JP6539890B2 - Method and apparatus for extracting buried pile - Google Patents

Description

  The present invention relates to a method and an apparatus for extracting a buried pile which can be easily and reliably pulled out by winding a pile holding wire provided at a lower end portion of a digging casing around a buried pile in the ground.

Conventionally, a method as shown in FIGS. 8 (a) and 8 (b) has been known to pull out a buried pile buried in the ground (cited reference 1).
(1) Check the position of the buried pile 10 to be pulled out in the ground, rotate the drilling casing 11 around the buried pile 10 and excavate the excavation hole 17 with the excavation blade 12 at the tip, and excavate the buried pile 10 and excavating Cut the contact with the inner wall surface of the hole 17.
(2) Pull up the drilling casing 11 from the drilling hole 17 and set one end groove 14 and another end groove 15 formed two at a predetermined interval on one end and the other end of the lower end of the drilling casing 11 as shown in FIG. A ring-shaped wire 13 as shown in FIG. 8 (a) is led from the inside of the drilled casing 11 to the outside of the other end groove 15 through the outside of the one end groove 14. The wire 13 between them is hooked to the hooking portion of the inner wall of the drilling casing 11 as shown by the dotted line, and the drilling casing 11 is inserted again to the lower end portion of the buried pile 10.
(3) In this state, when the other end 19 of the wire 13 is pulled up, the wire 13 is detached from the hooking portion of the inner periphery of the drilling casing 11 and becomes substantially parallel in the lower surface portion 16 of the buried pile 10 It will be in the state of holding the lower surface part 16 of ten.
(4) The drilled casing 11 is pulled up while applying tension to the wire 13, and the lower surface portion 16 of the buried pile 10 is pulled out while being held by the wire 13.

  Another example of the cited document 1 is, as shown in FIG. 9A, configured to support the lower surface portion 16 of the buried pile 10 in a grid shape by a set of two wires 13 crossing each other, and one end 18 of each is In this method, the embedded pile 10 is pulled out by fixing to the drilled casing 11, pulling out the other end 19 and simultaneously pulling up the other end 19 of the two wires 13.

  In still another example, as shown in FIG. 9 (b), one wire 13 is used, and the one end portion 18 is not fixed and connected via the outside of the drilling casing 11, By simultaneously pulling up the other end 19 of the two wires 13, the buried pile 10 is pulled out.

JP, 2015-214795, A

According to Patent Document 1, in the method shown in FIGS. 8 (a) and 8 (b), two wires 13 having a width smaller than the diameter of the buried pile 10 are used as a pair of parallel lines. In the method shown in FIGS. 9 (a) and 9 (b), the wire 13 is made into a pair of parallel lines by two wires having a width smaller than the diameter of the buried pile 10, The wire 13 is disposed so that the two sets cross each other, and the lower surface portion 16 of the buried pile 10 is held and pulled out.
In these conventional methods, a pair of parallel wires 13 for holding the lower surface portion 16 of the buried pile 10 extends from one end of the drilling casing 11 to the other end, and this length is It is sufficiently longer than the diameter of the pile 10. The lower surface portion 16 of the buried pile 10 does not have a hook to which the wire 13 is pulled, but rather has a taper for driving the buried pile 10, and the wire 13 stretches under load As a result, the wire 13 may come off the lower surface portion 16 at the time of withdrawal, which may make it impossible to withdraw. The same problem occurs when the parallel wires 13 are arranged to cross each other.
Further, the center point of the buried pile 10 and the center point of the drill casing 11 are not drilled so that the drill holes 17 completely coincide with each other, but a positional deviation occurs at the center. Due to such positional deviation, the load is not evenly applied to the two parallel wires 13, and there is a possibility that the holding of the lower surface portion 16 is insufficient and the drawing can not be performed.

  In the present invention, even if the buried pile has a circular cross-section, it has a shape other than a circular cross-section, or even if the drilling hole and the buried pile are misaligned, the wire for drawing can be reliably wound around the buried pile. It is an object of the present invention to provide a method and an apparatus for pulling out a buried pile which can pull the buried pile easily and reliably.

The method of the present invention
The excavated hole 30 is excavated by the excavating casing 21 around the embedded pile 20, and the pile holding annular portion 24 of the pile holding wire 23 is wound around the embedded pile 20, and the embedded pile 20 together with the excavated casing 21 by the heavy machine 40 In the method of pulling out the buried pile that was pulled out,
A plurality of suspension wires 27 are suspended from the vicinity of the lower end portion of the casing 21 for drilling into the wire storage recess 25 provided on the inner wall surface of the casing 21 for drilling, and at least two turns around the suspension ring 29 of the suspension wire 27 The pile holding annular portion 24 is supported, the pile holding annular portion 24 is temporarily fixed in the wire storage recess 25, and the straight portions 43 at both ends of the pile holding annular portion 24 are the casing 21 for excavating Guiding to the wire guide groove 32 on the outer periphery of and connecting it to a heavy machine 40 such as a pulling crane on the ground;
Drilling the drilling hole 30 with the drilling casing 21 in which the pile holding wire 23 is attached around the buried pile 20;
A step of pulling up the pile holding wire 23 through the connecting rod 39 with the heavy machine 40, squeezing the pile holding annular portion 24, and winding it around the buried pile 20;
After winding the pile holding wire 23 around the buried pile 20, fixing the pile holding wire 23 to the digging casing 21;
It comprises a process of pulling out the buried pile 20 by pulling up the pile holding wire 23 and the casing 21 for excavation.

At least three hanging wires 27 are provided at substantially equal intervals, and when the pile holding wire 23 is squeezed, the pile holding annular portion 24 forms a polygon.
The heavy machine 40 is connected to the straight portion 43 of the pile holding wire 23 via the connecting rod 39, and the connecting rod 39 is fixed to the digging casing 21 by the fixing means 44.
The suspending wire 27 attaches the fixing portion 28 at the upper end to the outer surface of the casing 21 for excavation and suspends the suspending ring 29 at the lower end from the wire suspending notch 37 provided in the wire accommodating recess 25 in the wire accommodating recess 25 It is characterized by

The device of the present invention is
In the case of a buried pile in which the drilling hole 30 is excavated by the drilling casing 21 around the buried pile 20, the pile holding wire 23 is wound around the buried pile 20, and the buried casing 20 is pulled out together with the digging casing 21 by the heavy machine 40 In the extraction device,
The pile holding wire 23 is composed of a pile holding annular portion 24 wound at least twice for winding around the buried pile 20, and a straight portion 43 in which both ends of the pile holding annular portion 24 are extended upward, The excavating casing 21 is provided on an inner wall near the lower end thereof, and a wire accommodating recess 25 whose entire periphery is opened inward for accommodating the pile holding annular portion 24 and guiding the straight portion 43 upward And a wire guide groove 32 provided in the excavating casing 21 and suspended from the excavating casing 21 to support the pile holding annular portion 24 at the lower end portion in the wire storage recess 25. A plurality of suspension wires 27 each having a suspension ring 29 are provided, and the winding position of the pile holding wire 23 on the buried pile 20 is fixed in the wire guide groove 32. Characterized in that a securing means 44.

The tip end of the pile holding wire 23 and the heavy machine 40 are connected by a PC steel rod 39, and the fixing means 44 clamps and fixes lock nuts 38 provided on the PC steel rod 39 at predetermined intervals in the wire guide groove 32. Means for
The wire storage recess 25 has a U-shaped cross section with an open inside, and is provided with a wire suspension notch 37 on the upper surface of which a suspension ring 29 of the suspension wire 27 hangs down.

  The wire storage recess 25 is characterized in that a tie window 34 provided at a predetermined interval on the outer surface, and a fixing member 35 for holding the pile holding annular portion 24 facing the tie window 34 are provided.

According to the invention of claim 1,
An excavating hole is excavated by an excavating casing around an embedding pile, and a pile holding ring of a pile holding wire is wound around the embedding pile, and the excavating pile is pulled out together with the excavation casing by a heavy machine. In
A plurality of suspension wires are suspended from the vicinity of the lower end portion of the casing for excavation to a wire storage recess provided on the inner wall surface of the casing for excavation, and the ring holding portion for piles held at least twice by the suspension wire is supported The pile holding annular portion is temporarily fixed in the wire storage concave portion, and the straight portions at both ends of the pile holding annular portion are guided to the wire guide groove of the outer periphery of the digging casing and connected to a heavy equipment on the ground The process to
Drilling a drilling hole in the drilling casing in which the pile holding wire is attached around the buried pile;
Pulling up the pile holding wire via the connecting rod with the heavy machine, squeezing the pile holding annular portion, and winding it around a buried pile;
Fixing the pile holding wire to a digging casing after winding the pile holding wire to a buried pile;
Since the process of pulling out the buried pile by pulling up the pile holding wire and the casing for excavation is performed, the following effects are obtained.
-Since the pile holding wire is temporarily fixed to the wire storage recess of the casing for drilling and the drilling hole is drilled around the buried pile, drilling of the drilling hole and feeding to the pile tip of the pile holding wire can be performed simultaneously.
-Since the pile holding wire is fixed to the digging casing after being wound around the buried pile by the pile holding wire, the digging casing and the buried pile can be pulled out simultaneously.
-The pile holding ring portion is supported by a plurality of hanging wires suspended, and both ends of the pile holding ring portion are guided to the wire guide grooves of the digging casing and pulled up by heavy equipment on the ground, so pile holding The annular part can be reliably wound around the buried pile even if the drilling casing and the buried pile are misaligned.
-Since the pile holding annular part is supported by a plurality of suspension wires, the pile holding annular part reliably holds the wound state when pulling up the buried pile, and the pile holding wire may be detached from the buried pile There is no
-Since earth and sand do not get caught between the drilling blade and the wire when drilling the ground with the drilling blade, the ground is surely removed from the wire storage and buried even if the ground is not muddy with drilling water It can be wound around a pile.

According to the invention of claim 2,
Since at least three hanging wires are provided at substantially equal intervals, and the pile holding ring portion forms a polygon when the pile holding wire is squeezed, holding and holding the lower end portion of the buried pile securely Can.

According to the invention of claim 3,
The heavy machine is connected to the straight portion of the pile holding wire via the connecting rod, and the connecting rod is fixed to the casing for excavation by the fixing means. Therefore, the casing for excavation and the pile holding wire are integrally fixed, The pile holding wire does not loosen when pulling up.

According to the invention of claim 4,
The hanging wire has the fixing portion at the upper end attached to the outer surface of the casing for digging, and the hanging ring at the lower end is suspended from the wire suspension notch provided in the wire storage recess into the wire storage recess. The part is narrowed toward the approximate center, and can be wound and held regardless of the cross-sectional shape of the pile.

According to the invention of claim 5,
In an extraction device for an buried pile comprising a drilling casing for drilling a drilling hole around a buried pile and a pile holding wire for pulling out the buried pile together with the drilling casing by a heavy machine wound around and connected to the buried pile ,
The pile holding wire comprises a pile holding ring portion which is at least two turns for winding around the buried pile, and a straight portion in which both ends of the pile holding ring portion are extended upward, and the digging casing is A wire storage recess is provided on the inner wall near the lower end and the entire periphery for storing the pile holding annular portion is opened inward, and the drilling casing for guiding the straight portion upward And a plurality of suspension wires suspended from the casing for excavation and supporting the pile holding annular portion in the wire storage recess at the lower end portion, and the wire guide groove is provided with the wire guide grooves. Since the fixing means for fixing the winding position of the pile holding wire to the buried pile is provided, a wire storage recess is formed in the lower end portion of the casing for drilling, and a wire guide groove is formed in the side, It can be the lower end of the cutting casing obtain withdrawal device buried piles of simple structure, such as providing a plurality of suspension wires.

According to the invention of claim 6,
The tip of the pile holding wire is connected to a heavy machine with a PC steel rod, and the fixing means is a means for clamping and fixing a lock nut provided at a predetermined distance on the PC steel rod in the wire guide groove. Fixation of the pile holding wire to the digging casing after winding the buried pile with the holding wire can be securely fixed.

According to the invention of claim 7,
The wire storage recess has a U-shaped cross section with an open inside, and a wire hanging notch on which the hanging ring of the hanging wire hangs down is provided on the upper surface, so that drilling of the drilling hole by the drilling casing can be performed without any problem .

According to the eighth aspect of the invention,
The wire storage recess is provided with a tie window provided at a predetermined interval on the outer surface, and a fixing member for holding the pile holding annular portion facing the tie window, so the ring retention ring to the wire storage recess is formed. Temporary holding work of the department is easy.

The Example 1 of the extraction method of the buried pile by this invention and its apparatus is shown, (a) is a longitudinal cross-sectional view of the front-end | tip part of the casing 21 for digging, (b) is a perspective view of the pile holding wire 23. is there. It is the sectional view on the AA line in FIG. 1 (a). It is the BB sectional drawing in FIG. 1 (a). The drawing method and the apparatus of the buried pile by this invention are shown, (a) is a state in which the annular portion 24 for holding a pile holding wire 23 is narrowed and wound around the pile tip end 26 of the buried pile 20 The front view which carried out partial notch cutting off, (b) is the CC sectional view taken on the line of (a). (A) is a bottom view showing an example of four hanging wires 27 showing a second embodiment of the method and apparatus for pulling out a buried pile according to the present invention; (b) is a method for pulling a buried pile according to the present invention It is a bottom view which shows the example of the suspension wire 27 which shows Example 3 of an apparatus two. The drawing method and the device of the buried pile by the present invention are shown, and (a) is a bottom view showing an example in which the pile holding annular portion 24 of the pile holding wire 23 is wound around the square pillar buried pile 20; In (b), the center point O1 of the casing 21 for excavation and the center point O2 of the cylindrical buried pile 20 are misaligned, and the buried pile 20 is wound around the pile holding annular portion 24 of the pile holding wire 23 and pulled out. It is a bottom view which shows. It is operation explanatory drawing of the extraction method of the buried pile by this invention, and its apparatus, (a) is a drilling process figure around the buried pile 10, (b) is an annulus for pile holding of the lower end part of pile holding wire 23 (C) is a process drawing for narrowing the pile holding annular part 24 around the buried pile 20 to fix the pile holding wire 23 to the digging casing 21; (d) is a digging casing 21 It is the process drawing of pulling out the underground pile 20 by pulling up. The drawing apparatus of the conventional buried stake of patent document 1 is shown, (a) is a bottom view of the front-end | tip of the casing 11, (b) is sectional drawing of (a). The other example of the extraction apparatus of the conventional buried pile of patent document 1 is shown, (a) is a bottom view of the tip using two wires 13, (b) is one wire 13 It is a bottom view of another example using.

The extraction method of the buried pile according to the present invention is
The excavated hole 30 is excavated by the excavating casing 21 around the embedded pile 20, and the pile holding annular portion 24 of the pile holding wire 23 is wound around the embedded pile 20, and the embedded pile 20 together with the excavated casing 21 by the heavy machine 40 In the way it was pulled out,
A plurality of suspension wires 27 are suspended from the vicinity of the lower end portion of the casing 21 for drilling into the wire storage recess 25 provided on the inner wall surface of the casing 21 for drilling, and at least two turns around the suspension ring 29 of the suspension wire 27 The pile holding annular portion 24 is supported, the pile holding annular portion 24 is temporarily fixed in the wire storage recess 25, and the straight portions 43 at both ends of the pile holding annular portion 24 are the casing 21 for excavating Guiding to the wire guide groove 32 on the outer periphery of and connecting it to a heavy machine 40 such as a pulling crane on the ground;
Drilling the drilling hole 30 with the drilling casing 21 in which the pile holding wire 23 is attached around the buried pile 20;
A step of pulling up the pile holding wire 23 through the connecting rod 39 with the heavy machine 40, squeezing the pile holding annular portion 24, and winding it around the buried pile 20;
After winding the pile holding wire 23 around the buried pile 20, fixing the pile holding wire 23 to the digging casing 21;
And a step of pulling out the buried pile 20 by pulling up the pile holding wire 23 and the casing 21 for excavation.

At least three of the hanging wires 27 are provided at substantially equal intervals, and when the pile holding wire 23 is squeezed, the pile holding annular portion 24 forms a polygon.
The heavy machine 40 is connected to the straight portion 43 of the pile holding wire 23 via the connection rod 39, and the connection rod 39 is fixed to the digging casing 21 by the fixing means 44.
The suspending wire 27 attaches the fixing portion 28 at the upper end to the outer surface of the casing 21 for digging and suspends the hanging ring 29 at the lower end from the wire suspending notch 37 provided in the wire storing recess 25 into the wire storing recess 25. Lower.

The extraction device for buried pile according to the present invention is
In an apparatus in which the drilling hole 30 is excavated by the drilling casing 21 around the buried pile 20 and the pile holding wire 23 is wound around the buried pile 20 so that the digging pile 21 is pulled out together with the digging casing 21 by the heavy machine 40
The pile holding wire 23 is composed of a pile holding annular portion 24 wound at least twice for winding around the buried pile 20, and a straight portion 43 in which both ends of the pile holding annular portion 24 are extended upward, The excavating casing 21 is provided on an inner wall near the lower end thereof, and a wire accommodating recess 25 whose entire periphery is opened inward for accommodating the pile holding annular portion 24 and guiding the straight portion 43 upward And a wire guide groove 32 provided in the excavating casing 21 and suspended from the excavating casing 21 to support the pile holding annular portion 24 at the lower end portion in the wire storage recess 25. A plurality of suspension wires 27 each having a suspension ring 29 are provided, and the winding position of the pile holding wire 23 on the buried pile 20 is fixed in the wire guide groove 32. Providing a securing means 44.

The tip end of the pile holding wire 23 and the heavy machine 40 are connected by a PC steel rod 39, and the fixing means 44 clamps and fixes lock nuts 38 provided on the PC steel rod 39 at predetermined intervals in the wire guide groove 32. Means for
The wire storage recess 25 has a U-shaped cross section with an open inside, and has a wire hanging notch 37 on the upper surface of which a hanging ring 29 of the hanging wire 27 hangs down.
The wire storage recess 25 is provided with a tie window 34 provided on the outer side surface at a predetermined interval, and a fixing member 35 for holding the pile holding annular portion 24 facing the tie window 34.

Hereinafter, a first embodiment of the method and apparatus for extracting a buried pile according to the present invention will be described based on FIGS. 1 to 3.
The buried pile 20 is buried in the ground and is intended to be pulled out by the method and device for pulling out the buried pile according to the present invention, and the external shape of the cylindrical shape, cylindrical shape, etc. is often circular in cross section. The first embodiment exemplifies a circular cross section, but the present invention is not limited to the circular cross section, and may have a prismatic shape, a sheet shape, etc., and the present invention can be used regardless of the cross sectional shape.
The reference numeral 21 denotes a drilling casing for drilling a drilling hole 30 around the buried pile 20 in order to pull out the buried pile 20. This excavating casing 21 mainly comprises a metal cylindrical body 42 having a diameter of 700 mm, a length of 1000 mm, and a thickness of about 9 mm if the buried pile 20 has a diameter of about 300 mm, and a digging blade 22 is provided at the lower end. The cylindrical bodies 42 are sequentially connected according to the length of the buried stake 20.

  In the vicinity of the lower end portion of the excavating casing 21, a wire having a U-shaped cross section whose inside is opened to accommodate the pile holding annular portion 24 of the pile holding wire 23 while being located slightly above the attachment position of the digging blade 22 The storage recess 25 bulges outward and is provided with a continuous space around the entire periphery. A tie window 34 is opened at a predetermined interval on the outer peripheral wall surface of the wire storage recess 25, and a temporary wire such as a number line for temporarily fixing the pile holding annular portion 24 is provided inside the tie window 34. A fixing member 35 for connecting the holding member 33 is provided.

  A wire guide groove 32 is formed in the vertical direction on the outer surface of the cylindrical body 42 of the drilling casing 21, and a wire pull-out notch 36 communicates with the wire storage recess 25 at the lower end of the wire guide groove 32. It is provided. As shown in FIG. 1 (b), the pile holding wire 23 has a circular pile holding annular portion 24 that extends at least twice from one end 23a to reach the other end 23b. The diameter of the pile holding annular portion 24 is set to be stored in the wire storage recess 25. The one end portion 23a and the other end portion 23b are continuous with the straight portion 43 extending upward through the wire pull-out notch 36, and the upper end portion of the straight portion 43 is connected via a connection ring 38 such as PC steel rod The connection rod 39 is connected to a heavy machine 40 such as a crane described later. In the middle of the connecting rod 39, fixing means 44 such as a plurality of PC lock nuts are provided at predetermined intervals.

  The pile holding annular portion 24 is suspended by a plurality of suspension wires 27 arranged at predetermined intervals. An upper end portion of each of the suspension wires 27 is fixed to an outer wall portion of the cylindrical body 42 by a fixing portion 28, and is supported through a pile holding annular portion 24 on a suspension ring 29 provided at a lower end portion. The pile holding annular portion 24 of the pile holding wire 23 formed in this manner is stored from the inside of the wire storage recess 25 so that the pile holding annular portion 24 does not protrude inward of the digging casing 21. Is temporarily fixed to the fixing member 35 by temporary holding members 33 at a plurality of places. In the temporarily fixed state, the pile holding annular portion 24 does not protrude to the inside of the cylindrical body 42, and therefore, the digging of the digging hole 30 by the digging casing 21 is not disturbed.

  The suspending wire 27 and the fixing portion 28 are surrounded by the protective cover 31 and the protective frame 41 on the outside of the cylindrical body 42 and are protected from soil during digging of the digging hole 30 by the digging casing 21. The suspension ring 29 is suspended from the wire suspension notch 37 continuously formed on the upper surface of the wire storage recess 25 and the side surface of the cylindrical body 42 into the wire storage recess 25 to hold the pile holding wire 23 in piles. While holding the annular portion 24, when the pile holding annular portion 24 is squeezed by the pulling force of the linear portion 43, the temporary holding member 33 is cut, and the suspension wire 27 is drawn toward the center.

In FIG. 1 (b), FIG. 2, FIG. 3 and FIG. 4 (b), the example which provided three suspension wires 27 at intervals of 120 degrees, and suspended and held the pile holding annular part 24 of the pile holding wire 23. However, as shown in FIG. 5A, four suspension wires 27 may be provided at an interval of 90 degrees to suspend the pile holding annular portion 24 of the pile holding wire 23, or , 5 or more may be provided. However, if the number of the hanging wires 27 is too large, the earth and sand between the drilling casing 21 and the buried pile 20 become a resistance when pulling out the buried pile 20, so that the range where the buried pile 20 can be held reliably It is desirable to reduce the number within.
The pile holding annular portion 24 of the pile holding wire 23 is positioned below the buried pile 20, and the pile holding annular portion 24 is narrowed by the diameter of the buried pile 20, and then the pile holding annular portion 24 is buried. In the case where the lower end portion of 20 is to be held, it is desirable that the pile holding annular portion 24 have a polygonal shape such as a triangle or a quadrilateral, so the number of suspension is desirably three or more.
However, as shown in FIG. 5A, when the pile holding annular portion 24 is positioned on the side of the buried pile 20 and wound in a state where the pile holding annular portion 24 is stored in the wire storage recess 25, 2. The hanging wires 27 may be provided at equal intervals of 180 degrees.

The operation of the above configuration will be described based on FIG. In addition, in FIG. 7, the example in which the suspension wire 27 is suspended by four is shown.
Figure 7 (a)
The position of the buried pile 20 buried in the ground is confirmed, and drilling of the drilling hole 30 is started by the drilling blade 22 by the rotation of the casing 21 around the buried pile 20, but prior to the drilling of the drilling hole 30, 1 (a) and (b), at least two turns of the pile holding wire 23 sequentially on the suspension rings 29 of the plurality of suspension wires 27 suspended from the outer surface near the tip of the drilling casing 21 The pile holding annular portion 24 having a size enough to be stored inside the wire storage recess 25 is formed and stored from the inside of the wire storage recess 25, and the temporary holding member 33 is inserted from the tie window 34. The pile holding annular portion 24 is temporarily fixed to the fixing member 35 so as not to protrude to the inside of the cylindrical body 42. The straight portion 43 above the one end 23a and the other end 23b of the pile holding annular portion 24 is along the wire guide groove 32 from the wire pull-out notch 36, and the connection ring 38 is connected to a connecting rod such as PC steel rod Connect with 39.
Thus, the tip of the buried pile 20 is excavated by the excavating casing 21 in which the pile holding wire 23 is stored. At the time of excavation, water or the like may be jetted from the tip with a hose along the inside or the outside of the cylindrical portion 35 of the casing 21 for excavation.

Fig. 7 (b)
When the position of the wire storage recess 25 of the drilling casing 21 reaches a position slightly lower than the pile tip 26 of the tip of the buried pile 20, the straight portion 43 of the pile holding wire 23 is connected via a connecting rod 39 such as a PC steel rod. And lift it with a heavy machine 34 such as a crane at the upper end. The pile holding wire 23 is, for example, one that can withstand 20 tons, and the temporary holding material 33 is temporarily held by a wire that can be cut by about 500 kg, so that the pile holding wire 23 is heavy machine 34 When pulled up, the temporary holding member 33 is cut, and the middle portions of the plurality of suspension wires 27 are respectively drawn toward the center by the wire suspension cutouts 37, and the circular pile holding annular portion 24 is larger than the diameter of the buried pile 20. It becomes a reduced polygon. In the example of illustration, since four suspension wires 27 are used, it becomes an annular part 24 for pile holding of a substantially quadrangle.
By positioning the pile holding annular portion 24 on the side surface of the buried pile 20 in the process of FIG. 7A, it may be wound around the outer periphery of the buried pile 20 in the process of FIG. 7B. , The example will be described later.

Fig. 7 (c)
When the digging casing 21 is pulled up with the pile holding wire 23 in a state in which the pile holding annular portion 24 is squeezed, as shown in FIGS. 4 (a) and 4 (b), a polygonal pile reduced from the buried pile 20. The holding annular portion 24 is wound around and held by the conical pile tip portion 26. Connecting rod such as PC steel rod connected to the pile holding wire 23 in a state where a tensile load is applied by a heavy machine 40 such as a crane so that the pile holding ring portion 24 of the pile holding wire 23 39 is fixed to the wire guide groove 32 of the drilling casing 21 by tightening a fixing means 44 such as a PC lock nut. It is desirable that a plurality of fixing means 44 such as PC lock nuts be provided at predetermined intervals on the connecting rod 39 so that the drilling casing 21 can be tightened and fixed at a position where it protrudes to the ground.

Figure 7 (d)
The digging casing 21 is pulled up by the heavy machine 40 together with the pile holding wire 23. The drilling casing 21 is integrally fixed to the connecting rod 39 such as a PC steel rod by tightening the fixing means 44 such as a PC lock nut, so heavy machinery 40 such as a crane connected to the pile holding wire 23 The casing 21 may be pulled up, but the drilling casing 21 may be pulled up by a heavy machine different from the heavy machine 40. In this manner, the buried pile 20 is pulled out of the drilled hole 30 by the casing 21 for excavation and the pile holding wire 23. When the buried pile 20 is long, a plurality of excavating casings 21 are connected, but the excavating casing 21 is sequentially separated from the top. When separating, the connecting rod 39 is fixed to the remaining drilling casing 21 by the lower fixing means 44 and then fixed. After the excavating casing 21 in the upper part is separated, the portion pulled up to the ground of the buried pile 20 is cut by about 5 to 10 m at a time and pulled up sequentially, whereby the extraction work is smoothly performed.

In the above embodiment, the pile holding annular portion 24 of the pile holding wire 23 is wound around and held by the pile tip end 26 of the buried pile 20 and pulled out, but the pile tip end 26 of the buried pile 20 does not have a conical shape. In some cases, it may be wound around the trunk portion of the buried stake 20.
In the said Example, although the buried pile 20 showed the example of a circular cross section, as shown to Fig.6 (a), a cross section may be cross-sectional polygonal shape piles other than circular. Furthermore, it may be a cross-sectionally U-shaped pile like a channel material, a plate-like pile like a sheet pile, or the like.

In the above embodiment, the center point of the buried pile 20 and the center point of the drilling casing 21 are described to coincide with each other. However, the drilling holes 30 excavated by the drilling casing 21 can not completely coincide with each other. However, in the present invention, the pile holding annular portion 24 in the state of being stored in the wire storage recess 25 of the digging casing 21 is the center point O1 of the digging casing 21 and the buried pile 20 as shown in FIG. Since the diameter is sufficiently larger than that of the buried pile 20 even if the center point O2 is eccentric, the buried pile 20 in the excavation hole 30 can be reliably wound and held by the pile holding annular portion 24.
In the embodiment, the pile holding annular portion 24 of the pile holding wire 23 is configured to extend from one end 23a to the other end 23b at least twice, but may be three or more. However, if there are three or more turns, it is preferable that the number of turns is two because the annular portions may overlap with each other and tightening to the embedded pile 20 may be insufficient.

  DESCRIPTION OF SYMBOLS 10 ... Buried pile, 11 ... Drilling casing, 12 ... Drilling blade, 13 ... Wire, 14 ... One end groove, 15 ... Other end groove, 16 ... Lower surface part, 17 ... Drilling hole, 18 ... One end part, 19 ... Other end Part 20, Buried pile, 21: Casing for drilling, 22: Drilling blade, 23: Pile holding wire, 24: Ring for holding pile, 25: Wire storage recess, 26: Pile tip, 27: Suspension wire, 28 ... fixed part, 29 ... suspension ring, 30 ... excavated hole, 31 ... protective cover, 32 ... wire guide groove, 33 ... temporary holding material, 34 ... knot window, 35 ... fixed member, 36 ... wire pulling notch, 37 ... wire hanging notch, 38 ... connecting ring, 39 ... connecting rod such as PC steel rod, 40 ... heavy machine such as crane, 41 ... protective frame, 42 ... cylindrical body, 43 ... straight part, 44 ... PC lock nut etc. Fixing means.

Claims (8)

An excavating hole is excavated by an excavating casing around an embedding pile, and a pile holding ring of a pile holding wire is wound around the embedding pile, and the excavating pile is pulled out together with the excavation casing by a heavy machine. In
A plurality of suspension wires are suspended from the vicinity of the lower end portion of the casing for excavation to a wire storage recess provided on the inner wall surface of the casing for excavation, and the ring holding portion for piles held at least twice by the suspension wire is supported The pile holding annular portion is temporarily fixed in the wire storage concave portion, and the straight portions at both ends of the pile holding annular portion are guided to the wire guide groove of the outer periphery of the digging casing and connected to a heavy equipment on the ground The process to
Drilling a drilling hole in the drilling casing in which the pile holding wire is attached around the buried pile;
Pulling up the pile holding wire via the connecting rod with the heavy machine, squeezing the pile holding annular portion, and winding it around a buried pile;
Fixing the pile holding wire to a digging casing after winding the pile holding wire to a buried pile;
And a step of pulling out the buried pile by pulling up the pile holding wire and the casing for digging.   At least three hanging wires are provided at substantially equal intervals, and the pile holding annular portion forms a polygon when the pile holding wire is squeezed out. Method.   The extraction of the buried pile according to claim 1 or 2, characterized in that the heavy machine is connected to the straight portion of the pile holding wire via a connecting rod, and the connecting rod is fixed to the casing for excavation by a fixing means. Method.   The suspension wire is characterized in that the fixed portion at the upper end is attached to the outer surface of the casing for excavation and the suspension ring at the lower end is suspended in the wire storage recess from the wire suspension notch provided in the wire storage recess. The extraction method of the buried pile of the claim | item 1, 2 or 3. In an extraction device for an buried pile comprising a drilling casing for drilling a drilling hole around a buried pile and a pile holding wire for pulling out the buried pile together with the drilling casing by a heavy machine wound around and connected to the buried pile ,
The pile holding wire comprises a pile holding ring portion which is at least two turns for winding around the buried pile, and a straight portion in which both ends of the pile holding ring portion are extended upward, and the digging casing is A wire storage recess is provided on the inner wall near the lower end and the entire periphery for storing the pile holding annular portion is opened inward, and the drilling casing for guiding the straight portion upward And a plurality of suspension wires suspended from the casing for excavation and supporting the pile holding annular portion in the wire storage recess at the lower end portion, and the wire guide groove is provided with the wire guide grooves. An extraction device for a buried pile characterized in that fixing means are provided for fixing a winding position of the pile holding wire to the buried pile.   The tip end of the pile holding wire and a heavy machine are connected by a PC steel rod, and the fixing means comprises means for clamping and fixing a lock nut provided at a predetermined interval on the PC steel rod in the wire guide groove. The extraction device of the buried pile according to claim 5.   7. The buried pile according to claim 5 or 6, wherein the wire storage recess has a U-shaped cross section with an open inside, and a wire hanging notch on which a hanging ring of a hanging wire hangs down is provided on the upper surface. Extraction device.   The wire storage recess is provided with a knot window provided at a predetermined interval on the outer surface, and a fixing member for holding the pile holding annular portion facing the knot window. The extraction apparatus of the buried pile of 7 description.

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