Maintenance facilities and methods for precast beams used in sections of high-speed railways under existing railway lines

Abstract

This invention discloses a precast beam curing facility and method for precast beams passing under operating high-speed railway sections. Adjacent precast beams are joined to form an insulation cover, with waterproof strips installed between them for sealing. Multiple precast beams are combined into a curing shed. Each precast beam has a base and casters at its bottom, and curtains are installed at both ends. The curing shed contains curing equipment, including a water tank, a circulating water pump, an outlet pipe, and a reversing valve. One end of the prestressed duct in the precast beam has an inlet pipe, and the other end has a drain pipe. The four ports of the reversing valve are connected to the circulating water pump, outlet pipe, inlet pipe, and drain pipe, respectively. The circulating water pump and outlet pipe are connected to the water tank. This invention addresses the problems of micro-cracks appearing inside the precast beam during the cooling period due to insufficient curing, and poor surface performance of the precast beam due to insufficient temperature distribution during the constant temperature period.

Description

Technical Field

[0001] This invention relates to the technical field of precast beam maintenance, specifically to a combined precast beam maintenance facility and method for precast beams used in sections of high-speed railways that are underway. Background Technology

[0002] Precast beams are common in bridge engineering, often used in the construction of long-span bridges. This project, which passes under an operating high-speed railway, employs a pile-beam structure for safety reasons. After fabrication in the precast yard, the precast beams require curing. Weather and climate are significant factors affecting construction progress and quality. Low winter temperatures slow or even halt concrete strength development, severely impacting the quality of the precast beam concrete. Traditional curing methods involve erecting fixed curing sheds around the precast beams after pouring the concrete. This approach is costly and slows down construction. Open-air curing exposes the concrete surface to environmental factors; in hot weather, direct sunlight causes rapid evaporation of surface moisture, while low winter temperatures prevent proper spray curing, further affecting the quality of the precast beams.

[0003] The current precast beam curing process is divided into four stages: static curing, heating up, constant temperature, and cooling down. The constant temperature and cooling down stages are crucial for the early strength development of concrete. However, uneven temperature distribution during curing can be extremely detrimental to the curing of precast beam concrete. Furthermore, the curing methods, especially the early curing stages, and the control of curing temperature, humidity, and time all significantly impact the degree of hydration and hardening, strength development, and durability of the concrete, particularly affecting the surface layer. Therefore, it can be concluded that the curing temperature and humidity of precast beams directly affect their quality. The cooling down stage also requires attention; failure to promptly cool the precast beam during this period can lead to internal micro-cracks, which will inevitably affect the performance of the precast beam. Existing cooling methods generally involve surface spraying, such as CN112049446A and CN113289781A. However, the interior of precast beams cannot be effectively cooled, which is why microcracks appear inside. Summary of the Invention

[0004] This invention addresses the following problems: either the inability to ensure proper curing during the cooling period, leading to micro-cracks inside the precast beam, or the inability to achieve uniform temperature distribution during the constant temperature period, resulting in poor surface performance of the precast beam. Therefore, this invention proposes a combined precast beam curing facility and method for precast beams used in sections of high-speed railways under operation.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] The maintenance facilities for precast composite beams passing under the operating high-speed railway section include composite insulation unit panels, moving wheels, curtains, and waterproof strips;

[0007] Two adjacent combined insulation unit panels are spliced ​​together to form an insulation cover, and a waterproof strip is installed between two adjacent combined insulation unit panels for sealed installation. Multiple combined insulation unit panels form a combined curing shed. The bottom of the combined insulation unit panels is equipped with a base and a moving wheel, and the combined insulation unit panels at both ends are equipped with door curtains.

[0008] The modular curing shed is equipped with curing equipment, including a water tank, a circulating water pump, an outlet pipe, and a reversing valve. One end of the prestressed pipe in the precast beam is connected to an inlet pipe, and the other end is connected to a drain pipe. The four ports of the reversing valve are connected to the circulating water pump, the outlet pipe, the inlet pipe, and the drain pipe, respectively. The circulating water pump and the outlet pipe are connected to the water tank.

[0009] Preferably, the end of the prestressed duct is equipped with a pressing plate installed at the end of the precast beam, and an air bladder located inside the prestressed duct. The air bladder has a through channel, and a connecting rod is installed in the through channel. A pressure plate is provided on the side of the air bladder near the inside of the prestressed duct. The pressure plate is connected to the pressing plate through the connecting rod, and the length of the connecting rod can be adjusted to seal the air bladder to the end of the prestressed duct. A water pipe interface is installed in the middle of the pressing plate.

[0010] Preferably, cooling equipment is installed on the water inlet pipe and the water outlet pipe. The cooling equipment includes a compressor, a condenser, and an evaporator. The compressor is provided with a high-temperature and high-pressure outlet and a low-temperature and low-pressure inlet. The high-temperature and high-pressure outlet is connected to the inlet of the condenser. The outlet of the condenser is connected to the inlet of the evaporator through an expansion valve and a copper pipe. The outlet of the evaporator is connected to the low-temperature and low-pressure inlet through a copper pipe. The evaporator is suitable for cooling the water passing through the water inlet pipe and the water outlet pipe.

[0011] Preferably, the water inlet pipe and the drainage pipe include a main pipe and a secondary pipe located inside the main pipe. The drainage outlet of the main pipe is located near the end of the prestressed pipe, and the drainage outlet of the secondary pipe is located at 3 / 5 to 2 / 3 of the depth of the prestressed pipe.

[0012] Preferably, the combined insulation unit board is equipped with a tongue and groove joint and a plug-in structure adapted to the tongue and groove joint, and the plug-in structure and the tongue and groove joint are fixedly installed by a connecting component.

[0013] Preferably, the connecting assembly includes two opposing clamping bodies. The two clamping bodies first clamp the plug-in structure and then move inward together with the plug-in structure, causing the retractable structure to compress the waterproof strip.

[0014] Preferably, the retractable structure includes a connector with a retractable part at one end and a connector installed on the inner wall of the tongue and groove at the other end. After the connector is connected to the retractable part, the tongue and groove and the plug-in structure, it is suitable for pulling the tongue and groove and the plug-in structure together.

[0015] Preferably, the connecting assembly includes bolts suitable for penetrating tongue and groove and mating structures.

[0016] Preferably, the maintenance equipment further includes a constant temperature maintenance component, which includes a steam boiler, a water tank, a steam-to-water converter, a temperature and humidity detection wireless transmitter, steam and water jets, steam and water delivery pipes, a heating and cooling device, and a temperature and humidity sensor.

[0017] A steam-to-water converter is connected to one side of the water tank. The steam-to-water converter has a built-in wireless module that receives control commands from the control unit to control the amount of steam or water.

[0018] The steam and water flow converter is connected to the steam boiler and water tank respectively, ensuring that both steam and water spraying maintenance can be carried out.

[0019] The steam and water flow converter and steam and water delivery pipeline are connected to deliver the steam or water required for curing to the steam and water jets in various parts of the modular curing shed, and then spray them out to perform curing operations on the precast beams.

[0020] Steam and water jets are installed in the modular curing shed, inside the precast beams, and on the side wing plates of the precast beams, with one jet installed every 5 meters.

[0021] Temperature and humidity sensors are installed on the left and right side panels inside the modular maintenance shed, with a pair installed every 5 meters.

[0022] The temperature and humidity sensor is connected to the temperature and humidity detection wireless transmission device;

[0023] The temperature and humidity detection wireless transmission device has a built-in temperature and humidity controller, control unit, and wireless control unit;

[0024] The wireless temperature and humidity detection and transmission device can not only transmit precast beam curing data to the staff, but also control the heating and cooling devices and the opening and closing of steam and water jets.

[0025] Heating and cooling devices are suitable for controlling the temperature and humidity inside modular curing sheds.

[0026] The maintenance method and steps for precast beams in composite precast beam maintenance facilities passing under operating high-speed railway sections are as follows:

[0027] S1: After the modular insulation unit panels are assembled on the concrete ground according to the precast beams, the door curtain, waterproof strip, casters and internal support frame are installed and combined into a modular curing shed to stabilize the whole.

[0028] S2: An intelligent temperature and humidity control system is formed by installing a temperature and humidity detection wireless transmission device, steam and water jet heads, steam and water delivery pipes, heating and cooling devices, and temperature and humidity sensors inside the modular curing shed.

[0029] During constant temperature curing:

[0030] S3: The temperature and humidity sensor receives the temperature and humidity data inside the combined maintenance shed and transmits it to the temperature and humidity detection wireless transmission device via a data cable.

[0031] S4: The temperature and humidity detection wireless transmitter is equipped with a microprocessor, a data acquisition module, a data processing module, a control module, a wireless module, and a power management module. The temperature and humidity sensor communicates with the temperature and humidity detection wireless transmitter. The acquired data is processed by the ADC signal filtering and amplification before being transmitted to the control module.

[0032] S5: After receiving the information, the internal control module of the temperature and humidity detection wireless transmitter sends the instructions to the water vapor and water flow converter and the heating and cooling device through the wireless transmitter to control the spraying of water vapor and water in the combined curing shed. The opening and closing of the heating and cooling device plays a role in controlling the temperature and humidity in the combined curing shed.

[0033] S6: First, input the temperature and humidity index required for the curing of the precast beam into the control unit. When the data transmitted back by the temperature and humidity sensor is processed by the temperature and humidity detection wireless transmission device and the data obtained is the same as the previously set temperature and humidity index, the steam and water spray head and the heating and cooling device will stop working.

[0034] S7: When the data transmitted back by the temperature and humidity sensor is processed by the temperature and humidity detection wireless transmission device and the obtained data is different from the previously set temperature and humidity index, the steam and water jet head and the heating and cooling device will continue to work.

[0035] S8: Repeat the above steps to maintain the required temperature and humidity inside the modular curing shed, ensuring the quality of the precast beam's constant-temperature curing.

[0036] During maintenance in the cooling period:

[0037] S9: Temperature sensors are pre-embedded at the internal design points during the casting of precast beams. When the temperature detected by the pre-embedded temperature sensor exceeds the temperature detected by the temperature and humidity sensor by 15°C, the circulating water pump starts to supply water to the prestressed pipe. At the same time, the compressor drives the evaporator to work to cool the supplied water. The water discharged from the drain pipe will be cooled again through another set of evaporators and returned to the water tank through the outlet pipe. The inlet and outlet pipes switch the inlet and outlet states under the action of the reversing valve. The switching occurs every 40 to 60 seconds. When the inlet and outlet switch, the water inside the main pipe and the prestressed pipe will have a large-area convection. The auxiliary pipe will first enter the prestressed pipe at 3 / 5 to 2 / 3 of the position to initially cool the cooling water at that position. After the water supply resistance of the main pipe is sharply reduced, the main pipe will then cool the prestressed pipe.

[0038] S10: Repeat the above steps to maintain the required temperature and humidity inside the modular curing shed, ensuring the quality of curing during the cooling period of the precast beams.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] The prestressed pipes inside the precast beam are cooled by a circulating water pump and a reversing valve. The reversing valve switches the direction of water inflow and outflow repeatedly, ensuring uniform cooling. Simultaneously, cooling equipment cools both the inflow and outflow water, achieving the desired cooling effect with a small amount of water. The system switches every 40-60 seconds. During this switching, large-scale convection occurs between the main pipe and the prestressed pipe. The secondary pipe first enters the prestressed pipe at 3 / 5 to 2 / 3 of its length for initial cooling. Then, as the water supply resistance of the main pipe decreases sharply, the main pipe then cools the prestressed pipe. This ensures that the water temperature in the main pipe at the inflow end remains low after the switching, effectively improving the cooling effect. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0042] Figure 2 This is a schematic diagram of the overall structure of the tongue and groove and the plug-in structure in one embodiment of the present invention.

[0043] Figure 3 This is a schematic diagram of the overall structure of the tongue and groove and plug-in structure in another embodiment of the present invention.

[0044] Figure 4 This is a partial enlarged view of the clamping member clamping the plug-in structure in one embodiment of the present invention.

[0045] Figure 5This is a partial enlarged view of the clamping member before clamping the insertion structure in one embodiment of the present invention.

[0046] Figure 6 This is a partial enlarged view of the pull-and-plug structure of the retractable member in one embodiment of the present invention.

[0047] Figure 7 This is a partial enlarged view of the pull-out structure in one embodiment of the present invention.

[0048] Figure 8 This is a structural layout diagram of the constant temperature period of the maintenance equipment in one embodiment of the present invention.

[0049] Figure 9 This is a structural layout diagram of the constant temperature period inside the curing shed in one embodiment of the present invention.

[0050] Figure 10 This is a structural layout diagram of the cooling period of the maintenance equipment in one embodiment of the present invention.

[0051] Figure 11 for Figure 10 Schematic diagram of the connection structure between the medium-pressure connector and the airbag. Detailed Implementation

[0052] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0053] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0054] Example 1, as Figure 1 , Figure 2 , Figure 10 As shown, the precast composite beam maintenance facility for the section of high-speed railway under the line of operation includes a composite insulation unit panel 10, a moving wheel 20, a curtain 30, and a waterproof strip 40.

[0055] Two adjacent combined insulation unit panels 10 are spliced ​​together to form an insulation cover and a waterproof strip 40 is installed between two adjacent combined insulation unit panels 10 for sealed installation. Multiple combined insulation unit panels 10 form a combined curing shed. A base and a moving wheel 20 are installed at the bottom of the combined insulation unit panel 10. A door curtain 30 is installed on the combined insulation unit panel 10 located at both ends.

[0056] The modular curing shed is equipped with curing equipment, including a No. 1 water tank 50, a circulating water pump 60, an outlet pipe 70, and a reversing valve 80. One end of the prestressed pipe in the precast beam is equipped with an inlet pipe 90, and the other end is equipped with a drain pipe 100. The four ports of the reversing valve 80 are respectively connected to the circulating water pump 60, the outlet pipe 70, the inlet pipe 90, and the drain pipe 100. The circulating water pump 60 and the outlet pipe 70 are connected to the No. 1 water tank 50.

[0057] like Figure 11 As shown, a pressure plate 110, which is installed at the end of the prestressed duct and is attached to the end of the precast beam, and an air bladder 120 located inside the prestressed duct are also present. A through-channel 130 is provided on the air bladder 120, and a connecting rod 140 is installed within the through-channel 130. A pressure plate is located on the side of the air bladder 120 closest to the inside of the prestressed duct. The pressure plate is connected to the pressure plate 110 via the connecting rod 140. The length of the connecting rod 140 is adjusted to seal the air bladder 120 at the end of the prestressed duct. A water pipe interface 150 is installed in the middle of the pressure plate 110. Adjusting the bolts on the connecting rod 140 reduces the distance between the pressure plate 110 and the pressure plate, thereby inflating the air bladder 120 and sealing it at the end of the prestressed duct. The water pipe interface 150 is connected to the inlet pipe 90 and the drain pipe 100.

[0058] like Figure 10 As shown, cooling equipment is installed on the water inlet pipe 90 and the drain pipe 100. The cooling equipment includes a compressor 160, a condenser 170, and an evaporator 180. The compressor 160 is provided with a high-temperature and high-pressure outlet 190 and a low-temperature and low-pressure inlet 200. The high-temperature and high-pressure outlet 190 is connected to the inlet of the condenser 170. The outlet of the condenser 170 is connected to the inlet of the evaporator 180 through an expansion valve 210 and a copper pipe. The outlet of the evaporator 180 is connected to the low-temperature and low-pressure inlet 200 through a copper pipe. The evaporator 180 is suitable for cooling the water passing through the water inlet pipe 90 and the drain pipe 100. The compressor 160 is fully loaded with refrigerant. After the refrigerant is compressed by the compressor 160, it is discharged from the high-temperature and high-pressure outlet 190 and enters the condenser 170 for initial cooling. The cold source of the condenser 170 comes from the water flowing inside the water tank. The water is then injected under high pressure through the expansion valve 210 to form millimeter- or micron-sized refrigerant beads, which enter the evaporator 180 and cool the water flowing through it. The refrigerant inside the evaporator 180 enters the low-temperature and low-pressure port 200 and is compressed again by the compressor. This cycle repeats to complete the cooling of the water source at the water supply end.

[0059] like Figure 10 and Figure 11As shown, the water inlet pipe 90 and the drainage pipe 100 include a main pipe 220 and a secondary pipe 230 located inside the main pipe 220. The drainage outlet of the main pipe 220 is located near the end of the prestressed pipe, and the drainage outlet of the secondary pipe 230 is located at 3 / 5 to 2 / 3 of the depth of the prestressed pipe.

[0060] Temperature sensors are pre-embedded at designed locations within the precast beam during internal casting. When the temperature detected by the pre-embedded temperature sensor exceeds the temperature detected by the temperature and humidity sensor 350 by 15°C, the circulating water pump 60 starts to supply water to the prestressed pipes. Simultaneously, the compressor drives the evaporator 180 to cool the supplied water. The water discharged from the drain pipe 100 is cooled again by another set of evaporators 180 and returns to the first water tank 50 via the outlet pipe 70. The inlet pipe 90 and the drain pipe 100 are connected by a reversing valve. Under the action of 80, the water inlet and outlet states are switched every 40 to 60 seconds. When the water inlet and outlet are switched, a large area of ​​convection occurs inside the main pipe and the prestressed pipe. The auxiliary pipe will first enter the prestressed pipe at 3 / 5 to 2 / 3 of its length to initially cool the cooling water at that point. After the water supply resistance of the main pipe is sharply reduced, the main pipe will then cool the prestressed pipe. This process is repeated to maintain the required temperature and humidity inside the combined curing shed, ensuring the quality of curing during the cooling period of the precast beam.

[0061] like Figure 2 As shown, in one embodiment, the connecting assembly includes bolts adapted to pass through the tongue and groove joint 240 and the plug structure 250.

[0062] like Figures 3 to 7 As shown, another implementation: The modular insulation unit panel 10 is equipped with a tongue and groove joint 240 and a plug-in structure 250 adapted to the tongue and groove joint 240. The plug-in structure 250 and the tongue and groove joint 240 are fixedly installed by a connecting component. The connecting component includes two clamping bodies 260 arranged opposite to each other. The two clamping bodies 260 will first clamp the plug-in structure 250 and then move inward together with the plug-in structure 250, causing the pull-out structure to compress the waterproof strip 40. The pull-out structure includes a connector 270 with pull-out parts at both ends. After the connector 270 is connected to the pull-out part, the tongue and groove joint 240 and the plug-in structure 250, it is suitable for pulling the tongue and groove joint 240 and the plug-in structure 250 to each other.

[0063] like Figure 4 , Figure 5As shown, guide groove 1 and guide groove 2 are installed inside tongue and groove 240. Pins are installed within guide groove 1 and guide groove 2, and these pins are used to install clamping body 260. A tension spring is installed between clamping body 260 and tongue and groove 240, and the tension spring is always in a stretched state. Guide groove 1 has an arc-shaped guide section. The arc-shaped guide section, with a radius equal to the shortest distance between guide groove 1 and guide groove 2, is suitable for clamping the clamping body. The main bodies of guide groove 1 and guide groove 2 are in a parallel state, suitable for conveying after clamping. Figure 6 and Figure 7 As shown, the two ends of the connector 270 are flexible unidirectional connectors. When separating in the opposite direction, a large force is required to pull the flexible unidirectional connector in the opposite direction to deform it through the connecting groove on the plug-in structure 250. After the flexible unidirectional connector enters the connecting groove, the main body of the connector 270 is continuously pressured by the continuously entering plug-in structure 250, which changes the main body from a stable linear state to a stable waist-shaped structure state.

[0064] Implementation status of replanting: such as Figure 8 , Figure 9 As shown, the maintenance equipment also includes a constant-temperature maintenance component, which includes a steam boiler 280, a second water tank 290, a steam-to-water flow converter 300, a temperature and humidity detection wireless transmitter 310, a steam and water spray nozzle 320, a steam and water delivery pipeline 330, a heating and cooling device 340, and a temperature and humidity sensor 350. The steam-to-water flow converter 300 is connected to one side of the second water tank 290. The steam-to-water flow converter 300 has a built-in wireless module that receives control commands from the control unit to control the amount of steam or water. The steam-to-water flow converter 300 is connected to both the steam boiler 280 and the first water tank 50 to ensure that both steam and water spraying maintenance are possible. The steam-to-water flow converter 300 is connected to the steam and water delivery pipeline 330 to supply the water required for maintenance. Steam or water is delivered to steam and water jets 320 throughout the modular curing shed and sprayed out to cure the precast beams. The steam and water jets 320 are installed in the modular curing shed, inside the precast beams, and on the side wing plates of the precast beams, spaced 5 meters apart. Temperature and humidity sensors 350 are installed on the left and right side plates inside the modular curing shed, with a pair spaced 5 meters apart. The temperature and humidity sensors 350 are connected to a temperature and humidity detection wireless transmitter 310. The temperature and humidity detection wireless transmitter 310 has a built-in temperature and humidity controller, control unit, and wireless control unit. The temperature and humidity detection wireless transmitter 310 not only transmits precast beam curing data to workers but also controls the heating and cooling device 340 and the steam and water jets 320 to turn on and off. The heating and cooling device 340 is suitable for controlling the temperature and humidity inside the modular curing shed.

[0065] The maintenance method and steps for precast beams in composite precast beam maintenance facilities passing under operating high-speed railway sections are as follows:

[0066] S1: After the modular insulation unit panel 10 is assembled on the concrete ground according to the precast beam, the door curtain 30, waterproof strip 40, moving wheel 20 and inner support frame 360 ​​are installed and combined into a modular curing shed to stabilize the whole.

[0067] S2: After installing a temperature and humidity detection wireless transmission device 310, a steam and water jet head 320, a steam and water delivery pipe 330, a heating and cooling device 340, and a temperature and humidity sensor 350 in the modular maintenance shed, an intelligent temperature and humidity control system is formed.

[0068] During constant temperature curing:

[0069] S3: Temperature and humidity sensor 350 receives temperature and humidity data from the combined curing shed and transmits it to temperature and humidity detection wireless transmitter 310 via data cable.

[0070] S4: The temperature and humidity detection wireless transmitter 310 is internally equipped with a microprocessor, a data acquisition module, a data processing module, a control module, a wireless module, and a power management module; the temperature and humidity sensor 350 is internally connected and communicates with the temperature and humidity detection wireless transmitter 310, and the acquired data is processed and transmitted to the control module after being filtered and amplified by the ADC signal.

[0071] S5: After receiving the information, the internal control module of the temperature and humidity detection wireless transmitter 310 sends the instructions to the water vapor and water flow converter 300 and the heating and cooling device 340 through the wireless transmitter to control the spraying of water vapor and water in the combined curing shed. The opening and closing of the heating and cooling device 340 plays a role in controlling the temperature and humidity in the combined curing shed.

[0072] S6: First, input the temperature and humidity index required for the curing of the precast beam into the control unit. When the data transmitted back by the temperature and humidity sensor 350 is processed by the temperature and humidity detection wireless transmission device 310 and the data obtained is the same as the previously set temperature and humidity index, the steam and water spray head 320 and the heating and cooling device 340 will stop working.

[0073] S7: When the data transmitted back by the temperature and humidity sensor 350 is processed by the temperature and humidity detection wireless transmitter 310 and the data obtained is different from the previously set temperature and humidity index, the steam and water jet head 320 and the heating and cooling device 340 will continue to work.

[0074] S8: Repeat the above steps to maintain the required temperature and humidity inside the modular curing shed, ensuring the quality of the precast beam's constant-temperature curing.

[0075] During maintenance in the cooling period:

[0076] S9: Temperature sensors are pre-embedded at the internal design points during the casting of precast beams. When the temperature detected by the pre-embedded temperature sensor exceeds the temperature detected by the temperature and humidity sensor 350 by 15°C, the circulating water pump 60 starts to supply water to the prestressed pipe. At the same time, the compressor 160 drives the evaporator 180 to work to cool the supplied water. The water discharged from the drain pipe 100 will be cooled again by another set of evaporators 180 and returned to the No. 1 water tank 50 by the outlet pipe 70. The inlet pipe 90 and the outlet pipe 100 switch the inlet and outlet states under the action of the reversing valve 80. They switch every 40s to 60s. When the inlet and outlet water switch, the water inside the main pipe and the prestressed pipe will have a large area of ​​convection. The auxiliary pipe will first enter the prestressed pipe at the 3 / 5 to 2 / 3 position to cool the cooling water at that position. After the water supply resistance of the main pipe is sharply reduced, the main pipe will then cool the prestressed pipe.

[0077] S10: Repeat the above steps to maintain the required temperature and humidity inside the modular curing shed, ensuring the quality of curing during the cooling period of the precast beams.

[0078] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. The substitutions may be replacements of some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made to the technical solutions and inventive concepts of the present invention should all be covered within the scope of protection of the present invention.

Claims

1. A precast composite beam curing facility for tunneling under an operating high-speed railway section, characterized in that: Includes modular insulation unit panels (10), casters (20), door curtain (30), and waterproof strip (40); Two adjacent combined insulation unit panels (10) are spliced ​​together to form an insulation cover and a waterproof strip (40) is installed between two adjacent combined insulation unit panels (10) for sealed installation. Multiple combined insulation unit panels (10) form a combined curing shed. The bottom of the combined insulation unit panel (10) is equipped with a base and a moving wheel (20). The combined insulation unit panels (10) at both ends are equipped with door curtains (30). The modular curing shed is equipped with curing equipment, including a No. 1 water tank (50), a circulating water pump (60), an outlet pipe (70), and a reversing valve (80). One end of the prestressed pipe in the precast beam is equipped with an inlet pipe (90), and the other end is equipped with a drain pipe (100). The four ports of the reversing valve (80) are connected to the circulating water pump (60), the outlet pipe (70), the inlet pipe (90), and the drain pipe (100), respectively. The circulating water pump (60) and the outlet pipe (70) are connected to the No. 1 water tank (50). The water inlet pipe (90) and the drainage pipe (100) include a main pipe (220) and a secondary pipe (230) located inside the main pipe (220). The drainage outlet of the main pipe (220) is located near the end of the prestressed pipe, and the drainage outlet of the secondary pipe (230) is located at 3 / 5 to 2 / 3 of the depth of the prestressed pipe.

2. The precast composite beam maintenance facility for underpasses of operating high-speed railway sections according to claim 1, characterized in that, The end of the prestressed duct is equipped with a pressing plate (110) installed at the end of the precast beam, and an air bladder (120) located inside the prestressed duct. A through channel (130) is provided on the air bladder (120), and a connecting rod (140) is installed in the through channel (130). A pressure plate is provided on the side of the air bladder (120) close to the inside of the prestressed duct. The pressure plate is connected to the pressing plate (110) through the connecting rod (140), and the length of the connecting rod (140) is adjusted to seal the air bladder (120) at the end of the prestressed duct. A water pipe interface (150) is installed in the middle of the pressing plate (110).

3. The precast composite beam maintenance facility for underpasses of operating high-speed railway sections according to claim 2, characterized in that, Cooling equipment is installed on the water inlet pipe (90) and the drain pipe (100). The cooling equipment includes a compressor (160), a condenser (170), and an evaporator (180). The compressor (160) is provided with a high-temperature and high-pressure outlet (190) and a low-temperature and low-pressure inlet (200). The high-temperature and high-pressure outlet (190) is connected to the inlet of the condenser (170). The outlet of the condenser (170) is connected to the inlet of the evaporator (180) through an expansion valve (210) and a copper pipe. The outlet of the evaporator (180) is connected to the low-temperature and low-pressure inlet (200) through a copper pipe. The evaporator (180) is suitable for cooling the water in the water inlet pipe (90) and the drain pipe (100).

4. The precast composite beam maintenance facility for underpasses of operating high-speed railway sections according to any one of claims 1 to 3, characterized in that, The combined insulation unit panel (10) is equipped with a tongue and groove joint (240) and a plug-in structure (250) adapted to the tongue and groove joint (240). The plug-in structure (250) and the tongue and groove joint (240) are fixedly installed by a connecting component.

5. The precast composite beam maintenance facility for underpasses of operating high-speed railway sections according to claim 4, characterized in that, The connecting assembly includes two opposing clamping bodies (260). The two clamping bodies (260) first clamp the plug-in structure (250) and then move inward together with the plug-in structure (250) to compress the waterproof strip (40) by the pull-out structure.

6. The precast composite beam maintenance facility for underpasses of operating high-speed railway sections according to claim 5, characterized in that, The retractable structure includes a connector (270) with a retractable part at one end and a connector (270) installed on the inner wall of the tongue and groove at the other end. After the connector (270) is connected to the retractable part, the tongue and groove (240) and the plug-in structure (250), it is suitable for pulling the tongue and groove (240) and the plug-in structure (250) together.

7. The precast composite beam maintenance facility for underpasses of operating high-speed railway sections according to claim 4, characterized in that, The connecting assembly includes bolts adapted to pass through the tongue and groove (240) and the plug structure (250).

8. The precast composite beam maintenance facility for underpasses of operating high-speed railway sections according to claim 7, characterized in that, The maintenance equipment also includes a constant temperature maintenance component, which includes a steam boiler (280), a second water tank (290), a steam-to-water converter (300), a temperature and humidity detection wireless transmitter (310), a steam and water jet head (320), a steam and water conveying pipeline (330), a heating and cooling device (340), and a temperature and humidity sensor (350). A steam-to-water converter (300) is connected to one side of the second water tank (290). The steam-to-water converter (300) has a built-in wireless module that receives control commands sent by the control unit to control the amount of steam or water. The steam and water flow converter (300) is connected to the steam boiler (280) and the No. 1 water tank (50) respectively, to ensure that steam and water spraying maintenance can be carried out; A steam and water flow converter (300) and a steam and water delivery pipe (330) are connected to deliver the steam or water required for curing to steam and water jets (320) in various parts of the modular curing shed, and spray them out to perform curing operations on the precast beams; Steam and water jets (320) are installed in the modular curing shed, inside the precast beam, and on the side wing of the precast beam, with one jet installed every 5 meters. Temperature and humidity sensors (350) are installed on the left and right side panels inside the modular maintenance shed, with a pair installed every 5 meters. The temperature and humidity sensor (350) is connected to the temperature and humidity detection wireless transmitter (310); The temperature and humidity detection wireless transmission device (310) has a built-in temperature and humidity controller, control unit, and wireless control unit; The temperature and humidity detection wireless transmission device (310) not only transmits precast beam curing data to the staff, but also controls the heating and cooling device (340) and steam and water jet head (320) to turn on and off; The heating and cooling device (340) is suitable for controlling the temperature and humidity inside the combined maintenance shed.

9. A method for curing precast beams passing under a combined precast beam curing facility in an operating high-speed railway section, characterized in that, The maintenance steps are as follows: S1: After the modular insulation unit panel (10) is assembled on the concrete ground according to the condition of the precast beam, the door curtain (30), waterproof strip (40), moving wheel (20) and inner support frame (360) are installed and combined into a modular curing shed. S2: After installing a temperature and humidity detection wireless transmitter (310), a steam and water jet head (320), a steam and water delivery pipe (330), a heating and cooling device (340), and a temperature and humidity sensor (350) in the modular maintenance shed, an intelligent temperature and humidity control system is formed. During constant temperature curing: S3: The temperature and humidity sensor (350) receives the temperature and humidity data in the combined maintenance shed and transmits it to the temperature and humidity detection wireless transmission device (310) via a data cable. S4: The temperature and humidity detection wireless transmitter (310) is internally equipped with a microprocessor, a data acquisition module, a data processing module, a control module, a wireless module, and a power management module; The temperature and humidity sensor (350) is internally connected to the temperature and humidity detection wireless transmitter (310). The collected data is processed by the ADC signal filtering and amplification before being transmitted to the control module. S5: After receiving the information, the internal control module of the temperature and humidity detection wireless transmitter (310) sends the instructions to the water vapor and water flow converter (300) and the heating and cooling device (340) through the wireless transmitter to control the spraying of water vapor and water in the combined curing shed. The opening and closing of the heating and cooling device (340) plays a role in controlling the temperature and humidity in the combined curing shed. S6: First, input the temperature and humidity index required for the curing of the precast beam into the control unit. When the data transmitted back by the temperature and humidity sensor (350) is processed by the temperature and humidity detection wireless transmission device (310) and the data obtained is the same as the previously set temperature and humidity index, the steam and water spray head (320) and the heating and cooling device (340) will stop working. S7: When the data transmitted back by the temperature and humidity sensor (350) is processed by the temperature and humidity detection wireless transmitter (310) and the data obtained is different from the previously set temperature and humidity index, the steam and water jet head (320) and the heating and cooling device (340) will continue to work. S8: Repeat the above steps to maintain the required temperature and humidity inside the modular curing shed, ensuring the quality of the precast beam's constant-temperature curing. During maintenance in the cooling period: S9: Temperature sensors are pre-embedded at the internal design points during the casting of precast beams. When the temperature detected by the pre-embedded temperature sensor exceeds the temperature detected by the temperature and humidity sensor (350) by 15°C, the circulating water pump (60) starts to supply water to the prestressed pipe. At the same time, the compressor (160) drives the evaporator (180) to work to cool the supplied water. The water discharged from the drain pipe (100) will be cooled again by another set of evaporators (180) and returned to the No. 1 water tank (50) by the outlet pipe (70). The inlet pipe (90) and the outlet pipe (100) switch the inlet and outlet states under the action of the reversing valve (80) every 40s to 60s. When the inlet and outlet are switched, the water inside the main pipe and the prestressed pipe will have a large area of ​​convection. The auxiliary pipe will first enter the prestressed pipe at 3 / 5 to 2 / 3 position to cool the cooling water at that position. After the water supply resistance of the main pipe is sharply reduced, the main pipe will then cool the prestressed pipe. S10: Repeat the above steps to maintain the required temperature and humidity inside the modular curing shed, ensuring the quality of curing during the cooling period of the precast beams.

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