JPH04319407A - Manufacture of precast concrete pillar and mold device - Google Patents

Abstract

PURPOSE:To provide the manufacturing method of a precast concrete pillar having the dense and smooth surface and a joint section for bonding beams of a building and also provide a mold device. fixing CONSTITUTION:A mold device 1 is constituted by fixing a plurality of inner molds 5a and 5b corresponding to pillar sections 2a and 2b of a precast concrete pillar 2 in an outer mold provided with castings for rotation on both ends movably and disposing a joint section 2c molding component between said inner molds and fixing thereon. While said mold device 1 is rotated, ready mixed concrete is placed in the inner molds 5a and 5b and also in the joint section 2c molding component and the precast concrete pillar 2 is centrifugally molded.

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 and a formwork apparatus having joints for connecting beams of a building.

0002

[Prior Art] When constructing a building with concrete columns, a formwork is constructed around the steel frame or reinforcing bars according to the desired shape of the column, and ready-mixed concrete is poured into the formwork. is common. However, recently, in order to save labor in assembling and dismantling the formwork for constructing columns, hollow concrete pipes, which are pre-produced in factories, are being used.
A so-called precast concrete column is used as a formwork, reinforcing bars or steel frames are placed inside the precast concrete column, and ready-mixed concrete is poured, and the poured ready-mixed concrete and precast concrete column are integrated into a concrete structure. Constructing pillars is being done. Precast concrete columns such as the one described above are made by combining an outer frame according to the outer shape of the column and an inner frame according to the inner shape, and by pouring fresh concrete into the gap formed between these outer and inner frames, and vibrating. Manufactured with.

[0003] In multi-story buildings, it is necessary to construct beams for each story. For this reason, precast concrete columns are also provided that have joints for connecting beams. Even in the case of a precast concrete column having such a joint part, a joint member formed in a predetermined shape is attached to a predetermined position between the outer frames, and the inner frame is assembled along the entire length, and then the outer and inner frames are assembled. It is manufactured by pouring fresh concrete into the gap formed between the concrete and applying vibrations.

0004

[Problems to be Solved by the Invention] Concrete columns in buildings are sometimes used with their surfaces exposed. In such a case, the surface of the precast concrete column is preferably dense and smooth. However, with the above-mentioned conventional method in which fresh concrete is placed between the outer and inner frames to impart vibration, it is difficult to manufacture the precast concrete column with a dense and smooth surface.

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

[0006]

[Means for Solving the Problems] In order to solve the above-mentioned problems, a method for manufacturing a precast concrete column according to the present invention provides a precast concrete column having a joint part for connecting beams of a building at a predetermined position in the longitudinal direction. A method for manufacturing a column, comprising fixing an inner formwork for forming a column part of a precast concrete column inside an outer formwork, and also fixing a joint part forming member formed with a predetermined shape and dimensions. The method is characterized in that ready-mixed concrete is placed inside the inner formwork and the joint forming member while the outer formwork is fixed and the outer formwork is rotated.

[0007] The formwork device also includes an outer formwork with rotary castings attached to the outer periphery of both ends, and a plurality of outer formworks having a shape and dimensions corresponding to the column part of the precast concrete column and fixed inside the outer formwork. and a joint part forming member having a shape and dimensions corresponding to the joint part of the precast concrete column, and which is sandwiched between the inner form and fixed to the outer form. It is something that

[0008]

[Operation] According to the method for manufacturing a precast concrete column described above, the surface of a precast concrete column having a joint part can be formed to be dense and smooth. That is,
An inner formwork for forming a column part of a precast concrete column is fixed inside an outer formwork configured to be rotatable, and a precast concrete column is formed between these inner forms to have a predetermined shape and dimensions. The joint molding member is fixed, the outer form is rotated, and the inner formwork and joint molding member are rotated, respectively, and ready-mixed concrete is poured into the inner formwork and the joint molding member. By doing so, it is possible to form a precast concrete column in which the column part and the joint part are integrally centrifugally formed. The surface of centrifugally formed precast concrete columns is dense and smooth. That is, it has a dense and smooth surface. Further, the part into which fresh concrete is poured is inside the inner formwork and the joint part forming member, and this part is configured in a hollow shape. Therefore, the poured concrete is uniformly distributed over the entire length of the precast concrete column, and the material of the column can be made uniform.

[0009] Furthermore, according to the above-mentioned formwork apparatus, a precast concrete column can be manufactured by rationally carrying out the above-mentioned manufacturing method. That is, by attaching rotating castings to the outer periphery of both ends of the outer form, the outer form can be placed on a rotating wheel and rotated. Further, the inner formwork and the joint part forming member are configured to have shapes and dimensions corresponding to the column part and the joint part of the precast concrete column, respectively, and the inner formwork is directly fixed to the outer formwork,
In addition, since the connecting part forming members are fixed to the outer formwork directly or by being sandwiched between the inner formwork, when the outer formwork is rotated, the inner formwork and the connecting part forming member are fixed to the outer formwork. The members can be rotated at the same time. Therefore, a precast concrete column can be formed by pouring fresh concrete into the inner formwork and the joint forming member while rotating the outer formwork. Even if the position of the joint in the precast concrete column is at the center in the longitudinal direction of the precast concrete column, or if it is displaced in either direction, the length of the inner formwork should be set appropriately and A joint molding member is arranged between these inner forms, or a joint molding member is arranged between inner forms having a predetermined length, and the length of the inner form is determined by a partition ring. By making adjustments, it is possible to form the desired precast concrete column.

0010

[Embodiment] An embodiment of a method of manufacturing a precast concrete column and a formwork apparatus to which the above-mentioned means are applied will be described below with reference to the drawings. 1 is a sectional view of the formwork device, FIG. 2 is a sectional view taken along the line A-A in FIG. 1, FIG. 3 is a sectional view of a precast concrete column, FIG. 4 is a sectional view taken along BB in FIG. C of
-C sectional view, and FIG. 6 is a DD sectional view of FIG. The formwork device 1 shown in FIGS. 1 and 2 has column parts 2a and 2 shown in FIG.
This is a formwork device for centrifugally forming a precast concrete column 2 constituted by a joint part 2c and a joint part 2c. The formwork device 1 has rotating castings 3 on the outer periphery of both ends.
an outer formwork 4 with attached thereto, an inner formwork 5a fixed inside the outer formwork 4 and corresponding to the pillar part 2a, an inner formwork 5b corresponding to the pillar part 2b, and a shisha mouth corresponding to the shisha part 2c. Part molding member 6
It is made up of.

The rotating casting 3 is formed into a ring shape and is detachably attached to both ends of the outer formwork 4. A tread surface 3a is formed on the outer periphery of the casting 3, and a tread surface 3a that comes into contact with the rotary wheel 7 is formed, and a hole 3 is provided in the center for inserting a conveyor for feeding fresh concrete (not shown).
b is formed.

The outer formwork 4 is formed to have dimensions sufficiently larger than the length and thickness of the target precast concrete column 2. This outer formwork 4 is divided into two parts along the longitudinal direction, and connecting members 8 such as bolts and nuts
It is constructed so that it can be fastened into a cylindrical shape or separated into a semicircular shape. The outer mold 4 constructed as described above has a structure similar to that of a mold for molding a general Hume tube.

Inner formworks 5a and 5b are formed to have an inner shape that is equal to the outer shape of column portions 2a and 2b of precast concrete column 2, respectively, and an outer shape that is equal to the inner shape of outer formwork 4. ing. The inner forms 5a and 5b are each divided into two parts along the longitudinal direction, and are configured to be fastened or separated using connecting members 8 such as bolts and nuts. The inner forms 5a and 5b are configured so that their lengths can be adjusted by attaching a partition ring 9 inside. The partition ring 9 defines the thickness of the column parts 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 has ready-mixed concrete poured into the center. Holes 9 into which the conveyor is inserted and which define the thickness of the column parts 2a and 2b
a is formed. Then, the partition ring 9 is attached to the inner formwork 5a.
, 5b, and place these inner formworks 5a, 5b at predetermined positions.
It is configured so that it can be fixed by fastening. In this embodiment, the precast concrete column 2 is formed into a cylindrical shape. Therefore, the inner shapes of the inner molds 5a and 5b are circular.

The joint forming member 6 is a member for forming a joint that connects the beams of a building. The shape of the joint portion 2c in the precast concrete column 2 is determined depending on the shape of the beam material in the target building, the connection method, etc. Therefore, the structure of the joint part 2c is not uniform, and joint parts 2c having various structures are provided. Therefore, the joint molding member should not be limited to the present embodiment described below, but should be appropriately set according to the connection method of the beam members. The joint part molding member 6 in this embodiment is a joint member 6 that constitutes a joint part 2c that is configured to connect a beam material (not shown) by welding.
is used. That is, by integrally molding the joint member 6 with the precast concrete column 2, the joint member 6 constitutes the joint portion 2c. The joint member 6 has square flanges 6b welded to both ends of a square column 6a having a predetermined length, and has an outer diameter equal to the outer diameter of the column parts 2a and 2b of the precast concrete column 2 on both sides of the square flange 6b. Moreover, it is constructed by welding a pipe 6c having a predetermined length.

Next, the procedure for manufacturing the precast concrete column 2 using the formwork apparatus 1 constructed as described above will be explained. First, the inner formworks 5a and 5b are each
The inner formworks 5a, 5b are divided into two parts, a joint member 6 is sandwiched between them, a partition ring 9 is attached at a predetermined position, and reinforcing bars 10 are placed inside the inner formworks 5a, 5b and the joint member 6. After setting, the inner forms 5a and 5b are connected by the connecting member 8. As a result, the inner formwork 5a, 5b allows the joint member 6 to
It is possible to sandwich and fix them integrally. Next, the outer form 4 is divided into two parts, and after arranging the inner forms 5a, 5b and the joint member 6 that are integrally fixed inside the outer form 4, the outer form 4 is attached to the connecting member 8. This is hereby concluded. At this time, since the outer diameter of the inner formworks 5a, 5b is molded to have the same dimension as the inner diameter of the outer formwork 4, the inner formworks 5a, 5b
It is also possible to fix the joint member 6 to the outer formwork 4. After the inner forms 5a, 5b and the joint member 6 are fixed inside the outer form 4 as described above, the castings 3 are attached to both ends of the outer form 4. Next, the outer formwork 4 is placed on the rotary wheel 7, and while the wheel 7 is driven at a predetermined rotation speed, fresh concrete is poured from a conveyor (not shown) into the inner formworks 5a, 5b and the joint member 6. When the fresh concrete is poured into the space formed by the inner forms 5a, 5b, the partition member 6, and the partition ring 9, it is possible to centrifugally form the precast concrete column 2.

As shown in FIGS. 4 to 6, the cross-sectional shape of the precast concrete column 2 centrifugally formed as described above has the outer shape of the inner formworks 5a and 5b in the column portions 2a and 2b.
It is molded to have the same size and shape, and reinforcing bars 10 are placed at predetermined positions. Also, the pipe 6 of the joint member 6
In part c, the external shape is defined by the pipe 6c of the joint member 6, and reinforcing bars 10 are provided at predetermined positions. Further, the external shape of the joint portion 2c is defined by the joint member 6, and reinforcing bars 10 are provided at predetermined positions.

In the above-mentioned embodiment, when forming the joint part 2c of the precast concrete column 2, the joint member 6 was integrally molded with the column parts 2a and 2b. When forming the opening part 2c by embedding female screws in the precast concrete column 2, use a formwork formed in the same manner as the inner formworks 5a and 5b as the joint part forming member 6, and insert a female thread into this formwork in advance. It is also possible to fix the screw insert and mold it in one piece.

[0018]

[Effects of the Invention] As explained in detail above, according to the method of manufacturing a precast concrete column according to the present invention, by centrifugally forming a precast concrete column having a joint part, the surface of the concrete column can be made dense and fine. It can be formed smoothly and manufactured with uniform material.

Further, according to the formwork apparatus according to the present invention, a precast concrete column can be manufactured by rationally carrying out the above manufacturing method. Furthermore, even if the position of the joint in a precast concrete column is at the center in the longitudinal direction of the concrete column or is displaced in either direction, the length of the inner formwork can be set appropriately or preset. By adjusting the length of the inner formwork with a certain length using a partition ring, a desired precast concrete column can be formed.

[Brief explanation of drawings]

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

FIG. 2 is a view taken along the line A-A in FIG. 1;

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

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

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

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

[Explanation of symbols]

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

Claims (2)

[Claims] [Claim 1] A method for manufacturing a precast concrete column having a joint part for connecting a building beam at a predetermined position in the longitudinal direction, the method comprising forming a column part of the precast concrete column inside an outer formwork. At the same time, fix the inner formwork for the purpose and fix the joint molding member formed to have a predetermined shape and dimensions, and while rotating the outer formwork, A method for manufacturing a precast concrete column characterized by pouring ready-mixed concrete inside. 2. An outer formwork with rotation castings attached to the outer periphery of both ends, and a plurality of inner formworks having shapes and dimensions corresponding to the column parts of the precast concrete columns and fixed inside the outer formwork. and a joint part forming member having a shape and dimensions corresponding to the joint part of a precast concrete column, and which is held between the inner formwork and fixed to the outer formwork. Device.