JPH01275008A - Manufacture of concrete pile and device thereof - Google Patents

Abstract

PURPOSE:To obtain a dense and strong concrete pile by a method wherein concrete is compacted by pressing force which is applied in the radial direction along the axis of a concrete form due to centrifugal force, and by micro- vibration from a vibrating means. CONSTITUTION:Transmission rings provided on the outer periphery of a concrete form, in which an iron reinforcing bar cage is set and, after that, ready-mixed concrete is filled, are seated on driving rollers and driven rollers 9. In addition, vibrating rollers 15 are pressed against swung rings 16. By rotating a driving shaft with a driving motor under the state just mentioned above, the driving rollers 8 are rotated, resulting in rotating the concrete form 1. In combination with the driving of the driving motor, micro-vibration generated with a vibrator 14 is transmitted through vibratingly rotating rollers 15 to the concrete form 1 so as to micro-vibrate the concrete form 1, which is rotated at high speed. The micro-vibration of the concrete form together with its high speed rotation gives compacting forces due to high speed rotation and vibration to the concrete in the concrete form 1, resulting in producing a dense and strong concrete pile.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a concrete pile manufacturing method and its vc arrangement for manufacturing concrete piles by centrifugal forming.

[Prior art 1 Generally, when manufacturing cylindrical concrete piles,
The two formwork bodies, which are divided into upper and lower semicircles, are fastened together at the 7-run section to assemble the formwork, a reinforcing bar cage serving as a core material is placed inside the formwork, and fresh concrete is filled, and then the mold is sealed. The usual method is to perform centrifugal molding by subjecting the frame to high-speed rotation.

[Problem to be solved by the invention 1 However, with centrifugal molding! Regarding the quality of a concrete pile product, it is important not only that it has a good appearance and external shape, but also that the concrete is of high strength. In order to obtain a concrete pile with high strength, it is necessary that the concrete be V-sized and compacted uniformly. In order to achieve thorough compaction, the formwork should be rotated at high speed during centrifugal molding to provide a large compaction force.
The higher the rotation speed, the more the concrete materials will separate (separation occurs because the specific gravity of materials such as cement, sand, and gravel differs), making it impossible to obtain homogeneous and strong concrete, and the longer the formwork becomes. Therefore, the higher the speed, the greater vibration occurs between the rollers of the centrifugal device that rotates the formwork and the formwork (caused by problems in the manufacturing and installation accuracy of the formwork and rollers), which results in less uniformity. There were problems in that it was not possible to construct 91 high-strength concrete piles, and that the formwork and centrifugal forming equipment were damaged.

In addition, in order to obtain a concrete pile with high strength, it is recommended to manufacture it with a rich mix of ready-mixed concrete, but it is not economical if a large amount of cement is used, and even with the same amount of cement, it has a low slump (relative to the amount of cement used). It is best to manufacture concrete using concrete that requires a small amount of water to knead (the strength of the concrete is higher compared to concrete that uses a large amount of water), but if the amount of water used is small, the concrete becomes dry and cannot be compacted using normal centrifugal forming alone. .

The present invention was invented in view of the above-mentioned conventional problems, and its purpose is to produce a concrete pile manufacturing method that can produce a concrete pile that is densely compacted and strong when formed by centrifugal forming. and its location.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the method for manufacturing a concrete pile of the present invention centrifugally forms a formwork 1 with a reinforcing bar cage 20 inside and filled with fresh concrete. In this case, slight vibrations are applied to the formwork 1.

Further, the concrete pile manufacturing apparatus of the present invention has a formwork 1
The structure includes a mold rotor p'i2 for rotating the mold frame 1, and a vibration applying means 3 for applying micro vibrations to the mold frame 1.

[Effect 1] Therefore, in the present invention, slight vibration is applied to the formwork 1 during centrifugal forming of a concrete pile, and a dense and strong concrete pile is manufactured by compaction by centrifugal force and compaction by slight vibration. It's like that.

[Example 1 Hereinafter, the present invention will be explained in detail by way of examples with reference to the accompanying drawings.

The formwork 1 is constructed by assembling two formwork bodies 4 divided into upper and lower semicircles and fastened together with bolts 6 at seven run parts 5. A fixing plate 7 for locking internal reinforcing bars and the like is provided at the axial end of the formwork 1, and the formwork 1 is sealed. Then, a reinforcing bar cage 20 is arranged inside this formwork 1, and a reinforcing bar cage cap 21,
Shoes and the like are installed, concrete is filled, and centrifugal molding is performed using a centrifugal molding device, which will be described later. 22.2 in Figure 5
3 are tension bolts and tension rods for attaching the reinforcing bar cage 20, and 24 is a formwork tightening iron.

As shown in FIGS. 1, 2, 3, and 4, the centrifugal molding VC apparatus includes a mold rotating means 2 for placing the mold 1 and rotating the mold 1, and a mold 1. and a vibration applying hand Fi3 for applying slight vibrations to the vibration. The formwork rotation means 2 is composed of a driving roller 8 and a driven roller 9 arranged side by side, and a plurality of pairs of the driving roller 8 and driven roller 9 arranged side by side are arranged at predetermined intervals in the axial direction of the formwork 1. It has been done,
A transmission wheel 10 provided on the outer periphery of the formwork 1 is placed on a drive roller 8 and a driven roller 9 as shown in Figure #4, and by rotating the drive roller 8, the formwork 1 is rotated. There is. A drive shaft 12 is fixed to the drive roller 8, and the drive roller 8 is rotated by rotating the drive shaft 12 by the drive motor 11.

As shown in FIGS. 1, 2, and 3, the vibration imparting means 3 includes two vibrating rotary rollers 15, which are rotatably attached to the upper plate 25 of the vibrating table 13, on the outer periphery of the formwork 1. It is configured so that the vibration of a vibrator 14 provided on a vibrating table 13 is applied to the formwork 1 by a vibrating rotary roller 15 which is pressed against a vibratory ring 16 and is rotated. The vibration table 13 is upper g12
5 and a lower plate 17 are connected by a spring body 18, and a vibrating rotating roller 15 is rotatably attached to the upper plate 25, and the lower plate 17 is fixed to the floor with bolts or the like. be. One or more pie breaks 14 are provided on the back surface of the upper board 25, and in the case of more than one pie break 14, the vibration motors are electrically controlled to rotate synchronously. Here, the pipe rake is not limited to an electric one, and may be an air vibrator or a vibrator operated by hydraulic pressure. The spring body 18 connecting the upper plate 25 and the lower plate 117 is formed so that the end of the fill-shaped spring fits into one circular seat provided on the upper plate 25 and the lower plate 17, and the spring body 18 connects the upper plate 25 and the lower plate 17. The vibrating rotating roller 15 is lightly pressed against the oscillating ring 16 provided on the formwork 1. A plurality of the vibration imparting means 3 are installed in the axial direction of the formwork 1,
Correspondingly, the same number of shaken wheels 16 are also provided on the outer periphery of the formwork 1.

Note that the spring body 18 is not limited to a coil-shaped body (it may also be a leaf spring, an air spring, or a hydraulic spring. Furthermore, when the pie break 14 is activated, the upper plate 25 A guide may be provided to prevent the upper plate 17 and the lower plate 17 from swinging in the horizontal force direction. The end of the guide rod is fixed to one of the other ends, and the guide rod is slidably fitted into the guide pipe to serve as a guide.The guide is provided at a position close to the spring body 18. If the spring body 18 is a coil spring, a guide may be located at the center of the fill spring.Furthermore, since the vibration is minute, a guide may not be provided.

Therefore, in order to manufacture a concrete pile using the above-mentioned apparatus, reinforcing bars 20 are set inside the apparatus, and the formwork 1 filled with fresh concrete is placed on the centrifugal forming apparatus.

In this case, a transmission wheel 10 provided on the outer periphery of the formwork 1 is placed on a drive roller 8 and a driven roller 9, and a vibrating rotary roller 15 is pressed against a vibrating shaft 16 provided on the formwork 1. In this state, by rotating the drive shaft 12 by the drive motor 11, the drive row 28 rotates, giving rotation to the formwork 1.

Here, the rotation speed is gradually increased from low speed to medium speed and then high speed. Then, the pie break 14 is started in accordance with the drive of the drive motor 11.

The minute vibrations of the vibrator 14 are transmitted to the formwork 1 via the vibrating rotation roller 15, and the formwork 1 not only rotates at a high speed but also makes slight vibrations. Here, the vibration of the vibrator 14 is
The vibration of the vibrator 14 can be changed by changing the rotation speed of the vibrator 14 (the vibration force of the vibration imparting means 3,
Low speed, medium speed of centrifugal molding (changing frequency, amplitude, etc.)
Appropriate vibrations may be applied depending on the high speed. In this way, by rotating the formwork 1 at high speed and slightly vibrating it, the concrete inside the formwork 1 is given compaction force due to the high speed rotation and compaction force due to the vibration, resulting in compact and strong concrete. A pile will be formed. When the centrifugal formation is completed in this way,
Concrete piles are produced by steam curing and demolding as usual.

[Effect of the invention 1] In the method for producing a funkley pile of the present invention, when performing centrifugal forming of a formwork with reinforcing bars set inside and filled with ready-mixed concrete, slight vibration is applied to the formwork to form the formwork. In addition, the Funkley pile manufacturing apparatus of the present invention includes a formwork rotation means for rotating the formwork;
Since the vibration applying means is used to apply slight vibrations to the formwork, the concrete is compacted by the pressing force in the radial direction of the formwork axis due to centrifugal force and the fine vibrations from the vibration applying means, making it dense and strong. In addition, since a vibration (=1) imparting means for imparting microvibrations is used in combination, the rotation speed required for centrifugal molding is not as high as in centrifugal molding, and the time for centrifugal molding can also be shortened. .

[Brief explanation of the drawing]

FIG. Side view for explaining, Fig. 5(a)(b)(c)(d)
1 is a plan view, a right side view, a left side view, and a partially omitted plan view of the formwork used in the above with reinforcing bars included, in which 1 is the formwork, 2 is the formwork rotation means, and 3 is the vibration imparting means. Means 20 is a reinforcing bar capacity. Agent Patent Attorney Ishi 1) Ai Figure 7 Figure 3 Figure 4

Claims (2)

[Claims] (1) A method for manufacturing a concrete pile, characterized by applying slight vibrations to the formwork during centrifugal forming of the formwork with a reinforcing bar cage set inside and filled with fresh concrete. (2) A concrete pile manufacturing apparatus comprising a formwork rotating means for rotating the formwork and a vibration imparting means for imparting micro vibrations to the formwork.