JP3015151B2 - Method of manufacturing concrete pipe - 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 concrete pipe, and more particularly to a method of manufacturing a concrete pipe by centrifugal force molding.

[0002]

2. Description of the Related Art Conventionally, the production of concrete pipes by centrifugal force molding has been accomplished by using a molding machine schematically shown in FIG.

[0003] In the drawing, reference numeral 101 denotes a molding machine main body;
Are runner foils provided at four places before and after the molding machine main body 101. This runner wheel 102 is an electric motor 1
03 are configured to rotate in the same direction, for example, counterclockwise.

[0004] On the other hand, reference numeral 104 denotes a mold.
Casting 105, 105 is provided on both sides of
The lower portions of the castings 105, 105 are supported by the runner foil 102 on the molding machine side, and
In this configuration, the mold 104 is rotated by frictional conduction between the mold 104 and the runner foil 102.

[0005]

However, only the centrifugal force caused by the rotation of the formwork 104 described above limits the hardness of the concrete raw material that can be put into the mold and molded. Was needed.
Therefore, slurry was also generated at the time of molding, and the treatment was required.

In order to shorten the molding time or to enable the use of hardened concrete material, it is conceivable to increase the rotation speed of the mold 104.
No. 04 has only its lower part supported by the runner foil 102, and the mold 104 may fly out of the molding machine due to the effect of the increased centrifugal force, and there is also a problem in terms of safety.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a method of manufacturing a concrete pipe which can use zero-slump super-hard concrete and is excellent in safety. It is in.

According to the present invention, in order to solve the above-mentioned problems, a large number of castings are attached to the outer periphery of a mold at appropriate intervals.
In a method of manufacturing a concrete pipe by centrifugal force molding in which the lower part of the casting is supported by a runner foil and the casting and the runner foil rotating rotate the formwork by frictional transmission, a 0.05-0.2
applying a centrifugal force of 3 to 4 G to a mold giving an amplitude of mm.
Pour zero-slump ultra-hard concrete into the formwork
Centrifugal force applied to the super-hardened concrete in the formwork
The force is set to 10-12G, and the combined use of centrifugal force and vibration
The above concrete was molded.

[0009]

According to the method of manufacturing a concrete pipe according to the present invention, vibration is applied in addition to centrifugal force due to the rotation of the mold, so that the molding time can be shortened. Since it is used, no slurry is generated and the treatment is not required.

Further, since the vibration is applied from above the form by the vibrator, the form is sandwiched between the runner foil and the vibrator, so that there is no fear that the form will jump out of the molding machine.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a side view showing an apparatus for carrying out a method for manufacturing a concrete pipe according to the present invention.
FIG. 2 is a front view of the same device.

In the figure, reference numeral 1 denotes a molding machine, and 2 denotes a runner wheel rotatably mounted on the molding machine 1. The runner foil 2
The left and right are provided in two pairs, and are configured to rotate in the same direction, for example, counterclockwise by an electric motor (not shown).

Reference numeral 3 denotes a vibrator. The vibrator 3 comprises a vibrator 4 and a roller 5 for transmitting the vibration of the vibrator. The vibrator 3 can move above the molding machine 1 by the rotation of the arm 6. .

Reference numeral 7 denotes a mold. Castings 8, 8 are provided on both sides of the mold 7, and the castings 8, 8 are provided.
8 is supported by the pair of left and right runner wheels 2 and 2 and the arm 6 is rotated above the castings 8 so that the rollers 5 and 5 of the vibrator 3 come into contact with each other. It is configured.

Reference numeral 9 denotes a concrete charging machine with a measuring device, and the charging machine 9 is provided in the formwork 7 so as to be movable forward and backward. A rolling roller 10 is provided in the mold 7 so as to be movable forward and backward. The rolling roller 10 is pressed while rotating the rolling roller 10 against the inner wall surface of the concrete pipe after centrifugal molding. Be smooth.

In manufacturing a concrete pipe using the molding machine constructed as described above, first, the form 7 is placed on the runner foils 2, 2 of the molding machine 1 in a state where the castings 8, 8 are supported below. The mold 7 is provided with low speed rotation (to the extent that a centrifugal force of 3 to 4 G is generated) by being mounted and rotating the runner foils 2 and 2.

Next, the arm 6 is rotated so that the rollers 5, 5 of the vibrator 3 are brought into contact with the upper portions of the castings 8, 8 of the mold 7, and the mold 7 is vibrated (amplitude: 0.05-0. 2m
m, frequency 3000-5000r. p. m).

In this state, a zero slump super-hard concrete (for example, cement: fine aggregate: coarse aggregate: water = 1: 2.
6: 1.8: 0.3).

Then, the rotation of the runner foils 2 and 2 is increased in a state where the vibration is applied to increase the centrifugal force (approximately 10 to 12 G) applied to the concrete raw material in the mold 7, and the rolling roller 10 is moved to the mold. 7 and pressed against the inner wall surface side of the concrete pipe while rotating in the same direction as the formwork 7 (peripheral speed: about 400 to 450 m / min).

The concrete tube molded by the above operation is subjected to steam curing in the same manner as a general centrifugal force molded tube.

According to the method for manufacturing a concrete pipe according to the present invention described above, a concrete pipe having no slurry and having the same strength as the conventional one can be produced for a short time (conventionally,
Although it took about 10 minutes to mold a B-type 600φ × 2.43 m pipe, the manufacturing method according to the above embodiment shows that
Minutes).

It should be noted that the present invention is not limited to the above-described embodiment, and it is obvious that various modifications and changes can be made based on the technical idea of the present invention.

[0024]

According to the method of manufacturing a concrete pipe according to the present invention, the vibration of the concrete pipe is 0.05 to 0.2 m from above.
centrifugal force is applied to the mold giving the amplitude of m
Zero slump ultra-hard concrete was put into the formwork
Later, the centrifugal force applied to the super-hardened concrete in the formwork
To 10 to 12 G, and combined with centrifugal force and vibration
I decided to mold the concrete, so I needed
Time can be reduced from about 10 minutes to 4 minutes.
Since the production time can be greatly reduced than before , and because zero slump ultra-hard concrete is used as a raw material,
No slurry is generated and the treatment is not required.

Further, since the vibration is applied from above the form by the vibrator, the form is sandwiched between the runner foil and the vibrator, so that there is no fear that the form will jump out of the molding machine, thereby improving safety.

[Brief description of the drawings]

FIG. 1 is a side view showing an apparatus for carrying out a method for manufacturing a concrete pipe according to the present invention.

FIG. 2 is a front view showing an apparatus for carrying out the concrete pipe manufacturing method according to the present invention.

FIG. 3 is a perspective view showing an apparatus used for manufacturing a conventional concrete pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molding machine 2 Runner foil 3 Vibrator 4 Vibrator 5 Roller 6 Arm 7 Formwork 8 Casting 9 Concrete input machine 10 Rolling roller

Claims (1)

(57) [Claims] 1. A concrete pipe by centrifugal force molding, in which a large number of castings are attached to the outer periphery of a mold at appropriate intervals, a lower portion of the casting is supported by a runner foil, and the casting and the rotating runner foil are rotated by a frictional conduction. in the method of production, the vibration machine from above
Centrifuge on a formwork giving an amplitude of 0.05-0.2mm
Give 3 to 4 G of force and apply a zero-slump super-hard
After the concrete has been charged,
A method for manufacturing a concrete pipe, wherein a centrifugal force applied to a REIT is set to 10 to 12 G, and the concrete is molded by a combination of a centrifugal force and vibration.