JP2011026936A - Method and device for extracting buried pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for extracting a buried pile capable of easily extracting the buried pile at low working cost. <P>SOLUTION: While a casing 2 is rotated by an auger 1, the casing 2 is pressed against a ground by the fall-down operation force of a telescopic boom 23, and the ground around the buried pile 10 is annularly excavated by an excavating claw 3 provided to the distal end of the casing 2 to separate the ground and the buried pile 10. A wire rope 28 for working is applied to the buried pile 10, and raised by the lifting wire rope 27 of a crane device X to extract the buried pile 10 from the ground. Consequently, the buried pile 10 can be easily extracted at low working cost. In particular, the extraction method and the extraction device are suitable for extracting a relatively short buried pile 10. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a method for removing a buried pile buried in the ground, and a removal device used for carrying out the removal method.

  Various proposals have heretofore been made as work methods or work devices for removing buried piles buried in the ground, and the present applicant has also proposed one (see Patent Document 1).

  According to the prior application of the present applicant shown in Patent Document 1, an excavation unit comprising an auger at the front end of a crane device and a casing having a excavation claw at the front end and connected to the lower end of the auger is provided. A suspension unit that supports the suspension and supports the buried pile inserted and inserted in the rotation support portion from the outer peripheral side of the casing. The ground on the outer peripheral side of the buried pile by the excavation claw of the casing. Is excavated in a ring shape to separate the ground and the buried pile from each other, and the buried pile is clamped and supported by the clamping unit, and the buried pile is removed from the ground by pulling up the drilling unit. It is what I did.

  JP 2009-127306 A

  By the way, in what is shown by patent document 1, it is the structure which equips the said casing with a pinching unit and drives this pinching unit by oil_pressure | hydraulic, Comprising: It is suitable for using for the extraction operation | work of a comparatively long buried pile. However, there is room for improvement in that the removal of relatively short buried piles can be performed easily and at low work costs.

  Then, this invention is made | formed for the purpose of proposing the removal method and removal apparatus of the buried pile which can perform removal of a buried pile easily and at low work cost.

  The method for removing the buried pile according to the first invention of the present application is the crane device X having the telescopic boom 23 attached so as to be able to move up and down and the suspension wire rope 27 and the rotating portion 11 of the auger 1 that generates the rotational driving force. In addition, the excavation unit Z formed by connecting a straight cylindrical casing 2 having an excavation claw 3 at its tip is used, and the excavation unit Z is attached to the tip of the telescopic boom 23 of the crane device X. When the buried pile 10 buried in the ground is removed in a state in which the connecting shaft 13 provided in a direction orthogonal to the undulating surface is suspended and supported in a direction parallel to the undulating surface, the expansion and contraction is performed. A first step of setting the casing 2 on the exposed portion on the upper end side of the buried pile 10 by the expansion and contraction movement of the boom 23, and after completion of the setting of the casing 2, the expansion boom The burying claw 3 of the casing 2 pushes the casing 2 downward and maintains the concentricity of the casing 2 and the buried pile 10 by the expansion and contraction movement of the telescopic boom 23. The second step of excavating the ground around the pile 10 in an annular shape to perform edge cutting excavation between the ground and the buried pile 10, and the excavation by the raising and lowering motion of the telescopic boom 23 after the edge cutting excavation is completed. A third step of pulling up the unit Z and moving it away from the buried pile 10 and a work wire rope 28 is hung on the buried pile 10 when the excavating unit Z is moved away from the buried pile 10 or after moving away from the buried pile 10. In the fourth step, the working wire rope 28 is pulled up by the lifting wire rope 27 of the crane device X, and the buried pile 10 is removed from the ground. Is characterized by sequentially executes a fifth step that support.

  The buried pile removal apparatus according to the second invention of the present application includes an extendable boom 23 that is extended and retracted by a hydraulic mechanism, and includes a lifting wire rope 27 that is suspended from the distal end of the extendable boom 23. A crane device X and a suspension shaft 23 provided at a tip of the telescopic boom 23 of the crane device X in a direction perpendicular to the undulating surface of the telescopic boom 23 are suspended so as to be rotatable in a direction parallel to the undulating surface. The excavation unit Z is supported, and the excavation unit Z has an auger 1 that generates a rotational driving force and a straight cylindrical shape having an excavation claw 3 at the tip, and is connected to the rotation part 11 of the auger 1. It is characterized by having a casing 2 that is rotated by the auger 1.

  Therefore, according to the buried pile removal method and removal apparatus according to the present invention, the following effects can be obtained.

  While the casing 2 is rotated by the auger 1, the casing 2 is pressed to the ground side by the falling operation force of the telescopic boom 23, and the excavation claw 3 provided at the tip of the casing 2 is used to The surrounding ground is excavated in an annular shape and the ground and the buried pile 10 are cut off, and then the working wire rope 28 is hung on the buried pile 10 and the working wire rope 28 is suspended from the crane device X. Since the buried pile 10 is pulled up by the upper wire rope 27 and removed from the ground, for example, the casing 2 is provided with a hydraulically driven clamping unit, and the buried pile 10 is sandwiched by the clamping unit. The buried pile 10 can be removed easily and at a low operation cost as compared with the case of the structure to be removed. It is suitable for use in the removal work.

  In addition, since the casing 2 is pressed to the ground side by the overturning force of the telescopic boom 23, for example, the casing 2 is simply pressed to the ground side by the weight of the auger 1 or the casing 2 and the casing 2 The excavation action of the ground by the excavation claw 3 is compared to the case where the telescopic boom 23 is laid down following the movement of the casing 2 that naturally descends as the excavation claw 3 provided at the tip of 2 is excavated. To improve work efficiency.

  Furthermore, since the excavation action by the excavation claw 3 can be easily changed and adjusted by adjusting the lodging speed of the telescopic boom 23, it is possible to easily and quickly respond to changes in the ground hardness of the excavation target, and further excavation work can be performed. Efficiency can be improved.

  In addition, by adjusting the expansion and contraction movement and the undulation movement of the telescopic boom 23, it is configured to maintain the concentricity of the casing 2 that descends with the progress of excavation and the buried pile 10 positioned on the inside thereof. Edge excavation between the ground and the buried pile 10 is accurately performed, and the reliability in the excavation work and, in turn, the removal work of the buried pile 10 is improved.

  On the other hand, since the excavating unit Z has a simple structure including the auger 1 and the casing 2, for example, as compared with a case where the casing 2 includes a hydraulically driven clamping unit, The extraction device can be provided at a lower cost.

  It is a front view of the excavation unit used for implementation of the removal method of the buried pile which concerns on embodiment of this invention.   It is a side view of the said excavation unit.   It is III-III expanded sectional drawing of FIG.   It is an enlarged view of the IV section of FIG.   It is explanatory drawing of the 1st process in the extraction operation | work of a buried pile.   It is explanatory drawing of the work middle stage of the 2nd process in the extraction work of a buried pile.   It is explanatory drawing of the work final stage of the 2nd process in the extraction work of a buried pile.   It is explanatory drawing of the 3rd process in the extraction operation | work of a buried pile.   It is explanatory drawing of the 4th and 5th process in the extraction operation | work of a buried pile.

  Hereinafter, the present invention will be specifically described based on preferred embodiments.

  1 to 4 show an excavation unit Z that is used for carrying out the method for removing an embedded pile according to the present invention.

"Constitution"
The excavation unit Z is provided on the hoisting surface of the boom head 24 provided at the tip of the telescopic boom 23 of the crane apparatus X (described later) by a connecting shaft 13 provided in a direction perpendicular to the hoisting surface of the telescopic boom 23. The auger 1 and casing 2 described below are supported by being suspended so as to be pivotable in directions parallel to the telescopic boom 23 (front side and front side of the telescopic boom 23 as viewed from the telescopic boom 23). It is configured with.

  The auger 1 has a well-known structure, and is suspended and supported on the telescopic boom 23 side by connecting a suspension bracket 12 provided at the upper end to the boom head 24 by the connection shaft 13. The rotation part 11 is provided in the lower end.

  The casing 2 is a straight cylinder having an inner diameter that allows the buried pile 10 to be removed to be inserted with a predetermined gap (see FIG. 3) between the outer pile and the upper end 2 a of the auger 1. The rotary unit 11 is connected to the rotary unit 11 and is rotated integrally with the rotary unit 11 by the rotation of the rotary unit 11. Further, a plurality of excavation claws 3 are provided at predetermined intervals in the circumferential direction at the lower end of the casing 2, and the ground around the buried pile 10 is excavated in an annular shape by rotating the casing 2. It is supposed to be.

  The auger 1 is connected to a jet hose 4 extending from a separately installed high pressure water generator (not shown). The jet hose 4 passes from the auger 1 through the casing 2 to the casing. 2 is connected to a jet pipe 5 that opens downward in the vicinity of the lower end of 2, and the high-pressure water supplied from the high-pressure water generator to the jet pipe 5 through the jet hose 4 flows downward from the tip of the jet pipe 5. Is ejected as a jet W.

  As shown in FIG. 5, the crane device X is a wheel crane in which a telescopic boom 23 is attached to a swivel base 22 mounted on a moving base 21 that includes wheels and is levitated and installed by an outrigger. It is configured.

  The telescopic boom 23 includes a base end boom 23A whose base end is connected to the swivel base 22 so as to be rotatable in the vertical direction, and an intermediate boom inserted in the base end boom 23A so as to be relatively movable. 23B and a middle boom 23B, which is inserted into the intermediate boom 23B so as to be relatively movable, and has a tip boom 23C provided with a boom head 24 at the tip thereof. It is driven to extend and retract, and is driven to extend and retract by expansion and contraction of a hydraulic cylinder for raising and lowering 29 arranged between the swivel base 22 and the base end boom 23A. The hoisting hydraulic cylinder 29 and the telescopic hydraulic cylinder 31 correspond to the “hydraulic mechanism” in the claims.

  Further, the boom head 24 of the telescopic boom 23 is provided with a single top 25 extending forward, and the single top 25 has a winch 30 disposed on the proximal end side of the telescopic boom 23. A hoisting wire rope 27 extending from the upper end of the hoisting wire rope 27 is wound around, and a hook 26 is attached to a tip of the hoisting wire rope 27 that hangs downward from the single top 25.

  In this embodiment, the crane device X and the excavation unit Z constitute the “extraction device” in the claims. Moreover, in this embodiment, although the said crane apparatus X was comprised with the wheel crane as mentioned above, the crane apparatus X in this invention is not limited to the thing of the said structure, It is a movable base. The crane device can be widely applied to any crane apparatus having a structure in which a telescopic boom is mounted so as to be raised and lowered and a lifting wire rope 27 is suspended from the tip of the telescopic boom 23. Needless to say, a track crane having a telescopic boom attached thereto, or a crawler crane having a telescopic boom attached to a crawler having an endless track via a swivel base can be applied.

“Extraction work of buried pile 10”
Then, with reference to FIGS. 5-8, the extraction operation | work of the buried pile 10 embed | buried in the ground using the said excavation unit Z is demonstrated.

I: First step (see FIG. 5)
When removing the buried pile 10 buried in the ground, first, as shown in FIG. 5, the pile buried portion of the ground G is preliminarily excavated by an excavator (not shown), and this pile is buried in the preceding excavated portion Ga. The head 10a of the existing pile 9 is exposed.

  On the other hand, the crane apparatus X is levitated and installed at a position appropriately separated from the preceding excavation part Ga, and the excavation unit Z is suspended and supported by the connecting shaft 13 at the tip of the telescopic boom 23. Then, the telescopic boom 23 is appropriately expanded and contracted, and the casing 2 of the excavation unit Z is placed directly above the head 10a of the buried pile 10 exposed in the preceding excavation part Ga. Locate concentrically. In this state, the telescopic boom 23 suspends and supports the excavation unit Z in an upwardly inclined state.

  Further, pressurized water can be supplied to the jet pipe 5 through the jet hose 4. With the above, the first step is completed, and preparation for the removal work of the buried pile 10 is completed.

II: Second step (see FIGS. 6 and 7)
After preparation for the extraction work is completed, the process proceeds to the second step, and the periphery of the buried pile 10 is excavated and lowered in an annular shape to cut the outer peripheral surface of the buried pile 10 and the surrounding ground (edge cutting excavation). .

  That is, first, the auger 1 is driven to rotate the casing 2, and the crane device X is operated while the high-pressure water is ejected from the jet pipe 5, and the telescopic boom 23 is laid down at an appropriate speed. The casing 2 is lowered while maintaining the concentricity with the buried pile 10 by being reduced by an appropriate amount, and the buried pile 10 enters the tip of the casing 2.

  The ground around the head 10a of the buried pile 10 by the excavation claw 3 by the rotation of the casing 2 from the time when the excavation claw 3 reaches the surface portion of the preceding excavation part Ga as the casing 2 descends. The excavation action is started while receiving the ground collapse action by the jet W from the jet pipe 5.

  In this case, the expansion movement of the telescopic boom 23 is continuously performed at a predetermined speed, so that the operation force of the expansion boom 23, that is, the reduction driving force of the hoisting hydraulic cylinder 29 is reduced. It is always put on the casing 2 via the auger 1, and the excavation work of the ground by the excavation claw 3 at the tip of the casing 2 is continuously performed at a predetermined speed, and stable edge cutting excavation is performed. In this case, since the excavation action by the excavation claw 3 can be easily changed and adjusted by adjusting the lodging speed of the telescopic boom 23, it is possible to easily and quickly respond to changes in the ground hardness of the excavation target. Work efficiency can be further improved.

  Further, when the fall boom of the telescopic boom 23 is executed, the contraction movement of the telescopic boom 23 is executed correspondingly, so that the casing 2 and the buried pile 10 are irrespective of the progress of the edge cutting excavation. Concentricity is always maintained.

  The excavated soil excavated by the excavating claw 3 remains in the annular excavation hole H between the excavated ground wall and the outer peripheral surface of the casing 2, and the excavated soil is excavated in the casing 2. Since the crushing action by the claw 3 and the collapsing and kneading action by the jet W are applied to form a slurry, even if it remains in the excavation hole H, the rotation of the casing 2 and the excavation action by the excavation claw 3 are almost impossible. It does not affect.

  As shown in FIG. 7, the edge cutting excavation is continued until the excavation claw 3 of the casing 2 reaches the vicinity of the distal end portion 10 b of the buried pile 10. The movement is stopped and the rotation of the auger 1 and the ejection of the jet W from the jet pipe 5 are stopped.

  At the time of completion of this edge cutting excavation, only the tip portion 10b of the buried pile 10 is slightly buried in the ground, and other portions are separated from the surrounding ground, and the buried pile 10 has its tip portion 10b. The standing state is maintained by the holding action of the buried portion. In this case, since the slurry-like excavated soil remaining in the excavation hole H remains around the buried pile 10, the tip portion 10b of the buried pile 10 is buried in the ground. It is not always necessary, and for example, it is possible to perform the edge cutting excavation up to the tip portion 10b of the buried pile 10 to completely remove the buried pile 10 from the ground. Therefore, it is sufficient to determine at which position of the buried pile 10 the edge excavation should be performed on the ground, taking into account the hardness of the ground, the holding power of the slurry excavated soil, and the like.

III: Third step (see FIG. 8)
When the edge cutting excavation is completed, the process proceeds to the third step, where the casing 2 is pulled up and separated from the buried pile 10. That is, the casing 2 is rotated in the direction opposite to that during the excavation, and the casing 2 is pulled up from the excavation hole H while the telescopic boom 23 is lifted and extended, and this is removed from the buried pile 10. Separate from. In this case, the lifting action of the casing 2 is that the excavated soil is in the form of a slurry and has a low fixing force to the surface of the casing 2, and the casing 2 and the excavation claw 3 at the tip thereof rotate to cause the excavation. Since the soil fixing action itself is reduced, even if the excavated soil remains in the excavation hole H, the casing 2 can be easily pulled up without being affected by this.

  Here, the rotation direction of the casing 2 is set to be opposite to that during excavation. However, depending on the shape of the excavation claw 3, it can be rotated in the same direction as during excavation. Therefore, it is not necessary to temporarily stop the rotation of the casing 2 at the time of completion of the edge cutting excavation, and it is possible to proceed to the lifting operation (third step) of the casing 2 while continuing the rotation.

IV: 4th process and 5th process (refer FIG. 9)
Next, the telescopic boom 23 is reduced by an appropriate amount from the pulled-up state of the casing 2 shown in FIG. 8, and the casing 2 is retracted from the position directly above the buried pile 10 to the side as shown in FIG. Let Then, the work wire rope 28 is manually hung near the head 10a of the buried pile 10 and one end thereof is hooked by the hook 26 of the lifting wire rope 27 (fourth step).

  Thereafter, the hoisting wire rope 27 is wound up, and the buried pile 10 is pulled upward from the excavation hole H by the work wire rope 28 (a state shown by a chain line in FIG. 9), and placed at an appropriate position. (5th process). With the above, the extraction work of the buried pile 10 is completed.

  In this embodiment, the casing 2 is pulled up and separated from the buried pile 10, and then the working wire rope 28 is hooked on the head 10a of the buried pile 10 by manual work. For example, one end side of the working wire rope 28 is preliminarily charged at the distal end side of the casing 2 and the casing 2 is reversely rotated after the edge cutting is completed. Thus, the work wire rope 28 can be automatically hooked in the vicinity of the tip 10b of the buried pile 10.

1 ·· Auger 2 ·· Casing 3 · · Excavation claw 4 · · Jet hose 5 · · Jet pipe 10 · · Buried pile 11 · · Rotating part 12 · · Suspension bracket 13 · · Connecting shaft 21 · · Moving base Rotating base 23 Extensible boom 24, boom head 25, single top 26, hook 27, lifting wire rope 28, working wire rope 29, hoisting hydraulic cylinder 30, winch 31・ ・ Hydraulic cylinder C ・ ・ Ground X ・ ・ Crane device Z ・ ・ Drilling unit

Claims (2)

A crane device (X) having a telescopic boom (23) driven to extend and retract by a hydraulic mechanism and a lifting wire rope (27) suspended from the tip of the telescopic boom (23); Using the excavation unit (Z) formed by connecting a straight cylindrical casing (2) having an excavation claw (3) at its tip to the rotating part (11) of the auger (1) that generates force, the crane The excavation unit (Z) is placed at the tip of the telescopic boom (23) of the device (X), and the connecting shaft (13) provided in a direction orthogonal to the undulating surface of the telescopic boom (23) is parallel to the undulating surface. A method for removing an embedded pile, in which the embedded pile (10) embedded in the ground is removed in a state where it is supported so as to be pivotable in any direction,
A first step of setting the casing (2) on the exposed portion on the upper end side of the buried pile (10) in an externally fitted state by the expansion and contraction movement and the undulation movement of the expansion boom (23);
After the setting of the casing (2) is completed, the casing (2) is pressed downward by the inclining operation force of the telescopic boom (23) and the casing (2) and the embedment are embedded by the telescopic movement of the telescopic boom (23). While maintaining concentricity with the pile (10), the ground around the buried pile (10) is excavated in an annular shape by the excavation claw (3) of the casing (2), and the ground and the buried pile (10) A second step of performing edge cutting excavation with
A third step of pulling up the excavating unit (Z) by the raising and lowering movement of the telescopic boom (23) and moving away from the buried pile (10) after completion of the edge cutting excavation;
A fourth step of hanging the work wire rope (28) on the buried pile (10) at the time of leaving or leaving the buried pile (10) of the excavating unit (Z);
A fifth step of pulling up the buried pile (10) from the ground by pulling up the working wire rope (28) by the lifting wire rope (27) of the crane device (X);
A method for removing buried piles, characterized in that A crane device (X) comprising a telescopic boom (23) driven to extend and retract by a hydraulic mechanism and a lifting wire rope (27) suspended from the tip of the telescopic boom (23);
The crane device (X) can be pivoted in a direction parallel to the undulating surface by a connecting shaft (13) provided at the tip of the telescopic boom (23) in a direction perpendicular to the undulating surface of the telescopic boom (23). And equipped with a digging unit (Z) supported by suspension,
The excavation unit (Z) has an auger (1) that generates a rotational driving force, and a straight cylindrical shape having an excavation claw (3) at the tip, and is connected to a rotating part (11) of the auger (1). A buried pile removing device comprising a casing (2) that is rotated by the auger (1).

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