JP6504306B1 - Extraction equipment of existing piles - Google Patents

Abstract

An object of the present invention is to propose an existing pile drawing apparatus which has high workability and work efficiency in drawing an existing pile and is excellent in operation reliability. SOLUTION: A casing 1 provided with a hooking claw 31 which can be extended inward is provided, and a connecting rod 21 connected to a hydraulic cylinder 21 is arranged on the outer peripheral side of the casing 1, while the hooking claw 31 is While being supported by the pivot shaft 32 connected to the lower end of the rod 21 in a state of being engaged in the guide long hole 35, the guide portions 31a and 31b engaged with the cam body 33 are provided, and the rod 21 descends When the guide portions 31a and 31b engage with the cam body 33, the hooking claws 31 are tilted around the pivot shaft 32 so that the tip end side thereof projects toward the inner space 16 of the casing 1. According to such a configuration, the hooking state with respect to the existing pile 4 becomes stable and reliable, and thus the reliability in the work of pulling out the existing pile 4 is improved. [Selected figure] Figure 2

Description

  The present invention relates to a pull-out device for an existing pile for pulling out without breaking an existing pile buried in the ground.

  Generally, at the time of rebuilding a building, it is necessary to remove a pile (that is, an existing pile) buried in the old building to be dismantled as its foundation, and the method of removing the existing pile is roughly divided There are two methods, one is a method of sequentially crushing and removing the existing pile in the buried state, and the other one is a method of removing and removing the existing pile from the ground without breaking it. Then, various proposals have conventionally been made regarding this latter removal method (see, for example, Patent Documents 1 and 2).

  The pulling-out device of the existing pile shown in Patent Document 1 has an inner diameter larger than that of the existing pile and penetrates the circumferential surface in the thickness direction to the lower circumferential surface of the casing provided with a digging blade at the tip thereof. An overhanging lifting claw is provided, the casing is driven into the ground surrounding the existing pile, the lifting claw is extended at the lower end side of the existing pile, and is latched at the lower end, and the casing is in this state Together with the existing piles.

  The existing pile drawing-out apparatus shown in Patent Document 2 is connected to a driving machine and has a cylindrical casing to be driven to the existing pile, and an existing pile in the casing driven by a hydraulic cylinder at the lower part of the casing. And chucking the above-mentioned casing to the lower end side of the existing pile surrounding the existing pile, where the chuck claw is driven by the driving force of the hydraulic cylinder. It is made to project inward and be hooked to the lower end of the existing pile, and in this state, the existing pile is lifted and pulled out together with the casing.

JP 2004-339892 JP 2000-154541 A

  However, in the drawing-out device shown in Patent Document 1, the lifting claw is pivotally supported so as to be vertically movable with respect to the casing wall and always urged in the overhanging direction by its own weight. The lifting claw is rotated upward by the top or the outer circumferential surface of the existing pile to allow relative movement of the existing pile with respect to the casing, while the lifting claw is rotated by the existing pile when it moves downward beyond the lower end of the existing pile. The restriction is released, and by its own weight, the casing projects inward to be able to be engaged with the lower end of the existing pile.

  Therefore, although the casing can be driven to the lower end depth of the existing pile and the lifting claw can be hooked to the lower end to pull out the existing pile with the casing, the lifting claw can be hooked to the middle part of the existing pile. It is structurally impossible to pull it out, so for example, even if the soil around the existing pile is relatively soft and the lower end side of the existing pile remains buried to some extent in the surrounding soil, the contact resistance of the soil Even when the existing pile can be pulled out, the casing needs to be driven to the vicinity of the lower end of the existing pile, which is disadvantageous in terms of workability and efficiency.

  Further, according to the drawing device shown in Patent Document 2, the chuck claw has an arc-shaped cam groove, and the cam groove is inserted into a shaft provided on the lower end side of the casing, whereby the outside of the casing is formed. A vertically extending and retractable movement centering on the above-mentioned axis is made possible between a retreating posture substantially vertically upward and a protruding posture substantially horizontally projecting toward the inside of the casing. When the hydraulic cylinder is contracted, the chuck claws are retracted to the substantially vertical posture outside the casing, and when the hydraulic cylinder is expanded, the chuck claws are pushed down by the connecting rod and projected into the casing in a substantially horizontal posture. It is supposed to be hooked to the lower end of the.

  For this reason, particularly when the lower end of the existing pile is in a pointed shape, when pulling up the existing pile together with the casing, the chuck claws push the casing outward along the cam groove. As a result, the connecting rod is bent outward in the radial direction of the casing, and this bending action increases with the increase of the pullout resistance acting on the existing pile, and particularly around the existing pile. If the ground is hard, it can not be overlooked, which may make it difficult to maintain the reliability of the pulling operation of the existing pile.

  Therefore, the present invention has been made for the purpose of proposing an existing pile drawing apparatus having high workability and work efficiency in drawing an existing pile and excellent in reliability in work.

  In the present invention, the following configuration is adopted as a specific means for solving the problem.

  In the first invention of the present application, there is provided a casing which is suspended and supported by the support base and which has an inner diameter larger than that of the existing pile and which is provided at its lower end with a digging blade and a hook that can be extended inwardly. An existing pile in which the casing is driven to the vicinity of the tip of the existing pile in a state in which the existing pile is contained, and the hook is hooked on the existing pile so that the existing pile is pulled out with the casing. In the drawing device, a rod extending in the vertical direction along the casing and having its upper end connected to a hydraulic cylinder disposed at the upper end of the casing is disposed on the outer peripheral side of the casing, while the hooking claw is A pivot shaft connected to the lower end of the rod in a state of being disposed on the outer side facing the opening provided in the casing and having its upper end portion engaged in a straight guide elongated hole extending in the vertical direction Pivot to A guide portion is provided on the tip end side for engaging with a cam body provided at the lower end portion of the opening, and when the rod is lowered from the raised state, the hook is the guide portion and the cam body It is characterized in that by being engaged, it is tilted around the pivot shaft, and the tip end side is projected to the inner space side of the casing through the opening.

  According to a second aspect of the present invention, in the first aspect, the cam body is provided with two cam portions in the vertical direction, and the guide portion of the hooking claw is associated with the downward movement of the hooking claw. The shape of the guide portion is set so as to be simultaneously engaged with the two cam portions when it is gradually tilted and extended to the inner space side of the casing.

  According to a third invention of the present application, in the existing pile drawing-out device according to the first or second invention, the hooking claw and the rod for interlockingly connecting the hooking claw and the hydraulic cylinder are constituted. The present invention is characterized in that two or three or more latching mechanisms are provided at equal intervals in the circumferential direction of the casing.

(A) First Invention of the Present Application According to the existing pile drawing device relating to the first invention of the present application, the following effects can be obtained.

(A-1) Since the hooking claw is configured to gradually extend from the lower end side into the internal space of the casing as the rod descends, for example, the casing is in the vicinity of the lower end of the existing pile Drive the hook into the inner space below the lower end of the existing pile and hook it to the lower end of the existing pile and pull it out together with the casing (that is, the depth drawing mode) Not only that, the above-mentioned casing is driven to the depth of the middle position of the above-mentioned existing pile, and the above-mentioned hooking hook is made to hook on the outer peripheral surface of the middle part of the above-mentioned existing pile and pulled out with the casing Also, for example, high workability and work in the work of pulling out an existing pile, as compared with those that can only take a deep drawing mode as a drawing work mode such as a drawing of an existing pile described in Patent Document 1 It is possible to obtain the rate.

(A-2)
The hook is connected to the lower end of the rod in a state in which the hook is disposed on the outer side facing the opening provided in the casing and the upper end thereof is engaged with a straight guide elongated hole extending vertically. And a guide portion engaged with a cam body provided at the lower end of the opening on the tip end side, and the rod is lowered when the rod is lowered from its elevated state. The locking claw is configured to be tilted about the pivot by the engagement of the guide portion with the cam body, and the tip end side is projected to the inner space side of the casing through the opening, so that the casing is In the case where the hooking hook extended to the inner space side of the hook is hooked to the existing pile and the existing pile is pulled out with the casing, the rotational force applied to the hooking hook by the pulling resistance of the existing pile is the cam Of the body and the above hook It is supported as a couple moment by the contact force at the joint portion and the contact force at the engagement portion between the pivot shaft and the end portion of the guide long hole into which the pivot shaft is engaged. Although a compressive force remains, the force that bends and deforms the casing radially outward does not act. As a result, for example, as in the drawing device shown in Patent Document 2, the force acting on the chuck claws with the work of pulling out the existing pile acts as a bending force on the rod to which the chuck claws are connected. As compared with the conventional case, the hooking state with respect to the existing pile becomes stable and reliable, and thus the reliability in the drawing operation of the existing pile is improved.

(B) Second Invention of the Present Invention According to the existing pile drawing device relating to the second invention of the present application, in addition to the effects described in the above (a-1) and (a-2) in the first invention, The following special effects can be obtained. That is, in the present invention, while the cam body is provided with two cam portions in the vertical direction, the guide portions of the hooking claws are gradually moved to the inner space side of the casing as the hooking claws move downward. Since the shape is set such that the guide portion simultaneously engages with the two cam portions when it is tilted and extended, the contact pressure between the guide portion of the hook and the cam portion of the cam body is As a result, the durability of the hooking pawl can be improved, and the stable hooking action of the existing pile by the hooking pawl can be maintained over a long period of time.

(C) Third Invention of the Present Invention In the third invention of the present application, in the pulling-out device of the existing pile according to the first or second invention, the hooking pawl, the hooking pawl and the hydraulic cylinder can be interlocked Since two or three or more locking mechanisms configured with a connecting rod are provided at regular intervals in the circumferential direction of the casing, for example, in the one provided with two of the above-mentioned locking claw units, The locking force by the locking claw is relatively small, so it is suitable for use in pulling out a relatively small and lightweight existing pile, and in the case where three or more locking claw units are provided, the hook is Due to the relatively large locking force of the dowels, it is suitable for use in the extraction of relatively large and heavy existing piles. Therefore, these multiple types of drawing devices can be used to measure the size of existing piles to be drawn. Select according to conditions such as weight This makes it possible to always realize an efficient drawing operation.

  BRIEF DESCRIPTION OF THE DRAWINGS It is a general view of the pulling-out apparatus of the existing pile concerning the 1st Embodiment of this invention.   It is a partial cross section enlarged view of the A section of FIG.   It is an expanded sectional view of the B section of FIG. 1, Comprising: The standby state of the latching mechanism part is shown.   It is an expanded sectional view which shows the operation start state of the said latching mechanism part.   It is an expanded sectional view which shows the state which can be latched to the pile front-end | tip part of the said latching mechanism part.   It is an expanded sectional view which shows the latching state to the pile intermediate part of the said latching mechanism part.   It is CC sectional drawing of FIG.   It is a general view of the pulling-out apparatus of the existing pile based on the 2nd Embodiment of this invention.

A: First embodiment "Overall configuration of existing pile drawing device"
In FIG. 1, the drawing-out apparatus Z of the existing pile concerning the 1st Embodiment of this invention is shown. The drawing device Z is configured by connecting the casing 1 via the swivel joint 2 to the lower side of the earth auger 3 suspended and supported by a support base such as a leader.

  The casing 1 is constituted by a tube having an inner diameter (for example, about 500 mm to about 600 mm) larger by a predetermined size than the existing pile to be pulled out, and in this embodiment, the upper part is sequentially connected coaxially An upper end of the upper casing 11 is connected to the lower side of the swivel joint 2 as a three-part structure including a casing 11, an intermediate casing 12 and a lower casing 13.

  And, while being rotated by the earth auger 3, the casing 1 is driven into the soil along the existing pile in a state of including the existing pile, and cuts the soil around the existing pile, At the lower end of the lower casing 13 located at the lower end, a plurality of tip excavating blades 14 attached to the lower end peripheral wall and protruding outward in the radial direction more than the outer periphery of the lower end A plurality of outer cutting blades 15 mounted in a state are provided.

  Then, the soil in contact with the outer periphery of the existing pile 4 is cut at a position appropriately separated from the outer periphery by the respective front end excavating blades 14 and edge cutting is performed. Furthermore, the outer portion of the edge cutting portion is excavated in an annular shape of a predetermined width by the plurality of outer excavating blades 15 to form an advancing gap of the below-described claw cover 34 provided on the lower end outer periphery of the lower casing 13.

  Although not shown here, in practice, a jet nozzle is provided on the front end side of the lower casing 13, and water supplied from the upper end side of the casing 1 is supplied from the jet nozzle to the lower casing 13. Excavating work is performed by the above-described tip cutting blade 14 and the outer cutting blade 15 while spraying near the tip to promote the collapse of the soil.

  Furthermore, after the casing 1 is driven into the periphery of the existing pile 4 in the casing 1, the casing 4 is hooked to the casing 1 side to pull up (pull out) the existing pile 4 together with the casing 1 A locking mechanism 30 is provided as the subject matter of the present invention described below. Hereinafter, this locking mechanism 30 will be described in detail.

"Locking mechanism 30"
The hooking mechanism 30 comprises a hooking claw 31 attached to the outer peripheral surface near the lower end of the lower casing 13 as shown in FIG. 3 and a cam body 33 attached to the hooking claw 31 so as to be engageable. As shown in FIG. 2, it comprises a hydraulic cylinder 20 attached to the upper end side of the upper casing 11 and a rod 21 which interlocks the hydraulic cylinder 20 and the hooking claw 31 in an interlocking manner. In this embodiment, the rod 21 has a two-part structure of an upper rod 22 composed of a round bar and a lower rod 23 composed of a square bar. The hooking mechanisms 30 are disposed at two positions opposite to each other across the axial center of the lower casing 13.

  As shown in FIGS. 3 and 7, a rectangular opening 18 is provided on the peripheral wall of the lower end portion of the lower casing 13 and a claw cover 34 is attached so as to cover the opening 18 from the outside thereof. ing. Further, on the left and right side walls of the claw cover 34, guide elongated holes 35 extending in the vertical direction are formed.

  As shown in FIGS. 3 and 7, the hooking claw 31 is integrally formed of a thick plate having a substantially rectangular shape, and is engaged with the upper end portion of the hooking claw 31 so as to straddle the left and right guide slots 35 of the claw cover 34. The pivot shaft 32 is pivotally mounted in a state of penetrating the upper end in the width direction, while its lower end is a thin tip 31a scraped from the surface 31A to the back 31B. The front surface 31A has a shoulder 31b continuous to the tip 31a, an inclined guide 31c inclined so that the height gradually increases from the shoulder 31b, and a back surface continuous to the inclined guide 31c. A straight guide portion 31d extending substantially in parallel with 31B is set. On the other hand, the back surface 31B of the hooking claw 31 is a flat hooking surface 31e.

  The hooking claw 31 is attached to the claw cover 34 via the pivot shaft 32 in a posture in which the back surface 31 B is opposed to the surface of the lower casing 13. Therefore, in this state, the hooking claw 31 can be vertically moved along the guide long hole 35 of the hook cover 34 and can be tilted in the front and back direction about the pivot shaft 32. It has become.

  The lifting and lowering drive of the hooking claw 31 is performed by the hydraulic cylinder 20. That is, as shown in FIGS. 3 and 7, the lower end of the lower rod 23 is connected to the pivot shaft 32 to which the hooking claw 31 is pivoted via a tip member 36. Further, as shown in FIG. 2, the upper end of the upper rod 22 is connected to the hydraulic cylinder 20 via a slider 24. Therefore, the expansion and contraction operation of the hydraulic cylinder 20 is transmitted to the hooking claw 31 via the rod 21, and the hooking claw 31 is driven to move up and down within the length of the guide long hole 35. Become.

  As described above, the hydraulic cylinder 20 is connected to the upper rod 22 through the slider 24. In this case, the slider 24 can slide in the case 25 fixed to the casing 1 side. The hydraulic cylinder 20 is connected to one end of the slider 24 via the connection pin 26 and the upper rod 22 is connected to the other end of the slider 24 via the connection pin 27. The expansion and contraction force is properly transmitted to the rod 21 as its axial force, and the raising and lowering movement of the hooking claw 31 is performed smoothly and accurately.

  On the other hand, the tilting operation of the hooking claw 31 is realized by the hooking claw 31 engaging with the cam body 33. That is, in this embodiment, as shown in FIGS. 3 and 7, the cam body 33 is formed of a member having a substantially L-shaped cross-sectional shape, and its both edge portions are respectively the first cam portion 33a and the first cam portion 33a. It is set as 2 cam part 33b. Then, after setting the attitude of the cam body 33 such that the first cam portion 33 a is positioned on the upper side and the second cam portion 33 b is directed to the internal space 16, the cam body 33 is placed on the casing 1. It is fixed to the lower end edge of the provided opening 18.

  The positional relationship between the hooking claw 31 and the cam body 33 in this case is as follows. That is, as shown in FIG. 3, when the hooking claw 31 is at its upper limit position (the pivot shaft 32 is positioned at the upper end of the guide long hole 35) by the hydraulic cylinder 20, the hooking claw is 31 is naturally suspended from the pivot shaft 32, and its tip 31a faces the first cam 33a of the cam 33 in a non-engaging state, and the entire hooking pawl 31 is the outer peripheral surface of the lower casing 13. Are waiting outside of In the standby posture, the lower side of the hooking claw 31 faces the internal space 16 of the casing 1 through the internal space 16.

  When the hydraulic cylinder 20 is extended from the state shown in FIG. 3 and the hooking claw 31 is moved downward through the rod 21, first, as shown in FIG. 4, the shoulder of the hooking claw 31 is The portion 31b is engaged with the first cam portion 33a of the cam body 33, and the hooking claw 31 is tilted so that the lower end side thereof moves toward the opening 18 under the cam action from the first cam portion 33a. Is started.

  When the hydraulic cylinder 20 is further extended from the state shown in FIG. 4 and the hooking claw 31 is moved downward through the rod 21, the inclined guide portion 31 c of the hooking claw 31 and the straight guide The portions 31 d respectively engage with the first cam portion 33 a and the second cam portion 33 b of the cam body 33 and are gradually extended to the inner space 16 side of the casing 1. Then, as shown in FIG. 5, in the state where the pivot 32 reaches the lower end of the guide long hole 35 and further lowering is restricted, the hooking claw 31 is greatly lowered into the internal space 16. It is projected in an inclined state, and the lower end surface 4a of the existing pile 4 located at the axial center portion of the casing 1 can be latched from the lower side thereof.

  In this embodiment, the shapes of the inclined guide portion 31c and the straight guide portion 31d of the hooking claw 31 and the positions of the first cam portion 33a and the second cam portion 33b of the cam body 33 are always inclined in the above manner. The guide portion 31c and the straight guide portion 31d are set to engage with the first cam portion 33a and the second cam portion 33b (that is, to always engage at two points) Although the pressure is reduced, in other embodiments of the present invention, it is always engaged at one point or engaged at two points only at a specific position, otherwise engaged at one point. It is also possible to set to.

  As shown in FIG. 5, when the casing 1 is pulled up with the hooking surface 31 e of the hooking claw 31 hooked to the lower end side of the existing pile 4, the existing installation hooked to the hooking claw 31 The pile 4 will be pulled up (pulled out) from the ground together with the casing 1.

  When the existing pile 4 is pulled out, the rotational force applied to the hooking claw 31 by the pulling-out resistance of the existing pile 4 (that is, the existing pile 4 contacts the hooking surface 31 e of the hooking claw 31 The rotational force about the pivot shaft 32 of the hooking claw 31 due to the contact pressure generated by engagement is the contact force at the engaging portion between the cam body 33 and the hooking pawl 31 and the pivoting shaft It is supported as a couple moment due to the contact force at the engagement portion between 32 and the end of the guide elongated hole 35 into which it is inserted. Therefore, although the compression force at the time of extension of the hooking claw 31 remains on the rod 21, no force acts to bend and deform the rod 1 outward in the radial direction of the casing 1. As a result, for example, as in the drawing device shown in Patent Document 2, the force acting on the chuck claws with the work of pulling out the existing pile acts as a bending force on the rod to which the chuck claws are connected. As compared with the conventional case, the hooking state of the hooking claw 31 with respect to the existing pile 4 becomes stable and reliable, and hence the reliability in the drawing work of the existing pile 4 is improved.

  The above is the case where the hooking claw 31 is hooked to the lower end of the existing pile 4 and the casing 1 and the existing pile 4 are pulled out from the ground, but as the form of pulling out the existing pile, Instead of hooking the hooking claw 31 to the lower end of the existing pile 4 to pull it out, the hooking claw 31 may be hooked to an intermediate position of the existing pile 4 to pull it out.

  In such an operation mode, as shown in FIG. 6, the hydraulic cylinder 20 lowers the hooking claw 31 before the hooking mechanism 30 at the lower end of the casing 1 reaches the lower end of the existing pile 4. The hooking claw 31 is made to project toward the inner space 16 side, and the tip portion 31a portion thereof is pressed against the outer peripheral surface of the existing pile 4 and hooked thereto. At this time, the pressing force in the lowering direction of the hooking claw 31 by the hydraulic cylinder 20 is held. Then, the hooking force generated by the contact between the outer peripheral surface of the existing pile 4 and the tip end portion 31 a of the hooking claw 31 (that is, the frictional force acting between them) is the inclined guide of the hooking claw 31. The hook 31 is held as a couple by contact force acting between the portion 31c and the straight guide portion 31d and the first cam portion 33a and the second cam portion 33b of the cam body 33, and the hooking claw 31 is held by the existing pile 4 The above-mentioned existing pile 4 can be pulled out certainly like the case where it is made to hook on the lower end side of the above.

B: Second Embodiment FIG. 8 shows a pulling-out device Z of an existing pile according to a second embodiment of the present invention. The drawing-out apparatus Z of this embodiment is a drawing-out apparatus Z suitable for use for drawing out a relatively large and heavy existing pile, and includes, for example, a casing 1 having an inner diameter of 800 mm to 1000 mm, and the lower casing A hook 31 attached to the outer peripheral surface near the lower end of the cylinder 13, a cam body 33 attached to the hook 31 so as to be engageable with the hook 31, and a hydraulic cylinder 20 attached to the upper end of the upper casing 11; The lock mechanism 30 including the hydraulic cylinder 20 and the rod 21 for interlockingly connecting the hooking claw 31 is configured to include three at equal intervals in the circumferential direction of the casing 1.

  As described above, in the drawing-out device Z provided with three hook mechanisms 30 at equal intervals in the circumferential direction of the casing 1, the hooking force by the hook claws 31 includes two hook claws 31. Since it is larger than the case of the drawing-out apparatus Z which concerns on the said 1st Embodiment, for example, it is suitable for using it for extraction of the large-sized and heavy existing pile, and a reliable drawing-out operation | work becomes possible.

  Here, although the drawing-out apparatus Z provided with three said latching mechanisms 30 was shown, this invention is not limited to the structure which concerns, In other embodiment, three or more said latching mechanisms 30 are provided It can also be configured.

  The configuration other than the above is the same as in the case of the drawing device Z in the first embodiment, so the same members as the members described in the respective drawings of the first embodiment are denoted by the same reference numerals here. The description is omitted here by adding the corresponding description of the first embodiment.

  The pulling-out device of the existing pile according to the present invention can be widely used for the work of removing the existing pile in civil engineering and construction work.

1 · · Casing 2 · · Swivel joint 3 · · Earth auger 4 · · Existing pile 4a · · Peak surface 4b · · Side circumferential surface 11 · · Upper casing 12 · · Intermediate casing 13 · · Lower casing 18 · · Opening 20 · · Hydraulic cylinder 21 · · Rod 22 · · Upper rod 23 · · Lower rod 24 · · Slider 30 · · Locking mechanism 31 · · Locking claw 31a · · Tip portion 31b · · Shoulder portion 31c · · Inclined guide 31d · · · Straight guide portion 31e · · · Locking surface 32 · · Pivot shaft 33 · · Cam body 33a · · First cam portion 33b · · Second cam portion 34 · · Claw cover 35 · · Guide long hole Z ・ ・ Pulling device

Claims (3)

A casing which is suspended and supported by the support base and which has an inner diameter larger than that of the existing pile and which is provided at its lower end portion with a digging blade and a hook that can extend inward is provided; An existing pile drawing device which is driven to the vicinity of the tip of the existing pile in a state in which the pile is contained, and the hook is hooked to the existing pile so as to draw out the existing pile with the casing.
On the outer peripheral side of the casing is disposed a rod which extends vertically along the casing and whose upper end is connected to a hydraulic cylinder arranged at the upper end of the casing.
The hooking claw is disposed on the outer side facing the opening provided in the casing, and its upper end is connected to the lower end of the rod in a state of being engaged in a straight guide elongated hole extending vertically. While being pivotally supported by the pivot shaft, a guide portion is provided on the distal end side of the pivot portion and engaged with a cam body provided at the lower end of the opening;
When the rod descends from its elevated state, the hooking pawl is tilted about the pivot by the engagement of the guide portion with the cam body, and the tip end side thereof passes through the opening and the interior space side of the casing A pulling-out device of an existing pile characterized in that it is configured to overhang. In claim 1,
The cam body is provided with two cam portions in the vertical direction,
The guide portions of the hooking claws simultaneously engage with the two cam portions when the hooking claws are gradually tilted and extended toward the inner space side of the casing with the downward movement thereof. And the shape is set up so that the pulling-out device of the existing pile characterized by the above-mentioned. In claim 1 or 2,
Two or three or more latching mechanisms comprising the above-mentioned hooking claw and a rod that interlockably connects the hooking claw and the hydraulic cylinder are provided at equal intervals in the circumferential direction of the casing. Of existing piles characterized by

Images