Method for repairing and launching a thin-walled hydroelectric power station cleaning ship damaged by grounding on ground

Abstract

The present application belongs to the technical field of maintenance of a pollution cleaning ship, and particularly relates to a method for repairing and launching a pollution cleaning ship with a damaged thin-walled body on a stranded ground, which comprises the following steps: S1, repairing a power system of the pollution cleaning ship; S2, repairing a ship body of the pollution cleaning ship; and S3, repairing a propeller propulsion system of a stern shaft of the pollution cleaning ship; wherein the repairing of the ship body comprises repairing of a deformed part, repairing of a leakage and a weak part, the repairing of the leakage and the weak part comprises checking before repairing to determine the leakage and the weak part, and the leakage and the weak part are repaired by using a direct welding or a steel plate welding repair method; and the thickness of the steel plate is less than that of a steel plate used for the ship body. The present application adopts different repairing methods according to different damage modes in the repairing process, avoids high repairing cost caused by direct replacement of a large number of components, and is simple and effective in the repairing process, so that the pollution cleaning ship can be quickly restored to operation.

Description

Technical Field

[0001] This invention belongs to the field of pollution control vessel repair technology, specifically relating to a method for repairing and launching a pollution control vessel for a thin-walled hydroelectric power station that has run aground and suffered damage. Background Technology

[0002] Spillway cleaning vessels are primarily used to remove suspended debris and pollutants from the water surface, achieving comprehensive water management. They are often deployed in major water sources. For example, some hydroelectric power stations also use spillway cleaning vessels to promptly remove surface debris and prevent pollutants from impacting the power station. During operation, spillway cleaning vessels inevitably suffer damage from collisions and grounding. Therefore, efficient hull repair technology is essential to ensure the vessels can quickly resume operation.

[0003] Existing ship repair methods include those based on analytical techniques to determine the damage condition and then propose repair methods. For example, CN111781921A discloses a rapid anchoring and grounding repair method for damaged ships. This method involves the following steps: analyzing the ship's damage condition based on stored data and proposing a repair solution; determining that the ship needs grounding repair based on the repair solution, detecting the anchoring system and analyzing the geographical conditions of the grounding site to determine the anchoring location; anchoring and grounding the ship at the predetermined location for repair; and after repair, using the anchor-retrieval process to move the ship away from the grounding site and return to the normal navigation channel. This repair method uses rapid anchoring to repair damaged ships. From damage analysis to providing a solution, analyzing the anchoring terrain, determining the anchoring point, guiding the ship to ground, and finally completing the repair and returning to the navigation channel, the entire process is systematically divided, avoiding the risk of sinking if the damaged ship continues to navigate. Simultaneously, the process at each stage is saved, providing historical data for subsequent research.

[0004] However, for cases where pollution control vessels are grounded for extended periods due to flooding, and their hulls are submerged or flooded for prolonged periods, resulting in severe damage, there is currently no timely and efficient method for repairing these vessels. Furthermore, some hydroelectric power stations are located near waterways with limited road transport conditions, further hindering the vessel repair process.

[0005] Therefore, there is an urgent need to provide a method for repairing and launching a debris removal vessel for a stranded, damaged thin-walled hydroelectric power station. Summary of the Invention

[0006] In order to solve the above-mentioned technical problems in the prior art, the present invention provides a method for repairing and launching a debris removal vessel for a stranded, damaged thin-walled hydroelectric power station.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows:

[0008] A method for repairing and launching a debris removal vessel for a stranded, damaged thin-walled hydroelectric power station, specifically including:

[0009] S1. Repair the power system of the cleaning vessel;

[0010] S2. Repair the hull of the pollution cleaning vessel;

[0011] S3. Repair the stern shaft propeller propulsion system of the cleaning vessel;

[0012] The hull repair includes repair of deformed parts, leakage and weak parts. The repair of leakage and weak parts includes: conducting an inspection before repair to identify leakage and weak parts, and repairing the leakage and weak parts by direct welding or steel plate welding repair methods; the thickness of the steel plate is less than the thickness of the steel plate used for the hull.

[0013] Furthermore, an inspection is conducted before repairs. The specific method is as follows: at night, a light source is used to shine from inside each compartment of the ship onto the ship's walls. By observing from outside the ship, whether there is light transmission or weak light, leaks and weak points are identified and marked.

[0014] Furthermore, for the leaking part, the leaking area is set as S, and a threshold S0 is set. If the area is less than the threshold S0, the leaking part is directly repaired by welding. If the area S is greater than or equal to the threshold S0, the steel plate repair method is used for repair. The thickness of the steel plate is 1mm less than the thickness of the steel plate used for the hull.

[0015] Furthermore, the repair of deformed areas includes:

[0016] For locally bent areas, they are directly reset, and then butt welding is performed on the bent areas.

[0017] For overall hull deformation, hooks are installed on the concave surface at the deformation location. The hooks are pulled along the reset direction of the concave location until the deformation location is reset.

[0018] Furthermore, before repairing the deformed part, the degree of deformation of the deformed part is assessed. If the degree of deformation is lower than the deformation judgment value, the local bending part is directly repaired. If the degree of deformation is not lower than the deformation judgment value, the bending part is cut off and a replacement part is used to repair the bending part.

[0019] Furthermore, before repairing the deformed parts, the degree of deformation is assessed. If the degree of deformation is lower than the deformation judgment value, the entire hull is pulled and repaired. If the degree of deformation is not lower than the deformation judgment value, the entire hull is heated using heating equipment. Then, a hammer is used to strike the outer perimeter of the heated area on the protruding surface of the deformed area, and the striking position gradually shrinks towards the heating center.

[0020] Furthermore, the degree of deformation of the deformed part is evaluated, specifically including: marking the reset projection line of the deformed part on the adjacent undeformed plate surface of the deformed part, measuring the maximum distance D of the deformed part from the reset projection line and the length L of the deformed part, calculating the ratio of the maximum distance D to the length L, and setting the deformation judgment value B.

[0021] If D / L < B, then the local bent parts can be repaired directly, or the entire hull can be repaired by pulling.

[0022] If D / L≥B, then for the local bending part, cut off the bending part and repair the bending part with a replacement part; or, for the entire hull, use heating equipment to heat the deformed area, and then use a hammer to strike the outer perimeter of the heated area on the protruding surface of the deformed area, with the striking position gradually shrinking towards the heating center.

[0023] Furthermore, a deformation judgment value B is set according to the plate thickness of the deformed part, and the plate thickness of the deformed part is set to N. If N < 5 mm, the deformation judgment value is B1; if 8 mm ≥ N ≥ 5 mm, the deformation judgment value is B2; if N ≥ 8 mm, the deformation judgment value is B3; and B1 < B2 < B3, and B1, B2, and B3 are all constants in [0.2, 0.65].

[0024] Furthermore, the repair of the cleaning vessel's power system specifically includes: first, pumping out the accumulated water in the engine room, then inspecting the starter motor; and then dismantling the engine.

[0025] Furthermore, the disintegration engine specifically includes:

[0026] S101. Rinse the engine surface clean of mud and impurities, and drain the waste engine oil, water in the coolant tank, and waste diesel from the engine.

[0027] S102, Fix the crankshaft flywheel and continue until the cylinder cleaning is complete;

[0028] S103. Disassemble the engine from the outside in, including the intake manifold, exhaust manifold, fuel tank, injectors, cylinder head cover, cylinder head, fuel lines, diesel oil filter, air filter, oil pan, and oil strainer, and clean each part with clean diesel fuel.

[0029] S104. Use a brush soaked in gasoline or diesel oil to clean the inner wall of the engine cylinder, then remove the piston and connecting rod assembly and soak and clean the piston and connecting rod assembly.

[0030] S105. Use diesel fuel to clean the crankcase, oil pump, oil cooler, oil lines, timing gear chamber, and crankshaft journals.

[0031] S106. Clean impurities from the waterway;

[0032] S107, Reassembly and Trial Operation.

[0033] Furthermore, the repair of the stern propeller propulsion system of the pollution cleaning vessel specifically includes: lifting the stern hull until the stern propeller is off the ground, removing the propeller from the hull, placing the propeller on a lofting platform, and then calibrating the propeller.

[0034] Furthermore, the methods for repairing and launching the debris removal vessel for the stranded, damaged thin-walled hydroelectric power station also include:

[0035] S4. After the pollution control vessel is repaired, it will be launched. First, move the pollution control vessel horizontally to the water's edge. Then, with the bow and stern at an angle to the water's edge, gradually tilt and move it until the bow touches the water. Then, adjust the bow and stern to be parallel to the water's edge and push the pollution control vessel into the water sideways.

[0036] Furthermore, as the ship gradually tilts and moves until the bow touches the water, a drag anchor is placed at the stern of the hull; before the stern begins to tilt, wooden blocks or airbags are placed at the bottom of the stern of the hull; and as the hull tilts and moves downward, the hull is anchored and slid down the back side.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The present invention provides a method for repairing and launching a debris removal vessel damaged on a grounded thin-walled hydroelectric power station. This method is used to repair debris removal vessels that have been grounded for a long time and submerged in water. Specifically, it involves repairing the power system, the hull, and the stern shaft propeller. The entire repair process adopts different repair methods according to the different types of damage, avoiding excessive repair costs caused by directly replacing a large number of parts. At the same time, the repair process is simple and effective, enabling the debris removal vessel to quickly resume operation.

[0039] The present invention provides a method for repairing and launching a cleanup vessel for a stranded, thin-walled hydroelectric power station. For leaks and weak points in the hull, different repair methods are adopted according to the area of ​​the seepage, which avoids waste of resources and speeds up the repair process.

[0040] The present invention provides a method for repairing and launching a debris removal vessel for a stranded, damaged thin-walled hydropower station. For deformed parts, the method first determines the degree of deformation and then adopts different repair methods according to the degree of deformation, thereby achieving the goal of fast repair process and good repair effect.

[0041] The present invention provides a method for repairing and launching a debris removal vessel for a stranded, damaged thin-walled hydropower station. The launching process is divided into three stages: a horizontal translation stage, an inclined downward translation stage, and a water entry stage. Each stage adopts a different direction of movement to avoid capsizing accidents and ensure that the hull is not damaged secondary. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the method flow of the present invention. Detailed Implementation

[0043] The technical solution of the present invention will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are not all embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0044] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments should not be construed as limiting the scope of the invention. The following description of exemplary embodiments is merely illustrative and is not intended to limit the invention or its application or use in any way. Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail herein, but where applicable, such techniques, methods, and apparatus should be considered part of this specification.

[0045] This invention provides a method for repairing and launching a debris removal vessel for a hydroelectric power station damaged on a stranded surface. The method is applied to a hydroelectric power station. The vessel has a transverse frame structure, is made of steel, has a net weight of 17 tons, a total length of 16.5 meters, a beam of 3 meters, a depth of 0.9 meters, a height of 3.1 meters, a full-load draft of 0.6 meters, an empty-load draft of 0.26 meters, a displacement of 22 tons, and a deadweight tonnage of 14 tons. This debris removal vessel is used for river debris retrieval and transportation operations, with a loading volume of 10 cubic meters. 3 During another flood, a wastewater cleaning vessel was washed ashore in front of a house. After the water receded, it ran aground on the platform in front of the house, bow facing upstream, with the hull directly in contact with the concrete ground. It remained there for eight months, during which time it was affected by traffic and no drainage or protective measures were taken. Specific methods for repairing and relaunching the wastewater cleaning vessel include:

[0046] S1. Repair the power system of the cleaning vessel; the power system uses diesel power, specifically including: first, pump out the water in the engine room. Due to the accumulation of floodwater and rainwater, the water in the engine room has submerged the diesel engine unit. Use a 1KW bottom suction water pump to pump out the water while avoiding burning out the water pump.

[0047] Next, check the starter motor; the motor model is QDJB15A-8KW. Disconnect the battery power supply interface, remove the starter motor from the diesel engine and check it on the deck. If the motor loses its starting function, replace it with the same model.

[0048] Then, the engine is disassembled completely, including the diesel engine, and the lubrication components are cleaned. The diesel engine is thoroughly disassembled and carefully inspected to prevent damage caused by the large amounts of silt and corrosive substances contained in the floodwaters. After prolonged immersion in water, silt and other impurities can remain inside the engine, forming abrasive particles on friction surfaces and causing blockages and corrosion in through-holes and channels. Specifically, this includes:

[0049] S101. Use high-pressure clean water to wash away mud and sand impurities from the engine surface, and drain the waste engine oil, water from the coolant tank, and waste diesel from the engine.

[0050] S102. Use calipers, sticks, ropes, etc. to fix the crankshaft flywheel. Do not rotate the crankshaft flywheel before the cylinder is cleaned to prevent mud and sand from entering and damaging the cylinder. Continue until the cylinder cleaning is completed.

[0051] S103. Disassemble the engine from the outside in, including the intake manifold, exhaust manifold, fuel tank, injectors, cylinder head cover, cylinder head, fuel lines, diesel oil filter, air filter, oil pan, and oil strainer. Clean each part with clean diesel fuel and replace all types of paper filter elements and gaskets.

[0052] S104. Use a brush or cotton cloth soaked in gasoline or diesel oil to clean the inner wall of the engine cylinder. Then remove the piston and connecting rod assembly and soak and clean the piston and connecting rod assembly. If the cylinder liner, piston ring, valve and valve seat are rusted, remove the rust or grind them. If the rust is severe, replace them with new parts.

[0053] S105. Use diesel fuel to clean the crankcase, oil pump, oil cooler, oil lines, timing gear chamber, and crankshaft journal to ensure unobstructed lubrication. Use clean diesel fuel to clean the disassembled fuel injection pump, injectors, and fuel transfer pump. If the precision parts of each pump are slightly corroded, apply engine oil and rub them together. If the corrosion cannot be eliminated after rubbing, replace them.

[0054] S106. Clean impurities from the water passages; use clean water to remove mud and sand from the radiator, water jacket, and water passage holes, and use high-pressure compressed air to blow away impurities from the water passages; meticulously clean and unclog the air vents or oil reservoirs on the diesel engine; inspect all mating parts for damage and replace damaged parts promptly. Wipe the surfaces of the parts clean and apply cleaning oil to the mating surfaces;

[0055] S107. Reassembly and Trial Run. Assemble the diesel engine according to the technical requirements, add enough diesel, engine oil and coolant, and replace the battery. After the diesel engine is assembled, start it for trial run and check for any oil leaks, water leaks, air leaks and abnormal noises. If there is excessive vibration or abnormal noise, stop the engine immediately and check and troubleshoot.

[0056] S2. Repair the hull of the pollution cleaning vessel; the hull repair includes repair of deformed parts, leakage and weak parts, the leakage and weak parts repair includes: inspecting before repair to identify leakage and weak parts, and repairing leakage and weak parts by direct welding or steel plate welding repair methods; the thickness of the steel plate is less than the thickness of the steel plate used for the hull.

[0057] Before repair, an inspection is carried out. The specific method is as follows: use hydraulic jacks to lift the hull until it is 30cm off the ground, and support it with steel sections. At night, use a light source to shine from inside each compartment of the ship onto the hull wall. Observe from the outside of the ship to determine whether there is light transmission or weak light, identify the leaks and weak points, and mark them.

[0058] The repair of deformed areas includes:

[0059] For locally bent areas, they are directly reset, and then butt welding is performed on the bent areas.

[0060] For overall hull deformation, hooks are installed on the concave surface at the deformation location. The hooks are pulled along the reset direction of the concave location until the deformation location is reset.

[0061] Preferably, before repairing the deformed part, the degree of deformation of the deformed part is assessed. If the degree of deformation is lower than the deformation judgment value, the local bending part is directly repaired, and reinforcement with dressing may be applied if necessary. If the degree of deformation is not lower than the deformation judgment value, the bending part is cut off and a replacement part is used to repair the bending part.

[0062] Before repairing the deformed parts, the degree of deformation is assessed. If the degree of deformation is lower than the deformation judgment value, the entire hull is pulled and repaired. If the degree of deformation is not lower than the deformation judgment value, the entire hull is heated using heating equipment. Then, a hammer is used to strike the outer perimeter of the heated area on the protruding surface of the deformed area, and the striking position gradually shrinks towards the heating center.

[0063] The degree of deformation of the deformed part is evaluated, specifically including: marking the reset projection line of the deformed part on the adjacent undeformed plate surface of the deformed part, measuring the maximum distance D of the deformed part from the reset projection line and the length L of the deformed part, calculating the ratio of the maximum distance D to the length L, and setting the deformation judgment value B.

[0064] If D / L < B, then the local bent parts can be repaired directly, or the entire hull can be repaired by pulling.

[0065] If D / L≥B, then for the local bending part, cut off the bending part and repair the bending part with a replacement part; or, for the entire hull, use heating equipment to heat the deformed area, and then use a hammer to strike the outer perimeter of the heated area on the protruding surface of the deformed area, with the striking position gradually shrinking towards the heating center.

[0066] The deformation judgment value B is set according to the plate thickness of the deformed part. The plate thickness of the deformed part is set as N. If N < 5mm, the deformation judgment value is B1; if 8mm ≥ N ≥ 5mm, the deformation judgment value is B2; if N ≥ 8mm, the deformation judgment value is B3; and B1 < B2 < B3. B1, B2, and B3 are all constants in [0.2, 0.65].

[0067] For leaking areas, the leaking area is defined as S, and a threshold S0 is set. If the area is less than the threshold S0, the leaking area is directly repaired by welding. If the area S is greater than or equal to the threshold S0, a steel plate repair method is used, where the steel plate thickness is 1mm less than the thickness of the hull steel plate. During welding, low-current carbon dioxide shielded welding is used. Before welding, dirt on the welding position is ground and removed. Welding is carried out outside the hull. After welding, slag removal and local anti-corrosion work are performed. After the leaking and weak points are welded, a 12-hour water filling test is conducted inside the hull. If there is no leakage, the test is passed and the next step can be carried out.

[0068] S3. Repair the stern shaft propeller propulsion system of the cleaning vessel; due to the deformation of the stern shaft propeller under vertical support on the ground, the three blades are asymmetrical and need to be repaired. Specifically, this includes: using hydraulic jacks to lift the stern hull until the stern shaft propeller is off the ground, removing the propeller from the hull, placing the propeller on a lofting platform, and then correcting the propeller. The propeller deformation is repaired using the heat shrinking impact molding method.

[0069] S4. After the pollution control vessel is repaired, it will be launched, which includes three stages:

[0070] Horizontal section: Move the pollution cleanup vessel horizontally to the water's edge.

[0071] Inclined section: Gradually tilt the boat at an angle to the water's edge, moving it until the bow touches the water.

[0072] Entry into the water: Adjust the bow and stern of the vessel to be parallel to the shore, and push the cleaning vessel into the water sideways.

[0073] For the horizontal section, due to the long service life of the cleaning vessel, coupled with grounding on land and extensive corrosion, using the traction-plane friction method during movement would damage the hull. Therefore, pine logs were used as support rollers, placed on the hull and the horizontal ground, and a hand-operated hoist was installed at the front of the hull for traction. During the forward movement of the hull, the direction of movement was corrected by traction points set on both sides of the bow, combined with traction conversion. At the same time, large trees and cement bases in the surrounding area were used as anchoring points for the hoist traction.

[0074] The inclined section: Due to changes in ground surface and bank slope, there is no gradual transition section between the inclined and horizontal sections. The greatest risk in the inclined section is the transition from horizontal to inclined, which occurs when the ship's center of gravity changes from horizontal to inclined. During the bow-pulling process, the ship gradually becomes suspended above the inclined surface. At this point, an anchor is placed at the stern to prevent the ship's center of gravity from shifting forward onto the inclined surface as the bow descends, causing a sudden acceleration that could lead to loss of control and a slide. Before the stern reaches the inclined surface, the bank slope is not hardened and is relatively soft due to water immersion. Reinforced wooden blocks or airbags must be placed at the stern of the ship on the slope to prevent the guide vanes and propeller blades, which are lower than the bottom of the ship, from contacting the ground and deforming or being damaged. Wooden blocks are continuously added along the stern as the ship descends the slope to maintain a raised stern position. When the ship is descending the slope, because the soil on the outer side is softer than the inner side, hoists are used to anchor the hull on the back side to prevent the ship from listing and causing an accident.

[0075] Entry into the water: As the bow approaches the water, underwater obstacles are cleared. The hull is then leveled on a slope, and a jack system is used to lift the bow. A launching ramp is installed at the bottom of the hull, perpendicular to the riverbank. The ramp is constructed of round pine logs. The power station stops generating electricity, and water is stored to raise the river level. As the water level rises, the hull is pushed into the water while rising. After the hull enters the water, it is moored to prevent it from drifting and shifting.

[0076] The above specific embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for repairing and launching a thin-walled hydroelectric power station cleaning ship damaged by grounding on the ground, characterized in that, Specifically, it includes: S1. Repair the power system of the cleaning vessel; S2. Repair the hull of the pollution cleaning vessel; S3. Repair the stern shaft propeller propulsion system of the cleaning vessel; The hull repair includes repair of deformed parts, leakage and weak parts. The repair of leakage and weak parts includes: conducting an inspection before repair to identify leakage and weak parts, and repairing the leakage and weak parts by direct welding or steel plate welding; the thickness of the steel plate is less than the thickness of the steel plate used for the hull. Repairing the power system of the cleaning vessel specifically includes: first, pumping out the water accumulated in the engine room, then checking the starter motor; and then dismantling the engine. The dismantling engine specifically includes: S101. Rinse the engine surface clean of mud and impurities, and drain the waste engine oil, water in the coolant tank, and waste diesel from the engine. S102, Fix the crankshaft flywheel and continue until the cylinder cleaning is complete; S103. Disassemble the engine from the outside in, including the intake manifold, exhaust manifold, fuel tank, injectors, cylinder head cover, cylinder head, fuel lines, diesel oil filter, air filter, oil pan, and oil strainer, and clean each part with clean diesel fuel. S104. Use a brush soaked in gasoline or diesel oil to clean the inner wall of the engine cylinder, then remove the piston and connecting rod assembly and soak and clean the piston and connecting rod assembly. S105. Use diesel fuel to clean the crankcase, oil pump, oil cooler, oil lines, timing gear chamber, and crankshaft journals. S106. Clean impurities from the waterway; S107, Reassembly and Trial Operation.

2. The method of claim 1, wherein, Before repairs, an inspection is conducted. The specific method is as follows: at night, a light source is used to shine from inside each compartment of the ship onto the ship's walls. By observing from outside the ship, whether there is light transmission or weak light, leaks and weak points are identified and marked.

3. The method according to claim 1, characterized in that, For the leaking part, the leaking area is set as S, and a threshold S0 is set. If the area is less than the threshold S0, the leaking part is directly repaired by welding. If the area S is greater than or equal to the threshold S0, the steel plate repair method is used for repair. The thickness of the steel plate is 1mm less than the thickness of the steel plate used for the hull.

4. The method according to claim 1, characterized in that, Repair of deformed areas includes: For locally bent areas, they are directly reset, and then butt welding is performed on the bent areas. For overall hull deformation, hooks are installed on the concave surface at the deformation location. The hooks are pulled along the reset direction of the concave location until the deformation location is reset.

5. The method according to claim 4, characterized in that, Before repairing deformed parts, the degree of deformation is assessed. If the degree of deformation is lower than the deformation judgment value, the local bent parts are directly repaired. If the degree of deformation is not lower than the deformation judgment value, the bent parts are cut off and replaced with replacement parts to repair the bent parts.

6. The method according to claim 4, characterized in that, Before repairing the deformed parts, the degree of deformation is assessed. If the degree of deformation is lower than the deformation judgment value, the entire hull is pulled and repaired. If the degree of deformation is not lower than the deformation judgment value, the entire hull is heated using heating equipment. Then, a hammer is used to strike the outer perimeter of the heated area on the protruding surface of the deformed area, and the striking position gradually shrinks towards the heating center.

7. The method according to claim 5 or 6, characterized in that, The degree of deformation of the deformed part is evaluated, specifically including: marking the reset projection line of the deformed part on the adjacent undeformed plate surface of the deformed part, measuring the maximum distance D of the deformed part from the reset projection line and the length L of the deformed part, calculating the ratio of the maximum distance D to the length L, and setting the deformation judgment value B. If D / L < B, then the local bent parts can be repaired directly, or the entire hull can be repaired by pulling. If D / L≥B, then for the local bending part, cut off the bending part and repair the bending part with a replacement part; or, for the entire hull, use heating equipment to heat the deformed area, and then use a hammer to strike the outer perimeter of the heated area on the protruding surface of the deformed area, with the striking position gradually shrinking towards the heating center.

8. The method according to claim 7, characterized in that, The deformation judgment value B is set according to the plate thickness of the deformed part. The plate thickness of the deformed part is set as N. If N < 5mm, the deformation judgment value is B1; if 8mm ≥ N ≥ 5mm, the deformation judgment value is B2; if N ≥ 8mm, the deformation judgment value is B3; and B1 < B2 < B3. B1, B2, and B3 are all constants in [0.2, 0.65].

9. The method according to claim 1, characterized in that, Repairing the stern propeller propulsion system of the pollution cleaning vessel specifically includes: lifting the stern hull until the stern propeller is off the ground, removing the propeller from the hull, placing the propeller on a lofting platform, and then calibrating the propeller.

10. The method according to claim 1, characterized in that, Methods for repairing and launching debris removal vessels damaged on stranded, thin-walled hydroelectric power stations also include: S4. After the pollution control vessel is repaired, it will be launched. First, move the pollution control vessel horizontally to the water's edge. Then, with the bow and stern at an angle to the water's edge, gradually tilt and move it until the bow touches the water. Then, adjust the bow and stern to be parallel to the water's edge and push the pollution control vessel into the water sideways.

11. The method according to claim 10, characterized in that, As the ship gradually tilts and moves until its bow touches the water, a drag anchor is placed at the stern of the hull; before the stern begins to tilt, wooden blocks are placed at the bottom of the stern of the hull; as the hull tilts and moves downwards, the hull is anchored and slid down on the back side of the hull.

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