JPH0621994Y2 - Forward and reverse rotation auger - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to an earth auger, and more particularly to an auger capable of excavating not only when the auger rotates in the normal direction but also when the auger rotates in the reverse direction.

[Prior art]

In a conventional excavator in which an auger rod of an auger is attached to the lower end of a vertical rotating shaft and the auger rod that rotates by the rotation of the rotating shaft is inserted into the ground to excavate, an excavating blade (auger bit) supports the auger rod. Since it is fixed to the member, it can be excavated when the auger rod is normally rotated, but cannot be excavated when the auger rod is reversed.

[Problems to be solved by the device]

When a soil excavation wall is formed by a conventional excavator, the excavated hole may be bent due to changes in the rotating direction of the auger, changes in geological conditions, and the like. Advances have been made in the method of measuring the vertical accuracy of drill holes, and it is now possible to grasp the tendency of deviation in drill accuracy during drilling. However, the only method for correcting the deviation of the drilling accuracy is to tilt the leader of the excavator. However, when the building next door is close to the construction site, depending on the direction and the degree of deviation, tilting the leader may cause the excavator (auger machine) to hit the adjacent building or excavate. The stability of the machine was lost and it was impossible to satisfactorily correct the hole bend. It has been found that hole bending due to the rotation (forward) direction of the auger can be corrected by rotating the auger head in the opposite direction and excavating. The problem to be solved by the present invention is to provide an auger capable of correcting the hole bending caused by the rotational direction of the auger head by exchanging the rotational direction during excavation and during excavation.

[Means for Solving the Problems]

The present invention adopts the following configuration as a means for solving the above problems. The structure of the present invention is an auger equipped with an auger rod, a support member fixed to the auger rod so as to project in the radial direction of the auger rod, and an excavating blade attached to the support member. The excavating blade is rotatably supported at the position of the supporting member, and the regulating portion for regulating the position of the excavating blade is provided, and when the auger rod rotates in the normal direction or in the reverse direction, the excavating blade that hits the soil of the excavating portion and rotates. A stop position is regulated by the regulation part, and the excavating blade is configured to be in a position suitable for excavation during forward rotation or reverse rotation. The restricting portion that restricts the position of the cutting tool can be provided on the support member or the auger rod. In one embodiment of the present invention, an auger rod forming a part of an auger is projected in its radial direction to fix a supporting member, and an excavating blade equipped with two blades for forward rotation and reverse rotation is provided in a radial direction. The support member is pivotally supported by the shaft of the, and the support member or the auger rod is provided with two restricting portions for restricting the position of the excavating blade, and one of the restricting portions is the position of the excavating blade suitable for excavating the auger rod in the forward rotation. And the other restricting portion determines the position of the excavating blade suitable for excavation when the auger rod is reversed. As means for regulating the position of the excavating blade during excavation, for example, a regulated surface is formed at a portion between the pivot of the excavating blade and a portion having a blade at the tip (for example, the front side and the rear side of this portion). , A regulating member provided on a supporting member or an auger rod so as to come into contact with the regulated surface, and regulated on a portion of the excavating blade on the side opposite to the tip side of the excavating blade with the blade A protrusion is fixed, a regulated surface is formed on the regulated protrusion (for example, the front side and the rear side thereof), and the regulation portion provided on the support member or the auger rod is brought into contact with the regulated surface. The regulated projections are fixed to the left and right surfaces of the blade away from the center of the pivot, the regulated surfaces are formed on the regulated projections (front side and rear side), and the regulated projections are provided on the end surface of the support member, respectively. The regulation part is designed to hit the regulated surface, and so on. To be In short, as a means for regulating the position of the excavating blade during excavation, it is possible to regulate the stop position of the excavating blade during normal rotation and reverse rotation of the auger, which is suitable for excavation during normal rotation or reverse rotation of the auger. Any means may be used as long as it can determine the position of the blade. In the embodiments described below, the supporting members for supporting the excavating blade are provided at two lower portions (that is, both sides) of the auger rod, but two or more supporting members may be provided around the auger rod. The excavating blade is rotatably supported at a position of the support member that is separated from the rotation center of the auger rod. In the embodiments described later, the end of the support member is pivotally supported by a radial pivot, but the excavating blade may be pivotally supported midway in the support member. Further, the excavating blade may be pivotally supported at a plurality of positions such as the end of the support member and the middle of the support member.

[Action]

The auger for forward / reverse rotation of this invention is provided with a drilling blade so that it can be excavated not only when the auger rotates in the forward direction, but also when the auger rotates in the reverse direction. The direction can be switched during excavation, and the auger can be excavated while rotating in the forward or reverse direction. Therefore, it is possible to easily correct the bending of the drilled hole due to the rotation direction of the auger.

【Example】

An embodiment of this invention will be described with reference to FIGS. A support member 4 having a square cross section is fixed to both sides of the portion 2 from the tip of the auger rod 1. The support member 4 has an end face 5 at the tip, and a recess 6 having a bottom surface 7 parallel to the end face 5 is formed in the end face 5. The periphery of the recess 6 is formed of a plate-like body, and includes an upper portion 8 and a front portion 9
And a rear portion 10, and the lower side is open. An inclined surface 11 is formed below the rear side of the front portion 9, and an inclined surface 12 (the inclination angle of the inclined surface 12 is the same as the inclination angle of the inclined surface 11) is formed below the front side of the rear portion 10. There is. The support member 4 has a recess 6 extending in the lengthwise direction thereof.
A circular hole 13 is formed to open at. Also, a small circular hole 14 is formed orthogonal to the circular hole 13. The excavation blade 20 is formed of a thick plate-like body, and its periphery is composed of a lower surface 21, a front inclined surface 22, a front flat surface 25, a rear inclined surface 23, a rear flat surface 26, and an upper arc surface 24. A circular hole 27 is formed in the upper portion of the drilling blade 20. The front sloped surface 22 forms an acute angle α with the lower surface 21, and the rear sloped surface 23 also forms an acute angle β (α
= Β), the front plane 25 and the rear plane 26
And are parallel to each other. A blade 28 is fixed to a corner between the front sloped surface 22 and the lower surface 21, and a blade 29 is fixed to a corner between the rear sloped surface 23 and the lower surface 21. The upper part of the cutting tool 20 is inserted into the recess 6 of the support member 4,
The cylindrical portion 31 of the pivot 30 having the flange portion 32 at the end is inserted into the circular hole 27 of the excavating blade 20, the tip thereof is inserted into the hole 13 of the support member 4, and the small circular hole 3 of the cylindrical portion 31 is inserted.
3 and the small circular hole 14 of the support member 4 are matched, and each small circular hole 1
A pin 40 is driven into the support members 4 and 33 so that the pivot shaft 30 is supported by the support member 4
Fixed to. A head cutter 50 is attached to the tip 3 of the auger rod 1.
To fix. Next, how to use the auger of this embodiment will be described. When the auger rod 1 forming a part of the auger is fixed to the lower end of the vertical rotating shaft of the excavator and the rotating shaft is rotated, the auger rod 1 rotates. When the auger rod 1 rotates forward in the direction of arrow a in FIG. 1, the end surface of the support member 4 rotates in the direction of arrow a in FIG. According to this rotation, the blade 2 at the lower end of the excavating blade 20
Since the soil of the excavation portion hits a portion of 8 and pushes this portion in the direction of arrow c, the excavation blade 20 rotates, and the flat surface 26 on the rear side (that is, the regulated surface) of the rear portion 10 of the support member 4. It stops by hitting the inclined surface 12 (that is, the restricting portion). This stopped position is a position suitable for excavation during normal rotation of the excavation blade 20 [position of solid line in FIG. 3 (a)], and excavation is performed at the forward rotation position of the excavation blade 20 as long as the forward rotation continues. . When the auger rod 1 reversely rotates in the direction of arrow b in FIG. 1, the end surface of the support member 4 rotates in the direction of arrow b in FIG. According to this rotation, the blade 2 at the lower end of the excavating blade 20
Since the soil of the excavated portion hits a certain portion of 9 and pushes this portion in the direction of the arrow d, the excavated cutting tool 20 rotates, and the plane 25 (regulated surface) on the front side of the excavated blade 20 of the front portion 9 of the support member 4 moves. It stops by hitting the inclined surface 11 (regulating portion). This stopped position is a position suitable for excavation at the time of reverse rotation of the excavation blade 20 [position of the solid line in FIG. 3 (b)], and excavation is performed at the reverse rotation position of the excavation blade 20 as long as the reverse rotation continues. . The drilling of the central portion of the excavation hole is performed by the head cutter 50 fixed to the tip 3 of the auger rod 1 during normal rotation or reverse rotation of the auger.

[Effect of device]

This invention rotatably supports an excavating blade at a position of a support member distant from the rotation center of an auger rod, and provides a restricting portion for restricting the position of the excavating blade. The stop position of the excavating blade that rotates by hitting the soil of the excavating section is regulated by the regulating unit, and the position of the excavating blade is configured to be a position suitable for excavation during forward rotation or reverse rotation. By making a hole while making or reversing it, it is possible to correct the hole bending early and to make a hole with a high vertical accuracy. If the method for measuring the drilling accuracy of the soil machine described in JP-A-62-110111 is also used, it is possible to perform forward / reverse control of the rotating direction of the auger while watching the monitor TV displaying the measurement result. It is possible to easily perform drilling with high vertical accuracy.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention,
1 is a front view of the auger, FIG. 2 is a side view of the auger of FIG. 1, and FIGS. 3 (a) and 3 (b) are support members fixed to the auger rod of FIG. FIG. 3B is a side view showing only the portion of the excavated blade, where (a) shows a position suitable for excavating the excavated blade during forward rotation, and (b) shows a position suitable for excavating the excavated blade during reverse rotation. Is. In the figure, 1 is an auger rod, 4 is a supporting member, 5 is an end surface of the supporting member, 6 is a concave portion, 11 and 12 are restricting portions, 20 is an excavating blade, 25 and 26 are regulated surfaces, 27 is a shaft hole, 28. And 29 are blades, 30 is a pivot, 40 is a stop pin, and 50 is a head cutter.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Koji Kazama 8-21-1, Ginza, Chuo-ku, Tokyo Stock company Takenaka Corporation Tokyo Main Store (72) Inventor Toshiro Sasaki 8-21 Ginza, Chuo-ku, Tokyo No. 1 Stock Company Takenaka Corporation Tokyo Main Store

Claims (1)

[Scope of utility model registration request] 1. An auger equipped with an auger rod, a support member fixed to the auger rod so as to project in the radial direction of the auger rod, and an excavating blade attached to the support member, the auger rod being separated from the rotation center of the auger rod. The digging tool is rotatably supported at the position of the support member, and a regulation part for regulating the position of the digging tool is provided, and when the auger rod rotates in the normal direction or in the reverse direction, it stops by touching the soil of the digging section and rotating. A normal / reverse rotation auger characterized in that the position thereof is regulated by the regulation portion, and the position of the excavating blade is a position suitable for excavation during normal rotation or reverse rotation.