JP2003119885A - Joining device having a pair of diaphragms for joining reinforced concrete column and horizontal steel beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joining structure having a pair of diaphragms for joining a reinforced concrete column and a horizontal steel beam mutually capable of performing positioning easily when joining the horizontal beam with the diaphragm and joining the diaphragm with a reinforcing bar firmly without necessitating troublesome machining of the reinforcing bar for joining the diaphragm. SOLUTION: A cylindrical body 5 is inserted into the reinforcing bar 2 of the reinforced concrete column 1, has a male screw 5c at outer periphery, and is provided with a slit in the longitudinal direction 5a and an adhesive pouring inlet 5d in a substantially central part. A pair of diaphragms 8A, 8B provided so as to allow the cylindrical body 5 to pass through are tightened and positioned by a fixing nut 6 on a lower side screw-fitted in the male screw 5c at outer periphery of the cylindrical body 5 and a fixing nut 7 on an upper side.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining apparatus having a pair of diaphragms used for joining a reinforced concrete column and a horizontal steel beam. [0002] For example, when assembling a reinforcing bar of a reinforced concrete column into a bird cage using a round steel bar or a deformed bar bar, the intersection of a vertical main reinforcing bar and a rectangular horizontal bar is wire-bonded. Techniques for fastening are known. [0003] Further, in order to join the reinforced concrete columns assembled in a birdcage shape and the horizontal steel beams, a pair of diaphragms provided with holes for inserting the reinforcing bars at the positions of the reinforcing bars are connected to the horizontal steel beams. There is known a technique in which a nut is tightened from both upper and lower surfaces of a pair of diaphragms to fasten a reinforcing bar and a diaphragm. Various techniques for connecting and fixing rebars to each other are known, but when they are fastened by wire, they are difficult to fix firmly, are easily loosened by movement, etc., and are deformed by concrete casting. There is also a problem that welding of a reinforcing bar having a large carbon equivalent to a plate-shaped body, that is, a steel plate having a low carbon equivalent, which is mild steel, is likely to cause a problem, and it is not preferable to use it at a key point. Further, in order to fasten a diaphragm or the like to a predetermined position of a reinforcing bar with a nut, it is necessary to machine a male screw at a predetermined position of the reinforcing bar, and the thread portion has a small root diameter and a tensile strength due to a notch effect. And the processing is troublesome, resulting in an increase in cost. As is well known, the diaphragm is set on the upper part of the rebar and the lower part is supported by a nut, so it is not easy to raise the thread while rotating the nut by cutting the thread over the entire length of the rebar. It is impractical to form only the reinforcing bar of the supporting portion thick and to thread the portion, since the manufacturing of the reinforcing bar is troublesome. [0006] The present invention has been proposed in view of the above-mentioned problems of the prior art, and facilitates positioning when joining a horizontal steel beam to a diaphragm. Another object of the present invention is to provide a joining device for a pair of diaphragms for joining a reinforced concrete column and a horizontal steel beam that can firmly join the diaphragm to the reinforcing bar without requiring complicated processing for the reinforcing bar for joining the diaphragm. [0007] A joining apparatus having a pair of diaphragms (8A, 8B) for joining a reinforced concrete column (1) and horizontal steel beams (9M, 9N) according to the present invention is a reinforced concrete column. The cylindrical body (5) is inserted into the reinforcing bar (2) of (1), the circular body (5) has an external thread (5c) on the outer periphery, and the slit (5) is formed in the longitudinal direction.
a) is provided, and an adhesive injection port (5b) is provided substantially at the center, and the pair of diaphragms (8A, 8A) provided so as to penetrate the cylindrical body (5).
B) is fastened and fixed by a lower fixing nut (6) and an upper fixing nut (7), which are screwed with the external thread (5c) on the outer periphery of the cylindrical body (5). Therefore, two cylindrical bodies are connected to one reinforcing bar of the required number of reinforcing bars of the reinforced concrete columns through which the pair of diaphragms arranged in parallel are inserted, and the pair of diaphragms join the horizontal beam. It is fixed so as to have a necessary interval, and the lower diaphragm of the pair of diaphragms is inserted from above the required number of rebars, and the lower diaphragm is previously fixed with a lower fixing nut for fixing the lower diaphragm. The diaphragm is kept horizontal, and the lower diaphragm is fixed to the rebar with the upper and lower fixing nuts of the lower diaphragm. Next, a lower nut for fixing the upper diaphragm is screwed beforehand below the male screw of the upper cylindrical body left among the two cylindrical bodies. Thereafter, the upper diaphragm is inserted through the upper end of the reinforcing bar and lowered, and the lower nut is screwed below the remaining male screw of the cylindrical body for fixing the upper diaphragm. Temporarily fix the diaphragm. The following is
Similarly to the lower diaphragm described above, the upper diaphragm is adjusted to an appropriate position for joining the horizontal beam with the upper and lower fixing nuts of the upper diaphragm, and then fixed to the reinforcing bar. [0010] In this way, by fixing the pair of (upper and lower) diaphragms to the reinforcing steel while adjusting the height direction thereof by the circular isoform having male threads and the upper and lower fixing nuts, positioning in the Z direction can be performed, and the reinforced concrete column is provided. , Ie, the positioning in the XY directions, can also be determined by the diaphragm. Therefore, according to the present invention, the positioning of the diaphragm and the joining of the reinforcing bars can be performed simply and accurately by a simple means of inserting a cylindrical body having an external thread into the reinforcing bars. Embodiments of the present invention will be described with reference to the accompanying drawings. FIGS. 1 to 3 show the entire structure of a reinforced concrete column 1 in which horizontal beams are joined according to the present invention. The structure of a diaphragm assembly 80 having a pair of diaphragms, and the structure of the diaphragm assembly 80 is shown in FIG. The mode of joining the horizontal beams 9M and 9N to be joined will be described later. The reinforced concrete column 1 has a plurality of (in the illustrated example, eight) main reinforcing bars 2 which are vertical reinforcing bars, and the main reinforcing bars 2 are provided at positions where the horizontal beams 9M and 9N of the main reinforcing bars 2 are joined.
A pair of upper and lower sheaths (a cylindrical body in the claims; hereinafter, a cylindrical body is referred to as a sheath) 5 is inserted in each of the upper and lower parts. In addition, the code | symbol 3 in a figure shows a horizontal stripe. As shown in FIG. 7, the sheath 5 has an external thread 5c on the outer periphery and a slit 5a in the longitudinal direction.
A plurality of adhesive inlets 5b are perforated at substantially the center in the longitudinal direction, and a plurality of notches 5d are provided in the upper half. Then, as shown in FIG. 8, a sheath 5 is inserted into a predetermined position of each main bar 2, an adhesive is injected downward from an adhesive injection port, and an upper nut previously inserted below the main bar 2 is inserted. 6 are screwed together, each sheath 5 is inserted into a main muscle hole 8a (see FIG. 5) of the diaphragm 8 (the upper diaphragm is 8A, and the lower diaphragm is 8B), and fixed with the upper nut 7. At this time, the vertical position of the diaphragm 8 is fixed with nuts 6 and 7. In this case, even if a deformed reinforcing bar is used as the main bar 2, the sheath 5 can be stabilized by rotating the sheath 5 and changing the position of the slit 5a of the sheath. Although the upper and lower diaphragms are positioned in this manner, the sheath 5 can be easily inserted into the main bar 2 by the slits 5a, and can be sufficiently brought into contact with the main bar 2 by tightening the nuts 6 and 7. In the above, the case where the pair of upper and lower diaphragms 8 (8A, 8B) are joined to the reinforced concrete column has been described. The joining method of the pair of upper and lower diaphragms and the horizontal beam is described with reference to FIGS. The integration of a pair of upper and lower diaphragms as a reinforcing method will be described simultaneously with reference to FIGS. Before description, a pair of upper and lower diaphragms 8
As for A and 8B, the reference numeral 8 is used as a general term, unless the description needs to be divided into upper and lower parts. Further, the same reference numerals are used for the upper and lower diaphragms 8A and 8B as the main muscle holes 8a and the like attached to the upper and lower diaphragms. First, a circular hole 8b is formed at the center in FIG.
A and 8B have trapezoidal projections 8x and 8y on two adjacent sides, and a plurality of squares (in the drawing, parallel to each side of a rectangular base) outside the circular hole 8b are arranged. Eight main muscle holes 8a for insertion of the main muscle are drilled. The pair of upper and lower diaphragms 8A and 8B
As shown in FIG. 4 (or FIG. 6), the distance between each other is adjusted to a regular position (for example, each horizontal beam 9M, 9N is joined to the protruding portions 8x, 8y by a method described later). Later, the reinforcing webs 80D and 80E are integrated as a diaphragm assembly indicated by reference numeral 80 by, for example, welding. Alternatively, the pair of diaphragms 8A, 8B can be fixed directly to the main bar 2 at regular positions by the nuts 6, 7, and the reinforcing webs 80D, 80E can be omitted. The thickness of the reinforcing webs 80D and 80E is the same as that of the horizontal beams 9M and 9N described later. Here, the positional relationship of the reinforcing web 80D with respect to the protruding portion 8x is such that the center of the plate width of the reinforcing web 80D is located at the center in the width direction of the protruding portion 8x.
At the position retracted by a distance L from the tip of
There is one tip of D. The reinforcing web 80
The positional relationship of E with respect to the protrusion 8y is such that the center of the plate width of the reinforcing web 80E is located at the center of the protrusion 8y in the width direction,
The tip of the reinforcing web 80E coincides with the tip of the protrusion 8y. Horizontal steel beam diaphragm 8 (8A, 8A)
One example of a joining method to B) is a method performed with the protruding portion 8x (the horizontal beam at this time is 9M), and as recognized in FIG. 1, a horizontal beam 9M (using an H-section steel) So that the outer surfaces of the upper and lower flanges are sandwiched between the inner surfaces of the diaphragms 8 (8A, 8B), and the end surfaces of the webs of the horizontal beams 9M abut the end surfaces of the reinforcing webs 80D.
And two connecting plates 10 extending from both sides of the web of the horizontal beam 9M to both sides of the reinforcing web 80D.
It is joined by, for example, a one-side shear high-strength bolt 13 or a rivet so as to be sandwiched by M. The horizontal steel beam diaphragm 8 (8A, 8A)
Another example of the joining method to B) is the one performed with the protruding portion 8y (the horizontal beam at this time is assumed to be 9N), and as seen in FIG. ) And the tip of the protrusion including the reinforcing web 80E have the same cross-sectional shape and are brought into contact with each other so that their cross-sections coincide with each other. 2
The first joint plate 11N is held between the first joint plate 11N and the same position as the first joint plate 11N in the longitudinal direction of the horizontal beam 9N on the back surface of the flange 9Na.
Apply 2N (there are 4). Also, after both the reinforcing web 80E and the web 9Nb of the horizontal beam 9N are provided with two third joint plates, each flange (projection), each web, and each joint plate are joined by bolts 13. I have. As described above, according to this embodiment, the joint between the reinforcing bar and the diaphragm can be accurately positioned.
Diaphragms and horizontal steel beams can also be joined in the correct dimensions and locations. When the projection 8x is provided, the web 80D can be omitted. As described above, according to the present invention, the following excellent effects can be obtained. (A) Since the male screw portion can be easily provided at a key position of the reinforcing bar without reducing the cross-sectional area, the positioning of the diaphragm can be easily performed by the nut, and the strength does not decrease. (B) Cylindrical bodies and nuts at key points can be mass-produced in factories as general-purpose products, and can be fixed with an adhesive at the construction site. To contribute. (C) Suitable for buildings of middle-rise or higher, because it can firmly join the reinforcing bars and horizontal steel beams at the correct positions and dimensions.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall configuration diagram of a joint in one embodiment of the present invention. FIG. 2 is a sectional view taken along the line ZZ of FIG. FIG. 3 is a view in the direction of the arrow X in FIG. 1; FIG. 4 is a front view of the diaphragm assembly according to the embodiment of the present invention. FIG. 5 is a sectional view taken along the line ZZ of FIG. 4; FIG. 6 is a view as seen in the direction of the arrow X in FIG. 4; FIG. 7 is a partial sectional view showing a sheath. FIG. 8 is a side view showing a joint between the reinforcing bar and the diaphragm. [Brief description of reference numerals] 1 ... Reinforced concrete column 2 ... Main bar 3 ... Horizontal bar 5 ... Sheath 6, 7 ... Nut 8 ... Diaphragm 8A ... Upper diaphragm 8B ... Lower diaphragm 80: diaphragm assembly 9M, 9N: horizontal beam

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Naoki Tanaka             2-23-9-2 Seigaoka, Tama-shi, Tokyo F term (reference) 2E125 AA04 AA14 AB01 AB12 AC01                       AC15 AG48

Claims (1)

Claims: 1. A joining device having a pair of diaphragms used for joining a reinforced concrete column and a horizontal steel beam, wherein a cylindrical body is inserted into a reinforcing bar of the reinforced concrete column. The circular body has an external thread on the outer circumference, is provided with a slit in the longitudinal direction, is provided with an adhesive injection port substantially in the center, and is provided so that the cylindrical body can be penetrated. A reinforced concrete column and a horizontal steel beam, wherein the pair of diaphragms are fastened and positioned by a lower fixing nut and an upper fixing nut screwed with a male screw on the outer periphery of the cylindrical body. A joining device having a pair of diaphragms to be joined.