JP2003082774A - Steel joint structure for steel encased reinforced concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint structure capable of easily connecting the end parts of two steels used as reinforcing materials in a steel framed reinforced concrete structure in a short time, allowing a safe connecting work even in an elevated position, and further easily connecting steels different from each other in sectional shape or size. SOLUTION: In the steel encased reinforced concrete structure comprising steels 11 and 12 having a number of projections 14 at least partially formed on the surfaces as reinforcements, the opposed end parts of the two steels 11 and 12 arranged on the same axial line are mutually butted, a cylindrical body 13 is arranged to surround both end part sides of the steels 11 and 12 with each butted end, and mortar or concrete 18 is filled in the cylindrical body 13. A number of projections 17 are formed also on the inner surface of the cylindrical body 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel-frame joint structure in a reinforced steel-framed concrete structure, and more specifically, in a concrete structure having a reinforcing bar and a steel frame inside as a reinforcing material, the steel frames arranged on one axis are The present invention relates to a structure of a joint that connects end portions.

[0002]

2. Description of the Related Art Conventionally, in a reinforced steel-framed concrete structure, an H-shaped steel is often used as a steel frame to be inserted as a reinforcing material together with a reinforcing bar. When adding a steel frame made of such H-section steel, generally, as shown in FIGS.
As shown in (b), the ends 1a of the two steel frames 1 and 2,
2a is butted, and the butted part is welded,
A typical method is to dispose the joint plate 3 on the web surface or the flange surface, or both of them so as to straddle the abutted portion of the H-section steel, and fix the joint plate 3 with high-strength bolts or rivets 4.

[0003]

However, the joint structure of the steel frame used as the reinforcing material in the conventional reinforced steel frame concrete structure uses the steel frame joint of the steel frame structure as it is, and is accompanied by such a structure. It also inherits the disadvantages.

That is, in the case of a butt-welding joint structure in which steel frames are butt welded to each other, highly accurate welding work is required by a skilled technician, which takes a very long time and secures a skilled technician. There was a problem that it was difficult to do.

Further, in the joint structure in which the joint plate 3 is arranged on the web or the flange of the H-shaped steel and fixed by the high-strength bolts or the rivets 4, it takes a considerable time to tighten all the high-strength bolts, and the construction work thereof is required. However, there is a problem that it is complicated and labor-intensive, and that confirmation (confirmation whether all high-strength bolts are tightened as designed) takes a considerable amount of time.

Further, in the method of fixing the joint plate 3 to the H-shaped steel with the rivet 4, preparation and mounting of the rivet 4 require a great deal of time and labor, and not only the construction time but also the construction cost rises. there were. Furthermore, when carrying out a steel frame joint method by butt welding or a steel frame connection method by high strength bolts or rivets at a high place,
As described above, there is a problem that it is not desirable in terms of safety because of the complexity of construction work and the demand for high accuracy.

Furthermore, a method of butting together the ends 1a, 2a of the two steel frames 1, 2 and the joint plate 3 as described above.
And the method of connecting using high strength bolt or rivet 4,
There is an important problem that a joint structure that is not effective in terms of strength cannot be obtained unless the cross-sectional shapes of the steel frames 1 and 2 to be butted are almost the same.

The object of the present invention is to solve the above-mentioned conventional problems, and it is possible to easily connect the ends of two steel frames used as a reinforcing material in a reinforced concrete structure in a short time. Another object of the present invention is to provide a joint structure that can be safely connected even at a high place and that can easily connect steel frames having different cross-sectional shapes and sizes.

[0009]

The present invention is a steel-framed joint structure in a reinforced steel-framed concrete structure, and is configured as follows to solve the above-mentioned technical problems. That is, the steel joint structure in the reinforced steel-reinforced concrete structure of the present invention is a reinforced steel-reinforced concrete structure in which a steel frame having a large number of protrusions formed on at least a part of its surface is inserted as a reinforcing material. The opposite ends of the steel frames are abutted against each other, and the tubular body is arranged so as to surround both ends of the abutted steel frames, and the inside of the tubular body is filled with mortar or concrete. A large number of protrusions are also formed on the inner surface of the body.

Further, the steel-framed joint structure in the reinforced steel-framed concrete structure of the present invention is arranged on one axis in a reinforced steel-framed concrete structure in which a steel frame having a large number of protrusions formed on at least a part of its surface is inserted as a reinforcing material. 2
One end of one steel frame is firmly fixed to the outer surface of the bottom of the bottomed tubular body, and the opposite end of the other steel frame is put into the inside from the opening of the bottomed tubular body. And the inside of the tubular body is filled with mortar or concrete, and a large number of protrusions are formed on the inner surface of the tubular body.

<Specific Structure in the Present Invention> The steel-frame joint structure in the reinforced steel-reinforced concrete structure of the present invention is composed of the above-mentioned essential components, and the components are specifically as follows. Also holds. The specific constituent element is that the steel frame is any one of H-shaped steel, I-shaped steel, groove-shaped steel, and chevron-shaped steel having a cross-sectional shape having a bay-shaped recess. At the end of the shaped steel embedded in the filled mortar or concrete, a plate member with a large number of projections on the surface is positioned so as to close the recess when viewed in cross section, and is fixed to the steel frame. It is characterized by being

Further, the steel-framed joint structure in the reinforced steel-framed concrete structure of the present invention is characterized in that the sectional shape of the tubular body is either a quadrangle or a circle.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a steel joint structure in a reinforced concrete structure of the present invention will be described in more detail with reference to the embodiments shown in the drawings. 1 to 3 show a steel joint structure (hereinafter referred to as a steel joint structure) 10 in a reinforced steel concrete structure according to the first embodiment of the present invention.
It is shown.

Steel frame joint structure 10 according to the first embodiment
Abuts opposite ends of two steel frames 11 and 12 arranged on a uniaxial line as a reinforcing material of a reinforced steel-framed concrete structure, and surrounds both end sides of the steel frames 11 and 12 abutting each other. One tubular body 13 with both ends open
Are arranged and configured.

In this embodiment, the steel frames 11 and 12 used as the reinforcing material for the reinforced steel frame concrete structure are H-shaped steel, and the flange portions 11a and 12a have H-shaped surfaces.
A large number of linear protrusions 14 extending in a direction orthogonal to the longitudinal axis of the shaped steel, that is, in the width direction of the flange portion are formed in parallel at intervals.

The protrusion 14 enhances the adhesive force with concrete or mortar, and therefore the shape of the protrusion is not particularly limited, but the most preferable shape is the flange portion 11a as shown in FIG. It is a linear shape extending in the width direction of 12a. However, the shape of the protrusion 14 may be a wavy shape extending in the width direction of the flange portion,
Alternatively, it may be formed in a dot shape or a dot shape on the surfaces of the flange portions 11a and 12a.

Steel frames 11 and 12 each made of H-shaped steel
On the end side that is abutted with each other, a large number of protrusions 15 are formed on the surface between the edges of the flange portions 11a and 12a that face each other.
The plate member 16 attached with is attached, and the side edge portion of this plate member 16 and each edge portion of the flange portion are fixed by welding.

As a result, the concave portions 11b, 12b existing on the side of the steel frame having the H-shaped cross section are replaced by the plate member 16.
And has a quadrangular cross section as shown in FIG. As a result, each steel frame end made of H-shaped steel has a total of four surfaces by adding two surfaces other than the surfaces of the flanges 11a and 12a as a surface with a protrusion, and as will be described later, the circumference of each steel frame end is described. The adhesion with the mortar or concrete placed in the can be further enhanced.

The plate member 16 has such a length that one end of the plate member 16 is located at least at the end of the steel frame to be abutted, and the other end is at a position protruding from the cylindrical body 13 surrounding the abutting end portion. It is preferably one. Therefore, it is preferable to use the plate member 16 having a length of about half the length of the cylindrical body 13 described later, or a length slightly longer than that.

By the way, in the joint structure of the two steel frames 11 and 12 arranged on one axis, the opposite ends of the respective steel frames 11 and 12 are butted against each other. Here, "butting" means that the ends come into contact with each other. It does not mean only that, but also includes a state of facing each other with a slight gap.

The tubular body 13 arranged so as to surround both ends of the steel frames 11 and 12 whose ends are abutted with each other is made of a steel plate, and has a linear shape extending in the circumferential direction on the inner peripheral surface thereof. The plurality of protrusions 17 are provided in parallel in the longitudinal direction. The protrusion 17 provided on the inner peripheral surface of the tubular body 13 also enhances the adhesive force with mortar or concrete, like the protrusion 14 provided on the surface of the flange portion of each steel frame.

Therefore, the shape of the protrusion 17 is not particularly limited, and the shape of the protrusion 17 may be a corrugated shape extending in the circumferential direction of the cylindrical body 13 or formed in a dot shape or a dot shape on the inner peripheral surface. May be. Further, in the case of this embodiment, relative positioning is performed so that the abutting end portions of the two steel frames 11 and 12 are present at positions approximately half the length of the tubular body 13 as shown in FIG. Has been done.

In this way, the mortar or concrete 18 is filled in the inside of the cylindrical body 13 which accommodates the vicinity of the abutting ends of the two steel frames 11 and 12 arranged on one axis. In other words, the mortar or concrete 18 is filled between the outer periphery of the two steel frames 11 and 12, which are formed by the plate member 16 in a square cross section, in the vicinity of the abutting ends and the inner surface of the tubular body 13.

As a result, the mortar or concrete 18 filled inside the tubular body 13 has the protrusion 14 provided on the surface of the flange portion of the steel frame, the protrusion 15 provided on the surface of the plate member 16 and the tubular body 13. Protrusion 17 provided on the peripheral surface
Acts to strongly adhere to the steel frames 11 and 12 and the tubular body 13 to integrate them, that is, the mortar or concrete 18
And the steel joint structure 10 is firmly connected to the steel joint structure 10.

When the steel-framed joint structure 10 is embedded in the concrete forming the concrete structure portion as a reinforcing material for the reinforced steel-framed concrete structure, the concrete has a cross section H as shown by an arrow 19 in FIG. Lateral recesses or depressions 1 in each of the shaped steel frames 11, 12
From the open portion near the longitudinal end of the plate member 16 that closes 1b and 12b, enter into the concave portions 11b and 12b,
As a result, the steel frame joint structure 10 is integrated with the concrete forming the concrete structure portion inside and outside.

5 to 7 show a steel joint structure 2 in a reinforced steel concrete structure according to a second embodiment of the present invention.
0 is shown. Steel joint structure 20 according to this embodiment
5 to 7 showing the first shown in FIGS. 1 to 4.
The same or corresponding components as those of the steel joint structure 10 according to the embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

Steel frame joint structure 20 according to the second embodiment
Then, of the two steel frames 11 and 12 which are arranged on one axis and which are made of H-shaped steel and have linear projections 14 formed on the surfaces of the flange portions 11a and 12a, one of the steel frames 12 has an end portion. The outer surface of the bottom portion 21a of the bottom tubular body 21 is butted and welded, and the other steel frame 11 is attached to the opening 2 of the bottomed tubular body 21.
1b into the inside, and the end is the bottom portion 21 of the bottomed tubular body 21.
It is arranged so as to simply abut against the inner surface of a.

At this time, the vicinity of the end of the steel frame 11 inserted inside from the opening 21 of the bottomed tubular body 21 (bottomed tubular body 21
(In the vicinity of the end portion mainly located inside), a plate member 16 having a large number of protrusions 15 on its surface is arranged between the edge portions of the flange portions 11a facing each other. Each edge of the flange portion is fixed by welding.

As a result, the recessed portion or recessed portion 11b existing on the side portion of the steel frame having the H-shaped cross section is closed by the plate member 16, and as a result, as shown in FIG.
The inner steel frame 11 has a rectangular cross section. The bottomed tubular body 21 is formed of a steel plate similarly to the tubular body 13 of the first embodiment, and has a linear projection 2 extending in the circumferential direction on the inner peripheral surface thereof.
Many 2 are provided in parallel in the longitudinal direction.

The protrusion 22 provided on the inner peripheral surface of the bottomed tubular body 21 also enhances the adhesive force with mortar or concrete similarly to the protrusion 14 provided on the flange surface of each steel frame 11, 12. Therefore, the shape of the protrusion 22 is not particularly limited, and may be a corrugated shape extending in the circumferential direction of the bottomed tubular body 21, or may be formed in a dot shape or a dot shape on the inner peripheral surface.

After that, of the two steel frames 11 and 12 arranged on one axis so that the ends thereof are butted against each other with the bottom portion 21a of the bottomed tubular body 21 sandwiched therebetween, the end side of one steel frame 11 is placed inside. The mortar or concrete 18 is filled inside the bottomed tubular body 21 that has been housed. In other words, the one steel frame 1 having a square cross section formed by the plate member 16
Mortar or concrete 18 is filled between the outer periphery near the end of 1 and the inner surface of the cylindrical body 21.

As a result, the mortar or concrete 18 filled inside the bottomed tubular body 21 has the projection 14 provided on the surface of the flange portion of the steel frame, the projection 15 provided on the surface of the plate member 16 and the bottomed tubular shape. The projections 22 provided on the inner peripheral surface of the body 21 act to strongly adhere to the steel frame 11 and the bottomed tubular body 21 and these are integrated, that is, firmly connected through the mortar or concrete 18, The joint structure 20 is configured.

When the steel joint structure 20 is embedded in the concrete forming the concrete structure portion as a reinforcing material of the reinforced steel-framed concrete structure, the concrete has the same H-shaped cross section as that of the second embodiment. From the open portion near the end in the longitudinal direction of the plate member 16 that closes the lateral recessed portion 11b, that is, the recessed portion 11b,
1b, so that the steel joint structure 20 is integrated with the concrete forming the concrete structure portion inside and outside.

In the steel frame joint structures 10 and 20 according to the above-described two embodiments, the tubular body 13 and the bottomed tubular body 21 each have a circular cross section, but the present invention has such a cross sectional shape. However, the present invention is not limited to this, and a tubular body having a quadrangular cross section or a tubular body with a bottom may be used.

Further, in the steel frame joint structures 10 and 20 of each of the above-described embodiments, the H-section steel is described as an example of the steel frames 11 and 12, but the present invention is also limited to the H-section steel in this respect. Instead, it is possible to use a shaped steel such as an I-shaped steel, a groove-shaped steel, or a chevron-shaped steel having a cross-sectional shape having a bay-shaped depression. Which of these shaped steels is used depends on the reinforced steel concrete structure. It is determined by taking into consideration the design strength and the like of the parts where shaped steel is used.

[0036]

As described above, according to the steel-frame joint structure of the reinforced steel-framed concrete structure of the present invention, the ends of the two steel frames used as reinforcements in the reinforced steel-framed concrete structure are abutted against each other, or Alternatively, the bottom end of the bottomed tubular body welded to the end of one steel frame is sandwiched and abutted, and only one steel frame end is surrounded by the bottomed tubular body, or both ends are opened by a tubular body. Since the ends of the steel frame are surrounded and the interior is filled with mortar or concrete, the ends of the two steel frames can be connected easily in a short time, and even at high altitudes. Connection work becomes possible.

Further, according to the steel-frame joint structure in the reinforced steel-framed concrete structure of the present invention, since the ends of two steel frames arranged on one axis are not directly connected to each other as in the prior art, Even if the two steel frames have slightly different cross-sectional shapes or slightly different sizes, the two steel frames can be joined together without lowering the connection strength.

[Brief description of drawings]

FIG. 1 is a perspective view schematically showing a steel joint structure in a reinforced steel concrete structure according to a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a steel frame joint structure in the reinforced steel frame concrete structure shown in FIG.

FIG. 3 is a transverse cross-sectional view showing the steel-frame joint structure in the reinforced steel-framed concrete structure shown in FIG. 2 taken along the line 3-3 in FIG.

FIG. 4 is a partial perspective view showing an enlarged part of the steel-framed joint structure in the reinforced steel-framed concrete structure shown in FIG. 1.

FIG. 5 is a perspective view schematically showing a steel joint structure in a reinforced steel concrete structure according to the second embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view of a steel frame joint structure in the reinforced steel frame concrete structure shown in FIG.

7 is a cross-sectional view showing the steel joint structure in the reinforced steel concrete structure shown in FIG. 6 by cutting along the line 7-7 in FIG.

FIG. 8 is a perspective view schematically showing a conventional steel joint structure.

[Explanation of symbols]

10 Steel Frame Joint Structure in Reinforced Steel Concrete Structure of First Embodiment 11 Steel Frame 11a Flange 11b Depression 12 Steel Frame 12a Flange 12a Depression 13 Cylindrical Body 14 Linear Protrusion 15 Linear Protrusion 16 Plate Member 17 Wire -Shaped protrusion 18 Mortar or concrete 19 Arrow 20 in which mortar or concrete enters the recessed portion 20 Steel joint structure 21 in the reinforced steel concrete structure of the second embodiment Bottomed tubular body 22 Linear protrusion

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tetsuya Mishima             2-10-26 Fujimi, Chiyoda-ku, Tokyo             Within Ta Construction Industry Co., Ltd. (72) Inventor Hidenori Imanishi             2-10-26 Fujimi, Chiyoda-ku, Tokyo             Within Ta Construction Industry Co., Ltd. F-term (reference) 2E125 AA04 AB01 AB02 AB05 AC15                       BB33 BD01 BD06 BE03 BF06                       CA80 CA82 EA33

Claims (4)

[Claims] 1. A reinforced steel-framed concrete structure in which a steel frame having a large number of projections formed on at least a part of its surface is inserted as a reinforcing material, and two opposite ends of the steel frame arranged on one axis are butted against each other. The tubular body is arranged so as to surround both ends of the steel frame where the parts are butted together, and the inside of the tubular body is further filled with mortar or concrete, and the inner surface of the tubular body is also numerous. Steel joint structure in a reinforced steel-reinforced concrete structure, characterized in that projections are formed. 2. A reinforced steel concrete structure in which a steel frame having a large number of projections formed on at least a part of its surface is inserted as a reinforcing material, and one end of the two steel frames arranged on one axis is provided with a bottomed cylinder. Firmly fixed to the outer surface of the bottom of the strip,
The opposite end of the other steel frame is put into the inside from the opening of the bottomed tubular body, the two steel frames are aligned on one axis, and the inside of the tubular body is filled with mortar or concrete. A steel-frame joint structure in a reinforced steel-framed concrete structure, wherein a large number of protrusions are formed on the inner surface of the tubular body. 3. The steel frame is any one of H-section steel, I-section steel, groove-section steel, and chevron-shaped section steel having a cross-sectional shape having a bay-shaped recess, and is filled in the tubular body. At the end of the shaped steel embedded in the mortar or concrete,
3. The reinforcing steel frame according to claim 1, wherein a plate member having a large number of protrusions on its surface is fixed to the steel frame at a position that closes the recess when viewed in cross section. Steel-frame joint structure in concrete structures. 4. The steel joint structure for a reinforced concrete structure according to claim 3, wherein the cross-sectional shape of the tubular body is either a quadrangle or a circle.