Fluid circulation system for uniform temperature control of a box girder
Patent Information
- Application Number
- CN202522627013.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-11
- Publication Date
- 2026-10-30
- Estimated Expiration
- 2035-12-11
AI Technical Summary
然而，传统的冷却水管系统通常采用均匀布管和统一管径的设计，未能充分考虑箱梁各部位（顶板、腹板、底板）因厚度和散热条件不同而导致的热量生成速率与散热需求的显著差异
[0020]本实用新型提供了一种用于箱梁均匀温度控制的流体循环系统，通过对循环流体管网络的差异化布设方式，使得第一管道和第二管道均部分布设于腹板内部，箱梁在水化热阶段或环境温度变化时需对内部进行均匀温度控制时，流经腹板的流体流量大于顶板和底板的流体流量，提高了对内部温升较高且持续时间较长的腹板的冷却效果，同时有效避免了顶板和底板的冷却过度，进而避免了因均匀布管冷却方式导致箱梁的开裂风险增加。第一管道内的流体由腹板流向顶板，第二管道内的流体由腹板流向底板，使得携带腹板热量的流体能够有效通过顶板和底板进行散热，符合箱梁各部位因厚度和散热条件不同而导致的散热需求的差异，进一步提高了箱梁内部温度场的均匀性。基于顶板散热能力强于底板的特点，将第一管道的直径设计为大于第二管道的直径，同等流体流速下，腹板内的热量能够更多地由顶板散出，从而平衡整个箱梁立面的温度场，有效抑制了温度裂缝的产生。控制模块能够接收来自温度监测模块的温度信号，并根据预设的温度目标值或温差限值对温控主机进行控制，调节循环流体管网络内流体的温度、流速和流量，以实现对箱梁内部温度进行动态精细调控。
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Figure CN224918312U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bridge engineering construction technology, and in particular to a fluid circulation system for uniform temperature control of box girders. Background Technology
[0002] Concrete segmental box girder structures face severe challenges in temperature cracking and deformation control during the hydration heat stage after construction and under varying ambient temperatures. The cement hydration reaction in concrete releases a significant amount of heat. Due to the large size of the box girder structure and the significant differences in thickness between the top, web, and bottom slabs, internal heat accumulates and dissipates unevenly, creating a nonlinear temperature field. Thicker sections of the web and bottom slab dissipate heat slowly, resulting in higher and prolonged internal temperature rises, while the thinner top slab cools down rapidly. This internal-external temperature difference and inter-section temperature difference generated by the hydration heat generates enormous tensile stress in the concrete. When this stress exceeds the tensile strength of the concrete, temperature cracks occur. Simultaneously, uneven temperature distribution can lead to harmful deformations such as upward or downward camber in the box girder, severely affecting the initial stress state, linear accuracy, and long-term durability of the structure.
[0003] Currently, traditional methods for controlling the heat of hydration in concrete often involve optimizing mix proportions, using low-heat cement, pre-embedded cooling water pipes, and covering with insulation materials. Among these, pre-embedded cooling water pipes are a commonly used and effective means of controlling the temperature rise of large-volume concrete due to its heat of hydration. However, traditional cooling water pipe systems typically employ uniform pipe distribution and a uniform pipe diameter design, failing to fully consider the significant differences in heat generation rates and heat dissipation requirements among different parts of the box girder (top slab, web slab, and bottom slab) due to variations in thickness and heat dissipation conditions. This uniform cooling approach can lead to mismatched cooling rates in different parts: thick-walled sections may not cool sufficiently, resulting in excessively high internal temperatures, while thin-walled sections may over-cool, creating excessive temperature gradients and increasing the risk of cracking. Furthermore, traditional pre-embedded cooling water pipe systems often lack the ability to dynamically and precisely control the cooling process based on real-time temperature data, resulting in poor matching between the cooling process and the actual thermodynamic state of the concrete, limited control effectiveness, and potentially even side effects.
[0004] Therefore, there is a great need for a temperature control system that can be designed differently for the characteristics of box girder structures and can achieve intelligent and precise regulation, so as to efficiently and evenly dissipate the heat of hydration and suppress temperature cracks and deformation from the source. Utility Model Content
[0005] The purpose of this invention is to provide a fluid circulation system for uniform temperature control of box girders, which is designed differently according to the structural characteristics of box girders to achieve intelligent and precise temperature regulation, efficiently and evenly dissipate the heat of hydration, and suppress temperature cracks and deformation of box girders from the source.
[0006] To achieve this objective, the present invention adopts the following technical solution:
[0007] A fluid circulation system for uniform temperature control of box girders, comprising:
[0008] A circulating fluid pipe network includes multiple independently arranged first pipes and multiple second pipes. The first pipes are arranged inside the web and top slab, and the multiple first pipes are distributed at intervals along the longitudinal direction of the box girder. The second pipes are arranged inside the web and bottom slab, and the multiple second pipes are distributed at intervals along the longitudinal direction of the box girder. The inlets of the multiple first pipes and multiple second pipes converge to form the total inlet of the circulating fluid pipe network, and the outlets of the multiple first pipes and multiple second pipes converge to form the total outlet of the circulating fluid pipe network. Both the first pipes and the second pipes are filled with fluid. The fluid in the first pipes flows from the web to the top slab, and the fluid in the second pipes flows from the web to the bottom slab. The diameter of the first pipes is larger than the diameter of the second pipes.
[0009] A temperature control unit, comprising an outlet and an inlet, wherein the outlet of the temperature control unit is connected to the total inlet of the circulating fluid pipe network, and the inlet of the temperature control unit is connected to the total outlet of the circulating fluid pipe network, and the temperature control unit is configured to regulate the temperature and pump the fluid within the circulating fluid pipe network.
[0010] A temperature monitoring module, configured to monitor the internal temperature of the box girder;
[0011] A control module is electrically connected to the temperature control host and the temperature monitoring module. The control module is configured to control the temperature control host to adjust the temperature, flow rate and flow rate of the fluid in the circulating fluid pipe network.
[0012] Optionally, the first pipe includes a first branch pipe and a second branch pipe. The first branch pipe extends vertically upward from the bottom of the web located to the left of the vertical center line of the box girder facade to the top plate, and extends horizontally to the right to the middle of the top plate. The inlet of the first branch pipe is located at the bottom of the web, and the outlet of the first branch pipe is located at the middle of the top plate. The second branch pipe and the first branch pipe are arranged symmetrically along the vertical center line of the box girder facade.
[0013] Optionally, the second pipe includes a third branch pipe and a fourth branch pipe. The third branch pipe extends vertically downward from the top of the web plate located to the left of the vertical center line of the box girder facade to the bottom plate, and extends horizontally to the right to the middle of the bottom plate. The inlet of the third branch pipe is located at the top of the web plate, and the outlet of the third branch pipe is located in the middle of the bottom plate. The fourth branch pipe and the third branch pipe are arranged symmetrically along the vertical center line of the box girder facade.
[0014] Optionally, when the first pipe and the second pipe of the circulating fluid pipe network are laid out in the same box girder facade, the longitudinal spacing between two adjacent box girder facades where the circulating fluid pipe network is laid out is 1m.
[0015] Optionally, when the first pipe and the second pipe of the circulating fluid pipe network are arranged in different box girder facades, the longitudinal distance between two adjacent box girder facades with the first pipe and the box girder facades with the second pipe is 0.8m.
[0016] Optionally, the temperature monitoring module includes multiple temperature sensors, which are evenly distributed inside the web, top plate, and bottom plate of the box girder, and each temperature sensor is electrically connected to the control module.
[0017] Optionally, the first pipe has a diameter of 60 mm and a wall thickness of 2 mm, and the second pipe has a diameter of 40 mm and a wall thickness of 2 mm.
[0018] Optionally, the fluid filled in the first pipe and the second pipe is water or antifreeze.
[0019] The beneficial effects of this utility model are:
[0020] This invention provides a fluid circulation system for uniform temperature control of box girders. By employing a differentiated layout of the circulating fluid pipe network, both the first and second pipes are partially located within the web. When uniform temperature control is required during the hydration heat stage or when ambient temperature changes, the fluid flow rate through the web is greater than that through the top and bottom plates. This improves the cooling effect on the web, where internal temperature rises are higher and lasts longer, while effectively preventing over-cooling of the top and bottom plates. This avoids an increased risk of cracking in the box girder caused by a uniform pipe cooling method. The fluid in the first pipe flows from the web to the top plate, and the fluid in the second pipe flows from the web to the bottom plate. This allows the fluid carrying heat from the web to effectively dissipate heat through the top and bottom plates, meeting the different heat dissipation requirements of various parts of the box girder due to variations in thickness and heat dissipation conditions, further improving the uniformity of the internal temperature field of the box girder. Based on the superior heat dissipation capacity of the top plate compared to the bottom plate, the diameter of the first pipe is designed to be larger than that of the second pipe. Under the same fluid flow rate, more heat from the web can be dissipated through the top plate, thus balancing the temperature field across the entire box girder facade and effectively suppressing the formation of temperature cracks. The control module receives temperature signals from the temperature monitoring module and controls the temperature control unit according to preset temperature target values or temperature difference limits, adjusting the temperature, flow rate, and volume of the fluid within the circulating fluid pipe network to achieve dynamic and precise control of the box girder's internal temperature. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the fluid circulation system for uniform temperature control of box girders as described in this embodiment of the invention, located on the elevation of the box girder. Figure 1 ;
[0022] Figure 2 This is a schematic diagram of the fluid circulation system for uniform temperature control of box girders as described in this embodiment of the invention, located on the elevation of the box girder. Figure 2 ;
[0023] Figure 3 This is a schematic diagram of the fluid circulation system for uniform temperature control of box girders as described in an embodiment of this utility model, at the longitudinal section of the box girder.
[0024] In the picture:
[0025] 1. First pipe; 11. First branch pipe; 12. Second branch pipe; 2. Second pipe; 21. Third branch pipe; 22. Fourth branch pipe; 3. Temperature sensor; 100. Web plate; 200. Top plate; 300. Bottom plate. Detailed Implementation
[0026] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.
[0027] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0028] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0029] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.
[0030] like Figures 1 to 3 As shown, this utility model provides a fluid circulation system for uniform temperature control of box girders, including a circulating fluid pipe network, a temperature control host, a temperature monitoring module, and a control module. The circulating fluid pipe network includes multiple independently arranged first pipes 1 and multiple second pipes 2. The first pipes 1 are located inside the web 100 and top plate 200, and are spaced apart along the longitudinal direction of the box girder. The second pipes 2 are located inside the web 100 and bottom plate 300, and are also spaced apart along the longitudinal direction of the box girder. The inlets of the multiple first pipes 1 and multiple second pipes 2 converge to form the total inlet of the circulating fluid pipe network, and the outlets of the multiple first pipes 1 and multiple second pipes 2 converge to form the total outlet of the circulating fluid pipe network. Both the first pipes 1 and the second pipes 2 are filled with fluid. The fluid in the first pipes 1 flows from the web 100 to the top plate 200, and the fluid in the second pipes 2 flows from the web 100 to the bottom plate 300. The diameter of the first pipes 1 is larger than the diameter of the second pipes 2. The temperature control unit includes an outlet and an inlet. The outlet of the temperature control unit is connected to the main inlet of the circulating fluid pipe network, and the inlet of the temperature control unit is connected to the main outlet of the circulating fluid pipe network. The temperature control unit is configured to regulate the temperature and pump the fluid within the circulating fluid pipe network. The temperature monitoring module is configured to monitor the internal temperature of the box girder. The control module is electrically connected to the temperature control unit and the temperature monitoring module. The control module is configured to control the temperature control unit to regulate the temperature, flow rate, and flow volume of the fluid within the circulating fluid pipe network.
[0031] The circulating fluid pipe network of the fluid circulation system used for uniform temperature control of the box girder, through the aforementioned differentiated layout, ensures that both the first pipe 1 and the second pipe 2 are partially located inside the web 100. When uniform temperature control is required during the hydration heat stage or when the ambient temperature changes, the fluid flow rate through the web 100 is greater than that through the top plate 200 and bottom plate 300. This improves the cooling effect on the web 100, where the internal temperature rise is higher and lasts longer, while effectively preventing over-cooling of the top plate 200 and bottom plate 300, thus avoiding an increased risk of cracking in the box girder due to the uniform pipe layout cooling method. Furthermore, the fluid in the first pipe 1 flows from the web 100 to the top plate 200, and the fluid in the second pipe 2 flows from the web 100 to the bottom plate 300. This allows the fluid carrying heat from the web 100 to effectively dissipate heat through the top plate 200 and bottom plate 300, meeting the different heat dissipation requirements of various parts of the box girder due to differences in thickness and heat dissipation conditions, further improving the uniformity of the internal temperature field of the box girder. Based on the superior heat dissipation capacity of the top plate 200 compared to the bottom plate 300, the diameter of the first pipe 1 is designed to be larger than that of the second pipe 2. Under the same fluid flow rate, more heat within the web 100 can be dissipated through the top plate 200, thus balancing the temperature field across the entire box girder facade and effectively suppressing the formation of temperature cracks. The control module receives temperature signals from the temperature monitoring module and controls the temperature control host according to preset temperature target values or temperature difference limits, adjusting the temperature, flow rate, and volume of the fluid within the circulating fluid pipe network to achieve dynamic and precise control of the internal temperature of the box girder.
[0032] Optionally, the fluids filling the first pipe 1 and the second pipe 2 are water or antifreeze. Using water as the fluid at normal temperatures is cost-effective and provides high heat exchange efficiency. Replacing it with antifreeze at low temperatures prevents pipe freezing and ensures stable system operation in frigid regions. This dual-fluid selection allows the fluid circulation system for uniform temperature control of box girders to be adapted to box girder construction in different regions or seasons, expanding the applicability of the technical solution and reducing temperature control costs under different operating conditions.
[0033] Optionally, such as Figure 2As shown, the first pipe 1 includes a first branch pipe 11 and a second branch pipe 12. The first branch pipe 11 extends vertically upward from the bottom of the web 100 located to the left of the vertical centerline of the box girder facade to the top plate 200, and then extends horizontally to the right within the top plate 200 to the middle of the top plate 200. The inlet of the first branch pipe 11 is located at the bottom of the web 100, and the outlet of the first branch pipe 11 is located in the middle of the top plate 200. The second branch pipe 12 and the first branch pipe 11 are arranged symmetrically along the vertical centerline of the box girder facade. The arrangement of the first branch pipe 11 and the second branch pipe 12 in both vertical and horizontal directions can simultaneously cover the full height of the web 100 and the central core area of the top plate 200, effectively avoiding vertical temperature differences in the web 100 and lateral temperature differences in the top plate 200. The first branch pipe 11 and the second branch pipe 12, which are arranged symmetrically along the vertical center line of the box girder facade, ensure that the fluid flow and heat dissipation efficiency on the left and right sides of the box girder facade are consistent, prevent local stress concentration caused by uneven cooling on one side, and further improve the temperature uniformity of the web plate 100 and the top plate 200.
[0034] Furthermore, such as Figure 2 As shown, the second pipe 2 includes a third branch pipe 21 and a fourth branch pipe 22. The third branch pipe 21 extends vertically downwards from the top of the web 100 located to the left of the vertical centerline of the box girder facade to the bottom plate 300, and then extends horizontally to the right to the middle of the bottom plate 300. The inlet of the third branch pipe 21 is located at the top of the web 100, and the outlet of the third branch pipe 21 is located in the middle of the bottom plate 300. The fourth branch pipe 22 and the third branch pipe 21 are arranged symmetrically along the vertical centerline of the box girder facade. The arrangement of the third branch pipe 21 and the fourth branch pipe 22 in both vertical and horizontal directions can simultaneously cover the full height of the web 100 and the central core area of the bottom plate 300, effectively avoiding vertical temperature differences in the web 100 and lateral temperature differences in the bottom plate 300. The third branch pipe 21 and the fourth branch pipe 22, which are arranged symmetrically along the vertical center line of the box girder facade, ensure that the fluid flow and heat dissipation efficiency are consistent on both sides of the box girder facade, prevent local stress concentration caused by uneven cooling on one side, and further improve the temperature uniformity of the web plate 100 and the bottom plate 300.
[0035] In one embodiment, when the first pipe 1 and the second pipe 2 of the circulating fluid pipe network are laid out on the same box girder facade, the longitudinal spacing between two adjacent box girder facades with circulating fluid pipe networks is 1m. This 1m spacing ensures effective temperature control while also facilitating the box girder casting process, preventing the circulating fluid pipe network from interfering with concrete pouring and vibration, thus achieving a balance between construction efficiency and temperature control quality.
[0036] In another embodiment, such as Figure 3As shown, when the first pipe 1 and the second pipe 2 of the circulating fluid pipe network are arranged in different box girder facades, the longitudinal spacing between two adjacent box girder facades with the first pipe 1 and the box girder facades with the second pipe 2 is 0.8m. This 0.8m spacing allows for longitudinal staggered coverage of the two different types of pipes, ensuring that the temperature control zones of the top plate 200, web plate 100, and bottom plate 300 complement each other in the longitudinal direction of the box girder, avoiding longitudinal temperature control gaps in any area. This staggered arrangement effectively improves the precision of longitudinal temperature control in the box girder without increasing the total number of pipes.
[0037] Optionally, such as Figure 1 and Figure 2 As shown, the temperature monitoring module includes multiple temperature sensors 3, which are evenly distributed within the web 100, top plate 200, and bottom plate 300 of the box girder. Each temperature sensor 3 is electrically connected to the control module. The temperature sensors 3 cover the core areas of the web 100, top plate 200, and bottom plate 300, acquiring temperature data across the entire box girder and providing a comprehensive and accurate data source for the control module's adjustments. The electrical connection between the temperature sensors 3 and the control module enables real-time transmission of temperature data, allowing the control module to adjust the fluid temperature, flow rate, and volume in a timely manner based on temperature differences at various points within the box girder, achieving dynamic and differentiated precise temperature control.
[0038] For example, the first pipe 1 has a diameter of 60 mm and a wall thickness of 2 mm, while the second pipe 2 has a diameter of 40 mm and a wall thickness of 2 mm. The larger diameter first pipe 1 can transport more fluid, meeting the heat dissipation needs of the web 100 and top plate 200 areas. The smaller diameter second pipe 2 is adapted to the heat dissipation needs of the web 100 and bottom plate 300 areas, avoiding resource waste and overcooling. The 2 mm wall thickness ensures the pipe's pressure resistance and corrosion resistance while reducing the impact of pipe embedding on the overall integrity of the concrete structure, thus balancing temperature control and the safety of the box girder structure.
[0039] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A fluid circulation system for uniform temperature control of box girders, characterized in that, include: A circulating fluid pipe network includes multiple independently arranged first pipes and multiple second pipes. The first pipes are arranged inside the web and top slab, and the multiple first pipes are distributed at intervals along the longitudinal direction of the box girder. The second pipes are arranged inside the web and bottom slab, and the multiple second pipes are distributed at intervals along the longitudinal direction of the box girder. The inlets of the multiple first pipes and multiple second pipes converge to form the total inlet of the circulating fluid pipe network, and the outlets of the multiple first pipes and multiple second pipes converge to form the total outlet of the circulating fluid pipe network. Both the first pipes and the second pipes are filled with fluid. The fluid in the first pipes flows from the web to the top slab, and the fluid in the second pipes flows from the web to the bottom slab. The diameter of the first pipes is larger than the diameter of the second pipes. A temperature control unit, comprising an outlet and an inlet, wherein the outlet of the temperature control unit is connected to the total inlet of the circulating fluid pipe network, and the inlet of the temperature control unit is connected to the total outlet of the circulating fluid pipe network, and the temperature control unit is configured to regulate the temperature and pump the fluid within the circulating fluid pipe network. A temperature monitoring module, configured to monitor the internal temperature of the box girder; A control module is electrically connected to the temperature control host and the temperature monitoring module. The control module is configured to control the temperature control host to adjust the temperature, flow rate and flow rate of the fluid in the circulating fluid pipe network.
2. The fluid circulation system for uniform temperature control of box girders according to claim 1, characterized in that, The first pipeline includes a first branch pipeline and a second branch pipeline. The first branch pipeline extends vertically upward from the bottom of the web plate located to the left of the vertical center line of the box girder facade to the top plate, and extends horizontally to the right to the middle of the top plate. The inlet of the first branch pipeline is located at the bottom of the web plate, and the outlet of the first branch pipeline is located at the middle of the top plate. The second branch pipeline and the first branch pipeline are arranged symmetrically along the vertical center line of the box girder facade.
3. The fluid circulation system for uniform temperature control of box girders according to claim 1, characterized in that, The second pipeline includes a third branch pipeline and a fourth branch pipeline. The third branch pipeline extends vertically downward from the top of the web plate located to the left of the vertical center line of the box girder facade to the bottom plate, and then extends horizontally to the right to the middle of the bottom plate. The inlet of the third branch pipeline is located at the top of the web plate, and the outlet of the third branch pipeline is located in the middle of the bottom plate. The fourth branch pipeline and the third branch pipeline are arranged symmetrically along the vertical center line of the box girder facade.
4. The fluid circulation system for uniform temperature control of box girders according to claim 1, characterized in that, When the first and second pipes of the circulating fluid pipe network are laid out in the same box girder facade, the longitudinal spacing between two adjacent box girder facades where the circulating fluid pipe network is laid out is 1m.
5. The fluid circulation system for uniform temperature control of box girders according to claim 1, characterized in that, When the first and second pipes of the circulating fluid pipe network are laid out in different box girder facades, the longitudinal distance between two adjacent box girder facades with the first pipe and the box girder facades with the second pipe is 0.8m.
6. The fluid circulation system for uniform temperature control of box girders according to any one of claims 1-5, characterized in that, The temperature monitoring module includes multiple temperature sensors, which are evenly distributed inside the web, top plate, and bottom plate of the box girder. Each temperature sensor is electrically connected to the control module.
7. The fluid circulation system for uniform temperature control of box girders according to any one of claims 1-5, characterized in that, The first pipe has a diameter of 60mm and a wall thickness of 2mm, and the second pipe has a diameter of 40mm and a wall thickness of 2mm.
8. The fluid circulation system for uniform temperature control of box girders according to any one of claims 1-5, characterized in that, The fluids filled in the first and second pipes are water or antifreeze.