JP3766676B2 - Existing pile removal method and apparatus - Google Patents

Description

  The present invention relates to an existing pile removing method and apparatus, and more particularly, to an existing pile removing method and apparatus for removing unnecessary piles buried in the ground.

  When rebuilding a building structure, it is necessary not only to dismantle and remove the old building structure, but also to remove the existing piles that are buried in the ground. Existing piles driven into the ground are firmly fixed to the ground for many years, and a huge pulling force is required to pull them out. Conventionally, when such an existing pile is pulled out and removed, the casing is rotated by an auger machine that moves up and down along the leader of the pile puller, and then the existing pile is excavated to the vicinity of its tip. A wire was tied to the upper end of the wire and pulled out by a crane.

However, the above method has a problem that the crane cannot withstand the weight of the existing pile when the length and weight of the existing pile become large. Moreover, it is necessary to make the casing attached to the pile puller and the pile puller larger, and there is a problem in that the cost required for pulling and removing the existing pile increases.
Therefore, conventionally, various existing pile removing devices and methods thereof have been proposed in order to enable drawing and removing such an existing pile having a large length and weight (see, for example, Patent Document 1).
In patent document 1, after excavating the circumference | surroundings of the existing pile with a casing, a wire saw apparatus is inserted in the space formed between the existing pile and the casing, and the existing pile is made predetermined length from the upper part with the wire saw apparatus. The existing pile removal method and its apparatus which are divided and removed by drawing are disclosed.
JP 2001-262570 A

However, the existing pile removing method and apparatus disclosed in Patent Document 1 have a disadvantage that the wire saw device only has a function of dividing the existing pile into predetermined lengths. Thereby, in order to pull out and remove the existing piles from the ground, there is a problem that it is necessary to tie a wire to the upper end portion of the existing piles and pull it out with a crane as in the past. As a result, there is a problem that the number of work steps is significantly increased as compared with the case where the existing pile is pulled out from the ground without being divided. Moreover, the operation | work which inserts a wire saw apparatus in the space formed between the existing pile and the casing also becomes a factor which increases an operation man-hour compared with the case where it pulls out from the ground as it is without dividing an existing pile.
Then, an object of this invention is to provide the existing pile removal method and its apparatus which can remove easily the existing pile which was embed | buried in the ground and whose length and weight are large.

In order to achieve the above-mentioned object, an existing pile removing apparatus according to the present invention is capable of protruding and retracting from a casing having an excavating blade for digging the periphery of an existing pile buried in the ground and an inner surface of a tip portion of the casing. An existing pile cutting blade provided at the front end portion, and an in / out drive mechanism for making the existing pile cutting blade in / out, and the in / out drive mechanism is a hydraulic pressure disposed on the upper upper surface side of the casing. The existing pile cutting blade has a cylinder and protrudes from the inner surface of the tip portion at a predetermined depth so that the existing pile can be cut from the side surface, and further, the existing pile cutting blade is cut by the existing pile cutting blade. A portion above the cutting portion is configured to be able to be pulled out from the ground together with the casing by being hooked on a receiving surface of the existing pile cutting blade protruded by the above-described protrusion and depression drive mechanism , and further, the existing pile cutting The blade is Has a rebar cutting blade for cutting reinforcing steel pile, the concrete cutting blade for cutting the concrete of the existing pile, the, iron muscle cutting blade is formed smaller than the concrete cutting blade, and, The concrete cutting blade is formed in such a size that the tip end portion is positioned in the vicinity of the center of the casing when the tip end portion is projected most from the inner surface of the casing .

  The reinforcing bar cutting blade has an arm part that can be moved in and out from the inner surface of the casing, and a rotary cutting blade pivotally attached to the tip of the arm part.

Further, two rotary cutting blades are arranged on the arm portion at a predetermined interval in the vertical direction.
Further, the existing pile cutting blade is provided with a fluid ejection hole for ejecting water or cement milk.
The casing is connected to an auger machine that moves up and down along the leader via an actuator that can be vertically expanded and contracted.

The method for removing an existing pile according to the present invention is a method of excavating to a predetermined depth with a casing having a drilling blade for digging the periphery of an existing pile buried in the ground, and can be moved up and down from the inner surface of the tip of the casing. Among the reinforcing bar cutting blades and concrete cutting blades provided at the tip part, the reinforcing bar cutting blades are moved by the retracting drive mechanism having a hydraulic cylinder arranged on the upper upper surface side of the casing . to protrude from the inner surface to cut the reinforcing bars from the side of the existing pile, the concrete cutting blade is protruded by the retractable driving mechanism from the inner surface of the front end of the casing is cut the concrete from the side of the existing pile the rebar cutting blade and the upper portion than the cut portion of the existing pile cut by the concrete cutting blade, said concrete cutting blade above that has issued collision Part is hooked in the receiving surface of the concrete cutting blade while located near the center of the casing by pulling from the ground with the casing, and divides the existing pile to a predetermined length it is obtained by enabling successively removed from the ground.

According to the existing pile removing apparatus of the present invention, it is possible to eliminate the need to separately use a crane for pulling out the divided existing piles, and to increase the length and weight without increasing the work man-hours. Pile can be removed easily.
Moreover, the existing pile cutting blade can be configured to have an optimum shape for cutting either the reinforcing bar or the concrete of the existing pile, and the work time when cutting the existing pile can be shortened. .
Moreover, the concrete of the existing pile can be easily cut by the concrete cutting blade after the reinforcing bar is cut.
In addition, when cutting an existing pile, water or cement milk is used to discharge drilling waste between the existing pile cutting blade and the existing pile to the outside of the cutting portion, and to cool the existing pile cutting blade with water or cement milk. Can act as a coolant.
In addition, the existing pile that has been separated and pulled out from the upper part in order is easily hooked with the existing pile cutting blade at the bottom of the existing pile that is easily moved and unstable. Can do .

  Moreover, according to the existing pile removing method of the present invention, it is not necessary to separately use a crane for pulling out the divided existing pile, and various existing piles having a large length and weight can be easily removed. it can.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
First, the structure of the existing pile removing apparatus according to the present invention will be described.
FIG. 1 is a side view of a pile drawing machine including an existing pile removing device according to an embodiment of the present invention.
The existing pile removing apparatus according to the present invention is an apparatus used when removing the existing pile 30 embedded in the underground G for the purpose of rebuilding a building structure or the like. The existing pile removing apparatus according to the present invention is connected to an auger machine 22 that moves up and down along a leader 21 of a self-propelled pile puller 24 via actuators 23, 23, a transition pipe 9, and the like. And the existing pile cutting blade 3 ... provided in the front-end | tip part 2a of the casing 2 and the intrusion drive mechanism 13 ... are provided.

In FIG. 2, the auger machine 22 has a drive mechanism for rotating the casing 2 (not shown).
The actuators 23, 23 are hydraulic cylinders and are disposed on both side surfaces of the auger machine 22.
An attachment frame 25 is connected to the extensible distal ends of the actuators 23 and 23. The mounting frame 25 is configured to move up and down with respect to the auger machine 22 by extending and contracting the actuators 23 and 23 in the vertical direction (the direction of arrow A in FIG. 2). That is, the vertical distance between the mounting frame 25 and the auger machine 22 can be adjusted. The vertical strokes of the actuators 23, 23 are set to 1400 mm to 1600 mm, for example.

Further, a hydraulic swivel joint 26 is disposed on the upper portion of the mounting frame 25. As shown in FIG. 1, the hydraulic swivel joint 26 includes a hydraulic line led from the hydraulic drive source 29 in the pile puller body 28 of the pile puller 24 through the reader 21 to the hydraulic swivel joint 26, A hydraulic line led from the drive mechanism 13 to the hydraulic swivel joint 26 is connected.
Further, as shown in FIG. 2, a hydraulic swivel joint 27 is disposed below the mounting frame 25. The hydraulic swivel joint 27 is connected to the hydraulic vertical line 17.

As shown in FIG. 1, the joint pipes 9 are cylindrical members having flange portions at both ends, and a plurality of them are connected in the vertical direction. The uppermost end portion of the joint pipes 9 is connected to the mounting frame 25, and the lowermost end portion of the joint pipes 9 is connected to the casing 2 via the connection pipe 16. In other words, the casing 2 is connected to the auger machine 22 that moves up and down along the leader 21 through the actuator 23 that can be vertically expanded and contracted by the joint pipes 9.
The joint pipes 9... Can adjust the vertical distance between the auger machine 22 and the casing 2 by increasing or decreasing the number of connections.
In addition, it is also preferable that the single leg tube 9 has a telescopic function. In this case, it is possible to eliminate the work of adding / removing the extension pipe 9 for adjusting the vertical distance between the auger machine 22 and the casing 2.

FIG. 3 is an enlarged side view of a main part showing a casing peripheral part of the existing pile removing apparatus according to the first embodiment of the present invention, and FIG. 4 is a bottom view thereof.
The casing 2 has a stepped cylindrical shape and has excavation blades 1 for digging around the existing pile 30 embedded in the underground G at the tip end portion 2a. The tips of the excavating blades 1 are formed in a triangular mountain shape, and a plurality of the excavating blades 1 are arranged along the outer periphery of the casing 2 at a pitch equal to the center angle in the bottom view.
In addition, the shape and arrangement position of the excavating blades 1 are not limited to those having a triangular mountain tip, or a plurality arranged at a pitch such as a central angle in a bottom view along the outer periphery of the casing 2, Other shapes are also free. For example, when rotating in the direction opposite to the arrow B direction in FIG. 4, it is also preferable that the shape of the digging blades 1.
Further, screw portions 10 are projected on the outer peripheral surface of the casing 2. The lower ends of the screw portions 10 are connected to the excavating blades 1.

Here, the existing pile cutting blades 3... Are provided so as to be able to protrude and retract from the inner surface of the distal end portion 2 a of the casing 2.
Specifically, the existing pile cutting blades 3... Are stored one by one in the cutting blade storage portions 11. It is configured. And the base end part of each existing pile cutting blade 3 is pivotally attached in the cutting blade accommodating part 11. FIG. Thus, the existing pile cutting blades 3 are provided so as to be able to protrude and retract from the inner surface of the distal end portion 2 a of the casing 2. The existing pile cutting blades 3 ... project from the inner surface of the tip 2a at a predetermined depth, and the existing pile 30 can be cut from the side surface by rotating the casing 2 in the direction of arrow B in FIG. It is said that.

  The cutting blade storage portion 11 for storing the existing pile cutting blades 3 has a pair of upper and lower strip plate portions 11a and 11a and a support column portion 11b for connecting the pair of upper and lower strip plate portions 11a and 11a to each other. . As a result, the existing pile cutting blades 3 are exposed when the casing 2 is viewed from the outside. With this structure, it is possible to prevent the inconvenience that earth and sand and excavation debris of the existing pile 30 are accumulated in the cutting blade storage portions 11... And the existing pile cutting blade 3 cannot be stored in the cutting blade storage portion 11.

The four existing pile cutting blades 3 are used to cut a pair of reinforcing bar cutting blades 4 and 4 for cutting the reinforcing bars 30a of the existing pile 30 (see FIG. 6) and the concrete 30b of the existing pile 30 (see FIG. 6). A pair of concrete cutting blades 5 and 5. The pair of rebar cutting blades 4 and 4 and the pair of concrete cutting blades 5 and 5 are arranged so that the same type is point-symmetric with respect to the center of the casing 2 in a bottom view. With this arrangement, the existing pile 30 can be cut with a good balance.
The reinforcing bar cutting blades 4 and 4 and the concrete cutting blades 5 and 5 are formed in a substantially sickle shape when viewed from the bottom. Among these, the concrete cutting blades 5 and 5 are formed in such a size that the tip end portion is located in the vicinity of the center of the casing 2 when the tip end portion protrudes most from the inner surface of the casing 2. The upper surfaces of the concrete cutting blades 5, 5 are receiving surfaces 3 a, 3 a for hooking the existing pile 30. Further, the reinforcing bar cutting blades 4 and 4 are formed smaller than the concrete cutting blades 5 and 5.

Moreover, the fluid ejection hole 8 for ejecting water or cement milk is provided in the front-end | tip part of each of the reinforcing bar cutting blades 4 and 4 and the concrete cutting blades 5 and 5.
Water or cement milk is guided to each fluid ejection hole 8 by a hydraulic pressure line 15 passed through each torque transmission pipe 12 (described later). The water pressure lines 15 are inserted into the holes 16 a of the connection pipe 16 and are connected to the water pressure upper and lower lines 17 inside the connection pipe 16.

Incidentally, already設杭cutting blade 3 ... (rebar cutting blade 4, 4 and concrete cutting blade 5, 5), rather than limited to those formed in the bottom view substantially sickle, also free other shapes is there. For example, when rotating in the direction opposite to the arrow B direction in FIG. 4, the hooked blade edge is attached to the tip of the existing pile cutting blade 3 (rebar cutting blades 4, 4 and concrete cutting blades 5, 5). It is also preferable to use a simple shape (not shown).
The existing pile cutting blades 3 (rebar cutting blades 4 and 4 and concrete cutting blades 5 and 5) are receiving surfaces 3a and 3a for hooking the existing pile 30 only on the upper surfaces of the concrete cutting blades 5 and 5, respectively. It is also preferable to provide the receiving surfaces 3a, 3a on the reinforcing bar cutting blades 4, 4.

FIG. 5 is a plan view of the casing cut along the line X-X in FIG. 3.
The intrusion drive mechanism 13 has a function of causing the existing pile cutting blades 3 to protrude from the inner surface of the casing 2. As shown in FIGS. 3 and 5, the intrusion drive mechanism 13 is disposed on the torque transmission pipe 12 connected to the rotational axis of each existing pile cutting blade 3 and the upper portion of the casing 2 and transmits each torque. And a hydraulic cylinder 20 connected to the pipe 12.
The torque transmission pipes 12 are arranged in a straight line along the outer periphery of the casing 2. Further, at the positions where the torque transmission pipes 12 intersect with the screw parts 10..., The torque transmission pipes 12 are inserted into the conduction holes 10 a provided in the screw parts 10.

The hydraulic cylinders 20 are driven by the hydraulic pressure of the hydraulic lines 14 guided from the hydraulic swivel joint 26. Four hydraulic cylinders 20 are arranged at a pitch equal to the center angle in plan view. By driving the hydraulic cylinders 20, torque is transmitted to the existing pile cutting blades 3 through the torque transmission pipes 12. And the existing pile cutting blades 3... To which the torque is transmitted by driving the hydraulic cylinders 20 are configured to abut against the side surfaces of the existing pile 30 with a predetermined pressing force .

  With the above structure, the existing pile cutting blades 3 and 3 (concrete cutting blades 5) in which the upper part of the existing pile 30 cut by the existing pile cutting blades 3. , 5) and can be pulled out from the underground G together with the casing 2 by being latched by the receiving surfaces 3a, 3a.

Next, the existing pile removal method according to the present invention will be described.
7 to 10 are cross-sectional side views for explaining a drawing and removing process of an existing pile using the existing pile removing device according to the present invention.
First, as shown in FIGS. 1 and 7, the auger machine 22 rotates the casing 2 in the direction of arrow B in FIG. 7 and lowers the casing 2 along the leader 21 (in the direction of arrow C in FIG. 7). The excavating blade 1 is used to excavate around the existing pile 30 to a predetermined depth. At this time, the excavated earth and sand are carried upward by the screw portions 10.

  Next, as shown in FIGS. 1 and 8, the descent of the casing 2 is stopped at a predetermined depth H, and the reinforcing bar cutting blades 4, 4 are projected from the inner surface of the front end portion 2 a of the casing 2. At this time, by driving the hydraulic cylinders 20, 20, the reinforcing bar cutting blades 4, 4 come into contact with the side surfaces of the existing pile 30 with a predetermined pressing force. And if the casing 2 is rotationally driven in the arrow B direction in FIG. 8, the existing pile 30 will be cut | disconnected from a side surface. At this time, since the reinforcing bar cutting blades 4 and 4 are in contact with the side surfaces of the existing pile 30 with a predetermined pressing force, the protruding amount of the reinforcing bar cutting blades 4 and 4 decreases as the diameter of the cutting portion of the existing pile 30 decreases. It will increase. Then, the reinforcing bars 30a are cut by the reinforcing bar cutting blades 4 and 4.

After the reinforcing bars 30a are cut by the reinforcing bar cutting blades 4, 4, the reinforcing bar cutting blades 4, 4 are stored in the cutting blade storage parts 11, 11 as shown in FIGS. The blades 5 and 5 are protruded from the inner surface of the front end portion 2 a of the casing 2. At this time, the concrete cutting blades 5 are brought into contact with the side surface of the existing pile 30 with a predetermined pressing force by driving the hydraulic cylinders 20 and 20.
And if the casing 2 is rotationally driven in the arrow B direction in FIG. 9, the concrete 30b of the existing pile 30 will be cut | disconnected from a side surface. At this time, since the concrete cutting blades 5 and 5 are in contact with the side surfaces of the existing pile 30 with a predetermined pressing force, the projecting amount of the concrete cutting blades 5 and 5 decreases as the diameter of the cutting portion of the existing pile 30 decreases. It will increase.
Then, the existing pile 30 is completely cut by the concrete cutting blades 5 and 5.

  Next, after complete cutting of the existing pile 30 with the concrete cutting blades 5, 5, the rotation of the casing 2 is stopped with the concrete cutting blades 5, 5 protruding from the inner surface of the tip 2 a of the casing 2 ( Under the present circumstances, the concrete cutting blades 5 and 5 are in the state which protruded from the inner surface of the front-end | tip part 2a to the maximum extent. In this state, as shown in FIGS. 1 and 10, the casing 2 is raised along the leader 21 (in the direction of arrow E in FIG. 10). At this time, among the existing piles 30 cut by the existing pile cutting blades 3..., The portions above the cutting portion (upper cutting portions 31) are projected by the existing pile cutting blades 3, 3 ( The concrete cutting blades 5, 5) are hooked on the receiving surfaces 3 a, 3 a and pulled out from the ground G together with the casing 2.

  And the upper cutting part 31 of the existing pile 30 pulled out from the underground G is taken out from the casing 2. After the upper cut portion 31 of the existing pile 30 was taken out from the casing 2, the upper cut portion 31 was pulled out in order to further divide and pull out the remaining portion 32 of the existing pile 30 remaining in the underground G. The casing 2 is inserted into the excavation hole 33 again.

By repeating the above steps, the existing pile 30 is divided into a predetermined length, sequentially taken out from the underground G, and removed.
In addition, when the length of the existing pile 30 is long and the casing 2 cannot be lowered to a predetermined depth, the extension pipe 9 is added between the auger machine 22 and the casing 2 each time.

FIG. 11 is an enlarged bottom view of the main part showing the casing peripheral part of the existing pile removing device according to the second embodiment of the present invention, and FIG. 12 is an enlarged side view of the main part of the reinforcing bar cutting blade.
In the second embodiment of the present invention, unlike the first embodiment, the reinforcing bar cutting blades 4, 4 have an arm part 6 that can be moved in and out from the inner surface of the casing 2, and a rotary cutting blade pivotally attached to the tip of the arm part 6. 7 is illustrated.
That is, in the first embodiment, the reinforcing bars 30a of the existing pile 30 are cut using the rotation of the casing 2 and the pressing force applied to the side surfaces of the existing pile 30 by the hydraulic cylinders 20 (see FIGS. 1 and 4). In the second embodiment, the rotary cutting blade 7 that is rotationally driven by the motor 19 is used to cut the reinforcing bars 30a of the existing pile 30.

The motor 19 is a hydraulic motor driven by, for example, hydraulic pressure. The rotary cutting blade 7 is formed in a disk whose outer periphery is a saw-tooth shape.
Moreover, the cutting amount with respect to the existing pile 30 of the rotary cutting blade 7 is set to 45-65 mm, for example. If the depth of cut is smaller than this, the reinforcing bars 30a of the existing pile 30 may not be completely cut. If the depth of cut is larger than this, the rebar cutting blades 4 and 4 are unnecessarily large. Component cost increases.
The rotational speed of the rotary cutting blade 7 is, for example, 800 to 1200 revolutions per minute. If the rotational speed of the rotary cutting blade 7 is smaller than this, the reinforcing bars 30a of the existing pile 30 may not be completely cut. If the cutting depth is larger than this, the rotary cutting blade 7 is easily damaged. There is a risk of doing.

FIG. 13 is an enlarged side view of a main part of a reinforcing bar cutting blade of an existing pile removing device according to a third embodiment of the present invention.
The reinforcing bar cutting blades 4, 4 according to the third embodiment of the present invention are different from the first embodiment in that the reinforcing bar cutting blades 4, 4 are movable in and out of the inner surface of the casing 2 and the tip of the arm part 6. In this example, the rotary cutting blade 7 is pivotally attached to the arm portion 6, and two rotary cutting blades 7 are arranged on the arm portion 6 with a predetermined interval L therebetween. That is, in the third embodiment, there is not one rotary cutting blade 7 as in the second embodiment, and two rotary cutting blades 7 are arranged on the arm portion 6 with a predetermined interval L in the vertical direction. It has become. The interval L is set to 140 to 160 mm, for example. If the distance L is smaller than this, when cutting the concrete 30b of the existing pile 30 with the concrete cutting blades 5 and 5, the concrete cutting blades 5 and 5 will be installed without touching the reinforcing bars 30a ... remaining in the existing pile 30. It becomes difficult to cut the concrete 30b of the pile 30.
The rebar cutting blades 4 and 4 can facilitate the cutting of the concrete 30b of the existing pile 30 with the concrete cutting blades 5 and 5 after the rebar 30a.

In the embodiment of the present invention, the existing pile removing device is connected to the auger machine 22 that moves up and down along the leader 21 of the self-propelled pile puller 24, and the actuators 23 and 23 and the anchor pipe 9. However, the present invention is not limited to this, and the present invention can be used for an existing pile removing device that is not capable of self-propelling.
Moreover, in embodiment of this invention, the part above the cutting part among the existing piles 30 cut | disconnected by the existing pile cutting blade 3 ... is made into the existing pile cutting blades 3 and 3 (concrete cutting blades 5 and 5). ) And only the receiving surfaces 3a, 3a and can be pulled out from the ground G together with the casing 2. However, the present invention is not limited to this, and in addition to the existing pile cutting blades 3 ... It is also preferable to provide latching pawls 18 that can be freely moved (see FIG. 10). When the portion above the cut portion of the cut existing pile 30 is pulled out from the underground G together with the casing 2, in addition to the receiving surfaces 3a and 3a of the existing pile cutting blades 3 and 3 (concrete cutting blades 5 and 5) Further, by pulling the existing pile 30 with the hooking claws 18, more stable drawing can be performed.

As described above, the existing pile removing apparatus according to the present invention is protruded from the casing 2 having the excavating blade 1 for digging the periphery of the existing pile 30 embedded in the underground G, and the inner surface of the tip 2a of the casing 2. An existing pile cutting blade 3 provided at the tip 2a so as to be free, and an in / out drive mechanism 13 for making the existing pile cutting blade 3 in / out, and the indent / drive mechanism 13 is an upper upper surface of the casing 2 The existing pile cutting blade 3 has a hydraulic cylinder 20 disposed on the side, and protrudes from the inner surface of the tip 2a at a predetermined depth so that the existing pile 30 can be cut from the side surface. 3, the upper part of the existing pile 30 cut by 3... Is hooked by the receiving surfaces 3 a and 3 a of the existing pile cutting blades 3 and 3 protruded by the indentation drive mechanisms 13 and 13. In addition, it can be pulled out from the underground G , and the existing pile cutting blade 3 has rebar cutting blades 4 and 4 for cutting the reinforcing bars 30a of the existing pile 30, and concrete cutting blades 5 and 5 for cutting the concrete 30b of the existing pile 30, and the reinforcing bar cutting blades 4 and 4 are formed smaller than the concrete cutting blades 5 and 5, and the concrete cutting blades 5 and 5, when the tip part protrudes most from the inner surface of the casing 2, the tip part is near the center of the casing 2. because it is formed to a size that is close to the existing pile cutting blade 3 ..., it is possible to easily divide the existing pile 30 to a predetermined length.

  In addition, the existing pile 30 is divided by being configured to be able to be pulled out from the underground G together with the casing 2 by being hooked on the receiving surfaces 3a and 3a of the existing pile cutting blades 3 and 3 (concrete cutting blades 5 and 5). Further, it is possible to eliminate the need to separately use a crane for pulling out the existing pile 30. As a result, it is possible to easily perform the work of dividing the existing pile 30 into a predetermined length and sequentially taking it out from the ground G. Therefore, various existing piles 30 having a large length and weight without increasing the number of work steps. Can be easily removed.

  Moreover, the process of excavating the circumference | surroundings of the existing pile 30 with the casing 2 by providing the existing pile cutting blade 3 ... in the front-end | tip part 2a of the casing 2, and the process of cutting the existing pile 30 with the existing pile cutting blade 3 ... Can be performed continuously. This eliminates the need to insert the cutting device for the existing pile 30 into the space formed between the existing pile 30 and the casing 2 as compared with the case where a wire saw device is used. Man-hours can be reduced. As a result, the existing pile 30 embedded in the ground and having a large length and weight can be easily removed.

  Also, the existing pile cutting blade 3... Rebar cutting blades 4, 4 for cutting the reinforcing bar 30 a of the existing pile 30, and the concrete cutting blades 5, 5 for cutting the concrete 30 b of the existing pile 30. By comprising so that the existing pile cutting blade 3 can be comprised, it can be comprised so that it may have an optimal shape, even if it cuts either the reinforcing bar 30a ... or the concrete 30b. Thereby, compared with the case where the kind of existing pile cutting blade 3 ... is single, the working time at the time of cutting the existing pile 30 can be shortened.

Further, the rebar cutting blades 4, 4 can be more easily configured by having the arm portion 6 that can be projected and retracted from the inner surface of the casing 2 and the rotary cutting blade 7 pivotally attached to the tip of the arm portion 6. It is possible to cut the reinforcing bars 30a of the existing pile 30.
Further, by arranging two rotary cutting blades 7 on the arm portion 6 with a predetermined interval in the vertical direction, the rebars 30a... Can be cut at two points apart. In addition, after the reinforcing bars 30a cut at the two upper and lower positions are ejected from the cutting portion with the concrete cutting blades 5 and 5, the concrete cutting blades 5 and 5 are installed without touching the reinforcing bars 30a remaining in the existing pile 30. The concrete 30b of the pile 30 can be cut. As a result, it is possible to easily cut the concrete 30b of the existing pile 30 with the concrete cutting blades 5, 5 after cutting the reinforcing bars 30a.

Further, by providing the existing pile cutting blade 3 with a fluid ejection hole 8 for jetting water or cement milk, when the existing pile 30 is cut, the existing pile cutting blade 3... The excavation waste between the two can be discharged out of the cutting portion, and water or cement milk can be used as a cooling liquid for cooling the existing pile cutting blades 3.
Further, by connecting the casing 2 to an auger machine 22 that moves up and down along the leader 21 via an actuator 23 that can be vertically expanded and contracted, the existing pile cutting blade 3 provided at the tip 2a of the casing 2 Fine adjustment of the vertical position can be easily performed. As a result, the existing pile 30 is divided and pulled out from the upper part one by one. The existing pile cutting blades 3, 3 (concrete) It can be easily hooked with the cutting blades 5, 5).

Moreover, according to the existing pile removing method of the present invention, the tip of the casing 2 is excavated to a predetermined depth with the casing 2 having the excavating blades 1 for digging around the existing pile 30 buried in the underground G. Of the reinforcing bar cutting blades 4 and 4 and the concrete cutting blades 5 and 5 provided at the tip 2a so as to be able to protrude and retract from the inner surface of the part 2a, the reinforcing bar cutting blades 4 and 4 are arranged on the upper upper side of the casing 2 the retractable driving mechanism 13 having the hydraulic cylinder 20 that is, to protrude from the inner surface of the distal end portion 2a to cut the reinforcing bars 30a ... from the side of the existing pile 30, a concrete cutting blade 5,5 casing 2 of the distal end portion 2a The concrete 30b is cut from the side of the existing pile 30 by protruding from the inner surface by the drive mechanism 13, and the existing pile 30 cut by the reinforcing bar cutting blades 4, 4 and the concrete cutting blades 5 , 5 is above the cutting portion. the part Receiving surface 3a of the concrete cutting blade 5,5 in a state in which concrete cutting blade 5 which has issued collision, 5 of the tip is positioned near the center of the casing 2, from the ground G with the casing 2 by hooking at 3a By pulling out, the existing pile 30 can be divided into predetermined lengths and sequentially taken out from the ground G. Therefore, it is not necessary to use a separate crane for pulling out the existing piles 30. Various existing piles that are heavy and heavy can be easily removed.

Moreover, the process of excavating the circumference | surroundings of the existing pile 30 with the casing 2, and the process of cutting the existing pile 30 with the existing pile cutting blade 3 ... can be performed continuously. This eliminates the need to insert the cutting device for the existing pile 30 into the space formed between the existing pile 30 and the casing 2 as compared with the case where a wire saw device is used. Man-hours can be reduced. As a result, the existing pile 30 embedded in the ground and having a large length and weight can be easily removed.

Also, the existing pile cutting blade 3... Rebar cutting blades 4, 4 for cutting the reinforcing bar 30 a of the existing pile 30, and the concrete cutting blades 5, 5 for cutting the concrete 30 b of the existing pile 30. By comprising so that the existing pile cutting blade 3 can be comprised, it can be comprised so that it may have an optimal shape, even if it cuts either the reinforcing bar 30a ... or the concrete 30b. Thereby, compared with the case where the kind of existing pile cutting blade 3 ... is single, the working time at the time of cutting the existing pile 30 can be shortened.

It is a side view of the pile drawing machine provided with the existing pile removal apparatus which concerns on one Embodiment of this invention. It is a principal part enlarged front view which shows an auger machine periphery part. It is a principal part expanded side view which shows the casing periphery part of the existing pile removal apparatus which concerns on 1st embodiment of this invention. It is a bottom view. It is the top view cut | disconnected along XX of FIG. It is a section top view of an existing pile. It is a cross-sectional side view for drawing-out removal process of the existing pile using the existing pile removal apparatus which concerns on this invention. It is a cross-sectional side view for drawing-out removal process of an existing pile. It is a cross-sectional side view for drawing-out removal process of an existing pile. It is a cross-sectional side view for drawing-out removal process of an existing pile. It is a principal part expanded bottom view which shows the casing periphery part of the existing pile removal apparatus which concerns on 2nd embodiment of this invention. It is a principal part enlarged side view of a reinforcing bar cutting blade. It is a principal part expanded side view of the reinforcing bar cutting blade of the existing pile removal apparatus which concerns on 3rd embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Excavation blade 2 Casing 2a Tip part 3 Existing pile cutting blade 3a Receiving surface 4 Rebar cutting blade 5 Concrete cutting blade 6 Arm part 7 Rotary cutting blade 8 Fluid ejection hole
13 Drive mechanism
20 Hydraulic cylinder
21 reader
22 auger machine
23 Actuator
30 Existing pile
30a rebar
30b Concrete G Underground

Claims (6)

A casing (2) having a digging blade (1) for digging the periphery of an existing pile (30) embedded in the ground (G), and free to protrude from the inner surface of the tip (2a) of the casing (2) An existing pile cutting blade (3) provided at the tip portion (2a), and an in / out drive mechanism (13) for making the existing pile cutting blade (3) appear and disappear,
The intrusion drive mechanism (13) has a hydraulic cylinder (20) disposed on the upper upper surface side of the casing (2),
The existing pile cutting blade (3) protrudes from the inner surface of the tip portion (2a) at a predetermined depth so that the existing pile (30) can be cut from the side surface, and further, the existing pile cutting blade (3) The part above the cutting part of the cut existing pile (30) is hooked by the receiving surface (3a) of the existing pile cutting blade (3) protruded by the above-described intrusion drive mechanism (13). It is configured so that it can be pulled out from the ground (G) together with the casing (2) ,
Further, the existing pile cutting blade (3) cuts the reinforcing bar cutting blade (4) for cutting the reinforcing bar (30a) of the existing pile (30) and the concrete (30b) of the existing pile (30). A concrete cutting blade (5), the reinforcing steel cutting blade (4) is formed smaller than the concrete cutting blade (5), and the concrete cutting blade (5) The existing pile removing device, wherein the tip is formed in a size that is located near the center of the casing (2) when the tip is most protruded from the inner surface of 2) . The reinforcing bar cutting blade (4) has an arm part (6) which can be moved in and out from the inner surface of the casing (2), and a rotary cutting blade (7) pivotally attached to the tip of the arm part (6). The existing pile removal apparatus of Claim 1 . 3. The existing pile removing device according to claim 2, wherein two rotary cutting blades (7) are arranged on the arm portion (6) at a predetermined interval in the vertical direction. The existing pile cutting device according to claim 1, 2 or 3, wherein the existing pile cutting blade (3) is provided with a fluid ejection hole (8) for ejecting water or cement milk. The casing (2) the reader auger machine (22) for lifting along the (21), the telescopic upper and lower actuator according to claim 1, 2, 3 or 4 wherein are connected via a (23) Existing pile removal device. Excavating to a predetermined depth with a casing (2) having an excavating blade (1) for digging around the existing pile (30) buried in the ground (G),
Of the reinforcing bar cutting blade (4) and the concrete cutting blade (5) provided at the leading end (2a) so as to be able to protrude and retract from the inner surface of the leading end (2a) of the casing (2), the reinforcing bar cutting blade ( 4) is projected from the inner surface of the tip end portion (2a) by an intrusion drive mechanism (13) having a hydraulic cylinder (20) disposed on the upper upper surface side of the casing (2), and the existing pile (30 rebar (30a) cut from the side of)
The concrete cutting blade (5) is protruded from the inner surface of the tip end portion (2a) of the casing (2) by the intrusion drive mechanism (13) to cut the concrete (30b) from the side surface side of the existing pile (30). And
The upper portion from the cut portion of the reinforcing bar cutting blade (4) and the existing pile (30) cut by the concrete cutting blade (5), the tip of the concrete cutting blade which has issued collision (5) and engaging in abutment (3a) of the casing the concrete cutting blade in a state where the center was located in the vicinity of (2) (5), by pulling from the ground (G) with the casing (2) , existing pile removing method being characterized in that it possible successively removed from the ground (G) by dividing the existing pile (30) to a predetermined length.

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