JP6854211B2 - Transport method and transport device - Google Patents

Description

The present invention relates to a method for transporting earth and sand and a transport device.

Various techniques have been conventionally known as a transport method and a transport device for transporting earth and sand. After being excavated at a construction site, for example, earth and sand are passed through the inside of a transport pipe and transported. For example, Patent Document 1 describes a method for transporting earth and sand using pumping by a compressor and suction by a vacuum pump. In the transport method described in Patent Document 1, a transport pipe for transporting earth and sand inside, a compressor for supplying compressed air to the inside of the transport pipe, and a vacuum pump for sucking air and earth and sand inside the transport pipe are used. A provided transport device is used. In the transport method described in Patent Document 1, compressed air is supplied to the inside of the transport pipe by the operation of the compressor, and the earth and sand inside the transport pipe is pressure-fed by the compressed air. In addition to this, in the transport method described in Patent Document 1, the internal pressure on the downstream side in the transport direction in the transport pipe is lowered by the operation of the vacuum pump, and the earth and sand are sucked and transported to the downstream side in the transport direction in the transport pipe.

Japanese Unexamined Patent Publication No. 2-221596

The earth and sand transported as described above may contain a component having high adhesion to the inner surface of the transport pipe. Therefore, when the earth and sand are conveyed inside the transport pipe, the earth and sand may adhere to the inner surface of the transfer pipe due to the highly adhesive component contained in the earth and sand. When sediment adheres to the inner surface of the transport pipe, the sediment further adheres to the adhered sediment, and the sediment accumulates inside the transport pipe. The problem that the inside of the transport pipe is blocked by this accumulated sediment can occur. When the inside of the transport pipe is blocked, it becomes necessary to remove the blocked portion, so that the work of transporting earth and sand must be interrupted. Therefore, there may be a problem that the efficiency of the transport work for transporting the earth and sand is lowered.

An object of the present invention is to provide a transport method and a transport device capable of suppressing adhesion of earth and sand to the inner surface of a transport pipe.

The transport method according to the present invention is a transport method for transporting earth and sand inside the transport pipe, in which a step of transporting the earth and sand inside the transport pipe by a transport means and an inner surface of the transport pipe and earth and sand inside the transport pipe. In the process of arranging the low-friction material, which is provided with a step of arranging the low-friction material to reduce the friction with the compressor, the conveying means is a compressor that supplies compressed air and an ejector that sends compressed air from the compressor to the conveying pipe. A hose for connecting the compressor and the ejector is provided, and the low friction material is conveyed to the inside of the transport pipe by the operation of the compressor and the ejector .

In the transport method according to the present invention, a low-friction material that reduces friction between the inner surface of the transport pipe and the sediment is arranged inside the transport pipe before the earth and sand are transported to the inside of the transport pipe. This makes it possible to make the earth and sand slippery with respect to the inner surface of the transport pipe. Therefore, when the earth and sand are conveyed inside the transfer pipe, it is possible to prevent the earth and sand from staying on the inner surface of the transfer pipe, so that the adhesion of the earth and sand to the inner surface of the transfer pipe can be suppressed. By suppressing the adhesion of earth and sand to the inner surface of the transport pipe, it is possible to make it difficult for the earth and sand to accumulate on the inner surface of the transport pipe, so that the internal blockage of the transport pipe can be suppressed. As a result, it is possible to eliminate the need to remove the blocked portion, so that it is possible to prevent interruption of the soil transport work. Therefore, it is possible to improve the efficiency of the transport work for transporting earth and sand.

In the transport method according to the present invention, the low-friction material has water repellency and is granulated before being placed inside the transport pipe. In the step of arranging the low-friction material, the transport means is used. The inner surface may be coated with the low friction material by pouring a granular low friction material into the inside of the transport pipe and bringing the low friction material into contact with the inner surface. In this case, before transporting the earth and sand into the transport pipe, the granular low friction material is poured into the inside of the transport pipe by the transport means, and the low friction material is brought into contact with the inner surface of the transport pipe. When this low-friction material comes into contact with the inner surface of the transport pipe, at least a part of the low-friction material adheres to the inner surface of the transport pipe. Therefore, when the granular low-friction material is poured into the inside of the transport pipe, the low-friction material initially adheres to the inner surface of the transport pipe in a mottled manner, but by repeatedly pouring the low-friction material into the inside of the transport pipe. , The low-friction material comes into contact with various parts on the inner surface of the transport pipe, and the low-friction material gradually adheres so as to cover the entire inner surface of the transport pipe. In this way, the inner surface of the transport tube is coated with a low friction material. Since this low friction material has water repellency, the portion coated with the low friction material also has water repellency. Therefore, by coating the inner surface of the transport pipe with the low friction material, the water repellency of the portion of the inner surface of the transport pipe where the earth and sand come into contact can be enhanced. Therefore, by transporting the earth and sand while contacting the portion where the water repellency is enhanced, that is, the coated portion, the earth and sand can be made slippery with respect to the inner surface of the transport pipe. Therefore, since it is possible to prevent the sediment from staying on the inner surface of the transport pipe, it is possible to suppress the adhesion of the sediment to the inner surface of the transport pipe.

In the transfer method according to the present invention, in the step of arranging the low friction material, the low friction material may be arranged so that the low friction material extends in a strip shape inside the transfer pipe. In this case, when the earth and sand are transported to the inside of the transport pipe, the low friction material is arranged so as to extend in a strip shape inside the transport pipe. As a result, when the earth and sand are transported inside the transport pipe, the strip-shaped portion of the low-friction material is deformed in a wavy manner in the direction intersecting the longitudinal direction of the transport pipe. When the low-friction material comes into contact with the earth and sand due to this deformation, it is possible to suppress the adhesion of the earth and sand to the inner surface of the transport pipe.

In the transfer method according to the present invention, in the step of arranging the low friction material, the low friction material may be arranged so that the low friction material extends in a tubular shape along the inner surface of the transfer pipe. In this case, when the earth and sand are transported to the inside of the transport pipe, the low friction material is arranged so as to extend in a tubular shape along the inner surface of the transport pipe. As a result, when the earth and sand are transported inside the transport pipe, the tubular low-friction material extends along the inner surface of the transport pipe, so that the inner surface of the transport pipe is covered with the low-friction material. Since the low-friction material transports the earth and sand inside the transport pipe with the inner surface of the transport pipe covered, the earth and sand can be made slippery with respect to the inner surface of the transport pipe. Therefore, since it is possible to prevent the sediment from staying on the inner surface of the transport pipe, it is possible to suppress the adhesion of the sediment to the inner surface of the transport pipe.

In the transport method according to the present invention, the low friction material may be composed of a fluororesin. Fluororesin has the property that it is difficult for earth and sand to adhere to it. Since the low-friction material is made of fluororesin, which does not easily adhere to the earth and sand, it is possible to prevent the earth and sand from adhering to the low-friction material. Therefore, by arranging the low-friction material made of fluororesin inside the transport pipe, it is possible to suppress the adhesion of earth and sand to the low-friction material and also to suppress the adhesion of earth and sand to the inner surface of the transport pipe. Can be done.

In the transfer method according to the present invention, in the step of arranging the low friction material, fine irregularities may be formed on the inner surface as the low friction material. In this case, the water-repellent effect can be generated on the inner surface of the transport pipe by forming fine irregularities on the inner surface of the transport pipe. Since a water film can be formed on the uneven portion on the inner surface of the transport pipe, the water film can make the earth and sand slippery. Therefore, by forming fine irregularities that cause a water-repellent effect on the inner surface of the transport pipe, it is possible to make the sediment slippery with respect to the inner surface of the transport pipe when transporting the earth and sand inside the transport pipe. Therefore, since it is possible to prevent the sediment from staying on the inner surface of the transport pipe, it is possible to suppress the adhesion of the sediment to the inner surface of the transport pipe.

Further, the transport device according to the present invention includes a transport pipe for transporting earth and sand inside, a transport means for transporting earth and sand inside the transport pipe, and an inner surface of the transport pipe and earth and sand arranged inside the transport pipe. It is equipped with a low friction material that reduces friction, and the transport means includes a compressor that supplies compressed air, an ejector that sends compressed air from the compressor to the transport pipe, and a hose that connects the compressor and the ejector. And the low friction material is conveyed to the inside of the transfer pipe by the operation of the ejector .

In the transport device according to the present invention, a low friction material that reduces friction between the inner surface of the transport pipe and earth and sand is arranged inside the transport pipe. By arranging the low-friction material inside the transport pipe, the earth and sand are conveyed while being in contact with the low-friction material whose friction with the earth and sand is suppressed. Therefore, it is possible to make the earth and sand slippery with respect to the inner surface of the transport pipe. Therefore, since it is possible to prevent the sediment from staying on the inner surface of the transport pipe, it is possible to suppress the adhesion of the sediment to the inner surface of the transport pipe. As a result, as in the case of the above-mentioned transport method, it is possible to suppress the blockage inside the transport pipe, so that the efficiency of the soil transport work can be improved.

According to the present invention, it is possible to suppress the adhesion of earth and sand to the inner surface of the transport pipe.

It is a conceptual diagram for demonstrating the schematic structure of the earth and sand transport device which concerns on 1st Embodiment. It is a partial cross-sectional view which shows the part where the ejector of the transport device of FIG. 1 is arranged. It is a conceptual diagram for demonstrating the process of forming a water-repellent coat layer in the transport method which concerns on 1st Embodiment. It is a partial cross-sectional view which shows the part where the ejector of the transport device which concerns on 2nd Embodiment is arranged. It is a schematic perspective view which shows the low friction material provided in the transport device of FIG. It is a figure which shows typically the state which the low friction material of FIG. 5 is gathered together on the ejector side. It is a schematic perspective view which shows the low friction material which concerns on 3rd Embodiment. It is a partial cross-sectional view which shows the part where the ejector of the transport device which concerns on 4th Embodiment is arranged. It is a partial cross-sectional view which shows the part where the ejector of the transport device which concerns on 5th Embodiment is arranged. It is a partial cross-sectional view which shows the part where the ejector of the transport device which concerns on 6th Embodiment is arranged. It is a partial cross-sectional view which shows the part where the ejector of the transport device which concerns on 7th Embodiment is arranged. It is a partial cross-sectional view which shows the part where the ejector of the transport device which concerns on 8th Embodiment is arranged. It is a partial cross-sectional view which shows the part where the ejector of the transport device which concerns on 9th Embodiment is arranged. It is a partial cross-sectional view which shows the part where the ejector of the transport device which concerns on 11th Embodiment is arranged. (A), (b) and (c) are diagrams schematically showing the velocity distribution of air inside the transport pipe. It is a partial cross-sectional view which shows the part where the ejector of the transport device which concerns on 12th Embodiment is arranged. It is a partial cross-sectional view which shows the part where the ejector of the transport device which concerns on 13th Embodiment is arranged. (A) and (b) are schematic cross-sectional views showing the details of the spiral groove of the transport device of FIG. It is sectional drawing which shows the mixer which is a modification of the earth and sand transport means.

Hereinafter, embodiments of a transport method and a transport device according to the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same reference numerals are used for the same or corresponding elements, and duplicate description will be omitted as appropriate.

(First Embodiment)
First, the schematic configuration of the earth and sand transport device according to the first embodiment will be described with reference to FIG. FIG. 1 is a conceptual diagram for explaining a schematic configuration of a soil transport device according to a first embodiment. In FIG. 1, the earth and sand are painted in gray. As shown in FIG. 1, the transport device 1 according to the present embodiment is used for transporting earth and sand, for example, at a construction site.

Generally, at a construction site or the like, the ground may be excavated when constructing a building structure, and it may be necessary to transport the earth and sand generated by the excavation. In addition, after the building structure is constructed, the excavation site may be backfilled with earth and sand, and it may be necessary to transport the earth and sand required for backfilling. The transport device 1 is for transporting earth and sand generated by such excavation or earth and sand necessary for backfilling at a construction site.

The transport device 1 includes a transport pipe 10 for transporting earth and sand inside, and a transport means 20 for transporting earth and sand inside the transport pipe 10. The transport pipe 10 includes a suction pipe 11 for sucking earth and sand, a transport hose 12 connected to the suction pipe 11 and internally transporting the earth and sand sucked by the suction pipe 11, and a transport means provided on the transport hose 12. Includes 20 tubes 13. As an example, the length of the transport pipe 10 is about 40 m.

Sediment is sucked into the suction pipe 11 by the transport means 20. The transport means 20 is connected to an intermediate portion of the transport hose 12, and the transport hose 12 transports earth and sand from the suction pipe 11 by the transport means 20. The transport hose 12 is divided at the pipe 13 of the transport means 20 as a boundary. Specifically, the transport hose 12 includes a first hose 12c that connects the suction pipe 11 and the pipe 13, and a second hose 12d that extends from the pipe 13 to the downstream side in the soil transport direction. In the present embodiment, the pipe 13 is a confluence pipe 22c of the ejector 22 described later of the transport means 20.

The earth and sand flow from the tip 11a of the suction pipe 11 toward the end 12e of the transport hose 12 inside the transport pipe 10. The earth and sand that has flowed inside the transport pipe 10 is discharged from the end 12e, and then transported to, for example, a predetermined transport destination. In the following, the direction in which the earth and sand are transported from the tip 11a to the end 12e is referred to as the “transport direction”. The upstream side in the transport direction may be simply referred to as the "upstream side", and the downstream side in the transport direction may be simply referred to as the "downstream side".

The transport hose 12 is made of polyvinyl chloride, for example, and may be a flexible hose. As an example, the inner surface of the flexible hose is a smooth surface, and an uneven ridge is formed on the outer surface of the flexible hose for reinforcement. This raised portion has, for example, a spiral shape. When the transport hose 12 is a flexible hose, the transport hose 12 can be easily bent and can be a transport hose 12 having excellent pressure resistance. The transport hose 12 may be transparent, and when the transport hose 12 is transparent, the state of earth and sand inside the transport hose 12 can be visually recognized.

As the transport hose 12, it is possible to use a hose other than the flexible hose, and the transport hose 12 does not have to be transparent. The transport hose 12 may be, for example, a steel pipe. When the transport hose 12 is a steel pipe, the arithmetic mean roughness (Ra) of the inner surface of the steel pipe is, for example, 2.5 μm or more and 3.5 μm or less.

The transport means 20 includes a compressor 21 that supplies compressed air, an ejector 22 that sends compressed air from the compressor 21 into the transport hose 12, and a hose 23 that connects the compressor 21 and the ejector 22. The compressor 21 is loaded on a truck, for example. The compressor 21 sends compressed air into the ejector 22 via the hose 23. The ejector 22 accelerates the compressed air sent from the compressor 21 and creates an air flow in the direction of transporting the earth and sand.

As shown in FIG. 2, the ejector 22 includes an introduction pipe 22a into which compressed air from the compressor 21 is introduced, a branch pipe 22b branched into two from the introduction pipe 22a, and an introduction pipe 22a of the branch pipe 22b. It includes a merging pipe 22c that merging on the opposite side. Compressed air from the compressor 21 is sent into the introduction pipe 22a. The compressed air sent into the introduction pipe 22a flows toward the branch pipe 22b in the direction indicated by the arrow B. Compressed air branched from the introduction pipe 22a is sent into the branch pipe 22b. The compressed air sent into each branch pipe 22b flows toward the merging pipe 22c in the direction indicated by the arrow C. Compressed air from the branch pipe 22b is sent into the confluence pipe 22c. The compressed air sent into the merging pipe 22c merges and flows in the direction indicated by the arrow D, and is discharged from the merging pipe 22c to the second hose 12d.

As described above, the flow of compressed air inside the ejector 22 accelerates the flow of compressed air. As a result, a negative pressure is generated in the portion of the transport pipe 10 on the upstream side of the ejector 22. Due to this negative pressure, earth and sand are sucked into the suction pipe 11 and the transport hose 12 from the tip 11a of the suction pipe 11. Therefore, the earth and sand are transported in the transport direction indicated by the arrow A inside the suction pipe 11 and the transport hose 12.

The transport device 1 includes a water-repellent coat layer 30 (low friction material) arranged inside the transport pipe 10. The water-repellent coat layer 30 is provided, for example, over substantially the entire area in the transport direction inside the transport pipe 10. That is, the water-repellent coat layer 30 is provided inside the suction pipe 11 and inside the transport hose 12.

The water-repellent coat layer 30 covers the inner surface 10a of the transport pipe 10. The water repellent coat layer 30 is formed, for example, by a coating wax containing a lubricating material. The water-repellent coat layer 30 is, for example, a layer having higher water repellency than the inner surface 10a. Since the water-repellent coat layer 30 has high water repellency, it repels moisture on the surface 30a of the water-repellent coat layer 30 to make the earth and sand slippery, and has low friction that reduces the friction of the earth and sand with respect to the inner surface 10a. Functions as a material.

The water-repellent coat layer 30 is made granular before being arranged inside the transport pipe 10. The water-repellent coat layer 30 is formed of, for example, a brazing material 5 (see FIG. 3). The brazing material 5 is, for example, a pellet-like organic substance that is solid at room temperature (about 5 to 35 ° C.) and becomes liquid when heated. The wax material 5 contains oil and has water repellency. As the brazing material 5, for example, paraffin wax is used. Paraffin wax is a natural wax derived from petroleum.

When paraffin wax is used as the brazing material 5, the paraffin wax is widely used and has an advantage that it is easily available. Further, since the melting point of paraffin wax is about 50 to 70 ° C., it is easy to process and does not melt even when used in summer. Therefore, when the brazing material 5 is paraffin wax, it can be a brazing material 5 having high processability and handleability.

The water-repellent coat layer 30 may be made of a granular material having water repellency other than the brazing material 5. The brazing material 5 may be a natural wax other than paraffin wax, a synthetic wax, or a processed / modified wax. Natural waxes include animal-derived waxes, plant-derived waxes, petroleum-derived waxes, or mineral-derived waxes. Animal-derived waxes are, for example, beeswax, spermaceti, or shellac wax. The plant-derived wax is, for example, carnauba wax, Japan wax, rice bran wax, or candelilla wax.

The petroleum-derived wax is, for example, microcrystalline wax. Mineral-derived waxes are, for example, Montan wax or Ozokerite. The synthetic wax is, for example, Fischer-Tropsch wax, oil-based synthetic wax (ester, ketones, amides, etc.) or hydrogenated wax. The processed / modified wax is, for example, an oxidized wax, a compounded wax or a modified Montan wax.

The water-repellent coat layer 30 is formed so as to cover substantially the entire inner surface 10a of the transport pipe 10, for example. By covering substantially the entire inner surface 10a with the water-repellent coat layer 30, the water repellency of substantially the entire inner surface 10a is enhanced. Inside the transport pipe 10, the earth and sand are transported while being in contact with the portion of the inner surface 10a where the water repellency is enhanced, that is, the surface 30a of the water repellent coat layer 30. As a result, the earth and sand can be made slippery with respect to substantially the entire inner surface 10a. The water-repellent coat layer 30 may not cover substantially the entire inner surface 10a, or may cover a part of the inner surface 10a.

Next, the method of transporting the earth and sand according to the first embodiment will be described with reference to FIG. As shown in FIG. 3, in this transport method, a step of arranging the water-repellent coat layer 30 inside the transport pipe 10 is executed (a step of arranging the low friction material) before transporting the earth and sand. In the step of arranging the water-repellent coat layer 30, the brazing material 5 is poured into the inside of the transport pipe 10 to form the water-repellent coat layer 30 on the inner surface 10a of the transport pipe 10.

Specifically, by operating the compressor 21 and the ejector 22, the brazing material 5 is conveyed inside the transfer pipe 10 in the transfer direction. At this time, the brazing material 5 is sucked into the inside of the suction pipe 11 from the tip 11a of the suction pipe 11, so that the brazing material 5 is poured in the transport direction. By pouring the brazing material 5 in this way, the brazing material 5 comes into contact with the inner surface 10a. At least a part of the brazing material 5 in contact with the inner surface 10a adheres to the inner surface 10a, and for example, a part of the brazing material 5 is chipped. The brazing material 5 itself may adhere to the inner surface 10a.

The brazing material 5 can be conveyed while being in contact with some points on the inner surface 10a of the conveying pipe 10. Therefore, when the brazing material 5 is transported inside the transport pipe 10, the brazing material 5 first adheres to the inner surface 10a in a dot shape. Then, when the brazing material 5 is continuously flowed into the transport pipe 10, the brazing material 5 comes into contact with various parts of the inner surface 10a. As a result, the brazing material 5 adheres so as to cover substantially the entire inner surface 10a, and is coated with the brazing material 5 to which the inner surface 10a adheres.

The number of times that a certain amount of brazing material 5 is poured into the inside of the transport pipe 10 is not particularly limited, but is, for example, about 3 times. Further, the brazing material 5 may be warmed in advance before the brazing material 5 is poured into the inside of the transport pipe 10. For example, when the brazing material 5 having a melting point of about 65 ° C. is used, the brazing material 5 may be poured after warming the brazing material 5 to about 50 ° C. Since the brazing material 5 softens when it is warmed, when the brazing material 5 preheated is poured into the inside of the transport pipe 10, the brazing material 5 easily adheres to the inner surface 10a. Therefore, since the brazing material 5 is preheated, the brazing material 5 can be easily adhered, so that the inner surface 10a can be efficiently coated with the brazing material 5.

After coating with the brazing material 5 to form the water-repellent coat layer 30, the earth and sand are transported (conveying step). At this time, the compressor 21 and the ejector 22 generate the above-mentioned negative pressure to suck the earth and sand from the suction pipe 11 and convey the earth and sand in the conveying direction. Since the earth and sand are conveyed while being in contact with the surface 30a of the water-repellent coat layer 30, they are slippery with respect to the inner surface 10a. As described above, the earth and sand are transported to complete a series of steps.

As described above, according to the transport method and the transport device 1 according to the first embodiment, by coating the inner surface 10a of the transport pipe 10 with the brazing material 5, the portion of the inner surface 10a where the earth and sand come into contact is designated as the water repellent coat layer 30. It is possible to increase the water repellency of the portion. Therefore, by transporting the earth and sand while contacting the surface 30a of the water-repellent coat layer 30, the earth and sand can be made slippery with respect to the inner surface 10a. Therefore, since it is possible to prevent the sediment from staying on the inner surface 10a, it is possible to suppress the adhesion of the sediment to the inner surface 10a of the transport pipe 10. By suppressing the adhesion of earth and sand to the inner surface 10a, it is possible to prevent the earth and sand from accumulating on the inner surface 10a, so that the internal blockage of the transport pipe 10 can be suppressed. As a result, it is possible to eliminate the need to remove the blocked portion, so that it is possible to prevent interruption of the soil transport work. Therefore, it is possible to improve the efficiency of the transport work for transporting earth and sand.

(Second Embodiment)
Next, the earth and sand transporting device according to the second embodiment will be described with reference to FIGS. 4 to 6. In the following description, the description overlapping with the first embodiment will be omitted as appropriate. As shown in FIGS. 4 and 5, in the earth and sand transfer device according to the second embodiment, a strip-shaped low friction material 40 is arranged inside the transfer pipe 10. The low friction material 40 is arranged inside the second hose 12d of the transport hose 12, for example. The low friction material 40 has a plurality of flexible sheets 40s, and is arranged so as to extend in a strip shape in the longitudinal direction of the transport hose 12.

One end 40a of each sheet 40s is connected by a string or the like so as to form an annular shape when viewed from the longitudinal direction of the transport hose 12. The end portion 40a is fixed to the inside of the transport hose 12. The other end 40b of each sheet 40s is a free end that is not connected to each other and is not fixed to other members. Each sheet 40s is in a state of extending in a strip shape in the longitudinal direction of the transport hose 12 starting from the fixed end portion 40a.

The strip shape refers to a shape in which a sheet-shaped member is elongated and thinly extended, and may be a rectangular shape or a shape other than a rectangular shape such as an elliptical shape. The state in which the low-friction material 40 extends in a strip shape means that, for example, each sheet 40s of the low-friction material 40 extends long and thin in the longitudinal direction of the transport hose 12 and intersects the longitudinal direction of the transport hose 12. Including the state where it is possible to swing.

As shown in FIG. 6, the low-friction material 40 is in a state of being gathered on the upstream side in a state where the earth and sand are not conveyed. In this case, when the earth and sand are transported, the low friction material 40 is in a strip-shaped state. The low friction material 40 extends along the inner surface 12a of the transport hose 12 in a strip shape extending in the longitudinal direction of the transport hose 12. The low friction material 40 has a plurality of slits 40c extending in the longitudinal direction of the transport hose 12, and the slits 40c and the sheet 40s are alternately arranged along the circumferential direction of the transport hose 12. When the earth and sand are transported, the strip-shaped portion (each sheet 40s) of the low friction material 40 extends in the longitudinal direction of the transport hose 12 and is shaken and deformed by the internal flow of the transport hose 12.

The low friction material 40 is deformed in a direction intersecting the longitudinal direction of the transport hose 12, and collides with or undulates on the inner surface 12a of the transport hose 12. For example, the low friction material 40 sways so as to approach and separate from the inner surface 12a. Depending on how the low-friction material 40 is arranged or shaken, the low-friction material 40 may not collide with the inner surface 12a. The strip-shaped portion of the low-friction material 40 is deformed as described above, and the earth and sand come into contact with the low-friction material 40, so that the flow of earth and sand with respect to the inner surface 12a is promoted.

The low friction material 40 is made of, for example, a fluororesin. As the fluororesin, for example, polytetrafluoroethylene is used. Compared with, for example, hard polyethylene, polypropylene, or vinyl chloride, the fluororesin has a low coefficient of friction with respect to earth and sand, and has the property of being hard to adhere to earth and sand. The coefficient of friction of rigid polyethylene is 0.008 to 0.18, the coefficient of friction of polypropylene is 0.3, and the coefficient of friction of vinyl chloride is 0.45, while the coefficient of friction of polytetrafluoroethylene is 0.004 to 0.18. It is 0.1. Therefore, when the low-friction material 40 is composed of polytetrafluoroethylene, the low-friction material 40 itself can make it difficult for earth and sand to adhere.

Next, a method of transporting earth and sand according to the second embodiment will be described. In the method for transporting earth and sand according to the second embodiment, the low friction material 40 is arranged before the step of conveying the earth and sand (step of arranging the low friction material). For example, the end portion 40a of the low friction material 40 is fixed inside the transport hose 12, and the low friction material 40 is gathered and arranged on the upstream side. After arranging the low friction material 40, the earth and sand inside the transport pipe 10 is transported (conveyed) in the same manner as in the first embodiment, and a series of steps is completed.

As described above, according to the second embodiment, when the earth and sand are transported inside the transport pipe 10, the strip-shaped portion of the low friction material 40 is deformed in a wavy direction in the direction intersecting the longitudinal direction of the transport pipe 10. do. When the low friction material 40 comes into contact with the earth and sand due to this deformation, it is possible to suppress the adhesion of the earth and sand to the inner surface of the transport pipe 10.

According to the second embodiment, since the low-friction material 40 is made of a fluororesin that does not easily adhere to the earth and sand, it is possible to prevent the earth and sand from adhering to the low-friction material 40. Therefore, by arranging the low-friction material 40 made of fluororesin inside the transport hose 12, it is possible to suppress the adhesion of earth and sand to the low-friction material 40.

(Third Embodiment)
Next, the earth and sand transporting device according to the third embodiment will be described with reference to FIG. 7. As shown in FIG. 7, in the earth and sand transfer device according to the third embodiment, the tubular low friction material 41 is arranged inside the transfer pipe 10. The low friction material 41 is a flexible tube, and is arranged so as to extend in a tubular shape along the inner surface 12a of the transport hose 12.

One end 41a of the low friction material 41 is fixed inside the transport hose 12. The other end 41b of the low friction material 41 is a free end that is not fixed to other members. The low friction material 41 is in a state of extending in a tubular shape along the inner surface 12a of the transport hose 12 starting from the fixed end portion 41a. Like the low-friction material 40 described above, the low-friction material 41 may be in a state of being gathered on the upstream side when the earth and sand are not transported. Then, when the earth and sand are conveyed, the low friction material 41 may be in a state of being extended in a tubular shape.

The low friction material 41 covers at least a part of the inner surface 12a in a state of being extended in a tubular shape. The portion of the inner surface 12a covered with the low friction material 41 is a portion where friction with the earth and sand is reduced, and the earth and sand become slippery in the portion. The material of the low friction material 41 may be the same as that of the low friction material 40, for example. As an example, when the low friction material 41 is made of a fluororesin, it is possible to make it difficult for earth and sand to adhere to the low friction material 41 itself.

In the earth and sand transporting method according to the third embodiment, the low friction material 41 is arranged inside the transport pipe 10 (step of arranging the low friction material) before the step of transporting the earth and sand. Specifically, the end portion 41a of the low friction material 41 may be fixed inside the transport hose 12, and the low friction material 41 may be gathered on the upstream side. After arranging the low friction material 41 inside the transport hose 12, the earth and sand are transported (conveying step). At this time, the low-friction material 41 conveys the earth and sand in a state of extending in a tubular shape along the inner surface 12a of the conveying hose 12, and then completes a series of steps.

As described above, according to the third embodiment, since the tubular low friction material 41 extends along the inner surface 10a of the transfer pipe 10, the inner surface 10a of the transfer pipe 10 is covered with the low friction material 41. Since the low-friction material 41 conveys the earth and sand to the inside of the transfer pipe 10 in a state of covering the inner surface 10a of the transfer pipe 10, the earth and sand can be made slippery with respect to the inner surface 10a of the transfer pipe 10. Therefore, since it is possible to prevent the sediment from staying on the inner surface 10a of the transport pipe 10, it is possible to suppress the adhesion of the sediment to the inner surface 10a of the transport pipe 10.

(Fourth Embodiment)
The earth and sand transporting device according to the fourth embodiment will be described with reference to FIG. As shown in FIG. 8, in the earth and sand transfer device according to the fourth embodiment, the uneven coat layer 43 is arranged inside the transfer pipe 10 as a low friction material. The uneven coating layer 43 may be provided over substantially the entire inside of the transport pipe 10, or may be provided in a part thereof.

On the surface 43a of the uneven coating layer 43, for example, concave portions 6 and convex portions 7 that are periodically and continuously arranged are formed. The height H of the convex portion 7 with respect to the concave portion 6 is, for example, 10 nm or more and 10000 nm (10 μm) or less. By forming the concave portion 6 and the convex portion 7, the water repellency of the uneven coating layer 43 is enhanced. For example, when a liquid is dropped on the surface 43a on which the concave portion 6 and the convex portion 7 are formed, a droplet is formed so as to make pinpoint contact with the convex portion 7 of the surface 43a, and the droplet is formed between the surface 43a and the droplet. A void layer is formed. Since a void layer is formed between the surface 43a and the droplet, and the contact area of the droplet with respect to the surface 43a can be reduced by the concave portion 6 and the convex portion 7, the contact area of the droplet with respect to the surface 43a can be reduced, so that it is at least higher than the inner surface 10a of the transport tube 10. Demonstrates water repellency.

A water film can be formed on the surface 43a of the uneven coating layer 43 by adsorption of water. For example, when the earth and sand come into contact with the surface 43a, the water contained in the earth and sand enters the concave portion 6 of the uneven coating layer 43, so that a water film is formed between the plurality of convex portions 7. Since the water film causes the earth and sand to emerge from the surface 43a, it becomes difficult for the earth and sand to adhere to the surface 43a.

The uneven coating layer 43 is made of, for example, a polyurea resin, and may be formed of LINE-X (registered trademark). As an example, a paint containing a polyurea resin is sprayed onto the inner surface 10a of the transport pipe 10, and the sprayed paint is cured to form a concave-convex coat layer 43. The uneven coating layer 43 is easily formed by spray-coating the inner surface 10a with a paint containing a polyurea resin.

In the method for transporting earth and sand according to the fourth embodiment, the uneven coat layer 43 is arranged inside the transport pipe 10 (step of arranging the low friction material) before the step of transporting the earth and sand. For example, a coating material containing a polyurea resin is sprayed onto the inner surface 10a of the transport pipe 10 to cure the coating material, thereby forming the uneven coating layer 43. After the uneven coating layer 43 is formed on the inner surface 10a, the earth and sand are conveyed (conveyed step) in the same manner as in each of the above-described embodiments. The earth and sand are conveyed while being in contact with the surface 43a of the uneven coat layer 43. A series of steps is completed through the above steps.

As described above, according to the fourth embodiment, by forming the concavo-convex coat layer 43 that causes the water-repellent effect on the inner surface 10a of the transport pipe 10, when the earth and sand are transported inside the transport pipe 10, the inner surface 10a is subjected to. The earth and sand can be made slippery. Therefore, since it is possible to prevent the sediment from staying on the inner surface 10a, it is possible to suppress the adhesion of the sediment to the inner surface 10a.

(Fifth Embodiment)
Next, the earth and sand transporting device according to the fifth embodiment will be described with reference to FIG. In FIG. 9, the earth and sand are painted in gray. The earth and sand transporting device according to the fifth embodiment includes a contact reducing material for reducing the contact of the earth and sand with the inner surface 10a of the transport pipe 10, and the contact reducing material is a sandy material 50. The transport device according to the fifth embodiment includes a sandy material 50, a supply pipe 51 for supplying the sandy material 50 to the transport pipe 10, and an ejector 52 arranged in the supply pipe 51.

The sandy material 50 does not contain a component having high adhesiveness. For example, the fine particle content (Fc) of the sandy material 50 is about 0%. The fine particle content (Fc) is a value indicating the ratio of fine particles (particles having a particle size of less than 75 μm) contained in the sandy material as a mass percentage. The average particle size of the sandy material 50 is, for example, 75 μm or more and 2 mm or less. The sandy material 50 is supplied from the ejector 52 to the inside of the transport hose 12 via the supply pipe 51 and the ejector 22. The sandy material 50 is transported together with the earth and sand inside the ejector 22 and the second hose 12d, for example. When the sandy material 50 is transported together with the earth and sand, the sandy material 50 is scattered around the earth and sand. The sandy material 50 exhibits a function of suppressing the earth and sand from coming into contact with the inner surface 12a of the transport hose 12 by being scattered around the earth and sand.

The sandy material 50 is discharged together with the earth and sand at the end 12e of the transport hose 12. The sandy material 50 and the earth and sand are discharged from the terminal 12e and then put into, for example, a vibrating sieving machine 54. The vibrating sieving machine 54 is a device that has a sieving surface such as a net and sifts raw materials and the like on the sieving surface. The vibrating sieving machine 54 sifts the charged sandy material 50 and the earth and sand, and separates the sandy material 50 from the earth and sand. The sandy material 50 separated by the vibrating sieving machine 54 can be reused as the sandy material 50 to be transported together with the earth and sand again. The vibrating sieving machine 54 may be a device separate from the transfer device, or may be integrated with the transfer device.

The supply pipe 51 is connected to the upstream side of the ejector 22. The supply pipe 51 is made of, for example, a steel pipe and is communicated with the ejector 22. A negative pressure is generated inside the supply pipe 51 by the operation of a compressor and an ejector 52 (not shown), and the sandy material 50 is pumped in the direction indicated by the arrow E by this negative pressure. The pumped sandy material 50 is sent into the ejector 22, and the sandy material 50 sent into the ejector 22 is conveyed together with the earth and sand by the above-mentioned conveying means 20. The ejector 52 may have the same configuration and function as the ejector 22 described above.

In the method for transporting earth and sand according to the fifth embodiment, the sandy material 50 is transported together with the earth and sand (transportation step). Specifically, by generating a negative pressure inside the supply pipe 51, the sandy material 50 is sucked from the ejector 52 into the inside of the supply pipe 51, and the sandy material 50 is supplied to the inside of the ejector 22. Then, the negative pressure generated by the operation of the compressor 21 and the ejector 22 sucks the earth and sand from the tip 11a of the suction pipe 11 and conveys the earth and sand inside the transport pipe 10. The sandy material 50 sent into the ejector 22 is conveyed together with the earth and sand inside the second hose 12d, for example. Therefore, in the second hose 12d, the sandy material 50 is conveyed together with the earth and sand in a state of being scattered around the earth and sand. Through the above steps, the transportation of earth and sand is completed.

The timing of starting the supply of the sandy material 50 to the ejector 22 may be before the transportation of the earth and sand, or at the same timing as the start of the transportation of the earth and sand, and when the earth and sand are being conveyed. There may be. The sandy material 50 and the earth and sand discharged from the end 12e of the transport hose 12 may be put into the vibrating sieve 54 to separate the sandy material 50 from the earth and sand. By separating the sandy material 50 from the earth and sand in this way, the separated sandy material 50 may be reused.

As described above, according to the fifth embodiment, the earth and sand are conveyed in a state where the sandy material 50 is scattered around the earth and sand inside the transport pipe 10. By transporting the earth and sand in a state where the sandy material 50 is scattered in this way, it is possible to make it difficult for the earth and sand to come into contact with the inner surface 10a of the transport pipe 10. Therefore, it is possible to suppress the adhesion of earth and sand to the inner surface 10a of the transport pipe 10.

(Sixth Embodiment)
Next, the earth and sand transporting device according to the sixth embodiment will be described with reference to FIG. As shown in FIG. 10, in the earth and sand transporting device according to the sixth embodiment, the agglomerating material 56 is used as a contact reducing material for reducing the contact of earth and sand. In the sixth embodiment, the earth and sand mixed with the agglomerate material 56 is transported.

The agglomerating material 56 is a material that agglomerates the earth and sand by being mixed with the earth and sand. Aggregation is the bonding of fine particles of earth and sand to form a lump. The agglomerating material 56 is composed of, for example, a soil modifier containing zeolite or magnesium oxide. The agglomerating material 56 agglomerates the earth and sand by being mixed with the earth and sand by, for example, a granulator 57.

The granulator 57 is a granulator that forms granulated products from raw materials by mixing raw materials. The granulator 57 mixes the charged agglomerate material 56 and the earth and sand to form an object 58 to be transported, which is larger than the earth and sand before the addition. The granulator 57 may be a device separate from the transport device, or may be integrated with the transport device. The object to be conveyed 58 is conveyed inside the transfer pipe 10. In the object to be transported 58, the highly adherent component of the soil is trapped inside due to the agglomeration, and the highly adherent component is difficult to be exposed to the outside.

In the method for transporting earth and sand according to the sixth embodiment, the agglomerating material 56 is mixed with the earth and sand before the transfer step. Specifically, the agglomerating material 56 and the earth and sand are put into the granulator 57, and the agglomerating material 56 and the earth and sand are mixed. As a result, the earth and sand are aggregated to form the object to be transported 58. The composition of the earth and sand to be charged into the granulator 57 and the agglomerating material 56 and the components constituting the agglomerating material 56 can be appropriately adjusted depending on the type or component of the earth and sand. Then, the object to be transported 58 is transported inside the transport pipe 10 (a step of transporting) in the same manner as in each of the above-described embodiments.

As described above, according to the sixth embodiment, by transporting the object to be transported 58 containing the earth and sand in a state where the highly adhesive component is confined inside, the adhesiveness of the earth and sand is high on the inner surface 10a of the transport pipe 10. The components can be made difficult to contact. Therefore, it is possible to suppress the adhesion of earth and sand to the inner surface 10a. Further, since the volume of the object to be transported 58 containing the earth and sand is increased by the agglomeration, it is possible to make it difficult for the earth and sand to adhere to the inner surface 10a as compared with the case where the volume before the agglomeration is small.

Further, since the volume of the object to be transported 58 is increased due to the agglomeration, the force received by the object to be transported 58 during transportation can be increased as compared with the case where the volume before the agglomeration is small. .. As a result, even if the object to be transported 58 comes into contact with the inner surface 10a, the contacted object 58 can be easily peeled off from the inner surface 10a.

(7th Embodiment)
Next, the earth and sand transporting device according to the seventh embodiment will be described with reference to FIG. In FIG. 11, the earth and sand are painted in gray, and the frozen and solidified surface of the earth and sand is shown by a thick solid line. The earth and sand transport device according to the seventh embodiment includes a freeze-solidification means 59 for freezing and solidifying the earth and sand, and transports the earth and sand frozen and solidified by the freeze-solidification means 59.

The freeze-solidification means 59 includes an injection nozzle 60 that injects liquid nitrogen, and a rotary drum 61 that internally agitates the liquid nitrogen and earth and sand injected from the injection nozzle 60. The injection nozzle 60, for example, injects atomized liquid nitrogen into the inside of the rotary drum 61. Sediment is previously put into the inside of the rotating drum 61. The rotating drum 61 has, for example, a cylindrical shape, and agitates the liquid nitrogen injected from the injection nozzle 60 and the earth and sand by rotating around the axis. The freeze-solidification means 59 may be a device separate from the transport device, or may be integrated with the transport device.

The liquid nitrogen and the earth and sand are agitated, and the liquid nitrogen is supplied to the earth and sand, so that at least the surface of the earth and sand is instantly frozen and solidified. Hereinafter, the earth and sand frozen and solidified by the freeze-solidification means 59 will be referred to as "frozen earth and sand". Since the surface of frozen earth and sand is frozen and solidified, the adhesiveness of the surface is low. In this way, the earth and sand are conveyed to the inside of the transfer pipe 10 in a state of being frozen earth and sand. The frozen earth and sand is discharged from the end 12e of the transport hose 12, and then the frozen and solidified portion is thawed to return to the same state as before the frozen and solidified portion.

In the method for transporting earth and sand according to the seventh embodiment, at least the surface of the earth and sand is frozen and solidified to form frozen earth and sand (step of freezing and solidifying) before the earth and sand are transported. Specifically, first, earth and sand are put inside the rotary drum 61, liquid nitrogen is injected into the earth and sand from the injection nozzle 60, and liquid nitrogen is supplied to the earth and sand by rotating the rotary drum 61. The amount of liquid nitrogen injected into the rotating drum 61 is appropriately adjusted depending on the type or component of earth and sand. Then, the frozen earth and sand are transported (conveyed) inside the transport pipe 10 in the same manner as in each of the above-described embodiments.

The frozen earth and sand are transported inside the transport pipe 10 and then discharged from the end 12e of the transport hose 12. Then, as described above, the frozen and solidified portion of the frozen soil is thawed to obtain the soil in the same state as before the frozen and solidified. Therefore, the water content ratio of the earth and sand does not change significantly before and after the transportation, and the mud formation of the earth and sand due to the larger water content ratio of the earth and sand after the transportation is suppressed than before the transportation.

As described above, according to the seventh embodiment, at least the earth and sand whose surface adhesion is reduced due to freezing and solidification is conveyed inside the transfer pipe 10, so that the earth and sand adhere to the inner surface 10a of the transfer pipe 10. It can be difficult. Further, according to the seventh embodiment, by supplying liquid nitrogen to the earth and sand, the earth and sand can be instantly frozen and solidified, so that the efficiency of the earth and sand transport work can be improved. Further, after the transportation of the earth and sand, the frozen and solidified portion of the earth and sand is thawed, so that the mud formation of the earth and sand can be suppressed. Therefore, it is possible to easily process the earth and sand after coming out of the transport pipe 10.

(8th Embodiment)
Next, the earth and sand transporting device according to the eighth embodiment will be described with reference to FIG. In FIG. 12, the earth and sand are painted in gray, and the water imparted to the surface of the earth and sand is shown by black dots. The earth and sand transport device according to the eighth embodiment includes a water supply unit 63 (supply means) for supplying water. The water supply unit 63 supplies water to the inside of the transport pipe 10 as a fluid that suppresses the retention of earth and sand on the inner surface 10a of the transport pipe 10.

A plurality of water supply units 63 are arranged, for example, in the second hose 12d of the transport hose 12. The water supply unit 63 includes a tank 64 for storing water, a pump 65 for pumping water from the tank 64, an injection nozzle 66 for injecting the water pumped by the pump 65 into the inside of the second hose 12d, a pump 65, and the pump 65. A pipe 67 for connecting the injection nozzle 66 is provided. The water pumped from the tank 64 by the pump 65 is sent to the injection nozzle 66 through the pipe 67.

The injection nozzle 66 is located, for example, on the downstream side of the ejector 22. The injection nozzle 66 is provided so as to penetrate the inner surface 12a and the outer surface 12b of the transport hose 12. The injection nozzle 66 sprays water in the form of a mist to the extent that the inside of the transport hose 12 is moistened. As a result, the injection nozzle 66 imparts an appropriate amount of water to the surface of the earth and sand to the extent that the earth and sand do not become muddy, for example. The amount of water sprayed by the injection nozzle 66 is, for example, 100 mL / min or more and 6000 mL / min or less, but can be appropriately changed.

Since the injection nozzle 66 imparts an appropriate amount of water to the surface of the earth and sand, even if the earth and sand come into contact with the inner surface 12a of the transport hose 12, a water layer is interposed between the earth and sand and the inner surface 12a. The layer makes the earth and sand slippery with respect to the inner surface 12a. Therefore, the retention of earth and sand on the inner surface 12a of the transport hose 12 is suppressed.

The method for transporting earth and sand according to the eighth embodiment includes a step of injecting water, and conveys the water injected in the step of injecting water together with the earth and sand. Specifically, the water pumped from the tank 64 by the pump 65 is sent to the injection nozzle 66 via the pipe 67, and water is sprayed from the injection nozzle 66 into the transport hose 12 (a step of injecting water). Then, as in each of the above-described embodiments, the earth and sand are transported (conveyed) inside the transport pipe 10, and a series of steps is completed. The timing at which the water supply unit 63 starts injecting water may be before the earth and sand are conveyed, at the same time as the start of the earth and sand transportation, or when the earth and sand are being conveyed. ..

As described above, according to the eighth embodiment, the water that suppresses the retention of earth and sand on the inner surface 12a of the conveying hose 12 is conveyed together with the earth and sand. As a result, when the earth and sand are conveyed inside the conveying hose 12, the water makes it difficult for the earth and sand to stay on the inner surface 12a. Therefore, since the fluidity of the earth and sand with respect to the inner surface 12a can be increased, the adhesion of the earth and sand to the inner surface 12a of the transport hose 12 can be suppressed.

According to the eighth embodiment, the water jetted from the outside of the transport hose 12 into the inside of the transport hose 12 is used as the water to be transported together with the earth and sand. Since an appropriate amount of water can be applied to the surface of the earth and sand by the water supply unit 63, the surface of the earth and sand can be made slippery with respect to the inner surface 12a of the transport hose 12. Therefore, since the fluidity of the earth and sand with respect to the inner surface 12a can be increased, the adhesion of the earth and sand to the inner surface 12a can be suppressed. Further, by imparting an appropriate amount of water to the surface of the earth and sand to the extent that it does not become muddy, it is possible to easily treat the earth and sand after it comes out of the transport pipe 10.

(9th Embodiment)
Next, the earth and sand transporting device according to the ninth embodiment will be described with reference to FIG. As shown in FIG. 13, the earth and sand transport device according to the ninth embodiment includes vibrators 68 and 69 as supply means for supplying water. When the earth and sand are vibrated by the vibrators 68 and 69, the retained water is exuded to the outside as water. The vibration frequencies of the vibrators 68 and 69 are appropriately set based on the components of the earth and sand.

The vibrator 68 is provided inside the transport pipe 10 on the outside of the container 70 for accommodating the earth and sand before being sucked. The vibrator 68 is arranged on the outer bottom surface 70a of the container 70, and vibrates from the outer bottom surface 70a to the earth and sand inside the container 70. The vibrator 68 exudes water from the earth and sand before being sucked into the transport pipe 10.

The vibrator 69 is provided, for example, on the outside of the second hose 12d. As an example, the vibrator 69 is arranged on the downstream side of the ejector 22 in the transport hose 12. The vibrator 69 vibrates from the outer surface 12b of the transport hose 12 to the earth and sand inside the transport hose 12.

By exuding water from the earth and sand, an appropriate amount of water is imparted to the surface of the earth and sand. By transporting the earth and sand with an appropriate amount of water applied to the surface, even if the earth and sand come into contact with the inner surface 10a of the transport pipe 10, a water layer is interposed between the earth and sand and the inner surface 10a. The water exuded from the earth and sand under the vibration in this way suppresses the retention of the earth and sand on the inner surface 10a.

The method for transporting earth and sand according to the ninth embodiment includes a step of exuding water, and transports the water exuded in the step of exuding water together with the earth and sand. Specifically, the vibrator 68 applies vibration to the earth and sand before being sucked into the transfer pipe 10, and the vibrator 69 applies vibration to the earth and sand inside the transfer hose 12. As a result, water is exuded from the earth and sand before being sucked into the inside of the transport pipe 10, and water is exuded from the earth and sand inside the transport pipe 10. Then, as in each of the above-described embodiments, the earth and sand are transported (conveyed) inside the transport pipe 10, and a series of steps is completed. The vibrators 68 and 69 may continuously vibrate the earth and sand, or may intermittently vibrate the earth and sand. In this way, the timing at which the vibrators 68 and 69 operate can be changed as appropriate.

As described above, according to the ninth embodiment, since an appropriate amount of water can be applied to the surface of the earth and sand by vibration, the earth and sand can be made slippery with respect to the inner surface 10a of the transport pipe 10. Therefore, since the fluidity of the earth and sand with respect to the inner surface 10a can be increased, the adhesion of the earth and sand to the inner surface 10a can be suppressed.

According to the ninth embodiment, by causing the earth and sand to vibrate, the water exuded from the earth and sand can be used as a fluid for suppressing retention on the inner surface 10a. By causing the earth and sand to vibrate, it is possible to impart an appropriate amount of water to the surface of the earth and sand to the extent that it does not become muddy, so that the earth and sand can be easily treated after coming out of the transport pipe 10. Further, in the ninth embodiment, since water is exuded from the earth and sand, it is not necessary to supply water from the outside of the transport pipe 10 to the inside of the transport pipe 10.

(10th Embodiment)
Next, the earth and sand transport device according to the tenth embodiment will be described. The earth and sand transport device according to the tenth embodiment includes, for example, a coil as a water supply means at a position where the vibrator 69 of FIG. 13 is provided. This transport device is used, for example, when the soil is a slurry-like dredged soil having a water content ratio higher than a predetermined value. The water content ratio of the earth and sand to which this transport device is applied is, for example, a value equal to or higher than the plastic limit, and preferably a value equal to or higher than the natural water content ratio + 2% and not more than twice the liquid limit. The coil is formed of, for example, a conducting wire wound around a second hose 12d, and an electromagnetic wave (electromagnetic energy) is generated when an electric current flows through the conducting wire. As in the case of receiving the vibration described above, the earth and sand receive the electromagnetic waves and exude the retained water as water to the outside.

The coil may be formed by winding a lead wire around the container 70. When an electric current flows through the coil, an electromagnetic wave acts on the earth and sand contained inside the container 70. Acting an electromagnetic wave means having an electric and magnetic influence by the electromagnetic wave, and includes acting an electromagnetic energy emitted by the generation of the electromagnetic wave. The coil causes water to be exuded from the earth and sand contained in the container 70 by causing an electromagnetic wave to act on the earth and sand contained in the container 70. As described above, the arrangement position of the coil can be changed as appropriate. The water exuded from the earth and sand by receiving the electromagnetic wave suppresses the retention of the earth and sand on the inner surface 10a of the transport pipe 10 as in the ninth embodiment described above.

In the method for transporting earth and sand according to the tenth embodiment, water is exuded from the earth and sand by a coil. As a specific example, an electromagnetic wave is caused to act on the earth and sand before being sucked into the inside of the transport pipe 10 and the earth and sand inside the transport hose 12 by a coil (step of exuding water). Then, as in each of the above-described embodiments, the earth and sand are transported (conveyed) inside the transport pipe 10, and a series of steps is completed.

As described above, also in the tenth embodiment, as in the ninth embodiment, the fluidity of the earth and sand with respect to the inner surface 10a of the transport pipe 10 can be increased, so that the adhesion of the earth and sand to the inner surface 10a can be suppressed. Further, according to the tenth embodiment, water can be exuded from the earth and sand by causing an electromagnetic wave to act on the earth and sand. Therefore, the same effect as that of the ninth embodiment can be obtained.

(11th Embodiment)
Next, the earth and sand transporting device according to the eleventh embodiment will be described with reference to FIG. In FIG. 14, the earth and sand are painted in gray. The earth and sand transport device according to the eleventh embodiment includes an air supply unit 72 (supply means) for supplying air. The air supply unit 72 supplies, for example, compressed air as a fluid that is conveyed together with the earth and sand and suppresses the retention of the earth and sand on the inner surface 10a of the transport pipe 10.

The air supply unit 72 is arranged at a plurality of locations of the second hose 12d of the transport hose 12, for example. The air supply unit 72 includes a compressor 73 that supplies air, an inflow nozzle 74 that allows air from the compressor 73 to flow into the inside of the second hose 12d, and a pipe 75 that connects the compressor 73 and the inflow nozzle 74. The air from the compressor 73 is sent to the inflow nozzle 74 through the inside of the pipe 75.

The inflow nozzle 74 is provided in the transport hose 12 so as to penetrate the inner surface 12a and the outer surface 12b of the transport hose 12, for example. The inflow nozzle 74 flows the air sent from the compressor 73 through the pipe 75 in the direction indicated by the arrow E along the inner surface 12a. The inflow amount of air from the inflow nozzle 74 is, for example, 200 NL / min or more and 1200 NL / min or less, but can be appropriately adjusted. In addition, NL / min indicates the unit of the inflow amount per minute measured in the reference state of a temperature of 0 ° C., an atmospheric pressure of 1013 hPa, and a relative humidity of 0%.

When air is supplied from the inflow nozzle 74 along the inner surface 12a of the transport hose 12, this air increases the flow velocity of the fluid flowing along the inner surface 12a. By the way, as shown in FIG. 15A, when the compressed air is not supplied to the inside of the transport hose 12, the transport hose 12 is compared with the center in the radial direction of the transport hose 12. The flow velocity of the fluid flowing on the inner surface 12a side becomes slow. Therefore, since it is difficult for earth and sand to flow on the inner surface 12a side as compared with the center in the radial direction of the transport hose 12, the earth and sand tend to adhere to the inner surface 12a.

On the other hand, when air is supplied along the inner surface 12a of the transport hose 12, the flow velocity of the fluid flowing on the inner surface 12a side can be increased by this air. Therefore, as shown in FIG. 15B, the flow velocity of the fluid inside the transport hose 12 can be made constant regardless of the position inside the transport hose 12. Further, by adjusting the inflow amount of air, as shown in FIG. 15C, the flow velocity of the air flowing on the inner surface 12a side can be made faster than the flow velocity at the center in the radial direction of the transport hose 12. .. Since the flow velocity of the fluid flowing on the inner surface 12a side of the transport hose 12 can be increased in this way, the fluidity of the earth and sand with respect to the inner surface 12a is enhanced. Therefore, the air supplied along the inner surface 12a suppresses the retention of earth and sand on the inner surface 12a.

In the method for transporting earth and sand according to the eleventh embodiment, the air supplied along the inner surface 12a of the transport hose 12 is conveyed together with the earth and sand. Specifically, air is sent from the compressor 73 to the inflow nozzle 74, and air is supplied from the inflow nozzle 74 along the inner surface 12a (step of supplying air). At this time, the inflow amount of air may be adjusted to supply air so that the flow velocity on the inner surface 12a side becomes faster. Then, as in each of the above-described embodiments, the earth and sand are transported (conveyed) inside the transport pipe 10 to complete a series of steps. The air supply unit 72 may supply air continuously or intermittently. In this way, the timing at which the air supply unit 72 operates can be changed as appropriate.

As described above, according to the eleventh embodiment, in order to convey the earth and sand together with the air supplied along the inner surface 12a of the transport hose 12, the earth and sand on the inner surface 12a side and the earth and sand are carried by the air supplied along the inner surface 12a. The flow velocity of air can be increased. Therefore, since the fluidity of the earth and sand on the inner surface 12a can be increased, the adhesion of the earth and sand on the inner surface 12a can be suppressed.

(12th Embodiment)
Next, the transport device according to the twelfth embodiment will be described with reference to FIG. In FIG. 16, the earth and sand are painted in dark gray, and the liquid 80, which is not compatible with the earth and sand described later, is painted in light gray. The transport device according to the twelfth embodiment includes a liquid supply unit 76 (supply means) for supplying a liquid 80 that is incompatible with earth and sand. The liquid supply unit 76 supplies a liquid 80 that is not compatible with the earth and sand as a fluid that is conveyed together with the earth and sand and suppresses the retention of the earth and sand on the inner surface 10a of the transport pipe 10.

The liquid 80 that is incompatible with earth and sand is, for example, a liquid that does not mix with earth and sand and does not dissolve with earth and sand. As the liquid 80, for example, a fluorine-based liquid or a fire extinguishing liquid can be used. The fluorinated liquid is, for example, a novelc (registered trademark) high-performance liquid. The fluorine-based liquid may be a fluorine-based solvent containing hydrofluoroether. The fire extinguishing liquid is, for example, a water-forming foam fire extinguishing agent.

The liquid supply unit 76 is provided with a tank 77 for storing the liquid 80, a pump 78 for pumping the liquid 80 from the tank 77 and pumping the liquid 80, a container 81 for the liquid 80 pumped from the pump 78, and the pump 78. A pipe 79 extending from the container 81 to the container 81 is provided. The liquid 80 pumped from the tank 77 by the pump 78 flows inside the pipe 79 in the direction indicated by the arrow G. The end portion 79a of the pipe 79 is open above the container 81, and the liquid 80 flowing inside the pipe 79 is discharged from the end portion 79a into the inside of the container 81.

Sediment is stored in the container 81 in advance, and the earth and sand and the liquid 80 are stored in the container 81 in a state of being separated from each other. The earth and sand and the liquid 80 contained in the container 81 are conveyed inside the transfer pipe 10 in the same manner as in each of the above-described embodiments. At this time, since the liquid 80 is a liquid that is incompatible with the earth and sand, even if it is transported together with the earth and sand, it does not mix with the earth and sand and remains separated from the earth and sand.

When the earth and sand and the liquid 80 are conveyed inside the transfer pipe 10, the liquid 80 is in a state of covering the surface of the earth and sand. The liquid 80 enhances the fluidity of the earth and sand with respect to the inner surface 10a of the transport pipe 10. That is, the liquid 80 supplied by the liquid supply unit 76 suppresses the retention of earth and sand on the inner surface 10a.

The liquid 80 is discharged together with the earth and sand at the end 12e of the transport hose 12. The liquid 80 and the earth and sand are discharged from the terminal 12e and then put into the sieve 82. The sieve 82 may be, for example, the same device as the vibration sieve 54 described above. The sieve 82 sifts the charged liquid 80 and the earth and sand, and separates the liquid 80 from the earth and sand. The liquid 80 separated by the sieve 82 can be reused as the liquid 80 transported inside the transport pipe 10. The vibrating sieving machine 82 may be a device separate from the transfer device, or may be integrated with the transfer device.

In the method for transporting earth and sand according to the twelfth embodiment, the liquid 80 is transported together with the earth and sand. Specifically, the liquid 80 pumped from the tank 77 by the pump 78 is pumped inside the pipe 79 and discharged into the container 81. As a result, the earth and sand and the liquid 80 are combined inside the container 81. Then, as in each of the above-described embodiments, the liquid 80 and the earth and sand are transported (conveyed) inside the transport pipe 10 to complete a series of steps.

As described above, according to the twelfth embodiment, when the earth and sand are conveyed inside the transport hose 12, the surface of the earth and sand is covered with the liquid 80, so that the flow of the earth and sand with respect to the inner surface 12a of the transfer hose 12 You can improve your sex. Therefore, it is possible to suppress the adhesion of earth and sand to the inner surface 12a. Further, the liquid 80 that covers the surface of the earth and sand is incompatible with the earth and sand, and the mixing of the earth and sand and the liquid 80 is suppressed, so that the mud formation of the earth and sand can be suppressed. Therefore, it is possible to easily process the earth and sand after coming out of the transport hose 12. Further, since the liquid 80 is incompatible with the earth and sand, the liquid 80 can be reused by separating the earth and sand and the liquid 80 after transporting the earth and sand.

(13th Embodiment)
Next, the earth and sand transporting device according to the thirteenth embodiment will be described with reference to FIG. As shown in FIG. 17, in the transfer device according to the thirteenth embodiment, a plurality of spiral grooves 83 are formed on the inner surface 10a of the transfer pipe 10. The spiral groove 83 is a spiral groove, and in FIG. 17, one of a plurality of spiral grooves 83 is shown. However, in reality, a plurality of spiral grooves 83 are formed along the longitudinal direction of the transport pipe 10. The spiral groove 83 is provided, for example, over substantially the entire area in the transport direction inside the transport pipe 10.

As shown in FIG. 18A, when viewed from the longitudinal direction of the transport pipe 10, each spiral groove 83 has a substantially rectangular shape, and a plurality of spiral grooves 83 are continuously arranged in the circumferential direction. A convex portion 84 is formed between the spiral grooves 83. The width W1 of each spiral groove 83 and the width W2 of the convex portion 84 are, for example, substantially equal to each other. The width W1 and the width W2 do not have to be equal to each other, but when the width W1 and the width W2 are substantially equal, the effect that the air flow inside the transport pipe 10 is less likely to be disturbed can be obtained. Be done.

The arrangement intervals of the spiral grooves 83 adjacent to each other in the circumferential direction are, for example, 50 mm or more and 2000 mm or less. The arrangement interval of the spiral grooves 83 adjacent to each other in the circumferential direction is the midpoint in the circumferential direction of one spiral groove 83 and the midpoint in the circumferential direction of the other spiral groove 83 adjacent to the one spiral groove 83. The distance. For example, the arrangement interval of the spiral grooves 83 adjacent to each other in the circumferential direction is about 150 mm when the earth and sand is sandy soil, and about 1500 mm when the earth and sand is cohesive soil. Sandy soil is soil having an average particle size of 2 mm or less. Cohesive soil is earth and sand aggregated to an average particle size of about 20 mm. As shown in FIG. 18B, the pitch L1 of the spiral groove 83 is, for example, 10 mm or more and 100 mm or less. The pitch L1 is the distance in the longitudinal direction of the transport pipe 10 from the point P1 to the point P2 that makes one round along the spiral groove 83 with reference to an arbitrary point P1 of the spiral groove 83.

Since the plurality of spiral grooves 83 are formed on the inner surface 10a of the transport pipe 10, the fluid flowing inside the transport pipe 10 spirally flows along the inner surface 10a. As the fluid spirally flows along the inner surface 10a, a swirling motion is given to the earth and sand conveyed together with the fluid inside the conveying pipe 10. As a result, the straightness of the earth and sand transported inside the transport pipe 10 can be improved. Therefore, the spirally flowing fluid suppresses the retention of earth and sand on the inner surface 10a.

In the method for transporting earth and sand according to the thirteenth embodiment, the fluid is spirally circulated along the inner surface 10a of the transport pipe 10. Specifically, a transport pipe 10 having a plurality of spiral grooves 83 formed on the inner surface 10a is prepared, and earth and sand are transported (conveyed) inside the transport pipe 10. At this time, since the plurality of spiral grooves 83 are formed on the inner surface 10a, the fluid flowing inside the transport pipe 10 spirally flows along the inner surface 10a. By transporting the earth and sand together with the fluid flowing in a spiral shape, the earth and sand are transported while being given a turning motion. Through the above steps, the transportation of earth and sand is completed.

As described above, according to the thirteenth embodiment, the fluid flows spirally along the inner surface 10a of the transport pipe 10, so that the earth and sand transported together with the fluid inside the transport pipe 10 is given a swirling motion. As a result, the straightness of the earth and sand conveyed inside the transfer pipe 10 can be improved, so that the adhesion of the earth and sand to the inner surface 10a can be suppressed.

Although various embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and the gist described in each claim is modified or applied to others without changing the gist. You may.

In the above-described embodiment, the soil transport method and the transport device used at the construction site have been described, but the transport method and the transport device may be used at a place other than the construction site. The transport pipe of the present invention is not limited to the transport pipe 10, and may be, for example, a mixer 90 as shown in FIG. FIG. 19 is a schematic cross-sectional view showing a mixer 90 which is an example of a means for transporting earth and sand. The mixer 90 is a device for transporting earth and sand while mixing and stirring the earth and sand.

The mixer 90 has a tubular shape, and earth and sand containing fine-grained material and coarse-grained material can be circulated inside the mixer 90. The mixer 90 has a tubular body 91 (conveying pipe) formed by connecting a plurality of tubular portions in the axial direction, and a plurality of projecting portions 92 protruding from the inner surface 91a of the tubular body 91 in the out-of-plane direction. Have. The tubular portions constituting the tubular body 91 are rotatable about their axes, and one tubular portion rotates in the opposite direction of the other tubular portions adjacent in the axial direction. Sediment passes through the inside of the cylinder 91, and the earth and sand passing through the inside of the cylinder 91 is agitated and mixed by the rotation of each cylinder.

When the earth and sand are introduced into the cylinder 91, they are conveyed inside the cylinder 91 while being agitated and mixed by the rotation of each cylinder by a rotating means (conveying means) (not shown) and the collision with each protrusion 92. Will be done. The rotating means and the protruding portion 92 correspond to the means for transporting earth and sand. For the mixer 90 that conveys the earth and sand in this way, at least one of the low friction material, the contact reducing material, and the fluid that suppresses the retention of the earth and sand in the above-mentioned first to thirteenth embodiments is adopted. The same effect as that of each of the above-described embodiments can be obtained. That is, it is possible to suppress the adhesion of earth and sand to the inner surface 91a of the cylinder 91 of the mixer 90.

In the above-described first embodiment, an example in which the water-repellent coat layer 30 is provided over substantially the entire longitudinal direction inside the transport pipe 10 has been described, but the present invention is not limited to this example. The water-repellent coat layer 30 may be provided at any part of the transport pipe 10, and the location of the water-repellent coat layer 30 can be changed as appropriate. The water-repellent coat layer 30 may be provided on any part of the suction pipe 11, the transport hose 12, and the pipe 13, for example.

The low friction material 40 of the second embodiment may be connected at a place other than the end portion 40a, for example. Each sheet 40s may extend in a direction other than the direction along the inner surface 12a of the transport hose 12, and may extend in the radial direction of the transport hose 12, for example. Further, the shape and number of each sheet 40s are not particularly limited. For example, each sheet 40s may have a shape with rounded corners, and the number of sheets 40s may be one.

In the second and third embodiments described above, an example in which the low friction materials 40 and 41 are arranged inside the second hose 12d has been described, but the present invention is not limited to this example. For example, the low friction materials 40 and 41 may be arranged inside any of the first hose 12c, the pipe 13, and the suction pipe 11. That is, the low friction materials 40 and 41 may be arranged at any position inside the transport pipe 10.

In the second and third embodiments described above, it is assumed that the low friction materials 40 and 41 are made of fluororesin, but the material of the low friction materials 40 and 41 does not have to be fluororesin. The low friction materials 40 and 41 may be made of, for example, hard polyethylene, polypropylene or vinyl chloride.

In the fourth embodiment described above, an example in which the uneven coating layer 43 is provided inside the transport pipe 10 over substantially the entire longitudinal direction has been described, but the concave-convex coat layer 43 is provided in any part of the transport pipe 10. The arrangement location of the uneven coating layer 43 can be changed as appropriate. The uneven coating layer 43 may be provided on any part of the suction pipe 11, the transport hose 12, and the pipe 13, for example.

In the fifth embodiment described above, an example in which the sandy material 50 is sent into the ejector 22 and the sandy material 50 is transported together with the earth and sand on the downstream side of the ejector 22 has been described. However, the place where the sandy material 50 is sent is not particularly limited. The sandy material 50 may be fed to any position inside the transport pipe 10, and for example, the sandy material 50 may be fed to any of the suction pipe 11, the transport hose 12, and the pipe 13.

In the seventh embodiment described above, an example of supplying liquid nitrogen to the earth and sand for freezing and solidifying the earth and sand has been described, but the means for freezing and solidifying the earth and sand is not limited to liquid nitrogen. For example, the means for freezing and solidifying may be dry ice or liquid oxygen.

In the eighth embodiment described above, an example in which the water supply unit 63 is arranged on the second hose 12d has been described, but the location of the water supply unit 63 is not limited to the above example. For example, the water supply unit 63 may be arranged in any of the first hose 12c, the pipe 13, and the suction pipe 11. That is, the water supply unit 63 may be arranged at any position of the transport pipe 10. Further, the number of water supply units 63 is not particularly limited.

In the ninth embodiment described above, an example in which the supply means for supplying water is the vibrators 68 and 69 has been described, but the number, type and arrangement location of the vibrators 68 and 69 can be changed as appropriate. For example, a vibrator may be arranged in the first hose 12c, the pipe 13, or the suction pipe 11.

In the eleventh embodiment described above, an example in which the air supply unit 72 is arranged on the second hose 12d has been described, but the number, type, and arrangement location of the air supply unit 72 are not limited to the above example. For example, the air supply unit 72 may be arranged in any of the first hose 12c, the pipe 13, and the suction pipe 11.

In the twelfth embodiment described above, an example in which the earth and sand and the liquid 80 are stored in the container 81 and then transported in the transport pipe 10 has been described, but the transport method, material and type of the liquid 80 are not limited to the above examples. .. For example, the liquid 80 may be flowed inside the transport pipe 10 in advance, and the earth and sand may be transported to the transport pipe 10 in the state where the liquid 80 has flowed.

In the thirteenth embodiment described above, an example in which the spiral groove 83 is formed on the inner surface 10a of the transport pipe 10 has been described, but the shape, size, number, and arrangement mode of the spiral groove 83 are appropriately changed. For example, a spiral groove 83 may be formed in any of the first hose 12c, the pipe 13, and the suction pipe 11.

In the above-described embodiment, an example in which the transport means includes the compressor 21 and the ejector 22 has been described, but the configuration of the transport means can be changed as appropriate. The transport means may be, for example, a vacuum pump, a pressurizing means of a pressurizing pump, or a suction means of a vacuum truck or the like.

In the above-described embodiment, the transport pipe 10 including the suction pipe 11, the transport hose 12, and the pipe 13 has been described. However, the transport pipe is not limited to the one including the suction pipe 11, the transport hose 12, and the pipe 13, and the configuration of the transport pipe can be changed as appropriate. For example, it may be a transport pipe provided with only the suction pipe 11 or only the transport hose 12, or may be a transport pipe from which the suction pipe 11 is removed from the transport hose 12. Further, the suction pipe 11, the transport hose 12, and the pipe 13 may be a transport pipe provided with another pipeline having a different shape, size, and material.

Further, the transport method and the transport device according to the present invention include the water-repellent coat layer 30 of the first embodiment, the strip-shaped low-friction material 40 of the second embodiment, and the tubular low-friction material 41 of the third embodiment. Concavo-convex coat layer 43 of the fourth embodiment, sandy material 50 of the fifth embodiment, agglomerating material 56 of the sixth embodiment, freeze-solidifying means 59 of the seventh embodiment, water supply unit 63 of the eighth embodiment. , The vibrators 68 and 69 of the ninth embodiment, the coil of the tenth embodiment, the air supply unit 72 of the eleventh embodiment, the liquid 80 which is incompatible with the earth and sand of the twelfth embodiment, and the spiral groove 83 of the thirteenth embodiment. A combination of a plurality of them may be used.

1 ... Conveying device, 5 ... Brazing material (granular low friction material), 6 ... Concave, 7 ... Convex, 10 ... Conveying pipe, 10a ... Inner surface, 11 ... Suction pipe (conveying pipe), 11a ... Tip, 12 ... Conveying hose (conveying pipe), 12a ... Inner surface, 12b ... Outer surface, 12c ... First hose, 12d ... Second hose, 12e ... End, 13 ... Pipe, 20 ... Conveying means, 21 ... Compressor (conveying) Means), 22 ... Ejector (conveying means), 22a ... Introduction pipe, 22b ... Branch pipe, 22c ... Confluence pipe, 23 ... Hose, 30 ... Water repellent coat layer (low friction material), 30a ... Surface, 40, 41 ... Low friction material, 40a, 40b, 41a, 41b ... end, 40c ... slit, 40s ... sheet, 43 ... uneven coat layer (low friction material), 43a ... surface, 50 ... sandy material, 51 ... supply piping, 52 ... Ejector, 54 ... Vibration sieving machine, 56 ... Aggregating material, 57 ... Granulator, 58 ... Transport object, 59 ... Freezing and solidifying means, 60 ... Injection nozzle, 61 ... Rotating drum, 63 ... Water supply unit, 64 ... Tank, 65 ... Pump, 66 ... Injection nozzle, 67 ... Piping, 68, 69 ... Vibrator, 70 ... Container, 70a ... Outer bottom surface, 72 ... Air supply unit, 73 ... Compressor, 74 ... Inflow nozzle, 75 ... Piping , 76 ... liquid supply, 77 ... tank, 78 ... pump, 79 ... piping, 79a ... end, 80 ... liquid, 81 ... container, 82 ... sieve, 83 ... spiral groove, 84 ... convex, 90 ... mixer, 91 ... Cylinder, 91a ... Inner surface, 92 ... Projection, H ... Height, L1 ... Pitch, P1, P2 ... Point, W1, W2 ... Width.

Claims (7)

It is a transport method that transports earth and sand inside the transport pipe.
The process of transporting the earth and sand inside the transport pipe by the transport means, and
A step of arranging a low-friction material for reducing friction between the inner surface of the transport pipe and earth and sand is provided inside the transport pipe .
The transport means includes a compressor that supplies compressed air, an ejector that sends compressed air from the compressor to the transport pipe, and a hose that connects the compressor and the ejector.
In the step of arranging the low friction material, a transfer method in which the low friction material is transferred to the inside of the transfer pipe by the operation of the compressor and the ejector. The low friction material has water repellency and is granulated before being placed inside the transport tube.
In the step of arranging the low-friction material, the low-friction material is poured into the inside of the transport pipe by the transport means, and the low-friction material is brought into contact with the inner surface to bring the inner surface into the low-friction material. The transport method according to claim 1, wherein the coating method is coated with. The transport method according to claim 1, wherein in the step of arranging the low friction material, the low friction material is arranged so that the low friction material extends in a strip shape inside the transport pipe. The transport method according to claim 1, wherein in the step of arranging the low friction material, the low friction material is arranged so that the low friction material extends in a tubular shape along the inner surface of the transport pipe. The transport method according to claim 3 or 4, wherein the low friction material is composed of a fluororesin. The transport method according to claim 1, wherein in the step of arranging the low friction material, fine irregularities are formed on the inner surface as the low friction material. A transport pipe for transporting earth and sand inside,
A transport means for transporting earth and sand inside the transport pipe, and
A low-friction material, which is arranged inside the transport pipe and reduces friction between the inner surface of the transport pipe and earth and sand, is provided .
The transport means includes a compressor that supplies compressed air, an ejector that sends compressed air from the compressor to the transport pipe, and a hose that connects the compressor and the ejector.
A transport device that transports the low-friction material inside the transport pipe by operating the compressor and the ejector.

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