JPH0829544B2 - Internal pipe finishing method and equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method and an apparatus for finishing an inner surface of a concrete pipe, and more specifically, in a concrete pipe manufacturing process, a continuous structure with a simple structure. The present invention relates to a method and an apparatus for finishing the inner surface of a concrete pipe, which is capable of smoothing the inner surface of the concrete pipe.

[Conventional technology]

Conventionally, concrete pipes (fume pipes) such as RC pipes and PC pipes
Is usually used for formwork assembly, concrete pouring (placement),
It is manufactured through centrifugal compaction, steam curing, demolding, and wet curing.

By the way, in the case of the above-mentioned manufacturing method, the inner surface of the concrete pipe is in an unfinished state, in other words, in a roughly finished state. Therefore, conventionally, the inner surface is finished by the following means.

After centrifugal compaction molding of concrete, a method of inserting an inner surface finishing tool having a trowel at the tip of a long handle from both tube ends of the molded concrete tube and smoothing the inner surface manually.

After curing, a resin coating is applied to the inner surface of the concrete pipe to even out the inner surface.

By taking this measure, it is possible to prevent scales or the like from easily adhering to the inner surface of the concrete pipe when it is installed as a sewer pipe or the like.

[Problems to be Solved by the Invention]

However, the above-mentioned means has the following problems. That is, in the former case, since it takes manual work, it takes too much working time, and a difference occurs in the inner finished state between the expert and the normal worker.

In the latter case, a uniform inner smooth surface can be obtained, but the cost is too high.

Since continuous work cannot be performed, there is a limit to the reduction of concrete pipe manufacturing time.

There is a problem such as.

The present invention has been made in consideration of the above-mentioned points, and its object is to continuously smooth the inner surface of a concrete pipe with a simple structure in a concrete pipe manufacturing process. An object of the present invention is to provide a method and an apparatus for finishing the inner surface of a concrete pipe, which can make the inner diameter uniform.

[Means for solving the problem]

Then, the inner surface finishing method of the concrete pipe according to claim 1 of the present invention as a means for achieving the above-mentioned object is to inject the kneaded concrete into a mold and to apply a rotational force to the mold, When manufacturing concrete pipes by centrifugal compaction and mold release of concrete, at the time of centrifugal compaction molding or after molding, insert an inner surface finishing roller into the mold and rotate the mold. In this state, the inner surface finishing roller is not rotated, or is vertically moved, or is moved in the longitudinal direction of the mold while being rotated in the direction opposite to the rotating direction of the mold, and the uncured or semi-cured concrete pipe An inner surface finishing method for a concrete pipe to be subjected to inner surface finishing, as the inner surface finishing roller,
A roller provided with a concrete passage in the roller longitudinal direction inside the roller and having a plurality of small holes, long holes or the like communicating the concrete passage and the outer peripheral surface of the roller on the peripheral surface of the roller. The concrete for repairing the inner surface of the uncured or semi-cured concrete pipe is supplied via the.

The inner surface finishing method for a concrete pipe according to claim 2 is to inject the kneaded concrete into a formwork, apply a rotational force to the formwork, centrifugally compact and mold the concrete, and demold the concrete pipe. At the time of manufacturing, during or after the centrifugal compaction molding, the inner surface finishing roller is inserted into the above-mentioned mold and the inner surface finishing roller is not rotated or moved up and down while the mold is rotated. In the inner surface finishing method of a concrete pipe, the inner surface of an uncured or semi-hardened concrete pipe is finished by moving the mold in the longitudinal direction of the mold while rotating it in the opposite direction to the rotating direction of the mold. As the inner surface finishing roller, a concrete passage is provided inside the roller in a longitudinal direction of the roller, and the concrete passage and the outer circumferential surface of the roller are connected to the peripheral surface of the roller. Number of small holes, a roller having holes and long holes, and configured to remove excess concrete on the inner surface of the uncured or semi-cured state concrete pipes through the concrete path from the hole.

The inner surface finishing device for a concrete pipe according to claim 3 is a mold for injecting kneaded concrete to form a concrete pipe, rotating the mold, and centrifugally compacting the injected concrete. A drive unit for
An inner surface finishing roller that is inserted into the mold to finish the inner surface, and a roller driving unit that rotates or vertically moves the inner surface finishing roller, and the inner surface finishing roller is a roller longitudinal direction inside the roller. The roller is provided with a concrete passage, and has a plurality of holes such as small holes and elongated holes which connect the concrete passage and the outer peripheral surface of the roller on the peripheral surface of the roller.

[Action]

In the case of the inner surface finishing method and apparatus for a concrete pipe of the present invention, the inner surface of the concrete pipe compacted by centrifugal force in the mold is polished in a state in which the mold is rotated before demolding. -Since it is finished, the inner surface finishing work can be continuously and integrally incorporated during the manufacturing process of the concrete pipe, and the manufacturing process period can be shortened. Since the inner surface of the concrete is rolled and ground by the roller for finishing the inner surface, the inner surface of the concrete pipe can be corrected with a uniform force.

Then, the inner surface finishing roller is provided with a concrete passage in the roller longitudinal direction inside the roller, and has a plurality of small holes, long holes and the like on the peripheral surface of the roller for communicating the concrete passage and the outer peripheral surface of the roller. Therefore, when the inner surface finishing roller is subjected to inner pressure finishing by rolling or the like, concrete can be supplied or extra concrete can be taken out through a hole or a concrete passage provided in the roller.

〔Example〕

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

Here, FIGS. 1 to 3 show one embodiment of the present invention, FIG. 1 is a manufacturing process diagram of a concrete pipe, FIG. 2 is a schematic perspective view of an apparatus used in this embodiment, and FIG. It is a schematic front view for demonstrating the positional relationship between a frame and an inner surface finishing roller (test bar).

The present embodiment is an embodiment in which the inner surface finishing method of the concrete pipe of the present invention is embodied as a method for manufacturing a concrete pipe (fume pipe), and is roughly summarized as follows: formwork assembly process, concrete pouring process, centrifugal compaction Process,
It consists of seven steps: inner surface finishing process, curing process, demolding process, and curing process. By the way, the apparatus embodying the method of the present embodiment is provided with a centrifugal force forming mold 1 for injecting kneaded concrete to form a concrete pipe, and rotating the mold 1 to remove the injected concrete. A driving unit 2 for centrifugal compaction molding, an inner surface finishing roller 3 for inserting into the mold 1 to finish the inner surface, and a roller driving unit for rotating or vertically moving the inner surface finishing roller 3 (driving shaft). ) 5 is included. And
The inner surface finishing roller 3 is provided with a concrete passage 9 for supplying or removing concrete in the roller longitudinal direction inside the roller as shown in, for example, FIGS. A roller having holes 6, 7, and 8 communicating between 9 and the outer peripheral surface of the roller is used. Although FIGS. 4A to 4C have been described with respect to the configuration of the circular inner surface finishing roller, the present invention is not limited to this shape. Each step will be described below.

-Formwork assembly process-This process involves the thickness of the concrete pipe to be manufactured,
This is the process of selecting and assembling the formwork corresponding to the pipe diameter and pipe length.

Since the mold is used repeatedly, the mold is usually cleaned and then applied with a mold release agent, and then assembled and assembled. Here, as for the mold, as shown in FIG.
Set it so that it can be placed on top of 2 to apply a rotational force.

-Concrete pouring (placing) step-This step is a step of pouring the kneaded concrete into the formwork assembled in the formwork assembling process.

Here, the concrete is a form of coarse aggregate 25 to 10 mm, a unit cement amount of 370 to 540 kg, and a water cement ratio of about 50 to 37% kneaded by a forced kneading mixer.
Inject (pour) from the concrete inlet at the end of the.

As the concrete, if necessary, early-strength Portland cement is used, and an admixture such as blast furnace slag fine powder is added.

-Centrifugal compaction step-This step is a step of centrifugally compacting the concrete poured into the mold in the concrete pouring (placing) step to form an uncured or semi-cured concrete pipe.

In the centrifuge (pipe making machine) shown in FIG. 2, by rotating the wheels 2a, 2a, the mold 1 placed on the wheels 2a, 2a constituting the drive unit 2 is rotated to form the mold 1. A centrifugal force is applied to the concrete in the frame 1 to form a hollow cylindrical concrete pipe in the form 1.

As the centrifugal compaction device, a gyro type in which a form frame is hung and rotated around a central axis so as to rotate a top may be used.

-Inner Surface Finishing Step-This step is a step of making the inner surface of the uncured or semi-hardened concrete pipe formed in the centrifugal compaction step a smooth and dense surface.

And, specifically, in FIG. 2, the end surface of the mold 1
From 1a, the inner surface finishing roller (test bar) 3 is inserted to obtain the state shown in FIG. That is, the inner surface finishing roller 3 is inserted and arranged so as to come into contact with the inner surface 4a of the concrete pipe 4. Then, in a state in which the mold 1 is rotated, a rotational force is applied to the inner surface finishing roller 3 in a direction opposite to that of the mold 1 (in other words, the inner surface finishing roller 3 is oriented in a direction opposite to that of the mold 1). While rotating it to
The inner surface finishing is performed by moving the inner surface finishing roller 3 in the longitudinal direction of the mold 1 to polish the inner surface 4a of the concrete pipe 4. Here, the inner surface finishing roller 3 is a roller having an elliptical cross section,
It is attached to a drive shaft that constitutes a roller drive unit 5 for transmitting a rotational force, and can rotate along the inner surface 4a of the concrete pipe 4. Here, the elliptical roller is used to change the force applied to the inner surface 4a of the concrete pipe 4 by the rotation of the roller so as to further smooth the inner surface and make it uniform. Further, the inner surface finishing roller 3 can be moved up and down together with the rotation. Note that, here, the insertion of the inner surface finishing roller 3 into the mold 1 may be performed in parallel with the centrifugal compaction step or after the completion of the step. Is. By the way, even if the inner surface finishing roller 3 is fixed, the inner surface can be made uniform by the mold 1 and the inner surface finishing roller 3, and the inner surface finishing roller 3 is shown in FIG. like,
Since a concrete passage 9 for supplying or removing concrete in the longitudinal direction of the roller is provided inside the roller, and holes 6, 7, 8 for communicating the concrete passage 9 and the outer peripheral surface of the roller are provided, the inner surface finishing roller is rolled. When the inner surface is finished by such means, it is possible to supply concrete and take out excess concrete through the holes provided in the roller and the concrete passage, so that the inner surface can be uniformly finished.

-Curing Step-This step is a step of curing the centrifugally compacted concrete tube and finishing the inner surface of the concrete tube so as to give a certain strength, so that the mold can be removed in the next step.

Here, the curing is usually steam curing at 1000 ° C./h. Specifically, as in the conventional method, the mold is put in the curing chamber as it is, and after a predetermined isothermal curing period has elapsed, it is gradually cooled and taken out when there is no significant difference from the outside temperature.
As the curing, autoclave curing, electric curing, infrared curing, and high frequency curing can also be performed, if necessary.

-Demolding process-This process is a curing process that promotes hardening of concrete,
After making it a strength that does not hinder the handling of concrete pipes,
This is the process of removing the formwork and obtaining a concrete pipe.

Then, the demolded formwork is repeatedly used to manufacture the next concrete pipe.

-Curing step-This step is a step for preventing the molded and hardened concrete pipe from sufficiently exhibiting strength due to the hydration reaction of cement so that cracks and the like do not occur.

As the curing here, wet curing is used as in the conventional method.

The inner surface of the concrete pipe manufactured through the above steps is continuously finished in the concrete pipe manufacturing process. Therefore, it is not necessary to separately perform the inner surface finishing work.

Next, in order to confirm the effect of the method for producing a concrete pipe according to the present embodiment, under the same conditions, a method for producing a concrete pipe using a conventional manual inner surface finishing work and the method according to the present embodiment are performed. The obtained concrete pipes were attached to 25 pipes each, and when the tolerance of the inner surface of the concrete pipes was examined,
In the case of the method of this embodiment, all are within the allowable range ±
While it was within the range of 2 mm, it was confirmed that 10 pieces were out of the allowable range by the conventional method.
Further, in the case of the method of the present example, the entire inner diameter was substantially uniform, whereas in the case of the method of the conventional example, the presence of irregularities could be confirmed even within the allowable range. In the case of the conventional example, this is considered to be variation due to the operator.

From this, it was confirmed that when the method of this example was used, the inner surface of the concrete pipe could be continuously smoothed with a simple structure in the manufacturing process of the concrete pipe.

It should be noted that the present invention is not limited to the above-described embodiments, but includes modifications that can be implemented without departing from the scope of the present invention. As the inner surface finishing roller, a plurality of rollers may be inserted / arranged inside the concrete pipe, and each may be configured to be given a rotational force, and the roller may be a spring or the like if necessary. The pressing force on the inner surface of the concrete pipe is adjusted.

By the way, the inner surface finishing roller 3 is shown in FIG.
As shown in (c), the inside of the roller is provided with a concrete passage 9 for supplying or removing concrete in the roller longitudinal direction, and holes 6, 7 and 8 are formed to connect the concrete passage 9 and the outer peripheral surface of the roller. That is,
In FIG. 4 (a), the hole 6 is composed of a plurality of small holes 6, and concrete for replenishment and correction can be supplied from the small holes 6. In FIG. 4 (b), the hole 7 is configured as a concrete supply long groove 7 along the roller longitudinal direction. Further, FIG. 4 (c) shows a plurality of holes 8 such as small holes and long holes.
Therefore, the extra concrete on the inner surface of the semi-hardened or semi-hardened concrete pipe can be removed from the end of the frame by vacuum or the like.

In addition to the case where the inner surface finishing roller 3 rotates in the concrete pipe as shown by an arrow a in FIG. 3 to roll the inner surface of the concrete, as shown in an arrow b in the concrete pipe in FIG. By rotating the inner surface finishing roller 3 up and down and causing the elliptical roller 3 shown in FIG. 3 to rotate, the state of applying pressure to the inner surface of the concrete pipe and the state of not applying pressure may be repeated. .

〔The invention's effect〕

As is clear from the above description, according to the inner surface finishing method and apparatus for a concrete pipe of the present invention, the inner surface finishing roller is provided with a concrete passage in the roller longitudinal direction inside the roller, and the concrete passage is provided on the circumferential surface of the roller. Since a roller having a plurality of small holes, holes, etc. communicating between the roller and the outer peripheral surface of the roller is used, when the inner surface finishing roller is subjected to inner pressure finishing by rolling, the hole provided in the roller, the concrete passage Through this, it is possible to supply concrete and take out excess concrete, and it is possible to achieve a uniform inner surface finish.

Therefore, according to the present invention, it is possible to provide a concrete pipe inner surface finishing method capable of continuously smoothing the inner surface of the concrete pipe with a simple structure in the manufacturing process of the concrete pipe.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 4 show an embodiment of the present invention, FIG. 1 is a manufacturing process diagram of a concrete pipe, and FIG. 2 is a schematic perspective view of an apparatus used in this embodiment. FIG. 3 is a schematic front view for explaining the positional relationship between the mold and the inner surface finishing roller, and FIG. 4 (a).
(C) is a perspective view for explaining an inner surface finishing roller. 1 ... Formwork, 1a ... End of formwork, 2 ... Drive unit, 2a ...
Wheels, 3 ... Inner surface finishing rollers (test bar), 4
…… Concrete pipe, 4a …… Inner surface of concrete pipe, 5
...... Roller drive unit, 6 ... Small hole, 7 ... Concrete supply long groove, 8 ... Concrete suction (removal) hole,
9: Concrete passage

Claims (3)

[Claims] 1. When a concrete pipe is manufactured by injecting kneaded concrete into a mold and imparting a rotational force to the mold to compact and mold the concrete by centrifugal force and to remove the mold, the centrifugal force is applied. At the time of compaction molding, or after molding, insert the roller for finishing the inner surface into the mold, and in a state where the mold is rotated, the roller for finishing the inner surface is not rotated, or is vertically moved,
Alternatively, it is a method for finishing the inner surface of a concrete pipe, wherein the inner surface of the concrete pipe in an uncured or semi-cured state is finished by moving in the longitudinal direction of the mold while rotating it in the direction opposite to the rotating direction of the mold. As the inner surface finishing roller, a roller provided with a concrete passage in the roller longitudinal direction inside the roller, and having a plurality of small holes, holes, etc., which connect the concrete passage and the outer peripheral surface of the roller to the peripheral surface of the roller. A method for finishing the inner surface of a concrete pipe, wherein the concrete for repairing the inner surface of the uncured or semi-hardened concrete pipe is supplied from the concrete passage through the hole. 2. When a concrete pipe is manufactured by injecting a kneaded concrete into a mold and imparting a rotating force to the mold to compact and mold the concrete by centrifugal force and remove the mold, the centrifugal force is applied. At the time of compaction molding, or after molding, insert the roller for finishing the inner surface into the mold, and in a state where the mold is rotated, the roller for finishing the inner surface is not rotated, or is vertically moved,
Alternatively, it is a method for finishing the inner surface of a concrete pipe, wherein the inner surface of the concrete pipe in an uncured or semi-cured state is finished by moving in the longitudinal direction of the mold while rotating it in the direction opposite to the rotating direction of the mold. As the inner surface finishing roller, a roller provided with a concrete passage in the roller longitudinal direction inside the roller, and having a plurality of small holes, holes, etc., which connect the concrete passage and the outer peripheral surface of the roller to the peripheral surface of the roller. A method for finishing the inner surface of a concrete pipe, characterized in that excess concrete on the inner surface of the uncured or semi-hardened concrete pipe is removed from the hole through the concrete passage. 3. A mold for injecting kneaded concrete to form a concrete pipe, a drive unit for rotating the mold to centrifugally compact the injected concrete, and the mold. It has a roller for inner surface finishing for inserting into the frame to finish the inner surface, and a roller driving unit for rotating or moving the inner surface finishing roller up and down, and the inner surface finishing roller is concrete in the roller longitudinal direction inside the roller. A plurality of small holes provided with a passage and connecting the concrete passage and the roller outer peripheral surface to the roller peripheral surface;
An inner surface finishing device for a concrete pipe, which is a roller having holes such as long holes.