KR20120091934A - Method for connecting between precast concrete columns in construction layer using headed reinforcement - Google Patents

Abstract

PURPOSE: A floor portion connecting method of a precast concrete column using head steel bars is provided to improve the construction processes effectively and economically through head steel bars. CONSTITUTION: A floor portion connecting method of a precast concrete column using head steel bars is composed as follows. Some portion of a main bar is exposed to cope with the length of the joint of the mid-portion between floors and the other portion is cut. The main bars exposed on an upper column and a lower column are arranged not to be overlapped(S10). The upper column and the lower column are arranged in a joining portion and attached to the end portion of a column(S20). The exposed main bar is fastened through a shear reinforcement bar(S30). Forms are installed in the joining portion(S40). Concrete is poured and cured in the joining portion enclosed by the forms(S50). The forms are removed after the curing is complete.

Description

METHOD FOR CONNECTING BETWEEN PRECAST CONCRETE COLUMNS IN CONSTRUCTION LAYER USING HEADED REINFORCEMENT}

The present invention relates to an interlayer joint method of a precast concrete column using head reinforcement, and more particularly, an upper column and a lower column in an interlayer intermediate part in which a member force of a building is zero when using a precast concrete column. In the precast concrete column using the head reinforcement which strengthens the binding force with the pour concrete using the head reinforcement while joining the lower column and the upper column by dry method while the exposed main bars are not overlapped with each other. It relates to an interlayer intermediate joint method.

In buildings constructed with reinforced concrete methods, a method of shortening air while improving precision by joining concrete members, that is, precast concrete members, which have been recently produced at the factory in the construction site, alone or in the existing dry type It is carried out in parallel with the construction method.

Among such a method of connecting the precast concrete members to each other, splice sleeves are mainly used for joining of precast concrete columns and columns.

The splice sleeve is used in a method in which the main root is exposed at one of the pillars and the splice sleeve is embedded at the other pillar to insert the main root in the splice sleeve, and then fill and integrate the mortar in the main root and the sleeve. .

However, since the splice sleeve is very expensive, it acts as a factor to increase the construction cost, and the filling process is required in the sleeve after the joint is placed and the inconvenience of preforming the filling passage in the precast concrete column for each sleeve for such filling There was this. In addition, the splice sleeve has a problem that it is difficult to cope with the error when the design error and construction error for the placement of the exposed main root.

In addition, the joint of the conventional precast concrete pillar, was performed by a method of integrating with the beam in the vicinity of the joining of the column and the beam mostly. However, the connection between the column and the beam is a part where the stress is concentrated. For this, a large amount of reinforcing bars are used to reinforce the reinforcement of the reinforcing bars. Careful attention was required to ensure.

The present invention is to solve the above problems, the object of the present invention is to improve the economics by using the head reinforcement, the filling process can be omitted, and the head reinforcement that can easily cope with design and construction errors It is to provide an interlayer intermediate joint method of precast concrete columns.

Another object of the present invention is to provide an interlayer intermediate joint method of a precast concrete column using head reinforcement which can reduce the amount of reinforcement while being able to resist the member force acting by joining in the interlayer intermediate portion where the member force is not applied.

According to a feature of the present invention for achieving the above object, the present invention relates to the interlayer intermediate joint method of the precast concrete pillar using the head reinforcement,

According to the interlayer intermediate joint method of the precast concrete column using the head reinforcement according to the present invention, the use of the head reinforcement can improve the economical efficiency, omit the filling process, and can easily cope with design and construction errors, In addition, it has the effect of achieving air shortening and economic feasibility.

In addition, according to the present invention, by joining in the interlayer portion where the member force does not work, while reducing the amount of reinforcement while being able to resist the member force acting as well as to improve the seismic performance than the column joint at the beam-column joint surface There is an advantage in that construction cost can be reduced and construction performance can be improved by reducing the amount of reinforcement.

1 is a flow chart for a first embodiment of the interlayer intermediate joint method of the precast concrete pillar using the head reinforcement according to the present invention,
2 is a conceptual diagram showing the reinforcement state of the upper pillar,
3 is a cross-sectional view taken along line AA ′ of FIG. 2;
4 is a conceptual diagram showing the reinforcement state of the lower pillar,
5 is a cross-sectional view taken along line BB ′ of FIG. 4;
6 is a conceptual diagram illustrating a state in which an upper pillar and a lower pillar are connected according to the first embodiment;
7 is a flow chart for a second embodiment of the interlayer intermediate joint method of the precast concrete pillar using the head reinforcement according to the present invention,
8 is a conceptual diagram showing the reinforcement state of the upper pillar,
9 is a cross-sectional view taken along the line CC ′ of FIG. 8;
10 is a conceptual diagram showing the reinforcement state of the lower pillar,
11 is a cross-sectional view taken along the line D-D 'of FIG. 10;
12 is a conceptual diagram illustrating a state in which an upper pillar and a lower pillar are connected according to the second embodiment.

Hereinafter will be described with reference to the accompanying drawings for the interlayer intermediate joint method of the precast concrete pillar using the head reinforcement according to the present invention.

≪ Embodiment 1 >

1 is a flowchart illustrating a first embodiment of an interlayer intermediate joint method of a precast concrete column using a head reinforcement according to the present invention, FIG. 2 is a conceptual diagram illustrating a reinforcement state of an upper column, and FIG. 4 is a cross-sectional view taken along line A-A ', and FIG. 4 is a conceptual view illustrating a reinforcement state of the lower pillar, and FIG. 5 is a cross-sectional view taken along line B-B' of FIG. 6 is a conceptual diagram illustrating a state in which an upper pillar and a lower pillar are connected according to the first embodiment.

In the main rods 11 and 21 used in the present invention, the main rods 11 and 21 exposed from the precast concrete column are composed of the head bars 13 and 23.

The original designations of the head bars 13 and 23 are also called headed reinforcement, also called mechanical reinforcement. This is a device in which a circular or rectangular plate is joined to the end of a general reinforcing bar by bolts or welding, and is mounted through a bearing force applied to the plate.

Advantages of the head reinforcing bars 13 and 23 are, first of all, the restraining effect at the joint part is improved and the slip of the reinforcing bar can be reduced. Detailed reinforcement design is possible and shows satisfactory seismic performance. It also prevents densification of rebar, reduces reinforcement periods and costs, and enhances concrete performance.

In the present invention, in the joint of the precast concrete column and the column, a non-contact overlapping joint using the head bars 13 and 23 is used with the joint position at the middle part of the floor having the least member force.

In more detail, the present invention, in the method of joining the precast concrete pillar in the interlayer middle portion, first exposed some of the main bar (head reinforcing bar) corresponding to the length of the junction 30 of the interlayer middle part and the remaining main bar ( Ordinary reinforcing bar) is cut, but the main pillars 10 and 21 exposed from the upper pillar 10 and the lower pillar 20 to be joined at the interlayer middle portion is disposed in a position not overlapping each other. The main bars 11 and 21 to be cut here may be used as the general reinforcing bar 15, and the precast concrete columns are manufactured with the shear reinforcing bars 17 and 27 installed around the main bars 11 and 21.

In this case, the number of the main roots exposed is preferably 1/2 of the number of the main roots 11 and 21 disposed on the upper pillar 10 or the lower pillar 20. That is, eight main roots 11 and 21 are disposed at each corner of the rectangular cross section and at the middle of each corner of the upper pillar 10 and the lower pillar 20, respectively. The main root 21 disposed at each corner of the exposed portion, the upper pillar 10 is exposed to the main root 11 disposed in the middle of the corner.

In addition, the length of the exposed main roots (11, 21) is in the range of approximately 40 to 50 times the thickness of the main root, the main roots (11, 21) exposed from the upper pillar 10 or the lower pillar 20 It is preferable that 1/2 point in the length of correspond to 1/2 point in the interlayer height (step S10).

In addition, the upper pillar 10 and the lower pillar 20 are aligned with the junction 30 and positioned close to the exposed surface of the pillar facing the ends of the exposed main roots 11 and 21. Here, since the exposed main bars 11 and 21 are made of head bars 13 and 23, heads 13a and 23a of the head bars 13 and 23 are positioned at the exposed ends to expose the surface of the pillar. Are placed in close proximity. At this time, the head 13a, 23a of the head reinforcement is close to the exposed surface of the pillar also includes a case of being in close contact (step S20).

The outer peripheries of the main roots 11 and 21 exposed from the upper pillar 10 and the lower pillar 20 are respectively bound to the shear reinforcement 31 (step S30). And install the formwork (not shown) in the junction (30) (step S40).

Thereafter, the concrete 33 is poured into the joint portion 30 surrounded by the formwork and cured (step S50), and when the curing is completed, the formwork is removed (step S60).

Second Embodiment

Figure 7 is a flow chart for a second embodiment of the interlayer intermediate joint method of the precast concrete pillar using the head reinforcement according to the present invention, Figure 8 is a conceptual diagram showing the reinforcement state of the upper column, Figure 9 10 is a cross-sectional view taken along line C-C ', and FIG. 10 is a conceptual view illustrating a reinforcement state of the lower pillar, and FIG. 11 is a cross-sectional view taken along line D-D' of FIG. 12 is a conceptual diagram illustrating a state in which an upper pillar and a lower pillar are connected according to the second embodiment.

As shown, in the present embodiment, the main roots 11 and 21 are exposed to correspond to the length of the junction 30 of the interlayer intermediate part, and the main root 11 of the upper pillar 10 is formed of the lower pillar 20. The upper pillar 10 and the lower pillar 20 are bent so as not to overlap with the main root 21. At this time, the main bar 11 of the upper column 10 and the lower column 20 is all made of a head reinforcement (13).

In addition, the upper column 10 or the lower column 20 after the upper pillar 10 and the lower column 20 are manufactured without bending the main root 11 to produce the upper pillar 10 and the lower pillar 20. It is also possible to bend the main roots 11 and 21 of () (step S110).

And aligning the upper pillar 10 and the lower pillar 20 to the joint portion 30 and approaching the exposed surface of the pillar facing the ends of the exposed main roots 11 and 21 (step S120). The reinforcing bar 31 is bound around the main bars 11 and 21 disposed outside the main bars 11 and 21 exposed from the upper columns 10 and the lower columns 20, respectively. In the present embodiment, since the main root 11 of the upper pillar 10 is bent, the outer root 21 of the lower pillar 20 is disposed outside. Therefore, the shear reinforcement 31 is installed around the main root 21 of the lower column 20 (step S130).

The subsequent steps (steps S140 to S160) are the same as the corresponding steps (steps S40 to S60) in the first embodiment, and thus description thereof is omitted.

The rights of the present invention are not limited to the embodiments described above, but are defined by the claims, and those skilled in the art can make various modifications and adaptations within the scope of the claims. It is self-evident.

10: upper pillar 20: lower pillar
13, 23: head rebar 30: joint portion

Claims (6)

In the method of joining the precast concrete column in the middle of the interlayer,
Exposing a portion of the main roots and cutting the remaining main roots corresponding to the lengths of the junction portions of the interlayer middle parts, and placing the main roots exposed from the upper and lower columns joined at the middle part of the interlayer part in a non-overlapping position;
Aligning the upper column and the lower column to the junction and bringing the exposed end of the pillar into close contact with an end of the column facing the exposed end;
Binding the outer periphery of the main root exposed at the upper and lower pillars with shear reinforcing bars;
Installing formwork at the joint;
Casting and curing concrete at the joint portion surrounded by the formwork; And
And removing the formwork when curing is completed.
Intermediate joint method of the precast concrete pillar using the head reinforcement, characterized in that the head is mounted on the end of the exposed main bar. The method of claim 1,
The number of the exposed main bars, half-layer joint method of the precast concrete pillar using the head reinforcement, characterized in that 1/2 of the number of the main bars arranged on the upper column or the lower column. The method according to claim 1 or 2,
Eight main roots are respectively disposed at each corner of the rectangular section and the middle of each corner of the upper column and the lower column, and either one of the upper column and the lower column is exposed to the main roots disposed at each corner of the rectangular section. , Interlayer intermediate joint method of the precast concrete column using the head reinforcement, characterized in that the other is exposed to the main bar disposed in the middle of each corner. In the method of joining the precast concrete column in the middle of the interlayer,
Exposing the main root corresponding to the length of the junction between the middle part of the interlayer, wherein one of the upper and lower pillars is bent so as not to overlap with the other main root;
Aligning the upper column and the lower column to the junction and bringing the exposed end of the pillar into close contact with an end of the column facing the exposed end;
Binding shear reinforcement muscles around the main roots disposed on the outer side of the main roots exposed from the upper and lower columns, respectively;
Installing formwork at the joint;
Casting and curing concrete at the joint portion surrounded by the formwork; And
And removing the formwork when curing is completed.
Intermediate joint method of the precast concrete pillar using the head reinforcement, characterized in that the head is mounted on the end of the exposed main bar. The method according to claim 1 or 4,
Intermediate joint method of the precast concrete pillar using the head reinforcement, characterized in that the length of the exposed main bar is 40 to 50 times the thickness of the main bar. The method according to claim 1 or 4,
Interlayer middle joint method of the precast concrete pillar using the head reinforcement, characterized in that 1/2 point in the length of the main bar exposed from the upper column or the lower column corresponds to 1/2 point of the interlayer height.

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