JPH0726624A - Joint method of steel encased reinforced concrete column in precast method - Google Patents

Abstract

PURPOSE:To provide a joint method by which the workability is increased and the construction period is reduced and further, the toughness of the columns is increased. CONSTITUTION:The head of a steel pipe column 1 in a precast SRC column A of the lower floor is projected to be higher than the column base of a precast SRC column B of the upper floor. A steel frame sleeve 5 to insert the steel pipe column 1 and a sleeve 6 to insert reinforcements are provided at the base of the SRC column B of the upper floor. The steel frame sleeve 5 for inserting the steel pipe column 1 of the SRC column B of the upper floor and the sleeve 6 for inserting column reinforcements are inserted into the head of the steel pipe column 1 of the SRC column A of the lower floor and the column reinforcements 2 and non-contractive mortar is poured into respective sleeves 5, 6.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a steel frame reinforced concrete structure column (hereinafter referred to as SRC column) in the precast method.
The present invention relates to the joining method.

[0002]

2. Description of the Related Art In the conventional SRC column joining method,
Welding was used to join the steel frames, and after the steel frames were welded, the reinforcement of the reinforced concrete part and the placing of concrete were performed.

[0003]

In the above-mentioned conventional method, the column steel frame of the SRC column must be welded on-site, and in order to secure the workability, the reinforcing bar arrangement is performed after the column steel frame is welded. The work is being done, and after the reinforcement is arranged, the formwork and concrete are placed. As a result, the number of work processes in the field is increasing.

The present invention has been proposed in view of the above-mentioned problems of the prior art, and the object thereof is to join steel-framed reinforced concrete structural columns in the precast method in which the workability is improved and the construction period is shortened. The point is to provide a construction method.

[0005]

[Means for Solving the Problems] In order to achieve the above-mentioned object, according to the joining method of the steel frame reinforced concrete structure column in the precast method according to the present invention, the column steel pipe head in the precast steel frame reinforced concrete structure column of the lower floor, While protruding to a position above the column base of the column of the precast steel-framed reinforced concrete structure of the upper floor, in the leg of the column of the upper floor, a column steel pipe insertion steel sleeve and a column reinforcing rod insertion sleeve in the column of the lower floor Provided, after the construction of the beams and slabs on the construction floor, insert the column steel pipe insertion steel sleeve and column reinforcement insertion sleeve of the column foot of the upper floor to the column steel pipe head and the column reinforcement of the lower floor, respectively, The steel frame sleeve and the column-bar insertion sleeve are respectively filled with mortar.

[0006]

As described above, according to the present invention, the column steel pipe head and the column rebar in the precast SRC column on the lower floor are inserted into the steel frame sleeve and the column rebar insertion sleeve in the precast SRC column on the upper floor, and the mortar is inserted into each sleeve. By filling the precast SRC of the upper and lower floors
The pillars are easily joined. The SR configured as described above
The bending moment and axial force are transmitted by the joint of the column base steel pipe of the C column.

Further, according to the present invention, since the column base has a large amount of steel frame, the rigidity and toughness of the column base are improved.

[0008]

The present invention will be described below with reference to the illustrated embodiments. A is a precast SRC column on the lower floor, and one column steel pipe head is projected to a position above the column base of the precast SRC column B on the upper floor. Reference numeral 2 is a column reinforcing bar, 3 is a column reinforcing bar, and 4 is a column steel pipe joint portion, in which ribs are arranged and roughening is performed.

The leg portion of the precast SRC column B on the upper floor is provided with a steel frame sleeve 5 for inserting a column steel pipe and a sleeve 6 for inserting a column reinforcing bar in the SRC column A on the lower floor. In the figure, 7 and 8 are the column reinforcements and column reinforcements in the SRC column B on the upper floor, and 9 is the horizontal stiffener. At the time of construction, the SRC pillar A on the bottom floor is erected (see FIG. 4A), and the PC beam C is joined to the same pillar A. (See Figure 4 (b))
In the figure, 10 is a beam steel frame, and 11 is a rib. If steel beams are used instead of ribs, stud bolts are used.

Next, the beam upper end reinforcements 12 and the slab reinforcements 13 are laid out (see FIG. 4C), the column-beam joints and the slab concrete 14 are placed, and (see FIG. 4D) upper floors SR
The steel frame sleeve 5 for inserting the column steel pipe and the sleeve 6 for inserting the column reinforcing rod of the C column B are inserted into the projecting portion of the column steel pipe 1 and the column reinforcing rod 2 of the SRC column A on the lower floor (Fig. 5 (e) (f)). After confirming the erection accuracy of the column, non-shrink mortar 15 is injected into the sleeves 5 and 6 of the column base through the mortar injection holes 5a and 6a (see FIG. 5 (g)). Next, a PC beam C on the upper floor is installed (see FIG. 5C), and the above steps are repeated.

The beam may be made of steel such as S, SRC, or SPC, and the presence or absence of a bracket at the beam-column joint does not matter.

[0012]

According to the present invention, as described above, the column steel pipe head in the precast SRC column on the lower floor is made to project upward from the column base of the precast SRC column on the upper floor, and the steel pipe head and column for the same column are provided. By inserting a steel frame sleeve for inserting a column steel pipe and a sleeve for inserting a column reinforcement into the column base of the precast SRC column on the upper floor, and filling the respective sleeves with mortar, the steel pipes of the upper and lower SRC columns are joined. Simultaneously joining the reinforcing bars improves workability, shortens the construction period, and improves the toughness of the column base.

Further, the bending moment and the axial force are surely transmitted by the joint of the column steel pipe leg portion, and the amount of rebar of the column base portion is large, so that the rigidity and toughness of the column base portion are improved.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a joint portion of precast SRC columns of upper and lower floors constructed by the method of the present invention.

FIG. 2 is a front view of an SRC pillar on the upper floor.

3 (a), (b), and (c) are views in the direction of arrows in FIG. 2, respectively.
It is an arrow view Haru figure as well as an a figure and an arrow view roro figure.

4 (a), (b), (c), and (d) are front views showing steps of the present invention.

5 (E), (F), (G), and (H) are front views showing a step that follows the step of FIG.

[Explanation of symbols]

 A Precast SRC columns on the lower floor B Precast SRC columns on the upper floor C PC beam 1 Column steel pipe 2 Column reinforcement 3 Column reinforcement 4 Column steel pipe joint 5 Column steel pipe insertion steel sleeve 5a Mortar inlet 6 Column reinforcement insertion sleeve 6a Mortar inlet 7 Column rebar 8 Column rebar 9 Horizontal stiffener 10 Beam steel frame 11 Rib bar 12 Upper beam bar 13 Slab muscle 14 Concrete of column-beam joint and slab 15 Non-shrink mortar

Claims (1)

[Claims] 1. A column steel pipe head in a precast steel-framed reinforced concrete structure column of a lower floor is projected to a position higher than a column base portion of a column of a precast steel-framed reinforced concrete structure of an upper floor, and at the leg portion of the column of the upper floor. , Providing a steel sleeve for inserting a column steel pipe and a sleeve for inserting a column bar in the column of the lower floor, and after constructing a beam and a slab on the construction floor, the column steel pipe head and the column rebar of the lower floor respectively the column of the upper floor Joining method of steel reinforced concrete structure column in precast method characterized by inserting steel sleeve for inserting column steel pipe of column and sleeve for inserting column reinforcement, and filling said steel sleeve and column reinforcement insertion sleeve with mortar respectively .