JP2766770B2 - Reinforcement joint method and precast reinforced concrete beam-column connection 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 a reinforcing bar, and more particularly to a method of joining a reinforcing bar protruding from a precast reinforced concrete member and a method of joining a precast reinforced concrete beam to a column.

[0002]

2. Description of the Related Art In recent years, many buildings have been constructed of precast reinforced concrete members in order to promote labor-saving construction and shortening the construction period due to the extreme shortage of labor in recent years. In building a building with this precast reinforced concrete member, joining of the precast reinforced concrete members is very important, and this joining is performed by joining reinforcing bars projecting from the precast reinforced concrete members and casting concrete at the joint. I have. Conventionally, as a method of joining the reinforcing bars, a pressure welding joint method, a welding joint method, a mechanical joint method, and the like are used.

[0003]

However, the above-mentioned press-welding method and welding method are both susceptible to the weather because they require welding, and they need to be wide because they cannot be constructed where the spacing between members is small. Yes, it may depart from the intended purpose of the precast member. In addition, mechanical joints have a problem that the workability is poor in the case of a horizontal member such as a beam material, and all of the above methods require construction by a specialized trader and have a problem that the construction unit price is high. The present invention has been made in view of the above-described problems, and an object of the present invention is to easily and economically perform a joint of a reinforcing bar in a precast reinforced concrete member without being affected by the weather, and without depending on a specialist. .

[0004]

According to the present invention, there is provided a joint method for a reinforcing bar, comprising: a reinforcing bar having a bent bar having a bent end, with the bent bar facing each other. The bending pipe is covered with a restraining pipe, the lower part of the restraining pipe is positioned below the bending muscle, and the restraining pipe is filled with non-shrinkable grout. A notch groove for inserting a reinforcing bar was provided in the portion, and a reinforcing tube was fitted in the lower end portion to form a configuration. The method of joining precast reinforced concrete beams to columns is as follows: the end of the precast reinforced concrete beam is placed on the beam erection jaw of the column, and the bending bars of the lower main bar protruding from the cut edge and the connecting bars protruding from the column Abutting the bending muscles above the beam erection jaws, placing a restraining tube over these bending muscles, positioning the lower part of the bending muscles below the bending muscles, and inserting a non-shrink grout into the restraining tubes. After filling, concrete is cast on the upper surface of the precast reinforced concrete beam and the joint between the beam and the column, and the restraining pipe is provided with a cutout groove for inserting a reinforcing bar at a lower end, and a lower end. A reinforcing tube is fitted to the second member.

[0005]

[Function] In the rebar joint method, the lower part of the restraining pipe is positioned below the bending line and the non-shrinking grout is filled therein, so that the restraining pipe restrains the non-shrinking grout and the non-shrinkage grout. The grout is constrained around the bend. Therefore, when a tensile force acts on one of the reinforcing bars, the opposing bent bars try to move in the direction away from each other, but the non-shrinkage grout inscribed in the curved portion of the bent bar restricts the behavior of the reinforcing bars. A compression band occurs in the shrink grout. The reaction force generated by the compression band acts on the inner surface of the constraining tube so as to push the same, so that a tensile force acts on the constraining tube. The reaction force of the tensile force of the restraint tube becomes a compression band generated on the inscribed surface of the non-shrinkage grout of one of the curved portions of the reinforcing bar. As a result, the tensile force of one rebar is transmitted to the other rebar as a tensile force. In addition, since the reinforcing pipe is fitted to the lower end of the restraining pipe located at the bent portion of the bending muscle, the restraining force of the opposing reinforcing steel is further increased. In addition, even without this reinforcing tube, by increasing the strength of the constraint tube, the constraint of the non-shrinkage grout can be effectively performed. In addition, in the method of joining a precast reinforced concrete beam to a column, a reinforcing pipe was attached to a bending line of a lower main bar of the precast reinforced concrete beam and a bending line of a connecting bar of a column by placing a restraining pipe above a jaw for beam erection. By doing so, these rebars can be easily joined without relying on a specialized contractor, and the restraining force is as strong as the above-described rebar joint method, and the restraining force is reduced by the reinforcing pipe at the lower end of the restraining pipe. Further enhanced.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a joint method of a reinforcing bar and a method of joining a precast reinforced concrete beam to a column according to the present invention. FIG. 1 is a cross-sectional view showing a method of joining reinforcing bars between precast reinforced concrete beams,
FIG. 2 is a plan view of the same, FIG. 3 is an enlarged sectional view of a joint, FIG. 4 is a sectional view of precast reinforced concrete beams joined to each other,
(1) and (3) of FIG. 5 are cross-sectional views of the restraint tube, and (2) is a plan view of the same.

A precast reinforced concrete beam (hereinafter referred to as a PCa beam) 1 shown in FIG. 1 has stirrups 2 projecting from the upper surface and lower main reinforcing bars 3 projecting from the front end of the tip. It is provided with a bent line 3a which is bent every time.

[0008] Such a PCa beam 1 is placed on a flat surface with the cut-out surface facing, and the bent bars 3a of the lower reinforcing bar 3 projecting from the cut-out surface are butted, and the butted bent bars 3a are joined.
a is covered with a restraining tube 4 from above. In addition to the butting lines 3a, they can be overlapped and joined.

At this time, as shown in FIG. 3 and FIG. 5, the lower main reinforcing bar 3 is inserted into the notch
And the lower part of the restraining tube 4 is positioned below the bending line 3a. Then, the non-shrinkable grout 6 is filled in the restraining tube 4 surrounding the bending line 3a, and the bending line 3
However, the bent portion 3b is also restrained because the lower part of the restraining tube 4 is located below the bending line 3a.

Therefore, as shown in FIG. 6, when a tensile force acts on the lower main bar 3, the bending bars 3a tend to separate from each other, but are surrounded by the non-shrink grout 6 which is restrained by deformation by the restraining tube 4. A compression resistance acts on the curved portion 3b of the bending line 3a, and a tensile force acts on the restraining tube 4 as a reaction force of the compression force. Thereby, the lower main muscle 3a (tensile force) -non-shrinkable grout 6 (compressive force) -restraining pipe 4 (tensile force) -non-shrinkable grout 6 (compressed) through the non-shrinkable grout 6 surrounding the curved portion 3b. (Force) -stress of lower main bar 3a (tensile force) is transmitted.

After joining the lower main reinforcing bars 3 of the PCa beam 1 in this way, as shown in FIG. 4, concrete 7 is cast on the upper surface of the PCa beam 1 and the joint thereof to be integrally joined.

FIG. 7 shows a reinforcing pipe 8 fitted to the lower part of the restraining pipe 4, and the reinforcing pipe 8 has cutout grooves 5a and 5b for inserting a reinforcing bar in the same manner as described above. Thus, the reinforcing pipe 8
The restraining force at the bent portion 3b of the bending line 3a can be increased by the provision of.

FIG. 8 shows the restraining tube 4 in which the reinforcing tube 8 having the bottom cover 11 is fitted. The non-shrinkable grout 6 in the restraining tube 4 is prevented from flowing out by the bottom cover 11. Things.

As shown in FIG. 9A, the reinforcing pipe 8 having the bottom lid 11 is set on the beam erection 13 in advance, and the reinforcing pipe 8 is attached to the lower part of one of the beams. The main reinforcement 3 is fitted into one of the insertion holes 5 a of the reinforcing tube 8.
Then, as shown in (2) of FIG.
The lower main reinforcement 3 is placed on the beam erection jaw 13 so as to fit into the other insertion hole 5 b of the reinforcing pipe 8. And this reinforcement pipe 8
The restraining tube 4 is inserted from above, and the main bar 3 is fitted into the insertion hole 5 and fitted. Further, the constraining tube 4 is not limited to a flat rectangular shape as described above, and may have a shape as shown in (1) and (2) of FIG.

[0015] The method of joining the reinforcing bars is as described above.
Not limited to the reinforcing bars between the Ca beams 1, for example, PCa beams and PCa
The present invention can also be applied to the case of a reinforcing bar such as a wall or a PCa beam and a PCa floor.

Next, a method of joining the PCa beam and the column will be described. As the PCa beam 1 and the restraining pipe 4 used in this joining method, the same ones as described above are used.
As shown in FIG. 1, the end of the PCa beam 1 is placed on the beam receiving jaw 13 at the head of the column 12, and the bending line 3 a of the lower main bar 3 and the bending line 14 a of the connecting bar 14 protruding from the column 12. Are opposed to each other above the beam receiving jaw 13 and butted against each other. In this case, a space is appropriately provided between the strip 10 of the column 12 and the end of the PCa beam 1.

Then, as shown in FIG. 12, a restraining tube 4 is placed over the butted streaks 3a and 14a, and a non-shrinkable grout 6 is filled in the restraining tube 4 to bind them. In this case, use the same restraining tube 4 as above,
The restraining force of the bending lines 3a and 14a is strengthened by the restraining tube 4.

After the bending bars 3a and 14a are constrained in this way, as shown in FIGS. 13 and 14, concrete 7 is cast from the upper surface of the PCa beam 1 to the column 12, thereby forming the PCa beam 1. The column 12 is integrally joined.

In this embodiment, the columns are cast-in-place concrete columns. However, the columns can also be applied to PCa columns.
In the case of this PCa column, since the bending line 3a is formed outside the column surface, a PCa column manufactured integrally with columns of a plurality of floors can be realized. As a result, it is possible to achieve a short construction period equivalent to that of a steel-frame building. In addition, joint portions between the column PCa members can be significantly reduced, and at the same time, complicated column and beam panel sections can be constructed at the factory.

[0020]

According to the present invention, the restraining tube is placed on the bending line such that the lower portion thereof is located below the bending line, and the non-shrinkable grout is filled therein. The bent bars try to separate from each other, but the deformation of the surrounding non-shrinkage grout or the like is suppressed by the restraining tube, so that the reinforcing bars cannot be separated and are strongly restrained.

Since the notch groove for inserting the reinforcing bar is provided at the lower portion of the restraining tube, when the bending tube is covered with the restraining tube, the reinforcing bar is inserted into the notch groove and the restraining tube can be made independent.

Since the reinforcing pipe is fitted to the lower part of the restraining pipe and reinforced, the most fragile portion of the non-shrinkable grout can be strengthened.

[0023] By placing a restraining pipe above the jaw or formwork for erection of the beam at the lower main bar of the precast reinforced concrete beam and the bending bar of the connecting bar at the column, the gap between the beam end and the side of the column is formed. Can join the rebar with
Anyone can perform the joining operation easily and economically without relying on a specialist.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a method of joining a reinforcing bar of a PCa beam.

FIG. 2 is a plan view showing a method of joining a reinforcing bar of a PCa beam.

FIG. 3 is an enlarged sectional view of a joint portion of a PCa beam.

FIG. 4 is a sectional view in which PCa beams are joined.

FIGS. 5 (1) and (3) are cross-sectional views of a restraining tube, and (2) is a plan view of the restraining tube.

FIG. 6 is a cross-sectional view of a constraining pipe showing stress when a tensile force acts on a reinforcing bar.

FIGS. 7 (1) and (2) are cross-sectional views of a restraining pipe having a reinforcing pipe fitted to a lower portion.

FIGS. 8A and 8B are cross-sectional views of a restraining tube having a bottom lid.

FIGS. 9 (1) and (2) are perspective views of a reinforcing pipe having a bottom lid for fitting a restraining pipe.

FIGS. 10A and 10B are plan views of constraint tubes having different planar shapes.

FIG. 11 is a cross-sectional view showing a method of joining a PCa beam and a column.

FIG. 12 is a plan view of FIG. 10;

FIG. 13 is an enlarged sectional view of a joint.

FIG. 14 is a sectional view in which a PCa beam and a column are joined.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 PCa beam 2 Stirrup 3 Lower main bar 3a, 14a Bending line 4 Restriction tube 5 Notch groove 6 Non-shrinkage grout 7 Concrete 8 Reinforcement tube 12 Column 13 Beam receiving jaw 14 Connecting bar

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E04G 21/12 105

Claims (6)

(57) [Claims] 1. A reinforcing bar having a bent bar whose tip is bent is abutted with the bent bars facing each other, a restraining tube is placed over these bent bars, and the lower part thereof is lower than the bent bars. Characterized in that the non-shrinkable grout is filled in the constraining tube positioned on the side. 2. The method according to claim 1, wherein the restraining pipe has a cutout groove at a lower end for inserting a reinforcing bar. 3. The restraining pipe has a reinforcing pipe fitted at a lower end thereof.
2. The method according to claim 1, wherein a notch groove for inserting a reinforcing bar is provided in the reinforcing pipe. 4. An end portion of a precast reinforced concrete beam is placed on a beam erection jaw of a column, and a bending line of a lower main bar projecting from the front end of the beam and a bending line of a connecting bar projecting from the column are connected to the beam. Abutting the upper part of the erection jaw in an opposing manner, covering these bending streaks with a restraining tube, positioning the lower part thereof below the bending streaks and filling the restraining tube with non-shrinkable grout, and then precast reinforced concrete A method for joining a precast reinforced concrete beam and a column, wherein concrete is cast on an upper surface of the beam and a joint between the beam and the column. 5. The method for joining a precast reinforced concrete beam and a column according to claim 4, wherein the restraining pipe is provided with a cutout groove at a lower end portion for inserting a reinforcing bar. 6. The restraining tube has a lower end fitted with a reinforcing tube,
The method for joining a precast reinforced concrete beam and a column according to claim 4, wherein a cutout groove for inserting a reinforcing bar is provided in the reinforcing pipe.