Shield tail sealing device of shield tunneling machine

Abstract

The utility model relates to the field of shield tunneling machines, in particular to a shield tail sealing device of a shield tunneling machine, which comprises a first shield tail brush, the first shield tail brush is arranged on the outermost side of the inner wall of the shield tail of the shield tunneling machine, one side of the first shield tail brush is provided with a mounting frame, and the mounting frame is arranged in a slot corresponding to the shield tail of the shield tunneling machine. According to the shield tail sealing structure, the sealing performance of the shield tail can be improved by arranging the multiple sealing layers, sealing is conducted through the front shield tail brush and the rear shield tail brush, then the first sealing strip is tightly attached to a pipe piece to improve the sealing performance, grease is injected into the two sides through an inner pipeline of the shield tail to improve the sealing performance, and therefore water and mud burst of a tunnel can be avoided; and therefore, serious consequences are caused by instability of an excavation face.

Description

Technical Field

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

[0002] Shield tunneling technology, especially earth pressure balance shield tunneling technology, has been widely used in large-scale underground engineering projects due to its advantages such as strong adaptability to geological formations, high level of information intelligence, safety and speed, and maintenance of harmony and unity with the surrounding environment. However, shield tunneling in the dredged sand layers of reclaimed land is currently a difficult problem encountered in subway construction projects. Because the reclaimed land area contains a large number of medium to heavy liquefaction layers (medium to coarse sand) and weak layers (silt layer, silty clay layer), the strata have the characteristics of high compressibility and low bearing capacity, which have an adverse impact on the initiation and excavation of shield tunnels. This is because these characteristics cause the shield tail sealing device to slide forward as excavation progresses. When the device is improperly configured or is worn and torn by stress, the seal will fail, which can easily lead to water and mud inrush in the tunnel, causing instability of the excavation face and serious consequences. For example, grout, ground water (or seawater), and sand may flow into the tunnel, causing excessive surface subsidence (and even roof collapse in severe cases in the sea section), thereby endangering the safety of buildings and underground pipelines directly above and around the surface, and making construction inside the tunnel difficult. Utility Model Content

[0003] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention may be realized and obtained by means of the structures particularly pointed out in the description and other accompanying drawings.

[0004] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a shield tail sealing device for a tunnel boring machine to solve the existing problems.

[0005] To achieve the above objectives, the technical solution of this utility model is: a shield tail sealing device for a tunnel boring machine, including a first shield tail brush, which is installed on the outermost side of the inner wall of the shield tail of the tunnel boring machine. A mounting frame is provided on one side of the first shield tail brush, which is installed in a corresponding slot at the shield tail of the tunnel boring machine. A first sealing strip is installed in the mounting frame. A second shield tail brush is provided on the other side of the mounting frame. Grease is injected into the gap between the first shield tail brush, the second shield tail brush and the mounting frame through an oil injection port provided at the shield tail of the tunnel boring machine. An emergency sealing device is provided on one side of the second shield tail brush.

[0006] In some embodiments, a pressure sensor is mounted in the mounting bracket.

[0007] In some embodiments, the sealing strip is hollow inside and is connected to a pipe installed inside the tail of the tunnel boring machine for inflation.

[0008] In some embodiments, the emergency sealing device includes a mounting housing installed in a groove at a position opposite to the tail of a tunnel boring machine. The mounting housing has a placement groove on its end face and connecting grooves on both sides. The mounting housing has a plurality of through holes on its side wall, which extend from the mounting housing to the inner wall of the placement groove. A second sealing strip is placed in the placement groove. Rubber strips matching the connecting grooves are provided on the top of both sides of the second sealing strip. A sliding rod is provided in the through hole, which installs the rubber strips into the connecting grooves through the through hole.

[0009] In some embodiments, the through hole is provided with a threaded cap at the outer end of the mounting housing, and the end face of the threaded cap is provided with a groove.

[0010] In some embodiments, the second sealing strip has sealing grooves on both sides of its bottom, the sealing grooves are filled with grease and sealed in the sealing grooves by a film.

[0011] By adopting the above technical solution, the beneficial effects of this utility model are:

[0012] By setting up multiple sealing layers, the sealing performance of the shield tail can be increased. The front and rear shield tail brushes are used for sealing, and the first sealing strip is made to fit tightly against the tunnel segment to increase the sealing performance. Furthermore, grease is injected into both sides through the internal pipes of the shield tail to further enhance the sealing performance. This can prevent water and mud from flowing into the tunnel, which could cause instability at the excavation face and lead to serious consequences.

[0013] The housing is installed by connecting the pipe at the tail of the shield, allowing gas to enter the placement slot. The gas then pushes the sliding rod outward through the through hole, separating it from the rubber strip. This allows the sealing strip to be pushed downward to adhere to the tube segment, achieving an emergency seal.

[0014] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure.

[0015] Undoubtedly, such and other objects of this invention will become more apparent after the following detailed description of the preferred embodiments, which are illustrated in various accompanying drawings and illustrations.

[0016] To make the above and other objects, features and advantages of this utility model more apparent and understandable, one or more preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0018] In the accompanying drawings, the same parts use the same reference numerals, and the drawings are schematic and not necessarily drawn to actual scale.

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one or more embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on such drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the shield tail sealing device according to some embodiments of the present invention;

[0021] Figure 2 This is a schematic diagram of the shield tail mounting bracket according to some embodiments of the present invention;

[0022] Figure 3 This is a structural cross-sectional view of an emergency sealing device according to some embodiments of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the mounting shell according to some embodiments of the present invention.

[0024] Attached image labels:

[0025] 1. First shield tail brush;

[0026] 2. Mounting bracket;

[0027] 21. First sealing strip; 22. Pressure testing device;

[0028] 3. Second shield tail brush;

[0029] 4. Emergency sealing device;

[0030] 41. Housing assembly; 42. Placement slot; 43. Connection slot; 44. Through hole; 45. Second sealing strip; 46. Rubber strip; 47. Sliding rod; 48. Threaded cap; 49. Groove;

[0031] 5. Sealing groove;

[0032] 6. Oils and fats. Detailed Implementation

[0033] 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 specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.

[0034] Furthermore, it should be understood in the description of this utility model that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" 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 utility model 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 limitations on this utility model.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. However, specifying a direct connection indicates that the two main bodies at the connection point are not connected through a transitional structure, but are simply connected to form a whole through a connecting structure. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0036] In this utility model, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0037] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0038] Reference Figure 1-4This utility model provides a shield tail sealing device for a tunnel boring machine (TBM), including a first shield tail brush 1, which is installed on the outermost side of the inner wall of the shield tail of the TBM. A mounting frame 2 is provided on one side of the first shield tail brush 1, which is installed in the corresponding slot of the shield tail of the TBM. A first sealing strip 21 is installed in the mounting frame 2. A second shield tail brush 3 is provided on the other side of the mounting frame 2. Grease 6 is injected into the gap between the first shield tail brush 1, the second shield tail brush 3 and the mounting frame 2 through the oil injection port provided on the shield tail of the TBM. An emergency sealing device 4 is provided on one side of the second shield tail brush 3.

[0039] By setting multiple sealing layers, the sealing performance of the shield tail can be increased. The front and rear shield tail brushes are used for sealing, and the first sealing strip 21 is made to fit tightly against the tunnel segment to increase the sealing performance. Grease 6 is injected into both sides through the internal pipes of the shield tail to increase the sealing performance. Finally, an emergency sealing device 4 is added so that it can be activated in case the three layers of sealing fail to seal and handle the situation. This can prevent water and mud from flowing into the tunnel, which could cause instability of the excavation face and serious consequences.

[0040] According to some embodiments of this utility model, optionally, a pressure sensor 22 is installed in the mounting bracket 2. This allows for testing the pressure of the sealing strip.

[0041] According to some embodiments of this utility model, optionally, the sealing strip 21 is hollow inside and is connected to a pipe installed inside the tail of the tunnel boring machine for inflation. The inflated sealing strip allows it to fit more closely to the tunnel lining segments, thus increasing its sealing performance.

[0042] According to some embodiments of the present invention, optionally, the emergency sealing device 4 includes a mounting housing 41 installed in a groove at a position opposite to the tail of the tunnel boring machine. The mounting housing 41 has a placement groove 42 on its end face and connecting grooves 43 on both sides of the placement groove 42. The side wall of the mounting housing 41 has a plurality of through holes 44 extending from the mounting housing 41 to the inner wall of the placement groove 42. A second sealing strip 45 is placed in the placement groove 42. Rubber strips 46 matching the connecting grooves 43 are provided on the top of both sides of the second sealing strip 45. A sliding rod 47 is provided in the through hole 44, and the sliding rod 47 installs the rubber strips 46 into the connecting grooves 43 through the through hole 44.

[0043] The housing 41 is installed by connecting the pipe at the tail of the shield, allowing gas to enter the placement groove 42. The gas then pushes the sliding rod 47 outward through the through hole 44, separating it from the rubber strip 46. This allows the sealing strip to be pushed downward to adhere to the tube segment, achieving an emergency seal. At the same time, a support plate can be set inside the rubber strip 46 to provide better support and prevent the rubber strip 46 from being too soft and running out of the connecting groove 43 after being pushed, thus causing the seal to fail. Additionally, one end of the sliding rod 47 can be designed as a concave arc surface to increase the force-bearing area and promote better pushing.

[0044] According to some embodiments of this utility model, optionally, a threaded cap 48 is provided in the outer end of the mounting housing 41 for the through hole 44, and the end face of the threaded cap 48 is provided with a groove 49. This can prevent dirt or other substances from blocking the through hole 44 and preventing the sliding rod 47 from sliding after the previous seal fails. At the same time, after subsequent use, when replacing the new sealing strip, the threaded cap 48 is opened by rotating the groove 49, which pushes the sliding rod 47 to insert and fix the new sealing strip for use.

[0045] According to some embodiments of this utility model, optionally, the second sealing strip 45 has sealing grooves 5 on both sides of its bottom. The sealing grooves 5 are filled with grease 6 and sealed in the sealing grooves 5 by a membrane. After inflation, the second sealing strip 45 will fit more closely to the outer wall of the tunnel segment, so that when the tunnel boring machine pushes, the membrane can be rubbed and torn to allow the grease 6 to flow out and increase its sealing performance.

[0046] Working principle:

[0047] During segment installation, multiple sealing layers are used to adhere to the outer wall of the segment, which increases the sealing performance of the shield tail. The front and rear shield tail brushes seal the segment, and the first sealing strip 21 is tightly attached to the segment to further enhance the sealing performance. Grease 6 is injected into both sides through the internal pipes of the shield tail to further enhance the sealing performance. Finally, an emergency sealing device 4 is added, which can be activated in case the three-layer seal fails to seal the segment. The outer casing 41 is connected to the shield tail pipe, allowing gas to enter the placement groove 42. The gas pushes the sliding rod 47 outward through the through hole 44, thus separating it from the rubber strip 46. This allows the sealing strip to be pushed downward to adhere to the segment, achieving an emergency seal.

[0048] It should be understood that the embodiments disclosed herein are not limited to the specific processing steps or materials disclosed herein, but should be extended to equivalent substitutions of such features as understood by those skilled in the art. It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

[0049] The term "embodiment" in this specification refers to a specific feature or characteristic described in connection with an embodiment that is included in at least one embodiment of the present invention. Therefore, phrases or "embodiments" appearing in various places throughout the specification do not necessarily refer to the same embodiment.

[0050] Furthermore, the described features or characteristics may be incorporated into one or more embodiments in any other suitable manner. In the above description, specific details, such as thickness, quantity, etc., are provided to provide a comprehensive understanding of embodiments of the present invention. However, those skilled in the art will understand that the present invention can be implemented without the aforementioned one or more specific details or may be implemented using other methods, components, materials, etc.

Claims

1. A shield tail sealing device for a tunnel boring machine, characterized in that, include: The first tail brush (1) is installed on the outermost side of the inner wall of the shield tail of the tunnel boring machine. The first tail brush (1) has a mounting bracket (2) on one side. The mounting bracket (2) is installed in the corresponding slot of the shield tail of the tunnel boring machine. The mounting bracket (2) has a first sealing strip (21) installed in it. The second tail brush (3) is provided on the other side of the mounting bracket (2). The gap between the first tail brush (1) and the second tail brush (3) and the mounting bracket (2) is filled with grease (6) through the oil injection port provided on the shield tail of the tunnel boring machine. An emergency sealing device (4) is provided on one side of the second tail brush (3).

2. The shield tail sealing device of the tunnel boring machine according to claim 1, characterized in that: The mounting bracket (2) contains a pressure sensor (22).

3. The shield tail sealing device of the tunnel boring machine according to claim 1, characterized in that: The sealing strip (21) is hollow inside and is connected to the pipe installed inside the shield tail of the tunnel boring machine for inflation.

4. The shield tail sealing device of the tunnel boring machine according to claim 1, characterized in that: The emergency sealing device (4) includes an installation housing (41) installed in a groove at the opposite position of the shield tail of the tunnel boring machine. The end face of the installation housing (41) is provided with a placement groove (42). The placement groove (42) is provided with connecting grooves (43) on both sides. The side wall of the installation housing (41) is provided with multiple through holes (44). The through holes (44) extend from the installation housing (41) to the inner wall of the placement groove (42). The placement groove (42) is provided with a second sealing strip (45). The top of both sides of the second sealing strip (45) is provided with rubber strips (46) that match the connecting grooves (43). The through holes (44) are provided with sliding rods (47). The sliding rods (47) install the rubber strips (46) into the connecting grooves (43) through the through holes (44).

5. The shield tail sealing device of the tunnel boring machine according to claim 4, characterized in that: The through hole (44) is located at the outer end of the mounting housing (41) and is provided with a threaded cap (48), the end face of which is provided with a groove (49).

6. The shield tail sealing device of the tunnel boring machine according to claim 4, characterized in that: The second sealing strip (45) has sealing grooves (5) on both sides of its bottom. The sealing grooves (5) are filled with grease (6) and sealed in the sealing grooves (5) by a membrane.

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