JP2017075470A - Sand transport method, sand transport apparatus, and hopper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sand transport method, a sand transport apparatus, and a hopper for efficiently transporting sand spread on a trough formed in an underground utility tunnel to a ground surface.SOLUTION: A sand transport method is for transporting sand spread on a trough formed in an underground utility tunnel to a ground surface, and includes a preparatory step for installing necessary equipment in the utility tunnel, and a discharging step for discharging the sand on the trough to the ground surface by a force-feed system. The discharging step includes a sand throw-in step for throwing the sand taken out from the trough into a hopper, and a force-feeding step for force-feeding the sand thrown into the hopper to the ground surface. For the sand throw-in step, at least two sand throw-in ports are formed on the hopper, for throwing the sand alternately into the two sand throw-in ports.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sand transport method, a sand transport device, and a hopper.

  An OF cable (Oil Filled Cable) is used as a power cable for underground transmission of high-voltage power. The OF cable has an insulating layer provided by winding insulating paper around the outer periphery of the conductor, and the insulating paper is impregnated with oil. For this reason, when a short circuit occurs in the OF cable, there is a risk that the oil will ignite and damage will increase. Therefore, in order to suppress the spread of fire due to oil at the time of a short circuit, the OF cable is accommodated in a state of being buried in sand in a trough provided in an underground tunnel (for example, Patent Document 1).

  By the way, in recent years, with the aging of the OF cable, the replacement from the OF cable to a CV cable (Cross-linked polyethylenylated sheared cable) has been promoted. Since oil is not used in the CV cable and it is not necessary to bury the CV cable in the sand, the sand in the trough is removed when the OF cable is replaced with the CV cable.

Japanese Unexamined Patent Publication No. 7-322459

  Until now, most of the steps to remove the sand in the trough were done manually by the workers. Specifically, first, the sand in the trough is taken out manually, and the taken-out sand is packed in a sandbag. Next, a sandbag filled with sand is placed on the carriage and transported to the manhole. Next, the sandbag is carried out to the ground by a hoist provided on the ground.

  However, according to the conventional methods, there are various restrictions on the work in the narrow environment in the cave, so that each work takes time and it is difficult to perform each work in parallel. For this reason, there existed a tendency for the whole work period to become long. Moreover, many workers are required for each work, and the cost for the whole work has increased.

  In addition, it is conceivable to mechanize each work as a method other than manual work. However, in a narrow environment in a cave, there are only a limited number of equipment that can be carried in, so it is difficult to mechanize the work. Moreover, since the sand spread | treaded in a trough may have the part hardened with the passage of time, this point also became a factor which made mechanization difficult.

  An object of the present invention is to provide a sand transport method, a sand transport device, and a hopper capable of efficiently transporting sand when transporting sand laid in a trough provided in an underground cave to the ground. Is to provide.

According to one aspect of the invention,
A sand transport method for transporting sand laid in a trough provided in a tunnel in the ground to the ground,
A preparation process for installing necessary equipment in the cave;
A discharge step of discharging the sand in the trough to the ground by a pressure feeding method,
The discharging step is
A sand loading step of loading sand taken out from the trough into a hopper;
A pumping step of pumping the sand thrown into the hopper to the ground,
In the sand charging process,
A sand transport method is provided in which at least two sand throwing portions are provided in the hopper, and sand is alternately thrown into the two sand throwing portions.

According to another aspect of the invention,
A sand transport device for transporting sand laid in a trough provided in a tunnel in the ground to the ground,
A hopper into which sand taken out from the trough is charged;
A blower for pumping sand thrown into the hopper to the ground;
A transport pipe that constitutes a flow path of sand pumped from the hopper,
The hopper has at least two sand throwing portions, and a sand transport device configured to alternately throw sand into the two sand throwing portions is provided.

According to yet another aspect of the invention,
A hopper used in a sand transport device for transporting sand laid in a trough provided in an underground tunnel to the ground,
At least two sand input portions into which sand taken out from the trough is input;
Sand received in each of the two sand input portions by its own weight falling, and a sand receiving portion constituting a part of a flow path for pressure-feeding the sand;
A first switch for opening and closing a first sand transfer port between the first sand input portion of the two sand input portions and the sand receiving portion;
A second switch for opening and closing a second sand transfer port between the second sand input portion of the two sand input portions and the sand receiving portion;
There is provided a hopper provided with a lid capable of selectively closing an upper opening of each of the two sand throwing portions.

  According to the present invention, a sand transport method, a sand transport device, and a hopper capable of efficiently transporting sand when transporting sand laid in a trough provided in an underground cave to the ground are provided. Provided.

It is a schematic diagram which shows the sand transport apparatus which concerns on 1st Embodiment of this invention. It is a front view which shows the hopper which concerns on 1st Embodiment of this invention. (A) is a front view showing the sand throwing part, (b) is a right side view showing the sand throwing part, (c) is a plan view showing the sand throwing part, (d) is It is a front view which shows a switch, (e) is a right view which shows a switch, (f) is a top view which shows a switch. (A) is sectional drawing which shows a coupling, (b) is sectional drawing which shows a relay part. It is a flowchart in the sand transport method which concerns on 1st Embodiment of this invention. (A)-(d) is a schematic diagram which shows a sand injection | throwing-in process. (A)-(d) is a schematic diagram which shows a sand injection | throwing-in process. It is a schematic diagram which shows the sand transport apparatus which concerns on 2nd Embodiment of this invention.

<First Embodiment of the Present Invention>
(1) Sand transport apparatus The outline | summary of the sand transport apparatus which concerns on 1st Embodiment of this invention is demonstrated using FIG. FIG. 1 is a schematic diagram showing a sand transport device according to the present embodiment. In addition, the white arrow in FIG. 1 has shown the flow of sand, ie, a pumping direction.

  As shown in FIG. 1, for example, a cave 92 extending in the horizontal direction and a manhole 94 that connects the cave 92 and the ground are provided in the ground. For example, a trough (not shown) is provided in the cave 92, and an OF cable (not shown) is housed in the trough as a power cable for underground power transmission. As described above, the OF cable is accommodated in the trough embedded in the sand 100 (river sand). For example, the trough is filled with about 100 tons of sand 100 per 10 m of trough length.

  The sand transport device 10 of the present embodiment is configured to transport the sand 100 laid in a trough so as to cover the OF cable to the ground when the old OF cable is replaced with a CV cable. The sand transport device 10 is configured to transport the sand 100 by a pressure feeding method, and specifically includes, for example, a hopper 200, a transport pipe 300, and a blower (400, 500).

  In the following, the “length direction” of the transport pipe 300 or the like can be referred to as the axial direction of the transport pipe 300 or the longitudinal direction of the transport pipe 300. The “pressure feeding direction” means a direction in which compressed air flows or a direction in which sand 100 flows. The “upstream side” or “downstream side” is based on the pumping direction.

  The hopper 200 is configured to throw sand 100 in the trough. The hopper 200 of the present embodiment includes, for example, at least two sand throwing units (a first sand throwing unit 210a and a second sand throwing unit 210b described later).

  The transport pipe 300 is configured as a long cylinder, for example, and configures a flow path of the sand 100 that is pumped from the hopper 200. The transport pipe 300 is provided, for example, extending from the hopper 200 to the manhole 94 in the sinus 92 along the OF cable. Further, the transport pipe 300 is bent so as to rise vertically upward in the manhole 94 and extends to the dump truck 800 on the ground. The sand 100 pumped from the hopper 200 is transported to the dump truck 800 on the ground through the transport pipe 300.

  The transport pipe 300 is preferably configured to withstand the pressure at the time of pumping, and is composed of, for example, an impact-resistant vinyl chloride pipe (HI pipe) or a suction hose. A part of the transport pipe 300 may be made of an iron pipe. Moreover, the full length of the transport pipe 300 is 600 m or less, for example. Further, the diameter of the transport pipe 300 is, for example, 60 mm or more and 90 mm or less (nominal diameter (nominal diameter) of 50 A or more and 75 A or less). The diameter of the transport pipe 300 does not need to be uniform in the length direction. For example, the diameter of the portion where the flow velocity should be increased (for example, the most upstream portion or the portion extending vertically in the manhole) is the same as that of other portions. You may make it thinner than a diameter.

  The blower is configured to pump the sand 100 put into the hopper 200 to the ground. In the present embodiment, a plurality of blowers (a sending blower 400 and a relay blower 500) are provided.

The sending blower 400 is connected to the upstream side of the hopper 200, and is configured to pressure-feed the sand 100 into the transport pipe 300 by supplying compressed air to the sand in the hopper 200. The output of the sending blower 400 is larger than the output of the relay blower 500 described later, for example, 5.4 kW. Moreover, the air volume of the sending blower 400 is, for example, 6.0 m ³ / min. A plurality of sending blowers 400 may be provided for one hopper 200. Thereby, the transport distance of the sand 100 from the hopper 200 can be extended.

The relay blower 500 is connected to a position between the hopper 200 and the ground in the transport pipe 300, and further supplies compressed air to the sand in the transport pipe 300, whereby the sand 100 in the transport pipe 300. Configured to facilitate flow. A plurality of relay blowers 500 are provided at predetermined intervals in the length direction of the transport pipe 300. The interval between the relay blowers 500 is, for example, 10 m or more and 300 m or less. The output of each relay blower 500 is, for example, 3.7 kW, and the air volume is, for example, 6.0 m ³ / min.

  In this way, not only the sand 100 is pumped by the sending blower 400 alone, but also the sand 100 is pumped while being relayed by the relay blower 500, so that the transport distance of the sand 100 can be maximized. .

  Hereinafter, the details of each member constituting the sand transport device 10 will be described.

(Around hopper)
A configuration around the hopper 200 according to the present embodiment will be described with reference to FIGS. 2 and 3. FIG. 2 is a front view showing the hopper according to the present embodiment. FIG. 3 (a) is a front view showing the sand throwing portion, FIG. 3 (b) is a right side view showing the sand throwing portion, and FIG. 3 (c) is a plan view showing the sand throwing portion. 3 (d) is a front view showing the switch, FIG. 3 (e) is a right side view showing the switch, and FIG. 3 (f) is a plan view showing the switch. . In FIG. 3C, the lid 220 is omitted.

  As shown in FIG. 2, the hopper 200 of the present embodiment includes, for example, at least two sand throwing portions (a first sand throwing portion 210 a and a second sand throwing portion 210 b), a lid 220, and a sand receiving portion 250. And a first switch 240a and a second switch 240b.

  The hopper 200 according to the present embodiment includes the first sand input unit 210a and the second sand input unit 210b, so that the sand 100 is input alternately to the first sand input unit 210a and the second sand input unit 210b. It is configured to Thereby, the sand 100 can be continuously pumped without stopping the operation of the blower 400 for delivery.

  As shown in FIGS. 2 and 3 (a) to 3 (c), the first sand throwing portion 210a has a hollow portion penetrating in the vertical direction, and the upper opening is configured as a cylindrical body wider than the lower opening. Has been. Specifically, the first sand throwing portion 210a has, for example, a quadrangular pyramid shape that is opposite in the vertical direction. The cross section in the horizontal direction of the first sand throwing portion 210a gradually decreases as it goes vertically downward. As a result, the first sand throwing portion 210a collects the sand 100 thrown from the upper opening into the first sand delivery port 230a as the lower opening.

  On the other hand, the second sand throwing part 210 b is provided adjacent to the first sand throwing part 210 a in the length direction of the transport pipe 300. The second sand throwing part 210b is configured symmetrically with the first sand throwing part 210a across the vertical plane. Similar to the first sand throwing part 210a, the second sand throwing part 210b collects the sand 100 thrown from the upper opening into the second sand delivery port 230b as the lower opening.

  The lid | cover 220 is comprised so that the upper opening which each of the 1st sand injection | throwing-in part 210a and the 2nd sand injection | throwing-in part 210b has can be selectively obstruct | occluded. Specifically, a hinge 222 is provided on one side of the lid 220. The hinge 222 is arranged perpendicular to the pumping direction between the upper opening of the first sand throwing portion 210a and the upper opening of the second sand throwing portion 210b. Thereby, the lid | cover 220 selectively obstruct | occludes each upper opening of the 1st sand injection | throwing-in part 210a and the 2nd sand injection | throwing-in part 210b by rotating with the hinge 222 as an axis | shaft.

  The first sand throwing part 210a and the second sand throwing part 210b are each provided with a first bolt 224a and a second bolt 224b. Accordingly, when the lid 220 closes the upper opening, the lid 220 can be fixed by the first bolt 224a and the second bolt 224b, respectively.

  Note that a lid window portion (not shown) made of a transparent plate is provided at the center of the lid 220. Thereby, it is possible to confirm whether or not all the sand 100 has been pumped from each of the first sand throwing portion 210a and the second sand throwing portion 210b through the lid window portion.

  Moreover, the 1st vibrator 280a and the 2nd vibrator 280b are provided so that each side surface of the 1st sand throwing-in part 210a and the 2nd sand throwing-in part 210b may be contact | connected. The first vibrator 280a and the second vibrator 280b are configured such that when the sand 100 is thrown into the first sand throwing part 210a and the second sand throwing part 210b, the first sand throwing part 210a and the second vibrator Each sand throwing part 210b is configured to vibrate. Thereby, in each of the first sand throwing portion 210a and the second sand throwing portion 210b, the sand 100 can be easily dropped by its own vibration due to the vibrations of the first vibrator 280a and the second vibrator 280b. The sand 100 can be prevented from staying.

  The sand receiving part 250 is provided on each of the first sand input part 210a and the second sand input part 210b vertically below. Thereby, the sand receiving part 250 is comprised so that the sand 100 thrown into each of the 1st sand throwing-in part 210a and the 2nd sand throwing-in part 210b may be received by the dead weight fall of this sand 100. The upstream end of the sand receiver 250 is connected to the delivery blower 400 via the suction hose 420, and the downstream end of the sand receiver 250 is connected (welded) to the transport pipe 300 made of an iron pipe. . Thereby, the sand receiving part 250 comprises a part of flow path for pumping the sand 100.

  In addition, it is preferable that the bottom part of the sand receiving part 250 is flat so that the sand 100 can be easily received from each of the first sand input part 210a and the second sand input part 210b. In order to form the bottom part of the sand receiving part 250 flatly, it is preferable that the sand receiving part 250 consists of steel materials, for example.

  As shown in FIGS. 2 and 3D to 3E, the first switch 240a opens and closes the first sand transfer port 230a between the first sand throwing portion 210a and the sand receiving portion 250. It is configured to Specifically, the first switch 240a includes, for example, a first switch plate 242a and a first hydraulic cylinder 244a. The first opening / closing plate 242a is connected to one end of the movable shaft of the first hydraulic cylinder 244a. Thus, the first hydraulic cylinder 244a opens and closes the first sand transfer port 230a by moving the first opening / closing plate 242a in the axial direction.

  On the other hand, the second switch 240b is configured to open and close the second sand transfer port 230b between the second sand input part 210b and the sand receiver 250. Specifically, the second switch 240b includes a second switch plate 242b and a second hydraulic cylinder 244b in the same manner as the first switch 240a. Thus, the second hydraulic cylinder 244b opens and closes the second sand transfer port 230b by moving the second opening / closing plate 242b in the axial direction.

  Note that guide portions 270 are provided on both sides in the width direction in the upper portion of the sand receiving portion 250. The guide portion 270 is provided along the length direction of the sand receiving portion 250 and is provided so as to surround the long sides of the first opening / closing plate 242a and the second opening / closing plate 242b. Thus, the guide unit 270 guides the movement of the first opening / closing plate 242a and the second opening / closing plate 242b when the first opening / closing plate 242a and the second opening / closing plate 242b are opened and closed, and the first opening / closing plate 242b. The opening / closing plate 242a and the second opening / closing plate 242b are prevented from falling off.

  As shown in FIG. 2, a first support 260 a and a second support 260 b that support the hopper 200 are provided below the sand receiver 250. The second support portion 260b provided on the downstream side is shorter than the first support portion 260a provided on the upstream side, and the entire hopper 200 is inclined in the pressure feeding direction (the length direction of the transport pipe 300). It is like that. Thereby, the sand 100 dropped by its own weight in the sand receiving portion 250 can be slid by the inclination of the hopper 200 and can be easily flowed in the pressure feeding direction.

  The hopper 200 configured as described above can be disassembled, for example. Specifically, for example, the hopper 200 is configured so that the first sand input unit 210a, the second sand input unit 210b, the lid 220, and the first sand input unit 210a illustrated in FIGS. A member formed by connecting the vibrator 280a and the second vibrator 280b is connected to the first switch 240a, the second switch 240b, and the sand receiving portion 250 shown in FIGS. The first support portion 260a and the second support portion 260b can be disassembled into four members. Thereby, the hopper 200 can be easily conveyed through the opening 96 of the narrow manhole 94.

(Fitting)
Next, the joint 320 of this embodiment is demonstrated using Fig.4 (a). Fig.4 (a) is sectional drawing which shows a coupling. In addition, the white arrow in Fig.4 (a) has shown the pumping direction.

  As shown in FIG. 4A, the joint 320 is configured to connect a pair of transport pipes 300 having a predetermined length (for example, 4 m) with their axes aligned. Specifically, for example, the joint 320 is configured as a cylindrical body having a hollow portion that penetrates, and is made of, for example, vinyl chloride. The upstream transport pipe 300 is inserted into the upstream opening of the joint 320. In this state, the bolt 340 is inserted into the through hole (not shown) of the joint 320 and the through hole (not shown) of the upstream transport pipe 300. The head of the bolt 340 is covered with a tape 360 for preventing the drop and fixed to the joint 320. Thereby, the upstream transport pipe 300 is fixed to the joint 320. On the other hand, the transport pipe 300 on the downstream side is inserted into the opening on the downstream side of the joint 320 and is fixed to the joint 320 via the adhesive 330.

  Thus, the downstream transport pipe 300 is fixed to the joint 320 with an adhesive, and the joint 320 is locked to the upstream transport pipe 300 by the bolt 340. If the upstream transport pipe is fixed to the joint with an adhesive and the downstream transport pipe is locked to the joint by a bolt, the bolt may come off during operation or downstream. If the transport pipe on the side moves downstream, the transport pipe on the downstream side may come off the joint, and the sand being transported may be scattered. On the other hand, when the downstream transport pipe 300 is fixed to the joint 320 with an adhesive and the joint 320 is locked to the upstream transport pipe 300 by a bolt 340 as in the present embodiment, the operation is performed. Even if the bolt 340 is removed or the upstream transport pipe 300 moves downstream, the upstream transport pipe 300 comes into contact with the upstream end of the downstream transport pipe 300 in the joint 320 from the joint 320. Detachment is suppressed. As a result, it is possible to suppress the sand being transported from being scattered.

  In the joint 320, a predetermined gap is provided between the upstream transport pipe 300 and the downstream transport pipe 300. As a result, even if the downstream transport pipe 300 is moved by hitting the joint of the downstream transport pipe 300 in the joint 320 and the downstream transport pipe 300 moves, the gap of the transport pipe 300 is absorbed by the gap in the next joint 320. can do.

  Further, if the bolt 340 is removed, the joint 320 can be easily removed from the transport pipe 300 on the upstream side. Thereby, according to the transport condition of the sand 100, it becomes possible to adjust the full length of the transport pipe 300. FIG.

(Relay part)
Next, the relay unit 600 according to the present embodiment will be described with reference to FIG. FIG. 4B is a cross-sectional view showing the relay portion. In addition, the white arrow in FIG.4 (b) has shown the pumping direction. Further, a case where a pair of transport pipes 300 having different diameters is connected via the relay unit 600 is illustrated.

  As shown in FIG. 4B, the relay unit 600 is provided at an intermediate position of the transport pipe 300 and is configured to be connected to a relay blower 500 that promotes the flow of the sand 100 in the transport pipe 300. . Specifically, the relay part 600 is comprised as a cylindrical body which has the hollow part penetrated, for example, consists of iron. An iron nozzle 540 is welded to the peripheral side surface of the relay unit 600. The nozzle 540 is provided along the length direction (pressure feeding direction) of the relay unit 600, and the opening on the downstream side of the nozzle 540 is directed to the downstream side of the relay unit 600. A relay blower 500 is connected to the upstream side of the nozzle 540 via a suction hose 520. The transport pipe 300 may be used to connect the relay blower 500 to the nozzle 540. With such a configuration, compressed air can be supplied from the relay blower 500 to the sand in the transport pipe 300 via the suction hose 520 and the nozzle 540. Moreover, by using the nozzle 540 provided along the length direction of the relay part 600, compressed air can be supplemented without countering the flow of the sand 100 in the relay part 600.

  A window portion 630 made of a transparent plate is provided on the peripheral side surface of the relay portion 600. Thereby, the flow of the sand 100 in the relay part 600 can be confirmed through the window part 630.

  Note that the relay unit 600 may be provided with a pressure gauge 640. For example, when the pressure value of the pressure gauge 640 becomes higher than a predetermined value, it can be determined that clogging has occurred in the transport pipe 300.

  The relay unit 600 is configured to connect a pair of transport pipes 300. An upstream transport pipe 300 is connected to the upstream side of the relay unit 600 via a socket 610 and an adapter 620. For example, the socket 610 is made of vinyl chloride, and the adapter 620 is made of iron.

  A specific connection mode will be described from the upstream side. The upstream transport pipe 300 is inserted into the upstream opening of the socket 610. In this state, the bolt 612 is inserted into the through hole (not shown) of the socket 610 and the through hole (not shown) of the upstream transport pipe 300. Note that the head of the bolt 612 is covered with a tape 614 for preventing the drop and fixed to the socket 610. Thereby, the upstream transport pipe 300 is fixed to the upstream side of the socket 610. The downstream side of the socket 610 is a male screw, and the upstream side of the adapter 620 is a female screw. Thereby, the downstream side of the socket 610 is screwed to the upstream side of the adapter 620. The diameter on the downstream side of the adapter 620 is larger than the diameter on the upstream side of the adapter 620 so as to correspond to the diameter of the relay unit 600. Further, the downstream side of the adapter 620 is a male screw, and the upstream side of the relay unit 600 is a female screw. Thereby, the downstream side of the adapter 620 is screwed to the upstream side of the relay unit 600. In this way, the relay unit 600 having different diameters and the upstream transport pipe 300 can be connected.

  On the other hand, a downstream transport pipe 300 is connected to the downstream side of the relay unit 600 via a socket 650, a connection pipe 660, and a coupling 670. The socket 650, the connecting pipe 660, and the coupling 670 are each made of vinyl chloride.

  A specific connection mode will be described from the downstream side. The downstream transport pipe 300 is inserted into an opening on the downstream side of the coupling 670 and fixed to the downstream side of the coupling 670 via an adhesive (not shown). Has been. Further, the downstream side of the connection pipe 660 is inserted into the opening on the upstream side of the coupling 670. In this state, the bolt 672 is inserted into a through hole (not shown) of the coupling 670 and a downstream through hole (not shown) of the connection pipe 660. The head portion of the bolt 672 is covered with a tape 674 for preventing the drop and fixed to the coupling 670. Thereby, the connecting pipe 660 is fixed to the upstream side of the coupling 670. Further, the upstream side of the connection pipe 660 is inserted into the opening on the downstream side of the socket 650 and fixed to the downstream side of the socket 650 via an adhesive (not shown). The upstream diameter of the socket 650 is smaller than the downstream diameter of the socket 650 so as to correspond to the diameter of the relay portion 600. Further, the upstream side of the socket 650 is a male screw, and the downstream side of the relay unit 600 is a female screw. Accordingly, the upstream side of the socket 650 is screwed to the downstream side of the relay unit 600. In this way, the relay unit 600 having different diameters can be connected to the transport pipe 300 on the downstream side.

(2) Sand transport method Next, the sand transport method according to the present embodiment will be described with reference to FIG. FIG. 5 is a flowchart according to the sand transport method according to the present embodiment. Note that step is abbreviated as S.

(S100: preparation step)
First, a preparation step S100 for installing necessary equipment in the cave 92 is performed. The preparation step S100 includes a carry-in step S100 and an assembly step S120 as follows.

(S110: carry-in process)
Necessary equipment such as the hopper 200, the transport pipe 300, the delivery blower 400, and the relay blower 500 is carried into the sinus 92 from the ground through the opening 96 of the manhole 94. At this time, the hopper 200 is carried into the cave 92 from the ground in a disassembled state. Specifically, the first sand throwing part 210a, the second sand throwing part 210b, the lid 220, the first vibrator 280a, and the second vibrator 280b shown in FIGS. 3A to 3C are connected. A member formed by connecting the first switch 240a, the second switch 240b, and the sand receiver 250 shown in FIGS. 3D to 3F, and a first support 260a. The hopper 200 is disassembled and carried into the second support portion 260b (to four members).

(S120: Assembly process)
After carrying in the necessary equipment, the sand transport device 10 is assembled in the cave 92. Specifically, for example, first, the hopper 200 and the delivery blower 400 are arranged at a position away from the manhole 94 for discharging the sand 100 by a predetermined distance. Next, the disassembled hopper 200 is assembled. Next, the hopper 200 and the sending blower 400 are connected. Next, the transport pipe 300 is connected to the hopper 200. Then, the transport pipe 300 is extended along the OF cable while connecting the pair of transport pipes 300 via the joint 320. At this time, the relay unit 600 is provided at predetermined intervals in the length direction of the transport pipe 300, and the relay blower 500 is connected to each relay unit 600. Next, the transport pipe 300 is bent so as to rise vertically upward in the manhole 94 and extends to the dump truck 800 on the ground.

(S200: Discharge process)
Next, around the hopper 200, the sand 100 laid in the trough so as to cover the OF cable is taken out manually and packed in a sandbag. And the discharge process S200 which discharges the sand 100 taken out from the inside of the trough to the ground by a pumping method is performed. The discharging step S200 may be performed after all the sand 100 in the trough is taken out, or the discharging step S200 may be performed in parallel while taking out the sand 100 in the trough. The discharging step S200 includes a sand charging step S210 and a pressure feeding step S220 as described below.

(S210: Sand input process)
Next, the sand 100 taken out from the trough is put into the hopper 200. In the present embodiment, the sand 100 is alternately put into the first sand throwing portion 210a and the second sand throwing portion 210b. Details of this step will be described later.

(S220: Pressure feeding process)
Then, the compressed air is supplied from the sending blower 400 to the sand in the hopper 200, so that the sand 100 is pumped into the transport pipe 300. Moreover, the flow of the sand 100 in the transport pipe 300 is promoted by further supplying compressed air to the sand 100 in the transport pipe 300 from the relay blower 500. Thereby, the sand 100 is pumped to the dump truck 800 on the ground.

  The above sand throwing step S210 and pumping step S220 are not performed independently and discontinuously, but are performed continuously in parallel. That is, while the pressure feeding step S220 is being performed on the sand 100 that has been thrown in the sand throwing step S210 before a predetermined time, the sand throwing step S210 in which new sand 100 is thrown into the hopper 200 is performed.

(S230: predetermined amount discharge determination)
Thereafter, it is determined whether or not a predetermined amount of sand 100 has been discharged (S230). When the amount of sand 100 discharged is less than the predetermined amount (No in S230), the steps of sand input step S210 and pressure feeding step S220 are repeated. On the other hand, when the predetermined amount of sand 100 is discharged (Yes in S230), the series of discharging steps S200 is terminated.

(Hopper movement process)
After discharging a predetermined amount of sand 100 in the discharging step S200, the joint 320 at a position where the sand 100 in the trough has not yet been removed is removed, and the hopper 200 and the delivery blower 400 are connected to the part from which the joint 320 has been removed. Thus, the overall length of the transport pipe 300 is shortened. Then, the sand 100 in the trough is taken out around the hopper 200 after the movement, and the sand 100 is put into the hopper 200 after the movement, thereby performing the discharging step S200 described above.

  The above discharging step S200 and the hopper moving step are repeated, and the positions of the hopper 200 and the sending blower 400 are gradually brought closer to the manhole 94. In this way, the sand 100 in the trough can be removed over the entire length of the sinus 92.

(CV cable exchange process)
After all the sand 100 in the trough is removed over the entire length of the cave 92, the OF cable is removed from the trough. Then, the trough storing the OF cable is removed, and the CV cable is installed in the vacant space. Thus, the exchange from the OF cable to the CV cable is completed.

(3) Sand input process Here, the above-mentioned sand input process S210 is demonstrated in detail using FIG.2, FIG.6 and FIG.7. FIG. 6A to FIG. 7D are schematic views showing a sand throwing process.

(Initial loading step)
First, in the state where the first sand transfer port 230a and the second sand transfer port 230b are closed by the first switch 240a and the first switch 240b, respectively, the sending blower 400 and the relay blower 500 are closed. Start driving. In the subsequent discharging step S200, the sending blower 400 and the relay blower 500 are always in an operating state. In addition, the first vibrator 280a and the second vibrator 280b provided in each of the first sand throwing unit 210a and the second sand throwing unit 210b are operated.

  Next, as shown in FIG. 2, the sand 100 taken out from the trough and put in the sandbag bag is filled with the first sand with the first sand transfer port 230a and the second sand transfer port 230b closed. It throws in the throwing part 210a. At this time, the amount of sand 100 put into the sand throwing unit at a time is, for example, about 20 kg.

(First lid switching step)
Next, as shown in FIG. 6A, the upper opening of the first sand throwing portion 210a is closed with a lid 220 in a state where the sand 100 is thrown into the first sand throwing portion 210a.

(First sand delivery step)
Next, as shown in FIG. 6B, the first switch 240a is used to open the first sand delivery port 230a, and the sand 100 is dropped from the first sand throwing part 210a onto the sand receiving part 250 by its own weight. At this time, the sand 100 that has fallen by its own weight from the first sand throwing-in portion 210a to the sand receiving portion 250 is pressure-fed to the transport pipe 300 by the compressed air supplied from the sending blower 400 to the sand receiving portion 250.

(Second sand input step)
As shown in FIG. 6C, while the sand 100 thrown into the first sand throwing portion 210a is being pumped, the second sand delivery port 230b is closed by the second switch 240b. Sand 100 is thrown into the second sand throwing part 210b.

  When the sand 100 is thrown into the second sand throwing portion 210b, the second sand delivery port 230b is closed as described above. Thereby, even if compressed air is always supplied to the sand receiver 250 from the blower 400 for delivery, it is possible to suppress the compressed air from being ejected from the sand receiver 250 and to suppress the rising of the sand.

  Further, when the sand 100 is put into the second sand throwing part 210b, the upper opening of the first sand throwing part 210a during sand pressure feeding is closed by the lid 220. Thereby, it can suppress that compressed air blows out from the 1st sand throwing-in part 210a, and can suppress that the sand 100 currently pumping in the 1st sand throwing-in part 210a soars.

(First closing step)
By looking at the inside of the first sand throwing part 210a through the lid window part of the lid 220, it is confirmed whether or not all the sand 100 thrown into the first sand throwing part 210a has been pumped.

  And as shown in FIG.6 (d), when all the sand 100 thrown into the 1st sand throwing-in part 210a is pumped, the 1st switch 240a will close the 1st sand delivery port 230a.

(Second lid switching step)
Next, as shown in FIG. 7A, the upper opening of the second sand throwing portion 210b is closed with a lid 220 in a state where the sand 100 is thrown into the second sand throwing portion 210b.

(Second sand delivery step)
Next, as shown in FIG.7 (b), the 2nd sand delivery port 230b is opened by the 2nd switch 240b, and the sand 100 is fallen into the sand receiving part 250 from the 2nd sand injection | throwing-in part 210b. At this time, the sand 100 that has fallen by its own weight from the second sand throwing-in portion 210b to the sand receiving portion 250 is pressure-fed to the transport pipe 300 by the compressed air supplied from the sending blower 400 to the sand receiving portion 250.

(First sand input step)
As shown in FIG. 7C, while the sand 100 introduced into the second sand input part 210b is being pumped, the first sand transfer port 230a is closed by the first switch 240a. Sand 100 is thrown into the first sand throwing part 210a.

  When the sand 100 is thrown into the first sand throwing portion 210a, the first sand delivery port 230a is closed as described above. Thereby, even if compressed air is always supplied to the sand receiver 250 from the blower 400 for delivery, it is possible to suppress the compressed air from being ejected from the sand receiver 250 and to suppress the rising of the sand.

  Further, when the sand 100 is put into the first sand throwing portion 210a, the upper opening of the second sand throwing portion 210b during sand pressure feeding is closed by the lid 220. Thereby, it can suppress that compressed air blows out from the 2nd sand throwing-in part 210b, and can suppress that the sand 100 currently pumping in the 2nd sand throwing-in part 210b soars.

(Second closing step)
By looking at the inside of the second sand throwing portion 210b through the lid window portion of the lid 220, it is confirmed whether or not all the sand 100 thrown into the second sand throwing portion 210b has been pumped.

  And as shown in FIG.7 (d), if all the sand 100 thrown into the 2nd sand throwing-in part 210b is pumped, the 2nd switch 240b will close the 2nd sand delivery port 230b.

  The cycle from the first lid switching step to the second closing step is defined as one cycle, and this cycle is continuously repeated until all of the predetermined amount of sand 100 is pumped. Thereby, the sand 100 can be continuously pumped without stopping the operation of the blower 400 for delivery.

(4) Effects according to the present embodiment According to the present embodiment, the following one or more effects are achieved.

(A) The hopper 200 of the present embodiment includes at least two sand throwing portions (a first sand throwing portion 210a and a second sand throwing portion 210b). In the sand throwing step S210, the sand 100 is thrown alternately into the first sand throwing part 210a and the second sand throwing part 210b. Thereby, the sand 100 can be continuously pumped without stopping the operation of the blower 400 for delivery. As a result, the sand 100 taken out from the trough can be efficiently transported to the ground.

  Thus, since the sand 100 can be transported efficiently, the transport time of the sand 100 can be shortened. Further, in parallel with the operation of taking out the sand 100 from the trough, the discharging step S200 by the pressure feeding method can be performed. As a result, it is possible to shorten the entire work period including the work of removing the sand 100 from the trough. Further, since the transportation of the sand 100 is mechanized, it is possible to reduce the number of people for sand transportation. As a result, it is possible to reduce the cost for the entire work.

(B) In this embodiment, the sand in the trough of the sinus 92 is discharged to the ground by a pressure feeding method. Since the blower and the like can be downsized in the pressure feeding method, the sand transport device 10 can be easily installed in the narrow cave 92. Further, by adopting the pressure feeding method, the sand 100 having various particle diameters can be easily transported to the ground without clogging the transport pipe 300. Conventionally, the work of transporting the sand 100 in the trough can only be performed manually, and it has been difficult to mechanize, but by adopting the pressure feeding method as in this embodiment, It becomes possible to realize mechanization of work.

(C) In this embodiment, when the sand 100 is alternately put into the first sand throwing portion 210a and the second sand throwing portion 210b, the first sand transfer port 230a is closed by the first switch 240a. The sand 100 is thrown into the first sand throwing part 210a in the state where the sand is put, and the sand 100 is thrown into the second sand throwing part 210b while the second sand transfer port 230b is closed by the second switch 240b. . At this time, the compressed air is always supplied from the sending blower 400 to the sand receiving portion 250. However, the sand receiving portion 250 except for the pressure feeding direction is closed because the delivery port on the side where the sand 100 is introduced is closed. And sealed. As a result, it can suppress that compressed air blows out from the sand receiving part 250 side, and can suppress that the sand 100 soars.

(D) In the present embodiment, when sand is poured into the first sand throwing part 210a, the upper opening of the second sand throwing part 210b during sand pressure feeding is closed by the lid 220, and the second sand throwing part When throwing sand into 210b, the upper opening of the first sand throwing part 210a during sand pressure feeding is closed with a lid 220. Thus, when the sand is introduced into the first sand throwing part 210a or the second sand throwing part 210b, compressed air is ejected from the first sand throwing part 210a or the second sand throwing part 210b during the sand pressure feeding. It is possible to prevent the sand being pumped from rising.

(E) While the sand 100 thrown into the first sand throwing part 210a is being pumped, the sand 100 is thrown into the second sand throwing part 210b. On the other hand, the sand 100 is thrown into the first sand throwing portion 210a while the sand 100 thrown into the second sand throwing portion 210b is being pumped. And these processes are made into 1 cycle and this cycle is repeated continuously. Thereby, when alternately switching the sand throwing portions into which the sand 100 is thrown, it is not necessary to stop the operation of the sending blower 400, and it is possible to suppress the occurrence of a period during which the sand 100 is not pumped in the transport pipe 300. be able to. Or even if the period when the sand 100 is not pumped in the transport pipe 300 arises, the period can be shortened. As a result, the total transport time of the sand 100 can be shortened.

(F) In the carrying-in process S110, the hopper 200 is disassembled and carried into the sinus 92 from the ground through the opening 96 of the manhole 94. Then, in the assembly step S <b> 120 after the carry-in, the hopper 200 is assembled in the cave 92. Since the opening 96 of the manhole 94 is limited to a predetermined size, the hopper 200 can be easily carried into the sinus 92 through the opening 96 of the manhole 94 by disassembling the hopper 200.

  For reference, the conventional method and the method of this embodiment are compared. For example, in the case where the sand in the trough provided in the 500 m tunnel is manually removed as in the conventional method, it takes 10 days to remove the sand from the trough and pack it in a sandbag. The work of transporting the packed sandbags to the manhole took 7 days, and the work of unloading the sandbags to the ground by the hoist provided in the manhole took 5 days. Therefore, the total work period was approximately 22 days. The number of personnel required for each work was approximately 15 per day. On the other hand, when the operation of removing the sand in the trough provided in the same length of the cave is performed using the sand transport device 10 of the present embodiment, the operation of removing the sand from the trough is a manual operation. Therefore, it takes 10 days as in the conventional method, the preparation step S100 of the sand transport device 10 takes 4 days, and the discharge step S200 for discharging the sand 100 by the pressure feeding method using the sand transport device 10 takes 5 days. In the present embodiment, the work of taking out sand from the trough can be performed in parallel with the discharging step S200, and therefore the entire work period in this embodiment is less than about 19 days. Further, in this embodiment, the same number of personnel as in the conventional method is required in each of the operation of taking out sand from the trough and the discharging step S200, but the number of personnel necessary for the preparation step S100 of the sand transport device 10 is 1 Approximately 10 people per day. Thus, according to the present embodiment, the entire work period can be shortened, and the total number of personnel required for all work can be reduced.

<Second Embodiment of the Present Invention>
A second embodiment of the present invention will be described with reference to FIG. FIG. 8 is a schematic diagram showing the sand transport device according to the present embodiment.

  In the sand transport device 12 of the present embodiment, the arrangement of the hopper is different from that of the sand transport device 10 of the first embodiment. Hereinafter, only elements different from those of the first embodiment will be described, and elements substantially the same as those described in the first embodiment are denoted by the same reference numerals and description thereof will be omitted.

(1) Sand transport device As shown in FIG. 8, in the sand transport device 12 of the present embodiment, a plurality of hoppers 202 are provided at different positions in the length direction of the transport pipe 300. The plurality of hoppers 202 are provided apart from each other at a predetermined interval in the length direction of the transport pipe 300. The distance between the hoppers 202 is, for example, 10 m or more and 300 m or less. Thus, by providing a plurality of hoppers 202, the sand 100 can be discharged using a plurality of hoppers 202 simultaneously or sequentially.

  Each of the plurality of hoppers 202 includes at least two sand throwing portions as in the first embodiment. Thereby, each hopper 202 can throw sand 100 into two sand throwing portions alternately.

  Further, a sending blower 402 is connected to the upstream side of each hopper 202 so as to be attached to each hopper 202. Specifically, the sending blower 402 provided in the uppermost stream is similar to the sending blower 400 of the first embodiment, through a suction hose (not shown), and a sand receiving part (not shown) of the hopper 202. It is directly connected to the upstream side. On the other hand, a sending blower 402 provided at an intermediate position of the transport pipe 300 is connected to the sand receiving portion of the hopper 202 from the side of the hopper 202 via a nozzle (not shown). The nozzle is provided along the length direction (pumping direction) of the transport pipe 300, and the opening on the downstream side of the nozzle is directed to the downstream side of the transport pipe 300. Thus, compressed air can be supplied to the sand 100 supplied from the hopper 202 at the intermediate position of the transport pipe 300 without countering the flow of the sand 100 from the upstream hopper 202.

  Moreover, the relay part 600 may be provided in the transport pipe 300 between the pair of hoppers 202, and the relay blower 500 may be connected to the relay part 600.

(2) Sand transport method (S110: carry-in process)
First, as in the first embodiment, necessary equipment such as the hopper 202 is carried into the sinus 92 from the ground. At this time, each hopper 202 is disassembled and carried into the sinus 92 from the ground.

(S120: Assembly process)
Next, the plurality of hoppers 202 are arranged apart from each other at a predetermined interval in the length direction of the transport pipe 300, and the disassembled hoppers 202 are assembled. Next, the hopper 202, the sending blower 402, the relay unit 600, and the relay blower 500 are connected to the transport pipe 300, respectively. Thus, the sand transport device 12 is installed in the cave 92.

(S210: Sand input process)
Next, sand 100 in the trough is manually removed around each hopper 202. Each sand 100 taken out from the trough is transported to the nearest hopper 202. And sand 100 is thrown into a plurality of hoppers 202 simultaneously or in order. In each hopper 202, the sand 100 is thrown alternately into the two sand throwing portions.

(S220: Pressure feeding process)
Then, compressed air is supplied from the sending blower 402 connected to the hopper 202 to the sand 100 in the most upstream hopper 202, and to the sand 100 in the hopper 202 provided at an intermediate position of the transport pipe 300. In contrast, compressed air is supplied from a delivery blower 402 connected to the hopper 202. Thereby, the sand 100 put into any hopper 202 is stably pumped by the sending blower 402 connected to each hopper 202.

(3) Effects according to this embodiment In this embodiment, a plurality of hoppers 202 are installed at different positions in the length direction of the transport pipe 300, and sand is discharged using the plurality of hoppers 202 simultaneously or sequentially. Thereby, the sand 100 in the trough can be quickly discharged over the entire length of the cave 92 without moving the hopper 202.

  Moreover, in this embodiment, since the several hopper 202 is provided, the distance which carries the sand 100 picked out from the trough by hand to the nearest hopper 202 can be shortened. Therefore, inevitable manual work can be reduced, and the entire work period can be shortened.

<Other Embodiments of the Present Invention>
As mentioned above, although embodiment and modification of this invention were described concretely, this invention is not limited to the above-mentioned embodiment and modification, and can be variously changed in the range which does not deviate from the summary.

  In the above-described embodiment, the case where the first sand throwing portion 210a is located on the upstream side and the second sand throwing portion 210b is located on the downstream side has been described, but these arrangements may be reversed. Good.

  In the above-described embodiment, the case where the sand transport device 10 includes at least two sand input units (the first sand input unit 210a and the second sand input unit 210b) has been described. You may have two or more sand injection parts. However, if an excessive sand throwing portion is provided, the switching work becomes rather complicated, and therefore it is preferable that the number of sand throwing portions is two.

  In the above-described embodiment, the case where the hopper 200 is provided with one lid 220 and the lid 220 is configured to selectively close the upper opening of one of the two sand throwing portions has been described. However, the hopper may be provided with the same number of lids as the sand throwing portion.

  In the above-described embodiment, the case where the lid 220 includes the lid window portion has been described, but a window portion may be provided on the side surface of each sand throwing portion.

  In the above-described embodiment, the case where all of the compressed air supplied from the sending blower 400 is supplied to the hopper 200 has been described. However, a part of the compressed air supplied from the sending blower toward the hopper is used as the hopper. Alternatively, at least a part of the pipe may be bypassed and led to the downstream transport pipe. Specifically, for example, a bypass pipe may be provided so as to connect the upstream side of the sand receiving portion of the hopper and the transport pipe. Accordingly, even when sand clogging occurs temporarily in a part of the sand receiving portion of the hopper, it is possible to suppress the sand pressure from being interrupted and to continuously perform the sand pressure feeding. However, when the pumping is disadvantageous due to the bypass pipe, the bypass pipe should not be provided.

  In the above-described embodiment, the case where the relay blower 500 is provided at a position between the hopper 200 and the ground in the transport pipe 300 has been described, but the distance of the cave is short or the transmission blower is When the output is large, the relay blower may not be provided.

  In the above-described embodiment, the case where the relay blower 500 is provided only in the cave 92 has been described. However, when the depth from the ground to the cave is deep, the transport pipe stands vertically upward in the manhole. A relay blower may be provided in the raised portion.

  In the above-described embodiment, the case where the sand 100 starts to be fed from the first sand thrower 210a in the sand throwing step S210 has been described. However, any sand thrower may start to throw sand, for example, the second sand thrower 210a. Sand may be started from the sand input portion.

  In the above-described embodiment, after the predetermined amount of sand 100 is pumped by the discharging step S200, the joint 320 is removed, and the hopper 200 and the delivery blower 400 are connected to the part from which the joint 320 has been removed. The case where the hopper moving process for shortening the overall length is performed, the discharging process S200 and the hopper moving process are repeated, and the positions of the hopper 200 and the sending blower 400 are gradually brought closer to the manhole 94 has been described. After pressure-feeding the sand, remove the joint, add a new transport pipe to the part where the joint was removed, and connect it to perform a hopper moving process that lengthens the entire length of the transport pipe, discharging process and hopper moving process And the positions of the hopper and the sending blower may be gradually moved away from the manhole.

  In the second embodiment described above, the case where the sending blower 402 is provided so as to be attached to the hopper 202 has been described. However, the output of the most upstream sending blower is large, or a sufficient number of relays are used. When the blower is provided, the sending blower may not be provided adjacent to the hopper.

<Preferred embodiment of the present invention>
Hereinafter, preferred embodiments of the present invention will be additionally described.

(Appendix 1)
According to one aspect of the invention,
A sand transport method for transporting sand laid in a trough provided in a tunnel in the ground to the ground,
A preparation process for installing necessary equipment in the cave;
A discharge step of discharging the sand in the trough to the ground by a pressure feeding method,
The discharging step is
A sand loading step of loading sand taken out from the trough into a hopper;
A pumping step of pumping the sand thrown into the hopper to the ground,
In the sand charging process,
A sand transport method is provided in which at least two sand throwing portions are provided in the hopper, and sand is alternately thrown into the two sand throwing portions.

(Appendix 2)
The sand transport method according to appendix 1, preferably,
The hopper
Sand received in each of the two sand input portions by its own weight falling, and a sand receiving portion constituting a part of a flow path for pressure-feeding the sand;
A first switch for opening and closing a first sand transfer port between the first sand input portion of the two sand input portions and the sand receiving portion;
A second switch for opening and closing a second sand transfer port between the second sand input portion of the two sand input portions and the sand receiving portion;
In the sand charging process,
When sand is alternately poured into the first sand throwing section and the second sand throwing section, the first sand is closed with the first sand transfer port closed by the first switch. Sand is poured into the throwing section, and sand is poured into the second sand throwing section in a state where the second sand transfer port is closed by the second switch.

(Appendix 3)
The sand transport method according to appendix 2, preferably,
The hopper includes a lid that can selectively close an upper opening of each of the two sand throwing portions,
In the sand charging process,
When sand is poured into the first sand throwing portion, the upper opening of the second sand throwing portion is closed with the lid, and when sand is thrown into the second sand throwing portion, the first sand. The upper opening of the charging part is closed with the lid.

(Appendix 4)
The sand transport method according to appendix 2 or 3, preferably,
The sand charging step includes
A step of closing an upper opening of the first sand throwing portion with the lid in a state where sand is thrown into the first sand throwing portion;
Opening the first sand transfer port by the first switch, and dropping the sand by its own weight from the first sand throwing portion to the sand receiving portion;
While the sand thrown into the first sand throwing section is being pumped, the second switch is used to throw sand into the second sand throwing section with the second sand delivery port closed. Process,
When all the sand thrown into the first sand throwing portion is pumped, the step of closing the first sand delivery port by the first switch;
A step of closing an upper opening of the second sand throwing portion with the lid in a state where sand is thrown into the second sand throwing portion;
Opening the second sand delivery port by the second switch, and dropping the sand by its own weight from the second sand throwing portion to the sand receiving portion;
While the sand thrown into the second sand throwing section is being pumped, the first switch is used to throw sand into the first sand throwing section with the first sand transfer port closed. Process,
A step of closing the second sand transfer port by the second switch, when all of the sand thrown into the second sand input unit is pumped;
Is set as one cycle, and this cycle is repeated.

(Appendix 5)
The sand transport method according to any one of appendices 1 to 4, preferably,
The preparation step includes
A carrying-in process for carrying in the cave from the ground with the hopper disassembled;
And an assembling step of assembling the hopper in the sinus after the loading.

(Appendix 6)
The sand transport method according to any one of appendices 1 to 5, preferably,
In the pumping process,
By supplying compressed air to the sand in the hopper from the blower for delivery, the sand is pumped through the transport pipe, and further compressed air is supplied to the sand in the transport pipe from the relay blower. Promotes the flow of sand in the transport pipe.

(Appendix 7)
The sand transport method according to any one of appendices 1 to 6, preferably,
In the pumping process,
The relay blower is provided with a window at the relay part connected to the transport pipe, and the sand flow is confirmed through the window part.

(Appendix 8)
The sand transport method according to any one of appendices 1 to 7, preferably,
In the pumping step, sand is pumped by a blower through a transport pipe,
After pumping a predetermined amount of sand by the discharging step, the joint connecting the pair of transport pipes is removed, and the hopper and the blower are connected to the part from which the joints are removed, thereby shortening the overall length of the transport pipe. The process of carrying out.

(Appendix 9)
The sand transport method according to any one of appendices 1 to 7, preferably,
In the pumping step, sand is pumped by a blower through a transport pipe,
After pressure-feeding a predetermined amount of sand by the discharging step, the joint that connects the pair of transport pipes is removed, and the transport pipe is newly added and connected to the part from which the joints have been removed. A step of increasing the overall length.

(Appendix 10)
The sand transport method according to any one of appendices 1 to 9, preferably,
In the preparation step, a plurality of hoppers are installed at different positions in the length direction of the transport pipe,
In the discharging step, the sand is discharged using the plurality of hoppers simultaneously or sequentially.

(Appendix 11)
According to another aspect of the invention,
A sand transport device for transporting sand laid in a trough provided in a tunnel in the ground to the ground,
A hopper into which sand taken out from the trough is charged;
A blower for pumping sand thrown into the hopper to the ground;
A transport pipe that constitutes a flow path of sand pumped from the hopper,
The hopper has at least two sand throwing portions, and a sand transport device configured to alternately throw sand into the two sand throwing portions is provided.

(Appendix 12)
According to yet another aspect of the invention,
A hopper used in a sand transport device for transporting sand laid in a trough provided in an underground tunnel to the ground,
At least two sand input portions into which sand taken out from the trough is input;
Sand received in each of the two sand input portions by its own weight falling, and a sand receiving portion constituting a part of a flow path for pressure-feeding the sand;
A first switch for opening and closing a first sand transfer port between the first sand input portion of the two sand input portions and the sand receiving portion;
A second switch for opening and closing a second sand transfer port between the second sand input portion of the two sand input portions and the sand receiving portion;
There is provided a hopper provided with a lid capable of selectively closing an upper opening of each of the two sand throwing portions.

10, 12 Sand transport device 92 Cave 94 Manhole 96 Opening 100 Sand 200, 202 Hopper 210a First sand throwing part 210b Second sand throwing part 220 Lid 222 Hinge 224a, 224b Bolt 230a First sand delivery port 230b First 2nd sand delivery port 240a 1st switch 240b 2nd switch 242a 1st switch plate 242b 2nd switch plate 244a 1st hydraulic cylinder 244b 2nd hydraulic cylinder 250 Sand receiving part 260a, 260b Support part 270 Guide section 280a First vibrator 280b Second vibrator 300 Transport pipe 320 Joint 330 Adhesive 340 Bolt 360 Tape 400, 402 Blower for delivery 420 Suction hose 500 Blower for relay 520 Suction hose 540 Nozzle 600 Relay section 610 Socket 61 Bolt 614 tape 620 adapter 630 window 640 manometer 650 socket 660 connection pipe 670 coupling 672 volts 674 tape 800 dump truck

Claims (9)

A sand transport method for transporting sand laid in a trough provided in a tunnel in the ground to the ground,
A preparation process for installing necessary equipment in the cave;
A discharge step of discharging the sand in the trough to the ground by a pressure feeding method,
The discharging step is
A sand loading step of loading sand taken out from the trough into a hopper;
A pumping step of pumping the sand thrown into the hopper to the ground,
In the sand charging process,
A sand transport method in which at least two sand input portions are provided in the hopper, and sand is alternately input into the two sand input portions. The hopper
Sand received in each of the two sand input portions by its own weight falling, and a sand receiving portion constituting a part of a flow path for pressure-feeding the sand;
A first switch for opening and closing a first sand transfer port between the first sand input portion of the two sand input portions and the sand receiving portion;
A second switch for opening and closing a second sand transfer port between the second sand input portion of the two sand input portions and the sand receiving portion;
In the sand charging process,
When sand is alternately poured into the first sand throwing section and the second sand throwing section, the first sand is closed with the first sand transfer port closed by the first switch. The sand transport method according to claim 1, wherein sand is poured into the charging unit, and sand is poured into the second sand charging unit in a state where the second sand transfer port is closed by the second switch. The hopper includes a lid that can selectively close an upper opening of each of the two sand throwing portions,
In the sand charging process,
When sand is poured into the first sand throwing portion, the upper opening of the second sand throwing portion is closed with the lid, and when sand is thrown into the second sand throwing portion, the first sand. The sand transport method according to claim 2, wherein an upper opening of the charging portion is closed with the lid. The sand charging step includes
A step of closing an upper opening of the first sand throwing portion with the lid in a state where sand is thrown into the first sand throwing portion;
Opening the first sand transfer port by the first switch, and dropping the sand by its own weight from the first sand throwing portion to the sand receiving portion;
While the sand thrown into the first sand throwing section is being pumped, the second switch is used to throw sand into the second sand throwing section with the second sand delivery port closed. Process,
When all the sand thrown into the first sand throwing portion is pumped, the step of closing the first sand delivery port by the first switch;
A step of closing an upper opening of the second sand throwing portion with the lid in a state where sand is thrown into the second sand throwing portion;
Opening the second sand delivery port by the second switch, and dropping the sand by its own weight from the second sand throwing portion to the sand receiving portion;
While the sand thrown into the second sand throwing section is being pumped, the first switch is used to throw sand into the first sand throwing section with the first sand transfer port closed. Process,
A step of closing the second sand transfer port by the second switch, when all of the sand thrown into the second sand input unit is pumped;
The sand transport method according to claim 2 or 3, wherein the cycle is repeated as one cycle. The preparation step includes
A carrying-in process for carrying in the cave from the ground with the hopper disassembled;
The sand transportation method according to any one of claims 1 to 4, further comprising an assembling step of assembling the hopper in the sinus after the carry-in. In the pumping process,
By supplying compressed air to the sand in the hopper from the blower for delivery, the sand is pumped through the transport pipe, and further compressed air is supplied to the sand in the transport pipe from the relay blower. The sand transport method according to claim 1, wherein the sand flow in the transport pipe is promoted. In the preparation step, a plurality of hoppers are installed at different positions in the length direction of the transport pipe,
The sand transport method according to any one of claims 1 to 6, wherein in the discharging step, sand is discharged using the plurality of hoppers simultaneously or sequentially. A sand transport device for transporting sand laid in a trough provided in a tunnel in the ground to the ground,
A hopper into which sand taken out from the trough is charged;
A blower for pumping sand thrown into the hopper to the ground;
A transport pipe that constitutes a flow path of sand pumped from the hopper,
The hopper has at least two sand throwing portions, and is configured to be configured so that sand is alternately thrown into the two sand throwing portions. A hopper used in a sand transport device for transporting sand laid in a trough provided in an underground tunnel to the ground,
At least two sand input portions into which sand taken out from the trough is input;
Sand received in each of the two sand input portions by its own weight falling, and a sand receiving portion constituting a part of a flow path for pressure-feeding the sand;
A first switch for opening and closing a first sand transfer port between the first sand input portion of the two sand input portions and the sand receiving portion;
A second switch for opening and closing a second sand transfer port between the second sand input portion of the two sand input portions and the sand receiving portion;
A hopper comprising: a lid capable of selectively closing an upper opening of each of the two sand throwing portions.

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