JPH089270Y2 - Casing auger and sheath tube for gravel ground excavation - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] The present invention is used for excavating a hole for the purpose of constructing a pillar in the ground where the surface layer is a gravel layer, and especially for the ground where the surface layer is a gravel layer. The present invention relates to improvement of a casing auger.

[0002]

2. Description of the Related Art A conventional casing auger is Jikken Sho6.
No. 0-33148, Japanese Examined Patent Publication No. 61-18608, Japanese Examined Patent Publication No. 62-20334, etc., a structure in which a spiral blade is wound around the outer peripheral surface of a hollow tube to form an excavated portion is provided. The casing auger has a square shaft having a digging cone at its tip, is connected to the casing auger via a clutch mechanism, and is configured so that the casing auger can be rotated and advanced by a drive motor. is there.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the above prior art, when excavating the ground whose surface layer is a sand layer or a gravel layer with a casing auger having spiral blades, if the casing auger is removed after the excavation, the gravel layer is removed. There is a drawback that the periphery of the hole of the part collapses and the gravel falls into the hole and fills the hole, and when excavating the track, when excavating from the gravel layer above the roadbed,
Since the spiral drilling blade has a wide width and its surface is smooth, the gravel on the spiral drilling blade is carried upward as the blade rotates during the gravel layer drilling. It was not possible to excavate the gravel layer using a casing auger with spiral blades because it has the drawback of raising the gravel layer and lifting the sleepers and rails laid on the roadbed. . Therefore, when excavating the gravel layer, the gravel must first be removed manually, and then the casing auger with spiral blades must be used to excavate the labor and time, which is inefficient. There was a problem.

[0004]

SUMMARY OF THE INVENTION In view of the problem of inefficient work when excavating a gravel layer, which is based on the structural limitation of the above-mentioned prior art, the present invention provides an outer peripheral surface of a hollow pipe in a conventional casing auger. Instead of the configured spiral blades, a round rope rod is wound around the outer peripheral surface of the hollow tube to form an excavation portion, and a square shaft having a digging cone at the tip matches the hollow tube. An upper lid and a lower lid are attached and inserted into the hollow tube, the upper lid and the upper end of the hollow tube are detachably connected, and the hollow shaft is rotated by rotating the square shaft. The problem is solved by making it possible to dig.

[0005]

In the present invention having the above-mentioned structure, when the casing auger is rotated through the square shaft by the drive motor or the like when excavating the gravel layer, the gravel is wound by the round rope rod wound around the outer peripheral surface of the hollow tube. Dig without raising the layers. Then, after excavating by the thickness of the gravel layer, the rotation / digging operation is stopped, the casing auger and the square shaft are disconnected, and only the square shaft is pulled out, and the casing auger is left as it is in the gravel layer. This is used as a sheath tube. Thereafter, a conventional casing auger having spiral blades or earth auger is inserted into the remaining casing auger / sheath pipe to excavate the ground below the gravel layer.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 and subsequent drawings are embodiments of the present invention. Figure 1
In the embodiment shown in FIG. 2, a round rope (2) is spirally wound from the lower end to the upper end on the outer peripheral surface of the hollow pipe (1) whose upper and lower ends are open to form an excavated portion. The circular rope rod (2) is wound around the hollow pipe (1) so that the spiral pitch is gradually widened as it goes upward from the lower end of the hollow pipe (1). It is configured. A handle handle (3) for rotation is formed at the symmetrical position at the upper end of the hollow tube (1) and functions as a clutch mechanism with a drive angular shaft (6) described later. Further, a suspending tool (4) for hanging a hook provided on the boom of the work vehicle is provided at a symmetrical position on the outer peripheral surface of the upper end portion.

As shown in FIGS. 3 and 4, at the tip of the driving angular shaft (6) inserted into the casing auger / sheath tube (A), a digging cone (7) and the hollow tube (1) are provided. ), A lower lid (8) having a size matching the above is attached, and the excavation cone (7) and the lower lid (8) are integrally formed, and the tip of the excavation cone (7). A central shaft member (13) for guiding the excavation is attached to the. Similarly, an upper lid (10) having a size matching the hollow tube (1) is detachably attached above the square shaft (6).
0) is provided with a turning handle (9), and by engaging the turning handle (9) with the handle receiver (3) of the hollow tube (1), the upper lid (10) is It is detachably connected to the upper end of the hollow tube (1). A drive motor (12) suspended from a boom (11) of a work vehicle (not shown) is connected to the upper end of the square shaft (6) so that the drive motor (12) can freely come and go.

In the above structure, when excavating the gravel layer (5), when the drive angular shaft (6) is rotated by the drive motor (12), the rotational force is generated by the rotation handle (9) and the handle receiver. It is transmitted to the hollow pipe (1) via (3) and rotates the casing auger / sheath pipe (A), and at the same time, rotates the digging cone (7) and the lower lid (8) at the tip.
At this time, since the excavation cone (7) excavates the gravel layer (5) using the central axis rod (13) at the tip as a guide, the excavation cone (7)
The excavation direction of the casing auger / sheath pipe (A) does not become unstable. Following the digging of the digging cone (7), the casing auger / sheath pipe (A) rotates and digs in the gravel layer, but on the outer peripheral surface of the hollow pipe (1), a spiral is used instead of the conventional spiral blade. Since the round rope rope (2) is provided, it contacts the round rope rod (2) during the excavation, and the gravel (5 ') riding on the rope slides down from the round rope rod (2), It only rolls around the gravel in contact with the rod (2) and does not move upward with its rotation while riding on the round rope (2). The gravel layer (5)
During excavation, the lower lid (8) prevents the gravel from entering the casing auger / sheath pipe (A), and the upper lid (10)
Casing auger and sheath tube (A)
Does not tilt.

After the excavation into the gravel layer (5) is completed,
The engagement between the turning handle (9) and the handle receiver (3) is released, and the square shaft (6) is pulled up to the upper lid (1).
0), the lower lid (8) and the propulsion cone (7) are removed from the casing auger / sheath tube (A). Then, a casing auger or earth auger having a conventional spiral blade is replaced with the drive motor (1
It is connected to 2) and is inserted into the casing auger / sheath pipe (A) left in the gravel layer to excavate the ground below the gravel layer (5). At this time, the gravel (5 ') of the gravel layer (5) does not fall into the excavation hole due to the presence of the casing auger / sheath pipe (A).

In the above-mentioned embodiment, the excavation cone (7) and the lower lid (8) are integrally formed, but they may be separately formed. It is detachably attached to the square shaft (6). Further, the engagement means between the square shaft (6) and the central tube (1) of the casing auger / sheath tube (A) is not limited to the turning handle (9) and the handle receiver (3), but is detachably engaged. Any device having a clutch function of transmitting the rotation by rotating the shaft may be used.

[0011]

As described above, according to the present invention, the round shaft is spirally wound around the outer peripheral surface of the hollow pipe to form the excavation portion, and the square shaft having the excavation cone at the tip is formed. Since the upper lid provided and the hollow pipe were detachably engaged, the gravel that climbed on the round rope rod when excavating the gravel layer slipped off from the round rope rod as the digging proceeded, and the gravel excavated moved upward. It has an excellent effect that it does not bulge and swell on the surface of the gravel layer, and in particular it does not cause the inconvenience of pushing up the rail of the roadbed during track construction. Further, during excavation, the hollow pipe supports the peripheral side wall of the excavated hole to prevent it from collapsing, and the lower lid closing the lower end of the hollow pipe prevents the gravel from entering the hollow pipe. There is no need to be filled with. Furthermore, after excavation of the gravel layer, the square shaft and the hollow pipe are disengaged and only the square shaft is pulled out, and the casing auger / sheath pipe can be left in the gravel layer. Even when the ground under the gravel layer is excavated by the earth auger, the holes excavated in the gravel layer do not collapse, and the smooth and efficient work can be performed.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a casing auger / sheath tube of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a partial cross-sectional view of an apparatus for excavating a gravel layer using the casing auger / sheath tube of the embodiment shown in FIG.

FIG. 4 is a bottom view of the bellows 3.

[Explanation of symbols]

 A casing Auger and sheath tube 1 Hollow tube 2 Spiral round rope rod 3 Rotating handle receiver 4 Lifting tool 5 Sand gravel layer 6 Driving angular shaft 7 Drilling cone 8 Lower lid 9 Rotating handle 10 Upper lid 12 Driving motor 13 Center Shaft rod

Claims (1)

[Scope of utility model registration request] 1. A hollow steel pipe around which a round steel rod is spirally wound to form an excavation portion, and a square shaft having a digging cone at the tip thereof has an upper lid of a size matching the hollow pipe and A lower lid is attached, the square shaft is inserted into the hollow tube, the upper lid and the upper end of the hollow tube are detachably connected, and the hollow tube is rotated by rotating the square shaft. Casing auger / sheath pipe for excavation of gravel ground that enables excavation.