Method for replacing main bearing of double-track linkage TBM (tunnel boring machine) of long-distance double-hole tunnel

Abstract

The invention provides a long-distance double-hole tunnel double-line linkage TBM main bearing replacement method, and belongs to the technical field of tunnel construction.The method comprises the steps that after a left line continues to conduct tunneling and exceeds the position of a right line cutterhead in a matched mode, a transverse channel is excavated between the left line and the right line to serve as a main bearing conveying channel; synchronously fixing a right line cutter head, separating the cutter head, retreating a main machine, disassembling internal and external seals of a main drive and disassembling a slag collecting hopper; according to the method, the TBM main bearing is replaced in a double-hole tunnel double-line linkage mode, and compared with maintenance modes of parallel pilot tunnels, inclined shafts and the like, the main bearing replacement mode is lower in cost, the replacement period is relatively shorter, and the influence on the other line is relatively lower.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel construction, and in particular to a method for replacing a main bearing of a long-distance double-hole tunnel double-line linkage TBM. Background Art

[0002] In long-distance tunnel construction, due to the long tunnel distance, the service life and life of the TBM main bearing are exceeded, or due to the complex geological conditions, the TBM main bearing may need emergency repair or replacement due to wear, damage and other reasons during the excavation process. The difficulty of repair and replacement lies in the following: first, the TBM main bearing is large in size and indivisible, which makes it difficult to transport; second, the main bearing installation location and installation method are special and difficult to remove; third, the tunnel space is small, and the replacement and maintenance work requires a large space. The existing parallel guide hole, inclined shaft or vertical shaft maintenance and replacement methods have problems such as high cost, low efficiency, high difficulty, and poor adaptability, which affect the construction progress and safety.

[0003] Taking the method of excavating parallel guide tunnels to transport main bearings as an example, the excavation distance of the parallel guide tunnels is long, and it is necessary to select strata with better surrounding rock conditions for shutdown excavation. According to the construction progress, it is estimated that at least 3 months of shutdown and waiting will be required, which will affect the construction progress. Summary of the invention

[0004] The invention provides a method for replacing a main bearing of a long-distance double-hole tunnel double-line linkage TBM, so as to solve the technical problems in the prior art.

[0005] In order to solve the above problems, the present invention provides a method for replacing the main bearing of a long-distance double-hole tunnel double-line linkage TBM, which adopts the following technical solution, including the following steps:

[0006] The left line continues to be excavated until the rear supporting equipment exceeds the position of the cutter head of the right line, and a transverse passage is excavated between the left and right lines as the main bearing transportation passage;

[0007] Simultaneously fix the right-line cutter disc, disengage the cutter disc, move the main engine backward, remove the inner and outer seals of the main drive, and remove the slag collecting bucket;

[0008] Build the portal frame, remove the drive plate and old main bearing;

[0009] A bearing replacement platform is built at the rear end of the portal frame. The old main bearing is hoisted to the bearing replacement platform by the lifting equipment on the top of the tunnel and flipped from vertical to horizontal. The disassembled old main bearing is transported to the left line through the main bearing transportation channel;

[0010] The new main bearing is transported from the left line to the right line, and the new main bearing is flipped from horizontal to vertical through the bearing replacement platform. The bearing replacement platform is removed, and the main engine is pushed forward to the side of the portal frame;

[0011] Install the new main bearing and drive disc to the main engine in sequence, remove the portal frame, and then install the slag bucket and the inner and outer seals of the main drive;

[0012] Debug the main drive during idling, and connect the cutter disc after checking that there is no abnormality.

[0013] As a further improvement, the angle between the main bearing transport channel and the left line or the right line satisfies rail transport, and the line turning radius is not less than 25m.

[0014] As a further improvement, the cutter head fixing includes the following steps:

[0015] Before fixing the cutterhead, move it back once to clean the slag at the bottom of the tunnel between the tunnel face and the cutterhead, then push the cutterhead 5-15cm away from the tunnel face, rotate the cutterhead to the set position, and then push the cutterhead against the tunnel face;

[0016] The cutter disc is laterally fixed, bottom supported and axially fixed respectively to limit the spatial freedom of the cutter disc to prevent the cutter disc from shifting.

[0017] As a further improvement, the portal frame is fixedly installed with a slide rail arranged along the front-rear direction, and a sliding trolley for driving the new main bearing or the driving disc to move is provided on the slide rail.

[0018] As a further improvement, when removing the drive disc, the sliding trolley moves to the top of the inner side of the drive disc to support the drive disc. After the drive disc is removed and separated from the main machine, the sliding trolley drives the drive disc to move to the front end of the slide rail in a vertical posture, and a temporary support for the drive disc is set at the bottom of the drive disc, so that the sliding trolley is fixed to the door frame;

[0019] When removing the old main bearing, set another sliding trolley on the slide rail and move it to the top of the old main bearing to support the old main bearing. After the old main bearing is separated from the main engine, the sliding trolley drives the old main bearing to move forward to the set position in a vertical posture, and set a temporary support for the old main bearing at the bottom of the old main bearing.

[0020] As a further improvement, top turning ears and bottom turning ears are installed on the top and bottom of the old main bearing respectively. The lifting equipment lifts the old main bearing and moves it to the bearing replacement platform. The bottom turning ears are rotatably connected with the ear seats of the bearing replacement platform. The old main bearing is flipped from vertical to horizontal by the lifting equipment, and then the old main bearing is transported to the left line.

[0021] As a further improvement, the old main bearing is transported to the rear of the left line for temporary storage to avoid the new main bearing.

[0022] The beneficial effects of the above technical solution of the present invention are as follows:

[0023] 1. The present invention adopts a double-hole tunnel double-line linkage method to replace the TBM main bearing. Compared with maintenance methods such as parallel guide tunnels and inclined shafts, the main bearing replacement method of the present invention has lower cost, a relatively shorter replacement cycle, and relatively less impact on the other line.

[0024] 2. The present invention utilizes the structure of the cutter disc, adopts the overall method of seven-point locking and four-position support at the bottom, ensures the stability of the cutter disc after being fixed, and is conducive to the precise docking of the cutter disc with the host. That is, anchor rods are installed at the top 5 scraper bins and the bottom 2 scraper bins at 55° on the left and right, a pad is set at the bottom of the cutter disc to support the cutter disc, and anchor rods are set at the corresponding knife holes to prevent the cutter disc from axial deviation, thereby ensuring the stability of the cutter disc. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0026] Figure 1 It is a replacement flow chart of the main bearing replacement method of the long-distance double-hole tunnel double-line linkage TBM of the present invention;

[0027] Figure 2 A schematic diagram of a new main bearing truck transportation method for replacing a main bearing of a long-distance double-hole tunnel double-line linkage TBM according to the present invention;

[0028] Figure 3 It is a structural schematic diagram of the main bearing transportation channel of the main bearing replacement method of the long-distance double-hole tunnel double-line linkage TBM of the present invention;

[0029] Figure 4 It is a cutterhead fixing flow chart of the main bearing replacement method of the long-distance double-hole tunnel double-line linkage TBM of the present invention;

[0030] Figure 5 A schematic diagram of the cutterhead fixing method of the main bearing replacement method of the long-distance double-hole tunnel double-line linkage TBM of the present invention;

[0031] Figure 6 It is a schematic diagram of the arrangement of the axial anchor rods of the main bearing replacement method of the long-distance double-hole tunnel double-line linkage TBM of the present invention;

[0032] Figure 7 It is a schematic diagram of a portal frame of a method for replacing a main bearing of a long-distance double-hole tunnel double-line linkage TBM of the present invention;

[0033] Figure 8 A schematic diagram of fixing a drive plate of a main bearing replacement method of a long-distance double-hole tunnel double-line linkage TBM of the present invention;

[0034] Fig. 9 A schematic diagram of the main bearing disassembly and assembly points of the main bearing replacement method of the long-distance double-hole tunnel double-line linkage TBM of the present invention;

[0035] Fig.10 It is a structural schematic diagram of a bearing replacement platform of a method for replacing main bearings of a long-distance double-hole tunnel double-line linkage TBM of the present invention;

[0036] Fig.11 A new main shaft replacement flow chart of the main bearing replacement method of the long-distance double-hole tunnel double-line linkage TBM of the present invention;

[0037] Fig.12 A schematic diagram of flipping a new main bearing or an old main bearing of a main bearing replacement method of a long-distance double-hole tunnel double-line linkage TBM of the present invention;

[0038] Fig.13 It is a schematic diagram of the main machine idle push position of the main bearing replacement method of the long-distance double-hole tunnel double-line linkage TBM of the present invention;

[0039] Fig.14 A reference diagram of maintenance evaluation standards for Example 2 of a method for replacing a main bearing of a long-distance double-hole tunnel double-line linkage TBM according to the present invention;

[0040] Fig.15 A maintenance operation flow chart of Example 2 of a method for replacing a main bearing of a long-distance double-hole tunnel double-line linkage TBM of the present invention;

[0041] Fig.16 This is a schematic diagram of the main bearing decomposition of Example 2 of the method for replacing the main bearing of a long-distance double-hole tunnel double-line linkage TBM of the present invention.

[0042] Description of reference numerals:

[0043] 1. New main bearing; 2. Flatbed truck; 3. Main bearing transportation channel; 4. Cutter head; 5. Main machine; 6. Equipment bridge; 7. Slide rail; 8. Gantry; 9. Main drive; 10. Sliding trolley; 11. Temporary support; 12. Bearing replacement platform; 13. Old main bearing; 14. Bearing disassembly gantry. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0045] In long-distance tunnel construction, due to the long tunnel distance, the service life and life of the TBM main bearing are exceeded, and emergency replacement is required. The difficulty of replacement lies in the following reasons: first, the TBM main bearing is large in size and indivisible for transportation, second, the main bearing installation location and installation method are special and difficult to remove, and third, the tunnel space is small, and the replacement and maintenance work requires a large space. The existing inclined shaft, vertical shaft or circuitous guide tunnel maintenance and replacement methods have problems such as high cost, low efficiency, high difficulty, and poor adaptability, which affect the construction progress and safety.

[0046] In response to the above problem, the present invention links the left line with the right line, and takes the replacement of the main bearing of the right line as an example. When the main bearing needs to be replaced, the left line continues to advance and waits for the rear supporting unit to surpass the cutter head position of the right line. A transverse channel is excavated behind the rear supporting unit of the left line as a main bearing transportation channel, and a space capable of accommodating the main bearing is reserved between the opening of the main bearing transportation channel and the rear supporting unit of the left line. After the old main bearing of the right line TBM is disassembled, it is first transported to the rear of the left line rear supporting unit through the main bearing transportation channel, and then the prepared new main bearing is transported to the right line through the main bearing transportation channel for installation.

[0047] After introducing the basic principle of the present invention, various non-limiting embodiments of the present invention are described in detail below. The number of any element in the drawings is for illustration and not for limitation, and any naming is only for distinction and does not have any limiting meaning.

[0048] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0049] Embodiment 1 of the method for replacing the main bearing of a long-distance double-hole tunnel double-line linkage TBM provided by the present invention is as follows: Figure 1-Figure 13 As shown, the following steps are included:

[0050] S1. Continue to excavate the left line until the rear supporting equipment exceeds the position of the right line cutterhead 4, and then dig a horizontal channel between the left and right lines as the main bearing transportation channel 3;

[0051] S2, simultaneously fix the right line cutter disc 4, disengage the cutter disc 4, retreat the main engine 5, disassemble the inner and outer seals of the main drive 9, and disassemble the slag collecting bucket;

[0052] S3, build the portal frame 8, remove the drive plate and the old main bearing 13;

[0053] S4, build a bearing replacement platform 12 at the rear end of the portal frame 8, lift the old main bearing 13 to the bearing replacement platform 12 through the lifting equipment on the top of the tunnel and flip it from vertical to horizontal, and transport the disassembled old main bearing 13 to the left line through the main bearing transportation channel 3;

[0054] S5, the new main bearing 1 is transported from the left line to the right line, the new main bearing 1 is flipped from horizontal to vertical through the bearing replacement platform 12, the bearing replacement platform 12 is removed, and the main machine 5 is pushed forward to the side of the portal frame 8;

[0055] S6. Install the new main bearing 1 and the drive disc to the main engine 5 in sequence, remove the portal frame 8, and then install the inner and outer seals of the slag collecting bucket and the main drive 9;

[0056] S7. Debug the main drive 9 in idle operation and connect it to the cutter head 4 after checking that there is no abnormality.

[0057] In step S1, Figure 3 As shown, a transverse passage is constructed 30 meters from the rear end of the rear supporting structure (first, the nearest connecting passage of the left and right lines is used as the transverse passage. If the connecting passage cannot meet the requirements, a new transverse passage is excavated). Its size is based on accommodating the special transport flatbed truck 2 for the main bearing. In this embodiment, the width × height of the transverse passage = 7.5 × 4.3m; the angle between the transverse passage and the main tunnel meets the requirements of rail transportation, and the turning radius of the line is not less than 25m.

[0058] like Figure 4-Figure 6 As shown, the fixing of the cutter disc 4 includes the following steps:

[0059] Before the cutterhead 4 is fixed, it is first retracted for one cycle. In this embodiment, one cycle is 1.8 meters. The slag at the bottom of the tunnel between the tunnel face and the cutterhead 4 is cleaned. Then the cutterhead 4 is pushed 10 cm away from the tunnel face. In manual mode, the scraping bin where the cutterhead 440# is located is moved to the bottom of the tunnel. Then the cutterhead 4 is pushed to press against the tunnel face.

[0060] The cutter disc 4 is laterally fixed, bottom supported and axially fixed respectively, and the spatial freedom of the cutter disc 4 is limited to prevent the cutter disc 4 from shifting.

[0061] Lateral fixation: 10 anchor rods are installed in each of the 5 scraper bins on the top, and 6 anchor rods are installed in each of the 2 scraper bins at 55° on the bottom. There are seven fixed points in total, with a total of 72 anchor rods. The anchor rods are made of φ25 threaded steel, with a cutting length of 3m and an anchoring length of 2.5m.

[0062] Bottom support: The cutter disc 4 is supported at the three bottom scraper bins, and four support points are set. First, a suitable steel plate is inserted between the outer ring plate of the cutter disc 4 and the hole wall; then the support plate is placed between the cone plate on the back of the cutter disc 4 and the hole wall. The distribution angle of the support plate overlaps with the angle of the pad plate, and is welded to the cutter disc 4.

[0063] Axial fixation: At the four knife hole positions of 27#, 28#, 29#, and 30#, three anchor holes are made in each knife hole. A 600*250*20mm steel plate is used to cut holes through the anchors and lock them. The axial anchor uses a 3m long, φ25 fiberglass anchor.

[0064] In step S2, the cutter head 4 is disengaged, including the following steps:

[0065] Before disengagement, check the fixing status of the cutterhead 4 to confirm that it is firmly fixed and can be disengaged only when the disengagement conditions are met. Record the data of the guide system before disengagement and the original position of the TBM in detail for use when docking the cutterhead 4. The original position of the TBM includes the position of the gripper shoe, the extension length of the top gripper shoe cylinder, the extension length of the torque cylinder and the position of the rear edge of the side shield, the connection position mark between the drive disc and the cutterhead 4 (no less than 4 places), etc. Make the mark before disengaging the cutterhead 4;

[0066] Remove all the protective caps of the stud bolts connecting the cutter disc 4;

[0067] Reduce the bolt pulling pressure gradually three times in sequence. Completely loosen the bolts for the last time, remove the nuts, then remove the stud bolts, clean them with kerosene, apply hydraulic oil, and store them properly.

[0068] The order of loosening and removing bolts: 4 to 5 bolts in a batch, one by one;

[0069] After the bolts are removed, check the connection between the cutter disc 4 and the main drive 9 again. After confirming that all are disconnected, the cutter disc 4 can be disengaged. Place four 100-ton thin jacks between the cutter disc 4 and the main drive 9. First, use the jacks and thrust cylinders to smoothly separate the cutter disc 4 from the main drive 9. The separation distance should be more than 50 mm.

[0070] Disassemble the inner and outer seals of the main drive 9:

[0071] After the cutter disc 4 is successfully separated, the main machine 5 retreats 1.2 meters, and a seal disassembly platform is built between the cutter disc 4 and the main drive 9. A slideway is welded at a suitable position between the main drive 9 and the cutter disc 4 for moving the ring after removal. A lifting lug is welded on the top of the outer sealing pressure ring, and the hoist is hung and tightened.

[0072] Weld 2-3 hanging rods on the back of the cutter head 4 to temporarily store the sealing rings and spacer rings;

[0073] Weld a lifting lug (lifting weight 3 tons) above the top shield for installing a hand chain hoist. Weld a pull plate assembly on the cutter head 4, a total of 6 locations, for removing and installing the outer seal clamping ring, the outer seal outer spacer ring and the outer seal inner spacer ring. The pull plate assembly hole is aligned with the threaded hole of the outer seal clamping ring;

[0074] Remove the bolts according to the diagonal principle and mark the positions;

[0075] Remove the hexagon socket screws, outer seal protection plate, outer seal pressure ring, outer seal lip seal, and outer seal spacer ring of the outer seal ring in sequence, place them in the hanging position on the back of the cutter head 4 (a steel rod can be inserted into the bolt hole of the cutter head 4 for storage), and measure the wear of the outer seal wear track and lip seal;

[0076] Insert bolts into the bolt holes on the top of the drive disc, tighten the hoisting plate (can hoist 3T weight) and install the hand chain hoist; weld the pull plate assembly on the inner panel of the cutter disc 4, a total of 6 places, for taking out and installing the inner seal clamping ring, inner seal outer spacer ring and inner seal inner spacer ring, and align the pull plate assembly hole with the threaded hole of the outer seal clamping ring; remove the inner seal ring parts hexagon screws, inner seal labyrinth ring 1, inner seal labyrinth ring 2, inner seal, pressure ring, inner seal lip seal, inner seal spacer ring in turn in the same way as the outer seal disassembly method, and place them on the back of the cutter disc 4. Measure the wear of the inner seal wear track and lip seal.

[0077] Dismantle the slag bucket:

[0078] After the seal and ring parts are removed and stored, the working platform is removed and the main machine 5 is continued to move back to reserve space (≥2 meters) for the removal of the slag bucket.

[0079] Build a disassembly platform; weld lifting lugs on the top shield, and use the lifting lugs on the slag bucket to hang the hoist and tighten the hoist.

[0080] Remove the pin shaft between the slag bucket and the drive box.

[0081] Lift the slag bucket and move it to a position close to the cutter head 4.

[0082] like Figure 7 As shown, in step S3, building the portal frame 8 includes the following steps:

[0083] The main machine 5 moves back to the installation position of the portal frame 8 and stops when the top shield is exposed for 3 meters;

[0084] Build the portal frame 8, and the main frame is built from bottom to top. The bottom is fixed in time after it is built, and the main frame is fixed to the cave wall by anchor rods;

[0085] After the portal frame 8 is erected, the bottom steel sleeper and the slide rail 7 are installed;

[0086] After the bottom steel sleepers are laid, the slide rails 7 are welded to the main beam through the portal frame 8, and the diagonal supports are installed.

[0087] like Figure 8 As shown, removing the drive disk includes the following steps:

[0088] Remove the three (11 to 13) drive plate gear ring connection bolts on the left and right sides of the top, and use M48×700 studs and washers to install the sliding trolley 10 bracket and the bottom slide rail 7 support rubber pad;

[0089] After the installation of the sliding trolley 10 is completed, remove the studs between the drive plate and the main bearing three times according to the diagonal principle, place them in a suitable area, check whether the studs are damaged, and mark the installation holes of the bolts;

[0090] Draw a line at the position of the motor torque limiter to mark the position and use a thin line to mark the rotation direction (the length of the line ensures that the torque limiter can rotate 5 times);

[0091] Use M30 screws to push the base outward at 8 points at the same time. Pay attention to keeping the screw sizes of each screw consistent to ensure that the drive disc slides out of the installation cavity evenly in the circumferential direction. Synchronously move the sliding trolley 10 to ensure that the drive disc is vertical. Four M48×1300 guide rods can be installed in advance in the bottom bolt holes. At the same time, arrange someone on the motor side to record the direction and displacement of each motor when it is disengaged to provide a reference for the drive disc when docking.

[0092] After the drive disc is completely separated from the installation cavity, it is moved to the door frame 8 and fixed, and the bottom is supported and fixed by two supporting points; use kerosene to thoroughly clean the surface of the drive disc and the driving large gear ring, and check whether the large gear ring is damaged (at the same time mark the position of the small gear to prevent the position from being changed during subsequent work).

[0093] like Fig.10 As shown, disassembling the old main bearing 13 includes the following steps:

[0094] Set another sliding trolley 10 on the slide rail 7 and move it to the top of the old main bearing 13 to support the old main bearing 13. Install M56 lifting rings at the three lifting points of the main bearing. Use three 2T hoists at the corresponding positions of the portal frame 8 to pull the old main bearing 13 outward at the same time. Pay attention to keeping the hoist sizes consistent (or use 4RLT-41 flat jacks between the bearing and the drive box, and four jacks are evenly stressed at the same time) to ensure that the old main bearing 13 slides out of the installation cavity evenly in the circumferential direction.

[0095] After the old main bearing 13 is separated from the main engine 5, the sliding trolley 10 drives the old main bearing 13 to move forward to a set position in a vertical posture, and a temporary support 11 for the old main bearing 13 is set at the bottom of the old main bearing 13;

[0096] In step S4, the top turning ear and the bottom turning ear are installed on the top and bottom of the old main bearing 13 respectively, the lifting equipment lifts the old main bearing 13 and moves it to the bearing replacement platform 12, the bottom turning ear is rotatably connected with the ear seat of the bearing replacement platform 12, and the old main bearing 13 is flipped from vertical to horizontal by the lifting equipment, and then the left rear assembly is temporarily stored.

[0097] Thereafter, the new main bearing 1 is transported to the bearing replacement platform 12 .

[0098] Before the main engine 5 is advanced, the temporary track is removed and debris in front of the main engine 5 that affects the advancement is cleared.

[0099] The subsequent installation and debugging steps will not be repeated here.

[0100] Example 2

[0101] This embodiment discloses an emergency maintenance method for the main bearing of a long-distance single-hole tunnel TBM. The starting condition is: if the surrounding rock conditions are good and a large torque fluctuation of 800KN.M-1500KN.M occurs during the dry push, the machine is immediately shut down for investigation. If it is determined that the condition of the old main bearing has a tendency to deteriorate or has deteriorated sharply (in this embodiment, the old main bearing refers to the main bearing currently in use), after evaluation (evaluation criteria such as Fig.14 As shown, for example, shallow damage with a depth of less than 3mm is considered to be relatively light damage, otherwise it is considered to be relatively heavy damage). If the damage to the old main bearing raceway is relatively light and only repair is required to meet the excavation needs of the remaining sections of the entire project, the machine will be shut down and the old main bearing maintenance plan will be initiated; otherwise, the old main bearing replacement plan will be initiated.

[0102] like Fig.15 As shown in the figure, the emergency maintenance method of the main bearing of the long-distance single-hole tunnel TBM includes the following steps:

[0103] S1. Preliminary preparation work: If short-distance excavation can be met, continue to advance 18 meters, and the newly installed invert block will not be cast at the bottom. The initial support will be in the form of anchor rods + mesh + initial spraying. If excavation is not possible, the arch frame and invert block will be gradually removed during the retreat of the main engine, and the arch part will be sprayed simultaneously; at the same time, prepare the old main bearing retainer, rollers and other parts.

[0104] S2, the cutter disc is fixed.

[0105] S3, the cutter disc is detached.

[0106] S4. Disassemble the inner and outer seals of the main drive.

[0107] S5. Disassemble the slag collecting bucket.

[0108] S6. Build a door frame.

[0109] S7. Remove the drive disk.

[0110] S8. Remove the old main bearing.

[0111] S9. Check and clean the drive box.

[0112] Steps S2 to S9 are the same as those in Example 1 and will not be described in detail in this example.

[0113] S10. Build a maintenance platform, install the bearing turning lugs, and build the bearing disassembly gantry and lifting equipment (or other lifting and hoisting equipment).

[0114] S11. Repair of old main bearing: First, use lifting equipment to turn the old main bearing from vertical to horizontal;

[0115] Secondly, disassemble the old main bearing, such as Fig.16 As shown, disassembling the old main bearing includes the following steps:

[0116] (1) Hang a 10T hoist according to the position of the bearing lifting point and install it at the lifting point of the inner ring of the bearing with three M56 lifting eye screws;

[0117] (2) Make alignment marks on the inner diameters of the two inner rings, then remove the screws connecting the two inner rings, the hexagon socket screws and plastic rods that protect the inner ring locating pins, and finally lift the inner rings;

[0118] (3) Lift the inner ring to a certain height and fix it, remove the push roller and cage, and check the raceway surface of the push roller; then remove the radial roller and cage, and then take the roller out of the cage;

[0119] (4) Lift the outer ring of the bearing through the lifting points on the wall of the cave and four 10T hoists, and remove the reverse row rollers and cages;

[0120] After that, repair the old main bearing and replace all rollers, cages, seals, and spring units under the thrust raceway. Fig.14 to process;

[0121] Finally, reassemble the old main bearing; after all raceway surfaces are repaired, install the summer push rollers and cages; at the same time, place 3 sets of radial rollers evenly on the radial raceways; remove the temporary support of the outer ring, and slowly insert the outer ring into the inner ring; install the radial rollers and cages; install the main push rollers and cages; remove the fixed support on the inner ring, and slowly lower the inner ring. After the inner ring is installed, install the locking screws and tighten them in place.

[0122] S12. Reinstall the old main bearing, drive plate, slag bucket and other parts to the main engine.

[0123] S13, no-load test of main drive; after the installation of internal and external seals, remove the installation platform and cut off the auxiliary lifting lugs, and fill the drive box with gear oil; after checking whether there is any interference in the drive, drive the equipment to idle; during equipment commissioning, check in detail whether there is any abnormality in the drive box; check whether there is gear oil in the detection cavity of the internal and external seal system of the main drive.

[0124] S14. Install the cutter disc.

[0125] In this embodiment, if it involves replacing the old main bearing inner ring or the old main bearing outer ring, the old main bearing inner ring or the old main bearing outer ring can be transported in the way of transporting the new main bearing in Embodiment 1.

[0126] Although this specification has shown and described a plurality of embodiments of the present invention, it is obvious to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art will think of many changes, modifications and alternatives without departing from the thought and spirit of the present invention. It should be understood that in the process of practicing the present invention, various alternatives to the embodiments of the present invention described herein may be adopted. The attached claims are intended to define the scope of protection of the present invention, and therefore cover the modular composition, equivalent or alternatives within the scope of protection of these claims.

Claims

1. A method for replacing the main bearing of a long-distance double-hole tunnel double-line linkage TBM, characterized in that: The following steps are involved: The left line continues to be excavated until the rear supporting equipment exceeds the position of the cutter head of the right line, and a transverse passage is excavated between the left and right lines as the main bearing transportation passage; Simultaneously fix the right-line cutter disc, disengage the cutter disc, move the main engine backward, remove the inner and outer seals of the main drive, and remove the slag collecting bucket; Build the portal frame, remove the drive plate and old main bearing; A bearing replacement platform is built at the rear end of the portal frame. The old main bearing is hoisted to the bearing replacement platform by the lifting equipment on the top of the tunnel and flipped from vertical to horizontal. The disassembled old main bearing is transported to the left line through the main bearing transportation channel; The new main bearing is transported from the left line to the right line, and the new main bearing is flipped from horizontal to vertical through the bearing replacement platform. The bearing replacement platform is removed, and the main engine is pushed forward to the side of the portal frame; Install the new main bearing and drive disc to the main engine in sequence, remove the portal frame, and then install the slag bucket and the inner and outer seals of the main drive; Debug the main drive during idling, and connect the cutter disc after checking that there is no abnormality.

2. The method for replacing the main bearing of a long-distance double-hole tunnel double-line linkage TBM according to claim 1 is characterized in that: The angle between the main bearing transport channel and the left line or the right line satisfies rail transportation, and the line turning radius is not less than 25m.

3. The method for replacing the main bearing of a long-distance double-hole tunnel double-line linkage TBM according to claim 1 is characterized in that: The cutter head fixing includes the following steps: Before fixing the cutterhead, move it back once to clean the slag at the bottom of the tunnel between the tunnel face and the cutterhead, then push the cutterhead 5-15cm away from the tunnel face, rotate the cutterhead to the set position, and then push the cutterhead against the tunnel face; The cutter disc is laterally fixed, bottom supported and axially fixed respectively to limit the spatial freedom of the cutter disc to prevent the cutter disc from shifting.

4. The method for replacing the main bearing of a long-distance double-hole tunnel double-line linkage TBM according to claim 1 is characterized in that: The portal frame is fixedly provided with a slide rail arranged along the front-rear direction, and a sliding trolley for driving a new main bearing or a driving disc to move is arranged on the slide rail.

5. The method for replacing the main bearing of a long-distance double-hole tunnel double-line linkage TBM according to claim 4 is characterized in that: When removing the drive disc, the sliding trolley moves to the top of the inner side of the drive disc to support the drive disc. After the drive disc is removed and separated from the main machine, the sliding trolley drives the drive disc to move to the front end of the slide rail in a vertical posture, and a temporary support for the drive disc is set at the bottom of the drive disc to fix the sliding trolley on the door frame; When removing the old main bearing, set another sliding trolley on the slide rail and move it to the top of the old main bearing to support the old main bearing. After the old main bearing is separated from the main engine, the sliding trolley drives the old main bearing to move forward to the set position in a vertical posture, and set a temporary support for the old main bearing at the bottom of the old main bearing.

6. The method for replacing the main bearing of a long-distance double-hole tunnel double-line linkage TBM according to claim 5 is characterized in that: Install the top turning lifting ear and the bottom turning lifting ear on the top and bottom of the old main bearing respectively. Lift the old main bearing with the lifting equipment and move it to the bearing replacement platform. The bottom turning lifting ear is rotatably connected with the ear seat of the bearing replacement platform. The old main bearing is flipped from vertical to horizontal by the lifting equipment, and then the old main bearing is transported to the left line.

7. The method for replacing the main bearing of a long-distance double-hole tunnel double-line linkage TBM according to claim 6 is characterized in that: The old main bearing is transported to the rear of the left line for temporary storage to avoid the new main bearing.

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