A kind of suspended steam curing system for steel structure bridge deck and concrete curing method

Abstract

The application discloses a kind of for steel structure bridge deck suspension steam curing system and concrete curing method, comprising: heat preservation cover, which includes coating polyester fiber cloth layer;Suspension fixing device, which includes magnetic attraction device fixed at the outermost four corners of the heat preservation cover, and suspension ring is arranged at the side of magnetic attraction device box;Steam supply system, which includes steam delivery pipe laid on the heat preservation cover;Lifting device, which includes lifting ring buckle pre-welded on the bottom of steel structure bridge deck and lifting line group connected with the suspension ring through the lifting ring buckle;Control system, which includes electronic thermometer arranged in the heat preservation cover and central controller communicated with the electronic thermometer and steam supply system.The application improves the stability and reliability of curing effect, and is suitable for the complex profile of steel structure bridge bottom, realizes rapid installation and removal.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering construction technology, and in particular to a curing device and method for concrete deck construction of steel structure bridges, specifically a suspended high-temperature steam curing system and a concrete curing method. Background Technology

[0002] Steel structure bridges are widely used in modern transportation engineering. To reduce weight and ensure bridge deck performance, composite bridge deck structures made of steel and ultra-high performance concrete have become the mainstream solution. This type of concrete material requires rigorous high-temperature steam curing to achieve the desired performance. Currently, the curing method often involves erecting curing sheds above the bridge deck, while no effective measures are taken for the area beneath. This approach has significant drawbacks: due to the thin concrete layer and the rapid thermal conductivity of steel plates, the temperature difference between the upper and lower surfaces of the bridge deck is extreme, easily causing thermal shrinkage cracks in the concrete, severely affecting its performance and durability; simultaneously, steel structure bridges often span roads, rivers, and other terrain features, and the space beneath the bridge lacks reliable working platforms, posing significant safety risks to personnel working at height to install and dismantle equipment; furthermore, traditional curing relies heavily on manual experience, making it difficult to precisely control the rate of temperature rise and fall and the duration of temperature control, failing to meet the requirements of modern engineering for automated and precise construction. Therefore, there is an urgent need for a new type of curing technology and equipment that can balance construction safety, curing quality, and process automation. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a suspended high-temperature steam curing device and method. This invention aims to completely solve the safety risks associated with personnel working at heights during the curing process, avoid the quality hazard of concrete cracking caused by excessive temperature differences between the upper and lower parts of the bridge deck, and achieve precise automated control of the curing process, thereby improving the stability and reliability of the curing effect. It also adapts to the complex contours of steel structure bridge bottoms, enabling rapid installation and dismantling.

[0004] The technical solution adopted by this invention to solve this technical problem is: a suspended steam curing system for steel structure bridge decks, comprising: The thermal insulation covering layer includes a coated polyester fiber cloth layer; The suspension fixing device includes magnetic suction devices fixed at the four outermost corners of the thermal insulation covering layer, and suspension rings provided on the side of the magnetic suction device box. A steam supply system, comprising a steam delivery pipe laid on the insulation covering layer; The lifting device includes a lifting ring pre-welded to the bottom of the steel bridge deck and a lifting cable assembly that passes through the lifting ring and connects to the suspension ring. The control system includes an electronic thermometer disposed within the insulation covering layer and a central controller communicatively connected to the electronic thermometer and the steam supply system.

[0005] As a further aspect of the present invention, the inner surface of the thermal insulation covering layer is provided with a guide channel that converges towards the center, and a drain hole is provided in the center of the guide channel, and the drain hole is connected to a drain hose. The guide channel includes: a downwardly recessed channel formed by hot pressing a coated polyester fiber cloth layer and a plastic shaping groove fitted into the channel.

[0006] As a further aspect of the present invention, a support frame is provided at the bottom of the thermal insulation covering layer; The support frame consists of a central arc section and inclined sections on both sides. When the maintenance system is raised to the working position, the inclined sections on both sides provide support for the insulation covering layer, forming a slope that flows from both sides to the center. The two ends of the support frame are fixedly connected to the magnetic suction device, so that the support frame, the thermal insulation covering layer and the magnetic suction device form a rigid unit that can be hoisted and disassembled as a whole.

[0007] As a further aspect of the present invention, the magnetic attraction device includes: a box, a U-shaped magnetic core, a permanent magnet, and an electromagnetic coil; The permanent magnet is tightly fixed to the two magnetic pole planes at the open end of the U-shaped magnetic core through welding or bonding, thereby forming a low magnetic resistance path between them. The electromagnetic coil is wound on one arm of the U-shaped magnetic core or simultaneously on both arms. The open end of the U-shaped magnetic core forms the upward adsorption working surface of the magnetic attraction device. The U-shaped magnetic core, permanent magnet and electromagnetic coil are all housed inside the box. A window is opened at the top of the box to expose the upward adsorption working surface for direct adsorption of the steel structure bridge deck. When the electromagnetic coil is supplied with a current in the first direction, the control magnetic flux generated by it is opposite to the working magnetic flux of the permanent magnet in the U-shaped magnetic core, thereby weakening the net magnetic flux passing through the adsorption working surface and putting the electromagnet box in a state of weakened magnetic force. When the electromagnetic coil is de-energized, the working magnetic flux of the permanent magnet independently forms a closed magnetic circuit, causing the electromagnet box to generate a rated attraction force and achieve self-locking when the power is off. When it is necessary to release the adsorption, the electromagnetic coil is supplied with a second-direction current opposite to the first direction. The control magnetic flux generated by the coil is in the same direction as the working magnetic flux of the permanent magnet and they are superimposed on each other, causing the U-shaped magnetic core to become magnetically saturated, thereby generating a magnetic gap repulsion force and driving the electromagnet box to release.

[0008] As a further aspect of the present invention, the electronic thermometer comprises multiple temperature probes arranged in a distributed manner, each corresponding to a different area of ​​the steel structure bridge deck; the steam delivery pipe is a manifold with multiple independent branches, each branch being equipped with a solenoid valve controlled by the central controller.

[0009] As a further aspect of the present invention, the lifting device further includes a ground synchronization control system; The lifting line assembly includes several sets of independent steel cables respectively connected to each of the lifting rings, and a drive unit for winding and unwinding each set of independent steel cables. The drive unit is an electric winch or a hydraulic winch. The ground synchronization control system includes a main controller and sensors for monitoring the length or tension of each independent steel cable. The main controller is electrically connected to the control terminals of each drive unit and is configured to: receive feedback signals from the sensors, and by comparing the real-time parameters of each steel cable with preset values, issue acceleration commands to drive units with lagging actions or deceleration commands to drive units with leading actions, so that all the independent steel cables maintain synchronous movement during the lifting or lowering process.

[0010] As a further aspect of the present invention, flexible magnetic strips are provided on all four sides of the outermost edge of the thermal insulation covering layer. The flexible magnetic strip is encapsulated in the fabric jacket at the edge of the thermal insulation covering layer, and uses magnetic force to make the edge of the thermal insulation covering layer fit against the steel structure bridge deck.

[0011] The present invention also provides a method for concrete curing using a suspended steam curing system for steel structure bridge decks, comprising the following steps: S1: Ground assembly and connection: On the ground or bottom platform, assemble the insulation covering layer, support frame and each of the magnetic suction devices into a whole, and connect the lifting line group through the lifting ring pre-welded to the bottom of the steel structure bridge deck and then to the suspension ring on the magnetic suction device. S2: Overall lifting: The assembled maintenance system is lifted to the predetermined position at the bottom of the composite bridge deck using the lifting device and ground synchronous control system. S3: Magnetic fixation: A first-direction current is passed through the electromagnetic coil of the magnetic attraction device to weaken its magnetic force. After fine-tuning the system position, the current is cut off, so that the magnetic attraction device generates an attraction force under the action of the permanent magnet and is firmly attached to the steel structure bridge surface, realizing power-off self-locking. S4: Automatic Maintenance: Connect to the steam supply system, set the maintenance temperature curve on the central controller, and start the system; steam enters through the steam delivery pipe into the insulation covering layer, and distributed electronic thermometers monitor the temperature data in real time and feed it back to the central controller, which adjusts the opening of the solenoid valves of each branch to achieve precise temperature control in each zone; during this process, steam condensate is collected through the guide channel to the drain hole and discharged through the drain hose; S5: System recovery: After curing to the designed age, the lifting line group is re-tensioned, and a second directional current is passed through the electromagnetic coil of the magnetic attraction device to generate a magnetic gap repulsion force and detach it from the bridge surface. Then, the lifting device is controlled to synchronously and smoothly lower the entire curing system to the ground.

[0012] This invention offers at least the following beneficial effects: Through integrated and innovative design, it significantly improves construction safety, maintenance quality, and operational efficiency. The entire system employs ground assembly, overall lifting, and electromagnetic adsorption fixing, completely eliminating the need for workers to operate at heights and fundamentally removing the risk of safety accidents. The system creates a curing space, and combined with flexible magnetic strips at the edges and an insulation covering layer, effectively reduces heat loss, ensuring a uniform curing temperature across the bridge deck. Distributed temperature measurement and zoned steam control technologies, achieved through precise closed-loop regulation by a central controller, ensure that the entire bridge deck concrete is in a uniform and ideal temperature field, completely preventing thermal shrinkage cracks and guaranteeing the final performance of ultra-high-performance concrete. Furthermore, fully automated control saves labor costs, avoids human error, and meets the requirements of digital and refined engineering management. The system's overall structure is stable, wind-resistant, with smooth condensate drainage, and stable synchronous lifting, combining high reliability and ease of operation, comprehensively optimizing the curing process of steel structure bridge deck concrete.

[0013] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0014] Figure 1 This is a front view schematic diagram of an embodiment of the suspended steam curing system of the present invention; Figure 2 This is a top view schematic diagram of an embodiment of the suspended steam curing system of the present invention; Figure 3 This is a schematic diagram of the support frame according to an embodiment of the present invention.

[0015] Among them, 1-Ultra-high performance concrete bridge deck, 2-Insulation covering layer, 3-Magnetic suction device, 4-Steel cable, 5-Suspension ring, 6-Lifting ring buckle, 7-Concave ribbed bottom steel plate, 8-Magnetic suction strip, 9-Temperature probe, 10-Steam conveying pipe, 11-Solenoid valve, 12-Guide channel, 13-Drain hole, 14-Steam conveying device, 15-Reinforcing bar, 16-Plastic shaping groove. Detailed Implementation

[0016] The present invention will now be described in detail and completely with reference to the accompanying drawings. Those skilled in the art will be able to implement the present invention based on these descriptions. Before describing the present invention with reference to the accompanying drawings, it should be particularly noted that the technical solutions and features provided in various parts of the present invention, including the following description, can be combined with each other without conflict.

[0017] Furthermore, the embodiments of the present invention described below are generally only some, not all, of the embodiments of the present invention. Therefore, all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The specific implementation process is as follows: This application applies to a composite bridge deck, the upper part of which is an ultra-high performance concrete bridge deck 1 made of ultra-high performance concrete material, and the lower part is a steel structure bridge deck. The steel structure bridge deck is a structural steel material used for load-bearing structures, its main component is iron, and it contains small amounts of carbon, manganese and other elements to enhance strength. It has the property of being attracted by magnets. The maintenance system of this application is set at the bottom of the composite bridge deck. The steel structure bridge deck under the composite bridge deck can be a flat steel plate structure or a concave ribbed bottom steel plate 7.

[0019] like Figures 1-2 As shown, the present invention provides a suspended steam curing system for steel structure bridge decks, comprising: The thermal insulation covering layer 2 includes a wear-resistant, airtight coated polyester fiber cloth layer; The suspension fixing device includes magnetic suction devices 3 fixed at the four outermost corners of the thermal insulation covering layer 2, and suspension rings 5 ​​set on the side of the magnetic suction device 3 box. A steam supply system, comprising a steam delivery pipe 10 laid on the insulation covering layer 2; The lifting device includes a lifting ring 6 pre-welded to the bottom of the steel structure bridge deck and a lifting line assembly that passes through the lifting ring 6 and connects to the suspension ring 5. The control system includes an electronic thermometer disposed within the insulation covering layer 2 and a central controller that is communicatively connected to the electronic thermometer and the steam supply system.

[0020] This invention provides a novel implementation of a suspended steam curing system. The core of this system lies in constructing a curing space that can completely enclose the bridge deck from the bottom and achieve automatic control. In practice, a large insulating covering layer 2 made of coated polyester fiber cloth is first prepared. This material is lightweight, wear-resistant, and effectively prevents steam leakage. Special magnetic suction devices 3 are fixed at the four corners of the covering layer. These devices integrate a magnetic circuit system composed of permanent magnets and electromagnetic coils, allowing control over the presence and strength of the suction force by switching the power on and off. Suspension rings 5 ​​are provided on the sides of the magnetic suction devices 3 for connection. The installation process begins on the ground. Before the bridge deck concrete is poured, operators pre-weld sturdy lifting rings 6 to the four corners of the bottom of the steel bridge deck. The lifting steel cable 4 is then passed through these rings and lowered to the ground. Subsequently, all work is completed on the ground or a stable platform: the insulating covering layer 2 is unfolded, the suspension rings 5 ​​on the magnetic suction devices 3 are connected to the lifting steel cable 4, and the steam delivery pipe 10 and the electronic thermometer wiring are arranged along the covering layer and connected to the steam generator and central controller on the ground. Once all preparations are complete, the lifting device is activated, and the entire curing system is smoothly and vertically lifted to the bottom of the bridge deck via steel cable 4. After the system is in place, the operator energizes the electromagnetic coil of the magnetic attraction device 3. This weakens the magnetic force, facilitating fine-tuning of the covering layer's position. After accurate positioning, the power is cut off, and the permanent magnets inside the magnetic attraction device 3 immediately exert their effect, generating a strong magnetic force that firmly attaches the entire system to the steel bridge deck, achieving reliable power-off self-locking. At this point, the lifting steel cable 4 can be released, and the system is completely fixed by magnetic force. A suspended curing chamber is then formed between the insulation covering layer 2 and the bridge deck. After the system is started, steam enters the chamber through the steam delivery device 14 and steam delivery pipe 10. An electronic thermometer monitors the internal temperature in real time and transmits the data back to the central controller. The controller analyzes this data and automatically adjusts the steam supply, thereby precisely controlling the curing temperature curve and ensuring that the heating and cooling rates meet process requirements until curing is complete. After maintenance, the lifting cable 4 is tensioned again and a reverse current is applied to the magnetic suction device 3 to release it, thus safely lowering the entire system to the ground and completing the recovery.

[0021] In another embodiment, the inner surface of the thermal insulation covering layer 2 is provided with a guide groove 12 that converges towards the center, and a drain hole 13 is provided in the center of the guide groove 12, and the drain hole 13 is connected to a drain hose; wherein, the guide groove 12 includes: a downwardly recessed channel formed by hot pressing of a coated polyester fiber cloth layer and a plastic shaping groove 16 fitted into the channel.

[0022] In this embodiment, an active drainage system is integrated during the design and manufacturing stage of the insulation covering layer 2. During implementation, downward-recessed channels are created on the inner surface of the laid coated polyester fiber fabric layer using a hot-pressing process. To ensure that these flexible channels do not collapse or become blocked due to their own deformation or external pressure while suspended, a semi-rigid plastic shaping groove 16 is tightly embedded within the hot-pressed channels. This plastic groove maintains the cross-sectional shape of the channels and ensures unobstructed flow. A drain hole 13 is opened in the central area where the drainage channels 12 converge, and a drain hose is connected here to guide the water to a safe discharge point outside the system. When the system starts operating, the water formed by steam condensation flows downward along the inner wall of the covering layer and is effectively captured by the drainage channels 12. Due to the support of the plastic shaping groove 16, the water flows smoothly along a preset path to the central drain hole 13 and is continuously discharged through the drain hose. This allows for the collection and targeted discharge of condensate, ensuring the dryness of the inner surface of the covering layer and maintaining the cleanliness and temperature stability of the curing space.

[0023] In another embodiment, a support frame is provided at the bottom of the thermal insulation covering layer 2; like Figure 3 As shown, the support frame consists of a central arc section and two inclined sections on both sides. When the maintenance system is raised to the working position, the inclined sections on both sides provide support for the insulation covering layer 2, forming a slope that flows from both sides to the center. The central arc section and the inclined sections on both sides can be made of crisscrossing steel bars 15, or they can be a plate structure that matches the shape of the insulation covering layer 2 and its valley bottom.

[0024] The two ends of the support frame are fixedly connected to the magnetic suction device 3, so that the support frame, the thermal insulation covering layer 2 and the magnetic suction device 3 form a rigid unit that can be hoisted and disassembled as a whole.

[0025] In this embodiment, the support frame is not a simple rod, but a rigid structure with a specific spatial shape. When the system is raised to the working position, the support frame firmly supports the soft insulation covering layer 2, forcibly shaping it into a stable double-sloped roof shape that gradually slopes down from the two edges to the center. This ensures that the drainage channel 12 is always on an effective drainage slope, allowing condensate to flow unimpeded to the center for collection.

[0026] The two ends of the support frame are directly and firmly connected to the magnetic suction devices 3 located at the four corners of the covering layer, combining the magnetic suction devices 3, the covering layer, and the support frame into a unified spatial unit with sufficient rigidity. This rigid unit can be quickly and neatly assembled as a whole on the ground, and will not fall apart during lifting and installation, greatly simplifying the operation. When subjected to wind loads, the support frame effectively distributes the load, suppresses the swaying of the covering layer, and greatly improves the wind resistance stability and durability of the system. Ultimately, it ensures the reliable operation of the drainage system and gives the entire suspended maintenance device a robust integrity and ease of operation.

[0027] In another embodiment, the magnetic attraction device 3 includes: a housing, a U-shaped magnetic core, a permanent magnet, and an electromagnetic coil; The permanent magnet is tightly fixed to the two magnetic pole planes at the open end of the U-shaped magnetic core through welding or bonding, thereby forming a low magnetic resistance path between them. The electromagnetic coil is wound on one arm of the U-shaped magnetic core or simultaneously on both arms. The open end of the U-shaped magnetic core forms the upward adsorption working surface of the magnetic attraction device 3. The U-shaped magnetic core, permanent magnet and electromagnetic coil are all housed inside the box. A window is opened at the top of the box to expose the upward adsorption working surface for direct adsorption of the steel structure bridge deck. When a current in the first direction is applied to the electromagnetic coil, the control magnetic flux it generates is opposite in direction to the working magnetic flux of the permanent magnet within the U-shaped magnetic core. This weakens the net magnetic flux passing through the adsorption working surface, placing the electromagnet box in a weakened magnetic state. After the system is lifted into position, it is in this state, facilitating manual fine-tuning of its position. At this time, the magnetic attraction device 3 will not suddenly pull it up. The system weight is borne by the lifting cable assembly, and the magnetic attraction device 3 is in a standby state.

[0028] When the electromagnetic coil is de-energized, the working magnetic flux of the permanent magnet independently forms a closed magnetic circuit, causing the electromagnet box to generate a rated attraction force, thus achieving self-locking when the power is off. During normal maintenance, once the system is fixed, it remains in a de-energized state, ensuring safety and energy saving. Even if a power outage occurs, the system will never fall, achieving inherent safety.

[0029] When it is necessary to release the adsorption, a second-direction current, opposite to the first direction, is passed through the electromagnetic coil. The resulting control magnetic flux is in the same direction as the working magnetic flux of the permanent magnet and they are superimposed, causing the U-shaped magnetic core to become magnetically saturated. This generates a magnetic gap repulsion force, driving the electromagnet box to release. This is used after maintenance, where the lifting line is first tensioned, and then a release command (passing the second-direction current) is sent, allowing the system to be safely lowered.

[0030] In this embodiment, during the adsorption fixation process, a current in a specific direction is first passed through the electromagnetic coil. The magnetic field generated by this current is opposite in direction to the inherent magnetic field of the permanent magnet, thus canceling each other out and greatly weakening the externally manifested magnetic force. At this time, the operator can safely fine-tune the position of the entire maintenance system without worrying that it will suddenly adhere. Once the position is precisely adjusted, the coil current is cut off, and the complete magnetic force of the permanent magnet is immediately restored. Through the magnetic circuit of the U-shaped iron core, it acts efficiently on the bridge deck steel plate, generating a strong adsorption force that firmly locks the system in place. Subsequently, even if the power is completely cut off during a maintenance cycle that lasts for several days, the adsorption force still exists, achieving intrinsic safety.

[0031] In another embodiment, the electronic thermometer consists of multiple temperature probes 9 arranged in a distributed manner, each corresponding to a different area of ​​the steel structure bridge deck; the steam delivery pipe 10 is a manifold with multiple independent branches, each branch equipped with a solenoid valve 11 controlled by the central controller. The steam delivery pipe 10 is fixed to the support frame by detachable pipe clamps (the support frame can be configured to extend beyond the insulation covering layer 2), so that the steam delivery pipe 10 maintains a stable spatial arrangement during system lifting and operation.

[0032] In this embodiment, during system operation, multiple distributed temperature probes 9 continuously transmit real-time temperature data of their respective areas to the central controller. The controller has pre-stored the required curing temperature curves. Instead of simply averaging the temperatures of all measuring points, it independently compares and calculates the data from each measuring point against the set value. When the system detects that the temperature in a certain area is lower than the set value, the central controller instructs the solenoid valve 11 on the corresponding steam branch to open appropriately, increasing the steam supply to that area to raise the temperature. Conversely, if the temperature in a certain area is too high, the solenoid valve 11 on the corresponding branch will close, reducing steam input. Through this closed-loop control logic of zoned sensing and independent regulation, the system can dynamically and automatically balance the temperature field of the entire curing space, ensuring that the concrete of every part of the bridge deck can complete curing in a nearly uniform, ideal temperature environment that meets the process requirements.

[0033] In another embodiment, the lifting device further includes a ground synchronization control system; The lifting line group includes several sets of independent steel cables 4 respectively connected to each of the lifting rings 6, and a drive unit for winding and unwinding each set of independent steel cables 4. The drive unit is an electric winch or a hydraulic winch. The ground synchronization control system includes a main controller and sensors for monitoring the length or tension of each of the independent steel cables 4. The main controller is electrically connected to the control terminal of each drive unit and is configured to: receive feedback signals from the sensors, and by comparing the real-time parameters of each steel cable 4 with preset values, issue acceleration commands to drive units with lagging actions or deceleration commands to drive units with leading actions, so that all the independent steel cables 4 maintain synchronous movement during the lifting or lowering process.

[0034] This implementation integrates an advanced ground-based synchronous control system into the lifting device. The system's hardware consists of several independent drive units, which can be electric winches or hydraulic winches. Each unit is responsible for retrieving and releasing an independent steel cable 4 connected to a specific lifting ring 6 on the bridge deck. The core of the system lies in the intelligent control layer, with a main controller acting as the command center. This controller continuously receives feedback signals from high-precision sensors installed on each steel cable 4 or drive unit, such as the actual retraction / release length of each steel cable 4 or its tension. The main controller continuously compares the real-time parameters of all steel cables 4 with preset values ​​generated based on an ideal, smooth lifting / lowering trajectory. If calculations detect that the retraction / release length of a particular steel cable 4 is slightly behind the others, or that its tension has abnormally increased, the main controller immediately sends a slight acceleration command via electrical connection to the drive unit controlling the lagging cable 4, causing it to briefly increase its speed to catch up. Conversely, if the movement of a particular steel cable 4 is ahead of the overall movement, the main controller instructs its corresponding drive unit to appropriately decelerate and wait. This is a continuous, dynamically fine-tuned closed-loop control process. In this way, the movement of all independent steel cables 4 is always forced to be in a highly synchronized state, thereby ensuring that the large and flexible maintenance system can maintain a horizontal, stable and controllable posture throughout the entire lifting process, just like a rigid platform. This effectively avoids any form of tilting, twisting and collision, ensuring the safety and reliability of the entire operation process.

[0035] In another embodiment, flexible magnetic strips 8 are provided on all four sides of the outermost edge of the thermal insulation covering layer 2; The flexible magnetic strip 8 is encapsulated within the fabric jacket at the edge of the thermal insulation covering layer 2, and uses magnetic force to make the edge portion of the thermal insulation covering layer 2 adhere to the steel structure bridge deck (e.g., Figure 1 The bottom of the U-rib shown is protruding.

[0036] In this embodiment, the magnetic strips 8 are encapsulated within a fabric jacket formed by sewing the edge material of the insulation covering layer 2, thus providing both protection and forming an integral whole with the covering layer. After the system is fixed in place by the main magnetic suction devices 3 at the four corners, these flexible magnetic strips 8 arranged on the four sides approach the bottom surface of the steel bridge, and due to magnetic attraction, they are attracted to the nearest steel surface. When encountering vertically protruding U-shaped stiffening ribs, they can conform to the surface of the web, which allows the insulation covering layer 2 and the bottom surface of the steel bridge to jointly enclose a curing space, significantly reducing steam leakage, ensuring a uniform and stable internal temperature field, and providing crucial environmental conditions for high-quality curing of concrete.

[0037] In another embodiment, a method for curing concrete using an overhead steam curing system for steel bridge decks includes the following steps: S1: Ground assembly and connection: On the ground or bottom platform, assemble the insulation covering layer 2, the support frame and each of the magnetic suction devices 3 into a whole, and connect the lifting line group through the lifting ring buckle 6 pre-welded to the bottom of the steel structure bridge deck to the suspension ring 5 on the magnetic suction device 3; wherein, during assembly, ensure that the flexible magnetic strip 8 at the edge of the insulation covering layer 2 is flat and unfolded. S2: Overall lifting: The assembled maintenance system is lifted to the predetermined position at the bottom of the composite bridge deck using the lifting device and ground synchronous control system. S3: Magnetic fixation: A first-direction current is passed through the electromagnetic coil of the magnetic attraction device 3 to weaken its magnetic force. After fine-tuning the system position, the current is cut off, so that the magnetic attraction device 3 generates an attraction force under the action of the permanent magnet and is firmly attached to the steel structure bridge surface, realizing power-off self-locking. During this process, the flexible magnetic strips 8 at the edge of the thermal insulation covering layer 2 are simultaneously attached to the steel structure bridge deck as the magnetic suction device 3 is fixed; then the tension of the lifting line group is released. S4: Automatic Maintenance: Connect to the steam supply system, set the maintenance temperature curve on the central controller, and start the system; steam enters through the steam delivery pipe 10 into the insulation covering layer 2, where distributed electronic thermometers monitor the temperature data in real time and feed it back to the central controller, which adjusts the opening of each branch solenoid valve 11 to achieve precise temperature control in each zone; during this process, steam condensate is collected through the guide channel 12 to the drain hole 13 and discharged through the drain hose; S5: System recovery: After curing to the designed age, the lifting line group is re-tensioned, and a second direction current is passed through the electromagnetic coil of the magnetic attraction device 3 to generate a magnetic gap repulsion force and detach it from the bridge surface. Then, the lifting device is controlled to synchronously and smoothly lower the entire curing system to the ground.

[0038] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and embodiments shown and described herein.

Claims

1. A suspended steam curing system for steel bridge decks, characterized in that, include: The thermal insulation covering layer includes a coated polyester fiber cloth layer; The suspension and fixing device includes electromagnetic suction devices fixed at the four outermost corners of the thermal insulation covering layer, and suspension rings set on the side of the electromagnetic suction device box. The electromagnetic suction devices are used to achieve adsorption and release on the bottom surface of the steel structure bridge deck. A steam supply system, comprising a steam delivery pipe laid on the insulation covering layer; The lifting device includes a lifting ring pre-welded to the bottom of the steel bridge deck and a lifting cable assembly that passes through the lifting ring and connects to the suspension ring. The control system includes an electronic thermometer disposed within the insulation covering layer and a central controller communicatively connected to the electronic thermometer and the steam supply system.

2. The suspended steam curing system for steel bridge decks as described in claim 1, characterized in that, The inner surface of the thermal insulation covering layer is provided with a guide channel that converges towards the center, and a drain hole is provided in the center of the guide channel, and the drain hole is connected to a drain hose. The guide channel includes: a downwardly recessed channel formed by hot pressing a coated polyester fiber cloth layer and a plastic shaping groove fitted into the channel.

3. The suspended steam curing system for steel bridge decks as described in claim 2, characterized in that, A support frame is provided at the bottom of the thermal insulation covering layer; The support frame consists of a central arc section and inclined sections on both sides. When the maintenance system is raised to the working position, the inclined sections on both sides provide support for the insulation covering layer, forming a slope that flows from both sides to the center. The two ends of the support frame are fixedly connected to the electromagnetic suction device, so that the support frame, the thermal insulation covering layer and the electromagnetic suction device form a rigid unit that can be hoisted and disassembled as a whole.

4. The suspended steam curing system for steel bridge decks as described in claim 3, characterized in that, The electromagnetic attraction device includes: a housing, a U-shaped magnetic core, a permanent magnet, and an electromagnetic coil; The permanent magnet is tightly fixed to the two magnetic pole planes at the open end of the U-shaped magnetic core through welding or bonding, thereby forming a low magnetic resistance path between them. The electromagnetic coil is wound on one arm of the U-shaped magnetic core or simultaneously on both arms. The open end of the U-shaped magnetic core forms the upward adsorption working surface of the electromagnetic attraction device. The U-shaped magnetic core, permanent magnet and electromagnetic coil are all housed inside the box. A window is opened at the top of the box to expose the upward adsorption working surface for direct adsorption of the steel structure bridge deck. When the electromagnetic coil is supplied with a current in the first direction, the control magnetic flux generated by it is opposite to the working magnetic flux of the permanent magnet in the U-shaped magnetic core, thereby weakening the net magnetic flux passing through the adsorption working surface and putting the electromagnetic adsorption device in a state of weakened magnetic force. When the electromagnetic coil is de-energized, the working magnetic flux of the permanent magnet independently forms a closed magnetic circuit, causing the electromagnetic attraction device to generate a rated attraction force and achieve self-locking when the power is off. When it is necessary to release the adsorption, the electromagnetic coil is supplied with a second direction current that is opposite to the first direction. The control magnetic flux generated by the coil is in the same direction as the working magnetic flux of the permanent magnet and they are superimposed on each other, causing the U-shaped magnetic core to become magnetically saturated, thereby generating a magnetic gap repulsion force and driving the electromagnetic adsorption device to release.

5. The suspended steam curing system for steel bridge decks as described in claim 4, characterized in that, The electronic thermometer consists of multiple temperature probes arranged in a distributed manner, each corresponding to a different area of ​​the steel structure bridge deck; the steam delivery pipe is a manifold with multiple independent branches, each branch equipped with a solenoid valve controlled by the central controller.

6. The suspended steam curing system for steel bridge decks as described in claim 5, characterized in that, The lifting device also includes a ground synchronization control system; The lifting line assembly includes several sets of independent steel cables respectively connected to each of the lifting rings, and a drive unit for winding and unwinding each set of independent steel cables. The drive unit is an electric winch or a hydraulic winch. The ground synchronization control system includes a main controller and sensors for monitoring the length or tension of each of the independent steel cables. The main controller is electrically connected to the control terminals of each drive unit and is configured to: receive feedback signals from the sensors, and by comparing the real-time parameters of each steel cable with preset values, issue acceleration commands to drive units with lagging actions or deceleration commands to drive units with leading actions, so that all the independent steel cables maintain synchronous movement during the lifting or lowering process.

7. The suspended steam curing system for steel bridge decks as described in claim 6, characterized in that, Flexible magnetic strips are provided on all four sides of the outermost edge of the thermal insulation covering layer; The flexible magnetic strip is encapsulated in the fabric jacket at the edge of the thermal insulation covering layer, and uses magnetic force to make the edge of the thermal insulation covering layer fit against the steel structure bridge deck.

8. The method for concrete curing using the suspended steam curing system for steel structure bridge decks as described in claim 7, characterized in that, Includes the following steps: S1: Ground assembly and connection: On the ground or bottom platform, assemble the insulation covering layer, support frame and each of the electromagnetic suction devices into a whole, and connect the lifting line group through the lifting ring pre-welded to the bottom of the steel structure bridge deck and then to the suspension ring on the electromagnetic suction device. S2: Overall lifting: The assembled maintenance system is lifted to the predetermined position at the bottom of the composite bridge deck using the lifting device and ground synchronous control system. S3: Magnetic attraction fixation: A first-direction current is passed through the electromagnetic coil of the electromagnetic attraction device to weaken its magnetic force. After fine-tuning the system position, the current is cut off, so that the electromagnetic attraction device generates an attraction force under the action of the permanent magnet and is firmly attracted to the steel structure bridge surface, realizing power-off self-locking. S4: Automatic Maintenance: Connect to the steam supply system, set the maintenance temperature curve on the central controller, and start the system; steam enters through the steam delivery pipe into the insulation covering layer, and distributed electronic thermometers monitor the temperature data in real time and feed it back to the central controller, which adjusts the opening of the solenoid valves of each branch to achieve precise temperature control in each zone; during this process, steam condensate is collected through the guide channel to the drain hole and discharged through the drain hose; S5: System recovery: After curing to the designed age, the lifting line group is re-tensioned, and a second directional current is passed through the electromagnetic coil of the electromagnetic suction device to generate a magnetic gap repulsion force and detach it from the bridge surface. Then, the lifting device is controlled to synchronously and smoothly lower the entire curing system to the ground.

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