CN107059874B - Concrete pouring structure based on heat pipe and cooling method for concrete structure pouring - Google Patents
Concrete pouring structure based on heat pipe and cooling method for concrete structure pouring Download PDFInfo
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- CN107059874B CN107059874B CN201710085311.6A CN201710085311A CN107059874B CN 107059874 B CN107059874 B CN 107059874B CN 201710085311 A CN201710085311 A CN 201710085311A CN 107059874 B CN107059874 B CN 107059874B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
Abstract
The invention belongs to the field of concrete pouring, and particularly provides a concrete pouring structure based on a heat pipe and a cooling method for concrete structure pouring. The invention aims to solve the problems that in the prior art, when large-volume concrete pouring is performed, hydration heat is eliminated through a large amount of water, water resources are wasted, and the problem is limited by environmental factors, and the problems that when hydration heat is eliminated through a layered vibration pouring method, the workload is large, the heat dissipation speed is low, and the concrete layering phenomenon is easy to occur are solved. To this end, the casting structure of the present invention includes a plurality of heat pipes secured to the rebar. According to the invention, one end of the heat pipe, which is far away from the steel bar, is embedded in the foundation, and then the other end of the heat pipe is poured, so that heat generated in the mass concrete structure is timely conducted into the foundation by the heat pipe in the pouring process. Therefore, the pouring structure not only can reduce the workload of removing the heat of hydration in the concrete pouring process, but also can improve the pouring speed of the concrete.
Description
Technical Field
The invention belongs to the field of concrete pouring, and particularly provides a concrete pouring structure based on a heat pipe and a cooling method for concrete structure pouring.
Background
With the development of society, concrete has become an indispensable building material. Concrete (particularly cement in concrete) can generate hydration reaction with water and release heat in the use process, and for particularly large-volume projects such as dams, piers, foundations and the like, the more the hydration heat is released, the more the hydration heat is accumulated, the more the hydration heat is released, the more the concrete is easy to expand and crack, and the destructive effect is caused.
At present, the main four types of relatively mature large-volume concrete pouring cooling methods are available. The first is to use galvanized iron pipe to assist flowing water, and set up a plurality of fin distributing plates on the outer wall of the iron pipe, set up a plurality of fins on the fin distributing plate, in order to increase the heat absorption and heat dissipation area of the iron pipe, and then can reduce the hydration heat inside the bulky concrete fast. And secondly, a temperature sensing element, a flow controller, a water storage tank, a heating and radiating controller and the like are connected with a temperature control system through a pre-buried cooling circulating water pipe, so that the automatic temperature control of the large-volume concrete construction is realized, and the purpose of reducing the hydration heat in the large-volume concrete is further achieved. Thirdly, a temperature difference controller is used for detecting the heat released during concrete pouring, and the hydration heat in the large-volume concrete is reduced through a connected conduit and a water pump. Fourthly, the hydration heat in the large-volume concrete is reduced by a layered vibration pouring method.
However, the first three methods are all to reduce the hydration heat in the large-volume concrete by water, which not only is the process complicated, but also has a large demand for water, and cannot be implemented in a place with a shortage of water resources, and if the water is recycled, the construction cost is greatly increased. The fourth method has a small demand for water, but has a high requirement for vibration, needs waiting for the initial setting time of concrete so as to control the layering position, and has a complex construction process, a large workload and a slow heat dissipation speed. If the initial setting time of the concrete is not well controlled, the concrete can be layered, which is a phenomenon that can be avoided in engineering construction.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problems of the prior art that water resources are wasted and the hydration heat is limited by environmental factors when the hydration heat is removed by using a large amount of water, and the problems of a large workload, a slow heat dissipation rate and a concrete layering phenomenon which is easily generated when the hydration heat is removed by using a layered vibration casting method, the present invention provides a concrete casting structure based on a heat pipe, the casting structure comprising: the concrete to be poured; a heat pipe having one end embedded in the concrete and the other end protruding from the concrete.
In a preferred technical solution of the above casting structure, the concrete casting structure includes a support member, and the heat pipe is fixedly connected with the support member.
In a preferred embodiment of the above cast structure, the concrete cast structure includes reinforcing bars, which serve as the support members.
In the preferable technical scheme of the pouring structure, the steel bar is fixedly connected with the heat pipe in a binding mode, or the steel bar is fixedly connected with the heat pipe in a welding mode.
In the preferable technical scheme of the pouring structure, the diameter of the heat pipe is 3-10 mm larger than that of the reinforcing steel bar.
In the preferable technical scheme of the pouring structure, the number of the heat pipes is multiple, and the heat pipes are uniformly distributed in the concrete.
In the preferable technical scheme of the pouring structure, the heat pipe is a carbon steel heat pipe.
The concrete pouring structure based on the heat pipe can efficiently conduct hydration heat generated in the concrete pouring process from one end of the heat pipe embedded in the concrete to the other end of the heat pipe extending out of the concrete, so that the phenomenon of expansion and cracking of the concrete caused by excessive accumulation of the hydration heat in the concrete is avoided, and water is not required to be consumed in the operation of the heat pipe, so that water resources can be saved.
In another aspect, the present invention further provides a cooling method for concrete structure pouring based on a heat pipe, wherein the cooling method comprises the following steps: selecting a heat pipe; fixing the heat pipe to a target position of concrete to be poured; and (6) pouring concrete.
In a preferred technical solution of the above cooling method, the step of "selecting a heat pipe" further includes: and selecting the heat pipes with corresponding specifications and/or the number of the heat pipes according to at least one of the volume of the concrete structure, the type of the concrete and the pouring speed of the concrete.
In a preferred technical solution of the above cooling method, the concrete structure includes a steel bar, and the step of fixing the heat pipe and the steel bar is performed before the step of fixing the heat pipe to a target position of concrete to be poured.
In the preferable technical scheme of the cooling method, the diameter of the heat pipe is 3-10 mm larger than that of the reinforcing steel bar.
In a preferred technical solution of the above cooling method, "fixing the heat pipe and the reinforcing steel bar" further includes: and fixing the heat pipe to the steel bar by welding or binding.
In a preferred technical solution of the above cooling method, the target position is a foundation, and the step of "fixing the heat pipe to the target position of the concrete to be poured" further includes: burying the heat pipe into the foundation.
In a preferred technical solution of the above cooling method, the foundation is a soil foundation.
In a preferred technical scheme of the cooling method, the heat pipe is a carbon steel heat pipe.
According to the cooling method for concrete structure pouring based on the heat pipe, the heat pipe is fixed to the target position, and then concrete pouring is carried out on the target position, so that hydration heat generated in the concrete pouring process can be timely and efficiently conducted out through the heat pipe. Because the heat pipe does not need to consume water in the working process, the cooling method can also save water resources, even in the environment without water resources, the hydration heat generated in the concrete pouring process can be conducted out in time through the cooling method, and the concrete cracking phenomenon caused by excessive internal hydration heat accumulation in the concrete pouring process is avoided.
the concrete to be poured;
a heat pipe having one end embedded in the concrete and the other end protruding from the concrete.
Scheme 6, according to scheme 1 the concrete placement structure based on heat pipe, characterized in that, the quantity of heat pipe is a plurality of, a plurality of heat pipes evenly distributed is in the concrete.
Scheme 7, the concrete placement structure based on heat pipe according to any one of schemes 1 to 6, characterized in that, the heat pipe is a carbon steel heat pipe.
Scheme 8, a cooling method for concrete structure pouring based on a heat pipe, which is characterized by comprising the following steps:
selecting a heat pipe;
fixing the heat pipe to a target position of concrete to be poured;
and (6) pouring concrete.
Scheme 9, the cooling method according to scheme 8, wherein the step of selecting a heat pipe further comprises:
and selecting the heat pipes with corresponding specifications and/or the number of the heat pipes according to at least one of the volume of the concrete structure, the type of the concrete and the pouring speed of the concrete.
The cooling method according to claim 10 or 8, wherein the concrete structure includes a reinforcing bar, and the step of fixing the heat pipe to the reinforcing bar is performed before the step of fixing the heat pipe to a target position of concrete to be poured.
Scheme 11, the cooling method according to scheme 10, wherein the diameter of the heat pipe is 3-10 mm larger than the diameter of the reinforcing steel bar.
Scheme 12, the cooling method according to claim 10, wherein the step of "fixing the heat pipe to the reinforcing bar" further comprises:
and fixing the heat pipe to the steel bar by welding or binding.
Solution 13 the cooling method according to solution 8, wherein the target location is a foundation,
the step of "fixing the heat pipe to a target position of concrete to be cast" further includes:
burying the heat pipe into the foundation.
The cooling method according to claim 14 or 13, wherein the foundation is a soil foundation.
Scheme 15, according to scheme 8 ~ 14 any one the cooling method, characterized in that, the heat pipe is carbon steel heat pipe.
Drawings
FIG. 1 is a schematic illustration of a heat pipe based mass concrete cast structure of the present invention, illustrated as a concrete cast foundation;
FIG. 2 is a cross-sectional view of a heat pipe based mass concrete cast structure of the present invention taken on a concrete cast foundation as an example, taken along the direction C-C in FIG. 1;
FIG. 3 is a flowchart illustrating steps of a method for cooling a large volume concrete structure cast by a heat pipe according to an embodiment of the present invention;
fig. 4 is a schematic diagram of the hydration heat conduction method for cooling down the casting of a mass concrete structure based on heat pipes according to the embodiment of the present invention.
List of reference numerals:
1. reinforcing steel bars; 2. a carbon steel heat pipe; 3. a concrete foundation; 4. a concrete cushion; 5. and (3) soil.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, although carbon steel heat pipes are used as an example to describe the method for cooling a mass concrete structure cast by heat pipes of the present invention, it is obvious that other heat pipes, such as copper heat pipes, can be used in the method for cooling of the present invention, and those skilled in the art can adjust the method as required to suit the specific application.
The heat pipe is a heat transfer element with extremely high heat conductivity, transfers heat by evaporation and condensation of liquid in the totally-enclosed vacuum pipe, and plays a role similar to refrigeration of a refrigerator compressor by utilizing fluid principles such as capillary action and the like. The heat conduction type constant-temperature heat pipe has a series of advantages of high heat conductivity, excellent isothermal property, heat flow density variability, reversibility of heat flow direction, remote heat transfer, constant-temperature property (controllable heat pipe), thermal diode performance, thermal switch performance and the like.
The concrete pouring structure based on the heat pipe is particularly suitable for large-volume concrete pouring structures and mainly comprises poured concrete, reinforcing steel bars and the heat pipe, wherein the heat pipe is fixedly connected with the reinforcing steel bars into an integral structure in a welding or binding mode. Further, the heat pipes are preferably carbon steel heat pipes in order to reduce the cost of the cast structure. Furthermore, the steel bars can be uniformly arranged steel bar groups or fixed into an integral steel bar cage according to actual engineering requirements, or other devices or materials can be selected by a person skilled in the art according to requirements to be fixedly connected with the carbon steel heat pipes, and the steel bars can be used as supporting pieces of the carbon steel heat pipes to prevent the carbon steel heat pipes from moving due to the acting force of concrete when the carbon steel heat pipes are poured by the concrete.
Further, before the mass concrete structure is poured, the carbon steel heat pipes and the steel bars connected into an integral structure are buried in the foundation. Specifically, one end of the carbon steel heat pipe is embedded in the foundation, and the carbon steel heat pipe is embedded as deeply as possible under allowable conditions, so that the contact area between the carbon steel heat pipe and the foundation is increased, and the heat dissipation efficiency of the carbon steel heat pipe is further improved.
The heat pipe-based mass concrete cast structure of the present invention will be described in detail with reference to the reinforced concrete foundation columns shown in fig. 1 and 2.
As shown in fig. 1 and 2, a steel bar 1 is fixedly connected to an upper portion of a carbon steel heat pipe 2, and a lower portion of the carbon steel heat pipe 2 is deeply buried in a ground (soil 5 shown in fig. 1). In order to increase the stability of the reinforced concrete foundation column, a concrete foundation 3 is arranged at the lower end of the reinforced concrete foundation column, and further, in order to increase the flatness between the concrete foundation 3 and the soil 5, a concrete cushion 4 is arranged between the concrete foundation 3 and the soil 5.
With further reference to fig. 1 and 2, the carbon steel heat pipes 2 are uniformly distributed inside the reinforced concrete foundation column so that hydration heat generated during the casting of the reinforced concrete foundation column can be timely conducted to the soil 5 with a minimum number of carbon steel heat pipes 2.
Further, as shown in fig. 3, the method for cooling down a large-volume concrete structure cast by using a heat pipe of the present invention mainly comprises: step S100, selecting a heat pipe; step S200, fixing the heat pipe on the steel bar; step S300, fixing the heat pipe and the steel bar on the foundation together; and S400, pouring concrete.
Specifically, in step S100, heat pipes of different specifications and the number thereof are selected according to different projects. More specifically, the specification and the number of the heat pipes are determined according to the volume of concrete in the project, the speed of hydration heat generation during pouring and the total hydration heat. Further, the rate of generation of hydration heat and the total amount of hydration heat at the time of concrete casting may be obtained according to at least one of the volume of the concrete structure, the kind of concrete, and the casting speed of concrete. The heat pipes are preferably carbon steel heat pipes so as to reduce the use cost of the heat pipes, or those skilled in the art can select heat pipes of other specifications according to actual needs, such as copper heat pipes. In addition, the diameter of the carbon steel heat pipe is preferably larger than the diameter of the steel bar by 3-10 mm for fixing the carbon steel heat pipe (see the following text for details), or the carbon steel heat pipe with other diameter can be selected by the skilled person according to the actual requirement, such as the carbon steel heat pipe smaller than the diameter of the steel bar.
Specifically, in step S200, the carbon steel heat pipe is fixed to the steel bar by welding or binding (binding), or a person skilled in the art may fix the carbon steel heat pipe and the steel bar by other connection methods according to the actual situation, for example, a fastener is disposed on the carbon steel heat pipe, and the carbon steel heat pipe is fastened to the steel bar by a fastener. Further, in order to improve the heat absorption efficiency of the carbon steel heat pipes, all the carbon steel heat pipes are uniformly distributed in the concrete structure, preferably, at most one carbon steel heat pipe is fixed on each reinforcing steel bar, and when the number of the carbon steel heat pipes exceeds the number of the reinforcing steel bars, the carbon steel heat pipes can be fixed between the reinforcing steel bars in other ways, for example, one reinforcing steel bar is transversely arranged between two reinforcing steel bars, and the carbon steel heat pipes are fixed on the reinforcing steel bars of the transverse frame. It will be appreciated by those skilled in the art that in actual construction, the rebar will typically be in the form of a rebar cage or rebar grid.
Specifically, in step S300, the end of the carbon steel heat pipe away from the steel bar is embedded in the foundation together with the steel bar, and it is easily understood by those skilled in the art that the foundation is usually a soil foundation during the actual construction process. It will also be understood by those skilled in the art that the carbon steel heat pipes and the steel bars may be vertically embedded in the foundation, or may be obliquely or horizontally embedded in the foundation.
Specifically, in step S400, after the carbon steel heat pipes and the steel bars are embedded and fixed in the foundation, concrete is poured on the carbon steel heat pipes and the steel bars exposed outside the foundation and the periphery thereof. The heat generated by internal hydration in the concrete pouring process can be conducted into the foundation through the carbon steel heat pipe.
The operation principle of the method for cooling down a large-volume concrete structure cast by using a heat pipe according to the present invention will be described in detail with reference to fig. 4.
As shown in fig. 4, when a steel reinforcement cage bound with heat pipes is cast with concrete, a large amount of heat is generated due to hydration of the concrete, and especially for a large-volume concrete structure, if the internal heat is not dissipated in time, the concrete structure is expanded and cracked, and the quality of the concrete structure is affected. Further, a small part of heat generated by hydration is dissipated to the air through the surface of the concrete structure, and a large part of heat generated by hydration is conducted to the foundation through the carbon steel heat pipe. Therefore, the carbon steel heat pipe can efficiently and timely conduct away hydration heat generated in the concrete structure, and the phenomenon that the quality of the concrete structure is reduced due to expansion and cracking of the concrete structure caused by overhigh internal heat is avoided.
In the preferred embodiment of the invention, the interior of the concrete structure is communicated with the foundation through the heat pipe, so that the hydration heat generated inside the concrete in the pouring process can be timely and efficiently conducted into the foundation, the workload of eliminating the hydration heat in the concrete pouring process is reduced, the pouring efficiency of the concrete is improved, and no additional water resource is consumed.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (14)
1. A cooling method for concrete structure pouring based on a heat pipe is characterized by comprising the following steps:
selecting a heat pipe;
burying one end of the heat pipe into the foundation so that the other end thereof is exposed to the outside;
arranging a concrete cushion on the foundation;
concrete is poured on the concrete pad so that the heat pipes exposed to the outside are buried in the concrete.
2. The method of claim 1, wherein the step of selecting a heat pipe further comprises:
and selecting the heat pipes with corresponding specifications and/or the number of the heat pipes according to at least one of the volume of the concrete structure, the type of the concrete and the pouring speed of the concrete.
3. The cooling method as claimed in claim 1, wherein the concrete structure comprises a reinforcing bar, and the step of fixing the heat pipe to the reinforcing bar is performed before the step of burying one end of the heat pipe in a ground so that the other end thereof is exposed to the outside.
4. The cooling method according to claim 3, wherein the diameter of the heat pipe is 3 to 10mm larger than the diameter of the steel bar.
5. The method of claim 3, wherein the step of fixing the heat pipe to the reinforcement bar further comprises:
and fixing the heat pipe to the steel bar by welding or binding.
6. The method of claim 1, wherein the foundation is a soil foundation.
7. The method of reducing temperature according to any one of claims 1 to 6, wherein the heat pipe is a carbon steel heat pipe.
8. A concrete placement structure based on a heat pipe, characterized in that the concrete placement structure comprises:
the concrete to be poured;
a concrete pad disposed between the concrete and a foundation;
a heat pipe having one end embedded in the concrete and the other end extending out of the concrete and embedded in the foundation through the concrete pad;
the concrete pouring structure is obtained by adopting the cooling method of claim 1.
9. A heat pipe-based concrete cast structure according to claim 8, characterized in that said concrete cast structure comprises a support, said heat pipe being fixedly connected with said support.
10. A heat pipe based concrete cast structure as claimed in claim 9, wherein said concrete cast structure includes reinforcing bars, said reinforcing bars serving as said support members.
11. A heat pipe-based concrete cast structure according to claim 10, wherein said reinforcing bars are fixedly connected with said heat pipes by means of binding, or said reinforcing bars are fixedly connected with said heat pipes by means of welding.
12. A heat pipe-based concrete cast structure as claimed in claim 10, wherein the diameter of the heat pipe is 3 to 10mm larger than the diameter of the reinforcing bar.
13. A heat pipe based concrete cast structure as claimed in claim 8, wherein said heat pipe is plural in number, and said plural heat pipes are uniformly distributed inside said concrete.
14. A heat pipe-based concrete cast structure according to any one of claims 8 to 13, wherein said heat pipe is a carbon steel heat pipe.
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| CN201710085311.6A CN107059874B (en) | 2017-02-17 | 2017-02-17 | Concrete pouring structure based on heat pipe and cooling method for concrete structure pouring |
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| CN201710085311.6A CN107059874B (en) | 2017-02-17 | 2017-02-17 | Concrete pouring structure based on heat pipe and cooling method for concrete structure pouring |
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| CN107059874B true CN107059874B (en) | 2022-10-18 |
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| CN2599513Y (en) * | 2003-01-21 | 2004-01-14 | 刘庸 | Corrosion-proof heat pipe |
| US9103603B2 (en) * | 2009-10-28 | 2015-08-11 | Tai-Her Yang | Thermal conductive cylinder installed with U-type core piping and loop piping |
| CN105113489B (en) * | 2015-08-20 | 2017-02-22 | 中国科学院寒区旱区环境与工程研究所 | Method of reducing concrete hydration heat of cast-in-place pile in permafrost region |
| CN206562615U (en) * | 2017-02-17 | 2017-10-17 | 河南城建学院 | Concrete pouring structure based on heat pipe |
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