JP2867878B2 - Reinforcing bar vertical bar joining method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of joining vertical bars when assembling a reinforcing bar by vertically connecting a reinforcing bar cage and a reinforcing bar cage.

[0002]

2. Description of the Related Art As joints of reinforcing bars, there are "lap joints" in which ends of reinforcing bars are overlapped and joined together, and "weld joints", "crimp joints" in which ends of reinforcing bars are joined together.
“Threaded joints” and the like are known.

[0003]

Although the above-mentioned various joints have advantages and disadvantages, there is no particular problem when reinforcing bars are joined one by one.

[0004] However, the following problem arises when assembling a reinforcing steel cage by connecting the reinforcing steel cages to each other in a form in which the reinforcing steel bars are assembled three-dimensionally to form a reinforcing steel cage.

(1) The case of "lap joint".

[0006] As the size of the structure increases, the diameter of the reinforcing bar used also increases, and accordingly, it is necessary to increase the length of the lap joint. For example, in the case of a reinforcing bar having a diameter of 51 mm, the lap joint length is 2 m.
In addition, if the lap joints are alternately displaced according to the regulations, the joint portion extends over a range of about 5 m, and workability is extremely deteriorated.

(2) In the case of a "butt joint".

[0008] When the reinforcing bars are assembled three-dimensionally to form a reinforcing bar cage, it is unavoidable to cause an error in the arrangement position of the reinforcing bars, so that dozens of vertical bars are all placed at the correct positions. It is almost impossible to do. For this reason, it is almost impossible to match the positions of the upper and lower ends of the vertical bars of the reinforcing bars to be joined at the same time for all the vertical bars. Therefore, it is difficult to adopt the reinforcing bars in the connection of the reinforcing bars.

[0009]

SUMMARY OF THE INVENTION The present invention aims at joining by a simple operation by using a trumpet type sleeve tube having a cylindrical lower portion but having a funnel-shaped upper portion as a sleeve tube in a crimp joint. This problem is solved by performing alignment of all the vertical streaks.

That is, according to the present invention, the lower cylindrical portion of the trumpet-type sleeve tube is fitted and fixed to the upper ends of a number of vertical bars of the already installed reinforcing bar, and the next reinforcing bar is lowered from above to reinforce the reinforcing bar. This is a method of joining reinforcing rod vertical bars, which comprises inserting the lower ends of a number of vertical bars of a cage into a sleeve tube, and then squeezing the sleeve tube with a die and pressing the sleeve tube to the vertical bars.

The gist of the present invention is that the lower ends of the vertical bars of the reinforcing bar cage which are to be joined to the upper ends of the vertical bars of the existing reinforcing bar cages which are to be joined to the wrapper-type sleeve tubes are merely aligned roughly. Is that the steel cage can be easily set.
The lower end of the vertical bar of the upper reinforcing rod cage set only by the rough alignment slides on the funnel portion of the trumpet-type sleeve tube by its own weight and settles in a proper position. The error in the arrangement position of the vertical bars generated at the time of assembling the reinforcing bars is absorbed by the free length movement and bending of the vertical bars, and the lower ends of all the vertical bars of the reinforcing bars to be joined are simultaneously settled at the regular positions. Thereafter, as usual, the sleeve is squeezed with a die and the vertical bars are joined to each other by crimping.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a part of a reinforced cage, showing a construction procedure according to an embodiment of the present invention. FIG. 2 is a process vertical sectional view of each vertical streak joint.

The construction procedure of the present invention will be described with reference to the drawings.

(1) The cylindrical portion of the trumpet type sleeve pipe 4 is fitted to the upper ends of all the vertical bars 2A of the existing reinforcing bar cage 1A, and caulked and fixed. (FIG. 1 (a)) (2) The lower ends of all the vertical bars 2B are made to coincide with the funnel portion of the trumpet type sleeve tube 4 while suspending and lowering the next rebar basket 1B to be joined. The suspended support is released, and the steel cage 1B is lowered by its own weight. The lower end of the vertical bar 2B slides down the funnel portion of the flared sleeve tube 4 and descends to a regular position. (FIGS. 1 (b) and 2 (a)) (3) The wrapper-type sleeve tube 4 is squeezed from the periphery with a die 5 and pressed against the vertical bars 2A and 2B. This crimping is performed on all the vertical bars 2A and 2B, and the reinforcing bar 1A and the reinforcing bar 1
The joining with B is completed. (FIG. 1 (c), FIG. 2 (b), FIG. 2 (c))

[0016]

According to the present invention, by using a trumpet-type sleeve tube having a cylindrical shape at the lower portion but having a funnel shape at the upper portion as the sleeve tube, it is possible to simultaneously position all the vertical bars to be joined. It is now possible to assemble the rebar by joining the rebar cages with crimp joints. As a result, the efficiency of assembling the rebar is improved.

[Brief description of the drawings]

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a process perspective view showing a construction procedure of the present invention and illustrating a part of a reinforcing bar cage.

FIG. 2 is a process vertical sectional view of each vertical streak joint.

[Explanation of symbols]

1A, 1B, reinforced cage, 2A, 2B, vertical bar, 3A,
3B horizontal streaks, 4 trumpet type sleeve tubes, 5 dice.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E04C 5/18

Claims (1)

(57) [Claims] 1. A lower cylindrical portion of a trumpet-type sleeve tube is fitted and fixed to the upper ends of a number of vertical bars of an already installed reinforcing bar, and the next reinforcing bar is lowered from above to form a plurality of reinforcing bars. A method of joining vertical bars of a reinforcing cage, comprising inserting a lower end of a vertical bar into a sleeve tube, and then squeezing the sleeve tube with a die and pressing the sleeve tube to the vertical bar.