Double-shield structure and heading machine

Abstract

The utility model relates to the field of tunnel construction machinery, in particular to a double-shield structure and a heading machine. The double-shield structure comprises a shield body, a driving device, a first sealing assembly and two supporting shoes. Two openings are formed in the surface of the shield body, and the supporting shoes are movably arranged in the corresponding openings under the action of the driving device; the first sealing assembly comprises two first sealing frame first sealing plates and two second sealing frame second sealing plates, and the first sealing frame first sealing plates are arranged at the opening of the shield body and connected with the inner side wall of the shield body so as to isolate the interior of the shield body from the external environment; the second sealing frame is used for covering the driving device and being connected between the two first sealing plates at intervals and is connected with the first sealing plate frames to form a sealing cavity, and the driving device is arranged in the sealing cavity. According to the double-shield structure, the sealing assembly is prevented from being disassembled in the conversion process of the earth pressure mode and the TBM mode of the tunneling machine, and the conversion efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of tunnel construction machinery, and in particular to a double shield structure and a tunnel boring machine. Background Art

[0002] A roadheader is a machine used to dig tunnels under flat ground. It is widely used in underground tunnel construction due to its advantages such as fast digging speed, safe digging work, and ability to dig in complex geological conditions. Due to different geological conditions, the roadheader may need to work in a variety of soil types during construction, and different digging modes of the roadheader are required for different soil types.

[0003] In order to adapt to the construction environment with various alternating soil types, the relevant technical solutions have introduced tunnel boring machines with dual modes of earth pressure and TBM. In the TBM mode, the support shoes of the tunnel boring machine are extended to hold the rock and soil layer tightly. In the earth pressure mode, the support shoes of the tunnel boring machine are retracted to keep the tunnel boring machine sealed.

[0004] However, when adopting the relevant technical solution, the tunnel boring machine needs to add a sealing structure in the earth pressure mode, while in the TBM mode, the added sealing structure needs to be removed, which makes the tunnel boring machine have a larger workload and takes a longer time when switching modes, affecting the construction efficiency of the tunnel boring machine. Utility Model Content

[0005] The present application provides a double shield structure and a tunnel boring machine, which are used to solve the sealing problem of the tunnel boring machine during the conversion process between the earth pressure mode and the TBM mode.

[0006] On the one hand, the present application provides a double shield structure, including a shield body, a drive device, a first sealing assembly and two support shoes;

[0007] The surface of the shield body is formed with two openings, and the gripper shoe is movably arranged in the corresponding openings under the action of the driving device; so that the gripper shoe partially extends out of the opening, or the surface of the gripper shoe and the surface of the shield body are located on the same circumference;

[0008] The first sealing assembly includes two first sealing frames and first sealing plates and two second sealing frames and second sealing plates. The first sealing frames and first sealing plates are arranged at the opening of the shield body and connected to the inner side wall of the shield body to isolate the interior of the shield body from the external environment; the second sealing frames and second sealing plates are used to cover the driving device and are connected between the two first sealing plates at intervals, and are connected to the first sealing plate frame to form a sealed cavity. The driving device is arranged in the sealed cavity, and the driving device partially extends out of the sealed cavity and is connected to the support shoe to drive the support shoe to move.

[0009] In some embodiments, a through hole is formed on the first sealing plate to allow the driving device to extend out.

[0010] In some embodiments, a reserved hole is opened on the second sealing plate, and a sealing member is provided on the reserved hole to seal the gap between the hole wall of the reserved hole and the pipeline of the driving device.

[0011] In some embodiments, the sealing member includes a sealing ring, and the sealing ring is sleeved on the hole wall of the reserved hole.

[0012] In some embodiments, the sealing member further comprises an airbag, and the airbag is embedded in the sealing ring.

[0013] In some embodiments, the inner wall of the sealing ring is provided with at least one groove along the axial direction of the sealing ring, so that the sealing ring forms a plurality of sealing segments, and the sealing segments are arc-shaped and concave toward the center of the reserved hole.

[0014] In some embodiments, the first sealing assembly further includes a sealing cover, which is disposed on the driving device and is respectively connected to the two first sealing plates.

[0015] In some embodiments, it also includes multiple propulsion cylinders, the support shoe is provided with multiple through holes arranged along the axial direction of the shield body, and the multiple propulsion cylinders are evenly arranged in the multiple through holes; a second sealing assembly is also provided between the through holes and the propulsion cylinders, and the second sealing assembly is used to seal the gap between the propulsion cylinder and the through holes.

[0016] In some embodiments, the second sealing assembly includes a first support sleeve and a second sealing member, the first support sleeve is arranged in the through hole, the propulsion cylinder is passed through the first support sleeve, and the second sealing member is arranged in the first support sleeve and abuts against the propulsion cylinder.

[0017] On the other hand, the present application provides a tunnel boring machine, comprising a tunnel boring machine body and a double shield structure arranged on the tunnel boring machine body.

[0018] The present application provides a double shield structure and a tunnel boring machine. The double shield structure is provided with a first sealing plate and a second sealing plate. The first sealing plate isolates the interior of the shield from the external environment, so that the tunnel boring machine is in a sealed state in both earth pressure and TBM modes. There is no need to remove the sealing mechanism, which is beneficial to saving the time of switching modes of the tunnel boring machine, reducing the workload, and improving the construction efficiency of the tunnel boring machine. At the same time, the sealing cavity formed by the first sealing plate and the second sealing plate wraps the driving device, thereby realizing the sealing of the driving device and improving the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0020] Figure 1 A simplified structural diagram of a tunnel boring machine provided in an embodiment of the present application;

[0021] Figure 2 A schematic diagram of the structure of the support shoe provided in an embodiment of the present application in an open state;

[0022] Figure 3 A schematic diagram of the structure of the gripper provided in an embodiment of the present application in a retracted state;

[0023] Figure 4 for Figure 1 A schematic diagram of the enlarged structure of part A;

[0024] Figure 5 for Figure 3 Schematic diagram of the enlarged structure of part B.

[0025] Description of reference numerals:

[0026] 1. Knife plate;

[0027] 100, shield body; 110, front shield; 120, telescopic outer shield; 130, telescopic inner shield; 140, tightening shield; 141, opening; 150, shield tail;

[0028] 200, stays; 210, through holes;

[0029] 300, first sealing assembly; 310, first sealing plate; 311, through hole; 320, second sealing plate; 321, reserved hole; 322, sealing ring; 323, airbag; 330, sealing cover;

[0030] 400, propulsion cylinder;

[0031] 500, second sealing assembly; 510, first supporting sleeve; 520, second sealing element; 530, second supporting sleeve;

[0032] 600. Driving device.

[0033] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0034] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0035] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In this application, unless otherwise clearly specified and limited, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] As described in the background technology, in the solution of the related technology, a tunnel boring machine with earth pressure and TBM dual modes needs to add a sealing structure when working in earth pressure mode, and needs to remove the added sealing structure in TBM mode; therefore, the tunnel boring machine has a large workload and takes a long time when switching modes, which affects the construction efficiency of the tunnel boring machine. The inventor found that the reason for this problem is that the setting position of the sealing mechanism affects the TBM mode of the tunnel boring machine, so that it has to be removed before it can be constructed in TBM mode.

[0039] In order to solve the above problems, the present application provides a double shield structure and a tunnel boring machine. The double shield structure is provided with a first sealing plate and a second sealing plate. The first sealing plate isolates the interior of the shield from the external environment, so that the tunnel boring machine is in a sealed state in both earth pressure and TBM modes. There is no need to remove the sealing mechanism, which is beneficial to saving the time of switching modes of the tunnel boring machine, reducing workload, and improving the construction efficiency of the tunnel boring machine. At the same time, the sealing cavity formed by the first sealing plate and the second sealing plate wraps the driving device, thereby realizing the sealing of the driving device and improving the sealing effect.

[0040] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0041] On the one hand, the present application provides a double shield structure, referring to Figures 1 to 5 The double shield structure includes a shield body 100 , a support shoe 200 , a driving device 600 , a first sealing assembly 300 and two support shoes 200 .

[0042] The shield body 100 has two openings 141 formed on its surface, and the shoe 200 is movably disposed in the corresponding openings 141 under the action of the driving device 600, so that the shoe 200 partially extends out of the opening 141, or the surface of the shoe 200 and the surface of the shield body 100 are located on the same circumference.

[0043] The first sealing assembly 300 includes two first sealing frames and first sealing plates 310 and two second sealing frames and second sealing plates 320. The first sealing frames and first sealing plates 310 are arranged at the opening 141 of the shield body 100 and are connected to the inner wall of the shield body 100 to isolate the interior of the shield body 100 from the external environment; the second sealing frame and second sealing plate 320 are used to cover the driving device 600 and are connected between the two first sealing plates 310 at intervals, and are connected to the first sealing plate frame 310 to form a sealed cavity. The driving device 600 is arranged in the sealed cavity, and the driving device 600 partially extends out of the sealed cavity and is connected to the support shoe 200 to drive the support shoe 200 to move.

[0044] Reference Figure 1Along the axis direction of the tunnel boring machine, the shield body 100 includes a front shield 110, a telescopic outer shield 120, a telescopic inner shield 130, a tightening shield 140 and a shield tail 150, and the tightening shield 140 is arranged between the telescopic inner shield 130 and the shield tail 150. Among them, the tunnel boring machine includes a cutterhead 1, and the cutterhead 1 is installed on the front shield 110 through a bearing and other structures. A driving mechanism connected to the cutterhead 1 along the axial direction is provided in the front shield 110, and the driving mechanism can drive the cutterhead 1 to rotate around the axial direction of the tunnel boring machine, thereby realizing the action of cutting the soil layer. The front shield 110 is fixedly connected with the telescopic outer shield 120 by bolts and other parts. The telescopic outer shield 120 and the telescopic inner shield 130 are nested and matched, and the telescopic outer shield 120 and the telescopic inner shield 130 can be retracted along the axial direction of the tunnel boring machine, for example, the relative retraction between the two can be achieved by parts such as a cylinder. The telescopic inner shield 130 is hinged with the tightening shield 140, and the two can achieve a certain angle of rotation, so that the tunneling posture can be adjusted. The support shield 140 and the shield tail 150 can be fixedly connected by welding or the like. The opening 141 is provided on the support shield 140 .

[0045] Specifically, the tightening shield 140 and the gripper shoe 200 have a relative first state and a second state. In the first state, the driving device 600 drives the gripper shoe 200 to extend out of the opening 141, at which time the gripper shoe 200 extends to tighten the soil layer, and the tunnel boring machine works in the TBM mode. In the second state, the driving device 600 drives the gripper shoe 200 to retract into the tightening shield 140, so that the surface of the gripper shoe 200 and the surface of the tightening shield 140 are located in the same circumference, the tunnel boring machine shield body 100 is in a sealed state, and the tunnel boring machine works in the earth pressure mode.

[0046] By adopting the above technical solution, the first sealing plate 310 isolates the interior of the support shield 140 from the external environment, so that the tunnel boring machine is in a sealed state in both earth pressure and TBM modes, and there is no need to remove the sealing mechanism, which is beneficial to saving the time of switching modes of the tunnel boring machine, reducing the workload, and improving the construction efficiency of the tunnel boring machine. At the same time, the sealing cavity formed by the first sealing plate 310 and the second sealing plate 320 wraps the driving device 600, thereby achieving the sealing of the driving device 600 and improving the sealing effect.

[0047] The surface of the tightening shield 140 of this embodiment is formed with two openings 141, which are symmetrically arranged. Gripper shoes 200 are arranged in the two openings 141. In the TBM mode, the two grippers 200 extend from the two openings 141 to abut against the soil layers on both sides. The first sealing assembly 300 is arranged on the side of the two grippers 200 away from the corresponding openings 141, so as to ensure that the tunnel boring machine is in a sealed state in both the earth pressure mode and the TBM mode.

[0048] The first sealing plate 310 is provided with a through hole 311 for the driving device 600 to extend out.

[0049] Furthermore, the driving device 600 of this embodiment includes a cylinder and two piston rods, the two piston rods are respectively located at the two ends of the cylinder, and the two piston rods are respectively connected to the two grippers 200. The two piston rods can be synchronously extended or retracted into the cylinder, thereby ensuring the consistency of the movement of the grippers 200 on both sides. The specific number of the driving devices 600 in this embodiment can be set as needed. Preferably, two driving devices 600 can be set, and the two driving components are parallel to each other.

[0050] In some embodiments, reference Figures 1 to 3 The first sealing assembly 300 further includes a sealing cover 330 , which is disposed on the driving device 600 and is respectively connected to the two first sealing plates 310 .

[0051] In some embodiments, the sealing cover 330 is groove-shaped, the open side of the sealing cover 330 is connected to the second sealing plate 320 to enclose and form a sealed cavity, and both ends of the sealing cover 330 are connected to the through holes 311 of the two first sealing plates 310 .

[0052] By adopting the above technical solution, the open side of the sealing cover 330 is welded and fixed to the side of the second sealing plate 320, thereby forming a sealed cavity together with the second sealing plate 320, and the driving device 600 is installed in the sealed cavity, thereby achieving independent sealing of the driving device 600.

[0053] Furthermore, two driving devices 600 are provided, and therefore, two sealing covers are provided correspondingly.

[0054] Specifically, the two sealing covers 330 are respectively located at the sides close to the opening 141 of the tightening shield 140; the sealing covers 330 are welded and fixed to the inner wall of the tightening shield 140, so that the openings 141 on both sides are closed, and the driving device 600 passes through the sealing covers 330 and is connected to the tightening shoe 200. The two sealing covers 330 are arranged between the two first sealing plates 310, and are respectively welded and fixed to the first sealing plates 310 on both sides, so as to support the first sealing plates 310. At the same time, the first sealing plate 310 and the second sealing plate 320 are surrounded to form a rectangular frame, and the internal structure of the tunnel boring machine is arranged in the rectangular frame, so as to protect the internal structure of the tunnel boring machine and improve the sealing effect; and the sealing covers are separated from the driving device 600 of the tightening shoe 200, and are sealed independently from each other.

[0055] Meanwhile, wear-resistant strips are arranged around the opening 141 to seal the gap between the gripper shoe 200 and the peripheral wall of the opening 141 and reduce the wear around the opening 141 .

[0056] In some embodiments, reference Figures 2 to 5A reserved hole 321 is opened on the second sealing plate 320 , and a sealing member is provided on the reserved hole 321 to seal the gap between the hole wall of the reserved hole 321 and the pipeline of the driving device 600 .

[0057] By adopting the above technical solution, the seal seals the gap between the reserved hole 321 and the pipeline of the driving device 600, thereby facilitating the pipeline installation of the driving device 600 and achieving sealing at the reserved hole 321, thereby avoiding the existence of sealing loopholes and improving the sealing effect of the tunnel boring machine.

[0058] Specifically, the sealing member includes a sealing ring 322 , and the sealing ring 322 is sleeved on the hole wall of the reserved hole 321 .

[0059] The sealing ring 322 is an annular rubber ring. A mounting groove is provided on the wall of the reserved hole 321. The sealing ring 322 is embedded in the mounting groove. In addition, part of the sealing ring 322 protrudes out of the mounting groove and abuts against the pipeline of the driving device 600, thereby achieving a sealing effect.

[0060] The inner wall of the sealing ring 322 is provided with at least one groove along the axial direction of the sealing ring 322 , so that the sealing ring 322 forms a plurality of sealing sections, and the sealing sections are arc-shaped and concave toward the center of the reserved hole.

[0061] This makes it easier to compress the sealing ring 322 during the installation of the pipeline of the driving device 600, which not only facilitates the installation, but also improves the sealing effect and reduces the use of rubber materials.

[0062] Furthermore, the sealing member also includes an airbag 323 , which is embedded in the sealing ring 322 .

[0063] The airbag 323 is a circular airbag 323 adapted to the installation groove. When installing, the airbag 323 is first placed in the installation groove, and then the sealing ring 322 is partially embedded in the installation groove. The pipeline passes through the reserved hole 321 and abuts against the sealing ring 322 on the side wall of the reserved hole 321. By inflating the airbag 323, the sealing ring 322 and the pipeline are pressed tightly, thereby improving the sealing effect.

[0064] In some embodiments, reference Figures 1 to 5 , and also includes multiple propulsion cylinders 400. The support shoe 200 is provided with multiple through holes 210 arranged along the axial direction of the shield body 100. The multiple propulsion cylinders 400 are evenly arranged in the multiple through holes 210; a second sealing assembly 500 is also provided between the through holes 210 and the propulsion cylinder 400, and the second sealing assembly 500 is used to seal the gap between the propulsion cylinder 400 and the through holes 210.

[0065] The propulsion cylinder 400 penetrates the through hole 210 along the axial direction of the tightening shield 140. Since the relative positions of the gripper 200 and the tightening shield 140 are different in the first state and the second state, the diameter of the through hole 210 is greater than the diameter of the propulsion cylinder 400. When in the first state, the propulsion cylinder 400 is located at a side of the through hole 210 close to the inside of the tightening shield 140; when in the second state, the propulsion cylinder 400 is located at a side of the through hole 210 far from the inside of the tightening shield 140.

[0066] In some embodiments, reference Figures 1 to 5 The second sealing assembly 500 includes a first support sleeve 510 and a second sealing member 520. The first support sleeve 510 is disposed in the through hole 210. The propulsion cylinder 400 is disposed in the first support sleeve 510. The second sealing member 520 is disposed in the first support sleeve 510 and abuts against the propulsion cylinder 400. The second sealing member 520 is preferably an airbag.

[0067] Further, refer to Figure 1 and Figure 4 In the present embodiment, a second support sleeve 530 is further provided in the passage hole 210. The second support sleeve 530 is coaxially arranged with the first support sleeve 510. The second support sleeve 530 may also be connected to a baffle welded in the passage hole 210. The second sealing assembly 500 also includes a floating support. The floating support includes an inner ring and a plurality of elastic members. The inner ring is sleeved on the thrust cylinder 400. The plurality of elastic members are evenly distributed between the second support sleeve 530 and the inner ring along the circumference of the thrust cylinder 400. When the tunnel boring machine turns, the elastic member on one side of the thrust cylinder 400 is compressed, while the elastic member on the other side of the thrust cylinder 400 is pulled, thereby protecting the thrust cylinder 400 from damage. In the present embodiment, the elastic member is a spring.

[0068] On the other hand, the present application provides a tunnel boring machine, comprising a tunnel boring machine body and a double shield structure arranged on the tunnel boring machine body.

[0069] Among them, the double shield structure in this embodiment is the same as the double shield structure provided in any of the above embodiments, and can bring the same or similar technical effects, which will not be described one by one here, and the details can be referred to the description of the above embodiments.

[0070] The tunnel boring machine provided in the present application, through the arrangement of the first sealing plate 310 and the second sealing plate 320, the first sealing plate 310 isolates the interior of the shield body 100 from the external environment, so that the tunnel boring machine is in a sealed state in both earth pressure and TBM modes, and there is no need to remove the sealing mechanism, which is beneficial to saving the time of switching the tunnel boring machine modes, reducing the workload, and improving the construction efficiency of the tunnel boring machine. At the same time, the second sealing plate 320 and the sealing cover 330 wrap the driving device 600, thereby realizing the separate sealing of the driving device 600 and improving the sealing effect.

[0071] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the present application. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0072] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A double shield structure, characterized in that: It comprises a shield body (100), a driving device (600), a first sealing assembly (300) and two support shoes (200); The shield body (100) has two openings (141), and the gripper shoe (200) is movably arranged in the corresponding openings (141); so that the gripper shoe (200) partially extends out of the opening (141), or the surface of the gripper shoe (200) and the surface of the shield body (100) are located on the same circumference; The first sealing assembly (300) includes two first sealing plates (310) and two second sealing plates (320), wherein the first sealing plates (310) are arranged at the opening (141) of the shield body (100) and are connected to the inner side wall of the shield body (100) so as to isolate the interior of the shield body (100) from the external environment; the second sealing plates (320) are connected between the two first sealing plates (310) at intervals and form a sealed cavity with the first sealing plates (310), and the driving device (600) is arranged in the sealed cavity, and the driving device (600) partially extends out of the sealed cavity and is connected to the support shoe (200) so as to drive the support shoe (200) to move.

2. The double shield structure according to claim 1, characterized in that: The first sealing plate (310) is provided with a through hole (311) for the driving device (600) to extend out.

3. The double shield structure according to claim 1, characterized in that: The second sealing plate (320) is provided with a reserved hole (321), and the reserved hole (321) is provided with a sealing member for sealing a gap between a hole wall of the reserved hole (321) and a pipeline of the driving device (600).

4. The double shield structure according to claim 3, characterized in that: The sealing component comprises a sealing ring (322), and the sealing ring (322) is sleeved on the hole wall of the reserved hole (321).

5. The double shield structure according to claim 4, characterized in that: The sealing component further comprises an air bag (323), and the air bag (323) is embedded in the sealing ring (322).

6. The double shield structure according to claim 4, characterized in that: The inner wall of the sealing ring (322) is provided with at least one groove along the axial direction of the sealing ring (322), so that the sealing ring (322) forms a plurality of sealing sections, and the sealing sections are arc-shaped and concave toward the center of the reserved hole.

7. The double shield structure according to claim 2, characterized in that: The first sealing assembly (300) further comprises a sealing cover (330), wherein the sealing cover (330) is disposed on the driving device (600) and is respectively connected to the two first sealing plates (310).

8. The double shield structure according to any one of claims 1 to 6, characterized in that: It also includes a plurality of propulsion cylinders (400), the support boot (200) is provided with a plurality of through holes (210) arranged along the axial direction of the shield body (100), and the plurality of propulsion cylinders (400) are evenly arranged in the plurality of through holes (210); a second sealing assembly (500) is also provided between the through holes (210) and the propulsion cylinder (400), and the second sealing assembly (500) is used to seal the gap between the propulsion cylinder (400) and the through holes (210).

9. The double shield structure according to claim 8, characterized in that: The second sealing assembly (500) comprises a first supporting sleeve (510) and a second sealing member (520); the first supporting sleeve (510) is arranged in the through hole (210); the propulsion cylinder (400) is passed through the first supporting sleeve (510); and the second sealing member (520) is arranged in the first supporting sleeve (510) and abuts against the propulsion cylinder (400).

10. A tunnel boring machine, characterized in that: It comprises a tunnel boring machine body and a double shield structure as described in any one of claims 1 to 9 arranged on the tunnel boring machine body.

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