JP2001173356A - Holding fixture for auger screw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save the labor of the holding of an auger screw. SOLUTION: The holding fixture 1 for the auger screw has the first engaging section 3 extended from a base section 2 and the second engaging section 4. The blade 11 of the auger screw 10 is engaged so as to be held by the first engaging section 3 and the second engaging section 4, the base section 2 is supported at the upper end of a steel pipe 20, and the auger screw 10 is held at the upper end of the steel pipe 20. An extending section 5 is extended from the base section 2 on the outside of the outer circumference of the steel pipe 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auger screw for excavating the ground from the inside of a tubular body such as a steel pipe, when the auger screw is separated from a rotary driving device for supporting and rotating the auger screw. The present invention relates to a holder for an auger screw that is held while being inserted into a cylinder.

[0002]

BACKGROUND ART Civil engineering works using auger screws,
For example, in a digging method for burying a ready-made pile or constructing a cast-in-place pile, an auger screw is used to discharge or penetrate a steel pipe such as a casing or a hollow pile penetrating into the ground. In addition, when a steel pipe to be a steel pipe sheet pile, a steel pipe pile, or the like is press-fitted, there is a method of facilitating the press-fitting of the steel pipe by performing press-fitting while excavating inside the steel pipe. The auger screw is also used for press-fitting a tubular concrete pile instead of a steel pipe pile or a steel sheet pile.

For mounting and driving such an auger screw, for example, a rotary drive is mounted on a leader of a working machine so as to be movable along the leader, and the auger screw is mounted on a downwardly directed output shaft of the rotary drive. A structure in which the upper ends are connected by flange connection or pin connection is employed.
The auger screw is rotated by the activation of the rotary driving machine, and penetrates into the ground by applying thrust to the auger screw by its own weight thrust or another thrust device of the rotary driving machine.

[0004] When excavating the inside of a steel pipe to be a hollow pile, a steel pipe pile or a steel pipe sheet pile with an auger screw as described above, the auger screw is collected when the auger screw is connected so as to be added or after the excavation is completed. In this case, the auger screw is removed from the rotary drive. In this case, for example, in order to remove the auger screw from the rotary drive with the auger screw being pulled up to some extent, it was necessary to hold the auger screw removed from the rotary drive so as not to fall into the steel pipe.

For example, as shown in FIG. 4, an auger screw 10 is prevented from falling by an auger screw holder 100 (hairpin). The holder 100 of the auger screw has a rectangular shape, and the length of the longer side is longer than the diameter of the steel pipe. On one end side of the holder 100, a notch is formed which is wider than the diameter of the shaft 12 of the auger screw 10 and is narrower than the diameter of the spiral wing of the auger screw 10 in plan view. As a result, approximately U
A letter-shaped engaging portion 101 is formed. In addition, holder 1
00 is provided with a hook 102 for hanging a hook or the like when hoisted by a crane or the like, and a balance weight 103 for balancing when hoisted.

[0006] On the upper end of the steel pipe 20, the retainer is held in such a manner that the spiral wing 11 of the auger screw 10 sandwiches the shaft 12 in the upper and lower gaps of the wing 11 around the shaft 12. While the engaging portion is inserted, the holder 10
0 is placed on the steel pipe 20. As a result, the auger screw 10 is in a state where the wings 11 are placed on the engaging portion 101 of the holder 100 placed on the steel pipe 20 while the shaft 12 is penetrated. And is not dropped into the steel pipe 20.

[0007]

However, the conventional auger screw retainer is large and heavy because its long side is longer than the diameter of the steel pipe. It had to be lifted by a crane and used. That is, since the holding tool 10 is too large and too heavy to handle easily, a lifting operation or the like by a crane is required for handling, and it takes time and effort to remove the auger screw from the rotary drive. .

Accordingly, an object of the present invention is to save labor for removing an auger screw for excavating the ground from inside a steel pipe from a rotary support portion.

[0009]

SUMMARY OF THE INVENTION In order to solve the above problems, the invention according to claim 1 is applicable to a case where the above-mentioned cylinder is moved downward while being buried in the ground while excavating the inside of the cylinder with an earth auger. An auger screw retainer for holding the auger screw inserted into the cylindrical body at the upper end of the cylindrical body when removing the auger screw of the earth auger from the rotation support portion rotatably supporting the earth auger; At
An engaging portion that detachably engages with the wing so as to sandwich the wing of the auger screw from above and below, and extends from the engaging portion beyond the outer periphery of the cylindrical body, and is supported on an upper end of the cylindrical body. And a supporting portion to be provided.

Here, the cylindrical body is, for example, a steel pipe sheet pile,
Examples include steel pipe piles, hollow piles, tubular concrete sheet piles, tubular concrete piles, and casing auger casings (cylindrical steel pipes). As described above, according to the first aspect of the present invention, the engaging portion engages so as to sandwich the wing of the auger screw from above and below, and extends from the engaging portion so as to extend beyond the outer periphery of the cylindrical body. Since the portion is supported by the upper end of the cylindrical body, the length of the holder slightly exceeds the outer circumference of the cylindrical body along the radial direction of the cylindrical body from a portion where the engaging portion of the auger screw is engaged, for example. The extent, that is, a length about the radius of the cylindrical body or shorter is sufficient, and the width and thickness are extremely large with respect to the diameter of the cylindrical body if the strength for holding the auger screw can be secured. It can be narrow. Therefore, the holding tool of the present invention can be made extremely small and lightweight, compared to the conventional holding tool whose long side is longer than the diameter of the steel pipe (tubular body). Can be handled with Therefore, the holder of the present invention does not need to use a lifting device such as a crane for handling, so that it is possible to save labor, work time, and energy saving when removing the auger screw from the rotating support portion. it can.

According to a second aspect of the present invention, there is provided the holder for the auger screw according to the first aspect, wherein the holding portion is provided outside the outer periphery of the cylinder and below the upper end of the cylinder. It is characterized by including an extending portion that extends.

As described above, according to the second aspect of the present invention, since the extending portion extends downward from the upper end of the steel pipe outside the outer periphery of the steel pipe, the auger screw may have some external force or its own weight. When the auger screw tries to drop while rotating, the engaging portion of the auger screw engaging with the auger screw wing is pulled by the rotation of the auger screw, so that the holder abuts on the upper end of the steel pipe of the supporting portion. When the extension is brought into contact with the outer peripheral surface of the cylindrical body when being dragged while rotating about the contacting portion as a center, the rear end of the holder is dragged toward the inside of the cylindrical body. Can be prevented.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An auger screw holder according to an embodiment of the present invention will be described below. FIG. 1 is a side view showing an auger (earth auger) to which the auger screw holder of this example is applied. Also, FIG.
It is a side view which shows the holder of this example of an auger screw, FIG. 3: is a top view which shows the said auger from an upper surface.

In this embodiment, the present invention is applied to press-fitting a steel pipe sheet pile into the ground while excavating the inside of the steel pipe sheet pile (cylindrical body) with an earth auger. And so on. In addition, the tubular body buried in the ground while the inside is excavated by the earth auger is not limited to steel pipe piles, and various types of hollow piles include steel pipe piles, tubular concrete piles or sheet piles, and casings. It may be used as an auger casing.

The auger has a well-known auger screw 10 for excavating and discharging the ground, and has a spiral wing 11 on the outer periphery of a shaft 12 of the auger screw 10. Press-fitting of a steel pipe sheet pile using this auger will be briefly described. The auger screw 10 is inserted into a hollow portion of a steel pipe sheet pile (hereinafter referred to as a steel pipe) 20 and built. Next, the ground at the lower end of the steel pipe 20 is excavated by rotating the auger screw 10 with a rotary drive device (not shown), and the excavated earth and sand is discharged. At this time, the steel pipe 20 is pressed into the ground by a well-known pile press-in device.

In the press-fitting of the steel pipe sheet pile, when the auger screw is connected or the auger screw is recovered, the auger screw 10 that penetrates the inside of the steel pipe 20 that penetrates into the ground is connected to the upper end of the steel pipe 20. The auger screw holder 1 of this example is used in order to hold it.

The construction of the auger screw holder 1 will be described. As shown in FIG. 2, the holder 1 for the auger screw includes a base 2, an extension 5 extending from the base 2 in a predetermined direction, and a direction substantially perpendicular to the direction in which the extension 5 extends. First engaging portion 3 extending from base portion 2 in the direction
And the second engaging portion 4.
The first engaging portion 3 and the second engaging portion 4 have a predetermined interval between the first engaging portion 3 and the second engaging portion 4 which are substantially parallel to each other in the extending direction of the extending portion 5. Are provided. The distance between the first engaging portion 3 and the second engaging portion 4 is determined by the wing 1 to be inserted.
1 is almost the same. In this embodiment, the first engaging portion 3 and the second engaging portion 4 extend in substantially the same direction, but the first engaging portion 3 and the second engaging portion 4 The extending directions of the auger screw 10 and the first engaging portion 3 and the second engaging portion 4 do not need to be the same.
It is sufficient that the wings 11 can be sandwiched vertically.

The attachment of the auger screw holder 1 will be described. Referring to FIG. 1, near the upper end of steel pipe 20, insert wing 11 of auger screw 10 in a gap between first engagement portion 3 and second engagement portion 4, and the first engagement The part 3 and the second engaging part 4 engage with each other so as to sandwich the wing 11 of the auger screw 10 up and down. The base 2 extends from the first engaging portion 3 and the second engaging portion 4 beyond the outer periphery of the steel pipe 20, and the lower end of the base 2 contacts the upper end of the steel pipe 20. I try to touch. Thus, the base portion 2 is supported on the upper end of the steel pipe 20. It is noted that the bottom 2a of the gap between the first engaging portion 3 and the second engaging portion 4 is brought into contact with the outer edge 11a of the wing 11, and the wing 11 is inserted into the gap therebetween. Desirable (FIG. 2). This makes it difficult for the wing 11 to separate from between the first engagement portion 3 and the second engagement portion 4.

When the wing 11 is inserted into the gap between the first engaging portion 3 and the second engaging portion 4, the extending portion 5 is directed downward. And this extension part 5 is a steel pipe 20
Is extended downward from the upper end of the steel pipe 20 outside the outer periphery of the steel pipe 20.

The operation and effect of the auger screw holder 1 having the above configuration will be described. Referring to FIG.
The weight of the auger screw 10 is applied to the first engagement portion 3. At this time, the auger screw 1 is supported by the base portion 2 being supported while being placed on the upper end of the steel pipe 20.
0 can be held at the upper end of the steel pipe 20. The extension 5 is disposed outside the steel pipe 20 and the steel pipe 2
As shown in FIG. 3, when the auger screw 10 rotates for some reason, the holder 1 rotates while being dragged by the rotation of the auger screw 1 so that Even if the rear end of the base portion 2 of the tool 1 that goes out of the steel pipe 20 moves toward the inside of the steel pipe 20, the extension 1 contacts the outer peripheral surface of the steel pipe 20, so that the holder 1 is moved. It will be kept on the steel pipe 20.

The holder 1 as described above does not need to have a length longer than the diameter of the steel pipe as in the prior art, and the length along the radial direction of the steel pipe 20 is shorter than the radius of the steel pipe 20. Further, the thickness and width of the holder 1 only need to be strong enough to support the auger screw 10. Therefore, the holder 1 of this example can be made sufficiently large and heavy enough to be hand-held and handled by an operator. Therefore, the labor for moving the auger screw holder 1 to the upper end of the steel pipe 20 is reduced, and it becomes easier to hold the auger screw 10 at the upper end of the steel pipe 20.

Further, in the above embodiment, it is needless to say that the specific detailed structure and the like can be appropriately changed, and the present invention is not limited to the above embodiment. For example, a groove may be provided on the lower edge of the base 2 and the upper end of the steel pipe 20 may be engaged with the groove.

[0023]

According to the auger screw retainer according to the first aspect of the present invention, the retainer is extremely lighter than the conventional retainer whose long side is longer than the diameter of the steel pipe (tubular body). Can be handled by an operator. Therefore, the holder of the present invention does not require the use of a lifting device such as a crane for handling, and can save labor, work time, and energy when removing the auger screw from the rotary drive. it can.

According to the auger screw retainer according to the second aspect of the present invention, since the extending portion extends downward from the upper end of the steel pipe outside the outer periphery of the steel pipe, the auger screw is subjected to some external force or When the auger screw is rotated by its own weight or the like and falls, the engaging portion of the auger screw that is engaged with the auger screw wing is pulled by the rotation of the auger screw, so that the auger screw retainer is moved to the supporting portion. When it is pulled around while rotating about the part that is in contact with the upper end of the steel pipe, the extending portion comes into contact with the outer peripheral surface of the steel pipe, and the rear end of the auger screw retainer is pulled inward toward the inside of the steel pipe. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a side view showing an auger to which an auger screw holder according to an embodiment of the present invention is applied.

FIG. 2 is a side view showing a holder of the auger screw.

FIG. 3 is a drawing for explaining the operation of the auger screw holder.

FIG. 4 is a view showing a conventional auger screw holder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Holder of auger screw 2 Base part (support part) 3 First engagement part (engagement part) 4 Second engagement part (engagement part) 5 Extension part 10 Auger screw 11 blade 20 Steel pipe (tube) body)

Claims (2)

[Claims] When the cylindrical body is moved downward while being buried in the ground while excavating the inside of the cylindrical body with an earth auger, the cylindrical auger is removed from a rotation support portion that rotatably supports the auger screw of the earth auger. An auger screw retainer for holding the auger screw inserted into the cylindrical body at an upper end of the cylindrical body, and detachably attached to the wing so as to sandwich the auger screw wing from above and below. An auger screw characterized in that it comprises an engaging portion that engages with, and a support portion that extends from the engaging portion beyond the outer periphery of the cylindrical body, and that is supported at an upper end of the cylindrical body. Holder. 2. The auger screw retainer according to claim 1, further comprising an extending portion extending from the support portion toward an outer side of an outer periphery of the cylindrical body and below an upper end of the cylindrical body. An auger screw retainer, characterized in that: