JP2014173273A - Preassembled reinforcement and installation method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a preassembled reinforcement installation method capable of smoothly incorporating a column main reinforcement into a beam preassembled reinforcement.SOLUTION: The preassembled reinforcement installation method 1 comprises a step S1 of assembling beam reinforcements 20A-20D on the ground and forming as a beam preassembled reinforcement 70 by arranging a cylindrical pipe 60 in a column-beam joining part 30 for penetrating a column main reinforcement 11 among these assembled beam reinforcements 20A-20D, a step S2 of installing the plurality of column main reinforcements 11 on a beam bottom form 50 while being inserted into the pipe 60 by suspending this beam preassembled reinforcement 70 and a step S3 of extracting the pipe 60 upward.

Description

  The present invention relates to a prefabricated reinforcing bar and an installation method thereof.

2. Description of the Related Art Conventionally, a pre-assembled method is known in which column rebars and beam rebars are assembled in advance at another place to form a pre-assembled rebar, and the pre-assembled rebar is lifted with a crane or the like and installed at a place of rebar in the field.
When applying the pre-assembled method to the beam reinforcing bar, specifically, the beam main reinforcing bar, the stirrup bar, the core reinforcing bar, etc. are assembled at the ground ground yard to make the beam leading bar reinforcing bar. Next, this beam-end rebar is lifted by a crane or the like, and is lowered and installed on the bar arrangement part from above. When the column main reinforcement protrudes upward in the panel zone, the column main reinforcement of the panel zone is inserted into the gap between the beam-end assembled bars.

  However, since the beam-end reinforcing bar and the column main reinforcement are both deformed reinforcing bars, when the column main reinforcement is inserted into the gap between the beam-end assembly reinforcing bars, the column main reinforcement is caught by the beam reinforcement, the abdominal muscle in the panel zone, the core reinforcement, etc. There was a problem that it took a lot of time and effort to install the beam end rebar in the beam arrangement.

  Therefore, a method has been proposed in which a cylindrical guide jig with a sharp tip is prepared, this guide jig is placed on the upper end of the column main reinforcement, and the beam-end rebar is installed in the bar arrangement in this state (patent) Reference 1). If it does in this way, first, the front-end | tip of a guide jig will pass the clearance gap of a beam tip assembly rebar smoothly, and will be next guided by this guide jig, and a column main reinforcement will be inserted in the clearance gap of a beam end assembly reinforcement. It will be.

JP-A-7-113261

  However, in such a guide jig, there is a problem in that a portion of the column main reinforcing bar, such as a barn that is not covered by the guide jig, is caught by the pre-assembled reinforcing bar.

  An object of the present invention is to provide a pre-assembled rebar that can smoothly incorporate a column main rebar into the pre-assembled rebar and a method for installing the same.

  The prefabricated reinforcing bar installation method according to claim 1 (for example, a prefabricated reinforcing bar installation method 1 described later) assembles beam reinforcing bars (for example, beam reinforcing bars 20A to 20D described later) on the ground and the assembled beams. A cylindrical pipe (for example, a pipe 60 described later) is arranged at a position (for example, a column beam joint 30 described later) through which a column main reinforcing bar (for example, a column main reinforcing bar 11 described later) penetrates, and a pre-assembled reinforcing bar is provided. (E.g., a beam-end rebar 70 described later) (e.g., step S1 described later), and the front-end rebar is lifted, and a plurality of column main bars are inserted into the pipe at predetermined positions (e.g., described later). It is characterized by comprising a step (for example, step S2 to be described later) installed on the beam bottom mold 50) and a step for pulling the pipe upward (for example, step S3 to be described later).

  According to a second aspect of the present invention, the pre-assembled reinforcing bar includes an assembled beam reinforcing bar and a cylindrical pipe disposed at a position where the column main reinforcing bar penetrates the assembled beam reinforcing bar.

  According to the present invention, a beam reinforcing bar is assembled on the ground, and a cylindrical pipe is disposed at a position where the column main reinforcing bar penetrates among the assembled beam reinforcing bars to obtain a pre-assembled reinforcing bar. Then, this pre-assembled reinforcing bar is lifted and installed at a predetermined position while inserting a plurality of column main reinforcing bars through the pipe. At this time, since the inner surface of the pipe is smooth, the column main bars are not caught by the beam main bars, the abdominal muscles in the panel zone, the core bars, and the like, and the column main bars can be smoothly incorporated into the prefabricated reinforcing bars.

It is a perspective view of the column beam reinforcing bar 2 arranged by the pre-assembled reinforcing bar installation method concerning one embodiment of the present invention. It is a flowchart of the pre-assembled reinforcing bar installation method according to the embodiment. It is a perspective view (the 1) for demonstrating the pre-assembled reinforcing bar installation method concerning the embodiment. FIG. 6 is a perspective view (No. 2) for explaining the pre-assembled reinforcing bar installation method according to the embodiment. It is a top view of the pre-assembled reinforcing bar according to the embodiment. It is AA sectional drawing of FIG. It is a perspective view (the 3) for demonstrating the pre-assembled reinforcing bar installation method which concerns on the said embodiment. It is a perspective view of the pipe used for the pre-assembled reinforcing bar installation method concerning the modification of the present invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a column beam reinforcing bar 2 arranged by a pre-assembled reinforcing bar installation method 1 (see FIG. 2) according to an embodiment of the present invention. In FIG. 1, the core and abdominal muscles are omitted for easy understanding.

  The column rebar 2 has a column rebar 10 arranged to a predetermined height and four beam rebars 20A, 20B, 20C, and 20D that are fixed to the column rebar 10.

  The column reinforcing bars 10 extend in a substantially vertical direction, and the beam reinforcing bars 20A to 20D extend in a substantially horizontal direction. The beam reinforcing bar 20A and the beam reinforcing bar 20C are arranged on a straight line, and the beam reinforcing bar 20B and the beam reinforcing bar 20D are arranged on a straight line. The beam reinforcing bars 20A and 20C and the beam reinforcing bars 20B and 20D extend substantially orthogonally.

  The column reinforcing bars 10 and the beam reinforcing bars 20 </ b> A to 20 </ b> D intersect with each other at the column beam joint 30 (panel zone) of the column reinforcing bars 10.

Here, the column reinforcing bar 10 includes twelve column main bars 11 extending in a substantially vertical direction, and band bars (shear reinforcement bars) 12 arranged around the column main bars 11 at predetermined intervals.
The column main reinforcing bar 11 of the column reinforcing bar 10 penetrates the column beam joint 30 and extends upward.
The band 12 is also provided at the column beam joint 30 of the column rebar 10.

Each of the beam reinforcing bars 20A to 20D includes four upper and lower beam main bars 21 extending side by side in a substantially horizontal direction, and rib bars (shear reinforcing bars) 22 arranged around the beam main bars 21 at predetermined intervals. A core muscle and an abdominal muscle not shown.
The beam reinforcing bar 21 of the beam reinforcing bar 20A extends through the column beam joint 30 and becomes the beam reinforcing bar 21 of the beam reinforcing bar 20C. Moreover, the beam reinforcement 21 of the beam reinforcement 20B extends through the column beam joint 30 and becomes the beam reinforcement 21 of the beam reinforcement 20D.

  The column beam formwork 3 is built in the above-mentioned column beam reinforcement 2. The column beam form 3 includes a column form frame 40 that is built up to the height of the lower end of the beam surrounding the column rebar 10 and a beam bottom form frame 50 that extends from the column form frame 40 and supports the beam rebars 20A and 20B. And comprising.

FIG. 2 is a flowchart of the first reinforcing bar installation method 1.
First, in the initial state, as shown in FIG. 3, the column reinforcing bars 10 are arranged, and the column beam formwork 3 is built in the column reinforcing bars 10. Thereby, the column main reinforcement 11 of the column reinforcement 10 is in a state of protruding upward from the panel zone of the beam bottom formwork 50.

  In step S1, as shown in FIGS. 4 to 6, the beam reinforcing bars 20A to 20D are assembled on the ground, and the column beam connecting portion 30 through which the column main reinforcing bar 11 penetrates among the assembled beam reinforcing bars 20A to 20D is cylindrical. A pipe 60 having a shape is arranged to form a beam-end rebar 70.

  The pipe 60 is made of, for example, a vinyl chloride resin and is used for a water supply facility or a drainage facility. Further, this pipe 60 is surrounded by the band 12 within the beam-column joint 30 and is slightly longer than the height dimension of the beam-column joint 30. In addition, the pipe 60 is loosely fixed to the column beam joint 30 of the beam end rebar 70 with a certain amount of play with a binding wire or the like.

  In step S2, as shown in FIG. 7, the beam tip rebar 70 is lifted by a crane or the like and lowered onto the beam bottom formwork 50 to be installed. At this time, the column main reinforcement 11 protruding upward in the panel zone is simultaneously inserted into the pipe 60.

  In step S <b> 3, the pipe 60 is pulled upward from the column beam joint 30. Thereby, it becomes a column beam reinforcement 2 like FIG.

According to this embodiment, there are the following effects.
(1) While assembling the beam rebars 20A to 20D on the ground, a resin-made cylindrical pipe 60 is arranged at the column beam joint 30 through which the column main reinforcement 11 penetrates among the assembled beam rebars 20A to 20D. The beam point rebar 70 is used. Then, this beam tip rebar 70 is lifted and installed on the beam bottom formwork 50 while the column main reinforcement 11 in the beam bottom formwork 50 is inserted into the pipe 60.
At this time, since the inner surface of the resin pipe 60 is smooth, the column main bars 11 are not caught by the beam main bars 21, the abdominal muscles and the core bars in the panel zone, and the column main bars 11 are smoothly incorporated into the beam-end reinforcing bars 70. Can do.

  It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.

For example, in the above-described embodiment, the beam-end assembled bar 70 is suspended on the beam bottom formwork 50, and the column main bars 11 protruding upward in the panel zone are simultaneously inserted into the pipe 60. Absent. That is, when the number of column main bars 11 is large and it is difficult to simultaneously insert the column main bars 11 into the pipe 60 by the above-described method, the beam tip rebar 70 is placed on the beam bottom formwork 50 by the following procedure. It may be installed.
That is, in step S <b> 2, the beam tip rebar 70 is lifted and positioned immediately above the column main reinforcement 11, and in this state, each pipe 60 is pulled down from the beam tip assembly rebar 70 one by one to cover the column main reinforcement 11. Then, the beam tip rebar 70 is lowered, and all the column main bars 11 are incorporated into the column beam joint 30 of the beam tip rebar 70 using the pipe 60 as a guide.

In this way, in addition to the above (1), the following effects can be obtained.
(2) Even when the number of column main bars 11 is large, the column main bars 11 can be smoothly incorporated into the column beam joint 30 of the beam-end reinforcing bar 70.

Moreover, as shown in FIG. 8, you may provide the slit 61 from an upper end to a lower end along the length direction of the pipe 60, or provide a notch | incision.
In this way, in addition to the above (1), the following effects can be obtained.
(3) The pipe 60 can be easily attached to and detached from the column main reinforcement 11 through the slit 61.
In addition, since the slit 61 is provided, the diameter of the pipe 60 can be changed in accordance with the diameter of the reinforcing bar of the columnar main bar 11, so that the core bar can be reliably hooked to the columnar main bar 11.

  The reason is as follows. In other words, in the column beam joint 30, it is necessary to bend the both ends of the core bar in a hook shape and hook it on the column main bar 11. Therefore, in the present invention, the core muscle is hooked on the pipe 60, the pipe 60 is pulled out, and the core muscle is hooked on the column main muscle 11. Accordingly, the bending radius of the hook of the core bar is determined according to the pipe 60. However, if the pipe 60 is thick, the bending radius of the hook of the core bar also increases. The catch between the core core and the column main muscle 11 becomes loose.

  Therefore, it is desirable that the pipe 60 be as thin as possible and close to the thickness of the columnar main bar 11. However, if the pipe 60 is too thin, the pipe 60 will not come out of the columnar main bar 11. If the diameter of the pipe 60 can be changed to some extent, The child muscle can be reliably hooked to the column main muscle 11.

DESCRIPTION OF SYMBOLS 1 ... Pre-set reinforcing bar installation method 2 ... Column beam reinforcement 3 ... Column beam formwork 10 ... Column reinforcement 11 ... Column reinforcement 12 ... Band reinforcement 20A, 20B, 20C, 20D ... Beam reinforcement 21 ... Beam reinforcement 22 ... Stirrup 30 ... Beam-to-column joint 40 ... Column form 50 ... Beam bottom form 60 ... Pipe 61 ... Slit 70 ... Beam tip rebar

Claims (2)

On the ground, assembling the beam reinforcing bar, placing the cylindrical pipe at the position where the column main reinforcing bar penetrates among the assembled beam reinforcing bar,
Hoisting the pre-assembled rebar, and installing it at a predetermined position while inserting a plurality of column main bars through the pipe;
And a step of pulling out the pipe upward.   A pre-assembled reinforcing bar comprising: an assembled beam reinforcing bar; and a cylindrical pipe disposed at a position through which the column main reinforcing bar penetrates among the assembled beam reinforcing bars.

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