JP2019112159A - Construction machine - Google Patents

Abstract

To provide a construction machine with a middle sheave block which has a simple structure, is easy to attach/detach to a gantry, and also can comply with a safety at a transporting and working time.SOLUTION: A gantry 25 provided on a rear part of an upper revolving body comprises a left and right pair of the front legs 32, 32 the lower ends of which are rotatably provided on the front side of the upper revolving body, a left and right pair of the rear legs provided between the upper end of the front legs and the rear side of the upper revolving body, and a left and right pair of the gantry lifting ladders 35, 35 provided along the longitudinal direction of the upper face side of the front leg, and a middle sheave block 29 has a detachable attaching portion 29f at any position in the longitudinal direction of the gantry lifting ladder.SELECTED DRAWING: Figure 4

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a construction machine, and more particularly to a construction machine provided with a middle sheave block that connects a relief rope wound around the top of a gantry and a pendant rope connected to a relief member.

  In construction machines such as cranes and pile drivers, a gantry capable of undulation and an undulation winch for winding undulation ropes are provided at the rear of the upper revolving unit, and a boom and a boom provided at the front of the upper revolving unit. An undulating member such as a leader can be undulated by an undulating rope which is fed out from the undulating winch and bridged between a gantry sheave block pulley and a middle sheave block pulley and a middle sheave block and a pendant rope bridged between the undulating members It is supported by When transporting such a construction machine, the middle sheave block on which the undulation rope is wound and the upper revolving unit are integrally loaded on the trailer bed to reduce transportation costs and facilitate disassembly and assembly work. I am trying to For example, in a crane, a structure is known in which the middle sheave block is fixed to a middle sheave mounting device provided at the lower boom tip after separating the lower boom from the middle boom at the time of disassembling the lattice boom (for example, see Patent Document 1) ).

JP 2001-10781

  On the other hand, in the case of a large pile driver, a leader sheave and a component such as a leader bracket for supporting the leader are separately transported from the upper slewing body separately, so a mounting space for the middle sheave block is required in the upper slewing body. For this reason, it is conceivable to provide a middle sheave mounting device on the front leg of the gantry which has been laid down, but the front leg of the gantry is provided with a ladder for carrying out repair work and maintenance inspection work on the erected gantry. Therefore, it is necessary not only to remodel the ladder, but there is also a problem that the middle sheave mounting device protruding from the ladder becomes an obstacle to the rise and fall of the gantry and the safety is also impaired.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a construction machine provided with a middle sheave block which can be easily attached to and detached from a gantry with a simple structure and can be adapted to transportation safety and work safety.

  In order to achieve the above object, the construction machine of the present invention is provided with an undercarriage, an upper revolving unit pivotally provided on the upper side of the undercarriage, and an upper swingingly mounted on the front of the upper revolving unit. A relief member, a gantry provided at the rear of the upper swing body, a pendant rope having one end connected to the relief member, a middle sheave block connected to the other end of the pendant rope, and an upper end of the gantry And an undulation rope wound between the pulley of the gantry sheave block and the pulley of the middle sheave block, and the upper swing body for winding and unwinding the undulation rope. And a gantry, the lower end of the gantry is rotatably mounted on the front side of the upper revolving structure. A pair of left and right rear legs provided between the upper end of the front leg and the rear side of the upper swing body, and a pair of left and right gantry elevator forceps provided along the upper surface side longitudinal direction of the front leg The middle sheave block is characterized by having a detachable mounting portion at any position in the longitudinal direction of the gantry lifting forceps.

  Further, the middle sheave block has a case in which the pulley is accommodated, and the gantry lifting forceps are a pair of vertical beams provided parallel to each other along the longitudinal direction of the front leg, and the pair of vertical beams And a plurality of horizontal bars connecting the two, and the mounting portions are respectively provided on the left and right sides of the case, and the lower surfaces of the left and right sides of the case are in contact with the upper surfaces of the vertical bars. It is characterized in that it is a bifurcated bracket sandwiching a crosspiece.

  Further, the bracket has a pin insertion hole through which a fixing pin for preventing the middle sheave block from falling out of the gantry lifting forceps is inserted, and in addition, the bracket is the middle It is characterized by having a hanging portion for lifting the sheave block.

  According to the construction machine of the present invention, since the middle sheave block has the detachable attachment at any position in the longitudinal direction of the gantry lifting forceps provided on the front leg of the gantry, the state where the gantry is laid down In addition, it is possible not only to satisfy the height restriction at the time of transportation by fastening the middle sheave block to the lower side of the gantry lifting forceps, but also by fastening the middle sheave block to the upper side of the gantry lifting forceps It is also possible to easily and safely prepare for new construction or replacement.

  Furthermore, while providing the attachment parts of the middle sheave block on both left and right sides of the case and forming the left and right lower faces of the case in contact with the upper face of the vertical crosspiece, form the bifurcated bracket sandwiching the horizontal crosspiece As a result, the weight of the middle sheave block can be dispersedly supported by the vertical rail, and the middle sheave block can be stably supported without falling off the gantry lifting force while facilitating the miniaturization of the mounting portion. it can.

It is a side view of a pile driving machine which shows one example of an embodiment of the present invention. It is a side view of the pile driving machine which shows the state which fixed the middle sheave block to the gantry which was also laid down. It is also a plan view. It is a principal part top view similarly. It is a principal part side view similarly. It is the VI-VI sectional view of FIG.

  1 to 6 show an example of one embodiment in which the construction machine of the present invention is applied to a pile driver, and the pile driver 11 is, as shown in FIGS. 1 to 3, traveling at the bottom with crawlers 12a. An upper revolving structure 14 is pivotally provided on the upper part of the body 12 via a revolving bearing 13, and at a front portion of the upper revolving structure 14, a relief member (not shown) for pile driving such as a leader is provided. It is provided.

  On the floor frame 14a of the upper revolving superstructure 14, the driver's room 15 and the equipment room 16 are provided on the right side and the engine room 17 containing the engine and hydraulic pump on the left side. A plurality of inspection doors 18 and a house lifting ladder 19 are provided in the housing. Further, at the front of the engine compartment 17, a stair 20 for moving from the floor frame 14a to the ceiling of the engine compartment 17 is provided. Further, a plurality of handrails 21 are detachably provided on the ceilings of the equipment room 16 and the engine room 17.

  An outrigger box 23 to which rear jacks (outrigger jacks) 22 and 22 are attached and a counterweight 24 mounted on the outrigger box 23 are provided at the lower end of the rear end of the upper swing body 14. Further, a gantry 25 is provided at the upper rear of the upper swing body 14.

  The gantry 25 is provided with a guide sheave 28 for guiding a relief rope 27 fed from a relief winch 26 provided at the center rear of the upper swing body 14. The ups and downs ropes 27 rise from the ups and downs winches 26 and pass around the guide sheaves 28 and are wound around the front middle sheave block 29 and the gantry sheave block 30 so that the rope ends are fixed to the gantry sheave block 30. Furthermore, the middle sheave block 29 is connected to the other end of a pendant rope (not shown) whose one end is connected to the leader side, and by winding the winding rope 27 with the winding winch 26 or unwinding it. The leader can be raised and lowered.

  The gantry 25 has a pair of left and right front legs 32 and 32 rotatably mounted in the front and rear direction on a pair of left and right connecting arms 31 and 31 provided at the front of the upper swing body 14, and the front legs 32 and 32. The pair of left and right rear legs 33, 33 provided between the upper end of the upper revolving unit 14 and the rear of the upper revolving unit 14 are combined with each other to be provided on the rear of the upper revolving unit 14 in an undulating manner. Furthermore, a support shaft 34 rotatably supporting the guide sheave 28 is stretched over the gantry 25. In addition, the upper swing body 14 is provided with a gantry relief cylinder (not shown) for raising and lowering the gantry 25 by hydraulic pressure.

  As described above, after the gantry 25 extends the gantry relief cylinder and raises the front leg 32 by a predetermined angle, the gantry 25 takes up the uplift rope 27 and extends the telescopic rear leg 33 while raising the upper end of the front leg 32. The guide sheave 28 is in an upright state (FIG. 1) positioned at a preset height. On the other hand, after retracting the gantry relief cylinder, the relief rope 27 is delivered and the upper end of the front leg 32 is lowered, so that the rear leg 33 is reduced and the guide sheave 28 is located rearward from the counterweight 24 (FIG. 2) )become.

  A pair of left and right gantry lifting forceps 35 for raising and lowering to the top of the gantry 25 raised is provided on the upper surface of the pair of left and right front legs 32, 32. For example, detachment of the relief rope 27 occurs The gantry lifting forceps 35 are used when performing an emergency repair operation or a regular maintenance inspection operation. The gantry lifting forceps 35 includes a pair of vertical bars 35a, 35a provided parallel to each other along the upper surface side longitudinal direction of the front leg 32, and a plurality of horizontal bars 35b connecting the pair of vertical bars 35a, 35a. An inner mounting arm 35c formed of an L-shaped bent plate material provided at a plurality of locations of the inner longitudinal bar 35a, and an outer side formed of a crank-shaped bent plate material provided at a position corresponding to the inner mounting arm 35c of the outer longitudinal bar 35a It has a mounting arm 35d, and is fixed to the peripheral wall of the front leg 32 with a bolt 36 via both mounting arms 35c and 35d.

  As shown in FIGS. 4 to 6, in the middle sheave block 29, a plurality of sheaves 29a on which the undulating rope 27 is wound from the rear (right side in FIG. 4) and the plurality of sheaves 29a are stored. A rectangular box-like case 29b in plan view, a pair of left and right holding portions 29c, 29c protruding forward from both front ends of the case 29b, and an inner side of the holding portion 29c from the front of the case 29b It projects outward from the left and right side surfaces of the case 29b, and a pair of left and right fixing portions 29d and 29d which are provided to project forward, a pair of left and right guide parts 29e and 29e which are installed downward from the lower surface of the case 29b. It has a pair of left and right mounting portions 29f, 29f.

  The holding portion 29c is a bifurcated bracket, into which a holding bracket (not shown) for holding a pendant rope is inserted, and a fixing pin 37 is inserted into a pin insertion hole 29g formed in the overlapping portion of each other. It is held off at 38. From this state, the leader can be raised and lowered by winding up and down the relief rope 27 with the relief winch 26.

  The fixing portion 29d is a bifurcated bracket, and while the fixing bracket is inserted in a state in which the guide portion 29e is engaged with a fixing bracket (not shown) protruding from the reader, the fixing portions are formed in overlapping portions. The fixing pin 39 is inserted into the pin insertion hole 29 h and is held off by the beta pin 40. From this state, the gantry 25 can be undulated by winding the undulation rope 27 with the undulation winch 26 or unwinding.

  The mounting portion 29f is a bifurcated bracket for attaching and detaching the middle sheave block 29 to any position in the longitudinal direction of the gantry lifting forceps 35 during transportation of the pile driving machine 11 or when new construction or replacement of the relief rope 27 is performed. There is provided a pin insertion hole 29k in which lower portions of the front side plate 29i and the rear side plate 29j are protruded downward from the horizontal crosspiece 35b and the fixing pin 41 is inserted. Further, a round hole 29m which is a hanging portion for lifting up the middle sheave block 29 is provided at the upper portion of the front side plate 29i.

  At the four corners of the lower surface of the case 29b, projections 29n for positioning the middle sheave block 29 in the left-right direction with respect to the gantry lifting forceps 35 are provided. The protrusion 29 n is disposed between the inner longitudinal bars 35 a, 35 a by welding a round bar of a predetermined length extending in the front-rear direction of the case 29 b to the lower surface of the case 29 b.

  When transporting the pile driving machine 11 provided with the middle sheave block 29 formed in this manner, first, the pendant rope is removed from the holding portion 29c of the middle sheave block 29, and the round hole 29m of the mounting portion 29f is used. The crane lifts the middle sheave block 29 together with the relief rope 27 and moves it above the gantry 25 in the collapsed state. Subsequently, the middle sheave block 29 is adjusted to the lower portion of the gantry lifting forceps 35, that is, just above the position where the mounting height of the middle sheave block 29 is lowered, so that the left and right mounting portions 29f, 29f The lower portions 35b and 35b are respectively lowered so as to sandwich them, and the lower surfaces of the left and right sides of the case 29b are brought into contact with the upper surfaces of the inner longitudinal bars 35a and 35a. As a result, the middle sheave block 29 is restricted from moving in the front-rear direction with respect to the gantry lifting forceps 35 by the mounting portion 29f, and the movement in the left-right direction is restricted by the projecting portions 29n. Be supported. Finally, the fixing pin 41 is inserted into the pin insertion hole 29k of the mounting portion 29f and is secured by the beta pin 42. Thus, the middle sheave block 29 is fixed to the lower part of the gantry lifting forceps 35 (imaginary line in FIG. 3).

  On the other hand, when the new installation or replacement of the relief rope 27 is performed, the middle sheave block 29 is placed at a predetermined position on the upper part of the gantry lifting forceps 35, specifically, the relief rope 27 is made up of the middle sheave block 29 and the gantry sheave block 30. In the same position as described above, the gantry 29 is fixed to the gantry lifting forceps 35 at a position which does not give excessive bending or slack when it is wound around, and in this state (solid line in FIG. 3) Is done.

  As described above, since the middle sheave block 29 has the detachable attachment portion 29 f at any position in the longitudinal direction of the gantry lifting forceps 35 provided on the front leg of the gantry 25, the state where the gantry 25 is laid down. The middle sheave block 29 is fastened to the lower side of the gantry lifting forceps 35 so that height restrictions can be satisfied during transportation, and the middle sheave block 29 is fastened to the upper side of the gantry lifting forceps 35 In addition, it is possible to easily and safely carry out the work of setting up and replacing the undulating rope 27. Further, there is no need to modify the gantry sheave block 35 to attach the middle sheave block 29, and the gantry 25 can be safely raised and lowered.

  Further, the mounting portions 29f of the middle sheave block 29 are provided on the left and right sides of the case 29b, and the left and right lower surfaces of the case 29b are in contact with the upper surfaces of the vertical bars 35a. The weight of the middle sheave block 29 can be dispersed and supported by the vertical crosspiece 35a by forming the bracket with the bracket, and the middle sheave block 29 can be easily made smaller from the gantry lifting forceps 35 while facilitating the miniaturization of the mounting portion 29f. It can be stably supported without falling off.

  In addition, the lower portion of the front side plate 29i and the rear side plate 29j of the mounting portion 29f has a pin insertion hole 29k through which the fixing pin 41 for preventing the middle sheave block 29 from falling out of the gantry lifting forceps 35 is inserted. It is possible to further enhance the safety at the time of transportation and at the time of preparation operation of the relief rope 27. Furthermore, since the round hole 29m for lifting the middle sheave block 29 is provided at the top of the front side plate 29i, the middle sheave block 29 can be easily and quickly lifted using a crane or the like.

  The present invention is not limited to the embodiment described above, and the mounting portion of the middle sheave block may be of any size and shape as long as it can be attached to the left and right gantry lifting forceps, and conditions such as the shape of the gantry lifting force Accordingly, the mounting portion can be configured appropriately. Further, the mounting position of the gantry lifting forceps is not limited to the above-described embodiment, and may be fixed to the middle portion or the upper portion of the gantry lifting forceps and transported as long as the height restriction can be satisfied. Moreover, in the said embodiment, although the pile driver was illustrated as a construction machine, it can apply to the various construction machines which mount a gantry in the back part of a revolving super structure, such as an earth drill and a crane.

  11: pile driving machine, 12: lower traveling body, 12a: crawler, 13: swing bearing, 14: upper revolving body, 14a: floor frame, 15: driving room, 16: equipment room, 17: engine room, 18: inspection Doors 19 House lifting ladders 20 Stairs 21 Handrails 22 Rear jacks 23 Outrigger boxes 24 Counter weights 25 Gantry 26 Ramp winches 27 Roping ropes 28 Guide sheaves 29: Middle sheave block, 29a: Pulley, 29b: Case, 29c: Holding portion, 29d: Fixing portion, 29e: Guide portion, 29f: Mounting portion, 29g, 29h: Pin insertion hole, 29i: Front side plate, 29j: Rear Side plate, 29 k: Pin insertion hole, 29 m: Round hole, 29 n: Projection, 30: Gantry sheave block, 31: Linking arm, 32: Front leg, 33: Rear leg, 4 ... Support shaft, 35 ... Gantry lift ladder, 35a ... Longitudinal crosspiece, 35b ... Horizontal crosspiece, 35c ... Inside mounting arm, 35d ... Outside mounting arm, 36 ... Bolt, 37 ... Fixing pin, 38 ... Beta pin, 39 ... Fixing pin , 40 ... beta pin, 41 ... fixed pin, 42 ... beta pin

Claims (4)

  A lower traveling body, an upper revolving body pivotally provided at an upper portion of the lower traveling body, an undulating member which is provided in a movable manner at a front portion of the upper revolving body, and a rear portion of the upper revolving body A gantry rope, a pendant rope whose one end is connected to the relief member, a middle sheave block connected to the other end of the pendant rope, a gantry sheave block provided on the top end of the gantry, and the gantry sheave block A construction machine comprising an undulating rope wound between a pulley and a pulley of the middle sheave block, and an undulating drum mounted at the rear of the upper swing body for winding and unwinding the undulating rope In the gantry, the lower end of the gantry is provided with a pair of left and right front legs rotatably provided on the front side of the upper swing body, an upper end portion of the front leg, and a rear side of the upper swing body And a pair of left and right rear legs provided between the left and right, and a pair of left and right gantry elevator forceps provided along the upper surface side longitudinal direction of the front leg, and the middle sheave block is a longitudinal direction of the gantry lifter forceps. A construction machine having a detachable mounting portion at an arbitrary position.   The middle sheave block has a case in which the pulleys are accommodated, and the gantry lifting forceps includes a pair of vertical bars provided parallel to each other along the longitudinal direction of the front leg, and the pair of vertical bars The crosspieces are provided with a plurality of crosspieces to be connected, the attachment portions being respectively provided on the left and right sides of the case, and the left and right lower surfaces of the case are in contact with the top surfaces of the longitudinal pieces. The construction machine according to claim 1, wherein the construction machine is a bifurcated bracket to be sandwiched.   The construction machine according to claim 2, wherein the bracket has a pin insertion hole through which a fixing pin for preventing the middle sheave block from falling out of the gantry lifting forceps.   The construction machine according to claim 2 or 3, wherein the bracket has a hanging portion for lifting the middle sheave block.

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