JP2002256705A - Curing protection device with function to sprinkle water over concrete and curing protection sheet for use therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply water to compensate for evaporation to prevent cracking of concrete by covering the top of a concrete foundation with a curing protection sheet to block sunlight, and sprinkling water from the underside of the sheet. SOLUTION: This curing protection device with the function to sprinkle water over the concrete to be cured has a water sprinkler hose 1 or 1' disposed in a position above the concrete for causing water to ooze out onto the concrete C from the outer surface of the hose. The hose and the concrete are covered with a curing protection sheet 2 which prevents solar heat from directly reaching the concrete C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curing protection device having a watering function for concrete required for curing concrete, and a curing protection sheet used for the device.

[0002]

2. Description of the Related Art Generally, concrete needs to be cured until it hardens sufficiently after being poured. This is because the quality of curing greatly affects the properties of concrete after hardening. However,
During concrete curing, the sunlight and the rise in outside temperature cause cracks in the concrete due to evaporation of water in the concrete. To elaborate on this point, concrete curing is a heat source generated by the hydration reaction of concrete.
It naturally dries and solidifies, but in summer, the rise in outside temperature and sunlight makes it very easy for water in the concrete to evaporate, which accelerates drying and partially uneven drying conditions. And cracks are likely to occur.

[0003] In winter, a sharp decrease in the temperature of concrete has had a bad influence on the curing of concrete. Therefore, effective curing assistance means is required to prevent cracks from entering the concrete due to sunlight in summer and to suppress a sharp decrease in the temperature of concrete in winter. Conventional curing assisting means include, for example, JP-A-11-324327 and JP-A-2000-179.
A means by watering as described in JP-A-155-155 was assumed. However, the former watering means
It is merely intended to automatically sprinkle the required amount of water at the determined time, it is difficult to equalize the sprinkling, and the water pressure tends to change especially in places near and far from the faucet, The problem remains that it is difficult to expect effective and uniform watering.

[0004] In the latter case, a water application mechanism used in a specified method called a slip form method, in which a concrete surface and a windshield hood exposed as the sliding formwork used in the method is raised. Because it is a water-gathering mechanism that sprays in between, it cannot be applied to concrete that performs general curing, and the problem that it is difficult to equalize the moisture with spray-type water-gathering still remains. Met.

Further, concrete is heated by utilizing low-temperature and low-pressure steam to promote curing of the concrete.
A curing system described in Japanese Patent Application Laid-Open No. 0-264756 has also been proposed. , The equipment becomes large, installation at the curing site becomes troublesome and costly,
It was difficult to adopt easily.

Accordingly, an object of the present invention is to prevent the above-described cracking of concrete, for example, by covering a sheet on an upper part of a concrete foundation to block sunlight, and by spraying water from below the sheet to reduce the moisture that evaporates. It is intended to replenish and prevent cracks in concrete.

[0007]

According to the present invention, there is provided a curing protection device with a watering function for concrete according to the present invention which can achieve the above object. A curing protection device with a watering function, wherein a watering hose capable of discharging water from the outer surface of the hose is disposed at least above the concrete, and at least a curing that prevents sunlight from directly reaching the concrete. The sprinkler hose and the concrete are covered with a protective sheet, which is characterized by being covered.

[0008] According to the first aspect of the present invention,
Since the watering means is provided at least at a position above the concrete so that the water can be discharged from the outer surface of the hose, the watering on the concrete is suitable for equalizing the watering. And concrete is at least covered with a curing protection sheet that prevents sunlight from reaching the concrete directly, so it can block the effects of sunlight and maintain the temperature and sufficient moisture necessary for concrete curing. And good curing can be realized.

Next, according to the second aspect of the present invention, a watering hose is provided between the vertical outer peripheral surface of the mold and the curing protection sheet. Cooling is also performed from the outer peripheral surface of the formwork, so that curing of concrete can be further promoted.
In the case of the invention according to claim 3 which depends on claim 1 or 2, since the watering hose is formed in a porous structure in which water oozes from the outer surface of the hose, the watering hose is formed on concrete. In addition to being suitable for uniformly dispersing and spraying water, it is also possible to uniformly spray water on the outer peripheral surface of the mold as an additional water spray.

Similarly, in the case of the invention according to claim 4 which depends on claim 1 or 2, the watering hose is formed as a structure with pores for blowing water from one side of a flat hose. It is characterized by the fact that watering is once evenly distributed toward the inner surface of the upper part of the curing protection sheet, and then water is sprinkled on concrete. Can double as watering. In this case, the water is sprayed from one side of the hose. Therefore, when the water can be sprayed on the outer peripheral surface of the mold as described in claim 2, it is suitable for spraying water concentrated on the outer peripheral surface of the mold.

Next, the above-mentioned curing protection sheet is characterized in that it is configured to cover concrete for shading so that sunlight does not directly reach the concrete, and to cover a watering hose for the concrete. By using such a curing protection sheet in a curing protection device, sunlight can be blocked, and water can be sprinkled on the lower side of the sheet to replenish moisture that evaporates and prevent cracks in concrete.

Further, the curing protection sheet according to the invention of claim 6 which is dependent on claim 5 is a curing protection sheet comprising:
The light-shielding layer is formed by laminating a light-shielding layer on at least one surface of the waterproof sheet layer, and can not only block sunlight but also function as waterproof. The curing protection sheet according to claim 7 can cover concrete for shading and heat insulation so that sunlight, solar heat and outside air do not directly reach the concrete, and can cover a watering hose for the concrete. It is characterized in that it is configured, and can perform light-shielding and heat insulation to appropriately cure concrete.

In the case of the invention of claim 8 which depends on claim 7, the curing protection sheet is characterized in that it has at least a three-layer structure in which a synthetic resin sheet is laminated on both sides of a synthetic resin net. I have. In this case, light shielding and heat insulation can be reliably achieved. In particular, if the color of the synthetic resin sheet on the concrete side is set to black, it is effective to absorb solar heat better and prevent direct heat to concrete. Furthermore, in the case of the invention of claim 9 which depends on claim 7, the curing protection sheet is characterized in that it has at least a three-layer structure in which a synthetic resin cloth sheet is laminated on both sides of a heat insulating material made of a foamed sheet or a nonwoven fabric. And In this case, since the heat insulating material is interposed in the middle, a light-shielding heat-insulating sheet with further enhanced heat insulation is provided. Further, an aluminum foil layer can be added to one side of a foamed sheet or a nonwoven fabric, and in this case, a very high heat insulating effect can be obtained.

According to a tenth aspect of the present invention, there is provided a curing protection sheet according to any one of the fifth to ninth aspects, wherein at least a portion of the curing protection sheet that covers the formwork before and after the concrete is formed of a net having a light-shielding property, It is characterized by having air permeability, especially in the summer season, at least prevents the accumulation of steam between the formwork before and after the concrete and the curing protection sheet with a light-shielding net, and prevents airflow. And heat can be dissipated. The light blocking ratio of the net may be selected in consideration of the balance between heat radiation and light blocking.

Next, according to the invention described in claim 11 which depends on the above-mentioned claims 5 to 10, the backing of the curing protection sheet is provided with insertion portions for watering hoses at appropriate intervals. If the watering hose is inserted into the watering hose insertion part on the back of the light-shielding heat-insulating sheet and used as an integral part, the watering hose will loosely deviate from the curing protection sheet and shift from the position where water is to be sprayed on concrete. And a good watering condition can be maintained.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a light-shielding and heat-insulating apparatus with a water sprinkling function for concrete according to the present invention will be sequentially described with reference to the accompanying drawings. FIG. 1 shows an embodiment during curing of concrete, and FIG. 2 shows a curing protection sheet, wherein A and A 'are molds, C is concrete driven into molds A and A', Denotes a watering hose disposed above the concrete C, and 2 denotes a curing protection sheet that covers and hides the watering hose 1 and the concrete C. Reference numeral 20 denotes an insertion portion for a watering hose provided on the back side of the curing protection sheet 2, and reference numeral 25 denotes an eyelet hole through which a rope or the like can pass.

The watering hose 1 is made of a material having good compatibility in which a recycled rubber material and polyethylene are blended, and has a porous structure in which water oozes from the outer surface of the hose (trade name: seaper hose). It is not watered like a fountain or spray, but water is gradually oozing from the outer surface of the hose as sweat oozes out of the body and water is supplied to concrete C. And time can be controlled.

Further, according to the watering hose 1 'of another embodiment, the fine holes 1 for discharging water from one side of the flat hose are provided.
FIG. 7 shows the structure formed in the structure with 0 '.
In addition, on the back surface of the curing protection sheet 2, FIG.
As shown in the figure, a penetration part 20 for a watering hose is provided at a predetermined interval, and this penetration part 20 is composed of a pile piece 20a and an entanglement needle piece 20b which can be fixed to the pile piece 20a. These are wound around the watering hose 1 and entangled with each other so that an annular insertion portion 20 can be formed. The watering hose 1 and the light-shielding heat-insulating sheet 2 are combined so as not to be unnecessarily removed.

3 to 5 showing the structure of the curing protection sheet 2.
Will be described later. Figure 6 shows an example of a watering system using the watering hose 1, large couplers having a timer T of accommodating box B for control via the pressure hose H ₁ from the faucet coupler K which contact the water source F, through the following pressure hose H ₂ through F, large couplers F bifurcation, F ...... branched from sprinkler hose 1 through the stop valve S ₁ from the individual pressure hose H ₃ (e.g. length 15
m), a sprinkling hose 1 of a required length (for example, 15 m) and a small coupler interposed between the sprinkling hoses 1, and S ₂ a stop valve.

As an example of the amount of water evaporated and the amount of water supplied to the concrete, in the case of a concrete foundation area of 70 m × 0.2 = 14 m ² , the outside air temperature is 25 ° C., 30 ° C., 35 ° C.
Required the following changes.

[0021]

[Table 1]

The curing protection sheet 2 which covers concrete for light shielding so that sunlight does not directly reach the concrete and also covers a watering hose is provided on at least one surface of the waterproof sheet layer 25 with light shielding. An example in which the layers 26 are stacked can be given (see FIG. 3). Next, as a curing protection sheet according to another embodiment, the concrete is covered for light shielding and heat insulation so that sunlight and solar heat and the outside air do not directly reach the concrete, and the watering hose can be covered. Specifically, in addition to a sheet (see FIG. 4) composed of at least three layers in which synthetic resin sheets 22 and 22 are laminated on both surfaces of a synthetic resin net 21 (see FIG. 4), a heat insulating material 23 made of a foamed sheet or a nonwoven fabric is formed on both surfaces. A heat insulation reinforced sheet (see FIG. 5) having at least a three-layer structure in which synthetic resin cross sheets 24, 24 are laminated is preferable, and has a total thickness of about 0.3.
About 0.4 mm is preferable, and the overall size is 4 × 1.8 m, 1.8 × 1.5 m, 2 × 1.8 m, etc., and various specific examples of the material will be described below. It is shown.

It should be noted that an aluminum foil or an aluminum layer formed by vapor deposition may be added to the foamed sheet or the nonwoven fabric so that the heat insulating effect is further enhanced. Alternatively, a curing protection sheet 2 'formed on a net N having a light-shielding property only in a portion covering the vertical outer peripheral surfaces of the mold frames A and A' can be used (see FIGS. 8 (2) and 9 (2)). Light-shielding sheet-A two-layer structure in which an EVA-based sheet is laminated on one side (back side) of a PET-based sheet-A two-layer structure in which an EVA-based sheet is laminated on one side (back side) of a PP-based sheet, which also serves as a waterproof sheet.

EVA Cloth (EVA Tarpaulin) The content of vinyl acetate in EVA (ethylene-vinyl acetate copolymer) is preferably 20 to 30% by weight. Implementation is 2
5% by weight. Increasing the content of vinyl acetate increases flexibility but decreases strength. -A three-layer structure in which EVA-based sheets are laminated on both sides of a PET-based net.・ EVA sheet laminated on both sides of PP net 3
Layered structure. The color of the EVA sheet is preferably black (concrete facing side).

PE-based cloth A three-layer structure in which a PE (polyethylene) -based sheet is laminated on both sides of a PET (polyethylene terephthalate) -based net. A three-layer structure in which PE-based sheets are laminated on both sides of a PP (polypropylene) -based net. The color of the PE-based sheet is preferably black (concrete facing side).

VC-based cloth-A three-layer structure in which a VC (vinyl chloride) -based sheet is laminated on both sides of a PET-based net. -A three-layer structure in which VC sheets are laminated on both sides of a PP net. The color of the VC sheet is preferably black (concrete facing side).

Heat insulation reinforced sheet A three-layer structure in which the same type of cloth sheet is laminated on both sides of a heat insulating material, or a four-layer structure in which a synthetic resin sheet is added thereto. Insulation material ・ Polyethylene-based foam ・ Aluminum-deposited polyethylene-based foam ・ Non-woven fabric cloth sheet ・ EVA cloth ・ or PE cloth ・ or VC cloth The physical properties of the curing protection sheet are shown below.

[0028]

[Table 2]

The measurement results of the light shielding ratio and the transmission Lx of the curing protection sheet are shown below.

[0030]

[Table 3]

Further, in the summer, the hot air accumulates between the curing protection sheet and the concrete formwork covered with the curing protection sheet, and humidification may adversely affect the curing of the concrete. In this case, at least a portion of the curing protection sheet that covers the formwork before and after the concrete is formed of a net having a light-shielding property, and this portion is allowed to have air permeability, thereby preventing stuffiness due to hot air. As a net having a light-shielding property, a knitted net or a woven net having a light-shielding rate of about 20% to 80%, desirably 30% to 60% as shown in FIGS. 8 (2) and 9 (2) described later. And cold gauze are suitable.

Further, when the watering hose is made of a porous structure in which water oozes from the outer surface, the watering hose is provided at a position above the concrete inside the curing protection sheet, and the outside of the molds A and A 'is also shielded from the light. In the case where the sheet is covered with a curing protection sheet 2 of the same mode by a sheet or a light-shielding heat-insulating sheet (see FIG. 8A), the curing protection sheet 2 formed of a net N having a light-shielding property only outside the formwork A, A '. (See FIG. 8 (2)).
In this case, the upper part of the concrete, which is the other part, may be a light-shielding sheet that also serves as a mere waterproof as described above, or may be a light-shielding heat-insulating sheet that also serves as a waterproof. The latter is suitable in winter. Note that the light blocking ratio of the net portion may be appropriately selected in consideration of the balance between the heat radiation by the ventilation and the light blocking.

When another watering hose is used, which is formed in a perforated structure for discharging water from one side of a flat hose, not only the upper part of the concrete but also the formwork A, It is also provided between the vertical outer peripheral surface of A 'and the curing protection sheet 2 to discharge water to the outside of the formwork A and A' to cool the formwork and promote concrete curing. (Fig. 9
(See (1)). Even in the case of using such a watering hose, when the outside of the mold is also covered with the curing protection sheet 2 in the same mode using the above-mentioned light-shielding sheet or light-shielding heat-insulating sheet (see FIG. 9A), There is a case (see FIG. 9 (2)) in which the outer side of the molds A and A 'is covered with a curing protection sheet 2' formed of a net N having a light-shielding property (see FIG. 9 (2)). The upper portion of the concrete may be a light-shielding sheet that also serves as a mere waterproof as described above, or may be a light-shielding heat-insulating sheet that also serves as a waterproof, and the latter is suitable in winter.

[0034]

According to the present invention, water can be sprinkled by equalizing water to concrete with a watering hose, and the water supply required for curing can be properly achieved.
In addition, the curing protection sheet that covers and covers the watering hose and the concrete can avoid direct sunlight on the concrete, and can at least achieve good shading. In particular, it can properly cure in the summer season, and the use of a watering hose and a curing protection sheet in a simple and easy-to-use configuration can surely prevent the occurrence of cracks in concrete.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a use state during construction.

FIGS. 2 (1) and (2) are plan views showing the back side of a curing protection sheet.

FIG. 3 is a sectional view of a curing protection sheet.

FIG. 4 is a cross-sectional view showing a modified example of the curing protection sheet.

FIG. 5 is a sectional view showing a modified example of the curing protection sheet.

FIG. 6 is a schematic diagram showing an example of a watering system using a watering hose.

FIG. 7 is a partially cutaway perspective view showing a modified example of a watering hose.

FIGS. 8A and 8B are schematic sectional views at the time of implementation.

FIGS. 9A and 9B are schematic cross-sectional views when a change is made.

[Explanation of symbols]

 Reference Signs List A, A 'Formwork C Concrete 1, 1' Watering hose 2, 2 'Curing protection sheet N Net covering part of outer periphery of formwork 20 Penetration part for watering hose 20a Pile piece 20b Entangling needle piece 21 Within three-layer structure Net 22 Synthetic resin sheet 23 Insulation material 24 Cross sheet

Claims (11)

[Claims] 1. A curing protection device having a watering function for concrete to be cured in a formwork, wherein a watering hose capable of discharging water from an outer surface of the hose is disposed at least above the concrete. A curing protection device with a sprinkling function for concrete, characterized in that the sprinkling hose and the concrete are covered with at least a curing protection sheet for preventing sunlight from directly reaching the concrete. 2. A sprinkling hose is provided between the vertical outer peripheral surface of the mold and the curing protection sheet.
Curing protection device with watering function as described. 3. The device according to claim 1, wherein the watering hose is formed in a porous structure in which water oozes from the outer surface of the hose. 4. The device according to claim 1, wherein the watering hose is formed in a structure having a fine hole through which water is blown out from one side of a flat hose. . 5. A curing protection sheet for concrete, wherein the sheet is covered so as to block light so that sunlight does not directly reach the concrete, and is capable of covering a watering hose for concrete. 6. The curing protection sheet for concrete according to claim 5, wherein the curing protection sheet is formed by laminating a light-shielding layer on at least one surface of a waterproof sheet layer. 7. A light-shielding device characterized in that it is configured to cover concrete for light-shielding and heat insulation so that sunlight, solar heat and outside air do not directly reach the concrete, and to cover a watering hose for concrete. Curing protection sheet against concrete for heat insulation. 8. The curing protection sheet for concrete according to claim 7, wherein the curing protection sheet has at least a three-layer structure in which a synthetic resin sheet is laminated on both sides of a synthetic resin net. 9. The curing method for concrete according to claim 7, wherein the curing protection sheet has at least a three-layer structure in which a synthetic resin cross sheet is laminated on both sides of a heat insulating material made of a foamed sheet or a nonwoven fabric. Protection sheet. 10. The curing protection sheet according to claim 5, wherein at least a portion covering the formwork before and after the concrete is formed of a net having a light-shielding property so as to have air permeability. Curing protection sheet for concrete according to. 11. The curing protection sheet for concrete according to claim 5, wherein an insertion portion for a watering hose is provided at an appropriate interval on the back surface of the curing protection sheet.