JP4465287B2 - Pile driver - Google Patents

Description

  The present invention relates to a pile driving machine including a steadying device that slidably supports a rod having a drill bit or the like provided at the tip thereof, and in particular, the steadying device is attached to a leader so as to be movable up and down. The present invention relates to a pile driving machine capable of positioning at an arbitrary height.

  A pile driver equipped with a working device that moves up and down along a leader is used for foundation work at a construction site. FIG. 7 is a side view showing a conventional pile driver disclosed in Patent Document 1 below. In this pile driving machine 100, a leader 101 is provided at the front end so that it can be raised and lowered by a backstay cylinder 102, and an auger drive 110 is mounted on the standing leader 101 so as to be able to move up and down. The rod 120 is connected. The auger drive 110 slidably holds the guide pipe 103 of the reader 101 with a guide give 111.

  Therefore, the auger drive 110 descends along the leader 101 while rotating the excavating rod 120, so that the ground is excavated by the excavating blade 121 provided at the tip of the excavating rod 120, and the stirring blades 122, 123 thereon The ground excavated by is broken more finely. On the other hand, in such construction using the excavation rod 120, in order to prevent excavation of the excavation rod 120 at the time of rotational driving and enable straight excavation, a steadying device 130 for passing the rod 103 is provided on the lower end side of the leader 101. It has been.

  By the way, in the pile driving machine 100 shown in FIG. 7, the steadying device 130 is fixed to the leader 101. Therefore, the auger drive 110 cannot be lowered below the steady rest device 130, and therefore the leader 101 is also formed with that length. Originally, if the auger drive 110 can be further lowered by extending the leader 101 downward, the work area for one stroke is expanded and the work efficiency is improved, and the excavation rod 120 is taken by taking the distance from the steady rest device 130. The straightness of the will also improve. However, in this pile driving machine 100, as can be seen from the figure, the excavating blade 121 of the excavating rod 120 and the like will interfere with the anti-rest device 130 in the state before starting excavation. The position of 130 cannot be lowered.

Therefore, at the stage before starting the work shown in FIG. 7, the steady rest device 130 is raised to avoid interference with the excavating blade 121 and the excavation progresses, and the stirring blades 122 and 123 enter the ground. It can be considered that the steady rest device 130 can be lowered. The following Patent Document 2 discloses a steady-state up-and-down apparatus that can do so. As in the auger drive 110, the steady rest device is configured to slide and hold the guide pipe 103 of the reader 101 with a guide give. However, since it is suspended from the auger drive by a chain, it moves up and down in synchronization with the auger drive. In this regard, the wire rope from the winch is sent out through the top sheave at the upper end of the leader, and the wire rope can be lifted and lowered independently by connecting and hanging the steady rest device.
Japanese Patent Laid-Open No. 2002-220832 (second page, FIG. 7) JP 2002-242181 (second page, FIG. 9)

However, the pile driving machine in which the steady rest device is hung on the wire rope so as to be movable up and down has the following problems because the steady rest device is only in the position suspended by its own weight.
For example, when an obstacle is applied to the excavating blade 121 during excavation and an external force is applied to the excavating rod 120 and the excavating rod 120 is slightly tilted and twisted with the anti-rest device, the anti-vibration rod 120 is lowered. I will be moved. Then, the wire rope that suspends the steady rest device may be forcibly pulled and may be cut. On the contrary, when the excavation rod is pulled up, if the anti-rest device is similarly moved to the excavation rod, the anti-rest device is lifted together with the wire rope loosened. In this case, since there is nothing to support in the raised position, there is a risk that the steady rest will suddenly fall if there is no catching with the rod.

  Then, this invention aims at providing the pile driver which can position the steadying apparatus which can be raised / lowered along a leader with arbitrary height in order to solve this subject.

  The pile driver according to the present invention is a swing that supports a rod slidably so that a rod rotated by a working device that moves up and down along a leader can move straightly and perform operations such as excavation without lateral shaking. A stopper device, which is mounted so as to be movable up and down with respect to the leader, suspended by a wire rope, and raised and lowered by winding with a winch, and a rack is formed in the leader The steadying device includes a positioning unit that meshes with the rack and an operating unit that operates the positioning unit, and the operating unit makes the positioning unit immovable with respect to the rack at a predetermined height. It is characterized by the above.

Further, in the pile driving machine of the present invention, the rack formed on the leader has teeth formed on one or both of the left and right, and operates the positioning means that meshes with one or both teeth, and the positioning means. It is preferable that the operation means is provided.
Further, in the pile driving machine of the present invention, the positioning means is a pinion that meshes with the rack and rolls, and the operation means attaches the pinion to an output shaft and operates the disc brake by hydraulic pressure. A pinion unit that switches between rotation and non-rotation of the output shaft is preferable.

Further, in the pile driving machine of the present invention, the positioning means is a short rack piece that meshes with the rack, and the operation means is a cylinder that makes the rack piece contact and separate from the rack. It is preferable.
Further, in the pile driving machine of the present invention, the steadying device has a positioning part provided with the positioning means and the operating means, and a steadying part for performing the steadying of the rod, and the positioning part On the other hand, it is preferable that the steady rest is detachable.

Therefore, in the pile driving machine of the present invention, the positioning means such as the pinion is fixed to the rack formed on the leader by stopping the rotation of the meshed pinion or meshing the rack piece. The steady rest device can be positioned at an arbitrary height by operating the operation means. Therefore, for example, it is possible to prevent co-up and co-fall with the excavation rod that is the object of steadying, and it is possible to work safely.
Moreover, in the present invention, since the steady rest is detachable from the positioning part, various steady rests corresponding to the work can be exchanged.

  Next, an embodiment of a pile driving machine according to the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing the pile driving machine of the present embodiment. The pile driving machine 1 is configured as a base machine provided with a revolving body 3 capable of turning on a traveling unit 2 provided with a crawler. In the revolving structure 3, a driver's cab 6 and a power unit 7 including a hydraulic pump and the like are arranged on the left and right on a main frame 5, and a leader support frame 8 is provided at the front of the main frame 5, and a reader 10 is provided there. Is supported. The leader 10 is supported by a backstay cylinder 9 from the rear, and is configured to stand up and lie down by rotating in the longitudinal direction of the body as the backstay cylinder 9 expands and contracts.

  As shown in the figure, an auger drive 110 is mounted on the standing reader 10 so as to be movable up and down. That is, the leader 10 is provided with guide pipes 11 on the left and right side surfaces of the airframe over almost the entire length, and the auger drive 110 is provided with guide gibs 111 that grip and slide the guide pipes 11 from the left and right. And the excavation rod 120 is connected with the rotating shaft of the auger drive 110. The excavation rod 120 excavates the ground with the excavation blade 121 provided at the tip, and the agitation blades 122 and 123 on the excavation rod 120 further remove the ground. It is configured to be crushed finely.

  In such construction using the excavation rod 120, it is necessary to prevent excavation of the excavation rod 120 during rotational driving so that the excavation can be performed straight. Therefore, the pile driving machine 1 of the present embodiment is also provided with a steadying device 20 that passes the excavation rod 120 on the lower end side of the leader 10. In particular, the pile driving machine 1 of the present embodiment is a steadying device that can be moved up and down along the leader 10, and is configured so that it can be positioned at an arbitrary height. That is, the position can be determined with respect to the reader 10 at an arbitrary height adjusted according to the work situation. Here, FIG.2 and FIG.3 is the top view and side view which showed the steadying apparatus of the pile driving machine which concerns on 1st Embodiment.

  The steadying device 20 includes a steadying unit 20 a formed so as to grip the excavation rod 120 and a positioning unit 20 b that can be moved up and down along the reader 10. First, the steadying portion 20a of the steadying device 20 has a pair of opening and closing guides 21 and 22 for holding the excavation rod 120 lightly and slidably. The open / close guides 21 and 22 are pivotally supported by shafts 25 and 25 with respect to the bracket 23 fixed to the box 31 of the positioning portion 20b so as to swing on a horizontal plane orthogonal to the vertically standing reader 10. It is configured. The brace portion 20a is configured such that the bracket 23 can be attached to and detached from the box 31 by bolts, and various brace portions having different opening / closing guide sizes and shapes can be exchanged for the positioning portion 20b.

As shown in FIG. 2, the lock pins 24 are inserted into the overlapping ends of the open / close guides 21 and 22 in the closed state. Thus, the open / close guides 21 and 22 are locked to hold the excavation rod 120 and the like. Further, when the lock pin 24 is pulled out, the open / close guides 21 and 22 are released, and the shafts 25 and 25 attached to the bracket 23 can be pivoted and opened on the fulcrum.
The inner sides of the open / close guides 21 and 22 are each formed in a semicircular curve, and exchangeable semi-cylindrical iron collars 26 and 26 are removably attached thereto. Then, as shown in the figure, the iron collars 26 and 26 are arranged in a cylindrical shape with the open / close guides 21 and 22 closed, and the excavation rod 120 inside the iron collars 26 and 26 is lightened (so that there is a slight gap). To be able to hold).

  Next, the steady rest 20 having the steady rest 20a is moved up and down with respect to the reader 10 integrally with the positioning part 20b, and can be positioned at an arbitrary height. And the rack 12 previously provided in the reader | leader 10 is used for the positioning by the positioning part 20b. First, the leader 10 of the pile driving machine 1 is a square steel pipe, and the guide pipe 11 is fixed to the left and right side surfaces of the machine body as described above. This is to enable a working device such as an auger drive 110 to be able to move up and down along the leader 10, and guide gigs 32 and 32 for slidably holding the guide pipe 11 are also provided in the positioning unit 2 in the box 31. Is formed.

  Further, a rack 12 is fixed to the leader 10 at the center on the front side of the machine body over almost the entire length. The rack 12 is configured such that, for example, a working device having a driving device meshes with a pinion, and the pinion can be moved up and down along the leader 10 by the rotation of the pinion. In the present embodiment, the steadying device 20 is positioned using the reader 10 with the rack 12. That is, a pinion unit 35 is provided in the box 31 of the positioning portion 20b. The pinion unit 35 rotates and supports the pinion 33 that rotates in mesh with the rack 12, and further restricts the rotation. The rack 12 is formed with teeth on the left and right sides, and the positioning portion 20b is provided with a pair of pinion units 35 and 35 that engage with the pinions 33 and 33 from the left and right.

  The pinion unit 35 is fixed in the box 31, and a pinion 33 is attached to the output shaft 41. Here, FIG. 4 is a cross-sectional view showing the pinion unit 35. The pinion unit 35 includes a planetary speed reduction mechanism including a disc brake. An output shaft 41 supported by a bearing protrudes from the body 42 of the pinion unit 35, and a rotating shaft 43 is coaxially provided inside. And between the output shaft 41 and the rotating shaft 43, the planetary reduction mechanism 45 is comprised from the sun gear by the side of the rotating shaft 43, and the planetary gear by the side of the output shaft 41.

  Further, a brake disc 46 is fixed to the rotary shaft 43 in the pinion unit 35, and a rotation stop plate 47 is provided for the brake disc 46. The rotation stop plate 47 is movable in the axial direction but attached in a non-rotation state, and is urged by a spring 48 installed on the opposite side of the disc brake 36 side. Accordingly, the rotation stop plate 47 is pressed against the brake disk 46 by the spring 48 to restrict the rotation of the rotation shaft 43 and the output shaft 41, that is, the rotation of the pinion 33 attached to the output shaft 41. Further, a pressure chamber 49 is formed in the body 42 by a pressure receiving portion 47a formed by projecting from the annular plate portion of the rotation stop plate 47, and a hydraulic port 44 communicates therewith.

  Therefore, in the pile driving machine 1 according to the present embodiment, the auger drive 110 attached to the standing leader 10 rises along the leader 10 and is disposed at the upper end as shown in FIG. The excavation rod 120 is attached to such an auger drive 110 so as to be suspended. At that time, in the steady rest device 20, the lock pin 24 is removed, and the open / close guides 21 and 22 that have become free are spread left and right. In such a state, the excavation rod 120 is attached to the auger drive 110, and then the open / close guides 21 and 22 are closed so as to sandwich the suspended excavation rod 120, and the lock pin 24 is inserted into the overlapping tip portion. Locked.

  The steady rest device 20 is suspended in a state in which the guide gib 32 of the positioning portion 20b slidably holds the guide pipe 11 and the wire rope 13 fed forward from the top sheave 14 of the reader 10 is connected and can be raised and lowered. It has been. Therefore, the steady rest 20 before the start of excavation is positioned at a height raised from the lower end of the leader 10 so as not to interfere with the excavation blade 121 and the stirring blades 122 and 123 at the lower end of the excavation rod 120. To that end, the winch of the pile driving machine 1 is wound up, the wire rope 13 is pulled, and the steadying device 20 is raised.

  The steady rest 20 that moves up and down along the leader 20 rotates while rolling according to the rack 12 in which the guide gibs 32 and 32 slide on the guide pipe 11 and the pair of pinions 33 and 33 are engaged with each other. At this time, in the pinion unit 35, pressure oil is supplied from the hydraulic port 44, the pressure in the pressurizing chamber 49 is increased, and the pressure receiving portion 47a of the rotation stop plate 47 is pressurized. Therefore, the rotation stop plate 47 moves downward in FIG. 4 against the urging force of the spring 37 and is separated from the brake disk 46. Thereby, the rotation of the rotating shaft 43 becomes free, and the output shaft 41 connected via the planetary reduction mechanism 45 and the pinion 33 attached thereto rotate.

  Then, as shown in FIG. 1, the steadying device 20 pulled up to a predetermined height is positioned by a pinion unit 35. That is, the pressurized state in the pressurizing chamber 49 is released. Thereby, the rotation stop plate 47 is pressed against the brake disc 46 by the urging force of the spring 37 as shown in FIG. Therefore, the rotation of the rotation shaft 43 is stopped by the rotation stop plate 47, and the rotation of the output shaft 41 connected via the planetary speed reduction mechanism 45 and the pinion 25 attached thereto is limited. Accordingly, the steady rest device 20 suspended from the wire rope 13 is not only restricted from moving downward, but also restricted from moving upward due to the limited rotation of the pinion 25.

  When the work is started by driving the auger drive 110, the excavation rod 120 is rotated, and the excavation blade 121 at the lower end is excavated into the ground while excavating the ground. At this time, even if the excavation rod 120 is caught and the lowering occurs, the steadying device 20 is not lowered by the positioning unit 20b that restricts the rotation of the pinion 25, and the wire rope 13 is forcibly pulled. There is no worry of getting cut out. And if it digs to some extent and the stirrer blade 123 enters the ground, the interference with the steadying device 20 does not occur, and the steadying device 20 is lowered to the lower end of the reader 10. Also at this time, the pinion unit 35 of the positioning unit 20b operates the rotation and non-rotation of the pinion 25 to move down and perform positioning at that position.

  On the other hand, when the excavation rod 120 is pulled up, for example, a situation may occur in which the steadying device 20 is caught on the excavation rod 120 and rises together. However, since the steadying device 20 is restricted from rotating in the vertical direction because the rotation of the pinion 25 meshed with the rack 12 is restricted, the steadying device 20 is not lifted as the excavating rod 120 is pulled up. For this reason, there is no possibility of causing a dangerous situation in which the steady rest 20 lifted by lifting up is released and suddenly falls.

  Therefore, according to the steady rest device 20 of the present embodiment, since it can be positioned at an arbitrary height with respect to the reader 10, it is possible to prevent co-up and down with the excavation rod 120, and safely Now you can work. Further, since the steady rest 3 can be attached to and detached from the positioning part 20b, various steady rests corresponding to the work can be exchanged.

  Next, a second embodiment of the pile driving machine according to the present invention will be briefly described. FIG. 5 is a plan view showing the steady rest device of the present embodiment, and FIG. 6 is a view taken along arrow A in FIG. The same components as those in the first embodiment will be described with the same reference numerals. This steady rest device 50 is slidably attached to the reader 10 shown in FIG.

  Therefore, the steadying device 50 includes a steadying part 50 a formed so as to grip the excavation rod 120 and a positioning part 50 b that can be moved up and down along the reader 10. In the steadying portion 50 a, a pair of opening / closing guides 21 and 22 are pivotally supported on the bracket 23 by a shaft 25. For this reason, the lock pin 24 is inserted in the closed state as shown in the figure, and a slight gap is provided between the collars 26 and 26 to lightly hold the excavating rod 120 and to release the lock pin 24. The open / close guides 21 and 22 can be spread left and right. Since the bracket 23 can be attached to and detached from the box 31 with bolts, the steady rest 50a can be replaced with various steady rests with different sizes of the opening / closing guides with respect to the positioning part 50b.

  Next, in the positioning portion 50b, guide gibs 32 and 32 for slidably holding the guide pipe 11 of the reader 10 are formed in the box 31. A cylinder 62 with piston rods 62a projecting in both the left and right directions is fixed to the internal support plate 61, and thereby the positioning of the steady rest device 50 is operated. In the present embodiment, a triangular tooth rack 15 shown in FIG. 6 is fixed to the leader 10, and the same triangular tooth rack piece 63 is engaged with the rack 15. The rack piece 63 is slidably mounted in the left-right direction by a guide (not shown) formed on the support plate 61, and further passes through a notch 64 formed on the support plate 61, and is fixed to the piston rod 62a of the cylinder 62. The connected connecting rod 65 is fixed. Accordingly, the rack piece 63 can be moved in the left-right direction by expansion and contraction of the cylinder 62.

  Therefore, in the pile driving machine according to the present embodiment, the height of the steady rest device 50 rising from the lower end of the leader 10 so that the excavating blade 121 and the stirring blades 122 and 123 at the lower end of the excavating rod 120 do not interfere before starting excavation. (Refer to FIG. 1 as appropriate, the same applies hereinafter). To that end, the winch of the pile driver is wound up, the wire rope 13 is pulled, and the steady rest device 50 is raised. The steady rest device 50 slides in a state where the guide gibs 32 and 32 sandwich the guide pipe 11. At this time, the cylinder 62 is in an extended state, and as shown in FIG. 6, the rack piece 63 is moved away from the rack 15 and the steadying device 50 can be moved.

  Then, the steady rest device 50 pulled up to a predetermined height is positioned. That is, the cylinder 62 is contracted and the pair of rack pieces 63 and 63 are brought close to each other and meshed with the rack 15. Thereby, the movement of the steady rest device 50 suspended from the wire rope 13 in the vertical direction is restricted. At the time of construction, rotation is given from the auger drive 110 to the excavation rod 120 in a state where the steady rest device 50 is held, and the ground is excavated by the excavation blade 121 at the lower end and is excavated into the ground. At this time, even in a situation where the excavation rod 120 is caught and the co-falling occurs, there is no concern that the wire rope 13 is cut without the steady rest device 50 being lowered by the rack piece 63 engaged with the rack 15.

If the agitating blade 133 enters the ground after digging to some extent, the interference with the steadying device 50 does not occur, and the steadying device 50 is lowered to the lower end of the reader 10. At this time, the cylinder 62 extends and the pair of rack pieces 63, 63 move away from each other and away from the rack 15. Then, at the lower end of the leader 10, the rack piece 63 is again engaged with the rack 15, and positioning is performed.
On the other hand, when the excavating rod 120 is pulled up, the steady rest device 50 may be caught and lifted together. However, also in this embodiment, since the rack piece 63 is engaged with the rack 15 and the movement in the vertical direction is stopped, the rack piece 63 is lifted as the excavating rod 120 is pulled up, and then the steady rest device 50 is suddenly moved. It does not cause a dangerous situation such as falling.

  Therefore, since the steady rest device 50 of this embodiment can be positioned at an arbitrary height with respect to the reader 10, it can be prevented from being raised and lowered with the excavation rod 120, and can be safely operated. I can do it now. Further, since the steady rest 50a can be attached to and detached from the positioning part 50b, various steady rests can be exchanged according to the work.

As mentioned above, although one Embodiment of the steadying apparatus of the pile driving machine which concerns on this invention was described, this invention is not limited to this, A various change is possible in the range which does not deviate from the meaning.
For example, in addition to the structure of the steady rests 20a and 50a shown in the above embodiment, the drilling rod 120 can be provided with a hold function proposed by the present applicant and disclosed in Japanese Patent Laid-Open No. 2002-220732. The gripping may be performed without opening / closing the open / close guides 21 and 22. Further, the pinion unit may be provided only on one side as long as the brake force is sufficient.

It is the side view which showed one Embodiment of the pile driver. It is the top view which showed the steadying apparatus of the pile driving machine which concerns on 1st Embodiment. It is the side view which showed the steadying apparatus of the pile driving machine which concerns on 1st Embodiment. It is sectional drawing which showed the pinion unit. It is the top view which showed the steadying apparatus of the pile driving machine which concerns on 2nd Embodiment. It is the A arrow directional view of FIG. 5 which showed the positioning part of the steadying apparatus. It is the side view which showed the conventional pile driver.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pile driver 10 Leader 11 Guide pipe 12 Rack 13 Wire rope 20 Stabilizer 20a Stabilizer 20b Positioning part 21,22 Opening / closing guide 32 Guide giving 33 Pinion 35 Pinion unit 110 Auger drive 120 Excavation rod

Claims (5)

A rod that is rotated by a working device that moves up and down along the leader is equipped with a steady-state device that slidably supports the rod so that it can move straight without any lateral swing and can perform operations such as excavation. In the pile driving machine, the device is mounted so as to be movable up and down with respect to the leader, and is lifted and lowered by winding with a winch suspended by a wire rope.
A rack is formed in the leader, and the steadying device has positioning means that meshes with the rack, and operating means that operates the positioning means. The operating means racks the positioning means at a predetermined height. A pile driver characterized in that it is in an immobile state. In the pile driver according to claim 1,
The rack formed on the leader is provided with teeth on one or both of the left and right, the positioning means engaging with one or both teeth, and the operating means for operating the positioning means. A pile driver characterized by that. In the pile driver according to claim 1 or claim 2,
The positioning means is a pinion that meshes with the rack and rolls, and the operation means attaches the pinion to the output shaft and operates the disc brake by hydraulic pressure to switch between rotation and non-rotation of the output shaft. A pile driving machine characterized by being a pinion unit. In the pile driver according to claim 1 or claim 2,
The pile driving machine according to claim 1, wherein the positioning means is a short rack piece that meshes with the rack, and the operation means is a cylinder that abuts and separates the rack piece from the rack. In the pile driver according to any one of claims 1 to 4,
The steadying device includes a positioning unit including the positioning unit and an operation unit, and a steadying unit for performing the steadying of the rod, and the steadying unit is attachable to and detachable from the positioning unit. A pile driver characterized by being a thing.

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