Sealing structure, telescopic shield and heading machine

Abstract

The utility model belongs to the technical field of tunneling equipment, and particularly provides a sealing structure, a telescopic shield and a tunneling machine. The sealing structure comprises a cylindrical supporting piece, an outer shield connecting piece and an inner shield connecting plate, the front end of the supporting piece is connected with the outer shield connecting piece, the rear end of the supporting piece is connected with the inner shield connecting plate through a detachable connecting piece, and a sealing ring mounting groove used for mounting an inner shield sealing ring is formed between the supporting piece and the inner shield connecting plate. An outer shield sealing piece and / or an outer shield connecting piece is arranged on the periphery of the supporting piece and is an outer shield connecting plate, and the outer shield sealing piece is arranged between the outer shield connecting plate and the supporting piece. The telescopic shield comprises the sealing structure. The heading machine comprises the telescopic shield and the sealing structure. When tunneling is conducted in a TBM mode, the supporting piece and the inner shield connecting plate can be separated, the supporting piece moves forwards along with the telescopic outer shield, no relative friction relation exists between the outer shield sealing piece and the telescopic outer shield, and abrasion of the sealing piece cannot be caused.

Description

Technical Field

[0001] The utility model belongs to the technical field of tunnel boring equipment, in particular to a sealing structure, a telescopic shield and a tunnel boring machine. Background Art

[0002] Full-section tunnel boring machines (hereinafter referred to as tunnel boring machines) have the advantages of safety and high efficiency, and are now widely used in railway, highway, hydropower and other tunnel construction projects. According to different working conditions such as geology, burial depth, water pressure, surface buildings, etc., tunnel boring machines include slurry shield machines, earth pressure balance shield machines, TBMs (hard rock tunnel boring machines) and other models. In a certain excavation interval, there may be various complex strata such as soft soil, mud bursts, water gushing, and broken zones. A single type of tunnel boring machine is difficult to meet the stable excavation of the excavation interval. Tunnel boring machines with two or even multiple excavation modes are the future development direction.

[0003] The double-shield TBM includes a front shield, a telescopic shield, a support shield and a segment assembler. The support shield is provided with support boots that can hold the tunnel wall tight. The telescopic shield includes a nested telescopic inner shield and a telescopic outer shield. The telescopic outer shield is connected to the front shield, and the telescopic inner shield is connected to the support shield. A main thrust cylinder is provided between the front shield and the support shield, and an auxiliary thrust cylinder for tightening the segments is provided on the support shield. In the double-shield mode, the support boots on the support shield hold the tunnel wall tight to provide reaction force and reaction torque for the main thrust cylinder. The main thrust cylinder provides thrust for the front shield and the cutterhead to move forward. The telescopic outer shield moves forward with the front shield. At this time, the segment assembler can synchronously assemble the segments, which has high efficiency when excavating in hard rock and strata with low requirements for surface settlement control accuracy.

[0004] However, for strata with certain water pressure, clay, low permeability coefficient, and high requirements for surface settlement control accuracy, the double shield TBM is difficult to use directly due to the reasons that the slag discharge circuit and the shield body cannot be completely sealed. Double shield-mud balance dual-mode tunnel boring machines or double shield-earth pressure balance dual-mode tunnel boring machines have begun to appear in the prior art. For example, a Chinese invention patent application with application publication number CN115992711A and application publication date 2023.04.21 discloses a dual-mode tunnel boring machine with double shield and mud water mode. In order to ensure basic sealing performance, the TBM is provided with a seal in the radial gap between the telescopic outer shield and the telescopic inner shield of the telescopic shield. In the mud water mode, the telescopic inner shield and the telescopic outer shield are connected and locked, and there is no relative sliding. However, in the TBM mode, there is relative movement between the telescopic outer shield and the telescopic inner shield. At this time, the seal between the telescopic inner shield and the telescopic outer shield is always in a worn state. In fact, if excavation starts from hard rock formations, the seals may have worn out and failed when excavation reaches the formation interval with higher requirements for surface settlement. Utility Model Content

[0005] The purpose of the utility model is to provide a sealing structure to solve the technical problem in the prior art that the seal between the telescopic inner shield and the telescopic outer shield is easily worn due to the relative sliding between the telescopic inner shield and the telescopic outer shield. The purpose of the utility model is also to provide a telescopic shield and a tunnel boring machine using the above sealing structure to solve the same technical problem.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the sealing structure provided by the utility model is:

[0007] A sealing structure comprises a cylindrical support member, an outer shield connecting member for fixed connection with a telescopic outer shield, and an inner shield connecting plate for fixed connection with a telescopic inner shield. The front end of the support member is connected to the outer shield connecting member, and the rear end of the support member is connected to the inner shield connecting plate via a detachable connecting member. A sealing ring mounting groove for mounting an inner shield sealing ring is provided between the support member and the inner shield connecting plate. An outer shield sealing member for cooperating with the telescopic outer shield seal and / or the outer shield connecting member is an outer shield connecting plate is provided on the outer periphery of the support member. An outer shield sealing member for cooperating with the outer shield seal is provided between the outer shield connecting plate and the support member.

[0008] As a further improvement, the outer shield seal is provided on the outer periphery of the support, and the outer shield connector is connected to the support via a detachable connector. When the inner shield connector plate is connected to the support, the outer shield connector is detached from the support.

[0009] As a further improvement, at least one seal installation groove for installing the outer shield seal is provided on the outer periphery of the support member.

[0010] As a further improvement, the outer periphery of the support member is sleeved with at least two spaced-apart retaining rings, and two side walls of at least one sealing member installation groove are formed by the two retaining rings.

[0011] As a further improvement, at least one retaining ring is a slip ring that can slide relative to the outer periphery of the support member, and the support member is also provided with a detachable stop structure for preventing the slip ring from falling off.

[0012] As a further improvement, the stop structure includes an adjusting rod mounting seat arranged on the support member, and the adjusting rod mounting seat is provided with an adjusting screw rod for pushing the slip ring to adjust the position of the slip ring.

[0013] As a further improvement, the support member is connected via a connecting ring and an outer shield connecting member, the connecting ring is mounted on the support member via a detachable connecting member, and the outer diameter of the connecting ring is larger than the outer diameter of the support member, and the portion of the connecting ring that exceeds the outer diameter of the support member forms an adjustment rod mounting seat.

[0014] As a further improvement, the rear end of the support member is provided with an integrated step protruding inwardly, and the support member is connected to the inner shield connecting plate via the step.

[0015] The beneficial effects of the utility model are as follows: the utility model belongs to a pioneering invention. When in use, the sealing structure and the telescopic outer shield can be connected through the outer shield connector, and the inner shield connecting plate can be connected to the telescopic inner shield. The front and rear ends of the support can be connected to the outer shield connector and the inner shield connecting plate respectively, and the inner shield connecting plate and the support are detachably connected. Since the outer shield seal is provided, the support and the telescopic outer shield are still sealed at this time. When in use, the inner shield seal can also be installed in the seal ring installation groove. At this time, the support and the inner shield connecting plate are also sealed. Therefore, the utility model meets the sealing performance of the shield body during excavation. Compared with the prior art, the support and the inner shield connecting plate in the utility model are detachably connected. In this way, when excavating in the TBM mode, that is, when the telescopic shield seal is not required, the support and the inner shield connecting plate can be separated. At this time, the support and the outer shield seal can move forward with the telescopic outer shield. There is no relative friction between the outer shield seal and the telescopic outer shield, so it will not cause wear of the seal.

[0016] To achieve the above purpose, the technical solution of the telescopic shield provided by the utility model is:

[0017] A telescopic shield comprises a telescopic inner shield and a telescopic outer shield, a sealing structure is arranged between the telescopic inner shield and the telescopic outer shield, the sealing structure comprises a cylindrical support, an outer shield connecting piece fixedly connected to the telescopic outer shield, and an inner shield connecting plate fixedly connected to the telescopic inner shield, the front end of the support is connected to the outer shield connecting piece, the rear end of the support is connected to the inner shield connecting plate through a detachable connecting piece, a sealing ring installation groove for installing an inner shield sealing ring is arranged between the support and the inner shield connecting plate, an outer shield sealing piece matching with the telescopic outer shield seal and / or the outer shield connecting piece is an outer shield connecting plate on the periphery of the support, and an outer shield sealing piece matching with the outer shield seal is arranged between the outer shield connecting plate and the support.

[0018] As a further improvement, the outer shield seal is provided on the outer periphery of the support, and the outer shield connector is connected to the support via a detachable connector. When the inner shield connector plate is connected to the support, the outer shield connector is detached from the support.

[0019] As a further improvement, at least one seal installation groove for installing the outer shield seal is provided on the outer periphery of the support member.

[0020] As a further improvement, the outer periphery of the support member is sleeved with at least two spaced-apart retaining rings, and two side walls of at least one sealing member installation groove are formed by the two retaining rings.

[0021] As a further improvement, at least one retaining ring is a slip ring that can slide relative to the outer periphery of the support member, and the support member is also provided with a detachable stop structure for preventing the slip ring from falling off.

[0022] As a further improvement, the stop structure includes an adjusting rod mounting seat arranged on the support member, and the adjusting rod mounting seat is provided with an adjusting screw rod for pushing the slip ring to adjust the position of the slip ring.

[0023] As a further improvement, the support member is connected via a connecting ring and an outer shield connecting member, the connecting ring is mounted on the support member via a detachable connecting member, and the outer diameter of the connecting ring is larger than the outer diameter of the support member, and the portion of the connecting ring that exceeds the outer diameter of the support member forms an adjustment rod mounting seat.

[0024] As a further improvement, the rear end of the support member is provided with an integrated step protruding inwardly, and the support member is connected to the inner shield connecting plate via the step.

[0025] The beneficial effects of the utility model are as follows: the utility model belongs to a pioneering invention. When in use, the sealing structure and the telescopic outer shield can be connected through the outer shield connector, and the inner shield connecting plate can be connected to the telescopic inner shield. The front and rear ends of the support can be connected to the outer shield connector and the inner shield connecting plate respectively, and the inner shield connecting plate and the support are detachably connected. Since the outer shield seal is provided, the support and the telescopic outer shield are still sealed at this time. When in use, the inner shield seal can also be installed in the seal ring installation groove. At this time, the support and the inner shield connecting plate are also sealed. Therefore, the utility model meets the sealing performance of the shield body during excavation. Compared with the prior art, the support and the inner shield connecting plate in the utility model are detachably connected. In this way, when excavating in the TBM mode, that is, when the telescopic shield seal is not required, the support and the inner shield connecting plate can be separated. At this time, the support and the outer shield seal can move forward with the telescopic outer shield. There is no relative friction between the outer shield seal and the telescopic outer shield, so it will not cause wear of the seal.

[0026] In order to achieve the above-mentioned purpose, the technical solution of the tunnel boring machine provided by the utility model is:

[0027] A tunnel boring machine comprises a telescopic shield, which comprises a telescopic inner shield and a telescopic outer shield. A sealing structure is arranged between the telescopic inner shield and the telescopic outer shield. The sealing structure comprises a cylindrical support member, an outer shield connecting member fixedly connected to the telescopic outer shield, and an inner shield connecting plate fixedly connected to the telescopic inner shield. The front end of the support member is connected to the outer shield connecting member, and the rear end of the support member is connected to the inner shield connecting plate via a detachable connecting member. A sealing ring mounting groove for mounting an inner shield sealing ring is arranged between the support member and the inner shield connecting plate. An outer shield sealing member cooperating with the telescopic outer shield seal and / or the outer shield connecting member is an outer shield connecting plate is arranged on the outer periphery of the support member. An outer shield sealing member cooperating with the outer shield seal is arranged between the outer shield connecting plate and the support member.

[0028] As a further improvement, the outer shield seal is provided on the outer periphery of the support, and the outer shield connector is connected to the support via a detachable connector. When the inner shield connector plate is connected to the support, the outer shield connector is detached from the support.

[0029] As a further improvement, at least one seal installation groove for installing the outer shield seal is provided on the outer periphery of the support member.

[0030] As a further improvement, the outer periphery of the support member is sleeved with at least two spaced-apart retaining rings, and two side walls of at least one sealing member installation groove are formed by the two retaining rings.

[0031] As a further improvement, at least one retaining ring is a slip ring that can slide relative to the outer periphery of the support member, and the support member is also provided with a detachable stop structure for preventing the slip ring from falling off.

[0032] As a further improvement, the stop structure includes an adjusting rod mounting seat arranged on the support member, and the adjusting rod mounting seat is provided with an adjusting screw rod for pushing the slip ring to adjust the position of the slip ring.

[0033] As a further improvement, the support member is connected via a connecting ring and an outer shield connecting member, the connecting ring is mounted on the support member via a detachable connecting member, and the outer diameter of the connecting ring is larger than the outer diameter of the support member, and the portion of the connecting ring that exceeds the outer diameter of the support member forms an adjustment rod mounting seat.

[0034] As a further improvement, the rear end of the support member is provided with an integrated step protruding inwardly, and the support member is connected to the inner shield connecting plate via the step.

[0035] The beneficial effects of the utility model are as follows: the utility model belongs to a pioneering invention. When in use, the sealing structure and the telescopic outer shield can be connected through the outer shield connector, and the inner shield connecting plate can be connected to the telescopic inner shield. The front and rear ends of the support can be connected to the outer shield connector and the inner shield connecting plate respectively, and the inner shield connecting plate and the support are detachably connected. Since the outer shield seal is provided, the support and the telescopic outer shield are still sealed at this time. When in use, the inner shield seal can also be installed in the seal ring installation groove. At this time, the support and the inner shield connecting plate are also sealed. Therefore, the utility model meets the sealing performance of the shield body during excavation. Compared with the prior art, the support and the inner shield connecting plate in the utility model are detachably connected. In this way, when excavating in the TBM mode, that is, when the telescopic shield seal is not required, the support and the inner shield connecting plate can be separated. At this time, the support and the outer shield seal can move forward with the telescopic outer shield. There is no relative friction between the outer shield seal and the telescopic outer shield, so it will not cause wear of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the main machine of the tunnel boring machine embodiment of the utility model when tunneling in TBM mode;

[0037] Figure 2 for Figure 1 Cross-sectional view of the center support shield position;

[0038] Figure 3 It is a schematic diagram of the main machine of the tunnel boring machine embodiment of the utility model when tunneling in the earth pressure mode;

[0039] Figure 4 for Figure 3 Cross-sectional view of the center support shield position;

[0040] Figure 5 It is a schematic diagram of the connection relationship of the sealing mounting seat of the tunnel boring machine embodiment of the utility model in the earth pressure mode;

[0041] Figure 6 It is a schematic diagram of the connection relationship of the sealing mounting seat of the tunnel boring machine embodiment of the utility model in the TBM mode;

[0042] Figure 7 for Figure 4 Schematic diagram of the sealing cooperation between the middle support shoe and the support shield body;

[0043] Figure 8 for Figure 1 Schematic diagram of the sealing cooperation between the middle push cylinder and the support shield.

[0044] Description of reference numerals:

[0045] 1. Cutterhead; 2. Front shield; 3. Telescopic shield; 4. Sealing structure; 5. Support shield; 6. Tail shield; 7. Screw machine installation hole; 8. Main machine belt conveyor; 9. Screw conveyor; 10. Rotary joint; 11. Segment assembly machine; 12. Propelling cylinder; 301. Telescopic outer shield; 302. Telescopic inner shield; 401. Support; 402. Step; 403. Connecting ring; 404. Adjusting screw; 405. Bolt assembly; 406. Retaining ring; 407. Rubber Rubber seal; 408, airbag; 409, finger seal; 410, sealing ring installation groove; 411, connecting screws; 412, outer shield connecting plate; 413, inner shield connecting plate; 501, support shield body; 502, support shoe cylinder; 503, support shoe; 504, support shoe seal; 505, oil filling hole; 506, slip ring; 507, slip ring seal; 1201, cylinder sealing ring; 1202, first cylinder seal; 1203, second cylinder seal. DETAILED DESCRIPTION

[0046] When excavating in hard rock formations, the double shield TBM can realize synchronous assembly of segments during the excavation process, which has high efficiency. However, the traditional double shield TBM is difficult to be directly used in formations with high requirements for surface settlement control. At this time, double shield TBMs with earth pressure mode or mud water mode began to appear according to different formations. In order to achieve earth pressure mode or mud water mode excavation, the shield body, main drive and other parts need to have a sealing effect.

[0047] In the prior art, a seal is generally provided between the outer wall of the inner telescopic shield and the inner wall of the outer telescopic shield. However, during excavation in the TBM mode, the seal provided between the inner telescopic shield and the outer telescopic shield is in a worn state due to the relative movement between the inner telescopic shield and the outer telescopic shield.

[0048] In order to solve the problem that the seal between the telescopic inner shield and the telescopic outer shield is easy to wear when excavating in TBM mode, the basic technical concept of the utility model is to set an independent sealing structure connected with the telescopic outer shield and the telescopic inner shield to play the role of sealing the telescopic shield, and when the sealing structure is connected to the inner shield, a part of it can be separated from the inner shield. When the TBM is excavating, the sealing structure is connected to the telescopic outer shield and excavates forward with the telescopic outer shield. At this time, there is no relative friction between the sealing structure and the telescopic outer shield, so the seal is prevented from being worn.

[0049] The present invention is further described in detail below in conjunction with the embodiments and drawings.

[0050] Specific embodiment 1 of the tunnel boring machine provided by the utility model:

[0051] like Figure 1 and Figure 3 As shown, this embodiment is described by taking a tunnel boring machine with earth pressure mode and TBM mode (open mode) as an example. The main machine part of the tunnel boring machine in this embodiment includes a cutter head 1, a front shield 2, a telescopic shield 3, a support shield 5, a tail shield 6, a segment assembly machine 11, a thrust cylinder 12, etc. The front shield 2 includes an annular outer shell and a front partition, on which a main drive is mounted, and the cutter head 1 is rotatably mounted on the main drive. A belt conveyor installation channel for installing a main machine belt conveyor is provided in the center of the front partition, and a screw machine installation hole 7 for installing a screw conveyor 9 is provided at the lower part.

[0052] In the TBM mode, the main machine belt conveyor 8 is installed, and the slag is discharged backward from the main machine belt conveyor 8. In the soil pressure mode, the screw conveyor 9 is installed, and the slag falls to the bottom and is discharged backward from the screw conveyor 9. In order to facilitate the discharge of the slag and form a soil plug effect, a swivel joint 10 can also be set at this time, and the slag improvement pipeline is connected through the swivel joint 10 to input the slag improvement agent into the soil bin. The specific working process of the two modes is the existing technology and will not be described in detail here.

[0053] The telescopic shield 3 includes a telescopic outer shield 301 and a telescopic inner shield 302. The telescopic outer shield 301 is connected to the front shield 2, and the telescopic inner shield 302 is connected to the support shield 5. A sealing structure 4 is provided between the telescopic inner shield 301 and the telescopic outer shield 302. The sealing structure 4 is as shown in FIG. Figure 5 and Figure 6As shown, the support member 401 includes a support member 401, which is a cylindrical structure as a whole. Specifically, it can be an integral structure processed in one piece, or it can be formed by splicing a plurality of split fan ring members. However, when splicing, the sealing effect should be ensured between the adjacent fan ring splicing surfaces. The front end of the support member 401 is connected with an outer shield connector for connecting to the telescopic outer shield 301, and the rear end is connected with an inner shield connecting plate 413 for connecting to the telescopic inner shield 302, and the inner shield connecting plate 413 and the support member 401 should be detachably connected, that is, connected by a detachable connector. When in use, the sealing structure 4 can be fixedly connected to the telescopic outer shield 301 through the outer shield connector, and fixedly connected to the telescopic inner shield 302 through the inner shield connecting plate 413. The sealing structure 4 also includes a sealing member that seals the support member 401 with the telescopic inner shield 302 and the telescopic outer shield 301. For the support member 401 and the telescopic inner shield 302, the inner shield sealing ring that plays a sealing role can be set between the matching end faces of the inner shield connecting plate 413 and the support member 401, that is, a sealing ring installation groove 410 can be set between the inner shield connecting plate 413 and the support member 401 (it can be set on one of the inner shield connecting plate 413 and the support member 401, or both), and the sealing ring can be installed in the sealing ring installation groove 410 when needed. For the support member 401 and the telescopic outer shield 301, the outer shield sealing member that plays a sealing role can be set between the outer periphery of the support member 401 and the inner wall surface of the telescopic outer shield 301; it can also be set between the matching end faces of the outer shield connecting member and the support member 401. In this case, the outer shield connecting member must also be a continuous plate-like structure. Figure 5 and Figure 6 Of course, sealing members can also be provided between the outer periphery of the support member 401 and the telescopic inner shield 301 and the mating end faces of the outer shield connecting plate 412 and the support member 401, which has a better sealing effect. It should be noted that when the sealing member is provided on the outer periphery of the support member 401, the outer shield connecting member does not necessarily have to be a continuous plate-like structure, and it can be a plurality of independent connecting members, which does not affect the sealing effect of the support member 401 and the telescopic outer shield.

[0054] The longitudinal section of the support member 401 is an L-shaped structure, and a step 402 protruding inward is provided at the rear end thereof. When in use, the step 402 and the inner shield connecting plate 413 can be connected by a bolt assembly 405. At this time, the step 402 and the inner shield connecting plate 413 are provided with corresponding bolt holes for the bolts of the bolt assembly 405 to pass through, which is simple and efficient. As another form of detachable matching, a light hole can be provided in one of the step 402 and the inner shield connecting plate 413, and a threaded hole can be provided in the other, and the step 402 and the inner shield connecting plate 41 can be connected by screws.

[0055] The support member is connected to the outer shield connection member via a connection ring 403, and the connection ring 403 is connected to the support member 401 via a connection screw 411. The connection ring 403 may be an integrally processed ring member, or may be formed by splicing a plurality of split fan ring members.

[0056] Regarding the connection and cooperation between the outer shield connector and the connection ring 403, this embodiment provides a detachable connection. Figure 6 As shown, when the outer shield connecting member is an outer shield connecting plate 412, the outer shield connecting plate 412 and the connecting ring 403 can also be connected by a bolt assembly 405. In this way, in the TBM mode, Figure 5 As shown, the outer shield connecting plate 412 and the connecting ring 403 can be disassembled and separated, that is, disassembled and separated from the telescopic outer shield 301. In order to ensure the sealing effect, the outer periphery of the support member 401 must be provided with a sealing member for sealing with the telescopic outer shield 301.

[0057] Specifically, the outer periphery of the support member 401 is provided with a seal installation groove for installing the seal, and the seal can be installed in the seal installation groove first when in use. The seal installation groove in this embodiment includes two arranged front and back, one of which is used to install the rubber seal 407, and the other can be used to install the airbag 408, and the airbag 408 can be inflated when in use. In order to further enhance the sealing performance, a finger seal 409 is also provided on the support member, and the finger seal 409 can be provided with screws and a pressure plate to be directly pressed on the outer periphery of the support member. Of course, the seal installation groove is provided to facilitate the installation of wider seals that cannot be installed with screws, such as the airbag 408. In other embodiments, multiple finger seals 409 arranged front and back can also be provided, and the seal installation groove may not be provided in this case.

[0058] As one implementation form of the seal installation groove, a groove may be directly machined on the periphery of the support member 401, such as a groove for installing the airbag 408. As another implementation form of the seal installation groove, at least two retaining rings 406 may be sleeved on the periphery of the support member 401, and the two retaining rings 406 may be spaced apart to form two side walls of the seal installation groove. The retaining ring may be directly fixed on the periphery of the support member 401, or at least one retaining ring may be configured as a slip ring that can slide relative to the support member 401. In this case, in order to prevent the slip ring from falling off, a stop structure to prevent the slip ring from falling off should be provided on the support member 401, and the stop structure should be detachable. Figure 5As shown, both retaining rings 406 are slip rings, so when installing the seal, the seal can be put on the support 401 from one side, and then the slip ring and the stop structure of the stop slip ring can be installed. This makes it easy to install the seal. Regarding the stop structure, since the seal installation groove for installing the airbag 408 in this embodiment is processed as one piece, when the retaining ring 406 at the rear is installed, the side wall of the seal installation groove for installing the airbag 408 can directly stop the slip ring at the rear. The outer diameter of the connecting ring 403 in this embodiment is larger than the outer diameter of the support 401, and the part that exceeds the support 401 forms a stop structure for the stop slip ring.

[0059] Since at least one slip ring is movable, the position of the slip ring can also be adjusted to change the size of the seal installation groove to accommodate seals of different widths. At this time, in order to ensure that the slip ring is compressed and actively adjust the position of the slip ring, an adjusting screw 404 for pushing the slip ring should be set on the stop structure. The end of the adjusting screw 404 can be pressed against the slip ring. Screwing the adjusting screw 404 can ensure that the slip ring is compressed, which is equivalent to a tightening screw, and change the position of the slip ring to ensure that seals of different widths are in a compressed state when in use. The adjusting screw 404 in this embodiment is directly mounted on the connecting ring 403, that is, the part of the connecting ring 403 that exceeds the support 401 forms an adjusting rod mounting seat for mounting the adjusting screw.

[0060] In addition, regarding the support shield 5, as Figure 2 and 4 As shown in FIG. 5 , it includes a support shield body 501, a support shoe cylinder 502 and a support shoe 503. The support shoe cylinder 502 is extended to push the support shoe 503 to move outward to support the cave wall. In the soil pressure mode, in order to ensure the sealing effect, a sealing member should also be provided between the support shoe 503 and the support shield body 501, such as Figure 7 As shown, two support shoe seals 504 are added between the support shoe 503 and the support shield body 501, and an oil injection hole 505 is provided between the two support shoe seals 504. When an emergency leak occurs, grease can be injected into the oil injection hole 504 to seal it. At the same time, in order to reduce the machined surface of the support shield body 501, a slip ring 506 can be added and installed on the support shield body 501 using screws, and the slip ring 506 and the support shield body 501 are sealed using a slip ring seal 507.

[0061] In the earth pressure mode, the propulsion cylinder 12 and the support shield 5 should also be sealed. Figure 8 As shown, a cylinder sealing ring 1201 can be added. The end of the cylinder sealing ring 1201 is sealed by a second cylinder seal 1203 and the partition of the support shield, and the inner circumference is sealed by a first cylinder seal 1202 and the cylinder barrel of the propulsion cylinder 12.

[0062] In this embodiment, when the TBM mode is on, Figure 6 As shown, the sealing structure 4 can be connected to the telescopic outer shield 301. At this time, there is relative friction between the telescopic outer shield 301 and the telescopic inner shield 302, but the telescopic inner shield 301 and the sealing structure 4 are relatively stationary, so there will be no wear on the seal. At this time, the seal may not be installed in the seal installation groove 410. In the soil pressure mode, the support member and the inner shield connecting plate need to be connected, and the seal needs to be installed in the seal installation groove 410.

[0063] Since the sealing mounting seat and the telescopic outer shield 301 in this embodiment are also detachable, the support member 401 and the outer shield connector can also be disassembled and separated in the earth pressure mode, and the telescopic outer shield 301 can move forward relative to the telescopic inner shield 302, and the synchronous assembly of the segments in the earth pressure mode can also be achieved, which is suitable for short-distance strata that require earth pressure mode excavation. However, at this time, the distance that the telescopic outer shield 301 moves forward cannot exceed the position of the sealing member.

[0064] In other embodiments, the connection relationship between the outer shield connector and the support member may also be a non-detachable connection. In this case, in the earth pressure mode, the synchronous assembly of the segments cannot be achieved. In this case, the sealing structure may be appropriately simplified, for example, only a sealing member that seals with the outer shield connector plate is provided on the connecting ring 403.

[0065] In other embodiments, the support member 401 may also be a thick-walled cylindrical member, in which case the step 402 and the connecting ring 403 may be omitted, and the end face of the support member 401 may be directly connected to the inner shield connecting plate and the outer shield connecting member, for example, threaded holes may be machined on the end face, and the outer shield connecting member and the inner shield connecting member may be connected to the support member 401 using screws. In this case, a slip ring may also be sleeved on the outer periphery of the support member 401, but an adjusting rod mounting seat capable of mounting an adjusting screw rod needs to be separately provided on the support member to ensure the stopping effect of the slip ring.

[0066] Specific embodiments of the sealing structure in the utility model:

[0067] The sealing structure is consistent with the sealing structure in the above-mentioned tunnel boring machine embodiment and will not be described in detail here.

[0068] Specific embodiments of the telescopic shield in the utility model:

[0069] The telescopic shield has the same structure as the telescopic shield in the above-mentioned tunnel boring machine embodiment, and will not be described in detail here.

[0070] Finally, it should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments without creative work, or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A sealing structure, characterized in that: The invention comprises a cylindrical support member, an outer shield connecting member for being fixedly connected to a telescopic outer shield, and an inner shield connecting plate for being fixedly connected to a telescopic inner shield. The front end of the support member is connected to the outer shield connecting member, and the rear end of the support member is connected to the inner shield connecting plate through a detachable connecting member. A sealing ring mounting groove for mounting an inner shield sealing ring is provided between the support member and the inner shield connecting plate. An outer shield sealing member for cooperating with the telescopic outer shield seal and / or the outer shield connecting member is an outer shield connecting plate is provided on the outer periphery of the support member. An outer shield sealing member for cooperating with the outer shield seal is provided between the outer shield connecting plate and the support member.

2. The sealing structure according to claim 1, characterized in that: The outer shield sealing member is arranged on the outer periphery of the supporting member, and the outer shield connecting member is connected to the supporting member through a detachable connecting member. When the inner shield connecting plate is connected to the supporting member, the outer shield connecting member is detached from the supporting member.

3. The sealing structure according to claim 1 or 2, characterized in that: At least one sealing member installation groove for installing an outer shield sealing member is arranged on the outer periphery of the supporting member.

4. The sealing structure according to claim 3, characterized in that: The outer periphery of the support member is sleeved with at least two retaining rings arranged at intervals, and two side walls of at least one sealing member installation groove are formed by the two retaining rings.

5. The sealing structure according to claim 4, characterized in that: At least one retaining ring is a slip ring that can slide relative to the outer periphery of the support member, and the support member is also provided with a detachable stop structure for preventing the slip ring from falling off.

6. The sealing structure according to claim 5, characterized in that: The stop structure comprises an adjusting rod mounting seat arranged on the supporting member, and the adjusting rod mounting seat is provided with an adjusting screw rod used for pushing the slip ring to adjust the position of the slip ring.

7. The sealing structure according to claim 6, characterized in that: The support is connected through a connecting ring and an outer shield connecting piece, the connecting ring is installed on the support through a detachable connecting piece, and the outer diameter of the connecting ring is larger than the outer diameter of the support, and the part exceeding the outer diameter of the support forms an adjusting rod mounting seat.

8. The sealing structure according to claim 1 or 2, characterized in that: The rear end of the support member is provided with an integrated step protruding inwards, and the support member is connected to the inner shield connecting plate via the step.

9. A telescopic shield, comprising a telescopic inner shield and a telescopic outer shield, wherein a sealing structure is provided between the telescopic inner shield and the telescopic outer shield, characterized in that: The sealing structure is the sealing structure described in any one of claims 1 to 8.

10. A tunnel boring machine, comprising a telescopic shield, the telescopic shield comprising a telescopic inner shield and a telescopic outer shield, a sealing structure is provided between the telescopic inner shield and the telescopic outer shield, characterized in that: The sealing structure is the sealing structure described in any one of claims 1 to 8.

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