Hangzhou Daji

Abstract

To provide a pile driver capable of holding even an auger with a large height at a transportation position integrally with a lower guide. [Solution] The leader 15, which is mounted on the front of the base machine 14 and can be raised and lowered, has a basic leader 26 that is pivotally supported on the front end of the leader support 17 so that it can rotate in the forward and backward directions, a lower leader 28 that is detachably connected to the lower end of the basic leader, and a flange connection portion 30 that is formed by bolting the flanges of the basic leader and lower leader together.In this pile driver 11, which can be changed from a working position in which the leader is upright vertically and a state in which the auger 35 and lower guide 32 are held integrally on the front of the lower leader, to a transport position in which the bolt connection of the flange connection portion is released and the basic leader is tilted backward, the flange connection portion 30 has an upward slope from the rear side to the front side.

Description

[Technical Field]

[0001] The present invention relates to a pile driver, and more particularly to a pile driver that can be transported without disassembly by placing the leader in a transport position with the leader laid down. [Background technology]

[0002] Conventionally, when transporting a small pile driver, the working equipment (e.g., auger) and lower guide are held integrally in front of the lower leader (transport position), and the upper leader is tilted backward independently of the lower leader to assume a transport position, thereby keeping the overall height low (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-141937 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, there has been an increasing need for sites where small pile drivers are used to increase the excavation capacity of the pile drivers by using relatively larger augers than before. However, augers with larger heights occupy more space in front of the lower leader when in transport position, forcing the cumbersome task of removing and reattaching the lower guide to the lower leader each time the vehicle is transported. Furthermore, when the lower guide is removed, a replacement part (e.g., a stopper) is required to prevent the auger from falling, resulting in an increase in the number of parts.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a pile driver that can hold even a tall auger in a transport position together with the lower guide. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the pile driver of the present invention comprises a leader that is at least capable of being raised and lowered via a leader support at the front of a base machine, a working device that is mounted so as to be able to rise and lower along the front surface of the leader, and a lower guide that is mounted on the lower front surface of the leader, wherein the leader has a basic leader that is pivotally supported in the front end of the leader support so as to be able to rotate in the forward and backward directions, a lower leader that is detachably connected to the lower end of the basic leader, and a flange connection portion formed by bolting the flanges of the basic leader and the lower leader together, and is a pile driver that can change its position between a working position in which the leader is upright vertically and a transport position in which the bolt connection of the flange connection portion is released and the basic leader is tilted backward from a state in which the working device and the lower guide are held integrally on the front surface of the lower leader, and is characterized in that the flange connection portion has an upward slope from the rear side to the front side.

[0007] The flange coupling portion is characterized by being provided with a notch for avoiding contact with the front end portion of the leader support. [Effects of the Invention]

[0008] According to the pile driver of the present invention, the flange joint between the basic leader and the lower leader has an upward inclination from the rear to the front, so that the front face of the lower leader can be extended upward without changing the overall height in the transport position from the conventional one, and even a tall auger can be held in the transport position together with the lower guide. Moreover, because the lower guide also serves as a support function for the auger, there is an advantage in that the number of parts can be reduced compared to when support is performed using alternative parts.

[0009] In addition, since the flange connection portion is provided with a notch to avoid contact with the front end of the leader support, the inclined flange connection portion can be provided on the leader in a natural manner, and since it does not affect the change in position between the working position and the transport position, it contributes to the safe and smooth operation of the pile driver. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a side view showing a pile driver according to an embodiment of the present invention in a working position with a leader raised; [Figure 2] FIG. 10 is a side view showing the same in a transport posture with the leader laid down. [Figure 3] FIG. 10 is a side view of the main part showing the working posture. [Figure 4] FIG. 10 is a plan view of the main part showing the working posture. [Figure 5] FIG. 4 is a view taken along arrows VV in FIG. 3. [Figure 6] 6 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. 10 is a side view of the main part showing the same in a transport posture. [Figure 8] FIG. 10 is a plan view of the main part showing the state of the transport posture. DETAILED DESCRIPTION OF THE INVENTION

[0011] 1 to 8 show one embodiment of a pile driver of the present invention. As shown in FIG. 1, the pile driver 11 includes a base machine 14 composed of a crawler-equipped lower track body 12 and an upper rotating body 13 rotatably mounted on the lower track body 12, a leader 15 erected at the front of the upper rotating body 13, and a leader derrick cylinder 16 supporting the leader 15 from the rear. A leader support 17 is provided at the front of the upper rotating body 13 to support the leader 15 so that it can be hoisted. A piping support member 18 for supporting hydraulic piping is provided above the front of the upper rotating body 13. A cab 19 is provided on the right side of the upper rotating body 13, and an equipment room 20 accommodating an engine and hydraulic unit is provided on the left side. Stabilizing jacks 21 are provided at four locations on the front, rear, left, and right sides of the upper rotating body 13, and a counterweight 22 is mounted at the rear end of the upper rotating body 13 to balance the pile driver 11.

[0012] The leader support 17 is journaled on a rotation shaft disposed in the front-to-rear direction on one side of the main frame of the upper rotating body 13 so as to be rotatable in the left-to-right direction, and a leader left-to-right tilt cylinder 46 is provided on the rotation end side of the leader support 17, which is opposite the rotation shaft. In addition, the base end of the leader hoisting cylinder 16 is rotatably connected to the rear end of the leader support 17 via a connection pin 47. As a result, by rotating (tilting) the leader support 17 and the leader 15 in the front-to-rear and left-to-right directions using the leader left-to-right tilt cylinder 46 and the leader hoisting cylinder 16, respectively, it is possible to center the leader 15 by raising it to a predetermined angle, for example, in the vertical direction.

[0013] The leader 15 is made up of multiple leader members each having a rectangular cylindrical cross section that are detachably connected to one another, and the cylinder rod of the leader elevation cylinder 16 is rotatably connected to a cylinder bracket 23 provided on the rear surface via a connection pin 24. The leader 15 is also formed by dividing it into a basic leader 26 that is rotatably attached to a support shaft (rotating pin) 25 in the base machine width direction that is provided on the leader support 17, an upper leader 27 that is connected to the top of the basic leader 26, and a lower leader 28 that is connected to the bottom of the basic leader 26, and further, the upper leader 27 is formed by dividing it into multiple upper leader members.

[0014] Each leader member has a flange joint formed by fastening adjacent flanges together with bolts and nuts. Of the multiple flange joints, the flange joints 29 used to connect the upper leader 27 are all perpendicular (i.e., horizontal) to the leader length direction (the vertical direction in Figure 1), and as shown in Figure 4, they have the same structure, with the same shape of the flange 29a (approximately rectangular ring-like), the same size and arrangement pitch of the bolt holes 29b, etc., and can be reassembled to different leader lengths by removing the bolts and nuts. On the other hand, the flange joints 30 used to connect the lower leader 28, as will be described in detail later, have an upward slope from the rear to the front (Figure 3).

[0015] In addition, a top sheave 31 around which the lifting rope is wound is located at the upper end of the upper leader 27, and a lower guide 32 that prevents the swinging of the rotating construction material (e.g., steel pipe pile) is located at the lower front of the lower leader 28. A rack gear 33, which is one of the components of the rack and pinion lifting device, is located at the center of the front side of the leader 15, and a pair of left and right guide pipes 34, 34 are continuously installed at the front ends of both widthwise sides over the entire length of the leader 15 (Figure 4).

[0016] The rack gear 33 is a vertically long, plate-like member having rows of teeth on both end surfaces thereof, and is divided into upper and lower halves at positions corresponding to the flange mating surfaces of the flange coupling portions 29, 30. The guide pipe 34 is similarly divided into upper and lower halves at positions corresponding to the flange mating surfaces. As shown in FIG. 5, the lower end of the upper divided guide pipe 34 is formed with a pair of left and right mating protrusions 34a, 34a, and the upper end of the lower divided guide pipe 34 is formed with a pair of left and right mating recesses 34b, 34b corresponding to the mating protrusions 34a, 34a. When the mating recesses 34a, 34b are spigot-fitted together, the upper and lower ends of the guide pipe 34, which have rectangular cross sections, abut against each other, and the boundary between the outer circumferential surfaces of the two ends is smoothly continuous (FIGS. 4 and 5).

[0017] As shown in Fig. 4 and other figures, the upper and lower ends of the pair of left and right guide pipes 34 are disposed in notches 29c (portions where both left and right corners of the front end are removed) formed by narrowing the front end of the flange 29a, specifically, on the front end side of the pair of left and right notches 29c. Meanwhile, gaps S1 are provided on the rear end side of the notches 29c in consideration of the attachment of an auger 35, which is an example of a working device. That is, gaps S1 are provided on the rear side of the guide pipes 34 between themselves and the flange 29a in the front-to-rear direction (left-to-right direction in Fig. 4).

[0018] A pair of left and right guide gibs 36, 36 that slide against the guide pipes 34, 34 are provided protruding rearward at the rear side of the auger 35, and a pair of left and right pinion gears 37, 37 in upper and lower multi-stages that mesh with the rack gear 33 are rotated and driven by auger lifting motors 38, 38. In this embodiment, three stages of pinion gear pairs (top, middle and bottom) are provided (six pinion gears in total), and the height of the entire device is large.

[0019] The auger 35 configured in this manner moves up and down along the front surface of the leader 15 in an engaged state in which a plate-shaped liner (made of resin) 36a attached to the guide gib 36 abuts against three surfaces (front and rear surfaces and outer surface) of the guide pipe 34. In this case, when the auger 35 passes through the flange joint portion 29, the above-mentioned gap S1 prevents contact between the guide gib 36 and the flange joint portion 29 (FIG. 4).

[0020] When using the pile driver 11 to bury steel pipes, the leader 15 is set in a vertically erect working position (Fig. 1). The steel pipe pile (not shown) is lifted by a rope hanging from the top sheave 31, and then its upper end is connected to a drive rod (rotating drive shaft) 39 via an adapter 40, while its lower end is held by a lower guide 32. The attached steel pipe pile is rotated by an auger drive motor 41, and is driven into the ground by lowering the auger 35 while still rotating.

[0021] On the other hand, when transporting the pile driver 11, the auger 35 is lowered to the lower leader 28, and then the bolts and nuts are removed at the flange joint 30 between the basic leader 26 and the lower leader 28 to separate the lower leader 28 from the basic leader 26 (making it rotatable via the connecting shaft 42), and the leader raising / lowering cylinder 16 is contracted to tilt the basic leader 26 and upper leader 27 backward as a unit, as shown in Figure 2, to assume a transport position.

[0022] When creating such a transportation posture, the leader 15 is bent via the connecting shaft (connecting pin) 42 that connects the basic leader 26 and the lower leader 28 (FIG. 7), as shown by comparing FIG. 3 with FIG. 7. Specifically, before the basic leader 26 is laid down, the link 43 provided on the lower leader 28 is rotated around its mounting pin 44, and the link 43 is fixed by the fixing pin 45 that has been inserted from the lower leader 28 side to the leader support 17 side, with the pin hole of the link connecting piece 17b provided on the front lower part of the leader support 17 aligned with the pin hole at the tip of the link 43.

[0023] In this way, the support shaft 25, the connecting shaft 42, the mounting pin 44, and the fixed pin 45 form a four-joint link with the leader support 17 as the fixed joint, and as the basic leader 26 falls backward, the connecting shaft 42 moves in an arc (rotates clockwise in Figures 3 and 7) from just below the support shaft 25 and moves forward, resulting in the lower leader 28 being lifted. That is, the relative positions of the leader support 17 and the lower leader 28 from their initial positions (Figure 3) change (Figure 7), and the lower leader 28 rotates relative to the basic leader 26 with the connecting shaft 42 as the center of rotation.

[0024] Incidentally, an auger 35 with a large height occupies more space in front of the lower leader 28 when in the transport position. In this case, it would be possible to attach and detach the lower guide 32 each time the machine is transported, but this would be cumbersome and would require measures to prevent the auger 35 from falling when removed. Therefore, the leader 15 is provided with a flange connection portion 30 that can hold the auger 35 together with the lower guide 32 in the transport position.

[0025] As shown in Figures 3 to 8, the flange connection portion 30 has an inclined flange 30a that slopes upward from the rear side (right side in Figure 3) to the front side (for example, an upward slope of approximately 50 degrees from the horizontal), and a flat flange 30b that extends forward from the front end (upper end) of the inclined flange 30a and is perpendicular (i.e., horizontal) to the length direction of the leader (up and down direction in Figure 3).

[0026] As shown in Figures 3, 6, and 8, the inclined flange 30a is formed in a substantially rectangular shape, with notches 30c, 30c formed at the rear end of the rectangular shape to narrow laterally. The narrow rear end is located near the support shaft 25 (Figure 3) and overlaps with the support shaft 25 when projected in the direction in which the inclined flanges 30a, 30a face each other (diagonally upward and rearward perpendicular to the flange mating surface) (Figure 6). Therefore, the bolt fastening of the flange coupling portion 30 is mainly configured using bolts and nuts, but as can be seen from Figures 3 and 6, in consideration of the ease of use of a tightening tool (e.g., a wrench), the rear end is provided with multiple tapped holes 30d along the cut surfaces of the notches 30c, 30c.

[0027] In addition, the front end 17a of the leader support 17 is located within the notches 30c, 30c (the portion where both the left and right corners of the rear end are cut away), and as a result, as can be seen by comparing Figures 3 and 7, when changing the position from the working position (Figure 3) in which the leader 15 is upright vertically to the transportation position (Figure 7) in which the bolt fastening of the flange connecting portion 30 is released and the basic leader 26 is tilted backward, or vice versa, contact between the flange connecting portion 30 and the front end 17a of the leader support 17 caused by the rotation of the basic leader 26 around the support shaft 25 is avoided.

[0028] As shown in Fig. 8 and other figures, the flat flange 30b is formed in a rectangular shape narrower than the left-right width of the inclined flange 30a, and the spaces at both left and right ends formed by the narrowing are substantially identical in shape and function to the notches 29c, 29c provided in the other flange 29a (see also Fig. 4). Therefore, the rear half of the space is equivalent to the gap S1, that is, gaps S2, S2 are provided in the front-rear direction (left-right direction in Fig. 8) between the inclined flange 30a and the rear surface side of the guide pipes 34, 34. As a result, when the auger 35 passes through the flange joint portion 30, the gap S2 prevents contact between the guide gib 36 and the flange joint portion 30.

[0029] When the pile driver 11 is changed from the working position to the transport position, the flange connection portion 30 configured in this manner is released from the bolt fastening in a predetermined procedure after the auger 35, which moves downward along the guide pipe 34, has passed through. At this time, the auger 35 is held integrally with the lower guide 32 in front of the lower leader 28 with all pinion gears 37 meshed with the rack gear 33. After that, by integrally tilting the basic leader 26 and the upper leader 27 backward, the facing inclined flanges 30a, 30a and the flat flanges 30b, 30b move away from each other at an angle (approximately 90 degrees), forming a V-shape overall (Fig. 2).

[0030] Furthermore, when the pile driver 11 is in the transport position, as shown in Figure 7, the lower leader 28 is held upright by a link 43 interposed between it and the leader support 17, which restricts its rotation around the connecting shaft 42 and keeps it in an upright position, ensuring a length that allows the auger 35 and lower guide 32 to be arranged side by side, while keeping the position of its upper end (flat flange 30b) at a length that does not exceed the height of the basic leader 26.

[0031] As described above, according to the pile driver 11 of the present invention, the flange joint 30 between the basic leader 26 and the lower leader 28 has an upward inclination from the rear side to the front side, so that it is possible to extend the front face of the lower leader 28 upward without changing the overall height in the transport position from the conventional one, and even an auger 35 with a large height can be held in the transport position integrally with the lower guide 32. Moreover, because the lower guide 32 also functions as a support for the auger 35, there is an advantage in that the number of parts can be reduced compared to when an alternative part is used for support.

[0032] Furthermore, since the flange connection portion 30 is provided with a notch 30c that avoids contact with the front end portion 17a of the leader support 17, the inclined flange connection portion 30 can be attached to the leader 15 in a natural manner, and since this does not affect the change in position between the working position and the transport position, it contributes to the safe and smooth operation of the pile driver 11.

[0033] The present invention is not limited to the above-described embodiment, and the configuration of each part, such as the flange connection between the basic leader and the lower leader and the spigot fitting of the guide pipe, can be modified as needed in terms of shape, size, and arrangement (inclination, etc.) as long as the dimensional relationship taking into account the strength and movement of the leader is satisfied. Furthermore, the length and cross-sectional shape of the leader member, and the specifications of various devices such as the auger and lower guide are optional. Furthermore, even if a larger auger is installed later, it is only necessary to replace the basic leader and lower leader as a set, which broadens the range of applications in the various environments in which small pile drivers are used. [Explanation of symbols]

[0034] 11...pile driver, 12...lower running body, 13...upper rotating body, 14...base machine, 15...leader, 16...leader derricking cylinder, 17...leader support, 17a...front end, 17b...link connecting piece, 18...pipe support member, 19...operator's cab, 20...equipment room, 21...jack, 22...counterweight, 23...cylinder bracket, 24...connecting pin, 25...support shaft, 26...basic leader, 27...upper leader, 28...lower leader, 29...flange connection portion, 29a...flange, 29b...bolt hole, 29c...notch, 30...flange connection Joint portion, 30a...inclined flange, 30b...flat flange, 30c...notch, 30d...tapped hole, 31...top sheave, 32...lower guide, 33...rack gear, 34...guide pipe, 34a...fitting convex portion, 34b...fitting concave portion, 35...auger, 36...guide gib, 36a...liner, 37...pinion gear, 38...auger lifting motor, 39...drive rod, 40...adapter, 41...auger drive motor, 42...connecting shaft, 43...link, 44...mounting pin, 45...fixing pin, 46...leader left / right inclined cylinder, 47...connecting pin

Claims

1. a leader provided at least movably via a leader support at the front of the base machine; a working device provided along the front surface of the reader so as to be able to move up and down; a lower guide provided on a lower front surface of the reader; The reader a basic reader pivotally supported on a front end of the reader support so as to be rotatable in the front-rear direction; a lower leader detachably connected to a lower end of the basic leader; a flange connection portion formed by fastening flanges of the basic leader and the lower leader together with bolts, In a pile driver that can change its posture between a working posture in which the leader is vertically erected and a transport posture in which the working device and the lower guide are integrally held on the front surface of the lower leader, and the bolt fastening of the flange joint portion is released and the basic leader is tilted backward, The pile driver is characterized in that the flange connection portion has an inclination that increases upward from the rear side to the front side.

2. 2. The pile driver according to claim 1, wherein the flange connecting portion is provided with a notch for avoiding contact with the front end portion of the leader support.

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