JP2935076B2 - Excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth auger excavator which can be used for construction of a soil cement water stop wall or earth retaining wall, continuous pre-boring at the time of press-fitting steel sheet pile, large-diameter ground improvement work, and the like.

[0002]

2. Description of the Related Art An earth auger is a device for repeatedly drilling an auger screw into the ground, pulling it out, and discharging the earth to a predetermined depth. As the earth auger, a single-shaft type using one auger screw or a multi-shaft type using a plurality of auger screws is appropriately used according to the construction purpose or the like. The single-shaft type has a structure in which one auger screw is suspended from a driving device, and the multi-shaft type has a structure as shown in FIGS. FIG. 6 shows a structure in which a plurality of (for example, three) auger screws b are suspended in a driving device a. FIG. 7 shows a case in which a casing c is suspended in a driving device a, and a rotary spindle d is inserted into the casing c. , The tip of the rotating main shaft d is branched into a plurality of auger screws b.

[0003]

SUMMARY OF THE INVENTION The above prior arts include:
The following problems exist. <A> The earth auger is appropriately selected from a single-shaft type and a multi-shaft type according to the construction purpose and the like. Therefore, it is desirable that both a single-axis drilling and a multi-axis drilling can be performed by one apparatus. Therefore,
There is a need for an apparatus that can easily change between one axis and multiple axes. In the case of the conventional multi-shaft type shown in FIGS. 6 and 7, a gear box e is provided below the driving device a or the rotating main shaft d, and the rotation of the driving device a or the rotating main shaft d is transmitted to the auger screw b via a plurality of gears. It is a structure for transmitting. Therefore, in order to change to the single-shaft type, it is necessary to modify the drive device a or the gear box e, and it is not possible to easily change the drive device a or the gear box e. <B> Further, since each auger screw b is fixed by meshing of a gear, it is difficult to change the pitch between the auger screws b. Incidentally, the wall thickness of the underground retaining wall varies depending on various conditions such as the depth of the underground structure, the state of the ground, the water level, the earth pressure, and the like. This may be different even in the same construction site, and if the wall thickness cannot be changed in response to the above-mentioned conditions each time, problems arise in safety, economy, and the like. However, in the conventional multi-axis device, it is difficult to change the pitch between the auger screws b, so that it is impossible to cope with the change in the wall thickness. Therefore, excavation is made thicker with emphasis on safety, and uneconomical construction is often performed. <C> It is necessary to provide the gear box e, which complicates the structure of the device. In particular, the device shown in FIG. 7 has a problem in water stoppage of the gear box e. <D> In the case of multi-axis drilling, individual auger screws b
However, the construction efficiency can be improved if it can be independently rotated in any direction and at any speed according to the excavation situation or the properties of the ground. However, in the conventional device, since each auger screw b rotates in conjunction with a gear,
The individual auger screws b cannot independently rotate in any direction and speed.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a rotatable casing which is suspended by a driving device. It consists of a main excavator in which the auger screw to be inserted is inserted and a drilling head is attached to the tip of the auger screw, and a sub-excavator having a rotating shaft that hangs down from a hydraulic motor and a drilling head attached to the tip of this rotating shaft. the main excavator and sub excavator, the said rotation axis the is possible combined by parallel and auger screw, and a removable, and said rotary shaft Augustine
It is an excavator that is configured to be able to adjust the mounting interval with the screw . In addition, a rotatable cable hanging by the drive
Oscillating and drilling in this casing
Insert the auger screw and excavate it at the tip of the auger screw.
A main excavator with a milling head,
It has a flange for connection, and the axis is
The connecting pipe placed almost vertically and the outer surface of the connecting pipe
The first holding arm whose length can be adjusted in a substantially horizontal direction
Arm and a hydraulic motor attached to the free end of the first holding arm.
And a rotating shaft that hangs down from the hydraulic motor.
Sub drilling machine with drilling head attached to the tip of the turning shaft and more
The main excavator and the sub excavator are the rotating shaft and the
Can be combined with an auger screw in parallel, and
An excavator configured to be removable . Also,
In the excavator, the rotating shaft is rotated below the rotating shaft.
And a length-adjustable second holding arm.
Mount in a substantially horizontal direction, with a free end on the second holding arm.
With an excavator equipped with a connecting plate to connect with the
There is .

[0005]

Embodiments of the present invention will be described below with reference to the drawings. <A> Overall Structure of Excavator (FIG. 1) The excavator of the present invention is an earth auger excavator including a main excavator A and a sub-excavator B as shown in FIG. The excavator is mounted so as to move up and down along a leader vertically held by a crawler crane or a truck crane. It should be noted that various other means for mounting the excavator are conceivable.

<B> Main Excavator (FIG. 3) The main excavator A has a drive unit 11 and a press-fit jack 12 mounted on a gantry 1, and a casing 2 is suspended from the drive unit 11. The casing 2 is configured to be rotatable by a rotating device 13 provided below the driving device 11.
The rotating device 13 is a known device including a hydraulic motor and a lock mechanism. Further, since the casing 2 is suspended from the drive unit 11 by bolting the flanges 21 and 22 at the upper portion, the casing 2 can be easily attached and detached. Further, a bolt hole 2 for attaching a connecting plate of a sub-excavator to be described later is provided at a predetermined position in a lower portion of the casing 2.
3 is established. An auger screw 3 is inserted into the casing 2 for hanging and excavating from the driving device 11. A lower end of the auger screw 3 is equipped with an excavating head 31. As described above, the main excavator A
Flanges 21 and 22 or bolt holes 2
Since only simple processing such as 3 is performed, an existing uniaxial auger can be used.

<C> Sub-excavator (FIGS. 2, 4, and 5) The sub-excavator B is configured to be detachable from the main excavator A. First, as shown in FIGS. 2 and 4, flanges 41 and 4 for connecting with the main excavator A are provided at both ends.
The connecting pipe 4 provided with 2 is disposed with the axis thereof oriented substantially vertically. Bolt holes 43 are formed in the flanges 41 and 42. Next, a holding arm 5 having an adjustable length, which extends substantially horizontally from the outer surface of the connecting pipe 4 is provided. As the length adjusting means of the holding arm 5, for example, as shown in FIG.
The holding arm 5 is divided in the middle, flanges 51 and 52 are attached to the respective ends, bolt holes 53 are opened, and a spacer 55 having a bolt hole 54 opened in a steel plate or the like is interposed between the flanges 51 and 52, and bolted. And spacer 55
It is conceivable to provide a length adjusting unit 56 that adjusts the length by changing the number of sheets. Next, as shown in FIG. 2, a hydraulic motor 6 is attached to the free end of the holding arm 5, and the rotary shaft 7 is suspended from the hydraulic motor 6. An excavating head 71 is mounted on the tip of the rotating shaft 7, and a plurality of stirring blades 72 are protruded above the excavating head 71. Also,
The rotating shaft 7 is formed in a hollow, and a swivel 7
An injection pipe 74 is communicated via 3 so that a soil conditioner or the like can be injected from the tip. Next, a holding arm 8 whose length can be adjusted is also attached to the lower part of the rotating shaft 7 in a substantially horizontal direction. As shown in FIG. 5, the holding arm 8 has a holding portion 81 that holds the rotating shaft 7 rotatably at one end.
An arc-shaped connecting plate 82 for connecting to the main excavator A is provided at the free end. In connection with the main excavator A, the bolt holes 83 formed in the connecting plate 82 are aligned with the bolt holes 23 formed in the lower part of the casing 2 so as to perform bolt joining. The length adjusting means of the holding arm 8 constitutes a length adjusting portion 84 similar to that described above, and the flanges 85 and 8 bolted to each other are provided.
This is performed by changing the number of spacers 87 interposed between the six.

<D> Combination of main excavator and sub-excavator (FIG. 1) In combination of main excavator A and sub-excavator B, first, flanges 21 and 22 at the upper part of casing 2 are separated and casing 2 is pulled out. Next, the connecting pipe 4 of the sub-excavator B is externally mounted on the auger screw 3 and the flanges 21 and 41 are joined by bolts. Next, the pulled-out casing 2 is again covered with the auger screw 3, and the flanges 42 and 22 are joined by bolts. At this time, the auger screw 3 is extended by extending the connecting pipe 4 by the length thereof. On the other hand, the connecting plate of the holding arm 8 is attached to the lower part of the casing 2. Thereby, the main excavator A and the sub excavator B can be combined with the rotary shaft 7 and the auger screw 3 in parallel, and the multi-shaft type can be changed. When changing to the single-shaft type, the main excavator A and the sub-excavator B may be dismantled in the reverse manner. Although the above embodiment has been described with respect to the triaxial type, the present invention can be similarly applied to a biaxial type or a quadriaxial type or more.

[0009]

[Drilling method] Next, a drilling method using the above-configured apparatus will be described. <B> Drilling Lift the excavator with a crawler crane or the like, and drive 11
The auger screw 3 and the rotating shaft 7 are rotated by the operation of the hydraulic motor 6, and the excavator is lowered to perform excavation. At this time, the auger screw 3 is maintained vertical by the casing 2 and the rotating shaft 7 is maintained vertical by the holding arms 5 and 8, so that straight excavation can be performed.

<B> Corner Drilling When excavating a corner portion, the excavation is performed as described above, and after raising from the drilled hole, the casing 2 is rotated integrally with the rotating shaft 7 by the rotating device 13 to excavate. This is made possible by performing a similar excavation after changing the direction.

[0011]

Since the present invention has been described above, the following effects can be obtained. <A> The earth auger of the present invention does not have a gear structure as in the prior art, and is composed of a main excavator and a sub-excavator, and simply attaches and detaches a connecting pipe and a connecting plate of the sub-excavator to a casing of the main excavator. The change between the single-shaft type and the multi-shaft type can be easily performed. Therefore, it is possible to perform both uniaxial drilling and multiaxial drilling with one device. <B> Since the main excavator merely performs simple processing such as flange or bolt holes on the casing, an existing single-shaft auger can be used. <C> The pitch between the auger screw and the rotating shaft can be arbitrarily changed by changing the width of the length adjusting portion of the holding arm. Therefore, the wall thickness can be easily changed according to various conditions such as the depth of the underground structure, the state of the ground, the water level, the earth pressure, and the like. Therefore, safe and economical construction can be performed. <D> No gearbox is required, and the structure of the device is simple. <E> The rotating shaft of the sub excavator is rotated by hydraulic motors individually mounted. Therefore, each rotating shaft can be independently rotated in an arbitrary direction and at an arbitrary speed according to the excavation condition or the properties of the ground, and the construction efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a combined state of an excavator according to the present invention.

FIG. 2 is an explanatory view of a sub excavator.

FIG. 3 is an explanatory view of a main excavator.

FIG. 4 is an explanatory view of an upper part of a sub excavator.

FIG. 5 is an explanatory view of a lower part of the sub excavator.

FIG. 6 is an explanatory view of a conventional device.

FIG. 7 is an explanatory view of a conventional device.

Claims (3)

(57) [Claims] 1. A main excavator having a rotatable casing suspended by a drive device, into which an auger screw for rotary excavation is inserted, and an excavating head attached to the tip of the auger screw, and a hydraulic motor. It has a rotating shaft that hangs down, and consists of a sub-excavator with a drilling head attached to the tip of the rotating shaft, and the main excavator and the sub-excavator can be combined with the rotating shaft and the auger screw in parallel. Yes and removable and front
Adjust the installation interval between the rotating shaft and the auger screw.
Excavator configured to be adjustable . 2. A rotatable case suspended by a driving device.
Auger that has rotary
Insert the screw and drill into the tip of the auger screw.
Main excavator with pad mounted and connected to main excavator
Has a flange for making the axis line almost lead from the flange.
A connecting pipe arranged in a vertical direction, and roughly from the outer surface of the connecting pipe
Adjustable length first holding arm extending horizontally
And a hydraulic motor attached to the free end of the first holding arm
And a rotary shaft that hangs down from the hydraulic motor.
A sub-excavator with a drilling head attached to the tip of
The main excavator and the sub-excavator have the rotating shaft and the
Can be combined in parallel with the
An excavator configured to be removable . 3. The excavator according to claim 2 , wherein the rotary shaft is rotatably held at a lower portion of the rotary shaft and is long.
Adjustable second holding arm is attached in a substantially horizontal direction,
The free end of the second holding arm connects with the main excavator
Excavator with a connecting plate for the excavator .