JPH0359296A - Excavating direction easily correctable excavating method using ring bit and ring bit - Google Patents

Abstract

PURPOSE:To improve workability with inexpensive construction by setting the fitting angle of bits on one periphery of a ring bit excavating the hard ground outward, straightly excavating the ground at the speed of the peripheral speed or above, and correcting the direction with the oscillating rotation in the specific angle range. CONSTITUTION:Bits 2 of a ring bit 1 are divided into four, only a bit train A on one periphery is fitted outward, a bit train B on the opposite side is fitted inward, and other bits are fitted normally straightly. The ring bit 1 is rotated 360 deg. or above for normal rotation, and a base rock 3 is straightly excavated. When a direction change is required, the outward bit train A is located in the correction direction, the oscillating rotation motion is performed at the angle + or -45 deg. to obliquely excavate. After the direction change, it is again rotated 360 deg. or above to be returned to straight excavation. The excavating direction is quickly and easily corrected during excavation, and workability can be sharply improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in an excavation method for excavating hard ground such as rock using a ring bit.

(Prior Art) A conventional ring bit has a plurality of bits attached straight to the tip of a tube. A blow or pressing force is applied to this ring pit and it is rotated to cut and excavate the hard ground with the bit at the tip.

(Problems to be Solved by the Invention) The conventional method of excavating using a ring bit only excavates in a straight line, and it is not possible to change the excavation direction during excavation. For this reason, it was often necessary to re-excavate from the beginning or halfway.

An object of the present invention is to provide an excellent excavation method using a ring bit in which the direction of excavation can be changed during excavation.

(Means for Solving the Problems) The gist of the present invention that solves the problems is as follows: 1) A ring bit with a plurality of bits attached to the periphery of the pipe tip is rotated while applying impact or pressing force to the hard ground. In an excavation method for excavating a hole, a ring bit is used which is installed so as to be tilted outward from the focusing row at one edge of the group of bits at the tip, and the ring bit is rotated at least 3,600 times or more at the same time. The hard ground is excavated in a straight line by being applied to the hard ground, and when changing the direction of excavation, the ring bit is positioned in the direction of drilling to correct the outward bi-sotho row, and then the ring bit is focused around this phase. A method for easily correcting the excavation direction using a ring bit, which is characterized by changing the excavation direction by giving a rotational motion in a narrow angle range to the pipe. A ring binoto method characterized by being installed with an outward tilt. 2) Ring bit 4 according to claim 2, wherein the bits in one peripheral bit row of the bits installed at an angle to the circumference of the pipe tip are installed at an inclination toward the inner side of the ring bit> Other than the bit rows installed at an outward angle. In the ring bit according to claim 2, the bit is installed straight.

(Function) According to the present invention, when a ring bit is used to excavate in a straight line, the ring bit may be rotated by 3600 degrees or more to apply a striking or pressing force.

If the ring bit is rotated more than 360 degrees, the outward-facing bit will work 3600 degrees uniformly against the drilling wall of the excavated ground, allowing drilling in a perfect circle centered on the center axis of rotation of the ring bit. It is excavated straight in the direction. Next, if you want to modify the excavation direction in either the forward/backward (up/down) or left/right direction, position the outward bit row in the direction of change, and rotate at a narrow angle of about ±45° around this position. Rotate the ring bit. This causes a difference in the resistance from the ground that the bit experiences between the outward-facing bit and the other bits, which generates a thrust force in the direction of the outward-facing bit, causing the ring bit to gradually turn in that direction. It is something that will be excavated. The direction of excavation is determined by the center phase of the outward-facing bit, and by changing that phase, the excavation direction can be changed to either the front 1 & (up and down) or left or right direction.

(Example) Examples will be described below with reference to the drawings.

An example of the bit arrangement of the ring bit of the present invention is shown in FIG. 1-2. The number of bits (2) of the ring bit (1) shown in Figure 1.2 is 16, and only the bit string (A) (4 bits) on one edge of the ring bit divided into four is attached outward. . The four bits of the ring hit (1) shown in FIG. 1 and the bit row (B) on the opposite side facing outward are installed facing inward, and the other bits are installed in the normal straight position. The ring bit (1) in FIG. 2 is an example in which all of the bits other than the four outward facing bits are normal and straight bits.

Figure 3 shows the process of excavating rock (3) using this ring pit (1). FIG. 3(a) is a diagram showing a state in which the ring bit (1) is excavated in a straight line by giving a normal normal rotation of 3600 rotations or more. Bit (2) of the outward bit string (A) is 360
0 Drill holes uniformly and in a perfect circle coaxial with the center of rotation of the ring bit. In this state, the ring bit (1) moves straight. FIG. 3(b) shows a state in which the outward bit string (A) is arranged in the correction direction. Next, in Figure 3 (C), this (
It is a figure which shows the state which is performing the swing rotation movement at the angle of ±45 degrees centering on the phase of the position of b). At this time, the excavation direction is inclined in the direction of the outward bit row (A).

When the direction is sufficiently corrected, the state shown in FIG. 3(d) is returned to normal rotation of 3600 degrees or more.

(Effects of the Invention) As described above, according to the present invention, a ring bit with the corner facing outward is used to attach the bit on one periphery of the tip bit of the ring bit, and moreover, the oscillating rotation movement is performed with the required phase. By providing this, the excavation direction can be quickly and easily corrected during excavation, greatly increasing workability.Furthermore, the ring bit used for this requires only a slight modification, so it has the advantage of being able to be constructed at low cost.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the ring bit of the present invention;
Figure 2 is a front view showing another embodiment of the ring bit, Figure 3 is a front view showing another embodiment of the ring bit.
The figure is a process diagram showing an embodiment of the excavation method using the ring bit of the present invention, which allows easy correction of the excavation direction. (ri: ring bit (2) two bits (3)
: Bedrock (A): Outward bit string (B): Inward bit string

Claims (1)

[Claims] 1) In an excavation method in which hard ground is excavated by rotating a ring bit with a plurality of bits attached to the circumference of the tip of a pipe while applying impact or pressing force, the bit at the tip as a ring bit Using a ring bit with a structure in which only one peripheral bit row of the group is installed tilted outward, the ring bit is rotated by at least 360° to the same excavated hard ground to excavate the hard ground in a straight line, When changing the digging direction, the outward bit row of the ring bit is positioned in the correct digging direction, and then the ring bit is given a swing rotation movement in a narrow angle range around this phase to change the digging direction. A drilling method that uses a ring bit to easily adjust the drilling direction. 2) A ring bit characterized in that among a group of bits to be attached to the periphery of the tip of a tube, only one bit row at one edge is attached with an outward inclination. 3) The ring bit according to claim 2, wherein the bits in the bit row on the periphery opposite to the bit row mounted so as to be tilted outward are mounted so as to be tilted toward the inside of the ring bit. 4) The ring bit according to claim 2, wherein the bits other than the bit rows which are mounted tilted outward are mounted straight.