KR200371825Y1 - Separation type drilling a hole in ground bit - Google Patents

Abstract

The present invention is a drilling bit mounted on the rod end of the drilling device to drill the ground or rock, the pilot bit for drilling the ground or rock by the rotation of the rod; An outcasing bit detachably coupled to the pilot bit; The casing shoe for inserting the casing into the drilling hole at the same time as the drilling operation; can be configured to drill holes of various caliber, and at the same time provides a separate drilling bit to reduce the construction cost.

Description

Separation type drilling a hole in ground bit}

The present invention relates to a drilling bit for drilling a ground or rock, specifically, it is composed of a removable structure capable of drilling a plurality of diameters, and at the same time as the drilling work can be inserted by inserting the casing into the hole The present invention relates to a separate drill bit that can shorten the casing embedding process.

In general, various civil engineering works embed a plurality of casings to prevent leakage or stabilize the soil, and in order to bury the casing, a hole is formed in the ground or rock.

Fig. 1A shows a conventional fabric mill used for such work.

Referring to the drawings, the drilling apparatus 1 includes a trolley 20 having a rail 10 formed on an upper surface thereof, a rotary head portion 30 guided and moved on the rail 10, and the rotary head portion 30. Hammer device 40 is coupled to the rotating shaft 31 protruding to the front of the) and the drill bit 50 is provided at one end of the hammer device.

Looking at the drilling operation of the drilling device configured as described above, the rotary shaft 31 of the rotary head portion 30 is rotated by the hydraulic or pneumatic pressure introduced from the outside, accordingly the hammer device coupled to the rotary shaft 31 40 and the drilling bit 50 are also rotated together. At this time, the hammer device 40 imparts impact energy to the ground or rock by reciprocating the drilling bit 50 in the axial direction. Therefore, the drilling mill performs drilling and hammering at the same time, and moves the rotary head portion 30 in the axial direction according to the drilling depth to drill the ground or rock.

Here, as shown in FIG. 1B, the drilling bit 50 includes a head portion 53 in which a plurality of striking pins 51 are formed, and a body portion 55 coupled to the hammer device 40. Is formed.

However, the conventional drilling bit 50 requires a plurality of drilling bits having various diameters in order to drill holes having various diameters required for civil construction because the head portion 53 and the body portion 55 are integrally formed. As a result, these punch bits were expensive and were a big burden on the construction cost.

In the conventional drilling operation, the hole is drilled using the mill factory, and the casing is embedded in the hole using separate equipment, and then a post-process of civil engineering is executed.

Accordingly, an object of the present invention for solving the above-mentioned problems is that a part of the drilling bit is formed to be detachable to drill holes of various diameters, and at the same time provide a separate drilling bit that can reduce construction costs. Is in.

In addition, since the casing can be buried in the ground at the same time as the drilling work, the work process can be greatly shortened, and as the work process is shortened, there is another object of providing a separate punch bit device that can improve productivity.

1A is a schematic diagram showing a fabric mill according to the prior art;

FIG. 1B is a schematic diagram showing the puncturing bit of FIG. 1A

Figure 2 is a perspective view of the main part of the removable drill bit according to the present invention.

3A is an exploded perspective view of the removable drill bit of FIG. 2.

3B is a sectional view taken along line A-A.

3C is a sectional view taken along line B-B.

Figure 4a to 4c is a view for explaining the drilling operation process using a separate drilling bit of the present invention.

* Description of the symbols for the main parts of the drawings *

Pilot bit: 100 Load: 101

Body part: 110 Cutting tip: 111

Nozzle: 113 Fixing Pin: 115

Retaining Groove: 117 Spring: 119

Extension: 120 Outlet: 130

Out casing bit: 200 cutting tip: 201

Ring Groove: 205 Outer Peripheral Groove: 207

Casing Shoe: 300 Casing: 301

The present invention for achieving the object as described above is a drilling bit mounted on the rod end of the drilling device to drill the ground or rock, the pilot bit for drilling the ground or rock by the rotation of the rod; An outcasing bit detachably coupled to the pilot bit; And a casing shoe for inserting the casing into the drilling hole at the same time as the drilling operation.

Hereinafter, with reference to the accompanying drawings an embodiment according to the present invention will be described in detail.

Figure 2 is a perspective view of the main portion of the removable drill bit according to the present invention, Figure 3a is an exploded perspective view of the removable drill bit of Figure 2, Figures 3b and 3c is a cross-sectional view taken along the lines A-A and B-B.

As shown in the figure, the present invention is a separate drill bit is a pilot bit 100, the pilot bit 100, the out casing bit 200 is detachably coupled, and the casing in the drilling hole at the same time as the drilling operation ( It consists of a casing shoe 300 for inserting 301.

The pilot bit 100 is a body 110 having a cutting tip 111 for drilling a ground or rock and a nozzle 113 for ejecting a hardener to prevent the drilling hole from collapsing during a drilling operation. And an extension part 120 in which a male screw 121 is formed to be engageable with the rod 101 protruding in the direction of the tip end from the rotary head part. At this time, the body portion 110 and the extension portion 120 is formed integrally, the extension portion 120 is formed to protrude in the axial direction from the rear of the body portion (110).

In addition, the pilot bit 100 is provided with a fixing pin 115 to be detachable in the outcasing bit 200, the fixing pin 115 is a predetermined formed on the outer peripheral surface of the body portion 110 A part is coupled to be inserted into the fixing groove 117 of depth, and a spring 119 is provided between the bottom surface of the fixing pin 115 and the bottom surface of the fixing groove 117. Here, the role of the spring 119 is to ensure that a part of the fixing pin 115 always protrudes to the outside of the body portion 110, and is inserted into the body portion 110 when the external force is received. This is to maintain the protruding state once the external force is removed.

On the other hand, the outer peripheral surface of the pilot bit 100 is provided with a plurality of concave discharge portion 130 for discharging the cutting material generated during the drilling operation to the outside.

The outcasing bit 200 has a hollow cylindrical shape to surround the pilot bit 100, and is open to protrude a front surface of the pilot bit in the front center portion of the front end portion, and a cutting tip 201 for drilling the ground or rock. ) Is coupled, and at the rear end, a male screw 203 is formed to be coupled to the casing shoe 300. At this time, a ring groove 205 having a hemispherical cross section is formed along the inner circumferential surface of the outcasing bit 200, and the protrusion of the fixing pin 115 is coupled when the pilot bit 100 and the outcasing bit 200 are combined. The part is inserted into the ring groove 205 and fixed. In addition, the ring groove 205 is formed in a concave hemispherical shape so that the fixing pin 115 can be separated from the ring groove 205 when a force is applied to the pilot bit 100 in the axial direction. Meanwhile, an outer circumferential groove 207 having a diameter and a predetermined axial length of the male screw 203 is formed between the front end portion and the rear end portion, which will be described later.

The casing shoe 300 has a female thread 303 corresponding to the male screw 203 of the out casing 200 formed on the inner circumferential surface of the front end portion by an axial length shorter than the axial length of the male screw 203, and the casing 301. Step portion 305 is formed so that a portion of the insertion is coupled. The casing shoe 300 formed as described above is provided with a casing 301 for preventing leakage and soil stability of the ground or rock, and when rotated together with the outcasing bit 200, the power consumption increases. In order to prevent this, the casing is rotatably coupled to the outcasing 200.

Here, looking at the coupling state of the casing shoe 300 and the out casing bit 200, the casing shoe 300 is coupled in the axial direction from the rear of the out casing bit 200, the female screw of the casing shoe 300 303 is positioned in the outer circumferential groove 207 via the male screw 203 of the outcasing bit 200. At this time, as described above, the outer peripheral groove 207 has a smaller inner diameter and longer axial length than the female screw 303, so that a predetermined gap 307 is formed between the outcasing bit 200 and the casing shoe 300. Is formed so that the rotation of the outcasing bit 200 does not affect the casing shoe 300. In addition, the fastening direction of the male screw 203 and the female screw 303 is formed in a direction opposite to the rotation direction of the outcasing bit 200 so that the outcasing bit 200 and the casing shoe 300 are not separated during the drilling operation. Do not.

On the other hand, the pilot bit 100 and the out casing bit 200 is provided with a transmission means for transmitting the rotational force transmitted from the rod 101 to the outcasing 200 without loss, the transmission means is a pilot bit A plurality of locking jaws 131 formed along the outer circumferential surface of the body portion 110 of the body 100, and a plurality of locking grooves 133 formed on the inner circumferential surface of the outcasing bit 200 in a shape into which the locking jaws 131 can be inserted. It is composed of At this time, as shown in the figure, the engaging jaw 131 and the engaging groove 133 are provided in six pieces, respectively, and the engaging jaw 131 is not formed with the discharge part 100 of the pilot bit 100. It is formed on the outer circumferential surface at equal intervals, and the locking groove 133 is formed on the inner circumferential surface of the outcasing bit 200 corresponding to the locking step 131.

Figures 4a to 4c is a view illustrating a drilling operation process using a separate drilling bit of the present invention.

As shown in FIG. 4A, an outcasing bit 200 is coupled to a front surface of a casing shoe 300 having a casing 301 at a rear end thereof, and a pilot bit 100 coupled to an end of the rod 101. Is penetrated through the inside of the casing shoe 300 and coupled to the outcasing bit 200. In this case, the locking jaw 131 of each of the pilot bits 100 should be positioned so as to correspond to each other with the locking groove 133 of the outcasing bit 200, so that if the position does not coincide with the pilot bit 100. You can find the exact position and combine by applying force in the insertion direction by rotating. The pilot bit 100 inserted as described above is coupled to the ring groove 205 of the outcasing bit 200 by the fixing pin 115, and the cutting tip 111 and the nozzle 113 are out when the coupling is completed. The casing bit 200 is exposed to the front.

When the preparation is completed through the above process, as shown in FIG. At this time, the casing 301 is coupled to rotate independently of the outcasing bit 200 as described above does not rotate during the drilling operation.

Figure 4c shows the last step of the drilling operation, after the drilling operation is completed, when the retracted by applying a force in the axial direction to the pilot bit 100, the fixing pin 115 is retracted inserted into the body portion 110 It is separated from the ring groove 205. When the pilot pin 100 is separated from the out casing bit 200 by continuously retracting the rod 101 while the fixing pin 115 is separated from the ring groove 205, the out casing bit 200 and the casing are finally removed. Only 301 remains in the drill hole.

Here, the casing is buried in the ground to prevent the leakage of soil or rock and soil stability in the prior art buried the casing through a separate operation after the drilling work, but the present invention is the same method as the drilling work is inserted into the casing This reduces the number of work steps and reduces costs.

As described above, the configuration of the separable drill bit according to a preferred embodiment of the present invention is shown in accordance with the above description and drawings, but this is merely described, for example, and various changes without departing from the technical spirit of the present invention. And those skilled in the art will appreciate that changes are possible.

The present invention is a removable drill bit is formed so that the pilot bit and the out casing bit can be detachable can drill holes of various diameters, and at the same time has the effect of reducing the construction cost.

In addition, since the casing can be buried in the ground at the same time as the drilling work, the work process can be greatly shortened, and as the work process is shortened, productivity is also improved.

Claims (7)

In the drilling bit mounted to the rod end of the drilling device, A pilot bit coupled to a rear end of the rod to perform a drilling operation by rotation of the rod; An outcasing bit coupled to the pilot bit in a detachable manner and configured such that a portion for drilling of the pilot bit protrudes from the tip; A casing shoe coupled to a rear end of the outcasing bit and accommodating the rod and pilot bits therein; Detachable punch bit, characterized in that configured to include. The method of claim 1, The pilot bit, A body portion having a cutting tip and a nozzle formed on a front surface thereof, an extension portion protruding to a rear surface of the body portion, and a fixing pin movably coupled to the body portion and movable outwardly; The out casing bit, Separating drilling bit, characterized in that the engaging groove is inserted into the inner peripheral surface is inserted into the projecting portion of the fixing pin. The method of claim 2, The fixing pin, Separating drill bit, which is inserted into the fixing groove of a predetermined depth formed on the outer surface of the body portion, a spring for elastically supporting the fixing pin is provided inside the fixing groove. The method of claim 1, The out casing bit, Detachable punch bit, characterized in that the cutting tip is provided on the front end portion. The method of claim 1, A separation drill bit is formed along an outer surface of the body of the pilot bit, and a locking groove is formed on an inner surface of the outcasing bit so that the locking step can be inserted therein. The method according to any one of claims 1 to 5, And the casing shoe is coupled to the outer casing bit so as to be rotatable with each other. The method of claim 6, The out casing bit, A male screw is formed at the rear end, and a ring groove having a smaller diameter than the male screw is formed at the tip of the male screw. The casing shoe, And a female thread corresponding to the male screw in a front end portion, wherein the female screw has an axial length shorter than an axial length of a ring groove.