A gripping aid for assisting the gripping of a material to be driven in with a vibro-hammer, and a method for gripping a material to be driven in with a vibro-hammer using the same.

Abstract

The pair of gripping claws on the vibro-hammer facilitate the process of gripping the pile to be driven into the ground. [Solution] When gripping the upper part of a pile 40 with a pair of gripping claws 31b, 31c of a vibro hammer 30 attached to a pile driving machine 20, a gripping assist device 10 is used, which includes a lifting means 11 that suspends and supports the pile 40 so that the upper part of the pile 40 is positioned between a pair of gripping claws 30b, 30c, and a moving means 13 that moves the lower part of the pile 40 laterally when the pile 40 is lifted by the lifting means 11 to change the position of the pile 40 from horizontal to vertical.

Description

Technical Field

[0001] The present invention relates to a gripping aid for assisting in gripping a driven member by a vibro hammer and a method for gripping a driven member by a vibro hammer using the same.

Background Art

[0002] In the vibro hammer method, prior to driving a driven member such as an H-beam or a steel sheet pile into the ground by a vibro hammer, the upper part of the driven member, which has been placed horizontally by another heavy machine and then turned vertically, is inserted between a pair of gripping claws of the vibro hammer supported at a high position by a heavy machine, and then the driven member is gripped by sandwiching it with the pair of gripping claws.

[0003] Regarding the vibro hammer, for example, it is described in Patent Document 1 that a through-pin is provided on one of the opposing surfaces of a pair of gripping claws of the vibro hammer, an insertion hole into which the through-pin can be inserted is provided on the other of the opposing surfaces, and a pin hole into which the through-pin can be inserted into a pile is provided.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, as described above, the operation of inserting a pile between a pair of gripping claws of the vibro hammer requires an operator to operate another heavy machine supporting the pile and align and insert the pile between the pair of gripping claws of the vibro hammer located at a high position. Therefore, proficiency is required for the alignment and confirmation, and it is a troublesome operation that requires time and labor.

[0006] Therefore, when driving multiple piles into the ground, the process of inserting each individual pile between the pair of gripping claws of the vibro-hammer significantly hinders the efficiency of pile driving.

[0007] Furthermore, at work sites where piles are gripped by the pair of gripping claws of a vibro-hammer, in addition to the heavy machinery that supports the vibro-hammer, heavy machinery that supports the piles is also deployed, resulting in a large-scale operation.

[0008] The present invention was made in light of the above-mentioned technical background, and aims to facilitate the operation of gripping the material to be driven in with a pair of gripping claws of a vibro-hammer.

[0009] Furthermore, the present invention aims to reduce the scale of the work involved in gripping the material to be driven in using a pair of gripping claws of a vibro-hammer. [Means for solving the problem]

[0010] To solve the above problems, the gripping aid for assisting the gripping of a material to be driven into the ground by a vibro-hammer according to claim 1 of the present invention is a gripping aid that assists in gripping a material to be driven into the ground by a vibro-hammer with a pair of gripping claws constituting the gripping part of the vibro-hammer, and is characterized by comprising: a lifting means for supporting the material to be driven in a suspended state such that the upper part of the material to be driven is located directly below the pair of gripping claws; and a moving means disposed below the lower part of the material to be driven, which moves the lower part of the material to be driven in a horizontal direction when the material to be driven is lifted by the lifting means to change the material to a vertical position.

[0011] The invention described in claim 2 is characterized in that, in the invention described in claim 1, the gripping portion comprises a base portion detachably provided on the lower surface of the vibration generating portion of the vibro-hammer by fastening means, a first gripping claw which is one of the pair of gripping claws and is fixed to the lower surface of the base portion, a second gripping claw which is the other of the pair of gripping claws and is fixed to the lower surface of the base portion and has a movable portion which moves in a direction toward and toward the first gripping claw, and a drive unit which moves the movable portion, the lifting means comprises a pair of lifting fittings provided on both sides of the base portion, and a pair of lifting members in each of the pair of lifting fittings whose upper ends are connected to the lifting fittings and whose lower ends are detachably connected to the material to be driven, and the moving means comprises a mounting base on which the lower part of the material to be driven is placed, and a wheel which is rotatably provided on the lower surface of the mounting base described above.

[0012] The invention described in claim 3 is characterized in that, in the invention described in claim 2, the pair of suspension members are positioned between the first gripping claw and the second gripping claw when viewed from the side of the base.

[0013] The invention described in claim 4 is characterized in that, in the invention described in claim 2, the pair of suspension fittings are detachably attached to the base by the fastening means.

[0014] The invention described in claim 5 is characterized in that, in the invention described in any one of claims 1 to 4, a guide portion for guiding the material to be driven between the pair of gripping claws is provided on the lower surface of at least one of the pair of gripping claws.

[0015] A method for gripping a material to be driven using a vibro-hammer with the gripping aid of the present invention as described in claim 6, comprising the steps of: connecting the upper part of the material to be driven in a horizontal position to the gripping part of the vibro-hammer by a suspension means and installing a moving means below the lower part of the material to be driven; raising the vibro-hammer to lift the material to be driven by the suspension means and moving the lower part of the material to be driven laterally by the moving means to change the material to be driven from a horizontal position to a vertical position; removing the moving means after the material to be driven is in a vertical position; and after the moving means has been removed, lowering the vibro-hammer and inserting the upper part of the material to be driven between a pair of gripping claws constituting the gripping part, thereby gripping the material to be driven with the pair of gripping claws.

[0016] The invention described in claim 7 is characterized in that, in the invention described in claim 6, the gripping portion comprises a base portion detachably provided on the lower surface of the vibration generating portion of the vibro-hammer by fastening means, a first gripping claw which is one of a pair of gripping claws and is fixed to the lower surface of the base portion, a second gripping claw which is the other of the pair of gripping claws and is fixed to the lower surface of the base portion and has a movable portion which moves in a direction toward and toward the first gripping claw, and a drive unit which moves the movable portion, the lifting means comprises a pair of lifting fittings provided on both sides of the base portion, and a pair of lifting members in each of the pair of lifting fittings, the upper end of which is connected to the lifting fitting and the lower end of which is detachably connected to the material to be driven, and the moving means comprises a mounting base on which the lower part of the material to be driven rests, and a wheel which is rotatably provided on the lower surface of the mounting base described above.

[0017] The invention described in claim 8 is characterized in that, in the invention described in claim 7, the pair of suspension members are positioned between the first gripping claw and the second gripping claw when viewed from the side of the base.

[0018] The invention according to claim 9 is characterized in that, in the invention according to claim 7, the pair of hanging brackets are detachably attached to the base by the fastening means.

[0019] The invention according to claim 10 is characterized in that, in the invention according to any one of claims 6 to 9, a guide portion for guiding the driven material is provided on at least one lower surface of the pair of gripping claws between the pair of gripping claws.

Advantages of the Invention

[0020] According to the present invention, it becomes possible to facilitate the operation of gripping the driven material with the pair of gripping claws of the vibro hammer.

[0021] Further, according to the present invention, it becomes possible to reduce the scale of the operation of gripping the driven material with the pair of gripping claws of the vibro hammer.

Brief Description of the Drawings

[0022] [Figure 1] It is a side view of an example of a pile driver using a gripping aid according to an embodiment of the present invention. [Figure 2] It is a perspective view of the pile driver of FIG. 1. [Figure 3] It is a perspective view of the pile driver of FIG. 1. [[ID=3l]] [Figure 4] It is a side view of the pile driver of FIG. 1. [Figure 5] (a) to (c) are side views of the pile driver during the operation of the arm portion. [Figure 6] It is a side view of the vibro hammer. [Figure 7] It is an enlarged front view of the main part of the gripping portion of the vibro hammer of FIG. 6. [Figure 8] It is a perspective view of the gripping portion of FIG. 7 as viewed obliquely downward from the back side. [Figure 9] It is a perspective view of the gripping portion of FIG. 7 as viewed obliquely upward from the back side. [Figure 10] It is a plan view of the gripping portion of FIG. 9 as viewed from above. [Figure 11]Figure 9 is a side view of the gripping section. [Figure 12] (a) is a front view of the gripping part in Figure 9, and (b) is a rear view of the gripping part in Figure 9. [Figure 13] This is a perspective view of the suspension fittings that constitute the suspension mechanism. [Figure 14] Figure 13 is a top view of the suspension fitting. [Figure 15] This is a perspective view of an example configuration of the moving means that constitutes the suspension system. [Figure 16] This is a side view of the pile driver and the pile. [Figure 17] Figure 16 is an enlarged perspective view of the main parts of the vibro-hammer and pile. [Figure 18] This is a side view of the pile driver and pile during the process, following Figure 16. [Figure 19] Figure 18 is an enlarged perspective view of the main parts of the vibro-hammer and pile. [Figure 20] This is a side view of the pile driver and pile during the process, following Figure 18. [Figure 21] Figure 20 is an enlarged perspective view of the main parts of the vibro-hammer and pile. [Figure 22] This is a side view of the pile driver and pile during the process, following Figure 20. [Figure 23] This is a side view of the pile driver and pile during the process, following Figure 22. [Figure 24] Figure 23 is an enlarged perspective view of the main parts of the vibro-hammer and pile. [Figure 25] Figure 24 is a magnified perspective view of the vibro-hammer and key parts of the pile during the process. [Figure 26] This is a side view of the pile driver and pile during the process, following Figure 25. [Modes for carrying out the invention]

[0023] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the drawings used to illustrate the embodiments, the same reference numerals are generally used for identical components, and repeated descriptions of such components will be omitted.

[0024] Figure 1 is a side view of an example of a pile driver using the gripping aid of this embodiment.

[0025] The gripping aid 10 of this embodiment is a tool that assists in the gripping operation when the gripping portion 31 of the vibro-hammer 30 attached to the pile driving machine 20 grips the pile (material to be driven) 40, and comprises a lifting means 11, a guide portion 12, and a moving means 13.

[0026] Figures 2 and 3 are perspective views of the pile driver shown in Figure 1, and Figure 4 is a side view of the pile driver shown in Figure 1. Note that Figure 2 shows the state when the vibro-hammer 30 is raised until the pile 40 is in a vertical position, Figure 3 shows the state when the vibro-hammer 30 is lowered to its lowest position, and Figure 4 omits the pile 40.

[0027] As shown in Figures 2 to 4, the pile driver 20 is a heavy machine that carries the pile 40, which is gripped by the gripping part 31 of the vibro hammer 30, to the pile driving site and drives it into the ground. A crawler section 22 is provided at the lower part of the pile driving body 21 of the pile driver 20, which allows the pile driver 20 to travel laterally along the ground.

[0028] Furthermore, an arm section 23 is provided on the front of the pile driving body 21 of the pile driving machine 20. The arm section 23 comprises an arm cylinder section 23a, a mast tilt adjustment cylinder section 23b, and a pantograph section 23c. This arm section 23 makes it possible to lift and lower the vibro hammer 30. The arm section 23 is driven, for example, by hydraulics.

[0029] The lower mast 24a and the upper mast 24b are supported at the tip of this arm section 23. Both the lower mast 24a and the upper mast 24b extend in a band shape along the vertical direction and are installed in a state where they are engaged with each other. A mast foot 24c is attached to the lower end surface of the lower mast 24a.

[0030] A vibro-hammer 30 is engaged with the upper mast 24b in a manner that allows it to move up and down along the extending direction of the upper mast 24b. An assist winch 25 is also installed on the upper end surface of the upper mast 24b to assist in the up and down movement of the vibro-hammer 30.

[0031] A counterweight 26 is attached to the back of the pile driving body 21 of the pile driving machine 20. An outrigger 27 is installed below the counterweight 26 to prevent the pile driving machine 20 from tipping over.

[0032] Figures 5(a) to 5(c) are side views of the pile driver during the operation of the arm section.

[0033] As shown in Figure 5(a), the pile driver 20 can move its arm 23 from a state where it is extended almost horizontally along the ground, to a state where the tip of the arm 23 is moved away from the ground, as shown in Figure 5(b), and further to a state where the arm 23 is extended almost vertically to the ground, as shown in Figure 5(c). The reverse movement from Figure 5(c) to Figure 5(a) is also possible. These movements make it possible to change the height of the vibro-hammer 30.

[0034] Next, an example configuration of the vibro-hammer 30 will be explained with reference to Figures 6 to 12.

[0035] Figure 6 is a side view of the vibro-hammer, Figure 7 is an enlarged front view of the main part of the gripping section of the vibro-hammer in Figure 6, Figure 8 is a perspective view of the gripping section in Figure 7 seen from the rear side at an angle below, Figure 9 is a perspective view of the gripping section in Figure 7 seen from the rear side at an angle above, Figure 10 is a top view of the gripping section in Figure 9 seen from above, Figure 11 is a side view of the gripping section in Figure 9, Figure 12(a) is a front view of the gripping section in Figure 9, and Figure 12(b) is a rear view of the gripping section in Figure 9. Note that Figures 6 and 7 show the stage in which the pile 40 is suspended and supported below the gripping section 31.

[0036] As shown in Figure 6, the vibro-hammer 30 is a device that drives a pile 40 into the ground by vibrating it up and down, thereby transmitting vibrations generated by the vibration-generating part (vibration generating part) 32 to the pile 40 gripped by the gripping part 31 via the gripping part 31 at the bottom of the vibration-generating part 32.

[0037] The vibration generator 32 is a device that generates vertical force by rotating a pair of eccentric weights (not shown) in opposite directions in the same phase using a drive unit (not shown) of the vibro-hammer 30. The drive unit (not shown) that drives the vibration generator 32 comprises, for example, an electric or hydraulic motor and a control unit that controls the operation of the motor. A buffer unit (not shown) is provided between the vibration generator 32 and its drive unit and the upper mast 24b (see Figures 2 to 4, etc.) to prevent vibration forces from being transmitted to the upper mast 24b.

[0038] A gripping section 31 is installed on the lower surface of the vibration generating section 32. As shown in Figures 6 to 12, the gripping section 31 is a device for gripping the pile 40 and comprises a base section 31a, a first gripping claw (one of a pair of gripping claws) 31b, a second gripping claw (the other of a pair of gripping claws) 31c, and a drive section 31d.

[0039] As shown in Figures 6 and 7, the pile 40 is made of steel, such as an H-shaped steel, and has a flange portion 40f (see Figure 6) and a web portion 40w (see Figure 7) perpendicular to it.

[0040] As shown in Figures 6 to 9, recesses 31ar are provided on both sides of the base portion 31a that constitutes the gripping portion 31, extending from the front to the back of the gripping portion 31, and a flange portion 31af is formed on the upper part of the base portion 31a by these recesses 31ar.

[0041] As shown in Figures 9 and 10, the flange portion 31af formed on the base portion 31a has a plurality of bolt holes 31ah drilled at predetermined intervals along the side surface of the base portion 31a, penetrating the upper and lower surfaces of the flange portion 31af.

[0042] As shown in Figure 8, the gripping portion 31 is detachably attached to the lower surface of the vibrating portion 32 by a fastening means consisting of a bolt 31t with a male threaded portion (not shown) screwed through a bolt hole 31ah (see Figures 9 and 10) into a female threaded portion formed on the lower surface of the vibrating portion 32. This allows the gripping portion 31 to be replaced when it breaks or when it is desired to change the type of gripping portion 31.

[0043] Note that the fastening means shown in this embodiment is just one example, and the structure may differ from that of this embodiment as long as it is a fastening means that can detachably attach the gripping portion 31 to the lower surface of the vibration generating portion 32.

[0044] As shown in Figures 6, 8, 9, and 11, a first gripping claw 31b and a second gripping claw 31c are fixed to the lower part of the base 31a, spaced apart from each other. The first gripping claw 31b and the second gripping claw 31c are integrally formed with the base 31a.

[0045] As shown in Figures 6, 7, 9, 11, and 12, a guide portion 12, which constitutes the gripping aid 10 described above, is joined to the lower part of the first gripping claw 31b. The guide portion 12 is made of, for example, steel.

[0046] This guide section 12 is a member that stops the pile 40 from swinging in the direction of the upper mast 24b (see Figures 2 to 4) (to the right in Figure 6), and guides the pile 40 so that it is positioned directly below the space between the first gripping claw 31b and the second gripping claw 31c.

[0047] As shown in Figures 6 and 11, the front surface of the guide section 12 has an inclined surface that gradually moves away from the second gripping claw 31c downwards, in order to guide the pile 40 between the first gripping claw 31b and the second gripping claw 31c.

[0048] By providing a guide portion 12 of this shape, the pile 40 can be guided to be positioned between the first gripping claw 31b and the second gripping claw 31c, making it easy to insert the upper part of the pile 40 between the first gripping claw 31b and the second gripping claw 31c.

[0049] As shown in Figures 6, 9, and 11, the second gripping claw 31c includes a movable part 31cm that moves toward and away from the first gripping claw 31b, and a drive unit 31d that drives this movable part 31cm. This drive unit 31d is configured, for example, by an electric or hydraulic motor.

[0050] Next, an example of the configuration of the suspension means 11 that constitutes the gripping aid 10 described above will be explained with reference to Figures 6 to 14. Figure 13 is a perspective view of the suspension fitting that constitutes the suspension means, and Figure 14 is a plan view of the suspension fitting of Figure 13 seen from above.

[0051] As shown in Figures 7 and 12, the lifting means 11 is a means for supporting the pile 40 in a suspended state directly below the gripping portion 31, and is installed symmetrically on both sides of the gripping portion 31. This allows the pile 40 to be lifted in a stable state.

[0052] As shown in Figure 7, this suspension means 11 comprises a pair of suspension fittings 11a, a pair of adjustable eye bolts 11b, a pair of wires (suspension members) 11c, and a pair of adjustable eye bolts 11d.

[0053] The suspension fitting 11a is formed in a T-shape in a side view, as shown in Figure 11, by processing, for example, an H-shaped steel beam. The suspension fitting 11a has a flange portion 11af and a web portion 11aw perpendicular to it, as shown in Figures 13 and 14.

[0054] As shown in Figures 13 and 14, the flange portion 11af of the suspension fitting 11a has a first side 11a1, a second side 11a2 opposite to the first side 11a1, and a third side 11a3 and a fourth side 11a4 that are perpendicular to the first side 11a1 and the second side 11a2.

[0055] In the flange portion 11af of the suspension fitting 11a, a recess 11ar is formed in the center of the first side 11a1, which is recessed toward the in-plane center of the suspension fitting 11a. Furthermore, bolt holes 11a5 are drilled on both the left and right sides of the recess 11ar in the flange portion 11af of the suspension fitting 11a, penetrating the upper and lower surfaces of the flange portion 11af.

[0056] Furthermore, a bolt hole 11a6 for inserting a swivel eyebolt 11b is drilled near the second side 11a2 in the flange portion 11af of the suspension fitting 11a. The position of this bolt hole 11a6 is offset from the center between the third side 11a3 and the fourth side 11a4 so as not to overlap with the web portion 11aw.

[0057] Furthermore, the bolt holes 11a6, 11a6 in the pair of left and right suspension fittings 11a, 11a are arranged so as to be symmetrical. This allows the surface of the web portion 40w of the pile 40 (see Figure 7, etc.) to be kept almost horizontal with respect to the opposing surfaces of the first gripping claw 31b and the second gripping claw 31c of the gripping portion 31 shown in Figure 6, etc., so that the upper part of the web portion 40w of the pile 40 can be easily inserted between the gripping claw 31b and the second gripping claw 31c.

[0058] The web portion 11aw of the suspension fitting 11a is provided between the third side 11a3 and the fourth side 11a4, perpendicular to the first side 11a1 and the second side 11a2.

[0059] As shown in Figure 13, in this flange portion 11af, a notch 11an is formed on the upper part of the suspension fitting 11a that is exposed from the recess 11ar of the flange portion 11af, and is partially cut out slightly lower than the rest of the upper part.

[0060] As shown in Figures 6, 8, and 11, the suspension fitting 11a is fitted into the recess 31ar of the gripping portion 31 so as to form a T shape in side view. The bolt hole 11a5 of the suspension fitting 11a (see Figure 14, etc.) and the bolt hole 31ah of the base portion 31a of the gripping portion 31 (see Figure 10, etc.) are superimposed in plan, and as shown in Figure 8, the male threaded portion of the bolt 31t that fixes the base portion 31a to the vibration exciter 32 is screwed into the female threaded portion on the lower surface of the vibration exciter 32 via the respective bolt holes 11a5 and 31ah. In this way, the suspension fitting 11a is fixed to the base portion 31a of the gripping portion 31 in a detachable manner.

[0061] As shown in Figures 13 and 14, a recess 11ar is formed in the first side 11a1 of the suspension fitting 11a, and a notch 11an is formed in the upper part of the web portion 11aw that is exposed from the recess 11ar. As shown in Figure 8, when the suspension fitting 11a is fitted into the recess 31ar of the base portion 31a that constitutes the gripping portion 31, the first side 11a1 and the upper part of the web portion 11aw of the suspension fitting 11a do not collide with the head of the bolt 31t that connects the base portion 31a and the vibration exciter 32. This allows the suspension fitting 11a to be fitted to a position where the bolt hole 11a5 of the suspension fitting 11a and the bolt hole 31ah of the base portion 31a coincide.

[0062] Here, the suspension fitting 11a can also be joined to the base 31a of the gripping part 31 by welding or the like, but in that case, the fixing strength of the suspension fitting 11a will be weakened. Also, if the suspension fitting 11a breaks, the entire gripping part 31 must be replaced.

[0063] In contrast, in this embodiment, the fixing strength of the suspension fitting 11a can be increased by fixing the suspension fitting 11a to the gripping part 31 using a base fixing bolt 31t. Furthermore, by making the suspension fitting 11a detachable, the suspension fitting 11a can be replaced when it breaks or for other reasons.

[0064] Furthermore, as shown in Figures 7 to 10 and Figure 12, the suspension fitting 11a is installed with a portion of the flange portion 11af protruding from the side surface of the base portion 31a of the gripping portion 31. As shown in Figure 10, bolt holes 11a6 are provided in the protruding portion of the flange portion 11af of the suspension fitting 11a.

[0065] As shown in Figures 7, 9, 11, and 12, a swivel eyebolt 11b is attached to the bolt hole 11a6 of the suspension fitting 11a. The swivel eyebolt 11b has a ring portion 11br, a male threaded portion 11bs formed integrally with the ring portion 11br, and a nut 11bn screwed onto the male threaded portion 11bs.

[0066] The adjustable eyebolt 11b is attached to the suspension fitting 11a in a detachable manner by inserting its male threaded portion 11bs into the bolt hole 11a6 from the lower surface of the flange portion 11af of the suspension fitting 11a with its ring portion 11br facing downwards, and then screwing a nut 11bn onto the male threaded portion 11bs protruding from the bolt hole 11a6.

[0067] In the illustration, nut 11bn is shown as a double nut, using two nuts (one above and one below) to prevent the screw from rotating backward, thus ensuring that loosening is reliably prevented. However, it may also be a single nut.

[0068] On the other hand, as shown in Figures 6 and 7, a swivel eyebolt 11d is also attached to the flange portion 40f of the pile 40. This swivel eyebolt 11d also has a ring portion 11dr, a male threaded portion 11ds integrally formed on the ring portion 11dr, and a nut 11dn screwed onto the male threaded portion 11ds.

[0069] The adjustable eyebolt 11d is attached to the pile 40 in a detachable manner by inserting its male threaded portion 11ds into a bolt hole (not shown) from the outer surface of the flange portion 40f of the pile 40 with its ring portion 11dr facing sideways, and then screwing a nut 11dn onto the male threaded portion 11ds protruding from the bolt hole.

[0070] Furthermore, as shown in Figure 7, the positions of the left and right adjustable eye bolts 11d, 11d are arranged symmetrically. This allows the pile 40 to be lifted in a stable state. In addition, the surface of the web portion 40w of the pile 40 (see Figure 7, etc.) can be kept almost horizontal with respect to the opposing surfaces of the first gripping claw 31b and the second gripping claw 31c of the gripping portion 31 shown in Figure 6, etc., so the upper part of the web portion 40w of the pile 40 can be easily inserted between the gripping claw 31b and the second gripping claw 31c.

[0071] As shown in Figures 6, 7, 9, 11, and 12, the upper end of the wire 11c is connected to the ring portion 11br of the adjustable eyebolt 11b attached to the suspension fitting 11a. On the other hand, as shown in Figures 6 and 7, the lower end of the wire 11c is connected to the ring portion 11dr of the adjustable eyebolt 11d attached to the pile 40.

[0072] In this embodiment, as shown in Figures 6 and 11, the position of the wire 11c is set to be located between the first gripping claw 31b and the second gripping claw 31c of the gripping part 31. As a result, as shown in Figure 6, when the pile 40 is lifted, the upper part of the web portion 40w of the pile 40 can be positioned self-aligned between the first gripping claw 31b and the second gripping claw 31c of the gripping part 31. Therefore, the operation of inserting the upper part of the web portion 40w of the pile 40 between the first gripping claw 31b and the second gripping claw 31c of the gripping part 31 can be easily performed.

[0073] Next, an example of the configuration of the moving means 13 that constitutes the gripping aid 10 described above will be explained with reference to Figure 15. Figure 15 is a perspective view of an example of the configuration of the moving means that constitutes the suspension means.

[0074] The moving means 13 is a means for moving the lower part of the stake 40 laterally along the ground when changing the stake 40 from a horizontal position to a vertical position, and as shown in Figure 15, it is composed of, for example, a six-wheeled trolley.

[0075] The moving means 13 is equipped with two wheel mounting sections 13a, 13a that are spaced apart from each other and arranged parallel to each other. These two wheel mounting sections 13a, 13a are made of, for example, channel steel, and are installed with their respective grooves facing upwards.

[0076] On the underside (the side facing the ground) of each of these wheel mounting sections 13a, 13a, for example, three wheels 13b are arranged along the longitudinal direction of the wheel mounting sections 13a, 13a, and each is mounted in a manner that allows it to rotate freely.

[0077] Furthermore, between these two wheel mounting sections 13a, 13a, two pile mounting bases (mounting bases) 13c, 13c are installed perpendicular to the wheel mounting section 13a, with the bases spaced apart from each other and arranged parallel to one another.

[0078] These two pile support bases 13c, 13c are the base portions on which the lower part of the pile 40 is placed. These two pile support bases 13c, 13c are formed, for example, from channel steel, and are installed with their respective grooves facing downwards. A handle 13d is attached to one of the two pile support bases 13c.

[0079] Next, an example of a gripping method in which the gripping auxiliary tool 10 of this embodiment is used to grip the pile 40 with the gripping portion 31 of the vibro hammer 30 of the pile driving machine 20 will be described with reference to Figures 16 to 26.

[0080] Figure 16 is a side view of the pile driver and pile, and Figure 17 is an enlarged perspective view of the main parts of the vibro-hammer and pile in Figure 16.

[0081] First, as shown in Figure 16, the pile driver 20 is moved to a position where its vibro-hammer 30 is directly above the upper side (frame 50 side) of the pile 40, which is supported horizontally by the moving means 13 and the frame 50 (the pile 40 is almost horizontal to the ground). Then, the vibro-hammer 30 is lowered to near the upper side of the pile 40.

[0082] Next, as shown in Figure 17, a swivel eyebolt 11b is attached to the lifting fitting 11a mounted on the gripping portion 31 of the vibro-hammer 30, and a swivel eyebolt 11d is attached to the upper part of the pile 40.

[0083] At this time, one end of the wire 11c is already connected to the ring portion 11br of one of the adjustable eye bolts 11b, and the other end of the wire 11c is already connected to the ring portion 11dr of the other adjustable eye bolt 11d.

[0084] Next, Figure 18 is a side view of the pile driver and pile during the process following Figure 16, and Figure 19 is an enlarged perspective view of the main parts of the vibro-hammer and pile in Figure 18.

[0085] As shown in Figures 18 and 19, the vibro-hammer 30 is raised along the upper mast 24b to lift the pile 40 by the lifting means 11, and the moving means 13 is moved laterally along the ground to move the lower part of the pile 40 laterally toward the pile driver 20, thereby changing the pile 40 from a horizontal position to a vertical position.

[0086] As shown in Figure 19, when the vibro-hammer 30 begins to rise, the wire 11c becomes taut and begins to lift the pile 40.

[0087] Next, Figure 20 is a side view of the pile driver and pile during the process following Figure 18, and Figure 21 is an enlarged perspective view of the main parts of the vibro-hammer and pile in Figure 20.

[0088] As shown in Figure 20, the vibro-hammer 30 is raised until the pile 40 is in a vertical position (the pile 40 is almost perpendicular to the ground), at which point the rise of the vibro-hammer 30 is stopped.

[0089] At this time, as shown in Figure 21, the wire 11c is positioned between the first gripping claw 31b and the second gripping claw 31c of the gripping part 31, so the pile 40 can be supported while suspended directly below the space between the first gripping claw 31b and the second gripping claw 31c.

[0090] Furthermore, the guide section 12 can stop the pile 40 from swaying, and can also guide the pile 40 so that it is positioned directly below the space between the first gripping claw 31b and the second gripping claw 31c.

[0091] Next, Figure 22 is a side view of the pile driver and pile during the process following Figure 20. The enlarged perspective view of the main parts of the vibro-hammer and pile in Figure 22 is the same as in Figure 21, so it is omitted from the illustration.

[0092] Here, as shown in Figure 22, the moving mechanism 13 (see Figure 20) located below the lower end of the pile 40 is removed.

[0093] Next, Figure 23 is a side view of the pile driver and pile during the process following Figure 22, and Figure 24 is an enlarged perspective view of the main parts of the vibro-hammer and pile in Figure 23.

[0094] As shown in Figure 23, by lowering the vibro-hammer 30 along the upper mast 24b, the web portion 40w of the pile 40 is inserted between the first gripping claw 31b and the second gripping claw 31c of the gripping portion 31 of the vibro-hammer 30, as shown in Figure 24.

[0095] Next, Figure 25 is an enlarged perspective view of the main parts of the vibro-hammer and pile during the process following Figure 24.

[0096] As shown in Figure 25, with the web portion 40w of the pile 40 inserted between the first gripping claw 31b and the second gripping claw 31c of the gripping portion 31 of the vibro-hammer 30, the movable portion 31cm of the second gripping claw 31c is moved toward the first gripping claw 31b, thereby gripping the pile 40 with the movable portion 31cm of the second gripping claw 31c and the first gripping claw 31b.

[0097] Next, Figure 26 is a side view of the pile driver and pile during the process following Figure 25.

[0098] As shown in Figure 26, the vibro-hammer 30 is raised along the upper mast 24b while gripping the pile 40 with its gripping portion 31, and the rise of the vibro-hammer 30 is stopped when the lower part of the pile 40 is a predetermined height above the ground. Then, while the pile 40 is still gripped by the gripping portion 31 of the vibro-hammer 30, the pile driver 20 is driven to transport the pile 40 to the pile driving site.

[0099] Incidentally, according to the technology that the inventor considered for comparison, the process of inserting a pile between the pair of gripping claws of a vibro-hammer is a troublesome task that requires skill, time, and effort, as it involves aligning and inserting the pile between the pair of gripping claws of the vibro-hammer, which is located at a high position, using another heavy machine that supports the pile.

[0100] Therefore, when driving multiple piles into the ground, the process of inserting each individual pile between the pair of gripping claws of the vibro-hammer significantly hinders the efficiency of pile driving.

[0101] Furthermore, at work sites where piles are gripped by the pair of gripping claws of a vibro-hammer, in addition to the heavy machinery that supports the vibro-hammer, heavy machinery that supports the piles is also deployed, resulting in a large-scale operation.

[0102] In contrast, in this embodiment, when gripping the pile 40 with the gripping portion 31 of the vibro-hammer 30, instead of using other heavy machinery to position the pile 40 between the first gripping claw 31b and the second gripping claw 31c of the gripping portion 31, the pile 40 is lifted by the lifting means 11, allowing the pile 40 to be positioned self-aligned directly below the space between the first gripping claw 31b and the second gripping claw 31c.

[0103] Therefore, the web portion 40w of the pile 40 can be inserted between the first gripping claw 31b and the second gripping claw 31c without having to perform the work of aligning the pile 40 between the first gripping claw 31b and the second gripping claw 31c or confirming its position. This makes it easier to insert the pile 40 between the first gripping claw 31b and the second gripping claw 31c even if the vibro-hammer 30 is located at a high position.

[0104] Therefore, the operation of gripping the pile 40 with the first gripping claw 31b and the second gripping claw 31c of the gripping portion 31 of the vibro-hammer 30 can be made easier. Furthermore, since the operation of gripping the pile 40 can be made easier, the efficiency of driving the piles 40 into the ground can be improved.

[0105] Furthermore, as explained in Figure 23, when the vibro-hammer 30 is lowered to insert the pile 40 between the first gripping claw 31b and the second gripping claw 31c of the gripping section 31 of the vibro-hammer 30, the pile 40 may sway slightly because it is suspended by the wire 11c.

[0106] In this embodiment, even if the pile 40 sways slightly, the guide portion 12 can suppress the swaying of the pile 40, and can also guide the pile 40 so that it is positioned between the first gripping claw 31b and the second gripping claw 31c.

[0107] Therefore, the pile 40 can be more securely positioned between the first gripping claw 31b and the second gripping claw 31c, making it easier to insert the pile 40 between the first gripping claw 31b and the second gripping claw 31c, and facilitating the operation of gripping the pile 40 with the first gripping claw 31b and the second gripping claw 31c of the gripping portion 31 of the vibro-hammer 30.

[0108] Furthermore, since no heavy machinery is used to support the pile 40 in addition to the heavy machinery supporting the vibro-hammer 30, the work of gripping the pile 40 with the first gripping claws 31b and the second gripping claws 31c of the gripping section 31 of the vibro-hammer 30 can be reduced to a small scale.

[0109] Although the invention made by the present inventors has been specifically described above based on embodiments, the embodiments disclosed herein are illustrative in all respects and are not limited to the disclosed art. That is, the technical scope of the present invention should not be interpreted restrictively based on the description in the embodiments above, but rather should be interpreted in accordance with the claims, and includes art equivalent to the art described in the claims and all modifications that do not depart from the gist of the claims.

[0110] For example, the vibro-hammer may be supported by a crane or a hydraulic excavator.

[0111] Furthermore, instead of wires or chains, the suspension members that make up the lifting mechanism can be replaced with, for example, sling tapes. [Industrial applicability]

[0112] The above description shows the application of the gripping aid of the present invention to a pile driving machine that drives piles (materials to be driven) such as H-shaped steel into the ground. However, it can be applied to various driving machines, such as driving machines that drive earth retaining wall materials (materials to be driven) made of steel sheet piles or concrete sheet piles into the ground. [Explanation of Symbols]

[0113] 11bn nut 11c Wire (Suspension component) 11d Adjustable eye bolt 11dr ring section 11ds male thread part 11dn nut 12 Guide section 13 Means of Transportation 13a Wheel installation part 13b Wheel 13c Stake mounting platform (mounting platform) 13d Handle 20 Pile driver 21 Pile driving body 22 Crawler section 23 Arm section 23a Arm cylinder section 23b Mast tilt adjustment cylinder section 23c Pantograph section 24a Lower mast 24b Upper mast 24c Mastfoot 25 Assist Winch 26 Counterweights 27 Outriggers 30 Vibro-hammer 31 Gripping part 31a base 31ar recess 31af flange section 31ah bolt hole 31b First gripping claw (one of a pair of gripping claws) 31c Second gripping claw (the other of the pair of gripping claws) 31d Drive unit 31t bolt 31cm moving part 32. Vibration generating section (vibration generating part) 40 Pile (material to be driven) 40f flange section 40w Web Department 50 mounting bases

Claims

1. A gripping aid that assists in gripping a material to be driven into the ground by a vibro-hammer using a pair of gripping claws that constitute the gripping part of the vibro-hammer, A suspension means for supporting the material to be driven in a suspended state such that the upper part of the material to be driven is positioned directly below the pair of gripping claws, A moving means positioned below the lower part of the material to be driven, which moves the lower part of the material to be driven in the horizontal direction when the material to be driven is lifted by the lifting means in order to change the material to be driven from a horizontal position to a vertical position, A gripping aid that assists in gripping a material to be driven in by a vibro-hammer, characterized by having the following features.

2. The gripping portion is, A base is provided on the lower surface of the vibration generating part of the vibro-hammer in a manner that allows it to be detachably attached by fastening means, One of the pair of gripping claws, the first gripping claw fixed to the lower surface of the base, A second gripping claw, the other of the pair of gripping claws, is fixed to the lower surface of the base and has a movable part that moves in a direction toward and toward the first gripping claw, A drive unit for moving the aforementioned movable part, Equipped with, The aforementioned suspension means is A pair of suspension fittings provided on both sides of the base, Each of the pair of suspension fittings has a pair of suspension members, the upper end of which is connected to the suspension fitting and the lower end of which is detachably connected to the material to be driven in, Equipped with, The aforementioned means of transport is A support platform on which the lower part of the material to be driven into the ground is placed, A wheel is provided on the lower surface of the aforementioned mounting platform in a manner that allows it to rotate, Equipped with, A gripping aid for assisting the gripping of a material to be driven by a vibro-hammer as described in claim 1.

3. The pair of suspension members are positioned between the first gripping claw and the second gripping claw when viewed from the side of the base. A gripping aid for assisting the gripping of a material to be driven by a vibro-hammer, as described in feature 2.

4. The pair of suspension fittings are detachably attached to the base by the fastening means. A gripping aid for assisting the gripping of a material to be driven by a vibro-hammer, as described in feature 2.

5. A guide portion is provided on the lower surface of at least one of the pair of gripping claws to guide the material to be driven between the pair of gripping claws. A gripping aid for assisting the gripping of a material to be driven by a vibro-hammer as described in any one of claims 1 to 4.

6. The process involves connecting the upper part of the material to be driven in while it is placed horizontally to the gripping part of the vibro-hammer using a suspension means, and installing a moving means below the lower part of the material to be driven, The process involves raising the vibro-hammer to lift the material to be driven by the lifting means, and moving the lower part of the material to be driven laterally by the moving means to change the material to be driven from a horizontal position to a vertical position, The process involves removing the moving means after the material to be driven into the ground is placed in an upright position, After the removal of the aforementioned moving means, the vibro-hammer is lowered, the upper part of the material to be driven is inserted between the pair of gripping claws constituting the gripping portion, and the material to be driven is gripped by the pair of gripping claws. A method for gripping a material to be driven using a vibro-hammer with a gripping aid characterized by having the following features.

7. The gripping portion is, A base is provided on the lower surface of the vibration generating part of the vibro-hammer in a manner that allows it to be detachably attached by fastening means, One of the pair of gripping claws, the first gripping claw fixed to the lower surface of the base, A second gripping claw, the other of the pair of gripping claws, is fixed to the lower surface of the base and has a movable part that moves in a direction toward and toward the first gripping claw, A drive unit for moving the aforementioned movable part, Equipped with, The aforementioned suspension means is A pair of suspension fittings provided on both sides of the base, Each of the pair of suspension fittings has a pair of suspension members, the upper end of which is connected to the suspension fitting and the lower end of which is detachably connected to the material to be driven in, Equipped with, The aforementioned means of transport is A support platform on which the lower part of the material to be driven into the ground is placed, A wheel is provided on the lower surface of the aforementioned mounting platform in a manner that allows it to rotate, Equipped with, A method for gripping a material to be driven using a vibro-hammer with the gripping aid described in feature 6.

8. The pair of suspension members are positioned between the first gripping claw and the second gripping claw when viewed from the side of the base. A method for gripping a material to be driven using a vibro-hammer with the gripping aid described in item 7.

9. The pair of suspension fittings are detachably attached to the base by the fastening means. A method for gripping a material to be driven using a vibro-hammer with the gripping aid described in item 7.

10. A guide portion is provided on the lower surface of at least one of the pair of gripping claws to guide the material to be driven between the pair of gripping claws. A method for gripping a material to be driven using a vibro-hammer with a gripping aid as described in any one of claims 6 to 9.

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