JPH0749751B2 - Drilling head for boring - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION I) Technical Field Currently, in excavator rotation in underground boring, mountain stoppers, boring boring of anchor bolt holes, boring of piping holes for upper, sewer, electricity, gas, etc. The drilling head of the propulsion spindle is attached, and the steel pipes or rods are connected one after another as the drilling progresses (the drilling head is attached to the leading steel pipe or rod) for long-distance boring. The present invention relates to a structure of an excavating head used for the above boring.

II) ... Problems of the prior art (1) ... Conventionally, in the boring operation as described above, when the steel pipes or rods are connected one after another while the excavation is in progress, the bit of the tip drilling head is worn. When the efficiency of cutting is reduced or it becomes impossible to perform cutting, at the position of the excavator, pull back the steel pipes or rods one by one, pull them back and replace the excavating head at the tip with a new one, and then Alternatively, the rods were connected one by one and inserted to the original cutting position, and the cutting was finally resumed.

(2) Therefore, the longer the cutting distance is, the more labor and time are required for exchanging the excavating head, which is the greatest bottleneck in improving work efficiency and shortening work time.

Also, since the wear endurance time of the bit changes depending on the soil and rock quality, proper management of the excavating head, such as grasping the wear state of the bit and deciding when to replace the excavating head, is always a heavy burden on the operator. It was what was.

III) ... Means for Solving the Problems The present invention has succeeded in effectively solving the above-mentioned conventional problems.

(1) That is, the present invention is a steel pipe type excavating head which is set on the rotary propulsion main shaft of an excavator and performs boring. Drilled,
Following the first step, second to nth windows are bored at equal intervals in the axial direction, bits are fixed to the tip of the tubular body at equal intervals, and
The problem is solved by a drilling head for boring, in which a bit is fixedly installed in each of the windows from the stage to the n-th stage.

IV) Embodiment (1) The following will describe an embodiment of the present invention with reference to the drawings. It is a steel pipe type drilling head A for boring by setting it on a rotary propulsion spindle of an excavator (not shown). On the circumferential surface of the body 1, first-stage windows 2 are provided at equal intervals in the circumferential direction, and second-stage to n-th windows 2 are provided at equal intervals in the axial direction following the first step. Then, the bits 3 are fixed to the tip end surface of the tubular body 1 at equal intervals, and the bits 3 are fixed to the bottom portion 4 in each of the windows 2 of the first to n-th steps to form the boring head A for boring. It is provided.

(2) Thus, the excavating head A is arranged so that the bit 3 fixed in the window 2 of the next stage is exposed in order before the bit 3 fixed in the window 2 of the previous stage is worn away by the excavation. The tube 1
The window 2 is arranged on the peripheral surface, and the bit 3 is fixed in the window.

(3) The bit 3 is fixed to the bottom portion 4 of each window 2 by, for example, rotting or welding.

V) ... Actions and effects (1) ... When the excavating head of the present invention having the above-mentioned configuration is attached to an excavator and boring is performed, when the bit of the first stage is worn, the bit of the second stage appears and the second stage is excavated. When the bit of No. 3 wears out, the bit of the 3rd stage appears, and new bits of the next stage appear up to the nth stage one after another to excavate, so there is no need to replace the excavation head even for long distance drilling or hard ground drilling. You can continue to work, and you can be extremely effective.

(2) Therefore, it is unnecessary to replace and manage the excavating head as in the conventional case, and the conventional problem can be effectively solved.

(3) As described above, according to the excavating head of the present invention, the longer the distance is excavated and the harder the ground is excavated, the more the characteristics can be exhibited, which is much more advantageous than the conventional one, and the work can be performed easily. It is possible to realize a great reduction in personnel and work costs.

[Brief description of drawings]

FIG. 1 is a front view of the excavating head of the present invention, FIG. 2 is a partial side view, and FIG. 3 is a development explanatory view. Appendix A ... Drilling head, 1 ... Tube, 2 ... Window, 3 ... Bit, 4 ... Bottom part.

Claims (2)

[Claims] 1. A steel pipe type excavating head for boring when set on a rotary propulsion spindle of an excavator, wherein first-stage windows are bored at equal intervals in a circumferential direction on a peripheral surface of a tubular body,
Following the first step, second to nth step windows are bored at equal intervals in the axial direction, and bits are fixed at equal intervals at the tip of the tubular body.
A boring head for boring, wherein a bit is fixedly installed in each of the windows from the step to the n-th step. 2. A window is provided on the peripheral surface of the tubular body so that the bit fixed in the window of the previous stage is not worn away by excavation and the bit fixed in the window of the next stage is exposed in order. The boring drilling head according to claim 1, wherein a bit is fixed in the window.