Double-shield tunneling machine

Abstract

The invention belongs to the technical field of tunneling equipment, and particularly provides a double-shield tunneling machine. The double-shield tunneling machine comprises a supporting shield, a supporting shoe assembly is installed on the supporting shield, the double-shield tunneling machine further comprises sealing ring plates used for being correspondingly connected to penetrating holes of a front side plate and a rear side plate, and each sealing ring plate comprises a side plate connecting part used for being connected with the corresponding side plate and a penetrating part inserted into the corresponding penetrating hole. A sealing ring is arranged between the side plate connecting part and the corresponding side plate; the end part of the insertion part is tightly attached to the gripper shoe; a sealing ring is arranged between the end part and the gripper shoe; an end face sealing ring is arranged on the edge of the inner supporting plate of the supporting shoe cavity, and the penetrating-out position of each supporting shoe oil cylinder is located in the end face sealing ring and / or the periphery of each supporting shoe is sleeved with a sealing ring. When the supporting shield is switched from a TBM mode to an earth pressure or muddy water mode, the sealing rings of all parts can achieve a better sealing effect, a large amount of slurry can be prevented from rushing into the space between the supporting shoe and the cavity wall of the supporting shoe cavity, and the sealing performance of the positions of the supporting shield and the supporting shoe is improved.

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] In response to the construction conditions of different strata, full-face tunnel boring machines of different models, such as earth pressure balance shield machine, slurry balance shield machine, open TBM, double shield TBM, etc., have been widely used in the construction of subway tunnels, highway tunnels, pumped storage power stations, mining tunnels and other projects, among which each model has its own applicable strata. However, in some construction projects, the entire construction area is often not a single stratum, for example, there are multiple strata alternating between hard rock and soft soil, which requires the tunnel boring machine to have different working modes.

[0003] The invention patent application with application publication number CN116378690A discloses a tunneling equipment based on a double shield TBM. Similar to the general double shield TBM, the tunneling equipment includes a telescopic outer shield, a telescopic inner shield, and a support shield (i.e., a tightening shield). The rear end of the telescopic outer shield and the front end of the telescopic inner shield are nested and slidably matched inside and outside. The rear end of the telescopic inner shield is connected to the support shield, and a tightening shoe device for tightening the tunnel wall is provided on the support shield. In the TBM mode, the working principle of the tunneling equipment is the same as that of the general double shield TBM. In order to achieve pressure-maintaining tunneling in the earth pressure mode and prevent mud from pouring into the interior of the tunneling equipment, the tunneling equipment is also provided with three sealing units, wherein the first sealing unit seals the tightening shoe cavity and the inner cavity of the tunneling equipment, the second sealing unit seals the radial gap between the telescopic inner shield and the telescopic outer shield, and the third sealing unit seals the gap between the telescopic inner shield and the support shield. In the earth pressure mode, each sealing unit exists at the same time, thereby ensuring the normal 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 holes for the thrust cylinder (auxiliary thrust cylinder) to pass through, which are 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, so as to prevent mud from flowing into the interior of the tunneling equipment through the through holes.

[0005] Regarding the sealing of the support shield and the support shoe cavity wall, the above patent application only considers how to prevent mud from pouring into the interior of the excavation equipment, and selects the location of each sealing ring according to this concept. However, in reality, mud will still enter the support shoe cavity from all sides through the gap between the support shoe cavity wall and the support shoe. Specifically, the mud mainly exists in the following two locations: First, although a sealing ring is provided at each movable hole, mud will still enter the gap between the inner support plate and the support shoe at the outer position of the movable hole sealing ring, and this part of the mud is difficult to discharge, and long-term excavation is prone to cause rust on the inner support plate; second, although a sealing ring is provided between the thrust cylinder and the support ring frame, the gap between the support shoe and the front and rear side plates will still be filled with mud, and the mud is often a mixture of slag, soil, and water. When the soil pressure mode ends and the TBM mode is ready to be switched, this can easily cause the support shoe to get stuck and unable to extend, resulting in mold change failure. In other words, there is still room for improvement in the sealing performance of the support shield and support shoe positions. 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 purpose, the technical solution of the double shield tunneling machine provided by the present invention is: 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 also comprises a sealing ring plate for corresponding connection to the through holes of the front and rear side plates, the sealing ring plate comprises a side plate connecting portion for connecting 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.

[0008] As a further improvement, the portion of the inner support plate located within 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 positions corresponding to the bolt holes. Under soil pressure or muddy water mode, the tensioning bolts are installed through the bolt holes to fasten the support shoe and the inner support plate together.

[0009] As a further improvement, 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.

[0010] As a further improvement, the sealing ring sleeved on the outer periphery of the support 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 support shoe and extends to the inside of the support shoe.

[0011] As a further improvement, two end face sealing rings are provided, wherein the sealing ring located on the outer side is a steamed bun-shaped sealing ring or an O-shaped sealing ring, and the sealing ring located on the inner side is an inflatable and deflable airbag sealing ring, the air nozzle of the airbag sealing ring extends through the inner support plate to the inner side of the support shield.

[0012] As a further improvement, 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.

[0013] 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 a part of the oiling nozzle is located between the front and rear two radial seals.

[0014] 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.

[0015] As a further improvement, the radial seal is a rubber seal with a set hardness.

[0016] As a further improvement, in the telescopic shield of the double-shield tunnel boring machine, support blocks for abutting against 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.

[0017] 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 guide and move is also installed on the telescopic inner shield.

[0018] The present invention belongs to 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 support shoe cavity wall, thereby avoiding excessive mud influx.

[0019] At the same time, in the scheme of setting 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 support shoe oil cylinder to pass through. Compared with the prior art that sets a seal for each movable hole separately, this can prevent mud from flowing into the space between the support shoe and the inner support plate, and also reduce the volume of the space corresponding to the gap between the support shoe and the wall of the support shoe cavity (that is, the space that mud can enter). In the scheme of setting a sealing ring on the periphery of the support shoe, the sealing ring on the periphery can directly seal the gap between the periphery of the support shoe and the wall of the support shoe cavity, 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 support shoe and the wall of the support shoe cavity (that is, the space that mud can enter). Of course, when the two schemes of the end face sealing ring and the sealing ring set on the periphery of the support shoe coexist, a better sealing effect can be achieved.

[0020] From the above analysis, it can be seen that when the support shield in the present invention switches from TBM mode to soil 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 support boot and the wall of the support boot cavity, thereby improving the sealing performance at the support shield and the support boot position. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of an embodiment of a double shield tunneling machine in the present invention in TBM mode; Figure 2 It is a schematic structural diagram of an embodiment of a double shield tunneling machine in the present invention under earth pressure mode; Figure 3 A cross-sectional view of a support shield in an embodiment of a double shield tunneling machine of the present invention; Figure 4 for Figure 3 A partial enlarged view of the middle A; Figure 5 for Figure 4 Partial schematic diagram of the sealing position of the middle support shoe and the support shield (the viewing angle is along the moving direction of the support shoe); Figure 6 for Figure 3 A partial enlarged view of point B in the middle; Figure 7 for Figure 6 A cross-sectional view of Figure 8 A partial cross-sectional view of the telescopic shield of the double-shield tunnel boring machine embodiment of the present invention (showing the articulated cylinder); Fig. 9 It is a partial cross-sectional view of the telescopic shield of the double shield tunneling machine embodiment of the present invention (hiding the articulated cylinder); Fig.10 A partial cross-sectional view of the telescopic shield of the double shield tunnel boring machine embodiment of the present invention (TBM mode); Fig.11It is a partial cross-sectional view of the telescopic shield of the double shield tunneling machine embodiment of the present invention (with support blocks); Fig.12 A cross-sectional view of a telescopic shield of an embodiment of a double-shield tunnel boring machine in the present invention (with support blocks); Fig.13 for Fig.12 A partial enlarged view of the position of the middle support block.

[0022] Description of reference numerals: 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. Oiling nozzle; 509. Slag retaining ring; 510. Finger seal ring; 6. Main push cylinder; 7. Torque arm; 8. Support shield; 9. Shoe assembly; 901. Shoe; 902. Shoe cylinder; 10. Auxiliary push cylinder; 11. Tail shield; 12. Segment assembly machine; 13. Center belt conveyor; 14. Slag discharge mechanism; 15. Hinge Connect to the oil cylinder; 1501, the first airbag sealing ring; 1502, the second airbag sealing ring; 1503, the steamed bun-shaped sealing ring; 1504, the bolt hole; 1601, the sealing ring plate; 1602, the ring plate connecting bolts; 1603, the second sealing ring; 1604, the third sealing ring; 17, the slag sliding mechanism; 1801, the guide seat; 1802, the support block; 1803, the support block connecting bolts; 1804, the support block seal; 1805, the oil cylinder radial seal; 1806, the oil cylinder end face seal; 1807, the driving oil cylinder; 1808, the oil cylinder connecting bolts. DETAILED DESCRIPTION

[0023] In order to improve the sealing performance of the support shield when the double shield tunneling machine works in the shield (earth pressure or mud water) mode, the basic technical concept of the present invention is to add a sealing ring plate at the auxiliary thrust cylinder perforation when switching the shield mode, and set a seal at the contact end between the sealing ring plate and the support shoe; set a larger sealing ring at a suitable position of the support shoe cavity so that the position of each support shoe cylinder passing through is located inside the sealing ring. The seals at various locations work together to reduce the volume of the gap or space between the support shoe and the support shield where mud may flow in, thereby avoiding a large amount of mud flowing in. The present invention is further described in detail below in conjunction with the embodiments and drawings.

[0024] The specific embodiment of the double shield tunneling machine provided by the present invention is as follows: 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 double shield tunnel boring machine is consistent with the existing double shield tunnel boring machine in that Figure 1 and Figure 2As shown, it includes a cutter head 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 cutter head 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 cutter head 1 can rotate and squeeze to break the rock. A torque arm 7 is connected between the front shield 3 and the support shield 8, and the torque arm 7 can be used to correct the front shield 3 in time after the rolling occurs. A segment assembler 12 is installed on the support shield 8, and the segment assembler 12 is consistent with the prior art. 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 prior art, 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, which can be seen in FIG. Figure 8-Figure 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 cylinder 15. A support shoe assembly 9 is installed on the support shield 8. Specifically, a support shoe cavity for accommodating the support shoe 901 is provided on the support shield 8. Consistent with the prior art, the support shoe cavity is formed by the side panels at various positions on the support shield 8, wherein the side panel for fitting with the end of the support shoe 901 away from the arc 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, as shown in FIG. Figure 3 As shown, the shoe assembly 9 includes a shoe 901 and a shoe cylinder 902. Under the pushing action of the shoe cylinder 902, the shoe 901 can extend outward from the shoe cavity to tighten the tunnel wall. Naturally, the inner support plate is provided with a hole through which the shoe cylinder 902 passes. In order to meet the installation requirements 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 shoe cavity and the corresponding positions of the 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 extension of the 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, so that the opening area is small while satisfying the normal operation of the support shoe 901.

[0025] TBM mode Figure 1 As shown, in this mode, the central belt conveyor 13 is used to discharge the slag. The slag plate on the back of the cutter head 1 can scoop up the slag in the soil bin and drop it onto the central belt conveyor 13 through the slag mechanism 17, and the central belt conveyor 13 continues to transport it backward. When advancing forward, the gripper 901 in the support shield 8 can be extended to hold the cave wall tightly. The telescopic inner shield 502 and the telescopic outer shield 501 in the telescopic shield 5 are not connected. The main push cylinder 6 is extended and retracted to push the front shield 3 and the telescopic outer shield 501 forward together, and the rear segment assembly machine 12 can assemble the segments synchronously. After advancing forward for a stroke, the gripper 901 is retracted, and the auxiliary push cylinder 10 is extended to push the segment to push the support shield 8 forward for a stroke.

[0026] Earth pressure mode Figure 2 As shown, in this mode, a slag discharge mechanism 14 (such as a screw conveyor) is used to discharge slag. To change the mode, the central belt conveyor 13 needs to be removed, and the passage on the front shield 3 for the front end of the central belt conveyor 13 to pass into the soil bin is closed. The slag discharge mechanism 14 is installed, and the slag in the soil bin is discharged backward through the slag discharge mechanism 14. In the soil pressure mode, the support shoe 901 in the support shield 8 is retracted and no longer extended, and as shown in FIG. Fig. 9 As shown, the telescopic inner shield 502 and the telescopic outer shield 501 are connected by telescopic shield connecting bolts 505, and the pipe segment is pushed forward by the auxiliary thrust cylinder 10 to achieve forward excavation. In the soil pressure mode, in order to form a stable soil plug effect and prevent mud from pouring into the excavation equipment, sealing units are also required at the corresponding positions, including the sealing of the support shield 8 and the support shoe 901, the sealing between the telescopic inner shield 502 and the telescopic outer shield 501, and the sealing between the telescopic inner shield 502 and the support shield 8. Fig. 9 and Fig.10 As shown, a first sealing ring 506 can be provided at the axial upper end positions of the telescopic inner shield 502 and the telescopic outer shield 501, and the specific type of the first sealing ring 506 is no longer limited and can be consistent with the prior art. The sealing between the telescopic inner shield 502 and the support shield 8 can adopt an articulated sealing ring 504 consistent with the prior art, and the type of the articulated sealing ring 504 is no longer specifically limited here.

[0027] 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 prior art. 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.

[0028] 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 plate positions of the support shoe cavity, the double shield tunneling machine is equipped with a sealing ring plate 1601. The sealing ring plate 1601 corresponds to the number of perforations and is connected to the corresponding front side plate or side plate. Specifically, the sealing ring plate 1601 includes a side plate connecting portion and an insertion portion. The side plate connecting portion is used to connect the corresponding side plate, and the insertion 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 tightly attached to 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 7Similarly, 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 sealing rings set at the positions, those skilled in the art are capable of selecting different sealing rings.

[0029] Analysis of the above structure shows that under the earth pressure mode, mud can easily flow from Figure 7 The gap between the side plate of the support shield 8 and the support shoe 901 shown enters the support 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 tunnel boring machine 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. Figure 3 and Figure 7 Each 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.

[0030] As an implementation method for conveniently disassembling and assembling 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 front half of the construction project is a hard rock formation and the back half is a soft soil formation with poor stability, the entire construction process only needs to change the mold once, that is, switch 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.

[0031] In addition, regarding the sealing of the movable hole for the support shoe oil cylinder 902 to pass through the support shield 8, 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 support shoe 901 and the inner support plate. In order to solve this problem, there are actually three feasible ways. As a first implementation method, Figure 4 and Figure 5For example, a larger end face sealing ring can be set at the edge of the inner support plate of the shoe cavity to ensure that all the positions where the shoe cylinders 902 pass through are located within the end face sealing ring. In this case, the end face sealing ring can actually block the mud from entering the shoe 901 and the inner support plate. Figure 4 For example, a sealing ring can be sleeved on the outer periphery of the support shoe 901, which can directly block the path of the mud entering the inner support plate. Accordingly, a ring groove for sleeved sealing ring needs to be provided 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 arranged at the inner support plate can coexist, which has a more reliable sealing effect.

[0032] 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 cavity and the support shoe 901, thereby ensuring that there will not be too much mud pouring in when excavating in the earth pressure mode.

[0033] 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, a 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 there is no need to seal in the TBM mode at a 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 support shoe 901, namely the first airbag sealing ring 1501, is located at one end of the support shoe 901 close to the inner support plate, so as to avoid the first airbag sealing ring 1501 interfering with the auxiliary thrust cylinder 10.

[0034] As another preferred embodiment, Figure 4As shown, there are two end face sealing rings, of which the sealing ring located on the inner side is an inflatable and deflable airbag sealing ring, namely the second airbag sealing ring 1502, and the sealing ring located on the outer side 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 to the inside of the support shield 8. Here, the two end face sealing rings cooperate with each other, and the steamed bun-shaped sealing ring 1503 is located 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 can be reliably sealed. In other embodiments, the steamed bun-shaped sealing ring 1503 can be replaced by 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.

[0035] As a more reliable sealing method, Figure 5 As shown, the inner support plate is provided with a plurality of bolt holes 1504 for tightening bolts to pass through, and the bolt holes 1504 are located inside the end face sealing ring. The gripper shoe 901 is provided with threaded holes at positions corresponding to the bolt holes 1504. In the soil pressure mode, after the gripper shoe 901 is retracted, the tightening bolts can be passed through the bolt holes 1504 and connected to the threaded holes, thereby fastening the gripper shoe 901 and the support plate. Since the whole machine vibrates strongly during the excavation process, this can prevent the gripper shoe 901 from shaking inside the gripper shoe cavity, ensuring that the end face sealing ring is compressed, and also preventing the end face sealing ring from being tilted and failing due to the vibration of the gripper shoe 901.

[0036] In a further optimized embodiment, Figure 5 As shown, the bolt holes 1504 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. The middle position is far away from the support shoe cylinder 902, and the tightness of the end face sealing ring of this part is relatively weak. The arrangement of the bolt holes 1504 can specifically strengthen the sealing effect of this position.

[0037] The following focuses on the seal between the telescopic inner shield 502 and the telescopic outer shield 501 in the telescopic shield 5. Fig. 9 and Fig.10 As shown, a plurality of oiling nozzles 508 are installed on the telescopic inner shield 502. In the soil pressure mode, the oiling nozzles 508 can be connected to the oiling pipe to inject grease into the gap between the telescopic inner shield 502 and the telescopic outer shield 501, that is, the grease chamber 507. At this time, a positive pressure seal is formed to flush out the mud that enters. Specifically, the oiling nozzles 508 can be evenly distributed along the circumference of the telescopic inner shield 502, and the specific number is not limited.

[0038] In addition to the above-mentioned provision of the oil injection nozzle 508 to achieve positive pressure sealing, in a preferred embodiment, as Figure 8-Figure 10As shown, two annular radial seals 503 arranged front and back (axially) are provided between the telescopic inner shield 502 and the telescopic outer shield 501, and the outlet of a part of the oil injection nozzle 508 is located between the front and rear radial seals 503. At this time, the telescopic inner shield 502, the telescopic outer shield 501, and the front and rear radial seals 503 enclose a substantially closed inner cavity, and the grease in the inner cavity can build up a certain pressure, thereby forming a grease seal with a certain length in the axial direction.

[0039] As for the radial seal 503, a rubber seal with a set hardness is preferably used, which can be installed on the telescopic inner shield 502 or the telescopic outer shield 501. The radial seal 503 cannot be removed, so the hardness of the rubber seal cannot be too low, otherwise it is easy to be worn and fail in the TBM mode. Compared with the rigid seal (steel ring), the use of a rubber seal with a set hardness can play a basic supporting role on the one hand, and at the same time, when the main push cylinder 6 works to turn and adjust the direction, it will not cause the telescopic inner shield 502 and the telescopic outer shield 501 to be completely immobile.

[0040] In a further preferred embodiment, Fig. 9 and Fig.10 As 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 the finger-shaped sealing ring 510 can play a preliminary role in blocking mud, which further improves the sealing performance between the telescopic inner shield 502 and the telescopic outer shield 501.

[0041] Considering that there are complex strata with alternating soft soil and hard rock in actual construction projects, in the TBM mode, the telescopic inner shield 502 and the telescopic outer shield 501 slide against each other, which may 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 may not be aligned with each other. At this time, when switching the earth pressure mode, the telescopic shield connecting bolt 505 may not be installed. To solve this problem, as a preferred embodiment, Figure 11-13 As shown, support blocks 1802 are installed between the telescopic inner shield 502 and the telescopic outer shield 501 at different positions in the circumferential direction, and the support blocks 1802 are used to abut against 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 the telescopic inner shield 502 or the telescopic outer shield 501, and are preferably evenly distributed in the circumferential direction. In the case where the support blocks 1802 are provided, the support blocks 1802 can play a certain supporting role, thereby avoiding the problem of large eccentricity and non-coaxiality between the telescopic inner shield 502 and the telescopic outer shield 501, and ensuring the normal installation of the telescopic shield connecting bolts 505.

[0042] 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 by 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, Fig.13 For example, the guide seat 1801 can be welded on the telescopic inner shield 502, the driving cylinder 1807 can be installed on the guide seat 1801 through the cylinder connecting bolt 1808, and the piston rod of the driving cylinder 1807 is connected to the support block 1802. Of course, a seal is also required at this position. 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. Similarly, the type of seal is not specifically limited here.

[0043] It should be noted that the above only exemplifies a double shield tunnel boring machine with earth pressure-TBM mode. In fact, for a double shield tunnel boring machine with mud-water-TBM mode, except that the slag (slurry) discharge method is different from the above example, 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 elaborated here.

[0044] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A double shield tunneling machine, comprising a support shield, a gripper shoe assembly is mounted on the support shield, the gripper shoe assembly comprises a gripper shoe and a gripper shoe cylinder, the support shield is provided with a gripper shoe cavity, the front and rear side plates of the gripper shoe cavity are 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 connecting 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, 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.

2. The double shield tunneling machine according to claim 1, characterized in that: The portion of the inner support plate located within 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 positions corresponding to the bolt holes. Under soil pressure or muddy water mode, the tensioning bolts are installed through the bolt holes to fasten the support shoe and the inner support plate together.

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 support 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 support shoe and extends to the inside of the support 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 which extends through the inner support plate 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 tunneling 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 arranged between the telescopic inner shield and the telescopic outer shield, and outlets of some oil injection 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 against 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 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.

Images