JP2816949B2 - Multi-layer reinforced structure and joining method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure and a joining method of a reinforcing steel frame buried inside a concrete pillar, and more particularly to a double or multiple inner reinforcing bar of a core bar and an outer main bar. The present invention relates to a multi-layered reinforcing bar structure having a multi-layered structure of a reinforcing bar frame and an outer main bar.

[0002]

2. Description of the Related Art Concrete columns used for buildings, piers, etc., have reinforcing bars. As shown in FIG. 5, the reinforcing bars are arranged in parallel along a large outer square. A columnar reinforcing bar frame 1 as an outer peripheral main bar in which adjacent reinforcing bars are bound by a wire 3 or the like called a hoop bar, and a columnar reinforcing bar frame 2 as a core bar formed similarly along a small inner square are inserted. Or consist of a multi-layered reinforced structure.

On the other hand, on a foundation or lower layer 4 of a concrete column, a group of reinforcing bars 5 arranged in the same manner as a multi-layered reinforcing structure is fixedly extended from an underground foundation building section or a lower layer building section. The multi-layered rebar structure and the corresponding rebars in the lower group of rebars are joined with a coupler or screw-con, which is a mechanical joint, or joined by crimping or welding, and the surrounding area is surrounded by a control panel, etc., and concrete is poured inside. To form concrete columns.

[0004] In many cases, a multi-layered reinforcing bar structure is pre-assembled in a factory or the like remote from a construction site as a reinforcing bar pre-assembly method, or pre-assembled in another place of a building site, and a pre-assembled reinforcing bar frame. Was carried to the work site, lifted with a crane, etc., and joined to the foundation or the lower reinforcing steel. However, in the case of a frame assembled in a multi-layer structure, if an attempt is made to join the columnar reinforcing bar frame 2 serving as the center with the reinforcing steel of the foundation or the lower layer, the outer columnar reinforcing bar frame 1 hinders the joining operation. There was a very difficult situation.

[0005] In order to perform this work, conventionally, only the inner columnar reinforcing frame 2 is first lifted by a crane and the lower layer portion 4 is lifted.
And mechanically or welded to the reinforcing bar group 5 in advance. Next, the crane is again operated to lift the outer columnar reinforcing bar frame 1, lower the lower columnar portion so as to cover from above the inner columnar reinforcing bar frame 2, and to provide a mechanical joint (coupler / screw control) 8. Alternatively, it was joined to the reinforcing bar group 5 on the outer periphery by pressure welding or welding.

However, in this method, since the outer and inner columnar reinforcing bars 1 and 2 are separately operated by a crane and lifted and joined each time, a long time is required for the operation. Further, in order to lift the outer columnar reinforcing bar frame 1, it is necessary to lift the outer columnar reinforcing bar frame to a height higher than the inner columnar reinforcing bar frame. Therefore, a large crane is required.

Therefore, as another method, as shown in FIG. 5 (a), the outer columnar rebar frame 1 is lifted by a crane 6 and the inner columnar rebar frame 2 is suspended therebelow by a rope 7 or the like. First, a mechanical joint (coupler / coupler) is used to connect the inner columnar reinforcing bar frame 2 and the
(Screwdriver) 8 or press-welding or welding. After the joining of the columnar reinforcing bar 2 is completed, the rope 7 is removed, the outer columnar reinforcing bar 1 is lowered to the position indicated by the imaginary line, and the reinforcing bar group 5 is mechanically joined (coupler / screw-con) 8 or pressed or welded. The method of joining with has been performed.

[0008]

However, the method of suspending the columnar reinforcing frame 2 below the columnar reinforcing frame 1 requires that the columnar reinforcing frame 1 be lifted at least twice the length of the column. After all, a large crane was required, and work such as installation and removal of the rope 7 took time and labor. SUMMARY OF THE INVENTION An object of the present invention is to solve such a problem, and an object of the present invention is to provide a multi-layered rebar structure which can be easily joined and does not require a large crane, and a joining method thereof.

[0009]

In order to achieve the above object, a multi-layered reinforcing bar structure according to the present invention comprises a plurality of reinforcing bars arranged in parallel and adjacent reinforcing bars bound by wires or the like. Are formed with a plurality of pillars having different thicknesses or widths, and a multi-layer tubular body formed by sequentially inserting small-width ones into large-width ones, and intersecting with the pillar-shaped rebar frame, And a template having a hole through which the reinforcing bar is inserted, and at least one of the reinforcing bars passing through the template of each columnar reinforcing bar frame is provided with a stopper which cannot pass through the hole of the template. is there.

In this case, the stopper of the outermost columnar reinforcing bar may be provided on one side of the template, and the stopper of the other columnar reinforcing bar may be provided on the opposite side of the template. it can. Further, the stoppers that cannot pass through the holes of the template may be provided in such a manner that the stoppers are sequentially displaced stepwise from the outer columnar reinforcing bar frame to the inner columnar reinforcing bar frame having a narrower column width.

[0011] As a method for joining a multilayered reinforcing bar structure of the present invention, a plurality of columnar reinforcing bars formed by arranging a plurality of reinforcing bars in parallel and binding adjacent reinforcing bars with wires or the like are formed with different widths. Then, a multilayer tubular body formed by sequentially inserting small ones into large ones, and a template having a hole through which the intersecting reinforcing bars intersect with the columnar reinforcing bar frame, At least one of the reinforcing bars passing through the template of each columnar reinforcing bar frame is provided with a stopper that cannot pass through the hole of the template,
The stopper is a multi-layered reinforcing bar structure provided in a stepwise manner sequentially from the outer columnar reinforcing bar frame to the inner columnar reinforcing bar frame. Suspended above the reinforcing bar group fixed to the foundation or lower layer part to be joined so as to protrude, joining the innermost columnar reinforcing bar frame and the innermost reinforcing bar group of the mating reinforcing bar, The plate is lowered step by step between the adjacent columnar reinforcing bar frames of the stopper, and the columnar reinforcing bar frame from the inner side to the outer side is sequentially joined to the reinforcing bar group fixed to the foundation or lower layer concrete.

In this case, a stopper for the outermost columnar reinforcing bar is provided below the template, a stopper for the other columnar reinforcing bar is provided above the template, and the multilayer reinforcing structure is connected to the mold. Instead of gripping and suspending the plate, the outermost columnar rebar frame may be gripped and suspended.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of the multilayered reinforcing bar structure of the present invention. The outer columnar rebar frame 1 shown in the figure is the outer main bar in the conventional example, and the inner columnar rebar frame 2 corresponds to the core bar. The multilayer rebar structure of the present invention includes a template 10
And stoppers 11 provided on the columnar reinforcing bars 1 and 2,
12 is characterized.

The template 10 is made of plywood, and has a columnar rebar frame 1,
A large number of holes 14 are formed, which intersect with all of the reinforcing bars constituting 2 and through which each reinforcing bar penetrates. Stopper 11,
Numeral 12 is fixed to a reinforcing bar and has a size that does not pass through the hole 14 of the template 10 and may be any type. In this embodiment, a lock nut or a normal nut to be screwed with the reinforcing bar is used. Uses nuts.

The stoppers 11 and 12 are provided at different distances from the ends of the rebar. Further, the stopper 11 is located below the template 10 and the stopper 12 is located below the template 1.
It comes to the upper side of 0.

Next, a method of joining the multilayered reinforcing bar structure of the present invention to a reinforcing bar group fixed to a foundation or a lower layer will be described. As shown in FIG. 2, first, the upper end of the outermost columnar reinforcing bar 1 is gripped by the crane 6 and lifted by the clamp 13. Initially, the columnar reinforcing frame 1 rises alone without lifting the template 10, but eventually, the stopper 11
Strikes the template 10 from below and lifts the template 10 together. When the template 10 rises, the columnar reinforcing bar frame 2
And starts lifting the columnar rebar frame 2. At this time, as shown in FIG. 2, the lower end of the inner columnar reinforcing bar frame 2 projects downward from the lower end of the outer reinforcing bar 1.

When the mechanical joint (coupler / screw control) 8 at the lower end of the columnar rebar frame 2 rises higher than the rebar group 5 fixed to the lower layer 4, the crane 6 moves the multi-layered rebar structure horizontally. Then, the column-shaped reinforcing bar frame 2 and the reinforcing bar group 5 are brought into a state in which the columnar reinforcing bar frame 2 and the reinforcing bar group 5 can be joined by the mechanical joint (coupler / screw-con) 8. The inner columnar reinforcing bar frame 2 and the reinforcing bar group 5 are joined by a mechanical joint (coupler / screw control) 8, but since the outer columnar reinforcing bar frame 1 is located at a slightly elevated position, it may hinder the joining operation. There is no. It is also possible to perform pressure welding or welding instead of joining using a coupler or a screwdriver that is a mechanical joint.

When this operation is completed, as shown in FIG. 3, the outer columnar rebar frame 1 is lowered by the crane 6 to the same height as the inner columnar reinforcer frame 2 which is the core bar, and the outer columnar reinforcer frame is lowered. The body 1 and the reinforcing bar group 5 of the lower layer part 4 are joined by a mechanical joint (coupler / screw-con) 8 or pressure welding or welding,
The inner and outer columnar rebar frames 1 and 2 are bound by a wire 3 '.

FIG. 4 is a view showing another embodiment, in which the columnar rebar frame 2 has three layers of 2a, 2b, and 2c, and has a four-layer structure including the outermost columnar rebar frame 1. This is an embodiment. The stoppers 11, 12a, 12b, 12c of each of the columnar reinforcing bars 1, 2a, 2b, 2c are attached in a stepwise manner, and are provided at higher positions as they go toward the inner columnar reinforcing bars. With such a configuration, when joining with the reinforcing bar group of the lower layer portion 4, the joining is started from the innermost columnar reinforcing bar frame 2a, and the columnar reinforcing bar frame is lowered one step at a time while the outer columnar reinforcing bar frame 1 is lowered. 2b, 2c, and 1 can be sequentially joined.

In the above embodiment, only the stopper 11 of the outermost columnar rebar frame 1 is located below the template 10,
Stopper 12 of other columnar reinforcing frame 2a, 2b, 2c
Although a, 12b, and 12c are arranged above the template 10, the stopper 11 of the outer columnar reinforcing frame 1 can also be arranged above the template 10. However, in this case, the crane 6 holds the template 10 and suspends the multilayered reinforcing structure.

In the above embodiment, the template 10 has the holes 14 through which all the reinforcing bars constituting the multilayered reinforcing bar structure are inserted. However, the present invention is not limited to such a configuration. That is, it intersects with at least one reinforcing bar of each columnar reinforcing bar frame,
It suffices to provide holes through which only the rebars intersect. Further, although the columnar rebar frame is shown in the embodiment only in the form of a square cylinder, it is needless to say that a closed loop such as a circle, a triangle, or another polygon, a straight line or a curve may be used. In addition,
The width of the columnar reinforcing bar refers to the width or diameter of the columnar reinforcing bar when the cross-sectional shape is a circle, and the width or diameter of the circumscribed circle when the cross-sectional shape is a polygon, curve, or straight line.

[0022]

As described above, according to the present invention, a multi-layered reinforcing bar structure used as a reinforcing bar of a concrete column is fixed to a lower layer portion in order from an inner columnar reinforcing bar frame serving as a core bar. During this joining work, the outer columnar reinforcing bar frame is located above the work site in the suspended position above the work site and does not hinder the joining work of the core bars, so the joining work is easy This has the advantage of requiring only one crane operation. In addition, since the height at which the multilayered rebar structure is lifted is reduced, the size of the crane can be reduced.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of a multilayered reinforcing bar structure of the present invention, wherein FIG. 1 (a) is a view from the line II of FIG. 1 (b), FIG. 1 (b) is a top view, and FIG. FIG.

FIG. 2 is a diagram showing a state in which a columnar reinforcing bar frame inside a multilayer reinforcing bar structure of the present invention is joined to a reinforcing bar group in a lower layer.

FIG. 3 is a diagram showing a state in which an outer columnar reinforcing bar frame of a multilayered reinforcing bar structure of the present invention is joined to a lower reinforcing bar group.

FIG. 4 is a diagram of a multi-layered rebar structure in which a columnar rebar frame is composed of four layers, (a) is a diagram viewed from the IV-IV line of (b),
(B) is a top view.

FIG. 5 is a view showing a conventional multi-layered reinforcing bar structure.
FIG. 7B is a diagram showing a state of joining with a group of reinforcing bars in a lower layer, and FIG. 7B is a top view of the multilayered reinforcing bar structure.

[Explanation of symbols]

1, 2 columnar reinforcing bar frame 2a, 2b, 2c columnar reinforcing bar frame 3 hoop bar, wire 5 lower rebar group 6 crane 7 rope 8 mechanical coupling (coupler / screw control) 10 template plate 11, 12 stopper 12a, 12b, 12c Stopper 13 Clamp 14 hole

Claims (5)

(57) [Claims] 1. A plurality of columnar reinforcing bars formed by arranging a plurality of reinforcing bars in parallel and binding adjacent reinforcing bars with a wire or the like with different column widths. A multi-layered columnar reinforcing bar frame formed by sequentially inserting smaller ones, and a template having a hole that intersects with the columnar reinforcing bar frame and through which the intersecting reinforcing bars are inserted. A multilayer rebar structure, wherein a stopper that cannot pass through a hole in the template is formed on at least one of the rebars passing through the template. 2. The stopper of the outermost columnar reinforcing bar is provided on one side of the template, and the stopper of the other columnar reinforcing bar is provided on the opposite side of the template. Item 4. The multilayer reinforcing bar structure according to Item 1. 3. A stopper which cannot pass through a hole in the template,
A multi-layered reinforcing structure characterized by being provided in a stepwise manner in order from an outer columnar reinforcing bar frame to an inner columnar reinforcing bar frame having a narrower column. 4. A plurality of columnar reinforcing bars formed by arranging a plurality of reinforcing bars in parallel and binding adjacent reinforcing bars with wires or the like with different widths of the columns. A multi-layered columnar reinforcing bar frame formed by sequentially inserting small ones, and a template crossing the columnar reinforcing bar frame and having holes through which the intersecting reinforcing bars are inserted; A stopper that cannot pass through the hole of the template is formed on at least one of the reinforcing bars that pass through the plate, and the stopper is provided stepwise upward from the outer columnar reinforcing bar frame to the inner columnar reinforcing bar frame sequentially. The multilayered rebar structure is suspended above the rebar group fixed to the lower layer to be joined with the innermost columnar rebar frame so that the innermost columnar rebar frame projects downward at the lowest by holding the template, The columnar reinforcing bar frame and the innermost reinforcing bar group of the It is characterized in that the notch plate is lowered step by step between the columnar reinforcing bars adjacent to the stopper, and the columnar reinforcing bars from the inner side to the outer side are sequentially joined to a group of reinforcing bars fixed in the lower layer. A method for joining multi-layered reinforced structures. 5. The stopper according to claim 4, wherein a stopper for the outermost columnar reinforcing bar is provided below the template, and a stopper for the other columnar reinforcing bar is provided above the template.
A method for joining a multi-layered reinforcing structure, wherein the multi-layered reinforcing structure is suspended by gripping an outermost columnar reinforcing bar frame.