JPH074030A - Concrete construction method - Google Patents

Abstract

PURPOSE:To improve a concrete construction environment, and prevent the generation of cold joints or cracks on the surface of the concrete. CONSTITUTION:New concrete 3 is placed on the top of an existing concrete 1. Nozzles 8 are installed on the top of the new concrete 3. Aqueous particles W, which are approximately 100mum or less than 100mum-sized, are sprayed from the nozzles 8 when the concrete is placed. Since the concrete 3 is cured in a moist atmosphere, no cold joint or crack is produced on the surface of the concrete.

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 in particular, a concrete construction method in which cold joints or cracks do not occur on the concrete surface during placing and curing of concrete. It is about.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
When placing concrete in the summer, or curing the placed concrete, the surface of the placed concrete is exposed to direct sunlight, and especially in fine weather, the drying of the surface portion of the concrete progresses rapidly. Sometimes. Thus, cold joints and cracks may occur in the concrete. Further, when the concrete that has been cast is subjected to strong sunlight and heat during curing, a temperature difference occurs between the inside and outside of the concrete, which often causes cracks on the surface of the concrete.

Therefore, conventionally, the surface of the concrete after casting is sprinkled with a sprinkler or the like, or flooded, or the surface of the concrete is covered with a sheet or a curing mat so that the direct sunlight is not exposed. It is designed to prevent sudden drying of the concrete surface and to prevent cracks on the concrete surface. However, in the case of a concrete structure constructed by concrete lift-casting, the above-mentioned submerged curing device and the covered sheet are used for the preparation work such as surveying and bar arrangement for the next lift-casting. Alternatively, since the curing mat is often removed one or several days after the concrete is poured, this measure cannot sufficiently achieve the purpose. In addition, in the case of the water sprinkling, rain gear or the like is required, and the working environment is extremely bad.

Therefore, there arises a technical problem to be solved in order to place a concrete in a good working environment and to prevent the cold joint and the crack from being generated. It aims to solve problems.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed in order to achieve the above-mentioned object, and is approximately 100% on the top surface of cast concrete or concrete being cast.
The present invention provides a method for constructing concrete in which water particles having a size of 100 μm or less are sprayed to cure the cast concrete or the concrete being cast in a wet atmosphere.

[0006]

According to the present invention, approximately 100 μm of water particles are sprayed from the top surface of the cast concrete or the concrete being cast to cure the cast concrete or the concrete being cast in a humid atmosphere. Therefore, the surface of the concrete is not rapidly dried even when exposed to direct sunlight, and the temperature difference between the inside and the outside of the concrete is prevented. Thus, the occurrence of cold joints and cracks on the concrete surface is prevented. Further, since water particles having a size of about 100 μm or less than 100 μm do not get wet even when they are directly bathed, the worker does not need rain gear and the concrete can be constructed in a good working environment.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIG. In the figure, 1 is concrete that has already been cast, and concrete is newly cast on the top surface of the concrete 1 and lifted up, which is often seen in mass concrete construction and the like.

Reference numeral 2 denotes a mold which is assembled on the existing concrete 1, and concrete 3 is newly placed on the existing concrete 1 in the mold 2. When placing the concrete 3, the reinforcing bars 4, 4, ... Are arranged on the existing concrete 1, or the pillars 5, 5 are erected and the pillars 5, 5 ,. Tread 6,
6 are mounted so that an operator can work on the treads 6, 6. Therefore, the columns 7, 5 ... Are tied to the columns 7, 7 ... And the columns 7, 7 ...
Or nozzle 8,8 which can spray water particles of 100 μm or less
... install. Alternatively, among the reinforcing bars 4, 4, ..., Vertical reinforcing bars may be arranged so as to project to the upper surface of the form 2, and the nozzles 8, 8, ... May be attached to the upper portions of the reinforcing bars 4, 4. Further, the columns 7, 7 may be directly erected on the existing concrete 1 or attached to the form 2 without being tied to the columns 5, 5.

Further, after the concrete 3 is newly placed in the form 2, the columns 7, 7 ... May not necessarily 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. For spraying, the valves 11 and 11a may be opened and closed intermittently by using an interval timer or the like. Further, as the spraying device, a device capable of generating fine water particles W, W ... such as an ultrasonic humidifier or a steam humidifier may be used.

Since one embodiment of the present invention has the above-described construction, the formwork 2 is assembled on the already cast concrete 1 and the reinforcement is provided, and the columns 7, 7 ... Are erected. , And the nozzles 8, 8 ... Are attached to the upper portions of the columns, respectively.
The nozzles 8, 8 ... Are approximately 100 μm or 100 μm
is a special nozzle for spraying water particles W, W ... Of m or less, water and compressed air are supplied to the nozzles 8, 8 ... Via a water hose 9 and a compressed air hose 10, respectively, and the compressed The air causes water particles of about 100 μm or less than 100 μm to be sprayed on the upper surface in the mold 2.

Therefore, after the concrete 3 is newly placed in the mold 2, the water particles W, W ... Are sprayed immediately, or the water particles W, W are poured while the concrete 3 is being placed.
When W ... is sprayed, the surface of the concrete 3 is sprayed with water particles W of about 100 μm or 100 μm or less.
Covered in. In such a case, the surface of the newly placed concrete 3 or the concrete 3 being placed is not suddenly dried by direct sunlight, so that cold joints or cracks are not formed on the surface of the concrete 3. It will never happen. Moreover, the above-mentioned approximately 1
Since it is unlikely to get wet with water particles W, W ... Of 100 μm or less, the next setting preparation work can be performed during the spraying work, and the working environment is good.

The present invention can be modified in various ways without departing from the spirit of the present invention, and it goes without saying that the present invention extends to such modifications.

[0013]

As described in detail in the above-mentioned one embodiment, the present invention is approximately 100 μm or 100 μm on the upper surface of the concrete which is newly placed on the upper surface of the existing concrete or rock, or the concrete which is being placed. Since the following water particles are sprayed to cure the concrete in a humid atmosphere, the newly placed concrete or the concrete being placed is exposed to direct sunlight even in the summer, etc. Will not dry rapidly, or there will be no sudden temperature difference between the inside and outside of the concrete, so that no cold joints or cracks will form on the concrete surface, and there will be about 100 μm.
Since it does not get wet with water particles of m or 100 μm or less, no rain gear is required, and the working environment is good.

[Brief description of drawings]

FIG. 1 is a partially cutaway vertical cross-sectional view showing lift driving according to an embodiment of the present invention.

[Explanation of symbols]

 1 Existing concrete 2 Formwork 3 Newly placed concrete 7 Pillar 8 Nozzle W Water particles of about 100 μm

Claims (1)

[Claims] 1. A cast concrete or a concrete being cast in a wet atmosphere by spraying water particles of about 100 μm or less than 100 μm on the upper surface of the cast concrete or the concrete being cast. A concrete construction method characterized by being cured.