Large-size bearing platform concrete intelligent temperature control system

Abstract

The utility model relates to a mass bearing platform concrete intelligent temperature control system which comprises a cooling water pipe, a plurality of temperature sensors, intelligent collectors, a collection concentrator and a temperature control unit, the plurality of temperature sensors are embedded in a mass bearing platform, and the temperature sensors are respectively connected with the intelligent collectors in a one-to-one correspondence mode. The intelligent collectors are connected to the collection concentrator, the collection concentrator is connected to the monitoring system, the cooling water pipe is provided with a temperature sensor, and the monitoring system controls the temperature of the cooling water pipe according to temperature information of the temperature sensor buried in the large-size bearing platform. The device has the advantages that the parameters of the cooling water pump are automatically adjusted according to the measured temperature of the mass concrete, so that the flow of the cooling water pipe in the concrete is adjusted to achieve the purpose of cooling; emergency mode switching is achieved, automatic switching is achieved when a system breaks down, normal operation of the cooling water pump is ensured, and an alarm is given; and the automation level of temperature monitoring and control in mass concrete construction is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of mass concrete construction, in particular to an intelligent temperature control system for mass concrete caissons. Background Technique

[0002] For mass concrete, during the construction process, due to factors such as temperature and humidity changes, the influence of concrete creep, uneven settlement of the foundation, premature form removal, and early vibration, concrete cracks may occur. Generally, the following situations are included:

[0003] (1) Cracks caused by the influence of cement hydration heat: For mass concrete, a large amount of heat will be released during the cement hydration process, concentrated around 7 days after concrete pouring, generally reaching about 70°C or even higher. Due to the different heat dissipation conditions inside and on the surface of the concrete, a large temperature difference will be generated between the center and the surface of the concrete. The formation of the temperature gradient will cause compressive stress inside the concrete and tensile stress on the surface. When the tensile stress exceeds the ultimate tensile strength of the concrete, cracks will occur on the concrete surface.

[0004] (2) Cracks caused by concrete shrinkage. The phenomenon that the volume of concrete decreases during the hardening process is called concrete shrinkage. And this spontaneous deformation of the concrete will generate tensile stress in the concrete when it is restricted by external constraints (such as support conditions, steel bars, etc.), causing the concrete to crack. The volume change of concrete in the initial stage of hardening is mainly contributed by cement and coarse aggregates during the hydration, solidification, and hardening process, and in the later stage, it is mainly the dry shrinkage deformation caused by the evaporation of free water in the concrete.

[0005] (3) Cracks caused by changes in external air temperature and humidity. When the external environment or the internal temperature of the structure where the concrete is located changes, the concrete deforms due to thermal expansion and contraction. If this deformation is restricted, stress will be generated in the structure. When the stress exceeds the tensile strength of the concrete, temperature cracks will occur. The internal temperature of the mass concrete structure is mainly composed of the superposition of various temperatures such as the pouring temperature, the adiabatic temperature rise of cement hydration heat, and the heat dissipation temperature of the structure. Among them, the pouring temperature of the concrete has a direct relationship with the external air temperature. The higher the external air temperature, the higher the pouring temperature of the concrete; conversely, when the external temperature drops, it will exacerbate the internal and external temperature gradient of the mass concrete. When the external temperature drops too fast, it is also extremely easy to cause the concrete to crack. The change in the humidity of the external environment also has a great impact on the cracking of the concrete. Since the decrease in the external humidity will accelerate the dry shrinkage of the concrete, it will also cause the generation of concrete cracks.

[0006] In the existing mass concrete construction, numerical simulation calculations and temperature monitoring of the concrete during the pouring process are carried out. Cooling is achieved by installing cooling water pipes in the concrete to reduce the internal temperature of the concrete, thereby reducing the temperature difference between the inside and outside of the mass concrete and avoiding the generation of temperature cracks caused by the internal and external temperature differences. Summary of the Invention

[0007] The purpose of the present utility model is to provide an intelligent temperature control system for mass concrete caissons according to the deficiencies of the above-mentioned existing technologies, which includes a method for arranging cooling water pipes, a method for arranging sensors, and an automatic temperature control system. It is particularly suitable for the automatic monitoring and control of temperature during the pouring process of mass concrete, solves the temperature rise inside the concrete and the temperature difference between the inside and outside during the pouring process of mass concrete, avoids the generation of temperature cracks caused by the temperature difference, and improves the construction quality of mass concrete.

[0008] The purpose of the present utility model is achieved by the following technical solutions:

[0009] An intelligent temperature control system for mass concrete caissons, characterized in that it includes cooling water pipes, a plurality of temperature sensors, intelligent collectors, acquisition concentrators, and a temperature control unit. A plurality of the temperature sensors are buried in the mass concrete caisson, each of the temperature sensors is respectively connected to the intelligent collector, each of the intelligent collectors is connected to the acquisition concentrator, the acquisition concentrator is connected to the monitoring system, the cooling water pipes are provided with temperature sensors, and the monitoring system controls the temperature of the cooling water pipes according to the temperature information of the temperature sensors buried in the mass concrete caisson.

[0010] Multiple layers of cooling water pipes are arranged in the height direction of the concrete of the mass concrete caisson. Each layer of the cooling water pipes is divided into odd-layer cooling water pipes and even-layer cooling water pipes according to the layer it is located in. Among them, the extending arrangement directions of the odd-layer cooling water pipes and the even-layer cooling water pipes are staggered. The odd-layer cooling water pipes are meanderingly arranged along the length direction or the width direction in the mass concrete caisson, while the even-layer cooling water pipes are meanderingly arranged in the mass concrete caisson along a direction staggered with the odd-layer cooling water pipes.

[0011] The cooling water pipes are tied and fixed to the corresponding steel bars in the mass concrete caisson.

[0012] The temperature sensors are symmetrically arranged in the plane with the plane symmetry axis of the mass concrete caisson; and are evenly spaced along the height direction of the mass concrete caisson.

[0013] The temperature control system includes a wireless transmission control unit, a flow rate adjustment unit, and a liquid cooling unit. The wireless transmission control unit is connected to the monitoring system, and the flow rate adjustment unit and the liquid cooling unit are respectively connected to the cooling water pipe. The flow rate adjustment unit adjusts the flow rate parameter in the cooling water pipe, and the liquid cooling unit cools the coolant in the cooling water pipe.

[0014] The acquisition concentrator is connected with a field display screen.

[0015] The advantages of the present utility model are as follows: automatically adjusting the parameters of the cooling water pump according to the measured temperature of the mass concrete, thereby adjusting the flow rate of the cooling water pipe in the concrete to achieve the purpose of temperature reduction; having the switching of an emergency mode, automatically converting when a system failure occurs, ensuring the normal operation of the cooling water pump and giving an alarm; improving the automation level of temperature monitoring and control in the construction of mass concrete, reducing the working intensity of operators; having a simple and reasonable structure, being convenient for construction, and being suitable for popularization. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the layout diagram of the odd layers of the cooling water pipe in the present utility model;

[0017] Figure 2 It is the layout diagram of the even layers of the cooling water pipe in the present utility model;

[0018] Figure 3 It is the plane layout diagram of the measuring points in the present utility model;

[0019] Figure 4 It is the elevation layout diagram of the measuring points in the present utility model;

[0020] Figure 5 It is the system composition diagram of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The features of the present utility model and other related features will be further described in detail through embodiments with reference to the accompanying drawings for the understanding of those skilled in the same industry:

[0022] As Figures 1-5 shown, the marks 1 - 10 in the figure respectively represent: intelligent collector 1, temperature sensor 2, acquisition concentrator 3, field display screen 4, wireless transmission control unit 5, flow rate adjustment unit 6, cooling pipe 7, computer monitoring cloud platform 8, liquid cooling unit 9, and mass concrete platform 10.

[0023] Embodiment: As Figures 1 to 5 shown, the intelligent temperature control system for mass concrete platform in this embodiment includes a cooling water pipe layout structure, a sensor layout structure, and an automatic temperature control device.

[0024] Specifically, in this embodiment, in combination with Figure 1 and Figure 2 as shown, for the large-volume bearing platform, according to the finite element analysis and comparison, 4 layers of cooling water pipes 7 are arranged from top to bottom in the height direction of the concrete, and 2 layers of cooling water pipes are arranged in the thickness direction (4m) of the concrete. The elbow parts of the cooling water pipes are pretreated by cold bending process, and the connection parts are welded to ensure their tightness. In this embodiment, the cooling water pipes 7 should be tied to the corresponding steel bars of the bearing platform, and the height of each layer can be appropriately adjusted according to the steel bar arrangement in the bearing platform. During the embedding and concrete pouring process of the cooling pipes, blockage, water leakage and damage due to vibration should be prevented.

[0025] Comparing Figure 1 and Figure 2 as shown, in the large-volume bearing platform, the arrangement directions of the odd-layer cooling water pipes and the even-layer cooling water pipes are staggered, so as to improve the cooling effect of the cooling water pipes on the concrete. A water pump is installed at the water inlet of the cooling water pipes to perform a cooling water circulation to cool the large-volume concrete internally.

[0026] As Figure 3 and Figure 4 shown, in this embodiment, temperature sensors serving as monitoring points are arranged in the large-volume bearing platform. The arrangement structure of each temperature sensor should truly reflect the maximum temperature rise, the temperature difference between the inside and the surface, the cooling rate and the ambient temperature in the concrete casting body. This embodiment is arranged in the following way: the arrangement range of the monitoring points should be the test area with the symmetry axis of the selected concrete casting body plan view as the reference, and the monitoring points in the test area are arranged in a plane stratified manner; on each test axis, they should be arranged according to the geometric dimensions of the structure. Arranged in this way, all concrete areas can be covered, enabling the use of a small number of "on-site data collectors" for the temperature measurement of the entire floor slab. Considering the large volume and long pouring time of the bearing platform, some measuring points are extended on the axis, and thus the temperature of the entire bearing platform can be obtained through automatic data analysis.

[0027] In this embodiment, 5 cross-sections are arranged vertically in the large-volume bearing platform. Each group contains five temperature sensors, which are vertically arranged at positions 50mm from the surface, at the upper 1 / 4 position, at the middle position, at the lower 1 / 4 position, and at the bottom position 50mm respectively.

[0028] As Figure 5As shown in the figure, this embodiment includes a temperature monitoring part and a temperature control part. The temperature monitoring system adopts a real-time monitoring wireless cloud platform system. This system consists of: a computer monitoring software cloud platform 8, an intelligent collector 1, a temperature sensor 3, a collection concentrator 3, a field display screen 4, etc. Further, the system can, through the configuration of sensor technology, wireless communication technology, and automation control technology, combined with database cloud platform technology and digital recognition and anti-electromagnetic interference technology, realize on-site and remote intelligent online monitoring and early warning of temperature under industrial and civil conditions. Monitoring personnel can view data in real time on the web page and APP, and query and print reports.

[0029] The on-site temperature sensor 2 is buried in the mass concrete. The intelligent collector 1 obtains the temperature of the mass concrete and the inlet and outlet of the cooling water pipe in real time through the temperature sensor 2. The data of all intelligent collectors are transmitted to the collection concentrator 3 through the local area network. The concentrator 3 uploads the temperature data of the concrete to the computer monitoring software cloud platform through the 4G wireless network. The temperature of the mass concrete can be remotely monitored and queried on the software platform. The collector and the concentrator are composed of a level converter and a 4G chip. The device adopts a dual-power supply scheme of solar power supply and built-in lithium battery, and unique low-power consumption and automatic wake-up technology, which can ensure continuous collection of temperature data. At the same time, through anti-electromagnetic digital recognition technology, the security and accuracy of data transmission are ensured.

[0030] The field display screen 4 can display the highest temperature of the mass concrete, the internal and external temperature difference, and the cooling water flow parameters in real time.

[0031] The temperature control system consists of a wireless transmission control unit 5, a flow regulation unit 6, a cooling pipe 7, a liquid cooling unit 9, etc. The cooling pipe 7 is buried in the mass concrete. According to the concrete temperature measured by the temperature monitoring system, the wireless transmission control unit 5 analyzes and calculates, gives an instruction to the flow regulation unit 6, and adjusts the flow parameters in the cooling water pipe 7, so as to control the flow of the cooling water and control the temperature of the mass concrete. When the flow reaches the limit value and still cannot control the temperature rising rate, the liquid cooling unit 9 starts to act, further cools the coolant about to enter the water pipe, and strengthens its cooling effect on the bearing platform.

[0032] In specific implementation, this embodiment can control the temperature during the on-site mass concrete construction, avoid concrete cracks caused by temperature differences, and provide a good construction method and system for the on-site construction.

[0033] Although the above embodiments have detailed the concept and implementation of the purpose of the present invention with reference to the accompanying drawings, those of ordinary skill in the art can recognize that various improvements and transformations can still be made to the present invention without departing from the scope defined by the claims, so they will not be elaborated here one by one.

Claims

1. An intelligent temperature control system for mass concrete pile caps, characterized in that: It includes cooling water pipes, several temperature sensors, intelligent collectors, acquisition concentrators and temperature control units. A number of the temperature sensors are embedded in the large-volume bearing platform. Each of the temperature sensors is respectively and correspondingly connected to the intelligent collector. Each of the intelligent collectors is connected to the acquisition concentrator. The acquisition concentrator is connected to the monitoring system. The cooling water pipes are provided with temperature sensors. The monitoring system controls the temperature of the cooling water pipes according to the temperature information of the temperature sensors embedded in the large-volume bearing platform; Multiple layers of cooling water pipes are arranged in the concrete height direction of the large-volume bearing platform. Each layer of the cooling water pipes is divided into odd-layer cooling water pipes and even-layer cooling water pipes according to the layer where it is located. Among them, the extending arrangement directions of the odd-layer cooling water pipes and the even-layer cooling water pipes are staggered. The odd-layer cooling water pipes are arranged in a meandering manner along the length direction or width direction in the large-volume bearing platform, while the even-layer cooling water pipes are arranged in a meandering manner in the large-volume bearing platform along the direction staggered with the odd-layer cooling water pipes; The temperature sensors are symmetrically arranged in the plane with respect to the plane symmetry axis of the large-volume bearing platform; and are evenly spaced along the height direction of the large-volume bearing platform.

2. The intelligent temperature control system for mass concrete pile caps according to claim 1, wherein: The cooling water pipes are tied and fixed to the corresponding steel bars in the large-volume bearing platform.

3. The intelligent temperature control system for mass concrete pile caps according to claim 1, characterized in that: The temperature control unit includes a wireless transmission control unit, a flow regulation unit and a liquid cooling unit. Among them, the wireless transmission control unit is connected to the monitoring system, and the flow regulation unit and the liquid cooling unit are respectively connected to the cooling water pipes. Among them, the flow regulation unit regulates the flow parameters in the cooling water pipes, and the liquid cooling unit cools the coolant in the cooling water pipes.

4. The intelligent temperature control system for mass concrete pile caps according to claim 1, wherein: The acquisition concentrator is connected with a field display screen.

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