JPH07102763A - Curing sheet for concrete - Google Patents

Abstract

PURPOSE:To omit the trouble of operation, and to enable the execution of works in a short period by projecting and forming a plurality of projections, which are stuck detachably onto the surface of forms and in which diameters are expanded toward the concrete-placing surface side, from a curing sheet. CONSTITUTION:Concrete C is placid into forms 2 under the state, in which a curing sheet 1 is stuck on the form surface of forms 2, and the curing sheet 1 is left on the surface of a concrete structure under the state, in which the projecting sections 3 of the curing sheet 1 are bitten to the surface of concrete C, when the forms 2 are removed after concrete C is solidified. When the curing sheet 1 is pulled forcibly from the surface of concrete C after curing is completed, the curing sheet 1 is peeled off from the surface of concrete C while the projecting sections 3 are distorted elastically or the roots of the projecting sections 3 are cut, thus removing the curing sheet 1. Accordingly, forms can be taken off at an early stage after concrete is placed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete curing sheet in which the number of steps for sticking work is eliminated.

[0002]

2. Description of the Related Art Conventionally, in order to prevent soiling of a concrete structure after pouring concrete and prevent premature evaporation of water, a mold can be left without being removed from the concrete, A method of attaching a curing sheet such as a vinyl sheet after removing the frame is performed.

[0003]

However, in the former case, the short-term workability is poor, and there is a drawback that concrete adheres to the mold surface or the surface is soiled by rust and the like generated on the mold surface. On the other hand, in the latter case, since a relatively wide vertical surface is covered with a sheet, the sticking work is troublesome, especially the work of adhering the sheet to the concrete surface is troublesome, and once the mold is released. Since the concrete surface is exposed to the outside air, the covering work needs to be quick, which is a problem mainly in terms of workability.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a concrete curing sheet that can be constructed for a short period of time and that saves labor.

[0005]

In order to achieve the above object, the curing sheet of the present invention is a concrete curing sheet for covering the surface of a concrete structure after demolding a mold, the curing sheet comprising: It is characterized in that it is detachably attached to the surface of the frame and that a plurality of projections whose diameter is enlarged toward the concrete placing surface are formed in a protruding manner.

[0006]

[Advantage] According to the above construction, when the curing sheet is attached to the mold surface, concrete is placed inside the mold, and when the mold is removed after the concrete is solidified, the projections of the sheet eat into the concrete surface. The sheet is left on the surface of the concrete structure in the packed state. After the curing is completed, if the curing sheet is forcibly pulled from the concrete surface, the sheet can be peeled off from the concrete surface while elastically deforming the protrusions, or the roots of the protrusions can be cut off and the sheet can be removed.

The holes formed on the concrete surface corresponding to the protrusions can be filled by a repair process using a filler such as mortar.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a curing sheet 1 according to the present invention and a steel mold 2 to which the curing sheet 1 is attached to the inner surface (concrete placing surface side).

The curing sheet 1 has a thickness of, for example, 0.1 to 5
A thin, non-breathable sheet, such as a polypropylene sheet of about mm, which is hard to some extent, is formed by vacuum forming or the like to have a plurality of projections 3 having an Ω-shaped cross section and expanded in the vertical and horizontal directions at a predetermined pitch. The sheet 1 is cut into an area corresponding to the size of the mold 2, and a bent portion 1a to be folded into the side surface of the mold 2 is formed on the four circumferences thereof. A through hole 1b having the same pitch as the connecting hole 2a formed on the side surface of the mold 2 is opened.

The sheet 1 is attached to the mold surface of the mold frame 2 by a double-sided adhesive tape or the like, and is used with the bent portion 2a folded in the side surface of the mold frame 2, as shown in FIG. 2 (a). The vertical parts of the formwork are formed by combining the formwork 2 vertically and horizontally and connecting them with the U-clip inserted into the connection hole 2a and the through hole 1b, and the concrete C is poured.

When the concrete C is cast, the projections 3 bite into the surface layer of the concrete C as shown in an enlarged view in a part of the figure, and the concrete C is solidified in this state.

A polypropylene sheet having a relatively high hardness as described above is used so that the projections 3 are not crushed by the pouring pressure of the concrete C, and the diameter of each projection 3 is about 15 to 20 mm. It is desirable to set the protrusion amount to about 20 mm. Further, in order to prevent the curing sheet 1 from peeling off, it is desirable that the projections 3 are formed at a pitch of several tens of cm both vertically and horizontally.

Therefore, after the mold 2 is demolded, the curing sheet 1 is left on the surface of the vertical surface of the concrete structure by the protrusions 3 as shown in FIG. It keeps the close contact state of the concrete and prevents the concrete surface from being soiled and prevents the early evaporation of water.

After the curing of the concrete C is completed, if the curing sheet 1 is forcibly pulled from the surface of the concrete C, the sheet 1 is peeled off from the concrete surface while elastically distorting the protrusions 3, or the roots of the protrusions 3 are removed. The sheet 1 can be removed while being cut and left inside the hole C1 formed in the surface layer of the concrete C and having an Ω-shaped cross section.
It is also possible to forcibly project the remaining protrusions 3.

After the removal, if necessary, as shown in FIG. 2C, the hole C1 is filled with a filler 4 such as mortar to complete a concrete structure. If the curing sheet 1 is provided with an uneven shape, a surface pattern corresponding to the uneven shape can be formed on the concrete molded body, and the texture can be improved.

[0016]

As described above in detail with reference to the embodiments, according to the curing sheet of the present invention, since the mold can be demolded early after placing concrete, compared to the case where the mold is left for the curing period. It is suitable for labor saving because the work for attaching the curing sheet after demolding the mold can be omitted and the work can be done in a short period of time.

[Brief description of drawings]

FIG. 1 is a perspective view showing a curing sheet according to the present invention and a mounting relationship between the curing sheet and a mold.

2 (a) to (c) are explanatory views showing a work procedure from placing concrete to finishing using the curing sheet.

[Explanation of symbols]

 1 Curing sheet 2 Formwork 3 Projection C Concrete C1 hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norihiko Miura 2-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation, Tokyo Headquarters (72) Inori Takenori 2-chome, Kandaji-cho, Chiyoda-ku, Tokyo No. 3 Incorporated company Obayashi Gumi Tokyo headquarters (72) Inventor Masami Kurihara 2-3 chome, Kandajimachi, Chiyoda-ku, Tokyo Incorporated company Obayashi Gumi Tokyo headquarters

Claims (1)

[Claims] 1. A concrete curing sheet for covering the surface of a concrete structure after demolding a mold, the curing sheet being removably attached to the surface of the mold and at the side of the concrete placing surface. A concrete curing sheet, characterized in that a plurality of projections whose diameters are enlarged toward the front are formed in a protruding manner.