JPH085783Y2 - Formwork for centrifugally molded concrete products - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a mold for a centrifugally molded concrete product, and in particular, for a centrifugally molded concrete product that prevents the leakage of slurry from the joint portion of the mold. It concerns the formwork.

[Prior Art] Conventionally, long concrete products such as concrete poles are manufactured by centrifugal molding. This type of centrifugally molded concrete product formwork often uses split formwork consisting of an upper formwork and a lower formwork. First, insert the reinforcing bar cage into the lower formwork, and then cover the upper formwork. Bolt the joint.

Figure 7 attached to the attached sheet shows the joint part of the form,
An upper mold angle (2) is fixed in the longitudinal direction of the upper mold (1), and a lower mold angle (4) is fixed in the lower mold (3). A hollow round-shaped packing (5) is provided on the joint surface of both angles (2) and (4), and the packing packing (6) is used to move the packing (5) to the outside. Stopped,
The slurry leaking from the joint portion (7) of the upper mold (1) and the lower mold (3) is prevented from leaking to the outside of the mold (1) by the packing (5).

[Problems to be Solved by the Invention] In a conventional mold, a hollow round-shaped packing (5) is interposed at a joint portion of an upper mold angle (2) and a lower mold angle (4). Since 5) has a relatively small diameter, the contact area is small. Here, the upper tire (8) and the lower tire (9) are directly subjected to the vibration during centrifugal molding, and the strong vibration is also transmitted to the parts close to both tires. However, since the hollow round-shaped packing (5) has a small repulsive force, when it is used in the vicinity of the tires (8) and (9), the slurry leaks to the outside from the clearance of the packing (5) during centrifugal molding. I have something to do.

Therefore, there is a technical problem to be solved in order to improve the adhesion at the joint portion of the tire and prevent the leakage of the slurry, and the present invention aims to solve this problem. .

[Means for Solving the Problems] The present invention has been proposed in order to achieve the above-mentioned object, and is a centrifugal molding mold in which a tire is provided on the outer circumference of a split mold consisting of upper and lower molds. A rubber packing that is interposed between the upper and lower angles provided at the joint portion of the tire, wherein a groove formed in the longitudinal direction is provided on one surface of the belt-shaped packing, and the surface having the groove of the packing. It is intended to provide a mold for a centrifugally molded concrete product, characterized in that the mold is attached to the angle-contacting surface of one of the molds.

[Operation] According to this invention, the band-shaped packing having the groove is provided between the upper and lower angles provided at the joint portion of the tire.
The groove of the packing is provided in the longitudinal direction of the mold,
The packing is compressed by tightening the upper and lower angles, and the groove absorbs the contraction of the volume. Thus, the thin portion of the groove is curved toward the inside of the groove, a slight gap is generated on the back surface side of the thin portion, and the pressure is reduced, and the adhesion between the angle and the packing is improved. Therefore, even if vibration is transmitted from the tire during centrifugal molding, it is possible to prevent the slurry from leaking to the outside between the upper and lower angles.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to FIGS. FIG. 1 shows a formwork (10) for centrifugally molded concrete products, which is a cylindrical split formwork consisting of an upper formwork (11) and a lower formwork (12). Upper mold angles (13) (13) and lower mold angles (14) (14) are provided in the part. Tightening bolts (15) (15) are fixed to the upper mold angle (13) at predetermined intervals, and a connecting arm (16) is provided on the lower surface of the lower mold angle (14). It is formed so that the connecting arm (16) is locked to the lower ends of (15), (15), and the upper formwork (11) and the lower formwork (12) are fastened. Further, a steel upper mold tire (17) and a steel lower mold tire (18) are provided on the outer periphery of the mold (10) so that the mold (10) can roll when moving.

FIG. 2 shows a joining portion of the upper and lower tires (17) and (18) in a state where the upper mold frame (11) and the lower mold frame (12) are separated from each other.
The joint surface (11a) of the upper mold (11) is located above the joint surface (13a) of the upper mold angle and the joint surface (17a) of the upper tire, and the joint of the lower mold (12). The surface (12a) is positioned above the lower angle joint surface (14a) and the lower tire contact surface (18a), and is in one-row inlay state. Further, a rubber packing (19) is attached to the joining surface (14a) of the lower die angle. If the packing (19) is explained with reference to FIG. 3 and FIG. A groove (20) is drilled in the longitudinal direction on one side of the packing (19) formed on the
A thin iron plate (21) of about m is attached. This iron plate (2
1) is for facilitating the handling of the packing (19) and is not always required, and
The shape and the number of the groove portions (20) are not particularly limited. Then, the iron plate (21) of the packing (19)
The surface to which is attached is placed on the lower mold angle contact surface (14a) in the vicinity of the tire (18). At a position away from the tire (18), a hollow round packing (22) is used as in the conventional case.
Put on and attach the packing (23) to the packing board (23).
The movement of the outside of the padlock (19)
Attach both ends (21a) of the iron plate (21) of this to the packing plate (2
Hold down 3).

Then, a reinforcing rebar cage (not shown) is inserted into the lower mold (12) fitted with the packings (19) and (22), and the upper mold (11) is covered as shown in FIG. To wear. After that, the connecting arm (16) described in FIG. 1 is slid and locked to the tightening bolts (15) (15) ..., and the upper mold (11) and the lower mold (1
2) Conclude with. As shown in FIG. 6, the packing (19) is in a compressed state between the abutment surface (13a) of the upper die angle and the abutment surface (14a) of the lower die angle, and its volume contraction amount is The grooves (20) (20) absorb. Then, the thin portion (24) near the groove (20) is curved toward the inside of the groove (20), and a slight gap is formed on the back surface side of the thin portion (24) to form the depressurized portion (25). Therefore, the adhesion between the joining surface (13a) of the upper die angle and the packing (19) is improved. Therefore, the packing effect of the packing (19) is wide in the shape of a band, and the sealing effect is remarkably improved, and vibrations from the tires (17) (18) are transmitted during centrifugal molding, so that the joining surfaces of the upper and lower molds ( Even if the slurry leaks from 11a and 12a, the slurry is not leaked to the outside of the mold because it is blocked by the packing (19).

It should be noted that this invention can be modified in various ways without departing from the spirit of this invention, and it goes without saying that this invention extends to the modified version.

[Effect of the Invention] As described in detail in the above-mentioned one embodiment, the present invention interposes a packing having a groove between the upper and lower angles in the vicinity of the joint portion of the tire where the mold is most deformable, Due to the depressurizing portion that occurs in the packing when the upper and lower molds are tightened, the adhesion between the mating surface of the angle and the packing is significantly improved. Therefore, it is a device that can prevent the slurry from leaking to the outside of the mold and can significantly contribute to the improvement of the quality of the molded concrete product.

[Brief description of drawings]

1 to 6 show an embodiment of the present invention. FIG. 1 is a side view showing the entire formwork, and FIG. 2 is a longitudinal section of a main part with the upper formwork and the lower formwork separated from each other. A plan view and FIG. 3 are A- of FIG.
A line A arrow view, FIG. 4 is a BB line arrow view of FIG. 3, and FIG. 5 is a longitudinal cross-sectional view of an essential part in a state where an upper mold and a lower mold are joined.
The figure is an enlarged vertical sectional view of the main part. FIG. 7 shows a conventional example, and is a longitudinal sectional view of an essential part in a state where an upper mold and a lower mold are joined together. (10) …… Formwork, (11) …… Upper formwork (12) …… Lower formwork, (13) …… Upper mold angle (14) …… Lower mold angle, (17) (18) …… Tire (19) …… Packing, (20) …… Groove (24) …… Thin-walled part, (25) …… Decompression section (11a) (12a) (13a) (14a) (17a) (18a) …… Mixed Contact

Claims (1)

[Scope of utility model registration request] 1. A centrifugal molding form in which a tire is provided on the outer periphery of a split form frame composed of upper and lower forms, and a rubber packing which is interposed between the upper and lower angles provided at a joint portion of the tire. A centrifugally molded concrete characterized in that a groove formed in the longitudinal direction is provided on one surface of a band-shaped packing and the surface having the groove of the packing is attached to an abutting surface of the angle of one of the molds. Product formwork.