Method for repairing a threaded hole of a shield body

Abstract

The application discloses a shield body threaded hole repairing method, which comprises the following steps: interference threaded hole marking: a plurality of shield body blocks are assembled into a circle and assembled with a main drive or an adapter tool, threaded holes interfering with through holes are found out and marked as interference threaded holes; through hole center marking: plugs are installed in the interference threaded holes, and the center O of the through hole corresponding to the plug is punched by a sample punching device; center coordinate recording: the shield body blocks are installed and positioned on a machining device to record the center coordinates of the center O, and then the plugs are taken out; repairing and machining installation: the interference threaded holes are reamed according to the center coordinates to form installation bottom holes, and threaded sleeves with original threaded holes of the shield body blocks are fixed in the installation bottom holes again. The method has the advantages of high repairing efficiency, low labor intensity of repairing operation, low error accumulation risk and the problems of large surfacing quantity, long shield body block assembling time and low overall machining efficiency in the prior art repairing process are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of machining and assembling a tunnel boring machine shield, and in particular to a method for repairing threaded holes in a shield. Background Art

[0002] The shield body is the main component of the shield machine and is usually divided into several shield blocks 11 according to the excavation diameter. Its function is to provide sufficient strength and rigidity to support various loads and stresses of the shield machine during the excavation process. The threaded holes 12 on it are connected to the through holes on the main drive 13 through long screws 15 to ensure the stability and rigidity of the main drive 13. The inner circular sealing ring 16 of the shield body cooperates with the main drive 13 to ensure the overall sealing. Figure 1 To ensure smooth assembly of the shield body segments and the main drive 13 at the construction site, the threaded hole 12 and the inner circle sealing ring 16 have high coaxiality and position requirements.

[0003] Some remanufacturing projects have been in use for a long time and in harsh environments. At the same time, welding deformation will occur when replacing the rusted inner circle sealing ring 16. These factors cause the threaded hole 12 and the through hole on the main drive 13 to be misaligned after the shield body is assembled into a circle, and the long screw 15 to interfere with the assembly. The same situation may also occur in some new machines due to insufficient machine tool precision and unreasonable process design.

[0004] Because the offset data for the threaded holes 12 on each shield segment 11 is irregular, repairing the individual segments by searching for holes in the individual segments carries the risk of cumulative errors, and repeatedly reassembling the segments is time-consuming. For example, using an 8.8-meter-diameter earth pressure shield, the existing repair solution involves welding several M60 threaded holes 230 mm deep to ensure they are free of defects. The four shield segments 11 are then reassembled and re-drilled and re-tapped on a dedicated machine. This results in a lengthy, challenging, and inefficient repair. Summary of the Invention

[0005] The present invention provides a shield threaded hole repair method to solve the technical problems of the existing repair method, such as the risk of error accumulation by using a single block to find a hole, the time-consuming process of repeatedly rounding the blocks, or the use of surfacing welding to fill the holes and then rounding the whole block and drilling and tapping on a special machine, which leads to a long repair time, great difficulty and low repair efficiency.

[0006] The technical solution adopted in the present invention is as follows:

[0007] A shield body threaded hole repair method is used to repair the deformation and dislocation of the threaded holes set inwardly on the end face of the shield body, comprising the following steps: interference threaded hole marking: several shield body blocks are assembled into a circle and assembled with a main drive or an adapter tooling that replaces the main drive to find the threaded holes that interfere with the through holes on the main drive or the through holes on the adapter tooling, and mark them as interference threaded holes; through hole center marking: a plug for marking the center position of the corresponding through hole is installed in each interference threaded hole, and the center O of the corresponding through hole is punched out on the plug by a sample punching device; center coordinate recording: the shield body blocks are installed and positioned on the processing equipment to record the center coordinate of the center O and then the plug is removed; repair processing and installation: the interference threaded hole is expanded according to the center coordinate to form a mounting bottom hole, and a threaded sleeve with the original threaded hole on the shield body block is re-fixed in the mounting bottom hole.

[0008] Furthermore, in the step of "interference threaded hole marking", the adapter tooling includes a hollow annular adapter ring; the end face of the adapter ring is provided with a pin hole that vertically penetrates the end face for positioning, a plurality of through holes that are arranged in sequence along the circumference and vertically penetrate the end face, and a plurality of lifting holes that are arranged in sequence along the circumference and vertically penetrate the end face for lifting.

[0009] Furthermore, the adapter tooling also includes a plurality of positioning blocks for positioning the shield body segments, and the plurality of positioning blocks are connected to the end face of the adapter ring in sequence along the circumferential direction; each positioning block extends to the bottom of the inner circle sealing ring on the corresponding shield body segment, and the inner wall surface of the positioning block for fitting with the inner circle sealing ring is an arc surface that matches the outer ring surface of the inner ring sealing ring.

[0010] Furthermore, in the step "marking the center of the through hole", the plug is cylindrical; the outer diameter of the outer cylindrical surface of the plug is larger than the inner diameter of the interfering threaded hole, so that the plug can be installed in the interfering threaded hole with interference; the outer cylindrical surface of the front section of the plug is processed to form a conical surface, so that the plug can be smoothly inserted into the interfering threaded hole; an eccentrically set and concave connecting hole is also processed on the rear end face of the plug, which is used to pull the plug out of the interfering threaded hole after being connected to the pin puller.

[0011] Furthermore, in the step of "marking the center of the through hole", the sample punching equipment includes a punch for punching, and the punch includes an inner rod and an outer rod connected in sequence along the axial direction; the inner rod is used to be inserted into the through hole, and the front end of the inner rod is processed to form a punch tip for punching out the center O on the plug, and the punch tip is quenched and hardened; the outer rod is located outside the through hole for connection to the main body of the sample punching equipment.

[0012] Furthermore, the step of "marking the center of the through hole" specifically includes the following steps: passing the plug through the through hole and installing it into the interference threaded hole; installing the punch into the through hole and connecting the main body of the sample punching equipment with an external rod to punch out the center O of the through hole on the plug.

[0013] Furthermore, the step of "recording the center coordinates of the circle" specifically includes the following steps: separating the shield body blocks from the main drive or adapter tooling; installing and positioning a single shield body block on the processing machine tool, and recording the center coordinates O (x, y) of the circle center O; connecting the pin puller to the plug and pulling the plug out of the interfering threaded hole.

[0014] Furthermore, in the step of "repair processing and installation", the threaded sleeve is a hollow tube; the installation bottom hole is a threaded hole, and a fixed external thread connected to the installation bottom hole thread is processed on the outer circular surface of the threaded sleeve, and a connecting internal thread with the same size as the external thread is processed on the inner hole wall of the threaded sleeve.

[0015] Furthermore, the outer end of the threaded sleeve is processed to form a tapered groove, and an inward-concave groove is also provided on the end face of the outer end of the threaded sleeve; in the step of "repair processing and installation", the threaded sleeve is also installed through an installation tool, and the installation tool includes a screw plate for inserting into the groove of the threaded sleeve, and a force handle connected to the screw plate.

[0016] Furthermore, the step of "repair processing and installation" specifically includes the following steps: according to the center coordinate O(x, y), the interference threaded hole is expanded to form a mounting bottom hole; a threaded sleeve is made; the installation tool is connected to the threaded sleeve, and after applying thread glue on the outer wall surface of the threaded sleeve, the installation tool is rotated to fix the threaded sleeve into the mounting bottom hole; the groove and the card groove at the end of the threaded sleeve are filled and welded, and the part of the threaded sleeve extending out of the end face of the shield block is removed by grinding and polishing.

[0017] The present invention has the following beneficial effects:

[0018] When the repair method of the present invention is used to repair the deformed and misplaced threaded holes on the shield body blocks, since several shield body blocks are first put together into a circle and then all the interfering threaded holes are found at the same time, and then the interfering threaded holes on each shield body block are repaired one by one, compared with the repair method of using a single block to find a hole in the prior art, it does not need to repeatedly put the blocks together into a circle, so the repair efficiency is high, the labor intensity of the repair operation is low, and the risk of error accumulation is low; compared with the existing special machine drilling and tapping after filling with surfacing welding and then putting the whole into a circle, the repair method of the present invention is to first use the tool adaptation positioning and then mark the center position of the through hole, and then boring and milling in blocks, and finally inserting the threaded sleeve for repair. The hole position only requires boring and milling of a single block, and no surfacing welding is required. Therefore, the repair time is short, the repair efficiency is high, and the repair difficulty is low. It effectively solves the problems of large amount of surfacing welding, long time for shield block rounding, and low overall processing efficiency in the existing repair process. Through the setting of the plug and the sample punching equipment, the center of the interference threaded hole can be quickly located, and the interference threaded hole of a single shield block can be quickly repaired, which shortens the processing cycle and reduces the production cost. On the other hand, the threaded sleeve is processed to replace the defective interference threaded hole on the shield block, which has the effect of reducing scrap loss, shortening the production cycle, and ensuring product quality. In addition, the entire repair operation is simple and the labor intensity is low.

[0019] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 It is a schematic diagram of the connection between the shield and the main drive;

[0022] Figure 2 This is a schematic diagram of the main structure of the plug;

[0023] Figure 3 This is a schematic diagram of the right side structure of the plug;

[0024] Figure 4 It is a schematic diagram of the main structure of the punch;

[0025] Figure 5 It is a schematic diagram of the main structure of the adaptation tooling;

[0026] Figure 6 yes Figure 5 AA-axis cross-sectional structural diagram;

[0027] Figure 7 yes Figure 5Schematic diagram of the cross-sectional structure in the middle BB direction;

[0028] Figure 8 It is a schematic diagram of the cross-sectional main structure of the threaded casing;

[0029] Figure 9 yes Figure 8 Schematic diagram of the structure viewed from above;

[0030] Figure 10 It is a schematic diagram of the main structure of the installation tooling;

[0031] Figure 11 It is a schematic diagram of the connection between the shield body and the adapter tooling.

[0032] Legend:

[0033] 11. Shield body blocks; 12. Threaded holes; 13. Main drive; 15. Long screw; 16. Inner sealing ring;

[0034] 2. Plug; 201. Outer cylindrical surface; 202. Conical surface; 203. Connecting hole;

[0035] 3. Punch; 31. Inner extension rod; 32. Outer extension rod; 33. Punch tip;

[0036] 4. Adapter tool; 41. Adapter ring; 411. Pin hole; 412. Lifting hole; 42. Positioning block;

[0037] 5. Threaded casing; 501. Fixed external thread; 502. Connecting internal thread; 503. Bevel; 504. Slot;

[0038] 6. Install the tooling; 61. Tighten the plate; 62. Apply force handle. DETAILED DESCRIPTION

[0039] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0040] Reference Figure 1 、 Figure 11 The preferred embodiment of the present invention provides a shield threaded hole repair method for repairing the deformation and dislocation of the threaded hole 12 set inwardly on the end face of the shield, comprising the following steps:

[0041] S10: Marking of interference threaded holes: several shield body blocks 11 are assembled into a circle and assembled with the main drive 13 or the adapter 4 that replaces the main drive 13 to find the threaded holes 12 that interfere with the through holes on the main drive 13 or the through holes on the adapter 4, and mark them as interference threaded holes.

[0042] S20: Marking the center of the through hole: inserting a plug 2 for marking the center position of the corresponding through hole into each interfering threaded hole, and punching out the center O of the corresponding through hole on the plug 2 by a sample punching device.

[0043] S30: Recording the center coordinates: After the shield body segment 11 is mounted and positioned on the processing equipment to record the center coordinates of the circle O, the plug 2 is removed.

[0044] S40: Repair processing and installation: the interference threaded hole is expanded according to the center coordinate to form a mounting bottom hole, and the threaded sleeve 5 with the original threaded hole on the shield body block 11 is re-fixed in the mounting bottom hole.

[0045] When the repair method of the present invention is used to repair the deformed and misplaced threaded holes 12 on the shield body blocks 11, since several shield body blocks 11 are first put together to form a circle and then all the interfering threaded holes are found at the same time, and then the interfering threaded holes on each shield body block 11 are repaired one by one, compared with the repair method of using a single block to find a hole in the prior art, it does not need to repeatedly put the blocks together to form a circle, so the repair efficiency is high, the labor intensity of the repair operation is low, and the risk of error accumulation is low; compared with the existing special machine drilling and tapping after filling with surfacing welding and then putting the whole into a circle, the repair method of the present invention is to first use the tool adaptation positioning and then mark the center position of the through hole, and then boring and milling in blocks, and finally inlaying the threaded sleeve 5 To repair the hole position, only a single block needs to be bored and milled separately, and no surfacing welding is required. Therefore, the repair time is short, the repair efficiency is high, and the repair difficulty is low. It effectively solves the problems of large amount of surfacing welding, long time for shield body block rounding, and low overall processing efficiency in the existing repair process. Through the setting of the plug 2 and the sample punching equipment, the center of the interference threaded hole can be quickly located, and the interference threaded hole of a single shield body block 11 can be quickly repaired, shortening the processing cycle and reducing production costs. On the other hand, the threaded sleeve 5 is processed to replace the defective interference threaded hole on the shield body block 11, which has the effects of reducing scrap loss, shortening the production cycle, and ensuring product quality. In addition, the entire repair operation is simple and the labor intensity is low.

[0046] Alternatively, as Figure 5-7 As shown, in step "S10: Interference Threaded Hole Marking," the adapter tooling 4 includes a hollow, annular adapter ring 41. The end surface of the adapter ring 41 is provided with a pin hole 411 that vertically penetrates the end surface for positioning, a plurality of through holes that are spaced apart circumferentially and vertically penetrate the end surface, and a plurality of lifting holes 412 that are spaced apart circumferentially and vertically penetrate the end surface for lifting. The lifting holes 412 are threaded holes used to connect to lifting equipment to facilitate lifting the adapter tooling 4. During positioning, after inserting a positioning pin through the pin hole 411 on the adapter ring 41 and the corresponding pin hole on the shield body segment 11, a shield body segment 11 can be positioned with the adapter tooling 4.

[0047] Preferably, if Figure 5-7 and Figure 11 As shown, the adapter tooling 4 also includes a plurality of positioning blocks 42 for positioning the shield body segment 11. The plurality of positioning blocks 42 are connected to the end face of the adapter ring 41 at intervals along the circumferential direction. Each positioning block 42 extends below the inner circular sealing ring 16 of the corresponding shield body segment 11. The inner wall surface of the positioning block 42, which is used to mate with the inner circular sealing ring 16, is an arc surface that matches the outer annular surface of the inner circular sealing ring. Therefore, through the cooperation between the inner circular sealing ring 16 of the shield body segment 11 and the positioning blocks 42 at the corresponding positions, the shield body segment 11 is quickly positioned relative to the adapter ring 41, thereby improving positioning efficiency and accuracy.

[0048] In this optional solution, the specific operation of step "S10: interference threaded hole marking" is: first, several shield body blocks 11 are assembled into a circle, and then assembled with the main drive 13 or the through holes on the adapter 4 using a long screw 15, and the threaded holes 12 in the through holes and threaded holes 12 where there is interference in the assembly are marked as interference threaded holes.

[0049] Alternatively, as Figure 2-3 As shown, in step "S20: Marking the center of the through hole", the plug 2 is cylindrical. The outer diameter of the outer cylindrical surface 201 of the plug 2 is larger than the inner diameter of the interfering threaded hole, so that the plug 2 can be installed in the interfering threaded hole with interference; in actual design, the outer diameter of the outer cylindrical surface 201 is about 50 threads larger than the bottom diameter of the interfering threaded hole. The outer cylindrical surface 201 of the front section of the plug 2 is processed to form a conical surface 202, so that the plug 2 can be smoothly inserted into the interfering threaded hole. An eccentrically arranged and concave connecting hole 203 is also processed on the rear end face of the plug 2, which is used to pull the plug 2 out of the interfering threaded hole after connecting to the pin puller, and the eccentric setting of the connecting hole 203 is also used to avoid interference with the center of the through hole.

[0050] Alternatively, as Figure 4 As shown, in step "S20: Marking the center of the through hole", the sample punching device includes a punch 3 for punching, and the punch 3 includes an inner rod 31 and an outer rod 32 connected in sequence along the axial direction. The inner rod 31 is used to be inserted into the through hole, and the front end of the inner rod 31 is processed to form a punch tip 33 for punching out the center O on the plug 2, and the punch tip 33 is quenched and hardened to punch out the correct hole position on the plug 2, thereby improving the accuracy of the hole punching and the difficulty of punching. The outer rod 32 is located outside the through hole for connection with the main body of the sample punching device. In this optional solution, by inserting the punch 3 into the through hole, and the outer diameter of the inner rod 31 of the punch 3 is about 15 wires smaller than the inner diameter of the through hole, the punch 3 can accurately punch out the position of the center O of the through hole on the plug 2 under the action of the sample punching device body and the guiding action of the through hole, thereby improving the punching accuracy and the reliability of the punching operation.

[0051] Optionally, step “S20: marking the center of the through hole” specifically includes the following steps:

[0052] S201: Pass the plug 2 through the through hole and install it into the interference threaded hole.

[0053] S202: Insert the punch 3 into the through hole and connect the external rod 32 to the main body of the sample punching device to punch out the center O of the through hole on the plug 2; specifically, adapt the punch 3 to the through hole on the main drive 13 or the adapter tool 4, and then connect the external rod 32 of the punch 3 to the main body of the sample punching device (the external rod 32 can also be directly hammered) to punch out the center O of the through hole on the plug 2.

[0054] Optionally, step “S30: recording the center coordinates” specifically includes the following steps:

[0055] S301: Separate the shield body block 11 and the main drive 13 or the adapter 4.

[0056] S302: Install and position a single shield body block 11 on a processing machine tool, and record the center coordinates O(x, y) of the circle center O; specifically, first, after the single shield body block 11 is rotated on a boring and milling machine to align the machine surface, the machine tool then records the center coordinates O(x, y) of the circle center O punched out in the previous process.

[0057] S303: After connecting the pin puller to the plug 2, the plug 2 is pulled out from the interfering threaded hole. That is, the pin puller is connected to the connecting hole 203 on the plug 2, and then the plug 2 is pulled out of the interfering threaded hole.

[0058] Alternatively, as Figure 8-9 As shown, in step "S40: Repair, Processing, and Installation," the threaded sleeve 5 is hollow and tubular. The mounting bottom hole is a threaded hole. The outer circumferential surface 201 of the threaded sleeve 5 is machined with a fixed external thread 501 that is threadedly connected to the mounting bottom hole. The inner wall of the threaded sleeve 5 is machined with a connecting internal thread 502 of the same size as the external thread of the threaded hole 12.

[0059] Preferably, if Figure 8-10 As shown, the outer end of the threaded sleeve 5 is machined to form a tapered groove 503, and a concave retaining groove 504 is also provided on the outer end surface of the threaded sleeve 5. The groove 503 is used for subsequent surfacing welding to facilitate welding and fixing to the shield body segment 11, and the retaining groove 504 is used to force the threaded sleeve 5 into the mounting bottom hole using an external tool. During the "repair processing and installation" step, the threaded sleeve 5 is also installed using the installation tool 6. The installation tool 6 includes a screw plate 61 for inserting into the retaining groove 504 of the threaded sleeve 5 and a force-applying handle 62 connected to the screw plate 61.

[0060] Optionally, step “S40: repair processing and installation” specifically includes the following steps:

[0061] S401: According to the center coordinates O(x, y), the interfering threaded hole is expanded to form a mounting bottom hole; specifically, according to the center coordinates O(x, y), the original M60 threaded hole 12 is expanded to form a Φ83.5 bottom hole, and then an integral thread milling cutter is used to mill a fixed internal thread M90*5.5 mounting bottom hole.

[0062] S402: Make a threaded sleeve 5; the fixed external thread 501 of the threaded sleeve 5 matches the processed fixed internal thread M90*5.5, the connecting internal thread 502 of the threaded sleeve 5 is the same as the thread of the original M60 threaded hole 12 before repair, and the end of the threaded sleeve 5 is provided with a groove 504 and an outer circle C3 groove 503.

[0063] S403: Connect the installation tool 6 to the threaded sleeve 5, and after applying thread glue on the outer wall surface of the threaded sleeve 5, rotate the installation tool 6 to fix the threaded sleeve 5 into the installation bottom hole; specifically, match the screw plate 61 of the installation tool 6 with the card groove 504 of the threaded sleeve 5, and apply thread glue on the fixed external thread 501, and tighten the threaded sleeve 5 into the hole with the fixed internal thread M90*5.5 by pulling the force handle 62.

[0064] S404: Fill and weld the groove 503 and the groove 504 at the end of the threaded sleeve 5, and grind and polish to remove the portion of the threaded sleeve 5 extending out of the end face of the shield body block 11; specifically, after the threaded sleeve 5 is installed, fill the gap between the groove 503 and the inner wall of the installation bottom hole and the groove 504, then weld to fix the threaded sleeve 5 to the installation bottom hole, flatten the groove 504, and finally grind and polish to remove the portion of the threaded sleeve 5 extending out of the end face of the shield body block 11 to achieve a smooth and flat surface.

[0065] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A shield thread hole repair method, characterized in that: The method is used to repair the deformation and dislocation of the threaded hole (12) provided in a concave manner on the end surface of the shield body, comprising the following steps: Interference threaded hole marking: several shield body blocks (11) are assembled into a circle and assembled with the main drive (13) or the adapter (4) that replaces the main drive (13) to find the threaded holes (12) that interfere with the through holes on the main drive (13) or the through holes on the adapter (4), and mark them as interference threaded holes; Marking the center of the through hole: inserting a plug (2) for marking the center position of the corresponding through hole into each interfering threaded hole, and punching out the center O of the corresponding through hole on the plug (2) by a sample punching device; Recording the center coordinates: installing and positioning the shield body block (11) on the processing equipment to record the center coordinates of the circle center O and then removing the plug (2); specifically comprising the following steps: Separate the shield body block (11) from the main drive (13) or the adapter tool (4); install and position the single shield body block (11) on the processing machine tool, and record the center coordinates O (x, y) of the circle center O; connect the pin puller to the plug (2) and pull the plug (2) out of the interfering threaded hole; Repair processing and installation: according to the coordinates of the center of the circle, the interference threaded hole is expanded to form a mounting bottom hole, and the threaded sleeve (5) with the original threaded hole on the shield body block (11) is re-fixed in the mounting bottom hole; wherein, the threaded sleeve (5) is a hollow tube, the outer end of the threaded sleeve (5) is processed to form a tapered groove (503), and the end surface of the outer end of the threaded sleeve (5) is also provided with an inwardly concave groove (504), and the threaded sleeve (5) is also installed through the installation tool (6); the step of "repair processing and installation" specifically includes the following steps: According to the center coordinates O(x, y), the interference threaded hole is expanded to form a mounting bottom hole; a threaded sleeve (5) is made; a mounting tool (6) is connected to the threaded sleeve (5), and after applying thread glue on the outer wall surface of the threaded sleeve (5), the mounting tool (6) is rotated to fix the threaded sleeve (5) into the mounting bottom hole; the groove (503) and the clamping groove (504) at the end of the threaded sleeve (5) are filled and welded, and the portion of the threaded sleeve (5) extending out of the end surface of the shield body block (11) is removed by grinding and polishing.

2. The shield thread hole repair method according to claim 1, characterized in that: In the step of "interference threaded hole marking", the adaptor (4) includes a hollow annular adaptor ring (41); The end face of the adapter ring (41) is provided with a pin hole (411) vertically penetrating the end face for positioning, a plurality of through holes spaced in sequence along the circumference and vertically penetrating the end face, and a plurality of hoisting holes (412) spaced in sequence along the circumference and vertically penetrating the end face for hoisting.

3. The shield thread hole repair method according to claim 2, characterized in that: The adapting tool (4) further comprises a plurality of positioning blocks (42) for positioning the shield body segments (11), wherein the plurality of positioning blocks (42) are sequentially connected to the end surface of the adapting ring (41) at intervals along the circumferential direction; Each positioning block (42) extends to the bottom of the inner circle sealing ring (16) on the corresponding shield body block (11), and the inner wall surface of the positioning block (42) for fitting with the inner circle sealing ring (16) is an arc surface matching the outer ring surface of the inner ring sealing ring.

4. The shield thread hole repair method according to claim 1, characterized in that: In the step "marking the center of the through hole", the plug (2) is cylindrical; The outer diameter of the outer circular surface (201) of the plug (2) is larger than the inner diameter of the interfering threaded hole, so that the plug (2) is interference-fitted into the interfering threaded hole; The outer cylindrical surface (201) of the front section of the plug (2) is processed to form a conical surface (202) so that the plug (2) can be smoothly punched into the interfering threaded hole; An eccentrically arranged and inwardly concave connecting hole (203) is also processed on the rear end surface of the plug (2) for pulling the plug (2) out of the interfering threaded hole after being connected to a pin puller.

5. The shield thread hole repair method according to claim 1, characterized in that: In the step of "marking the center of the through hole", the sample punching device includes a punch (3) for punching, and the punch (3) includes an inner extension rod (31) and an outer extension rod (32) connected in sequence along the axial direction; The inner extension rod (31) is used to be inserted into the through hole, and the front end of the inner extension rod (31) is processed to form a punch tip (33) for punching out a circle center O on the plug (2), and the punch tip (33) is quenched and hardened; The external connecting rod (32) is located outside the through hole and is used to be connected to the main body of the sample punching device.

6. The shield thread hole repair method according to claim 5, characterized in that: The step of "marking the center of the through hole" specifically includes the following steps: Pass the plug (2) through the through hole and install it into the interference threaded hole; The punch (3) is installed in the through hole and the external rod (32) is connected to the main body of the sample punching device to punch out the center O of the through hole on the plug (2).

7. The shield thread hole repair method according to claim 1, characterized in that: The mounting bottom hole is a threaded hole, and a fixed external thread (501) threadedly connected to the mounting bottom hole is processed on the outer circumferential surface (201) of the threaded sleeve (5), and a connecting internal thread (502) with the same size as the threaded hole (12) is processed on the inner hole wall surface of the threaded sleeve (5).

8. The shield thread hole repair method according to claim 7, characterized in that: The installation tool (6) comprises a screwing plate (61) for inserting into the clamping groove (504) of the threaded sleeve (5), and a force-applying handle (62) connected to the screwing plate (61).

Images