JPH0470436A - Mold form for precast concrete pillar - Google Patents

Abstract

PURPOSE:To contrive facilitation of mounting a mold form by foldably forming a PC mold form, integrally formed with a pillar by surrounding the periphery of a pillar core, through a hinge member and also fixing a junction surface by a connecting member. CONSTITUTION:A precast concrete mold form 10 of surrounding the periphery of a pillar core 40 is formed foldably in an axial direction and also burying a net 14, serving as a hinge member, in the outside of a folded part. Next, the PC mold form 10 is mounted from a side surface direction of the pillar core 40 to surround its periphery and fixed by a connecting member 48 of angle material or the like. The PC mold form 10 is integrally formed with a pillar by placing concrete in the PC mold form 10. In this way, execution work can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a precast concrete column formwork that covers the outside of and is integrated with a concrete column.

(Prior art) In recent years, when constructing columns for buildings, a precast hollow cylindrical concrete formwork is installed surrounding the outside of the core of the column, and concrete is poured into this formwork. There is a method of constructing a column that is integrated with this formwork by doing so, and the precast concrete column formwork used at this time is, for example, disclosed in Japanese Patent Publication No. 1-1.
This method has been proposed in Japanese Patent No. 30988, Japanese Utility Model Application No. 1-101148, and the like.

(Five problems to be solved by the invention) However, such conventional precast concrete column formwork is integrally formed as a hollow cylinder, and although it is possible to apply it to reinforced concrete columns, it cannot be applied to steel reinforced concrete columns. This made it impossible to apply.

That is, in the case of the former reinforced concrete column, the core part is composed of column main reinforcement and shearing auxiliary reinforcement, and it is possible to cover the precast concrete column form body from above this core part, but in the case of the latter steel reinforced concrete column, The core part is composed of a column steel frame, column main reinforcement, and shearing auxiliary reinforcement, and the beam steel frame is generally already attached to the column steel frame.

Therefore, in the case of a steel-framed reinforced concrete column, it is not possible to cover the precast concrete column formwork from above the core part because the horizontally projecting beam steel gets in the way. Therefore, when constructing such a steel-framed reinforced concrete column, However, it was necessary to rely on the conventional construction method using a wooden frame, which had the problem of requiring extra work to install and remove the wooden frame, which lengthened the construction period.

SUMMARY OF THE INVENTION In view of these conventional problems, an object of the present invention is to provide a precast concrete column formwork that can also be applied to steel reinforced concrete columns.

(Means for Solving Problem M) In order to achieve the above object, the precast concrete column formwork of the present invention divides a cylindrical formwork material surrounding the outer periphery of a column core into a plurality of pieces in the circumferential direction, Each divided frame unit is connected via a hinge member, and one of the divided surfaces is separated to enable the connected frame unit to be expanded, and on the other hand, a connecting member is used to connect the separated divided frames. It is constituted by providing.

(Function) With the above-described configuration, the precast concrete column formwork of the present invention is configured such that the precast concrete column formwork can be expanded by connecting a plurality of individual frames with a hinge member, so that it is easy to install the precast concrete column formwork. Sometimes, this precast concrete column formwork is rolled out and wrapped around the outer circumference of the column core.
Then, by connecting the separated divided surfaces with a connecting member, it is possible to construct a hollow cylindrical body.

Therefore, the precast concrete column formwork of the present invention can be attached from the side of the column core to surround the outside of the column core.

(Example) Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

That is, FIGS. 1 to 3 show a precast concrete column form 1o showing an embodiment of the present invention, FIG. 1 is a front view in an expanded state, FIG. 2 is a bottom view in an expanded state, and FIG. FIG. 6 is an enlarged bottom view of the main part in the unfolded state.

In this example, the precast concrete column formwork 1
The following will explain an example of a steel-framed reinforced concrete column to be constructed using 0, which has a substantially square cross section.

That is, the precast concrete column formwork 10 of this example
As shown in FIG. 1, four rectangular frame units 12 divided into four pieces are prepared corresponding to the outer shape of the steel reinforced concrete column, and these four frame units 12 are used as a net as a hinge member. 14 and are connected to each other via 14.

At this time, both ends of the four connected frames 12 are separated to form dividing surfaces 12g.

Further, both ends of each of the four frame units 2 are chamfered at an angle of 45 degrees over the entire thickness thereof, and three connecting portions 12 are provided between these frame units 12.
b is formed as a groove with an angle of 90 degrees by this chamfered portion.

The chamfered portion is formed on the surface where the frame unit 12 is located inside when the precast concrete column 10 is assembled as a hollow cylinder.

The net 14 is connected to the precast concrete column formwork 1
0, and is also used for reinforcing the formwork 10 itself.

The net 14 may be an ordinary wire mesh, but by forming it using a high-strength material such as glass fiber or carbon fiber, the strength of the formwork 10 can be significantly improved, and each The frame unit 12 can be made thinner.

By the way, as shown in FIG. 3, the net 14 is buried in the general part of the frame unit 12 at approximately the center in the thickness direction, but it is bent so that it is arranged in a groove at each connecting part 12b. The portion disposed in this groove substantially becomes a hinge portion.

In addition, bolt anchors 16 are planted in the vicinity of the dividing surfaces 12a at both ends of the precast concrete column formwork 10 for attaching angle members 48, which will be described later, to connect these dividing surfaces.

In the precast concrete column form 10 of this embodiment, as shown in FIG. 1, a notch 12C is formed at the upper end of each frame unit 12 to allow the beam steel frame and the like to escape.

FIG. 4 shows an embodiment of the apparatus for forming the precast concrete column form 0, in which a frame body 20 is formed by a horizontal bottom plate 20a and a side plate 20b erected on the peripheral edge of the horizontal bottom plate 20a. On the bottom surface of the frame 20, a face plate 22.degree. 22a for forming chamfers at both ends of the frame unit 12 is arranged, and a net 14 is also arranged.

Incidentally, as shown in FIG. 5, the hinge portion of the net 14 is placed above the top of the face piece 22.

Then, concrete is poured into the frame 20 in which the face wood 22 and the net 14 are arranged up to the top of the face wood 22, 22a, and after this concrete is hardened, the frame 20 and the face wood are placed. By separating from 2222a, the precast concrete column form 10 can be formed.

In addition, FIG. 6 shows the precast concrete column formwork 1.
This device uses a centrifugal molding method to form an inner mold 3 at an appropriate interval at an inner corner of a centrifugal molding frame 30 whose inner space has a square cross section.
2 is disposed, and an edge cutting plate 34 is disposed between the top of the inner formwork 32 and a part of the inner corner.

Further, a net 14 is disposed along the inside of the centrifugal molding frame 30 and between this and the inner molding frame 32, and the net 14 is located at three corners except for one corner. As shown in the figure, it is arranged through the outer tip of the edge cutting plate 34.

By pouring concrete into the inner space of the centrifugal molding frame 30, the centrifugal force generated when the centrifugal molding frame 30 is rotated causes the concrete to move between the frame 30 and the inner frame 32. The frame 30. By separating the inner formwork 32 and the edge cutting plate 34, the precast concrete column formwork 10 is formed.

By the way, the precast concrete column form 10 having such a configuration is attached to the outside of the core 4° of a steel reinforced concrete column by the method shown in FIGS. 8 and 9.

That is, the steel reinforced concrete column has a steel frame 42 in the center.
．． Column main reinforcement 44. The precast concrete column form 10 is provided with a column core 40 consisting of shearing auxiliary reinforcements 46 and is constructed by filling the outer side of the column core 4o with concrete, and the precast concrete column form 10 is expanded as shown in FIG. The formwork 10 is wrapped around the outer periphery of the column core 40 in this state.
The dividing surfaces 12a at both ends are finally brought into contact with each other.

Then, on the outside of the corner of the abutted dividing surface 12a,
An angle member 48 as a connecting member is arranged, and by screwing this angle member 48 to the bolt anchor 16 via a bolt 50, the dividing surface 12 is fixed as shown in FIG.
A are connected and fixed to each other.

Therefore, in this state, the precast concrete column form 10 is configured as a hollow cylinder and is arranged to surround the outside of the column core 40.

After the precast concrete column form 10 is placed surrounding the column core 40 in this way, concrete is poured into the precast concrete column form 10 to integrate it with the form 10. Steel reinforced concrete columns can be constructed.

As described above, in the precast concrete column formwork 10 of this embodiment, the four frames 12 are connected to each other via the net 14 so that they can be expanded, and in the expanded state, the column core 40 Since the precast concrete column formwork 10 is made to go around the outer periphery of the column core 40 and surround it, it is possible to surround the column core 40 without having to cover it from above with the precast concrete column form 10.

Therefore, in cases where a beam steel frame (not shown in this example) is already attached to the column steel frame, such as a steel reinforced concrete column, the precast concrete column formwork is placed above the column core 40. In cases where it is not possible to cover the concrete column with a steel frame and reinforced concrete column, the precast concrete column form 10 of this embodiment can be used to construct a steel reinforced concrete column.

In addition, although the precast concrete column form 10 of this embodiment can exhibit particularly excellent effects when used for steel-framed reinforced concrete columns, the precast concrete column formwork 10 of this embodiment can also be used for reinforced concrete columns that do not use a steel frame for the column core. It goes without saying that concrete column formwork 10 can be used.

In addition, the precast concrete column form 10 of this example is made by connecting four flat plate-shaped frame bodies 12 for the purpose of illustrating the case where the steel reinforced concrete column using this has a square cross section. However, the number and shape of the frame bodies 12 can be arbitrarily determined depending on the outer shape of the column to be constructed, and the present invention is not limited thereto.
For example, for a pentagonal column, five frame bodies can be used, and for a circular cross section, the frame bodies can be formed in an arc shape to correspond to each other.

(Effects of the Invention) As explained above, in the precast concrete column form of the present invention, the frame body which is divided into a plurality of parts in the circumferential direction is connected via a hinge member to make it expandable,
In addition, since the separated divided surfaces are connected via the connecting member, the precast concrete column formwork can be wrapped around the outer circumference of the column core in an expanded state.
It can surround the outside of the column core.

Therefore, the columns can be constructed using precast concrete column formwork, which has the excellent effect of shortening the construction period.

[Brief explanation of the drawing]

Fig. 1 is an exploded front view of an embodiment of the precast concrete column form according to the present invention, Fig. 2 is an unfolded bottom view of the precast concrete column form of an embodiment of the invention, and Fig. 3 is FIG. 2 is an enlarged view of the essential parts of the bottom view; FIG. 4 is a sectional view showing an embodiment of the precast concrete column form forming apparatus of the present invention; FIG. 5 is an enlarged sectional view of the essential parts of FIG. 4;
FIG. 6 is a sectional view showing another embodiment of the precast concrete column form forming apparatus of the present invention, FIG. 7 is an enlarged sectional view of the main part of FIG. 6, and FIG. 8 is a precast concrete column form forming apparatus according to the present invention. FIG. 9 is a perspective view showing how the formwork is installed, and FIG. 9 is a plan view showing how the precast concrete column formwork is installed according to the present invention. Fig. 1 10...Precast concrete column form 12...Frame form body 12a...Dividing surface 14...Net (hinge member) 40...Column core 48...Angle material (connection member)

Claims (1)

[Claims] The cylindrical formwork that surrounds the outer periphery of the column core is divided into multiple parts in the circumferential direction, and each divided frame is connected via a hinge member, and one of the divided surfaces is separated to make this connection. A precast concrete column form is characterized in that a single frame can be expanded, and a connecting member is provided to connect the separated divided surfaces.