JPH0780818A - Form for molding projection and recesses of concrete - Google Patents

Abstract

PURPOSE:To prevent projected parts of a pattern forming sheet from being crushed by the pressure of a concrete even if a relatively thin sheet is used as the pattern forming sheet. CONSTITUTION:As a pattern forming sheet 1, a thin material having shape retention properties can be used. A number of projections and recesses are randomly formed, for example, in a bricked form on the surface of a hard and thin sheet of, for example, vinyl chloride, polystyrene, or polypropylene by vacuum forming. Recessed parts 1b are formed on the flat surface part and, as a result, the remaining part forms projected parts 1a of the pattern forming sheet. A supporting frame 2 is abutted on the back surfaces of the projected parts 1a (the top surface) of the pattern forming sheet 1. In this manner, the load of a concrete is transmitted to the recessed parts of the pattern forming sheet as a tensile load. The tensile load is transmitted to the support frame abutted on the back surfaces of the projected parts. The pattern forming sheet having a high strength to a tensile load can keep its shape in cooperation with the supporting rigidity of the supporting frame without crushing the projected part of the pattern forming sheet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete molding form for forming a plurality of uneven patterns on the surface of a concrete molded body.

[0002]

2. Description of the Related Art When intentionally forming an uneven pattern on the surface of a concrete structure, a styrofoam block or the like is attached in advance to the surface of a mold having a weir plate, and the portion is used as a recess to form an uneven shape There is a method of forming. However, since the exfoliation property between the styrofoam block and concrete is poor and the styrofoam particles are likely to remain on the concrete surface, there is a problem that a complicated removal work is required after the mold is removed. Therefore, for example, when molding a relatively simple repetitive pattern, a form is used in which a hard thin sheet of vinyl chloride, polystyrene, polypropylene or the like having an uneven pattern formed by vacuum forming is attached to the surface of the barrier plate. It is more convenient.

[0003]

However, in the case of this type of sheet, when the recess is formed to some extent deep, the projecting portion is crushed by the placing pressure of the concrete, and it becomes useless as a mold surface. On the other hand, it is possible to increase the strength of the convex portion by increasing the thickness of the sheet to some extent, but this makes vacuum forming itself difficult and uneconomical.

The present invention has been made to solve the above problems. Even when a relatively thin sheet is used as a mold surface for pattern molding, it is possible to prevent the projections from being crushed due to concrete pressure. The purpose is to provide a formwork.

[0005]

In order to achieve the above-mentioned object, the present invention supports a mold face sheet made of plastic having a plurality of concavo-convex shapes corresponding to the surface pattern of a concrete molded body, and the mold face sheet. Therefore, a lattice-shaped support frame that contacts the back surface of the convex portion is provided.

[0006]

According to the above construction, when the casting pressure of concrete is applied to the mold surface sheet, the load is transmitted as a tensile load to the concave portion of the mold surface sheet, and this tensile load is brought into contact with the back surface of the convex portion. It will be transmitted to the support frame. Since the die face sheet has high strength against a tensile load, the shape of the die face sheet is maintained without being crushed together with the supporting rigidity of the support frame.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a mold for concavo-convex molding of concrete according to the present invention, where 1 is a mold sheet and 2 is a support frame for supporting the mold sheet 1.

The mold surface sheet 1 is formed of a material having shape-retaining property even if it is thin, for example, a hard thin sheet of vinyl chloride, polystyrene, polypropylene or the like, by vacuum forming on the surface thereof, for example, in a brick-stacked form. A large number of concavities and convexities are formed, and the convex portion 1a of the mold surface sheet 1 in this embodiment is constituted by a portion left as a result of forming the concave portion 1b on the flat plate-shaped surface portion. In this embodiment, the bottom of the concave portion 1b (the surface of the convex portion of the concrete molded body) is flush.

The support frame 2 is, for example, made by vertically or horizontally assembling steel or lumber, and is composed of a plurality of horizontal members 2a and a plurality of vertical members 2b connecting the horizontal members 2a alternately. . The support frame 2 is the mold sheet 1
Is abutted on the back surface of the convex portion 1a (front surface portion), that is, is disposed between the concave portions 1b. The support frame 2 is designed to have a support rigidity that is sufficient to withstand the pouring pressure of concrete.

Such a formwork is erected by a supporting member (not shown) along the outer shape of the concrete molded body to be constructed, as shown in FIG.
Concrete 5 is poured as shown in (b). At this time, the load P of the concrete 5 applied to the template sheet 1
Acts as a tensile load in the concave portion 1b, and this tensile load is applied to the concave portion 1b with the contact point with the supporting frame 2 as a base point. As a result, the supporting frame 2 located on the back surface of the convex portion 1a receives the load P.
Will be received. Since the mold surface sheet 1 has high strength against a tensile load, in combination with the support rigidity of the support frame 2, the convex portion 1a of the mold surface sheet 1 is not collapsed and its shape is maintained.

Concrete 5 after demolding the formwork
As shown in FIG. 3, the surface of the molded body of FIG.
Thus, the surface repeating pattern in which the joint-shaped groove 5b is formed between the brick-shaped convex portions 5a, which is an inverted pattern of the concave-convex shape, is formed.

Since the mold face sheet 1 receives the load of the concrete 5 as a tensile load, it is not destroyed even if a deep recess 1b of about 50 mm to 60 mm is formed.

In the above embodiment, the depths of all the recesses 1b formed in the mold surface sheet 1 are constant, but they can be changed to various ones, in which case various patterns can be molded. .

Further, in the above-mentioned embodiment, the remaining portion of the flat sheet is formed by vacuum forming the concave portion 1b to form the convex portion 1a. However, the convex portion 1a may of course be formed by vacuum forming. Is. In this case, a variety of patterns can be formed by changing the height of the convex portion 1a to various shapes.

Further, the back surface of the support frame 2 may be supported by a flat reinforcing plate. In this case, it is possible to improve the torsional rigidity of the entire formwork, improve the workability of the concrete placing work, and protect the uneven shape of the form face sheet 1. Further, if the bottom of the concave portion 1b is brought into contact with the surface of the reinforcing plate, the concave portion 1b is prevented from swelling by the cast concrete, so that the load resistance can be further improved.

[0016]

As described above in detail with reference to the examples, in the concrete concavo-convex molding form according to the present invention, when the load is applied during the placing of the concrete, the load is applied to the form sheet. The tensile load is transmitted to the concave portion as a tensile load, and this tensile load is transmitted to the support frame that is in contact with the back surface of the convex portion. Since the die face sheet has high strength against a tensile load, the shape of the die face sheet is maintained without being crushed together with the supporting rigidity of the support frame.
Therefore, even if a relatively thin sheet is used, it is possible to form a deep uneven shape to some extent, and this type of sheet can form a wide area at a time into an uneven repeated pattern by vacuum forming, etc. Has a special effect that it is easy and economical to produce.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a concavo-convex molding frame according to the present invention.

FIG. 2A is a cross-sectional view showing a state where the same mold is assembled. (B) It is a fragmentary sectional view of the state where concrete was poured in the same formwork.

FIG. 3 is a cross-sectional perspective view of a concrete molded body using the mold.

[Explanation of symbols]

 1 mold face sheet 1a convex part 1b convex part 2 support frame 5 concrete

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norihiko Miura 2-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation, Tokyo Headquarters (72) Inori Takenori 2-chome, Kandaji-cho, Chiyoda-ku, Tokyo No. 3 Incorporated company Obayashi Gumi Tokyo headquarters (72) Inventor Masami Kurihara 2-3 chome, Kandajimachi, Chiyoda-ku, Tokyo Incorporated company Obayashi Gumi Tokyo headquarters

Claims (1)

[Claims] 1. A mold face sheet made of plastic having a plurality of irregular shapes corresponding to the surface pattern of a concrete molded body, and a lattice-shaped support frame that abuts the back surface of the convex portion to support the mold face sheet. A mold for concavo-convex molding of concrete, characterized by having.