Super-long pile foundation anti-corrosion structure

Abstract

The utility model discloses a super-long pile foundation anti-corrosion structure, which relates to the technical field of super-long pile anti-corrosion construction, and adopts the technical scheme that the super-long pile foundation anti-corrosion structure comprises a sacrificial anode device arranged on a pile foundation permanent steel casing, and the top of the pile foundation permanent steel casing is a bearing platform or a straining beam bottom; the sacrificial anode device is in a circular shape and comprises four anode bodies assembled into a circular shape and an anode core penetrating through each anode body. The anti-corrosion structure of the super-long pile foundation has the advantages that the anti-corrosion work of the underwater super-long pile foundation is carried out by adopting a cathode protection method of a sacrificial anode, and the sacrificial anode device is arranged on the outer side of the permanent steel casing. The method has the advantages of good anti-corrosion effect, simplicity in maintenance, no environmental influence, simple construction process and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of super-long pile anti-corrosion construction, in particular to a super-long pile foundation anti-corrosion structure. Background Art

[0002] The marine environment is a place where multiple complex factors such as salinity, climate, and biology overlap, making it recognized as the harshest service environment for materials. This is especially true for cement concrete, the main material used to build coastal infrastructure.

[0003] Because the coastal environment contains a large amount of corrosive ions, mainly chloride ions, sulfate ions, etc., these corrosive ions migrate into the concrete through the internal voids and microcracks of the concrete by means of infiltration, capillary action, diffusion, electrochemical migration, etc., destroying the passivation film on the surface of the steel bars in the concrete, reacting with iron to form electrochemical corrosion, causing steel corrosion. The chemical substances produced by the corrosion of steel bars produce large expansion stress inside the concrete due to the increase in volume, causing the concrete protective layer to peel off or crack along the bars, resulting in volume expansion, causing the concrete to crack, peel off and disintegrate, and then leading to loss of strength and bonding properties.

[0004] The existing anti-corrosion technologies for underwater ultra-long pile foundations are mainly the following:

[0005] Coating anti-corrosion: A layer of anti-corrosion coating is applied on the surface of the pile foundation to prevent the contact between seawater and the pile foundation. Commonly used coating materials include epoxy resin coating, asphalt coating, polyethylene coating, etc.

[0006] Chemical additives: Add chemical additives to concrete to improve its corrosion resistance. Commonly used chemical additives include sodium nitrite, phosphates, borates, etc.

[0007] However, these technologies all have certain limitations:

[0008] Coating anti-corrosion: The coating is easy to be damaged, and once damaged, it will lose its anti-corrosion effect. In addition, the coating construction process is complicated and the cost is high.

[0009] Chemical additives: Chemical additives will affect the performance of concrete and the dosage needs to be strictly controlled.

[0010] Therefore, how to provide an anti-corrosion structure that can improve the corrosion resistance of super-long piles, increase the service life of the structure and cause less environmental pollution is the research focus of this program. Utility Model Content

[0011] In order to achieve the above-mentioned purpose of the utility model and to address the above-mentioned technical problems, the utility model provides an ultra-long pile foundation anti-corrosion structure.

[0012] The technical solution is as follows: it comprises a sacrificial anode device arranged on a permanent steel casing of a pile foundation, the top of which is a cap or a tie beam bottom;

[0013] The sacrificial anode device is circular in shape, and comprises four anode bodies assembled into a circular shape and an anode core penetrating each of the anode bodies, with both ends of the anode core passing through the anode body;

[0014] The two ends of the anode body are symmetrically provided with connecting ear plates, and the connecting ear plates of two adjacent anode bodies are abutted against each other and fixedly connected by nuts.

[0015] This structure has the following advantages:

[0016] Increased surface area: The four anode bodies are assembled into a circle, which can increase the surface area of ​​the sacrificial anode and thus improve the anti-corrosion effect.

[0017] Easy installation: The anode body and anode core adopt modular design, which is convenient for on-site assembly and installation, reducing construction costs.

[0018] Improved corrosion protection: Larger surface area provides greater current flow, thus more effectively protecting the permanent steel casing of the pile foundation from corrosion.

[0019] Each piece of the anode body is adapted to the outer wall of the permanent steel casing of the pile foundation, which means that the shape and size of the anode body should match the shape of the permanent steel casing of the pile foundation to ensure close contact and good conductivity.

[0020] Close contact can reduce the gap between the anode body and the permanent steel casing of the pile foundation, prevent seawater from infiltrating, and thus improve the anti-corrosion effect.

[0021] Good conductivity can ensure that the current is evenly distributed on the surface of the permanent steel casing of the pile foundation, thus providing more effective protection.

[0022] Each anode body is configured to be 1 / 4 circular, so that materials can be effectively utilized and it is convenient to assemble into a circular structure.

[0023] The 1 / 4 round shape can maximize the use of materials and reduce material waste. It can be easily assembled into a circular structure, simplifying the manufacturing process.

[0024] The sacrificial anode device adopts an aluminum alloy bracelet-type sacrificial anode. Aluminum alloy has good electrical conductivity and corrosion resistance, and can be used as an effective sacrificial anode material to extend the service life of the sacrificial anode. The bracelet-type structure can increase the surface area of ​​the anode and improve the anti-corrosion effect. The bracelet-type anode and the permanent steel casing of the pile foundation form a primary battery in a humid environment. The aluminum alloy is consumed by oxidation reaction as the negative electrode, and the steel casing can avoid corrosion as the positive electrode.

[0025] The sacrificial anode device is arranged on the part of the permanent steel casing of the pile foundation above the water surface. The sacrificial anode device is arranged on the part above the water surface, which can more effectively protect the permanent steel casing of the pile foundation from corrosion and prolong its service life.

[0026] Each permanent steel casing of the pile foundation is provided with a set of sacrificial anode devices to ensure that each permanent steel casing of the pile foundation is effectively cathodically protected.

[0027] Each permanent steel casing of the pile foundation is equipped with a sacrificial anode device to ensure that each permanent steel casing of the pile foundation is evenly cathodically protected to avoid local corrosion.

[0028] A feeder tube is provided in each anode body, and four feeder tubes are provided in each set of sacrificial anode devices;

[0029] The feeder pipe is firmly welded with the permanent steel casing of the pile foundation and the anode core to increase conductivity. The feeder pipe can transmit current from the anode core to the permanent steel casing of the pile foundation, thereby realizing cathodic protection. Good conductivity can improve the effect of cathodic protection and extend the service life of the permanent steel casing of the pile foundation.

[0030] The sacrificial anode device is assembled in groups of 4 pieces. Each anode body is 1 / 4 circle. Each anode body is penetrated by the anode core. The 4 anode bodies are assembled into a whole circle and installed on the permanent steel casing of the pile foundation. The inner diameter of the sacrificial anode device is divided into four types: 1928mm, 2128mm, 2328mm, and 2528mm according to the outer diameter of the permanent steel casing of the pile foundation. They are respectively suitable for steel casings of pile foundations with different pile diameters, and the height is 306mm.

[0031] The technical solution provided by the embodiment of the utility model has the following beneficial effects: the solution proposes an anti-corrosion structure for super-long pile foundations, adopts the cathodic protection method of sacrificial anodes to carry out the anti-corrosion work of underwater super-long pile foundations, and sets a sacrificial anode device on the outside of the permanent steel casing. It has the advantages of good anti-corrosion effect, simple maintenance, no environmental influence, simple construction process, etc., which are specifically reflected in the following aspects:

[0032] Good anti-corrosion effect: It can solve the problem that pile foundations are easily corroded in high-salt areas such as salt ponds, effectively improve the corrosion resistance of super-long piles, effectively protect pile foundations from corrosion, increase the service life of structures, and do not require external current, with little pollution to the environment;

[0033] Simple maintenance: The sacrificial anode device is installed on the part of the steel casing above the water surface. The installation and maintenance are simple and flexible, easy to operate, low cost and cost saving;

[0034] Not affected by the environment: Not affected by seawater environment, and the anti-corrosion effect is stable;

[0035] Widely used: It can prevent the protected metal from dissolving into electrolytes, including seawater and other media. It can be widely used in sea mud medium environments, gas pipelines, oil pipelines and other pipeline projects, and water conservancy projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model.

[0037] Figure 2 It is a schematic diagram of the structure of a single-piece anode body according to an embodiment of the utility model.

[0038] Figure 3 It is a schematic structural diagram of the anode body of the fourth embodiment of the utility model.

[0039] Figure 4 It is a schematic diagram of the structure of the feeding tube according to an embodiment of the utility model.

[0040] The reference numerals are: 1. permanent steel casing of pile foundation; 2. water surface; 3. sacrificial anode device; 4. cap or tie beam bottom; 5. feeder tube;

[0041] 301, anode body; 302, anode core; 303, connecting ear plate. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. Of course, the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0043] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0044] In the description of the invention of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention of the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention of the utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention of the present utility model, unless otherwise specified, "multiple" means two or more.

[0045] In the description of the invention of the utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention of the utility model can be understood according to specific circumstances.

[0046] Example 1

[0047] See also Figures 1 to 4 The utility model provides an ultra-long pile foundation anti-corrosion structure, comprising a sacrificial anode device 3 arranged on a permanent steel casing 1 of the pile foundation, the top of the permanent steel casing 1 of the pile foundation is a cap or a tie beam bottom 4;

[0048] The sacrificial anode device 3 is circular in shape, and comprises four anode bodies 301 assembled into a circular shape and an anode core 302 penetrating each anode body 301 , with both ends of the anode core 302 passing through the anode body 301 ;

[0049] Connecting ear plates 303 are symmetrically arranged at both ends of the anode body 301 , and the connecting ear plates 303 of two adjacent anode bodies 301 abut against each other and are fixedly connected by nuts.

[0050] Each anode body 301 is adapted to the outer wall of the permanent steel casing 1 of the pile foundation.

[0051] Each anode body 301 is configured to be 1 / 4 circular.

[0052] The sacrificial anode device 3 uses an aluminum alloy bracelet-type sacrificial anode. The bracelet-type anode and the permanent steel casing of the pile foundation form a primary battery in a humid environment. The aluminum alloy as the negative electrode undergoes oxidation reaction and is consumed, and the steel casing as the positive electrode can avoid corrosion.

[0053] The sacrificial anode device 3 is arranged on the part of the permanent steel casing 1 of the pile foundation which is above the water surface 2 .

[0054] Each permanent steel casing 1 of the pile foundation is provided with a set of sacrificial anode device 3.

[0055] A feed tube 5 is provided in each anode body 301, and four feed tubes 5 are provided in each sacrificial anode device 3;

[0056] The feeder tube 5 is firmly welded to the permanent steel casing 1 of the pile foundation and the anode core 302 to increase conductivity.

[0057] The sacrificial anode device 3 is assembled in groups of 4 pieces, each anode body 301 is 1 / 4 circle, each anode body 301 is penetrated by the anode core 302, and the 4 anode bodies 301 are assembled into a whole circle shape and installed on the permanent steel casing 1 of the pile foundation. The inner diameter of the sacrificial anode device 3 is divided into four types: 1928mm, 2128mm, 2328mm, and 2528mm according to the different outer diameters of the permanent steel casing 1 of the pile foundation, which are respectively suitable for steel casings of pile foundations with different pile diameters, and the height is 306mm.

[0058] When in use, the sacrificial anode device 3 is installed on the permanent steel casing 1 of the pile foundation by a crane, and its position is adjusted according to the mark. After checking and confirming that it is correct, the nut is tightened to complete the installation. Each anode body 301 is connected with M30 bolts and fixed with double nuts.

[0059] A feed tube 5 is provided in each anode body 301, and four feed tubes 5 are provided in each sacrificial anode device 3;

[0060] The feeder tube 5 is firmly welded to the permanent steel casing 1 of the pile foundation and the anode core 302 to increase conductivity. The weld surface is required to be well formed without defects such as cracks, undercuts, slag inclusions, and incomplete fusion.

[0061] After the sacrificial anode device of a single pedestal or ground tie beam is fully installed, each permanent steel casing 1 of the pile foundation is electrically connected, and a single steel bar with a diameter of 16 mm is used to weld the permanent steel casing 1 of the pile foundation of a single pedestal or ground tie beam in series to firmly connect them into a whole. The connection resistance value should not be less than 0.01Ω to ensure that the points of each steel pipe pile are uniform during the cathodic protection period. The surface of the steel bar is coated with SEBF coating for anti-corrosion protection, and the coating thickness is ≥800μm.

[0062] Example 2

[0063] On the basis of Example 1, the material of the sacrificial anode can be appropriately adjusted under the conditions described in this application, and different materials can be selected according to different geological conditions of the construction.

[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, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An ultra-long pile foundation anti-corrosion structure, characterized in that: It comprises a sacrificial anode device (3) arranged on a permanent steel casing (1) of a pile foundation, the top of which is a cap or a tie beam bottom (4); The sacrificial anode device (3) is circular in shape, comprising four anode bodies (301) assembled into a circular shape and an anode core (302) penetrating each of the anode bodies (301), with both ends of the anode core (302) passing through the anode body (301); Connecting ear plates (303) are symmetrically arranged at both ends of the anode body (301), and the connecting ear plates (303) of two adjacent anode bodies (301) abut against each other and are fixedly connected by nuts.

2. The super-long pile foundation anti-corrosion structure according to claim 1, characterized in that: Each anode body (301) is adapted to the outer wall of the permanent steel casing (1) of the pile foundation.

3. The super-long pile foundation anti-corrosion structure according to claim 1, characterized in that: Each anode body (301) is configured to be 1 / 4 circular.

4. The super-long pile foundation anti-corrosion structure according to claim 1, characterized in that: The sacrificial anode device (3) adopts an aluminum alloy bracelet-type sacrificial anode.

5. The super-long pile foundation anti-corrosion structure according to claim 1, characterized in that: The sacrificial anode device (3) is arranged on the part of the permanent steel casing (1) of the pile foundation above the water surface (2).

6. The super-long pile foundation anti-corrosion structure according to claim 1, characterized in that: Each of the pile foundation permanent steel casings (1) is provided with a set of sacrificial anode devices (3).

7. The super-long pile foundation anti-corrosion structure according to claim 1, characterized in that: A feeder tube (5) is arranged in each anode body (301), and four feeder tubes (5) are arranged in each set of the sacrificial anode device (3); The feeder tube (5) is firmly welded to the permanent steel casing (1) of the pile foundation and the anode core (302) to increase conductivity.

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