CN-122013604-A - Full-time-efficiency refrigeration and drainage integrated system for plateau railway roadbed and control method thereof

CN122013604ACN 122013604 ACN122013604 ACN 122013604ACN-122013604-A

Abstract

The invention provides a full-time-efficiency refrigerating and draining integrated system for a plateau railway subgrade and a control method thereof, and belongs to the technical field of cold region railway engineering design and construction. The full-time-effect refrigerating and draining integrated system for the plateau railway roadbed and the control method thereof comprise an integrated roadbed structure body, an energy source and a control system for supplying energy to the integrated roadbed structure body and controlling the integrated roadbed structure body, the integrated roadbed structure body comprises modularized integrated skeleton units, wherein the integrated skeleton units are made of fiber reinforced polymers, a hollow truss structure is formed, and the integrated skeleton units are provided with vertical refrigeration pile components. According to the invention, the FRP skeleton unit integrating bearing, heat conduction and drainage is arranged, so that common functional conflict and construction interference of the traditional separate arrangement scheme are fundamentally avoided, and the efficient and directional migration of road base heat is realized and the refrigeration efficiency is remarkably improved by arranging the heat management paths of active refrigeration, skeleton heat conduction and remote heat dissipation.

Inventors

FENG TAO
ZHOU ZHIQIN
ZHANG KAIZHI
MIAO XUEYUN
DENG RUI
MI WEIJUN
LI YONGQIANG
HAN LONGWU
KONG LINGWEI
CHENG JIA
ZHANG FANG

Assignees

中铁二院工程集团有限责任公司
中铁西北科学研究院有限公司
中国中铁股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260324

Claims (10)

1. The full-time-effect refrigerating and draining integrated system for the plateau railway roadbed is characterized by comprising an integrated roadbed structure body and an energy source and control system for supplying energy to the integrated roadbed structure body and controlling the integrated roadbed structure body; The integrated roadbed structure comprises modularized integrated skeleton units (1), wherein the integrated skeleton units (1) are made of fiber reinforced polymers to form a hollow truss structure; The integrated skeleton unit (1) is provided with a vertical refrigeration pile component (21), an active refrigeration element is integrated in the vertical refrigeration pile component (21) to form a refrigeration pile (2), the cold end of the refrigeration pile (2) is in contact with soil, and the hot end of the refrigeration pile (2) is connected to the radiating fin array (4) through a horizontal component (22) of the integrated skeleton unit (1); Part of the horizontal component (22) of the integrated skeleton unit (1) is configured into a drainage channel (3), and a wall plate of the drainage channel (3) is provided with a slit water inlet hole (24) and finally converged into a main drain pipe (5); the energy and control system comprises a solar photovoltaic panel (6), an energy storage unit and a cooperative intelligent controller, wherein the cooperative intelligent controller is in communication connection with a temperature sensor, a moisture sensor and a flow sensor which are arranged in a roadbed, and is configured to execute various control strategies including conventional cooperation, drainage priority, defrosting dredging and energy saving modes.
2. The full-time-efficiency refrigerating and draining integrated system for the plateau railway roadbed according to claim 1 is characterized in that phase-change material layers are compounded in the pipe walls of the draining channel (3) and the main draining pipe (5), and the phase-change temperature point of the phase-change material is higher than the local frozen soil freezing temperature.
3. The integrated system for full-time-efficiency cooling and draining of a plateau railway bed of claim 1, wherein the collaborative intelligent controller pre-stores a first temperature threshold T 1 , a first water content threshold W 1 , a second temperature threshold T 2 , and a first flow threshold F 1 , the collaborative intelligent controller is configured to perform the following cycle control flow: S1, data acquisition, namely continuously acquiring temperature data T, water content data W, flow data F and temperature data T d of a drainage channel (3) of different depths of a roadbed; s2, mode judgment and execution: S21, judging a conventional cooperative mode, wherein if the system time is in a preset warm season date range, a trigger instruction controls all or part of the refrigeration piles (2) to run at rated power and keeps the drainage channel (3) smooth, and if the system time is in a preset cold season date range, the trigger instruction controls the refrigeration piles (2) to reduce the frequency to maintain the power or enter a standby state; S22, judging a drainage priority mode, namely after S21, if the water content data W of any monitoring point is judged to be more than W 1 , triggering a command to enhance the power of at least one refrigeration pile (2) near the monitoring point to enable the power to be raised to 110% -130% of rated power, continuously running for a first preset time t 1 , and then recovering to a command state of S21; S23, judging a defrosting and dredging mode, namely after S21, if judging that the temperature data T d ＜T 2 or the flow data F < F 1 of the drainage channel (3) are obtained, triggering a command to start a heat tracing function of the main drainage pipe (5), and temporarily and reversely operating active refrigerating elements in at least one adjacent refrigerating pile (2) to enable the active refrigerating elements to work in a heating mode, and after the second preset time T 2 is continued, closing heating and recovering heat tracing to a heat preservation state; The preset warm season and cold season date ranges are fixed start-stop dates set during system initialization based on historical meteorological data of an engineering place; The first preset time t 1 and the second preset time t 2 are fixed time parameters stored in the controller in advance; a drainage priority mode, namely when the water content sensor detects that the water content of a certain area is abnormally increased, enhancing the power of a refrigeration pile (2) near the area; And in the defrosting and dredging mode, when the drain channel (3) is judged to have freezing risk, the heat tracing function is started, and the active refrigerating elements in the adjacent refrigerating piles (2) are operated in a temporary reverse direction.
4. The full-time-efficiency refrigerating and draining integrated system of the plateau railway subgrade according to claim 3 is characterized in that the system is applied to a railway cut slope, a multifunctional anchoring pile is distributed at a key part of a potential collapse body of the railway cut slope, and the multifunctional anchoring pile is integrated with an active refrigerating element of a refrigerating pile (2) and an internal draining channel (3); The cooperative intelligent controller is also pre-stored with a rainfall forecast intensity threshold R 1 , and the controller is further configured to: receiving regional weather forecast information, and judging to enter a predictive slope fixing mode if the forecast rainfall intensity R > R 1 or the continuous high-temperature snow melting weather exists in a future preset time period; And in the predictive slope fixing mode, triggering an instruction to control the active refrigerating element of the multifunctional anchor pile in the cut slope region to operate at rated power until the predicted dangerous weather period is ended.
5. The integrated system for full-time-efficiency refrigeration and drainage of a plateau railway subgrade according to claim 4, which is applied to the transition section of a railway road bridge, and a refrigerating pile (2) group with gradient change of refrigerating power is arranged in the range of the subgrade behind the abutment, wherein the refrigerating pile (2) which is closer to the abutment has higher rated refrigerating power set value; the collaborative intelligent controller is further configured to: And when the conventional cooperative mode is operated, executing a gradient temperature control strategy according to the set power of the refrigerating piles (2) at different positions of the transition section.
6. The integrated system for full-time-effect refrigeration and drainage of the plateau railway subgrade according to claim 5, wherein the gradient temperature control strategy is to control the refrigeration piles (2) at different positions to operate at power values which are respectively set and change in gradient, so that the ground temperature field of the road bridge transition section forms a smooth transition temperature gradient.
7. The integrated system for full-time-efficiency refrigeration and drainage of a plateau railway roadbed according to claim 6, wherein the system is applied to a railway culvert, an automatic opening and closing grid mesh which is linked with a cooperative intelligent controller is arranged at an inlet of the railway culvert, and a phase change material temperature control layer and a distributed active refrigeration element are integrated at the side wall and an outlet area of the railway culvert; The collaborative intelligent controller is also pre-stored with a rainfall forecast threshold R 2 and a low-temperature threshold T 3 , and the controller is further configured to: Receiving weather forecast information, if the forecast rainfall intensity R > R 2 in a preset time period in the future, judging to enter a siltation prevention mode, triggering a command to open the grid mesh before a flood peak arrives, and closing the grid mesh after the flood peak arrives; If the system time is in a snow melting season and the predicted environmental temperature T < T 3 is simultaneously satisfied, the anti-icing plug mode is judged to be entered, and a trigger instruction starts a distributed active refrigeration element or a heat tracing function of the culvert outlet area until the environmental temperature rises to be more than T 3 .
8. The integrated system for full-time-efficiency refrigeration and drainage of a plateau railway bed as recited in claim 2, wherein the active refrigeration element is a thermoelectric refrigerator, and the phase change material is a nano aerogel thermal insulation material.
9. The control method for the full-time-efficiency refrigeration and drainage integration of the plateau railway roadbed is applied to the full-time-efficiency refrigeration and drainage integration system of the plateau railway roadbed as claimed in any one of the claims 3 to 8, and is characterized by being executed by the cooperative intelligent controller and comprising the following steps: Continuously collecting temperature, water and drainage flow data of the roadbed, and receiving external weather forecast information; the conventional cooperative control step comprises the steps of controlling the operation of the refrigeration pile (2) in a warm season and keeping the water drainage smooth according to the system date, and controlling the frequency reduction or standby of the refrigeration pile (2) in a cold season, wherein the warm season and the cold season are the preset fixed date ranges during the system initialization; On the basis of conventional synergy, if the local water content is monitored to exceed the limit, temporarily enhancing the power of the local refrigeration pile (2) to 110-130% of rated power, and continuing for a fixed time period t 1 ; And the defrosting and dredging control step, namely starting heat tracing and locally and gently heating for a fixed time period t 2 if the freezing risk of the drainage channel (3) is monitored on the basis of conventional cooperation.
10. The integrated control method for full-time-effect refrigeration and drainage of the plateau railway roadbed according to claim 9, wherein the gradient temperature control strategy is realized by setting different operation powers for the refrigeration piles (2) at different positions of the road bridge transition section.

Description

Full-time-efficiency refrigeration and drainage integrated system for plateau railway roadbed and control method thereof Technical Field The invention relates to the technical field of cold region railway engineering design and construction, in particular to a full-time-efficiency refrigerating and draining integrated system for a plateau railway subgrade and a control method thereof. Background In a plateau strong salinization frozen soil area, roadbed stability is maintained in effective control on thermal disturbance and water hazard, complex coupling effect is formed between the thermal disturbance and the water hazard through phase change characteristics of frozen soil, in current engineering practice, a refrigeration technology aiming at the thermal disturbance and a drainage technology aiming at the water hazard are often designed and implemented independently, the refrigeration technology depends on ground temperature regulation to reduce the thawing and sinking risk of the frozen soil, but the water content of a substrate soil body is possibly too high due to insufficient efficiency of a drainage system, the high phase change latent heat characteristic of water can consume cold greatly, the refrigeration efficiency is obviously reduced, the drainage technology is focused on draining the soil body to reduce the frost heaving thawing and sinking inducement, but if the effective ground temperature control is lacking, a drainage path is easy to be blocked due to freezing of peripheral frozen soil in a low temperature period, or sudden drainage requirements are generated due to thawing of the frozen soil in a warm season, so that the system is overloaded. More importantly, the separated design causes functional conflict and construction complexity to be aggravated, for example, the local low temperature during the operation of a hot rod can cause frost cracking of a drain pipe, the excavation of a drain structure can disturb the heat conduction path of the hot rod, the independent construction of two systems causes the interface joint to become a control blind area of heat flow and water flow, weak links in a freeze thawing cycle are extremely easy to form, and the rupture type treatment mode not only causes overall efficiency limitation, but also greatly increases maintenance cost in the whole life cycle of engineering. Disclosure of Invention In order to overcome the defects, the invention provides a full-time-effect refrigerating and draining integrated system for the plateau railway subgrade and a control method thereof, which overcome the technical problems or at least partially solve the problems. The invention is realized in the following way: The invention provides a full-time-effect refrigerating and draining integrated system of a plateau railway roadbed and a control method thereof, wherein the system comprises an integrated roadbed structure body and an energy source and control system for supplying energy to the integrated roadbed structure body and controlling the integrated roadbed structure body; The integrated roadbed structure body comprises modularized integrated skeleton units, wherein the integrated skeleton units are made of fiber reinforced polymers and form a hollow truss structure; The integrated skeleton unit is provided with a vertical refrigeration pile component, an active refrigeration element is integrated in the vertical refrigeration pile component to form a refrigeration pile, the cold end of the refrigeration pile is in contact with soil body, and the hot end of the refrigeration pile is connected to the radiating fin array through a horizontal component of the integrated skeleton unit; the part of the horizontal component of the integrated skeleton unit is constructed into a drainage channel, and a wall plate of the drainage channel is provided with a slit water inlet hole and finally converged to a main drain pipe; The energy and control system comprises a solar photovoltaic panel, an energy storage unit and a cooperative intelligent controller, wherein the cooperative intelligent controller is in communication connection with a temperature sensor, a moisture sensor and a flow sensor which are arranged in a roadbed, and is configured to execute various control strategies including conventional cooperation, drainage priority, defrosting dredging and energy saving modes. In a preferred scheme, phase change material layers are compounded in the pipe walls of the drainage channel and the main drainage pipe, and the phase change temperature point of the phase change material is higher than the local frozen soil freezing temperature. In a preferred embodiment, the intelligent controller is pre-stored with a first temperature threshold T 1, a first water content threshold W 1, a second temperature threshold T 2 and a first flow threshold F 1, and the intelligent controller is configured to execute the following loop control flow: S1, data acquisition, namely continuously ac