JPH0652020B2 - Non-poster pole manufacturing equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a non-poster pole, that is, an apparatus for manufacturing a concrete pole for preventing sticking of paper having an uneven pattern on the surface.

Conventionally, as means for preventing the paper sticking of concrete poles such as utility poles, the utility model number 39-31370, the feature number 50-21928 and the feature number have been used.
As shown in No. 51-50523, it has been proposed to provide a large number of wart-shaped projections or a large number of horizontal stripe-shaped irregularities on the pole surface integrally with concrete. There is no suitable manufacturing method or manufacturing equipment. For this reason, generally, a thin plate made of rubber, synthetic resin, or metal having a wart-like or uneven surface is attached or attached to the surface of the pole after the building pillar. However, rubber and synthetic resin are fragile, and the metal plate is rusted, which not only impairs the aesthetic appearance but also has a defect of peeling or falling after a long time. Further, since the attachment or the attachment is performed after the building pillar, if the weather is bad, a lot of labor is required for the attachment and the attachment work, and the attachment cost including the material cost is considerably high.

As other means for preventing paper sticking, there are those that coat the surface of the pole with a film that does not adhere with normal glue, and those that contain small particles such as sand in this film to improve the paper sticking prevention effect. The method also has a drawback that the effect of preventing the sticking of paper is lost within 1 to 2 years due to degeneration of the film, and the coating must be repainted every suitable period.

Therefore, at the time of concrete pole molding, many wart-shaped or striped irregularities are integrally provided on the concrete surface so that the paper cannot be stuck or can be easily removed even if it is stuck. Although it is the best from the viewpoint of maintenance management, if the unevenness is provided on the inner surface of the normal formwork for concrete molding and concrete is driven into this formwork, it is possible to set in the concave part of the formwork. The concrete becomes a wedge and the mold cannot be demolded. In particular, ordinary poles such as utility poles are centrifugal prestressed concrete poles, so the formwork is a half-cylindrical body in order to prevent the cement paste from leaking due to centrifugal force. It has high rigidity to maintain the tension of the rod, and no matter how good the demolding agent is applied, there is no adhesive force between the mold and the concrete. The mold could not be removed unless the part became a wedge and the convex surface of the concrete was destroyed. or,
Since the inner surface of the formwork is provided with horizontal striped irregularities, even if there are concrete protrusions that have been driven into the recesses of the formwork, these protrusions extend in the lateral direction of the pole, so the mold can be removed from the mold. Although it seems possible at first glance, concrete was elastically deformed in the vertical direction of the pole due to the prestress introduced at the time of demolding, so it was also impossible to demold.

An object of the present invention is to provide a non-poster pole manufacturing apparatus that completely eliminates the above-mentioned drawbacks of the prior art.

In order to achieve such an object, according to the present invention, a mold for centrifugal molding having an upper mold half and a lower mold half which are detachably attached to each other and a mold for centrifugal molding when the upper mold half and the lower mold half are combined. A flexible sheet-shaped inner mold member having a concave portion corresponding to the convex portion of the surface of the concrete pole to be formed on the inner surface of the cylindrical shape, and for attaching the inner mold member to the formwork An apparatus for manufacturing a non-poster pole, comprising mounting means and a cage for reinforcing bars having a plurality of PC steel rods for introducing prestress into the concrete to be placed inside the inner mold member. .

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Referring to FIGS. 4 to 6, there is shown a non-poster pole manufacturing apparatus according to the present invention. The non-poster pole made by this manufacturing apparatus is composed of a concrete pole 6 and an uneven pattern 20 formed on the outer peripheral surface of this pole. The concrete pole 6 is formed by centrifugal molding, and the concavo-convex pattern is provided by integrally forming a plurality of convex portions on the outer peripheral surface of the concrete pole during this centrifugal molding.

Referring to FIG. 1, the manufacturing apparatus of the present invention includes an inner mold member 2 used for forming a concavo-convex pattern on a non-poster pole. The inner mold member 2 has, for example, a large number of convex portions 2'and concave portions 2 ".
It consists of a vinyl chloride sheet with an uneven pattern consisting of and. A zinc-plated thin iron plate 3'may be attached to the outside of this sheet for reinforcement. FIG. 2 shows a state in which the inner mold member 2 is attached to the inner surface of the mold 1. This mold 1 is a mold for normal centrifugal molding which is composed of a half-cylindrical plate which is composed of an upper mold and a lower mold, and is provided with a flange 4 and a tire 5. In order to mount the inner mold member 2 on the form 1, suitable mounting means, for example, a small bolt 9 as shown in FIG. 3A,
You may attach to the formwork 1 using the socket 8 with a screw. Fourth
The figure shows that after the inner mold member 2 is attached to the form 1, a rebar cage having a plurality of PC steel rods 7 is put in by a normal method, concrete is poured into the mold, and the mold is assembled. 7
Shows the state when the concrete is centrifugally molded by straining the mold 1 and then rotating the mold 1 by a rotating means (not shown). The concrete that has been poured in is the recess 2 ″ of the inner mold member 2.
It is sufficiently compacted by centrifugal force. Then, after steam curing by a normal method, when removing the mold, first, the small bolt 9 is removed, the mold fixing of the PC steel rod 7 is released to introduce prestress, and the mold assembly bolt is removed to remove the mold. As shown in FIG. 5, the concrete pole 6 is demolded while being covered with the inner mold member 2, for example. Apart from this, when demolding,
The inner mold member may be separated from the concrete pole together with the mold. Next, as shown in FIG. 6, when the inner mold member 2 is removed from the joint by removing the mold, a concrete pole 6 having an uneven surface is formed. This inner mold member may be peeled off after the pole is built. This is preferable because the uneven pattern is protected by the inner mold member during transportation of the pole.

As described above, the zinc-plated thin iron plate 3 ′ is attached to the inner mold member 2 made of a vinyl chloride sheet having appropriate flexibility and rigidity, and is attached to the frame 1 with the small bolts 9 and the socket 8 with screws. After molding and curing, the small bolt 9 is removed and the mold is removed, whereby the concrete pole 6 having an uneven surface can be easily obtained. Therefore, how the inner mold member 2 can be easily attached to and detached from the mold 1, whether the inner mold member 2 is in close contact with the mold assembly, whether it can be repeatedly used, and its thin thickness are It is the essential point of the manufacturing apparatus according to the invention. For this reason, another method of attaching the inner mold member 2 to the mold, for example, a method of attaching and detaching by magnetic force will be described below.

A magnet mat 3 "is attached to the outer surface of the inner mold member 2 in place of the zinc-plated iron plate 3 ', and is attached to the iron mold 1 by its magnetic force as shown in FIG. 3B to mold as described above. When the upper and lower molds are removed from each other and the mold 1 is hung up, the weight of the concrete pole 6 is larger than the magnetic force, so that the inner mold member 2 can be removed while the inner mold member 2 is covered, as in the above embodiment. The inner mold member 2 is peeled off to obtain a product. Of course, the magnet mat 3 ″ is made as thin as possible, and the sticking to the inner mold member 2 requires the periphery of the inner mold member 2 but the inner side is thick. It only needs to be in close contact when the mold is embedded,
It does not necessarily have to be pasted on the entire surface. Further, any material such as rubber or plastic may be used as long as the surface of the magnet mat is rich in abrasion resistance and lime-alkali resistance and does not deteriorate at the steam curing temperature of 75 ° C. Therefore, of course, the magnet mat may be provided with a required uneven pattern. Further, as shown in FIG. 7A, the peeling ears 10 made of cloth are attached to the inner mold member 2, and after removing the molds as shown in FIG. 7B, the peeling ears 10 are removed as shown in FIG. 7C. If the inner mold member 2 is peeled off by pulling, the inner mold member 2 can be more easily peeled off.

Next, since the place where the sticking prevention is required is near the ground and is the place where the proof strength is the highest as the pole, it is possible to reduce the outer diameter and the thickness of the pole by the thickness of the inner mold member 2 there. Not preferable. Therefore, in the above embodiment, the inner die member 2 having a thickness of less than 2 mm has a thickness of 0.3 mm of the zinc-plated iron plate 3 '.
The thickness of the inner mold member 2 is made as thin as possible and the proof stress is reduced by sticking together a magnet mat 3 ″ with a thickness of less than 1 mm. As shown, the outer diameter of a part of the shell plate of the formwork 1 is increased to provide a formwork enlarging portion 1 ', and the inner die member 2 is accommodated in the enlarging portion 1'. If it is manufactured by the above procedure, the surface of the concrete pole 6 which is in contact with the concave portion 2'of the inner mold member 2 has a shape protruding from the surface of the concrete pole 6 having no unevenness, and the yield strength is further reduced, which is preferable.

The above example is for a paper sticking prevention pole, but since this manufacturing apparatus can easily obtain a hollow prestressed concrete pole having a concavo-convex pattern, it can have structural proof strength and can be used for decoration. It can be applied to structural decorative columns. FIG. 9 shows a decorative column during centrifugal molding, and FIG. 10 shows this cross-sectional view. These drawings include
Although the outer diameter of the head and the octagonal shape are shown, by changing the outer diameter and the shape of the form 1, a decorative pillar of any shape having a concavo-convex pattern on the surface can be obtained. It can be manufactured by the same method. Also, by changing the cement or aggregate of concrete, or adding pigments, decorative columns with different colors can be obtained. Further, since the inner mold member 2 is a flat plate having a concavo-convex pattern, an application example using the shape thereof will be shown.
The inner mold member 2 of the second embodiment is a magnet mat 3 ″.
As shown in Fig. 11, the iron base 11
If it expands to the top, it becomes flat due to the magnetic force. This inner mold member 2
After spraying a mold release agent such as a silicone resin on the mold, as shown in FIGS. 12 and 13, pattern papers 12 ′ and 12 ″ are placed respectively, and a mixture of the pigment, cement and adhesive admixture is sprayed with a sprayer.
14 'and 13' are sprayed in different colors. The inner mold member 2 pretreated in this way is attached to the mold 1 to produce a concrete pole as in the above embodiment, and FIG. As shown in FIG. 5, the grid-shaped concave portions on the surface of the concrete pole 6 are plain, and the checkerboard patterns having different colors are formed like the convex surface 14 ', 14 ". In this way, the concavo-convex pattern of the inner mold member 2 and the pattern patterns of the pattern papers 12 ', 12 ", the sprayer 13',
As described above, an arbitrary color pattern can be given to the cylindrical column, the polygonal column, or the decorative column whose outer diameter is changed by the color arrangement such as 13 ″.

Next, FIGS. 15 to 26 show various forms of the uneven pattern of the sticking prevention pole. These uneven patterns, which are suitable for preventing paper sticking, have a convex area that is as small as possible than a concave area and that they are independent, which hinders the adhesive performance of the paper and improves the peeling performance. However, the present invention is not limited to these uneven patterns.

As described above, according to the non-poster pole manufacturing apparatus of the present invention, the concrete pole having the uneven pattern on the surface is formed at the time of centrifugal molding by using the inner mold member attached to the mold. In terms of demolding, the production efficiency is extremely good, and there is a real benefit. More specifically, a flexible inner mold member 2 having an uneven surface is attached to the inside of the mold 1, concrete is put into the mold, and the mold is removed from the mold 1, and then the inner mold member 2 is removed. With the manufacturing device of peeling off, the desired uneven pattern can be easily provided on the surface of the concrete pole, and not only the concrete pole for preventing paper sticking but also the decorative concrete pole that doubles as a structural material can be easily mass-produced. Of. As a secondary effect of the present invention, since the inner mold member 2 easily becomes a flat plate shape as described in the application example, a variety of patterns can be combined with the concavo-convex pattern by covering the pattern member with the pattern material and spraying the coloring material. In addition, the uneven surface of the inner mold member 2 is a glossy surface of plastic such as vinyl chloride, and the concrete pole 6 is strongly pressed against that surface by centrifugal force. The surface has the effect of becoming a glossy surface. Particularly, the convex surface of the concrete pole is the concave surface 2 ″ of the inner mold member 2.
Since it does not get scratched or abraded like the convex surface 2 ', there is a practical advantage that a more glossy and beautiful appearance can be easily obtained.

The mold is made to be magnetic or the required magnet is attached, and an inner mold member made of a polished steel plate or the like having an uneven pattern due to the magnetic force is attached and molded as in the example, and the demolding is performed. The method of peeling off the rear inner mold member is also only that the magnetized material of the second embodiment is changed from the inner mold member to the frame, which naturally belongs to the technical scope of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an inner mold member used in a non-poster pole manufacturing apparatus according to the present invention, FIG. 2 is a perspective view in which the inner mold member is attached to a mold, and FIG. 3A. And FIG. 3B is a partially enlarged sectional view showing the mounting means, FIG. 4 is a lateral sectional view of the mold after molding, FIG. 5 is a perspective view of the manufactured non-poster pole after demolding, and FIG. Is a cross-sectional view of the state in which the inner mold member is peeled off from the concrete pole, FIG. 7A, B, C
FIG. 8 is a perspective view showing a procedure for handling an inner mold member provided with tearing-off ears, and FIG. 8 is a vertical cross-sectional view showing a mold frame in which the inner diameter of the mold member is enlarged to accommodate the inner mold member. FIG. 9 is a half-cut vertical sectional view of the special form mold, and FIG. 10 is a transverse sectional view thereof.
FIG. 1 is a perspective view showing a coloring method using a paper pattern, FIGS. 12 and 13 are perspective views showing a case in which a paper pattern 12 ′, 12 ″ is placed and a pigment is sprayed, and FIG. 14 is a front view of a concrete pole as a product thereof. 15 to 26 are respective surface and cross-sectional views of the inner mold member showing various forms of the uneven pattern of the paper sticking prevention pole: 1 ... Form frame, 2 ... Inner mold member 6 ... Concrete pole

Claims (1)

[Claims] 1. A centrifugally molded prestressed concrete pole is formed integrally with a plurality of convex portions on the outer peripheral surface of the centrifugally molded prestressed concrete pole which are regularly arranged so that the paper can be peeled off. A non-poster pole manufacturing apparatus for performing a centrifugal molding process, comprising: an upper mold half and a lower mold half that are detachably attached to each other; A flexible sheet-like inner mold member which is attached to a cylindrical inner surface formed when mated and has a concave portion corresponding to the convex portion of the concrete pole on the inner surface, and for attaching the inner mold member to a mold Provided with mounting means and a rebar cage having a plurality of PC steel rods for introducing prestress into the concrete to be placed inside the inner mold member. Non-poster pole of the manufacturing apparatus comprising Te.