Construction method and structure of steel pipe pile remote type cathode protection system

Abstract

The invention relates to the technical field of ocean engineering corrosion prevention, in particular to a construction method and structure of a steel pipe pile remote type cathode protection system.According to the construction method of the steel pipe pile remote type cathode protection system, sacrificial anode block sets are prefabricated and assembled in advance, and sinking installation of the sacrificial anode block sets is completed through a crane and sinking assisting components; the installation of the cathode protection system is completed without diving operation, the installation risk is small, the efficiency is high, the construction cost can be reduced, meanwhile, the sacrificial anode block group is prefabricated and assembled in advance in a prefabricating field, the assembling quality can be ensured, the use effect of the cathode protection system is ensured, and in addition, the structure is simple. And the underwater mounting position of the sacrificial anode block group is determined in cooperation with GPS positioning, so that the mounting precision of the sacrificial anode block group can be ensured, and the use effect of the cathode protection system is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of marine engineering anticorrosion, and in particular to a construction method and structure of a steel pipe pile remote cathodic protection system. Background Art

[0002] Sacrificial anode block cathodic protection is the main electrochemical anti-corrosion method for marine engineering steel pipe piles. However, traditional anode block installation methods such as underwater welding and clamp fixation require long equipment occupancy time, high rental fees for diving auxiliary equipment, high labor costs for diving operations, and huge safety risks for diving operations in some sea areas with harsh hydrological conditions. There are large potential construction hazards and low construction efficiency. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the traditional anode block installation method in the prior art, such as high risk, high cost and low efficiency of diving operation, and to provide a construction method for a steel pipe pile remote cathodic protection system.

[0004] In a first aspect, the present invention provides a construction method for a steel pipe pile remote cathodic protection system, comprising: Step 1, welding a cathode cable on a steel pipe pile, and connecting the cathode cable to a junction box; Step 2, prefabricating and assembling a sacrificial anode block group, wherein an anode cable is welded to the sacrificial anode block group, and a plurality of sinking aid components are tied to the anode cable at intervals; Step 3, connecting all sinking aid components on the anode cable through ropes, and keeping the anode cable looser than the ropes; Step 4: Determine the underwater installation position of the sacrificial anode block group by GPS; Step 5: lift the sacrificial anode block group by a crane, lower it to the installation position, and after the sinking aid component is sunk and installed by synchronously pulling it by the rope, pull the anode cable above the water surface and connect it to the junction box.

[0005] The invention provides a construction method for a remote cathodic protection system for steel pipe piles. By prefabricating and assembling a sacrificial anode block group in advance, a crane and a sinking-aiding component are used to complete the sinking installation of the sacrificial anode block group, thereby achieving installation of the cathodic protection system without the need for diving operations. The installation risk is small, the efficiency is high, and it is beneficial to reduce construction costs. At the same time, the sacrificial anode block group is prefabricated and assembled in advance at a prefabrication site, which can also ensure its assembly quality and ensure the use effect of the cathodic protection system. In addition, the underwater installation position of the sacrificial anode block group is determined in conjunction with GPS positioning, which can ensure the installation accuracy of the sacrificial anode block group.

[0006] Preferably, the method further comprises welding at least two steel pipe piles together through connecting steel bars to form a cathode steel pipe pile group, wherein the connecting steel bars are provided with a protective layer, so that multiple steel pipe piles can participate in the cathode reaction at the same time.

[0007] Preferably, in step 1, the cathode cable is welded to the inner wall of the steel pipe pile before pouring the pile core concrete and is isolated from the pile core steel cage by an insulating pad, or the cathode cable is welded to the outer wall of the steel pipe pile and is sealed by a joint protection box.

[0008] Preferably, in step 1, two cathode cables are arranged side by side, and the two cathode cables are respectively connected to the steel pipe pile by needle brazing; in step 2, at least one anode cable is welded to the sacrificial anode block group, so that multiple cathode cables are mutually redundant, ensuring the long-term effectiveness of the cathodic protection system.

[0009] Preferably, the sinking aid component comprises a concrete block, on which at least one pipe and at least one steel rod are embedded, and the steel rod extends from both sides of the concrete block; in step 2, the anode cable passes through the pipe and is tied to the steel rod; in step 3, the rope is tied to the steel rod. The sinking aid component has a simple structure and can be prefabricated in advance. The sinking aid component can be easily set on the anode cable by tying, and the relative position between adjacent sinking aid components can be adjusted according to actual conditions.

[0010] Preferably, in step 2, a buffer ring is provided on the sacrificial anode block group, and the anode cable is wound around the buffer ring for several turns and fixed in position. The length of the anode cable is redundantly reserved on the sacrificial anode block group. This prevents shear wear from occurring at the contact position between the anode cable and the sacrificial anode block group during and after the sacrificial anode block group is lowered, thereby reducing the life of the anode cable or even directly damaging the anode cable.

[0011] Preferably, in step 5, the first hook of the crane is connected to the sacrificial anode block group through a steel wire rope and an automatic unhooking shackle, and the second hook of the crane hooks the rope and the above-water installation end of the anode cable, and after sinking the sacrificial anode block group to the bottom of the water, the automatic unhooking shackle is released, and the second hook guides the sinking aid components to sink into place one by one and pulls the anode cable above the water surface. The sinking installation process of the sacrificial anode block group is completed by the cooperation of the two hooks of the crane.

[0012] Preferably, during the sinking process of the sacrificial anode block group, the relative position between the sacrificial anode block group and the steel pipe pile is adjusted by a traction rope, so as to achieve accurate determination of the installation position of the sacrificial anode block group.

[0013] Preferably, in step 5, the anode cable located above the water surface is confined on a steel pipe pile by a plurality of pipe clamps to prevent the anode cable from being damaged by water flow and wind swaying.

[0014] In a second aspect, the present invention provides a steel pipe pile structure, which adopts a steel pipe pile remote cathodic protection system construction method as described above, and includes a plurality of steel pipe piles, a sacrificial anode block group, a junction box, an anode cable, a cathode cable and a plurality of sinking aid components; A plurality of the steel pipe piles are connected by welding through connecting steel bars to form a cathode steel pipe pile group; The sacrificial anode block group is sunk to the bottom of the water and spaced apart from the steel pipe piles; The junction box is arranged on the upper structure of the steel pipe pile; One end of the cathode cable is welded to the steel pipe pile, and the other end is connected to the junction box; One end of the anode cable is welded to the sacrificial anode block group, and the other end is connected to the junction box. The underwater part of the anode cable is limited and laid on the bottom of the water by a plurality of sinking aid components, and the above-water part of the anode cable is limited to the outer wall of the steel pipe pile by a plurality of pipe clamps.

[0015] A steel pipe pile remote cathodic protection system structure of the present invention has low construction risk, high efficiency and low cost by adopting the above-mentioned construction method, which can ensure the use effect of the cathodic protection system and realize effective anti-corrosion protection of the steel pipe piles. At the same time, the laying and fixing of the underwater anode cable are assisted by the sinking auxiliary component, and the above-water part is relatively fixed to the steel pipe pile by the pipe clamp, so that the cathodic protection system structure is stable and the use effect is ensured.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides a construction method for a remote cathodic protection system of a steel pipe pile, which prefabricates and assembles a sacrificial anode block group in advance, and uses a crane and a sinking auxiliary component to complete the sinking installation of the sacrificial anode block group, thereby achieving the installation of the cathodic protection system without diving operations, with low installation risk, high efficiency, and is conducive to reducing construction costs; 2. The present invention provides a construction method for a remote cathodic protection system for steel pipe piles, which can ensure the assembly quality and the use effect of the cathodic protection system by prefabricating and assembling the sacrificial anode block group in advance in the prefabrication yard; 3. The present invention provides a construction method for a remote cathodic protection system for steel pipe piles, which can ensure the installation accuracy of the sacrificial anode block group by cooperating with GPS positioning to determine the underwater installation position of the sacrificial anode block group; 4. The present invention provides a steel pipe pile structure. By adopting the above-mentioned construction method, the construction risk is small, the efficiency is high and the cost is low, the use effect of the cathodic protection system can be ensured, and effective anti-corrosion protection of the steel pipe pile can be achieved; 5. The present invention provides a steel pipe pile structure, which assists the laying and fixing of the underwater anode cable through a sinking aid component, and the above-water part is relatively fixed to the steel pipe pile through a pipe clamp, so that the cathodic protection system structure is stable and the use effect is ensured. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 It is a process flow diagram of a construction method of a remote cathodic protection system for steel pipe piles according to the present invention; Figure 2 This is a schematic diagram of the structure in which two steel pipe piles are connected by welding through connecting steel bars in Example 1; Figure 3 This is a schematic diagram of the structure in which the cathode cable is arranged in the steel pipe pile in Example 1; Figure 4 This is a schematic diagram of the structure in which the cathode cable is arranged outside the steel pipe pile in Example 1; Figure 5 It is a structural schematic diagram of the sacrificial anode block group, anode cable and sinking aid component in the embodiment 1; Figure 6 is a schematic structural diagram of the sacrificial anode block group in Example 1; Figure 7 This is a structural schematic diagram of the anode cable and the sinking aid component being tied and connected in Example 1; Figure 8 This is a schematic diagram of the state of the crane lowering the sacrificial anode block group in Example 1; Fig. 9 This is a schematic diagram of the state where the sacrificial anode block group in Example 1 is lowered to the bottom of the water; Fig.10 This is a schematic diagram of the state in which the second hook guides the sinking aid component to sink in Example 1; Fig.11 This is a schematic diagram of the state where the anode cable is fixed on the steel pipe pile by a pipe clamp in Example 1; Fig.12 This is a structural schematic diagram of a steel pipe pile structure of Example 2.

[0018] Markings in the figure: 1- cathode cable, 11- insulating support pad, 12- joint protection box, 2- junction box, 3- sacrificial anode block group, 31- buffer ring, 32- steel frame structure, 33- lifting ear, 34- cable sealing box, 35- anode block, 36- reinforced concrete structure plate, 4- anode cable, 5- sinking aid component, 51- concrete block, 52- pipe fittings, 53- steel rod, 6- rope, 7- connecting steel bar, 8- crane, 81- first hook, 82- steel wire rope, 83- automatic unhooking shackle, 84- second hook, 85- traction rope, 9- pipe clamp, 10- steel pipe pile. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with specific embodiments. However, it should not be understood that the scope of the above subject matter of the present invention is limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0020] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or position relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all expressions based on the orientation or position relationship shown in the drawings, or are the orientation or position relationship when the invented product / equipment / device is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the present invention or simplifying the description in the specific embodiments, so as to facilitate the technicians to quickly understand the scheme, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0021] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present invention.

[0022] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0023] In addition, in the description of the embodiments of the present invention, "several", "plurality" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0024] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0025] Example 1 A construction method for a steel pipe pile remote cathodic protection system, comprising: Step 1, welding the cathode cable 1 on the steel pipe pile 10, and connecting the cathode cable 1 to the junction box 2; Step 2, prefabricate and assemble a sacrificial anode block group 3, anode cables 4 are welded on the sacrificial anode block group 3, and a plurality of sinking aid components 5 are tied to the anode cables 4 at intervals; Step 3, connecting all sinking aid components 5 on the anode cable 4 through the rope 6, and keeping the anode cable 4 looser than the rope 6; Step 4: Determine the underwater installation position of the sacrificial anode block group 3 by GPS; Step 5: lift the sacrificial anode block group 3 by the crane 8, lower it to the installation position, and pull the sinking aid component 5 down synchronously by the rope 6. After the installation, pull the anode cable 4 above the water surface and connect it to the junction box 2.

[0026] A method for constructing a remote cathodic protection system for a steel pipe pile in the present embodiment is described by taking the construction of a remote cathodic protection system for a marine environment steel pipe pile 10 as an example. By prefabricating and assembling the sacrificial anode block group 3 in advance, a crane 8 and a sinking aid component 5 are used to complete the sinking installation of the sacrificial anode block group 3, thereby achieving the installation of the cathodic protection system without the need for diving operations. The installation risk is small, the efficiency is high, and it is beneficial to reduce the construction cost. At the same time, the sacrificial anode block group 3 is prefabricated and assembled in advance at the prefabrication site, which can also ensure its assembly quality and ensure the use effect of the cathodic protection system. In addition, the underwater installation position of the sacrificial anode block group 3 is determined in conjunction with GPS positioning, which can ensure the installation accuracy of the sacrificial anode block group 3 and is suitable for the installation of cathodic protection systems in harsh hydrological environments.

[0027] like Figure 1As shown, this embodiment takes the construction of a remote cathodic protection system of a high-pile wharf as an example to demonstrate that the cathode cable 1 can be constructed after the pile sinking is completed, and the anode part can be installed after the concrete pouring of the wharf superstructure construction is completed. The sacrificial anode block group 3 is prefabricated in the prefabrication yard and the anode cable 4 is welded and installed thereon. During installation, the sacrificial anode block group 3 is transported to the vicinity of the installation position by a flat barge, and the sinking installation and the fixing of the anode cable 4 are assisted by a crane 8 barge. After the installation is completed, the cathode cable 1 and the anode cable 4 are connected to the explosion-proof junction box 2, and the voltage is detected in the junction box 2 to ensure the installation quality. The operation is streamlined, and the construction efficiency can be accelerated. Compared with the traditional construction method of only completing 2-3 underwater welding and installation of anode blocks 35 per day, a single sinking can complete the installation of multiple anode blocks 35, and the construction efficiency is significantly improved. In addition, no decompression chamber or deep diving equipment is required during the construction process. After the installation is completed, the voltage in the junction box is detected for monitoring, which avoids diving operations such as underwater photography, avoids or reduces the construction cost, and has the effect of reducing costs and increasing efficiency.

[0028] In an optional implementation, before installing the sacrificial anode block group 3, the installation position of the sacrificial anode block group 3 and the sinking aid component 5 can be located by GPS, and then the lowering work can be carried out after positioning, and a period of time with good sea conditions can be selected to ensure that the installation accuracy of the sacrificial anode block group 3 and the sinking aid component 5 is within 50 cm.

[0029] In one or more embodiments, the method further comprises welding at least two steel pipe piles 10 together through connecting steel bars 7 to form a cathode steel pipe pile group 10, wherein the connecting steel bars 7 are provided with a protective layer, such as Figure 2 shown.

[0030] In an optional embodiment, the connecting steel bar 7 can be a conventional steel bar with a diameter of 16 mm. The two ends of the connecting steel bar 7 are respectively welded to adjacent steel pipe piles 10 to form a wire network connecting multiple steel pipe piles 10, so that the multiple steel pipe piles 10 form a cathode steel pipe pile group 10 and participate in the cathode reaction together.

[0031] In an optional embodiment, the connecting steel bar 7 can be welded to the steel pipe pile 10 at its end, and preferably the end of the connecting steel bar 7 is welded to the top pipe mouth of the steel pipe pile 10 to ensure electrical continuity between the multiple steel pipe piles 10 to be protected; the connecting steel bar 7 can be set after the construction of the steel pipe pile 10 is completed and before the construction of the remaining upper structures of the steel pipe piles 10, and the connecting steel bar 7 can be embedded in the post-poured concrete of the upper structure of the steel pipe pile 10.

[0032] In an optional embodiment, an anti-corrosion coating may be coated on the connecting steel bars 7 for protection.

[0033] In one or more embodiments, in step 1, the cathode cable 1 can be welded to the inner wall of the steel pipe pile 10 before the concrete of the pile core is poured, and isolated from the pile core steel cage by an insulating support pad 11, such as Figure 3 shown.

[0034] In an optional embodiment, the cathode cable 1 is a copper cable, which can be welded to the inner wall of the steel pipe pile 10 near the top pipe mouth through a copper terminal and pin brazing. After confirming that the weld is stable, the welding slag splashes, sharp edges or burrs are cleaned, and the welding points are coated with epoxy resin to provide an anti-corrosion coating. This welding process can ensure the electrical continuity between the cathode cable 1 and the steel pipe pile 10 by using pin brazing to make an electrical connection between the cathode cable 1 and the steel pipe pile 10, and utilize the characteristics of pin brazing that the stud bolts or pins can be connected to the metal pile without damaging the metal or affecting its integrity, thereby avoiding the welding process from having an adverse effect on the steel pipe pile 10.

[0035] In an optional embodiment, the insulating support pad 11 may be a structure provided between the pile core reinforcement cage and the cathode cable 1 to function as an abutment support pad.

[0036] In an optional embodiment, the insulating support pad 11 can be welded to the pile core steel cage, and the welding is performed when the pile core steel cage is prefabricated, and the installation is realized along with the arrangement of the pile core steel cage in the steel pipe pile 10, so as to reduce the direct welding operation on the steel pipe pile 10. Figure 3 shown.

[0037] In one or more embodiments, the cathode cable 1 can also be welded to the outer wall of the steel pipe pile 10 and sealed by a joint protection box 12, such as Figure 4 shown.

[0038] In an optional embodiment, the joint protection box 12 can be a box-shaped structure welded to the outer wall of the steel pipe pile 10, and the cathode cable 1 passes through the joint protection box 12. The end of the cathode cable 1 is welded to the steel pipe pile 10 inside the joint protection box 12 to ensure electrical continuity between the steel pipe pile 10 and the cathode cable 1.

[0039] In one or more embodiments, in step 1, two cathode cables 1 are arranged side by side, and the two cathode cables 1 are respectively connected to the steel pipe pile 10 by needle brazing. The multiple cathode cables 1 are mutually redundant to ensure the long-term effectiveness of the cathodic protection system. Figure 3 , Figure 4 shown.

[0040] In one or more embodiments, in step 2, the prefabricated Figure 5 The sacrificial anode block group 3 is tied with a sinking aid member 5, and at least one anode cable 4 is welded to the sacrificial anode block group 3. Figure 6shown.

[0041] In an optional embodiment, there can be two anode cables 4, the same number as the cathode cables 1, the two anode cables 4 are redundant, the two anode cables 4 can have the same laying path, or can be laid separately, and are preferably connected to the same junction box 2. During construction, the anode cable 4 is assisted by a sinking aid component and laid in a straight line between the sacrificial anode block group 3 and the steel pipe pile 10 until it approaches the steel pipe pile 10, and then extends from bottom to top along the outer wall of the steel pipe pile 10 to above the water surface, and is pulled from a reserved channel near the top of the steel pipe pile 10 to the upper junction box 2 for fixation.

[0042] In an optional embodiment, the anode cable 4 may be wrapped in a corrugated tube.

[0043] In an optional embodiment, a cable sealing box 34 may be provided on the sacrificial anode block group 3 to seal the connection portion between the anode cable 4 and the sacrificial anode block group 3 to ensure long-term electrical continuity between the anode cable 4 and the sacrificial anode block group 3 .

[0044] In an optional embodiment, the sacrificial anode block group 3 may include a steel frame structure 32, on which are provided a lifting lug 33, a counterweight casting cavity, a cable sealing box 34, a plurality of anode blocks 35 and a buffer ring 31. The steel frame structure 32 may be formed by connecting a plurality of steel members end to end to enclose a counterweight casting cavity, and a reinforced concrete structural plate 36 is cast in the counterweight casting cavity. The casting amount may be adjusted according to actual conditions to adjust the overall weight of the sacrificial anode block group 3 and to achieve stable setting of the sacrificial anode block group 3 at different water levels. A plurality of anode blocks 35 may be arranged on the steel frame structure 32 according to actual conditions. The anode block 35 is preferably an aluminum-zinc-indium alloy anode block 35 having a regular shape, which is convenient for stable setting on the steel frame structure 32 and to achieve completion of a plurality of anode blocks 3 in one construction. 5, improving the installation efficiency; the cable sealing box 34 can be welded to the steel structure of the sacrificial anode block group 3 in advance, and the anode cable 4 is inserted into the cable sealing box 34 through the cable gland, and is brazed with the steel structure of the sacrificial anode block group 3 in the cable sealing box 34. After welding, the cable sealing box 34 can be filled with epoxy resin to protect the welding points from corrosion. The part of the anode cable 4 outside the sealing box can be fixed by a clamp welded to the sacrificial anode block group 3 to avoid the anode cable 4 being cut off by the swaying and abrasion of the water flow at the gland. At the same time, it is preferred to wrap the gland with a hot melt hose and the clamp with a rubber pad; a plurality of water holes are distributed on the reinforced concrete structural plate 36; a plurality of limit columns for inserting into the seabed are provided at the bottom of the steel frame structural member 32, and a tip portion is provided at the bottom of the limit column.

[0045] In an optional embodiment, the junction box 2 can be an electrical box installed on the upper structure of the steel pipe pile 10. The cathode cable 1 is connected to the cathode terminal in the junction box 2 after passing through a preset PVC pipe, and the anode cable 4 is connected to the anode terminal in the junction box. The structure and setting position of the junction box 2 can be adjusted according to actual conditions.

[0046] In one or more embodiments, the sinking aid component 5 includes a concrete block 51, on which at least one pipe 52 and at least one steel rod 53 are embedded, the pipe 52 and the steel rod 53 are arranged in parallel, and the steel rod 53 extends from both sides of the concrete block 51; in step 2, the anode cable 4 passes through the pipe 52 and is tied to the steel rod 53; in step 3, the rope 6 is tied to the steel rod 53. The sinking aid component 5 has a simple structure and can be prefabricated in advance. The sinking aid component 5 can be easily set on the anode cable 4 by tying, and the relative positions of adjacent sinking aid components 5 can be adjusted according to actual conditions. Figure 7 shown.

[0047] In an optional embodiment, the sinking-aiding component 5 can be a concrete block 51 of a cubic structure, which can be embedded with a steel structure or other high-density materials according to actual conditions to increase the weight of a single sinking-aiding component 5. When prefabricated, the sinking-aiding component 5 is embedded with insulating pipes 52 and steel rods 53 along the length direction. The insulating pipes 52 are used to facilitate the passage of the anode cable 4, and the steel rods 53 are used to facilitate the binding and fixation of the anode cable 4. When in use, the anode cable 4 passes through the pipes 52 of the sinking-aiding component 5, and then is bound and fixed to the rods by cable ties to achieve the setting of the sinking-aiding component 5 on the anode cable 4 and prevent friction loss between the anode cable 4 and the edge of the sinking-aiding component 5.

[0048] In an optional implementation, the pipe 52 may be a PVC pipe or a corrugated pipe.

[0049] In an optional embodiment, the number and setting distance of the sinking-aiding components 5 can be determined after calculation based on the horizontal distance from the designed installation position of the sacrificial anode block group 3 to the steel pipe pile 10. Preferably, the sinking-aiding components 5 are evenly distributed on the anode cable 4 with a spacing of 1m. The weight of the sinking-aiding components 5 can be calculated in advance based on the water depth data to ensure that the sinking-aiding components 5 can stably confine the anode cable 4 to the bottom of the water and are not affected by the water flow and move.

[0050] In an optional embodiment, a plurality of sinking aid components 5 may be connected in series through the same steel rod 53 during prefabrication to increase the weight of the connected sinking aid components 5 and to stably arrange the anode cable 4 within a certain length range.

[0051] In an optional embodiment, the rope 6 can be a Kraft rope, and multiple sinking aid components 5 connected in series through the anode cable 4 are connected in sequence outside the sinking aid component 5, and tied and fixed to the rods on the sinking aid component 5 with a cable tie to ensure that during the lowering process of the sacrificial anode block group 3, the rope 6 can bear the load of all sinking aid components 5 on the anode cable 4, avoid the anode cable 4 from being disconnected from the sacrificial anode block group 3 after being pulled, and ensure the effectiveness of the cathodic protection system after installation.

[0052] In one or more embodiments, Figure 5 As shown, in step 2, a buffer ring 31 is provided on the sacrificial anode block group 3, and the anode cable 4 is wound around the buffer ring 31 for several turns and fixed in position. The length of the anode cable 4 is redundantly reserved on the sacrificial anode block group 3 to prevent shear wear at the contact position between the anode cable 4 and the sacrificial anode block group 3 during and after the sacrificial anode block group 3 is lowered, thereby reducing the life of the anode cable 4 or even directly damaging the anode cable 4.

[0053] In an optional embodiment, the buffer ring 31 may be an annular structure welded to the sacrificial anode block group 3, and the anode cable 4 may be wrapped around the buffer ring 31 for several turns along its circumference and then fixed by tying with a cable tie.

[0054] In one or more embodiments, Figure 8 As shown, in step 5, the first hook 81 of the crane 8 is connected to the sacrificial anode block group 3 through the wire rope 82 and the automatic unhooking shackle 83, and the second hook 84 of the crane 8 is hooked to the rope 6 and the above-water installation end of the anode cable 4, as shown in FIG. Fig. 9 As shown, the sacrificial anode block group 3 is sunk to the bottom of the water, and the automatic unhooking shackle 83 is released. Fig.10 As shown, the second hook 84 guides the sinking aid components 5 to sink into place one by one and pulls the anode cable 4 above the water surface. The two hooks of the crane 8 cooperate to complete the sinking installation process of the sacrificial anode block group 3.

[0055] In an optional implementation, the first hook 81 may be a large hook of a crane 8, the second hook 84 may be a small hook of a crane 8, and the crane 8 may be a crawler crane 8 or a crane barge.

[0056] In one or more embodiments, Figure 8 As shown, during the sinking process of the sacrificial anode block group 3, the relative position of the sacrificial anode block group 3 and the steel pipe pile 10 is adjusted by the traction rope 85, so as to achieve accurate determination of the installation position of the sacrificial anode block group 3.

[0057] In an optional embodiment, the hooking position of the traction rope 85 and the wire rope 82 of the crane 8 can be consistent, and the relative position of the sacrificial anode block group 3 and the steel pipe pile 10 can be adjusted by pulling the traction rope 85 and the traction direction. The sacrificial anode block group 3 can be installed under the steel pipe pile 10 with a platform structure by traction of the traction rope 85.

[0058] In one or more embodiments, Fig.11 As shown, in step 5, the crane 8 is continued to be used as a hanging basket, and the staff in the hanging basket limits the part of the anode cable 4 located above the water surface on the steel pipe pile 10 through a plurality of pipe clamps 9 to prevent the anode cable 4 from being damaged by the swaying of water flow and wind.

[0059] In an optional embodiment, the pipe clamp 9 can be selectively set on a steel pipe pile 10 closest to the junction box 2 during the process of the anode cable 4 being pulled from the sacrificial anode block group 3 to the junction box 2. The installation time of the pipe clamp 9 is not affected by the lowering of the sacrificial anode block group 3 and can be installed before or after it. It can be manually installed and fixed using a crane 8, a hanging basket or a boat based on comprehensive considerations of factors such as water level and working surface.

[0060] In an optional embodiment, the pipe clamp 9 may be a stainless steel pipe clamp 9 , which is bolted to the steel pipe pile 10 after clamping it, and a wire clamp for clamping the anode cable 4 is provided on the pipe clamp 9 .

[0061] In an optional embodiment, the portion of the anode cable 4 located above the water surface is fixed by three pipe clamps 9 arranged at equal intervals.

[0062] Example 2 like Fig.12 As shown, a steel pipe pile structure adopts a steel pipe pile remote cathodic protection system construction method described in the embodiment, and includes a steel pipe pile 10, a sacrificial anode block group 3, a junction box 2, an anode cable 4, a cathode cable 1 and a plurality of sinking aid components 5; A plurality of steel pipe piles 10 are welded and connected by connecting steel bars 7 to form a cathode steel pipe pile group 10; The sacrificial anode block group 3 sinks to the bottom of the water and is spaced apart from the steel pipe pile 10; The junction box 2 is arranged on the upper structure of the steel pipe pile 10; One end of the cathode cable 1 is welded to the steel pipe pile 10, and the other end is connected to the junction box 2; One end of the anode cable 4 is welded to the sacrificial anode block group 3 and the other end is connected to the junction box 2. The underwater part of the anode cable 4 is limited and laid on the bottom of the water by a number of sinking aid components 5, and the above-water part of the anode cable 4 is limited to the outer wall of the steel pipe pile 10 by a number of pipe clamps 9.

[0063] A steel pipe pile structure of this embodiment can be a water-based building structure with steel pipe piles 10, such as a high-pile dock, an offshore platform, etc., which adopts the construction method of embodiment 1. Fig.12 As shown, a certain high-pile wharf structure has steel pipe piles 10 and is provided with a remote cathodic protection system. A construction method of a remote cathodic protection system for steel pipe piles in Example 1 is adopted. The sacrificial anode block group 3 is prefabricated in advance and the construction of the remote cathodic protection system is completed by a crane 8. Cathodic protection is performed on each steel pipe pile 10. The installation and construction of the cathodic protection system can be achieved without diving operations. The construction risk is small, the efficiency is high and the cost is low. The use effect of the cathodic protection system can be ensured, and effective anti-corrosion protection of the steel pipe piles 10 can be achieved. At the same time, the cathode cable 1 of the cathodic protection system is stably fixed in the steel pipe pile 10, and the anode cable 4 is laid and fixed underwater with the assistance of a sinking aid component 5 at the bottom of the water. The above-water part is relatively fixed to the steel pipe pile 10 through a pipe clamp 9, so that the structure of the cathodic protection system is stable and the use effect can be ensured.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A construction method for a steel pipe pile remote cathodic protection system, characterized in that: include: Step 1, welding a cathode cable (1) on a steel pipe pile (10), and connecting the cathode cable (1) to a junction box (2); Step 2, prefabricating and assembling a sacrificial anode block group (3), wherein an anode cable (4) and a plurality of anode blocks (35) are welded to the sacrificial anode block group (3), and a plurality of sinking aid components (5) are tied to the anode cable (4) at intervals; Step 3, connecting all sinking aid components (5) on the anode cable (4) via ropes (6), and keeping the anode cable (4) looser than the ropes (6); Step 4, determining the underwater installation position of the sacrificial anode block group (3) by GPS; Step 5: hoist the sacrificial anode block group (3) by means of a crane (8), lower it to the installation position, and synchronously pull the sinking aid component (5) down for installation by means of the rope (6), then pull the anode cable (4) above the water surface and connect it to the junction box (2).

2. A method for constructing a remote cathodic protection system for steel pipe piles according to claim 1, characterized in that: The method further comprises the step of welding at least two steel pipe piles (10) together through connecting steel bars (7) to form a cathode steel pipe pile (10) group, wherein the connecting steel bars (7) are provided with a protective layer.

3. The construction method of a steel pipe pile remote cathodic protection system according to claim 1, characterized in that: In step 1, the cathode cable (1) is welded to the inner wall of the steel pipe pile (10) before the pile core concrete is poured, and is isolated from the pile core steel cage by an insulating support pad (11), or the cathode cable (1) is welded to the outer wall of the steel pipe pile (10) and is sealed by a joint protection box (12).

4. A method for constructing a remote cathodic protection system for steel pipe piles according to claim 3, characterized in that: Two cathode cables (1) are arranged side by side, and the two cathode cables (1) are respectively connected to the steel pipe piles (10) by needle brazing; In step 2, at least one anode cable (4) is welded onto the sacrificial anode block group (3).

5. The construction method of a steel pipe pile remote cathodic protection system according to claim 3, characterized in that: The sinking aid component (5) comprises a concrete block (51), wherein at least one pipe member (52) and at least one steel rod member (53) are embedded in the concrete block (51), and the steel rod member (53) extends from both sides of the concrete block (51); In step 2, the anode cable (4) passes through the pipe (52) and is tied to the steel rod (53); In step 3, the rope (6) is tied to the steel rod (53).

6. A steel pipe pile remote cathodic protection system construction method according to claim 5, characterized in that: In step 2, a buffer ring (31) is provided on the sacrificial anode block group (3), and the anode cable (4) is wound around the buffer ring (31) for several turns and fixed in position.

7. A method for constructing a remote cathodic protection system for steel pipe piles according to any one of claims 1 to 6, characterized in that: In step 5, the first hook (81) of the crane (8) is connected to the sacrificial anode block group (3) through a steel wire rope (82) and an automatic unhooking shackle (83), and the second hook (84) of the crane (8) is hooked to the rope (6) and the above-water installation end of the anode cable (4). After the sacrificial anode block group (3) is sunk to the bottom of the water, the automatic unhooking shackle (83) is released, and the second hook (84) guides the sinking aid components (5) to sink one by one to the position and pulls the anode cable (4) above the water surface.

8. A method for constructing a remote cathodic protection system for steel pipe piles according to claim 7, characterized in that: During the sinking process of the sacrificial anode block group (3), the relative position of the sacrificial anode block group (3) and the steel pipe pile (10) is adjusted by means of a traction rope (85).

9. A method for constructing a remote cathodic protection system for steel pipe piles according to claim 8, characterized in that: In step 5, the anode cable (4) located above the water surface is restrained on the steel pipe pile (10) by a plurality of pipe clamps (9).

10. A steel pipe pile structure, characterized in that: A method for constructing a remote cathodic protection system for steel pipe piles according to any one of claims 1 to 9 is adopted, and comprises a plurality of steel pipe piles (10), a sacrificial anode block group (3), a junction box (2), an anode cable (4), a cathode cable (1) and a plurality of sinking aid components (5); A plurality of the steel pipe piles (10) are welded and connected by connecting steel bars (7) to form a cathode steel pipe pile (10) group; The sacrificial anode block group (3) is sunk to the bottom of the water and is spaced apart from the steel pipe pile (10); The junction box (2) is arranged on the upper structure of the steel pipe pile (10); One end of the cathode cable (1) is welded to the steel pipe pile (10), and the other end is connected to the junction box (2); One end of the anode cable (4) is welded to the sacrificial anode block group (3), and the other end is connected to the junction box (2); the underwater part of the anode cable (4) is limited and laid on the bottom of the water by a plurality of sinking aid components (5); and the above-water part of the anode cable (4) is limited to the outer wall of the steel pipe pile (10) by a plurality of pipe clamps (9).

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