JP2854218B2 - Concrete construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete construction method and, more particularly, to a concrete construction method in which a cold joint or a crack is not formed on the concrete surface during concrete placement and curing. It is about.

[0002]

2. Description of the Related Art
When casting concrete or curing the poured concrete in the summer, etc., the surface of the poured concrete is exposed to direct sunlight, and especially in fine weather, the drying of the surface portion of the concrete proceeds rapidly. Sometimes. Thus, cold joints and cracks may occur in the concrete. Further, if the cast concrete is subjected to insolation or heat radiation during curing, a temperature difference occurs between the inside and outside of the concrete, and as a result, cracks often occur on the surface of the concrete.

Therefore, conventionally, the concrete surface after casting is sprinkled using a sprinkler or the like, or is subjected to flooding curing, or the concrete surface is covered with a sheet or a curing mat to expose the concrete surface to direct sunlight. It is designed to avoid rapid drying of the concrete surface by avoiding it, and to prevent cracks and the like from occurring on the concrete surface. However, in the case of a concrete structure constructed by carrying out concrete lift casting, the flooded curing device and the covered sheet are used for preparation work such as surveying and bar arrangement for the next lift casting. Alternatively, since the curing mat is often removed one to several days after the concrete is cast, this countermeasure cannot sufficiently attain the purpose. In addition, in the case of the above-mentioned water spray, rain gear and the like are required, and the working environment is extremely poor.

[0004] Therefore, there is a technical problem to be solved in order to cast concrete without improving the working environment and preventing the cold joints and cracks. The purpose is to solve the problem.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above-mentioned object.
It is an object of the present invention to provide a concrete construction method in which the poured concrete or the concrete being poured is cured in a humid atmosphere by spraying water particles of μm or 100 μm or less.

[0006]

According to the present invention, approximately 100 .mu.m of water particles are sprayed from the upper surface of the poured concrete or the concrete being poured to cure the poured concrete or the concrete being poured in a humid atmosphere. Therefore, the surface of the concrete does not dry rapidly even in direct sunlight, and a temperature difference between the inside and outside of the concrete is prevented. Thus, the occurrence of cold joints and cracks on the concrete surface is prevented. Further, since the water particles having a size of about 100 μm or less are not wetted even when directly immersed, the worker does not need rain gear and can perform concrete work in a favorable working environment.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIG. In the figure, reference numeral 1 denotes concrete that has already been cast. Concrete is newly placed on the upper surface of the concrete 1 and lifted up, and is often seen in mass concrete works and the like.

[0008] Reference numeral 2 denotes a formwork assembled on the existing concrete 1, and concrete 3 is newly cast on the existing concrete 1 in the formwork 2. When the concrete 3 is cast, the reinforcing bars 4, 4 are arranged on the existing concrete 1, or the pillars 5, 5,. Treads on top 6,
6 are mounted thereon, so that an operator can work on the treads 6, 6,. Therefore, the pillars 7, 7,... Are tied to the pillars 5, 5,.
Or a nozzle 8, 8 capable of spraying water particles of 100 μm or less.
Install…. Alternatively, among the rebars 4, 4,..., A vertical rebar may be arranged so as to protrude to the upper surface of the formwork 2, and the nozzles 8, 8,. The posts 7, 7,... May be directly erected on the existing concrete 1 without being bound to the legs 5, 5,.

After the new concrete 3 is cast into the formwork 2, the columns 7, 7... Do not necessarily have to be removed. Are connected to a water hose 9 and a compressed air hose 10, and the water hose 9 is connected to a pump (not shown) via a valve 11 and a flow meter 12. The compressed air hose 1
0 is connected to a compressor (not shown) via a valve 11a and a flow meter 12a. The spraying may be performed intermittently by opening and closing the valves 11, 11a using an interval timer or the like. Further, as the spraying device, an ultrasonic humidifier or a steam humidifier that can generate fine water particles W may be used.

Since the embodiment of the present invention has the above-described structure, the formwork 2 is assembled on the already-cast concrete 1 and the reinforcing bars are arranged, and the columns 7, 7,... , And the nozzles 8, 8...
.. Are approximately 100 μm or 100 μm.
m, and water and compressed air are supplied to the nozzles 8, 8,... through a water hose 9 and a compressed air hose 10, respectively. Water particles having a size of about 100 μm or less than 100 μm are sprayed on the upper surface of the mold 2 by air.

Then, immediately after the concrete 3 is poured into the formwork 2, the water particles W are sprayed immediately or the water particles W,
When the spraying of W ... is performed, the surface of the concrete 3 is sprayed with water particles W, W ...
Covered. In such a case, the surface of the newly poured concrete 3 or the concrete 3 being poured is not rapidly dried by the direct sunlight, so that the surface of the concrete 3 has no cold joints or cracks. Nothing will happen. Also, approximately 1
Since it is less likely to be wet by water particles W, W... Less than 00 μm or 100 μm, the next casting preparation work and the like can be performed even during the spraying work, and the working environment is good.

The present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

[0013]

As will be described in detail in the above-mentioned embodiment, the present invention can be applied to a concrete which is newly cast on the upper surface of existing concrete or a bedrock or a concrete which is approximately 100 .mu.m or 100 .mu.m Since the following water particles are sprayed to cure the concrete in a humid atmosphere, newly cast concrete or concrete during casting is exposed to direct sunlight even in summer or the like. Does not rapidly dry, or a sudden temperature difference between the inside and outside of the concrete does not occur, so that no cold joints or cracks occur on the concrete surface, and approximately 100 μm
The present invention does not require rain gear because it does not get wet by water particles of m or 100 μm or less, and the working environment is good.

[Brief description of the drawings]

FIG. 1 is an embodiment of the present invention, and is a partially cut-away vertical slope view showing lift placement.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Existing concrete 2 Formwork 3 Newly cast concrete 7 Prop 8 Nozzle W Water particle of about 100 μm

Claims (1)

(57) [Claims] 1. A method of spraying water particles having a size of approximately 100 μm or less on a top surface of cast concrete or concrete being poured into the concrete or the concrete being cast in a humid atmosphere. A concrete construction method characterized by being cured.