Auger lifting device

Abstract

To provide a lifting device for an auger for increasing pull-out force by the auger.SOLUTION: An auger lifting device 5 includes a docking frame 51 which can be attached to and detached from an auger 3, which is a rotary drive device attached to a leader 13 of a pile driver 2, from below the auger 3 and which has a structure for fixing to a base frame 41 constituting the auger 3, a lower frame 52 which includes a horizontal jack 54 disposed below the docking frame 51, and a thrust jack 53 which connects the docking frame 51 and the lower frame 52 to each other.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an auger lifting device that is detachable from an auger, which is a rotation output device of an obstacle remover. [Background technology]

[0002] When rebuilding buildings due to urban redevelopment, etc., the foundations of demolished buildings become obstacles, so it is necessary to remove the concrete and other materials that remain underground. One method for removing such obstacles involves, for example, rotating and forcing a casing with a carbide bit at its bottom into concrete and other materials. This removal method involves forcing the casing into the ground while rotating it, thereby crushing or cutting the underground obstacle, and then pulling out the casing to remove it. This removal method uses a tubing device, as described in Patent Document 1 below, as well as an obstacle removal machine, as described in Patent Document 2 below, which is a pile driver equipped with an auger, which is a rotation output device, as a device for forcing the casing into the ground while rotating it.

[0003] The tubing device grips the casing, which is a steel pipe pile, with a chuck means, and while rotating it with the rotary drive of a hydraulic motor, the casing is pushed in and pulled out with a thrust jack. On the other hand, the obstacle removal machine has an auger, which is a rotary drive device, attached to the leader of the pile driver so that it can be raised and lowered, and the auger rotates the casing gripped by the chuck, just like the tubing device. When the casing is pressed in, the auger is lowered by the lifting cylinder to rotate the casing, and when it is pulled out, the auger, which rotates the casing in the reverse direction, is raised by the lifting cylinder. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-208655 [Patent Document 2] Japanese Patent Application Laid-Open No. 2000-054773 Summary of the Invention [Problem to be solved by the invention]

[0005] Auger-equipped obstacle removal machines can move freely to multiple removal locations because the base pile driver is equipped with a crawler-based travel device. Furthermore, because the auger is relatively smaller than the tubing device, it can be placed in a narrow space, improving workability. However, obstacle removal machines equipped with augers have a problem in that the lifting cylinder attached to the pile driver's leader does not have enough force to pull out the casing. For example, if the casing is long and penetrates deep underground, the pulling resistance becomes large, making it impossible to pull out the casing, and a tubing device must be used.

[0006] SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide an auger lifting device that can be attached to and detached from the auger of an obstacle remover. [Means for solving the problem]

[0007] The auger lifting device of the present invention is detachable from the underside of the auger, which is a rotary drive device attached to the leader of a pile driver, and includes a docking frame having a fixed structure with the base frame that constitutes the auger, a lower frame equipped with a horizontal jack arranged below the docking frame, and a thrust jack that connects the docking frame and the lower frame. [Effects of the Invention]

[0008] According to the above configuration, the auger, which rotates the gripped casing, is raised and lowered along the leader of the pile driver, thereby pressing the casing into or pulling it out of the ground, and work can be performed to remove obstacles such as underground concrete. If it is difficult to pull out the casing, a docking frame can be attached to the base frame that constitutes the auger, so that the auger lifting device is integrated with the auger, and by grounding the horizontal jack of the lower frame located below the docking frame and extending the thrust jack, the auger connected to the docking frame can be pushed up, and the gripped casing can be pulled out with great force. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a perspective view showing an obstacle remover to which an auger lifting device is attached. [Figure 2] FIG. 1 is a side view showing an obstacle remover with an auger attached. [Figure 3] FIG. 10 is a side view of the auger with the auger lifting device attached thereto. [Figure 4] FIG. 2 is a plan view of the auger with the auger lifting device attached thereto. [Figure 5] FIG. 2 is a front view of the auger lifting device, with the left half showing the thrust cylinder in a contracted state and the right half showing the thrust cylinder in an extended state. DETAILED DESCRIPTION OF THE INVENTION

[0010] An embodiment of an auger lifting device according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an obstacle remover to which an auger lifting device is attached. The auger lifting device 5 of this embodiment is attached to the auger 3 as needed for an obstacle remover that normally performs work using only the auger, which is a rotation output device. FIG. 2 is a side view showing the obstacle remover 1 to which only the auger 3 is attached. First, the obstacle remover in the normal state shown in FIG. 2 will be described with reference to FIG. 1.

[0011] The obstacle remover 1 has an auger 3 attached to a leader 13 of a pile driver 2. The pile driver 2 is configured as a base machine in which an upper rotating body 12 equipped with a cab 15 is rotatably mounted on a lower traveling body 11 that can travel on crawlers. In the pile driver 2, the leader 13 is attached to the upper rotating body 12 that constitutes the base machine. The leader 13 is located at the tip of the upper rotating body 12, and is attached to the center in the width direction. Therefore, the cab 15 provided on the upper rotating body 13 is positioned off to the right so as to avoid the leader 13, which is located in the center in the width direction of the machine body.

[0012] The upper rotating body 12 is provided with a leader support 21 at the center of its tip, and the leader 13 is supported by this leader support 21. The leader 13 of the pile driver 2 is short, and the height of its upper end is approximately the same as the ceiling of the operator's cab 15. The leader 13 has parallel rail sections 23 protruding forward on both the left and right sides, and a lifting cylinder 24, which is a hydraulic cylinder, is attached between them to move the auger 3 up and down along the rail sections 23. The leader 13 is assembled so that it can swing forward and backward and left and right by a predetermined angle.

[0013] A swing crank 25 is formed on the top of the leader 13 so as to protrude rearward. The leader support 21 and the swing crank 25 have a three-dimensional shape with a width dimension, and the leader support 21 has parallel steel plates standing on both the left and right sides with the swing crank 25 between them. The swing crank 25 is positioned so as to be sandwiched between the left and right steel plates, and is pivotally supported on the front side of the leader support 21 by a support pin 31 that is parallel to the width direction of the machine body. Furthermore, on the rear side of the leader support 21, a front-rear swing cylinder 26 is pivotally attached by a connecting pin 32 that is parallel to the width direction of the machine body.

[0014] The front-rear swing cylinder 26 has an end of a cylinder tube pivotally attached to the leader support 21, while the tip of the piston rod is pivotally attached to the swing crank 25 by an action pin 33. The connecting pin 32 is located rearward of the support pin 31, and the action pin 33 is located higher than the support pin 31, so the front-rear swing cylinder 26, which is a hydraulic cylinder, is mounted tilted so that the front is higher.

[0015] The lower side of the leader support 21 is journaled to the upper rotating body 2 by a support shaft in the front-to-rear direction, and the upper side, on which the swing crank 25 and the front-to-rear swing cylinder 26 are journaled, is able to swing left and right. A left-to-right swing cylinder 27 is connected to the swinging upper side of the leader support 21. The left-to-right swing cylinder 27 is provided on one side of the leader support 21, and the end of the cylinder tube is journaled to the main body side of the upper rotating body 2, while the tip of the piston rod is journaled to the leader support 21 side via a bracket.

[0016] Next, we will briefly explain the auger 3 that constitutes the obstacle remover 1. The auger 3 is a working device that rotates the gripped casing K. The auger 3 is made up of a base frame 41 and a chuck frame 42 assembled vertically, and a work table 43 surrounded by a fence is attached to the top of the chuck frame 42. Both frames have through holes 40 formed therein through which the casing K can pass. Two hydraulic motors 45 that rotate the casing K are fixed to the base frame 41, and the chuck frame 42 is formed smaller than the base frame 41 so that the hydraulic motors 45 do not interfere with the chuck frame 42.

[0017] The base frame 41 incorporates a cone, which is a cylindrical gear member that penetrates the casing K, and is configured so that the output of the hydraulic motor 45 is transmitted to the cone via a rotation transmission gear. A reducer is attached to the hydraulic motor 45, and high-torque rotation with reduced rotation speed is output to the rotation transmission gear. The cone (not shown) has a certain gap between it and the outer surface of the casing K, and multiple tapered grooves are formed on the inner peripheral surface of the cone, with the diameter decreasing downward. Wedge-shaped chucks 44 (see FIG. 4) that fit into each of the tapered grooves are attached to a rotatable, annular rotating body in the chuck frame 42.

[0018] The base frame 41 is provided with chuck cylinders 46 at four locations, and is connected to the chuck frame 42 via the chuck cylinders 46. Therefore, the chuck frame 42 is configured to rise and fall relative to the base frame 41 as the chuck cylinders 46 extend and retract. The multiple chucks 44 attached to the chuck frame 42 move up and down integrally with the chuck frame 42 as the chuck cylinders 46 extend and retract, thereby gripping or releasing the casing K. In particular, as the casing K and the cone are lowered, the multiple chucks 44 are tightly inserted between the casing K and the cone, forming a single unit, and rotation of the cone rotates the casing K.

[0019] The auger 3 has a guide block 47 fixed to the base frame 41, and the guide block 47 is slidably attached to the rail portion 23 of the leader 13. A lifting cylinder 24 is disposed in the leader 13 between the rail portions 23, with the piston rod facing downward. The tip of the piston rod of the lifting cylinder 24 is pivotally attached to the lower end of the leader 13, and the cylinder tube is pivotally attached to the base frame 41. Therefore, when the lifting cylinder 24 contracts, the auger 3 descends as shown in FIGS. 1 and 2, and when it extends, the auger 3 ascends.

[0020] The obstacle remover 1 of this embodiment is provided with an auger lifting device 5 shown in Fig. 1 to increase the pulling force of the casing K. The auger lifting device 5 is configured to be detachably attached to the underside of the auger 3 shown in Fig. 2. Figs. 3 and 4 are a side view and a plan view of the auger lifting device 5 attached to the auger 3. Fig. 5 is a front view of the auger lifting device 5, with the left half showing the thrust cylinder in a contracted state and the right half showing the thrust cylinder in an extended state.

[0021] The auger lifting device 5 comprises a docking frame 51 and a lower frame 52 arranged one above the other and connected by four thrust jacks 53 located at the four corners. Similar to the auger 3, the docking frame 51 and the lower frame 52 are formed with through-holes 40 through which the casing K can pass. The thrust jack 53 has a cylindrical cover body 81 with a closed top fixed to the docking frame 51, and an inner cylindrical body 82 fixed to the lower frame 52 is fitted slidably from below, penetrating the docking frame 51.

[0022] Such thrust jack 53 has a hydraulic cylinder 83 built in with its piston rod facing downward, and the cylinder tube is fixed to the docking frame 51 via a cover body 81, with the tip of the piston rod pivotally attached to the lower frame 52. The cover body 81 of the thrust jack 53 protrudes upward from the docking frame 51 to ensure a stroke. Therefore, the base frame 41 and chuck frame 42 of the auger 3, which are stacked vertically, are formed in a shape that avoids interference with the cover body 81. Four horizontal jacks 54 are provided near the thrust jack 53 on the underside of the lower frame 52 of the auger lifting device 5 (the surface opposite to the surface on which the thrust jack 53 is attached).

[0023] The auger lifting device 5 has a docking frame 51 provided with a fixing structure for integrating with the base frame 41 of the auger 3 to stabilize the pulling out by the thrust jacks 53. The base frame 41 has mounting pins 56 formed to protrude downward at positions closer to the center in the machine width direction (closer to the through holes 40) of the thrust jacks 53 provided at the four corners and surrounding all four peripheries of the through holes 40 through which the casing K is inserted (in this embodiment, closer to the through holes 40 than the horizontal jacks 54, near the front and rear edges of the base frame 41, and at positions that generally overlap with the rail portions 23 of the leader 13 in the front-to-rear direction), and horizontal holes are formed in the mounting pins 56.

[0024] One docking frame 51 has receiving holes 57 formed in the vertical direction, into which the mounting pins 56 fit, and further has horizontal holes formed in positions that coincide with the horizontal holes of the mounting pins 56 and intersect with the receiving holes 57. In this type of fixing structure, the base frame 41 and the docking frame 51 are secured together by inserting the mounting pins 56 into the receiving holes 57, and then inserting the stop pins 58 into the overlapping horizontal holes. Note that the relationship between the mounting pins 56 and the receiving holes 57 may be reversed between the base frame 41 and the docking frame 51.

[0025] Next, we will explain the removal work performed by the obstacle remover 1. As shown in Figure 2, the obstacle remover 1 normally performs removal work using only the auger 3 without the auger lifting device 5 attached. When moving to the removal site, the obstacle remover 1 retracts the lifting cylinder 24, and the auger 3 is held at a low position on the leader 13. The obstacle remover 1 moves the auger 3 to a predetermined work position by operating the undercarriage 11, where it is adjusted to match the driving position of the casing K. Then, to drive the casing K straight in the vertical direction, the tilt of the leader 13 is corrected, i.e., the auger 3 is leveled, by extending and retracting the front-rear swing cylinder 26 and the left-right swing cylinder 27.

[0026] The obstacle remover 1 is provided with front jacks 61 on the left and right sides of the front of the upper rotating body 12, and leader jacks 62 on the left and right sides of the leader 13. In addition, a weight 64 can be mounted on the rear of the upper rotating body 12, and a rear jack 63 is attached to this weight 64. The obstacle remover 1 is stabilized when the front jack 61 and leader jack 62 extend and touch the ground. The weight 64 is attached as a reaction force receiver when the pulling force of the casing K becomes large, and the machine is similarly stabilized when the rear jack 63 extends and touches the ground.

[0027] Next, in the obstacle remover 1, the auger 3 is moved to a raised position by extending the lifting cylinder 24, and a first casing K equipped with a carbide bit is inserted through the through-holes 40 in the base frame 41 and the chuck frame 42. In the auger 3, the chuck cylinder 46 is contracted, inserting the chuck 44 between the auger 3 and the cone to grip the casing K. Then, when the hydraulic motor 45 is driven, its output is transmitted to the cone via a reducer and a transmission gear, and rotation is imparted to the gripped casing K.

[0028] As the lifting cylinder 24 contracts, the rotating casing K descends together with the auger 3, with the carbide bit at the tip cutting a circular path through the concrete or the like present underground. At this time, the amount of descent of the casing K is determined by the stroke of the lifting cylinder 24. Therefore, after the casing K has contracted by the stroke, the chuck cylinder 46 extends to pull out the chuck 44, and the lifting cylinder 24 switches to extension, causing the auger 3 to release its grip on the casing K and return to the raised position. Then, the chuck cylinder 46 contracts, inserting the chuck 44 back into the cone and gripping the casing K, allowing the auger 3 to re-grip the casing K, and the casing K is lowered while rotating again, repeating the process of cutting into the concrete.

[0029] Since the casing K only has a set length, an extension casing K is connected as needed for concrete located deep inside. During removal work, the casing K is extended in this way, and the auger 3 is re-gripped from bottom to top while the casing K is pressed in to the specified depth. After that, the casing K that has been pressed in to the specified depth is pulled out, and the concrete that has been cut off from the surrounding area is carried to the surface. For this, a hammer grab suspended by a mobile crane is used, and the grabbed concrete pieces are removed from the ground and removed.

[0030] The casing K is pulled out by reverse rotation of the auger 3 and lifting up of the lifting cylinder 24. At this time, the obstacle remover 1 has the reaction force when the lifting cylinder 24 pulls out the casing K supported mainly by the leader jack 62. The auger 3, which applies reverse rotation to the gripped casing K, rises along the leader 13, thereby pulling out the gripped casing K. Note that even during pulling out, the auger 3 is repeatedly re-gripped in accordance with the stroke of the lifting cylinder 24.

[0031] The pulling force for the casing K varies depending on the length of the casing K pressed into the ground and the ground conditions such as concrete, and it may be difficult to pull out the casing K using only the output of the lifting cylinder 24. Therefore, in the obstacle remover 1 of this embodiment, instead of using the lifting cylinder 24 to pull out the casing K, the pulling out is performed by an auger lifting device 5 attached to the auger 3.

[0032] To install the auger lifting device 5, as shown in Figure 3, the auger lifting device 5 is placed under the raised auger 3, and the mounting pin 56 of the base frame 41 is inserted into the receiving hole 57 of the docking frame 51. Then, as shown in Figure 5, a stop pin 58 is inserted into the horizontal holes where the mounting pin 56 and the receiving hole 57 overlap. In this way, the mounting pin 56 cannot be removed from the receiving hole 57, and the auger 3 and the auger lifting device 5 are integrated. The auger 3 with the auger lifting device 5 attached is attached to the leader 13 via the auger 3, but is grounded to the ground via a horizontal jack 54.

[0033] When the casing K is to be pulled out, the auger lifting device 5 first retracts the thrust jack 53, shortening the distance between the docking frame 51 and the lower frame 52, as shown in the left half of Fig. 5 . The auger 3 grips the casing K with the chuck 44 as the chuck cylinder 46 retracts. The auger 3 is then rotated in the reverse direction by the hydraulic motor 45, and the auger lifting device 5 extends the hydraulic cylinder 83 of the thrust jack 53, lifting the auger 3, as shown in the right half of Fig. 5 . Thus, the casing K is pulled out upward while rotating in the reverse direction. Even when the auger lifting device 5 is used, the auger 3 can only be pulled out in one go by the stroke of the thrust jack 53, so the auger 3 is re-gripped by the retraction operation.

[0034] Even when the auger lifting device 5 is used, the auger 3 is raised and lowered while being restrained by the leader 13. Therefore, the movement of the auger 3 along the leader 13 must not create resistance to the extension and retraction of the thrust jack 53. Therefore, when the auger lifting device 5 is driven to perform extraction, the hydraulic pressure is released from the lifting cylinder 24, the front-rear swing cylinder 26, and the left-right swing cylinder 27, allowing each to freely extend and retract. Note that while the use of the auger lifting device 5 has been described in connection with the extraction of the casing K, the auger lifting device 5 may also be used when pressing in the casing K.

[0035] Therefore, the obstacle remover 1 of this embodiment can freely transport the auger 3 by moving the pile driver 2, allowing for efficient removal work at multiple locations. Furthermore, even if the lifting cylinder 24 of the pile driver 2 does not have sufficient force to pull out the casing K during removal work, the obstacle remover 1 can, by attaching the auger lifting device 5 to the auger 3, exert sufficient pulling force using the thrust jack 53. In other words, the obstacle remover 1 combines the freedom of movement provided by the pile driver 2 with the large pulling force provided by the auger lifting device 5. Furthermore, the auger lifting device 5 can be attached to the auger 3 with a simple structure in which the mounting pin 56 of the base frame 41 is inserted into the receiving hole 57 of the docking frame 51, and the stop pin 58 is inserted into the horizontal hole overlapping the receiving hole 57 and the mounting pin 56, making the installation easy.

[0036] Although one embodiment of the present invention has been described above, the present invention is not limited to this and various modifications are possible without departing from the spirit of the present invention. For example, in the above embodiment, the fixing structure between the auger 3 and the auger lifting device 5 is such that the mounting pin 56 of the base frame 41 is inserted into the receiving hole 57 of the docking frame 51, but other structures may also be used. [Explanation of symbols]

[0037] 1... Obstacle remover 2... Pile driver 3... Auger 5... Auger lifting device 11... Lower running body 12... Upper rotating body 13... Leader 24... Lifting cylinder 26... Front-to-back swing cylinder 27... Left-to-right swing cylinder 41... Base frame 42... Chuck frame 44... Chuck 45... Hydraulic motor 46... Chuck cylinder 51... Docking frame 52... Lower frame 53... Thrust jack 54... Horizontal jack 56... Mounting pin 57... Receiving hole 58... Stop pin K... Casing

Claims

1. An auger lifting device that can be attached to and detached from the underside of an auger, which is a rotary drive device attached to the leader of a pile driver, a docking frame having a fixing structure with a base frame constituting the auger; a lower frame including a horizontal jack disposed below the docking frame; a thrust jack that connects the docking frame and the lower frame; An auger lifting device having:

2. 2. The auger lifting device according to claim 1, wherein the fixing structure comprises a plurality of mounting pins protruding in the vertical direction from one of the base frame and the docking frame, receiving holes formed in the vertical direction from the other into which the mounting pins are inserted, and a stop pin is inserted into overlapping horizontal holes formed in the mounting pins and the receiving holes.

Images