JPH0454786B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] Industrial Field of Application The present invention relates to a method for assembling reinforcing bars for beams in reinforced concrete rigid frame structures.

Conventional technology Conventional methods for assembling reinforcing bars for beams can be roughly divided into the following three types.

(1) Rebar pre-assembly method A method in which stirrups and beam reinforcing bars are assembled in advance at a separate location to create a cage-like structure and then installed at a predetermined location.

(2) Drop-down method A method in which reinforcing bars are assembled one by one directly above the beam formwork to form a cage, and then this is lowered into the beam form using a jig or crane.

(3) In-situ assembly method A method in which reinforcing bars are assembled one by one within the beam formwork.

Problems to be Solved by the Invention However, while the reinforcing bar assembly method shortens the reinforcing bar assembly process at the factory site, it weighs several hundred kilograms, making it difficult to handle manually.
Trucks and cranes are required for transportation and installation, which incurs costs.

In the case of the drop-down method, the construction period is longer because each piece is assembled at the construction site, and jigs and jigs for lifting are required.
Or a crane is required, which is costly.

In addition, while the in-situ assembly method does not particularly require trucks, jigs, cranes, etc. for transportation and lifting, it takes a long time to assemble each beam within the beam formwork, and Since the stirrup is assembled, the top beam reinforcement (main reinforcement) at the corner
A hoop for placing the hoop and a kanzai reinforcement are constructed at an early stage. In other words, the kanzai reinforcement, etc. is stretched over the beam formwork, and the upper end beam reinforcement of the corner is supported by this, and from this beam reinforcement, the beam is Since the stirrup is suspended within the formwork and other main reinforcements are incorporated into it, it is difficult to attach the main reinforcement such as the beam bottom reinforcement, sleeve, etc. in the later process, and the construction is time-consuming. It is necessary to tie it to the beam reinforcement at the corner so that it does not move during concrete pouring, but the top beam reinforcement (main reinforcement) at the corner and the Kanzashi reinforcement on which it rests become a corner and form a beam. It is difficult to reach the bottom of the frame, which makes construction time-consuming, and sometimes corners are unavoidably cut, and the beam's performance may not be guaranteed.

The present invention therefore seeks to eliminate these drawbacks.

[Structure of the Invention] Means for Solving the Problems The present invention arranges a plurality of U-shaped stirrups at predetermined intervals, and makes two parallel auxiliary bars orthogonally intersect at the bottoms of these U-shaped stirrups. After joining, U-shaped cage reinforcements were pre-assembled, and the U-shaped cage reinforcements were inserted into the beam formwork and placed appropriately to ensure a predetermined concrete cover thickness on the U-shaped cage reinforcements. It is placed on the beam bottom end separator and erected in a predetermined position, and the main reinforcements such as the beam bottom end reinforcement, abdominal reinforcement, beam top end reinforcement, etc., the upper stirrup, and other required reinforcing bars are assembled in the U-shaped cage reinforcement at the current location. shall be.

Embodiment The drawings show an embodiment of the present invention, which adds the advantages of the reinforcing bar pre-assembly method to the conventional in-situ assembly method and eliminates the drawbacks of the conventional method. This will be explained in detail below.

First, the U-shaped cage reinforcement 1 shown in FIG. 2 is pre-assembled. The U-shaped cage bar 1 has a plurality of U-shaped stirrups 11 bent inwardly at both tips at predetermined intervals, and two parallel U-shaped stirrups with a diameter of about 10 mm are attached to the bottoms of these U-shaped stirrups. Book auxiliary plot 12,1
2 are joined perpendicularly to form a cage shape. In addition,
In order to prevent deformation of the U-shaped cage muscles, auxiliary muscles may also be attached to the sides thereof. Further, the U-shaped cage reinforcement 1 is made to have a length of 2 to 3 m in order to have a weight that can be easily transported and attached by hand.

Next, the order of assembling reinforcing bars at the site will be explained below with reference to FIGS. 1 and 3.

1 Assemble column reinforcement 4 (wrap it in a hoop to the bottom end of the beam).

2. Assemble a series of formworks 5 such as column formwork 51, beam formwork 52, slab formwork 53, etc.

3 Install the beam bottom end separator 61 (install it in a position that ensures the concrete cover thickness of the stirrup).

4. Install the U-shaped cage bars 1 in the beam formwork 52 and link them (place them on the separators 61).

5 Assemble the beam bottom reinforcements 21 of the main reinforcements 2 (it is only necessary to partially bind them to the U-shaped cage reinforcements).
Furthermore, the beam reinforcement at the upper end of the corner is not installed, so it is easy to reach).

6. Install sleeves and reinforcing bars (not shown) for equipment piping.

7 Install the beam upper end separator 62...

8 Panel zone hoop winding (not shown).

9 Attach the abdominal muscles 22 of the main reinforcements 2.

10 Install the beam top end reinforcements 23 of the main reinforcements 2.

11 Attach stirrup 3 at the top end.

12 Install the donut space (not shown).

In short, within the beam formwork 52, the beam reinforcing bars can be installed in an orderly manner from the bottom.

〔Effect of the invention〕

According to the present invention, the pre-assembled U-shaped basket bars are
Since the U-shaped cage reinforcement is placed on the beam lower end separator appropriately placed to ensure a predetermined concrete cover thickness and is erected in a predetermined position, the beam lower end separator can also be used as a spacer, and the U-shaped cage reinforcement can be stably erected in a predetermined position without using unstable spacers, and since the erected U-shaped cage reinforcement does not initially have abdominal reinforcement, beam top reinforcement, etc. Not only can main reinforcements such as top reinforcements, upper stirrups, panel zone hoops, etc. be assembled from below in an orderly manner, but also sleeves for equipment piping perpendicular to the beam direction and intermediate/beam top end separators, etc. can be inserted in an orderly and smooth manner. And, the abdominal muscles can be freely adapted to the situation at the joints with the pillars, and each installation is therefore extremely easy, and the labor of construction can be greatly reduced, and the construction period can be shortened.

In addition, the pre-assembled U-shaped cage bars are made by joining two parallel auxiliary bars orthogonally to the bottoms of multiple U-shaped stirrups arranged at predetermined intervals. When stacking the basket bars, by slightly shifting the positions of the U-shaped stirrups in the longitudinal direction of the cage bars, it is possible to combine and overlap them closely, without creating wasted stacking space. Therefore, bulk transportation is possible without taking up much space for transportation or storage.

Furthermore, since the U-shaped cage bars can be handled manually, there is no need for cranes or jigs for transporting or lifting them, which, together with the reduction of the above-mentioned construction effort, can result in a good cost reduction. .

*Figures The drawings show embodiments of the present invention; FIG. 1 is an explanatory diagram of the configuration, FIG. 2 is a perspective view of the members used, and FIG. 3 is an enlarged sectional view.

1...U-shaped cage reinforcement, 2...Main reinforcement, 3...Upper stirrup, 4...Column reinforcement, 5...Formwork, 11...
U-shaped stirrup, 12... Auxiliary muscle, 21...
Beam bottom end muscle, 22... Abdominal muscle, 23... Beam top end muscle, 5
1... Column formwork, 52... Beam formwork, 53... Slab formwork, 61... Beam lower end separator, 62... Beam upper end separator.

Claims (1)

[Claims] 1 A plurality of U-shaped stirrups are arranged at a predetermined interval, two parallel auxiliary bars are orthogonally joined at the bottoms of these U-shaped stirrups, and a U-shaped cage bar is pre-assembled to form the U-shaped stirrup. Insert the cage reinforcement into the formwork of the beam, place it on the beam lower end separator that is appropriately placed to ensure the specified concrete cover thickness on the U-shaped cage reinforcement, and then erect the U-shaped cage reinforcement in the specified position. A method for assembling reinforcing bars for beams, which is characterized by assembling main reinforcements such as lower beam reinforcements, abdominal reinforcements, and upper beam reinforcements, upper stirrups, and other necessary reinforcing bars into the cage reinforcements in-situ.