JPH08135087A - Precast concrete column member and joint method thereof - Google Patents

Abstract

PURPOSE: To strengthen joint in a column and beam joint section of precast concrete column members by simple constitution, make it possible to use then even in the joint section in which a yield hinge is in danger of occurring and, at the same time, to improve productivity. CONSTITUTION: Since a precast concrete column member 10 connects column main reinforcing members 11 to each other in a column and beam joint section, sleeve joints 12 are provided to a column head section 10a positioned to the column and beam joint section. The column main reinforcing bars 11 are projected so that they are inserted in the sleeve joints 12 of a column head section of the other precast concrete column member 10 connected to the column base 10b downward therefrom. An air-vent 13 connected to a joint face of the column head section 10a of the other precast concrete column member 10 connected to the pedestal section is formed in the pedestal section 10b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast concrete column member which is vertically joined at a beam-column joint and a joining method thereof.

[0002]

2. Description of the Related Art For example, when precast concrete column members are vertically joined at column-beam joints when constructing a concrete structure or a mixed structure by a prefabricated construction method, as shown in FIG. In some cases, a precast concrete column member is used in which a column main bar 51 is arranged inside and the column main bar 50a is projected upward from the upper surface of the column head 50a, and a sleeve joint 52 is embedded in the column base 50b. That is, the column main bar 51 of the precast concrete column member 501 that has already been installed is inserted into the sleeve joint 52 of the precast concrete column member 502 that is installed above it, and is provided so as to communicate with the inside of the sleeve joint 52. The air is discharged from the air vent hole 55, and the grout material G is injected from the injection port 53 to fix the sleeve joint 52 and the column main bar 51, and the upper and lower precast concrete column members 501 and 502 are joined.

[0003]

Generally, in a precast concrete column member, since the transmission of stress is discontinuous at the joint surface, there is a fear that the strength of the joint surface may be relatively deteriorated as compared with other portions. In particular, as described above, when this joining method is used in the beam-column joining portion, the column head 50 of the precast concrete column member 501 built downstairs is used.
a is a structural member 5 such as a beam or a floor slab as shown in FIG.
Since the column heads 50a are located at the column-beam joints to which the columns 4 are joined, the column heads 50a are structurally strong. Therefore, when the precast concrete pillar member 502 is joined above the precast concrete pillar member 502, the precast concrete pillar member 502 is separately joined and structurally separated in relation to the beam-column joint.

Therefore, for example, when a horizontal load such as seismic force is applied and a shearing force having an interface at the joint between the precast concrete column members is applied or a moment is generated, the precast concrete column members are joined by this. The so-called yield hinge that causes breakage in the surface, pulling out of the main bar of the column, buckling, etc. is the column base portion 50 of the precast concrete column member 501 built above the column-beam joint.
There is a fear that it tends to occur on the b side.

In particular, when the column main bar is connected to the column base of the precast concrete column member which is installed above the column-beam joint, where the yield hinge is likely to occur, the main bar is not connected at this joint. Since it is continuous, the yield hinge is more likely to occur. Therefore, conventionally, in order to avoid such a problem, for example, it is necessary to take measures such as increasing the amount of rebar, using high-strength concrete, and selecting a joint method with higher strength. There is a fear that not only the structure will become complicated, but also the construction cost will increase accordingly.

Further, in the case of a conventional precast concrete column member in which a sleeve joint is embedded in a column base, when the precast concrete column member is manufactured, the sleeve joint is communicated with the bottom of the formwork forming the precast concrete column member. A pipe that forms an injection port and an air vent hole is provided, and concrete is poured into the formwork from above so as to bury them. At this time, there is a risk that the pipe will fall off the sleeve joint due to the impact that occurs when concrete is poured or concrete is poured.Therefore, when placing concrete, sufficient control is required so that such pipe does not fall off. Not only that, but if it falls off, there is a problem that a large amount of labor is required to restore the concrete because it is necessary to re-place the concrete.

Therefore, the present invention has been made to solve the above problems, and by a simple structure, the precast concrete column members are firmly joined at the beam-column joints, and a yield hinge is likely to occur. With the purpose of providing a precast concrete column member that can be used even with a joint part and a method of joining the precast concrete column member, it is also possible to provide a precast concrete column member with good manufacturability. To do.

[0008]

The precast concrete column member of the present invention is made in order to achieve the above-mentioned object. In the precast concrete column member which is vertically joined at the column-beam joining portion, the column-beam joining is performed. In order to connect the column main bars to each other at the section, a sleeve joint is provided at the column head located at the column-beam joint.

Further, in the precast concrete column member of the present invention, the column main bar inserted into the sleeve joint of the column head of the other precast concrete column member which is joined downward from the column base of the precast concrete column member. It is preferable to project.

Further, in the precast concrete pillar member, an air vent hole may be formed in the pillar leg portion so as to communicate with the joint surface with the pillar head of another precast concrete pillar member joined thereto.

The method for joining precast concrete pillar members according to the present invention is a method for joining precast concrete pillar members together at a beam-column joining portion, wherein the first precast concrete pillar is provided with a sleeve joint on the pillar head. A step of building a member so that the sleeve joint is located at the beam-column joint, and a second precast concrete column member having a column main bar protruding downward from the column base, Inserting into the sleeve joint and installing it above the first precast concrete pillar member, and joining the pillar joint and pillar base of both the sleeve joint and the first and second precast concrete pillar members. And a step of injecting grout material into the surface.

[0012]

According to the precast concrete column member and the joining method thereof of the present invention, the sleeve joint is provided at the column head of the precast concrete column member, and the joint portion of the column main bar to be joined by the sleeve joint is used as a beam or a floor slab. Since it is located in a strong column-beam joint that is firmly constructed by other structural materials such as, the precast concrete column members are joined with sufficient joint strength even if there is a risk of yielding hinges. be able to.

In addition, in the precast concrete pillar member of the present invention, since the sleeve joint is arranged at the head of the pillar, at the time of manufacturing, concrete is placed in the form forming the precast concrete pillar member, and then, The precast concrete pillar member can be manufactured by a step of burying a pipe that forms a sleeve joint and an injection port on the top surface of concrete. Therefore, the pipe does not fall off due to the impact of concrete throwing or placing concrete, and its management is easy. Even if the pipe falls off, the repair work should be performed on the upper part of the formwork. You can

In addition, a column main bar is projected downwardly from the column base of the precast concrete column member, and when the upper and lower precast concrete column members are joined, the other precast concrete column members to be joined are By inserting into the sleeve joint of the pillar head, a plurality of precast concrete pillar members can be easily joined in the vertical direction.

Further, in the precast concrete pillar member, if a bleed hole is formed in the pillar leg portion so as to communicate with the joint surface with the pillar head of another precast concrete pillar member joined thereto, a sleeve joint is formed. When injecting grout material into the inner surface and the joint surface between the pillar head and the pillar base,
Since the air remaining in these can be easily discharged to the outside through the air vent hole, the grout material can be smoothly injected. Also, when the joint surface is completely filled with the grout material, the grout material flows out from the air vent hole, so that it is possible to surely fill the grout material by confirming this.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. 1 and 2 show a precast concrete pillar member 10 according to this embodiment, which is used for constructing a concrete structure or a mixed structure by a prefabricated construction method, for example.

The precast concrete pillar member 10 is
For example, it is manufactured in a factory or the like and is carried into a construction site, and the pillar head 10a is positioned and built in the pillar-beam joint portion 15. In this pillar-beam joint portion 15, the pillar head portion 10a and the upper portion The column bases 10b of the precast concrete column members 10 to be installed are abutted against each other and joined vertically.

As shown in FIG. 1, the precast concrete pillar member 10 has a plurality of pillar main bars 11 vertically arranged therein, and the pillar main bars 11 in the pillar head 10a. The sleeve joints 12 are attached by fitting them to the respective upper end portions of the
At 0b, the column main bar 11 is provided so as to project downward from this. In addition, in the present embodiment, the column base portion 10b includes
An air vent hole 13 that connects the lower surface of the column base portion 10b and the side surface 10c of the precast concrete column member 10 is formed.

The sleeve joint 12 may have the same construction as the conventional one, and the lower side surface of the sleeve joint 12 is formed by a pipe provided so as to penetrate the precast concrete pillar member 10. 12a
Are in communication. When the precast concrete pillar members 10 and 10 are joined, the injection port 12a is used.
A grout material such as a non-shrink mortar or an epoxy resin is injected through the sleeve, and thereby the sleeve joint 12
The column main bar 11 inserted into this is fixed.

Incidentally, such a sleeve joint 12 is a pillar head 1
Since it is disposed at 0a, it can be mounted on the precast concrete pillar member 10 with good positioning accuracy and easily at the time of manufacturing. That is, a formwork (not shown) forming the precast concrete pillar member 10 is assembled, concrete is placed inside the formwork, and the sleeve joint 12 and the injection port 1 are provided on the upper surface of the concrete.
The pipe forming 2a is buried. This sleeve joint 1
Since the work of burying 2 etc. can be done at the top of the form after pouring concrete, the pipe does not drop out due to the impact of concrete injection or concrete pouring, and whether the pipe has fallen off or not In addition to the easy management, even if the pipe falls off, the repair work can be easily performed on the upper part of the mold.

The precast concrete pillar member 10 having the above-mentioned structure, as shown in FIGS. 2 (a) and 2 (b), has the beams 14 and 14 formed by the procedure described below.
It is built while being joined vertically at the beam-column joint portion 15 of.

First, in the downstairs, the first precast concrete pillar member 101 having the above structure is built so that the sleeve joint 12 is located at the pillar-beam joint portion 15.
That is, the first precast concrete pillar member 1
The column head 101a of No. 01 is joined to the surrounding beams 14 and 14 or the floor slab (not shown), and the upper and lower column main bars 11 and 11 are joined.
The joint part is positioned in the strong beam-column joint 15.

Then, the second precast concrete pillar member 102 is replaced with the precast concrete pillar member 101.
The column main bar 11 is installed above the above while inserting it into the sleeve joint 12. At this time, the first and second precast concrete pillar members 101 and 102 installed above and below are provided with a space in the joint surface between the pillar heads 101a and the pillar bases 102b with a spacer or the like, and around this area. The joint seal frame 16 is arranged to provide a grout injection space S for injecting the grout material.

After the installation work of the second precast concrete pillar member 102 is completed, then the injection port 1
The grout material is injected into the inside of the sleeve joint 12 and the grout injection space S via 2a. For the grout material injection work, a conventional injection means such as a manual press-fitting gun can be used.

Here, during the grout injection work,
Column base 102 of precast concrete column member 102
An air vent hole 13 that communicates with the grout injection space S is provided in b.
Is formed, through which the sleeve joint 1
2 and the air remaining in the grout injection space S can be easily discharged to the outside. Further, when the grout material is filled in the sleeve joint 12 and the grout injection space S, the grout material flows out from the air vent hole 13,
By checking this, it is possible to reliably fill the grout material. And after the grout material hardens,
The joint seal frame 16 is removed, and the joining work of the precast concrete pillar member 50 is completed.

In the precast concrete column member 10 built in this way, the column-to-column joint in which the joint portion of the column main bar constituted by the sleeve joint 12 is firmly fixed by a beam or another structural material such as a floor slab. Since it is located at the portion 15, the precast concrete pillar members can be joined to each other with sufficient joining strength even at the joining portion where the yield hinge may occur.

[0027]

As described in detail above, according to the precast concrete column member and the joining method thereof of the present invention, the joint portion of the column main bar constituted by the sleeve joint is used for other structures such as beams and floor slabs. Since it is located in the strong column-beam joint that is firmly constructed by the material, it does not complicate the structure of the joint, and it joins with sufficient joint strength even if there is a risk that yield hinge will occur be able to.

In addition, in the precast concrete pillar member of the present invention, since the sleeve joint is arranged at the head of the pillar, when the precast concrete pillar member is manufactured, concrete is placed in the form forming the precast concrete pillar member. It is possible to bury the pipes that will later form the sleeve joint and the inlet etc. Therefore, the pipe does not fall off due to the impact of concrete injection or concrete placement, its management is easy, and even if the pipe falls off, it can be easily repaired. Can be improved.

If the column main bar of the precast concrete column member is projected downwardly from the column base, and is inserted into the sleeve joint of the column head of another precast concrete column member to be joined. A plurality of precast concrete pillar members can be easily joined in the vertical direction.

Further, in the precast concrete pillar member, if air vent holes are formed in the column bases, when the grout material is injected, the air remaining therein can be easily discharged to the outside through the air vent holes. Therefore, the grout material can be smoothly injected. Also, when the joint surface is completely filled with the grout material, the grout material flows out from the air vent hole, so that it is possible to surely fill the grout material by confirming this.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a precast concrete pillar member according to an embodiment of the present invention.

2 (a) and 2 (b) are explanatory views showing a work procedure for joining a precast concrete pillar member according to an embodiment of the present invention at a beam / column joining portion.

FIG. 3 is a vertical cross-sectional view showing a state in which a conventional precast concrete column member is joined at a beam-column joining portion.

[Explanation of symbols]

 10 Precast Concrete Column Member 10a Column Head 10b Column Base 11 Column Main Bar 12 Sleeve Joint 13 Air Bleed Hole 15 Column Beam Joint

Claims (4)

[Claims] 1. In a precast concrete column member that is vertically joined at a beam-column joint, a sleeve joint is provided at a column head located at the beam-column joint in order to connect column main bars to each other at the beam-column joint. A precast concrete pillar member characterized by being provided. 2. The precast concrete pillar member according to claim 1, wherein the sleeve joint of the pillar head of another precast concrete pillar member is joined to the pillar leg portion downward from the pillar leg portion. A precast concrete column member characterized in that a column main bar to be inserted into the column is projected. 3. The precast concrete pillar member according to claim 2, wherein an air bleed is communicated with a pillar base portion of the precast concrete pillar member at a joint surface with a pillar head portion of another precast concrete pillar member joined thereto. A precast concrete pillar member having a hole formed therein. 4. A method for joining precast concrete column members together at a beam-column joint, comprising: a first precast concrete column member having a sleeve joint on a column head, wherein the sleeve joint is the column-beam joint. And a second precast concrete column member having a column main bar projecting downward from the column base, the column main bar is inserted into the sleeve joint, and the first precast concrete column member is inserted into the sleeve joint. And a step of injecting grout material into the joint surface between the column head and the column foot of both the sleeve joint and the first and second precast concrete column members. A method for joining precast concrete column members, characterized by: