Suspension bridge main cable protective coating aging monitoring system

Abstract

The invention discloses a suspension bridge main cable protective coating aging monitoring system, which relates to the technical field of bridge anticorrosive coating monitoring and comprises a main cable and a cable clamp connected to the main cable. The sensor induction sheet is arranged on the cable clamp; the butt joint of the edge of the inner ring of the end face of the cable clamp and the straight seam is provided with an induction piece installation groove, the cable clamp is provided with a wiring groove connected with the induction piece installation groove, a sensor induction piece is arranged in the induction piece installation groove, a wire of the sensor induction piece is embedded in the wiring groove, and the outer surface of the cable clamp is coated with an anti-corrosion coating. The anti-corrosion coating covers the induction piece installation groove and the wiring groove, and the sensor induction piece detects the corrosion degree of the anti-corrosion coating in a mode of measuring alternating current impedance. According to the technical scheme, the aging condition of the protective coating of the bridge main cable is detected in a mode of measuring alternating current impedance, detection on the main cable can be reduced, the main cable is not prone to damage, and frequent replacement is not needed.

Description

Technical Field

[0001] The invention relates to the technical field of bridge anti-corrosion coating monitoring, and more specifically to an aging monitoring system for protective coatings of main cables of suspension bridges. Background Art

[0002] Bridge cables are important load-bearing structures in bridge engineering. Their corrosion protection effect is related to the safety and life of the bridge. They include the main cables, suspenders, and loose cables of suspension bridges, as well as various cables and related steel structures.

[0003] Chinese patent ZL99119397.0 discloses an anti-corrosion method for the main cable winding section of a suspension bridge. The structure from inside to outside is: phosphating primer, non-vulcanized rubber non-drying sealing paste layer, winding steel wire or strip winding layer, phosphating primer layer, epoxy iron oxide primer layer, polysulfide waterproof sealant layer, non-yellowing polyurethane topcoat layer. This technology has achieved positive results in engineering applications for more than ten years. However, since the polysulfide waterproof sealant layer uses a two-component polysulfide sealant, it is a two-component product that needs to be mixed on site before use. Manual mixing or high-speed disperser mixing under normal pressure is easy to mix into a large amount of air, resulting in a significant decrease in the shielding performance of the waterproof sealant layer. Corrosive media such as water vapor can easily pass through, significantly reducing its sealing and waterproof performance; in addition, the polysulfide sealant has a large viscosity, and it is difficult to scrape glue and finish the surface on site, and the work efficiency is low, resulting in a significant increase in construction costs.

[0004] After the main cable is protected against corrosion and fire, an anti-corrosion coating will be applied to the outermost layer. Generally, the damage of the anti-corrosion coating will pose a threat to the internal main cable structure. Therefore, the anti-corrosion coating needs to be tested. However, in the detection of the anti-corrosion coating, the damage of the anti-corrosion coating at the gap of the cable clamp structure is the most difficult to detect, resulting in detection loopholes.

[0005] Therefore, how to provide a system that can monitor the aging of the protective coating of the main cable of the suspension bridge, especially to detect the gap of the cable clamp, is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0006] In view of this, the present invention provides an aging monitoring system for protective coating of a suspension bridge main cable, aiming to solve the above technical problems.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A system for monitoring aging of protective coating of main cable of suspension bridge comprises main cable and cable clamp connected to the main cable; and further comprises: a sensor sensing sheet arranged on the cable clamp;

[0009] The inner ring edge of the end face of the cable clamp and the joint of the straight seam are both provided with a sensing piece installation groove, the cable clamp is provided with a wiring groove connected to the sensing piece installation groove, the sensing piece installation groove is provided with the sensor sensing piece, the wires of the sensor sensing piece are embedded in the wiring groove, the outer surface of the cable clamp is coated with an anti-corrosion coating, the anti-corrosion coating covers the sensing piece installation groove and the wiring groove, and the sensor sensing piece detects the degree of corrosion of the anti-corrosion coating by measuring AC impedance.

[0010] Through the above technical scheme, the present invention provides a technical scheme for detecting the aging condition of the protective coating of the bridge main cable by measuring AC impedance. In particular, the present invention focuses on detecting the gap at the connection between the cable clamp and the main cable. Generally, the coating at the gap is more easily damaged. However, due to structural limitations, the coating at the gap is more difficult to detect. By adopting the scheme provided by the present invention, the detection of the main cable can be reduced, and the overall status of the main cable can be reflected from local detection, which has a simpler and more effective detection effect. In addition, the present invention is not easy to be damaged and does not require frequent replacement.

[0011] Preferably, in the above-mentioned main cable protective coating aging monitoring system of a suspension bridge, the sensor piece installation groove includes a first sensor piece installation groove provided on the inner edge of the cable clamp end face, a second sensor piece installation groove provided on the straight seam of the cable clamp end face, and a third sensor piece installation groove provided on the straight seam of the cable clamp outer circumferential surface, and the first sensor piece installation groove, the second sensor piece installation groove and the third sensor piece installation groove are all bonded with sensor sensor pieces. By providing the first sensor piece installation groove, the second sensor piece installation groove and the third sensor piece installation groove, the annular seam and the straight seam of the cable clamp can be covered, and a more comprehensive detection effect can be achieved.

[0012] Preferably, in the above-mentioned main cable protective coating aging monitoring system of a suspension bridge, the surface of the sensor sensing piece is flush with the opening edge of the sensor piece installation slot, so that the opening of the installation slot and the setting of the sensor sensing piece can be integrated with the original structure of the cable clamp to prevent the later design structure from interfering with the original structure.

[0013] Preferably, in the above-mentioned main cable protective coating aging monitoring system of a suspension bridge, the wiring groove includes a first wiring groove opened on the inner edge of the end face of the cable clamp and connected to the first sensor plate installation groove, a second wiring groove opened on the straight seam on the outer surface of the cable clamp and connected to the second sensor plate installation groove and the third sensor plate installation groove, and a third wiring groove opened inside the cable clamp and connected to the first sensor plate installation groove and the third sensor plate installation groove. The wiring groove is designed in conjunction with the installation groove, which has an excellent effect.

[0014] Preferably, in the above-mentioned main cable protective coating aging monitoring system for suspension bridges, the conductors are arranged from the first wiring trough to the third wiring trough and the second wiring trough in sequence. The design of the wiring trough is more to meet the damage to the coating caused by the abnormal movement of the conductors. Therefore, the conductors are arranged in order according to the wiring troughs, and the matching structure of the cable clamp and the main cable can be used to restrict the conductors so that the conductors will not move abnormally and the coating will not be damaged.

[0015] Preferably, in the above-mentioned main cable protective coating aging monitoring system for suspension bridges, the wiring trough is filled with corrosion-resistant silica gel, which wraps the wire and is flush with the surface of the cable clamp, so as to further limit the stability of the wire and at the same time prevent the overall structure of the cable clamp from being damaged.

[0016] Preferably, in the above-mentioned suspension bridge main cable protective coating aging monitoring system, it also includes an electrical signal acquisition device connected to the wire, which is used to acquire the electrical signal of the sensor sensing sheet and detect the corrosion degree of the anti-corrosion coating by measuring the AC impedance. The electrical signal acquisition device can realize the acquisition of signals to meet the detection requirements.

[0017] Preferably, in the above-mentioned main cable protective coating aging monitoring system of a suspension bridge, a locking clamp is further included, and the locking clamp is locked and buckled at both ends of the cable clamp to compress the wire. The design of the locking clamp can ultimately meet the restriction of the wire and enhance the stability, preventing the abnormal movement of the wire from affecting the damage of the coating.

[0018] Preferably, in the above-mentioned main cable protective coating aging monitoring system for suspension bridges, the locking clamp is composed of two separate clamp structures, which are easy to connect.

[0019] Preferably, in the above-mentioned main cable protective coating aging monitoring system for suspension bridges, the anti-corrosion coating covers the connection gap between the cable clamp and the main cable, which can meet the detection requirements.

[0020] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a suspension bridge main cable protective coating aging monitoring system, which has the following beneficial effects:

[0021] 1. The present invention provides a technical solution for detecting the aging condition of the protective coating of the bridge main cable by measuring AC impedance. In particular, the present invention focuses on detecting the gap at the connection between the cable clamp and the main cable. Generally, the coating at the gap is more easily damaged. However, due to structural limitations, the coating at the gap is more difficult to detect. By adopting the solution provided by the present invention, the detection of the main cable can be reduced, and the overall status of the main cable can be reflected from local detection, which has a simpler and more effective detection effect. In addition, the present invention is not easy to be damaged and does not need to be replaced frequently.

[0022] 2. The present invention can cover the annular seam and the straight seam of the cable clamp by setting the first sensor plate installation groove, the second sensor plate installation groove and the third sensor plate installation groove, and has a more comprehensive detection effect.

[0023] 3. The design of the wiring trough of the present invention is more to meet the damage to the coating caused by abnormal movement of the wires. Therefore, the wires are arranged in order according to the wiring trough, and the matching structure of the cable clamp and the main cable can be used to restrict the wires so that the wires will not move abnormally and the coating will not be damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0025] Figure 1 The accompanying drawing is a front view of the structure of the main cable and the cable clamp connection provided by the present invention;

[0026] Figure 2 The accompanying drawing is a side view of the structure of the main cable and the cable clamp connection provided by the present invention;

[0027] Figure 3 The accompanying drawing is a front view of the structure of the cable clamp provided by the present invention;

[0028] Figure 4 The accompanying drawing is a cross-sectional view of the structure of the cable clamp provided by the present invention;

[0029] Figure 5 The accompanying drawing is a bottom view of the structure of the cable clamp provided by the present invention;

[0030] Figure 6 The accompanying drawing is a schematic diagram of electrical connection provided by the present invention.

[0031] in:

[0032] 1- Main cable;

[0033] 2-cable clamp;

[0034] 21-sensor sheet installation slot; 211-first sensor sheet installation slot; 212-second sensor sheet installation slot; 213-third sensor sheet installation slot; 22-wiring slot; 221-first wiring slot; 222-second wiring slot; 223-third wiring slot;

[0035] 3-Sensor sensing sheet;

[0036] 4-Electrical signal acquisition device;

[0037] 5- Lock the clamp;

[0038] 6- Wires. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] See attached Figure 1 To Attachment Figure 6 The embodiment of the present invention discloses a system for monitoring the aging of protective coating of a main cable of a suspension bridge, comprising a main cable 1 and a cable clamp 2 connected to the main cable 1; and further comprising: a sensor sensing sheet 3 arranged on the cable clamp 2;

[0041] The inner edge of the end face of the cable clamp 2 and the joint of the straight seam are both provided with a sensing piece installation groove 21, and the cable clamp 2 is provided with a wiring groove 22 connected to the sensing piece installation groove 21. A sensor sensing piece 3 is arranged in the sensing piece installation groove 21, and the wire 6 of the sensor sensing piece 3 is embedded in the wiring groove 22. The outer surface of the cable clamp 2 is coated with an anti-corrosion coating, and the anti-corrosion coating covers the sensing piece installation groove 21 and the wiring groove 22. The sensor sensing piece 3 detects the corrosion degree of the anti-corrosion coating by measuring the AC impedance.

[0042] In order to further optimize the above technical solution, the sensing piece installation groove 21 includes a first sensing piece installation groove 211 opened on the inner circle edge of the end face of the cable clamp 2, a second sensing piece installation groove 212 opened on the straight seam of the end face of the cable clamp 2, and a third sensing piece installation groove 213 opened on the straight seam of the outer circumferential surface of the cable clamp 2. The first sensing piece installation groove 211, the second sensing piece installation groove 212 and the third sensing piece installation groove 213 are all bonded with the sensor sensing piece 3.

[0043] In order to further optimize the above technical solution, the surface of the sensor sensing piece 3 is flush with the opening edge of the sensing piece installation groove 21 .

[0044] In order to further optimize the above technical solution, the wiring groove 22 includes a first wiring groove 221 opened on the inner circle edge of the end face of the cable clamp 2 and connected to the first sensor plate mounting groove 211, a second wiring groove 222 opened on the straight seam on the outer surface of the cable clamp 2 and connected to the second sensor plate mounting groove 212 and the third sensor plate mounting groove 213, and a third wiring groove 223 opened inside the cable clamp 2 and connected to the first sensor plate mounting groove 211 and the third sensor plate mounting groove 213.

[0045] In order to further optimize the above technical solution, the conductor 6 is arranged from the first wiring groove 221 to the third wiring groove 223 and the second wiring groove 222 in sequence.

[0046] In order to further optimize the above technical solution, the wiring groove 22 is filled with corrosion-resistant silicone, which wraps the wire 6 and is flush with the surface of the cable clamp 2 .

[0047] In order to further optimize the above technical solution, an electrical signal acquisition device 4 connected to the wire 6 is also included to collect the electrical signal of the sensor sensing sheet 3 and detect the corrosion degree of the anti-corrosion coating by measuring AC impedance.

[0048] In order to further optimize the above technical solution, a locking hoop 5 is also included. The locking hoop 5 is locked and buckled on the two ends of the cable clamp 2 to compress the wire 6.

[0049] In order to further optimize the above technical solution, the locking hoop 5 is composed of two split hoop body structures.

[0050] In order to further optimize the above technical solution, an anti-corrosion coating covers the connection gap between the cable clamp 2 and the main cable 1.

[0051] In this embodiment, the wire 6 connected to the sensor plate in the first sensor plate installation groove 211 passes through the first wiring groove 221 and the third wiring groove 223, is input into the cable clamp 2, and then merges with the wire 6 of the sensor plate in the third sensor plate installation groove 213, and then passes through the second wiring groove 222, and finally returns to the end of the cable clamp 2, and is finally tightened and positioned by the locking hoop 5.

[0052] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0053] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A system for monitoring the aging of protective coatings on main cables of suspension bridges, comprising a main cable (1) and a cable clamp (2) connected to the main cable (1); characterized in that: Also includes: A sensor sensing sheet (3) on the cable clamp (2); The inner edge of the end face of the cable clamp (2) and the joint of the straight seam are both provided with a sensing piece installation groove (21); the cable clamp (2) is provided with a wiring groove (22) connected to the sensing piece installation groove (21); the sensing piece installation groove (21) is provided with the sensor sensing piece (3); the wire (6) of the sensor sensing piece (3) is embedded in the wiring groove (22); the outer surface of the cable clamp (2) is coated with an anti-corrosion coating, the anti-corrosion coating covers the sensing piece installation groove (21) and the wiring groove (22); the sensor sensing piece (3) detects the corrosion degree of the anti-corrosion coating by measuring AC impedance.

2. The system for monitoring aging of protective coating of main cable of suspension bridge according to claim 1 is characterized in that: The sensing piece installation groove (21) comprises a first sensing piece installation groove (211) provided on the inner edge of the end face of the cable clamp (2), a second sensing piece installation groove (212) provided on the straight seam of the end face of the cable clamp (2), and a third sensing piece installation groove (213) provided on the straight seam of the outer circumferential surface of the cable clamp (2), wherein the first sensing piece installation groove (211), the second sensing piece installation groove (212) and the third sensing piece installation groove (213) are all bonded with the sensor sensing piece (3).

3. The system for monitoring aging of protective coating of main cable of suspension bridge according to claim 2 is characterized in that: The surface of the sensor sensing sheet (3) is flush with the opening edge of the sensing sheet installation groove (21).

4. The system for monitoring aging of protective coating of main cable of suspension bridge according to claim 2 is characterized in that: The wiring groove (22) comprises a first wiring groove (221) opened on the inner edge of the end surface of the cable clamp (2) and connected to the first sensor plate installation groove (211), a second wiring groove (222) opened on the straight seam of the outer surface of the cable clamp (2) and connected to the second sensor plate installation groove (212) and the third sensor plate installation groove (213), and a third wiring groove (223) opened inside the cable clamp (2) and connected to the first sensor plate installation groove (211) and the third sensor plate installation groove (213).

5. The system for monitoring aging of protective coating of main cable of suspension bridge according to claim 4 is characterized in that: The conductor (6) is arranged in a direction from the first wiring groove (221) to the third wiring groove (223) and the second wiring groove (222) in sequence.

6. The system for monitoring aging of protective coating of main cable of suspension bridge according to claim 1, characterized in that: The wiring groove (22) is filled with corrosion-resistant silica gel, which wraps the wire (6) and is flush with the surface of the cable clamp (2).

7. The system for monitoring aging of protective coating of main cable of suspension bridge according to claim 1, characterized in that: It also includes an electrical signal acquisition device (4) connected to the wire (6) for acquiring the electrical signal of the sensor sensing sheet (3) and detecting the corrosion degree of the anti-corrosion coating by measuring AC impedance.

8. The system for monitoring aging of protective coating of main cable of suspension bridge according to claim 1, characterized in that: It also comprises a locking hoop (5), wherein the locking hoop (5) is locked and fastened on the two ends of the cable clamp (2) to compress the wire (6).

9. The system for monitoring aging of protective coating of main cable of suspension bridge according to claim 8, characterized in that: The locking hoop (5) is composed of two separate hoop body structures.

10. The system for monitoring aging of protective coating of main cable of suspension bridge according to claim 1, characterized in that: The anti-corrosion coating covers the connection gap between the cable clamp (2) and the main cable (1).

Images