JP3225305B2 - Synthetic resin unit frame for building formwork - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin unit frame which is a constituent unit of a formwork for construction (including a formwork for civil engineering work) used in concrete casting work and the like.

[0002]

2. Description of the Related Art Conventionally, as a form frame of this type, a hard and thick wood plywood or steel plate is used as a face plate, and flanges (including square members) and ribs (including square members) are formed from the periphery thereof. It is a standing structure.

[0003] Therefore, conventional molds generally have a considerable weight and are not always easy to handle, and in the case of wooden ones, durability is particularly high, such as increased weight due to water absorption and early deterioration due to repeated water absorption and drying. There was also a problem. In addition, since the surface layer of the hardened concrete adheres to the steel plate or the wooden board, not only irregularities are generated on the concrete surface after removing the formwork, but also the concrete attached to the formwork surface must be removed before the next use. No.

[0004]

For this reason, some attempts have been made to extrude or draw an aluminum material into a "harmonic" cross section for the purpose of weight reduction. Extrusion or pulling out of irregularly shaped structural members is by no means easy, and daring to do so would lead to increased manufacturing costs. Further, aluminum has an affinity for concrete, like steel and wood, so that the problem that hardened concrete adheres to the surface of the aluminum formwork remains unsolved.

Accordingly, the present invention provides a unit frame which is lightweight, has sufficient strength, and has a dimension which is a fraction of the dimension of the mold frame, is integrally formed of a synthetic resin material, and is easily connected by being used. An object of the present invention is to provide a unit frame capable of assembling a mold having a fixed size, thereby alleviating the conventional problems.

[0006]

In order to achieve the above object, the present invention takes the following technical measures. That is, in the present invention, the molded article is an integrally molded product made of a synthetic resin, and the short side has the same size as the long side of the form, and the short side has a size that is an integral number of the long side of the form. The flat plate (1) has a flat surface, one surface of which is formed as a flat surface, and the other surface of which has a large number of hexagonal concave holes (2) in plan view having a partition wall. ) ... is a honeycomb structure formed by, and, the bottom of each hexagonal recessed hole (2) is obtained by a structure formed by rounded.

[0007]

[0008]

A plurality of unit frames, for example, six unit frames are connected together with their long side edges adjacent to each other to form one mold frame (B). For this connection, long and short wooden timbers (3) and (4) as shown in FIG. 2 are used. These wooden timbers (3) and (4) are placed on the edge of the concave surface of the formwork to be formed and joined by means such as nailing.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a unit frame (A) for forming a rectangular fixed frame (B) having a width of 1800 mm and a length of 600 mm will be described below with reference to the drawings. 1 to 3 , the unit frame (A) includes a face plate (1) formed by melt-extruding a polypropylene resin. The thickness of the face plate (1) is, for example, 12 mm, but may be thinner or thicker.

The unit frame (A) has a long side whose length is the length of a short side of a generally used mold (600 mm in this example), and the short side is the length of the long side of the mold. 1800 mm is set to 1 / integer, and in this example, 1/6 (300 mm).

The surface (1a) of the face plate (1) of each unit frame (A) is substantially a concrete casting surface and is formed as a flat surface, and the back surface (1b) (in the drawing, the upper surface) is formed. Is constituted by a honeycomb structure formed by a large number of hexagonal concave holes (2) in plan view separating the partition walls.

The diameter of the concave hole (2) is as shown in FIG.
Home tie (5) used when assembling formwork on site
It is necessary to form the hole so that the hole does not collapse.
For this purpose, the hole diameter is a typical home tie seat diameter of 23-4.
It is formed with a thickness of 20 mm or less smaller than 0 mm. Also concave hole (2)
It is necessary to make the bottom thickness of the steel sheet sufficiently thick to withstand the pressure at the time of placing concrete, and for example, is preferably about 3 mm. The bottom corner of the concave hole (2) is preferably rounded as shown in FIG. This facilitates cleaning of the concave portion.

The synthetic resin as a material of the unit frame (A) may be selected from appropriate ones having excellent releasability and durability, for example, polypropylene resin, acrylic resin, polycarbonate resin or FRP.

The unit frame (A) has the conventional dimensions of a commonly used mold as described above, that is, 600 mm long and 1800 mm wide.
(In general, 1500 mm is used for civil engineering). One example is 300mm long and 600mm wide
Advantageously, a unit frame in which six (or five) unit frames of mm can be arranged and connected in a horizontal row, that is, a unit frame of 1/6 (or 1/5) size is used. This is because, in general, civil engineering works and the like often use dimensions that are multiples of 300 mm, and dimensional changes during construction are also often made in 300 mm units.

[0015]

FIG. 4 shows a modification of the unit frame (A) according to the present invention, in which a wooden timber is attached to the short side edge of the back surface (1b).
Steps (1c) for mounting (3) and (3) are formed. Accordingly, the connection between the wooden timbers (3) and (3) and the unit frame (A) can be more easily and reliably performed, and the assembling operation of the mold (B) is facilitated.

Although the embodiments which are considered to be representative of the present invention have been described above, the present invention is not necessarily limited to only the structures of the embodiments, but has the constitutional requirements of the present invention and the object of the present invention. Is achieved, and the present invention can be implemented with appropriate modifications within a range in which the following effects can be obtained.

[0018]

As described above, the synthetic resin unit frame for a building form according to the present invention is formed with a flat surface as described above.
Various types of civil engineering work, including a lightweight, strong, long-lasting, and concrete-casting construction because the honeycomb structure is formed by a large number of hexagonal concave holes on the other side that separate the partition walls. It greatly contributes to the improvement of efficiency. In addition, since the synthetic resin face plate has good releasability of concrete, a beautiful concrete surface can be formed, and the conventional extra work of peeling off the adhered concrete is not required. A particularly important advantage is, for example,
Compared to the case where a large form such as 1800 mm in width is integrally formed by injection molding, it is easy to manufacture because a mold of a fraction of the size is required, and it is light and compact, so transportation, assembly and disassembly are easy. Easy.

[0019] Furthermore, the normal formwork is liable to be damaged at both ends, particularly at the corners, due to repeated use. In such a case, the entire formwork must be discarded. When combined to form a formwork,
It is economical because it is only necessary to replace the unit frame of the damaged part, and the workability is good because the dimensions of the mold can be adjusted by the number of unit frames to be connected. Further, the bottom of each of a number of hexagonal concave holes separating the partition walls.
Since the portion is formed to have a rounded shape, it also has an effect of facilitating cleaning of the concave portion after use.

[Brief description of the drawings]

FIG. 1 is an overall plan view showing an embodiment of a unit frame according to the present invention.

FIG. 2 is a perspective view showing a state where a plurality of the unit frames are connected.

FIG. 3 is a sectional view showing a relationship between the unit frame and a home tie.

FIG. 4 FIG. 10 is a view showing still another embodiment of the unit frame according to the present invention.
2 is a perspective view similar to FIG.

[Explanation of symbols]

 (1) Face plate (2) Concave hole

Claims (1)

(57) [Claims] An integrated molded article made of a synthetic resin, wherein a long side has the same size as a short side of a form, and a short side has a rectangular shape having a size equal to an integral number of a long side of the form. The face plate (1) is formed with a flat surface on one side, and formed with a number of hexagonal concave holes (2) in plan view on the other side separated by a partition wall. is a honeycomb structure to be and bottom synthetic resin unit frame for construction formwork is formed rounded in the hexagonal recessed hole (2).