Tunnel connecting structure with anti-corrosion function

Abstract

The utility model discloses a tunnel connection structure with an anti-corrosion function. The tunnel connection structure solves the problems that in the prior art, the connection position of a connection channel and a main tunnel is poor in anti-corrosion performance and durability. The tunnel connecting structure with the anti-corrosion function comprises a connecting channel pipe piece and a main tunnel pipe piece, a multi-cavity type supporting plate assembly is fixedly arranged at the connecting position of the connecting channel pipe piece and the main tunnel pipe piece, and inorganic filling materials are filled in the multi-cavity type supporting plate assembly. The surface of the steel plate of the multi-cavity type supporting plate assembly is subjected to anti-corrosion treatment, the multi-cavity type supporting plate assembly serves as a reinforcing piece between the main tunnel segment and the connecting channel segment, the problem that the anti-corrosion performance of the lining segment at the connecting position of the connecting channel and the main tunnel is poor is solved, and the stability of the connecting structure is improved. According to the utility model, the purpose of preventing the long-term corrosion of the pipe piece at the end of the connecting channel is achieved, the structural stress requirement and the waterproof requirement are met, the use of steel materials is reduced, and the economic cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of communication channel construction, in particular to a communication channel connection structure. Background Art

[0002] When the main tunnel connecting passage portal is excavated, the forces on the portal and nearby segments change dramatically due to the loads of equipment cutting, pushing, and breaking the portal portal, which can easily affect the stability of the portal and nearby main tunnel segments. The excavation of the connecting passage between the two main tunnels is usually carried out after the construction of the main tunnel in the section where the connecting passage is located is completed. However, water leakage and corrosion in tunnels are relatively common. To ensure construction quality and safety, special attention should be paid to preventing water leakage and corrosion at the connection points of the segments, especially in the connecting sections. In existing shield tunnels, mechanical construction of connecting passages often uses all-steel segments and all-concrete segments. All-steel segments are expensive and prone to corrosion, while all-concrete segments are easily damaged and have low rigidity.

[0003] In the prior art, for example, Chinese patent application number CN202221209871.0 discloses a waterproof and leak-proof connection device for connecting a connecting channel and a main tunnel. This device uses a quick-setting inorganic leak-proof material and L-shaped angle steel as a waterproof line at the connection port to prevent leakage and other problems at the interface. Although it can achieve a waterproofing effect, the steel is easily corroded by the action of groundwater and soil, and the leak-proof material will age and leak over time, making the overall sealing structure less than ideal in terms of corrosion resistance. Chinese patent application number CN202222162455.6 discloses a waterproofing system for the portal structure at the interface between a connecting channel and a tunnel using a shield method. This system achieves a waterproofing effect by pre-embedding a water-stopping polystyrene plate at the portal connection point, injecting a film-dissolving agent to form a cavity, and then injecting liquid-expanded rubber to act as a waterstop. However, due to factors such as construction errors, the cavity is small, resulting in poor waterstop formation by the grouting material, which easily affects the overall waterproofing and anti-corrosion effect. Utility Model Content

[0004] In view of the deficiencies in the above-mentioned background technology, the present invention proposes a tunnel connection structure with anti-corrosion function, which solves the problems of poor corrosion resistance and durability at the connection point between the connecting channel and the main tunnel in the prior art.

[0005] The technical solution of the present utility model is achieved by providing a tunnel connection structure with corrosion resistance, comprising a connecting channel segment and a main tunnel segment. A multi-cavity support plate assembly filled with an inorganic filler is fixedly mounted at the connection between the connecting channel segment and the main tunnel segment. The steel plate surface of the multi-cavity support plate assembly is treated for corrosion resistance. The multi-cavity support plate assembly serves as a reinforcement between the main tunnel segment and the connecting channel segment, thereby resolving the problem of poor corrosion resistance of the lining segments at the connection between the connecting channel and the main tunnel, and improving the stability of the connection structure.

[0006] It is further preferred that the multi-cavity support plate assembly is located at the end of the connecting channel segment and on the side corresponding to the main tunnel segment door surface; a waterproof plugging filler is provided at the connection between the outer side of the connecting channel segment and the main tunnel segment; and a grouting hole is provided on the multi-cavity support plate assembly.

[0007] Further preferably, the main tunnel segment comprises an inner edge steel structure and a concrete shell covering the outer side of the inner edge steel structure, and the outer edge of the multi-cavity support plate assembly is connected to the connecting end face of the inner edge steel structure. The concrete shell is fixed to the inner edge steel structure by anchor bars or bolts.

[0008] Further preferably, the connecting channel segment comprises an inner ring steel structure and an outer concrete shell covering the inner ring steel structure. The end surface of the inner ring steel structure located within the main tunnel segment forms a connecting end surface, and the side edges of the multi-cavity support plate assembly are connected to the connecting end surface of the inner ring steel structure. The multi-cavity support plate assembly is connected to the end of the inner ring steel structure via fixing bolts.

[0009] Further preferably, the multi-cavity support plate assembly is a steel plate structure comprising N steel plate members forming N-1 cavities, where N ≥ 2. Inorganic material is injected into the multiple cavities formed by the multi-cavity support plate assembly to form a sealed space that is isolated from the outside world, significantly improving the corrosion resistance of the connection structure.

[0010] Further preferably, the steel plate includes an inner steel plate and an outer steel plate, the inner steel plate is fixed to the connecting end face of the connecting channel segment and connected to the main tunnel segment; the outer steel plate is an L-shaped steel plate, and the two ends of the L-shaped steel plate are respectively connected to the connecting channel segment and the main tunnel segment.

[0011] Further preferably, an intermediate steel plate is provided between the inner steel plate and the outer steel plate, and both ends of the intermediate steel plate are respectively connected to the outer steel plate and the main tunnel segment.

[0012] It is further preferred that, in order to achieve a better sealing effect, water stop strips are provided at the connections between the steel plate and the connecting channel segments and the main tunnel segments; these strips play a role of water isolation and corrosion prevention together with the filling material in the cavity.

[0013] The beneficial effects of the present invention are as follows: the pipe segments at the connection between the connecting channel and the main tunnel of the present invention adopt composite pipe segments to improve the corrosion resistance of the pipe segments at the connection; the steel plate surface of the multi-cavity support plate assembly is treated with corrosion resistance, and multi-layer steel plate welding is used as a reinforcement for the welding of the main tunnel pipe segments and the connecting channel, which are respectively welded and fixed to the inner cavity of the steel pipe section and the main tunnel pipe segments to form multiple cavities; inorganic materials are injected into the cavity to form a closed space isolated from the external space; the corrosion resistance is further improved, and at the same time, the stability and durability of the connection structure between the connecting channel and the main tunnel are improved. This connection structure can not only ensure the waterproof performance and structural stability of the joint, but also ensure that even if the concrete on the outside of the pipe segment is completely corroded, the main steel structure part can still support the structural stress. By providing multiple steel plates and grouting holes thereon, a simple and convenient grouting path is provided for the grouting process during the construction process.

[0014] The tunnel connection structure of the present invention utilizes designs such as welding multiple layers of sealing steel plates, filling the steel plate cavities with inorganic materials, filling the joints with waterproof and leak-proof materials, and the outer concrete shells of the two segments to fully cover the structure within the connection range with a protective layer. The above-mentioned connection structure can not only ensure the waterproof performance and structural stability of the joints, extend the service life of the connecting channel, and ensure the safety of the long-term use of the connecting channel; at the same time, it reduces the use of steel materials that are susceptible to corrosion and improves the economic benefits of the structure. Therefore, the present invention not only achieves the purpose of preventing long-term corrosion of the connecting channel end segments, but also meets the structural force requirements and waterproof requirements, while reducing the use of steel materials and reducing economic costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 This is a schematic diagram of the overall structure of the connecting section of the communication channel;

[0017] Figure 2 This is a schematic diagram of the upper structure of the connecting section of the communication channel;

[0018] Figure 3 This is a schematic diagram of the lower structure of the connecting section of the communication channel;

[0019] Figure 4 Schematic diagram of the main tunnel segment structure;

[0020] Figure 5 Schematic diagram of the connecting channel segment structure. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that the terms "vertical", "lateral", "up", "down", "front", "back", "left", "right", "horizontal", "top", "bottom", "inside" and "outside" and the like to indicate directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0023] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art can understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0024] like Figure 1 As shown, Example 1, a tunnel connection structure with corrosion resistance, includes a connecting channel segment 1 and a main tunnel segment 2. A multi-cavity support plate assembly 6 is fixedly provided at the connection between the connecting channel segment 1 and the main tunnel segment 2. The multi-cavity support plate assembly 6 is filled with an inorganic filler material 7. The segments at the connection between the connecting channel and the main tunnel are composite segments to improve the corrosion resistance of the segments at the connection. The steel plate surface of the multi-cavity support plate assembly is treated for corrosion resistance. Multiple layers of steel plates are welded together as reinforcements for the main tunnel segments and the connecting channel. These are welded to the inner cavities of the steel pipe sections and the main tunnel segments, forming multiple cavities. Inorganic material is injected into the cavities to form enclosed spaces that are isolated from the outside. This further improves the corrosion resistance and the stability and durability of the connecting channel and main tunnel structure.

[0025] The multi-cavity support plate assembly 6 described in this embodiment is located at the end of the connecting channel segment 1 and on the side corresponding to the portal of the main tunnel segment 2; that is, the multi-cavity support plate assembly 6 is arranged at the connection between the connecting channel segment 1 and the main tunnel segment 2 to ensure the stability of the connection structure. A waterproof plugging filler 3 is provided at the connection between the outer side of the connecting channel segment 1 and the main tunnel segment 2; that is, plugging material is injected on the outer side of the connection between the main tunnel segment and the connecting channel segment so that it is wrapped around the outside of the joint to form a good protective barrier to isolate the corrosion and penetration of underground water and soil, and enhance the waterproof and corrosion resistance of the joint. In this embodiment, a grouting hole 4 is provided on the multi-cavity support plate assembly 6; the grouting hole is used to inject inorganic material into the cavity formed by the double-layer sealing plate. The good engineering properties of the inorganic material use the cavity layer as a waterproof and anti-corrosion defense line at the tunnel connection, thereby improving the corrosion resistance of the structural connection. The inorganic material can also be replaced with a concrete grouting filling material of similar strength.

[0026] like Figure 4 、 5 As shown, Example 2 is a tunnel connection structure with corrosion resistance. Based on Example 1, the main tunnel segment 2 in this embodiment includes an inner edge steel structure 2-1 and a concrete shell 2-2 covering the outer side of the inner edge steel structure 2-1. The outer edge of the multi-cavity support plate assembly 6 is connected to the connecting end face of the inner edge steel structure 2-1. Preferably, the concrete shell 2-2 is fixed to the inner edge steel structure 2-1 via anchor bars or studs 8. This creates a steel-concrete composite segment, reducing the use of corrosion-prone steel materials and improving the structure's economic efficiency. The outer concrete structure not only improves corrosion resistance but also provides stable connection points (such as welds) for the multi-cavity support plate assembly 6, ensuring the stability and strength of the connection structure.

[0027] The connecting channel segment 1 described in this embodiment includes an inner ring steel structure 1-1 and an outer concrete shell 1-2 covering the inner ring steel structure 1-1, forming a steel-concrete composite segment. The outer concrete structure can also improve the corrosion resistance and provide a stable connection point (such as a welding point) for the multi-cavity support plate assembly 6, ensuring the stability and connection strength of the connection structure. The end face of the inner ring steel structure 1-1 located inside the main tunnel segment 2 forms a connecting end face, and the side edge of the multi-cavity support plate assembly 6 is connected to the connecting end face of the inner ring steel structure 1-1 to provide a welding point for the multi-cavity support plate assembly 6. The multi-cavity support plate assembly 6 is connected to the end of the inner ring steel structure 1-1 by a fixing bolt 5; it is bolted to the connecting channel segment to strengthen the connection strength of the middle part of the sealing steel plate.

[0028] Specifically, in this embodiment, the connecting channel uses an outer concrete-encased steel segment as the universal ring segment of the connecting channel, and the main tunnel uses an outer concrete-encased lining segment as the connecting segment with the connecting channel. This is applied to the connection location between the connecting channel and the main tunnel to ensure the connection strength and durability between the connecting channel and the main tunnel. The outer side of the main tunnel segment at the connection location is a thin layer of concrete covered with anchor bars or studs, thereby improving the corrosion resistance of the main tunnel segment. The steel structure near the inner edge port provides a welding point for the anti-corrosion sealing steel plate. Similarly, the connecting channel segment includes a composite segment of outer concrete and inner steel structure, which improves the corrosion resistance of the connecting channel segment. The steel structure segment can provide a welding point for the sealing steel plate. At the same time, bolt holes are arranged on one side of the welding point for tightening the connecting bolts to strengthen the connection strength between the sealing steel plate of the multi-cavity support plate assembly and the middle part of the connecting channel segment.

[0029] like Figure 2 、 3 As shown, Example 3 is a tunnel connection structure with anti-corrosion function. Based on Example 2, the multi-cavity support plate assembly 6 in this embodiment is a steel plate structure composed of N steel plates forming N-1 cavities, N≥2; in this embodiment, N=3 is taken as an example.

[0030] Specifically, the steel plates described in this embodiment include an inner steel plate 61, an outer steel plate 63, and an intermediate steel plate 62. The inner steel plate 61 is fixed to the connecting end face of the connecting channel segment 1 and connected to the main tunnel segment 2. The outer steel plate 63 is an L-shaped steel plate, with its ends connected to the connecting channel segment 1 and the main tunnel segment 2, respectively, to form a sealed cavity structure. The intermediate steel plate 62 is connected to the outer steel plate 63 and the main tunnel segment 2 at both ends. These steel plates are welded between the inner ring steel structure 1-1 of the connecting channel segment and the inner edge steel structure 2-1 of the main tunnel segment to form multiple cavities. In other words, the connecting channel segment and the main tunnel segment are securely connected by welding anti-corrosion sealing steel plates at the joint.

[0031] To further achieve a better sealing effect, waterstop strips are provided at the connections between the steel plates and the connecting channel segments 1 and the main tunnel segments 2. That is, water-swelling waterstop strips can be added at the connections between the steel plates, and together with the filling material in the cavity, they play a role in water isolation and corrosion prevention.

[0032] The specific construction process of this embodiment is as follows: define the first layer of steel plate as the inner steel plate, the second layer of steel plate as the middle steel plate, and the third layer of steel plate as the outer steel plate. First, the tunnel boring machine completes the opening of the tunnel portal and assembles the connecting channel steel segments. After the connecting channel segments are assembled, the first layer of anti-corrosion steel plate is fixed to the gap between the main tunnel segments and the connecting channel segments, and welded to the fixed welding points respectively. The anti-corrosion steel plate is a three-layer structure. After the second layer of steel plate is welded, a cavity is formed between the first and second layers of steel plates. Insert the fixing bolts into the bolt holes of the anti-corrosion steel plates to strengthen the connection strength between the middle part of the cavity formed by the steel plate and the segments.

[0033] The first layer of welded steel plates is provided with grouting holes, through which plugging materials are continuously injected to the outside of the joint section to fill it with dense soil, forming a protective barrier on the outside of the joint section to isolate the underground water and soil environment, avoiding direct contact between the steel plate and the concrete outer shell with air, water and soil, and enhancing the waterproof and corrosion resistance of the joint.

[0034] Finally, the third layer of steel plates is welded, forming an L-shaped cross-section. One side is welded to the steel structure of the main tunnel segment, and the other side is welded to the connecting channel segment. This complete ring of multi-layered, corrosion-resistant steel plates serves as the portal ring beam for the connecting channel, bearing the load as a permanent component of the secondary lining. Similarly, inorganic material is continuously injected into the two cavities formed by the first, second, and third layers of corrosion-resistant steel plates through grouting holes, completely isolating the internal and external spaces. At this point, the connection between the main tunnel and connecting channel segments, as well as the areas in contact with the soil, are covered with inorganic and leak-proof materials. The resulting portal ring beam greatly improves the structure's waterproofness and corrosion resistance.

[0035] In summary, by welding multiple layers of sealing steel plates, filling the steel plate cavities with inorganic materials, filling the joints with waterproof and leak-proof materials, and the outer concrete shells of the two pipe segments, the structure within the joint range is fully covered with a protective layer. Therefore, the above-mentioned connection structure can not only ensure the waterproof performance and structural stability of the joints, extend the service life of the communication channel, and ensure the safety of the long-term use of the communication channel; at the same time, it reduces the use of steel materials that are susceptible to corrosion and improves the economic benefits of the structure. The utility model not only achieves the purpose of preventing long-term corrosion of the pipe segments at the end of the communication channel, but also meets the structural force requirements and waterproof requirements, while reducing the use of steel materials and reducing economic costs.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A tunnel connection structure with anti-corrosion function, characterized by: The invention comprises a connecting channel segment (1) and a main tunnel segment (2), wherein a multi-cavity support plate assembly (6) is fixedly provided at the connection between the connecting channel segment (1) and the main tunnel segment (2), and the multi-cavity support plate assembly (6) is filled with an inorganic filling material (7).

2. The tunnel connection structure with anti-corrosion function according to claim 1, characterized in that: The multi-cavity support plate assembly (6) is located at the end of the connecting channel segment (1) and on a side corresponding to the portal surface of the main tunnel segment (2); a waterproof plugging filler (3) is provided at the connection between the outer side of the connecting channel segment (1) and the main tunnel segment (2); and a grouting hole (4) is provided on the multi-cavity support plate assembly (6).

3. The tunnel connection structure with corrosion resistance according to claim 1 or 2, characterized in that: The main tunnel segment (2) comprises an inner edge steel structure (2-1) and a concrete shell (2-2) covering the outer side of the inner edge steel structure (2-1); the outer edge of the multi-cavity support plate assembly (6) is connected to the connecting end face of the inner edge steel structure (2-1).

4. The tunnel connection structure with corrosion resistance according to claim 3, characterized in that: The concrete shell (2-2) is fixed to the inner edge steel structure (2-1) via anchor bars or bolts (8).

5. The tunnel connection structure with corrosion resistance according to claim 1 or 4, characterized in that: The connecting channel segment (1) comprises an inner ring steel structure (1-1) and an outer concrete shell (1-2) covering the inner ring steel structure (1-1); the end face of the inner ring steel structure (1-1) located inside the main tunnel segment (2) forms a connecting end face; and the side edge of the multi-cavity support plate assembly (6) is connected to the connecting end face of the inner ring steel structure (1-1).

6. The tunnel connection structure with corrosion resistance according to claim 5, characterized in that: The multi-cavity support plate assembly (6) is connected to the end of the inner ring steel structure (1-1) via fixing bolts (5).

7. The tunnel connection structure with corrosion resistance according to claim 1 or 6, characterized in that: The multi-cavity support plate assembly (6) is a steel plate structure formed by N steel plate members with N-1 cavities, where N is greater than or equal to 2.

8. The tunnel connection structure with corrosion resistance according to claim 7, characterized in that: The steel plate member comprises an inner steel plate (61) and an outer steel plate (63); the inner steel plate (61) is fixed to the connecting end face of the connecting channel segment (1) and is connected to the main tunnel segment (2); the outer steel plate (63) is an L-shaped steel plate, and the two ends of the L-shaped steel plate are respectively connected to the connecting channel segment (1) and the main tunnel segment (2).

9. The tunnel connection structure with anti-corrosion function according to claim 8, characterized in that: An intermediate steel plate (62) is further provided between the inner steel plate (61) and the outer steel plate (63), and both ends of the intermediate steel plate (62) are respectively connected to the outer steel plate (63) and the main tunnel segment (2).

10. The tunnel connection structure with corrosion resistance according to claim 8 or 9, characterized in that: Waterstop strips are provided at the connections between the steel plate members and the connecting channel segments (1) and the main tunnel segments (2).

Images