Underground excavation device

Abstract

An underground excavation device (1) is provided with a body (2), a rear support (5), and a position adjustment mechanism (6). The body (2) has a front body part (11) and a rear body part (12). The front body part (11) includes a cutter head (21) provided with a plurality of disc cutters (211). The rear body part (12) includes a gripper part (30) for obtaining a reaction force during the execution of excavation, and is disposed behind the front body part (11). The rear support (5) is disposed behind the rear body part (12) so as to be movable in the up-down direction relative to the body (2), and supports the body (2). The position adjustment mechanism (6) adjusts the position of the rear support (5) relative to the body (2).

Description

Underground drilling rig

[0001] The present disclosure relates to underground drilling rigs.

[0002] The tunnel boring device has a main beam arranged in the fore-and-aft direction, a cutter head arranged at the front of the main beam via a cutter head support, a gripper arranged at the rear of the main beam, and a thrust jack arranged between the cutter head support and the gripper frame (see, for example, Patent Document 1).

[0003] The tunnel boring device is provided with a front support for supporting the cutter head support against the tunnel wall, and a rear support provided on the main beam behind the gripper for supporting the rear of the device.

[0004] The tunnel boring device is fixed to the tunnel tunnel using the gripper, the thrust cylinder is extended, and the cutter head is pressed against the face (surface to be excavated) and rotated. This causes the disc cutter to crush the rock at the face and perform excavation. Next, the rear support is extended downward and touches the tunnel tunnel to support the main beam on the ground, after which the gripper is released from its fixation and the thrust cylinder is retracted, causing the gripper to move toward the cutter head (front). Next, the tunnel boring device is fixed to the tunnel tunnel using the gripper, the rear support is retracted to release support for the main beam, and the thrust cylinder is extended to perform excavation. By repeating these operations, the tunnel boring device can move forward while excavating.

[0005] Japanese Patent Application Publication No. 10-306691

[0006] Here, the rear support is configured to be symmetrical about the longitudinal axis of the tunnel boring machine, so that when the axis of the tunnel boring machine and the central axis of the tunnel coincide in the left-right direction, the contact state of the rear support with the tunnel is symmetrical about the central axis of the tunnel, and the rear support can properly support the main beam in the tunnel.

[0007] However, when the curve radius of the tunnel curved section is small, the rear support's contact with the ground is not symmetrical with respect to the central axis of the tunnel, and the main beam cannot be sufficiently supported.

[0008] The present disclosure provides an underground excavation device that can properly ground a rear support on a tunnel when constructing a tunnel in a sharp curve.

[0009] The underground drilling equipment according to the present disclosure comprises a main body, a rear support, and a position adjustment mechanism. The main body has a forward section and a rear section. The forward section includes a cutter head provided with a plurality of cutters. The rear section includes a gripper section for obtaining a reaction force when drilling, and is disposed aft of the forward section. The rear support is disposed aft of the rear section and supports the main body. The position adjustment mechanism adjusts the position of the rear support relative to the main body. (Effects of the Invention)

[0010] According to the present disclosure, it is possible to provide an underground excavation device that can properly ground a rear support to a tunnel when constructing a tunnel in a sharp curve.

[0011] 8 is a perspective view of an underground drilling rig according to an embodiment of the present disclosure; FIG. 9 is a side view of an underground drilling rig according to an embodiment of the present disclosure; FIG. 10 is a partial perspective view of an underground drilling rig according to an embodiment of the present disclosure, viewed from the rear side; FIG. 11 is a side cross-sectional view showing a contracted state of a left-side rear support of an underground drilling rig according to an embodiment of the present disclosure; FIG. 12 is a side cross-sectional view showing an extended state of a left-side rear support of an underground drilling rig according to an embodiment of the present disclosure; FIG. 13 is an enlarged perspective view of the vicinity of a position adjustment mechanism of an underground drilling rig according to an embodiment of the present disclosure; FIG. 14 is a perspective view showing a pair of rear supports and a position adjustment mechanism of an underground drilling rig according to an embodiment of the present disclosure; FIG. 15 is a cross-sectional view taken along the arrows D-D' in FIG. 6; FIG. 16 is a cross-sectional view taken along the arrows E-E' in FIG. 6; FIG. 17 is a plan view showing a pair of rear supports and a position adjustment mechanism of an underground drilling rig according to an embodiment of the present disclosure; FIG. 18 is a cross-sectional view taken along the arrows F-F' in FIG. 19; FIG. 19 is a perspective view showing a belt conveyor in the vicinity of a position adjustment mechanism of an underground drilling rig according to an embodiment of the present disclosure; FIG. 19 is a rear view illustrating the position of the rear supports when a straight tunnel is excavated using an underground drilling rig according to an embodiment of the present disclosure; FIG. 19 is a plan view illustrating the position of the rear supports when a curved tunnel is excavated using an underground drilling rig according to an embodiment of the present disclosure;

[0012] An underground drilling rig according to an embodiment of the present disclosure will be described with reference to the drawings.

[0013] The underground excavation equipment of this embodiment is a so-called open-type TBM (tunnel boring machine), and can be used for tunnel construction by excavating hard rock.

[0014] (Overall Configuration of Underground Excavation Apparatus) Fig. 1 is a perspective view showing an underground excavation apparatus 1 of this embodiment. Fig. 2 is a side view showing the underground excavation apparatus 1 of this embodiment.

[0015] The underground excavation device 1 of this embodiment performs excavation by rotating the cutter head 21 while being supported on the tunnel inner wall by the gripper unit 30.

[0016] The underground excavation equipment 1 of this embodiment has a main body 2, a platform 3, a work platform 4, a rear support 5, a position adjustment mechanism 6, and a belt conveyor 7.

[0017] The main body 2 includes a forward section 11, aft section 12, a connection section 13, and a main beam 14. As shown in FIG. 1 , the forward section 11 has a cutter head 21 at its front end and is used to excavate rock. The aft section 12 is disposed aft of the forward section 11 and can be supported on the tunnel inner wall by a gripper unit 30. In the figure, the longitudinal direction is indicated by A, the forward direction is indicated by arrow A1, and the aft direction is indicated by arrow A2. Note that arrow A indicates the longitudinal direction when the forward section 11 is not bent relative to the aft section 12 and is disposed linearly. Arrow A can also be considered the direction in which the main beam 14 extends. Furthermore, arrow B shown in the figure indicates the left-right direction (width direction), which is perpendicular to the forward-left direction A and is horizontal. Within the left-right direction B, B1 indicates the leftward direction facing the forward direction A1, and B2 indicates the rightward direction facing the forward direction A1.

[0018] The connection section 13 flexibly connects the forward section 11 to the aft section 12. The connection section 13 has a plurality of thrust cylinders 13a, one end of each thrust cylinder 13a being rotatably connected to the forward section 11 and the other end being rotatably connected to the aft section 12.

[0019] The main beam 14 is connected to the forward section 11 and extends rearward from the forward section 11. The main beam 14 supports the rear section 12 so that it can slide along the longitudinal direction A. Figure 3 is a partial perspective view of the underground drilling device 1 as seen from the rear side. As shown in Figures 2 and 3, the main beam 14 passes inside the rear section 12 and extends rearward.

[0020] 1 and 2, the platform 3 is rotatably attached to the rear end of the main beam 14. The workbench 4 is provided above the platform 3 for attaching wire mesh to the inner wall of the tunnel after excavation.

[0021] The rear support 5 supports the main body 2. The rear support 5 extends downward and supports the main body 2 while in contact with the ground. A position adjustment mechanism 6 adjusts the position of the rear support 5 relative to the main body 2. The belt conveyor 7 is installed from the forward section 11, passing under the aft section 12 and the cradle 3 to the rear, and transports rocks, earth, sand, etc. excavated by the cutter head 21 to the rear.

[0022] Although not shown, a vehicle is connected to the rear of the platform 3 and is equipped with a control device for driving the cutter head 21, belt conveyor 7, multiple thrust cylinders 13a, gripper unit 30, etc., a power supply unit, a hydraulic system, etc.

[0023] (Fore fuselage section 11) As shown in Fig. 1, the forward fuselage section 11 has a cutter head 21, a cutter head support 22 (see Fig. 2), a vertical support 23, a pair of side supports 24 (only the left side is shown in Fig. 1), and a roof support 25. Note that in Fig. 2, in order to show the cutter head support 22, the rear portion of the left side support 24, the rear portion of the left side of the roof support 25, and the left side of the vertical support are omitted.

[0024] The cutter head 21 is provided at the front end of the forward section 11 and is rotatable relative to the cutter head support 22. As shown in Fig. 1, the cutter head 21 has a plurality of disc cutters 211 (an example of a cutter) provided on the surface on the excavation side. Rocks excavated by the disc cutters 211 are taken into the cutter head 21 by a bucket 212.

[0025] 2, the cutter head support 22 is disposed behind the cutter head 21. The cutter head support 22 supports the cutter head 21 so that it can rotate.

[0026] The vertical support 23, the pair of side supports 24, and the roof support 25 are attached to the cutter head support 22 and are arranged to surround the periphery of the cutter head support 22. The vertical support 23, the pair of side supports 24, and the roof support 25 are provided to support the cutter head support 22 against the tunnel wall to stabilize it during excavation, and to protect the cutter head support 22 from rocks falling from the tunnel wall, etc.

[0027] The vertical support 23 is disposed below the cutter head support 22. The pair of side supports 24 are disposed on both sides in the width direction of the cutter head support 22. The roof support 25 is disposed above the cutter head support 22.

[0028] The vertical support 23, the pair of side supports 24, and the roof support 25 are configured to be movable in a direction toward or away from the cutter head support 22. That is, the vertical support 23 and the roof support 25 are movable in the up and down direction relative to the cutter head support 22. The pair of side supports 24 are movable outward or inward in the left-right direction B relative to the cutter head support 22.

[0029] (Rear Section 12) As shown in Fig. 2, the rear section 12 has a gripper unit 30 and a gripper carrier 31. The gripper unit 30 protrudes outward from the gripper carrier 31 and presses against the inner wall of the tunnel during excavation to support the rear section 12 against the inner wall of the tunnel.

[0030] The gripper unit 30 has a pair of side grippers 32 (only the left side is shown), a lower gripper 33, and an upper gripper 34.

[0031] The side grippers 32 are provided on the left and right portions of the gripper carrier 31. The side grippers 32 are moved outward and inward in the left-right direction B by hydraulic cylinders provided in the gripper carrier 31.

[0032] The lower gripper 33 is provided in the lower portion of the gripper carrier 31. The lower gripper 33 moves up and down by extension and contraction of a hydraulic cylinder provided in the gripper carrier 31.

[0033] The upper gripper 34 is provided in the upper portion of the gripper carrier 31. The upper gripper 34 moves up and down by the extension and contraction of a hydraulic cylinder provided in the gripper carrier 31.

[0034] (Rear Support 5) As shown in Fig. 3, the rear support 5 is attached so that its position can be adjusted relative to the main beam 14 via a position adjustment mechanism 6. The rear support 5 has a left rear support portion 5a and a right rear support portion 5b. The left rear support portion 5a and the right rear support portion 5b are arranged on either side of the main beam 14. The left rear support portion 5a and the right rear support portion 5b are configured symmetrically.

[0035] The left rear support portion 5a and the right rear support portion 5b have the same configuration, so the left rear support portion 5a will be used as an example for explanation. Figure 4A is a side cross-sectional view of the left rear support portion 5a in a contracted state. Figure 4B is a side cross-sectional view of the left rear support portion 5a in an extended state.

[0036] The left rear support portion 5a has a shoe 41 and a rear cylinder 42. The shoe 41 is disposed at the lower end of a rod portion 44 of the rear cylinder 42. The shoe 41 is in contact with the tunnel. A contact surface 41a (see FIG. 3) of the shoe 41 is curved to fit the inner circumferential surface of the tunnel. As shown in FIGS. 4A and 4B, the rear cylinder 42 has a cylinder portion 43 and a rod portion 44. The cylinder portion 43 is attached to a position adjustment mechanism 6, which will be described later.

[0037] The cylinder portion 43 has a cylinder tube portion 45 and a cylinder interior 46. The cylinder tube portion 45 is cylindrical. The cylinder tube portion 45 has a closed upper end 45a and an open lower end. The cylinder tube portion 45 has a space inside. The cylinder interior 46 is disposed inside the cylinder tube portion 45. The cylinder interior 46 extends downward from the upper end 45a of the cylinder tube portion 45. The lower end 46a of the cylinder interior 46 protrudes outward toward the inner circumferential surface of the inner rod 47 described below.

[0038] The rod portion 44 has an inner rod 47, an outer rod 48, and a connecting member 49. The inner rod 47 is disposed inside the cylinder portion 43. The inner rod 47 is generally cylindrical. The inner rod 47 is disposed outside the cylinder interior 46. An upper end 47a of the inner rod 47 protrudes inward toward the outer peripheral surface of the cylinder interior 46. A lower end 47b of the inner rod 47 is closed below the cylinder interior 46.

[0039] The outer rod 48 is disposed between the inner rod 47 and the cylinder tube portion 45. The outer rod 48 is cylindrical. The upper end of the outer rod 48 is open. The lower end of the outer rod 48 is closed by a connecting member 49. The lower end 47b of the inner rod 47 is connected to the upper surface of the connecting member 49. The shoe 41 is attached to the connecting member 49 via a connecting pin 49a.

[0040] When hydraulic oil is supplied to a space S1 (see FIG. 4B) below the lower end 46a, which is the space between the cylinder interior 46 and the inner rod 47, the rear cylinder 42 expands and the shoe 41 moves downward. When hydraulic oil is supplied to a space S2 (see FIG. 4A) above the lower end 46a, which is the space between the cylinder interior 46 and the inner rod 47, the rear cylinder 42 contracts and the shoe 41 moves upward.

[0041] In this embodiment, the rod portions 44 of the left rear support portion 5a and the right rear support portion 5b have a double-tube structure of the inner rod 47 and the outer rod 48, thereby improving durability against horizontal forces.

[0042] (Position adjustment mechanism 6) Figure 5 is an enlarged perspective view of the vicinity of the position adjustment mechanism 6 of the underground excavation rig 1 of this embodiment. As shown in Figures 1 and 2, a side work platform 8 is arranged outside the rear cylinder 42 of each of the left rear support part 5a and the right rear support part 5b, but is omitted in Figure 5.

[0043] The position adjustment mechanism 6 has a front-rear movement mechanism 50, a rotation mechanism 60, and a left-right movement mechanism 70. The front-rear movement mechanism 50 moves the rear support 5 in the front-rear direction relative to the main body 2 (see arrow A). The rotation mechanism 60 rotates the rear support 5 relative to the main body 2 around a rotation axis along the up-down direction (see arrow C). The left-right movement mechanism 70 moves the rear support 5 in the left-right direction relative to the main body 2 (see arrow B). Figure 5 shows a state in which the rear support 5 has rotated relative to the main beam 14 so that the left rear support portion 5a is positioned further forward than the right rear support portion 5b, and has moved leftward in the direction B1 relative to the main beam 14.

[0044] (Forward / backward movement mechanism 50) Fig. 6 is a perspective view showing the rear support 5 and the position adjustment mechanism 6. Fig. 7 is a cross-sectional view taken along the line DD' in Fig. 6 .

[0045] 6 and 7 , the front-rear movement mechanism 50 has a front-rear movement frame 51, a pair of front-rear movement cylinders 52 (an example of a front-rear movement actuator), and a pair of guide rails 53. The front-rear movement frame 51 is supported by the main beam 14 so as to be movable in the front-rear direction A along the main beam 14. The front-rear movement cylinders 52 are connected to the main beam 14 and the front-rear movement frame 51, and move the front-rear movement frame 51 in the front-rear direction.

[0046] As shown in Figure 6, the forward / backward moving frame 51 has an upper frame portion 54 and a lower frame portion 55. The upper frame portion 54 is attached to the main beam 14. The lower frame portion 55 is disposed below the upper frame portion 54. The lower frame portion 55 rotatably supports a rotating frame 61, which will be described later.

[0047] As shown in FIG. 6 , the upper frame portion 54 has a front wall 56, a rear wall 57, and a pair of side walls 58. The front wall 56 is disposed perpendicular to the front-to-rear direction A. The rear wall 57 is disposed rearward of the front wall 56. The rear wall 57 is disposed perpendicular to the front-to-rear direction A. The rear wall 57 faces the front wall 56 in the front-to-rear direction A. Of the pair of side walls 58, the side wall 58 on the left side in the direction B1 connects the end of the front wall 56 on the left side in the direction B1 to the end of the rear wall 57 on the left side in the direction B1. Of the pair of side walls 58, the side wall 58 on the right side in the direction B2 connects the end of the front wall 56 on the right side in the direction B2 to the end of the rear wall 57 on the right side in the direction B2. The pair of side walls 58 extend upward beyond the front wall 56 and the rear wall 57. A guide fitting portion 59 is disposed on the inside of each of the portions of the pair of side walls 58 that protrude upward from the front wall 56 and the rear wall 57. The guide fitting portion 59 is formed in a concave shape on the inner surface of the side wall 58.

[0048] As shown in FIG. 7 , the main beam 14 has a pair of side surfaces 14a and a bottom surface 14b. The pair of side surfaces 14a are surfaces of the main beam 14 facing the left direction B1 and the right direction B2. The bottom surface 14b connects the lower ends of the pair of side surfaces 14a. A guide rail 53 is disposed on each of the pair of side surfaces 14a. The guide rails 53 are disposed along the front-rear direction A. The guide fitting portion 59 of the side wall 58 on the left direction B1 side fits into the guide rail 53 on the left direction B1 side, and the guide fitting portion 59 of the side wall 58 on the right direction B2 side fits into the guide rail 53 on the right direction B2 side.

[0049] The lower frame portion 55 is generally plate-shaped and is disposed at the lower ends of a front wall 56, a rear wall 57, and a pair of side walls 58, as shown in Fig. 6. A cylindrical portion 551 is disposed in the center of the lower frame portion 55, and supports a rotation pin 62 of a rotation mechanism 60, which will be described later.

[0050] The front-rear movement cylinders 52 move the front-rear movement frame 51 in the front-rear direction A along the guide rails 53. As shown in FIG. 6 , the pair of front-rear movement cylinders 52 are arranged side by side in the left-right direction B. Each front-rear movement cylinder 52 has a cylinder portion 52a and a rod portion 52b inserted into the cylinder portion 52a and moving relative to the cylinder portion 52a. In each front-rear movement cylinder 52, the cylinder portion 52a is arranged in front of the rod portion 52b so that the rod portion 52b extends rearward relative to the cylinder portion 52a. As shown in FIG. 5 , the front end of the cylinder portion 52a of each front-rear movement cylinder 52 is supported on the bottom surface 14b of the main beam 14 so as to be rotatable about an axis in the left-right direction B. The rear end of the rod portion 52b of each front-rear movement cylinder 52 is connected to the front wall 56 of the front-rear movement frame 51 so as to be rotatable about an axis in the left-right direction B.

[0051] As a result, when the pair of front-rear moving cylinders 52 contract, the front-rear moving frame 51 moves in the forward direction A1 relative to the main beam 14. Conversely, when the pair of front-rear moving cylinders 52 extend, the front-rear moving frame 51 moves in the rearward direction A2 relative to the main beam 14.

[0052] (Rotation Mechanism 60) As shown in Fig. 5, the rotation mechanism 60 is supported by the front-rear moving frame 51. Fig. 8 is a cross-sectional view taken along the line EE' in Fig. 6 .

[0053] 7 and 8, the rotation mechanism 60 has a rotation frame 61, a rotation pin 62, and a rotation cylinder 63 (an example of a rotation actuator). The rotation frame 61 rotates about an axis along the up-down direction relative to the main beam 14. The rotation pin 62 rotatably supports the rotation frame 61 on the forward-backward moving frame 51. The rotation cylinder 63 rotates the rotation pin 62.

[0054] As shown in FIG. 8 , the rotating frame 61 has an upper surface 64, a front wall 65, and a rear wall 66. The upper surface 64 is disposed below the lower frame 55 of the forward / rearward moving frame 51. The upper surface 64 is generally plate-shaped. The upper surface 64 is disposed horizontally. A through hole is formed in the upper surface 64 in the vertical direction. The upper surface 64 has an edge 64a around the through hole. A through hole is formed in the lower frame 55 in the vertical direction, facing the through hole in the upper surface 64. A cylindrical portion 551 that rotatably supports the rotation pin 62 is disposed in the through hole in the lower frame 55. The cylindrical portion 551 is disposed so that its central axis is aligned in the vertical direction. As shown in FIG. 7 , a liner 64b is disposed above the upper surface 64 and slides against the lower frame 55.

[0055] As shown in Fig. 8, the front wall portion 65 extends downward from the front end of the upper surface portion 64. As shown in Fig. 5, a front guide fitting portion 65a that fits with the front left and right guide rails 72 (described later) is disposed on the rear surface of the front wall portion 65. The front guide fitting portion 65a is formed in a concave shape facing forward, and the front left and right guide rails 72 fit into it.

[0056] As shown in Fig. 8, the rear wall portion 66 extends downward from the rear end of the upper surface portion 64. The rear wall portion 66 faces the front wall portion 65 in the front-rear direction A. As shown in Fig. 6, a rear guide fitting portion 66a that fits with rear left and right guide rails 73 (described later) is disposed on the front surface of the rear wall portion 66. The rear guide fitting portion 66a is formed in a concave shape facing rearward, and the rear left and right guide rails 73 fit into it.

[0057] As shown in FIG. 8 , the rotation pin 62 is disposed so as to pass through the tubular portion 551 of the lower frame portion 55 and the inside of the edge portion 64 a of the upper surface portion 64. The rotation pin 62 is disposed at the center of the longitudinally movable frame 51 in the left-right direction B. The rotation pin 62 is disposed at the center of the main beam 14 in the left-right direction B. As shown in FIG. 8 , the rotation pin 62 has a pin body 67 and a cover portion 68. The pin body 67 is cylindrical. The pin body 67 passes through the tubular portion 551 of the lower frame portion 55 and the inside of the edge portion 64 a of the upper surface portion 64. A portion of the lower end 67 a of the pin body 67 protrudes outward. The outward protruding portion of the lower end 67 a is disposed below the edge portion 64 a. The outward protruding portion of the lower end 67 a and the edge portion 64 a are fixed to each other with bolts or the like. The cover portion 68 is fixed to the upper end of the pin body 67 with bolts or the like. The lid portion 68 extends outward beyond the upper end of the pin body 67. The lid portion 68 is disposed above the cylindrical portion 551.

[0058] FIG. 9 is a plan view showing the rear support 5 and the position adjustment mechanism 6. In FIG. 9, the outline of the main beam 14 is indicated by a two-dot chain line. The rotation cylinder 63 is connected to the upper frame portion 54 and the cover portion 68 of the forward / rearward moving frame 51. The rotation cylinder 63 has a cylinder portion 63a and a rod portion 63b inserted into the cylinder portion 63a and moving relative to the cylinder portion 63a. The rotation cylinder 63 is arranged along the left-right direction. The right end of the cylinder portion 63a is connected to the side wall 58 on the rightward B2 side so as to be rotatable about an axis extending in the vertical direction. The tip of the rod portion 63b is connected to the cover portion 68 so as to be rotatable about an axis extending in the vertical direction. A connecting portion 63c of the tip of the rod portion 63b, which is connected to the cover portion 68, is offset in the forward direction A1 from the center axis 62a of the rotation pin 62.

[0059] As a result, when the rotation cylinder 63 extends, the rotation pin 62 rotates counterclockwise around the central axis 62a in a plan view, and the rotation frame 61 fixed to the rotation pin 62 also rotates counterclockwise (see arrow C1). The rotation of the rotation frame 61 also rotates the left-right moving frame 71, which will be described later, and also rotates the left rear support part 5a and the right rear support part 5b arranged at both ends of the left-right moving frame 71. In Figure 9, the left rear support part 5a and the right rear support part 5b rotated in the direction of arrow C1 are shown by dashed lines.

[0060] On the other hand, when the rotation cylinder 63 contracts, the rotation pin 62 rotates clockwise around the central axis 62a in a plan view, and the rotation frame 61 fixed to the rotation pin 62 also rotates clockwise (see arrow C2). The rotation of the rotation frame 61 also rotates the left-right moving frame 71, which will be described later, and also rotates the left rear support part 5a and the right rear support part 5b arranged at both ends of the left-right moving frame 71. In Figure 9, the left rear support part 5a and the right rear support part 5b rotated in the direction of arrow C2 are shown by dotted lines.

[0061] (Left-right movement mechanism 70) As shown in Figures 5, 6, and 8, the left-right movement mechanism 70 has a left-right movement frame 71, front left-right guide rails 72, rear left-right guide rails 73, a rack 74, a pinion 75, a motor 76 (an example of an actuator for left-right movement), and a motor support frame 77.

[0062] As shown in Fig. 6, the left-right moving frame 71 is formed along the left-right direction B. The left-right moving frame 71 has a substantially rectangular shape. As shown in Fig. 8, the left-right moving frame 71 is disposed below the rotating frame 61 and sandwiched between the front wall 65 and rear wall 66 of the rotating frame 61. The cylinder 43 of the left rear support part 5a is fixed to the left end of the left-right moving frame 71. The cylinder 43 of the right rear support part 5b is fixed to the right end of the left-right moving frame 71.

[0063] 5, the front left and right guide rails 72 are disposed on the front surface 71a of the left and right moving frame 71. The front left and right guide rails 72 are disposed along the left-right direction B. The front left and right guide rails 72 fit into the front guide fitting portions 65a of the rotating frame 61.

[0064] 6, the rear left and right guide rails 73 are disposed on the rear surface 71b of the left and right moving frame 71. The rear left and right guide rails 73 are disposed along the left-right direction B. The rear left and right guide rails 73 fit into the rear guide fitting portions 66a of the rotating frame 61.

[0065] In this way, the front left and right guide rails 72 fit into the front guide fitting portion 65a, and the rear left and right guide rails 73 fit into the rear guide fitting portion 66a, so that the left and right moving frame 71 can move along the left and right direction B relative to the rotating frame 61.

[0066] As shown in Fig. 5, the rack 74 is disposed on the front surface 71a of the left-right moving frame 71. The rack 74 is disposed along the left-right direction B. The rack 74 is disposed below the front left-right guide rails 72. The rack 74 is disposed below the rotating frame 61.

[0067] 10 is a cross-sectional view taken along the line FF' in FIG. 8, seen from the rear direction A2 toward the front. As shown in FIG. 10, the pinion 75 meshes with the rack 74. The pinion 75 is disposed below the rack 74.

[0068] The motor 76 shown in Fig. 5 rotates the pinion 75. As shown in Fig. 8, the motor 76 is disposed so that its output shaft extends along the front-rear direction A. The pinion 75 is fixed to the output shaft of the motor 76. The motor 76 is disposed in front of the pinion 75.

[0069] As shown in Figures 5 and 8, the motor support frame 77 supports the motor 76. The motor support frame 77 supports the motor 76 on the front wall portion 65 of the rotating frame 61. The motor support frame 77 is disposed in the center of the rotating frame 61 in the left-right direction B. The motor support frame 77 extends downward from the rotating frame 61. The motor support frame 77 supports the motor 76 on the underside of the rotating frame 61.

[0070] By rotating the motor 76, the pinion 75 rotates, and the left-right moving frame 71 moves in the left-right direction B together with the rack 74 meshing with the pinion 75. Because the front left-right guide rails 72 fit into the front guide fitting portions 65a and the rear left-right guide rails 73 fit into the rear guide fitting portions 66a, the left-right moving frame 71 moves in the left-right direction B while being guided by the front guide fitting portions 65a and the rear guide fitting portions 66a of the rotating frame 61.

[0071] (Belt conveyor 7) Fig. 11 is a perspective view showing the belt conveyor 7 near the position adjustment mechanism 6. In Fig. 11, the belt conveyor 7 is shown in solid lines, and the main beam 14, the side work table 8, the stand 3, and the work table 4 are shown in two-dot chain lines. The belt conveyor 7 has a front belt conveyor section 81 and a rear belt conveyor section 82.

[0072] The front belt conveyor section 81 is disposed on the main beam 14, and is disposed from the rear side of the cutter head 21 to approximately the rear end of the main beam 14. More specifically, the rear end 81a of the front belt conveyor section 81 protrudes rearward from the rear end of the main beam 14. The front end 82a of the rear belt conveyor section 82 is disposed below the rear end 81a of the front belt conveyor section 81. The rear belt conveyor section 82 is disposed on the platform 3, and extends rearward from the platform 3. Soil and sand carried rearward on the front belt conveyor section 81 falls downward from the rear end 81a, and is placed on the front end 82a of the rear belt conveyor section 82, and is carried rearward.

[0073] In the position adjustment mechanism 6 of the embodiment, the front-rear movement cylinder 52 is disposed on the front side of the front-rear movement frame 51, and the rack 74, pinion 75, and motor 76 are disposed on the front side of the left-right movement frame 71. In this way, the front-rear movement cylinder 52, rack 74, pinion 75, and motor 76 are disposed on the opposite side of the rear end 81 a of the front belt conveyor unit 81 across the front-rear movement frame 51 in the front-rear direction A. This makes it possible to prevent soil moving from the front belt conveyor unit 81 to the rear belt conveyor unit 82 from falling onto the drive mechanism, such as the front-rear movement cylinder 52, rack 74, pinion 75, and motor 76.

[0074] (Position adjustment of rear support 5) When excavating a tunnel, the underground excavation equipment 1 of this embodiment extends the gripper section 30 to fix the rear section 12 to the tunnel. Next, the thrust cylinder 13a is extended to press the cutter head 21 against the face (the surface to be excavated) and rotate it. This causes the disc cutter 221 to crush the rock at the face, thereby performing excavation.

[0075] Next, the left rear support section 5a and the right rear support section 5b are extended downward and placed on the tunnel, thereby supporting the main beam 14 in the tunnel, and then the gripper section 30 is retracted. Next, the thrust cylinder 13a is retracted, causing the rear section 12 to move toward the cutter head (front side).

[0076] Next, the gripper section 30 is extended to fix the rear section 12 to the tunnel, and then the left rear support section 5a and the right rear support section 5b of the rear support 5 are retracted upward and the thrust cylinder 13a is extended to perform excavation. By repeating these operations, the underground excavation device 1 moves forward while excavating.

[0077] Figure 12 is a diagram for explaining the position of the rear support 5 when excavating a straight tunnel. Figure 12 is a diagram of the rear support 5 and the position adjustment mechanism 6 viewed from the rear, with the main beam 14 indicated by a two-dot chain line. In Figure 12, the inner peripheral surface 100s of the tunnel 100 is indicated by a dotted line, and the central axis 100a of the tunnel 100 is also indicated.

[0078] If the line passing through the center of the cutter head 21 and along the main beam 14 in a plan view is defined as the central axis 2a of the main body 2, in the state shown in Figure 12, the pair of left rear support parts 5a and right rear support parts 5b are arranged symmetrically left and right with respect to the central axis 2a.

[0079] 12, when the tunnel 100 is on a straight line, the left-right position of the central axis 100a of the tunnel 100 coincides with the central axis 2a of the main body 2. Therefore, by arranging the pair of left and right rear support parts 5a and 5b symmetrically with respect to the central axis 2a, the pair of left and right rear support parts 5a and 5b are also arranged symmetrically with respect to the central axis 100a of the tunnel 100. This allows the rear support 5 to be appropriately positioned in accordance with the curved surface of the circular inner peripheral surface 100s of the tunnel 100, and the pair of left and right rear support parts 5a and 5b can appropriately support the main body 2 from below.

[0080] FIG. 13 is a plan view showing the state in which a curved tunnel is being excavated. In the curved tunnel 100 shown in FIG. 13, the central axis 100a of the tunnel and the central axis 2a of the main body 2 do not coincide in the left-right direction B, resulting in misalignment. Therefore, the position of the rear support 5 is adjusted relative to the main beam 14 to arrange the pair of left and right rear support parts 5a and 5b symmetrically with respect to the central axis 100a of the tunnel 100. In FIG. 13, the rotating frame 61 is rotated clockwise relative to the main beam 14 in a top view, and the left-right moving frame 71 is moved leftward in the direction B1 relative to the main beam 14. Furthermore, the forward-backward moving frame 51 has its forward-backward position adjusted so as to avoid other components of the underground excavation equipment 1 or the support structure 101.

[0081] This allows a pair of left rear support parts 5a and right rear support parts 5b to be arranged symmetrically about the central axis 100b even when the tunnel 100 is curved, and the rear support 5 can be appropriately positioned relative to the inner surface 100s of the circularly curved tunnel 100.

[0082] (Features, etc.) The underground excavation equipment 1 of this embodiment is provided with a position adjustment mechanism 6 that adjusts the position of the rear support 5 relative to the main body 2. As a result, when constructing a tunnel in a sharp curve, if the central axis 2a of the main body 2 deviates from the central axis 100a of the tunnel 100 in a plan view, the position of the rear support 5 can be adjusted to align with the central axis 100a of the tunnel 100, thereby improving the stability of support for the main body 2.

[0083] In the underground excavation equipment 1 of this embodiment, the position adjustment mechanism 6 has a front-to-rear movement mechanism 50 that moves the rear support 5 in the front-to-rear direction relative to the main body 2. This makes it possible to adjust the front-to-rear position so as to avoid interference with other components of the underground excavation equipment 1 or to avoid the support structure 101 when constructing a tunnel in a sharp curve.

[0084] In the underground excavation equipment 1 of this embodiment, the position adjustment mechanism 6 has a rotation mechanism 60 that rotates the rear support 5 relative to the main body 2. As a result, when constructing a tunnel in a sharp curve, if the central axis 2a of the main body 2 deviates from the central axis 100a of the tunnel 100 in a plan view, the position of the rear support 5 can be adjusted to align with the axis of the tunnel, thereby improving the stability of support for the main body 2.

[0085] In the underground excavation equipment 1 of this embodiment, the position adjustment mechanism 6 has a left-right movement mechanism 70 that moves the rear support 5 in the left-right direction B relative to the main body 2. This makes it possible to adjust the position of the rear support 5 so that it is aligned with the axis of the tunnel when the central axis of the main body 2 deviates from the axis of the tunnel when constructing a sharp curve in the tunnel, thereby improving the stability of support for the main body 2.

[0086] (Other Embodiments) Although one embodiment of the present disclosure has been described above, the present disclosure is not limited to the above embodiment, and various modifications are possible without departing from the gist of the invention.

[0087] (A) In the above embodiment, a pair of hydraulically operated front-rear movement cylinders 52 are used as an example of a front-rear movement actuator that moves the front-rear movement frame 51 in the front-rear direction A, but this is not limitative. For example, a pneumatically or electrically operated cylinder that expands and contracts may be used. Furthermore, the front-rear movement actuator is not limited to a cylinder, and may be a motor that rotates a pinion meshed with a rack, as in the left-right movement mechanism 70.

[0088] (B) In the above embodiment, the hydraulically operated rotation cylinder 63 is used as an example of a rotation actuator that rotates the rotation frame 61, but this is not limiting. For example, a cylinder that expands and contracts pneumatically or electrically may be used. Furthermore, the rotation actuator is not limited to a cylinder, and may be a motor that rotates a gear that is engaged with a gear formed around the rotation pin 62.

[0089] (C) In the above embodiment, the motor 76 that rotates the pinion 75 meshing with the rack 74 is used as an example of a left-right movement actuator that moves the left-right movement frame 71 in the left-right direction B. However, this is not limited to a motor, and a cylinder such as the front-rear movement mechanism 50 may also be used. This cylinder can be extended and retracted hydraulically, pneumatically, or electrically.

[0090] (D) In ​​the above embodiment, in order to reduce the effect of earth and sand carried by the belt conveyor 7, the front-rear movement cylinder 52 is disposed in front of the front-rear movement frame 51 and the motor 76 is disposed in front of the left-right movement frame 71, but they may also be disposed in the rear. In that case, in order to reduce the effect of falling earth and sand, it is preferable that the rear end 81 a of the front belt conveyor section 81 and the front end 82 a of the rear belt conveyor section 82 are disposed behind the front-rear movement cylinder 52 and the motor 76.

[0091] (E) In the above embodiment, the position adjustment mechanism 6 has the forward / backward movement mechanism 50, the rotation mechanism 60, and the left / right movement mechanism 70, but it may have only one of these mechanisms or only two of these mechanisms.

[0092] (F) In the above embodiment, the rear support 5 has a left rear support portion 5a and a right rear support portion 5b, and the shoe 41 of the left rear support portion 5a and the shoe 41 of the right rear support portion 5b are separated from each other, but the shoe 41 of the left rear support portion 5a and the shoe 41 of the right rear support portion 5b may be connected below the main beam 14. It is preferable that the portion connecting the shoes 41 be curved along the inner peripheral surface 100s of the tunnel 100.

[0093] (Appendix 1) An underground excavation device comprising: a main body having a front body including a cutter head provided with a plurality of cutters, and a rear body including a gripper unit for obtaining a reaction force when excavating and arranged rearward of the front body; a rear support arranged rearward of the rear body so as to be movable in the vertical direction and supporting the main body; and a position adjustment mechanism for adjusting the position of the rear support relative to the main body.

[0094] (Supplementary Note 2) The underground excavation equipment according to Supplementary Note 1, wherein the position adjustment mechanism has a forward / backward movement mechanism that moves the rear support in the forward / backward direction relative to the main body.

[0095] (Appendix 3) An underground excavation device according to Appendix 2, wherein the main body is connected to the forward body section, slidably supports the rear body section, and further has a main beam arranged along the fore-and-aft direction, and the fore-and-aft movement mechanism has a fore-and-aft movement frame movable along the main beam, and a fore-and-aft movement actuator that moves the fore-and-aft movement frame relative to the main beam.

[0096] (Supplementary Note 4) The underground excavation equipment according to Supplementary Note 3, wherein the forward / backward movement actuator is a forward / backward movement cylinder connected to the main beam and the forward / backward movement frame and arranged on the front side of the forward / backward movement frame.

[0097] (Supplementary Note 5) The underground excavation equipment according to any one of Supplementary Note 1 to Supplementary Note 4, wherein the position adjustment mechanism has a rotation mechanism that rotates the rear support relative to the main body around a rotation axis along the up-down direction.

[0098] (Appendix 6) An underground drilling rig as described in Appendix 5, wherein the main body is connected to the forward body section, slidably supports the rear body section, and further has a main beam arranged along the fore-and-aft direction, and the rotation mechanism has a rotating frame that rotates relative to the main beam, and a rotation actuator that rotates the rotating frame relative to the main beam.

[0099] (Appendix 7) An underground excavation device as described in Appendix 6, wherein the position adjustment mechanism further has a front-to-rear movement mechanism that moves the rear support in the front-to-rear direction relative to the main body, the front-to-rear movement mechanism having a front-to-rear movement frame that is arranged above the rotating frame and is movable along the main beam, and a front-to-rear movement actuator that moves the front-to-rear movement frame relative to the main beam, the rotation mechanism further has a rotation pin that is fixed to the rotating frame and rotatably supported on the front-to-rear movement frame, and the rotation actuator is a rotation cylinder connected to the front-to-rear movement frame and the rotation pin.

[0100] (Supplementary Note 8) The underground excavation equipment according to any one of Supplementary Note 1 to Supplementary Note 7, wherein the position adjustment mechanism has a left-right movement mechanism that moves the rear support left and right relative to the main body.

[0101] (Appendix 9) An underground excavation device as described in Appendix 8, wherein the main body is connected to the forward body portion, slidably supports the rear body portion, and further has a main beam arranged along the longitudinal direction, and the left-right movement mechanism has a left-right movement frame that can move in the left-right direction relative to the rear support, and a left-right movement actuator that moves the left-right movement frame relative to the rear support.

[0102] (Appendix 10) An underground excavator as described in Appendix 9, wherein the position adjustment mechanism has a rotation mechanism that rotates the rear support relative to the main body around a rotation axis along the up-down direction, the rotation mechanism has a rotating frame that rotates relative to the main beam and a rotation actuator that rotates the rotating frame relative to the main beam, the left-right movement actuator is a motor and is supported by the rotating frame, and the left-right movement mechanism further has a pinion connected to the output shaft of the motor and a rack that meshes with the pinion and is arranged along the left-right direction on the left-right movement frame.

[0103] The underground drilling equipment disclosed herein has the effect of being able to properly ground the rear support to the tunnel when constructing a tunnel with a sharp curve.

[0104] 1: Underground excavation equipment 2: Main body 5: Rear support 6: Position adjustment mechanism 11: Forward body section 12: Rear body section 21: Cutter head 30: Gripper section 211: Disk cutter

Claims

1. An underground excavation device comprising: a main body having a front body including a cutter head provided with a plurality of cutters, and a rear body including a gripper unit for obtaining a reaction force when excavating and disposed rearward of the front body; a rear support disposed rearward of the rear body for supporting the main body; and a position adjustment mechanism for adjusting the position of the rear support relative to the main body.

2. An underground excavation device as described in claim 1, wherein the position adjustment mechanism has a forward / backward movement mechanism that moves the rear support in the forward / backward direction relative to the main body.

3. An underground excavation device as described in claim 2, wherein the main body further has a main beam connected to the forward body portion, slidably supporting the rear body portion, and arranged along the fore-aft direction, and the fore-aft movement mechanism has a fore-aft movement frame movable along the main beam, and a fore-aft movement actuator that moves the fore-aft movement frame relative to the main beam.

4. An underground excavation device as set forth in claim 3, wherein the forward / rearward movement actuator is a forward / rearward movement cylinder connected to the main beam and the forward / rearward movement frame and disposed on the front side of the forward / rearward movement frame.

5. An underground excavation device as described in claim 1, wherein the position adjustment mechanism has a rotation mechanism that rotates the rear support relative to the main body around a rotation axis along the vertical direction.

6. An underground drilling device as described in claim 5, wherein the main body further has a main beam connected to the forward body section, slidably supporting the rear body section, and arranged along the fore-and-aft direction, and the rotation mechanism has a rotating frame that rotates relative to the main beam, and a rotation actuator that rotates the rotating frame relative to the main beam.

7. An underground excavation device as described in claim 6, wherein the position adjustment mechanism further has a fore-aft movement mechanism which moves the rear support in the fore-aft direction relative to the main body, the fore-aft movement mechanism having a fore-aft movement frame arranged above the rotating frame and movable along the main beam, and a fore-aft movement actuator which moves the fore-aft movement frame relative to the main beam, the rotation mechanism further has a rotation pin fixed to the rotating frame and rotatably supported by the fore-aft movement frame, and the rotation actuator is a rotation cylinder connected to the fore-aft movement frame and the rotation pin.

8. An underground excavation device as set forth in claim 1, wherein the position adjustment mechanism has a left-right movement mechanism for moving the rear support left-right relative to the main body.

9. An underground excavation device as described in claim 8, wherein the main body further has a main beam connected to the forward body portion, slidably supporting the rear body portion, and arranged along the fore-and-aft direction, and the left-right movement mechanism has a left-right movement frame movable in the left-right direction relative to the rear support, and a left-right movement actuator that moves the left-right movement frame relative to the rear support.

10. An underground excavation device as described in claim 9, wherein the position adjustment mechanism has a rotation mechanism that rotates the rear support relative to the main body around a rotation axis along the up-down direction, the rotation mechanism has a rotating frame that rotates relative to the main beam, and a rotation actuator that rotates the rotating frame relative to the main beam, the left-right movement actuator is a motor and is supported by the rotating frame, and the left-right movement mechanism further has a pinion connected to the output shaft of the motor, and a rack that meshes with the pinion and is arranged on the left-right movement frame along the left-right direction.

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