JPH11182030A - Resin concrete casting formwork - Google Patents

Abstract

(57) [Abstract] (Modified) [Problem] A concrete casting mold with ribs that can be easily peeled from a concrete casting surface during disassembly and that the applied mortar does not easily peel off even when mortar is applied. I will provide a. A ribbed resin concrete casting formwork 10 composed of a weir board 1 and ribs 2, 3 represents the roughness of the weir board surface as the maximum roughness measured by a surface roughness meter. The rib-forming resin casting concrete form 10 having a thickness of 10 μm or more and 150 μm or less.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ribbed resin concrete casting form in which reinforcing plate-like ribs are provided on the entire periphery of a weir plate and on the back surface of the weir plate.

[0002]

2. Description of the Related Art A concrete casting formwork is used for placing concrete in civil engineering works, construction sites, and the like. Various types of materials such as wooden and metal are known as the material of the concrete casting formwork. The above-mentioned wooden formwork deteriorates in surface condition during repeated use, and can be used only for a few times, or there is a strong demand for replacement of wooden products due to recent global environmental problems. In addition, there is a problem that the metal formwork is rusted so that the storage property is not good, and that the metal formwork is not easy to handle.

[0003] In order to solve such a problem, in recent years, a concrete casting formwork made of resin has been developed and put into practical use and widely used.

A conventional resin concrete casting mold is disclosed in, for example, Japanese Patent Application Laid-Open No. 6-129094. As shown in FIG. 1, this type of concrete casting mold made of resin is usually referred to as a slab 1 corresponding to a plywood of a wooden concrete casting mold (hereinafter, referred to as a "plywood mold"). It is composed of a flat plate portion and a plurality of plate-like ribs 2, 3, 4 that are parallel to the entire outer periphery of the weir plate 1 and the vertical and / or horizontal sides of the weir plate 1 and connect both ends.

[0005] The resin-molded concrete formwork 10 with ribs is lightweight and can withstand many conversions. In addition, since the plate-like ribs correspond to the wooden trusses of the concrete-formation formwork, the construction of the concrete formwork 10 can be improved. There is no need to hit a pier at the site,
It has many advantages not found in wooden or metal concrete casting forms, such as being very efficient.

[0006]

However, when comparing the surface roughness of such a resin concrete casting mold and the surface of a plywood form, the former has a smaller surface roughness than the latter, and therefore has a lower resin roughness. When a concrete casting mold is used, since the concrete casting surface is finished to a smooth surface, there is a problem that the mortar comes off when the mortar is applied to the concrete surface after construction. Also, for example, a resin concrete casting mold having a large surface roughness is obtained in a resin concrete casting mold using a stamping sheet as a material, but conversely, the surface roughness is too large. After casting, there has been a problem that it is difficult to peel off the mold from the casting surface when dismantling the mold.

[0007]

SUMMARY OF THE INVENTION In view of the above, the present inventors have solved the above-mentioned problems, and can easily peel off the concrete casting surface during dismantling and apply the mortar even if the mortar is applied. As a result of studying the development of a resin concrete casting formwork with ribs, which is less likely to peel, the present invention has been achieved.

That is, according to the present invention, the surface roughness of a crevice plate is represented by the maximum roughness measured by a surface roughness meter in a resin concrete casting formwork having ribs and a rib. An object of the present invention is to provide a concrete casting formwork made of resin with ribs, which is not less than 10 μm and not more than 150 μm.

Hereinafter, the contents of the present invention will be described in detail. As shown in FIG. 1, a concrete casting mold with ribs according to the present invention comprises a weir plate 1 and plate-like ribs 2 on the entire outer periphery of the weir plate 1.
(Sometimes referred to as an outer peripheral rib) and a plurality of reinforcing plate-like ribs 3 and 4 which are parallel to the longitudinal / lateral sides of the weir plate 1 and connect both ends.

The reinforcing plate-like ribs 3 may be provided in parallel with the vertical side which is the length direction of the weir plate 1, and the plate-like ribs 4 may be provided in the lateral direction which is the width direction of the weir plate 1. It may be provided, and it is preferable that both plate-shaped ribs 3 and 4 are provided from the viewpoint of improving strength. Although the plate-like ribs 3 and 4 do not need to be provided in parallel with the outer peripheral rib, it is preferable that both plate-like ribs are parallel to the outer peripheral rib from the viewpoint of strength.

When the plate-like ribs 3 and 4 are provided, a plurality of the plate-like ribs are usually provided in each direction or both directions, but the number is arbitrary and is appropriately selected according to a desired strength as a mold.

Further, as shown in FIG. 1, the resin concrete casting mold 10 of the present invention has a structure having a clip hole for connection in an outer peripheral rib. The auxiliary ribs may be provided in the direction parallel to the outer peripheral ribs.

Further, the baffle plate 1, the outer periphery and the plate-like ribs 2, 3, 4 may be integrally formed of the same material, or the baffle plate 1 and the plate-like ribs 2, 3, 4 may be integrally formed.
May be formed separately, and the two may be joined by an adhesive or subsequent welding, but it is preferable that they are integrally formed from the viewpoint of strength.

In the present invention, the thickness of the weir plate 1 depends on the material of which it is made, but when it is made of a thermoplastic resin, it is usually preferably 2 mm or more from the viewpoint of mechanical strength. It is preferably 10 mm or less from the viewpoint of properties.

The total dimension of the height of the outer peripheral rib 2 and the thickness of the weir board 1 is preferably 55 to 75 mm from the viewpoint of compatibility with a conventionally used plywood form. For example, the total size is generally 60 to 62 mm in the Kanto region and 70 to 72 mm in the Kansai region, and it is very advantageous in practice to have the same total size.

The width of the outer periphery and the plate-like ribs 2, 3, and 4 is usually 2 to 5 mm at the front end, and the width of the molded product at the time of manufacture is increased by 2 degrees or less toward the base of the weir. This is preferable for improving the omission of the holes. More preferably 1
Degree or less, particularly preferably 0.5 degree or less.

The number of the plate-like ribs 3 and 4 varies depending on various conditions such as the size of the resin-concrete casting mold 10 and the thickness of the weir board 1, and is not particularly limited. In the width direction, they are provided at intervals of 20 to 300 mm.

The resin concrete casting form 1 of the present invention
0 indicates that the surface roughness of the surface of the weir plate is 10 μm or more and 150 μm or less as the value of the maximum roughness measured by a surface roughness meter described later. When the value of the maximum roughness of the surface is smaller than 10 μm, the surface becomes too smooth, so that when the mortar is applied to the concrete surface cast using this or the tile is bonded, the interface with the concrete is joined. Due to the low strength, there is a high risk that the applied mortar or glued tile will come off. Maximum surface roughness of 150μ
If it is larger than m, the joining force between the formwork and concrete is large when the formwork is dismantled after casting concrete,
It becomes very difficult to peel off, and there are problems such as breakage of the resin concrete casting formwork and peeling of the cast concrete surface. The maximum roughness of the surface is more preferably 20 μm or more and 80 μm or less.

Examples of the resin used in the present invention include thermoplastic resins such as polyethylene, polypropylene, polyvinyl chloride, ABS resin, polyamide, polycarbonate, polyethylene terephthalate and other general thermoplastic resins, and modified polymer alloys thereof. Or a blend of these. In addition, as a thermosetting resin,
Epoxy resins, unsaturated polyester resins, phenol resins, melamine resins, and the like can be given. Thermoplastic resins are preferred from the point of molding cycle and recycling,
Further, among thermoplastic resins, polypropylene resin having high mechanical strength and heat resistance and high glass fiber reinforcing effect is more preferable.

The above-mentioned resin includes a generally used heat stabilizer,
Various additives such as ultraviolet inhibitors, coloring agents, inorganic fillers and the like may be added as necessary.

These resins may contain various reinforcing fibers for improving the strength and the elastic modulus. Examples of the reinforcing fiber include glass fiber, carbon fiber, and aramid fiber. The length of the reinforcing fiber is preferably 0.1 mm or more, more preferably 0.5 mm or more, from the viewpoint of improving strength. Further, from the viewpoints of filling and dispersibility of the fiber into the product, pulverization and reuse at the time of disposal, the length of the reinforcing fiber is preferably 50 mm or less, more preferably 15 mm or less.

The amount of the reinforcing fibers to be mixed with the matrix resin is from 5 to 50% by weight from the viewpoint of physical strength and moldability as a concrete casting mold.
Is preferable, and 10 to 40% by weight is more preferable.

The method for producing the resin concrete casting mold of the present invention is not particularly limited as long as the above-mentioned surface roughness is satisfied. Examples of the molding method include injection molding and pressing. Various methods can be adopted. For example, when a reinforcing fiber-containing thermoplastic resin is used, the cutting of the reinforcing fibers during molding is suppressed, or the filling properties of the resin into ribs and the like, and the appearance of the product after molding, such as warpage and deformation, are reduced. It is preferable to mold by a hot press method or a (low pressure) injection compression molding method.

The reinforcing fiber-containing thermoplastic resin used as a raw material may be a melt of a thermoplastic resin containing reinforcing fibers, or a previously produced reinforcing fiber-containing thermoplastic resin sheet, for example, a stampable sheet. May be heated to a temperature not lower than the melting temperature of the resin. However, in the case of producing the high outer periphery and the plate-like ribs 2, 3, and 4, it is preferable to use a melt.

The roughness of the surface of the weir plate can be adjusted to a desired value by embossing the surface of the mold or optimizing the molding conditions. As the molding conditions, in the (low pressure) injection compression molding method, a method of optimizing the compression pressure at the time of molding can be adopted.

The resin concrete casting mold 10 of the present invention is usually used as it is as a product, but a surface material is attached as necessary for the purpose of imparting water permeability. Is also good. Examples of the surface material used for this purpose include various thermoplastic resin sheets, films, and woven fabrics.

[0027]

The resin casting concrete formwork with ribs according to the present invention is easier to dismantle and peel after casting concrete than the conventional casting concrete formwork, and the concrete after casting. Since the surface has an appropriate roughness, peeling of the mortar applied to the surface and peeling of the tile hardly occur, and its practical utility value is very high.

[0028]

The present invention will now be described by way of examples, which should not be construed as limiting the invention. In addition, the test method in an Example and a comparative example is as follows.

[Measurement of Surface Roughness] The maximum roughness of the surface of the weir plate of the molded product was measured using a surface roughness meter “Surf Test 3” manufactured by Mitutoyo Corporation.
01 ". The measurement conditions were as follows. Thirteen random positions on the surface were measured with one point being the result measured for a length of 30 mm for each sample, and the average value was taken as the maximum roughness value.

[Preparation of Resin Formwork] A glass fiber reinforced polypropylene resin formwork was prepared by the following various methods. (1) A long fiber polypropylene pellet containing 50% by weight of glass fiber and a polypropylene pellet having a weight ratio of 5
The mixture was mixed at 0:50, supplied to an injection molding machine having a capacity of 13200 cc, plasticized at a temperature of 210 ° C. and a back pressure of 5 kg, and a mold having a mirror-finished surface of a mold corresponding to an open crest plate placed in a press was used. After being supplied into the mold for frame molding, press mold clamping pressure (a) 30 kg / cm ² , (a) 100 kg / cm
And molded at ² conditions, to obtain a molded article 1.

Next, a metal plate finished with a maximum surface roughness of 60 μm was placed on the weir plate portion, and was molded under the press-clamping pressure described in (a) above to obtain a molded product 3.

The same material as described above is supplied to the same injection molding machine to be plasticized and supplied in advance into a closed mold forming mold at a mold clamping pressure of 1000 kg / cm ^2.
Molding was performed at 00 kg / cm ² to obtain a molded product 4.

The weight of the molded products 1 to 4 is 9.8 ± 2 k
g. Table 1 shows the maximum surface roughness of each molded product.

A sheet of glass fiber swirl mat impregnated with polypropylene resin (glass fiber weight content: 3
0%) was preheated to 250 ° C., supplied into a mold for forming a mold, and molded at a mold clamping pressure of 100 kg / cm ² to obtain a molded product 5. The weight of the molded product was 10.0 kg.
Table 1 shows the maximum surface roughness of the molded product 5.

Concrete was cast using the molded article obtained above, and the results of measuring the peelability of the mold after the casting and the mortar applied to the concrete surface after the casting and the peel strength of the mortar were measured. The results are shown in Table 1.

The concrete casting and dismantling conditions are as follows: two molds are opposed to each other, a separator is held in parallel at a distance of 150 mm by a separator, concrete of slump 18 is poured between the molds, and dismantled after 36 hours. The workability was observed. X indicates a state in which a considerable amount of force is required for peeling, and some concrete adheres to the surface of the formwork. ○ indicates that the concrete can be easily peeled off and hardly any concrete adheres to the peeled surface. Is shown.

The condition for evaluating the peelability of the mortar is as follows. A weir having a height of 150 mm is provided on the outer periphery of a horizontally installed mold, the mortar is poured into the dam, and the mortar is maintained for 7 days. The concrete wall was held horizontally with the cut surface facing up, and a mortar of slump 20 was applied with a small hand thereon, and the peel strength of the surface was measured two weeks later. Peel strength was measured on the mortar surface by 100 mm x 1
A notch deeper than the concrete surface of 00 mm was made, and an iron plate was attached to the mortar surface with an epoxy adhesive, and the iron plate was peeled off to measure the peel strength.

From the above results, it was found that the molded products 2 and 3 were excellent in the releasability from the concrete after casting and excellent in the bondability between the concrete casting surface and the mortar.

[0039]

[Table 1] Table 1

(Note) Adhesion strength with mortar> 18 indicates cohesive failure inside mortar.

[Brief description of the drawings]

FIG. 1 is a perspective view of an example of a concrete casting formwork with ribs according to the present invention.

[Explanation of symbols]

1: Weir plate 2: Outer peripheral plate-like rib 3: Vertical reinforcing plate-like rib 4: Lateral reinforcing plate-like rib 10: Overall view of resin mold

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI B29K 105: 12

Claims (4)

[Claims] In a concrete casting mold made of ribs comprising a weir and a rib, the surface roughness of the weir is 10 μm or more and 150 μm or more, expressed as the maximum roughness measured by a surface roughness meter. A concrete casting formwork with ribs, characterized by the following. 2. The method according to claim 1, wherein the roughness of the surface of the weir plate is 20 μm or more and 80 μm or less, expressed as a maximum roughness measured by a surface roughness meter. Formwork. 3. The concrete casting mold for ribbed resin according to claim 1, wherein at least one of the dam and the rib is made of a glass fiber-containing thermoplastic resin composition. 4. The concrete casting formwork with ribs according to claim 3, wherein the thermoplastic resin is a polypropylene resin.