JP2506049B2 - Ogre method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auger construction method in which an auger machine is used for constructing piles and pillar-type underground continuous walls.

[0002]

2. Description of the Related Art An auger machine is composed of a hydraulic motor and a speed reducer as an auger device, and a driving mechanism which is connected to a driving mechanism including an auger head at the tip of the driving mechanism. With the rods connected, the wires are suspended from the top sheave of the leader mast standing on the base machine such as a crawler with a wire. Further, the drive mechanism engages a leader provided along the leader mast with a curved bracket provided on the back surface.

[0003] A driving mechanism drives the auger screw rod to rotate and excavates with an auger head to dig into the ground in a conical shape. At the time of such excavation, a congealing liquid such as cement milk is discharged from the auger head. It is also practiced to mix soil with in-situ soil to construct soil cement piles.

[0004]

As described above, in such an auger machine, the auger screw rod is rotationally driven to be built in a conical shape in the ground, and rocks and hard parts. If the auger head hits, a large load will be applied, and excavation will be continued with the entire rod bent, which may adversely affect the accuracy of the pile to be constructed.

On the other hand, as shown in FIG. 2, a casing auger method is also used in which a casing 2 is arranged around the auger screw rod 1 and the auger screw rod 1 and the casing 2 are rotated in opposite directions to excavate. ing.

According to this construction method, when the building is carried out in (a) of FIG. 2 and the excavation building is completed in (b),
In (c), the earth and sand will be backfilled, and in (d) the construction will be completed.

In the casing auger method, bending of the auger screw rod 1 is less likely to occur due to the presence of the casing 2. However, when the auger screw rod is replenished for excavation at a predetermined depth, it naturally follows that. Accordingly, the casing 2 will be added,
Since the frictional resistance of the long casing 2 in the ground is large, the load on the hydraulic motor and the like is large.

An object of the present invention is to solve the above-mentioned disadvantages of the conventional example, and to provide an auger construction method capable of excavating an auger screw rod with high precision by this casing without lengthening the casing. .

[0009]

In order to achieve the above-mentioned object, the present invention comprises a driving mechanism for a hydraulic motor and a speed reducer, which is connected with an auger screw rod having an auger head at its tip downward. This drive mechanism suspends the auger screw rod with a wire from the top sheave of the leader mast standing on a base machine such as a crawler with the auger screw rod connected, and has an excavating bit at the tip on the outer periphery of the auger screw rod. By using a casing auger device in which a casing is arranged, the upper end of the drilling casing is also connected to a drive mechanism, and the auger screw rod and the drilling casing are rotated in reverse to each other,
After drilling the auger screw rod and the excavating casing in parallel in a simultaneous drive, the excavating casing is separated from the drive mechanism and left in the ground as it is, and the auger screw rod and the drive mechanism already installed are removed. Separate and pull up only this drive mechanism to the upper part of the leader mast, and by connecting a new auger screw rod between this drive mechanism and the already inserted auger screw rod, add only the auger screw rod upwards, After that, the gist is to excavate to a predetermined depth by rotationally driving the auger screw rod that is appropriately added, using the remaining excavation casing as a guide.

[0010]

According to the present invention, the casing is built without adding only one piece. On the other hand, the auger screw rod is newly added to the one excavated together with this casing to excavate this casing as a guide. Excavation accuracy can be secured using the casing as a guide, and the casing can be free from bending.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is an explanatory view showing an embodiment of the casing auger construction method of the present invention, and corresponds to FIG. 2 showing the conventional example.

The present invention also employs the casing auger construction method as in FIG. 2, and although not shown, the auger screw rod 1 has an auger head 3 provided at the tip of a drive mechanism including a hydraulic motor and a speed reducer as an auger device. Is connected downward, and this drive mechanism suspends the wire from a top sheave of a leader mast standing upright on a base machine such as a crawler with the auger screw rod 1 connected.

Further, a casing 2 is arranged on the outer periphery of the auger screw rod 1, and the upper end of the casing 2 is also connected to a drive mechanism so that the auger screw rod 1 and the casing 2 rotate in opposite directions to each other.
The casing 2 is a digging casing having a digging bit at its tip.

As shown in FIGS. 1 (a) and 1 (b), the auger screw rod 1 and the casing 2 are simultaneously driven in parallel to form holes. In this case, the auger screw rod 1
The auger head 3 at the tip of may be slightly ahead or behind the tip of the casing 2.

Next, as shown in (c), the casing 2 is separated from the drive mechanism and left as it is in the ground, and only the auger screw rod 1 is added upward.
This extension of the auger screw rod 1 separates the already installed auger screw rod 1 from the drive mechanism, and pulls only this drive mechanism to the upper part of the leader mast.
By connecting a new auger screw rod 1 between this drive mechanism and the already inserted auger screw rod 1.

After this, as shown in (d), the auger screw rod 1 is rotatably driven for excavation using the remaining casing 2 as a guide.

As a result, the auger screw rod 1 is guided by the casing 2, and excavation accuracy can be secured.

When pulling up, the auger screw rod 1 is pulled up by the amount added later, and then the auger screw rod 1 having the auger head 3 at the tip and the casing 2 are both connected to a drive mechanism. It shall be raised at the same time.

[0019]

As described above, according to the auger method of the present invention, it is possible to excavate the auger screw rod with high precision without using the casing.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of an auger method of the present invention.

FIG. 2 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

 1 ... Auger screw rod 2 ... Casing 3 ... Auger head

Claims (1)

(57) [Claims] 1. An auger screw rod having an auger head at its tip is connected downward to a drive mechanism of a hydraulic motor and a speed reducer, and this drive mechanism is connected to the auger screw rod. Suspended with a wire from the top sheave of the leader mast standing upright on the base machine such as a crawler, and also arranging a drilling casing having a drill bit at the tip on the outer periphery of the auger screw rod,
By using a casing auger device in which the upper end of the excavating casing is also connected to a drive mechanism so that the auger screw rod and the excavating casing rotate in opposite directions to each other, the auger screw rod and the excavating casing can be simultaneously driven in parallel. After drilling, separate the excavating casing from the drive mechanism and leave it in the ground as it is, separate the auger screw rod and drive mechanism already installed, and place only this drive mechanism on top of the leader mast. By pulling up and connecting a new auger screw rod between this drive mechanism and the already inserted auger screw rod, only the auger screw rod is added upwards, and after that, the remaining excavation casing is used as a guide. , Rotate the auger screw rod to replenish appropriately Dynamic and characterized by drilling to a predetermined depth auger construction method.