JPH116287A - Concrete form made of synthetic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete form made of a synthetic resin, which is light in weight and high in rigidity and which has the property of transmitting light rays. SOLUTION: A concrete form 2 includes a base part 4, a pair of first edge parts 6, a pair of second edge parts 8, and a plurality of beam parts 10, and is molded from a recyclable thermoplastic resin. The base part 4 is in the form of a rectangular flat plate, and a flat concrete construction face 402 is formed on the front of the base part 4. The beam parts 10 are provided by two and extend parallel to the first edge parts 6 at intervals along the extending direction of the second edge parts 8 on the back of the base part 4 to connect the second edge parts 8, and the part 410 of the base where no beam part 10 is provided has the property of transmitting light rays.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin concrete formwork used for construction and civil engineering work.

[0002]

2. Description of the Related Art Conventionally, during concrete construction accompanying construction or civil engineering work, a concrete form in which a plywood is struck on the back side of a plywood, which is a so-called slab, has been used. However, since these plywood forms are made from forest resources such as rawan, coniferous trees, etc., there is a concern that global natural resources will be depleted. Is being considered. In general, in the field of construction and civil engineering, the formwork work before concrete casting is dependent on human labor, so it is light as much as possible in consideration of transportation work and processing work, and workability such as nailing and cutting. Good things are required. Under such circumstances, it is a recyclable material that replaces conventional plywood, lightweight,
Various types of concrete forms using synthetic resin have been proposed and put into practical use from metal and various kinds of waste materials as having good workability. For example, a synthetic resin concrete formwork corresponding to a weir board is disclosed in JP-A-6-155433, JP-A-7-25144, JP-A-7-150763, JP-A-7-173328, and JP-A-7-217195. ,
As disclosed in JP-A-8-93217 and JP-A-8-100523, composite panels in which various synthetic resin sheets, films, etc. are referred to as foams, foamed sheets and the like, and JP-A-6-66021, JP-A-7-108858,
Japanese Patent Application Laid-Open No. H08-207190 discloses a resin-made concrete panel in which a grid-like hollow panel, a weir, and a backboard are integrated by an extrusion method as disclosed in JP-A-8-207190.
Japanese Patent Application Laid-Open Nos. 129094, 6-307075, 7-11766, and the like have proposed rib-integrated formwork panels by an injection compression molding method. Here, the panel indicates that the concrete construction surface of the synthetic resin form has a flat plate shape, and the rib indicates the reinforcing structure integrally provided on the back side of the construction surface. Of these synthetic resin concrete forms, the former composite panels and lattice-like hollow panels equivalent to the weir board have been practically used in part because of their light weight, high rigidity, high strength, and good nailing. Is 12 mm in accordance with the formwork plywood, so that there is no light transmission, and the concrete filling state cannot be grasped when casting concrete, and unfilled portions are likely to occur, which is not preferable. In addition, it is necessary to back the composite panel or lattice-shaped hollow panel with a square bar when performing construction that requires a sash, and there is a problem in the recyclability due to the separation of materials and the joining of different resins when disposing of the formwork. Was. On the other hand, the latter rib-integrated formwork panel is made of a single resin material by an injection compression molding method or an injection molding method, so that the panel thickness of the construction surface is about 5 mm, and it is lightweight and good for nailing. However, the rigidity is insufficient at the dimensions of 2 × 6 length (600 × 1800 mm) and 3 × 6 length (900 × 1800 mm), which are the dimensions of the general formwork plywood, and the center of the panel in the longitudinal direction is deformed at the time of placing concrete. In many cases, it was necessary to increase the width of the thicker timber on the rear side of the form panel. For this reason, glass fibers, talc, synthetic resin materials with high rigidity to which various fillers are added, or by increasing the number of ribs or increasing the number of ribs on the back side in terms of shape, The weight is heavy and the workability is reduced, and the addition of inorganic filler to the material increases the affinity with concrete, making it easier for concrete to adhere to the synthetic resin form during demolding, and the surface of the release agent There were many problems, such as the necessity of application to the surface. In order to solve such a problem of the rib-integrated form panel, Japanese Patent Application Laid-Open
A method of systematizing the construction method while attaching the back surface as shown in No. 158638 has recently been proposed, but the problem of using a new construction system and conventional plywood together has not been solved. Therefore, there has been a demand for a synthetic resin concrete formwork that solves these problems, is lightweight, has high rigidity, has excellent workability, and can be recycled at the time of disposal.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a concrete form made of a synthetic resin having light weight, high rigidity, and light transmittance, instead of a concrete form made of plywood.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a rectangular flat plate-shaped substrate part having a front surface forming a concrete construction surface, and a pair of opposite pairs of sides on the back surface of the substrate part. A pair of first edges each erected from one of the paired sides, and a pair of second edges erected from the other pair of the two pairs of sides, A plurality of spacers are provided on the back surface of the substrate portion, spaced apart from each other in the direction in which the second edge extends, and extend in parallel with the first edge at an interval from the first edge and connect the second edges. And a girder portion, wherein the girder portion is
A pair of side plates that stand parallel to the first edge at an interval from the back surface of the substrate and extend in the direction in which the second edge extends, and a bottom plate that connects between the tips of the pair of side plates. Is formed in a hollow shape, and a portion of the substrate portion surrounded by the pair of first edge portions and the pair of second edge portions, on which the girder portion is not located, is cast on the concrete working surface. Is characterized in that it has a light transmittance such that the filled state can be visually recognized.

Further, the present invention is characterized in that a rib for connecting between the back surface of the substrate portion and the bottom plate portion is provided inside the beam portion. Further, in the present invention, the rib,
It is characterized by comprising a plurality of plate pieces extending in parallel with the side plate portion at an interval from the side plate portion and connecting between the back surface of the substrate portion and the bottom plate portion. Further, the present invention is characterized in that the ribs are constituted by a plurality of honeycomb-shaped plate pieces connecting between the back surface of the substrate portion and the bottom plate portion. Further, the present invention is characterized in that the synthetic resin concrete form is molded from a recyclable thermoplastic resin containing no fibrous filler. Further, the present invention is characterized in that the thermoplastic resin is used after being foamed. Also, in the present invention, the substrate portion may have a rectangular shape, the first edge portion may be erected from a long side of the rectangular shape,
The edge is erected from the short side of the rectangle, and the portion facing the first edge in the substrate portion where the spar is not located can accommodate a connecting tool for connecting the formwork and a connecting operation. The portion located between the spar portions in the substrate portion where the spar portion is not located is formed in a size that can accommodate the separator and enable the interconnecting work of the molds by the separator. It is characterized by having.

[0006]

Embodiments of the present invention will be described below. FIG. 1 is a perspective view of a synthetic resin concrete formwork according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line A of FIG. The concrete form 2 made of synthetic resin includes a substrate portion (corresponding to a panel of a conventional concrete form) 4, a pair of first edges 6, a pair of second edges 8, and a plurality of spar portions 10.
And is molded from a recyclable thermoplastic resin.

The substrate 4 has a rectangular, flat plate shape. The front of the substrate 4 is formed on a concrete working surface 402 on which concrete is poured, and the concrete working surface is formed as a flat surface. The pair of first edges 6 are respectively erected from one pair of sides (long sides) of the two pairs of opposite sides of the back surface 404 of the substrate portion 4, and the second edges 8 are formed.
Are respectively erected from the other pair (short side) of the two pairs of sides.

[0008] The two beam portions 10 are provided, and each beam portion 10 is provided.
Extends parallel to the first edge 6 at intervals in the direction in which the second edge 8 extends on the back surface 404 of the substrate portion 4 and connects the second edge 8 to each other. The girder portion 10 includes a pair of side plate portions 1002 that stand up from the back surface 404 of the substrate portion 4 in parallel with the first edge portion 6 at intervals in the extending direction of the second edge portion 8, and a pair of side plate portions 1002. And the bottom plate portion 1004 connecting the front ends of the bottom plate portion 1004, the inner surface is formed in a hollow shape, and the outer surface of the bottom plate portion 1004, the front end surface of the first edge portion 6, and the front end surface of the second edge portion 8 are located on the same plane. It is formed as follows.

The pair of first edges 6 and the pair of second edges 8
The substrate portion 410 in which the girder portion 10 is not located in the substrate portion 4 portion surrounded by
In this embodiment, the substrate portion 410 is formed at both ends in the extending direction of the second edge 8 and the central portion. Three are provided. Since the synthetic resin concrete form 2 is made by an injection compression molding method or an injection molding method using a single synthetic resin material, the substrate portion 4
The resin material to be used is determined in consideration of the thickness of the substrate portion 4 so that the material 10 has light transmittance enough to visually confirm the filling state of the concrete.

The dimensions of the substrate section 4 are not particularly limited, but are generally 2 × 6 (600 × 1800 mm) and 3 × 6 (9
00 × 1800 mm), which is the same as the size of the formwork centered on plywood, which has been conventionally used, and its thickness is 2 m.
m or more and 10 mm or less is preferable. When a molded article having the above dimensions is produced using a thermoplastic resin, it can be generally produced by an injection molding method or an injection compression molding method, but its thickness is important. That is, the thickness of the construction surface is 2.
If it is 0 mm or less, the rigidity is insufficient, and even if the girder portions 10 are provided on the back surface 404, the space between the girder portions 10 cannot withstand the concrete placing pressure and is deformed. If a large number of rib structures are provided for reinforcement in order to solve this problem, the weight of the molded product increases, which is not preferable. On the other hand, if the thickness is 10.0 mm or more, although rigidity can be ensured, not only is the weight of the molded article significantly increased, but also a so-called sink mark, which is accompanied by a shrinkage rate specific to the molding of a thick thermoplastic resin. Uneven surfaces appear on the surface of the molded product, which is not preferable. Therefore, the thickness of the substrate portion 4 is preferably 2.0 mm or more and 10.0 mm or less, and more preferably 3.0 mm or more and 5.0 mm or less.

The first edge portion 6 and the second edge portion 8 are used for joining with adjacent molds, and the thickness thereof is preferably 2.0 mm or more and 10.0 mm or less, and the height thereof is 12.0 mm or more 10 from concrete construction surface 402
0.0 mm or less is preferable. If the thickness is 2.0 mm or less, it is weak to tighten the joining jigs with the adjacent molds, and the fixed part is easily damaged. If the thickness is 10.0 mm or more, the irregularities due to the shrinkage of the resin cause A wavy shape is generated, which is not preferable. It is recommended that the height be 12.0 mm or more and 100.0 mm or less from the concrete construction surface 402. Height is 1 from concrete construction surface 402
When the thickness is 2.0 mm or less, the thickness of the mold by the conventional plywood is 1
When the concrete form 2 of the present invention is used in combination with a conventional plywood, it is necessary to supplement a shortage from the back surface 404 side in order to flatten the construction surface. Absent. Further, when the height is 100.0 mm or more from the concrete construction surface 402, the conventional formwork height of 50.0 to 10 for domestic plywood forms with shallow wood according to domestic regions.
It is more than 0.0 mm, and it is not preferable to use these together. Therefore, the concrete construction surface 402
The thickness of the first edge portion 6 and the second edge portion 8 provided around the back side of the steel is preferably 2.0 mm or more and 10.0 mm or less, and the height thereof is 12.0 mm or more and 100.0 mm or less from the concrete construction surface 402. Is preferred. The first edge 6 and the second edge 8 are provided with a bolt hole for joining and fixing the concrete formwork 2 side by side, a partially uneven shape for attaching various fixing jigs, and a through hole 420 as necessary. Can be provided.

The spar 10 is for securing the rigidity of the concrete formwork 2. The practical rigidity of the formwork is 400 mm in the longitudinal direction, between the thick fulcrums when concrete is cast, and the center. A deflection of 3.0 mm or less is required at a partial maximum load of 3 to 5 t / m ² . In order to satisfy such a demand with a thermoplastic resin molded product, conventionally, a simple rib is arranged on the back side of the concrete construction surface 402 and the rib width is increased or the number of ribs is increased. However, the weight of the mold increases, which is not preferable. Therefore, in the concrete form 2 of the present invention, the pair of first edge portions 6
In order to prevent the inner portion surrounded by the second edge 8 from being hollowed, a predetermined width of a central portion of the mold back surface 404 corresponding to the separator attaching portion and a predetermined width inside the edge for joining the adjacent form are removed. A girder portion 10 having a hollow inside is provided on the entire back surface 404 to secure rigidity while reducing the weight of a mold using a thermoplastic resin. That is, as shown in FIG. 2, the cross section of the girder portion 10 is made into a square hollow shape, or the cross section of the girder portion 10 is made into a comb shape as shown in FIG. And may be provided so as to penetrate in the longitudinal direction. Also, as shown in FIG.
0, a rib is provided in a lattice pattern, or as shown in FIG. 5, a rib is provided in a honeycomb structure, and a bottom plate 1004 which is integrated with the rib with the same material is provided so as to cover only that portion. Is also good. Here, the girder portion 10 to be hollowed out
Is required to be the same as the height of the first edge portion 6 and the second edge portion 8 provided on the outer peripheral portion of the mold back surface 404, and 12.0 mm or more and 100.0 mm or less from the construction surface. Recommended. If the height of the girder part 10 is higher than the first edge part 6 and the second edge part 8, the reinforcing end thick material will support the girder part 10, and the first edge part 6, the second edge part 8, and the girder part 10 is not integrated, and a step is likely to be formed between adjacent molds, which is not preferable. If the height of the girder part 10 is 12.0 mm or less, the first edge part 6
And lower than the second edge 8, and the first side
Only the edge 6 and the second edge 8 are present, and the beam 10 is in a floating state. For this reason, the concrete placing pressure is received only at the first edge 6 and the second edge 8, which tends to cause deformation, which is not preferable. Therefore, the height of the girder part 10 is the same as the first edge part 6 and the second edge part 8 and the concrete
From 2 it is preferably 12.0 mm or more and 100.0 mm or less. The number and width of the girder portions 10 are not particularly limited as long as they can be installed at portions other than the predetermined width of the separator mounting portion and the predetermined width for joining inside the first edge portion 6 and the second edge portion 8. , The width of the girder part 10 is 75.0 mm or more and 16
About 0.0mm or less, it is recommended that a plurality be provided symmetrically from the center in both the short and longitudinal directions of the formwork. Regarding the width, in the case of a general formwork 2 × 6 scale and 3 × 6 measure, the part excluding the above-mentioned predetermined width corresponds to this, and from the balance on the formwork structure, it is possible to provide a plurality of girder parts 10. Recommended. The thickness of the girder part 10, that is, the side plate part 100
The thickness of the bottom plate portion 2 and the thickness of the bottom plate portion 1004 are related to the molding method using a thermoplastic resin, but generally, 1.5 mm or more and 5.0 mm or less are recommended. When the wall thickness is 1.5 mm or less, it is difficult to fill the thermoplastic resin into the mold to the end, and it is easy to form a defective molded product having an unshaped portion called a so-called short shot. In the above, molding is facilitated, but the weight of the entire mold is increased, which is not preferable. Therefore, the thickness of the side plate portion 1002 and the bottom plate portion 1004 constituting the girder portion 10 is preferably 1.5 mm or more and 5.0 mm or less, and actually, 2.0 mm or more and 3.0 mm or less.

The pair of first edges 6 and the pair of second edges 8
The substrate portion 410 in which the girder portion 10 is not positioned in 4 minutes of the substrate portion surrounded by is only the thickness from 2.0 mm to 10.0 mm from the concrete construction surface 402, and the material composition of the thermoplastic resin described later In addition, since it has light transmittance, it is possible to work by light from outside even in the building after the formwork is constructed, and it is possible to grasp the concrete filling state through this part at the time of placing concrete. For this reason, it is possible to prevent in advance the unconcrete filling holes and the like that are found after the mold is removed from the conventional mold, and it is possible to significantly improve the working efficiency. Here, the predetermined width corresponding to the separator mounting portion means that the first edge portion 6 having a width of about 80.0 mm to 150.0 mm in the center portion of the second edge portion 8 (short direction of the mold) (in the longitudinal direction of the mold). ) Is a non-reinforced portion of the concrete construction surface 402 provided in parallel with the above. The non-reinforcement portion may include a concrete construction surface 402 if necessary.
It is possible to provide a mark for position confirmation at the time of attaching the separator, a simple annular rib, or the like to such an extent that the transmission of light from the light source is not hindered. Due to the presence of this portion, at the time of forming the formwork, the work of fixing the separator connecting the formwork through the concrete formwork 2 can be easily performed. The predetermined width for joining inside the first edge portion 6 and the second edge portion 8 means that when joining the adjacent concrete forms 2, bolts are penetrated to the mutual edges and fixed, or a simple jig is used. It is a non-reinforcing portion for facilitating the work for fixing by fixing, and it is recommended to provide a width of about 100.0 mm to 150.0 mm inside the first edge portion 6. The non-reinforcement portion may include a concrete construction surface 402 if necessary.
It is also possible to attach a narrow rib or an extremely shallow grid-like rib connecting the first edge portion 6 and the spar portion 10 at several places so as not to impede the transmission of the light beam from the outside. Since this portion is also composed only of the concrete construction surface 402, it has light transmittance, and the same effect as the separator mounting portion can be expected.

As the synthetic resin material used for the concrete formwork 2 of the present invention, a recyclable thermoplastic resin containing no fibrous filler is suitable. Here, the fibrous filler refers to a filler having a length of mm unit or more irrespective of the type of natural product or artificial product in addition to glass fiber and carbon fiber. Therefore, generally used needle-like whiskers and plate-like fillers are not included. As the thermoplastic resin used in the present invention, polyethylene, polypropylene, other olefin-based resins, polystyrene, AS resin, ABS resin, other styrene-based resins, vinyl chloride resin, and other general-purpose thermoplastic resins, and polyamide, polycarbonate , PBT resin, PET resin, and other engineering plastics. In addition, those obtained by blending various rubber components or plasticizers, flame retardants, release agents, antistatic agents, and other various additives are also included. Further, a so-called polymer alloy in which these resins are directly blended or mixed via an appropriate compatibilizer is also included. Generally, when molding a mold using a thermoplastic resin, the rigidity of the molded product is often modified without modifying the shape due to the lack of rigidity.
The rigidity is improved by blending fibrous fillers such as glass fiber and carbon fiber in the resin. However, such fibrous fillers are also scattered on the surface of the molded product, and at the time of concrete construction, they are chemically compatible with or physically bonded to concrete, and prevent demolding after solidification of concrete, It is not preferable because the concrete construction surface 402 after demolding is also roughened. In addition, when the thermoplastic resin containing fibrous filler is re-melted and re-pelletized and used as a recycled material, the impurities attached during use and these fibers are complicatedly related, and the screws, barrels and dies in the extruder are significantly reduced. It is not preferable because it causes wear and increases the maintenance frequency of the apparatus. Therefore, as the resin for concrete formwork of the present invention, the above-mentioned general-purpose thermoplastic resins and engineering plastics which do not contain a fibrous filler are preferable.
P polystyrene, AS resin, MS resin, PMMA resin,
Polycarbonate and other transparent resins are recommended. In particular, by using these transparent thermoplastic resins, not only the light transmittance but also the filling state of the contents at the time of placing concrete can be seen with the naked eye. Can be prevented.

Although there is no particular limitation on the production of the resin concrete form 2 of the present invention, it can be generally produced by an injection molding method or an injection compression molding method.
That is, a core moving mechanism may be provided in a mold, and the girder portion 10 may be integrally formed at the time of injection molding or injection compression molding. Alternatively, the girder portion 10 may be formed by gas injection molding using nitrogen gas or the like.
Can be integrally formed. Also, the bottom plate 100
4 is formed integrally with the substrate 4 and the first edge 6 and the second edge 8, and the bottom plate 100 is formed by post-processing.
The girder portion 10 may be formed by adhering and integrating only 4 with the same resin sheet and a plate-shaped molded product of the same resin. Furthermore, at the time of manufacturing the concrete form 2 of the present invention, a chemical foaming agent is blended with a thermoplastic resin as a material, or the inside of the molded product is finely fired using a resin impregnated with a gas to further enhance the molded product itself. It is also possible to improve the workability such as saw cutting property, nailing easiness, etc. at the same time as reducing the weight.

[0016]

As is apparent from the above description, the synthetic resin concrete formwork of the present invention has a rectangular flat plate-shaped base part having a front surface forming a concrete construction surface, and two opposing back surfaces of the base part. A pair of first edge portions respectively erected from one pair of sides of the pair of sides, and a pair of first edges respectively erected from the other pair of the two pairs of sides. A second edge and a second edge extending parallel to the first edge at an interval from the first edge at an interval in a direction in which the second edge extends on a back surface of the substrate portion; A plurality of spar portions connecting the portions, wherein the spar portions are spaced from the back surface of the substrate portion in the direction in which the second edge extends and stand in parallel with the first edge. And a bottom plate portion connecting the tips of the pair of side plate portions, the inside of which is formed in a hollow shape, and the pair of first edge portions and the pair of second edge portions Substrate portion of the girder in Murrell substrate portion is not located was configured to have an optical transparency to the extent that filling state of the concrete to be Da設 to the concrete construction surface is visible. Therefore, it has almost the same light weight and high rigidity as the conventional plywood formwork with the same construction area, and also has light transmittance, significantly improving the work efficiency at the concrete construction site and usefully Can be used. Also, after dozens of conversions, the form of the present invention can be re-melted and repelletized to be used as a recycled material, and the use of wood for plywood can be prevented, thus protecting forest resources. Can contribute to

[Brief description of the drawings]

FIG. 1 is a perspective view of a synthetic resin concrete formwork.

FIG. 2 is an explanatory view of a girder part of a synthetic resin concrete formwork.

FIG. 3 is an explanatory view of a girder portion of a synthetic resin concrete formwork.

FIG. 4 is an explanatory view of another method of manufacturing a synthetic resin concrete formwork.

FIG. 5 is an explanatory view of another method of manufacturing a synthetic resin concrete formwork.

[Explanation of symbols]

 2 Concrete formwork 4 Substrate 6 First edge 8 Second edge 10 Girder

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Setsu Shirai 3-2-5 Kasumigaseki, Chiyoda-ku, Tokyo Mitsui Toatsu Chemicals, Inc.

Claims (7)

[Claims] 1. A rectangular flat plate-shaped substrate part having a front surface serving as a concrete construction surface, and a pair of upright members each standing from one of a pair of two opposite sides of a back surface of the substrate part. A first edge portion, a pair of second edge portions respectively erected from the other pair of the two pairs of sides, and an extension of the second edge portion on the back surface of the substrate portion A plurality of girders extending in parallel with the first edge at intervals in the direction and extending in parallel with the first edge at intervals and connecting the second edges. The interior is hollow with a pair of side plate portions standing upright in parallel with the first edge portion at an interval in the extending direction of the second edge portion from the back surface of the pair, and a bottom plate portion connecting the tips of the pair of side plate portions. The substrate portion, which is formed in a shape and is surrounded by the pair of first edge portions and the pair of second edge portions, where the beam portion is not located, Ried filling state of the concrete to be Da設 the construction surface having optical transparency to the extent that is visible, synthetic resin concrete form, characterized in that. 2. The synthetic resin concrete formwork according to claim 1, wherein a rib for connecting between the back surface of the substrate portion and the bottom plate portion is provided inside the girder portion. 3. The rib is formed of a plurality of plate pieces extending in parallel with the side plate portion at an interval from the side plate portion and connecting between the back surface of the substrate portion and the bottom plate portion. Item 3. A synthetic resin concrete formwork according to item 2. 4. The synthetic resin concrete formwork according to claim 2, wherein the rib is constituted by a plurality of honeycomb-shaped plate pieces connecting between the back surface of the substrate portion and the bottom plate portion. 5. The synthetic resin concrete form according to claim 1, wherein the synthetic resin form is molded from a recyclable thermoplastic resin containing no fibrous filler. 6. The concrete form made of synthetic resin according to claim 5, wherein said thermoplastic resin is used by being foamed. 7. The substrate portion has a rectangular shape, the first edge portion is erected from a longer side of the rectangle, the second edge portion is erected from a shorter side of the rectangle, and the girder portion is positioned. The portion of the unexposed substrate portion facing the first edge is formed in a size that can accommodate a coupling tool for coupling the molds and can perform the coupling operation, and the substrate portion where the girder portion is not located. 7. The portion of the portion located between the beam portions is formed in such a size that the separator can be accommodated and the formwork can be interconnected by the separator.
The concrete form made of the synthetic resin described in the above.