Structure for reinforcing shield tunnel structure through multiple layers of composite plates

Abstract

The utility model discloses a structure for reinforcing a shield tunnel structure through multiple layers of composite plates. The structure aims at improving the bearing capacity and the structural stability of tunnel segments. According to the structure, curve-shaped FRP profiles with the thickness of 6-10 mm are used for adjacent blocks and adjacent pipe pieces without cracks, curve-shaped FRP profiles with the thickness of 10-15 mm are used for the tops of a plurality of transverse cracks, and the multiple layers of FRP profiles are pasted through structural adhesive in a staggered joint mode to be tightly combined with the tunnel pipe pieces, so that cracking deformation is reduced, and pipe piece cracks are repaired; considering the construction convenience and the reinforcement effect optimization, the reinforcing structure has the advantages of light weight, high strength, corrosion resistance and the like, and is easy to process and install. The reinforcing method is high in adaptability, can be applied to shield tunnels of different types and geological conditions, and can delay the crack development speed, improve the pipeline bearing capacity, improve the overall performance of the tunnel and prolong the service life of the tunnel.

Description

Technical Field

[0001] This utility model relates to the field of shield tunnel reinforcement structure design technology, and in particular to a structure for reinforcing shield tunnels with multi-layer composite panels. Background Technology

[0002] With the acceleration of urbanization, underground space development is increasingly becoming an important means to alleviate urban surface traffic pressure and optimize urban spatial layout. Shield tunnels, as an important form of underground transportation construction, are widely used in subways, municipal utility tunnels, and other projects due to their advantages such as fast construction speed and minimal impact on the surface environment. However, as tunnels age, tunnel segments gradually reveal various problems, such as cracks, spalling, and deformation, which seriously threaten the safety and stability of the tunnels.

[0003] Patent CN117852144A discloses a design method for composite reinforced shield tunnel lining structures based on failure modes. This method is based on the failure mechanism of a whole-ring test of composite reinforced shield tunnels, and considers the stress development history of the shield tunnel segments. Based on the stress development of different sections, it calculates the height of the compression zone and the strain variable of the concrete in the compression zone under incremental load, and solves the cross-sectional strain and stress distribution under specific incremental loads, thus solving the problem of the inability to measure the stress history of in-service shield tunnels. By iteratively calculating and matching the signs of the bending moment and stiffness of the cross-section, it solves the problem of different stiffness of the asymmetric cross-section of the composite shield tunnel under positive and negative bending moments. Through three-dimensional laser scanning, it obtains the failure deformation of the shield tunnel before reinforcement and incorporates the initial deformation into the calculation of the bearing capacity and stiffness of the composite reinforced shield tunnel.

[0004] However, the patent has the following drawback: it calculates the bearing capacity and stiffness of the shield tunnel, but does not take measures to directly enhance the local or overall strength of the tunnel lining. Utility Model Content

[0005] The purpose of this utility model is to solve the problems existing in the prior art and to propose a structure for reinforcing shield tunnels with multi-layer composite panels.

[0006] This utility model provides the following technical solution: a structure for reinforcing shield tunnel structure with multi-layer composite material plate, including tunnel segments, anchor bolts, manholes and multi-layer curved FRP profiles;

[0007] The tunnel segments are fixed to the inner wall of the shield tunnel, and hand holes are opened on the outer wall of the tunnel segments. Anchor bolts connected by bolts are provided on the inner wall of the tunnel segments.

[0008] The six tunnel segments are spliced ​​together to form a segment ring, which is tightly attached to the inside of the tunnel. The anchor bolts on both sides of the outer wall of the tunnel segment are connected by bolts to connect adjacent tunnel segments, and then the segments are fixed by bolts inside the manhole.

[0009] The inner wall of the tunnel segment is provided with multi-layer curved FRP profiles, which are made by bonding multiple single-layer FRP profiles with staggered joints using structural adhesive.

[0010] Multi-layer curved FRP profiles are tightly attached to the inner wall of the tunnel segment, and the flanges on both sides are coated with structural adhesive and fixed to the inner wall of the tunnel segment. The multi-layer curved FRP profiles are bonded to the inner wall of the tunnel segment in a staggered manner.

[0011] Preferably, the inner wall of the tunnel segment is also provided with a track bed, and the outer wall of the track bed is provided with a support; the track bed has the functions of transmitting loads, preventing the track from moving laterally and longitudinally, and draining water, while the support supports and fixes the track bed and can absorb a certain degree of impact force.

[0012] The beneficial effects of this utility model are:

[0013] 1. The structure proposed in this utility model, which uses staggered bonding of multi-layer curved FRP profiles to reinforce shield tunnel structures, significantly improves the load-bearing capacity and structural stability of tunnel segments. By employing a method of tightly bonding multi-layer curved FRP profiles with tunnel segments, combined with staggered bonding and structural adhesive bonding reinforcement measures, the cracking and deformation of tunnel segments caused by factors such as geological changes, construction errors, or operational loads are significantly reduced.

[0014] 2. This utility model utilizes staggered-joint bonding of multi-layer curved FRP profiles to reinforce shield tunnel structures, with a design that fully considers both ease of construction and optimal reinforcement effect. FRP profiles offer advantages such as light weight, high strength, and corrosion resistance, and are easy to process and install. Standardized design and modular construction significantly shorten the construction cycle and reduce costs. Furthermore, the use of staggered-joint structural adhesive for bonding the multi-layer FRP further enhances the structure's rigidity and durability, ensuring the longevity and reliability of the reinforcement effect.

[0015] 3. The reinforcement method of this utility model can effectively address various problems that may occur in tunnel segments during operation, improving the overall performance and service life of the tunnel. Furthermore, this reinforcement method is applicable to different types of shield tunnels and different geological conditions, exhibiting strong adaptability and flexibility. Attached Figure Description

[0016] Figure 1 This is a flowchart illustrating a design method for a multi-layer composite plate reinforced shield tunnel structure according to this utility model.

[0017] Figure 2This is a schematic diagram of the pre-installation process in this utility model;

[0018] Figure 3 This is a schematic diagram of the installation process in the later stages of this utility model;

[0019] Figure 4 This is an overall schematic diagram of the multi-layer composite board reinforced shield tunnel structure in this utility model;

[0020] Figure 5 This is a schematic diagram of the installation of tunnel segments and staggered bonding of multi-layer curved FRP profiles in this utility model;

[0021] Figure 6 This is a schematic diagram of the tunnel segment handhole in this utility model;

[0022] Figure 7 This is a schematic diagram of the staggered bonding multi-layer curved FRP profile in this utility model;

[0023] Figure 8 This is a schematic diagram of the single-layer curved FRP profile in this utility model.

[0024] Reference numerals: 101, tunnel segment; 102, anchor bolt; 103, manhole; 201, multi-layer curved FRP profile; 301, support; 302, track bed. Detailed Implementation

[0025] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0026] like Figure 1-8 As shown, a design method for a multi-layer composite plate reinforced shield tunnel structure includes the following steps:

[0027] Step S1: Seal the manhole 103, then mark the installation area in the area to be reinforced in the shield tunnel, clean and treat the surface of the tunnel segment 101 to ensure that there are no debris, oil stains, etc., so as to ensure the tight bonding between the multi-layer curved FRP profile 201 and the tunnel segment 101.

[0028] The specific steps include:

[0029] S1.1: Prepare suitable sealing materials, such as fireproof sealant, steel plates, bolts, etc., and ensure that the materials meet safety standards and design requirements;

[0030] S1.2: Select an appropriate sealing method according to the size and shape of the manhole 103; for small manholes 103, sealant can be used directly for filling; for large manholes 103 or those that need to withstand greater pressure, steel plates should be used for reinforcement and bolt fastening for sealing.

[0031] S1.3: After the sealing is completed, a sealing test should be conducted on the sealed area to ensure that there is no air or water leakage, so as to ensure the independence of the construction environment;

[0032] S1.4: Use measuring tools such as total station and rangefinder to accurately measure the specific location and dimensions of the area to be reinforced;

[0033] S1.5: Based on the measurement results, use clear markings such as paint or tape to mark the boundary line of the installation area on the tunnel segment 101; the markings should be clear, accurate, and easy to identify;

[0034] S1.6: Use brooms, vacuum cleaners, or other tools to remove dust, sand, and other debris from the surface of tunnel segment 101. For stubborn oil stains, rust, etc., chemical cleaning agents or high-pressure water guns can be used for deep cleaning. Be careful to use appropriate cleaning agents to avoid corroding the tunnel segment 101.

[0035] S1.7: After cleaning, the surface of the tunnel segment 101 shall be treated as needed to improve its adhesion to the multi-layer curved FRP profile 201;

[0036] Step S2: Install multi-layer curved FRP profiles 201 on the inner wall of tunnel segment 101. The outer arc surface of the multi-layer curved FRP profiles 201 is covered with structural adhesive of not less than 5mm and installed tightly against the tunnel segment 101. Adjacent multi-layer curved FRP profiles 201 are aligned and glued together. The multi-layer curved FRP profiles 201 are glued together with staggered joints using structural adhesive.

[0037] The specific steps include:

[0038] S2.1: Design a multi-layer curved FRP profile 201 structure. This structure is made of multiple layers of FRP material bonded together. Each layer of FRP material is integrally formed. The outermost FRP layer has a size that is equivalent to the inner arc size of the shield tunnel segment 101, and is used to fit tightly with the inner arc surface of the shield tunnel segment 101.

[0039] S2.2: Determine the size and quantity of the multi-layer curved FRP profile 201. Based on the size of the shield tunnel segment 101 to be reinforced and the reinforcement requirements, calculate and design the specific size of the multi-layer curved FRP profile 201 and the required quantity of the multi-layer curved FRP profile 201 to ensure the reinforcement effect. Prepare the multi-layer curved FRP profile 201 by using FRP material molding processes, such as prepreg, pultrusion, or winding, to prepare the multi-layer curved FRP profile 201 that meets the design requirements.

[0040] S2.3: Select structural adhesive materials that meet the requirements, ensuring good stability and strength; perform surface treatment as needed: roughen the areas to be repaired or bonded, then clean with a cleaning agent. Prepare the adhesive according to a certain ratio and use it within the specified operating time.

[0041] S2.4: Several layers of FRP profiles are bonded together in a staggered manner to form a multi-layer curved FRP profile 201. The outer arc surface of the prepared multi-layer curved FRP profile 201 is coated with structural adhesive with a thickness of not less than 5mm. Then, the outer arc surface of the multi-layer curved FRP profile 201 is attached to the inner arc surface of the shield tunnel segment 101, ensuring that there are no air bubbles or voids. Appropriate tools such as clamps and support frames are used to temporarily fix the multi-layer curved FRP profile 201 to prevent displacement before the structural adhesive solidifies.

[0042] S2.5: Structural adhesive solidifies, fixing the multi-layer curved FRP profile 201 to the inner wall of the tunnel segment 101;

[0043] S2.6: Verify the effect of multi-layer curved FRP profile 201 in reinforcing shield tunnel structures through simulation experiments or actual use, including indicators such as reinforcement strength, durability, and impermeability.

[0044] The specific steps also include:

[0045] S2.61: Use computer simulation software to perform stress analysis on the reinforced structure and optimize the design based on the results; In the stress analysis and optimization steps, introduce multiphysics coupling analysis to more comprehensively evaluate the stress situation of the structure;

[0046] The load-bearing capacity of tunnel segment 101 reinforced with multi-layer curved FRP profile 201 should be verified according to the following formula:

[0047]

[0048] In the formula: σ represents normal stress, which is the stress component perpendicular to the cross section. Depending on the load direction, normal stress is further divided into tensile stress and compressive stress; tensile stress is positive, and compressive stress is negative; τ represents shear stress, which is the stress component parallel to the cross section. Shear stress typically occurs in shear deformation or torsional deformation. x σ y σ z These are the normal stresses in the x, y, and z directions, respectively, τ xy τ yz τ zx These are the shear stresses on the corresponding planes, which can be used to calculate the stress distribution and deformation of the structure under different loads, thus providing a basis for structural design and optimization.

[0049] Step S3: Structural adhesive solidification, fixing the multi-layer curved FRP profile 201 to the inner wall of the tunnel segment 101, including:

[0050] S3.1: After the adhesive is applied, any residue on the pipe wall should be cleaned up in a timely manner to prevent the residue from affecting subsequent construction.

[0051] S3.2: After the adhesive is applied, the adhesive effect should be tested, including the strength, density and bonding strength of the adhesive with the tunnel segment 101.

[0052] The structure using the above-mentioned design method for reinforcing shield tunnel structure with multi-layer composite panels includes tunnel segments 101, anchor bolts 102, manholes 103, and multi-layer curved FRP profiles 201.

[0053] The tunnel segment 101 is fixed to the inner wall of the shield tunnel, the outer wall of the tunnel segment 101 is provided with a hand hole 103, and the inner wall of the tunnel segment 101 is provided with anchor bolts 102 connected by bolts.

[0054] The six tunnel segments 101 are spliced ​​together to form a segment ring, which is tightly attached to the inside of the tunnel. The anchor bolts 102 on both sides of the outer wall of the tunnel segment 101 are connected by bolts to connect adjacent tunnel segments 101, and then the connection and fixation are made by bolts inside the handhole 103.

[0055] The inner wall of the tunnel segment 101 is provided with a multi-layer curved FRP profile 201, which is made by bonding multiple single-layer FRP profiles with staggered joint structural adhesive.

[0056] Multi-layer curved FRP profile 201 is tightly attached to the inner wall of tunnel segment 101, and the flanges on both sides are coated with structural adhesive and fixed to the inner wall of tunnel segment 101. Multi-layer curved FRP profile 201 is pasted to the inner wall of tunnel segment 101 in a staggered manner.

[0057] When applying structural adhesive to the tunnel segments, surface treatment of the segments should be performed as needed: roughen the areas to be repaired or bonded, and then clean them with a cleaning agent. Prepare the adhesive according to a certain ratio and use it within the specified operating time. During the application of the structural adhesive, control the application pressure and apply the adhesive evenly to avoid uneven adhesion between the adhesive and the tunnel segments 101, which could lead to weak adhesion. After bonding, promptly clean any residue from the tunnel wall to prevent it from affecting subsequent construction.

[0058] After the adhesive is applied, the adhesive effect is tested, including the strength, density and bonding strength of the adhesive with the tunnel segment 101. Then, the multi-layer curved FRP profile 201 is integrated with the tunnel segment 101 to enhance the structural strength of the tunnel segment 101.

[0059] The inner wall of the tunnel segment 101 is also provided with a track bed 302, and the outer wall of the track bed 302 is provided with a support 301. The track bed 302 has the functions of transmitting loads, preventing the track from moving laterally and longitudinally, and draining water. The support 301 supports and fixes the track bed 302 and can absorb a certain degree of impact force.

[0060] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A structure of reinforcing a shield tunnel structure with a multi-layer composite plate, characterized by, It comprises a tunnel segment (101), an anchor bolt (102), a hand hole (103) and a multi-layer curved FRP profile (201); The tunnel segment (101) is fixed on the inner wall of the shield tunnel, the outer wall of the tunnel segment (101) is provided with a hand hole (103), and the inner wall of the tunnel segment (101) is provided with an anchor bolt (102) connected by a bolt; Six tunnel segments (101) are spliced into a segment ring, which is tightly attached to the inside of the tunnel, the anchor bolts (102) on the outer walls of the two sides of the tunnel segment (101) are connected by bolts, the adjacent tunnel segments (101) are connected, and the inside of the hand hole (103) is connected and fixed by the bolt; The inner wall of the tunnel segment (101) is provided with a multi-layer curved FRP profile (201), and the multi-layer curved FRP profile (201) is glued and pasted by a plurality of single-layer FRP profiles in a staggered structure; The multi-layer curved FRP profile (201) is tightly attached to the inner wall of the tunnel segment (101), the flanges on both sides are fully coated with structural glue and fixed on the inner wall of the tunnel segment (101), and the multi-layer curved FRP profile (201) is glued and pasted on the inner wall of the tunnel segment (101) in a staggered manner.

2. A structure of reinforcing a shield tunnel structure with a multi-layer composite plate according to claim 1, wherein The inner wall of the tunnel segment (101) is further provided with a track bed (302), and the outer wall of the track bed (302) is provided with a support (301).

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