Sacrificial anode anti-corrosion device for cross-sea bridge steel pipe pile

Abstract

The utility model discloses a sacrificial anode anti-corrosion device for a cross-sea bridge steel pipe pile, which is mounted on a bearing platform electrically connected with the steel pipe pile and comprises an embedded conductor, an external conductor and a sacrificial anode piece, the pre-embedded conductor is partially embedded in the bearing platform and is connected with the reinforcing steel bars in the bearing platform; the sacrificial anode piece is embedded in a seabed covering layer on the side part of the bearing platform; the external conductor adopts a rigid structure; one end of the external conductor is connected with the part of the embedded conductor exposed out of the bearing platform, and the other end is connected with the sacrificial anode piece. The device can be synchronously constructed and mounted along with the bearing platform main body structure, so that the complex procedure of secondary diving operation in the traditional process is avoided, the construction efficiency is greatly improved, and the underwater operation risk is reduced. Meanwhile, according to the device, the protection period is prolonged through a replaceable connecting structure, the anti-scouring performance is improved through a rigid external conductor attached to the surface of the bearing platform, and the protection state of the steel pipe pile is intelligently monitored in real time through a cathode monitoring system.

Description

Technical Field

[0001] This utility model relates to the field of marine engineering corrosion protection technology, and in particular to a sacrificial anode corrosion protection device for steel pipe piles of cross-sea bridges. Background Technology

[0002] Steel structures widely used in marine engineering are constantly threatened by seawater corrosion, with an average annual corrosion rate of 0.3-0.4 mm, and localized corrosion exceeding 1.0 mm / year, directly affecting structural safety and service life. For steel pipe piles with a design life of 35 years, sacrificial anode protection systems are currently widely used as an anti-corrosion measure. However, existing installation methods require directly welding the anodes onto the steel pipe piles. When the mud level in the construction area is too shallow, the anodes cannot be directly installed after pile driving, necessitating underwater welding operations by divers. This not only prolongs the construction period but also poses serious safety hazards.

[0003] Traditional corrosion protection technologies have significant limitations: sacrificial anodes are consumed rapidly, have short lifespans, and are costly to replace; organic coatings are prone to aging and peeling, requiring frequent maintenance; impressed current cathodic protection relies on continuous power supply, posing complex maintenance and the risk of overprotection. To meet the requirement of a 100-year service life, current solutions employ a combination of coatings and sacrificial anodes: initially using high-performance coatings as the primary method and sacrificial anodes as a secondary method, later transitioning to a system primarily using sacrificial anodes with redundant steel thickness, supplemented by coatings. However, in practical applications, this solution suffers from the drawback of an unreplaceable anode system; even after the anodes are depleted, steel components will still experience corrosion and thinning. These unresolved technical challenges constrain the durability of ultra-long-life marine engineering structures. Utility Model Content

[0004] The main technical problem to be solved by this utility model is to provide a sacrificial anode anti-corrosion device for steel pipe piles of cross-sea bridges, which has a simple connection structure and installation method to improve construction efficiency and construction safety.

[0005] To address the aforementioned technical problems, this utility model provides a sacrificial anode anti-corrosion device for steel pipe piles of cross-sea bridges, which is installed on a bearing platform electrically connected to the steel pipe piles. The device includes a pre-embedded conductor, an external conductor, and a sacrificial anode component.

[0006] The pre-embedded conductor is embedded in the foundation and connected to the internal steel reinforcement of the foundation; the sacrificial anode is embedded in the seabed cover layer on the side of the foundation; the external conductor adopts a rigid structure that is partially attached to the surface of the foundation; one end of the external conductor is connected to the part of the pre-embedded conductor exposed in the foundation, and the other end is connected to the sacrificial anode.

[0007] In a preferred embodiment, the external conductor is configured as a spatial structure with multiple bends.

[0008] In a preferred embodiment, the bottom of the external conductor is configured in an L-shape in the horizontal direction to connect with the sacrificial anode in a direction parallel to the surface of the substrate.

[0009] In a preferred embodiment, the end of the external conductor is welded or bolted to the sacrificial anode and the embedded conductor.

[0010] In a preferred embodiment, the system further includes a cathode monitoring system; the cathode monitoring system includes a control box, a monitoring cable, and a protection potential probe; the control box is installed above the design high water level of the pier body; the protection potential probe is installed below the bottom sealing concrete of the pier cap; and the monitoring cable is tied to the reinforcement cage of the pier body.

[0011] In a preferred embodiment, the embedded conductor is disposed on the top of the foundation.

[0012] In a preferred embodiment, the embedded conductor is an electrically connected flat steel.

[0013] In a preferred embodiment, the sacrificial anode is a Zn-Al-Cd type zinc alloy sacrificial anode block.

[0014] In a preferred embodiment, the sacrificial anode is surrounded by an anode packing bag.

[0015] In a preferred embodiment, the device is set in two sets at the position corresponding to each steel pipe pile.

[0016] Compared with existing technologies, this practical technical solution has the following beneficial effects:

[0017] The device provided by this utility model can be installed simultaneously with the main structure of the pile cap, avoiding the complex procedures requiring secondary diving operations in traditional processes, significantly improving construction efficiency and reducing underwater operation risks. Secondly, the device adopts a modular structure design, which is simple in structure, convenient to install, and facilitates subsequent segmented maintenance and replacement. Thanks to this, the sacrificial anode block can be replaced multiple times, greatly extending the protection cycle and significantly prolonging the service life of the steel pipe pile. The external conductor, serving as the connecting frame, adopts a rigid structure, with its two ends welded to adjacent components and fitted to the surface of the pile cap. These designs improve the device's erosion resistance and operational stability in complex marine environments. Furthermore, the configured monitoring system enables real-time, intelligent monitoring of the steel pipe pile's protection status, providing a reliable basis for maintenance decisions regarding the sacrificial anode components. Attached Figure Description

[0018] Figure 1 This is a perspective view of the device described in the embodiments of this utility model;

[0019] Figure 2This is a top view of the device described in an embodiment of the present utility model;

[0020] Figure 3 This is a cross-sectional schematic diagram of the device described in the embodiment of this utility model;

[0021] Figure 4 This is a schematic diagram showing the connection between the device described in this embodiment and the internal reinforcing steel bars of the foundation.

[0022] Figure 5 This is a schematic diagram showing the connection between the conductive claw and the sacrificial anode in an embodiment of this utility model;

[0023] Figure 6 This is a three-dimensional schematic diagram of the conductive claw and sacrificial anode component described in the embodiments of this utility model.

[0024] The markings in the diagram are as follows: 1-Sacrificial anode, 2-Conductive claw, 3-Electrically connected flat steel, 4-Anode filler bag, 5-Pile cap, 51-Pile cap internal reinforcement, 6-Steel pipe pile, 7-Cathode monitoring system, 71-Control box, 72-Monitoring cable, 73-Protective potential probe, 8-Pier body. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0026] In this description, it should be noted that the terms "upper," "lower," "inner," "outer," and "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In this utility model description, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed", "equipped", "set up / connected", "connected", etc., should be interpreted broadly. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0028] like Figures 1-6 As shown in the figure, this utility model embodiment provides a sacrificial anode anti-corrosion device for steel pipe piles of cross-sea bridges, including a pre-embedded conductor, an external conductor, and a sacrificial anode component 1.

[0029] like Figure 2 As shown, the bottom of the foundation 5 is provided with a plurality of steel pipe piles 6, and at least one set of sacrificial anode elements 1 is provided at each steel pipe pile 6. In this embodiment, the bottom of the foundation 5 is provided with four steel pipe piles 6, and each steel pipe pile 6 is provided with two sets of sacrificial anode elements 1. The sacrificial anode elements 1 are Zn-Al-Cd type zinc alloy sacrificial anode blocks, which have the characteristics of high activity and long service life. Preferably, as Figure 5 As shown, the sacrificial anode 1 is surrounded by several anode packing bags 4 to reduce grounding resistance. The backfill equivalent diameter of the anode packing bags 4 is not less than 0.3m. The external conductor is a conductive claw 2. Figure 1 , Figure 6 As shown, the conductive claw 2 is constructed as a rigid spatial structure with multiple bent segments. In the vertical direction, the conductive claw 2 bends into a "Z" shape along the outer contour of the support 5 to adhere to the top and side surfaces of the support 5; in the horizontal direction, the bottom of the conductive claw 2 bends into an "L" shape to connect with the sacrificial anode 1 in a direction parallel to the surface of the support 5. Figure 4 As shown, the embedded conductor is an electrically connected flat steel bar 3. The electrically connected flat steel bar 3 is partially embedded in the foundation 5, and by constructing a "Z"-shaped structure, one end is connected to the internal steel bar 51 of the foundation, and the other end is connected to the conductive claw 2.

[0030] like Figure 3 As shown, the sacrificial anode 1 is embedded in the seabed cover layer on the side of the bearing platform 5, at a height of 2.20m from the top of the bearing platform 5. The sacrificial anode 1 extends a welding tongue, which is welded to the "L"-shaped horizontal section at the bottom of the conductive claw 2. The welding structure is as follows. Figure 6As shown. The conductive claw 2 is attached to the side and top of the foundation 5, and is welded to the exposed portion of the foundation 5 of the electrical connection flat steel 3 at the top. The weld length is not less than 20cm, and the weld must be full and continuous. It should be understood that the protected object of the device is the steel pipe pile 6 at the bottom of the foundation 5. Therefore, in order to realize the electrical connection between the sacrificial anode 1 and the steel pipe pile 6, after the foundation pit of the foundation 5 is excavated, several connecting steel bars are symmetrically welded to the top of the steel pipe pile 6. The connecting steel bars are welded to the internal steel bars 51 of the foundation, thereby realizing a complete conductive path of steel pipe pile 6 - internal steel bars 51 of the foundation - electrical connection flat steel 3 - conductive claw 2 - sacrificial anode 1.

[0031] In this embodiment, the device includes a cathode monitoring system 7 for monitoring the protective potential of the steel pipe pile 6. Figure 3 As shown, the cathode monitoring system 7 includes a control box 71, a monitoring cable 72, and a protection potential probe 73. The control box 71 is installed at a position 1m above the designed high water level of the pier body 8, with an IP67 protection rating. The control box 71 is equipped with a solar panel to provide stable power supply and a transmitting antenna for remote communication. The protection potential probe 73 is installed 0.5m below the bottom sealing concrete of the pier cap 5 and must be installed before the bottom sealing concrete is poured. The monitoring cable 72 is tied to the reinforcing cage of the pier body 8 with cable ties. The cathode monitoring system 7 is configured to monitor once a day, and the monitoring data can be collected remotely or on-site.

[0032] In summary, the device provided in this embodiment is directly installed on the side of the foundation 5, and connects to the internal reinforcing steel 51 of the foundation through a pre-embedded conductor, thus achieving electrical connection with the steel pipe pile 6. This design allows the device to be installed synchronously with the main structure of the foundation, avoiding the complex process of secondary diving operations required in traditional processes, significantly improving construction efficiency and reducing underwater operation risks. Secondly, the device adopts a modular structure design, which is simple in structure, convenient to install, and easy to maintain and replace in sections later. Thanks to this, the protection cycle of the sacrificial anode 1 can be extended to 100 years through multiple replacements, significantly extending the service life of the steel pipe pile 6. The conductive claw 2, which serves as the connecting skeleton, adopts a rigid structure, with its two ends welded to adjacent components and fitted to the surface of the foundation 5. These designs improve the device's erosion resistance and operational stability in complex marine environments. The cathode monitoring system 7 configured in the device enables real-time and intelligent monitoring of the protection status of the steel pipe pile 6, providing a reliable basis for maintenance decisions of the sacrificial anode 1.

[0033] The above description is merely a preferred embodiment of the present invention and is not intended to limit the patent scope of the present invention. Any technically equivalent modifications made based on the content of this specification shall fall within the protection scope of the present invention.

Claims

1. A sacrificial anode corrosion protection device for steel pipe piles of a cross-sea bridge, installed on a bearing platform electrically connected to the steel pipe pile, characterized in that: This includes embedded conductors, external conductors, and sacrificial anode components; The pre-embedded conductor portion is embedded in the bearing platform and connected to the internal steel reinforcement of the bearing platform; The sacrificial anode is embedded in the seabed cover layer on the side of the foundation. The external conductor adopts a rigid structure that is partially attached to the surface of the foundation; one end of the external conductor is connected to the portion of the pre-embedded conductor exposed on the foundation, and the other end is connected to the sacrificial anode.

2. The sacrificial anode anti-corrosion device for steel pipe piles of a cross-sea bridge according to claim 1, characterized in that: The external conductor is constructed as a spatial structure with multiple bends.

3. The sacrificial anode corrosion protection device for steel pipe piles of a cross-sea bridge according to claim 2, characterized in that: The bottom of the external conductor is L-shaped in the horizontal direction to connect with the sacrificial anode in a direction parallel to the surface of the foundation.

4. The sacrificial anode anti-corrosion device for steel pipe piles of a cross-sea bridge according to claim 1, characterized in that: The end of the external conductor is welded or bolted to the sacrificial anode and the embedded conductor.

5. The sacrificial anode anti-corrosion device for steel pipe piles of a cross-sea bridge according to claim 1, characterized in that: It also includes a cathode monitoring system; the cathode monitoring system includes a control box, a monitoring cable and a protection potential probe; the control box is installed above the design high water level of the pier body; the protection potential probe is installed below the bottom sealing concrete of the pier cap; the monitoring cable is tied to the steel reinforcement cage of the pier body.

6. The sacrificial anode anti-corrosion device for steel pipe piles of a cross-sea bridge according to claim 1, characterized in that: The embedded conductor is located on the top of the foundation.

7. The sacrificial anode anti-corrosion device for steel pipe piles of a cross-sea bridge according to claim 1, characterized in that: The embedded conductor is made of electrically conductive flat steel.

8. The sacrificial anode anti-corrosion device for steel pipe piles of a cross-sea bridge according to claim 1, characterized in that: The sacrificial anode is a Zn-Al-Cd type zinc alloy sacrificial anode block.

9. The sacrificial anode anti-corrosion device for steel pipe piles of a cross-sea bridge according to claim 1, characterized in that: The sacrificial anode is surrounded by an anode packing.

10. The sacrificial anode anti-corrosion device for steel pipe piles of a cross-sea bridge according to claim 1, characterized in that: The device is installed in two sets at the location corresponding to each steel pipe pile.

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