JP5665568B2 - Steel pipe press-fitting and drawing device - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a steel pipe press-fitting / drawing device used for press-fitting and drawing of steel pipes and steel pipe piles for placing concrete piles in building and civil engineering foundation work.

  Patent Document 1 discloses a steel pipe press-fitting / pulling-out device for press-fitting and pulling steel pipes into the ground. This steel pipe press-fitting / drawing apparatus includes a base having a penetrating portion through which the steel pipe is passed. The base is provided with a plurality of lifting mechanisms composed of hydraulic cylinders on the outer periphery of the penetrating portion. These elevating mechanisms are provided with a tightening holding mechanism for tightening and holding steel pipes. The tightening and holding mechanism is rotatable about the axis of the steel pipe, and the rod of the drive cylinder for driving the rotation is connected by a universal joint. The cylinder case of the drive cylinder is similarly connected to the upper part of the base by a universal joint.

  The steel pipe press-fitting / pulling-out device of Patent Document 1 holds a steel pipe by a tightening holding mechanism in a state where the tightening holding mechanism is moved upward by an elevating mechanism. Then, by advancing and retracting the rod by the drive cylinder, the tightening and holding mechanism is gradually lowered by the elevating mechanism while the tightening and holding mechanism is rotated forward and backward. As a result, the steel pipes are pressed into the ground. On the contrary, the steel pipes are held by the tightening holding mechanism in a state where the tightening holding mechanism is moved downward by the lifting mechanism. The tightening and holding mechanism is gradually raised by the elevating mechanism while the tightening and holding mechanism is rotated forward and backward by the drive cylinder. Thereby, steel pipes are pulled out from the ground.

  However, the steel pipe press-fitting / pulling-out device of Patent Document 1 is configured so that a tightening holding mechanism is rotatably disposed in the lifting mechanism, and this tightening holding mechanism is rotated forward and reverse by a drive cylinder. A load due to a driving force that rotates the holding mechanism acts on the connecting portion between the elevating mechanism and the base. Therefore, in order to prevent destruction of the connecting portion between the lifting mechanism and the base, the lifting mechanism needs to be swingably connected to the base. As a result, when starting to press-fit the steel pipes, it was difficult to hold the steel pipes vertically, and there was a problem that workability was poor.

  On the other hand, Patent Document 2 discloses a steel pipe press-fitting / pulling-out device that has good workability when holding a steel pipe perpendicular to the ground and that can improve the efficiency of press-fitting. In the steel pipe press-fitting / pulling-out device, an elevating mechanism is fixed to the outer periphery of the first through portion of the base. The lifting mechanism is connected to a lifting frame having a second penetration part through which the steel pipes are penetrated, and a rotatable frame is disposed on the lifting frame. The rotating frame is provided with a third penetration part through which the steel pipes are penetrated, and a tightening holding mechanism for holding the steel pipes is disposed so as to be positioned above the third penetration part. A gear portion is provided on the outer peripheral portion of the rotating frame, and a gear connected to the output shaft of the hydraulic motor is engaged with the gear portion.

  The steel pipe press-fitting / pulling-out device of Patent Document 2 holds steel pipes by a tightening holding mechanism in a state where the lifting frame is moved upward by the lifting mechanism. Then, the elevating frame is gradually lowered by the elevating mechanism while rotating the rotating frame in a predetermined direction by the hydraulic motor. As a result, the steel pipes are pressed into the ground. Conversely, in a state where the lifting frame is moved downward by the lifting mechanism, the steel pipes are held by the tightening holding mechanism and the lifting mechanism is gradually raised while rotating the rotating frame by the hydraulic motor. Thereby, steel pipes are pulled out from the ground.

  However, the steel pipe press-fitting / extracting device of Patent Document 2 requires a large number of hydraulic motors to rotate the rotating frame. Accordingly, the pump unit for operating these hydraulic motors is increased in size. In addition, there are a large number of pipes for connecting the pump unit to the hydraulic motor and hydraulic cylinder. As a result, there is a problem that the manufacturing cost of the apparatus becomes high. Further, since the total weight of the entire apparatus is heavy, a large trailer is required to transport the apparatus. As a result, there is a problem that the device must be disassembled and transported and assembled and used on the site, and the device must be disassembled and removed from the site for use on the site that needs to pass through a narrow road.

Japanese Utility Model No. 5-12350 Japanese Utility Model Publication No. 63-198631

  An object of the present invention is to provide a lightweight and inexpensive steel pipe press-fitting and drawing device that can press-fit and pull steel pipes with good workability.

In order to solve the above-described problem, a steel pipe press-fitting / drawing device according to the present invention is provided with a base having a first penetration part through which a steel pipe penetrates, and an outer peripheral part of the first penetration part of the base. Three or more elevating mechanisms having elevating members that are advanced and retracted along the axis of the steel pipes that have penetrated the through part, and the steel pipes that are connected to the elevating member of the elevating mechanism and penetrate the first through part An elevating frame having a second penetrating portion through which the steel pipes are penetrated, and a third penetrating portion through which the steel pipes are penetrated, with the axis of the third penetrating portion at the top of the second through portion of the elevating frame. A pivot frame disposed rotatably; a fixing member fixed to an upper portion of the pivot frame; a pair of fastening members pivotally disposed at both ends of the fixed member; the member said clamping an outer peripheral portion of the steel tubing which passed through the through portion A holding mechanism clamping and a cylinder clamping holding wearing because, wherein is rotatably disposed in the horizontal direction on the lifting frame, the tip of the reciprocating driven drive rod coupled to said pivoting frame And a drive cylinder.

  In the steel pipe press-fitting / pulling-out device according to the present invention, the elevating frame is provided with a rotating frame and a driving cylinder for rotating the rotating frame, so that the driving cylinder can be rotated only in the horizontal direction. It is connected to the elevating frame and the rotating frame. As a result, the rotation angle of the drive cylinder can be increased and the driving force can be efficiently transmitted to the rotation frame. Therefore, useless driving energy loss can be suppressed. Moreover, since the load to the raising / lowering mechanism for raising / lowering the raising / lowering frame can be eliminated, this raising / lowering mechanism can be fixed with respect to a base so that it can raise / lower along the axis of steel pipes. Therefore, when starting to press-fit the steel pipes, the steel pipes can be easily held vertically, so that workability can be improved.

  In addition, since a general-purpose hydraulic cylinder that moves the rod back and forth can be used as the drive cylinder that rotates the rotation frame, the pump unit that drives the drive cylinder may be small. As a result, the cost of the entire apparatus can be reduced, and the weight of the entire apparatus can be reduced. Therefore, it can be transported by a small trailer. As a result, even in the field where it is necessary to pass through a narrow road, the apparatus can be transported without disassembling, and the convenience of use can be greatly improved.

In the steel pipe press-fitting / pulling-out device, the elevating mechanism includes an elevating rod having an upper end connected to the elevating member, and a cylinder case forming a first hydraulic chamber in which a lower portion of the elevating rod is hermetically arranged. It is preferable that a first oil passage that includes a cylinder and that supplies and discharges hydraulic oil to and from the first hydraulic chamber is provided in a wall portion of a cylinder case of the elevating cylinder. In this way, since the lateral width of the lifting mechanism can be reduced, the entire apparatus can be reduced in size.
The elevating cylinder further includes an adjustment rod that protrudes downward from the base and can adjust an installation state of the base with respect to an installation surface, and an upper portion of the adjustment rod serves as a second hydraulic chamber of the cylinder case. It is preferable to provide a second oil passage that is hermetically arranged and that supplies and discharges hydraulic oil to and from the second hydraulic chamber in the wall of the cylinder case. In this way, the apparatus can be reliably placed horizontally even if the installation surface is uneven. Further, since this level adjusting cylinder is provided integrally with the elevating cylinder, the load applied to the base when the steel pipes are pulled out can be eliminated. As a result, the reaction force from the ground can be directly received, so that the work efficiency can be improved.

  In the steel pipe press-fitting / drawing apparatus of the present invention, the drive cylinder is connected to the lift frame and the rotation frame so as to be able to rotate only in the horizontal direction, so that the rotation angle of the drive cylinder can be increased, The driving force can be efficiently transmitted to the rotating frame. Therefore, useless driving energy loss can be suppressed. Further, since there is almost no load on the lifting mechanism due to the rotational driving of the rotating frame, the lifting mechanism can be fixed to the base. Therefore, since steel pipes can be easily held vertically, workability can be improved.

  Further, since the drive cylinder can use a general-purpose hydraulic cylinder that moves the rod back and forth, the pump unit may be small. As a result, the cost of the entire apparatus can be reduced. Accordingly, the entire apparatus can be reduced in weight, and can be transported by a small trailer, so that convenience related to transport and use can be greatly improved.

1 is a perspective view showing a steel pipe press-fitting / drawing apparatus according to an embodiment of the present invention. It is sectional drawing which shows the state which cut | disconnected the steel pipe press-fit drawing apparatus at the center. It is sectional drawing which shows the state which cut | disconnected the steel pipe press-fit drawing apparatus by the part of the raising / lowering mechanism. It is sectional drawing which shows the state which raised the raising / lowering mechanism. It is a top view which shows a steel pipe press-fit drawing apparatus. It is a top view which shows the state which extended the clamping holding | maintenance mechanism. It is a top view which shows the 1st drive state which driven the drive cylinder. It is a top view which shows the 2nd drive state which driven the drive cylinder.

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

  FIG. 1 shows a steel pipe press-fitting and drawing apparatus according to an embodiment of the present invention. This steel pipe press-fitting / pulling-out device includes a base 10, an elevating mechanism 14, an elevating frame 37, a rotating frame 41, a tightening holding mechanism 44, and a pair of drive cylinders 53A and 53B. And by raising and lowering the elevating mechanism 14 to the base 10, the steel pipes can be press-fitted and pulled out with good workability.

  The base 10 is a rectangular substrate that is installed on the ground as the installation surface 1. As shown in FIG. 2, on the left side of the base 10, a first penetration portion 11 through which the steel pipe 2 is penetrated is provided with a diameter larger than the diameter of the steel pipe 2. As shown in FIG. 3, an adjustment rod disposition hole 12 for penetrating the adjustment rod 34 of the elevating cylinder 23 so as to protrude downward is provided in the outer peripheral portion of the first penetration portion 11. As shown in FIGS. 1 and 2, a weight installing portion 13 is provided on the outer peripheral portion of the base 10 to install a weight for preventing the device from being lifted by a force during press-fitting work.

  The elevating mechanism 14 elevates and lowers the elevating frame 37 while maintaining a parallel state with respect to the base 10, and is erected so as to be positioned on the outer peripheral portion of the first through portion 11 of the base 10. In the present embodiment, four are fixed at 90 ° intervals around the axis of the first penetrating part 11 so as to protrude perpendicularly (perpendicular) to the base 10. As shown in FIG. 3, the elevating mechanism 14 includes a guide post 15 that is fixed to the base 10 by bolting, an elevating member 18 disposed so as to cover the guide post 15 from above, and a guide post 15. A slide guide 21 to be inserted and an elevating cylinder 23 arranged inside the guide post 15 are provided. In addition, as long as the raising / lowering mechanism 14 is the structure which can raise / lower the raising / lowering flame | frame 37 stably, it is good also as a structure provided only 3 and good also as a structure provided 5 or more.

  The guide post 15 has a cylindrical shape provided with a mounting flange portion projecting radially outward at the lower end. A plurality of fixing holes 16 for fixing the elevating cylinder 23 inside the guide post 15 are provided at predetermined intervals in the circumferential direction. In addition, a pipe connection hole 17 for supplying and releasing hydraulic oil to and from the elevating cylinder 23 is provided at the lower portion of the guide post 15. The pipe connection holes 17 are provided so as to be located at a predetermined interval in the circumferential direction with respect to the fixing holes 16. The pipe connection holes 17 of the present embodiment are provided at four locations so as to coincide with the inlets and outlets of the oil passages 29A, 29B, 30A, 30B of the elevating cylinder 23.

  The elevating member 18 is advanced and retracted along the axis of the steel pipe 2, and is fitted on the upper portion of the guide post 15. At the upper end of the elevating member 18, a rod connecting portion 19 for connecting the elevating rod 31 of the elevating cylinder 23 is provided. Further, the lower end of the elevating member 18 is provided with a first connecting portion 20 that protrudes radially outward so as to form a flange shape and is connected to the upper end surface of the elevating frame 37.

  The slide guide 21 has a cylindrical shape disposed on the guide post 15 so as to be positioned below the elevating member 18. The slide guide 21 is disposed inside the connection hole 39 of the lifting frame 37. Further, the inner diameter of the slide guide 21 is slightly larger than the outer diameter of the guide post 15 and is in sliding contact with the guide post 15. The lower end of the slide guide 21 is provided with a second connecting portion 22 that protrudes radially outward so as to form a flange shape and is connected to the lower end surface of the elevating frame 37.

  The elevating cylinder 23 has a cylinder case 24, an elevating rod 31 for elevating the elevating member 18, and a level adjusting rod 34 for installing the base 10 horizontally. That is, the elevating cylinder 23 of this embodiment is composed of one cylinder case 24 and two rods 31 and 34.

  Inside the cylinder case 24, a first hydraulic chamber 25 in which the lower portion of the lifting rod 31 is hermetically arranged is formed on the upper side, and a second hydraulic chamber 26 in which the upper portion of the adjusting rod 34 is hermetically arranged is formed on the lower side. ing. The boundary portions of these hydraulic chambers 25 and 26 are partitioned by a partition wall 27. The first hydraulic chamber 25 and the second hydraulic chamber 26 are formed such that the first hydraulic chamber 25 has a larger dimension in the axial direction, that is, a distance in which the rods 31 and 34 can be advanced and retracted. As shown in the lifting cylinder 23 on the right side in FIG. 3, a fixing pin shaft hole 28 that matches the fixing hole 16 of the guide post 15 is provided in the lower part of the outer wall portion of the cylinder case 24. Further, as shown in the lift cylinder 23 on the left side in FIG. 3, first oil passages 29 </ b> A and 29 </ b> B for supplying and releasing hydraulic oil to and from the first hydraulic chamber 25 are provided in the outer wall portion of the cylinder case 24, and the second hydraulic chamber. 26 is provided with second oil passages 30A and 30B for supplying and releasing hydraulic oil. The first oil passage 29A communicates with the lower portion of the first hydraulic chamber 25, and advances the lifting rod 31 by supplying hydraulic oil, and retreats the lifting rod 31 by discharging hydraulic oil. The first oil passage 29 </ b> B communicates with the upper portion of the first hydraulic chamber 25, retracts the lifting rod 31 by supplying hydraulic oil, and advances the lifting rod 31 by discharging hydraulic oil. The second oil passage 30A communicates with the upper portion of the second hydraulic chamber 26, and advances the adjustment rod 34 by supplying hydraulic oil, and retreats the adjustment rod 34 by discharging hydraulic oil. The second oil passage 30B communicates with the lower portion of the second hydraulic chamber 26, and retracts the adjustment rod 34 by supplying hydraulic oil, and advances the adjustment rod 34 by discharging hydraulic oil. These oil passages 29A, 29B, 30A, and 30B are formed by making holes in the cylinder case 24 linearly and burying and closing predetermined portions. The oil passages 29A, 29B, 30A, and 30B are connected to the pump unit 57 through pipes (not shown) through the pipe connection holes 17.

  The lifting rod 31 is advanced and retracted with respect to the cylinder case 24 by supplying and discharging hydraulic oil to and from the first hydraulic chamber 25. The lifting rod 31 is provided with a connected portion 32 connected to the rod connecting portion 19 of the lifting member 18 at the upper end protruding from the cylinder case 24. Further, the lifting rod 31 is provided with a piston 33 in pressure contact with the inner wall of the first hydraulic chamber 25 in the vicinity of the lower end disposed inside the first hydraulic chamber 25. The piston 33 is located at the lower end operating position where the lifting rod 31 is most retracted and above the entrance / exit of the first oil passage 29A, and at the upper end operating position where the lifting rod 31 is most advanced, It is configured to be located below the entrance / exit.

  The adjustment rod 34 is advanced and retracted with respect to the cylinder case 24 by supplying and discharging hydraulic oil to and from the second hydraulic chamber 26. The adjustment rod 34 has a lower end protruding from the cylinder case 24 disposed in the adjustment rod arrangement hole 12 of the base 10. A buffer member 35 that is pressed against the installation surface 1 is disposed at the lower end of the adjustment rod 34. Further, the adjustment rod 34 is provided with a piston 36 in pressure contact with the inner wall of the second hydraulic chamber 26 in the vicinity of the upper end disposed inside the second hydraulic chamber 26. The piston 36 is located at the upper end operating position where the adjustment rod 34 is most retracted, and is located below the entrance / exit of the second oil passage 30A, and at the lower end operating position where the adjustment rod 34 is most advanced, the second oil passage 30B. It is comprised so that it may be located above the entrance / exit of this.

  The elevating frame 37 is a rectangular substrate that is connected to the elevating member 18 via the slide guide 21 so as to be positioned parallel to the base 10. The lifting frame 37 is provided with a second through portion 38 through which the steel pipe 2 passes so as to be in the same axis as the first through portion 11 of the base 10. A connection hole 39 in which the slide guide 21 is disposed is provided in the outer peripheral portion of the second through portion 38. As shown in FIG. 2, an inner ring member 40 constituting a rolling bearing for rotatably supporting the rotating frame 41 is disposed outside the second through portion 38.

  The rotating frame 41 is an annular shape that is rotatably disposed above the second through portion 38 of the elevating frame 37. The center of the rotating frame 41 constitutes a third penetration part 42 through which the steel pipe 2 is penetrated. The rotating frame 41 is provided with an outer ring member 43 constituting a rolling bearing so as to be positioned below the outer peripheral portion of the third through portion 42. The outer ring member 43 is positioned outside the inner ring member 40 of the lifting frame 37, and a spherical rolling element is disposed between the outer ring member 43 and the inner ring member 40. Thereby, the rotation frame 41 is supported so as to be rotatable about the axis of the third through portion 42.

  The tightening holding mechanism 44 is disposed in the upper part of the rotating frame 41 and has a C-shape in a plan view that tightens and holds the outer peripheral portion of the steel pipe 2 that has penetrated the third through portion 42. As shown in FIG. 1, the tightening holding mechanism 44 includes a fixing member 45 fixed to the rotating frame 41, and a pair of tightening members 47 </ b> A disposed rotatably at both ends of the fixing member 45. 47B. The fixing member 45 is formed of an arcuate frame having the same inner diameter as the outer diameter of the steel pipe 2. At both ends of the fixing member 45, bearing portions 46A and 46B for rotatably connecting the fastening members 47A and 47B are provided. The fastening members 47 </ b> A and 47 </ b> B are arcuate frames having the same inner diameter as the inner diameter of the fixing member 45. Bearing parts 48A and 48B that are rotatably connected to the bearing parts 46A and 46B are provided at one ends of the fastening members 47A and 47B. A tightening hydraulic cylinder 49 is provided at the free end of the tightening members 47A and 47B on the opposite side of the bearing portions 48A and 48B. The tightening hydraulic cylinder 49 is rotatably connected to a mounting shaft 50A disposed on one tightening member 47A. Further, the rod of the tightening hydraulic cylinder 49 is rotatably connected to an attachment shaft 50B disposed on the other tightening member 47B. Furthermore, each tightening member 47A, 47B is provided with a restriction hole 51 for restricting the opening between the free ends. A restriction pin 52 is inserted into the restriction hole 51, and the lower end of the restriction pin 52 is connected to the rotating frame 41. In the tightening holding mechanism 44, the inner diameter of the fixing member 45 and the pair of tightening members 47A and 47B is formed to be the same as the outer diameter of the steel pipe 2, but there is a predetermined gap between the free ends of the tightening members 47A and 47B. The clearance can be adjusted by expansion and contraction of the tightening hydraulic cylinder 49. Therefore, the steel pipe 2 having the same outer diameter can be securely tightened and held.

  The drive cylinders 53 </ b> A and 53 </ b> B are hydraulic cylinders arranged on the upper part of the lifting frame 37. These drive cylinders 53 </ b> A and 53 </ b> B are arranged to be rotatable only in the horizontal direction with respect to the lifting frame 37 by the attachment member 55. Further, a connecting member 56 is attached to the distal ends of the drive rods 54A and 54B of the drive cylinders 53A and 53B. The connecting member 56 is attached to the drive rods 54A and 54B so as to be rotatable only in the horizontal direction. Further, the connecting member 56 is fixed to the rotating frame 41 so as to be positioned on the radially outer side of the bearing portions 46A and 46B of the fixing member 45.

  The rods of the elevating cylinder 23, the tightening hydraulic cylinder 49, and the drive cylinders 53A and 53B are driven forward and backward by a pump unit 57 disposed on the upper portion of the base 10.

  Next, a method for placing a concrete pile using the steel pipe press-fitting / drawing apparatus configured as described above will be described.

  First, as shown in FIG. 4, a steel pipe drawing device is disposed at a place where a concrete pile is to be placed. At this time, as shown on the left side in FIG. 4, when there is a stepped portion 1 a or the like of the installation surface 1, the adjustment rod 34 of the lifting cylinder 23 corresponding to that portion is advanced. Thereby, the base 10 of the apparatus is installed so as to be positioned horizontally with respect to the installation surface 1.

  Next, the steel pipe 2 is attached to the apparatus to perform press-fitting work. In this press-fitting operation, as shown in FIG. 5, the clamping hydraulic cylinder 49 is driven to advance the rod, and as shown in FIG. 6, the pair of clamping members 47A and 47B are rotated, and the free ends are moved. spread. Thereby, the inner peripheral part of fastening member 47A, 47B becomes larger than the internal diameter of the 3rd penetration part 42 of the rotation frame 41 located in the lower part. In this state, the steel pipe 2 is pulled up by a crane truck (not shown), and as shown in FIGS. 2 and 4, the fixing member 45 and the fastening members 47 </ b> A and 47 </ b> B, the third through portion 42 of the rotating frame 41, and the lifting frame 37. The steel pipe 2 is passed through the second through portion 38 and the first through portion 11 of the base 10.

  Moreover, as shown in FIG. 4, the raising / lowering rod 31 of each raising / lowering cylinder 23 is advanced, and the raising / lowering frame 37 is raised upwards. Then, the rod of the tightening hydraulic cylinder 49 is retracted, and the outer peripheral portion of the steel pipe 2 is tightened and held by the tightening members 47A and 47B. At this time, in this embodiment, the elevating mechanism 14 is fixed to the base 10, the elevating frame 37 is fixed to the elevating member 18 of the elevating mechanism 14, and the rotating frame 41 is attached to the elevating frame 37. Is supported rotatably, so that the steel pipe 2 held tightly does not tilt. Therefore, the steel pipe 2 can be reliably held so that the steel pipe 2 extends perpendicularly to the installation surface 1.

  Next, while the drive rods 54A, 54B of the drive cylinders 53A, 53B are driven to advance and retract, the elevating cylinder 23 is gradually retracted to lower the elevating frame 37, thereby pressing the steel pipe 2 into the ground. Specifically, as shown in FIG. 7, the drive cylinders 53A and 53B drive one drive cylinder 53A backward and drive the other drive cylinder 53B forward. Thereafter, as shown in FIG. 8, one drive cylinder 53A is driven to advance, and the other drive cylinder 53B is driven backward. Subsequently, as shown in FIG. 7, the drive cylinder 53A is driven backward, and the drive cylinder 53B is driven forward. While repeating the states of FIGS. 7 and 8, the elevating frame 37 is gradually lowered by the elevating cylinder 23.

  When the elevating frame 37 is lowered to the lower end, the fastening of the steel pipe 2 by the fastening members 47A and 47B is released, and after the elevating frame 37 is raised again to the upper end, the outer peripheral portion of the steel pipe 2 is again made by the fastening members 47A and 47B. tighten. And drive cylinder 53A, 53B and the raising / lowering cylinder 23 are driven again, and the steel pipe 2 is press-fitted in the ground. Moreover, when the steel pipe 2 is press-fitted in a certain amount into the ground, the soil inside the steel pipe 2 is taken out.

  When these steps are repeated and the steel pipe 2 is press-fitted to the desired depth and the soil inside is taken out, reinforcing bars and the like are placed inside the steel pipe 2 and raw concrete that is not solidified is cast from the upper end. Before the concrete hardens, the steel pipe 2 is pulled out.

  In this drawing operation, the lifting frame 37 is lowered to the lower end in a state where the tightening of the steel pipe 2 by the tightening members 47A and 47B is released. And the outer peripheral part of the steel pipe 2 is clamped and hold | maintained by the fastening members 47A and 47B.

  Next, the lift rod 31 of the lift cylinder 23 is gradually raised while the states of FIGS. 7 and 8 are repeated by the drive cylinders 53A and 53B. When the lifting frame 37 reaches the upper end, the tightening by the fastening members 47A and 47B is released, the lifting frame 37 is lowered to the lower end, and the outer peripheral portion of the steel pipe 2 is fastened and held by the fastening members 47A and 47B again. Thus, the drive cylinders 53A and 53B and the lift cylinder 23 are driven. By repeating this process, the entire steel pipe 2 is pulled out.

  When the drawing operation of the steel pipe 2 is completed and the cast concrete is hardened, the concrete pile is completed. In addition, in the case of a steel pipe pile, it is different only in the point which only press-fits in the ground and does not perform extraction work.

  As described above, in the steel pipe press-fitting / drawing apparatus of the present invention, the rotary frame 41 is disposed on the lifting frame 37, and the drive cylinders 53A and 53B are connected to these so as to be able to rotate only in the horizontal direction. The rotation angle of the rotation frame 41 can be increased. Therefore, the driving force of the drive cylinders 53A and 53B can be efficiently transmitted to the rotating frame 41, and loss of useless drive energy can be suppressed. Further, since the load on the lifting mechanism 14 for lifting the lifting frame 37 can be eliminated, the lifting mechanism 14 can be fixed to the base 10 so as to be lifted and lowered along the axis of the steel pipe. Therefore, when starting the press-fitting work of the steel pipe 2, the workability can be improved because the steel pipe 2 can be easily held vertically.

  The drive cylinders 53A and 53B that rotate the rotation frame 41 can be general-purpose hydraulic cylinders that advance and retract the drive rods 54A and 54B. Accordingly, a small pump unit 57 for driving the drive cylinders 53A and 53B can be used. As a result, the cost of the entire apparatus can be reduced, and the weight of the entire apparatus can be reduced, so that the apparatus can be transported by a small trailer. As a result, even in the field where it is necessary to pass through a narrow road, the apparatus can be transported without disassembling, and the convenience of use can be greatly improved.

  Further, since the cylinder case 24 of the elevating cylinder 23 is provided with oil passages 29A, 29B, 30A, 30B for supplying and releasing hydraulic oil to and from the first and second hydraulic chambers 25, 26, the lateral width of the elevating mechanism 14 is increased. Can be small. Therefore, the entire apparatus can be reduced in size. In addition, in the present embodiment, since the lifting cylinder 23 is further provided with the level adjusting rod 34 that protrudes downward from the base 10 and can adjust the installation state with respect to the installation surface 1, the installation surface 1 is surely uneven. The device can be placed horizontally. And since this adjustment rod 34 is provided in one raising / lowering cylinder 23, the load added to the base 10 at the time of extraction of steel pipes can be eliminated. As a result, the structure of the base 10 can be simplified and the reaction force from the ground can be directly received, so that the extraction work efficiency can be improved.

  Note that the steel pipe press-fitting / drawing apparatus of the present invention is not limited to the configuration of the above-described embodiment, and various modifications are possible.

DESCRIPTION OF SYMBOLS 1 ... Installation surface 1a ... Step part 2 ... Steel pipe 10 ... Base 11 ... 1st penetration part 14 ... Elevating mechanism 18 ... Elevating member 23 ... Elevating cylinder 24 ... Cylinder case 25 ... 1st hydraulic chamber 26 ... 2nd hydraulic chamber 29A, 29B ... 1st oil passage 30A, 30B ... 2nd oil passage 31 ... Lifting rod 34 ... Adjustment rod 37 ... Lifting frame 38 ... 2nd penetration part 41 ... Turning frame 42 ... 3rd penetration part 44 ... Fastening holding | maintenance Mechanism 47A, 47B ... Fastening member 49 ... Tightening hydraulic cylinder 53A, 53B ... Drive cylinder 54A, 54B ... Drive rod 57 ... Pump unit

Claims (3)

A base having a first penetration part through which the steel pipes are penetrated;
Three or more elevating mechanisms that have elevating members that are erected along the axis of the steel pipes that are erected on the outer peripheral portion of the first through portion of the base and penetrate the first through portion;
A lifting frame connected to a lifting member of the lifting mechanism, and having a second penetrating portion through which the steel pipes penetrating the first penetrating portion pass,
A rotating frame that has a third penetrating portion through which the steel pipes penetrate, and is disposed on the upper portion of the second penetrating portion of the elevating frame so as to be rotatable about the axis of the third penetrating portion;
A fixing member fixed to an upper portion of the rotating frame, a pair of fastening members rotatably disposed at both ends of the fixing member, and an outer peripheral portion of the steel pipe that penetrates the third through portion A tightening holding mechanism having a tightening cylinder for tightening and holding the tightening member by the tightening member ;
A drive cylinder disposed on the elevating frame so as to be rotatable in a horizontal direction, and connecting a tip of a drive rod driven to advance and retreat to the rotation frame;
A steel pipe press-fitting / drawing apparatus characterized by comprising: The elevating mechanism includes an elevating cylinder having an elevating rod having an upper end connected to the elevating member, and a cylinder case forming a first hydraulic chamber in which a lower portion of the elevating rod is hermetically disposed.
2. The steel pipe press-fitting / drawing device according to claim 1, wherein a first oil passage for supplying and discharging hydraulic oil to and from the first hydraulic chamber is provided in a wall portion of a cylinder case of the elevating cylinder. The elevating cylinder further includes an adjustment rod that protrudes downward from the base and is capable of adjusting an installation state of the base relative to an installation surface,
The upper portion of the adjustment rod is hermetically disposed in the second hydraulic chamber of the cylinder case, and a second oil passage is provided in the wall of the cylinder case for supplying and discharging hydraulic oil to and from the second hydraulic chamber. The steel pipe press-fitting / drawing device according to claim 2.

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