JP2003082766A - Steel fixing structure in steel-encased reinforced concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel frame anchoring structure for steel framed reinforced concrete structure in which a sufficient adhesion can be expected with an easy construction work in the fixing of a steel frame used as reinforcing material in a steel encased reinforced concrete structure by beams or footing. SOLUTION: In this structure for fixing the steel frame 11 having a number of projections 14 formed at least partially on the surface by the beam 12 or footing in the steel framed reinforced concrete structure comprising the steel 11, a cylindrical body 13 is arranged to surround the steel located in the beam 12 or footing, mortar or concrete 18 is filled in the cylindrical body 13, and a number of projections 17 are formed on the inner surface and outer 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 anchoring structure for 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, a structure for fixing the steel frame to a girder or footing Regarding

[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. The steel frame made of such H-section steel usually has its end located at a girder or footing in a reinforced concrete structure and is fixed there.

As a fixing structure in that case, a large number of projections are provided on the surface of the flange portion at least at the end where the steel frame is fixed. In order to obtain a higher degree of adhesion stress by preventing it, the deformed steel bars or PC strands are arranged so as to surround the H-section steel.

At this time, the projections were provided only on the surface of the flange of the H-shaped steel, and therefore effective adhesion to concrete was expected on only two surfaces. Therefore, when a sufficient fixing force cannot be secured only by the adhesion effect of the protrusions, a fixing plate is further provided on the end surface of the H-section steel in anticipation of the bearing effect.

[0005]

However, in the fixing structure of the steel frame end used as a reinforcing material in the conventional reinforced steel-framed concrete structure, the deformed steel bars or PC strands, which are expected to prevent splitting, may be closely arranged. In many cases, the construction work becomes very complicated, and the workability is extremely poor.

The object of the present invention is to solve the above-mentioned conventional problems, and it is expected that sufficient adhesion will be achieved when fixing the steel frame used as a reinforcing material to a girder or footing in a reinforced steel frame concrete structure. An object of the present invention is to provide an anchoring structure for a steel frame in a reinforced steel concrete structure that can be performed and can be easily constructed.

[0007]

The present invention is a steel-frame anchoring structure for a reinforced steel-framed concrete structure, and is configured as follows to solve the above-mentioned technical problems. That is, the present invention is a structure for fixing the steel frame to a girder or footing in a reinforced steel frame concrete structure in which a steel frame having a large number of protrusions formed on at least a part of the surface is put as a reinforcing material, and is located in the girder or footing A cylindrical body is arranged so as to surround the steel frame, and the inside of the cylindrical body is filled with mortar or concrete. It is characterized in that many projections are formed on the inner surface and the outer surface of the cylindrical body. And

<Concrete Structure in the Present Invention> The steel frame anchoring structure in the reinforced steel concrete structure of the present invention comprises the above-mentioned essential components, and the components are specifically as follows. Also holds. The concrete constituent element is a steel frame, which is 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, and is filled in a tubular body. Shaped steel embedded in concrete mortar or concrete is characterized in that a plate member with a large number of projections on the surface is fixed to the steel frame at a position that closes the recess when viewed in cross section. And

Further, in the steel anchoring structure in the reinforced steel concrete structure of the present invention, the end of the steel frame inserted as a reinforcing material in the reinforced steel concrete structure is located at the girder or footing, and the tubular body is the steel end. The steel end is fixed to the girder or footing by being arranged so as to surround the. Further, the steel-frame anchoring structure in the reinforced steel-framed concrete structure of the present invention is characterized in that the cross-sectional shape of the tubular body is either polygonal or circular.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The steel frame anchoring structure for a reinforced concrete structure of the present invention will be described in more detail below with reference to the embodiments shown in the drawings. 1 to 4 show a steel frame fixing structure (hereinafter referred to as a steel frame fixing structure) 10 in a reinforced steel concrete structure according to an embodiment of the present invention.

The steel anchoring structure 10 according to this embodiment is
When the end portion of the steel frame 11 arranged as a reinforcing material for the reinforced concrete structure is located within the girder 12 of the reinforced concrete structure as shown in FIG. 2, both ends are opened so as to surround the end portion. One cylindrical body 13 is arranged and configured.

In this embodiment, the steel frame 11 used as a reinforcing material for the reinforced steel frame concrete structure is H-shaped steel as shown in FIG. 1, and the surface of the flange portion 11a thereof has a longitudinal direction of H-shaped steel. A large number of linear protrusions 14 extending in a direction perpendicular to the axis, that is, in the width direction of the flange portion are formed in parallel with each other at intervals.

The projection 14 is intended to enhance the adhesion to concrete or mortar, and therefore the shape of the projection is not particularly limited, but the most preferred shape is the flange 11a as shown in FIG. It has a linear shape extending in the width direction. However, the shape of the protrusion 14 may be a corrugated shape extending in the width direction of the flange portion, or may be formed in a dot shape or a dot shape on the surface of the flange portion 11a.

On the end side of the steel frame 11 made of H-shaped steel, which is located in the girder 12 of the reinforced concrete structure, a large number of projections 15 are provided on the surface between the edges of the flange portions 11a facing each other. A plate member 16 made of a steel plate is arranged,
The side edge portion of the plate member 16 and each edge portion of the flange portion are fixed by welding.

As a result, the recessed portion or recessed portion 11b existing on the side of the steel frame having the H-shaped cross section is closed by the plate member 16 and has a quadrangular cross section as shown in FIG. As a result, the steel frame end portion made of H-section steel has a total of four surfaces by adding two surfaces other than the surface of the flange portion 11a as a surface with protrusions, and is arranged around the steel frame end portion as described later. The adhesion with mortar or concrete can be further enhanced.

The plate member 16 has one end located at least at the edge of the steel frame end located in the girder 12, and the other end located at a position protruding from the cylindrical body 13 surrounding the end part. Such a length is preferable. Therefore, it is preferable to use the plate member 16 having a length slightly longer than the overall length of the cylindrical body 13 described later.

The cylindrical body 13 arranged so as to surround the end side of the steel frame 11 is made of a steel plate, and linear protrusions 17 extending in the circumferential direction are formed on the inner peripheral surface and the outer peripheral surface thereof in the longitudinal direction. Are installed in parallel. The protrusions 17 provided on the inner peripheral surface and the outer peripheral surface of the tubular body 13 also increase the adhesive force with mortar or concrete, like the protrusions 14 provided on the surface of the flange portion 11a of the steel frame 11.

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 a dot shape or a dot shape on the inner peripheral surface and the outer peripheral surface. It may be formed. Steel frame 1
In the inside of the cylindrical body 13 that accommodates the vicinity of the end portion of 1,
When the girder 12 is formed, it is filled with the mortar or concrete 18 that forms the girder.

In other words, the mortar or concrete 18 is provided between the outer periphery of the steel frame 11 having a rectangular cross section by the plate member 16 and the inner surface of the tubular body 13.
At the same time that the mortar or concrete 18 is placed on the outer peripheral side of the tubular body 13 as well.

As a result, the mortar or concrete 18 filled inside the tubular body 13 has a projection 14 provided on the surface of the flange 11a of the steel frame 11, a projection 15 provided on the surface of the plate member 16 and the tubular body 13. The projections 17 provided on the inner peripheral surface of the slab act to strongly adhere to the steel frame 11 and the cylindrical body 13 and these are integrated, that is, firmly connected via the mortar or concrete 18.

At this time, when the steel anchoring structure 10 is embedded in the concrete forming the girder 12 of the reinforced steel concrete structure, the concrete is indicated by an arrow 19 in FIG.
As shown in FIG. 3, the plate member 16 that closes the side recessed portion, that is, the recessed portion 11b of the steel frame 11 having the H-shaped cross section, also enters into the recessed portion 11b from the open portion near the longitudinal end portion.

The concrete for forming the girder disposed outside the tubular body 13 is bonded to the tubular body 13 with sufficient adhesive force by the action of the protrusions 17 formed on the outer peripheral surface of the tubular body 13. As a result, the steel frame fixing structure 10 is integrated with the concrete forming the concrete structure portion inside and outside, and the steel frame fixing structure 10 is configured.

When the steel anchoring structure 10 is constructed as described above, the concrete or mortar between the tubular body 13 and the steel frame 11 which is H-shaped steel is sufficiently adhered to both of them to restrain the steel frame 11. Then, the tensile force of the steel frame 11 is transmitted to the outer tubular body 13 via concrete or mortar, so that the steel frame 11 and the tubular body 13 perform a joint function. At the same time, the tubular body 13 to which the stress has been transmitted in this manner secures its own fixing due to the adhesion of concrete or mortar arranged inside and outside thereof.

The steel frame fixing structure 10 according to the above-described embodiment
In the above, the case where the end of the steel frame used as the reinforcing material in the reinforced steel concrete structure was fixed in the girder was taken as an example, but the present invention is not limited to the case where the end of the steel frame is fixed. However, the present invention can be applied to the case where the middle part of the steel frame is fixed in the girder, for example.

Further, in the steel-frame anchoring structure 10 according to the above-described embodiment, the case where the end of the steel frame used as the reinforcing material in the reinforced steel-framed concrete structure is anchored in the girder has been taken as an example. The present invention is not necessarily limited to the case where the end of the steel frame is fixed in the girder,
For example, it can be applied to the case of fixing to footing.

Further, in the steel frame fixing structure 10 according to the above-mentioned embodiment, the tubular body 13 has a circular cross section,
The present invention is not limited to such a cross sectional shape, and a polygonal tubular body having a cross section including a quadrangle or the like may be used.

Furthermore, in the steel-frame anchoring structure 10 of the above-described embodiment, the H-section steel was described as an example of the steel frame 11, but the present invention is not limited to this also in this respect. Shaped steels such as I-shaped steel, grooved steel or chevron shaped steel having a cross-sectional shape having a dented portion can be used. Which of these shaped steels is used in a reinforced steel concrete structure. It is decided by taking into consideration the design strength and the like of the place where is used.

If concrete or mortar filled between the steel frame 11 and the tubular body 13 is filled with an expansive material or the like to apply surface pressure to the adhered surface, the fixing length of the steel frame end is further shortened. You can also do it. Further, as shown in FIG. 5, if the fixing plate 20 made of a steel plate is fixed to the end surface of the steel frame 11 put in the tubular body 13 by welding or the like, the fixing force is further secured by the bearing effect. be able to.

However, as in this embodiment, the steel frame 11
When the fixing plate 20 is fixed to the end face of the, the entrance to the side concave portion, that is, the recessed portion 11b of the steel frame 11 of concrete or mortar is blocked, so that as shown in FIGS. An opening 21 may be formed in the side of the steel frame end so that concrete or mortar can enter the recessed portion 11b with a gap between the end of the plate member 16 and the fixing plate 20. desirable.

[0030]

As described above, according to the steel frame anchoring structure in the reinforced steel concrete structure of the present invention, the end of the steel frame used as the reinforcing material in the reinforced steel concrete structure is surrounded by the tubular body, and Since the inside is filled with mortar or concrete and integrated, and it is fixed in the girder or footing, the end of the steel frame or The intermediate part can be easily fixed in a short time.

[Brief description of drawings]

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

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

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

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

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

FIG. 6 is a partial perspective view showing the configuration of another embodiment of the present invention shown in FIG. 5, in which a fixing plate is fixed to an end of a steel frame placed in a tubular body.

[Explanation of symbols]

10 Steel Reinforcement Structure in Reinforced Steel Concrete Structure 11 Steel Frame 11a Flange 11b Recess 12 Reinforcing Steel Reinforced Concrete Structure Girder 13 Cylindrical Body 14 Linear Projection 15 Linear Projection 16 Plate Member 17 Linear Projection 18 Mortar Or concrete 19 Arrow 20 mortar or concrete goes into the recessed part Fixing plate 21 Entrance of mortar or concrete

   ─────────────────────────────────────────────────── ─── 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) 2E164 AA02 BA12 BA25

Claims (4)

[Claims] 1. A structure for fixing the steel frame to a girder or footing in a reinforced steel frame 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, the structure being located at the girder or footing. The cylindrical body is arranged so as to surround the steel frame, and the inside of the cylindrical body is filled with mortar or concrete. The inner surface and the outer surface of the cylindrical body are also provided with a large number of protrusions. Steel anchoring structure in reinforced concrete structure. 2. 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. In the shaped steel embedded in the mortar or concrete, a plate member having a large number of projections on the surface is fixed to the steel frame at a position that closes the recess when viewed in cross section. The steel-frame anchoring structure in the reinforced steel-framed concrete structure according to claim 1. 3. The steel frame put into the reinforced steel frame concrete structure as a reinforcing material has an end located at the girder or footing, and the tubular body is arranged so as to surround the steel frame end. The steel frame fixing structure in the reinforced concrete structure according to claim 1 or 2, wherein the steel frame end is fixed to the girder or the footing. 4. The steel-frame anchoring structure for a reinforced steel-reinforced concrete structure according to claim 1, wherein the cross-sectional shape of the tubular body is either polygonal or circular.