JPH06285832A - Mat for curing concrete - Google Patents

Abstract

PURPOSE:To provide a mat used for curing concrete that can maintain an effect of positive heat and hot insulation, and also an effect of water retention for a long period and, moreover, has a relatively simple constitution, and is detached readily with good general purpose use. CONSTITUTION:The concrete curing mat 1 is composed of a heat insulation mat 100 comprising a heat insulation material 10 and a water prevention sheet member 20 that covers the circumference of the heat insulation member 10 and a moistening mat 110 provided on the one surface of the heat insulation mat 100. The heat insulation member 10 is preferably consisting of, e.g. a fibrous heat insulation material such as glass wool or an aggregate of small blocked synthetic resin heat insulation material. Also, the moistening mat 110 is made up of a water retention part 60 of sponge or the like and a water permeable sheet member 70 that covers the circumference of the water retention member 60.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete curing mat suitable for constructing concrete dams and massive bridge piers.

[0002]

2. Description of the Related Art In mass concrete construction, how to prevent the occurrence of cracks caused by temperature stress has become a serious issue. The tensile strength of concrete immediately after placing (up to around 5 days of age) is extremely low. Therefore, when the temperature difference in each part of the concrete becomes extremely large, a tensile stress exceeding the tensile strength of the concrete develops in that part, and the concrete surface is cracked.

[0003] Conventionally, in mass concrete work such as a concrete dam, in order to prevent a sudden temperature drop on the concrete surface, a. Construction interruption during cold season b. Heating concrete mixing water, etc. c. Various measures against cracks such as heat supply and heat retention by floodlights, briquette, oil heaters, etc. are adopted.

[0004]

The above-mentioned conventional measures against cracks do not simultaneously satisfy the two contradictory aspects of crack prevention and workability / economy. That is,
The above-mentioned method a has a problem in that it is restricted in terms of workability, and methods b and c have the drawbacks of requiring large-scale equipment and lacking economic efficiency.

Therefore, an object of the present invention is to provide a concrete curing method which can maintain a reliable heat insulating and heat retaining function and a water retaining function for a long period of time, has a relatively simple structure, is easy to attach and detach, and is excellent in versatility. To provide a mat for use.

[0006]

In order to solve the above-mentioned problems of the prior art, the present invention provides a heat insulating mat having a heat insulating member and a waterproof sheet member that surrounds the heat insulating member, and a heat insulating mat. And a mat for wetting provided on one side of the mat.

[0007]

In the heat insulating mat constituting this concrete curing mat, since the heat insulating member is completely covered by the waterproof sheet member, water does not enter inside during rainfall or breathing. Therefore, the heat insulating property of the heat insulating mat can be reliably maintained for a long period of time.

Further, by placing the concrete curing mat of the present invention on the concrete surface or the mold surface, the heat insulating mat can block the placed concrete and the outside air. Therefore, the poured concrete is hardly affected by the change in the outside air temperature, and the sudden change in the temperature does not occur in the concrete. As a result, it is possible to prevent the occurrence of structural defects such as cracks due to the stress due to the temperature difference inside the poured concrete.

Since a wetting mat is provided on one side of the heat insulating mat, the wetting mat is brought into contact with the surface of the cast concrete to install the concrete curing mat of the present invention. , Moisture is stored in the water retaining member of the wetting mat. As a result, the surface of the cast concrete can be kept in a wet state, and can be wet-cured.

As described above, the mat for concrete curing of the present invention has both a heat insulating / heat retaining function and a wetting function,
Allows heat and moisture curing of cast concrete.

Further, since the concrete curing mat of the present invention is easy to install and can be removed easily, it is excellent in workability. Further, by simply connecting the unit mats, it can be applied to various forms of curing surfaces from a relatively small area to a large area, and is excellent in versatility.

[0012]

EXAMPLE 1 FIG. 1 is a schematic sectional view of Example 1 showing the most basic constitution of the mat for concrete curing of the present invention.

The concrete curing mat 1 according to the illustrated embodiment includes a heat insulating mat 100 and a wetting mat 11.
It consists of 0 and.

The heat insulating mat 100 comprises a heat insulating member 10 in the form of a long mat, and a bag-like waterproof sheet member 20 enclosing the outer periphery of the heat insulating member 10.
The wetting mat 110 is composed of a water retaining member 60 and a water permeable sheet member 70.

As a material for the heat insulating member 10, a small block body obtained by crushing a foam of synthetic resin such as glass wool, polyurethane, polystyrene, polypropylene and polyvinyl chloride can be preferably used. Although the thickness of the heat insulating member 10 varies depending on the heat insulating property of the heat insulating member 10, for example, when glass wool is used as the heat insulating member, it is preferably about 20 to 100 mm.

The material of the waterproof sheet member 20 is polyethylene, polyvinyl chloride, nylon,
A synthetic resin such as polypropylene can be used. The waterproof sheet member 20 may have a reinforcing member such as a woven fabric inside the sheet in order to increase its mechanical strength. Further, a metal such as aluminum may be vapor-deposited on the surface of the waterproof sheet member 20 in order to enhance the heat insulating effect.

Materials for forming the water retaining member 60 include sponge, woven fabric, non-woven fabric of chemical fiber, and super absorbent resin having a function of absorbing and retaining water. The water retention and water retention properties of the water retention member 60 need to be such that a part of the water content from the pouring concrete by breathing can be accumulated on the surface of the pouring concrete to maintain a moist state. is there. However, if the water absorption and the water retention are too high, the absorbed water reduces the heat insulating effect. Considering these points, the thickness of the water retention member 60 is preferably about 10 to 30 mm.

As a material forming the water permeable sheet member 70, there is a chemical fiber non-woven fabric such as polypropylene non-woven fabric. The water permeability of the water permeable sheet member 70 allows water from the concrete to pass therethrough to be stored in the water retaining member 60. There is no particular limitation as long as it is a degree.

The size of the heat insulating mat 100 is not particularly limited, but preferably 2 m × 30 m, more preferably 1 m × 20 m in view of workability, carrying-out / transporting property, storability and the like.
It is about m. On the other hand, the wetting mat 110 has the same size as that of the heat insulating mat 100.
00 and the wetting mat 110 are joined by an adhesive, a double-sided tape, a magic tape (trademark) or the like (not shown). The heat insulating mat 100 and the wetting mat 110 are joined in a factory, and the completed concrete curing mat 1 is wound up and transported to a concrete placing site so that it can be easily transported. Spread the mat 1 on the surface of the cast concrete and lay it.

Insulating mat 100 and wetting mat 110
In order to prevent the heat insulating member 10 and the water retaining member 60 from being biased, the sewn portions 30 are formed at a plurality of locations. In order to prevent water from entering the sewn portion 30 of the heat insulating mat 100, the surface of the waterproof sheet member 20 is subjected to a water immersion preventing treatment such as coating with a synthetic resin or sticking an adhesive tape. It is preferable to set. Second Embodiment FIGS. 2 and 3 are a schematic plan view showing a second embodiment of the present invention and a sectional view taken along line III-III in FIG.

In this embodiment, the basic structure is the same as that of the first embodiment, but the clip mounting portion 44 is formed along the width direction of the heat insulating mat 100, and the wetting mat. Reference numeral 110 denotes a clip mounting portion 44 and a mat mounting portion 4 which will be described later on one side of the heat insulating mat 100.
It is characterized in that it is fixed only to the part where 0 is not formed.

The clip mounting portion 44 is composed of a strip-shaped portion which is thinner than the other portions, and such a clip mounting portion 44 is constituted by forming the sewn portions 30 in the width direction at predetermined intervals, for example. Further, at both ends of the heat insulating mat 100, mat mounting portions 40 configured by adhering the ends of the waterproof sheet member 20 are provided. The mat mounting portion 40 is provided with a proper number of mounting holes 42. The heat-insulating mat 100 can be fixed to the formwork or other fixing member by a string-like member, a hook or the like through the mounting hole 42.

Concrete curing mat 1 of this embodiment
Is, for example, as shown in FIG.
The clip attaching portion 44 is bent along the outside of the U-shaped clip 4 from the outside of the clip attaching portion 44.
By mounting 8 and fixing the clip attachment portion 44 to the rib 310, the clip attachment portion 44 is reliably fixed to the mold 300 at a plurality of locations. Third Embodiment FIG. 5 is a schematic plan view showing a third embodiment of the present invention.

A feature of this embodiment is that the mat connecting portion 50 is provided along the longitudinal end of the heat insulating mat 100.
Is formed and is not shown in FIG.
10 is fixed to a portion of one surface of the heat insulating mat 100 where the mat connecting portion 50 is not formed. The connecting portion 50 is formed by a protruding ear-like member in which a heat insulating member is interposed with a smaller thickness than other portions, or is not interposed, and the mat connecting portion 50 is provided with a plurality of connecting members 52 at predetermined positions. There is. This connecting member 52
For example, Velcro tape (trademark), double-sided tape, or the like can be used.

In the concrete curing mat 1 having the above-mentioned structure, the connecting member 52 formed on the mat connecting portion 50 of the heat insulating mat 100 is joined to the connecting member 52 of the adjacent heat insulating mat 100 to insulate it. Mat 100
Can be connected to each other in the longitudinal direction. As a result, it is possible to suppress the circulation of outside air through the gaps between the heat insulating mats 100, and to further enhance the heat insulating effect. Fourth Embodiment FIG. 6 is a schematic diagram showing a fourth embodiment of the present invention.

In this embodiment, the mat 1 for concrete curing is used.
It is characterized by the fixing method. In this embodiment, the concrete curing mat 1 is directly fixed to the concrete layer 200 by the pin member 46. With such a configuration, the heat insulating member 10 of the heat insulating mat 100 is displaced from the waterproof sheet member 20, the water retaining member 60 of the wetting mat 110 is displaced from the water permeable sheet member 70, and the concrete curing mat is used. 1 can be fixed simultaneously by the pin member 46.

The pin member 46 does not require waterproofing at the time of rainfall or breathing by applying an adhesive to the joint surface of the head portion 46a with the waterproof sheet member 20. Further, for example, butyl rubber (not shown) is bonded between the waterproof sheet member 20 and the water permeable sheet member 70, and the pin member 46 is penetrated through the butyl rubber to fix the concrete curing mat 1. As a result, it is possible to prevent the water stored in the water retaining member 60 from soaking into the heat insulating member 10.

Although the concrete curing mat 1 of the present invention has been described above with reference to several embodiments, the present invention is not limited to this and various modifications can be made. For example, the fixing means, shape, size, material, etc. of the curing mat can be changed in design depending on the purpose.

FIG. 7 shows that the concrete curing mat 1 of the present invention is applied to mass concrete such as a dam,
It is a schematic diagram showing the state of performing adiabatic wet curing. In FIG. 7, the mold 300 is shown in a plan view with the reinforcing members such as ribs and the connecting portions omitted, and the head portion thereof is shown in a broken state. Furthermore, excess water of the poured concrete is exposed to the outside. A hole (not shown) is formed so as to flow out.

The concrete curing mat 1 of the present invention comprises:
It is roughly classified into a method of horizontally attaching to the upper surface of the concrete layer 200 and a method of vertically attaching to the surface of the mold 300.

That is, when the concrete layer 200 is laterally attached to the concrete layer 200, the concrete curing mat 1 is unfolded while directly covering the surface of the concrete layer 200, and an appropriate fixing means such as a pressing member 60 is used. Then, the concrete curing mat 1 may be fixed. In addition, when attaching the concrete curing mat 1 to the surface of the mold 300 in the vertical direction, the attachment member of the concrete curing mat 1 is fixed to an appropriate position of the mold 300, and if necessary, such as a double-sided tape. The concrete curing mat 1 can be attached by connecting the concrete curing mat 1 and the form 300 by the joining means.

When the concrete curing mat 1 is attached in the lateral direction, since the surface of the concrete layer 200 and the wetting mat 110 are in contact with each other, a part of the moisture from the concrete layer 200 due to breathing is wet. It is absorbed by the water retaining member 60 of the mat 110 for water retention. Further, when the concrete curing mat 1 is attached to the surface of the mold 300 in the vertical direction, the water content of the concrete layer 200 flowing out from the holes formed in the mold 300 is the water retention member of the wetting mat 110. It is absorbed by 60 and retained.

Thus, the water stored in the water retaining member 60 is hard to evaporate because the waterproof sheet member 70 covers the surface thereof. As a result, for a long period of time, the surface of the concrete layer 200 is kept moist and is kept warm by the heat insulating mat, so that stable heat insulating and moisture curing can be performed.

[0034]

According to the concrete curing mat of the present invention, since the heat insulating mat and the wetting mat are combined with each other, the reliable heat insulating and heat retaining action and the water retaining action can be maintained for a long time. .

Moreover, since it has a relatively simple structure, it is easy to attach and detach, and it is excellent in versatility.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a first embodiment of the present invention.

FIG. 2 is a schematic plan view showing a second embodiment of the present invention.

FIG. 3 is a schematic sectional view taken along line III-III of the embodiment shown in FIG.

FIG. 4 is a schematic partial cross-sectional view showing a state where the concrete curing mat shown in FIGS. 2 and 3 is installed in a mold.

FIG. 5 is a schematic plan view showing a third embodiment of the present invention.

FIG. 6 is a schematic plan view showing a fourth embodiment of the present invention.

FIG. 7 is a schematic perspective view showing a state in which the concrete curing mat of the present invention is installed.

[Explanation of symbols]

 1 Concrete Curing Mat 10 Heat Insulating Member 20 Waterproof Sheet Member 60 Water Retaining Member 70 Water Permeable Sheet Member 100 Insulating Mat 110 Wetting Mat

Claims (3)

[Claims] 1. A heat insulating mat having a heat insulating member and a waterproof sheet member covering the periphery of the heat insulating member, and a wetting mat provided on one surface of the heat insulating mat,
A mat for concrete curing characterized by containing. 2. The concrete curing mat according to claim 1, wherein the heat insulating member is an aggregate of heat insulating materials in the form of fibers or small blocks. 3. The concrete curing mat according to claim 1, wherein the wetting mat comprises a water retaining member and a water permeable sheet member that surrounds the water retaining member.