Cathodic protection fast repairing device and repairing method based on underwater plug-in electrical connector

Abstract

The application relates to a quick repairing device and method for underwater plug-in electric connector cathode protection, and belongs to the technical field of marine metal corrosion prevention, in particular to a quick repairing device and method for impressed current cathode protection of an underwater plug-in electric connector applied to a marine floating platform. A plurality of underwater plug-in electric connector sockets are arranged on a composite cable; underwater plug-in electric connector plugs can be inserted into the underwater plug-in electric connector sockets; one of a rod-shaped auxiliary anode and a reference electrode is separately arranged on the underwater plug-in electric connector plugs; a plurality of preset underwater plug-in electric connector sockets are arranged on the composite cable; and sealing devices with waterproof functions are arranged on the composite cable to seal the underwater plug-in electric connector sockets, the underwater plug-in electric connector plugs and the preset underwater plug-in electric connector sockets.

Description

TECHNICAL FIELD

[0001] The application is based on a quick repair device and method for underwater plug-in electrical connector cathodic protection, and relates to the technical field of marine metal corrosion prevention, in particular to a quick repair device for impressed current cathodic protection applied to offshore floating platforms based on underwater plug-in electrical connectors and a quick repair method thereof. BACKGROUND

[0002] The offshore floating platform is a steel structure platform, and is a widely used drilling platform and construction platform at present. The offshore platform is anchored and floats on the ocean. Since seawater is a strong corrosive medium, if effective corrosion prevention measures are not taken, the floating platform will be corroded and damaged in the harsh marine environment, which will shorten the service life of the platform and cause losses to the national economy and property.

[0003] The corrosion protection of the steel structure platform in the marine environment generally adopts the sacrificial anode cathodic protection method. However, a large amount of aluminum, zinc and heavy metal ions are released into seawater during the dissolution process of the sacrificial anode, which poses a potential threat to the marine ecosystem. Since the electrolytic aluminum industry is a high-energy-consuming industry, the smelting and dissolution of the sacrificial anode consumes the natural environment twice. For the floating platform that has reached the design life but still needs to continue to use, or the in-service offshore platform whose original cathodic protection system fails and needs to be replaced, the service life must be extended through cathodic protection repair technology. Considering the environmental factors, the impressed current repair method has a simpler structure and is more environmentally friendly.

[0004] Chinese patent document CN108286249A discloses a marine platform tension type impressed current cathodic protection system, which comprises a rectifier, an upper end fixing device, a connecting piece I, a composite cable, a connecting piece II and a lower end fixing device. The composite cable is provided with a reference electrode and an auxiliary anode at a specified position, and end cable joints are arranged at the upper and lower ends of the composite cable and connected with the fixing devices through connecting parts. By adjusting the tension of the composite cable to limit its deflection deformation, the composite cable, the auxiliary anode and the reference electrode are prevented from being damaged due to collision with the marine platform structure under the action of wind, waves and currents. The installation and arrangement method is characterized in that the tension type impressed current cathodic protection system and the fixing device thereof are pre-installed before the marine platform is launched, and after the platform is positioned, other components of the tension type impressed current cathodic protection system are lowered to complete the offshore system assembly. The number and distribution position of the components in the system can be determined by numerical simulation and simulation calculation. This installation method can only achieve cathodic protection of the whole platform, cannot effectively repair the local part, and the auxiliary anode is arranged in the central shaft of the jacket platform and releases current from top to bottom, which can only regulate the current distribution of the whole platform.

[0005] Chinese patent document CN104278277A discloses a sacrificial anode stack for cathodic protection quick repair, which comprises a sacrificial anode stack and a mounting clamp connected with the sacrificial anode stack. The mounting clamp is a U-shaped structure matched with a tubular metal structure. The sacrificial anode stack is a frame structure, which comprises a frame, a plurality of sacrificial anodes and counterweights mounted on the frame. The invention has simple structure and is easy to install. It can quickly repair the cathodic protection of the marine metal structure and avoid the corrosion and damage of the marine metal structure by seawater. It can be conveniently installed by underwater robots or divers. Although the installation cost is reduced, the structure cannot achieve precise repair control. The sacrificial anode arrangement cannot be changed again, and further regulation and control cannot be achieved for the subsequent potential changes. The application of impressed current system can control the output current of different anodes, and thus targeted adjustment can be achieved. At the same time, the sacrificial anode system itself will cause damage to the marine environment compared with the impressed current system, and a large amount of metal ions will be released into the marine environment, causing a certain degree of pollution.

[0006] Chinese patent document CN113981454A discloses an impressed current cathodic protection local repair device for a floating platform and a repair method thereof. The device comprises a waterproof junction box, a potential monitor, an ocean floating platform deck, an ocean floating platform, a current monitoring sensor, a potential monitoring sensor, a sacrificial anode and a sacrificial anode protection frame. The current control device is installed in the interior of the waterproof junction box. The net-shaped auxiliary anode and the reference electrode are arranged outside the ocean floating platform and fixed on the composite cable through auxiliary anode sealing structure and reference electrode sealing structure, and connected with the wires in the composite cable. The composite cable is wound on a pay-off device. The head end of the composite cable is electrically connected with the current control device, and the tail end is connected to the sacrificial anode protection frame. The net-shaped auxiliary anode and reference electrode device will be lost with the increase of service life, and thus may appear a state of low working efficiency or even no work. At this time, the underwater cathodic protection quick repair will fail and other quick repair devices need to be placed again, which greatly increases the operation cost and operation time. In addition, if the outside of other underwater structures of the floating platform or the sacrificial anode is damaged with the increase of service life, this invention also needs to place other repair devices for quick repair, which will lead to more chaotic underwater devices and more serious marine organism attachment, affecting the platform operation draft and causing other dangers. In addition, multiple placement of the quick repair device will increase the material consumption and thus increase the operation cost, and also increase the offshore operation time and thus increase the danger of the operation personnel.

[0007] However, the position of the complex platform structure to be repaired is uncertain, the required protection current of the to-be-repaired area is different, in addition, as the service life increases, more and more places may be damaged, therefore, according to the actual damage and future damage, a flexible, quick installation and long-term reliable cathodic protection quick repair device is designed to reduce the offshore operation time, reduce the offshore operation risk and protect the personal safety of the operation personnel.

[0008] In view of the problems in the prior art, it is necessary to design a new type of cathodic protection quick repair device and repair method based on underwater plug-in electrical connector to overcome the problems in the prior art. SUMMARY

[0009] According to the prior art, as the service life increases, more and more places of the underwater part of the floating platform are damaged and need to be repaired, but the position of the complex platform structure to be repaired is uncertain, and the required protection current of the repair area is different, and a cathodic protection quick repair device and repair method based on underwater plug-in electrical connector are provided. According to the actual damage and future damage, a flexible, quick installation and long-term reliable cathodic protection quick repair device is designed to reduce the offshore operation time, reduce the offshore operation risk, protect the personal safety of the operation personnel and reduce the secondary or multiple deployment cost.

[0010] The technical means adopted by the present application are as follows:

[0011] A cathodic protection quick repair device based on underwater plug-in electrical connector, comprising: a pay-off tensioning device, a composite cable, a potential monitoring sensor end connection module, a waterproof junction box, a current control device, a potential monitoring device and an intermediate connection module; the potential monitoring sensor and the potential monitoring device are arranged on the floating support platform; the composite cable is wound on the pay-off tensioning device, one end of the composite cable is connected with the current control device and the potential monitoring device in the waterproof junction box, and the other end is provided with an end connection module for fixing on the bottom of the floating support platform; a plurality of intermediate connection modules are arranged in the middle of the composite cable for fixed connection with the floating support platform;

[0012] Further, a plurality of underwater plug-in electrical connector sockets are arranged on the composite cable;

[0013] Further, the underwater plug-in electrical connector socket can be inserted with an underwater plug-in electrical connector plug;

[0014] Further, one of a rod-shaped auxiliary anode and a reference electrode is separately assembled on the underwater plug-in electrical connector plug;

[0015] Further, a plurality of preset underwater plug-in electrical connector sockets are arranged on the composite cable.

[0016] Further, a sealing device with waterproof function is arranged on the composite cable to seal the underwater plug-in electrical connector sockets and the underwater plug-in electrical connector plugs and the preset underwater plug-in electrical connector sockets.

[0017] Further, the sealing device is arranged on the composite cable and is electrically connected with the internal core wires of the composite cable.

[0018] Further, the underwater plug-in electrical connector sockets are electrically connected with different internal core wires of the composite cable in sequence and are recorded.

[0019] Further, the core wires in the first end of the composite cable which are electrically connected with the underwater plug-in electrical connector sockets spaced from each other are connected with the terminal box of the data acquisition card device on the potential monitoring equipment, and the remaining internal core wires in the first end of the composite cable which are electrically connected with the underwater plug-in electrical connector sockets spaced from each other are connected with the current control equipment in the waterproof junction box.

[0020] Further, the distance between the adjacent two underwater plug-in electrical connector sockets is 2-5 meters.

[0021] Further, the negative pole of the current control equipment is connected with the offshore platform through the ground wire, and the positive pole is electrically connected with the underwater plug-in electrical connector sockets spaced from each other in the first end of the composite cable.

[0022] Further, the water pressure resistance of the sealing device connecting the composite cable and the underwater plug-in electrical connector socket is greater than 1.5Mpa.

[0023] Further, the water pressure resistance of the underwater plug-in electrical connector plug and the underwater plug-in electrical connector socket is greater than 10Mpa.

[0024] Further, the rod-shaped auxiliary anode is mounted on the underwater plug-in electrical connector plug through a waterproof joint.

[0025] Further, the reference electrode is mounted on the underwater plug-in electrical connector plug through a waterproof joint.

[0026] Further, a protective cap for the underwater plug-in electrical connector socket is screwed on the preset underwater plug-in electrical connector socket for standby.

[0027] Further, the repair method based on the underwater plug-in electrical connector cathodic protection rapid repair device comprises the following steps:

[0028] 1. Through the potential monitoring sensor installed on the offshore platform, the overall potential of the platform is monitored, and the potential monitoring software feeds back information in real time, when the platform monitoring point potential does not meet the specification -800mV~ -1150mV(Ag / AgCl), the potential monitoring software will issue an alarm, the software will calculate through big data, and preliminarily judge the platform failure area, the diver or ROV enters the water to check, determines the sacrificial anode failure area or the anticorrosive coating peeling position, and the composite cable repair device is arranged around;

[0029] 2. The underwater plug-in electrical connector plug with a rod-shaped auxiliary anode and a reference electrode is inserted into the underwater plug-in electrical connector socket, and the underwater plug-in electrical connector socket protection cap is screwed on the underwater plug-in electrical connector socket that is not inserted, for standby;

[0030] 3. The designed composite cable first end is connected to the waterproof junction box, and the internal core wire of the composite cable is respectively connected to the current control device and the potential monitoring device according to the design; the composite cable bearing body is wound on the pay-off tension device, and the other end is connected to the sacrificial anode protection frame through the end connection module;

[0031] 4. The rod-shaped auxiliary anode is powered by the current control device to achieve the impressed current cathodic protection of the platform;

[0032] 5. The platform potential is monitored through the potential monitoring sensor installed on the offshore platform, and the reference electrode on the underwater plug-in electrical connector plug connected with the composite cable can also be used as a monitoring point to monitor the overall potential of the offshore platform; the current control device changes the current size of the rod-shaped auxiliary anode, and the potential monitoring software feeds back data in real time to determine the effectiveness of the quick repair device;

[0033] 6. As the service life of the ocean increases, other positions on the outer surface of the underwater structure of the offshore platform may successively appear sacrificial anode failure areas or anticorrosive coating peeling areas, at this time, the diver can insert the underwater plug-in electrical connector plug with a rod-shaped auxiliary anode and a reference electrode into the underwater plug-in electrical connector socket near the failure area position;

[0034] 7. The rod-shaped auxiliary anode newly inserted is powered by the current control device to achieve the impressed current cathodic protection of the platform;

[0035] 8. The overall potential of the platform is monitored through the potential monitoring sensor installed on the offshore platform and the reference electrode of the underwater plug-in electrical connector plug, and the potential monitoring software feeds back data in real time to determine the effectiveness of the quick repair device.

[0036] Compared with the prior art, the present application has the following advantages:

[0037] 1. The underwater plug-in electric connector-based cathodic protection quick repair device and method provided by the application can effectively ensure water tightness, and the developed quick repair device is long-term reliable and quick and effective.

[0038] 2. The underwater plug-in electric connector-based cathodic protection quick repair device and method provided by the application, a plurality of underwater plug-in electric connector sockets are preset on the composite cable, when other parts are damaged as the service life increases, a diver can immediately plug in the underwater plug-in electric connector plug with the rod-shaped auxiliary anode underwater plug-in electric connector and the reference electrode, to realize more rapid repair, so that the ocean floating platform full-cycle protection and life extension are realized.

[0039] 3. The underwater plug-in electric connector-based cathodic protection quick repair device and method provided by the application, the area to be repaired is analyzed by using potential monitoring software on the platform, and the underwater plug-in electric connector-based cathodic protection quick repair device is installed and laid on the deck, thereby reducing the risk of operation and achieving the purpose of protecting the personal safety of the operator, in addition, the subsequent damaged area after the service life is repaired more quickly, and the operation cost and operation time are greatly reduced.

[0040] In summary, the technical scheme of the application solves the problems in the prior art that as the service life increases, more and more parts of the underwater part of the floating platform are damaged and need to be repaired, but the platform structure is complex, the position of the area to be repaired is uncertain, and the protection current required by the repair area is different. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical scheme in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0042] Figure 1 It is a front view of the application;

[0043] Figure 2 It is a side view of the application;

[0044] Figure 3 It is a schematic view of the underwater plug-in electric connector-based cathodic protection quick repair device of the application;

[0045] Figure 4 It is a structure view of the underwater plug-in electric connector socket.

[0046] Figure 5 Structure diagram of the reference electrode of the application and the underwater plug-in electrical connector plug connection;

[0047] Figure 6 Structure diagram of the rod-shaped auxiliary anode of the application and the plug-in electrical connector plug connection;

[0048] Figure 7 Structure diagram of the sealing device of the application;

[0049] Figure 8 A-A view of the application Figure 7

[0050] Figure 9 Structure schematic diagram of embodiment 2 of the application

[0051] Figure 10 A-A view of the application Figure 9

[0052] In the figure: 1, wire laying tensioning device 2, composite cable 3, floating support platform 4, sealing device 5, underwater plug-in electrical connector socket 5, underwater plug-in electrical connector plug 7, rod-shaped auxiliary anode 8, reference electrode 9, current monitoring sensor 10, potential monitoring sensor 11, end connection module 12, underwater plug-in electrical connector protection frame 13, waterproof junction box 14, current control equipment 15, potential monitoring equipment 16, intermediate connection module 17, waterproof joint 18, preset underwater plug-in electrical connector socket 19, underwater plug-in electrical connector socket protection cap 20, underwater plug-in electrical connector socket tail terminal post 21, underwater plug-in electrical connector plug pin 22, sealing device sealing ring 23, sealing device wiring port 24, composite cable through port 25, sealing device fastening screw 26, internal glue filling 27, anticorrosive coating peeling area 28, sacrificial anode 29, sacrificial anode failure area. DETAILED DESCRIPTION

[0053] It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other without conflict. The application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0054] ​​In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The following description of at least one example embodiment is merely illustrative in nature and is in no way limiting on the application or its applications or uses. Based upon a review of the embodiments contained herein, all other embodiments that are apparent to those of ordinary skill in the art, and to practitioners thereof, in which equivalent steps, methodologies, and ingredients are substituted for those disclosed and described herein, and are intended to be within the scope of the application.

[0055] It is to be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0056] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the application unless otherwise specifically stated. It is to be understood that the drawings are not necessarily to scale as the dimensions of the parts shown are for the clarity of presentation and are shown exaggerated in relation to each other. The techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as if the discussion were fully conveyed. In all examples shown and discussed herein, any particular value is to be interpreted as merely an example, and not a limitation. Thus, other examples of example embodiments can have different values. It is to be noted that like reference numerals and letters refer to like items in the following drawings and that, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0057] In the description of the present application, it needs to be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are usually based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, without the opposite indication, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the scope of protection of the present application: the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component.

[0058] For the purposes of this description, spatially relative terms, such as "above", "below", "up", "down", "between", "within", "left", "right", "front", "back", "upper", "lower", "horizontal", "vertical", "above", "below", "up", "down", "top", "bottom", "side", "end", etc., are intended to describe the orientation of one device or feature relative to another device or feature as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. For example, if a device is described as "above" or "up" another device or structure, it can be oriented "below" or "down" the other device or structure when placed in another orientation. Similarly, if a device is described as "between" two other devices or structures, it can be oriented "between", "above", or "below" the other devices or structures. Accordingly, the exemplary terms "above" and "below" can encompass both orientations "above" and "below". The devices can also be oriented in other ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0059] In addition, it should be noted that the use of "first", "second", etc. words to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0060] As shown in the figure, the present application provides a kind of based on underwater plug-in electrical connector cathodic protection quick repair device, comprising: pay-off tensioning device 1, composite cable 2, potential monitoring sensor 10 end connection module 11, waterproof junction box 13, current control equipment 14, potential monitoring equipment 15 and intermediate connection module 16;The potential monitoring sensor 10 and potential monitoring equipment 15 of described are arranged on floating support platform 3;Composite cable 2 is wound on pay-off tensioning device 1, one end is connected with current control equipment 14 and potential monitoring equipment 15 in waterproof junction box 13, and the other end of the end is provided with end connection module 11, for fixedly installed on the bottom of floating support platform 3;The middle part of composite cable 2 is provided with a plurality of intermediate connection modules 16, for fixed connection with floating support platform 3;

[0061] A plurality of underwater plug-in electrical connector sockets 5 are provided on the composite cable 2;The underwater plug-in electrical connector socket 5 can be inserted with the underwater plug-in electrical connector plug 6;One of the rod-shaped auxiliary anode 7 and the reference electrode 8 is separately assembled on the underwater plug-in electrical connector plug 6;A plurality of preset underwater plug-in electrical connector sockets 18 are further provided on the composite cable 2;The sealing device 4 with waterproof function is further provided on the composite cable 2 to seal the underwater plug-in electrical connector socket 5, the underwater plug-in electrical connector plug 6 and the preset underwater plug-in electrical connector socket 18.

[0062] The sealing device 4 is provided on the composite cable 2 and is electrically connected with the internal core wire of the composite cable 2.

[0063] The underwater plug-in electrical connector socket 5 is sequentially electrically connected with different core wires inside the composite cable 2 and records; the core wires electrically connected with the underwater plug-in electrical connector sockets 5 spaced from each other in the first end of the composite cable 2 are connected with the terminal box of the data acquisition card device on the potential monitoring equipment 15, and the remaining internal core wires electrically connected with the underwater plug-in electrical connector sockets 5 spaced from each other in the first end of the composite cable 2 are connected with the current control equipment 14 in the waterproof junction box 13; the spacing between the adjacent two underwater plug-in electrical connector sockets 5 is 2-5 meters.

[0064] The negative pole of the current control equipment 14 is connected with the offshore platform through the ground wire, and the positive pole is electrically connected with the underwater plug-in electrical connector sockets 5 spaced from each other in the first end of the composite cable 2.

[0065] The water pressure resistance of the sealing device 4 connecting the composite cable 2 and the underwater plug-in electrical connector socket 5 is greater than 1.5Mpa.

[0066] The partial water pressure resistance of the underwater plug-in electrical connector plug 6 and the underwater plug-in electrical connector socket 5 is greater than 10Mpa.

[0067] The rod-shaped auxiliary anode 7 is mounted on the underwater plug-in electrical connector plug 6 through the waterproof joint 13; the reference electrode 8 is mounted on the underwater plug-in electrical connector plug 6 through the waterproof joint 13.

[0068] The underwater plug-in electrical connector socket protection cap 19 is screwed on the preset underwater plug-in electrical connector socket 18 for standby.

[0069] The repair method based on the underwater plug-in electrical connector cathodic protection rapid repair device includes the following steps:

[0070] 1. The overall potential of the platform is monitored by the potential monitoring sensor 10 installed on the offshore floating platform, and the real-time feedback information is fed back by the potential monitoring software. When the platform monitoring point potential does not meet the specification -800mV~ -1150mV Ag / AgCl, the potential monitoring software will issue an alarm, and the software will calculate through big data to preliminarily judge the platform failure area. The diver or ROV enters the water to check and determine the sacrificial anode failure area 29 or the position of the anticorrosive coating falling off, and the composite cable repair device is arranged around;

[0071] 2. The position of the underwater plug-in electrical connector socket 5 on the composite cable 2 is calculated and designed, the underwater plug-in electrical connector plug 6 with the rod-shaped auxiliary anode 7 and the reference electrode 8 is inserted into the underwater plug-in electrical connector socket 5, and the underwater plug-in electrical connector socket protection cap 19 is screwed on the underwater plug-in electrical connector socket 5 which is not inserted for standby;

[0072] 3, the designed composite cable 2 is connected to the waterproof junction box 13, and the internal core wires of the composite cable 2 are respectively connected to the current control device 14 and the potential monitoring device 15 according to the design; the composite cable 2 bearing body is wound on the pay-off tensioning device 1, and the other end is connected to the sacrificial anode 28 protection frame through the end connection module 11;

[0073] 4, the current control device 14 is used to electrify the rod-shaped auxiliary anode 7 to achieve the impressed current cathodic protection of the platform;

[0074] 5, the potential monitoring sensor 10 installed on the offshore platform is used for monitoring the potential of the platform, and the reference electrode 8 on the underwater plug-in electric connector plug 6 connected with the composite cable 2 can also be used as a monitoring point to monitor the overall potential of the offshore platform; the current control device 14 is used to change the current size of the rod-shaped auxiliary anode 7, and the potential monitoring software is used to feed back data in real time to determine that the quick repair device is effective;

[0075] 6, as the service life of the offshore platform increases, other positions on the outer surface of the underwater structure of the offshore platform may successively appear sacrificial anode failure areas 29 or anticorrosive coating shedding areas 27, at this time, a diver can insert the underwater plug-in electric connector plug 6 with the rod-shaped auxiliary anode 7 and the reference electrode 8 into the underwater plug-in electric connector socket 18 near the failure area position;

[0076] 7, the current control device 14 is used to electrify the newly inserted rod-shaped auxiliary anode 7 to achieve the impressed current cathodic protection of the platform;

[0077] 8, the potential monitoring sensor 10 installed on the offshore platform and the reference electrode 8 of the underwater plug-in electric connector plug are used to monitor the overall potential of the platform, and the potential monitoring software is used to feed back data in real time to determine that the quick repair device is effective.

[0078] Embodiment 1

[0079] As shown in the figure, the application provides a cathodic protection quick repair device and repair method based on an underwater plug-in electric connector; due to ship collision, coating aging and shedding, and large typhoon causing local coating damage on the surface of the offshore platform; through the actual sea condition test on the scaled model, the platform damage rate is preliminarily assumed to be 32%, that is, large-area shedding, to verify the reliability of the cathodic protection quick repair device based on the underwater plug-in electric connector. The specific repair steps are as follows:

[0080] 1. The overall potential of the platform is monitored using a potential monitoring sensor 10 installed on the offshore floating platform 7, with real-time feedback provided by the potential monitoring software. If the platform's potential distribution is between -670 and -720 mV, the monitoring software will trigger an alarm. The software will then calculate and determine the location of coating damage. Divers will then enter the water to inspect the damage and deploy a cathodic protection rapid repair device using underwater pluggable electrical connectors.

[0081] 2. Connect one end of the designed composite cable 2 to the waterproof junction box 13. The internal core wires of the composite cable 2 are connected to the current control device 14 and the potential monitoring device 15. The cable body is wrapped around the pay-off tensioning device 1, and the other end is connected to the sacrificial anode protection frame 17 near the local coating damage through the end connection module 11.

[0082] 3. N underwater pluggable electrical connector sockets 5 are provided on the composite cable 2. Some sockets are used for this quick repair, and the other sockets are preset on the composite cable 2 for subsequent repairs. The distance between each underwater pluggable electrical connector socket 5 should be 2-5 meters.

[0083] 4. Connect the plug of the underwater pluggable electrical connector connected to the rod-shaped auxiliary anode 7 to the underwater pluggable electrical connector socket 5 connected to the current control device 14 on the composite cable 2. Connect the plug of the underwater pluggable electrical connector connected to the reference anode to the underwater pluggable electrical connector socket 5 connected to the voltage monitoring device on the composite cable 2. In this way, the rod-shaped auxiliary anode 7 can be directly energized by the current control device 14, thereby achieving impressed current cathodic protection for the platform.

[0084] 5. Install an underwater pluggable electrical connector socket protective cap 19 on the preset underwater pluggable electrical connector socket 5 that is not used in this repair to protect the internal conductor of the underwater pluggable electrical connector socket 5 from corrosion by the marine environment;

[0085] 6. Modify the amount of current supplied by the current control device 14 to the rod-shaped auxiliary anode 7 and set it to 500 mA to determine the change in platform potential.

[0086] 7. The platform potential is monitored by the potential monitoring sensor 10 installed on the offshore floating platform 7, and the monitoring point is the potential monitoring sensor 10 arranged on the platform itself. The reference electrode 8 connected to the underwater plug-in electrical connector plug 6 connected to the composite cable 2 can also be connected into the overall potential monitoring as a monitoring point. The test results show that by emitting a current of 500 mA through the rod-shaped auxiliary anode 7, it is found that the potential of the model electrode (Ag / AgCl) is significantly reduced from an average of -697.67 mV to -857.13 mV, and the potential around the coating damage point is significantly reduced from -652 mV to -893 mV, which meets the experimental expectations, and the underwater plug-in electrical connector-based cathodic protection rapid repair device is fast and reliable.

[0087] Example 2

[0088] As shown in the figure, (based on example 1, ) the application also provides a cathodic protection rapid repair device and repair method based on an underwater plug-in electrical connector; due to ship collision, coating aging and falling off, and super typhoon causing local coating damage on the surface of the floating platform; due to ship collision, anode consumption, or marine organisms attached to the surface of the sacrificial anode, causing the sacrificial anode to fail. Through actual sea condition simulation tests on the scaled model, the coating damage simulation is based on example 1 (i.e. 32% coating damage rate), and the two sacrificial anodes of the test platform are closed, i.e. the two sacrificial anodes are disabled, to simulate the sacrificial anode consumption or failure as the service life increases, to verify the reliability of the underwater plug-in electrical connector-based cathodic protection rapid repair device; the specific repair steps are as follows:

[0089] 1. At this time, the overall platform potential is monitored by the potential monitoring instrument 4 installed on the offshore floating platform 7, and the real-time feedback information is obtained through the potential monitoring software; it is found that the overall platform potential is distributed between -712 mV and -765 mV, at this time the potential monitoring instrument 4 will alarm, the software will calculate and judge the failure reason, according to the potential near the sacrificial anode, it is judged that the sacrificial anode has failed; through personnel or ROV water entry inspection, the coating damage position is determined, and the coating damage condition is determined;

[0090] 2. Send a diver to plug the plug of the underwater plug-in electrical connector connected with the bar-shaped auxiliary anode 7 and the plug of the underwater plug-in electrical connector connected with the reference anode on the quick repair device arranged near the failed sacrificial anode in Embodiment 1. At this time, the plug of the underwater plug-in electrical connector connected with the bar-shaped auxiliary anode 7 is connected with the underwater plug-in electrical connector socket 5 on the composite cable 2 connected with the current control device 14, and the plug of the underwater plug-in electrical connector connected with the reference anode is connected with the underwater plug-in electrical connector socket 5 on the composite cable 2 connected with the voltage monitoring device, so that the bar-shaped auxiliary anode 7 can be directly powered on by the current control device 14, and the platform is cathodically protected by impressed current.

[0091] 3. The current control device 14 is used to power on different bar-shaped auxiliary anodes 7 to set 150 mA to judge the potential change of the platform.

[0092] 4. The potential monitoring sensor 10 installed on the offshore platform 7 is used to monitor the potential of the platform, and the reference electrode 8 connected with the plug 6 of the underwater plug-in electrical connector of the composite cable 2 can also be connected into the overall potential monitoring. The test results show that in this case, by powering on 150 mA of current to the bar-shaped auxiliary anode 7 near the failed sacrificial anode, the electrode potential (Ag / AgCl) near the sacrificial anode is significantly reduced from -712 mV to -921 mV, and the overall average protection potential of the platform is significantly reduced from -739 mV to 867 mV, which meets the experimental expectation, and the quick repair device for cathodic protection based on the underwater plug-in electrical connector is quick and reliable.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A rapid repair device for cathodic protection of underwater pluggable electrical connectors, comprising: A wire-paying and tensioning device (1), a composite cable (2), a potential monitoring sensor (10), an end connection module (11), a waterproof junction box (13), a current control device (14), a potential monitoring device (15), and an intermediate connection module (16); the potential monitoring sensor (10) and the potential monitoring device (15) are arranged on a floating support platform (3); the composite cable (2) is wound on the wire-paying and tensioning device (1), one end of which is connected to the current control device (14) and the potential monitoring device (15) in the waterproof junction box (13), and the other end of which is provided with an end connection module (11) for being fixedly mounted on the bottom of the floating support platform (3); a plurality of intermediate connection modules (16) are provided in the middle of the composite cable (2) for being fixedly connected to the floating support platform (3); the composite cable is characterized in that: The composite cable (2) is provided with a plurality of underwater pluggable electrical connector sockets (5); The underwater pluggable electrical connector socket (5) can be plugged into an underwater pluggable electrical connector plug (6); The underwater pluggable electrical connector plug (6) is separately equipped with one of a rod-shaped auxiliary anode (7) and a reference electrode (8); The composite cable (2) is also provided with a plurality of preset underwater pluggable electrical connector sockets (18); The composite cable (2) is also provided with a sealing device (4) with a waterproof function for sealing the underwater pluggable electrical connector socket (5), the underwater pluggable electrical connector plug (6), and the preset underwater pluggable electrical connector socket (18).

2. The cathodic protection rapid repair device for underwater pluggable electrical connectors according to claim 1, characterized in that: The sealing device (4) is arranged on the composite cable (2) and is electrically connected to the inner core wire of the composite cable (2).

3. The cathodic protection rapid repair device for underwater pluggable electrical connectors according to claim 1, characterized in that: The underwater pluggable electrical connector socket (5) is electrically connected to different core wires inside the composite cable (2) in sequence and records the connection; The core wires at the head end of the composite cable (2) electrically connected to the mutually spaced underwater plug-in electrical connector sockets (5) are connected to the terminal box of the data acquisition card device on the potential monitoring device (15), and the internal core wires at the head end of the remaining composite cables (2) electrically connected to the mutually spaced underwater plug-in electrical connector sockets (5) are connected to the current control device (14) in the waterproof junction box (13); The distance between two adjacent underwater pluggable electrical connector sockets (5) is 2-5 meters.

4. The cathodic protection rapid repair device for underwater pluggable electrical connectors according to claim 1, characterized in that: The negative pole of the current control device (14) is connected to the ocean platform via a ground wire, and the positive pole is electrically connected to the underwater plug-in electrical connector sockets (5) spaced apart from each other at the head end of the composite cable (2).

5. The cathodic protection rapid repair device for underwater pluggable electrical connectors according to claim 4, characterized in that: The sealing device (4) for connecting the composite cable (2) and the underwater pluggable electrical connector socket (5) has a water pressure resistance greater than 1.5 MPa.

6. The cathodic protection rapid repair device for underwater pluggable electrical connectors according to claim 1, characterized in that: The underwater pluggable electrical connector plug (6) and the underwater pluggable electrical connector socket (5) have a water pressure resistance greater than 10 MPa.

7. The cathodic protection rapid repair device for underwater pluggable electrical connectors according to claim 1, characterized in that: The rod-shaped auxiliary anode (7) is mounted on the underwater pluggable electrical connector plug (6) via a waterproof joint (13); The reference electrode (8) is mounted on the underwater pluggable electrical connector plug (6) via a waterproof connector (13).

8. The cathodic protection rapid repair device for underwater pluggable electrical connectors according to claim 1, characterized in that: The preset underwater plug-in electrical connector socket (18) is screwed with an underwater plug-in electrical connector socket protection cap (19) for standby use.

9. A repair method based on an underwater pluggable electrical connector cathodic protection rapid repair device, characterized in that: The repair method based on the underwater pluggable electrical connector cathodic protection rapid repair device comprises the following steps: 1) The overall potential of the platform is monitored by a potential monitoring sensor (10) installed on the offshore floating platform, and information is fed back in real time through the potential monitoring software. When the potential of the platform monitoring point does not meet the standard of -800mV to -1150mV (Ag / AgCl), the potential monitoring software will issue an alarm. The software will make a preliminary judgment on the failure area of ​​the platform through big data calculation. Divers or ROVs will enter the water for inspection to determine the sacrificial anode failure area (29) or the location where the anti-corrosion coating has fallen off, and a composite cable repair device will be deployed around it. 2) By calculating and designing the position of the underwater pluggable electrical connector socket (5) on the composite cable (2), the underwater pluggable electrical connector plug (6) with the rod-shaped auxiliary anode (7) and the reference electrode (8) is plugged into the underwater pluggable electrical connector socket (5), and the underwater pluggable electrical connector socket protective cap (19) is screwed onto the unplugged underwater pluggable electrical connector socket (5) and kept for backup; 3) Connect the head end of the designed composite cable (2) to the waterproof junction box (13), and connect the internal core wires of the composite cable (2) to the current control device (14) and the potential monitoring device (15) respectively according to the design; the composite cable (2) carrying body is wound on the wire tensioning device (1), and the other end is connected to the sacrificial anode (28) protection frame through the end connection module (11); 4) Using the current control device (14) to energize the rod-shaped auxiliary anode (7) to provide impressed current cathodic protection for the platform; 5) The potential of the platform is monitored by a potential monitoring sensor (10) installed on the marine floating platform. Secondly, the reference electrode (8) on the underwater plug-in electrical connector plug (6) connected to the composite cable (2) can also be used as a monitoring point to monitor the overall potential of the marine floating platform; the current control device (14) changes the current size of the rod-shaped auxiliary anode (7), and the potential monitoring software provides real-time feedback data to determine that the rapid repair device is effective; 6) As the marine service life increases, sacrificial anode failure areas (29) or anti-corrosion coating peeling areas (27) may appear in other locations on the outer surface of the underwater structure of the marine floating platform. At this time, divers can be sent to plug underwater pluggable electrical connector plugs (6) with rod-shaped auxiliary anodes (7) and reference electrodes (8) into the preset underwater pluggable electrical connector sockets (18) near the failure areas. 7) Using the current control device (14) to energize the newly inserted rod-shaped auxiliary anode (7) to provide impressed current cathodic protection for the platform; 8) The overall potential of the platform is monitored by a potential monitoring sensor (10) installed on the ocean floating platform and a reference electrode (8) of an underwater plug-in / unpluggable electrical connector plug, and data is fed back in real time through the potential monitoring software to determine whether the quick repair device is effective.

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