Hang Da Ji

Abstract

To provide a pile driver comprising a vibration preventing member capable of both improving a vertical property of a steel pipe pile and making a construction efficient.SOLUTION: A vibration preventing member 22: comprises a pair of rotation arms 31 and 32 having arm arcuate recesses 33 and 34 capable of being in contact with an outer peripheral face of a steel pipe pile 21; is formed so as to rotate between a closed state where rotation ends of the pair of rotation arms get close to each other and an open state where the rotation ends are separated from each other to be positioned inside a revolving circle C around a pair of arm rotation shafts 29 and 30 provided below a leader 15; and closes an opening provided between the arm arcuate recesses at a rotation base side with a spacer member 38 in the closed state. The spacer member: has a spacer arcuate recess 39 capable of being in contact with the outer peripheral face of the steel pipe pile; and is formed to rotate around a spacer rotation shaft comprising a pin-connection portion 43 provided below the leader so as to move one side end 39a in a circumference direction of the spacer arcuate recess 39 between an inside position and an outside position of the revolving circle C.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a pile driver, and more particularly to a pile driver equipped with an anti-vibration member that supports a steel pipe pile attached to a rotary drive device so that the pile can rotate and move axially. [Background technology]

[0002] In pile drivers that bury steel pipe piles or excavate with casings, anti-vibration members are provided to prevent the steel pipe piles and casings from tilting or becoming misaligned during construction. The anti-vibration member has an opening at the base side with a portion of the circumference cut out when a pair of rotating arms that hold the pile is closed, so that the opening and closing operations and the rotation operation of the upper rotating body required for extending the pile can be performed smoothly (see, for example, Patent Document 1). In such anti-vibration members, the distance between the rotation axes of the rotating arms becomes wider as the pile diameter increases, and the opening created tends to become larger, so anti-vibration members in which the opening is blocked by a removable spacer member have been developed and are in use (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-218538 A [Patent Document 2] JP 2019-157499 A Summary of the Invention [Problem to be solved by the invention]

[0004] Due to its structure, the anti-vibration member described in Patent Document 2 requires the work of attaching and detaching the spacer member before and after opening and closing. However, the heavy spacer member is not easy to handle, and if it comes into contact with the steel pipe pile, careful operation is required to retreat the pile driver, so there are problems in that the work is time-consuming and quick attachment and detachment is difficult.

[0005] Therefore, an object of the present invention is to provide a pile driver equipped with an anti-vibration member that can improve the verticality of steel pipe piles while also improving construction efficiency. [Means for solving the problem]

[0006] In order to achieve the above object, the pile driver of the present invention comprises a base machine having an upper rotating body rotatably mounted on the upper part of a lower running body, a leader erected at the front part of the upper rotating body, a rotary drive device capable of ascending and descending along the front surface of the leader, and an anti-vibration member for holding a steel pipe pile which is rotated and driven, and in the pile driver having a rotation circle set with the distance between the outer circumferential surface of the steel pipe pile and the rotation center of the upper rotating body as the allowable rotation radius, the anti-vibration member comprises a pair of rotating arms having arm arc-shaped recesses capable of contacting the outer circumferential surface of the steel pipe pile, and rotates about a pair of arm rotation axes provided at the lower part of the leader. The pair of pivot arms are formed to be rotatable between a closed state in which the pivot ends are close to each other, and an open state in which they are separated and positioned inside the rotation circle, and in the closed state, an opening provided between the arm arc-shaped recesses on the pivot base side is blocked by a spacer member, and the spacer member has a spacer arc-shaped recess that can abut against the outer peripheral surface of the steel pipe pile, and is formed to be capable of moving one circumferential end of the spacer arc-shaped recess between an inner position and an outer position of the rotation circle by rotating around a spacer pivot axis provided at the bottom of the leader.

[0007] The spacer member has two pin coupling parts provided symmetrically across a perpendicular bisector of a line segment connecting the axial centers of the pair of arm rotation shafts, and the spacer rotation shaft is characterized in that one of the two pin coupling parts is released and the other pin coupling part is maintained.The spacer member has one pin coupling part provided on the perpendicular bisector of a line segment connecting the axial centers of the pair of arm rotation shafts, and the spacer rotation shaft is characterized in that it is composed of the pin coupling part.In addition, the anti-vibration member is characterized in that it has a holding means for holding one circumferential end of the spacer arc-shaped recess at an inner position of the turning circle. Effect of the Invention

[0008] According to the present invention, the spacer member for closing the opening of the anti-vibration member provided in the pile driver rotates around the spacer rotation axis, moving one circumferential end of the spacer arc-shaped recess to the inside position and the outside position of the rotation circle, so that if the anti-vibration member is rotated in the open state, the steel pipe pile can be given the effect of pushing aside the spacer member. As a result, when extending the steel pipe pile, the rotation can be performed without the need to remove and attach the spacer member, which contributes to work efficiency. [Brief description of the drawings]

[0009] [Figure 1] 1 is a side view of a pile driver showing a first embodiment of the present invention. [Diagram 2] FIG. [Diagram 3] FIG. 3 is a cross-sectional view taken along line III-III of FIG. [Figure 4] FIG. 11 is a plan view of the main part showing a state in which the spacer member is rotated. [Diagram 5] FIG. 11 is a plan view of a main portion of a pile driver showing a second embodiment of the present invention in a state in which a spacer member is rotated. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] 1 to 4 are diagrams showing a pile driver according to a first embodiment of the present invention. As shown in Fig. 1, the pile driver 11 includes a base machine 14 consisting of a lower traveling body 12 equipped with crawlers and an upper rotating body 13 rotatably mounted on the lower traveling body 12, a leader 15 mounted on the front of the upper rotating body 13 so as to be able to rise and fall, and a hoisting cylinder 16 supporting the leader 15 from the rear. A leader support 17 supporting the leader 15 so as to be able to rise and fall is provided on the front of the upper rotating body 13, and a driver's cab 18 is provided on the right side of the upper rotating body 13, and an equipment room 19 housing an engine and a hydraulic unit is provided on the left side.

[0011] The leader 15 is made up of multiple leader members connected together, each with a cross section formed into a square tube, and is rotatably attached to a support shaft in the vehicle width direction provided on the leader support 17. A top sheave 20 around which a lifting rope is wound is provided at the upper end of the leader 15, and an openable and closable anti-vibration member 22 for preventing the steel pipe pile 21 from swinging is provided at the front of the lower part. A rack gear 23 is provided at the center of the front surface of the leader 15 as a component of the rack and pinion type lifting device, and a pair of left and right guide pipes 24, 24 are provided continuously over the entire length of the leader 15 at the front ends of both sides.

[0012] The auger 25, which is an example of a rotary drive device, has a pair of left and right guide gibs 25a, 25a that protrude rearward and are in sliding contact with the guide pipes 24, 24, and moves up and down along the front surface of the leader 15 by rotating a pair of left and right pinions (not shown) that mesh with the rack gear 23 using an auger lifting hydraulic motor 25b.

[0013] When performing steel pipe burying work, the prepared steel pipe pile 21 is hoisted up by a rope hanging down from the top sheave 20, and then its upper end is connected to a drive rod (rotary drive shaft) 26 via an adapter 27, and its lower end is embraced by an anti-vibration member 22. The attached steel pipe pile 21 is rotated by an auger drive hydraulic motor 25c, and is pressed into the ground by lowering the auger 25.

[0014] When the steel pipe pile 21 is to be extended, the buried steel pipe pile 21 and the adapter 27 are separated, the anti-vibration member 22 is opened, and the upper rotating body 13 is rotated in place. At this time, as shown in Figs. 1 and 2, a rotation circle C is set in the pile driver 11 with the distance between the outer circumferential surface of the steel pipe pile 21 and the rotation center (rotation axis PV) of the upper rotating body 13 as the rotation allowable radius R. As a result, when the anti-vibration member 22 is opened and retracted to the inside position of the rotation circle C, a rotation operation can be performed without interfering with the buried steel pipe pile 21. The prepared steel pipe pile 21 to be extended has its upper end connected to the adapter 27 in the side area of ​​the base machine 14, and is carried to the construction position (pile core) by a rotation operation in the opposite direction.

[0015] As shown in Figures 2 to 4, the anti-vibration member 22 is attached to the lower end of the leader 15 via a mounting bracket 28 that is height-adjustable, and a first arm rotation shaft 29 and a second arm rotation shaft 30 that are pin-connected are provided at both corners formed by the front plate 28a of the mounting bracket 28 and a pair of widthwise side plates 28b, 28b, and a first rotating arm 31 is rotatably attached to the first arm rotation shaft 29, and a second rotating arm 32 is rotatably attached to the second arm rotation shaft 30.

[0016] Each of the pivot arms 31, 32 has a substantially bilaterally symmetrical shape and is flat with two arm-shaped plates facing each other at a fixed interval, and is equipped with a first pivot base 31a and a second pivot base 32a which are rotatably connected to the first arm pivot shaft 29 and the second arm pivot shaft 30, respectively, a first pile holding portion 31b and a second pile holding portion 32b which are formed at the tip side of the pivot bases 31a, 32a and have a first arm arc-shaped recess 33 and a second arm arc-shaped recess 34 on the inside, respectively, which embrace the outer peripheral surface of the steel pipe pile 21, and a first connecting portion 31c and a second connecting portion 32c which are provided at the tip of each pile holding portion 31b, 32b, i.e., at the pivot end of each pivot arm 31, 32, which overlap each other and through which a connecting pin 35 is inserted. Each pile holding portion 31b, 32b is provided with a bolt fastening structure for attaching and detaching the collar member, and by changing it to one with arm arc-shaped recesses 33, 34 of different diameters, it is possible to accommodate a variety of pile diameters.

[0017] Each of the rotating arms 31, 32 can rotate about the first arm rotating shaft 29 and the second arm rotating shaft 30 between a closed state (FIG. 2) in which the rotating ends are close to each other and pin-connected, and an open state (FIG. 4 shows one side state) in which the pin connection is released and the rotating ends are separated from each other and located inside the rotation circle C. During the opening operation, an attached fixing pin 36 is inserted and removed, so that the fixing pin 36 engages with an insertion hole provided in the overlapping portion with the mounting bracket 28, and each of the rotating arms 31, 32 is held in the open state.

[0018] In such an open state, the first arm arc-shaped recess 33 and the second arm arc-shaped recess 34 are held at the inside position of the rotation circle C on both sides of the mounting bracket 28, and even if the upper rotating body 13 is rotated in place, they will not come into contact with the outer circumferential surface of the buried steel pipe pile 21. On the other hand, in the closed state, the ends 33a, 34a on the rotation end side of each arm arc-shaped recess 33, 34 are butted against each other, but the other ends 33b, 34b on the rotation base side are separated from each other and an opening 37 is provided therebetween. As a result, when the anti-vibration member 22 is opened and closed, the rotation base side of the arm arc-shaped recess 33, 34 does not come into contact with the steel pipe pile 21. This opening 37 is blocked by a spacer member 38 interposed and disposed between the first rotation base 31a and the second rotation base 32a.

[0019] The spacer member 38 has a bracket structure formed by assembling steel materials, and as shown in Figure 3, mainly comprises a spacer arc-shaped recess 39 that can abut against the outer peripheral surface of the steel pipe pile 21, an upper plate 40 and a lower plate 41 arranged facing each other above and below on the upper and lower outer surfaces of the spacer arc-shaped recess 39, and two pin connecting portions 42, 43 that are arranged symmetrically on either side of the perpendicular bisector Q of the line segment P connecting the axes of the pair of arm pivot shafts 29, 30 (Figure 2).

[0020] Each of the pin coupling parts 42, 43 has a pivot pin 44 with a handle 44a, a cylindrical body 45 fixed to the front surface of the front plate 28a of the mounting bracket 28, and pin holes 40a, 41a provided in the upper and lower plates 40, 41. The cylindrical body 45 has a length corresponding to the height dimension of the front plate 28a and an inner diameter corresponding to the diameter of the pivot pin 44. The pivot pin 44 can be inserted and removed in the vertical direction with the cylindrical body 45 and the upper and lower pin holes 40a, 41a overlapping coaxially.

[0021] The spacer member 38 assembled by the pin connection of two shafts, for example, rotates about the spacer rotation axis of the other side by using the pin connection part 43 on one side, which is maintained by releasing the pin connection state of the pin connection part 42 on the other side, as the spacer rotation axis, and moves the circumferential one side end part 39a of the spacer arc-shaped recess 39 (the part corresponding to the one side where the pin connection state is released) to the inside position (FIG. 4) and outside position (FIG. 2) of the turning circle C. In other words, the spacer member 38 is fixed by the pin connection of two shafts, but is configured to be rotatable in accordance with the turning operation when the pin on one side is removed before the turning operation.

[0022] The anti-vibration member 22 is provided with a holding means for holding the spacer member 38 at the inner position of the turning circle C. The spacer member 38 is held by the magnetic force of a magnet 46, for example, as shown in FIG. 3. The magnet 46 is provided on the rear surface of the lower end of the front plate 28a of the mounting bracket 28, and when the spacer member 38 rotates to the inner position (right side in FIG. 3), in other words, when the lower plate 41 of the spacer member 38 approaches the opposing surface (lower surface) of the magnet 46, the upper surface of the lower plate 41 is pulled by the magnetic force of the magnet 46 and is held in that position. On the other hand, if the rotational force acting on the spacer member 38 toward the outer position (left side in FIG. 3) exceeds the magnetic force, the lower plate 41 and the magnet 46 will move away from each other.

[0023] When the pile driver 11 thus constructed is used to install the steel pipe pile 21, the upper end of the steel pipe pile 21 is connected to the adapter 27, and then, as shown in Fig. 2, the anti-vibration member 22 is closed, and the rotating ends of the two rotating arms 31, 32 are pin-connected to each other, so that the lower part of the steel pipe pile 21 is embraced by the three arc-shaped recesses of the two arms 33, 34 and the spacer arc-shaped recess 39. In this closed state, the steel pipe pile 21 is buried in the ground by the rotation and lowering motion of the auger 25. The outer circumferential surface of the rotating steel pipe pile 21 comes into contact with the arc-shaped recesses 33, 34, 39, thereby suppressing the occurrence of vibration.

[0024] When the steel pipe pile 21 is to be extended, the buried steel pipe pile 21 is separated from the adapter 27. Here, for example, when the upper rotating body 13 is rotated left, it is sufficient that the anti-vibration member 22 has only the first rotating arm 31 in the counter-rotation direction in the open state as shown in Fig. 4. Then, in the spacer member 38, the pin coupling state of the pin coupling part 42 on the one side (counter-rotation direction) corresponding to the open state is released.

[0025] When the left turning operation is started after such preparation work, the spacer arc-shaped recess 39 is pushed by the outer circumferential surface of the steel pipe pile 21, causing the spacer member 38 to turn, and the one circumferential end 39a in the counter-turning direction moves from the outer position to the inner position of the turning circle C. Meanwhile, the other circumferential end 39b in the turning direction tries to move in a direction pushing the outer circumferential surface of the steel pipe pile 21, and at the same time, the steel pipe pile 21 also moves relatively in the counter-turning direction, and the two move apart without interfering with each other. In this way, the spacer member 38 turns a predetermined angle around the axis of the pin joint 43 in accordance with the left turning operation, and is then held in an inner position by the magnetic force of the magnet 46.

[0026] When the extension steel pipe pile 21 is brought to the construction position, a rotation operation in the opposite direction (right rotation) is performed, and the existing steel pipe pile 21 comes into contact with the other circumferential end 39b of the spacer arc-shaped recess 39 just before the construction position. Then, when the spacer arc-shaped recess 39 is pressed by the outer circumferential surface of the steel pipe pile 21, the lower plate 41 and the magnet 46 are separated by the rotation force of the spacer member 38, and the one circumferential end 39a moves from the inside to the outside of the turning circle C. In this way, the steel pipe pile 21 brought to the construction position is connected to the existing steel pipe pile 21, and then rotated and buried in the ground.

[0027] Thus, according to the first configuration of the present invention, the spacer member 38 for closing the opening 37 of the anti-vibration member 22 provided in the pile driver 11 rotates about the spacer rotation axis, thereby moving one circumferential end 39a of the spacer arc-shaped recess 39 to the inner and outer positions of the turning circle C, so that if the anti-vibration member 22 is turned in the open state, the steel pipe pile 21 can be given the action of pushing aside the spacer member 38. As a result, when the steel pipe pile 21 is extended, the turning operation can be performed without the need to remove and attach the spacer member 38, which contributes to work efficiency.

[0028] In addition, since the spacer rotation axis is made up of the pin coupling part on one side of the two pin coupling parts 42, 43, which is maintained by releasing the pin coupling state on the other side, the fixed state and the released state of the spacer member 38 can be set by a simple action of simply inserting and removing the pivot pin 44. Furthermore, since the anti-vibration member 22 is provided with a holding means for holding the one circumferential end part 39a of the spacer arc-shaped recess 39 at an inner position, it is possible to prevent the spacer member 38 from accidentally rotating after it has retreated to avoid the existing steel pipe pile 21 until it returns to the construction position. In particular, since the holding means is a means for holding by magnetic force using the magnet 46, it can be constructed at low cost.

[0029] 5 shows a second embodiment of the pile driver of the present invention. In the following description, the same components as those of the pile driver 11 shown in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

[0030] The anti-vibration member 51 of the pile driver 11 shown in the second embodiment includes a spacer member 53 attached to a mounting bracket 52 by a single-shaft pin connection. The spacer member 53 mainly includes a spacer arc-shaped recess 54 that can come into contact with the outer circumferential surface of the steel pipe pile 21, an upper plate 55 and a lower plate (not shown) that are arranged facing each other up and down on the upper and lower outer surfaces of the spacer arc-shaped recess 54, and one pin connection portion 56 provided on a perpendicular bisector Q of a line segment P that connects the axes of a pair of arm rotation shafts 29, 30.

[0031] The pin joint 56 has a connecting pin structure consisting of a pin and a boss. The spacer member 53 rotates around the pin joint 56 as a spacer rotation axis, and moves one of the circumferential side ends 54a, 54a of the spacer arc-shaped recess 54 to an inner position or an outer position of the turning circle C according to the turning direction. The connecting pin structure is set to have a strong fit, and serves as a holding means for holding the spacer member 53 at the inner position. That is, the spacer member 53 is held in that position until the rotational force applied during the turning operation exceeds the frictional force of the fit.

[0032] In the second configuration, as in the first configuration, the rotation can be performed without the need to attach and detach the spacer member 53, which contributes to work efficiency. In particular, since the pin coupling part 56 is provided at a position that divides the distance between the arm rotation shafts 29, 30 equally (the center position), the arm can be moved away from the existing steel pipe piles 21 in the attached state in either the left or right rotation direction. In addition, since the holding means is a means that holds the arm by frictional force using a connecting pin structure, the structure can be constructed at low cost.

[0033] The present invention is not limited to the above-mentioned embodiments, and the shape of the spacer member and the arrangement of the spacer rotation axis can be appropriately changed according to the specifications of the vibration-proof member. Also, the buried material may be a casing instead of a steel pipe pile. Furthermore, when configured with a single-shaft pin connection, the rattle of the spacer member can be suppressed simply by forming three arc-shaped recesses continuously without gaps, so that the simple configuration is suitable for use in a closed state. In addition, in each embodiment, the holding means is configured by a magnet in the two-shaft pin connection and by strengthening the fit between the pin and the boss in the single-shaft pin connection, but for example, a magnet may be used for the single-shaft pin connection. [Explanation of symbols]

[0034] 11...pile driver, 12...lower running body, 13...upper rotating body, 14...base machine, 15...leader, 16...derailing cylinder, 17...leader support, 18...operator's cab, 19...equipment room, 20...top sheave, 21...steel pipe pile, 22...anti-vibration member, 23...rack gear, 24...guide pipe, 25...auger, 25a...guide gib, 25b...hydraulic motor for lifting and lowering auger, 25c...hydraulic motor for driving auger, 26...drive rod, 27...adapter, 28...mounting bracket, 28a... Front plate, 28b...side plate, 29...first arm pivot shaft, 30...second arm pivot shaft, 31...first pivot arm, 31a...first pivot base, 31b...first pile holding portion, 31c...first connecting portion, 32...second pivot arm, 32a...second pivot base, 32b...second pile holding portion, 32c...second connecting portion, 33...first arm arc-shaped recess, 33a...one end, 33b...other end, 33c...inner arc-shaped circumferential surface, 34...second arm arc-shaped recess, 34a...one end, 34b...other end, 34c...inner arc-shaped circumferential surface, 35...connecting pin , 36...fixing pin, 37...opening, 38...spacer member, 39...spacer arc-shaped recess, 39a...one circumferential end, 39b...other circumferential end, 40...upper plate, 40a...pin hole, 41...lower plate, 41a...pin hole, 42, 43...pin connection portion, 44...rotating pin, 44a...handle, 45...tubular body, 46...magnet, 51...anti-vibration member, 52...mounting bracket, 53...spacer member, 54...spacer arc-shaped recess, 54a...both circumferential end portions, 55...upper plate, 56...pin connection portion

Claims

1. A pile driver including a base machine having an upper rotating body rotatably mounted on an upper part of a lower running body, a leader erected at the front of the upper rotating body, a rotary drive device capable of ascending and descending along the front surface of the leader, and a vibration-proof member for holding a steel pipe pile that is rotated, and a turning circle is set with the distance between the outer circumferential surface of the steel pipe pile and the turning center of the upper rotating body as the turning allowable radius, The anti-vibration member includes a pair of pivot arms having arm arc-shaped recesses capable of contacting the outer peripheral surface of the steel pipe pile, and is formed to be rotatable about a pair of arm pivot axes provided at the lower part of the leader between a closed state in which the pivot ends of the pair of pivot arms are close to each other and an open state in which the pivot ends are separated and positioned inside the rotation circle, and in the closed state, an opening provided between the arm arc-shaped recesses on the pivot base side is blocked by a spacer member, The pile driver is characterized in that the spacer member has a spacer arc-shaped recess that can abut against the outer peripheral surface of the steel pipe pile, and is configured to be able to move one circumferential end of the spacer arc-shaped recess between an inner position and an outer position of the rotation circle by rotating around a spacer rotation axis provided at the bottom of the leader.

2. the spacer member has two pin coupling portions provided symmetrically with respect to a perpendicular bisector of a line segment connecting the axial centers of the pair of arm rotation shafts, 2. The pile driver according to claim 1, wherein the spacer rotation shaft is formed of one of the two pin connecting portions, the other of which is maintained when the pin connecting state of the other of the two pin connecting portions is released.

3. the spacer member has one pin coupling portion provided on a perpendicular bisector of a line segment connecting the axial centers of the pair of arm rotation shafts, 2. The pile driver according to claim 1, wherein the spacer rotation shaft comprises the pin connection portion.

4. 4. The pile driver according to claim 1, wherein the anti-vibration member is provided with a retaining means for retaining one circumferential end of the spacer arc-shaped recess at an inner position of the turning circle.

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