A mass concrete heat and moisture preservation structure

Abstract

This application discloses a thermal insulation and moisture-retaining structure for large-volume concrete, relating to the field of engineering construction technology, and solving the technical problem of cracking that easily occurs during the thermal insulation and moisture-retaining curing of large-volume concrete. The thermal insulation and moisture-retaining structure includes a composite membrane component, a curing equipment component, a sealed enclosure layer, and a support component. The composite membrane component includes a plastic film, a sealed foam board, and a rock wool blanket, which are sequentially layered on the surface of the large-volume concrete, with the rock wool blanket extending to all sides of the large-volume concrete. The curing equipment component includes several steam curing machines and hot air blowers, which are arranged on top of the large-volume concrete and evenly distributed circumferentially. The sealed enclosure layer covers the outside of the composite membrane component and the curing equipment component. The support component is connected to the curing equipment component and serves to support and position the steam curing machines and hot air blowers. This structure can effectively alleviate the problem of temperature stress cracking caused by insufficient moisture retention and excessive temperature difference in traditional curing methods.

Description

Technical Field

[0001] This application relates to the field of engineering construction technology, and in particular to a large-volume concrete thermal insulation and moisture retention structure. Background Technology

[0002] Mass concrete releases a significant amount of heat during cement hydration, causing its internal temperature to rise rapidly while the surface dissipates heat quickly, resulting in a significant temperature difference between the inside and outside. This temperature difference generates thermal stress, which, when exceeding the tensile strength of the concrete, can easily trigger temperature cracks. This not only compromises the structural integrity but also reduces its durability and load-bearing capacity. Simultaneously, sufficient moisture is required during concrete hardening to ensure complete cement hydration. Excessive moisture loss leads to incomplete hydration, affecting strength development and increasing the likelihood of plastic shrinkage cracks. Therefore, effective thermal insulation and moisture retention are crucial for preventing cracks and ensuring structural safety and performance in mass concrete construction.

[0003] Currently, large-volume concrete is typically kept warm and moist by covering it with a single thin film or ordinary cotton blanket and heating it with dispersed heat sources. However, this curing method either fails to retain moisture effectively, leading to rapid evaporation of surface moisture, or has limited insulation properties, making it difficult to control the temperature difference between the inside and outside, and easily causing uneven local temperature distribution, which in turn makes the surface of large-volume concrete prone to cracking. Utility Model Content

[0004] The main purpose of this application is to provide a thermal insulation and moisture retention structure for large-volume concrete, thereby solving the technical problem that cracks are easily generated during the thermal insulation and moisture retention curing of large-volume concrete.

[0005] To achieve the above objectives, this application provides a large-volume concrete thermal insulation and moisture retention structure, the large-volume concrete thermal insulation and moisture retention structure comprising: A composite membrane assembly, comprising a plastic film, a closed foam board, and a rock wool blanket sequentially layered and laid on the surface of a large volume concrete, wherein the rock wool blanket extends and is laid on each side of the large volume concrete. The curing equipment assembly includes several steam curing machines and hot air blowers, which are arranged on the upper part of the large-volume concrete and evenly distributed along the circumference. A sealed enclosure layer, said sealed enclosure layer covering the outside of the composite coating assembly and the curing equipment assembly; and, The support component is connected to the curing equipment component and serves to support and position the steam curing machine and the hot air blower.

[0006] Optionally, the number of steam curing machines is four, and the four steam curing machines are respectively arranged at the center of the four sides of the rectangular area where the large volume concrete is located, and each steam curing machine is connected to an air pipe at both ends.

[0007] Optionally, the number of hot air blowers is four, and the four hot air blowers are respectively arranged at the four opposite corners of the rectangular area where the large volume concrete is located.

[0008] Optionally, the airflow outlets of each of the hot air blowers are arranged along the diagonal line connecting the rectangular area where the large-volume concrete is located.

[0009] Optionally, the support assembly includes a support frame, a connecting rod, and a hanging rod. The support frame is connected to each of the steam curing machines and the hot air blower. The support frame is connected to the hanging rod through the connecting rod, and the hanging rod is connected to external hoisting equipment.

[0010] Optionally, the support frame is rectangular and matches the trachea, and the support frame is provided with a plurality of clamping parts for clamping and fixing the trachea.

[0011] Optionally, there are two connecting rods, and the two connecting rods are connected in a cross shape, with the two ends of each connecting rod connected to the edge strip of the adjacent support frame.

[0012] Optionally, the hot air blower is connected to the support frame via a universal damper.

[0013] Optionally, the movable end of the universal damper is connected to a first flange, and one end of the hot air blower is connected to a second flange, the first flange and the second flange being connected by bolts.

[0014] Optionally, the universal damper adopts a universal damper ball joint hinge shaft.

[0015] The beneficial effects that this application can achieve are: The large-volume concrete thermal insulation and moisture retention structure proposed in this application utilizes the synergistic effect of multiple materials in a composite membrane component. A plastic film locks in water, a sealed foam board blocks heat exchange, and rock wool provides enhanced insulation and covers the sides, forming a three-dimensional thermal insulation and moisture retention barrier from the surface to the sides, reducing moisture evaporation and internal / external temperature differences. The curing equipment component, consisting of a steam curing machine and a hot air blower evenly distributed circumferentially, can output steam and hot air to the concrete area, actively regulating the ambient temperature and humidity. The outer sealed enclosure layer further seals the curing space, reducing heat and moisture loss. The support component uses stable hoisting to position the curing equipment, ensuring its precise and stable range of action. This structure collaboratively constructs an integrated curing system that combines water retention, thermal insulation, temperature and humidity control, and spatial sealing. It effectively alleviates the temperature stress cracking problems caused by insufficient moisture retention and excessive temperature differences in traditional curing methods, ensuring sufficient cement hydration and stable concrete strength development, thus improving the integrity and durability of the large-volume concrete structure. Attached Figure Description

[0016] Figure 1 This is a top view schematic diagram of a large-volume concrete thermal insulation and moisture retention structure according to an embodiment of this application; Figure 2 This is a top view of a large-volume concrete thermal insulation and moisture retention structure after removing the supporting components, according to an embodiment of this application. Figure 3 Examples of embodiments of this application Figure 2 A schematic diagram of the cross-sectional structure of AA in the diagram; Figure 4 Examples of embodiments of this application Figure 2 A schematic diagram of the cross-sectional structure of BB in the diagram; Figure 5 This is a schematic diagram of the connection structure between the hot air blower and the universal damper in a large-volume concrete thermal insulation and moisture retention structure according to an embodiment of this application.

[0017] The attached figures are labeled as follows: 1-Composite film-coated component; 2-Plastic film; 3-Sealed foam board; 4-Rock wool blanket; 5-Cure equipment component; 6-Steam curing machine; 7-Hot air blower; 8-Support component; 9-Support frame; 10-Connecting rod; 11-Hanging rod; 12-Air pipe; 13-Clamping part; 14-Universal damper; 15-First flange; 16-Second flange; 17-Bolt; 18-Sealed enclosure layer; 19-Mass concrete.

[0018] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Reference Figures 1 to 4 A large-volume concrete thermal insulation and moisture retention structure, comprising: The composite membrane component 1 includes a plastic film 2, a closed foam board 3 and a rock wool blanket 4, which are sequentially laid on the surface of the large volume concrete 19, and the rock wool blanket 4 extends to each side of the large volume concrete 19. The curing equipment component 5 includes several steam curing machines 6 and hot air blowers 7, which are arranged on the upper part of the large-volume concrete 19 and evenly distributed along the circumference. A sealed enclosure layer 18 covers the outside of the composite coating assembly 1 and the curing equipment assembly 5; and, Support component 8 is connected to curing equipment component 5 and serves to support and position the steam curing machine 6 and hot air blower 7 during installation.

[0021] In this embodiment, the steps for thermal insulation and moisture retention curing of large-volume concrete are as follows: After the large-volume concrete 19 is poured, the composite membrane assembly 1 is first installed: plastic film 2, sealed foam board 3, and rock wool blanket 4 are sequentially layered on the concrete surface, and the rock wool blanket 4 is extended to each side of the large-volume concrete 19; then, several steam curing machines 6 and hot air blowers 7 are suspended on the upper part of the large-volume concrete 19 and evenly distributed along its circumference using a support assembly. Finally, a sealed enclosure layer 18 is covered on the outside of the composite membrane assembly 1 and the curing equipment assembly 5.

[0022] During the curing process, pre-curing preparations are necessary, including using a sealed enclosure layer 18 to wrap the concrete to form a sealed space to ensure uniform steam distribution. Temperature monitoring points are set at the center of the component, its surface, and the air outlet of the steam curing machine 6 to monitor the temperature difference in real time (a temperature difference ≤25℃ is recommended). Then, the steam curing stage is controlled. During the heating phase, the steam flow rate is gradually increased from small to large, while the hot air fan 7 outputs airflow diagonally to assist heat diffusion, preventing the component surface from rapidly heating up and cracking. During the heating phase, the temperature increase is ≤10℃ per hour, lasting 4-6 hours. During the constant temperature phase, the steam curing machine 6 maintains a stable steam supply, and the hot air fan 7 runs continuously to promote uniform temperature and humidity distribution, ensuring the center-to-surface temperature difference meets the standard. During the constant temperature phase, the temperature is controlled at 50-60℃, lasting 12-16 hours, maintaining a steam pressure of 0.05-0.1MPa, humidity ≥95%, and a center-to-surface temperature difference ≤15℃. During the cooling phase, the steam valve is gradually closed while the output power of the hot air fan 7 is adjusted to assist in slow cooling. During the cooling phase, the temperature should be reduced by ≤5℃ per hour for 6-8 hours. The steam valve should be gradually closed, and the insulation facilities can only be removed when the temperature difference between the surface of the component and the ambient temperature is ≤20℃.

[0023] During post-curing treatment, if the ambient humidity is <80%, it is necessary to continue to cover and moisturize or spray water for 3-7 days through the plastic film 2 in the composite film component 1. After curing, the strength is tested by the rebound method or core sampling method. Only after the strength meets the standard can the mold be removed or the load be applied.

[0024] The large-volume concrete thermal insulation and moisture retention structure proposed in the above embodiments, through the synergistic effect of multiple materials in the composite membrane component 1, the plastic film 2 locks in water, the sealed foam board 3 blocks heat exchange, and the rock wool blanket 4 strengthens insulation and covers the sides, forming a three-dimensional thermal insulation and moisture retention barrier from the surface to the sides, reducing moisture evaporation and internal and external temperature differences; the steam curing machine 6 and hot air blower 7 of the curing equipment component 5 are evenly distributed circumferentially, which can output steam and hot air to the concrete area and actively regulate the ambient temperature and humidity; the outer sealed enclosure layer 18 further seals the curing space, reducing heat and moisture loss; the support component 8 stabilizes the curing equipment by hoisting it in place, ensuring its effective range of action is precise and stable. The above structure synergistically constructs an integrated curing system of water-locking insulation, temperature and humidity control, and spatial sealing, which can effectively alleviate the problem of temperature stress cracks caused by insufficient moisture retention and excessive temperature difference in traditional curing, ensure sufficient cement hydration and stable development of concrete strength, and improve the integrity and durability of the large-volume concrete structure 19.

[0025] As an alternative implementation, the sealed enclosure layer 18 can be made of tarpaulin.

[0026] It should be noted that the tarpaulin has good flexibility and airtightness, and can tightly cover the outside of the composite film coating component 1 and the curing equipment component 5 to form a closed curing space. Its material properties can effectively block the loss of internal heat and moisture to the outside, and avoid local temperature and humidity fluctuations caused by environmental airflow interference.

[0027] As an alternative implementation method, refer to Figure 1 and Figure 2 There are four steam curing machines 6. The four steam curing machines 6 are respectively located at the center of the four sides of the rectangular area where the large volume concrete 19 is located. Each steam curing machine 6 has an air pipe 12 connected to both ends.

[0028] In this embodiment, the arrangement of the steam curing machine 6 at the center of the edge allows the steam output from the steam curing machine 6 to diffuse evenly along the four sides of the rectangular area through the air pipes 12 connected at both ends, forming a circumferential steam distribution zone around the concrete. This avoids the problem of uneven steam coverage caused by traditional single-point placement. At the same time, the interconnected design of the air pipes 12 enables coordinated steam delivery on all four sides, ensuring that each side and surface of the concrete receives a stable steam supply. Combined with the water-locking and heat-insulating effect of the composite membrane component 1 and the spatial sealing effect of the airtight enclosure layer 18, the humidity balance of the curing area is effectively maintained, reducing the risk of cracks caused by local water shortage or temperature fluctuations.

[0029] As an alternative implementation method, refer to Figure 1 and Figure 2 There are four hot air blowers 7, which are respectively located at the four opposite corners of the rectangular area where the large volume concrete 19 is located.

[0030] In this embodiment, hot air is delivered to the concrete surface or curing space by the hot air blower 7 to increase the ambient temperature and accelerate the cement hydration reaction. At the same time, the diagonal distribution allows the hot air to diffuse from the four corners to the center and the surrounding area, causing the steam output by the steam curing machine 6 to flow evenly within the sealed enclosure layer 18, promoting the uniform distribution of heat within the curing space, effectively reducing the temperature difference between the inside and outside of the concrete, reducing cracks caused by temperature stress, and further ensuring the stability of the curing quality of large-volume concrete 19.

[0031] As an alternative implementation method, refer to Figure 1 and Figure 2 The airflow outlets of each hot air blower 7 are arranged along the diagonal line connecting the rectangular area where the large volume concrete 19 is located.

[0032] In this embodiment, the directional arrangement enables the airflow output by the hot air blower 7 to diffuse along the diagonal line towards the center and opposite side of the rectangular area, forming cross-convection with the steam output by the air pipes 12 distributed along the four sides of the steam curing machine 6, promoting uniform mixing of temperature and humidity in the curing space, and avoiding temperature and humidity imbalance caused by local airflow stagnation.

[0033] As an alternative implementation method, refer to Figure 1 The support assembly 8 includes a support frame 9, a connecting rod 10, and a hanging rod 11. The support frame 9 is connected to each steam curing machine 6 and hot air blower 7. The support frame 9 is connected to the hanging rod 11 through the connecting rod 10. The hanging rod 11 is connected to external hoisting equipment.

[0034] In this embodiment, the support frame 9 directly connects the steam curing machine 6 and the hot air blower 7, which can provide stable support and positioning for the steam curing machine 6 and the hot air blower 7, ensuring that the layout of the steam curing machine 6 along the center and the hot air blower 7 along the diagonal remains accurate and unchanged; the connecting rod 10 connects the support frame 9 to the hanging rod 11, and together with the fixing of the hanging rod 11 to the external hoisting equipment, the steam curing machine 6 and the hot air blower 7 can be hoisted to a preset height on the concrete, and the hoisting height of the steam curing machine 6 and the hot air blower 7 can be adjusted according to actual needs to adapt to various working conditions.

[0035] As an alternative implementation method, refer to Figure 1 The support frame 9 is rectangular and matches the trachea 12. The support frame 9 is provided with several clamping parts 13, which are used to clamp and fix the trachea 12.

[0036] In this embodiment, the rectangular support frame 9 is adapted to the rectangular area of ​​the large volume concrete 19, and the direction of the air pipe 12 can be accurately positioned according to the layout. The clamping part 13 can firmly fix the air pipe 12, so as to prevent the air pipe 12 from shifting or bending due to steam flow or slight external disturbance when the steam curing machine 6 is working, and ensure that the steam is stably delivered along the preset path.

[0037] As an alternative implementation method, refer to Figure 1 There are two connecting rods 10, and the two connecting rods 10 are connected in a cross shape. The two ends of each connecting rod 10 are connected to the edge strip of the adjacent support frame 9 respectively.

[0038] In this embodiment, the cross structure can form a rigid connection between the four sides of the rectangular support frame 9, which enhances the overall structural stability and deformation resistance of the support frame 9 and prevents the support frame 9 from shifting due to the weight of the steam curing machine 6 and the hot air blower 7 or slight external vibrations.

[0039] As an alternative implementation method, refer to Figure 1 The hot air blower 7 is connected to the support frame 9 via the universal damper 14.

[0040] In this embodiment, the universal damper 14 allows the hot air blower 7 to flexibly adjust its angle within a certain range, so that the airflow outlet of the hot air blower 7 can be adaptively turned according to the actual temperature and humidity distribution during the curing process of the large-volume concrete 19 (such as areas with low local temperature), ensuring that the hot air accurately covers the areas that need to be supplemented with heat.

[0041] As an alternative implementation method, refer to Figure 5 The movable end of the universal damper 14 is connected to the first flange 15, and one end of the hot air blower 7 is connected to the second flange 16. The first flange 15 and the second flange 16 are connected by bolts 17.

[0042] In this embodiment, the flange connection method can achieve a stable assembly of the hot air blower 7 and the universal damper 14, ensuring the connection strength of the two to resist the vibration during equipment operation. At the same time, the bolt 17 connection facilitates the flexible disassembly of the hot air blower 7 according to maintenance needs.

[0043] As an alternative implementation, the universal damper 14 adopts a ball joint hinge shaft.

[0044] In this embodiment, the damping characteristics of the ball head can stably maintain the adjusted angle to ensure directional hot air delivery, and can also avoid angle deviation caused by equipment vibration or airflow impact.

[0045] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A mass concrete temperature and moisture preserving structure, characterized by, The large-volume concrete thermal insulation and moisture retention structure includes: A composite membrane assembly, comprising a plastic film, a closed foam board, and a rock wool blanket sequentially layered and laid on the surface of a large volume concrete, wherein the rock wool blanket extends and is laid on each side of the large volume concrete. The curing equipment assembly includes several steam curing machines and hot air blowers, which are arranged on the upper part of the large-volume concrete and evenly distributed along the circumference. A sealed enclosure layer, said sealed enclosure layer covering the outside of the composite coating assembly and the curing equipment assembly; and, The support component is connected to the curing equipment component and serves to support and position the steam curing machine and the hot air blower.

2. The mass concrete temperature and moisture preserving structure according to claim 1, wherein The number of steam curing machines is four, and the four steam curing machines are respectively arranged at the center of the four sides of the rectangular area where the large volume concrete is located. Each steam curing machine is connected to an air pipe at both ends.

3. The mass concrete temperature and moisture preserving structure according to claim 2, wherein The number of hot air blowers is four, and the four hot air blowers are respectively arranged at the four opposite corners of the rectangular area where the large volume concrete is located.

4. The large-volume concrete thermal insulation and moisture retention structure as described in claim 3, characterized in that, The airflow outlets of each of the hot air blowers are arranged along the diagonal line connecting the rectangular area where the large-volume concrete is located.

5. The large-volume concrete thermal insulation and moisture retention structure as described in claim 4, characterized in that, The support assembly includes a support frame, a connecting rod, and a suspension rod. The support frame is connected to each of the steam curing machines and the hot air blower. The support frame is connected to the suspension rod through the connecting rod. The suspension rod is connected to external hoisting equipment.

6. The large-volume concrete thermal insulation and moisture retention structure as described in claim 5, characterized in that, The support frame is rectangular and matches the air tube. The support frame is provided with a plurality of clamping parts, which are used to clamp and fix the air tube.

7. The large-volume concrete thermal insulation and moisture retention structure as described in claim 5, characterized in that, The number of connecting rods is two, and the two connecting rods are connected in a cross shape. The two ends of each connecting rod are respectively connected to the edge strip of the adjacent support frame.

8. The large-volume concrete thermal insulation and moisture retention structure as described in claim 5, characterized in that, The hot air blower is connected to the support frame via a universal damper.

9. The large-volume concrete thermal insulation and moisture retention structure as described in claim 8, characterized in that, The movable end of the universal damper is connected to a first flange, and one end of the hot air blower is connected to a second flange. The first flange and the second flange are connected by bolts.

10. The large-volume concrete thermal insulation and moisture retention structure as described in claim 8, characterized in that, The universal damper uses a universal damper ball joint hinge shaft.

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