CN108425504B - Temperature control device and method in large-volume concrete construction process - Google Patents
Temperature control device and method in large-volume concrete construction process Download PDFInfo
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- CN108425504B CN108425504B CN201810474836.3A CN201810474836A CN108425504B CN 108425504 B CN108425504 B CN 108425504B CN 201810474836 A CN201810474836 A CN 201810474836A CN 108425504 B CN108425504 B CN 108425504B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/24—Safety or protective measures preventing damage to building parts or finishing work during construction
- E04G21/246—Safety or protective measures preventing damage to building parts or finishing work during construction specially adapted for curing concrete in situ, e.g. by covering it with protective sheets
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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
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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
- C04B40/0082—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 rise in temperature, e.g. caused by an exothermic reaction
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
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- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention discloses a temperature control device and a method in the construction process of mass concrete, which solve the problem of concrete cracking caused by large internal and external temperature difference in the construction process of mass concrete in winter, and transfer the heat of the internal concrete to the external concrete through a heat conduction device, so that the internal and external temperature difference of the mass concrete can be effectively reduced while the stability of the concrete structure is ensured, the heat generated by hydration is reasonably utilized, and the heat waste is avoided, and the technical scheme is as follows: the heat conducting pipe is sealed at the bottom, the top of the heat conducting pipe is opened, the top of the heat conducting pipe is connected with the sealing cover, and the sealing cover seals the heat conducting pipe; the sealing cover is provided with a through hole communicated with the heat conduction pipe, a joint is arranged at the through hole, and liquid working medium is introduced or recovered into the heat conduction pipe through the joint.
Description
Technical Field
The invention relates to the technical field of mass concrete construction in winter, in particular to a temperature control device and a temperature control method in the mass concrete construction process.
Background
In recent years, along with the continuous development of the construction technology of China, the use of mass concrete is becoming more and more common. However, the temperature difference between the inside and the outside of the concrete caused by the hydration heat of the mass concrete and the too slow internal heat dissipation causes larger tensile stress on the surface of the concrete, and when the generated tensile stress is larger than the tensile strength of the concrete, the mass concrete can be cracked during early maintenance. Because the winter air temperature in the north of China is lower, the problem is more obvious in the winter concrete construction in the north of China.
At present, in winter construction of large-volume concrete in the north, besides stepwise construction, main measures are taken to absorb heat generated by hydration heat in the concrete through internal water circulation of a cooling water pipe, and heat preservation is carried out on the outside of the concrete by using a coating film or a heat preservation template and the like. However, in order to ensure the stability of the concrete structure, the cooling water pipes cannot be laid too densely; because the heat transfer performance of water is low, the expected target cannot be well achieved and the waste of water resources is caused; the heat absorbed by the cooling water pipe is discharged to the outside, and the external concrete for winter construction needs to be insulated, which makes the heat that can be utilized originally wasted.
In summary, in the prior art, an effective solution to the problem of concrete cracking caused by large internal and external temperature differences during the construction of mass concrete in winter is not available.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the temperature control device in the construction process of the mass concrete, which transfers the heat of the interior concrete to the exterior concrete through the heat conduction device, so that the temperature difference between the interior and the exterior of the mass concrete can be effectively reduced while the stability of the concrete structure is ensured, the heat generated by hydration heat is reasonably utilized, and the heat waste is avoided.
The invention adopts the following technical scheme:
the temperature control device in the construction process of the mass concrete comprises a heat conduction pipe, wherein the bottom of the heat conduction pipe is sealed, the top of the heat conduction pipe is opened, and the top of the heat conduction pipe is connected with a sealing cover which seals the heat conduction pipe; the sealing cover is provided with a through hole communicated with the heat conduction pipe, a joint is arranged at the through hole, and liquid working medium is introduced or recovered into the heat conduction pipe through the joint.
Further, the heat conduction pipe is formed by connecting an upper heat dissipation section and a lower heat absorption section, and the sectional area of the upper heat dissipation section is larger than that of the lower heat absorption section.
Further, the upper heat-dissipating section and the lower heat-absorbing section are of an integral structure.
Further, the sealing cover is detachably connected with the heat conducting pipe.
Further, the inner side wall of the upper heat dissipation section of the heat conduction pipe is provided with threads, the bottom of the sealing cover is provided with an external thread connecting piece, and the upper heat dissipation section is connected with the external thread connecting piece.
Further, a sealing element is arranged between the sealing cover and the heat conducting pipe.
Further, the bottom of the sealing cover is connected with a guide pipe, the top of the guide pipe corresponds to the through hole of the sealing cover, and the bottom of the guide pipe extends to the bottom of the heat conducting pipe.
Furthermore, an automatic pressure relief valve is arranged at the top of the sealing cover to relieve pressure of the heat conduction pipe.
Further, the joint is connected with an air pump or a liquid storage tank or a liquid collecting pump.
In order to overcome the defects of the prior art, the invention provides a temperature control method of a temperature control device in the construction process of mass concrete, which comprises the following steps:
step 1: the method comprises the steps of determining the sizes of an upper heat-radiating section and a lower heat-absorbing section of a heat-conducting pipe, the liquid filling amount of working media, the arrangement quantity and the interval of temperature control devices according to the size of mass concrete needing to be subjected to temperature control on site;
step 2: assembling a temperature control device, connecting an air pump with the joint, pumping out air in the heat conduction pipe, and checking whether air leakage exists or not;
step 3: coating heat-conducting silicone grease on the surface of the heat-conducting pipe, binding a temperature control device on a steel bar of concrete to be poured, and enabling the sealing cover to be higher than the concrete pouring design elevation;
step 4: pouring concrete, connecting a liquid storage tank with working medium and a joint, and pouring a set amount of working medium into a heat conducting pipe to realize heat transfer between the internal concrete and the external concrete;
step 5: after heat transfer is completed, connecting the liquid collecting pump with the joint, and extracting liquid working medium in the heat conducting pipe;
step 6: disconnecting the sealing cover from the heat conducting pipe, and taking out the sealing cover for storage; and (5) pouring concrete into the heat-conducting pipe and curing.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the internal and external temperature difference of the mass concrete is utilized to enable the working medium in the heat-conducting pipe to generate phase change circulation from liquid to gas to liquid, heat in the mass concrete is continuously transferred to the working medium in the heat-conducting pipe through the lower heat absorption section, and after the heat is evaporated to the upper end of the heat-conducting pipe along with the working medium, the heat is quickly transferred to external concrete through the larger heat dissipation area of the heat dissipation section, so that the cooling and external heat preservation of the mass concrete in winter are realized.
2. The heat generated by the hydration heat of the concrete is reasonably utilized while the temperature difference between the inside and the outside is reduced, the waste of energy sources, especially the saving of electric power and water resources, is not caused, no starting equipment is needed, and no noise is generated.
3. Because the heat-conducting pipe has higher heat-conducting property, the temperature difference between the inside and the outside of the mass concrete can be controlled within an allowable range in a shorter time, so that the maximum limit temperature and the maximum limit temperature difference can meet the standard requirements in a shorter time, and the concrete curing time is shortened.
4. The working medium and the sealing cover can be recycled, so that resource waste is avoided; the heat conduction pipe remained in the concrete and the concrete poured in the heat conduction pipe at the later stage can reduce the influence of the heat dissipation channel on the concrete structure and even play a certain reinforcing role on the structure stability.
5. An automatic pressure relief valve is designed for the sealing cover, and can automatically relieve pressure when the inside of the heat conducting pipe is over-high in pressure so as to ensure the safety of the whole device in the use process.
6. The arrangement position and the mode are flexible, the device size can be designed according to the requirement, and the device can be placed at the required position, whether the device is a top surface or a side surface.
7. The whole shape design of the invention can not cause the concrete to vibrate and not be solid; the upper heat dissipation section is thicker, so that concrete can be conveniently poured into the heat conduction pipe in the later period, and the heat dissipation area is increased.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application.
FIG. 1 is a schematic diagram of a temperature control apparatus of the present invention;
FIG. 2 is a schematic view of a seal cap and corresponding component arrangement;
FIG. 3 is a schematic view of a heat pipe;
FIG. 4 is a schematic view of the temperature control device according to the present invention;
in the figure, 1, an automatic pressure relief valve, 2, a connector, 3, a sealing cover, 4, an upper heat-radiating section, 5, a lower heat-radiating section, 6, a conduit, 7, mass concrete and 8, a heat conducting pipe.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
As described in the background art, the problem of concrete cracking caused by large internal and external temperature difference during the construction of mass concrete in winter exists in the prior art, and in order to solve the technical problems, the application provides a temperature control device and a temperature control method in the construction process of mass concrete.
In an exemplary embodiment of the present application, as shown in fig. 1 to 3, a temperature control device in a large-volume concrete construction process is provided, which includes a heat conduction pipe 8, a bottom seal of the heat conduction pipe 8, an opening at a top of the heat conduction pipe 8, and a sealing cover 3 connected with the top of the heat conduction pipe 8 to seal the heat conduction pipe 8 by the sealing cover 3; the sealing cover 3 is provided with a through hole communicated with the heat conducting pipe 8, a joint 2 is arranged at the through hole, and liquid working medium is introduced or recovered into the heat conducting pipe 8 through the joint 2.
The heat conducting pipe 8 is formed by connecting an upper heat radiating section 4 and a lower heat absorbing section 5, and the cross section area of the upper heat radiating section 4 is larger than that of the lower heat absorbing section 5, so that the heat radiating area of the upper heat radiating section can be increased.
The upper heat dissipation section 4 and the lower heat absorption section 5 are of an integrated structure.
The heat pipe 8 is mainly used as a heat transfer medium between the liquid working medium and the mass of concrete, as well as a working container for the working medium. The liquid working medium is filled into the heat-conducting pipe, heat transfer is carried out between the liquid working medium and the mass concrete through the heat-conducting pipe, the liquid working medium of the lower heat-absorbing section absorbs heat in the mass concrete, and then the heat is transferred to the liquid working medium of the upper heat-dissipating section, and the heat is dissipated to the outside of the mass concrete in the upper heat-dissipating section, so that the temperature difference between the inside and outside of the concrete is reduced. In addition, the heat-conducting pipe becomes a part of the mass concrete structure after later internal grouting. The shape design is beneficial to later grouting and can increase the heat dissipation area of the upper part.
The sealing cover 3 is detachably connected with the heat conducting pipe 8. The sealing cover is used for sealing the heat-conducting pipe, and can be disconnected with the heat-conducting pipe in the later period, and taken out of the heat-conducting pipe for recycling.
The inner side wall of the upper heat dissipation section 4 of the heat conduction pipe 8 is provided with threads, the bottom of the sealing cover 3 is provided with an external thread connecting piece, and the upper heat dissipation section 4 is connected with the external thread connecting piece.
A sealing element is arranged between the sealing cover 3 and the heat conducting pipe 8, and the sealing element can adopt a sealing rubber ring.
The bottom of the sealing cover 3 is connected with a guide pipe 6, the top of the guide pipe 6 corresponds to the through hole of the sealing cover 3, the bottom of the guide pipe 6 extends to the bottom of the heat conducting pipe 8, and the guide pipe is mainly used for fully extracting working medium at the bottom of the heat conducting pipe in the later period.
An automatic pressure relief valve 1 is arranged at the top of the sealing cover 3 to relieve the pressure of the air in the heat conducting pipe 8. When the air pressure in the heat conducting pipe is too high, the pressure is relieved through the automatic pressure relief valve, so that safety is ensured.
Sealing cover, joint, automatic relief valve, pipe welded connection, with the heat pipe cooperation, make the airtight and can pour into, retrieve working medium to the device inside as required of whole device to guarantee safety.
The joint 2 is connected with an air pump or a liquid storage tank or a liquid collecting pump. The joint 2 is used for exhausting, filling liquid working medium and recovering the liquid working medium. The liquid working medium in this application adopts a low boiling point liquid working medium, for example: liquid ammonia. The joint 2 is connected with an air extracting pump to extract air in the heat conducting pipe; the joint 2 is connected with the liquid storage tank, and working medium is filled into the heat conduction pipe; the joint 2 is connected with a liquid collecting pump, and after the temperature control is finished, working medium is pumped out and stored.
The device of this application except the heat pipe, other parts all can reuse, and liquid working medium also can retrieve again and carry out reuse.
In another exemplary embodiment of the present application, there is provided a temperature control method of a temperature control device in a mass concrete construction process, including the steps of:
step 1: the method comprises the steps of determining the sizes of an upper heat-radiating section and a lower heat-absorbing section of a heat-conducting pipe, the liquid filling amount of working media, the arrangement quantity and the interval of temperature control devices according to the size of mass concrete needing to be subjected to temperature control on site;
step 2: assembling a temperature control device, connecting an air pump with the joint, pumping out air in the heat conduction pipe, and checking whether air leakage exists or not;
step 3: coating heat-conducting silicone grease on the surface of the heat-conducting pipe, binding a temperature control device on a steel bar of concrete to be poured, enabling the sealing cover to be higher than the concrete pouring design elevation, ensuring that the upper end of the sealing cover is slightly higher than a future concrete protection layer, and taking certain measures to prevent the sealing cover from being buried in concrete during pouring;
step 4: after pouring, connecting a liquid storage tank with a joint, and pouring a set amount of liquid working medium into the heat conducting pipe to realize heat transfer between the internal concrete and the external concrete;
step 5: after heat transfer is completed, when the concrete does not need to be subjected to temperature control, the liquid collecting pump is connected with the joint, and the liquid working medium in the heat conducting pipe is pumped out for the next cycle use;
step 6: disconnecting the sealing cover from the heat conducting pipe, and screwing out the sealing cover by using a wrench for storage so as to be recycled next time; and (3) pouring concrete into the heat conduction pipe, and adopting a certain curing method to perform proper curing.
Through the steps, the internal temperature of the mass concrete is reduced, the external concrete temperature is improved, the effect of reducing the temperature difference between the interior and the exterior of the mass concrete in winter is achieved, the recycling of the heat conducting rod is realized, and the influence on the concrete structure is reduced.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these methods of use will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (9)
1. A temperature control method of a temperature control device in the construction process of mass concrete is characterized in that,
the temperature control device comprises a heat conduction pipe, wherein the bottom of the heat conduction pipe is sealed, the top of the heat conduction pipe is opened, the top of the heat conduction pipe is connected with a sealing cover, and the heat conduction pipe is sealed by the sealing cover; the sealing cover is provided with a through hole communicated with the heat conduction pipe, a joint is arranged at the through hole, and liquid working medium is introduced or recovered into the heat conduction pipe through the joint;
the temperature control method comprises the following steps:
step 1: the method comprises the steps of determining the sizes of an upper heat-radiating section and a lower heat-absorbing section of a heat-conducting pipe, the liquid filling amount of working media, the arrangement quantity and the interval of temperature control devices according to the size of mass concrete needing to be subjected to temperature control on site;
step 2: assembling a temperature control device, connecting an air pump with the joint, pumping out air in the heat conduction pipe, and checking whether air leakage exists or not;
step 3: coating heat-conducting silicone grease on the surface of the heat-conducting pipe, binding a temperature control device on a steel bar of concrete to be poured, and enabling the sealing cover to be higher than the concrete pouring design elevation;
step 4: pouring concrete, namely connecting a liquid storage tank with a joint, and pouring a set amount of liquid working medium into a heat conducting pipe to realize heat transfer between the internal concrete and the external concrete;
step 5: after heat transfer is completed, connecting the liquid collecting pump with the joint, and extracting liquid working medium in the heat conducting pipe;
step 6: disconnecting the sealing cover from the heat conducting pipe, and taking out the sealing cover for storage; and (5) pouring concrete into the heat-conducting pipe and curing.
2. The method of claim 1, wherein the heat pipe is formed by connecting an upper heat-dissipating section and a lower heat-absorbing section, and a cross-sectional area of the upper heat-dissipating section is larger than a cross-sectional area of the lower heat-absorbing section.
3. The method of temperature control of claim 2, wherein the upper and lower heat sink sections are of unitary construction.
4. The method of claim 1, wherein the sealing cover is detachably connected to the heat pipe.
5. The method of claim 4, wherein the inner side wall of the upper heat dissipation section of the heat pipe is provided with threads, the bottom of the sealing cover is provided with an external thread connecting piece, and the upper heat dissipation section is connected with the external thread connecting piece.
6. The method of claim 1, wherein a sealing member is provided between the sealing cover and the heat pipe.
7. The method of claim 1, wherein the sealing cover has a duct connected to the bottom thereof, and the duct has a top corresponding to the through hole of the sealing cover and a bottom extending to the bottom of the heat transfer pipe.
8. The method for controlling temperature according to claim 1, wherein an automatic pressure release valve is arranged at the top of the sealing cover to release pressure of the heat conducting pipe.
9. A method of controlling temperature according to claim 1, wherein the connector is connected to a pump or reservoir or a liquid pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810474836.3A CN108425504B (en) | 2018-05-17 | 2018-05-17 | Temperature control device and method in large-volume concrete construction process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810474836.3A CN108425504B (en) | 2018-05-17 | 2018-05-17 | Temperature control device and method in large-volume concrete construction process |
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| CN108425504A CN108425504A (en) | 2018-08-21 |
| CN108425504B true CN108425504B (en) | 2023-04-28 |
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| CN110184935A (en) * | 2019-06-05 | 2019-08-30 | 中交武汉港湾工程设计研究院有限公司 | A kind of cooling device and its construction method for high tower cast-in-place concrete construction |
| CN112412047B (en) * | 2020-10-15 | 2022-02-01 | 中国水利水电第九工程局有限公司 | Self-heating vibrating rod for concrete tamping drum |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2006052588A (en) * | 2004-08-12 | 2006-02-23 | Nippon Steel Corp | Pile with underground heat exchanging outer pipe, and method of constructing underground heat exchanger using the pile |
| DE102012001987A1 (en) * | 2011-10-05 | 2013-04-11 | comfort-clima GmbH | Heat conducting pipe for thermal applications, has heating or cooling energy transporting medium flowing inside pipe to produce heat or cold for rooms or areas of building |
| CN102995627B (en) * | 2012-11-22 | 2015-04-08 | 河海大学 | Geothermal energy collecting pile foundation |
| CN206329052U (en) * | 2016-12-06 | 2017-07-14 | 昆明天策节能科技有限公司 | A kind of fast cooling device of concrete |
| CN206326727U (en) * | 2016-12-06 | 2017-07-14 | 昆明天策节能科技有限公司 | A kind of separating concrete cooler |
| CN208202619U (en) * | 2018-05-17 | 2018-12-07 | 山东大学 | A kind of temperature control equipment in Mass Concrete |
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