JP2006009538A - Excavating bit and excavating head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an excavating bit hardly chipped and having moderate biting property in excavating the hard ground, a concrete pile, or the like, and to provide an excavating head preventable from escape caused by the tip deviation of a working rod in crushing treatment of the concrete pile or the like. <P>SOLUTION: A flank of a tip mounted to the excavating bit is formed in circular arc shape, and an angle defined by the flank and a rake face is 90° plus or minus 10°, wherein the rake face is formed in gentle chevron shape. A plurality of excavating bits are mounted to the rod side face of the excavating head or the tip part of the excavating head. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a plurality of excavation bits mounted on a side surface of a rod and a tip end of an excavation head for excavating hard ground or a concrete pile, and an excavation head using the bit.

  A conventional excavation bit mounted at the tip of an excavation head when excavation work is performed with an earth auger or the like, for example, as disclosed in Japanese Utility Model Laid-Open No. 59-121090, Are generally used in a mountain shape (FIG. 3) or a straight shape (FIG. 6) (see FIG. 5).

  For excavation of the normal ground, either shape can be used, but for excavating hard ground such as concrete and rock, the mountain type has a high surface pressure and good bite, but it has the disadvantage of being easily chipped. Is difficult to chip, but the surface pressure is low and the biting performance is inferior.

  In addition, there are conical types of excavation bits for excavating hard ground, but the conical tip is subject to early wear and breakage and needs to be replaced midway. ing. (See Patent Document 1)

  Further, in crushing processing of concrete piles or the like, the excavation head sometimes shakes during crushing, and there is a case where the crushing processing cannot be performed due to bending due to the escape. For this reason, in general, the casing and the auger screw are positioned concentrically with the concrete pile buried in the ground, and the concrete pile portion is placed at the tip of the auger screw while the casing is always preceded and excavated around the concrete pile. The auger screw is prevented from shifting from the axial center by crushing with the excavating bit installed. (See Patent Document 2)

However, the method using the casing together has a drawback that the apparatus becomes large and the operation cost increases.
JP 2002-013376 A JP 2001-003363 A

  As a means for solving the above-mentioned problems, the present invention provides a drilling bit that does not easily have a bit for excavation in excavation of hard ground, concrete pile, etc., and an excavation head in crushing treatment of concrete pile or the like that has moderate biteability. An object of the present invention is to provide a working rod capable of preventing escape due to the deflection of the tip.

  The flank of the chip mounted on the excavation bit is formed in an arc shape, the angle between the flank and the rake face is 90 ° plus or minus 10 °, and the rake face is formed into a loose mountain shape. It is in the excavation bit which is the feature.

  Further, the excavation head is characterized in that a plurality of excavation bits according to claim 1 are mounted on the rod side surface of the excavation head or the excavation head tip.

  In excavation of hard ground, concrete piles, etc., the flank face of the chip is formed in an arc shape, so that it is harder to chip than a mountain shape, and an appropriate amount of biting performance corresponding to the excavation target can be obtained.

  In addition, the angle between the flank and the rake face is 90 ° plus or minus 10 °, and the rake face is a loose mountain shape. Therefore, it is possible to prevent the phenomenon of entanglement and the like from occurring and to perform efficient construction.

  In excavation of concrete piles, etc., by mounting a plurality of the bits on the side of the rod of the excavation head and the tip of the excavation head, the excavation head tip is softer than the central space or pile of the concrete pile or the like The excavation bit mounted on the side of the rod of the excavation head crushes the concrete pile and the like, causing the excavation head tip to shake, There is no such thing as bending due to escape and crushing.

  The present invention will be described below with reference to embodiments shown in the drawings.

  FIG. 1 shows an embodiment of an excavation bit 1 according to the present invention. A flank N of a chip 2 mounted by brazing on a shank portion 3 of the excavation bit 1 is formed in an arc shape, and the flank The angle G formed by N and the rake face S is 90 ° plus or minus 10 °, and the rake face S is formed into a loose chevron with T at the top.

  2 and 3 show an embodiment of the excavation heads 5 and 5 'on which the excavation bit 1 of the present invention is mounted, and the work rod 5 of FIG. 1, 1, 1 are attached by welding via a bit holder 4, and three excavation bits 1, 1, 1 are welded to the side surface of the rod of the excavation head 5 in a stepped manner via the bit holder 4. And each excavation trajectory is slightly overlapped to cover a predetermined excavation surface.

  Further, the excavation head 5 ′ of FIG. 3 has an excavation lifting screw blade 7 mounted on the head 5 ′, and five excavation bits 1, 1, 1, 1 at the tip thereof. 1 is attached by welding via a bit holder 4, and each excavation locus is arranged to overlap slightly to cover a predetermined excavation surface.

  FIG. 4 is a schematic diagram showing an embodiment of the crushing head 5 ″ for the concrete pile 8 or the like, and excavation that proceeds in advance in the central space of the concrete pile 8 or the softer filler than the concrete pile 8. Three excavation bits 1, 1, 1 are attached to the tip of the head 5 "by welding via a bit holder 4, and the excavation trajectories slightly overlap to cover a predetermined excavation surface. Are arranged to be.

  Then, five excavation bits 1, 1, 1, 1, 1 are attached to the side surface of the rod of the excavation head 5 ″ at a distance from the tip portion via a support plate 6 by welding. These excavation bits 1, 1, 1, 1, 1 are also arranged so as to slightly overlap the excavation trajectory and cover a predetermined excavation surface, and the innermost bit is the outermost bit of the tip bit The excavation locus is slightly overlapped.

  Next, the operation of the embodiment will be described with reference to FIGS.

  An excavator (not shown) such as an earth auger sets the tip of the working rod 5, 5 ', 5 "at the center of the hard ground or the concrete pile 8 to start excavation. ... is because the flank of the tip 2 ... mounted on the excavating bit 1 ... is shaped like an arc, so it is harder to chip than the chevron, and an appropriate amount of biting performance suitable for the object to be excavated Is expressed and excavation is possible.

  The angle G formed between the flank N and the rake face S is 90 ° plus or minus 10 °, and the rake face is formed into a loose mountain shape, so that even if the concrete pile 8 or the like includes a reinforcing bar, the shearing effect Therefore, it is possible to prevent a phenomenon such as entanglement that hinders excavation and to perform efficient construction.

  In the crushing process of the concrete pile 8, as shown in the schematic diagram of FIG. 4, first, the tip of the excavation head 5 ″ is set at the center of the concrete pile 8, and excavation is started. The tip of the head 5 "is advanced in advance in the space in the center of the concrete pile 8 or in a softer packing than the pile, and it is used as a guide and mounted at a distance from the tip of the excavation head 5" Since the concrete pile is crushed from the time when the excavation bit 1 on the side of the rod reaches the concrete pile 8, the working rod 5 "is shaken and the bend is caused by the escape and the concrete pile is There is no loss of crushing.

  Front view (1-1), rear view (1-2), plan view (1-3), bottom view (1-4), side view (1-5) showing an embodiment of the excavation bit in the present invention .   The side view (2-1) which shows one Embodiment of the working rod which uses the excavation bit in this invention, front view (2-2), A arrow front view (2-3) of (2-1).   The side view (3-1) and front view (3-2) which show other embodiment of the working rod using the excavation bit in this invention.   The schematic diagram which shows one Embodiment of the pile excavation rod which uses the excavation bit in this invention.   3 and 6 of Japanese Utility Model Publication No. 59-121090.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Excavation bit 2 Tip 3 Shank part 4 Bit holder 5, 5 ', 5 "Excavation head 6 Support plate 7 Screw blade 8 Concrete pile G Elevation angle S Rake face N Relief face T Apex

Claims (2)

  In excavation bits for excavating hard ground, concrete piles, etc., the flank of the chip mounted on the bit is formed in an arc shape, and the angle between the flank and the rake face is 90 ° plus or minus 10 °. An excavation bit characterized by having a rake face with a loose chevron shape.   An excavation head for excavating a hard ground yak concrete pile or the like, wherein a plurality of excavation bits according to claim 1 are mounted on the rod side surface or the tip head of the excavation head.

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