JPH0771030A - Underground continuous wall method by multiple spindle auger - Google Patents

Abstract

PURPOSE:To make it possible to excavate the ground without placing restrictions on depth by interlocking a driving mechanism of a multiple spendle auger with a leader of a leader mast, and releasing interlock to suspend the driving mechanism with a wire after the driving mechanism is lowered down to the lower part of the leader mast along the leader. CONSTITUTION:In the case a multiple spindle auger shaft 5 is rotated and driven by a driving mechanism 4 to make excavation, the driving mechanism 4 is interlocked with a leader 7 of a leader mast 2 through a curved bracket 6, and it is lowered along the leader 7. When the driving mechanism 4 reaches the lower part of the mast 2, the bracket 6 is removed to release the interlock with the leader 7, and the driving mechanism 4 and auger shaft 5 connected thereto are suspended and borne on a wire 10 only. Under such a state, the auger shaft 5 is rotated and driven to continue excavation. A multiple spindle auger is kept in a relatively stabled state without turning the whole body even if it is in a state to suspend it with the wire 10 only by turning reversely parts adjacent to the auger shaft 5 and, at the same time, there is no restriction on depth in the case where excavation is continuously carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a column-row underground continuous wall construction method using a multi-axis auger.

[0002]

2. Description of the Related Art A column-column underground continuous wall construction method using a multi-axis auger is known as a waterproofing earth retaining method and a waterproofing wall method.

Although a multi-axis auger is well known, FIG.
As shown in FIG. 7, an auger shaft 5 is connected to a drive mechanism 4 including a hydraulic motor and a speed reducer in a downward direction, and a plurality of auger shafts 5 (three in the drawing) are arranged in parallel.

The auger shaft 5 is provided with an auger head 5a at its tip, and a screw blade 5b and a stirring blade 5c in the middle thereof. Although not shown, the auger shaft 5 is a hollow shaft, through which a condensing liquid such as cement milk is allowed to flow, and this can be poured out from the discharge port of the auger head 5a.

The drive mechanism 4 is suspended from the top sheave 3 of the leader mast 2 standing upright on the base machine 1 such as a crawler with a wire while the auger shaft 5 is connected. Further, the drive mechanism 4 engages the curved bracket 6 provided on the back surface with the leader 7 provided along the leader mast 2. Reference numeral 8 in the figure is a neck-skein-like steady rest provided at the lower end of the leader mast 2, through which the auger shaft 5 penetrates vertically.

The drive mechanism 4 drives the auger shaft 5 to rotate, and the auger head 5a excavates in a conical shape. At the time of such excavation, a solidified liquid such as cement milk is discharged from the auger head 5a, and the auger head 5a discharges it in the soil. 1 mixed with in-situ soil
Create soil cement walls for the element.

Then, each element of the soil cement wall thus constructed is completely wrapped and connected integrally to form an underground continuous wall.

[0008]

In the multi-axis auger, excavation is performed by lowering the drive mechanism 4 along the leader 7, and the drive mechanism 4 is located below the leader 7, that is, the leader mast 2. If you reach the bottom of the, you cannot drill any more.

The upper end of the auger shaft 5 and the drive mechanism 4 are separated from each other, and only the drive mechanism 4 is lifted and moved to a position above the leader mast 2 to replace the auger shaft 5 with a new auger shaft 5.
It is possible to excavate even deeper by continuing the excavation by adding the auger shaft, but this auger shaft 5 requires another crane, and in the case of multiple shafts unlike the single shaft, it is necessary to add a plurality of auger shafts 5 together. Therefore, it becomes troublesome and troublesome. Moreover, the upward movement of the drive mechanism 4 causes the center of gravity to move to a high place, and thus there is a problem in stability.

On the other hand, as shown in FIG. 8, the vicinity of the connecting portion of the auger shaft 5 to the drive mechanism 4 is used as a slide mechanism 11 with a hydraulic cylinder or a double pipe, and the extension amount of the slide mechanism 11 is sufficient. Some have made it possible to continue excavation.

The replenishment method using the auger shaft 5 is not appropriate for the additional depth of the auger shaft 5 and is not appropriate when a little more digging is needed for rooting, etc. , Its length is limited,
In addition, the mechanism becomes complicated.

The object of the present invention is to eliminate the disadvantages of the conventional example, and to excavate a deeper depth than the leader length without providing a special mechanism on the auger shaft or the like, and simply and inexpensively. It is to provide an underground continuous wall construction method using a multi-axis auger capable of increasing the construction depth and doubling the stability.

[0013]

In order to achieve the above object, the present invention provides a multi-spindle auger in which a drive mechanism in which an auger shaft is connected downward is suspended from a top sheave of a leader mast standing on a base machine. It is used to discharge solidifying liquid such as cement milk from the auger head during excavation with this multi-axis auger and mix it with in-situ soil in the soil to create a one-element soil cement wall body. In the underground continuous wall construction method in which each element of the constructed soil cement wall is completely wrapped to form a wall body integrally connected, the multi-axis auger engages its drive mechanism with the leader of the leader mast, If it reaches the bottom of the leader mast, it will be disengaged from the leader mast, and only the wire suspension will be operated to further descend and continue excavation. The one in which the subject matter of the present invention.

[0014]

According to the present invention, the multi-axis auger disengages the leader mast when it reaches the bottom of the mast,
The operation is continued only by suspending the wire and further descending to continue the excavation.However, since the auger axes of the multi-axis auger are mutually reversed, the whole does not rotate even in such a suspended state and it is relatively stable. Keep the state. In addition, since the wire can be freely extended, there is no limit to the depth for continuing excavation.

[0015]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 to 3 are side views of respective steps showing an embodiment of an underground continuous wall construction method using a multi-axis auger of the present invention, and the same components as those of FIGS. 5 to 7 showing the conventional example have the same reference numerals. Is attached.

The multi-axis auger used in the present invention has almost the same construction as the conventional one, and the auger portion is formed by connecting the auger shaft 5 downward to the drive mechanism 4 including a hydraulic motor and a speed reducer. In addition, a plurality of auger shafts 5 (three in the drawing) are arranged in parallel, and the auger head 5 is attached to the tip.
a is provided, and a screw blade 5b and a stirring blade 5 are provided on the way.
c is provided.

The driving mechanism 4 of the auger is suspended by a wire from the top sheave 3 of the leader mast 2 standing upright on the base machine 1 such as a crawler with the auger shaft 5 connected, and the driving mechanism 4 is rear surface. The curved bracket 6 provided in the above was engaged with the leader 7 provided along the leader mast 2.

In the present invention, it is desirable that the curved bracket 6 can be easily attached to and detached from the drive mechanism 4, and can be separated by a bolt 9 or the like as shown in FIG.

Further, a neck shackle-shaped steady rest 8 is provided at the lower end of the leader mast 2. The steady rest 8 removes the auger shaft 5 passing through the inside thereof and does not interfere with the passage of the drive mechanism 4. What can be attached to and detached from the base machine 1,
Alternatively, as shown in FIG. 5, it may be of an open / close type.

In this way, the auger shaft 5 is rotationally driven by the drive mechanism 4 to excavate the auger head 5a in a conical shape. During the excavation, the auger head 5a discharges a solidified liquid such as cement milk. , Mixing with in-situ soil in soil to create one element soil cement wall.

At the time of the excavation, the multi-axis auger engages its drive mechanism 4 with the leader 7 of the leader mast 2 through the curved bracket 6 and lowers it along the leader 7, as shown in FIG. When the drive mechanism 4 reaches the lower part of the leader mast 2, the curved bracket 6 is removed and the engagement with the leader 7 is released.

As a result, the drive mechanism 4 and the auger shaft 5 connected to the drive mechanism 4 are suspended and supported only by the wire 10.

Even in this state, the driving mechanism 4 causes the auger shaft 5 to move.
When the vehicle is driven to rotate and the excavation is further continued, the drive mechanism 4 descends so as to be embedded in the ground as shown in FIG. In addition, since the multi-axis auger is such that the auger shafts 5 adjacent to each other are mutually inverted,
Even if only 10 is suspended, the whole body does not rotate and remains relatively stable. Furthermore, since the wire 10 can be freely paid out, there is no limit to the depth at which the excavation can be continued.

Since the neck shackle-shaped steady rest 8 at the lower end of the leader mast 2 interferes with the lowering of the drive mechanism 4, the steady rest 8 is opened or driven by further removing it. The mechanism 4 is passed.

[0025]

As described above, the underground continuous wall construction method using the multi-axis auger of the present invention makes it possible to easily and inexpensively excavate a depth deeper than the leader length without providing a special mechanism on the auger axis or the like. It is possible to increase the depth of construction and double the stability.

[Brief description of drawings]

FIG. 1 is one of the underground continuous wall construction methods using the multi-axis auger of the present invention.
It is a side view of the 1st step showing an example.

FIG. 2 is one of the underground continuous wall construction methods using the multi-axis auger of the present invention.
It is a side view of the 2nd step showing an example.

FIG. 3 is one of the underground continuous wall construction methods using the multi-axis auger of the present invention.
It is a side view of the 3rd step showing an example.

FIG. 4 is a plan view of a curved bracket portion.

FIG. 5 is a plan view of a steady rest.

FIG. 6 is a side view of a multi-axis auger.

FIG. 7 is a front view of a main part of a multi-axis auger.

FIG. 8 is a side view showing a conventional example.

[Explanation of symbols]

1 ... Base machine 2 ... Leader mast 3 ... Top sheave 4 ... Drive mechanism 5 ... Auger shaft 5a ... Auger head 5b ... Screw blade 5c ... Stirring blade 6 ... Curved bracket 7 ... Leader 8 ... Steady rest 9 ... Bolt 10 ... Wire 11 … Sliding mechanism

Claims (1)

[Claims] 1. A multi-axis auger in which a drive mechanism in which an auger shaft is connected downward is suspended from a top sheave of a leader mast standing upright on a base machine, and is used from an auger head during excavation with this multi-axis auger. A solidified liquid such as cement milk is discharged and mixed with in-situ soil in the soil to form a one-element soil cement wall body, and each element of the soil cement wall thus formed is completely wrapped. In the underground continuous wall construction method that constructs a wall body integrally connected with each other, the multi-axis auger engages its drive mechanism with the leader of the leader mast, and descends along the leader to reach the bottom of the leader mast. An underground continuous wall construction method using a multi-axis auger characterized by releasing the engagement with the leader, operating only in the state of suspending the wire, and further descending to continue excavation.