JP2019049113A - Pile driver - Google Patents

Abstract

To provide a pile driver equipped with an outrigger box connecting arm which can favorably ease the load acting on a main frame while having a simple structure.SOLUTION: An outrigger box connecting arm 42 for attaching an outrigger box 20 is fixed to a rear end of a main frame 41. The outrigger box connecting arm is provided with: an U-shaped engaging groove 42a opened forward; a first pin insertion hole 42e through which a first connection pin 43 for attaching the outrigger box at a rear position with respect to a rear plate 41a of the main frame is inserted with the rear end of the main frame inserted into the engaging groove; and a second pin insertion hole 42f through which a second connection pin 44 for attaching a rear leg 22b of a gantry 22 at an upper position with respect to a top plate 41b of the main frame is inserted.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a pile driver, and more particularly, to a pile driver provided with an outrigger box connecting arm for detachably attaching an outrigger box to a rear portion of an upper slewing body.

  In a large pile driver, an outrigger box is generally attached to the rear of the main frame located at the center in the width direction of the upper structure, and a pair of jack cylinders and a back stay are attached to both sides of the outrigger box. The outrigger beam is horizontally pivotally mounted by connecting its proximal end with a pivot pin.

  In addition, since it is necessary to place the outrigger box separately from the upper revolving structure and transported separately, it is possible to easily attach and detach the outrigger box at the site because it is necessary to place the outrigger box within the mass limit range during transportation. A simple pin connection structure is adopted. In such a pin connection structure, the outrigger box connection arm provided at the rear of the main frame is inserted into the gap between the bifurcated connection arms provided at the front of the outrigger box, and these overlapping portions are connected with the connection pin (See, for example, Patent Document 1).

JP, 2013-91944, A

  In recent years, with the improvement of the digging ability of a pile driver, the weight of parts such as a working device and a leader increases, and the digging reaction force acting on the backstay from the leader tends to increase. When the leader swings left and right due to the digging reaction force during construction, one of the backstays is pushed and the other backstay is pulled to generate rotational force in the outrigger box. The rotational force is transmitted to the rear of the main frame through the connection pin, and a force is generated to try to twist the rear of the main frame. From such a thing, it is possible to thicken each connecting arm of the main frame and the outrigger box as a measure to secure the strength of the main frame even when the digging reaction force is increased, but the manufacturing cost In addition to being bulky, when attaching and detaching an outrigger box, there existed a subject that a connection pin was hard to pass through and workability | operativity deteriorated.

  Then, an object of this invention is to provide the pile driving machine provided with the outrigger box connection arm which can relieve the load which acts on a mainframe favorably although it is a simple structure.

  In order to achieve the above object, a pile driving machine according to the present invention comprises an upper slewing body pivotally provided via a swing bearing at an upper portion of a lower traveling body equipped with a crawler, and a front portion of the upper slewing body. In a pile driving machine comprising a standing leader, a gantry standing at the rear of the upper swing body, and an outrigger box provided at the rear of the upper swing body, the upper swing body is the swing bearing An outrigger box connecting arm for attaching the outrigger box is fixed to a rear end portion of the main frame, and the outrigger box connecting arm has a U-shape open forwardly. An engagement groove is provided, and the rear end portion of the main frame is inserted into the engagement groove, and the rear portion of the main frame is positioned rearward relative to the rear plate of the main frame. A first pin insertion hole through which a first connection pin for attaching a trigger box is inserted is provided, and a second connection pin for attaching the gantry at an upper position with respect to a top plate of the main frame is inserted It is characterized in that a two-pin insertion hole is provided.

  According to the pile driving machine of the present invention, since the rear portion of the main frame is inserted into and fixed to the U-shaped engaging groove provided on the outrigger box connecting arm, the main frame can be mounted via the first connecting pin. The load acting on the rear can be transmitted to the rear plate, the top plate and the bottom plate to be widely dispersed, and damage to the main frame can be prevented to improve the durability. In addition, since the second pin insertion hole through which the second connection pin for attaching the gantry is inserted is provided at the upper portion of the outrigger box connection arm, there is no need to separately provide the gantry connection arm on the main frame, and the manufacturing cost Can be reduced and the assemblability can be improved.

It is a side view of a pile driving machine which shows one example of an embodiment of the present invention. It is a rear view similarly. It is also a plan view. It is an enlarged plan view of the principal part similarly. It is a V-V cross-sectional view of FIG. It is a side view which shows the state which similarly mounted the leader and the back stay forward.

  1 to 6 show one embodiment of the pile driving machine of the present invention. The base machine 12 of the pile driving machine 11 pivotally mounts the upper swing body 15 via the swing bearing 14 on the upper portion of the lower traveling body 13 provided with the crawler 13 a and at the front of the upper swing body 15 Is provided with a leader bracket 18 to which the leader 16 and the front jacks 17 and 17 are attached, and an outrigger box 20 to which rear jacks (outrigger jacks) 19 and 19 are attached at the lower end of the rear end of the upper swing body 15; 21 are provided. Further, a gantry 22 which can be undulated is provided at the upper rear of the upper swing body 15.

  The reader 16 has a plurality of leader members 16b connected to the upper portion of a leader base member 16a which is attached to the leader bracket 18 so as to be able to tilt back and forth and right and left. A leader holder 23 is provided which holds it as possible. The leading ends of a pair of left and right back stays 24, 24 erected on the top end of the rear jack 19 are connected to the rear of the leader holder 23, and the leader 16 is supported from the rear by the back stays 24, 24 There is.

  A first winch in which an elevating rope (first wire rope) 25 for a working device (not shown) is wound in order from the front on the widthwise central portion of the upper swing body 15 between the reader 16 and the gantry 22 A third winch drum on which a drum 26, a second winch drum 28 on which an auxiliary winding rope (second wire rope) 27 is wound, and a lifting rope (third wire rope) 29 for a guide (not shown) are wound. A fourth winch drum 32 is disposed on which 30 and a winding rope (fourth wire rope) 31 for leader undulation are wound.

  The elevating rope 25 delivered from the first winch drum 26 passes through the holder guide sheave 33 provided at the upper end of the back stay 24 and the plurality of sheaves 34 a of the top sheave block 34 provided at the upper end of the reader 16. It hangs down to the front of the vehicle body and suspends the work device so as to be able to move up and down along the reader 16.

  The gantry 22 is provided with a gantry sheave 35 for guiding the undulating rope 31 drawn from the fourth winch drum 32. The undulating rope 31 is wound around a pair of upper and lower guide sheave blocks 36 and 37, and a pendant rope 38 connected to the leader holder 23 is connected to the upper guide sheave block 37.

  The gantry 22 has a pair of left and right front legs 22a, 22a and rear legs 22b, 22b, which are rotatable in the front-rear direction, and are erected at the rear of the upper swing body 15. A rotatably supported sheave pivot 39 is bridged. Furthermore, between the lower part of each front leg 22a and the upper revolving superstructure 15 is provided a gantry relief cylinder 40 for raising and lowering the gantry 22 by hydraulic pressure, and the gantry relief cylinder 40 is extended to make the upper part of the front leg 22a When raised, the gantry 22 is in a standing state, and the gantry sieve 35 is at a preset height position.

  The main frame 41 positioned at the center in the width direction of the upper swing body 15 is a box-shaped structure extending in the front-rear direction, the swing bearing 14 is attached to the lower surface of the front, and a pair of left and right outrigger boxes are connected Arms 42, 42 are provided to project rearward.

  The outrigger box connecting arm 42 is formed by cutting a steel thick plate into a tail fin shape of a fish as shown in FIG. 5 and is formed on the rear of the main frame 41 in a U-shaped engaging groove 42a opened forward. By inserting and fixing the end, a rear arm 42b extending rearward from the rear plate 41a of the main frame 41, an upper arm 42c extending diagonally upward from the top plate 41b, and a lower diagonally downward from the bottom plate 41c An extending lower arm portion 42 d is integrated with the rear end portion of the main frame 41. Further, a first pin insertion hole 42e through which the first connection pin 43 for attaching the outrigger box 20 is inserted is provided to the rear arm 42b and the lower arm 42d, and the gantry 22 is attached to the upper part of the upper arm 42c. A second pin insertion hole 42f through which the second connection pin 44 is inserted is provided.

  The outrigger box 20 has a pair of left and right connecting arms 20a and 20a protruding in the direction of the upper swing body 15 from both sides of the front end, rear jacks 19 and 19 provided on both sides, and a counterweight provided on the upper surface And a placement unit 20b. The counterweight 21 is mounted on the counterweight placement unit 20b.

  Further, the outrigger box 20 inserts the rear arm portion 42b and the lower arm portion 42d of the outrigger box connecting arm 42 into bifurcated portions formed on the upper and lower sides of the connecting arm 20a, and is provided corresponding to the first pin insertion holes 42e. The four first connection pins 43 are inserted into the four first pin insertion holes 20c at the four locations and fixed by the retaining bolts 45, so that the outrigger box 20 has four first connection pins. It will be in the state attached to the rear of upper revolving unit 15 via 43.

  Further, the gantry 22 is also attached to the outrigger box connecting arm 42. Specifically, the upper portion of the upper arm 42c is inserted into the bifurcated portion formed in the lower portion of the left and right rear legs 22b, and the second pin insertion holes 22c provided corresponding to the second pin insertion holes 42f at the two left and right positions The gantry 22 is connected to the upper portion of the outrigger box connecting arm 42 by inserting the second connecting pins 44 respectively and fixing them by means of retaining pins (not shown).

  The rear jacks 19 each include an outrigger beam 19b rotatably mounted on both sides of the outrigger box 20 in the horizontal direction via pivot pins 19a, and a jack cylinder 19c provided at an intermediate portion of the outrigger beam 19b. And a backstay connection portion 19d provided on the top end surface of the outrigger beam 19b. Further, a ground plate 19f is provided at the lower end of the cylinder rod 19e projecting downward from the lower end of the jack cylinder 19c, and the rear jack 19 is moved to the storage position and the extended position on the rear side surface of the outrigger beam 19b. An overhang cylinder 19g for fixing is provided. Further, the tip of a rod 24 a which is the lower end portion of the back stay 24 is connected to the back stay connecting portion 19 d.

  When the leader 16 is swung left and right due to the digging reaction force during construction, one of the backstays 24 is pushed and the other backstay 24 is pulled and the outrigger box 20 is pulled up to the pile driving machine 11 thus formed. A rotational force is generated. This rotational force is transmitted to the rear of the main frame 41 through the first connection pin 43, and a force is generated to try to twist the rear of the main frame 41, but the rear of the main frame 41 is connected to the outrigger box connection arm 42. Since it is inserted into and fixed to the formed U-shaped engaging groove 42a, the load can be transmitted to the back plate 41a, the top plate 41b and the bottom plate 41c and dispersed widely, and the main frame 41 is damaged. Can be suppressed to improve the durability.

  In addition, since the second pin insertion hole 42f through which the second connection pin 44 for attaching the rear leg 22b of the gantry 22 is inserted is provided at the upper portion of the outrigger box connection arm 42, the gantry connection to the main frame 41 is made. There is no need to provide an arm separately, and the manufacturing cost can be reduced and the assemblability can be improved. Furthermore, since the position of the second pin insertion hole 42f is separated at the upper position with respect to the top plate 41b of the main frame 41, the rear leg 22b interferes with attaching and detaching the outrigger box 20 to reduce workability. There is nothing to do.

  When using such a pile driving machine 11, first, the various parts transported to the site are assembled, and as shown in FIG. 6, the leader 16 and the back stay 24 are placed in front of the base machine 12 and erected. Make it possible. Next, while lifting the tip of the reader 16 using another crane (not shown), the fourth winch drum 32 is operated to wind the undulating rope 31, thereby centering the reader 16 at the base end. Start to stand up. At this time, tension acts on the relief rope 31 and the pendant rope 38, and a load in the tension direction acts on the rear leg 22b of the gantry 22. The pulling force is transmitted to the rear of the main frame 41 through the second connection pin 44, and a force is generated to bend the rear of the main frame 41 upward. Therefore, the load can be transmitted to the rear plate 41a, the top plate 41b and the bottom plate 41c to be widely dispersed. Damage can be prevented and durability can be improved.

  Finally, the leader 16 is erected, the backstay 24 is connected to the backstay connection portion 19d, and the fourth winch drum 32 is operated to feed the relief rope 31 to slacken the relief rope 31 and the pendant rope 38. 16 is supported by the back stay 24. As described above, loads of different sizes and directions are applied to the rear of the main frame 41 at the time of assembly and at the time of construction, but neither of these loads acts at the same time. Can be made larger than necessary, and the commonization of members can be realized at lower cost.

  The outrigger box connection arm only needs to have an engagement groove that can contact the back plate, top plate, and bottom plate of the main frame, and conditions such as the rear shape of the main frame and the arrangement of the gantry, etc. It can be formed into an appropriate shape according to

  11: pile driving machine, 12: base machine, 13: lower traveling body, 13a: crawler, 14: pivoting bearing, 15: upper revolving body, 16: leader, 16a: leader base member, 16b: leader member, 17: front Jack 18 Leader plate 19 Rear jack 19a Rotation pin 19b Outrigger beam 19c Jack cylinder 19d Backstay connection portion 19e Cylinder rod 19f Ground plate 19g overhang cylinder DESCRIPTION OF SYMBOLS 20 ... Outrigger box, 20a ... Coupling arm, 20b ... Counterweight mounting part, 20c ... 1st pin penetration hole, 21 ... Counterweight, 22 ... Gantry, 22a ... Front leg, 22b ... Rear leg, 22c ... 2nd pin penetration Hole 23 23 Leader holder 24 Backstay 24a Rod 25 Lifting rope 26 1st winch drum, 27: supplementary winding rope, 28: second winch drum, 29: lifting rope, 30: third winch drum, 31: undulating rope, 32: fourth winch drum, 33: holder guide sheave, 34 ... Top sheave block, 34a ... sheave, 35 ... gantry sheave, 36, 37 ... Guide sheave block, 38 ... pendant rope, 39 ... sheave pivot, 40 ... gantry relief cylinder, 41 ... main frame, 41a ... back plate, 41b ... Top plate, 41c ... bottom plate, 42 ... outrigger box connecting arm, 42a ... engaging groove, 42b ... rear arm, 42c ... upper arm, 42d ... lower arm, 42e ... first pin insertion hole, 42f ... second pin Insertion hole 43: first connection pin 44: second connection pin 45: bolt

Claims (1)

  An upper slewing body pivotally provided via a swing bearing on the upper portion of a lower traveling body equipped with a crawler, a leader erected at the front of the upper slewing body, and an erected at the rear of the upper slewing body And the outrigger box provided at the rear of the upper swing body, the upper swing body having a main frame to which the swing bearing is attached, wherein An outrigger box connecting arm for attaching the outrigger box is fixed to the rear end, and the outrigger box connecting arm is provided with a U-shaped engagement groove opened forward, and the rear end of the main frame A first connection for mounting the outrigger box at a rear position with respect to the rear plate of the main frame in a state where A first pin insertion hole through which the second connection pin is inserted, and a second pin insertion hole through which a second connection pin for attaching the gantry is mounted at an upper position with respect to the top plate of the main frame A pile driving machine characterized by

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