JP2576723B2 - Formwork - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is lightweight and nailable,
The present invention relates to a mold using a foamed synthetic resin as a base material, which is cuttable, retains strength as a mold, and has excellent water resistance and mold release properties.

[0002]

2. Description of the Related Art Conventionally, metal molds and wooden molds have been used as molds used for civil engineering and construction. The former is based on materials such as iron and aluminum and is used in various civil engineering and construction sites. The latter is a plywood formed by polymerizing and bonding thin wooden boards, a so-called control panel. This formwork is also used in civil engineering and construction sites in a large number, like the metal formwork. Since a metal formwork cannot be cut and worked in accordance with the situation at the construction site, various forms are prepared to cope with various works. In addition, in the case of a mold made of a control panel, since it can be appropriately cut with a saw or the like, it is cut in accordance with the situation at the construction site, and connected by nailing or the like. These forms are removed when the work is completed, and the removed forms are used a plurality of times, for example, by being diverted to forms for other works.

[0003]

However, among the metal molds and the control panel molds, the former uses a material having high strength as described above. If it is not possible, it cannot be cut and used according to the construction site, and it can not be nailed, so special fixing brackets are required, and in addition, concrete and the formwork are fixed However, there is a problem that it takes time and effort to release the mold, and if the mold is forcibly released, the mold and the concrete surface are damaged.

[0004] The latter is not as heavy as a metal mold, but is not light enough for an individual to easily carry and work on it, and because of poor releasability, the mold is always used. A release agent must be applied to the concrete casting surface,
In addition, there is a problem that the number of times of use cannot be expected so much, and as a result, the cost becomes high.

In particular, since the increase or decrease in the number of times of use greatly affects the construction cost, it is desirable to use molds that are as durable as possible. For more than the period, the mold is used under adverse conditions exposed to the weather during that period, so rain and dew adhere to the conventional form, and as a result, the metal form However, in the case of a wooden formwork, the durability of the formwork deteriorates remarkably due to the permeation of moisture into the inside and the decay of the wooden formwork, and an increase in the number of uses cannot be achieved.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to provide a plate-shaped core made of a foamed synthetic resin, a hard plate made of a wooden board, a wooden plywood or a synthetic resin plate fixed to both sides of the core, A formwork comprising a release material for a cement-based cured product fixed to the surface of a board, wherein the core material has a foaming degree of 10 to 15
In addition, the reinforcing powder produced by crushing the rice hulls is contained therein, and the inner surface of the hard plate side is a polyethylene sheet, and the outer surface side is a release material of a high-density polyethylene sheet or a polyethylene terephthalate sheet. And a core formed by covering the outer periphery of the hard plate and the release material with a skin layer formed of the core material itself on the outer peripheral surface of the core material, or the core material is foamed. The degree is 10 to 15 times, and the reinforcing powder generated by crushing the rice hull is contained therein,
Further, the outer peripheral surface of the core material is coated with an outer edge portion of the hard plate by a skin layer formed of the core material itself, and after performing a processing process to make unevenness of the hard plate surface even, The problem can be solved by forming a mold in which an ultraviolet curable resin is adhered as a release material to the entire surface including the surface of the hard plate or the skin layer.

[0007]

The formwork according to the present invention has a core made of a foamed synthetic resin obtained by foaming 10 to 15 times, and is made of a wooden board, a wooden plywood or a synthetic resin board on both sides of the core. A hard plate is fixed, and a sheet-shaped release material is fixed to the surface by welding by hot pressing. If this form is used, the core material is a foamed synthetic resin, so it is lightweight and easy to handle. In addition, it can be easily cut with a saw or the like and adapted to each construction site. When assembling the formwork using the formwork in a civil engineering or construction site and casting concrete, hard plates such as plywood are adhered to both surfaces of the core material, so a foam synthetic resin such as a polyurethane resin is used. Even if it is, the supporting strength as a mold can be maintained, and since the reinforcing powder generated by crushing the rice hulls is embedded in this core material, more sufficient mold strength can be obtained. . Then, when the mold is released from the concrete after casting, the release material located on the surface of the core material acts as a release agent, and the mold is easily released from the effect concrete surface. And prevents the release material from permeating the inside of the mold with moisture such as rain and dew from the outside, improves the durability of the mold itself, and enables the mold to be reused repeatedly over a long period of time. Becomes In addition, since the outer periphery of the hard plate and the release material is covered with a skin layer formed of the core material itself on the outer peripheral surface of the core material, the skin layer can reinforce the end portion of the mold. External water can be prevented from entering from this portion, and the nail holding strength at the side end portions can be increased when nailing the formwork.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 shows a basic example of a mold of the present invention, and FIG. 2 shows a mold F1 of the present invention. In FIG. 1, a reinforcing powder 2 generated by crushing rice hulls therein is shown. It is a plate-shaped core made of a foamed synthetic resin that is included therein, and forms a basic constituent material of a mold. As the foamed synthetic resin, one or more kinds selected from synthetic resins such as polyurethane, polystyrene, polypropylene, polyester, polyvinyl chloride, polyphenol, ABS, urea, and melamine are mainly used, and other foamable resins can be used. Synthetic resins can be used. In particular, a polyurethane resin foamed 10 to 15 times in a state where the reinforcing powder 2 generated by crushing rice hulls therein is used therein is preferably used. Reference numerals 3 and 3 'fixed to both surfaces of the foamed synthetic resin plate core 1 are hard plates. As the hard plates 3 and 3 ', a wooden plywood or a wooden board such as a veneer board, or a synthetic resin board is considered, and the first object is to maintain strength as a mold. When used on both surfaces as in F1, the strength as a mold is remarkably improved, and both surfaces of the core material 1 can be used as a concrete casting surface, and the form F1 can be prevented from warping. In this embodiment, the thickness is 1 to 5 mm.
By using a wooden board such as a veneer board, it was thought that the operator would not feel uncomfortable when using it by making it not much different from the conventional instrument panel material visually. In addition, if the formwork itself needs a design in addition to the functional aspect, it is easy to use a material suitable for the building.

Then, a release material shown as 4 in the figure is fixed on the outer surface of the hard plates 3, 3 'fixed to both surfaces. The release material 4 is provided on the surfaces of the hard plates 3 and 3 ', and is used so that when the cement or concrete or the like hardens after curing, it is easily released from the surface of the mold frame F1. The release material 4 has a laminated structure of a high-density polyethylene sheet or a polyethylene terephthalate sheet in which the inner surface of the hard plate 3, 3 'side is a polyethylene sheet, and the outer surface side has good releasability from a cement-based cured product. Yes,
It is bonded to the hard plates 3, 3 'by hot pressing.
According to such a configuration, while the outer surface side in contact with the cement-based hardened material has high hardness, the inner surface, that is, the hard plate 3,
On the 3 ′ side, the melting point is lower than that on the outer surface side.
3 'is firmly adhered to, and a flat surface is secured on the outer surface side without melting. Therefore, both high adhesive strength to the hard plates 3 and 3 ′ and good surface flatness of the cement-based cured product can be achieved. This is because high-density polyethylene generally has a higher melting point and higher hardness than ordinary polyethylene. Adhesion strength is improved by the infiltration of molten polyethylene,
When the hard plates 3 and 3 'are synthetic resin plates, the surface of the synthetic resin and the polyethylene are fused to each other so that they are firmly adhered to each other, and the outer surface side is maintained flat without melting and hardened with cement. This is because a sufficient hardness as a surface for placing the object is maintained.

When such a formwork F1 is used, a concrete filling space is provided in the same manner as a conventionally used aluminum formwork or control panel formwork to form a main formwork F1.
And formwork structures are formed while fixing them with a foam tie or the like. Since the release material 4 is used on both sides of the core material 1, if the release material 4 on one surface is damaged and cannot be used, the surface of the other release material 4 ′ may be used.

More specifically, the mold frames F1 and F2 of the present invention shown in FIGS. 2 to 4 have a skin layer 5 formed of the core material itself on the outer peripheral surface of the foamed synthetic resin plate core 1. The outer edges of the hard plates 3, 3 'and the release members 4, 4' are covered. That is, the formwork F1 represented in FIG. 2 has the reinforcing powder 2 generated by crushing rice hulls therein, and the four sides of the outer peripheral surface have a thickness of, for example, 0.5.
a synthetic resin plate-shaped core material 1 which is a thin skin layer 5 of about 2 mm to 2 mm or a thick skin layer 5 of about several mm in thickness.
And hard plates 3, 3 'fixed to both surfaces of the core material,
This is a mold frame composed of cement-based cured material release materials 4, 4 'fixed to the surfaces of hard plates 3, 3'. That is, the formwork F
1, the outer edge 4 a of the release material 4 is set at substantially the same position as the outer edge of the hard material 3, and the outer edge 4 a of the release material 4 is located inside the outer peripheral edge 1 a of the core 1, 4
The outer edge 4a of the core material 1 is sealed with the outer surface layer 6 of the skin layer 5 at the outer edge of the core material 1, and the surface 7 of the outer surface layer 6 and the surface 8 of the release material are located on substantially the same plane. It is. By providing the skin layer 5, the end of the formwork can be reinforced, and the intrusion of external water from the part can be prevented. Further, when the formwork is nailed or the like, The nail holding strength at the side end portion can be increased. It should be noted that the reinforcing powder 2 may be included in the skin layer 5 to further enhance the reinforcement of the skin layer 5 portion.

The mold F2 shown in FIGS. 3 and 4 has substantially the same structure as the mold F1 described above, in which the release material 4 is a rectangular sheet, and the opposing outer edges 4a of the four sides are the core material. The outer edge 4 of the release material 4 is located inside the outer
a is the outer surface layer 6 of the skin layer 5 at the outer edge of the core material 1
It is what was sealed with. That is, the core 1, the release material 4, and the reinforcing powder 2 are used in the same manner as in the embodiment of FIG. 2, and the outer edge 1 a of the core 1 protrudes outward from the outer edge 4 a of the release material 4. Is provided.

The details will be better understood with reference to the partially enlarged sectional view of FIG. In other words, the formwork F2 is formed by extending the outer surface layer 6 of the skin layer 5 of FIG. 2 to the surface 8 of the release material, and covering the entire outer edge 4a of the release material 4 with the covering portion 9. . In a state where such a skin layer 5 is projected outward from the release material 4, further, in this state, the outer surface layer 6
In the case where the entire periphery of the release material is covered with a coating portion 9 extending onto the release material 4, the periphery of the release material 4 is prevented from peeling from the surface of the core material 1, and the outer surface layer portion 6 Moisture and cement components at the time of use of the mold are prevented from entering the bonded portion between the release material 4 and the core material 1 from the side end of the release material 4 into the core material and the bonded portion. In addition, this skin layer 5
Is used as a reinforcing frame material for the mold F2 to give the mold an extremely high strength and to make nailing good.

FIGS. 5 and 6 show examples of the release material 4 in which an ultraviolet curing resin 10 is adhered to the surface or the entire surface of the hard plate 3. That is, the formwork F3 represented in FIG. 5 includes a foamed synthetic resin plate-shaped core 1 in which reinforcing powder 2 generated by crushing rice hulls is embedded, and both surfaces of the core 1. It comprises a hard plate 3, 3 'made of a fixed wooden board, a wooden plywood or a synthetic resin board, and a release material 4 having an ultraviolet curing resin 10 adhered to the entire surface. More specifically, in the present form F3, the core material 1 has a foaming degree of 10 to 15 times, and the skin layer 5 formed on the outer peripheral surface of the core material 1 by the core material itself. 3 and 3 ', while covering the outer edges of the hard plate 3,
After performing a processing process to make the 3 ′ surface uneven, the ultraviolet curable resin 10 as the release material 4 is adhered to the entire surface including the skin layer 5.

The form F3 is formed of the form F shown in FIGS.
1, F2 and the basic parts, that is, the core material 1 and the hard plate 3, the core material 1 and the skin layer 5, etc. are the same, but the release material 4 is fixed to a sheet or film. On the other hand, in the case of this example,
Even if the surface of the core material 1 and the surface of the hard plate 3 are rough, the UV curable resin 10 adheres evenly to the uneven portions and is firmly fixed. Since they are formed in a flush state, they have excellent release properties.

The mold F4 shown in FIG. 6 has substantially the same structure as the mold F3 described above, but the outer edges of the hard plates 3, 3 'fixed to both surfaces of the core material 1 are shown in FIG. In the same manner as shown, the outer surface layer 6 of the skin layer 5 of the core material 1 is covered with a coating 9 formed by extending to the surface of the hard plate 3, 3 ′.
The release material 4 made of the ultraviolet curable resin 10 is adhered to the entire surface including.

In the case where the surfaces of the hard plates 3 and 3 'in the molds F3 and F4 are extremely rough, a film is formed on the surfaces of the hard plates 3 and 3' in order to make the surface unevenness in advance. Timber,
After performing processing to eliminate surface irregularities by bonding a thin material such as a sheet material, the ultraviolet curable resin 10 is adhered to the entire surface.

[0018]

As described above, the formwork according to the present invention has a low cost, a long life, a light weight, excellent workability, a saving of forest resources,
Various effects described above can be satisfied at a high level, and specifically, the following many excellent effects are exhibited. (1) Since a foamed synthetic resin plate-shaped core material is used inside, the whole can be reduced in weight, and when reinforcing powder is contained inside the core material, the core material itself is used. It is also possible to have strength.

(2) In particular, the structure in which the foaming degree of the core material is 10 to 15 times and the reinforcing powder is contained therein is excellent in the familiarity between the foamed synthetic resin and the reinforcing powder, and is lightweight. In spite of this, it exhibits high strength, excellent nailing performance and nail preventing effect, and excellent cutting performance by sawing. This easy cutting property is further improved because powder produced by grinding rice hulls is used as the reinforcing powder.
Here, if the degree of foaming falls below this range, the handleability due to weight increase decreases, and if the degree of foaming exceeds this range, the porosity increases and the familiarity with the reinforcing powder deteriorates, and the function of preventing the nail from coming off decreases. The above range ensures high performance as a mold.

(3) A structure in which a release material such as a polyethylene sheet is used for the inner surface of the hard plate and a high-density polyethylene sheet or polyethylene terephthalate sheet is used for the outer surface is bonded to the hard plate by hot pressing. The contact surface is excellent in abrasion resistance and flatness, and the inner surface, that is, the hard plate side, is firmly adhered to the hard plate by melting of polyethylene, so it does not peel off easily enough for repeated specifications It is a very reliable release material that can withstand. In addition, this release material does not prevent easy cutting of the formwork.

(4) With this strength, the hard plate fixed to both sides of the core material can provide a certain strength as a formwork, prevent the formwork from warping, It can also be used as a release surface. In addition to this, the bending strength of the entire formwork is high, and in addition to enabling nailing, it can be easily cut with a saw or the like even if the strength as the formwork is maintained. With release material,
A high mold release effect on a cement-based cured product can be exhibited.

(5) In particular, a skin layer portion made of the core material itself is formed around the foamed synthetic resin plate-like core material,
When using a high-density polyethylene sheet or a polyethylene terephthalate sheet as the release material, the outer edge of the hard material and the release material, since the outer peripheral portion of the hard material is coated with the skin layer when using an ultraviolet curable resin as the release material, At the same time as the skin layer portion forms a reinforcing frame body for the mold, it exhibits a nail retaining function, and not only creates an appropriate use state as a mold, but also adheres to the inside of the hard material and to the bonding surface with the core material. The penetration of water and water containing a cement component is efficiently prevented, and the release material is prevented from peeling off.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view for explaining a mold of a first embodiment according to the present invention.

FIG. 2 is an explanatory perspective view showing a part of the formwork of the first embodiment according to the present invention in section;

FIG. 3 is an explanatory perspective view in which a part of a mold of a second embodiment according to the present invention is sectioned;

FIG. 4 is an explanatory cross-sectional view in which a part of FIG. 3 is enlarged;

FIG. 5 is an explanatory perspective view in which a part of a mold according to a third embodiment of the present invention is cross-sectioned;

FIG. 6 is an explanatory perspective view in which a part of a mold according to a fourth embodiment of the present invention is cross-sectionally shown;

[Explanation of symbols]

 Reference Signs List 1 core material 1a core material outer edge 2 reinforcing powder 3 hard plate 4 release material 4a release material outer edge 5 skin layer 6 outer surface layer part 7 outer surface layer part surface 8 release material surface 9 coating part 10 ultraviolet curing resin F1 first Example form F2 Example 2 form F3 Example 3 form F4 Example 4 form

Claims (2)

(57) [Claims] 1. A foamed synthetic resin plate-shaped core material, a hard plate made of a wooden board or a wooden plywood or a synthetic resin plate fixed to both surfaces of the core material, and a cement-based hardening fixed to the surface of the hard plate A mold comprising a material release material, wherein the core material has a foaming degree of 10 to 15 times, and a reinforcing powder generated by crushing rice hulls is contained therein,
Further, a release material such as a polyethylene sheet on the inner side of the hard plate and a high-density polyethylene sheet or polyethylene terephthalate sheet on the outer surface is bonded to the hard plate by hot pressing, and is formed of the core material itself on the outer peripheral surface of the core material. A mold, wherein the outer edges of the hard plate and the release material are covered with the skin layer thus formed. 2. A foamed synthetic resin plate-like core material, a hard plate made of a wooden board, a wooden plywood or a synthetic resin plate fixed to both surfaces of the core material, and a cement-based hardening fixed to the surface of the hard plate A mold comprising a material release material, wherein the core material has a foaming degree of 10 to 15 times, and a reinforcing powder generated by crushing rice hulls is contained therein,
Further, the outer peripheral surface of the core material is coated with an outer edge portion of the hard plate by a skin layer formed of the core material itself, and after performing a processing process to make unevenness of the hard plate surface even, A mold form, characterized in that an ultraviolet curable resin is adhered as a release material to the entire surface including the surface of the hard plate or the skin layer.