JP2661452B2 - Construction method of reinforced concrete columns and beams - 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 for constructing precast concrete columns and beams.

[0002]

2. Description of the Related Art Conventionally, a half-made precast concrete column material having a surface layer portion and a hollow portion used for the construction of a concrete column includes a cover concrete type shown in FIG. 9, a hoop stud type shown in FIG.
And the hoop muscle and main muscle driving type shown in FIG. In the cover concrete type, neither the hoop bar 1 nor the main bar 2 is located in the hollow part 4 but in the concrete of the surface part 3. For this reason, in the cover concrete type, since the cross-sectional area of the unreinforced portion where no reinforcing bars are provided increases, the column diameter becomes larger than usual. In the hoop driving type, the main bar is driven into the inner hollow portion 4 and the cross-sectional performance is reduced, so that the column diameter is also larger than usual. In the hoop streak and main stud driving type, the main streak is connected inside the hollow portion 4 so that the main streak is driven inward, and the cross-sectional performance is reduced. In addition, since the lateral pressure of concrete is applied when concrete is poured, the thickness of the plate must be increased to increase the strength of the concrete.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems. The purpose is to make the entire cross section of the precast column material function effectively, and to provide greater strength than the column diameter, and to reduce the labor for assembling reinforcing bars and formwork when constructing concrete columns, and to reduce the size of the lifting machine. It is an object of the present invention to propose a method for constructing precast concrete columns and beams which can be manufactured efficiently by a centrifugal molding method and can ensure high quality and high strength.

[0004]

The precast concrete column material according to claim 1 is a precast concrete column material having a surface layer and a hollow portion, wherein the hollow portion has a circular cross section, and a hoop streak and a surface layer are formed in the surface layer. The main reinforcement is arranged at the corners of the column, the main reinforcement protrudes from the upper surface of the column capital, and the surface layer concrete of the column base is cut out to provide a space for the lap joint of the main reinforcement.

The precast concrete column material according to claim (2) is a precast concrete column material having a surface portion and a hollow portion, wherein the hollow portion has a circular cross section, a hoop streak in the surface portion and a main bar in a corner portion of the surface portion. The main joint protrudes from the upper surface of the column cap, and a sleeve joint fixed to the lower end of the main bar is opened on the lower surface of the column base, and precast in the beam joint space cut out on each intermediate side of the surface layer concrete. Place the ends of the beam material, arrange reinforcing bars by hanging and inserting a reinforcing bar basket consisting of main bars and hoop bars into the hollow portion,
In addition, concrete is poured into the hollow portion to be integrated.

The precast concrete column material used has a hoop reinforcing bar in the surface layer concrete and a main reinforcing bar in the concrete at the corner portion of the surface layer, so that all cross sections can function effectively. It is possible to construct a concrete column having a superior cross-sectional performance as compared to a concrete cover type or a hoop driving type. In addition, the work of assembling the reinforcing bar and formwork of the columns can be omitted, the main reinforcing bar between the upper and lower columns can be connected by a lap joint or a sleeve joint, and the construction can be performed only by casting concrete. In addition, this column material having a hollow section with a circular cross section, by centrifugal molding method,
High quality products can be manufactured with high productivity. Light weight (for example, 1,000mm □, 850mmφ, 1 = 3,000
(W = 3.0 ton in mm), and the hoist can be downsized. In the hollow part, beam reinforcement is arranged to fix the beam,
Reinforcement can be achieved by arranging assembled steel bars and steel frames. It is also an advantageous shape against the lateral pressure of concrete during concrete casting. Further, this construction method can efficiently construct a high-strength concrete column reinforced with a reinforcing bar of a reinforcing bar cage.

[0007]

1 and 2 show a precast concrete column 5-1 used in the invention of item (1). This pillar 5-1
Has a square cross section, is composed of a surface layer portion 3 and a hollow portion 4 having a circular cross section. The hoop streaks 1 which are spirally continuous along the outer edge and the three main bars 2 arranged at each corner are all within the surface layer portion 3. The main bar 2 is arranged to protrude upward from the upper surface of the stigma.

A beam joint space 6 shown in FIG. 2 (a) is provided at the center in the width direction of each side surface of the capital portion 3 and is notched in a rectangular shape. The inner surface of each corner of the column base surface layer portion 3 is notched in a substantially pentagonal cross-section, and a joint space 7 for the main reinforcement shown in FIG. 2 (c) is provided. Overhangs.

Next, an embodiment of a concrete column, beam and floor construction method using the column member 5-1 will be described.

FIG. 3 (a) shows a concrete floor slab 8 on which a concrete pillar is to be constructed, and a main bar 2 'projects from the lower floor. (b) In the figure, the column base of the column member 5-1 is aligned and set at the position of the main bar 2 '. The main muscle 2 'is shown in FIG.
As shown in (b), the lap joint is formed by arranging along the main reinforcement 2 in the joint space 7 of the column member 5-1.

Next, in FIG. 3 (c), the end of the precast beam member 9 also serving as a mold is placed and set in the beam joining space 6 of the column member 5-1. After arranging the main reinforcing bar 10 across the hollow portion 4 of the column member 5-1, in (e),
A precast slab material 11 also serving as a formwork is set, and an upper end bar 12 is arranged on the slab material.
(1) Concrete 13 is cast on the hollow portion 4, the beam member 9, and the slab material 11, and concrete columns, beams and floor slabs are constructed.

In the construction of this concrete column, if the proof strength is insufficient only with the hoop bar 1 and the main bar 2 arranged on the column member 5-1, as shown in FIGS. A reinforcing bar 14 or a steel frame 15 composed of the main bar 2 'and the hoop bar 1' is put in the inside.

Reinforcing reinforcing bars 14 are joined by a joint type such as a lap joint or a gas pressure welding and arranged.

In the case of a lap joint, after the step of FIG.
As shown in FIG. 6 (a), it is suspended in the hollow part 4 from above. Reinforcing bars between the upper and lower reinforcing bars 14 can be arranged in the manner of pile bars (lap joints) of cast-in-place concrete piles. In the case of the joint type by gas pressure welding or the like, as shown in FIG. 6A, after the step of FIG. After bundling the upper parts of the fourteen, a precast concrete column is set as shown in FIG. In the case of the steel frame 15, FIG.
As shown in (c), before setting the pillar 5-1, the steel frames 15 of two or three sections are erected, and the pillar 5-1 is suspended and set from above from outside. In order to join the steel beams 16 as shown in FIG. 6 (d), they are fixed by, for example, a paddle method.

FIGS. 7 and 8 show an embodiment of the precast concrete column according to the invention of item (2). This pillar 5-2
Is different from the column member 5-1 shown in FIGS. 1 and 2 in that there is no joint space 7 in the column base, and instead, a sleeve joint 17 is fixed to the lower end of the main bar 2, and the open end of the sleeve joint 17 is opened. Is opened in the surface of the column base.

A concrete column using the column member 5-2,
In order to construct the beam and the floor, it can be constructed in substantially the same manner as the embodiment of the construction shown in FIG.

That is, when the column 5-2 according to FIG. 3 (b) is set at the position of the main bar 2 'protruding from the floor slab 8, the main bar 2' is inserted through the sleeve joint 17 and arranged. Thereafter, similarly to FIG. 3, the beam member 9, the beam main reinforcement 10, the slab material 1
1. After arranging the upper reinforcing bar 12 of the slab and placing concrete 13, grout is filled in the sleeve joint 17 and the main reinforcing bars are joined.

In order to manufacture this precast concrete column material, a core having a square section is mounted in a cylindrical mold for centrifugal molding, a hoop bar and a main bar are disposed therein, and concrete is poured into the shaft. Can be manufactured by a centrifugal molding method that rotates about the center. The beam joint space of the column capital or the lap joint space of the main reinforcement can be formed using a mold or styrene foam.

In the above embodiment, a spiral hoop streak is used, but an annular or discontinuous hoop streak may be used.

[0020]

The present invention has the following effects.

The concrete to be cast later is integrated into the surface layer portion and the hollow portion so that the entire cross section of the column can be effectively used, and a large proof stress can be given as compared with the column diameter.

It is advantageous against lateral pressure of concrete at the time of placing concrete at the column base of the surface layer,
There is no fear of collapse.

[0023] All cross sections can function effectively.

Since the reinforcing bars in the hollow portion are arranged later by inserting the reinforcing bars into the reinforcing bar cage, the design can be changed.

Since the column base of the surface layer of the precast concrete member is circular, it has an advantageous shape against the lateral pressure of concrete at the time of placing concrete, and a longer column can be constructed.

The beam joint space is provided by notching the column capital, and the ends of the precast beam members are placed and joined in this beam joint space, so that the workability of the beam and the slab is improved, which is more preferable.

[0027] In the column base, only the inner surface at the corner is cut out, so that the workability of the lap joint with the lower floor becomes easy without lowering the cross-sectional performance.

[Brief description of the drawings]

FIG. 1 is a front view showing a partial section (DD) of a precast concrete column material according to the example of the item (1).

2 (a), 2 (b) and 2 (c) are AA and B- 1 of FIG. 1, respectively.
It is a B, CC sectional view.

FIGS. 3 (a), (b), (c), (d), (e), (f) are explanatory diagrams showing concrete column working examples in the order of steps.

FIG. 4 (a) is a front view showing a partial cross section of a column member of an embodiment in which main reinforcing bars are joined by lap joints, and FIG. 4 (b) is a CC cross sectional view.

FIG. 5 (a) is a cross-sectional view of a column member in which a reinforcing bar is provided in a hollow portion, and FIG. 5 (b) is a column member in which a steel frame is provided in a hollow portion.

FIG. 6 (a) shows a state in which an assembling reinforcing bar is arranged in a hollow portion of a column member,
(b) is a state in which a steel frame is erected before the set of column members, (c)
FIG. 4 is an explanatory view showing a state in which a pillar is set outside a built-in steel frame, (d) shows a state in which a steel beam is joined to a reinforced steel frame, and (e) shows a state in which reinforcing steel is pre-assembled.

FIG. 7 is a front view showing a partial cross section (DD) of the precast concrete column material of the example of the item (2).

8 (a), (b) and (c) are columns AA and FIG. 7 of FIG. 7, respectively.
It is BB and CC sectional drawing.

FIG. 9 is a cross-sectional view of a conventional cast concrete type precast concrete column.

FIG. 10 is a cross-sectional view of a conventional hoop stud driving type precast concrete column material.

FIG. 11 is a cross-sectional view of a conventional precast concrete column member of a hoop and a main bar driving type.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Hoop muscle, 2 ... Main muscle, 3 ... Surface part, 4 ... Hollow part, 5
... precast concrete pillars, 6 ... beam joint space, 7
... space for joint of main bar, 8 ... floor slab, 9 ... precast beam member, 10 ... main bar of beam, 11 ... precast slab material, 12 ... upper end bar of slab, 13 ... concrete, 14
... reinforcing reinforcing bars, 15 ... steel frames, 16 ... steel beams, 17 ... sleeve joints.

 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Yukimasa Ogiwara Kashima Construction Co., Ltd. 1-2-7 Moto-Akasaka, Minato-ku, Tokyo (56) References JP-A-2-225737 (JP, A) JP Hei 2-232438 (JP, A) JP-49-44723 (JP, B2)

Claims (2)

(57) [Claims] 1. A precast concrete column having a surface portion and a hollow portion, wherein the surface portion has a rectangular cross section, the hollow portion has a circular cross section, a hoop is arranged in the surface portion, and a corner of the surface portion is provided. Reinforcing the main reinforcement at the corners, projecting the main reinforcement from the top of the capital, notching each intermediate side of the surface layer concrete of the capital with a square notch to provide a beam joint space, and the end of the precast beam material in the beam joint space In addition, a joint space for the main reinforcing bar is provided by notching only the inner surface of each corner of the surface layer concrete of the column base, and a reinforcing bar basket including a main reinforcing bar and a hoop reinforcing bar is suspended and inserted into the hollow portion. Precast concrete columns characterized by the following: 2. A precast concrete column material comprising a surface portion and a hollow portion, wherein the surface portion has a rectangular cross section.
The hollow section has a circular cross section, hoop reinforcement is arranged in the surface layer, and main reinforcement is arranged at the corners of the surface layer, and the main reinforcement projects from the top of the capital, and each intermediate side surface of the concrete at the surface of the capital The beam joint space is provided by notching a square, the end of the precast beam material is placed in the beam joint space, and a sleeve joint fixed to the lower end of the main bar is opened in the lower surface of the column base. And a column characterized in that the reinforcing bar composed of a main bar and a hoop bar is hung in the hollow portion afterwards and inserted into the hollow portion to arrange the reinforcing bars, and concrete is cast in the hollow portion to be integrated. Construction method of beam.