Carbon fiber spiral hoop as a self-powered cathodic protection pile structure

Abstract

The application provides a pile structure adopting carbon fiber spiral hoop as self-powered cathodic protection, which comprises carbon fiber spiral hoop, carbon fiber longitudinal reinforcement, I-steel, energy storage battery, current control device, detection device and ammeter; a plurality of carbon fiber longitudinal reinforcements are uniformly distributed in the pile structure body in the circumferential direction; the carbon fiber spiral hoop is bound on the periphery of the carbon fiber longitudinal reinforcement, and the contact point of the carbon fiber spiral hoop and the carbon fiber longitudinal reinforcement is insulated; the I-steel is placed at the geometric center of the pile structure body, the pile structure body is poured with concrete, and the probe of the detection device for detecting the corrosion condition of the I-steel is pre-buried, and the probe is a calomel electrode; the anode of the energy storage battery, the current control device, the ammeter, the carbon fiber spiral hoop, the I-steel and the cathode of the energy storage battery form a current loop for cathodic protection; one end of the detection device is electrically connected with the calomel electrode, and the other end is electrically connected with the I-steel. The application solves the problem of steel corrosion of the composite pile structure and improves the durability of the pile structure.

Description

Technical Field

[0001] This invention relates to the field of reinforced concrete cathodic protection technology, and more specifically, to pile structures that use carbon fiber spiral stirrups as self-powered cathodic protection. Background Technology

[0002] In surface-level composite pile structures, steel is susceptible to corrosion due to electrochemical reactions caused by oxygen and moisture in the air. Steel in piles extending deep underground is more vulnerable to corrosion from complex electrical currents and microorganisms. Corrosion reduces the cross-sectional area and strength of the steel, and the volume of corrosion products can be two to four times the original volume. This leads to rust expansion and cracking of the concrete cover, and even spalling, ultimately affecting the load-bearing capacity and durability of the composite pile structure.

[0003] Therefore, it is necessary to solve the problem of corrosion of structural piles. Summary of the Invention

[0004] In view of the above-mentioned defects in the prior art, the purpose of this invention is to solve the corrosion problem of I-beams in composite piles by using a portion of the current generated by renewable energy power generation. It provides a new type of composite pile structure that uses cathodic protection and combines I-beams, carbon fiber spiral stirrups, and carbon fiber longitudinal reinforcement to fundamentally solve the corrosion problem of I-beams in concrete piles.

[0005] To achieve the above objectives, the present invention provides a pile structure using carbon fiber spiral stirrups as self-powered cathodic protection, comprising: carbon fiber spiral stirrups, carbon fiber longitudinal bars, I-beams, concrete, energy storage battery, current control device, detection device, and ammeter.

[0006] Multiple carbon fiber longitudinal bars are located inside the pile structure body and are evenly distributed along the circumference of the pile structure body.

[0007] Carbon fiber spiral stirrups are tied around the carbon fiber longitudinal bars, and the contact points between the carbon fiber spiral stirrups and the carbon fiber longitudinal bars are insulated.

[0008] An I-beam is placed at the geometric center of the pile structure. The pile structure is made of concrete. During the pouring process, a probe for a detection device to detect corrosion of the I-beam is embedded. The probe is a calomel electrode.

[0009] Renewable energy generation devices charge energy storage batteries;

[0010] The I-beam is electrically connected to the negative terminal of the energy storage battery by a wire, and the carbon fiber spiral stirrup is electrically connected to the positive terminal of the energy storage battery by a wire. A current control device to control the current magnitude is connected in series between the positive terminal of the energy storage battery and the carbon fiber spiral stirrup. An ammeter is connected in series between the current control device and the carbon fiber spiral stirrup. The positive terminal of the energy storage battery, the current control device, the ammeter, the carbon fiber spiral stirrup, the I-beam, and the negative terminal of the energy storage battery form a current loop for cathodic protection.

[0011] One end of the testing device is electrically connected to the calomel electrode in the concrete by a wire, and the other end of the testing device is electrically connected to the I-beam by a wire.

[0012] Furthermore, the detection device is a multimeter, which is used to detect potential.

[0013] Furthermore, insulating rubber tubes are installed at the contact points between the carbon fiber spiral stirrups and the carbon fiber longitudinal reinforcement.

[0014] Furthermore, each carbon fiber longitudinal rib is individually connected to the spare anode terminal reserved for the spare replaceable anode using a wire;

[0015] When the carbon fiber spiral stirrup fails as the anode, disconnect the connection between the ammeter and the carbon fiber spiral stirrup, and connect the spare anode terminal with a wire attached to one end of the ammeter.

[0016] The beneficial effects of this invention are as follows:

[0017] This invention provides a pile structure suitable for using carbon fiber spiral stirrups as self-powered cathodic protection, which solves the problem of steel corrosion in composite pile structures and improves the durability of composite pile structures.

[0018] This invention provides a pile structure suitable for using carbon fiber spiral stirrups as self-powered cathodic protection. It combines renewable energy power generation with impressed current cathodic protection, using renewable energy power generation to provide power to the impressed current cathodic protection structure in the composite pile structure, thus ensuring the durability of the impressed current cathodic protection structure.

[0019] This invention provides a pile structure suitable for using carbon fiber spiral stirrups as self-powered cathodic protection. The structure replaces the ordinary combination of spiral stirrups and steel bars with a reinforcement configuration of carbon fiber spiral stirrups and carbon fiber longitudinal bars, improving the pile structure's corrosion resistance, inhibiting concrete rust expansion and cracking, and significantly extending the service life and durability of the composite pile. An I-beam is placed at the pile's geometric center, improving the overall strength and stiffness of the pile. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic cross-sectional view of the pile structure provided in an embodiment of the present invention;

[0022] Figure 2 This is a cross-sectional view of the pile structure provided in an embodiment of the present invention;

[0023] Figure 3 This is a schematic cross-sectional view of the pile structure when the carbon fiber spiral stirrups used as the anode fail, as provided in an embodiment of the present invention.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. I-beam; 2. Carbon fiber spiral stirrups; 3. Concrete; 4. Carbon fiber longitudinal reinforcement; 5. Detection device; 6. Energy storage battery; 7. Current control device; 8. Ammeter; 9. Calomel electrode; 10. Spare anode connector; 11. Insulating rubber tube; 12. Conductor; 13. Renewable energy power generation device. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] It should be noted that similar reference numerals or letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this invention, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] Example 1

[0029] like Figure 1-3The pile structure shown uses carbon fiber spiral stirrups as self-powered cathodic protection, including: carbon fiber spiral stirrups, carbon fiber longitudinal bars, I-beams, concrete, energy storage battery, current control device, detection device, and ammeter.

[0030] Multiple carbon fiber longitudinal bars are located inside the pile structure body and are evenly distributed along the circumference of the pile structure body.

[0031] Carbon fiber spiral stirrups are tied around the carbon fiber longitudinal bars, and the contact points between the carbon fiber spiral stirrups and the carbon fiber longitudinal bars are insulated.

[0032] An I-beam is placed at the geometric center of the pile structure. The pile structure is made of concrete. During the pouring process, a probe for a detection device to detect corrosion of the I-beam is embedded. The probe is a calomel electrode.

[0033] Renewable energy generation devices charge energy storage batteries;

[0034] The I-beam is electrically connected to the negative terminal of the energy storage battery by a wire, and the carbon fiber spiral stirrup is electrically connected to the positive terminal of the energy storage battery by a wire. A current control device to control the current magnitude is connected in series between the positive terminal of the energy storage battery and the carbon fiber spiral stirrup. An ammeter is connected in series between the current control device and the carbon fiber spiral stirrup. The positive terminal of the energy storage battery, the current control device, the ammeter, the carbon fiber spiral stirrup, the I-beam, and the negative terminal of the energy storage battery form a current loop for cathodic protection.

[0035] One end of the testing device is electrically connected to the calomel electrode in the concrete by a wire, and the other end of the testing device is electrically connected to the I-beam by a wire.

[0036] The I-beam 1 extends axially along the length of the pile, and its central axis coincides with the central axis of the circular concrete pile, serving as the core bending and compressive resistance skeleton of the pile. The carbon fiber longitudinal reinforcement 4 is arranged parallel to the length of the pile and is distributed circumferentially around the outer periphery of the I-beam 1. The carbon fiber spiral stirrup 2 is wrapped around the outer side of the carbon fiber longitudinal reinforcement 4, and at their intersection, an insulating rubber tube 11 is sleeved on the carbon fiber spiral stirrup 2 and tied and fixed with nylon cable ties to form a stable reinforcement cage skeleton.

[0037] The pile structure itself is located partially or entirely underground, making the environment relatively humid. The concrete pile body continuously absorbs moisture from the soil, keeping the interior moist. The concrete material itself contains a large number of hydroxide and calcium ions, creating a pore solution (electrolyte) within the concrete, thus generating a closed cathodic protection current loop. The minimum distance between the calomel electrode probe and the surface of the I-beam is 40mm, and the maximum is 150mm.

[0038] Preferably, the detection device is a multimeter, which is used to detect potential. According to the protection potential criterion, steel has corresponding protection potential ranges in different environments, and the corrosion status of the I-beam can be detected based on the protection potential range. The detection circuit is: positive electrode of the detection device - calomel electrode - I-beam - negative electrode of the detection device.

[0039] Preferably, an insulating rubber tube is provided at the contact point between the carbon fiber spiral stirrup and the carbon fiber longitudinal reinforcement.

[0040] Preferably, each carbon fiber longitudinal rib is individually connected to a spare anode terminal with a wire; more preferably, the top of each carbon fiber longitudinal rib is connected to an anode terminal.

[0041] When the carbon fiber spiral stirrup fails as the anode, disconnect the connection between the ammeter and the carbon fiber spiral stirrup, and connect the spare anode terminal with a wire attached to one end of the ammeter.

[0042] A spare anode connector is connected in parallel with all the carbon fiber longitudinal reinforcements. The main functions of the carbon fiber longitudinal reinforcements are twofold: first, to fix the carbon fiber spiral stirrups to form a stable reinforcement cage; and second, to serve as a spare anode. When the spiral stirrups fail as anodes, the ammeter can be connected through the spare anode connector on the carbon fiber longitudinal reinforcements to continue operating as an anode. In this case, the carbon fiber longitudinal reinforcements act as the new anodes, and the circuit consists of the positive terminal of the energy storage battery, the current control device, the ammeter, the carbon fiber longitudinal reinforcements, the I-beams, and the negative terminal of the energy storage battery. The pile structure itself is located partially or entirely underground, making the environment relatively humid. The concrete pile body continuously absorbs moisture from the soil, keeping the interior moist. The concrete material itself also contains a large number of hydroxide and calcium ions, resulting in the presence of a pore solution (electrolyte) within the concrete, thus creating a circuit.

[0043] When constructing the pile structure, S1 and multiple carbon fiber longitudinal bars are located within the pile structure body and are evenly distributed along the inner circumference of the circular pile section. Carbon fiber spiral hoops are tied to the outer periphery of the carbon fiber longitudinal bars with nylon cable ties, and insulating rubber tubes are installed at the contact points between the carbon fiber spiral hoops and the carbon fiber longitudinal bars.

[0044] S2. The I-beam is electrically connected to the negative terminal of the energy storage battery via a wire, and the carbon fiber spiral stirrup is electrically connected to the positive terminal of the energy storage battery via a wire. A current control device is connected in series between the positive terminal of the energy storage battery and the carbon fiber spiral stirrup to control the current magnitude. An ammeter is connected in series between the current control device and the carbon fiber spiral stirrup, so that the carbon fiber spiral stirrup, energy storage battery, current control device, I-beam, and ammeter form a closed circuit. Multiple carbon fiber longitudinal ribs are connected in parallel to reserve anode terminals.

[0045] S3, the reinforcement structure made of carbon fiber spiral stirrups and carbon fiber longitudinal bars is placed in the circular pile formwork, the I-beam is placed at the geometric center of the formwork, and the concrete is poured as a whole. During the pouring process, a detection device for detecting the corrosion of the I-beam is pre-embedded.

[0046] S4. Concrete pile curing: Construction shall proceed after the concrete piles have reached the required strength.

[0047] S5. The energy storage battery is charged by a renewable energy power generation device, and the current is changed by a current control device to provide DC power to the hybrid structure of carbon fiber spiral stirrups and I-beams.

[0048] S6. When the carbon fiber spiral stirrup fails as the anode, the wire between the ammeter and the spiral stirrup can be disconnected, and the spare anode terminal can be connected with the wire with the ammeter end to enable the impressed current cathodic protection structure to operate normally.

[0049] Example 2

[0050] This invention relates to a structural pile suitable for using carbon fiber spiral stirrups as self-powered cathodic protection, such as... Figure 1-3 As shown, it comprises two main structural bodies: the structural pile body and the impressed current cathodic protection structural body.

[0051] In the combined structural pile body, the built-in I-beam 1, carbon fiber spiral stirrups 2, carbon fiber longitudinal reinforcement 4, and insulating rubber tube 11 are all located within the concrete 3 of the structural pile body. Multiple carbon fiber longitudinal reinforcements 4 are evenly and symmetrically distributed along the circumference of the pile structure's cross-section, and the carbon fiber spiral stirrups 2 are wrapped around the outer periphery of the carbon fiber longitudinal reinforcements 4. In the impressed current cathodic protection structural body, the I-beam 1 is electrically connected to the negative terminal of the energy storage battery 6 by a wire 12, and the carbon fiber spiral stirrups 2 are electrically connected to the positive terminal of the energy storage battery 6 by a wire 12. A control device for the magnitude of the current is connected in series between the positive terminal of the energy storage battery 6 and the carbon fiber spiral stirrups 2. A current control device 7 and a current meter 8 are connected in series between the current control device 7 and the carbon fiber spiral stirrup 2, so that the I-beam 1, the carbon fiber spiral stirrup 2, the energy storage battery 6, the current control device 7, and the current meter 8 form a closed circuit; the renewable energy power generation device 13 is connected to the energy storage battery by a wire 12 to charge the energy storage battery; one end of the detection device 5 is electrically connected to the probe-calomel electrode 9 of the detection device in the concrete by a wire 12, and the other end of the detection device 5 is electrically connected to the I-beam 1 by a wire 12; each carbon fiber longitudinal rib 4 is separately led out with a spare anode terminal 10 as a replaceable spare anode.

[0052] After the concrete is poured, electricity is applied. Charge (electrons) flows from the energy storage battery through wires to the built-in I-beam 1 (cathode electrode), causing the built-in I-beam 1 to become cathode polarized and suppressing its oxidation reaction. Under the influence of the electric field, Moving away from the built-in I-beam 1 lowers the area around the built-in I-beam. The concentration provides protection for the built-in I-beam 1.

[0053] In this example, an insulating rubber tube 11 is installed at the contact point between the carbon fiber spiral stirrup 2 and the carbon fiber longitudinal rib 4, and the contact point between the carbon fiber spiral stirrup 2 and the carbon fiber longitudinal rib 4 is tied and fixed with nylon cable ties to prevent electrical connection between the carbon fiber spiral stirrup 2 and the carbon fiber longitudinal rib 4.

[0054] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the invention.

[0055] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A pile structure employing carbon fiber spiral stirrups as self-powered cathodic protection, characterized in that, include: Carbon fiber spiral stirrups, carbon fiber longitudinal reinforcement, I-beams, concrete, energy storage batteries, current control devices, detection devices, and ammeters; Multiple carbon fiber longitudinal bars are located inside the pile structure body and are evenly distributed along the circumference of the pile structure body. Carbon fiber spiral stirrups are tied around the carbon fiber longitudinal bars, and the contact points between the carbon fiber spiral stirrups and the carbon fiber longitudinal bars are insulated. An I-beam is placed at the geometric center of the pile structure. The pile structure is made of concrete. During the pouring process, a probe for a detection device to detect corrosion of the I-beam is embedded. The probe is a calomel electrode. Renewable energy generation devices charge energy storage batteries; The I-beam is electrically connected to the negative terminal of the energy storage battery by a wire, and the carbon fiber spiral stirrup is electrically connected to the positive terminal of the energy storage battery by a wire. A current control device to control the current magnitude is connected in series between the positive terminal of the energy storage battery and the carbon fiber spiral stirrup. An ammeter is connected in series between the current control device and the carbon fiber spiral stirrup. The positive terminal of the energy storage battery, the current control device, the ammeter, the carbon fiber spiral stirrup, the I-beam, and the negative terminal of the energy storage battery form a current loop for cathodic protection. One end of the testing device is electrically connected to the calomel electrode in the concrete by a wire, and the other end of the testing device is electrically connected to the I-beam by a wire.

2. The pile structure using carbon fiber spiral stirrups as self-powered cathodic protection according to claim 1, characterized in that, The detection device is a multimeter, which is used to detect potential.

3. The pile structure using carbon fiber spiral stirrups as self-powered cathodic protection according to claim 1, characterized in that, Insulating rubber tubes are installed at the contact points between the carbon fiber spiral stirrups and the carbon fiber longitudinal reinforcement.

4. The pile structure using carbon fiber spiral stirrups as self-powered cathodic protection according to claim 1, characterized in that, Each carbon fiber longitudinal rib is individually connected to the spare anode terminal with a wire; When the carbon fiber spiral stirrup fails as the anode, disconnect the connection between the ammeter and the carbon fiber spiral stirrup, and connect the end of the carbon fiber spiral stirrup connected to the ammeter to the spare anode terminal.

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