Shield body bracing device for shield tunneling machine and shield tunneling machine

Abstract

The present application provides a shield body bracing device for a shield tunneling machine and the shield tunneling machine, and solves the problem that the existing bracing device on the shield body cannot truly and fully reflect the contact tightness between the bracing device and the inner wall of the tunnel, which is not conducive to the accurate control of the extrusion degree between the shield body and the inner wall of the tunnel by the control system of the shield tunneling machine. The present application can realize real-time sensing of the extrusion degree of the bracing plate on the inner wall of the tunnel through the pressure sensor, truly and fully reflects the contact tightness between the bracing device and the inner wall of the tunnel, and is more conducive to the accurate control of the extrusion degree between the shield body and the inner wall of the tunnel by the control system of the shield tunneling machine. When there is a recessed area at a certain position of the inner wall of the tunnel, and the pressure signal fed back by the pressure sensor does not reach the set pressure value, the control system of the shield tunneling machine can also control the hydraulic cylinder to continue to extend outward until the pressure signal fed back by the pressure sensor reaches the set pressure value.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of tunnel construction equipment, in particular to a shield body bracing device for a shield tunneling machine and the shield tunneling machine. BACKGROUND

[0002] At present, shield tunneling machines are mainly used for underground tunnel construction, and the shield tunneling machine moves forward by cutting the earth with a cutter head. During the cutting process, the cutter head is subjected to a reverse torque from the soil, which is transmitted to the shield body through the cutter head support leg and the main drive, causing the shield body to bear a certain overturning force. Under normal circumstances, the resistance of the tunnel wall and the internal resistance of the shield body can prevent the shield body from overturning, but when complex strata are encountered, the cutter head penetration is large, especially at the moment of cutter head start-up, the torque on the cutter head is large, and the shield body will bear a large overturning force. If the tunnel wall and the shield body cannot be in good contact, the frictional resistance generated will be small, which will easily cause the shield body to twist, affect the use posture of the equipment, cause construction deviation, and at the same time, there is a serious safety hazard.

[0003] In order to solve the above problems, the patent document with application number 2020111883723 discloses a shield tunneling machine and a shield body bracing device for the shield tunneling machine. The device fills the gap between the shield body and the tunnel wall by embedding a telescopic bracing device on the outer peripheral surface of the shield body, so that the shield body can be in full contact with the inner wall of the tunnel, preventing the shield body from twisting. However, the device has the following disadvantages when in use: (1) The telescopic amount of the bracing device on the shield body is controlled by a stroke sensor, which cannot truly and fully reflect the contact tightness between the bracing device and the inner wall of the tunnel, which is not conducive to the accurate control of the extrusion degree between the shield body and the inner wall of the tunnel by the control system of the shield tunneling machine. For example, if there is a recessed area on the inner wall of the tunnel, the bracing device cannot achieve the purpose of bracing between the shield body and the inner wall of the tunnel; (2) The bracing shoe and the hinge plate are connected in a plug-in connection relationship, and when the shield tunneling machine is working, the mud outside is easy to seep into the bracing device from the gap between the bracing shoe and the hinge plate. The bracing device only relies on the sewage ball valve installed on the base to discharge the mud, which obviously has the problem of difficult complete discharge of the mud. SUMMARY

[0004] In order to solve the problem of the existing bracing device on the shield body that cannot truly and fully reflect the contact tightness between the bracing device and the inner wall of the tunnel, which is not conducive to the accurate control of the extrusion degree between the shield body and the inner wall of the tunnel by the control system of the shield tunneling machine, the present application provides a shield body bracing device for a shield tunneling machine and the shield tunneling machine.

[0005] The technical scheme of the present application is: a shield body bracing device for a shield tunneling machine, comprising a plurality of bracing devices arranged in a ring shape and spaced apart along the circumferential side of the shield body, and an annular recess recessed inwardly is arranged on the outer wall of the shield body, and the annular recess and the shield body are arranged on the same central axis.

[0006] The bracing device comprises a hydraulic cylinder, one end of the hydraulic cylinder is fixedly connected with the groove bottom of the annular groove, the other end of the hydraulic cylinder is fixedly connected with one side of the pressure sensor, the other side of the pressure sensor away from the hydraulic cylinder is fixedly connected with the inner side of the bracing plate, the bracing plate is an arc-shaped plate structure, the left and right widths of the bracing plate are equal to the left and right groove widths of the annular groove;

[0007] When the hydraulic cylinder is in the initial state, the bracing plates can be spliced into an annular plate, the outer side of the annular plate is flush with the left and right outer walls of the shield body;

[0008] The inner side of the bracing plate is fixedly provided with two sharp corners extending in the front-rear direction and being arc-shaped, the vertical section of the sharp corner is a right angle structure, the side of the sharp corner facing the side wall of the annular groove is a right angle side, and the side of the sharp corner facing the side wall of the annular groove is in sliding fit with the side wall of the annular groove;

[0009] The left and right side walls of the annular groove are fixedly provided with annular mud guards, and the annular mud guards are arranged on the same central axis as the shield body;

[0010] The annular mud guard comprises an inclined plate segment, one end of the inclined plate segment is fixedly connected with the side wall of the annular groove, the inclined plate segment is located directly below the sharp corner, and the inclined plate segment is parallel to the inclined surface of the sharp corner;

[0011] The inclined plate segment and the side wall of the annular groove form an annular mud storage cavity;

[0012] When the hydraulic cylinder is in the initial state, the sharp corner is immersed in the mud storage cavity, the lower end of the sharp corner abuts at the connecting angle between the inclined plate segment and the annular groove, and the inclined surface of the sharp corner is in fit with the inclined plate segment.

[0013] Preferably, the annular mud guard further comprises a rim plate segment, the rim plate segment is fixedly connected with one end of the inclined plate segment, and the rim plate segment is parallel to the bracing plate;

[0014] When the hydraulic cylinder is in the initial state, the rim plate segment is in fit with the bracing plate.

[0015] Preferably, a cleaning water pipe is arranged in the shield body, one end of the cleaning water pipe is connected with a water supply system of the shield tunneling machine, a first electromagnetic valve is arranged on the cleaning water pipe, the other end of the cleaning water pipe penetrates through the annular groove and is embedded on the inclined plate segment, and the cleaning water pipe is in communication with the mud storage cavity;

[0016] The communication node of the cleaning water pipe and the mud storage cavity is located at the upper part of the shield body, so that the water flow injected into the mud storage cavity by the cleaning water pipe can flow to the front and rear sides of the annular mud guard.

[0017] Preferably, the shield body is provided with a low-pressure air pipe, one end of the low-pressure air pipe is connected with a low-pressure air supply system, the low-pressure air supply system is located in the interior of the shield body, a second electromagnetic valve is arranged on the low-pressure air pipe, the other end of the low-pressure air pipe is embedded in the side wall of the annular groove, and the low-pressure air pipe is communicated with the mud storage cavity.

[0018] The communication node of the low-pressure air pipe and the mud storage cavity is located at the upper part of the shield body, so that the airflow ejected by the low-pressure air pipe can push the sewage remaining in the upper part of the mud storage cavity to the front and rear sides of the annular mud guard.

[0019] Preferably, the cleaning water pipe comprises a main pipe and a plurality of branch pipes, one end of the main pipe is connected with a water supply system of the shield tunneling machine, the other end of the main pipe is connected with the plurality of branch pipes at the same time, and the other ends of the branch pipes on the same main pipe are embedded in the inclined plate section in a ring shape and at equal distances.

[0020] Preferably, an annular track is fixedly arranged on the groove bottom of the annular groove, a plurality of sliding blocks are slidably arranged on the annular track, one side of the sliding blocks away from the annular track is fixedly connected with a mounting plate, the mounting plate is an annular plate structure arranged around the groove bottom of the annular groove, one end of the hydraulic cylinder, which faces the groove bottom of the annular groove, is fixedly connected with the mounting plate.

[0021] One side of the mounting plate away from the annular track is fixedly provided with an annular rack, a driving motor is fixedly arranged in the shield body, an output shaft of the driving motor penetrates through the side wall of the annular groove, an annular gear is fixedly arranged on the output shaft of the driving motor, and the annular gear is meshed with the annular rack.

[0022] Preferably, the left and right sides of the hydraulic cylinder are both provided with movable rods, one end of each movable rod is fixedly connected with the support plate in a perpendicular manner, and the other end of each movable rod is movably inserted into a sleeve, one end of the sleeve is fixedly connected with the mounting plate.

[0023] When the hydraulic cylinder is in an initial state, the end of the movable rod away from the support plate abuts against the mounting plate.

[0024] Preferably, a protective sleeve is fixedly arranged on the inner side of the support plate in a perpendicular manner, the other end of the protective sleeve movably sleeves the piston rod of the hydraulic cylinder, and a pressure sensor is located in the protective sleeve.

[0025] A shield tunneling machine comprises the shield body and the tensioning mechanism as claimed in any one of claims 1, 2, 3, 5, 6, 7 or 8.

[0026] Advantages of the present invention: (1) The present invention can sense the degree of compression of the support plate on the inner wall of the tunnel in real time through the pressure sensor, and truly and fully reflect the tightness of the contact between the support device and the inner wall of the tunnel, which is more conducive to the control system of the tunnel boring machine to accurately control the degree of compression between the shield and the inner wall of the tunnel. If there is a recessed area in a certain place on the inner wall of the tunnel, and the pressure signal fed back by the pressure sensor does not reach the set pressure value, the control system of the tunnel boring machine can also control the hydraulic cylinder to continue to extend outward until the pressure signal fed back by the pressure sensor reaches the set pressure value.

[0027] (2) The purpose of setting the sharp corner is to increase the contact length between the side of the support plate and the side wall of the annular groove when the support plate moves outward under the push of the hydraulic cylinder, so as to avoid the formation of a large gap between the support plate and the side wall of the annular groove, which would cause mud and water to seep in too quickly and too much. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the main structure of Example 1 (the middle part of the shield body is omitted).

[0030] Figure 2 for Figure 1 A schematic diagram of the support plate mechanism from the right view angle;

[0031] Figure 3 for Figure 1 A structural diagram of the upper half of the shield body and support plate structure in the diagram;

[0032] Figure 4 for Figure 3 Enlarged view of the structure at point A in the image;

[0033] In the diagram, 1. Shield body, 2. Annular groove, 3. Annular track, 4. Slider, 5. Mounting plate, 6. Hydraulic cylinder, 7. Pressure sensor, 8. Support plate, 801. Sharp corner, 9. Protective sleeve, 10. Annular mudguard, 1001. Inclined plate section, 1002. Edge plate section, 11. Mud storage chamber, 12. Cleaning water pipe, 13. First solenoid valve, 14. Low-pressure air pipe, 15. Second solenoid valve, 16. Sleeve, 17. Movable rod, 18. Annular rack, 19. Drive motor, 20. Drive gear. Detailed Implementation

[0034] With reference to the accompanying drawings: the technical solutions in the embodiments of the present application will be apparently and completely described, obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor belong to the scope of protection of the present application.

[0035] Embodiment 1: A shield machine, as shown in Figure 1 and Figure 2 , comprising a plurality of bracing devices arranged along the circumferential side of the shield body 1, the outer wall of the shield body 1 is provided with an annular groove 2 recessed inward, and the annular groove 2 is arranged on the same central axis as the shield body 1.

[0036] The bottom of the annular groove 2 is fixedly provided with an annular track 3, a plurality of sliding blocks 4 are slidably arranged on the annular track 3, the side of the sliding block 4 away from the annular track 3 is fixedly connected with a mounting plate 5, the mounting plate 5 is an annular plate structure arranged around the bottom of the annular groove 2, and the side of the mounting plate 5 away from the annular track 3 is fixedly provided with an annular rack 18, a driving motor 19 is fixedly arranged in the shield body 1, the output shaft of the driving motor 19 penetrates through the side wall of the annular groove 2, and a driving gear 20 is fixedly arranged on the output shaft of the driving motor 19 and meshes with the annular rack 18.

[0037] The bracing device on the shield body 1 comprises a hydraulic cylinder 6, one end of the hydraulic cylinder 6 is fixedly connected with the mounting plate 5, the other end of the hydraulic cylinder 6 is fixedly connected with one side of a pressure sensor 7, the other side of the pressure sensor 7 away from the hydraulic cylinder 6 is fixedly connected with the inner side of a bracing plate 8, the bracing plate 8 is an arc-shaped plate structure, and the left and right widths of the bracing plate 8 are equal to the left and right groove widths of the annular groove 2, so as to reduce the amount of mud seeping into the annular groove 2 through the gap between the bracing plate 8 and the side wall of the annular groove 2 as much as possible.

[0038] When the hydraulic cylinder 6 is in the initial state, the bracing plates 8 can be spliced into an annular plate, and the outer side of the annular plate is flush with the left and right outer walls of the shield body 1.

[0039] The pressure sensor 7 can realize real-time sensing of the extrusion degree of the bracing plate 8 on the inner wall of the tunnel, and truly and fully reflect the contact tightness between the bracing device and the inner wall of the tunnel, which is more conducive to the accurate control of the extrusion degree between the shield body and the inner wall of the tunnel by the control system of the shield machine. When there is a recessed area on the inner wall of the tunnel, and the pressure signal fed back by the pressure sensor 7 does not reach the set pressure value, the control system of the shield machine can also control the hydraulic cylinder 6 to continue to extend outward until the pressure signal fed back by the pressure sensor 7 reaches the set pressure value. (Note that the hydraulic cylinder 6 corresponding to the pressure sensor 7 affected by the gravity of the bracing plate 8, such as the bracing plate 8 on the top of the shield body 1, needs to add a self-weight variable of the bracing plate 8)

[0040] The left and right ends of the inner side of the support plate 8 are fixedly provided with arc-shaped sharp corners 801 extending in the front-rear direction, and the vertical section of the sharp corner 801 is a right angle structure, and the side of the sharp corner 801 facing the side wall of the annular groove 2 is a right angle side, and the side of the sharp corner 801 facing the side wall of the annular groove 2 is in sliding fit with the side wall of the annular groove 2.

[0041] In order to collect the mud and water that seeps into the annular groove 2 through the gap between the support plate 8 and the side wall of the annular groove 2, it is convenient for subsequent cleaning, such as Figure 1 and Figure 3 As shown in the drawings, the left and right side walls of the annular groove 2 are each fixedly provided with an annular mud guard 10, and the annular mud guard 10 is arranged on the same central axis as the shield body 1.

[0042] The annular mud guard 10 includes a slope segment 1001, one end of the slope segment 1001 is fixedly connected with the side wall of the annular groove 2, the slope segment 1001 is located directly below the sharp corner 801, and the slope segment 1001 is parallel to the slope surface of the sharp corner 801.

[0043] The slope segment 1001 and the side wall of the annular groove 2 form an annular mud storage cavity 11, the mud and water that seeps into the annular groove 2 is collected in the mud storage cavity 11, and when the amount of mud and water in the upper part of the mud storage cavity 11 is relatively large, the mud and water can also automatically flow along the annular mud guard 10 to the front and rear sides of the shield body 1, and finally fall to the ground, so that the mud and water storage capacity in the mud storage cavity 11 can be kept in dynamic balance, and will not overflow into the annular groove 2.

[0044] The slope segment 1001 also has the purpose of limiting the movement stroke of the support plate 8, and limiting the initial position of the support plate 8.

[0045] When the hydraulic cylinder 6 is in the initial state, the sharp corner 801 is immersed in the mud storage cavity 11, and the lower end of the sharp corner 801 abuts at the connecting angle between the slope segment 1001 and the annular groove 2, and the slope surface of the sharp corner 801 and the slope segment 1001 are in close contact with each other.

[0046] The purpose of the sharp corner 801 is to increase the contact length between the side surface of the support plate 8 and the side wall of the annular groove 2 when the support plate 8 is moved outward under the push of the hydraulic cylinder 6, to avoid a large gap directly formed between the support plate 8 and the side wall of the annular groove 2, and the mud and water seeps too fast and too much. Second, when cleaning the mud and water in the mud storage cavity 11, the sharp corner 801 can push the residual sewage in the mud storage cavity 11 to the ground below when it moves circularly in the mud storage cavity 11 under the drive of the drive motor 19.

[0047] In order to increase the contact area of the annular mud guard 10 to the support plate 8, as shown in the drawings, Figure 3 and Figure 4As shown in the figure, the annular mudguard 10 also comprises a rim plate segment 1002, which is fixedly connected with one end of the inclined plate segment 1001, and is parallel to the support plate 8; when the hydraulic cylinder 6 is in the initial state, the rim plate segment 1002 is in close contact with the support plate 8.

[0048] As shown in the figure, Figure 1 , Figure 3 and Figure 4 , the shield body 1 is provided with a cleaning water pipe 12, one end of which is connected with the water supply system of the shield tunneling machine, the cleaning water pipe 12 is provided with a first electromagnetic valve 13, and the other end of the cleaning water pipe 12 penetrates through the annular groove 2 and is embedded on the inclined plate segment 1001, and the cleaning water pipe 12 is in communication with the mud storage cavity 11. The communication node of the cleaning water pipe 12 and the mud storage cavity 11 is located at the upper part of the shield body 1, so that the water flow injected into the mud storage cavity 11 by the cleaning water pipe 12 can flow to the front and rear sides of the annular mudguard 10.

[0049] When the mud water infiltrated into the mud storage cavity 11 is relatively thick and not easy to flow downward, clean water can be injected into the mud storage cavity 11 through the cleaning water pipe 12 to reduce the thickness of the mud water and flush the mud storage cavity 11, and at this time, the mud in the part not easy to flush is pushed to the part easy to flush by rotating the sharp corner 801, so that the cleaning effect is more thorough.

[0050] The shield body 1 is provided with a low-pressure air pipe 14, one end of which is connected with a low-pressure air supply system, the low-pressure air supply system is located in the interior of the shield body 1, the low-pressure air pipe 14 is provided with a second electromagnetic valve 15, and the other end of the low-pressure air pipe 14 is embedded on the side wall of the annular groove 2, and the low-pressure air pipe 14 is in communication with the mud storage cavity 11.

[0051] The communication node of the low-pressure air pipe 14 and the mud storage cavity 11 is located at the upper part of the shield body 1, so that the airflow ejected by the low-pressure air pipe 14 can push the sewage remaining at the upper part of the mud storage cavity 11 to the front and rear sides of the annular mudguard 10, so as to ensure that there is no water remaining in the mud storage cavity 11 after cleaning, and avoid the corrosion of the water to the shield body.

[0052] In order to improve the anti-twisting and anti-shearing ability of the connecting part of the pressure sensor 7 and the support plate 8, as shown in the figure, Figure 1 and Figure 3 , the left and right sides of the hydraulic cylinder 6 are both provided with a movable rod 17, one end of which is fixedly connected with the support plate 8 perpendicularly, and the other end of the movable rod 17 is movably inserted into the sleeve pipe 16, one end of the sleeve pipe 16 is fixedly connected with the mounting plate 5.

[0053] When the hydraulic cylinder 6 is in the initial state, the end of the movable rod 17 away from the support plate 8 abuts against the mounting plate 5, at this time, the movable rod 17 can also support the support plate 8, so as to reduce the pressure intensity of the annular mudguard 10 and the pressure sensor 7, and facilitate the zero setting of the pressure sensor 7.

[0054] The inner side of the support plate 8 is vertically fixed with a protective sleeve 9, the other end of the protective sleeve 9 movably sleeved on the piston rod of the hydraulic cylinder 6, and the pressure sensor 7 is located in the protective sleeve 9.

[0055] The mud accidentally seeped into the bottom of the annular groove 2 can also be washed by increasing the water pressure in the cleaning water pipe 12, so that the water flows into the annular groove 2 along the annular mudguard 10, and the mud at the bottom of the annular groove 2 is washed, and the washed mud is discharged from the bottom of the shield body 1.

[0056] Embodiment 2: A shield tunneling machine, different from the embodiment 1, the cleaning water pipe 12 comprises a main pipe and a plurality of branch pipes, one end of the main pipe is connected with the water supply system of the shield tunneling machine, the other end of the main pipe is connected with the plurality of branch pipes, and the other ends of the branch pipes on the same main pipe are embedded on the inclined plate segment 1001 in a ring shape at equal intervals. The other structures are the same as those of the embodiment 1.

[0057] Embodiment 3: A shield tunneling machine, different from the embodiment 1, the mounting plate 5, the annular track 3, the sliding block 4, the annular rack 18, the driving motor 19 and the driving gear 20 are not arranged in the embodiment, and the hydraulic cylinder 6 and the sleeve 16 are fixedly arranged on the bottom of the annular groove 2. The other structures are the same as those of the embodiment 1.

[0058] It is apparent for those skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all aspects as illustrative and not restrictive, the scope of the present application being defined by the appended claims rather than the above description, and all changes coming within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

Claims

1. A shield jacking device for a tunneling machine, characterized in that: The supporting device comprises a hydraulic cylinder (6), one end of the hydraulic cylinder (6) is fixedly connected with the groove bottom of the annular groove (2), the other end of the hydraulic cylinder (6) is fixedly connected with one side of the pressure sensor (7), the other side of the pressure sensor (7) away from the hydraulic cylinder (6) is fixedly connected with the inner side of the supporting plate (8), the supporting plate (8) is an arc plate structure, the left and right widths of the supporting plate (8) are equal to the left and right groove widths of the annular groove (2); When the hydraulic cylinder (6) is in the initial state, the supporting plates (8) can be spliced into an annular plate, the outer side of the annular plate is flush with the left and right outer walls of the shield body (1); The left and right ends of the inner side of the supporting plate (8) are fixedly provided with sharp corners (801) extending in the front-rear direction and in an arc shape, the vertical section of the sharp corner (801) is a right angle structure, one side of the sharp corner (801) facing the side wall of the annular groove (2) is a right angle side, and the side of the sharp corner (801) facing the side wall of the annular groove (2) is in sliding fit with the side wall of the annular groove (2); The left and right side walls of the annular groove (2) are fixedly provided with annular mud guards (10), and the annular mud guards (10) are coaxially arranged with the shield body (1); The annular mud guard (10) comprises an inclined plate section (1001), one end of the inclined plate section (1001) is fixedly connected with the side wall of the annular groove (2), the inclined plate section (1001) is located directly below the sharp corner (801), and the inclined plate section (1001) is parallel to the inclined surface of the sharp corner (801); The inclined plate section (1001) and the side wall of the annular groove (2) form an annular mud storage cavity (11); When the hydraulic cylinder (6) is in the initial state, the sharp corner (801) is immersed in the mud storage cavity (11), and the lower end of the sharp corner (801) abuts against the connecting angle between the inclined plate section (1001) and the annular groove (2), and the inclined surface of the sharp corner (801) is in fit with the inclined plate section (1001). The annular mud guard (10) further comprises a rim plate section (1002), the rim plate section (1002) is fixedly connected with one end of the inclined plate section (1001), and the rim plate section (1002) is parallel to the supporting plate (8); 2. The shield supporting device for a shield tunneling machine according to claim 1, characterized in that: When the hydraulic cylinder (6) is in the initial state, the rim plate section (1002) is in fit with the supporting plate (8). The shield body (1) is provided with a cleaning water pipe (12), one end of the cleaning water pipe (12) is connected with a water supply system of a shield tunneling machine, the cleaning water pipe (12) is provided with a first electromagnetic valve (13), the other end of the cleaning water pipe (12) penetrates through the annular groove (2) and is embedded on the inclined plate section (1001), and the cleaning water pipe (12) is in communication with the mud storage cavity (11); 3. The shield supporting device for a shield tunneling machine according to claim 2, characterized in that: The communication node of the cleaning water pipe (12) and the mud storage cavity (11) is located at the upper part of the shield body (1), so that the water flow injected into the mud storage cavity (11) by the cleaning water pipe (12) can flow to the front and rear sides of the annular mud guard (10) along the annular mud guard (10). ​ 4. The shield supporting device for a shield tunneling machine according to claim 3, characterized in that: The shield body (1) is internally provided with a low-pressure air pipe (14), one end of the low-pressure air pipe (14) is connected with a low-pressure air supply system, the low-pressure air supply system is located inside the shield body (1), the low-pressure air pipe (14) is provided with a second electromagnetic valve (15), the other end of the low-pressure air pipe (14) is embedded on the side wall of the annular groove (2), and the low-pressure air pipe (14) is in communication with the mud storage cavity (11); The communication node of the low-pressure air pipe (14) and the mud storage cavity (11) is located at the upper part of the shield body (1), so that the airflow sprayed by the low-pressure air pipe (14) can push the sewage remaining on the upper part of the mud storage cavity (11) to the front and rear sides of the annular mud guard (10).

5. The shield supporting device for a shield tunneling machine according to claim 3, wherein: The cleaning water pipe (12) comprises a main pipe and a plurality of branch pipes, one end of the main pipe is connected with a water supply system of the shield tunneling machine, the other end of the main pipe is connected with the plurality of branch pipes at the same time, and the other ends of the branch pipes on the same main pipe are embedded on the inclined plate section (1001) at equal intervals in a ring shape.

6. The shield supporting device for a shield tunneling machine according to claim 3, wherein: The bottom of the annular groove (2) is fixedly provided with an annular track (3), a plurality of sliding blocks (4) are slidably arranged on the annular track (3), one side of the sliding blocks (4) away from the annular track (3) is fixedly connected with a mounting plate (5), the mounting plate (5) is an annular plate structure arranged around the bottom of the annular groove (2), one end of a hydraulic cylinder (6) facing the bottom of the annular groove (2) is fixedly connected with the mounting plate (5); One side of the mounting plate (5) away from the annular track (3) is fixedly provided with an annular rack (18), a driving motor (19) is fixedly arranged in the shield body (1), an output shaft of the driving motor (19) penetrates through the side wall of the annular groove (2) and is rotatable, the output shaft of the driving motor (19) is fixedly provided with a driving gear (20), and the driving gear (20) is in meshing connection with the annular rack (18).

7. The shield supporting device for a shield tunneling machine according to claim 6, wherein: The left and right sides of the hydraulic cylinder (6) are both provided with movable rods (17), one end of each movable rod (17) is fixedly connected with a supporting plate (8) perpendicularly, and the other end of each movable rod (17) is movably inserted into a sleeve pipe (16), one end of the sleeve pipe (16) is fixedly connected with the mounting plate (5); When the hydraulic cylinder (6) is in an initial state, the end of the movable rod (17) away from the supporting plate (8) abuts against the mounting plate (5).

8. The shield supporting device for a shield tunneling machine according to claim 1 or 2 or 4 or 5 or 6 or 7, characterized in that: The inner side of the supporting plate (8) is fixedly provided with a protection sleeve pipe (9) perpendicularly, the other end of the protection sleeve pipe (9) is movably sleeved on the piston rod of the hydraulic cylinder (6), and a pressure sensor (7) is located in the protection sleeve pipe (9).

9. A tunneling machine characterized by: The shield body (1) and the tensioning mechanism are as claimed in any one of claims 1, 2, 4, 5, 6 or 7.

Images