JP2522708B2 - Reinforcing bar tip assembly beam with formwork and reinforcing bar tip assembly method with formwork - Google Patents

Description

Description: [Industrial application] The present invention relates to a beam to be erected during construction of a building and a rebar front assembly beam with a formwork and a rebar front assembly method with a formwork involved in the erection work. is there.

[Prior Art] In building construction, a large beam is installed between columns, or
In addition, small beams may be installed between the large beams.

On the other hand, the SRC structure (steel-framed reinforced concrete structure or RC structure (reinforced concrete structure) is often used for the structure of the present building.

Therefore, when building a building with the SRC structure and RC structure, the large beam and the small beam will also be SRC or RC structures.

In the case of using the beam of the conventional SRC structure or the conventional RC structure in such a building, as shown in FIG. 8, after the normal formwork 1 is assembled, the beam reinforcing bars are reinforced and concrete is placed. It is constructed by this (conventional formwork method).

Furthermore, in recent years, due to the shortening of construction period or labor shortage, a building is often constructed using PC (precast) beams 2 as shown in FIG. 9 (PC construction method).

[Problems to be Solved by the Invention] However, the conventional formwork method and PC method have the following problems.

(1) In the conventional formwork method, it is necessary to remove the formwork used in the method, which requires considerable labor.

(2) The problem that the transportation and lifting of the PC beam is often restricted by the carrying capacity of the carrying means and the lifting capacity of the lifting means.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to form a frame rebar front assembly beam and a mold that can reduce the labor required for building a building. The purpose of the present invention is to provide a rebar first assembly method with a frame.

[Means for Solving the Problems] A formwork rebar pre-assembled beam of the invention according to claim 1 has a main bar and a main bar in a formwork forming a bottom surface and both side surfaces of a reinforced concrete beam to be constructed. A pre-assembled rebar for a beam, in which shear reinforcing bars are assembled in advance, is arranged, and the form and the pre-assembled rebar are connected and fixed by a binding material, and convex on at least one of the inner surface and the outer surface of the form. It is characterized by being provided with a section.

Further, the invention according to claim 2 comprises a step of erection of the reinforcing bar pre-assembled beam with formwork according to claim 1 at a predetermined position and fastening both ends of the pre-assembled rebar to a pillar or another beam, A method of constructing a reinforcing bar with a formwork, comprising the step of placing concrete in the formwork, characterized in that the formwork is still left after the concrete is placed.

[Operation] The pre-assembled rebar in the rebar pre-assembled beam with a formwork of the present invention has both ends fastened to columns or other beams, so that a tensile load acting on the formwork-reinforced bar preassembled beam and Bear the shear load.

Since the formwork in the rebar pre-assembled beam with formwork of the present invention is connected and fixed to the pre-assembled rebar by a binding material, it is naturally erected only by fastening both ends of the pre-assembled rebar to columns or other beams. , Support work is unnecessary or reduced. And
Since this formwork is left as it is as a pick-up formwork even after concrete is poured, it does not require dismantling, and therefore the labor of formwork assembling and dismantling work can be reduced as compared with the prior art.

Since the convex portion is provided on at least one of the inner surface and the outer surface of the mold, the rigidity of the mold itself can be increased as compared with the case where the convex portion is not provided. Therefore, less supporting work is required as compared with the conventional formwork method. As a result, the labor required for supporting work can be reduced.

In the PC method, a PC beam is transported and lifted, but since the beam in the present invention is not laid with concrete, the weight of such a beam is smaller than that of the PC method. Therefore, as compared with the prior art, it is possible to reduce the labor required for transportation, lifting, and the like of the beam.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this embodiment are not intended to limit the scope of the present invention to them unless otherwise specified. , It is just an example of explanation.

First, the structure of such a rebar front assembled beam 100 with a formwork of the present embodiment will be described with reference to FIGS. 1 to 3B.

The steel bar formwork 110 with the formwork is provided with a steel plate formwork 110, and the steel plate formwork 110 is arranged in the steel plate formwork 110 with a binding material 400 and a spacer.
It is a beam composed of a front assembly rebar 120 fixedly connected to the steel plate form 110 by 125 (see FIG. 4B).

The steel plate form 110 is of a truss type press system shown in FIGS. 1 and 2 (b). That is, it is a groove-like body having a substantially U-shaped vertical cross-section open to the upper surface, and has both end surfaces opened in the longitudinal direction. On such a side surface, a plurality of substantially triangular protrusions 110a in a side view are provided.
It is provided so that it is upside down with respect to 110a and 110a. A plurality of convex portions 110b having a substantially U-shaped cross section are provided on the lower surface so as to extend in the longitudinal direction of the steel plate form 110.

The front assembly rebar 120 is shown in FIGS. 3 (a) and 3 (b).
As shown in FIG. 5, the upper end stirrup 121, the lower end stirrup 122, the lattice streak 123, and the stirrup 124 are formed.

The above-mentioned upper end muscles 121 and lower end muscles 122 act as main muscles that bear a tensile load, and the lattice muscles 123 and stirrup 124 act as shear reinforcement muscles that bear a shear load.

The truss system shown in FIG. 3 (a) is used in the method of arranging the front-end rebar 120. That is, the upper streak
121 and the lower end streak 122 are arranged in the longitudinal direction of the steel plate form 110, and the upper end stir 121 is located above the opening surface of the steel plate form 110. Also, the lattice muscle 123
On both side surfaces of the steel plate form 110, and stirrup 124 at predetermined intervals in the longitudinal direction of the steel plate form 110 and the upper end streak 1
21, so as to surround the lower end muscle 122 and the lattice muscle 123,
Arranged.

Next, a method of constructing a rebar front assembly with formwork using the above-mentioned rebar front assembly beam 100 with a formwork will be described with reference to FIGS. 4 (a) to 4 (c).

First, the above-mentioned binding metal 4
It is hoisted using 00 and installed on the SRC beam girder 200. Such erection is carried out by the girder-coupling gazette plates 300 attached to both ends of the rebar-front assembled beam 100 with the formwork, as shown in FIGS. 4 (a) and 4 (c). The installation of the girder coupling gazette plate 300 may be carried out at the time of manufacturing the above-mentioned framed reinforcing bar front assembly beam girder 100 or at the site. In addition, such erection is performed when the steel frame of the SRC girder 200 is built. In this embodiment, the girder gusset plate 300 and the binding metal 400 are installed in such an installation.
However, it is not intended to limit the scope of the present invention thereto, and in the present invention, a suspending means suitable for carrying out the present invention can be used.

Then, cast-in-place concrete is placed in the above-mentioned rebar first-assembly beam 100 with a formwork.

And, the steel plate form 110 is still kept even after the concrete is poured. Therefore, when fireproof coating or other footwear is applied to the outer surface of the front reinforcement beam with beam 100, the steel plate frame 110 is buried.

 A building can be constructed by the above steps.

Next, the rebar tip assembly beam 10 with the formwork configured as described above.
The operation and effect of 0 and the reinforcing bar tip assembly method with formwork will be described.

The rebar pre-assembled beam girder 100 with formwork of the present embodiment is erected only by fastening both ends of the pre-assembled rebar 120 to the large beam 200, and therefore, supporting work can be omitted or greatly reduced. Further, since the front braided bar 120 has the upper end bar 121 and the lower end bar 122 which are the main bars, the lattice reinforcement 123 which is the shear reinforcing bar and the stirrup 124, it naturally has excellent tensile strength and shear strength.

In the present embodiment, since the steel plate form 110 is still left after the concrete is poured, the labor for removing the steel plate form 110 can be reduced as compared with the prior art.

Further, the rebar tip assembly beam 100 with the formwork according to the present embodiment is a PC.
Since it is not a beam, the weight of the rebar front assembled beam 100 with the formwork is P
Smaller than C-beam. Therefore, as compared with the related art, it is possible to reduce the labor required for transporting, lifting, and the like of the frame-reinforcing bar pre-assembled beam 100.

Further, since the steel mold is used for the mold according to the present embodiment, plastic mold, wooden mold and others,
Higher strength characteristics than forms other than steel forms.

Since the projections are provided on the outer surface of the steel plate form 110, the rigidity of the steel plate form 110 itself can be increased as compared with the case where no such projections are provided. Therefore, less support work is required compared with the conventional formwork method. Therefore, the labor required for supporting work can be reduced. As a result, the cost required for building a building and the construction period can be reduced.

In addition, the convex portions 110 are formed on both side surfaces and the lower surface of the steel plate form 110.
Since the a and 110b are provided, the steel plate form 110 itself can also resist the bending moment. Further, since the adhesion area with the cast-in-place concrete becomes large, the adhesion force with the cast-in-place concrete can be increased. Furthermore, in the case of performing fireproof coating or other footwear, the adhesive force with the footwear material can be increased.

Further, since the upper end bar 121 is located above the constituent formwork opening surface, when the slab is constructed on the upper surface of the formwork-reinforcing bar pre-assembled beam, the upper end bar 121 is inside the slab.
Since the slab is embedded in the slab, it is possible to integrally form the reinforcing bar front-assembling beam with formwork and the slab.

In the present embodiment, the form-reinforcing bar front-assembled beam 100 is used as the form-reinforcing bar-assembled beam, but the scope of the present invention is not limited thereto, and other beams are included in the present invention. For example, it is possible to use a suitable one for carrying out the present invention, such as a rebar front assembled girder with a formwork.

Of course, when the present invention is applied to a girder, it is needless to say that the pre-assembled reinforcing bar is naturally fastened to the column because the girder is installed between columns.

Further, although the steel plate form 110 is used for the form, it is not intended to limit the scope of the present invention thereto, and in the present invention, other things, for example, steel material form, plywood form, light alloy form,
What is suitable for carrying out the present invention, such as a plastic mold, can be used.

Further, although the truss type press system is adopted as the steel plate form 110, it is not intended to limit the scope of the present invention thereto, and another system in the present invention, for example, FIG.
Also, a suitable method for carrying out the present invention, such as a folded plate method as shown in FIG. 5B, can be adopted.

In addition, the truss method was adopted as the method of assembling the reinforcing bars,
The scope of the present invention is not intended to be limited thereto, and other methods such as the spiral method shown in FIGS. 6 (a) and 6 (b), FIG. 6 (c), and FIG. A method suitable for carrying out the present invention, such as a general method shown in FIG. 6D, can be adopted.

In addition, the above-mentioned SRC large beam 20
Although it was erected in 0, it is not intended to limit the scope of the present invention thereto, and in the present invention, other things, for example, RC large beams
It can be installed in a suitable structure such as 500 for carrying out the present invention. When installing on the RC girder 500, after assembling the form of the connecting girder, as shown in Fig. 7 (a),
This is carried out by erection of the above-mentioned reinforcing bar front-assembled beam 100 with a formwork. Also, as in the case of being installed on the SRC beam girder 200,
The end portion and the intermediate portion of the above-mentioned form-fitted reinforcing bar front-assembled beam 100 are suspended by using a fastener 400 as shown in FIG.

[Advantages of the Invention] Since the present invention is configured as described above, it has the effects described below.

Since it has a pre-assembled rebar composed of a main bar and a shear reinforcing bar, and both ends thereof are fastened to a column or a beam, the tensile strength is naturally excellent, and the supporting work at the time of installation can be omitted or reduced.

Even after the concrete is placed, the formwork is still left in place, so that the work of removing the formwork can be omitted. Therefore, the labor required for building a building can be reduced.

As a result, the cost required for building a building and the construction period can be reduced.

Since the convex portion is provided on at least one of the inner surface and the outer surface of the mold, the rigidity of the mold itself can be increased as compared with the case where the convex portion is not provided. Therefore, less support work is required compared with the conventional formwork method. Therefore, the labor required for supporting work can be reduced. As a result, the cost required for building a building and the construction period can be reduced.

Further, in the PC method, a PC beam is transported and lifted, but since the beam in the present invention is not one in which concrete is cast, the weight of such a beam is smaller than that of the PC method. Therefore, it is possible to reduce the labor required for the transportation and lifting of the beam.

As a result, the cost required for building a building can be reduced.

[Brief description of drawings]

FIGS. 1 to 7 (b) show an embodiment of the present invention. FIG. 1 is a perspective view of a rebar front assembly beam with a formwork, and FIG. 2a is a side surface of a steel plate formwork. Fig. 2 (B) is a vertical sectional view of the steel plate form, Fig. 3 (A) is a side view of the pre-assembled rebar, Fig. 3 (B) is a vertical sectional view of the pre-assembled rebar, and Fig. 4 ( (A) is a side view of the connecting part, Fig. 4 (b) is a vertical cross-sectional view of the suspended rebar front assembly beam with a formwork, and Fig. 4 (c) is a plan view of the connecting part. Fig. 5 (a) is a side view of the folding plate type formwork, Fig. 5 (b) is a vertical sectional view of the folding plate type formwork, and Fig. 6 (a) is a side view of the spiral type pre-assembled rebar. Fig. 6 (b) is a longitudinal sectional view of a spiral type pre-assembled rebar, Fig. 6 (c) is a side view of a general type pre-assembled rebar, and Fig. 6 (d) is a general type of pre-assembled rebar. Longitudinal sectional view, FIG. 7 (a) is a side view of the connecting portion, and FIG. 7 (b) is a vertical sectional view of the connecting portion. Figure and Figure 9 is a side view showing a conventional example. 1 …… Formwork, 2 …… PC beam, 100 …… Reinforcing bar front beam with formwork (reinforcing bar front beam with formwork), 110 …… Steel plate formwork (form), 110a, 110b …… Convex Part, 120 …… Pre-assembled rebar, 121 …… Top bar (main bar), 122 …… Bottom bar (main bar), 123 …… Lattice bar (shear reinforcement bar), 124 …… Star wrap (shear reinforcement bar), 125 …… Spacer, 200 …… SRC girder, 300 …… Girder gusset plate, 400 …… Binder, 500 …… RC girder,

Claims (2)

(57) [Claims] 1. A pre-assembled rebar for a beam, which is a pre-assembled main bar and shear reinforcing bar, is arranged in a formwork as a pickup form forming the bottom surface and both side surfaces of a reinforced concrete beam to be constructed. A rebar pre-assembled beam with a formwork, characterized in that the formwork and the assembling rebar are connected and fixed by a binding material, and a convex portion is provided on at least one of an inner surface and an outer surface of the formwork. 2. A step of erection of a rebar pre-assembled beam with a formwork according to claim 1 at a predetermined position to fasten both ends of the preassembled rebar to a pillar or another beam, and concrete in the formwork. A method for constructing a rebar with a formwork, comprising the step of: placing the formwork, wherein the formwork is still left after the concrete is placed.