CN214937079U - Automatic temperature control device for mass concrete - Google Patents
Automatic temperature control device for mass concrete Download PDFInfo
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- CN214937079U CN214937079U CN202121260199.3U CN202121260199U CN214937079U CN 214937079 U CN214937079 U CN 214937079U CN 202121260199 U CN202121260199 U CN 202121260199U CN 214937079 U CN214937079 U CN 214937079U
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Abstract
The utility model relates to a concrete equipment field discloses an automatic temperature control device of bulky concrete to carry out automatic temperature control to the concrete at concrete placement, maintenance process. The utility model comprises a liquid cooling system main body, a temperature control system, a data transmission structure and a medium transmission structure which are connected with the liquid cooling system main body and the temperature control system; the liquid cooling system main body comprises a pressure-resistant pipe, a liquid-isolating pipe and a temperature sensing element, wherein the temperature sensing element is arranged in the liquid-isolating pipe, the liquid-isolating pipe is arranged in the pressure-resistant pipe, and a closed medium cavity is formed between the pressure-resistant pipe and the liquid-isolating pipe; the temperature control system comprises a temperature monitoring system, a hydraulic control system and a brake system contained between the temperature monitoring system and the hydraulic control system, the temperature monitoring system is in data communication with the temperature sensing element through a data transmission structure, and the hydraulic control system is in temperature control medium circulation with the medium cavity through a medium transmission structure. The utility model is suitable for a concrete placement, maintenance.
Description
Technical Field
The utility model relates to a concrete equipment field, in particular to automatic temperature control device of bulky concrete.
Background
In the process of pouring and curing the concrete, a large amount of hydration heat can be emitted, the temperature rising and cooling processes of different regions are completed within a long time period, the volume expansion and shrinkage of the concrete are uneven, and the concrete is cracked.
The existing method for controlling the concrete temperature cracks is mainly realized by adjusting the concrete material proportion, reducing the thickness of a concrete pouring layer, reserving a water injection cooling hole, sprinkling water on the surface of the concrete for cooling or covering a heat insulation material and the like.
The concrete proportion can be adjusted by selecting low hydration heat cement, improving aggregate gradation and other methods, but the properties of the concrete can be changed, and the material cost is increased; the reduction of the thickness of the concrete pouring layer and the covering of the surface with the heat-insulating material are also easy to realize, but the influence on the construction progress is relatively large; the method for reserving the water injection cooling hole is most widely applied, but the water temperature is difficult to control by the water injection cooling method, the temperature difference of each unit volume of the concrete is identified, the improper water temperature adjustment can be contradictory, the manual temperature measurement on the concrete in real time has large workload, the internal temperature of the concrete is not suitable to be measured, the process is complex, and the accuracy is not high; the mode of sprinkling water to cool or covering heat-insulating materials on the surface of the concrete is relatively widely applied, but the method has higher requirement on the using time and simultaneously has insignificant temperature control effect in a mass concrete structure; therefore, it is necessary to research the automatic temperature control device for mass concrete.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: a large-volume concrete automatic temperature control device is provided so as to automatically control the temperature of concrete in the concrete pouring and curing process.
In order to solve the above problem, the utility model adopts the following technical scheme: the automatic temperature control device for the large-volume concrete comprises a liquid cooling system main body, a temperature control system arranged outside the liquid cooling system main body, and a data transmission structure and a medium transmission structure which are used for connecting the liquid cooling system main body and the temperature control system;
the liquid cooling system main body comprises a pressure-resistant pipe, a liquid-isolating pipe and a temperature sensing element, wherein the temperature sensing element is arranged in the liquid-isolating pipe, the liquid-isolating pipe is arranged in the pressure-resistant pipe, and a closed medium cavity is formed between the pressure-resistant pipe and the liquid-isolating pipe; the temperature control system comprises a temperature monitoring system, a hydraulic control system and a brake system contained between the temperature monitoring system and the hydraulic control system, the temperature monitoring system is in data communication with the temperature sensing element through a data transmission structure, and the hydraulic control system is in temperature control medium circulation with the medium cavity through a medium transmission structure.
Further, the temperature control medium is usually water because the price of water is low and the local materials are convenient to use.
Further, the structure of the pressure resisting pipe is a cylindrical structure.
The hardware system of the present invention will have the following beneficial effects after loading corresponding software (it should be noted that the software part is not the protection main body of the present invention, and at the same time, the software part is also easily obtained by those skilled in the art):
1. the temperature of each concrete unit can be automatically monitored, the temperature change process of the concrete can be monitored in real time, the setting and hardening time of the concrete can be estimated, the whole setting and hardening process of the concrete can be controlled, and the heat release process of the concrete can be controlled.
2. The water body control system can be braked by comparing the temperature difference of each water cooling system to adjust the water temperature, so that the internal structure of the concrete can be cooled, and the surface of the concrete can be heated in a low-temperature environment; the temperature difference of the concrete can be controlled in real time without manual action, and the temperature cracks of the concrete are avoided as much as possible.
3. The pressure-resistant pipe of the automatic temperature control device for mass concrete of the utility model adopts a cylindrical structure to reduce the stress concentration to the maximum extent, thereby reducing the influence on the stress distribution condition of the concrete structure main body; resistance to compression pipe cross-section diameter can be adjusted as required according to the circumstances such as component size, device distribution density, in order to increase the utility model discloses a universality.
4. The utility model discloses a bulky concrete automatic temperature control device can take out after concrete setting and hardening integral process is accomplished, on the one hand is convenient for retrieve, reuse, reduces equipment manufacturing cost, reduces project construction cost; on the other hand, the reserved holes can be used for burying a prestressed member in a post-tensioning method, and can also be used as expansion joints through structural transformation. When the bearing capacity of the concrete structure is higher, only the main body part of the member can be dismantled, and the compression-resistant steel pipe is reserved so as to meet the bearing capacity of the concrete structure.
Drawings
FIG. 1 is a basic structure diagram of the present invention;
fig. 2 is the water-cooling structure layout schematic diagram of the present invention.
Detailed Description
In order to carry out automatic temperature control's problem to the concrete in concrete placement, maintenance process, the embodiment of the utility model provides an automatic temperature control device suitable for bulky concrete comprises water cooling system main part, temperature control system, transmission structure triplex.
The water cooling system main body comprises a pressure-resistant steel pipe 1, a PVC marine riser 2 and a temperature sensing element 3, wherein the PVC marine riser 2 and the temperature sensing element 3 are arranged in the pressure-resistant steel pipe 1; a closed medium cavity is formed between the pressure-resistant steel pipe 1 and the PVC marine riser 2, a water-cooling medium (temperature control medium) is arranged in the medium cavity, and a temperature sensing element 3 is arranged in the PVC marine riser 2. The compression-resistant steel pipe 1 is used for protecting the PVC marine riser 2 from being damaged by concrete gravity and concrete expansion deformation and extrusion; the PVC riser 2 is used to protect the temperature sensing element 3 from erosion by the body of water.
The transmission structure 8 is mainly used for medium exchange in the medium cavity, the transmission structure 8 comprises a water inlet pipe 9 and a water outlet pipe 10, a proper amount of non-temperature-suitable water-cooling medium (temperature control medium) is discharged from the medium cavity through the water outlet pipe 10, a proper amount of temperature-suitable water-cooling medium (temperature control medium) is input into the medium cavity through the water inlet pipe 9, medium exchange is completed, and the internal temperature of the concrete is controlled to be proper.
The temperature control system comprises a temperature monitoring system 5, a water control system 7 and a brake system 6 accommodated between the two. The temperature control system 5 completes data transmission through the temperature control transmission structure 4 (a wire or wireless structure can be selected as required) and the temperature sensing element 3, and meanwhile, the temperature monitoring system 5 monitors the environment temperature (the external environment of the concrete); the water control system 7 is communicated with the water cooling system through a water guide pipe 8 and is used for conveying a water cooling medium (temperature control medium) to the space between the pressure-resistant steel pipe 1 and the PVC marine riser 2.
The temperature sensing element 3 is used for monitoring the air temperature t in the PVC water-resisting pipe1Indirectly calculating the temperature t of the water cooling medium (temperature control medium)2(ii) a According to the principle of heat balance, a uniform, isotropic temperature field satisfies the differential equation of the following formula:
wherein, the temperature is the medium adiabatic temperature rise (DEG C), and a is the thermal coefficient (m)2·h-1) T is time(s) and τ is age (day). At normal temperature (20 ℃), the heat conductivity coefficient of air is 0.0267W/m.K, and the space in the PVC riser 2 is narrow, so that heat can be quickly transferred, namely t can be considered as1≈t2。
Further, the temperature sensing element 3 is also sensitive to the ambient temperature t3(the temperature of the external environment where the concrete is located) and a water-cooling medium (temperature control medium) with the same temperature as the ambient temperature, namely t, is input through the water inlet pipe 92＝t3So that the internal temperature of the concrete and the external temperature of the concrete are synchronously reduced and gradually approach to the ambient temperature, thereby reducing the cracking of the surface of the concrete caused by the overlarge temperature difference between the inside and the outside of the concrete in the concrete pouring and curing processes.
Notably, such asIf the concrete temperature reduction rate needs to be accelerated, the water inlet pipe 9 can be used for inputting a water-cooling medium (temperature control medium) which is slightly lower than the ambient temperature, namely t2<t3However, in this case, the temperature difference Δ t ═ t should be reasonably controlled according to the concrete properties and blending ratio3-t2So as to avoid temperature cracks in the concrete (the outer wall of the pressure-resistant steel pipe is adjacent to the concrete).
According to the basic principle of an elastomechanics finite element method:
KiΔδi＝ΔPi G+ΔPi C+ΔPi T+ΔPi S
in the formula: delta deltai、ΔPi C、ΔPi S、ΔPi GAnd Δ Pi TRespectively representing node displacement increment on a domain, node force increment caused by creep, node force increment caused by dry shrinkage, node force increment caused by external load and node force increment caused by temperature difference, and experimental analysis shows that the node force increment caused by temperature difference
The resulting displacement increment deltaiThe maximum, i.e. internal and external temperature differences of the concrete are important factors causing temperature cracks.
Application the utility model discloses, can lay the position and lay quantity through adjusting automatic temperature control device, effectively reduce the node power increment delta P that the difference in temperature arousesi TAnd the stress increment of each concrete unit is reduced, so that the probability of concrete surface cracking is greatly reduced.
As shown in fig. 2, in the concrete pouring process, according to the factors such as the volume of the concrete pouring block, the temperature control precision requirement and the like, the compression-resistant steel pipes are arranged in the concrete pouring block as required, and the arrangement and assembly of other structural elements are completed. FIG. 2 shows a single-layer arrangement, and the device can also adopt a multi-layer arrangement according to the thickness of a concrete pouring block in practical application; in addition, the casting blocks can be uniformly arranged at equal intervals and non-uniformly arranged at unequal intervals according to the casting block shape.
In the automatic temperature control device, the compression-resistant steel pipe adopts a cylindrical structure so as to reduce stress concentration to the maximum extent, thereby reducing the influence on the stress distribution condition of the concrete structure main body; the diameter of the section of the steel pipe can be adjusted as required according to the conditions of the size of the component, the distribution density of the device and the like, so as to increase the universality of the utility model.
The automatic temperature control device of the utility model can be taken out after the concrete coagulation and hardening integral process is completed, thereby being convenient for recovery and reuse, reducing the equipment manufacturing cost and the project construction cost; on the other hand, the reserved holes can be used for burying a prestressed member in a post-tensioning method, and can also be used as expansion joints through structural transformation. When the bearing capacity of the concrete structure is higher, only the main body part of the member can be dismantled, and the compression-resistant steel pipe is reserved so as to meet the bearing capacity of the concrete structure.
The utility model discloses an automatic temperature control device, when each water cooling system difference in temperature is less, the digital signal that temperature sensing element 3 produced only activates temperature monitoring system 5's temperature monitoring function, whether fall to suitable temperature with detecting the temperature, whether guarantee the concrete temperature suitable, whether stable, if the temperature is higher, then aqueduct 8 keeps water-cooling medium (temperature control medium) input state, continue to cool down concrete structure, inlet tube 9 and drain pipe 10 continue to carry out water-cooling medium (temperature control medium) and get rid of, form the energy exchange that the medium exchange (the heat transfer arouses), and retrieve the cooling to the medium after the temperature regulation, reuse.
When the temperature difference of each water cooling system exceeds a limit value (the temperature difference between the internal temperature of the concrete and the external environment temperature at which the concrete is located is too large), the digital signal generated by the temperature sensing element 3 activates the temperature monitoring function and the temperature difference adjusting function of the temperature monitoring system 5 at the same time so as to adjust the temperature of the concrete unit with larger temperature difference, continuously supply a medium with lower temperature to the concrete water cooling unit with higher temperature, accelerate the cooling, and perform proper heating adjustment on the concrete water cooling unit with lower temperature so as to avoid temperature cracks caused by local temperature difference.
Therefore, the utility model discloses can realize bulky concrete temperature real-time supervision to avoid the local difference in temperature of concrete structure too big, the whole inside and outside difference in temperature too big, monitor concrete temperature, and realize automatic temperature regulation, solve because the crack problem that concrete temperature variation, the difference in temperature arouse greatly. Meanwhile, the structure is convenient to be flexible in size and distribution, convenient to arrange and high in universality; the medium can be recycled, and the method is economical and environment-friendly; the equipment is low in cost, convenient to dismantle and recycle and capable of greatly saving cost; the reserved holes of the equipment have strong functionality and are flexible to upgrade and modify.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the details of the above embodiments, and the technical concept of the present invention can be modified to perform various equivalent transformations, which all belong to the protection scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations.
In addition, various embodiments of the present invention can be combined arbitrarily, and the disclosed content should be regarded as the present invention as long as it does not violate the idea of the present invention.
Claims (3)
1. The automatic temperature control device for the mass concrete is characterized by comprising a liquid cooling system main body, a temperature control system arranged outside the liquid cooling system main body, a data transmission structure (4) and a medium transmission structure (8) which are used for connecting the liquid cooling system main body and the temperature control system;
the liquid cooling system main body comprises a pressure-resistant pipe (1), a liquid-isolating pipe (2) and a temperature sensing element (3), the temperature sensing element (3) is arranged in the liquid-isolating pipe (2), the liquid-isolating pipe (2) is arranged in the pressure-resistant pipe (1), and a closed medium cavity is formed between the pressure-resistant pipe (1) and the liquid-isolating pipe (2); the temperature control system comprises a temperature monitoring system (5), a hydraulic control system (7) and a braking system (6) accommodated between the temperature monitoring system (5) and the hydraulic control system (7), the temperature monitoring system (5) is communicated with the temperature sensing element (3) through a data transmission structure (4), and the hydraulic control system (7) is communicated with the medium cavity through a medium transmission structure (8) to realize temperature control medium circulation.
2. The automatic temperature control device for mass concrete according to claim 1, wherein the temperature control medium is water.
3. The automatic temperature control device for mass concrete according to claim 1, characterized in that the structure of said pressure-resistant pipe (1) is a cylindrical structure.
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| CN202121260199.3U CN214937079U (en) | 2021-06-07 | 2021-06-07 | Automatic temperature control device for mass concrete |
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| CN202121260199.3U CN214937079U (en) | 2021-06-07 | 2021-06-07 | Automatic temperature control device for mass concrete |
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| CN214937079U true CN214937079U (en) | 2021-11-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113213966A (en) * | 2021-06-07 | 2021-08-06 | 中国电建集团成都勘测设计研究院有限公司 | Automatic temperature control device for mass concrete |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113213966A (en) * | 2021-06-07 | 2021-08-06 | 中国电建集团成都勘测设计研究院有限公司 | Automatic temperature control device for mass concrete |
| CN113213966B (en) * | 2021-06-07 | 2024-01-23 | 中国电建集团成都勘测设计研究院有限公司 | Automatic temperature control device for mass concrete |
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