JP2999602B2 - Two-stage ultra-high-speed centrifugal column method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-stage ultrahigh-speed centrifugal force column manufacturing method.

[0002]

2. Description of the Related Art In general, secondary concrete products such as concrete piles, poles and fume tubes are formed by centrifugal force by rotating a column-forming form at a high speed and applying a specific centrifugal force to concrete in the column-forming form. ing. As a specific method of centrifugal force forming method, there is an iron tire type centrifugal force column making machine that puts a cylindrical form on a rotating tire and rotates it, and puts it on a belt running on a cylindrical form. There is a belt type centrifugal force column making machine that rotates.

[0003]

In the former method, high frequency vibration is generated since iron and iron rotate by directly hitting each other.
Although it is easy to arrange the concrete material in a uniform state without separation, the centrifugal force given to the concrete is at most about 35 G due to this vibration, and a long column making time is required.
Also, when the abrasion of the formwork tire portion increases, the generated vibration increases, and a large amount of bits (nests) and irregularities of the hollow inner surface are easily generated inside the concrete, and the quality is inferior. On the other hand, the latter method can apply a high-speed centrifugal force of 60 G or more to concrete, and can produce a column in a shorter time than the former method. It takes time to arrange in a proper state. Accordingly, an object of the present invention is to provide a two-stage ultrahigh-speed centrifugal column forming method capable of forming columns in a shorter time than the belt-type centrifugal column forming technology and capable of disposing concrete materials in a uniform state without separation. Is what you do.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides the following two-stage ultrahigh-speed centrifugal column manufacturing method. That is, the formwork is rotated with the iron tire of the iron-type centrifugal force column making machine, and the centrifugal force compacts the concrete material before curing so that the uncured concrete material is arranged in a uniform state without being separated in the formwork. After molding,
The formwork is lifted by the belt of the belt-type centrifugal force column making machine, the formwork is separated from the iron tire, the formwork is rotated by the belt, and the final compaction is performed by the super high speed centrifugal force of 60G or more. This is a two-stage ultra-high-speed centrifugal force column forming method.

[0005]

First, a centrifugal force is applied to the form by an iron tire of an iron tire type centrifugal force column making machine, and then centrifugal force is applied to the form by a belt of a belt type centrifugal force forming machine to form a column.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Centrifugal compaction is usually performed in three stages: low speed, medium speed, and high speed. First, the uncured concrete in the form is spread evenly over the entire length by low speed rotation. The rotation speed is gradually increased, and a large centrifugal force is applied to the high-speed rotation to sufficiently compact the concrete. In an iron tire type centrifugal force column making machine, the formwork is first rotated at a low speed at which a centrifugal force of about 3G acts, and then the mold is rotated at a medium speed at which a centrifugal force of about 12G acts, and then at 30G. The column is made by rotating the formwork at a high speed where a slight centrifugal force acts.
On the other hand, in a belt-type centrifugal force column making machine, first, the mold is rotated at a low speed rotation at which a centrifugal force of about 3G acts, and then the 12
The mold is rotated at a medium speed rotation at which a moderate centrifugal force acts, and then the mold is rotated at a high speed rotation at which a centrifugal force of 60 to 80 G acts to form a pillar. The above numerical values are average values.

As a general property of the centrifugal compaction method, it is considered that minute vibration during rotation is effective for centrifugal compaction. Since the vibration of the frequency is generated, it is easy to arrange the concrete material uniformly. On the other hand, as a general property of the centrifugal compaction method, if the rotation speed is increased, there is a centrifugal compaction effect, but material separation tends to be remarkable. The time from low speed to medium speed required for uniform arrangement needs to be longer than that of the iron-type centrifugal column machine.

[0008] Accordingly, the present invention provides a concrete utilizing the advantages of an iron tire type centrifugal column machine in order to form a column in a shorter time than a conventional belt type centrifugal column machine. It is intended to shorten the time required for uniformly disposing the materials and to obtain a high quality concrete product by utilizing the advantages of the compaction of the centrifugal force of the belt-type centrifugal force column machine as it is.

FIGS. 7 and 8 show an iron tire type centrifugal column machine.
As shown in the figure, an iron tire (3) provided on a cylindrical formwork (4) is placed between the iron wheels (1) and (2), and the iron wheels (1) and (2) are rotated to change the iron and iron. The formwork (4) is rotated by the frictional transmission of the concrete, and the concrete inside the cylindrical formwork (4) is centrifugally formed. As shown in FIGS. 9 and 10, the belt-type centrifugal column machine hangs an endless belt (8) on outer frames of two main pulleys (5) and (6) and a sub pulley (7). A tire (1) provided in a cylindrical form (9) on a belt (8) between pulleys (5) and (6).
No. 0) is placed thereon, and the belt (8) is run to rotate the formwork (9) to form the concrete inside the cylindrical formwork (9) with ultra-high speed centrifugal force.

In the present invention, a formwork in which the respective tires in the above-described column making machine are combined is used, and has a wide tire (12) and a narrow tire (11) as shown in FIG. A mold (13) is used. Narrow iron tires (11)
Is 60 to 100 mm, and the width of the wide belt tire (12) is the belt width + 50 to 150 mm. As shown in FIG. 5, the formwork (13) as described above first places a narrow tire (11) on iron wheels (14) and (15) of an iron-tire centrifugal column machine, and a motor ( M), the mold (13) is rotated, excess water is squeezed out, compaction molding is performed in which the material is uniformly arranged, and then, as shown in FIG. A wide tire (12) is placed on the belt (16), the mold (13) is rotated by driving the belt (16), and compaction is performed by ultra-high speed centrifugal force of 60 G or more to form a pillar. The wide tire (12) of the mold (13) is disclosed in Japanese Patent Application Laid-Open No. 62-1160.
When a drum-shaped one as shown in JP-A-9 is used, the belt and the formwork do not meander.

[0011] The above method is to increase the centrifugal force to 3G, 12G and 30G in an iron tire type centrifugal column machine to form a centrifugal force, and then centrifugal force in a belt type centrifugal column machine. At a stretch to 60 G or more and centrifugal molding. Also, the switching between the iron-type centrifugal force column making machine and the belt type centrifugal force column making machine may be performed by using a crane, but in order to automatically switch, as shown in FIG. 1, FIG. 2, FIG. Use an appropriate device. As shown, the iron wheels (14) and (15) of the iron-type centrifugal column machine are suspended on the base (22) of the device, and the belt (23), the intermediate shaft (24), It is driven via a belt (25) and a main shaft (26). The belt (16) of the belt-type centrifugal column machine is stretched between the main pulleys (17) and (18) and the sub pulley (19), and the main pulley (18) and the sub pulley (19) are connected to the base ( The main pulley (17) is mounted on an elevator (20). The main pulley (17) is driven by a motor (M ₁ ) installed on a lift (20) via a belt (27) and a main shaft (28).

The lifting platform (20) can be raised to the surface of the base (22) as shown in FIG. 3 by, for example, a pantograph-type lifting device (21). When it reaches the surface of the base (22), the main pulley ( 17) The belt (16) is rotated by the main pulley (18) and the sub-pulley (19), and the tire (12) of the form (13) is driven by the belt (16). When the column is finished, the lifting platform (20) will be on the base (22).
Is stored in the storage space (29). During storage, the main pulley (17) also descends, so that the belt (16) changes to the state shown in FIG. Further, when pillars are formed by the belt (16) as shown in FIG. 3, the form (13) moves the belt (1) until the tire (11) does not touch the iron wheels (14) and (15).
6). Therefore, there is no need to move the formwork (13) from that position in order to switch from the iron tire type centrifugal force column making machine to the belt type centrifugal force column making machine, and the time can be further reduced. The switching device between the iron-tire centrifugal force column and the belt-type centrifugal force column is not limited to the illustrated one, but can be arbitrarily changed in design within the spirit of the present invention.

[0013]

The present invention has the following effects. (1) Initially, the concrete material is uniformly arranged by compaction molding in advance by the iron tire type centrifugal force column making technology, and then the belt type centrifugal force is moved without moving the formwork. Since the final compaction can be performed under ultra high speed centrifugal force of 60G or more by force column technology, centrifugal compaction is effectively performed,
Centrifugal force molding can be performed in a short time. From the above, the column can be formed in a shorter time than the column forming time of the belt-type centrifugal force column forming technology. (2) During rotation of the column formwork, there is no concern that the concrete will shift, so the concrete thickness is uniform and the difference in wall thickness is 2 m.
m or less. (3) The inner peripheral surface of the concrete product is formed with a coating thickness containing calcium carbonate as a main component, and the surface is formed into an extremely flat curved surface with a flatness of 0.1 mm or less, so that the product accuracy and aesthetic appearance are extremely high. high. (4) Since the compaction of concrete can be sufficiently performed, the bit coefficient is extremely small. (5) Since the generation of slag is extremely small, there is no waste of material, and the manufacturing cost can be reduced. (6) By using in combination with the iron tire type centrifugal force column technology, a material having a uniform arrangement can be obtained, and by using the belt type centrifugal force column technology, centrifugal force compaction is sufficiently performed.
The compressive strength of concrete further increases.

[Brief description of the drawings]

FIG. 1 is an explanatory plan view of an apparatus for implementing the method of the present invention.

FIG. 2 is an explanatory view seen from the front of the iron tire type centrifugal force column.

FIG. 3 is an explanatory view as viewed from the front of the belt type centrifugal force column.

FIG. 4 is a plan view of a mold for carrying out the method of the present invention.

FIG. 5 is an illustration of an iron-tire centrifugal column made by the method of the present invention.

FIG. 6 is an explanatory view of a belt type centrifugal force column of the method of the present invention.

FIG. 7 is an explanatory view of a conventional iron tire type centrifugal force column.

FIG. 8 is a side sectional view of the above.

FIG. 9 is an explanatory view of a conventional belt-type centrifugal force column.

FIG. 10 is a side sectional view of the above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Iron tire type centrifugal force column tire 12 Belt type centrifugal force column tire 13 Formwork 14 Iron wheel 15 Iron wheel 16 Belt 17 Main pulley 18 Main pulley 19 Sub pulley 20 Lifting table

Continuation of the front page (56) References JP-A-57-14011 (JP, A) JP-A-62-11609 (JP, A) JP-A-62-11610 (JP, A) JP-A-62-27113 (JP) , A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B28B 1/20 B28B 21/30

Claims (1)

(57) [Claims] 1. A rotating the mold with iron tire iron tire centrifugal force made pillars machine, as concrete material before curing in the centrifugal force is arranged in a uniform state without this separate within the mold Belt-type centrifugal column making machine after compaction molding in advance
Raise the formwork with a belt and separate the formwork from the iron tire.
In addition , a two-stage ultra high-speed centrifugal force forming method, in which a mold is rotated by the belt, and final compaction is performed by ultra-high speed centrifugal force of 60 G or more to form a column.