JP7349396B2 - concrete cooling structure - Google Patents

Description

This invention relates to a structure for cooling cast concrete by dissipating the hydration heat into the air, and particularly for concrete using a heat conductive member such as a heat pipe that transports heat by utilizing the latent heat of a working fluid. This is related to air cooling technology.

In large concrete structures called mass concrete, heat of hydration tends to accumulate inside the poured concrete while it is curing, resulting in a high temperature at the center of the mass concrete. The temperature near the surface becomes lower, and thermal stress caused by such a temperature difference may cause heat shrinkage cracks or cracks in the mass concrete.

In order to eliminate such inconveniences, the invention described in Patent Document 1 has one end (evaporation part) of the heat transport pipe buried in a concrete structure, and the other end protrudes outside from the concrete structure. By providing a heat radiating plate in the heat radiating part, the heat of hydration of the concrete is released into the atmosphere through the heat transport pipe, and the concrete structure is cooled. The heat transport tube is said to be an application of the heat pipe principle. In other words, a heat pipe is constructed by enclosing a working fluid such as water or fluorocarbon inside a vacuum-deaerated pipe, and providing a porous wick that allows the infiltrated working fluid to flow back to the evaporator under capillary pressure. ing. Therefore, when a temperature difference occurs between one part of the heat pipe and another part, the working fluid evaporates due to external heat input, and the vapor flows towards the other part with lower temperature and pressure. Thereafter, the working fluid radiates heat to the outside and condenses, and the liquefied working fluid permeates the wick and returns to the evaporation area due to capillary pressure (suction pressure) due to the drop in the meniscus in the evaporation area. That is, the working fluid evaporates and condenses and circulates inside the pipe, thereby transporting heat in the form of latent heat of vaporization of the working fluid. Therefore, the heat pipe can transport an amount of heat that is several tens to hundreds of times larger than the amount of heat transported by a metal with high thermal conductivity such as copper.

Patent Document 2 describes a method of cooling poured concrete using this type of heat pipe. In the method described in Patent Document 2, a void formed by a sheath is provided in poured concrete, the lower part of the heat pipe is inserted into the void, and a gap such as water is created between the void and the heat pipe. It is filled with water, and heat is transferred between the two using the pore water. The heat pipe has a structure in which a working fluid is sealed inside a corrugated pipe. Further, the upper end portion of the heat pipe is made to protrude upward from the poured concrete and is exposed to the outside air. It is said that heat dissipation fins may be provided on this part exposed to the outside air. Therefore, the heat of hydration of the poured concrete is radiated to the outside through the heat pipe, which alleviates the temperature deviation within the poured concrete and the associated thermal stress, thereby preventing or suppressing heat shrinkage cracks or cracks. ing.

Special Publication No. 56-2180 Patent No. 6181436

As mentioned above, a heat pipe is a so-called functional component in which a condensable working fluid is sealed inside a high-vacuum pipe, and it is expensive. Once stored, it cannot be reused (reused), such as by burying it after curing. This increases the cost required for curing the concrete, which in turn increases the cost of the concrete structure.

Furthermore, it is preferable that the pipe constituting the heat pipe itself has excellent thermal conductivity, so a thin-walled pipe is used. Therefore, heat pipes do not necessarily have high mechanical strength such as bending strength or compressive strength, and when they are directly embedded in concrete as described in Patent Document 1, the thermal resistance between the concrete and the heat pipe is low. Although it is smaller, there is a possibility that external force will be applied to the heat pipe and it will be damaged, making it impossible to dissipate heat or cool the heat pipe.

On the other hand, as described in Patent Document 2, if a sheath is embedded in a concrete structure to create a void and a heat pipe is inserted into the void, no particular load or external force is applied to the heat pipe. It can protect the heat pipe from damage. Heat transfer between the heat pipe and the void or concrete is performed by pore water, but heat transfer between the pore water and the heat pipe is limited by the surface area of the heat pipe, and the heat transfer between the heat pipe and the heat pipe is If the outer surface area is smaller due to the smaller outer diameter, the amount of heat transferred to the heat pipe, that is, the amount of cooling heat, will be smaller. With a heat pipe made of a corrugated tube as described in Patent Document 2, the surface area (heat transfer area) can be increased due to the wavy outer surface of the heat pipe. Pipes are expensive and increase the cost of curing concrete or the cost of concrete structures.

If a heat pipe consisting of a large diameter pipe is used instead of a corrugated pipe, the external surface area for heat transfer can be increased. However, if the outer diameter of the pipe is large, not only will the wick become larger, but also difficult work will be required to seal the working fluid and seal the pipe (pinch-off), which will increase the cost of the heat pipe. .

Furthermore, in the device described in Patent Document 2, only the pore water is responsible for heat transfer between the concrete and the heat pipe, and the thermal conductivity of the pore water is not necessarily high. There are also restrictions on improving the cooling performance of concrete.

As mentioned above, in the past, even if concrete could be cooled using heat pipes or equivalent heat transport pipes, it has not been possible to reduce costs without reducing cooling efficiency or cooling capacity. In this respect, there was room to develop new technology.

This invention was made against the background of the above-mentioned circumstances, and is a concrete cooling structure that can easily and inexpensively prevent heat shrinkage cracks or cracks caused by heat of hydration in concrete (especially mass concrete). The purpose is to provide the following.

In order to achieve the above object, the invention according to claim 1 provides that a sheath is embedded in poured concrete so as to open to the outer surface of the concrete, and a working fluid sealed inside transports heat as latent heat. A concrete cooling structure in which one end of a heat transfer tube is inserted into the sheath together with a heat transfer liquid, and the other end of the heat transfer tube extends outside of the concrete to serve as a heat radiating part. , a heat transfer exterior body is attached to the heat exchange tube in a state surrounding the heat exchange tube, and the heat transfer exterior body includes a plurality of divided pieces separated from each other in the circumferential direction of the heat exchange tube. Each of the divided pieces includes a holding piece that is brought into close contact with the outer surface of the heat exchanger tube, a bridge portion that extends outward in the radial direction of the heat exchanger tube from the holding piece, and a tip of the bridge portion. a heat exchange plate part that is integrated with the heat exchanger tube and extends in a direction surrounding the outside of the heat exchanger tube; It is characterized in that the body is attached to the heat exchanger tube so as to be integral with the heat exchanger tube.

Further, the invention according to claim 2 is the concrete cooling structure according to claim 1, wherein the divided pieces include a first divided piece and a second divided piece that face each other with the heat transfer tube in between, and A first flange portion extending outward in the radial direction of the heat exchanger tube is provided at an end of the one divided piece facing the second divided piece, and an end of the second divided piece facing the first divided piece A second flange portion facing the first flange portion is provided at the portion, a fastener is provided for fastening the first flange portion and the second flange portion in a direction in which they approach each other, and the first flange portion and the second flange portion are fastened by the fastener, thereby sandwiching the heat exchanger tube between the holding piece portion of the first divided piece and the holding piece portion of the second divided piece. It is characterized in that the divided piece and the second divided piece are attached to the heat exchanger tube.

Furthermore, the invention according to claim 3 is the concrete cooling structure according to claim 2, wherein the first flange portion and the second flange portion have opposing surfaces that face and contact each other, and the opposing surface It is characterized in that each of the two is formed with concave and convex portions that engage with each other.

The invention according to claim 4 is the concrete cooling structure according to claim 2 or 3, wherein the first flange portion is a part of the bridge portion of the first divided piece, and the second flange portion is a part of the bridge portion of the first divided piece. It is characterized in that it is a part of the bridge portion in the second divided piece.

The invention according to claim 5 is the concrete cooling structure according to any one of claims 2 to 4, wherein the fastener is provided to penetrate the first flange part and the second flange part. a bolt, a nut screwed into the bolt, and a screw passing through one of the first flange portion and the second flange portion and screwed into the other. There is.

The invention according to claim 6 is the concrete cooling structure according to any one of claims 1 to 5, in which the heat transfer exterior body is a portion of the heat transfer tube that is inserted into the inside of the sheath. It is characterized by including a heat collecting exterior body attached to the heat exchanger tube, and a heat radiating exterior body attached to the heat radiating portion of the heat exchanger tube extending outward from the sheath.

The invention according to claim 7 is the concrete cooling structure according to claim 6, in which the heat exchange plate portion of the heat radiation exterior body includes a plurality of radiation fins extending outward in the radial direction of the heat transfer tube. It is characterized by being provided with.

The invention according to claim 8 is the concrete cooling structure according to any one of claims 1 to 5, in which the heat transfer exterior body is a first exterior body attached to the heat exchanger tube over its entire length. and a heat dissipation exterior body attached to the outer surface side of a portion of the first exterior body that extends outward from the sheath and corresponds to the heat dissipation part, and the heat dissipation exterior body It consists of a plurality of heat dissipation divided pieces that are separated from each other in the circumferential direction of the exterior body, and each of the heat dissipation division pieces includes a heat dissipation holding piece that is brought into close contact with the outer surface of the first exterior body; a heat dissipation bridge part extending outward in the radial direction of the first exterior body from the heat dissipation holding piece part; and a heat dissipation bridge part that is integrated with the tip of the heat dissipation bridge part and outside the first exterior body. It is characterized by comprising a heat dissipation plate portion extending in a direction surrounding the heat dissipation plate portion.

The invention according to claim 9 is the concrete cooling structure according to claim 8, in which the heat exchange plate portion of the heat radiation exterior body includes a plurality of radiation fins extending outward in the radial direction of the heat transfer tubes. It is characterized by being provided with.

According to the invention according to claim 1, hydration heat generated during curing of poured concrete is not only radiated to the outside air from the outer surface of the concrete, but also has one end inserted into the inside of the sheath. Heat is radiated to the outside air through heat transfer tubes. Therefore, the difference in the amount of heat dissipated between the area near the outer surface of the concrete and the middle or central part becomes smaller, which reduces the temperature difference inside the concrete and the resulting thermal stress, causing heat shrinkage cracks in the concrete. Cracks are effectively prevented. The heat transfer tube is surrounded by a heat transfer sheath, and the heat transfer sheath includes a holding piece that is in close contact with the heat transfer tube, and a bridge that extends outward in the radial direction from the holding piece. , and a heat exchange plate part which is integrated with the holding piece part by its bridge part. Therefore, heat exchange between the heat transfer tube and the heat transfer liquid in the sheath and heat exchange with the outside air in the heat radiation section of the heat transfer tube are performed via the heat exchange plate section, so that the substantial heat of the heat transfer tube is The exchange area is expanded by the heat transfer outer body. Therefore, even if the heat transfer tube itself, such as a heat pipe, has a small outer diameter, it can dissipate a sufficient amount of heat from the concrete into the outside air. In other words, there is no need to particularly increase the size of the heat exchanger tubes that transport heat in the form of latent heat of the working fluid, so costs can be reduced.

If the heat exchanger tube has a small outer diameter, the mechanical strength such as bending strength of the heat exchanger tube itself will be reduced, but the heat exchanger tube is surrounded and reinforced by the holding piece that makes up the heat transfer exterior body. It is in a state of That is, in the invention according to claim 1, the heat transfer exterior body not only promotes heat exchange between the heat transfer tube and the concrete and the outside air, but also has a reinforcing effect on the heat transfer tube, and in this respect, the heat transfer tube is made larger. Alternatively, since it is not necessary to have high strength, it is possible to reduce costs. Note that heat transfer tubes with heat transfer sheaths attached are not directly buried in concrete, but are simply inserted into the sheath, so after the concrete has finished curing, the heat transfer tubes cannot be used for heat transfer purposes. It can be extracted from the sheath together with the exterior body and reused, and therefore the cost required for curing concrete can be reduced.

In addition, the heat transfer sheath can be an extruded shape made of metal such as aluminum (including its alloys), and in that case, the heat transfer sheath with high thermal conductivity is transferred from concrete. It mediates the transfer of heat to the heat tube. Therefore, the thermal resistance between the concrete and the heat transfer tube can be lowered than before, and as a result, the cooling performance of the concrete can be improved.

In the invention according to claim 2, the heat transfer exterior body is attached to the heat transfer tube in a state where the heat transfer tube is tightened by the holding piece portions by fastening the holding pieces at the respective flanges via fasteners. Therefore, the heat exchanger tube is tightly wrapped and held by the holding piece, and the heat exchanger tube is more reliably reinforced.

In the invention according to claim 3, the flange parts fastened together by the fastener are integrated with the uneven parts formed on their opposing surfaces meshing with each other, so that when external force is applied, the holding piece part The strength against misalignment between the heat exchanger tubes is increased, and as a result, external forces are less likely to act on the heat exchanger tubes, and the reinforcing strength of the heat exchanger tubes can be further improved.

In the invention according to claim 4, since the bridge part can function as a flange part for connecting the holding piece parts, the structure of the holding piece parts can be simplified.

In the invention according to claim 5, each divided piece can be fastened and integrated using bolts and nuts, or screws, so that the configuration and assembly of the heat transfer exterior body can be facilitated.

In the invention according to claim 6, the heat transfer exterior body has a different structure for the part where heat is transferred from the concrete and the part where heat is radiated to the outside air, so that the structure suitable for heat exchange is the central part of the concrete or the part that radiates heat to the outside air. Heat dissipation from the center can be optimized.

In the invention according to claim 7, since the heat dissipating exterior body is provided with heat dissipating fins to enlarge the heat dissipating area, it is possible to efficiently dissipate heat and cool the concrete.

In the invention according to claim 8, since the first exterior body surrounds the heat exchanger tube over its entire length, it is possible to eliminate the level difference in the reinforcement strength of the heat exchanger tube and improve the reinforcement performance of the heat exchanger tube.

In the invention according to claim 9, similarly to the invention according to claim 7, the heat radiation exterior body is provided with radiation fins to expand the heat radiation area, so that it is possible to efficiently radiate heat and cool the concrete. .

FIG. 1 is a schematic vertical cross-sectional view for explaining an example of a concrete cooling structure according to the present invention. It is a front view which shows an example of the heat radiating tool which is a heat exchanger tube to which the exterior body for heat transfer was attached. FIG. 2 is a partially omitted vertical cross-sectional view for explaining the structure of a heat pipe. FIG. 3 is a partial perspective view cut along line IV-IV in FIG. 2 and viewed in the direction of the arrow. It is a figure which shows the division piece of the exterior body for heat collection shown in FIG. 4, Comprising: It is a partial perspective view similar to FIG. FIG. 6 is a partial perspective view similar to FIG. 5, showing an example of a divided piece of the heat collecting exterior body provided with an opening such as a slit. FIG. 3 is a partial perspective view cut along line VII-VII in FIG. 2 and viewed in the direction of the arrow. 8 is a diagram showing a divided piece of the heat dissipating exterior body shown in FIG. 7, and is a partial perspective view similar to FIG. 7. FIG. It is a partial sectional view showing an example in which a heat collection exterior body and a heat dissipation exterior body are integrated with a connecting fitting. It is a perspective view showing an example of a stopper. 5 is a diagram for explaining another embodiment of the present invention, and is a partial perspective view similar to FIG. 4. FIG. 12A and 12B are views showing divided pieces of the heat dissipation exterior body shown in FIG. 11, in which (a) is a partial perspective view similar to FIG. 7, and (b) is a view of the cutout portion viewed from the bottom side. It is a figure which shows the example which provided the fan in the front-end|tip part of the exterior body for heat dissipation, Comprising: (a) is a front view, (b) is an end view seen from the edge part side of the exterior body for heat dissipation.

EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated in detail based on an accompanying drawing. In addition, the embodiment described below is only an example of the case where this invention is implemented, and this invention is not limited to the following embodiment.

FIG. 1 is a vertical cross-sectional view schematically showing a state in which concrete 1 is air-cooled according to the present invention. It is. The material may be any suitable cement, such as moderate heat Portland cement or low heat Portland cement. A sheath 2 is embedded in a location such as the center of the concrete 1 where the heat of hydration is difficult to escape to the outside. The sheath 2 is for securing a hole into which a heat dissipation device 3, which will be explained later, is inserted, and is a pipe made of a predetermined rigid metal material such as steel, aluminum, or an alloy thereof, and the concrete 1 is poured into the sheath 2. In some cases, they are simultaneously embedded inside it. In addition, when the sheath 2 is made of aluminum or its alloy, it is preferable that the outer surface of the sheath 2 be subjected to a treatment that does not affect concrete, such as stainless steel coating. The sheath 2 is for discharging heat from the center (or core) of the concrete 1 by inserting a heat dissipating device 3 mainly composed of an extruded shape made of aluminum (including aluminum alloy) into the sheath 2. Therefore, the sheath 2 has a length that reaches the center of the concrete 1 or longer, and one end (bottom) is sealed with tape or an end plate (not shown). The other end is open to the outer surface of the concrete 1.

The inside of the sheath 2 is filled with a heat transfer liquid 4 such as water as a heat transfer inclusion, and in this state, the heat collecting part 5, which is one end of the heat dissipation tool 3, is inserted into and removed from the inside of the sheath 2. There is. That is, the inner surface of the sheath 2 and the heat radiating tool 3 are not in direct contact with each other, but the heat transfer liquid 4 is filled between the two, and the heat transfer liquid 4 causes the sheath 2 or the concrete 1 to be connected to the heat radiating tool 3. (heat collecting section 5). Note that the heat transfer liquid 4 is preferably an inexpensive and easily available fluid such as water, and therefore the sheath 2 is preferably provided so as to face in the vertical direction and open upward. In addition, in order to reduce the amount of the heat transfer liquid 4 mentioned above or to reduce the thermal resistance between the heat transfer liquid 4 and the sheath 2, the outer diameter of the heat collecting part 5 and the inner diameter of the sheath 2 are may be substantially the same, and the two may be brought into contact with each other to allow heat transfer.

An example of the heat radiating tool 3 is shown in FIG. 2. Note that FIG. 2 is a front view of an example of the heat sink 3. As shown in FIG. The heat sink 3 is constructed by attaching an exterior body 7 to a heat transfer tube 6 having excellent heat transport characteristics. An example of the heat transfer tube 6 is a heat pipe, and an example of its structure is schematically shown in FIG. 3. In FIG. 3, reference numeral 8 indicates a sealed pipe (container), and the sealed pipe 8 is a pipe made of metal such as copper, which has high thermal conductivity and does not react with the working fluid to generate gas. A wick 9 is provided on the inner surface of the sealed pipe 8. The wick 9 is for generating capillary pressure by permeation of a liquid-phase working fluid, and may have a fine structure that is excellent in wettability with the working fluid. For example, a thin groove (groove wick) formed on the inner surface of the sealing pipe 8, a mesh material (wire mesh), a porous body (porous sintered metal), or the like is used as the wick 9. An appropriate amount of working fluid 10 is sealed inside the sealed pipe 8 in a state in which non-condensable gas such as air is exhausted (deaerated state). The working fluid 10 is a fluid that transports heat in the form of latent heat by circulating through evaporation and condensation, and condensable fluids such as water, fluorocarbon, and ammonia are used.

The wick 9 is used to circulate the condensed working fluid 10 to the location where evaporation occurs (heat input section), but when the heat transfer tube 6 is used vertically as shown in FIG. In the process, the condensed working fluid 10 flows down by gravity back to the point where evaporation occurs. Therefore, when used in this manner, a heat pipe without a wick can be used. This type of heat pipe is sometimes referred to as a thermosiphon, and the heat exchanger tube in the present invention includes a thermosiphon.

The exterior body 7 attached to the heat exchanger tube 6 so as to surround the heat exchanger tube 6 includes a heat collection exterior body 11 to which heat is transferred from the concrete 1, and a heat radiation exterior body 12 that radiates heat to the outside air. Contains. Both of the heat collecting exterior body 11 and the heat dissipation exterior body 12 are configured to increase the substantial heat transfer area of the heat exchanger tubes 6 and to reinforce the heat exchanger tubes 6.

FIG. 4 is a partial perspective view for explaining the heat collecting exterior body 11, and is a view of the heat exchanger tube 6 cut along the line IV-IV in FIG. 2 and viewed in the direction of the arrow. The heat collecting exterior body 11 has a cylindrical shape as a whole, and its outer diameter is set smaller than the inner diameter of the sheath 2 so that it can be inserted into the sheath 2 described above. In addition, in order to reduce the amount of the heat transfer liquid 4 mentioned above, or to avoid using the heat transfer liquid 4, and to reduce the thermal resistance between the sheath 2 and the sheath 2, the outer diameter of the heat collecting exterior body 11 and the sheath The inner diameters of No. 2 and No. 2 may be substantially the same. The heat collecting exterior body 11 may have a length that covers the entire lower end portion of the heat exchanger tube 6 that is inserted into the sheath 2, but is configured to be shorter than the length of the lower portion of the sheath 2. may have been done. Such a short heat collecting sheath 11 is attached to the heat exchanger tube 6 at a predetermined interval in the axial direction. This is to enable the heat transfer liquid 4 to flow between the inside and outside of each heat collecting exterior body 11 and to improve the efficiency of heat transfer via the heat transfer liquid 4.

Furthermore, the heat collecting exterior body 11 is composed of a plurality of (two in the example shown in FIG. 4) divided pieces 13 so that the heat exchanger tube 6 can be sandwiched and attached to the heat exchanger tube 6. As shown in FIG. 5, these divided pieces 13 have a shape obtained by dividing the heat collecting exterior body 11 in half along its central axis, and each divided piece 13 has the same shape and configuration. . One of these two divided pieces 13 corresponds to the first divided piece in the present invention, and the other corresponds to the second divided piece.

To specifically explain the divided pieces 13 that constitute the heat collecting exterior body 11, each divided piece 13 includes a holding piece part 14 for attaching to the heat exchanger tube 6, and a heat exchange plate part 15 mainly for transmitting heat. and a bridge portion 16 that connects the heat exchange plate portion 15 to the holding piece portion 14. As shown in FIG. 5, the holding piece portion 14 is formed to have the same shape as the outer circumferential surface of the heat transfer tube 6 so that its inner surface is in close contact with the outer circumferential surface of the heat exchanger tube 6, and is configured to have a semicircular cross-sectional shape. . In other words, the holding piece 14 has a shape obtained by vertically dividing a pipe whose inner diameter is equal to the outer diameter of the heat exchanger tube 6 along its central axis. On the other hand, the heat exchange plate part 15 is a long member having a semicircular cross-sectional shape larger than the holding piece part 14 and smaller than the inner diameter of the sheath 2, and is a pipe having a larger diameter than the holding piece part 14. It has a shape in which it is vertically divided along its central axis.

The holding piece portion 14 and the heat exchange plate portion 15, which are arranged concentrically, are connected by a bridge portion 16. This bridge portion 16 is an axially long plate-shaped portion provided in a space between the outer surface of the holding piece portion 14 and the inner surface of the heat exchange plate portion 15 at a constant interval in the circumferential direction. It is. In the example shown in FIGS. 4 and 5, four bridge portions 16 are provided.

Two of the bridge parts 16, 16a, 16a, are an open end (end in the circumferential direction) of the holding piece part 14 which has a semicircular shape and an open end of the heat exchange plate part 15 which has a semicircular shape. (edges in the circumferential direction) are connected to each other. In other words, the space between the outer surface of the holding piece section 14 and the inner surface of the heat exchange plate section 15 is closed in the circumferential direction by these bridge sections 16a, 16a. These two bridge parts 16a, 16a correspond to a first flange part and a second flange part in this invention, and one has a through hole 17 at a predetermined same radius position from the center of the holding piece part 14, and the other has a through hole 17. screw holes 18 are formed respectively.

These through holes 17 and screw holes 18 are for fastening the divided pieces 13 to each other, and the pair of divided pieces 13 are arranged opposite to each other with the heat transfer tube 6 in between so that the center axes of the holding piece portions 14 coincide. When assembled, the bridge portions 16a, 16a of each divided piece 13 will face each other, and the through hole 17 in one of the bridge portions 16a facing each other will be coaxial with the threaded hole 18 in the other bridge portion 16a. Matches on a line. In this state, by inserting the screw 19 as a fastener into the through hole 17 and screwing it into the mating screw hole 18, the bridge portions 16a, 16a facing each other are firmly fastened by the screw 19, and each of the pair The divided pieces 13 are integrated and attached to the heat exchanger tube 6. In that case, in order to ensure the transfer of heat between each divided piece 13 and the heat transfer tube 6, an inclusion with excellent heat transfer properties such as thermal grease (silicon grease) or an appropriate oil compound is applied between the two. It may be placed between. Since these inclusions having excellent heat transfer properties are immersed in the heat transfer liquid 4, it is preferable that the inclusions have characteristics that do not dissolve in the heat transfer liquid 4, such as water-insoluble.

Note that the space defined by each bridge portion 16, 16a between the holding piece portion 14 and the heat exchange plate portion 15 is long and open in the axial direction, but closed in the radial and circumferential directions. There is. Therefore, in order to enable the insertion and tightening of the screws 19 described above, an operating hole 20 is bored in the heat exchange plate portion 15 at a location extending from the central axis of the through hole 17 described above.

In addition, in order to prevent the pair of divided pieces 13 assembled as described above from shifting in the radial direction, the opposing surfaces of each bridge portion 16a, 16a corresponding to the first flange portion and the second flange portion are provided. , concave and convex portions 21 that engage with each other are formed. For example, the uneven portion 21 may be sawtooth-shaped with a small pitch, and is formed by arranging axially long concave portions and convex portions in the radial direction of the divided piece 13 on the opposing surfaces of the respective bridge portions 16a, 16a. It is.

Furthermore, the total circumferential length of the holding piece portions 14 in the divided pieces 13 that are assembled together is set to be the same as or slightly shorter than the outer circumferential length of the heat exchanger tube 6. When each divided piece 13 is assembled so that each holding piece part 14 surrounds heat exchanger tube 6, each holding piece part 14 tightens heat exchanger tube 6 firmly to some extent, and heat collection exterior body 11 is attached to heat exchanger tube. This is to ensure secure attachment to 6. By doing so, the heat exchanger tube 6 is wrapped and held by the holding piece 14 or the heat collecting sheath 11, and the heat exchanger tube 6 is reinforced by the heat collecting sheath 11 or its holding piece 14.

In addition, in the configuration shown in FIGS. 4 and 5, the space surrounded by each bridge part 16, 16a and the heat exchange plate part 15 is closed in the circumferential direction except for the above-mentioned operation hole 20 part. . On the other hand, if the heat transfer liquid 4 is in a turbulent flow or agitated state, the heat transfer coefficient between the sheath 2 and the heat collecting exterior body 11 increases. Therefore, as shown in FIG. 6, it is preferable to form an opening 15a such as a slit along the axial direction in a portion of the heat exchange plate portion 15 between the bridge portions 16, 16a. Since the heat transfer liquid 4 flows due to the temperature difference, it flows inside and outside the heat collecting exterior body 11 via the opening 15a. As a result, the heat transfer coefficient between the sheath 2 or the heat collecting exterior body 11 and the heat transfer liquid 4 improves, and the amount of heat transferred from the concrete 1 to the heat transfer tube 6 increases accordingly. Note that, as long as the opening 15a has a continuous shape in the axial direction, the opening 15a can be formed at the same time when the heat collecting exterior body 11 is manufactured by extrusion molding. Further, the openings 15a are not limited to a continuous shape in the axial direction, but may be bored at predetermined intervals. In that case, an appropriate cutting process is performed after the heat collecting exterior body 11 is extruded. It can be formed by applying.

The heat radiation exterior body 12 is attached to a portion (heat radiation part) 22 of the heat transfer tube 6 that extends from the concrete 1 or the sheath 2, and is basically the same as the heat collection exterior body 11 described above. It is composed of An example is shown in FIGS. 7 and 8. FIG. 7 is a partial perspective view for explaining the heat dissipation exterior body 12, and is a view of the heat exchanger tube 6 cut along the line VII-VII in FIG. 2 and seen in the arrow direction, and FIG. It is a perspective view which shows a part of division piece 23 of the exterior body 12 for heat radiation. The heat dissipation exterior body 12 has a length that covers the entire heat dissipation portion 22 of the heat exchanger tube 6 or a predetermined length portion on the tip side thereof. Further, the heat dissipation exterior body 12 is constituted by a plurality of (two in the example shown in FIG. 7) divided pieces 23 so that the heat exchanger tube 6 can be sandwiched and attached to the heat exchanger tube 6. As shown in FIG. 8, these divided pieces 23 have a shape obtained by dividing the heat dissipating exterior body 12 in half along its central axis, and each divided piece 23 has the same shape and configuration. One of these two divided pieces 23 corresponds to the first divided piece in this invention, and the other corresponds to the second divided piece.

Next, to specifically explain the divided pieces 23 that constitute the heat dissipation exterior body 12, each divided piece 23 includes a holding piece part 24 for attaching to the heat transfer tube 6, and a heat dissipation plate part 25 mainly for heat dissipation. , and a bridge portion 26 connecting the heat dissipation plate portion 25 to the holding piece portion 24. The holding piece part 24 has the same shape and configuration as the holding piece part 14 in the heat collecting exterior body 11 described above, and as shown in FIG. It is formed to have the same shape as the outer peripheral surface, and is configured to have a semicircular cross-sectional shape. In other words, the holding piece portion 24 has a shape obtained by vertically dividing a pipe whose inner diameter is equal to the outer diameter of the heat exchanger tube 6 along its central axis. On the other hand, the heat dissipation plate part 25 is a long member having a semicircular cross-sectional shape with a larger diameter than the holding piece part 24, and a pipe having a larger diameter than the holding piece part 24 is vertically divided along its central axis. It has a shape.

The holding piece portion 24 and the heat radiation plate portion 25, which are arranged concentrically, are connected by a bridge portion 26. This bridge portion 26 is a plate-shaped portion that is long in the axial direction and is provided in the space between the outer surface of the holding piece portion 24 and the inner surface of the heat dissipation plate portion 25 at a constant interval in the circumferential direction. be. In the example shown in FIGS. 7 and 8, five bridge portions 26 are provided.

Two of the bridge parts 26, 26a, 26a, are connected to the open end (circumferential end) of the semicircular holding piece part 24 and the open end (circumferential end) of the semicircular heat dissipation plate part 25. (ends in the circumferential direction) are connected to each other. In other words, the space between the outer surface of the holding piece section 24 and the inner surface of the heat dissipation plate section 25 is closed in the circumferential direction by these bridge sections 26a, 26a. These two bridge parts 26a, 26a correspond to a first flange part and a second flange part in this invention, and one has a through hole 27 at a predetermined same radius position from the center of the holding piece part 24, and the other has a through hole 27. A screw hole 28 is formed in each of the holes.

These through holes 27 and screw holes 28 are for fastening the divided pieces 23 together, and when the pair of divided pieces 23 are assembled facing each other so that the center axes of the holding piece 24 are aligned, each The bridge portions 26a, 26a of the divided piece 23 are opposed to each other, and the through hole 27 in one of the opposing bridge portions 26a is coaxially aligned with the screw hole 28 in the other bridge portion 26a. In this state, by inserting the screw 29 as a fastener into the through hole 27 and screwing it into the mating screw hole 28, the bridge parts 26a, 26a facing each other are firmly fastened by the screw 29, and each of the pair The divided pieces 23 are integrated and attached to the heat exchanger tube 6. In that case, in order to ensure heat transfer between each divided piece 23 and the heat transfer tube 6, an inclusion with excellent heat transfer properties such as thermal grease (silicon grease) or an appropriate oil compound is added between the two. It may be placed in between.

Note that the space defined by the bridge parts 26a, 26a between the holding piece part 24 and the heat dissipation plate part 25 is long and open in the axial direction, but closed in the radial and circumferential directions. . Therefore, in order to enable the work of inserting and tightening the screws 29 described above, an operation hole 30 is bored in the heat dissipation plate portion 25 and the bridge portion 26 at a location where the center axis of the through hole 27 is extended. There is.

In addition, in order to prevent the pair of divided pieces 23 assembled as described above from shifting in the radial direction, the opposing surfaces of each bridge portion 26a, 26a corresponding to the first flange portion and the second flange portion are provided. , concave and convex portions 31 that engage with each other are formed. As an example, the uneven portion 31 may be similar to the uneven portion 21 in the heat collecting exterior body 11 described above, and has a sawtooth shape with a small pitch. This is a portion formed by arranging long concave portions and convex portions in the radial direction of the divided piece 23.

Furthermore, the total circumferential length of the holding piece portions 24 in the respective divided pieces 23 that are assembled together is set to be the same as or slightly shorter than the outer circumferential length of the heat exchanger tube 6. When the divided pieces 23 are assembled together so that each holding piece 24 surrounds the heat exchanger tube 6, each holding piece 24 tightens the heat exchanger tube 6 firmly to some extent, and the heat dissipation exterior body 12 is attached to the heat exchanger tube 6. This is to ensure secure attachment. By doing so, the heat exchanger tube 6 comes to be wrapped and held by the holding piece 24 or the heat dissipating sheath 12, and the heat exchanger tube 6 is reinforced by the heat dissipating sheath 12 or its retaining piece 24.

Further, the heat radiation exterior body 12 includes a large number of heat radiation fins 32 arranged at equal intervals (equal pitch) in the circumferential direction in order to increase the heat radiation area. The heat dissipation fins 32 are thin plate-shaped portions provided radially outward on the outer surface of the heat dissipation plate portion 25, and are formed integrally with the heat dissipation plate portion 25. In addition, when the space|interval (pitch) of the radiation fins 32 is narrow, the operation hole 30 mentioned above may be formed by penetrating a part of the root part.

The divided pieces 13 of the heat collecting exterior body 11 and the divided pieces 23 of the heat dissipation exterior body 12 described above are capable of so-called post-processing such as the aforementioned through holes 17, 27, screw holes 18, 28, and operation holes 20, 30. The cross-sectional shape is the same at all locations in the longitudinal direction (axial direction) except for the locations where: In addition, these divided pieces 13 and 23 are for mediating heat transfer between the heat transfer tube 6 and the concrete 1 or the outside air, and by making them extruded shapes made of aluminum or its alloy, It has excellent thermal conductivity, is easy to manufacture, and has a certain degree of strength.

The holding piece portion 14 of the heat collecting exterior body 11 and the holding piece portion 24 of the heat dissipating exterior body 12 mentioned above are in close contact with the outer circumferential surface of the heat exchanger tube 6 to reinforce the heat exchanger tube 6. The parts 14 and 24, that is, the heat collection exterior body 11 and the heat radiation exterior body 12 are separated from each other. Therefore, in order to transmit the load acting on either the heat collection exterior body 11 or the heat dissipation exterior body 12 to the other, the load applied to the heat transfer tubes 6 is reduced, thereby increasing the strength as a whole. It is preferable to connect the heat collecting exterior body 11 and the heat dissipation exterior body 12 so as to integrate them. The structure for this purpose will be explained with reference to FIG. 9. FIG. 9 is a partial cross-sectional view showing a portion where the heat collection exterior body 11 and the heat radiation exterior body 12 are butted against each other. and the heat dissipating exterior body 12 are attached to the outer periphery of the heat exchanger tube 6, and their end faces in the axial direction are butted against each other. In this state, a pair of bridge portions 16 that are 180 degrees apart in phase (located on the diameter line) in the heat collection exterior body 11 and a pair of bridge portions 16 that are 180 degrees apart in phase (located on the diameter line) in the heat radiation exterior body 12 are The position (that is, the phase) in the circumferential direction is made to match that of the bridge portion 26 . That is, the bridge portions 16 and 26 are like a single plate that is continuous in the axial direction. Connecting fittings 33, 33 are disposed to span these bridge parts 16, 26, and are fixed to each bridge part 16, 26 with fasteners such as screws 33a, adhesive, or the like.

Furthermore, when inserting the lower portion of the heat radiating tool 3 to which the heat collecting exterior body 11 is attached into the sheath 2, it may be necessary to determine the insertion depth. That is, there are cases in which a limited length portion of the lower side is inserted into the sheath 2 without inserting the entire heat collecting exterior body 11, and the remaining portion is left to protrude upward from the sheath 2. . In order to adjust the insertion length in this way, for example, a stopper 34 shown in FIG. 10 may be used.

The stopper 34 shown in FIG. 10 is provided with a flange portion 36 having an outer diameter larger than the inner diameter of the sheath 2 on a boss portion 35 that fits on the outer circumferential side of the heat collecting exterior body 11. It is configured to be fixed to the heat collecting exterior body 11 by inserting a screw 38 into the formed screw hole 37 and abutting its tip against the outer peripheral surface of the heat collecting exterior body 11. The flange portion 36 of this stopper 34 is caught on the upper end of the sheath 2, and the heat collection exterior body 11 is not inserted into the sheath 2 any further, so the attachment position of the stopper 34 to the heat collection exterior body 11 is adjusted as appropriate. Thereby, the insertion length of the heat collecting exterior body 11 into the sheath 2 can be adjusted as appropriate.

The stopper 34 is divided into two semicircular parts, and the heat collecting exterior body 11 is sandwiched between the divided parts, and the divided parts are connected with bolts and nuts, or It is configured to be attached to the heat collecting exterior body 11 by fastening with screws, furthermore, appropriate clamps, etc. Furthermore, it is also possible to have a configuration in which the divided parts are connected with a hinge. With such a configuration, there is no need to feed the stopper 34 from the end side of the heat collecting exterior body 11, so that the stopper 34 can be easily attached to the heat collecting exterior body 11. In addition, if the above-described flange portion 36 is provided, the flange portion 36 closes the upper end opening of the sheath 2, so that foreign substances such as gravel and sand may enter the inside of the sheath 2 while the concrete 1 is curing. This can be prevented or suppressed.

Furthermore, the stopper may be a pipe having a larger outer diameter than the sheath 2, and is fitted into the outer circumferential side of the heat collecting sheath 11 so that its upper end abuts against the lower end of the heat dissipating sheath 12, forming a so-called spacer. It may also be configured to function as a. Furthermore, the stopper only needs to have the function of connecting the heat collecting exterior body 11 to the sheath 2, so in addition to the above-mentioned configuration, for example, the outer peripheral surface of the heat collecting exterior body 11 and the inner peripheral surface of the sheath 2 may be connected to each other. It may also have a wedge structure that is packed between the two. In that case, if the wedge-shaped stopper is provided all around the heat collecting exterior body 11 and the sheath 2, the upper end opening of the sheath 2 can be closed. , entry of foreign matter into the sheath 2 can be prevented or suppressed.

Next, the cooling effect of the concrete 1 according to the present invention will be explained. While the concrete 1 is curing, heat (heat of hydration) is generated due to the hydration reaction, and a part of the heat is transmitted through the concrete 1 and released from the surface thereof to the outside. Further, heat in the center of the concrete 1 is difficult to be released from the surface to the outside, but is transferred to the heat transfer liquid 4 inside the sheath 2 embedded in the concrete 1. Since the lower end portion of the heat transfer tube 6 is inserted into the sheath 2, the heat transferred from the concrete 1 to the heat transfer liquid 4 is further transferred to the heat transfer tube 6.

In that case, the heat collection exterior body 11 described above is attached and integrated with the heat exchanger tube 6, and the heat collection exterior body 11 has a heat exchange plate portion 15 having a large outer diameter. Heat is transferred to the heat transfer tube 6 from the heat transfer liquid 4 through the heat exchange plate section 15 as well as the holding piece section 14 that is in close contact with the outer periphery of the tube. That is, even if the surface area provided for heat transfer is small due to the small outer diameter of the heat pipe constituting the heat transfer tube 6, the substantial heat transfer surface from the heat transfer liquid 4 to the heat transfer tube 6 is maintained. The substantial heat transfer area is far greater than the surface area of the heat exchanger tubes 6 because it includes the entire surface of the piece 14, the entire surface of the heat exchange plate portion 15, and the entire surface of the bridge portion 16 that connects them. It has been expanded. Therefore, a larger amount of heat is transferred from the heat transfer liquid 4 to the heat transfer tubes 6 than when the heat transfer tubes 6 are inserted alone into the heat transfer liquid 4. In addition, since the heat collecting exterior body 11 is made of a metal with high thermal conductivity such as aluminum, it transfers a larger amount of heat to the heat transfer tubes 6 than the heat transfer using only the heat transfer liquid 4, thereby promoting cooling of the concrete 1. can do.

Since the heat transfer tube 6 is constituted by a heat pipe as described above, heat is transferred to the part on the sheath 2 side and is dissipated by the heat dissipation section 22 extending into the outside air, resulting in a temperature difference. Evaporation of the working fluid 10 occurs. The liquid-phase working fluid 10 permeates the wick 9 and contacts the inner surface of the heat transfer tube 6, and is evaporated by the heat transferred from the heat transfer liquid 4. The steam flows toward the heat radiating section 22, where the temperature and pressure are low, and comes into contact with the inner surface of the heat radiating section 22 of the heat transfer tube 6, whereupon heat is taken away and condensation occurs. In other words, since the working fluid 10 transports heat in the form of latent heat by changing from the liquid phase to the gas phase, it has a thermal conductivity that is several tens or hundreds of times higher than that of metals with high thermal conductivity such as copper. show.

The heat carried to the heat radiating part 22 in this way is transmitted to the heat radiating exterior body 12 attached so as to be integrated with the heat radiating part 22, and is radiated into the outside air from the surface thereof. In that case, as schematically shown in FIG. 1, the cooling fan 39 may blow air toward the heat dissipating exterior body 12 to promote heat dissipation from the heat dissipating exterior body 12.

As described above, the heat dissipation exterior body 12 is constructed by connecting the holding piece part 24 that tightly fits and wraps around the heat exchanger tube 6 and the heat dissipation plate part 25 having a larger outer diameter with the bridge part 26. It has an integrated structure, and its surface area, that is, its heat radiation area is much larger than the surface area of the heat exchanger tube 6 (heat radiation part 22). That is, the area for radiating heat from the heat exchanger tubes 6 is expanded by the heat radiating exterior body 12. Therefore, according to the above-mentioned cooling structure according to the present invention, the central part or central part of the concrete 1 can be cooled almost in the same way as the part near the outer surface where heat radiation is likely to occur. Therefore, the temperature difference inside the concrete 1 during curing and the accompanying thermal stress can be reduced, and as a result, heat shrinkage cracks or cracks in the concrete 1 can be effectively prevented or suppressed.

In this way, during curing, natural heat radiation from the surface of the concrete 1 and heat radiation from the center or central part via the heat transfer tubes 6 are performed, and after curing is completed, the heat transfer tubes 6 are pulled out from the sheath 2, and Heat transfer liquid 4 is discharged from sheath 2. Therefore, the heat exchanger tubes 6 are inserted into and removed from the sheath 2, and are left inserted into the sheath 2 while the concrete 1 is curing, but in the process, when external forces such as bending or impact force are applied to the heat exchanger tubes 6. However, since the heat exchanger tube 6 is surrounded and reinforced by the exterior body 7, breakage or breakage will not occur. In other words, handling is facilitated because the handling does not require particularly delicate attention. Moreover, since the heat exchanger tubes 6 can be reused, the cost required for curing the concrete 1 can be reduced, and the cost of mass concrete can be reduced.

Note that the heat transfer liquid 4 may be discharged from the sheath 2 by any conventionally known appropriate method, such as by pumping it out with a pump, or by introducing a substance with a higher specific gravity than the heat transfer liquid 4 into the sheath 2. What is necessary is to push out the hot liquid 4.

In the embodiment described above, the heat collecting exterior body 11 is attached to the lower part of the heat exchanger tube 6, and the heat radiating exterior body 12 is attached to the upper part (heat radiating part 22). A difference in strength occurs between the heat collecting exterior body 11 and the heat dissipation exterior body 12. Therefore, a connecting fitting 33 is provided to integrate the respective holding pieces 14 and 24 in these exterior bodies 11 and 12. In order to eliminate the lack of strength without requiring such a connecting fitting 33, the heat exchanger tube 6 is covered over its entire length with a heat collecting sheath 11, and the heat collecting sheath is removed in the heat radiating section 22. What is necessary is just to attach a heat dissipation exterior body to the outer periphery of 11. An example thereof will be explained with reference to FIGS. 11 and 12.

FIG. 11 is a partial perspective view seen from the cut surface side of the heat dissipating part 22, and FIG. 12(a) illustrates the structure of the divided piece 123 that constitutes the heat dissipating exterior body 122. FIG. 12(b) is a partial perspective view showing a notch formed in a part of the flange. The heat dissipation exterior body 122 in this embodiment, like the heat dissipation exterior body 12 in the above-described embodiment, consists of a pair of divided pieces 123 of the same shape, and each divided piece 123 has a holding piece part 124 and a heat dissipation exterior body 122. It includes a plate portion 125, a bridge portion 126 that connects the holding piece portions 124 and the heat radiation plate portion 125, and further includes a flange portion 127 that connects the pair of divided pieces 123 together.

The holding piece portion 124 is formed in the same shape as the outer circumferential surface of the heat collecting exterior body 11 attached to the heat exchanger tube 6 so as to be in close contact with the outer circumferential surface, and is configured to have a semicircular cross-sectional shape. ing. That is, this holding piece 124 has a semicircular cross-section with a larger radius than the holding piece 14 in the heat dissipation exterior body 12 that is directly attached to the heat transfer tube 6 . Flange portions 127 that extend outward in the radial direction and are continuous in the axial direction are formed at both ends of the holding piece portion 124 in the circumferential direction (the open ends where the pair of holding piece portions 124 face each other). . Therefore, in this embodiment, the heat collecting exterior body 11 corresponds to the first exterior body of the present invention.

One of the flange portions 127a formed at the left and right open ends of the holding piece portion 124 has a narrow flat plate shape extending outward in the radial direction from the open end. Through holes 128 are formed at regular intervals in the flange portion 127a in the longitudinal direction (the axial direction of the holding piece portion 124). This through hole 128 is for inserting a bolt B, which corresponds to a fastener in the present invention. On the other hand, a narrow opening groove 129 is formed in the other flange portion 127b, and is formed in a shape extending outward in the radial direction from the other opening end of the holding piece portion 124. The narrow opening groove 129 is a part for holding the head of the bolt in a non-rotatable manner. Therefore, the width of the narrow opening groove 129 is larger than the width across flats of the head of the bolt B, and the narrow opening grooves 129 are opposed to each other in the diametrical direction. The dimensions are set to be smaller than the corner spacing (width).

The narrow opening groove 129 described above is continuous in the longitudinal direction (the axial direction of the holding piece 124). In such a structure, when holding a plurality of bolts B in the narrow opening groove 129, it is conceivable that the plurality of bolts B must be fed in order from one end of the narrow opening groove 129. Therefore, in order to facilitate the insertion of the bolt B, for example, as shown in FIG. What is necessary is to form a notch 130 having a width that allows the shaft portion of B to be inserted therein.

In addition, when assembling a pair of divided pieces 123, the flat flange part 127a of one divided piece 123 and the flange part 127b of the other divided piece 123 are made to oppose, and these are fastened together with a fastener. A recess of a predetermined shape is formed on the surface of one of these flange portions 127a, 127b facing the other, and a convex portion that fits into the recess is formed on the surface of the other flange portion 127a, 127b facing the recess. It is preferable. According to such a configuration, the mutual positions of the pair of divided pieces 123 can be easily determined, and the external force that shifts each divided piece 123 in the radial direction can be received by the concave portions and convex portions thereof. Therefore, the assembly strength of each divided piece 123 and the strength of the heat dissipating exterior body 122 can be improved.

As shown in FIG. 12(a), the heat dissipation plate part 125, which is connected and integrated with the holding piece part 124 by the bridge part 126, is a circle whose length in the circumferential direction is less than a semicircle. It is arc-shaped. In other words, one end of the heat dissipation plate portion 125 (the end on the flange portion 127b side) is located at a location that intersects with a line extending the flange portion 127b outward in the radial direction. , the other end remains at a position retreated in the circumferential direction (upper side in FIG. 12(a)) from a position where the flat plate-shaped flange part 127a is extended outward in the radial direction. Therefore, the flat flange portion 127a is not covered by the heat dissipation plate portion 125 and is visible from the outside. That is, by receding the end portion of the heat dissipation plate portion 125 in the circumferential direction in this manner, an opening portion 131 is formed that functions similarly to the operation holes 20 and 30 in the embodiment described above. The nut N can be inserted through the opening 131, fitted onto the shaft of the bolt B protruding from the flange 127a, and tightened.

In the examples shown in FIGS. 11 and 12, the heights of the radiation fins 132 are not uniform, and high fins and low fins are arranged alternately in the circumferential direction. This is to promote the flow of air (outside air) between the heat radiation fins 132 and to increase the heat radiation efficiency.

By the way, in the embodiment described above, in order to increase the amount of heat transferred to the heat exchanger tube 6 and to increase the reinforcing strength, the exterior body 7 is connected to the holding pieces 14, 24, 124 and the heat exchange plate. It has a double pipe structure with parts 15, 25, and 125, or a structure similar to this. As a result, the holding piece parts 14, 24, 124 reinforcing the heat exchanger tube 6 are surrounded by the heat exchange plate parts 15, 25, 125 with a space formed on the outer periphery thereof. . In the heat collecting exterior body 11, openings 15a such as the aforementioned slits are formed in the heat exchange plate portion 15, so that the heat transfer liquid 4 actively enters the inside of the heat exchange plate portion 15, and also prevents contact with the outside. It is designed to flow between the two. On the other hand, in the heat dissipation exterior body 12, 122, the heat dissipation plate portions 25, 125 are cylindrical because the heat dissipation fins 32, 132 are provided, and most of the space inside thereof is used for heat dissipation. The exterior bodies 12 and 122 have a closed shape on the outside in the radial direction. The surface of such a radially closed space also comes into contact with the outside air and functions as a heat dissipation surface. However, if left as is, air circulation will not necessarily occur actively, so it is preferable to perform forced ventilation.

FIG. 13 shows an example of this, in which an axial fan 40 is attached via a bracket 41 to the tip (upper end in the installed state) of the heat dissipation exterior body 122. The axial fan 40 is a fan that blows air in the direction of the axis of rotation by rotating blades using a motor, and is preferably a waterproof type fan considering use outdoors. Further, it is preferable that the central axis of rotation and the central axis of the heat dissipating sheath 122 substantially coincide with each other, and that the outer diameter of the rotation circle of the blade is approximately equal to the diameter of the heat dissipating plate portion 125 in the heat dissipating sheath 122. Therefore, when the axial fan 40 is rotated, an air flow is generated in the direction along the central axis of the heat dissipation exterior body 122, and the air flow is transmitted between the holding piece portion 124 and the heat dissipation plate portion 125 in the heat dissipation exterior body 122, and the bridge. The air flows in the axial direction inside the space surrounded by the section 126, thereby ventilating the space. As a result, heat radiation in the space inside the heat radiation plate portion 125 can be promoted, and the cooling efficiency of the concrete 1 can be further improved. Note that even when the heat dissipation exterior body 12 shown in FIGS. 7 and 8 is used, the axial fan 40 can be attached to the distal end thereof in the same manner as shown in FIG. 13 to perform forced ventilation.

Note that the present invention is not limited to the above-described embodiments, and each exterior body is not limited to a so-called two-part structure, but may be divided into a plurality of parts, and each of the divided pieces may be combined. . Moreover, since the holding piece is a part that is attached to the heat exchanger tube (heat pipe) in close contact with the heat exchanger tube, its shape may be one that follows the external shape of the heat exchanger tube. On the other hand, the shape of the heat dissipation plate portion may be an appropriate shape in consideration of heat dissipation efficiency, ease of manufacturing, and ease of handling. Furthermore, as described in the embodiment, each exterior body in the present invention is preferably an extruded shape made of aluminum or an alloy thereof, but the present invention is not limited to this.

1 Concrete 2 Sheath 3 Heat sink 4 Heat transfer liquid 5 Heat collection section 6 Heat transfer tube 7 Heat transfer exterior body 8 Sealed pipe (container)
9 Wick 10 Working fluid 11 Heat collection exterior body 12 Heat dissipation exterior body 13 Divided piece 14 Holding piece part 15 Heat exchange plate part 16 Bridge part 16a Bridge part 17 Through hole 18 Screw hole 19 Screw 22 Heat radiation part 23 Divided piece 24 Holding Piece part 25 Heat dissipation plate part 26 Bridge part 26a Bridge part 27 Through hole 28 Screw hole 29 Screw 32 Heat dissipation fin 33 Connecting fittings 34 Stopper 39 Cooling fan 40 Axial flow fan 122 Heat dissipation exterior body 123 Divided piece 124 Holding piece part 125 Heat dissipation plate Part 126 Bridge part 127 Flange part 127a Flange part 127b Flange part 128 Through hole 129 Narrow opening groove 132 Radiation fin B Bolt N Nut

Claims (9)

A sheath is embedded in the poured concrete so as to open on the outer surface of the concrete, and one end of the heat transfer tube, through which the working fluid sealed inside transports heat as latent heat, is placed inside the sheath with a heat transfer liquid. In a concrete cooling structure, the other end of the heat transfer tube extends outside the concrete and serves as a heat radiating part,
having a heat transfer exterior body attached to the heat transfer tube in a state surrounding the heat transfer tube,
The heat transfer exterior body is composed of a plurality of divided pieces that are separated from each other in the circumferential direction of the heat transfer tube,
Each of the divided pieces includes a holding piece that is brought into close contact with the outer surface of the heat exchanger tube, a bridge portion that extends outward from the holding piece in the radial direction of the heat exchanger tube, and an integral part of the tip of the bridge portion. a heat exchange plate section extending in a direction surrounding the outside of the heat transfer tube; A concrete cooling structure characterized by being integrally attached to a heat transfer tube.
The concrete cooling structure according to claim 1,
The divided pieces include a first divided piece and a second divided piece that face each other with the heat transfer tube in between,
A first flange portion extending outward in the radial direction of the heat transfer tube is provided at an end of the first divided piece facing the second divided piece,
A second flange portion facing the first flange portion is provided at an end portion of the second divided piece facing the first divided piece,
A fastener is provided for fastening the first flange portion and the second flange portion in a direction in which they approach each other,
The first flange portion and the second flange portion are fastened by the fastener, so that the heat exchanger tube is sandwiched between the holding piece portion of the first divided piece and the holding piece portion of the second divided piece. A concrete cooling structure characterized in that the first divided piece and the second divided piece are attached to the heat transfer tube.
The concrete cooling structure according to claim 2,
The first flange portion and the second flange portion have opposing surfaces that face and contact each other,
A concrete cooling structure characterized in that each of the opposing surfaces is formed with concave and convex portions that engage with each other.
The concrete cooling structure according to claim 2 or 3,
The first flange portion is a part of the bridge portion of the first divided piece,
The concrete cooling structure, wherein the second flange portion is a part of the bridge portion of the second divided piece.
The concrete cooling structure according to any one of claims 2 to 4,
The fastener includes a bolt provided through the first flange portion and the second flange portion, a nut screwed into the bolt, and a bolt provided between the first flange portion and the second flange portion. 1. A concrete cooling structure characterized by comprising a screw passing through one of the parts and screwed into the other.
The concrete cooling structure according to any one of claims 1 to 5,
The heat transfer exterior body includes a heat collection exterior body that is attached to a portion of the heat exchange tube that is inserted into the sheath, and a heat dissipation portion that extends from the sheath to the outside of the heat exchange tube. A concrete cooling structure comprising: a heat dissipating exterior body attached to the concrete cooling structure;
The concrete cooling structure according to claim 6,
A concrete cooling structure characterized in that the heat exchange plate portion of the heat dissipation exterior body is provided with a plurality of heat dissipation fins extending outward in the radial direction of the heat transfer tube.
The concrete cooling structure according to any one of claims 1 to 5,
The heat transfer exterior body includes a first exterior body that is attached to the heat exchanger tube over its entire length, and an outer surface of a portion of the first exterior body that corresponds to the heat radiating portion that extends outward from the sheath. It has a heat dissipation exterior body that can be attached to the side,
The heat dissipation exterior body is composed of a plurality of heat dissipation divided pieces that are separated from each other in the circumferential direction of the first exterior body,
Each of the heat dissipation divided pieces includes a heat dissipation holding piece that is brought into close contact with the outer surface of the first exterior body, and a heat dissipation holding piece that extends outward in the radial direction of the first exterior body from the heat dissipation holding piece that is brought into close contact with the outer surface of the first exterior body. a heat dissipation bridge section; and a heat dissipation plate section that is integrated with the tip of the heat dissipation bridge section and extends in a direction surrounding the outside of the first exterior body. concrete cooling structure.
The concrete cooling structure according to claim 8,
A concrete cooling structure characterized in that the heat exchange plate portion of the heat dissipation exterior body is provided with a plurality of heat dissipation fins extending outward in the radial direction of the heat transfer tube.

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