JPH06306946A - Concrete-filled circular-sectional steel pipe structure and execution method thereof - Google Patents

Abstract

PURPOSE:To increase bearing force and rigidity through a simple means by installing a screw type joint to a circular-sectional steel pipe column and working specified compressive force or tensile force to concrete filled into the steel pipe column and the steel pipe column. CONSTITUTION:Filling concrete 4 is placed into steel pipe columns 2 connected by a screw type joint 3 consisting of a male screw 10 and a female screw cylinder 11. A diaphragm 18 transmitting force over concrete 4 from beam materials 5 is mounted, and adhesive force between the steel pipe columns 2 and concrete 4 are separated previously. Concrete 4 is cured, and the screw cylinder 11 is rotated, and moved from the steel pipe column 2 in an upper section to the steel pipe column 2 in a lower section. Its own weight of an upper floor is worked to filling concrete 4, and compressive axial tension is introduced. The screw cylinder 11 is turned so as to be lifted, and the upper and lower steel pipe columns 2 are screwed and the upper and lower steel pipe columns 2 are connected. Accordingly, bearing force and rigidity can be increased in the whole framework.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure having a steel pipe column having a circular cross section filled with concrete, a structure having a steel pipe column having a circular cross section filled with concrete and a steel pipe brace material, and those structures. It relates to the construction method.

[0002]

2. Description of the Related Art Conventionally, as a structure in which a steel pipe is filled with concrete, a structure in which a steel pipe column is filled with concrete is known.

[0003]

In the structure having the conventional concrete-filled steel tubular column, the filled concrete in the steel tubular column can resist the compressive force, but cracks to the tensile force. However, the strength and the strength of the steel pipe column against bending are small, and the steel pipe in the concrete-filled steel pipe column has elastic local buckling against compressive force when the plate thickness becomes small, so the strength decreases. In addition, in the case of the conventional concrete-filled steel tubular columns, it is difficult to introduce a compressive force (post-compression) independently to the filled concrete, and at the construction site, it is compressed into the concrete filled with the concrete-filled steel tubular columns. Applying a force (post-compression) and at the same time applying a tensile force (post-tension) to the steel pipe column And it is also difficult. Further, at the construction site, it is difficult to apply a compressive force (post-compression) to the concrete filled in the concrete-filled steel pipe columns and at the same time to apply a tensile force (post-tension) to the column steel pipes and steel braces. Further, also in the case of the structure in which the conventional steel pipe column and the steel pipe brace material are filled with concrete, the concrete-filled steel pipe column has the above-mentioned drawbacks, and the weight of the structure on the upper floor is the concrete-filled steel pipe. It acts on the filled concrete of the column and the steel pipe part, and further on the steel frame brace, so that it is difficult to introduce a compressive force (post compression) into the filled concrete in the steel pipe.

[0004]

In order to advantageously solve the above-mentioned problems, in the concrete-filled circular cross-section steel pipe structure and the construction method thereof according to the present invention, the circular cross-section steel pipe column 2 in the concrete-filled circular cross-section steel pipe column 1 is provided. In addition, a screw joint 3 is provided to apply a predetermined compressive force or tensile force to the filled concrete 4 and the circular cross-section steel pipe column 2 filled in the circular cross-section steel pipe column 2. Further, by using the wire rope 6 and the jack 7 between the beam members 5 on the upper and lower floors, a compressive force is applied to the filled concrete 4 in the concrete-filled circular cross-section steel pipe column 1, and a tensile force is introduced into the circular-section steel pipe column 2. By doing so, the above-mentioned problems can be advantageously solved. Further, screw type joints 3 and 9 are provided in the middle part of the concrete-filled circular cross-section steel pipe column 1 and the middle part of the concrete-filled circular cross-section steel pipe brace material 8 to apply a predetermined compressive force to the filled concrete 4, and The above-mentioned problem can be advantageously solved by applying a predetermined tensile force to the circular-section steel pipe column 2 and applying a predetermined tensile force to the circular-section steel pipe brace material 8. In order to construct the concrete-filled steel pipe structure, part or all of the vertical load due to the weight of the structure on the upper floor of the construction floor is applied to the filled concrete 4 in the concrete-filled circular cross-section steel pipe column 1, and the filled concrete The above-mentioned problem can be advantageously solved by introducing a predetermined compressive force into No. 4 and reducing the load on the steel pipe portion with respect to the weight of the structure. Furthermore, in order to construct the concrete-filled circular-section steel pipe structure, a wire rope 6 and a jack 7 are used between the beam members 5 on the upper and lower floors of the building floor to fill the concrete in the concrete-filled circular-section steel pipe column 1. The above-mentioned problem can be advantageously solved by applying a compressive force to No. 4 and introducing a tensile force to the steel pipe column 2 and the circular cross-section steel pipe brace member 8 in the concrete-filled circular cross-section steel pipe column 1. Incidentally, as in the first embodiment, the shear key 18 and the attachment are cut off.

[0005]

1 to 5 show a first embodiment of the present invention. First, as shown in FIG. 1, a plurality of circular cross-section steel pipe columns 2 are arranged in series in the vertical direction, and A steel female screw cylinder 11 is screwed into a male screw 10 provided on the outer surface of the opposite end of the circular cross-section steel pipe column 2, and a vertical spacing is provided by a threaded joint 3 composed of the male screw 10 and the female screw cylinder 11. Beam members 5 made of H-section steel on the upper floor and the lower floor of the floor which connect the circular cross-section steel pipe columns 2 arranged in the
The end portion of is connected to the circular cross-section steel pipe column 2 by bolts (not shown) or welding. In addition, a shear key 18 that transmits a force from the beam 5 to the filled concrete 4 is provided inside the circular cross-section steel pipe column 2, and the adhesive force cutting between the circular cross-section steel pipe column 2 and the filled concrete 4 is further performed. .

Next, as shown in FIG. 2, a concrete filling circular cross-section steel pipe column 1 is constructed by placing a filling concrete 4 in each circular cross-section steel pipe column 2 connected by a screw joint 3. After the filled concrete 4 is hardened, as shown in FIG. 3, the female screw cylinder 11 is rotated and lowered, and the female screw cylinder 11 is moved from the upper circular cross-section steel pipe column 2 to the lower circular cross-section steel pipe column 2. , As shown in FIG.
The weight of the upper floor of the structure is applied to the filled concrete 4 to introduce a compressive axial force into the filled concrete 4. Next, as shown in FIG. 5, the internal thread cylinder 11 is rotated so as to rise, and the internal thread tube 11 is screwed into the upper and lower circular cross-section steel pipe columns 2, and the internal thread cylinder 11 is used to upper and lower circular cross-section steel tubes. The columns 2 are connected.

FIGS. 6 to 10 show a second embodiment of the present invention. First, as shown in FIG. 6, a plurality of steel pipe pillars 2 having a circular cross section are arranged in series in the vertical direction to form each circular shape. A steel female screw cylinder 11 is screwed into a male screw 10 provided on the outer surface of the opposite end of the steel pipe column 2 with a cross section, and the male screw 10 and the female screw cylinder 11 are formed.
Of the H-shaped steel beam members 5 on the upper floor and the lower floor of the floor which connect the circular cross-section steel pipe columns 2 arranged at intervals in the vertical direction with the screw type joints 3 and which have the screw type joints 3. The end portion is connected to the circular cross-section steel pipe column 2 by bolts (not shown) or welding, and in this state, the filled concrete 4 is placed in the circular cross-section steel pipe column 2,
A concrete-filled circular-section steel pipe column 1 is constructed. In addition,
As in the first embodiment, the shear key 18 and the attachment are cut off.

Next, as shown in FIG. 7, the female screw cylinder 11 is rotated and lowered, and the female screw cylinder 11 is moved from the upper circular sectional steel pipe column 2 to the lower circular sectional steel pipe column 2.

Next, as shown in FIG. 8, the lower engaging portion 12 engaged with the lower portions of the plurality of beam members 5 on the lower floor is connected to the lower end of the wire rope 6, and the plurality of beams on the upper floor are connected. The hydraulic jack 7 is placed on the upper engaging member 13 engaged with the upper portion of the material 5, the other end of the wire rope 6 is locked, and the wire rope 6 is tensioned by each jack 7, A compressive axial force is introduced into the filled concrete 4 in the circular-section steel pipe column 2.

Next, as shown in FIG. 9, the female screw cylinder 11 is rotated so as to rise, and the female screw cylinder 11 is screwed into the upper and lower circular cross-section steel pipe columns 2, and the female screw cylinder 11 is used to rotate the upper and lower circular cylinders. The cross-section steel pipe columns 2 are connected. Next, the wire rope 6, the jack 7, the lower engaging member 12 and the upper engaging member 13 are removed to bring them into the state shown in FIG.

As shown in FIGS. 11 and 12, by introducing a predetermined compressive force (post-stress) into the filled concrete 4, the structure can be treated against both compressive and tensile forces generated by an earthquake load or a wind load. Design and proof stress
The rigidity can be evenly and maximally exhibited. In addition, by introducing a predetermined tensile force (post stress) into the steel pipe column 2 with a circular cross section, both the design and yield strength / rigidity of the structure are even with respect to both compression and tensile forces generated by earthquake loads and wind loads. It can be maximized.

FIGS. 13 to 15 show a third embodiment of the present invention. First, as shown in FIG. 13, a plurality of steel pipe columns 2 having a circular cross section are arranged in series in the vertical direction to form each circular shape. A female internal thread cylinder 11 made of steel is screwed into an external thread 10 provided on the outer surface of the opposite end of the steel pipe column 2 in cross section, and a vertical spacing is provided by a threaded joint 3 composed of the external thread 10 and the internal thread cylinder 11. The circular section steel pipe columns 2 arranged are connected to each other, and the end portions of the H-shaped steel beam members 5 on the upper floor and the lower floor of the floor having the screw type joint 3 are bolted to the circular section steel pipe columns 2 (not shown). Or welded together. The first
Similar to the embodiment, the shear key 18 and the attachment are cut off.

Further, an upper joint metal fitting 14 is fixed by welding to a joint corner between the lower portion of each beam member 5 on the upper floor and the steel pipe column 2 having a circular cross section, and a lower portion is formed on the upper surface of the intermediate portion of each beam member 5 on the lower floor. Both ends of the circular cross-section steel pipe brace member 8 formed by screwing the joint fitting 15 by welding and screwing the female thread cylinder 17 into the male thread 16 of the threaded joint 9 whose middle portion is cut,
For the upper joint fitting 14 and the lower joint fitting 15,
While being connected by bolts or pins, and filled concrete 4 is poured into the circular cross-section steel pipe column 2, the circular cross-section steel pipe column 2 and the female screw cylinder 17 and the filling concrete are provided at the beam member joints in the circular cross-section steel pipe column 2. A concrete-filled circular cross-section steel pipe column 1 composed of

Next, as shown in FIG. 14, when the erection of the upper floor is advanced, the vertical compressive force due to the weight of the structure acts only on the filled concrete 4, and the circular section steel pipe column 2 and the circular section steel pipe brace material are provided. Rotate each of the screw type joints 3 and 9 so that the compressive force does not act on 8
And the length of the circular cross-section steel pipe brace 8 is shortened.

When the erection is completed in this way, FIG.
As shown in FIG. 5, the compressive force acts only on the filled concrete 4, and the circular cross-section steel pipe column 2 and the circular-section steel pipe brace member 8 do not receive the compressive force due to the weight of the structure. Therefore, a structure having high bending shear rigidity and high proof stress is constructed.

FIGS. 16 to 18 show a fourth embodiment of the present invention. First, as shown in FIG. 16, the frame portion of the structure is assembled and then the steel pipe column 2 having a circular cross section is formed. After filling the filled concrete 4 into the steel, and hardening the filled concrete 4, the wire rope 6 and the jack 7 are set as shown in FIG. The screw type joints 3 and 9 are rotated so that an axial force does not act on the steel pipe brace member 8, and the lengths of the circular sectional steel pipe column 2 and the circular sectional steel pipe brace member 8 are reduced.

As described above, after a predetermined amount of axial force is applied to the filled concrete 4, the threaded joint is left as it is and the tensioning wire rope is gradually released. In order to adjust the ratio of the axial force remaining in the circular cross-section steel pipe column 2 and the circular cross-section steel pipe brace member 8, the screw type joints 3 and 9 in the circular cross-section steel pipe column 2 and the circular cross-section steel pipe brace member 8 are rotated. The lengths of the circular-section steel pipe column 2 and the circular-section steel pipe brace member 8 may be adjusted.

Next, the wire rope 6 and the jack 7 are removed and the state shown in FIG. 18 is obtained. As a result, the tensile force acts on the circular-section steel pipe brace material 8 by the amount of the compressive force acting on the filled concrete 4. Therefore, a structure skeleton having high bending shear rigidity and high yield strength is constructed.

As shown in FIGS. 19 and 20, by introducing a predetermined compressive force (post-stress) into the filled concrete 4, the structure can be treated against both compressive and tensile forces generated by an earthquake load or wind load. Design and proof stress
The rigidity can be evenly and maximally exhibited.
Further, by introducing a predetermined tensile force (post-stress) into the circular cross-section steel pipe column 2 and the circular cross-section steel pipe brace material 8, both the compressive force and the tensile force generated by the seismic load or the wind load are applied to the structure design. In addition, both proof stress and rigidity can be uniformly and maximally exerted.

[0020]

According to the present invention, by the above-mentioned means,
By exerting a compressive force (post-compression) on the filled concrete 4, it is possible to exert almost the same yield strength and rigidity with respect to each load of compression and tension. By applying tensile force (post tension), it is possible to exert almost the same proof strength and rigidity for each load of compression and tension. Furthermore, as described above, for each load of compression and tension, Since almost the same yield strength and rigidity can be exhibited, it is possible to improve the yield strength and rigidity of the concrete-filled circular cross-section steel pipe column 1 as a whole. Further, since the compressive force due to the weight of the structure is not applied to the circular cross-section steel pipe column 2 and the circular cross-section steel pipe brace member 8, it is possible to reduce the decrease in the proof stress and rigidity against the compressive force. Further, by applying a tensile force (post-tension) to the circular cross-section steel pipe column 2 and the circular cross-section steel pipe brace member 8 by the above-mentioned means, approximately the same yield strength and rigidity are exerted against each load of compression and tension. Can be made. Further, as described above, the compressive force due to the weight of the structure is almost exerted on the circular cross-section steel pipe column 2 and the circular cross-section steel pipe brace member 8 while exerting almost the same yield strength and rigidity against each load of compression and tension. By exerting a tensile force on the circular cross-section steel pipe column 2 and the circular cross-section steel pipe brace material 8 that do not act, substantially the same yield strength and rigidity can be exerted against each load of compression and tension. Therefore, in the frame of the structure having the concrete-filled steel pipe column 1 and the circular cross-section steel pipe brace member 8, it is possible to improve the yield strength and rigidity of the entire frame.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a state before concrete is poured in a first embodiment of the present invention.

FIG. 2 is a partially cutaway front view showing a state after pouring concrete according to the first embodiment of the present invention.

FIG. 3 is a partially cutaway front view showing a state where the female screw cylinder is lowered in the first embodiment of the present invention.

FIG. 4 is a front view showing a state in which the weight of the upper floor of the structure is applied to the filled concrete in the first embodiment of the present invention.

FIG. 5 is a front view showing the completed concrete-filled circular cross-section steel pipe structure of the first embodiment.

FIG. 6 is a partially cutaway front view showing a state where concrete is filled in a steel pipe column having a circular cross section in a second embodiment of the present invention.

FIG. 7 is a front view showing a state in which a female screw cylinder is lowered in the second embodiment of the present invention.

FIG. 8 is a front view showing a state where a compressive force is applied to the filled concrete by the jack and the wire rope in the second embodiment of the present invention.

FIG. 9 is a front view showing a state in which the circular cross-section steel pipe columns of the upper and lower floors are connected by an internal thread cylinder in a state where a compressive force is applied to the filled concrete.

FIG. 10 is a front view showing the completed concrete-filled circular cross-section steel pipe structure of the second embodiment.

FIG. 11 is a diagram showing load / deformation characteristics of the filled concrete in the structures of the first and second examples.

FIG. 12 is a diagram showing load / deformation characteristics of a steel pipe column having a circular cross section in the structures of the first and second examples.

FIG. 13 is a partially cutaway front view showing a state after placing concrete in the third embodiment of the present invention.

FIG. 14 is a front view showing a state in which the weight of the upper floor of the structure is applied to the filled concrete in the third embodiment of the present invention.

FIG. 15 is a front view showing the completed concrete-filled circular cross-section steel pipe structure of the third embodiment.

FIG. 16 is a partially cutaway front view showing a state after placing concrete in the fourth embodiment of the present invention.

FIG. 17 is a front view showing a state where compressive force is applied to the filled concrete by the jack and the wire rope in the fourth embodiment of the present invention.

FIG. 18 is a front view showing the completed concrete-filled circular cross-section steel pipe structure of the fourth embodiment.

FIG. 19 is a diagram showing load / deformation characteristics of the filled concrete in the structures of the third example and the fourth example.

FIG. 20 is a diagram showing load / deformation characteristics of a steel pipe column having a circular cross section and a steel pipe brace material having a circular cross section in the structures of the third and fourth examples.

[Explanation of symbols]

 1 Concrete-filled circular cross-section steel pipe column 2 Circular cross-section steel pipe column 3 Screw joint 4 Filled concrete 5 Beam material 6 Wire rope 7 Jack 8 Circular cross-section steel pipe brace material 9 Screw type joint 10 Male screw 11 Female screw cylinder 12 Lower engaging member 13 Upper engagement Mating member 14 Upper joint metal fitting 15 Lower joint metal fitting 16 Male screw 17 Female screw cylinder 18 Diaphragm or shear key

Claims (7)

[Claims] 1. A screw-type joint 3 is provided on a circular-section steel pipe column 2 in a concrete-filled circular-section steel pipe column 1.
A method for constructing a concrete-filled circular-section steel pipe structure in which the concrete 4 filled in the circular-section steel pipe column 2 and a concrete compressive force or a tensile force applied to the circular-section steel pipe column 2 are applied. 2. A screw-type joint 3 is provided on a circular-section steel pipe column 2 in a concrete-filled circular-section steel pipe column 1.
A concrete-filled circular section steel pipe structure in which the concrete 4 filled in the circular section steel tube column 1 and a concrete compressive force or a tensile force applied to the circular section steel tube column 1 are applied. 3. A predetermined compressive force is introduced into the filled concrete 4 in the concrete-filled circular cross-section steel pipe column 1 by the self-weight of the upper floor structure, and the compressive load of the circular cross-section steel pipe column 2 with respect to the weight of the structure is applied. Claim 2 to reduce
Concrete-filled steel pipe circular section steel pipe structure. 4. A compressing force is applied to the filled concrete 4 in the concrete-filled circular cross-section steel pipe column 1 by using the wire rope 6 and the jack 7 between the beam members 5 on the upper and lower floors, and the circular cross-section steel pipe column 2 is provided. Introducing a tensile force.
Construction method of concrete-filled circular cross-section steel pipe structure. 5. Threaded joints 3, 9 are provided at an intermediate portion of a circular cross-section steel pipe column 2 and a circular cross-section steel pipe brace member 8 in a concrete-filled circular cross-section steel pipe column 1,
Concrete-filled circular cross-section steel pipe structure in which a predetermined compressive force is applied to the filled concrete 4 and a predetermined tensile force is applied to the circular-section steel pipe column 2 to exert a predetermined tensile force on the circular-section steel pipe brace material 8. object. 6. In order to construct the concrete-filled steel pipe structure, part or all of the vertical load due to the weight of the structure on the upper floor of the construction floor is applied to the filled concrete 4 in the concrete-filled circular cross-section steel pipe column 1. A method for constructing a concrete-filled circular cross-section steel pipe structure, which introduces a predetermined compressive force into the filled concrete 4 and reduces the load of the circular-section steel pipe column 2 on the weight of the structure. 7. A concrete-filled circular cross-section steel pipe column 1 is constructed by using a wire rope 6 and a jack 7 between the beam members 5 on the upper and lower floors of the construction floor to construct the concrete-filled circular cross-section steel pipe structure. Compressive force is applied to the filled concrete 4, and the concrete filled circular section steel pipe column 1
A method for constructing a concrete-filled circular-section steel pipe structure in which tensile force is introduced into the circular-section steel pipe column 2 and the circular-section steel pipe brace material 8 in.