JP2011089370A - Joint structure of precast concrete beam member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve absorption of a construction error and easy joint of a beam main reinforcement. <P>SOLUTION: A first mechanical joint 12 into which the beam main reinforcement 11 is inserted is arranged in one end part 2a of a beam member 2 made of precast concrete (the precast concrete beam member), and the beam main reinforcement 11 is projected from the other end part 2b. A second mechanical joint 15 is arranged in the midsection of a column-beam joint member 6, and reinforcing iron bars 13 for joint are arranged between the first and second mechanical joints 12, 15. Then the first mechanical joint 12 joints between the beam main reinforcement 11 inserted to the first mechanical joint 12 and the reinforcing iron bars 13 for joint, and the second mechanical joint 15 joints between the reinforcing iron bars 13 for joint and the beam main reinforcement 11 projected from the other end part 2b of the beam member 2. The first mechanical joint 12 is provided with a play 12a which can absorb the construction error of the reinforcing iron bars 13 for joint which are inserted. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a joint structure for precast concrete beam members.

  In recent years, precast concrete members and half precast concrete members have been adopted for the frame for the purpose of shortening the construction period and ensuring quality in building construction.

  For example, according to Patent Document 1, the beam main bar is inserted into a through-hole of a cylindrical outer shell PC member that constitutes the outer periphery of the joint portion and is provided with a through-hole at a position corresponding to the beam main bar on the side surface. There has been disclosed a method for constructing a joint portion of a column beam structure in which concrete constituting the interior of a joint portion is placed in a PC member and concrete constituting the beam portion is placed.

  Further, according to Patent Document 2, a horizontal structure made of PC in which a column fitting and a beam are integrated in advance is mounted on a PC column in a building in a horizontal direction to form a horizontal structure made of PC. The column joint is directly joined to at least the lower PC column at the column beam joint, and the beams are directly joined to at least one beam joint located between the adjacent PC columns. Are connected to the top of the top floor of the building, and the top part of the PC horizontal structure is formed with a plurality of top floor through holes in the vertical direction. A column joint member is embedded in the column head of the PC column for the top floor that supports the body, the column connection member of the column for the top floor PC is inserted through the connection rod for the top floor through the top floor through hole. By inserting and fixing to the top floor PC horizontal structure and the top floor PC pillar at the column beam joint Beam-to-column junction structure of the building that case have been disclosed.

  According to Patent Document 3, a half-PC beam in which a beam upper main bar protruding from both ends is movably inserted into the inside of a barb with the upper part exposed is a long column from the column upper end. A half-PC beam is installed between the columns, with the main reinforcing bar protruding between the columns, and the end of the upper end of the beam is preliminarily moved near one of the beam ends. The half-PC beam end in the direction is dropped onto a column on one side where the beam top main bar is offset near the beam end, and then the beam top main bar that is offset near the beam end is half Move the end of the PC beam to the other side of the PC beam until the end of the half PC beam can be dropped, drop the end of the PC beam on the other side onto the other side of the beam, and then move the main beam top bar to the column. A method of constructing a half-PC beam that reversely moves to a predetermined position in the beam joint area is disclosed.

JP 2008-240291 A JP 2006-104854 A JP 2004-197491 A

  However, since the precast concrete member and the half precast concrete member are manufactured in advance in a factory or the like, there is a problem that it is difficult to process the construction error at the construction site. Further, since these members are joined in a limited space in the joint, it is difficult to perform the operation, and it is particularly difficult to join the main beam of the beam in the limited space.

  The present invention has been made in view of the above-described problems, and provides a precast concrete beam member joining structure capable of absorbing construction errors of precast concrete members at a construction site and facilitating joining of beam main bars. Objective.

  In order to achieve the above object, a precast concrete beam member joining structure according to the present invention is a precast concrete beam member joining structure for joining precast concrete beam members disposed on both sides of a column beam joining member. The beam member is provided with a first mechanical joint in which a beam main bar is inserted at one end, the beam main bar protrudes from the other end, and the beam-to-column connecting member is second in the center. A mechanical joint is disposed, and a reinforcing bar is disposed between the first and second mechanical joints, and the first mechanical joint is inserted into the first mechanical joint. The beam reinforcing bar and the joining reinforcing bar are joined, and the second mechanical joint joins the joining reinforcing bar and the beam reinforcing bar protruding from the other end of the precast concrete beam member, Characterized in that it comprises a first and second at least backlash capable of absorbing construction errors of the joining reinforcing bars either is inserted mechanical joints.

In the present invention, the precast concrete beam member is provided with the first mechanical joint in which the beam main bar is inserted at one end, and the beam main bar protrudes from the other end. A second mechanical joint is disposed in the section, and a reinforcing bar is disposed between the first and second mechanical joints. The first mechanical joint is connected to the first mechanical joint. The inserted beam main bar and the joining reinforcing bar are joined, and the second mechanical joint is joined to the first and second joints by joining the joining reinforcing bar and the beam reinforcing bar protruding from the other end of the precast concrete beam member. Since at least one of the mechanical joints is equipped with a backlash that can absorb the construction error of the joining rebar to be inserted, even if there is a construction error in the insertion position of the joining rebar, the construction error Can be absorbed.
Further, since the beam main bars are joined by the first and second mechanical joints and the joining reinforcing bars, the beam main bars can be easily joined.

Moreover, in the joining structure of the precast concrete beam member which concerns on this invention, the said precast concrete beam member is connected with the precast concrete outer wall frame member previously, It is characterized by the above-mentioned.
In the present invention, the precast concrete beam member is connected to the precast concrete outer wall frame member in advance, so that the precast concrete beam member and the precast concrete outer wall member can be integrated and installed integrally. Can be shortened.

  According to the present invention, the first mechanical joint is disposed on the precast concrete beam member, the second mechanical joint is disposed on the column beam joining member, and the first and second mechanical joints are disposed. Since at least one of the joints has a backlash that can absorb the construction error of the joining rebar to be inserted, even if there is a construction error in the insertion position of the joining rebar, the construction error can be absorbed At the same time, since the beam main bars are joined by the first and second mechanical joints and the reinforcing bars, the beam main bars can be easily joined, making it easy to manage on site, and shortening the work period. Can be achieved.

(A) is a figure which shows the positional relationship with the column member and outer wall PC panel frame by embodiment of this invention, (b) is the sectional view on the AA line of (a). It is a figure which shows an example of the joining structure of the beam member of this Embodiment. (A), (b) is a figure explaining the process of the joining method of the beam member of this Embodiment. (A), (b) is a figure explaining the process following the process of the joining method of the beam member shown in FIG. It is a figure which shows the outline | summary of the test body used for the force test for confirming the intensity | strength of the joining structure of a beam member. It is a figure which shows the force cycle of a force test. Specimen No. It is a figure which shows the relationship between the interlayer deformation angle by the force test of 1 and column shear force. Specimen No. It is a figure which shows transition of the deformation angle component by the force test of 1. FIG. Specimen No. It is a figure which shows the relationship between the interlayer deformation angle by the force test of 2, and column shear force. Specimen No. It is a figure which shows transition of the deformation angle component by the force test of 2. FIG. Specimen No. FIG. 3 is a diagram showing a relationship between an interlayer deformation angle and a column shear force by a force test of No. 3; Specimen No. FIG. 6 is a diagram showing a transition of a deformation angle component by a force test of 3.

Hereinafter, the joint structure of the precast concrete beam member by embodiment of this invention is demonstrated based on FIG. 1 thru | or FIG.
As shown in FIGS. 1 and 2, in the present embodiment, a reinforced concrete beam member (precast concrete beam member) 2 and an outer wall frame member (precast concrete outer wall frame member) precast in a structure having a base isolation structure. 3 are arranged via a column member 5 and a column beam joining member 6 installed on the top of the column member 5, and the column beam is formed by the precast concrete beam member joining structure 1 of the present invention. The beam members 2 disposed on both sides of the joining member 6 are joined.
As shown in FIG. 1, the outer wall PC panel frame 4 has a function as an exterior material and a function as a structure, and a panel 7 such as a photovoltaic power generation panel or a load-bearing wall panel is incorporated in the outer wall frame member 3. It can be used as a multifunctional PC outer wall panel. In the outer wall PC panel frame 4, the beam member 2 is installed on the upper portion of the outer wall frame member 3, and the beam member 2 and the outer wall frame 3 constitute a rice field frame in a front view.

  As shown in FIG. 2, the beam member 2 has a first mechanical joint 12 embedded in one end 2a, and a beam main bar 11 protrudes from the other end 2b. The first mechanical joint 12 is a mechanical joint that has moderate play (clearance) 12a and can absorb construction errors such as displacement of inserted reinforcing bars. Specifically, it is possible to absorb a positional shift in a direction orthogonal to the axial direction of the reinforcing bar.

The column member 5 is integrally provided with a column beam joining member 6 at the upper portion thereof, and the column main reinforcement 14 of the column member 5 passes through the column beam joining member 6. The column member 5 is a partially precast member and is integrated with the beam member 2.
The column beam joining member 6 has a first mechanical joint 12 and a second mechanical joint 15 having the same axial direction and height as the central part. The second mechanical joint 15 is a threaded mechanical joint.

A joining rebar 13 is provided between the first and second mechanical joints 12 and 15, and the joining rebar 13 is disposed so as to straddle the beam member 2 and the column beam joining member 6. .
The first mechanical joint 12 joins the beam main reinforcing bar 11 and the connecting reinforcing bar 13, and the second mechanical joint 15 connects the beam main reinforcing bar 11 protruding from the end 2 b of the beam member 2 and the connecting reinforcing bar. 13 and the beam main reinforcing bars 11 of the beam member 2 disposed on both sides of the column beam connecting portion 6 are connected to the first and second mechanical joints 12 and 15 via the connecting reinforcing bars 13. ing.

Next, a method for joining the outer wall PC panel frame 4 according to the present embodiment will be described.
First, the bar member 5 and the beam-column joining member 6 are arranged as shown in FIG. 3A, and the outer wall PC is placed between the column member 5 and the beam-column joining member 6 as shown in FIG. A panel frame 4 is provided. At this time, the end 2a of the beam member 2 is located on one side of the column-beam joining member 6, and the end 2b of the beam member 2 is located on the opposite side.

And as shown to Fig.4 (a), while inserting the reinforcing bar 13 for joining between the 1st mechanical coupling 12 and the 2nd mechanical coupling 15, the beam member of the 2nd mechanical coupling 15 The main beam 11 that protrudes from the end 2 b of the beam member 2 is inserted into the end 2 b of the second end.
At this time, the joining rebar 13 is based on the position of the end 13a on the second mechanical joint 15 side. The first mechanical joint 12 has a moderate backlash 12a and can absorb construction errors such as displacement of the inserted reinforcing bars, so that the joining reinforcing bars 13 are connected to the end portions 13b on the first mechanical joint 12 side. By adjusting the position at the insertion position to the first mechanical joint 12, the beam member 2 and the beam-to-column joining member 6 can be joined at a predetermined position even when there is a construction error of the beam member 2. The outer wall PC panel frame 4 is disposed at a predetermined position.

The sleeves of the first and second mechanical joints 12 and 15 are filled with a filler such as mortar to join the beam reinforcing bar 11 and the joining reinforcing bar 13.
Next, as shown in FIG. 4 (b), concrete is placed on the column member 5 and the column beam joining member 6, the beam member 2 and the column beam joining member 6 are joined, and the adjacent outer wall PC panel frame 4 is connected. Be joined. At this time, the side surface of the outer wall PC panel frame 4 can be a part of the mold of the column member 5 and the column beam joining member 6, and the installation and removal work period of the mold can be shortened.

Next, the effect of the joint structure of the precast concrete beam members according to the above-described embodiment will be described with reference to the drawings.
In the joint structure 1 of the precast concrete beam member according to the present embodiment, the first mechanical joint 12 capable of absorbing the construction error of the reinforcing bar inserted into the end portion 2a of the beam member 2 is provided. Since the second mechanical joint 15 is provided and the joining rebar 13 is disposed between the first and second mechanical joints 12 and 15, the construction error of the beam member 2 is absorbed at the construction site. In addition, it is possible to easily join the beam main bars, to easily perform on-site management, and to shorten the work period.

Here, a force test was performed on a test body having a joint structure of precast concrete beam members according to the present embodiment.
As shown in FIG. 5 (a), the test body is a full-scale scale. As shown in FIG. 5A, a part of the column member 5 is disposed above and below the column beam joining member 6, and the outer wall PC panel including the beam member 2 on both sides. A part of the frame 4 is disposed.
As shown in the list of specimens in FIG. No. 1 has a mechanical joint in the joint (column beam joint member). 2 and Specimen No. No. 3 does not have a mechanical joint at the end. In addition, the specimen No. 1 and specimen No. No. 2 has the same bar arrangement and specimen No. 3 has different bar arrangements.
In the force test, the column axial force is set to 0.1σ _B · D · B, and in the force cycle shown in FIG. 6, the interlayer deformation angles are ± 1/500, ± 1/300, ± 1/200, ± 1 / It was loaded alternately with positive and negative two times so as to be 100.

Next, the results of the force test described above will be described with reference to the drawings.
7 to 12 show the load deformation relationship and the transition of the deformation angle component of each specimen. As can be seen from FIG. 7 and FIG. No. 1 has a stable load deformation relationship, and the specimen No. 1 shown in FIG. It can be confirmed that this is the same as the load deformation relationship of No. 2.
Therefore, even if a joint is provided in the joint, there is no problem in structural performance, and the first mechanical joint 12 is disposed at the end 2a of the beam member 2, and the second mechanical joint is provided at the beam-column joint 6. The structural performance of the joint structure of the precast concrete beam member of the present invention in which 15 is disposed and the rebar 13 for joining is disposed between the first and second mechanical joints 12 and 15 is verified.

As mentioned above, although embodiment of the joining structure of the precast concrete beam member by this invention was described, this invention is not limited to said embodiment, In the range which does not deviate from the meaning, it can change suitably.
For example, in the above-described embodiment, the beam member 2 is integrated with the outer wall frame member 3 in advance to form the outer wall PC panel frame 4, but may not be integrated with the outer wall frame 3 in advance. The joint structure 1 of the precast concrete beam member of the present invention may be applied to the joint of the beam member 2 that is not integrated with the frame 3.
Further, for example, in the above-described embodiment, the precast concrete beam member joining structure 1 of the present invention is adopted for a structure having a seismic isolation structure. You may employ | adopt the joining structure 1 of the precast concrete beam member of invention.
Moreover, in embodiment mentioned above, the 1st mechanical coupling 12 installed in one edge part of the beam member 2 is made into the mechanical coupling which can absorb the construction error of a reinforcing bar, and is installed in the column beam joining member 6. Although the second mechanical joint 15 is a threaded mechanical joint, for example, the first and second mechanical joints 12 and 15 may be mechanical joints that can absorb construction errors of reinforcing bars.

1 Joint structure of precast concrete beam members 2 Beam members (precast concrete beam members)
3 Outer wall frame member (Precast concrete outer wall frame member)
4 External wall PC panel frame 6 Beam-column joint 11 Beam main reinforcement
12 1st mechanical joint 13 Reinforcing bar for joining 13a End 13b End 15 Second mechanical joint

Claims (2)

In the joint structure of the precast concrete beam member that joins the precast concrete beam member disposed on both sides of the column beam joint member,
The precast concrete beam member has a first mechanical joint in which a beam main bar is inserted at one end, and the beam main bar protrudes from the other end, and the column beam joint member A second mechanical joint is disposed, and a joining rebar is disposed between the first and second mechanical joints, and the first mechanical joint is the first mechanical joint. The main reinforcing bar inserted into the joint is joined to the joining reinforcing bar, and the second mechanical joint is joined to the joining reinforcing bar and the main reinforcing beam protruding from the other end of the precast concrete beam member. At least one of the first and second mechanical joints is provided with a backlash capable of absorbing construction errors of the joining reinforcing bars to be inserted.   The joint structure of precast concrete beam members according to claim 1, wherein the precast concrete beam members are connected in advance to a precast concrete outer wall frame member.

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