JP2860727B2 - Building construction method to introduce prestress into filled concrete steel tubular column - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction method for introducing a prestress into a filled concrete steel pipe column when building a multi-layered building using the filled concrete steel pipe column.

[0002]

2. Description of the Related Art Conventional methods of joining a filled concrete steel pipe column and an H-shaped steel beam are roughly classified into an inner diaphragm type and an outer diaphragm type. (1) In the inner diaphragm type steel pipe column 1, for example,
As shown in FIGS. 11 and 12, a long and thin steel plate is bent to form semi-cylindrical bodies 1A and 1B, and the steel plate is cut into a fan shape to form inner diaphragm pieces 2A and 2B. The radius of the arc of the outer circumference of the sector of 2A, 2B is substantially matched with the radius of the arc of the inner circumference of the semi-cylindrical bodies 1A, 1B, and the H-section steel on the inner peripheral surface of the pair of semi-cylindrical bodies 1A, 1B The inner diaphragm pieces 2A, 2B are arranged at respective positions corresponding to the mounting positions of the flanges 4a of the beam 4, and the outer peripheral portions of the inner diaphragm pieces 2A, 2B are welded to the inner peripheral surfaces of the semi-cylindrical bodies 1A, 1B. , A pair of semi-cylindrical bodies 1A, 1B in the longitudinal direction edge 1A1, 1B1 together, these edges 1A1, 1B
1 are welded to each other to form a steel tube column 1 and an inner diaphragm is formed by a pair of inner diaphragm pieces 2A and 2B, and a gusset plate 3 is provided at a web mounting position of a steel beam 4 on an outer peripheral portion of the steel tube column 1. Are welded. This steel pipe column 1 is carried into a construction site and built at a predetermined position.
The web 4b of the steel beam 4 is fixed to the gusset 3 of the steel tube column 1, and then the flange 4a of the steel beam 4 is welded to the outer portion of the steel tube column 1 corresponding to the inner diaphragm 2. After the attachment of the steel beam 4 to the steel pipe column 1 is completed, concrete 5 is filled in the steel pipe column 1 to form a filled concrete steel pipe column. (2) As shown in FIG. 13 and FIG. 14, for example, as shown in FIG. 13 and FIG. 14, a steel pipe column 6 is formed by cutting a ready-made steel pipe into a predetermined length, and a steel plate is cut into an annular shape to form an outer pipe. Diaphragms 7A, 7B are formed, a plurality of annular outer diaphragms 7A, 7B are fitted to the steel pipe column 6, and the outer diaphragms 7A, 7B are positioned at positions corresponding to the mounting positions of the flanges 4a of the steel beam 4 of the steel pipe column 6. Let each outer diaphragm 7
In some cases, the inner peripheral portions of A and 7B are welded to the outer peripheral portion of the steel pipe column 6, and the gusset plate 3 is welded to the outer peripheral portion of the columnar body 6 at the web mounting position of the steel beam 4. The steel pipe column 6 is carried into a construction site and built at a predetermined position. Then, the web 4b of the steel beam 4 is fixed to the gusset plate 3 of the steel pipe column 6, and then the outer diaphragms 7A and 7B of the steel pipe column 6 are formed. The flange portion 4a of the steel beam 4 is welded to the outer portion. After the attachment of the steel beam 4 to the steel pipe column 6 is completed, the steel pipe column 6 is filled with concrete to form a filled concrete steel pipe column.

[0003]

The inner diaphragm type (1) has a good effect on the balance between the bending moment of the steel beam 4 and the steel pipe column 1, and the vertical force acting on the steel beam 4. Is effectively transmitted as an axial force to the filled concrete in the steel pipe column 1, and is structurally rational. However, in order to form a diaphragm inside the steel pipe column 1 corresponding to the beam mounting position, the inner diaphragm piece 2
A and 2B are welded to the inner peripheral surfaces of the semi-cylindrical bodies 1A and 1B, and then the pair of semi-cylindrical bodies 1A and 1B are joined along the longitudinal edges 1A1 and 1B1, and these edges are joined together. 1A1, 1
B1 must be welded together to form a steel tube column 1,
This is a factor of cost increase. The outer diaphragm type (2) is intended to use a relatively inexpensive off-the-shelf steel pipe, and the bending moment between the steel beam 4 and the steel pipe column 6 is balanced with the inner diaphragm type. Similarly, the transmission of the vertical force acting on the steel beam 4 to the filled concrete in the steel tube column 6 is insufficient. In a small building, the vertical force acting on the steel beam is transmitted to the filled concrete by the adhesive force between the inner surface of the steel column and the filled concrete, and the shear acting on the shear connector provided at the beam mounting position in the steel column. We go by force. However, it is difficult work to fix the shear connector to the beam mounting position in the steel pipe column by welding. A generalized outer diaphragm design method applicable to large-scale buildings has not yet been proposed. Conventional (1) and (2)
There is no attempt to increase the adhesion between the inner surface of the steel pipe column and the concrete filled in the steel pipe column, and prestress is introduced into the filled concrete steel pipe column to reduce the axial load burden ratio of the filled concrete. No attempt was made to increase it. However, the structural design using filled concrete steel pipe columns has the advantage that the column strength can be rationally increased by applying the axial force to the filled concrete, so the demand for inventions that can fully demonstrate the advantages is extremely high. . The problem to be solved by the present invention is to provide a construction method which does not have the drawbacks of the methods (1) and (2), in other words, to increase the adhesive force between the steel pipe column and the filled concrete. Another object of the present invention is to provide a building method for introducing prestress into a filled concrete steel pipe column capable of increasing an axial load burden ratio of the filled concrete.

[0004]

The present invention adopts the following constitution in order to solve the above-mentioned problems. In the configuration of the present invention, at the column forming position of the lower skeleton, a steel pipe column having a closing plate fixed to the top is built, concrete is filled inside each steel tube column, and a pressure-resistant lid is attached on the closing plate of the steel column. A closed space is formed on the filled concrete, a pressurized fluid is supplied into the closed space, and the upper surface of the uncured concrete is pressurized, and a tensile force is applied to the steel pipe column. Filled concrete steel pipe column characterized by hardening concrete underneath, removing tensile force after hardening of concrete, removing pressure-resistant lid, filling concrete between upper surface of hardened concrete and lower surface of closing plate There is an architectural construction method that introduces prestress into the building. The closing plate is fixed to the top of the one-piece steel pipe column, and the one-piece steel pipe column is formed by cutting a ready-made steel pipe into a length of 2 to 4 stories.
Off-the-shelf steel pipes that can be used include, for example, hot-finished seamless steel pipes, forged steel pipes, and ERW steel pipes. The reason for limiting the length of one section of steel pipe column to the length of two to four floors is to make the steel pipe column easily transportable and easily liftable, and to provide a blocking member serving as an axial force transmitting member. This is to prevent an excessive shear force from acting on the plate. In a preferred embodiment, the prestress is introduced into the steel pipe column by building the steel pipe column at the column forming position of the lower frame, temporarily mounting a steel beam to the beam mounting member on each floor, and applying a certain load to the steel pipe column. After the introduction of prestress is completed, the steel beams on each floor will be permanently attached to the steel pipe columns.

[0005] A closing plate is fixed inside the steel pipe column slightly lowered from the upper end, a housing portion is formed on the upper side of the closing plate, and at least the lower portion of the pressure-resistant lid is housed in this housing portion, and the pressure-resistant lid is housed. It can be detachably fixed to the top of a steel pipe column. The fluid supply pipe is connected to the fluid introduction hole of the pressure-resistant lid, and the fluid supply pipe is connected to the pressure fluid supply source. As the pressure fluid, for example, high-pressure water, high-pressure oil, or the like is used. When using high-pressure oil, make sure that the oil does not directly contact the filled concrete.
An oil bag made of an elastic body or the like is provided above the filled concrete, and the filled concrete is pressurized through the elastic layer of the oil bag. The position at which the closing plate acting as the axial force transmitting member is fixed is determined by the welding heat when welding the lower end of the upper steel tube column to the upper end surface of the steel tube column, and the welding portion between the steel tube column and the closing plate and the inside of the steel tube column. In a range that does not adversely affect the concrete that has been filled into the steel pipe, and that does not impair the workability of the joining work by welding the steel pipe column and the closing plate. In a preferred embodiment, a steel plate with an opening for filling concrete is used as the closing plate. The part around the joint plate is fixed to the inner peripheral part of the steel pipe column by welding. However, the closing plate is not limited to this. Any shape member may be used as long as it can transmit the axial force acting on the steel pipe column to the filled concrete. It is easy to manufacture and easy to join by welding to the inner peripheral part of the steel pipe column, there is no obstacle to filling concrete in the steel pipe column, and between the upper surface of hardened concrete and the lower surface of the closing plate Select a configuration that can be filled with concrete to maintain the state of prestressing into the filled concrete steel column. The beam mounting members are fixed to the two or four beam mounting positions of the steel pipe column. For example, a gusset plate, a pair of outer diaphragms, or the like is used as the beam attachment member. When attaching a beam mounting member to a section of steel pipe column,
The two to four beam mounting positions should not be near the upper end or lower end of the steel tube column. That is, the beam mounting position is set at the middle part of the steel tube column of one section. Then, the joining operation by welding the closing plate to the steel pipe column, the joining operation of the steel pipe column, the filling work of concrete, and the like are facilitated.

[0006]

According to the construction method of the present invention, the upper surface of uncured concrete is pressed by the pressure of fluid to apply a tensile force to the steel pipe column, and the concrete is hardened in the presence of the tensile force. Since the adhesive force between the outer peripheral surface of the filled concrete and the inner peripheral surface of the steel pipe column can be increased, and concrete is filled between the upper surface of the hardened filled concrete and the lower surface of the closing plate, the filled concrete steel column is The prestress introduced into the steel pipe column can be maintained, and the burden ratio of the axial force of the concrete filled in the steel pipe column can be increased.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1 and FIG. 2, the steel pipe column 11 is manufactured by cutting a ready-made steel pipe having a circular cross section into a length of three stories of a building for building. The steel blocking plate 12 constituting the axial force transmitting member for transmitting the axial force temporarily borne by the steel pipe column 11 to the filled concrete 16 in the steel pipe column 11 is:
For example, we manufacture subjected to a cutting process or the like on the steel plate. The shape of the outer peripheral portion 12 a is made to substantially match the shape of the inner peripheral portion 11 a of the steel pipe column 11. Then, a circular opening 12b is formed at the center thereof.
To form The opening 12b has such a size that a flexible tube for filling concrete, such as a tremie tube, can be inserted. The thickness of the closing plate 12 is determined according to the shearing force acting thereon. The annular bodies 13A and 13B constituting the outer diaphragm are shown in FIG.
As shown in FIG. 2, the width of the annular portion is larger than the thickness, and the diameter of the opening 13 a is slightly larger than the outer diameter of the steel pipe column 11. To manufacture. In addition, a linear flange mounting portion 13c is formed in a portion corresponding to the mounting position of the steel beam 20 on the peripheral edge portion 13b of the annular bodies 13A and 13B. The gusset plate 14 serving as an attachment member for the web 20b of the steel beam 20 has, for example, a vertical dimension of the steel pipe column 1.
1 is formed so as to substantially match the dimension between the inner surfaces of the flanges 20a of the beam steel frame 20 to be attached to 1. As shown in FIG. 5 to FIG. 7, the pressure-resistant plate 17 is formed so that a lower portion 17a thereof can be fitted into the accommodation portion at the upper end of the steel pipe column 11, and a plurality of ribs 17b are provided on the upper side. A fluid introduction hole 17c is formed substantially at the center, and one end of the fluid supply pipe 18 is connected to the fluid introduction hole 1c.
Fixed fitted to 7c, connecting the other end of the fluid supply tube 18 to the pressure fluid source (not shown). As shown in FIGS. 5 and 6, the pressure plate 17 is detachably fixed to the steel pipe column 11 by passing a bolt b through a bolt through hole formed in the peripheral wall thereof and a bolt through hole formed in the upper end portion of the steel tube column 11. Alternatively, as shown in FIG. 7, a plurality of mounting pieces 17d are formed integrally with the upper ribs, and a plurality of gusset plates 11b are welded around the upper end of the steel pipe column 11, and each mounting is performed. Bolts b are passed through bolt through holes drilled in piece 17d and bolt through holes drilled in each gusset plate 11b so that they can be detachably fixed to steel pipe column 11. In addition, the dimension between the centers of the beam mounting positions in the vertical direction of the building is defined as floor height L.

A closing plate 12 is fitted on the upper portion of the steel pipe column 11, and an outer peripheral portion 12a of the closing plate 12 is joined to an inner peripheral portion 11a of the steel pipe column 11 by welding w. Upper end surface of steel pipe column 11 and closing plate 1
When the lower end 11A of the upper steel pipe pillar 11 is joined to the upper end face of the steel pipe pillar 11 by welding, the distance between the upper end face of the steel pipe pillar 11 and the filler in the steel pipe pillar 11 is determined. In consideration of the adverse effect on concrete, etc., the dimensions are set within a range that does not impair the workability of the welding operation. The annular members 13A and 13B for three floors (six pieces) are fitted to the steel pipe column 11, and the annular members 13B and 13B are located at the floor height L × 2/3 from the lower end of the steel pipe column 11.
Position the gusset plate 14 and the annular body 13A,
The inner edge of the gusset plate 14 is welded to the outer peripheral portion of the steel pipe column 11, and a pair of annular bodies 13A and 13B are welded to the upper and lower surfaces of the steel pipe column 11 and the gusset plate 14 with the gusset plate 14 interposed therebetween. L + L from the lower end of steel tube column 11
The annular body 13B and the gusset plate 14 are located at × 2/3 positions.
And the annular body 13A is positioned, and the inner edge of the gusset plate 14 is welded to the outer peripheral portion of the steel pipe column 11, and a pair of annular bodies 13A and 13B are placed on the upper and lower surfaces of the steel pipe column 11 and the gusset plate 14 with the gusset plate 14 interposed therebetween. Weld.
The annular body 13B, the gusset plate 14 and the annular body 13A are located at a position of 2L + L × 2/3 from the lower end of the steel pipe column 11, and the inner edges of the gusset plate 14 are welded to the outer periphery of the steel pipe column 11 to form a pair of annular bodies. 13A and 13B are welded to the upper and lower surfaces of the steel tube column 11 and the gusset plate 14 with the gusset plate 14 interposed therebetween. That is, a steel pipe column 11 having a length of L × １ ／ is provided above a beam mounting member composed of a pair of annular bodies 13A and 13B and a gusset plate 13 at the top.
The filled concrete steel column 10
Steel column 11 is formed.

At a plurality of pillar-building positions of a lower frame such as a foundation,
A short steel column (for example, a steel pipe column) 15 protruding by a length substantially equal to the floor height L × １ ／ is fixed, and these steel columns are fixed.
The steel pipe columns 11 are erected on the respective steel pipe columns 15 , and the lower end portions of the steel pipe columns 11 are welded to the upper end portions of the steel column 15. Then, the H-shaped steel beam 20 is attached to the end face of the gusset plate 14.
The end faces of the webs 20b are opposed to each other, the attachment plate is applied to the webs 20b, and the webs are temporarily mounted with bolts and nuts (or the gusset plate and the web of the steel beam are overlapped and temporarily mounted with bolts and nuts). As shown in FIGS. 5 and 6, the inside of each steel pipe column 11 is filled with concrete. Thereafter, the pressure-resistant plate 17 is fitted into the accommodating portion at the upper end of the steel pipe column 11, and the pressure-resistant plate 17 is detachably fixed to the top of the steel pipe column 11 using bolts b and nuts. Then, a pressurized fluid is supplied from a pressure fluid supply source (not shown) to the upper side of the filled concrete through the fluid supply pipe 18 and the fluid introduction hole 17c, and the upper surface 16a of the concrete is pressed to bring the state shown in FIG. In the state shown in FIG. 6, Ts = Ac × Flc ÷ A, where Ts: tensile stress of steel pipe column, Flc: fluid pressure, As: cross-sectional area of steel pipe column, Ac: cross-sectional area of filled concrete Ac.
The relationship of s holds. Therefore, the pressure Flc of the fluid applied to the upper surface 16a of the filled concrete 16 is set so that, for example, the tensile stress Ts of the steel pipe column is approximately one third of the yield tensile stress of the steel constituting the steel pipe column 11. Then
(A) When the REIT 19 does not harden in the radial direction of the steel pipe column 11 itself, even if external force is applied, the introduced steel pipe column 11
The pre-stress state does not change. In this state, for example, it is preferable that at least a prestress of about one-fourth of the yield tensile stress of the steel constituting the steel tube column 11 remains in the steel tube column 11.

After the concrete 16 has hardened, the pressurization by the pressurized fluid is stopped. To further explain the state where the tensile force of the steel pipe column 11 has been removed, the filled concrete 16 itself hardens while being compressed under pressure, so that even if the tensile force is removed, its volume hardly shrinks. However, the steel pipe column 11 itself expanded in the radial direction under pressure, but when the pressure is removed, the steel pipe column 11 itself contracts. Then, since the hardened concrete 16 is pressed by the contraction force of the steel pipe column 11 itself, the adhesive force between the steel pipe column 11 and the filled concrete 16 increases. FIG. 8 conceptually shows the relationship between this adhesive force and the height of the steel tube column of one section. As can be seen from FIG. 8, under pressure, the pressure of the fluid and the weight of the uncured filled concrete act on the lower part of the steel pipe column 11, so that the adhesive force increases at the lower part of the steel pipe column 11. On the other hand, since the pressure of the fluid is mainly applied to the upper part of the steel pipe column 11 and the weight of the uncured filled concrete hardly acts, the adhesive force is small at the upper part of the steel pipe column 11. There are approximately constant adhesion Af ₁ is a steel and concrete constituting the steel column 11. Af ₂ in FIG. 8 is a increment of adhesion due to the weight of the filling concrete uncured, Af ₃ is the amount of increase in the adhesive force due to pressure. Therefore, even if the pressurization of the upper surface 16a of the concrete is stopped and the tensile force of the steel tube column 11 is removed, the adhesive force Af = Af ₁ + Af ₂ + Af ₃ exists between the steel tube column 11 and the filled concrete. Steel pipe column 1
Most of the tensile force applied to 1 remains unless external force is applied. Therefore, after the pressure-resistant lid 17 is removed, the gap between the upper surface 16a of the hardened concrete and the lower surface 17c of the closing plate 17 is filled with the concrete 19 as shown in FIG. Let it. When this concrete 19 hardens, even if external force is applied,
The prestressed state of the introduced steel pipe column 11 does not change. In this state, for example, it is preferable that at least a prestress of about one-fourth of the yield tensile stress of the steel constituting the steel tube column 11 remains in the steel tube column 11.

After the concrete 19 has hardened, the flange 20a of the steel beam 20 is welded to the flange mounting portion 13c of the annular bodies 13A and 13B fixed to the steel pipe column 11 to complete the actual mounting of the steel beam. As shown in FIG. 10, the lower part 11A of the upper steel tube column 11 is joined to the upper part of the steel tube column 11 of each steel tube column 10 by welding or the like. In the same manner as described above, the steel beams of each floor are temporarily attached to each steel column of the upper layer, concrete is filled inside each steel column, prestress is introduced into the steel column filled with concrete, and hardened concrete Concrete is filled in the gap between the upper surface and the lower surface of the closing plate, and each steel beam is permanently attached to each steel column. In a similar manner, build an even higher skeleton and build a multi-story building with filled concrete steel columns. The load applied to the steel beams 20 and the like increases with the progress of construction, the loading of equipment into the building, and the use of the building. Then, the load applied to the steel beam acts on the steel pipe column 11 of the filled concrete steel pipe column 10 via the steel beam 20 as a bending moment and an axial force. This bending moment is received by the steel tube column 11 itself. The axial force acting on the steel pipe column 11 is transmitted to the filled concrete 16 via a closing plate 12 constituting an axial force transmission member fixed by welding to an upper inner peripheral portion of the steel pipe column 11 of one section. Therefore, the vertical force acting on the multi-story building can be supported by the steel pipe columns 11 and the filled concrete 16.

[0012]

According to the present invention, the following effects (a) to ( f ) can be obtained by providing the structure described in the claims. (A) In the construction method according to the first aspect, the upper surface of the uncured concrete is pressed by the pressure of the fluid to apply a tensile force to the steel pipe column, and the concrete is hardened in the presence of the tensile force. In addition, the adhesive force between the outer peripheral surface of the filled concrete and the inner peripheral surface of the steel pipe column can be increased, and the concrete is filled between the upper surface of the hardened filled concrete and the lower surface of the closing plate. The prestress introduced into the concrete steel pipe column can be maintained, and the burden rate of the axial force of the concrete filled in the steel pipe column is increased. Therefore, the advantages of the filled concrete steel pipe column can be fully exhibited. (B) According to the second and third aspects, steel pipe columns of each floor are temporarily attached to beam attachment members of each floor by using steel pipe columns having a length of 2 to 4 stories to which a closing plate is fixed at the top. Later, since a tensile force is applied to the steel pipe column, prestress can be introduced while a certain load is applied to the steel pipe column. (C) According to the fourth and fifth aspects, a closed space can be easily formed above the steel pipe column on the upper surface of the filled concrete, and the pressing of the uncured concrete on the upper surface is facilitated, so that the construction of the building is facilitated. It becomes possible to introduce prestress into the filled concrete steel tubular column. (D) According to the sixth aspect, it is only necessary to fix a steel closing plate having an opening to the upper part of the column main body for 2 to 4 floors, as in the conventional inner diaphragm type. Since it is not necessary to fix a pair of inner diaphragms at all beam mounting positions, relatively inexpensive ready-made steel pipes can be used, and simple cutting and welding work can be used to reduce the cost of steel pipe columns for filled concrete steel pipe columns. Can be provided. (E) According to the seventh and eighth aspects, the work of attaching a steel beam or the like to the steel pipe column becomes easy. (F) According to the ninth aspect, the work of joining the closing plate to the column body, the work of joining the filled concrete steel pipe column to the steel pipe column, the work of filling concrete into the steel pipe column, and the like can be easily performed. Are not concentrated on the beam mounting portion and its vicinity , and workability is improved .

[Brief description of the drawings]

FIG. 1 is a front view of a steel pipe column of an embodiment, taken along line AA of FIG.

FIG. 2 is a plan view of the one in FIG.

FIG. 3 is a front view showing a vertical section of an upper part of a steel pipe column to which a steel beam of the embodiment is temporarily attached.

FIG. 4 is a front view of the concrete-filled steel tubular column of the embodiment, which is cut along the upper portion thereof.

FIG. 5 is a front view of a steel pipe column having a pressure-resistant lid attached to the top of the embodiment, which is cut longitudinally.

FIG. 6 is a front view showing a state in which fluid pressure is applied to the upper surface of the filled concrete according to the example by cutting through a steel pipe column and the like.

FIG. 7 is a front view showing a vertical section of a steel pipe column having another pressure-resistant lid attached to the top of the embodiment.

FIG. 8 is a diagram conceptually showing the relationship between the adhesive force between the filled concrete and the steel pipe column and the height of the steel pipe column in the example.

FIG. 9 is a front view showing a steel pipe column or the like filled with concrete between the filled concrete and the pressure-resistant lid according to the embodiment;

FIG. 10 is a front view showing a vertical section of an upper part of a filled concrete steel pipe column of a lower floor to which a steel pipe column of an upper floor of the embodiment is attached.

FIG. 11 is a plan view of a connection of a steel pipe column for a conventional inner diaphragm type filled concrete steel pipe column.

FIG. 12 is a front view of FIG. 11 taken along the line BB.

FIG. 13 is a plan view of a connection of a steel pipe column for a filled concrete steel pipe column of a conventional outer diaphragm type.

FIG. 14 is a front view of FIG. 13 taken along the line CC.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Filled concrete steel pipe pillar 11 Steel pipe pillar 11A Lower part of upper steel pipe pillar 11a Inner peripheral part 12 Closure plate 12a Outer peripheral part 12b Opening 13A Annular body 13B Annular body 13c Flange attachment part 14 Gusset plate 15 Steel pillar body 16 Filled concrete 17 Pressure resistance Lid 18 Fluid supply pipe 19 Concrete 20 Steel beam 20a Flange 20b Web

Claims (9)

(57) [Claims] 1. A steel pipe column having a closing plate fixed to the top is built at a column forming position of a lower skeleton, concrete is filled into each steel tube column, and a pressure-resistant lid is attached on the closing plate of the steel column.
A closed space is formed on the filled concrete, a pressurized fluid is supplied into the closed space, the upper surface of the uncured concrete is pressurized, and a tensile force is applied to the steel pipe column. The concrete concrete is hardened, the tensile force is removed after the hardening of the concrete, the pressure-resistant lid is removed, and the concrete is filled between the upper surface of the hardened concrete and the lower surface of the closing plate. A construction method that introduces prestress. 2. A steel pipe column having a length of 2 to 4 floors having a blocking plate fixed to the top is built at a plurality of column formation positions of the lower frame,
Temporarily attach steel beams on each floor to beam mounting members on each floor of steel pipe columns,
Concrete is filled into the inside of each steel pipe column, a pressure-resistant lid is attached on the closing plate of the steel column, an enclosed space is formed on the filled concrete, and a pressurized fluid is supplied into the enclosed space. The upper surface of the hardened concrete is pressurized, a tensile force is applied to the steel pipe column, the concrete is hardened in the presence of this tensile force, the tensile force is removed after the hardening of the concrete, the pressure-resistant lid is removed, and the hardened concrete is removed. A construction method that introduces prestress into a filled concrete steel pipe column, characterized by filling concrete between the upper surface of the floor and the lower surface of the closing plate, and permanently attaching steel beams of each floor to the steel pipe column. 3. A steel pipe column having a length of 2 to 4 floors having a blocking plate fixed to the top is built at a plurality of column formation positions of the lower skeleton.
Temporarily attach steel beams to the beam attachment members on each floor of the steel column, fill concrete inside each steel column, attach a pressure-resistant lid on the closing plate of the steel column, and create a closed space on the filled concrete. Forming and supplying a pressurized fluid into this enclosed space, pressurizing the upper surface of the uncured concrete, applying a tensile force to the steel pipe column, curing the concrete in the presence of this tensile force, and hardening the concrete Later, the tensile force is removed, the pressure-resistant lid is removed, concrete is filled between the upper surface of the hardened concrete and the lower surface of the closing plate, steel beams of each floor are permanently attached to the steel pipe columns, and the prestress is introduced. It is characterized by building a steel column on the top of a concrete steel column in a similar manner, and performing work such as attaching beam steel to the steel column, filling concrete, introducing prestress, etc. to build a multi-layered building. Filling Construction methods to introduce a pre-stress to the Nkurito steel pipe columns. 4. A closing plate is fixed inside a steel pipe column slightly lowered from an upper end, a housing portion is formed above the closing plate, and at least a lower portion of the pressure-resistant lid is housed in the housing portion. The construction method according to any one of claims 1 to 3, wherein a steel pipe column and a pressure-resistant lid are used, which are detachably fixed to the top of the steel pipe column. 5. A pressure-resistant lid having a fluid introduction hole, connecting the fluid introduction hole and a pressure fluid supply source via a fluid supply pipe, and supplying a pressure fluid to a space closed by the pressure-resistant lid. The construction method according to any one of claims 1 to 3, wherein the method is used. 6. As a steel pipe column, a ready-made steel pipe is cut into a length of 2 to 4 stories to form a steel pipe column, and concrete is placed in a steel pipe column which is not far from the upper end of the steel pipe column. 6. A steel closing plate having an opening for filling is arranged, and a portion around the closing plate is welded to an inner peripheral portion of the steel pipe column by welding. The construction method described in one section. 7. A steel pipe column wherein a beam mounting member is attached to two to four beam mounting positions of a single-section steel pipe column having a length of 2 to 4 stories.
The construction method according to any one of the above items. 8. The construction method according to claim 1, wherein a bristles having a pair of outer diaphragms and a gusset plate attached to a beam attachment position are used as the steel pipe columns. As 9. tubular columns, one of the section to the beam mounting member corresponding to each floor claims 1, characterized in that use shall Oh by positioning the middle portion of the steel pipe column passages 8 The construction method described .