JPS6229202B2 - - Google Patents

Description

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

Conventionally, most of the concrete piles known as foundation piles have a cylindrical shape, so when manufacturing them, a right cylindrical formwork and a rotating centrifugal device with two rows of rollers are used. The above-mentioned formwork is usually placed on the driving rollers of a rotating centrifugal device, and the formwork is rotated by the rotation action of the rotating centrifugal device, thereby applying centrifugal force to the concrete material filled in the formwork. The pile was formed into a single piece with a pre-loaded core material.

However, if the concrete pile to be manufactured is a so-called knotted pile that has knots at the required intervals, it is necessary to provide knot forming parts in the formwork itself at the required intervals, but if the concrete pile is a cylindrical type Providing outwardly bulging joint molding parts on the frame makes the frame irregularly shaped, complicates the structure, and causes uneven axial weight balance, which makes it difficult to use this in the high-speed rotation centrifugal molding equipment mentioned above. In some cases, depending on the position of the driven wheel that receives the rotational power, the balance during rotation tends to collapse, resulting in problems such as material separation and weakening of the pile body. In other words, the applicant has developed a half-cylindrical formwork having joint forming sections at required intervals as a formwork for forming this type of knotted concrete pile, and centrifugally forming the center part between the joints. (Japanese Unexamined Patent Publication No. 53-57217) proposed a passive wheel for A large amount of concrete gathers inside the diameter-shaped joint forming part and the weight of this part becomes heavier than that of the body, so the centrifugal force due to the rotational action increases at this joint part, resulting in an imbalance in rotation. There is also the particular problem that it becomes unstable and tends to run out, and that the load on the joints between the half bodies that make up the formwork increases, making it impossible to rotate them at very high speeds.

In view of the above, the present invention aims to provide each driven wheel, which serves as a receiving part of the formwork, particularly at a joint forming part or a position close to the side thereof, to improve the balance during rotation and prevent the occurrence of runout. This is what I did.

Next, embodiments of the present invention will be described based on the drawings.
1a and 1b are joint molded portions 3a and 3b that bulge outward at appropriate intervals in the longitudinal direction of the body portions 2a and 2b.
This pair of half bodies 1a and 1b constitutes a half cylindrical centrifugal molding 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 tightening and tightening the fastener 5, the half-split body 1
a, 1b can be joined and divided.

6 are passive wheels that receive rotational power, and each of the passive wheels 6 is arranged at each of the joint molded portions 3a, 3b or at a position adjacent to the side thereof, and is connected to the half bodies 1a, 1.
It is formed in half shape corresponding to b, 6a, 6
b indicates the dividing ring.

The driven wheel 6 may be provided with split rings 6a and 6b on the outer periphery of the joint molded portions 3a and 3b as shown in FIGS.
It is also possible to provide the driven wheels 6 at positions close to both sides of the joint portions 3a and 3b, especially in the latter case.
It is desirable to set the diameter to be larger than 3b. Of course, the outer diameter of the driven wheel 6 is the flange 4a, 4
Taking into consideration the protruding portion of b, the flanges 4a and 4b are made so that they do not get in the way of rotation.

Furthermore, as another embodiment of the driven wheel 6, it is possible to provide split rings 6a and 6b that cover the joint molded portions 3a and 3b by using the above two embodiments together as shown in FIG. can.

In any of the above embodiments, the divided rings 6a and 6b constituting the driven wheel 6 may be formed separately and fixed integrally to the half bodies 1a and 1b by welding, bolts, nuts, etc. Half body 1a, 1 by casting
It may be formed integrally with b.

Furthermore, as another embodiment of the driven wheel 6, as shown in FIG. 7, a ring 8 may be detachably attached to the outer periphery of the half-shaped wheel main parts 7a and 7b fixed to the half bodies 1a and 1b. Can be done. Ring 8 is the main part 7
It is attached to a and 7b using an engaging means such as a bolt so that it does not come off naturally and does not interfere with frictional transmission. This ring 8 is desirably made of a material with excellent wear resistance. Further, the ring 8 is usually formed in a half-shape in order to be detachable, but if it is made of an elastic material, it may be formed in a ring-shape with one part cut so as to be expandable.
In the case of this embodiment, since the ring 8 is removable, there is an advantage that wear can be dealt with by replacing the ring 8.

Furthermore, in the embodiment in which the ring 8 shown in FIG.
A circumferential groove 9 is provided on the outer periphery of the ring 8, and a ring 8 is fitted into the circumferential groove 9, and the ring 8 is held from both sides by adjusting screws 10 such as bolts. It can be provided so as to be finely adjustable in the direction. In this case, there is an advantage that overall balance adjustment becomes easier.

Ribs 11a and 11b are provided in the longitudinal direction of the half bodies 1a and 1b to maintain balance with the flanges 4a and 4b.

FIGS. 8 and 9 show the centrifugal molding form A having the above-mentioned configuration mounted on a rotating centrifugal device, and M in the figures indicates a variable speed motor for driving;
P and P' are transmission pulleys, and L and L' are a driving shaft and a driven shaft arranged in parallel at an appropriate interval. Rollers R and R' are attached to the shafts L and L' at required positions, respectively. The rollers R, R' are arranged so as to come into contact with the driven wheels 6a, 6b of the formwork A.

Next, to explain the method for manufacturing knotted concrete piles using the apparatus of the present invention, first, the half-split bodies 1a, 1
Divide opening b and load core material such as a reinforcing bar basket into one half body 1b of formwork A, and fill with a predetermined amount of concrete material made by mixing cement, gravel, sand, water, etc. However, the second half of the body 1a,1
b are joined and fastened, and at the same time, circular lids (not shown) are fitted to both ends of the formwork A. Then, formwork A in the above state is transferred to roller R of a rotating centrifugal device.
It is mounted on R' and is rotated by the variable speed motor M while gradually increasing the speed. When the roller R on the drive shaft L rotates, the rotation is transmitted to the driven wheel 6 that comes into contact with the upper part, and the formwork A rotates. The rotation of the formwork A generates a centrifugal force on the concrete material to be filled inside, and as a result, the knotted concrete pile is easily and reliably formed within the formwork A.

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 in the apparatus of the present invention, each passive wheel receiving rotational power has a plurality of joint forming parts or Since it is disposed near the side, the centrifugal force due to rotation during centrifugal molding is the largest and is likely to cause runout, so it is supported at the pancreatic joint molding part or at a position close to the side. During centrifugal molding using high-speed rotation,
There is no core runout in the joint molded parts, and the diameter of the body between the joint molded parts is smaller than that of the joint molded parts, and the thickness of the concrete inside is less than that of the joint parts. Therefore, the influence of centrifugal force accompanying rotation is very small, and in particular, the rotational balance is better than when supported and supported at the center between joints, and almost no vibration occurs. Therefore, according to the apparatus of the present invention, it is possible to reliably fill the concrete material up to the ends of the joints, and there is no risk of material separation or deformation of the pile body. Further, during centrifugal molding, no excessive load is applied to the joints between the halves, especially the joints of the joint molded parts, and the filled concrete material does not leak. As described above, according to the present invention, the frame can be supported at the part where the centrifugal force is greatest by the passive wheels arranged at the joint forming part or at a position close to the side thereof. There is very little vibration that imparts vibration, and there is no fear of adhesion or separation within the formwork due to the vibration or other factors, and it is possible to manufacture consistently strong knotted concrete piles extremely reliably and efficiently.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is a side view of the half body separated, Fig. 2 is a sectional view of the joined state taken along the line - front figure, and Fig. 3 is a main part. A perspective view, FIG. 4 is a vertical side view of the main part, FIGS. 5 to 7 are partial vertical side views showing different embodiments, and FIG. 8 is a formwork mounted on a rotating centrifugal device. The schematic plan view and FIG. 9 are sectional views of the same. A...Form for centrifugal molding, 1a, 1b...Half body, 2a, 2b...Body part, 3a, 3b...Knot molding part, 6...Passive wheel, 6a, 6b...Divided ring,
7a, 7b...ring main part, 8...ring.

Claims (1)

[Scope of Claims] 1. A pair of half halves which have a plurality of joint molded parts bulging outward at appropriate intervals in the longitudinal direction and have a semicircular cross section and are openable and closable. 1. An apparatus for manufacturing a knotted concrete pile, characterized in that, in a cylindrical centrifugal forming form, each passive wheel that receives rotational power is arranged at a joint forming part or at a position close to the side thereof. 2. The apparatus for manufacturing a knotted concrete pile according to claim 1, wherein the passive wheel is provided on the outer periphery of the knotted part. 3. The apparatus for manufacturing a knotted concrete pile according to claim 1, wherein the passive wheels are provided at positions adjacent to both sides of the knot forming portion. 4. The apparatus for manufacturing a knotted concrete pile according to claim 1, wherein the passive wheel is provided in a form that covers the knot-formed portion. 5. The apparatus for manufacturing a knotted concrete pile according to any one of claims 1, 2, and 4, wherein the passive wheel is formed by detachably attaching a ring to the outer periphery of the main wheel portion. 6. The knotted concrete pile manufacturing apparatus according to claim 5, wherein the ring is provided so that its position can be adjusted in the axial direction.