JPH0663351B2 - Inner formwork for concrete - Google Patents

Description

TECHNICAL FIELD The present invention relates to an inner formwork for concrete suitable for forming a tubular concrete product.

(Prior art) A tubular inner formwork is surrounded by an outer formwork, concrete is driven into a gap between the inner formwork and the outer formwork, and after the concrete is solidified, the inner and outer formwork are removed. Techniques for obtaining tubular concrete products are well known.

These inner and outer molds are appropriately divided in consideration of removal, and usually bolted at the time of assembly.

Since the outer formwork is located outside the tubular concrete product, it is easy for the worker to lean on it, so it is easy to remove the form.

On the other hand, since the inner formwork is located inside the concrete product, it is difficult for workers to come close to it and it takes time to release the mold.

(Problems to be Solved by the Invention) When molding a plurality of concrete products, it is difficult to assemble and disassemble the inner formwork, which deteriorates workability and increases work time.

Therefore, there is a demand for an inner formwork that is as easy to handle as the outer formwork and has good workability.

(Means for Solving the Problem) In order to meet the above-mentioned demand, the present invention comprises a vertically-oriented inner formwork composed of a drive panel and a driven panel divided from a tubular shape,
The opposing surfaces of the drive panel and the driven panel are tapered walls that are inclined with respect to the vertical line, and one of the drive panel and the driven panel is provided with a guide roller that abuts against the back surface of the other panel tapered wall. It is characterized in that the driven panel is pushed or pulled with respect to the drive panel by moving up and down.

(Operation) The drive panel is moved to pull the driven panel. The drawn wall panel has a smaller cross-section or diameter than the initial inner form, and comes off the concrete inner surface.

When the moved drive panel is returned to its original position, the drive panel pushes out the driven panel and restores the original inner formwork.

Therefore, the inner frame does not require fastening / separation of bolts / nuts, and does not need to separate the panels.

(Example) The Example of this invention is described below based on an accompanying drawing.

FIG. 1 is a plan view of a concrete formwork according to the present invention.

The concrete formwork 1 includes a frame base 2 placed on the ground,
It is composed of an outer mold 3 and an inner mold 10 placed on the frame base 2.

The outer formwork 3 has wide outer panels 4,4 and slightly narrow inner panels 5,5.
FIG. 2 is a perspective view of the outer form frame as seen from the direction A in FIG.
The structure of the outer mold 3 will be described in detail with reference to the drawings.

The outer panel 4 is a frame body in which a rectangular flat plate 4a is framed with a frame 4b and reinforced with ribs 4c.

Similarly, the inner panel 5 is a frame body including a flat plate 5a, a frame 5b, and a rib 5c.

These outer panels 4, 4 and inner panels 5, 5 are imaginary lines D1 in FIG.
Build in the direction of the arrow from the position shown in, align the corners of each other, and connect with clampers 6 ...

FIG. 3 is a sectional view taken along line B in FIG. 2. The clamper 6 includes an eccentric shaft 6a provided on the outer panel 4 side, a claw member 6b pivotally supported by the eccentric shaft 6a, and an eccentric shaft 6a. It is composed of a lever 6c for manually rotating and a pin 6d provided on the inner panel 5 side.

Set the lever 6c to the position shown in the phantom line D2 and manually press the nail material 6b.
When the lever 6c is rotated in the direction of the arrow, the eccentric shaft 6a is eccentric and the claw member 6b is moved downward in the drawing.

The claw material 6b strongly engages with the pin 6d to form a strong outer mold 3.

On the other hand, as shown in FIG. 1, the inner mold 10 is composed of a relatively small drive panel 11, 11 and a driven panel 12, 12 larger than the drive panel 11, 11 which form a rectangular tube.

4 is a partial perspective view of the inner mold form as viewed in the direction of arrow C in FIG. 1, and the drive panel 11 has tapered flat plates 11a and 11a that spread downward and these flat plates at right angles as shown in FIG. Tapered walls 11b extending vertically at the left and right edges after butt joining,
11b and ribs 11c ... Reinforcing the tapered walls and the flat plates 11a, 11a.

A drive panel moving mechanism 13 including a rotary shaft 13a, a lever 13b, a connecting rod 13c, and pins 13d and 13d is attached to a lower portion of the drive panel 11 which has a tapered wedge shape. The rotary shaft 13a is supported by the frame base 2.

Like the drive panel 11, the driven panel 12 includes a flat plate 12a, a tapered wall 12b, and ribs 12c. In the figure, 12e ... is a stopper member and is driven by concrete pressure.
It works to prevent 11 from protruding inward.

Further, the flat plates 12a, 12a of the driven panels 12, 12 are slightly projected to the drive panel 11, and these projections prevent the drive panel 11 from protruding outward.

The taper wall 11b of the drive panel and the taper wall 12b of the driven panel facing the drive panel abut on each other at the taper wall front surfaces 11d, 12d (see FIG. 5), and the guide member is provided so as to straddle the taper walls 11b, 12b. 14 ... are arranged.

As shown in FIG. 5 which is a sectional view taken along line DD of FIG. 4, these guide members 14 ... For example, the bracket 14a is welded to the driven panel 12, and the bolt long hole 14b is inserted into the bracket 14a.
The roller support plate 14c provided with is bolted, and the guide roller 1 is rotatably attached to the roller support plate via the stepped shaft 14d.
5 is attached.

The guide roller 15 moves while rotating the taper wall rear surface 11e of the drive panel.

The operation of the concrete formwork having the above configuration will be described below.

First, the inner mold 10 is set on the frame base 2 placed on the ground as shown in FIG. That is, the rotating shaft 13a of the moving mechanism 13 is rotated by a hydraulic jack, a mechanical jack, a motor or human power (not shown), and the tapered drive panel 11 is raised via the lever 13b and the connecting rod 13c.

The taper walls 11b, 11b of the drive panel move upward while slidingly contacting the taper walls 12b, 12b of the driven panel facing each other.
It makes a so-called wedge action that pushes out 12. Drive panel 11,11
Is stopped when it reaches a predetermined height, and the drive panels 11, 11 are treated so as not to go down.

Further, the outer formwork 3 is combined in the above-described procedure to complete the assembly of the concrete formwork 1.

Concrete is poured into the gap between the outer mold 3 and the inner mold 10 and waits for the concrete to solidify.

After the concrete is solidified, the clampers 6 are removed, and the outer panels 4 and 4 and the inner panels 5 and 5 of the outer mold are tilted outward to remove the outer mold 3.

On the other hand, the drive panel 11 of the inner mold form 10 is pulled down by the moving mechanism 13.

When the drive panel 11 descends, the drive panel taper wall 11b
Tries to separate from the taper wall 12b of the driven panel facing each other. However, the tapered walls 11b, 11 of the drive panel shown in FIG.
When b tries to move in the + X or + Y direction shown in the drawing, these back surfaces 11e, 11e push the guide rollers 15, 15 and the guide rollers 15, 15 are connected to the driven panels 12, 12, so that the driven panels 12, 12 will be pulled in the + Y or + X direction.

As a result, the inner formwork 10 becomes a small rectangle and is removed from the concrete.

If this concrete product is hoisted by an appropriate hoisting means, the die cutting can be completed easily.

And since the guide roller 15 is adopted, the drive panel
The acting force required to move 11 is small, so that the moving mechanism 13 can be downsized.

Although the present embodiment has been described with respect to a rectangular inner mold, the present invention is not limited to this, and the present invention may be applied to various inner molds having a cylindrical shape such as a circle or an ellipse.

Further, the drive panel 11 may be a taper type that spreads upward or a so-called one-side taper type in which only one of the left and right tapered walls is inclined.

Further, the guide rollers 15 may be provided so as to be connected to the drive panel 11.

(Effects of the Invention) As described above, according to the present invention, the driven panel can be moved simply by moving the driving panel up and down. The frame can be reduced in diameter and removed from the concrete. On the contrary, the driven panel is pushed out by the driven panel to expand the inner formwork and assemble the formwork. Therefore, the inner formwork does not require fastening / separation of bolts / nuts and the panels do not have to be separated from each other, and can be easily and quickly removed from the concrete product, and can be reconstructed very easily. The efficiency and the working time can be shortened, and a remarkable effect is exerted particularly in the mass production process.

[Brief description of drawings]

FIG. 1 is a plan view of a concrete formwork according to the present invention, and FIG.
1 is a perspective view seen from the direction A in FIG. 1, FIG. 3 is a sectional view taken along line B in FIG. 2, FIG. 4 is a view taken in the direction of arrow C in FIG. 1, and FIG. 5 is DD in FIG. FIG. 1 ... Concrete formwork, 3 ... Outer formwork 10 ... Inner formwork, 11 ... Drive panel 11b ... Same taper wall, 11e ... Tapered wall back surface 12 ... Follower panel, 12b ... Same taper Wall 15 ... Guide roller

Claims (1)

[Claims] 1. A concrete for forming and manufacturing a concrete product by enclosing a vertically-arranged cylindrical inner formwork with an outer formwork and driving concrete into a gap between the inner formwork and the outer formwork. In the mold, the inner mold is composed of a drive panel and a driven panel divided from a cylindrical shape, and the facing surfaces of the drive panel and the driven panel are tapered walls inclined with respect to a vertical line,
One of the drive panel and the driven panel is provided with a guide roller that comes into contact with the back surface of the tapered wall of the other panel, and is configured to push or pull the driven panel with respect to the drive panel by vertically moving the drive panel. An inner formwork for concrete.