Bridge bearing platform mass concrete intelligent temperature control system and method

Abstract

The invention provides an intelligent temperature control system and method for mass concrete of a bridge bearing platform, and the system comprises a water treatment device which is used for treating pumped water at a construction site of the bridge bearing platform; the temperature acquisition device is used for acquiring temperature data detected by the temperature sensor; the system master control device is used for receiving the temperature data and regulating and controlling the water treatment device; the wireless communication device is used for transmitting data received and generated by the system master control device; the cloud platform is used for receiving and storing the data transmitted by the wireless communication device for a user to check and issuing a user instruction; the power supply device is used for supplying power. The system is high in automation and intelligence degree, is high in adaptability to construction site environment and conditions, can improve the temperature collection and regulation efficiency of the mass concrete structure of the bridge bearing platform under the condition of saving the manual intervention cost and energy consumption, and achieves the purpose of preventing or reducing the cracking of the mass concrete of the bridge bearing platform.

Description

Technical Field

[0001] The present invention belongs to the technical field of highway bridge engineering, and in particular relates to an intelligent temperature control system and method for large-volume concrete of a bridge cap. Background Art

[0002] According to the definition in the Technical Specifications for Highway Bridge and Culvert Construction (JTG / T 3650-2020), structural concrete with a large volume that may cause harmful cracks due to temperature stress caused by hydration heat of cementitious materials is called mass concrete. As an important part of the bridge structure, the abutment not only bears and distributes the load transmitted by the pier body, but also due to its large volume and large amount of cement, it is easy to generate a large amount of hydration heat during the construction process, resulting in increased temperature stress and harmful cracks. Therefore, the construction of bridge abutments belongs to mass concrete engineering. Since concrete is a poor conductor of heat, heat accumulates inside the concrete of the bridge abutment and is difficult to dissipate, while the surface dissipates heat quickly, resulting in a large temperature difference between the inside and the surface, which in turn generates large temperature stress, causing cracks in the concrete or even through cracks. Cracks not only affect the appearance quality of the bridge, but also lead to a decrease in the bearing capacity of the bridge, seriously threatening the structural safety and traffic safety of the bridge.

[0003] In order to prevent or reduce the occurrence of cracks, cooling water pipes are usually arranged inside the cap and cooling water is introduced to reduce the temperature difference between the inside and the surface of the concrete. In actual engineering, this is mainly achieved by adjusting the temperature and flow rate of the cooling water. However, the temperature control of concrete at the construction site of the bridge cap generally relies on manual control, which makes it difficult to timely detect that the concrete temperature has reached the warning threshold during nighttime and other periods, and to take corresponding adjustment measures. In addition, the feedback process from the monitoring party discovering the alarm to the construction party and on-site personnel taking action is lengthy and complicated, which often leads to missing the best time for regulation. Therefore, the current manually controlled large-volume concrete temperature control system has problems such as low automation and intelligence, slow response, etc., making it difficult to achieve timely, fast and effective temperature control measures for large-volume concrete on bridge caps.

[0004] In the prior art, there is a method for intelligently controlling the temperature of large-volume concrete. The method adopts an intelligent control device to dynamically adjust the temperature, flow rate and flow direction of circulating water in real time according to the temperature change inside the concrete, thereby realizing intelligent, dynamic and efficient control of the temperature of concrete. In order to realize the real-time dynamic adjustment of the temperature of circulating water, a circulating water temperature regulator is used to directly control the temperature of circulating water flowing out of the large-volume concrete structure. The temperature of circulating water flowing out of the large-volume concrete structure is constantly changing. Therefore, the circulating water temperature regulator needs to run continuously to realize the real-time dynamic adjustment of the temperature of circulating water, which requires a lot of energy (such as electrical energy), and the method does not consider how to realize the accuracy of real-time dynamic adjustment of circulating water temperature. In addition, the operation of the intelligent control equipment requires electricity, and the construction period of large-volume concrete projects is relatively long. The method does not consider how to provide a long-term and continuous power supply for the intelligent control equipment at the construction site.

[0005] In addition, the prior art provides an intelligent dynamic temperature control method for concrete, which realizes temperature control by laying out cooling water pipes, measures the real-time temperature of concrete by laying out temperature sensors, distinguishes the state through the temperature collected by the temperature sensors, and provides different temperature control methods to realize dynamic temperature control; wherein, in order to realize dynamic temperature control, a first water tank is provided at the water inlet of the cooling water pipe, and a heating device (electric heating wire) and a cooling device (air cooling device or cold water source) are provided in the first water tank. However, by providing a heating device and a cooling device in the water tank, it is difficult to realize fast and accurate control of the temperature of a large amount of cooling water in the water tank.

[0006] In summary, the existing mass concrete temperature control system still has many shortcomings and needs to be improved. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention provides an intelligent temperature control system and method for large-volume concrete of a bridge pedestal. The system has a high degree of automation and intelligence, and is highly adaptable to the construction site environment and conditions. It can automatically obtain the surface and center temperatures, ambient temperature and cooling water temperature of the large-volume concrete structure of the bridge pedestal, and can quickly and accurately regulate the temperature and flow rate of the cooling water according to different temperature changes. The temperature collection and regulation efficiency of the large-volume concrete structure of the bridge pedestal is improved while saving manual intervention costs and energy consumption, thereby achieving the purpose of preventing or reducing cracking of the large-volume concrete of the bridge pedestal.

[0008] To achieve the above object, the present invention provides the following solutions:

[0009] An intelligent temperature control system for large-volume concrete of a bridge cap, comprising:

[0010] A water treatment plant for treating water extracted from the bridge cap construction site;

[0011] A temperature acquisition device, used to obtain temperature data detected by temperature sensors arranged inside the water treatment device and the large-volume concrete structure of the bridge pier;

[0012] A system master control device, connected to the water treatment device and the temperature acquisition device, for receiving the temperature data and regulating the water treatment device;

[0013] A wireless communication device connected to the system master control device and used for transmitting data received and generated by the system master control device;

[0014] A cloud platform for receiving and storing data transmitted by the wireless communication device for users to view and issuing user instructions;

[0015] A power supply device is used to supply power to the water treatment device, the temperature collection device, the system master control device and the wireless communication device.

[0016] Preferably, the water treatment device comprises:

[0017] The main water pipe is provided with a main water pipe water inlet and a main water pipe water outlet; the main water pipe water outlet is connected with the cooling water pipe water inlet arranged along the height direction of the bridge pier; the main water pipe water inlet is connected with the cooling water pipe water outlet;

[0018] A three-way ball valve is provided with a cooling water inlet, a first cooling water outlet and a second cooling water outlet; wherein the cooling water inlet is connected to one end of the main water pipe water inlet;

[0019] A cold water tank, wherein a refrigerator and a cold water temperature sensor are provided inside, wherein the cold water temperature sensor is used to detect the temperature of cold water in the cold water tank; the cold water tank is connected to the second cooling water outlet through the main water pipe;

[0020] A hot water tank, wherein a heater and a hot water temperature sensor are provided inside, wherein the hot water temperature sensor is used to detect the temperature of hot water in the hot water tank; the hot water tank is connected to the first cooling water outlet through the main water pipe;

[0021] The thermostatic water mixing valve is provided with a cold water inlet, a hot water inlet and a mixed water outlet, and is used to mix and adjust the cold water and hot water so that the temperature of the cooling water flowing out of the mixed water outlet reaches the set value;

[0022] A first variable frequency water pump is arranged on the main water pipe connecting the cold water inlet and the cold water tank;

[0023] A second variable frequency water pump is arranged on the main water pipe connecting the hot water inlet and the hot water tank;

[0024] The constant temperature mixing water valve controls the flow rate of cooling water by interlocking with the first variable frequency water pump and the second variable frequency water pump.

[0025] Preferably, water from the bridge pier construction site is extracted into a cold water tank and a hot water tank, and the method for the water treatment device to process the water extracted from the bridge pier construction site includes: receiving control commands from a cloud platform or a system master control device, controlling the refrigerator in the cold water tank and / or the heater in the hot water tank and a constant temperature mixing valve to achieve regulation of the temperature of the cooling water in the main water pipe; controlling the first variable frequency water pump and / or the second variable frequency water pump and the constant temperature mixing valve to achieve regulation of the flow rate of the cooling water in the main water pipe.

[0026] Preferably, the temperature sensor arranged in the massive concrete structure of the bridge cap includes a concrete surface temperature sensor and a concrete center temperature sensor; wherein the concrete surface temperature sensor is used to collect the temperature of the concrete surface, and the concrete center temperature sensor is used to collect the temperature of the concrete center;

[0027] The temperature sensor also includes an ambient temperature sensor and a cooling water outlet temperature sensor; wherein the ambient temperature sensor is used to collect the ambient temperature of the bridge pedestal construction site, and the cooling water outlet temperature sensor is used to collect the water temperature of the outlet of the cooling water pipe arranged along the height direction of the bridge pedestal.

[0028] Preferably, the system master control device is connected to the three-way ball valve, the refrigerator, the heater, the first variable frequency water pump, the second variable frequency water pump, the constant temperature mixing valve, the temperature collection device and the wireless communication device.

[0029] Preferably, the power supply device adopts a UPS battery, wherein the UPS battery is charged by AC power or solar panels at the construction site.

[0030] The present invention provides a bridge cap mass concrete intelligent temperature control method, using the intelligent temperature control system, including the following steps:

[0031] The system master control device receives the temperature data detected by the concrete center temperature sensor, the concrete surface temperature sensor and the ambient temperature sensor acquired by the temperature acquisition device, and uses the temperature value of the concrete center temperature sensor as the concrete center temperature, the average value of the temperature values ​​of all concrete surface temperature sensors as the concrete surface temperature, and the temperature value of the ambient temperature sensor as the ambient temperature. At the same time, the difference between the concrete center temperature and the concrete surface temperature is used as the concrete inner surface temperature difference;

[0032] The central temperature of the concrete is analyzed by the system master control device, and it is judged whether the mass concrete of the bridge cap is in a heating stage or a cooling stage;

[0033] In the temperature rising stage, the system master control device controls the first variable frequency water pump, the second variable frequency water pump and the constant temperature mixing water valve, so that the temperature of the cooling water flowing out of the mixed water outlet is between the first preset temperature and the second preset temperature, and controls the cooling water flow rate between the first preset flow rate and the second preset flow rate; as the temperature of the concrete rises, if the concrete center temperature received by the system master control device reaches or exceeds the first temperature threshold, or the concrete inner surface temperature difference calculated by the system master control device reaches or exceeds the second temperature threshold, the cooling water flow rate is controlled to increase to the second preset flow rate, and the cooling water temperature is controlled to the first preset temperature; if the cooling water flow rate is increased to the second preset flow rate and the cooling water temperature is controlled to the first preset temperature, the mixing If the temperature difference between the inner and outer surfaces of the concrete still exceeds the second temperature threshold, a temperature warning is issued; wherein, the first preset temperature and the second preset temperature both change with the center temperature of the concrete, and the first preset temperature and the second preset temperature are both lower than the center temperature of the concrete; the first preset temperature is lower than the second preset temperature; the first preset temperature is the center temperature of the concrete minus the first set value, and the preferred value of the first set value is 20°C, and the second preset temperature is the center temperature of the concrete minus the second set value, and the preferred value of the second set value is 15°C; the first temperature threshold is between 65 and 70°C, and the second temperature threshold is between 20 and 25°C; the preferred value of the first preset flow rate is 0.6m / s, and the preferred value of the second preset flow rate is 1.0m / s;

[0034] In the cooling stage, the system master control device calculates the concrete cooling rate according to the concrete center temperature, and controls the cooling water temperature and flow rate according to the concrete center temperature and the concrete cooling rate, so that the cooling water temperature is between the first preset temperature and the third preset temperature, and the concrete cooling rate is not greater than the cooling rate threshold; if the concrete cooling rate reaches or exceeds the cooling rate threshold, the cooling water temperature is controlled to increase between the first preset temperature and the third preset temperature; if the concrete cooling rate still exceeds the cooling rate threshold after the cooling water temperature is increased to the third preset temperature, the cooling water flow rate is controlled to increase to the second preset flow rate; if the concrete cooling rate still exceeds the cooling rate threshold after the cooling water temperature is increased to the third preset temperature and the cooling water flow rate is increased to the second preset flow rate, a temperature warning is issued; wherein the third preset temperature changes with the concrete center temperature, the third preset temperature is greater than the concrete center temperature, the third preset temperature is the concrete center temperature plus the third set value, and the preferred value of the third set value is 20°C; the cooling rate threshold is 2°C / day;

[0035] According to the dynamic temperature control of the massive concrete of the bridge pedestal during the heating stage and the cooling stage, the massive concrete of the bridge pedestal is maintained to the preset requirements and the intelligent temperature control system is turned off; wherein, the preset requirements are: the temperature difference between the inner and outer surfaces of the concrete is not greater than the set temperature difference value, and the difference between the center temperature of the concrete and the ambient temperature is less than the set temperature difference value; the preferred value of the set temperature difference value is 15°C.

[0036] Preferably, judging whether the bridge cap mass concrete is in a heating stage or a cooling stage includes:

[0037] When the average value of the concrete center temperature for a continuous set time is greater than the average value of the previous set time, it is a heating stage, otherwise it is a cooling stage; for example, if the average value of the concrete center temperature for one hour is greater than the average value of the previous hour, it is a heating stage, otherwise it is a cooling stage.

[0038] Preferably, the method further includes: after shutting down the intelligent temperature control system, evacuating the water in the intelligent temperature control system, disconnecting the concrete surface temperature sensor and the concrete center temperature sensor from the temperature acquisition device, discharging the residual water, blowing dry the water pipe, and grouting and sealing the fracture with a micro-expansion mortar or clean slurry with a strength grade not lower than that of the concrete.

[0039] Preferably, during the heating stage, the system master control device controls the first cooling water outlet of the three-way ball valve to be in an open state and the second cooling water outlet to be in a closed state, so that the cooling water flowing out of the cooling water pipe outlet enters the hot water tank through the first cooling water outlet.

[0040] Preferably, during the cooling stage, the system master control device receives temperature data from the cold water temperature sensor and the cooling water outlet temperature sensor. If the temperature value of the cooling water outlet temperature sensor is greater than the temperature value of the cold water temperature sensor, the first cooling water outlet of the three-way ball valve is controlled to be in an open state and the second cooling water outlet is controlled to be in a closed state, so that the cooling water flowing out of the cooling water pipe outlet enters the hot water tank through the first cooling water outlet; if the temperature value of the cooling water outlet temperature sensor is not higher than the temperature value of the cold water temperature sensor, the first cooling water outlet of the three-way ball valve is controlled to be in a closed state and the second cooling water outlet is controlled to be in an open state, so that the cooling water flowing out of the cooling water pipe outlet enters the cold water tank through the second cooling water outlet.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] 1. By setting up a cold water tank and a hot water tank, and using a thermostatic mixing valve to mix and adjust the cold water and hot water, the cooling water temperature can be quickly and accurately controlled without manual control and energy consumption (such as saving electricity to heat the water to the set temperature). At the same time, by setting up a refrigerator and a heater, the cooling water temperature can be automatically controlled to reach the set value under extreme temperature conditions, and it has strong adaptability to the construction site environment;

[0043] 2. By using UPS batteries, the intelligent temperature control system can be prevented from stopping operation due to sudden power outages at the construction site. At the same time, the UPS batteries can be charged using the AC power at the construction site or solar panels, and are highly adaptable to the conditions at the construction site. In addition, charging with solar panels can provide long-term, continuous and stable power supply to the intelligent temperature control system, solving the problem of long-term uninterrupted power supply difficulties for the intelligent temperature control system.

[0044] 3. The intelligent temperature control system for the massive concrete of the bridge pedestal of the present invention has a high degree of automation, and provides a method for controlling the temperature and flow rate of cooling water under different conditions. It has a high degree of intelligence. By adopting the intelligent temperature control system and method for the massive concrete of the bridge pedestal of the present invention, it is possible to automatically adjust the temperature and flow rate of cooling water according to different conditions, thereby achieving timely, rapid and effective control of the temperature of the massive concrete structure of the bridge pedestal, thereby achieving the purpose of preventing or reducing cracking of the massive concrete structure of the bridge pedestal, and at the same time reducing the cost of manual intervention and saving energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments. 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 labor.

[0046] Figure 1 This is a schematic diagram of the intelligent temperature control system for mass concrete of the bridge cap of the present invention;

[0047] Figure 2 This is a schematic diagram of the power supply connection device for the intelligent temperature control system of the bridge cap mass concrete;

[0048] Figure 3 This is a schematic diagram of the layout of cooling water pipes and temperature sensors in the massive concrete structure of the bridge cap;

[0049] Description of the markings in the figure:

[0050] 1-main water pipe, 2-three-way ball valve, 3-cold water tank, 4-hot water tank, 5-first variable frequency water pump, 6-second variable frequency water pump, 7-constant temperature mixing valve, 8-temperature acquisition device, 9-system master control device, 10-wireless communication device, 11-cloud platform, 12-ambient temperature sensor, 13-cooling water outlet temperature sensor, 14-concrete surface temperature sensor, 15-concrete center temperature sensor, 16-power supply device, 17-cooling water pipe, 18-bridge pedestal large-volume concrete structure.

[0051] a1-main water pipe inlet, a2-main water pipe outlet, b1-cooling water pipe inlet, b2-cooling water pipe outlet, 21-cooling water inlet, 22-first cooling water outlet, 23-second cooling water outlet, 31-refrigerator, 32-cold water temperature sensor, 41-heater, 42-hot water temperature sensor, 71-cold water inlet, 72-hot water inlet, 73-mixed water outlet. DETAILED DESCRIPTION

[0052] 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.

[0053] 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.

[0054] Example

[0055] like Figure 1-3 As shown, a bridge pedestal mass concrete intelligent temperature control system includes: a water treatment device, a temperature collection device 8, a system master control device 9, a wireless communication device 10, a cloud platform 11 and a power supply device 16.

[0056] The water treatment device is used to treat the water extracted from the bridge cap construction site and is connected to the cooling water pipe 17 to form a water circulation pipeline; a further embodiment is that the water treatment device includes:

[0057] The main water pipe 1 is provided with a main water pipe water inlet a1 and a main water pipe water outlet a2; wherein one end of the main water pipe water inlet a1 is connected to the cooling water pipe water outlet b2; one end of the main water pipe water outlet a2 is connected to the cooling water pipe water inlet b1;

[0058] The three-way ball valve 2 is provided with a cooling water inlet 21, a first cooling water outlet 22, and a second cooling water outlet 23; wherein the cooling water inlet 21 is connected to the other end of the main water pipe inlet a1; by controlling the opening and closing states of the first cooling water outlet 22 and the second cooling water outlet 23 of the three-way ball valve 2, the cooling water can be controlled to flow out from the first cooling water outlet 22 or the second cooling water outlet 23;

[0059] The cold water tank 3 is provided with a refrigerator 31 and a cold water temperature sensor 32, wherein the cold water temperature sensor 32 is used to detect the temperature of the cold water in the cold water tank 3; the cold water tank 3 is connected with the second cooling water outlet 23 through the main water pipe 1;

[0060] The hot water tank 4 is provided with a heater and a hot water temperature sensor 42, wherein the hot water temperature sensor 42 is used to detect the temperature of the hot water in the hot water tank 4; the hot water tank 4 is connected to the first cooling water outlet 22 through the main water pipe 1;

[0061] The thermostatic water mixing valve 7 is provided with a cold water inlet 71, a hot water inlet 72 and a mixed water outlet 73, and is used to mix and adjust the cold water and the hot water so that the temperature of the cooling water flowing out of the mixed water outlet 73 reaches the set value, and can realize rapid and accurate control of the cooling water temperature without manual control and energy consumption (such as saving electric energy to heat the water to the set temperature);

[0062] The first variable frequency water pump 5 is arranged on the main water pipe 1 connecting the cold water inlet 71 and the cold water tank 3;

[0063] A second variable frequency water pump 6 is provided on the main water pipe 1 connecting the hot water inlet 72 and the hot water tank 4;

[0064] The thermostatic mixing valve 7 controls the flow rate of the cooling water by interlocking with the first variable frequency water pump 5 and the second variable frequency water pump 6 .

[0065] The temperature acquisition device 8 is used to obtain temperature data detected by temperature sensors arranged at the cooling water pipe outlet b2, inside the water treatment device and the large-volume concrete structure 18 of the bridge pedestal; a further implementation method is that the temperature sensor arranged at the cooling water pipe outlet b2 includes a cooling water outlet temperature sensor 13; the temperature sensor arranged in the large-volume concrete structure 18 of the bridge pedestal includes a concrete surface temperature sensor 14 and a concrete center temperature sensor 15; the temperature sensor also includes an ambient temperature sensor 12.

[0066] The temperature acquisition device 8 is connected to the cold water temperature sensor 32 , the hot water temperature sensor 42 , the ambient temperature sensor 12 , the cooling water outlet temperature sensor 13 , the concrete surface temperature sensor 14 and the concrete center temperature sensor 15 .

[0067] The system master control device 9 is connected to the water treatment device and the temperature collection device 8, and is used to receive temperature data and regulate the water treatment device; a further implementation method is that the system master control device 9 is connected to the three-way ball valve 2, the refrigerator 31, the heater 41, the first variable frequency water pump 5, the second variable frequency water pump 6, the constant temperature mixing valve 7, the temperature collection device 8 and the wireless communication device 10, and can not only obtain data from the constant temperature mixing valve 7, the temperature collection device 8 and the wireless communication device 10, but also control the operating status of the three-way ball valve 2, the refrigerator 31, the heater 41, the first variable frequency water pump 5, the second variable frequency water pump 6 and the constant temperature mixing valve 7.

[0068] The wireless communication device 10 is connected to the system master control device 9 and is used for transmitting data received and generated by the system master control device 9 .

[0069] The cloud platform 11 is used to receive and store data transmitted by the wireless communication device 10 for users to view, and to issue user instructions; further, the user can log in to the cloud platform 11 through a mobile phone or a computer to view the data and the operating status of the intelligent temperature control system, and can combine the experience of bridge pier construction monitoring with the actual needs of the project to increase or decrease functions and design interfaces on the cloud platform 11 to realize data visualization functions and early warning mechanisms. At the same time, control instructions can also be input on the cloud platform 11.

[0070] The power supply device 16 is used to supply power to the water treatment device, the temperature collection device 8, the system master control device 9 and the wireless communication device 10; a further implementation method is that the power supply device 16 is connected to the three-way ball valve 2, the refrigerator 31, the heater 41, the first variable frequency water pump 5, the second variable frequency water pump 6, the constant temperature mixing valve 7, the temperature collection device 8, the system master control device 9 and the wireless communication device 10, and the power supply device 16 can provide power supply for the connected equipment and devices; the power supply device 16 can select a UPS (Uninterruptible Power Supply) battery, which can be charged by the AC power of the construction site and by the solar panel. It can also cope with the situation where the intelligent temperature control system stops running due to sudden power outages at the construction site, and has strong adaptability to the conditions of the construction site. In addition, charging with solar panels can realize long-term, continuous and stable power supply to the intelligent temperature control system, solving the problem of difficulty in uninterrupted power supply for the long-term operation of the intelligent temperature control system.

[0071] like Figure 3 As shown, a concrete surface temperature sensor 14, a concrete center temperature sensor 15 and a cooling water pipe 17 are arranged in the massive concrete structure 18 of the bridge cap. There are 8 concrete surface temperature sensors 14, which are symmetrically arranged at the surface positions around the massive concrete structure of the bridge cap; the concrete center temperature sensor 15 is arranged at the center position of the massive concrete structure of the bridge cap. A cooling water pipe inlet b1 is provided at one end of the cooling water pipe 17, and a cooling water pipe outlet b2 is provided at the other end; a cooling water outlet temperature sensor 13 is arranged near the cooling water pipe outlet b2, which is used to detect the outlet temperature of the cooling water flowing out of the cooling water pipe 17.

[0072] On the other hand, the present invention also provides a bridge cap mass concrete intelligent temperature control method, using the above intelligent temperature control system, including the following steps:

[0073] S1. Install cooling water pipes: After the bridge cap reinforcement is installed, arrange one or more layers of cooling water pipes 17 in the height direction of the bridge cap before pouring concrete according to the height of the bridge cap, and fix them on the bridge cap reinforcement; connect the cooling water pipe inlet b1 to the main water pipe outlet a2, and connect the cooling water pipe outlet b2 to the main water pipe inlet a1, so as to form a water circulation pipeline.

[0074] S2. Install temperature sensors: fix the concrete surface temperature sensor 14 and the concrete center temperature sensor 15 on the bridge cap steel bars, and connect them to the temperature acquisition device 8; directly connect the ambient temperature sensor 12 to the temperature acquisition device 8, and place them both in the bridge cap construction site environment to measure the ambient temperature of the construction site.

[0075] S3. Test the intelligent temperature control system: extract water from the bridge pier construction site to the cold water tank 3 and the hot water tank 4, conduct a water flow test on the intelligent temperature control system, check whether the main water pipe 1 and the cooling water pipe 17 are blocked or leaking, and log in to the cloud platform 11 through the mobile phone or computer to check whether the data collection and reception are normal and whether the input control instructions are effectively executed. If problems are found, they will be repaired in time. After the inspection is qualified, the test of the intelligent temperature control system is completed. In this embodiment, check whether the measurement data of each temperature sensor is displayed normally on the cloud platform. If not, it may be that the sensor is not installed correctly and there is a problem. The installation of the sensor needs to be checked; check whether the control instructions input on the cloud platform to control the heater to turn on or off, change the cooling water flow rate, etc. are effectively executed.

[0076] S4. Fill the cooling water pipe 17 with cooling water, and then start pouring the bridge cap mass concrete. When the poured concrete covers the first layer of cooling water pipes, start the intelligent temperature control system to dynamically control the temperature of the bridge cap mass concrete. The specific steps are as follows:

[0077] S41. The system master control device 9 receives the temperature data detected by the concrete center temperature sensor 15, the eight concrete surface temperature sensors 14 and the ambient temperature sensor 12 acquired by the temperature acquisition device 8, and uses the temperature value of the concrete center temperature sensor 15 as the concrete center temperature, the average temperature value of the eight concrete surface temperature sensors 14 as the concrete surface temperature, and the temperature value of the ambient temperature sensor 12 as the ambient temperature. At the same time, the difference between the concrete center temperature and the concrete surface temperature is used as the concrete inner surface temperature difference.

[0078] S42. Analyze the center temperature of concrete through the system master control device 9, and judge whether the massive concrete of the bridge pedestal is in the heating stage or the cooling stage; a further implementation method is that the judgment of whether the massive concrete of the bridge pedestal is in the heating stage or the cooling stage includes: when the average value of the center temperature of concrete for one consecutive hour is greater than the average value of the previous hour, it is the heating stage, otherwise it is the cooling stage.

[0079] S43. In the temperature rising stage, the system master control device 9 controls the first variable frequency water pump 5, the second variable frequency water pump 6 and the constant temperature mixing valve 7, so that the temperature of the cooling water flowing out of the mixed water outlet 73 is between the first preset temperature and the second preset temperature, and controls the cooling water flow rate between the first preset flow rate and the second preset flow rate, so as to prevent the large temperature difference between the large volume concrete of the bridge pier and the cooling water from causing the concrete to crack, and ensure a high cooling efficiency, while saving energy consumption; as the concrete temperature rises, if the concrete center temperature received by the system master control device 9 reaches or exceeds the first temperature threshold, or the system master control device 9 If the calculated temperature difference between the inner surface of the concrete reaches or exceeds the second temperature threshold, the cooling water flow rate is controlled to increase to the second preset flow rate, and the cooling water temperature is controlled to the first preset temperature at the same time to maximize the cooling efficiency; if the cooling water flow rate is increased to the second preset flow rate and the cooling water temperature is controlled to the first preset temperature, the temperature difference between the inner surface of the concrete still exceeds the second temperature threshold, an early warning message is sent to the mobile phone or computer via the cloud platform 11, and thermal insulation measures such as covering the large-volume concrete surface of the bridge pier with thermal insulation materials are manually taken to prevent the concrete surface from dissipating heat too quickly, which may lead to a further increase in the temperature difference between the inner surface of the concrete.

[0080] In the step S43, the first preset temperature and the second preset temperature both vary with the center temperature of the concrete. The first preset temperature can be the center temperature of the concrete minus the first set value of 20°C, and the second preset temperature can be the center temperature of the concrete minus the second set value of 15°C. The first temperature threshold can be between 65 and 70°C, and the second temperature threshold can be between 20 and 25°C. The first preset flow rate can be 0.6 m / s, and the second preset flow rate can be 1.0 m / s.

[0081] S44. In the cooling stage, the system master control device 9 calculates the concrete cooling rate according to the concrete center temperature, and controls the cooling water temperature and flow rate according to the concrete center temperature and the concrete cooling rate, so that the cooling water temperature is between the first preset temperature and the third preset temperature, and the concrete cooling rate is not greater than the cooling rate threshold; if the concrete cooling rate reaches or exceeds the cooling rate threshold, the cooling water temperature is controlled to increase between the first preset temperature and the third preset temperature to reduce the concrete cooling rate and prevent the concrete from cracking due to excessive temperature difference between the cooling water and the concrete; if the cooling rate reaches or exceeds the cooling rate threshold, the cooling water temperature is controlled to increase between the first preset temperature and the third preset temperature to reduce the concrete cooling rate and prevent the concrete from cracking due to excessive temperature difference between the cooling water and the concrete; After the cooling water temperature reaches the third preset temperature, if the concrete cooling rate still exceeds the cooling rate threshold, the cooling water flow rate is controlled to increase to the second preset flow rate to minimize the concrete cooling rate; if the cooling water temperature is increased to the third preset temperature and the cooling water flow rate is increased to the second preset flow rate, the concrete cooling rate still exceeds the cooling rate threshold, an early warning message is sent to the mobile phone or computer via the cloud platform 11, and thermal insulation measures such as covering the large-volume concrete surface of the bridge pier with thermal insulation materials are manually taken to avoid too fast heat dissipation on the concrete surface, which causes the concrete cooling rate to further increase.

[0082] In step S44, the third preset temperature varies with the center temperature of the concrete. The third preset temperature may be the center temperature of the concrete plus a third set value of 20°C. The threshold value of the cooling rate may be 2°C / day.

[0083] S45. As the temperature of concrete decreases, when the temperature difference between the inner and outer surfaces of the concrete is not greater than the set temperature difference of 15°C, and the difference between the center temperature of the concrete and the ambient temperature is less than the set temperature difference of 15°C, the intelligent temperature control system can be turned off; if the above conditions are not met due to factors such as changes in ambient temperature, the intelligent temperature control system should be restarted.

[0084] Preferably, during the heating stage, the system master control device 9 controls the first cooling water outlet 22 of the three-way ball valve 2 to be in an open state and the second cooling water outlet 23 to be in a closed state, so that the cooling water flowing out from the cooling water pipe outlet b2 enters the hot water tank 4 through the first cooling water outlet 22 to recycle the cooling water, reduce the frequency of heating the water in the hot water tank, and save energy consumption.

[0085] Preferably, in the cooling stage, the system master control device 9 receives the temperature data of the cold water temperature sensor 32 and the cooling water outlet temperature sensor 13, and compares the two. If the temperature value of the cooling water outlet temperature sensor 13 is greater than the temperature value of the cold water temperature sensor 32, the first cooling water outlet 22 of the three-way ball valve 2 is controlled to be in an open state and the second cooling water outlet 23 is controlled to be in a closed state, so that the cooling water flowing out from the cooling water pipe outlet b2 enters the hot water tank 4 through the first cooling water outlet 22, so as to recycle the cooling water, reduce the frequency of heating the water in the hot water tank, and save energy consumption; if the temperature value of the cooling water outlet temperature sensor 13 is not higher than the temperature value of the cold water temperature sensor 32, the first cooling water outlet 22 of the three-way ball valve 2 is controlled to be in a closed state and the second cooling water outlet 23 is controlled to be in an open state, so that the cooling water flowing out from the cooling water pipe outlet b2 enters the cold water tank 3 through the second cooling water outlet 23, so as to recycle the cooling water, reduce the frequency of cooling the water in the cold water tank, and save energy consumption.

[0086] Preferably, during the heating stage and the cooling stage, the system master control device 9 receives the temperature data of the cold water temperature sensor 32 and the hot water temperature sensor 42. If the temperature value of the cold water temperature sensor 32 is greater than the cooling water temperature to be controlled, the refrigerator 31 is controlled to be started; if the temperature value of the hot water temperature sensor 42 is less than the cooling water temperature to be controlled, the heater 41 is controlled to be started; if the cooling water temperature to be controlled is between the temperature values ​​of the cold water temperature sensor 32 and the hot water temperature sensor 42, the refrigerator 31 and the heater 41 are controlled to be turned off; by adopting the heater and the refrigerator, the cooling water temperature can be controlled to reach the set value under extreme temperature weather conditions, and the system has strong adaptability to the construction site environment.

[0087] S5. Maintain the bridge cap mass concrete to the preset requirements by dynamically controlling the temperature of the bridge cap mass concrete, and then turn off the intelligent temperature control system. After turning off the intelligent temperature control system, evacuate the water in the cold water tank 3 and the hot water tank 4, disconnect the cooling water pipe inlet b1 from the main water pipe outlet a2, and disconnect the cooling water pipe outlet b2 from the main water pipe inlet a1, and disconnect the concrete surface temperature sensor 14 and the concrete center temperature sensor 15 from the temperature acquisition device 8, and use an air compressor to drain the residual water in the cooling water pipe 17, blow dry the cooling water pipe 17, and use micro-expansion mortar or clean mortar with a strength grade not lower than that of the concrete to grout and seal the fracture.

[0088] The embodiments described above are only descriptions of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An intelligent temperature control system for large-volume concrete of bridge cap, characterized in that: include: A water treatment plant for treating water extracted from the bridge cap construction site; A temperature acquisition device, used to obtain temperature data detected by temperature sensors arranged inside the water treatment device and the large-volume concrete structure of the bridge pier; A system master control device, connected to the water treatment device and the temperature acquisition device, for receiving the temperature data and regulating the water treatment device; A wireless communication device connected to the system master control device and used for transmitting data received and generated by the system master control device; A cloud platform for receiving and storing data transmitted by the wireless communication device for users to view and issuing user instructions; A power supply device is used to supply power to the water treatment device, the temperature collection device, the system master control device and the wireless communication device.

2. The intelligent temperature control system for mass concrete of bridge cap according to claim 1 is characterized in that: The water treatment device comprises: A main water pipe, provided with a main water pipe water inlet and a main water pipe water outlet; A three-way ball valve is provided with a cooling water inlet, a first cooling water outlet and a second cooling water outlet; wherein the cooling water inlet is connected to one end of the main water pipe water inlet; A cold water tank, wherein a refrigerator and a cold water temperature sensor are provided inside, wherein the cold water temperature sensor is used to detect the temperature of cold water in the cold water tank; the cold water tank is connected to the second cooling water outlet through the main water pipe; A hot water tank, wherein a heater and a hot water temperature sensor are provided inside, wherein the hot water temperature sensor is used to detect the temperature of hot water in the hot water tank; the hot water tank is connected to the first cooling water outlet through the main water pipe; The thermostatic water mixing valve is provided with a cold water inlet, a hot water inlet and a mixed water outlet, and is used to mix and adjust the cold water and hot water so that the temperature of the cooling water flowing out of the mixed water outlet reaches the set value; A first variable frequency water pump is arranged on the main water pipe connecting the cold water inlet and the cold water tank; A second variable frequency water pump is arranged on the main water pipe connecting the hot water inlet and the hot water tank; The constant temperature mixing water valve controls the flow rate of cooling water by interlocking with the first variable frequency water pump and the second variable frequency water pump.

3. The intelligent temperature control system for large-volume concrete of bridge cap according to claim 2 is characterized in that: The temperature sensors installed in the large-volume concrete structure of the bridge cap include concrete surface temperature sensors and concrete center temperature sensors; The temperature sensor also includes an ambient temperature sensor and a cooling water outlet temperature sensor.

4. The intelligent temperature control system for mass concrete of bridge cap according to claim 2 is characterized in that: The system master control device is connected with the three-way ball valve, the refrigerator, the heater, the first variable frequency water pump, the second variable frequency water pump, the constant temperature mixing valve, the temperature collection device and the wireless communication device.

5. The intelligent temperature control system for bridge cap mass concrete according to claim 1 is characterized in that: The power supply device adopts a UPS battery, wherein the UPS battery is charged by the alternating current at the construction site or a solar panel.

6. An intelligent temperature control method for mass concrete of a bridge cap, using the intelligent temperature control system of claim 3, characterized in that: The following steps are involved: The system master control device receives the temperature data detected by the concrete center temperature sensor, the concrete surface temperature sensor and the ambient temperature sensor acquired by the temperature acquisition device, and uses the temperature value of the concrete center temperature sensor as the concrete center temperature, the average value of the temperature values ​​of all concrete surface temperature sensors as the concrete surface temperature, and the temperature value of the ambient temperature sensor as the ambient temperature. At the same time, the difference between the concrete center temperature and the concrete surface temperature is used as the concrete inner surface temperature difference; The central temperature of the concrete is analyzed by the system master control device, and it is judged whether the mass concrete of the bridge cap is in a heating stage or a cooling stage; In the temperature rising stage, the system master control device controls the first variable frequency water pump, the second variable frequency water pump and the constant temperature mixing valve, so that the temperature of the cooling water flowing out of the mixed water outlet is between the first preset temperature and the second preset temperature, and controls the cooling water flow rate between the first preset flow rate and the second preset flow rate; As the temperature of concrete rises, if the concrete center temperature received by the system master control device reaches or exceeds the first temperature threshold, or the temperature difference between the inner and outer surfaces of the concrete calculated by the system master control device reaches or exceeds the second temperature threshold, the cooling water flow rate is controlled to increase to the second preset flow rate, and the cooling water temperature is controlled to the first preset temperature at the same time; if the temperature difference between the inner and outer surfaces of the concrete still exceeds the second temperature threshold after the cooling water flow rate is increased to the second preset flow rate and the cooling water temperature is controlled to the first preset temperature, a temperature warning is issued; wherein the first preset temperature and the second preset temperature both change with the concrete center temperature; In the cooling stage, the system master control device calculates the concrete cooling rate according to the concrete center temperature, and controls the cooling water temperature and flow rate according to the concrete center temperature and the concrete cooling rate, so that the cooling water temperature is between the first preset temperature and the third preset temperature, and the concrete cooling rate is not greater than the cooling rate threshold; if the concrete cooling rate reaches or exceeds the cooling rate threshold, the cooling water temperature is controlled to increase between the first preset temperature and the third preset temperature; if the concrete cooling rate still exceeds the cooling rate threshold after the cooling water temperature is increased to the third preset temperature, the cooling water flow rate is controlled to increase to the second preset flow rate; if the concrete cooling rate still exceeds the cooling rate threshold after the cooling water temperature is increased to the third preset temperature and the cooling water flow rate is increased to the second preset flow rate, a temperature warning is issued; wherein the third preset temperature changes with the concrete center temperature; According to the dynamic temperature control of the massive concrete of the bridge pedestal during the heating stage or the cooling stage, the massive concrete of the bridge pedestal is maintained to the preset requirements and the intelligent temperature control system is turned off; wherein the preset requirements are: the temperature difference between the inner and outer surfaces of the concrete is not greater than the set temperature difference value, and the difference between the center temperature of the concrete and the ambient temperature is less than the set temperature difference value.

7. The intelligent temperature control method for mass concrete of bridge cap according to claim 6 is characterized in that: The judgment of whether the mass concrete of the bridge cap is in the heating stage or cooling stage includes: When the average value of the continuous setting time of the concrete center temperature is greater than the average value of the previous setting time, it is the heating stage, otherwise it is the cooling stage.

8. The intelligent temperature control method for mass concrete of bridge cap according to claim 6 is characterized in that: It also includes shutting down the intelligent temperature control system, pumping out the water in the intelligent temperature control system, disconnecting the concrete surface temperature sensor and the concrete center temperature sensor from the temperature collection device, draining the residual water, blowing dry the water pipes, and using micro-expansion mortar or clean slurry with a strength grade not lower than that of the concrete to grout and seal the fracture.

9. The intelligent temperature control method for mass concrete of a bridge cap according to any one of claims 6 to 8, characterized in that: During the heating stage, the system master control device controls the first cooling water outlet of the three-way ball valve to be in an open state and the second cooling water outlet to be in a closed state, so that the cooling water flowing out of the cooling water pipe outlet enters the hot water tank through the first cooling water outlet.

10. The intelligent temperature control method for mass concrete of a bridge cap according to any one of claims 6 to 8, characterized in that: In the cooling stage, the system master control device receives the temperature data of the cold water temperature sensor and the cooling water outlet temperature sensor. If the temperature value of the cooling water outlet temperature sensor is greater than the temperature value of the cold water temperature sensor, the first cooling water outlet of the three-way ball valve is controlled to be in an open state and the second cooling water outlet is in a closed state, so that the cooling water flowing out of the cooling water pipe outlet enters the hot water tank through the first cooling water outlet; If the temperature value of the cooling water outlet temperature sensor is not higher than the temperature value of the cold water temperature sensor, the first cooling water outlet of the three-way ball valve is controlled to be in a closed state and the second cooling water outlet is in an open state, so that the cooling water flowing out of the cooling water pipe outlet enters the cold water tank through the second cooling water outlet.

Images