JP2021001451A - Pile driver - Google Patents

Abstract

To provide a pile driver with a frame structure in which a front jack can be placed in a limited space of a vehicle body.SOLUTION: In a pile driver equipped with a pair of left and right front jacks provided at a front of a main frame 24, load receiving portions 38, 38 that are interposed between the main frame and the front jack (jack arm 34) and can disperse the load generated by the grounding of the front jack are provided on both sides of the front surface of a front plate 24a of the main frame. Further, the load receiving portion has a plurality of plate surfaces including a surface corresponding to the plate surface of a side plate 24b of the main frame, and is formed in a box shape. Further, the main frame is formed by having connecting members 39, 39 for connecting the front brackets, and the connecting members are fixed between the main frame and the load receiving portion.SELECTED DRAWING: Figure 6

Description

The present invention relates to a pile driver, and more particularly to a pile driver provided with a jack device for stabilization in front of and behind the upper swivel body.

Pile drivers generally include a lower traveling body provided with a crawler, an upper rotating body rotatably provided on the upper part of the lower traveling body, and a leader undulatingly provided on the front portion of the upper rotating body. By operating the engine power unit mounted on the upper swing body, the work equipment such as the auger is raised and lowered along the front of the reader, and the jack device is grounded to stabilize the vehicle body. There is. The jack device is provided with a pair of left and right jack cylinders on the front side surface and the rear side surface of the main frame located at the center in the width direction of the upper swing body. Among them, the front jack device (front jack) is provided. It has an arm with a jack cylinder attached to the tip, and improves vehicle body stability by grounding near the side surface of the leader away from the main frame (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2009-293352

In recent years, in response to increasing needs for improving the excavation capacity of pile drivers, even with models of the same class, work equipment and crawlers, which are traveling bodies, tend to become larger. In addition, in pile drivers equipped with this type of power unit, various parts tend to increase as exhaust gas regulations are tightened. Under these circumstances, the side area of the main frame to which the front jack is attached is eroded by the arrangement of other structures, and as a result, there is a problem that the arrangement of the front jack is more susceptible to design restrictions than before. there were.

Therefore, an object of the present invention is to provide a pile driver having a frame structure in which a front jack can be arranged in a limited space of a vehicle body.

In order to achieve the above object, the pile driver of the present invention includes a lower traveling body provided with a crawler, an upper rotating body provided on the upper part of the lower traveling body so as to be swivelable via a swivel bearing, and the upper swivel body. The upper swivel body is provided with a leader provided on the front portion of the body so as to be undulating via a front bracket and a working device provided so as to be able to move up and down along the front surface of the leader. In a pile driver provided with a box-shaped main frame to be attached and a pair of left and right front jacks provided at the front portion of the main frame, the main frame and the front are provided on both front sides of the main frame. It is characterized in that a load receiving portion is provided which is interposed between the jack and can disperse the load generated when the front jack is grounded.

Further, the load receiving portion is characterized in that it has a plurality of plate surfaces including a surface corresponding to a side surface of the main frame and is formed in a box shape, and further, the main frame has the front bracket. It is formed with a connecting member for connecting, and the connecting member is characterized in that the main frame and the load receiving portion are fixed to each other.

According to the present invention, since the load receiving portions capable of distributing the load generated by the grounding of the front jack are provided on both sides of the front surface of the main frame, the frame mounting portion of the front jack corresponds to the load receiving portion. It can be provided at the position, that is, in front of the front position of the main frame to ensure the stability and strength of the vehicle body in the pile driving work. Thereby, even if the side area of the main frame is eroded by the arrangement of other structures, the front jack can be provided on the main frame without impairing its supporting function. Moreover, since the load receiving portions are located on both sides of the front surface of the main frame, there is no inconvenience such as hindering the forward tilting operation of the leader, and the vehicle body is compactly formed by maintaining the positional relationship between the leader and the main frame. be able to.

Further, since the load receiving portion has a plurality of plate surfaces including a surface corresponding to the side surface of the main frame and is formed in a box shape, a frame structure having a load receiving portion that is inexpensive and has good manufacturability can be obtained. .. In particular, since the load receiving portion does not protrude in the width direction of the main frame, the process of moving on the line and performing various machining on the line is smooth before welding the jack at the time of manufacturing the main frame. This can be done, and productivity can be improved by shortening the lead time.

Further, the box-shaped structure of the load receiving portion makes it possible to effectively disperse the load generated by receiving the ground reaction force of the front jack. In addition to this, the load receiving parts corresponding to the left and right sides of the front jack are connected to each other via the front surface of the main frame, so that an integrated structure that is lightweight but resistant to bending and twisting loads can be achieved. The durability of the frame can be improved.

It is a side view of the pile driver which shows one embodiment of this invention. It is also a side view of the base machine. It is also a plan view of the base machine. It is also a front view of the base machine. It is also a side view of the main part of the main frame. It is also a plan view of the main part of the main frame. It is also a front view of the main part of the main frame. It is also a perspective view of a main part of the main frame.

1 to 8 show an example of one form of the pile driver of the present invention. As shown in FIG. 1, the pile driver 11 is composed of a lower traveling body 12 provided with a crawler 12a and an upper rotating body 14 provided on the upper portion of the lower traveling body 12 so as to be swivelable via a swivel bearing 13. A base machine, a front bracket 15 provided on the front portion of the upper swing body 14 so as to be swingable in the front-rear direction, and a leader 16 provided on the tip of the front bracket 15 so as to be undulating in the front-rear direction. A pair of left and right back stays 17 and 17 that support the leader 16 standing upright from the rear side of the upper swing body 14 and a leader 16 that is tilted backward in the transport posture are supported from below on the rear side of the upper swing body 14. It is provided with a rear support cylinder 18. Further, a counterweight 19 for stabilization is mounted on the rear end portion of the upper swing body 14.

On the front side of the leader 16, a pair of left and right guide pipes 20 and 20 provided parallel to the longitudinal direction of the leader 16 and the outer surface side of each guide pipe 20 and 20 in the vehicle body width direction are slidably held. It is provided with an auger 22 which is an example of a working device provided so as to be able to move up and down along the front surface of the reader 16 via a plurality of guide gives 21. Then, in the working posture in which the leader 16 is erected in the vertical direction (FIG. 1), the auger 22 holds the construction members such as the steel pipe pile and the screw rod 23, and the leader 16 is buried in the ground while rotating. Pile construction is done. On the other hand, in the transport posture (not shown) in which the leader 16 is laid down in the horizontal direction, the reduced backstay cylinder 17a and the rear support cylinder 18 are laid down on the upper swing body 14 together with the leader 16 whose upper side is separated. It is designed to be mounted on the loading platform of a transport vehicle as it is.

As shown in FIGS. 2 to 4, the upper swing body 14 has a rectangular box-shaped main frame 24 to which a swing bearing 13 is attached to the lower surface, and reinforcing members on both sides of the main frame 24 in the vehicle width direction. It is provided with framed floor frames 25 and 26, and various large parts are mainly mounted on the main frame 24. Further, jack devices for stabilization are provided at four locations in the front, rear, left and right of the main frame 24. Specifically, a pair of left and right front jacks 27 and 27 are provided at the front end and a pair of left and right rear jacks 28 and 28 are provided at the rear end on both sides of the floor frames 25 and 26 in the front-rear direction. By extending the jack cylinders 27b and 28b provided with the ground plates 27a and 28a, the vehicle body can be stably supported.

A driver's cab 29 for driving the auger 22, the upper swing body 14, the lower traveling body 12, and the like is installed in the front part on the floor frame 26 on the right side, and in the central part on the main frame 24. , The winch mounting unit 30 is provided, and a plurality of winch devices such as a winch device for raising and lowering an auger are mounted. A rope (not shown) from the winch device for raising and lowering the auger is connected to the auger 22 via a top sheave block 31 provided on the top of the reader 16 (FIG. 1), and the auger 22 is lifted and lowered by operating the winch. Can be made to.

Further, an equipment storage house 32 for accommodating hydraulic equipment (not shown) such as a hydraulic oil tank and a hydraulic motor is provided at the rear portion on the floor frame 26 on the right side. On the other hand, on the floor frame 25 on the left side, as a hydraulic source device for supplying pressure oil by being driven by an engine, a power unit, a fuel tank attached thereto, an exhaust gas purification device, and a plurality of related devices (FIG. An engine storage house 33 for storing (not shown) is provided. Further, each of the houses 32 and 33 is provided with an elevating ladder 33a and a plurality of inspection doors 33b (the opposite side is not shown).

By the way, the mounting position of the jack device provided in this type of pile driver 11 is considered so as not to interfere with the crawler 12a which is a traveling body even when the upper swivel body 14 is swiveled all around. .. In addition to this, the jack device is required to have a function of more stably supporting the vehicle body during the construction of piles. Therefore, the front jack 27 is provided with a jack arm 34 capable of grounding the jack cylinder 27b near the side surface of the reader 16. Here, as described above, since many devices such as a power unit and an exhaust gas purification device are mounted on the vehicle body, the external dimensions of the floor frames 25 and 26 are increased in the front-rear direction. Along with this, the side surface area of the main frame 24 to which the front jack 27 is attached is eroded by the front ends of the floor frames 25 and 26, and the area thereof is reduced.

Therefore, in order to enable the arrangement of the front jacks 27 in the limited space of the vehicle body, the front jacks 27 are interposed between the main frame 24 and the front jacks 27, 27 on both front sides of the main frame 24. Load receiving portions 38 and 38, which will be described later, are provided to disperse the load generated by the grounding of the front jacks 27 and 27 (FIG. 4), and the frame mounting portions of the front jacks 27 and 27 correspond to the load receiving portions 38 and 38. The front jacks 27 and 27 are provided at both corners of the front end of the main frame 24, which is the position where the main frame 24 is set, that is, at a front position so as not to interfere with the front ends of the floor frames 25 and 26 (FIGS. 2 and 3).

In the front jack 27, the jack arm 34 having the rectangular opening-shaped frame mounting portion 34a basically has a cross-sectional dimension of a required height and width so as to withstand bending and twisting loads due to the ground reaction force of the jack. It is formed in a rectangular cylinder shape, and the base end portion (frame mounting portion 34a) is fixed by aligning the lower surface of the frame on the front side surface of the main frame 24 with a reference height, and extends while being curved forward. At the same time, it has a shape that gradually narrows, and a jack cylinder 27b is attached to the tip portion. Further, the jack arm 34 is provided with a flange 35 to which bolts are fastened at an intermediate position, and the arm portion 37 on the tip side is separated from the shoulder portion 36 on the base end side with the mating surface of the flange 35 as a boundary. Can be combined.

As shown in FIGS. 5 to 8, the load receiving portion 38 has a box-shaped structure symmetrically provided on both front side portions of the front plate 24a of the main frame 24, and corresponds to the front half of the frame mounting portion 34a. The outer plate 38a, the inner plate 38b inclined toward the front outer side, the front plate 38c parallel to the plate surface of the front plate 24a of the main frame 24, and the upper and lower plates corresponding to the height dimension of the frame mounting portion 34a. It is formed with an upper plate 38d and a lower plate 38e having a set interval. Further, in the load receiving portion 38, the outer plate 38a is the side plate 24b of the main frame 24 and the lower plate 38e is the lower plate 24c of the main frame 24 so that the plate surfaces are aligned with the front end corners of the main frame 24. It is formed integrally.

Further, a pair of left and right connecting members (boss plates) 39 for connecting the front bracket 15 to the stepped portion generated by the height difference between the upper plate 38d of the load receiving portion 38 and the upper plate 24d of the main frame 24, 39 is welded. As a result, the connecting member 39 is firmly fixed between the main frame 24 and the load receiving portion 38, and is located directly above the upper plate 38d and in front of the front plate 24a of the main frame 24. By inserting the connecting pin 40 through the tubular boss 39a, the front bracket 15 can swing in the front-rear direction around the axis of the connecting pin 40 (FIG. 2).

As described above, since the load receiving portions 38 capable of distributing the load generated by the grounding of the front jack 27 are provided on both front side portions of the main frame 24, the frame mounting portions 34a of the front jack 27 are used as the load receiving portions. By providing the position corresponding to 38, that is, in front of the front position of the main frame 24, the stability and strength of the vehicle body in the pile driving operation can be ensured. Thereby, even if the side surface region of the main frame 24 is eroded by the arrangement of other structures, the front jack 27 can be provided on the main frame 24 without impairing its supporting function. Moreover, since the load receiving portions 38 are located on both sides of the front surface of the main frame 24, there is no inconvenience of hindering the forward tilting operation of the reader 16, and the leader 16 and the main frame 24 are kept in a compact position with each other. The car body can be formed.

Further, since the load receiving portion 38 has a plurality of plate surfaces including a surface corresponding to the plate surface of the side plate 24b of the main frame 24 and is formed in a box shape, the load receiving portion 38 is inexpensive and has good manufacturability. A complete frame structure can be obtained. In particular, since the load receiving portion 38 does not protrude in the width direction of the main frame 24, movement on the line and various machining on the line are performed in the stage before welding the jack arm 34 at the time of manufacturing the main frame 24. The process of performing welding can be performed smoothly, and productivity can be improved by shortening the lead time.

Further, the box-shaped structure of the load receiving portion 38 makes it possible to effectively disperse the load generated by receiving the ground reaction force of the front jack 27. In addition to this, the load receiving portions 38, 38 corresponding to the left and right sides of the front jack 27 are connected to each other via the front plate 24a of the main frame 24, so that they are lightweight but resistant to bending and twisting loads. An integrated structure can be achieved, and the durability of the main frame 24 can be improved.

Further, since the connecting member 39 connecting the front bracket 15 is fixed between the main frame 24 and the load receiving portion 38, the load receiving portion 38 can be downsized while maintaining its strength. Therefore, it becomes easy to determine the shape of the load receiving portion 38 so as to correspond to the shape of the frame mounting portion 34a. Further, since the boss 39a provided on the connecting member 39 is directly above the upper plate 38d of the load receiving portion 38 and located in front of the front plate 24a of the main frame 24, the boss 39a is located via the connecting pin 40. It is possible to reduce the load that acts on the surface, and the optimum design can be performed comprehensively.

Further, since the jack arm 34 is provided with the flange 35 bolted at the intermediate position, the frame mounting portion 34a can be simply formed to improve the manufacturability. Moreover, since the arm portion 37 can be separated from the shoulder portion 36 with the mating surface of the flange 35 as a boundary, not only is there an advantage of excellent maintainability, but also the front jack 27 is intentionally removed. It is possible to respond to a special usage mode such as performing construction, and it is possible to realize a pile driver 11 having high practical value.

In this embodiment, the load receiving portion has a box-shaped structure, but the structure is not limited to this, and a thick plate material may be laminated and welded, and the left and right load receiving portions are formed of a single member. You may. Further, the height position of the upper plate of the load receiving portion may be aligned with the height position of the upper plate of the main frame, and it can be appropriately formed according to various conditions such as a space for attaching the front bracket. That is, the shape of the load receiving portion can be arbitrarily formed in consideration of the manufacturing cost, the yield, and the like, as long as the load due to the jack contact can be received at the front end corner portion of the main frame.

11 ... Pile driving machine, 12 ... Lower traveling body, 12a ... Crawler, 13 ... Swivel bearing, 14 ... Upper swivel body, 15 ... Front bracket, 16 ... Leader, 17 ... Back stay, 17a ... Back stay cylinder, 18 ... Rear Support cylinder, 19 ... counter weight, 20 ... guide pipe, 21 ... guide give, 22 ... auger, 23 ... screw rod, 24 ... main frame, 24a ... front plate, 24b ... side plate, 24c ... lower plate, 24d ... upper plate, 25, 26 ... Floor frame, 27 ... Front jack, 27a ... Ground plate, 27b ... Jack cylinder, 28 ... Rear jack, 28a ... Ground plate, 28b ... Jack cylinder, 29 ... Driver's cab, 30 ... Winch mounting part, 31 ... Top sheave block, 32 ... Equipment storage house, 33 ... Engine storage house, 33a ... Elevating ladder, 33b ... Inspection door, 34 ... Jack arm, 34a ... Frame mounting part, 35 ... Flange, 36 ... Shoulder part, 37 ... Arm part , 38 ... load receiving part, 38a ... outer plate, 38b ... inner plate, 38c ... front plate, 38d ... upper plate, 38e ... lower plate, 39 ... connecting member, 39a ... boss, 40 ... connecting pin

Claims (3)

A lower traveling body provided with a crawler, an upper swinging body provided on the upper part of the lower traveling body so as to be swivel via a swivel bearing, and an upper swivel body provided on the front portion of the upper swivel body so as to be undulating via a front bracket. The upper swivel body includes a box-shaped main frame on which the swivel bearing is attached to the lower surface, and a front portion of the main frame, which comprises a leader and a working device provided so as to be able to move up and down along the front surface of the reader. In a pile driver equipped with a pair of left and right front jacks provided in
Both sides of the front surface of the main frame are provided with load receiving portions interposed between the main frame and the front jack and capable of distributing the load generated by the grounding of the front jack. Pile driver to do. The pile driver according to claim 1, wherein the load receiving portion has a plurality of plate surfaces including a surface corresponding to a side surface of the main frame and is formed in a box shape. The main frame is formed by having a connecting member for connecting the front bracket, and the connecting member is fixed between the main frame and the load receiving portion. The pile driver according to claim 1 or 2.

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