JP2022038370A - Sediment pumping device and sediment pumping method - Google Patents

Abstract

To provide a sediment pumping device and a sediment pumping method capable of efficiently pumping sediment even when the viscosity of the sediment is high.SOLUTION: A sediment pumping device according to one embodiment includes a pipe 2 and a hopper 11 having an internal space 11b and in which the sediment S is put into the internal space 11b, a cylinder 12 that can move in the internal space 11b while penetrating a wall portion 11c of the hopper 11, a piston 13 that pushes out the sediment S that has entered the cylinder 12, an upper screw 14 which is arranged above the cylinder 12 in the internal space 11b and conveys the sediment S thrown into the internal space 11b, a lower screw 15 which is arranged below the upper screw 14 in the internal space 11b and conveys the sediment S thrown into the internal space 11b, and a sediment discharge port 16 formed on the wall portion 11c of the hopper 11 and discharging the sediment S conveyed by the lower screw 15 from the internal space 11b.SELECTED DRAWING: Figure 5

Description

The present disclosure relates to a sediment pumping device and a sediment pumping method for pumping sediment.

Various types of earth and sand pumping devices and earth and sand pumping methods for pumping earth and sand have been conventionally known. Japanese Patent Publication No. 6-10400 describes a soil removal device for a shield excavator. The soil removal device is used when constructing a tunnel underground. The earth removal device uses a primary screw conveyor that conveys excavated earth and sand excavated in the cutter room, a secondary screw conveyor that further conveys excavated earth and sand conveyed by the primary screw conveyor, and excavated earth and sand conveyed to the secondary screw conveyor. Equipped with a closed tank for storing.

The closed tank is connected to the secondary screw conveyor via a flexible joint. The inside of the closed tank is divided into an upper chamber and a lower chamber via a gravel separating means, and earth and sand are transported to the upper chamber. In the upper chamber, an agitator that agitates the earth and sand transported into the upper chamber is arranged. Of the earth and sand agitated by the agitator, the gravel with a large particle size does not pass through the gravel separating means, but the earth and sand with a small particle size passes through the gravel separating means and enters the lower chamber.

In the lower chamber, a pressure feeding pump for pumping earth and sand and a pressure feeding pipe through which the earth and sand pumped to the pressure feeding pump pass are arranged. The pressure feed pump is connected to a cylinder that slides with respect to a guide cylinder provided so as to penetrate the side surface of the lower chamber so that it can freely appear and disappear in the lower chamber, a piston provided inside the cylinder, and a pressure feed pipe. It is equipped with a bent switching valve tube.

When the cylinder appears and disappears in the lower chamber, earth and sand enter the inside of the cylinder. Then, the cylinder containing the earth and sand is pulled out and the switching valve pipe is connected to the guide pipe, and in this state, the piston pushes the earth and sand inside the cylinder and pushes the earth and sand into the pressure feed pipe via the guide pipe and the switching valve pipe. As a result, earth and sand are pumped in the pumping pipe.

Special Fair 6-10400 Gazette

The above-mentioned earth removal device has a problem that when the cylinder enters the lower chamber, the earth and sand do not sufficiently enter the inside of the cylinder, and the earth and sand cannot be efficiently pumped. Specifically, when the cylinder is pushed into the earth and sand in the lower chamber, the earth and sand may get caught between the cylinder and the inner wall of the lower chamber, and the earth and sand do not sufficiently enter the inside of the cylinder. There is room for improvement in this respect.

In particular, earth and sand located below the groundwater level may have a high water content, but may not have high fluidity enough to be pumped. Therefore, even if the cylinder is inserted, the earth and sand having low fluidity cannot be sufficiently taken into the inside of the cylinder, and the high frictional force between the cylinder and the earth and sand may cause an excessive pressure load for inserting the cylinder. .. As a result, the pumping amount per unit time is reduced, and there is a concern that the inside of the pipe for pumping earth and sand may be blocked.

It is an object of the present disclosure to provide a sediment pumping device and a sediment pumping method capable of efficiently pumping sediment even when the viscosity of the sediment is high.

The earth and sand pumping device according to the present disclosure is an earth and sand pumping device for pumping earth and sand, and has a pipe through which earth and sand pass and an internal space communicating with the pipe. A cylinder that can move in the internal space while penetrating the part, a piston that pushes the earth and sand that has entered the cylinder into the pipe, and a piston that is placed above the cylinder in the internal space to convey the earth and sand that has been thrown into the internal space. It is placed below the screw and the upper screw in the internal space, and is formed on the wall of the hopper and the lower screw that conveys the earth and sand thrown into the internal space. It is equipped with a sediment discharge port for discharging from.

In this earth and sand pumping device, earth and sand are thrown into the internal space of the hopper, and the put in earth and sand are agitated. In the internal space of the hopper, a cylinder that moves in the internal space of the hopper while penetrating the wall of the hopper, an upper screw arranged above the cylinder, and a lower screw arranged below the upper screw are provided. Be prepared. Therefore, since the earth and sand can be sufficiently agitated by both the upper screw and the lower screw provided in the upper and lower pairs, the earth and sand can be efficiently pumped. In addition to the pipe from which the earth and sand are pushed out, this earth and sand pumping device is provided with an earth and sand discharge port for discharging the earth and sand conveyed by the lower screw from the internal space of the hopper. Therefore, even if earth and sand having a high water content and not high fluidity are thrown into the internal space of the hopper, the earth and sand can be agitated by the lower screw and the earth and sand conveyed by the lower screw can be discharged from the earth and sand discharge port. .. Therefore, even if the earth and sand having low fluidity are thrown in, the earth and sand are discharged from the earth and sand discharge port, so that the earth and sand can be efficiently taken into the inside of the cylinder. Since the pressure load for inserting the cylinder can be reduced, the amount of earth and sand pumped per unit time can be increased, and the internal blockage of the pipe can be suppressed. Therefore, even when the viscosity of the earth and sand is high, the earth and sand can be efficiently pumped.

The earth and sand pumping device described above is connected to a pipe, and may be provided with a slurry injection device that injects slurry into the inside of the pipe (in the middle of the pipe). In this case, the slurry injection device injects the slurry in the middle of the pipe through which the earth and sand pass. Therefore, by injecting the slurry in the middle of the pipe, it is possible to reduce the pressure loss on the inner surface of the pipe when the earth and sand are pumped. Therefore, it is possible to efficiently pump the earth and sand inside the pipe.

The earth and sand pumping device described above may include a guide portion for guiding the movement of the cylinder between the bottom of the hopper and the cylinder. In this case, since the guide portion guides the movement of the cylinder with respect to the wall portion of the hopper, the movement of the cylinder can be stabilized. Therefore, by stabilizing the movement of the cylinder, it is possible to efficiently take in the earth and sand inside the cylinder. As a result, it is possible to efficiently pump the earth and sand from the cylinder to the pipe.

The bottom of the hopper may include a protrusion protruding downward from the guide portion, and a lower screw and a sediment discharge port may be provided inside the protrusion. In this case, a protrusion protruding downward is provided at the bottom of the hopper, and a lower screw and a sediment discharge port are provided inside the protrusion. Therefore, the earth and sand having low fluidity are accumulated in the protruding portion protruding downward, and then the lower screw is conveyed, and the earth and sand accumulated inside the protruding portion is discharged from the earth and sand discharge port. Therefore, since the earth and sand having low fluidity can be concentrated and discharged from the earth and sand discharge port, the earth and sand put into the internal space of the hopper can be efficiently pumped.

The earth and sand pumping device described above may include a plurality of cylinders, and a lower screw may be provided between the plurality of cylinders. In this case, it is possible to efficiently pump the earth and sand from the internal space of the hopper by using a plurality of cylinders. Further, since the lower screw is provided between the plurality of cylinders, each of the plurality of cylinders can take in the earth and sand agitated by the lower screw. Therefore, by taking in the agitated earth and sand by each cylinder, it is possible to more efficiently pump the earth and sand from the internal space of the hopper.

The upper screw has a rotary shaft and a transport blade that transports the earth and sand while stirring by the rotation of the rotary shaft, and the transport blade extends diagonally from the rotary shaft in a direction intersecting the extending direction of the rotary shaft. The blade portion includes a second blade portion that intersects the rotation axis in the extending direction and extends diagonally in a direction different from that of the first blade portion, and includes a first blade portion and a second blade portion. May transport earth and sand so as to be closer to the center of the axis of rotation. In this case, since the earth and sand are conveyed to the center of the rotating shaft by the first blade portion and the second blade portion of the upper screw, the earth and sand can be moved toward the center side of the rotating shaft while stirring. Therefore, it is possible to suppress the bias of earth and sand in the internal space of the hopper.

The end face of the cylinder on the pipe side may be inclined with respect to a plane orthogonal to the axis of the cylinder. In this case, the area of the end face of the cylinder can be increased as compared with the case where the end face of the cylinder is parallel to the plane orthogonal to the axis of the cylinder. Therefore, since a large amount of earth and sand can be taken in by the cylinder, a large amount of earth and sand can be efficiently pumped.

The earth and sand pumping method according to the present disclosure is an earth and sand pumping method for pumping earth and sand using the above-mentioned earth and sand pumping device, in which a step of moistening the inner surface of a pipe and a slurry flowing through a pipe whose inner surface is moistened. It is equipped with a process. In this earth and sand pumping method, water or the like is flowed through the pipe before the slurry is flowed through the pipe to moisten the inner surface of the pipe. Therefore, it is possible to more reliably suppress the blockage of the pipe due to the clogging of earth and sand.

The earth and sand pumping method described above may include a step of putting a modifier into the earth and sand that has passed through a pipe. In this case, the modifier is added to the earth and sand after passing the earth and sand through the pipe through which the slurry has flowed. Therefore, by modifying the earth and sand, it is possible to suppress the industrial waste of the earth and sand.

In the step of flowing the slurry, the slurry obtained by mixing the dispersant may be flowed to the pipe. In this case, since the dispersant can be mixed to obtain a slurry, the slurry can be easily produced even in the field.

According to the present disclosure, even when the viscosity of the earth and sand is high, the earth and sand can be efficiently pumped.

It is sectional drawing which shows the exemplary site to which the earth and sand pumping apparatus and earth and sand pumping method which concerns on embodiment are applied. It is a graph which shows the example of the relationship between the liquid index and the cone index in earth and sand. It is a graph which shows the example of the relationship between the water content ratio and the flow value in earth and sand. It is a graph which shows the example of the relationship between the water content ratio in earth and sand, and the table flow. FIG. 3 is a cross-sectional view showing a hopper, an upper screw, a cylinder, a lower screw, a pipe, and an earth and sand discharge port of the earth and sand pumping device of FIG. FIG. 5 is a cross-sectional view taken along the line AA of FIG. It is sectional drawing which shows the hopper, the upper screw, the cylinder, the lower screw, the pipe, and the earth and sand discharge port of the earth and sand pumping apparatus which concerns on a modification. It is a side view which shows the upper screw which concerns on the modification. It is sectional drawing which shows the cylinder which concerns on the modification. It is sectional drawing which shows the hopper, the upper screw, the cylinder and the lower screw which concerns on a modification. It is sectional drawing which shows the hopper, the upper screw, the cylinder and the lower screw which concerns on a further modification. It is a side view which shows typically the slurry injection apparatus of the earth and sand pumping apparatus of FIG. It is a cross-sectional view of the slurry injection device of FIG. It is a cross-sectional view of the slurry injection device which concerns on a modification. It is sectional drawing which shows the state of earth and sand and the injected slurry in the slurry injection apparatus of FIG. It is a side view which shows the slurry injection apparatus which concerns on a further modification. It is sectional drawing which shows the slurry injection apparatus which concerns on a further modification.

Hereinafter, embodiments of the earth and sand pumping device and the earth and sand pumping 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 designated by the same reference numerals, and duplicate description will be omitted as appropriate. In addition, the drawings may be partially simplified or exaggerated for the sake of easy understanding, and the dimensional ratios and the like are not limited to those described in the drawings.

FIG. 1 is a cross-sectional view showing an exemplary site A to which the sediment pumping device 1 and the sediment pumping method according to the present embodiment are applied. At the site A, for example, the earth and sand S, which is the excavated soil obtained by excavation, is passed through the inside of the pipe 2 and the earth and sand S is pumped. The pipe 2 is, for example, a steel pipe, but may be made of a material other than metal. The cross-sectional shape of the pipe 2 is, for example, an annular shape, but may have another shape such as a quadrangular shape.

In the present embodiment, the pipe 2 is provided underground and above ground T constituting the site A, which is a construction site. For example, the length of the pipe 2 is 10 m to a dozen km. The entrance of the pipe 2 is located in the basement of the site A, and the exit of the pipe 2 is located in the ground of the site A. A dump truck D, which is a sediment-carrying vehicle, is installed in the construction yard A1 on the ground T of the site A. The earth and sand S discharged from the outlet of the pipe 2 is loaded on the dump truck D, and the dump truck D transfers the loaded earth and sand S.

In the cross section extending in the vertical direction, the pipe 2 is, for example, L-shaped. Since the pipe 2 is L-shaped, for example, even in a narrow urban civil engineering site A, a place where the earth and sand S is discharged from the construction yard A1 avoiding the road does not interfere with general traffic. It is possible to pump the earth and sand S to.

As a result, the pumping of earth and sand S can be carried out not only at night but also in the daytime, which contributes to shortening the construction period. Further, by discharging the earth and sand S to the construction yard A1 avoiding the road, even if the distance of the pipe 2 is long, the earth and sand pumping device 1 can efficiently pump the earth and sand S.

For example, the earth and sand S at the site A is soil having a liquidity index and a sensitivity ratio of a certain value or more. The liquidity index is obtained from, for example, the natural water content ratio, the liquidity limit and the plasticity index. The liquid limit indicates the water content ratio that is the boundary value when the soil transitions from a plastic body to a liquid body, and the plasticity index indicates the range of the water content ratio at which the soil exhibits a plastic state. The liquidity index of the earth and sand S is, for example, 0.5 or more, but may be 0.7 or more, 0.8 or more, or 1.0 or more. The sensitivity ratio of the earth and sand S is, for example, 2.0 or more, but may be 3.0 or more, 4.0 or more, 8.0 or more, 10.0 or more, or 17.0 or more.

At the underground site A, for example, the ground G is excavated to construct a building structure, and the earth and sand S generated by the excavation is pumped from the underground to the above-ground T through the pipe 2. The ground G at the site A may be, for example, a soft ground, and if a heavy machine is arranged on the soft ground and the heavy machine is operated, the stability of the heavy machine may become a problem. When the ground G is soft ground, it may not be possible to secure the stability of the heavy machinery that moves around, and in this case, there is a concern that the safety of work such as excavation may be reduced. In addition, in order to ensure the stability of heavy machinery, it is conceivable to install an iron plate or the like. However, when installing an iron plate or the like, it takes time and effort to install it, which may put pressure on the construction process. Therefore, especially when the ground G is a soft ground, it is required to perform the work without moving heavy machinery or the like as much as possible.

The earth and sand pumping device 1 according to the present embodiment includes a pumping facility 10 located on the upstream side of the pipe 2 in the pumping path of the sediment S, and a slurry injection device 50 located on the downstream side of the pumping facility 10 in the pipe 2. .. The pumping equipment 10 pumps the earth and sand S into the inside of the pipe 2, and the slurry injection device 50 supplies the slurry R (see FIG. 13 and the like) to the inside of the pipe 2, so that the earth and sand S can be efficiently pumped. be. Therefore, the load on the heavy machine can be reduced, the stability of the heavy machine can be improved, and the pressure on the process can be avoided.

FIG. 2 is a graph showing an example of the relationship between the liquidity index of earth and sand S and the cone index. As shown in FIG. 2, the larger the liquidity index of the sediment S, the smaller the cone index of the sediment S. The "cone index" is the average value of the fitting resistance that acts on the bottom of the cone when the earth and sand S is continuously pushed into the bottom of the cone of the cone penetrometer at a speed of 1 cm / s at 5 cm, 7.5 cm, and 10 cm. , The value divided by the area of the bottom surface of the cone is shown. This test method may be referred to as a cone test. The smaller the cone index value, the softer the sediment S, and the larger the cone index value, the harder the sediment S.

For example, soil with a liquid index of 0.8 (or 0.75) or more is cohesive soil, soil with a liquid index of 0.2 (or 0.25) or less is sandy soil, and soil with a liquid index of 0. .Soil with a value of 2 or more and 0.8 or less may be referred to as intermediate soil (soil in which clay and sand are mixed). The earth and sand S may be, for example, a cohesive soil or an intermediate soil having a liquidity index of 0.5 or more, and the cone index of the earth and sand S is 500 or less, 300 or less, or 200 or less.

FIG. 3 is a graph showing an example of the relationship between the water content ratio of earth and sand S and the flow value. The flow value is a value indicating an index of fluidity by the "density / consistency test method of fresh air bubble mixed lightweight soil" of "Vol. 1 Soil-related test method" of the NEXCO test method. In this test method, a cylindrical cylinder having an inner diameter (80 ± 0.5) mm and a capacity (400 ± 7) cm ³ is filled with earth and sand S, and the earth and sand S spread when the cylinder is pulled up in the vertical direction. The flow value is obtained from the diameter, and the flow value indicates the consistency characteristic of the earth and sand S.

Specifically, the flow value is obtained by the following method. First, the glass plate is placed on a horizontal plane, and the above cylinder is placed on the glass plate. Then, the cylinder is filled with the earth and sand S without a gap, and at this time, the upper surface of the earth and sand S is slightly above the upper surface of the cylinder, and then the upper surface of the earth and sand S is removed with a straight knife to finish the upper surface of the earth and sand S flat. .. After that, the cylinder is pulled up in the direction perpendicular to the glass plate and the earth and sand S is left for 1 minute. Let the value be the flow value.

As shown in FIG. 3, the larger the water content ratio of the earth and sand S, the larger the flow value of the earth and sand S. For example, the flow value of the earth and sand S is 75 mm or more, 80 mm or more or 90 mm or more, and the water content ratio of the earth and sand S is 30% or more, 40% or more or 50% or more. If the flow value of the earth and sand S is 100 mm or more, the earth and sand S is significantly deformed and the fluidity is enhanced. If the flow value is 75 mm or more, the sediment S can be sufficiently pumped by the sediment pumping device 1 (the sediment pumping device 1 may be able to pump).

FIG. 4 is a graph showing an example of the relationship between the water content ratio of earth and sand S and the table flow. The table flow is a value indicating an index of fluidity obtained by the table flow test described in "12 Flow Test 12.2 Flow Value Characteristics" of JIS R 5201: 2015 (Physical test method for cement). ..

In the table flow test, the earth and sand S is packed in two layers in the flow cone arranged on the flow table, the earth and sand S is pierced 15 times with a stick, the surface of the earth and sand S is leveled, and then the flow cone is removed in the vertical direction. Then, the earth and sand S is subjected to 15 falling motions in 15 seconds to measure the maximum diameter after the earth and sand S spreads and the diameter in the direction perpendicular to the maximum diameter, and the average value thereof becomes the value of the table flow.

As shown in FIG. 4, the larger the water content ratio of the earth and sand S, the larger the table flow value of the earth and sand S. The value of the table flow of the earth and sand S is, for example, 105 mm or more, 115 mm or more, or 120 mm or more. If the value of the table flow is 105 mm, the sediment S can be sufficiently pumped by the sediment pumping device 1 (the sediment pumping device 1 may be able to pump).

Subsequently, an example of the configuration of the earth and sand pumping device 1 will be described. FIG. 5 shows a cross section of an exemplary pumping facility 10 of the sediment pumping device 1 as viewed from the side. As shown in FIG. 5, the pumping equipment 10 has an internal space 11b communicating with the pipe 2, and also penetrates the bottomed hopper 11 into which the earth and sand S is charged and the wall portion 11c of the hopper 11 and has an internal space. A cylinder 12 that can be taken in and out of the cylinder 12 and a piston 13 that pushes out the earth and sand S that has entered the cylinder 12 are provided. Further, the pumping equipment 10 discharges the upper screw 14 located above the cylinder 12 in the internal space 11b, the lower screw 15 located below the upper screw 14, and the earth and sand S conveyed by the lower screw 15. It is provided with a discharge port 16.

FIG. 6 is a cross-sectional view taken along the line AA of FIG. As shown in FIGS. 5 and 6, the pumping equipment 10 may further include a vibrator 17 fixed to the outer surface 11d of the hopper 11. The hopper 11 has, for example, a wall portion 11c directed in the horizontal direction and a bottom portion 11h directed vertically downward. Instead of the vibrator 17, a knocker or an air blower may be used to prevent the earth and sand S from adhering to the hopper 11.

A screen 11k is provided at the upper end of the internal space 11b of the hopper 11. Of the earth and sand S, for example, the earth and sand S having a particle size of a certain value or less passes through the screen 11k and enters the internal space 11b, but the earth and sand S having a particle size exceeding the certain value is removed without passing through the screen 11k. To. With this screen 11k, it is possible to suppress the entry of earth and sand S having a large particle size into the internal space 11b of the hopper 11.

The wall portion 11c faces the side of the hopper 11, and for example, a through hole 11j through which the cylinder 12 is passed is formed in the wall portion 11c located on one side of the internal space 11b. The wall portion 11c located on the other side of the internal space 11b is provided with a connection portion 18 to which the pipe 2 is connected, a sediment discharge port 16, and an on-off valve 19 for opening and closing the sediment discharge port 16.

The cylinder 12 is movable with respect to the wall portion 11c of the hopper 11 along the axial direction D1 of the cylinder 12, and when entering the hopper 11, earth and sand S enters the inside of the cylinder 12. The cylinder 12 moves, for example, to a connecting portion 18 that connects the pipe 2 and the hopper 11 to each other.

The connection portion 18 includes an opening 18b into which the cylinder 12 enters and an on-off valve 18c for opening and closing the opening 18b. The cylinder 12 in which the earth and sand S has entered is passed through, for example, the opening 18b, and in this state, the piston 13 pushes out the earth and sand S inside the cylinder 12, so that the earth and sand S is pumped to the pipe 2.

The pumping equipment 10 includes, for example, two cylinders 12. In this case, two pipes 2 connected to the hopper 11 and two connecting portions 18 are provided. That is, the pipe 2 and the connecting portion 18 connected to the hopper 11 are provided so as to correspond to the cylinder 12. The two cylinders 12 are arranged so as to be arranged along the crossing direction D2 intersecting the axial direction D1, for example. As an example, the crossing direction D2 is the horizontal direction. By providing a plurality of cylinders 12 arranged along the crossing direction D2 in this way, it is possible to efficiently pump the earth and sand S.

The upper screw 14 extends, for example, above the cylinder 12 in the axial direction D1 of the cylinder 12. The upper screw 14 includes a rotating shaft 14b and a plurality of transport blades 14c extending diagonally from the rotating shaft 14b in a direction intersecting the extending direction (axis direction D1) of the rotating shaft 14b. For example, one end and the other end of the rotating shaft 14b face (for example, close to or in contact with) the wall portion 11c of the hopper 11.

For example, in the upper screw 14, a plurality of transport blades 14c transport the earth and sand S by rotating the rotating shaft 14b by a motor. Specifically, in the upper screw 14, when the rotary shaft 14b is rotated in one direction, a plurality of transport blades 14c transport the earth and sand S to the pipe 2 side, and the rotary shaft 14b is rotated in the opposite direction in the one direction. A plurality of transport blades 14c transport the earth and sand S to the opposite side of the pipe 2. The plurality of transport blades 14c are formed so as to be evenly spaced along the axial direction D1, for example.

The lower screw 15 is provided below the cylinder 12 and the upper screw 14. The lower screw 15 extends along the axial direction D1 at the bottom portion 11h of the hopper 11, for example. Like the upper screw 14, the lower screw 15 includes a rotating shaft 15b and a plurality of transport blades 15c, and one end and the other end of the rotating shaft 15b face the wall portion 11c of the hopper 11. When one end of the rotating shaft 15b is close to the sediment discharge port 16, the sediment S at the bottom 11h can be discharged from the sediment discharge port 16 more efficiently.

Similar to the upper screw 14, the lower screw 15 has a plurality of transport blades 15c that transport the earth and sand S by rotating the rotating shaft 15b by a motor. In the lower screw 15, a plurality of transport blades 15c transport the earth and sand S to the earth and sand discharge port 16 side by rotating the rotation shaft 15b in one direction. Then, the earth and sand S reaching one end of the lower screw 15 is discharged to the outside of the hopper 11 from the earth and sand discharge port 16. As an example, the pitch (arrangement interval) of the transport blades 15c of the lower screw 15 is wider than the pitch of the transport blades 14c of the upper screw 14. However, the relationship between the pitch of the transport blades 15c and the pitch of the transport blades 14c is not particularly limited.

Although the pumping equipment 10 has been described above, the configuration of the pumping equipment is not limited to the configuration of the pumping equipment 10 described above. Hereinafter, the pumping equipment according to the modified example will be described. Since the partial configuration of the pumping equipment according to the modified example is the same as the partial configuration of the pumping equipment 10 described above, the description overlapping with the description of the pumping equipment 10 described above will be omitted as appropriate.

FIG. 7 is a cross-sectional view showing a pumping facility 10A provided with a hopper 11A according to a modified example. As shown in FIG. 7, the hopper 11A has a wall portion 11m having a shape different from that of the wall portion 11c. The wall portion 11m has an inclined surface 11p that is inclined so that the internal space 11b expands upward toward the upper side of the connecting portion 18.

Since the hopper 11A has the inclined surface 11p above the pipe 2, for example, the length of the upper screw 14 in the axial direction D1 is longer than the length of the lower screw 15 in the axial direction D1. In this way, by having the inclined surface 11p that inclines in the direction in which the internal space 11b expands as the hopper 11A moves upward, the earth and sand S can flow toward the inclined surface 11p when the cylinder 12 is pushed in. It is possible to reduce the problem of earth and sand S getting caught between the cylinder 12 and the wall portion 11 m.

FIG. 8 is a side view showing the upper screw 14A according to the modified example. As shown in FIG. 8, the upper screw 14A includes a rotating shaft 14b and a transport blade 14d, and the transport blade 14d includes a first blade portion 14g including a blade 14f extending in the first direction B1 and a first direction. It has a second blade portion 14j including a blade 14h extending in a second direction B2 different from B1.

For example, the direction in which the blade 14f of the first blade portion 14g is inclined is opposite to the direction in which the blade 14h of the second blade portion 14j is inclined. That is, the angle formed by the longitudinal direction of the rotating shaft 14b and the first direction B1 is an acute angle, and the angle formed by the longitudinal direction of the rotating shaft 14b and the second direction B2 is an obtuse angle.

The first blade portion 14g is provided on one side in the longitudinal direction of the rotating shaft 14b, and the blade 14f conveys the earth and sand S to the other side in the longitudinal direction as the rotating shaft 14b rotates in one direction. The second blade portion 14j is provided on the other side in the longitudinal direction, and the blade 14h conveys the earth and sand S to one side in the longitudinal direction as the rotating shaft 14b rotates in the one direction. Therefore, when the rotating shaft 14b rotates in the one direction, the earth and sand S is conveyed to the center side in the longitudinal direction of the rotating shaft 14b by the conveying blade 14d.

FIG. 9 is a cross-sectional view showing the cylinder 12A according to the modified example. As shown in FIG. 9, the cylinder 12A has an end face 12b facing the pipe 2 side, and the end face 12b is inclined with respect to a plane orthogonal to the axis of the cylinder 12A. Specifically, the end face 12b is formed diagonally so that its lower portion protrudes. As a result, when the end face 12b is viewed from the direction orthogonal to the end face 12b, the end face 12b has a vertically long elliptical shape. In the case of the cylinder 12A having the end surface 12b, more earth and sand S can be taken into the inside of the cylinder 12A as compared with the cylinder 12 having the end surface parallel to the plane orthogonal to the axis of the cylinder 12.

FIG. 10 is a cross-sectional view showing a pumping facility 10B provided with a hopper 11B according to a modified example. The hopper 11B is provided with a guide portion 11t for guiding the cylinder 12. The guide portion 11t has, for example, a rail shape along the cylinder 12, and is smoothed by the cylinder 12 moving in the axial direction D1 (direction orthogonal to the paper surface in FIG. 10) along the rail-shaped guide portion 11t. It is possible to move the cylinder 12 to.

The hopper 11B includes a wall portion 11s and a bottom portion 11h extending along the vertical direction. The bottom portion 11h has a bottom surface portion 11r located vertically below the upper screw 14 and a protruding portion 11q further protruding vertically downward from the bottom surface portion 11r. The guide portion 11t is interposed between the cylinder 12 and the protruding portion 11q, for example, at the root portion (for example, the upper end) of the protruding portion 11q. As an example, the pumping equipment 10B includes a pair of cylinders 12 arranged along the crossing direction D2, and a protrusion 11q extends vertically downward from each cylinder 12.

The cross-sectional shape of the protrusion 11q is, for example, U-shaped, and the lower screw 15 and the earth and sand discharge port 16 are provided inside the protrusion 11q. In this pumping equipment 10B, the earth and sand S can be accumulated in the protrusion 11q, and the earth and sand S accumulated in the protrusion 11q can be conveyed by each lower screw 15 and discharged from each earth and sand discharge port 16.

The upper screw 14 is provided, for example, between a pair of cylinders 12 arranged along the crossing direction D2. For example, the height of the upper screw 14 in the hopper 11B is higher than the height of the cylinder 12 in the hopper 11B. However, the height of the upper screw 14 in the hopper 11B may be about the same as the height of the cylinder 12, and is not particularly limited.

FIG. 11 is a cross-sectional view showing a pumping facility 10C provided with a hopper 11C according to another modification. The hopper 11C of the pumping equipment 10C includes a rail-shaped guide portion 11t that guides the cylinder 12 as described above. The hopper 11C has the wall portion 11s and the bottom portion 11h described above, and the bottom portion 11h includes a bottom surface portion 11r and a protruding portion 11v.

Unlike the above-mentioned protrusion 11q, the protrusion 11v does not form a space for accommodating the lower screw 15, and is curved along the outer circumference of the cylinder 12. For example, the guide portion 11t is arranged on a curved surface facing the inside of the protruding portion 11v. The hopper 11C does not have to have the protruding portion 11v, and the cylinder 12 may be arranged on a flat surface.

The lower screw 15 (and the earth and sand discharge port 16) is provided, for example, between a pair of cylinders 12 arranged along the crossing direction D2. For example, the height of the lower screw 15 in the hopper 11C is higher than the height of the cylinder 12 in the hopper 11C, but may be about the same, and is not particularly limited. Further, in the hopper 11C, the upper screw 14 is provided directly above the lower screw 15.

Next, the slurry injection device 50 of the earth and sand pumping device 1 will be described. As shown in FIGS. 1 and 12, the slurry injection device 50 is connected to the pumping equipment 10 via the pipe 2. The slurry injection device 50 is provided on the downstream side of the pumping equipment 10 in the pumping path of the earth and sand S.

The distance between the pumping equipment 10 and the slurry injection device 50 is, for example, 10 m or less. However, the distance may be 7 m or less, 5 m or less, 3 m or less, or 2 m or less, and can be changed as appropriate. Further, the position of the slurry injection device 50 may be adjacent to the position of the pumping equipment 10. In this way, when the slurry injection device 50 is arranged at a position close to the pumping equipment 10, the slurry can be supplied over the entire pipe 2 extending from the slurry injection device 50, so that the sediment S inside the pipe 2 is pumped. Can be performed more efficiently.

The slurry injection device 50 includes, for example, a pipe 51, a tank 52, a liquid injection pipe 53, a control device 54, a pressure gauge 55, and a pump 56. The pipe 51 connects, for example, the pipes 2 divided along the axial direction D1 to each other. The tank 52 houses the slurry R, and the liquid injection pipe 53 extends from the control device 54 and communicates with the inside of the pipe 51.

The slurry R is a liquid injected into the inside of the pipe 2 in order to improve the pumping property of the earth and sand S inside the pipe 2. As an example, the slurry R is produced by stirring and mixing water and powder clay put in a pail can with a hand mixer. The slurry R may be prepared by adding a fluidizing agent or bubbles (microbubbles as an example) to clay having a low water content. The density of the slurry R is, for example, 1.2 g / cm ³ or more and 1.5 g / cm ³ or less. This makes it possible to make the viscosity of the slurry R appropriate.

The control device 54 controls at least one of the injection pressure and the injection amount of the slurry R by, for example, inverter control. When the injection pressure control is adopted, the excess slurry R may be injected, so that the control device 54 preferably controls the injection amount of the slurry R. Further, the control device 54 may measure the front pressure of the pump 56 and the internal pressure of the pipe 51, and adjust the injection amount of the slurry R according to the measurement result.

The control device 54 may control the amount of liquid from the tank 52 to the liquid injection pipe 53, and the pressure gauge 55 may measure the pressure inside the pipe 51. The pump 56 controls the injection pressure of the slurry R into the liquid injection pipe 53. The injection pressure of the slurry R from the liquid injection pipe 53 to the inside of the pipe 51 by the pump 56 is set to be equal to or higher than the pressure of the pipe 51. Further, the pump 56 may control the injection amount of the slurry R into the liquid injection pipe 53. In this case, a more appropriate amount of slurry R can be supplied to the pipe 51 and the pipe 2.

As an example, the tube 51 is made of metal. The control device 54 is provided, for example, at a position separated from the pipe 51, and each of the plurality of liquid injection pipes 53 extends from the control device 54. The liquid injection pipe 53 has, for example, a pipe portion 53b made of a flexible material and a fixing portion 53c fixed to the pipe 51.

FIG. 13 is a cross-sectional view when the pipe 51 and the liquid injection pipe 53 are cut in a plane orthogonal to the axial direction D1. As shown in FIGS. 12 and 13, the fixing portion 53c is, for example, a metal member penetrating the opening 51d of the pipe 51 and communicating with the inside of the pipe 51. The opening 51d has, for example, a circular shape, and the diameter of the opening 51d (the outer diameter of the fixed portion 53c) is 2 mm or more and 10 mm or less. When the diameter of the opening 51d is 2 mm or more, the slurry R can be efficiently injected. Further, when the diameter of the opening 51d is 10 mm or less, it is possible to more reliably avoid the cross-sectional defect of the pipe 51.

The pipe portion 53b sends the slurry R from the control device 54 to the fixing portion 53c. The fixed portion 53c has a cylindrical shape, and the slurry R from the pipe portion 53b is injected into the inside of the pipe 51. The fixed portion 53c may be provided with an on-off valve for opening and closing the flow of the slurry R in the fixed portion 53c.

As an example, the number of the injection pipes 53 is 3, and three injection pipes 53 (fixed portions 53c) may be arranged at equal intervals along the circumferential direction of the pipe 51. The slurry R injected from the control device 54 into the inside of the pipe 51 via the pipe portion 53b and the fixing portion 53c adheres to the inner surface of the pipe 51 and extends, for example, from the outlet of the injection pipe 53 in the circumferential direction of the pipe 51. The lubricating layer L is formed on the inner surface 51f of the pipe 51. By forming the lubricating layer L on the inner surface 51f in this way, the earth and sand S can be efficiently pumped inside the pipe 51 and the pipe 2.

The pressure gauge 55 is arranged, for example, on the downstream side of the position where the liquid injection pipe 53 is provided, and measures the pressure inside the pipe 51. The value of the pressure measured by the pressure gauge 55 is output to the control device 54. The control device 54 controls, for example, the amount of slurry R to be injected into the pipe 51 (pipe 2) based on the value of the pressure measured by the pressure gauge 55. As a specific example, the control device 54 outputs a control signal to the pump 56 to control the amount of the slurry R to be injected from the tank 52 into the liquid injection pipe 53. The pressure gauge 55 may be provided on the upstream side of the position where the liquid injection pipe 53 is provided.

FIG. 14 is a diagram showing a cross section of the pipe 51A of the slurry injection device 50 according to the modified example. In the pipe 51A according to the modified example, the number of liquid injection pipes 53 connected is different from that of the pipe 51, and for example, the number of liquid injection pipes 53 connected to the pipe 51A is 20. As an example, 20 liquid injection pipes 53 are arranged at equal intervals along the circumferential direction of the pipe 51A. In this case, since the slurry R is injected into the pipe 51A from 20 points, the lubricating layer L can be formed more efficiently and sufficiently. In this way, the number of injection tubes 53 can be changed as appropriate.

FIG. 15 is a cross-sectional view showing a state of earth and sand S flowing inside the pipe 51 of the slurry injection device 50. As shown in FIG. 15, the inner surface 51f of the pipe 51 is provided with, for example, a check valve 57 for preventing the backflow of the slurry R into the liquid injection pipe 53. A lubricating layer L is continuously formed on the inner surface of the pipe 2 located on the downstream side of the portion of the pipe 51 where the liquid injection pipe 53 is provided.

The lubricating layer L formed by the slurry R injected from the liquid injection pipe 53 into the pipe 51 is interposed between the earth and sand S and the inner surface 51f of the pipe 51. The lubricating layer L is formed not only on the pipe 51 but also on the inner surface of the pipe 2 on the downstream side, whereby efficient pumping of the earth and sand S inside the pipe 2 is realized.

FIG. 16 is a side view showing the slurry injection device 50C according to the modified example. The slurry injection device 50C includes a plurality of liquid injection pipes 53, similar to the slurry injection device 50 described above. The positions of the earth and sand S in the pumping direction X in the plurality of injection pipes 53 are deviated from each other. Therefore, in the slurry injection device 50C, the slurry R can be injected into the inside of the pipe 51 from a plurality of locations where the positions of the pumping directions X are different from each other. In the example of FIG. 16, a plurality of liquid injection pipes 53 are arranged in a staggered manner in the pipe 51. However, the arrangement mode of the plurality of liquid injection pipes 53 in the pipe 51 of the slurry injection device 50C can be appropriately changed. For example, in the pipe 51, a plurality of liquid injection pipes 53 may be arranged in a grid pattern.

FIG. 17 is a cross-sectional view showing a slurry injection device 60 according to a further modification. As shown in FIG. 17, the slurry injection device 60 is, for example, an annular member (or a water injection ring) arranged inside the pipe 2, and the slurry R is formed from an end face 61 of the slurry injection device 60 facing the axial direction. Occur. The slurry R from the end surface 61 forms the lubricating layer L on the inner surface of the pipe 2 as described above. Therefore, even when the slurry injection device 60 is used, the smooth pumping of the earth and sand S can be achieved by forming the lubricating layer L on the inner surface of the pipe 2.

Next, an example of the earth and sand pumping method of earth and sand S according to this embodiment will be described. Hereinafter, an example in which the earth and sand S is pumped by the earth and sand pumping device 1 shown in FIG. 1 will be described. First, the inside of the pipe 2 is moistened (a step of moistening the inner surface of the pipe). Specifically, the slurry injection device 50 is used to flow a mud slurry through the pipe 2 before the earth and sand S is pumped to bring the inner surface of the pipe 2 into a wet state. Water may flow from the slurry injection device 50 to the pipe 2 as a mud slurry.

Then, the slurry R is prepared (step of preparing the slurry). For example, a slurry R is prepared by stirring and mixing water and powder clay put in a 20 L (liter) veil can with a hand mixer. Further, a slurry R may be prepared by adding a fluidizing agent or bubbles to clay having a low water content. The slurry R may be prepared by mixing a dispersant. Dispersants may include, for example, polycarboxylates, naphthalin sulfonates, alkylbenzene sulfonates, or anionic polymers.

As described above, after moistening the inside of the pipe 2, the slurry R is injected into the pipe 2 from the slurry injection device 50 (step of flowing the slurry). At this time, the injection amount of the slurry R may be controlled by the inverter control by the control device 54. For example, the slurry R is injected into the pipe 51 from each of the plurality of injection pipes 53 of the slurry injection device 50 and supplied to the inside of the pipe 2.

Further, as shown in FIGS. 1 and 5, the earth and sand S is put into the hopper 11 and the earth and sand S is pumped (step of pumping the earth and sand). The earth and sand S charged into the hopper 11 is agitated and conveyed by the upper screw 14 and the lower screw 15. Then, the earth and sand S is pumped to the pipe 2 by penetrating the hopper 11 of the cylinder 12 into the internal space 11b and extruding the earth and sand S in the cylinder 12 into the pipe 2 by the piston 13.

For example, when two cylinders 12 are provided in the internal space 11b of the hopper 11, one cylinder 12 and the other cylinder 12 may be inserted alternately. Specifically, one cylinder 12 may be pushed to take the earth and sand S into the one cylinder 12, and when the one cylinder 12 is pulled, the other cylinder 12 may be pushed to take the earth and sand S into the other cylinder 12. .. Then, by alternately pushing the earth and sand S from one cylinder 12 and the other cylinder 12 into the pipe 2 by the piston 13, more efficient pumping of the earth and sand S put into the hopper 11 becomes possible.

Further, the upper screw 14 conveys the earth and sand S by rotation and drops the earth and sand S between the cylinder 12 and the wall portion 11c of the hopper 11 (on the front side of the cylinder 12), and at the same time, stirs the earth and sand S in the internal space 11b to stir the earth and sand mass. You may unravel or move the boulder. On the other hand, the lower screw 15 conveys the earth and sand S by rotation, pushes up the earth and sand S at the bottom portion 11h, and further conveys the boulder and the like that have settled to the bottom portion 11h. In this way, the lower screw 15 suppresses the contact of the boulder with the cylinder 12 by conveying the boulder. Then, the on-off valve 19 opens the earth and sand discharge port 16, and the boulder or the like conveyed by the lower screw 15 is discharged from the hopper 11.

When the upper screw 14 and the lower screw 15 are pumping the earth and sand S, the earth and sand S in the internal space 11b of the hopper 11 may be moved to the pipe 2 side (cylinder penetration direction). In this case, it is possible to prevent the sediment S on the pipe 2 side of the cylinder 12 from becoming insufficient due to the sediment S moving to the cylinder 12 side when the cylinder 12 is pulled out.

As described above, when the earth and sand S is pumped, the earth and sand S is transferred from the pipe 2 to the ground T, and for example, the earth and sand S is loaded on the dump truck D on the ground T. At this time, the modifier is put into the earth and sand S discharged from the pipe 2. The modifier may contain, for example, at least one of quicklime, slaked lime, hemihydrate gypsum, magnesium oxide, flocculant, cement, and cement-based solidifying material. The flocculant may contain, for example, at least one of polyaluminum chloride (PAC), liquid aluminum sulfate (sulfate band), and an organic polymer flocculant. Further, the modifier may contain the trade name "mud DRY" (manufactured by Kunimine Industries, Ltd., main component inorganic mineral (green tough)).

When the modifier is added to the earth and sand S after being pumped by the pipe 2 as described above, for example, the cone index qc of the earth and sand S can be set to 200 kN / m ² or more. The earth and sand S modified by adding the modifier is loaded on, for example, a dump truck D and transferred to a predetermined place. Then, a series of steps of the earth and sand pumping method according to the present embodiment are completed.

Next, the action and effect obtained from the earth and sand pumping device 1 and the earth and sand pumping method according to the present embodiment will be described in detail. In the earth and sand pumping device 1, the earth and sand S is put into the internal space 11b of the hopper 11 and the put in earth and sand S is agitated. The internal space 11b of the hopper 11 is provided with a cylinder 12 that moves in the internal space 11b of the hopper 11 while penetrating the wall portion 11c of the hopper 11, an upper screw 14 arranged above the cylinder 12, and an upper screw 14. Also includes a lower screw 15 arranged below. Therefore, since the earth and sand S can be sufficiently agitated by both the upper screw 14 and the lower screw 15 provided in the upper and lower pairs, the earth and sand S can be efficiently pumped.

The earth and sand pumping device 1 includes, in addition to the pipe 2 from which the earth and sand S is pushed out, an earth and sand discharge port 16 that discharges the earth and sand S conveyed by the lower screw 15 from the internal space 11b of the hopper 11. Therefore, even if the earth and sand S having a high water content or high viscosity and not high fluidity is put into the internal space 11b of the hopper 11, it can be agitated by the lower screw 15 and the earth and sand S conveyed by the lower screw 15 can be agitated. It can be discharged from the discharge port 16.

Therefore, even if the sediment S having low fluidity is thrown in, the sediment S is discharged from the sediment discharge port 16, so that the sediment S can be efficiently taken into the inside of the cylinder 12. Since the pressure load for inserting the cylinder 12 can be reduced, the amount of the earth and sand S pumped per unit time can be increased, and the internal blockage of the pipe 2 can be suppressed. Therefore, even when the viscosity of the earth and sand S is high, the pumping of the earth and sand S can be efficiently performed.

The earth and sand pumping device 1 is connected to the pipe 2 and includes a slurry injection device 50 that injects the slurry R into the inside of the pipe 2 (in the middle of the pipe 2). The slurry R is injected in the middle of the pipe 2 through which the earth and sand S passes by the slurry injection device 50. Therefore, by injecting the slurry R in the middle of the pipe 2, it is possible to reduce the pressure loss on the inner surface of the pipe 2 when the earth and sand S is pumped. Further, the pressure feeding of the earth and sand S inside the pipe 2 can be efficiently performed.

As shown in FIG. 10, the earth and sand pumping device 1 may include a guide portion 11t that guides the movement of the cylinder 12 between the bottom portion 11h of the hopper 11B and the cylinder 12. In this case, since the guide portion 11t guides the movement of the cylinder 12 with respect to the wall portion 11s of the hopper 11, the movement of the cylinder 12 can be stabilized. Therefore, by stabilizing the movement of the cylinder 12, it is possible to efficiently take in the earth and sand S into the inside of the cylinder 12. As a result, the earth and sand S can be efficiently pumped from the cylinder 12 to the pipe 2.

The bottom portion 11h of the hopper 11B may include a protruding portion 11q protruding downward from the guide portion 11t, and a lower screw 15 and a sediment discharge port 16 may be provided inside the protruding portion 11q. In this case, the earth and sand S having low fluidity is accumulated in the protruding portion 11q protruding downward, and then the lower screw 15 is conveyed, and the earth and sand S accumulated inside the protruding portion 11q is discharged from the earth and sand discharge port 16. Therefore, since the earth and sand S having low fluidity can be concentrated and discharged from the earth and sand discharge port 16, the earth and sand S put into the internal space of the hopper 11B can be efficiently pumped.

As shown in FIG. 11, the earth and sand pumping device 1 may include a plurality of cylinders 12, and a lower screw 15 may be provided between the plurality of cylinders 12. In this case, the plurality of cylinders 12 can efficiently pump the earth and sand S from the internal space of the hopper 11C. Further, since the lower screw 15 is provided between the plurality of cylinders 12, each of the plurality of cylinders 12 can take in the earth and sand S agitated by the lower screw 15. Therefore, by taking in the agitated earth and sand S from each cylinder 12, the earth and sand S can be efficiently pumped from the internal space of the hopper 11C.

As shown in FIG. 8, the upper screw 14A has a rotary shaft 14b and a transport blade 14d that transports the earth and sand S while stirring by the rotation of the rotary shaft 14b, and the transport blade 14d rotates from the rotary shaft 14b. The first blade portion 14g extending diagonally in the first direction B1 intersecting the extending direction (axis direction D1) of the shaft 14b, and the first blade portion 14g in the direction intersecting the extending direction from the rotating shaft 14b. The second blade portion 14j extending diagonally in the second direction B2 different from the above is included, and the first blade portion 14g and the second blade portion 14j carry the earth and sand S so as to be closer to the center of the rotation shaft 14b. You may. In this case, since the earth and sand S is conveyed to the center of the rotating shaft 14b by the first blade portion 14g and the second blade portion 14j of the upper screw 14A, the earth and sand S can be moved to the center of the rotating shaft 14b while stirring. Therefore, it is possible to suppress the bias of the earth and sand S in the internal space 11b of the hopper 11.

As shown in FIG. 9, the end surface 12b of the cylinder 12A on the pipe 2 side may be inclined with respect to a plane orthogonal to the axis of the cylinder 12A. In this case, the area of the end face 12b of the cylinder 12A can be increased as compared with the case where the end face of the cylinder is parallel to the plane orthogonal to the axis of the cylinder. Therefore, since a large amount of earth and sand S can be taken in by the cylinder 12A, a large amount of earth and sand S can be efficiently pumped.

The sediment pumping method according to the present embodiment is a sediment pumping method in which the sediment S is pumped using the sediment pumping device 1 exemplified in FIG. 1, and the step of moistening the inner surface of the pipe 2 and the inner surface thereof. A step of flowing the slurry R through the wet pipe 2 is provided. In this earth and sand pressure feeding method, water or the like is flowed through the pipe 2 before the slurry R is flowed through the pipe 2, and the inner surface of the pipe 2 is made wet. Therefore, it is possible to more reliably suppress the blockage of the pipe 2 due to the clogging of the earth and sand S.

The earth and sand pumping method according to the present embodiment may include a step of putting a modifier into the earth and sand S passing through the pipe 2. In this case, after passing the earth and sand S through the pipe 2 through which the slurry R has flowed, the modifier is added to the earth and sand S. Therefore, by modifying the earth and sand S, it is possible to suppress the industrial waste of the earth and sand S.

In the step of flowing the slurry R, the slurry R obtained by mixing the dispersant may be flowed to the pipe 2. In this case, since the dispersant can be mixed to obtain the slurry R, the slurry R can be easily produced even at the site A.

The embodiment of the earth and sand pumping device and the earth and sand pumping method according to the present disclosure has been described above. However, the present invention is not limited to the above-described embodiment, and may be modified or applied to other things without changing the gist described in each claim. That is, the shape, size, function, configuration, number, material and arrangement mode of each part of the sediment pumping device, and the content and order of each step of the sediment pumping method can be appropriately changed without departing from the above gist. be. For example, in the above-described embodiment, the example including two cylinders 12 has been described, but the number of cylinders 12 may be 1 or 3 or more.

For example, in the above-described embodiment, an example in which the slurry injection device 50 is provided on the upstream side of the pipe 2 (near the pumping equipment 10) has been described. However, the arrangement position and number of the slurry injection devices in the pipe 2 can be changed as appropriate. For example, in the pipe 2 extending several hundred meters, a plurality of slurry injection devices may be arranged at regular intervals. Further, it may be a sediment pumping device that does not have a slurry injection device.

Further, in the above-described embodiment, an example in which the sediment pumping device 1 and the sediment pumping method are applied to the site A of a narrow urban civil engineering has been described. However, the type of site to which the earth and sand pumping device and the earth and sand pumping method are applied is not limited to the site of urban civil engineering, and may be, for example, a site for constructing a shield tunnel, a site for seaside, or a site for constructing an open caisson. Well, it can be changed as appropriate.

1 ... earth and sand pumping device, 2 ... piping, 10,10A, 10B, 10C ... pumping equipment, 11,11A, 11B, 11C ... hopper, 11b ... internal space, 11c, 11m, 11s ... wall, 11d ... outer surface, 11h ... bottom, 11j ... through hole, 11k ... screen, 11p ... inclined surface, 11q ... protruding part, 11r ... bottom part, 11t ... guide part, 11v ... protruding part, 12, 12A ... cylinder, 12b ... end face, 13 ... piston , 14, 14A ... Upper screw, 14b ... Rotating shaft, 14c, 14d ... Conveying blade, 14f ... Blade, 14g ... First blade, 14h ... Blade, 14j ... Second blade, 15 ... Lower screw, 15b ... Rotation Shaft, 15c ... Conveying blade, 16 ... Sediment discharge port, 17 ... Vibrator, 18 ... Connection, 18b ... Opening, 18c ... On-off valve, 19 ... On-off valve, 50, 50C, 60 ... Slurry injection device, 51, 51A ... Pipe, 51d ... Opening, 51f ... Inner surface, 52 ... Tank, 53 ... Liquid injection pipe, 53b ... Pipe part, 53c ... Fixed part, 54 ... Control device, 55 ... Pressure gauge, 56 ... Pump, 57 ... Backflow prevention valve, 61 ... End face, A ... Site, A1 ... Construction yard, B1 ... First direction, B2 ... Second direction, D ... Dump truck, D1 ... Axial direction, D2 ... Crossing direction, G ... Ground, L ... Lubricating layer, R ... Slurry, S ... Earth and sand, T ... Ground, X ... Pumping direction.

Claims (10)

It is an earth and sand pumping device that pumps earth and sand.
Piping through which earth and sand pass,
A hopper that has an internal space that communicates with the pipe and in which earth and sand are poured into the internal space.
A cylinder that can move in the internal space while penetrating the wall of the hopper,
A piston that pushes the earth and sand that has entered the cylinder into the pipe,
An upper screw, which is arranged above the cylinder in the internal space and conveys earth and sand thrown into the internal space,
A lower screw, which is arranged below the upper screw in the internal space and conveys earth and sand thrown into the internal space,
An earth and sand discharge port formed on the wall of the hopper and discharging the earth and sand conveyed by the lower screw from the internal space, and the earth and sand discharge port.
A sediment pumping device equipped with. It is connected to the pipe and includes a slurry injection device for injecting slurry into the inside of the pipe.
The earth and sand pumping device according to claim 1. A guide portion for guiding the movement of the cylinder is provided between the bottom of the hopper and the cylinder.
The earth and sand pumping device according to claim 1 or 2. The bottom of the hopper includes a protrusion that projects downward from the guide.
The lower screw and the earth and sand discharge port are provided inside the protrusion.
The earth and sand pumping device according to claim 3. Equipped with multiple cylinders
The lower screw is provided between the plurality of cylinders.
The earth and sand pumping device according to any one of claims 1 to 3. The upper screw has a rotary shaft and a transport blade for transporting earth and sand while stirring by the rotation of the rotary shaft.
The transport blade has a first blade portion that extends diagonally from the rotation axis in a direction intersecting the extending direction of the rotation axis, and the first blade having a direction intersecting the rotation axis in the extending direction. It includes a second blade portion that extends diagonally in a direction different from that of the portion.
The first blade portion and the second blade portion carry earth and sand so as to be closer to the center of the rotation axis.
The earth and sand pumping device according to any one of claims 1 to 5. The end face of the cylinder on the pipe side is inclined with respect to a plane orthogonal to the axis of the cylinder.
The earth and sand pumping device according to any one of claims 1 to 6. A method for pumping sediment using the sediment pumping device according to any one of claims 1 to 7.
The process of moistening the inner surface of the pipe and
The step of flowing the slurry through the pipe whose inner surface is moistened, and
A method of pumping earth and sand. A step of putting a modifier into the earth and sand passing through the pipe is provided.
The earth and sand pumping method according to claim 8. In the step of flowing the slurry, the slurry obtained by mixing the dispersant is flowed to the pipe.
The earth and sand pumping method according to claim 8 or 9.

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