JPH0665558U - Curing sheet for concrete - Google Patents

Abstract

(57) [Summary] [Purpose] Since it is lightweight, it has good workability in the field, and also has good conductivity
It is a low-priced material that can exhibit heat retention that prevents all three heat transfer states of convection and radiation, has high versatility in both summer and winter, and can also be used as a curing surface curing sheet and a metal foam curing sheet. is there. [Structure] The closed-cell sheets 2 formed of a polyolefin film are multi-layered, and a metal molecular layer 4 having a film thickness of 100 angstrom or more is provided on the surface.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a curing sheet for concrete used in civil engineering construction sites such as dams.

[0002]

[Prior art]

 In civil engineering construction sites such as dams where large quantities of concrete are cast, curing of concrete is extremely important in order to obtain high quality concrete structures.

For example, at a dam site, a curing sheet is arranged at a position in direct contact with a concrete pouring surface, and as such a curing sheet, a material mainly composed of foamed polyurethane is known. This is based on the idea that the open-cell structure of polyurethane foam retains water when laid on a surface that has been hit with water, and this water retention part prevents evaporation.

Further, a blue sheet, which is a general single sheet, is often used instead of the foaming polyurethane curing sheet.

[0005]

[Problems to be solved by the device]

 However, the foamed polyurethane curing sheet becomes extremely heavy when it absorbs water, and it is not easy to wind it up, so it is not suitable for actual use.

On the other hand, the blue sheet has no heat insulating property. In curing dam walls, it was customary to cover the vertical flaps with blue sheets, but blue sheets with such poor heat insulation could only be expected to retain heat.

An object of the present invention is to eliminate the disadvantages of the conventional example, and to provide an inexpensive concrete curing sheet which is light in weight, has good workability on site, and is excellent in heat retention.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention has multiple closed-cell sheets formed of a polyolefin film and has a light-reflecting layer on the surface, and the closed-cell sheet is a cap film having a large number of protrusions. A smooth back film is attached, and the basis weight is 100 g / m2 or more. Furthermore, the polyolefin film contains 1% or more of an ultraviolet absorber and a flat yarn cloth is attached. This is the summary.

[0009]

[Action]

 According to the first and second aspects of the present invention, the closed-cell multi-layer structure can prevent both natural convection heat transfer and heat conduction, and the metal molecular layer provides radiative cooling in winter. Reflects and radiates heat in summer.

Further, because of the structure in which the closed-cell sheets are multiplexed, a function of a kind of labyrinth seal is exerted, water evaporation is prevented, and sufficient heat insulation is obtained.

In this way, the three functions of keeping the metal foam warm, preventing the concrete placing surface from freezing in the winter, and preventing the concrete placing surface from drying in the summer can be simultaneously satisfied.

According to the present invention as set forth in claim 3, in addition to the above action, mechanical strength can be further improved.

[0013]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a partially cutaway perspective view showing an embodiment of a concrete curing sheet of the present invention, and FIG. 2 is a vertical sectional front view of the same.

The concrete curing sheet 1 of the present invention is formed of a polyolefin film, and uses a closed-cell sheet 2 in which a cap film 21 having a large number of protrusions and a smooth back film 22 are attached, The closed-cell sheet 2 is multi-layered (double (2 W) in the figure), and the light-reflecting layer 4 is provided on the surface side thereof.

A liner film 23 may be interposed between the closed cell sheets 2.

As shown in FIG. 3, for example, the configuration of the gas charging section 3 is such that the diameter R of the gas charging section 3 is 10 mm and the distance between the centers of the adjacent gas charging sections 3 is D1 = 11.5. mm and D2 = 10 mm. The height of the closed cell sheet 2 on the lower side in FIG. 2 is 4 mm, the height of the closed cell sheet 2 on the upper side, the flat yarn cloth 5, and the light reflection layer 4 is 4 mm, that is, the thickness of the curing sheet 1 is 8 mm. did.

As the closed-cell sheet 2 made of a polyolefin resin, in which a cap film 21 having a large number of protrusions and a smooth back film 22 are adhered, a widely used cushioning packaging material and others can be used. .

Further, the type of gas filled in the gas filling portion 3 can be appropriately selected in consideration of heat insulation. Further, although not shown in the drawings as another embodiment, a polyolefin film containing an ultraviolet absorber of 1% or more may be used.

The basis weight of the closed cell sheet 2 above the closed cell double structure 2W and the basis weight of the closed cell sheet 2 below were about 110 g / square meter and about 70 g / square meter, respectively.

The combination of the closed cell sheets 2 with the cap film 21 and the smooth back film 22 adhered to each other is such that the back film 22 side is outside and the liner film 23 is interposed between them as shown in FIG. When the flat yarn cloth 5 is provided on the back film 22 of the closed-cell sheet 2 above and the light ray reflection layer 4 is further provided thereon, or the flat yarn cloth 5 is omitted as shown in FIG. Then, the direct light reflection layer 4 may be provided on the back film 22.

Further, as shown in FIG. 6, the lower closed cell sheet 2 has a unit weight symmetrical to that of the upper lower closed cell sheet 2, and a liner film 23 is interposed therebetween. As shown in FIG. 7, the PE film 5 is arranged under the closed cell sheet 2 below. As shown in FIG. 8, the liner film 23 is omitted and the back film 22 of the closed cell sheet 2 above is removed. There are various types, such as a PE film 5 provided on the top, a metal molecular layer 4 further provided thereon, and the PE film 5 omitted from the example of FIG. 8 as shown in FIG.

Next, the method of use will be described. When the upper surface of the concrete placing surface is to be cured, it is laid on the surface of the concrete 6 as shown in FIG.

On the other hand, when the wall surface is cured by concrete pouring, as shown in FIG. 11, the metal foam 7 and the horizontal butter 8 of the form material including the metal foam 7, the horizontal flaps 8 and the vertical flaps 9 are formed. It should be sandwiched between them.

[0024]

[Effect of device]

 As described above, the concrete curing sheet of the present invention abandons the conventional idea that evaporation of water cannot be prevented unless the water is retained due to the open-cell structure. By using the combination of the above, it is possible to obtain a wet curing sheet with good workability on site.

[0025] Furthermore, it can exhibit heat retention that prevents all three heat transfer states of conduction, convection, and radiation, and has high versatility for both summer and winter. In addition, a curing surface curing sheet and a metal foam curing sheet It is a relatively inexpensive one that can also be used.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of a concrete curing sheet of the present invention.

FIG. 2 is a vertical sectional front view showing one embodiment of the concrete curing sheet of the present invention.

FIG. 3 is a plan view showing an embodiment of the concrete curing sheet of the present invention.

FIG. 4 is a partial vertical sectional front view showing a first embodiment of the concrete curing sheet of the present invention.

FIG. 5 is a partial vertical sectional front view showing a second embodiment of the concrete curing sheet of the present invention.

FIG. 6 is a partial vertical sectional front view showing a third embodiment of the concrete curing sheet of the present invention.

FIG. 7 is a partial vertical sectional front view showing a fourth embodiment of the concrete curing sheet of the present invention.

FIG. 8 is a partial vertical sectional front view showing a fifth embodiment of the concrete curing sheet of the present invention.

FIG. 9 is a partial vertical sectional front view showing a sixth embodiment of the concrete curing sheet of the present invention.

FIG. 10 is a vertical cross-sectional front view showing an example of using the concrete curing sheet of the present invention for curing the concrete placing surface on the upper surface.

FIG. 11 is a perspective view showing an example of use of a concrete curing sheet of the present invention for wall surface curing of concrete placing.

[Explanation of symbols]

 1 ... Curing sheet 2 ... Closed cell sheet 2W ... Closed cell double structure 21 ... Cap film 22 ... Back film 23 ... Liner film 3 ... Gas filling part 4 ... Light reflecting layer 5 ... Flat yarn cloth 6 ... Concrete 7 ... Metal foam 8 ... Horizontal flap 9 ... Vertical flap D1 ... Distance between centers of adjacent gas enclosures D2 ... Distance between centers of adjacent gas enclosures R ... Diameter of gas enclosures

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Etsuhisa Takada 4-51 Ota-cho, Naka-ku, Yokohama-shi, Kanagawa Kashima Construction Co., Ltd. Yokohama Branch

Claims (3)

[Scope of utility model registration request] 1. A curing sheet for concrete, comprising a plurality of closed-cell sheets formed of a polyolefin film, and a light-reflecting layer provided on the surface thereof. 2. The concrete curing sheet according to claim 1, wherein the closed-cell sheet is obtained by sticking a cap film having a large number of protrusions and a smooth back film, and has a basis weight of 100 g / square meter or more. 3. The curing sheet for concrete according to claim 1, wherein the polyolefin film contains 1% or more of an ultraviolet absorber and a flat yarn cloth is attached.