Drainage and dehumidification system and method for pull sling embedded pipe based on differential pressure double circulation

Abstract

The invention discloses a pull sling embedded pipe drainage and dehumidification system and method based on differential pressure double circulation, and belongs to the technical field of bridge engineering. The system comprises a sealing unit for sealing an embedded pipe so that a closed space can be formed in the embedded pipe; the communication unit is used for communicating the interior of the embedded pipe with the external atmosphere and comprises a drainage side and a ventilation side; the pressure difference unit is used for forming pressure difference between the inside of the embedded pipe and the outside atmosphere so as to enable air inside and outside the embedded pipe to circularly flow, and is connected with the ventilation side of the communication unit; the monitoring unit is used for monitoring temperature and humidity in the embedded pipe in real time; and the control unit receives signals of the monitoring unit and controls the differential pressure unit and the communication unit to work. A double-circulation dehumidification system is formed through cooperation of all the units, and dehumidification of a multi-phase coupling field in the embedded pipe structure can be achieved; the dehumidification part is not limited to the interior of the sling and the surface of a steel wire, and can go deep into the lower part of a beam to dehumidify accumulated water and wet air in the embedded pipe.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge engineering, and more specifically, relates to a drainage and dehumidification system and method for stay cables and suspension cables embedded pipes based on differential pressure double circulation. Background Art

[0002] Stay cables and suspension cables are key force-transferring components of cable-supported bridges. They transfer loads such as vehicle loads, wind loads, and self-weights from the bridge deck to the main load-bearing structures of the bridge (such as bridge towers, main cables, or anchorages). Their service performance is crucial for the safety of the entire bridge. If the stay cables or suspension cables are damaged or fail, it may lead to the instability or even collapse of the bridge structure.

[0003] However, the change of environmental temperature and the high-frequency vibration of the bridge deck will cause the cured foaming agent to crack and seep water, and at the same time, the anti-corrosion grease will also melt and leak. In addition, there are tiny gaps between the suspension cables and the waterproof covers, and rainwater enters the embedded pipes through the gaps and adsorbs in the foam inside the pipes, resulting in the long-term soaking of the anti-corrosion grease by water and being prone to emulsification, deterioration, and failure. Under the combined action of these factors, there may be a phenomenon of water accumulation in the embedded pipes. The steel wires and anchor fittings are in a humid environment for a long time and are prone to corrosion, thus posing a huge safety risk to the entire bridge.

[0004] Currently, the common dehumidification method is to use a ventilation device to introduce dry air into the stay cables. After the dry air absorbs water vapor on the surface of the steel wires, it becomes moist air and is then discharged out of the cable body through the air outlet pipe. In this way, the humidity on the surface of the steel wires is reduced, and the stay cable body remains dry continuously, thereby preventing the corrosion of the stay cable steel wires by corrosive substances such as water vapor and oxygen. However, this dehumidification scheme of dry air mainly targets the moist air inside the suspension cables and on the surface of the steel wires, and it cannot achieve an ideal dehumidification effect for the phenomenon of water accumulation in the embedded pipes. Summary of the Invention

[0005] The purpose of the present invention is to address the above deficiencies and provide a drainage and dehumidification system and method for stay cables and suspension cables embedded pipes based on differential pressure double circulation, which solves the technical problem of difficult drainage and dehumidification of stay cables and suspension cables embedded pipes.

[0006] To achieve the above object, the present invention is realized through the following technical solutions: In a first aspect, the present invention provides a drainage and dehumidification system for stay cables and suspension cables embedded pipes based on differential pressure double circulation, including: A sealing unit for sealing the embedded pipe to form a closed space inside; A communication unit for communicating the inside of the embedded pipe with the external atmosphere, including a drainage side and a ventilation side; A differential pressure unit for forming a differential pressure between the inside of the embedded pipe and the external atmosphere to enable the air inside and outside the embedded pipe to circulate, which is connected to the ventilation side of the communication unit; A monitoring unit for real-time monitoring of temperature and humidity inside the embedded pipe; A control unit that receives the signals from the monitoring unit and controls the operation of the differential pressure unit and the connection unit.

[0007] Furthermore, the sealing unit is arranged inside the orifice of the embedded pipe and includes foaming agent and anti-corrosion grease.

[0008] Furthermore, the connection unit includes an extension sleeve, a ventilation pipe, and a drain pipe; the extension sleeve is arranged at the upper orifice of the embedded pipe and connects the embedded pipe and the protective cover; the ventilation pipe is arranged on the ventilation side, one end of the ventilation pipe extends into the air inside the embedded pipe, and the other end is connected to an electric control valve; the drain pipe is arranged on the drainage side, one end of the drain pipe extends below the accumulated water level inside the embedded pipe, and the other end is connected to an electric control valve.

[0009] Furthermore, the extension sleeve is provided with straight-through joints on both the ventilation side and the drainage side. The ventilation pipe is connected to the electric control valve through the straight-through joint on the ventilation side, and the drain pipe is connected to the electric control valve through the straight-through joint on the drainage side. The straight-through joint can be an external thread straight-through joint.

[0010] In the above solution, by using the extension sleeve and the straight-through joint, it is not necessary to directly drill additional holes on the embedded pipe to set pipes and sensors, which can ensure the sealing performance of the ventilation pipe and the drain pipe with the connection unit, and at the same time facilitate the replacement of the external air supply pipe and the drainage pipe.

[0011] Furthermore, the ventilation pipe is a flexible pipe, and the drain pipe is a metal rigid pipe.

[0012] Furthermore, the differential pressure unit includes a fan and an air duct, one end of the air duct is connected to the fan, and the other end is connected to the electric control valve on the ventilation side of the connection unit.

[0013] Furthermore, the monitoring unit includes a temperature and humidity sensor, and the temperature and humidity sensor is connected to the drainage side of the connection unit.

[0014] Furthermore, the temperature and humidity sensor is connected to the acquisition box through an acquisition cable, the acquisition box is connected to the main tower power supply box through a power supply cable, and the acquisition box is connected to the control unit. The connection of other cables can refer to the prior art and will not be elaborated in this invention.

[0015] In the second aspect, the present invention provides a method for draining and dehumidifying the embedded pipe of the pulling and suspending cable based on differential pressure double cycle. Based on the drainage and dehumidification system described in the first aspect, it includes: Real-time acquisition of the temperature and humidity inside the embedded pipe; When the collected temperature and humidity are greater than the set values, the connection unit and the pressure difference unit are turned on. The pressure difference unit inputs the dry air from the outside into the embedded pipe through the ventilation side of the connection unit until the input dry air creates a pressure difference between the inside and outside of the embedded pipe, and the accumulated water in the embedded pipe is discharged through the drainage side of the pressure difference unit to complete the first cycle. After the accumulated water in the embedded pipe is completely drained, the pressure difference unit continues to work to input the dry air from the outside into the embedded pipe, and discharges the wet air and the residual moisture from the first cycle through the drainage side of the pressure difference unit until the duration reaches the set working duration and the collected temperature and humidity are lower than the set values, completing the second cycle, and turning off the connection unit and the pressure difference unit.

[0016] Further, the pressure difference unit inputs the dry air from the outside into the embedded pipe through the ventilation side of the connection unit, including: the fan of the pressure difference unit dries the drawn air and then inputs it into the embedded pipe through the electric control valve and the ventilation pipe. The accumulated water, wet air and the residual moisture from the first cycle in the embedded pipe are all discharged through the drain pipe and the electric control valve.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: The embedded pipe drainage and dehumidification system and method provided by the present invention utilize the synergistic effect of the sealing unit, the connection unit, the pressure difference unit, the monitoring unit and the control unit to form a double-cycle dehumidification system, which can realize the dehumidification of the multi-phase coupling field inside the embedded pipe structure; the dehumidification part is not limited to the inside of the sling and the surface of the steel wire, and can penetrate deep into the part under the beam to dehumidify the accumulated water and wet air inside the embedded pipe. The core of the drainage and dehumidification system of the present invention consists of a pressure difference unit, a structural part and the outside atmosphere. Taking the system composed of equipment, structure and the outside atmosphere as the operation scenario of the dehumidification system is the basic premise of the double-cycle dehumidification system. The drainage and dehumidification method of the present invention aims at the double-cycle dehumidification system of the multi-phase coupling field inside the structure. By continuously inputting dry gas through a high-pressure fan, the accumulated water inside the structure is discharged, and the moisture in the internal air and the liquid attached to the inner wall of the structure and the inner wall of the connecting pipe are further dried by the method of secondary circulation in the system to ensure the dehumidification effect of the whole system. Brief Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of a drainage and dehumidification system for a suspended cable embedded pipe based on a pressure difference double cycle provided by an embodiment of the present invention; Figure 2 It is a schematic diagram of the connection relationship model between the connection unit and the embedded pipe described in the embodiment; Figure 3 It is a layout diagram of the device and cables described in the embodiment; Figure 4Logic control diagram of a drainage and dehumidification method for embedded pipes of pulling and hoisting cables based on differential pressure double cycle provided by an embodiment of the present invention; Figure 5 Application site of the drainage and dehumidification system of the present invention Figure 1 ; Figure 6 Application site of the drainage and dehumidification system of the present invention Figure 2 .

[0019] In the figure: 1. Sealing unit; 2. Connecting unit; 21. Extension sleeve; 22. External thread straight-through joint; 23. Electric control valve; 24. Ventilation pipe; 25. Drain pipe; 26. Sealing glue; 3. Differential pressure unit; 31. High-pressure blower; 32. Metal air duct; 4. Monitoring unit; 41. Temperature and humidity sensor; 42. Acquisition box; 43. Main tower power supply box; 44. Acquisition cable; 45. Power supply cable; 5. Embedded pipe; 6. Protective cover; 7. Pulling and hoisting cable. Specific embodiments

[0020] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings and specific embodiments.

[0021] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0022] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0023] Example 1: As Figure 1As shown in the figure, this embodiment provides a drainage and dehumidification system for the embedded pipe of the hoisting cable based on differential pressure double circulation, which includes a sealing unit 1, a connecting unit 2, a differential pressure unit 3, a monitoring unit 4, and a control unit (not shown in the figure).

[0024] In this embodiment, the sealing unit 1 is composed of foaming agent and anticorrosive grease, and is located at the pipe orifice of the embedded pipe.

[0025] In this embodiment, the connecting unit 2 serves as the main channel for gas circulation, connecting the differential pressure unit 3, the monitoring unit 4, and the external atmosphere to form a dehumidification differential pressure circulation system, which plays an important role in transporting dry gas, adjusting the internal and external air pressures, and maintaining the stability of the system.

[0026] In this embodiment, as Figure 1 and Figure 2 shown, the connecting unit 2 includes an extension sleeve 21, a ventilation pipe 24, and a drain pipe 25; the extension sleeve 21 is fixed at the upper pipe orifice of the embedded pipe 5, and connects the embedded pipe 5 and the protective cover 6 through bolts, and the interface is sealed with sealant 26; the connecting unit 2 is divided into a drainage side and a ventilation side according to its function, and the extension sleeves 21 on both the ventilation side and the drainage side are provided with external thread straight-through joints 22; the ventilation pipe 24 is arranged on the ventilation side, one end of the ventilation pipe 24 extends into the air inside the embedded pipe 5, and the other end is connected to the electric control valve 23 through the external thread straight-through joint 22; the drain pipe 25 is arranged on the drainage side, one end of the drain pipe 25 extends below the accumulated water level inside the embedded pipe 5, and the other end is connected to the electric control valve 23 through the external thread straight-through joint 22; by using the extension sleeve 21 and the external thread straight-through joint 22, there is no need to directly drill additional holes on the embedded pipe 5 to set pipes and sensors, which can ensure the sealing performance of the ventilation pipe 24 and the drain pipe 25 with the connecting unit 2, and at the same time facilitate the replacement of the external air supply pipe and the drainage pipe; the electric control valve 23 is used to prevent the reverse intrusion of water vapor; the ventilation pipe 24 is a flexible pipe, and the drain pipe 25 is a metal hard pipe.

[0027] In this embodiment, the differential pressure unit 3 includes a high-pressure fan 31 and a metal air duct 32. One end of the metal air duct 32 is connected to the high-pressure fan 31 ( Figure 6 is the high-pressure fan connected on-site), and the other end is connected to the electric control valve 23 on the ventilation side of the connecting unit 2.

[0028] In this embodiment, as Figure 3As shown, the monitoring unit 4 includes a temperature and humidity sensor 41, a collection cable 44, a power supply cable 45, a collection box 42 and a main tower power supply box 43; the temperature and humidity sensor 41 is arranged on the drainage side and is used to judge the humidity condition inside the embedded pipe 5; the temperature and humidity sensor 41 is connected to the collection box 42 through the collection cable 44 and is connected to the main tower power supply box 43 through the power supply cable 45, and the collection box 42 is connected to the control unit; the power supply cable 45 is also connected to other components that need to be powered, such as the high-pressure blower 31. The above line connections are common lines in the prior art and will not be elaborated in the present invention.

[0029] In this embodiment, the control unit is used to receive the signal of the monitoring unit 4 and control the differential pressure unit 3 and the communication unit 2 to work; the control unit adopts a local and remote dual-mode control architecture to achieve hierarchical management. Remote control is convenient for dehumidification regulation of all the bridge's lifting cables, ensuring the overall coordination of the system operation; local control provides precise management for the dehumidification maintenance of a specific cable area. The corresponding controller devices and their connection control relationships can all adopt the prior art and will not be elaborated in the present invention.

[0030] The installation process of the lifting cable embedded pipe drainage and dehumidification system based on differential pressure double circulation provided in this embodiment is as follows: (1) Open the lifting cable protective cover 6 and remove the originally filled foaming agent and anti-corrosion grease.

[0031] (2) Install the communication unit 2. Install an extension sleeve 21 at the upper end pipe orifice of the embedded pipe 5. The extension sleeve 21 is connected to the embedded pipe 5 and the protective cover 6 by bolts, and the interface is sealed with a sealant 26. The communication unit 2 plays an important role in connecting each unit to make them work together and jointly form a dehumidification circulation system.

[0032] (3) Connect a lengthened metal pipe (drain pipe 25) inside the extension sleeve 21 on the drainage side of the communication unit 2 and extend it below the accumulated water level inside the embedded pipe 25, and communicate with the atmosphere outside; connect the differential pressure unit 3 outside the extension sleeve 21 on the ventilation side and connect a flexible pipe (ventilation pipe 24) inside; install the monitoring unit 4 on the extension sleeve 21 on the drainage side to monitor the humidity inside the embedded pipe. The application site after installation is as Figure 5 shown.

[0033] The ventilation pipe 24 and the drain pipe 25 connect the outside atmosphere and each unit. Under the action of the high-pressure blower 31, a pressure difference is formed between the space inside the pipe and the outside atmosphere, which is the main driving force for the operation of the dehumidification system. In addition, the ventilation pipe 24 and the drain pipe 25 are the main channels for the flow of gas and liquid, playing the role of gas transportation and drainage of accumulated water.

[0034] (4) Refill the foaming agent and anti-corrosion grease to form a sealing system and install the protective cover 6 of the lifting cable.

[0035] Fill the foaming agent and anti-corrosion grease to form a sealed space inside the embedded pipe 5, so as to ensure that a sufficient pressure difference can be formed inside and outside the embedded pipe 5 after the pressure difference unit 3 is started, providing sufficient power for the operation of the dehumidification and drainage system.

[0036] Embodiment 2: This embodiment provides a method for draining and dehumidifying the embedded pipe of the pulling and suspending cable using a pressure difference double cycle. Using the dehumidification and drainage system described in Embodiment 1, the control logic of the method is as Figure 4 shown, specifically including: (1) Start the monitoring unit 4 through the local control unit or the remote control unit; (2) When the temperature and humidity sensor 41 in the monitoring unit 4 detects that the temperature and humidity inside the embedded pipe 5 are greater than the set value, the electric control valve 23 of the connection unit 2 is opened, the high-pressure fan 31 is started, and the pressure difference unit 3 starts to operate. The high-pressure fan 31 has a built-in drying function. After drying the sucked air, it continuously inputs it into the connection unit 2 through the metal air duct 32, and then is transported to the inside of the embedded pipe 5 through the ventilation pipe 24 of the connection unit 2.

[0037] (3) The drain pipe 25 on the drainage side of the connection unit 2 connects the inside of the embedded pipe 5 with the outside atmosphere. With the continuous input of the dry gas, a pressure difference is formed inside and outside the embedded pipe 5, and the water inside the embedded pipe 5 is discharged through the drain pipe 25 connected to the outside, completing the first cycle of draining and dehumidifying the embedded pipe 5.

[0038] (4) After all the accumulated water in the embedded pipe 5 is drained, the pressure difference unit 3 still needs to continue operating and continuously input dry gas. The dry gas is introduced into the inside of the embedded pipe 5 through the ventilation pipe 24, absorbs the moisture in the air inside the embedded pipe 5 and the remaining moisture at the bottom of the embedded pipe 5, and then is discharged to the outside through the drain pipe 25, taking away the accumulated water attached to the inner wall of the drain pipe 25 due to the first cycle of drainage. Through the continuous input of the high-pressure fan 31, the dry gas continuously circulates in the system to take away the moisture until the duration of the dehumidification work reaches the set working duration and the value measured by the temperature and humidity sensor 41 is lower than the set value, then the pressure difference unit 3 stops working and the electric control valve 23 closes. Thus, the second cycle is completed and the dehumidification work ends.

[0039] The embodiments of the present invention have been described above. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Without departing from the scope and technical principles of the described embodiments, many modifications and changes are obvious to those of ordinary skill in the art in this technical field, and these modifications and changes should also be regarded as the protection scope of the present invention.

Claims

1. A drainage and dehumidification system for the embedded pipe of the pulling and suspending cable based on differential pressure double cycle, characterized in that, Comprising: A sealing unit for sealing the embedded pipe to form a sealed space inside; A connecting unit for connecting the inside of the embedded pipe with the outside atmosphere, including a drainage side and a ventilation side; A pressure difference unit for forming a pressure difference between the inside and the outside of the embedded pipe to enable the air inside and outside the embedded pipe to circulate, connected to the ventilation side of the connecting unit; A monitoring unit for real-time monitoring of the temperature and humidity inside the embedded pipe; A control unit for receiving the signal of the monitoring unit and controlling the operation of the pressure difference unit and the connecting unit.

2. The drainage and dehumidification system for the embedded pipe of the pulling and lifting cable based on the differential pressure double cycle according to claim 1, wherein The sealing unit is arranged inside the orifice of the embedded pipe and includes foaming agent and anti-corrosion grease.

3. The drainage and dehumidification system for the embedded pipe of the pulling and suspending cable based on the differential-pressure double cycle according to claim 1, wherein, The connecting unit includes an extension sleeve, a ventilation pipe and a drainage pipe; The extension sleeve is arranged at the upper orifice of the embedded pipe and connects the embedded pipe and the protective cover; the ventilation pipe is arranged on the ventilation side, one end of the ventilation pipe extends into the air inside the embedded pipe, and the other end is connected to an electric control valve; the drainage pipe is arranged on the drainage side, one end of the drainage pipe extends below the accumulated water level inside the embedded pipe, and the other end is connected to an electric control valve.

4. The dehumidifying and drainage system for embedded pipes of tension and suspension cables based on differential-pressure double cycle according to claim 3, wherein The extension sleeve is provided with straight-through joints on both the ventilation side and the drainage side, The ventilation pipe is communicated with the electric control valve through the straight-through joint on the ventilation side, and the drainage pipe is communicated with the electric control valve through the straight-through joint on the drainage side.

5. The drainage and dehumidification system for the embedded pipe of the pulling and hoisting cable based on the differential pressure double cycle according to claim 3, wherein, The ventilation pipe is a flexible pipe, and the drainage pipe is a metal hard pipe.

6. The drainage and dehumidification system for the embedded pipe of the pulling and hoisting cable based on the differential pressure double cycle according to claim 1, characterized in that, The pressure difference unit includes a fan and an air duct, one end of the air duct is connected to the fan, and the other end is connected to the electric control valve on the ventilation side of the connecting unit.

7. The drainage and dehumidification system for the embedded pipe of the lifting cable based on the differential pressure double cycle according to claim 1, characterized in that, The monitoring unit includes a temperature and humidity sensor, and the temperature and humidity sensor is connected to the drainage side of the connecting unit.

8. The drainage and dehumidification system for the embedded pipe of the pulling and hoisting cable based on the differential pressure double cycle according to claim 7, characterized in that, The temperature and humidity sensor is connected to the acquisition box through an acquisition cable, the acquisition box is connected to the main tower power supply box through a power supply cable, and the acquisition box is connected to the control unit.

9. A drainage and dehumidification method for the embedded pipe of the pulling and suspending cable based on differential pressure double cycle, based on the drainage and dehumidification system described in any one of claims 1 to 8, characterized in that, Comprising: Real-time collection of the temperature and humidity inside the embedded pipe; When the collected temperature and humidity are greater than the set value, the connecting unit and the pressure difference unit are turned on. The pressure difference unit inputs the dry air from the outside into the embedded pipe through the ventilation side of the connecting unit until the input dry air forms a pressure difference between the inside and the outside of the embedded pipe, and the accumulated water inside the embedded pipe is discharged through the drainage side of the pressure difference unit to complete the first cycle; After the accumulated water inside the embedded pipe is drained, the pressure difference unit continues to work to input the dry air from the outside into the embedded pipe, and discharges the wet air and the residual moisture of the first cycle through the drainage side of the pressure difference unit until the duration reaches the set working duration and the collected temperature and humidity are lower than the set value, completing the second cycle and turning off the connecting unit and the pressure difference unit.

10. The method for draining and dehumidifying the embedded pipe of the pulling and suspending cable with differential pressure double cycle according to claim 9, characterized in that, The pressure difference unit inputs the dry air from the outside into the embedded pipe through the ventilation side of the connecting unit, including: the fan of the pressure difference unit dries the drawn air and then inputs it into the embedded pipe through the electric control valve and the ventilation pipe; The accumulated water, wet air and residual moisture of the first cycle inside the embedded pipe are all discharged through the drainage pipe and the electric control valve.

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