JP2000184515A - Sediment discharge installation equipped with linear motor driven elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain sediment discharge installation equipped with a linear motor driven elevator. SOLUTION: Waste mud 1 is loaded in a transportation case 15, in a tunnel 24 in the bottom part of a shaft 3, and mounted on a transportation truck 9. The truck 9 loaded with the waste mud ascends in a guide way 17A by a linear motor 6, and stops at ground part transfer equipment 18 on the guide way uppermost story. The transportation case 15 is taken out form the truck 9 to the outside of the guide way 7A, can carried to discharging equipment 21. The waste mud is discharged from the transportation case 15, and carried to a mud yard 2 by a conveyer 20. The truck 9 which unloads the case 15 is carried to a guide way 7B for descending by a conveyer 22, takes on an empty transportation case 15B, and descends in the guide way 7B as far as the tunnel 24 under the ground. Thus, circulation type sediment discharge installation is constituted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sediment discharging facility having a linear motor type elevator for discharging earth and sand excavated underground to the ground.

[0002]

2. Description of the Related Art As a method of discharging excavated soil by tunnel excavation performed underground to the ground, the following method has been conventionally performed. 1) Discharge method using muddy water by the muddy water shield method (hereinafter referred to as "prior art 1"). 2) A method of discharging soil into a shaft by a wire-type elevator (hereinafter referred to as "prior art 2"). 3) Driving truck type earthing method, where the gears are meshed with gears such as racks and pinions and discharged out of the vertical shaft
"Prior art 3"). 4) A method in which a spiral rail is attached to the inner wall of a shaft and the soil is discharged onto a self-propelled bogie that runs on the rail (hereinafter, referred to as a trolley).
"Prior art 4"). 5) A transport method using a wireless linear elevator using superconducting permanent magnets (hereinafter, referred to as “prior art 5”).

[0003]

However, the prior art has the following problems as the depth increases and the amount of earth removal increases due to tunnel excavation using a seal or the like. 1) In the method of discharging soil using muddy water of the prior art 1, a depth of 10
If it exceeds m, a vacuum area is created and transportation becomes unstable,
Mud water supply required measures such as installing a pump about every 10 m. Therefore, as the volume and depth increase, transportation becomes more difficult. In addition, when the soil is discharged together with the muddy water, a high-pressure pump is required, and it becomes difficult to maintain and control the cutting edge surface. Therefore, the earth removal method using the muddy water method was difficult. 2) Unloading by the wire type elevator of prior art 2
As the depth increases, the weight of the wire itself increases, and the power itself and the strength of the wire itself cannot be tolerated. 3) In the case of discharging the soil to the ground by the method using the traveling trolley according to the prior art 3, there is a discharging method in which the gears such as racks are meshed and the entire trolley is raised. However, the speed cannot be increased and the discharge amount increases. could not. 4) In the case of transporting the carriage by the spiral route of the prior art 4, the speed does not increase due to the spiral traveling, and it takes time. Also, because the wheels of the bogie slip, the inclination angle cannot be increased,
There were problems such as restrictions on the amount of transportation and an increase in equipment. 5) In the superconducting wireless elevator according to Prior Art 5, it is difficult to maintain the temperature of the superconducting magnet for a long time, and there is a problem such as dropping when a quench phenomenon occurs, and the application is difficult due to lack of stability.

[0004] Accordingly, an object of the present invention is to solve the above-mentioned problems, and to provide a sediment discharging facility equipped with a linear elevator for discharging sediment capable of driving a plurality of vehicles and enabling efficient sediment transport. Is to do.

[0005]

According to the first aspect of the present invention,
A guideway having a rectangular cross section composed of an outward path and a return path, which is provided vertically in a vertical shaft between the ground and the basement, and is attached at predetermined intervals in a longitudinal direction of the guideway on a plurality of inner surfaces of the guideway. An excitation coil capable of changing polarity, a plurality of transport vehicles that move in the guideway with earth removed thereon, a multipolar permanent magnet mounted on an outer surface of the transport vehicle, and the excitation coil A synchronous linear motor type elevator configured with a sensor for detecting the position of the permanent magnet of the transport trolley attached to each position of the transport trolley, and a loading device for loading the excavated soil into the transport trolley A transfer device for transferring the transport vehicle from the outward route to the return route of the guideway in the underground, and discharging the soil conveyed from underground by the transport vehicle to the ground. And unloading device for unloading from Oite the transport carriage, is the transport carriage in the ground having a characteristic to be composed of a transferring apparatus for effecting instead take the outward from the return path of the guideway.

The invention according to claim 2 is characterized in that the guideway is further divided into a plurality of zones and a plurality of sections in the zones.

According to a third aspect of the present invention, in order to smooth the thrust acting on the transport trolley and stabilize traveling, the mounting position of the exciting coil is set between the plurality of surfaces inside the guideway. The mounting positions of the permanent magnets are arranged so as to be shifted from each other by a predetermined distance in the running direction of the transport trolley or between the respective outer surfaces of the transport trolley. It is characterized by being performed.

According to a fourth aspect of the present invention, the guideway is provided with an emergency avoidance device for the transport trolley, and the emergency avoidance device comprises a stopper that can project into the guideway and is made to protrude. The transport carriage can be placed on the stopper and can be removed from the guideway.

[0009]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a front view showing the overall configuration of a discharging facility according to an embodiment of the present invention, FIG. 2 is a front view showing a discharging section of a hopper underground, and FIG. 3 is a guide. Front view showing the traveling situation of the transport trolley in the way,
FIG. 4 is a horizontal cross-sectional view of a guideway, FIG. 5 is a wiring diagram showing a configuration of an excitation coil of one section, FIG. 6 is an explanatory view of a driving method of a transport trolley, and FIG. 7 is driving in a plurality of zones. FIG. 8 is a perspective view showing an emergency avoidance device.

The present invention is a sediment discharging facility using a linear elevator in which a transport vehicle for transporting and discharging a large amount of soil generated when excavating a tunnel underground is moved up and down in a guideway.

As shown in FIGS. 1 and 2, a shaft 3 for excavation of a tunnel 24 provided vertically in the ground has a rectangular cross section (substantially square, see FIG. 4) incorporating a linear motor. Square guideway 7 (7A, 7B, see FIG. 1)
Are provided vertically in a cylindrical shape. Guideways 7A, 7
In the middle of B, a plurality of stages 8 (8A to 8
F, see FIG. 1). In the guideway 7, a plurality of box-shaped transport carts 9 (9A to 9I, see FIG. 1) each having a plurality of traveling rollers 4 and capable of traveling up and down along the guideway 7 by a linear motor are arranged. It constitutes a linear elevator. Guideway 7 is 7A
Is for the forward path (up), and 7B is for the return path (down).

As shown in FIG. 3, a plurality of elliptical (see FIG. 5) exciting coils 25 are arranged at equal pitches (P: pitches of the exciting coils) in a longitudinal direction (high) on a plurality of inner surfaces of the guideway 7. In the same direction). Excitation coil 2
The sensor 27 is attached to the center position of each of the sensors 5 (see FIG. 5).

A plurality of side surfaces of the transport carriage 9 are provided with a predetermined width of 5 mm.
The pole permanent magnets 26 are mounted one above the other at a predetermined distance from each other (see FIGS. 2 and 3). A thrust equal to the number of permanent magnets 26 is obtained on the transport carriage 9 by the synchronous linear motor with the excitation coil 25. By providing a synchronous linear motor composed of a plurality of permanent magnets and an exciting coil attached to a guideway, wireless communication can be achieved. Further, the sensor 27 may have a configuration in which a plurality of systems are mounted for safety such as failure.

The mounting position of the exciting coil of the linear motor is determined between the plurality of inner surfaces of the guideway.
By shifting each other by P / (number of magnet poles × number of surfaces), the valley of the thrust (ripple) of the thrust of the linear motor can be complemented, and the thrust can be smoothed. The same effect can be obtained by displacing the mounting positions of the plural-pole permanent magnets between the respective outer surfaces of the plurality of transport vehicles in the same manner as described above.

Further, by using a high magnetic material for the backside fixed plate of the permanent magnet and the backside fixed plate of the exciting coil, the permeability effect is increased, the driving efficiency is improved, and the configuration of the linear motor can be simplified. Costs can be reduced.

Next, the arrangement of the permanent magnets 26 and the exciting coils 25 of the transport trolley 9 for carrying loads will be described. As shown in FIG. 2 and FIG. 4, the transporting trolley 9 includes a plurality of rollers 4 provided at four locations above and below the transporting trolley 9.
The vehicle travels while contacting the ground with a contact surface 71 provided at a corner of the vehicle.

As shown in FIG. 4, ascending guideway 7A
Excitation coils 25 are attached to the four inner surfaces of the. Exciting coils 25 having a plurality of poles are attached to two opposing surfaces inside the descending guideway 7B. On the other hand, permanent magnets 26 are attached to the four outer surfaces of the transport cart 9.

As described above, since the thrust can be exerted from the four surfaces of the guideway and the transport trolley, a large thrust can be obtained, and the vertical force generated between the permanent magnet and the exciting coil can be balanced. The mounting surfaces and the numbers of the exciting coils and the permanent magnets are not limited to the above.

Further, by driving the linear motor for each face of the guideway, the thrust can be increased or decreased according to the number of driving linear motors for each required thrust, so that the cost can be reduced and even if one linear motor fails, half Since the thrust can be secured, falling can be prevented.

As shown in FIGS. 4 and 7, a stage 8 provided in the shaft 3 is provided with a linear drive device 30. Reference numeral 10 denotes a stair provided on the stage.

As shown in FIGS. 1 and 2, the bottom of the shaft 3
In the tunnel 24, an unloading loading device 5 is provided. The loading device 5 includes a conveyor 17 and a crusher 1
1, a conveyor 12, a hopper 13, a conveyor 14, and the like.

On the other hand, at the top of the shaft 3
A transfer device (hereinafter referred to as a “ground transfer device”) 18 is provided, and a conveyor 19, a discharge device 21, a conveyor 20, a storage place 20, and the like for discharging excavated earth are provided. I have.

Next, the emergency avoidance device will be described. As shown in FIG. 8, each stage 8 is provided with an emergency avoidance device 29 having an emergency stop and removal function of the transport trolley. Both sides 31A and 31 of guideway 7
B has a receiving roller 32 supported on a rotatable leg 32a whose base is pivoted by a pivoting portion.
It is provided so that it may protrude inside. When the receiving roller 32 is rotated to be horizontal and protrudes into the guideway 7, the stopper (receiving frame) 34 is horizontally protruded from the stage 8 while moving on the receiving roller 32 by a hydraulic cylinder (not shown). It has become. Receiving frame 34
A damper 33 for receiving the transport vehicle 9 is provided on the upper surface of the vehicle.

When an abnormality occurs in the equipment due to a failure of the transport trolley 9, the emergency avoidance device 29 is operated on the stage 8 immediately below the transport trolley 9. That is, the transport trolley 9 is stopped slightly above the emergency avoidance device 29, the receiving frame 34 (the receiving roller 32) is projected into the guideway 7, and then the stopped transport trolley 9 is lowered to hit the damper 33. And stopped by the receiving frame 34.
And it is made to wait here. When a failure has occurred in the transport trolley 9, the receiving frame 34 can be moved to the stage 8 outside the guideway 7 while the transport trolley 9 is kept on standby on the frame 34. The removed transport cart 9 is repaired on the stage 8 and returned to the line. Alternatively, it can be repaired after being taken out of the stage with a crane or the like. As a result, transport restart and repair can be easily and quickly performed. Further, by taking out the transport trolley from the guideway, the present invention can be applied to overtaking other transport trolleys.

When the operation of the transport carriage 9 on the receiving frame 34 is to be resumed, the transport carriage 9 rises as it rises, and when it descends, the transport carriage 9 is once raised and the receiving frame 3
After storing the transport carts 4, the transport carts 9 are sequentially started to descend. As described above, the operation can be easily restarted.

Next, a description will be given of the driving of the transport trolley by the linear motor in the linear elevator.

As shown in FIG. 5, a plurality of power supply lines 36 from the linear drive unit 30 are connected in parallel through a power supply switch 37 for each section 35. Wiring 38
Are connected in series for each of the three phases, and are configured as star connections connecting terminals. The number of exciting coils 25 in one section 35 is constituted by an integral multiple of a plurality of phases × 2,
The excitation coil 25 and the sensor 27 corresponding to the phase are connected in series. 27A and 27B are section sensors.

The signals of the sensor 27 corresponding to the three phases are serially transmitted to the linear drive device 30 through the amplifier circuit 39. Further, by connecting this signal to the OR circuit 40, the detection can be continued as long as the transport carriage 9 is present in the section 35. The signal from the sensor 27 turns on the switch 37 of the three-phase power supply, and continues to transmit the signal addressed to each section 35 to the linear drive device 30.
As a result, current can be passed only to the section 35 where the transport trolley 9 is located, and a position signal of the transport trolley 9 is sent so that its position can be known.

As shown in FIG. 6, eight types of detection are performed by a multi-pole permanent magnet 26 attached to the transport trolley 9 and a sensor 27 attached at the center position of the exciting coil 25 attached to the guideway 7. The pattern 42 is formed. The detection pattern 42 allows a current to flow so that a thrust in a certain direction acts on the exciting coil 25. FIG. 6 shows the flow (output pattern 48). When the magnetic flux flows through the exciting coil 25, a thrust acts on the exciting coil 25 according to Fleming's left-hand rule. Permanent magnet 26
The reaction force acts on the (transportation trolley 9) side, and it is possible to pattern which excitation coil 25 is to be supplied with current and in which direction the thrust is to be exerted by the detection method of the sensor 27. it can. In addition, the two permanent magnets 26 attached to one transporting trolley 9 are attached while being shifted by 3 / (the number of attachment surfaces × the number of magnet poles), so that synchronized thrust can be produced in the same direction, and the attached permanent magnets 26 Thrust is obtained. The thrust of the transport trolley can be adjusted by the number of permanent magnets and excitation coils attached to the guideway, so that the cost can be easily reduced. Since the driving of the linear motor is patterned with respect to the sensor to determine the direction and the series connection is performed for each phase, the number of sensors and the number of lines can be reduced.

As shown in FIG. 7, the guideway 7 is divided into a plurality of zones 43. The linear driving device 30 is connected to each zone 43. Further, the zone 43 is divided into the plurality of sections 35 described above. Also,
The plurality of linear driving devices 30 are connected to a distributed controller 44 and a general control panel 45, are controlled by the distributed controller 44, and are entirely controlled by an integrated control panel 45. By using the section system and the zone system for the linear motor, it is possible to realize a longer line and a reduced power.

Here, two linear drive units 30 are provided in one zone 43, and the drive units 30 are provided in each section 35.
The power can be miniaturized by connecting. In addition, at the time of transfer to another section 35, fluctuation in thrust can be eliminated. The signal of the sensor 27 is input to the linear drive device 30, the distributed control device 44, and the general control panel 45, respectively. As described above, in the zone 43, the excitation coil 25, the sensor 27, and the linear drive device 30 are independent of each other, so that one transport vehicle 9 can be drive-controlled in each zone 43.

As shown in FIG. 7, the sensors 27 provided at a predetermined pitch are arranged at the pitch so as to extend to the outside of each section 35 by a predetermined length, for example, a magnet length. The extension of this sensor and the adjacent zone 43
And the extension of the section 35 and the sensor 2
Seven overlapping areas 47 are provided. Specifically, the sensor 27A in the zone 43A and the sensor 27B in the zone 43B shown in FIG. 7 are provided so as to overlap in the overlapping area 47A. With such a configuration, when the transporting trolley 9 transfers from the zone 43A or the section 35 to the next zone 43B or the section 35, the sensors 27A and 27
The detection pattern 42 for the transport trolley 9 at the time of transiting to an adjacent zone or section by the overlapping area 47A with B
(See FIG. 6) is output normally, so that the output of the thrust is stabilized and the traveling is smooth.

The same applies to the case where the vehicle passes through the zone 43B or the section 35, and the overlap area 47B between the sensor 27A of the zone 43B and the section 35 and the sensor 27B of the next zone 43C and the section 35 (see FIG. 7). Since the detection pattern 42 (see FIG. 6) until the transport vehicle 9 exits the next zone 43 and the section 35 is output normally, the output of the thrust is stabilized and the traveling is smooth.

The guideway incorporating the linear motor can be manufactured at a factory or the like at a place other than the site where the earth and sand is discharged, and the line can be extended simply by connecting the site, so that the position of the connecting portion can be easily adjusted, Cost can be reduced.

Next, the discharge of earth and sand by the equipment shown in FIGS. 1 to 7 will be described.

As shown in FIGS. 1 and 2, earth and sand discharged from an excavator (not shown) in the tunnel 24 at the bottom of the shaft 3 and carried by the conveyor 17 (hereinafter referred to as "discharge"). 1 is charged into a crusher 11,
Is crushed into a shape having a predetermined size or less, and is put into the hopper 13 by the conveyor 12.

An empty transport case 15 is carried by the conveyor 14 from the guideway 7 to below the hopper 13. The openable bottom cover 16 of the hopper 13 is opened, and the earth discharging 1 is loaded into the transported transport case 15. Next, the transport case 15 loaded with the earth is moved by the conveyor 14 to the ascending guideway 7A, where the transport case 15 is placed on the transport cart 9.

The transport trolley 9 on which the transport case 15 on which the earth is discharged is loaded rises in the guideway 7A by the linear motor 6, and stops at the top-level transfer device 18 on the top floor of the guideway. And here, transport case 1
5 is taken out of the guideway 7A and the conveyor 19
The soil is discharged from the transport case 15 by the discharge device 21, the soil is dropped onto the conveyor 20, and is transported to the storage site 2 by the conveyor 20.

The transport trolley 9 from which the transport case 15 has been lowered is transported by the conveyor 22 to the lower guideway 7B.
, Where the empty transport case 15 carried by the conveyor 23 is placed, and then descends in the guideway 7B to the underground tunnel 24. Tunnel 2
4, the empty transport case 15B is removed from the conveyor 14
Transfer to

By repeating the above, a series of circulation-type earth discharging and transporting operations are performed.

The driving source of the transport vehicle is a synchronous linear motor composed of a plurality of pole permanent magnets mounted on the transport vehicle and an exciting coil mounted on the guideway, so that the thrust is stable and in case of failure. However, by short-circuiting the power supply line by a transistor or the like, the regenerative brake can be easily used and a sharp drop can be prevented.

[0043]

As described above, according to the present invention, the following useful effects can be obtained. 1) A synchronous linear motor is composed of a multi-pole permanent magnet mounted on a transport trolley and an excitation coil mounted on a guideway. By using a linear motor type elevator capable of discharging and using a recirculation type that switches between an outgoing route and a returning route and returns, a large amount of soil can be transported, and the efficiency of the soil discharging process can be improved. 2) Since the vehicle is divided into sections and zones, it is possible to reduce the transportation power, increase the transportation volume by traveling a plurality of transportation vehicles, and extend the traveling line. 3) A large thrust can be obtained because thrust can be exerted in the vertical direction from a plurality of surfaces of the guideway and the transport vehicle, and the vertical force generated between the permanent magnet and the exciting coil can be balanced, and the transport vehicle can travel reliably. Is obtained. 4) By offsetting the mounting positions of the exciting coils or the permanent magnets of the plurality of linear motors from each other, the valleys of the peaks (ripples) of the thrust of the linear motors are complemented with each other,
The thrust can be smoothed, and the transport vehicle can travel smoothly. 5) Since an emergency avoidance device for the transport trolley is provided for each stage, it is possible to quickly respond to an abnormality or a failure of the transport trolley, and there is no stop or stagnation of the discharging operation of the equipment.

[Brief description of the drawings]

FIG. 1 is a front view showing an entire configuration of a transportation facility for discharging soil according to an embodiment of the present invention.

FIG. 2 is a front view showing a dumping loading section of a hopper of the dumping transport equipment according to the embodiment of the present invention.

FIG. 3 is a front view showing a traveling state of the transport trolley in the guideway according to the embodiment of the present invention.

FIG. 4 is a horizontal cross-sectional view of the guideway according to the embodiment of the present invention.

FIG. 5 is a wiring diagram showing a configuration of an excitation coil of one section according to the embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a driving method according to the embodiment of the present invention.

FIG. 7 is a drive control system diagram in a plurality of zones according to the embodiment of the present invention.

FIG. 8 is a perspective view showing an emergency avoidance device according to the embodiment of the present invention.

[Explanation of symbols]

 1: soil removal (soil and sand) 2: storage yard 3: vertical shaft 4: traveling roller of transport trolley 5: loading device 6: linear motor 7: guideway 7A: ascending guideway 7B: descending guideway 71 : Grounding surface 8,8A-8F: Stage 9,9A-9I: Transportation trolley 10: Stairs 11: Crusher 12: Conveyor 13: Hopper 14: Conveyor 15: Transport case 16: Bottom cover 17: Conveyer 18: Transfer to ground Loading device 19: Conveyor 20: Conveyor 21: Discharge device 22: Conveyor 23: Conveyor 24: Underground tunnel 25: Exciting coil 26: Permanent magnet 27, 27A, 27B: Sensor 27A: Section sensor 29 Emergency avoidance device 30: Linear drive device 31A, 31B: Both sides of the guideway 32 Receiving roller 33 Damper 34 Stopper (receiving frame) 35 Section 36: Power line 37: Power switch 38: Wiring 39: Amplifier circuit 40: OR circuit 41: Three-phase power supply 42: Detection pattern 43, 43A, 43B, 43C: Zone 44: Distributed controller 45: Integrated control panel 46 : Operation panel 47A, 47B: Overlap area 48: Output pattern

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B60L 13/02 Q (72) Inventor Yuji Fujisawa 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Steel Pipe Co., Ltd. (72) Inventor Hitoshi Ishizuka 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Hisashi Takenaka 1-2-3 Shibaura, Minato-ku, Tokyo Shivans Building Shimizu Corporation Inside the company (72) Inventor Yoshiyuki Ohara 1-2-3 Shibaura, Minato-ku, Tokyo Seavans S Building Shimizu Corporation (72) Inventor Naoya Sugawara 1-2-3 Shibaura, Minato-ku, Tokyo Seavans S Building Shimizu Corporation In-house (72) Inventor Toshiyuki Namioka 88 Ono-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Japan F-term (reference) 2D054 DA24 3F301 AA03 BA 16 BC00 BE02 DC03 DC08 5H113 AA05 AA08 BB01 BB08 CC04 CD02 CD06 CD13 CD16 DD01 DD07 GG02 HH27 HH29

Claims (4)

[Claims] 1. A guideway vertically provided in a vertical shaft between the ground and the basement and having a rectangular cross section including an outward route and a return route, and a longitudinal direction of the guideway on a plurality of inner surfaces of the guideway. Installed at predetermined intervals,
An excitation coil capable of converting polarity, a plurality of transport vehicles that move in the guideway with earth removed thereon, a multipolar permanent magnet attached to the outer surface of the transport vehicle, and a position for each of the excitation coils. A synchronous linear motor type elevator configured by a sensor for detecting a position of a permanent magnet of the transport trolley, a loading device for loading excavated soil into the transport trolley, and A transfer device for transferring the transport vehicle from an outbound route to a return route of the guideway, a loading / unloading device for unloading the soil conveyed from underground by the transport vehicle on the ground from the transport vehicle, and A transfer device for transferring the transport vehicle from the return route to the forward route of the guideway. Sediment discharge installation comprising a base over data. 2. The earth and sand discharge facility according to claim 1, wherein the guideway is further divided into a plurality of zones and a plurality of sections in the zones. 3. The mounting position of the exciting coil between the respective surfaces of the plurality of surfaces inside the guideway in order to make the thrust acting on the transport vehicle smoother and stabilize the traveling direction. The mounting positions of the permanent magnets are shifted from each other by a predetermined distance in the traveling direction of the transport trolley between the respective outer surfaces of the transport trolley. Or the earth and sand discharge facility according to 2. 4. The guideway is provided with an emergency avoidance device for the transport trolley, wherein the emergency avoidance device comprises a stopper that can protrude into the guideway, and the transportation device is mounted on the protruded stopper. 3. The vehicle according to claim 1, further comprising a carriage mounted on the carriage and removed from the guideway.
Or the earth and sand discharge facility according to 3.