JP7287882B2 - Piling machine and how to use the piling machine - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile driver, and more particularly to a pile driver provided with a pipe guide arm for movably supporting a pipe connected to a working device, and a method of using the pile driver.

A piling machine is generally equipped with a working device such as an auger that can move up and down with respect to a leader erected in front of a base machine. Normally, a working device is connected to pipes such as hydraulic hoses and electrical cables, and changes its position in accordance with the up-and-down motion of the working device. It is necessary to prevent such long pipes, which have a large degree of freedom of movement, from getting caught in the work equipment. (See Patent Document 1, for example). In addition, with the diversification of sites where pile drivers are used, the leader can be disassembled into a plurality of leader members, and the length of the leader can be changed from a long leader (standard leader) to a short leader, or vice versa. There is known a small pile driver that can be used not only at a normal construction site but also at a place with a height restriction such as under a bridge or in a factory by rearranging it (see, for example, Patent Document 2).

Japanese Patent No. 3105487 JP 2007-182716 A

If the above-mentioned piping and piping guide arm are set to the maximum length that can correspond to the specifications of the long reader, the trouble of replacing them every time the specifications are changed can be eliminated and the handling becomes easy. On the other hand, when changing from a long leader to a short leader, it is necessary to lower the total height by tilting the pipe guide arm rearward from the standing state along the leader. However, if the pipe guide arm is tilted, the support interval (span) of the pipes will widen greatly in the front-rear direction. As a result, the unconstrained portion (loose portion) of the pipes in the connected state comes into contact with the vehicle body as the work equipment descends, and is rubbed and worn, or is forcibly bent. was there. If the working device is repeatedly moved up and down in such a situation, the deterioration of the pipe will progress, and in the worst case, there is a risk that the pipe will break.

Accordingly, the present invention provides a pile driver equipped with a pipe receiver capable of improving the durability of the pipe by avoiding contact between the pipe connected to the working device and the car body, and a method of using the pile driver. It is intended to

In order to achieve the above object, the pile driver of the present invention comprises a base machine in which an upper revolving body is rotatably provided on an upper part of a lower traveling body, and a leader which is provided in a front part of the upper revolving body so as to be able to rise and fall. and a work device that can be raised and lowered along the front surface of the leader, the work device being connected to the upper revolving body by piping, and the upper revolving body being connected to the upper revolving body by the piping behind the leader. , wherein the pipe is provided in a restrained state along the pipe guide arm from the upper rotating body, and is unrestrained from the tip of the pipe guide arm It is characterized in that the pipe guide arm, which is connected to the work device, has a pipe receiver that receives the pipe that moves downward as the work device descends.

Further, the pipe receiver is formed to have an arc contact surface with which the pipe can contact, and the radius of the arc contact surface is larger than the minimum allowable bending radius of the pipe. It is characterized by Further, the circular arc contact surface is characterized by comprising the outer peripheral surface of a rotatably supported roller. In addition, the pipe receiver is characterized by comprising a fall-off preventing portion for preventing the pipe from falling off.

Further, the method of using the pile driver of the present invention comprises a base machine in which an upper revolving body is rotatably provided on an upper part of a lower traveling body, a leader which is provided in front of the upper revolving body so as to be able to rise and fall, and a work device capable of moving up and down along the front surface of the leader, the work device being connected to the upper revolving body by a pipe, and the upper revolving body supporting the pipe behind the leader. In the pile driver, a plurality of leader members are detachably connected to each other, and the leader members are rearranged to form a large number of long leader members. The piping can be changed to a specification or a short specification consisting of a small number of pipes. In a method for using a pile driver, wherein the pipe guide arm is connected to a device and includes a pipe receiver for receiving the pipe that moves downward following the descent of the work device, the leader member is rearranged so that the leader length is changing the length from the long specification to the short specification; holding the pipe guide arm at an elevation angle corresponding to the short specification; abutting on the front of the lowermost portion of the slack of the piping.

According to the present invention, since the pipe guide arm arranged on the upper revolving body of the pile driver is provided with the pipe receiver that receives the pipe that moves downward following the descent of the work device, the pipe can be It is possible to avoid contact with the vehicle body, and it is possible to effectively protect the piping that moves in the vertical direction from damage. In addition, when the leader length is changed to a short specification and the pipe guide arm is tilted, the pipe holder and the pipe are brought into contact with each other in front of the lowermost part of the slack of the pipe. Gravity smoothly permits the backward movement (escape) of the pipe accompanying the descent of the pipe. As a result, it is possible to avoid excessive bending of the pipe on the rear surface side of the working device, thereby improving the durability of the pipe.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view of the pile driver (long specification leader) which shows the 1st form example of this invention. It is also a front view. It is also a plan view. It is a side view of the main part of the same. Similarly, it is a front view of a main part. It is a plan view of the main part of the same. FIG. 10 is a diagram showing a state in which an auger attached to a short specification (4-connected) reader is held at a limit position for ascent. It is a figure which shows the state which similarly lowered an auger to the position in the middle of an operation|movement. It is a figure which shows the state which similarly lowered the auger to the descent limit position. FIG. 10 is a diagram showing a state in which an auger attached to a short specification (three-connected) leader is held at the upper limit position; It is a figure which shows the state which similarly lowered the auger to the descent limit position. FIG. 10 is a diagram showing a state in which an auger attached to a short specification (two-connected) leader is lowered to a lowering limit position; It is a principal part side view of the pile driver which shows the example of a 2nd form of this invention. Similarly, it is a front view of a main part. It is a plan view of the main part of the same. FIG. 10 is a diagram showing a state in which the auger attached to the short specification (three-connected) leader in the second embodiment is lowered to a mid-operation position;

1 to 12 are diagrams showing a pile driver and a method of using the pile driver in the first embodiment of the present invention. As shown in FIGS. 1 to 3, the pile driver 11 is a base composed of a lower traveling body 12 having crawlers 12a and an upper revolving body 13 rotatably provided on the lower traveling body 12. It comprises a machine 14, a leader 15 erected on the front part of the upper revolving body 13, and a leader hoisting cylinder 16 supporting the leader 15 from behind. A front bracket 17 is provided at the front of the upper rotating body 13 to support the leader 15 so that the leader 15 can be raised and lowered. A pipe guide arm 19 is provided for supporting a plurality of pipes 18 . Further, an operator's cab 20 is provided on the right side of the upper revolving body 13, and a house 21 containing an engine and a hydraulic unit is provided on the left side thereof. Jack cylinders 22 are provided at four locations on the front, rear, right, and left sides of the upper revolving body 13 , and a counterweight 23 for balancing the base machine 14 is mounted at the rear end of the upper revolving body 13 .

The leader 15 is formed by detachably connecting a plurality of leader members each having a rectangular tubular cross section, and is rotatably attached to a support shaft 24 provided on the front bracket 17 in the width direction of the vehicle body. It is divided into a lower reader 25, an intermediate reader 26 connected to the upper part of the lower reader 25, and an upper reader 27 connected to the upper part of the intermediate reader 26, and the lower leader 25 is a lower first member. 25a and a lower second member 25b, the intermediate leader 26 is divided into an intermediate first member 26a and an intermediate second member 26b, and the upper leader 27 is an upper first member 27a and an upper second member. 27b and an upper third member 27c.

Each leader member is formed with a flanged connection 28 at adjacent portions which is stably connected by a plurality of bolts and nuts. Further, each flange joint portion 28 is formed so that the bolt hole size and arrangement pitch are all common. 27 has a long specification (FIG. 1) composed of three members, a first upper member 27a, a second upper member 27b, and a third upper member 27c, and a small number of leader members, for example, the upper leader 27 is replaced by an intermediate leader 26. , or a short specification in which the intermediate reader 26 is separated from the lower reader 25 and further shortened.

A top sheave block 31 around which a wire rope 30 drawn out from a winch device 29 is wound is arranged on the upper end of the upper leader 27, and a detachable anti-vibration member 32 is arranged in front of the lower part of the lower leader 25. At the front center of the leader 15 is a rack member 33, which is one of the components of the rack and pinion lifting device. are continuously provided throughout.

An auger 35, which is an example of a working device, is provided with a pair of left and right guide gibs 35a that are in sliding contact with the guide pipe 34 and protrude rearward. The pinion is driven to rotate by the auger lifting hydraulic motor 35b to move up and down along the front surface of the leader 15. As shown in FIG. When using this pile driver 11 at a construction site, for example, a steel pipe pile is used as a construction member. A steel pipe pile (not shown) is connected to the rotating shaft of the speed reduction mechanism 35c via a cap rod 36, and is driven by an auger driving hydraulic motor 35d to lower the auger 35 while rotating the cap rod 36. pressed into the ground by

The piping guide arm 19 includes a base member 37 bent from the outer surface of the front bracket 17 and extending upward, an arm body 38 pivotally supported so as to be tiltable in the front-rear direction along the piping 18, and a base member. 37 and an arm hoisting cylinder 39 straddled between the arm 37 and the arm body 38. By extending and contracting the arm hoisting cylinder 39, the arm body 38 is held vertically (FIG. 1) in an upright position and horizontally. It is configured to be able to rise and fall between the lodging position.

The arm body 38 has a substantially U-shaped cross section with an open bottom side, and a guide surface (upper surface) 38a has a plurality of fixing bands 38b arranged at predetermined intervals and is restrained by the fixing bands 38b. A metal pipe 38c for connecting the pipe 18 is provided. The base of the pipe 18 is connected to a centralized connector 13a provided on the upper revolving body (frame side) 13 and guided along the arm main body 38 in a restrained state. , and is connected to a centralized connector 35e provided on the auger 35 in an unrestrained state. The pipe 18 from the arm body 38 to the auger 35 is movable in the vertical direction following the up-and-down motion of the auger 35, and its length is set to match the specifications of the long reader. That is, the length is set so that the auger 35 can sufficiently reach the upper portion (upper limit position) and the lower portion (lower limit position) of the leader 15 while the arm body 38 is held in the upright position.

By the way, when the pile driver 11 performs pile driving work in a place such as a building where the height is restricted, the leader 15 is rearranged from the standard long specification to the short specification. A certain piping guide arm 19 is held at an undulating angle corresponding to the short specification by tilting the arm body 38 backward, and the tip thereof is kept lower than the height of the leader 15, that is, the total height. However, when the arm body 38 is tilted, the support interval (span) of the pipe 18 widens greatly in the longitudinal direction. , for example, the problem of contact with the stairs (edge portion) 21a of the house 21 occurs. Therefore, the pipe guide arm 19 is provided with a pipe receiver 40 that receives the pipe 18 that moves downward following the descent of the auger 35 .

The pipe receiver 40 has a half-cylindrical structure housed inside the outer surface of the upper revolving body 13, and is cantilevered on the outer surface of the base end of the arm body 38 as shown in FIGS. In this state, the position (top) that bisects the circular arc member 40a in the circumferential direction is aligned on the same plane as the guide surface 38a of the arm body 38, and one circumferential end (lower end) of the arm body 38 rotates. It is arranged close to the driving shaft 41 . As a result, the position of the arm body 38 does not move significantly in the front-rear direction within the range of rotation of the arm body 38, and the pipe 18 can be received softly by the arc member 40a.

The circular arc member 40a has both ends in the circumferential direction rounded by a pair of round pipes 40b, 40b, and has an arc contact surface 40c on the outer peripheral surface with which the pipe 18 can contact in the circumferential direction. On the other hand, a mounting bracket 40d is provided extending in the width direction on the inner peripheral surface opposite to the arc contact surface 40c. Also, the radius of the arc contact surface 40 c is formed larger than the minimum allowable bending radius of the pipe 18 . The minimum allowable bend radius is the smallest radius to which the pipe can be bent without being damaged, thereby preventing permanent deformation of pipe 18 . Further, on the outer edge of the circular arc member 40a, a plate 40e having a half-split annular shape and a substantially U-shaped plate 40e that connect both ends of the plate 40e in the circumferential direction are provided as a drop-off preventing portion for preventing the pipe 18 from dropping off. A round bar 40f is provided.

In the pile driver 11 formed in this way, when the leader 15 is changed from the long specification to the short specification and construction is performed, for example, all the leader members of the upper leader 27 are removed and the pile driver 11 is shown in FIGS. , the leader members 25a, 25b, 26a and 26b of the lower leader 25 and the intermediate leader 26 are connected to each other. Further, by tilting the arm body 38 rearward, the piping guide arm 19 is kept at an elevation angle of approximately 45 degrees, and is kept as low as the height of the leader 15 . At this time, as shown in FIG. 7, the auger 35 is held at the upper limit position, and the loose portion of the pipe 18 is positioned above the house 21 in an unrestrained state.

When the auger 35 is lowered from the upper limit position, as shown in FIG. 8, the pipe receiver 40 and the pipe 18 come into contact with each other in front of the lowermost portion L of the slack of the pipe 18 at an intermediate position during operation. be. When the auger 35 is further lowered from this state, the pipe 18 is gently bent along the arc contact surface 40c of the pipe receiver 40, and the pipe 18 itself slides on the arc contact surface 40c due to its own weight. Move backward a predetermined amount. As a result, as shown in FIG. 9, the pipe 18 hangs down in a wavy pattern between the auger 35 and the pipe guide arm 19 at the lower limit position of the auger 35. Holds without contact.

10 and 11, the leader 15 is constructed by connecting three members 25a, 25b and 26a of a lower leader 25 and an intermediate leader 26. The piping guide arm 19 has an elevation angle of approximately 25 degrees. held. Further, as shown in FIG. 10 , the pipe 18 has a slackened portion in the unrestrained state at the upper limit position of the auger 35 , and extends in a wide front-rear direction. When the auger 35 is lowered from this state, the pipe receiver 40 and the pipe 18 are brought into contact with each other in front of the lowermost portion L of the slack of the pipe 18, and the same as the short specification (4 connections) described above, the pipe The pipe 18 is gently bent along the arcuate contact surface 40c of the receiver 40, and moves backward by a predetermined amount while sliding on the arcuate contact surface 40c due to the action of the own weight of the pipe 18 itself. As a result, as shown in FIG. 11, the pipe 18 hangs down in a wavy pattern between the auger 35 and the pipe guide arm 19 at the lower limit position of the auger 35, and the structure of the house 21 and its surroundings is suspended. Holds without contact.

12 shows that the leader 15 is composed of two connected leader members 25a and 25b of the lower leader 25. The pipe guide arm 19 is set at a 0 degree elevation angle, that is, when the arm main body 38 is horizontal. held in position. In this case, since the movement range of the auger 35 is limited to a narrow range near the ground, the pipe 18 is always held in a state of being received by the pipe receiver 40 . Even in this state, the pipe 18 hangs down in a wavy pattern between the auger 35 and the pipe guide arm 19 at the lower limit position of the auger 35, and is held without coming into contact with the house 21 and surrounding structures. be done.

Thus, since the pipe guide arm 19 arranged on the upper revolving body 13 of the pile driver 11 is provided with the pipe receiver 40 that receives the pipe 18 that moves downward following the descent of the auger 35, the pile driving work is carried out. Moreover, contact between the pipe 18 and the vehicle body can be avoided, and the pipe 18, which has a large amount of vertical movement, can be effectively protected from damage. Also, when the leader length is changed to a short specification and the pipe guide arm 19 is tilted, the pipe receiver 40 and the pipe 18 are brought into contact with each other in front of the lowermost part of the slack of the pipe 18. Therefore, the rearward movement (escape) of the pipe 18 accompanying the descent of the auger 35 is smoothly allowed by gravity. As a result, the pipe 18 can be prevented from being excessively bent on the rear side of the auger 35, and the durability of the pipe 18 can be improved.

Furthermore, since the pipe receiver 40 has the arc contact surface 40c, relative movement between the pipe 18 and the arc contact surface 40c can be easily and smoothly permitted. In addition, since the radius of the arc contact surface 40c is made larger than the minimum allowable bending radius of the pipe 18, the pipe 18, which is prone to bending deformation, can be effectively protected. In addition, since the pipe 18 is prevented from falling out from the pipe receiver 40 by the fall-off preventing portion combining the plate 40e and the round bar 40f, the long and moving pipe 18 can be reliably protected.

13 to 16 show a pile driver and a method of using the pile driver in the second embodiment of the present invention. In the following description, the same reference numerals are assigned to the same components as those shown in the first embodiment, and detailed description thereof will be omitted.

In this embodiment, a pipe receiver 50 having mounting compatibility with the pipe guide arm 19 with respect to the pipe receiver 40 of the first embodiment, and a roller 50a capable of rotating a portion corresponding to the arc member 40a. It is a receiving structure by

As shown in FIGS. 13 to 15, the pipe receiver 50 is cantilevered on the outer surface of the base end of the arm body 38, and basically consists of a pair of pipe holders arranged at a predetermined interval in the longitudinal direction of the arm body 38. It has rollers 50a, 50a and a substantially H-shaped frame 50c that rotatably supports them with a pair of support shafts 50b, 50b. It is sized to fit inside.

The rollers 50a, 50a have the same shape, and have circular contact surfaces 50d, 50d on their outer peripheral surfaces, respectively, with which the pipe 18 can come into contact in the circumferential direction. The rollers 50 a on the base end side of the arm are arranged close to the rotating shaft 41 of the arm body 38 . As a result, the position of the arm main body 38 does not move significantly in the front-rear direction within the range of rotation of the arm main body 38, and the pipe 18 can be received softly by the rollers 50a, 50a. A substantially U-shaped round bar 50e is provided on the outer edge of the frame 50c as a drop-off preventing portion for preventing the pipe 18 from dropping off.

When the pile driver 11 formed in this manner performs construction with a short leader length, for example, as shown in FIG. , 26a, and the hoisting angle of the pipe guide arm 19 is maintained at approximately 25 degrees. In addition, the pipe 18 has a slack portion in an unrestrained state at the upper limit position of the auger 35, and extends in the front-rear direction. When the auger 35 is lowered from this state, the pipe receiver 50 and the pipe 18 are brought into contact with each other in front of the slack lowermost portion L of the pipe 18, and the pipe 18 is moved along the contact surface 50d of the pipe receiver 50. is gently bent, and the pipe 18 itself moves backward by a predetermined amount while being in contact with the contact surface 50d due to the action of its own weight. As a result, the pipe 18 hangs down in a wavy pattern between the auger 35 and the pipe guide arm 19 at the lower limit position of the auger 35, and is held without coming into contact with the house 21 and surrounding structures. It's like

As described above, the pipe guide arm 19 arranged on the upper revolving body 13 of the pile driver 11 is provided with the pipe receiver 50 for receiving the pipe 18 that moves downward as the auger 35 descends. Similar to the embodiment, it is possible to effectively protect the pipe 18, which has a large amount of movement in the vertical direction, from being damaged. In particular, since the contact surface 50d is formed of the outer peripheral surface of the rotatably supported roller 50a, friction between the pipe 18 and the contact surface 50d is eliminated, and smooth movement of the pipe 18 is realized, further extending the life of the pipe. It contributes to prolongation.

It should be noted that the present invention is not limited to the above-described embodiments, and the pipe holder may have any structure as long as it can stably receive the pipe without forcibly bending it. It can be formed by bending, or by arranging a plurality of round pipes, round bars, rollers, etc. in an arc shape. In addition, the installation of the pipe receiver is not limited to one place as long as the distance between the pipe and the vehicle body can be secured so that the pipe does not come into contact with the vehicle body. The arrangement can be appropriately changed in consideration of the amount of movement of the piping, such as providing it in a structure.

In particular, by providing the pipe receiver at the base end of the pipe guide arm, it is possible to reliably prevent contact between the pipe and the house (stairs) even when the pipe guide arm is tilted horizontally during construction. In addition, even when the auger is separated from the car body and transported separately after construction, the pipe section disconnected from the auger is compactly gathered in the lower position of the pipe receiver, making it easy to handle. In addition, the fall-off preventing portion prevents the pipe from falling off from the pipe holder, contributing to transportation safety.

DESCRIPTION OF SYMBOLS 11... Piling machine, 12... Lower traveling body, 12a... Crawler, 13... Upper rotating body, 13a... Centralized connector, 14... Base machine, 15... Leader, 16... Leader hoisting cylinder, 17... Front bracket, 18... Piping , 19... Piping guide arm, 20... Driver's cab, 21... House, 21a... Stairs, 22... Jack cylinder, 23... Counterweight, 24... Support shaft, 25... Lower leader, 25a... Lower first member, 25b... Lower part Second member 26 Intermediate leader 26a First intermediate member 26b Second intermediate member 27 Upper leader 27a First upper member 27b Second upper member 27c Third upper member 28 ... Flange connection part 29 ... Winch device 30 ... Wire rope 31 ... Top sheave block 32 ... Anti-vibration member 33 ... Rack member 34 ... Guide pipe 35 ... Auger 35a ... Guide gib 35b ... Auger lifting Hydraulic motor 35c... Reduction mechanism 35d... Hydraulic motor for driving auger 35e... Centralized connector 36... Cap rod 37... Base member 38... Arm main body 38a... Guide surface 38b... Fixed band 38c... Metal pipe , 39... Arm hoisting cylinder 40... Pipe holder 40a... Circular member 40b... Round pipe 40c... Circular contact surface 40d... Mounting bracket 40e... Plate 40f... Round bar 41... Rotating shaft 50 Pipe receiver 50a Roller 50b Spindle 50c Frame 50d Arc contact surface 50e Round bar

Claims (6)

A base machine having an upper revolving body rotatably provided on an upper part of a lower traveling body, a leader provided at the front part of the upper revolving body so as to be able to rise and fall, and a working device capable of moving up and down along the front surface of the leader. The work device is connected to the upper revolving body by a pipe, and the upper revolving body is provided with a pipe guide arm that can be raised and lowered for supporting the pipe behind the leader. in
the pipe is provided in a constrained state along the pipe guide arm from the upper rotating body, and is connected to the working device from the tip of the pipe guide arm without constraint;
The pile driver, wherein the pipe guide arm includes a pipe receiver that receives the pipe that moves downward as the work device descends. 2. The pile driver according to claim 1, wherein said pipe receiver is formed to have an arc contact surface with which said pipe can come into contact. 3. The pile driver according to claim 2, wherein the radius of said arc contact surface is larger than the minimum allowable bending radius of said pipe. 4. A pile driver according to claim 2 or 3, wherein said circular arc contact surface comprises an outer peripheral surface of a rotatably supported roller. The pile driver according to any one of claims 1 to 4, wherein the pipe receiver includes a fall-off preventing portion for preventing the pipe from falling off. A base machine having an upper revolving body rotatably provided on an upper part of a lower traveling body, a leader provided at the front part of the upper revolving body so as to be able to rise and fall, and a working device capable of moving up and down along the front surface of the leader. The work device is connected to the upper revolving body by a pipe, and the upper revolving body is provided with a pipe guide arm that can be raised and lowered for supporting the pipe behind the leader. and
The leader can be changed into a long specification with a large number of leader members and a short specification with a small number of leader members by connecting a plurality of leader members in a detachable manner and rearranging the leader members,
the pipe is provided in a constrained state along the pipe guide arm from the upper rotating body, and is connected to the working device from the tip of the pipe guide arm without constraint;
In the method of using a pile driver, wherein the pipe guide arm is provided with a pipe receiver that receives the pipe that moves downward following the descent of the work device,
changing the length of the leader from the long specification to the short specification by rearranging the leader member; holding the pipe guide arm at an elevation angle corresponding to the short specification; and lowering the working device. and bringing the pipe receiver and the pipe into contact with each other in front of the lowermost portion of the slack of the pipe.

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