A repair device and repair method for large diameter steel pipe

Abstract

A large-diameter steel pipe repair device and repair method, relating to a large-diameter steel pipe repair device, comprising a compensation pipe (2), a screw (10), a collar A (7), a collar B (8), a nut (11), a sealing ring A (6) and a sealing ring B (9), and the steps of prefabricating the compensation pipe and required accessories, closing the valve of the large-diameter steel pipe, cutting the large-diameter steel pipe at the damaged part, drilling holes on the large-diameter steel pipe, mixing epoxy resin filler, installing the compensation pipe and accessories, plugging gaps and conducting pressure testing to repair the large-diameter steel pipe. The invention removes the problematic pipeline by cutting, and fixes the two large-diameter steel pipes with two compensation pipes respectively, thereby achieving tensile strength repair of the large-diameter steel pipe.

Description

Technical Field

[0001] The present invention relates to a repair device for a large diameter steel pipe, in particular to a repair device and a repair method for a large diameter steel pipe, specifically the present invention relates to an anti-tensile repair device and a repair method for a large diameter steel pipe. Background Art

[0002] As is known, pipelines are one of the means of transport for gas, liquid and loose solids. There are pipelines on the side of or above some roads, on the side of or above streets, and above factory roads. In order to reduce joints, these pipelines are usually welded by multiple pipelines to form a longer pipeline; these pipelines are supported by pipe seats formed by cement seats, brick seats, steel structure seats or other buildings. Since they are close to the road and are affected by micro-seismicity caused by vehicles passing by and vibration caused by the operation of factory equipment, the pipeline and pipe seat support components are of two types: fixed and movable, so that the pipeline and other components do not produce relative displacement. When multiple pipelines are laid in parallel, the method used is to set the fixed pipe seats of each pipeline on the same beam to form a centralized fixation; in view of the characteristic that some pipelines are on the roadside, the operating transport vehicles forget to put down the cargo box, resulting in scratching the pipeline, the cargo is too high when passing under the pipeline, resulting in collision with the pipeline, and the impact of the pipeline caused by vehicle accidents. For the deformation of the pipeline caused by the above reasons, simple reinforcement treatment can be carried out, and for the pipeline with leakage, it can only be restored to operation by large-scale pipeline replacement. This operation method is time-consuming and seriously affects the operation of the enterprise. Summary of the invention

[0003] In order to overcome the deficiencies in the background technology, the present invention discloses a large-diameter steel pipe repair device and repair method, which removes the problematic pipe by cutting, and fixes two large diameter steel pipes respectively with two compensating pipes to obtain a rapid large-diameter steel pipe anti-tensile repair.

[0004] The technical solution for implementing the present invention is as follows:

[0005] A repair device for a large-diameter steel pipe, the repair device comprises a compensating pipe, a screw, a collar A, a collar B, a nut, a sealing ring A and a sealing ring B, the compensating pipe is provided with the same number of surrounding holes E in the same axial direction near both ends, the inner ends of the matching number of screws are respectively located in the holes E, and elastic supports for the inner ends of the screws are respectively provided in the compensating pipes in the holes E; the collar A has the same structure as the collar B, wherein the inner wall of the reducing ring of the collar A is in clearance with the outer edge of the compensating pipe, an expanding ring is provided on one side of the reducing ring, and a plurality of holes B corresponding to the compensation pipe holes E are provided between the inner wall and the outer edge surface of the expanding ring; both ends of the compensating pipe It is passed through the ends of large-diameter steel pipe A and large-diameter steel pipe B, a sealing ring A is provided between the outer end face of the reducing ring of collar A and the end face of large-diameter steel pipe B, a sealing ring B is provided between the outer end face of the reducing ring of collar B and the end face of large-diameter steel pipe A, the screws near the two ends of the compensation pipe respectively pass through the hole A near the end of large-diameter steel pipe A and the hole C near the end of large-diameter steel pipe B as well as the hole B of the expanding ring of collar A and the hole D of the expanding ring of collar B, and are then locked by nuts respectively, and caulking agents are provided between the inner surface of the expanding ring of collar A and the outer edge of large-diameter steel pipe B and between the inner surface of the expanding ring of collar B and the outer edge of large-diameter steel pipe A respectively.

[0006] The repair device for large-diameter steel pipes is characterized in that the compensating pipe is divided into two sections, and connecting flanges are respectively provided at the joints of the two sections of the compensating pipes. A plurality of connecting screws are passed through the light holes of the two connecting flanges and are fixed by nuts, and annular sealing gaskets are provided on the opposite surfaces of the two connecting flanges; a plurality of spring steel plates are respectively provided on the inner walls of the two compensating pipes, and the outer end of each spring steel plate is fixedly connected to the inner end of the screw, and the inner ends of the plurality of spring steel plates are fixedly connected to the inner walls of the connecting flanges of the two compensating pipes.

[0007] In the repair device for large-diameter steel pipes, the inner ends of multiple spring steel plates are fixed in the grooves arranged on the outer edge surfaces of two support rings, and the two support rings are respectively fixed on the inner walls of the connecting flanges of the two compensation pipes.

[0008] In the repairing device for large-diameter steel pipes, a transition ring is provided between the reducing ring and the expanding ring of the sleeve A, and an annular step is formed on the outer end face of the reducing ring on the inner face of the transition ring.

[0009] The repair device for large-diameter steel pipes has a sealing ring A and a sealing ring B with the same structure. A surrounding annular groove is provided on the outer side of the sealing ring A close to the inner wall, and a pointed piece is provided between the annular groove and the inner wall. The outer edge of the sealing ring A matches the inner wall of the expansion ring, and the inner wall of the sealing ring A matches the outer edge of the compensation tube.

[0010] The repair device for large-diameter steel pipes, wherein the caulking agent is epoxy resin filler.

[0011] The repair method of the large diameter steel pipe repair device comprises the following steps:

[0012] Prefabricate compensation pipes and necessary accessories, close valves of large-diameter steel pipes, cut damaged large-diameter steel pipes, drill holes in large-diameter steel pipes, mix epoxy resin fillers, install compensation pipes and accessories, plug gaps and conduct pressure tests;

[0013] A. Prefabricate the compensation tube and necessary accessories:

[0014] According to the inner diameter of the installed large-diameter steel pipe, a compensation pipe, a collar A, a collar B, a sealing ring A, a sealing ring B, a nut and a connecting screw are manufactured to be inserted into the large-diameter steel pipe;

[0015] B. Close the valve of large diameter steel pipe:

[0016] Completely close the valves in the inlet and outlet directions according to the location of the damaged part of the large-diameter steel pipe;

[0017] C. Cutting the damaged large diameter steel pipe:

[0018] After confirming the damaged part of the large diameter steel pipe, mark the cutting length on the large diameter steel pipe, and then use the cutting equipment to cut the large diameter steel pipe into large diameter steel pipe A and large diameter steel pipe B;

[0019] D. Drilling holes on large diameter steel pipes:

[0020] Punch multiple holes A on the large diameter steel pipe A and multiple holes C on the large diameter steel pipe B according to the position of the compensation pipe close to the screws at both ends, then clean the large diameter steel pipe A and the large diameter steel pipe B to ensure that there are no stains, then use nylon webbing to cover the multiple holes A on the outer edge of the large diameter steel pipe A, and use hot melt to fix the two ends of the nylon webbing; use another nylon webbing to cover the multiple holes C on the outer edge of the large diameter steel pipe B, and use hot melt to fix the two ends of the nylon webbing;

[0021] E. Prepare epoxy resin filler:

[0022] The epoxy resin filler ingredients of epoxy resin + diluent + curing agent are prepared in proportion; then a certain amount of the prepared epoxy resin filler is mixed with asbestos powder to obtain the outer layer filler;

[0023] F. Install compensation pipe and accessories:

[0024] Insert half of the compensation tube into the large diameter steel tube A, and then insert the other half of the compensation tube into the large diameter steel tube B, adjust the sealing ring B to stick to the end of the large diameter steel tube A, and then pull the collar B outward so that the hole D of the collar B expansion ring corresponds to the hole A of the large diameter steel tube A, and then adjust the angle of half of the compensation tube so that the screw of half of the compensation tube is inserted into the hole A of the large diameter steel tube A under the action of the spring steel plate; then adjust the sealing ring A to stick to the end of the large diameter steel tube B, pull the collar A outward so that the hole B of the collar A expansion ring corresponds to the hole C of the large diameter steel tube B, and put the annular sealing gasket on the two connecting methods of the two compensation tubes. Then adjust the angle of the other half of the compensation tube so that the screw of the other half of the compensation tube is inserted into the hole C of the large-diameter steel pipe B under the action of the spring steel plate. After using the connecting screw to penetrate the light holes of the two connecting flanges, use the nut to lock the connecting screw; then use the collar B to pull outwards so that the hole D of the collar B expansion ring is sleeved on the screw of half of the compensation tube. At this time, the sealing ring B is in an extruded state, and the screw is locked with a nut; then use the collar A to pull outwards so that the hole B of the collar A expansion ring is sleeved on the screw of the other half of the compensation tube. At this time, the sealing ring A is in an extruded state, and the screw is locked with a nut;

[0025] G. Fill the gap:

[0026] Soak the glass fiber in epoxy resin filler, use a stick to fill the soaked glass fiber into the gap between the expansion ring of the ferrule B and the large diameter steel pipe A and tamp it; then use a stick to fill the soaked glass fiber into the gap between the expansion ring of the ferrule A and the large diameter steel pipe B and tamp it; use a putty knife to trim the outer layer of filler to the outside of the gap;

[0027] H. Pressure test:

[0028] Open the valve in the direction of incoming liquid, and after confirming that there is no leakage, open the valve in the direction of outgoing liquid.

[0029] In the repair method of the large-diameter steel pipe repair device, all screws are constrained in the hole E of the compensation pipe by using an annular nylon webbing before the compensation pipe is used. When in use, after the two compensation pipes are respectively inserted into the inner holes of the large-diameter steel pipe A and the large-diameter steel pipe B, the annular nylon webbing is removed using a cutter.

[0030] The repair method of the repair device for the large-diameter steel pipe, the epoxy resin filler is according to the weight proportion of epoxy resin + diluent + curing agent = ++ parts; the epoxy resin filler is used to soak the glass fiber rope and the epoxy resin filler is used to soak the glass fiber.

[0031] In the repair method of the repair device for a large-diameter steel pipe, the outer layer filler is epoxy resin filler + asbestos powder = + parts by weight.

[0032] Through the above disclosure, the beneficial effects of the present invention are:

[0033] The large-diameter steel pipe repair device and repair method described in the present invention respectively insert two sections of compensation pipes into large-diameter steel pipe A and large-diameter steel pipe B, and the spring steel plates in the two compensation pipes respectively push out the screws, and use two rings to respectively make two sealing rings to seal the gaps at the connection, and then use epoxy resin filler to seal the gaps around the screws, and the connecting flanges of the two compensation pipes and the annular sealing gaskets therebetween obtain the sealing of the compensation pipes; the construction of this application is simple, and only needs to cut and remove the damaged pipes, and then after drilling, the two large diameter steel pipes are fixedly connected by two compensation pipes to obtain rapid large-diameter steel pipe anti-tensile repair; the present invention is suitable for repairing large-diameter steel pipes with a diameter greater than fifty centimeters. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a process step diagram of the present invention;

[0035] Figure 2 It is a structural schematic diagram of the present invention;

[0036] Figure 3 It is a schematic diagram of the assembly structure of the present invention;

[0037] Figure 4 This is a schematic diagram of the structure of a half compensation tube of the present invention;

[0038] Figure 5 It is a schematic diagram of the three-dimensional structure of the support ring of the present invention;

[0039] Figure 6 It is a schematic diagram of the structure of the spring steel plate of the present invention;

[0040] Figure 7 It is a schematic diagram of a partial three-dimensional structure of a spring steel plate of the present invention;

[0041] Figure 8 It is a schematic diagram of the three-dimensional structure of the sleeve A of the present invention;

[0042] Fig. 9 It is a schematic diagram of the internal three-dimensional structure of the sleeve A of the present invention;

[0043] Fig.10 It is a schematic diagram of the three-dimensional structure of the sealing ring A of the present invention;

[0044] Fig.11 This is a schematic diagram of the annular groove structure of the sealing ring A of the present invention;

[0045] In the figure: 1. Large diameter steel pipe A; 2. Compensating pipe; 3. Spring steel plate; 4. Support ring; 5. Large diameter steel pipe B; 6. Sealing ring A; 7. Ring A; 8. Ring B; 9. Sealing ring B; 10. Screw; 11. Nut; 12. Epoxy resin filler; 13. Connecting screw; 14. Connecting flange; 15. Hole A; 16. Hole B; 17. Hole C; 18. Hole D; 19. Hole E; 20. Slot; 21. Spot welding; 22. Transition ring; 23. Expansion ring; 24. Reduction ring; 25. Annular step; 26. Annular groove; 27. Point piece; 28. Light hole. DETAILED DESCRIPTION

[0046] The present invention is further described below in conjunction with embodiments; the following embodiments are not intended to limit the present invention, but are merely used as a means to support the implementation of the present invention, and any equivalent structural replacement within the technical framework disclosed in the present invention is within the protection scope of the present invention;

[0047] Combined with Figures 2 to 11 The repair device for large-diameter steel pipe described in the invention comprises a compensation tube 2, a screw 10, a collar A7, a collar B8, a nut 11, a sealing ring A6 and a sealing ring B9. The compensation tube 2 is provided with the same number of circumferential holes E19 in the same axial direction near both ends, and the inner ends of the matching number of screws 10 are respectively located in the holes E19. Elastic supports for the inner ends of the screws 10 are respectively provided in the compensation tube 2 in the holes E19. The collar A7 has the same structure as the collar B8. A transition ring 22 is provided between the reducing ring 24 and the expanding ring 23 of the collar A7. An annular step 25 is formed on the outer end face of the reducing ring 24 on the inner face of the transition ring 22. The inner wall of the reducing ring 24 of the collar A7 is clearance-matched with the outer edge of the compensation tube 2. An expanding ring 23 is provided on one side of the reducing ring 24. An elastic support is provided between the inner wall and the outer edge face of the expanding ring 23. A plurality of holes B16 corresponding to the holes E19 of the compensation pipe 2 are arranged in between; the two ends of the compensation pipe 2 are passed through the ends of the large-diameter steel pipe A1 and the ends of the large-diameter steel pipe B5, a sealing ring A6 is arranged between the outer end surface of the reducing ring 24 of the collar A7 and the end of the large-diameter steel pipe B5, a sealing ring B9 is arranged between the outer end surface of the reducing ring of the collar B8 and the end of the large-diameter steel pipe A1, the screws 10 near the two ends of the compensation pipe 2 respectively pass through the hole A15 near the end of the large-diameter steel pipe A1 and the hole C17 near the end of the large-diameter steel pipe B5, as well as the hole B16 of the expanding ring 23 of the collar A7 and the hole D18 of the expanding ring of the collar B8, and are then locked by nuts 11 respectively, and epoxy resin fillers 12 are arranged between the inner surface of the expanding ring 23 of the collar A7 and the outer edge of the large-diameter steel pipe B5 and between the inner surface of the expanding ring of the collar B8 and the outer edge of the large-diameter steel pipe A1.

[0048] Combined with Figure 2 , 3, 4, 5, 6 or 7, the compensation tube 2 is composed of two sections, and connecting flanges 14 are respectively provided at the joints of the two sections of the compensation tube 2. A plurality of connecting screws 13 are passed through the light holes 28 of the two connecting flanges 14 and are fixed by nuts, and annular sealing gaskets are provided on the opposite surfaces of the two connecting flanges 14; a plurality of spring steel plates 3 are respectively provided on the inner walls of the two compensation tubes 2, and the inner ends of the plurality of spring steel plates 3 are fixed in the grooves 20 provided on the outer edge surfaces of the two support rings 4, and the two support rings 4 are respectively welded and fixed to the inner walls of the connecting flanges 14 of the two compensation tubes 2 by spot welding 21, and the outer end of each spring steel plate 3 is fixedly connected to the inner end of the screw 10, and the inner ends of the plurality of spring steel plates 3 are fixedly connected to the inner walls of the connecting flanges 14 of the two compensation tubes 2, and the plurality of spring steel plates 3 form an elastic support for the inner end of the screw 10.

[0049] Combined with Figure 2 , 3 , 10 or 11, the sealing ring A6 has the same structure as the sealing ring B9, a surrounding annular groove 26 is provided on the outer side surface of the sealing ring A6 close to the inner wall, a pointed piece 27 is provided between the annular groove 26 and the inner wall, the outer edge of the sealing ring A6 matches the inner wall of the expansion ring 21, and the inner wall of the sealing ring A6 matches the outer edge of the compensation tube 2.

[0050] The repair method of the large diameter steel pipe repair device is combined with the attached Figure 1 And attached Figures 2 to 11 , the method comprises the following steps:

[0051] Prefabricate the compensation pipe and necessary accessories, close the valve of the large diameter steel pipe, cut the large diameter steel pipe at the damaged part, drill holes on the large diameter steel pipe, mix epoxy resin filler 12, install the compensation pipe and accessories, plug the gap and test the pressure;

[0052] A. Prefabricate the compensation tube and necessary accessories:

[0053] Select the compensation tube 2 according to the inner diameter of the installed large diameter steel pipe. The overall length of the compensation tube 2 is not less than one meter. Divide the compensation tube 2 into two sections from the middle. Punch holes E19 on the two compensation tubes 2 respectively. Take two connecting flanges 14 to punch corresponding light holes 28. Then weld the two connecting flanges 14 and the two compensation tubes 2 firmly to form a whole. Then take two support rings 4 and carve out grooves 20 on the outer edges of the two support rings 4. The middle of the groove 20 corresponds to the hole E19 of the two compensation tubes 2. Connect the middle of one end of the matching number of spring steel plates 3 to the screw 10 by spot welding 21. Then, the other end of the spring steel plate 3 is placed in the slots 20 of the two support rings 4 and then fixed by spot welding, and then the two support rings 4 are respectively welded to the two compensation tubes 2; the sleeve ring A7 and the sleeve ring B8 have the same structure and can be processed by cutting through steel rings of the same thickness, and then the holes "hole B16 and hole D18" are punched in the expansion rings 23 of the two sleeve rings, and the sealing rings A6 and B9 are customized by the rubber factory; the connecting screws 13 and nuts 11 are preferably made of stainless steel; wherein the compensation tube 2 first uses an annular nylon webbing to constrain all the screws 10 in the hole E19 of the compensation tube 2;

[0054] B. Close the valve of large diameter steel pipe:

[0055] Completely close the valves in the inlet and outlet directions according to the location of the damaged part of the large-diameter steel pipe;

[0056] C. Cutting the damaged large diameter steel pipe:

[0057] After confirming the damaged part of the large diameter steel pipe, mark the cutting length on the large diameter steel pipe, and then use the cutting equipment to divide the large diameter steel pipe into large diameter steel pipe A1 and large diameter steel pipe B5; if there is a problem at the bend, use two sets of this application or take a suitable bend with a connecting flange;

[0058] D. Drilling holes on large diameter steel pipes:

[0059] According to the position of the compensation tube 2 near the screws 10 at both ends, a plurality of holes A15 are punched on the large diameter steel pipe A1 and a plurality of holes C17 are punched on the large diameter steel pipe B5. The apertures of the holes A15 and C17 can be slightly larger. Then, the inner and outer walls of the large diameter steel pipe A1 and the large diameter steel pipe B5 are cleaned to ensure that there are no stains and deformations. If there is local deformation, it can be corrected with tools. Then, nylon webbing is used to cover the plurality of holes A15 on the outer edge of the large diameter steel pipe A1. The two ends of the nylon webbing are fixed by hot melting to prevent the outer end of the screw 10 from popping out. Another nylon webbing is used to cover the plurality of holes C17 on the outer edge of the large diameter steel pipe B5. The two ends of the nylon webbing are fixed by hot melting.

[0060] E. Prepare epoxy resin filler 12:

[0061] The epoxy resin filler 12 ingredients of epoxy resin + diluent + curing agent are prepared in proportion; then a certain amount of the prepared epoxy resin filler 12 is mixed with asbestos powder to obtain an outer layer filler; the epoxy resin filler 12 is prepared according to the epoxy resin + diluent + curing agent = 10 + 30 + 20 weight parts; the epoxy resin filler 12 is used to soak the glass fiber rope and the epoxy resin filler 12 is used to soak the glass fiber; the outer layer filler is epoxy resin filler 12 + asbestos powder = 10 + 30 weight parts; the curing agent is T-31, the diluent is acetone, and the asbestos powder is dry asbestos powder.

[0062] F. Install compensation pipe and accessories:

[0063] Insert half of the compensation tube 2 into the large diameter steel pipe A1. At this time, the annular nylon webbing on the compensation tube 2 retreats, and the annular nylon webbing is removed with a cutter. Then, insert the other half of the compensation tube 2 into the large diameter steel pipe B5. At this time, the annular nylon webbing on the other half of the compensation tube 2 retreats, and the annular nylon webbing is removed with a cutter. Adjust the sealing ring B9 to stick to the end of the large diameter steel pipe A1, and then pull the collar B8 outward so that the hole D18 of the collar B8 expansion ring corresponds to the hole A15 of the large diameter steel pipe A1, and remove the nylon webbing of the large diameter steel pipe A1; then adjust the angle of half of the compensation tube 2 so that the screw 10 of half of the compensation tube 2 is inserted into the hole A15 of the large diameter steel pipe A1 under the action of the spring steel plate 3; then adjust the sealing ring A6 to stick to the end of the large diameter steel pipe B5, and pull the collar A7 outward so that the hole B16 of the collar A7 expansion ring 23 corresponds to the hole B16 of the large diameter steel pipe A1. Hole C17 of steel pipe B5, remove the nylon webbing of large-diameter steel pipe B5; place the annular sealing gasket between the two connecting flanges 14 of the two compensation pipes 2, and then adjust the angle of the other half of the compensation pipe 2 so that the screw 10 of the other half of the compensation pipe 2 is inserted into the hole C17 of the large-diameter steel pipe B5 under the action of the spring steel plate 3, use the connecting screw 13 to penetrate the light holes 28 of the two connecting flanges 14, and then use the nut to lock the connecting screw 13; then use the collar B8 to pull outward so that the hole D18 of the collar B8 expansion ring is sleeved on the screw 10 of half of the compensation pipe 2, at this time the sealing ring B9 is in an extruded state, and the screw 10 is locked with the nut 11; then use the collar A7 to pull outward so that the hole B16 of the collar A7 expansion ring is sleeved on the screw 10 of the other half of the compensation pipe 2, at this time the sealing ring A6 is in an extruded state, and the screw 10 is locked with the nut 11;

[0064] G. Fill the gap:

[0065] Soak the glass fiber in epoxy resin filler 12, and use a stick to fill the soaked glass fiber into the gap between the expansion ring of the ferrule B8 and the large-diameter steel pipe A1 and tamp it; then use a stick to fill the soaked glass fiber into the gap between the expansion ring of the ferrule A7 and the large-diameter steel pipe B5 and tamp it; use a putty knife to trim the outer layer of filler to the outside of the gap;

[0066] H. Pressure test:

[0067] Open the valve in the direction of incoming liquid, and after confirming that there is no leakage, open the valve in the direction of outgoing liquid.

[0068] Parts of the present invention not described in detail are prior art.

Claims

1. A large diameter steel pipe repair device, comprising a compensation pipe (2), a screw (10), a collar A (7), a collar B (8), a nut (11), a sealing ring A (6) and a sealing ring B (9), wherein: The compensating tube (2) is provided with the same number of circumferential holes E (19) located in the same axial direction near both ends, the inner ends of the matching number of screw rods (10) are respectively located in the holes E (19), and elastic supports for the inner ends of the screw rods (10) are respectively provided in the compensating tube (2) at the holes E (19); the sleeve ring A (7) and the sleeve ring B (8) have the same structure, wherein the inner wall of the reducing ring (24) of the sleeve ring A (7) is clearance-matched with the outer edge of the compensating tube (2), an expanding ring (23) is provided on one side of the reducing ring (24), and a plurality of holes B (16) corresponding to the holes E (19) of the compensating tube (2) are provided between the inner wall and the outer edge surface of the expanding ring (23); the two ends of the compensating tube (2) are inserted into the ends of the large-diameter steel tube A (1) and the large-diameter steel tube B (5), and the sleeve ring A (7) is provided with a plurality of holes B (16) corresponding to the holes E (19) of the compensating tube (2). A sealing ring A (6) is provided between the outer end surface of the reducing ring (24) and the end of the large diameter steel pipe B (5), a sealing ring B (9) is provided between the outer end surface of the reducing ring of the collar B (8) and the end of the large diameter steel pipe A (1), screws (10) near both ends of the compensating pipe (2) respectively pass through a hole A (15) near the end of the large diameter steel pipe A (1) and a hole C (17) near the end of the large diameter steel pipe B (5) as well as a hole B (16) of the expanding ring (23) of the collar A (7) and a hole D (18) of the expanding ring of the collar B (8), and are then locked by nuts (11), and a sealing agent is provided between the inner surface of the expanding ring (23) of the collar A (7) and the outer edge of the large diameter steel pipe B (5) and between the inner surface of the expanding ring of the collar B (8) and the outer edge of the large diameter steel pipe A (1).

2. The large diameter steel pipe repair device according to claim 1 is characterized in that: The compensating tube (2) is composed of two sections, and connecting flanges (14) are respectively provided at the joints of the two sections of the compensating tube (2). A plurality of connecting screws (13) are inserted through the light holes (28) of the two connecting flanges (14) and are fixed by nuts. An annular sealing gasket is provided on the opposite surfaces of the two connecting flanges (14). A plurality of spring steel plates (3) are respectively provided on the inner walls of the two compensating tubes (2), and the outer end of each spring steel plate (3) is fixedly connected to the inner end of the screw rod (10). The inner ends of the plurality of spring steel plates (3) are fixedly connected to the inner walls of the connecting flanges (14) of the two compensating tubes (2).

3. The large diameter steel pipe repair device according to claim 2 is characterized in that: The inner ends of the plurality of spring steel plates (3) are fixed in the clamping grooves (20) provided on the outer edge surfaces of the two support rings (4), and the two support rings (4) are respectively fixed to the inner walls of the connecting flanges (14) of the two compensation pipes (2).

4. The large diameter steel pipe repair device according to claim 1 is characterized in that: A transition ring (22) is provided between the reducing ring (24) and the expanding ring (23) of the sleeve ring A (7), and an annular step (25) is formed on the outer end surface of the reducing ring (24) on the inner surface of the transition ring (22).

5. The large diameter steel pipe repairing device according to claim 1 is characterized in that: The sealing ring A (6) has the same structure as the sealing ring B (9). A surrounding annular groove (26) is provided on the outer side surface of the sealing ring A (6) close to the inner wall. A pointed piece (27) is provided between the annular groove (26) and the inner wall. The outer edge of the sealing ring A (6) matches the inner wall of the expansion ring (23), and the inner wall of the sealing ring A (6) matches the outer edge of the compensation tube (2).

6. The large diameter steel pipe repairing device according to claim 1 is characterized in that: The caulking agent is an epoxy resin filler (12).

7. A repair method for a large diameter steel pipe using the repair device according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: Prefabricate the compensation pipe and necessary accessories, close the valve of the large diameter steel pipe, cut the large diameter steel pipe at the damaged part, drill holes in the large diameter steel pipe, mix epoxy resin filler (12), install the compensation pipe and accessories, plug the gap and conduct pressure test; A. Prefabricate the compensation tube and necessary accessories: According to the inner diameter of the installed large-diameter steel pipe, a compensation pipe (2), a collar A (7), a collar B (8), a sealing ring A (6), a sealing ring B (9), a nut (11) and a connecting screw (13) are manufactured to be able to be inserted into the large-diameter steel pipe; B. Close the valve of large diameter steel pipe: Completely close the valves in the inlet and outlet directions according to the location of the damaged part of the large-diameter steel pipe; C. Cutting the damaged large diameter steel pipe: After confirming the damaged part of the large diameter steel pipe, mark the cutting length on the large diameter steel pipe, and then use the cutting equipment to cut the large diameter steel pipe into large diameter steel pipe A (1) and large diameter steel pipe B (5); D. Drilling holes on large diameter steel pipes: According to the position of the compensating tube (2) near the screw rods (10) at both ends, a plurality of holes A (15) are punched on the large diameter steel tube A (1) and a plurality of holes C (17) are punched on the large diameter steel tube B (5), and then the large diameter steel tube A (1) and the large diameter steel tube B (5) are cleaned to ensure that there are no stains, and then a nylon webbing is put on the plurality of holes A (15) on the outer edge of the large diameter steel tube A (1), and the two ends of the nylon webbing are fixed by hot melting; another nylon webbing is put on the plurality of holes C (17) on the outer edge of the large diameter steel tube B (5), and the two ends of the nylon webbing are fixed by hot melting; E. Prepare epoxy resin filler (12): The epoxy resin filler (12) is prepared by mixing the epoxy resin, diluent and curing agent according to a certain proportion; then a certain amount of the prepared epoxy resin filler (12) is mixed with asbestos powder to obtain an outer layer filler; F. Install compensation pipe and accessories: Insert half of the compensation tube (2) into the large diameter steel tube A (1), and then insert the other half of the compensation tube (2) into the large diameter steel tube B (5), adjust the sealing ring B (9) to fit the end of the large diameter steel tube A (1), and then pull the collar B (8) outward so that the hole D (18) of the expansion ring of the collar B (8) corresponds to the hole A (15) of the large diameter steel tube A (1), and then adjust the angle of half of the compensation tube (2) so that the screw (10) of half of the compensation tube (2) is inserted into the hole A (15) of the large diameter steel tube A (1) under the action of the spring steel plate (3); then adjust the sealing ring A (6) to fit the end of the large diameter steel tube B (5), pull the collar A (7) outward so that the hole B (16) of the expansion ring (23) of the collar A (7) corresponds to the hole C (17) of the large diameter steel tube B (5), and place the annular sealing gasket on the two connecting flanges (14) of the two compensation tubes (2). Then adjust the angle of the other half of the compensation tube (2) so that the screw (10) of the other half of the compensation tube (2) is inserted into the hole C (17) of the large diameter steel tube B (5) under the action of the spring steel plate (3), and use the connecting screw (13) to pass through the light holes (28) of the two connecting flanges (14), and then use the nut to lock the connecting screw (13); then use the collar B (8) to pull outward so that the hole D (18) of the expansion ring of the collar B (8) is sleeved on the screw (10) of the half of the compensation tube (2), at this time the sealing ring B (9) is in an extruded state, and the screw (10) is locked with the nut (11); then use the collar A (7) to pull outward so that the hole B (16) of the expansion ring of the collar A (7) is sleeved on the screw (10) of the other half of the compensation tube (2), at this time the sealing ring A (6) is in an extruded state, and the screw (10) is locked with the nut (11); G. Fill the gap: Soak the glass fiber in epoxy resin filler (12), and use a stick to fill the soaked glass fiber into the gap between the expansion ring of the collar B (8) and the large-diameter steel pipe A (1) and tamp it down; then use a stick to fill the soaked glass fiber into the gap between the expansion ring of the collar A (7) and the large-diameter steel pipe B (5) and tamp it down; use a putty knife to trim the outer layer of filler to make the outside of the gap smooth; H. Pressure test: Open the valve in the direction of incoming liquid, and after confirming that there is no leakage, open the valve in the direction of outgoing liquid.

8. The repair method of the large diameter steel pipe repair device according to claim 7, characterized in that: Before using the compensation tube (2), all the screw rods (10) are restrained in the hole E (19) of the compensation tube (2) by using an annular nylon webbing. When in use, after the two compensation tubes (2) are respectively inserted into the inner holes of the large-diameter steel tube A (1) and the large-diameter steel tube B (5), the annular nylon webbing is removed by using a cutter.

9. The repair method of the large diameter steel pipe repair device according to claim 7, characterized in that: The epoxy resin filler (12) is prepared in the amount of epoxy resin + diluent + curing agent = 10 + 30 + 20 parts by weight; the epoxy resin filler (12) is used to soak the glass fiber rope and the epoxy resin filler (12) is used to soak the glass fiber.

10. The repair method of the large diameter steel pipe repair device according to claim 7, characterized in that: The outer layer filler is epoxy resin filler (12) + asbestos powder = 10 + 30 parts by weight.

Images