JPH0249829A - Previously assembled construction method for large beam steel bar of ferro-concrete structure - Google Patents

Abstract

PURPOSE:To provide practically of executing steel bar installing works in parallel with form setting works by assembling large beam steel bars previously in other place. CONSTITUTION:Ground fabrication of a large beam steel bar unit 1 is first made in a specified place. This unit 1 is assembled by tying a plurality of parallel lower main bars 2 in such a length as extending near a column with a plurality of parallel upper main bars 3 in a length some shorter than the first named bars 2 at certain intervals of tying by the use of a stirrup 4, which surrounds three sides with the top excluded. In the central part of this unit, a sleeve 5 is in advance fitted by mounting the stirrup 4 together with a sleeve reinforcing bar 5. This large beam steel bar unit 1 with the top open is set in a form 7 for beam whose assembly is completed by a wrecker. Then a lower main-bar joint bar 9 on the column side is overlapped over the lower main bar 2 of the large beam steel bar unit 1 and connected, and an upper main-bar joint bar 12 on the column side is coupled with the upper main bar 3 by pressure welding.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a construction method in which girder reinforcing bars of a reinforced concrete building are pre-assembled and jointed with column sides.

[Conventional technology] In this type of conventional construction method, girder reinforcing bar units are assembled on the ground in the east-west direction and in all four directions of the columns like a kite foot, and then dropped into the beam formwork. , the joints with adjacent members are made near the midpoint of the pillars and Tomei.

The column reinforcing bar unit and the beam reinforcing bar unit are assembled separately into a long cylindrical shape in one direction, and the beam reinforcing bar unit is dropped into the beam formwork so that one side crosses the column reinforcing bar unit. The main bars of the beam reinforcement unit are connected to each other.

[Problem to be solved by the invention] In the former case, the ground assembly becomes complicated, and there are troubles such as the need to prepare scaffolding for assembly, and when joining the lower main reinforcement, the formwork gets in the way. Therefore, it will be necessary to simulate a part of the beam side formwork.

In addition, in the latter case, since the hook is passed on one side, when dropping it into the formwork, it is necessary to set the main reinforcement under the beam under the column hoop reinforcement, which makes assembly very difficult. Moreover, like the former method, there is the inconvenience that part of the beam side formwork has to be constructed later when joining the main reinforcement at the bottom of the beam.

Furthermore, in any of the above conventional construction methods, the sleeve and sleeve auxiliary reinforcing bars are attached after setting, which requires time and effort and has problems such as insufficient accuracy.

This invention was devised to solve the above-mentioned conventional problems, and its purpose is to facilitate the joining of girder reinforcing bar units, and to eliminate the need for effort in attaching sleeves and sleeve auxiliary bars. The object of the present invention is to provide a new girder reinforcing bar pre-assembly method for reinforced concrete construction that has sufficient accuracy and eliminates the need for partial post-construction of beam formwork.

[Means for Solving the Problems] This invention according to the above object uses a girder reinforcing bar unit in which the lower stop bar is slightly shorter than the lower stop bar, and sleeves, sleeve reinforcing bars, etc. are attached to stirrups that bind the upper and lower main bars. After pre-assembling at another location and setting the girder reinforcing bar unit in the beam formwork assembled between the columns, connect the bottom stop bars on the column side by overlapping the bottom stop bars of the girder reinforcing bars. The above-mentioned problem is solved by connecting the bottom stop bar joint bar on the column side to the bottom stop bar of the girder reinforcing bar by pressure welding.

[Example 1 Figures 1 and 2 First, the girder reinforcing bar unit 1 is assembled at a predetermined location.

This girder reinforcing bar unit 1 has a plurality of parallel bottom stop bars 2 whose length reaches the vicinity of the column, and a plurality of parallel bottom stop bars 3 whose length is slightly shorter than the bottom stop bars 2 on three sides except the upper part. The sleeves 5 and the sleeve reinforcing bars 6 are attached to the stirrups 4 and pre-assembled in the center of the unit.

FIG. 3 Next, the girder reinforcing bar unit 1 with its top open is set inside the beam formwork 7, which has been assembled by a wrecker.

FIG. 4 After setting, the lower stop bar shimmed muscle 9 is secured from the column 8 side to a required anchoring length S, overlapped with the joint part of the lower stop bar 2, and integrally connected by binding.

In addition, the top bar 10 and second step 611 of the stop bar 3 that spans the column 8 are attached to the top of the unit, and the stop bar joint bar 12 is brought into contact with the end of the stop bar 3 from the column side, and is press-fitted. Join together.

After the connection, the open upper part of the joint part is closed by attaching a stirrup 13, as shown in FIG.

C Effects of the Invention] As described above, this invention pre-assembles girder reinforcing bars at another location, so reinforcing bars can be assembled in parallel with formwork work, reducing labor when assembling beams and slab reinforcing bars. Concentration can be reduced.

In addition, since the sleeve and sleeve reinforcing bars are pre-assembled into a unit along with the girder reinforcing bars, the installation of sleeves, etc. is easier than before, and the accuracy of the installation position is further improved.

Furthermore, neither of the upper and lower main reinforcements penetrate into the columnar reinforcement, so it is easy to set them in the formwork, and the bottom stopper reinforcement is in pressure contact with the column, and the bottom stopper reinforcement is connected to the joint reinforcement. The formwork does not get in the way when connecting, and unlike conventional construction methods, there is no need to encroach on a part of the beam formwork or prepare assembly scaffolding, making construction easier and shortening the construction period. It has many advantages such as being standardized.

[Brief explanation of the drawing]

The drawings show one embodiment of the girder reinforcing bar pre-assembly method for reinforced concrete construction according to the present invention, in which Fig. 1 is a front view of a girder reinforcing bar unit, Fig. 2 is a sectional view thereof, and Figs. 3 and 4 are cross-sectional views. The joining process diagram, FIG. 5, is a sectional view of the joining part. 1... Beam reinforcing bar unit 3... Bottom stop bar 5... Sleeve 7... Beam formwork 9... Bottom stop bar joint bar 10... Top muscle 11... 2nd stage muscle 12... Bottom stop muscle joint muscle 13... Upper stirrup 2... Bottom stop muscle Reinforcement 4... Stirrup 6... Sleeve reinforcing bar 8... Column

Claims (1)

[Claims] The upper main reinforcement is slightly shorter than the lower main reinforcement, and a girder reinforcing bar unit with sleeves and sleeve reinforcing bars attached to the stirrup that binds the upper and lower main reinforcing bars is preassembled elsewhere, and the girder reinforcing bar unit is assembled between the columns. After setting in the beam formwork, the lower main joint reinforcement between the columns is overlapped and connected to the lower main reinforcement of the girder reinforcement, and the upper main joint reinforcement on the column side is connected to the upper main reinforcement of the girder reinforcement by pressure welding. This is a girder reinforcement construction method for reinforced concrete construction.