JP2015055059A - Beam connection structure and beam connection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve both an increase in efficiency of beam main reinforcement connection work and shortening of steps for the whole structure.SOLUTION: In a beam connection structure, beam main reinforcements 5A provided for at least two beams 5 are arranged in a state of passing through a column 4, and concrete for the beams 5 and the column 4 is placed so that the beams 5 can be integrally connected together via the column 4. Connection parts R of the beam main reinforcements 5A are arranged within the column 4.

Description

  In the present invention, beam main bars provided in at least two beams are arranged in a state of penetrating a column, and the beams are connected to each other through the column by placing concrete between the beam and the column. The present invention relates to a beam connection technique such as a beam connection structure and a beam connection method in which ends of at least two beams are connected via columns.

Conventionally, as this type of beam connection technique, first, in the formwork installation process, a pillar formwork is installed, and from the upper end of the pillar formwork to both sides (or may include a crossing direction). Groove-shaped beam molds whose upper ends are open in the extending cross section are assembled, and slab molds extending from the respective upper end edges of the beam mold frames in the horizontal direction are installed.
Next, a reinforced concrete structure is formed through a bar arrangement process and a concrete placing process (see, for example, Patent Document 1).
In the above bar arrangement process, reinforcing bars such as beam main bars are installed in the beam form extending on both sides of the column form, and the slab form is installed on the slab form. The construction efficiency is improved by performing the placement collectively over the columns, beams and slabs.
In addition, the connection point of the beam main bar is located at a point where the tensile force acting on the beam main bar is small (for example, the upper main bar is the central region in the beam longitudinal direction and the lower main bar is the end side region in the beam longitudinal direction). Generally set. Further, the beam main bars installed in the beam end side region are generally installed in a state of penetrating the column and extending over the other beam.

Japanese Patent Laid-Open No. 10-266445 (FIGS. 23 and 24)

According to the conventional beam connecting technique described above, the connecting work of the beam main bars must be performed in a narrow space in the beam formwork, so that there is a problem that the work is not progressed and the work efficiency is likely to be lowered.
In order to solve this problem, it is conceivable to expand the rebar connection work space by opening the side form of the beam formwork. In this case, it corresponds to the expanded rebar connection work space. Since the supporting member that supports the slab formwork from below cannot be installed at the place to be done, as a result, the installation of the slab formwork and the installation of the slab muscle are postponed.
As a result, there is a concern that the entire process related to the construction of the structure may be delayed.

  Accordingly, an object of the present invention is to provide a beam connecting technique that can solve the above-described problems and can improve the efficiency of connecting main beam bars and shorten the process of the entire structure.

  According to a first characteristic configuration of the present invention, beam main bars provided in at least two beams are arranged in a state of penetrating a column, and the beams are placed in the column by placing concrete between the beam and the column. The beam connecting structure is integrally connected via a beam, and the connecting portion of the beam main reinforcement is located in the column.

According to the first characteristic configuration of the present invention, the connecting portions of the beam main bars can connect the beam main bars within the column cross-section that provides a wider space than within the beam cross-section. Work efficiency can be improved.
In addition, since it is possible to eliminate the connection of the main beam within the beam formwork, the installation of the beam formwork and the installation of the slab formwork can be performed at the same time. It is possible to shorten the construction period of the whole structure by carrying out at once.
Furthermore, it is also possible to adopt a method in which the beam reinforcing bar unit composed of beam main bars and stirrups is formed in advance by a method such as grounding and dropped into the finished beam formwork. Therefore, the construction period of the entire structure can be further shortened.

  The 2nd characteristic structure of this invention exists in the place where the beam connection location of the said pillar is a footing part currently formed on the seismic isolation apparatus.

According to the second characteristic configuration of the present invention, the footing portion is designed to reduce the load burden during the earthquake by the seismic isolation device installed below the footing portion. Even if these are consolidated, the stress acting on the reinforcing bar itself is reduced, and the desired strength can be ensured reliably.
Further, since the footing part can easily secure a wide space as a connecting work space for the beam main bars as compared with a general column cross section, further improvement in the connecting work efficiency of the beam main bars can be expected.

  A third characteristic configuration of the present invention is a beam connection method for connecting ends of at least two beams via columns, the corresponding form of the beam and the type of the beam connection portion of the column. Each of the beam rebar units assembled with the frame and the end of the beam main bar projecting from the beam end face is dropped into the corresponding beam formwork and set, and the beam connecting part type of the column is set. It exists in the place which connects the edge part of the said beam main reinforcement which protruded in the frame.

According to the third characteristic configuration of the present invention, the beam reinforcing bar unit can be efficiently formed in a wide space, the beam main reinforcing bars can be connected to each other within a wide column cross section, Frame installation and beam rebar unit assembly can be performed in parallel.
In addition, the installation of the slab form adjacent to the form of the beam can be carried out at the same time, so it is also possible to continuously arrange the columns, the beam and the slab, and place the concrete at once. The construction period as a whole can be shortened.

Cross-sectional view of the main part of the building showing the beam connection status in the direction of the beam axis II-II sectional view in FIG. Partially cutaway perspective view showing the installation status of the formwork Beam side cross-sectional view showing beam connection procedure

  Embodiments of the present invention will be described below with reference to the drawings.

  1 and 2 show a main part of a building formed by adopting an embodiment of a beam connecting structure of the present invention. A building B is a building on a foundation 1 via a plurality of seismic isolation devices 2. This is a base-isolated building in which the main body 3 is formed.

  Although the details are not described for the foundation 1, various structures such as those provided with foundation piles, those based on a direct foundation, and those combined with them can be employed.

The seismic isolation device 2 can employ various seismic isolation bearings such as a seismic isolation rubber bearing and a sliding bearing.
In this embodiment, as shown in FIG. 1, the seismic isolation rubber bearing is described as an example.
The seismic isolation rubber bearing is formed by integrally providing a multilayer rubber 2b formed by alternately laminating a plurality of thin metal layers and rubber layers between a metal upper flange 2a and a lower flange 2c. .
The seismic isolation device 2 is attached to the foundation 1 or the building body 3 by fixing the upper flange 2a and the lower flange 2c with bolts.

The building body 3 includes a pillar 4 provided on each seismic isolation device 2, a beam 5 provided over the adjacent pillar 4, a floor slab 6 provided on the upper edge of the beam 5, and the like. It is prepared.
The building body 3 is constructed as a reinforced concrete structure mainly made of cast-in-place concrete, and the basic construction procedures are the formation of the form corresponding to each part, the arrangement of the rebar in the form, and the concrete It is implemented according to the order of placement.

The column 4 is configured to receive the vertical axial force of the building body 3 and transmit it to the foundation. Although not shown in the drawing, the column main bar, the hoop bar and other reinforcing bars are arranged to provide concrete. It is formed by casting.
Moreover, the lower end part of the pillar 4 is located on the seismic isolation device 2, and is comprised as the footing part 4A which plays the role of load transmission.
As shown in FIG. 2, a plurality of beams 5 are integrally extended around the footing portion 4A. That is, the plurality of beams 5 are connected to each other in the footing portion 4 </ b> A, and the footing portion 4 </ b> A corresponds to the beam connecting portion J of the column 4.

As shown in FIGS. 1 to 3, the beam 5 is formed in a rectangular cross-sectional shape, and a plurality of beam main bars 5A are arranged side by side at a predetermined interval and surround the outer peripheral surface of the plurality of beam main bars 5A. Stirrup 5B is provided in the state.
The stirrups 5 </ b> B are installed at intervals in the longitudinal direction of the beam 5.

Further, the beams 5 connected to each other with the footing portion 4A interposed therebetween are connected in a state where the beam main reinforcing bars 5A penetrate the footing portion 4A.
Incidentally, the connecting portion R between the beam main bars 5A is provided inside the footing portion 4A.
As a specific example, the beam main reinforcing bar 5A is dimensioned so that its end protrudes to the footing part side from the beam end face, and between the ends of the beam main reinforcing bar 5A protruding in a facing state, the connecting beam main reinforcing bar By joining 5C, the beam main reinforcing bars 5A are connected to each other, and both end positions of the connecting beam main reinforcing bars 5C correspond to the connecting portions R (see FIG. 2).
The beam main bars 5A and 5C can be connected by, for example, pressure welding or enclose welding, or can be connected using a mechanical joint.

  The floor slab 6 is provided in a state extending laterally from the upper edge of the beam 5 and is formed by casting concrete together with the slab bars arranged in a mesh shape, not shown in the drawing. (See FIG. 1).

Next, the formation procedure of the pillar 4, the beam 5, and the floor slab 6 will be described.
[1] As shown in FIG. 4A, a form 7 corresponding to the pillar 4, the beam 5, and the floor slab 6 is formed.
The formwork 7A corresponding to the footing portion 4A of the pillar 4 is configured by a wall plate 7Aa constituting a side surface portion and a bottom plate 7Ab constituting a lower surface portion. The bottom plate 7Ab is driven as a part of the footing portion 4A. (Refer to FIG. 3). This precast concrete panel is a driving form and also functions as an upper plate of the seismic isolation device 2.
The formwork 7B corresponding to the beam 5 is composed of a wall plate 7Ba constituting a side surface portion and a bottom plate 7Bb constituting a lower surface portion.
Although not shown in the drawing, the mold 7C corresponding to the floor slab 6 is composed of a wall plate constituting a side surface portion and a bottom plate 7Cb constituting a lower surface portion (see FIG. 3).
Moreover, each bottom plate 7Ab, 7Bb, 7Cb is supported by the support work S.

[2] As shown in FIG. 4 (b), the beam reinforcing bar 5A and the stirrup 5B are assembled in a predetermined shape in a space outside the formwork in advance to form a beam reinforcing bar unit Y. Then, it is set in the form 7B of the beam 5 (see FIG. 3).
At that time, the beam reinforcing bar 5A of the beam reinforcing bar unit Y is dimensioned to a length in which the end protrudes into the footing part 4A in the set state.

[3] As shown in FIG. 4 (c), in the formwork 7A of the footing portion 4A, the connecting beam main reinforcing bars 5C are arranged between the beam main reinforcing bars 5A opposite to each other so as to form a series. Each of them is connected, and concrete is placed in a range corresponding to the footing portion 4A, the beam 5, and the floor slab 6.
After passing through a sufficient curing period, the pillar 4, the beam 5 and the floor slab 6 are integrally formed by removing the mold (see FIG. 1).

According to the beam connection technique described in the present embodiment, the connection between the beam main bars 5A can be performed by the footing portion 4A which is a larger space than in the cross section of the beam, so that the efficiency of rebar connection work can be improved. In addition, since the beam reinforcing bar unit Y can be assembled in advance in a wide space outside the formwork, the formation efficiency and quality of the beam 5 itself can be improved.
Furthermore, since the respective forms 7 of the pillar 4, the beam 5 and the floor slab 6 can be installed together and the beam reinforcing bar unit Y can be formed in parallel therewith, the time of each bar arrangement work at the site is possible. Shorten the construction period for the entire building.

[Another embodiment]
Other embodiments will be described below.

<1> The structure that is the target of the beam connection technique is not limited to the seismic isolation building described in the previous embodiment, and may be a structure that does not include the seismic isolation device 2, for example.
Even in the case of a base-isolated building, the present invention may be applied to beam connection below the base-isolated layer.
<2> The beam connecting portion J of the column 4 is not limited to the footing portion 4A described in the previous embodiment, and may be a column portion similar to the general portion of the column 4, for example.
In addition, the beam connecting portion J of the column 4 is not limited to connecting four beams 5 orthogonal to each other, but includes, for example, a connection of three beams 5 crossing a “T” shape, a single character shape, “ It may be a connection of two beams 5 intersecting in an “L” shape.
<3> The connection between the beam main bars 5A at the beam connection point J of the column 4 is not limited to being performed with the connection beam main bars 5C interposed as described in the previous embodiment. The beam main reinforcing bars 5A may be directly connected to each other.
Further, the connection method can be appropriately selected from pressure welding, enclose welding, mechanical joint, and the like.

  In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry. In addition, it goes without saying that the present invention can be carried out in various modes without departing from the gist of the present invention.

2 Seismic isolation device 4 Column 4A Footing part 5 Beam 5A Beam main bar 7A Formwork 7B Formwork J Beam connection point R Connection part Y Beam rebar unit

Claims (3)

A beam main bar provided in at least two beams is arranged in a state of penetrating a column, and the beams are integrally connected via the column by placing concrete between the beam and the column. A connected structure,
The connecting portion of the beam main reinforcement is a beam connecting structure arranged in the column.   The beam connection structure according to claim 1, wherein the beam connection portion of the column is a footing portion formed on a seismic isolation device. A beam connecting method for connecting ends of at least two beams through a column,
Assembling the corresponding form of the beam and the form of the beam connecting part of the column,
Set each beam rebar unit assembled in a state where the end of the beam main bar protrudes from the beam end surface into the corresponding beam formwork,
A beam connection method for connecting ends of the beam main bars protruding into a formwork of a beam connection portion of the column.

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