JP3752957B2 - Concrete cooling method for composite pier structure and concrete cooling device for composite pier structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for cooling concrete in a composite pier structure and a concrete cooling device in a composite pier structure for cooling and curing concrete placed around a steel pipe in a steel pier / concrete composite pier structure. .
[0002]
[Prior art]
For example, in road construction, when the route selection is a mountainous area, a high pier structure format is adopted in a valley or a river part. Steel pipe / concrete composite pier structures have been developed and put into practical use as construction methods and structural forms suitable for such construction conditions. In this structure, concrete is cast around a hollow steel pipe so that the concrete and the steel pipe are integrated, thereby ensuring the resistance to bending and shearing force, and attaining rapid construction and labor saving.
[0003]
However, in this method, since a large amount of concrete is continuously placed in the mold, a large amount of heat is generated when the concrete is hardened, and cracks may occur in the concrete due to temperature stress caused by this heat. Therefore, conventionally, cooling water is supplied into the hollow steel pipe, and the concrete is cooled and cured by heat exchange of this cooling water. However, there is a technical problem described below.
[0004]
[Problems to be solved by the invention]
That is, in the cooling method described above, heat exchange is required by filling the inside of the steel pipe, so that it takes a long time to feed the water until the inside of the steel pipe is full, and the water supply equipment is large. In addition, depending on the installation location, it took a great deal of money and time.
[0005]
SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and an object of the present invention is to provide a method for cooling concrete in a composite pier structure that can efficiently cool concrete with a small amount of cooling water and can be circulated. It aims at providing the cooling device of the concrete in a pier structure.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a concrete cooling method for a composite pier structure according to claim 1 of the present invention is a method for cooling concrete in a composite pier structure constructed by placing concrete around a plurality of steel pipes. A cooling method in which a cooling water is stored, a pump for pumping the cooling water in the recovery tank to the tops of the plurality of steel pipes, and a cooling pumped to the tops of the plurality of steel pipes by the pumps A plurality of branch pipes for branching water to the upper part of each steel pipe, a sprinkler pipe connected to each branch pipe and for spraying cooling water in a diffused state on the upper inner wall surface of each steel pipe, and a bottom portion of each steel pipe; Using a cooling device provided with a drain pipe connected to the recovery tank, and by operating the cooling device, the cooling water is sprayed in a diffused state on the upper inner wall surface of each steel pipe. Let the wall travel Flowed down as a wall, recovered from the bottom of each steel pipe to the recovery tank via the drain pipe, and the cooling water recovered in the recovery tank was sprayed again in a diffused state on the upper inner wall surface of each steel pipe, It is characterized by repeating the flow down the inner wall surface of the steel pipe to form a water wall .
According to the method for cooling concrete in the composite pier structure according to the present invention, the cooling water is sprayed in a diffused state on the upper inner wall surface of each steel pipe by the cooling device, and this cooling water is transmitted along the inner wall surface of each steel pipe to the water wall. The concrete that flows down and is placed on the outside of each steel pipe is cooled. The cooling water collected at the bottom of each steel pipe is sprayed again in a diffused state on the upper inner wall surface of each steel pipe by the cooling device, and this is repeated to cool the concrete outside each steel pipe. become.
[0007]
Moreover, the cooling method of the concrete in the composite pier structure of Claim 2 of this invention is a concrete cooling method in the composite pier structure of Claim 1, Comprising: Between the said collection tank and the said pump. A cooling tank is interposed, and the cooling water recovered in the recovery tank is cooled by the cooling tank .
According to the method for cooling concrete in the composite pier structure according to the present invention, the cooling water flowing down along the inner wall surface of each steel pipe is collected in the recovery tank and guided to the cooling tank, cooled in the cooling tank, and again each Water will be sprayed in a diffused state on the upper inner wall surface of the steel pipe.
Furthermore, the concrete cooling method in the composite pier structure according to claim 3 of the present invention is the concrete cooling method in the composite pier structure according to claim 1 or 2, wherein the water spray pipe moves in the vertical direction. The sprinkling pipe is moved up and down according to the concrete placement height .
According to the concrete cooling method in the composite pier structure according to the present invention , the cooling efficiency can be increased by sequentially moving the water sprinkling pipes according to the concrete placement height.
Furthermore, the concrete cooling device in the composite pier structure according to claim 4 of the present invention includes a pump for pumping the cooling water to the top of the steel pipe, and a plurality of branch pipes for branching the pumped cooling water to the upper portions of the plurality of steel pipes. , A sprinkler pipe connected to each branch pipe and sprayed in a diffused state toward the inner wall of the steel pipe, a drain pipe connected to the bottom of each steel pipe to discharge cooling water flowing down to the bottom, and a drain pipe And a cooling tank interposed between the pumping pump and the recovery tank, and water collected in the recovery tank is cooled through the cooling tank through the pump. It is characterized by being used as a circulation.
According to the concrete cooling system for a composite pier structure according to the present invention , cooling water is pumped up to the upper part of a plurality of steel pipes by a pump, and the pumped cooling water is guided to the upper part of each steel pipe via a branch pipe. Water is dispersed in the upper inner wall surface of each steel pipe through the water pipe, flows down the inner wall surface of each steel pipe as a water wall, and cools the concrete placed on the outside of each steel pipe. Cooling water collected at the bottom of each steel pipe is collected in a recovery tank through a drain pipe, led from the recovery tank to the cooling tank, cooled, and again led to the upper inner wall surface of each steel pipe by a pump. Through this, water is diffused in the upper inner wall surface of each steel pipe in a diffused state, and by repeating such a process, the concrete on the outside of each steel pipe is cooled.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows the overall configuration of a cooling device according to the present invention. In the figure, 1 is a plurality of hollow steel pipes erected on the ground, 2 is concrete placed around the hollow steel pipe 1, and the top of the steel pipe 1 in order from the bottom by a slide foam method, a jumping foam method, etc. A high pier that is integrated with each steel pipe 1 is constructed by being continuously driven up to.
[0009]
The cooling device includes a collection tank installed on the surface, that is, a water tank 3, a cooling tank 4 connected to the water tank 3, a pump 6 that pumps water from the cooling tank 4 to the top of the steel pipe 1 through a pumping pipe 5, A plurality of branch pipes 7 connected to the top of the pipe 5 and distributing cooling water to the upper part of each steel pipe 1, and a plurality of branch pipes 7 connected to the tip of each branch pipe 7 with the ejection surface directed toward the inner wall surface of the steel pipe 1 A water spray tube, that is, a nozzle gun 8 is provided.
[0010]
On the other hand, the bottom of each steel pipe 1 is filled with concrete, the bottom is watertightly covered, and communicates with each other through a drain pipe 9 on the top side, one of which is introduced to the water tank 3 side for heat exchange. The amount of water stored at the bottom after finishing the process is collected in the water tank 3. In addition, as the cooling tank 4, water cooling facilities, such as a cooling tower, are preferable, for example. Moreover, as the pump 6 for pumping water, the high pressure pump etc. which are used in order to lift high pressure water to a high place are preferable.
[0011]
In the above configuration, the cooling water pumped up by the pump 6 is jetted in a diffused manner toward the inner wall surface of each steel pipe 1, and then adheres to the inner wall surface and becomes a water wall along the inner wall surface. Flow down. The water stored in the bottom is supplied again to the water tank 3 side through the drain pipe 9 and cooled through the cooling tank 4, and then circulated and used again as cooling water.
[0012]
In the above cooling system, the steel pipe 1 functions as a heat transfer surface for heat exchange, so that the water wall flowing down while continuously in contact with the surface continuously takes heat away from the surface of the steel pipe 1, The concrete 2 is cooled.
[0013]
In the conventional full-water type cooling system, the cooling water stays in the pipe, so the temperature rises with the temperature rise of the concrete, so the cooling efficiency is low. Since the cooling water is sequentially supplied with new cooling water while performing heat exchange, the cooling efficiency is high.
[0014]
The position of the nozzle gun 8 is not fixed to the uppermost part, but the cooling efficiency can be further improved by adopting a configuration in which the nozzle gun 8 is sequentially moved upward according to the concrete placement height.
[0015]
【The invention's effect】
As is apparent from the above description, according to the concrete cooling method for a composite pier structure and the concrete cooling device for a composite pier structure according to the present invention , the concrete can be efficiently cooled with a small amount of cooling water and can be used in a circulating manner. Therefore, it is suitable as a cooling method and a cooling device for cooling and curing concrete in places where water resources are scarce, such as mountainous areas.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing the whole of an embodiment of a concrete cooling method in a composite pier structure and a concrete cooling device in a composite pier structure according to the present invention.

Claims (4)

A method for cooling concrete in a composite pier structure constructed by placing concrete around a plurality of steel pipes,
A recovery tank in which cooling water is stored, a pump for pumping the cooling water in the recovery tank to the tops of the plurality of steel pipes, and cooling water pumped to the tops of the plurality of steel pipes by the pumps A plurality of branch pipes branched to the upper part, a sprinkler pipe connected to each branch pipe and sprinkling cooling water on the upper inner wall surface of each steel pipe in a diffusion state, and between the bottom of each steel pipe and the recovery tank Using a cooling device with a drain pipe connecting the
By operating the cooling device, the cooling water is sprinkled on the upper inner wall surface of each steel pipe in a diffused state, is transmitted along the inner wall surface of each steel pipe to become a water wall, and drains the water from the bottom of each steel pipe. The cooling water collected in the collection tank is sprinkled on the upper inner wall surface of each steel pipe in a diffusing state again through the pipe, and then flows down the inner wall surface of each steel pipe to become a water wall. A method for cooling concrete in a composite pier structure characterized by repeating the above . 2. The cooling of concrete in the composite pier structure according to claim 1, wherein a cooling tank is interposed between the recovery tank and the pump, and cooling water recovered in the recovery tank is cooled by the cooling tank. Way . 3. The concrete in a composite pier structure according to claim 1, wherein the water spray pipe is configured to be movable in the vertical direction, and the water spray pipe is moved in the vertical direction according to a placement height of the concrete. Cooling method . A pump for pumping the cooling water to the top of the steel pipe, a plurality of branch pipes for branching the pumped cooling water to the top of the plurality of steel pipes, and a sprinkling pipe connected to each branch pipe and sprinkling in a diffused state toward the inner wall of the steel pipe A drain pipe connected to the bottom of each steel pipe to discharge the cooling water flowing down to the bottom; a recovery tank connected downstream of the drain pipe; and between the pump and the recovery tank A cooling apparatus for concrete in a composite pier structure, comprising: an intervening cooling tank , wherein water collected in the collecting tank is circulated and used as cooling water through the pump via the pump.

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