CN113213966B - Automatic temperature control device for mass concrete - Google Patents
Automatic temperature control device for mass concrete Download PDFInfo
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- CN113213966B CN113213966B CN202110632815.1A CN202110632815A CN113213966B CN 113213966 B CN113213966 B CN 113213966B CN 202110632815 A CN202110632815 A CN 202110632815A CN 113213966 B CN113213966 B CN 113213966B
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- 238000001816 cooling Methods 0.000 claims abstract description 25
- 238000012544 monitoring process Methods 0.000 claims abstract description 21
- 230000005540 biological transmission Effects 0.000 claims abstract description 20
- 230000006835 compression Effects 0.000 claims abstract description 19
- 238000007906 compression Methods 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 238000000926 separation method Methods 0.000 claims abstract description 8
- 238000004891 communication Methods 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 42
- 238000000034 method Methods 0.000 abstract description 20
- 230000008569 process Effects 0.000 abstract description 13
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- 239000002826 coolant Substances 0.000 description 9
- 238000005336 cracking Methods 0.000 description 5
- 238000009826 distribution Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000012774 insulation material Substances 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0075—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability making use of a decrease in temperature
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention relates to the field of concrete equipment, and discloses an automatic temperature control device for mass concrete, which is used for automatically controlling the temperature of the concrete in the concrete pouring and curing process. The invention comprises a liquid cooling system main body, a temperature control system, and 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 compression-resistant pipe, a liquid separation pipe and a temperature sensing element, wherein the temperature sensing element is arranged in the liquid separation pipe; the temperature control system comprises a temperature monitoring system, a hydraulic control system and a braking system accommodated between the temperature monitoring system and the hydraulic control system, wherein 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 communication with the medium cavity through a medium transmission structure. The invention is suitable for concrete pouring and curing.
Description
Technical Field
The invention relates to the field of concrete equipment, in particular to an automatic temperature control device for mass concrete.
Background
In the process of pouring and curing concrete, a large amount of hydration heat can be emitted, and the rising and the lowering of temperature of different areas are completed within a longer period of time, so that the volume of the concrete is expanded and contracted unevenly, thereby causing cracking of the concrete, and the cracks are most prominent in a large-volume concrete structure.
The existing method for controlling the concrete temperature cracks is mainly realized by means of adjusting the proportion of concrete materials, reducing the thickness of a concrete pouring layer, reserving water injection cooling holes, sprinkling water on the surface of the concrete for cooling or covering heat insulation materials and the like.
The concrete proportion can be adjusted by selecting low-hydration cement, improving aggregate grading and the like, 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 surface covering of the heat insulation material are easy to realize, but the influence on the construction progress is relatively large; the method for reserving the water injection cooling holes is widely applied, but the water temperature is difficult to control by the water injection cooling method, the temperature difference of each unit volume of concrete is identified, the unsuitable water temperature adjustment can be the opposite, the workload of manually measuring the temperature of the concrete in real time is large, the temperature inside 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 the surface of the concrete or covering the heat insulation material is also relatively widely applied, but the method has higher requirement on the use time, and meanwhile, the temperature control effect in a large-volume concrete structure is not obvious; it is necessary to study the automatic temperature control device for mass concrete.
Disclosure of Invention
The invention aims to solve the technical problems that: an automatic temperature control device for mass concrete is provided, so that the temperature of the concrete can be automatically controlled in the concrete pouring and curing process.
In order to solve the problems, the invention adopts the following technical scheme: the automatic mass concrete temperature control device 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 connected with the liquid cooling system main body and the temperature control system;
the liquid cooling system main body comprises a compression-resistant pipe, a liquid separation pipe and a temperature sensing element, wherein the temperature sensing element is arranged in the liquid separation pipe; the temperature control system comprises a temperature monitoring system, a hydraulic control system and a braking system accommodated between the temperature monitoring system and the hydraulic control system, wherein 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 communication with the medium cavity through a medium transmission structure.
Furthermore, because the price of water is relatively low, and local materials are conveniently obtained, the temperature control medium is usually water.
Further, the structure of the compression-resistant pipe is a cylindrical structure.
According to the embodiment, when the temperature control is performed automatically, the temperature monitoring system compares the internal temperature signal of the concrete fed back by the temperature sensing element with the external temperature signal monitored by the temperature monitoring system, calculates a temperature difference signal, outputs a temperature control signal and transmits a braking signal through the braking system; after the hydraulic control system receives a braking signal through the braking system, a proper amount of non-temperature-adaptive temperature control medium is discharged from the medium cavity according to the braking information control medium transmission structure, and a proper amount of temperature-adaptive temperature control medium is input into the medium cavity, so that the internal temperature of the concrete and the external temperature of the concrete synchronously drop and gradually approach to the ambient temperature, and the cracking of the concrete surface caused by overlarge temperature difference between the inside and the outside of the concrete in the concrete pouring and curing process is reduced.
Further, the temperature of the temperature-adapted temperature control medium may be equal to an ambient temperature.
Further, if the concrete temperature drop rate needs to be accelerated, the temperature t of the temperature-adaptive temperature control medium 2 Can also be lower than the ambient temperature t 3 But the temperature difference delta t=t needs to be reasonably controlled according to the concrete properties and the proportioning condition 3 -t 2 。
The beneficial effects of the invention are as follows:
1. the automatic temperature control device for the mass concrete can automatically monitor the temperature of each concrete unit, monitor the temperature change process of the concrete in real time, and estimate the concrete setting and hardening time, so that the whole concrete setting and hardening process is controllable, and the concrete heat release process is controllable.
2. The automatic temperature control device for the large-volume concrete can brake the water control system to regulate the water temperature by comparing the temperature difference of each water cooling system, so that the temperature of the internal structure of the concrete can be reduced, and the temperature of the surface of the concrete can be raised in a low-temperature environment; the temperature difference of the concrete can be controlled in real time under the condition of no need of manual action, and the temperature crack of the concrete is avoided as much as possible.
3. According to the automatic temperature control device for the large-volume concrete, the compression-resistant pipe adopts a cylindrical structure, so that stress concentration is reduced to the greatest extent, and the influence on the stress distribution condition of the main body of the concrete structure is reduced; the diameter of the section of the compression-resistant pipe can be adjusted 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 invention.
4. The automatic temperature control device for the mass concrete can be taken out after the whole concrete setting and hardening process is finished, is convenient to recycle and reuse, reduces the equipment manufacturing cost and reduces the project construction cost; on the other hand, the reserved holes can be used for burying the prestressed components by a post-tensioning method, and are also used as expansion joints through structural transformation. When the bearing capacity of the concrete structure is high, only the main body part members can be removed, and the compression-resistant steel pipes are reserved so as to meet the bearing capacity of the concrete structure.
Drawings
FIG. 1 is a basic construction diagram of the present invention;
FIG. 2 is a schematic diagram of the water cooling structure arrangement of the present invention.
Detailed Description
In order to solve the problem that automatic temperature control cannot be performed on concrete in the concrete pouring and curing process, the embodiment of the invention provides an automatic temperature control device suitable for mass concrete, which comprises a water cooling system main body, a temperature control system and a transmission structure.
The water cooling system main body comprises a compression-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 compression-resistant steel pipe 1; a closed medium cavity is formed between the compression-resistant steel pipe 1 and the PVC waterproof pipe 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 waterproof pipe 2. The compression-resistant steel pipe 1 is used for protecting the PVC waterproof pipe 2 from being damaged by concrete gravity and concrete expansion deformation extrusion; the PVC marine riser 2 serves to protect the temperature sensing element 3 from water.
The transmission structure 8 is mainly used for medium exchange in a medium cavity, the transmission structure 8 comprises a water inlet pipe 9 and a water outlet pipe 10, a proper amount of non-adaptive water cooling medium (temperature control medium) is discharged from the medium cavity through the water outlet pipe 10, a proper amount of adaptive 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 concrete is controlled to be proper.
The temperature control system comprises a temperature monitoring system 5, a hydraulic control system 7 and a braking system 6 accommodated between the two systems. The temperature control system 5 completes data transmission with the temperature sensing element 3 through the temperature control transmission structure 4 (a wired structure and a wireless structure can be selected according to the requirement), and meanwhile, the temperature monitoring system 5 monitors the environment temperature (the external environment where the concrete is located); the hydraulic control system 7 is communicated with the water cooling system through a water guide pipe 8 and is used for conveying water cooling medium (temperature control medium) between the compression-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 riser 1 Indirectly calculating the temperature t of a water-cooling medium (temperature control medium) 2 The method comprises the steps of carrying out a first treatment on the surface of the According to the heat balance principle, the uniform, isotropic temperature field satisfies the differential equation of the formula:
wherein, the temperature (DEG C) is the adiabatic temperature rise (DEG C) of the medium, and a is the thermal conductivity coefficient (m 2 ·h -1 ) T is time(s), τ is age (day). Because the heat conductivity coefficient of the air is 0.0267W/m.K at normal temperature (20 ℃), and the space in the PVC waterproof tube 2 is narrow, the heat can be rapidly transferred, namely t can be considered as 1 ≈t 2 。
Further, the temperature sensing element 3 is also responsive to the ambient temperature t 3 (the external environment temperature of the concrete) and inputting a water-cooling medium (temperature control medium) with the same temperature as the environment temperature through a water inlet pipe 9, namely t 2 ＝t 3 Therefore, the internal temperature of the concrete and the external temperature of the concrete are synchronously reduced and gradually approach to the ambient temperature, and the cracking of the concrete surface caused by overlarge temperature difference between the inside and the outside of the concrete in the process of pouring and curing the concrete is reduced.
It should be noted that if it is desired to accelerate the concrete temperature drop rate, the water inlet pipe 9 can also be fed with a water cooling medium (temperature control medium) slightly lower than the ambient temperature, i.e. t 2 <t 3 However, in this case, the temperature difference Δt=t should be reasonably controlled according to the concrete properties and the mixture ratio 3 -t 2 To avoid temperature cracks in the concrete (the outer wall of the compression-resistant steel pipe is adjacent to the concrete).
According to the basic principle of the elastic mechanics finite element method:
K i Δδ i ＝ΔP i G +ΔP i C +ΔP i T +ΔP i S
wherein: delta i 、ΔP i C 、ΔP i S 、ΔP i G And DeltaP i T Respectively representing node displacement increment, 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 on the domain, and experimental analysis shows that the node force increment caused by temperature differenceThe induced displacement increment delta i The largest, i.e. the temperature difference between the inside and outside of the concrete is an important factor causing temperature cracking.
By using the invention, the node force increment delta P caused by temperature difference can be effectively reduced by adjusting the arrangement positions and the arrangement quantity of the automatic temperature control devices i T The stress increment of each concrete unit is reduced, so that the probability of cracking of the concrete surface is greatly reduced.
As shown in fig. 2, in the concrete pouring process, according to 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 according to the requirement, and the arrangement and the assembly of other structural elements are completed. FIG. 2 shows a single-layer arrangement, wherein the device can also adopt multi-layer arrangement according to the thickness of a concrete pouring block in practical application; in addition, the casting mould can be uniformly arranged at equal intervals and non-uniformly arranged at unequal intervals according to the casting mould.
According to the automatic temperature control device, the compression-resistant steel pipe adopts a cylindrical structure, so that stress concentration is reduced to the greatest extent, and the influence on the stress distribution condition of the main body of the concrete structure is reduced; the diameter of the section of the steel pipe can be adjusted according to the conditions of the size of the component, the distribution density of the device and the like as required so as to increase the universality of the invention.
The automatic temperature control device can be taken out after the whole concrete setting and hardening process is finished, is convenient for recycling and reutilization, reduces the equipment manufacturing cost and reduces the project construction cost; on the other hand, the reserved holes can be used for burying the prestressed components by a post-tensioning method, and are also used as expansion joints through structural transformation. When the bearing capacity of the concrete structure is high, only the main body part members can be removed, and the compression-resistant steel pipes are reserved so as to meet the bearing capacity of the concrete structure.
According to the automatic temperature control device, when the temperature difference of each water cooling system is small, the digital signal generated by the temperature sensing element 3 only activates the temperature monitoring function of the temperature monitoring system 5 to detect whether the water temperature is reduced to a proper temperature or not so as to ensure whether the concrete temperature is proper or not and whether the concrete temperature is stable or not, if the temperature is high, the water guide pipe 8 keeps the water cooling medium (temperature control medium) input state, the concrete structure is continuously cooled, the water cooling medium (temperature control medium) is continuously discharged from the water inlet pipe 9 and the water outlet pipe 10, medium exchange (energy exchange caused by heat transfer) is formed, and the medium after temperature adjustment is recovered and cooled for recycling.
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 where 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 cooling, and perform proper temperature rising adjustment on the concrete water cooling unit with lower temperature so as to avoid temperature cracks caused by local temperature difference.
Therefore, the invention can realize real-time monitoring of the temperature of the mass concrete, so as to avoid overlarge local temperature difference and overlarge internal and external temperature difference of the concrete structure, monitor the temperature of the concrete, realize automatic temperature adjustment and solve the problem of cracks caused by overlarge temperature difference and temperature change of the concrete. Meanwhile, the structure is convenient, the size and the distribution are flexible, the arrangement is convenient, and the universality is high; the medium can be recycled, and is economical and environment-friendly; the equipment has low manufacturing cost, is convenient to disassemble and recycle, and can greatly save the cost; the equipment reserved holes have strong functionality and flexible upgrading and reconstruction.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various equivalent changes can be made to the technical solutions of the present invention within the scope of the technical concept of the present invention, and these equivalent changes all fall within the scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations of the invention are not described in detail in order to avoid unnecessary repetition.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (4)
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, and a data transmission structure (4) and a medium transmission structure (8) which are connected with the liquid cooling system main body and the temperature control system;
the liquid cooling system main body comprises a compression-resistant pipe (1), a liquid separation pipe (2) and a temperature sensing element (3), wherein the temperature sensing element (3) is arranged in the liquid separation pipe (2), the liquid separation pipe (2) is arranged in the compression-resistant pipe (1), and a closed medium cavity is formed between the compression-resistant pipe (1) and the liquid separation 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), wherein the temperature monitoring system (5) is in data communication with the temperature sensing element (3) through a data transmission structure (4), and the hydraulic control system (7) is in temperature control medium communication with the medium cavity through a medium transmission structure (8); the structure of the compression-resistant pipe (1) is a cylindrical structure; the medium transmission structure (8) comprises a water inlet pipe (9) and a water outlet pipe (10);
when the automatic temperature control is performed, the temperature monitoring system (5) compares the internal temperature signal of the concrete fed back by the temperature sensing element (3) with the external temperature signal monitored by the temperature monitoring system (5), calculates a temperature difference signal, outputs a temperature control signal and transmits a braking signal through the braking system (6); after the hydraulic control system (7) receives a braking signal through the braking system (6), the medium transmission structure (8) is controlled according to braking information to discharge a proper amount of non-temperature-adaptive temperature control medium from the medium cavity, and a proper amount of temperature-adaptive temperature control medium is input into the medium cavity, so that the internal temperature of the concrete and the external temperature of the concrete are synchronously reduced.
2. The automated mass concrete temperature control device of claim 1, wherein the temperature control medium is water.
3. The automated mass concrete temperature control device of claim 1, wherein the temperature of the temperature-compliant temperature control medium is equal to an ambient temperature.
4. The automatic mass concrete temperature control device according to claim 1, wherein the temperature t of the temperature-adaptive temperature control medium 2 Below ambient temperature t 3 The temperature difference is required to be reasonably controlled according to the concrete properties and the proportioning conditions△t=t 3 -t 2 。
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| CN202110632815.1A CN113213966B (en) | 2021-06-07 | 2021-06-07 | Automatic temperature control device for mass concrete |
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| CN202110632815.1A CN113213966B (en) | 2021-06-07 | 2021-06-07 | Automatic temperature control device for mass concrete |
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|---|---|---|---|---|
| KR20030017761A (en) * | 2001-08-22 | 2003-03-04 | 정순용 | Hydrate heat control method and its apparatus of mass concrete |
| CN205745831U (en) * | 2015-11-17 | 2016-11-30 | 辽宁铭阳管业股份有限公司 | A kind of insulating tube temperature control system |
| CN107989223A (en) * | 2017-12-20 | 2018-05-04 | 苏州市世好建材新技术工程有限公司 | Load-bearing aerated blocks assembled wall can be monitored |
| CN207526123U (en) * | 2017-10-11 | 2018-06-22 | 张启志 | A kind of new concrete intelligent temperature control device |
| CN112177000A (en) * | 2020-09-17 | 2021-01-05 | 宜昌天宇科技有限公司 | System and method for regulating and controlling temperature of concrete dam |
| CN214937079U (en) * | 2021-06-07 | 2021-11-30 | 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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- 2021-06-07 CN CN202110632815.1A patent/CN113213966B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030017761A (en) * | 2001-08-22 | 2003-03-04 | 정순용 | Hydrate heat control method and its apparatus of mass concrete |
| CN205745831U (en) * | 2015-11-17 | 2016-11-30 | 辽宁铭阳管业股份有限公司 | A kind of insulating tube temperature control system |
| CN207526123U (en) * | 2017-10-11 | 2018-06-22 | 张启志 | A kind of new concrete intelligent temperature control device |
| CN107989223A (en) * | 2017-12-20 | 2018-05-04 | 苏州市世好建材新技术工程有限公司 | Load-bearing aerated blocks assembled wall can be monitored |
| CN112177000A (en) * | 2020-09-17 | 2021-01-05 | 宜昌天宇科技有限公司 | System and method for regulating and controlling temperature of concrete dam |
| CN214937079U (en) * | 2021-06-07 | 2021-11-30 | 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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