity area.

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