Piping structure of cooling pipes in vertical pipe cooling method

Abstract

To provide a piping structure of a cooling pipe in a vertical pipe cleaning method which easily dissolves air accumulation generated in a cooling pipeline, and can smoothly press-feed cooling water.SOLUTION: A cooling pipeline 11 including a plurality of vertical cooling pipes 12 is arranged inside a mold 21, cooling water is pressure-fed to the cooling pipeline 11, and thereby temperature rise of placed concrete 22 is suppressed by heat exchange. The cooling pipeline 11 is formed by connecting upper ends 12a and lower ends 12b of the vertical cooling pipes 12 using upper connection pipes 13 and lower connection pipes 14. At least a part of the upper connection pipes 13 is arranged above top end surfaces 22a of the placed concrete 22, air bleeding parts 15 are provided on the upper connection pipes 13 in a part arranged above the top end surfaces 21a, and air remaining in the cooling pipeline 11 as air accumulation is removed.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a piping structure of cooling pipes in a vertical pipe cooling method. [Background technology]

[0002] For example, in concrete structures made of mass concrete, there is concern that thermal cracking may occur due to the hydration reaction of cement after the concrete is poured. For this reason, it is desirable to consider countermeasures against cracking from both the material and construction aspects, preferably through thermal stress analysis, and to select an appropriate construction method.

[0003] Furthermore, the pipe cooling method is known as one of the construction countermeasures against cracks in concrete structures. There are two types of pipe cooling methods: for example, the horizontal pipe cooling method, which uses thin-walled steel pipes with an inner diameter of about 25 mm, is mainly applied to large, flat concrete structures such as dam concrete, while for narrow, long concrete structures with a high lift height such as bridge piers and columns, the vertical pipe cooling method, which uses sheathed pipes (box-punched pipes) with an inner diameter of about 55 mm, is mainly applied.

[0004] In the vertical pipe cooling method, as shown in Figure 6, for example, before pouring concrete, multiple sheath pipes are installed inside a formwork so that they extend vertically (vertically), and after pouring the concrete, flexible water supply hoses are inserted up to the bottom ends of the sheath pipes, and cooling water is passed through the inserted water supply hoses into the insides of the sheath pipes, thereby lowering the temperature of the concrete around the sheath pipes through heat exchange (see, for example, Non-Patent Document 1). In addition, the water discharged from the top ends of the sheath pipes after heat exchange is allowed to flow directly onto the finished surface of the concrete and is also used as curing water. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2021-11686 [Non-patent literature]

[0006] [Non-Patent Document 1] Proceedings of the Japan Concrete Institute, Vol. 36, No. 1, 2014, P1504-1509 Summary of the Invention [Problem to be solved by the invention]

[0007] On the other hand, in the vertical pipe cooling method, as described above, if the post-heat-exchange water discharged from the upper end of the sheath pipe is used as curing water by directly flowing it onto the finished surface of the concrete, it is thought that if the drained curing water contains metal ions or if the hydrogen ion concentration of the drained curing water is high, for example, if the pH is 5 or less, it may affect the concrete structure that is being formed. For this reason, it has been considered to pump cooling water from one end of a cooling piping path formed by connecting multiple vertical (vertical) pipes arranged inside the formwork, and collect the post-heat-exchange water from the other end, and then discard the collected water without using it as curing water, or circulate it through a cooling device and reuse it as cooling water (see, for example, Patent Document 1).

[0008] However, when cooling water is pumped from one end of a cooling pipe formed by connecting multiple vertical pipes as in Patent Document 1, for example, if the pumping of cooling water is started when the cooling pipe is empty and no water is stagnating, air inside the cooling pipe tends to remain as air pockets as the pressure-fed cooling water moves back and forth up and down through the continuous cooling pipe, which can make it difficult to pump the cooling water smoothly, especially if the flow path from one end to the other of the cooling pipe is long.In addition, this can make it difficult to remove the cooling pipe from the concrete structure after cooling the concrete, or to repair or reinforce the concrete structure by filling the cooling pipe with a hardening material.

[0009] An object of the present invention is to provide a piping structure for cooling pipes in a vertical pipe cooling method, which can easily eliminate air pockets that occur in the cooling pipe when cooling water is circulated through a cooling pipe path formed preferably by connecting a plurality of vertical pipes (vertical cooling pipes) and heat exchanged between the cooled water and poured concrete, thereby enabling the cooling water to be smoothly pumped from one end of the cooling pipe path to the other, and which can also facilitate the removal of the cooling pipe path from the concrete structure after cooling the concrete, and the filling of a hardening material into the cooling pipe path to repair and reinforce the concrete structure. [Means for solving the problem]

[0010] The present invention provides a piping structure for cooling pipes in a vertical pipe cooling method, in which a cooling piping path formed by a plurality of vertical cooling pipes arranged extending vertically is arranged inside a formwork into which concrete is poured, and cooling water is pumped from one end of the arranged cooling piping path and the pumped water is allowed to flow out from the other end after heat exchange with the poured concrete, thereby suppressing a temperature rise of the poured concrete. The cooling piping path is formed by connecting upper and lower ends of the plurality of vertical cooling pipes using an upper connecting pipe and a lower connecting pipe, respectively, and the above-mentioned object is achieved by providing a piping structure for cooling pipes in a vertical pipe cooling method, in which at least a part of the upper connecting pipe is arranged above the top surface of the poured concrete.

[0011] Furthermore, it is preferable that the piping structure of the cooling pipe in the vertical pipe cooling method of the present invention is provided with an air vent section in the upper connecting pipe located above the top surface of the poured concrete, so that air remaining as air pockets in the cooling piping can be removed.

[0012] In addition, the piping structure of the cooling pipe in the vertical pipe cooling method of the present invention is preferably such that the vertical cooling pipe is made of a box-punched pipe such as a sheath pipe.

[0013] Furthermore, in the piping structure of the cooling pipe in the vertical pipe cooling method of the present invention, it is preferable that the upper connecting pipe is made of a flexible piping material.

[0014] Furthermore, in the piping structure of the cooling pipe in the vertical pipe cooling method of the present invention, it is preferable that the outer diameter of the upper connecting pipe is smaller than the inner diameter of the vertical cooling pipe, and that gap tape that fills the gap between the outer surface of the upper connecting pipe and the inner surface of the vertical cooling pipe is wrapped around the outer peripheral portion of the connection end of the upper connecting pipe, and the connection end wrapped with the gap tape is pushed inside the upper end of the vertical cooling pipe, and a solidifying material is filled in the gap above the pushed-in gap tape and solidified, thereby liquid-tightly connecting the upper connecting pipe to the upper end of the vertical cooling pipe.

[0015] Furthermore, in the piping structure of the cooling pipes in the vertical pipe cooling method of the present invention, it is preferable that the outer diameter of the upper connecting pipe is smaller than the inner diameter of the vertical cooling pipe, and that a gap tape covering the gap between the outer peripheral surface of the upper connecting pipe and the inner peripheral surface of the vertical cooling pipe is wrapped around the outer peripheral portion of the connection end of the upper connecting pipe, and the connection end wrapped with the gap tape is pushed into a joint pipe, and the connection end pushed into the joint pipe is inserted inside the upper end of the vertical cooling pipe until the gap tape abuts against the upper end of the vertical cooling pipe, and a solidifying material is filled in the gap between the joint pipe and the vertical cooling pipe above the abutting gap tape and solidified, thereby liquid-tightly connecting the upper connecting pipe to the upper end of the vertical cooling pipe.

[0016] Furthermore, in the piping structure of the cooling pipe in the vertical pipe cooling method of the present invention, it is preferable that a sealing material is arranged in the gap between the inner surface of the joint pipe below the gap tape and the outer surface of the upper end of the vertical cooling pipe. [Effects of the Invention]

[0017] According to the piping structure of the cooling pipes in the vertical pipe cooling method of the present invention, when cooling water is circulated through a cooling piping path preferably formed by connecting a plurality of vertical piping (vertical cooling pipes) and heat is exchanged between the poured concrete and the cooling water, air pockets that form in the cooling piping path can be easily eliminated, making it possible to smoothly pump the cooling water from one end of the cooling piping path to the other end, and also making it easier to remove the cooling piping path from the concrete structure after the concrete has cooled, or to fill the cooling piping path with a hardening material to repair or reinforce the concrete structure. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is an explanatory diagram of a piping structure of a cooling pipe in a vertical pipe cooling method according to a preferred embodiment of the present invention. FIG. [Figure 2] FIG. 2 is an exploded perspective view illustrating an example of an air vent hardware that forms the air vent portion. [Figure 3] 10 is an explanatory diagram illustrating a connection structure for connecting an upper connecting pipe to the upper end of a vertical cooling pipe. FIG. [Figure 4] 10 is an explanatory diagram illustrating a connection structure for connecting the lower end of a vertical cooling pipe to a lower connecting pipe. FIG. [Figure 5] 10 is an explanatory diagram illustrating another connection structure for connecting an upper connecting pipe to the upper end of a vertical cooling pipe. FIG. [Figure 6] FIG. 1 is a schematic perspective view illustrating a conventional vertical pipe cooling method. DETAILED DESCRIPTION OF THE INVENTION

[0019] A cooling pipe piping structure 10 (see FIG. 1) in a vertical pipe cooling method according to a preferred embodiment of the present invention is employed as a piping structure for preventing cracks from occurring in a concrete structure 20, such as a bridge pier, which is a substructure of a viaduct, when the concrete 22 poured inside a formwork 21 (see FIG. 1) assembled inside a temporary cofferdam 23 is constructed preferably by a pneumatic caisson method (see FIG. 6). The concrete 22 is cooled by cooling water flowing through cooling piping paths 11 with multiple vertical cooling pipes 12, thereby preventing cracks from occurring in the concrete structure 20. In this embodiment, the viaduct pier, which is the concrete structure 20, is a narrow, long structure with a high lift height, for example, approximately 4 m wide in the bridge axis direction, approximately 7 m wide perpendicular to the bridge axis, and approximately 25 m high. The vertical pipe cooling method is employed as a means for effectively suppressing the temperature rise during hardening of the poured concrete and preventing cracks from occurring.

[0020] The piping structure 10 of this embodiment has a function of easily eliminating air pockets that occur in the cooling piping 11 and enabling the cooling water to be smoothly pumped from one end 11a to the other end 11b of the cooling piping 11 when cooling water is circulated through the cooling piping 11, which is a continuous line of multiple vertical cooling pipes 12 arranged in a vertical direction, in such a vertical pipe cooling method, and heat exchange is performed between the cooling water and the poured concrete 22.

[0021] 1, the cooling pipe piping structure 10 in the vertical pipe cooling method of this embodiment is a piping structure in which a cooling pipe passage 11 formed by including a plurality of vertical cooling pipes 12 arranged extending vertically is arranged inside a formwork 21 into which concrete 22 is poured, and cooling water is pumped from one end 11a of the arranged cooling pipe passage 11, and the pumped water, after heat exchange with the poured concrete 22, flows out from the other end 11b, thereby suppressing a temperature rise of the poured concrete 22. In this embodiment, the cooling pipe passage 11 is formed by connecting upper ends 12a and lower ends 12b of the plurality of vertical cooling pipes 12 using an upper connecting pipe 13 and a lower connecting pipe 14, respectively, and at least a portion of the upper connecting pipe 13 is arranged above a top surface 22a of the poured concrete 22. Preferably, an air vent 15 is provided in the upper connecting pipe 13 at a portion located above the top surface 21a of the poured concrete 22, so that air remaining as an air pocket in the cooling piping 11 can be removed.

[0022] In this embodiment, the vertical cooling pipes 12 constituting the cooling piping passage 11 can be sheathed pipes with an inner diameter of, for example, about 60 mm. This sheathed pipe is a known piping material known as a box-shaped pipe, which forms a box-cut section for installing steel wires in, for example, prestressed concrete structures. The sheathed pipes may also be helical pipes formed by spirally wrapping a strip of thin metal sheet. By using helical pipes as sheathed pipes, after pipe cooling is completed, the vertical cooling pipes 12 can be removed from the box-cut section of the concrete by gradually lifting the spirally wrapped thin metal sheet upward from its upper end while unwrapping it. In particular, at least a portion of the upper connecting pipe 13 connected to the vertical cooling pipes 12 made of sheathed pipes is positioned above the top surface 22a of the poured concrete 22, which makes the removal of the vertical cooling pipes 12 smoother and easier.

[0023] In this embodiment, a plurality of vertical cooling pipes 12, for example, made of sheath pipes, are attached in a dispersed arrangement inside the formwork 21, before the concrete 22 is poured, in a state in which they extend parallel to each other in the vertical direction, preferably in the vertical direction, at a pitch of, for example, about 600 mm to 1000 mm. These plurality of vertical cooling pipes 12 constitute a unit, for example, consisting of several to several tens of pipes, and the upper end 12a and the lower end 12b of the vertical cooling pipes 12 in each unit are connected to each other using an upper connecting pipe 13 and a lower connecting pipe 14, respectively, and are also connected to a raw water tank 24 that stores cooling water, thereby forming a cooling piping path 11 in which a plurality of vertical cooling pipes 12 are continuous for each unit.

[0024] The upper connecting pipe 13 connecting the upper ends 12a of the vertical cooling pipes 12 to each other is preferably made of a flexible piping material, for example, a water supply hose with a thickness of about 1 inch, and is attached liquid-tightly with an air vent portion 15 (described later) interposed therebetween and in an appropriately curved state, preferably so as to connect the upper ends of each pair of adjacent vertical cooling pipes 12 to each other.

[0025] Here, the outer diameter of the upper connecting pipe 13 is smaller than the inner diameter of the vertical cooling pipe 12, and a gap will be generated at the connection between them. Preferably, as shown in Figure 3, a gap tape 16a that fills the gap between the outer peripheral surface of the upper connecting pipe 13 and the inner peripheral surface of the vertical cooling pipe 12 is wrapped around the outer peripheral part of the connection end 13a of the upper connecting pipe 13, and the connection end 13a wrapped with this gap tape 16a is pushed into the inside of the upper end 12a of the vertical cooling pipe 12, and a solidifying material 17a, such as mortar, is filled into the gap above the pushed-in gap tape 16a and solidified, thereby making it possible to connect the upper connecting pipe 13 to the upper end 12a of the vertical cooling pipe 12 in a liquid-tight manner.

[0026] Preferably, as shown in FIG. 5, a gap tape 16b that covers the gap between the outer peripheral surface of the upper connecting pipe 13 and the inner peripheral surface of the vertical cooling pipe 12 is wrapped around the outer peripheral portion of the connecting end 13a of the upper connecting pipe 13, and the connecting end 13a wrapped with this gap tape 16b is pushed into the joint pipe 18, and the connecting end 13a pushed into the joint pipe 18 is inserted inside the upper end 12a of the vertical cooling pipe 12 until the gap tape 16b abuts against the upper end of the vertical cooling pipe 12, and a solidifying material 17b, for example, mortar is filled in the gap between the joint pipe 18 and the vertical cooling pipe 12 above the abutting gap tape 16b and solidified, thereby making it possible to connect the upper connecting pipe 13 liquid-tight to the upper end 12a of the vertical cooling pipe 12.

[0027] In this case, there is a risk of cooling water leaking from the gap between the inner peripheral surface of the joint pipe 18 below the gap tape 16b and the outer peripheral surface of the upper end 12a of the vertical cooling pipe 12. Therefore, it is preferable to provide a sealing material 19, such as a sealing tape, in the gap between the inner peripheral surface of the joint pipe 18 and the outer peripheral surface of the upper end 12a of the vertical cooling pipe 12 to seal it liquid-tight.

[0028] The lower connecting pipe 14 connecting the lower ends 12b of the vertical cooling pipes 12 to each other is preferably a bent pipe bent into a U-shape, and can be made of a steel pipe with an inner diameter of about 75 mm, as shown in Fig. 4. The lower connecting pipe 14 can be made into a bent pipe bent into a U-shape by integrally connecting elbow pipes 14d to both ends of a straight pipe 14b via joint metal fittings 14c.

[0029] Here, the outer diameter of the vertical cooling pipe 12 is smaller than the inner diameter of the lower connecting pipe 14, and a gap occurs at the connection between them. Preferably, a gap tape 16c that fills the gap between the outer peripheral surface of the vertical cooling pipe 12 and the inner peripheral surface of the lower connecting pipe 14 is wrapped around the outer peripheral part of the lower end 12b of the vertical cooling pipe 12, and the lower end 12b wrapped with this gap tape 16c is pushed into the inside of the connecting end 14a of the lower connecting pipe 14, and at the same time, a solidifying material such as mortar is filled into the gap above the pushed-in gap tape 16c and allowed to solidify, thereby making it possible to connect the lower end 12b of the vertical cooling pipe 12 to the lower connecting pipe 14 in a liquid-tight manner.

[0030] Alternatively, a flexible sheathed pipe, preferably one that has the same inner diameter as the vertical cooling pipe 12 and is bent into a U-shape, can be used as the lower connecting pipe 14. The bent flexible sheathed pipe lower connecting pipe 14 can be connected to the lower end of the vertical cooling pipe 12 via a known sheath pipe joint, and can be connected to the vertical cooling pipe 12 in a liquid-tight manner by applying a waterproofing treatment.

[0031] 1, an air vent 15 for removing air remaining as air pockets in the cooling piping 11 is provided in each upper connecting pipe 13, preferably in a portion located above the top surface 22a of the poured concrete 22. The air vent 15 can be formed using any of a variety of known air vent valves, and preferably, as shown in FIG. 2, one configured by detachably screwing a valve body 15a and a pair of hose couplings 15c to a T-joint 15b can be used.

[0032] The above-mentioned cooling piping 11, which is formed by connecting a plurality of vertical cooling pipes 12 via upper connecting pipes 13 and lower connecting pipes 14, is disposed inside the formwork 21 before concrete is poured, and one end 11a is connected, preferably via a flexible sheath pipe 25 or the like, to a pressure pump 24a installed in a raw water tank 24 (see Figure 6) in which raw water to be used as cooling water is stored, for example, pumped up by a water intake pump from a river around the cofferdam 23.

[0033] After concrete is poured into the formwork 21, the pressure pump 24a installed in the raw water tank 24 is operated to pump cooling water made from raw water at a predetermined flow rate through the cooling piping 11 from one end 11a to the other end 11b at a predetermined flow rate. The cooling water pumped by the pressure pump 24a exchanges heat with the surrounding concrete 22, suppressing the temperature rise caused by the hydration reaction of the concrete 22, and flows up and down through the cooling piping, reaching the other end 11b. The pumped water that has reached the other end of the cooling piping 11 after heat exchange is preferably not used as curing water, but can be discharged into a nearby river for disposal, or discharged into the raw water tank 24 for collection, allowing it to be recycled.

[0034] According to the cooling pipe piping structure 10 in the vertical pipe cooling method of this embodiment having the above-mentioned configuration, when cooling water is circulated through the cooling piping passage 11, which is preferably formed by connecting a plurality of vertical cooling pipes 12, and heat is exchanged between the poured concrete 22 and the cooling water, air pockets formed in the cooling piping passage 11 can be easily eliminated, and the cooling water can be smoothly pumped from one end 11a to the other end 11b of the cooling piping passage 11. Furthermore, after the concrete 22 has been cooled, it becomes easier to remove the cooling piping passage 11 from the concrete structure 20, and to fill the cooling piping passage with a hardening material to repair or reinforce the concrete structure.

[0035] That is, according to the piping structure 10 of this embodiment, at least a portion of the upper connecting pipe 13 is positioned above the top surface 22a of the poured concrete 22, and an air vent section 15 is provided in the portion of the upper connecting pipe 13 positioned above this top surface 21a, so that air remaining as air pockets in the cooling piping 11 can be removed. Therefore, even if the pressure transfer of the cooling water is hindered due to the influence of air pockets formed inside the cooling piping 11 that moves back and forth up and down, the remaining air can be removed by, for example, operating the air vent section 15 of one or more upper connecting pipes 13 where air pockets are expected to have formed, thereby removing the air from the cooling piping 11, thereby eliminating the air pocket that is hindering the pressure transfer of the cooling water without excessively increasing the pressure transfer pressure of the pressure pump 24a, and making it possible to smoothly pressure transfer the cooling water.

[0036] Furthermore, as described above, at least a part of the upper connecting pipe 13 connected to the vertical cooling pipe 12 made of, for example, a sheath pipe is arranged above the top surface 22a of the poured concrete 22, so that the work of removing the vertical cooling pipe 12 can be preferably carried out more smoothly and easily, and also, with the vertical cooling pipe 12 remaining in place or after being removed, a solidifying material such as grout can be smoothly filled into the cooling piping 11 preferably by working from the top surface 22a of the concrete 22, so that the work of repairing and reinforcing the concrete structure can be easily carried out.

[0037] The present invention is not limited to the above-described embodiment and various modifications are possible. For example, it is not necessary to provide an air vent portion on all upper connecting pipes connecting the upper ends of the vertical cooling pipes. An air vent portion can be provided only on one or more upper connecting pipes where air accumulation is expected. The upper connecting pipe does not necessarily have to be a water supply hose. It can be made of other flexible piping materials such as flexible sheath pipes, or inflexible piping materials such as metal. In addition to the air vent portion shown in FIG. 2, various known air vent valves can also be used. It is not necessary to provide an air vent portion on the upper connecting pipe located above the top surface of the poured concrete. [Explanation of symbols]

[0038] 10 Piping structure of cooling pipes in vertical pipe cooling method 11 Cooling pipe line 11a One end 11b Other end 12 Vertical cooling pipe 12a Upper end 12b Bottom end 13 Upper connecting pipe 13a Connection end 14 Lower connecting pipe 14a Connection end 14b straight pipe 14c Joint hardware 14d Elbow pipe 15 Air vent section (air vent valve) 15a Valve body 15b T-joint 15c hose fitting 16a, 16b, 16c Gap tape 17a, 17b Solidification material (mortar) 18 Joint pipe 19 Sealing material (sealing tape) 20 Concrete Structures 21 Formwork 22 Concrete 22a Top surface 23 Deadline 24 Raw Water Tank 24a Pressure pump 25 Flexible sheath tube

Claims

1. A cooling pipe piping structure for a vertical pipe cooling method in which a cooling pipe path formed by a plurality of vertical cooling pipes arranged to extend vertically is arranged inside a formwork into which concrete is poured, and cooling water is pumped from one end of the arranged cooling pipe path, and the pumped water is allowed to flow out from the other end after heat exchange with the poured concrete, thereby suppressing a temperature rise of the poured concrete, the cooling piping path is formed by connecting upper and lower ends of the plurality of vertical cooling pipes using upper connecting pipes and lower connecting pipes, respectively; At least a portion of the upper connecting pipe is disposed above the top surface of the poured concrete, The outer diameter of the upper connecting pipe is smaller than the inner diameter of the vertical cooling pipe, and gap tape that fills the gap between the outer surface of the upper connecting pipe and the inner surface of the vertical cooling pipe is wrapped around the outer peripheral portion of the connection end of the upper connecting pipe, and the connection end wrapped with the gap tape is pushed into the inside of the upper end of the vertical cooling pipe, and a solidifying material is filled into the gap above the pushed-in gap tape and solidified, thereby forming a cooling pipe piping structure in a vertical pipe cooling method in which the upper connecting pipe is liquid-tightly connected to the upper end of the vertical cooling pipe.

2. A piping structure of cooling pipes in a vertical pipe cooling method, in which a cooling piping path formed by a plurality of vertical cooling pipes arranged in a vertical direction is arranged inside a formwork into which concrete is poured, and cooling water is pumped from one end of the arranged cooling piping path, and the pumped water is allowed to flow out from the other end after heat exchange with the poured concrete, thereby suppressing the temperature rise of the poured concrete, the cooling piping path is formed by connecting upper and lower ends of the plurality of vertical cooling pipes using upper connecting pipes and lower connecting pipes, respectively; At least a portion of the upper connecting pipe is disposed above the top surface of the poured concrete, The outer diameter of the upper connecting pipe is smaller than the inner diameter of the vertical cooling pipe, and a gap tape covering the gap between the outer surface of the upper connecting pipe and the inner surface of the vertical cooling pipe is wrapped around the outer peripheral portion of the connection end of the upper connecting pipe, and the connection end wrapped with the gap tape is pushed into a joint pipe, and the connection end pushed into the joint pipe is inserted inside the upper end of the vertical cooling pipe until the gap tape abuts against the upper end of the vertical cooling pipe, and a solidifying material is filled into the gap between the joint pipe and the vertical cooling pipe above the abutting gap tape and solidified, thereby forming a cooling pipe piping structure in a vertical pipe cooling method in which the upper connecting pipe is liquid-tightly connected to the upper end of the vertical cooling pipe.

3. A piping structure of a cooling pipe in a vertical pipe cooling method as described in claim 2, in which a sealing material is arranged in the gap between the inner surface of the joint pipe below the gap tape and the outer surface of the upper end of the vertical cooling pipe.

4. 3. The piping structure of the cooling pipe in the vertical pipe cooling method according to claim 1 or 2, wherein an air vent is provided in the upper connecting pipe in the portion located above the top surface of the poured concrete, so that air remaining as air pockets in the cooling piping can be removed.

5. 3. The cooling pipe piping structure for the vertical pipe cooling method according to claim 1, wherein the vertical cooling pipe is a box-open pipe such as a sheath pipe.

6. A piping structure of a cooling pipe in a vertical pipe cooling method as described in claim 5, wherein the box-out pipe is a spiral pipe formed by winding a strip of thin metal plate in a spiral shape.

7. 7. The cooling pipe piping structure for a vertical pipe cooling method according to claim 1, wherein the upper connecting pipe is made of a flexible piping material.

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