JP2018204328A - Steel pipe column member for filing concrete and construction method of concrete filled steel pipe member - Google Patents

Abstract

To provide a construction method of a concrete filled steel pipe member which keeps a concrete temperature equal to or more than a control predetermined temperature during and five days after filling concrete without arrangement of large-scale thermal insulation even when constructing the concrete filled steel pipe member in a cold season.SOLUTION: A steel pipe member 21 for filling concrete is a steel pipe member 21 provided with a column-beam joint portion 24 to which a steel beam 31 is connected, in which concrete 22 is filled, wherein an air duct 30 covering a steel pipe member 21 is arranged at a lower portion of the column-beam joint portion 24.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a steel pipe column material for filling concrete and a method for constructing a concrete filled steel tube column.

A concrete-filled steel pipe column (a so-called CFT column) may be used for the frame constituting the building structure. The concrete-filled steel pipe column includes a cylindrical steel pipe column material extending in the vertical direction, and concrete filled in the steel pipe column material. In such a concrete-filled steel pipe column, after the steel pipe column material is erected in a predetermined position, concrete is cast and filled inside the steel pipe column material. Construction of the concrete-filled steel pipe column is completed when the placed concrete hardens and develops a predetermined strength.
By the way, when performing concrete-filled steel pipe columns in winter or cold regions, if the outside air temperature is low, the temperature of the concrete placed inside the steel pipe column material will be low, and the concrete may not exhibit the prescribed strength . Therefore, for example, regarding the curing of concrete to be filled in steel pipe columns, it is required that “the temperature of the concrete does not fall below 2 ° C. during and after the placement for 5 days” (2002 Ministry of Land, Infrastructure, Transport and Tourism) Notification No. 464, paragraph 5, item 1).
For this reason, a plurality of proposals have been made to heat from the outside when concrete is cured after placing the concrete inside the steel pipe column.

For example, Patent Document 1 discloses a concrete curing device configured to send heated air into the air chamber, which is brought into close contact with the surface of the columnar concrete structure with a balloon having an air chamber. In this configuration, the balloon is formed so as to surround the upper portion of the columnar concrete structure and the side surface thereof.
In the concrete curing device as disclosed in Patent Document 1, the balloon covers up to the upper part of the columnar concrete structure. In the case where a steel beam column is integrally provided with a beam-column joint (joint portion) for joining a steel beam, the beam-column joint protrudes laterally from the steel tube column. For this reason, if the balloon is formed so as to cover the column beam joint portion in addition to the side surface and the upper surface of the steel pipe, the balloon becomes complicated and large. As a result, it takes time to install the balloon, which leads to a longer construction period. In addition, if the balloon is attached before the construction of the steel pipe column material, during the construction work of the steel pipe column material, the balloon air chamber is caused by interference with the surroundings, especially at the part of the column beam joint protruding from the steel pipe column material. May be damaged. If the air chamber is damaged, the air leaks when heated air is sent into the air chamber. For this reason, the balloon must be attached after constructing the steel pipe column material at the construction site, which also leads to a prolonged construction period.

Further, Patent Document 2 discloses a curing device configured to cover both the outer side and the upper end side of a concrete structure with a curing mat and supply warm air through an air passage formed in the curing mat.
Also in the curing device as disclosed in Patent Document 2, the steel pipe column material in which column beam joints for joining steel beams are integrally provided to cover the upper part of the concrete structure with the curing mat is cured. To cover with a mat, the curing mat becomes complicated and large. The curing mat has a double structure having a breathable sheet and a non-breathable sheet. If the curing mat is installed in a factory, the curing mat is damaged during transportation and hot air is supplied. In addition, warm air may leak from the air passage.

Patent Document 3 discloses a cold construction apparatus configured to cover the periphery of a steel pipe pillar with a heat generating sheet and circulate hot water through the heat generating sheet when curing the concrete placed inside the steel pipe pillar. Has been.
In a cold construction apparatus as disclosed in Patent Document 3, the heat generating sheet needs to have at least a double structure in order to circulate hot water. For this reason, when the exothermic sheet is attached to the steel pipe column material at the factory, especially in the case of the steel pipe column material provided with the column beam joint protruding, the exothermic sheet is columned during the construction work of the steel pipe column material. When hot water is circulated and damaged by interfering with the beam joint, the hot water may leak.

JP 2007-231563 A JP-A-9-221913 JP 2001-132230 A

  The problem to be solved by the present invention is to control the concrete temperature during concrete filling and for 5 days after filling without performing large-scale heat insulation curing even when concrete filled steel pipe columns are constructed in the cold season. It is to provide a steel tube pillar material for concrete filling that can be secured at a set temperature or higher, and a method for constructing a concrete filled steel tube pillar.

As a method for constructing a filled steel tube concrete column in the cold season, the present inventors do not directly heat the concrete filled in the steel tube column, but in a state where the column body of the steel tube column is wrapped with the wind tube, The present invention was achieved by focusing on the point that the concrete temperature during the filling of the concrete and the concrete temperature for 5 days after the filling can be maintained at the control set temperature (2 ° C.) or higher by blowing the warm air. Moreover, about the effect of this invention method, the external temperature and concrete temperature were measured and confirmed in the filling steel pipe concrete pillar under construction.
The present invention employs the following means in order to solve the above problems.
That is, the steel pipe column material for filling concrete of the present invention is a steel tube column material filled with concrete having a column beam joint, and a wind pipe covering the steel tube column material is provided below the column beam joint. It is characterized by being installed in a reduced size. In addition, in order to join with a steel beam, a beam joining member is attached to the column beam joining portion, and the beam joining member protrudes from the main body of the steel pipe column material.
According to such a configuration, the wind pipe is installed in the steel pipe column material at the stage before the steel pipe column material is built. It is possible to cure the concrete while keeping the steel pipe pillar material from touching directly. In addition, the wind pipe is installed below the column beam joint portion of the steel pipe column material, so that the column beam joint portion is not covered with the wind pipe. Therefore, it is possible to prevent the wind pipe from being damaged during the erection work and the beam joining work of the steel pipe column material in which the wind pipe is installed.

A method for constructing a concrete-filled steel pipe column according to the present invention is a method for constructing a concrete-filled steel pipe column, the step of building a steel pipe column material provided with a wind pipe, and covering a part of the steel pipe column material with the wind pipe. And then filling the steel pipe column with concrete.
According to such a configuration, when curing the concrete filled in the steel pipe column material, the wind pipe covering a part of the steel pipe column material suppresses the outside air from directly touching the steel pipe column material, thereby keeping the heat. .

In one aspect of the present invention, the method for constructing a concrete-filled steel pipe column according to the present invention is connected to the wind pipe before and / or after placing the concrete in the step of filling the steel pipe column material with the concrete. Hot air is blown from the generated hot air generator.
According to such a configuration, by sending warm air from the warm air generator to the wind pipe, the concrete filled in the steel pipe column material can be heated and the concrete can be cured under better temperature conditions.

  According to the present invention, even when a concrete-filled steel pipe column is constructed in the cold season, the concrete temperature during concrete filling and for 5 days after filling is equal to or higher than the control set temperature without performing large-scale heat insulation curing. It can be secured.

It is a front view which shows the structure of a part of the housing of the building structure which should be constructed in this embodiment. It is a perspective view which shows the steel pipe pillar material which comprises the pillar of the housing of FIG. It is a flowchart which shows the flow of the construction method of the concrete filling steel pipe pillar in this embodiment. It is a figure which shows the state which builds the steel pipe pillar material provided with the wind pipe in the predetermined position. It is a figure which shows the state which joined the steel beam to the steel pipe pillar material built in the predetermined position. It is a figure which shows the state which extended the wind pipe with which the steel pipe column material was equipped below, and preheated the steel pipe column material. It is a figure which shows the state which is heating the steel pipe column material after placement of concrete. It is a graph which shows the measurement result of the temperature outside the steel pipe pillar material when the hot air supply is continued after the concrete placement is completed. It is a graph which shows the measurement result of the temperature of the concrete in a steel pipe pillar material when hot air supply is continued after completion of concrete placement. It is a graph which shows the measurement result of the temperature outside the steel pipe pillar material after stopping hot air supply.

The present invention provides a steel tube column material for concrete filling (FIGS. 2 and 4) in which a wind tube covering the steel tube column material is installed on the lower side of the column beam joint portion before the steel tube column material is built. 5) and with the wind pipe covering the column main body constituting the steel pipe column material, before the concrete is placed in the steel pipe column and / or after the placement, warm air is blown into the wind pipe. It is a construction method of a concrete-filled steel pipe column that is characterized (FIGS. 6 and 7).
Hereinafter, with reference to an accompanying drawing, the form for carrying out the construction method of the steel pipe pillar material for concrete filling by this invention and the concrete filling steel pipe pillar is explained based on a drawing.
FIG. 1 shows a partial configuration of a building structure to be constructed in the present embodiment. The perspective view which shows the steel pipe pillar material which comprises the pillar of the housing of FIG. 1 is shown in FIG.
As shown in FIG. 1, a building structure 1 to be constructed includes a column 2 extending in the vertical direction, and beams 3 installed on columns 2 adjacent to each other on each floor of the building structure. Yes.

The column 2 is formed by a concrete-filled steel tube column 20 having a tubular steel tube column material 21 continuous in the vertical direction and a concrete 22 filled in the steel tube column material 21. As shown in FIG. 2, the steel pipe column member 21 has a length extending in a vertical direction, for example, over a plurality of layers. In the steel pipe column 21, column beam joints 24 are formed at intervals in the vertical direction. The column beam joint portion 24 has a beam joint member 25 that protrudes in the horizontal direction from the outer peripheral surface of the steel pipe column member 21 toward each beam 3. Each beam joining member 25 has the same cross-sectional shape as a steel beam 31 described later, and integrally includes an upper flange 25a, a lower flange 25b, and a web 25c that connects the upper flange 25a and the lower flange 25b. doing. Further, on the outer peripheral surface of the steel pipe column member 21, it is continuous with the circumferential direction of the steel pipe column member 21 at the same height as the upper flange 25a and the lower flange 25b of the beam joining member 25 and protrudes outward in the horizontal direction. Ribs 26 are formed.
In this embodiment, one steel pipe column member 21 has column beam joints 24 formed at two upper and lower portions. Thereby, as for the steel pipe column material 21, the cylindrical parts 21p are each formed in the part except the column beam junction part 24 of two upper and lower places, ie, the upper part of the steel pipe column material 21, an intermediate part, and the lower part.
As shown in FIG. 1, the beam 3 has a steel beam 31 integrally having an upper flange 31a, a lower flange 31b, and a web 31c that connects the upper flange 31a and the lower flange 31b. . Both ends of the steel beam 31 are joined to each beam joining member 25 by a joint plate 32 and a bolt 33. In addition, deck plates 27 and the like are laid on the beams 3 on each floor to form a floor on each floor.

Next, the construction method of the concrete filling steel pipe column 20 which comprises the above pillars 2 is demonstrated.
The flowchart which shows the flow of the construction method of the concrete filling steel pipe pillar in this embodiment is shown in FIG. FIG. 4 shows a state in which a steel pipe column member provided with a wind pipe is built in a predetermined position. Moreover, the state which joined the steel beam to the steel pipe pillar material built in the predetermined position is shown in FIG.
The steel pipe column 21 is manufactured in advance at a factory. As shown in FIG. 2, after the steel pipe column 21 is carried into the construction site, the retractable wind tube 30 is attached to the steel pipe column 21 at the construction site temporary storage site. The wind pipe 30 has a cylindrical shape having an inner diameter larger than the outer diameter of the cylindrical portion 21p of the steel pipe column 21 and is made of a flexible material, for example, a vinyl material. The wind pipes 30 are respectively provided below the beam-column joints 24 provided at two upper and lower portions. Each wind pipe 30 is locked by a clamp fitting 36 to a lower flange 25b of a beam joining member 25 of a beam-to-column joint 24 of each floor provided at the upper end 30t of the steel pipe column 21. The clamp fittings 36 are arranged at a plurality of locations spaced apart in the circumferential direction on the upper end 30 t of the wind tube 30. As a result, the upper end 30t of the wind pipe 30 is not in close contact with the steel pipe column 21 and the steel pipe column 21 except for the portion fixed to the column beam joint 24 by the clamp fitting 36. There is a gap between them and is open upward. Each wind pipe 30 has a length that can cover up to the lower end of the tubular portion 21p of the steel pipe column 21.
After the steel pipe pillar 21 provided with such a wind pipe 30 is carried from the factory to the construction site by a truck or the like, the wind pipe 30 is shrunk upward, and the steel pipe pillar 21 is formed by the rubber band 34 or the like. Temporarily fixed to the cylindrical portion 21p. Thus, it is not necessary to attach the wind pipe 30 after the steel pipe column is installed by attaching the wind pipe 30 to the steel pipe column material 21 at the temporary construction site. Further, by attaching the wind tube 30 to the lower side of the beam-column joint portion 24, the wind tube 30 is prevented from interfering with the beam-column joint portion 24 projecting laterally from the steel tube column material 21 during the erection operation or the like. . Furthermore, the wind tube 30 is contracted above the cylindrical portion 21p and collected, so that the wind tube 30 is prevented from being damaged due to interference with other articles during the construction of the steel tube column.

As shown in FIGS. 3 and 4, after temporarily fixing the wind pipe 30, the steel pipe column 21 to which the wind pipe 30 is attached is suspended by a wire W of a lifting means such as a crane, and filled with concrete. The steel pipe column 20 is built at a predetermined position to be constructed (step S1). The built-in steel pipe pillar material 21 is joined to the steel pipe pillar material 21 on the lower floor that has already been constructed by welding or the like.
As shown in FIG. 5, after the steel pipe column member 21 is installed, the steel beam 31 is joined to each beam joining member 25 of the column beam joining portion 24 of each floor provided in the steel tube pillar material 21. Further, a deck plate 27 is laid on the beam 3 on each floor.

FIG. 6 shows a state in which the wind pipe provided for the steel pipe column material is extended downward to preheat the steel pipe column material.
Thereafter, the steel pipe column material 21 is preheated prior to placing and filling the concrete 22 into the steel tube column material 21. For this reason, as shown in FIG. 6, the rubber band 34 of each wind tube 30 is cut outside the steel tube column 21 and the temporary fixing of the lower end portion 30 b of the wind tube 30 is released. At this time, by using high branch scissors or the like for cutting the rubber band 34, the rubber band 34 can be cut from the deck plate 27 on each floor without using a scaffold. Next, the lower end portion 30b of each wind tube 30 is pulled down, the wind tube 30 is extended, and the tubular portion 21p on the lower side of each column beam joint portion 24 in the steel tube column 21 is covered with the wind tube 30 (step S2). .
Furthermore, in each floor below each beam-column joint portion 24 of the steel pipe column member 21, hot air generators 40A and 40B are installed on the deck plate 27, and the lower ends of the wind pipes 30 are provided via the cylindrical ducts 41A and 41B. Connect to the unit 30b.
Further, a hot air generator 40C such as a jet heater type oil furnace is installed on the deck plate 27 above the column beam joint 24 on the upper side of the steel pipe column 21. A tubular duct 41 </ b> C is connected to the hot air generator 40 </ b> C, and the tip of the duct 41 </ b> C is inserted into the steel tube column 21 from the upper end 21 t of the steel tube column 21. At this time, the enclosure 45 which consists of a vinyl sheet etc. is provided so that the upper end part 21t of the steel pipe pillar material 21 may be covered.

Next, warm air is generated by the warm air generators 40A to 40C. The warm air generated by the warm air generators 40A and 40B is sent to the inside of each wind tube 30 via the ducts 41A and 41B (step S3). Then, a warm air layer is formed between the wind pipe 30 and the outer peripheral surface of the steel pipe column member 21, and thereby the tubular portion 21p of the steel pipe column member 21 is preheated from the outside. Furthermore, the warm air sent into the wind tube 30 is ejected upward from the gap between the upper end portion 30t of the wind tube 30 and the steel tube column 21. The column beam joint 24 of the steel pipe column 21 that is not covered by the wind tube 30 is preheated by the hot air that is blown out.
The hot air generated by the hot air generator 40C is sent to the inside of the steel pipe column 21 through the duct 41C, and preheats the steel pipe column 21 from the inside.

FIG. 7 shows a state in which the steel pipe column material is heated after the concrete is placed.
After preheating for a predetermined time, concrete 22 is placed in the steel pipe column 21 from the upper end 21t of the steel pipe column 21 via a tremy pipe (not shown) (step S4). At this time, as shown in FIG. 7, the front end portion of the duct 41C that has been inserted into the upper end portion 21t of the steel pipe column 21 for preheating is pulled upward, and the inside of the enclosure 45 from the duct 41C of the hot air generator 40C. To blow out warm air.
While the concrete 22 is being placed on the steel pipe column 21 and after the completion of the placement on the steel pipe column 21, the temperature in the wind pipe 30 by the hot air generators 40A and 40B is maintained for a predetermined period, for example, 5 days. The supply of hot air and the supply of hot air into the enclosure 45 by the hot air generator 40C are continued.
In the wind pipe 30 arrange | positioned under each column beam junction part 24, the cylindrical part 21p of the steel pipe column material 21 is heated by sending warm air from warm air generator 40A, 40B. Furthermore, the column beam joint portion 24 of the steel pipe column member 21 is heated by the warm air blown upward from the upper end portion 30 t of the wind tube 30. Moreover, in the enclosure 45, the upper end part 21t of the steel pipe column material 21 is heated by sending warm air from the warm air generator 40C. In this way, the entire steel pipe column 21 is heated by the hot air, and the hardening reaction of the concrete 22 is promoted.

After the concrete 22 is placed in the steel pipe column 21, the hot air generators 40 </ b> A, 40 </ b> B, 40 </ b> C enter the wind pipe 30 and the enclosure 45 until a predetermined period, for example, 5 days elapses. The concrete 22 is cured while continuing the supply of hot air (step S5).
Here, the measurement result of the temperature outside the steel pipe column 21 when the hot air supply is continued after the concrete 22 is placed as described above is shown in FIG. Moreover, the measurement result of the temperature of the concrete 22 in the steel pipe column 21 when the hot air supply is continued after the concrete 22 is placed is shown in FIG.
As shown in FIG. 8, by supplying warm air into the wind tube 30 and the enclosure 45, even when the air temperature is below freezing point, the warm air ejection portion P1 from the upper end 30t of the wind tube 30 (Refer to FIG. 7) and the temperature of the upper end portion of the column beam joint 24 above the upper end portion 30t of the wind pipe 30 (a portion directly below the deck plate 27 on the upper floor) P2 (see FIG. 7) is approximately 10 ° C. The above is maintained. Further, as shown in FIG. 9, by supplying warm air into the wind pipe 30 and the enclosure 45, the temperature of the concrete 22 in the steel pipe column 21 is 10 ° C. even when the air temperature is below freezing point. The above is maintained.

After the concrete 22 has been placed in the steel pipe column 21, when a predetermined period, for example, five days has elapsed, the hot air generators 40 </ b> A, 40 </ b> B, 40 </ b> C enter the wind pipe 30 and the enclosure 45. Stop supplying hot air. And the wind pipe 30 and the enclosure 45 are removed (process S6). Here, since the wind tube 30 is formed of a vinyl-based material, it can be easily removed by cutting with a cutter or the like.
The measurement result of the temperature outside the steel pipe column 21 after the hot air supply is stopped as described above is shown in FIG.
As shown in FIG. 10, after the hot air supply from the hot air generators 40A, 40B, and 40C to the wind tube 30 and the enclosure 45 is stopped, about two days have passed (reference numeral in FIG. 10). At T), the temperature outside the steel pipe column 21 decreased to 2 ° C. or lower, which is the management set temperature. However, for about one day after the supply of hot air is stopped, the temperature outside the steel pipe column 21 is maintained at the control set temperature of 2 ° C. or higher. It is also possible to make the period of continuing to be shorter than 5 days after filling the concrete 22.

According to the steel pipe column material 21 for filling concrete as described above, the steel tube column material 21 is provided with the column beam joint portion 24 to which the steel beam 31 is joined and is filled with the concrete 22. A wind pipe 30 covering the steel pipe column 21 is installed below 24.
According to such a configuration, the wind tube 30 is installed in the stage before the steel pipe column member 21 is built, and after the steel tube column member 21 is filled with the concrete 22, The concrete 22 can be cured while keeping the heat by keeping the outside air from directly touching the tubular portion 21p of the steel pipe column 21. In addition, the wind tube 30 is not covered with the wind tube 30 by shrinking and fixing the wind tube 30 below the column beam joint portion 24 of the steel pipe column member 21. Therefore, it is possible to prevent the wind pipe 30 from being damaged during the erection work and the beam joining work of the steel pipe column member 21 in which the wind pipe 30 is installed. In addition, by attaching the wind pipe 30 to the steel pipe pillar material 21 at the temporary construction site, it is not necessary to attach the wind pipe 30 after the steel pipe pillar has been built, and the lengthening of the construction period can be suppressed.

Moreover, according to the construction method of the concrete-filled steel pipe column 20 as described above, after the step of building the steel pipe column material 21 provided with the wind pipe 30 and covering a part of the steel pipe column material 21 with the wind pipe 30, Filling the steel pipe column 21 with concrete 22.
According to such a configuration, when curing the concrete 22 filled in the steel pipe column 21, the outside air is transferred to the tubular portion 21 p of the steel pipe column 21 by the wind pipe 30 that covers a part of the steel pipe column 21. Insulation is suppressed by touching directly.

Further, in the step of filling the steel pipe column material 21 with the concrete 22, hot air is blown from the hot air generators 40 </ b> A and 40 </ b> B connected to the wind pipe 30 before and / or after the concrete 22 is placed.
According to such a configuration, the hot air is sent from the hot air generators 40A and 40B to the wind pipe 30, thereby heating the concrete 22 filled in the steel pipe column 21 and curing the concrete 22 under better temperature conditions. can do.
In this way, even when the concrete-filled steel pipe column 20 is constructed in the cold season, the temperature of the concrete 22 during the filling of the concrete 22 and for 5 days after filling is managed and set without performing a large-scale heat insulation curing. It becomes possible to ensure more than the temperature.

In addition, each wind tube 30 is fixed at a plurality of locations at intervals in the circumferential direction by clamp fittings 36 at the upper end 30t to the lower flange 25b of the beam connecting member 25 of the column beam connecting portion 24.
As a result, the upper end 30t of the wind pipe 30 is not in close contact with the steel pipe column 21 and the steel pipe column 21 except for the portion fixed to the column beam joint 24 by the clamp fitting 36. There is a gap between them and is open upward. Therefore, when warm air is sent into the wind tube 30, the warm air is blown upward from the gap between the upper end portion 30 t of the wind tube 30 and the steel tube column 21, and the steel tube column 21 that is not covered by the wind tube 30. The part of the column beam joint 24 can be heated. Thereby, even if the wind pipe 30 is provided only in a part excluding the column beam joint portion 24 with respect to the steel pipe column member 21, the entire steel pipe column member 21 can be heated. Therefore, even if the deck plate 27 is laid before the concrete 22 is placed, the steel pipe column 21 can be heated. Furthermore, by laying the deck plate 27 prior to the placement of the concrete 22, various operations can be performed on the deck plate 27 on each floor without assembling a scaffold, and the work efficiency can be improved. it can.
In addition, when the steel pipe column 21 is carried into the construction site temporary storage place, when the wind pipe 30 is attached, the wind pipe 30 is shrunk upward and bundled so that the tubular portion of the steel pipe pillar 21 is covered with a rubber band 34 or the like. Temporarily fixed to 21p. Thereby, it can suppress that the wind pipe 30 breaks during the beam joining operation | work in the column beam joint part 24 periphery which protruded from the steel pipe column material 21 to the side.

(Modification of the embodiment)
In addition, the construction method of the steel pipe pillar material for concrete filling of this invention and a concrete filling steel pipe pillar is not limited to the above-mentioned embodiment described with reference to drawings, Various in the technical scope. Variations are possible.
For example, in the above embodiment, the clamp fitting 36 is used to fix the upper end 30t of the wind tube 30, but any specific configuration may be used.
In the above embodiment, the wind tube 30 is fixed to the lower flange 25b located at the lower end of the beam-column joint 24. However, the temporarily fixed position of the wind tube 30 is below the beam-column joint 24. If so, for example, the intermediate position in the vertical direction of the cylindrical portion 21p may be used.
Moreover, in the said embodiment, although warm air is supplied with the warm air generators 40A-40C, it is not essential to supply warm air continuously, and it is intermittent as appropriate according to the outside air temperature or the like. You may make it carry out.
Moreover, in the said embodiment, after carrying a steel pipe pillar material in a construction site temporary storage place, a wind pipe is attached to the lower side of the column beam joint part of a steel pipe pillar material, and the steel pipe pillar material in which the wind pipe was installed is built. However, at the factory, a shortened wind pipe may be attached to the steel pipe pillar material, and the steel pipe pillar material on which the wind pipe is installed may be carried into the construction site by a truck or the like.
In addition to this, the configuration described in the above embodiment can be selected or changed to another configuration as appropriate without departing from the gist of the present invention.

21 Steel pipe column material 30 Wind pipe 22 Concrete 31 Steel beam 24 Column beam joint 40A, 40B Hot air generator

Claims (3)

A steel pipe column material filled with concrete having a beam-column joint,
A steel pipe column material for filling concrete, characterized in that a wind pipe covering the steel pipe column material is installed below the column beam joint. A method for constructing a concrete-filled steel pipe column,
Building a steel pipe column with a wind pipe,
A method of constructing a concrete-filled steel pipe column, comprising: covering a part of the steel pipe column material with the wind pipe, and then filling the steel pipe column material with concrete. 3. The step of filling the steel pipe column with the concrete includes blowing hot air from a hot air generator connected to the wind pipe before and / or after placing the concrete. A method for constructing a concrete-filled steel pipe column as described in 1.

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