JP3089991B2 - Reinforcement assembly of uneven beam and method of arranging the reinforcement - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing bar assembly at a joint of a stepped beam formed by joining a lower end of an upper beam to an upper surface of an end of a lower beam and a method of arranging the reinforcing bar.

[0002]

2. Description of the Related Art In a structure for condominiums such as condominiums, as a beam spanned and joined between adjacent columns, a forward beam frame having a beam portion projecting downward from a floor slab surface is formed. is there. By the way, when this forward beam frame is used on the balcony side of the living room, since the beams protrude downward from the ceiling surface, the position of the window frame facing the balcony must be set lower by the amount of 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 the columns 51, 51 on the balcony 50 side is formed as a reverse beam erection. There are uneven beams. That is, the portion of the beam 52 where the window frame 53 is disposed is projected as an upper beam 52 a on the upper surface of the floor slab 54 and the entrance 5
The floor slab 54 is used as the lower beam 52b where the portion 5 is disposed.
It is arranged at the lower part of.

According to this structure, by disposing the window frame 53 in the inverted beam frame, the position of the window frame 53 can be set higher by the height of the beam 52, and the field of view from the window can be set. Has the advantage of being widely available. In addition, if the entrance 55 is provided in a portion where the forward beam frame is provided, the beam 52 does not protrude from the upper surface of the floor slab 54, so that there is no step in the entrance 55.

[0005]

However, the stepped beam has a problem that the arrangement of the reinforcing bars at the joint 56 becomes complicated, as shown in FIG. That is, in this uneven beam, the beams 52a and 52b which are
The stress must be transferred between them, and the joint strength at such joint 56 must be increased to withstand this. Therefore, the beam main bar 57 of the upper beam 52a,
58 is bent downward, and disposed between the upper beam 52a and the lower beam 52b, and the lower beam 60 is disposed,
Thereafter, a method of arranging the shear reinforcing bars 61 so as to surround the outer periphery of the beam main bars 57 to 60 has been adopted.

However, main beam bars 57, 5 of the upper beam 52a are provided.
When the beam main reinforcements 59 and 60 of the lower beam 8 and the lower beam 52b are arranged in the vertical direction and are arranged in the same vertical plane, the other beam main reinforcement becomes an obstacle, and the beam main reinforcement is moved from the upper beam 52a to the lower beam 52a. 5
It is difficult to reach 2b. Therefore, conventionally, as shown in FIG.
The arrangement positions of the upper and lower main bars are shifted in the horizontal direction so that the bars 7, 58, 59, and 60 are not arranged in the same vertical plane. Therefore, it is necessary to consider stress calculation for arranging the beam main reinforcing bars in the horizontal direction and arrangement with other reinforcing bars, and there is a problem that the reinforcing bar design becomes complicated.

[0007] Further, the conventional reinforcing arrangement has a complicated arrangement, as described above. That is, the upper beam 52a and the lower beam 52b
Since the beam main reinforcing bars 57, 58, and 60 are arranged so as to be shifted in the horizontal direction as described above and are bent downward, after these are arranged, the inside of the joint portion 56 This space has been closed, making it difficult to weld reinforcing bars inside the space. In order to arrange the shear reinforcing bars 61, these beam main bars 57 to 6 are used.
After arranging the reinforcements, it is necessary to arrange the reinforcements so as to be wound around these outer circumferences, and it is difficult to secure a space for performing the operation in the joint portion 56, and the operation is complicated. Had become.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and has a simple structure for reinforcing bars in a stepped beam, and a reinforcing bar set of the stepped beam capable of facilitating the design and construction work of the stepped beam. It is an object to provide a three-dimensional structure and a method of arranging the three-dimensional structure .

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, a stepped beam reinforcing bar assembly according to the present invention comprises a stepped beam joining portion formed by joining an upper end of a lower beam to a lower end of an upper beam. a reinforcing bar assembly in, are a plurality of arranged along the bottom to the longitudinal direction of the lower beam, and the lower beam to which the end portion is bent upward so as not to protrude above the junction surface A lower main bar, a plurality of U-shaped ribs arranged perpendicular to the lower beam lower main bar such that the upper end protrudes above the joint surface, and a longitudinal direction of Are provided along the upper beam, and the upper beam upper main bar bent downward so that the end does not protrude below the joining surface, and the upper beam lower portion and the upper beam lower portion, Arranged along the longitudinal direction and oriented at approximately the same level at the joint surface The lower beam upper main bar and the upper beam lower main bar to be provided, the auxiliary bar arranged so as to straddle between the lower beam upper main bar and the upper beam lower main bar, and the lower beam lower main bar and the upper beam upper main bar. It is composed of a substantially L-shaped vertical streak attached to each bent portion and disposed between the lower beam and the upper beam, and cap ties attached to the upper portions of the ribs, respectively. is there.

[0010] The reinforcing method for a stepped beam according to the present invention is a method for arranging a stepped beam at a joint of a stepped beam formed by joining a lower end of an upper beam to an upper surface of an end of a lower beam. A plurality of lower reinforcements at the lower end of the lower beam bent upward so that the ends do not protrude, and a plurality of U-shaped ribs are arranged below the lower beam along the longitudinal direction thereof. A step of arranging a plurality of the upper beams so as to protrude above the joint surface and perpendicular to the lower beam lower main bar,
Below the joining surface, a plurality of upper beam upper main bars bent downward so that the ends do not protrude are provided along the longitudinal direction of the upper beam at the upper portion of the upper beam,
Disposing a lower beam upper main bar and an upper beam lower main bar so as to face each other at the upper side of the lower beam and the lower portion of the upper beam along the longitudinal direction thereof and at substantially the same level at the joint surface; A step of arranging the reinforcing bar so as to straddle between the upper beam lower main bar and the lower beam and the upper beam,
Approximately L is applied to each bent part of the lower beam lower main bar and the upper beam upper bar.
And a step of attaching cap ties to the upper part of the ribs, respectively.

[0011]

According to the above construction, the reinforcing bar assembly of the stepped beam of the present invention is constructed.
According to the body and the method of arranging the lower beam, the lower main bar of the lower beam and the upper main bar of the upper beam provided at the lower portion of the lower beam and the upper portion of the upper beam extend from one beam to the other beam via the joint surface. Since the ends are bent so as not to protrude, these ends do not hit the upper beam lower main bar and the lower beam upper main bar near the joint surface. Therefore, these main reinforcements can be arranged in the same vertical plane, and the reinforcement arrangement structure at the joint can be simplified.

Further, since the ribs and the longitudinal bars are disposed between the upper beam and the lower beam, they can effectively resist the shear stress generated between the upper beam and the lower beam.
In addition, since the supporting bars are provided so as to extend between the lower beam upper main bar and the upper beam lower bar, transmission of stress acting between the upper beam and the lower beam can be ensured.

The ribs arranged on the lower beam have a U-shape, and the ribs are arranged on the lower main bar at the lower end of the lower beam in order to perform the arrangement of the vertical bars and the cap ties last. Even if it is, it is possible to perform other rebar arrangement work with the upper part of the joint open, and to perform the subsequent rebar arrangement of the lower beam upper main bar and the upper beam lower main bar, the joining of the auxiliary bar, etc. Thus, a space for these operations can be secured, and such operations can be facilitated.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a reinforcing bar assembly for a stepped beam according to the present invention; FIGS. 1 and 2 show a reinforcing bar assembly of a stepped beam according to the present embodiment.
This shows a situation in which the three-dimensional body 30 is employed for the stepped beam 10.

The stepped beam 10 is formed by joining the lower part of the end of the upper beam 11 to the upper surface of the end of the lower beam 12. That is, for example, the portion where the window frame of the uneven beam 10 is provided between the columns on the balcony side of a residential structure such as an apartment building is projected as the upper beam 11 on the upper surface of the floor slab 1 and leads to the balcony. The portion where the doorway is provided is disposed below the floor slab 1 as a lower beam 12.

The reinforcing bars 30 at the joint 13 of the stepped beam 10 are provided in plural at the lower part of the lower beam 12 and at the lower part 14 of the lower beam. U-shaped rib 15, upper plurality of upper beam upper main bars 16 disposed above the upper beam 11, and lower beam 1
The lower beam upper main bar 18 and the upper beam lower main bar 19 arranged along the longitudinal direction of the upper beam 2 and the lower portion of the upper beam 11, and straddle the lower beam upper main bar 18 and the upper beam lower main bar 19. And the bent portions 14 of the lower beam lower main bar 14 and the upper beam upper main bar 16
a and 16a, and a cap tie 17 attached to the upper portion of the ribs 15 respectively.

In this embodiment, the rebar assembly of the stepped beam is performed.
The work of arranging the bars of the body 30 is performed in the concrete formwork 40 installed between the columns on the balcony side of the structure. As the concrete form, a normal concrete form or a PC form formed of precast concrete can be used.

The lower beam lower main reinforcing bars 14 are arranged in parallel along the longitudinal direction of the lower beam, and the end of the lower beam facing the joint 13 is formed at the end of the joint 13.
It is bent upward so that its end does not protrude above the joint surface (for example, the upper surface of the floor slab 1).

The ribs 15 are a plurality of shear reinforcing bars arranged perpendicular to the lower beam lower main bar 14 and are joined to the lower beam lower bar main bar 14 by, for example, welding. The ribs 15 are arranged so as to surround a plurality of lower beam lower main bars 14 arranged in parallel from below, and the upper ends of the bent ribs 15 are higher than the upper surface of the floor slab 1. Are also set to protrude upward.

A plurality of upper beam upper main bars 16 are disposed in parallel along the longitudinal direction of the upper beam 11, and are disposed vertically in the same vertical plane as the lower beam lower main bars 14, respectively. Things. The upper beam upper main reinforcement 16 is bent downward so that the end facing the joint 13 does not project below the joint surface (for example, the lower surface of the floor slab 1).

Lower beam upper main bar 18 and upper beam lower main bar 1
Reference numeral 9 denotes a plurality of members 9 arranged in parallel on an upper portion of the lower beam 12 and a lower portion of the upper beam 11 along their longitudinal directions.
The lower beam lower main bar 14 and the upper beam upper bar 1 respectively.
6 are arranged in the same vertical plane. In the present embodiment, the lower beam upper main bar 18 and the upper beam lower main bar 19 are arranged within the member thickness of the floor slab 1 and are arranged so as to face each other at substantially the same level within this member thickness. I have.

The reinforcing bar 20 is arranged so as to straddle the lower beam upper main bar 18 and the upper beam lower main bar 19 and to extend along these main bars. In the present embodiment, a normal reinforcing bar is used for the reinforcing bar 20, and the lower beam upper main bar 18 is used in this embodiment.
And it is joined to the upper beam lower main bar 19 by a lap joint or welding.

The vertical bars 21, 22 are auxiliary reinforcing bars which are bent to form a substantially L-shape. The vertical bars 21 are provided at the bent portions 14a of the lower main bar 14 at the lower end of the beam, and the vertical bars 22 are provided at the upper main bar 16 at the upper beam. It is attached by welding or the like along the bent portion 16a.
And 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 13 so as to be disposed between the lower beam 12 and the upper beam 11.

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

Further, the reinforcing bar of the stepped beam having such a configuration is provided.
The assembly 30 is arranged on the joint 13 of the stepped beam 10 in the following procedure. First, the lower beam lower main bar 14 is disposed on the lower beam 12. At this time, rather than the upper surface of the floor slab 1,
The end portion of the bent portion 14a is arranged so as to face within the thickness of the floor slab 1 so that the bent portion 14a does not project. In parallel with this operation, it is preferable to perform an operation of joining the ribs 15 to the lower main bar 14 at the lower end of the beam.

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

In arranging the lower beam upper main bar 18 and the upper beam lower main bar 19, the lower beam upper main bar 18
An auxiliary bar 20 is provided so as to extend between the upper beam lower main bar 19 and the upper beam lower main bar 19. The arrangement of the attachment 20 is, for example, the upper beam 1
The splice 20 is sent out from 1 to reach the joint 13,
In this state, the lower beam upper main bar 18 and the upper beam lower main bar 19 can be joined by welding or binding.

When the above operation is completed, the bent portions 14 of the lower beam lower main bar 14 and the upper beam upper main bar 16 are then formed.
The work is completed by arranging the vertical streaks 21 and 22 on the a and 16a, and attaching the cap ties 17 on the upper portions of the ribs 15 respectively.

According to such a stepped beam reinforcing bar assembly 30 and the method of arranging the bars , the lower beam lower main bar 14 and the upper beam upper main bar 16 have their end portions so as not to protrude from the upper or lower surface of the floor slab 1. Are bent, so that the ends of the bent portions 14a, 16a are connected to the upper beam lower main bar 19 and the lower beam upper main bar 18 disposed in the floor slab 1.
Never hit.

Further, the ribs 15 and the longitudinal muscles 21 and 22
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, attachment 2
Since 0 is disposed along the lower main bar 18 and the lower main bar 19, the transmission of the axial force acting between the main bars 18, 19 can be ensured.

The ribs 15 have a U-shape, and even after the ribs 15 have been arranged in order to finally perform the work of arranging the vertical bars 21 and 22 and the cap tie 17.
Other reinforcing work can be performed with the upper part of the joint 13 opened.

[0032]

As described above in detail in the embodiments,
ADVANTAGE OF THE INVENTION According to the rebar assembly of the uneven beam of this invention, and the arrangement method thereof, the lower main bar of the lower beam and the upper main bar of the upper beam which are arrange | positioned at the lower part of a lower beam and the upper part of an upper beam are one beam to another beam. Are bent so that they do not protrude through the joint surface, so that these ends do not hit the upper beam lower main bar and the lower beam upper main bar near the joint surface. Therefore, these main reinforcements can be arranged in the same vertical plane, and the reinforcement arrangement structure at the joint can be simplified.

Further, since the ribs and the longitudinal bars are disposed between the upper beam and the lower beam, they can effectively resist the shear stress generated between the upper beam and the lower beam. . In addition, since the supporting bars are provided so as to extend between the lower beam upper main bar and the upper beam lower bar, transmission of stress acting between the upper beam and the lower beam can be ensured.

The ribs arranged on the lower beam are U-shaped, and the ribs are arranged on the lower main beam at the lower end of the lower beam in order to finally perform the work of arranging the vertical bars and the cap ties. Even in this case, another reinforcing work can be performed in a state where the upper part of the joint is opened, and this reinforcing work can be facilitated.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a stepped beam reinforcing bar assembly according to the present invention.

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

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

4A and 4B are explanatory views showing a conventional reinforcing bar assembly of a stepped beam, in which FIG. 4A is a cross-sectional view showing a reinforcing arrangement, and FIG. 4B is a cross-sectional view taken along line AA of FIG.

[Explanation of symbols]

REFERENCE SIGNS LIST 10 uneven beam 11 upper beam 12 lower beam 14 lower beam lower main bar 15 rib bar 16 upper beam upper main bar 17 cap tie 18 lower beam upper main bar 19 upper beam lower main bar 20 side bar 21, 22 vertical bar 30 rebar assembly

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E04C 5/06 E04B 1/16 E04G 21/12 105

Claims (2)

(57) [Claims] 1. A reinforcing bar assembly at a joint portion of a stepped beam formed by joining a lower end portion of an upper beam to an upper surface of an end portion of a lower beam, wherein a plurality of reinforcing members are provided at a lower portion of the lower beam along a longitudinal direction thereof. A lower beam lower main bar bent upward so that the end is not protruded above the joint surface, and a lower beam lower main bar is orthogonally attached to the lower beam main bar, and an upper end of the lower beam lower main bar is joined to the lower beam lower main bar. A plurality of U-shaped ribs arranged so as to protrude above the surface, and a plurality of U-shaped ribs arranged along the longitudinal direction of the upper beam above the upper beam and below the joint surface. An upper beam upper main bar that is bent downward so that an end does not protrude; and an upper beam upper bar and an upper beam lower bar that are disposed along the longitudinal direction thereof and have substantially the same level at the joint surface. Lower beam upper bar and upper beam lower bar that are installed facing A reinforcing bar disposed so as to straddle between the lower beam upper main bar and the upper beam lower main bar; and a bending bar of the lower beam lower main bar and the upper beam upper main bar, and A reinforcing bar assembly for a stepped beam, comprising: a substantially L-shaped vertical bar disposed between a lower beam and the upper beam; and cap ties attached to upper portions of the rib bars, respectively.
Body . 2. A method for arranging reinforcing bars at a joint portion of a stepped beam 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 protrude above the joining surface. A plurality of lower beams at the lower end of the lower beam bent upwards are arranged along the longitudinal direction of the lower beam at the lower portion of the lower beam, and a U-shaped rib is formed at the upper end from the joint surface. Arranging a plurality of lower beams so as to protrude upward and perpendicular to the lower main bar of the lower beam, and an upper beam bent downward so as to protrude below the joint surface so that the end does not protrude. A plurality of upper main bars are provided on the upper beam along the longitudinal direction thereof, and are provided on the upper portion of the lower beam and the lower portion of the upper beam along the longitudinal direction thereof and substantially at the joint surface. At the same level, the lower main bar at the upper end of the lower beam and Arranging a reinforcing bar so as to straddle between the lower beam upper main bar and the upper beam lower main bar; and providing a side bar between the lower beam and the upper beam. Adding a substantially L-shaped vertical streak to each bent portion of the lower beam lower main bar and the upper beam upper main bar, and attaching a cap tie to an upper portion of the rib bar, respectively. Reinforcement method for uneven beams.