JP7402135B2 - Earth and sand transport equipment and sand transport method - Google Patents

Description

The present disclosure relates to an earth and sand transport device and an earth and sand transport method that transport earth and sand inside a transport pipe.

Various types of earth and sand conveying devices and earth and sand conveying methods have been known for conveying earth and sand. Patent Document 1 describes a waste soil suction treatment device. The suction treatment device includes a first suction hose that suction-transfers waste soil from a hole in the soil, and a second suction hose that suction-transports waste soil to a waste soil box.

A branch pipe is connected between the first suction hose and the second suction hose, and the first suction hose, the second suction hose, and the holding pipe are connected to the branch pipe. Compressed air is supplied to the second suction hose via the holding pipe and the branch pipe. This supply of compressed air facilitates suction of waste soil into the second suction hose.

Patent Document 2 describes a conveyance device used in excavation work. The conveyance device includes a suction pipe having a suction port for sucking cutting debris obtained as a result of excavation, a device main body to which the suction pipe is connected, and a conveyance pipe extending from the device main body to the transport vehicle. The main body of the device has a branch pipe, and a suction pipe, a conveyance pipe, and an air supply pipe are connected to the branch pipe. By supplying compressed air to the branch pipe via the air supply pipe, excavated debris is sucked up from the suction pipe and transported to the transport vehicle.

Japanese Patent Application Publication No. 2011-169046 Japanese Patent Application Publication No. 2004-169335

The above-mentioned earth and sand transport device and transport device include a suction pipe that sucks up the earth and sand, a transport pipe that transports the earth and sand sucked into the suction pipe, a branch pipe that connects the suction pipe and the transport pipe, and a branch pipe that supplies compressed air to the branch pipe. It is equipped with an air pipe to send the air. Thus, it is necessary to prepare a branch pipe for supplying compressed air to the conveying pipe. Therefore, it is necessary to use special branch pipes to transport the earth and sand.

Furthermore, as described above, when transporting earth and sand using compressed air supplied via a branch pipe, there is a possibility that clogging may occur inside the transport pipe depending on the installation situation of the transport pipe. Therefore, there is a concern that the inside of the conveying pipe may be clogged with earth and sand, and the transportability of earth and sand may deteriorate, so there is room for improvement in terms of the transportability of earth and sand.

An object of the present disclosure is to provide an earth and sand transporting device and an earth and sand transporting method that can suppress clogging of earth and sand inside a transport pipe and improve earth and sand transportability.

An earth and sand transport device according to the present disclosure includes a steel pipe connected to a transport pipe for transporting earth and sand, an ejector that sucks earth and sand into the steel pipe and transports the earth and sand to the transport pipe, and an ejector for transporting the earth and sand to the steel pipe of the ejector. a compressor that sends compressed air of is longer than the length of the ejector .

This earth and sand transport device includes a transport pipe for transporting earth and sand, an ejector having a steel pipe, and a compressor. When the compressor supplies compressed air to the steel pipe of the ejector, the steel pipe of the ejector sucks the earth and sand, and the earth and sand are transferred to the transport pipe. is transported. Therefore, by sending compressed air from the compressor into the steel pipe of the ejector, the earth and sand can be sucked and transported. In addition to the compressor and the ejector, this earth and sand transport device includes an auxiliary air device that injects air directly onto the inner surface of at least one of the transport pipe and the steel pipe. Therefore, by providing an auxiliary air device that injects air directly to the inner surface separately from the compressor and ejector, it is possible to remove dirt from adhering to the inner surface, thereby making it difficult for the inside of the conveyor pipe to become clogged. Further, since the auxiliary air device is provided separately from the ejector, there is no need to prepare a special ejector such as the branch pipe described above, and a ready-made ejector can be used. Therefore, since the auxiliary air device injects air directly to the inner surface, dirt adhering to the inner surface can be removed without using a special branch pipe, making it difficult for dirt to clog the inside of the conveyor pipe. I can do it. Therefore, the transportability of earth and sand can be improved.

The auxiliary air device may intermittently inject air onto the inner surface of the steel pipe. In this case, since air is injected directly into the ejector's steel pipe, the air flows into the boundary between the ejector's steel pipe and the conveyor pipe, which is prone to becoming clogged with dirt. can be suppressed. Moreover, by intermittently injecting air into the inner surface of the steel pipe of the ejector, it becomes possible to separate the timing of transporting the earth and sand and the timing of air injection.

The auxiliary air device is an air injection device that has a main body that extends in a tubular shape, and an air injection section that has an air injection hole that opens in a direction intersecting the longitudinal direction at one end of the main body in the longitudinal direction. Alternatively, air may be directly injected from the air injection part onto the inner surface of the steel pipe . In this case, an air injection tool having an air injection hole that opens in a direction crossing the longitudinal direction is inserted into the steel pipe or conveyance pipe of the ejector, and air is injected directly from the air injection hole into the inner surface of the steel pipe or conveyance pipe. Ru. Therefore, since air can be directly injected to the inner surface with the air injection holes brought close to the inner surface, it is possible to more reliably suppress the adhesion of dirt and sand to the inner surface.

The air injection device is movable along the axial direction of the steel pipe of the ejector, and may directly inject air onto the inner surface of the steel pipe while moving in the axial direction. In this case, air can be directly injected onto the inner surface of the steel pipe while moving the air injection device along the axial direction of the steel pipe, so that the adhesion of earth and sand on the steel pipe and the conveyor pipe connected to the steel pipe can be more effectively suppressed. I can do it.

The air injection tool may directly inject air onto the inner surface of the steel pipe while moving in the axial direction and rotating around the axis of the steel pipe . In this case, by injecting air directly onto the inner surface of the steel pipe while rotating the air injection tool, air can be evenly injected onto the inner surface of the steel pipe. Furthermore, by injecting air while rotating, even when using an air injection device having a simple configuration such as an elbow pipe, air can be evenly injected by rotation.

The earth and sand transport device described above may include a pressure measurement section that measures the pressure inside the transport pipe, and a control section that controls the auxiliary air device according to the pressure measurement result by the pressure measurement section. In this case, since the control section controls the auxiliary air device according to the pressure inside the conveying pipe, air can be injected according to the pressure. Therefore, by controlling the air injection according to the measured pressure by the control unit, air injection to the inner surface can be efficiently and automatically performed.

The earth and sand conveying device described above may include a timing setting means that can set the timing at which the ejector conveys the earth and sand and the timing at which the auxiliary air device injects air directly onto the inner surface of the steel pipe . In this case, the timing setting means makes it possible to set the timing of transporting the earth and sand and the timing of jetting air to the inner surface. Therefore, since it is possible to transport the earth and sand and to inject air to the inner surface in a preset cycle, it is possible to efficiently transport the earth and sand while removing the adhesion of earth and sand to the inner surface.

While the ejector transports the earth and sand, an auxiliary air device may inject air directly onto the inner surface of the steel pipe . In this case, it becomes possible to transport the earth and sand by suction by the ejector and to inject air to the inner surface by the auxiliary air device. Therefore, since the earth and sand can be transported while removing the earth and sand from adhering to the inner surface by injecting air to the inner surface, the earth and sand can be transported more efficiently.

The conveyance pipe includes a rising portion extending upward, and the auxiliary air device may inject air into a portion of the earth and sand conveyance path of the conveyance pipe upstream of the rising portion. When the conveyance pipe includes a rising portion extending upward, the upstream portion of the rising portion may be easily clogged with earth and sand. However, when air is injected to the upstream portion of the rise as described above, air can be directly injected to the upstream portion that is likely to become clogged. Therefore, since air can be directly injected into areas where dirt is likely to become clogged, the transportability of dirt can be further improved.

The earth and sand transport method according to the present disclosure is a method for transporting earth and sand using a transport pipe for transporting earth and sand, and an ejector having a steel pipe connected to the transport pipe, and the earth and sand is transported by sending compressed air into the steel pipe. A step in which the auxiliary air device injects air directly onto the inner surface of at least one of the conveyor pipe and the steel pipe, the auxiliary air device has a rod-shaped body portion, and the auxiliary air device has a rod-shaped main body portion; is longer than the length of the ejector .

In this earth and sand transport method, earth and sand are transported using a transport pipe that transports the earth and sand, and an ejector that has a steel pipe connected to the transport pipe. Compressed air is supplied to the steel pipe of the ejector, and the steel pipe of the ejector sucks the earth and sand, thereby conveying the earth and sand to the conveying pipe. In addition to transporting the earth and sand by the ejector, air is directly injected onto the inner surface of at least one of the transport pipe and the steel pipe. Therefore, as with the above-mentioned earth and sand conveying device, by injecting air directly to the inner surface, separate from the ejector, it is possible to remove the earth and sand adhering to the inner surface, making it difficult for clogging to occur inside the conveyor pipe. . Moreover, by injecting air to the inner surface separately from transporting the earth and sand by the ejector, there is no need to prepare a special ejector such as the branch pipe described above, and an off-the-shelf ejector can be used. Therefore, the adhesion of dirt and sand can be removed by direct injection of air to the inner surface without using a special branch pipe, so that clogging of the inside of the conveyance pipe with sand and sand can be prevented. As a result, the transportability of earth and sand can be improved.

According to the present disclosure, it is possible to suppress clogging of earth and sand inside a conveyance pipe and improve conveyability of earth and sand.

FIG. 1 is a diagram schematically showing an earth and sand transport device according to an embodiment. FIG. 2 is a partial sectional view showing an ejector of the earth and sand conveying device shown in FIG. 1. FIG. FIG. 3 is a cross-sectional view of a steel pipe showing an auxiliary air device inserted into the steel pipe of the ejector of FIG. 2; (a) is a graph schematically showing time-series data of the effective diameter of the conveyance pipe when earth and sand are conveyed without directly injecting air. (b) is a graph schematically showing time-series data of the effective diameter of the conveyance pipe when earth and sand are conveyed while performing direct air injection. (a) is a cross-sectional view showing an auxiliary air device different from that shown in FIG. 3; (b) is a sectional view showing the auxiliary air device and steel pipe of FIG. 5(a). (a) and (b) are cross-sectional views schematically showing a hopper connectable to the ejector of FIG. 2. FIG. 2 is a diagram schematically showing a compressor, a switching section, a pipe line, and an air supply path of the earth and sand conveying device of FIG. 1. FIG. FIG. 2 is a cross-sectional view showing an example of an auxiliary air device that supplies air to the inside of the transport pipe of the earth and sand transport device in FIG. 1. FIG. It is a figure showing the auxiliary air device concerning a modification. 10 is an enlarged perspective view of the auxiliary air device of FIG. 9. FIG. It is a figure which shows the pneumatic assistance tool based on a modification. It is a figure which shows typically the earth and sand storage member of the earth and sand conveyance apparatus of FIG. (a) is a cross-sectional view of a conveyance pipe obtained as a result of an experiment in which earth and sand were conveyed without directly injecting air. (b) is a cross-sectional view of a conveyance pipe obtained as a result of an experiment in which earth and sand were conveyed by direct injection of air. (a) is a diagram showing an air auxiliary device according to a modified example. (b) is a cross-sectional view showing a state in which the air auxiliary device shown in FIG. 14(a) is inserted into the steel pipe and the conveying pipe of the ejector.

Hereinafter, embodiments of an earth and sand conveying device and an earth and sand conveying method according to the present disclosure will be described with reference to the drawings. In the description of the drawings, the same or corresponding elements are denoted by the same reference numerals, and redundant description will be omitted as appropriate. For ease of understanding, some parts of the drawings may be simplified or exaggerated, and the dimensional ratios and the like are not limited to those shown in the drawings.

FIG. 1 is a diagram showing a schematic configuration of an earth and sand conveying device 1 according to this embodiment. As shown in FIG. 1, the earth and sand transport device 1 is used to transport earth and sand B at a construction site A, for example. As an example, at a construction site A, the ground G is being excavated in order to build a building structure, and the earth and sand B produced by the excavation is transported by the earth and sand transport device 1.

After the building structure is built, the excavated area may be backfilled with earth and sand B, and the earth and sand B necessary for backfilling may be transported by the earth and sand conveying device 1. The earth and sand transport device 1 may be an earth and sand transport system that transports earth and sand B excavated at the construction site A or earth and sand B necessary for backfilling.

The earth and sand transport device 1 includes, for example, a first transport pipe 2 that transports earth and sand B inside, a second transport pipe 3 connected to the first transport pipe 2, and a second transport pipe 3 in the transport route of earth and sand B. A third transport pipe 4 located downstream of the transport pipe 3 is provided. Below, the first conveyance tube 2, the second conveyance tube 3, and the third conveyance tube 4 may be collectively referred to as a conveyance tube 5.

For example, the first transport pipe 2 is a suction pipe that sucks the earth and sand B, and the second transport pipe 3 is a transport hose that transports the earth and sand B sucked from the first transport pipe 2. The first transport pipe 2 is lifted by the worker M, for example, and sucks the earth and sand B with the suction port of the first transport pipe 2 in contact with the earth and sand B.

Further, the earth and sand transport device 1 includes a transport means 10 that transports the earth and sand B between the second transport pipe 3 and the third transport pipe 4, and a transport means 10 that injects air into the inside of the transport pipe 5 (third transport pipe 4). It includes an auxiliary air device 40 for replenishment, and an earth and sand storage member 70 that stores the transported earth and sand B. The auxiliary air device 40 includes a switching unit 41 that switches the flow path of air from the compressor 11, an air supply path 42 that extends from the switching unit 41 toward the conveyance pipe 5, and connects the air supply path 42 and the conveyance pipe 5 to each other. A connecting portion 45 is provided. The auxiliary air device 40 will be explained in detail later.

The conveying means 10 includes an ejector 12 having a steel pipe 12f that sucks the earth and sand B. The third conveyance pipe 4 is, for example, a conveyance hose extending from the downstream side of the conveyance path of the earth and sand B of the conveyance means 10, and the earth and sand storage member 70 provided on the downstream side of the third conveyance pipe 4 has a The earth and sand B discharged from the conveyor pipe 4 of No. 3 is accumulated. The earth and sand B accumulated in the earth and sand storage member 70 is transported to a predetermined destination, for example.

As an example, the first transport pipe 2 is a hard pipe, and the second transport pipe 3 and the third transport pipe 4 are flexible pipes. A "flexible tube" is, for example, a flexible hose that has enough flexibility to easily change its direction by hand. The second transport pipe 3 and the third transport pipe 4 can be made of, for example, hoses that can be easily bent and have excellent pressure resistance. The second transport pipe 3 and the third transport pipe 4 may be transparent. In this case, the state of the earth and sand B inside the second transport pipe 3 and the third transport pipe 4 can be visually recognized.

For example, the ejector 12 of the transport means 10 is fixed on the ground A1 at the construction site A. The flexible second transport pipe 3 may be longer than the first transport pipe 2. In this case, it becomes possible to move the second transport pipe 3 and the first transport pipe 2 over a wider range with the ejector 12 fixed. For example, the length of the conveyance pipe 5 is 10 m or more and 50 m or less (about 40 m as an example).

Earth and sand B is sucked into the first conveying pipe 2 by the conveying means 10 . The conveying means 10 includes a compressor 11 that sends compressed air, an ejector 12 that accelerates the compressed air from the compressor 11 inside the conveying pipe 5 (third conveying pipe 4), and a pipe that connects the compressor 11 and the ejector 12 to each other. 13. The conduit 13 is, for example, a flexible pipe (for example, a hose).

The compressor 11 is mounted on a truck, for example. Compressor 11 sends compressed air to ejector 12 via conduit 13 . The ejector 12 accelerates the compressed air sent from the compressor 11 through the pipe line 13 and generates an air flow in the transport direction D of the earth and sand B.

FIG. 2 is a partial cross-sectional view showing an example of the ejector 12. As shown in FIGS. 1 and 2, the ejector 12 includes an introduction pipe 12b into which compressed air K from the compressor 11 is introduced, a branch pipe 12c branching from the introduction pipe 12b, and an introduction pipe 12b of the branch pipe 12c. It includes a merging pipe 12d that joins on the opposite side of the merging pipe 12d, and a steel pipe 12f extending from the merging pipe 12d to the third conveying pipe 4.

Compressed air K from the compressor 11 is sent into the introduction pipe 12b. The compressed air K sent into the introduction pipe 12b flows into each of the branch pipes 12c, passes through each branch pipe 12c, joins at the merging pipe 12d, and then flows along the steel pipe 12f and the third conveyance pipe 4. .

As the compressed air K flows inside the ejector 12, the flow of the compressed air K is accelerated, and negative pressure is generated inside the second conveyance pipe 3 and the first conveyance pipe 2 located upstream of the ejector 12. . This negative pressure causes the earth and sand B to be sucked into the steel pipe 12f of the ejector 12 and into the transport pipe 5 from the suction port of the first transport pipe 2. Then, the earth and sand B is transported in the transport direction D inside the transport pipe 5.

As shown in FIG. 3, the earth and sand conveying device 1 according to this embodiment includes an auxiliary air device 20 that injects air R onto the inner surface 12g of the steel pipe 12f. For example, the auxiliary air device 20 includes a main body portion 21 that extends in a tubular shape, and an air injection portion 22 that has an air injection hole 22b that opens in a direction intersecting the longitudinal direction L at one end of the main body portion 21 in the longitudinal direction L. This is the injection tool 20A. The air injection device 20A is, for example, an elbow tube whose tip is bent into an L-shape. For example, the air injection device 20A is inserted into the steel pipe 12f with the second conveyance pipe 3 removed from the ejector 12.

The air injection tool 20A is movable inside the steel pipe 12f along the axial direction C, which is the direction in which the axis X of the steel pipe 12f extends. Further, the air injection tool 20A is rotatable around the axis X. In this way, since the air injection tool 20A is movable along the axial direction C and rotatable around the axis X, the air R is directly injected onto a wide area of the inner surface 12g of the steel pipe 12f. becomes possible. "Direct injection" means that the air from the air injection port directly hits the inner surface without intervening anything between the air injection port and the inner surface.

The auxiliary air device 20 also includes at least one of a moving mechanism that moves the air injection device 20A along the axial direction C and a rotation mechanism that rotates the air injection device 20A around the axis X. A control unit that controls the rotation mechanism may also be provided. In this case, since the air injection tool 20A can be automatically moved or rotated, the air R can be directly injected onto the inner surface 12g more efficiently.

The main body portion 21 has a rod shape. The length of the main body portion 21 (the length in the longitudinal direction L) is, for example, greater than or equal to the length of the ejector 12 (the combined length of the steel pipe 12f and the length of the portion of the ejector 12 other than the steel pipe 12f). be. This makes it possible to move the air injection section 22 of the auxiliary air device 20 from one end of the steel pipe 12f to the other end, making it possible to inject the air R to all regions of the inner surface 12g.

When the width (outer diameter) of the main body portion 21 is d (mm) and the inner diameter of the steel pipe 12f is D (mm), the value of d/D may be, for example, 0.25 or more and 0.80 or less. . When the value of d/D is 0.80 or less, it becomes possible to easily insert the air injection tool 20A into the steel pipe 12f. By having a value of d/D of 0.25 or more, it is possible to stably move the air injection tool 20A inside the steel pipe 12f, and to make it easier to bring the air injection hole 22b closer to the inner surface 12g of the steel pipe 12f. Become.

If the length of the air injection part 22 of the air injection tool 20A in a direction intersecting (orthogonal to, for example) the longitudinal direction L is E, then the value of E/D is, for example, 0.5 or more and 0.9 or less. It's okay. When the value of E/D is 0.9 or less, the air injection tool 20A can be easily moved within the steel pipe 12f. When the value of E/D is 0.5 or more, the air R can be easily injected directly from the air injection hole 22b to the inner surface 12g of the steel pipe 12f.

Direct injection of air R onto the inner surface 12g of the steel pipe 12f (cleaning of the inner surface 12g) using the auxiliary air device 20 (air injection tool 20A) is performed intermittently, for example. As an example, the air R is injected into the inner surface 12g of the steel pipe 12f by the auxiliary air device 20 when the earth and sand B is not being transported.

FIG. 4(a) shows time series data of the effective diameter of the steel pipe 12f when the auxiliary air device 20 does not directly inject air R onto the inner surface 12g of the steel pipe 12f, and FIG. It shows time-series data of the effective diameter of the steel pipe 12f when air R is intermittently injected directly onto the inner surface 12g of the steel pipe 12f by the device 20. "Effective diameter of a steel pipe" is, for example, the ratio of the area of the hollow part (area of the part effective for transporting earth and sand) to the total area of the cross section of the steel pipe cut along a plane perpendicular to the longitudinal direction. It shows.

As shown in FIG. 4(a), when transporting the earth and sand B without directly injecting air R to the inner surface 12g of the steel pipe 12f, the earth and sand B adheres to the inner surface 12g of the steel pipe 12f over time. occurs, and the effective diameter of the steel pipe 12f gradually becomes smaller. On the other hand, as shown in FIG. 4(b), when the auxiliary air device 20 directly injects the air R to the inner surface 12g of the steel pipe 12f on a regular basis (at regular intervals), the direct injection of the air R into the inner surface 12g of the steel pipe 12f is It is possible to restore the effective diameter of the steel pipe 12f by injection. The example in FIG. 4(b) shows an example in which the auxiliary air device 20 directly injects the air R after suctioning and conveying the earth and sand B for 60 seconds to 300 seconds, but as time elapses. However, it can be seen that the effective diameter of the steel pipe 12f does not decrease (does not completely disappear).

As shown in FIG. 3, the auxiliary air device 20 includes, for example, a pressure measurement unit 26, a control unit 27 that controls the auxiliary air device 20 according to the pressure measurement result by the pressure measurement unit 26, and a and a timing setting means 28 that can set the timing for injecting the air R. The pressure measurement unit 26 may be attached to the steel pipe 12f. The pressure measurement unit 26 is, for example, a pressure sensor that measures the pressure inside the steel pipe 12f. As an example, the pressure measuring unit 26 measures the pressure inside the conveying pipe 5 or the steel pipe 12f while being attached to the outer peripheral surface of the conveying pipe 5 or the steel pipe 12f.

The control unit 27 receives the pressure measured by the pressure measurement unit 26 as an electrical signal. Then, the control unit 27 controls the injection of air R from the air injection tool 20A according to the pressure measured by the pressure measurement unit 26. For example, the control unit 27 may input a control signal to the air injection device 20A to cause the air injection device 20A to inject the air R when the pressure measured by the pressure measurement unit 26 exceeds a threshold value. .

The timing setting means 28 is capable of setting, for example, the timing of the injection of air R by the air injection tool 20A. As an example, the timing setting means 28 can set the air R injection time and the air R injection stop time. Further, the timing setting means 28 may be configured to be able to set the timing of transporting the earth and sand B and the timing of jetting (cleaning) the air R by the air jetting tool 20A. The above pressure measuring section 26, control section 27, and timing setting means 28 may be provided in an auxiliary air device 30, an auxiliary air device 40, an auxiliary air device 50, or an auxiliary air device 80, which will be described later.

FIG. 5(a) is a diagram showing a cross section of an auxiliary air device 30 according to a modified example. FIG. 5(b) is a diagram showing a side surface of the auxiliary air device 30 and a cross section of the steel pipe 12f. As shown in FIGS. 5(a) and 5(b), the auxiliary air device 30 includes a main body 31 extending along the longitudinal direction L, and a main body 31 that intersects with the longitudinal direction L at one end of the longitudinal direction L of the main body 31. The air injection tool 30A includes an air injection part 32 having an air injection hole 32b that opens in the direction of the air injection.

The air injection tool 30A, like the air injection tool 20A, is movable inside the steel pipe 12f along the axial direction C of the steel pipe 12f and rotatable about the axis X. Note that the air injection tool 30A has an air injection part 32 including a plurality of air injection holes 32b formed radially, and since the air R is radially ejected from the plurality of air injection holes 32b, the air injection tool 30A rotates about the axis X. Even if this is not done, the air R can be evenly injected onto the inner surface 12g of the steel pipe 12f.

The main body portion 31 has a rod shape, and the length of the main body portion 31 in the longitudinal direction L is equal to or longer than the length of the ejector 12, similar to the air injection tool 20A. Assuming that the width (outer diameter) of the main body portion 31 is f (mm) and the inner diameter of the steel pipe 12f is D (mm), the value of f/D can be the same as the value of d/D described above, for example. It is.

The air injection part 32 includes, for example, the plurality of air injection holes 32b described above, a connection part 32c connected to the main body part 31, and a tip part 32d located on the opposite side of the connection part 32c when viewed from the air injection hole 32b. has. The air injection section 32 has, for example, a disk shape. The diameter (outer diameter) of the connecting portion 32c and the diameter (outer diameter) of the tip portion 32d are the same.

The diameter of the portion where the air injection holes 32b are formed is smaller than the diameter of the connecting portion 32c (tip portion 32d). For example, a plurality of air injection holes 32b are formed so as to line up along the circumferential direction of the air injection part 32, and air R is injected from each air injection hole 32b to the outside of the air injection part 32 in the radial direction. The air R is injected onto the inner surface 12g of the steel pipe 12f by the auxiliary air device 30 (air injection tool 30A), for example, in the same manner as in the auxiliary air device 20.

FIGS. 6(a) and 6(b) are cross-sectional views schematically showing an auxiliary air device 50 according to a further modification. The auxiliary air device 50 is connected to, for example, a hopper 60 into which earth and sand B is input. The hopper 60 is connected to the steel pipe 12f of the ejector 12 via the conveyance pipe 6, for example. The exemplary conveying pipe 6 has a tubular general portion 6b and an enlarged diameter portion 6c connected to the ejector 12.

The hopper 60 includes an earth and sand input section 61 into which earth and sand B is input, an earth and sand inflow section 62 that extends downward from the earth and sand input section 61 and has a space that communicates with the internal space of the conveyor pipe 6, and the earth and sand input section 61 and the earth and sand input section 61. A shutter gate 63 interposed between the inflow portion 62 is provided. The earth and sand input section 61 is, for example, a cylindrical body with a truncated cone shape whose diameter increases upward. A vibrator 64 is fixed.

The earth and sand inflow section 62 has, for example, a box shape. The earth and sand inflow section 62 has an insertion hole 62b through which the auxiliary air device 50 is inserted and which communicates with the internal space of the conveyance pipe 6. The insertion hole 62b is open, for example, in the axial direction C of the steel pipe 12f, and the auxiliary air device 50 inserted into the insertion hole 62b enters the inside of the steel pipe 12f of the ejector 12 via the conveyance pipe 6.

The shutter gate 63 is provided, for example, at the bottom of the earth and sand input section 61, and can be freely inserted and removed in a direction (horizontal direction in FIG. 6) that intersects the direction in which the earth and sand input section 61 and the earth and sand inflow section 62 are lined up. As an example, the shutter gate 63 can be freely inserted and removed in a horizontal direction intersecting the vertical direction in which the earth and sand input section 61 and the earth and sand inflow section 62 are lined up.

By inserting the shutter gate 63 into the earth and sand input section 61 and the earth and sand inflow section 62, it is possible to block the inflow of earth and sand B from the earth and sand input section 61 to the earth and sand inflow section 62. Further, by pulling the shutter gate 63 for the earth and sand input section 61 and the earth and sand inflow section 62, the flow path between the earth and sand input section 61 and the earth and sand inflow section 62 is widened, and the flow path from the earth and sand input section 61 to the earth and sand inflow section 62 is expanded. Sediment B flows in. By adjusting the insertion amount of the shutter gate 63 into the earth and sand input section 61 and the earth and sand inflow section 62, the amount of earth and sand B flowing from the earth and sand input section 61 into the earth and sand inflow section 62 can be adjusted.

The auxiliary air device 50 is, for example, a tubular air injection tool 50A. The air injection device 50A is inserted into the steel pipe 12f of the ejector 12 via the hopper 60 (earth and sand inflow section 62). The air injection tool 50A has a first injection port 51 that opens in an end face located at one end in the longitudinal direction of the air injection tool 50A, and a second injection port 52 that opens in a side surface of the air injection tool 50A.

From the first injection port 51, air R is injected onto the inner surface of the steel pipe 12f via the hopper 60 and the conveying pipe 6, for example. As an example, air R is ejected from the first injection port 51 so as to spread, and the ejected air R is injected along the inner surface 12g of the steel pipe 12f. Note that the air R from the first injection port 51 may be injected onto the earth and sand B to assist in transporting the earth and sand B.

The air injection device 50A includes, for example, a plurality of second injection ports 52. The plurality of second injection ports 52 are, for example, lined up along the circumferential direction of the air injection tool 50A and lined up along the longitudinal direction of the air injection tool 50A. Therefore, by directly injecting air R from each second injection port 52 onto the inner surface 12g with the auxiliary air device 50 inserted into the steel pipe 12f such that the second injection port 52 faces the inner surface 12g of the steel pipe 12f, It becomes possible to efficiently inject the air R over a wide range of the inner surface 12g. Moreover, since the air injection tool 50A is movable along the axial direction C with respect to the steel pipe 12f, the air R is efficiently injected onto the entire inner surface 12g of the steel pipe 12f while moving the air injection tool 50A. can do.

As shown in FIGS. 1 and 7, the earth and sand conveying device 1 includes an auxiliary air device 40 together with the auxiliary air devices 20, 30, and 50, or separately from the auxiliary air devices 20, 30, and 50. For example, the conveyance pipe 5 (third conveyance pipe 4) includes a rising portion 5b extending upward, and the auxiliary air device 40 injects air into a portion on the upstream side of the rising portion 5b.

The switching unit 41 of the auxiliary air device 40 is provided, for example, in a compressed air path (pipe line 13) extending from the compressor 11 to the ejector 12. As an example, the switching unit 41 includes a switching cock 44 that switches the air flow path. For example, by manually switching the switching cock 44, it is possible to switch the flow of compressed air from the compressor 11 to either the pipe line 13 or the air supply line 42.

Note that instead of the example in which compressed air is supplied from the compressor 11 to the conveyance pipe 5 (the third conveyance pipe 4 which is a flexible pipe), a compressor other than the compressor 11 may supply compressed air to the conveyance pipe 5. good. In this case, the auxiliary air device only needs to include the compressor and an air supply path that supplies compressed air from the compressor to the conveyor pipe 5, so the switching section 41 can be omitted, and the configuration of the air supply section can be simplified.

As shown in FIGS. 1 and 8, the auxiliary air device 40 includes a connecting portion 45 that connects the conveying pipe 5 and the air supply path 42 to each other. As an example, the connecting portion 45 is an elbow tube having an opening 45b to which the air supply path 42 is connected. The connecting portion 45 includes, for example, an opening 45b, and a first portion 45c and a second portion 45d that connect a pair of transport pipes 5 (third transport pipes 4) that are spaced apart from each other.

For example, the first portion 45c is a horizontal portion of the L-shape of the elbow pipe (as an example, a portion extending in the horizontal direction), and the second portion 45d is a vertical portion of the L-shape of the elbow pipe (as an example, a vertical portion). (the part extending in the direction). For example, the first part 45c is connected to the upstream side of the earth and sand transport route of the transport pipe 5, and the second part 45d is connected to the downstream side of the earth and sand transport route of the transport pipe 5.

The opening 45b is provided between the first portion 45c and the second portion 45d, and supplies air R from the air supply path 42 to the second portion 45d and the inside of the conveying pipe 5, for example. The air supply path 42 is, for example, a flexible pipe such as a hose or a tube, and is connected to the opening 45b by fitting. Note that the connection structure of the air supply path 42 to the opening 45b is not limited to the example shown in FIG. 8, and can be changed as appropriate.

As described above, by connecting the air supply path 42 to the opening 45b of the connecting portion 45 and supplying the air R to the conveying pipe 5 via the air supply path 42, It becomes possible to supply air R directly to the inner surface 5c. As a result, clogging of the earth and sand B inside the transport pipe 5 is suppressed. The connection of the conveying pipe 5 to each of the first portion 45c and the second portion 45d is performed by, for example, a hose clamp 45f. However, the means for connecting the conveying pipe 5 to the connecting portion 45 is not limited to the hose clamp 45f, and can be changed as appropriate.

FIG. 9 shows an auxiliary air device 80 according to a modified example. The auxiliary air device 80, like the auxiliary air device 40, is provided, for example, at the rising portion 5b of the conveying pipe 5. The auxiliary air device 80 includes an air scoop (air digging tool) 81 that is an air injection tool, and a supply pipe section 85 that supplies the air R from the air scoop 81 to the conveying pipe 5. The supply pipe portion 85 is provided, for example, on the upstream side of the rising portion 5b, similar to the connection portion 45 described above.

As an example, the supply pipe section 85 includes a first attachment section 86 to which the air scoop 81 is attached, a second attachment section 87 to which a portion of the conveyance tube 5 connected to the steel pipe 12f of the ejector 12 is attached, and a second attachment section 87 to which the portion of the conveyance tube 5 connected to the steel pipe 12f of the ejector 12 is attached. A third attachment portion 88 is provided to which the rising portion 5b is attached.

FIG. 10 is an enlarged perspective view of the supply pipe section 85. As shown in FIG. 10, the first attachment part 86 seals the supply pipe part 85 while covering the supply pipe part 85, and supplies an elastic member 86b into which the air scoop 81 is inserted, and an elastic member 86b. It includes a clamp 86c that tightens onto the tube portion 85, and a string-like member 86d that prevents the air scoop 81 from coming off from the elastic member 86b.

The elastic member 86b has an insertion hole 86f into which the air scoop 81 is inserted. For example, the inner diameter of the insertion hole 86f is less than or equal to the outer diameter of the air scoop 81, and the air scoop 81 is held by the elastic member 86b while being pushed into the insertion hole 86f. The clamp 86c clamps an elastic member 86b that covers the supply pipe section 85 to the supply pipe section 85.

The string member 86d includes an annular portion 86g that is tied to the air scoop 81, a curved portion 86h that extends from the annular portion 86g toward the third attachment portion 88, and an annular portion 86j that ties the curved portion 86h to the supply pipe portion 85. has. Since the air scoop 81 is tied to the supply pipe section 85 by the string-like member 86d, it is possible to more reliably prevent the air scoop 81 from coming off from the supply pipe section 85.

FIG. 11 shows an example of an air scoop 81 of the auxiliary air device 80. As shown in FIG. 11, the air scoop 81 extends long in the longitudinal direction D1, and also extends a certain amount in the intersecting direction D2 intersecting the longitudinal direction D1. The air scoop 81 includes, for example, a receiving portion 82 that receives compressed air at one end of the air scoop 81, an injection nozzle 83 located at the other end of the air scoop 81 that injects compressed air, and a receiving portion 82 and an injection nozzle 83. and a handle 84 that connects the two to each other.

As an example, the receiving part 82 includes a mounting part 82b to which an introduction pipe for introducing compressed air into the air scoop 81 is attached, a hose 82c extending from the mounting part 82b, and a compressed air supply path connected to the handle 84. and a valve portion 82d that opens and closes. For example, a male screw is formed on the outer peripheral surface of the attachment portion 82b, and the female screw of the joint portion of the introduction tube is screwed into the male screw, thereby connecting the introduction tube to the receiving portion 82. The hose 82c extends from the attachment portion 82b and is bent at 90 degrees with respect to the attachment portion 82b. The valve portion 82d is, for example, a ball cock, and the compressed air supply path is opened and closed by rotating the grip portion 82f of the valve portion 82d.

The handle 84 extends linearly from the valve portion 82d to the injection nozzle 83, for example. As an example, the handle 84 has a first tubular part 84b connected to the valve part 82d, a second tubular part 84c connected to the injection nozzle 83, and a first tubular part 84b and a second tubular part. and a third tubular portion 84d that connects the tubes 84c to each other. As an example, both the first tubular part 84b and the second tubular part 84c are made of metal, and the third tubular part 84d is made of a flexible material.

The injection nozzle 83 is a tubular portion fixed to the tip of the second tubular portion 84c, and compressed air to be injected to the outside of the air scoop 81 is supplied to the inside of the injection nozzle 83. The injection nozzle 83 of the air scoop 81 is inserted into the supply pipe section 85, for example, and extends from the tip 83b of the injection nozzle 83 located inside the supply pipe section 85 to the supply pipe section 85 and the inner surface of the conveyance pipe 5. Air is injected directly into the Note that instead of the air injection device 20A of the auxiliary air device 20, an air scoop 81 may be inserted into the steel pipe 12f of the ejector 12 to directly inject air onto the inner surface 12g of the steel pipe 12f.

FIG. 12 is an enlarged side view of the earth and sand storage member 70. As shown in FIGS. 1 and 12, the earth and sand storage member 70 is provided at the discharge port 4f located at the downstream end of the transport pipe 5 (third transport pipe 4) in the transport path of the earth and sand B. There is. The earth and sand storage member 70 includes, for example, a lid 72, a container 73 covered by the lid 72, and a bag member 75 accommodated in the container 73.

The earth and sand storage member 70 further includes, for example, a threaded pipe joint 71. As an example, the lid part 72 includes an inflow part 72b into which the transported earth and sand B flows into the inside of the transport pipe 5, and a fixing part 72c to which the discharge port 4f located at the downstream end of the transport pipe 5 is fixed. , a sealing portion 72d that seals the bag member 75 and the container 73. A threaded pipe fitting 71 is connected to the discharge port 4f, and the threaded pipe fitting 71 has a male screw portion 71b that is screwed into the fixing portion 72c.

The fixed part 72c is a part that receives the threaded pipe fitting 71, and has a female threaded part 72f into which the male threaded part 71b of the threaded pipe fitting 71 is screwed. The male threaded portion 71b of the threaded pipe fitting 71 is screwed into the female threaded portion 72f of the fixing portion 72c, thereby fixing the threaded pipe fitting 71 and the conveying pipe 5 to the lid portion 72.

The inflow part 72b includes a collision part 72g with which the earth and sand B collide with each other. The collision portion 72g includes, for example, an inclined portion 72h that is inclined with respect to both the transport direction of the earth and sand B and the falling direction of the earth and sand B (for example, vertically downward). The earth and sand B that has flowed into the inflow portion 72b hits the inclined portion 72h of the collision portion 72g and changes its direction from the conveying direction to the falling direction, and then enters the bag member 75.

As an example, the inclined portion 72h may include a rubber plate against which the earth and sand B collides. In this case, the earth and sand B hits the rubber plate of the inclined portion 72h, so the impact of the earth and sand B on the lid part 72 is alleviated by the rubber plate. However, for example, if the particle size of the earth and sand B is small and the impact force on the slope part 72h is not large, even if the slope part 72h does not have a rubber plate, the fine earth and sand B will adhere to the slope part 72h. The earth and sand B functions as a cushion.

In the above, the earth and sand storage member 70 including the threaded pipe joint 71 has been described. However, the earth and sand storage member 70 may be connected to the discharge port 4f of the transport pipe 5 (third transport pipe 4) by means other than the threaded pipe joint 71 (for example, tape). The configuration of the earth and sand storage member is not limited to the example of the earth and sand storage member 70 described above, and can be changed as appropriate.

Next, the earth and sand conveying method according to this embodiment will be explained. First, as shown in FIG. , the second transport pipe 3, the ejector 12 (steel pipe 12f), and the third transport pipe 4 are connected to each other to install the earth and sand transport device 1 (installation step). At this time, the compressor 11 is connected to the ejector 12 via the conduit 13, and an auxiliary air device 40 is installed in the conduit 13 and the conveyance tube 5 (third conveyance tube 4).

After completing the installation of the earth and sand conveying device 1 as described above, the suction port of the first conveying pipe 2 is applied to the earth and sand B, and compressed air is sent from the compressor 11 to the steel pipe 12f of the ejector 12, thereby removing the ejector 12. put it into operation. When the ejector 12 operates, the earth and sand B is sucked into the transport pipe 5 from the suction port, and the earth and sand B is transported inside the transport pipe 5 (transporting step).

At this time, the auxiliary air device 40 may send air to a portion of the conveying pipe 5 on the upstream side of the rising portion 5b to suppress clogging of the earth and sand B in that portion. In this case, even if the upstream portion of the rising portion 5b is likely to be clogged with earth and sand B, the auxiliary air device 40 directly injects air onto the inner surface of the conveying pipe 5, thereby suppressing the clogging in the rising portion 5b. process of injecting air directly onto the inner surface).

For example, the earth and sand B that has passed through the third conveyance pipe 4 is stored in the earth and sand storage member 70 through the discharge port 4f. The earth and sand B is accumulated in the bag member 75 of the earth and sand storage member 70. After the inside of the bag member 75 is filled with the earth and sand B, suction of the earth and sand B is temporarily stopped. Then, the filled bag member 75 is replaced with another bag member 75, and the suction and conveyance of the earth and sand B are executed again.

As shown in FIGS. 1 and 3, for example, after a certain period of time (for example, 60 seconds to 300 seconds) has elapsed after the transport of the earth and sand B has started, the second transport pipe 3 is removed from the steel pipe 12f. Insert the auxiliary air device 20 (air injection tool 20A). Then, while moving the auxiliary air device 20 along the axial direction C and rotating the auxiliary air device 20 about the axis X, air R is injected onto the inner surface 12g of the steel pipe 12f to clean the inner surface 12g. In this way, air R is injected onto the inner surface 12g of the steel pipe 12f of the ejector 12 (step of injecting air directly onto the inner surface).

As described above, after the air R has been injected into the inner surface 12g of the steel pipe 12f, the second transport pipe 3 is connected to the steel pipe 12f again, and the earth and sand B is transported again as described above. As described above, the direct injection of the air R onto the inner surface 12g of the steel pipe 12f and the transport of the earth and sand B are repeated. Then, after all the earth and sand B has been suctioned and transported, the series of steps is completed.

Next, the effects of the earth and sand transport device 1 and the earth and sand transport method according to this embodiment will be described in detail. The earth and sand transport device 1 and earth and sand transport method according to the present embodiment include a transport pipe 5 for transporting earth and sand B, an ejector 12 having a steel pipe 12f, and a compressor 11, and the compressor 11 supplies compressed air to the steel pipe 12f of the ejector 12. By supplying the earth and sand, the steel pipe 12f of the ejector 12 sucks the earth and sand B, and the earth and sand B is conveyed to the conveying pipe 5. Therefore, by sending compressed air from the compressor 11 into the steel pipe 12f of the ejector 12, the earth and sand B can be sucked and transported.

In addition to the compressor 11 and the ejector 12, the earth and sand transport device 1 includes an auxiliary air device 20 (auxiliary air device 40) that injects air R directly onto the inner surface of at least one of the transport pipe 5 and the steel pipe 12f. Therefore, by providing the auxiliary air device 20 (auxiliary air device 40) that injects air R directly to the inner surface separately from the compressor 11 and the ejector 12, it is possible to remove the sediment B from the inner surface. It is possible to prevent clogging from occurring.

Further, since the auxiliary air device 20 (auxiliary air device 40) is provided separately from the ejector 12, there is no need to prepare a special ejector, and a ready-made ejector can be used as the ejector 12. Therefore, since the auxiliary air device 20 (auxiliary air device 40) directly injects the air R to the inner surface, it is possible to remove the adhesion to the inner surface and make it difficult for the inside of the conveying pipe 5 to be clogged with earth and sand B. Therefore, the transportability of the earth and sand B can be improved.

The auxiliary air device 20 may intermittently inject air R onto the inner surface 12g of the steel pipe 12f. In this case, since the air R is directly injected into the steel pipe 12f of the ejector 12, the boundary area between the steel pipe 12f of the ejector 12 and the conveyance pipe 5 (third conveyance pipe 4) is likely to be clogged with earth and sand B as the air R is injected. By allowing the air R to flow into the area, it is possible to effectively suppress the adhesion of earth and sand B to areas that are likely to become clogged. Moreover, by intermittently injecting air R to the inner surface 12g of the steel pipe 12f of the ejector 12, it becomes possible to separate the timing of transporting the earth and sand B and the injection of the air R.

The auxiliary air device 20 is an air injection device having a main body portion 21 extending in a tubular shape, and an air injection portion 22 having an air injection hole 22b opening in a direction intersecting the longitudinal direction L at one end of the main body portion 21 in the longitudinal direction L. The air injection device 20A may directly inject the air R from the air injection section 22 onto the inner surface 12g. In this case, an air injection tool 20A having an air injection hole 22b opening in a direction crossing the longitudinal direction L is inserted into the steel pipe 12f of the ejector 12 or the conveying pipe 5, and air is injected onto the inner surface of the steel pipe 12f or the conveying pipe 5. Air R is directly injected from the hole 22b. Therefore, since the air R can be directly injected to the inner surface with the air injection hole 22b brought close to the inner surface, it is possible to more reliably suppress the attachment of earth and sand B to the inner surface.

The air injection tool 20A is movable along the axial direction C of the steel pipe 12f of the ejector 12, and may directly inject the air R onto the inner surface 12g while moving in the axial direction C. In this case, since the air R can be directly injected onto the inner surface 12g of the steel pipe 12f while moving the air injection tool 20A along the axial direction C of the steel pipe 12f, the earth and sand B in the steel pipe 12f and the conveying pipe 5 connected to the steel pipe 12f The adhesion of can be more effectively suppressed.

The air injection tool 20A may directly inject the air R onto the inner surface 12g while moving in the axial direction C and rotating around the axis X of the steel pipe 12f. In this case, by directly injecting the air R onto the inner surface 12g of the steel pipe 12f while rotating the air injection tool 20A, the air R can be evenly injected onto the inner surface 12g of the steel pipe 12f. Furthermore, by injecting the air R while rotating, even when using the air injection tool 20A having a simple configuration such as an elbow pipe, the air R can be evenly injected by rotation.

As described above, the earth and sand conveying device 1 may include the pressure measurement section 26 and the control section 27 that controls the auxiliary air device 20 according to the pressure measurement result by the pressure measurement section 26. In this case, since the control unit 27 controls the auxiliary air device 20 according to the pressure inside the conveying pipe 5, the air R can be injected according to the pressure. Therefore, by controlling the injection of air R according to the measured pressure by the control unit 27, air injection to the inner surface 12g can be efficiently and automatically performed.

The earth and sand conveying device 1 may include a timing setting means 28 that can set the timing at which the ejector 12 conveys the earth and sand B and the timing at which the auxiliary air device 20 directly injects the air R onto the inner surface 12g. In this case, the timing setting means 28 can set the timing of transporting the earth and sand B and the timing of jetting the air R to the inner surface 12g. Therefore, it is possible to transport the earth and sand B and inject the air R to the inner surface 12g in a preset cycle, so that the earth and sand B can be transported efficiently while removing the earth and sand B from adhering to the inner surface 12g. be able to. The above effects can be obtained not only from the auxiliary air device 20 but also from the auxiliary air device 30, the auxiliary air device 40, the auxiliary air device 50, and the auxiliary air device 80.

While the ejector 12 transports the earth and sand B, for example, the auxiliary air device 40, the auxiliary air device 50, or the auxiliary air device 80 may directly inject air R onto the inner surface. In this case, it becomes possible to transport the earth and sand B by suction by the ejector 12 and to inject air to the inner surface by the auxiliary air devices 40, 50, and 80. Therefore, since the soil B can be transported while removing the soil B from adhering to the inner surface by injecting air to the inner surface, the soil B can be transported more efficiently.

The conveyance pipe 5 includes a rising part 5b extending upward, and the auxiliary air devices 40, 80 inject air R to the upstream part of the rising part 5b in the transport path of the earth and sand B of the transport pipe 5. It's okay. When the conveyance pipe 5 includes a rising portion 5b extending upward, the upstream portion of the rising portion 5b may be easily clogged with earth and sand B. However, when air is injected into the upstream portion of the rising portion 5b as in the present embodiment, air can be directly injected into the upstream portion where clogging is likely to occur. Therefore, since air can be directly injected into the areas where the earth and sand B tend to become clogged, the transportability of the earth and sand B can be further improved.

(Example)
Next, an embodiment of the earth and sand conveying device 1 will be described. Note that the present invention is not limited to the description of the following examples. As shown in FIG. 4(b), in the earth and sand transport device 1 according to the embodiment, after transporting the earth and sand B for 90 seconds, the auxiliary air device 20 directly injects air R onto the inner surface 12g of the steel pipe 12f. Ten cycles (20 minutes) of 30 second cycles were performed. On the other hand, in the earth and sand transport device according to the comparative example, only earth and sand B was transported for 20 minutes. The results of the experiment are shown in FIGS. 13(a) and 13(b).

As shown in FIG. 13(a), in the earth and sand conveying device of the comparative example, clogging of earth and sand B occurs inside the steel pipe 12f, and the amount of earth and sand B conveyed per hour is 0.3 m ³ /h. there were. In contrast, in the earth and sand conveying device 1 of the example, as shown in FIG. 13(b), no clogging of earth and sand B occurred inside the steel pipe 12f even after 20 minutes, and The conveyance amount of B was 0.9 m ³ /h. As described above, it was found that the earth and sand conveying device 1 according to the example can suppress clogging of the earth and sand B inside the steel pipe 12f, and can increase the amount of earth and sand B conveyed by about three times that of the comparative example.

The embodiments and examples of the earth and sand transport device and earth and sand transport method according to the present disclosure have been described above. However, the present disclosure is not limited to the embodiments or examples described above, and may be modified or applied to other things without changing the gist of each claim. That is, the shape, size, number, material, and arrangement of each part of the earth and sand transport device, as well as the content and order of each step of the earth and sand transport method, can be changed as appropriate without changing the above gist.

For example, in the embodiments described above, an example was described in which the L-shaped auxiliary air device 20 includes the tubular main body portion 21 and the air injection portion 22. However, aspects of the auxiliary air device are not limited to the auxiliary air device 20. For example, as shown in FIGS. 14(a) and 14(b), an air supply unit 91 such as a compressor, a hose 92 that passes air from the air supply unit 91, and an injection unit that injects air R passing through the hose 92. An auxiliary air device 90 having a portion 93 may be provided.

The width (outer diameter) of the hose 92 is smaller than the inner diameter of the steel pipe 12f and the inner diameter of the conveying pipe 5. The hose 92 extends from the air supply section 91 and is made of, for example, a flexible material that can be easily deformed. An air supply section 91 is connected to one end of the hose 92, and an injection section 93 is connected to the other end of the hose 92. The injection part 93 has, for example, a spherical shape having an outer diameter smaller than the inner diameter of the steel pipe 12f and the inner diameter of the conveying pipe 5.

The injection part 93 has an expanded part 93b that expands from the hose 92, and a recessed part 93c that is depressed from the expanded part 93b and is formed so that a plurality of air injection holes 93d are lined up along a predetermined direction. The recess 93c extends, for example, along the circumferential direction of the conveyance pipe 5 (steel pipe 12f), and a plurality of air injection holes 93d arranged along the circumferential direction are formed on the bottom surface of the recess 93c.

The injection part 93 and hose 92 of the above-mentioned auxiliary air device 90 are inserted into the steel pipe 12f and the conveyor pipe 5 in the same manner as the auxiliary air device 20 described above, and the air R is radially released from the air injection hole 93d of the injection part 93. By injecting the air R, the air R can be efficiently and directly injected onto the inner surface 5c of the conveying pipe 5 and the inner surface 12g of the steel pipe 12f. By pulling the hose 92 toward the steel pipe 12f while injecting the air R in this way, it becomes possible to inject the air R while moving the injection part 93 in the axial direction C. Therefore, it is possible to efficiently inject the air R to the inner surface 5c and the inner surface 12g.

Moreover, in the above-mentioned embodiment, the transport pipe 5 including the first transport pipe 2, the second transport pipe 3, and the third transport pipe 4 was exemplified. However, the configuration of the conveyance pipe is not limited to the above example, and can be changed as appropriate. Furthermore, in the embodiment described above, the earth and sand storage member 70 including the screw-in pipe joint 71, the lid portion 72, the container 73, and the bag member 75 was exemplified. However, the configuration of the earth and sand storage member is not limited to the above example and can be changed as appropriate.

Moreover, the earth and sand transport device does not need to have an earth and sand storage member. For example, in the embodiment described above, the earth and sand conveying device 1 and the earth and sand conveying method for earth and sand B used at a construction site A have been described. However, the earth and sand transport device and the earth and sand transport method according to the present disclosure may be used at places other than construction sites.

DESCRIPTION OF SYMBOLS 1... Earth and sand transport device, 2... First transport pipe, 2b... Suction port, 3... Second transport pipe, 4... Third transport pipe, 4f... Discharge port, 5... Transport pipe, 5b... Standing part, 5c...inner surface, 6...transport pipe, 6b...general part, 6c...diameter enlarged part, 10...transport means, 11...compressor, 12...ejector, 12b...introduction pipe, 12c...branch pipe, 12d...merging pipe, 12f... Steel pipe, 12g...Inner surface, 13...Pipe line, 20, 30, 40, 50, 80, 90...Auxiliary air device, 20A, 30A, 50A...Air injection tool, 21, 31...Main body, 22, 32...Air injection Parts, 22b, 32b... Air injection hole, 26... Pressure measurement part, 27... Control part, 28... Timing setting means, 32c... Connection part, 32d... Tip part, 41... Switching part, 42... Air supply path, 43... Branch pipe, 44... Switching cock, 45... Connection part, 45b... Opening part, 45c... First part, 45d... Second part, 45f... Hose clamp, 51... First injection port, 52... Second injection port , 60... hopper, 61... earth and sand input section, 62... earth and sand inflow section, 62b... insertion hole, 63... shutter gate, 64... vibrator, 70... earth and sand storage member, 71... threaded pipe joint, 71b... male screw section, 72 ... Lid part, 72b... Inflow part, 72c... Fixing part, 72d... Sealing part, 72f... Female screw part, 72g... Collision part, 72h... Inclined part, 73... Container, 75... Bag member, 81... Air scoop, 82... Receiving part, 82b... Mounting part, 82c... Hose, 82d... Valve part, 82f... Gripping part, 83... Injection nozzle, 83b... Tip part, 84... Handle, 84b... First tubular part, 84c... First 2 tubular part, 84d... third tubular part, 85... supply pipe part, 86... first attachment part, 86b... elastic member, 86c... clamp, 86d... string-like member, 86f... insertion hole, 86g... annular part , 86h... Curved part, 86j... Annular part, 87... Second attachment part, 88... Third attachment part, 91... Air supply part, 92... Hose, 93... Injection part, 93b... Expansion part, 93c... Concave part, 93d ...Air injection hole, A...Construction site, A1...Ground, B...Earth, C...Axial direction, D...Conveyance direction, D1...Longitudinal direction, D2...Cross direction, G...Ground, K...Compressed air, L...Longitudinal Direction, M...worker, R...air, X...axis.

Claims (10)

An earth and sand transport device that transports earth and sand,
an ejector that has a steel pipe connected to a conveyance pipe that conveys earth and sand, and that sucks earth and sand into the steel pipe and conveys the earth and sand to the conveyance pipe;
a compressor that sends compressed air for conveying earth and sand to the steel pipe of the ejector;
an auxiliary air device that directly injects air into the inner surface of at least one of the conveying pipe and the steel pipe;
Equipped with
The auxiliary air device has a main body having a rod shape, and the length of the main body is equal to or longer than the length of the ejector.
Earth and sand transport equipment. The auxiliary air device intermittently injects air onto the inner surface of the steel pipe.
The earth and sand transport device according to claim 1. The auxiliary air device is an air injection device having a main body portion extending in a tubular shape, and an air injection portion having an air injection hole opening in a direction intersecting the longitudinal direction at one longitudinal end of the main body portion,
The air injection tool directly injects air from the air injection part onto the inner surface of the steel pipe .
The earth and sand transport device according to claim 1 or 2. The air injection device is movable along the axial direction of the steel pipe in the steel pipe of the ejector, and injects air directly onto the inner surface of the steel pipe while moving in the axial direction.
The earth and sand transport device according to claim 3. The air injection device moves in the axial direction and rotates around the axis of the steel pipe to inject air directly onto the inner surface of the steel pipe .
The earth and sand transport device according to claim 4. a pressure measuring unit that measures the pressure inside the conveying pipe;
a control unit that controls the auxiliary air device according to the pressure measurement result by the pressure measurement unit;
Equipped with
The earth and sand transport device according to any one of claims 1 to 5. comprising timing setting means capable of setting the timing at which the ejector conveys the earth and sand and the timing at which the auxiliary air device injects air directly onto the inner surface of the steel pipe ;
The earth and sand transport device according to any one of claims 1 to 6. The ejector transports the earth and sand, and the auxiliary air device injects air directly onto the inner surface of the steel pipe .
The earth and sand transport device according to any one of claims 1 to 7. The conveying pipe includes a rising portion extending upward,
The auxiliary air device injects air to a portion upstream of the rising portion in the earth and sand transport path of the transport pipe.
The earth and sand transport device according to any one of claims 1 to 8. An earth and sand transport method that transports earth and sand using a transport pipe that transports earth and sand, and an ejector having a steel pipe connected to the transport pipe, the method comprising:
feeding compressed air into the steel pipe to transport earth and sand to the transport pipe;
a step in which an auxiliary air device directly injects air onto the inner surface of at least one of the conveying pipe and the steel pipe;
Equipped with
The auxiliary air device has a main body having a rod shape, and the length of the main body is equal to or longer than the length of the ejector.
Sediment transport method.

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