Energy-saving and consumption-reducing system for steam curing of large outdoor foundation in winter

Abstract

The utility model discloses a winter large outdoor foundation steam curing energy-saving and consumption-reducing system which comprises a cold box foundation pit, an air separation cold box foundation is arranged on the cold box foundation pit, a windproof curing shed is arranged above the air separation cold box foundation, a central annular PVC (polyvinyl chloride) radiating pipe is arranged in the central area of the air separation cold box foundation, and an outer annular PVC radiating pipe is arranged outside the air separation cold box foundation. A steam outlet in the side portion of the steam generator is connected with a steam inlet of the outer side annular PVC heat dissipation pipe through a steam outlet main pipeline, a water outlet in the bottom of the outer side annular PVC heat dissipation pipe is connected with a condensate water inlet in the side portion of the steam generator through a condensate water pipeline, and a set of spraying devices are evenly arranged on the pipeline where a water outlet in the bottom of the center annular PVC heat dissipation pipe is located. According to the air separation cold box foundation spraying system, the big problem of concrete construction and maintenance in winter in northern areas is solved, the process technical interval period can be effectively shortened, the concrete maintenance period is advanced by about 50%, and meanwhile the turnover period of formwork materials can be prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of concrete curing, in particular to a large-scale outdoor foundation steam curing energy-saving and consumption-reducing system in winter. Background Art

[0002] Concrete performance is primarily determined by factors such as its composition, mix, and curing. Given a certain set of raw materials, mix proportions, and construction techniques, concrete curing, particularly the control of early curing methods, temperature, humidity, and duration, significantly impacts the concrete's hydration reaction, hardening degree, strength development, and durability.

[0003] Curing temperature significantly influences the rate of early concrete performance development. Generally speaking, the higher the curing temperature, the faster the strength development. Research has shown that when the temperature drops below a certain limit, the cement hydration reaction ceases, and concrete strength development completely stops. This temperature is around -10°C. In fact, at temperatures below 0°C, the water in concrete begins to freeze, increasing its volume by 9%, which can lead to frost heave damage. Furthermore, if the environment in which concrete is initially exposed lacks sufficient humidity, the hydration reaction can cause significant evaporation of water from the concrete. The consequences: first, drying loss hinders further cement hydration; second, drying shrinkage increases, causing the concrete to experience tensile stresses caused by shrinkage while still at low strength, leading to early cracking. Therefore, in winter, where the temperature swings between day and night are large and temperatures drop below freezing, steam curing is often used to ensure that the concrete meets the required temperature and humidity requirements during the initial curing process, thereby maintaining its strength and various properties.

[0004] In the northern region, antifreeze maintenance of concrete is a difficult point in the construction of civil engineering projects in winter, and it is also the key to the effective construction of the entire project. The steam curing method for large-scale concrete construction in winter is currently more widely used in the maintenance of large-scale PC concrete components, such as large-scale PC bridge components. The entire curing process is carried out indoors and is a factory operation. The purpose is to accelerate the dispersion and hardening of concrete, shorten the demoulding time, speed up the mold turnover, and improve production efficiency. However, the use of steam curing for large-scale outdoor foundations in winter is not common. Instead, the method of covering the concrete with a quilt is more common.

[0005] In addition, normal steam maintenance is to determine whether steam is supplied by manually measuring the temperature and humidity of the maintenance. Therefore, the maintenance quality is closely related to the operator's sense of responsibility. In particular, temperature measurement is difficult to implement at night, so there are certain limitations.

[0006] To this end, the utility model proposes an efficient and convenient winter large-scale outdoor foundation steam maintenance energy-saving and consumption-reducing system. Utility Model Content

[0007] In view of the problems existing in the prior art, the purpose of this utility model is to propose an energy-saving and consumption-reducing system for steam curing of large outdoor foundations in winter, which solves a major problem of winter concrete construction and curing in northern regions.

[0008] To achieve the above purpose, the technical solution of the utility model is as follows:

[0009] A large-scale outdoor foundation steam maintenance energy-saving and consumption-reducing system in winter includes a cold box foundation pit, an air separation cold box foundation is arranged on the cold box foundation pit, the system includes a steam generator, a windproof maintenance shed and a group of spray devices, a windproof maintenance shed is provided above the air separation cold box foundation, a central annular PVC heat dissipation pipe is arranged in the central area of the air separation cold box foundation, and an outer annular PVC heat dissipation pipe is arranged on the outside, the steam outlet on the side of the steam generator is connected to the steam inlet of the outer annular PVC heat dissipation pipe through a steam outlet main line, the bottom water outlet of the outer annular PVC heat dissipation pipe is connected to the condensate inlet on the side of the steam generator through a condensate pipe, the top water inlet of the central annular PVC heat dissipation pipe is connected to the outside water through a tap water main line, and the pipeline where the bottom water outlet of the central annular PVC heat dissipation pipe is located is divided into two branches, one of which is: a group of spray devices are evenly arranged on the pipeline where the bottom water outlet of the central annular PVC heat dissipation pipe is located, and the spray device is aimed at the air separation cold box foundation.

[0010] Furthermore, another branch of the pipeline where the bottom water outlet of the central annular PVC radiator pipe is located is: the bottom water outlet of the central annular PVC radiator pipe is connected to the supplementary water inlet on the side of the steam generator through a supplementary water pipeline, and the supplementary water pipeline is provided with a central annular water pipe condensate recovery valve.

[0011] Furthermore, a steam outlet bypass waterway is provided between the steam outlet main line and the tap water main line, wherein the steam outlet bypass waterway is provided with an electric steam outlet bypass waterway valve, and the tap water main line is provided with an external water inlet concrete foundation waterway valve.

[0012] Furthermore, an electric steam main outlet valve is provided on the steam main outlet line.

[0013] Furthermore, a foundation surface moisturizing water valve is provided on the pipeline where the bottom water outlet of the central annular PVC heat dissipation pipe equipped with a spray device is located; a maintenance shed steam series pipeline is provided between the steam outlet main pipeline and the pipeline where the bottom water outlet of the central annular PVC heat dissipation pipe equipped with a spray device is located, and a maintenance shed steam series heating valve is provided on the pipeline.

[0014] Furthermore, an outer annular water pipe condensate return steam generator valve is provided on the condensate water pipeline between the bottom water outlet of the outer annular PVC heat dissipation pipe and the condensate water inlet on the side of the steam generator, and a subsequent section water channel is provided on the condensate water pipeline, and excess hot condensate on the subsequent section water channel goes to the subsequent section water valve.

[0015] Furthermore, a central ring and outer ring water pipe condensate connecting pipeline is provided between the condensed water pipeline and the make-up water pipeline, and a central ring and outer ring water pipe condensate connecting valve is provided on the pipeline.

[0016] Furthermore, the water inlet on the side of the steam generator is connected to the external water through a pipeline, and the pipeline is provided with an external water inlet valve of the steam generator.

[0017] Furthermore, a temperature monitoring point 1 is provided on the upper part of the air separation cold box foundation, a temperature monitoring point 2 and a temperature monitoring point 3 are provided in the center and the lower part respectively, and a dry and wet temperature monitoring point is provided in the windproof maintenance shed.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1) Using the system of this utility model, when the temperature of the central hydration reaction rises, in order to cool the center and recycle the waste heat of the center, a water pipe is arranged in a ring in the central area of the air separation cold box foundation and a central temperature monitoring point is set. When the temperature monitoring point TE02 is greater than 60°C, 0 When the temperature is high, open the external water inlet concrete foundation water valve V1 and the central annular water pipe condensate recovery valve V4, and at the same time close the electric steam outlet bypass valve V2, the foundation surface moisturizing water valve V5, the central and outer ring water pipe condensate connecting valve V6, and the curing shed steam series temperature raising valve V10, so that the external normal temperature water enters the central annular pipe of the concrete to cool the center of the foundation. After passing through the pipe arranged in the center of the foundation, the normal temperature water enters the electric steam generator as make-up water, fully recovering the heat energy and achieving the purpose of energy saving and consumption reduction.

[0020] 2) This system solves a major problem in winter concrete construction and maintenance in northern China. It can effectively shorten the technical gap between processes and shorten the concrete curing cycle by about 50%. It can also improve the turnover period of formwork materials and reduce the cost of manpower and turnover materials.

[0021] 3) The steam generator of this utility model is an intelligent variable frequency electric steam generator. According to the changes in steam usage and the trends of pressure and temperature rise and fall, the system can automatically start and stop modules, and intelligently convert the frequency to the heat supply and demand state, truly providing energy on demand and avoiding energy waste. When each module is turned on, it operates at the actual demand load, and there will be no attenuation of thermal efficiency. It can always maintain high efficiency and energy-saving operation, greatly reducing human resource investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of the utility model system.

[0023] In the figure: 1. Steam generator; 2. Windproof curing shed; 3. Sprinkler; 4. Outer ring PVC heat dissipation pipe; 5. Center ring PVC heat dissipation pipe; V1. External water inlet valve for concrete foundation; V2. Electric steam outlet bypass valve; V3. Electric steam outlet main valve; V4. Condensate recovery valve for center ring water pipe; V5. Foundation surface moisturizing water valve; V6. Condensate connecting valve between center and outer ring water pipes; V7. Valve for excess condensate to subsequent work sections; V8. Condensate return valve for outer ring water pipe to steam generator; V9. External water inlet valve for steam generator; V10. Steam series temperature raising valve for curing shed; TE01. Temperature monitoring point one; TE02. Temperature monitoring point two; TE03. Temperature monitoring point three; TE04. Dry and wet temperature monitoring points. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings, but the scope of protection of the present invention is not limited to the described scope.

[0025] Please refer to Figure 1 , a large-scale outdoor foundation steam curing energy-saving and consumption-reducing system in winter, including a cold box foundation pit, an air separation cold box foundation is arranged on the cold box foundation pit, the system includes a steam generator 1, a windproof curing shed 2 and a group of spray devices 3, a windproof curing shed 2 is arranged above the air separation cold box foundation, scaffolding is set up around the foundation, and a closed windproof, rainproof and snowproof thermal insulation curing shed is set up within 1m from the outer surface of the concrete using rainproof cloth.

[0026] In this embodiment, steam generator 1 is an intelligent variable-frequency electric steam generator. Based on changes in steam usage and pressure and temperature trends, the system automatically switches modules on and off, intelligently varying the frequency to match heat supply and demand. This ensures on-demand energy supply and avoids energy waste. Each module operates at the actual load demand, eliminating thermal efficiency degradation and maintaining efficient, energy-saving operation.

[0027] A central annular PVC heat dissipation pipe 5 is arranged in the central area of the air separation cold box foundation.

[0028] During the curing period of large-volume concrete, the central hydration reaction temperature will rise. In order to cool the center and recycle the waste heat, water pipes are arranged in a circular manner in the center of the concrete and a central temperature monitoring point is set. When the temperature monitoring point TE02 is greater than 60°C 0At this time, open the external water inlet concrete foundation water valve V1 and the central ring water pipe condensate recovery valve V4. Simultaneously close the electric steam outlet bypass valve V2, the foundation surface moisturizing water valve V5, the central and outer ring water pipe condensate connecting valve V6, and the curing shed steam series temperature increase valve V10. This allows external room-temperature water to enter the central ring pipe of the concrete to cool the center of the foundation. After passing through the central pipe of the foundation, the room-temperature water enters the electric steam generator as makeup water. This fully utilizes heat energy recovery and achieves energy conservation and consumption reduction.

[0029] An outer annular PVC heat dissipation pipe 4 is arranged outside the air separation cold box foundation, specifically 300-600 mm inward from the exterior of the air separation cold box foundation. Open the electric steam outlet main valve V3 and the outer annular water pipe condensate return valve V8 to the steam generator. Close the electric steam outlet bypass valve V2 and the condensate connecting valve V6 between the center and outer ring water pipes. Steam from steam generator 1 is introduced into the pipe inside the concrete surface to heat and cure the concrete. The condensate in the pipe is then returned to the electric steam heater for secondary heating and reuse as steam.

[0030] The steam outlet on the side of the steam generator 1 is connected to the steam inlet of the outer annular PVC heat dissipation pipe 4 via a steam outlet main line, which is equipped with an electric steam outlet valve V3. The bottom water outlet of the outer annular PVC heat dissipation pipe 4 is connected to the condensate inlet on the side of the steam generator 1 via a condensate line. The top water inlet of the central annular PVC heat dissipation pipe 5 is connected to the outside water via a tap water main line. The pipeline where the bottom water outlet of the central annular PVC heat dissipation pipe 5 is located is divided into two branches. One branch consists of a group of spray devices 3 evenly distributed along the pipeline where the bottom water outlet of the central annular PVC heat dissipation pipe 5 is located. The spray devices 3 are aimed at the foundation of the air separation cold box.

[0031] Another branch of the pipeline where the bottom water outlet of the central annular PVC radiator pipe 5 is located is: the bottom water outlet of the central annular PVC radiator pipe 5 is connected to the supplementary water inlet on the side of the steam generator 1 through a supplementary water pipeline, and the supplementary water pipeline is provided with a central annular water pipe condensate recovery valve V4.

[0032] A steam outlet bypass waterway is provided between the steam outlet main line and the tap water main line, wherein the steam outlet bypass waterway is provided with an electric steam outlet bypass waterway valve V2, and the tap water main line is provided with an external water inlet concrete foundation waterway valve V1.

[0033] A basic surface moisturizing water valve V5 is provided on the pipeline where the bottom water outlet of the central annular PVC heat dissipation pipe 5 with the spray device 3 is located.

[0034] A curing shed steam series pipeline is provided between the steam outlet main pipeline and the pipeline where the bottom water outlet of the central annular PVC heat dissipation pipe 5 with the spray device 3 is located. The pipeline is provided with a curing shed steam series temperature rising valve V10.

[0035] An outer ring water pipe condensate return steam generator valve V8 is provided on the condensate pipe between the bottom water outlet of the outer ring PVC heat dissipation pipe 4 and the condensate inlet on the side of the steam generator 1. A subsequent section water channel is provided on the condensate pipe, and the excess hot condensate on the subsequent section water channel goes to the subsequent section water valve V7.

[0036] A central ring and outer ring water pipe condensate connecting pipeline is provided between the condensate pipeline and the make-up water pipeline, and a central ring and outer ring water pipe condensate connecting pipeline valve V6 is provided on the pipeline.

[0037] The water inlet on the side of the steam generator 1 is connected to the external water through a pipeline, and the pipeline is provided with a steam generator external water inlet valve V9.

[0038] The upper part of the air separation cold box foundation is provided with a temperature monitoring point 1 TE01, and the center and lower parts thereof are provided with a temperature monitoring point 2 TE02 and a temperature monitoring point 3 TE03 respectively.

[0039] Thermometers are arranged on the upper, middle and lower symmetrical axes at different positions in the concrete to monitor the temperature difference between adjacent measuring points of the concrete. The temperature difference cannot be greater than 25°C, and the temperature difference between the concrete surface and the atmosphere cannot be greater than 20°C. When the temperature difference deviates, the opening of the steam inlet valve or the external water inlet valve is interlocked to control the temperature difference, which is too large and affects the quality of the concrete.

[0040] 1) When TE02-TE01 or TE02-TE03 is a positive number and greater than 25°C, open the external water inlet concrete foundation water valve V1 and the central ring water pipe condensate recovery valve V4. At the same time, close the electric steam outlet bypass valve V2, the foundation surface moisturizing water valve V5, the central and outer ring water pipe condensate connecting valve V6, and the curing shed steam series temperature rise valve V10.

[0041] 2) When TE02-TE01 or TE02-TE03 is negative and greater than 25°C, open the electric steam bypass water valve V2 and the central ring water pipe condensate recovery valve V4, and close the external water inlet concrete foundation water valve V1, the foundation surface moisturizing water valve V5, and the curing shed steam series temperature rise valve V10;

[0042] A dry, wet and temperature monitoring point TE04 is provided in the windproof curing shed 2 to monitor the dry, wet and ambient temperature in the windproof curing shed 2.

[0043] When TE04 detects that the concrete surface humidity is less than 85%, it opens the foundation surface moisturizing water valve V5, closes the center ring water pipe condensate recovery valve V4, and the center ring and outer ring water pipe condensate connecting valve V6, and opens the sprinkler valve to spray water. If the water supply is insufficient, it opens the center ring and outer ring water pipe condensate connecting valve V6, closes the excess hot condensate to subsequent sections valve V7, and closes the outer ring water pipe condensate return valve V8 to the steam generator.

[0044] When the temperature of TE04 is lower than 5℃, close the bypass water valve V2 of the electric steam outlet and the foundation surface moisturizing water valve V5, open the main valve V3 of the electric steam outlet and the steam series temperature rise valve V10 of the curing shed, and spray sand and steam onto the concrete surface, while moisturizing and heating the curing shed.

[0045] The system of this utility model adopts steam curing, which can effectively shorten the technical gap period of the process and advance the concrete curing cycle by about 50%. At the same time, it can improve the turnover period of the formwork materials, so that the civil construction cycle of the entire project can be completed about 2 months earlier, reducing the investment cost of manpower and turnover materials, and bringing real economic benefits to the enterprise. The use of the steam curing method solves a major problem of concrete construction and maintenance in winter in northern regions.

[0046] The system of the utility model adopts an electric steam generator with variable frequency control, which intelligently converts the frequency to the state of heat supply and demand. After the windproof curing shed is built for the concrete foundation, the steam output and the ratio of external water are automatically controlled according to the concrete temperatures collected at multiple positions, so that the concrete foundation in the shed is always within a more suitable temperature and humidity range; at the same time, the performance characteristic that the temperature of the hydration reaction in the center of large-volume concrete will increase is utilized to cool the center while recycling the waste heat, and the external water is led back to the electric steam generator as replenishing water through the annular pipe arranged in the center of the concrete; at the same time, the steam sent out by the evaporator exchanges heat with the concrete through the annular pipe arranged outside the foundation, and the condensed water generated can also be recycled into the electric steam generator for reuse. If there is excess condensed hot water, it can also be sent to the outside working section that needs hot water, such as on-site plastering, mortar mixing water, etc. By optimizing the ratio, comprehensive water-saving and energy-saving effects are achieved. Calculations have shown that the use of this system solution can effectively shorten the technical gap period between processes and advance the concrete curing cycle by about 50%. It can also improve the turnover period of formwork materials, and the fully automatic control of thermal insulation and moisture retention solutions also reduces the cost of manpower and turnover material investment.

Claims

1. Winter large-scale outdoor foundation steam curing energy saving and consumption reduction system, including cold box foundation pit, on which air separation cold box foundation is installed, characterized by The system comprises a steam generator (1), a windproof curing shed (2) and a group of spray devices (3). A windproof curing shed (2) is provided above the air separation cold box foundation. A central annular PVC heat dissipation pipe (5) is arranged in the central area of the air separation cold box foundation, and an outer annular PVC heat dissipation pipe (4) is arranged outside the central annular PVC heat dissipation pipe (5). The steam outlet on the side of the steam generator (1) is connected to the steam inlet of the outer annular PVC heat dissipation pipe (4) through a steam outlet main line. The bottom water outlet of the outer annular PVC heat dissipation pipe (4) is connected to the condensate inlet on the side of the steam generator (1) through a condensate water line. The top water inlet of the central annular PVC heat dissipation pipe (5) is connected to the external water through a tap water line. The pipeline where the bottom water outlet of the central annular PVC heat dissipation pipe (5) is located is divided into two branches. One branch is: a group of spray devices (3) are evenly arranged on the pipeline where the bottom water outlet of the central annular PVC heat dissipation pipe (5) is located, wherein the spray devices (3) are aimed at the air separation cold box foundation.

2. The winter large-scale outdoor basic steam maintenance energy saving and consumption reduction system according to claim 1 is characterized in that Another branch of the pipeline where the bottom water outlet of the central annular PVC heat dissipation pipe (5) is located is: the bottom water outlet of the central annular PVC heat dissipation pipe (5) is connected to the supplementary water inlet on the side of the steam generator (1) through a supplementary water pipeline, and the supplementary water pipeline is provided with a central annular water pipe condensate recovery valve (V4).

3. The winter large-scale outdoor basic steam maintenance energy saving and consumption reduction system according to claim 1 is characterized in that A steam outlet bypass waterway is provided between the steam outlet main line and the tap water main line, wherein the steam outlet bypass waterway is provided with an electric steam outlet bypass waterway valve (V2), and the tap water main line is provided with an external water inlet concrete foundation waterway valve (V1).

4. The winter large-scale outdoor basic steam maintenance energy saving and consumption reduction system according to claim 1 or 3 is characterized in that The main steam outlet line is provided with an electric steam outlet valve (V3).

5. The winter large-scale outdoor basic steam maintenance energy saving and consumption reduction system according to claim 1 is characterized in that A foundation surface moisturizing water valve (V5) is provided on the pipeline where the bottom water outlet of the central annular PVC heat dissipation pipe (5) provided with the spray device (3) is located; a curing shed steam series pipeline is provided between the steam outlet main pipeline and the pipeline where the bottom water outlet of the central annular PVC heat dissipation pipe (5) provided with the spray device (3) is located, and a curing shed steam series temperature-raising valve (V10) is provided on the pipeline.

6. The winter large-scale outdoor basic steam maintenance energy saving and consumption reduction system according to claim 5 is characterized in that An outer annular water pipe condensate return steam generator valve (V8) is provided on the condensate water pipeline between the bottom water outlet of the outer annular PVC heat dissipation pipe (4) and the condensate water inlet on the side of the steam generator (1). A subsequent section water channel is provided on the condensate water pipeline, and excess hot condensate on the subsequent section water channel is sent to the subsequent section water valve (V7).

7. The winter large-scale outdoor basic steam maintenance energy saving and consumption reduction system according to claim 2 is characterized in that A central ring and outer ring water pipe condensate connecting pipeline is provided between the condensate pipeline and the make-up water pipeline, and a central ring and outer ring water pipe condensate connecting valve (V6) is provided on the pipeline.

8. The winter large-scale outdoor basic steam maintenance energy saving and consumption reduction system according to claim 1 is characterized in that The water inlet on the side of the steam generator (1) is connected to external water through a pipeline, and the pipeline is provided with a steam generator external water inlet valve (V9).

9. The winter large-scale outdoor basic steam maintenance energy saving and consumption reduction system according to claim 1 is characterized in that The upper part of the air separation cold box base is provided with a temperature monitoring point 1 (TE01), the center and lower parts thereof are provided with a temperature monitoring point 2 (TE02) and a temperature monitoring point 3 (TE03), and the windproof curing shed (2) is provided with a dry and wet temperature monitoring point (TE04).

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