Deep foundation excavator

Abstract

To prevent an ascending / descending rope from falling off an ascending / descending sheave and / or an opening / closing rope from falling off an opening / closing sheave.SOLUTION: A work device 5 of a deep foundation excavator 1 comprises: a first ascending / descending sheave 19 and a first opening / closing sheave 21 movably provided in a longitudinal direction of an arm 10; a second ascending / descending sheave 23 and a second opening / closing sheave 30 provided on the arm 10 at a distance from the first ascending / descending sheave 19 and the first opening / closing sheave 21; an ascending / descending rope 38 wound around the first ascending / descending sheave 19 and the second ascending / descending sheave 23 and raising / lowering a clamshell bucket 9; and an opening / closing rope 40 wound around the first opening / closing sheave 21 and the second opening / closing sheave 30 and opening / closing the clamshell bucket 9. The arm 10 is provided with a rope support device 49 which is movable in a longitudinal direction thereof, and the rope support device 49 supports the opening / closing rope 40 to prevent the opening / closing rope 40 from falling off.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a deep foundation excavator suitable for use in shaft excavation work and the like. [Background technology]

[0002] A deep foundation excavator is known as a working machine suitable for use in excavating a vertical shaft. The working device of the deep foundation excavator includes an arm rotatably mounted on the vehicle body, a clamshell bucket mounted on the arm so as to be able to rise and fall, and a bucket lifting and opening / closing device that controls the lifting and opening / closing operation of the clamshell bucket. The bucket lifting and opening / closing device includes a movable sheave that can move in the length direction of the arm, a fixed sheave fixed to the arm, a lifting rope and an opening / closing rope wound around the movable sheave and the fixed sheave, a lifting cylinder that lifts and lowers the clamshell bucket, and an opening / closing cylinder that opens and closes the clamshell bucket.

[0003] The lifting cylinder changes the distance between the movable sheave and the fixed sheave to unwind and reel in the lifting rope, thereby lifting and lowering the clamshell bucket. The opening and closing cylinder changes the distance between the movable sheave and the fixed sheave to unwind and reel in the opening and closing rope, thereby opening and closing the clamshell bucket. The deep foundation excavator lowers the clamshell bucket into the shaft with the tip of the arm positioned above the shaft, and excavates earth and sand by opening and closing the clamshell bucket (Patent Document 1).

[0004] When using a deep foundation excavator to excavate a shaft, the clamshell bucket must be lowered into the ground by its own weight. For this reason, the deep foundation excavator reduces the gap between the movable sheave and the fixed sheave by the lifting cylinder after the clamshell bucket lands on the ground, thereby providing an appropriate amount of slack to the lifting rope and the opening and closing rope. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2021-161716 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, when the excavation depth is small and the distance between the movable sheave and the fixed sheave is large, the lifting rope or the opening / closing rope becomes loosened downward between the movable sheave and the fixed sheave, and falls off the movable sheave or the fixed sheave. In addition, the lifting rope or the opening / closing rope that becomes loosened swings greatly due to the impact of starting the movement when the clamshell bucket is raised and lowered or opened and closed, and wears out due to rubbing against the movable sheave or the fixed sheave, resulting in a shortened lifespan. Furthermore, since the opening / closing rope is wound around the movable sheave and the fixed sheave in multiple layers, the weight of the opening / closing rope on the arm side wound around the movable sheave and the fixed sheave (the weight of the opening / closing rope acting on the movable sheave and the fixed sheave) is much greater than the weight of the opening / closing rope on the clamshell bucket side hanging down from the arm. For this reason, even if the clamshell bucket is lowered in an open state, the opening / closing rope cannot be paid out in accordance with the descent speed of the clamshell bucket, and the clamshell bucket closes, resulting in a problem of reduced excavation performance.

[0007] An object of the present invention is to provide a deep foundation excavator that can prevent the lifting rope from falling off the lifting sheave and / or the opening / closing rope from falling off the opening / closing sheave. [Means for solving the problem]

[0008] The present invention comprises a self-propelled vehicle body, and a working device provided on the vehicle body, the working device having a clamshell bucket, the working device including an arm provided rotatably with respect to the vehicle body, a first lifting sheave and a first opening / closing sheave provided on the arm so as to be movable in the length direction thereof, a second lifting sheave and a second opening / closing sheave provided on the arm, respectively, spaced apart from the first lifting sheave and the first opening / closing sheave, and a moving mechanism for moving the clamshell bucket around the first lifting sheave and the second lifting sheave. This deep foundation excavator is equipped with a lifting rope for raising and lowering the bucket, and an opening and closing rope wound around the first opening and closing sheave and the second opening and closing sheave for opening and closing the clamshell bucket, and is characterized in that a rope support device for supporting at least one of the lifting rope and the opening and closing rope is provided movably in the longitudinal direction of the arm between the first lifting sheave and the second lifting sheave on the arm, and at least one between the first opening and closing sheave and the second opening and closing sheave. Effect of the Invention

[0009] According to the present invention, by supporting at least one of the lifting rope and the opening / closing rope with a rope support device, it is possible to prevent at least one of the lifting rope and the opening / closing rope from becoming significantly slack. As a result, it is possible to prevent the lifting rope from falling off the first lifting sheave or the second lifting sheave and / or the opening / closing rope from falling off the first opening / closing sheave or the second opening / closing sheave. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a left side view showing a deep foundation excavator according to a first embodiment of the present invention. [Diagram 2] FIG. 11 is a left side view showing the arm, bucket lifting / opening device, etc., in a state where the sheave mounting member is furthest from the base arm. [Diagram 3] FIG. 4 is a plan view showing the arm, bucket lifting / opening device, etc. [Figure 4]FIG. 11 is a left side view showing the arm, bucket lifting / opening device, etc. with the sheave mounting member moved to the base arm side. [Diagram 5] FIG. 11 is a left side view showing the arm, bucket lifting / opening device, etc., in a state where the sheave mounting member is closest to the base arm. [Figure 6] FIG. [Figure 7] 3 is an enlarged left side view showing the sheave mounting member, the rope support device, etc. in FIG. 2. [Figure 8] 3 is an enlarged left side view showing the rear end of the base arm, the rope support device, etc. in FIG. 2. [Figure 9] 6 is an enlarged left side view showing the rear end of the base arm, a plurality of rope support devices, a sheave mounting member, etc. in FIG. 5. [Figure 10] FIG. [Figure 11] 1 is a cross-sectional view of an upper guide arm, a lower guide arm, a lifting cylinder, a rope support device, etc., as viewed from the direction of arrows XI-XI in FIG. [Figure 12] 12 is a right side view of the rope support device as viewed from the direction of arrows XII-XII in FIG. 11. [Figure 13] 13 is a cross-sectional view of the base arm, the upper guide arm, the lower guide arm, the fixed rope support, etc., as viewed from the direction of the arrows XIII-XIII in FIG. 3. [Figure 14] This is a right side view showing the state in which the opening and closing rope that has become slack during the excavation work of the shaft is supported by the rope support device. [Figure 15] FIG. 11 is a left side view of the arm showing a connecting member, a rope support device, etc. according to the second embodiment. [Figure 16] FIG. 11 is a left side view of the arm, showing a connecting member, a rope support device, etc. according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, a deep foundation excavator according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. Figures 1 to 14 show a first embodiment of the present invention. In the embodiment, the running direction of the deep foundation excavator is defined as the front-rear direction, and the direction perpendicular to the running direction is defined as the left-right direction.

[0012] The deep foundation excavator 1 is manufactured based on, for example, a crawler-type hydraulic excavator. The deep foundation excavator 1 is composed of a self-propelled crawler-type lower traveling body 2, an upper rotating body 3 rotatably mounted on the lower traveling body 2, and a working device 5 (described later) provided on the upper rotating body 3. The lower traveling body 2 and the upper rotating body 3 constitute the vehicle body of the deep foundation excavator 1.

[0013] The cab 4 is provided on the left front side of the upper rotating body 3. The cab 4 defines a driver's compartment, and an operator who operates the deep foundation excavator 1 sits in the cab 4. A driver's seat 4A where the operator sits is provided inside the cab 4, and around the driver's seat 4A, operating devices (not shown) for operating the traveling operation of the lower traveling body 2, the rotating operation of the upper rotating body 3, and the working device 5 are provided.

[0014] The working device 5 includes a boom 6 provided on the upper rotating body 3 so as to be rotatable in the vertical direction, an arm 10 described below, a clamshell bucket 9, a bucket lifting / opening / closing device 17, and a plurality of rope support devices 49. A boom cylinder 7 is provided between the upper rotating body 3 and the boom 6, and the boom 6 rotates relative to the upper rotating body 3 in response to the extension and retraction of the boom cylinder 7. An arm cylinder 8 is provided between the boom 6 and the arm 10, and the arm 10 rotates relative to the boom 6 or upper rotating body 3 in response to the extension and retraction of the arm cylinder 8.

[0015] The clamshell bucket 9 is disposed on the front end (one end) side of the arm 10, and is suspended so as to be liftable and lowerable by a lifting rope 38 described later. The clamshell bucket 9 has a bucket support part 9A, a pair of buckets 9B provided on the lower side of the bucket support part 9A so as to be able to open and close, a connecting bracket 9C to which the pair of buckets 9B are rotatably connected, and a pair of opening and closing arms 9D connecting between the bucket support part 9A and the pair of buckets 9B. The bucket support part 9A is provided with a plurality of upper sheaves 9E, and the connecting bracket 9C is provided with a plurality of lower sheaves 9F that face the upper sheaves 9E in the up-down direction.

[0016] The other end 38B of the lifting rope 38 is attached to the bucket support portion 9A of the clamshell bucket 9. An opening / closing rope 40, which will be described later, is wound alternately around the upper sheave 9E and the lower sheave 9F of the clamshell bucket 9, and the other end 40B of the opening / closing rope 40 is attached to the bucket support portion 9A of the clamshell bucket 9.

[0017] The arm 10 is rotatably provided at the tip of the boom 6. As shown in Fig. 5, the arm 10 is configured to be separable from a base arm 11 formed of a hollow cylinder and extending in the front-rear direction, an upper guide arm 12 and a lower guide arm 13 detachably provided at the rear side of the base arm 11, and a sheave mounting member 14 movably attached to the upper guide arm 12 and the lower guide arm 13.

[0018] Base arm 11 is the base of arm 10, and is formed as a square cylinder having a rectangular cross-sectional shape extending in the up-down direction. Base arm 11 is surrounded by left side plate 11A and right side plate 11B that face each other in a direction (left-right direction) perpendicular to the longitudinal direction (front-rear direction) of arm 10, an upper plate 11C that connects the upper ends of left side plate 11A and right side plate 11B, and a lower plate 11D that connects the lower ends of left side plate 11A and right side plate 11B.

[0019] The distance between the left side plate 11A and the right side plate 11B is set smaller than the distance between the upper plate 11C and the lower plate 11D. The front end (one end in the length direction) 11E of the base arm 11 is closed, and the rear end (the other end in the length direction) 11F of the base arm 11 is an open end. A step surface 11G is formed in a portion of the upper plate 11C of the base arm 11 that is located forward of the center in the front-rear direction and has a lower height (distance from the lower plate 11D) than a portion located rearward of the center. An intermediate guide sheave 37, which will be described later, is provided on the step surface 11G. A boom mounting bracket 11H and a cylinder mounting bracket 11J are provided on the lower plate 11D of the base arm 11. The boom mounting bracket 11H is rotatably connected to the tip of the boom 6 via a boom connecting pin 11K (see FIG. 1). The cylinder mounting bracket 11J is pin-connected to the tip of the arm cylinder 8, the base end of which is attached to the boom 6. Therefore, the base arm 11 rotates in the front-rear direction or the up-down direction about the boom connecting pin 11K in response to the extension and retraction movement of the arm cylinder 8.

[0020] Two pin insertion holes 11L, 11M that are vertically spaced apart and penetrate in the left-right direction are formed on the rear end sides of the left side plate 11A and the right side plate 11B. An upper arm connecting pin 12B, which will be described later, is inserted into the upper pin insertion hole 11L, and a lower arm connecting pin 13B, which will be described later, is inserted into the lower pin insertion hole 11M. In addition, trunnion pin insertion holes 11N that penetrate in the left-right direction are formed on the left side plate 11A and the right side plate 11B in front of the pin insertion holes 11L, 11M (see FIG. 8). A cylinder support pin 18D, which will be described later, is inserted into these two trunnion pin insertion holes 11N.

[0021] The upper guide arm 12 and the lower guide arm 13 are detachably attached to the rear side of the base arm 11 in a pair in the up-down direction. The upper guide arm 12 and the lower guide arm 13 are each formed as a rectangular cylinder having a rectangular cross-sectional shape, and extend in the length direction (front-rear direction) of the base arm 11. A cylindrical portion 12A extending in the left-right direction is fixed to the front end of the upper guide arm 12, and a cylindrical portion 13A extending in the left-right direction is fixed to the front end of the lower guide arm 13. An upper arm connecting pin 12B is inserted into the inner periphery of the cylindrical portion 12A of the upper guide arm 12, and both ends of the upper arm connecting pin 12B are inserted into the upper pin insertion hole 11L of the base arm 11. A lower arm connecting pin 13B is inserted into the inner periphery of the cylindrical portion 13A of the lower guide arm 13, and both ends of the lower arm connecting pin 13B are inserted into the lower pin insertion hole 11M of the base arm 11. Meanwhile, the rear ends of the upper guide arm 12 and the lower guide arm 13 are connected via a connecting member 13C, so that the upper guide arm 12 and the lower guide arm 13 extend rearward from the rear end 11F of the base arm 11 while maintaining a constant distance between them in the vertical direction.

[0022] The sheave mounting member 14 is attached to the upper guide arm 12 and the lower guide arm 13 so as to be movable in the length direction. With a first lifting sheave 19 and a first opening / closing sheave 21 (described later) attached to the sheave mounting member 14, the sheave mounting member 14 moves in the front-rear direction along the upper guide arm 12 and the lower guide arm 13. The sheave mounting member 14 is formed as a cylinder having a rectangular cross-sectional shape similar to that of the base arm 11, and surrounds the upper guide arm 12 and the lower guide arm 13 from the outside. The sheave mounting member 14 is formed as a short cylinder (frame) surrounded by a left side plate 14A, a right side plate 14B, an upper plate 14C, and a lower plate 14D.

[0023] A pin insertion hole 14E penetrating in the left-right direction is formed in the front portion of each of the left side plate 14A and the right side plate 14B constituting the sheave mounting member 14. A rod mounting pin 18F described later is inserted into these two pin insertion holes 14E. A first lifting sheave shaft 20 described later is attached to the center of the left side plate 14A constituting the sheave mounting member 14. A first opening / closing sheave shaft 22 described later is attached to the center of the right side plate 14B constituting the sheave mounting member 14.

[0024] A slide plate 15 is provided between the inner peripheral surfaces of the left side plate 14A, the right side plate 14B and the upper plate 14C of the sheave mounting member 14 and the upper guide arm 12, respectively, and the slide plate 15 is in slidable contact with the upper guide arm 12. A slide plate 16 is provided between the inner peripheral surfaces of the left side plate 14A, the right side plate 14B and the lower plate 14D of the sheave mounting member 14 and the lower guide arm 13, respectively, and the slide plate 16 is in slidable contact with the lower guide arm 13. These slide plates 15, 16 are fixed to the sheave mounting member 14 using bolts or the like, and allow the sheave mounting member 14 to move (slide) smoothly relative to the upper guide arm 12 and the lower guide arm 13.

[0025] The bucket lifting / opening device 17 is provided on the arm 10. The bucket lifting / opening device 17 controls various operations including the lifting / opening and opening / closing operations of the clamshell bucket 9. The bucket lifting / opening device 17 includes a lifting cylinder 18, a first lifting sheave 19, a first opening / closing sheave 21, a second lifting / opening sheave 23, a second opening / closing sheave 30, an opening / closing cylinder 31, an intermediate guide sheave 37, a lifting rope 38, an opening / closing rope 40, a slack adjustment sheave 47, and a slack adjustment cylinder 48, which will be described later.

[0026] The lift cylinder 18 is provided inside the base arm 11 and extends along the length direction (front-rear direction) of the base arm 11. The lift cylinder 18 lifts and lowers the clamshell bucket 9 by extending or retracting in response to the operation of an operating device provided inside the cab 4. The lift cylinder 18 has a tube 18A, a piston (not shown) inserted into the tube 18A, and a rod 18B whose base end is attached to the piston and whose tip protrudes from the tube 18A.

[0027] A mounting flange 18C is fixed to the tube 18A of the lift cylinder 18, and two pin holes (not shown) are formed in the mounting flange 18C on either side of the tube 18A. Two cylinder support pins 18D inserted into the trunnion pin insertion holes 11N of the base arm 11 (left side plate 11A and right side plate 11B) fit into these two pin holes. Thus, the tube 18A of the lift cylinder 18 is connected to the base arm 11 via the cylinder support pins 18D.

[0028] Meanwhile, a mounting eye 18E is provided at the tip of the rod 18B of the lifting cylinder 18. A rod mounting pin 18F is inserted through the mounting eye 18E and the pin insertion hole 14E of the sheave mounting member 14. As a result, the rod 18B of the lifting cylinder 18 is connected to the sheave mounting member 14 via the rod mounting pin 18F.

[0029] In this manner, the tube 18A of the lift cylinder 18 is attached to the base arm 11 via the cylinder support pin 18D, and the rod 18B is attached to the sheave mounting member 14 via the rod mounting pin 18F. Therefore, by extending and retracting the lift cylinder 18, the sheave mounting member 14 moves in the front-rear direction along the upper guide arm 12 and the lower guide arm 13.

[0030] The first lifting sheave 19 is attached to the outer surface of the left side plate 14A constituting the sheave mounting member 14 via a first lifting sheave shaft 20. The first lifting sheave shaft 20 is fixed to the center of the left side plate 14A constituting the sheave mounting member 14 and protrudes leftward from the left side plate 14A. A plurality of first lifting sheaves 19 (e.g., five) are provided lined up in the axial direction of the first lifting sheave shaft 20 and are supported by the sheave mounting member 14 so as to be rotatable about the first lifting sheave shaft 20.

[0031] The first opening and closing sheave 21 is attached to the outer surface of the right side plate 14B constituting the sheave mounting member 14 via a first opening and closing sheave shaft 22. The first opening and closing sheave shaft 22 is fixed to the center of the right side plate 14B constituting the sheave mounting member 14 and protrudes to the right from the right side plate 14B. A plurality of first opening and closing sheaves 21 (e.g., five) are provided axially aligned on the first opening and closing sheave shaft 22 and are supported rotatably about the first opening and closing sheave shaft 22 relative to the sheave mounting member 14.

[0032] The second lifting sheave 23 is provided on the base arm 11 at a distance from the first lifting sheave 19. The second lifting sheave 23 is attached to the outer surface of the left side plate 11A constituting the base arm 11 via the second lifting sheave shaft 24. The second lifting sheave shaft 24 is fixed to the middle part in the longitudinal direction of the base arm 11 (left side plate 11A) and protrudes leftward from the left side plate 11A. The second lifting sheaves 23 are provided in a plurality (for example, four) arranged in the axial direction of the second lifting sheave shaft 24, and are supported on the base arm 11 so as to be rotatable about the second lifting sheave shaft 24. Therefore, the sheave mounting member 14 moves in response to the extension and contraction of the lifting cylinder 18, and the first lifting sheave 19 attached to the sheave mounting member 14 approaches or moves away from the second lifting sheave 23. A lifting rope 38 is wound around the first lifting sheave 19 and the second lifting sheave 23.

[0033] The opening / closing sheave moving mechanism 25 is provided on the right side plate 11B at a position in the middle in the front-rear direction of the base arm 11. The opening / closing sheave moving mechanism 25 supports the second opening / closing sheave 30 so that it can move in the front-rear direction. As shown in Fig. 3, the opening / closing sheave moving mechanism 25 includes a guide rail 26, a slide member 27, a frame member 28, and a second opening / closing sheave shaft 29.

[0034] The guide rail 26 is fixed to the right side plate 11B of the base arm 11. The slide member 27 is engaged with the guide rail 26 so as to be slidable in the length direction. The frame member 28 is attached to the slide member 27 using bolts or the like. A rod 31B of an opening / closing cylinder 31, which will be described later, is attached to the frame member 28. In addition, a second opening / closing sheave shaft 29 is fixed to the frame member 28, and the second opening / closing sheave shaft 29 protrudes from the frame member 28 to the right.

[0035] The second opening / closing sheave 30 is rotatably attached to the second opening / closing sheave shaft 29 of the opening / closing sheave moving mechanism 25. That is, the second opening / closing sheave 30 is provided on the outer surface of the right side plate 11B constituting the base arm 11 so as to be movable in the front-rear direction via the opening / closing sheave moving mechanism 25. A plurality of second opening / closing sheaves 30 (for example, four) are provided lined up in the axial direction of the second opening / closing sheave shaft 29 constituting the opening / closing sheave moving mechanism 25, and are supported rotatably around the second opening / closing sheave shaft 29 relative to the base arm 11.

[0036] The opening / closing cylinder 31 is provided on the right side plate 11B at the rear end 11F side of the base arm 11. The opening / closing cylinder 31 extends in the front-rear direction and moves the second opening / closing sheave 30 closer to and farther from the first opening / closing sheave 21. The opening / closing cylinder 31 has a tube 31A, a piston (not shown) inserted into the tube 31A, and a rod 31B whose base end is attached to the piston and whose tip protrudes from the tube 31A. The bottom side of the tube 31A is attached to the rear end 11F side of the right side plate 11B of the base arm 11 via a bracket 31C. The tip of the rod 31B is attached to the frame member 28 of the opening / closing sheave moving mechanism 25. Therefore, the second opening / closing sheave 30 attached to the opening / closing sheave moving mechanism 25 moves in the front-rear direction in response to the extension and contraction of the opening / closing cylinder 31, and moves closer to and farther from the first opening / closing sheave 21.

[0037] The guide sheave support shaft 32 is provided on the front end 11E side of the base arm 11. One end of the guide sheave support shaft 32 is fixed to the front end 11E side of the left side plate 11A, and the other end of the guide sheave support shaft 32 protrudes leftward from the left side plate 11A. The guide sheave support shaft 32 rotatably supports the lift guide sheave 33 and the opening / closing guide sheave 34.

[0038] The lift guide sheave 33 and the opening / closing guide sheave 34 are provided on the left side plate 11A of the base arm 11 via the guide sheave support shaft 32. The lift guide sheave 33 and the opening / closing guide sheave 34 have the same diameter. The lift guide sheave 33 guides the lift rope 38 wound around the first lift sheave 19 and the second lift sheave 23 to the clamshell bucket 9. The opening / closing guide sheave 34 guides the opening / closing rope 40 wound around the first opening / closing sheave 21, the second opening / closing sheave 30, and the intermediate guide sheave 37 and the slack adjustment sheave 47 described later to the clamshell bucket 9. As a result, as shown in FIG. 1, for example, while the arm 10 is held horizontally to the ground, the clamshell bucket 9 can be raised and lowered in the vertical direction using the lift rope 38 wound around the lift guide sheave 33 arranged at the front end of the arm 10.

[0039] The lifting / lowering guide sheave 33 and the opening / closing guide sheave 34 are disposed on the front end 11E side of the left side panel 11A, which is highly visible to the operator sitting in the driver's seat 4A, of the base arm 11. This allows the operator to operate the bucket lifting / opening device 17 while visually checking the state of the lifting / lowering ropes 38 and the opening / closing ropes 40 attached to the clamshell bucket 9.

[0040] The intermediate guide sheave shaft 35 is provided on a stepped surface 11G located on the front end 11E side of the base arm 11. A frame member 36 bent into a U-shaped cross section is fixed to the stepped surface 11G of the base arm 11. One end of the intermediate guide sheave shaft 35 is attached to the stepped surface 11G and the other end is attached to the frame member 36, so that the intermediate guide sheave shaft 35 extends upward from the stepped surface 11G while inclining slightly rearward.

[0041] The intermediate guide sheave 37 is rotatably provided on the step surface 11G of the base arm 11 via an intermediate guide sheave shaft 35. The intermediate guide sheave 37 is interposed between the opening / closing guide sheave 34 provided on the left side plate 11A of the base arm 11 and the slack adjustment sheave 47 provided on the right side plate 11B of the base arm 11, and the opening / closing rope 40 extending from the slack adjustment sheave 47 is wound around the intermediate guide sheave 37 to guide the opening / closing rope 40 to the opening / closing guide sheave 34. In this way, even if the slack adjustment sheave 47 and the opening / closing guide sheave 34 are arranged on opposite sides of the base arm 11, the opening / closing rope 40 can be smoothly guided from the slack adjustment sheave 47 to the opening / closing guide sheave 34 via the intermediate guide sheave 37.

[0042] The lifting rope 38 is provided between the arm 10 and the clamshell bucket 9, and supports the clamshell bucket 9 so that it can be raised and lowered. The lifting rope 38 is made of a wire rope, and one end 38A of the lifting rope 38 is attached to a lifting rope mounting bracket 39 that protrudes from the left side plate 11A of the base arm 11. The other end 38B of the lifting rope 38 is attached to the bucket support part 9A of the clamshell bucket 9, and supports the clamshell bucket 9 (see FIG. 1). The middle part of the lifting rope 38 is wound alternately around a plurality of first lifting sheaves 19 and a plurality of second lifting sheaves 23.

[0043] The opening / closing rope 40 is provided between the arm 10 and the clamshell bucket 9, and opens and closes a pair of buckets 9B of the clamshell bucket 9. The opening / closing rope 40 is made of a wire rope, and one end 40A of the opening / closing rope 40 is attached to an opening / closing rope mounting bracket 41 protruding from the right side plate 11B of the base arm 11. The other end 40B of the opening / closing rope 40 is attached to the bucket support part 9A of the clamshell bucket 9 (see FIG. 1). The middle part of the opening / closing rope 40 is alternately wound around the multiple first opening / closing sheaves 21 and the multiple second opening / closing sheaves 30. The other end 40B side of the opening / closing rope 40 is alternately wound around the multiple upper sheaves 9E and the multiple lower sheaves 9F that constitute the clamshell bucket 9.

[0044] The clamshell bucket 9 descends when the lift cylinder 18 contracts and the first lift sheave 19 approaches the second lift sheave 23, and ascends when the lift cylinder 18 extends and the first lift sheave 19 moves away from the second lift sheave 23. On the other hand, the clamshell bucket 9 opens when the opening / closing cylinder 31 contracts and the second opening / closing sheave 30 approaches the first opening / closing sheave 21, and closes when the opening / closing cylinder 31 extends and the second opening / closing sheave 30 moves away from the first opening / closing sheave 21.

[0045] The slack adjustment sheave moving mechanism 42 is provided on the right side plate 11B, located on the front end 11E side of the base arm 11. The slack adjustment sheave moving mechanism 42 supports the slack adjustment sheave 47 so that it can move in the front-rear direction. As shown in Fig. 3, the slack adjustment sheave moving mechanism 42 includes a guide rail 43, a slide member 44, a frame member 45, and a slack adjustment sheave shaft 46.

[0046] The guide rail 43 is fixed to the right side plate 11B of the base arm 11. The slide member 44 is engaged with the guide rail 43 so as to be slidable in the length direction. The frame member 45 is attached to the slide member 44 using bolts or the like. A rod 48B of a slack adjustment cylinder 48, which will be described later, is attached to the frame member 45. In addition, a slack adjustment sheave shaft 46 is fixed to the frame member 45, and the slack adjustment sheave shaft 46 protrudes from the frame member 45 to the right.

[0047] The slack adjustment sheave 47 is rotatably attached to the slack adjustment sheave shaft 46 of the slack adjustment sheave moving mechanism 42. That is, the slack adjustment sheave 47 is provided on the right side plate 11B of the base arm 11 so as to be movable in the front-rear direction via the slack adjustment sheave moving mechanism 42. The slack adjustment sheave 47 is composed of a single sheave, and is supported by the base arm 11 so as to be rotatable about the slack adjustment sheave shaft 46.

[0048] The opening / closing rope 40 wound around the multiple first opening / closing sheaves 21 and the multiple second opening / closing sheaves 30 is sequentially wound around the slack adjusting sheave 47, the intermediate guide sheave 37, and the opening / closing guide sheave 34. Then, the other end 40B of the opening / closing rope 40 wound around the opening / closing guide sheave 34 is wound around the upper sheave 9E and the lower sheave 9F of the clamshell bucket 9, and then the other end 40B of the opening / closing rope 40 is attached to the bucket support part 9A.

[0049] The slack adjustment cylinder 48 is provided on the right side plate 11B of the base arm 11, located in front of the opening / closing sheave moving mechanism 25. The slack adjustment cylinder 48 extends in the front-rear direction, and moves the slack adjustment sheave 47 closer to or farther away from the second opening / closing sheave 30. The slack adjustment cylinder 48 has a tube 48A, a piston (not shown) inserted into the tube 48A, and a rod 48B whose base end is attached to the piston and whose tip protrudes from the tube 48A. The bottom side of the tube 48A is attached to the right side plate 11B of the base arm 11 via a bracket 48C. The tip of the rod 48B is attached to the frame member 45 of the slack adjustment sheave moving mechanism 42.

[0050] Therefore, the slack adjustment sheave 47 attached to the slack adjustment sheave moving mechanism 42 moves in the front-rear direction in response to the extension and retraction of the slack adjustment cylinder 48, and approaches and moves away from the second opening / closing sheave 30. As a result, for example, during excavation work of a vertical shaft using the deep foundation excavator 1, when the clamshell bucket 9 lands on the ground and the opening / closing rope 40 is in a slack state, the slack adjustment cylinder 48 is extended to move the slack adjustment sheave 47 away from the second opening / closing sheave 30, thereby removing the slack in the opening / closing rope 40.

[0051] Next, the plurality of rope support devices 49 used in this embodiment will be described with reference to FIGS.

[0052] A plurality of rope support devices 49 (for example, four) are provided between the first opening / closing sheave 21 and the second opening / closing sheave 30. These rope support devices 49 move in the length direction of the upper guide arm 12 and the lower guide arm 13 that configure the arm 10, while supporting from below the opening / closing rope 40 that is wound around the first opening / closing sheave 21 and the second opening / closing sheave 30. As shown in Figs. 10 and 11, the rope support device 49 is configured to include a base member 50, a roller support frame 55, an upper shaft member 58, a lower shaft member 59, and rollers 60, 61.

[0053] The base member 50 is formed in a rectangular frame shape (annular shape) so as to surround the side portion of the arm 10 (in this embodiment, the side portions of the upper guide arm 12 and the lower guide arm 13). The base member 50 has a structure that is removable from the side portion of the arm 10 (in this embodiment, it is separable in the circumferential direction of the arm 10). More specifically, the base member 50 has a rectangular frame shape surrounding the side of the arm 10 so as to be divisible into four in the circumferential direction of the arm 10, and is made up of U-shaped left and right plates 50A and 50B facing each other in a direction perpendicular to the longitudinal direction of the arm 10 (left-right direction), an upper plate 50D attached to the upper ends of the left and right plates 50A and 50B using bolts 50C, and a lower plate 50E attached to the lower ends of the left and right plates 50A and 50B using bolts 50C. The thickness of the right plate 50B is set to be greater than the thickness of the left plate 50A, and a roller support frame 55 is attached to the right plate 50B.

[0054] Two M-shaped upper brackets 50F are provided on the inner surface of the upper plate 50D constituting the base member 50, spaced apart from each other in the left-right direction, and protrude downward. Two M-shaped lower brackets 50G are provided on the inner surface of the lower plate 50E constituting the base member 50, spaced apart from each other in the left-right direction, and protrude upward. Two upper bearings 50H as guide members are rotatably attached to the protruding end of the upper bracket 50F, and two lower bearings 50J as guide members are rotatably attached to the protruding end of the lower bracket 50G. As shown in FIG. 11, when the base member 50 is attached to the upper guide arm 12 and the lower guide arm 13, the upper bearing 50H abuts against the upper surface of the upper guide arm 12, and the lower bearing 50J abuts against the lower surface of the lower guide arm 13. Therefore, the upper bearing 50H rolls in contact with the upper guide arm 12, and the lower bearing 50J rolls in contact with the lower guide arm 13, thereby allowing the base member 50 to move smoothly in the longitudinal direction of the upper guide arm 12 and the lower guide arm 13.

[0055] Two (four in total) slide plates 51 are provided on the inner surfaces of the left and right plates 50A and 50B constituting the base member 50, spaced apart in the vertical direction. The slide plates 51 as guide members are formed in a rectangular plate shape using a material with a low friction coefficient and excellent wear resistance, such as engineering plastic, and are fitted into frame-shaped holders 52 fixed to the inner surfaces of the left and right plates 50A and 50B. The upper slide plate 51 slides against the left and right sides of the upper guide arm 12, and the lower slide plate 51 slides against the left and right sides of the lower guide arm 13. These slide plates 51 reduce friction of the base member 50 against the upper guide arm 12 and the lower guide arm 13 when the base member 50 moves in the length direction of the upper guide arm 12 and the lower guide arm 13.

[0056] A flat upper mounting plate 53 protrudes upward from the upper end of the right side plate 50B constituting the base member 50. Two shaft insertion holes 53A, 53B penetrating in the left-right direction are formed in the upper mounting plate 53 and spaced apart in the up-down direction. A flat lower mounting plate 54 protrudes downward from the lower end of the right side plate 50B. Two shaft insertion holes 54A, 54B penetrating in the left-right direction are formed in the lower mounting plate 54 and spaced apart in the up-down direction. The upper mounting plate 53 and the lower mounting plate 54 constitute a part of the base member 50.

[0057] The roller support frame 55 is attached to the right side plate 50B of the base member 50. The roller support frame 55 has a cylindrical horizontal pipe 56 extending in the left-right direction and a vertical plate 57 extending in the up-down direction and having a U-shaped cross section. A flange portion 56A is provided at one end (left end) of the horizontal pipe 56, and the vertical plate 57 is fixed to the other end of the horizontal pipe 56. The roller support frame 55 is fixed integrally to the base member 50 by screwing a plurality of bolts 56B inserted into the flange portion 56A of the horizontal pipe 56 into the right side plate 50B of the base member 50. The vertical plate 57 of the roller support frame 55 extends in the up-down direction while facing the right side plate 50B, the upper mounting plate 53, and the lower mounting plate 54 of the base member 50. In addition, a terminal rope guide 56C extending upward while facing the vertical plate 57 is fixed to the horizontal pipe 56.

[0058] Two shaft insertion holes 57A, 57B corresponding to the shaft insertion holes 53A, 53B of the upper mounting plate 53 are formed on the upper end side of a vertical plate 57 constituting the roller support frame 55, and two cylinders 57C, 57D surrounding these shaft insertion holes 57A, 57B are fixed. Two shaft insertion holes 57E, 57F corresponding to the shaft insertion holes 54A, 54B of the lower mounting plate 54 are formed on the lower end side of the vertical plate 57, and two cylinders 57G, 57H surrounding these shaft insertion holes 57E, 57F are fixed by means of welding or the like.

[0059] The upper shaft member 58 and the lower shaft member 59 as shaft members are attached between the base member 50 and the roller support frame 55, spaced apart from each other in the vertical direction. One end of the upper shaft member 58 is inserted into the shaft insertion hole 53B of the upper mounting plate 53, and the other end is inserted into the shaft insertion hole 57B of the vertical plate 57 and the cylindrical body 57D. A through hole is formed in the other end of the upper shaft member 58 and the cylindrical body 57D, which penetrates in the radial direction, and a retaining bolt 58A is inserted into this through hole. One end of the lower shaft member 59 is inserted into the shaft insertion hole 54B of the lower mounting plate 54, and the other end is inserted into the shaft insertion hole 57F of the vertical plate 57 and the cylindrical body 57H. A through hole is formed in the other end of the lower shaft member 59 and the cylindrical body 57H, which penetrates in the radial direction, and a retaining bolt 59A is inserted into this through hole.

[0060] A plurality (e.g., five) of rollers 60 are rotatably attached to the lower shaft member 59, and a plurality (e.g., three) of rollers 60 and one roller 61 are rotatably attached to the upper shaft member 58. These rollers 60 and roller 61 constitute a rope receiver used in the present embodiment, and support the opening / closing rope 40 wound around the first opening / closing sheave 21 and the second opening / closing sheave 30 from below. The roller 60 is formed in a cylindrical shape that is inserted through the lower shaft member 59 and the upper shaft member 58 with a gap, and large-diameter disk-shaped flange portions 60A are fixed to both axial ends. The roller 61 is formed in a cylindrical shape that is inserted through the upper shaft member 58 with a gap, and a large-diameter disk-shaped flange portion 61A is fixed to one axial end (the upper mounting plate 53 side). In this way, the rollers 60 and roller 61 can support the opening / closing rope 40 from below while rotating with respect to the lower shaft member 59 and the upper shaft member 58, so that wear of the opening / closing rope 40 can be suppressed.

[0061] Here, the total axial length dimension A of the five rollers 60 attached to the lower shaft member 59 is set to be smaller than the distance B between the lower mounting plate 54 and the vertical plate 57 (A < B). Therefore, the five rollers 60 are attached to the lower shaft member 59 so as to be rotatable and axially movable. Similarly, the total axial length dimension C of the three rollers 60 and one roller 61 attached to the upper shaft member 58 is set to be smaller than the distance B between the upper mounting plate 53 and the vertical plate 57 (C < B). Therefore, the three rollers 60 and one roller 61 are attached to the upper shaft member 58 so as to be rotatable and axially movable. Thereby, even when the opening / closing rope 40 wound obliquely between the first opening / closing sheave 21 and the second opening / closing sheave 30 is displaced in a direction (left-right direction) orthogonal to the length direction in response to the movement of the first opening / closing sheave 21, the rollers 60 and roller 61 can support the opening / closing rope 40 while moving in the left-right direction following the displacement of the opening / closing rope 40.

[0062] Moreover, one end 40A of the opening / closing rope 40 is attached to the opening / closing rope mounting bracket 41 protruding from the right side plate 11B of the base arm 11, so that it swings up and down in response to the movement of the first opening / closing sheave 21. In contrast, one end 40A of the opening / closing rope 40 is not supported by the roller 61 attached to the upper shaft member 58, but is disposed in the space surrounded by the horizontal pipe 56, the terminal rope guide 56C, the vertical plate 57, and the upper shaft member 58. This makes it possible to prevent one end 40A of the opening / closing rope 40 from interfering with the adjacent parts of the opening / closing rope 40 or the roller 61.

[0063] One end of the upper external stop shaft 62 is inserted into the shaft insertion hole 53A of the upper mounting plate 53, and the other end is inserted into the shaft insertion hole 57A of the vertical plate 57 and the cylindrical body 57C. A through hole is formed radially through the other end of the upper external stop shaft 62 and the cylindrical body 57C, and a retaining bolt 62A is inserted into this through hole. A minute gap smaller than the diameter of the opening / closing rope 40 is formed between the flanges 60A, 61A of the rollers 60, 61 attached to the upper shaft member 58 and the upper external stop shaft 62, and the upper external stop shaft 62 externally stops the opening / closing rope 40 against the rollers 60 and 61.

[0064] One end of the lower external stop shaft 63 is inserted into the shaft insertion hole 54A of the lower mounting plate 54, and the other end is inserted into the shaft insertion hole 57E of the vertical plate 57 and the cylindrical body 57G. A through hole is formed radially through the other end of the lower external stop shaft 63 and the cylindrical body 57G, and a retaining bolt 63A is inserted into this through hole. A minute gap smaller than the diameter of the opening / closing rope 40 is formed between the flange portion 60A of the roller 60 attached to the lower shaft member 59 and the lower external stop shaft 63, and the lower external stop shaft 63 externally stops the opening / closing rope 40 against the roller 60.

[0065] On the right side plate 11B of the base arm 11, a pair of rope supports 64 in the vertical direction are arranged at two locations in the longitudinal direction of the base arm 11. As shown in Fig. 3 and Fig. 13, a total of four rope supports 64 are arranged between the rope support device 49 among the multiple rope support devices 49 that is closest to the second opening / closing sheave 30 and the second opening / closing sheave 30, specifically, between the rear end 11F of the base arm 11 and the second opening / closing sheave 30. The rope support 64 is formed, for example, of a rod bent into a U-shape, and is fixed to the right side plate 11B of the base arm 11 using a fastener (not shown) such as a bolt, so that it protrudes to the right from the base arm 11.

[0066] Two rope supports 64 arranged on the upper plate 11C side of the base arm 11 support the opening / closing rope 40 arranged between the upper edge of the first opening / closing sheave 21 and the upper edge of the second opening / closing sheave 30. Two rope supports 64 arranged on the lower plate 11D side of the base arm 11 support the opening / closing rope 40 arranged between the lower edge of the first opening / closing sheave 21 and the lower edge of the second opening / closing sheave 30. By providing the rope supports 64 between the rope support device 49 closest to the second opening / closing sheave 30 in this way, the opening / closing rope 40 wound around the first opening / closing sheave 21 and the second opening / closing sheave 30 can be supported from below even when the first opening / closing sheave 21 is closest to the second opening / closing sheave 30 (the state of FIG. 5).

[0067] Next, the connecting members that interconnect the base arm 11, the sheave mounting member 14, and the plurality of rope support devices 49 will be described with reference to FIGS.

[0068] A front hook 65 is provided at the rear end of the lower plate 11D constituting the base arm 11. A rear hook 66 is provided at the front end of the lower plate 14D constituting the sheave mounting member 14. A U-shaped hook 67 protruding downward is provided on the lower surface of the lower plate 50E constituting the base member 50 of the rope support device 49.

[0069] The rope support device 49 closest to the sheave mounting member 14 is connected to the sheave mounting member 14 via a first connecting rope 68 as a connecting member. One end (rear end) of the first connecting rope 68 is connected to the rear hanging fixture 66 of the sheave mounting member 14, and the other end (front end) of the first connecting rope 68 is connected to a hook 67 of the rope support device 49. The rope support device 49 closest to the second lifting sheave 23 and the second opening / closing sheave 30 is connected to the base arm 11 via a second connecting rope 69 as a connecting member. One end (rear end) of the second connecting rope 69 is connected to the hook 67 of the rope support device 49, and the other end (front end) of the second connecting rope 69 is connected to the front hanging fixture 65 of the base arm 11. Two adjacent rope support devices 49 among the multiple rope support devices 49 are connected to each other via three third connecting ropes 70 as connecting members. That is, one end and the other end of a third connecting rope 70 are connected to the hooks 67 provided on the four rope support devices 49 .

[0070] 2, when the lifting cylinder 18 extends and the sheave mounting member 14 moves in a direction away from the base arm 11, and the four rope support devices 49 are furthest from each other, the first connecting rope 68, the second connecting rope 69, and the third connecting rope 70 are in a continuous separated position in a linear, tensioned state. Here, in this embodiment, the length dimension of the first connecting rope 68 is set to be smaller than the length dimension of the third connecting rope 70, and the three third connecting ropes 70 are set to be equal in length. In addition, if the four rope support devices 49 are designated as the first, second, third and fourth rope support devices 49 in order from the sheave mounting member 14 (the first lifting / lowering sheave 19 or the first opening / closing sheave 21) toward the base arm 11, as shown in FIG. 2, the distance S1 between the first lifting / lowering sheave 19 (the center of the first lifting / lowering sheave 19 or the first opening / closing sheave 21) and the first rope support device 49, the distance S2 between the first and second rope support devices 49, the distance S3 between the second and third rope support devices 49, and the distance S4 between the third and fourth rope support devices 49 are set to be approximately equal (S1=S2=S3=S4).

[0071] On the other hand, as shown in Fig. 4, when the lifting cylinder 18 contracts and the sheave mounting member 14 approaches the base arm 11, the multiple rope support devices 49 are pressed by the sheave mounting member 14, and move sequentially toward the base arm 11 starting from the rope support device 49 closest to the sheave mounting member 14. Then, as shown in Fig. 5 and Fig. 9, when the sheave mounting member 14 approaches the base arm 11 closest and the multiple rope support devices 49 come into contact with each other, the first connecting rope 68, the second connecting rope 69 and the third connecting rope 70 each assume an approaching position in which they are slackened downward in a U-shape.

[0072] In this way, the first connecting rope 68, the second connecting rope 69, and the third connecting rope 70 are deformed between the separated position shown in Fig. 2 and the approaching position shown in Fig. 5 according to the extension and contraction of the lifting cylinder 18. For this reason, the first connecting rope 68, the second connecting rope 69, and the third connecting rope 70 are attached to the portions where deformation between the separated position and the approaching position is permitted, that is, the front hook 65 provided on the lower surface plate 11D of the base arm 11, the rear hook 66 provided on the lower plate 14D of the sheave mounting member 14, and the hook 67 provided on the lower plate 50E of the base member 50 constituting the rope support device 49. Note that in the embodiment, a case is illustrated in which the hook 67 for connecting the first connecting rope 68, the second connecting rope 69, and the third connecting rope 70 to the rope support device 49 is attached to the lower plate 50E of the base member 50 constituting the rope support device 49. However, the present invention is not limited to this, and the hook may be attached to a location where deformation of the first, second and third connecting ropes 68, 69 and 70 between the separated and approached positions is allowed, such as the left side plate 50A of the base member 50, the horizontal pipe 56 of the roller support frame 55 and the vertical plate 57 of the roller support frame 55.

[0073] The deep foundation excavator 1 according to this embodiment has the configuration as described above, and the operation of excavating a vertical shaft using the deep foundation excavator 1 will be described below.

[0074] The operator in the cab 4 operates the boom cylinder 7 to lift the tip of the boom 6 upward, and operates the arm cylinder 8 to hold the arm 10 in a position extending in the front-rear direction (horizontal to the ground or with the front end slightly upward). Next, the clamshell bucket 9 is placed above the ground where the shaft is to be excavated, and the lifting cylinder 18 is contracted. As a result, the sheave mounting member 14 moves forward along the upper guide arm 12 and the lower guide arm 13, and the first lifting sheave 19 approaches the second lifting sheave 23, and the first opening / closing sheave 21 approaches the second opening / closing sheave 30. As a result, the lifting rope 38 and the opening / closing rope 40 are sent out from the arm 10, and the clamshell bucket 9 descends.

[0075] When the clamshell bucket 9 approaches the ground, the operator retracts the opening / closing cylinder 31. As a result, the second opening / closing sheave 30 attached to the opening / closing sheave moving mechanism 25 approaches the first opening / closing sheave 21, the opening / closing rope 40 is let out from the arm 10, and the pair of buckets 9B of the clamshell bucket 9 are fully opened. With the clamshell bucket 9 in the fully open state, the operator retracts the lifting cylinder 18, causing the pair of buckets 9B of the clamshell bucket 9 to sink into the ground under their own weight.

[0076] Next, before closing the clamshell bucket 9, the operator extends the slack adjustment cylinder 48, and moves the slack adjustment sheave 47 attached to the slack adjustment sheave moving mechanism 42 away from the second opening / closing sheave 30. As a result, the lift rope 38 remains slack, and only the slack in the opening / closing rope 40 is removed. In this state, the operator extends the opening / closing cylinder 31, and moves the second opening / closing sheave 30 attached to the opening / closing sheave moving mechanism 25 away from the first opening / closing sheave 21, thereby pulling up the opening / closing rope 40 toward the arm 10. As a result, the clamshell bucket 9 closes while sinking into the ground under its own weight, and can scoop up a large amount of earth and sand.

[0077] After closing the clamshell bucket 9 and scooping up the soil, the operator extends the lift cylinder 18. As a result, the first lifting sheave 19 attached to the sheave mounting member 14 moves away from the second lifting sheave 23, the lifting rope 38 is pulled up toward the arm 10, the first opening / closing sheave 21 moves away from the second opening / closing sheave 30, and the opening / closing rope 40 is pulled up toward the arm 10. As a result, the lifting rope 38 and the opening / closing rope 40 are pulled up together toward the arm 10, and the clamshell bucket 9, holding the soil, is lifted up by the lifting rope 38 and the opening / closing rope 40.

[0078] After the clamshell bucket 9 has been raised to the outside of the shaft, for example, the upper rotating body 3 is rotated to move the clamshell bucket 9 above the bed of a dump truck (not shown). In this state, the operator contracts the opening / closing cylinder 31 and moves the second opening / closing sheave 30 attached to the opening / closing sheave moving mechanism 25 closer to the first opening / closing sheave 21. As a result, the opening / closing rope 40 is pulled out from the arm 10, and the clamshell bucket 9 opens, allowing the excavated soil to be discharged onto the bed of the dump truck.

[0079] Here, when the deep foundation excavator 1 is excavating a vertical shaft, for example, the opening and closing rope 40 becomes slack downward between the first opening and closing sheave 21 and the second opening and closing sheave 30. In particular, when the excavation depth of the vertical shaft is small (shallow) and the first opening and closing sheave 21 is far away from the second opening and closing sheave 30, the opening and closing rope 40 becomes loose and there is a concern that it may fall off the first opening and closing sheave 21 or the second opening and closing sheave 30. In addition, due to the impact of the clamshell bucket 9 starting to move when it performs a lifting and lowering operation or an opening and closing operation, for example, the opening and closing rope 40 may swing widely and rub against the first opening and closing sheave 21 or the second opening and closing sheave 30, causing early wear.

[0080] In contrast, in this embodiment, the opening / closing rope 40 wound around the first opening / closing sheave 21 and the second opening / closing sheave 30 is supported from below by a plurality of rope support devices 49 provided movably in the length direction of the arm 10 along the upper guide arm 12 and the lower guide arm 13. Specifically, as shown in FIG. 14, when a shaft is excavated with the front end side of the arm 10 (the front end 11E side of the base arm 11) tilted upward, even if the opening / closing rope 40 slackens downward between the first opening / closing sheave 21 and the second opening / closing sheave 30, the opening / closing rope 40 can be supported from below by the plurality of rope support devices 49. Then, when the lifting cylinder 18 contracts and the sheave mounting member 14 approaches the base arm 11, the plurality of rope support devices 49 are pressed by the sheave mounting member 14 to move sequentially from the rope support device 49 closest to the sheave mounting member 14 toward the base arm 11 while continuing to support the opening / closing rope 40.

[0081] This makes it possible to prevent the opening / closing rope 40 from slackening significantly downward between the first opening / closing sheave 21 and the second opening / closing sheave 30, and to prevent the opening / closing rope 40 from falling off the first opening / closing sheave 21 or the second opening / closing sheave 30 during the excavation work of the shaft. In addition, by supporting the opening / closing rope 40 with a plurality of rope support devices 49, it is possible to prevent the opening / closing rope 40 from swinging significantly due to the impact of the clamshell bucket 9 starting to move when it performs its lifting / lowering or opening / closing operation. As a result, it is possible to prevent the opening / closing rope 40 from rubbing against the first opening / closing sheave 21 or the second opening / closing sheave 30 and early wear, thereby extending the life of the opening / closing rope 40.

[0082] Moreover, by supporting the opening / closing rope 40 by a plurality of rope support devices 49, it is possible to suppress the opening / closing rope 40 wound around the first opening / closing sheave 21 and the second opening / closing sheave 30 from sagging significantly. In addition, by supporting the opening / closing rope 40 by the rope support device 49, it is possible to reduce the weight of the opening / closing rope 40 on the first opening / closing sheave 21 and the second opening / closing sheave 30, that is, the force that inhibits the relative displacement between the opening / closing rope 40 and the first opening / closing sheave 21 and the second opening / closing sheave 30, for example. As a result, when the clamshell bucket 9 (bucket 9B) is lowered in an open state, the opening / closing rope 40 can be paid out to follow the descent speed of the clamshell bucket 9. As a result, the clamshell bucket 9 can be made to sink into the ground by its own weight while maintaining the open state, and excavation performance can be improved.

[0083] Thus, in the embodiment, the working device 5 provided on the upper rotating body 3 includes an arm 10 rotatably provided with respect to the upper rotating body 3, a first lifting sheave 19 and a first opening / closing sheave 21 provided on the arm 10 so as to be movable in the length direction thereof, a second lifting sheave 23 and a second opening / closing sheave 30 provided on the arm 10 at a distance from the first lifting sheave 19 and the first opening / closing sheave 21, respectively, and a work mechanism wound around the first lifting sheave 19 and the second lifting sheave 23 to lift and lower the clamshell bucket 9. In the deep foundation excavator 1 which is provided with a lifting rope 38 and an opening / closing rope 40 wound around the first opening / closing sheave 21 and the second opening / closing sheave 30 for opening and closing the clamshell bucket 9, a rope support device 49 which supports at least one of the lifting rope 38 and the opening / closing rope 40 is provided movably in the longitudinal direction of the arm 10 at least one between the first lifting sheave 19 and the second lifting sheave 23 in the arm 10, and at least one between the first opening / closing sheave 21 and the second opening / closing sheave 30.

[0084] According to this configuration, at least one of the lifting rope 38 and the opening / closing rope 40 is supported by the rope support device 49, so that it is possible to prevent at least one of the lifting rope 38 and the opening / closing rope 40 from becoming significantly slack during the excavation work of a vertical shaft using the deep foundation drilling machine 1. As a result, it is possible to prevent the lifting rope 38 from falling off the first lifting sheave 19 or the second lifting sheave 23, and / or the opening / closing rope 40 from falling off the first opening / closing sheave 21 or the second opening / closing sheave 30.

[0085] In the embodiment, a plurality of rope support devices 49 are provided lined up in the longitudinal direction of the arm 10, and the plurality of rope support devices 49 are connected to each other via a connecting member. According to this configuration, the lifting rope 38 wound around the first lifting sheave 19 and the second lifting sheave 23, and / or the opening / closing rope 40 wound around the first opening / closing sheave 21 and the second opening / closing sheave 30 are supported by the plurality of rope support devices 49, thereby making it possible to prevent the lifting rope 38 and / or the opening / closing rope 40 from becoming significantly slack.

[0086] In the embodiment, the first lifting sheave 19 and the first opening / closing sheave 21 are attached to a sheave mounting member 14 that is movably provided on the arm 10 in the longitudinal direction, and the connecting member includes a first connecting rope 68 that connects between the sheave mounting member 14 and the rope support device 49 closest to the sheave mounting member 14 among the multiple rope support devices 49, a second connecting rope 69 that connects between the arm 10 (base arm 11) and the rope support device 49 closest to the second lifting sheave 23 and the second opening / closing sheave 30 among the multiple rope support devices 49, and a third connecting rope 70 that connects between two adjacent rope support devices 49 among the multiple rope support devices 49. According to this configuration, when the sheave mounting member 14 moves in a direction away from the base arm 11, multiple rope support devices 49 can be positioned between the first lifting / lowering sheave 19 and the first opening / closing sheave 21 and the second lifting / lowering sheave 23 and the second opening / closing sheave 30 while maintaining an appropriate distance from each other.

[0087] In the embodiment, the first, second and third connecting ropes 68, 69 and 70 deform between a distant position when the multiple rope support devices 49 are farthest from each other and a close position in which they are slackened downward when the multiple rope support devices 49 are closest to each other, and the first, second and third connecting ropes 68, 69 and 70 are attached to a portion of the rope support device 49 where deformation between the distant position and the close position is permitted. With this configuration, the multiple rope support devices 49 can reliably support the lifting ropes 38 and / or the opening / closing ropes 40 while moving in response to changes in the distance between the first lifting / lowering sheave 19 and the first opening / closing sheave 21 and the second lifting / lowering sheave 23 and the second opening / closing sheave 30.

[0088] In the embodiment, the rope support device 49 includes a base member 50 that is movable in the length direction of the arm 10 while being guided by the arm 10 (upper guide arm 12 and lower guide arm 13), an upper shaft member 58 and a lower shaft member 59 that protrude from the base member 50 toward the lower side of at least one of the lifting ropes 38 and the opening / closing ropes 40, and rope receivers that are attached to the upper shaft member 58 and the lower shaft member 59 and support at least one of the lifting ropes 38 and the opening / closing ropes 40 from below. With this configuration, while the base member 50 moves in the length direction of the arm 10, the lifting ropes 38 and / or the opening / closing ropes 40 can be supported from below by the rope receivers attached to the upper shaft member 58 and the lower shaft member 59.

[0089] In the embodiment, the rope receiver is composed of rollers 60, 61 attached rotatably and axially movable relative to the upper shaft member 58 and the lower shaft member 59. With this configuration, the rollers 60, 61 can support the lifting rope 38 and / or the opening / closing rope 40 while rotating relative to the upper shaft member 58 and the lower shaft member 59, and wear of the lifting rope 38 and / or the opening / closing rope 40 can be suppressed. Even if the lifting rope 38 and / or the opening / closing rope 40 are displaced in a direction perpendicular to the length direction, the rollers 60, 61 can support the lifting rope 38 and / or the opening / closing rope 40 while moving in the axial direction of the upper shaft member 58 and the lower shaft member 59 in response to the displacement of the lifting rope 38 and / or the opening / closing rope 40.

[0090] In the embodiment, an upper bearing 50H, a lower bearing 50J, and a slide plate 51 that guide the base member 50 along the length direction of the arm 10 are provided between the base member 50 and the arm 10 (upper guide arm 12 and lower guide arm 13). According to this configuration, the base member 50 can move smoothly in the length direction of the arm 10 by being guided by the upper bearing 50H, the lower bearing 50J, and the slide plate 51. In the embodiment, the base member 50 is formed in a frame shape so as to surround the side of the arm 10. The base member 50 has a structure that allows it to be removed from the side of the arm 10. This allows, for example, the base member 50 to be removed independently from the arm 10 without removing the sheave mounting member 14 from the arm 10 (e.g., guide arms 12 and 13). This allows the rope support device 49 as a whole to have a structure that allows it to be removed from the side of the arm 10. This structure greatly improves the ease of maintenance work, such as replacing the rope support device 49.

[0091] In the embodiment, the arm 10 (base arm 11) is provided with a rope support 64 positioned between the rope support device 49 that is closest to the second opening / closing sheave 30 among the multiple rope support devices 49 and the second opening / closing sheave 30, and supporting at least one of the lifting rope 38 and the opening / closing rope 40. With this configuration, even when the first opening / closing sheave 21 is closest to the second opening / closing sheave 30 (the state in FIG. 5), the opening / closing rope 40 wound around the first opening / closing sheave 21 and the second opening / closing sheave 30 can be supported from below by the rope support 64.

[0092] Next, Fig. 15 shows an arm, rope support device, etc. according to a second embodiment of the present invention. This embodiment is characterized in that the distance between the rope support device closest to the sheave mounting member and the sheave mounting member is set smaller than the distance between two adjacent rope support devices, and the distance between two adjacent rope support devices is set smaller on the sheave mounting member side compared to the second lifting sheave and second opening / closing sheave sides. In this embodiment, the same components as in the first embodiment are given the same reference numerals, and their explanations are omitted.

[0093] In the drawing, four rope support devices 49 are provided on the upper guide arm 12 and the lower guide arm 13 constituting the arm 10, and these four rope support devices 49 are connected to each other via a third connecting rope 70. Also, the sheave mounting member 14 and the first rope support device 49 are connected to each other via a first connecting rope 68, and the base arm 11 and the fourth rope support device 49 are connected to each other via a second connecting rope 69. However, in this embodiment, the length dimensions of the first connecting rope 68, the second connecting rope 69, and the third connecting rope 70 are different from those in the first embodiment, and the interval between the sheave mounting member 14 and the first rope support device 49 is set to be smaller than the interval between two adjacent rope support devices 49, and the intervals between two adjacent rope support devices 49 are different from each other.

[0094] Further, the distance S1 between the first hoisting sheave 19 or the first opening / closing sheave 21 (its center) and the first rope support device 49 is smaller than the distance S2 between the first and second rope support devices 49, the distance S2 is smaller than the distance S3 between the second and third rope support devices 49, and the distance S3 is smaller than the distance S4 between the third and fourth rope support devices 49 (S1 < S2 < S3 < S4). Thus, in this embodiment, with the sheave attachment member 14 being in the state furthest from the second hoisting sheave 23 and the second opening / closing sheave 30, the distance S1 between the first rope support device 49 closest to the sheave attachment member 14 and the first hoisting sheave 19 or the first opening / closing sheave 21 is set to be smaller than the distances S2, S3, S4 between two adjacent rope support devices 49, and the distances S2, S3, S4 between two adjacent rope support devices 49 are set to be smaller on the side of the sheave attachment member 14 than on the side of the second hoisting sheave 23 and the second opening / closing sheave 30 (the base arm 11 side).

[0095] The deep foundation excavator 1 according to the second embodiment has the configuration as described above, and there is no particular difference in its basic operation from that according to the first embodiment. However, in this embodiment, the distance S1 between the first rope support device 49 closest to the sheave attachment member 14 and the first hoisting sheave 19 or the first opening / closing sheave 21 is set to be smaller than the distances S2, S3, S4 between two adjacent rope support devices 49, and the distances S2, S3, S4 between two adjacent rope support devices 49 are set to be smaller on the side of the sheave attachment member 14 than on the side of the second hoisting sheave 23 and the second opening / closing sheave 30 (S1 < S2 < S3 < S4).

[0096] Here, when excavating a shaft in a posture where the front end side of the arm 10 (the front end 11E side of the base arm 11) is inclined upward, if the opening and closing rope 40 sags between the first opening and closing sheave 21 and the second opening and closing sheave 30, the sag of the opening and closing rope 40 will tend to bias toward the first opening and closing sheave 21 side (the sheave attachment member 14 side) due to its own weight. In contrast, in the present embodiment, the intervals S4, S3, S2 between adjacent rope support devices 49 from the fourth rope support device 49 toward the first rope support device 49 become smaller, and the interval S1 between the first rope support device 49 and the first lifting sheave 19 or the first opening and closing sheave 21 is set to be the smallest. Thereby, even if the sag of the opening and closing rope 40 biases toward the first opening and closing sheave 21 side, the four rope support devices 49 can be appropriately arranged according to the bias of the opening and closing rope 40. As a result, the sag of the opening and closing rope 40 can be suppressed, and the opening and closing rope 40 can be prevented from falling off from the first opening and closing sheave 21 or the second opening and closing sheave 30.

[0097] In the second embodiment, the interval S1 between the first rope support device 49 and the first lifting sheave 19 or the first opening and closing sheave 21 is set to be smaller than the intervals S2, S3, S4 between two adjacent rope support devices 49, and the intervals S2, S3, S4 between two adjacent rope support devices 49 are set to be smaller on the sheave attachment member 14 side compared to the second lifting sheave 23 and the second opening and closing sheave 30 side (S1 < S2 < S3 < S4). However, the present invention is not limited to this. For example, as in the modification shown in FIG. 16, the interval S1 between the first rope support device 49 and the first lifting sheave 19 or the first opening and closing sheave 21 is minimized, the interval S2 between the first and second rope support devices 49 is set to be smaller than the interval S3 between the second and third rope support devices 49, and the interval S3 may be set to be equal to the interval S4 between the third and fourth rope support devices 49 (S1 < S2 < S3 = S4).

[0098] Also, in the embodiment, a configuration is exemplified in which the multiple rope support devices 49 support only the opening / closing ropes 40 wound around the first opening / closing sheave 21 and the second opening / closing sheave 30. However, the present invention is not limited to this, and the rope support devices 49 may support the opening / closing ropes 40 and the lifting ropes 38 simultaneously, or the rope support devices 49 may support only the lifting ropes 38.

[0099] Furthermore, in the embodiment, a configuration in which the opening / closing ropes 40 are supported by multiple rope support devices 49 has been exemplified, but the present invention is not limited to this, and for example, a configuration in which the opening / closing ropes 40 and / or the lifting ropes 38 are supported by a single rope support device 49 may also be used. [Explanation of symbols]

[0100] 1 Deep foundation excavator 2 Undercarriage (car body) 3 Upper rotating body (car body) 5. Working Equipment 9. Clamshell Bucket 10 Arm 14 Sheave mounting member 19 First lift sheave 21 First opening and closing sheave 23 Second lift sheave 30 Second opening and closing sheave 38 Ascending and Descending Rope 40 Opening and closing rope 49 Rope support device 50 Base material 50H Upper bearing (guide member) 50J Lower bearing (guide part) 51 Slide plate (guide member) 58 Upper shaft member (shaft member) 59 Lower shaft member (shaft member) 60,61 Roller (rope holder) 64 Rope Support 68 First connecting rope (connecting member) 69 Second connecting rope (connecting member) 70 Third connecting rope (connecting member)

Claims

1. The vehicle comprises a self-propelled vehicle body and a working device having a clamshell bucket and provided on the vehicle body, The working device includes an arm rotatably provided with respect to the vehicle body; a first lifting sheave and a first opening / closing sheave provided on the arm so as to be movable in the longitudinal direction thereof; a second lifting sheave and a second opening / closing sheave provided on the arm, respectively, spaced apart from the first lifting sheave and the first opening / closing sheave; a lifting rope wound around the first lifting sheave and the second lifting sheave to lift and lower the clamshell bucket; An opening and closing rope that is wound around the first opening and closing sheave and the second opening and closing sheave and opens and closes the clamshell bucket. A deep foundation excavator characterized in that a rope support device that supports at least one of the lifting rope between the first lifting sheave and the second lifting sheave in the arm and the opening and closing rope between the first opening and closing sheave and the second opening and closing sheave is arranged to be movable in the longitudinal direction of the arm.

2. The first lifting sheave and the first opening / closing sheave are attached to a sheave mounting member that is movable in the length direction of the arm, a first connecting rope connecting the rope support device and the sheave mounting member; The deep foundation excavator according to claim 1, further comprising a second connecting rope connecting the rope support device and the arm.

3. A plurality of the rope support devices are provided side by side in the length direction of the arm, 2. The deep foundation excavator according to claim 1, wherein the plurality of rope support devices are connected to each other via connecting members.

4. the first lifting sheave and the first opening / closing sheave are attached to a sheave attachment member that is provided so as to be movable in the length direction of the arm, The connecting member includes a first connecting rope that connects the rope support device closest to the sheave mounting member among the plurality of rope support devices to the sheave mounting member; a second connecting rope connecting the arm to a rope support device among the plurality of rope support devices that is closest to the second lifting sheave and the second opening / closing sheave; The deep foundation excavator according to claim 3, further comprising a third connecting rope connecting two adjacent rope support devices among the plurality of rope support devices.

5. the first, second, and third connecting ropes are deformed between a distant position when the plurality of rope support devices are farthest from each other and a close position in which the plurality of rope support devices are slackened downward when the plurality of rope support devices are closest to each other, A deep foundation excavator as described in claim 4, characterized in that the first, second, and third connecting ropes are attached to portions of the rope support device that are allowed to deform between the separated position and the close position.

6. The rope support device includes a base member that is guided by the arm and can move in the length direction of the arm; a shaft member protruding from the base member; 2. The deep foundation excavator according to claim 1, further comprising a rope receiver attached to the shaft member and supporting the rope from below.

7. 7. A deep foundation excavator according to claim 6, wherein the rope receiver is constituted by a roller attached rotatably and axially movable relative to the shaft member.

8. The deep foundation excavator according to claim 6, characterized in that a guide member is provided between the base member and the arm to guide the base member along the length of the arm.

9. The deep foundation excavator according to claim 6, characterized in that the base member is formed in a frame shape so as to surround the side of the arm and has a structure that allows it to be removed from the side of the arm.

10. A deep foundation excavator as described in claim 3, characterized in that the arm is provided with a rope support device that supports the rope and is positioned between the rope support device among the multiple rope support devices that is closest to the second lifting sheave and the second opening and closing sheave, and the second lifting sheave and the second opening and closing sheave.

11. When the sheave mounting member is at the farthest position from the second lifting sheave and the second opening / closing sheave, a distance between the rope support device among the plurality of rope support devices that is closest to the sheave mounting member and the first lifting sheave or the first opening / closing sheave is set to be smaller than a distance between two adjacent rope support devices among the plurality of rope support devices, A deep foundation excavator as described in claim 4, characterized in that the distance between two adjacent rope support devices among the plurality of rope support devices is set smaller on the sheave mounting member side than on the second lifting sheave and second opening / closing sheave side.

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