Self-sensing intelligent dehumidification system and method for stay cable lower anchor head

Abstract

The invention discloses a self-sensing intelligent dehumidification system and method for a stay cable lower anchor head. The system comprises a stay cable anchorage device, a self-sensing stay cable, a collecting and adjusting module and a dry air preparation station. The stay cable anchorage device comprises a wire separating plate, a high-strength steel wire hole, a gas conveying pipe hole, an exhaust pipe hole and a self-sensing cable wire hole are formed in the wire separating plate, a gas conveying pipe is arranged in the gas conveying pipe hole, and an exhaust pipe is arranged in the exhaust pipe hole. The high-strength steel wire holes are arrayed in a regular hexagon shape, the gas conveying pipe holes are formed in three adjacent top points at intervals in the hexagon section, and the self-sensing cable wire hole and the exhaust pipe hole are formed in the center of the hexagon section side by side; the self-sensing stay cable comprises a self-sensing cable wire and high-strength steel wires, the multiple high-strength steel wires are bundled into a whole to form a steel wire bundle, and the self-sensing cable wire is arranged in the center of the steel wire bundle. The collecting and adjusting module is connected with the self-sensing stay cable, and the dry air preparation station is connected with the air conveying pipe. By adopting the arrangement of'edge gas transmission and center exhaust ', the dehumidification effect of cable wires in 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] The cable is an important component that transfers the deadweight and vehicle load of the cable-stayed bridge to the bridge tower and foundation, and is inseparable from the safety of the bridge. The water vapor that penetrates into the cable body during the construction and operation period will cause corrosion of the steel wire, which not only reduces the effective bearing capacity of the steel wire, but also seriously affects the fatigue life of the steel wire and threatens the structural safety. Therefore, the anti-corrosion work of the cable is of great significance to the structural safety. The arrangement of dry air transmission and exhaust pipelines at the edge of the cable makes little change to the anchor structure, but most of the air flows along the outside and is discharged, and the dehumidification effect of the steel wire in the center of the cable body is difficult to guarantee. At the same time, the relative humidity of the dehumidification air supply of the main cable in China is currently controlled at 40-60%. This control data is derived from the relationship between the corrosion rate of the steel plane and the relative humidity. Under static parameters, the dehumidification system cannot adjust the power according to the current dehumidification effect and cable body humidity, and there may be problems of insufficient dehumidification efficiency (too low power) or ineffective energy consumption (too high power).

[0003] A Chinese patent with publication number CN111155415A discloses a dehumidification structure for an anchor head under a cable, comprising a fixed-end anchor, an anchor pad and a plurality of steel strands, wherein the plurality of steel strands are installed on the fixed-end anchor, 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, the steel strands extend from the cable duct through the seal, an air duct structure is pre-buried in the fixed-end anchor and dry air is input into the cable duct, the dry air is mixed with the original air in the cable duct and flows, and then returns to the inner cavity of the outer protective cover from the pre-buried air duct structure and the gap between the fixed-end anchor and the cable duct, thereby reducing the internal environmental humidity, thereby providing corrosion protection for the exposed parts of the fixed-end anchor and the steel strands.

[0004] In the Chinese patent with publication number CN111155415A, dry air enters from the air inlet of the lower anchor head and then is discharged from the exhaust hole of the lower anchor head. The distance traveled by the gas is short, the energy loss is relatively small, and the requirements for the air supply equipment are low. However, there is still the problem that the automatic sensing of temperature and humidity functions and intelligent adjustment cannot be realized, and the dehumidification effect is poor in the center of the cable body because the gas cannot be delivered. Therefore, a self-sensing intelligent dehumidification system and method for the lower anchor head of the inclined cable is needed, which integrates an intelligent cable with temperature and humidity self-sensing function to implement the detection of the dehumidification effect inside the cable body and realize the intelligent adjustment of the dehumidification system. Summary of the invention

[0005] In view of 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 wires. By adopting the arrangement of "edge air supply and center exhaust", 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 wire inside the inclined cable is improved. Intelligent cables with self-sensing functions of temperature and humidity 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 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 arranged on the anchor plate, and a wire dividing plate arranged 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] The high-strength steel wire hole is provided with a plurality of holes to form a high-strength steel wire hole array, the high-strength steel wire hole array is arranged in a regular hexagon, the gas transmission pipe holes are three, and are respectively arranged at three adjacent vertices in the hexagonal cross section of the high-strength steel wire hole array, and the self-sensing cable wire 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 inclined cable comprises a self-sensing cable wire and a high-strength steel wire. The high-strength steel wire is in multiple pieces and is 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" arrangement, the dehumidification effect of the internal cable of the inclined cable is improved.

[0011] Furthermore, the cable anchor also includes a protective cover arranged in the anchor plate, an anchor ring and an 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 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 a humidity grating measuring point, and the measuring point at the second end is a temperature grating measuring point;

[0014] The spiral wire armor is a stainless steel wire, which 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 the area 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 inclined 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 as a whole, and the sheath is a polyethylene sheath, which is processed by a hot extrusion process;

[0017] The self-sensing cable and 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 self-sensing cable there 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 cable 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 provided with a first air inlet pipeline and a second air inlet pipeline. The first air inlet pipeline is provided with a filter system. The input end of the filter system is connected to the outside air, and the output end is provided with a condenser. The output end of the condenser is connected to the input end of the dehumidifier moisture absorption zone. The output end of the dehumidifier moisture absorption zone is connected to a fan. The output end of the fan is connected to the input end of the cooler. The output end of the cooler is connected to a static pressure box, and the dehumidified dry air is output from the static pressure box. The second air inlet pipeline is provided with a heater. The input end of the heater is connected to the outside air, and the output end is connected to the input end of the dehumidifier regeneration zone. The output end of the dehumidifier regeneration zone 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 gas 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 temperature and humidity data in the anchor head under the inclined cable obtained by demodulation 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, starting 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, and the gas temperature is reduced to 10°C to 15°C. The control temperature of the condenser is adjusted by PLC control 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 to 140°C. The control temperature of the heater is adjusted by PLC control and recorded as control parameter C2;

[0031] S330, removing moisture from the air used to prepare dehumidified dry air in a dehumidifier with the assistance of air used in a dehumidifier regeneration process, thereby completing moisture absorption treatment;

[0032] S340, the dehumidified dry air after the dehumidification treatment is pressurized by the fan and sent to the cooler for cooling. The air flow rate of the fan is adjusted by PLC control, which is recorded as 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 is adjusted by PLC control, which is 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 then enters the lower anchor head of the inclined cable through the air 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;

[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 the regeneration zone of the rotary dehumidifier respectively;

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

[0037] S333, when the adsorption medium is saturated, the dehumidifier wheel 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, and the adsorbed water vapor is released under the heating of the high-temperature air used for the regeneration process of the rotary dehumidifier and is 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 LSTM neural network architecture, and obtain a set of PLC control parameters C1~C5 that optimally balance 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;

[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. A self-sensing intelligent dehumidification system for the anchor head of a cable-stayed cable of the present invention has an air supply pipe disposed on each of the three adjacent vertices of a regular hexagonal array of high-strength steel wires, and an exhaust pipe disposed at the center of the regular hexagonal array of high-strength steel wires. By adopting the arrangement of "edge air supply and center exhaust", 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 internal wires of the cable-stayed cable is improved.

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

[0046] 3. The self-sensing intelligent dehumidification system of the anchor head of the inclined cable of the present invention can significantly increase the air flow passing through the internal steel wire surface, avoiding the problem of the traditional "edge gas supply, 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 on the inside of 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 A schematic diagram of a stay cable anchor structure of a self-sensing intelligent dehumidification system for a stay cable anchor head according to an embodiment of the present invention;

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

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

[0051] Figure 5 This is a cross-sectional view of a self-sensing cable wire structure of a self-sensing intelligent dehumidification system for an anchor head under 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 A schematic 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 This is a specific flow chart 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] Fig. 9 This is a specific flow chart 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] Fig.10 This is the airflow vector diagram of the traditional "edge gas transmission + edge exhaust" dehumidification solution;

[0057] Fig.11 It is the airflow vector diagram of the dehumidification scheme of "edge gas transmission + central exhaust" of the present invention;

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

[0059] Fig.13 This is a cloud diagram of the air flow velocity distribution on the bottom surface of the anchor of the "edge air transmission + center exhaust" dehumidification solution of the present invention;

[0060] Fig.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 of the traditional "edge air supply + edge exhaust" and the "edge air supply + central exhaust" dehumidification schemes 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 cable 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-modulation 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 purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain 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 can be combined with each other as long as they do not conflict with each other.

[0063] Example 1

[0064] like Figure 1 As shown, the embodiment of the present invention provides a self-sensing intelligent dehumidification system for the anchor head of the inclined cable, comprising: an inclined cable anchor 1, a self-sensing inclined cable 2 arranged on the inclined cable anchor 1, a collection and adjustment module 3, and a dry air preparation station 4. The inclined cable anchor 1 is provided with a wire dividing plate 18, and the wire dividing plate 18 is provided with a high-strength steel wire hole, a gas transmission pipe hole, and an exhaust pipe hole, which are used to install high-strength steel wires, gas transmission pipes, and exhaust pipes. The high-strength steel wire holes are opened in multiples 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 transmission pipe holes, which are respectively arranged at three adjacent vertices in the hexagonal cross section of the high-strength steel wire hole array, and the exhaust pipe hole is arranged at the center of the hexagonal cross section of the high-strength steel wire hole array. By adopting the arrangement of "edge gas transmission and center exhaust", the problem of poor dehumidification effect near the center of the cable body is solved, and the dehumidification effect of dehumidified dry air on the cable wire inside the inclined cable is improved.

[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 a sealing structure is formed on the anchor cup 14. The connecting tube 17 is arranged at the top of the anchor cup 14 and fixedly connected thereto, and 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, and 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, thereby avoiding affecting the effect of the dehumidification system.

[0066] The wire dividing plate 18 is arranged at the bottom end of the anchor cup 14, and is provided with a self-sensing wire hole. The self-sensing wire 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 inclined cable 2 includes a self-sensing cable wire 21, a high-strength steel wire 22 and a sheath 23. The high-strength steel wire 22 is 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 steel wire bundle and is pressed together with the remaining high-strength steel wires 22. The sheath 23 is arranged outside the self-sensing cable wire 21 and the high-strength steel wire 22 to surround and fix them as a whole. The sheath 23 is a polyethylene sheath and is processed 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 engraved with temperature and humidity grating measuring points at intervals, and the measuring point of the sensing optical fiber 211 at the end of the anchor head under the inclined cable is a humidity grating measuring point, and the measuring point at the second end is a temperature grating measuring point. The spiral wire armor 212 is a stainless steel wire, which is rotated into a spiral shape and is sleeved on the outside of the sensing optical fiber 211. The steel casing 213 is a stainless steel tube with an outer diameter of 7mm, and the steel casing 213 is drilled with a plurality of small holes with a diameter of 1mm in the area corresponding to the humidity grating measuring point to ensure that the humidity inside and outside the steel casing 213 is the same.

[0069] The self-sensing cable wire 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 wire 21 there are dispersed, the self-sensing cable wire 21 is fixedly installed in the self-sensing cable wire 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. 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 input into the self-sensing inclined cable 2 through the air supply pipe, driving the moisture in the gap thereof to be discharged from the exhaust pipe, thereby achieving the purpose of dehumidification.

[0070] Preferably, a signal optical fiber is connected to the bottom end of the self-sensing cable 21, 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 4 and the anchoring 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 into different parts of the anchoring section of the self-sensing inclined cable 2. The smart steel wire with temperature and humidity measurement function can be used as a preferred alternative to the humidity sensor 31, the temperature sensor 32 and the 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, and 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 is connected to the data collector 34 and the adjustment 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 adjustment 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 up 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 filter 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, including two zones of regeneration and moisture absorption. The dry air preparation station 4 is provided with a first air intake pipeline and a second air intake pipeline. The first air intake pipeline is provided with a filter system 41, the input end of the filter system 41 is connected to the external 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 by 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 the static pressure box 47, and 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 external 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 filtering 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 sucked in by the second air intake line is heated by the heater 44 and then enters the regeneration area of ​​the dehumidifier 43, and is used for the regeneration process of the dehumidifier 43, and then is directly discharged to the external environment. The external air sucked in by the first air intake line is filtered and condensed and then enters the moisture absorption area of ​​the dehumidifier 43 to be prepared into dehumidified dry air for standby use.

[0075] Preferably, an integrated 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 the signal cable 33 pass through the integrated 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, connecting the gas transmission pipe to the output end of the dry air preparation station 4, importing the signal into the acquisition and adjustment module 3 through the signal optical fiber price of the self-sensing cable 21, and recording the temperature and humidity data in the anchor head under the inclined cable obtained by demodulation as the monitoring data M1;

[0079] S200, temperature and humidity sensors are installed at the input ports of the two air inlet pipelines of the dry air preparation station 4 to record 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 to dehumidify 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, and the gas temperature is reduced to 10°C to 15°C. The control temperature of the condenser is adjusted by PLC control 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 to 140°C. The control temperature of the heater is adjusted by 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 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 PLC control, which is recorded as 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 PLC control, which is 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 set 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 Fig. 9 As shown, step S330 specifically includes:

[0088] 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 rotary dehumidifier respectively;

[0089] S332, the adsorption medium of the dehumidifier 43 absorbs the moisture in the air used to prepare the dry air in the moisture absorption zone to prepare the 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, and the adsorbed water vapor is released under the heating of the high-temperature air used for the regeneration process of the rotary dehumidifier and is 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 value 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 obtains a set of PLC control parameters C1~C5 that optimally balance 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 ambient temperature, relative humidity and air flow rate of the intelligent cable-stayed dehumidification system at each stage, and the training indicators used are the measured humidity drop rate in the anchor head under the cable (monitoring data M1) and 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 preheating / precooling parameters for energy saving 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 a temperature below the air temperature consumes 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 dehumidified dry air precooling control target parameters.

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

[0103] Arranging the gas supply and exhaust pipes at the edge of the cable body without changing the cable body of the parallel wire cable is an intuitive gas supply / exhaust arrangement solution. There are many ways to implement the edge gas supply + edge exhaust solution, such as opening holes in the steel sleeve, pre-reserved air pipes in the cold cast / hot cast anchor body, or installing air clamps on the cable body PE sheath.

[0104] However, for cable components composed of parallel steel wires, the ideal situation in which dry air flows 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 in which 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 over the conventional "edge gas supply + edge exhaust" scheme in terms of dehumidification inside the cable body.

[0106] The CFD numerical analysis was carried out using FLUENT software. The CFD numerical simulation was only modeled for the air section within the anchor, which was 300 mm above the top surface of the cold-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, and a 1 / 6 isolation body is used for modeling.

[0109] In order to investigate the air velocity on the surface of the steel wire 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 cold cast anchor body, and 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 edge gas transmission + central exhaust arrangement of the present invention:

[0112] The 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. The exhaust pipe with an inner diameter of 8mm is arranged in the center of the inclined cable. A 1 / 6 isolation body is taken for modeling.

[0113] In order to investigate the air velocity on the surface of the steel wire inside the cable body, monitoring points were set at the center steel wire, the 1st to 4th layer of steel wires, near the outermost layer of steel wires, and near the top of the cold cast anchor body, and 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 are as follows: 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, and the dehumidification effect on the interior of the cable body is limited; adopting the edge air supply + center 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 protection scope of the present invention.

Claims

1. A self-sensing intelligent dehumidification system for the anchor head of a stay cable, characterized in that: It comprises 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) arranged on the anchor plate (11), and a wire dividing plate (18) arranged 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 arranged on the wire dividing plate (18); an air supply pipe is arranged in the air supply pipe hole, and an exhaust pipe is arranged in the exhaust pipe hole; The high-strength steel wire hole is provided with a plurality of holes to form a high-strength steel wire hole array, the high-strength steel wire hole array is arranged in a regular hexagon, the gas transmission pipe holes are three, and are respectively arranged at three adjacent vertices in the hexagonal cross section of the high-strength steel wire hole array, and the self-sensing cable wire 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 adjustment module (3) is connected to the self-sensing inclined 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 transmission and center exhaust" arrangement, the dehumidification effect of the internal cable of the inclined 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) arranged in the anchor plate (11), an anchor ring (13) and an anchor pipe (15) sleeved on the anchor cup (14), a connecting tube (17) arranged at the top end of the anchor cup (14), and a waterproof cover (16) arranged 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 1 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) which are 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 area corresponding to the humidity grating measuring points of the steel casing (213) 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 inclined cable (2) further comprises a sheath (23), which is arranged outside the self-sensing cable wire (21) and the high-strength steel wire (22) to surround and fix 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) there 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) comprises 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 gas supply pipe, the exhaust pipe, the signal optical fiber of the self-sensing cable (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) comprises a dehumidifier (43), which is a rotary dehumidifier including two zones: a regeneration zone and a moisture absorption zone; 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 filtering system (41). The input end of the filtering system (41) is connected to the external 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 a 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 by using a system as described in 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), importing the signal into the collection and adjustment module (3) through the signal optical fiber of the self-sensing cable (21), and recording the temperature and humidity data in the anchor head under 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 under the inclined 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, and the gas temperature is reduced to 10°C to 15°C. The control temperature of the condenser is adjusted by PLC control 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. to 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 assistance 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 PLC control and recorded as 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 PLC control and recorded as 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 lower anchor head of the inclined cable through the air 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 in the regeneration process of the dehumidifier (43) after the heating treatment enter the moisture absorption zone and the regeneration zone of the rotary dehumidifier respectively; S332, the adsorption medium of the dehumidifier (43) absorbs moisture in the air used to prepare dry air in the moisture absorption zone to prepare dry air; 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; S334, the saturated adsorption medium is driven by the rotor structure to the regeneration zone, and the adsorbed water vapor is released under the heating of the high-temperature air used for the regeneration process of the rotary dehumidifier and is 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 value 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 under the inclined cable according to claim 9, characterized in that: After step S300, the following steps are also included: S400, build machine learning training based on LSTM neural network architecture, and obtain a set of PLC control parameters C1~C5 that optimally balance 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; 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.

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