JP2007146629A - Underground pile cutting device and underground pile cutting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the amount of cutting to reduce the consumed amount of an underground pile cutting tool. <P>SOLUTION: This underground pile cutting device 10 comprises a support device 11 arrangeable within an excavation space 2 formed around an underground pile 1, and the underground pile cutting tool 12 supported to the support device 11 to cut the outer peripheral surface of the underground pile 1. The underground pile cutting tool 12 is supported to rotate integrally with the support device 11, and a rotational driving device 13 is provided for rotating the support device in a suitable height position in the excavation space 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pile buried in the ground for construction of a building foundation or ground improvement (hereinafter referred to as an underground pile) for replacement of a building, new ground improvement, etc. The present invention relates to an apparatus and a method for cutting to a length that facilitates removal of underground piles when removing from underground.

  As a method of removing the underground pile, a method is known in which the entire underground pile is lifted by a crane after excavating the periphery of the underground pile. However, this method cannot be lifted when the weight of the entire underground pile exceeds the allowable lifting weight of the crane.

Therefore, Patent Document 1 proposes a technique for cutting an underground pile into a length that can be lifted by a crane. Specifically, a casing having a larger diameter than the underground pile is arranged around the underground pile, and a wire saw device having a wire saw is inserted into a space between the casing and the underground pile, and the wire saw device It is made to take out the underground pile by cutting it to the length that can be pulled up.
JP 2001-262570 A

However, the conventional technique proposed in Patent Document 1 has the following problems.
(1) For cutting with a wire saw, press a part of the wire saw that travels in an endless manner on the cutting start point on the outer peripheral surface of the underground pile in an arc shape, and then cut the arc cutting portion with the wire saw. This is a cutting mode that advances from the cutting start location toward the cutting end location on the opposite side. However, in this cutting mode, in order to cut all the vertical reinforcing bars arranged near the outer periphery of the underground pile, it is necessary to cut substantially the entire cross section of the underground pile, and the amount of cutting increases. As described above, in the prior art in which the amount of cutting increases, there is a problem that the amount of consumption of the wire saw and the plurality of guide pulley devices increases.

(2) The wire saw device is attached to the frame-shaped gantry placed in the space between the casing and the underground pile, the endless wire saw, and the upper and lower parts of the gantry respectively, and guides the wire saw A plurality of guide pulley devices, and a drive device that is installed on the ground and runs the wire saw. However, this wire saw device has a complicated structure in which an endless wire saw is guided to a plurality of guide pulley devices, so a part of the endless wire saw is pressed against an underground pile and applied to a ground drive device. It took a lot of work and time to connect the endless wire saws in a stretched state, leading to a reduction in work efficiency.

  This invention provides the underground pile cutting device for solving the said problem.

  In order to reduce the amount of cutting and reduce the consumption of the cutting tool for underground piles, the means adopted by the invention according to claim 1 is a support device that can be arranged in an excavation space formed around the outer periphery of the underground pile. An underground pile cutting device comprising an underground pile cutting tool that is supported by the support device to cut the outer peripheral surface of the underground pile, and the underground pile cutting tool is supported so as to rotate integrally with the support device. An underground pile cutting device comprising a rotation drive device that rotates a support device at an appropriate height position in an excavation space.

  In order to make the underground pile cutting tool a simple structure, the means adopted by the invention according to claim 2 is that the underground pile cutting tool includes a cutting tool main body supported by the support device in a horizontally swingable manner. The underground pile cutting apparatus according to claim 1, further comprising: an urging unit that urges the cutting tool main body for cutting.

  In order to improve the efficiency of the work of cutting a plurality of locations by providing appropriate intervals in the longitudinal direction of the underground pile, the means adopted by the invention of claim 3 is characterized in that the underground pile cutting tool is the cutting tool main body. The underground pile cutting device according to claim 2, further comprising a retreating device that forcibly retracts a cutting position from a cutting position for cutting an outer peripheral surface of the underground pile to a standby position in the excavation space.

  The means adopted by the invention according to claim 4 is to provide a plurality of blade portions in order to enable quick cutting at a plurality of locations by providing appropriate intervals in the longitudinal direction of the underground pile. A flexible linear cutting tool main body and a linear cutting tool main body supported by the support device and wound in a horizontal arc around the outer peripheral surface of the underground pile from a standby position in the excavation space. It is an underground pile cutting device of Claim 1 provided with the guidance device guided to between cutting positions.

  In order to smoothly change the tension state of the linear cutting tool main body between the standby position and the cutting position, the means adopted by the invention according to claim 5 is such that the guide device is freely rotatable with respect to the support device. Supported part in which an underground pile penetration space is formed inside, a forward / reverse drive device for forward / reverse rotation of the supported part, and the linear cutting tool body is stretched on the supported part And the tension state of the linear cutting tool main body is changed between the standby position outside the supported portion and the cutting position inside the supported portion in accordance with the forward and reverse rotation of the supported portion. It is an underground pile cutting device of Claim 4 provided with the tension apparatus made to make. In addition, in order to avoid a collision with an underground pile and to protect the tension device, the tension device may be disposed between the support device and the supported portion.

  In order to smoothly guide the linear cutting tool main body, the means adopted by the invention according to claim 6 is characterized in that the supported portion is configured such that the standby surface portion with which the linear cutting tool main body in the standby position abuts is an outer peripheral surface. The underground pile cutting device according to claim 5, wherein a passage portion through which the linear cutting tool main body that changes a tension state between the standby position and the cutting position passes is formed. .

  In order to facilitate the change of the tension state of the linear cutting tool main body, the means adopted by the invention according to claim 7 is that the tensioning device stretches the linear cutting tool main body to the supported portion. Positioned at one end of the stretching region to be mounted and fixed to the support device to fix one end of the linear cutting tool body, and to the other end of the stretching region connected to the support device And a guide part that movably guides the middle of the linear cutting tool body, and is connected to the supported part and located between both ends of the stretch region, and between the standby position and the cutting position. 7. A tension state changing means comprising: a guiding portion for guiding the linear cutting tool main body and guiding the linear cutting tool main body horizontally with the fixed connecting portion. It is an underground pile cutting device.

  In order to facilitate the change of the tension state of the linear cutting tool main body, the means adopted by the invention of claim 8 is that the tensioning device stretches the linear cutting tool main body to the supported portion. It is located at one end of the spanning area to be mounted, and is connected to the supported part to fix one end of the linear cutting tool body, and guides the linear cutting tool body between the standby position and the cutting position A guiding portion that is located at the other end of the stretch region, is connected to the supported portion, and is movably guided in the middle of the linear cutting tool body, and is connected to the supporting device and is connected to the supporting device. Located between both ends of the stretching region, and having an intermediate guide part that guides the middle part of the linear cutting tool body in a freely movable manner and horizontally stretches the linear cutting tool body between the guiding part and the guide part. It is an underground pile cutting device of Claim 6 provided with a tension state change means.

  In order to make the change of the tension state of the linear cutting tool main body smooth, the means adopted by the invention according to claim 9 is that the supported portion has a tension between the standby position and the cutting position. Forming a passage portion through which the linear cutting tool main body that changes the state passes, and the stretching device is positioned at one end of a stretching region that stretches the linear cutting tool main body on the supported portion. A fixed connecting portion that is connected to the support device to fix one end of the linear cutting tool body, and is located at the other end of the stretch region, and is connected to the supported portion of the linear cutting tool body. A guide part that guides the middle of the movable body, a guide part that is connected to the supported part and is positioned between both ends of the stretched region, and a fixed joint part that guides the middle part of the linear cutting tool body so as to be movable; 6. The underground pile cutting device according to claim 5, further comprising a tension state changing means having a guide portion for horizontally stretching the linear cutting tool main body between the two. That.

  In order to facilitate the change of the tension state of the linear cutting tool main body, the means adopted by the invention of claim 10 is characterized in that the supported portion has a tension between the standby position and the cutting position. Forming a passage portion through which the linear cutting tool main body that changes the state passes, and the stretching device is positioned at one end of a stretching region that stretches the linear cutting tool main body on the supported portion. , Connected to the supported part to fix one end of the linear cutting tool body, and to guide the linear cutting tool body between the standby position and the cutting position, and to the other end of the stretch region Then, the linear cutting tool body is horizontally stretched between the guide unit that is connected to the support device and movably guides the middle of the linear cutting tool body, and the guide device that is connected to the support device. It is an underground pile cutting device of Claim 5 provided with the tension state change means which has an intermediate | middle guide part.

  In order to stably apply the winding tension of the linear cutting tool main body with a simple structure, the means adopted in the invention of claim 11 is that the stretching device is a free end of the linear cutting tool main body. It is an underground pile cutting device of any one of Claims 5-10 provided with the tension | tensile_strength provision means which connects a weight to the other end used as this, and provides the weight of a weight to the said linear cutting tool main body. .

  In order to efficiently perform excavation work and underground pile cutting work, the means adopted by the invention of claim 12 is formed by a casing for excavation provided with an excavating blade on the tip side, It is an underground pile cutting device of any one of Claims 1-11 using the casing drive device which rotates this casing for excavation as the said rotation drive device.

  In order to reduce the amount of cutting and reduce the amount of wear of the cutting tool for underground piles, the means adopted in the invention of claim 13 forms an excavation space around the underground pile and is arranged in the excavation space. In the underground pile cutting method of cutting the outer peripheral surface of the underground pile with the underground pile cutting tool, a support device that supports the underground pile cutting tool and is disposed at an appropriate height position in the excavation space. An underground pile cutting method, characterized in that the entire circumference of the outer peripheral surface of the underground pile is continuously cut by the underground pile cutting tool that rotates and rotates together with the support device.

  The means adopted by the invention according to claim 14 is provided with a large number of blade portions as the cutting tool for underground piles so that a plurality of places can be quickly cut by providing appropriate intervals in the longitudinal direction of the underground piles. Between the waiting position in the excavation space and the cutting position where the linear cutting tool body having flexibility is wound around the outer peripheral surface of the underground pile in a horizontal arc shape by the guide device supported by the support device. A cutting process in which the linear cutting tool main body guided to the cutting position is rotated together with the support device to perform the cutting, and the linear cutting tool main body guided to the standby position is excavated together with the support device. The underground pile cutting method according to claim 13, wherein the moving step of lowering the space and moving to the next cutting position is repeated alternately.

  In order to reduce the rotational force required for cutting, the means adopted by the invention according to claim 15 is that the excavation space is formed by rotating an excavation casing provided with an excavation blade on the tip side around the outside of the underground pile. The underground pile cutting method according to claim 13 or 14, wherein the excavation space is pushed into the ground and the inside of the excavation space is made into a space formed between the excavation casing and the underground pile.

  The underground pile cutting apparatus according to claim 1 is configured such that when the support device arranged at an appropriate height position in the excavation space is rotated by the rotation driving device, the underground pile cutting tool rotating together with the support device is Since it is a cutting form that continuously cuts the entire circumference of the outer peripheral surface, an annular groove with the minimum depth required to cut the vertical reinforcing bar arranged near the outer periphery of the underground pile is cut. Therefore, it is possible to obtain a cutting state in which an inner non-cutting portion that is easily cut and separated without a vertical reinforcing bar is left, and a cutting amount can be reduced as compared with a conventional apparatus that does not leave a non-cutting portion. As a result, the underground pile cutting apparatus of the present invention can reduce the consumption of the underground pile cutting tool by reducing the cutting amount.

  The underground pile cutting apparatus according to claim 2 is configured to rotate the horizontally swingable cutting tool main body supported by the support apparatus together with the support apparatus while urging the cutting body with the urging means toward the outer peripheral surface of the underground pile. It is possible to cut the entire circumference of the outer peripheral surface of the underground pile, and it is possible to make a cutting tool for underground pile with a simple structure consisting of a combination of a horizontally swingable cutting tool body and biasing means It becomes.

  The underground pile cutting device according to claim 3 is a height at which the cutting tool for the underground pile in the standby state is next cut together with the support device after the cutting tool body having been cut is retracted to the standby position by the retracting device. It is possible to descend to a position and resume the next cutting, and the efficiency of the work of cutting a plurality of locations can be improved.

  In the underground pile cutting device according to claim 4, the linear cutting tool main body guided to the cutting position by the induction device is wound around the outer peripheral surface of the underground pile in an arc shape, and then the rotation drive device is driven together with the support device. When the linear cutting tool main body rotates, the entire circumference of the outer peripheral surface of the underground pile can be cut with a large number of blade parts of the cutting tool main body, and after cutting, the linear cutting tool main body is moved to the standby position by a guidance device. Guide the ground pile cutting tool in the standby state together with the support device to the next vertical cutting position along the vertical direction, and then continue linear cutting to the cutting position with the guidance device as described above. Since the tool body can be guided, a plurality of underground piles can be cut quickly, and the efficiency of cutting the plurality of places can be dramatically improved.

  The underground pile cutting device according to claim 5 smoothly changes the tension state of the linear cutting tool main body between the standby position and the cutting position with the tension device as the supported portion rotates forward and backward. be able to.

  The underground pile cutting device according to claim 6 stably holds the linear cutting tool body at the standby position on the standby surface portion of the outer peripheral surface of the supported portion, and the linear cutting tool at the passage portion of the supported portion. By passing the main body, the stretch state of the linear cutting tool main body can be smoothly changed between the standby position and the cutting position.

  The underground pile cutting device according to claim 7 is configured to rotate a supported portion by a guide portion that connects a linear cutting tool main body stretched on a support device via a fixed connecting portion and a guide portion to the supported portion. Accordingly, since the guide is guided between the standby position and the cutting position, the stretched state of the linear cutting tool main body can be smoothly changed from the standby state to the cutting state.

  The underground pile cutting apparatus according to claim 8 is configured to cut a linear cutting tool main body stretched on a supported part via a guide part and a guide part at a standby position and a cutting position at the guide part as the supported part rotates. Since it guide | induces between positions, the tension state of a linear cutting tool main body can be changed smoothly from a standby state to a cutting state.

  The underground pile cutting apparatus according to claim 9 is configured such that a linear cutting tool main body stretched between a supported part and a supporting apparatus via a fixed connecting part and a guide part is provided as the supported part rotates. This allows the passage part of the supported part to pass through and the tension state of the linear cutting tool body can be smoothly changed from the standby state to the cutting state.

  The underground pile cutting device according to claim 10 is configured such that a linear cutting tool main body stretched between a supported portion and a supporting device via a guide portion and a guide portion is provided along with the rotation of the supported portion. It is possible to smoothly change the tension state of the linear cutting tool main body from the standby state to the cutting state by passing the passing portion of the supported portion by guidance.

  The underground pile cutting device according to claim 11 has a simple structure in which weights are connected, and can apply winding tension suitable for cutting to a linear cutting tool body, so that stable cutting and linear The life of the cutting tool body can be extended.

  The underground pile cutting apparatus according to claim 12 is configured to push an excavation casing while rotating with a casing drive device to form an excavation space necessary for underground pile cutting work around the underground pile, When the cutting tool has reached the appropriate height position, stop pushing the excavation casing and turn it only to rotate, so that the underground pile cutting tool rotating with the excavation casing can The entire circumference can be cut continuously, and the excavation work and the underground pile cutting work are made into a series, so that both work can be efficiently performed without causing a dead time.

  In the underground pile cutting method according to claim 13, when the support device arranged at an appropriate height in the excavation space is rotated, the underground pile cutting tool rotating together with the support device is provided on the outer peripheral surface of the underground pile. Since the entire circumference is cut continuously, the vertical rebar is formed by cutting an annular groove with the minimum depth required to cut the vertical rebar located near the outer periphery of the underground pile. It is possible to achieve a cutting state in which an inner non-cutting portion that is easy to be cut and separated without the presence of a non-cutting portion is left, and the cutting amount can be reduced as compared with a conventional method that does not leave a non-cutting portion. As a result, the underground pile cutting method of the present invention can reduce the consumption of the underground pile cutting tool by reducing the amount of cutting.

  The underground pile cutting method according to claim 14 is capable of rapidly cutting a plurality of portions of the underground pile by alternately repeating the cutting step and the moving step, and dramatically improving the efficiency of the work of cutting the plurality of portions. Can be improved.

  In the ground pile cutting method according to claim 15, since the support device is disposed between the underground pile and the excavation casing and is not subjected to earth pressure, the rotational force necessary for cutting (the force for rotating the support device) ) Can be reduced.

  An underground pile cutting device (hereinafter referred to as “the present invention cutting device”) according to the present invention will be described based on an embodiment shown in the drawings.

(First embodiment)
1 to 3 show a first embodiment of the cutting device of the present invention, and FIG. 1 shows an intermediate state before starting cutting on the underground pile 1 after excavating the outside of the underground pile 1. FIG. 2 is an enlarged front sectional view, FIG. 3 is a plan sectional view showing each state of the underground pile cutting tool, and (A) is an illustration of the underground pile cutting tool 12. A standby state is shown, (B) shows a state immediately before starting cutting with the underground pile cutting tool 12, and (C) shows a state in which the underground pile 1 is being cut with the underground pile cutting tool 12. It is shown.

  As shown in FIG. 1, the cutting device 10 of the present invention is supported by a support device 11 that can be disposed in an excavation space 2 formed around the underground pile 1, and is supported by the support device 11 and rotates integrally with the support device 11. Then, the underground pile cutting tool 12 that cuts the entire periphery of the outer peripheral surface of the underground pile 1 and the rotational drive that rotates the support device 11 together with the underground pile cutting tool 12 at an appropriate height position in the excavation space 2. Device 13.

  The support device 11 is formed by a part of the cylindrical excavation casing 14 so as to be integrated with the excavation casing 14 and continuously excavating the underground pile 1 after excavating the excavation space 2. So that the work efficiency can be improved. Further, the support device 11 is provided with a work port 11a so that when it is lifted to the ground, work and inspection from the outside can be performed. The excavation casing 14 includes an upper extension portion 14a, an intermediate portion 14b forming the support device 11, and a tip portion 14c provided with a plurality of excavation blades 15 on the tip (lower end) side. It is connected so as to be separable so that the rotational driving force can be transmitted from the upper extension portion 14a to the tip portion 14c. The excavation casing 14 includes a mud discharge spiral blade 16 on the outer peripheral surface of each of the portions 14a to 14c, and is configured so that mud generated by excavation of the excavation blade 15 can be pushed up by the spiral blade 16 and discharged to the ground. . The extended portion 14a above the excavating casing 14 is extended by adding casings of a certain length one after another as excavation progresses. As shown in FIG. 2, the tip portion 14 c of the excavation casing 14 is provided with an eccentricity prevention portion 17 made of a roller or the like, while the excavation blade 15 scrapes off the protruding portion 1 a that partially protrudes the underground pile 1. When advancing excavation, it can be pushed by the reaction force applied to the excavating blade 15 from the projecting portion 1a and prevented from being eccentric by the eccentricity preventing portion 17, and the excavation can be advanced along the longitudinal direction of the underground pile 1 It can be done.

  As shown in FIG. 3, the underground pile cutting tool 12 includes a cutting tool body 19 that is supported 18 so as to be swingable horizontally on the support device 11 (in this example, an intermediate portion 14 b of the excavating casing 14), and a cutting tool. An urging means 20 for urging the tool main body 19 for cutting, and a retreating device for forcibly retracting the cutting tool main body 19 from the cutting position to a standby position in the excavation space 2 (position shown in FIG. 3A). 21. The cutting tool body 19 is formed in a plate shape having an arc shape and an appropriate thickness in a planar shape, and a blade portion 22 made of diamond, cemented carbide or the like is attached to the inner center side, and the outer periphery of the underground pile 1 is covered by the blade portion 22. It is supposed to cut. The underground pile cutting tool 12 is not limited to one, and although not shown, a plurality may be provided at equal intervals in the circumferential direction of the support device 11. If comprised in this way, while reducing the cutting load of the cutting tool 12 for underground piles and extending the lifetime of the blade part 22, the underground pile which arises when cutting the underground pile 1 Since the reaction force from 1 can be dispersed by the plurality of underground pile cutting tools 12 and transmitted to the support device 11, the eccentricity of the support device 11 can be prevented.

  The urging means 20 includes a rope 23 connected to the swinging tip side of the cutting tool body 19 and a tension device 24 that pulls the rope 23 in an extendable manner, and the rope 23 is pulled by the tension device 24 to be contracted. The cutting tool main body 19 is moved in a direction (arrow A direction) for pressing the blade portion 22 against the outer peripheral surface of the underground pile 1. The tensioning device 24 is formed by winding the end of the rope 23 around a hydraulic or pneumatic hoisting machine, or the end of the rope 23 at the tip of a telescopic rod of a hydraulic or pneumatic cylinder or the like. What was connected etc. can be employ | adopted.

  The retracting device 21 is made of an elastic body such as a vine spring or a leaf spring disposed on the support 18 side of the cutting tool main body 19 and urges the cutting tool main body 19 in the standby direction (arrow B direction). When the urging means 20 releases the urging in the direction of arrow A, the cutting tool main body 19 is forcibly retracted from the cutting position to the standby position in the excavation space 2. The biasing means 20 and the retracting device 21 may be formed integrally. For example, a hydraulic or pneumatic cylinder that expands and contracts in the direction in which the blade portion 22 is pressed (arrow A direction) and the standby direction (arrow B direction) is connected between the cutting tool body 19 and the support device 11. Then, a hydraulic or pneumatic torque actuator for transmitting torque to a swinging support shaft provided integrally with the cutting tool body 19 so as to be able to rotate forward and backward is attached to the support device 11 and the cutting tool body 19 is pressed. It is also possible to swing in the direction (arrow A direction) and the standby direction (arrow B direction) with a torque actuator.

  As shown in FIG. 1, the rotary drive device 13 includes a reader 25 and a drive motor 26 such as a hydraulic motor guided by the reader 25 so as to be movable up and down, and an output portion 26a of the drive motor 26 is connected to the excavation casing. 14 is detachably connected to the upper end of the extended portion 14a.

Next, a method for cutting and removing the underground pile 1 using the cutting device 10 of the present invention will be described.
(1) 1st process (preparation process): The earth and sand around the head of the underground pile 1 are removed, and the pile head 1b is exposed. Next, the excavation casing 14 provided with the support device 11 and the underground pile cutting tool 12 is connected to the rotation drive device 13 and suspended, and the pile head 1b is externally fitted at the tip portion 14c to prepare.

(2) Second step (excavation step): The excavating casing 14 is pushed into the ground while being rotated by the activated rotation driving device 13, and the outer periphery of the underground pile 1 is excavated by the excavating blade 15 of the tip portion 14c. Then, the excavation space 2 is formed around the underground pile 1. Sediment generated by excavation is pushed up by the spiral blade 16 of the excavation casing 14 and discharged to the ground. If excavation by the excavation casing 14 causes the underground pile cutting tool 12 supported by the support device 11 integrated with the excavation casing 14 to reach an appropriate height in the ground, the excavation casing 14 Stop pushing and finish excavation. During excavation, the underground pile cutting tool 12 supported by the support device 11 is stopped at the standby position in the excavation space 2 (the position shown in FIG. 3A), and the underground pile 1 is grounded. The middle pile cutting tool 12 is prevented from colliding.

(3) Third step (cutting step): The cutting tool of the support device 11 integrated with the excavation casing 14 while rotating the excavation casing 14 in the suspended state by stopping the pushing by the rotation drive device 13. The main body 19 is moved from the standby position toward the underground pile 1 by the biasing means 20 to press the blade portion 22 against the outer peripheral surface of the underground pile 1, and the support device 11 (excavation casing 14 is moved around the outer periphery of the underground pile 1. ) And the cutting tool main body 19 that rotates together with the cutting tool body 19 continuously cuts the outer peripheral surface of the underground pile 1 over the entire circumference to form an annular groove 27 (see FIG. 3C) that opens sideways. This cutting is a depth at which the longitudinal reinforcing bars 28 arranged near the outer periphery of the underground pile 1 are cut, up to a state in which the non-cutting portion 1c on the inner side where the longitudinal reinforcing bars 28 do not exist and which is easily cut and separated is left. Do. As described above, the cutting device 10 of the present invention rotates the horizontally swingable cutting tool main body 19 supported by the support device 11 together with the support device 11 (excavation casing 14) while being urged by the urging means 20. Therefore, since it can cut over the entire periphery of the outer peripheral surface of the underground pile 1, it is possible to have a simple structure composed of a combination of a horizontally swingable cutting tool body 19 and a biasing means 20. Become. Furthermore, the cutting device 10 according to the present invention can be in a cutting state in which the inner non-cutting portion 1c that does not have the vertical reinforcing bar 28 is easily cut and separated, and is cut as compared with the conventional device that does not leave the non-cutting portion 1c. The amount can be reduced. As a result, the cutting device 10 of the present invention can reduce the consumption of the blade portion 22 of the underground pile cutting tool 12 by reducing the cutting amount.

(4) Fourth step (cutting / separating step): When the cutting is completed, the rotational drive of the rotary drive device 13 is stopped to stop the rotation of the excavating casing 14, and the cutting tool main body by the biasing means 20 is used. 19 is released, and the cutting tool main body 19 is forcibly retracted from the cutting position to the standby position in the excavation space 2 by the retracting device 21. Next, an interval widening device (not shown) made of a hydraulic cylinder or the like is inserted between the vicinity of the head 1b of the underground pile 1 and the casing 14 for excavation, and the vicinity of the head 1b of the underground pile 1 is moved to one side. By pressing, a large bending moment is generated in the inner non-cutting portion 1c where the vertical reinforcing bars 28 are not present, thereby cutting the non-cutting portion 1c. Finally, the ground surface side portion of the underground pile 1 cut and separated is pulled out using a crane or the like and removed from the ground to the ground.

(5) Fifth step (moving step): When cutting and separating the underground pile 1 at a position deeper than the portion removed by cutting and separating, the cutting device 10 of the present invention is the cutting tool main body after cutting. After the 19 is moved back to the standby position by the retreating device 21, the ground pile cutting tool 12 in the standby state is lowered together with the support device 11 to the height of the next cutting position.

(6) Sixth step (repeated excavation step to cutting / separation step): Repeat the second step, the third step, the fourth step and the fifth step in this order, as appropriate, so that the entire underground pile 1 is removed. Eliminate to the ground. In the second process to be repeated, when the height dimension of the excavating casing 14 is insufficient, excavation is performed by adding a new extension portion 14a to the upper extension portion 14a. In the cutting device 10 of the present invention, the cutting tool main body 19 that has been cut is retracted to the standby position by the retracting device 21, and then the underground pile cutting tool 12 in the standby state is moved together with the support device 11 to the height of the next cutting position. It is possible to lower and resume the next cutting, and the efficiency of the work of cutting a plurality of locations can be improved.

(7) Seventh step (post-cleaning step): If all the underground piles 1 are removed to the ground, the excavating casing 14 is pulled out from the ground, and if necessary, the holes after removing the underground piles are filled. Return and complete the work.

  In addition, the said 5th process and 6th process may be abbreviate | omitted and cutting and separation of the underground pile 1 may be made into one place.

(Second Embodiment)
4 thru | or 12 shows 2nd Embodiment of this invention cutting device, FIG. 4 is before starting the cutting with respect to the outer peripheral surface of the underground pile 1 after excavating the outer side of the underground pile 1. 5 is an enlarged front sectional view showing the state of FIG. 5, and FIG. 5 is an enlarged view of a main part before the cutting of the underground pile 1 is started (a linear cutting tool body 32 is wound around the underground pile 1. 6 is a front cross-sectional view showing the main part further enlarged and showing the same state, and FIG. 7 is a standby state of the underground pile cutting tool 31 (underground pile 1). FIG. 8 is a perspective view showing a state in which the linear cutting tool main body 32 is not wound around (however, the underground pile 1, the support device 11, and the guide rail 35 are indicated by two-dot chain lines. 8 is a perspective view showing a state in the middle of winding the linear cutting tool body 32 around the underground pile 1, and FIG. FIG. 10 is a perspective view showing the middle of cutting with a linear cutting tool body 32 around which the intermediate pile 1 is wound, FIG. 10 is a view corresponding to each of FIG. 7 to FIG. FIG. 11 is an enlarged plan sectional view showing a cutting state in which a non-cutting portion 1c capable of cutting and separating the underground pile 1 is left, and FIG. 12 is a supported view. The front view which expanded the part 36 is shown, Comprising: The figure (A) shows the standby state which is not winding the linear cutting tool main body 32 on the underground pile 1, and the figure (B) is linear cutting A cutting state in which the tool body 32 is wound around the underground pile 1 is indicated by a solid line.

  As shown in FIG. 4, the inventive device 30 according to the present embodiment is supported by the support device 11 that can be disposed in the excavation space 2 formed around the underground pile 1, and is supported by the support device 11. The underground pile cutting tool 31 that rotates integrally with the pile 11 to cut the outer circumferential surface of the underground pile 1 to form an annular groove, and the support device 11 at an appropriate height in the excavation space 2 And a rotary drive device 13 that rotates together with the pile cutting tool 31. As the underground pile cutting tool 31, a flexible linear cutting tool body 32 (see FIG. 5) provided with a large number of blade portions. It is characterized by its use. This linear cutting tool main body 32 is selected when a wire saw (that is, a diamond wire for cutting that is a strong cutting edge is fixed to a steel wire at regular intervals) used when cutting a concrete structure or the like. Since it is easy to obtain and is easily deformable due to its flexibility, the cutting position where it is wound around the outer peripheral surface of the underground pile 1 from the standby position (see FIG. 7) that is not wound around the outer peripheral surface of the underground pile 1 It can be easily moved to (see FIG. 9), and has an easy-to-handle aspect.

  As shown in FIG. 5, the support device 11 is different from the first embodiment in that an annular guide rail 35 projecting inwardly is provided on the inner peripheral surface of the underground pile cutting tool 31. This is to support a supported portion 36 of the guidance device 33 to be described later so as to be rotatable forward and backward. Further, as shown in FIG. 4, the rotational drive device 13 includes a reader 25 and a drive motor 26 composed of a hydraulic motor guided by the reader 25 so as to be movable up and down, as in the first embodiment. The output portion 26a of the drive motor 26 is detachably connected to the upper end of the extended portion 14a above the excavation casing 14 (the support device 11 is formed in a part thereof).

  As shown in FIGS. 5 and 6, the underground pile cutting tool 31 includes the linear cutting tool main body 32 and a guide device 33 that is supported by the support device 11 and guides the cutting tool main body 32. Yes. The underground pile cutting tool 31 rotates the supported portion 36 of the guide device 33 forward and backward so that the linear cutting tool main body 32 is not wound around the outer peripheral surface of the underground pile 1 in the excavation space 2. Underground pile 1 through a state (see FIG. 8 and FIG. 10B) in the middle of being wound around the outer peripheral surface of underground pile 1 from the standby position (see FIG. 5, FIG. 7 and FIG. 10A) Is guided to a cutting position (see FIG. 9 and FIG. 10C) that is wound horizontally and arcuately on the outer peripheral surface of the steel sheet.

  As shown in FIGS. 5 and 6, the guide device 33 includes a supported portion 36 that is rotatably supported by the annular guide rail 35 provided in the support device 11, and a supported portion 36 that rotates forward and backward. The linear cutting tool main body 32 is stretched around the supported part 36 and the supported part 36, and the linear cutting tool main body 32 is moved from the standby position to the cutting position as the supported part 36 rotates forward and backward. And a tensioning device 48 that changes the state of the tensioning. The supported portion 36 forms a underground pile penetration space on the inner side and has a cylindrical shape that forms a standby surface portion 38 with which the linear cutting tool body 32 at the standby position abuts on the outer peripheral surface. A passage portion 37 through which a linear cutting tool main body 32 that changes the state of the stretch between the cutting position and the cutting position passes is provided. The passing portion 37 of the present example is formed in a slit extending horizontally along the circumferential direction on a part of the outer peripheral surface of the supported portion 36, and the linear cutting tool main body 32 is moved from the standby position to the cutting position. It is provided to pass when moving to. The size of the passage part 37 is such that the linear cutting tool main body 32 that enters the passage part 37 and is horizontally stretched can be wound around the outer peripheral surface of the underground pile 1 and cut. . The standby surface portion 38 is formed in an area above the passage portion 37 on the outer peripheral surface of the supported portion 36, and makes the standby state linear cutting tool body 32 come into contact with the standby portion stably.

  As shown in FIGS. 5 and 6, the forward / reverse drive device 34 includes a support means 39 that rotatably supports the supported portion 36 and a drive portion 40 that rotates the supported portion 36 forward and backward. ing. The support means 39 includes a radial support portion 41 that prevents the rotation center of the supported portion 36 from being displaced and decentered in the radial direction, and a vertical support portion 42 that supports the supported portion 36 in a horizontal state. Consists of. In this example, as the radial support portion 41, a plurality of rollers 43 attached to the supported portion 36 and rotatably contacting the inner peripheral surface of the cylindrical support device 11 are vertically spaced apart. Further, the vertical support portion 42 is a combination of an annular guide rail 35 provided in the support device 11 and a plurality of rollers 44 attached to the supported portion 36. Thus, an example in which each roller 44 is in contact with the guide rail 35 and rotated is illustrated. The drive unit 40 includes a drive unit main body 45 made of a hydraulic motor or the like, and a chain 47 that meshes with a sprocket 46 attached to the output unit of the drive unit main body 45. The drive unit main body 45 is supported by the support device 11. The chain 47 is attached to the supported portion 36 of the guide device 33 in a horizontal ring shape and attached.

  The upper and lower radial support portions 41 constituting the support means 39 that supports the supported portion 36 are generated when the underground pile 1 is cut by the cutting tool body 32, and the cutting tool body 32 is removed from the underground pile 1. The reaction force transmitted to the supported portion 36 is received via the support pile 36, and the supported portion 36 is erected vertically to a predetermined position without causing eccentricity or tilting of the supported portion 36. The outer peripheral surface of each can be cut smoothly.

  As shown in FIG. 8, a stretching device 48 that stretches the linear cutting tool main body 32 is provided between the support device 11 and the supported portion 36. In this way, the tension device 48 provided between the support device 11 and the supported portion 36 is protected by avoiding the collision with the underground pile 1 by the supported portion 36. The stretching device 48 includes a tension state changing means 50 for bridging the linear cutting tool body 32 around the supported portion 36 and a tension for applying tension to the linear cutting tool body 32. Providing means 49.

  As shown in FIGS. 7 to 9, the tension state changing means 50 is a tension region T in which a linear cutting tool main body 32 is stretched around the supported portion 36 (the tension state). Is a fixed connecting portion 51 located at one end of a standby position (see FIG. 7) and a cutting position (see FIG. 9), a guide portion 52 located at the other end of the stretch region T, and a supported portion. 36 and a guiding portion 53 located between both ends of the stretching region T. The fixed connecting portion 51 is connected to the support device 11 and is disposed at the same height as the passage portion 37 of the supported portion 36, and the guide portion 52 is also connected to the support device 11, It is arranged at a position higher than the connecting portion 51. One end of the linear cutting tool main body 32 is connected to the connecting portion 51, is passed through the guide holes of the guide portion 53 and the guide portion 52, is suspended through the guide portion 52, and the lower end is tensioned. It is connected to the giving means 49.

  The guide portion 53 of the guide device 33 guides the linear cutting tool body 32 between the standby position and the cutting position as the supported portion 36 rotates, and has the same height as the passage portion 37. It is connected to the supported portion 36 so as to be in the position, and with the rotation of the supported portion 36, the linear cutting tool body 32 is placed on the outer peripheral surface of the supported portion 36 in the vicinity of the connecting portion 51. The linear cutting tool main body 32 is placed on the passage portion 37 of the supported portion 36 from the non-winding position Q (see FIGS. 7 and 10A) that is not brought into contact with the surface portion 38 and wound around the underground pile 1. A linear cutting tool is formed on the outer peripheral surface of the underground pile 1 through a winding intermediate position R (see FIGS. 8 and 10B) where a part of the cutting tool main body 32 is wound around the underground pile 1 while entering. It moves between a winding completion position P (see FIGS. 9 and 10C) for winding the main body 32 in an arc shape. The winding completion position P in this example is located below the guide portion 52.

  In the present embodiment, the tension applying means 49 is simple and always selects a weight having a weight corresponding to the tension in order to apply a stable constant tension. In addition to the weight, for example, an elastic body such as a hydraulic or pneumatic cylinder or a spring that applies tension may be used.

Next, a method for cutting and removing the underground pile 1 using the cutting device 30 of the present invention will be described.
(1) First step (preparation step): As in the first embodiment, as shown in FIG. 4, the earth around the head 1b of the underground pile 1 is removed to expose the pile head 1b. Let Next, the excavation casing 14 provided with the support device 11 and the underground pile cutting tool 32 is connected to the rotation drive device 13 and suspended, and the pile head 1b is externally fitted and prepared at the tip portion 14c.

(2) Second step (excavation step): The excavating casing 14 is pushed into the ground while being rotated by the activated rotation driving device 13, and the outer periphery of the underground pile 1 is excavated by the excavating blade 15 of the tip portion 14c. Then, the excavation space 2 is formed around the underground pile 1. Sediment generated by excavation is pushed up by the spiral blade 16 of the excavation casing 14 and discharged to the ground. When the underground pile cutting tool 31 supported by the support device 11 forming the excavation casing 14 reaches an appropriate height position in the ground as the excavation casing 14 excavates, the excavation casing 14 is pushed. Stop and finish excavation. During excavation, the guide device 33 of the underground pile cutting tool 31 supported by the support device 11 is in a standby state (the state shown in FIGS. 7 and 10A), and the linear cutting tool body 32 is covered. It is made not to collide with the underground pile 1 by making it contact | abut to the outer peripheral surface of the support part 36, and being located in the standby position in the excavation space 2. FIG.

(3) Third step (cutting step): Guide device 33 for the underground pile cutting tool 31 supported by the support device 11 that forms part of the excavating casing 14 that is suspended and stopped. And the linear cutting tool main body 32 is wound around the outer peripheral surface of the underground pile 1 with a predetermined tension. As shown in FIGS. 7 to 9, the cutting tool main body 32 is wound by rotating the supported portion 36 of the guide device 33 in the forward direction by the forward / reverse drive device 34 to guide the stretch state changing means 50. The portion 53 is moved from the non-winding position Q (see FIG. 7) toward the winding completion position P (see FIG. 9) so as to draw a horizontal arc locus, away from the fixed connection portion 51, and below the guide portion 52. Stop at the wrapping completion position P approaching the position. The linear cutting tool main body 32 is deformed by the movement of the guide portion 53 and enters the passage portion 37 of the supported portion 36 from a standby state where it is wound around the standby surface portion 38 of the outer peripheral surface of the supported portion 36. The tension state is changed to a cutting state wound around the outer peripheral surface of the middle pile 1.

  The length dimension of the linear cutting tool main body 32 from the connecting portion 51 to the guide portion 52 of the tension state changing means 50 is such that the guiding portion 53 is in the unwrapped position Q (see FIG. 12A). In the case of reference), the length dimension is (a), whereas when the guide portion 53 is at the winding completion position P (see FIG. (B)), the length dimension is (b + c). The weight of the tension applying means 49 that pulls the cutting tool body 32 gradually increases as it moves from the hanging position Q (see FIG. 7) toward the winding completion position P (see FIG. 9). The hanging dimension is shortened by the dimension (d). In this way, the tension state changing means 50 has the standby surface portion formed on the outer peripheral surface of the supported portion 36 by positioning the guide portion 52 located at the other end of the tension region T above the passage portion 37. 38 is above the passage portion 37, and the length dimension (a) of the cutting tool main body 32 can be wound around the outer peripheral surface of the underground pile 1, and the height H of the supported portion 36 is lowered. The whole can be made compact.

  When the linear cutting tool body 32 is wound around the outer peripheral surface of the underground pile 1 in a horizontal arc shape with a predetermined tension, the excavation casing 14 that is suspended and suspended is moved by the rotary drive device 13. The outer periphery of the underground pile 1 is continuously cut over the entire circumference with a linear cutting tool body 32 that rotates around the outer periphery of the underground pile 1 together with the support device 11 (casing 14 for excavation). An annular groove 27 (see FIG. 11) that opens laterally is formed. This cutting is the depth which cuts the longitudinal rebar 28 arranged near the outer periphery of the underground pile 1 and remains in a state where an inner non-cutting portion 1c which can be cut and separated without the longitudinal rebar 28 is left. Do. Thus, the cutting device 30 of the present invention can be in a cutting state in which the non-cutting portion 1c on the inner side where the vertical rebar 28 does not exist is easy to cut and separate, compared to a conventional device that does not leave a non-cutting portion. Cutting amount can be reduced. As a result, the cutting device 30 of the present invention can reduce the wear amount of the blade portion of the cutting tool main body 32 by reducing the cutting amount.

(4) Fourth step (cutting and separating step): When the cutting is completed, the rotation drive of the rotary drive device 13 is stopped to stop the rotation of the excavating casing 14, and the cutting tool body 32 in the cut state is grounded. The suspension state is changed by moving the guide device 33 to a standby state where it does not interfere with the middle pile 1. That is, as shown in FIGS. 9 to 7, the supported portion 36 of the guiding device 33 is rotated in the reverse direction by the forward / reverse driving device 34, and the guiding portion 53 of the stretching device 48 is moved to the winding completion position P ( 9) to the non-winding position Q (see FIG. 7), away from the guide portion 52, and closer to the fixed connecting portion 51. The linear cutting tool main body 32 is deformed by the movement of the guide portion 53, and is wound around the standby surface portion 38 on the outer peripheral surface of the supported portion 36 from the cutting state wound around the outer peripheral surface of the underground pile 1. Change to standby state. With the change in the tension state, the weight of the tension applying means 49 for pulling the cutting tool main body 32 is gradually lowered, and the hanging dimension of the weight is increased.

  Next, a gap expanding device (not shown) is inserted between the vicinity of the head 1b of the underground pile 1 and the casing 14 for excavation from a hydraulic cylinder or the like, and the vicinity of the head 1b of the underground pile 1 is moved to one side. By pressing, a large bending moment is generated in the inner non-cutting portion 1c where the vertical reinforcing bar 28 does not exist, and the non-cutting portion 1c is bent and cut. Finally, the ground surface side portion of the underground pile 1 cut and separated is pulled out using a crane or the like and removed from the ground to the ground.

(5) Fifth step (moving step): the underground cutting tool 31 in the standby state in which the linear cutting tool main body 32 is moved to the standby state without interfering with the underground pile 1 by the guide device 33. At the same time, it is lowered to the height of the next cutting position.

(6) Sixth step (repeated excavation step to cutting / separating step): When the underground pile 1 located at a deeper position than the portion removed by cutting and separating is cut and separated, the second step and the third step The fourth step and the fifth step are appropriately repeated in this order, and the entire underground pile 1 is removed to the ground. In the second process to be repeated, when the height dimension of the excavating casing 14 is insufficient, excavation is performed by adding a new extension portion 14a to the upper extension portion 14a. The cutting device 30 according to the present invention is an underground pile in which the cutting tool main body 32 is set in a standby state after the cutting device main body 32 having been cut is changed to a standby state in which the cutting tool main body 32 does not interfere with the underground pile 1 by the guiding device 33. The cutting tool 31 can be lowered together with the support device 11 to the height of the next cutting position, and the next cutting can be resumed, and the efficiency of the work of cutting a plurality of locations can be improved.

(7) Seventh step (post-cleaning step): If all the underground piles 1 are removed to the ground, the excavating casing 14 is pulled out from the ground, and if necessary, the holes after removing the underground piles are filled. Return and complete the work.

  In addition, the said 5th process and 6th process may be abbreviate | omitted and cutting and separation of the underground pile 1 may be made into one place.

(Third embodiment)
FIGS. 13 to 17 show a third embodiment of the cutting device of the present invention. FIG. 13 shows a standby state of the underground pile cutting tool 31 (a linear cutting tool body 32 on the underground pile 1). FIG. 14 is a perspective view illustrating a state in which the pile 1 is not wound) (however, the underground pile 1, the support device 11 and the guide rail 35 are indicated by a two-dot chain line. The same applies to FIGS. 14 and 15). The perspective view which shows the state in the middle of winding the linear cutting tool main body 32 around the underground pile 1, FIG. 15 is the middle of cutting with the linear cutting tool main body 32 which wound the underground pile 1 16A is a plan sectional view showing each state of the underground pile cutting tool 31 corresponding to each of FIGS. 13 to 15, and FIG. 17 is a supported portion. 36 shows a front view in which 36 is developed, and FIG. (A) shows a standby state in which the linear cutting tool main body 32 is not wound around the underground pile 1. B) shows a cutting state of the linear cutting tool main body 32 by multiplying underground pile 1 wound.

  The present invention device 60 according to the present embodiment is different from the second embodiment in that, in addition to the tension state changing means 61, in addition to the fixed connecting portion 51, the guide portion 52, and the guide portion 53, a new The intermediate guide 62 is provided. The intermediate guide portion 62 is connected to the support device 11 so as to be at the same height as the passage portion 37 and the guide portion 53, and the stretch region T (the region from the fixed connection portion 51 to the guide portion 52). ) Between the guide portion 52 and the guide portion 53. As a result, the standby surface portion 38 is formed on the outer peripheral surface of the supported portion 36 in the same height region as the passage portion 37, and the standby state linear cutting tool main body 32 is horizontally abutted to stably wait. It becomes like this. One end of the linear cutting tool main body 32 is connected to the connecting portion 51 using the stretching state changing means 61, and is inserted through the guide holes of the guide portion 53, the intermediate guide portion 62, and the guide portion 52. It is bridged and suspended via the guide portion 52, and the lower end is connected to the tension applying means 49.

  As shown in FIG. 17, the length dimension of the linear cutting tool main body 32 from the fixed connecting portion 51 to the guide portion 52 of the tension state changing means 61 is such that the guide portion 53 is not in the unwrapped position Q (see FIG. ))) And the length dimension (d + e ′) of the guide portion 53 at the winding completion position P (see FIG. (B)) are approximated. Even when moving from the non-winding position Q (see FIG. 13) toward the winding completion position P (see FIG. 15), the amount of change in the length dimension is small, and the weight of the tension applying means 49 that pulls the cutting tool body 32 is reduced. The rising dimension can be suppressed. In this way, the supported portion 36 is obtained by waiting the portion having the length dimension (e) of the linear cutting tool main body 32 in contact with the standby surface portion 38 at the same height as the passage portion 37. The overall height H can be lowered to make the whole compact.

(Fourth embodiment)
FIG. 18 thru | or FIG. 21 shows 4th Embodiment of this invention cutting device, FIG. 18 is the standby state (cutting tool main body 32 linear to the underground pile 1) of the cutting tool 31 for underground piles. FIG. 19 is a perspective view illustrating a state in which the pile 1 is not wound) (however, the underground pile 1, the support device 11 and the guide rail 35 are indicated by a two-dot chain line. The same applies to FIGS. 19 and 20). The perspective view which shows the state in the middle of winding the linear cutting tool main body 32 around the underground pile 1, FIG. 20 shows the middle of cutting with the linear cutting tool main body 32 around which the underground pile 1 is wound. 21A and 21C are plan sectional views showing respective states of the underground pile cutting tool 31 corresponding to each of FIGS. 18 to 20.

  The device 70 of the present invention according to the present embodiment is different from the second embodiment in that the tension state changing means 71 is linear around the supported portion 36 as shown in FIGS. The tensioning region T (see FIG. 18) and the cutting position (refer to FIG. 20) are stretched over the cutting tool main body 32 and stretched. One end of a linear cutting tool main body 32 fixed to the support portion 36 and guiding the linear cutting tool main body 32 between the standby position and the cutting position, and a stretching region T Between the guide portion 73 connected to the supported portion 36 and movably guides the middle of the linear cutting tool main body, and between the both ends of the stretching region T connected to the support device 11. The linear cutting tool main body 32 is positioned between the guide portion 72 and guided along the linear cutting tool main body 32 movably. It lies in having a middle guide section 74 for stretching the 2 horizontally. One end of the linear cutting tool main body 32 is connected to the guide portion 72, is passed through the guide holes of the intermediate guide portion 74 and the guide portion 73, is suspended through the guide portion 73, and the lower end is It is connected to the tension applying means 49.

  The guide portion 72 guides the linear cutting tool main body 32 between the standby position and the cutting position as the supported portion 36 rotates, and is at the same height as the passage portion 37. The linear cutting tool main body 32 is brought into contact with the standby surface portion 38 on the outer peripheral surface of the supported portion 36 to be connected to the supported portion 36 and in the vicinity of the intermediate guide portion 74. As the supported portion 36 rotates, the linear cutting tool main body 32 is caused to enter the passage portion 37 of the supported portion 36 from the unwrapped position Q (see FIGS. 18 and 21A) where no winding is performed. However, a linear cutting tool body 32 is formed on the outer peripheral surface of the underground pile 1 through a winding intermediate position R (see FIGS. 19 and 21B) where a part of the cutting tool body 32 is wound around the underground pile 1. Is moved to a winding completion position P (see FIGS. 20 and 21C). The winding completion position P in this example is a position facing the intermediate guide portion 74.

(Fifth embodiment)
22 to 25 show a fifth embodiment of the cutting apparatus of the present invention. FIG. 22 shows a standby state of the underground pile cutting tool 31 (a linear cutting tool body 32 on the underground pile 1). FIG. 23 is a perspective view illustrating a state in which the pile 1 is not wound) (however, the underground pile 1, the support device 11, and the guide rail 35 are indicated by a two-dot chain line. The same applies to FIGS. 23 and 24). The perspective view which shows the state in the middle of winding the linear cutting tool main body 32 around the underground pile 1, FIG. 24 is the middle of cutting with the linear cutting tool main body 32 around which the underground pile 1 was wound. The perspective view shown and FIGS. 25 (A) to 25 (C) are plan sectional views showing respective states of the underground pile cutting tool 36 corresponding to each of FIGS.

  The device 80 of the present invention according to the present embodiment is different from the second embodiment in that the tension state changing means 83 has a linear cutting tool on the supported portion 36 as shown in FIGS. A tension region T that stretches the main body 32 (the tension state is different between the standby position (see FIG. 22) and the cutting position (see FIG. 24)) and is connected to the support device 11 to A fixed connecting portion 84 that fixes one end of the cutting tool body 32 and a supported portion 36 that is located at the other end of the stretch region T, and is movably guided along the linear cutting tool body 32. Between the guide portion 85 and the supported portion 36 located between both ends of the stretch region T, and movably guides the middle of the linear cutting tool main body 32 between the fixed connecting portion 84 and There is a guiding portion 86 for horizontally stretching the linear cutting tool main body 32. One end of the linear cutting tool main body 32 is connected to the fixed connecting portion 84, is passed through the guide holes of the guide portion 86 and the guide portion 85, is suspended through the guide portion 85, and the lower end is It is connected to the tension applying means 49.

  The guide portion 86 guides the linear cutting tool main body 32 between the standby position and the cutting position as the supported portion 36 rotates, and is at the same height as the passage portion 37. In this way, it is connected to the supported portion 36 and is located in the vicinity of the fixed connecting portion 84 so that the linear cutting tool main body 32 is not wound around the underground pile 1 (FIGS. 22 and 25A). )), A part of the cutting tool main body 32 is wound around the underground pile 1 while the linear cutting tool main body 32 enters the passing part 37 of the supported part 36 as the supported part 36 rotates. A winding completion position P (FIGS. 24 and 25) in which the linear cutting tool main body 32 is wound around the outer peripheral surface of the underground pile 1 in an arc shape through the winding intermediate position R (see FIGS. 23 and 25B). (See (C)). The winding completion position P in this example is a position facing the fixed connecting portion 84.

(Sixth embodiment)
FIG. 26 thru | or FIG. 29 shows 6th Embodiment of this invention cutting device, FIG. 26 is the standby state (cutting tool main body 32 linear to the underground pile 1) of the cutting tool 31 for underground piles. FIG. 27 is a perspective view illustrating a state in which the pile 1 is not wound) (however, the underground pile 1, the support device 11, and the guide rail 35 are indicated by a two-dot chain line. The same applies to FIGS. 27 and 28). The perspective view which shows the state in the middle of winding the linear cutting tool main body 32 around the underground pile 1, FIG. 28 is the middle of cutting with the linear cutting tool main body 32 around which the underground pile 1 was wound. 29 (A) to FIG. 29 (C) are plan sectional views showing respective states of the underground pile cutting tool 31 corresponding to each of FIG. 26 to FIG.

  The device 90 of the present invention according to this embodiment is different from the second embodiment in that the tension state changing means 91 has a linear cutting tool on the supported portion 36 as shown in FIGS. A tension region T that stretches the main body 32 (the tension state is different between the standby position (see FIG. 26) and the cutting position (see FIG. 28)) and is connected to the supported portion 36, One end of the linear cutting tool main body 32 is fixed, and a guide portion 92 for guiding the linear cutting tool main body 32 between the standby position and the cutting position, and the other end of the stretching region T are supported. The linear cutting tool main body 32 is stretched horizontally between a guide portion 93 connected to the apparatus 11 and movably guiding the linear cutting tool main body, and the guide device 92 connected to the support device 11. The intermediate guide portion 94 is provided. One end of the linear cutting tool main body 32 is connected to the guide portion 92, is passed through the guide holes of the guide portion 93 and the intermediate guide portion 94, is suspended through the guide portion 93, and the lower end is It is connected to the tension applying means 49.

  The guide portion 92 guides the linear cutting tool body 32 between the standby position and the cutting position as the supported portion 36 rotates, and is at the same height as the passage portion 37. As shown in FIG. 26 and FIG. 29A, the linear cutting tool main body 32 is not wound around the underground pile 1 and is connected to the supported portion 36 in the vicinity of the fixed connecting portion 84. )), A part of the cutting tool main body 32 is wound around the underground pile 1 while the linear cutting tool main body 32 enters the passing part 37 of the supported part 36 as the supported part 36 rotates. A winding completion position P (FIGS. 28 and 29) in which the linear cutting tool main body 32 is wound around the outer peripheral surface of the underground pile 1 in an arc through the winding intermediate position R (see FIGS. 27 and 29B). (See (C)). The winding completion position P in this example is a position facing the intermediate guide portion 94.

(Seventh embodiment)
FIG. 30 shows a seventh embodiment of the cutting device of the present invention, in which an intermediate omitted front sectional view showing a state before excavation of the underground pile 1 after excavating the outside of the underground pile 1 is shown. FIG. The present cutting device 100 according to the present embodiment is greatly different from the present cutting device 10 according to the first embodiment (FIGS. 1 to 3) in that the support device 101 and the excavating casing 102 are used. Is formed by another support casing 103, and this support casing 103 is rotated by the rotation drive device 13. The support casing 103 has an outer diameter smaller than the inner diameter of the excavation casing 102 and an inner diameter larger than the outer diameter of the underground pile 1. Can be placed in the excavation space formed between the two.

  The underground pile cutting tool 104 of this example supported by the supporting casing 103 has the same configuration as the underground pile cutting tool 12 shown in the first embodiment, and is horizontal as shown in FIG. The cutting tool main body 19, the urging means 20, the retreating device 21, and the like supported in a swingable manner are provided. Naturally, the underground pile cutting tool 104 has the same configuration as the underground pile cutting tool 31 shown in the second to sixth embodiments in addition to this aspect, and is a linear cutting tool as shown in FIG. There may be a case in which the main body 32 and the guide device 33 are provided.

  Next, the cutting method of the underground pile which cuts and removes the underground pile 1 using this invention cutting device 100 is demonstrated.

(1) First step (preparation step): After exposing the pile head 1b, a drilling device (not shown) different from the cutting device 100 is prepared, and the upper end of the excavating casing 102 is connected to the drilling device. Then, the pile head 1b is fitted on the tip portion 102a of the excavating casing 102.
(2) Second step (excavation step): With the activated excavator, the excavator casing 102 is pushed into the ground while rotating, and excavation is started. When the vertical dimension of the excavation casing 102 becomes insufficient during excavation, a new extension casing (not shown) is added between the excavation casing 102 and the excavator, and the excavation is continued. When the distal end portion 102a of the excavating casing 102 reaches the lowest end of the underground pile 1, the rotary pushing is stopped to complete excavation.
(3) Third step (cutting device preparation step): The excavating device is removed from the excavating casing 102 pushed into the ground, and the cutting device 100 shown in FIG. The upper end of the supporting casing 103 is connected.

(4) Fourth step (arrangement step): The connected supporting casing 103 is lowered by the reader 25 and arranged at an appropriate depth between the underground pile 1 and the excavating casing 102.
(5) Fifth step (cutting step): The cutting tool body of the underground pile cutting tool 104 is rotated in the same manner as in the first embodiment while rotating the support casing 103 arranged as described above by the rotation drive device 13. 19 is moved from the standby position toward the underground pile 1 by the urging means 20, the blade portion is pushed to the outer peripheral surface of the underground pile 1, and the cutting of the underground pile 1 is started.
(6) Sixth step (cutting / separating step): After the cutting is finished, after the rotation drive of the rotation drive device 13 is stopped and the rotation of the support casing 103 is stopped, the ground is the same as in the first embodiment. The pile cutting tool 104 is released from the bias of the cutting tool main body by the biasing means 20 and is forcibly retracted to the standby position by the retracting device 21. After that, the supporting casing 103 is lifted to the ground by the reader 25, and, as in the first embodiment, an interval widening device (not shown) is arranged between the underground pile 1 and the excavating casing 102, and the pile 1 The ground surface side portion that has been cut and separated is removed to the ground.

(7) Seventh step (addition step of supporting casing 103): When the underground pile 1 located at a deeper position than the portion removed by cutting and separating is removed, the supporting casing 103 and the driving motor 26 are removed. A new extension casing (not shown) is added to the output portion 26a to extend the support casing 103.
(8) Eighth step (re-arrangement step-cutting step-cutting separation step-replacement step): When the seventh step (replacement step) is completed, the fourth step, fifth step, sixth step, The seven steps are repeated appropriately in this order, and the entire underground pile 1 is removed to the ground.
(7) Ninth step (post-cleaning step): If all of the underground piles 1 are removed to the ground, the excavating casing 102 is pulled out from the ground as in the first embodiment, and if necessary, Fill the hole after removing the underground pile 1 and complete the work.

  As described above, the cutting device 100 of the present invention is arranged in the excavation space formed between the underground pile 1 and the excavation casing 102 by the support device 101 (support casing 103) during cutting as described above. . Therefore, since the support device 101 does not receive earth pressure, the cutting device 100 of the present invention can reduce the rotational force necessary for cutting the underground pile 1 (the force by which the rotation drive device 13 rotates the support device 101). Even during cutting, the support device 101 can be easily lifted to perform maintenance inspection (replacement, repair of failure, etc.) of the underground pile cutting tool 104.

  In addition, if the cutting device 100 of the present invention adopts a type in which not only the supporting casing 103 but also the excavating casing 102 can be detachably connected as the drive motor 26, the excavating casing 102 is rotationally pushed only by the cutting device 100 of the present invention. Therefore, it is not necessary to prepare another drilling device for drilling.

  The configuration other than the above differences is substantially the same as that of the cutting device 10 of the present invention in the first embodiment, and the same reference numerals as in FIGS. 1 to 3 (first embodiment) in FIG. The thing shows the same structural member.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a first embodiment of a cutting device of the present invention, and is a front sectional view with an intermediate omitted showing a state before excavating an underground pile after excavating the outside of the underground pile. It is front sectional drawing which expanded the principal part of this invention cutting device in 1st Embodiment. It is a plane sectional view showing each state of a cutting tool for underground piles in a 1st embodiment, (A) shows a standby state of a cutting tool for underground piles, and (B) is a cutting tool for underground piles. The state immediately before starting cutting is shown, and (C) shows the state where the underground pile 1 is being cut with the underground pile cutting tool. The 2nd Embodiment of this invention cutting device is shown, It is front sectional drawing which omitted the intermediate | middle which shows the state before starting the cutting with respect to the outer peripheral surface of an underground pile after excavating the outer side of an underground pile . The main part of this invention cutting device in 2nd Embodiment is expanded, and the state (The state which is not winding a linear cutting tool main body on an underground pile) before starting the cutting with respect to an underground pile is shown. It is front sectional drawing shown. It is the back sectional view which expanded further the principal part of the present invention cutting device in a 2nd embodiment, and shows the same state. It is a perspective view which shows the standby state (state which does not wrap the linear cutting tool main body around the underground pile 1) of the underground pile cutting tool in 2nd Embodiment (however, an underground pile, a support device, and The guide rail is indicated by a two-dot chain line (the same applies to FIGS. 8 and 9). It is a perspective view which shows the state in the middle of winding the linear cutting tool main body on the underground pile in 2nd Embodiment. It is a perspective view which shows the middle of cutting with the linear cutting tool main body which wound the underground pile in 2nd Embodiment. Drawing (A)-figure (C) are plane sectional views showing each state of a cutting tool for underground piles corresponding to each of Drawing 7-Drawing 9. It is the expanded plane sectional view which shows the cutting state which left the non-cutting part which can cut-separate underground pile in 2nd Embodiment. The front view which expand | deployed the to-be-supported part in 2nd Embodiment is shown, Comprising: FIG. (A) shows the standby state which has not wound the linear cutting tool main body on the underground pile, FIG. (B) Shows a cutting state in which a linear cutting tool body is wound around an underground pile. The 3rd Embodiment of this invention cutting device is shown, and it is a perspective view which shows the standby state (the state which has not wound the linear cutting tool main body around the underground pile 1) of the cutting tool for underground piles (However, the underground pile, the support device, and the guide rail are indicated by a two-dot chain line. The same applies to FIGS. 14 and 15). It is a perspective view which shows the state in the middle of winding the linear cutting tool main body on an underground pile in 3rd Embodiment. It is a perspective view which shows the middle of cutting with the linear cutting tool main body which wound the underground pile in 3rd Embodiment. Drawing (A)-figure (C) are plane sectional views showing each state of a cutting tool for underground piles corresponding to each of Drawings 13-15. The front view which expanded the to-be-supported part in 3rd Embodiment is shown, Comprising: FIG. (A) shows the standby state which is not winding the linear cutting tool main body on an underground pile, FIG. ) Shows a cutting state in which a linear cutting tool body is wound around the underground pile 1. The 4th Embodiment of this invention cutting device is shown and it is a perspective view which shows the standby state (state which does not wrap a linear cutting tool main body on an underground pile) of the underground pile cutting tool. (However, the underground pile, the support device, and the guide rail are indicated by a two-dot chain line. The same applies to FIGS. 19 and 20.) It is a perspective view which shows the state in the middle of winding the linear cutting tool main body on an underground pile in 4th Embodiment. It is a perspective view which shows the middle of cutting with the linear cutting tool main body which wound the underground pile in 4th Embodiment. Drawing (A)-figure (C) show the plane sectional view showing each state of the cutting tool for underground piles corresponding to each of Drawing 18-Drawing 20. The 5th Embodiment of this invention cutting device is shown, It is a perspective view which shows the standby state (state which does not wind a linear cutting tool main body around an underground pile) of the underground pile cutting tool 31 Yes (however, underground piles, support devices and guide rails are indicated by two-dot chain lines. The same applies to FIGS. 23 and 24.) It is a perspective view which shows the state in the middle of winding the linear cutting tool main body on an underground pile in 5th Embodiment. It is a perspective view which shows the middle of cutting with the linear cutting tool main body which wound the underground pile in 5th Embodiment. Drawing (A)-figure (C) show the plane sectional view showing each state of the cutting tool for underground piles corresponding to each of Drawing 22-Drawing 24. The 6th Embodiment of this invention cutting device is shown, and it is a perspective view which shows the standby state (state which does not wind a linear cutting tool main body around an underground pile) of the cutting tool 31 for underground piles Yes (however, underground piles, support devices and guide rails are indicated by two-dot chain lines. The same applies to FIGS. 27 and 28.) It is a perspective view which shows the state in the middle of winding the linear cutting tool main body on an underground pile in 6th Embodiment. It is a perspective view which shows the middle of cutting with the linear cutting tool main body which wound the underground pile in 6th Embodiment. Drawing (A)-figure (C) show the plane sectional view showing each state of the cutting tool for underground piles corresponding to each of Drawing 26-Drawing 28. The 7th Embodiment of this invention cutting device is shown, It is front sectional drawing which abbreviate | omitted the intermediate | middle which shows the state before starting the cutting with respect to the underground pile 1 after excavating the outer side of the underground pile 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Underground pile 1a ... Protruding part 1b ... Pile head 1c ... Non-cutting part 2 ... Excavation space 10 ... Underground pile cutting device (present invention cutting device) 11 ... Support device 11a ... Work port 12 ... For underground pile Cutting tool 13: Rotation drive device 14 ... Excavation casing 14a ... Extension 14b ... Intermediate part 14c ... End part 15 ... Excavation blade 16 ... Mud discharge spiral blade 17 ... Eccentricity prevention part 18 ... Support 19 ... Cutting tool body 20 ... Biasing means 21 ... Retraction device 22 ... Blade portion 23 ... Rope 24 ... Tensioning device 25 ... Leader 26 ... Drive motor 26a ... Output unit 27 ... Annular groove 28 ... Vertical rebar 30 ... Underground pile cutting device (cutting according to the present invention) 31) Cutting tool for underground pile 32 ... Cutting tool main body 33 ... Guiding device 34 ... Forward / reverse drive device 35 ... Guide rail 36 ... Supported portion 37 ... Passing portion 38 ... Standby surface portion 39 ... Support means 40 ... Drive portion 41 ... half Radial direction support part 42 ... Vertical direction support part 43 ... Roller 44 ... Roller 45 ... Drive part main body 46 ... Sprocket 47 ... Chain 48 ... Stretching device 49 ... Tension applying means 50 ... Stretching state changing means 51 ... Fixed connecting part 52 ... Guide part 53 ... Guiding part 60 ... Underground pile cutting device (present invention cutting apparatus) 61 ... Stretching state changing means 62 ... Intermediate guide part 70 ... Underground pile cutting apparatus (present invention cutting apparatus) 71 ... Tensioned state Changing means 72 ... Guide part 73 ... Guide part 74 ... Intermediate guide part 80 ... Underground pile cutting device (present invention cutting apparatus) 83 ... Stretching state changing means 84 ... Fixed connecting part 85 ... Guide part 86 ... Guide part 90 ... Ground pile cutting device (cutting device of the present invention) 91... Tension state changing means 92... Guiding portion 93... Guide portion 94 .. intermediate guide portion 100 ... underground pile cutting device (cutting device of the present invention) 101. Excavation case Ring 103 ... supporting casing 104 ... ground stakes cutting tool T ... stretched regions P ... winding completion position Q ... Non winding position R ... winding middle position

Claims (15)

  In an underground pile cutting device provided with a support device that can be arranged in an excavation space formed around an outer periphery of the underground pile, and an underground pile cutting tool that is supported by the support device and cuts the outer peripheral surface of the underground pile The underground pile cutting device is provided with a rotary drive device that is supported to rotate integrally with the support device and rotates the support device at an appropriate height position in the excavation space. .   2. The underground according to claim 1, wherein the underground pile cutting tool includes a cutting tool main body supported by the support device so as to be horizontally swingable, and biasing means for biasing the cutting tool main body for cutting. Pile cutting device.   The said underground pile cutting tool is equipped with the retreat apparatus which forcibly retracts the said cutting tool main body from the cutting position which cuts the outer peripheral surface of the said underground pile to the stand-by position in the said excavation space. Underground pile cutting equipment.   The underground pile cutting tool is supported by the flexible linear cutting tool main body provided with a large number of blade portions and the support device, and the linear cutting tool main body from the standby position in the excavation space. The underground pile cutting device according to claim 1, further comprising a guide device that guides the outer peripheral surface of the underground pile up to a cutting position wound in a horizontal arc shape.   The guide device is rotatably supported by the support device, and a supported portion in which an underground pile penetration space is formed inside, a forward / reverse drive device that rotates the supported portion in the forward and reverse directions, and the supported device The linear cutting tool main body is stretched around the part, and the forward and reverse rotation of the supported part causes the standby position outside the supported part between the standby position and the cutting position inside the supported part. The underground pile cutting device according to claim 4, further comprising a stretching device that changes a stretching state of the linear cutting tool main body.   The said supported part forms the standby surface part which the said linear cutting tool main body of the said standby position contacts on an outer peripheral surface, The said line which changes the state of a stretch between the said standby position and the said cutting position The underground pile cutting device according to claim 5, wherein a passage portion through which the main cutting tool body passes is formed.   The stretching device is positioned at one end of a stretching region that stretches the linear cutting tool main body on the supported portion, and is connected to the supporting device to fix one end of the linear cutting tool main body. A connecting portion, a guide portion that is connected to the support device and is positioned at the other end of the stretching region, and is movably guided along a linear cutting tool body, and is connected to the supported portion and is connected to the tension portion. Located between both ends of the rack region, guides the linear cutting tool body between the standby position and the cutting position, and horizontally stretches the linear cutting tool body between the fixed connection part The underground pile cutting apparatus according to claim 6, further comprising a tension state changing unit having a guiding portion to perform.   The stretching device is located at one end of a stretching region that stretches the linear cutting tool body on the supported portion, and is connected to the supported portion to fix one end of the linear cutting tool body. A guide portion for guiding a linear cutting tool body between the standby position and the cutting position; and a linear cutting tool body located at the other end of the stretch region and connected to the supported portion A guide portion that is movably guided in the middle of the wire, and is connected to the support device and is positioned between both ends of the stretching region, and is movably guided in the middle of the linear cutting tool body to The underground pile cutting apparatus according to claim 6, further comprising a tension state changing means having an intermediate guide portion for horizontally stretching the linear cutting tool main body therebetween.   The supported portion forms a passing portion through which the linear cutting tool main body that changes a tension state between the standby position and the cutting position passes, and the stretching device includes the supported portion A fixed connecting portion that is connected to the support device and fixes one end of the linear cutting tool main body, and the other of the stretching area. A guide part that is connected to the supported part and movably guides the middle of the linear cutting tool main body, and is located between both ends of the stretched area that is connected to the supported part. And a tension state changing means having a guide portion that guides the linear cutting tool main body in a movable manner and horizontally stretches the linear cutting tool main body with the fixed connecting portion. 5. The underground pile cutting apparatus according to 5.   The supported portion forms a passing portion through which the linear cutting tool main body that changes a tension state between the standby position and the cutting position passes, and the stretching device includes the supported portion The linear cutting tool body is positioned at one end of the stretching region where the linear cutting tool body is stretched, and is connected to the supported portion to fix one end of the linear cutting tool body, and the line between the standby position and the cutting position is fixed. Connected to the support device, a guide portion that guides the main body of the cutting tool, a guide portion that is located at the other end of the stretching region and that is connected to the support device and guides the middle of the linear cutting tool main body movably The underground pile cutting apparatus according to claim 5, further comprising a tension state changing means having an intermediate guide portion for horizontally stretching the linear cutting tool main body between the guide portion and the guide portion.   The tension device includes a tension applying unit that connects a weight to the other end that is a free end of the linear cutting tool main body and applies a weight of the weight to the linear cutting tool main body. The underground pile cutting apparatus according to any one of 10.   The said support apparatus is formed with the casing for excavation which provided the excavation blade at the front end side, The casing drive device which rotates this casing for excavation is used as the said rotation drive device in any one of Claims 1-11. The underground pile cutting device described.   In the underground pile cutting method of forming an excavation space around the underground pile and cutting the outer peripheral surface of the underground pile with the underground pile cutting tool arranged in the excavation space, the underground pile cutting tool includes: Supporting and rotating the support device arranged at an appropriate height position in the excavation space, and continuously cutting the entire circumference of the outer peripheral surface of the underground pile with the underground pile cutting tool rotating together with the support device. A method for cutting underground piles.   As the underground pile cutting tool, a flexible linear cutting tool body provided with a large number of blade portions is guided from the standby position in the excavation space by a guide device supported by the support device. A cutting process in which a linear cutting tool body guided to a cutting position is rotated together with a support device together with a support device using a guide guided to a cutting position wound around an outer peripheral surface in a horizontal arc shape, and to a standby position. 14. The method for cutting an underground pile according to claim 13, wherein a moving step of lowering the guided linear cutting tool main body together with the support device in the excavation space to move to the next cutting position is repeated alternately.   The excavation space is formed by pushing a excavation casing provided with an excavation blade on the tip side into the ground while rotating around the outside of the underground pile, and the excavation space, the underground pile, The method for cutting an underground pile according to claim 13 or 14, wherein the space is formed in a space formed between the two.

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