JPH06270128A - Concrete cooling equipment - Google Patents

Abstract

PURPOSE:To prevent the accumulation of mortar in white smoke in an exhaust duct by winding a heater around the upper part of the exhaust duct communicating with the white smoke removing hood arranged in opposed relation to the opening part of an agitator injecting liquefied gas and vertically falling through the bent upper part thereof and horizontally bent on the ground. CONSTITUTION:For example, a white smoke removing hood 40 is arranged to the lower part of the intermediate stage 20 of a cooling station 10 supplying liquefied nitrogen gas to the agitator of a concrete mixer vehicle C and the upper cylindrical part 40a thereof is inserted in an exhaust duct 44 in a slidable manner. The exhaust duct 44 is constituted by connecting a vertical pipe 44a, an upper horizontal pipe 44c and the vertical pipe 44d reaching the ground part along the side frame 12 of the cooling station 10 by elbows 44b and a heater is wound around at least the entire peripheries of the elbows 44b and the upper horizontal pipe 44c to be fixed thereto. The end part on the earth side of the vertical pipe 44d is connected to a white smoke removing device 46 by a horizontal pipe 44f.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete cooling facility, and more particularly to a concrete cooling facility which prevents clogging of an exhaust duct due to mortar components in white smoke discharged by cooling concrete.

[0002]

2. Description of the Related Art As a method for satisfactorily finishing construction of hot summer concrete or mass concrete, cooling concrete at the time of kneading with liquefied gas such as liquefied nitrogen gas,
There is a method in which the heat generated when the concrete is hardened is suppressed by placing the cooling concrete. And since the liquefied gas has extremely large latent heat and sensible heat for cooling, when manufacturing cooling concrete using the liquefied gas, efficient cooling can be performed with a small-scale facility, and Also, for example, even for concrete mounted on a concrete mixer truck or the like, there is an advantage that such concrete can be easily cooled.

A cooling station system, for example, has been proposed as specific equipment to which the cooling method using the liquefied gas is applied. As an example of means for cooling concrete during kneading, this method causes a concrete mixer truck to stop at a cooling station during the transportation of concrete, and a liquefied gas supply nozzle is inserted into the agitator through a hopper to supply the liquefied gas. While pouring, the agitator is rotated to cool the concrete to an appropriate temperature in a short time.

However, since the liquefied gas has a low boiling point and the vaporized gas also has a considerable sensible heat and is kept at an extremely low temperature, when the gas diffuses from the hopper to the outside, the surrounding air is rapidly cooled, and as a result, Fine water droplets, ice crystals, or dense white smoke mixed with this and fine mortar blows out from the hopper, obstructing the visibility of the surroundings, and obstructing the surrounding outdoor traffic, and also hindering the work of workers. It can be a cause of misunderstanding as a fire.

Therefore, in this type of equipment, it is necessary to install a device for removing white smoke in parallel with the liquefied gas supply device, and a hood that is opposed to and supported by the hopper of the agitator from the stage is arranged. It communicates with the duct, and leads to a device for removing white smoke installed on the ground surface side, for example, through the duct.

[0006]

However, in the conventional exhaust duct connected to the hood, as shown in FIG. 4, the vertical pipe 2 protruding above the cooling device 1 is connected to the upper horizontal pipe 3 via the curved pipe. Then, from here as well, it is connected to the vertical pipe 4 through a curved pipe, and through this, it is lowered to the ground part, and at this surface part, it is connected to the lower horizontal pipe 5 through the curved pipe, and this horizontal pipe 5
Since it is connected to the device 6 for removing white smoke through the concrete, especially in the part where the upper horizontal pipe 3 and the vertical pipe 4 are connected to the lower horizontal pipe 5, the concrete discharged in the white smoke is discharged. The mortar content of the mortar easily adheres to the inner peripheral wall of the duct in a low temperature state and easily accumulates. The accumulated mortar not only increases the flow resistance of white smoke in the duct, but also causes the duct to close if left unattended. There was a fear of being beaten.

Therefore, conventionally, it has been necessary to periodically disassemble the duct pipe to clean the inside of the connecting portion and the horizontal pipe, and maintenance has been extremely troublesome.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a concrete cooling facility capable of preventing the accumulation of mortar in the exhaust duct.

Another object of the present invention is to provide a concrete cooling facility which can easily remove the mortar that has flowed into the exhaust duct.

[0010]

In order to achieve the above object, the concrete cooling equipment of the present invention comprises a hood for removing white smoke, which is arranged so as to face an opening of an agitator into which liquefied gas is injected, In a concrete cooling facility having an exhaust duct that is vertically piped to the side of the agitator through an upper part that bends and has one end communicating with the upper part of the hood, and an exhaust duct that is bent horizontally on the ground side. A heating heater is wound around and fixed to at least the outer periphery of the upper portion of the exhaust duct.

Further, in the concrete cooling equipment of the present invention, it is preferable that a box with a cleaning door that can be opened and closed is provided at an end of the exhaust duct on the grounding side of the vertical pipe section.

[0012]

In the cooling equipment having the above-mentioned structure, at least the upper part of the exhaust duct is always heated by the heater wound around it, so that the mortar mixed in the white smoke is contained in the duct pipe. Passes through the duct without adhering to the surrounding surface due to icing.

Further, if a box is provided at a location where the vertical piping portion and the horizontal piping portion of the exhaust duct intersect on the ground side, the mortar accumulated there can be eliminated,
The mortar component that has flowed into the exhaust duct can be easily removed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. 1 and 2 show a drive-through type cooling station 10 to which the present invention is applied. In addition, in this embodiment, the concrete mixing truck C is provided by the cooling station 10 as an example of the cooling equipment.
I will describe the case of cooling the concrete inside,
The present invention is not limited to this embodiment, and can be easily applied to, for example, cooling concrete in an agitator of a fixed mixer or other kneading device.

The cooling station 10 shown in the figure has an assembled frame structure, and includes a pair of A-shaped side frames 12 in which the upper ends of pipe members are hingedly connected, and both side frames 1.
A pipe frame 14 that connects the top and middle of 2;
Reinforcement pipes 16 and 18 integrated into the middle and lower portions of each side frame 12 by bolt connection or the like, and an intermediate stage 2 disposed above the intermediate reinforcement pipes 16.
0 and an upper stage 22 integrally disposed on the pipe frame 14, and has a gate-shaped frame structure when viewed from the front for easy assembly and disassembly.
The concrete mixer truck C is sized so that it can pass through the space surrounded by the frame 12 on both sides.

A nozzle device 24 is arranged on the intermediate stage 20. The nozzle device 24 is a hydraulic cylinder 28 swingably supported on the intermediate stage 20 via a bracket 26, and one end is joined to the cylinder 28, and the other end is connected to the intermediate stage 20. An angle adjusting jack 30 is provided. A hollow plunger 32 that is inserted into the cylinder 28 so as to be able to move forward and backward, and is arranged on the inner circumference of the hollow plunger 32.
The nozzle 34 for supplying the liquefied gas is provided so as to protrude from the lower front portion of the intermediate stage 20.

The rear end of the nozzle 34 is a flexible hose.
It is connected to the LN2 gas supply device 38 via a gas 36 or the like.

As shown in FIG. 2, a white smoke removing hood 40 is arranged in the lower portion on the front side of the intermediate stage 20, and the upper ends of both sides of the hood 40 are connected to the upper stage 22. It is connected to a pair of hydraulic cylinders 42 for raising and lowering.

A tubular portion 40a is integrally provided on the upper portion of the hood 40, and the tubular portion 40a is provided in the exhaust duct 4.
It is slidably inserted in the lower part of 4.

The exhaust duct 44 is provided at the lower end with the cylindrical portion 40a.
And a vertical tube 44a fixed to the upper stage 22 and an upper horizontal tube 44c connected to the upper end of the vertical tube 44a via an elbow 44b.
a vertical pipe 44d which is connected to the other end of c through an elbow 44b and which is vertically piped to the surface along the side surface of one side frame 12 of the cooling station 10;
Box 44e connected to the surface side of the vertical pipe 44d
And the lower horizontal pipe 4 connected to the other end of the box 44e.
4f, and the other end of the lower horizontal pipe 44f is connected to a white smoke removing device 46 arranged on the ground surface.

The exhaust duct 4 having the above structure
A rubber heater 48 for heating is wound around and fixed to at least the upper part of 4, ie, the upper part consisting of the elbow 44b and the upper horizontal tube 44c, and the exhaust duct 44 is heated by energizing this. There is.

Further, as shown in FIG. 3, the box 44e connected to the intersection of the vertical pipe 44d and the horizontal pipe 44f is provided with a cleaning door 50 on its side so that the cleaning door 50 can be opened and closed. The accumulated mortar can be removed by opening the door 50.

Although not shown, the white smoke removing device 46 is provided with a filter for removing mortar, a suction fan, a heating means, a smoke exhaust chimney, etc. which are connected in series to the horizontal pipe 44f. .

Further, in the figure, reference numeral 52 is a trap for connecting the upper stage 22 and the intermediate stage 20, and the intermediate stage 20 and the ground surface, and 54 is a handrail provided on each of the stages 20 and 22.

Next, the concrete cooling work in the above configuration will be described. First, in FIG. 1, in a state where the nozzle 34 is in the retracted position and the hood 40 is in the raised position, the concrete mixer truck C may move forward from the rear side of the cooling station 10 and pass through the inside thereof. it can. When the concrete mixer truck C stops at the designated stop position, the hopper C2 of the agitator C1 is located diagonally forward of the nozzle 34 and directly below the hood 40.

Therefore, when the hydraulic cylinder 28 is driven after the vehicle is stopped to move the plunger 32 forward, the nozzle 34 is inserted into the agitator C1 through the hopper C2.
The intrusion angle is adjusted by the angle adjusting jack 30 as needed.

Next, by driving the hydraulic cylinder 42 to lower the hood 40, the opening of the hopper C2 is closed.

After the above preparatory operation is completed, with the agitator C1 of the mixer truck C rotated, the LN2 gas supply device 3
By driving 8, LN2 is discharged into the concrete and mixed with the concrete to cool it.

At the same time, the white smoke removing device 46 is operated, and the white smoke is removed from the hood 40 to the tubular portion 4 by the suction force of the white smoke removing device 46.
0a and the exhaust duct 44 through the white smoke removing device side 46
It is sucked to the side, subjected to, for example, a clarification treatment such as heating, and then discharged to the outside.

In the above white smoke distribution process, the elbow 4
The upper portion of the exhaust duct 44 including the 4b and the upper horizontal pipe 44c is heated by the rubber heater 48 and is not cooled by the passage of the white smoke. Therefore, the mortar component mixed in the white smoke is distributed to the inner peripheral surface of the exhaust duct 44. It does not adhere due to icing or the like, and is mixed with white smoke and flows through the upper portion of the exhaust duct 44.

The mortar contained in the white smoke that has passed through the upper portion of the exhaust duct 44 is liable to be attached to the vertical pipe 4 due to its own weight.
Vertical pipe 44d and lower horizontal pipe 4 at the surface through 4d
It falls at the intersection of 4f and is sequentially deposited inside the box 44e provided at the intersection. Therefore, the mortar that has flowed into the duct can be easily removed by periodically opening the cleaning door 50 of the box 44e and taking out the mortar.

When the cooling work is completed, each device 38,
Stop 46 and return the hood 40 to the raised position again,
If the nozzle 34 is located at the retracted position, the mixer truck C can be started in this state.

In the above embodiments, the present invention is applied to a drive-through type concrete cooling station for a concrete mixer truck, but the present invention is not limited to such embodiments.

[0034]

As described in detail above, in the concrete cooling equipment according to the present invention, since at least the upper part of the exhaust duct is heated by the heater for heating, the mortar component mixed in the white smoke is ducted. It passes without adhering to the inner peripheral surface of the pipe due to icing or the like, and therefore mortar accumulation in the exhaust duct can be easily prevented.

If a box with a cleaning door that can be opened and closed is provided at the end of the exhaust duct on the grounding side of the vertical piping,
The mortar that has flowed into the exhaust duct can be easily removed.

That is, the maintenance of the apparatus can be easily performed, and the operation rate of the cooling work can be improved.

[Brief description of drawings]

FIG. 1 is a side view of a cooling station according to an embodiment of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 4 is an explanatory view showing a conventional exhaust duct piping structure and its problems.

[Explanation of symbols]

 10 Cooling Station (Concrete Cooling Facility) 20 Intermediate Stage 22 Upper Stage 38 LN2 Gas Supply Device 40 White Smoke Removal Hood 44 Exhaust Duct 44e Box 46 White Smoke Removal Device 48 Rubber Heater 50 Cleaning Door

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Toshio Yasuda 2-3 Chome, Kandajimachi, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office

Claims (2)

[Claims] 1. A hood for removing white smoke, which is disposed so as to face an opening of an agitator into which liquefied gas is injected, and one end of the hood communicates with the upper part of the hood, and the agitator is provided with a bent upper part. In a concrete cooling facility having an exhaust duct vertically piped laterally and horizontally bent on the ground surface side, a heating heater is wound and fixed around at least the upper outer periphery of the exhaust duct. Concrete cooling equipment characterized by. 2. The concrete cooling equipment according to claim 1, wherein a box with a cleaning door that can be opened and closed is provided at an end of the exhaust duct on the grounding side of the vertical pipe section.