A maintenance device and maintenance method for ordinary concrete walls in cold regions

Abstract

The present invention discloses a maintenance device and maintenance method for ordinary concrete walls in cold regions, which relates to the technical field of civil engineering, and includes a first phase-change energy storage concrete board, a second phase-change energy storage concrete board, a fireproof board, a heat preservation board, a solar panel, a first temperature sensing component, a second temperature sensing component, a third temperature sensing component, a thermostat and a plurality of electric heating cables, wherein the first phase-change energy storage concrete board, the second phase-change energy storage concrete board, the fireproof board, the heat preservation board and the solar panel are sequentially connected through a connecting assembly, a plurality of electric heating cables are embedded in the surface of the second phase-change energy storage concrete board, the first temperature sensing component is arranged in the first phase-change energy storage concrete board, the second temperature sensing component is used to be arranged on the surface of cast-in-place concrete, and the third temperature sensing component is used to be arranged in cast-in-place concrete. The maintenance device and maintenance method shorten the construction period, reduce the cost, are more energy-saving and environmentally friendly, have high safety, and realize precise temperature control and intelligent maintenance.

Description

Technical Field

[0001] The present invention relates to the technical field of civil engineering, and in particular to a maintenance device and a maintenance method for ordinary concrete walls in cold regions. Background Art

[0002] During construction in low-temperature environments such as winter, improper concrete curing will cause cracks, and insufficient strength will affect durability. In order to prevent early freezing and freeze-thaw damage to concrete, engineers have adopted many curing methods. Traditional curing methods such as heat storage, comprehensive heat storage, electric heating, and greenhouse can all be applied to construction, but for some projects with tight deadlines, the above traditional methods are no longer applicable. In addition, traditional wooden formwork, aluminum formwork, and steel formwork have the disadvantages of poor thermal insulation performance, high cost, time-consuming and labor-intensive, and low turnover rate in winter concrete curing. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a maintenance device and a maintenance method for ordinary concrete walls in cold regions, which shortens the construction period, reduces costs, is more energy-saving and environmentally friendly, has high safety, and realizes precise temperature control and intelligent maintenance.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a maintenance device for ordinary concrete walls in cold regions, comprising a first phase-change energy storage concrete plate, a second phase-change energy storage concrete plate, a fireproof plate, a heat-insulating plate, a solar cell panel, a connecting assembly, a first temperature sensing component, a second temperature sensing component, a third temperature sensing component, a thermostat and a plurality of electric heating tapes, wherein the first phase-change energy storage concrete plate, the second phase-change energy storage concrete plate, the fireproof plate, the heat-insulating plate and the solar cell panel are sequentially connected through the connecting assembly, the first phase-change energy storage concrete plate is used to be close to cast-in-place concrete, a plurality of the electric heating tapes are embedded in the surface of the second phase-change energy storage concrete plate, the electric heating tapes are connected to the solar cell panel, the first temperature sensing component is arranged in the first phase-change energy storage concrete plate, the second temperature sensing component is used to be arranged on the surface of the cast-in-place concrete, the third temperature sensing component is used to be arranged in the cast-in-place concrete, and the electric heating tapes, the solar cell panel, the first temperature sensing component, the second temperature sensing component and the third temperature sensing component are all connected to the thermostat.

[0006] Preferably, a plurality of strip grooves are provided on the side of the second phase-change energy storage concrete slab close to the first phase-change energy storage concrete slab and the side close to the fireproof board, and one of the electric heating belts is installed in each of the strip grooves.

[0007] Preferably, the melting point of the phase change material of the first phase change energy storage concrete slab is higher than the melting point of the phase change material of the second phase change energy storage concrete slab.

[0008] Preferably, the connecting assembly includes a plurality of bolts and a plurality of nuts, each of the bolts passes through the first phase change energy storage concrete board, the second phase change energy storage concrete board, the fireproof board, the thermal insulation board and the solar panel in sequence, and the nut is installed on one end of the bolt extending from the solar panel.

[0009] Preferably, the fireproof board and the thermal insulation board are bonded to each other via an adhesive, and the thermal insulation board and the solar cell panel are bonded to each other via an adhesive.

[0010] Preferably, the adhesive is an acrylic resin adhesive.

[0011] Preferably, the first phase-change energy storage concrete board and the second phase-change energy storage concrete board are both fly ash ceramsite paraffin boards, the fireproof boards are fireproof graphite polystyrene boards, and the thermal insulation boards are nylon asbestos composite boards.

[0012] Preferably, the first temperature sensing component is a first temperature sensor, the second temperature sensing component is a second temperature sensor, and the third temperature sensing component is a third temperature sensor.

[0013] The present invention also provides a maintenance method based on a maintenance device for ordinary concrete walls in cold regions, comprising the following steps: supporting the maintenance device for ordinary concrete walls in cold regions at a construction site, pouring the cast-in-place concrete on the side of the first phase change energy storage concrete slab away from the second phase change energy storage concrete slab, arranging the first temperature sensing component in the first phase change energy storage concrete slab, arranging the second temperature sensing component on the surface of the cast-in-place concrete, and arranging the third temperature sensing component at the center inside the cast-in-place concrete; when the third temperature sensing component detects that the temperature is lower than 10°C, the thermostat controls the solar panel to energize the electric heating belt; when the temperature detected by the first temperature sensing component reaches the melting point of the phase change material of the first phase change energy storage concrete slab, the thermostat controls the solar panel to de-energize the electric heating belt; during the maintenance process, a temperature-time relationship curve is established according to the temperature measured by the third temperature sensing component, and then the maturity formula is used to measure the strength of the cast-in-place concrete; when the strength of the cast-in-place concrete reaches the critical strength value of concrete freezing, the electric heating maintenance is stopped.

[0014] Compared with the prior art, the present invention has achieved the following technical effects:

[0015] The present invention provides a maintenance device and a maintenance method for ordinary concrete walls in cold regions. The cast-in-place concrete is heated by combining an electric heating tape + a phase change energy storage concrete board. The electric heating tape is powered by a solar panel. The phase change material is liquefied by energizing the electric heating tape. After power failure, the first phase change energy storage concrete board and the second phase change energy storage concrete board generate heat to provide the required temperature for maintenance. The combination of the electric heating tape + the phase change energy storage concrete board shortens the construction period, reduces the cost, has high safety, and has a good maintenance effect. The device and method are particularly suitable for engineering projects with tight construction periods in cold regions. The innermost first phase change energy storage concrete board is in contact with the cast-in-place concrete. After maintenance, the board can be retained without being removed or demolded, and other boards can be directly removed. The first phase change energy storage concrete board is also used as a thermal insulation decorative board, which plays a role in the integration of thermal insulation and decorative structures, and is in line with the development direction of future low-energy consumption buildings. The maintenance process does not need to rely on human supervision throughout the process. Accurate temperature control is achieved by using a thermostat, a first temperature sensing component, a second temperature sensing component, and a third temperature sensing component. At the same time, solar panels are used to intermittently power the electric heating tape, which is more energy-saving and realizes intelligent maintenance. The maintenance device and method are safe and environmentally friendly, and can keep the temperature of the cast-in-place concrete within a range suitable for strength growth, ensuring the growth of the later strength of the cast-in-place concrete. The maintenance device in the present invention can be used multiple times. If the electric heating tape is damaged, it can be removed from the second phase change energy storage concrete plate in time for recycling and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the structure of the maintenance device for ordinary concrete walls in cold regions provided by the present invention;

[0018] Figure 2 A schematic diagram of the structure of the second phase-change energy storage concrete slab in the maintenance device for ordinary concrete walls in cold regions provided by the present invention;

[0019] Figure 3 A schematic diagram of the structure of the electric heating belt in the maintenance device for ordinary concrete walls in cold regions provided by the present invention;

[0020] Figure 4 A schematic structural diagram of a connection assembly in a maintenance device for ordinary concrete walls in cold regions provided by the present invention.

[0021] Explanation of the accompanying drawings: 100. Maintenance device for ordinary concrete walls in cold regions; 1. First phase change energy storage concrete board; 2. Second phase change energy storage concrete board; 3. Fireproof board; 4. Insulation board; 5. Solar cell panel; 6. Strip groove; 7. Electric heating belt; 8. Through hole; 9. Bolt; 10. Nut. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] The purpose of the present invention is to provide a maintenance device and a maintenance method for ordinary concrete walls in cold regions, which shortens the construction period, reduces costs, is more energy-saving and environmentally friendly, has high safety, and realizes precise temperature control and intelligent maintenance.

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] like Figure 1-Figure 4 As shown, this embodiment provides a maintenance device 100 for ordinary concrete walls in cold regions, including a first phase change energy storage concrete board 1, a second phase change energy storage concrete board 2, a fireproof board 3, a heat preservation board 4, a solar cell panel 5, a connection component, a first temperature sensing component, a second temperature sensing component, a third temperature sensing component, a thermostat and a plurality of electric heating cables 7. The first phase change energy storage concrete board 1, the second phase change energy storage concrete board 2, the fireproof board 3, the heat preservation board 4 and the solar cell panel 5 are connected in sequence through the connection component. The first phase change energy storage concrete board 1 is used to be close to the Cast-in-place concrete, multiple electric heating tapes 7 are embedded in the surface of the second phase change energy storage concrete slab 2, the electric heating tapes 7 are connected to the solar cell panel 5, the first temperature sensing component is arranged in the first phase change energy storage concrete slab 1, the second temperature sensing component is used to be arranged on the surface of the cast-in-place concrete, the third temperature sensing component is used to be arranged in the cast-in-place concrete, the electric heating tapes 7, the solar cell panel 5, the first temperature sensing component, the second temperature sensing component and the third temperature sensing component are all connected to the thermostat, and the thermostat controls the solar cell panel 5 to power on or off the electric heating tapes 7.

[0026] In this embodiment, the thermal insulation performance is improved by adopting a composite structure of a multi-layer board. The cast-in-place concrete is heated by combining the electric heating tape 7 and the phase change energy storage concrete board. The solar panel 5 is used to power the electric heating tape 7. The phase change material is liquefied by energizing the electric heating tape 7. After power failure, the first phase change energy storage concrete board 1 and the second phase change energy storage concrete board 2 generate heat to provide the required temperature for maintenance. The combination of the electric heating tape 7 and the phase change energy storage concrete board shortens the construction period, reduces the cost, has high safety, and has a good maintenance effect. It is particularly suitable for engineering projects with tight construction periods in cold areas. The innermost first phase change energy storage concrete board 1 is in contact with the cast-in-place concrete. After maintenance, this board can be retained without removal or demoulding, and other boards can be directly removed. The first phase change energy storage concrete board 1 is also used as a thermal insulation decorative board, which plays a role in integrating thermal insulation and decorative structures, and is in line with the development direction of future low-energy consumption buildings. The maintenance process does not need to rely on human supervision throughout the process. Accurate temperature control is achieved by using a thermostat, a first temperature sensing component, a second temperature sensing component, and a third temperature sensing component. At the same time, solar panels are used to intermittently power the electric heating tape, which is more energy-saving and realizes intelligent maintenance. The maintenance device and method are safe and environmentally friendly, and can keep the temperature of the cast-in-place concrete within a range suitable for strength growth, ensuring the later strength growth of the cast-in-place concrete. The maintenance device in this embodiment can be used multiple times. If the electric heating tape 7 is damaged, it can be removed from the second phase change energy storage concrete plate 2 in time for recycling and replacement.

[0027] Specifically, a plurality of strip grooves 6 are provided on one side of the second phase change energy storage concrete slab 2 close to the first phase change energy storage concrete slab 1 and on the other side close to the fireproof slab 3, and an electric heating tape 7 is installed in each strip groove 6, that is, electric heating tapes 7 are provided on both sides of the second phase change energy storage concrete slab 2 to facilitate heat storage of the phase change concrete.

[0028] Specifically, the melting point of the phase change material of the first phase change energy storage concrete slab 1 is higher than the melting point of the phase change material of the second phase change energy storage concrete slab 2. The first phase change energy storage concrete slab 1 is not dismantled after the maintenance is completed, and is directly used as the later decoration and insulation of the building structure, and its melting point is relatively high; the second phase change energy storage concrete slab 2 is inlaid with electric heating tapes 7 on both sides, and its melting point is relatively low. Considering the hydration heat release of cast-in-place concrete itself, in order to avoid excessive temperature difference between the inside and outside of the concrete, in this embodiment, the melting point of the first phase change energy storage concrete slab 1 on the inside is appropriately increased, so that the heat release time of the first phase change energy storage concrete slab 1 is extended to ensure that the temperature difference between the inside and outside of the cast-in-place concrete does not exceed 20°C, and at the same time, it is also necessary to ensure that the temperature at the center of the cast-in-place concrete is not lower than 5°C.

[0029] like Figure 4As shown, the connection assembly includes a plurality of bolts 9 and a plurality of nuts 10, each bolt 9 passes through the first phase change energy storage concrete board 1, the second phase change energy storage concrete board 2, the fireproof board 3, the insulation board 4 and the solar panel 5 in sequence, and the end of the bolt 9 extending from the solar panel 5 is installed with a nut 10. The bolt connection method is convenient for disassembly after maintenance. The second phase change energy storage concrete board 2, the fireproof board 3, the insulation board 4 and the solar panel 5 can be removed after the cast-in-place concrete maintenance work is completed. A through hole 8 for installing the bolt 9 is respectively provided at the four corners of the first phase change energy storage concrete board 1, the second phase change energy storage concrete board 2, the fireproof board 3, the insulation board 4 and the solar panel 5. When the maintenance is completed and the disassembly is required, the plurality of nuts 10 are removed, and the solar panel 5, the insulation board 4, the fireproof board 3 and the second phase change energy storage concrete board 2 are removed in sequence, so that the first phase change energy storage concrete board 1 is retained on one side of the cast-in-place concrete.

[0030] In order to make the structure more solid, the fireproof board 3 and the heat-insulating board 4 are bonded by adhesive, and the heat-insulating board 4 and the solar cell panel 5 are bonded by adhesive. The adhesive in this embodiment is acrylic resin adhesive.

[0031] Specifically, the first phase-change energy storage concrete board 1 and the second phase-change energy storage concrete board 2 are both fly ash ceramsite paraffin boards. The fly ash ceramsite paraffin boards use paraffin as the phase change material, add some graphite to the paraffin, and use fly ash ceramsite as a carrier to absorb the paraffin. In order to prevent the liquid from flowing out during the phase change of the paraffin, epoxy resin is used for packaging. The fly ash ceramsite after the paraffin is adsorbed is used as a coarse aggregate, and then water, cement and sand are added and stirred evenly to obtain a phase-change energy storage concrete board. By selecting different types of paraffin, the melting point of the phase change material of the first phase-change energy storage concrete board 1 is higher than the melting point of the phase change material of the second phase-change energy storage concrete board 2.

[0032] Fly ash ceramsite paraffin board can transfer heat directly to cast-in-place concrete. Paraffin is low in price, widely available, non-corrosive and non-toxic. Its melting point is between 30-90°C and its phase change enthalpy is between 180-230J / g. Fly ash ceramsite is low in price and is a porous medium with good adsorption effect on paraffin. In order to improve the thermal stability of paraffin, graphite can be added to the paraffin, and then ceramsite is used as coarse aggregate to prepare phase change energy storage concrete, which is light in weight and has good performance.

[0033] Specifically, the fireproof board 3 is a fireproof graphite polystyrene board. The fireproof graphite polystyrene board has higher thermal insulation capacity and lower thermal conductivity coefficient. Its fireproof performance reaches Class B flame retardant grade, which can prevent the electric heating belt 7 from causing fire and improve safety. At the same time, it has good thermal insulation performance, can prevent heat loss during the phase change process, and can also absorb sound and reduce noise, thereby saving resources and protecting the environment.

[0034] On the one hand, the insulation board 4 can prevent the heat loss of the phase change insulation unit, and on the other hand, it can improve the structural strength of the maintenance device in this embodiment, so that it can be used as a template. Specifically, the insulation board 4 is a nylon asbestos composite board. Nylon, as a structural material, has the characteristics of high strength and good heat resistance. Nylon varieties such as PA46 and PA12 have a strong price advantage; asbestos has high fire resistance, electrical insulation and thermal insulation, and is an important fireproof, insulating and thermal insulation material. Asbestos fiber has a good reinforcing effect on nylon materials. The composite board made by mixing the two raw materials in a certain proportion makes the product quality more stable.

[0035] The solar panel 5 absorbs light energy during the day and converts the light energy into electrical energy to supply power to the electric heating cable 7 (24V voltage), so that the phase change material stores heat through phase change, and the excess electrical energy is stored in the solar panel 5, thereby making full use of solar energy and being more energy-saving and environmentally friendly.

[0036] Specifically, the first temperature sensing component is a first temperature sensor, the second temperature sensing component is a second temperature sensor, and the third temperature sensing component is a third temperature sensor.

[0037] The present embodiment also provides a maintenance method based on the maintenance device 100 for ordinary concrete walls in cold regions, comprising the following steps: the maintenance device 100 for ordinary concrete walls in cold regions in the present embodiment is set up at a construction site, and the same support method as that of a traditional formwork is adopted; cast-in-place concrete is poured on a side of the first phase change energy storage concrete slab 1 away from the second phase change energy storage concrete slab 2; a first temperature sensing component is set in the first phase change energy storage concrete slab 1, a second temperature sensing component is set on the surface of the cast-in-place concrete, and a third temperature sensing component is set in the center of the cast-in-place concrete. When the third temperature sensing component detects that the temperature is lower than 10°C, the thermostat controls the solar panel 5 to energize the electric heating belt 7. When the first temperature sensing component detects that the temperature reaches the melting point of the phase change material of the first phase change energy storage concrete board 1, the thermostat controls the solar panel 5 to de-energize the electric heating belt 7. The electric heating belt 7 repeats the phase change of the first phase change energy storage concrete board 1 and the second phase change energy storage concrete board 2 by repeatedly switching on and off. After the power is cut off, the temperature is reduced, so that the first phase change energy storage concrete board 1 and the second phase change energy storage concrete board 2 are cured and release heat, which is used to cure the cast-in-place concrete. During the curing process, a temperature-time relationship curve is established according to the temperature measured by the third temperature sensing component, and then the maturity formula is used to measure the strength of the cast-in-place concrete. When the strength of the cast-in-place concrete reaches the critical strength value of the concrete being frozen, the electric heating curing is stopped, thereby shortening the construction period to a greater extent. Specifically, the maturity formula is cited based on the "JGJT104-2011 Winter Construction Code for Building Engineering".

[0038] In this embodiment, the curing effect can be judged based on the time T1 for the first phase change energy storage concrete slab 1 and the second phase change energy storage concrete slab 2 to store heat when the electric heating belt 7 is powered on, the heat release time T2 for the first phase change energy storage concrete slab 1 and the second phase change energy storage concrete slab 2, and the time T3 required for the central temperature of the cast-in-place concrete to drop to 10°C, combined with T1, and whether the sum of T2+T3 is less than 12h. Ensure that the electric energy stored in the solar panel 5 during the day can meet the normal phase change process of the phase change material at night, and ensure that the electric heating belt 7 can automatically power on during the day and at night, so as to avoid the phenomenon of workers manually powering on the electric heating belt 7 at night.

[0039] The present specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A maintenance device for ordinary concrete walls in cold regions, characterized in that: The invention comprises a first phase-change energy storage concrete board, a second phase-change energy storage concrete board, a fireproof board, a heat-insulating board, a solar panel, a connecting assembly, a first temperature sensing component, a second temperature sensing component, a third temperature sensing component, a thermostat and a plurality of electric heating belts, wherein the first phase-change energy storage concrete board, the second phase-change energy storage concrete board, the fireproof board, the heat-insulating board and the solar panel are sequentially connected through the connecting assembly, the first phase-change energy storage concrete board is used to be close to the cast-in-place concrete, a plurality of the electric heating belts are embedded in the surface of the second phase-change energy storage concrete board, the electric heating belts are connected to the solar panel, the first temperature sensing component is arranged in the first phase-change energy storage concrete board, and the second The temperature sensing component is used to be arranged on the surface of the cast-in-place concrete, the third temperature sensing component is used to be arranged in the cast-in-place concrete, the electric heating tape, the solar cell panel, the first temperature sensing component, the second temperature sensing component and the third temperature sensing component are all connected to the thermostat; the second phase change energy storage concrete board is provided with a plurality of strip grooves on one side close to the first phase change energy storage concrete board and on the other side close to the fireproof board, and one of the electric heating tapes is installed in each of the strip grooves; the melting point of the phase change material of the first phase change energy storage concrete board is higher than the melting point of the phase change material of the second phase change energy storage concrete board, and the first phase change energy storage concrete board is also used as a thermal insulation decorative board.

2. The maintenance device for ordinary concrete walls in cold regions according to claim 1 is characterized in that: The connecting assembly includes a plurality of bolts and a plurality of nuts, each of the bolts sequentially passes through the first phase change energy storage concrete board, the second phase change energy storage concrete board, the fireproof board, the insulation board and the solar panel, and the nut is installed at one end of the bolt extending from the solar panel.

3. The maintenance device for ordinary concrete walls in cold regions according to claim 2 is characterized in that: The fireproof board and the heat-insulating board are bonded together by adhesive, and the heat-insulating board and the solar cell panel are bonded together by adhesive.

4. The maintenance device for ordinary concrete walls in cold regions according to claim 3 is characterized in that: The adhesive is an acrylic resin adhesive.

5. The maintenance device for ordinary concrete walls in cold regions according to claim 1 is characterized in that: The first phase-change energy storage concrete board and the second phase-change energy storage concrete board are both fly ash ceramsite paraffin boards, the fireproof board is a fireproof graphite polystyrene board, and the thermal insulation board is a nylon asbestos composite board.

6. The maintenance device for ordinary concrete walls in cold regions according to claim 1 is characterized in that: The first temperature sensing component is a first temperature sensor, the second temperature sensing component is a second temperature sensor, and the third temperature sensing component is a third temperature sensor.

7. A maintenance method for a maintenance device for ordinary concrete walls in cold regions based on any one of claims 1 to 6, characterized in that: The method comprises the following steps: setting up the maintenance device for ordinary concrete walls in cold regions at a construction site, pouring the cast-in-place concrete on the side of the first phase-change energy storage concrete slab away from the second phase-change energy storage concrete slab, arranging the first temperature sensing component in the first phase-change energy storage concrete slab, arranging the second temperature sensing component on the surface of the cast-in-place concrete, and arranging the third temperature sensing component at the center of the cast-in-place concrete; when the third temperature sensing component detects that the temperature is lower than 10°C, the thermostat controls the solar panel to energize the electric heating belt; when the temperature detected by the first temperature sensing component reaches the melting point of the phase change material of the first phase-change energy storage concrete slab, the thermostat controls the solar panel to de-energize the electric heating belt; during the maintenance process, a temperature-time relationship curve is established according to the temperature measured by the third temperature sensing component, and then the maturity formula is used to measure the strength of the cast-in-place concrete; when the strength of the cast-in-place concrete reaches the critical strength value of concrete freezing, the electric heating maintenance is stopped.

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