JPS6138008B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a so-called manufacturing device for centrifugal forming of knotted concrete piles, which are mainly used as friction piles as foundation piles for structures, buildings, etc.

In the production of so-called knotted concrete piles that have knots at required intervals in the longitudinal direction, a half-cylindrical forming form having joint forming portions that bulge outward at required intervals, and a drive shaft are used. Using a rotating centrifugal device in which a driven shaft and a driven shaft are arranged side by side at an appropriate interval and rollers are arranged on each of the shafts, the formwork is mounted on the rollers of the rotating centrifugal device, and The formwork is rotated by the rotation action of a rotating centrifugal device, and centrifugal force is generated in the concrete material filled in the formwork, creating a knotted concrete pile that is integrated with a core material such as a pre-loaded reinforcing bar cage. It is centrifugally molded.

In order to receive the rotational power from the drive shaft, the formwork is provided with driven wheels that come into contact with the rollers on the drive shaft and the driven shaft at required intervals in the longitudinal direction, but the wheels bulge outward. Due to the presence of the joint molded parts, depending on the position of the driven wheel, the distribution of centrifugal force becomes uneven and the balance during rotation tends to collapse, which causes material separation in the pile. Problems arose, such as the body becoming deformed and weak.

Therefore, in an attempt to solve the above-mentioned problems, the applicant proposed that a passive wheel be placed in the center between each joint forming part, taking into account the overall balance of the formwork, and filed a patent application ( (Special Application No. 132825, 1972).

However, in the case of the above-mentioned application, the driven wheel is integral and its position cannot be adjusted in the axial direction.
Therefore, even if the overall balance is slightly unbalanced due to dimensional tolerances of the formwork itself or unevenness of the filled concrete material, it must be used as is, and there is a risk that run-out may occur during centrifugal forming due to high-speed rotation, resulting in poor forming conditions. However, it was still insufficient to solve the above problems.

In view of the above, the present invention provides a ring that is installed on the outer periphery of the main wheel portion as a passive wheel disposed approximately in the center between the joint molded portions, and that the ring is provided so that its position can be adjusted in the axial direction. This allows fine adjustment of the balance of the entire formwork.

Next, embodiments of the present invention will be described based on the drawings. 1a, 1b are joint molded portions 3a, which bulge outward at appropriate intervals in the longitudinal direction of the body portions 2a, 2b;
3b and a semicircular cross section, and the pair of half bodies 1a and 1b constitute a half cylindrical centrifugal form A that can be opened and closed separately. That is, the flanges 4a and 4b have male and female shaped engagement surfaces on the outer side of each joint surface of the half bodies 1a and 1b.
are extended, and are provided so that they can be fastened at appropriate locations with fasteners 5 such as bolts and nuts. By the tightening and tightening operation of this fastener 5, the half-split body 1 is
a, 1b can be joined and divided.

Reference numeral 6 denotes a passive wheel that receives rotational power, and is disposed approximately at the center between the joint molded portions 3a and 3b and at both ends of the formwork. Therefore, the driven wheel 6 has a half-split shape corresponding to the half-split bodies 1a, 1b, and has ring main parts 6a, 6b fixed to the half-split bodies 1a, 1b, and a ring 7 that can be detachably attached to the outer periphery of the main parts 6a, 6b. Consisting of The ring 7 is attached with an engaging means such as a bolt so that it does not come off naturally and does not interfere with frictional transmission. In the embodiment shown in FIG. A slightly wider circumferential groove 8 is provided, a ring 7 is fitted into the circumferential groove 8, and the ring 7 is secured and engaged from both sides of the wheel main parts 6a, 6b with adjusting screws 9 such as bolts. This allows the mounting position of the ring 7 to be finely adjusted in the axial direction within the range of the circumferential groove 8. Further, as in the embodiment shown in FIG. 5, the ring 7 fitted into the circumferential groove 8 of the wheel main parts 6a, 6b is screwed through from one side of the wheel main parts 6a, 6b with an azimuthal screw 9' such as a bolt. held at
It can be provided so that the mounting position of the ring 7 can be finely adjusted in the axial direction by rotating the adjustment screw 9'. Of course, depending on other mounting structures, ring 7
It is possible to implement this by providing a position adjustable in the axial direction.

The above-mentioned ring 7 is usually formed into a half-shape corresponding to the main wheel parts 6a and 6b in order to be detachable, but if it is made of an elastic material, it is formed into a band-shaped ring with one part cut so as to be expandable. You may. In either case, the ring 7 is desirably made of a wear-resistant material suitable for its intended use.

The wheel main parts 6a, 6b may be formed separately and fixed to the half bodies 1a, 1b by welding, or may be integrally formed with the half bodies 1a, 1b by casting.

Ribs 10a and 10b are provided in the longitudinal direction of the half bodies 1a and 1b to maintain balance with the flanges 4a and 4b.

Figures 6 and 7 show the centrifugal molding form A having the above configuration mounted on a rotating centrifugal device, in which M is a drive variable speed motor, L is
and L' are a driving shaft and a driven shaft arranged in parallel with an appropriate interval. Rollers R and R' are attached to the shafts L and L' at required positions, respectively. The rollers R and R' are arranged so as to come into contact with the driven wheels 6 of the formwork A.

To form a knotted concrete pile, first, the halves 1a and 1b are opened and a core material such as a reinforcing bar basket is loaded into the half body 1b of the formwork A, and cement, gravel, sand, etc. , filled with a predetermined amount of concrete material made by mixing water, etc., and then covering the other half 1a and joining and fastening both halves 1a and 1b. Fit the lid (not shown). And formwork A in the above state
are mounted on rollers R and R' of a rotary centrifugal device, and are driven to rotate by a variable speed motor M while gradually increasing the speed. When the roller R on the drive shaft L rotates, the rotation is frictionally transmitted to the driven wheel 6 that comes into contact with the upper part, and the formwork A rotates. The rotation of formwork A generates centrifugal force in the concrete material to be filled inside, compacting the filled concrete and centrifugally forming the knotted concrete pile within formwork A easily and reliably. It is.

Note that steam curing, natural curing, etc. after forming are the same as for ordinary concrete piles, so their explanations will be omitted.

The apparatus of the present invention is used as described above to form or manufacture knotted concrete piles. In the centrifugal forming form A of the apparatus of the present invention, the passive wheels 6 that receive rotational power by friction transmission are arranged at each joint. Since the joint forming parts 3a and 3b bulging outward and the driven wheel 6 are arranged at approximately the center between the joint forming parts, the driven wheels 6 are arranged at equal distances from each other, and the entire formwork is The rotational balance is good, the influence of centrifugal force accompanying rotation is small, and good centrifugal molding can be performed.

In addition, in the present invention, in particular, the driven wheel 6 has a ring 7 attached to the outer periphery of the main wheel parts 6a, 6b, and the ring 7 is provided so that its position can be adjusted in the axial direction. Dimensional tolerances of the formwork itself, deviation of the filling concrete material, etc. can be easily dealt with by finely adjusting the device position of the ring 7 accordingly, and thereby the balance of the entire formwork can be finely adjusted. In combination with the above-mentioned effect of arranging the driven wheel 6 approximately in the center between the joint molded portions 3a and 3b, it is possible to effectively maintain the overall balance. Therefore, according to the device of the present invention, it is possible to prevent vibration during centrifugal forming due to high-speed rotation, and it is possible to reliably fill the concrete material to the ends of the joints, and there is no risk of material separation or weakening of the pile body. do not have.

Furthermore, in the present invention, when the joint molded portion and the driven wheel are formed to have the same outer diameter, the rotational masses of these parts are approximately the same, and vibration prevention is more effective and the molded state of the joint is improved. It gets even better.

Furthermore, in the case of the present invention, even if the circumferential surface of the ring 7 wears out due to friction with the rollers R and R', it is only necessary to replace the ring 7 without replacing the entire driven wheel 6. Work is easy. The ring 7 occupies only a small portion of the entire driven wheel 6, requires less material cost, and is suitable as a replaceable consumable item. Furthermore, since the ring 7 is replaceable and has a small wall thickness, it can be made of not only cast steel but also a sintered alloy, rubber with excellent wear resistance, or the like.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a partially cutaway side view, Fig. 2 is a sectional view taken along the front line, Fig. 3 is a perspective view of the driven wheel portion, and Fig. 4 is a partially cutaway side view. An enlarged sectional view of the main parts, FIG. 5 is a partial sectional view showing another embodiment, FIG. 6 is a schematic plan view showing the formwork mounted on a rotating centrifugal device, and FIG. 7 is a sectional view of the same. It is. A... Formwork, 1a, 1b... Half body, 3a, 3
b...Knot molded part, 6...Passive wheel, 6a, 6b
...Wheel main part, 7...Ring, 9...Adjustment screw, M...Speed motor, L...Drive shaft, L'...Driver shaft, R, R'...Roller.

Claims (1)

[Scope of Claims] 1. A half cylinder formed by opening/closingly joining a pair of half bodies having joint molded parts bulging outward at appropriate intervals in the longitudinal direction and having a semicircular cross section. In the centrifugal molding form, a passive wheel that receives rotational power is arranged approximately in the center between the joint molding parts, and the passive ring has a ring attached to the outer periphery of the main wheel part fixed to the half body. An apparatus for producing a knotted concrete pile, characterized in that the ring is provided so that its position can be adjusted in the axial direction. 2. The apparatus for manufacturing a knotted concrete pile according to claim 1, wherein the knot forming portion and the driven wheel have the same outer diameter.