JPH061627Y2 - Earth Ogre - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is directed to an auger screw equipped with a drilling blade body whose diameter is expanded according to the rotation of a drilling method, and a steel sheet pile is pushed and locked to the tip side. TECHNICAL FIELD The present invention relates to an improved technique for an earth auger including a tubular casing for incorporating an auger screw including a tool.

[Conventional technology]

The pushing of the steel sheet pile into the ground by the above earth auger is performed as follows.

That is, while the fitting portion of the steel sheet pile (hereinafter, referred to as the first steel sheet pile) that has been pushed in is fitted to the joining portion of the steel sheet pile (hereinafter, referred to as the first steel sheet pile) that has been previously pushed. While engaging an engaging body provided on the inner surface of the web on the lower side of the second steel sheet pile from above with a locking tool continuous with the tubular casing, while rotating the auger screw in the excavating direction in such a state , The cylindrical casing is pushed into the ground, at this time, by excavating the underground by excavating the excavating blade body at the tip of the auger screw, the cylindrical casing precedes the outer diameter thereof. Since a wide range is excavated, not only the tubular casing but also the second steel sheet pile engaged with the tubular casing can be easily pushed.

[Problems to be solved by the invention]

By the way, it goes without saying that the outer diameter when the diameter of the excavating blade body is expanded is restricted so that the blade body does not come into contact with the connecting portion of the first steel sheet pile that has already been pushed in. As shown in FIG. 4, the corners on both sides of the web of the second steel sheet pile 8 and the other steel sheet pile connecting portion 8a are out of the excavation range of the excavation blade body 6, and the points out of this excavation range are By the large resistance of pushing the second steel sheet pile 8 into the ground,
In particular, when the excavated ground is clay, gravel, silt, or the like, it is often difficult to push the second steel sheet pile 8 into the ground.

Therefore, as shown in FIG. 5, the mounting position of the engaging body 9 connected to the steel sheet pile 8 is slightly deviated in the width direction of the web 8b,
The excavation range of the excavation blade body 6 relative to the steel sheet pile 8 is biased, and thus the outer diameter when the diameter of the excavation blade body 6 is expanded without being restricted by the connecting portion of the first steel sheet pile 8. To allow for a greater than
Means for enabling excavation near the corners of the steel sheet pile 8 on both sides of the web and the portions corresponding to the other connecting portion have been proposed.

According to this means, regardless of the nature of the excavated ground, the second
The steel sheet pile 8 can be easily pushed into the ground, which is extremely advantageous for pushing the steel sheet pile into the ground, but two types of steel sheet piles having different attachment positions of the engaging bodies 9 must be prepared. There was a problem.

[Means for solving problems]

The present invention has been devised in view of the above circumstances, and does not provide an earth auger that solves the problems in the technology while utilizing the excellent technology for biasing the excavation range of the excavation blade body with respect to the steel sheet pile. Is intended.

To achieve the above object, the earth auger according to the present invention is configured such that the outer diameter of the auger screw is smaller than the inner diameter of the tubular casing, and the rotation axis of the auger screw is the tubular axis of the tubular casing. It is characterized in that the screen biasing member that is biased with respect to is provided so as to be positionally changeable and fixed around the cylinder axis of the cylindrical casing.

[Action]

According to the above-mentioned characteristic configuration, the excavation range of the excavation blade body with respect to the tubular casing is offset by changing the position of the member for skeleton biasing around the tubular axis of the tubular casing.

That is, while the engagement position of the steel sheet pile with respect to the tubular casing is always constant, the excavation range of the excavation blade body with respect to the steel sheet pile can be biased, and thus the steel that the excavation blade body has pushed in first. It is possible to increase the outer diameter when the diameter of the excavating blade is expanded without being restricted by the connecting portion of the sheet piles.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an excavator equipped with an earth auger 1, a swivel base 3 provided in a crawler traveling device 2, an outrigger 4, and an outrigger 4.
4 and an operator room 5 are provided, and the earth auger 1 is provided on the front side of the operator room 5 with respect to the swivel base 3.

The earth auger 1 has an auger screw 7 having a tip of an excavating blade body 6 whose diameter is expanded according to the rotation in the excavating direction, and a locking tool 10 which is detachable from an engaging body 9 attached to a steel sheet pile 8. It is composed of a cylindrical casing 11 having an auger at the tip for incorporating an auger screw, and a screw drive device 13 that can be raised and lowered with respect to a guide column 12 that is erected on the swivel base 3.
Also, the tubular casing 11 is suspended and connected to a casing drive device 14 that is also vertically movable with respect to the guide column 12.

As shown in FIG. 3, the outer diameter d of the auger screw 7 is shown.
Is configured to be smaller than the inner diameter D of the tubular casing 11 and biases the rotation axis P of the auger screw 7 with respect to the tube axis P ₁ of the tubular casing 11.
Is provided on the lower side of the tubular casing 11 so as to be positionally fixed and fixed around the tubular axis P _{1 of the} tubular casing 11.

The biasing mechanism 15 is configured as shown in FIGS. 2 and 3.

That is, the thickness T at the center in the width direction is slightly thinner than the difference (D−d = Δd) between the inner diameter D and the outer diameter d, and the semi-cylindrical deviation screw biasing member 16 has a thinner wall toward both sides in the width direction.
Is provided on the inner surface side of a tubular member 17 having substantially the same shape as the tubular casing 11, and a semi-cylindrical member 18 having a shape that is substantially in close contact with the outer surface side of the tubular casing 11 is provided for the screw biasing member.
Provided on the outer surface side of the tubular member 17 in correspondence with 16, and
While forming a long hole a in the circumferential direction in the semi-cylindrical member 18,
When the tubular member 17 is in contact with the lower end of the tubular casing 11, a screw hole c into which the retaining bolt b inserted through the elongated hole a is screwed is provided to the tubular casing 11. It is screwed directly under 10 to restrict the range of rotation of the cylindrical member 17 around the cylindrical axis P ₁ of the cylindrical casing 11 by the elongated hole a.

Then, in order to fix the position of the cylindrical member 17 at the rotating end,
The screw for biasing member 16 is provided with a screwing hole f for the bolt e, and two bolt insertion holes g, g corresponding to the screwing hole f are provided at the rotating end of the cylindrical member 17. .

In addition, as shown in FIG.
The rotation angle of each is set to 45 ° with respect to the line Q connecting the stop bolt b and the cylinder axis P ₁ , but this is not an essential requirement and can be set arbitrarily. .

According to the above configuration, by changing the position of the Screille biasing member 16 around the tubular casing 11, as shown in FIG. 3, the engagement position of the steel sheet pile 8 with the tubular casing 11 is always constant. However, the excavation range of the excavation blade body 6 can be biased around the cylinder axis P _{1 with} respect to the cylindrical casing 11, and therefore, the excavation blade body is inserted into the connecting portion 8a of the first steel sheet pile 8 that has been previously pushed. The auger blade 7 is provided with the excavating blade body 6 capable of maximizing the excavating range in a state where the auger 7 is not contacted.
By equipping the tip of the second steel sheet pile 8, the range including most of the second steel sheet pile 8 to be pushed next can be excavated prior to the second steel sheet pile 8, and thus the pushing of the steel sheet pile 8 is performed. Even if the target ground is clay, gravel, or the like, the steel sheet pile 8 can be easily pushed.

[Effect of device]

As described above, according to the earth auger of the present invention, the excavating range of the excavating blade body with respect to the tubular casing is biased by changing the position of the Screwl biasing member around the tubular axis of the tubular casing. While the engagement position of the steel sheet pile with respect to the tubular casing is always constant, the excavation range of the excavation blade body with respect to the steel sheet pile can be biased, and the steel sheet pile pushed by the excavation blade body first. It is possible to increase the outer diameter when the diameter of the excavating blade is expanded without being restricted by the connection part of the. It is based on Fig. 5 regardless of the nature of the excavated ground. The steel sheet pile can now be easily pushed into the ground in a state almost the same as the conventional one described.

Moreover, as described above, by biasing the excavation range of the excavating blade body with respect to the tubular casing, the engagement position of the steel sheet pile with respect to the tubular casing can be made constant at all times, and therefore the attachment position of the engagement body is constant. Since the steel sheet pile can be pushed in, there is an advantage that only one type of steel sheet pile needs to be prepared.

[Brief description of drawings]

FIG. 1 is a side view of an excavator, FIG. 2 is an exploded perspective view of a biasing mechanism, and FIG. 3 is a horizontal sectional view showing an excavation range. 4 and 5 are horizontal cross-sectional views showing the excavation range of the conventional example. 6 ... Excavating blade, 7 ... August cru, 8 ... Steel sheet pile, 10 ...
Fastener, 11 ... tubular casing, 16 ... Sukuriyu biasing member, d ... outer diameter, D ... inner diameter, P ... rotational axis, P ₁ ... cylinder axis.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. An auger screw having a tip with an excavating blade that is expanded in diameter in accordance with the rotation in the excavating direction, and a cylindrical casing for incorporating an auger screw having a stopper for pushing a steel sheet pile on the tip side. An earth auger consisting of a screw screw configured to make the outer diameter of the auger screw smaller than the inner diameter of the tubular casing and to bias the rotation axis of the auger screw with respect to the tubular axis of the tubular casing. The earth auger, wherein the biasing member is provided so as to be positionally fixed around the cylinder axis of the cylindrical casing.