Method for repairing fractured connecting bolt of cutterhead and main drive in construction stage of shield

Abstract

The invention relates to the technical field of shield tunnel engineering construction, in particular to a repairing method for fracture of a cutter head and main drive connecting bolt in the construction stage of a shield. The method specifically comprises the following steps that S1, a magnetic drill is provided, and a broken wire of the connecting bolt is cut and taken out through the magnetic drill; s2, whether the internal threads are damaged or not is judged, and when the internal threads are not damaged, new connecting bolts are provided and installed in the bolt holes; when the internal thread is damaged, the bolt hole is expanded; s3, a tapping tool is provided, and tapping is conducted on the reamed bolt hole; and S4, new bolts are manufactured, and the new bolts are installed. The drilling tool has the beneficial effects that the magnetic seat drill and the positioning tool are installed on the cutter flange ring of the shield, the magnetic seat drill is used for cutting broken wires in bolt holes, whether reaming and tapping are needed or not is judged according to the damage condition of internal threads, on the premise that the safety of shield equipment is not affected, reaming and tapping are conducted on the bolt holes, and the machining efficiency of the shield equipment is improved. And new bolts are produced for installation and fixation.

Description

Technical Field

[0001] The invention relates to the technical field of shield tunnel engineering, and in particular to a method for repairing broken connecting bolts between a cutter head and a main drive of a shield during a construction stage. Background Art

[0002] The shield machine excavates the soil and provides local support for the tunnel face by rotating the cutterhead. The power required for the rotation of the cutterhead is transmitted by the main drive system, that is, the tunnel is advanced through the main drive-cutterhead force transmission path. The main drive and the cutterhead are connected by a high-strength bolt group. The connecting bolts are an important link for energy efficiency transmission between key components. Because the main drive and the cutterhead connecting bolt group are in a limited space soil bin, it is impossible to evaluate their working status in time. In the complex underground construction process, the bolt group is always affected by the combination of many factors such as quality defects, initial installation errors, eccentric force, low-frequency vibration load and environmental erosion. When individual bolts are fatigued and withdraw from work, the internal force will be redistributed, thereby changing the stress state of the bolt group. Due to the combined influence of excessive local stress and low-frequency vibration, a large number of bolt threads will be damaged and broken, and even the cutterhead and the main drive will be partially misaligned. Therefore, it is necessary to repair the connecting bolt group in a limited space to ensure the smooth penetration of the tunnel.

[0003] At present, the main method for repairing the bolts connecting the cutter head and the main drive is to use an EDM punch to drill holes on the broken bolts to create an internal drive system or to weld the broken bolts to reinforce the connection parts to create an external drive system - remove the broken bolts - and replace the bolts in situ. This method itself has a low success rate. In addition, it is impossible to repair the internal threads of the bolt holes, and it is impossible to evaluate the bearing capacity performance after replacing the bolts. To ensure the safety of the equipment, the shield machine can only be downgraded after the in-situ repair.

[0004] Therefore, the present invention proposes a method for repairing the broken connecting bolts between the cutter head and the main drive of the shield during the construction stage. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide a method for repairing broken connecting bolts between the cutter head and the main drive of a shield during the construction stage, so as to solve the problems that the existing broken bolt repair method has a high construction risk and the cutter head is easy to fall, affecting subsequent construction.

[0006] The technical solution to achieve the above purpose is:

[0007] The present invention provides a method for repairing the broken connecting bolts between the cutter head and the main drive of a shield during the construction stage, which specifically comprises the following steps: S1: providing a magnetic drill and a positioning tool, assembling the positioning tool with the magnetic drill and installing them on the cutter head flange ring of the cutter head, adjusting the position of the drill rod of the magnetic drill by adjusting the positioning tool, and cutting out the broken wire of the connecting bolt by the magnetic drill; S2: Determine whether the internal thread in the bolt hole is damaged. If the internal thread is not damaged, provide a new connecting bolt and install the connecting bolt into the bolt hole. When the internal thread is damaged, the bolt hole is expanded by the magnetic drill; S3: After the hole enlargement is completed, a tapping tool is provided, and the tapping tool is used to perform multiple tapping on the enlarged bolt hole to form a new bolt hole; S4: making a new bolt, and screwing the new bolt into a new bolt hole.

[0008] Furthermore, the specific steps of cutting and removing the broken wire by the magnetic drill are as follows: A first hollow drill bit is provided and installed on the drill rod of the magnetic drill, and the first hollow drill bit is inserted into the bolt hole to expand the cutter head flange ring through hole on the cutter head flange ring and the light hole section on the main drive to form a first cutter head flange ring through hole on the cutter head flange ring and a first light hole section on the main drive, and the first hollow drill bit is removed after the expansion is completed; Providing a second hollow drill bit, installing the second hollow drill bit on the drill rod of the magnetic drill, allowing the second hollow drill bit to pass through the first cutter head flange ring through hole of the bolt hole and the first light hole section and extend into the screw hole section of the bolt hole to cut the broken wire, and removing the second hollow drill bit after the cutting is completed; A third hollow drill bit is provided, wherein the diameter of the third hollow drill bit is greater than the diameter of the second hollow drill bit and is adapted to the inner diameter of the bolt hole; the third hollow drill bit is installed on the drill rod of the magnetic drill, so that the third hollow drill bit extends into the screw hole section of the bolt hole to further cut the broken wire; and the third hollow drill bit is removed after the cutting is completed.

[0009] Furthermore, before using the first hollow drill bit for cutting, a positioning rod is provided and inserted into the bolt hole, and the position of the magnetic drill is adjusted by the positioning tool so that the drill rod of the magnetic drill and the positioning rod are located on the same axis, and then the positioning rod is taken out.

[0010] Furthermore, after the broken wire is cut twice, a milling cutter is provided, and the external thread of the broken wire is cut out by the milling cutter.

[0011] Furthermore, the step of expanding the bolt hole is specifically as follows: Providing a fourth hollow drill bit and installing it on the drill rod of the magnetic drill, so that the fourth hollow drill bit expands the first cutter head flange ring through hole to form a second cutter head flange ring through hole, and removing the fourth hollow drill bit after the expansion is completed; Providing a fifth hollow drill bit and installing it on the drill rod of the magnetic drill, so that the fifth hollow drill bit expands the first light hole segment to form a second light hole segment, and after the expansion is completed, removing the fifth hollow drill bit; A sixth hollow drill bit is provided and installed on the drill rod of the magnetic drill, so that the sixth hollow drill bit expands the screw hole section to form a first screw hole section, and the sixth hollow drill bit is removed after the expansion is completed.

[0012] Furthermore, before using the sixth hollow drill bit to expand the screw hole section, a steel collar stabilizer is provided, the inner diameter of the provided steel collar stabilizer is adapted to the diameter of the sixth hollow drill bit, and the outer diameter is adapted to the inner diameter of the second light hole section, and the steel collar is sleeved on the sixth hollow drill bit to achieve positioning of the sixth hollow drill rod.

[0013] Furthermore, when the sixth hollow drill bit is used to expand the hole three times, the concentricity of the second light hole segment and the first screw hole segment is checked, and the specific checking steps are as follows: Process three test steel rods including a first rod portion and a second rod portion, so that the first rod portion and the second rod portion are coaxially arranged, the size of the first rod portion is adapted to the size of the second light hole segment, the diameter of the second rod portion is adapted to the inner diameter of the first screw hole segment, and the lengths of the second rod portions of the three test steel rods are 1 / 3, 2 / 3, and 3 / 3 of the length of the first screw hole segment, respectively, and a handle is fixedly arranged at the rear end of the first rod portion; After the sixth hollow drill bit has expanded its hole to 1 / 3, 2 / 3, and 3 / 3 respectively, the corresponding test steel rod is inserted into the second light hole section and the first screw hole section. When the test steel rod can be inserted, it is determined that the concentricity of the second light hole section and the first screw hole section meets the design requirements and the next step is performed. When the test steel rod cannot be inserted, it is determined that the concentricity does not meet the design requirements and the step is repeated to adjust the first screw hole section.

[0014] Furthermore, the specific steps of performing multiple tapping on the expanded bolt hole are as follows: Remove the magnetic drill and install the tapping tool on the cutter head; A first tap, a second tap and a third tap are provided, the first tap, the second tap and the third tap are sequentially mounted on the tapping tool, and the inner wall of the first screw hole section is tapped by the tapping tool.

[0015] Furthermore, the diameters of the cone heads of the first tap, the second tap and the third tap are larger than the diameter of the rod. When performing tapping, a positioner is provided and sleeved on the rod, and the positioner is inserted into the bolt hole for fixing. The inner diameter of the positioner matches the rod, and the outer diameter matches the inner diameter of the bolt hole.

[0016] Compared with the prior art, the present invention has the following beneficial effects: By installing a magnetic drill and positioning tooling on the shield's cutter flange ring, the broken wires in the bolt holes are cut using the magnetic drill, and whether expansion and tapping are required is determined based on the damage to the internal threads. Without affecting the safety of the shield equipment, the bolt holes are expanded and tapped, and new bolts are produced for installation and fixation.

[0017] The holes are gradually enlarged by hollow drill bits of different sizes, and the bolt holes are tapped using tapping tools to repair the bolt holes. New bolts with higher national standard strength and larger size are anchored into the bolt holes to increase the connection performance between the cutter head and the main drive.

[0018] During the process of hole expansion and tapping, a test steel rod is used to check the concentricity of the bolt hole after expansion, and a test bolt is used to check the internal thread of the bolt hole after tapping, so as to ensure the accuracy of the bolt hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a construction flow chart of a method for repairing broken connecting bolts between a cutter head and a main drive of a shield during the construction stage.

[0020] Figures 2 to 4 The present invention is a schematic diagram of the connection between the cutter head and the main drive of the shield machine according to the method for repairing the broken connecting bolts between the cutter head and the main drive during the construction stage.

[0021] Figure 5 The schematic diagram of the installation of the first hollow drill bit of the method for repairing the broken connecting bolts between the cutter head and the main drive of the shield during the construction stage of the present invention is shown.

[0022] Figures 6 to 8 The schematic diagram of the test steel rod structure and installation of the method for repairing the broken connecting bolts between the cutter head and the main drive of the shield during the construction stage of the present invention is shown.

[0023] Fig. 9The present invention is a schematic diagram of the magnetic drill structure of the method for repairing the broken connecting bolts between the cutter head and the main drive of the shield during the construction stage.

[0024] Fig.10 The present invention is a schematic diagram of removing broken wires in a method for repairing broken connecting bolts between a cutter head and a main drive of a shield during the construction stage.

[0025] Fig.11 The present invention is a schematic diagram of removing the broken external thread of the shield machine according to the method for repairing the broken connecting bolts between the cutter head and the main drive during the construction stage.

[0026] Fig.12 The present invention is a schematic structural diagram of a steel collar centralizer according to a method for repairing broken connecting bolts between a cutter head and a main drive of a shield machine during construction.

[0027] Fig.13 This is a schematic diagram of the installation of test steel rods for the method of repairing the broken connecting bolts between the cutter head and the main drive of the shield during the construction stage of the present invention.

[0028] Fig.14 The present invention is a schematic diagram of the installation of a tapping system for a method of repairing broken connecting bolts between a cutter head and a main drive of a shield during the construction phase.

[0029] Figure 15 to Figure 16 The present invention is a schematic diagram of the tapping tool structure of a method for repairing broken connecting bolts between a cutter head and a main drive of a shield during the construction stage.

[0030] Fig.17 The present invention is a schematic diagram of the positioner structure of the method for repairing the broken connecting bolts between the cutter head and the main drive of the shield during the construction stage.

[0031] Fig.18 The present invention is a schematic diagram of a tap structure of a method for repairing broken connecting bolts between a cutter head and a main drive of a shield during the construction phase.

[0032] Fig.19 The schematic diagram of the newly manufactured bolt structure of the method for repairing the broken connecting bolts between the cutter head and the main drive of the shield during the construction stage of the present invention is shown.

[0033] Fig. 20 The present invention is a schematic diagram of the bolt anti-loosening sleeve structure of a method for repairing broken connecting bolts between a cutter head and a main drive of a shield during the construction stage.

[0034] Legend: 1. Shield machine; 2. Soil layer; 3. Corbel; 4. Cutterhead flange ring; 5. Connecting bolts; 6. Main drive; 7. Cutterhead flange ring through hole; 8. Gasket hole; 9. Sealing plate bolts; 10. Light hole section; 11. Screw hole section; 12. Connecting bolt reinforcement rod; 13. Magnetic drill; 14. First hollow drill bit; 15. Positioning rod; 16. Reference line; 17. Front vertebral body; 18. Middle cylinder; 19. Tail thin rod; 20. Connecting piece; 21. Positioning fixture; 22. Rectangular steel plate; 23. Right-angle trapezoidal steel plate; 24. First weld; 25. Adjustable bolt; 26. Second weld; 27. Second Hollow drill bit; 28. Seamless round steel pipe; 29. ​​Inner steel plate; 30. External thread; 31. Milling cutter; 32. Steel sleeve centralizer; 33. Front steel sleeve; 34. Rear steel sleeve; 35. Test steel rod; 36. First rod; 37. Second rod; 38. Torque multiplier; 39. Tapping tool; 40. First sleeve; 41. Homemade nut; 42. Positioner; 43. Tap; 44. Third weld; 45. Channel steel; 46. Special-shaped steel plate; 47. Angle steel; 48. Circular ring plate; 49. Second sleeve; 50. New bolt; 51. New bolt reinforcement rod; 52. Bolt anti-loosening sleeve. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0036] See also Figure 1 The present invention provides a method for repairing the broken bolts connecting the cutter head and the main drive of a shield during the construction stage, which solves the problem that the existing broken bolt repair method has a high construction risk and the cutter head is easy to fall, affecting the subsequent construction. By installing a magnetic drill and a positioning tool on the cutter head flange ring of the shield, the broken wire in the bolt hole is cut with the magnetic drill, and it is determined whether the hole needs to be enlarged and tapped according to the damage of the internal thread. Under the premise of not affecting the safety of the shield equipment, the bolt hole is enlarged and tapped, and new bolts are produced for installation and fixation.

[0037] The holes are gradually enlarged by hollow drill bits of different sizes, and the bolt holes are tapped using tapping tools to repair the bolt holes. New bolts with higher national standard strength and larger size are anchored into the bolt holes to increase the connection performance between the cutter head and the main drive.

[0038] During the process of hole expansion and tapping, a test steel rod is used to check the concentricity of the bolt hole after expansion, and a test bolt is used to check the internal thread of the bolt hole after tapping, so as to ensure the accuracy of the bolt hole.

[0039] The following is a description of a method for repairing a broken connecting bolt between a cutter head and a main drive of a shield machine during a construction phase according to the present invention, in conjunction with the accompanying drawings.

[0040] See also Figure 1 , showing the construction flow chart of the method for repairing the broken connecting bolts between the cutter head and the main drive of the shield during the construction stage of the present invention. Figures 2 to 4 , showing a schematic diagram of the connection between the cutter head and the main drive of the shield during the construction stage of the present invention. Figures 1 to 4 , a method for repairing broken connecting bolts between a cutter head and a main drive of a shield machine during the construction stage of the present invention is described.

[0041] like Figures 1 to 4 As shown, a method for repairing the broken connecting bolts between the cutter head and the main drive of a shield during the construction stage of the present invention specifically comprises the following steps: S1: Provide a magnetic drill 13 and a positioning tool 21, assemble the positioning tool 21 with the magnetic drill 13 and install them on the cutter head flange ring 4 of the cutter head, adjust the position of the drill rod of the magnetic drill 13 by adjusting the positioning tool 21, and cut out the broken wire of the connecting bolt 5 by the magnetic drill 13; S2: Determine whether the internal thread in the bolt hole is damaged. If the internal thread is not damaged, provide a new connecting bolt 5 and install the connecting bolt 5 into the bolt hole. When the internal thread is damaged, the bolt hole is expanded by the magnetic drill 13; S3: After the hole expansion is completed, a tapping tool 39 is provided, and the tapping tool 39 is used to perform multiple tapping on the bolt hole after the hole expansion to form a new bolt hole; S4: Make a new bolt 50, and screw the new bolt 50 into a new bolt hole.

[0042] In a specific embodiment, the newly made bolt 50 includes a cylindrical newly made bolt reinforcement rod 51, the outer surface of the newly made bolt reinforcement rod 51 is a smooth surface, a nut fixed at the first end of the newly made bolt reinforcement rod 51, and a threaded section fixed at the second end of the newly made bolt reinforcement rod 51.

[0043] In a specific embodiment, the outer circumference of the main drive 6 is provided with a plurality of sealing pressure plate bolts 9 screwed into the main drive 6, and there is a distance between the design range of the newly manufactured bolts 50 and the design range of the sealing pressure plate bolts 9 to avoid affecting the fixing function of the two.

[0044] In a specific embodiment, when inspecting the bolt hole, a rust remover is used to clean the bolt hole, and an imaging tool such as an endoscope is provided to inspect the condition of the internal thread. When more than two threads of the internal thread are damaged, expansion and tapping are performed.

[0045] In a specific embodiment, the bolt holes are located on the cutter disc flange ring 4 and the main drive 6, and the bolt holes include, from shallow to deep: a gasket hole 8, a cutter disc flange ring through hole 7, a light hole section 10, and a screw hole section 11. The gasket hole 8 and the cutter disc flange ring through hole 7 are located on the cutter disc flange ring 4, the internal thread is located on the inner wall of the screw hole section 11, and the broken wire is located in the screw hole section 11.

[0046] In a specific embodiment, the specific steps of cutting and removing the broken wire by the magnetic drill 13 are as follows: A first hollow drill bit 14 is provided and installed on the drill rod of the magnetic drill 13, and the first hollow drill bit 14 is used to extend into the bolt hole to expand the cutter head flange ring through hole 7 located on the cutter head flange ring 4 and the light hole segment 10 located on the main drive 6 to form a first cutter head flange ring through hole on the cutter head flange ring 4 and a first light hole segment on the main drive 6. After the expansion is completed, the first hollow drill bit 14 is removed; the cutter head flange ring through hole 7 is expanded by using the first hollow drill bit 14 to form a first cutter head flange ring through hole, and the light hole segment 10 is expanded to form a first light hole segment, thereby eliminating the misalignment between the cutter head flange ring through hole 7 and the light hole segment; Provide a second hollow drill bit 27, install the second hollow drill bit 27 on the drill rod of the magnetic drill 13, make the second hollow drill bit 27 pass through the first cutter head flange ring through hole of the bolt hole and the first light hole section and extend into the screw hole section 11 of the bolt hole to cut the broken wire, and remove the second hollow drill bit 27 after cutting; A third hollow drill bit is provided, wherein the diameter of the third hollow drill bit is larger than the diameter of the second hollow drill bit 27 and is adapted to the inner diameter of the bolt hole. The third hollow drill bit is installed on the drill rod of the magnetic drill 13 so that the third hollow drill bit extends into the screw hole section 13 of the bolt hole to further cut the broken wire. After the cutting is completed, the third hollow drill bit is removed.

[0047] More specifically, before using the first hollow drill bit 14 for cutting, a positioning rod 15 is provided and inserted into the bolt hole. The position of the magnetic drill 13 is adjusted by the positioning tool 21 so that the drill rod of the magnetic drill 13 and the positioning rod 15 are located on the same axis, and then the positioning rod 15 is taken out.

[0048] In a specific embodiment, the diameter of the second hollow drill bit 27 is 16 mm smaller than the diameter of the positioning rod 15, and the diameter of the third hollow drill bit is 8 mm smaller than the diameter of the positioning rod 15. The middle core rod of the broken wire is taken out twice, and a second coring correction can be performed if the coring is deviated once, thereby ensuring that the hole forming accuracy is controlled to the greatest extent, and only part of the external thread 30 remains in the bolt hole.

[0049] In a specific embodiment, the positioning rod 15 includes a front middle cylinder 18, a front cone 17 fixed at the front end of the middle cylinder 18, and a tail thin rod 19 fixed at the rear end of the middle cylinder 18. The tail thin rod 19 is fixed on the magnetic base drill 13 through a connecting piece 20.

[0050] In a specific embodiment, it also includes a positioning tool 21 for fixing the magnetic drill 13 to the cutter head flange ring 4, and the positioning tool 21 includes: A rectangular steel plate 22 fixedly mounted on the blade flange ring 4, wherein the thickness of the rectangular steel plate 22 is 2 cm; Two right-angled trapezoidal steel plates 23 fixed on the rectangular steel plate 22, the thickness of the right-angled trapezoidal steel plates 23 is 2 cm, the two right-angled trapezoidal steel plates 23 are respectively located on both sides of the rectangular steel plate 22, and the cross section is H-shaped; The rectangular steel plate 22 and the two right-angle trapezoidal steel plates 23 are both provided with adjustable bolts 25 , and the adjustable bolts 25 fix the magnetic drill 13 on the positioning fixture 21 .

[0051] In a specific implementation, after the broken wire is cut twice, a milling cutter 31 is provided, and the external thread 30 of the broken wire is cut out by the milling cutter 31 .

[0052] In a specific implementation, the step of expanding the bolt hole is as follows: Provide a fourth hollow drill bit and install it on the drill rod of the magnetic drill 13, so that the fourth hollow drill bit expands the first cutter head flange ring through hole to form a second cutter head flange ring through hole, and remove the fourth hollow drill bit after the expansion is completed; Providing a fifth hollow drill bit and installing it on the drill rod of the magnetic drill 13, so that the fifth hollow drill bit expands the first light hole segment to form a second light hole segment, and after the expansion is completed, removing the fifth hollow drill bit; A sixth hollow drill bit is provided and installed on the drill rod of the magnetic drill 13, so that the sixth hollow drill bit expands the screw hole section 11 to form a first screw hole section. After the expansion is completed, the sixth hollow drill bit is removed.

[0053] A grinding wheel is provided and mounted on the drill rod of the magnetic drill 13 so that the grinding wheel can expand the gasket hole 8 .

[0054] In a specific embodiment, the diameter D1 of the second cutter head flange ring through hole after hole expansion is greater than the diameter of the cutter head flange ring through hole 7 before hole expansion, and the diameter D2 of the second light hole segment after hole expansion is greater than the diameter of the light hole segment 10 before hole expansion. And D1 and D2 satisfy the following relationship: D1≥D2+2e, where e is the height of the thread of the new bolt 50, and D2+2e is the inner diameter of the bolt hole after hole expansion.

[0055] In a specific embodiment, the diameter of the fifth hollow drill bit is D1, and the hole expansion depth is h1, where h1 is the length of the newly made bolt reinforcement rod 51 + 5 mm; the diameter of the sixth hollow drill bit is D2, and the hole expansion depth is h2, where h2 is the length of the threaded section of the newly made bolt 50 + 15 mm; the diameter of the grinding wheel is D3, and the hole expansion depth is h3, where h3 is the depth of the gasket hole 8 before expansion.

[0056] In a specific embodiment, before using the sixth hollow drill bit to expand the screw hole section 11, a steel collar centralizer 32 is provided, the inner diameter of the provided steel collar centralizer 32 is adapted to the diameter of the sixth hollow drill bit, and the outer diameter is adapted to the inner diameter of the second light hole section, and the steel collar centralizer 32 is sleeved on the sixth hollow drill bit to achieve positioning of the sixth hollow drill bit.

[0057] In a specific embodiment, the front end steel ring 33 and the rear end steel ring 34 are coaxially fixed at the rear end of the front end steel ring 33 .

[0058] In a specific implementation, when the sixth hollow drill bit is used to expand the hole three times, the concentricity of the second light hole segment and the first screw hole segment is checked, and the specific checking steps are as follows: Process three test steel rods 35 including a first rod portion 36 and a second rod portion 37, so that the first rod portion 36 and the second rod portion 37 are coaxially arranged, the size of the first rod portion 36 is adapted to the size of the second light hole section, the diameter of the second rod portion 37 is adapted to the inner diameter of the first screw hole section, and the lengths of the second rod portions 37 of the three test steel rods 35 are 1 / 3, 2 / 3, and 3 / 3 of the length of the first screw hole section, respectively, and a handle is fixedly provided at the rear end of the first rod portion 36; After the sixth hollow drill bit has expanded its hole to 1 / 3, 2 / 3, and 3 / 3 respectively, the corresponding test steel rod 35 is inserted into the second light hole section and the first screw hole section. When the test steel rod 35 can be inserted, it is determined that the concentricity of the second light hole section and the first screw hole section meets the design requirements and the next step is performed. When the test steel rod 35 cannot be inserted, it is determined that the concentricity does not meet the design requirements and the step is repeated to adjust the first screw hole section.

[0059] More specifically, after the sixth hollow drill bit is used to expand the hole by 1 / 3, the test steel rod 35 whose length of the second rod portion 37 is 1 / 3 of the length of the first screw hole section is inserted into the second light hole section and the first screw hole section. When the test steel rod 35 cannot be inserted, it is determined that the concentricity does not meet the design requirements, and the sixth hollow drill bit is used to continue expanding the hole at 1 / 3 of the first screw hole section. When the test steel rod 35 can be inserted, it is determined that the concentricity meets the design requirements, and the fifth hollow drill bit is used to expand the hole. After the sixth hollow drill bit is used to expand the hole by 2 / 3, the test steel rod 35 whose second rod portion 37 is 2 / 3 of the length of the first screw hole section is inserted into the second light hole section and the first screw hole section. When the test steel rod 35 cannot be inserted, it is determined that the concentricity does not meet the design requirements, and the sixth hollow drill bit is used to continue expanding the hole at 2 / 3 of the first screw hole section. When the test steel rod 35 can be inserted, it is determined that the concentricity meets the design requirements, and the sixth hollow drill bit is used to expand the hole. After using the sixth hollow drill bit to expand the hole 3 / 3, insert the test steel rod 35 whose length of the second rod portion 37 is 3 / 3 of the length of the first screw hole section into the second light hole section and the first screw hole section. When the test steel rod 35 cannot be inserted, it is determined that the concentricity does not meet the design requirements, and the sixth hollow drill bit is used to continue expanding the hole at 3 / 3 of the first bolt hole. When the test steel rod 35 can be inserted, it is determined that the concentricity meets the design requirements, and the next step is performed.

[0060] In a specific embodiment, the total length of the test steel rod 35 is L, the length of the first rod portion 36 is L1, and the diameter is D1; ​​the length of the second rod portion 37 is L2, and the diameter is D2. Wherein L=L1+L2, the relationship between L1 and h1 satisfies: L1=h1+2mm, and the relationship between L2 and h2 satisfies: L2=h2-2mm.

[0061] In a specific embodiment, the specific steps of performing multiple tapping on the expanded bolt hole are as follows: Remove the magnetic drill 13 and install the tapping tool 39 on the cutter head; A first tap, a second tap and a third tap are provided, and the first tap, the second tap and the third tap are sequentially mounted on the tapping tool 39 , and the inner wall of the first screw hole section is tapped by the tapping tool 39 .

[0062] In a specific embodiment, when the first tap is used for tapping, the first tap is retracted once after advancing three threads and the threads are cleaned. During the process, rapeseed oil is continuously dripped into the bolt hole for lubrication and cooling.

[0063] In a specific embodiment, the tapping tool 39 includes: A support frame fixedly mounted on the cutter head flange ring 4; A torque multiplier 38 slidably disposed on the support frame; a first sleeve 40 disposed on the side of the torque multiplier 38, a self-made nut 41 being fixedly installed in the first sleeve 40, a tap 43 being connected to the self-made nut 41, the tap 43 and the bolt hole being located on the same axis, and a person drives the tap 43 to approach the bolt hole by pushing the torque multiplier 38; When tapping, the tap 43 is removed and replaced.

[0064] More specifically, the support frame includes: Three channel steels 45, two of which are located on the same horizontal plane with their notches facing each other, and another channel steel 45 has its notch facing upward and is located below the other two channel steels 45, and the channel steel 45 is No. 14 channel steel; A special-shaped steel plate 46 fixed to the same end of the three channel steels 45, wherein the special-shaped steel plate 46 is fixed to the cutter head flange ring 4; Two angle steels 47 are respectively fixed between the two corresponding channel steels 45 .

[0065] In a preferred embodiment, the upper half of the special-shaped steel plate 46 is a rectangle, and the lower half is an isosceles trapezoid.

[0066] In a specific embodiment, the diameters of the cone heads of the first tap, the second tap and the third tap are larger than the diameter of the rod. When tapping, a positioner 42 is provided and sleeved on the rod, and the positioner 42 is inserted into the bolt hole for fixing. The inner diameter of the positioner 42 matches the rod, and the outer diameter matches the inner diameter of the bolt hole.

[0067] More specifically, Fig. 20 As shown, during tapping, the positioner 42 includes a second sleeve 49 and a circular ring plate 48 disposed at the end of the second sleeve 49, and the length of the second sleeve is 25 mm.

[0068] In a specific embodiment, after the tapping is completed, a test bolt 45 having the same size as the newly manufactured bolt 50 is provided, and the test bolt 45 is inserted into the bolt hole to check the bolt hole. When the bolt hole matches the test bolt 45, the next step is performed. When they do not match, the second tap and the third tap are reused for tapping.

[0069] Specifically, the test bolt 45 is the newly manufactured bolt 50 .

[0070] In a specific embodiment, the steps for installing the newly made bolt 50 are as follows: Applying a pre-tightening force, providing a hydraulic torque wrench, and using the hydraulic torque wrench to apply a pre-tightening force to the newly manufactured bolt 50, wherein the applied pre-tightening force is 80% of the designed pre-tightening force; After applying pre-tightening force to the plurality of newly manufactured bolts 50 , re-using the hydraulic torque wrench to apply torque to the newly manufactured bolts 50 until the torque reaches 100% of the designed pre-tightening force; Then rotate the cutter head flange ring 4 to check the newly made bolts 50, and re-tighten them if they are loose; Then, a bolt anti-loosening sleeve 52 is provided and installed on the nut of the newly made bolt 50 to prevent the newly made bolt 50 from loosening.

[0071] Specifically, the bolt anti-loosening sleeve 52 includes: a seamless circular steel tube 28 and an inner-chord steel plate 29 arranged on the inner wall of the seamless circular steel tube 28, and the inner-chord steel plate 29 forms a hexagon that is compatible with the nut of the new bolt 50. By putting the bolt anti-loosening sleeve 52 on the nut of the new bolt 50, foreign objects can be prevented from hitting the nut, thereby protecting the integrity of the nut and facilitating the subsequent tightening of the new bolt 50.

[0072] The present invention is described in detail above in conjunction with the embodiments of the accompanying drawings. A person skilled in the art can make various variations of the present invention according to the above description. Therefore, certain details in the embodiments should not constitute a limitation of the present invention, and the scope of protection of the present invention shall be defined by the scope of the attached claims.

Claims

1. A method for repairing the broken connecting bolts between the cutter head and the main drive of a shield machine during the construction stage, characterized in that: The specific steps include: S1: providing a magnetic drill (13) and a positioning tool (21), assembling the positioning tool (21) and the magnetic drill (13) and installing them on the cutter head flange ring (4) of the cutter head, adjusting the position of the drill rod of the magnetic drill (13) by adjusting the positioning tool (21), and cutting out the broken wire of the connecting bolt (5) by the magnetic drill (13); S2: determining whether the internal thread in the bolt hole is damaged, and when the internal thread is not damaged, providing a new connecting bolt (5), and installing the connecting bolt (5) into the bolt hole; When the internal thread is damaged, the bolt hole is enlarged by the magnetic drill (13); S3: After the hole enlargement is completed, a tapping tool (39) is provided, and the tapping tool (39) is used to perform multiple tapping operations on the enlarged bolt hole to form a new bolt hole; S4: making a new bolt (50), and screwing the new bolt (50) into a new bolt hole.

2. The method for repairing the broken connecting bolts between the cutter head and the main drive of a shield machine during the construction phase according to claim 1 is characterized in that: The specific steps of cutting and removing the broken wire by the magnetic drill (13) are as follows: A first hollow drill bit (14) is provided and mounted on the drill rod of the magnetic drill (13); the first hollow drill bit (14) is inserted into the bolt hole to expand the cutter head flange ring through hole (7) on the cutter head flange ring (3) and the light hole section (10) on the main drive (6) to form a first cutter head flange ring through hole on the cutter head flange ring (3) and a first light hole section on the main drive (6); and the first hollow drill bit (14) is removed after the expansion is completed; Providing a second hollow drill bit (27), installing the second hollow drill bit (27) on the drill rod of the magnetic drill (13), allowing the second hollow drill bit (27) to pass through the first cutter head flange ring through hole of the bolt hole and the first light hole section and extend into the screw hole section (11) of the bolt hole to cut the broken wire, and removing the second hollow drill bit (27) after the cutting is completed; A third hollow drill bit is provided, wherein the diameter of the third hollow drill bit is larger than the diameter of the second hollow drill bit (27) and is adapted to the inner diameter of the bolt hole. The third hollow drill bit is mounted on the drill rod of the magnetic drill (13) so that the third hollow drill bit extends into the screw hole section (13) of the bolt hole to further cut the broken wire. After the cutting is completed, the third hollow drill bit is removed.

3. The method for repairing the broken connecting bolts between the cutter head and the main drive of a shield machine during construction according to claim 2 is characterized in that: Before using the first hollow drill bit (14) for cutting, a positioning rod (15) is provided and the positioning rod (15) is inserted into the bolt hole. The position of the magnetic drill (13) is adjusted by the positioning tool (21) so that the drill rod of the magnetic drill (13) and the positioning rod (15) are located on the same axis, and then the positioning rod (15) is removed.

4. The method for repairing the broken connecting bolts between the cutter head and the main drive of a shield machine during the construction phase according to claim 3 is characterized by: After the broken wire is cut twice, a milling cutter (31) is provided, and the external thread (30) of the broken wire is cut out by the milling cutter (31).

5. The method for repairing the broken connecting bolts between the cutter head and the main drive of a shield machine during the construction phase according to claim 1 is characterized in that: The steps of expanding the bolt hole are as follows: Providing a fourth hollow drill bit and installing it on the drill rod of the magnetic drill (13), so that the fourth hollow drill bit expands the first cutter head flange ring through hole to form a second cutter head flange ring through hole, and after the expansion is completed, removing the fourth hollow drill bit; Providing a fifth hollow drill bit and installing it on the drill rod of the magnetic drill (13), so that the fifth hollow drill bit expands the first light hole segment to form a second light hole segment, and after the expansion is completed, removing the fifth hollow drill bit; A sixth hollow drill bit is provided and mounted on the drill rod of the magnetic drill (13), so that the sixth hollow drill bit expands the screw hole section (11) three times to form a first screw hole section, and the expansion lengths of the three times are 1 / 3, 2 / 3, and 3 / 3 of the length of the first screw hole section respectively. After the expansion is completed, the sixth hollow drill bit is removed.

6. The method for repairing the broken connecting bolts between the cutter head and the main drive of a shield machine during the construction phase according to claim 5 is characterized by: Before using the sixth hollow drill bit to expand the screw hole section (11), a steel collar centralizer (32) is provided. The inner diameter of the provided steel collar centralizer (32) is adapted to the diameter of the sixth hollow drill bit, and the outer diameter is adapted to the inner diameter of the second light hole section. The steel collar centralizer (32) is sleeved on the sixth hollow drill bit to achieve positioning of the sixth hollow drill rod.

7. The method for repairing the broken connecting bolts between the cutter head and the main drive of a shield machine during construction according to claim 5, characterized in that: When the sixth hollow drill bit is used to expand the hole three times, the concentricity of the second light hole section and the first screw hole section is checked, and the specific checking steps are as follows: Processing three test steel rods (35) including a first rod portion (36) and a second rod portion (37), wherein the first rod portion (36) and the second rod portion (37) are coaxially arranged, the size of the first rod portion (36) is adapted to the size of the second light hole section, the diameter of the second rod portion (37) is adapted to the inner diameter of the first screw hole section, and the lengths of the second rod portions (37) of the three test steel rods (35) are 1 / 3, 2 / 3, and 3 / 3 of the length of the first screw hole section, respectively, and a handle is fixedly provided at the rear end of the first rod portion (36); After the sixth hollow drill bit has expanded the hole to 1 / 3, 2 / 3, and 3 / 3 respectively, the corresponding test steel rod (35) is inserted into the second light hole section and the first screw hole section. When the test steel rod (35) can be inserted, it is determined that the concentricity of the second light hole section and the first screw hole section meets the design requirements and the next step is performed. When the test steel rod (35) cannot be inserted, it is determined that the concentricity does not meet the design requirements and the step is repeated to adjust the first screw hole section.

8. A method for repairing the broken connecting bolts between the cutter head and the main drive of a shield machine during construction according to claim 1, characterized in that: The specific steps of multiple tapping of the bolt hole after expansion are as follows: Remove the magnetic drill (13) and install the tapping tool (39) on the cutter head; A first tap, a second tap and a third tap are provided, the first tap, the second tap and the third tap are sequentially mounted on the tapping tool (39), and the inner wall of the first screw hole section is tapped by the tapping tool (39).

9. A method for repairing the broken cutter head and main drive bolts of a shield machine during construction according to claim 8, characterized in that: The diameters of the cone heads of the first tap, the second tap and the third tap are larger than the diameter of the rod. When performing tapping, a positioner (42) is provided and sleeved on the rod, and the positioner (42) is inserted into the bolt hole for fixing. The inner diameter of the positioner (42) is matched with the rod portion, and the outer diameter is matched with the inner diameter of the bolt hole.

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