Post-earthquake inverted arch repairing structure for traffic tunnel

Abstract

The utility model provides a traffic tunnel post-earthquake inverted arch repairing structure which comprises a steel frame cover arch and a shock insulation assembly, the steel frame cover arch is arranged below a tunnel lining section, the shock insulation assembly is arranged on the inner surface of a repaired inverted arch primary support, and a plurality of feet-lock anchor pipes are arranged on each side of a wall foot of the steel frame cover arch. The shock insulation assembly comprises polyurethane foam plates and rubber shock insulation supports, the polyurethane foam plates are evenly arranged on the inner surface of the repaired inverted arch primary support after being spliced and fixed through long steel nails with gaskets, and the rubber shock insulation supports are embedded in the middles of the polyurethane foam plates in a dot matrix mode. Reinforcing is conducted through the steel frame cover arch, and the stability of the lining upper structure is improved; the shock insulation support is arranged on the inner surface of the primary support, uneven deformation, caused by shock, of a surrounding rock-structure is effectively reduced, the lining structure can better adapt to deformation of the surrounding rock, the shock resistance of a traffic tunnel under the action of strong shock is improved, and safe operation of a lifeline of the traffic tunnel is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field related to traffic tunnel invert repair, in particular to a traffic tunnel invert repair structure after an earthquake. Background Art

[0002] The stability and seismic resistance of traffic tunnel structures under strong earthquakes are key considerations in engineering design and construction. With the large-scale construction of national lifeline projects, the number of traffic tunnels built in strong earthquake zones in western my country is increasing, and many tunnels pass through faults and weak surrounding rock zones. When tunnels are affected by strong earthquake motions, the uneven deformation of the surrounding rock-lining will cause lining damage, seriously threatening the safe operation of traffic tunnel lifeline projects.

[0003] As a key structure in a traffic tunnel, the invert can restrain the deformation of the surrounding rock and increase its stability. The invert must not only transfer the upper stratum pressure downward, but also balance the reaction force of the stratum below the tunnel. Tunnels under strong earthquake motion are prone to cracking and bulging of the invert, resulting in uneven tracks. The adjustable space of the track on the ballastless trackbed is extremely limited, and the damage of the invert will directly threaten driving safety.

[0004] Traditional invert arch renovation often adopts buffering methods such as speed limit operation, tunnel bottom anchoring and track slope fine-tuning, which cannot achieve the purpose of fundamentally solving the damage to the tunnel bottom. It will further aggravate the uncoordinated deformation of the tunnel bottom structure after multiple earthquakes, and increase the operating risk of high-speed trains. Utility Model Content

[0005] The utility model aims to provide a post-earthquake arch repair structure for a traffic tunnel, which can solve prominent earthquake damage problems such as arch bulge and cracking in the traffic tunnel under the action of a strong earthquake, improve the existing arch treatment method, and enhance the toughness of the traffic tunnel in a strong earthquake.

[0006] To this end, the technical solution adopted by the utility model is: a traffic tunnel post-earthquake arch repair structure, including a steel frame arch and a seismic isolation component, the steel frame arch is arranged below the tunnel lining section, and the upper lining section is fixed when the tunnel arch is repaired, the seismic isolation component is arranged on the inner surface of the primary support of the repaired arch to reduce the uneven deformation of the surrounding rock-structure caused by vibration, a plurality of locking anchor pipes are arranged on each side of the wall foot of the steel frame arch, the seismic isolation component includes a polyurethane foam board and a rubber seismic isolation bearing, the polyurethane foam board is matched with the inner surface of the primary support of the repaired arch after splicing, and is evenly arranged on the inner surface of the primary support of the repaired arch, the rubber seismic isolation bearing is embedded and arranged in the center of the polyurethane foam board in a lattice manner, each polyurethane foam board is correspondingly embedded with a rubber seismic isolation bearing, and the bottom surface of the rubber seismic isolation bearing is firmly fixed with epoxy mortar.

[0007] It is further preferred that the joints of each steel frame sleeve arch are fixedly connected by steel bars, and steel pipe piles with steel cages are respectively arranged at the height of 20 to 40 cm from the top surface of the side ditch at the foot of the two sides of the wall. The steel frame sleeve arch is reinforced by arranging steel pipe piles and steel cages to ensure the stability of the steel frame sleeve arch.

[0008] More preferably, the steel frame sleeve arch is connected longitudinally by I-beams, and a channel steel is arranged on both sides of the bottom of the steel frame sleeve arch. The steel frame sleeve arch is connected longitudinally by I-beams, which can strengthen the integrity of the steel frame sleeve arch and ensure that the steel frame sleeve arch is firmly fixed.

[0009] More preferably, the steel frame arch joints are provided with steel frame fixing steel bars welded to the steel frame arch. The steel frame fixing steel bars are added to fix the steel frame arch, thereby ensuring the stability of the steel frame arch and the safety of the staff during work.

[0010] Further preferably, the spacing between each adjacent steel frame arch is 0.5m, and 4 locking foot anchor pipes are provided at the corners on each side of each steel frame arch. The length of the locking foot anchor pipes is 3.5-4.5m and the diameter is 41-43mm.

[0011] More preferably, the installation gap between the polyurethane foam boards is 5 to 10 mm.

[0012] More preferably, the polyurethane foam board is fixed by long steel nails with gaskets. The polyurethane foam board is fixed to the inner surface of the repaired primary support of the inverted arch by the long steel nails with gaskets to ensure that the polyurethane foam board is firmly fixed.

[0013] The beneficial effects of the utility model are as follows: temporary reinforcement is carried out by arranging a steel frame sleeve arch, thereby improving the stability of the lining upper structure, ensuring that the lining part will not collapse or fall when the invert arch is removed; by arranging a seismic isolation bearing on the inner surface of the primary support, the uneven deformation of the surrounding rock-structure caused by vibration is effectively reduced, the lining structure is made more adaptable to the deformation of the surrounding rock, the anti-shock absorption capacity of the traffic tunnel under the action of a strong earthquake is improved, and the safe operation of the lifeline of the traffic tunnel is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a two-dimensional schematic diagram of the steel frame sleeve arch after installation in the utility model.

[0015] Figure 2 It is a three-dimensional schematic diagram of the steel frame sleeve arch after installation in the utility model.

[0016] Figure 3 It is a two-dimensional schematic diagram of the inverted arch after restoration in the utility model.

[0017] Figure 4 It is a three-dimensional schematic diagram of the inverted arch after restoration in the utility model.

[0018] Figure 5 It is a schematic diagram of the planar layout of the inverted arch seismic isolation support in the utility model.

[0019] Figure 6 It is a cross-sectional view of the utility model in which the inverted arch seismic isolation bearing is installed on the inner surface of the primary support. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0021] As shown in Figures 1-6, a traffic tunnel post-earthquake arch repair structure includes a steel frame arch 2 and a seismic isolation assembly. The steel frame arch 2 is arranged below the tunnel lining section. When repairing the tunnel arch 8, the upper lining section is fixed. The joints of each steel frame arch 2 are fixedly connected by steel bars. Steel pipe piles 5 with steel cages are respectively arranged at the positions of 20 to 40 cm above the top surface of the side ditch 1 at the foot of the walls on both sides. The steel pipe piles 5 and the steel cage are arranged to reinforce the steel frame arch 2 to ensure its stability.

[0022] The steel frame arch 2 is connected longitudinally by I-beams, and a channel steel is arranged on both sides of the bottom of the steel frame arch 2. The steel frame arch 2 is connected longitudinally by I-beams, which can strengthen the integrity of the steel frame arch 2 and ensure that the steel frame arch 2 is firmly fixed.

[0023] The joint positions of the steel frame sleeve arch 2 are all provided with steel frame fixing steel bars 4 welded with the steel frame sleeve arch 2. The steel frame fixing steel bars 4 are added to fix the steel frame sleeve arch 2 to ensure the stability of the steel frame sleeve arch 2 and the safety of the staff during work.

[0024] The spacing between each adjacent steel frame arch 2 is 0.5m, and four locking foot anchor pipes 3 are arranged at the corners on each side of each steel frame arch 2. The length of the locking foot anchor pipe 3 is 3.5-4.5m and the diameter is 41-43mm.

[0025] The seismic isolation component is arranged on the inner surface of the primary support of the repaired back arch to reduce the uneven deformation of the surrounding rock-structure caused by vibration. A number of locking anchor pipes 3 are arranged on each side of the wall foot of the steel frame sleeve arch 2. The seismic isolation component includes polyurethane foam panels 6 and rubber seismic isolation supports 7. The polyurethane foam panels 6 are evenly arranged on the inner surface of the primary support of the repaired back arch after splicing. The rubber seismic isolation supports 7 are embedded and arranged in the center of the polyurethane foam panels 6 in a lattice manner. Each polyurethane foam panel 6 is correspondingly embedded with a rubber seismic isolation support 7. The bottom surface of the rubber seismic isolation support 7 is firmly fixed with epoxy mortar. The installation gap between the polyurethane foam panels 6 is 5 to 10 mm.

[0026] The polyurethane foam plate 6 is fixed by a long steel nail with a gasket. The polyurethane foam plate 6 is fixed to the first support inner surface of the inverted arch after repair by a long steel nail with a gasket to ensure that the polyurethane foam plate 6 is firmly fixed.

[0027] By setting up the steel frame arch 2 for temporary reinforcement, the stability of the lining superstructure is improved, ensuring that the lining part will not collapse or fall when the invert arch 8 is dismantled; by setting up seismic isolation bearings on the inner surface of the primary support, the uneven deformation of the surrounding rock-structure caused by vibration is effectively reduced, making the lining structure more adaptable to the deformation of the surrounding rock, improving the anti-shock absorption capacity of the traffic tunnel under strong earthquakes, and ensuring the safe operation of the lifeline of the traffic tunnel.

[0028] The primary support and the original inverted arch inner edge line 901 before repair are removed, and the repair is carried out after expansion. The curvature of the inverted arch after repair is increased. The positions of the primary support and the newly made inverted arch inner edge line 902 are as follows: Figure 3 and Figure 4 As shown in the figure, increasing the curvature of the invert can increase the overall stability of the lining section, inhibit the uplift of the invert and limit the settlement of the arch crown; increase the supporting resistance of the bottom and wall, and prevent shear failure caused by internal squeezing under strong earthquakes.

[0029] Combination Figure 6 As shown, a waterproof layer 10 is provided above the polyurethane foam board 6 and the rubber seismic isolation support 7 to separate the inverted arch from the polyurethane foam board 6 and the rubber seismic isolation support 7 to prevent water from penetrating. The rubber seismic isolation support 7 is made of a composite of rubber and a stiffening steel plate, and the rubber seismic isolation support 7 is embedded in the polyurethane foam board 6 to protect the rubber seismic isolation support 7.

[0030] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A post-earthquake arch repair structure for a traffic tunnel. Features: The invention comprises a steel frame arch (2) and a seismic isolation component. The steel frame arch (2) is arranged below the tunnel lining section and fixes the upper lining section when repairing the tunnel arch. The seismic isolation component is arranged on the inner surface of the primary support of the repaired arch to reduce the uneven deformation of the surrounding rock structure caused by vibration. A plurality of locking anchor pipes (3) are arranged on each side of the foot of the steel frame arch (2). The seismic isolation component comprises a polyurethane foam board (6) and a rubber seismic isolation support (7). The polyurethane foam board (6) matches the inner surface of the primary support of the repaired arch after splicing and is evenly arranged on the inner surface of the primary support of the repaired arch. The rubber seismic isolation support (7) is embedded and arranged in the center of the polyurethane foam board (6) in a lattice manner. Each polyurethane foam board (6) is correspondingly embedded with a rubber seismic isolation support (7). The bottom surface of the rubber seismic isolation support (7) is firmly fixed with epoxy mortar.

2. A post-earthquake arch repair structure for a traffic tunnel according to claim 1, Features: The joints of each steel frame arch (2) are fixedly connected by steel bars, and steel pipe piles (5) with steel cages are respectively arranged at the foot of the walls on both sides at a height of 20 to 40 cm from the top surface of the side ditch (1).

3. A post-earthquake arch repair structure for a traffic tunnel according to claim 1, Features: The steel frame arch (2) is longitudinally connected by I-beams, and a channel steel is arranged on both sides of the bottom of the steel frame arch (2).

4. The post-earthquake arch repair structure of a traffic tunnel according to claim 1, Features: Steel frame fixing steel bars (4) welded to the steel frame sleeve arch (2) are arranged at the joint positions of the steel frame sleeve arch (2).

5. The post-earthquake arch repair structure of a traffic tunnel according to claim 1, Features: The spacing between each adjacent steel frame arch (2) is 0.5m, and four locking foot anchor pipes (3) are arranged at the corners of each side of each steel frame arch (2). The length of the locking foot anchor pipe (3) is 3.5-4.5m and the diameter is 41-43mm.

6. The post-earthquake arch repair structure of a traffic tunnel according to claim 1, Features: The installation gap between the polyurethane foam boards (6) is 5 to 10 mm.

7. The post-earthquake arch repair structure of a traffic tunnel according to claim 1, Features: The polyurethane foam plate (6) is fixed by using long steel nails with gaskets.

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