JP6738779B2 - Pile driver and method of changing the posture of the pile driver - Google Patents

Description

The present invention relates to a pile driver, and relates to, for example, a pile driver and a method of changing the posture of a pile driver capable of running, driving a pile, and changing the posture of a leader in an existing building having a low ceiling.

In the pile driver, a driving device is attached to the front part of the vehicle body via a member called a leader. The placing device grips the pile (steel material or the like) and rotates, and the placing device descends along the leader to place the pile on the ground (see Patent Document 1, etc.).

JP, 2007-291807, A

In recent years, redevelopment projects in urban areas have been actively carried out, and there are cases in which expansion and renovation of commercial facilities and construction of new structures are performed without interrupting business. In that case, a lot of temporary work will be carried out as the redevelopment project progresses, and it will be necessary to perform the basic work of temporary work in the commercial facilities that are in operation due to the business reasons of various related commercial facilities. In some cases. In this case, the pile driver cannot be parked near the foundation construction site, and it may be necessary to move the pile driver through the pedestrian passage leading to the foundation construction site. In this way, the height of the space is limited due to the low ceiling inside the facility for both the foundation construction site and the movement route, and it moves to the foundation construction site in the running posture in the facility, changing the posture of the leader to the working posture and driving the piles. In order to do so, for example, the leader must be shortened and kept at about the height of the cab. In order to suppress the height of the upper end of the leader in both the working posture and the traveling posture, it is advantageous to omit a so-called backstay cylinder that tilts the leader forward and backward. However, heavy equipment such as cranes cannot enter in the space where the height is limited, and the leader cannot be tilted backward with respect to the revolving structure without the backstay cylinder. Even if the leader is not inclined, it is sufficient if the movement route in the commercial facility is flat, but it is not always flat and there may be a slope in the middle. In order to cross the slope, the leader must be tilted backwards to ensure a departure angle.

In addition, if a transportation facility such as a railroad is associated with a commercial facility where the pile driver runs or works, the forward movement of the pile driver and the work posture can be changed in a short time outside the business hours of the transportation facility. It is necessary to change the posture, drive the piles, change the posture to the running posture, and move back. Therefore, if time is spent changing the posture of the leader, the time for carrying out the pile driving work will be lost.

An object of the present invention is to perform traveling, piling work, and posture change of a leader in a space where the height is limited by the ceiling, and to carry out piling work efficiently under great spatial and time constraints. (EN) A possible pile driver and a method for changing the posture of the pile driver.

In order to achieve the above object, the present invention provides a traveling body, a revolving structure having an operator cab provided on the traveling structure, and a pile driving machine connected to a revolving frame which is a base frame of the revolving structure. The pile driving machine has a leader rotatably connected to the revolving frame via a shaft extending in the left-right direction, a placing device that moves up and down along the leader, a winch provided on the leader, and A winch arm having a pulley for hooking a wire on the tip is provided on the top of the leader, and the posture is changed from a work posture in which the leader stands up to a traveling posture in which the leader leans backward and from the traveling posture to the working posture. In the pile driving machine including a posture changing device, the length is set such that the upper end of the leader is lower than the upper end of the operator's cab in the working posture, and the posture changing device includes the working posture. A first link connecting the leader to the turning frame, a second link connecting the leader in the running posture to the turning frame, and an attachment having wheels at the lower end and graspable by the driving device. The first link and the second link constituting the posture changing device are formed as an integral link, and a post is provided at a front portion of the swing frame. A lifting machine for adjusting the angle of the supported integral link is provided .

According to the present invention, since the leader is short and the upper end of the leader is lower than the upper end of the operator's cab, the pile driving work can be performed even at a foundation construction site where the height is limited by the ceiling inside the building. Further, the attachment having the wheels at the lower end is grasped by the placing device, the first link is removed, the restraint of the leader is released, and the placing device is lowered, so that the leader can be moved by itself without the backstay cylinder. Can be tilted backwards. This makes it possible to efficiently change the posture from the work posture to the running posture even in a space with a limited height, and to move the slope while securing the departure angle or to get on and off the transport vehicle by self-propelled. You can The posture can be easily changed from the running posture to the working posture. Therefore, it is possible to travel, pile driving, and change the posture of the leader in a space where the height is limited by the ceiling, and the pile driving can be efficiently performed with great spatial and time constraints. ..

The side view showing the whole pile driver composition concerning one embodiment of the present invention. The side view which extracted and showed the connection part of the leader and turning frame of the pile driver shown in FIG. The side view showing a state in which the link provided in the pile driver shown in FIG. 1 is rotated (standing) up to the limit. A side view of an attachment with which a pile driver concerning one embodiment of the present invention was equipped. Front view of an attachment provided in a pile driver according to an embodiment of the present invention Diagram showing how the pile driver shown in Figure 1 travels inside a commercial facility to the foundation construction site. Explanatory drawing of the posture changing method from the working posture to the traveling posture of the pile driver shown in FIG. Explanatory drawing of the posture changing method from the working posture to the traveling posture of the pile driver shown in FIG. Explanatory drawing of the posture change method from the working posture of the pile driver shown in FIG. 1 to a running posture Explanatory drawing of the posture changing method from the working posture to the traveling posture of the pile driver shown in FIG. Explanatory drawing of the posture changing method from the working posture to the traveling posture of the pile driver shown in FIG. Explanatory drawing of the posture changing method from the working posture to the traveling posture of the pile driver shown in FIG. Explanatory drawing of the posture changing method from the working posture to the traveling posture of the pile driver shown in FIG. Explanatory drawing of the posture changing method from the working posture to the traveling posture of the pile driver shown in FIG. Explanatory drawing of the posture changing method from the working posture to the traveling posture of the pile driver shown in FIG.

Embodiments of the present invention will be described below with reference to the drawings.

1. Pile driver FIG. 1 is a side view showing the overall configuration of a pile driver according to an embodiment of the present invention. In the present embodiment, the left and right in the figure are the front and rear of the pile driver, and the front and back sides in the direction orthogonal to the paper surface are the left and right of the pile driver. The pile driver shown in FIG. 1 uses a hydraulic excavator as a base machine and includes a vehicle body 10 and a pile driver 50. The vehicle body 10 includes a traveling body 20 and a swing body 30.

The traveling body 20 includes a track frame 21 and a pair of left and right crawlers 22. The left and right crawlers 22 respectively include driven wheels 23 and drive wheels (not shown) attached to the front and rear of the track frame 21, and crawler belts 25 wound around the driven wheels 23 and drive wheels. A traveling driving device 24 such as a hydraulic motor is connected to the driving wheels, and the crawler 22 is driven by the traveling driving device to drive the pile driver. The traveling drive device 24 is composed of a motor and a speed reducer whose output shaft is connected to drive wheels. The traveling body 20 may be a wheel type instead of the crawler type.

The revolving structure 30 is a main body of a pile driver provided on the upper part of the traveling structure 20 for revolving, and includes a revolving frame 31, a driver's cab 32, a power room 33, and a counterweight 34. The revolving frame 31 is a base frame of the revolving structure 30, and includes a frame main body 36 and a front frame 37. The frame main body 36 is connected to the track frame 21 of the traveling body 20 via the turning device 35. The driver's cab 32, the power chamber 33, and the counterweight 34 are mounted on the top of the frame main body 36 in that order from the front side. The power chamber 33 accommodates an engine, a hydraulic drive device, and the like. The swing device 35 is provided with a swing motor (not shown) such as a hydraulic motor, and the swing motor drives the swing body 30 to swing with respect to the traveling body 20. The front frame 37 is connected to the frame body 36 and extends in front of the frame body 36. Outriggers 38 are supported at the left and right front end portions of the front frame 37 and the left and right rear end portions of the frame body 36.

The pile driving machine 50 includes a leader 51 connected to the swivel frame 31, a placing device 52 supported by the leader 51, and a link 53 for fixing the posture of the leader 51. The link 53, together with an attachment 75, a lifting machine 70, a stopper 68, etc., which will be described later, constitutes a posture changing device for the pile driver. A backstay cylinder provided in a general pile driving machine for inclining the leader back and forth is omitted in order to secure a space at a rear portion of an upper end of the leader 51. The angle of the leader 51 during the pile driving operation can be adjusted by grounding the four outriggers 38 and adjusting the amount of expansion and contraction of the four outriggers 38 to tilt the angle of the vehicle body to the front, rear, left and right. Therefore, a swing cylinder provided in a general pile driver for tilting the leader left and right is also omitted.

The driving device 52 illustrated in the present embodiment is a rotary press-fitting type in which a pile (for example, a steel pipe) is gripped on the outer peripheral portion thereof, and the gripped pile is rotated and press-fitted onto the ground to mount the pile. However, there are also cases where another type of driving device is adopted, such as one that rotates a screw (auger) to excavate the ground. The placing device 52 is supported so as to be vertically movable with respect to the reader 51, and is vertically moved along the reader 51 by a driving device (not shown).

The leader 51 is a pillar-shaped member that supports the placing device 52 so as to be able to move up and down, and extends vertically (vertically in the figure) in the standing work posture as shown in FIG. In the present embodiment, the winch 55 is provided at a position slightly lower than the center of the reader 51 in the vertical direction, and the winch arm 56 is provided at the upper end. The leader 51 is short, and its length is set so that the upper end portion including the winch arm 56 is lower than the upper end of the operator's cab 32 when standing up. At the tip of the winch arm 56, a pulley (not shown) for hanging a wire rope (not shown) of the winch 55 is provided. When the winch arm 56 is extended forward, as shown in FIG. 1, the portion 56a accommodating the pulley projects slightly above the other portions of the winch arm 56. The winch 55 is for winding and unwinding the wire rope that is hung from the winch arm 56 via the pulley to lift a pile, an attachment 75 (FIG. 4, etc.) described later, and the like. The winch arm 56 is pivoted horizontally by a bearing 57 provided on the leader 51 about an axis extending vertically (parallel to the center line of the leader 51 in the working posture). By omitting the backstay cylinder as described above, there are no components on the line extending straight rearward from the bearing 57 to the cab 32. As a result, the winch arm 56 is configured to pivot from a posture extending forward as shown in FIG. 1 to a posture extending backward (FIG. 7 and the like). Specifically, when the state of being pointed to the rear as shown in FIG. 7 is compared with a time direction of 3 o'clock, the winch arm 56 can swivel clockwise from the direction of 3 o'clock to the direction of 11 o'clock. As a result, when the leader 51 is set in a posture in which the winch arm 56 extends rearward (FIG. 15 and the like) after the running posture described later, the pulley at the tip of the winch arm 56 (the portion 56a for storing the pulley) is located at the base of the winch arm. Is becoming lower than. In this state, the base of the winch arm 56 becomes the upper end of the pile driving machine 50, but in the present embodiment, the height thereof is approximately the same as the upper end of the cab 32. In addition, when a pile driver is loaded on a transport vehicle, it can be set within the transport height limit of a general road even in a running posture.

FIG. 2 is a side view showing a connection portion between the leader and the turning frame of the pile driver shown in FIG. The reader 51 has a bracket 58 at the rear part. The bracket 58 of the leader 51 is rotatably connected to a bracket 59 provided on the upper portion of the front frame 37 of the turning frame 31 via a shaft 61 extending in the left-right direction. A pin hole 62 is provided at the rear portion of the bracket 58. The pin hole 62 is a hole for inserting the link pin 63. At this time, the base end of the link 53 is rotatably connected to the bracket 60 provided on the upper portion of the front frame 37 of the turning frame 31 via the shaft 64 extending in the left-right direction. The shaft 64 is located slightly rearward of the trailing edge of the rotation trajectory of the pin hole 62 of the bracket 58. The link 53 is provided with a stopper 68, and the angular range in which the link 53 rotates is regulated by the stopper 68. When the link 53 tilts backward from the angle shown in FIG. 2, when it stands upright, the stopper 68 hits the bracket 60 as shown in FIG. 3, and the center of gravity of the link 53 causes the rotation fulcrum of the link 53 (center of the shaft 64). It is configured so as not to move closer to the lifting machine 70 than the lifting machine 70.

The link 53 is provided with pin holes 65 and 66 having the same diameter (see FIG. 3 for the pin hole 65). The first pin hole 65 is provided in the vicinity of the tip of the link 53, and the second pin hole 66 is provided in a bracket 67 protruding to the front part of the link 53. The distance L1 from the shaft 64 to the first pin hole 65 is set longer than the distance L2 from the shaft 64 to the second pin hole 66. The distance L1 is set so that when the link pin 63 is inserted into the pin holes 62 and 65, the leader 51 is fixed to the revolving frame 31 in a standing work posture (extends vertically). When the link pin 63 is inserted into the pin holes 62 and 66 (FIG. 15 and the like), the reader 51 is fixed to the revolving frame 31 in a running posture in which the reader 51 is tilted backward. In the traveling posture, the angle θ (FIG. 15) formed by the line connecting the front end of the ground contact portion of the traveling body 20 and the lower end of the leader 51 with the ground (for example, a horizontal plane), that is, the departure angle is about 15 degrees. Further, the distance L2 of the link 53 is configured.

Further, a post 69 is provided on a front portion of the revolving frame 31 (that is, the front frame 37) at a portion rearward of the link 53. A lifting machine 70 is supported by this post. The lifting machine 70 is of a manually driven type provided for adjusting the angle of the link 53, and the chain of the lifting machine 70 is hung on a bracket 71 provided at the rear portion of the link 53. The link 53 is undulated by hanging the chain on the bracket 71 and operating the lifting machine 70 to wind or unwind the chain.

2. Attachment FIG. 4 is a side view of the attachment provided in the pile driver according to the embodiment of the present invention, and FIG. 5 is a front view. The attitude changing system for a pile driver according to the present embodiment includes the pile driver described with reference to FIG. 1 and the like and the attachment 75 illustrated in FIG. 4 and the like, and changes from the work posture to the running posture and from the running posture to the work posture. In addition, the attachment 75 is used to change the posture of the pile driver. The attachment 75 is divided into an upper part 76 and a lower part 77. The upper part 76 is a part for gripping the attachment 75 by the driving device 52, and has, for example, a cylindrical shape having an outer diameter similar to that of a pile gripped by the driving device 52. The vertical dimension of the upper part 76 is such that it can be accommodated between the driving device 52 lowered to the bottom of the leader 51 and the winch arm 56. A pipe 78 is horizontally extended in the space inside the upper part 76, and the pipe 78 is open to the outer peripheral surface of the upper part 76. The wire of the winch 55 or a jig (not shown) for hanging the wire can be passed through the pipe 78. By lowering the placing device 52 and lifting the upper part 76 with the winch 55, the inside of the placing device 52 can be It is configured so that the upper part 76 can be inserted therein. The lower part 77 has a pair of left and right wheels 79 at the lower end. Although the height of the lower part 77 is similar to that of the upper part 76, the lower part 77 has a smaller diameter and is lighter than the upper part 76. The upper part 76 and the lower part 77 are connected by a plurality of pins 80, and a wheel 79 is provided at the lower end, and the upper part becomes an integral attachment 75 that can be gripped by the driving device 52.

3. Posture Change Method The pile driving machine according to the present embodiment is on standby, for example, at a place where a temporary foundation construction site is away from an internal commercial facility, and a trailer or the like is set according to the closing time of the commercial facility (for example, transportation). Will be transported by the transport vehicle. At this point, the pile driver is in the running posture because the transport vehicle is self-propelled and gets on and off. As shown in FIG. 6, the pile driver arriving at the commercial facility X travels on its own from the transport vehicle and then travels along the travel route Y such as a pedestrian passage through which facility users pass. When driving the pile driver, a rug is placed on the route of the pile driver so as not to damage the floor in the commercial facility. The movement route Y is a ceiling or a signboard hanging from the ceiling, and severely restricts the overall height of the pile driver in the traveling posture. There may be a slope S in the middle of the movement route Y. When the vehicle travels along the moving route Y and arrives at the foundation construction site Z provided in the commercial facility X, the posture of the pile driver is changed to the working posture. The procedure for changing the posture from the running posture to the working posture is the reverse of the procedure for changing the posture from the working posture to the running posture described later. After the pile driver is in the working posture, the outriggers 38 at the four corners of the machine body are grounded to adjust the angle of the leader 51 vertically, and the winch 55 and the driving device 52 are used to perform the pile driving work. The height of the foundation construction site Z is also restricted by the ceiling of the commercial facility and the like like the movement route Y, and the pile driving work is also carried out in the height. This stakeout work is performed from the business start time of the commercial facility to the time calculated backward considering the time required to drive the stakeout machine to the running posture again and to travel outside the commercial facility X through the movement route Y. Done.

A method for changing the attitude of the pile driver according to the present embodiment from the working attitude to the running attitude will be described with reference to FIGS. 7 to 15. 10 and 12, the driver's cab 32, the power room 33, and the counterweight 34 are omitted so that the lifting machine 70 can be seen.

At the foundation construction site Z, when the time limit for the pile driving work arrives, the pile driving work is stopped, and the posture of the pile driving machine is changed from the work posture to the traveling posture so that the pile driving work is moved along the moving route Y to leave the foundation construction site Z. To do. At this time, first, as shown in FIG. 7, the winch arm 56 is turned backward by human power, and the upper part of the attachment 75 that has been placed in the space between the left and right traveling bodies 20 after use before starting the pile driving work. Hang the wire rope on 76. Next, as shown in FIG. 8, the upper part 76 is hoisted by the winch 55, and the winch arm 56 is pivoted forward by human power to hang the upper part 76 in the driving device 52 while driving it. Raise 52. At this time, the placing device 52 is lowered in advance to a predetermined height so that the upper part 76 can be passed through the placing device 52 from above.

Then, using the wheels 79, the lower part 77 is manually transported to the lower side of the upper part 76, for example, and the driving device 52 is driven to align the upper part 76 and the lower part 77 as needed. , Both are connected as shown in FIG. After connecting the upper part 76 and the lower part 77, the orientation of the attachment 75 is adjusted so that the traveling direction of the wheels 79 is the front-rear direction, and then the upper part 76 is gripped by the driving device 52. Then, as shown in FIG. 10, the chain of the lifting machine 70 is hung on the link 53, the link pin 63 is pulled out to disconnect the link 53 and the reader 51, and the lifting machine 70 is operated to show the lifting machine 70 as shown in FIGS. 11 and 12. As described above, the link 53 is pivoted rearward to stand up. When the upper part 76 can be gripped by the driving device 52, the wire rope is removed from the upper part 76 before and after the link pin 63 is pulled out, and the winch arm 56 is inverted backward.

After releasing the connection between the link 53 and the leader 51, the placing device 52 is lowered with respect to the leader 51. Since the attachment 75 is grounded, the leader 51 tilts backward as shown in FIG. 13 while rolling the wheels 79 of the attachment 75 on the ground as the driving device 52 descends. On the other hand, while adjusting the angle of the leader 51, the angle of the link 53 is adjusted by the lifting machine 70 so that the position of the second pin hole 66 (FIG. 12) of the link 53 and the pin hole 62 (FIG. 13) of the reader 51 are adjusted. In addition, the link pin 63 is inserted into the pin holes 62 and 66 as shown in FIG. As a result, the reader 51 is fixed in the running posture by the link 53. Finally, as shown in FIG. 15, the attachment 75 is removed from the driving device 52, and the driving device 52 is lowered to lower the center of gravity as necessary, and the posture changing work to the running posture is completed. The attachment 75 can be removed by loosening the chuck of the placing device 52 while supporting the attachment 75 with a winch 55 or a dolly (not shown) with a jack.

4. Effect (1) Operability under height restriction According to the present embodiment, since the reader 51 is short and the upper end of the reader 51 is lower than the upper end of the operator's cab 32, it is higher due to the ceiling or the like inside the building such as the commercial facility X. Even at the foundation construction site Z where the space is limited, the pile driving work can be performed. Further, the attachment 75 having the wheel 79 at the lower end is gripped by the driving device 52, the link pin 63 is removed, the constraint between the link 53 and the leader 51 is released, and the driving device 52 is lowered, thereby eliminating the back stay cylinder. Also, the leader 51 can be tilted backward by itself. As a result, the posture can be efficiently changed from the work posture to the running posture even in a space where the height is limited, and the departure angle can be secured to move the slope S or the transport vehicle can travel by itself and get on and off. be able to. It is easy to change the posture from the running posture to the working posture while the height is limited. Therefore, it is possible to travel in the space where the height is limited on the ceiling, to perform the pile driving work and to change the posture of the leader 51, and to efficiently perform the pile driving work under a large space and time constraint.

In addition, even if the pile driver is loaded on the transport vehicle and kept in the running posture, it can be placed within the transport height limit on the general road, and when transporting on the general road, the posture is set to the work posture on the carrier bed No need to change. Therefore, at the time of the next work, it is not necessary to change the posture when getting off the transport vehicle, and the preparation time for traveling after arriving at the commercial facility X can be suppressed, and in this respect as well, work can be performed efficiently in a limited time. Can be progressed.

Further, since the operator is provided with the driver's cab 32 and can be operated by getting into the machine, the operability is better than, for example, a case where the pile driver is operated wirelessly and the operator operates it by standing next to the pile driver in a narrow moving route. ..

(2) Efficiency improvement of posture change work If the first link for fixing the leader 51 in the work posture and the second link for fixing the leader 51 in the running posture are separately prepared, the posture of the pile driver is changed. I have to work on link exchange every time. On the other hand, by providing the link 53 with two pin holes 65 and 66 having different distances from the shaft 64, it is possible to selectively fix the reader 51 in a working posture or a running posture by one link 53. This allows the posture changing work to be performed more efficiently. There is no need to consider storing the removed link. However, as long as the essential effect (1) is obtained, the first link and the second link may be used separately for the working posture and the traveling posture, instead of the integral link 53.

Further, in the present embodiment, the post 69 is provided on the revolving frame 31 and the lifting machine 70 is installed, which also contributes to facilitating the angle adjustment of the link 53 and improving the posture changing work. In particular, since the lifting machine 70 is of a manual drive type, fine adjustment of the operation amount is easier than that of a power type. Another advantage is that no power is required. However, the lifting machine 70 does not necessarily have to be mounted on the vehicle as long as the above effect (1) is obtained.

Further, in the case of this embodiment, the rotation range of the link 53 is limited by the stopper 68 so that the center of gravity does not come closer to the lifting machine 70 than the center of the shaft 64. As a result, the link 53 does not fall to the side of the lifting machine 70 and the angle adjustment by the lifting machine 70 becomes impossible regardless of the operation amount of the lifting machine 70. This point also contributes to improving the efficiency of posture changing work. However, the stopper 68 is not always necessary as long as the above effect (1) is obtained.

(3) Reduction in overall height of running posture Since the placing device 52 is attached to the front portion of the leader 51, if the leader 51 is tilted 90 degrees later and laid down horizontally, the placing device 52 extends upward. As a result, the overall height of the fuselage when running becomes high. In the process of changing the posture, there is a moment when the overall height of the aircraft becomes higher. Therefore, in this embodiment, the leader 51 is tilted backward so that the departure angle can be secured so that a part of the driving device 52 does not become higher than the upper end of the leader 51 during the traveling posture and the posture change. The posture is the running posture. At that time, for example, if the foundation construction site Z or the moving route Y is a station concourse, etc., the distance between the guide sign hanging from the ceiling and the driver's cab 32 is very small, and it may not be possible for a human head to enter. is there. Therefore, it is desired to lower the height of the upper end of the pile driving machine 50 tilted backward.

In this embodiment, the winch arm 56 has a portion 56a accommodating a pulley for hanging a wire rope, which is higher than other portions of the winch arm 56. In this case, if the backstay cylinder is attached to the rear portion of the leader 51, the backstay cylinder interferes and the winch arm 56 cannot be inverted backward. Therefore, when the leader 51 is tilted backward and the departure angle is secured in the state where the winch arm 56 is extended to the left and right as in a general pile driver, the portion 56a accommodating the pulley is moved to the other portion of the winch arm 56. The height of the aircraft will be high when the vehicle is in the running posture.

Therefore, in the present embodiment, the backstay cylinder is not used, and the leader 51 can be tilted by itself without relying on the backstay cylinder as described above. Creates a space without. By utilizing this space, the winch arm 56 can be inverted backward. When the leader 51 is tilted rearward with the winch arm 56 facing backward, the portion 56a accommodating the pulley becomes lower than the other portions of the winch arm 56 as shown in FIG. As a result, it is possible to reduce the overall height of the machine body in the traveling posture, as compared with a configuration in which the swing range of the winch arm 56 is limited to 90 degrees by using the back stay cylinder. However, as long as the above effect (1) is obtained, the winch arm 56 does not necessarily have to have a structure that can be inverted backward.

(4) Practicality Since the leader 51 is short, the distance between the placing device 52 lowered to the lower limit and the winch arm 56 is short, and when the attachment 75 is integrally formed, the winch 55 is used to place the attachment 75. It may not be possible to set the device 52. In the case of one body, the weight of the attachment 75 is also increased, so that it is not easy to carry it manually.

On the other hand, in this embodiment, since the attachment 75 has a two-part structure of the upper part 76 and the lower part 77, the height dimension can be suppressed in units of parts, and the upper part 76 can be set using the winch 55 which is an in-vehicle equipment. It can be inserted into the device 52. Further, since the lower part 77 is less than half the total weight of the attachment 75, it is lightweight, and since it is provided with the wheels 79, it can be moved manually. Therefore, the attachment 75 can be easily set on the placing device 52 by the procedure described above in the section "3. Posture changing method". Also, if the reader 75 is constructed using the attachment 75 and then the attachment 75 is disassembled and the lower part 77 is removed, the departure angle can be secured even when the upper part 76 is chucked by the placing device 52. .. However, as long as the above effect (1) is obtained, the attachment 75 does not necessarily have to have a divided structure.

20... Running body, 30... Revolving structure, 31... Revolving frame, 32... Driver's cab, 50... Pile driving machine, 51... Leader, 52... Placing device, 53... Link (1st link, 2nd link, integrated) Link), 55... winch, 56... winch arm, 56a... portion accommodating pulley, 61... shaft, 68... stopper, 69... post, 70... lifting machine, 75... attachment, 76... upper part, 77... lower part Parts, 79... Wheels

Claims (5)

A traveling structure, a revolving structure having a driver's cab provided above the traveling structure, and a pile driving machine connected to a revolving frame that is a base frame of the revolving structure, and the pile driving machine is provided on the left and right. A leader that is rotatably connected to the swivel frame via an extending shaft, a placing device that moves up and down along the leader, a winch that is provided on the leader, and a pulley that is provided above the leader and hangs a wire on the tip. In a pile driver equipped with a winch arm having a posture changing device for changing the posture from a working posture in which the leader stands up to a traveling posture in which the leader tilts backward, and from the traveling posture to the working posture,
The leader, the length is set so that the upper end is lower than the upper end of the cab in the work posture,
The posture changing device,
A first link connecting the leader in the working position to the swivel frame;
A second link connecting the leader in the running posture to the swing frame;
With an attachment that has wheels at the lower end and can be gripped by the driving device,
The first link and the second link that constitute the posture changing device are formed as an integral link,
A post is provided at the front of the revolving frame,
The posture changing device includes a lifting machine for adjusting an angle of the integrated link supported by the post. The pile driving machine according to claim 1 , wherein the posture changing device includes a stopper that restricts an angular range of the integral link, and a center of gravity of the integral link is higher than a rotation fulcrum of the integral link. A pile driver, which is configured to restrict movement to the side closer to the heavy equipment. 2. The pile driving machine according to claim 1, wherein the winch arm is configured to be reversible by 180 degrees from a forward extending posture to a rearward extending posture, and the leader is placed in the running posture and the winch arm is placed rearward. A pile driver, wherein the pulley at the tip of the winch arm is lower than the base of the winch arm when in the extended posture. The pile driving machine according to claim 1, wherein the attachment of the posture changing device is configured to be divided into an upper part for gripping by the driving device and a lower part having the wheel. Characteristic pile driver. A traveling structure, a revolving structure having a driver's cab provided above the traveling structure, and a pile driving machine connected to a revolving frame that is a base frame of the revolving structure, and the pile driving machine is provided on the left and right. A leader that is rotatably connected to the swivel frame via an extending shaft, a placing device that moves up and down along the leader, a winch that is provided on the leader, and a pulley that is provided above the leader and hangs a wire on the tip. A pile driving machine including a winch arm having a posture change device for changing the posture from a working posture in which the leader stands up to a traveling posture in which the leader leans backward and from the traveling posture to the working posture. hand,
The leader, the length is set so that the upper end is lower than the upper end of the cab in the work posture,
The posture changing device,
A first link connecting the leader in the working posture to the swing frame; a second link connecting the leader in the running posture to the swing frame;
With an attachment that has wheels at the lower end and can be gripped by the driving device,
The first link and the second link that constitute the posture changing device are formed as an integral link,
A post is provided at the front of the revolving frame,
The posture changing device is a posture changing method for a pile driver, comprising a lifting machine for adjusting the angle of the integral link supported by the post,
Lifting the attachment in the work posture and gripping it with the placing device;
Releasing the connection between the integrated link and the leader to lower the placing device with respect to the leader to tilt the leader backward;
Adjusting the angle of the integral link with the hoist,
Fixing the reader in the running posture by the integral link;
A method of changing the attitude of a pile driving machine, comprising the step of removing the attachment from the driving device.

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