A self-sensing intelligent dehumidification system and method for the anchor head under the inclined cable

Abstract

The present invention discloses a self-sensing intelligent dehumidification system and method for the anchor head of a stay cable. The system comprises: a stay cable anchor, a self-sensing stay cable, a collection and regulation module, and a dry air preparation station. The stay cable anchor comprises a wire dividing plate, on which are provided a high-strength steel wire hole, a gas transmission pipe hole, an exhaust pipe hole, and a self-sensing wire hole. The gas transmission pipe hole is provided within the gas transmission pipe, and the exhaust pipe hole is provided within the exhaust pipe hole. The high-strength steel wire holes are arranged in a regular hexagonal array, with the gas transmission pipe hole located at three adjacent vertices of the hexagonal cross-section. The self-sensing wire hole and the exhaust pipe hole are located side by side at the center of the hexagonal cross-section. The self-sensing stay cable comprises a self-sensing cable wire and a high-strength steel wire. Multiple high-strength steel wires are bundled together to form a steel wire bundle, with the self-sensing wire wire located at the center of the steel wire bundle. The collection and regulation module is connected to the self-sensing stay cable, and the dry air preparation station is connected to the gas transmission pipe. By adopting an "edge gas transmission, center exhaust" arrangement, the dehumidification effect of the wires inside the stay cable is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of dehumidification of inclined cables, and more specifically, relates to a self-sensing intelligent dehumidification system and method for an anchor head under an inclined cable. Background Art

[0002] Stay cables are crucial components for transmitting the deadweight and vehicle loads of cable-stayed bridges to the towers and foundations, making them inextricably linked to bridge safety. Moisture intruding into the cable during construction and operation can cause corrosion of the steel wires, reducing their effective load-bearing capacity and severely impacting their fatigue life, threatening structural safety. Therefore, corrosion prevention of stay cables is crucial for structural safety. While placing dry air supply and exhaust ducts at the edges of the stay cables requires minimal structural modification, most of the air flows outward before being exhausted, making it difficult to ensure effective dehumidification of the steel wires located in the center of the cable. Furthermore, the relative humidity of the air supply for dehumidification of main cables in China is currently controlled between 40% and 60%. This control data is derived from the relationship between the corrosion rate of steel surfaces and relative humidity. Under static parameters, the dehumidification system cannot adjust its power based on the current dehumidification performance and cable humidity, potentially resulting in insufficient dehumidification efficiency (too low power) or inefficient energy consumption (too high power).

[0003] Chinese patent publication number CN111155415A discloses a dehumidification structure for the anchor head under the inclined cable, including a fixed-end anchor, an anchor pad and a plurality of steel strands. The plurality of steel strands are installed in the fixed-end anchor, and the fixed-end anchor is located in the anchor pad. One end of the cable duct is sealed with the anchor pad, and the other end is internally sealed by a seal. The fixed-end anchor and the steel strands are partially accommodated in the cable duct, and the steel strands extend from the cable duct through the seal. The air duct structure is pre-buried in the fixed-end anchor and inputs dry air into the cable duct. The dry air mixes with the original air in the cable duct and flows back to the inner cavity of the outer protective cover through the gap between the pre-buried air duct structure and the fixed-end anchor and the cable duct, thereby reducing the internal environmental humidity, thereby providing anti-corrosion protection for the exposed parts of the fixed-end anchor and the steel strands.

[0004] In Chinese patent application CN111155415A, dry air enters through the lower anchor head air inlet and exits through the lower anchor head exhaust port. This shortens the distance traveled by the air, resulting in relatively low energy loss and lower requirements for air supply equipment. However, this system still lacks automatic temperature and humidity sensing and intelligent adjustment capabilities. Furthermore, the central portion of the cable body is unable to receive air, resulting in poor dehumidification. Therefore, a self-sensing intelligent dehumidification system and method for the lower anchor head of a stay cable is needed. This system integrates intelligent cables with temperature and humidity self-sensing capabilities to monitor the dehumidification effect within the cable body and enable intelligent adjustment of the dehumidification system. Summary of the Invention

[0005] In response to the above defects or improvement needs of the prior art, the present invention provides a self-sensing intelligent dehumidification system and method for the lower anchor head of an inclined cable, wherein an air supply pipe is arranged on each of the three adjacent vertices of the regular hexagonal array of high-strength steel wires, an exhaust pipe is arranged at the center of the regular hexagonal array of high-strength steel wires, and a self-sensing cable wire is arranged in parallel with the exhaust pipe at the center of the high-strength steel wire. By adopting the "edge air supply and center exhaust" arrangement, the problem of poor dehumidification effect near the center of the cable body is solved, and the dehumidification effect of the dehumidified dry air on the cable wires inside the inclined cable is improved. Intelligent cables with self-sensing temperature and humidity functions are integrated to detect the dehumidification effect inside the cable body. By adopting LSTM neural network control technology, intelligent adjustment of the dehumidification system is realized, and the problem of lack of basis for static setting of the operating parameters of the dehumidification system parameters is solved.

[0006] To achieve the above objectives, according to a first aspect of an embodiment of the present invention, a self-sensing intelligent dehumidification system for an anchor head under a stay cable is provided, comprising a stay cable anchor, a self-sensing stay cable, a collection and adjustment module, and a dry air preparation station;

[0007] The stay cable anchor comprises an anchor plate, an anchor cup provided on the anchor plate, and a wire dividing plate provided at the bottom end of the anchor cup. The wire dividing plate is provided with a high-strength steel wire hole, an air supply pipe hole, an exhaust pipe hole, and a self-sensing cable wire hole. The air supply pipe hole is provided with an air supply pipe, and the exhaust pipe hole is provided with an exhaust pipe.

[0008] There are multiple high-strength steel wire holes to form a high-strength steel wire hole array, and the high-strength steel wire hole array is arranged in a regular hexagon. There are three gas pipe holes, which are respectively arranged at three adjacent vertices in the hexagonal cross-section of the high-strength steel wire hole array. The self-sensing cable hole and the exhaust pipe hole are arranged side by side at the center position of the hexagonal cross-section of the high-strength steel wire hole array.

[0009] The self-sensing stay cable comprises a self-sensing cable wire and a high-strength steel wire. The high-strength steel wire is in multiple pieces and neatly bundled together to form a steel wire bundle. The self-sensing cable wire is arranged at the center of the steel wire bundle.

[0010] The collection and regulation module is connected to the self-sensing inclined cable, and the dry air preparation station is connected to the air pipeline to provide it with dehumidified dry air. By adopting the "edge air supply and center exhaust" layout, the dehumidification effect of the internal cable wires of the inclined cable is improved.

[0011] Furthermore, the stayed cable anchor also includes a protective cover arranged in the anchor plate, an anchor ring and anchor pipe sleeved on the anchor cup, a connecting tube arranged at the top of the anchor cup, and a waterproof cover arranged between the anchor pipe and the self-sensing stayed cable.

[0012] Furthermore, the self-sensing cable comprises a sensing optical fiber, a spiral wire armor and a steel casing arranged in sequence from the inside to the outside;

[0013] The sensing optical fiber is inscribed with temperature and humidity grating measuring points at intervals, and the measuring point of the sensing optical fiber at the end of the anchor head under the inclined cable is the humidity grating measuring point, and the measuring point at the second end is the temperature grating measuring point;

[0014] The spiral wire armor is a stainless steel wire that is rotated into a spiral shape and is sheathed on the outside of the sensing optical fiber;

[0015] The steel casing is a stainless steel pipe, and a plurality of small holes are drilled on the steel casing in areas corresponding to the humidity grating measuring points to ensure that the humidity inside and outside the steel casing is the same.

[0016] Furthermore, the self-sensing stay cable also includes a sheath, which is arranged outside the self-sensing cable wire and the high-strength steel wire to surround and fix them into a whole, and the sheath is a polyethylene sheath processed by a hot extrusion process;

[0017] The self-sensing cable and the high-strength steel wire at the anchor end of the self-sensing cable are not covered with a sheath, and the high-strength steel wires and the self-sensing cable are dispersed. The self-sensing cable is fixedly installed in the self-sensing cable on the wire dividing plate, and the high-strength steel wire is fixedly installed in the high-strength steel wire hole on the wire dividing plate.

[0018] Furthermore, the acquisition and adjustment module includes a humidity sensor, a temperature sensor, a signal cable, a data collector and a mediation device;

[0019] The humidity sensor and the temperature sensor are provided in plurality and are interspersed with the signal cables at different positions of the anchoring section of the self-sensing inclined cable.

[0020] Furthermore, the bottom end of the self-sensing cable is connected to a signal optical fiber, and a comprehensive outlet is reserved at the bottom of the protective cover;

[0021] The gas supply pipe, the exhaust pipe, the signal optical fiber of the self-sensing rope and the signal cable pass through the integrated outlet and are connected to the collection and regulation module and the dry air preparation station.

[0022] Furthermore, the dry air preparation station includes a dehumidifier, which is a rotary dehumidifier including two zones: regeneration and moisture absorption;

[0023] The dry air preparation station is equipped with a first air inlet pipeline and a second air inlet pipeline. The first air inlet pipeline is equipped with a filtration system, the input of which is connected to the outside air, and the output of which is equipped with a condenser. The output of the condenser is connected to the input of the dehumidifier's moisture absorption zone, which is then connected to a fan. The output of the fan is connected to the input of a cooler, which is then connected to a static pressure tank. The dehumidified dry air is output from the static pressure tank. The second air inlet pipeline is equipped with a heater, the input of which is connected to the outside air, and the output of the heater is connected to the input of the dehumidifier's regeneration zone, which is also connected to a fan.

[0024] According to a second aspect of an embodiment of the present invention, a self-sensing intelligent dehumidification method for an anchor head under a stay cable is provided, comprising the following steps:

[0025] S100, connecting the air transmission pipe to the output end of the dry air preparation station, importing the signal into the acquisition and adjustment module through the signal optical fiber of the self-sensing cable, and recording the demodulated temperature and humidity data inside the anchor head of the inclined cable as monitoring data M1;

[0026] S200, installing temperature and humidity sensors at the input ports of the two air inlet pipelines of the dry air preparation station to record the temperature and relative humidity data of the ambient air as monitoring data M2;

[0027] S300: Start the dry air preparation station to prepare dehumidified dry air to dehumidify the self-sensing inclined cables.

[0028] Furthermore, step S300 is specifically as follows:

[0029] S310, the air used to prepare the dehumidified dry air passes through the filtration system and enters the condenser for cooling, reducing the gas temperature to 10°C to 15°C. The control temperature of the condenser is adjusted by the PLC and recorded as control parameter C1;

[0030] S320, the air used for the dehumidifier regeneration process enters the heater and is heated to 100°C~140°C. The control temperature of the heater is adjusted by PLC control and recorded as control parameter C2;

[0031] S330: The air used to prepare the dehumidified dry air is removed from the air in the dehumidifier with the assistance of the air used in the dehumidifier regeneration process, thereby completing the moisture absorption process;

[0032] S340: The dehumidified dry air after dehumidification is pressurized and sent to the cooler for cooling by a fan. The air flow rate of the fan is adjusted by the PLC control and recorded as control parameter C4. A temperature and humidity sensor is installed at the fan to record the temperature and relative humidity of the dehumidified dry air during this stage as monitoring data M3. The set value of the dry air temperature in the cooler is adjusted by the PLC control and recorded as control parameter C5.

[0033] S350: The cooled dehumidified dry air enters the static pressure box, stabilizes the airflow and reduces airflow vibration, and is then delivered through the air pipeline to the interior of the anchor head under the inclined cable for dehumidification. A temperature and humidity sensor and flow meter are installed at the dry air outlet, and the temperature, relative humidity, and flow rate of the discharged dehumidified dry air are recorded as monitoring data M4.

[0034] Step S330 specifically includes:

[0035] S331, the low-temperature air for preparing dehumidified dry air after the cooling treatment and the high-temperature air for the dehumidifier regeneration process after the heating treatment enter the moisture absorption zone and regeneration zone of the rotary dehumidifier respectively;

[0036] S332, the adsorption medium of the dehumidifier absorbs moisture in the air used to prepare dry air by drying the adsorption medium in the moisture absorption zone to prepare dry air;

[0037] S333, when the adsorption medium is saturated, the dehumidifier's rotor structure is rotated to replace the saturated adsorption medium in the moisture absorption zone with the unsaturated adsorption medium;

[0038] S334: The saturated adsorption medium is driven by the rotor structure to the regeneration zone, where it is heated by the high-temperature air used in the regeneration process of the rotary dehumidifier, and the adsorbed water vapor is released and carried away by the flowing high-temperature air and discharged to the external environment through the fan;

[0039] S335. The key parameters for the operation of the dehumidifier are the target relative humidity and temperature of the low-temperature air moisture absorption treatment in the moisture absorption zone, which are adjusted through PLC control and recorded as control parameter C3.

[0040] Furthermore, after step S300, the following steps are further included:

[0041] S400: Build machine learning training based on the LSTM neural network architecture to derive a set of PLC control parameters C1-C5 that optimally balance the humidity drop rate in the anchor head under the stay cable and system power consumption under the environmental conditions containing the test data M1-M5.

[0042] S500 , applying the obtained control parameters C1 - C5 to the corresponding nodes of the intelligent dehumidification step, and adjusting the control parameters C1 - C5 in real time according to the changes of the detection data M1 - M5 .

[0043] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0044] 1. The present invention provides a self-sensing intelligent dehumidification system for the anchor head of a stay cable. An air supply pipe is installed at each of three adjacent vertices of a regular hexagonal array of high-strength steel wires, and an exhaust pipe is installed at the center of the regular hexagonal array of high-strength steel wires. By adopting an "edge-to-edge air supply and center-to-center exhaust" arrangement, the system solves the problem of poor dehumidification near the center of the cable body and improves the dehumidification effect of dehumidified dry air on the internal wires of the stay cable.

[0045] 2. The present invention provides a self-sensing intelligent dehumidification system for the lower anchor head of a stay cable. A self-sensing cable wire is arranged at the center of the high-strength steel wire in parallel with the exhaust pipe. The intelligent cable wire with temperature and humidity self-sensing functions is integrated to detect the dehumidification effect inside the cable body. The intelligent adjustment of the dehumidification system is achieved by adopting LSTM neural network control technology, which solves the problem of lack of basis for static setting of the dehumidification system operating parameters.

[0046] 3. The self-sensing intelligent dehumidification system for the lower anchor head of a stay cable of the present invention can significantly increase the airflow passing through the internal steel wire surface, avoiding the problem of the traditional "edge-input, edge-exhaust" arrangement in which most of the dehumidified dry air flows along the periphery of the cable body to the exhaust port, resulting in limited dehumidification effect inside the cable body. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a structural schematic diagram of a self-sensing intelligent dehumidification system for an anchor head under a stay cable according to an embodiment of the present invention;

[0048] Figure 2 This is a schematic diagram of the structure of a stay cable anchor of a self-sensing intelligent dehumidification system for the anchor head of a stay cable according to an embodiment of the present invention;

[0049] Figure 3 This is a cross-sectional view of a self-sensing cable structure of a self-sensing intelligent dehumidification system at the lower anchor head of a cable according to an embodiment of the present invention;

[0050] Figure 4 This is a schematic diagram of a self-sensing cable structure of a self-sensing intelligent dehumidification system for a cable lower anchor head according to an embodiment of the present invention;

[0051] Figure 5 This is a cross-sectional view of the self-sensing cable structure of a self-sensing intelligent dehumidification system for an anchor head of a stay cable according to an embodiment of the present invention;

[0052] Figure 6 This is a schematic diagram of the structure of a collection and adjustment module of a self-sensing intelligent dehumidification system for an anchor head under a stay cable according to an embodiment of the present invention;

[0053] Figure 7 This is a flow chart of a self-sensing intelligent dehumidification method for an anchor head under a stay cable according to an embodiment of the present invention;

[0054] Figure 8 Schematic diagram of the specific process of step S300 in a self-sensing intelligent dehumidification method for an anchor head under a stay cable according to an embodiment of the present invention;

[0055] Figure 9 Schematic diagram of the specific process of step S330 in a self-sensing intelligent dehumidification method for an anchor head under a stay cable according to an embodiment of the present invention;

[0056] Figure 10 This is the airflow vector diagram of the traditional "edge gas supply + edge exhaust" dehumidification solution;

[0057] Figure 11 This is the airflow vector diagram of the "edge gas transmission + central exhaust" dehumidification solution of the present invention;

[0058] Figure 12 This is a cloud diagram of the airflow velocity distribution on the bottom surface of the anchor for the traditional "edge air supply + edge exhaust" dehumidification solution;

[0059] Figure 13 This is a cloud diagram of the airflow velocity distribution on the bottom surface of the anchor for the "edge air supply + central exhaust" dehumidification solution of the present invention;

[0060] Figure 14 This is a comparison chart of the average steady-state air flow rate on the surface of the central steel wire of the cable body for the traditional "edge air supply + edge exhaust" dehumidification scheme and the "edge air supply + central exhaust" dehumidification scheme of the present invention.

[0061] In all the drawings, the same reference numerals represent the same technical features, specifically: 1- cable anchor, 11- anchor plate, 12- protective cover, 13- anchor ring, 14- anchor cup, 15- anchor pipe, 16- waterproof cover, 17- connecting tube, 18- wire dividing plate, 2- self-sensing cable, 21- self-sensing wire, 211- sensing optical fiber, 212- spiral wire armor, 213- steel casing, 22- high-strength steel wire, 23- sheath, 3- acquisition and adjustment module, 31- humidity sensor, 32- temperature sensor, 33- signal cable, 34- data collector, 35- mediation equipment, 351- temperature demodulator, 352- humidity demodulator, 353- grating demodulator, 4- dry air preparation station, 41- filtration system, 42- condenser, 43- dehumidifier, 44- heater, 45- fan, 46- cooler, 47- static pressure box. DETAILED DESCRIPTION

[0062] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to illustrate the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0063] Example 1

[0064] like Figure 1 As shown, an embodiment of the present invention provides a self-sensing intelligent dehumidification system for the anchor head of a stay cable, comprising: a stay cable anchor 1, a self-sensing stay cable 2 mounted on the stay cable anchor 1, a collection and adjustment module 3, and a dry air preparation station 4. The stay cable anchor 1 is provided with a wire dividing plate 18, which is provided with holes for high-strength steel wires, gas supply pipes, and exhaust pipes for installing the high-strength steel wires, gas supply pipes, and exhaust pipes. Multiple high-strength steel wire holes are provided, forming a high-strength steel wire hole array arranged in a regular hexagonal pattern. Three gas supply pipe holes are located at three adjacent vertices of the hexagonal cross-section of the high-strength steel wire hole array, and the exhaust pipe hole is located at the center of the hexagonal cross-section of the high-strength steel wire hole array. By adopting a "edge-to-edge air supply, center-to-center exhaust" arrangement, the problem of poor dehumidification near the center of the cable body is resolved, improving the dehumidification effect of the dehumidified dry air on the cable wires within the stay cable.

[0065] like Figure 2 As shown, the cable anchor 1 also includes an anchor plate 11, a protective cover 12, an anchor ring 13, an anchor cup 14, an anchor pipe 15, a waterproof cover 16, and a connecting tube 17. The anchor plate 11 is fixedly connected to the steel structure bridge deck by welding. The protective cover 12 and the anchor cup 14 are both arranged in the anchor plate 11. The anchor ring 13 and the anchor pipe 15 are sleeved on the anchor cup 14, and the anchor pipe 15 is arranged on the top of the anchor ring 13. The anchor pipe 15 is a tubular structure and forms a sealing structure on the anchor cup 14. The connecting tube 17 is arranged at the top of the anchor cup 14 and fixedly connected to it. The anchor ring 13 sleeved on the outside of the anchor cup 14 is locked, so that the connecting tube 17 squeezes the anchor end of the self-sensing cable 2 to complete the fixation. The anchor end of the self-sensing cable 2 passes through the connecting tube 17 and the anchor cup 14 from top to bottom. The waterproof cover 16 is assembled from two semi-vertebrae, with the end with a larger diameter connected to the top of the anchor pipe 15, and the end with a smaller diameter is sleeved on the cable body of the self-sensing inclined cable 2, and fixed to the polyethylene sheath on the outside of the cable body of the self-sensing inclined cable 2, and is used to form protection on the top of the inclined cable anchor 1, so that a seal is formed between the anchor pipe 15 and the self-sensing inclined cable 2, preventing external water from entering the inclined cable anchor 1 along the open end of the anchor pipe 15, causing corrosion and rust to the structure therein, and avoiding affecting the effect of the dehumidification system.

[0066] The wire dividing plate 18 is provided at the bottom end of the anchor cup 14 and is provided with a self-sensing cable hole. The self-sensing cable hole and the exhaust pipe hole are arranged side by side at the center of the hexagonal cross section of the high-strength steel wire hole array.

[0067] like Figure 3 、 4 As shown, the self-sensing stay cable 2 includes a self-sensing cable wire 21, a high-strength steel wire 22, and a sheath 23. The high-strength steel wires 22 are multiple and neatly bundled together to form a steel wire bundle. The self-sensing cable wire 21 replaces the high-strength steel wire 22 at the center of the bundle and is compressed together with the remaining high-strength steel wires 22. The sheath 23 is provided outside the self-sensing cable wire 21 and the high-strength steel wire 22, enclosing and securing them as a whole. The sheath 23 is a polyethylene sheath manufactured by a hot extrusion process.

[0068] like Figure 5 As shown, the self-sensing cable 21 includes a sensing optical fiber 211, a spiral wire armor 212, and a steel casing 213 arranged in sequence from the inside to the outside. The sensing optical fiber 211 is inscribed with temperature and humidity grating measurement points at intervals, and the measurement point of the sensing optical fiber 211 at the end of the anchor head of the inclined cable is a humidity grating measurement point, and the measurement point at the second end is a temperature grating measurement point. The spiral wire armor 212 is a stainless steel wire that is rotated into a spiral shape and is sheathed on the outside of the sensing optical fiber 211. The steel casing 213 is a stainless steel tube with an outer diameter of 7 mm. The steel casing 213 is drilled with multiple small holes with a diameter of 1 mm in the area corresponding to the humidity grating measurement points to ensure that the humidity inside and outside the steel casing 213 is the same.

[0069] The self-sensing cable 2 has no sheath 23 on the self-sensing cable wires 21 and high-strength steel wires 22 at the anchor end. The high-strength steel wires 22 and self-sensing cable wires 21 are dispersed. The self-sensing cable wires 21 are fixedly mounted within the self-sensing cable wires on the wire dividing plate 18, and the high-strength steel wires 22 are fixedly mounted within the high-strength steel wire holes on the wire dividing plate 18. An air supply pipe is also provided in the air supply pipe hole on the wire dividing plate 18, and an exhaust pipe is also provided in the exhaust pipe hole. Dry air is supplied to the self-sensing cable 2 through the air supply pipe, driving moisture in the gaps therebetween and discharging it through the exhaust pipe, thereby achieving the purpose of dehumidification.

[0070] Preferably, the bottom end of the self-sensing cable 21 is connected to a signal optical fiber, and the data monitored by the self-sensing cable 21 is transmitted through the signal optical fiber.

[0071] The collection and adjustment module 3 includes a humidity sensor 31, a temperature sensor 32, a signal cable 33, a data collector 34 and a mediation device 35, wherein the temperature sensor 32 and the signal cable 33 are installed in a similar manner to the three air intake pipes, and are also linearly inserted into the gap between the anchor cup 14 and the anchor section of the self-sensing inclined cable 2, and are arranged in parallel with the parallel steel wires. In order to improve data accuracy, multiple humidity sensors 31, temperature sensors 32 and signal cables 33 are inserted in different parts of the anchor section of the self-sensing inclined cable 2. The smart steel wire with temperature and humidity measurement function can be used as an optimal alternative to the humidity sensor 31, temperature sensor 32 and signal cable 33; further, three temperature sensors 32 are respectively arranged near different air intake pipes, and the depth of the arrangement and insertion is consistent with the depth of the adjacent air intake pipe ends. The humidity sensor 31 is arranged in parallel next to the temperature sensor 32; further, a data line hole is set at the wire dividing plate 18 for passing the signal cable 33. One end of the signal cable 33 is connected to the temperature sensor 32 and the humidity sensor 31 in the anchor cup 14 respectively, and the other end is introduced into the steel box girder and connected to the data collector 34 and the mediation device 35 in sequence. The temperature and humidity detection data are transmitted to the data collector 34 for recording through the signal cable 33, and then sent to the mediation device 35 by the data collector 34 for data demodulation, and finally sent to the control computer for staff to search. The collection and adjustment module 3 transmits the data of different areas in the anchor cup 14 to the control computer by setting multiple groups of temperature and humidity sensors or smart steel wires, and then starts the relevant devices through the control computer to perform ventilation, dehumidification, temperature control and other operations, thereby realizing long-term continuous monitoring and control of the inclined cable steel wire.

[0072] like Figure 6 As shown, the dry air preparation station 4 includes a filtration system 41, a condenser 42, a dehumidifier 43, a heater 44, a fan 45, a cooler 46, and a static pressure box 47. The dehumidifier 43 is a rotary dehumidifier, comprising two zones: regeneration and moisture absorption. The dry air preparation station 4 is provided with a first air inlet pipeline and a second air inlet pipeline. The first air inlet pipeline is provided with a filtration system 41, the input of which is connected to the outside air, and the output of which is provided with a condenser 42. The output of the condenser 42 is connected to the input of the moisture absorption zone of the dehumidifier 43. The output of the moisture absorption zone of the dehumidifier 43 is connected to a fan 45, the output of which is connected to the input of a cooler 46. The output of the cooler 46 is connected to a static pressure box 47, from which the dehumidified dry air is output. The second air inlet pipeline is provided with a heater 44 , the input end of the heater 44 is connected to the outside air, and the output end is connected to the input end of the regeneration zone of the dehumidifier 43 . The output end of the regeneration zone of the dehumidifier 43 is also connected to a fan 45 .

[0073] The filtration system 41 includes, from the input end to the output end, a pre-filter, a chemical filter, a fiber filter, and a HEPA filter. The pre-filter is used to filter solid particles of 10 microns in the air; the chemical filter is used to remove harmful sulfur and nitrogen oxides in the air; the fiber filter is used to remove chloride ions in the air; and the HEPA filter is used to remove solid particles larger than 0.1 microns.

[0074] Preferably, the external air drawn in by the second air inlet line is heated by heater 44 and then enters the regeneration zone of dehumidifier 43 for use in the regeneration process of dehumidifier 43, and is then directly discharged into the external environment. The external air drawn in by the first air inlet line is filtered and condensed before entering the moisture absorption zone of dehumidifier 43 to be prepared as dehumidified dry air for standby use.

[0075] Preferably, a comprehensive outlet is reserved at the bottom of the protective cover 12, and the air supply pipe, exhaust pipe, signal optical fiber of the self-sensing rope 21 and signal cable 33 pass through the comprehensive outlet and are connected to the collection and adjustment module 3 and the dry air preparation station 4.

[0076] Example 2

[0077] like Figure 7 As shown, an embodiment of the present invention provides a self-sensing intelligent dehumidification method for an anchor head under a stay cable, comprising the following steps:

[0078] S100, connect the air transmission pipe to the output end of the dry air preparation station 4, import the signal into the acquisition and adjustment module 3 through the signal optical fiber price of the self-sensing cable 21, and record the temperature and humidity data inside the anchor head of the inclined cable obtained by demodulation as monitoring data M1;

[0079] S200, installing temperature and humidity sensors at the input ports of the two air inlet pipelines of the dry air preparation station 4, and recording the temperature and relative humidity data of the ambient air as monitoring data M2;

[0080] S300 , starting the dry air preparation station 4 to prepare dehumidified dry air for dehumidifying the self-sensing inclined cables 2 .

[0081] like Figure 8 As shown, step S300 is specifically as follows:

[0082] S310, the air used to prepare the dehumidified dry air passes through the filtration system and enters the condenser for cooling, reducing the gas temperature to 10°C to 15°C. The control temperature of the condenser is adjusted by the PLC and recorded as control parameter C1;

[0083] S320, the air used for the regeneration process of the dehumidifier 43 enters the heater and is heated to 100°C~140°C. The control temperature of the heater is adjusted by the PLC control and recorded as control parameter C2;

[0084] S330: The air used to prepare the dehumidified dry air is removed from the air in the dehumidifier 43 with the assistance of the air used in the regeneration process of the dehumidifier 43, thereby completing the moisture absorption process;

[0085] S340: The dehumidified dry air after the dehumidification process is pressurized by fan 45 and sent to cooler 46 for cooling. The air flow rate of the fan is adjusted by PLC control and recorded as control parameter C4. A temperature and humidity sensor is installed at the fan to record the temperature and relative humidity of the dehumidified dry air during this stage as monitoring data M3. The set value of the dry air temperature in cooler 46 is adjusted by PLC control and recorded as control parameter C5.

[0086] S350. The cooled dehumidified dry air enters the static pressure box 47, stabilizes the airflow and reduces airflow vibration, and then is input into the lower anchor head of the inclined cable through the air pipeline for dehumidification. A temperature and humidity sensor and a flow meter are installed at the dry air outlet to record the temperature, relative humidity and flow of the discharged dehumidified dry air as monitoring data M4.

[0087] like Figure 9 As shown, step S330 specifically includes:

[0088] S331, the low-temperature air for preparing dehumidified dry air after the cooling treatment and the high-temperature air for the regeneration process of the dehumidifier 43 after the heating treatment enter the moisture absorption zone and regeneration zone of the rotary dehumidifier respectively;

[0089] S332, the adsorption medium of the dehumidifier 43 absorbs the moisture in the air used to prepare dry air in the moisture absorption zone to prepare dry air;

[0090] S333, when the adsorption medium is saturated, the rotor structure of the dehumidifier 43 is rotated to replace the saturated adsorption medium in the moisture absorption zone with the unsaturated adsorption medium;

[0091] S334: The saturated adsorption medium is driven by the rotor structure to the regeneration zone, where it is heated by the high-temperature air used in the regeneration process of the rotary dehumidifier, and the adsorbed water vapor is released and carried away by the flowing high-temperature air and discharged to the external environment through the fan;

[0092] S335. The key parameters for the operation of the dehumidifier 43 are the target relative humidity and temperature of the low-temperature air moisture absorption treatment in the moisture absorption zone, which are adjusted through PLC control and recorded as control parameter C3.

[0093] Preferably, the dehumidified dry air produced in step S300 is controlled to have a temperature in the range of 20° C. to 25° C. and a relative humidity in the range of 34% to 40%.

[0094] Preferably, the power consumption generated during the operation of the dry air preparation station 4 is recorded as monitoring data M5.

[0095] After step S300, the following steps are also included:

[0096] S400, based on the LSTM neural network architecture, builds machine learning training and derives a set of PLC control parameters C1~C5 that achieve the optimal balance between the humidity drop rate in the anchor head under the inclined cable and the system power consumption under the environmental conditions containing the detection data M1~M5.

[0097] S500 , applying the obtained control parameters C1 - C5 to the corresponding nodes of the intelligent dehumidification step, and adjusting the control parameters C1 - C5 in real time according to the changes of the detection data M1 - M5 .

[0098] In step S400, when setting up machine learning training, the input data includes parameters including the ambient temperature, relative humidity, and air flow rate of the intelligent cable-stayed dehumidification system at each stage. The training indicators used are the measured humidity drop rate in the anchor head of the cable (monitoring data M1) and the system power consumption (monitoring data M5).

[0099] Preferably, the LSTM neural network training result is implicit, and different training results may be obtained for different bridge structures, geographical environments, and equipment performances.

[0100] The regeneration temperature and thermal power control of the dehumidifier 43 are important control parameters that affect the energy consumption of the dry air preparation station. Therefore, the most direct control parameters are C1 and C2. The external input conditions are the external air temperature and humidity environment M2. During the system trial operation phase, the LSTM neural network algorithm is used to collect data and train the control model under different working conditions. When the external air is in different states, the optimal energy-saving preheating / precooling parameters are given to determine the regeneration temperature and heating power control of the dehumidification system.

[0101] The warm dry air prepared in the moisture absorption zone is cooled by a cooler (control parameter C5), which can reduce the saturated vapor pressure of water vapor and improve the efficiency of removing water vapor. However, cooling the dry air to below the air temperature requires additional energy. During the system trial operation phase, the LSTM neural network algorithm is used to collect data and train the control model under different working conditions to provide the target control parameters for dehumidified dry air pre-cooling.

[0102] like Figure 10-14 As shown, numerical simulations are performed on the traditional scheme and the scheme of the present invention:

[0103] Placing the gas supply and exhaust ducts at the edge of the cable body, without modifying the parallel wire cable body, is an intuitive gas supply / exhaust arrangement. This edge-input and edge-exhaust solution can be implemented in a variety of ways, including drilling holes in the steel sleeve, pre-reserving gas ducts in the cold-cast or hot-cast anchor body, or installing gas clamps on the cable body's PE sheath.

[0104] However, for cable components composed of parallel steel wires, the ideal situation of dry air flowing through all internal and external steel wire surfaces is not necessarily met. The flow path of dry air in the anchor environment will vary significantly with the arrangement of the gas supply and exhaust ports. There may also be a situation where the dry air flows rapidly along the path of least resistance (i.e., the gaps between the steel wires along the longitudinal direction of the cable) and has almost no effect on the steel wires far away from the gas supply and exhaust ports.

[0105] Computational Fluid Dynamics (CFD) analysis was carried out to verify the advantages of the "edge gas supply + center exhaust" scheme proposed in the present invention in dehumidifying the interior of the cable body compared with the conventional "edge gas supply + edge exhaust" scheme.

[0106] The CFD numerical analysis was performed using FLUENT software. The CFD numerical simulation was only performed on the air section within the anchor, which was 300 mm above the top surface of the chill-cast anchor cup.

[0107] Conventional edge gas supply + edge exhaust layout simulation:

[0108] At the six corner points of the parallel steel wire stay cables, a "3+3" gas supply pipe and exhaust pipe are arranged at intervals. The inner diameter of the gas supply pipe is 5mm, and the depth of the anchor is 150mm. The inner diameter of the exhaust pipe is 6mm. A 1 / 6 isolator is used for modeling.

[0109] To investigate the air velocity on the surface of the steel wires inside the cable body, monitoring points were set at the center steel wire, the 1st to 4th layer steel wires, and near the top of the chill-cast anchor body. The air velocity at these points was calculated in the simulation analysis.

[0110] A total of four boundary conditions are set in the CFD model: inflow, outflow, symmetry surface and wall. The inflow boundary is the starting end of the gas pipeline, which is the inflow boundary with a given pressure of 5 kPa; the outflow boundary is the end of the exhaust pipe, which is the outflow boundary with a given pressure of 0 Pa.

[0111] Simulation of the edge gas supply + central exhaust arrangement of the present invention:

[0112] Gas pipes are arranged at the three corner points of the parallel steel wire inclined cables. The inner diameter of the gas pipes is 5mm, and the depth into the anchor is 150mm. The inner diameter of the exhaust pipe is 6mm. An exhaust pipe with an inner diameter of 8mm is arranged in the center of the inclined cable, and a 1 / 6 isolator is taken for modeling.

[0113] To investigate the air velocity on the surface of the steel wires inside the cable body, monitoring points were set at the center steel wire, the 1st to 4th layer steel wires, near the outermost layer steel wires, and near the top of the chill-cast anchor body. The air velocity at these points was calculated in the simulation analysis.

[0114] A total of four boundary conditions are set in the CFD model: inflow, outflow, symmetry surface and wall. The inflow boundary is the starting end of the gas pipeline, which is the inflow boundary with a given pressure of 5 kPa; the outflow boundary is the end of the exhaust pipe, which is the outflow boundary with a given pressure of 0 Pa.

[0115] The simulation results show that when using the conventional edge air supply + edge exhaust arrangement, most of the dehumidified dry air flows along the periphery of the cable body to the exhaust port, which has limited dehumidification effect on the interior of the cable body; while the edge air supply + central exhaust arrangement proposed by the present invention can significantly increase the air flow passing through the internal steel wire surface.

[0116] It will be easily understood by those skilled in the art that 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 scope of protection of the present invention.

Claims

1. A self-sensing intelligent dehumidification system for the anchor head of a stay cable, characterized in that: It includes a stay cable anchor (1), a self-sensing stay cable (2), a collection and adjustment module (3), and a dry air preparation station (4); The stay cable anchor (1) comprises an anchor plate (11), an anchor cup (14) provided on the anchor plate (11), and a wire dividing plate (18) provided at the bottom end of the anchor cup (14); a high-strength steel wire hole, an air supply pipe hole, an exhaust pipe hole, and a self-sensing cable wire hole are provided on the wire dividing plate (18); an air supply pipe is provided in the air supply pipe hole, and an exhaust pipe is provided in the exhaust pipe hole; There are multiple high-strength steel wire holes to form a high-strength steel wire hole array, and the high-strength steel wire hole array is arranged in a regular hexagon. There are three gas pipe holes, which are respectively arranged at three adjacent vertices in the hexagonal cross-section of the high-strength steel wire hole array. The self-sensing cable hole and the exhaust pipe hole are arranged side by side at the center position of the hexagonal cross-section of the high-strength steel wire hole array. The self-sensing inclined cable (2) comprises a self-sensing cable wire (21) and a high-strength steel wire (22), wherein the high-strength steel wire (22) is a plurality of wires which are neatly bundled together to form a steel wire bundle, and the self-sensing cable wire (21) is arranged at the center of the steel wire bundle; The collection and regulation module (3) is connected to the self-sensing stay cable (2), and the dry air preparation station (4) is connected to the air pipeline to provide it with dehumidified dry air. By adopting the "edge air supply and center exhaust" arrangement, the dehumidification effect of the internal wires of the stay cable is improved.

2. The self-sensing intelligent dehumidification system for the anchor head of the inclined cable according to claim 1 is characterized in that: The stay cable anchor (1) further comprises a protective cover (12) provided in the anchor plate (11), an anchor ring (13) and an anchor pipe (15) sleeved on the anchor cup (14), a connecting tube (17) provided at the top end of the anchor cup (14), and a waterproof cover (16) provided between the anchor pipe (15) and the self-sensing stay cable (2).

3. The self-sensing intelligent dehumidification system for the anchor head of the inclined cable according to claim 2 is characterized in that: The self-sensing cable (21) comprises a sensing optical fiber (211), a spiral wire armor (212), and a steel casing (213) arranged in sequence from the inside to the outside; The sensing optical fiber (211) is inscribed with temperature and humidity grating measurement points at intervals, and the measurement point of the sensing optical fiber (211) at the end of the anchor head under the inclined cable is a humidity grating measurement point, and the measurement point at the second end is a temperature grating measurement point; The spiral wire armor (212) is a stainless steel wire, which is processed into a spiral shape by rotation and is sheathed on the outside of the sensing optical fiber (211); The steel casing (213) is a stainless steel tube, and a plurality of small holes are drilled in the steel casing (213) in areas corresponding to humidity grating measurement points, so as to ensure that the humidity inside and outside the steel casing (213) is the same.

4. The self-sensing intelligent dehumidification system for the anchor head of the inclined cable according to claim 3 is characterized in that: The self-sensing stay cable (2) further comprises a sheath (23), which is arranged outside the self-sensing cable wire (21) and the high-strength steel wire (22), surrounding and fixing them into a whole, and the sheath (23) is a polyethylene sheath, which is processed by a hot extrusion process; The self-sensing cable (21) and the high-strength steel wire (22) at the anchoring end of the self-sensing inclined cable (2) are not provided with a sheath (23), and the high-strength steel wires (22) and the self-sensing cable (21) at this location are dispersed, the self-sensing cable (21) is fixedly installed in the self-sensing cable on the wire dividing plate (18), and the high-strength steel wire (22) is fixedly installed in the high-strength steel wire hole on the wire dividing plate (18).

5. A self-sensing intelligent dehumidification system for the anchor head of a stay cable according to any one of claims 2 to 4, characterized in that: The acquisition and adjustment module (3) includes a humidity sensor (31), a temperature sensor (32), a signal cable (33), a data collector (34) and a adjustment device (35); The humidity sensor (31) and the temperature sensor (32) are provided in plurality, and are interspersed with the signal cable (33) at different locations of the anchoring section of the self-sensing inclined cable (2).

6. A self-sensing intelligent dehumidification system for the anchor head of a stay cable according to any one of claims 2 to 4, characterized in that: The bottom end of the self-sensing cable (21) is connected to a signal optical fiber, and a comprehensive outlet is reserved at the bottom of the protective cover (12); The air delivery pipe, the exhaust pipe, the signal optical fiber of the self-sensing wire (21), and the signal cable (33) pass through the integrated outlet and are connected to the collection and regulation module (3) and the dry air preparation station (4).

7. A self-sensing intelligent dehumidification system for the anchor head of a stay cable according to any one of claims 2 to 4, characterized in that: The dry air preparation station (4) includes a dehumidifier (43), which is a rotary dehumidifier including two zones: regeneration and moisture absorption; The dry air preparation station (4) is provided with a first air inlet pipeline and a second air inlet pipeline. The first air inlet pipeline is provided with a filter system (41). The input end of the filter system (41) is connected to the outside air, and the output end is provided with a condenser (42). The output end of the condenser (42) is connected to the input end of the moisture absorption zone of the dehumidifier (43). The output end of the moisture absorption zone of the dehumidifier (43) is connected to a fan (45). The output end of the fan (45) is connected to the input end of the cooler (46). The output end of the cooler (46) is connected to a static pressure box (47). The dehumidified dry air is output from the static pressure box (47). The second air inlet pipeline is provided with a heater (44), the input end of the heater (44) is connected to the outside air, and the output end is connected to the input end of the regeneration zone of the dehumidifier (43), and the output end of the regeneration zone of the dehumidifier (43) is also connected to a fan (45).

8. A self-sensing intelligent dehumidification method for an anchor head under a stay cable, implemented using the system according to any one of claims 1 to 7, characterized in that: The following steps are involved: S100, connecting the air transmission pipe to the output end of the dry air preparation station (4), introducing the signal into the acquisition and adjustment module (3) through the signal optical fiber of the self-sensing cable (21), and recording the temperature and humidity data inside the anchor head of the inclined cable obtained by demodulation as monitoring data M1; S200, installing temperature and humidity sensors at the input ports of the two air inlet pipelines of the dry air preparation station (4), and recording the temperature and relative humidity data of the ambient air as monitoring data M2; S300, starting the dry air preparation station (4) to prepare dehumidified dry air to dehumidify the self-sensing inclined cable (2).

9. The self-sensing intelligent dehumidification method for the anchor head of a stay cable according to claim 8, characterized in that: Step S300 is specifically as follows: S310, the air used to prepare the dehumidified dry air passes through the filtration system and enters the condenser for cooling, reducing the gas temperature to 10°C to 15°C. The control temperature of the condenser is adjusted by the PLC and recorded as control parameter C1; S320, the air used for the regeneration process of the dehumidifier (43) enters the heater and is heated to 100°C~140°C. The control temperature of the heater is adjusted by PLC control and recorded as control parameter C2; S330, the air used to prepare the dehumidified dry air is removed from the air in the dehumidifier (43) with the aid of the air used in the regeneration process of the dehumidifier (43), thereby completing the moisture absorption process; S340, the dehumidified dry air after the dehumidification treatment is pressurized by the fan (45) and sent to the cooler (46) for cooling. The air flow rate of the fan is adjusted by the PLC control and recorded as the control parameter C4. A temperature and humidity sensor is set at the fan to record the temperature and relative humidity of the dehumidified dry air at this stage as monitoring data M3. The set value of the dry air temperature in the cooler (46) is adjusted by the PLC control and recorded as the control parameter C5. S350, the cooled dehumidified dry air enters the static pressure box (47), stabilizes the airflow and reduces airflow vibration, and then enters the interior of the anchor head under the inclined cable through the air transmission pipeline for dehumidification. A temperature and humidity sensor and a flow meter are set at the dry air outlet, and the temperature, relative humidity and flow rate of the discharged dehumidified dry air are recorded as monitoring data M4; Step S330 specifically includes: S331, the low-temperature air used to prepare the dehumidified dry air after the cooling treatment and the high-temperature air used for the regeneration process of the dehumidifier (43) after the heating treatment enter the moisture absorption zone and the regeneration zone of the dehumidifier (43) respectively; S332, the adsorption medium of the dehumidifier (43) absorbs moisture in the air used to prepare dry air in the moisture absorption zone, thereby preparing dry air; S333, when the adsorption medium is saturated, the dehumidifier (43) is rotated to replace the saturated adsorption medium in the moisture absorption zone with the unsaturated adsorption medium; S334, the saturated adsorption medium is driven by the rotor structure to the regeneration zone, where it is heated by the high-temperature air used in the regeneration process of the dehumidifier (43), where the adsorbed water vapor is released and carried away by the flowing high-temperature air and discharged to the external environment through the fan; S335. The key parameters for the operation of the dehumidifier (43) are the target relative humidity and temperature of the low-temperature air moisture absorption treatment in the moisture absorption zone, which are adjusted through PLC control and recorded as control parameter C3.

10. The self-sensing intelligent dehumidification method for the anchor head of a stay cable according to claim 9, characterized in that: After step S300, the following steps are also included: S400: Build machine learning training based on the LSTM neural network architecture to derive a set of PLC control parameters C1-C5 that optimally balance the humidity drop rate in the anchor head under the stay cable and system power consumption under the environmental conditions containing the test data M1-M5. S500, applying the obtained control parameters C1-C5 to the corresponding nodes of the intelligent dehumidification step, and adjusting the control parameters C1-C5 in real time according to the changes of the detection data M1-M5; The monitoring data M5 is the power consumption generated during the operation of the dry air preparation station (4).

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