JPH0988238A - Steel-pipe reinforced concrete column - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate manufacture, and to increase the strength of a column. SOLUTION: In a steel-pipe reinforced concrete column 10, in which concrete C is placed into a closed type steel plate 11 extended in the axial direction of the column, steel bars 12 are penetrated into the concrete column for constraining the deformation of the closed type steel plate 11 while nuts 13 as clamping means, which are engaged with the closed type steel plate 11 and deformation force applied to the closed type steel plate 11 is borne to the steel bars 12, are clamped at both end sections of the steel bars 12 projected from the closed type steel plate 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel pipe concrete column formed by placing concrete inside a closed type steel plate made of a square or circular steel pipe or the like.

[0002]

2. Description of the Related Art Conventionally, as one of the pillar members of a structure, instead of the shear reinforcing bar used for a reinforced concrete column, a closed type steel plate made of a square or circular steel pipe or the like is used, and a reinforcing bar or the like is placed inside the steel plate. There is a steel pipe concrete column made by placing concrete in here, and as a structure to enhance the strength of this, particularly the axial strength and shear strength of the column, for example,
There is a closed type steel plate in which an iron plate having a cross-shaped cross section is extended in the axial direction of a column.

That is, as shown in FIG. 3, the above-mentioned structure has two pieces inside a closed type steel plate 31 made of a steel pipe having a substantially rectangular cross section, which is arranged inside a steel pipe concrete column 30 having a rectangular cross section, for example. The iron plates 32, 32 of which are cross-shaped in combination are fixed by welding.

When an axial force and a shearing force are applied to a reinforced concrete column, the concrete expands and is deformed in the lateral direction, cracks occur in the concrete portion, and there is a risk that the concrete will fall off. On the other hand, in the above-mentioned steel tube concrete column 30, by restraining this deformation (expansion) by the closed type steel plate 31 on the outer periphery, and further by restraining the closed type steel plate 31 by the iron plate 32 having a cross-shaped cross section disposed inside. , Axial strength and shear strength can be increased.

[0005]

However, in the above structure, since the two iron plates 32, 32 are combined in a cross shape and then attached in the closed type steel plate 31 by welding, welding or the like is required. The work must be performed in a closed place inside the closed-type steel plate 31, which causes a problem that the work becomes complicated.

Further, in the above structure, a compressive force acts in the axial direction of the steel tube concrete column 30 to cause the closed type steel plate 31 inside.
When distortion occurs in the closed type steel plate 31, the closed type steel plate 31 may be deformed so as to expand in the radial direction, and tensile force or tensile force may be applied to the welded joint portions 33 and 33 between the closed type steel plate 31 and the iron plates 32 and 32 therein. There was a fear that this portion would break due to the shearing force. Therefore, conventionally, the above-mentioned welded joint portions 33, 33 have been used.
Need to be increased, and the work is complicated, and this is one of the causes of the increase in manufacturing cost.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a steel pipe concrete column which is easy to manufacture and can improve the strength of the column.

[0008]

In order to achieve the above object, the steel pipe concrete column of the present invention is a steel pipe concrete column formed by placing concrete inside a closed type steel plate extending in the axial direction of the column. In order to restrain the deformation of the closed type steel plate, a steel rod is penetrated into the closed type steel plate, and both ends of the steel rod projected from the closed type steel plate are engaged with the closed type steel plate. The fastening means for supporting the deforming force applied thereto on the steel rod is fastened (Claim 1).

Further, in the steel pipe concrete pillar, a plurality of reinforcing bars are arranged on the outer surface of the closed type steel plate along the axial direction of the pillar, and a net member is arranged so as to cover the outside of these reinforcing bars. It is preferable to coat the surfaces of the reinforcing bars and the net member with concrete or mortar so as to be embedded (claim 2).

According to the steel pipe concrete pillar of the present invention having the above structure, the steel rod is penetrated into the closed type steel plate, and the both ends of the steel rod are tightened with the closed type steel plate. By fastening, the deformation force applied to the closed steel plate is supported by the steel rod. That is, for example, the closed type steel plate and the steel rod restrain the deformation of the concrete portion so as to expand in the radial direction by the compressive force acting in the axial direction of the concrete portion, thereby preventing the steel pipe concrete column from being distorted. As a result, the strength in the axial direction of the steel pipe concrete column can be increased.

Further, according to the steel pipe concrete column of the invention as defined in claim 2, the concrete or mortar for covering the closed type steel plate with the reinforcing bars and the net member arranged on the outer surface of the closed type steel plate and the closed type steel plate are provided. The adhesive strength can be enhanced. Since such a mesh member is arranged with a distance from the outer surface of the closed-type steel plate or the like by a reinforcing bar, it is possible to make concrete or the like covering these around the back surface of the mesh member, and by the biting effect of concrete or the like, It is possible to enhance the adhesive strength. In addition, since the reinforcing bars are arranged along the axial direction of the column, the axial force of the steel pipe concrete column can be enhanced also by this.

[0012]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 and 2 show a steel pipe concrete column 10 according to an embodiment of the present invention.

In the present embodiment, the steel pipe concrete column 10 is made by placing concrete C inside a closed type steel plate 11 having a rectangular cross section, and the column main bar is laid inside this.

In the steel pipe concrete column 10, the closed type steel plate 11 is penetrated through the inside of the steel rods 12 and 1.
2 are arranged, and nuts 13 as fastening means are attached to the both ends of the steel rod 12 that protrude from the closed type steel plate 11 from the outside of the closed type steel plate 11. Then, the nut 13 engages with the closed type steel plate 11 and when it is fastened, the deformation force applied to the closed type steel plate 11 is supported by the steel rod 12 to restrain the deformation of the closed type steel plate 11.

In the present embodiment, the closed type steel plate 11 is
It is manufactured as a precast pipe that uses a square steel pipe and concrete is arranged on the outer periphery of the steel pipe, and is built in the planned location of the steel pipe concrete pillar 10 by site work, and concrete C is placed inside this. It is used as a structure that also serves as a pillar formwork to be installed. In addition, on the outer surface 11a of the closed type steel plate 11, holes 11b, 11b for inserting the steel rods 12 are provided by arranging two rows in the height direction thereof.

The closed-type steel plate 11 is formed by rotating the closed-type steel plate 11 so as to cast concrete on the inner peripheral surface thereof, so-called centrifugal molding, or by a vertical slump production method, or by a slump method. It is manufactured as a precast pipe by the so-called Bicon manufacturing method in which almost zero concrete is cast on the outer peripheral part and then compressed from the top, and in the field work, after assembling the main pillars of the column, the precast space is inserted from the top, and the concrete C To place.

According to the Bikon manufacturing method, since the unit water amount is small, it is possible to prevent cracking due to drying shrinkage of the concrete C, and it is advantageous in that the manufacturing cost is low.

In this embodiment, a square steel pipe is used as the closed type steel plate 11, but the present invention is not limited to this. For example, a steel pipe having a circular cross section or four steel plates is used. It is also possible to use those formed in a rectangular cross section and joined by welding or the like.

The steel rod 12 is a rod-shaped member having threaded portions 12a, 12a forming a tightening means formed on both ends thereof, and a PC steel rod is used in this embodiment. Then, the steel rods 12 are inserted into the holes 11b, 11b arranged opposite to each other in the closed type steel plate 11 and arranged in a well shape inside the closed type steel plate 11.

The steel rods 12 are arranged on the closed type steel plate 11 as the above-mentioned precast pipe.
It may be arranged immediately after being manufactured, or it may be arranged after the closed type steel plate 11 is built.

On the other hand, the nut 13 is fastened by being screwed into the threaded portion 12a of the steel rod 12 protruding from the hole portion 11b.
Is brought into contact with and engaged with the surface of the. This allows
A tensile force is applied to the steel rod 12 to tighten the closed type steel plates 11 arranged opposite to each other, and the deformation in the radial direction of the closed type steel plates 11 is restricted.

In this embodiment, the tightening means is
Although the screw portion 12a and the nut 13 are used, the present invention is not limited to this, and may be any one that can apply a tensile force to the steel rod 12, for example, pre-stressing the steel rod 12 in advance. It is also possible to dispose a wedge member at the end portion of this and tighten the closed type steel plate 11.

Further, in this embodiment, the steel pipe concrete column 10 has a closed type steel plate 11 as shown in FIG.
A plurality of reinforcing bars 14 and 14 are arranged on the outer surface 11a of the steel tube along the axial direction of the steel pipe concrete column 10, and a mesh member 15 is arranged so as to cover the outside of the reinforcing bars 14 and 14,
Concrete or mortar (not shown) is applied to the surface of these reinforcing bars 14, 14 and the net member 15 so as to be embedded therein.
Cover with.

In the present embodiment, the reinforcing bar 14 is D10.
The one having the above diameter is used. On the other hand, as the net member 15, a wire mesh is used in the present embodiment. In addition to the wire mesh, a mesh member formed of punching metal or synthetic resin can be used as the mesh member 15.

Steel pipe concrete column 10 having such a structure
According to this, by fastening the nuts 13 as fastening means attached to both ends of the steel rod 12, this is engaged with the closed type steel plate 11, and the deformation force of the closed type steel plate 11 is increased. Support. That is, the concrete portion inside the closed type steel plate 11 is prevented from being radially expanded by the compressive force acting in the axial direction thereof by the closed type steel plate 11 and the steel rod 12 to prevent the steel pipe concrete column 10 from being distorted. , Its axial strength can be increased.

Further, as in this embodiment, the closed type steel plate 1
If a plurality of rebars 14, 14 are arranged on the outer surface 11a of No. 1 and a net member 15 is arranged so as to cover the outside of these rebars 14, 14 and these surfaces are covered with concrete or mortar, concrete Alternatively, the adhesion strength between the mortar and the closed type steel plate 11 can be increased.

That is, the mesh member 15 is arranged by the reinforcing bar 14 at a distance from the outer surface 11a of the closed type steel plate 11 and allows concrete or the like to wrap around to the back surface of the mesh member 15. It is possible to enhance the adhesive strength. In addition, the rebar 1
Since 4 and 14 are arranged along the axial direction of the column, the axial force of the steel pipe concrete column 10 can be enhanced also by this.

[0028]

As described above in detail, according to the steel pipe concrete column of the present invention having the above-mentioned constitution, the steel rod is penetrated into the closed type steel plate, and both ends of the steel rod are penetrated. By fastening the fastening means that engages with the closed type steel plate, the steel rod is made to support the deformation force applied to the closed type steel plate. That is, for example, the closed type steel plate and the steel rod restrain the deformation of the concrete portion so as to expand in the radial direction by the compressive force acting in the axial direction of the concrete portion, thereby preventing the steel pipe concrete column from being distorted. As a result, the strength in the axial direction of the steel pipe concrete column can be increased.

Further, according to the steel pipe concrete column of the invention as defined in claim 2, adhesion of concrete or mortar covering the closed type steel sheet and the closed type steel sheet by the reinforcing bars and net members arranged on the outer surface of the closed type steel sheet. Strength can be increased. Since such a mesh member is arranged at a distance from the outer surface of the closed-type steel plate by a reinforcing bar, it is possible to cause concrete or the like covering them to wrap around to the back surface of the mesh member, and the above-mentioned adhesion due to the biting effect of concrete or the like. Strength can be enhanced. In addition, since the reinforcing bars are arranged along the axial direction of the column, the axial force of the steel pipe concrete column can be enhanced also by this.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a steel pipe concrete column according to the present invention.

FIG. 2 is a perspective view showing an embodiment of a steel pipe concrete column according to the present invention.

FIG. 3 is an explanatory view showing a conventional steel pipe concrete column of a beam.

[Explanation of symbols]

 10 Steel Tube Concrete Column 11 Closed Steel Plate 12 Steel Rod 13 Nut (Tightening Member) 14 Reinforcing Bar 15 Net Member

Claims (2)

[Claims] 1. A steel pipe concrete pillar comprising concrete cast inside a closed type steel plate extending in the axial direction of the column, wherein steel is provided inside the closed type steel plate to restrain deformation of the closed type steel plate. Fastening means was fastened to both ends of the steel rod which penetrated the rod and protruded from the closed type steel plate so as to support the deformation force applied to the closed type steel plate to the steel rod. A steel pipe concrete column that is characterized by that. 2. The steel pipe concrete pillar according to claim 1, wherein a plurality of reinforcing bars are arranged on the outer surface of the closed type steel plate along the axial direction of the pillar, and a mesh is provided so as to cover the outside of these reinforcing bars. A steel pipe concrete column, wherein members are arranged and their surfaces are covered with concrete or mortar so as to embed the reinforcing bars and the net member.