JPH036883B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing concrete pipes or concrete piles.

Conventionally, concrete pipes or concrete piles are manufactured by centrifugal forming. In this manufacturing method using centrifugal force forming, for example, the first
A formwork 1 as shown in Figures a and b was used, and an apparatus as shown in Figure 2 was used. In the conventional manufacturing method, first, the formwork 1 is placed on the rollers 2 at the positions of the wheels 3, 3. A motor 4 is used as the drive source,
The rotational force of the motor 4 is transmitted to the roller 2 via the belt 5.
to communicate. As a result, a rotational force is applied to the wheels 3, 3 in contact with the roller 2, the formwork 1 is rotated, and a centrifugal force is applied to the formwork 1. The formwork 1 is divided into two parts, and after curing is completed, the formwork insertion part 6
After removing the bolts or metal fittings 7, the formwork 1 was divided into two and the product was taken out.

However, the above-mentioned conventional manufacturing method using centrifugal force forming has drawbacks such as extremely large noise generated between the roller 2 and the wheel 3 in contact therewith, and severe wear and tear on the roller 2 and the wheel 3. .

The present invention has been made in view of the above circumstances, and is designed so that the frame wall has a 1/2
Using a formwork 11 without an insertion part with a taper of about 500 to 1/2000 or a formwork 21 made by matching the formwork 11 on the thicker diameter side, the formwork 1
1 or 21 is placed on the belt 17, and by running the belt 17, the formwork 11 or 21 is rotated to centrifugally form a concrete pipe or concrete pile. The present invention provides a method for manufacturing a concrete pipe or concrete pile, which comprises pulling out or extruding the molded concrete pipe or concrete pile, and then demolding the concrete pipe or concrete pile.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 3a shows a formwork 11 used in an embodiment of the method for producing concrete pipes or concrete piles according to the present invention. The formwork 11 does not have an insertion part, and the frame wall is tapered by about 1/500 to 1/2000 so that the inner diameter increases from the front 11' to the rear 11''. Since it does not have a joint part, it is possible to prevent cement slurry from flowing out, improving the quality of the product, and eliminating the need for fixing work with insertion bolts.

FIG. 4 shows a device that applies centrifugal force to the formwork 11, and in the figure, 12 is a drive motor, 13, 14
is a pulley, and 15 is a tension pulley. The rotational force of the drive motor 12 is transmitted to the pulley 13 via the transmission belt 16, and the rotation of the pulley 13 causes the formwork rotation belt 17 to travel. Appropriate tension is applied to the formwork rotating belt 17 by a tension pulley 15. In addition, 18 is formwork 1
This is a regulating roller for regulating 1.

When manufacturing a concrete pipe or concrete pile using the formwork 11, first, formwork 1
Apply a mold release agent to the inner surface of 1. Next, reinforcing bars etc. are installed in the part 19, and end rings 20,
20 to complete the mold assembly.

After the mold assembly is completed, the formwork rotation belt 1
The formwork 11 is placed between the pulleys 13 and 14 of No. 7. When the drive motor 12 is rotated, the formwork rotating belt 17 runs as described above, and the formwork 11 also rotates accordingly. At this time, the formwork 11 is regulated by the front and rear regulating rollers 18, and does not fly out in the front-back direction (FIG. 3a). Centrifugal force is generated by the rotation of the formwork 11, and the concrete inside is compacted.

After compaction, steam curing is performed, end rings 20 are removed, and formwork 1 is closed using hydraulic pressure.
Either the product 19 is pulled out in a defensive manner, or the product 19 is pushed out in the direction C, and the product 19 is pulled out in a loose state using a winch or demolding machine. As mentioned above, since the frame wall is tapered, demolding is easy.

In the above embodiment, since the formwork 11 is given a rotational force through the formwork rotation belt 17, noise is significantly reduced. In addition, since the formwork 11 without an insertion part is used,
Conventional wheels are also not required. Furthermore, since the formwork 11 is in contact with the relatively flexible formwork rotation belt 17, there is little wear and the formwork can withstand long-term use. moreover,
The compaction of concrete in the formwork 11 is faster than before due to the slight vibrations caused by the running of the formwork rotation belt 17. For example, for a 400φ pile, what would take 8 minutes with the conventional method takes 5 minutes with the present invention.

FIG. 3b shows another formwork 21 for use in the method for producing concrete pipes or concrete piles according to the invention. The formwork 21 has end portions 22 and 23 having the same diameter, and has a structure in which the formwork 11 shown in FIG. 3a is joined at the thicker diameter side. When connecting concrete pipes, it is sometimes required that the diameters of the ends of the pipes be the same, and the purpose of the present invention is to provide concrete pipes that meet this requirement.

The formwork 21 is placed on two formwork rotation belts 17 during compaction. D and E when demolding
Pull out the left and right formwork 21 from the direction.

In the formwork 21, the tapers of the frame walls of the left and right formworks are in opposite directions, so that the formwork 21 is stabilized when rotation for centrifugal force forming is applied, and the formwork rotation belt 17
It will be located at the top. This is because the force in the thrust direction due to the tapered frame wall is offset.

As described above, the method for manufacturing a concrete pipe or concrete pile according to the present invention uses a formwork rotation belt to rotate the formwork, and further includes:
Since the formwork 11 without an insertion part or the formwork 21 made by matching the formwork 11 with the thicker diameter side is used, conventional wheels are no longer necessary, etc.
This eliminates all the conventional inconveniences and is useful in practice.

[Brief explanation of the drawing]

Figure 1a is a side view of the formwork 1 used in the conventional concrete pipe or concrete pile manufacturing method, Figure 1b is a sectional view taken along line A-A in Figure 1a, and Figure 2 is the conventional method. Figures 3a and b are cross-sectional views of the formwork used in the method for manufacturing concrete pipes or concrete piles according to the present invention; The figure is a conceptual diagram of an apparatus used in the method for manufacturing a concrete pipe or concrete pile according to the present invention. 1, 11, 21...Formwork, 2...Roller, 3...
... Wheels, 4, 12 ... Motor, 6 ... Formwork insertion part, 13, 14 ... Pulley, 15 ... Tension pulley, 17 ... Formwork rotation belt, 1
8... Regulatory roller.

Claims (1)

[Claims] 1 A formwork 11 without an insertion part whose frame wall is tapered by about 1/500 to 1/2000 so that the inner diameter widens from the front to the rear, or a formwork made by matching the formwork 11 on the thicker diameter side. 21, place the formwork 11 or 21 on the belt 17,
By running the belt 17, the formwork 11 or 21 is rotated to centrifugally form the concrete pipe or concrete pile, and then the formwork 11 or 21 is pulled out or the formed concrete pipe or concrete pile is formed by centrifugal force. 1. A method for producing a concrete pipe or concrete pile, comprising extruding the concrete pile and then demolding the concrete pipe or concrete pile.