JPH0687561U - Tape for concrete formwork - Google Patents

Abstract

(57) [Summary] [Structure] Adhesive layer 3 is provided on the surface of substrate 2, and said adhesive layer 3
A concrete formwork having a peelable coating layer 4 on the surface of the tape, and the width X of the tape 1 is configured to be narrow corresponding to the thickness Y of the wood mouth face 6 and / or the side face 7 of the concrete formwork plywood 5. Adhesive tape. [Effect] When pouring concrete, it is easy to construct, prevents the concrete kneading material from leaking outside from the joints of the formwork, and does not cause unevenness on the hardened concrete surface, so there is no need to repair the uneven surface, The concrete surface is smooth and beautifully finished.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an adhesive tape for concrete formwork, and more particularly to a narrow adhesive tape used for placing concrete in a construction site or the like.

[0002]

[Prior art]

 A formwork (concrete panel) is used when placing concrete at a construction site. The general main process of concrete placement is to pour concrete mixing material into a concrete panel, cure it, and cure it. After curing, peel off the panel from the cured concrete. Therefore, it is necessary for the panel to have a function of holding concrete that has fluidity during curing in a predetermined mold, and for the concrete launch surface to be beautifully finished. ing. When plywood for concrete formwork is used for concrete panels, the size of the plywood is stipulated in the Japanese Agricultural Standards. Therefore, multiple plywoods are connected to form a formwork of appropriate size. In that case, the concrete kneading material may leak to the outside from the seams of the formwork, causing unevenness on the hardened concrete surface.Therefore, it may be necessary to repair the uneven surface. It may be damaged. Examples of documents describing concrete panels include JP-A-52-482322, JP-A-55-36555, JP-A-60-184810, JP-A-48-48561, and JP-A-59-91251. .

[0003]

[Problems to be solved by the device]

 The present invention aims to solve the drawbacks of the prior art, and an object thereof is to provide a suitable member for use in the concrete pouring described above.

[0004]

[Means for Solving the Problems]

 The present invention has an adhesive layer on the surface of a base material, and has a peelable coating layer on the surface of the adhesive layer, so that the tape width can be attached to the wood mouth surface and / or the side surface of the concrete formwork plywood. The present invention relates to a narrow width adhesive tape for concrete formwork, which is characterized in that it is formed into a narrow width. In a preferred embodiment, the base material is made of an elastic material, and the tape width is 10.5 mm to 12 mm.

[0005]

[Action]

 The tape of the present invention comprises an adhesive layer on the surface of a base material, and a peelable coating layer on the surface of the adhesive layer, the width of which is the opening surface of the plywood and / or the plywood constituting the concrete formwork. Or, it has a narrow width so that it can be attached to the side surface, so that the cover layer can be easily peeled off when the concrete is cast to expose the adhesive layer, and the wooden mouth of the thin plywood It can be easily attached to the surface and / or side surface, and when concrete is placed, the concrete formwork plywood is brought into close contact with it to prevent the concrete kneading material from leaking from the seam of the formwork to the outside. As a result, it is possible to prevent unevenness on the hardened concrete surface, which would require repairs on the uneven surface or to damage the appearance of the concrete uplifting surface. Can be finished That. In particular, in a preferred embodiment, the base material is composed of an elastic body, and the elastic body adhered by an adhesive is closely attached to the joint of the plywood, so that the flow of the kneading material is further prevented, The concrete launch surface is smooth and beautifully finished. Further, since the tape width is configured to be 10.5 mm to 12 mm, it can be used extremely practically while exhibiting the above effects.

[0006]

【Example】

 Next, the present invention will be described with reference to the drawings illustrating an embodiment. As shown in FIG. 1 (A), the tape 1 of the present invention comprises an adhesive layer 3 on one side of a substrate 2 and a coating layer 4 on the surface of the adhesive layer 3. The base material 2 is made of, for example, synthetic resin, cloth, non-woven fabric or the like, and an elastic body, particularly a plastic foam body such as foamed polyethylene or foamed polyurethane is preferable for the purpose desired in the present invention, and should be thin and elastic. However, it is preferable from the viewpoint of tightly adhering the plywood for concrete formwork to reduce leakage. As the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 3, solvent-based pressure-sensitive adhesives such as rubber-based, acrylic-based, and silicone-based pressure-sensitive adhesives, emulsion-type, hot-melt-type, calender-method-type, water-soluble, liquid-curable-type pressure-sensitive adhesives. Examples thereof include a tackifier, and it is preferable to add a tackifier to the tackifier. Examples of the tackifier include rosin-based, terpene-based and synthetic petroleum resin-based tackifiers. The adhesive layer 3 is generally made of an acrylic ester adhesive. The adhesive layer 3 may be one using an adhesive such as urethane type, vinyl acetate type, acrylic type and rubber type. The coating layer 4 can be peeled off from the adhesive layer 3, and is peeled off from the adhesive layer 3 on the substrate 2 in use as shown in FIG. 1 (B). The coating layer 4 is made of paper such as kraft paper, coated paper, high-quality paper, impregnated paper, synthetic resin film such as polyester, nylon, ethylene-vinyl alcohol copolymer or cloth such as woven cloth and non-woven cloth. It is composed of species. These are preferably subjected to a peeling treatment. The width (X) of the tape 1 is narrow so as to correspond to the thickness (Y) of the plywood for concrete formwork. Thickness of the plywood for concrete formwork [Ministry of Agriculture and Forestry Notification No. 932, June 30, 1972] at the specified size (unit: mm) and the difference between the measured size and the specified size (unit: mm) The relationship with is as follows. Specified size (thickness) Measured size difference 12.0 ± 0.5 15.0 ± 0.6 18.0 ± 0.7 21.0 ± 0.8 24.0 ± 0.9 For concrete formwork When the thickness (Y) of the plywood is 12.0 ± 0.5 mm, the width (X) of the tape corresponds to it, from 11.5 mm to 12.5 mm, but the actual use of the tape, its cost, and the Considering the tape width and the like that can achieve the desired purpose, 10.5 mm to 12 mm is preferable. It is preferable that the tape 1 has a width that can correspond to the thickness 12.0 ± 0.5 mm of the plywood for concrete formwork as described above, which is as thin as possible. The tape 1 may have an overall thickness of 2 mm or less.

As shown in FIG. 1 (C), the adhesive tape 1 having the above-described narrow width is peeled off from the covering layer 4 on the opening 6 and / or the side 7 of the plywood 5 for concrete formwork. , And stick the three adhesive layers. The plywood which is adjacent to the plywood 5 efficiently by adhering to the two surfaces of the mouth end surface 6 and the side surface 7, although it may be adhered to all the peripheral surfaces (four surfaces) of the end surface 6 and the side surface 7. It is possible to fill the gap between the seam and 5.

FIG. 2 is an explanatory view of an example of a main part of a concrete formwork that joins a plurality of plywoods 5 together. As shown in FIG. The plywood 5 is attached to the surface and the plywoods 5 are connected to each other. As shown in FIG. 2 (B), the adhesive tape 1 is loaded at the joint between the plywood 5 and the plywood 5 to form the mold 8. Constitute. Although not shown, the plywood 5 and the plywood 5 are connected by bolts or the like.

In the above example, a paper-coated adhesive tape having a foamed plastic layer having a width of 11.7 mm and a total thickness of 1 mm was adhered to two sides of a plywood for concrete formwork having a specified thickness of 12 mm, that is, a wood mouth side and a side surface. As shown in FIG. 2 (B), a formwork is formed, and a kneading material composed of cement (mortar), water, aggregate, etc. is injected, cured, and cured. At the joint of the plywood, Since the elastic body consisting of the foamed plastic layer was in close contact, the mixing material was prevented from flowing out, the concrete-launched surface was smooth and beautifully finished, and there was no need to repair the uneven surface.

[0010]

[Effect of device]

 According to the present invention, when pouring concrete, the construction is easy, the plywood for concrete formwork is brought into close contact, and the leakage of the concrete kneading material from the seam of the formwork to the outside is prevented. Unevenness occurs on the hardened concrete surface, which requires repairing the uneven surface and impairs the appearance of the concrete launch surface, thus making it possible to finish the concrete launch surface beautifully. INDUSTRIAL APPLICABILITY The present invention can be applied not only to various types of plywood such as decorative plywood, but also to metal molds and the like.

[Brief description of drawings]

FIG. 1A is a sectional view of an essential part showing an embodiment of the tape of the present invention, FIG. 1B is an explanatory view of using the tape showing an embodiment of the present invention, and FIG. 1C is an embodiment of the present invention. Illustration of tape usage,

FIG. 2A is a perspective view of a main part of a tape mold configuration showing an embodiment of the present invention, and FIG. 2B is an explanatory view of a tape mold configuration showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tape 2 ... Base material 3 ... Adhesive layer 4 ... Covering layer 5 ... Plywood for concrete formwork 6 ... Kiguchi side 7 ... Side surface 8 ... Concrete formwork

Claims (3)

[Scope of utility model registration request] 1. A substrate having an adhesive layer on the surface thereof, comprising a releasable coating layer on the surface of the adhesive layer, and having a tape width capable of being adhered to the wood mouth surface and / or side surface of a plywood for concrete formwork. A narrow adhesive tape for concrete formwork, characterized in that it is formed into a narrow width. 2. The narrow adhesive tape for concrete formwork according to claim 1, wherein the base material is made of an elastic material. 3. The narrow adhesive tape for concrete formwork according to claim 1, wherein the tape width is configured to be 10.5 mm to 12 mm.