JP7019469B2 - Pile driver and lifting method of pile driver - Google Patents

Description

The present invention relates to a pile driver, and more particularly to a pile driver having a hanging portion for attaching and detaching a wire rope for lifting to an upper swivel body and a method for lifting the pile driver.

Conventionally, when a construction machine equipped with a crawler such as a hydraulic excavator is carried in and out, the whole vehicle body is lifted by the hoisting operation of a crane, so-called round suspension. In this round suspension, for example, a method in which a suspension portion is provided in a front working portion such as a boom and a suspension portion in a vehicle body rear portion such as a counterweight, and the tip of a lifting rope is attached to the suspension portion to be lifted (for example). , Patent Document 1).

On the other hand, large cranes and pile drivers are equipped with a gantry (A frame) that can be undulated at the rear of the upper swivel body, and when performing round suspension, the lifting rope on the front side is swivel that constitutes the vehicle body. Attached to the boom support or leader bracket support provided at the front end of the frame, the rear lifting ropes are attached to the gantry support shafts fixed in the retracted position, and these lifting ropes can be used with other cranes. (For example, refer to Patent Document 2).

In addition, large pile drivers are generally equipped with a back tension device on the rear side of the reader, which is the front work part, and a hydraulic cylinder provided on the upper surface of the leader bracket applies tension to the wire rope for back tension. In addition, the leader is prevented from bending forward due to the propulsive force and the pulling force of the auger (see, for example, Patent Document 3). Therefore, the hydraulic cylinder, which is a component of the back tension device, is removed from the upper swing body integrally with the leader bracket when the vehicle is suspended in a circle.

JP-A-2002-371592. Japanese Patent Application Laid-Open No. 2003-81579 Japanese Unexamined Patent Publication No. 2001-336150

By the way, when transporting the above-mentioned pile driver, it is more efficient to suspend the pile driver itself without disassembling it in a place where there is no problem in weight limitation. However, with the leader bracket attached to the upper swing body, there is no suitable place to attach the lifting rope on the front side, and it becomes necessary to separately provide a dedicated hanging portion. Moreover, since it is lifted with various parts attached, the weight of the car body is extremely heavy, and the lifting rope needs to have a large diameter in order to demonstrate its performance. For example, a thick metal wire rope with a diameter of 40 mm. Is used. Therefore, there is a problem that the holding state hung on the hanging portion is not stable before lifting.

Therefore, paying attention to the high tensile strength provided in the mounting portion of the hydraulic cylinder, a method of hanging a lifting rope around a fixing pin after removing the hydraulic cylinder can be considered. However, this method has a problem that the lifting rope directly touches the outer peripheral surface of the fixing pin and is strongly bent due to the hoisting operation of the crane.

Therefore, an object of the present invention is to provide a pile driver and a method for lifting a pile driver, which have a simple structure and can easily and stably attach / detach the lifting rope.

In order to achieve the above object, the pile driver of the present invention has a lower traveling body provided with a crawler, an upper turning body provided so as to be swivel on the upper part of the lower traveling body, and a front portion of the upper turning body. A leader erected on the leader bracket provided, a back tension rope provided on the rear side of the leader, a hydraulic cylinder for applying tension to the back tension rope, and a leader provided on the upper surface of the leader bracket. In a pile driver provided with a bifurcated portion to which a base end portion of the hydraulic cylinder is detachably mounted, the bifurcated portion is lifted for lifting the vehicle body of the pile driver with the hydraulic cylinder removed. It is characterized in that a cylindrical boss member for hanging a rope is formed so as to be mountable. Further, the boss member is characterized by having a concave groove having an arcuate cross section on the outer peripheral surface on which the lifting rope can be hung in a U shape.

Further, the method for lifting the pile driver of the present invention is provided on a lower traveling body provided with a rope, an upper turning body provided so as to be able to turn on the upper part of the lower running body, and a front portion of the upper turning body. A leader installed on the leader bracket, a back tension rope provided on the rear side of the leader, a hydraulic cylinder for applying tension to the back tension rope, and the hydraulic pressure provided on the upper surface of the leader bracket. It is a pile driver equipped with a bifurcated portion to which the base end portion of the cylinder is detachably attached, and the bifurcated portion is a cylindrical shape for hanging a lifting rope with the hydraulic cylinder removed. In the method of lifting a pile driver in which a boss member can be mounted, the arcuate lower end of the lifting rope hanging from the hook of the crane is inserted into the bifurcated portion, and the lifting rope is attached to the leader bracket. It includes a step of holding the boss member on the upper surface, a step of inserting the boss member into the bifurcated portion and attaching it with a fixing pin, and a step of hanging the lifting rope around the boss member to lift the vehicle body of the pile driver . It is a feature.

According to the present invention, the bifurcated portion to which the hydraulic cylinder of the back tension device is attached also serves as a suspension portion for lifting the vehicle body, so that the strength of the suspension portion can be increased even when the suspension portion is lifted with heavy parts such as a leader bracket and an outrigger box attached. It is satisfactory, and the members can be standardized, and the suspended portion can be formed at low cost. In addition, since the lifting rope is hung around the concave groove of the boss member, not only can the bending stress of the lifting rope be relaxed, but also problems such as wear of the rope surface and formation of indentations can be prevented. can. Furthermore, by inserting the lower end of the lifting rope into the bifurcated part, it is possible to stably hold the lifting rope before lifting, and the lifting work of the vehicle body can be easily and quickly performed with little effort and operation. be able to.

It is a side view of the pile driver which shows one embodiment of this invention. Similarly, it is a side view which shows the state which the lifting rope is attached to the car body. Similarly, it is an enlarged side view of the main part. Similarly, it is an enlarged front view of the main part. FIG. 2 is a sectional view taken along line VV of FIG.

1 to 5 show an example of a form of the pile driver of the present invention. In the pile driver 11 shown in the present embodiment, the upper swivel body 13 is placed on the upper part of the lower traveling body 12 provided with the crawler 12a. Is provided so that it can turn. A leader bracket 15 for supporting the leader 14 is provided on the front portion of the upper swivel body 13, and the leader 14 is provided with a top sheave block 16 at the top thereof and is supported by a back stay 17 from the rear.

The upper swing body 13 is provided with a driver's cab 18 and an equipment room (not shown) on the right side, and an engine room 19 for accommodating an engine and a hydraulic pump on the left side. Further, an outrigger box 20 and a counterweight 21 mounted on the outrigger box 20 are provided at the lower part of the rear end of the upper swing body 13. Further, an undulating gantry 22 is provided above the rear portion of the upper swivel body 13.

The top sheave block 16 is provided on the top of the reader 14 in the front-rear direction, and an auger rope 23 for raising and lowering a work device such as an auger (not shown) is hung on the front side on the front side. Is provided with a rope latch 24. Further, the back tension rope 25 has an upper end portion attached to the rope latch 24, an intermediate portion bifurcated downward via a relay member 26 provided on the rear side of the reader 14, and a lower end portion of the leader bracket 15. It is attached to a pair of left and right hydraulic cylinders 27, 27, respectively.

The back tension device 28 connects the base end portion of the cylinder tube 27a to the bifurcated portions 29 provided on the left and right upper surfaces of the leader bracket 15 by a fixing pin 30 so as to be rotatable back and forth and tilted left and right, and a rope for back tension. The lower end of the 25 is connected to the tip of the piston rod 27b, and the back tension rope 25 is tensioned by contracting the piston rod 27b. Further, the bifurcated portion 29 is formed so that the base end portion of the cylinder tube 27a can be inserted and removed in a space 29b in which two plate-shaped brackets 29a and 29a are provided at predetermined intervals.

The gantry 22 rotates in the front-rear direction between a pair of left and right front legs 31 rotatably mounted on the front portion of the upper swivel body 13 and between the upper end of the front legs 31 and the rear portion of the upper swivel body 13. A pair of left and right rear legs 32, which are movable and expandable, are combined with each other and provided undulatingly at the rear portion of the upper swing body 13. Further, a support shaft 35 that rotatably supports the guide sheave 34 that guides the undulating rope 33 is hung on the upper portion of the gantry 22.

The undulating rope 33 rises upward from the undulating winch (not shown), is hung around the front middle sheave block 36 and the gantry receive block 37 via the guide sheave 34, and the rope end is fixed to the gantry receive block 37. There is. Further, the other end of the pendant rope 38 whose one end is connected to the reader 14 is connected to the middle sheave block 36, and the leader 14 is undulated by winding or unwinding the undulating rope 33 with an undulating winch. be able to.

When transporting such a pile driver 11 between sites having high and low steps, the bifurcated portion 29 becomes a suspending portion to which a lifting rope 39 is attached, and the upper swivel body 13, the leader 14, the counterweight 21, etc. With some heavy parts removed, the vehicle body is lifted using a crane to move it to the desired high or low position.

As shown in FIGS. 3 and 4, the boss member 40 on which the lifting rope 39 is hung corresponds to the outer diameter of the lifting rope 39 on the cylindrical outer peripheral surface through which the fixing pin 30 is penetrated in the axial direction. A concave groove 40a having an arcuate cross section is provided. Further, the outer diameter of the boss member 40 is a size that can be attached to the bifurcated portion 29, and the lifting rope is hung in a U-shape in the concave groove 40a by applying tension to the lifting rope 39. It is formed in a size that satisfies the allowable bending radius of 39.

A metal wire rope is used for the lifting rope 39, and the rope is formed to have a diameter of a predetermined thickness, for example, a diameter of 40 mm. Further, both ends of the lifting rope 39 are engaged with the hook 41 of the crane.

Here, a procedure for lifting the pile driver 11 will be described with reference to FIGS. 2 to 5. First, the leader 14 and the counterweight 21 are removed from the upper swing body 13, and the fixing pins 30 are removed to remove the left and right hydraulic cylinders 27 from the bifurcated portions 29, respectively. Next, with the gantry 22 lying down, all four hoisting ropes 39 prepared are engaged with the hook 41. At this time, the two rear ropes are hung around both ends of the support shaft 35 of the gantry 22, and the crane is wound down with the two front ropes positioned directly above the bifurcated portion 29. As a result, the arc-shaped lower end of the lifting rope 39 is inserted into the space 29b of the bifurcated portion 29 and brought into contact with the upper surface of the leader bracket 15, which is the holding stage shown by the imaginary line in FIG.

Subsequently, the boss member 40 is inserted into the space 29b of the bifurcated portion 29, the fixing pin 30 is inserted, and the fixing pin 30 is prevented from coming off by the retaining plate 42. Finally, when the crane is wound up and tension is applied to the four lifting ropes 39, the lower ends of the two front lifting ropes 39 are separated from the upper surface of the leader bracket 15, respectively, and FIGS. 3 and 4 show. As shown in FIG. 5, each of the two hoisting ropes 39 on the rear side is hung around the concave groove 40a of the boss member 40 in a U shape, and the lower ends thereof are at both ends of the support shaft 35 as shown in FIG. It is hung around the outer peripheral surface in a U shape. By continuing the hoisting operation of the crane in this state, the crawler 12a is separated from the ground and the vehicle body is lifted. Further, after moving the vehicle body to a desired place, the lifting rope 39 is removed from the vehicle body in the reverse procedure described above.

In this way, since the bifurcated portion 29 to which the hydraulic cylinder 27 of the back tension device 28 is attached also serves as a suspension portion for lifting the vehicle body, the suspension portion is lifted even when heavy parts such as the leader bracket 15 and the outrigger box 20 are mounted. The strength of the suspension can be satisfied, and the members can be standardized so that the suspended portion can be formed at low cost. Further, since the lifting rope 39 is hung around the concave groove 40a of the boss member 40, not only the bending stress of the lifting rope 39 can be relaxed, but also the surface of the rope is worn or indentations are formed. It is also possible to prevent such problems. Further, by inserting the lower end portion of the lifting rope 39 into the bifurcated portion 29, it is possible to stably hold the lifting rope 39 before lifting, and the lifting work of the vehicle body can be easily performed with a small amount of labor and operation. It can be done quickly.

The present invention is not limited to the above embodiment, and the present invention is as long as the suspension portion to which the lifting rope on the front side is attached has a structure in which the hydraulic cylinder and the boss member can be selectively attached and detached. It can be appropriately changed within the range of, for example, it is not necessary to provide a concave groove in the boss member. Further, the hanging portion to which the lifting rope on the rear side is attached is not limited to the support shaft of the gantry as long as it has the strength and rigidity to safely lift the vehicle body, for example, the support of the vehicle body. A hanging portion may be provided on the frame, the outrigger box, or the like, and can be appropriately changed according to the state of the vehicle body at the time of lifting.

11 ... Pile driver, 12 ... Lower running body, 12a ... Crawler, 13 ... Upper swivel body, 14 ... Leader, 15 ... Leader bracket, 16 ... Top sheave block, 17 ... Backstay, 18 ... Driver's cab, 19 ... Engine Room, 20 ... out trigger box, 21 ... counter weight, 22 ... gantry, 23 ... auger rope, 24 ... rope hook, 25 ... back tension rope, 26 ... relay member, 27 ... hydraulic cylinder, 27a ... cylinder tube, 27b ... Piston rod, 28 ... Back tension device, 29 ... Bifurcated part, 29a ... Bracket, 29b ... Space, 30 ... Fixed pin, 31 ... Front leg, 32 ... Rear leg, 33 ... Undulating rope, 34 ... Guide sheave, 35 ... Support shaft, 36 ... middle sheave block, 37 ... gantry receive block, 38 ... pendant rope, 39 ... lifting rope, 40 ... boss member, 40a ... concave groove, 41 ... hook, 42 ... retaining plate

Claims (3)

A lower traveling body provided with a crawler, an upper turning body provided so as to be swivel on the upper part of the lower traveling body, a leader erected on a leader bracket provided on the front portion of the upper turning body, and the leader. A back tension rope provided on the rear side, a hydraulic cylinder for applying tension to the back tension rope, and a bifurcation provided on the upper surface of the leader bracket and to which the base end portion of the hydraulic cylinder is detachably attached. In a pile driver equipped with a portion, the bifurcated portion can be equipped with a cylindrical boss member for hanging a lifting rope for lifting the vehicle body of the pile driver with the hydraulic cylinder removed. A pile driver characterized by being formed in. The pile driver according to claim 1, wherein the boss member has a concave groove having an arcuate cross section on the outer peripheral surface on which the lifting rope can be hung in a U shape. A lower traveling body provided with a rope, an upper turning body provided so as to be swivel on the upper part of the lower traveling body, a leader erected on a leader bracket provided on the front portion of the upper turning body, and the leader. A back tension rope provided on the rear side, a hydraulic cylinder for applying tension to the back tension rope, and a bifurcation provided on the upper surface of the leader bracket and to which the base end portion of the hydraulic cylinder is detachably attached. It is a pile driver provided with a portion, and the bifurcated portion is formed so that a cylindrical boss member for hanging a lifting rope can be attached to the bifurcated portion with the hydraulic cylinder removed. In the lifting method, the step of inserting the arc-shaped lower end portion of the lifting rope hanging from the hook of the crane into the bifurcated portion and holding the lifting rope on the upper surface of the leader bracket, and the boss member being held in the bifurcated portion. A method for lifting a pile driver, which comprises a step of inserting the rope into a portion and attaching the rope with a fixing pin, and a step of hanging the lifting rope around the boss member to lift the vehicle body of the pile driver.

Images