Mass concrete winter construction crack control method

Abstract

The invention relates to the technical field, in particular to a mass concrete winter construction crack control method which comprises a construction point used for concrete pouring. The top of the construction point is provided with a supporting framework, the top of the supporting framework is provided with the temperature control component, and the temperature control component is used for concrete curing in winter. According to the method, concrete can still be poured in the cold winter period, and cracks are controlled from the aspect of the concrete mixing proportion; different construction processes are adopted, cracks are controlled, the concrete temperature is monitored to control the cracks, the overall construction progress is not affected, in order to guarantee the construction progress, the concrete pouring quality and the like, a greenhouse temperature method and a film covering and watering maintenance method are adopted, and although the economic benefit does not reach the expected effect, the overall construction progress is not affected. However, after a long time, the method has great social benefits.

Description

Technical Field

[0001] The invention relates to the technical field of building construction crack control, in particular to a method for controlling cracks in large-volume concrete construction in winter. Background Art

[0002] In concrete, sand and stone act as a skeleton, called aggregates; cement and water form cement paste, which wraps around the surface of aggregates and fills their gaps. Before hardening, cement paste acts as a lubricant, giving the mixture a certain workability and facilitating construction. After hardening, cement paste cements aggregates into a solid whole.

[0003] Traditionally, winter concrete pouring generally adopts measures such as covering with thermal insulation materials or stopping concrete pouring during the cold winter to control the quality of concrete. Stopping concrete pouring will affect the overall construction progress. If the concrete is cured by covering with thermal insulation materials, the temperature is difficult to control and cracks are still prone to appear on the concrete surface, affecting the construction quality. Summary of the invention

[0004] To this end, the present invention provides a method for controlling cracks in large-volume concrete during winter construction to solve the above-mentioned problems.

[0005] The present invention provides the following technical solution: a method for controlling cracks in large-volume concrete during winter construction, comprising a construction point, wherein the construction point is used for pouring concrete; A temperature control component is provided on the top of the construction point with a support frame, and a temperature control component is provided on the top of the support frame. The temperature control component is used for the maintenance of concrete in winter.

[0006] As a preferred solution of the present invention, the construction point includes a construction ground, the construction ground is located at the bottom of the support frame, a concrete pump is provided at a non-construction location of the construction ground, a delivery pipe is provided at a non-construction location of the construction ground, a discharge end of the delivery pipe is located at a construction location of the construction ground, a vibrator is provided at the construction location of the construction ground, a trowel is provided at the construction location of the construction ground, and concrete raw materials are poured at the construction location of the construction ground; The temperature control component includes a greenhouse, which covers the surface of the supporting frame, an outside-shed temperature sensor is fixedly provided on the outside of the greenhouse, the contact surface between the concrete raw material and the air is covered with a film, an inside-shed temperature sensor is fixedly provided on the top of the film, the inside-shed temperature sensor is located inside the greenhouse, a monitor is fixedly provided inside the greenhouse, and the output end of the monitor is electrically connected to the receiving ends of the inside-shed temperature sensor and the outside-shed temperature sensor.

[0007] As a preferred solution of the present invention, the output end of the monitor is electrically connected to Bluetooth, the output end of the Bluetooth is electrically connected to a server, the server is internally loaded with temperature difference software, and the output end of the server is electrically connected to an alarm.

[0008] As a preferred solution of the present invention, the components of the concrete raw materials are cement, water, sand, stone, admixtures and admixtures, and the mix ratio of the cement, water, sand, stone, admixtures and admixtures is 238:165:767:1060:8.6:151.

[0009] As a preferred solution of the present invention, the raw material of the cement is low-calorific general-purpose silicate cement, and the cement is suitable for concrete projects in severe cold regions that are subject to repeated freeze-thaw cycles within the range of water level fluctuations.

[0010] As a preferred solution of the present invention, the temperature sensor outside the greenhouse is used to measure the temperature outside the greenhouse, the temperature sensor inside the greenhouse is used to measure the temperature inside the greenhouse, the concrete pump is used to prevent the concrete raw materials from solidifying and to transport the concrete raw materials, the trowel is used to smooth and press the surface of the construction ground after pouring, and the vibrator is used to vibrate the surface of the construction ground after pouring.

[0011] As a preferred solution of the present invention, the monitor is used to collect data collected by the temperature sensor outside the greenhouse and the temperature sensor inside the greenhouse, the Bluetooth is used to transmit the data collected by the monitor, the server is used to store the data transmitted by Bluetooth, the temperature difference software is used to analyze and compare the data stored inside the server, and the alarm is used for alarm operation.

[0012] As a preferred solution of the present invention, the sand content of the concrete raw material is 42%.

[0013] As a preferred solution of the present invention, the water-to-cement ratio of the concrete raw material is 0.44.

[0014] As a preferred solution of the present invention, the specific method for controlling construction cracks on the construction ground is: Cement, water, sand, stone, admixture and admixture are mixed in a mix ratio of 238:165:767:1060:8.6:151 to obtain a mixed concrete raw material. The sand content of the concrete raw material is 42%, which meets the requirements of the specification (38%-45%). The water-binder ratio of the concrete raw material is 0.44, which meets the requirements of the specification (≤0.45). It is concluded that the concrete raw material can be produced. The concrete raw material coagulates and hardens quickly, has high early strength and late strength, and is suitable for concrete with strong requirements, winter construction concrete, high-strength concrete of important structures above and below the ground, and prestressed concrete engineering. Cracks are controlled in terms of the mix ratio of the concrete raw materials, and the construction quality of the construction site on the ground after construction is improved. After the concrete raw materials are mixed, they are poured into the concrete pump, and the concrete raw materials are transported to the construction site on the construction ground through the provided delivery pipe for continuous and orderly pouring. The overall push-type pouring method is adopted during pouring, and the layer thickness of each push is controlled at 300-500mm. After pouring, the concrete raw materials are vibrated once by the provided vibrator, and then smoothed once by the provided trowel. At this time, the concrete raw materials have completed one treatment, and then they are vibrated twice by the provided vibrator, and then smoothed twice by the provided trowel, to ensure that the concrete raw materials are vibrated densely, without shrinkage and sinking cracks on the surface, thereby improving the compactness of the concrete after pouring, and avoiding the possibility of voids inside the concrete raw materials, thereby affecting the construction quality of the concrete raw materials after pouring; After the concrete raw materials are poured, the concrete cannot be watered and cured in winter. In order to meet the curing time requirements, the surface of the concrete raw materials is covered with a film, and then the support frame is placed on the top of the construction site of the construction ground. At this time, the poured concrete raw materials are located inside the support frame, and the greenhouse is covered on the surface of the support frame. The greenhouse method is to set up a support frame around the construction ground, and use the greenhouse to enclose the support frame to form a relatively closed space that can be constructed and operated. The air in the greenhouse is kept at a positive temperature through artificial heating. The production and curing of the concrete raw materials are carried out in the greenhouse, so as to keep the maximum temperature difference between the concrete surface temperature and the ambient temperature within 20°. By artificially laying the film after the initial setting and before the final setting of the concrete raw materials, the film and the surface of the concrete raw materials are closely combined, which promotes the hydration effect of the concrete raw materials and plays a significant role in preventing cracks and moisturizing during the curing process of the concrete raw materials. After the above construction is completed, start real-time monitoring of the temperature in the greenhouse. First, measure the temperature of the outside environment through the temperature sensor outside the greenhouse, and then measure the temperature of the inside environment through the temperature sensor inside the greenhouse. The data is transmitted to the monitor to complete the data statistics, and then the data transmitted by the monitor is transmitted to the server through Bluetooth. The temperature is compared through the temperature difference software. When the temperature rise value is ≤50°, the temperature difference between the inside and outside is not more than 25°, the temperature difference between the surface and the atmosphere is not more than 20°, and the cooling rate is controlled at 2° / d, it is in normal state. When the data is greater than the above range, the server controls the alarm to sound, which realizes real-time monitoring while reducing the waste of human resources. The construction team does not need to set up a special monitoring team, which is convenient for the maintenance of concrete raw materials.

[0015] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, concrete pouring operations can still be carried out during the cold winter period by controlling the cracks from the aspect of concrete mix ratio; and adopting different construction processes to control the cracks and monitor the concrete temperature to control the cracks, which will not affect the overall construction progress. In order to ensure the construction progress and the quality of concrete pouring, the greenhouse temperature method plus the film covering and watering maintenance method are adopted. Although the economic benefits have not achieved the expected results, it will have a great effect on social benefits in the long run. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the proportion of concrete raw materials in the present invention; Figure 3 It is the concrete pouring construction flow chart of the present invention; Figure 4 It is the temperature monitoring flow chart of the present invention.

[0017] In the figure: 1. Construction point; 2. Temperature control components; 3. Support frame; 4. Concrete pump; 5. Delivery pipe; 6. Vibrator; 7. Trowel; 101. Concrete raw materials; 102. Covering; 103. Construction ground; 201. Greenhouse; 202. Temperature sensor outside the greenhouse; 203. Temperature sensor inside the greenhouse; 204. Monitor; 205. Bluetooth; 206. Server; 207. Temperature difference software; 208. Alarm; 10101. Cement; 10102. Water; 10103. Sand; 10104. Stone; 10105. Admixture; 10106. Admixture. DETAILED DESCRIPTION

[0018] 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.

[0019] See also Figure 1-4 The technical solution provided by the present invention specifically includes the following embodiments: Embodiment: A method for controlling cracks in large-volume concrete construction in winter, comprising a construction site 1, the construction site 1 being used for pouring concrete; Temperature control component 2, a support frame 3 is provided on the top of the construction point 1, and a temperature control component 2 is provided on the top of the support frame 3. The temperature control component 2 is used for curing concrete in winter.

[0020] Specifically, the construction site 1 includes a construction ground 103, the construction ground 103 is located at the bottom of the support frame 3, a concrete pump 4 is provided at the non-construction part of the construction ground 103, a conveying pipe 5 is provided at the non-construction part of the construction ground 103, the discharge end of the conveying pipe 5 is located at the construction part of the construction ground 103, a vibrator 6 is provided at the construction part of the construction ground 103, a trowel 7 is provided at the construction part of the construction ground 103, and concrete raw materials 101 are poured at the construction part of the construction ground 103; The trowel 7 is a machine for rough and fine troweling of concrete surface. The surface constructed by the machine is smoother and flatter than the surface constructed by manual labor, which can greatly improve the density and wear resistance of the concrete surface, and improve the work efficiency by more than 10 times compared with manual labor, thereby improving the construction efficiency; The concrete pump 4 is a hydraulic transmission concrete pump, which is composed of a hopper, a hydraulic cylinder and a piston, a concrete cylinder, a distribution valve, a Y-shaped pipe, a flushing device, a hydraulic system and a power system. The hydraulic system pushes the piston to reciprocate through pressure, and the piston sucks the material when it moves backward, and presses the concrete in the concrete cylinder into the delivery pipe 5 through the Y-shaped pipe when it pushes forward; The vibrator 6 is a surface vibrator. It is placed directly on the concrete surface. The vibration waves generated by the surface vibrator are transmitted to the concrete through the vibrating bottom plate fixed to it. Since the vibration waves are transmitted from the concrete surface, it is called a surface vibrator. When working, two people hold the handle of the vibrator and drag it according to the work needs to make the concrete densely combined and eliminate the honeycomb and pockmarked surface of the concrete, so as to improve its strength and ensure the quality of the concrete components. The support frame 3 is located at the top of the construction ground 103, and the bases on both sides of the support frame 3 are located at the top of the non-construction area of ​​the construction ground 103, so that the support frame 3 can complete the coverage of the construction area of ​​the construction ground 103 without affecting the pouring of concrete raw materials 101 at the construction area of ​​the construction ground 103.

[0021] The temperature control component 2 includes a greenhouse 201, which is covered on the surface of the supporting frame 3. An external greenhouse temperature sensor 202 is fixedly provided on the outside of the greenhouse 201. The contact surface of the concrete raw material 101 with the air is covered with a coating 102. An internal greenhouse temperature sensor 203 is fixedly provided above the coating 102. The internal greenhouse temperature sensor 203 is located inside the greenhouse 201. A monitor 204 is fixedly provided inside the greenhouse 201. The output end of the monitor 204 is electrically connected to the internal greenhouse temperature sensor 203 and the receiving end of the external greenhouse temperature sensor 202. The external greenhouse temperature sensor 202 is used to measure the temperature outside the greenhouse 201. The internal greenhouse temperature sensor 203 is used to measure the temperature inside the greenhouse 201. The concrete pump 4 is used to prevent the concrete raw material 101 from condensing and to transport the concrete raw material 101. The trowel 7 is used to smooth and press the surface of the construction ground 103 after pouring. The vibrator 6 is used to vibrate the surface of the construction ground 103 after pouring. The support frame 3 is fixed to the construction ground 103 by bolts; The material of the greenhouse 201 is a curing film. By manually laying the covering film 102 after the initial setting and before the final setting of the concrete raw material 101, the covering film 102 is tightly combined with the surface of the concrete raw material 101, which promotes the hydration effect of the concrete raw material 101 and plays a significant role in preventing cracking and moisturizing during the curing process of the concrete raw material 101.

[0022] The output end of the monitor 204 is electrically connected to the Bluetooth 205, the output end of the Bluetooth 205 is electrically connected to the server 206, the server 206 is internally loaded with the temperature difference software 207, the output end of the server 206 is electrically connected to the alarm 208, the monitor 204 is used to collect data collected by the temperature sensor 202 outside the shed and the temperature sensor 203 inside the shed, the Bluetooth 205 is used to transmit the data collected by the monitor 204, the server 206 is used to store the data transmitted by the Bluetooth 205, the temperature difference software 207 is used to analyze and compare the data stored in the server 206, and the alarm 208 is used for alarm operation; Bluetooth 205 is an open global specification for wireless data and voice communications. It is a special short-range wireless technology connection based on low-cost short-range wireless connection to establish a communication environment for fixed and mobile devices. Interconnection through Bluetooth 205 can realize the transmission of data collected by the monitor 204; The temperature sensor 202 outside the greenhouse and the temperature sensor 203 inside the greenhouse are both infrared temperature sensors. Thermal sensors use the radiation heat effect to cause the temperature of the detection device to rise after receiving radiation energy, thereby causing changes in the temperature-dependent properties of the sensor. By detecting changes in any of the properties, radiation can be detected. In most cases, radiation is detected through the Seebeck effect. When the device receives radiation, it causes a physical change in a non-electrical quantity, which can also be converted into an electrical quantity through appropriate changes for measurement, thereby completing the measurement of temperature.

[0023] The components of the concrete raw material 101 are cement 10101, water 10102, sand 10103, stone 10104, admixture 10105 and admixture 10106. The mix ratio of cement 10101, water 10102, sand 10103, stone 10104, admixture 10105 and admixture 10106 is 238:165:767:1060:8.6:151. The raw material of cement 10101 is low-calorific general-purpose silicate cement. Cement 10101 is suitable for concrete projects that are subjected to repeated freeze-thaw cycles within the range of water level rise and fall in severe cold areas. The sand content of the concrete raw material 101 is 42%, and the water-cement ratio of the concrete raw material 101 is 0.44. The mixed concrete raw material 101 is obtained by mixing cement 10101, water 10102, sand 10103, stone 10104, admixture 10105 and admixture 10106 in a mix ratio of 238:165:767:1060:8.6:151. The sand content of the concrete raw material 101 is 42%, which meets the specification requirement of 38%-45%. The water-binder ratio of the concrete raw material 101 is 0.44, which meets the specification requirement of ≤0.45. It is concluded that the concrete raw material 101 can be produced, and the concrete raw material 101 sets and hardens quickly, has high early strength and late strength, is suitable for concrete with strong requirements, winter construction concrete, high-strength concrete of important structures above and below the ground, and prestressed concrete engineering. The cracks are controlled in the mix ratio of the concrete raw material 101, and the construction quality of the construction site of the construction ground 103 after construction is improved. After the concrete raw material 101 is mixed, it is poured into the concrete pump 4, and the concrete raw material 101 is transported to the construction site of the construction ground 103 through the provided delivery pipe 5 for continuous and orderly pouring. The integral push-type pouring method is adopted during pouring, and the layer thickness of each push is controlled at 300-500mm. After pouring, the concrete raw material 101 is vibrated once by the provided vibrator 6, and then is smoothed once by the provided trowel 7. At this time, the concrete raw material 101 completes one treatment, and then is vibrated twice by the provided vibrator 6, and then is smoothed twice by the provided trowel 7, to ensure that the concrete raw material 101 is vibrated and compacted, and there is no shrinkage or sinking cracks on the surface, thereby improving the compactness of the concrete after pouring, and avoiding the possibility of voids inside the concrete raw material 101, thereby affecting the construction quality of the concrete raw material 101 after pouring; After the concrete raw material 101 is poured, it is constructed in winter and the concrete cannot be watered for curing. In order to meet the curing time requirements, the coating 102 is covered on the surface of the concrete raw material 101, and then the support frame 3 is placed on the top of the construction site of the construction ground 103. At this time, the poured concrete raw material 101 is located inside the support frame 3, and the greenhouse 201 is covered on the surface of the support frame 3. The greenhouse method is to set up the support frame 3 around the construction ground 103, and use the greenhouse 201 to enclose the support frame 3 to form a relatively closed space that can be constructed and operated. The air in the greenhouse is kept at a positive temperature through artificial heating. The production and curing of the concrete raw material 101 are both carried out in the greenhouse, so as to keep the maximum temperature difference between the concrete surface temperature and the ambient temperature within 20°. By artificially laying the coating 102 after the initial setting and before the final setting of the concrete raw material 101, the coating 102 and the surface of the concrete raw material 101 are closely combined, which promotes the hydration effect of the concrete raw material 101 and plays a significant role in preventing cracks and moisturizing during the curing process of the concrete raw material 101. After the above construction is completed, the real-time monitoring of the temperature in the greenhouse 201 is started. First, the temperature of the environment outside the greenhouse is measured by the temperature sensor 202 outside the greenhouse, and then the temperature of the environment inside the greenhouse is measured by the temperature sensor 203 inside the greenhouse. The data is transmitted to the monitor 204 to complete the data statistics, and then the data transmitted by the monitor 204 is transmitted to the server 206 through Bluetooth 205. The temperature is compared through the temperature difference software 207. When the temperature rise value is ≤50°, the temperature difference between the inside and outside is not greater than 25°, the temperature difference between the surface and the atmosphere is not greater than 20°, and the cooling rate is controlled at 2° / d, it is in a normal state. When the data is greater than the above range, the server 206 controls the alarm 208 to alarm, which realizes real-time monitoring while reducing the waste of human resources. The construction team does not need to set up a special monitoring team, which is convenient for the maintenance of concrete raw materials 101.

[0024] The present invention is a method for controlling cracks in winter construction of large-volume concrete. When working, cement 10101, water 10102, sand 10103, stone 10104, admixture 10105 and admixture 10106 are mixed in a proportion of 238:165:767:1060:8.6:151 to obtain a mixed concrete raw material 101. The sand content of the concrete raw material 101 is 42%, which meets the standard requirement of 38%-45%. The water-cement ratio of the concrete raw material 101 is 0.44, which meets the standard requirement of ≤0.45. It is concluded that the concrete raw material 101 can be produced. The concrete raw material 101 sets and hardens quickly, and has high early strength and late strength. It is suitable for concrete with strong requirements, winter construction concrete, high-strength concrete of important structures above and below the ground, and prestressed concrete engineering. The cracks are controlled in terms of the proportion of the concrete raw material 101, and the construction quality of the construction site of the construction ground 103 after construction is improved. After the concrete raw material 101 is mixed, it is poured into the concrete pump 4, and the concrete raw material 101 is transported to the construction site of the construction ground 103 through the provided delivery pipe 5 for continuous and orderly pouring. The integral push-type pouring method is adopted during pouring, and the layer thickness of each push is controlled at 300-500mm. After pouring, the concrete raw material 101 is vibrated once by the provided vibrator 6, and then is smoothed once by the provided trowel 7. At this time, the concrete raw material 101 completes one treatment, and then is vibrated twice by the provided vibrator 6, and then is smoothed twice by the provided trowel 7, to ensure that the concrete raw material 101 is vibrated and compacted, and there is no shrinkage or sinking cracks on the surface, thereby improving the compactness of the concrete after pouring, and avoiding the possibility of voids inside the concrete raw material 101, thereby affecting the construction quality of the concrete raw material 101 after pouring; After the concrete raw material 101 is poured, it is constructed in winter and the concrete cannot be watered for curing. In order to meet the curing time requirements, the coating 102 is covered on the surface of the concrete raw material 101, and then the support frame 3 is placed on the top of the construction site of the construction ground 103. At this time, the poured concrete raw material 101 is located inside the support frame 3, and the greenhouse 201 is covered on the surface of the support frame 3. The greenhouse method is to set up the support frame 3 around the construction ground 103, and use the greenhouse 201 to enclose the support frame 3 to form a relatively closed space that can be constructed and operated. The air in the greenhouse is kept at a positive temperature through artificial heating. The production and curing of the concrete raw material 101 are both carried out in the greenhouse, so as to keep the maximum temperature difference between the concrete surface temperature and the ambient temperature within 20°. By artificially laying the coating 102 after the initial setting and before the final setting of the concrete raw material 101, the coating 102 and the surface of the concrete raw material 101 are closely combined, which promotes the hydration effect of the concrete raw material 101 and plays a significant role in preventing cracks and moisturizing during the curing process of the concrete raw material 101. After the above construction is completed, the real-time monitoring of the temperature in the greenhouse 201 is started. First, the temperature of the environment outside the greenhouse is measured by the temperature sensor 202 outside the greenhouse, and then the temperature of the environment inside the greenhouse is measured by the temperature sensor 203 inside the greenhouse. The data is transmitted to the monitor 204 to complete the data statistics, and then the data transmitted by the monitor 204 is transmitted to the server 206 through Bluetooth 205. The temperature is compared through the temperature difference software 207. When the temperature rise value is ≤50°, the temperature difference between the inside and outside is not greater than 25°, the temperature difference between the surface and the atmosphere is not greater than 20°, and the cooling rate is controlled at 2° / d, it is in a normal state. When the data is greater than the above range, the server 206 controls the alarm 208 to alarm, which realizes real-time monitoring while reducing the waste of human resources. The construction team does not need to set up a special monitoring team, which is convenient for the maintenance of concrete raw materials 101.

[0025] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A method for controlling cracks in large-volume concrete during winter construction, characterized in that: It comprises a construction point (1), wherein the construction point (1) is used for pouring concrete; A temperature control component (2); a support frame (3) is provided on the top of the construction point (1); a temperature control component (2) is provided on the top of the support frame (3); and the temperature control component (2) is used for curing concrete in winter.

2. A method for controlling cracks in mass concrete during winter construction according to claim 1, characterized in that: The construction site (1) comprises a construction ground (103), the construction ground (103) being located at the bottom of the support frame (3), a concrete pump (4) being provided at a non-construction location of the construction ground (103), a conveying pipe (5) being provided at a non-construction location of the construction ground (103), a discharge end of the conveying pipe (5) being located at a construction location of the construction ground (103), a vibrator (6) being provided at a construction location of the construction ground (103), a trowel (7) being provided at a construction location of the construction ground (103), and concrete raw materials (101) being poured at the construction location of the construction ground (103); The temperature control component (2) comprises a greenhouse (201), the greenhouse (201) covers the surface of the support frame (3), an outside-shed temperature sensor (202) is fixedly provided on the outside of the greenhouse (201), a contact surface of the concrete raw material (101) with the air is covered with a coating (102), an inside-shed temperature sensor (203) is fixedly provided above the coating (102), the inside-shed temperature sensor (203) is located inside the greenhouse (201), a monitor (204) is fixedly provided inside the greenhouse (201), and an output end of the monitor (204) is electrically connected to a receiving end of the inside-shed temperature sensor (203) and an outside-shed temperature sensor (202).

3. A method for controlling cracks in mass concrete during winter construction according to claim 2, characterized in that: The output end of the monitor (204) is electrically connected to Bluetooth (205), the output end of the Bluetooth (205) is electrically connected to a server (206), the server (206) is internally loaded with temperature difference software (207), and the output end of the server (206) is electrically connected to an alarm (208).

4. A method for controlling cracks in mass concrete during winter construction according to claim 2, characterized in that: The concrete raw material (101) comprises cement (10101), water (10102), sand (10103), stone (10104), admixture (10105) and admixture (10106), and the mix ratio of the cement (10101), water (10102), sand (10103), stone (10104), admixture (10105) and admixture (10106) is 238:165:767:1060:8.6:

151.

5. A method for controlling cracks in mass concrete during winter construction according to claim 4, characterized in that: The raw material of the cement (10101) is low-calorific general-purpose silicate cement. The cement (10101) is suitable for concrete projects that are subjected to repeated freeze-thaw cycles within the range of water level fluctuation in severe cold regions.

6. A method for controlling cracks in mass concrete during winter construction according to claim 2, characterized in that: The outside-shed temperature sensor (202) is used to measure the temperature outside the shed (201); the inside-shed temperature sensor (203) is used to measure the temperature inside the shed (201); the concrete pump (4) is used to prevent the concrete raw material (101) from condensing and to transport the concrete raw material (101); the trowel (7) is used to smooth and press the surface of the construction ground (103) after pouring; and the vibrator (6) is used to vibrate the surface of the construction ground (103) after pouring.

7. A method for controlling cracks in mass concrete during winter construction according to claim 3, characterized in that: The monitor (204) is used to collect data collected by the temperature sensor (202) outside the greenhouse and the temperature sensor (203) inside the greenhouse; the Bluetooth (205) is used to transmit the data collected by the monitor (204); the server (206) is used to store the data transmitted by the Bluetooth (205); the temperature difference software (207) is used to analyze the data stored in the server (206) and perform comparison; and the alarm (208) is used for alarm operation.

8. A method for controlling cracks in mass concrete during winter construction according to claim 4, characterized in that: The sand content of the concrete raw material (101) is 42%.

9. A method for controlling cracks in mass concrete during winter construction according to claim 4, characterized in that: The water-to-binder ratio of the concrete raw material (101) is 0.

44.

10. A method for controlling cracks in mass concrete during winter construction according to any one of claims 1 to 9, characterized in that: The specific method for controlling the construction cracks at the construction ground (103) is: Cement (10101), water (10102), sand (10103), stone (10104), admixture (10105) and admixture (10106) are mixed in a mix ratio of 238:165:767:1060:8.6:151 to obtain a mixed concrete raw material (101). The sand content of the concrete raw material (101) is 42%, which meets the requirements of the specification (38%-45%). The water-binder ratio of the concrete raw material (101) is 0.44, which meets the requirements of the specification (≤0.45). It can be concluded that the concrete raw material (101) can be produced. The concrete raw material (101) sets and hardens quickly, has high early strength and late strength, and is suitable for concrete with strong requirements, winter construction concrete, high-strength concrete of important above-ground and underground structures, and prestressed concrete engineering. Cracks are controlled in the mix ratio of the concrete raw material (101), thereby improving the construction quality of the construction site of the construction ground (103) after construction. After the concrete raw materials (101) are mixed, they are poured into a concrete pump (4), and the concrete raw materials (101) are transported to a construction site on a construction ground (103) through a provided transport pipe (5) for continuous and orderly pouring. During pouring, an integral push-type pouring method is adopted, and the layer thickness of each push is controlled to be 300-500 mm. After pouring, the concrete raw materials (101) are vibrated once by a provided vibrator (6), and then smoothed once by a provided trowel (7). At this time, the concrete raw materials (101) have completed a first treatment, and then they are vibrated twice by the provided vibrator (6), and then smoothed twice by the provided trowel (7), so as to ensure that the concrete raw materials (101) are vibrated and compacted, and the surface has no shrinkage or subsidence cracks, thereby improving the compactness of the concrete after pouring, and avoiding the occurrence of voids inside the concrete raw materials (101), thereby affecting the construction quality of the concrete raw materials (101) after pouring; After the concrete raw material (101) is poured, the concrete cannot be watered for curing in winter. In order to meet the curing time requirement, the covering film (102) is covered on the surface of the concrete raw material (101), and then the support frame (3) is placed on the top of the construction site of the construction ground (103). At this time, the poured concrete raw material (101) is located inside the support frame (3), and the greenhouse (201) is covered on the surface of the support frame (3). The greenhouse method is to set up the support frame (3) around the construction ground (103), and use the greenhouse (201) to enclose the support frame (3) to form a A relatively closed space capable of construction operations is formed, and the air in the shed is kept at a positive temperature by artificial heating. The production and curing of the concrete raw material (101) are both carried out in the shed, so that the maximum temperature difference between the surface temperature of the concrete and the ambient temperature is controlled within 20°. The covering film (102) is artificially laid after the initial setting and before the final setting of the concrete raw material (101), so that the covering film (102) and the surface of the concrete raw material (101) are closely combined, and the hydration effect of the concrete raw material (101) is promoted, which plays a significant role in preventing cracks and moisturizing the concrete raw material (101) during the curing process. After the above construction is completed, the real-time monitoring of the temperature in the greenhouse (201) is started. First, the temperature of the environment outside the greenhouse is measured by the temperature sensor outside the greenhouse (202), and then the temperature of the environment inside the greenhouse is measured by the temperature sensor inside the greenhouse (203). The data is transmitted to the monitor (204) to complete the data statistics. Then, the data transmitted by the monitor (204) is transmitted to the server (206) through Bluetooth (205). The temperature is compared through the temperature difference software (207). When the temperature rise value is ≤50°, the temperature difference between the inside and outside is not greater than 25°, the temperature difference between the surface and the atmosphere is not greater than 20°, and the cooling rate is controlled at 2° / d, it is in a normal state. When the data is greater than the above range, the server (206) controls the alarm (208) to sound an alarm, thereby realizing real-time monitoring and reducing the waste of human resources. The construction team does not need to set up a monitoring team, which is convenient for the maintenance of concrete raw materials (101).

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