JP3606796B2 - Concrete curing equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention generally relates to a concrete curing device. More specifically, the present invention relates to a concrete curing device that can efficiently lower the temperature in the curing device to a temperature substantially equal to the outside air temperature at the end of curing.
[0002]
[Prior art]
Concrete products such as fume pipes, piles, box culverts, panels, etc. are manufactured in concrete curing equipment in order to promote the hardening action and prevent cracking due to drying after putting concrete into a predetermined formwork. It is housed and cured. Concrete curing is generally performed in a concrete curing device by first increasing the temperature at a predetermined temperature increase angle, holding a constant temperature for a predetermined time, and then decreasing the temperature at a predetermined temperature decrease angle, Done.
[0003]
In recent years, concrete curing devices have significantly improved thermal insulation performance in order to reduce fuel costs, and it is not easy to lower the temperature in the device.
[0004]
[Problems to be solved by the invention]
However, when the temperature inside the device does not drop sufficiently and the concrete product is taken out of the curing device with a large temperature difference from the outside air temperature, hair cracks (fine cracks) are generated in the concrete product. There is.
[0005]
On the other hand, attempts have been made to lower the temperature in the curing device by spraying water on the floor surface of the curing device. However, sprinkling water causes work costs, and the floor surface is drenched, the formwork contains moisture, and water drops fall off. In particular, in a cold region, freezing damage occurs, so such a convenience method is not adopted.
[0006]
Under such circumstances, there is a strong demand for a device that can efficiently lower the temperature in the curing device to a temperature substantially equal to the outside air temperature at the end of curing. Therefore, an object of the present invention is to provide a concrete curing device capable of forming a temperature environment substantially equal to the outside of the device at the end of curing.
[0007]
[Means for Solving the Problems]
The concrete curing device according to claim 1 of the present invention includes a main body that stores a concrete product to be cured, a steam pipe that is disposed in a lower portion of the main body, and supplies steam into the main body, and an upper portion of the main body. And a steam discharge pipe for discharging the steam in the main body, and a solenoid valve is arranged in the steam discharge pipe, and is arranged in the lower part inside the main body to introduce outside air into the main body. Outside air introduction piping is provided, and outside air is introduced into the main body by the sirocco fan through the outside air introduction piping. When the sirocco fan is activated, the solenoid valve is opened and the sirocco fan is activated. When not, the electromagnetic valve is configured to be closed.
[0008]
The concrete curing apparatus according to claim 2 of the present application is the apparatus according to claim 1, wherein the outside air introduction pipe is arranged along the side wall of the main body, and a plurality of outside air discharge holes are provided at predetermined intervals. It is characterized by that.
[0009]
In the concrete curing device according to claim 3 of the present application, the operation and deactivation of the sirocco can be controlled so as to ventilate the main body in 1.5 to 2.5 hours in the device of claim 1 or 2. It is characterized by this.
[0010]
The concrete curing device according to claim 4 of the present invention is characterized in that, in the device of claim 1 or 2, the operation and deactivation of the sirocco can be controlled so as to ventilate the main body in 2 hours. is there.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, a concrete curing device according to a preferred embodiment of the present invention will be described with reference to the drawings. A concrete curing device according to a preferred embodiment of the present invention, indicated as a whole by the reference numeral 10 in FIG. The main body 12 typically has a cubic or rectangular parallelepiped box shape, and one of the side walls of the main body 12 has a door 14 for carrying in and out concrete products (in FIG. (Schematically illustrated).
[0012]
A steam pipe 16 is disposed in the lower part inside the concrete curing apparatus 10, and the steam pipe 16 communicates with a pressure reducing valve unit 20 disposed outside the concrete curing apparatus 10 via a pipe 18. Yes. The pressure reducing valve unit 20 is connected to a steam generation source (not shown). The pressure reducing valve unit 20 can reduce the steam pressure from the steam generation source to about ² kg / cm ² G to 0.5 kg / cm ² G, and supply high-quality steam with little moisture and large latent heat to the main body 12. .
[0013]
As shown in FIG. 1, the steam pipe 16 is preferably arranged in a “U” shape in plan view along three side walls of the four side walls of the main body 12 other than the side wall provided with the door 14. Yes. The steam pipe 16 is provided with a plurality of steam discharge holes 16a at predetermined intervals.
[0014]
A steam discharge pipe 22 is arranged on the upper portion of the concrete curing device 10 so that the steam in the main body 12 can be discharged outside the device. An electromagnetic valve 24 is installed in the steam discharge pipe 22.
[0015]
In the lower part of the inside of the concrete curing device 10, an outside air introduction pipe 26 is arranged. The outside air introduction pipe 26 communicates with the duct 30 via the pipe 28, and the end of the duct 30 extends to the outside of the concrete curing device 10.
[0016]
A sirocco fan 32 is provided in the middle of the duct 30. The sirocco fan 32 is interlocked with the electromagnetic valve 24 of the steam discharge pipe 22, and when the sirocco fan 32 is operated, the electromagnetic valve 24 is opened, and when the sirocco fan 32 is not operated, the electromagnetic valve 24 is closed. It has come to be.
[0017]
As shown in FIG. 1, the outside air introduction pipe 26 is preferably planar along three side walls other than the side wall provided with the door 14 among the four side walls of the main body 12, as shown in FIG. 1. It is arranged in a visual “U” shape. The outside air introduction pipe 26 is provided with a plurality of outside air discharge holes 26a at predetermined intervals.
[0018]
Next, the use of the concrete curing device 10 configured as described above will be described. First, the concrete product to be cured is carried into the concrete curing apparatus 10. Next, the steam decompressed to about ² kg / cm ² G to 0.5 kg / cm ² G by the pressure reducing valve unit 20 is discharged into the main body 12 from the steam discharge hole 16 a of the steam pipe 16. Then, the temperature in the main body 12 rises at a predetermined temperature increase angle, as indicated by A to B in FIG. Next, by adjusting the discharge of the steam, as shown in B to C in FIG. 2, a constant temperature is maintained for a certain time. Thereafter, the sirocco fan 32 is operated, and the outside air is uniformly introduced into the main body 12 through the outside air discharge hole 26a. When the sirocco fan 32 is operated, the electromagnetic valve 24 is opened, so that the temperature in the main body 12 gradually decreases as indicated by C to D in FIG. At this time, if the temperature in the main body 12 is suddenly lowered, hair cracks may occur in the concrete product. Therefore, the operation and deactivation of the sirocco fan 32 (therefore, opening and closing of the electromagnetic valve 24) should be performed. By repeating in small increments, the temperature in the main body 12 is gradually lowered (in FIG. 2, the CD is a straight line, but in reality, it is a fine step). And when the temperature in the main body 12 becomes substantially equal to the outside air temperature, the curing operation is finished, the door 14 is opened, and the concrete product is carried out. The sirocco fan 32 is operated and stopped by a known control means (not shown).
[0019]
According to various tests conducted by the inventor, the body 12 is ventilated for about 1.5 hours to about 2.5 hours (most preferably about 2 hours) (i.e., the air in the body 12 is It was found that it can be cured without generating hair cracks when it is exchanged with outside air for 1.5 hours to about 2.5 hours.
[0020]
The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say, it is something.
[0021]
【The invention's effect】
As described above, the outside air is uniformly introduced into the main body 12 from the outside air discharge hole 26a, and the operation and deactivation of the sirocco fan 32 and the opening and closing of the electromagnetic valve 24 are interlocked. Can be lowered slowly to a temperature substantially the same as the outside air temperature, so that hair cracks can be prevented from occurring in the concrete product.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view showing a concrete curing device according to a preferred embodiment of the present invention.
FIG. 2 is a graph showing the relationship between time and temperature in the main body of the concrete curing device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Concrete curing apparatus 12 Main body 14 Door 16 Steam pipe 20 Pressure reducing valve unit 22 Steam discharge pipe 24 Solenoid valve 26 Outside air introduction pipe 32 Siroc fan

Claims (4)

A concrete curing device,
A body that houses the concrete product to be cured;
A steam pipe arranged in the lower part of the inside of the main body and supplying steam into the main body;
It is arranged on the upper part of the main body and comprises a steam discharge pipe for discharging the steam in the main body, and a solenoid valve is arranged in the steam discharge pipe,
It is arranged in the lower part inside the main body, has an external air introduction pipe for introducing external air into the main body, and external air is introduced into the main body through the external air introduction pipe by a sirocco fan,
The device is configured such that when the sirocco fan is activated, the solenoid valve is opened, and when the sirocco fan is not activated, the solenoid valve is closed. The apparatus according to claim 1, wherein the outside air introduction pipe is disposed along the side wall of the main body, and a plurality of outside air discharge holes are provided at predetermined intervals. The apparatus according to claim 1 or 2, wherein the operation and deactivation of the sirocco can be controlled so as to ventilate the body within 1.5 to 2.5 hours. The apparatus according to claim 1 or 2, wherein the operation and deactivation of the sirocco can be controlled so as to ventilate the body in 2 hours.

Images