A double shield tunnel boring machine

Abstract

The present invention belongs to the technical field of tunneling equipment and specifically provides a double-shield tunnel boring machine. The double-shield tunnel boring machine includes a support shield with a gripper shoe assembly mounted thereon, and also includes a sealing ring plate for corresponding connection to the perforations of the front and rear side plates. The sealing ring plate includes a side plate connecting portion for connection to the corresponding side plate and an insertion portion inserted into the corresponding perforation. When the sealing ring plate is connected to the side plate, a sealing ring is provided between the side plate connecting portion and the corresponding side plate. The end of the insertion portion is in close contact with the gripper shoe, with a sealing ring provided between the two. An end face sealing ring is provided at the edge of the inner support plate of the gripper shoe cavity. The position where each gripper shoe cylinder protrudes is located within the end face sealing ring and / or a sealing ring is provided on the outer periphery of the gripper shoe. In the present invention, when the support shield is switched from TBM mode to earth pressure or mud water mode, the sealing rings of each part can provide a better sealing effect, preventing a large amount of mud from flowing between the gripper shoe and the gripper shoe cavity wall, thereby improving the sealing performance at the support shield and gripper shoe positions.

Description

Technical Field

[0001] The invention belongs to the technical field of tunneling equipment, and in particular relates to a double-shield tunneling machine. Background Art

[0002] To address the construction conditions in different strata, full-face tunnel boring machines (TBMs) of various types, including earth pressure balance shields (EPBs), slurry balance shields, open-type TBMs (TBMs), and double-shield TBMs, have been widely used in projects such as subway tunnels, highway tunnels, pumped-storage power plants, and mining tunnels. Each model has its own suitable strata. However, in some construction projects, the entire construction area is often not a single stratum, but rather a mixture of hard rock and soft soil. This requires the TBM to have different operating modes.

[0003] Patent application publication number CN116378690A discloses a tunneling machine based on a double-shield TBM. Similar to conventional double-shield TBMs, this machine comprises a telescopic outer shield, a telescopic inner shield, and a support shield (i.e., a tensioning shield). The rear end of the telescopic outer shield and the front end of the telescopic inner shield are nested and slidably engaged. The rear end of the telescopic inner shield is connected to the support shield, which is equipped with gripper devices for tightening the tunnel wall. In TBM mode, the machine operates in the same principle as a conventional double-shield TBM. To maintain pressure during earth pressure mode and prevent mud from entering the tunneling machine, the machine is equipped with three sealing units: the first sealing unit seals the gripper cavity and the tunneling machine cavity; the second sealing unit seals the radial gap between the telescopic inner and outer shields; and the third sealing unit seals the gap between the telescopic inner shield and the support shield. In earth pressure mode, all sealing units are in place, ensuring proper operation of the earth pressure mode.

[0004] Specifically, in the above patent application, the first sealing unit seals two positions. One is that a sealing ring is set at the movable hole for the support shoe cylinder to pass through, which is set on the inner support plate of the support shield corresponding to the support shoe cavity, so as to prevent mud from entering the inner cavity of the tunneling equipment through the movable hole; the second is that a support ring frame is welded at the through-hole for the thrust cylinder (auxiliary thrust cylinder) to pass through, which is set on the front side plate and the rear side plate of the support shield corresponding to the support shoe cavity, and a sealing ring is set between the support ring frame and the thrust cylinder to prevent mud from flowing into the interior of the tunneling equipment through the through-hole.

[0005] Regarding the sealing of the support shield and gripper cavity walls, the aforementioned patent application only considered how to prevent mud from entering the tunneling equipment, and the locations of the various sealing rings were selected based on this concept. However, in reality, mud still enters the gripper cavity from all sides through the gaps between the gripper cavity walls and the gripper shoes. Specifically, mud primarily accumulates in two locations: First, although sealing rings are installed at each movable hole, mud still enters the gap between the inner support plate and the gripper shoe, outside the movable hole sealing rings. This mud is difficult to drain, and long-term tunneling can easily cause corrosion of the inner support plate. Second, although sealing rings are installed between the thrust cylinder and the support ring frame, the gaps between the gripper shoe and the front and rear side plates can still be filled with mud. This mud often contains a mixture of debris, soil, and water. This can easily cause the gripper shoe to become stuck and unable to extend when switching to TBM mode after the earth pressure mode ends, resulting in a failed mold change. In other words, there is still room for improvement in the sealing performance of the support shield and gripper shoe locations. Summary of the Invention

[0006] The object of the present invention is to provide a double-shield tunnel boring machine to solve the technical problem of insufficient sealing performance at the support shield and support shoe positions of the double-shield tunnel boring machine in the prior art.

[0007] To achieve the above objectives, the technical solution of the double shield tunneling machine provided by the present invention is:

[0008] A double-shield tunnel boring machine comprises a support shield, on which a support shoe assembly is mounted, the support shield comprising a support shoe and a support shoe cylinder, the support shield is provided with a support shoe cavity, the front and rear side plates of the support shoe cavity are provided with through holes for the auxiliary thrust cylinder to pass through, and further comprising a sealing ring plate for corresponding connection to the through holes of the front and rear side plates, the sealing ring plate comprising a side plate connecting portion for connection to the corresponding side plate and an insertion portion inserted into the corresponding through holes, when the sealing ring plate is connected to the side plate, a sealing ring is provided between the side plate connecting portion and the corresponding side plate, the end of the insertion portion is in close contact with the support shoe and a sealing ring is provided between the two; an end face sealing ring is provided at the edge of the inner support plate of the support shoe cavity, the position where each support shoe cylinder passes through is located inside the end face sealing ring and / or a sealing ring is provided on the outer peripheral sleeve of the support shoe.

[0009] As a further improvement, the part of the inner support plate located inside the end face sealing ring is provided with a plurality of bolt holes for the tensioning bolts to pass through, and the support shoe is provided with threaded holes at the position corresponding to each bolt hole. Under soil pressure or mud water mode, the tensioning bolts are installed through the bolt holes to fasten the support shoe and the inner support plate.

[0010] As a further improvement, the bolt holes are arranged in a vertical row and are respectively located at the front and rear ends of the middle position of the inner support plate.

[0011] As a further improvement, the sealing ring sleeved on the outer periphery of the gripper shoe is an inflatable and deflable airbag sealing ring, and the air nozzle of the airbag sealing ring passes through the shoe plate of the gripper shoe and extends to the inside of the gripper shoe.

[0012] As a further improvement, two end face sealing rings are provided, wherein the sealing ring located on the outside is a steamed bun-shaped sealing ring or an O-shaped sealing ring, and the sealing ring located on the inside is an inflatable and deflable airbag sealing ring, the air nozzle of the airbag sealing ring extends through the inner support plate to the inside of the support shield.

[0013] As a further improvement, in the telescopic shield of the double-shield tunnel boring machine, a plurality of oiling nozzles for connecting to oiling pipes to inject grease into the gap between the telescopic inner shield and the telescopic outer shield are installed on the telescopic inner shield.

[0014] As a further improvement, at least two annular radial seals are provided between the telescopic inner shield and the telescopic outer shield, and the outlet of part of the oiling nozzle is located between the front and rear two radial seals.

[0015] As a further improvement, a slag-blocking ring and a finger-shaped sealing ring are installed at the rear end of the telescopic outer shield, and the finger-shaped sealing ring is located in front of the slag-blocking ring.

[0016] As a further improvement, the radial seal is a rubber seal with a set hardness.

[0017] As a further improvement, in the telescopic shield of the double-shield tunnel boring machine, support blocks are installed between the telescopic inner shield and the telescopic outer shield at different circumferential positions for abutting the inner wall of the telescopic outer shield to support the telescopic inner shield.

[0018] As a further improvement, a guide seat is installed on the telescopic inner shield, and each support block is guided and installed in the guide seat, wherein the guide direction is the radial direction of the telescopic inner shield. A driving cylinder for driving the support block to move is also installed on the telescopic inner shield.

[0019] The present invention is an improved invention, and its beneficial effect is: when the double-shield tunnel boring machine needs to switch from TBM mode to earth pressure or mud water mode, the sealing ring plate can be installed at each perforation accordingly, wherein the side plate connecting part and the side plate of the sealing ring plate are sealed by a sealing ring, and the insertion part and the support shoe are sealed by a sealing ring. This first ensures that no mud will enter the interior of the tunnel boring machine from the perforation. In addition, no mud will enter the area within the sealing ring between the insertion part and the support shoe, thereby reducing the volume of the space corresponding to the gap between the support shoe and the wall of the support shoe cavity, thereby avoiding excessive mud influx.

[0020] At the same time, with the solution of providing an end face sealing ring at the edge of the inner support plate, the end face sealing ring can seal all the movable holes for the gripper cylinders to pass through. Compared with the prior art method of providing a separate seal for each movable hole, this can prevent mud from flowing into the gap between the gripper and the inner support plate, and also reduce the volume of the space corresponding to the gap between the gripper and the gripper cavity wall (i.e., the space accessible to mud). With the solution of providing a sealing ring on the outer periphery of the gripper, the outer peripheral sealing ring can directly seal the gap between the outer periphery of the gripper and the gripper cavity wall, thereby directly preventing mud from flowing into the position of the inner support plate, and also reducing the volume of the space corresponding to the gap between the gripper and the gripper cavity wall (i.e., the space accessible to mud). Of course, the coexistence of the end face sealing ring and the gripper periphery sealing ring can achieve a better sealing effect.

[0021] From the above analysis, it can be seen that when the support shield in the present invention switches from TBM mode to earth pressure or mud water mode, the sealing rings of each part can achieve a better sealing effect, thereby preventing a large amount of mud from flowing into the space between the gripper shoe and the gripper shoe cavity wall, thereby improving the sealing performance at the support shield and gripper shoe positions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the structure of a double-shield tunnel boring machine in TBM mode according to an embodiment of the present invention;

[0023] Figure 2 Schematic diagram of the structure of a double-shield tunnel boring machine in an embodiment of the present invention in earth pressure mode;

[0024] Figure 3 is a cross-sectional view of a support shield in an embodiment of a double-shield tunnel boring machine according to the present invention;

[0025] Figure 4 for Figure 3 A partial enlarged view of point A in the middle;

[0026] Figure 5 for Figure 4 A partial schematic diagram of the sealing position of the middle support shoe and the support shield (the viewing angle is along the movement direction of the support shoe);

[0027] Figure 6 for Figure 3 A partial enlarged view of point B in the middle;

[0028] Figure 7 for Figure 6 sectional view of

[0029] Figure 8 A partial cross-sectional view of the telescopic shield of an embodiment of a double-shield tunnel boring machine according to the present invention (showing the articulated cylinder);

[0030] Figure 9A partial cross-sectional view of the telescopic shield of an embodiment of a double-shield tunnel boring machine according to the present invention (with the articulated cylinder hidden);

[0031] Figure 10 A partial cross-sectional view of the telescopic shield of an embodiment of a double-shield tunnel boring machine in the present invention (TBM mode);

[0032] Figure 11 A partial cross-sectional view of the telescopic shield of an embodiment of a double-shield tunnel boring machine according to the present invention (with support blocks);

[0033] Figure 12 A cross-sectional view of a telescopic shield of a double-shield tunnel boring machine embodiment of the present invention (with support blocks);

[0034] Figure 13 for Figure 12 A partial enlarged view of the position of the middle support block.

[0035] Description of reference numerals:

[0036] 1. Cutterhead; 2. Main drive; 3. Front shield; 4. Man cabin; 5. Telescopic shield; 501. Telescopic outer shield; 502. Telescopic inner shield; 503. Radial seal; 504. Articulated seal ring; 505. Telescopic shield connecting bolt; 506. First seal ring; 507. Grease chamber; 508. Grease nozzle; 509. Slag ring; 510. Finger seal ring; 6. Main push cylinder; 7. Torque arm; 8. Support shield; 9. Gripper assembly; 901. Gripper; 902. Gripper cylinder; 10. Auxiliary push cylinder; 11. Tail shield; 12. Segment assembly machine; 13. Center belt conveyor; 14. Slag discharge mechanism; 15. Hinge Connect the oil cylinder; 1501, first airbag sealing ring; 1502, second airbag sealing ring; 1503, steamed bun-shaped sealing ring; 1504, bolt hole; 1601, sealing ring plate; 1602, ring plate connecting bolt; 1603, second sealing ring; 1604, third sealing ring; 17, slag sliding mechanism; 1801, guide seat; 1802, support block; 1803, support block connecting bolt; 1804, support block seal; 1805, oil cylinder radial seal; 1806, oil cylinder end face seal; 1807, drive oil cylinder; 1808, oil cylinder connecting bolt. DETAILED DESCRIPTION

[0037] To improve the sealing performance of the support shield of a double-shield tunnel boring machine operating in shield (earth pressure or mud-water) mode, the basic technical concept of this invention is to add sealing ring plates to the auxiliary thrust cylinder perforations when switching to shield mode. Seals are also provided at the contact ends between the sealing ring plates and the gripper shoes. Larger sealing rings are also positioned at appropriate locations within the gripper shoe cavities, ensuring that the exit points of each gripper shoe cylinder are located within the sealing rings. These seals work together to reduce the volume of the gap or space between the gripper shoes and the support shield, potentially allowing for mud inflow, thereby preventing the influx of large amounts of mud. The invention is further described below with reference to examples and accompanying drawings.

[0038] Specific embodiments of the double shield tunneling machine provided by the present invention:

[0039] First, taking the earth pressure-TBM double shield tunnel boring machine as an example, the double shield tunnel boring machine provided in this embodiment has an earth pressure mode and a TBM mode. Specifically, the same as the existing double shield tunnel boring machine is that Figure 1 and Figure 2 As shown, it includes a cutterhead 1, a main drive 2, a front shield 3, a telescopic shield 5, a tail shield 11, a main push cylinder 6, an auxiliary push cylinder 10, etc. The cutterhead 1 is installed on the main drive 2, and the main drive 2 is installed on the front shield 3. Under the driving action of the main drive 2, the cutterhead 1 can rotate and squeeze the rock. A torque arm 7 is connected between the front shield 3 and the support shield 8, which can be corrected in time by the torque arm 7 after the front shield 3 rolls. A segment assembly machine 12 is installed on the support shield 8, and the segment assembly machine 12 is consistent with the existing technology. A main push cylinder 6 is connected between the front shield 3 and the support shield 8, and an auxiliary push cylinder 10 is installed on the support shield 8. Consistent with the existing technology, the telescopic shield 5 includes a telescopic inner shield 502 and a telescopic outer shield 501. The telescopic inner shield 502 is connected to the support shield 8, and the telescopic outer shield 501 is connected to the front shield 3. See Figures 8-12 One end of the telescopic inner shield 502 is nested in the telescopic outer shield 501. In addition, the telescopic inner shield 502 and the support shield 8 are connected by an articulated oil cylinder 15. A gripper shoe assembly 9 is mounted on the support shield 8. Specifically, a gripper shoe cavity for accommodating the gripper shoe 901 is provided on the support shield 8. Consistent with the prior art, the gripper shoe cavity is formed by side panels at various positions on the support shield 8. The side panel for fitting with the end of the gripper shoe 901 away from the arc-shaped end can be defined as an inner support panel, and the two side panels spaced apart and extending vertically can be defined as a front side panel and a rear side panel. Figure 3As shown, the gripper shoe assembly 9 includes a gripper shoe 901 and a gripper shoe cylinder 902. Under the thrust of the gripper shoe cylinder 902, the gripper shoe 901 can extend outward from the gripper shoe cavity to hold the tunnel wall tightly. Naturally, a hole is provided on the inner support plate for the gripper shoe cylinder 902 to pass through. In order to facilitate the installation of the auxiliary thrust cylinder 10, the corresponding positions of the support shield 8, i.e., the front and rear side plates that enclose the gripper shoe cavity and the corresponding positions of the gripper shoe 901, are provided with holes that allow the auxiliary thrust cylinder 10 to pass through. This hole is relatively large, and the condition that needs to be met is that the auxiliary thrust cylinder 10 cannot interfere with the normal outward extension of the gripper shoe 901. Specifically, it can be adopted Figure 3 The "waist-shaped" shape is shown, and the auxiliary thrust cylinder 10 is just close to the upper and lower side walls of the perforation. In this way, the opening area is small while ensuring the normal operation of the support shoe 901.

[0040] TBM mode Figure 1 As shown, in this mode, the central belt conveyor 13 is used to discharge slag. The slag chute on the back of the cutterhead 1 scoops up the slag from the soil bin and drops it onto the central belt conveyor 13 via the slag chute mechanism 17, where it is then transported backwards. During forward excavation, the grippers 901 in the support shield 8 extend to hold the tunnel wall. The inner telescopic shield 502 and outer telescopic shield 501 in the telescopic shield 5 are disconnected. The main push cylinder 6 extends and retracts, propelling the front shield 3 and the outer telescopic shield 501 forward together. The segment assembler 12 at the rear can assemble the segments simultaneously. After one stroke of forward excavation, the grippers 901 retract, and the auxiliary push cylinder 10 extends to push the segments forward, propelling the support shield 8 forward one stroke.

[0041] Earth pressure mode Figure 2 As shown, in this mode, a slag discharge mechanism 14 (e.g., a screw conveyor) is used to discharge slag. To change modes, the central belt conveyor 13 must be removed and the passage on the front shield 3 through which the front end of the central belt conveyor 13 passes into the soil bin must be sealed. The slag discharge mechanism 14 is installed, and the slag in the soil bin is discharged backwards through the slag discharge mechanism 14. In the soil pressure mode, the gripper shoes 901 in the support shield 8 are retracted and no longer extended, and as shown in FIG. Figure 9 As shown, telescopic shield connecting bolts 505 are used to connect the telescopic inner shield 502 and the telescopic outer shield 501, and the auxiliary thrust cylinder 10 is used to push the pipe segment to achieve forward excavation. In the earth pressure mode, in order to form a stable soil plug effect and prevent mud from flowing into the excavation equipment, sealing units are also required at corresponding locations, including the seals at the gripper shoe cavity and gripper shoe 901 of the support shield 8, the seal between the telescopic inner shield 502 and the telescopic outer shield 501, and the seal between the telescopic inner shield 502 and the support shield 8. Figure 9 and Figure 10As shown, a first sealing ring 506 can be provided at the axial upper end of the telescopic inner shield 502 and the telescopic outer shield 501. The specific type of the first sealing ring 506 is not limited and can be consistent with the prior art. The seal between the telescopic inner shield 502 and the support shield 8 can adopt an articulated sealing ring 504 consistent with the prior art. The type of the articulated sealing ring 504 is not specifically limited here.

[0042] The above briefly describes the basic structure and working principle of the double-shield tunnel boring machine in this embodiment. The parts not explicitly described are consistent with the existing technology. The following mainly describes in detail the sealing at the position of the support shoe 901 and the radial gap between the telescopic inner shield 502 and the telescopic outer shield 501 in the telescopic shield 5.

[0043] First, regarding the sealing of the shoe 901 and the shoe cavity position, as a basic implementation method, Figure 3 、 Figure 6 and Figure 7 As shown, at the front and rear side plates of the support shoe cavity, the double shield tunneling machine is equipped with sealing ring plates 1601. The sealing ring plates 1601 correspond to the number of perforations and are connected to the corresponding front side plates or side plates. Specifically, the sealing ring plates 1601 include a side plate connecting portion and an inserting portion. The side plate connecting portion is used to connect to the corresponding side plate, and the inserting portion is used to insert into the perforations on the corresponding side plate. In this case, the auxiliary thrust cylinder 10 actually passes through the inner hole of the sealing ring plate 1601. A sealing ring is provided between the side plate connecting portion and the corresponding side plate in the support shield 8, that is, Figure 7 The second sealing ring 1603 in the inserting portion is in close contact with the support shoe 901, and a sealing ring is also provided between the end of the inserting portion and the support shoe 901, that is, Figure 7 Similarly, the types of the second sealing ring 1603 and the third sealing ring 1604 are not specifically limited here. On the basis of understanding the location of the sealing ring, those skilled in the art are capable of selecting different sealing rings.

[0044] From the above structure, we can see that under the earth pressure mode, mud can be easily Figure 7 The gap between the side plate of the support shield 8 and the gripper shoe 901 shown enters the gripper shoe cavity. It should be noted that for the convenience of drawing, Figure 7 This gap is not shown in the figure. Under the action of the second sealing ring 1603 and the third sealing ring 1604, the mud entering the shoe cavity will not enter the interior of the roadheader through the gap between the sealing ring plate 1601 and the side plate at the corresponding position, and the gap between the sealing ring plate 1601 and the auxiliary thrust cylinder 10, thus achieving a basic sealing effect. In addition, see Figure 3 and Figure 7Each third sealing ring 1604 can actually define a sealed area, which will greatly reduce the volume corresponding to the gap between the side plate and the support shoe 901 for mud to enter. This means that in the earth pressure mode, a large amount of mud will not enter the gap between the side plate and the support shoe 901. If the TBM mode is switched, it is not easy to cause the support shoe 901 to get stuck.

[0045] As an embodiment for facilitating the disassembly and assembly of the sealing ring plate 1601, Figure 6 and Figure 7 As shown, the sealing ring plate 1601 can be connected to the corresponding side plate by using the ring plate connecting bolts 1602. When connecting, adjusting the ring plate connecting bolts 1602 can also ensure that the second sealing ring 1603 and the third sealing ring 1604 have sufficient compression. Of course, in other embodiments, the use of rivet fasteners to connect the sealing ring plate 1601 is not excluded. In fact, if the first half of the construction project is a hard rock formation and the second half is a soft soil formation with poor stability, the entire construction process only requires changing the mold once, that is, switching from TBM mode to earth pressure mode. In this embodiment, the method of directly welding the sealing ring plate 1601 to the corresponding side plate is not excluded.

[0046] In addition, regarding the sealing of the movable hole provided on the support shield 8 for the gripper shoe cylinder 902 to pass through, the prior art only corresponds to installing a sealing ring at the movable hole, which is obviously unreliable. In fact, a large amount of mud still enters between the gripper shoe 901 and the inner support plate. In order to solve this problem, there are actually three possible implementation methods. As a first implementation method, Figure 4 and Figure 5 For example, a larger end face sealing ring can be set at the edge of the inner support plate of the gripper shoe cavity to ensure that all the positions where the gripper shoe cylinders 902 pass through are located within the end face sealing ring. In this case, the end face sealing ring can actually basically block the mud from entering the gripper shoe 901 and the inner support plate. As a second embodiment, Figure 4 For example, a sealing ring can be set on the outer periphery of the support shoe 901, which can directly block the path of mud entering the inner support plate. Accordingly, a ring groove for the sealing ring needs to be set on the support shoe 901. Figure 4 For example, the sealing ring on the outer periphery of the support shoe 901 and the end face sealing ring provided at the inner support plate can coexist, which has a more reliable sealing effect.

[0047] In the above embodiment, the end face sealing ring and the sealing ring on the outer periphery of the support shoe 901 can not only protect the inner support plate, but also cooperate with the third sealing ring 1604 between the sealing ring plate 1601 and the support shoe 901 to reduce the volume corresponding to the gap between the cavity walls of the support shoe and the support shoe 901, thereby ensuring that there will not be too much mud pouring in when excavating in the earth pressure mode.

[0048] As a preferred embodiment, Figure 4 As shown, the sealing ring on the periphery of the support shoe 901 can adopt an inflatable airbag sealing ring, that is, the first airbag sealing ring 1501, wherein the air nozzle of the first airbag sealing ring 1501 passes through the shoe plate of the support shoe 901 and extends to the inside of the support shoe 901. It should be noted here that those skilled in the art understand that the support shoe 901 is generally a box-shaped structure composed of shoe plates. In this way, in the TBM mode, the first airbag sealing ring 1501 does not need to be inflated, and can actually be retracted into the annular groove, and naturally will not be worn by the back and forth movement of the support shoe 901. When switching to the earth pressure mode, the first airbag sealing ring 1501 can be inflated. However, in reality, if in the construction project, the first half is a soft soil formation and the second half is a hard rock formation, the entire construction process only needs to change the mold once, that is, switch from the earth pressure mode to the TBM mode. At this time, the sealing ring on the periphery of the support shoe 901 can adopt a general rubber sealing ring, and no sealing is required in the TBM mode in the later stage, and even if it is worn, it will not affect the actual excavation. Combined with Figure 3 It should also be noted that the sealing ring on the outer periphery of the gripper shoe 901 , namely the first airbag sealing ring 1501 , is located at one end of the gripper shoe 901 close to the inner support plate, so as to prevent the first airbag sealing ring 1501 from interfering with the auxiliary thrust cylinder 10 .

[0049] As another preferred embodiment, Figure 4 As shown, two end face sealing rings are provided. The inner sealing ring is an inflatable and deflable airbag sealing ring, namely the second airbag sealing ring 1502, and the outer sealing ring is a steamed bun-shaped sealing ring 1503 (with a steamed bun-shaped cross-section). The air nozzle of the second airbag sealing ring 1502 extends through the inner support plate into the interior of the support shield 8. Here, the two end face sealing rings cooperate, and the steamed bun-shaped sealing ring 1503 is positioned on the outside to protect the second airbag sealing ring 1502 from being punctured by invading gravel. At the same time, after the second airbag sealing ring 1502 is inflated, it can ensure that the gap is reliably sealed. In other embodiments, the steamed bun-shaped sealing ring 1503 can be replaced with an O-ring. It should be noted that in other embodiments, the use of steamed bun-shaped sealing rings or airbag sealing rings is not excluded.

[0050] As a more reliable sealing method, Figure 5 As shown, the inner support plate is provided with multiple bolt holes 1504 for tensioning bolts, located within the end face sealing ring. Gripper shoe 901 has threaded holes corresponding to these holes. In earth pressure mode, after the gripper shoe 901 is retracted, tensioning bolts can be inserted through the bolt holes 1504 and connected to the threaded holes, thereby securing the gripper shoe 901 to the support plate. Due to the intense vibrations experienced by the entire machine during excavation, this prevents the gripper shoe 901 from wobbling within the gripper cavity. This ensures that the end face sealing ring is compressed while also preventing any potential warping or failure of the end face sealing ring due to vibration from the gripper shoe 901.

[0051] In a further optimized embodiment, Figure 5 As shown, bolt holes 1504 are arranged vertically in a row and are located at the front and rear ends of the middle portion of the inner support plate. The middle portion is farther from the gripper cylinder 902, and the end face seal in this area is less tightly attached. The provision of bolt holes 1504 can strengthen the sealing effect in this area.

[0052] The following focuses on the seal between the telescopic inner shield 502 and the telescopic outer shield 501 in the telescopic shield 5. Figure 9 and Figure 10 As shown, the telescopic inner shield 502 is equipped with multiple grease nipples 508. In the earth pressure mode, the grease nipples 508 can be connected to the grease pipe to inject grease into the gap between the telescopic inner shield 502 and the telescopic outer shield 501, namely, the grease chamber 507. This creates a positive pressure seal, flushing out any mud that enters. Specifically, the grease nipples 508 can be evenly distributed along the circumference of the telescopic inner shield 502, and the specific number is not limited.

[0053] In addition to the above-mentioned provision of the oiling nozzle 508 to achieve positive pressure sealing, in a preferred embodiment, as Figures 8-10 As shown, two annular radial seals 503 are disposed between the telescopic inner shield 502 and the telescopic outer shield 501, arranged in a front-to-rear (axial) direction. The outlet of a portion of the grease nozzle 508 is located between the front and rear radial seals 503. The telescopic inner shield 502, the telescopic outer shield 501, and the front and rear radial seals 503 form a substantially closed inner cavity. The grease in this cavity can build up a certain pressure, thereby forming a grease seal with a certain length in the axial direction.

[0054] The radial seal 503 is preferably a rubber seal with a set hardness. It can be installed on either the telescopic inner shield 502 or the telescopic outer shield 501. The radial seal 503 is non-removable, so the rubber seal's hardness must be high, otherwise it will easily wear out and fail during TBM operation. Compared to rigid seals (steel rings), a rubber seal with a set hardness provides basic support while also preventing complete immobilization between the telescopic inner shield 502 and the telescopic outer shield 501 during turning and steering operations.

[0055] In a further preferred embodiment, Figure 9 and Figure 10As shown, a slag-blocking ring 509 and a finger-shaped sealing ring 510 are installed at the rear end of the telescopic outer shield 501, wherein the finger-shaped sealing ring 510 is located in front of the slag-blocking ring 509. The slag-blocking ring 509 can block larger pieces of slag and stones, and the finger-shaped sealing ring 510 can provide a preliminary barrier to mud, which further improves the sealing performance between the telescopic inner shield 502 and the telescopic outer shield 501.

[0056] Considering that in actual construction projects, there are complex strata with alternating soft soil and hard rock. In TBM mode, the telescopic inner shield 502 and the telescopic outer shield 501 slide against each other, which can easily cause wear of the sealing structure between the telescopic inner shield 502 and the telescopic outer shield 501. After wear, the telescopic inner shield 502 and the telescopic outer shield 501 will have misalignment problems. At this time, when switching to earth pressure mode, the telescopic shield connecting bolts 505 may not be installed. To solve this problem, as a preferred embodiment, Figure 11-13 As shown, support blocks 1802 are installed at different circumferential locations between the telescopic inner shield 502 and the telescopic outer shield 501. These support blocks 1802 are used to abut the inner wall of the telescopic outer shield 501 to support the telescopic inner shield 502. Specifically, the support blocks 1802 can be installed on either the telescopic inner shield 502 or the telescopic outer shield 501 and are preferably evenly distributed around the circumference. The installation of support blocks 1802 provides a certain degree of support, thereby preventing significant eccentricity and misalignment between the telescopic inner shield 502 and the telescopic outer shield 501, and ensuring proper installation of the telescopic shield connecting bolts 505.

[0057] In a further preferred embodiment, Figure 11-13 For example, a guide seat 1801 is installed on the telescopic inner shield 502, and each support block 1802 is guided and installed in the guide seat 1801, wherein the guiding direction is the radial direction of the telescopic inner shield 502. In addition, a driving cylinder 1807 for driving the support block 1802 to guide and move is also installed on the telescopic inner shield 502. In the case that some support blocks 1802 are severely worn, the driving cylinder 1807 can be adjusted to extend, and the driving support block 1802 can be supported to support the telescopic outer shield 501 to compensate for the wear of the support block 1802 at this position, thereby ensuring that the telescopic inner shield 502 and the telescopic outer shield 501 are reliably coaxial. At the same time, in the TBM mode, the driving cylinder 1807 can drive the support block 1802 to retract, thereby not affecting the movement between the telescopic inner shield 502 and the telescopic outer shield 501 when turning. Specifically, Figure 13For example, the guide seat 1801 can be welded to the telescopic inner shield 502, the driving cylinder 1807 can be mounted on the guide seat 1801 via cylinder connecting bolts 1808, and the piston rod of the driving cylinder 1807 is connected to the support block 1802. Of course, seals are also required at this location. Specifically, a support block seal 1804 is provided between the support block 1802 and the guide seat 1801, and a cylinder radial seal 1805 and a cylinder end face seal 1806 are provided between the driving cylinder 1807 and the guide seat 1801. Again, the types of seals are not specifically limited here.

[0058] It should be noted that the above only exemplifies the double shield tunnel boring machine with earth pressure-TBM mode. In fact, for the double shield tunnel boring machine with mud-water-TBM mode, except for the slag (slurry) discharge method which is different from the above example, the other sealing structures can adopt the same sealing structure as the several sealing positions introduced above. In the mud-water mode, the functions of various sealing structures are the same and will not be explained in detail here.

[0059] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments without inventive effort, or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A double-shield tunnel boring machine, comprising a support shield, a gripper assembly mounted on the support shield, the gripper assembly comprising grippers and gripper cylinders, the support shield being provided with a gripper cavity, the front and rear side plates of the gripper cavity being provided with through-holes for the auxiliary thrust cylinder to pass through, wherein: It also includes a sealing ring plate for corresponding connection to the through-holes of the front and rear side plates, the sealing ring plate includes a side plate connecting portion for connection to the corresponding side plate and an insertion portion inserted into the corresponding through-hole. When the sealing ring plate is connected to the side plate, a sealing ring is provided between the side plate connecting portion and the corresponding side plate, and the end of the insertion portion is in close contact with the support shoe and a sealing ring is provided between the two; an end face sealing ring is provided at the edge of the inner support plate of the support shoe cavity, and the position where each support shoe cylinder passes through is located inside the end face sealing ring and / or a sealing ring is provided on the outer peripheral sleeve of the support shoe.

2. The double shield tunneling machine according to claim 1, characterized in that: The portion of the inner support plate located inside the end face sealing ring is provided with a plurality of bolt holes for tightening bolts to pass through, and the support shoe is provided with threaded holes at positions corresponding to the bolt holes. Under soil pressure or muddy water mode, the tightening bolts are installed through the bolt holes to fasten the support shoe and the inner support plate.

3. The double shield tunneling machine according to claim 2, characterized in that: The bolt holes are arranged in a vertical row and are respectively arranged at the front and rear ends of the middle position of the inner support plate.

4. The double shield tunneling machine according to any one of claims 1 to 3, characterized in that: The sealing ring sleeved on the outer periphery of the gripper shoe is an inflatable and deflable airbag sealing ring, and the air nozzle of the airbag sealing ring passes through the shoe plate of the gripper shoe and extends to the inside of the gripper shoe.

5. The double shield tunneling machine according to any one of claims 1 to 3, characterized in that: There are two end face sealing rings, the outer sealing ring is a steamed bun-shaped sealing ring or an O-shaped sealing ring, and the inner sealing ring is an inflatable and deflable airbag sealing ring. The air nozzle of the airbag sealing ring passes through the inner support plate and extends to the inside of the support shield.

6. The double shield tunneling machine according to claim 1, characterized in that: In the telescopic shield of the double-shield tunnel boring machine, a plurality of oil injection nozzles for connecting oil injection pipes to inject grease into the gap between the telescopic inner shield and the telescopic outer shield are installed on the telescopic inner shield.

7. The double shield tunneling machine according to claim 6, characterized in that: At least two annular radial seals are provided between the telescopic inner shield and the telescopic outer shield, and outlets of some oiling nozzles are located between the front and rear two radial seals.

8. The double shield tunneling machine according to claim 6 or 7, characterized in that: A slag-blocking ring and a finger-shaped sealing ring are installed at the rear end of the telescopic outer shield, and the finger-shaped sealing ring is located in front of the slag-blocking ring.

9. The double shield tunneling machine according to claim 7, characterized in that: The radial seal is a rubber seal with a set hardness.

10. The double shield tunneling machine according to any one of claims 1-3, 6, 7, and 9, characterized in that: In the telescopic shield of the double-shield tunnel boring machine, support blocks for abutting the inner wall of the telescopic outer shield to support the telescopic inner shield are installed between the telescopic inner shield and the telescopic outer shield at different circumferential positions.

11. The double shield tunneling machine according to claim 10, characterized in that: A guide seat is installed on the telescopic inner shield, and each support block is guided and installed in the guide seat, wherein the guide direction is the radial direction of the telescopic inner shield. A driving cylinder for driving the support block to move is also installed on the telescopic inner shield.

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