Shield segment reinforcing structure adopting corrugated steel plates and UHPC (Ultra High Performance Concrete)

Abstract

The utility model relates to the technical field of tunnel structure reinforcement, in particular to a shield segment reinforcement structure adopting a corrugated steel plate and UHPC (Ultra High Performance Concrete), which comprises a segment body, a steel plate body is arranged at the lower end of the segment body, ultra high performance concrete is arranged between the inner side of the segment body and the steel plate body, and the steel plate body consists of a plurality of corrugated units which are arranged side by side. The corrugated steel plate and the UHPC are cooperatively applied to reinforcement of the shield segment, an efficient and reliable reinforcement structure system is formed, the thin-layer design is achieved, the influence on tunnel clearance is remarkably reduced, the construction period is shortened, the construction cost is reduced, and the construction efficiency is improved. Meanwhile, the interface bonding performance is remarkably enhanced, and the stripping risk is effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of tunnel structure reinforcement technology, and in particular to a shield tunnel segment reinforcement structure using corrugated steel plates and UHPC. Background Technology

[0002] Tunnel reinforcement refers to reinforcement measures taken when cracks appear in the secondary lining of a tunnel, or at points of tunnel deformation and cracking, weak rock layers, or water-bearing sections. There are two main categories: organic and inorganic. Although organic polymer solution-type grouting materials have good permeability and controllable setting time, most of them have varying degrees of toxicity, easily causing environmental pollution, and are also expensive, thus limiting their application. Inorganic grouting materials include cement slurry series, cement-water glass series, and water glass series. These three types of grouts are easy to mix and economical, and are widely used, especially the cement-water glass series, which has excellent properties.

[0003] Meanwhile, shield tunnel linings assembled with high-strength bolts are highly sensitive to changes in surrounding environmental conditions during long-term operation. Factors such as adjacent foundation pit excavation, surface overloading, and changes in groundwater levels can all trigger a series of structural defects, such as excessive deformation, cracks, and water leakage. If reinforcement is not carried out in a timely manner, it will affect the structural safety and traffic safety of the tunnel. To ensure the normal operation of shield tunnels, it is necessary to effectively reinforce them to improve the load-bearing capacity and overall stiffness of damaged tunnels. Currently, commonly used shield tunnel reinforcement methods mainly include fiber cloth bonding reinforcement, internal tensioned steel ring reinforcement, and composite cavity bonding reinforcement. However, these methods still have some shortcomings in practical applications, such as complex construction processes, high project costs, long construction periods, and limited reinforcement effects. Utility Model Content

[0004] To overcome the problem that shield tunnel linings assembled with high-strength bolts are highly sensitive to changes in surrounding environmental conditions during long-term operation, such as adjacent foundation pit excavation, surface overload, and changes in groundwater level, which may cause a series of structural defects, this utility model provides a shield tunnel segment reinforcement structure using corrugated steel plates and UHPC.

[0005] The technical solution is as follows: A shield tunnel segment reinforcement structure using corrugated steel plate and UHPC includes the tunnel segment itself, a steel plate itself installed at the lower end of the tunnel segment itself, and ultra-high performance concrete between the inner side of the tunnel segment itself and the steel plate itself. The steel plate itself is composed of multiple corrugated units arranged side by side, and multiple sets of welding studs are welded to the upper end of the inside of the steel plate itself to connect the steel plate itself with the ultra-high performance concrete.

[0006] Furthermore, multiple sets of grouting holes are opened on the lower surface of the steel plate itself, and multiple sets of anchor bolt installation holes are opened on the lower surface of the steel plate itself near the edge line.

[0007] Furthermore, the steel plates themselves are all made of corrugated units using a one-piece molding technology, and adjacent steel plates are connected by welding or connectors.

[0008] Furthermore, the corrugated arrangement of the steel plate itself is radially arranged along the segment itself, and there is a certain distance between the segment itself and the steel plate itself.

[0009] Furthermore, the multiple sets of anchor bolt installation holes are equipped with anchor bolt bodies that connect the segment itself and the steel plate itself.

[0010] Furthermore, multiple grouting holes are pre-drilled at equal intervals on the steel plate itself, and ultra-high performance concrete is filled into the steel plate through the grouting holes.

[0011] Furthermore, the ultra-high performance concrete is tightly bonded to the segments and corrugated steel plates themselves through welded studs and grouting holes.

[0012] Furthermore, the steel plate itself is coated with an anti-corrosion polyurethane coating.

[0013] The beneficial effects are as follows: This utility model achieves a highly efficient and reliable reinforcement structure system by synergistically applying corrugated steel plates and UHPC to the reinforcement of tunnel segments. It realizes a thin-layer design, significantly reduces the impact on tunnel clearance, improves space utilization, and significantly enhances interfacial bonding performance, effectively avoiding the risk of peeling. It also has excellent corrosion resistance, fatigue resistance, and long service life characteristics, making it particularly suitable for complex working conditions with water seepage, high loads, or corrosive environments. It provides a durable and stable guarantee for the safe operation of tunnel structures. Ultra-high performance concrete has extremely high strength, and its compressive and tensile properties are significantly better than ordinary concrete. It has excellent durability, excellent impermeability, frost resistance, and erosion resistance, which can greatly extend the service life of the structure and reduce maintenance costs. It has good workability, strong fluidity, and is easy to cast and mold. At the same time, it has a low shrinkage rate, which can effectively reduce the generation of cracks and ensure the integrity and stability of the structure. It has broad application prospects. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of a shield tunnel segment reinforcement structure using corrugated steel plates and UHPC according to this utility model.

[0015] Figure 2 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 3 This is a three-dimensional structural diagram of the anchor bolt mounting hole weld stud of this utility model.

[0017] Figure 4 This is a schematic diagram of the three-dimensional structure of the ultra-high performance concrete of this utility model;

[0018] Figure 5 This is a schematic diagram of the three-dimensional structure of the corrugated groove of this utility model.

[0019] In the attached diagram, the following are the reference numerals: 1. Segment itself; 2. Steel plate itself; 201. Corrugated unit; 3. Anchor bolt mounting hole; 4. Grouting hole; 5. Anchor bolt body; 6. Weld stud; 7. Ultra-high performance concrete. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0021] Among the currently discovered feasible technologies, the following are described:

[0022] Tunnel reinforcement refers to the process of strengthening and stabilizing the original structure of a tunnel during operation, addressing issues such as cracks, structural deformation, fissures, weak rock strata, and water inrush sections in the secondary lining. This involves a series of engineering techniques to restore the tunnel's load-bearing capacity, prevent further deterioration, and ensure the safety of the tunnel structure and traffic. Depending on the location of the reinforcement and the complexity of the geological conditions, tunnel reinforcement typically includes various forms such as structural reinforcement, ground reinforcement, and water-stopping and seepage prevention. Among the many reinforcement methods, grouting reinforcement technology is widely used in tunnel engineering due to its advantages such as flexible construction, strong applicability, and minimal disturbance to the original structure. Based on the chemical properties of the grouting materials, they can be mainly divided into two categories: organic and inorganic. Organic polymer solution-type grouting materials are a type of grouting material with epoxy resin, polyurethane, and acrylate as the main components. These materials have good permeability, can diffuse and solidify in micro-cracks, and their setting time can be adjusted according to project needs, making them suitable for special occasions such as quickly sealing leaks and enhancing rock mass strength. However, most organic grouting materials contain a certain amount of toxic chemicals, which may release harmful gases during the curing process, posing a certain risk of environmental pollution. Furthermore, their raw material costs are high, and their long-term durability is uncertain, thus limiting their application in practical engineering. They are mostly used for localized emergency reinforcement projects with low environmental requirements. In contrast, inorganic grouting materials, due to their environmental friendliness, economy, and ease of preparation, have been more widely used in tunnel reinforcement projects. Common inorganic grouting materials mainly include the following three categories: Cement grout series: These use ordinary Portland cement as the main component, and their fluidity and injectability are controlled by adjusting the water-cement ratio. This type of grout has high compressive strength and good long-term stability, making it suitable for reinforcing strata with large cracks or well-developed pores. However, its particle size is relatively large, making it difficult to penetrate into micro-cracks, and its setting time is long, making it unsuitable for rapid construction needs. Cement-water glass dual-liquid grouting materials: These consist of cement grout and water glass (sodium silicate) solution. After mixing, the two undergo a chemical reaction, rapidly forming calcium silicate gel, thereby achieving rapid setting and early strength growth. This material possesses excellent groutability, controllable setting time, and high strength development, making it particularly suitable for rapid reinforcement and water-stopping treatment in geological conditions such as weak and fractured surrounding rock and water-bearing sections. It is one of the most commonly used and mature grouting systems in tunnel engineering. Water glass series grouting materials: The main component is water glass solution, often used in combination with curing agents (such as calcium chloride, phosphate, etc.) to form a gel with a certain strength. Its advantages include low viscosity and strong permeability, making it suitable for filling small cracks and grouting for water-stopping in areas rich in groundwater. However, due to its relatively low later-stage strength and general durability, it is usually used as an auxiliary grouting material.

[0023] With the rapid development of urban underground space development and rail transit construction, shield tunneling has become a widely adopted, efficient, and safe construction method in urban tunnel engineering. Among these methods, shield tunnel lining structures assembled with high-strength bolts are widely used in practical projects due to their advantages such as convenient construction, good integrity, and clear stress distribution. However, these lining structures are quite sensitive to changes in surrounding environmental conditions during long-term operation, especially when affected by external factors such as adjacent foundation pit excavation, surface overloading, and groundwater level fluctuations, which can easily lead to a series of structural defects. These defects mainly include: excessive deformation of the lining structure, crack propagation, joint opening, misalignment, and water or even sediment leakage. If effective reinforcement measures are not taken in a timely manner, not only will the overall load-bearing capacity of the tunnel structure be weakened, but it may also endanger the structural safety and traffic safety of the tunnel, and in severe cases, even affect the normal operation of the entire transportation system. To ensure the safe and stable operation of shield tunnels and improve their adaptability and durability under complex geological conditions and external loads, it is particularly important to carry out necessary structural reinforcement for shield tunnels with damage or performance degradation. Through appropriate reinforcement methods, the load-bearing capacity and overall stiffness of damaged tunnels can be effectively restored or improved, crack development can be controlled, the risk of water leakage can be reduced, and the service life of the structure can be extended. Currently, the most commonly used shield tunnel reinforcement methods in engineering practice include fiber optic reinforcement, which involves bonding carbon fiber reinforced polymer (CFRP) or other high-performance fiber materials to the inner surface of the tunnel segments to enhance the structure's bending and shear resistance. Its advantages include simple construction, light weight, and no change to the original structural dimensions. However, it suffers from drawbacks such as susceptibility to environmental influences in bonding with the concrete substrate, insufficient long-term durability, and limited reinforcement effectiveness.

[0024] like Figures 1-5 As shown, a shield tunnel segment reinforcement structure using corrugated steel plate and UHPC includes a tunnel segment 1, a steel plate 2 installed at the lower end of the tunnel segment 1, and ultra-high performance concrete 7 between the inner side of the tunnel segment 1 and the steel plate 2. The steel plate 2 is composed of multiple corrugated units 201 arranged side by side, and multiple sets of welding studs 6 are welded to the upper part of the inside of the steel plate 2 to connect the steel plate 2 and the ultra-high performance concrete 7.

[0025] Multiple sets of grouting holes 4 are opened on the lower surface of the steel plate itself 2, and multiple sets of anchor bolt installation holes 3 are opened near the edge of the lower surface of the steel plate itself 2, which facilitates the filling of ultra-high performance concrete 7 (UHPC) into the interior, ensuring the integrity of the structure and the bonding strength, and facilitating the firm connection of the reinforced steel plate to the original pipe segment through anchor bolts, thereby enhancing the structural stability. The steel plate itself 2 is made of a specific corrugated unit 201 using an integral molding technology. Adjacent steel plates themselves 2 are connected by welding or connectors to improve the strength and rigidity of the steel plate, while ensuring structural consistency and manufacturing efficiency. The corrugated arrangement direction of the steel plate itself 2 is arranged radially along the pipe segment itself 1, and there is a certain distance between the pipe segment itself 1 and the steel plate itself 2, which optimizes the stress distribution and reserves space to facilitate the filling of UHPC and the formation of an effective reinforcement layer.

[0026] First, the deformation of the tunnel segments is measured, and the structural safety is assessed based on the measurement results. The degree of damage is determined by considering whether the tunnel segments exhibit cracking, misalignment, joint opening, segment ring deformation, water leakage at joints, or mud and sand leakage. This determines whether the assessed section suffers minor or severe damage. Based on the assessment results, an appropriate tunnel segment reinforcement scheme is selected, and the required reinforcement stiffness is determined. Secondly, based on the determined reinforcement stiffness, the thickness of the UHPC layer is further determined, and then corrugated units 201 are fabricated. According to actual needs, grouting holes 4 and welding studs 6 are pre-set on the steel plate. The corrugated units 201 of the steel plate itself 2 are arranged radially, and their arc surface is consistent with the inner arc surface of the shield tunnel segment to ensure a tight fit. Thirdly, oil stains, mud, and other impurities on the inner surface of the tunnel segment are cleaned and appropriately ground to improve the adhesion between the subsequent reinforcement layer and the substrate. Fourthly, concrete crack repair adhesive is used to repair cracks on the inner surface of the segment, sealing the cracks and improving the overall integrity and durability of the structure. Fifthly...

[0027] Please see Figures 3-4 Multiple sets of anchor bolt installation holes 3 are equipped with anchor bolt bodies 5 that connect the segment 1 and the steel plate 2, achieving reliable anchoring between the reinforced structure and the original structure and improving collaborative work capability. Multiple grouting holes 4 are reserved at equal intervals on the steel plate 2. The steel plate 2 is filled with ultra-high performance concrete 7 through the grouting holes 4 to ensure uniform filling of UHPC, avoid void defects, improve reinforcement effect and construction quality. The ultra-high performance concrete 7 is tightly bonded to the segment 1 and the corrugated steel plate 2 through welding studs 6 and grouting holes 4, enhancing the interfacial bonding performance between different materials, preventing peeling, and improving structural durability. The surface of the steel plate 2 is sprayed with an anti-corrosion polyurethane coating, which effectively improves the corrosion resistance of the steel plate in complex environments and extends its service life.

[0028] Fifth, construction is carried out according to the size of the reinforcement area, and anchor bolt drilling is performed on the tunnel segment concrete. In step five, a tunnel assembly trolley is used to assemble the steel plate itself 2. The steel plate itself 2 used for reinforcement has pre-set anchor bolt installation holes 3. The tunnel segment concrete is positioned and drilled according to the location of the anchor bolt holes. To ensure the connection effect between the steel plate itself 2 and the tunnel segment concrete, the bolt spacing should be reasonably set. During the drilling process, the internal steel reinforcement of the concrete should be avoided. At the same time, it should be ensured that the depth and diameter of the bolt holes meet the relevant specifications. After completing the drilling operation corresponding to one steel plate itself 2, the anchor bolts are then used. The steel plate itself 2 is fixed to the tunnel segment concrete by anchor bolts. Then, the remaining steel plates themselves 2 are assembled in the same way. Sixth, the connection between the steel plate itself 2 and the tunnel segment concrete is achieved by anchor bolts. Adjacent steel plate units are connected by welding or connectors to ensure the continuity and stability of the overall structure. Seventh, ultra-high performance concrete 7 is poured into the gap between the steel plate itself 2 and the tunnel segment concrete. Specifically, the grouting is uniformly filled by a grouting robot arm through the pre-set grouting holes 4 on the steel plate itself 2. The grout used is ultra-high performance concrete 7 to ensure that the two are tightly bonded to form an integral load-bearing structure.

[0029] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A shield tunnel segment reinforcement structure using corrugated steel plates and UHPC, characterized in that, It includes a pipe segment itself (1), a steel plate itself (2) installed at the lower end of the pipe segment itself (1), ultra-high performance concrete (7) is provided between the inner side of the pipe segment itself (1) and the steel plate itself (2), the steel plate itself (2) is composed of multiple corrugated units (201) arranged side by side, and multiple sets of welding studs (6) are welded to the upper part of the inside of the steel plate itself (2) to connect the steel plate itself (2) and the ultra-high performance concrete (7).

2. The shield tunnel segment reinforcement structure using corrugated steel plates and UHPC as described in claim 1, characterized in that, Multiple sets of grouting holes (4) are opened on the lower surface of the steel plate (2), and multiple sets of anchor bolt installation holes (3) are opened on the lower surface of the steel plate (2) near the edge.

3. The shield tunnel segment reinforcement structure using corrugated steel plates and UHPC as described in claim 1, characterized in that, The steel plates themselves (2) are all made of corrugated units (201) using a one-piece molding technology, and adjacent steel plates themselves (2) are connected by welding or connectors.

4. The shield tunnel segment reinforcement structure using corrugated steel plates and UHPC as described in claim 1, characterized in that, The corrugated arrangement of the steel plate itself (2) is arranged radially along the segment itself (1), and there is a certain distance between the segment itself (1) and the steel plate itself (2).

5. A shield tunnel segment reinforcement structure using corrugated steel plates and UHPC according to claim 2, characterized in that, The multiple sets of anchor bolt installation holes (3) are equipped with anchor bolt bodies (5) that connect the segment itself (1) and the steel plate itself (2).

6. The shield tunnel segment reinforcement structure using corrugated steel plates and UHPC according to claim 1, characterized in that, Multiple grouting holes (4) are reserved at equal intervals on the steel plate itself (2), and the steel plate itself (2) is filled with ultra-high performance concrete (7) through the grouting holes (4).

7. A shield tunnel segment reinforcement structure using corrugated steel plates and UHPC as described in claim 1, characterized in that, Ultra-high performance concrete (7) is tightly bonded to the segment itself (1) and the corrugated steel plate itself (2) through weld studs (6) and grouting holes (4).

8. A shield tunnel segment reinforcement structure using corrugated steel plates and UHPC according to claim 1, characterized in that, The steel plate itself (2) is coated with a corrosion-resistant polyurethane coating.

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