JP7248883B2 - Pile chucking device for dumping hopper of pile driver - Google Patents

Description

The present disclosure relates to a pile chucking device for a dumping hopper of a pile driver.

As a method of embedding hollow prefabricated piles, a middle excavation method has been conventionally used. A pile driver used in the inner excavation method includes an auger driving device and an earth removal hopper attached to a mast so as to be capable of vertical movement. A spiral auger is attached to the auger driving device through the unloading hopper, and a prefabricated pile is connected to the unloading hopper via a chucking device. The spiral auger is arranged so as to pass through the prefabricated pile, and can sink the prefabricated pile into the pile hole while excavating the ground with a drill at the tip of the spiral auger. The earth and sand excavated by the spiral auger are carried upward within the ready-made pile by the spiral auger and temporarily accumulated in the earth removal hopper.

For example, the chucking device disclosed in Non-Patent Document 1 has a cylindrical body with a sideward opening formed in the body. A rod is horizontally slidably inserted through the opening, and the rod is connected to the hydraulic cylinder via a swingable substantially triangular link plate. As the link plate swings according to the expansion and contraction of the hydraulic cylinder, the rod can reciprocate in the horizontal direction.
In addition, as disclosed in Non-Patent Document 1, when holding a pile, the chucking device does not directly hold the pile head, but through a pile hanging device or a jack attached to the pile head. It may be configured to indirectly hold the

"Hyper NAKS II", [online], Nippon Concrete Co., Ltd., [searched on November 15, 2018], Internet (URL: https://www.ncic.co.jp/foundation/pdf/Hyper-Naks2. pdf)

The chucking device disclosed in Non-Patent Document 1 employs a swinging slider crank mechanism, in which a hydraulic cylinder is obliquely provided swingably with respect to the body. For this reason, the lower end of the hydraulic cylinder and the link plate protrude radially outward from the cylindrical body. There is a risk that the king device will be damaged. For this reason, when connecting piles to the unloading hopper, workers are required to pay close attention.

In view of the above circumstances, an object of at least one embodiment of the present invention is to provide an earth discharge hopper for a small pile driver that can easily connect a pile with the earth discharge hopper of a pile driver used in an excavation method. To provide a chucking device.

(1) A pile chucking device for a dumping hopper of a pile driver according to at least one embodiment of the present invention,
A cylindrical body that can be integrated with or connected to a dumping hopper of a pile driver, the body having a plurality of openings facing sideways at different positions in the circumferential direction of the body ,
a plurality of variable slide blocks slidably inserted into each of the plurality of openings along the radial direction of the body ;
A plurality of drive cylinders provided corresponding to the positions of the plurality of variable slide blocks in the circumferential direction of the body, and spaced apart from the corresponding variable slide blocks in the axial direction of the body. and a plurality of drive cylinders respectively arranged outside the body along the axial direction of the body and capable of extending and contracting along the axial direction of the body ;
a plurality of link mechanisms respectively provided between the variable slide blocks and the drive cylinders corresponding to each other, the link mechanisms for transmitting the driving force of the drive cylinders to the variable slide blocks; , and
The link mechanism is
a crank arm;
a swing arm;
a bracket secured to the torso;
one end side of the crank arm portion is pin-joined to the drive cylinder via a first pin extending in a tangential direction of the body portion and forming a power point for inputting power of the drive cylinder;
The other end side of the crank arm portion extends in the tangential direction of the body portion and is configured as a fulcrum for transmitting the power of the drive cylinder from the crank arm portion to the rocking arm portion. integrally rotatably joined to one end of the swing arm,
The other end side of the rocking arm portion is connected through a third pin extending in the tangential direction of the body portion and forming a point of action for transmitting the power of the drive cylinder from the drive arm portion to the variable slide block. and can be pin-connected to the variable slide block,
the second pin is rotatably supported by the bracket;
The crank arm portion is swingable around the fulcrum by the driving force of the drive cylinder ,
The swing arm portion is capable of swinging about the fulcrum in conjunction with swinging of the crank arm portion ,
The pin hole of the swing arm through which the third pin is inserted allows the distance between the second pin and the third pin to change in conjunction with the swing of the swing arm. has an oval shape as
The variable slide block has a gripping position capable of gripping a pile and a position capable of releasing the gripping of the pile in conjunction with the swinging movement of the swinging arm portion in a radial direction of the trunk portion relative to the gripping position. radially displaceable of said barrel between an outer rest position and
the variable slide block is located at the rest position when the drive cylinder is in the extended state, and the variable slide block is located at the gripping position when the drive cylinder is in the contracted state;
The force point is located radially inside the trunk portion relative to the fulcrum.

According to the above configuration (1), the point of force at which the driving force of the drive cylinder is input to the crank arm portion is located radially inside the body with respect to the fulcrum. can be placed in As a result, the size of the chucking device can be reduced in the radial direction of the barrel.

(2) In some embodiments, in the above configuration (1),
The link mechanism includes a connecting rod portion for connecting the drive cylinder and the crank arm portion. It is pin- connected to the driving cylinder and the crank arm portion through the respective pins.

According to the above configuration (2), by connecting the drive cylinder and the crank arm through the connecting rod, it is possible to secure a distance between the drive cylinder and the crank arm. As a result, the power point can be arranged closer to the body than the fulcrum while avoiding interference between the crank arm portion and the drive cylinder and the body.

According to at least one embodiment of the present invention, there is provided a chucking device for a dumping hopper of a small-sized pile driver that can easily connect the dumping hopper of a pile driver and a pile used in an excavation method.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view schematically showing a pile driver to which a pile chucking device for a dumping hopper of a pile driver according to one embodiment of the present invention is applied; FIG. 3 is a front view schematically showing the chucking device together with the pile head of the prefabricated pile and the yattko attached to the pile head of the prefabricated pile. It is a side view which shows a chucking apparatus roughly. It is a top view (upper surface) which shows a chucking apparatus roughly. It is a bottom view which shows a chucking apparatus roughly. It is a front view which shows some chucking apparatuses roughly. It is a side view which shows a part of chucking apparatus roughly. FIG. 4 is a plan view schematically showing part of the chucking device; FIG. 4 is a schematic front view of part of the chucking device in operation; FIG. 4 is a schematic front view of part of the chucking device in an inoperative state;

Several embodiments of the present invention will now be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention, and are merely illustrative examples. do not have.
For example, expressions denoting relative or absolute arrangements such as "in a direction", "along a direction", "parallel", "perpendicular", "center", "concentric" or "coaxial" are strictly not only represents such an arrangement, but also represents a state of relative displacement with a tolerance or an angle or distance to the extent that the same function can be obtained.
For example, expressions such as "identical", "equal", and "homogeneous", which express that things are in the same state, not only express the state of being strictly equal, but also have tolerances or differences to the extent that the same function can be obtained. It shall also represent the existing state.
For example, expressions that express shapes such as squares and cylinders do not only represent shapes such as squares and cylinders in a geometrically strict sense, but also include irregularities and chamfers to the extent that the same effect can be obtained. The shape including the part etc. shall also be represented.
On the other hand, the expressions "comprising", "comprising", "having", "including", or "having" one component are not exclusive expressions excluding the presence of other components.

FIG. 1 schematically shows a pile driver 3 to which a dumping hopper pile chucking device (hereinafter also referred to as a chucking device) 1 according to one embodiment of the present invention is applied. FIG. 2 is a front view schematically showing the chucking device 1 together with the pile head of the prefabricated pile 5 and the jack 7 attached to the pile head of the prefabricated pile 5. FIG. FIG. 3 is a side view schematically showing the chucking device 1. FIG. FIG. 4 is a plan view (upper surface) schematically showing the chucking device 1. FIG. FIG. 5 is a bottom view schematically showing the chucking device 1. FIG. FIG. 6 is a front view schematically showing part of the chucking device 1. FIG. FIG. 7 is a side view schematically showing part of the chucking device 1. FIG. FIG. 8 is a plan view schematically showing part of the chucking device 1. FIG. FIG. 9 is a front view schematically showing part of the chucking device 1 in operation. FIG. 10 is a front view schematically showing part of the chucking device 1 in a non-operating state.

As shown in FIG. 1, the chucking device 1 is provided so as to be integrated with or connectable to a dumping hopper 9 of a pile driver 3 used in the middle moat construction method.
Specifically, the unloading hopper 9 is attached to the mast 11 of the pile driver 3 so as to be vertically movable together with the driving motor 13 . The driving motor 13 is positioned above the unloading hopper 9 , and the spiral drill 15 is connected to the lower side of the driving motor 13 . The spiral drill 15 extends downward through the unloading hopper 9 .

The chucking device 1 is located below the unloading hopper 9 and can indirectly hold the pile head of the hollow prefabricated pile 5 via the jack 7 or a pile hanging device (not shown). The spiral drill 15 penetrates through the hollow portion of the prefabricated pile 5 , and by rotating the spiral drill 15 with the drive motor 13 , the tip of the spiral drill 15 can excavate the ground. The excavated soil is conveyed upward through the interior of the ready-made pile 5 by the spiral drill 15, temporarily stored in the soil discharge hopper 9, and discharged to the outside as appropriate.
Note that the chucking device 1 may be capable of directly holding the pile head portion of the ready-made pile 5 . Moreover, the type of the ready-made pile 5 is not particularly limited, and may be a steel pipe pile, an SC pile (concrete pile with outer shell steel pipe), a PC pile (prestressed concrete pile), or the like.

As shown in FIGS. 2 to 5, the chucking device 1 includes a body 20, a variable slide block 22, a drive cylinder 24, and a link mechanism .
The trunk portion 20 has a tubular shape (for example, a cylindrical shape), and can receive therein the pile head of the prefabricated pile 5 to be gripped (held), the jack 7, or the pile hoisting device. The body 20 has a laterally directed opening 28 (see FIG. 6). In this embodiment, the barrel 20 is provided with two openings 28 that are diametrically spaced from each other.

The variable slide block 22 has, for example, a prismatic shape, and is slidably inserted through each opening 28 along the horizontal direction.
The drive cylinder 24 is arranged along the axial direction of the body portion 20 . In this embodiment, a column 30 projecting upward in the axial direction from the body portion 20 is provided integrally with the body portion 20 , and the upper end of the driving cylinder 24 is attached to the column 30 .
Although the drive cylinder 24 is a hydraulic cylinder, it may be a pneumatic cylinder or the like.

The link mechanism 26 is for transmitting the driving force of the drive cylinder 24 to the variable slide block 22 and includes a crank arm portion 32 and a swing arm portion 34 .
The crank arm portion 32 can swing around the fulcrum F by the driving force of the drive cylinder 24 .
The swing arm portion 34 connects the variable slide block 22 and the crank arm portion 32 , and can swing around the fulcrum F in conjunction with the swing of the crank arm portion 32 .
In the link mechanism 26 , the power point A at which the driving force of the drive cylinder 24 is input to the crank arm portion 32 is located radially inside the trunk portion 20 with respect to the fulcrum F.

A method of using the chucking device 1 will be described below.
As shown in FIG. 9, drive cylinder 24 has cylinder tube 36 and cylinder rod 38 . By controlling the supply of hydraulic pressure to the drive cylinder 24, the amount of protrusion of the cylinder tube 36 from the cylinder rod 38 can be controlled. For example, FIG. 9 shows drive cylinder 24 in a retracted state and FIG. 10 shows drive cylinder 24 in an extended state.

As shown in FIG. 9, when the supply of hydraulic pressure to the drive cylinder 24 is controlled and the drive cylinder 24 is contracted, the point of force A is positioned above the fulcrum F, and the point of action E is the diameter of the body 20. It is located inside the fulcrum F in the direction. In this state, the variable slide block 22, which is connected to the swing arm portion 34 at the point of action E, is positioned radially inward of the trunk portion 20 as compared with the case of FIG. In this manner, in the state (operating state) shown in FIG. 9 , in the radial direction of the body portion 20, the inner end side of the variable slide block 22 protrudes inward from the body portion 20 by a large amount, and is an object to be gripped. It can be engaged with the pile head of the prefabricated pile 5, the yattco 7 or the pile hoisting device.

On the other hand, as shown in FIG. 10, when the supply of hydraulic pressure to the drive cylinder 24 is controlled and the drive cylinder 24 is extended, the point of force A is positioned below the fulcrum F, and the point of action E is located on the body 20. is located outside the fulcrum F in the radial direction of the . In this state, the variable slide block 22, which is connected to the swing arm portion 34 at the point of action E, is positioned radially outward of the trunk portion 20 compared to the case of FIG. Thus, in the state (non-operating state) shown in FIG. The engagement with the pile head of a prefabricated pile 5, the jack 7 or the pile hoisting device is released.

According to the above configuration, the power point A at which the driving force of the drive cylinder 24 is input to the crank arm portion 32 is located radially inside the body portion 20 with respect to the fulcrum F, so that the drive cylinder 24 can be moved toward the body. It can be arranged near the part 20 . As a result, the size of the chucking device 1 can be reduced in the radial direction of the body portion 20 .

In some embodiments, linkage 26 includes a connecting rod portion 40 for connecting drive cylinder 24 and crank arm portion 32 . The connecting rod portion 40 is pin-connected to the drive cylinder 24 and the crank arm portion 32, respectively. In this case, the link mechanism 26 is configured by a reciprocating slider crank mechanism.

According to the above configuration, a distance can be secured between the drive cylinder 24 and the crank arm portion 32 by connecting the drive cylinder 24 and the crank arm portion 32 via the connecting rod portion 40 . As a result, the force point A can be arranged closer to the body portion 20 than the fulcrum F while avoiding the crank arm portion 32 and the drive cylinder 24 from interfering with the body portion 20 .

In some embodiments, the connecting rod portion 40 has two plates 40a, 40b and a cylindrical portion 40c interconnecting the two plates 40a, 40b. Between the two plates 40a and 40b, a space corresponding to the cylindrical portion 40c is provided. The two plates 40a and 40b have a P-shaped contour in plan view, with the upper portion being enlarged more than the lower portion. The tip of the cylinder rod 38 of the drive cylinder 24 is sandwiched between the upper portions of the plates 40a and 40b, and a pin 42 is inserted through the tip of the cylinder rod 38 and the plates 40a and 40b. For example, the pin 42 is configured by a bolt, and the pin 42 is prevented from coming off by screwing a nut onto the bolt.

The crank arm portion 32 has a rod shape or a block shape, and a plan view shape is an ellipse shape or an oval shape. One end of the crank arm portion 32 is sandwiched between the lower portions of the plates 40a and 40b, and a pin 44 is inserted through the one end of the crank arm portion 32 and the plates 40a and 40b. The pin 44 is provided parallel to the pin 42 and constitutes a power point A at which the driving force of the drive cylinder 24 is input to the crank arm portion 32 . For example, both ends of the pin 44 are rigidly joined to the lower ends of the plates 40 a and 40 b by welding, and the crank arm portion 32 is rotatable relative to the pin 44 .
Preferably, pin 44 is located radially closer to body 20 than pin 42 is.

On the other hand, a pin 46 is secured to the other end of the crank arm portion 32 in parallel with the pin 44 . The pin 46 extends on both sides of the crank arm portion 32 , and the upper end portion of the swing arm portion 34 is fixed to the tip of the pin 46 . Accordingly, the crank arm portion 32, the pin 46 and the swing arm portion 34 constitute one rigid body.
The chucking device 1 has a U-shaped bracket 48 in a plan view, and the bracket 48 is attached to the body 20 so as to cover the lower ends of the plates 40 a and 40 b and the crank arm 32 . . The pin 46 slidably penetrates both side walls of the bracket 48 and is rotatably supported by the bracket 48 . That is, the pin 46 constitutes the fulcrum F.

The swing arm portion 34 is composed of a pair of plates 34a and 34b arranged parallel to each other so as to sandwich the bracket 48 therebetween. A tip of a pin 46 is fixed to the upper ends of the plates 34a and 34b, and the plates 34a and 34b can swing as the pin 46 rotates.
The lower ends of the pair of plates 34a and 34b are arranged on both sides of the variable slide block 22, and a pin 50 is inserted through the lower ends of the plates 34a and 34b and the variable slide block 22 in that state. Here, the pin holes 38c of the plates 34a and 34b through which the pins 50 are inserted have oval shapes in order to allow the pins 50 to move vertically when the swinging arm portion 34 swings. .
The pins 42 , 44 , 46 , 50 are all arranged parallel to the tangential direction of the body 20 .
For example, the pin 50 is configured by a bolt, and the pin 50 is retained by attaching a washer and a retainer to the bolt.

The variable slide block 22 has, for example, a prismatic shape. The variable slide block 22 is provided with a plurality of pin holes 52 along the tangential direction of the body portion 20 . The pin 50 is inserted through one of the pin holes 52. By selecting the pin hole 52, it is possible to adjust the amount of protrusion of the variable slide block 22 to the inside of the body 20 in the operating state and the non-operating state. be.
For example, the chucking device 1 has a rectangular tube-shaped guide 54 , and the guide 54 is attached to the body 20 so that the hollow portion of the guide 54 communicates with the opening 28 . The variable slide block 22 is inserted through the guide 54 and is movable while being guided by the guide 54 . In order to allow the horizontal movement of the pin 50, both side walls of the guide 54 are provided with oval guide holes 54a and 54b.
For example, bracket 48 is positioned over guide 54 and bracket 48 and guide 54 are welded together. Also for example, the bracket 48 and the guide 54 are welded to the body 20 . Furthermore, a reinforcing plate 55 is attached to the lower side of the bracket 48 . The overall structure of the link mechanism 26 is such that the swing range of the lower end of the swing arm portion 34 substantially corresponds to the length of the guide 54 in the radial direction of the trunk portion 20 .

Sleeves 56a and 56b are fitted around the pin 46, and the sleeves 56a and 56b adjust the distance between the side wall of the bracket 48 and the crank arm portion 32 and the distance between the side wall of the bracket 48 and the plates 34a and 34b. Each is properly maintained.

Finally, the present invention is not limited to the above-described embodiments, and includes modifications of the above-described embodiments and combinations thereof.
For example, in the embodiment described above, the cylinder tube 36 of the drive cylinder 24 was rigidly joined to the strut 30, but it may be pinned. In other words, the cylinder tube 36 may be swingable with respect to the strut 30 . In this case, the connecting rod portion 40 and the drive cylinder 24 may be rigidly joined, or the connecting rod portion 40 may be omitted and the drive cylinder 24 and the crank arm portion 32 may be directly pin-joined.

1 Unloading hopper chucking device of pile driver 3 Pile driver 5 Ready-made pile 7 Yatco 9 Unloading hopper 11 Mast 13 Drive motor 15 Spiral drill 20 Body 22 Variable slide block 24 Drive cylinder 26 Link mechanism 28 Opening 30 Column 32 Crank arm portion 34 Swing arm portions 34a, 34b Plate 34c Pin hole 36 Cylinder tube 38 Cylinder rod 40 Connecting rod portions 40a, 40b Plate 40c Cylindrical portion 42, 44, 46, 50 Pin 48 Bracket 52 Pin hole 54 Guide 54a , 54b Guide hole 55 Reinforcement plate 56a, 56b Sleeve A Force point F Support point E Action point

Claims (2)

A cylindrical body that can be integrated with or connected to a dumping hopper of a pile driver, the body having a plurality of openings facing sideways at different positions in the circumferential direction of the body ,
a plurality of variable slide blocks slidably inserted into each of the plurality of openings along the radial direction of the body ;
A plurality of drive cylinders provided corresponding to the positions of the plurality of variable slide blocks in the circumferential direction of the body, and spaced apart from the corresponding variable slide blocks in the axial direction of the body. and a plurality of drive cylinders respectively arranged outside the body along the axial direction of the body and capable of extending and contracting along the axial direction of the body ;
a plurality of link mechanisms respectively provided between the variable slide blocks and the drive cylinders corresponding to each other, the link mechanisms for transmitting the driving force of the drive cylinders to the variable slide blocks; , and
The link mechanism is
a crank arm;
a swing arm;
a bracket secured to the torso;
one end side of the crank arm portion is pin-joined to the drive cylinder via a first pin extending in a tangential direction of the body portion and forming a power point for inputting power of the drive cylinder;
The other end side of the crank arm portion extends in the tangential direction of the body portion and is configured as a fulcrum for transmitting the power of the drive cylinder from the crank arm portion to the rocking arm portion. integrally rotatably joined to one end of the swing arm,
The other end side of the rocking arm portion is connected through a third pin extending in the tangential direction of the body portion and forming a point of action for transmitting the power of the drive cylinder from the drive arm portion to the variable slide block. and can be pin-connected to the variable slide block,
the second pin is rotatably supported by the bracket;
The crank arm portion is swingable around the fulcrum by the driving force of the drive cylinder ,
The swing arm portion is capable of swinging about the fulcrum in conjunction with swinging of the crank arm portion ,
The pin hole of the swing arm through which the third pin is inserted allows the distance between the second pin and the third pin to change in conjunction with the swing of the swing arm. has an oval shape as
The variable slide block has a gripping position capable of gripping a pile and a position capable of releasing the gripping of the pile in conjunction with the swinging movement of the swinging arm portion in a radial direction of the trunk portion relative to the gripping position. radially displaceable of said barrel between an outer rest position and
the variable slide block is located at the rest position when the drive cylinder is in the extended state, and the variable slide block is located at the gripping position when the drive cylinder is in the contracted state;
A pile chucking device for a dumping hopper of a pile driver, wherein the force point is located radially inside the body portion relative to the fulcrum. The link mechanism includes a connecting rod portion for connecting the drive cylinder and the crank arm portion,
The connecting rod portion is pin-joined to the drive cylinder and the crank arm portion via a fourth pin and the first pin, respectively, extending in a tangential direction of the body portion. Item 2. A pile chucking device for a dumping hopper of a pile driver according to item 1.

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