JP3181068B2 - Precast concrete column manufacturing method and formwork apparatus - 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 of manufacturing a precast concrete column having a connection for connecting a beam of a building, and a formwork apparatus.

[0002]

2. Description of the Related Art When a building is composed of concrete pillars, a formwork corresponding to a desired pillar shape is assembled around a steel frame or a reinforcing bar, and ready-mixed concrete is cast inside the formwork. Is common. However, recently, in order to save labor for assembling and dismantling formwork for constructing pillars, hollow concrete pipes produced in advance in factories have been used.
A so-called precast concrete column is used as a formwork. A steel bar or a steel frame is arranged inside the precast concrete column, and fresh concrete is poured into the precast concrete column. The construction of pillars has been undertaken. The precast concrete column as described above combines an outer frame according to the outer shape of the column and an inner frame according to the inner shape, and inputs fresh concrete into a gap formed between the outer and inner frames to vibrate. Is manufactured.

In a multi-story building, it is necessary to form a beam for each floor. For this reason, a precast concrete column having a connection part connecting beams is also provided. Even in a precast concrete column having such a connection portion, a connection member formed in a predetermined shape in advance is attached to a predetermined position between the outer frames and the inner frame is combined over the entire length, and then the outer inner frame It is manufactured by putting ready-mixed concrete into the gap formed between them and applying vibration.

[0004]

A concrete pillar in a building is sometimes used with its surface exposed. In such a case, the surface of the precast concrete column is preferably dense and smooth.
However, it is difficult to produce a precast concrete column with a dense and smooth surface by the method of adding fresh concrete between the outer and inner frames and applying vibration as in the above-mentioned prior art.

An object of the present invention is to provide a method for manufacturing a precast concrete column having a connection portion having a dense and smooth surface, and a formwork apparatus for manufacturing the precast concrete column.

[0006]

According to the present invention, there is provided a method for manufacturing a precast concrete column, comprising: a precast concrete column having a connection portion for connecting a beam of a building at a predetermined position in a longitudinal direction. A method of manufacturing a pillar, comprising fixing an inner formwork for forming a column portion of a precast concrete column inside an outer formwork, and forming a joint forming member having a predetermined shape and dimensions. The concrete is fixed, and the ready-mixed concrete is poured into the inside of the inner mold and the inside of the joint forming member while rotating the outer mold.

[0007] The formwork apparatus further comprises an outer formwork having rotating castings attached to the outer periphery of both ends, and a plurality of forms having dimensions and shapes corresponding to the column portions of the precast concrete columns and fixed inside the outer formwork. An inner formwork having a shape and dimensions corresponding to the connection part of the precast concrete column and having a connection part forming member sandwiched by the inner formwork and fixed to the outer formwork. Things.

[0008]

According to the method for manufacturing a precast concrete column, the surface of the precast concrete column having a connection can be formed densely and smoothly. That is,
The inner mold for forming the column portion of the precast concrete column is fixed inside the rotatable outer mold, and a predetermined shape and dimensions are formed in advance between these inner molds. While fixing the joint forming member, the outer mold is rotated, and while the inner mold and the joint forming member are respectively rotated, the ready-mixed concrete is put into the inner mold and the joint forming member. This makes it possible to form a precast concrete column in which the column portion and the connection portion are integrally formed by centrifugal molding. The surface of the precast concrete columns formed by centrifugation is dense and smooth. That is, it has a dense and smooth surface. The portion where the ready-mixed concrete is charged is the inside of the inner mold and the joint forming member, and this portion is formed in a hollow shape. Therefore, the poured ready-mixed concrete is uniformly distributed over the entire length of the precast concrete column, and the material of the column can be made uniform.

Further, according to the formwork apparatus, a precast concrete column can be manufactured by rationally performing the above manufacturing method. That is, by attaching the casting for rotation to the outer periphery of both ends of the outer mold, the outer mold can be mounted on the rotating wheel and rotated. Further, the inner mold and the joint forming member are configured to have a shape and dimensions corresponding to the column portion and the joint portion of the precast concrete column, respectively, and the inner mold is directly fixed to the outer mold,
In addition, since the joint forming member is fixed to the outer mold directly or sandwiched between the inner molds, when the outer mold is rotated, these inner mold and the joint are formed. The members can be rotated simultaneously. Therefore, a precast concrete column can be formed by putting ready-mixed concrete into the inside of the inner mold and the joint forming member while rotating the outer mold. Even if the position of the joint in the precast concrete column is at the longitudinal center of the precast concrete column, or if it is displaced in any direction, set the length of the inner formwork as appropriate Arrange the molding member between these inner molds, or arrange the molding member between inner molds having a predetermined length, and adjust the length of the inner mold by a partition ring. By adjusting, a desired precast concrete column can be formed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for manufacturing a precast concrete column and a formwork apparatus to which the above means are applied will be described below with reference to the drawings. 1 is a cross-sectional view of a formwork apparatus, FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, FIG. 3 is a cross-sectional view of a precast concrete column, FIG. 4 is a cross-sectional view of BB of FIG. C
6 is a sectional view taken along line DD of FIG. 3. The formwork apparatus 1 shown in FIGS. 1 and 2 has the column portions 2a, 2 shown in FIG.
This is a formwork device for centrifugally forming a precast concrete column 2 composed of a b and a connection 2c. The formwork apparatus 1 has a casting 3 for rotation on the outer periphery of both ends.
, An inner mold frame 5a fixed inside the outer mold frame 4 corresponding to the pillar portion 2a, an inner mold frame 5b corresponding to the pillar portion 2b, and a joint corresponding to the joint portion 2c. Part forming member 6
It is constituted by.

The casting 3 for rotation is formed in a ring shape, and is detachably attached to both ends of the outer mold frame 4. On the outer periphery of the casting 3, there is formed a tread surface 3a which is in contact with the rotary wheel 7, and a hole 3 is provided at the center for inserting a not-shown conveyer for putting ready-mixed concrete.
b is formed.

The outer formwork 4 is formed to have dimensions sufficiently larger than the length and thickness of the desired precast concrete column 2. The outer frame 4 is divided into two parts along the longitudinal direction, and is provided with connecting members 8 such as bolts and nuts.
And can be separated into a semicircle or a cylindrical shape. The outer mold 4 configured as described above has the same structure as a mold for forming a general fume tube.

The inner frames 5a and 5b are formed to have the same inner shape as the outer shapes of the column portions 2a and 2b of the precast concrete column 2, and the outer shape is formed to be the same as the inner shape of the outer frame 4. ing. The inner mold frames 5a and 5b are each divided into two along the longitudinal direction, and are configured to be fastened or separated using a coupling member 8 such as a bolt and a nut. The inner forms 5a and 5b are configured such that the length can be adjusted by attaching a partition ring 9 inside. The partition ring 9 regulates the thickness of the column portions 2a and 2b in the precast concrete column 2, has an outer shape equal to the inner shape of the inner forms 5a and 5b, and puts ready-mixed concrete into the center. Hole 9 for inserting the conveyor and defining the thickness of the pillar portions 2a, 2b
a is formed. Then, the partition ring 9 is attached to the inner mold 5
a, 5b and these inner molds 5a, 5b
It is configured so that it can be fixed by fastening b. In this embodiment, the precast concrete column 2 is formed in a cylindrical shape. Therefore, the inner shapes of the inner molds 5a and 5b are formed in a circular shape.

The port forming member 6 is a member for forming a port connecting the beam members of the building. The shape of the connection 2c in the precast concrete column 2 is determined according to the shape of the beam material in the target building, the connection method, and the like.
Therefore, the structure of the port 2c is not a single structure, but the port 2c having various structures is provided. For this reason, the joint forming member should not be limited to this embodiment described below, but should be appropriately set according to the connection method of the beam members. The terminal forming member 6 in the present embodiment is a terminal forming member 6 constituting a terminal 2c formed by connecting a beam (not shown) by welding.
Is used. That is, by forming the joint member 6 integrally with the precast concrete column 2, the joint member 6 forms the joint 2 c. The connection member 6 has a flange 6b welded to both ends of a prism 6a having a predetermined length, and has an outer diameter equal to the outer diameter of the column portions 2a, 2b of the precast concrete pillar 2 on both sides of the square flange 6b. Further, it is configured by welding a pipe 6c having a predetermined length.

Next, a procedure for manufacturing the precast concrete column 2 by the formwork apparatus 1 configured as described above will be described. First, the inner molds 5a and 5b are
It is divided, the connecting member 6 is sandwiched between these inner forms 5a, 5b, a partition ring 9 is attached at a predetermined position, and a reinforcing bar 10 is arranged inside the inner forms 5a, 5b and the connecting member 6. After the installation, the inner molds 5a and 5b are joined by the joining member 8. Thereby, the connection member 6 is formed by the inner molds 5a and 5b.
And can be integrally fixed.
Next, the outer mold frame 4 is divided into two, and the inner mold frames 5a and 5b and the connection member 6 which are integrally fixed inside the outer mold frame 4 are arranged. To conclude. At this time, since the outer diameters of the inner molds 5a and 5b are formed to have the same size as the inner diameter of the outer mold 4, the inner molds 5a and 5b are formed.
In addition, the connection member 6 can be fixed to the outer mold frame 4. As described above, the inner molds 5a, 5b
After fixing the joint member 6, the casting 3 is attached to both ends of the outer mold frame 4. Next, the outer mold frame 4 is placed on the rotating wheel 7, and while the wheel 7 is driven at a predetermined rotation speed, the ready-mixed concrete is placed inside the inner mold frames 5a, 5b and the connection member 6 from a conveyor (not shown). Then, the ready-mixed concrete is poured into a space defined by the inner molds 5a and 5b, the port member 6 and the partition ring 9, and the precast concrete column 2 can be centrifugally formed.

As shown in FIGS. 4 to 6, the cross-sectional shape of the precast concrete column 2 formed by centrifugation as described above is such that the outer shape of the column portion 2a, 2b is the inner form 5a, 5b.
Molded with the same size and shape as above, and a reinforcing bar 10 is provided at a predetermined position. The pipe 6c of the connection member 6
In the portion, the outer shape is defined by a pipe 6c of the connection member 6, and a reinforcing bar 10 is provided at a predetermined position. Further, the outer shape of the connection portion 2c is defined by the connection member 6, and a reinforcing bar 10 is provided at a predetermined position.

In the above-described embodiment, when forming the connecting portion 2c of the precast concrete column 2, the connecting member 6 is used to integrally form the member 6 with the column portions 2a and 2b. In the case where the mouth 2c is formed by embedding a female screw in the precast concrete column 2, a mold formed in the same manner as the inner molds 5a and 5b is used as the joint forming member 6, and the female mold is previously formed in this mold. It is also possible to fix the screw insert and integrally mold it.

[0018]

As described in detail above, according to the method for manufacturing a precast concrete column according to the present invention, the surface of the concrete column is made dense and compact by centrifugally forming the precast concrete column having a connection portion. It can be manufactured with a uniform material while being formed smoothly.

Further, according to the formwork apparatus of the present invention, a precast concrete column can be manufactured by rationally implementing the above manufacturing method. Also, even if the position of the joint in the precast concrete column is at the center in the longitudinal direction of the concrete column, or is displaced in any direction, the length of the inner formwork is set appropriately or set in advance. By adjusting the length of the inner mold frame having a predetermined length with a partition ring, a desired precast concrete column can be formed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a formwork device.

FIG. 2 is a view taken along the line AA of FIG. 1;

FIG. 3 is a sectional view of a precast concrete column.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is a sectional view taken along line CC of FIG. 3;

FIG. 6 is a sectional view taken along line DD of FIG. 3;

[Explanation of symbols]

1 is a formwork device, 2 is a precast concrete column, 2
a and 2b are pillar portions, 2c is a joint, 3 is casting, 4 is an outer mold, 5a and 5b are inner molds, 6 is a joint member,
7 is a rotating wheel, 8 is a connecting member, 9 is a partition ring, 10
Is a reinforcing bar.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mikio Watanabe 1-22-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Haneda Hume Pipe Co., Ltd. (72) Inventor Hiroetsu Serizawa 1--22 Nishi-Shinjuku, Shinjuku-ku, Tokyo No. 2 Inside Haneda Hume Tube Co., Ltd. (56) References JP-A-55-84613 (JP, A) JP-A-64-20104 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , (DB name) B28B 23/00 B28B 21/30 B28B 21/80 B28B 21/82

Claims (2)

(57) [Claims] 1. A method for manufacturing a precast concrete column having a connection portion for connecting a beam of a building at a predetermined position in a longitudinal direction, wherein a column portion of the precast concrete column is formed inside an outer formwork. While fixing the inner mold for fixing the joint forming member formed with a predetermined shape and size, while rotating the outer mold, the inside of the inner mold and the joint forming member of the joint A method for manufacturing a precast concrete column, characterized by placing ready-mixed concrete inside. 2. An outer mold having rotating castings attached to the outer periphery of both ends thereof, and a plurality of inner molds having shapes and dimensions corresponding to the pillar portions of the precast concrete columns and fixed inside the outer mold. A mold having a shape and dimensions corresponding to the joint of the precast concrete column, and a joint forming member fixed to the outer mold by being sandwiched by the inner mold. apparatus.