Excavating – Clamshell bucket – Common pivot
Patent
1996-12-05
1998-08-25
Graysay, Tamara L.
Excavating
Clamshell bucket
Common pivot
37 91, 175396, 299 60, E02F 324
Patent
active
057972028
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an excavating machine for excavating a vertical hole.
BACKGROUND ART
There have been proposed various vertical hole excavating machines for excavating deep vertical holes, such as holes for the foundations of concrete structures, holes for the foundations of steel towers, holes for the foundations of bridge piers, shafts for tunnel excavation and shafts for mines. These known excavating machines, however, require the loading work for loading excavated matter into buckets or the like at the bottom of an excavated hole, and so the deeper the excavated hole becomes, the more difficult the disposal of the excavated matter becomes, and the longer time it takes for excavating the hole.
Accordingly, it is an object of the present invention to eliminate the loading work for loading excavated matter into buckets or the like at the bottom of an excavated hole.
DISCLOSURE OF THE INVENTION
A vertical hole excavating machine in accordance with the present invention comprises a cylindrical body disposed with its axis in a vertical position, a cutter head disposed to be rotatable about the axis at the lower end of the cylindrical body, and a driving mechanism for rotating the cutter head.
The cutter head includes a first head supported to be rotatable about the axis at the lower end of the cylindrical body and having a central space vertically extending therethrough; at least one first cutter disposed on the first head to excavate earth under the first head; a second head disposed in the central space and coaxially with the first head so as to be removably inserted from above, the second head having a cylindrical portion to receive matter excavated by the first cutter therein and a bottom closing the lower end of the cylindrical portion; and at least one second cutter disposed on the second head to excavate earth under the second head. The second head is provided in the bottom with an opening or notch to receive matter excavated by the second cutter into the cylindrical portion.
The cutter head is rotated about the axis of the cylindrical body by the driving mechanism to excavate a vertical hole of a diameter substantially equal to that of the cylindrical body with the first and the second cutters while the excavating machine is subjected to a downward force, such as the own deadweight and a force exerted thereto by a thrusting device or the like.
Matter excavated by the first cutter is moved toward the central space of the first head as the cutter head rotates and, finally, the matter is received into the cylindrical portion of the second head. Matter excavated by the second cutter is received through the notch of the second head into the cylindrical portion of the second head as the cutter head rotates.
When the cylindrical portion of the second head is filled up with the excavated matter, the second head is hoisted onto the surface of the ground by a hoisting machine, such as a crane, the excavated matter contained in the cylindrical portion is dumped on the ground, and then the second head is lowered to the bottom of the hole and mounted on the first head by the hoisting machine.
Thus, according to the present invention, the second head, i.e., one of the components of excavating means, is inserted from above detachably in the central space of the first head, i.e., another component of the excavating means, and excavated matter is received in the cylindrical portion of the second head. Accordingly, the loading work for loading excavated matter into buckets or the like at the bottom of the hole is unnecessary.
Preferably, the first head or the first cutter is provided with a guide for guiding matter excavated by the first cutter into the central space as the cutter head rotates so that the excavated matter can be surely loaded into the cylindrical portion of the second head.
Preferably, the second head is further provided with a lid disposed to be angularly rotatable about a horizontal axis on the upper side of the bottom so as to open and close the notch on the u
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patent: 3480327 (1969-11-01), Matsushita
patent: 3779322 (1973-12-01), Steven
patent: 5078545 (1992-01-01), Akesaka
patent: 5470132 (1995-11-01), Cartwright
Beach Thomas A.
Graysay Tamara L.
Kabushiki Kaisha Iseki Kaihatsu Koki
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