JPH0630406Y2 - Formwork for manufacturing tubular concrete products - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical concrete product manufacturing form for manufacturing cylindrical concrete products such as rainwater basins and manhole blocks.

[0002]

2. Description of the Related Art A conventional mold of this type is such that a basic mold for manufacturing one concrete product is independent, and an outer mold is divided into two parts and completely removed from a pedestal when demolding. It was

[0003]

That is, in the conventional mold, the outer mold, the inner mold, and the bottom mold are completely separate bodies, and they are simply assembled and integrated. Distortion was likely to occur, adversely affecting the accuracy of concrete products. For example, the verticality of the upper and lower surfaces of the product and the side surfaces and the uniformity of the product thickness are likely to cause problems. Further, since only one concrete product can be manufactured at a time with one formwork, the manufacturing efficiency was of course poor.

[0004]

The present invention is formed by a cylindrical outer mold divided into three members, a foldable cylindrical inner mold and a ring-shaped bottom mold disposed inside thereof. Place two basic molds that are filled with concrete in a tubular space to produce a tubular concrete product on a pedestal in close proximity to each other.
Of the divided outer dies, the adjacent parts are integrated and fixed to the pedestal as a fixed part, and the remaining two members of the outer dies are two hinges formed at the symmetrical positions on the center line between the basic dies as opening and closing parts. A formwork for producing a tubular concrete product, which is hinged and can be opened and closed freely.

[0005]

In the present invention, since the outer mold fixing portion is fixed to the pedestal and completely integrated, the accuracy of the product is ensured and the durability is excellent. Since the outer mold opening and closing part opens and closes like a door, demolding and assembly work is easy and workability is good. It is also excellent in productivity because two molds are taken with one mold.

When the inner mold is a foldable type of three members including a central basic part and folding parts hinged to both sides thereof, and the basic part and the bottom mold are integrated, the rigidity is further increased, and in particular, the verticality of the inner mold is improved. Is improved and the accuracy of the product wall thickness can be obtained. Furthermore, by locating the basic part of the inner mold outside the center line between the basic molds, as shown in FIG. 4, the product can be demolded without moving the inner mold, so that the bottom mold can be removed. It can be fixed to the pedestal, which allows all the outer, inner and bottom parts to be integrated for maximum rigidity and product precision.

[0007]

1 to 3 relate to a mold 1 which is an embodiment of the present invention. This formwork 1 is for producing a cylindrical concrete product that constitutes a manhole, and is composed of an outer mold, an inner mold 4, a bottom mold 5, a pedestal 6 and the like made of an iron plate and a reinforcing steel material, respectively. The mold can produce two concrete products at once. The outer mold is composed of a fixed part 2 and an opening / closing part 3. The fixing portion 2 is welded and fixed to the pedestal 6, and as shown in FIG. 1, the two basic types are completely combined and integrated, and the constricted portion 7 is formed so that both side surfaces become a part of the cylindrical surface. ing. By being integrated in this way, the rigidity can be increased and the accuracy of the product can be further improved. A hinge 8 is welded and fixed to the center of the side surface perpendicular to the constricted portion 7, and an outer opening / closing portion 3 is hinged to the opening / closing portion 3 so as to be openable / closable. Hinge 8 is the center line c between basic types
There is a symmetrical position on the upper side, and this position is the opening / closing part 3 on the line.
Is set at a position where it can be smoothly opened and closed, but it is usually arranged considerably outside as in this embodiment. The inner mold 4 is composed of a basic part 9, folding parts 10, 11, etc., and the basic part 9 is a bottom mold 5.
It is fixed by welding. Hinges 14 are provided at both ends of the basic portion 9, and one end of each of the folding portions 10 and 11 is hinged thereto. A fastening tool 12 is pivotally attached to the folding part 10, and a receiving plate 13 is welded and fixed to the folding part 11. The bolt 15 of the fastening part 12 engages with the receiving plate 13 for fastening. Is done. By making the inner mold foldable in this way, a large internal space can be secured, and when it is released from the mold, it becomes extremely small by folding, so that the mold demolding work and cleaning work can be performed very easily. . The bottom die 5 has a ring shape and is placed on the pedestal 6 and can slide.

In the manufacture of concrete products, concrete is put into a formwork in an assembled state as shown in FIG. After the concrete hardens, as shown in FIG. 2, the outer mold opening / closing part 3 is opened, the bolt 15 of the inner mold fastening tool 12 is rotated to release the tightening, and the folding parts 10 and 11 are folded inward. Further, the inner mold 4 and the bottom mold 5 are slid on the pedestal 6 together with the concrete product a to separate the fixed portion 2 from the concrete product a. Then, the concrete product a is lifted to complete the demolding. By cleaning the formwork, assembling it, and setting the reinforcing bars, the concrete is ready to be put in again, and such work is repeated.

FIG. 4 relates to a formwork 20 which is another embodiment.
The mold 20 is different from the mold 1 of the above-mentioned embodiment in that the inner mold 22 is
Is the positional relationship. That is, as shown in FIG. 4, the basic part 23 of the inner mold 22 is located outside the center line c between the basic molds, and the basic part is fixed to the bottom mold and the bottom mold to the pedestal 24. There is. That is, the outer mold, the inner mold, the bottom mold, and the pedestal are all integrated. Therefore, the rigidity of the formwork is extremely large, and it is possible to manufacture a concrete product with excellent accuracy. To remove the product from the mold, the concrete product a may be lifted in a state in which the outer mold is opened and the inner mold 22 is folded as shown in FIG. The mold 20 can obtain a product with higher precision than the mold 1, but the work efficiency of taking out the product at the time of demolding is slightly inferior.

[0010]

[Effects of the Invention] In the present invention, since the outer fixed part is fixed to the pedestal and completely integrated, the accuracy of the product is ensured and the durability is excellent. If the two basic type fixing parts are completely integrated as in the embodiment, the rigidity is further increased and the product precision and durability can be further improved. Since the outer mold opening and closing part opens and closes like a door, demolding and assembly work is easy and workability is good. It is also excellent in productivity because two molds are taken with one mold.

[Brief description of drawings]

FIG. 1 is a top view of a form 1 for manufacturing a tubular concrete product according to an embodiment of the present invention.

FIG. 2 is a schematic top view of a mold 1 in a demolded state.

FIG. 3 is a schematic cross-sectional view of the formwork 1.

FIG. 4 is a schematic top view of the mold frame 20 in a demolded state. 1 Formwork 2 Fixing Part 3 Opening / Closing Part 4 Inner Mold 5 Bottom Model 6 Pedestal 7 Constriction Part 8 Hinge 9 Basic Part 10 Folding Part 11 Folding Part 12 Tightening Tool 13 Catch Plate 14 Hinge 15 Bolt 20 Formwork 21 Fixing Part 22 Inner type 23 Basic part 24 Pedestal

Claims (3)

[Scope of utility model registration request] 1. A concrete space is filled with concrete in a cylindrical space formed by a cylindrical outer mold divided into three members, a foldable cylindrical inner mold arranged inside thereof, and a ring-shaped bottom mold. 2 basic molds for producing tubular concrete products are arranged close to each other on the pedestal, and parts of the outer molds that are divided into 3 are adjacent to each other and fixed to the pedestal as fixed parts.
The remaining two members of the outer mold are hinged to two hinges that are formed symmetrically on the center line between the basic molds as opening and closing parts, and are openable and closable. 2. The tubular shape according to claim 1, wherein the inner die is a foldable type of three members, that is, a central basic portion and folding portions hinged to both sides thereof, and the basic portion and the bottom die are integrated by welding or the like. Formwork for manufacturing concrete products 3. The formwork for producing a tubular concrete product according to claim 2, wherein the basic part of the inner mold is located outside of the center line between the basic molds, and the bottom mold is fixed to the pedestal.