Excavation material transport system inside the tunnel

Abstract

To efficiently transport an excavated material even in a tunnel including a curved tunnel.SOLUTION: An excavated material transportation system in a tunnel comprises a first vehicle that can run in the tunnel, a first conveyor supported on a top of the first vehicle and capable of transporting excavated material in a first transport direction intersecting the vertical direction of the first vehicle, a second vehicle swingably connected to the first vehicle, a second conveyor supported on an upper part of the second vehicle and capable of transporting the excavated material in a second transport direction intersecting the vertical direction of the second vehicle, and a moving device capable of relatively moving the first conveyor and the second conveyor.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present invention relates to a system for transporting excavations in a mine tunnel. [Background technology]

[0002] Patent Document 1 discloses the following method for discharging excavated waste in a tunnel boring machine (TBM) for excavating rock. (1) A method in which a railway line is laid inside the tunnel and soil is removed using a debris-transporting trolley that runs on this line. (2) A method in which a railway track is laid inside the tunnel and soil is removed using a shuttle car that runs on this track. (3) A method of discharging soil using a continuous belt conveyor that is automatically pulled out as the excavation progresses. Of the above, a method of discharging soil using a continuous belt conveyor is disclosed in Patent Document 2. Patent Document 2 discloses a method in which a trailing bogie is brought on rails laid behind a tunnel boring machine, and the debris excavated by the tunnel boring machine is transported to the rear side of the trailing bogie by a belt conveyor supported on the top of the trailing bogie. In Patent Document 2, the belt conveyor is installed to extend beyond the trailing bogie to the rear side. The belt conveyor has a section length that can be freely changed along the longitudinal direction of the tunnel. The overhanging section of the belt conveyor, which is installed to extend further rearward from the trailing bogie, is supported by a conveyor receiving bogie and a debris removal cart. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-82100 [Patent Document 2] Japanese Patent Application Laid-Open No. 2001-152789 Summary of the Invention [Problem to be solved by the invention]

[0004] However, if the belt conveyor's overhanging section is supported by both the conveyor carrier and the shear car, it is difficult for the vehicle to handle the curved section of the tunnel when traveling through it. Therefore, there is room for improvement in terms of efficiently transporting excavated materials in tunnels, including curved tunnels.

[0005] Therefore, an object of the present invention is to provide an excavated material transportation system for tunnels that can efficiently transport excavated materials even in tunnels that include curved tunnels. [Means for solving the problem]

[0006] A system for transporting excavated material in a tunnel according to one embodiment of the present invention comprises a first vehicle capable of traveling in the tunnel, a first conveyor supported on the top of the first vehicle and capable of transporting the excavated material in a first transport direction intersecting the vertical direction of the first vehicle, a second vehicle connected to the first vehicle so as to be able to swing freely, a second conveyor supported on the top of the second vehicle and capable of transporting the excavated material in a second transport direction intersecting the vertical direction of the second vehicle, and a moving device capable of moving the first conveyor and the second conveyor relatively, wherein the moving device comprises a first rotation mechanism capable of rotating the first conveyor about a first axis line along the vertical direction of the first vehicle, and a second rotation mechanism capable of rotating the second conveyor about a second axis line along the vertical direction of the second vehicle, a first left-right movement mechanism that can move the first conveyor in the width direction of the first vehicle by driving a hydraulic cylinder; and a second left-right movement mechanism that can move the second conveyor in the width direction of the second vehicle by driving a hydraulic cylinder; Equipped with. [Effects of the Invention]

[0007] According to the above aspect, excavated materials can be transported efficiently even in tunnels including curved tunnels. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a side view of an excavated material transport system in a tunnel according to a first embodiment. [Figure 2] FIG. 4 is a side view of a second group of transport vehicles according to the first embodiment. [Figure 3]FIG. 4 is a top view of a second group of transporter vehicles according to the first embodiment. [Figure 4] FIG. 2 is an exploded perspective view of a first vehicle, a first conveyor, and a first movement mechanism according to the first embodiment. [Figure 5] FIG. 2 is an explanatory diagram of the arrangement of the bogie mechanism according to the first embodiment. [Figure 6] FIG. 2 is an explanatory diagram of the arrangement of multiple covering plates according to the first embodiment. [Figure 7] FIG. 2 is an explanatory diagram of the operation of the moving device according to the first embodiment. [Figure 8] 3A to 3C are diagrams showing an example of a method for loading excavated material according to the first embodiment. [Figure 9] 9 is a diagram showing an example of a method for loading excavated material, following FIG. 8. [Figure 10] 9, showing an example of a method for loading excavated material. [Figure 11] 5A and 5B are diagrams showing another example of the method for loading excavated material according to the first embodiment. [Figure 12] FIG. 10 is an exploded perspective view of a first vehicle, a first conveyor, and a first movement mechanism according to a second embodiment. [Figure 13] FIG. 13 is a cross-sectional view taken along the line XIII-XIII in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the embodiment, an example of an excavated material transport system in a tunnel will be described, in which an excavated material such as excavated mud is transported by traveling along a rail in a tunnel including a curved tunnel.

[0010] First Embodiment <Excavation material transportation system> FIG. 1 is a side view of an excavated material transport system for use in a tunnel according to a first embodiment. As shown in Fig. 1, the excavation material transportation system 1 includes an excavation and transportation vehicle 2 that excavates and transports excavated materials. The excavation and transportation vehicle 2 extends in the front-to-rear direction. The excavation and transportation vehicle 2 includes an excavator 3 and a group of trailing bogies 4.

[0011] For example, the excavator 3 is a tunnel boring machine (TBM) for excavating rock. The excavator 3 is arranged on the face (excavation) side of the excavation and transport vehicle 2. The excavator 3 is equipped with a cutter head 5 that can rotate around a predetermined axis. The excavator 3 excavates rock or the like by rotating the cutter head 5. The front end of a tow beam 6 is connected to the excavator 3. The rear end of the tow beam 6 is connected to the front end of the trailing bogie at the forefront.

[0012] Hereinafter, the direction in which the vehicle travels while the excavator 3 is excavating will be referred to as the "front of the vehicle," and the direction opposite to the front of the vehicle will be referred to as the rear of the vehicle. The right side of the direction in which the vehicle travels while the excavator 3 is excavating will be referred to as the right side, and the left side of the direction in which the vehicle travels while the excavator 3 is excavating will be referred to as the left side. The left-right direction of the vehicle will be referred to as the "width direction." The up-down direction of the vehicle is the direction perpendicular to the fore-aft and width directions of the vehicle. The underside of the vehicle is the side on which the wheels are attached in the up-down direction of the vehicle. The upper side of the vehicle is the opposite side of the side on which the wheels are attached in the up-down direction of the vehicle. In the example shown in the figure, the vehicle is placed on a horizontal plane. The up-down direction of the vehicle, the upper side of the vehicle, and the lower side of the vehicle correspond to the up-down direction (vertical direction), vertically upward, and vertically downward when the vehicle is placed on a horizontal plane, respectively. In the following description, the symbol L may be added to the end of left-side elements, and the symbol R may be added to the end of right-side elements.

[0013] The trailing bogie group 4 comprises a first transport vehicle group 10, a second transport vehicle group 20, and a towing vehicle 25. The vehicles of the first transport vehicle group 10 and the vehicles of the second transport vehicle group 20 are connected to each other by towing members such as connecting rods and towing brackets. Note that the first transport vehicle group 10 and the second transport vehicle group 20 are not connected to each other by towing members.

[0014] The first transport vehicle group 10 is arranged between the excavator 3 and the second transport vehicle group 20. For example, the first transport vehicle group 10 may be equipped with an equipment storage area, an operator's seat, an oil tank, a hydraulic pump, a dust collector, a water treatment tank for the dust collector, a control panel, an inverter panel, a transformer, a cable storage area, etc.

[0015] In the illustrated example, the first transport vehicle group 10 is made up of a total of seven vehicles, from vehicle number 11 to vehicle number 7 17. Vehicle number 11 is the leading trailing bogie in the first transport vehicle group 10. The rear end of the towing beam 6 is connected to the front end of vehicle number 11.

[0016] The excavated material excavated by the rotation of the cutter head 5 is taken into a hopper (not shown) on the back side of the cutter head 5. The excavated material taken into the hopper is transported rearward by a belt conveyor 9. The belt conveyor 9 is supported on the upper part of the first transport vehicle group 10. The belt conveyor 9 extends from the hopper to a position above the first car 11, passes above the first transport vehicle group 10, and extends to a position above and rear of the seventh car 17. The excavated material transported by the belt conveyor 9 is transported to a conveyor supported by the trailing carriage at the forefront of the second transport vehicle group 20. In the example shown in the figure, the belt conveyor 9 is divided between each carriage, and a belt conveyor with an upward slope at the rear is mounted on each carriage, and the excavated material is transported sequentially.

[0017] FIG. 2 is a side view of the second group of transporter vehicles according to the first embodiment. In the illustrated example, the second transport vehicle group 20 is made up of a total of three vehicles. As shown in FIG. 2, the second transport vehicle group 20 includes a first vehicle 21, a second vehicle 22, and a third vehicle 23. The first vehicle 21 is the trailing bogie at the forefront of the second transport vehicle group 20. The excavated material transported by the belt conveyor 9 is transported to a first conveyor 31 supported by the first vehicle 21. The first conveyor 31 is supported on the upper part of the first vehicle 21. The first conveyor 31 can transport the excavated material in a first transport direction V1 that is perpendicular to the up-and-down direction of the first vehicle 21.

[0018] The height H1 of the first vehicle 21 is higher than the height H2 of the second vehicle 22. The height H1 of the first vehicle 21 means the length of the first vehicle 21 in the vertical direction from the bottom end of the wheels of the first vehicle 21 to the top end of the first vehicle 21. The height H2 of the second vehicle 22 means the length of the second vehicle 22 in the vertical direction from the bottom end of the wheels of the second vehicle 22 to the top end of the second vehicle 22.

[0019] The second vehicle 22 is connected to the first vehicle 21 so as to be able to swing freely. The upper end of the second vehicle 22 on the first vehicle 21 side is arranged lower than the upper end of the first vehicle 21 on the second vehicle 22 side. The second conveyor 32 is supported on the upper part of the second vehicle 22. The second conveyor 32 is capable of transporting excavated material in a second transport direction V2 that is perpendicular to the up-and-down direction of the second vehicle 22. The upper end 32a of the second conveyor 32 on the first vehicle 21 side is arranged lower than the lower end 31a of the first conveyor 31 on the second vehicle 22 side.

[0020] The downstream end 31b of the first conveyor 31 in the first conveying direction V1 is located behind the upstream end 32b of the second conveyor 32 in the second conveying direction V2. In the example shown in the figure, the state in which the first conveyor 31 has moved to the most downstream side in the first conveying direction V1 is indicated by a solid line, and the state in which the second conveyor 32 has moved to the most upstream side in the second conveying direction V2 is indicated by a two-dot chain line.

[0021] The first inclination angle K1 between a plane perpendicular to the vertical direction of the first vehicle 21 and the conveying surface along which the first conveyor 31 conveys the excavated material in the first conveying direction V1 is the same as the second inclination angle K2 between a plane perpendicular to the vertical direction of the second vehicle 22 and the conveying surface along which the second conveyor 32 conveys the excavated material in the second conveying direction V2 (K1 = K2). In the example shown in the figure, the first conveyor 31 when the first inclination angle K1 is zero and the second conveyor 32 when the second inclination angle K2 is zero are shown by solid lines, and the conveying surface of the first conveyor 31 when the first inclination angle K1 is greater than zero (when the conveying surface is tilted upward at the rear) and the conveying surface of the second conveyor 32 when the second inclination angle K2 is greater than zero (when the conveying surface is tilted upward at the rear) are shown by two-dot chain lines.

[0022] The third vehicle 23 is connected to the second vehicle 22 so as to be able to swing freely. The height H3 of the third vehicle 23 is the same as the height H2 of the second vehicle 22. The height H3 of the third vehicle 23 means the length of the third vehicle 23 in the vertical direction from the lower end of the wheels of the third vehicle 23 to the upper end of the third vehicle 23. The upper end of the third vehicle 23 on the second vehicle 22 side is disposed at the same height as the upper end of the second vehicle 22 on the third vehicle 23 side.

[0023] FIG. 3 is a top view of the second transporter vehicle group according to the first embodiment. As shown in FIG. 3, the first vehicle 21, the second vehicle 22, and the third vehicle 23 are all the same length in the width direction. In the example shown in the figure, the first vehicle 21, the second vehicle 22, and the third vehicle 23 are lined up in the front-to-rear direction. The belt conveyor 9, the first conveyor 31, and the second conveyor 32 are all the same width in the width direction. The belt conveyor 9, the first conveyor 31, and the second conveyor 32 are shorter in the width direction than the first vehicle 21, the second vehicle 22, and the third vehicle 23. In the example shown in the figure, the belt conveyor 9, the first conveyor 31, and the second conveyor 32 are arranged on the center line CL in the vehicle width direction.

[0024] 3, the rear portion of the belt conveyor 9 overlaps with the front portion of the first conveyor 31. In the top view of FIG. 3, the rear portion of the first conveyor 31 overlaps with the front portion of the second conveyor 32. In the top view of FIG. 3, the belt conveyor 9, the first conveyor 31, and the second conveyor 32 are arranged so as to be continuous in the front-to-rear direction.

[0025] As shown in FIG. 1, a towing vehicle 25 is disposed at the rear of the excavation and transport vehicle 2. The towing vehicle 25 is capable of towing the second group of transport vehicles 20. The towing vehicle 25 is coupled to the third vehicle 23 so as to be able to swing freely. The towing vehicle 25 is disposed on the mine entrance (ground) side of the excavation and transport vehicle 2. The towing vehicle 25 is self-propelled. The second group of transport vehicles 20 are capable of traveling along rails within the mine tunnel by being driven by the towing vehicle 25. The towing vehicle 25 is equipped with a battery capable of supplying power to each vehicle of the second group of transport vehicles 20.

[0026] <Movement Device> The second transport vehicle group 20 is equipped with a moving device 40 that can move the first conveyor 31 and the second conveyor 32 relatively. The moving device 40 is equipped with a first moving mechanism 41 that can move the first conveyor 31 in a direction perpendicular to the up-down direction of the first vehicle 21, and a second moving mechanism 42 that can move the second conveyor 32 in a direction perpendicular to the up-down direction of the second vehicle 22. The first moving mechanism 41 will be described in detail below. The second moving mechanism 42 has a similar configuration to the first moving mechanism 41, so a detailed description thereof will be omitted.

[0027] FIG. 4 is an exploded perspective view of the first vehicle, the first conveyor, and the first movement mechanism according to the first embodiment. As shown in FIG. 4, the first moving mechanism 41 is provided on the first vehicle 21.

[0028] <First car> The first vehicle 21 includes a carrier 50, a vehicle body frame 51, a blade 52, and bogie mechanisms 53A and 53B. The carrier 50 has a storage space 60 in which excavated material such as excavated mud can be loaded. The carrier 50 is box-shaped and opens upward. The carrier 50 has a bottom wall 61, a front wall 62, a rear wall 63, a left wall 64, and a right wall 65. The storage space 60 is a space surrounded by the bottom wall 61, the front wall 62, the rear wall 63, the left wall 64, and the right wall 65.

[0029] The bottom wall 61 is provided at the bottom of the carrier 50. The bottom wall 61 extends in the front-rear direction and the vehicle width direction. The front wall 62 stands upward from the front end of the bottom wall 61. The rear wall 63 stands upward from the rear end of the bottom wall 61. When viewed from the front-rear direction, the outer edges of the front wall 62 and the rear wall 63 in the vehicle width direction extend at an angle upward from the bottom wall 61 so as to be positioned outward in the vehicle width direction, and then extend upward.

[0030] The left wall 64 stands upward from the left end of the bottom wall 61. The right wall 65 stands upward from the right end of the bottom wall 61. When viewed from the front-rear direction, the left wall 64 and the right wall 65 extend along the outer edges of the front wall 62 and the rear wall 63 in the vehicle width direction. When viewed from the front-rear direction, the left wall 64 and the right wall 65 extend at an angle upward from the bottom wall 61 so as to be positioned outward in the vehicle width direction, and then extend upward.

[0031] The left wall 64 and the right wall 65 are connected at their upper central portions in the front-to-rear direction by a bridging member 66 extending in the vehicle width direction. The bridging member 66 extends continuously in the vehicle width direction between the upper portions of the left wall 64 and the right wall 65 in the vehicle width direction. The bridging member 66 divides the upper space of the storage space 60 in the front-to-rear direction.

[0032] For example, storage spaces 67 for materials may be provided on the left and right outer sides of the lower part of the carrier 50. In the example shown in the figure, the storage space 67 on the left outer side is indicated by a two-dot chain line. In this embodiment, the left wall 64 and the right wall 65 that form the left and right side parts of the lower part of the carrier 50 extend at an angle upward from the bottom wall 61 side when viewed from the front-to-rear direction so as to be positioned outward in the vehicle width direction. Therefore, the spaces on the left and right outer sides of the lower part of the carrier 50 can be effectively used as storage spaces 67 for materials.

[0033] The body frame 51 is a skeletal member of the first vehicle 21. The body frame 51 supports the carrier 50. The first vehicle 21 is connected to adjacent vehicles in the longitudinal direction via the body frame 51. A front connecting bracket 70 is provided on the front lower part of the body frame 51 for connecting the first vehicle 21 to an adjacent vehicle in front of the first vehicle 21.

[0034] In this embodiment, the first vehicle 21 is not connected to the seventh vehicle 17 (see FIG. 1) via the front connecting bracket 70. A pair of front connecting brackets 70 are provided spaced apart in the vertical direction. The front connecting brackets 70 have through holes that open in the vertical direction. In this embodiment, the second vehicle 22 is swingably connected to the first vehicle 21 via a front connecting bracket 70. The third vehicle 23 is swingably connected to the second vehicle 22 via a front connecting bracket 70. The towing vehicle 25 is swingably connected to the third vehicle 23 via a front connecting bracket 70.

[0035] Although not shown, a rear connection bracket is provided on the lower rear side of the body frame 51 for connecting the first vehicle 21 to an adjacent vehicle behind it. In this embodiment, the first vehicle 21 is connected to the second vehicle 22 (see FIG. 1) via the rear connection bracket. Similar to the front connection bracket 70, a pair of rear connection brackets may be provided spaced apart in the vertical direction. The first vehicle 21 is connected to the second vehicle 22 via the rear connection bracket so as to be able to swing freely.

[0036] As shown in Fig. 4, the body frame 51 includes a bottom frame 71, a front frame 72, and a rear frame 73. The bottom frame 71 has a rectangular frame shape extending in the front-rear direction when viewed from the top-bottom direction. The bottom frame 71 is longer than the carrier 50 in the front-rear direction. The bottom frame 71 extends further outward in the front-rear direction than the outer end of the carrier 50 in the front-rear direction.

[0037] The front frame 72 connects the front portion of the bottom frame 71 to the upper front portion of the carrier 50. The front frame 72 extends upward from the center of the front portion of the bottom frame 71 in the vehicle width direction, and then bends and extends toward the upper front portion of the carrier 50. The front frame 72 has a flat front upper surface 72a that extends along a direction perpendicular to the vertical direction of the vehicle. The rear frame 73 connects the rear portion of the bottom frame 71 to the upper rear portion of the carrier 50. The rear frame 73 has a flat rear upper surface 73a that extends along a direction perpendicular to the vertical direction of the vehicle.

[0038] The front upper surface 72a and the rear upper surface 73a are disposed at the same height (in the vertical direction of the vehicle) and face the lower surface of the first conveyor 31. When viewed from above, the front upper surface 72a and the rear upper surface 73a are trapezoidal in shape with their upper bases on the outer sides in the front-to-rear direction.

[0039] For example, the front upper surface 72a, the rear upper surface 73a, and the cross member 66 may be provided with friction reducing members for reducing friction (sliding friction) during rotation of the first conveyor 31. This allows the first conveyor 31 to rotate smoothly.

[0040] For example, a power unit 75 including a drive system such as a motor, an inverter, and a hydraulic pump may be provided on the left side of the rear frame 73 on the rear portion of the bottom frame 71. For example, a control device 76 that controls the components of the power unit 75 may be provided adjacent to the power unit 75. This allows the power unit 75 and the control device 76 to be arranged by effectively utilizing the space on the left side of the rear frame 73.

[0041] The blade 52 is a member for leveling the excavated material in the storage space 60 from above. The blade 52 extends in the vertical direction and the vehicle width direction. The blade 52 is shaped so that it can move in the front-to-rear direction in the space above the storage space 60. The upper edge 52a of the blade 52 is linear and extends in the vehicle width direction. The upper edge 52a of the blade 52 is positioned below the height position of the front upper surface 72a and the rear upper surface 73a. The blade 52 is positioned below the rotation trajectory of the first conveyor 31. The blade 52 may be shaped so that it can pass under the cross member 66 and level the excavated material up to the rear of the cross member 66.

[0042] The outer shape of the lower part of the blade 52 is trapezoidal with an upper base at the bottom when viewed from the front-to-rear direction. The lower edge 52b of the blade 52 is linear and extends in the width direction of the vehicle. This allows the excavated material loaded into the storage space 60 to be leveled from above by moving the blade 52 in the front-to-rear direction.

[0043] The front wall 62 of the carrier 50 is provided with blade hydraulic cylinders 55L, 55R that can move the blade 52 in the front-rear direction. The blade hydraulic cylinders 55L, 55R extend in the front-rear direction. The blade hydraulic cylinders 55L, 55R are provided on both the left and right sides of the upper part of the front wall 62 via the front frame 72. The blade hydraulic cylinders 55L, 55R are inserted into through-holes that open in the front wall 62 in the front-rear direction. The rear ends (tips of the piston rods) of the blade hydraulic cylinders 55L, 55R are connected to the left and right ends of the blade 52 through the through-holes in the front wall 62. The blade hydraulic cylinders 55L, 55R are driven by hydraulic oil supplied from a hydraulic pump.

[0044] Guide members 56 that guide the blade 52 in the front-to-rear direction are provided on the left wall 64 and the right wall 65 of the carrier 50. The guide members 56 are arranged inside the upper portions of the left wall 64 and the right wall 65. The guide members 56 extend in the front-to-rear direction. The end of the blade 52 in the vehicle width direction is arranged on the guide members 56. The blade 52 moves in the direction of arrow A1 along the guide members 56 by being driven by the blade hydraulic cylinders 55L, 55R.

[0045] The carrier 50 is provided with a discharge hole (not shown) for discharging the excavated material in the accommodation space 60. The discharge hole opens in the vertical direction in the bottom wall 61 of the carrier 50. For example, the discharge hole is opened large in one place in the bottom wall 61.

[0046] The carrier 50 is provided with gate members 57L, 57R that can move to open and close the discharge hole. A pair of gate members 57L, 57R are provided on the left and right. The illustrated example shows the state in which the left and right gate members 57L, 57R are closing the discharge hole. The gate members 57L, 57R are fan-shaped with an arc on the lower side in front view. The gate members 57L, 57R extend rearward from the bottom of the fan shape so as to close the discharge hole. The gate members 57L, 57R are rotatable about an axis along the front-rear direction.

[0047] A gate hydraulic cylinder 58 capable of moving gate members 57L, 57R is provided on the front side of the carrier 50. The gate hydraulic cylinder 58 extends in the vehicle width direction. The left end (piston rod tip) of the gate hydraulic cylinder 58 is connected to the left gate member 57L. The gate hydraulic cylinder 58 is driven by hydraulic oil supplied from a hydraulic pump.

[0048] The right gate member 57R is in contact with the left gate member 57L. The right gate member 57R moves in conjunction with the left gate member 57L. The left and right gate members 57L, 57R are driven by a gate hydraulic cylinder 58 to rotate about their respective axes so as to open and close the discharge holes.

[0049] A pivot member 68 that rotatably supports the first conveyor 31 is provided on the rear side of the carrier 50. The pivot member 68 protrudes forward from the vehicle width direction center portion at the top of the rear wall 63 of the carrier 50. The pivot member 68 has a pivot hole on a first axis D1 that follows the up-down direction of the first vehicle 21. The pivot hole is circular when viewed from the up-down direction. In the top view of FIG. 3, the first axis D1 is located on the vehicle left-right center line CL.

[0050] As shown in FIG. 4, the wheels of the first vehicle 21 are supported by bogie mechanisms 53A and 53B. The bogie mechanisms 53A and 53B can rotate the wheels of the first vehicle 21 in a direction perpendicular to the up-down direction of the first vehicle 21. The bogie mechanisms 53A and 53B are provided as a pair spaced apart in the front-to-rear direction. The pair of front and rear bogie mechanisms 53A and 53B are a front-wheel bogie mechanism 53A and a rear-wheel bogie mechanism 53B. The front-wheel bogie mechanism 53A can rotate the front wheels of the first vehicle 21 in a direction perpendicular to the up-down direction of the first vehicle 21. The rear-wheel bogie mechanism 53B can rotate the rear wheels of the first vehicle 21 in a direction perpendicular to the up-down direction of the first vehicle 21. The front-wheel bogie mechanism 53A will be described in detail below. The rear-wheel bogie mechanism 53B has a similar configuration to the front-wheel bogie mechanism 53A, and therefore a detailed description thereof will be omitted.

[0051] The front wheel bogie mechanism 53A includes a swing frame 80 and pitching frames 81L and 81R. The swing frame 80 is swingably connected to the body frame 51. The swing frame 80 extends between the left and right rails 90L, 90R. The center portion of the swing frame 80 between the left and right rails 90L, 90R is connected to the body frame 51 so as to be rotatable about an axis extending in the vertical direction.

[0052] Figure 5 is an explanatory diagram of the arrangement of the bogie mechanism according to the first embodiment. Figure 5 corresponds to a top view of the first vehicle 21. In Figure 5, the outline of the first vehicle 21 and the bottom frame 71 of the body frame 51 are indicated by two-dot chain lines. 5, the center of rotation of the swing frame 80 is disposed on the center line CL of the body frame 51 in the vehicle width direction.

[0053] The pitching frames 81L, 81R are connected to the left and right ends of the swing frame 80. The pitching frames 81L, 81R are provided on the left and right rails 90L, 90R. The pitching frames 81L, 81R support the wheels of the first vehicle 21 so that they can rotate.

[0054] The swing frame 80 of the front bogie mechanism 53A is connected to the front portion of the bottom frame 71 of the body frame 51. On the other hand, the swing frame 80 of the rear bogie mechanism 53B is connected to the rear portion of the bottom frame 71.

[0055] The pitching frames 81L, 81R of the front wheel bogie mechanism 53A rotatably support the front wheels of the first vehicle 21. In the example shown in the figure, a total of four front wheels are provided: a pair of left and right front front wheels 85L, 85R and a pair of left and right rear front wheels 86L, 86R. The front wheels 85L, 85R, 86L, 86R of the first vehicle 21, together with the front wheel bogie mechanism 53A, can independently rotate relative to the front part of the body frame 51 in a direction perpendicular to the up-and-down direction of the first vehicle 21.

[0056] Meanwhile, the pitching frames 81L, 81R of the rear wheel bogie mechanism 53B rotatably support the rear wheels of the first vehicle 21. In the example shown in the figure, a total of four rear wheels are provided: a pair of left and right front rear wheels 87L, 87R and a pair of left and right rear wheels 88L, 88R. The rear wheels 87L, 87R, 88L, 88R of the first vehicle 21, together with the rear wheel bogie mechanism 53B, can independently rotate in a direction perpendicular to the up-and-down direction of the first vehicle 21 relative to the rear of the body frame 51.

[0057] <First conveyor> As shown in Fig. 2, the first conveyor 31 is supported on the upper part of the first vehicle 21. The first conveyor 31 is capable of transporting excavated material in a first transport direction V1 that is perpendicular to the up-down direction of the first vehicle 21. As shown in Fig. 4, the first conveyor 31 includes a conveyor unit 100 and a support frame 101.

[0058] The conveyor unit 100 includes a conveyor body 103 and a conveyor frame 104 . The conveyor body 103 has a longitudinal direction that is the first conveying direction V1. The conveyor body 103 is a belt conveyor. In the illustrated example, the longitudinal direction of the conveyor body 103 is parallel to the front-to-rear direction of the first vehicle 21. In the illustrated example, the short side direction of the conveyor body 103 is parallel to the width direction of the first vehicle 21.

[0059] The conveyor frame 104 supports the conveyor body 103. Like the conveyor body 103, the conveyor frame 104 has a longitudinal direction that corresponds to the first conveying direction V1. The conveyor frame 104 is supported on the support frame 101 so as to be slidable in the longitudinal direction. The conveyor frame 104 is longer than the conveyor body 103 in the longitudinal direction. The conveyor frame 104 includes a conveyor bottom plate 105, a first conveyor first side plate 106, and a first conveyor second side plate 107.

[0060] The conveyor bottom plate 105 is a rectangular plate whose longitudinal direction is the first conveying direction V1. The first conveyor first side plate 106 and the first conveyor second side plate 107 stand upright from the short-side end of the conveyor bottom plate 105. The first conveyor first side plate 106 and the first conveyor second side plate 107 are at the same standing height position (position in the vehicle up-down direction). The first conveyor first side plate 106 and the first conveyor second side plate 107 are arranged with a gap between them in the short-side direction of the conveyor body 103. The first conveyor first side plate 106 and the first conveyor second side plate 107 extend parallel to each other in the longitudinal direction. The first conveyor first side plate 106 and the first conveyor second side plate 107 have the same length in the longitudinal direction.

[0061] The first conveyor first side plate 106 and the first conveyor second side plate 107 are provided with a pair of protrusions 108, 109 that protrude outward in the short direction of the conveyor body 103. The pair of protrusions 108, 109 is a central protrusion 108 and an end protrusion 109.

[0062] The central convex portion 108 is provided at the longitudinal center of the lower edge of the first conveyor first side plate 106 and the first conveyor second side plate 107. In the example shown in the figure, the central convex portion 108 on the first conveyor first side plate 106 side is shown.

[0063] The end-side protrusions 109 are provided at the longitudinal ends of the lower edges of the first conveyor first side plate 106 and the first conveyor second side plate 107. In the example shown in the figure, the end-side protrusions 109 are arranged at the front ends of the first conveyor first side plate 106 and the first conveyor second side plate 107. The protruding height positions (positions in the short direction of the conveyor body 103) of the center-side protrusions 108 and the end-side protrusions 109 are the same.

[0064] The support frame 101 supports the conveyor unit 100. The support frame 101 is connected to the first vehicle 21 so as to be able to swing freely. The support frame 101 has a longitudinal direction that is the first conveying direction V1. In the example shown in the figure, the longitudinal direction of the support frame 101 is the first conveying direction V1, just like the conveyor body 103. The short side direction of the support frame 101 is parallel to the short side direction of the conveyor body 103.

[0065] The support frame 101 has a U-shape when viewed in the longitudinal direction. The support frame 101 includes a support bottom plate 110, a first support side plate 111, and a second support side plate 112.

[0066] The support bottom plate 110 is plate-shaped with its longitudinal direction aligned with the first conveying direction V1. The support bottom plate 110 has a shaft hole 113 on a first axis D1 that is aligned with the up-down direction of the first vehicle 21. The shaft hole 113 is circular when viewed from the up-down direction. The shaft hole 113 is located at one end of the support bottom plate 110 in the longitudinal direction. In the example shown in the figure, the shaft hole 113 is located at the rear end of the support bottom plate 110. The shaft hole 113 overlaps with the pivot hole of the pivot member 68 when viewed from the up-down direction. For example, the support bottom plate 110 is connected to the pivot member 68 via a shaft member 115 such as a pin. The support frame 101 is rotatable about the first axis D1.

[0067] The first support side plate 111 and the second support side plate 112 stand upright from the short-side end of the support bottom plate 110. The first support side plate 111 and the second support side plate 112 have the same standing height position (position in the vehicle up-down direction). The first support side plate 111 and the second support side plate 112 extend parallel to each other in the longitudinal direction of the support bottom plate 110. The first support side plate 111 and the second support side plate 112 have the same length in the longitudinal direction of the support bottom plate 110. The first support side plate 111 and the second support side plate 112 are arranged outward of the first conveyor first side plate 106 and the first conveyor second side plate 107 in the short-side direction of the support bottom plate 110.

[0068] In the short direction of the support bottom plate 110, the distance between the first support side plate 111 and the second support side plate 112 is equal to or greater than the protruding height of the convex portions 108, 109 on the first conveyor first side plate 106 and the first conveyor second side plate 107.

[0069] For example, the pair of protrusions 108, 109 may be provided with friction reducing members for reducing friction (sliding friction) during movement of the conveyor unit 100. This allows the conveyor unit 100 to move smoothly relative to the support frame 101.

[0070] The support bottom plate 110 has an opening 114 large enough to allow the excavated material to pass through. The opening 114 is rectangular when viewed from the top-bottom direction. The opening 114 is located at the other end of the support bottom plate 110 in the longitudinal direction. In the example shown in the figure, the opening 114 is located at the front end of the support bottom plate 110. The opening 114 is located on the opposite side of the support bottom plate 110 from the shaft hole 113 in the longitudinal direction. The opening 114 is opened and closed by longitudinal movement of the conveyor unit 100 relative to the support frame 101. When the excavated material passes through, the opening 114 opens in the vertical direction and communicates with the storage space 60.

[0071] <1st movement mechanism> The first movement mechanism 41 is capable of moving the first conveyor 31 in a direction perpendicular to the up-and-down direction of the first vehicle 21. The first movement mechanism 41 includes a first longitudinal movement mechanism 120 that is capable of moving the first conveyor 31 in the longitudinal direction of the first conveyor 31. The first longitudinal movement mechanism 120 is provided on the support frame 101.

[0072] The first longitudinal movement mechanism 120 includes longitudinal movement hydraulic cylinders 121L, 121R extending in the longitudinal direction of the support bottom plate 110. The longitudinal movement hydraulic cylinders 121L, 121R are provided as a pair spaced apart in the lateral direction of the support bottom plate 110. First longitudinal ends (piston rod tips) of the longitudinal movement hydraulic cylinders 121L, 121R are connected to the longitudinal centers of the first conveyor first side plate 106 and the first conveyor second side plate 107. Second longitudinal ends (ends opposite the piston rod tips) of the longitudinal movement hydraulic cylinders 121L, 121R are connected near the longitudinal centers of the first support side plate 111 and the second support side plate 112. The longitudinal movement hydraulic cylinders 121L, 121R are driven by hydraulic oil supplied from a hydraulic pump. The conveyor unit 100 moves in the direction of arrow B1 along the support frame 101 by being driven by the longitudinal movement hydraulic cylinders 121L and 121R.

[0073] The first movement mechanism 41 includes a first left-right movement mechanism 130 that can move the first conveyor 31 in the width direction of the first vehicle 21. The first left-right movement mechanism 130 is disposed between the first vehicle 21 and the first conveyor 31.

[0074] The first left-right movement mechanism 130 includes first hydraulic cylinders 131L, 131R that connect the first vehicle 21 and the first conveyor 31 so as to move the first conveyor 31 in a direction perpendicular to the up-and-down direction of the first vehicle 21. The first hydraulic cylinders 131L, 131R are provided as a pair spaced apart in the width direction of the first vehicle 21. The pair of first hydraulic cylinders 131L, 131R connect the upper portions of the left wall 64 and right wall 65 of the carrier 50 to the support frame 101.

[0075] In the illustrated example, the pair of first hydraulic cylinders 131L, 131R extend in the width direction of the first vehicle 21. A first longitudinal end (piston rod tip) of the left first hydraulic cylinder 131L is connected to the first support side plate 111 near the longitudinal center. The connection position of the left first hydraulic cylinder 131L to the first support side plate 111 is disposed between the shaft hole 113 and the opening 114 in the longitudinal direction of the support frame 101. The first longitudinal end of the left first hydraulic cylinder 131L is rotatable about an axis that extends along the up-down direction at the connection portion of the first support side plate 111.

[0076] A second longitudinal end portion (the end portion opposite the piston rod tip portion) of the left first hydraulic cylinder 131L is connected to the upper end portion of the left wall 64 of the carrier 50. The connection position of the left first hydraulic cylinder 131L with respect to the left wall 64 of the carrier 50 is disposed near the left end portion of the cross member 66 when viewed from the vertical direction. The second longitudinal end portion of the left first hydraulic cylinder 131L is rotatable around an axis along the vertical direction at the connection portion of the left wall 64.

[0077] A first longitudinal end (piston rod tip) of the right-side first hydraulic cylinder 131R is connected to the vicinity of the longitudinal center of the second support side plate 112. The connection position of the right-side first hydraulic cylinder 131R to the second support side plate 112 is disposed between the shaft hole 113 and the opening 114 in the longitudinal direction of the support frame 101. The first longitudinal end of the right-side first hydraulic cylinder 131R is rotatable about an axis extending along the up-down direction at the connection portion of the second support side plate 112.

[0078] A second longitudinal end portion (the end portion opposite the piston rod tip portion) of the right-side first hydraulic cylinder 131R is connected to the upper end portion of the right wall 65 of the carrier 50. The connection position of the right-side first hydraulic cylinder 131R with respect to the right wall 65 of the carrier 50 is disposed near the right end portion of the cross member 66 when viewed from the vertical direction. The second longitudinal end portion of the right-side first hydraulic cylinder 131R is rotatable about an axis along the vertical direction at the connection portion of the right wall 65.

[0079] The first hydraulic cylinders 131L, 131R are driven by hydraulic oil supplied from a hydraulic pump. The first conveyor 31 rotates about a first axis D1 by being driven by the first hydraulic cylinders 131L, 131R.

[0080] For example, when the left first hydraulic cylinder 131L extends beyond a predetermined length and the right first hydraulic cylinder 131R retracts beyond a predetermined length, the first conveyor 31 rotates around the first axis D1 in the direction of arrow R1. On the other hand, when the left first hydraulic cylinder 131L retracts beyond a predetermined length and the right first hydraulic cylinder 131R extends beyond a predetermined length, the first conveyor 31 rotates around the first axis D1 in the direction opposite to the direction of arrow R1.

[0081] In this way, the first left-right movement mechanism 130 can rotate the first conveyor 31 about the first axis D1. The first left-right movement mechanism 130 corresponds to a first rotation mechanism 140 that can rotate the first conveyor 31 about the first axis D1 that is along the up-and-down direction of the first vehicle 21. The first left-right movement mechanism 130 functions as the first rotation mechanism 140 by cooperation between the left and right first hydraulic cylinders 131L, 131R and the shaft member 115 that passes through the pivot hole of the pivot member 68 and the shaft hole 113.

[0082] <Second movement mechanism> 1, the second moving mechanism 42 is provided on the second vehicle 22. Similar to the first vehicle 21 shown in FIG. 4, the second vehicle 22 includes a carrier 50, a frame 51, a blade 52, and bogie mechanisms 53A and 53B. In the second vehicle 22, a second pivot member (not shown) that rotatably supports the second conveyor 32 is provided on the front side of the carrier 50. The second pivot member is arranged on the opposite side in the front-rear direction from the pivot member 68 of the first vehicle 21. The second pivot member protrudes rearward from the center in the vehicle width direction at the top of the front wall 62 of the carrier 50. The second pivot member has a pivot hole on a second axis D2 that follows the up-down direction of the second vehicle 22. In the top view of FIG. 3, the second axis D2 is arranged on the vehicle lateral center line CL.

[0083] The second movement mechanism 42 includes a second longitudinal movement mechanism (not shown) that can move the second conveyor 32 in the longitudinal direction of the second conveyor 32. The second longitudinal movement mechanism is provided on a support frame 101 of the second conveyor 32. The second longitudinal movement mechanism has a similar configuration to the first longitudinal movement mechanism 120 shown in FIG. 4, and therefore a detailed description thereof will be omitted.

[0084] The second movement mechanism 42 includes a second left-right movement mechanism (not shown) that can move the second conveyor 32 in the width direction of the second vehicle 22. The second left-right movement mechanism is disposed between the second vehicle 22 and the second conveyor 32. The second left-right movement mechanism has a configuration similar to that of the first left-right movement mechanism 130 shown in FIG. 4, and therefore a detailed description thereof will be omitted.

[0085] The second left-right movement mechanism includes a second hydraulic cylinder (not shown) that connects the second vehicle 22 and the second conveyor 32 so as to allow the second conveyor 32 to move in a direction perpendicular to the up-and-down direction of the second vehicle 22. The second hydraulic cylinder has a configuration similar to that of the first hydraulic cylinders 131L, 131R shown in Figure 4, and therefore a detailed description thereof will be omitted.

[0086] The second hydraulic cylinder is driven by hydraulic oil supplied from a hydraulic pump. The second conveyor 32 rotates about the second axis D2 by being driven by the second hydraulic cylinder. The second left-right movement mechanism is capable of rotating the second conveyor 32 about the second axis D2. The second left-right movement mechanism corresponds to a second rotation mechanism that is capable of rotating the second conveyor 32 about the second axis D2 that is along the up-down direction of the second vehicle 22. The second rotation mechanism has a configuration similar to that of the first rotation mechanism 140 shown in FIG. 4, and therefore a detailed description thereof will be omitted.

[0087] <Covering plate> Fig. 6 is an explanatory diagram of the arrangement of a plurality of lining plates according to the first embodiment. Fig. 6 is a diagram equivalent to a tunnel cross section. As shown in FIG. 6, the excavated material transport system 1 includes rails 90L and 90R and a plurality of lining plates 91 and 92. The rails 90L, 90R support the wheels of the excavation and transport vehicle 2 shown in FIG. 1 (including the wheels of the first vehicle 21 and the second vehicle 22). The rails 90L, 90R are supported by sleepers 95. In the cross-sectional view of FIG. 6, the sleepers 95 are U-shaped. A plurality of sleepers 95 are arranged at intervals in the depth direction of the paper in FIG. 6.

[0088] As shown in Fig. 1, the multiple lining plates 91, 92 are separated by rails 90L, 90R. The multiple lining plates 91, 92 are arranged vertically above the upper ends of the rails 90L, 90R. The upper surfaces of the multiple lining plates 91, 92 are arranged on substantially the same plane.

[0089] The multiple covering plates 91, 92 include a center block 91 and side blocks 92L, 92R. The center block 91 is arranged between a pair of rails 90L, 90R. The center block 91 is provided so as to straddle the left and right inner sides of the sleepers 95. The side blocks 92L, 92R are arranged outside the pair of rails 90L, 90R. The side blocks 92L, 92R are arranged in pair on the left and right with the center block 91 interposed between them.

[0090] The upper end of the left side block 92L on the center block 91 side is positioned in substantially the same vertical position as the upper left end of the center block 91. The upper end of the right side block 92R on the center block 91 side is positioned in substantially the same vertical position as the upper right end of the center block 91.

[0091] <Operation of the moving device> FIG. 7 is an explanatory diagram of the operation of the moving device according to the first embodiment. As shown in Fig. 7, the first conveyor 31 is rotatable around a first axis D1 at the rear of the first vehicle 21. The second conveyor 32 is rotatable around a second axis D2 at the front of the second vehicle 22. In the example shown in the figure, the first conveyor 31 and the second conveyor 32 before rotation are shown by two-dot chain lines, and the first conveyor 31 and the second conveyor 32 after rotation are shown by solid lines. For example, the rotation angles of the first conveyor 31 and the second conveyor 32 may be limited so as not to interfere with the wall surface of the tunnel during their respective rotations.

[0092] When the first vehicle 21 and the second vehicle 22 travel through a curved tunnel, the first conveyor 31 and the second conveyor 32 move in a direction perpendicular to the up-and-down direction of the vehicles by the action of the moving device 40. For example, when the first vehicle 21 and the second vehicle 22 pass through a curved section that curves left with respect to the traveling direction, the first conveyor 31 rotates in the direction of arrow R1 shown in Fig. 7, and the second conveyor 32 rotates in the direction of arrow R2 shown in Fig. 7. On the other hand, when the first vehicle 21 and the second vehicle 22 pass through a curved section that curves right with respect to the traveling direction, the first conveyor 31 rotates in the direction opposite to the direction of arrow R1 shown in Fig. 7, and the second conveyor 32 rotates in the direction opposite to the direction of arrow R2 shown in Fig. 7.

[0093] In this embodiment, the first conveyor 31 and the second conveyor 32 can move in their respective longitudinal directions and in their respective vehicle width directions by the action of the moving device 40. Therefore, even when the first vehicle 21 and the second vehicle 22 travel through a curved tunnel, the end of the first conveyor 31 on the seventh vehicle 17 side can overlap with the end of the belt conveyor 9 on the first vehicle 21 side in a top view, and the end of the first conveyor 31 on the second vehicle 22 side can overlap with the end of the second conveyor 32 on the first vehicle 21 side in a top view.

[0094] <An example of how to load excavated material> Fig. 8 is a diagram showing an example of a method for loading excavated material according to the first embodiment. Fig. 9 is a diagram showing an example of a method for loading excavated material following Fig. 8. Fig. 10 is a diagram showing an example of a method for loading excavated material following Fig. 9. An example of a method for loading excavated material will be described with reference to Figs. 8 to 10. For example, as shown in FIG. 8, the excavated material is transported from the belt conveyor 9 through the first conveyor 31 and the second conveyor 32 toward the third vehicle 23 (in the directions of arrows W11, W12, W13, W14, and W15 in the figure). Next, the excavated material is loaded into the storage space of the carrier of the third vehicle 23. If the excavated material locally rises in the storage space, the blade 52 is moved to level the excavated material in the storage space from above. In this way, the excavated material transported from the belt conveyor 9 is loaded onto the third vehicle 23.

[0095] As shown in Figure 9, after a predetermined amount of excavated material has been loaded onto the third vehicle 23, it is transported from the belt conveyor 9 via the first conveyor 31 to the second conveyor 32, and then loaded into the storage space of the carrier of the second vehicle 22 through the opening at the front of the second conveyor 32 (in the direction of arrows W21, W22, and W23 in the figure). If the excavated material locally rises within the storage space, the blade 52 is moved to level the excavated material within the storage space from above. In this way, the excavated material transported from the belt conveyor 9 is loaded onto the second vehicle 22.

[0096] As shown in Fig. 10, after a predetermined amount of excavated material has been loaded onto the second vehicle 22, the excavated material is transported from the belt conveyor 9 to the first conveyor 31 and loaded into the storage space 60 of the carrier 50 of the first vehicle 21 through the opening 114 on the front side of the first conveyor 31 (in the direction of arrow W31 in the figure). If the excavated material locally rises within the storage space 60, the blade 52 is moved in the direction of arrow X1 to level the excavated material within the storage space 60 from above. In this way, the excavated material transported from the belt conveyor 9 is loaded onto the first vehicle 21. As a result of the above, the excavated material can be loaded onto the first vehicle 21, the second vehicle 22, and the third vehicle 23.

[0097] In this way, by loading the excavated material transported from the belt conveyor 9 starting from the rear vehicle, the load capacity can be adjusted by the front vehicle with a larger capacity.From the perspective of system redundancy, by loading the excavated material at the mine entrance first, even if there is a problem with the excavation or the belt conveyor, the excavated material that has already been loaded can be transported.

[0098] <Another example of how to load excavated material> 11 is a diagram showing another example of the method for loading excavated materials according to the first embodiment. Using FIG. 11, another example of the method for loading excavated materials will be described. For example, the excavated material is transported from the belt conveyor 9 to the first conveyor 31, and loaded into the storage space 60 of the carrier 50 of the first vehicle 21 through the front opening 114 of the first conveyor 31 (in the direction of arrow W31 in the figure). When the excavated material is loaded through the front opening 114, the excavated material may locally rise in the front space of the storage space 60. In this case, the blade 52 is moved in the front-to-rear direction (in the direction of arrow X1 in the figure). This smooths the excavated material in the storage space 60 from above. In this way, the excavated material transported from the belt conveyor 9 is loaded into the first vehicle 21.

[0099] After a predetermined amount of excavated material is loaded onto the first vehicle 21, it is transported from the belt conveyor 9 to the second conveyor 32 via the first conveyor 31, and loaded into the storage space of the carrier of the second vehicle 22 through the opening on the front side of the second conveyor 32 (in the direction of arrows W21, W22, and W23 in the figure). If the excavated material locally rises within the storage space, the blade 52 is moved to level the excavated material within the storage space from above. In this way, the excavated material transported from the belt conveyor 9 is loaded onto the second vehicle 22.

[0100] After a predetermined amount of excavated material has been loaded onto the second vehicle 22, the excavated material is transported from the belt conveyor 9 to the third vehicle 23 via the first conveyor 31 and the second conveyor 32 (in the directions of arrows W13, W14, and W15 in the figure). Next, the excavated material is loaded into the storage space of the carrier of the third vehicle 23. If the excavated material locally rises within the storage space, the blade 52 is moved to level the excavated material within the storage space from above. In this way, the excavated material transported from the belt conveyor 9 is loaded onto the third vehicle 23. As a result of the above, the excavated material can be loaded onto the first vehicle 21, the second vehicle 22, and the third vehicle 23.

[0101] <Action and effect> As described above, the excavated material transport system 1 in this embodiment comprises a first vehicle 21 capable of traveling within the tunnel, a first conveyor 31 supported on the top of the first vehicle 21 and capable of transporting excavated material in a first transport direction V1 perpendicular to the up-down direction of the first vehicle 21, a second vehicle 22 connected to the first vehicle 21 so as to be able to swing freely, a second conveyor 32 supported on the top of the second vehicle 22 and capable of transporting excavated material in a second transport direction V2 perpendicular to the up-down direction of the second vehicle 22, and a moving device 40 capable of moving the first conveyor 31 and the second conveyor 32 relative to each other. According to this configuration, the first conveyor 31 and the second conveyor 32 can be moved relative to each other by the moving device 40. Therefore, even when the first vehicle 21 and the second vehicle 22 travel through a curved tunnel, the first conveyor 31 and the second conveyor 32 can be changed to positions that correspond to the curved part of the tunnel. Therefore, excavated materials can be transported efficiently even in tunnels that include curved tunnels.

[0102] In this embodiment, the moving device 40 includes a first longitudinal movement mechanism 120 capable of moving the first conveyor 31 in the longitudinal direction of the first conveyor 31, and a second longitudinal movement mechanism capable of moving the second conveyor 32 in the longitudinal direction of the second conveyor 32. According to this configuration, the first conveyor 31 can be moved in the longitudinal direction of the first conveyor 31 by the first longitudinal movement mechanism 120, and the second conveyor 32 can be moved in the longitudinal direction of the second conveyor 32 by the second longitudinal movement mechanism. Therefore, even when the first vehicle 21 and the second vehicle 22 travel in a curved tunnel, it is possible to absorb any deviation in the longitudinal position of the first conveyor 31 and the second conveyor 32. Therefore, it is possible to efficiently transport excavated materials even in tunnels that include curved tunnels.

[0103] In this embodiment, the moving device 40 includes a first left-right moving mechanism 130 capable of moving the first conveyor 31 in the width direction of the first vehicle 21, and a second left-right moving mechanism capable of moving the second conveyor 32 in the width direction of the second vehicle 22. According to this configuration, the first conveyor 31 can be moved in the width direction of the first vehicle 21 by the first left-right movement mechanism 130, and the second conveyor 32 can be moved in the width direction of the second vehicle 22 by the second left-right movement mechanism. Therefore, even when the first vehicle 21 and the second vehicle 22 travel through a curved tunnel, it is possible to absorb positional deviations of the first conveyor 31 and the second conveyor 32 relative to the width direction of the first vehicle 21 and the second vehicle 22. Therefore, excavated materials can be efficiently transported even in tunnels that include curved tunnels.

[0104] In this embodiment, the first inclination angle K1 between a plane perpendicular to the vertical direction of the first vehicle 21 and the transport surface along which the first conveyor 31 transports the excavated material in the first transport direction V1 is the same as the second inclination angle K2 between a plane perpendicular to the vertical direction of the second vehicle 22 and the transport surface along which the second conveyor 32 transports the excavated material in the second transport direction V2. According to this configuration, the excavated material can be transported from the first conveyor 31 to the second conveyor 32 more smoothly than when the first inclination angle K1 is an angle different from the second inclination angle K2.

[0105] In this embodiment, an upper end 32a of the second conveyor 32 on the first car 21 side is disposed lower than a lower end 31a of the first conveyor 31 on the second car 22 side. According to this configuration, when the first conveyor 31 and the second conveyor 32 are moved relative to each other, it is possible to prevent the first conveyor 31 and the second conveyor 32 from interfering with each other. In addition, when transporting excavated materials from the first conveyor 31 to the second conveyor 32, the falling of the excavated materials can be utilized to transport the excavated materials efficiently.

[0106] In this embodiment, the moving device 40 includes a first rotation mechanism 140 that can rotate the first conveyor 31 around a first axis D1 that extends along the vertical direction of the first vehicle 21, and a second rotation mechanism that can rotate the second conveyor 32 around a second axis D2 that extends along the vertical direction of the second vehicle 22. According to this configuration, the first rotation mechanism 140 rotates the first conveyor 31 about the first axis D1, and the second rotation mechanism rotates the second conveyor 32 about the second axis D2. Therefore, even when the first vehicle 21 and the second vehicle 22 travel through a curved tunnel, it is possible to absorb positional deviations in the rotational directions of the first conveyor 31 and the second conveyor 32. Therefore, it is possible to efficiently transport excavated materials even in tunnels that include curved tunnels.

[0107] In this embodiment, the moving device 40 includes first hydraulic cylinders 131L, 131R that connect the first vehicle 21 and the first conveyor 31 so that the first conveyor 31 can be moved in a direction perpendicular to the up-down direction of the first vehicle 21, and a second hydraulic cylinder that connects the second vehicle 22 and the second conveyor 32 so that the second conveyor 32 can be moved in a direction perpendicular to the up-down direction of the second vehicle 22. According to this configuration, the first hydraulic cylinders 131L, 131R can move the first conveyor 31 in a direction perpendicular to the up-down direction of the first vehicle 21, and the second hydraulic cylinder can move the second conveyor 32 in a direction perpendicular to the up-down direction of the second vehicle 22. Therefore, compared to when a drive mechanism such as a belt drive or chain drive is provided, the number of parts can be reduced and the configuration can be simplified.

[0108] In this embodiment, the first vehicle 21 and the second vehicle 22 are equipped with a blade 52 that can level the excavated material that has been loaded from above. According to this configuration, it is possible to prevent the excavated material from locally rising when loading the excavated material onto the first vehicle 21 and the second vehicle 22. Therefore, the excavated material can be efficiently loaded onto the first vehicle 21 and the second vehicle 22.

[0109] In this embodiment, the height H1 of the first vehicle 21 is greater than the height H2 of the second vehicle 22. With this configuration, it is easier to position the upper end 32a of the second conveyor 32 on the first vehicle 21 side lower than the lower end 31a of the first conveyor 31 on the second vehicle 22 side, compared to when the height H1 of the first vehicle 21 is equal to or lower than the height H2 of the second vehicle 22.

[0110] In this embodiment, the most downstream end 31b of the first conveyor 31 in the first conveying direction V1 is located behind the most upstream end 32b of the second conveyor 32 in the second conveying direction V2. According to this configuration, when the excavated material is transported from the first conveyor 31 to the second conveyor 32, the excavated material transported from the first conveyor 31 falls onto the second conveyor 32. Therefore, the falling of the excavated material can be utilized to transport the excavated material more efficiently.

[0111] In this embodiment, the first vehicle 21 and the second vehicle 22 are equipped with bogie mechanisms 53A, 53B that can rotate the wheels of the first vehicle 21 and the second vehicle 22 in a direction perpendicular to the up-down direction of the first vehicle 21 and the second vehicle 22. According to this configuration, the bogie mechanisms 53A, 53B can rotate the wheels of the first vehicle 21 and the second vehicle 22 in a direction perpendicular to the up-down direction of the first vehicle 21 and the second vehicle 22. Therefore, even when the first vehicle 21 and the second vehicle 22 travel through a curved tunnel, the wheels of the first vehicle 21 and the second vehicle 22 can rotate independently of each other in a direction perpendicular to the up-down direction of the first vehicle 21 and the second vehicle 22. Therefore, the first vehicle 21 and the second vehicle 22 can travel smoothly even in tunnels that include curved tunnels.

[0112] In this embodiment, the excavated material transportation system 1 in the tunnel comprises rails 90L, 90R that support the wheels of the first vehicle 21 and the second vehicle 22, and a plurality of covering plates 91, 92 that are separated by the rails 90L, 90R and are positioned above the upper ends of the rails 90L, 90R in the vertical direction. For example, if the multiple covering plates 91, 92 were positioned vertically lower than the upper ends of the rails 90L, 90R, the rails 90L, 90R could interfere with the travel of other vehicles, such as general vehicles, wheeled equipment transport vehicles, and personnel transport vehicles. In contrast, in this embodiment, the multiple covering plates 91, 92 are positioned vertically above the upper ends of the rails 90L, 90R, so that the rails 90L, 90R do not interfere with the travel of other vehicles. Therefore, travel of the first vehicle 21 and the second vehicle 22 on the rails 90L, 90R and travel of other vehicles on the covering plates 91, 92 can be achieved at the same time. Additionally, in this embodiment, the upper surfaces of the multiple covering plates 91, 92 are arranged on the same plane, which allows other vehicles to travel more smoothly on the multiple covering plates 91, 92 compared to when the upper surfaces of the multiple covering plates 91, 92 are arranged on different planes.

[0113] In this embodiment, the bottom wall 61 of the carrier 50 has a discharge hole for discharging the excavated material in the accommodation space 60 . This configuration employs a bottom dump system, allowing the excavated material in the storage space 60 to fall downward, enabling efficient soil discharge. In addition, even if a conveyor is supported on the top of the vehicle, this is preferable because it does not interfere with the discharge of the excavated material.

[0114] Second Embodiment In the first embodiment, an example was described in which the first longitudinal movement mechanism 120 includes longitudinal movement hydraulic cylinders 121L, 121R extending in the longitudinal direction of the support bottom plate 110 (see FIG. 4). In the second embodiment, as shown in FIG. 12, the first longitudinal movement mechanism 220 differs from the first embodiment in that it includes a rack-and-pinion mechanism 221 and a drive unit 222. The rack-and-pinion mechanism 221 is driven by the drive unit 222 to move the first conveyor 31 in the longitudinal direction of the first conveyor 31. In the following description, the same components as in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

[0115] Fig. 12 is an exploded perspective view of a first vehicle, a first conveyor, and a first moving mechanism according to the second embodiment, Fig. 13 is a cross-sectional view taken along line XIII-XIII in Fig. 12. 12, the rack and pinion mechanism 221 includes a rack mechanism 230 and a pinion mechanism 231. A pair of rack mechanisms 230 are provided at an interval in the short direction of the support bottom plate 110. The pair of rack mechanisms 230 are disposed at the same height position (position in the vehicle up-down direction). The rack mechanism 230 is connected to the first support side plate 111 and the second support side plate 112.

[0116] As shown in Fig. 13, the rack mechanism 230 includes a pin gear 232 and a gear support member 233. The gear support member 233 extends along the longitudinal direction of the first support side plate 111 and the second support side plate 112. In the cross-sectional view of Fig. 13, the gear support member 233 is L-shaped. The gear support member 233 is connected to the inner surfaces of the first support side plate 111 and the second support side plate 112. The pin gear 232 extends parallel to the lateral direction of the support bottom plate 110. A plurality of pin gears 232 are arranged at intervals in the longitudinal direction of the gear support member 233.

[0117] The pinion mechanism 231 includes a pinion gear 234 and a shaft 235. The pinion gear 234 meshes with the pin gear 232. A pair of pinion gears 234 is provided corresponding to the pair of rack mechanisms 230. The shaft 235 connects the pair of pinion gears 234. The shaft 235 extends parallel to the short direction of the support bottom plate 110. The shaft 235 is supported at a fixed position in the long direction of the conveyor frame 104.

[0118] 13, the shaft 235 and the driving device 222 are arranged between the top and bottom of the conveyor body 103. In the cross-sectional view of FIG. 13, the driving device 222 is arranged between the conveyor frames 104 in the short side direction.

[0119] The driving device 222 includes a motor 236 and a power transmission mechanism 237 . The motor 236 extends parallel to the shaft 235. The motor 236 has an output shaft that is rotatable about an axis that is parallel to the shaft 235. The output shaft of the motor 236 is connected to the shaft 235 via a power transmission mechanism 237.

[0120] The power transmission mechanism 237 is connected to the first conveyor second side plate 107 of the conveyor frame 104. The power transmission mechanism 237 transmits the rotational power of the output shaft of the motor 236 to the shaft 235. The rotation of the output shaft of the motor 236 causes the pinion gear 234 to rotate integrally with the shaft 235. The conveyor unit 100 moves in the direction of arrow B1 in FIG. 12 along the support frame 101 as the pinion gear 234 rotates and meshes with the multiple pin gears 232 due to the driving of the motor 236.

[0121] In the first embodiment, an example (see FIG. 4) has been described in which the first hydraulic cylinders 131L, 131R are provided as a pair with a gap between them in the width direction of the first vehicle 21. In the second embodiment, as shown in FIG. 12, the first hydraulic cylinder 131L is provided on only one side in the width direction of the first vehicle 21. The first hydraulic cylinder 131L connects the upper part of the left wall 64 of the carrier 50 and the support frame 101.

[0122] In the illustrated example, the first hydraulic cylinder 131L extends in the width direction of the first vehicle 21. A first longitudinal end (piston rod tip) of the first hydraulic cylinder 131L is connected to the vicinity of the longitudinal center of the first support side plate 111. The first longitudinal end of the first hydraulic cylinder 131L is rotatable about an axis that extends along the up-down direction at the connection portion of the first support side plate 111.

[0123] A second longitudinal end of the first hydraulic cylinder 131L (the end opposite the piston rod tip) is connected to the upper end of the left wall 64 of the carrier 50. The second longitudinal end of the first hydraulic cylinder 131L is rotatable about an axis extending in the up-down direction at the connection portion of the left wall 64.

[0124] The first hydraulic cylinder 131L is driven by hydraulic oil supplied from a hydraulic pump. The first conveyor 31 rotates about the first axis D1 by being driven by the first hydraulic cylinder 131L. For example, when the first hydraulic cylinder 131L extends beyond a predetermined length, the first conveyor 31 rotates about the first axis D1 in the direction of arrow R1. On the other hand, when the first hydraulic cylinder 131L retracts beyond the predetermined length, the first conveyor 31 rotates about the first axis D1 in the direction opposite to the direction of arrow R1. In this way, even when only one first hydraulic cylinder 131L is provided, the first conveyor 31 can rotate about the first axis D1.

[0125] <Action and effect> In the second embodiment, the first longitudinal movement mechanism 120 includes a rack and pinion mechanism 221 and a drive device 222. The rack and pinion mechanism 221 is driven by the drive device 222 to move the first conveyor 31 in the longitudinal direction of the first conveyor 31. According to this configuration, the rack and pinion mechanism 221 can move the first conveyor 31 in the longitudinal direction of the first conveyor 31. Therefore, even when the first vehicle 21 and the second vehicle 22 travel through a curved tunnel, it is possible to absorb any deviation in the longitudinal position of the first conveyor 31 and the second conveyor 32. Therefore, it is possible to efficiently transport excavated materials even in tunnels that include curved tunnels.

[0126] For example, if one hydraulic cylinder were to be placed on the center line of the support frame 101 in the lateral direction, a space for placing the hydraulic cylinder would be required between the support frame 101 and the conveyor unit 100 in the vertical direction, which could result in an increase in the height of the first conveyor 31. In contrast, in the second embodiment, by arranging the rack and pinion mechanism 221, no space for placing the hydraulic cylinder is required between the support frame 101 and the conveyor unit 100 in the vertical direction. Therefore, an increase in the height of the first conveyor 31 can be suppressed.

[0127] In the second embodiment, the first hydraulic cylinder 131L is provided on only one side of the first vehicle 21 in the width direction. According to this configuration, compared to the case where a pair of first hydraulic cylinders 131L, 131R is provided (see FIG. 4), the number of parts can be reduced and the configuration can be simplified.

[0128] <Other embodiments> In the above-described embodiment, the excavated material transport system in the tunnel includes a first conveyor capable of transporting the excavated material in a first transport direction perpendicular to the vertical direction of the first vehicle, and a second conveyor capable of transporting the excavated material in a second transport direction perpendicular to the vertical direction of the second vehicle. However, this is not limited to this. For example, the first conveyor may be capable of transporting the excavated material in a first transport direction that intersects obliquely with the vertical direction of the first vehicle. For example, the second conveyor may be capable of transporting the excavated material in a second transport direction that intersects obliquely with the vertical direction of the second vehicle. For example, the excavated material transport system in the tunnel may include a first conveyor capable of transporting the excavated material in a first transport direction that intersects with the vertical direction of the first vehicle, and a second conveyor capable of transporting the excavated material in a second transport direction that intersects with the vertical direction of the second vehicle. For example, the transport manner of the excavated material in the first conveyor and the second conveyor may be changed according to required specifications.

[0129] In the above-described embodiment, the moving device has been described as including a first longitudinal movement mechanism capable of moving the first conveyor in the longitudinal direction of the first conveyor and a second longitudinal movement mechanism capable of moving the second conveyor in the longitudinal direction of the second conveyor, but this is not limited thereto. For example, the moving device may not include the first longitudinal movement mechanism and the second longitudinal movement mechanism. For example, the moving device may include a movement mechanism capable of moving the first conveyor and the second conveyor in a direction intersecting the longitudinal direction of the first conveyor and the second conveyor. For example, the configuration of the moving device may be changed according to required specifications.

[0130] In the above-described embodiment, the moving device is described as including a first left-right moving mechanism capable of moving the first conveyor in the width direction of the first vehicle and a second left-right moving mechanism capable of moving the second conveyor in the width direction of the second vehicle, but this is not limited thereto. For example, the moving device may include a moving mechanism capable of moving the first conveyor and the second conveyor in a direction intersecting the width direction of the first vehicle and the second vehicle. For example, the configuration of the moving device can be changed according to required specifications.

[0131] In the above-described embodiment, the first inclination angle between a plane perpendicular to the vertical direction of the first vehicle and a conveying surface along which the first conveyor conveys the excavated material in the first conveying direction is the same as the second inclination angle between a plane perpendicular to the vertical direction of the second vehicle and a conveying surface along which the second conveyor conveys the excavated material in the second conveying direction. However, this is not limited to this. For example, the first inclination angle may be different from the second inclination angle. For example, the first inclination angle and the second inclination angle may be changed according to required specifications.

[0132] In the above-described embodiment, an example has been described in which the upper end of the second conveyor on the first car side is positioned lower than the lower end of the first conveyor on the second car side, but this is not limited to this. For example, the upper end of the second conveyor on the first car side does not have to be positioned lower than the lower end of the first conveyor on the second car side. For example, the upper end of the second conveyor on the first car side may be positioned higher than the lower end of the first conveyor on the second car side. For example, the arrangement of the first conveyor and the second conveyor can be changed depending on the required specifications.

[0133] In the above-described embodiment, the moving device has been described as including a first rotation mechanism that can rotate the first conveyor about a first axis that is aligned with the vertical direction of the first vehicle, and a second rotation mechanism that can rotate the second conveyor about a second axis that is aligned with the vertical direction of the second vehicle, but this is not limited to this. For example, the moving device may not include the first rotation mechanism and the second rotation mechanism. For example, the moving device may include a moving mechanism that can move the first conveyor and the second conveyor in a tangential direction (a predetermined direction) to the rotation direction of the first conveyor and the second conveyor. For example, the configuration of the moving device may be changed according to required specifications.

[0134] In the above-described embodiment, the moving device has been described as including a first hydraulic cylinder that connects the first vehicle and the first conveyor so that the first conveyor can move in a direction perpendicular to the up-down direction of the first vehicle, and a second hydraulic cylinder that connects the second vehicle and the second conveyor so that the second conveyor can move in a direction perpendicular to the up-down direction of the second vehicle. However, this is not limited to this. For example, the moving device may not include the first hydraulic cylinder and the second hydraulic cylinder. For example, the moving device may include a drive mechanism such as a belt drive or a chain drive. For example, the configuration of the moving device may be changed depending on required specifications.

[0135] In the above-described embodiment, the first vehicle and the second vehicle are provided with a blade that can level the loaded excavated material from above, but this is not limited to this. For example, the first vehicle and the second vehicle do not need to be provided with a blade. For example, the configuration of the first vehicle and the second vehicle can be changed according to required specifications.

[0136] In the above-described embodiment, an example has been described in which the height of the first vehicle is higher than the height of the second vehicle, but this is not limited to this. For example, the height of the first vehicle does not have to be higher than the height of the second vehicle. For example, the height of the first vehicle may be equal to or lower than the height of the second vehicle. For example, the heights of the first vehicle and the second vehicle can be changed according to required specifications.

[0137] In the above-described embodiment, an example has been described in which the most downstream end of the first conveyor in the first conveying direction is located behind the most upstream end of the second conveyor in the second conveying direction, but this is not limited to this. For example, the most downstream end of the first conveyor in the first conveying direction does not have to be located behind the most upstream end of the second conveyor in the second conveying direction. For example, the most downstream end of the first conveyor in the first conveying direction may be located ahead of the most upstream end of the second conveyor in the second conveying direction. For example, the arrangement of the first conveyor and the second conveyor can be changed depending on required specifications.

[0138] In the above-described embodiment, the first and second vehicles are described as being equipped with bogie mechanisms that allow the wheels of the first and second vehicles to rotate in a direction perpendicular to the up-down direction of the first and second vehicles, but this is not limited to this. For example, the first and second vehicles may not be equipped with bogie mechanisms. For example, the configuration of the first and second vehicles may be changed depending on the required specifications.

[0139] In the above-described embodiment, the excavated material transport system in the tunnel has been described as including a rail that supports the wheels of the first and second vehicles, and a plurality of lining plates that are separated by the rail and are arranged above the upper end of the rail in the vertical direction, but this is not limited to this. For example, the excavated material transport system in the tunnel does not have to include a rail and a plurality of lining plates. For example, the configuration of the excavated material transport system in the tunnel can be changed according to the required specifications.

[0140] In the above-described embodiment, an example has been described in which the multiple covering plates are arranged above the upper end of the rail in the vertical direction, but this is not limited thereto. For example, the multiple covering plates do not have to be arranged above the upper end of the rail in the vertical direction. For example, the multiple covering plates may be arranged lower than the upper end of the rail in the vertical direction. For example, the arrangement of the multiple covering plates relative to the upper end of the rail in the vertical direction can be changed according to required specifications.

[0141] In the above-described embodiment, an example has been described in which the upper surfaces of the multiple lining plates are arranged on the same plane, but this is not limited to this. For example, the upper surfaces of the multiple lining plates do not have to be arranged on the same plane. For example, the upper surfaces of the multiple lining plates may be arranged on different planes. For example, the arrangement of the upper surfaces of the multiple lining plates can be changed depending on the required specifications.

[0142] In the above-described embodiment, an example has been described in which the first group of transport vehicles is composed of a total of seven vehicles, numbered from vehicle 1 to vehicle 7, but this is not limited to this. For example, the first group of transport vehicles may be composed of six or fewer vehicles or eight or more vehicles. For example, the number of vehicles comprising the first group of transport vehicles can be changed depending on the required specifications.

[0143] In the above-described embodiment, the second group of transport vehicles is described as being composed of a total of three vehicles, namely, the first vehicle, the second vehicle, and the third vehicle. However, this is not limiting. For example, the second group of transport vehicles may be composed of only the first vehicle and the second vehicle, or may be composed of four or more vehicles, including a fourth vehicle or more. For example, the number of vehicles comprising the second group of transport vehicles can be changed depending on the required specifications.

[0144] In the above-described embodiment, an example has been described in which the second vehicle has a second pivot member provided on the front side of the carrier to rotatably support the second conveyor, but this is not limited thereto. For example, the second vehicle may have a second pivot member provided on the rear side of the carrier to rotatably support the second conveyor. For example, the second pivot member may be disposed on the same side in the front-to-rear direction as the pivot member of the first vehicle. For example, the arrangement of the pivot members in the first and second vehicles can be changed according to required specifications.

[0145] Although the embodiments of the present invention have been described above, the present invention is not limited to these, and additions, omissions, substitutions, and other modifications to the configuration are possible within the scope of the spirit of the present invention, and the above-described embodiments can also be combined as appropriate. [Explanation of symbols]

[0146] 1...excavation material transportation system, 21...first vehicle, 22...second vehicle, 31...first conveyor, 31a...lower end of first conveyor on the second vehicle side, 31b...downstream end of first conveyor in the first transport direction, 32...second conveyor, 32a...upper end of second conveyor on the first vehicle side, 32b...upstream end of second conveyor in the second transport direction, 40, 240...moving device, 52...blade, 53A...front wheel bogie mechanism (bogie mechanism), 53B...rear wheel bogie mechanism (bogie mechanism), 85L, 85R...front front wheels (wheels), 86L, 86R...rear front wheels (wheels), 87L, 8 7R...front rear wheels (wheels), 88L, 88R...rear rear wheels (wheels), 90...rail, 91...center block (covering plate), 92L, 92R...side blocks (covering plates), 120, 220...first longitudinal movement mechanism (second longitudinal movement mechanism), 130...first left-right movement mechanism (second left-right movement mechanism), 131L, 131R...first hydraulic cylinder (second hydraulic cylinder), 140...first rotation mechanism, D1...first axis, D2...second axis, H1...height of first vehicle, H2...height of second vehicle, K1...first tilt angle, K2...second tilt angle, V1...first conveying direction, V2...second conveying direction

Claims

1. a first vehicle capable of traveling within the tunnel; a first conveyor supported on an upper portion of the first vehicle and capable of transporting excavated material in a first transport direction intersecting with the up-down direction of the first vehicle; a second vehicle pivotally connected to the first vehicle; a second conveyor supported on an upper portion of the second vehicle and capable of transporting the excavated material in a second transport direction intersecting the up-and-down direction of the second vehicle; a moving device capable of relatively moving the first conveyor and the second conveyor, The moving device is a first rotation mechanism that can rotate the first conveyor about a first axis that extends along the up-down direction of the first vehicle; a second rotation mechanism that can rotate the second conveyor about a second axis that extends along the vertical direction of the second vehicle; a first left-right movement mechanism that is driven by a hydraulic cylinder to move the first conveyor in the width direction of the first vehicle; a second left-right movement mechanism that is capable of moving the second conveyor in the width direction of the second vehicle by driving a hydraulic cylinder; Excavation material transport system inside the tunnel.

2. The moving device is a first longitudinal movement mechanism capable of moving the first conveyor in a longitudinal direction of the first conveyor; a second longitudinal movement mechanism that can move the second conveyor in the longitudinal direction of the second conveyor; 2. A tunnel excavation transport system according to claim 1.

3. A first inclination angle formed by a plane perpendicular to the up-down direction of the first vehicle and a conveying surface along which the first conveyor conveys the excavated material in the first conveying direction is the same as a second inclination angle formed by a plane perpendicular to the up-down direction of the second vehicle and a conveying surface along which the second conveyor conveys the excavated material in the second conveying direction.

3. A tunnel excavation material transport system according to claim 1 or 2.

4. An upper end of the second conveyor on the first vehicle side is disposed below a lower end of the first conveyor on the second vehicle side. A system for transporting excavated material in a tunnel according to any one of claims 1 to 3.

5. The moving device is a first hydraulic cylinder connecting the first vehicle and the first conveyor so as to move the first conveyor in a direction perpendicular to the up-down direction of the first vehicle; a second hydraulic cylinder that connects the second vehicle and the second conveyor so as to move the second conveyor in a direction perpendicular to the up-down direction of the second vehicle; A system for transporting excavated material in a tunnel according to any one of claims 1 to 4.

6. The first vehicle and the second vehicle are equipped with blades capable of leveling the loaded excavated material from above. A system for transporting excavated material in a tunnel according to any one of claims 1 to 5.

7. The height of the first vehicle is greater than the height of the second vehicle. A system for transporting excavated material in a tunnel according to any one of claims 1 to 6.

8. The most downstream end of the first conveyor in the first conveying direction is disposed rearward of the most upstream end of the second conveyor in the second conveying direction. A system for transporting excavated material in a tunnel according to any one of claims 1 to 7.

9. The first vehicle and the second vehicle are provided with a bogie mechanism that can rotate wheels of the first vehicle and the second vehicle in a direction perpendicular to the up-down direction of the first vehicle and the second vehicle. A system for transporting excavated material in a tunnel according to any one of claims 1 to 8.

10. a rail supporting wheels of the first vehicle and the second vehicle; A plurality of covering plates are partitioned by the rails and arranged above the upper end of the rails in the vertical direction. A system for transporting excavated material in a tunnel according to any one of claims 1 to 9.

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