JP2020101025A - Pile chucking device for earth removing hopper of pile driver - Google Patents

Abstract

To provide a small-sized chucking device for an earth removing hopper of a pile driver which can easily connect an earth removing hopper of a pile driver used in an inner excavation method with a pile.SOLUTION: A chucking device for an earth removing hopper of a pile driver comprises: a cylinder-shaped trunk portion which is integral with or can connect with an earth removing hopper of a pile driver, and includes an opening facing a lateral side; a variable slide block inserted in the opening in a horizontal direction so as to freely slide; a driving cylinder disposed in an axial direction of the trunk portion; and a link mechanism for transmitting driving force of the driving cylinder to the variable slide block. The link mechanism includes: a crank arm portion capable of oscillating around a fulcrum by driving force of the driving cylinder; and an oscillating arm portion capable of oscillating around the fulcrum in conjunction with oscillation of the crank arm portion, and connecting the variable slide block with the crank arm portion. A power point in which driving force of the driving cylinder is inputted into the crank arm portion is positioned inside in a radial direction of the trunk portion with respect to the fulcrum.SELECTED DRAWING: Figure 9

Description

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

As a method for embedding hollow prefabricated piles, the hollow excavation method has been used conventionally. A pile driving machine used for the medium excavation method includes an auger drive device and a soil discharging hopper that are vertically movable on a mast. A spiral auger is attached to the auger drive device through the earth hopper, while a ready-made pile is connected to the earth hopper via a chucking device. The spiral auger is arranged so as to penetrate through the prefabricated pile, and the prefabricated pile can be sunk into the pile hole while excavating the ground by the drill at the tip of the spiral auger. Then, the earth and sand excavated by the spiral auger is carried upward by the spiral auger in the ready-made pile and is temporarily accumulated in the earth discharging hopper.

For example, the chucking device disclosed in Non-Patent Document 1 has a cylindrical body portion, and the body portion is formed with a laterally facing opening. A rod is slidably inserted in the opening in the horizontal direction, and the rod is connected to a hydraulic cylinder via a swingable substantially triangular link plate. The link plate swings in response to expansion and contraction of the hydraulic cylinder, whereby the rod can reciprocate in the horizontal direction, and by pushing the rod into the body portion, the pile or the yatco can be held.
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 suspension device or a yatco attached to the pile head. It may be configured to hold indirectly.

"Hyper NAKS II", [online], Nippon Concrete Co., Ltd. [Search 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 swing slider crank mechanism, and a hydraulic cylinder is obliquely provided so as to be swingable with respect to a body. For this reason, the lower end side of the hydraulic cylinder and the link plate project to the outside in the radial direction of the cylindrical body, and when connecting the pile to the soil discharge hopper, the wire that suspends the pile gets caught in the hydraulic cylinder, etc. The king device may be damaged. Therefore, when connecting the piles to the soil discharging hopper, the workers are required to pay close attention.

In view of the above-mentioned circumstances, an object of at least one embodiment of the present invention is for a small pile excavator hopper that can easily connect the soil excavator hopper of the pile driver used in the medium excavation method and the pile. It is to provide a chucking device.

(1) A pile chucking device for a soil discharging hopper of a pile driver according to at least one embodiment of the present invention,
A tubular body portion that can be integrated with or connected to the soil discharging hopper of the pile driver, and has a side-facing opening,
A variable slide block slidably inserted into the opening along the horizontal direction,
A drive cylinder arranged along the axial direction of the body,
A link mechanism for transmitting the driving force of the drive cylinder to the variable slide block,
The link mechanism is
A crank arm portion capable of swinging around a fulcrum by the driving force of the drive cylinder;
A swing arm portion that is swingable around the fulcrum in conjunction with swing of the crank arm portion and that connects the variable slide block and the crank arm portion,
The force point at which the driving force of the drive cylinder is input to the crank arm portion is located inside the fulcrum in the radial direction of the body portion.

According to the above configuration (1), since the force point at which the driving force of the drive cylinder is input to the crank arm portion is located inside the fulcrum in the radial direction of the body portion, the drive cylinder is located near the body portion. Can be placed at. As a result, the chucking device can be downsized in the radial direction of the body.

(2) In some embodiments, in the above configuration (1),
The link mechanism includes a connecting rod portion for connecting the driving cylinder and the crank arm portion, and the connecting rod portion is pin-joined to the driving cylinder and the crank arm portion, respectively.

According to the above configuration (2), the distance between the drive cylinder and the crank arm portion can be secured by connecting the drive cylinder and the crank arm portion via the connecting rod portion. As a result, the force point can be arranged closer to the trunk than the fulcrum, while avoiding interference between the crank arm and the drive cylinder with the trunk.

According to at least one embodiment of the present invention, there is provided a small-sized excavation hopper chucking device for a pile driving machine, which can easily connect the soil discharging hopper of the pile driving machine used in the medium excavation method and the pile.

It is explanatory drawing which shows roughly the pile driving machine which applied the pile chucking apparatus for earth removal hoppers of the pile driving machine which concerns on one Embodiment of this invention. It is a front view which shows roughly the chucking apparatus with the pile head of a ready-made pile and the Yatco attached to the pile head of a ready-made pile. It is a side view which shows the chucking apparatus schematically. It is a top view (upper surface) which shows roughly a chucking device. It is a bottom view which shows the chucking apparatus schematically. It is a front view which shows a part of chucking apparatus schematically. It is a side view which shows a part of chucking apparatus schematically. It is a top view which shows a part of chucking apparatus schematically. It is a front view which shows schematically some chucking apparatuses in an operation state. It is a front view which shows schematically some chucking apparatuses in a non-operating state.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described as the embodiments or shown in the drawings are not intended to limit the scope of the present invention thereto, but are merely illustrative examples. Absent.
For example, the expression "relative or absolute" such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric" or "coaxial" is strict. In addition to representing such an arrangement, it also represents a state of relative displacement or a relative displacement with an angle or distance to the extent that the same function can be obtained.
For example, expressions such as "identical", "equal", and "homogeneous" that indicate that they are in the same state are not limited to strict equality, but also include tolerances or differences in the degree to which the same function is obtained. It also represents the existing state.
For example, the representation of a shape such as a quadrangle or a cylinder does not only represent a shape such as a quadrangle or a cylinder in a geometrically strict sense, but also an uneven portion or a chamfer within a range in which the same effect can be obtained. The shape including parts and the like is also shown.
On the other hand, the expressions “comprising”, “comprising”, “comprising”, “including”, or “having” one element are not exclusive expressions that exclude the presence of another element.

FIG. 1 schematically shows a pile driving machine 3 to which a pile chucking device (hereinafter, also referred to as a chucking device) 1 for a soil discharging hopper of a pile driving machine according to an 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 ready-made pile 5 and the yatco 7 attached to the pile head of the ready-made pile 5. FIG. 3 is a side view schematically showing the chucking device 1. FIG. 4 is a plan view (top surface) schematically showing the chucking device 1. FIG. 5 is a bottom view schematically showing the chucking device 1. FIG. 6 is a front view schematically showing a part of the chucking device 1. FIG. 7 is a side view schematically showing a part of the chucking device 1. FIG. 8 is a plan view schematically showing a part of the chucking device 1. FIG. 9 is a front view schematically showing a part of the chucking device 1 in the operating state. FIG. 10 is a front view schematically showing a part of the chucking device 1 in the inoperative state.

As shown in FIG. 1, the chucking device 1 is provided so as to be integrated with or connectable to the earth discharging hopper 9 of the pile driving machine 3 used in the middle excavation method.
Specifically, the soil discharging hopper 9 is attached to the mast 11 of the pile driving machine 3 so as to be vertically movable together with the drive motor 13. The drive motor 13 is located above the soil discharging hopper 9, and a spiral drill 15 is connected to the lower side of the drive motor 13. The spiral drill 15 penetrates the soil discharging hopper 9 and extends downward.

The chucking device 1 is located below the soil discharging hopper 9 and can indirectly hold the pile heads of the hollow prefabricated piles 5 via the yatco 7 or a pile suspension device (not shown). The spiral drill 15 penetrates the hollow portion of the ready-made pile 5, and by rotating the spiral drill 15 by the drive motor 13, the ground can be excavated by the tip of the spiral drill 15. Then, the excavated earth and sand is conveyed upward by the spiral drill 15 through the inside of the ready-made pile 5, is temporarily stored in the earth discharge hopper 9, and is appropriately discharged to the outside.
The chucking device 1 may be capable of directly holding the pile heads of the ready-made piles 5. The type of the ready-made piles 5 is not particularly limited, and may be steel pipe piles, SC piles (concrete piles with outer shell steel pipes), PC piles (prestressed concrete piles), or the like.

As shown in FIGS. 2 to 5, the chucking device 1 includes a body portion 20, a variable slide block 22, a drive cylinder 24, and a link mechanism 26.
The body 20 has a tubular shape (for example, a cylindrical shape), and can receive the pile head of the ready-made pile 5 to be gripped (holding target), the yatco 7 or the pile suspension device inside. Further, the body portion 20 has an opening 28 (see FIG. 6) which faces the side. In the present embodiment, the body portion 20 is provided with two openings 28 which are separated from each other in the diametrical direction of the body portion 20.

The variable slide block 22 has, for example, a prismatic shape, and is slidably inserted in each opening 28 along the horizontal direction.
The drive cylinder 24 is arranged along the axial direction of the body portion 20. In the present embodiment, a column 30 projecting upward from the body 20 in the axial direction is integrally provided with the body 20, and the upper end of the drive cylinder 24 is attached to the column 30.
The drive cylinder 24 is a hydraulic cylinder, but 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 driving cylinder 24.
The swing arm portion 34 is for connecting the variable slide block 22 and the crank arm portion 32, and is swingable around the fulcrum F in conjunction with the swing of the crank arm portion 32.
In the link mechanism 26, the force point A at which the driving force of the drive cylinder 24 is input to the crank arm portion 32 is located inside the fulcrum F in the radial direction of the body portion 20.

Hereinafter, a method of using the chucking device 1 will be described.
As shown in FIG. 9, the drive cylinder 24 has a cylinder tube 36 and a 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 the drive cylinder 24 in a contracted state, and FIG. 10 shows the drive cylinder 24 in an expanded state.

As shown in FIG. 9, when the supply of hydraulic pressure to the drive cylinder 24 is controlled to bring the drive cylinder 24 into the contracted state, the force point A is located above the fulcrum F and the point of action E is the diameter of the body portion 20. It is located inside the fulcrum F in the direction. In this state, the variable slide block 22 connected to the swing arm portion 34 at the point of action E is located inside in the radial direction of the body portion 20 as compared with the case of FIG. As described above, in the state (operating state) shown in FIG. 9, the amount of protrusion of the inner end side of the variable slide block 22 toward the inside of the body portion 20 in the radial direction of the body portion 20 is large, and the object is to be gripped. It can be engaged with the pile head of the ready-made pile 5, the yatco 7 or the pile suspension 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 force point A is located below the fulcrum F and the point of action E is the body portion 20. Is located outside the fulcrum F in the radial direction. In this state, the variable slide block 22 connected to the swing arm portion 34 at the point of action E is located outside in the radial direction of the body portion 20 as compared with the case of FIG. As described above, in the state (non-operating state) shown in FIG. 10, the amount of protrusion of the inner end side of the variable slide block 22 toward the inside of the body portion 20 in the radial direction of the body portion 20 is small, and the object to be grasped is small. The engagement of the pile head of a certain ready-made pile 5, the yatco 7 or the pile suspension device is released.

According to the above configuration, since the force point A at which the driving force of the drive cylinder 24 is input to the crank arm portion 32 is located inside the fulcrum F in the radial direction of the body portion 20, the drive cylinder 24 is not It may be located near the section 20. As a result, the chucking device 1 can be downsized in the radial direction of the body portion 20.

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

According to the above configuration, by connecting the drive cylinder 24 and the crank arm portion 32 via the connecting rod portion 40, it is possible to secure a distance between the drive cylinder 24 and the crank arm portion 32. As a result, the force point A can be arranged closer to the body portion 20 than the fulcrum F while avoiding the interference of the crank arm portion 32 and the drive cylinder 24 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. A space corresponding to the columnar portion 40c is provided between the two plates 40a and 40b. The two plates 40a and 40b have a P-shaped contour shape in a plan view, and the upper portion is larger 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 in this state, the pin 42 is inserted into the tip of the cylinder rod 38 and the plates 40a and 40b. Note that, 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 has an oval shape or an oval shape in plan view. One end of the crank arm portion 32 is sandwiched between the lower portions of the plates 40a and 40b, and in this state, the 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 in parallel with the pin 42 and constitutes a force point A to which the driving force of the driving cylinder 24 is input to the crank arm portion 32. Note that, for example, both ends of the pin 44 are rigidly joined to the lower ends of the plates 40a and 40b by welding, and the crank arm portion 32 is rotatable relative to the pin 44.
Preferably, the pin 44 is located closer to the body 20 than the pin 42 in the radial direction of the body 20.

On the other hand, a pin 46 is fixed to the other end of the crank arm portion 32 in parallel with the pin 44. The pins 46 extend on both sides of the crank arm portion 32, and the upper end of the swing arm portion 34 is fixed to the tip of the pin 46. Therefore, the crank arm portion 32, the pin 46 and the swing arm portion 34 form 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 portion 20 so as to cover the lower end portions of the plates 40a and 40b and the crank arm portion 32. .. The pin 46 slidably penetrates both side walls of the bracket 48, and the bracket 46 rotatably supports the pin 46. That is, the pin 46 constitutes the fulcrum F.

The swing arm portion 34 is composed of a pair of plates 34 a and 34 b arranged in parallel with each other so as to sandwich the bracket 48. The tips of the pins 46 are fixed to the upper ends of the plates 34a and 34b, and the plates 34a and 34b can swing as the pins 46 rotate.
The lower ends of the pair of plates 34a and 34b are arranged on both sides of the variable slide block 22, and in this state, the pins 50 are inserted into the lower ends of the plates 34a and 34b and the variable slide block 22. Here, the pin holes 38c of the plates 34a and 34b through which the pins 50 are inserted have an oval shape in order to allow the pins 50 to move in the vertical direction when the swing arm portion 34 swings. ..
The pins 42, 44, 46, 50 are all arranged parallel to the tangential direction of the body portion 20.
Note that, for example, the pin 50 is formed of a bolt, and the pin 50 is prevented from coming off by attaching a washer and a removal stop 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, respectively. The pin 50 is inserted into one of the pin holes 52, but by selecting the pin hole 52, the amount of protrusion of the variable slide block 22 to the inside of the body portion 20 in the operating state or the non-operating state can be adjusted. is there.
For example, the chucking device 1 has a rectangular tube-shaped guide 54, and the guide 54 is attached to the body portion 20 so that its hollow portion communicates with the opening 28. The variable slide block 22 is inserted into a guide 54 and is movable while being guided by the guide 54. In addition, in order to allow the horizontal movement of the pin 50, oval guide holes 54a and 54b are provided on both side walls of the guide 54.
For example, the bracket 48 is disposed on the guide 54, and the bracket 48 and the guide 54 are welded to each other. Further, for example, the bracket 48 and the guide 54 are welded to the body portion 20. Further, 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 portion of the swing arm portion 34 substantially corresponds to the length of the guide 54 in the radial direction of the body portion 20.

Then, the sleeves 56a and 56b are fitted onto the pin 46, and the sleeves 56a and 56b allow 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 kept in aptitude.

Lastly, the present invention is not limited to the above-described embodiment, and includes a modified form of the above-described embodiment and a combination thereof.
For example, in the above-described embodiment, the cylinder tube 36 of the drive cylinder 24 is rigidly joined to the support column 30, but may be pin-joined. That is, the cylinder tube 36 may be swingable with respect to the column 30. In this case, the connecting rod part 40 and the drive cylinder 24 may be rigidly joined, or the connecting rod part 40 may be omitted and the drive cylinder 24 and the crank arm part 32 may be directly pin-joined.

1 Sucking device for soil discharging hopper of pile driver 3 Pile driver 5 Ready-made pile 7 Yatco 9 Soil 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 part 34 Swing arm part 34a, 34b Plate 34c Pin hole 36 Cylinder tube 38 Cylinder rod 40 Connecting rod part 40a, 40b Plate 40c Column part 42, 44, 46, 50 Pin 48 Bracket 52 Pin hole 54 Guide 54a , 54b Guide hole 55 Reinforcing plates 56a, 56b Sleeve A Force point F Support point E Action point

Claims (2)

A tubular body portion that can be integrated with or connected to the soil discharging hopper of the pile driver, and has a sideward opening,
A variable slide block slidably inserted into the opening along the horizontal direction,
A drive cylinder arranged along the axial direction of the body,
A link mechanism for transmitting the driving force of the drive cylinder to the variable slide block,
The link mechanism is
A crank arm portion capable of swinging around a fulcrum by the driving force of the drive cylinder;
A swing arm portion that is swingable around the fulcrum in conjunction with swing of the crank arm portion and that connects the variable slide block and the crank arm portion,
The force point at which the driving force of the drive cylinder is input to the crank arm portion is located inward of the fulcrum in the radial direction of the trunk portion. Chucking device. The link mechanism includes a connecting rod portion for connecting the drive cylinder and the crank arm portion,
The pile chucking device for a soil discharging hopper of a pile driver according to claim 1, wherein the connecting rod portion is pin-joined to the drive cylinder and the crank arm portion, respectively.

Images