JPH07127366A - Swivel device for earth auger - Google Patents

Abstract

PURPOSE:To make supply of injectant to an auger screw possible for a swivel device of an earth auger even when the auger screw is attached to an external rotator where a big torque occurs, and to enable the injectant to be sent under pressure conveyance to a supply passage attached to a casing when the casing is installed. CONSTITUTION:An auger driving device 1 that drives rotatively a first rotator 2 and a second rotator 3, where a big torque occurs, in the directions opposite to each other and a first swivel device 4 provided in a position above the first rotator 2 and supplies injectant by pressure conveyance to a supply passage 2a of the first rotator 2 are provided. An auger screw 7, serving as an excavating body 20, or a cylindrical casing 11 is attached to the second rotator 3, and a second swivel device 5 is attached to the lower end of the first rotator 2 through a bearing 6. The injectant supplied by pressure conveyance to the supply passage 2a of the first rotator is sent by pressure conveyance either to a supply passage 7a of the auger screw 7 or a tubular supply passage 11a, 11b attached to the casing 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a first rotating body to which an auger screw is to be attached, and a second rotating body to which a tubular casing provided outside the auger screw and having a drilling blade at its tip is to be attached. The present invention relates to a swivel device in a double excavation type earth auger that excavates by rotationally driving and in opposite directions.

[0002]

2. Description of the Related Art A double excavation type earth auger will be described with reference to FIG. 5. Reference numeral 51 is a boom mounted on a self-propelled vehicle so as to be swingable and can be raised and lowered, 52 is a leader bracket fixedly mounted on the upper end of the boom, and 53. Is an upper swivel seat rotatably attached to the leader bracket, 54 is a reader attached to the lower part of the upper swivel seat, and an auger drive device 55 is provided on one side of the reader 54 and an inner side driven by the auger drive device. An auger screw 57, an outer cylindrical casing 58, and a hammer 59 for striking a pile are attached to the other side.

An auger screw 57 and a cylindrical casing 58 having a digging blade at its tip are provided with an auger drive device 55.
Are fixedly mounted on the shaft and are driven to rotate in opposite directions by the same drive source. The outer tubular casing 58 is generally an inner auger screw 57 to allow for the drilling of solid ground such as concrete.
Therefore, when the upper layer is relatively soft and the lower layer is hard, for example, the inner auger screw 7 is preceded to excavate to some extent, and then the outer layer Excavation will continue with the tubular casing 58. Auger screw 5
A swivel device (not shown) is provided on the upper side of the rotating body to which 7 is attached, and the infusate is pressure-fed to a feed passage formed through the center of the rotating body.

[0004]

By the way, depending on the condition of the ground, it is necessary to excavate the auger screw with a large torque. In such a case, a means for attaching an auger screw to the rotating body of the outer cylindrical casing having a large torque via an adapter to make it compatible can be considered. However, if the auger screw is attached to the rotating body of the outer cylindrical casing in this way, the inner and outer rotating bodies rotate in opposite directions, so that the auger screw penetrates through the shaft of the auger screw. There is a problem that the infusate cannot be pressure-fed to the feeding path.

On the other hand, when a cylindrical casing is attached to the outer rotating body having a large torque and the tip of the excavating blade is used for excavation, conventionally, the injecting agent is pressure-fed to the inner auger screw through a feeding passage. However, since there was no means for supplying the infusate on the casing side, even if an attempt was made to inject the infusate along with excavation by the casing, there was a problem that the request could not be met. there were.

The present invention solves the above-mentioned drawbacks of the prior art and penetrates the shaft of the auger screw even when the auger screw is attached to the rotating body for rotating the outer casing having a large torque through the adapter. Injectant can be pressure-fed to the feed passage formed by the above.On the other hand, even if this auger screw is removed and a cylindrical casing is attached, the feed passage is provided in the casing until it reaches the tip. An object of the present invention is to provide an earth auger swivel device capable of injecting an injecting agent with excavation by a casing.

[0007]

In order to achieve the above object, the present invention is set so that a large torque acts on the first rotating body (2) and the first rotating body. An auger drive device (1) for driving the second rotating body (3) to rotate in mutually opposite directions, and an auger drive device (1) provided on the upper side of the first rotating body (2), and the center of the first rotating body First swivel device for pressure-feeding the infusate to a feed passage (2a) formed through the portion
(4), the excavation body 20, the excavation body 20,
Specifically, the auger screw (7) or the cylindrical casing (11) is attached, and the feed passage of the first rotating body (2) is provided at the lower end of the first rotating body (2). The infusate that has been pressure-fed to (2a) is formed by penetrating the shaft of the auger screw (7) to form a feed passage (7a) or a cylindrical casing (1
A swivel device for an earth auger, characterized in that a second swivel device (5) for pressure-feeding to a tubular feeding path (11a, 11b) attached to 1) is attached via a bearing (6). Configured.

[0008]

The injectant, which has been pressure-fed by the first swivel device to the feed passage formed through the central portion of the first rotating body, passes through the shaft of the auger screw by the second swivel device. And is fed to a tubular feeding passage that is attached to a tubular casing.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 is a front sectional view of a swivel device for an earth auger showing a first embodiment of the present invention, FIG. 2 is a side sectional view of a main part of FIG. 1, and FIG. 3 is a partially cutaway plan view of FIG. 1 to 3, the auger drive device 1 has a first rotating body 2 and a second rotating body 3 which are rotationally driven in opposite directions by the same drive source. Second rotating body 3
Is set so that a larger torque is exerted than that of the first rotating body 2. No. 1 on the upper side of the auger drive unit 1.
The swivel device 4 is provided, and an injecting agent such as cement milk, cement mortar, air, or water is supplied from a supply source (not shown) to the feeding path 2a formed by penetrating the central portion of the first rotating body 2. Is being pumped.

A shaft 2c is fixed to the flange portion 2b at the lower end of the first rotating body 2. Then, the second swivel device 5 is attached to the shaft 2c via a bearing 6 (see FIG. 2). The shaft 2c of the first rotating body 2 extends inside the second swivel device 5 to transfer the infusate sent from the first swivel device 4 via the feeding path 2a to the second swivel device. The device 5 is reached.

On the other hand, in the second rotating body 3, a cylindrical coupling 3b is mounted on the flange portion 3a thereof, and a flange adapter 3d is fixed to the flange portion 3c at the lower end thereof.
The auger screw 7, which is the excavation body 20, is vertically installed on the flange adapter 3d. Therefore, the auger screw 7 is attached to the second rotating body 3 on which a large torque acts.

The injectant, which is pressure-fed by the second swivel device 5 in response to the injectant fed through the feed passage 2a of the first rotating body 2, is inverted T-shaped at its lower end. It is divided into two directions by the first joint member 8 formed in the mold, and reaches the two discharge ports 8a and 8b. The second swivel device 5 is fixedly attached to the second rotating body 3 that is rotating in the opposite direction of the first rotating body 2, that is, the coupling 3b, and integrally rotates.

The flange adapter 3d at the lower end of the second rotating body 3 is formed in a T shape and has two receiving ports 9a, 9b.
The second joint member 9 having the above is attached, and the through hole 9c bored in the central portion of the second joint member 9 is communicated with the feeding passage 7a formed through the central portion of the auger screw 7.

Two grout hoses 10 are provided between the two outlets 8a and 8b of the first joint member 8 and the two inlets 9a and 9b of the second joint member 9.
They are connected by a and 10b. As a result,
The injectant pumped by the second swivel device 5 is
From the joint member 8 through the second joint member 9 to the feed path 7a of the auger screw 7 and the lower end portion thereof is supplied to the ground being excavated.

Next, FIGS. 4A and 4B are a front sectional view of a swivel device for an earth auger and a transverse sectional view of a casing part according to a second embodiment of the present invention. In the second embodiment, a second swivel device 5 is attached to a shaft 2c at the lower end of the first rotating body 2 via a bearing 6, and the swivel device 5 has two discharge ports 8a and 8b. The point that the joint member 8 is provided and the point that the cylindrical coupling 3b is attached to the second rotating body 3 has the same configuration as that of the first embodiment.

In the second embodiment, instead of the flange adapter 3d in the first embodiment, the excavating blade is directly attached to the bottom end of the cylindrical coupling 3b instead of the flange adapter 3d in the first embodiment. A tubular casing 11 having the same is attached. The casing 11 has two tubular feed passages 11 at positions symmetrical with respect to the axis line on the outer circumference thereof.
a and 11b are linearly added and reach the tip of the casing 11.

Between the two discharge ports 8a and 8b of the first joint member 8 and the two tubular feed passages 11a and 11b attached to the casing 11, two grout hoses 10a, They are connected by 10b.
As a result, the infusate that is pressure-fed by the second swivel device 5 is supplied from the first joint member 8 via the feed paths 11a and 11b of the casing 11 to the ground being excavated from its lower end. Will be done.

Incidentally, the shaft 2c is removed from the flange portion 2b of the first rotary body 2 together with the second swivel device 5, and the cylindrical coupling 3b is removed from the flange portion 3a of the second rotary body 3. If an auger screw is attached to the flange portion 2b of the first rotating body 2 and a tubular casing is attached to the flange portion 3a of the second rotating body 3, it can be used as a double excavation type earth auger as in the conventional case. Of course.

[0019]

According to the present invention described above, the injectant that has been pressure-fed by the first swivel device to the feeding path formed through the central portion of the first rotating body is supplied to the second swirling device. The swivel device guides the auger screw to the feed passage formed through the shaft of the auger screw or the tubular feed passage attached to the tubular casing. It can be rotated and excavated by the body, and the injectant can be pumped to the auger screw by the second swivel device. Further, in the case where the casing is mounted, there is an effect that the tubular feed passage provided on the outer side of the casing is connected to the second swivel device, and the infusate can be pressure-fed to the tip portion of the casing.

[Brief description of drawings]

FIG. 1 is a front sectional view of an earth auger swivel device according to a first embodiment of the present invention.

FIG. 2 is a side sectional view of a main part of FIG.

3 is a partially cutaway plan view of FIG. 2. FIG.

4 (a) and 4 (b) are a front sectional view of a swivel device for an earth auger and a transverse sectional view of a casing part, showing a second embodiment of the present invention.

FIG. 5 is a side view of a conventional double excavation-type earth auger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Auger drive device 2 ... 1st rotary body 2a ... Feeding path 2c ... Shaft 3 ... 2nd rotary body 3b ... Coupling 3d ... Flange adapter 4 ... 1st swivel device 5 ... 2nd swivel device 6 ... Bearing 7 ... Auger screw 7a ... Feed passage 8 ... First joint member 8a, 8b ... Discharge port 9 ... Second joint member 9a, 9b ... Receiving port 10a, 10b ... Grout hose 11 ... Casing 11a, 11b ... Feeding route 20 ... excavated body

Claims (3)

[Claims] 1. A first rotating body (2) and a second rotating body which is set so as to exert a large torque as compared with the first rotating body.
An auger drive device (1) for rotating the rotating body (3) of the first rotating body in opposite directions to each other, and an auger driving device (1) provided on the upper side of the first rotating body (2). A first swivel device (4) for pressure-feeding the infusate to a feed passage (2a) formed therethrough.
And the excavation body (20) is attached to the second rotating body (3), and the feeding path (2a of the first rotating body is provided at the lower end of the first rotating body (2). ), A second swivel device (5) for pumping the infusate pumped to the excavation body (20) to a feed passage provided in the excavation body (20) is mounted via a bearing (6). Earth auger swivel device. 2. The auger screw (7) attached to the second rotating body (3) is an auger screw (7), and the injectant sent under pressure to the feed passage (2a) of the first rotating body (2) is The swivel device for an earth auger according to claim 1, wherein the swivel device is pressure-fed to a feeding path (7a) formed by penetrating the shaft of the auger screw (7). 3. The excavating body attached to the second rotating body (3) is a cylindrical casing (11) having an excavating blade at its tip, and the feed path (2a) of the first rotating body (2). 3. The swivel device for an earth auger according to claim 1, wherein the infusate sent under pressure to the tubular auger is sent under pressure to the tubular feed passages (11a, 11b) attached to the tubular casing (11). .