JP6535951B2 - Concrete temperature control device, concrete temperature control method, and construction method of concrete - Google Patents

Description

  The present invention relates to a concrete temperature control device, a concrete temperature control method, and a concrete construction method.

  Since concrete generates a heat of hydration after being placed, cracks (also called temperature cracks) may occur due to temperature stress. As a method for suppressing thermal cracking, "cooling" is performed to remove the heat of hydration. For example, in Patent Document 1, a cement-based material is supplied into the first mold, and the first cooling hole extending in the vertical direction and having an opening at the upper end, and laterally separated from the opening of the first cooling hole A first casting step of constructing a first structure provided with positioning means provided at a position, a first cooling step of supplying a gas into the first cooling hole, and a second mold above the first structure A second frame is provided, a cement-based material is supplied into the second mold, the cement-based material is filled in the first cooling hole, and the second cooling hole is provided extending in the vertical direction and having an opening at the upper end. A concrete construction cooling method is disclosed, comprising a second placement step of constructing the structure and a second cooling step of supplying a gas into the second cooling hole.

  Further, in Patent Document 2, a void is provided to communicate the inside and the outside of the cast concrete so that the outer side is directed upward with respect to the inner side of the cast concrete, and the high temperature portion is formed in the void B. It is disclosed that a heat pipe which conducts heat toward the low temperature part is disposed such that the low temperature part is on the outer side of the cast concrete.

  Further, for example, in Patent Document 3, the temperature rise inside the concrete is suppressed by letting the refrigerant flow through the cooling pipe laid in the concrete, and the cooling pipe, the refrigerant pumping means, the temperature grasping means, the monitoring A pipe cooling system is disclosed which comprises means and adjustment determination means. Patent Documents 4 and 5 disclose other techniques related to pipe cooling.

JP, 2013-159905, A JP, 2015-4186, A JP, 2014-5716, A JP, 2013-147861, A JP 2004-360333 A

  One of the causes of cracking in concrete is cracking due to thermal stress (also referred to as thermal cracking or simply cracking). A cooling method using a heat pipe is known as a technique for suppressing cracking. The conventional cooling method using a heat pipe only suppresses cracking due to the rise of the internal temperature of the concrete due to heat of hydration, in other words, cracking due to internal restraint. On the other hand, thermal cracks also include, for example, cracks due to the temperature difference between the cast and the adjacent existing concrete, in other words, cracks due to external restraint. In order to suppress such cracks due to external restraint, for example, it is known to heat the surface of existing concrete with a heat transfer mat or the like.

  However, with the heat transfer mat or the like, only the surface of the existing concrete can be heated. Therefore, the temperature rise speed of the existing concrete is slow, and it is not efficient because heating required to obtain a sufficient crack suppressing effect requires a large amount of energy. On the other hand, in the cooling method using a conventional heat pipe, the heat of hydration is removed without being used in cooling of the new concrete.

  Therefore, it is conceivable to thermally connect the existing concrete and the new concrete adjacent to the existing concrete with a heat pipe, and transfer the heat of hydration generated after the placement of the new concrete to the existing concrete through the heat pipe. Thereby, the existing concrete can be heated by effectively utilizing the heat of hydration generated after the placement of the new concrete. As a result, not only cracks due to internal restraint, but also cracks of new concrete due to a temperature difference with existing concrete, in other words, cracks due to external restraint can be suppressed. Moreover, in order to fully exhibit the performance of the heat pipe, it is desirable to efficiently transmit the heat of hydration from the new concrete to the heat absorbing portion of the heat pipe. In other words, when the heat of hydration from the new concrete is transferred to the existing concrete through the medium (air, water, etc.) around the heat pipe, for example, the medium around the heat pipe becomes in thermal equilibrium and the heat pipe Performance can not be fully realized.

  An object of the present invention is to provide a technique for effectively utilizing the heat of hydration generated after concrete placement in view of such problems.

  In order to solve the said subject, this invention accommodates a heat pipe in the communicating hole which connects existing concrete and the new construction concrete adjacent to the existing concrete, and thermally connects existing concrete and new construction concrete with a heat pipe. The communication hole is divided into the existing concrete side and the new concrete side around the heat pipe and in the vicinity of the boundary between the existing concrete and the new concrete, thereby suppressing heat transfer in the communication hole.

  Specifically, the temperature control device for concrete according to the present invention is accommodated in a communication hole connecting the existing concrete and the new concrete adjacent to the existing concrete, and thermally connects the existing concrete and the new concrete. A heat pipe is provided around the heat pipe and near the boundary between the existing concrete and the new concrete, the communication hole is divided into the existing concrete side and the new concrete side, and heat transfer in the communication hole is suppressed. And a heat transfer suppression unit.

  According to the temperature control device for concrete according to the present invention, the heat of hydration generated after the placement of the new concrete is effective for heating the existing concrete by thermally connecting the existing concrete and the new concrete with the heat pipe It can be used. Therefore, it is possible to suppress not only cracking due to the rise of internal temperature of concrete due to heat of hydration, in other words, cracking due to internal restraint but also cracking of new concrete due to temperature difference with existing concrete, in other words, cracking due to external restraint. In addition, the heat transfer suppressing portion can suppress the heat transfer in the communication hole. For example, when the heat of hydration from the new concrete is transferred to the existing concrete through the medium (air, water, etc.) of the communication hole, the medium of the communication hole will be in thermal equilibrium and the heat pipe performance will be fully exhibited. I can not do it. According to the temperature control device for concrete according to the present invention, the communication hole is divided into the existing concrete side and the new concrete side by the heat transfer suppressing portion, so the heat of hydration generated after placing the new concrete is efficiently absorbed by the heat pipe It can be done.

Here, the heat pipe is accommodated in the communication hole of the new concrete, and is connected to a heat absorption portion that absorbs heat of hydration generated after the new concrete is cast, and the heat absorption portion, and is accommodated in the communication hole of the existing concrete And a heat radiating portion for radiating heat of hydration absorbed by the heat absorbing portion.

  By absorbing heat at the heat absorption portion, it is possible to suppress the temperature rise after the placement of the new concrete. Further, by radiating heat at the heat radiating portion, the existing concrete can be heated, and the temperature difference between the existing concrete and the new concrete can be reduced. In addition, the heat absorption part and the thermal radiation part should just be thermally connected, and in other words, should just be able to transmit heat. The heat absorbing portion and the heat radiating portion may be directly connected, or an area for transmitting heat, for example, may be interposed therebetween.

  Further, the heat transfer suppressing portion may have a plate portion which divides the communication hole into the existing concrete side and the new concrete side, and a seal portion provided at an edge of the plate portion. As a result, since the air tightness is improved, the heat transfer between the existing concrete side and the new concrete through the medium of the communication hole can be more effectively regulated. As a result, the heat of hydration generated after the placement of the new concrete can be efficiently absorbed by the heat pipe.

  In addition, the heat transfer suppressing unit may further include an adjusting unit that adjusts air tightness by the seal unit. Thereby, for example, air tightness can be ensured even if there is a slight error in the inner diameter of the communication hole. In addition, if the air tightness is too high, there is a concern about the influence (for example, breakage or the like) on the heat pipe due to the increase of the internal pressure of the communication hole on the new concrete side. In the present invention, by adjusting the adjustment portion, it is possible to suppress a sharp rise in the internal pressure and reduce the influence on the heat pipe.

  Further, the heat transfer suppressing portion may have a plate portion which divides the communication hole into the existing concrete side and the new concrete side, and the plate portion may have an adjustment hole for adjusting the heat transfer in the communication hole. By having the adjustment holes, it is possible to suppress the above-mentioned sudden increase in internal pressure and to reduce the influence on the heat pipe.

  Here, the present invention can also be specified as a concrete temperature control method. For example, the present invention is a method of controlling the temperature of concrete, wherein a heat pipe is accommodated in a communication hole connecting the existing concrete and the new concrete adjacent to the existing concrete, and the existing concrete and the new concrete are thermally heated. The heat transfer process for transferring the heat of hydration generated after the placement of the new concrete to the existing concrete by connecting to the second concrete, the communication around the heat pipe and near the boundary between the existing concrete and the new concrete And a heat transfer suppressing step of dividing the hole into the existing concrete side and the new concrete side and suppressing the heat transfer in the communication hole.

  According to the temperature control of concrete according to the present invention, the heat of hydration generated after the placement of the new concrete can be efficiently used for heating the existing concrete. As a result, it is possible to suppress not only the cracking due to the rise in the internal temperature of the concrete due to the heat of hydration, but also the cracking of the new concrete due to the temperature difference with the existing concrete.

Moreover, this invention can also be specified as a construction method of concrete. For example, the present invention relates to a method of constructing concrete, which comprises: placing concrete; and placing the concrete and after placing the concrete, the existing concrete and the new concrete adjacent to the existing concrete. The method further includes the steps of: drilling a communicating hole; and controlling the temperature of the concrete by storing the heat pipe in the communicating hole, and controlling the temperature of the concrete. A heat transfer step of accommodating a pipe, thermally connecting the existing concrete and the new concrete, and transferring the heat of hydration generated after the placement of the new concrete to the existing concrete; and around the heat pipe and The communication hole in the vicinity of the boundary between the existing concrete and the new concrete Separate the a new concrete side existing concrete side, having a suppressing heat transfer suppressing process heat transfer in the communication hole.

  The concrete temperature control step corresponds to the concrete temperature control method described above. According to the method of constructing concrete according to the present invention, it is possible to construct a concrete structure by efficiently utilizing the heat of hydration generated after the placement of new concrete for heating existing concrete. As a result, it is possible to suppress not only the cracking due to the rise in the internal temperature of the concrete due to the heat of hydration, but also the cracking of the new concrete due to the temperature difference with the existing concrete.

  According to the present invention, it is possible to provide a technology for effectively utilizing the heat of hydration generated after concrete placement.

FIG. 1 shows a perspective view of the outline of the temperature control device for concrete according to the first embodiment. FIG. 2A shows a longitudinal sectional view of the outline of the temperature control device for concrete according to the first embodiment. FIG. 2B is an enlarged vertical cross-sectional view of the vicinity of the bubble supplying portion in the concrete temperature control device according to the first embodiment. FIG. 3A shows a longitudinal sectional view of the heat transfer suppressing device according to the first embodiment. FIG. 3B shows a cross-sectional view of the heat transfer suppressing device according to the first embodiment. FIG. 4 shows a construction flow of concrete in the first embodiment. FIG. 5 shows a perspective view of the heat transfer suppressing device according to the second embodiment. FIG. 6 shows an example of a heat pipe.

  Next, an embodiment of the present invention will be described based on the drawings. However, the embodiments described below are exemplifications for carrying out the present invention, and the present invention is not limited to the embodiments described below.

First Embodiment
<Configuration of temperature control device for concrete>
FIG. 1 shows a perspective view of the outline of the temperature control device for concrete according to the first embodiment. FIG. 2A shows a longitudinal sectional view of the outline of the temperature control device for concrete according to the first embodiment. FIG. 2B is an enlarged vertical cross-sectional view of the vicinity of the bubble supplying portion in the concrete temperature control device according to the first embodiment. In FIG. 1 and FIG. 2A, a concrete temperature control device 2 (hereinafter, also simply referred to as the “temperature control device 2”) is accommodated inside the existing concrete 11 and the new concrete 12 which are a part of the structure 1 . More specifically, the new concrete 12 as the second block is placed on the top of the existing concrete 11 as the first block, and the heat that constitutes the temperature control device 2 is placed on the existing concrete 11 and the new concrete 12 Insertion holes 11a and 12a for inserting the pipe 3 are provided. A steel sheath tube 4 is installed in the insertion holes 11 a and 12 a, and the heat pipe 3 is accommodated in the sheath tube 4. Water is filled around the heat pipe 3. Furthermore, in order to suppress the heat transfer between the existing concrete 11 and the new concrete 12 due to the water in the sheath tube 4, the heat transfer is suppressed near the boundary between the existing concrete 11 and the new concrete 12 in the sheath tube 4 The device 5 is installed. In addition, although the bridge pier is illustrated, the structure 1 should just be divided | segmented into several blocks (it is also called a lift), and should be put. The details will be described below.

  The temperature control device 2 is configured to include the heat pipe 3, the heat insulator 6, and the heat transfer suppression device 5. The heat pipe 3 is filled with a working fluid in a vacuum and looped piping. The hydraulic fluid is composed of a mixture of ethanol and water. However, the hydraulic fluid is an example, and may be an alternative fluorocarbon or the like. The heat pipe 3 extends in the vertical direction, and the upflow piping 31 and the downfall piping 32 which are parallel to each other and in which the working fluid flows in different directions, and the upper connection part 33 and the lower connection part 34 which connect the uplift piping 31 and the downfall piping. And a configuration including

  One end (lower end) of the rising pipe 31 is positioned inside the existing concrete 11, and the other end (upper end) is positioned higher than the upper end of the new concrete 12. In other words, the rising pipe 31 is designed to be longer than the height of the new concrete 12. The area | region accommodated in the new construction concrete 12 among the rising piping 31 functions as a heat absorption part which absorbs heat of hydration generated after placement of the new construction concrete 12. The region of the rising pipe 31 above the upper end of the new concrete 12 is covered with the heat insulating material 6 in order to suppress the influence of the external environment (for example, the temperature decrease of the hydraulic fluid due to the heat exchange with air). . Moreover, the area | region accommodated in the existing concrete 11 among the ascending piping 31 functions as a part of thermal radiation part mentioned later.

  Moreover, as shown to FIG. 2B, the bubble supply part 35 is provided in the lower part of the area | region accommodated in the new concrete 12 in the side surface of the raising piping 31. As shown in FIG. The air bubble supply unit 35 has a protrusion 351 that protrudes outward beyond the side surface of the rising pipe 31 and communicates with the inside of the rising pipe 31. Steam is contained in the inside of the projecting portion 351. The steam contained in the inside of the protrusion 351 is heated by the heat of hydration and expanded to be delivered into the rising pipe 31 and rise in the rising pipe 31. In the first embodiment, the diameter of the ascending pipe 31 and the diameter of the descending pipe 32 are designed to be the same. However, for example, the diameter of the rising pipe 31 may be larger than the diameter of the falling pipe 32 so that the surface area of the rising pipe 31 can be increased to absorb more heat of hydration. Further, the rising pipe 31 may be formed smaller than the diameter of the falling pipe 32, for example.

  The descending pipe 32 is designed to have the same length as the ascending pipe 31, one end (upper end) is positioned higher than the upper end of the new concrete 12, and the other end (lower end) is positioned inside the existing concrete 11. As shown to FIG. 2B, in order to suppress the influence of an external environment, the downfall piping 32 has a double pipe | tube structure where between the outer pipe | tube 321 and the inner pipe | tube 322 is vacuum. The influence of the external environment is exemplified by the temperature decrease of the working fluid due to the heat exchange with air in the area above the upper end of the new concrete 12. Moreover, in the area | region accommodated in the new concrete 12, the temperature rise of the hydraulic fluid by absorbing heat of hydration is illustrated by the influence of an external environment. The descending pipe 32 may be covered with the heat insulating material 6.

  The upper connecting portion 33 connects the upper end portion of the ascending pipe 31 and the upper end portion of the descending pipe 32. The upper connecting portion 33 is in communication with the rising pipe 31 and the lowering pipe 32, and the hydraulic fluid supplied from the rising pipe 31 flows therein. In addition, a storage space 331 of the vapor in which the vapor supplied from the rising pipe 31 is accumulated is formed in the upper part of the upper connection portion 33. The upper connection portion 33 functions as an intermediate heat dissipation portion that condenses the steam and dissipates heat to the outside.

  The lower connecting portion 34 connects the lower end portion of the ascending pipe 31 and the lower end portion of the descending pipe 32. The upper connection portion 33 is in communication with the rising pipe 31 and the lowering pipe 32, and the hydraulic fluid supplied from the lowering pipe 32 flows therein. Moreover, the storage space (not shown) of the vapor | steam which the vapor | steam supplied from the raising piping 31 accumulates in the upper part of the lower connection part 34 is formed.

FIG. 3A shows a longitudinal sectional view of the heat transfer suppressing device according to the first embodiment. FIG. 3B shows a cross-sectional view of the heat transfer suppressing device according to the first embodiment. The heat transfer suppressing device 5 is provided around the heat pipe 3 and in the vicinity of the boundary between the existing concrete 11 and the new concrete 12 and divides the inside of the sheath pipe 4 into the existing concrete 11 side and the new concrete 12 side. Suppress heat transfer inside. The heat transfer suppression device 5 includes a partition plate 51, a support member 52, a seal member 53, and an adjustment device 54. The partition plate 51 is an example of the plate portion of the present invention, has a circular shape slightly smaller than the inner diameter of the sheath tube 4, and is formed with a through hole 511 through which the ascending pipe 31 and the descending pipe 32 penetrate. The support member 52, together with the partition plate 51, constitutes an example of the plate portion of the present invention, is circular with substantially the same diameter as the partition plate 51, and is formed with a through hole 521 through which the ascending pipe 31 and the descending pipe 32 penetrate. There is. Further, the supporting member 52 is provided with a standing portion 522 which rises along the peripheral edge. The seal member 53 is configured to include a circular tube 531 and a U-shaped connecting portion 532 connected to the circular tube 531. By accommodating the standing portion 522 in the opening portion of the connection portion 532, the seal member 53 can be supported by the support member. For the seal member 53, for example, a trim seal can be used.

  The adjusting device 54 adjusts the airtightness of the seal member 53. The adjusting device 54 includes a through hole 512 of a partition plate formed in the partition plate 51, a through hole 522 of a support member formed in the support member 52, a bolt 55, and a nut 56. The through holes 511 of the partition plate and the through holes 511 of the support member are designed to be slightly smaller than the outer diameter of the shaft portion of the bolt 55. The distance between the partition plate 51 and the support member 52 can be adjusted by passing the shaft portion of the bolt 55 through the through hole 512 of the partition plate and the through hole 522 of the support member and tightening the nut 56. The seal member 53 is sandwiched between the partition plate 51 and the support member 52. When the nut 56 is tightened tightly, the tube 531 of the seal member 53 is crushed, the contact area with the inner surface of the sheath tube 4 is increased, and the air tightness is improved. Further, the heat transfer suppressing device 5 is fixed in the sheath tube 4 by utilizing the contact between the tube 531 and the sheath tube 4 when the tube 531 of the sealing member 53 is crushed.

  The heat transfer suppressing device 5 may have a simpler configuration by omitting the adjusting device 54. In this case, the diameter of the tube 531 is preferably larger than that of the tube 531 of the first embodiment so that the tube 531 and the sheath tube 4 can be in contact with each other without crushing the tube 531. Accordingly, the heat transfer suppressing device 5 can be fixed in the sheath tube 4 while securing the airtightness. Further, for example, the heat transfer suppressing device 5 may have a simpler configuration in which only the seal member is provided on the peripheral edge of the partition plate 51.

<How to build concrete>
Next, a method of constructing concrete will be described including a temperature control method. FIG. 4 shows a construction flow of concrete in the first embodiment. In the concrete placing process, after placing the existing concrete 11, a new concrete 12 is placed.

  The drilling process is performed along with the concrete placing process. In the drilling process, a sheath pipe 4 having a length reaching up to the new concrete 12 is installed in the formwork of the existing concrete 11. When the existing concrete 11 is cast with the sheath pipe 4 installed, a communication hole communicating with the new concrete 12 is formed in the existing concrete 11. The communication holes may be formed after the placement of concrete.

  In the temperature control step, water and the temperature control device 2 including the heat pipe 3 are accommodated in the sheath pipe 4 to control the temperature of the concrete. The temperature control step includes a heat transfer step and a heat transfer suppression step.

In the heat transfer process, the temperature control device 2 is accommodated in the sheath pipe 4 before the heat of hydration of the new concrete 12 is generated, and the heat of hydration of the new concrete 12 is transferred to the existing concrete 11 through the heat pipe 3 Be relocated. More specifically, when the heat of hydration is generated after the placement of the new concrete 12, the area of the rising pipe 31 contained in the new concrete 12 functions as a heat absorbing portion. Then, the generated heat of hydration passes through the sheath tube 4 and the water in the sheath tube 4 and is absorbed by the heat absorbing portion of the heat pipe 3. That is, the temperature of the new concrete 12 falls by heat exchange between the heat pipe 3 and the new concrete 12 around the heat absorbing portion. On the other hand, when the heat of hydration is generated, the steam contained in the inside of the projecting portion 351 of the bubble supply unit 35 is heated by the heat of hydration and expanded. As a result, the expanded steam is sent out into the rising pipe 31 and rises in the rising pipe 31. As a result, in the rising pipe 31, the working fluid whose temperature has risen flows upward. The upper connection portion 33 functions as an intermediate heat radiation portion, and the heat is dissipated to condense the vapor, and the condensed vapor is accumulated in the storage space 331. In the upper connection portion 33, the working fluid whose temperature has risen flows from the rising pipe 31 and is sent out to the falling pipe 32. In the descending pipe 32, the hydraulic fluid whose temperature has risen descends. The descending pipe 32 has a double pipe structure. Therefore, the hydraulic fluid flowing through the down piping 32 flows in a state where the temperature is maintained. In the lower connection portion 34, the hydraulic fluid flowing from the down piping 32 is delivered to the up piping 31. The region of the lower connecting portion 34 and the rising pipe 31 which is accommodated in the existing concrete 11 functions as a part of the heat radiating portion, and the heat is exchanged between the working fluid and the existing concrete 11. As a result, the temperature of the existing concrete 11 rises.

  Here, in the temperature control device 2, a heat transfer suppressing device 5 is connected in the vicinity of the boundary between the existing concrete 11 and the new concrete 12 and around the heat pipe 3. Therefore, in the heat transfer suppressing step, the temperature control device 2 divides the inside of the sheath tube 4 into the existing concrete 11 side and the new concrete 12 side, and the heat transfer in the sheath tube 4 is suppressed. That is, as described above, the heat of hydration of the new concrete 12 is efficiently transferred to the existing concrete 11 through the heat pipe 3.

  When the temperature control process is completed, the temperature control device 2 is removed, and the sheath tube 4 is backfilled with a filler such as concrete or mortar. The temperature control device 2 may be buried without removing it. In addition, when the structure 1 is comprised by three or more blocks (3 lifts or more), the process mentioned above is repeatedly performed by setting the new concrete 12 as the existing concrete 11, and the structure 1 is built.

<Function effect>
According to the concrete temperature control device 2 or the concrete construction method according to the first embodiment, the existing concrete 11 and the new concrete 12 are thermally connected by the heat pipe 3 to drive the new concrete 12 The heat of hydration generated later can be effectively used to heat the existing concrete 11. Therefore, not only cracks caused by the rise of internal temperature of the new concrete 12 due to heat of hydration, in other words, cracks due to internal restraint, but also cracks of the new concrete 12 due to temperature difference with the existing concrete 11, in other words, cracks due to external restraint be able to. Further, the heat transfer suppressing device 5 can suppress the heat transfer in the sheath tube 4. If the heat of hydration from the new concrete 12 is transferred to the existing concrete 11 through the water in the sheath tube 4, the water in the sheath tube 4 will be in thermal equilibrium and the performance of the heat pipe 3 will be sufficient. It can not be demonstrated. According to the temperature control device 2 for concrete or the method for constructing concrete according to the first embodiment, the inside of the sheath pipe 4 is divided into the existing concrete 11 side and the new concrete 12 side by the heat transfer suppressing device 5, for example, The heat of hydration generated after the placement of the new concrete 12 can efficiently absorb heat to the heat pipe 3.

In addition, the heat transfer suppressing device 5 is provided with the adjusting device 54, whereby airtightness can be ensured even if the inner diameter of the sheath tube 4 has some errors. In addition, if the air tightness is too high, there is a concern that the heat pipe 3 may be damaged due to the increase of the internal pressure in the sheath pipe 4 on the new concrete 12 side.
However, according to the temperature control device 2 according to the first embodiment, since the rapid increase of the internal pressure can be suppressed by adjusting the adjustment device 54, breakage of the heat pipe 3 can be reduced.

Second Embodiment
FIG. 5 shows a perspective view of the heat transfer suppressing device according to the second embodiment. In the temperature control device 2 according to the second embodiment, the heat transfer suppressing device 5 is constituted by a partition plate 51 made of water-expandable rubber (also referred to as a water-expandable water blocking agent and water-expandable rubber). Further, in the partition plate 51, in addition to the through holes 511 through which the ascending pipe 31 and the descending pipe 32 penetrate, two adjustment holes 57 for adjusting the heat transfer in the sheath pipe 4 are formed. In the present embodiment, the diameter of the adjustment hole 57 is about 2 mm, but is not limited to this. The diameter and the number of the adjusting holes 57 can be appropriately designed in accordance with the casting conditions of the concrete (casting time, type of concrete, volume of concrete, etc.), the type and material of the heat pipe 3 and the like. The heat transfer suppressing device 5 may have a simpler configuration without the adjustment hole 57.

  According to the temperature control device 2 according to the second embodiment, the heat transfer suppressing device 5 is constituted by the partition plate 51 made of water expansible rubber, so that the airtightness is achieved even if there is a slight error in the inner diameter of the sheath tube 4 Can be secured. Further, as described above, if the air tightness is too high, there is a concern that the heat pipe 3 may be damaged due to the increase of the internal pressure in the sheath pipe 4 on the new concrete 12 side. However, according to the temperature control device 2 according to the second embodiment, by providing the adjustment holes 57, it is possible to suppress a sharp rise in the internal pressure, and thus it is possible to reduce the breakage of the heat pipe 3. Further, the temperature control device 2 according to the second embodiment is configured by only the heat transfer suppressing device 5 with the partition plate 51 made of water-expansible rubber, and the parts smaller than the temperature control device 2 according to the second embodiment. It can be a score.

<Modification>
Although the preferred embodiments of the present invention have been described above, the present invention can be implemented by combining the embodiments as much as possible.

  For example, the heat transfer suppressing device 5 may be further installed near the upper end of the new concrete 12. Thereby, the heat exchange between the water in the sheath pipe 4 and the air in the vicinity of the upper end of the new concrete 12 can be restricted. As a result, the heat of hydration generated after the placement of the new concrete 12 can be efficiently absorbed by the heat pipe 3.

  In addition, the sheath pipe 4 may be cut in the vicinity of the boundary between the existing concrete 11 and the new concrete 12, and a material having low thermal conductivity such as rubber may be interposed therebetween. Thereby, the heat transfer between the existing concrete 11 side and the new concrete 12 side, which uses the sheath pipe 4 itself as a transmission medium, can be suppressed. As a result, the heat of hydration generated after the placement of the new concrete 12 can be efficiently absorbed by the heat pipe 3.

  The heat pipe is not limited to that of the first embodiment, and may be, for example, as shown in FIG. The heat pipe 7 shown in FIG. 6 includes a heat radiating portion (condenser) 71, a heat insulating portion 72 and a heat input portion (evaporator) 73. The heat pipe 7 is a hollow metal pipe. In addition, a capillary structure ("wick") 74 is formed of metal mesh or the like on the inner wall (outside the inner side of the cross section) of the metal tube, and the central portion 75 of the metal tube is hollow (container). Inside the heat pipe 7, a working fluid (also referred to as a "heat medium") such as water or chlorofluorocarbon which is vaporized or liquefied at a predetermined temperature is enclosed.

DESCRIPTION OF SYMBOLS 1 ... Structure 11a, 12a ... Insertion hole 2 ... Temperature control apparatus 3, 7 ... Heat pipe 31 ... Rising piping 32 ... Descending piping 33 ... Upper connection part 34 · · · lower connection portion 35 · · · bubble supply portion 4 · · · sheath tube 5 · · · heat transfer suppression device 51 · · · · · · · · · · · · · · · · partition plate 52 Adjustment device 57 ··· Adjustment hole 6 · · · Insulation material

Claims (7)

A heat pipe which is accommodated in a communication hole communicating the existing concrete and the new concrete adjacent to the existing concrete, and thermally connects the existing concrete and the new concrete;
A heat transfer suppressing portion provided around the heat pipe and near the boundary between the existing concrete and the new concrete, dividing the communication hole into the existing concrete side and the new concrete side to suppress heat transfer in the communication hole When,
Concrete temperature control device.   The heat pipe is accommodated in the communication hole of the new concrete, and is connected to a heat absorbing portion which absorbs heat of hydration generated after the new concrete is cast, and the heat absorbing portion, and is accommodated in the communication hole of the existing concrete. The temperature control device for concrete according to claim 1, further comprising: a heat radiating portion that radiates the heat of hydration absorbed by the heat absorbing portion.   The temperature of concrete according to claim 1 or 2, wherein the heat transfer suppressing portion has a plate portion that divides the communication hole into the existing concrete side and the new concrete side, and a seal portion provided at an edge of the plate portion. Control device.   The temperature control device for concrete according to claim 3, wherein the heat transfer suppressing unit further includes an adjusting unit configured to adjust air tightness by the seal unit.   The heat transfer suppressing portion has a plate portion dividing the communication hole into the existing concrete side and the new concrete side, and the plate portion has an adjustment hole for adjusting the heat transfer in the communication hole. Concrete temperature control device as described in. It is a temperature control method of concrete, and
A heat pipe is accommodated in a communication hole communicating the existing concrete and the new concrete adjacent to the existing concrete, the existing concrete and the new concrete are thermally connected, and the heat of hydration generated after the placement of the new concrete Heat transfer process to transfer the above to the existing concrete,
A heat transfer suppressing step of dividing the communication hole into the existing concrete side and the new concrete side around the heat pipe and in the vicinity of the boundary between the existing concrete and the new concrete, and suppressing heat transfer in the communication hole; How to control the temperature of concrete, including: How to build concrete,
The process of placing concrete,
A drilling step of drilling a communication hole communicating the existing concrete and the new concrete adjacent to the existing concrete at the time of placing the concrete or after placing the concrete;
And a temperature control step of concrete for containing a heat pipe in the communication hole and controlling the temperature of concrete.
The temperature control process of the concrete is
A heat transfer step of accommodating a heat pipe in the communication hole, thermally connecting the existing concrete and the new concrete, and transferring the heat of hydration generated after the placement of the new concrete to the existing concrete;
A heat transfer suppressing step of dividing the communication hole into the existing concrete side and the new concrete side around the heat pipe and in the vicinity of the boundary between the existing concrete and the new concrete, and suppressing heat transfer in the communication hole; How to build concrete with.

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