JPH04136367A - Mold plate for placing concrete - Google Patents

Abstract

PURPOSE:To make excellent the surface strength of a mold plate for placing concrete by laying on at least one side of a core a face member having at least two layers of a reinforcing layer and a peeling layer so as to form the mold plate. CONSTITUTION:When a mold plate for placing concrete is used as a convertible type a face member 2 having two layers of a reinforcing layer 3 and a peeling layer 4 is laid on at least one side of a core 1. When the mold plate is used as a disposable type a face member 2 having two layers of a reinforcing layer 3 and an adhesive layer 5 is laid on at least one side of the core 1. The compressivity elastic factor of the mold plate of either type is more than about 100kg/cm<2> as the whole of the mold plate. The compressivity elastic factor EC is indicated by an expression (I). The surface deformation and damage of the mold plate can thus be prevented against external impact, pressure and the like.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is directed to concrete having particularly excellent surface strength, which is used in the construction of concrete pouring formwork for reinforced concrete construction (RC construction) or steel reinforced concrete construction (SRC construction). Regarding a form board for driving.

(Prior Art) Conventionally, in constructing formwork for RC or SRC construction, the formwork materials commonly used are plywood, taking into consideration the requirement of having strength that can withstand the lateral pressure during concrete pouring. There are metal plates, plastic plates, etc. It has been used especially for plywood form boards since the late 1950s,
Currently, it is the most frequently used. On the other hand, for insulation construction of RC buildings and SRC buildings, the insulation material has structural strength, is used as formwork, and at the same time uses its adhesive strength with concrete to be bonded integrally with the concrete frame. Attempts have also been made to form a heat insulating material on the surface of the concrete structure (Japanese Patent Laid-Open No. 63161241, etc.).

(Problem to be solved by the invention) However, general formwork boards such as plywood are heavy;
It was difficult to handle, had problems in terms of workability, and had no use after being used several times (and had to be disposed of by incineration as waste material.On the other hand, insulation boards that can also be used as formwork are lightweight and easy to handle. Although it is good, there is no idea that it can be used as a substitute for formwork boards.・It is a concrete type that cannot be used as a substitute for formwork boards and does not require insulation material to be formed on the surface. It could not be used as a frame.

In addition, formwork boards such as insulation boards and plastic boards that also serve as formwork,
Generally, the problem is that the surface strength is insufficient. For example, these formwork plates are susceptible to dents on the surface due to collisions with protrusions and the like during handling. In addition, at the formwork construction stage, as shown in FIG.
Since the seat 15 of the separator 14 is relatively small, the form plate 10 is locally compressed and dented as shown in the figure.

As a result, not only is it not possible to secure a predetermined thickness of the concrete frame 16 after concrete pouring, but the area around the abutting area of the separator seat 15 in the frame 16 becomes partially protruded as shown in FIG. A problem was occurring. In the figure, 12a is a vertical butterfly material, 12b is a horizontal butterfly material, 22 is plywood as a formwork board, and 23 is a peacon.

This problem arises when the formwork is used as a repurposed formwork, and when cross-finishing the concrete surface after dismantling the formwork, a thin mortar finish I7 is applied as a general groundwork method, as shown in Figure 6, but this separator The partial protrusion 18 of the seat 15 requires a considerable coating thickness, leading to an increase in the cost of underlayment construction, resulting in an economically unsuitable coating. Furthermore, when used as a heat insulating material that also serves as a disposable formwork, as shown in FIG. The lateral pressure of the concrete caused dents 19 and groove deformation on the contact surface of the batten material. In the case of such usage, when the gypsum board 20 is applied as a GL construction as an interior base material for cross finishing using a general construction method as shown in FIG. , the amount of GL bond 21 applied to the smooth surface other than the part that contacts the butter material increases, and the amount of applied GL bond 21 decreases on the protruding part 18, and furthermore, due to the imbalance of drying shrinkage of these bonds, the gypsum board 20 Problems such as unevenness on the surface and the growth of mold on the surface of the gypsum board occurred due to the large amount of moisture caused by the bond. Moreover, the recessed portion 1 of the formwork board 10
9 gradually returned to its original state, pushing up the GL bond 21, causing problems such as waving on the gypsum board surface 20, deformation of joints, and vertical streaks on the cross. In particular, formwork plates that are repeatedly used multiple times are susceptible to various types of damage, deformation, etc. as described above, which is considered a serious problem because their commercial value is significantly impaired.

The present invention has been made to solve the above problems,
In particular, it has excellent surface strength, is lightweight and easy to handle, and can be reused several times like a general form board, or does not require insulation to be formed on the surface in the end. The object of the present invention is to provide a concrete pouring form board that can be used as a disposable form for a concrete frame.

[Means to solve the problem]

Both of the two formwork boards for concrete pouring of the present invention are formwork boards formed by laminating a face material on at least one side of a core material, and the face material has at least two layers, a reinforcing layer and a peeling layer. The surface material has at least one reinforcing layer with peelability, or two reinforcing layers and an adhesive layer.
Either a surface material having at least one layer or a surface material having at least one layer of reinforcing layer having adhesive properties, and any form board has a diameter (1) of the following formula % formula % in the entire form board. , L: Thickness of the formwork plate (cm), ΔL: Amount of indentation (cm) 3 The compressive elastic modulus: Eo is 100 kg/d or more.

The formwork board for concrete pouring of the present invention basically has a face material 2 formed on at least one side of a core material 1 as shown in FIGS. 1 and 2, and is a repurposed formwork board. In this case, at least a reinforcing layer 3 and a release layer 4 are used as the facing material 2.
02 layers (Fig. 1), and in the case of a disposable formwork type form board, it is constructed by forming at least two layers, a reinforcing layer 3 and an adhesive layer 5, as the facing material 2 ( Figure 2).

Note that the release layer 4 and the adhesive layer 5 must be laminated so that they become the outermost layer when concrete is poured.

The above-mentioned face material 2 does not necessarily have to have a multi-layer structure, but may have a single-layer structure including a reinforcing layer with releasability or a reinforcing layer with adhesive properties. Moreover, when the facing material 2 is formed only on one side, if the reinforcing layer 3 is formed on the opposite side, excellent surface strength can be ensured on both sides.

Further, if necessary, multiple reinforcing layers can be provided, and a moisture-proofing function can be added by using a reinforcing layer having moisture-proofing properties. Furthermore, it is also possible to add a surface material having other functions as necessary.

The formwork board of the present invention having the layered structure as described above has a compressive elastic modulus: Ec expressed by the following formula for the entire formwork board: 100 kg/cff1 or more, preferably 180 to 500 kg/aa belongs to. In the formula, P is when a load is applied to a 1100m x 100+ size test piece 6, which is a form plate, through a cylindrical indenter 7 of 30φ x 30m at a speed of 10sa+7 minutes, as shown in Figure 3.
The maximum load value while the relationship between the load and the strain amount of the test piece is proportional, that is, the load P at the boundary point X when changing from a straight line to a curved line in the load-strain diagram shown in FIG. This is the so-called proportional variable time load (kg). In addition, the formula is the diameter (am) of the cylindrical indenter 7 as shown in Figure 3.
, t indicates the thickness (cm) of the form plate (test piece), and Δt indicates the amount of dent (cm) in the test piece during proportional variable time loading, respectively.

When this compressive elastic modulus is less than 100 kg/c-J,
It does not have sufficient surface strength as a formwork board, is easily damaged by external impacts, and is susceptible to dents and deformation due to localized pressure from separator seats, butter materials, etc. during formwork construction. There are problems such as the occurrence of On the contrary, it is 500
If it exceeds kg/cd, the material constituting the formwork plate tends to be thicker in order to improve its strength, which is unfavorable in terms of weight and economy. The formwork plate of the present invention has the advantage that when a load equal to or less than the above-mentioned specific proportional limited time variable load is applied, the dents on the surface caused by the load recover and disappear.

The reinforcing layer is basically a layer to increase the surface strength (hardness) of the formwork board. Specifically, it is a layer that increases the surface strength (hardness) of the formwork plate. Specifically, it is a layer that is used to increase the surface strength (hardness) of the formwork board. Any material may be used as long as it can bear the tensile stress or compressive stress that occurs on the front and back sides of the formwork board due to pressure and lateral pressure during concrete pouring. In addition, it is more preferable if it can ensure satisfactory dimensional stability against changes in the natural environment such as rain and direct sunlight from the time of manufacturing the form board to the time of construction (during concrete pouring). This reinforcing layer can be made of water-resistant liner, water-resistant kraft, -g liner general kraft, aluminum foil, iron foil, polyester nonwoven fabric and film, asbestos paper, charcoal paper, inorganic mixed nonwoven fabric such as kaolin, glass nonwoven fabric, and aluminum hydroxide. It is composed of at least one material selected from the group consisting of a nonwoven fabric as a base material, a nonwoven fabric mixed with pulp and glass fibers, a fusion-bonded paper mixed with thermoplastic resin fibers, and the like.

In addition, these reinforcing layer materials may be multi-layered using an adhesive such as urethane, urea, phenol, vinyl acetate, rubber, or epoxy resin, or extruded resin such as polyethylene or polypropylene. Furthermore, resins such as urethane, epoxy, phenol, or resin mortar may be applied to these reinforcing layer materials, the above resins or resin mortar may be applied to the soft surface material or directly onto the core material, or resins may be applied directly to the core material. Mesh made of glass, metal, etc., reinforced with embedded resin or the resin mortar mentioned above are still effective with improved physical properties such as shear, tension, and impact resistance by 1.7. For example, when an epoxy resin is used as the resin coating reinforcement, the coating thickness is preferably about 0.2 to 1 thick from the viewpoint of economy, performance, etc.

The release layer is not attacked by the alkaline components of concrete, is water resistant, and has almost no adhesion to concrete, with an adhesion force of 0.1 kg/c-
J or less is sufficient, preferably 0.03 kg/c'
I! T level is good. This release layer is made of at least one material selected from the group consisting of polyethylene, polypropylene, silicone resin, polyester, polyvinylidene chloride, fluorine film, ABS resin, and polyvinyl chloride films or sheets. is preferred. Alternatively, it may be made of urethane-based or silicone-based wax.

In addition, as a reinforcing layer having peelability, a synthetic resin film or sheet that has strength to withstand external impact, lateral pressure, etc. and has mold releasability from concrete, such as polyethylene, polyester, polypropylene, silicone resin, etc.
Among polyvinylidene chloride and polyvinyl chloride resin films and the reinforcing layer materials, those that already have releasability, or those that have been subjected to mold release treatment such as applying a mold release agent etc. to the surface. used.

The adhesive layer is for firmly adhering to concrete as it hardens after concrete is poured. This adhesive layer can be made of polyester nonwoven fabric, asbestos paper, charcoal paper, inorganic mixed nonwoven fabric such as kaolin, glass nonwoven fabric, nonwoven fabric based on aluminum hydroxide, valve and glass fiber mixed nonwoven fabric, or thermoplastic resin fiber mixed paper fused. It is preferable to use at least one material selected from the group consisting of processed paper and the like. It may also be made of adhesive for concrete, and if it is made of adhesive, it is desirable to mix glass fiber or the like or embed mesh etc. in order to increase the tensile strength after curing. . The coating thickness of the adhesive is preferably 0.5 m or more, and in consideration of weight reduction, the upper limit is preferably 1 mm.

Examples of reinforcing layers with adhesive properties include polyester nonwoven fabric, asbestos paper, charcoal paper, glass nonwoven fabric, pulp and glass fiber blended nonwoven fabric, thermoplastic resin fiber blended fusion processed paper, and nonwoven fabric based on aluminum hydroxide. is used.

Alternatively, it may be an adhesive layer with increased strength; in this case, it is desirable to have a roughened surface with irregularities in order to improve adhesion to concrete.

The facing material 2 in the present invention is constructed by appropriately combining the various layers described above together with the core material, or by selecting materials, etc., while taking into consideration the compressive elastic modulus within the above numerical range and the weight ratio.

The core material must be able to sufficiently bear the shear stress caused by lateral pressure during concrete pouring.

This core material includes a honeycomb core such as a vapor honeycomb or an aluminum honeycomb, a synthetic resin foam such as a hard urethane foam, a styrene foam, a phenol foam, an isocyanurate foam, an epoxy foam, and a vinyl chloride foam, and a synthetic resin foam such as a honeycomb core such as a vapor honeycomb or an aluminum honeycomb. It is preferable that the core is filled with at least one material selected from the group consisting of those filled in the core. When a hard urethane foam or the like is used as the core material, it is preferable to provide paper facing materials on both sides of the foam in advance in order to maintain the foam shape.

[Effect]

In the present invention, the face material always has a reinforcing layer on at least one side of the core material to form a laminated structure, and it also has characteristics related to a specific compressive elastic modulus, so it has particularly excellent surface strength (hardness). Deformation and damage occur due to external forces during handling, local pressure from the separator seat when tightening the batting material during formwork construction, concrete side pressure acting on the contacting part of the batting material during concrete pouring, and impact. hard. In addition, since neither the core material nor the face material uses particularly heavy materials, it is lightweight and easy to handle. Moreover, due to the lamination of the facing material, the reinforcing layer resists the deformation force caused by the contraction or expansion of the core material, against the influence of natural environmental elements such as rain and direct sunlight until the concrete is poured.
It also has excellent dimensional stability.

In addition, in the case of laminated facing materials that have a peeling layer (or a peelable reinforcing layer), concrete can be poured using the side of the formwork board where the facing material is located, so that the surface material can be easily removed after the concrete has hardened. It facilitates the dismantling of formwork plates and can be used for multiple rotations. In the case of laminated facing materials that have an adhesive layer (or adhesive reinforcing layer) as facing materials, the concrete can be cured by pouring concrete using the side of the formwork board where the facing materials are located. At the same time, the formwork plates are firmly bonded and integrated with the concrete. In this case, the extra process of disposing of used form board waste becomes unnecessary.

[Example] Hereinafter, the present invention will be explained in more detail with reference to Examples.

Examples 1 to 8, Comparative Examples A 20 m thick rigid polyurethane foam having the density shown in the table was used as the core material, and each surface material shown in the table was similarly provided on both the front and back sides of this core material. The compressive elastic modulus (
A formwork board having EC) was created. The formwork plates of Comparative Examples and Examples 1 to 4 were disposable formwork types, and Examples 5 to 8
The formwork board is of a repurposed type.

Regarding the bending strength of each form plate obtained, JISAI414
The results are shown in the table.

Further, using these formwork plates as one side of the formwork, a concrete pouring test was conducted under the following conditions. For formwork construction, plywood is used as the other formwork board, and as shown in Fig.
They were installed at intervals of m, and fixed with 49 m layers of sewn batten material and horizontal batten material with a circular cross section. All the separator seats used were those with a circular bottom of 50φ, and the vertical backing materials were set at a pinch of 100 m in the comparative example and at a pitch of 170 m in the example. Concrete was poured into the formwork to a height of 2.5m. The concrete lateral pressure at that time was 3 to 3.5 tons/bo (the lateral pressure was actually measured at a height of 50C1).

In the above concrete pouring test, the amount of protrusion of the concrete frame due to the separator seat, the amount of indentation on the surface of the formwork plate at the contact area of the grouper (vertical) members, and the amount of protrusion of the formwork plate between the grouper members (vertical) were actually measured. The results are also shown in the table.The above problem is that when concrete is actually poured and used as a formwork, the formwork plates between the vertical battens become smooth surfaces as shown in Figure 5. The shape was slightly bent, and the amount of deflection was measured as the amount of change in deflection.

Furthermore, for the formwork board of the comparative example, the pitch of the vertical butter material was 170.
When we conducted a concrete pouring test in the same way except for setting it in a cabinet, the form board itself was destroyed.
In the end, we were unable to perform any measurements related to the test.

*】: Comprehensive evaluation was performed based on the following criteria.

First, evaluation is made from the following two viewpoints.

In other words, the smoothness of the base in consideration of economic efficiency in thinly applied mortar construction is influenced by the amount of protrusion of the separator seat or the amount of protrusion between the butterfly materials. The first evaluation will be ◎, those exceeding 4 meters as ×, and those in between as ○.

In addition, the life performance of interior groundwork construction such as GL Bond is influenced by the sum of the amount of indentation at the contact area of the grouper wood and the amount of protrusion between the grouper wood, which is a factor in the variation in the amount of pound applied. The average value of GL bond coating amount is 15~
At 20 meters, if the thickness is less than 8m, the moisture in the bond will be absorbed by the concrete body and plasterboard, resulting in lack of moisture necessary for curing, resulting in dryout, and if the amount of application increases excessively, uneven drying and mold will occur. Therefore, from this point of view, we will conduct a second evaluation by assigning ◎ if the sum of the above two degree quantities is 4 countries, × if it is more than 8 countries, and 0 if the sum is in between.

Finally, both the above-mentioned first and second evaluation results are ◎.
In the case of ○ or ×, the overall evaluation was made as ◎, ○, or × in the same way, and if the above two results were different, the evaluation one rank below the higher evaluation result was used as the overall evaluation.

〔Effect of the invention〕

As explained above, in the formwork board of the present invention, a face material always provided with a reinforcing layer is formed on at least one side of the core material, and the compressive elastic modulus of the entire formwork board is 100 kg/cd or more. It has excellent strength and is unlikely to undergo deformation or damage such as dents on the surface due to external impact or pressure during handling or concrete pouring.

Therefore, if the formwork board of the present invention is used, for example, during formwork construction, the formwork board surface may be inadvertently dented or deformed due to the tightening of form ties to fix the formwork board and the frame material (grouper wood, etc.). This is advantageous because it can more reliably form a concrete frame with a good finish. In addition, in the case of discarded formwork type formwork boards,
The deformation due to local pressure at the contact area of the grouper material is extremely small, and as a result, it is possible to prevent variations in dust thickness when installing the interior base material, and it is possible to restore the dented area as with conventional products, making it possible to replace the interior base material (gypsum board). It is possible to form a stable concrete structure that will not be damaged, which is of great practical benefit.

In addition, since the core material and face material of the formwork board of the present invention are not made of very heavy materials, it is particularly lightweight compared to plywood formwork boards, making it easier to handle and significantly improving the workability of formwork construction. improves.

Furthermore, if a face material having a peeling layer or a peelable reinforcing layer is laminated as a face material, it can be used as a repurposed formwork that can be rotated multiple times, which is useful for reducing concrete pouring costs. In addition, by laminating a surface material with an adhesive layer or an adhesive reinforcing layer as a surface material, it can be used as a disposable formwork that can be ultimately bonded to the concrete frame.
There is no need to dispose of leftover formwork boards, which saves troublesome work, and the material of the core material simultaneously provides insulation to the concrete frame.

[Brief explanation of the drawing]

Figures 1 and 2 are adiabatic diagrams showing one embodiment of the form plate of the present invention, Figure 3 is a conceptual diagram showing a method for measuring the load at the proportional limit related to the compressive elastic modulus, and Figure 4 is at the proportional limit. A load-strain line diagram obtained by load measurement, Fig. 5 is an explanatory cross-sectional view showing an example of formwork construction form related to the conventional product or the product of the present invention, and Fig. 6 is concrete obtained with the conventional product)! Fig. 7 is an explanatory diagram showing the state of the IW body, Fig. 7 is an explanatory drawing showing the state of the concrete frame obtained by the conventional waste formwork type, the state of its form board, and the state of mortar finish, and Fig. 8 is the same as Fig. 7. It is an explanatory view showing the groundwork application by a plaster board. 1... Core material 2... Face material 3... Reinforcement layer 4...
・Release layer 5... Adhesive layer 4... Release layer 5... Adhesive layer Figure 2 t Figure 5 Figure 3

Claims (2)

[Claims] (1) A form board formed by laminating a face material on at least one side of a core material, the face material having at least two layers of a reinforcing layer and a release layer, or one layer of a reinforcing layer having peelability. and the following formula E_c=(4P)/(πD^2)・t/(Δt) [P:
Load at proportional limit (kg), D: Diameter of cylindrical indenter (cm)
, t: Thickness of formwork board (cm), Δt: Amount of dent (cm)
] Compressive elastic modulus expressed as: E_c is 100 kg/cm^
A formwork board for concrete pouring, characterized in that it is 2 or more. (2) A form board formed by laminating a face material on at least one side of a core material, the face material having at least two layers of a reinforcing layer and an adhesive layer, or one layer of a reinforcing layer having adhesive properties. and the following formula E_c=(4P)/(πD^2)・t/(Δt) [P:
Load at proportional limit (kg), D: Diameter of cylindrical indenter (cm)
, t: Thickness of formwork board (cm), Δt: Amount of dent (cm)
] Compressive elastic modulus expressed as: E_c is 100 kg/cm^
A formwork board for concrete pouring, characterized in that it is 2 or more.