JPH0913583A - Bar arrangement structure for double-level beam and bar arranging method therefor - Google Patents

Abstract

PURPOSE: To simplify bar arranging works by installing a bent lower-beam lower-end main reinforcement and a stirrup to the lower section of a lower beam, mounting an upper-beam upper-end main reinforcement and a cap-tie to the upper section of an upper beam and connecting the end section of the upper beam to the lower beam. CONSTITUTION: A lower-beam lower-end main reinforcement 14 is disposed to a lower beam 12, and stirrups 15 are connected to the lower-beam lower-end main reinforcement 14 and upper end sections are projected to sections upper than connecting surfaces. An upper-beam upper-end main reinforcement 16 is arranged into an upper beam 11, and a lower-beam upper-end main reinforcement 18 and an upper-beam lower-end main reinforcement 19 are disposed to the upper section of the lower beam 12 and the lower section of the upper beam 11. A splicing bar 20 is arranged and joined between the lower-beam upper-end main reinforcement 18 and the upper-beam lower-end main reinforcement 19, and vertical reinforcements 21, 22 are disposed to each bent section 14a, 16a of the lower-beam lower-end main reinforcement 14 and the upper- beam upper-end main reinforcement 16. Accordingly, bar arrangement structure in connecting sections is simplified, and stress working between the upper beam and the lower beam can be transmitted surely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing bar structure and a reinforcing bar method in a joint part of a stepped beam in which a lower end part of an upper beam is connected to an upper surface of an end part of a lower beam.

[0002]

2. Description of the Related Art In a structure for an apartment house such as a condominium, a beam to be bridged between adjacent columns and joined is a forward beam frame structure in which a beam portion projects downward from a floor slab surface. is there. By the way, when this forward beam frame is used on the balcony side of the living room, the beam protrudes downward from the ceiling surface, so the position of the window frame facing the balcony must be set low by this beam, There was a problem that the view from the window was narrowed.

As a means for solving this, conventionally, as shown in FIGS. 3 (a) and 3 (b), a part of a beam 52 erected between columns 51 on the balcony 50 side is replaced with a reverse beam erection. There is a cross-beam. That is, the portion of the beam 52 where the window frame 53 is disposed is projected as the upper beam 52a onto the upper surface of the floor slab 54, and the entrance 5 leading to the balcony 50 is connected.
5 is a floor slab 54 where the lower beam 52b is provided.
It is installed in the lower part of.

According to this structure, by disposing the window frame 53 in the portion of the reverse beam frame, the position of the window frame 53 can be set higher by the height of the beam 52, and the view from the window can be improved. Has the advantage of being widely available. Further, if the entrance / exit 55 is provided in the part of the forward beam frame, the beam 52 does not project from the upper surface of the floor slab 54, so that there is no step in the entrance / exit 55.

[0005]

However, the stepped beam has a problem in that the bar arrangement at the joint 56 is complicated, as shown in FIG. 4 (a). That is, in this stepped beam, the beams 52a and 52b that are vertically overlapped with each other are provided.
Stress must be transmitted between them, and the bond strength at such bond 56 must be increased to withstand this. Therefore, the beam main bar 57 of the upper beam 52a,
58 is bent downward and is disposed between the upper beam 52a and the lower beam 52b, and the lower beam 60 is disposed.
After that, a method of arranging the shear reinforcing bars 61 so as to surround the outer peripheries of the beam main bars 57 to 60 has been adopted.

However, the beam main bars 57, 5 of the upper beam 52a
8 and the beam main bars 59 and 60 of the lower beam 52b are arranged in the vertical direction and arranged in the same vertical plane, another beam main bar becomes an obstacle and the beam main bar is moved from the upper beam 52a to the lower beam. 5
It becomes difficult to reach 2b. Therefore, in the conventional case, as shown in FIG.
In order to prevent 7, 58, 59, 60 from being arranged in the same vertical plane, the arrangement positions of the upper and lower main bars are horizontally shifted. Therefore, there has been a problem in that the stress calculation for arranging the main bars of each beam in the horizontal direction and arranging the bars and the interaction with other reinforcing bars must be taken into consideration, and the bar arrangement becomes complicated.

Further, since the conventional bar arrangement is complicated as described above, there is a problem that the construction work is complicated. That is, the upper beam 52a and the lower beam 52b
Since the beam main bars 57, 58, 60 of both of the above are arranged by shifting in the horizontal direction as described above, and are further bent downward, after these are arranged, the inside of the joint 56 is The space was closed, which made it difficult to weld the reinforcing bar inside. Further, in order to arrange the shear reinforcement bars 61, these beam main bars 57 to 6 are arranged.
After arranging 0, it is necessary to arrange the wires by winding them around these outer circumferences, and it is difficult to secure a space for performing the work in the joint portion 56, and the work is complicated. Was becoming.

The present invention has been made in order to solve the above problems, and has a simple structure for the bar arrangement of the stepped beams, which facilitates the bar designing and construction work. An object of the present invention is to provide a structure and a reinforcing method thereof.

[0009]

In order to achieve the above object, the stirrup beam arranging structure of the present invention is a joint part of a stepped beam in which the upper end portion of the lower beam is joined to the lower end portion of the upper beam. A lower beam which is arranged in the lower part of the lower beam along the longitudinal direction of the lower beam and is bent upward so that its end does not project above the joining surface. The lower end main bar and the lower beam main bar are orthogonal to each other,
A plurality of U-shaped ribs arranged so that their upper ends project above the joint surface, and a plurality of U-shaped ribs arranged along the longitudinal direction of the upper beam above the joint surface and more than the joint surface. The upper beam top main bar that is bent downward so that its end does not project downward, and the upper beam upper bar and the lower beam upper part and the lower part of the upper beam, which are arranged along these longitudinal directions and are substantially the same in joint surface The lower beam upper end main bar and the upper beam lower end main bar which are arranged in the level direction, the supplementary bar which is arranged so as to straddle the lower beam upper end main bar and the upper beam lower end main bar, and the lower beam lower end main bar and the upper beam Consists of a substantially L-shaped vertical bar that is attached to each bent portion of the beam upper main bar and that is arranged between the lower beam and the upper beam, and a cap tie that is attached to each of the upper parts of the ribs. It is what is done.

Further, the reinforcing beam method of the stepped beam according to the present invention is a reinforcing bar method at the joint part of the stepped beam in which the upper end part of the lower beam is joined to the lower end part of the upper beam. Also, a plurality of lower beam lower end main bars bent upward so that the ends do not project upward are arranged along the longitudinal direction of the lower beam lower bar main bars, and U-shaped ribs are formed. , A step of disposing a plurality of the upper end portions projecting above the joining surface and being orthogonal to the lower beam lower main bars,
A plurality of upper beam upper end main bars bent downward so that the ends thereof do not project below the joining surface are arranged on the upper part of the upper beam along the longitudinal direction thereof, and
A step of arranging a lower beam upper end main bar and an upper beam lower end main bar along the longitudinal direction of the upper part of the lower beam and the lower part of the upper beam so as to face each other at substantially the same level on the joint surface; A step of disposing a reinforcing bar so as to straddle the upper beam lower end main bar, and across the lower beam and the upper beam,
Approximately L is attached to each bent part of the lower beam lower main reinforcement and the upper beam upper main reinforcement.
The process consists of attaching a vertical bar and attaching cap ties to the upper parts of the ribs.

[0011]

According to the reinforcing structure and the reinforcing method of the stepped beam according to the present invention having the above-mentioned structure, the lower beam lower end main bar and the upper beam upper end main bar arranged at the lower part of the lower beam and the upper part of the upper beam, The ends are bent from one beam to the other so that they do not project through the joint surface, so these ends should hit the upper beam lower end bar and the lower beam upper end bar near the joint surface. There is no. Therefore, these main bars can be arranged in the same vertical plane, and the bar arrangement structure at the joint can be simplified.

Further, since the ribs and the longitudinal ribs are arranged between the upper beam and the lower beam, it is possible to effectively resist the shear stress generated between the upper beam and the lower beam.
Further, since the reinforcing bar is arranged so as to straddle the lower beam upper end main bar and the upper beam lower end main bar, it is possible to ensure the transmission of the stress acting between the upper beam and the lower beam.

Further, the ribs arranged on the lower beam are U-shaped, and after the ribs are arranged on the lower end main bar of the lower beam, the ribs are arranged at the bottom main bar of the lower beam in order to carry out the reinforcement work of the vertical bar and the cap tie at the end. Even if it is, other reinforcement work can be performed with the upper part of the joint open, and when performing the work such as the reinforcement of the lower beam upper end main bar and the upper beam lower end main bar, and the joining of splicing bars after that. It is possible to secure a space for these operations and to facilitate such operations.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a reinforcing structure and a reinforcing method of a stepped beam according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 and FIG. 2 show a situation in which the staircase beam reinforcing structure 30 according to the present embodiment is adopted for the staircase beam 10.

The stepped beam 10 is formed by joining the lower end of the upper beam 11 to the upper surface of the end of the lower beam 12. That is, for example, a portion of a residential structure such as an apartment that is erected between the pillars on the balcony side and the window frame of the stepped beam 10 is projected as an upper beam 11 onto the upper surface of the floor slab 1 and leads to the balcony. The portion where the entrance and exit is provided is provided below the floor slab 1 as the lower beam 12.

A plurality of bar arrangement structures 30 in the joint portion 13 of the stepped beam 10 are arranged on the lower beam lower end main bar 14 and a plurality of lower beam lower end main bars 14. U-shaped ribs 15, a plurality of upper beam upper main bars 16 arranged above the upper beam 11, and a lower beam 12.
Lower beam upper end main bar 18 and upper beam lower end main bar 19 disposed along the longitudinal direction above the upper part and lower part of the upper beam 11, these lower beam upper end main bar 18 and upper beam lower end main bar 1
9 and the bent portion 14a of the lower beam lower end main bar 14 and the upper beam upper end main bar 16
The vertical ridges 21 and 22 are attached to 16a, and the cap ties 17 are attached to the upper portions of the ribs 15, respectively.

In this embodiment, the reinforcement work of the reinforcement structure 30 of the stepped beams is performed in the concrete form 40 installed between the pillars on the balcony side of the structure. As this concrete formwork, an ordinary concrete formwork or a PC formwork made of precast concrete can be used.

A plurality of the lower beam lower main bars 14 are arranged in parallel along the longitudinal direction of the lower beam, and the ends facing the joints 13 are the ends of the joints 13.
It is bent upward so that its end does not project above the joining surface (for example, the upper surface of the floor slab 1).

The ribs 15 are shear reinforcing bars arranged in a plurality orthogonal to the lower beam lower main bars 14 and are joined to the lower beam lower main bars 14 by welding or the like. In addition, the ribs 15 are arranged so as to surround the lower beam lower main bars 14 arranged in parallel from below, and the upper ends of the bent ribs 15 are located above the upper surface of the floor slab 1. Is also set to project upward.

The upper beam upper end main bars 16 are arranged in parallel along the longitudinal direction of the upper beam 11, and are arranged vertically in the same vertical plane as the lower beam lower end bar 14 respectively. It is something. In addition, the upper beam upper end main bar 16 is bent downward so that the end portion facing the joint portion 13 does not protrude below the joint surface (for example, the lower surface of the floor slab 1).

Lower beam upper end main bar 18 and upper beam lower end main bar 1
A plurality of 9 are arranged on the upper part of the lower beam 12 and the lower part of the upper beam 11 in parallel along these longitudinal directions,
The lower beam lower end main bar 14 and the upper beam upper end main bar 1 respectively
6 are arranged in the same vertical plane. The lower beam upper end main bar 18 and the upper beam lower end main bar 19 are arranged within the member thickness of the floor slab 1 in this embodiment, and are arranged so as to face each other at substantially the same level within this member thickness. There is.

The reinforcing bar 20 is arranged so as to straddle between the lower beam upper end main bar 18 and the upper beam lower end main bar 19 and along these main bars. In this embodiment, the reinforcing bar 20 is made of normal reinforcing bar, and the lower beam upper end main bar 18
And the lower beam main bar 19 of the upper beam by lap joints or welding.

The vertical bars 21 and 22 are auxiliary reinforcing bars that are bent into a substantially L shape. The vertical bars 21 are in the bent portions 14a of the lower beam lower main bars 14 and the vertical bars 22 are in the upper beam upper main bars 16. It is attached by welding or the like along with the bent portion 16a.
Then, the vertical portions 21a, 22 of these vertical stripes 21, 22
The length a is set to be substantially equal to the height of the joint portion 13 so as to be arranged between the lower beam 12 and the upper beam 11.

The cap ties 17 are attached to the respective upper portions of the ribs 15 so as to collectively enclose the upper beam upper end main bars 16 arranged in parallel from above.
Its shape is an inverted U-shape, and its lower end is bent like a key.

Then, the reinforcing bar structure 30 of the stepped beam having such a structure is joined to the joint portion 1 of the stepped beam 10 by the following procedure.
Arranged to 3. First, the lower beam 12 is attached to the lower beam main reinforcement 1
4 is provided. At this time, the end portion of the bent portion 14a is arranged so as to face the member thickness of the floor slab 1 so that the bent portion 14a does not project beyond the upper surface of the floor slab 1. In addition, it is preferable to perform the work of joining the ribs 15 to the lower beam main reinforcement 14 of the lower beam in parallel with this work.

Next, in the upper beam 11, the upper beam upper main bar 1
6 is arranged. That is, the bent portion 16 a is arranged downward so that the lower end portion of the bent portion 16 a of the upper beam upper main bar 16 does not project downward from the lower surface of the floor slab 1. In parallel with the work of arranging the upper beam upper end main bar 16, the lower beam upper end main bar 18 and the upper beam lower end main bar 19 are arranged on the upper part of the lower beam 12 and the lower part of the upper beam 11. The arrangement of the lower beam upper end main bar 18 and the upper beam lower end main bar 19 can be performed, for example, by sending them out from the upper beam 11 and the lower beam 12 and inserting the ends thereof into the joint portion 13. .

Further, when the lower beam upper end main bar 18 and the upper beam lower end main bar 19 are arranged, the lower beam upper end main bar 18
The reinforcing bar 20 is arranged so as to straddle between the upper beam lower end main bar 19 and the upper beam. The braces 20 are arranged, for example, in the upper beam 1
Sending the reinforcement 20 from 1 to reach the inside of the joint 13,
In that state, it can be joined to the lower beam upper end main bar 18 and the upper beam lower end main bar 19 by welding or binding.

After the above work is completed, each bent portion 14 of the lower beam lower end main bar 14 and the upper beam upper end main bar 16 is next.
The vertical stripes 21 and 22 are arranged on a and 16a, and the cap ties 17 are attached to the upper portions of the ribs 15 to complete the work.

According to such a stair beam reinforcing structure 30 and its reinforcing method, the lower beam lower end main bar 14 and the upper beam upper end main bar 16 do not project from the upper surface or the lower surface of the floor slab 1 at their end portions. Is bent, the ends of the bent portions 14a and 16a do not hit the upper beam lower end main bar 19 and the lower beam upper end main bar 18 arranged in the floor slab 1.

Furthermore, the ribs 15 and the longitudinal ribs 21, 22 are
Since it is disposed between the upper beam 11 and the lower beam 12, it is possible to effectively resist the shear stress generated between the upper beam 11 and the lower beam 12. In addition, braces 2
Since 0 is arranged along the lower beam upper end main bar 18 and the upper beam lower end main bar 19, the transmission of the axial force acting between these main bars 18, 19 can be ensured.

Further, the ribs 15 are U-shaped, and since the ribs 15 and 22 and the cap tie 17 are arranged lastly, even after the ribs 15 are arranged,
Other reinforcement work can be performed with the upper portion of the joint 13 open.

[0032]

As described above in detail in the embodiments,
According to the reinforcing structure and the reinforcing method of the stepped beam of the present invention, the lower beam lower end main bar and the upper beam upper end main bar arranged on the lower part of the lower beam and the upper part of the upper beam are arranged from one beam to the other beam. Since the ends thereof are bent so as not to project through the joint surface, these ends do not hit the upper beam lower end main bar and the lower beam upper end main bar in the vicinity of the joint surface. Therefore, these main bars can be arranged in the same vertical plane, and the bar arrangement structure at the joint can be simplified.

Further, since the ribs and the longitudinal ribs are arranged between the upper beam and the lower beam, it is possible to effectively resist the shear stress generated between the upper beam and the lower beam. . Further, since the reinforcing bar is arranged so as to straddle the lower beam upper end main bar and the upper beam lower end main bar, it is possible to ensure the transmission of the stress acting between the upper beam and the lower beam.

The ribs arranged on the lower beam are U-shaped, and after the ribs are arranged on the lower-column main bars of the lower beam, the last reinforcement of the vertical bar and the cap tie is performed. Even in this case, other reinforcement work can be performed with the upper portion of the joint open, and this reinforcement work can be facilitated.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a reinforcing bar structure of a stepped beam according to the present invention.

FIG. 2 is an explanatory view showing a reinforcing bar structure of a stepped beam and a reinforcing bar method according to the present invention.

3A and 3B are explanatory views showing a reinforcing bar structure of a conventional stepped beam, FIG. 3A is a perspective view showing the stepped beam, and FIG. 3B is a front view showing a part of the beam.

4A and 4B are explanatory views showing a reinforcing bar structure of a conventional stair beam, FIG. 4A is a sectional view showing the reinforcing bar structure, and FIG. 4B is a sectional view taken along line AA of FIG. 4A.

[Explanation of symbols]

 10 step beam 11 upper beam 12 lower beam 14 lower beam lower main bar 15 ribs 16 upper beam upper bar 17 cap tie 18 lower beam upper bar 19 upper beam lower bar 20 supplementary bar 21 and 22 vertical bar 30 reinforcing structure

Claims (2)

[Claims] 1. A bar arrangement structure in a joint portion of a stepped beam in which a lower end portion of an upper beam is joined to an upper surface of an end portion of a lower beam, and a plurality of reinforcing members are arranged in a lower portion of the lower beam along a longitudinal direction thereof. A lower beam lower end main bar that is mainly arranged and is bent upward so that its end does not project above the joining surface, and an upper end part of the lower beam lower end main bar that is orthogonal to the lower beam lower end main bar. A plurality of U-shaped ribs arranged so as to project above the surface, and a plurality of ribs arranged along the longitudinal direction of the upper beam above the upper beam, and below the joint surface. An upper beam upper end main bar that is bent downward so that the end does not project, and an upper beam upper bar and an upper beam lower bar that are arranged along the longitudinal direction of the upper beam and the lower beam, and have substantially the same level on the joint surface. And the upper beam lower end main bar and the upper beam lower end main bar Reinforcing bars arranged so as to straddle between the lower beam upper end main bar and the upper beam lower end main bar, and attached to each bent portion of the lower beam lower end main bar and the upper beam upper end main bar, and Reinforcing structure of a stepped beam, characterized by comprising a substantially L-shaped vertical streak disposed between a beam and the upper beam, and a cap tie attached to an upper part of the rib. . 2. A bar arrangement method in a joint portion of a stepped beam, which is formed by joining a lower end portion of an upper beam to an upper surface of an end portion of a lower beam, wherein the end portion does not project above the joint surface. A plurality of lower beam lower end main bars bent upward as described above are arranged in the lower part of the lower beam along the longitudinal direction of the lower beam, and U-shaped ribs are formed so that the upper ends thereof are more than the joint surface. A plurality of them so that they also project upward and are orthogonal to the lower beam lower main bars, and an upper beam that is bent downward so that its ends do not project below the joining surface. A plurality of upper end main bars are arranged on the upper portion of the upper beam along the longitudinal direction thereof, and are arranged on the upper portion of the lower beam and the lower portion of the upper beam along the longitudinal direction and at the joint surface. The upper and lower main bars of the lower beam so that they face each other at the same level Arranging a lower beam main bar of the square beam, arranging a reinforcing bar so as to straddle the lower beam upper bar and the upper beam lower bar, and crossing between the lower beam and the upper beam. A substantially L-shaped vertical bar is attached to each bent portion of the lower beam lower end main bar and the upper beam upper end main bar, and a cap tie is attached to the upper part of the rib. The method of arranging uneven beams.