JPS647929B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for transferring cohesive soil, and more particularly to a method for transferring cohesive soil that can smoothly transfer excavated cohesive soil lumps to a predetermined location by air flow without clogging soil transport pipes. It is something.

Usually, belt conveyors are widely used as a method for transporting earth and sand excavated at civil engineering and construction sites, and belt conveyors are also used to transport highly cohesive clay.

However, such a transfer method using a belt conveyor not only requires a relatively large installation area, but also requires the installation of a combination of multiple short devices if it is to be used in a curved area. Moreover, it required a large installation area, making it extremely difficult to use it in narrow spaces or on-site with curved sections.

In order to solve this problem, it is possible to use air as a transport carrier, which is widely used as a transportation method for powdery materials such as grains and chips. If used as is when transporting, it would not only adhere to the input port or inside the transport pipe, obstructing the flow of transport, but would eventually block these and make transport impossible, posing a safety problem. As a countermeasure to this problem, it is possible to add water, bentonite, oil, etc. to fluidize the clay soil, but this method is treated as industrial waste and there are problems with its disposal after transportation.

This invention was made against this background, and its purpose is to enable installation in narrow or curved areas without requiring a relatively large installation area, and to transport cohesive soil safely and reliably. The goal is to provide a method for transporting clayey soil.

In order to achieve the above object, the present invention provides a method for discharging a viscous soil lump by pneumatic transport within a cylindrical earth and sand transport pipe, in which a liquid containing a foaming agent consisting of a protein or a surfactant is added to the viscous soil lump. By supplying foam made by foaming with compressed air to cause the soil to adhere, the foam is interposed between the viscous soil lumps to prevent them from binding to each other, and the foam is also placed between the viscous soil mass and the inner wall of the earth and sand transport pipe. This method is characterized by transporting the viscous soil toward the discharge side while preventing it from sticking to the inner wall.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the method for transferring clayey soil according to the present invention. First, we will explain the equipment used in the transfer method shown in the figure.
The cohesive soil transfer device includes a relatively short belt conveyor 12 for supplying cohesive soil blocks 10 with adhesive or cohesive properties excavated at civil engineering and construction sites to the device, and a substantially inverted conical feeder with open top and bottom ends. At the bottom of the input hopper 14, a liquid 16 containing a foaming agent (for example,
The foaming agent (obtained by dissolving in water a protein-based foaming agent such as animal hydrolyzed protein or a surfactant such as higher alkyl ether sulfate salt) is sent via a pump 20 from a storage tank 18 containing a A foaming and discharging device 26 includes a foaming device 24 that foams the liquid 16 and the compressed air sent from the compressor 22, and the blowing portion of the foaming device 24 is located on the side of the input hopper 14. Further, at the bottom of the input hopper 14, one end of a hollow, cylindrical earth and sand transport pipe 28 with open ends is connected to the input hopper 14.
It is installed in such a way that it communicates with the

The material of the earth and sand transport pipe 28 may be any material as long as the inside thereof is hollow and can accommodate the cohesive soil lump 10.
Preferably, it is a strong pipe or the like with a smooth inner surface.

The other end of the earth and sand transport pipe 28 has a substantially cylindrical shape, and stores the clay transferred through the earth and sand transport pipe 28, and discharges it from the discharge port 30 at the lower end, which can be opened and closed. A removable earth and sand separation tank 32 is disposed in communication with an end of the earth and sand transport pipe 28 projecting slightly inward from the side, and above the earth and sand separation tank 32 is provided a vacuum pump 34 for suction. A pipe 36 is provided in communication, and when the vacuum pump 34 is driven, an air flow from the input hopper 14 to the sand separation tank 32 is created in the earth and sand transport pipe 28.

When the cohesive soil lump 10 is supplied into the hopper 14 by the belt conveyor 12 to the cohesive soil transfer device configured in this way, the input hopper 1
The liquid 16 foamed by the foamer 24 is sprayed onto the cohesive soil mass 10 at the bottom of the clay mass 10, and the surface of the cohesive soil mass 10 is covered with bubbles, and in this state, the soil transport pipe 28 is reach one end.

A sediment separation tank 3 is installed inside the sediment transport pipe 28 by driving the vacuum pump 34.
2, the cohesive soil clod 10 whose surface is covered with bubbles is suction-transferred to the sediment separation tank 32 through the sediment transport pipe 28, and inside the sediment separation tank 32, It falls under its own weight and is gradually deposited from below, and the clay soil is transported from the site until it is ready for use.

As a result, the bubbles adhere to the entire surface of the inner wall of the earth and sand transfer pipe 28 due to the transfer of the cohesive soil lump 10.

When the cohesive soil mass 10 is transported with such a configuration, the soil transport pipe 28 not only does not require a large installation area unlike a conventional belt conveyor, but also can move along a curved line even in a curved area. Easy to place, 10 clay clods
The flow of air transporting the air is not obstructed.

Also, it should be noted that the method for transferring cohesive soil having the above-mentioned structure covers the surface of the cohesive soil lump 10 with strong cohesiveness or adhesiveness with bubbles, so that it can be transferred into the input hopper 14 and the soil is transported. Since adhesion within the pipe 28 is prevented and the cohesive soil clods 10 are prevented from binding to each other, there is no fear that the transfer flow will be obstructed or blocked due to adhesion or binding, and the cohesive soil clods 10 is that the transfer is smooth and reliable, and there are no safety problems.

Furthermore, after the foam used in carrying out the present invention is stored in the earth and sand separation tank 32, it is destroyed in a relatively short period of time, and the viscous soil lump 10 becomes almost the same as the excavated state, so that it can be handled and processed in the future. is not considered as industrial waste.

FIG. 2 shows another embodiment of the clayey soil transfer method according to the present invention, and only its characteristics will be explained.

The equipment used for the clayey soil transfer method shown in the figure is:
Storage tank 18 and pump 2 as in the above embodiment
0, a foaming discharge device 26 consisting of a foaming device 24, etc.;
The foamer 24 is provided at the upper end of the input hopper 14, and the foamer 24 is provided between the bottom of the input hopper 14 and the earth and sand transport pipe 28. is provided with a disk-shaped feeder 40 that rotates vertically in a vertical plane and has a plurality of spaces 38 partitioned by radial partition walls.

A blower 42 is disposed at the end of the earth and sand transport pipe 28 to urge the viscous soil 10 supplied into the earth and sand transport pipe 28 from behind and create an air flow toward the earth and sand separation tank 32. Further, above the earth and sand separation tank 32, an exhaust port 44 is provided for discharging the air sent out from the blower 42 to the outside.

In the clayey soil transfer device configured in this way, a belt conveyor 1 is inserted into the input hopper 14 from the excavation site.
2, when the viscous earth lump 10 is supplied, the foamer 24 foams the liquid 16 and then sprays the viscous earth 10.
falls into the space 38 of the feeder 40 in a state covered with bubbles, and the inside of the space 38 is covered with viscous soil 1.
When it rotates in the direction of the arrow and reaches the side opposite to the input hopper 14, it falls into the earth and sand transport pipe 28 due to its own weight.

Then, if the blower 42 is driven,
The viscous soil mass 10 within the earth and sand transport pipe 28 is energized by the airflow and is transferred to the earth and sand separation tank 32.

In this case, since the feeder 40 rotates in the direction of the arrow with the space 38 filled with the clay clod 10, the air sent out from the blower 42 is prevented from leaking to the outside from this part. It has a function of preventing this and always supplying a certain amount of the viscous soil mass 10 into the earth and sand transport pipe 28.

As is clear from the above configuration, even with this method, the effects shown in the first embodiment can be achieved.

In the above embodiment, one foamer 24 for supplying foam to the cohesive soil lump 10 is installed at one end of the earth and sand transport pipe 28, but the implementation of the present invention is not limited to this. If the earth and sand transport pipe 28 is relatively long, it is also possible to install a plurality of foamers 24 in the middle of the earth and sand transport pipe 28, and by doing so, the viscous soil lump 10 can be covered. Even if the bubbles disappear midway,
Since it can be covered with foam again, there is no problem in transporting it over long distances.

Furthermore, the foam covering the cohesive soil lump 10 can be supplied not only by foaming and then spraying as described above, but also by pouring the foam together with the cohesive soil lump 10, so that the foam particles can be It is preferable that the diameter be relatively small, and more preferably that the bubbles are in the form of mist.By doing so, the bubbles will not be destroyed when, for example, 10 viscous soil blocks covered with bubbles collide with each other. less likely to occur.

As explained in detail in the embodiments above, the method for transferring cohesive soil according to the present invention uses airflow from a vacuum pump, blower, etc. to transfer cohesive soil, so it can be used even in narrow places or curved places. Not only is it possible to transport cohesive soil with a relatively small installation area, but by covering the cohesive soil clods with foam, it is possible to prevent the cohesive soil clods from binding to each other and to soil transport pipes, etc. It can be transported reliably and safely in an extremely stable state.

In addition, the foam used in the practice of the present invention disappears in a relatively short time after being transferred to a designated location, does not cause any hindrance in subsequent handling, and does not cause pollution problems when disposing of clayey soil. It won't happen.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing one embodiment of the present invention, and FIG. 2 is a schematic diagram showing another embodiment. 10... Cohesive soil clod, 12... Belt conveyor,
14...Input hopper, 16...Liquid, 18...
Storage tank, 20... pump, 22... compressor, 24... foamer, 26... foaming discharge device, 28... earth and sand transport pipe, 30... discharge port, 32
... Sediment separation tank, 34 ... Vacuum pump, 36
...Suction piping, 38...Space section, 40...Feeder, 42...Blower, 44...Exhaust port.

Claims (1)

[Claims] 1. A method in which a viscous soil lump is put into a hollow cylindrical earth and sand transportation pipe, the viscous soil mass is transported along the interior of the transport pipe by pneumatic transport, and is discharged from the end of the transport pipe. A liquid containing a foaming agent made of protein or a surfactant is supplied with foam made by compressed air to adhere to the soil, and the foam is interposed between the viscous soil lumps to prevent them from binding to each other. At the same time, bubbles are also interposed between the viscous soil lump and the inner wall of the transport pipe to prevent the viscous soil lump from sticking to the inner wall of the transport pipe, while transporting the viscous soil mass toward the discharge side of the transport pipe. A method for transferring cohesive soil, which is characterized by: