JP2001049739A - Reinforcement structure of column-to-beam connection part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcement structure of column-to-beam connection part capable of reinforcing a connection part at any shearing strength without providing through-holes in webs of a beam steel frame and allowing welding operation to be performed easily. SOLUTION: This reinforcement structure of a column-to-beam connection part is formed so that steel plates 30a having several groove holes 30b provided therein approximately in parallel with each other are bent, from the outside of the column 10, in a connection part between an RC or SRC column 10 and an S or SRC beam 20 along the arrangement of column main reinforcements 12 so as to wind around the column main reinforcements 12. Then, these steel plates are disposed as reinforcement plates 30, and both end faces of the reinforcement plates 30, 30 are connected by welding to the webs of the beam steel frames 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforced concrete structure (hereinafter referred to as "RC structure") or a steel frame reinforced concrete structure (hereinafter referred to as "SRC structure"). This is applied to a joint with a steel frame (hereinafter referred to as “S frame”) or SRC frame beam.

[0002]

2. Description of the Related Art For example, as shown in FIG. 4, a conventional reinforcement structure for a joint between SRC columns and beams is generally used. That is, the L-shaped split bands 35 are inserted into the through-holes 21a provided in the web of the beam steel frame 21, respectively, and the shear reinforcement is provided as if the strip bars 13 of the upper and lower columns 10 were continuously installed at this joint. The streaks are formed, and the ends of the split band 35 are lap jointed and then further flared.

[0003]

However, such a reinforcing structure has the following problems. (1) Since the through-hole 21a is provided in the web of the beam steel structure 21, a cross-sectional defect of the beam steel structure 21 occurs, and the shear strength of the joint is reduced. (2) Therefore, it is necessary to reduce the diameter of the through-holes 21a and to reduce the number (to increase the interval) as much as possible.
The diameter, number, and arrangement of the split bands 35 are limited, and it may be difficult to sufficiently reinforce the joint. (3) In addition, it is necessary to perform flare welding at four locations for one split band 35, and this must be performed for all the number of split bands 35, so that the welding operation is complicated. The problems of (1) to (3) are that the S or SRC beam having the beam steel structure 21 is
This is caused by a joint portion to be joined to a RC or SRC column having the following.

[0004] In view of the above problems, the present invention provides a pillar that can reinforce a joint with an arbitrary shear strength without providing a through hole in a beam steel beam web and can simplify welding work. An object of the present invention is to provide a reinforcing structure for a beam joint.

[0005]

That is, the invention according to the first aspect of the present invention is directed to a joint between a reinforced concrete or steel reinforced concrete column and a steel or steel reinforced concrete beam. A steel plate provided substantially in parallel with each other is bent along the arrangement of the main reinforcement of the column so as to wind the main reinforcement from the outside of the column, and is disposed as a reinforcing plate, and both sides of each of the reinforcing plates are arranged. A reinforcing structure for a beam-column joint, wherein each end face is welded to a steel web of the beam.

In such a column-beam joint reinforcement structure,
The portion of the steel plate between the slots in the reinforcing plate plays a role similar to that of the conventional split band, but since there is no through hole in the steel web of the beam, there is no cross-sectional loss of the steel frame of the beam. Further, by adjusting the strength of the steel sheet itself, the length, width, interval, and the like of the slot, the joint can be reinforced with an arbitrary shear strength. Further, unlike the related art, the number of welding locations does not increase in accordance with the number of split bands, and it is sufficient to weld only two locations on one reinforcing plate, so that the welding operation can be simplified.

The invention according to a second aspect of the present invention relates to a joint between a reinforced concrete or steel reinforced concrete column and a steel or steel reinforced concrete beam, a narrow steel plate is formed along the arrangement of the main reinforcement of the column. The main reinforcement is bent from the outside of the column so as to be wound thereon, and a plurality of the narrow bars are arranged substantially parallel to each other at regular intervals, and both end surfaces of each of the narrow steel plates are welded and joined to the steel web of the beam. And a reinforcing structure for a beam-column joint.

In such a column-beam joint reinforcement structure,
The narrow steel plate plays the same role as the conventional split band,
Since no through-hole is provided in the web of the steel frame of the beam, no cross-sectional loss of the steel frame of the beam occurs. In addition, strength and width of narrow steel plate,
By adjusting the arrangement interval and the like, the joint can be reinforced with an arbitrary shear strength.

[0009]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, the same reference numerals are used for the same elements, and duplicate descriptions are omitted.

FIGS. 1A and 1B show an embodiment of a reinforcing structure for a beam-column joint according to the present invention, wherein FIG. 1A is an external perspective view, and FIG. Here, reference numeral 10 denotes a column, reference numeral 20 denotes a beam, and reference numeral 30 denotes a reinforcing plate. Hereinafter, the significance of the present invention will be clarified by detailing the configuration, operation, and the like of each of these components.

1. The column 10 is made of SRC in this case, and has a column steel frame 11 of a cruciform steel assembled by welding, a column main bar 12 arranged on the outer periphery in parallel with the column steel frame 11, and a column main bar 12. It is composed of a stirrup 13 wound around the outer periphery thereof and concrete (not shown) cast to cover all of them. In the present invention, the only condition required for the pillar 10 is that the pillar is made of SRC or RC, that is, that the pillar main bars 12 and the band bars 13 in the present embodiment exist. The present invention relates to SRC or R
This is because the purpose is to form a joint having the same function as the stirrup of the column in the C-structure at the joint of the column and beam.
Therefore, the cross-sectional shape and dimensions of the column steel frame 11 are not limited in the case of the SRC structure, and the cross-sectional shape of the column 10, the main bar 12,
Arrangement, diameter, pitch, etc.

2. Here, the beam 20 is made of SRC and is made of an H-shaped steel beam 21.
And beam main reinforcing bar 2 arranged on the outer periphery in parallel with beam steel frame 21
2, stirrups 23 wound around the outer periphery of the beam main bar 22 so as to restrain them, and concrete (not shown) cast to cover all of them. The only condition required for the beam 20 in the present invention is that the beam is SRC or S-shaped, that is, that the beam steel frame 21 in this embodiment exists. In order to achieve the above object, the present invention provides a reinforcing plate 3 described below.
This is because the means of welding both side end portions of the steel sheet to the steel web of the beam is adopted. Therefore, in the case of the SRC structure, the arrangement, the diameter, the pitch, etc. of the beam main reinforcement 22 and the stirrup 23 do not matter, and the number and arrangement of the beams 20 and the cross section of the beam steel structure 21 in the case of the SRC or S structure. It does not matter what shape or size.

3. Reinforcement Plate The reinforcement plate 30 is obtained by bending a rectangular steel plate 30a provided with a predetermined slot 30b in half so as to have an L-shaped cross section. Here, as shown in FIG. 2A which is a developed view of the reinforcing plate 30 and FIG. 2B which is a cross-sectional view taken along the line AA in FIG. 2, the slot 30b is substantially parallel to the long side of the steel plate 30a. There are multiple articles. The reason that the slot 30b has such a form is that the adjacent slots 30b, 3
This is because the reinforcing plate 30 is formed in the same shape as the shear reinforcing bar at the conventional beam-column joint, expecting that the portion of the steel plate 30a between 0b plays the same role as the band reinforcing bar 13.
By adjusting the shape of the slot 30b and the strength of the steel plate 30a itself, the joint between the column 10 and the beam 20 can be reinforced with an arbitrary shear strength.

The steel plate 30 having no slot 30b is provided.
a using a reinforcing plate (not shown) consisting only of
A plurality of flat bars 31 each of which is a narrow steel plate as shown in (c) and (d) and which is bent into an L-shaped cross section are prepared, and these are arranged at a predetermined interval so as to be substantially parallel to each other. As an alternative, similarly, the pillar 10 and the beam 2
0 can be reinforced with any shear strength. Further, beam steel frames 2 are provided on both side end surfaces of the steel plate 30a and the flat bar 31.
A groove 30c for penetration welding to one web is provided. The shape of the groove 30c is appropriately changed according to the type of welding.

As shown in FIG. 1, the reinforcing plate 30 having such a configuration is disposed at the joint between the column 10 and the beam 20 so that each of the corners is in contact with the column main bar 12 at the four corners of the column 10. Further, both side end faces are welded to the web of the beam steel frame 21. Therefore, the welding operation is completed in eight places in total, so that the labor of welding is greatly reduced as compared with the related art (see FIG. 4).

Further, if such welding work of the reinforcing plate 30 is performed in a factory in advance, it is necessary for the blacksmith to go up to the scaffold and perform welding after the reinforcement of the joint between the column 10 and the beam 20 is completed on site. This eliminates the need for on-site work and improves the reliability of the quality of the weld. In addition,
In the case where the rebar pre-assembly method in which the column main reinforcement 12 is assembled in a factory in advance is adopted, the construction period can be further shortened by further reducing the on-site work.

As described above, in the present embodiment, the four beams 20 are used for the column 10 having a rectangular cross-section including the column steel frame 11 of the cruciform steel.
Are joined so as to be orthogonal to each other, and the joint is reinforced by four reinforcing plates 30 having an L-shaped cross section. As described above, the cross-sectional shape of the column 10 and the column The number and arrangement of 20 are not limited to the above, and the number and shape of the reinforcing plates 30 can be appropriately changed. For example, what is shown in FIG. 3A is a column-shaped steel frame 11a made of T-shaped steel instead of the column-shaped steel frame 11, and three beams 20 are joined to the column-shaped steel frame 11a. The reinforcing plate 32 is arranged. FIG.
(B) shows a configuration in which two beams 20 are joined to a column steel frame 11b of an assembled L-shaped steel, and a reinforcing plate 33 having a continuous L-shaped cross section is arranged at the joint. In FIG. 3C, two beams 20 are joined to a column steel frame 11c of H-section steel, and a reinforcing plate 32 having a U-shaped cross section is arranged.
FIG. 3 (d) shows a column steel frame 11d of a square steel pipe, and FIG. 3 (e) shows a column steel frame 11e of a circular steel pipe. Further, FIG. 3F shows three beams 2 for a column 10 ′ having a circular cross section including a steel column 11 e of a circular steel pipe.
Reference numeral 0 denotes a joint, and the joint is reinforced by three reinforcing plates 34 having an arc-shaped cross section. 3A to 3F.
Needless to say, the reinforcing plates 30, 32, 33, and 34 shown in (1) and (2) may be replaced with a plurality of the flat bars 31 arranged at predetermined intervals substantially in parallel with each other.

[0018]

As described above, in the column-beam joint reinforcing structure according to the first aspect, the portion of the steel plate between the slots in the reinforcing plate plays the same role as the conventional split band. Since there is no through hole in the steel web, no cross-sectional loss of the steel frame of the beam occurs. Further, by adjusting the strength of the steel sheet itself, the length, width, interval, and the like of the slot, the joint can be reinforced with an arbitrary shear strength. further,
The welding work does not increase in accordance with the number of split bands unlike the related art, and it is sufficient to weld only two places for one reinforcing plate, so that the welding operation can be simplified.

Further, in the invention according to claim 2, the narrow steel plate plays a role similar to that of the conventional split band, but since there is no through hole in the steel web of the beam, the cross-sectional defect of the steel frame of the beam is obtained. Does not occur. In addition, by adjusting the strength, width, arrangement interval, and the like of the narrow steel plate, the joint can be reinforced with an arbitrary shear strength.

[Brief description of the drawings]

1A and 1B show an embodiment of a reinforcing structure of a beam-column joint according to the present invention, wherein FIG. 1A is an external perspective view, and FIG.

2A is a development view of the reinforcing plate shown in FIG. 1,
(B) is an AA sectional view in (a). Also,
(C) is a front view of the flat bar, and (d) is (c).
It is AA sectional drawing in.

FIG. 3 is a cross-sectional view of a main part showing another embodiment of a reinforcement structure for a beam-column joint according to the present invention.

FIG. 4 is an external perspective view illustrating a conventional reinforcing structure for a beam-column joint.

[Explanation of symbols]

 10 Column (rectangular section) 10 'Column (circular section) 11 Column steel (cross-shaped steel) 11a Column steel (T-shaped steel) 11b Column steel (assembled L-shaped steel) 11c Column steel (H-shaped) Steel 11d Column steel frame (square steel pipe) 11e Column steel frame (circular steel pipe) 12 Column main bar 13 Band reinforcement 20 Beam 21 Beam steel 21a Through hole 22 Beam main bar 23 Stirrup 30 Reinforcement plate (Steel) L-shaped cross-section 30a Steel plate 30b Slot 30c Groove 31 Flat bar 32 Reinforcement plate (U-shaped cross-section) 33 Reinforcement plate (continuous L-shaped cross-section) 34 Reinforcement plate (arc-shaped cross-section) 35 Split band

Claims (2)

[Claims] 1. A steel plate having a plurality of slots provided substantially parallel to each other at a joint between a reinforced concrete or steel reinforced concrete column and a steel or steel reinforced concrete beam. The main bars are bent so as to be wound from the outside of the column along the arrangement of the pillars, and are arranged as reinforcing plates, and both end surfaces of each reinforcing plate are welded to the steel web of the beam, respectively. A reinforcing structure for a beam-column joint. 2. A joint between a reinforced concrete or steel reinforced concrete column and a steel or reinforced concrete beam, a narrow steel plate is formed from the outside of the column along the arrangement of the main reinforcement of the column. Bending so as to be wound, and arranging a plurality of sheets at substantially regular intervals in parallel with each other, and welding both sides of the narrow steel plate to the steel web of the beam, respectively. Reinforcement structure for beam-column joints.