JP2011241578A - Boring machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability of a boring machine and a direction correcting device used to bury a propulsion pipe underground.SOLUTION: A boring machine comprises a forefront body equipped with a cutter head, a main body, and a direction correcting device supporting the forefront body. The direction correcting device has a jack cylinder provided near a front end of the main body of the boring machine and a joint provided near a rear end of the forefront body of the boring machine. The jack cylinder can be rotatably driven at least in a vertical direction by inserting a shaft into a through-hole provided in a support base installed on the inside surface of the main body and a through-hole of the jack cylinder. A front end part of the jack cylinder is provided with a cylinder rod having a sphere-shaped or substantially sphere-shaped portion near the front end thereof. The inner surface of the joint is formed in a spherical or almost spherical surface of a size equal or substantially equal to a spherical or almost spherical body of the cylinder rod, and the inner surface of the joint fits with the spherical or almost spherical body of the cylinder rod to swingably support the forefront body of the boring machine.

Description

  The present invention relates to an excavator. In particular, the present invention relates to an excavator used to embed a propulsion pipe in the ground.

  The propulsion method is known as one of the methods for burying the propulsion pipe in the ground. The propulsion method is a method in which an excavating machine is introduced from a starting shaft and excavated in an arbitrary direction such as a horizontal direction or an up-and-down direction using the excavating machine to embed the propulsion pipe in the ground.

  The excavator is provided with a cutter head having a plurality of bits for excavating the ground in the head body, and the cutter head is driven by a motor and a speed reducer in the excavator to excavate the ground. Yes. An example of a conventional excavator is shown in Patent Documents 1 to 5.

JP 2009-46804 A JP 2000-291385 A JP 2000-45686 A JP 2005-213749 A JP 2000-274181 A

  When the excavation hole core being excavated by the excavator is displaced, the excavation direction is adjusted by adjusting the direction of the head body provided with the cutter head. This is done by tilting the head of the excavator at an arbitrary angle with respect to the main body. Specifically, a plurality of (preferably three) direction correcting devices (jack cylinders) are provided inside the main body of the excavator, and the head body is inclined at an arbitrary angle by the direction correcting device. However, this direction correcting device can be attached only to a small size because of the space in the excavator, and there is a problem that the support pins of the direction correcting device are often damaged.

  In addition, an expansion pipe joint (bellows) is used between the head body and the main body, and the bellows prevent the intrusion of mud and muddy water from the joint between the head body and the main body and support the head body. . However, the expansion pipe joint that supports the top body also breaks the expansion pipe joint because the expansion pipe joint enters the top body and the main body due to pressure from mud or muddy water. Sometimes.

  In view of the above problems, the present inventors have invented an excavation machine equipped with a highly durable direction correcting device. In addition, the expansion tube joint that supports the head body together with the direction correction device does not protect the seam between the head body and the main body, but by using a different protection mechanism that exhibits an equivalent technical effect, The durability of the protective mechanism of the seam between the head and the top body was increased.

  A first invention is an excavator for excavating the ground, in which a head body provided with a cutter head and a main body are separable, and the excavator is located between the head body and the main body. The direction correction device has a jack cylinder provided near the front end of the main body of the excavator and a joint provided near the rear end of the head body of the excavator. The jack cylinder can be driven to rotate at least in the vertical direction by inserting a shaft through a through hole provided in a support base installed on an inner surface of the main body and a through hole of the jack cylinder. A front end portion of the jack cylinder includes a cylinder rod having a spherical shape or a substantially spherical shape near the tip, and the inner surface of the joint has a spherical shape or a substantially spherical shape of the cylinder rod. It is formed into a spherical surface or a substantially spherical surface having the same or substantially the same size, and when the inner surface of the joint and the spherical body or the substantially spherical body of the cylinder rod are fitted together, It is an excavator that supports the swinging freely.

  In a conventional excavator direction correcting device, the tip of the cylinder rod and the joint are fixed by a support pin. Therefore, the force is received in a plane. However, in the excavator equipped with the direction correcting device configured as in the present invention, the cylinder rod and the joint are supported by a spherical surface or a substantially spherical surface. Therefore, it is possible to configure a direction correcting device having higher durability than the conventional one.

  In the above invention, the jack cylinder further has the cylinder rod inserted into a hole formed in the front surface of the front end portion, and the cylinder rod is driven back and forth in the hole to expose the cylinder rod. You may comprise like an excavation machine which expands / contracts the length of a part.

  By driving the cylinder rod in the front-rear direction, the degree of freedom of movement of the leading body can be increased.

  In the above-described invention, the excavator further includes a free ring having a groove portion in the outer peripheral direction in the vicinity of a joint between the head body and the main body on the outer surface of the main body, and the groove portion of the free ring Further, it may be configured like an excavating machine provided with an O-ring having the same or almost the same size as the inner diameter of the head body.

  By configuring as in the present invention, since the expansion joint is not used as in the prior art, troubles such as breakage or biting of the expansion joint can be prevented. Further, by providing not only the O-ring but also a free ring, the movement between the top body and the main body can be further increased.

  The above-mentioned free ring is preferably provided as follows. That is, it is preferable that the free ring is an excavator that is provided with a loose fit in a groove provided on the outer surface of the main body of the excavator.

  Since the free ring is provided on the outer surface of the main body with a loose fit rather than a tight fit, a gap is provided between the bottom surface of the groove on the outer surface of the main body and the free ring. Therefore, the free ring can move in the vertical direction along the side surface of the groove portion on the outer side surface of the main body. Therefore, it is possible to absorb the movement of the leading body more than simply providing an O-ring.

  The direction correcting device in the above-described invention can be configured as follows. That is, a direction correcting device used in an excavator capable of separating a leading body and a main body, wherein the direction correcting device is installed between the leading body and the main body in order to support the leading body, A jack cylinder provided near the front end of the main body of the excavator and a joint provided near the rear end of the head body of the excavator, the jack cylinder being supported on the inner surface of the main body By inserting a shaft through a through-hole provided in a base and a through-hole of the jack cylinder, the shaft can be driven to rotate at least in the vertical direction. The joint has a spherical surface or a substantially spherical surface having the same or substantially the same size as the sphere or the substantially spherical body of the cylinder rod. A direction used in an excavator that is shaped and supports the head body of the excavator in a freely swingable manner by the direction correcting device by fitting the inner surface of the joint with a spherical body or a substantially spherical body of the cylinder rod. It can be configured like a correction device.

  By using the excavator of the present invention, a more durable direction correcting device can be configured, although the space used is the same as before. In addition, the durability of the protective mechanism of the joint between the main body and the top body can be enhanced as compared with the conventional expansion joint.

It is an external appearance perspective view of a digging machine. It is a longitudinal cross-sectional view in the use condition of an excavation machine. It is a figure which shows a direction correction apparatus typically. It is sectional drawing in the AA of a direction correction apparatus. It is a figure which shows typically the state by which the head body was inclined by the direction correction apparatus. It is a figure which shows a free ring and an O-ring typically. It is a figure which shows the conventional direction correction apparatus typically. It is an enlarged view of the part which provided the free ring and the O-ring. It is a figure which shows the outline | summary of underground excavation using an excavation machine.

  An excavator 1 according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of the appearance of an excavator 1 according to the present invention. Further, the excavator 1 is connected to the joint member 5 at the rear end thereof. This is schematically shown in FIG. The joint member 5 is placed in the propulsion pipe 7. When the excavator 1 performs excavation, the propulsion pipe 7 is embedded therein.

  There are various types of propulsion pipes 7 such as concrete pipes, resin pipes, fume pipes, steel sheath pipes, synthetic pipes, and the like, but not limited to these, and various pipes are used according to their purposes. be able to.

  The digging machine 1 has at least a main body 2 and a head body 3. The main body 2 is preferably configured such that a front portion storing a direction correcting device 4 (described later) and a motor for supporting the head body 3 and a rear portion which is a backup pipe are detachably connected. Is not limited to this. The front part and the rear part (backup pipe) of the main body 2 are provided with a mud pipe 61, a mud pipe 62, etc. therein. Further, the back-up pipe has a rear flange for joining to the joint member 5 at the rear end.

  At the front end of the top body 3, a cutter head 31 having a plurality of bits 32 for excavating the ground is provided. The cutter head 31 is rotationally driven by a motor and a speed reducer, and excavates the ground with a plurality of bits 32 in the cutter head 31. Further, when the hydraulic unit 14 supplies power to the propulsion jack 8 through the hydraulic hose, the propulsion jack 8 presses the excavator 1 or the propulsion pipe 7 from the rear side, and the propulsion pipe 7 is sequentially added to the ground while sequentially propelling the propulsion pipe 7. Will be buried. In addition, it is preferable that the water stop process is performed so that muddy water etc. may not flow into the start shaft 10 in the start shaft 10 when the excavator 1 and the propulsion pipe 7 are buried in the ground.

  Further, the cutter head 31 can be exchanged according to the type of ground to be excavated, and the cutter head 31 having an arbitrary structure can be used.

  The excavator 1 is connected to the joint member 5 at the rear end portion thereof. When a plurality of the propulsion pipes 7 are buried, the joint member placed on the rear end portion of the joint member 5 placed on the propulsion pipe 7 on the traveling direction side and the propulsion pipe 7 newly buried. 5 are connected to each other by being connected to each other.

  The joint member 5 is a collecting pipe placed in the propulsion pipe 7, and the mud feeding pipe 63 and the drain mud pipe 64 of the joint member 5 are the mud feeding pipe 61 and the mud pipe 62 in the excavator 1, and the start. The mud pipe 65 and the mud pipe 66 in the shaft 10 or the mud pipe 63 and the mud pipe 64 of the other joint member 5 are connected.

  The excavator 1 passes mud water inside the excavator 1 through the mud pipe 65 of the start shaft 10, the bypass valve 13 of the start shaft 10, the mud pipe 63 of the joint member 5, and the mud pipe 61 of the excavator 1. Into. And the excavator 1 mixes the excavated soil excavated by the cutter bit 32 into the mud. The muddy water mixed with the excavated soil is sent to the mud pipe 66 of the start shaft 10 through the mud pipe 62 of the excavator 1 and the mud pipe 64 of the joint member 5. Then, the muddy water mixed with the excavated soil is sent to the muddy water treatment machine 12 from the mud pipe 66 of the start shaft 10 through the bypass valve 13 provided in the start shaft 10 by the mud pump 16. The muddy water treatment machine 12 separates the excavated soil and muddy water. After this separation process, the mud pump 15 again sends mud water through the mud pipe 65 of the start shaft 10, the bypass valve 13 of the start shaft 10, and the mud pipe 63 of the joint member 5. It is sent to the pipe 61 and excavated soil is mixed in the muddy water. By repeating this, the excavated soil is discharged. FIG. 9 shows an outline of underground excavation using the excavator 1.

  The bypass valve 13 is a valve for bypassing the mud pipe 65 and the mud pipe 66. Such a bypass valve 13 is preferably provided also in the mud pipe 61 and the mud pipe 62 in the excavator 1.

  The vicinity of the center of the main body 2 of the excavator 1 is hollow. In the vicinity of the center behind the motor, a light receiving unit (laser target 21) that receives the laser light emitted from the laser transit 81 placed on a base installed on the base surface of the start shaft 10 is provided. By receiving the laser light emitted from the laser transit 81 with the laser target 21, the traveling direction of the excavator 1 can be confirmed. The light receiving state may be captured by an imaging device called a target camera, and the traveling direction of the excavator 1 may be confirmed from the image.

  Information or an image received by the laser target 21 with the laser beam is sent to the operation panel 11 via a communication line or the like, and the person in charge can confirm the traveling direction on the operation panel 11 to control the traveling direction. For example, when a control instruction for tilting the head body 3 is input on the operation panel 11 (for example, information such as an angle at which the head body 3 is tilted and a distance moved by the angle), the control instruction is transmitted via the communication line. By being transmitted from 11 to the main body, the direction correcting device 4 performs control to tilt the head body 3 based on the control instruction.

  The top body 3 includes a motor and a speed reducer for rotating the cutter head 31. The leading body 3 is supported by the direction correcting device 4, the free ring 50 and the O-ring 51.

  The main body 2 and the top body 3 of the excavator 1 can be separated. The leading body 3 of the excavator 1 is supported by a direction correction device 4, a free ring 50 and an O-ring 51 provided inside the main body 2 so as to be swingable. A plurality of the direction correcting devices 4 are preferably arranged along the circumferential direction of the inner surface of the main body 2, and the head body 3 is preferably supported by the three direction correcting devices 4 at equal intervals. This is schematically shown in FIG. By driving the direction correcting device 4, the motor, the speed reducer, and the cutter head 31 of the head body 3 can be directed to arbitrary angles, and the excavation direction can be corrected. FIG. 3 shows an enlarged view of the direction correcting device 4.

  3A is a longitudinal sectional view of the direction correcting device 4, FIG. 3B is a rear view of the direction correcting device 4 seen from the rear, and FIG. 3C is a view of the direction correcting device 4 seen from the front. It is a front view. FIG. 3D is a diagram showing the locking state of the direction correcting device 4 in an easily understandable manner.

  The direction correcting device 4 includes a jack cylinder 41 and a joint 44. The jack cylinder 41 is installed on the main body 2, and the joint 44 is installed on the top body 3.

  The head body 3 of the excavator 1 is supported by receiving the cylinder rod 43 in the direction correcting device 4 provided in the main body 2 by the bearing 441 of the joint 44 of the head body 3.

  The direction correcting device 4 is installed near the inner surface near the front end of the main body 2 and near the rear end of the head body 3, preferably at equal intervals (for example, at an interval of 120 degrees) on the circumference of the inner surface of the main body 2. A plurality (for example, three) are installed.

  The support base 42 of the direction correcting device 4 is installed on the inner surface near the tip of the main body 2 by bolts, welding, or the like. By inserting the shaft 411 through the through hole provided in the support base 42 and the through hole of the jack cylinder 41, the jack cylinder 41 can be driven to rotate at least in the vertical direction around the shaft 411. The jack cylinder 41 is preferably cylindrical, but may have other shapes.

  A cylinder rod 43 is provided at the front end of the jack cylinder 41. Therefore, by driving the jack cylinder 41 in the vertical direction, the cylinder rod 43 at the front end portion of the jack cylinder 41 can be directed in the vertical direction. In some cases, the jack cylinder 41 may be driven not only in the vertical direction but also in the horizontal direction or in any direction. In this case, the shaft 411 may be inserted from an arbitrary direction such as the vertical side instead of the horizontal side as shown in FIG. Further, instead of passing the shaft 411 through the through hole in one direction, an arbitrary shape (for example, a spherical shape) of the shaft 411 can be used. The tip 431 of the cylinder rod 43 is formed into a sphere or a substantially spherical shape (hereinafter simply referred to as “sphere” in the present specification, but also includes a substantially spherical body).

  A hole for inserting the cylinder rod 43 is provided in the front end portion (surface perpendicular to the longitudinal section) of the jack cylinder 41, and the cylinder rod 43 is inserted into the hole. Accordingly, the cylinder rod 43 can be driven back and forth with respect to the axial direction (the traveling direction of the excavator 1) by a hydraulic jack or the like provided in the jack cylinder 41. That is, by driving the cylinder rod 43 back and forth in the axial direction with respect to the jack cylinder 41, the length of the cylinder rod 43 exposed can be adjusted. As a result, the length of the exposed portion of the cylinder rod 43 is expanded and contracted.

  The support base 42 may be installed at a position where the sphere of the tip portion 431 of the cylinder rod 43 slightly protrudes from the vicinity of the tip portion of the main body 2 in a normal state (a state where the head body 3 is not inclined). preferable.

  The joint 44 is installed in a direction to receive the spherical body of the tip end portion 431 of the cylinder rod 43 installed in the main body 2, and is screwed by a bolt 45 near the rear end portion of the top body 3. The joint 44 may be fixed to the top body 3 by a method other than the bolt 45.

  The inner surface of the joint 44 is a concave surface 441 (spherical surface or substantially spherical surface, hereinafter the same), and is a sliding bearing 441 of a size that can fit the spherical body of the tip portion 431 of the cylinder rod 43. That is, the radius of the sphere of the tip 431 of the cylinder rod 43 and the radius of the concave surface 441 on the inner side (bearing) of the joint 44 are the same (or substantially the same). The joint 44 is divided into two or a predetermined number in the vertical direction or the horizontal direction, or in the front-rear direction with respect to the traveling direction of the excavator 1. The contacting surface is a hemispherical surface. Then, the spherical body of the tip 431 of the cylinder rod 43 is sandwiched and fixed by the upper / lower, left / right or front / rear joints 44. As a result, the spherical body of the tip 431 of the cylinder rod 43 can be received by the concave surface 441 on the inner surface of the joint 44. Then, when the jack cylinder 41 directs the cylinder rod 43 in an arbitrary direction, the bearing is smoothly received.

  FIG. 5 is a diagram schematically showing the case where the head body 3 is tilted by the direction correcting device 4. The head body 3 is preferably tilted by three direction correcting devices 4. In this case, each direction correcting device 4 is a cylinder based on a control instruction for tilting the head body 3 from the operation panel 11 or the like. The leading body 3 is tilted by extending or contracting the rod 43 or moving the jack cylinder 41 up and down. In this case, the tip end portion 431 of the cylinder rod 43 is a spherical body and the inner side of the joint 44 that receives the spherical portion 441 is a concave surface 441, so that the bearing can be smoothly performed regardless of the angle.

  In addition, from the viewpoint of durability, the direction correcting device 4 is preferably made of steel, but is not limited thereto, and may be any material.

  A conventional direction correcting device 9 is shown in FIG. FIG. 7 (a) is a diagram schematically showing a longitudinal section when the conventional direction correcting device 9 is provided in the excavator, and FIG. 7 (b) is easy to understand the locking state of the conventional direction correcting device 9. FIG.

  As shown in FIG. 7, in the conventional direction correcting device 9, a cylinder rod 92 is provided at the front end portion of a jack cylinder 91 that is swingably attached to a support base. A through hole through which the support pin 94 is inserted is provided at the distal end portion 93 of the cylinder rod 92. A joint 95 is attached to the rear end portion of the top body 3, and a through hole having the same size as the through hole of the tip end portion 93 of the cylinder rod 92 is provided. And the jack cylinder 91 (cylinder rod 92) and the joint 95 are joined by aligning the through-hole of the front-end | tip part 93 of the cylinder rod 92 in the position suitable for the through-hole of the joint 95, and inserting the support pin 94 there. is doing. Therefore, the top body 3 can be inclined with the support pin 94 as a fulcrum.

  Since the distal end portion 93 of the cylinder rod 92 is fixed to the joint 95 by the support pin 94, the load is applied in a plane. Therefore, when the head body 3 is tilted, a load other than the vertical direction is generated on the support pin 94. Further, as described above, in particular, when returning the excavator 1 to the starting shaft 10 from which the excavator 1 has started (when the excavator 1 is moved backward), the outer peripheral resistance and catching of the excavator 1 and the propulsion pipe 7 occur. Therefore, the support pin 94 may be damaged when a large load is applied to the support pin 94.

  However, in the direction correcting device 4 of the present invention, both the distal end portion 431 of the cylinder rod 43 and the concave surface 441 of the joint 44 are spherical surfaces, and thus are resistant to loads other than the vertical direction when the head body 3 is tilted. It becomes a structure. Further, since the spherical body of the tip 431 of the cylinder rod 43 and the concave surface 441 of the joint 44 are formed larger than the cylinder rod 43, the load is applied on a surface larger than the support pin 94 in the conventional direction correcting device 9. be able to. Therefore, it can withstand a larger load than the conventional direction correcting device 9.

  Further, at the joint between the main body 2 and the front body 3, the diameter of the outer surface near the front end of the main body 2 is slightly smaller than the diameter of the inner surface near the rear end of the front body 3. This is because the head body 3 is supported by the direction correcting device 4 so that the head body 3 can swing freely, so that the direction of the head body 3 can be adjusted. Located inside the rear edge). Therefore, mud, muddy water, etc. infiltrate from the joint between the top body 3 and the main body 2 as it is. Conventionally, this is prevented by using an expansion joint 96 between the main body 2 and the top body 3.

  Therefore, in the excavator 1 of the present invention, the same technical effect is achieved by the free ring 50 and the O-ring 51 instead of the expansion pipe joint 96. FIG. 6 schematically shows the free ring 50 and the O-ring 51.

  A free ring 50 having a concave cross section is disposed in the circumferential direction in the vicinity of the joint between the leading body 3 and the main body 2 on the outer surface of the main body 2. At this time, the O-ring 51 is attached so as to circumscribe the groove of the free ring 50. The O-ring 51 is sized to project from the groove of the free ring 50. That is, the diameter of the cross section of the O-ring 51 is larger than the depth of the groove portion of the free ring 50. Moreover, although it is preferable to set it as the magnitude | size which fits closely in a groove part (size in which O-ring 51 fits closely to the groove part of the free ring 50), loose fitting may be sufficient.

  The free ring 50 is provided around the outer surface of the main body 2 in the vicinity of the joint between the leading body 3 and the main body 2, and a groove portion 52 is formed on the outer surface of the free ring 50. It is preferable to be provided. In this case, the free ring 50 may be tightly fitted in the groove portion 52 on the outer side surface (the free ring 50 is closely fitted to the groove portion 52), or between the bottom surface of the groove portion 52 and the free ring 50. A loose fit with a gap (a slight (or slight) gap is present between the groove 52 and the free ring 50), and the free ring 50 moves vertically along the side surface of the groove 52 on the outer surface of the main body 2. It is possible to be fitted). By this gap, the free ring 50 can move in the vertical direction along the side surface of the groove 52. Since the free ring 50 can slightly move in the vertical direction in the groove portion 52 on the outer side surface of the main body 2, even if the movement of the top body 3 increases, it can be absorbed. In the case of loose fitting, it is preferable to provide a sealing 53 on the vicinity of the periphery of the groove 52 (for example, the side surface of the groove 52 from the rear end of the main body 2 (the position shown in FIG. 8). This is for preventing muddy water or the like from entering through the groove 52.

  The depth d of the groove 52 on the outer surface of the main body 2 is the height h when the O-ring 51 is fitted to the free ring 50 (the sum of the thickness of the bottom surface of the free ring 50 and the cross-sectional diameter of the O-ring 51). ) Or shallower than that. This is schematically shown in FIG. FIG. 8 is an enlarged view of the vicinity of the outer surface of the main body 2 at two positions where the free ring 50 is provided. The free ring 50 and the O-ring 51 located in the upper part of FIG. 8 and the free ring 50 and the O-ring 51 located in the lower part of FIG. 8 are in a positional relationship of 180 degrees with respect to the center of the cross section of the main body 2. It is a place. Therefore, the upper part of FIG. 8 and the lower part of FIG. 8 are enlarged views of the vicinity of the outer surface of the main body 2 at two points where the diameter and the circumference contact each other when the cross section of the main body 2 is a circumference.

When the diameter (inner diameter) of the free ring 50 is R, the diameter of the outer surface of the main body 2 (the outer surface at the position where the free ring 50 is attached) is R1, and the depth of the groove 52 around the free ring 50 is d. The maximum value R _max of the diameter R of the free ring 50 is when the groove portion 52 is not provided in the main body 2 (d = 0) (that is, when the free ring 50 is attached without providing the groove portion 52), and R _max = R1 Become. Further, the minimum value R _min of the diameter R of the free ring 50 is a case where the free ring 50 is closely fitted in the groove portion 52, and R _min = R1-2d. That is, the diameter R of the free ring 50 is R1-2d ≦ R ≦ R1.

  2 and 3 show the excavator 1 provided with an O-ring 51 and a free ring 50. In the enlarged view of FIG. 8, the case where the groove part 52 and the free ring 50 of the outer surface of the main body 2 are loosely fitted is shown.

  The size (diameter) of the state where the O-ring 51 is circumscribed in the groove portion of the free ring 50 fixed to the outer surface of the joint of the main body 2 with the head body 3 is the size (diameter) of the inner surface of the head body 3. ) Or slightly larger. Thereby, the O-ring 51 and the inner surface of the head body 3 can be brought into close contact with each other, and intrusion of mud and muddy water from the joint between the head body 3 and the main body 2 can be prevented. Further, since the free ring 50 and the O-ring 51 can absorb the elongation and inclination of the head body 3, even if the head body 3 is tilted by the direction correcting device 4, it can be absorbed.

  In general, when a joint is configured, it may be configured only by an O-ring. However, since the movement of the head body 3 of the excavator 1 is large, the movement of the head body 3 of the excavator 1 cannot be absorbed only by the O-ring. For this reason, the width of the movement of the top body 3 must be reduced. Therefore, the free ring 50 circumscribing the O-ring 51 is provided in the groove 52 on the outer side surface of the main body 2 by loose fitting so that the movement of the head body 3 can be absorbed more greatly.

  By using the excavator 1 of the present invention, the direction correcting device 4 having higher durability can be configured, although the space used is the same as the conventional one. Further, the durability of the protective mechanism of the joint between the main body 2 and the head body 3 can be enhanced as compared with the conventional expansion joint.

1: Excavator 2: Main body 3: Leading body 4: Direction correction device 5: Joint member 6: Feeding / discharging mud pipe 7: Propulsion pipe 8: Propulsion jack 9: Conventional direction correction apparatus 10: Starting shaft 11: Operation panel 12: Muddy water treatment machine 13: Bypass valve 14: Hydraulic unit 15: Mud pump 16: Mud pump 17: Starting shaft 21: Laser target 31: Cutter head 32: Bit 41: Jack cylinder 411: Shaft 42: Support Base 43: Cylinder rod 431: Cylinder rod tip 44: Joint 441: Bearing 45: Bolt 50: Free ring 51: O-ring 52: Groove 53 on the outer surface of the main body 53: Sealing of the groove 61: Mud pipe in the excavator 62: Mud pipe 63 in the excavator 63: Mud pipe 64 in the joint member 64: Mud pipe 65 in the joint member 65: Mud pipe 66 in the start shaft 66: Start shaft Waste pipe 81: Laser transit 91: Jack cylinder 92 of a conventional direction correcting device: Cylinder rod 93 of a conventional direction correcting device 93: Tip end 94 of a cylinder rod of a conventional direction correcting device: Support of a conventional direction correcting device Pin 95: Conventional direction correcting device joint 96: Expansion pipe joint

Claims (5)

An excavator for excavating the ground, in which the main body and the main body with a cutter head are separable,
The excavator is
A direction correcting device for supporting the head body between the head body and the main body;
The direction correcting device includes:
A jack cylinder provided near the front end of the main body of the excavator, and a joint provided near the rear end of the head body of the excavator,
The jack cylinder is
By inserting a shaft through a through-hole provided in a support base installed on the inner surface of the main body and a through-hole of the jack cylinder, it can be driven to rotate at least in the vertical direction.
A front end portion of the jack cylinder is provided with a cylinder rod formed in a spherical shape or a substantially spherical shape near the tip,
The joint is
The inner surface is formed into a spherical surface or a substantially spherical surface having the same or almost the same size as the spherical or substantially spherical body of the cylinder rod,
By fitting the inner surface of the joint and the spherical body of the cylinder rod or a substantially spherical body, the head body of the excavator is supported by the direction correcting device so as to freely swing.
An excavator characterized by that. The jack cylinder further comprises:
The cylinder rod is inserted into a hole formed in the front end front surface,
By driving the cylinder rod back and forth in the hole, the length of the exposed portion of the cylinder rod is expanded and contracted.
The excavation machine according to claim 1, wherein: The excavator further includes:
A free ring having a groove is provided in the outer circumferential direction in the vicinity of the joint between the head body and the main body on the outer surface of the main body,
An O-ring having the same or almost the same size as the inner diameter of the head body is provided to circumscribe the groove portion of the free ring.
The excavation machine according to claim 1 or 2, characterized in that. The freering is
It is circumferentially provided with a loose fit in a groove provided on the outer surface of the main body of the excavator,
The excavation machine according to claim 3, wherein A direction correcting device for use in an excavator in which the front body and the main body are separable,
The direction correcting device includes:
In order to support the head body, installed between the head body and the body,
A jack cylinder provided near the front end of the main body of the excavator, and a joint provided near the rear end of the head body of the excavator,
The jack cylinder is
By inserting a shaft through a through-hole provided in a support base installed on the inner surface of the main body and a through-hole of the jack cylinder, it can be driven to rotate at least in the vertical direction.
A front end portion of the jack cylinder is provided with a cylinder rod formed in a spherical shape or a substantially spherical shape near the tip,
The joint is
The inner surface is formed into a spherical surface or a substantially spherical surface having the same or almost the same size as the spherical or substantially spherical body of the cylinder rod,
By fitting the inner surface of the joint and the spherical body of the cylinder rod or the substantially spherical body, the head body of the excavator is supported by the direction correcting device so as to freely swing.
A direction correction device used in an excavator characterized by the above.

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