JP2910551B2 - Lap joint method of main reinforcement of SRC column - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lap joint method for a main reinforcement of an SRC (steel reinforced concrete) column.

[0002]

2. Description of the Related Art In general, there is a method by gas pressure welding or welding as a joint construction method of a main reinforcement of an SRC column. However, in the case of a high-rise or super-high-rise SRC building, the diameter of a reinforcing steel bar used becomes large and the joint work is difficult. In addition, there is a disadvantage that welding cannot be performed due to a little rain. In addition, the skill of skill is required for the pressure welding or welding of each reinforcing bar, and the working time becomes longer. Furthermore, it is also difficult to connect all the reinforcing bars simultaneously as a reinforcing bar cage.

Therefore, a lap joint method has conventionally been adopted. However, since a single reinforcing bar is used as a lap joint, work efficiency is poor in high-rise or super-high-rise steel-framed reinforced concrete buildings, and reinforcing bars are laid. Quality assurance of position accuracy, overlap length, lateral reinforcement of lap joints, etc.
It was not satisfactory in terms of construction management. Also,
After assembling the steel frame on site, the rebar is laid out, which causes a longer construction period.

[0004] On the other hand, as a technique for attaching a spiral hoop rebar to a steel column in advance, Japanese Patent Publication No. 51-479 has been proposed.
No. 74 discloses a bar arrangement method. In this method, a folded spiral hoop is fitted around the outer periphery of the steel column,
Next, a part of the beam or a beam connection bracket is fixed to a predetermined position of the steel column, and then the steel column is built at a construction site, and then a vertical bar is inserted into the spiral hoop bar,
Further, the spiral hoop rebar extended at a predetermined interval is connected to the vertical rebar.

[0005]

However, in the above-mentioned reinforcing method for the steel-framed reinforced concrete structural column, the steel column is a single material, only the spiral hoop bar is previously attached, and the main bar is integrally incorporated. is not. Therefore, it is desired to provide a lap joint method capable of further improving the degree of prefabrication, saving labor on site and shortening the construction period.

Accordingly, an object of the present invention is to provide a lap joint construction method of a main reinforcement of an SRC column which can solve the above-mentioned problems, can further improve the degree of prefabrication, and can more easily constitute a lap joint restraint structure. It is in.

[0007]

In order to achieve the above object, the lap joint construction method of the main reinforcement of the SRC column according to the present invention is to join a connecting metal to the outer periphery of a steel column in correspondence with the position of the lap joint of the main reinforcement of the column. Then, a restrained steel plate is joined to the outside of the connecting hardware by surrounding the steel column.

In addition, a steel plate is attached to the outer periphery of the steel column via a metal fitting so as to surround the outer periphery of the steel column in accordance with the position of the lap joint of the column main bar, and the column main bar is attached to the inside of the steel plate. A steel rebar unit is formed, and a lap joint of the column main rebar is formed in the region of the restrained iron plate at the same time as the method of building the steel rebar unit.

[0009]

According to the operation of the present invention, the steel plate surrounding the steel column is previously joined via a connecting metal in accordance with the position of the lap joint of the main column, so that the steel column is When building, already installed,
A lap joint can be formed by attaching a column main reinforcing bar to a constrained steel plate covering a lap joint position, and a constraint structure of a lap joint can be more easily obtained while improving the degree of prefabrication.

In addition, a steel plate is attached to the outer periphery of the steel column via a connecting hardware in accordance with the position of the lap joint of the column main reinforcement, and a steel rebar unit having the column main reinforcement attached inside the steel plate is formed. Since the lap joint of the column main reinforcement is formed at the same time as the method of building the reinforcement unit, almost all work other than the joint work of the steel columns can be eliminated at the site. Therefore, labor saving and improvement in work efficiency can be secured, and shortening of the construction period can be achieved, as compared with the case where the rebar assembling work is performed after the steel columns are erected on the site as in the related art.

[0011]

An embodiment of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, reference numeral 1 denotes a steel rebar unit manufactured in advance at a factory or the like, and includes a steel column 2, a column main bar 3,
Consisting of a constrained steel plate 4 and a hoop bar 5, it is built on site to form an SRC column.

The steel column 2 has a sectional shape having an open section 6 (see FIG. 2) open at least on one side when viewed from a flat section. In the case of the embodiment shown in FIG.
The steel column 2 includes four web portions 7 extending in a cross shape from the center and a flange portion 8 extending in a T-shape at the top.

In a factory or the like, first, a constrained steel plate 4 is attached to the outer periphery of the steel column 2 so as to form a rectangle along the steel frame cross section corresponding to the position of the lap joint of the column main bar 3. At this time, the connecting metal 9 is joined to the flange portion 8 of the steel column 2 by welding or the like, and the constrained steel plate 4 is joined to the steel column 2 via the connecting metal 9. Thus, the constrained steel plate 4 is integrated with the steel column 2 to form a strong structure. Further, by the joining of the constraining steel plates 4, the open section 6 is closed by the constraining steel sheet 4, and the whole has a cross-sectional shape having four closed sections 6 as shown in FIG.

Before or after the attachment of the constraining steel plate 4, an appropriate number of columns (one each in FIGS. 1 and 2) are provided in each section 6 of the steel column 2 as shown in FIGS. The main bar 3 is arranged, and one end side thereof is welded to the restraining steel plate 4, respectively.
It is integrated with the constrained steel plate 4.

In the state shown in FIG. 1, the column main reinforcement 3 is connected to the constrained steel plate 4 with the lower end of the column main reinforcement 3 protruding downward from the constrained steel plate 4.
However, the lower end of the column main bar 3 may be stopped within the vertical length of the constraining steel plate 4. In any case, in each section 6 closed by the constraining steel plate 4, another pillar main bar 3 joined in advance and another steel frame rebar unit 1 on site are inserted by joining. Pillar bar 3
A lap joint is formed between the lap joint.

Further, a hoop bar 5 is wound around the outside of the main bar bar 3 which is not covered with the restraining steel plate 4.

The steel rebar unit 1 constructed as described above
Is transported to the site, the steel columns 2 are connected to each other, and the closed section 6 of the constrained steel plate 4 is placed in FIG.
And as shown in FIG. 2, the column main reinforcements 3 and 3A from the up-down direction are arrange | positioned, and a lap joint is formed. In FIG. 1, A indicates the lap length of the lap joint, and B indicates the constraint range for the lap joint. Here, as the restraint range B for the lap joint, a case is shown in which the central section of the lap length A is covered, but it may be set to a length that completely covers the lap length A.

Next, a formwork is placed around the perimeter, concrete 10 is cast inside, and an SRC column 11 is constructed. In addition, prepare a precast concrete cylinder,
It is also possible to fill the cylinder with concrete or the like.

In the steel rebar unit 1 of the above embodiment, the steel column 2, the column main bar 3, the hoop bar 5, and the restrained steel plate 4 are integrally manufactured in a factory or the like. Can eliminate most of the work,
Also, it is not necessary to sharpen the column reinforcing bar 3. That is, since the constrained steel plate 4 and the column main bar 3 are integrated in advance, the amount of handling of the steel frame and the reinforcing bar in the construction work of the SRC column 11 can be reduced, and in particular, the individual lifting of the reinforcing bar which has been conventionally performed. Can be omitted, complicated work can be eliminated, and work safety can be improved. in short,
The degree of prefabrication is improved, and labor saving and shortening the construction period on site can be achieved.

Further, it is possible to easily construct the structure of the closed type restraining member by the steel plate 4 by partially utilizing the steel column 2 having an open steel cross section. Lap joint and concrete can be effectively restrained.

FIG. 3 shows a steel column 2 having one web portion 27 extending in the center and a flange portion 28 extending in a T-shape at the top thereof to form an H-shaped cross section as a whole. It is an example of an SRC column using the steel column 20. This steel column 2
0 also has an open section 6 that is open on at least one side when viewed in a plane section.
Is closed by a constraining steel plate 4 integrally attached around a steel column 2 via a connecting hardware 9. In this case, in each closed section 6, three sets of pillar main bars 3, 3A are provided.
Is formed. In the case of this example, too,
And the column main reinforcing bar 3 are integrated in advance and are manufactured in advance as the steel frame reinforcing bar unit 1.

FIG. 4 shows the steel column 2 having three web portions 37 extending in a T-shape as a whole from the center and a flange portion 38 extending in a T-shape at the top thereof. This is an example in which a steel column 30 having a T-shaped cross section is used. Also in the steel column 30 of this example, the constrained steel plate 4 is joined to the periphery thereof via the connecting hardware 9, and the open section 6 in which one side of the steel column 30 is opened is closed by the constrained steel plate 4.
Then, after the column main reinforcement 3 is welded in advance in each closed section 6 to form the steel frame rebar unit 1, a lap joint of the column main reinforcements 3 and 3A is formed on site.

FIG. 5 shows an example of an SRC column using a steel column 40 having L-shaped side plates 48 at four corners of a rectangular shape as the steel column 2, and the web extending to the center described above. It differs from the embodiment of FIGS. 2 to 4 in that the parts 7, 27 and 37 are not provided. Also in the steel column 40 of this example, the constraining steel plate 4 is attached around the steel frame via the connecting hardware 9, and the inside of the section 6 closed by the constraining steel plate 4 and the connecting hardware 9 has one corner. One column main reinforcing bar 3 is welded to the center of each of the book and the side portions to form the steel rebar unit 1.

In the preferred embodiment described above, the example in which the column main reinforcement 3 is previously joined to the constrained steel plate 4 at a factory or the like has been described. However, the column main reinforcement 3 may be attached to the constrained steel plate 4 on site. good. In this case, it is not possible to promote the prefabrication and reduce the amount of handling of the rebar. However, when the steel column 2 is erected on the site, the column is attached to the already installed restraining steel plate 4 covering the lap joint position. Main bar 3
By mounting the lap joint, the lap joint can be easily formed, the degree of prefabrication can be improved to some extent, and the lap joint restraining structure can be more easily obtained.

[0025]

In summary, according to the present invention, the constrained steel plate surrounding the steel column is previously joined via the connecting hardware so as to correspond to the position of the lap joint of the main bar.
When the steel column is to be built at the site, the lap joint can be configured by attaching the column main bar to the restrained steel plate covering the lap joint position, which is already attached,
The restraining structure of the lap joint can be more easily obtained while improving the degree of prefabrication.

In addition, a steel plate is attached to the outer periphery of the steel column via a metal fitting to correspond to the position of the lap joint of the column main reinforcement, and a steel rebar unit having the column main reinforcement attached inside the steel plate is formed. Since the lap joint of the column main reinforcement is formed at the same time as the method of building the reinforcement unit, almost all work other than the joint work of the steel columns can be eliminated at the site. Therefore, labor saving and improvement in work efficiency can be secured, and shortening of the construction period can be achieved, as compared with the case where the rebar assembling work is performed after the steel columns are erected on the site as in the related art.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a steel rebar unit according to one embodiment of a lap joint method of a main reinforcement of an SRC column according to the present invention.

FIG. 2 is a sectional view of an SRC column using the steel rebar unit of FIG.

FIG. 3 is a sectional view of an SRC column according to another embodiment of the present invention.

FIG. 4 is a sectional view of an SRC column according to another embodiment of the present invention.

FIG. 5 is a sectional view of an SRC column according to still another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 steel rebar unit 2, 20, 30, 40 steel column 3 column main bar 3A other column main bar 4 restrained steel plate 5 hoop bar 6 open section 7, 27, 37 web part 8, 28, 38, 48 flange part 9 connecting hardware 10 Concrete 11 SRC pillar

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E04B 1/16 E04C 5/16

Claims (2)

(57) [Claims] 1. A connection metal fitting is joined to the outer periphery of a steel column corresponding to a position of a lap joint of a column main reinforcement, and a restrained steel plate is joined by surrounding the steel column outside the connection metal fitting. Lap joint method for the main reinforcement of SRC columns. 2. A steel plate is attached to the outer periphery of a steel column via a metal fitting so as to surround the outer periphery of the steel column in accordance with the position of the lap joint of the column main reinforcement, and the column main reinforcement is attached to the inside of the steel plate. A lap joint method for a main reinforcement of an SRC column, comprising forming a steel rebar unit, and forming a lap joint of the column main reinforcement in the region of the restrained iron plate simultaneously with the method of building the steel rebar unit.