Compression-resistant steel sleeve for tunnel shield in frozen soil environment

Abstract

The utility model relates to tunnel engineering technical field discloses a kind of compression-resistant steel sleeve for tunnel shield in frozen soil environment, the steel sleeve includes shell, and the compression-resistant mechanism fixed in the inside of shell;The compression-resistant mechanism is by inner shell, steel plate brush, honeycomb framework and multiple rubber elastic blocks in order, steel plate brush is coaxially sleeved in the outside of inner shell, honeycomb framework is covered and fixed in the outside of steel plate brush, and the grid cavity in honeycomb framework is filled;The outer circumferential end of shell is fixedly connected with multiple sawtooth pressing blocks, its end face is provided with sealing groove, and sealing ring is embedded in the sealing groove.The utility model is through the rigid support of honeycomb framework and the flexible buffering of rubber elastic block Synergistic effect, it is composed of the compound compression-resistant layer of rigidity and flexibility, effectively solve the problem that single rigid structure of existing is difficult to adapt frozen soil dynamic frost heaving pressure, easily damaged;Meanwhile, the structural design of sawtooth pressing block and sealing ring ensures the connection stability and sealing reliability under low temperature and settlement displacement environment.

Description

Technical Field

[0001] This utility model relates to the field of tunnel engineering technology, and in particular to a pressure-resistant steel sleeve for tunnel shields in permafrost environments. Background Technology

[0002] Tunnel boring machine (TBM) construction in permafrost regions is a major challenge in modern engineering. As a key support structure in the initial stage of tunneling, the steel sleeve needs to directly bear and resist the complex loads from the surrounding permafrost environment, and its structural performance is directly related to the safety and stability of the entire tunnel project.

[0003] One of the most significant physical properties of permafrost is its ability to undergo "frost heave" and "thaw settlement" with temperature changes. Especially under construction disturbances, this volume change generates enormous and dynamically changing compressive stress, known as frost heave force. This force is not only massive in magnitude but also unevenly distributed and variable in direction, posing a continuous and severe challenge to tunnel support structures.

[0004] Currently, conventional tunnel steel sleeves mostly adopt a single rigid structural design, relying on the high strength of the material itself to rigidly resist external pressure. However, this purely rigid structure reveals significant shortcomings when faced with the enormous dynamic frost heave force of frozen soil. Due to the lack of effective buffering and unloading mechanisms, the structure directly bears the entire impact, leading to high stress concentration. Over time, this concentrated stress can easily cause fatigue damage to the material, and even brittle fracture under extreme pressure, thus failing to effectively adapt to the dynamic changes in frozen soil pressure and posing serious safety hazards to the tunnel structure.

[0005] Therefore, this utility model proposes a pressure-resistant steel sleeve for tunnel shields in permafrost environments to overcome the shortcomings of existing technologies. Utility Model Content

[0006] In view of the problems of existing compression-resistant steel sleeves for tunnel shields in permafrost environments, which are unable to effectively adapt to the dynamic frost heave pressure of permafrost due to their simple rigid structure and lack of buffering mechanism, and are prone to stress concentration and damage, this utility model aims to provide a compression-resistant steel sleeve for tunnel shields in permafrost environments with an improved structure that can effectively solve the above problems.

[0007] This utility model provides a pressure-resistant steel sleeve for tunnel shields in permafrost environments, comprising: an outer shell; a pressure-resistant mechanism fixedly connected inside the outer shell; a plurality of serrated pressure blocks fixedly connected to the outer periphery of the outer shell; and a sealing ring disposed on the end face of the outer shell.

[0008] The pressure-resistant mechanism has a multi-layered composite structure, including an inner shell, a steel plate brush, a honeycomb skeleton, and multiple rubber elastic blocks.

[0009] Furthermore, the steel plate brush is coaxially sleeved on the outside of the inner shell, the honeycomb skeleton is covered and fixed to the outside of the steel plate brush, and the outer wall of the honeycomb skeleton is abutted and fixed to the inner wall of the outer shell. Multiple rubber elastic blocks are filled in the grid cavity inside the honeycomb skeleton. Multiple serrated pressure blocks are fixedly connected to the outer periphery of the outer shell by welding or bolts. At the same time, a sealing groove is opened on the end face of the outer shell, and the sealing ring is embedded in the sealing groove.

[0010] Preferably, the sealing groove has a double-groove stepped structure.

[0011] Preferably, the serrated blocks are evenly distributed along the circumference of the outer shell.

[0012] Preferably, the honeycomb skeleton is a regular hexagonal mesh structure.

[0013] Preferably, as a specific implementation, the rubber elastic block is a hexagonal prism structure adapted to the regular hexagonal grid structure.

[0014] Preferably, the sealing ring is made of low-temperature resistant rubber material.

[0015] Preferably, the steel plate brush is tightly fitted to the outer peripheral wall of the inner shell.

[0016] Preferably, the outer shell and the inner shell are coaxially arranged, and an annular hollow cavity is formed between them to accommodate the anti-compression mechanism.

[0017] This utility model has the following beneficial effects:

[0018] 1. This utility model solves the problem that existing steel sleeves are difficult to adapt to the dynamic frost heave pressure of frozen soil and are easily damaged due to stress concentration by setting a composite anti-compression mechanism between the outer shell and the inner shell, which is rigidly supported by a honeycomb skeleton and flexibly buffered by rubber elastic blocks. It achieves the technical effect of combining rigidity and flexibility and dynamic pressure bearing, and significantly improves the compressive strength and stability of the overall structure.

[0019] 2. This utility model solves the industry pain point that existing sealing structures are prone to embrittlement and failure in low-temperature environments and cannot compensate for the settlement displacement of frozen soil, resulting in leakage at the joint, by setting a serrated pressure block and a double-groove stepped sealing groove embedded with a low-temperature resistant elastic sealing ring. It achieves the technical effect of stable connection, reliable sealing and dynamic compensation for displacement, and greatly improves the waterproof safety of tunnel structures.

[0020] 3. This utility model has an ingenious overall structural design that highly integrates multiple functions such as pressure resistance, buffering, connection, and sealing. The layers are distinct, and the components work together to effectively solve the core technical problems in the frozen soil environment. Moreover, it has a compact structure, high reliability, and strong engineering practical value. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of a compression-resistant steel sleeve for tunnel shields in permafrost environments proposed in this utility model.

[0022] Figure 2 This is a schematic diagram of the inner shell of a pressure-resistant steel sleeve for tunnel shields in permafrost environments, as proposed in this utility model.

[0023] Figure 3 This is a schematic diagram of the honeycomb skeleton structure of a compression-resistant steel sleeve for tunnel shields in permafrost environments proposed in this utility model.

[0024] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0025] Legend:

[0026] 1. Outer shell; 2. Pressure-resistant mechanism; 21. Inner shell; 22. Honeycomb skeleton; 23. Rubber elastic block; 24. Steel plate brush; 25. Sealing ring; 26. Serrated pressure block. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Example

[0029] Please refer to Figures 1 to 4 This utility model provides a pressure-resistant steel sleeve for tunnel shields in permafrost environments, which aims to solve the problems of existing steel sleeves having strong rigidity and weak buffering capacity, making it difficult to adapt to the dynamic frost heave pressure of permafrost, and the sealing structure being prone to failure due to material embrittlement and structural displacement in low-temperature environments.

[0030] like Figures 1 to 4As shown, the compression-resistant steel sleeve for tunnel boring machines in the permafrost environment includes an outer shell 1 and a compression-resistant mechanism 2 fixedly connected inside the outer shell 1. The outer shell 1 serves as the outermost basic protective layer of the overall structure, providing the first safety barrier for the internal structure. The compression-resistant mechanism 2 is used to undertake the functions of internal protection, load bearing, and buffering. The compression-resistant mechanism 2 is coaxially arranged with the outer shell 1, forming an annular hollow cavity between them to accommodate the compression-resistant mechanism 2. The compression-resistant mechanism 2 specifically includes an inner shell 21, steel plate brushes 24, a honeycomb skeleton 22, and multiple rubber elastic blocks 23. The inner shell 21 serves as the inner load-bearing structure of the compression-resistant mechanism 2, and the steel plate brushes... 24 is tightly fitted and coaxially sleeved on the outer peripheral wall of the inner shell 21. The honeycomb skeleton 22 covers and is fixed to the outside of the steel plate brush 24, and the outer wall of the honeycomb skeleton 22 abuts and is fixed to the inner wall of the outer shell 1. Multiple rubber elastic blocks 23 are filled in the grid cavity inside the honeycomb skeleton 22, together constructing a composite middle layer structure of honeycomb skeleton 22 and elastic material. In addition, the steel sleeve also includes a structure for connection and sealing. Multiple serrated pressure blocks 26 are fixedly connected to the outer peripheral end of the outer shell 1 by welding or bolt connection. At the same time, a sealing groove is opened on the end face of the outer shell 1, and the sealing ring 25 is embedded in the inside of the sealing groove.

[0031] To solve the above-mentioned technical problems, the core of the technical solution of this embodiment lies in the specific structural cooperation and connection relationship formed between the sub-components inside the anti-pressure mechanism 2 and the external sealing assembly of the outer shell 1. The technical solution or technical feature needs to be described in detail and expressed logically. The technical features should not be described in a brief manner or omitted, so as to avoid the problem of insufficient disclosure during the patent examination process.

[0032] Please refer to the following carefully. Figure 3 and Figure 4 The core structure is described in detail below: The honeycomb skeleton 22 in the pressure-resistant mechanism 2 has a regular hexagonal grid structure. The honeycomb skeleton 22 is covered and fixed to the outside of the steel plate brush 24 and abuts against the inner wall of the outer shell 1. Its function is to act as a rigid support skeleton to evenly distribute the external frozen soil pressure to resist concentrated stress. At the same time, multiple rubber elastic blocks 23 are correspondingly set as hexagonal prism structures adapted to the regular hexagonal grid structure. In the assembled state, each rubber elastic block 23 is filled in the grid cavity of the honeycomb skeleton 22. When subjected to external pressure, the rubber elastic block 23 undergoes elastic deformation to absorb and buffer energy. This composite structure of rigidity and flexibility of the honeycomb skeleton 22 and rubber elastic blocks 23 ensures the dynamic adaptability and structural stability of the steel sleeve when subjected to huge frost heave forces.

[0033] Please refer to the following carefully. Figure 4To further address the connection and sealing issues in low-temperature environments, the outer periphery of the outer casing 1 is fixedly connected with multiple serrated pressure blocks 26 evenly spaced along its circumference by welding or bolting. The serrated structure of the pressure blocks 26 enhances the mechanical locking force when connected to other tunnel segments, preventing loosening of the connection due to vibration or temperature changes. Simultaneously, a double-groove stepped sealing groove is provided on the end face of the outer casing 1. This sealing groove provides an installation base with elastic compensation space for the sealing ring 25. The sealing ring 25 is made of low-temperature resistant rubber material and is embedded in the double-groove stepped sealing groove. This structural design ensures that the sealing element maintains elasticity at low temperatures while effectively compensating for minor displacements caused by frozen soil settlement, fundamentally preventing sealing failure.

[0034] Based on the above embodiments, the present invention may further include the following preferred technical solutions:

[0035] As a preferred embodiment, to further clarify the structural hierarchy of the anti-compression mechanism 2, please refer to... Figure 2 and Figure 3 The steel plate brush 24 is closely attached to the outer peripheral wall of the inner shell 21. Its bristle-like or sheet-like metal structure plays a transition and filling role, ensuring that the force transmission between the inner shell 21 and the honeycomb skeleton 22 is more uniform and continuous.

[0036] As another preferred embodiment, to achieve the best sealing effect, please refer to... Figure 4 The enlarged view at point A shows the double-groove stepped sealing groove on the end face of the outer shell 1. Specifically, it consists of two annular grooves of different depths and widths arranged radially to form a stepped shape. The sealing ring 25 is embedded in the deeper groove. This design provides more deformation space for the compression and rebound of the sealing ring 25.

[0037] As one specific implementation, the honeycomb skeleton 22 is an integral regular hexagonal grid structure, and its material can be high-strength alloy steel to ensure sufficient rigidity and compressive strength.

[0038] As a specific implementation, the rubber elastic block 23 is a hexagonal prism structure adapted to the regular hexagonal grid structure. Its material is preferably low-temperature resistant and aging resistant EPDM rubber or silicone rubber to ensure that it maintains good elasticity and cushioning performance in the low-temperature environment of frozen soil.

[0039] As a specific implementation, in order to maximize connection reliability, the serrated pressure block 26 is fixedly connected at equal intervals along the circumference of the outer shell 1, with its serrated surface facing outward, for engaging and locking with adjacent tunnel segments or connectors.

[0040] As a specific implementation method, in order to ensure the integrity and stability of the structure, the outer shell 1 and the inner shell 21 are connected by bolts or welding at the end flanges to form an unremovable whole, thereby constituting an annular hollow cavity for accommodating the pressure-resistant mechanism 2.

[0041] The implementation principle of this application embodiment is as follows: When the steel sleeve is installed in a frozen soil environment and withstands the frost heave pressure of the external frozen soil, the pressure first acts on the outermost shell 1. The shell 1 transmits the pressure to the internal pressure-resistant mechanism 2. Inside the pressure-resistant mechanism 2, the pressure is first dispersed through the honeycomb skeleton 22. As a rigid support structure, the honeycomb skeleton 22 evenly distributes the concentrated pressure on its regular hexagonal grid, effectively avoiding structural damage caused by excessive local stress. At the same time, the rubber elastic block 23 filled inside the honeycomb skeleton 22 is compressed under pressure and undergoes elastic deformation. This deformation absorbs and buffers a large amount of frost heave energy, thereby protecting the inner shell 21. The steel plate brush 24 located between the inner shell 21 and the honeycomb skeleton 22 ensures that the force transmission between the two is stable and the contact is tight. Through the synergistic effect of the rigid support of the honeycomb skeleton 22 and the flexible buffer of the rubber elastic block 23, this utility model solves the problem that the existing rigid structure is difficult to adapt to the dynamic pressure of frozen soil.

[0042] In terms of structural connection and sealing, when the steel sleeve is connected to other segments, the serrated pressure block 26 fixed to the outer periphery of the outer shell 1 generates a strong mechanical meshing force with the connection surface of the adjacent components, which significantly improves the shear and torsional resistance of the connection and ensures the long-term stability of the connection. At the same time, the sealing ring 25 embedded in the double-groove stepped structure sealing groove on the end face of the outer shell 1 forms a reliable initial seal after the connection is tightened. When the frozen soil thaws and causes the structure to undergo slight displacement, the double-groove stepped structure provides additional elastic deformation space for the sealing ring 25, enabling it to effectively compensate for the displacement and maintain the sealing performance. Through this structural design, this utility model solves the problem that existing seals are prone to failure under the dual effects of low temperature and ground displacement.

Claims

1. A compression-resistant steel casing for use in a tunnel shield in a frozen ground environment, comprising a shell (1), characterised in that, It also includes a pressure-resistant mechanism (2) fixedly connected inside the outer shell (1); the pressure-resistant mechanism (2) includes an inner shell (21), a steel plate brush (24) coaxially sleeved outside the inner shell (21), a honeycomb skeleton (22) covering and fixed outside the steel plate brush (24), and a plurality of rubber elastic blocks (23) filling the internal grid cavity of the honeycomb skeleton (22). The outer wall of the honeycomb skeleton (22) abuts and is fixed to the inner wall of the outer shell (1); a plurality of sawtooth pressure blocks (26) are fixedly connected to the outer periphery of the outer shell (1) by welding or bolts, and a sealing groove is provided on the end face of the outer shell (1), and a sealing ring (25) is embedded in the sealing groove.

2. The compressive steel casing for tunneling shield in permafrost environment according to claim 1, characterized in that, The sealing groove has a double-groove stepped structure.

3. The compressive steel casing for tunneling shield in permafrost environment according to claim 1, characterized in that, The serrated blocks (26) are evenly distributed along the circumference of the outer shell (1).

4. The compression-resistant steel casing for tunneling shield in permafrost environment according to claim 1, characterized in that, The honeycomb skeleton (22) is a regular hexagonal grid structure.

5. The compression-resistant steel casing for tunneling shield in permafrost environment according to claim 4, characterized in that, The rubber elastic block (23) is a hexagonal prism structure adapted to the regular hexagonal grid structure.

6. The compression-resistant steel sleeve for tunnel shields in permafrost environments according to claim 1, characterized in that, The sealing ring (25) is made of low-temperature resistant rubber material.

7. The compression-resistant steel sleeve for tunnel shields in permafrost environments according to claim 1, characterized in that, The steel plate brush (24) is tightly attached to the outer peripheral wall of the inner shell (21).

8. The compression-resistant steel casing for tunneling shield in permafrost environment according to claim 1, characterized in that, The outer shell (1) and the inner shell (21) are coaxially arranged, and an annular hollow cavity is formed between them to accommodate the anti-pressure mechanism (2).

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