JPH0718785A - Hollow concrete column and manufacturing method thereof - Google Patents

Abstract

(57) [Summary] [Purpose] The structural performance of the pillar is secured over the entire length of the pillar in the axial direction, the weight of the pillar is reduced, and the on-site work such as rebar assembly work and formwork work is omitted. Provide a hollow concrete column whose workability is improved. [Structure] A column reinforcement 2 is connected to a column reinforcement joining hardware 1 embedded in a column base so as to extend from the column head, and a shear reinforcement 3 surrounding the column reinforcement 2 is arranged at predetermined intervals. A hollow portion H extending in the axial direction of the pillar was formed in the pillar body by centrifugal molding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow concrete column for constructing a reinforced concrete structure and a method for manufacturing the column.

[0002]

2. Description of the Related Art A pillar for constructing a reinforced concrete structure is a construction site where the same structure is constructed. At the construction site, pillar reinforcement and shear reinforcement are arranged according to its shape and structure content, and a formwork is assembled.
There is a method in which concrete is cast, or in which a column reinforcement and a shear reinforcement are arranged in advance depending on the shape and structure of the column at a factory and then assembled at a construction site.

Further, in Japanese Patent Application Laid-Open No. 5-52001 (Japanese Patent Application No. 3-209401), among the main bars of a rebar cage assembled from a column main bar extending in the column axis direction and a hoop bar surrounding the column main bar. A wire mesh is stretched along the peripheral side, and a portion of the concrete corresponding to one side surface of the box-shaped cross section is placed between the lower mold and the outer mold, which are respectively assembled at the lower surface and both side surface positions of the rebar cage, Before hardening the concrete, install a rebar basket with a wire mesh on the concrete, then fill the concrete between the concrete outer mold and the wire mesh, and after hardening the concrete, remove the outer mold hollow A method of manufacturing concrete columns has been proposed.

Further, in the manufacture of the hollow column, the column reinforcement and the reinforcement reinforcement surrounding the column reinforcement are arranged, the reinforcement is included, and a mesh form is formed inward from the inner periphery of the column reinforcement. A method of manufacturing a thin concrete plate in a flat plate shape so that a hollow column is formed by integrally integrating a skeleton concrete on the outer peripheral side, or the outer peripheral surface forming a cross section of the column is formed by a thin concrete plate as a formwork. Is proposed.

[0005]

However, the above-mentioned construction of columns by construction requires a lot of steps and labor for the reinforcement work and the formwork assembly, and the construction period cannot be shortened. In addition, the length of the hollow concrete column is the length excluding the girder of the beam that will be erected between the columns later, and the hollow column is erected, the beam is erected, and the formwork is applied to the column part excluding the girder. Must be assembled, which complicates the work.

[0006] Furthermore, a method of manufacturing hollow concrete by using the outer peripheral surface forming a cross section of a column by a thin concrete plate as a formwork is a method of setting a formwork and arranging the column reinforcement and the column reinforcement with shear reinforcement. The step of inserting the reinforced steel cage into the hollow column occurs, and these operations are complicated. The present invention has been proposed in view of the problems of the prior art, and the object thereof is to ensure the structural performance of the column over the entire length in the longitudinal direction of the column and reduce the weight of the column. Manufacture of hollow concrete columns, where on-site work such as rebar assembly and formwork work is omitted, and workability is improved, and the above characteristics are maintained in a simple process and manufacturing costs are reduced. The point is to provide a method.

[0007]

In order to achieve the above-mentioned object, a hollow concrete column according to the present invention connects a column bar to a column-bar-joint metal fitting embedded in a column base and forms the column bar. Extending from the column height in the axial direction, and arranging shear reinforcements surrounding the column reinforcement at regular intervals along the column reinforcement, and forming a hollow portion extending in the column axial direction by centrifugal molding in the column structure. Is configured.

According to a second aspect of the present invention, at the end of the hollow concrete column, concrete having a small cross-section of a beam member which is horizontally installed on the column is cut. In the invention of claim 3, the skeleton of the hollow concrete column is configured to have a column length of a plurality of nodes. Further, according to the method for producing a hollow concrete column according to the present invention, the column reinforcement is connected to the column reinforcement joining hardware disposed in the column base so as to extend in the column axial direction, and the column reinforcement is surrounded and sheared. Reinforcing bar made by arranging reinforcing bars at regular intervals is mounted in an outer mold for hollow concrete column molding, and the end of the reinforcing bar cage opposite to the pillar-reinforcing metal fitting and the outer mold Inserting the molding material of the beam material horizontal opening between them, fixing the outer mold to the rotary mold for centrifugal molding, putting concrete into the outer mold, and drivingly rotating the rotary mold. After the input concrete is solidified, the molding material of the beam lateral opening is released from the mold as well as the rotary mold and the outer mold.

[0009]

In the hollow concrete column according to the present invention, the column reinforcement connected to the column-reinforcing metal fitting embedded in the column base is extended from the column height along the column axial direction to form the extension portion. The hollow concrete columns can be easily and surely joined through the column-reinforcing metal fittings embedded in the second-order hollow concrete columns. In addition, the column reinforcement and the reinforcement reinforcement that surrounds the column reinforcement are arranged at regular intervals along the column reinforcement, and the column structure itself is formed by a solid concrete structure extending in the column axial direction by centrifugal molding. Therefore, each of the rebar cages constitutes a hollow concrete column having sufficient structural strength against axial force, shearing force, and bending.

According to the second aspect of the present invention, the hollow concrete columns are cut with concrete having a small cross-section of the beam material which is laid horizontally between the columns, and the shearing is provided around the column bars in the cut portions. Since the reinforcing bars are exposed, a U-shaped beam is installed horizontally in the above-mentioned cutout section, and opposite U-shaped beams are installed oppositely through the cutout section, and the U-beams are sandwiched between them to face each other. Beam anchoring bars can be arranged through the heads of the hollow concrete columns across the beams framed so that the columns and beams are integrated.

In the invention of claim 3, since the skeleton of the hollow concrete column has a column length of a plurality of joints, hollow concrete for a plurality of floors is built in at once, and the building method is speeded up,
The work period can be shortened. According to the invention of claim 4, the column reinforcing bar is braided by connecting the column reinforcing bar to the column reinforcing bar joining hardware and arranging the shear reinforcing bar at regular intervals on the same column reinforcing bar,
The rebar cage is mounted on the outer mold for hollow concrete pillar molding,
Between the outer mold and the end opposite to the column-reinforcing metal fittings in the rebar cage, the molding material for the beam horizontal crossing opening is interposed, and the outer mold is fixed in the rotary mold. Then, concrete is poured into the outer mold and the rotating mold is driven and rotated, whereby the concrete poured into the outer mold is compacted by centrifugal force to form pillar concrete.

Thus, after the concrete in the outer mold is solidified, the rotary mold and the outer mold, as well as the molding material of the beam member horizontal opening, are removed from the mold, whereby the rebar cage is formed by the outer mold. A column concrete that is built in and has a hollow part formed by centrifugal force is molded, and at the same time, the molded part of the beam material opening for horizontal beam An opening having a small cross section is formed.

[0013]

The present invention will be described below with reference to the illustrated embodiments. In FIG. 1, A is a hollow concrete column for the first floor having a substantially square cross section, and a hollow portion H having a circular cross section formed by centrifugal molding is provided along the axial direction of the column. ing.

In the column base of the column A, the column-reinforcing metal fittings 1 are embedded in the corners and in the middle, respectively, and the column-reinforcing rods 2 whose lower ends are joined to the column-reinforcing metal fittings 1 are in the axial direction of the column. And is extended above the height of the pillar. In the figure, 2a is an extension portion of the columnar muscle from the stigma. Shear reinforcements 3 surrounding the respective column reinforcements 2 are arranged at predetermined intervals in the column axis direction on the respective column reinforcements 2, and the column heads of the columns A are installed between the columns A. An opening 4 is provided by cutting out a concrete having a small cross section of a beam material, and the column reinforcement 2 and a part of the shear reinforcing reinforcement 3 are exposed in the opening 4.

The cylindrical wall 5 in the hollow portion H having the circular cross section
Is configured so that a part of the columnar bar 2 and a part of the shear reinforcing bar 3 are exposed on the outer circumferential arc surface thereof. Therefore, the post-filling concrete for the hollow portion H is passed through the column reinforcement 2 and the shear reinforcement reinforcement 3 exposed in the hollow portion H, and the hollow portion H
It is integrally connected to the peripheral wall of the. 4 and 5
Shows the usage state of the hollow concrete column A, and as shown in FIG. 4, a U-shaped precast concrete hollow beam member B is horizontally installed in the opening 4 provided at the upper end of the hollow concrete column A. The upper beam reinforcement 6 and the lower beam reinforcement 7 are reinforced and fixed to the hollow concrete column A, and as shown in FIG. 5, the concrete D is placed on the floor member C composed of the hollow concrete column A and the beam member B as well as the half PC slab. The pillars,
The beam and floor are integrated. In the figure, 8 is a stirrup.

FIG. 6 shows another embodiment of the present invention, in which the pillar A is composed of pillars of two floors and the construction of the pillars is speeded up.
The work period can be shortened. In the figure, the same parts as those in the above-mentioned embodiment are designated by the same reference numerals. 7 and 8 show a method for manufacturing a hollow concrete column according to the present invention, in which the lower end portion of the column bar 2 is connected to the column-bar-joined metal fitting 1 arranged at the corner and the middle of the column base. The respective column reinforcing bars 2 are extended in the column axial direction, and the shear reinforcing bars 3 surrounding the respective column reinforcing bars 2 are arranged at predetermined intervals in the column axial direction, and the reinforcing bar cage P thus configured is hollow concrete. A frame M'for concrete depletion with a small cross section of a beam material that is mounted inside a column forming outer mold M and further mounted on a column.
Is mounted on the outer mold M for molding, or a filler such as a urethane foam material for molding the cutout portion is loaded, and the outer mold M is mounted in the tubular body N for centrifugal molding, Concrete is flown in through the concrete inflow port K of the outer mold M, the cylinder N is driven and rotated by a driving device (not shown), and the inflowing concrete is pressed against the inner peripheral wall of the outer mold M by centrifugal force thereof. The cylindrical wall 5 and the hollow portion H are molded along the column axis direction, excess water is discharged, and the filled concrete is cured,
After exhibiting the required strength to 1, the hollow concrete column is manufactured by demolding the cylinder N and the outer mold M as well as the concrete cutting frame M'having a small cross section of the beam material.

The outer mold M is fixed to a four-sided mold plate 9, an end form plate 10 for fixing the post-column connecting member 1 for the column base, and an extension 2a of the column bar projecting from the column head. Edge formwork plate 1
1 and 1.

[0018]

As described above, the hollow concrete column according to the present invention connects the column bar to the column-reinforcing metal fitting embedded in the column base and extends the column bar from the column height in the column axis direction. Since the reinforcement reinforcements that surround the column reinforcement are arranged at regular intervals along the column reinforcement, the column reinforcement joint hardware and the extension of the column reinforcement from the column height allow the column to be constructed on each floor. On the other hand, the column bars on the upper and lower floors are simply and surely connected. Further, the concrete to be placed later and the column-reinforcing rebar are integrated by the shear-reinforcing rods surrounding the respective column rebars and arranged at regular intervals, so that the structural performance of the reinforced concrete columns is secured. Furthermore, by forming a hollow part that extends in the axial direction of the pillar by centrifugal molding, a solid concrete pillar structure is constructed, weight reduction is achieved, and assembling of the reinforcing bars and formwork work are omitted. The work is simplified, the labor of specialized workers is reduced, and the workability is improved.

According to a second aspect of the present invention, the hollow concrete columns are provided with openings at the ends thereof, in which the concrete having a small cross section of the beam material horizontally spanned between the columns is cut off. A U-shaped concrete hollow beam member across the end of the hollow concrete through a section to fix beam reinforcements on the beam member and the column, and concrete is cast across the hollow beam member and the column. It can be installed to integrate columns and beams.

According to a third aspect of the present invention, the hollow column is formed of a column body so as to have a column length of a plurality of nodes.
Furthermore, workability is improved and labor is saved. According to the invention of claim 4, the column reinforcement is connected to the column-reinforcing metal fitting arranged in the column base so as to extend in the column axis direction from the column end, and the column reinforcement is surrounded at regular intervals. Arranging the shear reinforcing bar, and mounting the rebar cage thus constructed on the outer form for hollow concrete column molding, and between the outer form and the rebar cage metal fittings on the opposite side of the outer form. By interposing the molding material of the opening for crossing the beam material between them, fixing the outer mold to the rotary mold for centrifugal molding and putting in concrete, by rotating the rotary mold by driving, the centrifugal force Hollow concrete columns are molded by.

Further, by demolding each of the above molds,
It is possible to easily form a beam-shaped small cross section erected on a pillar head, and to easily and inexpensively manufacture a hollow concrete pillar excellent in workability and structural performance.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a hollow concrete column according to the present invention.

FIG. 2 is a perspective view of FIG.

3 (a), (b), and (c) are views in the direction of arrow in FIG. 1, respectively.
It is a figure, an arrow roro figure, and an arrow hah figure.

FIG. 4 is a perspective view showing a state in which a concrete beam is installed on the hollow concrete column.

5 is an enlarged cross-sectional view of FIG.

FIG. 6 is a front view showing another embodiment of the hollow concrete column according to the present invention.

FIG. 7 is a cross-sectional view in the column axis direction showing a state in which a reinforcing bar cage is attached to the hollow concrete column molding outer frame according to the present invention.

FIG. 8 is a plan sectional view showing a state where the outer mold is mounted on a centrifugal molding cylinder.

[Explanation of symbols]

 A Hollow concrete column B U-shaped precast concrete hollow beam member C Floor member D Concrete K Concrete inlet M Outer form for hollow concrete column M P Reinforcing bar cage 1 Column reinforcement joining hardware 2 Column reinforcement 2a Extension of column reinforcement 3 Shear reinforcement reinforcement 4 Opening 5 Cylinder wall 6 Upper beam reinforcement 7 Lower beam reinforcement 8 Stirrup 9 Form plate 10 End form plate 11 Edge formwork plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Tsukamoto 1-8-3 Shimbashi, Minato-ku, Tokyo Inside Nippon Concrete Industry Co., Ltd.

Claims (4)

[Claims] 1. A column reinforcing bar is connected to a column-reinforcing metal fitting embedded in a column base, and the column reinforcing bar extends in the column axial direction from the column height, and the column is fixed at regular intervals along the column reinforcing bar. A hollow concrete column characterized in that a shear reinforcing bar surrounding the line is arranged, and a hollow portion extending in the column axial direction by centrifugal molding is formed in the column body. 2. The hollow concrete column according to claim 1, wherein an opening is provided at an end of the hollow concrete column, in which concrete having a small cross-section of a beam material which is horizontally stretched between the columns is cut. 3. The hollow concrete column according to claim 1, wherein the frame of the hollow concrete column has a column length of a plurality of nodes. 4. A column reinforcing bar is connected to a column reinforcing member connected to the column base so as to extend in the axial direction of the column, and the column reinforcing bar is surrounded by shear reinforcing bars arranged at regular intervals. The reinforcing bar cage is mounted in the hollow concrete column forming outer formwork, and the beam material horizontal crossing opening is provided between the outer side frame and the end opposite to the column-reinforcing metal fitting in the reinforcing bar cage. Inserting a molding material, fixing the outer mold to the rotary mold for centrifugal molding, charging concrete into the outer mold, driving and rotating the rotary mold to solidify the concrete, and then rotating the concrete. A method for producing a hollow concrete column, characterized in that a molding material for a beam horizontal opening is demolded in the same manner as a mold and an outer mold.