A connecting structure for tunnel shield segments

Abstract

The utility model discloses a kind of connecting structure for tunnel shield segment, for connecting tunnel shield segment, post-pouring hole door structure and inner lining wall;Including sealing connector, sealing connector includes special-shaped bolt, first connecting part and second connecting part are provided on special-shaped bolt, first connecting part and second connecting part are all provided with water-swelling rubber gasket.The utility model solves the problem that the connection of existing shield segment and inner lining wall is easily caused structural damage by the way of planting reinforcement, cannot guarantee full package airtight waterproof, by special-shaped bolt instead of existing planting reinforcement mode, for the irregular connecting surface of shield segment, hole door, special-shaped bolt can be designed into the structure with arc contact surface, positioning step directly and accurately fit with segment reserved hole, hole door embedded part.Structure is simple and realizes the effective connection of tunnel shield segment and existing structure and waterproof airtight effect, and it enriches the connecting mode between subway tunnel segment and existing structure.

Description

Technical Field

[0001] This utility model relates to the field of tunnel construction technology, specifically to a connection structure for tunnel shield segments. Background Technology

[0002] Due to the complex process connections and irregular structural interface forms between different construction methods, the interface between the shield tunnel segments and the existing structural lining wall cannot achieve effective connection and sealing waterproofing, which cannot guarantee the structural safety and durability requirements, and thus affects the long-term operational safety of the structure.

[0003] Currently, the common approach to addressing this issue is to install rebar at both the tunnel lining segments and the existing structural lining walls. However, this often leads to several problems: 1) The tunnel lining segments and existing structural lining walls are relatively thin, and large-area rebar installation can easily cause secondary damage to them, affecting the structural lifespan; 2) The post-cast portal structure is subject to complex stresses, dense rebar arrangement, and a narrow working surface, making large-area rebar installation and subsequent concrete pouring difficult, and making it hard to guarantee construction quality and rebar installation effectiveness; 3) The interface between the tunnel lining segments and the existing structural lining walls has irregular shapes and significant stress concentration. Large-area rebar installation can damage the overall structure, increase the number of fully enclosed and sealed waterproof leakage points, pose a structural leakage hazard, and thus weaken the structural operational durability and safe load-bearing capacity.

[0004] Therefore, this application is hereby submitted. Utility Model Content

[0005] The technical problem to be solved by this utility model is that the existing connection between shield tunnel segments and inner lining walls by rebar anchoring is prone to structural damage and cannot guarantee full sealing and waterproofing. The purpose is to provide a connection structure for tunnel shield tunnel segments.

[0006] This utility model is achieved through the following technical solution: A connection structure for tunnel shield segments is disclosed, used to connect tunnel shield segments, a post-cast portal structure, and an inner lining wall, wherein the post-cast portal structure is connected to the inner lining wall. The structure includes a sealing connector comprising a shaped bolt, the shape of which is respectively matched to the tunnel shield segment and the post-cast portal structure. The shaped bolt has a first connecting portion and a second connecting portion, the first connecting portion being used for fixed connection with the tunnel shield segment, and the second connecting portion being used for fixed connection with the post-cast portal. Both the first and second connecting portions are provided with water-swellable rubber gaskets.

[0007] As one of the preferred technical solutions, both the first connecting part and the second connecting part include a first nut and a first washer, wherein the first washer abuts against a water-swellable rubber gasket.

[0008] As one of the preferred technical solutions, the irregular bolt is provided with an end block at one end near the post-cast hole structure.

[0009] As one of the preferred technical solutions, a wedge-shaped opening is provided at the position where the tunnel shield segment abuts the water-swellable rubber gasket, and the water-swellable rubber gasket has a conical structure to abut and cooperate with the wedge-shaped opening.

[0010] As one of the preferred technical solutions, pre-embedded grouting pipes are provided between the post-cast portal structure and the tunnel shield segments, as well as between the post-cast portal structure and the inner lining wall.

[0011] As one of the preferred technical solutions, water-swellable sealing strips are provided at the gaps between the post-cast portal structure and the tunnel shield segments, as well as at the gaps between the post-cast portal structure and the inner lining wall.

[0012] As one of the preferred technical solutions, the inner lining wall is provided with pre-embedded connecting bars for connection with the post-cast portal structure.

[0013] As one of the preferred technical solutions, a shield tunnel portal embedded part is also connected to one side of the inner lining wall.

[0014] As one of the preferred technical solutions, the inner lining wall is pre-embedded with annular steel plates and anchor bars, the annular steel plates are welded to the anchor bars, and the annular steel plates are connected to the shield tunnel portal pre-embedded parts by bolt assemblies.

[0015] As one of the preferred technical solutions, the bolt assembly includes a double-ended stud, a second nut, and a nut, wherein the second nut is located on the side near the pre-embedded part of the shield tunnel portal, and the nut is located on the side near the annular steel plate.

[0016] Compared with the prior art, this utility model has the following advantages and beneficial effects: 1. Replace the existing rebar installation method with a sealed connection structure (including special-shaped bolts). For irregular connection surfaces of shield tunnel segments and portals (such as segment curvature and portal ring nodes), special-shaped bolts can be designed with arc-shaped contact surfaces and positioning steps to directly and accurately fit with the pre-reserved holes of the segments and the pre-embedded parts of the portal, avoiding the problem of "rebar misalignment" caused by construction errors in rebar installation.

[0017] 2. The structure is simple and achieves effective connection and waterproof sealing between tunnel shield segments and existing structures, enriching the connection methods between subway tunnel segments and existing structures. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings: Figure 1This is a schematic diagram of the structure of this utility model; Figure 2 This is a structural schematic diagram of the sealing connector of this utility model; Figure 3 This is a schematic diagram showing the positional relationship between the water-swellable rubber gasket of this utility model and the tunnel shield segment; Figure 4 This is a schematic diagram showing the connection between the annular steel plate and the embedded part of the shield tunnel portal of this utility model.

[0019] The attached diagram shows the markings and corresponding component names: 1-Irregular bolt, 2-Water-swellable rubber washer, 3-Water-swellable waterstop strip, 4-Ring steel plate, 5-Anchor bar, 6-Embedded connecting bar, 7-Embedded grouting pipe, 8-First nut, 9-First washer, 10-Double-ended stud, 11-End block, 12-Second nut, 13-Nut, 14-Wedge-shaped opening, 15-Post-cast ring beam reinforcement, 16-Tunnel shield segment, 17-Post-cast portal structure, 18-Inner lining wall, 19-Shield portal embedded part, 20-Second washer. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0021] Throughout this specification, references to "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with that embodiment or example is included in at least one embodiment of the invention. Therefore, the phrases "an embodiment," "an example," "an example," or "an example" appearing in various places throughout the specification do not necessarily refer to the same embodiment or example. Furthermore, specific features, structures, or characteristics can be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. Moreover, those skilled in the art will understand that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] In the description of this invention, the terms "front," "rear," "left," "right," "up," "down," "vertical," "horizontal," "high," "low," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention. Example

[0023] This embodiment provides a connection structure for tunnel shield segments 16, used to connect the tunnel shield segments 16, the post-cast portal structure 17, and the inner lining wall 18; as follows: Figure 1 and Figure 2 As shown, it also includes a sealing connector, which includes a special-shaped bolt 1. The shape of the special-shaped bolt 1 is respectively matched with the tunnel shield segment 16 and the post-cast portal structure 17. The special-shaped bolt 1 is provided with a first connecting part and a second connecting part. The first connecting part is used to fix and connect with the tunnel shield segment 16. It can be seen that the first connecting part is located at the left end of the special-shaped bolt 1. The second connecting part is used to fix with the post-cast portal. It can be seen that the second connecting part is located at the bent end of the special-shaped bolt 1. Both the first connecting part and the second connecting part are provided with water-swellable rubber gaskets 2.

[0024] Specifically, both the first connecting part and the second connecting part include a first nut 8 and a first washer 9, with the first washer 9 abutting against the water-swellable rubber washer 2.

[0025] The effect that this embodiment can achieve is: by replacing the existing rebar installation method with special-shaped bolts 1, for irregular connection surfaces of shield tunnel segments and portals (such as segment curvature and portal ring nodes), special-shaped bolts can be designed with arc-shaped contact surfaces and positioning steps, which can directly and accurately fit with the pre-reserved holes of the segments and the pre-embedded parts of the portal, avoiding the problem of "rebar misalignment" caused by construction errors in rebar installation.

[0026] In addition, if the connection needs to transmit "multi-directional forces" (such as longitudinal thrust and radial pressure in tunnels), special-shaped bolts can ensure direct force transmission by optimizing the thread profile and bolt length; while rebar installation relies on the bond between the rebar and concrete, which is unidirectional and prone to local debonding due to deviations in the force angle, resulting in failure of the rebar bond strength.

[0027] Furthermore, it is known that the water-swellable rubber gasket 2 possesses the elasticity of ordinary rubber in its dry state, and can fill the tiny gaps in the contact surface through compression deformation, forming an initial static seal. When it comes into contact with moisture (such as groundwater, rainwater, or condensate), the water-absorbing polymer (such as sodium polyacrylate or starch graft copolymer) in the gasket absorbs moisture and expands, increasing its volume. The expanded gasket further compresses the contact surface, filling the gaps not completely covered during the initial seal, and even penetrating into concrete cracks or microscopic pits on metal surfaces, forming a self-healing seal. Through the inherent characteristics of the water-swellable rubber gasket 2, the tightness and waterproof sealing effect of the connection between the irregular bolt 1 and the post-cast portal structure 17 and the tunnel shield segment 16 are ensured.

[0028] Furthermore, pre-embedded grouting pipes 7 are installed between the post-cast portal structure 17 and the tunnel shield segment 16, and between the post-cast portal structure 17 and the inner lining wall 18. Additionally, water-swellable sealing strips 3 are installed at the construction joints between the post-cast portal structure 17 and the tunnel shield segment 16, and at the construction joints between the post-cast portal structure 17 and the inner lining wall 18. By injecting grout into the construction joints through the grouting pipes and cooperating with the water-swellable sealing strips 3, the dual advantages of rigid filling and flexible adaptive sealing are combined, significantly improving the sealing performance.

[0029] Furthermore, to ensure the stable placement of the water-swellable rubber gasket 2, such as... Figure 3 As shown, in this embodiment, a wedge-shaped opening 14 is provided at the position where the tunnel shield segment 16 abuts against the water-swellable rubber gasket 2, and the water-swellable rubber gasket 2 has a conical structure to abut against and cooperate with the wedge-shaped opening 14.

[0030] The wedge-shaped opening 14 and the conical structure of the water-swellable rubber gasket 2 are matched to ensure that the water-swellable rubber gasket 2 can be stably locked, which improves the tightness of the connection between the tunnel shield segment 16 and the post-cast portal structure 17.

[0031] Additionally, the post-cast portal structure 17 is connected to the inner lining wall 18 via pre-embedded connecting bars 6. A ring-shaped steel plate 4 and anchor bars 5 are pre-embedded at the location of the inner lining wall 18. Specifically, the ring-shaped steel plate 4 and anchor bars 5 are connected by welding while avoiding the pre-embedded connecting bars 6. Furthermore, the ring-shaped steel plate 4 is connected to the shield portal embedded part 19 via bolt assemblies. The post-cast portal structure 17 also includes post-cast ring beam reinforcement 15.

[0032] Specifically, such as Figure 1 and Figure 4 As shown, the shield tunnel portal embedded part 19 is an existing integral component. The shield tunnel portal embedded part 19 includes a curtain rubber plate, a flap plate and a circular ring plate. The curtain rubber plate and the flap plate are arranged side by side, and the circular ring plate is located below the flap plate. In this embodiment, the bolt assembly passes through the circular ring plate and the annular steel plate 4.

[0033] Furthermore, the bolt assembly includes a double-ended stud 10, a second nut 12, and a nut 13. The second nut 12 is located near the shield tunnel portal embedded part 19 and abuts against the shield tunnel portal embedded part 19 through a second washer 20. The nut 13 is located near the annular steel plate 4. The bolt assembly effectively connects the inner lining cavity to the shield tunnel portal embedded part 19 to form a rigid whole.

[0034] In addition, the addition of a pre-embedded grouting pipe 7 and a water-swellable waterstop strip 3 at the joint between the post-cast portal structure 17 and the inner lining wall 18 not only ensures the effective installation of the conventional shield portal pre-embedded parts 19 in the later stage, but also ensures the effective connection and waterproof sealing effect between the post-cast portal structure 17 and the inner lining wall 18.

[0035] Furthermore, an end block 11 is provided at the end of the irregular bolt 1 near the post-cast opening structure 17. During bolt connection, the nut or bolt head directly contacts the surface of the connected parts, resulting in a small contact area. This easily leads to high stress concentration near the contact point, causing localized plastic deformation, crack initiation, or even fracture (especially with high-strength bolts or brittle materials). The end block 11 acts as an intermediate transition piece, distributing the concentrated load of the bolt over a larger area and reducing the contact stress on the surface of the connected parts. The end block 11 is designed as an anti-loosening structure, cooperating with the bolt or nut to prevent relative rotation.

[0036] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A connection structure for tunnel shield segments, used to connect tunnel shield segments, a post-cast portal structure, and an inner lining wall, wherein the post-cast portal structure is connected to the inner lining wall; characterized in that, The device includes a sealing connector, which includes a special-shaped bolt. The shape of the special-shaped bolt is respectively matched with the tunnel shield segment and the post-cast portal structure. The special-shaped bolt is provided with a first connecting part and a second connecting part. The first connecting part is used to fix and connect with the tunnel shield segment, and the second connecting part is used to fix with the post-cast portal. Both the first connecting part and the second connecting part are provided with water-swellable rubber gaskets.

2. The connection structure for tunnel shield segments according to claim 1, characterized in that, Both the first connecting part and the second connecting part include a first nut and a first washer, wherein the first washer abuts against a water-swellable rubber gasket.

3. The connection structure for tunnel shield segments according to claim 1, characterized in that, The irregular bolt has an end block at one end near the post-cast portal structure.

4. The connection structure for tunnel shield segments according to claim 1, characterized in that, A wedge-shaped opening is provided at the position where the tunnel shield segment abuts against the water-swellable rubber gasket, and the water-swellable rubber gasket has a conical structure to abut against and cooperate with the wedge-shaped opening.

5. The connection structure for tunnel shield segments according to claim 1, characterized in that, Pre-embedded grouting pipes are installed between the post-cast portal structure and the tunnel shield segments, as well as between the post-cast portal structure and the inner lining wall.

6. The connection structure for tunnel shield segments according to claim 1, characterized in that, Water-swellable sealing strips are installed at the gaps between the post-cast portal structure and the tunnel shield segments, as well as at the gaps between the post-cast portal structure and the inner lining wall.

7. The connection structure for tunnel shield segments according to claim 1, characterized in that, The inner lining wall is equipped with pre-embedded connecting bars for connection with the post-cast portal structure.

8. The connection structure for tunnel shield segments according to claim 1, characterized in that, The inner lining wall is also connected to a shield tunnel portal embedded part on one side.

9. The connection structure for tunnel shield segments according to claim 8, characterized in that, The inner lining wall is pre-embedded with annular steel plates and anchor bars. The annular steel plates are welded to the anchor bars, and the annular steel plates are connected to the shield tunnel portal pre-embedded parts by bolt assemblies.

10. The connection structure for tunnel shield segments according to claim 9, characterized in that, The bolt assembly includes a double-ended stud, a second nut, and a bolt cap. The second nut is located on the side near the pre-embedded part of the shield tunnel portal, and the bolt cap is located on the side near the annular steel plate.

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