JP2733494B2 - Attachment structure of claw members to hold the pile - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a claw member (also referred to as a tooth) for a device for chucking a pile in order to drive or pull the pile into the ground during construction work. ).

[Conventional technology]

The chuck device generally has a base attached to an exciter or a hydraulic device, and a fixed holding member and a movable holding member are mounted on the base, and the movable holding member is directed toward the fixed holding member. A driving unit is provided for pressing and holding the pile.

When the pile is gripped by the movable holding member and the fixed holding member, a portion directly in contact with the pile is easily damaged by a large pressing force or a frictional force. A member (also called a tooth, also called a chucking plate) is attached.

Prior to describing the mounting structure of the claw member, the general structure of a pile driving (including pile removing) device provided with a chuck device will be described with reference to FIGS.

FIG. 4 is a front view showing an example of a vibratory pile driver having a chuck device.

The exciter V is generally suspended by a pile driving crane. A chuck section C is mounted below the vibration section V.

Reference numeral 1 denotes a base, on the other hand, a mounting body 2 and a solid holding member 3
Are fixedly installed.

The movable holding member 4 is reciprocated by the reciprocating arrow D with respect to the mounting body 2 described above.
It is driven forward and backward in the direction, so that the pile P can be pinched and released via a pair of chuck claws 6, 6 '.

FIG. 5 shows a conventional example of a chuck device different from the above,
FIG. 6 is a sectional view thereof.

FIGS. 5 and 6 show a conventional example in which a pair of mounting bodies 2 and 1
It has a pair of fixed holding members, and holds two heads of the steel pipe pile P.

In the figure, reference numeral 1 denotes a base, the base 1 includes a disk-shaped top plate 10, a rectangular middle plate 11, a rectangular bottom plate 12 longer than the middle plate 11 in the longitudinal direction, A required number of first rib plates radially disposed between the top plate 10 and the middle plate 11
13 and two side plates 14 fixedly provided between the middle plate 11 and the bottom plate 12 with an interval large enough to accommodate a mounting body 2 described later.
And a second rib plate 15 disposed in a required number between the middle plate 11 and the bottom plate 12. An appropriate number of, for example, eight long holes 16 are provided in the longitudinal direction at the edge of the long side of the bottom plate 12, for a total of 16 long holes.

Reference numeral 2 denotes a pair of attachments which are movably attached to the base 1 in a straight line direction (that is, the longitudinal direction of the bottom plate 12 or the direction in which the long holes 16 are formed). The top plate 20 which can be stored between the two side plates 14, the middle flange plate 21, the bottom plate 22, and the two side plates 14 of the base 1 between the top plate 20 and the middle flange plate 21. Two first side plates 23 fixedly arranged at such an interval that a cylinder 50 to be described later can be accommodated between the first side plate 23 and a mounting body 29 disposed between the two side plates 23, and Number of first rib plates 24, and two second side plates 25 fixedly provided between the middle flange plate 21 and the bottom plate 22 with an interval large enough to accommodate an arm 51 and a movable holding member 4 described later. Consists of The middle flange plate
A notch 27 for accommodating an arm 51 to be described later is provided on one side of the base 21, and through holes 28 are provided on both side edges of the middle flange plate 21 in a required number, for example, 10 corresponding to the slots 16 of the base 1. A total of 20 units are provided. Thus, the upper part of the pair of mounting bodies 2 (the part above the middle flange plate 21) is housed between the two side plates 14 of the base 1, and furthermore, the long holes 16 of the bottom plate 12 of the base 1 are Align the through hole 28 of the middle flange plate 21 of the mounting body 2 appropriately,
A bolt nut 66 is fastened to the long hole 16 and the through hole 28. As a result, the pair of attachment bodies 2 can be attached to the base 1 so as to be movable in a straight line direction (the longitudinal direction of the bottom plate 12 or the direction in which the long holes 16 are formed).

Reference numeral 3 denotes a fixed holding member fixed on the lower surface of the other side portion (opposite to the notch 27) of the middle flange plate 21 of the pair of mounting members 2 described above. It has a shape capable of penetrating into the pile P, and a convex portion 30 is provided on one surface (right surface) of one (left) fixed holding member 3 and one surface (left surface) of the other (right) fixed holding member 3. There is provided a concave portion 31 into which the convex portion 30 can fit.

4 is between the two second side plates 25 of the pair of mounting bodies 2
The movable holding members are opposed to the other surface of the fixed holding member 3 and are respectively mounted so as to be movable (oscillated) in the same direction as the moving direction of the mounting body 2 via a cylinder 50, an arm 51 and the like which will be described later.

Reference numerals 20 and 51 denote movable holding member drive units interposed between the mounting body 2 and the movable holding member 4, and in this example, cylinders
50 and an arm 51. This cylinder 50 is attached to mounting body 2
And the base of the cylinder 50 is attached to the mounting body 29 by the pin 52 so that the direction of movement of the mounting body 2 coincides with the direction of movement of the cylinder 50 and the piston rod 54. While pivoting, the center of the arm 51 is
One end (upper end) of the arm 51 and the tip of the piston rod 54 of the cylinder 50 are rotatably attached to the upper portion between the two second side plates 25 by a pin 55. At the other end (lower end) of the arm 51, the movable holding member 4 located at a lower portion between the two second side plates 25 of the mounting body 2 is pinned.
Pivoted by 56. As a result, the movable holding member 4 can be attached to the pair of attachments 2 so as to face the fixed holding member 3 and to be movable in the same direction as the movement of the attachment 2.

In order to use the chuck device according to the above-described known technique, first, the lower part of the fixed holding member 3 is inserted into the steel pipe pile P, and the piston rod 54 of the cylinder 50 is extended, so that the movable holding member 4 is moved in the arrow direction (the 6), and the steel pipe pile P can be clamped together with the fixed clamping member 3.

The portion where the fixed holding member 3 and the movable holding member 4 abut against the steel pipe pile P is easily damaged by a large pressure or frictional force, so that the claw members 6, 6 'made of quenched and tempered steel are attached. I have.

FIG. 7 is a schematic two-sided view showing a conventional technique relating to the mounting structure of the above-mentioned claw member 6, and FIG. 7 (B) is an external view seen from the same direction as FIG. 5 and FIG. . This is shown in FIG. 1A when viewed in the direction of arrow A.

The claw member 6 is formed with anti-slip irregularities (teeth) 6a, but the shape shown in FIG. 7 (B) is roughly trapezoidal and has a pair of slopes 6b. I have.

On the other hand, the movable holding member 4 is provided with a dovetail groove 4b having a pair of tapered surfaces 4a corresponding to the pair of slopes 6b. Reference numeral 7 denotes a bolt / nut for mounting.

Each of the movable holding member 4 and the claw member 6 is provided with a groove having a semicircular cross section, and the bolt of the bolt nut 7 is inserted and fastened through a through hole formed with the respective groove facing each other. I have.

FIG. 8A shows a mounting structure of a conventional example different from the above, and a cross section taken along line BB of FIG. 8A is shown in FIG. This conventional example is different from the above-described conventional example (FIG. 7) in that it is attached with a holding plate 8a and holding bolts 8b. In FIG. 8, the unevenness 6a provided on the claw member 6 is indicated by a chain line.

[Problems to be solved by the invention]

In both the claw member mounting structure shown in FIG. 7 and the claw member mounting structure shown in FIG. 8, the claw member is fixed mainly by fitting the tapered surface 4a of the dovetail groove 4b to the inclined surface 6b of the claw member 6. Relying on power.

If the dovetail groove is loosely fitted, the fixing of the claw member 6 becomes incomplete, and the predetermined holding function is not performed. But,
If the dovetail fitting is severe, stress concentration occurs at the R portion in the figure, causing breakage.

Further, if the dovetail engagement is severe, it must be hit with a hammer when attaching and detaching to replace the claw member, which wastes a lot of time and labor.

The present invention has been made in view of the above circumstances, and has no danger of generating excessive stress on a member to which a claw member is attached, is easy to attach and detach, and can be securely attached without play. The purpose is to provide a structure.

[Means for solving the problem]

In order to achieve the above object, according to the present invention, a cross section of a claw member attached to a chuck device for piles is configured to have a trapezoidal shape, and a fitting portion of the claw member is fitted to the vicinity of the bottom of the trapezoid. In the mounting structure of the claw member provided with the dovetail groove, of the member having the dovetail groove for mounting the claw member, a portion including one of a pair of tapered surfaces forming the dovetail groove is divided to form a slider; Further, a screw means is provided for pressing one half of the tapered surface provided on the slider obliquely to the trapezoidal slope of the claw member.

Pressing obliquely here means pressing in a direction oblique to the tapered surface of the dovetail groove.

In the present invention, a trapezoid means a quadrilateral in which one set of sides is parallel and the other set is not parallel, and a shape having two right angles is also included in the technical scope of the present invention.

[Action]

According to the above configuration, the pair of tapered surfaces forming the dovetail groove are each formed by a divided member, and the slider forming one tapered surface obliquely presses the slope of the claw member. Therefore, the dovetail groove and the claw member are fitted without play, and an appropriate preload can be given.

In this case, it cannot be tightened without backlash when pressed in parallel with the inclined surface of the claw member, and when pressed at right angles, a large surface pressure cannot be obtained at a rate requiring a large tightening force. When pressed against, by the principle of the slope, a large surface pressure is obtained compared to the tightening force of the screw means,
The claw member can be firmly tightened without play.

Further, when the tightening force is released by loosening the screw means, the claw member can be easily removed.

Further, since it is not necessary to hammer the nail member with the hammer as in the conventional example, there is no possibility of generating excessive stress.

〔Example〕

FIG. 1 is a partial cross-sectional view showing one embodiment of a claw member mounting structure according to the present invention.

Reference numeral 4 'denotes a movable holding member, and reference numeral 3' denotes a fixed holding member to which claw members 6, 6 'are attached.

For example, the movable holding member 4 'is provided with a dovetail groove 4b' having one tapered surface 4a, and the other tapered surface of the dovetail groove is formed on the slider 9, and the slider 9 is provided with a bolt 10 To the right of the figure, and tighten a pair of slopes of the claw member 6.

The mounting structure of the claw member 6 'to the fixed holding member 3'
It is a similar structure symmetrical to the above.

FIG. 2 is a schematic diagram of a mounting structure of the claw member 6 'to the fixed holding member 3'.

In practicing the present invention, the above-mentioned claw member 6 'may be formed in a shape such as 6 "shown by a chain line in FIG.

A part of the fixed holding member 3 'is divided to form a slider 9' that can slide in the left-right direction in the figure.

The surface 3a provided on the fixed holding member and the surface 9a provided on the slider 9 'form a tapered surface of the dovetail groove 3b, and are fitted to a pair of inclined surfaces 6b of the claw member 6'.

When the bolt 10 is tightened, the slider 9 'is pulled to the right in the figure, pressing the tapered surface 9a against the inclined surface 6b.

At this time, due to the boosting action of the screw and the principle of the slope, the dovetail fitting is performed with a surface pressure significantly larger than the manual operation force applied to the bolt 10. For this reason, the claw member 6 'is firmly attached without play.

However, as long as the bolt 10 is manually tightened, there is no possibility of generating excessive stress that may damage the dovetail fitting portion.

Further, if the bolt is loosened, the attachment / detachment / replacement of the claw member 6 'can be performed quickly and easily.

FIG. 3 is a schematic view showing an embodiment different from the above. The slider 9 "of this example is fixed and held by a bolt 10 with a holding member 3".
And the claw member 6 'is fixed by dovetail fitting. The configuration of the present example (FIG. 3) differs from the configuration of the previous example (FIG. 3) in the type of driving of the slider by the bolt 10. However, the slider (9 'or 9 ") is formed by screw means.
Are similar in that a driving force is applied to the right side of FIG.

〔The invention's effect〕

As described above, according to the claw member mounting structure of the present invention, there is no possibility that excessive stress is generated in the member to which the claw member is mounted, and the claw member can be quickly and easily replaced. Moreover, the claw member can be firmly attached without play.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing one embodiment of the present invention. FIG. 2 is a schematic diagram in which a main part of the above embodiment is cut and drawn. FIG. 3 is a schematic view of an embodiment different from the above. FIG. 4 is an external view of a conventional vibratory pile driving machine provided with a chuck device. FIG. 5 is an external view showing a conventional chuck device different from the above, and FIG. 6 is a sectional view of the same. FIG. 7 shows a mounting structure of a claw member according to the prior art, wherein FIG. 7 (B) is an external view and FIG. FIG. 8 shows a mounting structure of a claw member according to a conventional technique different from the above, wherein FIG. 8A is an external view, and FIG.
It is sectional drawing. 3,3 ', 3 "... Fixed holding member, 3a ... Tapered surface, 4,4' ...
… Movable holding member, 6, 6 ', 6 ″… claw member, 6a… unevenness (teeth), 6b …… slope, 9, 9 ′, 9 ″… slider, 9a ……
Tapered surface.

Claims (1)

(57) [Claims] 1. A claw member having a trapezoidal cross section of a claw member to be mounted on a chuck device for a pile, and a claw member provided with a dovetail groove at a mounting portion of the claw member to be fitted to a vicinity of the bottom of the trapezoid. In the structure, of the member having the dovetail groove for attaching the claw member,
A screw which divides a portion including one of a pair of tapered surfaces forming a dovetail groove to constitute a slider, and obliquely presses a half of the tapered surface provided on the slider against a trapezoidal slope of the claw member. A mounting structure of a claw member for holding a pile, characterized by comprising means.