JP2022178917A - Temperature control device for concrete - Google Patents

Abstract

To solve the problem of a conventional temperature control device for concrete that a wick is arranged in a heat pipe and a working fluid is upward moved by a capillary phenomenon so as to make a heat-absorbing characteristic poor.SOLUTION: A temperature control device for concrete includes mainly: a void pipe 12 arranged inside a concrete structure 11; a liquid 13 stored inside the void pipe 12; and a heat pipe 14 inserted into the void pipe 12. The heat pipe 14 is formed with a storage space 23 of a working fluid 24 between an external pipe 21 and an internal pipe 22 without using a wick. With the configuration, the storage space 23 is formed up to the upper side of the heat pipe 14, and the central part of the concrete structure 11 and its peripheral region are actively cooled so as to prevent cracks of the concrete structure 11.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a temperature control device for concrete that releases heat of hydration generated in the process of constructing a concrete structure, and in particular, a working fluid is applied in advance along the inner surface of an outer pipe without using a wick. The present invention relates to a temperature control device for concrete that is arranged to improve the heat dissipation characteristics of a heat pipe.

As a conventional concrete temperature control device 100 (hereinafter referred to as "temperature control device 100"), the structure shown in FIG. 6 is known. FIG. 6 is a cross-sectional view for explaining how the conventional temperature control device 100 is used.

As shown in FIG. 6, the temperature control device 100 mainly includes a void pipe 102 forming a hole in a concrete structure 101, a heat pipe 103 at least partially inserted into the void pipe 102, and a void pipe 103. and pore water 104 injected into the tube 102 .

The heat pipe 103 mainly includes a metal pipe 105 , a capillary structure wick 106 provided on the inner wall of the metal pipe 105 , and a working fluid 107 stored in the metal pipe 105 . In the space inside the wick 106, a conducting space 108 is formed through which the vapor of the vaporized working fluid 107 passes.

As illustrated, the heat pipe 103 is inserted into the void pipe 102 into which the interstitial water 104 is injected during curing of the placed concrete. At this time, bottom surface 105A of metal pipe 105 of heat pipe 103 is in contact with bottom surface 102A of void tube 102 . Then, the heat pipe 103 is erected inside the void tube 102 .

Here, the heat pipe 103 has a high-temperature portion 103A located on the lower side and in the storage region of the working fluid 107, a low-temperature portion 103B on the upper side and located outside the concrete structure 101, and a low-temperature portion 103B located therebetween. and a heat insulating portion 103C located. The high-temperature portion 103A of the heat pipe 103 absorbs the heat of hydration H1 generated when the concrete hardens, and vaporizes the working fluid 107 into steam. On the other hand, the low-temperature part 103B of the heat pipe 103 radiates the latent heat H2 in the vapor to the outside to liquefy the working fluid 107. As shown in FIG. The liquefied working fluid 107 passes through the wick 106, moves to the high temperature portion 103A, and is stored on the bottom side of the metal pipe 105. As shown in FIG.

As described above, the phase change cycle of the working fluid 107 is repeated in the metal pipe 105 of the heat pipe 103, thereby absorbing the heat of hydration H1 into the heat pipe 103 and The latent heat H2 is released to the outside of the concrete structure (see, for example, Patent Document 1).

Japanese Patent No. 6181436

As described above, the high-temperature portion 103A of the heat pipe 103 absorbs the heat of hydration H1, and the heat vaporizes the working fluid 107 into vapor. On the other hand, in the heat insulating portion 103C of the heat pipe 103, although a small amount of the working fluid 107 is sucked into the wick 106 by capillary action, the heat insulating structure does not absorb the heat of hydration H1, and the working fluid 107 does not vaporize.

Here, if the heat pipe 103 does not absorb the heat of hydration H1, the internal temperature of the concrete structure 101 rises, for example, to about 80 degrees at the high temperature location. In other words, although the heat of hydration H1 causes cracks in the concrete structure 101, it is not high enough to quickly vaporize the large amount of stored working fluid 107. FIG.

As a result, since a large amount of the working fluid 107 is stored around the high temperature portion 103A of the heat pipe 103, it takes time to raise the temperature of the stored working fluid 107 by the hydration heat H1 and vaporize it. However, there is a problem that the heat pipe 103 is inefficient and its heat absorption characteristic is also poor.

In particular, in the concrete structure 101, the central portion in the thickness direction tends to be in a high temperature state due to the hydration heat H1 rather than the vicinity of the bottom portion. However, in the structure in which the heat pipe 103 is erected on the bottom surface 102A of the void tube 102, the heat insulating portion 103C of the heat pipe 103 is positioned at the center portion of the concrete structure 101, so that the hydration There is a problem that it becomes difficult to absorb the heat H1, and it is difficult to cool the high-temperature region of the concrete structure 101 and cure it appropriately.

The present invention has been made in view of the above circumstances, and the temperature control of concrete that improves the heat dissipation characteristics of the heat pipe by arranging the working fluid in advance along the inner surface of the outer pipe without using a wick. It is to provide a device.

The concrete temperature control apparatus of the present invention is a concrete temperature control apparatus that dissipates heat of hydration generated in the process of constructing a concrete structure to the outside of the concrete structure, and the inside of the concrete structure is in a vacuum state. an external pipe in which a working fluid is sealed, and a reservoir space disposed inside the external pipe and in which the working fluid is stored between an outer peripheral surface of the external pipe and an inner peripheral surface of the external pipe. an inner tube forming a It is characterized in that it is formed along the surface and a wick is not arranged in the storage space.

Further, in the concrete temperature control apparatus of the present invention, the width of the storage space is substantially the same in the direction orthogonal to the extension direction in the arrangement region of the internal pipe.

Further, in the concrete temperature control apparatus of the present invention, a plurality of protrusions are arranged on the outer peripheral surface of the inner pipe on the top surface side, and a heat radiation fin is arranged on the top surface side of the outer pipe. characterized by being

Further, in the concrete temperature control apparatus of the present invention, a part of the internal pipe is led out from the bottom surface of the external pipe, and the internal pipe is welded and fixed to the bottom surface of the external pipe. characterized by

Further, the concrete temperature control apparatus of the present invention further includes a void pipe embedded in the concrete structure and having an open top side, and a liquid stored in the void pipe. The tube is disposed inside the void tube in contact with the liquid, and the bottom surface of the inner tube abuts against the bottom surface of the void tube, so that the bottom surface of the outer tube is in contact with the void tube. It is characterized by being spaced apart from the bottom surface of the tube.

The concrete temperature control apparatus of the present invention comprises an outer pipe, an inner pipe partly arranged inside the outer pipe, and a working fluid sealed in a reservoir space between the outer pipe and the inner pipe. a heat pipe with a In addition, a wick is not arranged in the storage space, and the arrangement area of the working fluid can be easily adjusted according to the arrangement length of the internal pipe. With this structure, the working fluid stored in the storage space is arranged in the central portion in the thickness direction of the concrete structure and its peripheral region, thereby effectively cooling the concrete structure 11 from the inside and The occurrence of cracks in the body 11 is prevented.

Further, in the concrete temperature control apparatus of the present invention, the storage space in which the working fluid is stored is continuously formed along the outer peripheral surface of the inner pipe over the entire circumference, and the radial width of the storage space is , is formed thin and substantially uniformly. With this structure, the working fluid stored in the storage space is easily vaporized by the heat of hydration absorbed from the concrete structure, the heat absorption characteristics are improved, and the concrete structure can be quickly cooled.

Further, the temperature control apparatus for concrete of the present invention has a protrusion on the top surface side of the inner pipe, and has a heat radiation fin on the top surface side of the outer pipe. With this structure, the heat pipe absorbs heat of hydration from the entire circumference, thereby improving the heat absorption characteristics, and the heat dissipation fins improve the heat dissipation characteristics.

Further, in the concrete temperature control apparatus of the present invention, a part of the internal pipe is led out from the bottom surface of the external pipe to the outside, and by adjusting the amount of the lead-out, the storage space in which the working fluid is stored is formed into a concrete structure. It becomes easier to place in the central part of the body and its surrounding areas. This structure makes it easier to dispose the working fluid in the high-temperature region of the concrete structure, thereby improving the heat absorption characteristics of the heat pipe.

Further, the concrete temperature control apparatus of the present invention further includes a void pipe fixed to the concrete structure and a liquid stored in the void pipe. The heat pipe is then placed within the liquid-filled void tube. With this structure, the heat pipe can be recovered from the concrete structure after the concrete has hardened, and the heat pipe can be used repeatedly.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing explaining the temperature control apparatus of the concrete which is one Embodiment of this invention. FIG. 1 is a diagram for explaining a temperature control device for concrete that is an embodiment of the present invention, and is an example of temperature distribution characteristics of a concrete structure disclosed in Concrete Engineering Annual Proceedings (Vol 1.36, No. 1, 2014). indicates FIG. 1 is a diagram for explaining a temperature control device for concrete that is an embodiment of the present invention, and shows an example of the temperature history of a concrete structure disclosed in the Annual Proceedings of Concrete Engineering (Vo 1.36, No. 1, 2014). show. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view illustrating a heat pipe that constitutes a temperature control apparatus for concrete that is an embodiment of the present invention; It is a top view explaining the heat pipe which comprises the temperature control apparatus of the concrete which is one Embodiment of this invention. It is a bottom view explaining the heat pipe which comprises the temperature control apparatus of the concrete which is one Embodiment of this invention. 1 is a cross-sectional view illustrating a heat pipe that constitutes a temperature control apparatus for concrete that is an embodiment of the present invention. FIG. 1 is a cross-sectional view illustrating a heat pipe that constitutes a temperature control apparatus for concrete that is an embodiment of the present invention. FIG. FIG. 10 is a cross-sectional view for explaining a conventional concrete temperature control device.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete temperature control device 10 (hereinafter referred to as "temperature control device 10") according to an embodiment of the present invention will be described in detail below with reference to the drawings. In the following description, in principle, the same reference numerals are used for the same members, and repeated descriptions are omitted. The up-down direction of the paper indicates the height direction of the temperature control device 10 , the left-right direction of the paper indicates the width direction of the temperature control device 10 , and the front-rear direction of the paper indicates the depth direction of the temperature control device 10 .

FIG. 1 is a cross-sectional view illustrating a temperature control device 10 of this embodiment. FIG. 2 is a diagram explaining the temperature distribution characteristics of a concrete structure disclosed in the Proceedings of the Annual Concrete Engineering (Vol. 36, No. 1, 2014). FIG. 3 is a diagram explaining a comparison of temperature histories of concrete structures disclosed in Proceedings of the Annual Concrete Engineering (Vol. 1.36, No. 1, 2014). FIG. 4A is a perspective view illustrating the heat pipe 14 that constitutes the temperature control device 10 of this embodiment. FIG. 4B is a top view illustrating the heat pipe 14 that constitutes the temperature control device 10 of this embodiment. FIG. 4C is a bottom view illustrating the heat pipe 14 that constitutes the temperature control device 10 of this embodiment. FIG. 5A is a cross-sectional view for explaining the heat pipe 14 that constitutes the temperature control device 10 of this embodiment. FIG. 5B is a cross-sectional view for explaining the heat pipe 14 that constitutes the temperature control device 10 of the present embodiment, and shows a cross section of the heat pipe 14 taken along the line AA shown in FIG. 4A.

As shown in FIG. 1, the temperature control device 10 absorbs the heat of hydration H1 generated when the concrete hardens, absorbs the latent heat H2 when the working fluid 24 is vaporized by the heat of hydration H1, and becomes vapor. The latent heat H2 is radiated to the outside of the concrete structure 11 when the steam condenses. The temperature control device 10 prevents cracks from occurring in the concrete structure 11 by suppressing an increase in the internal temperature of the concrete structure 11 during curing.

The temperature control device 10 mainly includes a void pipe 12 arranged inside a concrete structure 11, a liquid 13 stored inside the void pipe 12, and a heat pipe 14 inserted into the void pipe 12. , provided. By arranging the temperature control devices 10 at a plurality of locations at a desired pitch according to the size of the concrete structure 11, the entire concrete structure 11 can be cooled more uniformly. .

The temperature control device 10 is disposed inside a concrete structure 11, such as a bridge leg or a dam frame, which is mainly made of mass concrete during the construction process, especially during curing of poured concrete. The heat pipe 14 absorbs the heat of hydration H1 generated when the concrete hardens, and radiates the latent heat H2 to the outside of the concrete structure 11 . After curing the concrete structure 11 , the heat pipe 14 is basically removed from the concrete structure 11 , so that the heat pipe 14 can be repeatedly used for other concrete structures 11 .

The void pipe 12 is, for example, an iron round pipe, and is fixed to a reinforcing bar or the like while being inserted into the surface 11A of the concrete structure 11 in a substantially vertical direction. The bottom surface 12B of the void tube 12 is closed with an iron plate or the like, so that the liquid 13 can be stored in the void tube 12 . On the other hand, the top surface side of the void tube 12 is opened. After the concrete structure 11 is hardened, the void pipe 12 is buried inside the concrete structure 11 by filling the inside of the void pipe 12 with mortar or the like.

As illustrated, the void pipe 12 is arranged, for example, from the surface 11A to the bottom surface 11B of the concrete structure 11, and the temperature control device 10 absorbs the heat of hydration H1 from the concrete structure 11. Although the details will be described later with reference to FIGS. 2 and 3, the concrete structure 11 has the highest temperature at the center in the thickness direction due to the heat of hydration H1. By disposing from 11A to at least the approximate center of the concrete structure 11, the concrete structure 11 can be effectively cooled.

The liquid 13 is, for example, water, and is injected into the void tube 12 through the opening 12A of the void tube 12 . The liquid 13 receives heat of hydration H1 from the concrete structure 11 via the void pipe 12 and also transfers the heat of hydration H1 to the heat pipe 14 .

The heat pipe 14 is mainly stored in an outer pipe 21, an inner pipe 22 at least partially disposed inside the outer pipe 21, and a reservoir space 23 between the outer pipe 21 and the inner pipe 22. and heat radiation fins 25 formed on the top surface 21A side of the external tube 21 .

The heat pipe 14 is inserted into the void tube 12 filled with the liquid 13 , and absorbs the heat of hydration H<b>1 generated when the concrete hardens from the concrete structure 11 via the liquid 13 . On the other hand, the working fluid 24 absorbs latent heat H2 when it is vaporized by the heat of hydration H1 and becomes steam. After that, the steam flow composed of the steam moves to the top surface 21A side of the external pipe 21, radiates the latent heat H2 to the outside of the concrete structure 11 via the external pipe 21 and the heat radiating fins 25, and heats the steam. condenses and returns to liquid working fluid 24 . In other words, the working fluid 24 repeats the phase change cycle within the outer pipe 21 , thereby cooling the inside of the concrete structure 11 and preventing cracks from occurring in the concrete structure 11 .

Here, the temperature characteristics inside the concrete structure due to the heat of hydration H1 generated when the concrete hardens will be described with reference to FIGS. 2 and 3. FIG. 2 and 3 are not diagrams showing actual measurements of the internal temperature of the concrete structure 11 of the present embodiment when the concrete hardens, but it is presumed that the inside of the concrete structure 11 exhibits similar temperature characteristics. be done.

In FIG. 2, concrete specimens A and B with a length of 1 m, a width of 1 m, and a height of 1.5 m are prepared. The specimen B has a structure in which a heat pipe H is arranged substantially at the center thereof.

As shown in the figure, in specimen A, the internal temperature at measurement point 1 is 74.1°C, and the internal temperature at measurement point 2 is 72.6°C. In other words, in the specimen A, the heat of hydration H1 during hardening of the concrete is not dissipated to the outside through the heat pipe H. The approximately central portion is in the highest temperature state. The solid line, one-dot chain line, two-dot chain line, and dotted line are isothermal lines, and show the situation in which the temperature decreases in that order. declining.

On the other hand, in test sample B, the internal temperature at measurement point 1 is 65.1°C, and the internal temperature at measurement point 2 is 70.2°C. As shown in the figure, the measurement point 1 is approximately the central portion of the specimen B in the vicinity of the heat pipe H, and the heat pipe H radiates the heat of hydration H1 to the outside and cools it. The heat absorption characteristics of the heat pipe H are shown so that a low-temperature region is formed along the extending direction of the heat pipe H (vertical direction on the paper surface). The one-dot chain line, the two-dot chain line, and the dotted line are isothermal lines, and show the situation in which the temperature decreases in that order. Approximately the central portion is in a high temperature state.

As described above, in the concrete structure 11, the heat pipe 14 of the temperature control device 10 is arranged at least up to approximately the center thereof, and the concrete structure 11 can be efficiently cooled by cooling from the area that tends to be in a high temperature state. . By suppressing an increase in the internal temperature of the concrete structure 11 by using the temperature control device 10 after placing the concrete, the occurrence of cracks in the concrete structure 11 is prevented.

In addition, since the measurement point 2 of the specimen B is in a higher temperature state than the measurement point 1, by arranging the heat pipes H at a desired interval with respect to the specimen B, the entire specimen B can be heated. It becomes possible to cool more uniformly.

FIG. 3 is a graph showing the temperature history at the measurement point 2 of the test body A and the test body B, the vertical axis shows the internal temperature of the test body A and the test body B, and the horizontal axis is the number of days elapsed after placing the concrete. indicates Further, the solid line indicates the temperature history of the specimen B with the heat pipe H provided, and the dashed line indicates the temperature history of the specimen A without the heat pipe H provided. The dotted line indicates the outside temperature of the place where the specimen A and the specimen B are placed.

As indicated by the solid line and the one-dot chain line, in the specimens A and B, the internal temperature rises to the maximum in about 1.5 days after placing the concrete, and thereafter the internal temperature gradually decreases. This is because the amount of heat of hydration H1 generated during hardening of the concrete increases after the concrete is placed, but the amount of heat of hydration H1 generated gradually decreases according to the hardening state of the concrete. Although it is also due to the size and shape of the concrete structure 11, the heat quantity of the heat of hydration H1 is as low as, for example, about 55 W, and the maximum internal temperature of the concrete structure 11 is about 80°C. degree.

As shown in FIG. 4A, the heat pipe 14 is configured with, for example, an external tube 21 having a total length of about 6 m as a main housing. The top surface 21A side of the external pipe 21 is closed by the lid portion 31 . Further, as shown in FIG. 4B, on the top surface 21A side of the outer tube 21, for example, eight heat radiation fins 25 are evenly arranged along the outer peripheral surface 21D. On the other hand, as shown in FIGS. 4A and 4C, the inner tube 22 leads out of the outer tube 21 from the bottom surface 21B of the outer tube 21 . The bottom surface 21B side of the outer tube 21 is closed by the lid portion 32 , and the bottom surface 22B side of the internal pipe 22 is closed by the lid portion 34 . Further, the inner tube 22 is welded and fixed to the cover portion 32 of the outer tube 21 in an annular shape, so that the inside of the outer tube 21 is kept in a vacuum state.

With this structure, as shown in FIG. 1, when the heat pipe 14 is arranged inside the void tube 12, the bottom surface 22B of the inner tube 22 abuts against the bottom surface 12B of the void tube 12, thereby The bottom surface 21B of the tube 21 is separated from the bottom surface 12B of the void tube 12 . The heat pipe 14 is arranged in the void tube 12 so that the working fluid 24 covers the substantially central portion of the concrete structure 11, thereby actively cooling the high-temperature region of the concrete structure 11. It becomes possible to As a result, an increase in the internal temperature of the concrete structure 11 is suppressed, and cracks in the concrete structure 11 are prevented.

Furthermore, in the heat pipe 14, the heat radiation area is increased through the heat radiation fins 25, and the heat radiation characteristic of the latent heat H2 is improved. It becomes possible to cool the structure 11 at an early stage.

FIG. 5A is an enlarged sectional view partially enlarging the heat pipe 14 shown in FIG. As illustrated, the external pipe 21 is, for example, a cylindrical iron round pipe, and the bottom surface 21B side of the external pipe 21 is closed with a lid 32 . In addition, as described above, the outer peripheral surface 22C of the inner tube 22 is welded and fixed to the lid portion 32 of the outer tube 21 in an annular shape. With this structure, the inside of the outer pipe 21 is kept in a vacuum state and the working fluid 24 is sealed in the vacuum state. The external pipe 21 is not limited to an iron pipe, and may be made of a material having excellent thermal conductivity, such as a copper pipe, an aluminum pipe, a stainless steel pipe, or the like.

The inner tube 22 is, for example, a cylindrical iron round pipe, and its bottom surface 22B and top surface 22A are closed with lids 33 and 34 . As shown, part of the internal pipe 22 is disposed inside the external pipe 21, and the internal pipe 22 is led out from the bottom surface 21B side of the external pipe 21 to the outside. The inner pipe 22 is not limited to an iron pipe, and may be made of a material having excellent thermal conductivity, such as a copper pipe, an aluminum pipe, a stainless steel pipe, or the like.

Examples of the working fluid 24 include alcohol, ammonia, water, helium, and nitrogen. When the working fluid 24 is liquid at room temperature, at least most of the storage space 23 between the inner peripheral surface 21C of the outer pipe 21 and the outer peripheral surface 22C of the inner pipe 22 is filled with the working fluid 24. The amount to be filled is used. Note that FIG. 5A shows a state in which the working fluid 24 is filled up to the lower surface of the protrusion 41, but the present invention is not limited to this case. For example, the working fluid 24 may be filled up to above the lid portion 33 of the inner tube 22 .

As shown in FIG. 5B, the outer tube 21 is, for example, a cylindrical round pipe with an outer diameter of 45 mm, and the inner tube 22 is, for example, a cylindrical round pipe with an outer diameter of 38 mm. The inner tube 22 is welded and fixed to the outer tube 21 so that the axial center CL1 of the inner tube 22 and the axial center CL2 of the outer tube 21 substantially coincide with each other.

Also, on the top surface 22A side of the internal pipe 22, for example, three protrusions 41 are arranged substantially evenly along the outer peripheral surface 22C. The height of the projecting portion 41 is 1.5 mm in accordance with the width W1 of the storage space 23 . On the other hand, as described above, the bottom surface 22B side of the inner tube 22 is welded and fixed to the lid portion 32 of the outer tube 21 so that the width W1 of the storage space 23 is 1.5 mm over the entire circumference. Note that the width W1 of the storage space 23 may be maintained substantially uniform, and the number and locations of the protrusions 41 may be arbitrarily changed in design.

With this structure, the projections 41 on the top surface 22A side of the internal pipe 22 are in contact with the inner peripheral surface 21C of the external pipe 21, and the width W1 of the storage space 23 is aligned with the outer peripheral surface 22C of the internal pipe 22. It is formed with substantially the same width along. The storage space 23 is continuously formed in an annular shape along the outer peripheral surface 22C of the internal pipe 22, and is formed over the extending direction of the internal pipe 22 (vertical direction on the paper surface).

In this embodiment, a wick having a capillary structure is not provided in the reservoir space 23 , and the reservoir space 23 is formed as a space for storing the working fluid 24 . As the working fluid 24 , an amount sufficient to fill most of the storage space 23 in a liquid state at least at room temperature is sealed inside the outer tube 21 .

With this structure, the heat pipe 14 realizes a structure in which the working fluid 24 is stored inside the outer tube 21 via the storage space 23 without using a wick. As described above, the installation length L1 of the storage space 23 is defined by the length of the internal pipe 22 installed inside the external pipe 21, and can be arbitrarily changed according to the application.

For example, in the structure shown in FIG. 1, the thickness of the concrete structure 11 is about 1400 mm, and the length L1 of the storage space 23 is about 1000 mm. The lead-out length of the inner tube 22 is about 200 mm. The storage space 23 of the heat pipe 14 is arranged in the vertical direction so as to include the substantially central portion of the concrete structure 11 . As a result, the storage space 23 filled with the working fluid 24 of the heat pipe 14 is arranged in the high-temperature region of the central portion of the concrete structure 11 and the peripheral region thereof, so that the concrete structure 11 is heated to the high-temperature region. It is possible to actively cool from

Furthermore, as described above, the top surface 22A of the internal tube 22 is closed by the lid portion 33, so that the liquid working fluid 24 does not accumulate inside the internal tube 22, and the storage space 23 store against Further, the storage space 23 is arranged continuously inside the outer pipe 21 along the inner peripheral surface 21C, and has a narrow width W1 of about 1.5 mm in the radial direction, forming a substantially uniform space. .

With this structure, the working fluid 24 of the heat pipe 14 can absorb the heat of hydration H1 from substantially the entire surface of the outer tube 21 in the circumferential direction through the liquid 13, and is vaporized by the heat of hydration H1. time is shortened. As a result, the speed of the phase change cycle of the working fluid 24 in the outer tube 21 of the heat pipe 14 is increased, the temperature rise inside the concrete structure 11 is prevented, and cracks are prevented from occurring during hardening of the concrete structure 11. prevented.

Here, as described above with reference to FIG. 3, the temperature control device 10 is a device used during curing of the concrete structure 11, and the temperature inside the concrete structure 11 rises to about 80.degree. Therefore, vaporized vapor of the working fluid 24 vigorously rises in the liquid working fluid 24, and the storage space 23 does not become empty. Then, the vapor condenses and liquefies on the upper side of the heat pipe 14, so that the liquid working fluid 24 returns to the storage space 23, and the storage space 23 is substantially filled with the liquid working fluid 24. can be kept filled with

With this structure, the heat pipe 14 can always absorb hydration heat H1 from the concrete structure 11 during curing of the concrete structure 11 . In particular, even at the timing when the internal temperature of the concrete structure 11 rises to the maximum for about 1.5 days after placing the concrete, the heat of hydration H1 can be absorbed from the concrete structure 11 to cool the concrete structure 11. I can.

In the temperature control device 10 of the present embodiment, the void pipe 12 is used, and after the concrete structure 11 is cured, the heat pipe 14 is taken out from the void pipe 12 and the heat pipe 14 is reused. , but not limited to this case. For example, in the temperature control device 10, the heat pipe 14 is embedded in the concrete structure 11 without using the void pipe 12 and the liquid 13, and the heat of hydration H1 is directly transferred from the concrete structure 11 through the heat pipe 14. It is good even if it absorbs heat. In this case, after the concrete structure 11 is hardened, the heat pipe 14 exposed from the surface 11A of the concrete structure 11 is cut, and the other portions are buried inside the concrete structure 11 with mortar or the like.

Also, although the case where the outer pipe 21 of the heat pipe 14 has a substantially circular cross-sectional shape in the lateral direction has been described, the shape is not limited to this case. For example, the cross-sectional shape of the external tube 21 may be a polygonal shape such as a quadrangular shape. As described above, inside the outer tube 21, the storage space 23 having substantially the same width W1 is formed around the inner tube 22. Therefore, the cross-sectional shape of the inner tube 22 in the lateral direction is also the cross-sectional shape of the outer tube 21. The shape is almost similar to the shape. Therefore, like the outer tube 21, the cross-sectional shape of the inner tube 22 may be, for example, a polygonal shape such as a quadrangular shape. With this structure, in the heat pipe 14, the working fluid 24 is arranged in a circular shape along the inner peripheral surface 21C of the outer pipe 21 with a thin width, so that the working fluid 24 is vaporized by the heat of hydration H1. It becomes easier, and an increase in the internal temperature of the concrete structure 11 is prevented. In addition, various modifications are possible without departing from the gist of the present invention.

REFERENCE SIGNS LIST 10 Concrete temperature adjustment device 11 Concrete structure 12 Void pipe 12A Opening 12B Bottom surface 13 Liquid 14 Heat pipe 21 External pipe 21A Top surface 21B Bottom surface 21C Internal peripheral surface 21D External peripheral surface 22 Internal pipe 22A Top surface 22B Bottom surface 22C External peripheral surface 23 Storage space 24 Working fluid 25 Radiation fins 31, 32, 33, 34 Lid 41 Projection

Claims (5)

A concrete temperature control device that dissipates heat of hydration generated in the process of building a concrete structure to the outside of the concrete structure,
an outer tube whose interior is maintained in a vacuum state and in which a working fluid is enclosed;
an internal pipe disposed inside the external pipe and forming a reservoir space in which the working fluid is stored between the outer peripheral surface of the external pipe and the internal peripheral surface of the external pipe;
The internal pipe is arranged from the bottom surface of the external pipe to part of the extension direction of the external pipe, and the storage space is formed along the outer peripheral surface of the internal pipe,
A temperature control apparatus for concrete, wherein a wick is not provided in the storage space. 2. The concrete temperature control apparatus according to claim 1, wherein in the arrangement area of the internal pipe, the width of the storage space is substantially the same in the extending direction and the orthogonal direction. A plurality of protrusions are arranged on the outer peripheral surface of the inner tube on the top surface side,
3. The temperature control apparatus for concrete according to claim 2, wherein heat radiating fins are arranged on the top surface side of the outer pipe. A part of the inner pipe is led out from the bottom surface of the outer pipe, and the inner pipe is welded and fixed to the bottom surface of the outer pipe. 4. The concrete temperature control device according to any one of 3. a void pipe embedded in the concrete structure and having an open top surface;
a liquid stored inside the void tube,
The external pipe is disposed inside the void pipe in contact with the liquid, and the bottom surface of the internal pipe contacts the bottom surface of the void pipe, so that the bottom surface of the external pipe is: 5. The concrete temperature control device according to claim 4, wherein the concrete temperature control device is spaced apart from the bottom surface of the void pipe.

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