JP5624401B2 - Underground obstacle lifting device - Google Patents

Description

  This invention is a lifting device for removing a built-in pile or concrete foundation that is an underground obstacle, for example, grabbing an underground obstacle excavated by a casing and lifting and removing it from the ground, The present invention relates to a lifting device capable of cutting an underground obstacle while lifting it and lifting and removing it.

For example, when rebuilding various structures, it is necessary to remove old existing piles (cast-in-place piles) and existing foundations that remain in the ground after dismantling of the structures from the ground to prepare for the construction of new structures. Don't be.

  Conventionally, as a method for removing a built-up pile (hereinafter simply referred to as a pile) that is an underground obstacle, the outer side of the pile is excavated with a cylindrical casing, and the casing is built. The excavation space is formed by excavating the ground into a cylindrical shape, the pile surrounded by the excavation space is cut with a cutting blade provided in the casing, and the pile after cutting is lifted with a lifting device inserted into the casing and taken out And the method of removing a pile by repeating such an operation | work sequentially is proposed (for example, refer patent document 1).

  As another removal method, the outside of the pile is excavated with a cylindrical casing and the casing is built, and the edge of the pile and the ground is cut by making the excavation length of the casing longer than the pile. The pile is lifted and held by a lifting device, and is removed by repeating the cutting of the portion of the pile that has come out on the ground and the lifting of the cut length (for example, see Patent Document 2).

  As a general lifting device used in the construction of the removal method as described above, a holding arm that is paired on both sides sandwiching a vertical axis of the supporting member with a supporting member suspended by a wire such as a crane Is attached to the necessary number of pairs, and each of the holding arms is opened and closed by a hydraulic cylinder, and a pair of holding arms is closed by a lower end toe so that a pile is gripped (for example, Patent Document 3). reference).

JP 2009-2056 A Japanese Patent Laid-Open No. 10-252065 Japanese Patent No. 2553000

  By the way, there are multiple types of piles with different diameters, and in the conventional removal method, for the piles to be removed, multiple types of lifting devices with different grip diameters are prepared according to the diameter, Increasing the number not only increases the equipment cost, but is also inconvenient for storage and transportation to the site.

  In addition, as described above, the removal method in which the pile in the casing is grasped by the lifting device and lifted up is required unless the pile is grasped in a relatively narrow cylindrical excavation space formed by excavation between the inner periphery of the casing and the pile. Therefore, in a lifting device suspended by a crane, in order to insert the holding arm into the excavation space, sufficient accuracy is required for posture control of the holding arm. In a structure in which a pair of holding arms is opened and closed by a hydraulic cylinder and the open posture is maintained by controlling this hydraulic pressure, as in the lifting device used, it is difficult to keep the holding arm open posture constant. It is difficult to enter the holding arm of the lifting device inserted into the excavation space.

  Therefore, an object of the present invention is to perform excavation formed on the inner periphery of the casing by being able to grip a plurality of types of underground obstacles having different diameters with a single structure and improving the holding accuracy of the holding posture of the holding arm. It is an object of the present invention to provide a lifting device for an underground obstacle capable of surely grasping an underground obstacle by reliably entering a holding arm into the space.

  In order to solve the above-described problems, the present invention attaches a plurality of holding arms facing the vertical axis of the supporting member to a supporting member suspended and held by a wire such as a crane, and the necessary holding arms In the lifting device for underground obstacles that can be opened and closed by an expansion / contraction drive, the attachment position of each holding arm to the support member can be adjusted along the opening and closing direction of the holding arm.

  The mounting of the holding arm to the support member can be adjusted by providing a plurality of mounting holes in the support member along the opening and closing direction of the holding arm, and selecting a mounting hole for locking the mounting arm provided in the holding arm. It can be set as the structure.

  A structure may be provided in which a stopper mechanism is provided between the support member and the holding arm to hold the posture of the holding arm in the open state.

  The holding arm is provided with an inward gripping claw at the lower end thereof, and the gripping claw has a blade function of cutting around the underground obstacle by rotating in a state of gripping the underground obstacle. Can be.

  Here, the support member in the lifting device is formed by providing a horizontal support beam at the lower end of the suspension shaft that connects the wire of the crane at the upper end and a horizontal arm at the upper end, and is positioned at both ends of the support beam. The holding arm of the holding arm is connected to the support beam with a pin, and the holding arm is swung about the pin as a fulcrum by expansion and contraction of a hydraulic cylinder connecting the upper end of the holding arm and the horizontal arm.

  In the lifting device, the number of holding arms provided on the support member is not limited as long as it is plural. For example, the support beams of the support member are arranged perpendicular to the four sides in a plan view from the suspension shaft, and the end portions of the support beams are arranged. It is possible to adopt a structure in which the holding arms are attached to each other, and the holding arms attached to both ends of the support beam aligned on the same axis line are opposed to each other to form a pair, and two pairs are arranged so as to be gripped from four directions. .

  There are cases where the holding arms have the same length in the upper and lower sides and a combination of holding arms having different vertical lengths.

  The mounting structure of the holding arm with the same length in the upper and lower sides is attached to the supporting beam with a bifurcated mounting arm provided on both sides so as to protrude toward the axis of the suspension shaft at the intermediate part of the holding arm. The fitting portion of the mounting arm and the support beam is coupled by a pin using a mounting hole provided in the support beam, so that it can be swung around the pin as a fulcrum. By selecting the mounting hole provided in the holder, the gripping diameter of the holding arm can be changed in a plurality of stages.

  In addition, when the holding arms having different vertical lengths are combined, the mounting structure of the holding arms to the support beam can adopt the same structure as that of the holding arms having the same vertical length as described above. This long holding arm is formed wide to maintain strength, and a bifurcated mounting arm is provided on both sides of the long holding arm, and support beams are provided in parallel on both sides of the support member. The mounting arms are externally fitted to the support beams on both sides, and like the short clamping arm, the fitting portion of the mounting arms and the support beams is pin-coupled, and by selecting the mounting holes provided in the support beams, You may enable it to change the holding | grip diameter of a long clamping arm in multiple steps.

  In addition, the stopper mechanism for holding the lifting arm holding arm in the open state along the vertical direction is provided with a horizontal plate provided on the upper surface of the support beam and a stopper protrusion on the upper and lower opposing surfaces of the mounting arm. Even if the holding arm is formed and installed in any mounting hole, when the holding arm is opened, the upper and lower stopper projections come into contact with each other so that the posture along the vertical direction of the holding arm is maintained. become.

  As described above, when the holding state of the holding arm is mechanically held by the stopper mechanism, the control mechanism of the hydraulic cylinder can be simplified compared to the posture holding by the hydraulic control, and the holding arm can be opened in the open state by the stopper mechanism. Since the posture is along the vertical direction, the cylindrical excavation space formed between the inner periphery of the casing and the underground obstacle can be inserted without any trouble in the open state.

  According to the present invention, the mounting position of the pair of sandwiching arms with respect to the support member can be adjusted along the opening and closing direction of the sandwiching arm, so that when the underground obstacle to be gripped has a different diameter, the sandwiching arm is sandwiched. This can be dealt with by selecting the mounting position of the arm, and a single structure can grasp and lift underground obstacles having different diameters.

  In addition, since the holding state of the holding arm is held by the stopper mechanism, the opening state along the vertical direction of the holding arm is mechanically held to improve the opening posture accuracy and simplify the control mechanism of the hydraulic cylinder. The open clamping arm can be surely entered into the cylindrical excavation space that has been excavated around the underground obstacle with improved posture accuracy. You can hold the object securely and lift it.

  Furthermore, by giving the blade function to cut the periphery of the underground obstacle to the inward gripping claw provided at the lower end of the clamping arm, by rotating the clamping arm that grabbed the underground obstacle, You can make a cut around the object, and you can break the underground obstacle from the cut, and you can remove the underground obstacle efficiently by grasping, breaking and lifting the underground obstacle continuously. can do.

The vertical front view of the state which showed the example using the holding arm from which the length of the lifting device which concerns on this invention differs, and was inserted in the casing in the open state of the holding arm Cross-sectional plan view of FIG. The vertical side view of the state which showed the example using the holding arm from which the length of the lifting device which concerns on this invention differs, and was inserted in the casing in the open state of the holding arm (A) is a cross-sectional plan view of the lifting device according to the present invention, (b) is a front view showing the structure of the mounting portion of the holding arm with respect to the support member, and (c) is a cross-sectional plane taken along arrows cc in (b). Figure, (d) is an exploded perspective view of the reinforcing padding, (e) is an enlarged cross-sectional view of the state of use of the reinforcing padding The disassembled perspective view which shows the attachment structure of the supporting member and clamping arm of the lifting device which concerns on this invention FIG. 2 shows examples of different mounting structures of the supporting member and the long holding arm using the holding arms having different lengths of the lifting device according to the present invention, (a) is a front view of the holding arm in the open state, and (b) is the same. Side view, (c) is a cross-sectional plan view The change by the holding | grip width adjustment of the clamping arm in the lifting device which concerns on this invention is shown, (a) is a longitudinal front view of the state inserted in the casing in the open posture which set the clamping arm to the maximum width, (b) is clamping A longitudinal front view of the arm inserted in the casing in the open posture with the intermediate width set, (c) is a longitudinal front view of the state where the arm is inserted in the casing in the open posture with the minimum width set (A) is a longitudinal front view showing a lower structure of a casing used in a method for removing an underground obstacle using the lifting device according to the present invention, and (b) is a cross-sectional plan view taken along arrow bb in (a). (C) is a cross-sectional plan view taken along arrow cc in (a), (d) is a longitudinal sectional view showing an arrangement state when the arrangement of inner bits provided on the inner periphery of the casing is linearized, ( e) is a cross-sectional plan view taken along arrow d-d in (a). (A) is a partially cutaway front view of an excavating glass raising machine used for the method of removing underground obstacles using the lifting device according to the present invention, and (b) is a bottom view of the same. (A) is a longitudinal front view of the lower structure showing the combined state of the casing and excavation lifter used in the method of removing underground obstacles using the lifting device according to the present invention, (b) is an arrow of (a) Transverse bottom view at bb The process of the example which applied the removal method of the underground obstacle using the lifting device concerning this invention to the case where the underground obstacle is a pile is shown in order, and (a) shows the circumference of a pile with a casing and an excavation glass raising machine. (B) is a longitudinal sectional view of a state where the excavation glass raising machine is extracted from the casing, and (c) is a state where the excavation glass raising machine extracted from the casing is separated from the casing. Longitudinal section of the excavation waste disposal The removal method of the underground obstacle using the lifting apparatus according to the present invention is shown in the order of steps of an example in which the underground obstacle is a pile, and (a) shows a state in which the excavating glass raising machine is extracted from the casing. A longitudinal sectional view, (b) is a longitudinal sectional view showing a state in which a lifting device is inserted into a casing from which an excavating glass raising machine has been removed and a pile is gripped by a clamping arm of the lifting device. Longitudinal sectional view showing a state in which the pile is grasped by the holding arm of the lifting device, and the casing and the lifting device rotate to cut the pile.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 7 show a lifting device 1 for underground obstacles according to the present invention. A plurality of clamping arms 3 are attached to a supporting member 2 suspended and held by a wire such as a crane. Each clamping arm 3 is a supporting member. 2 can swing in the direction in which the lower end approaches and separates from the upper and lower shaft centers, and each holding arm 3 can be opened and closed independently by a motor-driven telescopic jack or a hydraulic cylinder 4 as a telescopic driving machine. ing.

  The number of the clamping arms 3 attached to the support member 2 is not limited as long as it is two or more, but as a preferred example, in the illustrated case, a pair is formed on both sides of the vertical axis of the support member 2. A structure is shown in which two sets of sandwiching arms 3 are attached, and a total of four sandwiching arms 3 are gripped from four directions.

  There are several different patterns in the structure of the holding arm 3 and the accompanying mounting structure to the support member 2, specifically, the case where the holding arm 3 having the same vertical length is used, Different holding arms 3 may be used in combination, and the holding arm 3 may be attached to the support member 2 for a long holding time when the same structure is used and when the holding arms 3 having different lengths are used in combination. The mounting of the arm can be another structure.

  FIGS. 1 to 5 show an example in which the holding arms 3 having different lengths are used in combination, and the same structure is adopted for attaching each holding arm 3 to the support member 2.

  In the example shown in FIGS. 1 to 5, the holding arm 3 is attached to the support member 2 in such a manner that the support member 2 has a horizontal support beam at the lower end of the suspension shaft 5 that is long in the vertical direction and connects the wire of the crane to the upper end. 6 and a horizontal arm 7 at the upper end. The support beam 6 and the horizontal arm 7 project from the suspension shaft 5 so as to be perpendicular to each other in four directions in a plane, and are sandwiched between the support beams 6. 3 is attached, and sandwiching arms 3 attached to both ends of the support beam 6 aligned on the same horizontal axis are paired in an opposing manner.

  As shown in FIG. 5, each sandwiching arm 3 has a plate shape that is long in the vertical direction, and mounting arms 8 that protrude toward the counterpart sandwiching arm are fixed to both side positions of the upper and lower intermediate portions. Thus, the mounting arm 8 is externally fitted to both side surfaces of the support beam 6 using a square shaft member, and the support beam 6 and the mounting arm 8 are coupled by a pin 9 that can be inserted and removed, whereby the sandwiching arm 3 has the pin 9 attached. It is attached to be swingable as a fulcrum.

  The pair of sandwiching arms 3 have the same length. In the illustrated case, two pairs of a pair of long sandwiching arms 3a and a pair of paired short sandwiching arms 3b are used. Yes.

  The upper end of each sandwiching arm 3 and the horizontal arm 7 positioned immediately above are coupled by a hydraulic cylinder 4, and the sandwiching arm 3 swings by extending and contracting the hydraulic cylinder 4, and the pair of sandwiching arms 3 is spaced from the lower end. Will open and close. The horizontal arm 7 may be provided with a stabilizer 7a at the tip thereof to stabilize the vertical posture of the lifting device 1 in the suspended state when the lifting device 1 is inserted into a casing described later.

  A plurality of mounting holes 10 are provided along the length direction of the support beam 6, and when mounting the holding arm 3 to the support beam 6 with the pins 9, the mounting holes 10 are selected to arrange the paired holding arms 3. The interval is changed in a plurality of stages so that the gripping diameter by the holding arm 3 can be adjusted.

  In the case shown in the figure, three mounting holes 10 are provided in the support beam 6 so that the arrangement interval of the pair of sandwiching arms 3, that is, the grip diameter can be changed in three stages. The clamping arm 3 is attached to the outermost mounting hole 10 and the gripping diameter is maximum. FIG. 7B shows the clamping arm 3 attached to the mounting hole 10 located in the middle and the gripping diameter is intermediate. FIG. 7C shows a case where the holding arm 3 is attached to the innermost mounting hole 10 and the gripping diameter is the smallest.

  Further, in the mounting hole 10 provided in the support beam 6, the mounting hole 10 that is not used for mounting the clamping arm 3 is closed with the reinforcing pad 11 as shown in FIGS. The strength reduction of the support beam 6 due to the provision is prevented.

  As shown in FIGS. 4D and 4E, the reinforcing stuffing 11 sandwiches an elastic body 13 such as rubber between two metal disks 12 having an outer diameter that just fits in the mounting hole 10, and is used as a bolt. 14, the bolt 14 is tightened in a state where the reinforcing pad 11 is inserted into the mounting hole 10, and the elastic body 13 between the metal disks 12 is expanded in the mounting hole 10 to be fixed to the mounting hole 10. It is supposed to be.

  The sandwiching arm 3 that is paired with the lifting device 1 is in an open state in which the lower end is opened to the maximum in a posture that is substantially perpendicular to the top and bottom, and the support beam can be closed to the inside without opening to the outside from this open state. On both sides of 6, a stopper mechanism 15 is provided between the support beam 6 and the mounting arm 8 to keep the open state.

  As shown in FIGS. 4 and 5, the stopper mechanism 15 is formed by providing stopper projections 15 a on the horizontal plate 16 provided on the upper surface of the support beam 6 and the upper and lower opposing surfaces of the mounting arm 8. 15a is, for example, a case where the clamping arm 3 is attached to any mounting hole 10 by using a head by screwing a bolt and setting the number of stopper projections 15a provided on either one to the same number as the mounting hole 10 However, when the holding arm 3 is opened, the upper and lower stopper projections 15a come into contact with each other, so that the posture in which the vertical length direction of the holding arm 3 is set in the vertical direction is maintained.

  The number of the upper and lower stopper projections 15a is not limited to the above, and the arrangement and number are set so that the holding arm 3 is in contact with each other in the open state regardless of the mounting hole 10 attached to it. do it.

  Therefore, when the hydraulic cylinder 4 that opens and closes the clamping arm 3 is contracted to open the clamping arm 3, the open state can be mechanically secured by the stopper mechanism 15, and the posture accuracy when the clamping arm 3 is open is improved. In addition, the hydraulic control mechanism for expanding and contracting the hydraulic cylinder 4 can be simplified.

  Each hydraulic cylinder 4 individually swings the holding arm 3. With respect to the gripping direction, the lower end of the holding arm 3 exceeds the vertical axis of the support member 2 and the other holding arm 3 A swing angle that is located on the side can be provided.

  In this way, not only circular columnar underground obstacles but also planar eccentric shapes or irregularly shaped underground obstacles can be grasped.

  Each clamping arm 3 is provided with an inward gripping claw 17 projecting toward the counterpart clamping arm at the lower end, and the gripping claw 17 provided on the long clamping arm 3a simply grabs a ground obstacle. However, it has a blade function for cutting the underground obstacle from the surroundings by rotating around the underground obstacle while applying an inward gripping force to grip the underground obstacle.

  In addition, the long clamping arm 3a and the short clamping arm 3b are aligned at the upper end height position so that the lower end of the long clamping arm 3a is positioned below the lower end of the short clamping arm 3b. By applying the rotation and the gripping force, the ground claw 17 provided at the lower end cuts the ground obstacle from the surroundings and lifts the ground ground obstacle.

  The short clamping arm 3b controls the cylinder so as not to give a gripping force when applying rotation, and the gripping claw 17 provided at the lower end performs a function of only gripping an underground obstacle.

  In the lifting device 1, although not shown in the drawings, the holding arms 3 of each set having the same vertical length may be used so that the four gripping positions by the gripping claws 17 are located on the same circumference. In this case, a cutter function may be given to the gripping claws 17 of the holding arms 3.

  Further, depending on the condition of the underground obstacle to be grasped, one of the paired holding arms 3 is fixedly arranged in a vertical posture so as not to swing with respect to the support member 2, and only the other holding arm 3 is swung. A structure that can be moved can also be adopted.

  Further, although not shown, a lifting device employing an odd number of holding arms 3 can be used, and each holding arm 3 has a radial arrangement with respect to the vertical axis of the support member 2 and is attached to the support member 2. By selecting the mounting hole 10, the gripping diameter can be changed by gathering or separating the holding arm 3 with respect to the vertical axis of the support member 2.

  FIG. 6 shows an example of a mounting structure in which the strength of the sandwiching arm 3a itself is improved by changing the shape of the long sandwiching arm 3a. In addition, the attachment structure with respect to the supporting member 2 of the short clamping arm 3b is the same as the example of FIG. 1 thru | or FIG.

  In FIG. 6, the support beam 6 for attaching the long holding arm 3a is arranged in parallel on both sides so as to intersect with the upper support beam 6 of the short holding arm 3b, as shown in FIG. 6 (b). The long holding arm 3a is formed to have a wide width from the upper part to the lower part so that the upper part has a width corresponding to the distance between the two side support beams 6, and to form a circular arc as shown in FIG. 6C. The mounting arms 8 are fixed to both sides of the upper portion, and the mounting arms 8 are attached to the corresponding support beams 6 with the pins 9 to be swingable. The long holding arm 3a is an upward facing portion provided at the center of the upper end. The hydraulic cylinder 4 is connected to the bracket 3c, and an opening / closing motion is provided with the pins 9 on both sides having a coaxial arrangement.

  In the case of the long holding arm 3a having a wide width as described above, since the lower end is wide as shown in FIGS. 6B and 6C, a plurality of gripping claws 17 provided at the lower end are fixed in the circumferential direction. ing.

  Thus, by making the long holding arm 3a arc-like wide, it is possible to improve the strength in the gripping direction and the rotating direction of the long holding arm 3a.

  Examples of underground obstacles to be removed using the above-described underground obstacle lifting device 1 include piles (cast-in-place piles) and existing foundations buried in the ground, and removal for removing them. For the construction of the method, together with the lifting device 1 of the present invention, the casing 21 shown in FIGS. 8 to 10 and the excavating glass raising machine 22 incorporated into the casing 21 as necessary are used.

  The casing 21 has a cylindrical shape made of steel that is long in the vertical direction. As shown in FIG. 8, a plurality of tip bits 23 are provided at the lower tip, and a plurality of inner bits 24 and a rotation transmission member 25 are provided on the inner peripheral surface. As shown in FIG. 11, the casing driver 26 installed on the ground is held vertically to give rotation, propulsion and pulling force, and the outer peripheral surface of the pile is directly cut off, or the surrounding ground of the pile and the existing foundation are cylindrical. Will be excavated.

  Each inner bit 24 provided on the inner peripheral surface of the tip of the casing 21 protrudes from the inner periphery of the casing 21 toward the center as shown in FIGS. Are arranged at predetermined intervals, and the inner bits 24 are arranged at different positions in the axial direction.

  Each of the inner bits 24 is positioned at the lowest position in the axial direction of the casing 21 and has the lowest protruding height. The other inner bits 24 are arranged in the rotational direction of the casing 21 with reference to the lowermost inner bit 24. It is set so that the protrusion height becomes higher as it is arranged at the upper part in the axial direction along the upper part along the axial direction. FIG. 8D shows an arrangement in which parts of the inner bits 24 provided on the inner periphery of the casing 21 are partially overlapped when viewed in a straight line.

  As shown in FIG. 8 (d), the inner bit 24 adjacent to the rotation direction of the casing 21 is arranged so that the upper end and the lower end of the excavation locus wrap. When excavation is performed by rotating 21, a cylindrical excavation space corresponding to the projection amount of the inner projection 24 having the maximum projection amount is excavated on the inner peripheral side of the casing 21.

  The casing 21 is a fast casing, and is rotated and propelled and withdrawn by a casing driver 26 installed on the ground. The casing 21 is used to a required length by sequentially adding the upper casing with the progress of excavation.

  When the above-mentioned underground obstacle is a pile, there are multiple types of piles with different diameters. The diameter of the casing 21 to be used is also selected according to this, and multiple piles with different inner diameters are prepared to accommodate piles with different diameters. As for the diameter of the casing 21 used for removing the pile, there is a limit on the upper limit from the viewpoint of production, strength, handling, etc. Therefore, the relationship between the diameter of the casing and the pile is, for example, 3 m in diameter. The inner diameter of the casing used for the pile with the largest diameter is almost the same as the outer diameter of the pile, and when the pile is smaller than the largest diameter, the tip of the inner bit with the maximum protruding amount approaches the outer circumference of the pile Such a casing having an inner diameter larger than that of the pile is used.

  Therefore, when excavating a pile with a casing, the inner bit of the casing is excavated by directly scraping the outer periphery of the pile in the state where the casing 21 is coaxially fitted to the pile, and the outer diameter of the pile is cut. For small diameter piles, the ground around the pile is excavated by the inner bit of the casing. In any case, if the pile is inclined, the inner casing of the casing The bit directly cuts the outer periphery of the pile.

  The rotation transmitting member 25 provided on the inner peripheral surface of the casing 21 is formed by a plate that protrudes from the inner peripheral surface of the casing 21 toward the center as shown in FIGS. 8A and 8B. Is the same level as the inner bit with the maximum protruding amount described above, and is fixed to at least two positions on the inner peripheral surface of the casing 21 in accordance with the number of long holding arms 3a in the lifting device 1, for example.

  When the lifting device 1 is inserted into the casing 21, the lower end of the long holding arm 3a is brought to the position of the rotation transmitting member 25, and the casing 21 is rotated in this state, the side of the holding arm 3a having the long holding member 3a is rotated. The rotation of the casing 21 is transmitted to the lifting device 1.

  Further, as shown in FIG. 12B, as a means for rotating the lifting device 1 inserted into the casing 21 integrally with the casing 21, a lifting device gripper 27 is fixed to the upper portion of the support member 2, The lifting device 1 can be rotated integrally with the casing 21 by enlarging the gripper 27.

  The excavation glass raising machine 22 to be inserted into the casing 21 is for taking out excavation glass generated by excavation by the tip bit 23 and the inner bit 24 of the casing 21 by rotating integrally with the casing 21 to the ground. 9 and 10, an outer diameter cylindrical body 28 that is accommodated with a small gap with respect to the inner diameter of the casing 21, a top plate 29 that closes the upper end of the cylindrical body 28, and the top plate 29 is formed by a suspension shaft 31 that passes through the center of 29 so as to be movable up and down, and is provided with a stopper 30 for retaining it in the middle of the lower portion, and a receiving plate 32 attached to the lower end of the suspension shaft 31. Has been.

  The cylindrical body 28 is provided with spiral members 33 and 34 for pushing up the excavation glass on the inner peripheral surface and the outer peripheral surface, respectively. The spiral member 33 on the inner peripheral surface is wide and the spiral member 34 on the outer peripheral surface. The width is set narrow, and a number of bits 35 are fixed to the lower end of the cylindrical body 28.

  In order to rotate the excavating glass raising machine 22 inserted into the casing 21 integrally with the casing 21, as shown in FIG. 10, the rotation transmitting member 25 fixed to the inner periphery of the casing 21 is engaged with the bit 35 and rotated. As shown in FIG. 11, the excavator raising machine gripper 36 is fixed to the upper part of the cylindrical body 28, and the gripper 36 is enlarged in the casing 21 so as to rotate integrally. It is also possible to employ both or one of the gripper 36 and the rotation transmission member 25.

  In addition, when transmitting rotation using the rotation transmission member 25 and the bit 35, as shown in FIG. It is preferable to provide an inclined surface on which a force acts so that the cylindrical body 28 does not escape upward during transmission of rotation.

  Further, the thickness of the bit 35 and the total width of the spiral members 33 and 34 provided on the inner and outer periphery of the cylindrical body 28 are set so as to be within the excavation width by the tip bit 23 and the inner bit 24 provided on the inner periphery of the casing 21. ing.

  Next, an example of a method for removing an underground obstacle implemented using the lifting device 1 of the present invention will be described.

  As shown in FIG. 11 (a), a casing 21 having an inner diameter corresponding to the outer diameter of the pile a is built in a casing driver 26 installed on the ground to be arranged coaxially with the pile a, and suspended in the casing 21 by a crane. The lowered excavator raising machine 22 is inserted to a depth position where the lower end bit 35 engages with the rotation transmitting member 25, and the excavator raising machine gripper 36 is expanded so that the excavator raising machine 22 is inserted into the casing 21. In this state, rotation and propulsive force are applied to the casing 21, and the excavation lifter 22 is also integrated by fixing with the excavator lifter gripper 36 and engaging the bit 35 and the rotation transmission member 25 in the rotation direction. And the outside of the pile a is excavated with the tip bit 23 and the inner bit 24 of the casing 21.

  When the casing 21 enters the ground with rotation and driving force, the tip bit 23 and the inner bit 24 excavate the outside of the pile a into a cylindrical shape. At this time, in the case of the pile a having the maximum diameter, the tip bit of the casing 21 is excavated. 23 and the inner bit 24 directly cut the outer periphery of the pile a to reduce the diameter of the pile a. In the case of the pile a having a diameter smaller than the maximum diameter, the tip bit 23 and the inner bit 24 of the casing 21 excavate the ground around the pile a. In any case, excavation glass b is generated by excavation.

  In the excavation gear raising machine 22 that rotates integrally with the casing 21 and enters the ground, inner and outer spiral members 33 and 34 provided on the cylindrical body 28 send the excavation glass b upward, and a receiving plate 32 that stands by at the lowered position. It accumulates on the top.

  In this way, by sending the excavation glass upward by the excavation glass raising machine 22, it is possible to ensure that the cylindrical excavation space excavated on the outer periphery of the pile a is not filled with the excavation glass b. The part surrounded by this excavation space is exposed.

  When the casing 21 enters the ground by a predetermined length, as shown in FIG. 11B, the casing 21 is stopped, and the excavator raising machine 22 is moved to the casing while the excavator raising machine gripper mechanism 36 is reduced. As shown in FIG. 11C, the excavation glass raising machine 22 with the excavation glass b accumulated is lowered to a position away from the casing 21 and the excavation glass b is processed.

  As shown in FIG. 12A, the inside of the casing 21 after taking out the excavating glass raising machine 22 is in a state where the pile is exposed in the cylindrical excavating space, and the excavating glass raising machine 22 removes the excavating glass b. This ensures that the excavation space is empty.

  In this state, the lifting device 1 is suspended by a crane, and as shown in FIGS. 12B and 13, the lifting device 1 is inserted into the casing 21, and the opened holding arm 3 is made to enter the excavation space. The lifting device 1 is fixed to the casing 21 by enlarging the gripper 27 for the lifting machine in a state where the support beam 6 faces the upper end of the shaft and the lower end of the long holding arm 3 a is engaged with the rotation transmission member 25. .

  The lifting device 1 sets the gripping diameter of the clamping arm 3 in advance according to the outer diameter of the pile a, and contracts the hydraulic cylinder 4 when inserted into the casing 21, and the clamping mechanism 3 is operated by the stopper mechanism 15. Therefore, the holding arm 3 can be smoothly advanced into the excavation space.

  When the casing 21 into which the lifting device 1 is inserted is rotated, the casing 21 and the lifting device 1 rotate together. When the hydraulic cylinder 4 of the long clamping arm 3a is extended along with this rotation, the long clamping arm 3a has a lower end. The gripping claws 17 grip the pile a by moving toward the inside, and the outer periphery of the pile a is rotated by the rotation.

  In the long holding arm 3a, when the gripping claw 17 rotates around the outer periphery of the pile a while applying pressure to grip the pile a to the gripping claw 17 by the hydraulic cylinder 4, the pointed gripping claw 17 having a blade function is As shown in FIG. 13, the casing 21 is rotated at a fixed position until the cut cuts the reinforcing bar c embedded near the outer periphery of the pile a as shown in FIG. Continue to apply rotation and gripping force.

  When the lifting device 1 rotates, the rotation transmitting member 25 engages with a position near the lower end of the long holding arm 3a, and the rotation of the casing 21 is directly transmitted to the lower end side of the long holding arm 3a. It is possible to prevent bending, and the pile a can be reliably cut with the gripping claws 17.

  When the reinforcing bar c is cut by cutting with the gripping claws 17, the casing 21 is pulled up while being rotated by the casing driver 26, and the lifting device 1 that holds the pile a with the long holding arm 3 a is pulled up integrally by a predetermined stroke, An impact is applied to the portion of the concrete having a reduced diameter surrounded by the cut of the pile a, and the pile a is broken off from the cut portion by this impact.

  When the pile a is broken, the casing 21 is stopped, the short clamping arm 3b is gripped by the hydraulic cylinder 4, and the gripper 27 is lifted with the long clamping arm 3a and the short clamping arm 3b being held. If the lifting device 1 is released from the casing 21 with a crane after being reduced and released from the casing 21, the broken pile a can be lifted together and taken out of the casing 21.

  As described above, when the pile a is broken by a predetermined length and removed from the casing 21, the above-described process is repeated, and the excavating glass raising machine 22 is inserted and fixed again in the casing 21. The casing 21 is rotated and propelled by the excavation of the casing 21 by a predetermined length by excavating the outside of the pile a with the tip bit 23 and the inner bit 24. Push up.

  When the casing 21 enters a predetermined length, the rotation and propulsive force are stopped, and the excavating glass raising machine 22 is removed from the casing 21 to take out the excavating glass b to expose the pile a to the surrounding excavation space. Then, the lifting device 1 with each holding arm 3 opened is inserted into the casing 21, and the long holding arm 3a is closed and the pile a is gripped, and the casing 21 and the lifting device 1 are rotated together to pile the pile a. After cutting, the pile a is broken from the cut portion, and the lifted device 1 is pulled out of the casing 21 to take out the pile a.

  By repeating such steps, the entire length of the pile a can be removed by sequentially removing the pile a from the top every predetermined length. When the entire length of the pile a is removed, the inside of the casing 21 is filled with fluidization preventing soil. After that, the casing 21 is removed from the ground.

  In addition, as another example of the method of removing the underground obstacle using the lifting device 1 described above, when the underground obstacle is a pile, the excavation glass generated by the excavation is soft only with the soil component, and the lifting device 1 When the holding arm 3 can be advanced into the excavation gull due to the weight of the excavation gull, the construction method can be implemented without using the excavation gall raising machine 22, and in this case, the excavation process is installed. The lifting device 1 is suspended in the casing 21 in an open posture, inserted and fixed, and the same operation as described above is performed except that the casing 21 and the lifting device 1 are rotated together.

  Moreover, the removal method in the case where the underground obstacle is a concrete foundation made of concrete may be employed in any of the above-described method using the excavating glass raising machine 22 and the method omitting the use of the excavating glass raising machine 22. it can.

  In the existing foundation, the shape of the concrete in the excavation part may not be circular depending on the location. In such a case, excavation by the casing 21 is performed until it penetrates the existing foundation and is inserted into the casing 21. The lifting device 1 does not perform cutting by rotation, but only needs to perform the lifting work by simply grasping the existing foundation in the casing 21, and each holding arm 3 of the lifting device 1 can be opened and closed independently. The operating range toward the inside of the gripping claw 17 is limited by the stroke of the hydraulic cylinder 4, but can pass through the vertical axis of the support member 2 to the opposite side, so that the circular axis It can be grasped without any trouble even on a prefabricated foundation that is eccentric or planar in shape other than the shape.

DESCRIPTION OF SYMBOLS 1 Lifting device 2 Support member 3 Holding arm 3a Long holding arm 3b Short holding arm 3c Bracket 4 Hydraulic cylinder 5 Hanging shaft 6 Support beam 7 Horizontal arm 7a Stabilizer 8 Mounting arm 9 Pin 10 Mounting hole 11 Reinforcement padding 12 Metal disc 13 Elastic body 14 Bolt 15 Stopper mechanism 15a Stopper projection 16 Horizontal flat plate 17 Grasp claw 21 Casing 22 Excavation lifter 23 End bit 24 Inner bit 25 Rotation transmission member 26 Casing driver 27 Lifter gripper 28 Cylindrical body 29 Top plate 30 Stopper 31 Suspension shaft 32 Receiving plate 33 Spiral member 34 Spiral member 35 Bit 36 Gripper for excavating glass raising machine a Pile b Excavating glass c Reinforcing bar

Claims (3)

A pair of long holding arms and a pair of short holding arms sandwiching the vertical axis of the supporting member are attached to a supporting member suspended and held by a wire such as a crane, and the necessary holding arms are extended and driven. In the lifting device of underground obstacles that can be opened and closed with
The mounting position of each holding arm with respect to the support member can be adjusted along the opening and closing direction of the holding arm,
The pair of long holding arms is formed to have a wide and flat circular arc, and an inward gripping claw is provided at a lower end of the arm, and the pair of long holding arms is closed by the telescopic drive unit. The sandwiching arm has a blade function of cutting around the underground obstacle by rotating in a state where the gripping claw grips the underground obstacle,
An underground obstruction broken by the notch can be grasped by the pair of long holding arms and the set of short holding arms closed by the telescopic drive . Lifting device.   The mounting of the holding arm to the support member can be adjusted by providing a plurality of mounting holes in the support member along the opening and closing direction of the holding arm, and selecting a mounting hole for locking the mounting arm provided in the holding arm. The apparatus for lifting an underground obstacle according to claim 1, wherein:   The underground obstacle lifting device according to claim 1 or 2, wherein a stopper mechanism is provided between the support member and the holding arm to hold the posture of the holding arm in the open state.

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