Deep foundation excavator

Abstract

To perform various tasks while visually observing a tag line winch from a driver's seat.SOLUTION: A work device 11 includes a first boom 12, a second boom 13 attached to a tip of the first boom 12, an arm 16 attached to a tip of the second boom 13, a clamshell bucket 43 supported by a lifting rope 39 let out from the arm 16, and a tag line winch 47 for winding and unwinding a steadying rope 51 connected to the clamshell bucket 43. The tag line winch 47 is provided on a back surface 12C of the first boom 12, and the tag line winch 47 is disposed at a position laterally facing the driver's seat 5A or in front of the driver's seat 5A.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Deep foundation excavators based on the chassis of hydraulic excavators are known as construction machines that excavate shafts in the ground and unload the excavated soil. In this deep foundation excavator, an arm equipped with a bucket lifting and opening device is attached to the end of the boom of the hydraulic excavator, and the excavation bucket is supported so that it can be raised and lowered by a lifting rope that is reeled out from the arm. The deep foundation excavator excavates a shaft in the ground by raising and lowering and opening and closing the excavation bucket using the bucket lifting and opening device.

[0003] Here, it is known that a hydraulic crane equipped with an excavation bucket is provided with a tag line winch that winds and unwinds an anti-sway rope connected to the excavation bucket in order to suppress the swinging of the excavation bucket. The tag line winch prevents the excavation bucket from swinging and rotating by winding and unwinding the anti-sway rope when the excavation bucket is raised and lowered (Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 62-26387 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the tag line winch in Patent Document 1 is disposed under the boom at the front end side of the rotating frame of the hydraulic crane, which makes it difficult for the operator to simultaneously see the rope wound around the tag line winch and the excavation bucket, resulting in a problem that it is difficult to operate the tag line winch according to the swinging state of the excavation bucket.

[0006] An object of the present invention is to provide a deep foundation excavator that allows the operator to perform various operations while visually observing the tag line winch from the operator's seat. [Means for solving the problem]

[0007] The present invention relates to a deep foundation excavator comprising a self-propelled vehicle body provided with a cab having a driver's seat, and a working device provided on the vehicle body, the working device comprising a first boom having a base end rotatably attached to the vehicle body, a second boom rotatably attached to the tip of the first boom, an arm rotatably attached to the tip of the second boom, an excavation bucket supported by a lifting rope reeled out from the arm, and a tag line winch for winding in and unwinding an anti-vibration rope connected to the excavation bucket, the tag line winch being provided on the back of the first boom, and being positioned laterally opposite the driver's seat or forward of the driver's seat. Effect of the Invention

[0008] According to the present invention, during excavation work, the tag line winch arranged in front of the operator's seat and the excavation bucket can be simultaneously viewed while the tag line winch is operated. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a left side view showing a deep foundation excavator according to an embodiment of the present invention in a working position. [Diagram 2] This is a left side view showing the deep foundation excavator loaded onto a transport vehicle in a transport position. [Diagram 3] FIG. 2 is a plan view of the arm of the deep foundation excavator from above. [Figure 4] This is a partially broken plan view from above of the arm support member and tag line winch attached to the first boom of a deep foundation excavator. [Diagram 5]FIG. 1 is a partially cutaway plan view showing the arm, clamshell bucket, anti-vibration rope, anti-vibration sheave, second anti-vibration sheave, tag line winch, etc., viewed from above. [Figure 6] FIG. 2 is an enlarged left side view of essential parts showing the first boom, the arm receiving member, the tag line winch, etc. [Figure 7] 7 is a cross-sectional view of the first boom, the arm receiving member, the tag line winch, etc., viewed from the direction of arrows VII-VII in FIG. 6 with the positioning cylinder removed. [Figure 8] FIG. 8 is a cross-sectional view showing the common base frame in FIG. 7 with the tag line winch removed. [Figure 9] 9 is a plan view of the arm receiving member as viewed from the direction of arrows IX-IX in FIG. 8. [Figure 10] 10 is a cross-sectional view of the position adjustment mechanism for the arm receiving member as viewed from the direction of the arrow XX in FIG. 9. [Figure 11] This is a left side view showing the vibration stop rope, vibration stop sheave, second vibration stop sheave, etc. [Figure 12] 12 is a cross-sectional view of the vibration-proof sheave as viewed from the direction of arrows XII-XII in FIG. 11. [Figure 13] 13 is a cross-sectional view of the second anti-vibration sheave as viewed from the direction of arrows XIII-XIII in FIG. 11. [Figure 14] FIG. 13 is a left side view showing the arm, anti-vibration rope, anti-vibration sheave, hydraulic lines, etc. [Figure 15] 15 is a cross-sectional view of the vibration-stopping ropes, vibration-stopping sheaves, hydraulic lines, etc., as viewed from the direction of arrows XV-XV in FIG. 14. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the deep foundation excavator according to the present invention will be described in detail with reference to Figures 1 to 15. In the embodiment, the traveling direction of the deep foundation excavator will be described as the front-rear direction, and the direction perpendicular to the traveling direction will be described as the left-right direction.

[0011] In Fig. 1, a 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 11 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. The working device 11 is used for excavating a shaft 100 deep underground.

[0012] The upper rotating body 3 has a rotating frame 4 that is rotatably attached to the lower traveling body 2. The rotating frame 4 constitutes the base of the upper rotating body 3 and is provided with left and right vertical plates that face each other in the left-right direction and extend in the front-rear direction. A first boom 12 and a boom cylinder 14, which will be described later, are rotatably attached to the front ends of the left and right vertical plates.

[0013] A cab 5 that defines the operator's compartment is mounted on the front left side of the revolving frame 4. A driver's seat 5A where an operator sits is provided inside the cab 5, and around the driver's seat 5A, a travel lever and pedal device that controls the travel operation of the lower traveling body 2, the rotation operation of the upper revolving body 3, and an operation lever device (none of which are shown) that controls the operation of the working equipment 11 are arranged. A counterweight 6 that balances the weight with the working equipment 11 is provided on the rear end side of the revolving frame 4. An exterior cover 7 that houses a prime mover, a hydraulic pump, etc. (none of which are shown) is provided in front of the counterweight 6.

[0014] The working device 11 includes a first boom 12 having a base end rotatably attached to the rotating frame 4 of the upper rotating body 3, a second boom 13 rotatably attached to the tip of the first boom 12, an arm 16 (described later) rotatably attached to the tip of the second boom 13, and a clamshell bucket 43 (described later) supported on the tip of the arm 16 via a lifting rope 39 and an opening / closing rope 41.

[0015] The first boom 12 is rotatably attached to the swivel frame 4. The first boom 12 is formed as a rectangular tube having a square cross section, with a left side surface 12A and a right side surface 12B that face each other at a fixed distance in the left-right direction, and a back surface 12C and a ventral surface 12D that face each other in the up-down direction with the left side surface 12A and the right side surface 12B in between. The back surface 12C of the first boom 12 becomes the upper surface when the first boom 12 is extended in the front-rear direction (the state shown in FIG. 1), and the ventral surface 12D of the first boom 12 becomes the lower surface when the first boom 12 is extended in the front-rear direction.

[0016] The base end of the first boom 12 is rotatably connected to the front ends of the left and right vertical plates constituting the revolving frame 4 by using a pin. The base end of the second boom 13 is rotatably connected to the tip of the first boom 12. Two sets of cylinder brackets 12E protrude from the back surface 12C of the first boom 12. As shown in FIG. 7, each of the two sets of cylinder brackets 12E is composed of a pair of plates facing each other in the left-right direction, and the bottom side of a positioning cylinder 15 described below and a common base frame 44 are attached to it.

[0017] The second boom 13 is rotatably attached to the tip of the first boom 12. The second boom 13 is formed as a rectangular tube having a square cross section, with a left side surface 13A and a right side surface 13B facing each other at a fixed distance in the left-right direction, and a back surface 13C and a ventral surface 13D facing each other in the up-down direction with the left side surface 13A and the right side surface 13B in between. The back surface 13C of the second boom 13 becomes the upper surface when the second boom 13 is extended in the front-rear direction, and the ventral surface 13D of the second boom 13 becomes the lower surface when the second boom 13 is extended in the front-rear direction.

[0018] The base end of the second boom 13 is rotatably connected to the tip of the first boom 12 by a connecting pin 13E. A bifurcated arm bracket 13F is provided at the tip of the second boom 13, and an arm 16 is rotatably connected to the arm bracket 13F. A cylinder bracket 13G protrudes from the back surface 13C of the second boom 13, and the rod side of a positioning cylinder 15 is attached to the cylinder bracket 13G. In addition, a cylinder bracket 13H protrudes from the ventral surface 13D of the second boom 13, and the bottom side of an arm cylinder 18, which will be described later, is attached to the cylinder bracket 13H.

[0019] The boom cylinder 14 is provided between the left and right vertical plates constituting the revolving frame 4 and the first boom 12. One boom cylinder 14 is disposed on each of the left and right sides of the first boom 12, and the bottom sides of the boom cylinders 14 are rotatably connected to the left and right vertical plates of the revolving frame 4 by a pin. The rod sides of the boom cylinder 14 are rotatably connected to the left side surface 12A and the right side surface 12B of the first boom 12 by a pin, respectively. Therefore, the first boom 12 rotates (elevates and lowers) in the vertical direction around the connection part with the revolving frame 4 by extending and retracting the boom cylinder 14.

[0020] Two positioning cylinders 15 are provided between the first boom 12 and the second boom 13, and rotate the second boom 13 relative to the first boom 12. The bottom side of the positioning cylinders 15 is rotatably pin-connected to a cylinder bracket 12E protruding from the back surface 12C of the first boom 12. The rod side of the positioning cylinders 15 is rotatably pin-connected to a cylinder bracket 13G protruding from the back surface 13C of the second boom 13. Therefore, by extending and retracting the positioning cylinders 15, the second boom 13 rotates up and down about the connection part (connecting pin 13E) with the first boom 12.

[0021] The arm 16 is rotatably attached to the tip of the second boom 13. As shown in Figures 1 and 3, the arm 16 includes an arm body 17 formed of a hollow cylinder and extending in the front-rear direction, a guide arm 19 provided on the rear side of the arm body 17, and a sheave mounting member 20 movably attached to the guide arm 19.

[0022] The arm body 17 is the base of the arm 16 and is formed as a square cylinder having a rectangular cross section. The arm body 17 is surrounded by a left side plate 17A and a right side plate 17B that face each other at a certain interval in the left-right direction, an upper plate 17C that connects the upper ends of the left side plate 17A and the right side plate 17B, and a lower plate 17D that connects the lower ends of the left side plate 17A and the right side plate 17B. The front end 17E of the arm body 17 is closed, and the rear end 17F of the arm body 17 is an open end. A boom mounting bracket 17G and a cylinder mounting bracket 17H are protruding from the center of the lower plate 17D of the arm body 17 in the longitudinal direction (front-rear direction). The boom mounting bracket 17G is rotatably connected to the tip of the second boom 13 via a connecting pin 17J.

[0023] The arm cylinder 18 is located on the abdominal surface 13D side of the second boom 13 and is provided between the second boom 13 and the arm 16. The bottom side of the arm cylinder 18 is pin-connected to the cylinder bracket 13H of the second boom 13, and the rod side of the arm cylinder 18 is pin-connected to the cylinder mounting bracket 17H of the arm body 17. Therefore, the arm body 17 rotates in the vertical direction about the connection part (connection pin 17J) with the second boom 13 in response to the extension and retraction movement of the arm cylinder 18. This allows the height of the tip (front end) of the arm 16 to be appropriately changed in accordance with the work site.

[0024] When the working device 11 is in the working posture shown in FIG. 1, the tip of the arm 16 can be held at a high position, and in this working posture, the shaft 100 is excavated using the clamshell bucket 43. On the other hand, when the working device 11 is in the transport posture shown in FIG. 2, the positioning cylinder 15 is contracted to the minimum and the arm cylinder 18 is extended, so that the tip of the second boom 13 can be brought closest to the first boom 12. This allows the arm 16 connected to the second boom 13 to be moved to a compact transport posture in which it is pulled toward the back surface 12C of the first boom 12. By moving to this transport posture, when the deep foundation excavator 1 is loaded on the loading platform 101A of the trailer 101, the transport length (total length during transport) can be kept within the length limit imposed by the Road Traffic Act and the like, and the workability of the transport work can be improved.

[0025] The two guide arms 19 are detachably attached to the rear side of the arm body 17 in a pair in the up-down direction. Each of the two guide arms 19 is formed as a square cylinder having a rectangular cross section and extends in the front-to-rear direction. The front ends of the two guide arms 19 are detachably attached to the arm body 17, and the rear ends of the two guide arms 19 are connected via a connecting member 19A. As a result, the two guide arms 19 extend rearward from the rear end 17F of the arm body 17 while maintaining a constant distance in the up-down direction.

[0026] The sheave mounting member 20 is movably attached to the guide arm 19 and constitutes a part of the arm 16. The sheave mounting member 20 moves in the front-rear direction along the guide arm 19 with a first lifting sheave 23 and a first opening / closing sheave 24 (described later) attached to it. The sheave mounting member 20 is formed as a short cylinder having a left side plate 20A and a right side plate 20B, and surrounds the two guide arms 19 from the outside. The first lifting sheave 23 is rotatably attached to the left side plate 20A constituting the sheave mounting member 20, and the first opening / closing sheave 24 is rotatably attached to the right side plate 20B.

[0027] The arm 16 is provided with a bucket lifting / opening device 21. The bucket lifting / opening device 21 performs various operations including lifting / lowering and opening / closing of the clamshell bucket 43. The bucket lifting / opening device 21 includes a lifting cylinder 22, a first lifting sheave 23, a first opening / closing sheave 24, a second lifting / opening sheave 25, an opening / closing cylinder 28, a second opening / closing sheave 29, a slack adjustment cylinder 35, a slack adjustment sheave 37, an intermediate guide sheave 38, a lifting rope 39, and an opening / closing rope 41.

[0028] The lifting cylinder 22 is provided in the arm body 17 of the arm 16, and extends along the longitudinal direction of the arm body 17. The lifting cylinder 22 extends or contracts in response to the operation of an operating device provided in the cab 5, thereby lifting or lowering the clamshell bucket 43. The lifting cylinder 22 has a tube 22A and a rod 22B. The tube 22A of the lifting cylinder 22 is attached to the arm body 17, and the rod 22B is attached to the sheave mounting member 20. Therefore, by extending or contracting the lifting cylinder 22, the sheave mounting member 20 moves in the front-rear direction along the guide arm 19.

[0029] The first lifting sheave 23 is rotatably provided on the left side plate 20A of the sheave mounting member 20. A plurality of first lifting sheaves 23 (e.g., five) are provided lined up in the axial direction of a sheave shaft protruding from the left side plate 20A, and are supported rotatably about the sheave shaft relative to the sheave mounting member 20. The first lifting sheave 23 is covered from the outside by a sheave cover 23A.

[0030] The first opening / closing sheave 24 is rotatably provided on the right side plate 20B of the sheave mounting member 20. A plurality of first opening / closing sheaves 24 (e.g., five) are provided lined up in the axial direction of a sheave shaft protruding from the right side plate 20B, and are supported rotatably about the sheave shaft relative to the sheave mounting member 20. The first opening / closing sheave 24 is covered from the outside by a sheave cover 24A.

[0031] The second lifting sheave 25 is provided on the arm body 17 at a distance from the first lifting sheave 23. The second lifting sheave 25 is rotatably provided on the left side plate 17A of the arm body 17. A plurality of second lifting sheaves 25 (for example, four) are provided in line in the axial direction of a sheave shaft protruding from the left side plate 17A, and are supported on the arm body 17 so as to be rotatable about the sheave shaft. Therefore, as the sheave mounting member 20 moves in response to the extension and contraction of the lifting cylinder 22, the first lifting sheave 23 mounted on the sheave mounting member 20 approaches or moves away from the second lifting sheave 25. A lifting rope 39 is wound around the first lifting sheave 23 and the second lifting sheave 25. The second lifting sheave 25 is covered from the outside by a sheave cover 25A.

[0032] A guide rail 26 extending in the longitudinal direction of the arm body 17 is provided at a longitudinal intermediate portion of the right side plate 17B constituting the arm body 17. A sheave support member 27 is engaged with the guide rail 26 so as to be movable in the longitudinal direction, and the sheave support member 27 rotatably supports a second opening / closing sheave 29. An opening / closing cylinder 28 is provided between the arm body 17 and the sheave support member 27. The bottom side of the opening / closing cylinder 28 is attached to the right side plate 17B of the arm body 17 via a bracket 28A, and the rod side of the opening / closing cylinder 28 is attached to the sheave support member 27.

[0033] The second opening / closing sheave 29 is rotatably provided on the sheave support member 27. A plurality of second opening / closing sheaves 29 (for example, four) are provided lined up in the axial direction of a sheave shaft protruding from the sheave support member 27, and are supported on the sheave support member 27 so as to be rotatable about the sheave shaft. Therefore, the sheave support member 27 moves along the guide rail 26 in response to the extension and retraction of the opening / closing cylinder 28, whereby the second opening / closing sheave 29 approaches or moves away from the first opening / closing sheave 24. An opening / closing rope 41 is wound around the first opening / closing sheave 24 and the second opening / closing sheave 29.

[0034] The guide sheave support shaft 30 is provided on the left side plate 17A of the arm body 17 facing the cab 5. The base end of the guide sheave support shaft 30 is fixed to the front end side of the left side plate 17A, and the tip of the guide sheave support shaft 30 protrudes leftward from the left side plate 17A. The guide sheave support shaft 30 rotatably supports the lift guide sheave 31 and the opening / closing guide sheave 32.

[0035] The lifting / lowering guide sheave 31 and the opening / closing guide sheave 32 are rotatably provided on the left side plate 17A on the cab 5 side of the arm body 17 via the guide sheave support shaft 30. The lifting / lowering guide sheave 31 guides the lifting rope 39 wound around the first lifting / lowering sheave 23 and the second lifting / lowering sheave 25 to the clamshell bucket 43. The opening / closing guide sheave 32 guides the opening / closing rope 41 wound around the first opening / closing sheave 24, the second opening / closing sheave 29, the slack adjustment sheave 37, and the intermediate guide sheave 38 to the clamshell bucket 43. The lifting / lowering guide sheave 31 and the opening / closing guide sheave 32 are disposed on the front end side of the left side plate 17A on the cab 5 side of the arm body 17. This allows the operator sitting in the driver's seat 5A in the cab 5 to operate the bucket lifting / opening device 21 while visually checking the state of the lifting rope 39 and the opening / closing rope 41 attached to the clamshell bucket 43.

[0036] A guide rail 33 extending in the longitudinal direction of the arm body 17 is provided on the front end side of the right side plate 17B constituting the arm body 17. A sheave support member 34 is engaged with the guide rail 33 so as to be movable in the longitudinal direction, and the sheave support member 34 rotatably supports a slack adjustment sheave 37. A slack adjustment cylinder 35 is provided between the arm body 17 and the sheave support member 34. The bottom side of the slack adjustment cylinder 35 is attached to the right side plate 17B of the arm body 17 via a bracket 36, and the rod side of the slack adjustment cylinder 35 is attached to the sheave support member 34.

[0037] The slack adjustment sheave 37 is rotatably attached to the sheave support member 34. That is, the slack adjustment sheave 37 is provided on the right side plate 17B of the arm body 17 so as to be movable in the front-rear direction via the guide rail 33 and the sheave support member 34. The slack adjustment sheave 37 is composed of one sheave, and adjusts the slack of the opening / closing rope 41.

[0038] The intermediate guide sheave 38 is rotatably provided on the upper plate 17C of the arm body 17. The intermediate guide sheave 38 is interposed between the opening / closing guide sheave 32 provided on the left side plate 17A of the arm body 17 and the slack adjustment sheave 37 provided on the right side plate 17B of the arm body 17, and the opening / closing rope 41 extending from the slack adjustment sheave 37 is wound around the intermediate guide sheave 38 to guide the opening / closing rope 41 to the opening / closing guide sheave 32.

[0039] The lifting rope 39 is provided between the arm 16 and the clamshell bucket 43, and supports the clamshell bucket 43 so that it can be raised and lowered. The lifting rope 39 is made of a wire rope, and one end 39A of the lifting rope 39 is attached to a left stay 40 that protrudes from the left side plate 17A of the arm body 17. The other end 39B of the lifting rope 39 extends downward from the front end edge of the lifting guide sheave 31, and is attached to a bucket support part 43A of the clamshell bucket 43 (see FIG. 1). The middle part of the lifting rope 39 is wound alternately around the multiple first lifting sheaves 23 and the multiple second lifting sheaves 25. Here, as shown in FIG. 5, if the length dimension of the clamshell bucket 43 in the opening and closing direction (front-to-back direction) is A and the width dimension in the direction perpendicular to the opening and closing direction (left-to-right direction) is B, the other end 39B of the lifting rope 39 is attached to the bucket support part 43A at a position that is the center of the clamshell bucket 43 in the front-to-back direction (length dimension A) and the center in the left-to-right direction (width dimension B).

[0040] The opening and closing rope 41 is provided between the arm 16 and the clamshell bucket 43, and opens and closes a pair of buckets 43B of the clamshell bucket 43. The opening and closing rope 41 is made of a wire rope, and one end 41A of the opening and closing rope 41 is attached to a right stay 42 protruding from the right side plate 17B of the arm body 17. The other end 41B of the opening and closing rope 41 is attached to a bucket support part 43A of the clamshell bucket 43 (see FIG. 1). The middle part of the opening and closing rope 41 is alternately wound around the first opening and closing sheaves 24 and the second opening and closing sheaves 29, and is also wound around the slack adjustment sheave 37 and the middle guide sheave 38. The other end 41B side of the opening and closing rope 41 is alternately wound around the upper sheaves 43E and the lower sheaves 43F that constitute the clamshell bucket 43.

[0041] The clamshell bucket 43 as an excavation bucket is suspended from the front end of the arm 16 by the lifting rope 39 so as to be liftable and lowerable. The clamshell bucket 43 has a bucket support part 43A, a pair of buckets 43B provided on the lower side of the bucket support part 43A so as to be openable and closable, a connecting bracket 43C to which the pair of buckets 43B are rotatably connected, and a pair of opening and closing arms 43D connecting between the bucket support part 43A and the pair of buckets 43B. The bucket support part 43A is provided with a plurality of upper sheaves 43E, and the connecting bracket 43C is provided with a plurality of lower sheaves 43F that face the upper sheaves 43E in the up-down direction.

[0042] The other end 38B of the lifting rope 39 is attached to the bucket support portion 43A of the clamshell bucket 43. In addition, the opening and closing rope 41 is alternately wound around the upper sheave 43E and the lower sheave 43F of the clamshell bucket 43, and the other end 41B of the opening and closing rope 41 is attached to the bucket support portion 43A of the clamshell bucket 43. Therefore, by changing the length of the lifting rope 39 extending from the lifting and lowering guide sheave 31 provided at the tip of the arm 16 to the clamshell bucket 43, the clamshell bucket 43 can be lifted and lowered. In addition, by changing the length of the opening and closing rope 41 extending from the opening and closing guide sheave 32 provided at the tip of the arm 16 to the clamshell bucket 43, the clamshell bucket 43 can be opened and closed.

[0043] Next, the common base frame 44, the arm receiving member 45, and the tag line winch 47 used in this embodiment will be described.

[0044] The common base frame 44 is detachably provided on the back surface 12C of the first boom 12. As shown in Figures 6 and 7, an arm receiving member 45 and a tag line winch 47 are integrally attached to the common base frame 44.

[0045] The common base frame 44 is formed by a frame surrounded by a left side plate 44A, a right side plate 44B, a front plate 44C, a rear plate 44D, and an upper plate 44E. On the lower side of the common base frame 44, a left overhang plate 44F facing the left side plate 44A across the cylinder bracket 12E of the first boom 12, and a right overhang plate 44G facing the right side plate 44B across the cylinder bracket 12E of the first boom 12 are provided. The left side plate 44A and the left overhang plate 44F are detachably attached to the cylinder bracket 12E of the first boom 12 using two support pins 44H. The right side plate 44B and the right overhang plate 44G are detachably attached to the cylinder bracket 12E of the first boom 12 using two support pins 44J.

[0046] A winch support base 44K is fixed to the front side of the left side plate 44A and the front plate 44C by means of welding or the like. The winch support base 44K protrudes forward from the left side plate 44A and the front plate 44C and supports a tag line winch 47. The upper plate 44E of the common base frame 44 is made of a rectangular flat plate extending in the left-right direction, and has an arm receiving member 45 attached thereto. Four screw seats 44L, each with a bolt hole (female threaded hole) penetrating in the up-down direction, are provided on both left-right ends of the upper plate 44E.

[0047] The arm receiving member 45 is provided on the back surface 12C of the first boom 12 via the common base frame 44. The arm receiving member 45 is attached to an upper plate 44E of the common base frame 44, and holds the arm 16 from below when the working device 11 is in the transport posture shown in FIG. 2. The arm receiving member 45 includes a flat bottom plate 45A having the same shape as the upper plate 44E of the common base frame 44, and a left standing plate 45B and a right standing plate 45C which are erected on the bottom plate 45A while facing each other in the left-right direction and extend in the front-rear direction. The bottom plate 45A has four long slots 46A (described later) at positions corresponding to the screw seats 44L provided on the common base frame 44, and the arm receiving member 45 is attached to the common base frame 44 by screwing bolts 45D inserted into the long slots 46A into the screw seats 44L.

[0048] The left and right standing plates 45B and 45C of the arm receiving member 45 face each other in parallel with a gap slightly larger than the width dimension of the arm body 17 in the left-right direction. As a result, an arm storage space 45E for storing the arm body 17 when the working device 11 is in the transport posture is formed between the left and right standing plates 45B and 45C. The upper end sides of the left and right standing plates 45B and 45C are bent portions 45F that are inclined so that the gap in the left-right direction gradually increases, and the arm body 17 is guided to the arm storage space 45E by these left and right bent portions 45F. As shown in FIG. 8 and FIG. 9, a total of four bolt holes (female screw holes) 45G are formed in a position of the bottom plate 45A close to the left standing plate 45B, two each, spaced apart in the front-rear direction, and a total of four bolt holes (not shown) are also formed in a position of the bottom plate 45A close to the right standing plate 45C.

[0049] A position adjustment mechanism 46 is provided on the bottom plate 45A of the arm receiving member 45 to adjust the position of the arm receiving member 45 in the horizontal and vertical directions relative to the common base frame 44. The position adjustment mechanism 46 is composed of four long slots 46A and four height adjustment members 46B.

[0050] The four long slots 46A are provided in the bottom plate 45A at locations corresponding to the screw seats 44L of the common base frame 44. The long slots 46A have an oval shape extending in the left-right direction, and the bolts 45D are inserted therethrough so as to be relatively movable. This allows the position of the arm receiving member 45 to be adjusted in the left-right direction (horizontal direction) within the range of the long slots 46A relative to the common base frame 44 when the arm receiving member 45 is fastened to the common base frame 44 using the bolts 45D.

[0051] The four height adjustment members 46B are provided on the bottom plate 45A of the arm receiving member 45 on the side of the arm accommodation space 45E. As shown in FIG. 9 and FIG. 10, the height adjustment members 46B are arranged at a total of four locations: two locations adjacent to the left standing plate 45B corresponding to the bolt holes 45G, and two locations adjacent to the right standing plate 45C corresponding to the bolt holes 45G. The height adjustment members 46B are composed of an abutment plate 46C that abuts against the lower plate 17D of the arm body 17, two bolts 46D that are inserted through the abutment plate 46C and screwed into the bolt holes 45G, and a plurality of shims 46E that are arranged between the abutment plate 46C and the bottom plate 45A. The shims 46E adjust the amount of protrusion (height) of the abutment plate 46C from the bottom plate 45A by combining a plurality of types of shim plates with different plate thicknesses. Two bolt insertion holes 46F corresponding to the bolt holes 45G are formed in each of the plurality of shims 46E. The contact plate 46C is formed with two bolt insertion holes 46G corresponding to the bolt holes 45G, and a countersunk hole 46H for receiving the head of a bolt 46D.

[0052] Therefore, by appropriately combining the shims 46E of the height adjustment members 46B and adjusting the amount of protrusion of the contact plates 46C from the bottom plate 45A, the four contact plates 46C can be reliably brought into contact with the lower plate 17D of the arm body 17. This allows the arm body 17 of the arm 16 to be stably held by the arm receiving member 45 when the working device 11 is in the transport posture. As shown in Fig. 10, the upper plate 44E of the common base frame 44 has long slots 44M through which the tips of the bolts 45D are inserted at four locations corresponding to the height adjustment members 46B, and these long slots 44M have a length dimension equivalent to that of the long slots 46A of the position adjustment mechanism 46.

[0053] 2, the arm receiving member 45 is disposed in front of the driver's seat 5A in the cab 5 when the working device 11 is in the transport posture. This allows the operator sitting in the driver's seat 5A to simultaneously view the arm body 17 and the arm receiving member 45 while facing forward and in a comfortable posture when the arm 16 is pulled toward the back surface 12C of the first boom 12 and the arm body 17 is held by the arm receiving member 45. Note that the arm receiving member 45 may be disposed in a position facing the driver's seat 5A on the right side (directly beside the driver's seat 5A) when the working device 11 is in the transport posture.

[0054] The tag line winch 47 is provided on the back surface 12C of the first boom 12 together with the arm receiving member 45 via the common base frame 44. As shown in Fig. 4, the tag line winch 47 is attached to a winch support base 44K of the common base frame 44 at a position shifted toward the cab 5 side from the arm receiving member 45, i.e., at the left front side of the arm receiving member 45. As shown in Fig. 6 and Fig. 7, the tag line winch 47 is composed of a support frame 48, a drum 49 rotatably supported by the support frame 48, and a hydraulic motor 50 that rotates and drives the drum 49, and winds up and unwinds a vibration prevention rope 51 (described later) connected to the clamshell bucket 43.

[0055] The support frame 48 is attached to the winch support base 44K of the common base frame 44. The support frame 48 is composed of a bottom plate 48A, a left plate 48B and a right plate 48C that are erected on the bottom plate 48A and face each other at a fixed interval in the left-right direction, and a connecting plate 48D that connects the left plate 48B and the right plate 48C. The bottom plate 48A of the support frame 48 is fixed onto the winch support base 44K using a plurality of bolts 48E.

[0056] The drum 49 has a cylindrical drum body 49A and a rotating shaft 49B provided at the center of the drum body 49A. The rotating shaft 49B is rotatably supported by a left side plate 48B and a right side plate 48C of the support frame 48, and an anti-vibration rope 51 is wound around the drum body 49A. The hydraulic motor 50 is attached to the right side plate 48C of the support frame 48. The hydraulic motor 50 is connected to the rotating shaft 49B of the drum 49 via a reducer or the like, and drives the drum body 49A to rotate.

[0057] The anti-vibration rope 51 is made of a wire rope and is provided between the clamshell bucket 43 and the drum 49 of the tagline winch 47. As shown in Fig. 5, one end of the anti-vibration rope 51 is bifurcated and connected to the opening / closing arm 43D of the clamshell bucket 43 in a direction (left-right direction) perpendicular to the opening / closing direction of the clamshell bucket 43. As a result, the anti-vibration rope 51 is connected to the clamshell bucket 43 at the center in the left-right direction and the front-rear direction of the clamshell bucket 43 shown in Fig. 5, and is guided to the tagline winch 47 via the anti-vibration sheave 52 and the second anti-vibration sheave 54 described later, and is wound around the drum body 49A of the drum 49.

[0058] When the clamshell bucket 43 is used to excavate the shaft 100, the tagline winch 47 appropriately winds and unwinds the anti-sway rope 51 using the drum 49. This adjusts the tension of the anti-sway rope 51, preventing the clamshell bucket 43 from swinging horizontally (forward / backward and left / right) (anti-sway) and preventing it from rotating around the lifting rope 39 (anti-rotation).

[0059] 1, the tag line winch 47 is disposed in front of the driver's seat 5A in the cab 5 when the working implement 11 is in the working posture. As a result, when the tag line winch 47 is used to wind and unwind the anti-sway rope 51 during excavation work of the shaft 100, the operator sitting in the driver's seat 5A can reliably visually check the anti-sway rope 51 wound around the tag line winch 47 and the clamshell bucket 43 while remaining in a comfortable posture facing forward. The tag line winch 47 may be disposed in a position facing the driver's seat 5A on the right side (directly to the side of the driver's seat 5A) when the working implement 11 is in the working posture.

[0060] Here, a lift guide sheave 31 and an opening / closing guide sheave 32 are rotatably provided on the front end side of the left side plate 17A of the arm body 17, and a lift rope 39 supporting the clamshell bucket 43 is wound around the lift guide sheave 31. Therefore, the center of the clamshell bucket 43 in the left-right direction is biased toward the left side plate 17A located on the cab 5 side of the arm body 17, and an anti-sway rope 51 connected to the clamshell bucket 43 is disposed closer to the cab 5. In contrast, the tag line winch 47 is provided at a position biased toward the cab 5 side relative to the arm receiving member 45, so that the anti-sway rope 51 can be smoothly wound and unwound by the drum 49 without interfering with the first boom 12, the second boom 13, etc.

[0061] Furthermore, the tag line winch 47 is provided on the common base frame 44 together with the arm receiving member 45, and the common base frame 44 is detachably attached to the cylinder bracket 12E of the first boom 12. This allows the arm receiving member 45 and the tag line winch 47 to be gathered together in one place by the common base frame 44. As a result, the space occupied by the arm receiving member 45 and the tag line winch 47 can be made smaller than when, for example, the tag line winch and the arm receiving member are provided separately. As a result, for example, the degree of freedom can be increased when arranging hydraulic lines 53, etc., described later, in the working device 11.

[0062] The anti-vibration sheave 52 is rotatably provided on the tip side (arm bracket 13F) of the second boom 13 adjacent to the connecting portion (connecting pin 17J) with the arm 16. As shown in Fig. 11 and Fig. 12, the anti-vibration sheave 52 has a support shaft 52A protruding from the left side surface of the arm bracket 13F located on the cab 5 side, and a sheave body 52C rotatably supported on the support shaft 52A via a bearing 52B. In addition, two circular flanges 52D having a larger diameter than the sheave body 52C are fixed to the support shaft 52A with the sheave body 52C sandwiched therebetween, and one anti-detachment pin 52E is fixed to the two circular flanges 52D located on the outer diameter side of the sheave body 52C.

[0063] An intermediate portion of the anti-vibration rope 51 engages with the sheave body 52C of the anti-vibration sheave 52, and guides the anti-vibration rope 51 extending from the clamshell bucket 43 toward the drum 49 of the tagline winch 47. In addition, the anti-detachment pin 52E of the anti-vibration sheave 52 engages with the anti-vibration rope 51 that has detached from the sheave body 52C, thereby preventing the anti-vibration rope 51 from coming off the anti-vibration sheave 52, for example, when the working device 11 is in a transport posture.

[0064] In this way, by providing the anti-sway sheave 52 on the arm bracket 13F of the second boom 13, it is possible to ensure a large distance between the anti-sway sheave 52 and the tag line winch 47. This makes it possible to set the fleet angle of the anti-sway rope 51 that is wound around the drum 49 of the tag line winch 47 via the anti-sway sheave 52 within an appropriate range, and makes it possible to prevent the anti-sway rope 51 from being wound around the drum 49 in an irregular manner.

[0065] 14 and 15, a plurality of hydraulic lines 53 including hydraulic hoses are attached to the left side surface 13A of the second boom 13, which faces the cab 5. These hydraulic lines 53 supply pressure oil to hydraulic actuators such as the lifting cylinder 22 and the opening / closing cylinder 28 provided on the arm 16, and extend from the left side of the arm bracket 13F provided on the second boom 13 to the arm body 17. In contrast, the anti-sway sheave 52 is disposed closer to the left side surface 13A of the second boom 13 than the plurality of hydraulic lines 53 disposed on the left side of the arm bracket 13F. This makes it possible to prevent the anti-sway rope 51 from interfering with the plurality of hydraulic lines 53, and to protect the hydraulic lines 53.

[0066] The second anti-vibration sheave 54 is located between the clamshell bucket 43 and the anti-vibration sheave 52 and is rotatably provided on the arm body 17. As shown in Figs. 11 and 13, a bracket 55 protruding leftward from the left side plate 17A is provided near the corner where the left side plate 17A and the bottom plate 17D of the arm body 17 intersect, and a U-shaped shackle 56 is attached to the bracket 55. The second anti-vibration sheave 54 is attached to the shackle 56, and is disposed below the bottom plate 17D, which is the abdominal surface of the arm body 17, and is swingable in the horizontal direction including the front-rear direction and the left-right direction. The second anti-vibration sheave 54 is composed of a hook 54A that engages with the shackle 56, two side covers 54B that face each other in the left-right direction with the hook 54A in between, and a sheave body 54D that is rotatably supported between the two side covers 54B via a support shaft 54C.

[0067] The sheave body 54D of the second anti-vibration sheave 54 engages with an intermediate portion of the anti-vibration rope 51 extending from the clamshell bucket 43 to the anti-vibration sheave 52, thereby guiding the anti-vibration rope 51 to the anti-vibration sheave 52 while alleviating the force acting on the anti-vibration rope 51 due to the swinging of the clamshell bucket 43. The second anti-vibration sheave 54 engages with the shackle 56 so as to be swingable in the horizontal direction, and is disposed below the lower surface plate 17D of the arm body 17. Therefore, even if the clamshell bucket 43 swings in the horizontal direction during excavation work, the second anti-vibration sheave 54 swings with respect to the shackle 56 following the swinging motion of the clamshell bucket 43, while guiding the anti-vibration rope 51 to the anti-vibration sheave 52 by the sheave body 54D.

[0068] 5, the lift guide sheave 31 provided at the front end of the left side plate 17A of the arm body 17, the sheave body 52C of the anti-vibration sheave 52, and the sheave body 54D of the second anti-vibration sheave 54 are arranged in a straight line. The other end 39B of the lift rope 39 is connected to the bucket support part 43A at the center of the clamshell bucket 43 in the left-right direction and the front-back direction, and the anti-vibration rope 51 is connected to the clamshell bucket 43 at the center of the clamshell bucket 43 in the left-right direction. Therefore, the anti-vibration rope 51 is guided to the drum 49 of the tagline winch 47 via the sheave body 52C of the anti-vibration sheave 52 and the sheave body 54D of the second anti-vibration sheave 54, which are arranged in a straight line. As a result, the anti-vibration rope 51 can be prevented from coming off the anti-vibration sheave 52 (sheave body 52C) and the second anti-vibration sheave 54 (sheave body 54D), and the anti-vibration rope 51 can be smoothly wound and unwound by the tag line winch 47.

[0069] Also, the mounting position of the second anti-sway sheave 54 with respect to the arm body 17, that is, the mounting position of the shackle 56, is set as follows. That is, as shown in FIG. 1, the horizontal distance between the hoisting rope 39 extending downward from the front end (hoisting guide sheave 31) of the arm body 17 and the shackle 56 is denoted as C, and the diameter of the pile 100 is denoted as D. In this state, the mounting position of the shackle 56 is set at a position where the distance C is smaller than the radius D / 2 of the pile 100 (C < D / 2). Thereby, when excavating the pile 100, it is possible to prevent the anti-sway rope 51 from contacting the opening edge 100A of the pile 100, and the anti-sway rope 51 can be protected.

[0070] The deep foundation excavator 1 according to the present embodiment has the configuration as described above. When excavating the pile 100 using the deep foundation excavator 1, the operator boards the cab 5 and operates a travel lever and pedal device (not shown) to drive the deep foundation excavator 1 to the work location. Next, the operator operates an operation lever device (not shown) to extend and retract the boom cylinder 14, the positioning cylinder 15, and the arm cylinder 18. As a result, as shown in FIG. 1, the working device 11 assumes a working posture in which the tip of the first boom 12 is extended to the upper limit position and the arm 16 is disposed above the second boom 13. In this state, by adjusting the amount of extension and retraction of the positioning cylinder 15, the arm cylinder 18, etc., the angle of the arm 16 with respect to the ground can be appropriately set. Therefore, for example, when performing excavation work inside a building where the working height is restricted, the working posture can be changed so that the arm 16 is horizontal with the ground, and the working height of the deep foundation excavator 1 can be kept low.

[0071] After determining the working posture of the working device 11 according to the work site, the operator uses the operating lever device to rotate the upper rotating body 3 and move the clamshell bucket 43 to above the shaft 100 to be excavated. Next, the operator uses the bucket lifting / opening device 21 to lower the clamshell bucket 43 into the shaft 100, and after landing the clamshell bucket 43 on the bottom of the hole with the bucket 43B open, closes the bucket 43B. In this way, after the soil at the bottom of the hole is excavated and held in the clamshell bucket 43, the clamshell bucket 43 is lifted up to above the shaft 100 by the bucket lifting / opening device 21. Then, the upper rotating body 3 is rotated to move the clamshell bucket 43 to a predetermined soil discharge position, and the bucket 43B is opened to discharge the soil.

[0072] In this way, when the shaft 100 is excavated using the clamshell bucket 43, the anti-sway rope 51 is appropriately wound and unwound by the drum 49 by operating the tag line winch 47 provided on the back surface 12C of the first boom 12 via the common base frame 44. This adjusts the tension of the anti-sway rope 51, suppressing the clamshell bucket 43 from swinging in the horizontal direction (front-back and left-right directions) and from rotating around the lift rope 39. In this case, the tag line winch 47 is located forward of the driver's seat 5A in the cab 5 and provided on the back surface 12C of the first boom 12. This allows the operator sitting in the driver's seat 5A to simultaneously view the anti-sway rope 51 wound around the tag line winch 47 and the clamshell bucket 43 while remaining in a comfortable position facing forward when winding and unwinding the anti-sway rope 51 with the tag line winch 47. As a result, the operator can accurately operate the tag line winch 47 in accordance with the behavior of the clamshell bucket 43, thereby improving workability when excavating the shaft 100.

[0073] Furthermore, an anti-sway sheave 52 is provided adjacent to the connecting pin 17J with the arm 16 on the tip side (arm bracket 13F) of the second boom 13, and the anti-sway rope 51 is guided to the tag line winch 47 via the anti-sway sheave 52. Therefore, even if the arm 16 rotates relative to the second boom 13 during excavation work, the tag line winch 47 can smoothly wind and unwind the anti-sway rope 51. As a result, the working posture of the working device 11 can be freely selected, improving the workability of excavation work.

[0074] Moreover, by providing the anti-sway sheave 52 on the arm bracket 13F of the second boom 13, a large distance can be secured between the anti-sway sheave 52 and the tag line winch 47. This allows the fleet angle of the anti-sway rope 51 wound around the drum 49 of the tag line winch 47 via the anti-sway sheave 52 to be set within an appropriate range, and prevents the anti-sway rope 51 from being wound around the drum 49. As a result, the workability when winding and unwinding the anti-sway rope 51 by the tag line winch 47 can be improved, and the life of the anti-sway rope 51 can be extended.

[0075] As shown in FIG. 15, the anti-vibration sheave 52 is disposed closer to the left side surface 13A of the second boom 13 than the multiple hydraulic lines 53 disposed on the left side of the arm bracket 13F. This prevents the anti-vibration rope 51 from interfering with the multiple hydraulic lines 53, and protects the hydraulic lines 53. In this case, by disposing the anti-vibration sheave 52 closer to the left side surface 13A of the second boom 13, the length of the support shaft 52A supporting the sheave body 52C can be made as small as possible, and the sheave body 52C can be supported in a cantilever manner. Therefore, the entire anti-vibration sheave 52 can be configured compactly, and since the anti-vibration rope 51 can be brought closer to the left side surface 13A of the second boom 13, it is not necessary to dispose the hydraulic lines 53 far to the left from the left side surface 13A of the second boom 13. As a result, the operator's line of sight when viewing the clamshell bucket 43 and the like from the driver's seat 5A is not obstructed by the hydraulic lines 53, and the operator's field of vision can be secured.

[0076] The arm body 17 is also provided with a second anti-vibration sheave 54 with which the anti-vibration rope 51 engages between the clamshell bucket 43 and the anti-vibration sheave 52. The second anti-vibration sheave 54 guides the anti-vibration rope 51 to the anti-vibration sheave 52 in a state in which the force acting on the anti-vibration rope 51 due to the swinging of the clamshell bucket 43 is alleviated. In this case, the second anti-vibration sheave 54 is attached to the arm body 17 via a shackle 56, and is disposed below the lower plate 17D of the arm body 17. This allows the second anti-vibration sheave 54 to swing in the horizontal direction, including the front-rear direction and the left-right direction. As a result, even if the clamshell bucket 43 swings in the horizontal direction during excavation work, the second anti-vibration sheave 54 can accurately guide the anti-vibration rope 51 to the anti-vibration sheave 52 while swinging relative to the shackle 56 in accordance with the swinging motion of the clamshell bucket 43.

[0077] 1, the horizontal distance C between the lifting rope 39 extending downward from the front end (lifting guide sheave 31) of the arm body 17 and the shackle 56 is set to be smaller than the radius D / 2 of the shaft 100 having a diameter D. This makes it possible to prevent the vibration-stopping rope 51 from contacting the open end edge 100A of the shaft 100 during excavation work of the shaft 100, thereby protecting the vibration-stopping rope 51.

[0078] Furthermore, the lift guide sheave 31 provided at the front end of the arm body 17, the anti-vibration sheave 52 (sheave body 52C), and the second anti-vibration sheave 54 (sheave body 54D) are arranged in a straight line. This allows the anti-vibration rope 51 to be guided to the drum 49 of the tag line winch 47 via the sheave body 52C of the anti-vibration sheave 52 and the sheave body 54D of the second anti-vibration sheave 54, which are arranged in a straight line. As a result, the anti-vibration rope 51 can be prevented from coming off the anti-vibration sheave 52 (sheave body 52C) and the second anti-vibration sheave 54 (sheave body 54D), and the anti-vibration rope 51 can be smoothly wound and unwound by the tag line winch 47.

[0079] Next, when the deep foundation excavator 1 is transported to another work site, as shown in FIG. 2, the deep foundation excavator 1 is loaded onto the loading platform 101A of the trailer 101 with the working device 11 moved to the transport posture. That is, with the clamshell bucket 43 raised to the front end 17E side of the arm body 17, the boom cylinder 14 and the positioning cylinder 15 are contracted and the arm cylinder 18 is extended. As a result, the working device 11 is in a compact transport posture with the arm 16 disposed above the first boom 12 and the second boom 13, and the arm body 17 is accommodated in the arm accommodation space 45E of the arm receiving member 45 and held by the arm receiving member 45. As a result, the transport height (total height during transport) of the deep foundation excavator 1 can be kept within the limits imposed by the Road Traffic Act and the like, and the workability of the transport work can be improved.

[0080] Here, the arm receiving member 45 is disposed forward of the driver's seat 5A in the cab 5 when the working apparatus 11 is in the transport posture. Therefore, when the arm 16 is pulled toward the back surface 12C of the first boom 12 and the arm body 17 is held by the arm receiving member 45, the operator sitting in the driver's seat 5A can simultaneously view the arm body 17 and the arm receiving member 45 while remaining in a comfortable posture facing forward. As a result, the operator can quickly and accurately perform the operation of storing the arm body 17 in the arm receiving member 45 (arm storing space 45E), thereby improving the operability when the working apparatus 11 is shifted to the transport posture.

[0081] Moreover, the arm receiving member 45 that holds the arm body 17 is provided with a position adjustment mechanism 46 consisting of a long slot 46A and a height adjustment member 46B. The long slot 46A is formed in the bottom plate 45A of the arm receiving member 45, and a bolt 45D that fastens the arm receiving member 45 to the common base frame 44 is inserted through the long slot 46A. Therefore, by adjusting the position of the arm receiving member 45 in the left-right direction (horizontal direction) within the range of the long slot 46A relative to the common base frame 44, the arm body 17 can be reliably accommodated in the arm accommodation space 45E of the arm receiving member 45. Moreover, the upper end sides of the left standing plate 45B and the right standing plate 45C of the arm receiving member 45 are bent portions 45F that are inclined so that the interval in the left-right direction gradually increases. Therefore, the left and right bent portions 45F can smoothly guide the arm body 17 into the arm accommodation space 45E.

[0082] On the other hand, the bottom plate 45A of the arm receiving member 45 is provided with four height adjustment members 46B spaced apart from each other in the front-rear and left-right directions. A plurality of shims 46E made of shim plates with different plate thicknesses are provided between the bottom plate 45A of the arm receiving member 45 and the abutment plate 46C. Therefore, by appropriately combining the plurality of shims 46E and adjusting the protruding amount of the abutment plate 46C from the bottom plate 45A, the four abutment plates 46C can be reliably abutted against the lower plate 17D of the arm body 17. As a result, even if there is an assembly tolerance of the arm body 17 or a dimensional tolerance of the connecting portion (connecting pin 17J) between the arm body 17 and the second boom 13 (arm bracket 13F), the lower plate 17D of the arm body 17 can be reliably abutted against the four abutment plates 46C. As a result, when the working device 11 is in the transportation posture, the arm body 17 of the arm 16 can be stably held by the arm receiving member 45.

[0083] Moreover, the arm receiving member 45 and the tag line winch 47 are mounted integrally on the back surface 12C of the first boom 12 while being attached to the common base frame 44. Therefore, the space occupied by the arm receiving member 45 and the tag line winch 47 can be made as small as possible, allowing for greater freedom when routing hydraulic lines 53 and the like in the deep foundation excavator 1, for example.

[0084] Thus, the deep foundation excavator 1 according to this embodiment is composed of a self-propelled lower traveling body 2 and an upper rotating body 3 provided with a cab 5 having a driver's seat 5A, and a working device 11 provided on the upper rotating body 3, and the working device 11 is provided with a first boom 12 whose base end is rotatably attached to the upper rotating body 3, a second boom 13 rotatably attached to the tip of the first boom 12, an arm 16 rotatably attached to the tip of the second boom 13, a clamshell bucket 43 supported by a lifting rope 39 unwound from the arm 16, and a tag line winch 47 that winds and unwinds a vibration prevention rope 51 connected to the clamshell bucket 43. The tag line winch 47 is provided on the back surface 12C of the first boom 12, and the tag line winch 47 is disposed in a position facing the driver's seat 5A laterally or forward of the driver's seat 5A.

[0085] With this configuration, the operator sitting in the driver's seat 5A can simultaneously visually check the anti-sway rope 51 wound around the tag line winch 47 and the clamshell bucket 43 while remaining in a comfortable forward-facing position when winding and unwinding the anti-sway rope 51 with the tag line winch 47 during excavation work of the shaft 100. As a result, the operator can accurately operate the tag line winch 47 in accordance with the behavior of the clamshell bucket 43, improving the workability of the excavation work.

[0086] In the embodiment, an arm receiving member 45 that holds the arm 16 when the working device 11 is in the transport posture is provided on the back surface 12C of the first boom 12, and the arm receiving member 45 is disposed in a position facing the driver's seat 5A laterally when the working device 11 is in the transport posture or in front of the driver's seat 5A. With this configuration, when the arm body 17 is held by the arm receiving member 45 to move the working device 11 to the transport posture, the operator sitting in the driver's seat 5A can simultaneously view the arm body 17 and the arm receiving member 45 while remaining in a comfortable posture facing forward. As a result, the operator can quickly and accurately perform the operation of storing the arm body 17 in the arm receiving member 45, thereby improving the workability.

[0087] In this embodiment, the tag line winch 47 is disposed at a position shifted toward the cab 5 side from the arm receiving member 45. According to this configuration, the anti-sway rope 51 can be smoothly wound up and unwound by the drum 49 without interfering with the first boom 12, the second boom 13, etc.

[0088] In the embodiment, a hydraulic line 53 that supplies pressure oil to a hydraulic actuator provided on the arm 16 is provided on the left side surface 13A of the second boom 13 facing the cab 5, and an anti-sway sheave 52 with which an anti-sway rope 51 engages is rotatably provided on the tip side of the second boom 13, and the anti-sway sheave 52 is disposed closer to the left side surface 13A of the second boom 13 than the hydraulic line 53. With this configuration, it is possible to prevent the anti-sway rope 51 from interfering with the hydraulic line 53, and it is possible to protect the hydraulic line 53.

[0089] In the embodiment, the arm body 17 is provided with a second anti-vibration sheave 54 with which the anti-vibration rope 51 engages between the anti-vibration sheave 52 and the clamshell bucket 43. With this configuration, the anti-vibration rope 51 can be guided to the anti-vibration sheave 52 in a state in which the force acting on the anti-vibration rope 51 due to the swinging of the clamshell bucket 43 is alleviated by the second anti-vibration sheave 54. As a result, the anti-vibration rope 51 can be smoothly wound and unwound on the tagline winch 47.

[0090] In the embodiment, the second anti-vibration sheave 54 is disposed below the lower plate 17D of the arm body 17, and is supported so as to be rotatable in the horizontal direction relative to the arm body 17. According to this configuration, even if the clamshell bucket 43 swings in the horizontal direction including the front-rear and left-right directions during excavation work, the second anti-vibration sheave 54 can swing following the swinging motion of the clamshell bucket 43, and can accurately guide the anti-vibration rope 51 to the anti-vibration sheave 52.

[0091] In the embodiment, the lift guide sheave 31 with which the lift rope 39 engages is rotatably provided on the left side plate 17A of the arm body 17 that faces the cab 5, and the lift guide sheave 31, the anti-vibration sheave 52 (sheave body 52C), and the second anti-vibration sheave 54 (sheave body 54D) are arranged in a straight line. With this configuration, the anti-vibration rope 51 can be prevented from coming off the anti-vibration sheave 52 (sheave body 52C) and the second anti-vibration sheave 54 (sheave body 54D), and the anti-vibration rope 51 can be smoothly wound and unwound by the tag line winch 47.

[0092] In the embodiment, the arm receiving member 45 and the tag line winch 47 are each attached to a common base frame 44, and the common base frame 44 is detachably attached to the first boom 12. With this configuration, the space occupied by the arm receiving member 45 and the tag line winch 47 can be made as small as possible, and the degree of freedom can be increased when routing hydraulic lines 53, etc., in the deep foundation excavator 1, for example. Moreover, by simply attaching the common base frame 44 to the first boom 12 of the upper rotating body 3, which is a general-purpose main body, the arm receiving member 45 and the tag line winch 47 can be mounted without making major modifications to the upper rotating body 3.

[0093] In the embodiment, the arm support member 45 is provided with a position adjustment mechanism 46 for adjusting the position of the arm support member 45 in the horizontal and vertical directions relative to the common base frame 44. According to this configuration, the arm body 17 can be securely held by the arm support member 45 even if there is, for example, an assembly tolerance of the arm body 17 or a dimensional tolerance of the connection portion between the arm body 17 and the second boom 13.

[0094] In the embodiment, the description is given taking as an example a deep foundation excavator 1 in which the components of the bucket lifting and opening / closing device 21, excluding the lifting cylinder 22, are disposed outside the arm 16 (arm body 17). However, the present invention is not limited to this, and can be applied to, for example, a deep foundation excavator in which a bucket lifting and opening / closing device is provided inside the arm. [Explanation of symbols]

[0095] 1 Deep foundation excavator 2 Undercarriage (car body) 3 Upper rotating body (car body) 5 Cab 5A Driver's seat 11 Working equipment 12 First Boom 12C back 13 Second Boom 13A Left side (one side) 16 Arm 17 Arm body 17D Lower plate (ventral surface) 39 Ascending and descending rope 43 Clamshell bucket (digging bucket) 44 Common Base Frame 45 Arm support member 46 Position adjustment mechanism 47 Tagline winch 51 Vibration prevention rope 52 Anti-vibration sheave 53 Hydraulic Pipeline 54 Second anti-vibration sheave

Claims

1. A self-propelled vehicle body provided with a cab having a driver's seat, and a working device provided on the vehicle body, In the deep foundation excavator comprising a first boom having a proximal end rotatably attached to the vehicle body, a second boom rotatably attached to the tip of the first boom, an arm rotatably attached to the tip of the second boom, a bucket supported by a hoist rope fed out from the arm, and a tagline winch for winding and unwinding a damping rope connected to the bucket, The deep foundation excavator is characterized in that the tagline winch is provided at a position facing the driver's seat laterally or on the back surface of the first boom in front of the driver's seat.

2. The deep foundation excavator according to claim 1, further comprising an arm receiving member that is separated from the arm in a state where the working device is in a non-transport posture and supports the arm in a state where the working device is in a transport posture.

3. The arm receiving member is provided on the back surface of the first boom and is disposed at a position facing the driver's seat laterally or in front of the driver's seat in a state where the working device is in a transport posture, The deep foundation excavator according to claim 2, wherein the tagline winch is disposed at a position offset toward the cab side from the arm receiving member.

4. Further comprising a damping sheave around which the damping rope is engaged and rotatable between the tagline winch and the bucket, On one side surface of the second boom on the cab side, a hydraulic pipeline for supplying pressure oil to a hydraulic actuator provided on the arm is provided, The deep foundation excavator according to claim 1, wherein the damping sheave is disposed closer to the inner side of the vehicle body in the left-right direction of the vehicle body than the hydraulic pipeline.

5. Further comprising a damping sheave around which the damping rope is engaged and rotatable between the tagline winch and the bucket, The deep foundation excavator according to claim 1, wherein a second damping sheave around which the damping rope is engaged and rotatable is provided on the arm between the damping sheave and the bucket.

6. The deep foundation excavator according to claim 5, wherein the second damping sheave is disposed below the ventral surface of the arm and is rotatably supported in the left-right direction of the vehicle body.

7. At the front end of the arm, a lifting guide sheave with which the lifting rope engages is rotatably provided. The deep foundation excavator according to claim 5, wherein the lifting guide sheave, the anti-sway sheave, and the second anti-sway sheave are arranged in a straight line. **Claim 8** The arm receiving member and the tagline winch are each attached to a common base frame. The deep foundation excavator according to claim 2, wherein the common base frame is detachably attached to the first boom. **Claim 9** The deep foundation excavator according to claim 2, wherein the arm receiving member is provided with a position adjustment mechanism for adjusting the position of the arm receiving member in the horizontal and vertical directions.

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