JP7475263B2 - Method of constructing concrete embankment - Google Patents

Description

The present invention relates to a method for constructing a concrete embankment.

Inside the dam body, passages such as a discharge pipe and an inspection gallery are provided. Patent Document 1 discloses a method for constructing a concrete dam body with a discharge pipe inside. In the method disclosed in Patent Document 1, first, a platform is constructed and the discharge pipe is installed in a predetermined position. Next, concrete is poured to cover the discharge pipe.

Japanese Patent Application Laid-Open No. 63-261008

The temperature of poured concrete rises due to the heat of hydration. Meanwhile, the heat of the concrete is released from inside passages such as discharge pipes and inspection galleries, and from the sides of the concrete embankment to the outside, so the temperature gradient of the concrete becomes large around the passages and near the sides. If the temperature gradient is large, excessive tensile stress will be generated in the concrete, which may cause cracks. For these reasons, there is a demand to reduce the temperature gradient of concrete.

The purpose of the present invention is to reduce the temperature gradient in concrete.

The present invention is a method for constructing a concrete embankment, which comprises arranging a first heat transfer medium flow pipe along a frame body that defines a concrete pouring area, pouring concrete in the concrete pouring area so as to cover the periphery of the first heat transfer medium flow pipe, and circulating a heating medium through the first heat transfer medium flow pipe after the concrete has been poured.The frame body is a passage portion that forms a passage inside the concrete embankment, and the first heat transfer medium flow pipe is arranged around the passage portion .
The present invention also relates to a method for constructing a concrete embankment, comprising arranging a first heat transfer medium flow pipe along a frame body defining a concrete pouring area, pouring concrete in the concrete pouring area so as to cover the periphery of the first heat transfer medium flow pipe, and circulating a heating medium through the first heat transfer medium flow pipe after the concrete has been poured, the frame body being a side forming formwork that forms the side of a part of the concrete embankment, the first heat transfer medium flow pipe being arranged along the side forming formwork, the side forming formwork being removed after the concrete has been poured to expose the side, a heating medium being flowed through the first heat transfer medium flow pipe, and new concrete being poured in the area facing the side while the side is heated.

According to the present invention, the temperature gradient in concrete can be reduced.

1 is a cross-sectional view of a concrete embankment constructed by a construction method according to a first embodiment of the present invention. 2A and 2B are diagrams for explaining a method of constructing a concrete embankment according to the first embodiment of the present invention, in which (a) is a diagram showing the state in which a discharge pipe is installed above poured concrete, corresponding to a cross section taken along line IIA-IIA shown in FIG. 1, (b) is a cross-sectional view taken along line IIB-IIB shown in FIG. 2A, and (c) is a cross-sectional view taken along line IIC-IIC shown in FIG. 2A. 3A and 3B are diagrams for explaining a method of constructing a concrete embankment according to the first embodiment of the present invention, in which (a) corresponds to FIG. 2A and shows the state in which concrete has been poured to cover the discharge pipe, (b) is a cross-sectional view taken along line IIIB-IIIB shown in FIG. 3A, and (c) is a cross-sectional view taken along line IIIC-IIIC shown in FIG. 3A. 13 is a graph showing an example of a set temperature. 5A is a plan view of a concrete embankment constructed by a construction method according to a second embodiment of the present invention, and FIG. 5B is a cross-sectional view taken along line VB-VB shown in FIG. 5A. FIG. FIG. 11 is a diagram for explaining a method for constructing a concrete embankment according to a second embodiment of the present invention.

The method for constructing a concrete embankment according to an embodiment of the present invention will be described below with reference to the drawings.

First Embodiment
First, a method for constructing a concrete embankment 100 according to a first embodiment of the present invention will be described with reference to Fig. 1 to Fig. 4. Fig. 1 is a cross-sectional view of a concrete embankment 100.

As shown in FIG. 1, inside the concrete embankment 100, passages such as a discharge channel 2 and an inspection gallery 3 are provided. Opening and closing doors 4 are provided near the upstream and downstream openings of the discharge channel 2.

In the following, we will explain the case where the passage is a discharge channel 2, but the passage may also be an inspection gallery 3.

In the method of constructing the concrete embankment 100, first, concrete is poured to a predetermined height. Next, with the pouring of concrete temporarily stopped, the discharge pipe (passage section) 2a forming the discharge channel 2 is installed via a stand (not shown). Next, a frame (not shown) is installed at the boundary of the area to be partitioned as the discharge pipe 2a, and concrete is poured in the area outside the frame. After the concrete hardens, the frame is removed to construct the section of the discharge pipe 2a, and the inside is secured as the discharge channel 2. Note that the frame may be left in place to function as a part of the discharge pipe 2a that defines the concrete pouring area of the discharge pipe 2a. After that, opening and closing doors 4 are provided near the upstream and downstream openings of the discharge pipe 2a, and the concrete embankment 100 is completed.

The temperature of the poured concrete rises due to the heat of hydration. Meanwhile, the heat of the concrete is released into the discharge path 2. This causes a large temperature gradient in the concrete around the discharge pipe 2a. If the temperature gradient is large, excessive tensile stress will be generated in the concrete, which may cause cracks.

In this embodiment, the concrete around the discharge pipe 2a is heated using the configuration described below. This reduces the temperature gradient of the concrete around the discharge pipe 2a. This makes it possible to prevent cracks.

The method for constructing the concrete embankment 100 will be described in detail with reference to Figures 2 to 4. Here, we will explain the process after installing the discharge pipe 2a above the poured concrete via a stand (not shown).

Figures 2 and 3 are diagrams for explaining the method of constructing the concrete embankment 100. Figure 2(a) is a diagram showing the state in which the discharge pipe 2a is installed above the poured concrete, corresponding to a cross section along the line IIA-IIA shown in Figure 1. Figure 2(b) is a cross section along the line IIB-IIB shown in Figure 2(a), and Figure 2(c) is a cross section along the line IIC-IIC shown in Figure 2(a). Figure 3(a) is a diagram showing the state in which concrete has been poured to cover the discharge pipe 2a, corresponding to Figure 2(a). Figure 3(b) is a cross section along the line IIIB-IIIB shown in Figure 3(a), and Figure 3(c) is a cross section along the line IIIC-IIIC shown in Figure 3(a).

In the method of constructing the concrete embankment 100, first, as shown in FIG. 2, the first heat transfer medium flow pipe 10, the second heat transfer medium flow pipe 20, and the optical fiber cable (thermometer) 30 for measuring temperature are arranged around the discharge pipe 2a. The first heat transfer medium flow pipe 10 and the second heat transfer medium flow pipe 20 are, for example, electric resistance welded steel pipes. The second heat transfer medium flow pipe 20 is arranged farther away from the discharge pipe 2a than the first heat transfer medium flow pipe 10. The optical fiber cable 30 is arranged farther away from the discharge pipe 2a (the aforementioned frame body) than the first heat transfer medium flow pipe 10.

In FIG. 2(b), the second heat transfer medium flow pipe 20 is omitted, and in FIG. 2(c), the first heat transfer medium flow pipe 10 and the optical fiber cable 30 are omitted.

As shown in Figures 2(a) and (b), the first heat transfer medium flow pipe 10 is supported and installed on a stand or steel material (not shown) in a state where it is alternately folded back on the upstream side and downstream side to form a continuous pipe. As shown in Figures 2(a) and (c), the second heat transfer medium flow pipe 20 is supported and installed on a stand or steel material (not shown) in a state where it is alternately folded back on the upstream side and downstream side to form a continuous pipe.

The first heat transfer medium flow pipes 10 may be arranged at intervals in the circumferential direction of the discharge pipe 2a so as to extend along the axial direction of the discharge pipe 2a, or may be arranged spirally or circumferentially around the discharge pipe 2a. The same applies to the second heat transfer medium flow pipe 20.

2(a) and (b), the optical fiber cable 30 is arranged above and below the discharge pipe 2a, and to the left and right of the discharge pipe 2a when viewed from the upstream side, along the axial direction of the discharge pipe 2a. The optical fiber cable 30 may be arranged in a spiral or circular shape around the discharge pipe 2a.

Next, as shown in FIG. 3, new concrete is poured in the area outside the discharge pipe 2a from the bottom up, covering the discharge pipe 2a, the first heat transfer medium flow pipe 10, the second heat transfer medium flow pipe 20, and the optical fiber cable 30 with concrete.

Next, the first heat transfer medium flow pipe 10 is connected to the heating medium tank 11, and the second heat transfer medium flow pipe 20 is connected to the cooling medium tank 21. The heating medium and the cooling medium are, for example, water. In addition, the optical fiber cable 30 is connected to the temperature measuring device 31.

After concrete is poured, it generates heat of hydration, causing the temperature of the concrete to rise. The further away from the discharge pipe 2a the concrete is, the more difficult it is for heat to be released into the discharge path 2, so the temperature of the concrete increases the further away from the discharge pipe 2a. If the maximum temperature of the concrete is too high, the temperature gradient of the concrete around the discharge pipe 2a will increase, and cracks may occur.

Therefore, in this embodiment, after concrete is poured, a motor (not shown) is used to drive a cooling medium pump (cooling medium supply device) 22 to circulate the cooling medium through the second heat transfer medium flow pipe 20. The temperature of the cooling medium is adjusted to be lower than the temperature around the second heat transfer medium flow pipe 20, and the cooling medium cools the surroundings of the second heat transfer medium flow pipe 20 by flowing through the second heat transfer medium flow pipe 20. Since the second heat transfer medium flow pipe 20 is disposed farther from the discharge pipe 2a than the first heat transfer medium flow pipe 10, the concrete in the vicinity of the first heat transfer medium flow pipe 10 is cooled by releasing the heat of hydration to the discharge path 2, while the concrete in the vicinity of the second heat transfer medium flow pipe 20 is cooled by the cooling medium flowing through the second heat transfer medium flow pipe 20. Therefore, the maximum temperature of the concrete can be lowered, and the temperature gradient of the concrete around the discharge pipe 2a can be reduced. This makes it possible to prevent cracks.

The cooling medium continues to flow until the temperature of the poured concrete reaches its maximum temperature due to the heat of hydration. Whether the temperature of the concrete has reached its maximum temperature is determined based on the temperature measured using the optical fiber cable 30.

The optical fiber cable 30 has the property of slightly scattering the incident pulsed light backward, and the frequency of the scattered light depends on the temperature of the optical fiber cable 30. The temperature measuring device 31 measures the temperature based on the frequency of the scattered light generated in the optical fiber cable 30. Note that the temperature can be measured not only by the optical fiber cable 30, but also by using a thermometer different from the optical fiber cable 30, or by using a combination of a thermocouple (not shown) and the temperature measuring device 31.

After the temperature of the concrete reaches its maximum temperature, it gradually drops due to the release of heat of hydration. The closer the concrete is to the discharge pipe 2a, the more easily it is able to release heat into the discharge path 2, so the closer the concrete is to the discharge pipe 2a, the lower the temperature of the concrete. If the temperature of the concrete near the discharge pipe 2a becomes too low, the greater the temperature gradient of the concrete around the discharge pipe 2a, which may result in cracks.

In this embodiment, after the flow of the cooling medium is stopped, a motor (not shown) is used to drive a heating medium pump (heating medium supply device) 12 to circulate the heating medium through the first heat transfer medium flow pipe 10. The temperature of the heating medium is adjusted to be higher than the temperature around the first heat transfer medium flow pipe 10, and the heating medium heats the area around the first heat transfer medium flow pipe 10 by flowing through the first heat transfer medium flow pipe 10. Therefore, the concrete around the discharge pipe 2a is heated by the heating medium. This makes it possible to reduce the temperature gradient around the discharge pipe 2a. This makes it possible to prevent cracks.

The heating medium flows when the temperature measured using the optical fiber cable 30 is lower than a predetermined set temperature. Therefore, the concrete is heated by the heating medium in response to a decrease in the temperature of the concrete around the discharge pipe 2a. This makes it possible to further reduce the temperature gradient around the discharge pipe 2a.

The temperatures of the heating medium and the cooling medium are adjusted to a predetermined set temperature using a medium temperature adjustment device 40. The operation of the medium temperature adjustment device 40 is controlled by a medium temperature management device 50 based on the temperature information output from a temperature measuring device (temperature control device) 31.

Figure 4 is a graph showing an example of the set temperature. In Figure 4, the daily average air temperature is also shown. While the daily average air temperature drops with the onset of winter, the temperature of the poured concrete gradually drops over a span of several years (for example, about four years) as the release of heat of hydration is promoted after reaching the maximum temperature, and approaches the outside air temperature. In the winter of the first year after pouring the concrete, the difference between the temperature of the concrete and the daily average air temperature is large. Therefore, in order to reduce the temperature gradient of the concrete around the discharge pipe 2a, it is necessary to heat the concrete sufficiently. On the other hand, in the winter of the third year after pouring the concrete, for example, the difference between the temperature of the concrete and the daily average air temperature is small. Therefore, if the concrete is heated in the same way as in the winter of the first year after pouring the concrete, the concrete will be heated more than necessary, which will lead to a deterioration in the quality of the concrete embankment 100 and an increase in construction costs.

In this embodiment, as shown in FIG. 4, the set temperature is set to decrease with time from pouring the concrete. For example, the set temperature is set to T1 for up to one year after pouring the concrete, the set temperature is set to T2, which is lower than T1, for one to two years after pouring the concrete, and the set temperature is set to T3, which is lower than T2, for two to three years after pouring the concrete. This makes it possible to reduce the temperature gradient of the concrete around the discharge pipe 2a while preventing the concrete from overheating more than necessary. This makes it possible to prevent cracks and reduce the construction costs of the concrete embankment 100.

When the heating medium is circulating, it is preferable to provide an opening/closing door 4 (see FIG. 1) near the upstream and downstream openings of the discharge channel 2 and to keep the opening/closing door 4 closed. In this case, it is possible to prevent heat from escaping from the discharge channel 2. Therefore, it is possible to further reduce the temperature gradient of the concrete around the discharge pipe 2a.

After a sufficient amount of time (e.g., four years) has passed since the concrete was poured and the temperature of the poured concrete has approached the outside air temperature, the flow of the heating medium is stopped and the first heat transfer medium flow pipe 10 and the second heat transfer medium flow pipe 20 are filled with grout.

This completes the construction of the concrete embankment 100.

The above embodiment provides the following effects:

In this embodiment, a heating medium is circulated through the first heat transfer medium circulating pipe 10 arranged around the discharge pipe 2a. Therefore, the concrete around the discharge pipe 2a is heated by the heating medium. Therefore, the temperature gradient of the concrete around the discharge pipe 2a can be reduced. This makes it possible to prevent cracks.

The second heat transfer medium pipe 20 is placed farther from the discharge pipe 2a than the first heat transfer medium pipe 10, and a cooling medium is circulated through the second heat transfer medium pipe 20 after the concrete is poured. The concrete near the first heat transfer medium pipe 10 is cooled by releasing heat of hydration to the discharge path 2, while the concrete near the second heat transfer medium pipe 20 is cooled by the cooling medium circulating through the second heat transfer medium pipe 20. Therefore, the maximum temperature of the concrete can be lowered, and the temperature gradient of the concrete around the discharge pipe 2a can be reduced. This makes it possible to prevent cracks.

Furthermore, an optical fiber cable 30 is placed in the concrete along the discharge pipe 2a, and when the temperature measured using the optical fiber cable 30 is lower than the set temperature, a heating medium is circulated through the first heat transfer medium flow pipe 10. Therefore, the concrete is heated by the heating medium in response to a decrease in the temperature of the concrete around the discharge pipe 2a. This makes it possible to further reduce the temperature gradient around the discharge pipe 2a.

In the above embodiment, the flow of the heating medium is controlled based on the temperature measured using the optical fiber cable 30, but the heating medium may be circulated during the low temperature season of the year without using the temperature measured using the optical fiber cable 30. In this case, the optical fiber cable 30 and the temperature measuring device 31 are unnecessary, and the construction cost of the concrete embankment 100 can be reduced. The low temperature season is, for example, a period when the daily average temperature is 5°C or lower. The low temperature season may also be a period when the daily average temperature is below the annual average temperature.

In the above embodiment, the cooling medium is circulated through the second heat transfer medium pipe 20 until the temperature of the poured concrete reaches the maximum temperature due to the heat of hydration, but the cooling medium may be circulated through the second heat transfer medium pipe 20 even after the maximum temperature is reached. In other words, the heating medium may be circulated through the first heat transfer medium pipe 10 while the cooling medium is circulating through the second heat transfer medium pipe 20.

In addition, in the above embodiment, the concrete is cooled by circulating a cooling medium through the second heat transfer medium flow pipe 20, but it is not necessary to circulate a cooling medium through the second heat transfer medium flow pipe 20. In this case, it is not necessary to arrange the second heat transfer medium flow pipe 20 around the discharge pipe 2a.

In addition, in the above embodiment, the heating medium is circulated through the first heat transfer medium flow pipe 10 after the temperature of the poured concrete reaches its maximum temperature due to the heat of hydration, but the heating medium may be circulated through the first heat transfer medium flow pipe 10 before the temperature of the poured concrete reaches its maximum temperature due to the heat of hydration.

In addition, the first heat transfer medium flow pipe 10 and the second heat transfer medium flow pipe 20 may be connected to each other and communicated, and the heating medium (heat transfer medium) cooled by flowing through the first heat transfer medium flow pipe 10 may be circulated as a cooling medium through the second heat transfer medium flow pipe 20, or the cooling medium (heat transfer medium) heated by flowing through the second heat transfer medium flow pipe 20 may be circulated as a heating medium through the first heat transfer medium flow pipe 10. In other words, the heat transfer medium (water) flowing through one of the first heat transfer medium flow pipe 10 and the second heat transfer medium flow pipe 20 may be circulated through the other. The temperature gradient around the discharge pipe 2a can be made smaller by circulating the heat transfer medium (water) as a cooling medium through the second heat transfer medium circulating pipe 20 while circulating the heat transfer medium (water) with an increased temperature through the first heat transfer medium circulating pipe 10 as a heating medium, or by circulating the heat transfer medium (water) as a heating medium through the first heat transfer medium circulating pipe 10 while circulating the heat transfer medium (water) with a decreased temperature through the second heat transfer medium circulating pipe 20 as a cooling medium. In addition, since there is no need to regulate the temperature of the heat transfer medium using the medium temperature regulating device 40, the construction cost of the concrete embankment 100 can be reduced.

The heating medium (heat transfer medium) cooled by flowing through the first heat transfer medium flow pipe 10 may be circulated as a cooling medium through the second heat transfer medium flow pipe 20, and the cooling medium (heat transfer medium) heated by flowing through the second heat transfer medium flow pipe 20 may be circulated as a heating medium through the first heat transfer medium flow pipe 10. In other words, the heat transfer medium (water) may be circulated between the first heat transfer medium flow pipe 10 and the second heat transfer medium flow pipe 20. In this case, too, the temperature gradient around the discharge pipe 2a can be made smaller, and the construction cost of the concrete embankment 100 can be reduced.

Second Embodiment
Next, a method for constructing a concrete embankment 200 according to a second embodiment of the present invention will be described with reference to Figures 5 and 6. Figure 5(a) is a plan view of the concrete embankment 200, and Figure 5(b) is a cross-sectional view taken along line VB-VB in Figure 5(a). In Figures 5(a) and 5(b), the discharge channel 2 and the inspection gallery 3 shown in Figure 1 are omitted.

As shown in Figures 5(a) and (b), the concrete embankment 200 comprises a left bank embankment 201 constructed on the left side as viewed from the upstream side, and a right bank embankment 202 constructed on the right side. In the method of constructing the concrete embankment 200, the left bank embankment 201 is constructed first, and then the right bank embankment 202 is constructed.

When the right bank embankment 202 has not been constructed, the heat of hydration in the left bank embankment 201 is released from the right side 201a of the left bank embankment 201. This causes a temperature gradient in the concrete near the right side 201a of the left bank embankment 201. If the temperature gradient is large, excessive tensile stress is generated in the concrete, which may cause cracks in the left bank embankment 201.

In addition, construction of the right bank embankment 202 begins after construction of the left bank embankment 201 is completed (for example, with a time lag of about three years). Therefore, the heat of hydration of the left bank embankment 201 is released and the temperature of the left bank embankment 201 drops. If the right bank embankment 202 is constructed in this state, the left side surface 202a of the right bank embankment 202 is cooled by the left bank embankment 201, and a temperature gradient of the concrete occurs near the left side surface 202a of the right bank embankment 202. If the temperature gradient is large, excessive tensile stress will be generated in the concrete, and there is a risk of cracks occurring in the right bank embankment 202.

In this embodiment, the concrete near the right side 201a of the left bank embankment 201 is heated using a configuration described below. This makes it possible to reduce the temperature gradient of the concrete near the right side 201a of the left bank embankment 201. This makes it possible to prevent cracks in the left bank embankment 201.

When constructing the right bank embankment 202, the concrete for the right bank embankment 202 is poured while the concrete near the right side 201a of the left bank embankment 201 is heated. This makes it possible to reduce the temperature gradient of the concrete near the left side 202a of the right bank embankment 202. This makes it possible to prevent cracks in the right bank embankment 202.

Figure 6 is a diagram for explaining a method for constructing the concrete embankment 200. Figures 6(a), (c), and (e) are cross-sectional views corresponding to Figure 5(b), and Figures 6(b), (d), and (f) are cross-sectional views along lines VIB-VIB, VID-VID, and VIF-VIF shown in Figures 6(a), (c), and (e), respectively. In Figure 6, the two-dot chain lines indicate the final contours of the left bank embankment 201 and the right bank embankment 202.

In the method of constructing the concrete embankment 200, first, as shown in Figures 6(a) and (b), the frame body 261a is placed on the ground away from the left bank, the frame body 261b is placed between the left bank and the frame body 261a, and the frame body 261c is placed downstream of the frame body 261b between the left bank and the frame body 261a. The left bank and the frame bodies 261a, 261b, and 261c define a concrete pouring area for constructing the left bank side embankment 201. The frame bodies 261a, 261b, and 261c are side forming formworks that form the right side 201a, downstream side 201b, and upstream side 201c of the left bank side embankment 201, respectively.

Next, the first heat transfer medium flow pipe 10 is arranged along the frame 261a. The first heat transfer medium flow pipe 10 is supported and installed on a stand or steel material (not shown) in a continuous state by being folded back alternately on the upstream side and downstream side.

Next, concrete is poured into the concrete pouring area defined by the left bank and the frames 261a, 261b, and 261c. This causes the first heat transfer medium flow pipe 10 to be covered with concrete.

Although not shown in the figure, after the concrete hardens, the frames 261a, 261b, and 261c are slid upward to define a new concrete pouring area, a new first heat transfer medium flow pipe 10 is placed along the frame 261a, and new concrete is poured into the concrete pouring area.

By repeating the process of defining the concrete pouring area, arranging the first heat transfer medium flow pipe 10, and pouring concrete, pouring of concrete in the left bank embankment 201 is completed as shown in Figures 6(c) and (d). After pouring of concrete in the left bank embankment 201 is completed, the frame bodies 261a, 261b, and 261c are removed to expose the right side 201a, downstream side 201b, and upstream side 201c of the left bank embankment 201. The frame bodies 261a, 261b, and 261c may not be removed and may be left in place, for example, as buried formwork.

Next, the heating medium is circulated through the first heat transfer medium pipe 10. The first heat transfer medium pipe 10 is arranged along the frame 261a that forms the right side 201a of the left bank embankment 201, so that the concrete near the right side 201a of the left bank embankment 201 is heated by the heating medium. This makes it possible to reduce the temperature gradient of the concrete near the right side 201a of the left bank embankment 201. This makes it possible to prevent cracks in the left bank embankment 201.

When circulating the heating medium, the first heat transfer medium circulating pipe 10 is connected to the heating medium tank 11 shown in FIG. 3, as in the first embodiment, and the heating medium pump 12 is driven using a motor (not shown).

Next, as shown in Figures 6(e) and (f), frame body 262b is placed between the right bank and the left bank embankment 201, and frame body 262c is placed between the right bank and the left bank embankment 201, upstream of frame body 262b. The right side surface 201a of the right bank and left bank embankment 201 and frame bodies 262b and 262c define a concrete pouring area for constructing the right bank embankment 202. In other words, the right side surface 201a of the left bank embankment 201 functions as a side surface forming formwork that forms the left side surface 202a of the right bank embankment 202.

Next, a heating medium is circulated through the first heat transfer medium flow pipe 10 to heat the right side surface 201a of the left bank embankment 201, and new concrete is poured into the concrete pouring area defined by the right bank, the right side surface 201a of the left bank embankment 201, and the frame bodies 262b and 262c. This makes it possible to prevent the left side surface 202a of the right bank embankment 202 from being cooled by the left bank embankment 201. This makes it possible to reduce the temperature gradient of the concrete near the left side surface 202a of the right bank embankment 202. This makes it possible to prevent cracks in the right bank embankment 202.

After the concrete has hardened, the frames 262b and 262c are slid upward to define a new concrete pouring area and pour the concrete. By repeating the process of defining the concrete pouring area and pouring the concrete, pouring of the concrete in the right bank embankment 202 is completed.

The concrete in the right bank embankment 202 may be poured while the heating medium is flowing through the first heat transfer medium flow pipe 10, or, if the right side surface 201a of the left bank embankment 201 is sufficiently heated, it may be poured with the flow of the heating medium through the first heat transfer medium flow pipe 10 stopped.

The above embodiment provides the following effects:

In this embodiment, the first heat transfer medium flow pipe 10 is arranged along the frame 261a that forms the right side surface 201a of the left bank side embankment 201. Therefore, the concrete near the right side surface 201a of the left bank side embankment 201 is heated by the heating medium. Therefore, the temperature gradient of the concrete near the right side surface 201a of the left bank side embankment 201 can be reduced. This makes it possible to prevent cracks in the left bank side embankment 201.

In addition, in this embodiment, a heating medium is circulated through the first heat transfer medium flow pipe 10 to heat the right side surface 201a of the left bank embankment 201, and new concrete is poured in the area facing the right side surface 201a. This makes it possible to prevent the left side surface 202a of the right bank embankment 202 from being cooled by the left bank embankment 201. This makes it possible to reduce the temperature gradient of the concrete near the left side surface 202a of the right bank embankment 202. This makes it possible to prevent cracks in the right bank embankment 202.

In the above embodiment, a case has been described in which the left bank embankment 201 is constructed first, followed by the right bank embankment 202, but the present invention is also applicable to a case in which the left bank embankment 201 is constructed first, followed by the right bank embankment 202.

In the second embodiment, similar to the first embodiment, before pouring the concrete of the left bank side embankment 201, the second heat transfer medium flow pipe 20 may be positioned farther from the frame body 261a than the first heat transfer medium flow pipe 10, and a cooling medium may be circulated through the second heat transfer medium flow pipe 20 after pouring the concrete.

When the second heat transfer medium pipe 20 is disposed farther from the frame 261a than the first heat transfer medium pipe 10, the first heat transfer medium pipe 10 and the second heat transfer medium pipe 20 may be connected to each other to communicate with each other, and the heat transfer medium (water) that has flowed through one of the first heat transfer medium pipe 10 and the second heat transfer medium pipe 20 may be circulated between the first heat transfer medium pipe 10 and the second heat transfer medium pipe 20. In this case, the temperature gradient of the concrete near the right side surface 201a of the left bank side embankment 201 can be made smaller, and the construction cost of the concrete embankment 200 can be reduced.

In the second embodiment, similarly to the first embodiment, the optical fiber cable 30 may be arranged along the frame body 261a before pouring the concrete of the left bank embankment 201, and after pouring the concrete, if the temperature measured using the optical fiber cable 30 is lower than the set temperature, a heating medium may be circulated through the first heat transfer medium flow pipe 10.

The heating medium may be circulated through the first heat transfer medium pipe 10 during the low temperature season of the year.

In the second embodiment, the first heat transfer medium flow pipe 10 may be arranged along the right side surface 201a of the left bank side embankment 201 before the concrete of the right bank side embankment 202 is poured, and the heating medium may be circulated through the first heat transfer medium flow pipe 10 after the concrete is poured. In this case, the second heat transfer medium flow pipe 20 may be arranged farther from the right side surface 201a of the left bank side embankment 201 than the first heat transfer medium flow pipe 10 before the concrete of the right bank side embankment 202 is poured, and the cooling medium may be circulated through the second heat transfer medium flow pipe 20 after the concrete is poured. In this case, the optical fiber cable 30 may be arranged along the right side surface 201a of the left bank side embankment 201 before the concrete of the right bank side embankment 202 is poured, and the heating medium may be circulated through the first heat transfer medium flow pipe 10 after the concrete is poured if the temperature measured using the optical fiber cable 30 is lower than the set temperature.

When the second heat transfer medium flow pipe 20 is disposed farther from the right side surface 201a of the left bank side embankment 201 than the first heat transfer medium flow pipe 10, the first heat transfer medium flow pipe 10 and the second heat transfer medium flow pipe 20 may be connected to each other and communicated, and the heat transfer medium (water) flowing through one of the first heat transfer medium flow pipe 10 and the second heat transfer medium flow pipe 20 may be circulated between the first heat transfer medium flow pipe 10 and the second heat transfer medium flow pipe 20. In this case, the temperature gradient of the concrete near the left side surface 202a of the right bank side embankment 202 can be made smaller, and the construction cost of the concrete embankment 200 can be reduced.

Although the embodiments of the present invention have been described above, the above embodiments merely show some of the application examples of the present invention, and are not intended to limit the technical scope of the present invention to the specific configurations of the above embodiments.

100, 200...Concrete embankment 2a...Discharge pipe (frame, passage section)
10: First heat transfer medium flow pipe 20: Second heat transfer medium flow pipe 30: Optical fiber cable (thermometer)
201: Left bank side embankment 201a: Right side surface 202: Right bank side embankment 202a: Left side surface 261a: Frame body (side surface forming formwork)

Claims (6)

A method for constructing a concrete embankment, comprising the steps of:
A first heat transfer medium flow pipe is disposed along a frame defining a concrete pouring area;
Pouring concrete in the concrete pouring area so as to cover the periphery of the first heat transfer medium flow pipe;
A construction method in which a heating medium is circulated through the first heat transfer medium circulating pipe after the concrete is poured,
The frame is a passage portion that forms a passage inside the concrete bank ,
The first heat transfer medium flow pipe is disposed around the passage portion.
Methods for constructing concrete embankments. A method for constructing a concrete embankment, comprising the steps of:
A first heat transfer medium flow pipe is disposed along a frame defining a concrete pouring area;
Pouring concrete in the concrete pouring area so as to cover the periphery of the first heat transfer medium flow pipe;
A method for circulating a heating medium through the first heat transfer medium flow pipe after the concrete is poured,
The frame is a side surface forming formwork that forms a side surface of a part of the concrete embankment,
The first heat transfer medium flow pipe is disposed along the side forming form;
After pouring the concrete, the side forming formwork is removed to expose the side surface;
The heating medium is circulated through the first heat transfer medium flow pipe, and new concrete is poured in the area where the side surface faces while the side surface is heated.
Methods for constructing concrete embankments. Before pouring the concrete, a second heat transfer medium flow pipe is disposed farther from the frame than the first heat transfer medium flow pipe;
The concrete is poured so as to cover the periphery of the second heat transfer medium flow pipe;
After the concrete is poured, a cooling medium is circulated through the second heat transfer medium circulating pipe.
A method for constructing a concrete embankment according to claim 1 or 2 . the first heat transfer medium flow pipe and the second heat transfer medium flow pipe are connected to each other, and the heating medium cooled by flowing through the first heat transfer medium flow pipe is caused to flow through the second heat transfer medium flow pipe as the cooling medium, or the cooling medium heated by flowing through the second heat transfer medium flow pipe is caused to flow through the first heat transfer medium flow pipe as the heating medium.
A method for constructing a concrete embankment according to claim 3 . Before pouring the concrete, a thermometer is arranged along the frame;
5. A method for constructing a concrete embankment as described in any one of claims 1 to 4 , further comprising the step of circulating the heating medium through the first heat transfer medium flow pipe when the temperature measured by the thermometer after the concrete has been poured is lower than a set temperature. The heating medium is circulated through the first heat transfer medium circulating pipe during the low temperature season of the year.
A method for constructing a concrete embankment according to any one of claims 1 to 4 .