A shield tail sealing device

Abstract

The utility model relates to a shield tail sealing device, which comprises an annular steel plate, a rubber sealing ring, and a ring-shaped protrusion. The utility model can overcome the technical problem that the existing shield tail sealing means cannot reliably seal the gap between the shield tail shell and the shield segment, leading to a high risk of leakage during tail brush replacement construction.

Description

Technical Field

[0001] This utility model relates to the field of shield tunneling technology, and in particular to a shield tail sealing device. Background Technology

[0002] During the operation of a tunnel boring machine (TBM), the tail brush inevitably suffers damage as the tunneling distance increases, necessitating regular inspection and replacement. However, this inspection and replacement requires removing the tunnel segments located along the tail brush's long-distance path, significantly weakening the seal between the tail and the tunnel segments. While existing technology inserts sealing material into the gap between the tail shell and the tunnel segments, the combined effects of water inflow behind the tail, material creep and aging, and TBM movement cause the sealing material to gradually fall out or even be ejected, failing to reliably seal the gap. This results in a significant risk of leakage during tail brush replacement. Therefore, there is an urgent need to develop a more reliable tail sealing device to improve the safety of tail brush replacement. Utility Model Content

[0003] The purpose of this invention is to overcome the technical problem that existing shield tail sealing methods cannot reliably seal the gap between the shield tail shell and the shield tunnel segments, resulting in a significant risk of leakage during tail brush replacement construction, and to provide a shield tail sealing device.

[0004] In a first aspect, the present invention provides a shield tail sealing device, comprising: Circular steel plate; The rubber sealing ring is located on one side of the annular steel plate. An annular protrusion is provided on the side of the rubber sealing ring away from the annular steel plate. The outer diameter of the annular steel plate, the outer diameter of the rubber sealing ring, and the outer diameter of the annular protrusion are all matched with the inner diameter of the shield tail shell. The width of the annular protrusion at the end away from the annular steel plate is less than or equal to the gap width between the shield tail shell and the shield tunnel segment.

[0005] Preferably, the annular steel plate is divided into several steel plate segments along its circumference.

[0006] Preferably, two adjacent steel plates are detachably connected in segments.

[0007] Preferably, threaded holes are provided at both ends of the steel plate segment along its circumference, and a screw is inserted into the adjacent threaded holes of two adjacent steel plate segments.

[0008] Preferably, at least two threaded holes are provided at each end of the steel plate segment, and the threaded holes are distributed at radial intervals along the steel plate segment.

[0009] Preferably, the number and length of the steel plate segments and the shield tunnel segments are matched.

[0010] Preferably, the width of the annular protrusion decreases in the direction away from the annular steel plate.

[0011] Preferably, the inner diameter of the annular steel plate and the inner diameter of the rubber sealing ring are both smaller than the outer diameter of the shield tunnel segment.

[0012] Preferably, the inner diameter of the annular steel plate matches the inner diameter of the tunnel segment.

[0013] Preferably, the inner diameter of the rubber sealing ring matches the inner diameter of the annular steel plate.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention provides a shield tail sealing device. By setting a rubber sealing ring with an annular protrusion on one side of an annular steel plate, during tail brush replacement, the shield machine's jacks can be used to press the annular steel plate and rubber sealing ring against the end face of the shield segment, allowing the annular protrusion to insert into the gap between the tail shell and the shield segment, thus achieving a seal between the tail shell and the shield segment. Furthermore, the thrust generated by the jacks can be evenly distributed to all parts of the rubber sealing ring by the annular steel plate. Therefore, as long as the reaction force on the rubber sealing ring does not exceed the thrust of the jacks, the rubber sealing ring can always remain at the end of the shield segment, keeping the annular protrusion inserted into the gap between the tail shell and the shield segment, without falling off or being pushed out. Therefore, compared with the prior art, this invention has higher sealing reliability, thus better ensuring the safety of tail brush replacement operations. Attached Figure Description

[0015] Figure 1 This is a front view structural diagram of a shield tail sealing device according to the present invention; Figure 2 yes Figure 1 A magnified front view of the structure at point A in the middle; Figure 3 This is a rear view structural schematic diagram of a shield tail sealing device according to this utility model; Figure 4 yes Figure 3 A schematic diagram of the partial cross-sectional structure at section BB in the middle section; Figure 5 This is a schematic diagram illustrating the working principle of a shield tail sealing device according to this utility model; Figure 6 yes Figure 5 A magnified schematic diagram of the structure at point C in the middle; icon: 100 - Ring-shaped steel plate; 110 - Steel plate segment; 111 - Nut; 112 - Threaded rod; 200 - Rubber sealing ring; 210 - Annular protrusion; 300 - Tail shield shell; 310 - Jack; 320 - Tail brush; 400-Shield tunnel segment. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0017] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0018] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0019] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0020] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0021] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0022] Example 1 like Figures 1 to 6 As shown, a shield tail sealing device includes an annular steel plate 100 and a rubber sealing ring 200. The rubber sealing ring 200 is located on one side of the annular steel plate 100 along its axial direction. An annular protrusion 210 is provided on the side of the rubber sealing ring 200 away from the annular steel plate 100. The outer diameter of the annular steel plate 100, the outer diameter of the rubber sealing ring 200, and the outer diameter of the annular protrusion 210 are all matched with the inner diameter of the shield tail shell 300. The width of the end of the annular protrusion 210 away from the annular steel plate 100 is less than or equal to the gap width between the shield tail shell 300 and the shield segment 400.

[0023] For example, if the inner diameter of the tail shield shell 300 is 7.15m, the outer diameter of the shield segment 400 is 7m, and the gap width between the inner wall of the tail shield shell 300 and the outer wall of the shield segment 400 is 0.15m, then the outer diameter of the annular steel plate 100, the rubber sealing ring 200, and the annular protrusion 210 can all be set to 7.15m, the inner diameter of the annular steel plate 100 and the rubber sealing ring 200 can be set to less than 7m, and the width of the annular protrusion 210 at the end away from the annular steel plate 100 can be designed to be less than or equal to 0.15m.

[0024] When using the shield tail sealing device of this embodiment, such as Figure 5 As shown, an annular steel plate 100 and a rubber sealing ring 200 are placed inside the tail shield housing 300, so that the outer surfaces of the annular steel plate 100 and the rubber sealing ring 200 are in close contact with the inner surfaces of the tail shield housing 300, and the rubber sealing ring 200 faces the shield segment 400; then the jack 310 of the tunnel boring machine is extended to press the annular steel plate 100 and the rubber sealing ring 200 against the shield segment 400 until the rubber sealing ring 200 is in close contact with the end face of the shield segment 400 facing the direction of the large mileage, and the annular protrusion 210 is inserted into the gap between the tail shield housing 300 and the shield segment 400, thus completing the reliable sealing of the gap between the tail shield housing 300 and the shield segment 400.

[0025] As can be seen from the above, in this embodiment, the rubber sealing ring 200 is pressed against the end face of the shield segment 400 by the jack 310 through the annular steel plate 100. Therefore, the thrust generated by the jack 310 can be evenly distributed to all parts of the rubber sealing ring 200 by the annular steel plate 100. As long as the reaction force generated by various factors such as water coming from behind the shield tail, material creep aging, and shield machine movement does not exceed the thrust of the jack 310, the rubber sealing ring 200 can always be maintained at the end of the shield segment 400 and keep the annular protrusion 210 inserted into the gap between the shield tail shell 300 and the shield segment 400 without falling off or being pushed out. Therefore, compared with the prior art of simply filling the gap with sealing material, this embodiment has higher sealing reliability, thereby better ensuring the safety of the tail brush 320 replacement construction.

[0026] It should be noted that the width of the annular protrusion 210 refers to half of the difference between the outer diameter and the inner diameter of the annular protrusion 210; and the annular protrusion 210 can be of constant width or variable width along the axis of the annular steel plate 100, as long as its width at the end away from the annular steel plate 100 is less than or equal to the gap width between the tail shield shell 300 and the shield segment 400, so that it can be inserted into the gap; the gap width between the tail shield shell 300 and the shield segment 400 refers to half of the difference between the inner diameter of the tail shield shell 300 and the outer diameter of the shield segment 400. Figure 4 The dotted line distinguishes the rubber sealing ring 200 from the annular protrusion 210, solely for the purpose of easy identification of the annular protrusion 210. However, the rubber sealing ring 200 and the annular protrusion 210 can be two different parts on an integrated component or two independent components connected to each other.

[0027] In an optional embodiment, the annular steel plate 100 is divided into several steel plate segments 110 along its circumference.

[0028] This embodiment divides the annular steel plate 100 into several smaller steel plate segments 110. On the one hand, this reduces the difficulty of transporting and operating the annular steel plate 100 in the narrow space of the tunnel. On the other hand, in order to improve the safety of the tail brush 320 maintenance operation, the maintenance of the tail brush 320 is generally carried out in sections along the circumference of the tunnel. This embodiment divides the annular steel plate 100 into multiple steel plate segments 110. During construction, the tail brush 320 can be disassembled and reassembled in sections according to the section maintenance, thereby better avoiding the risk of leakage and ensuring the safety of the tail brush 320 replacement construction.

[0029] In an optional embodiment, two adjacent steel plates are detachably connected in segments 110. The specific methods of detachable connection include, but are not limited to, threaded connection, snap-fit ​​connection or tenon and mortise connection.

[0030] This embodiment can connect two adjacent steel plate segments 110 into a whole, reducing the risk of weakened sealing effect due to misalignment of two adjacent steel plate segments 110. It should be noted that since the annular steel plate 100 is mainly pressed against the end face of the shield tunnel segment 400 by jacks 310, connection between two adjacent steel plate segments 110 is not essential. Figure 1 The connection structure is only set between some steel plate segments 110 to reflect this point, but in actual construction, a connection structure can be set between all two adjacent segments, or no connection structure can be set between all two adjacent segments.

[0031] In an optional embodiment, threaded holes are provided at both ends of the steel plate segment 110 along its circumference. Adjacent threaded holes on two adjacent steel plate segments 110 are aligned with each other and threaded rods 112 are inserted through them. The specific arrangement of the threaded holes includes, but is not limited to, drilling holes directly on the steel plate segment 110; or connecting protrusions to the steel plate segment 110 and then drilling holes on the protrusions to avoid damaging the integrity of the steel plate segment 110; or as... Figure 2 As shown, a nut 111 with a threaded hole is directly welded onto the steel plate segment 110.

[0032] In an optional embodiment, at least two threaded holes are provided at both ends of the steel plate segment 110, and the threaded holes are distributed at radial intervals along the steel plate segment 110 to further improve the connection effect between two adjacent steel plate segments 110.

[0033] In an optional embodiment, the number and length of the steel plate segments 110 and the shield tunnel segments 400 are matched, for example... Figure 1 As shown, the number of steel plate segments 110 is six, with five large and one small, to match the segmentation of shield tunnel segments 400, which consists of five large (standard blocks and adjacent blocks) and one small (K blocks), thus better matching the segmentation and maintenance work of tail brush 320.

[0034] In an optional embodiment, the width of the annular protrusion 210 decreases in the direction away from the annular steel plate 100 so that the annular protrusion 210 can be more easily inserted into the gap between the tail shell 300 and the shield segment 400; the reduction method includes, but is not limited to, linear reduction, step reduction or curved reduction in the direction away from the annular steel plate 100.

[0035] In an optional embodiment, the inner diameter of the annular steel plate 100 and the inner diameter of the rubber sealing ring 200 are both smaller than the outer diameter of the shield segment 400; for example, if the outer diameter of the shield segment 400 is 7m, then the inner diameters of the annular steel plate 100 and the rubber sealing ring 200 can both be set to be less than 7m.

[0036] In this embodiment, the inner diameters of both the annular steel plate 100 and the rubber sealing ring 200 are smaller than the outer diameter of the shield segment 400. During operation, in addition to the annular protrusion 210 being able to insert into the gap between the tail shell 300 and the shield segment 400 and form a seal, a portion of the rubber sealing ring 200 will also be pressed against the end face of the shield segment 400 facing the direction of the greater mileage. This will also form a seal between the rubber sealing ring 200 and the end face of the shield segment 400, thereby increasing the length of the leakage path from the rear of the tail to the interior of the tail shell 300. Therefore, compared with the prior art that simply fills the gap with sealing material, this embodiment can achieve a better sealing effect.

[0037] In an optional embodiment, the inner diameter of the annular steel plate 100 matches the inner diameter of the shield segment 400; for example, if the inner diameter of the shield segment 400 is 6.3m, the inner diameters of both the annular steel plate 100 and the rubber sealing ring 200 can be set to 6.3m.

[0038] This embodiment can maximize the use of the end face of the shield segment 400 to increase the length of the leakage path from the rear of the shield tail to the interior of the shield tail shell 300, thereby further improving the sealing effect of this embodiment.

[0039] In an optional embodiment, the inner diameter of the rubber sealing ring 200 matches the inner diameter of the annular steel plate 100.

[0040] This embodiment ensures that each part of the rubber sealing ring 200 facing the jack 310 is covered by a corresponding annular steel plate 100, thereby ensuring that the thrust of the jack 310 can be transmitted to each part of the rubber sealing ring 200, thus guaranteeing the sealing effect of the rubber sealing ring 200.

[0041] In an optional embodiment, the annular protrusion 210 is a component made of EPDM material to ensure that the annular protrusion 210 can withstand the extreme environment in the gap between the tail shell 300 and the tunnel segment 400.

[0042] In an optional embodiment, the annular protrusion 210 protrudes at least fifty millimeters from the side of the rubber sealing ring 200 away from the annular steel plate 100 to ensure its sealing effect on the gap between the tail shell 300 and the shield segment 400.

[0043] In an optional embodiment, the annular steel plate 100 is a component made of Q265 material.

[0044] The above content is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements 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 tail sealing device, characterized in that, include: Annular steel plate (100); A rubber sealing ring (200) is located on one side of the annular steel plate (100). An annular protrusion (210) is provided on the side of the rubber sealing ring (200) away from the annular steel plate (100). The outer diameter of the annular steel plate (100), the outer diameter of the rubber sealing ring (200), and the outer diameter of the annular protrusion (210) are all matched with the inner diameter of the tail shield shell (300). The width of the annular protrusion (210) at the end away from the annular steel plate (100) is less than or equal to the gap width between the tail shield shell (300) and the shield segment (400).

2. The shield tail sealing device according to claim 1, characterized in that, The annular steel plate (100) is divided into several steel plate segments (110) along its circumference.

3. The shield tail sealing device according to claim 2, characterized in that, The two adjacent steel plates are detachably connected in sections (110).

4. A shield tail sealing device according to claim 3, characterized in that, The steel plate segment (110) has threaded holes at both ends along its circumference, and a screw (112) is inserted into the adjacent threaded holes on two adjacent steel plate segments (110).

5. A shield tail sealing device according to claim 4, characterized in that, At least two threaded holes are provided at both ends of the steel plate segment (110), and the threaded holes are distributed at radial intervals along the steel plate segment (110).

6. A shield tail sealing device according to claim 2, characterized in that, The number and length of the steel plate segments (110) and the shield tunnel segments (400) are matched.

7. A shield tail sealing device according to any one of claims 1 to 6, characterized in that, The width of the annular protrusion (210) decreases in the direction away from the annular steel plate (100).

8. A shield tail sealing device according to any one of claims 1 to 6, characterized in that, The inner diameter of the annular steel plate (100) and the inner diameter of the rubber sealing ring (200) are both smaller than the outer diameter of the shield tunnel segment (400).

9. A shield tail sealing device according to claim 8, characterized in that, The inner diameter of the annular steel plate (100) matches the inner diameter of the shield tunnel segment (400).

10. A shield tail sealing device according to any one of claims 1 to 6, characterized in that, The inner diameter of the rubber sealing ring (200) matches the inner diameter of the annular steel plate (100).

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