KR20140062591A - Drill bit for underground excavation and slime discharging method using that - Google Patents

Abstract

A reaming drill bit for underground excavation according to the present invention includes: a housing which has multiple drill tips on a bottom surface; and a shank which can be axially rotated by being coupled to a drill rod or a hammer and is inserted into an upper side groove portion of the housing to be connected to the housing. An expandable wing cutter, which is allowed to protrude or retract through an outer wall portion by the axial torque of the shank, is accommodated in a parking path which is formed in the housing, and the shank and the expandable wing cutter are configured with one to three engaged protruding portions and groove portions so that the axial torque can be transmitted in the linear transport direction of the expandable wing cutter and direct boring and expanded boring can be available at the same time. According to the present invention, the single drill bit allows not only the direct boring but also boring diameter expansion into various diameters, and thus the utility of the drill increases, additional drills do not have to be brought into construction sites, and no time is taken for drill exchange to result in cost- and period-saving effects.

Description

Technical Field [0001] The present invention relates to a drill bit for a ground excavation and a method of using the drill bit,

The present invention relates to a drill bit for a ground excavation, and more particularly, to a drill bit for a ground drilling operation for a foundation construction or a slope stabilization construction of a construction structure, a horizontal drilling for an unfitting method, a support for an offshore structure, The present invention relates to a drill bit for ground excavation and a method of using the drill bit.

Generally, in the field of construction, for the construction of compression piles or buoyancy anchors used for the foundation of structures, and for the construction of tensile members such as piles to resist anchor or drawing used in slope stabilization and other ground related structures, To the same diameter. In this case, when a pneumatic holding casing is installed so that the pneumatic wall does not fall during the drilling operation or in the vicinity of the piercing hole, it is possible to use a drill capable of small pore size and to have a diameter equal to or slightly larger than the outside diameter of the pore- And the pores for retaining the pores are inserted together. In this case, however, the pores are punched to the same diameter.

However, if the same diameter is drilled in this manner, the drilling operation is simple and easy, but it is disadvantageous to drill deeply to reach a solid ground such as weathered rock or soft rock which can support most structural members.

Particularly, in the case of a compression member such as a pile (a plain pile, a single-pile pile integrated with a column), even if the pierced hole is drilled to a solid ground, the area of the piercing tip is small. Yielding (exceeding the allowable bearing capacity). In the case of a tensile member such as an anchor or a tensile pile, a tensile member is inserted in an already-opened hole. Therefore, when a common load is applied to the tensile member, a pulling resistance sufficient to resist the pulling is too small. After piercing and inserting to the bedrock layer, injecting material such as cement grout into double or triple hole and curing it increases frictional resistance and adhesion resistance to ensure pull resistance.

Since the piercing length is long and the structure of the tensile member and the order of construction are complicated, the amount of the injection material is excessive, the construction cost is increased, and the natural environment damage is increased in the inside of the small hole of the perforation hole, There is a problem that environmental pollution components included in the groundwater are contaminated by surrounding water.

In this case, enlarging the tip of the pile or tensile member greatly improves the bearing capacity of the pile or tensile member, thereby solving these problems while securing economical efficiency. For this purpose, A drill bit capable of simultaneously enlarging the diameter of the distal end portion is desired.

As an example of a device for expanding the diameter drilled in the ground up to now, Korean Patent No. 990201 discloses a " variable piercing hammers for pile tip extension ", and Korean Patent No. 685386 discloses a " A borehole drilling apparatus having an enlarged wing and a drive method thereof ".

"Variable drilling hinge for pile tip extension" disclosed in Korean Patent No. 990201 is a drill used only for a large-scale expansion drilling which supports the tip of a pile. In order to perform vertical drilling, a vertical drilling is required with a separate drill. And the equipment is complicated because hydraulic pressure and pneumatic pressure are used at the same time. Therefore, there is a problem that the hydraulic line is installed in the entire section of the drill, and it is difficult to recover the equipment from the underground when the hydraulic line is broken.

Also, the "borehole drilling apparatus having an in-line extension wing and the driving method thereof" disclosed in the domestic registered patent No. 685386 can be used only for the purpose of small-scale expansion drilling, and it is possible to use a drilling hole and a drilling hole, There is a problem that a separate drill must be additionally used.

Accordingly, it is an object of the present invention to provide a drilling apparatus and a drilling method for drilling a drill bit from a ground at any time, And a method of using the drill bit.

Another object of the present invention is to provide a drilling drill for a ground excavation which can easily install a drill bit without changing a specific structure such as a drill rod or a hammer, Bit < / RTI >

According to the present invention, there is provided a drill bit for ground excavation, comprising: a housing having a plurality of drill tips at a bottom bottom; a shaft coupled to the drill rod or hammer to be rotatable about an axis and inserted into an upper groove of the housing, And an expansion wing cutter capable of protruding and retracting through an outer wall portion by an axial rotation force of the shank is accommodated in a parking passage formed in the housing, wherein the shank and the expansion winker have one to three engaging projections and a groove structure And the shaft rotating force is transmitted in the linear transport direction of the extended wing cutter.

The present invention also provides a drill bit for ground excavation, comprising: a housing having a plurality of drill tips at a bottom bottom; a shank coupled to the drill or hammer to be rotatable about an axis and connected to the housing by being inserted into an upper groove of the housing; And an expansion wing cutter capable of protruding and retracting through an outer wall portion by an axial rotational force of the shank is accommodated in a parking passage in a parking passage tubular body provided in an outer wall cutout portion of the housing, wherein the shank and the expansion winker include a plurality of engaging projections And the shaft rotating force is transmitted in the linear transport direction of the extended wing cutter by the groove structure so that both the straight and extended punches can be used.

The present invention relates to a drill bit for ground excavation, comprising: a housing; a shank coupled to the drill rod or hammer and axially rotatable, the shank being inserted into an upper groove of the housing and connected to the housing; A shank having a plurality of drill tips on its bottom surface and adapted to be received in a parking passage formed in the housing, the shank extending and retractable through an outer wall portion by an axial torque of the shank, And the shaft rotating force is transmitted in the linear transport direction of the expanding wing cutter by the three engagement projections and the groove structure so that both the straight and extended punches can be used.

The present invention relates to a drill bit for ground excavation, comprising: a housing; a shank coupled to the drill rod or hammer and axially rotatable, the shank being inserted into an upper groove of the housing and connected to the housing; And an enlarged wing cutter which is capable of protruding and retracting through the outer wall portion by the shaft rotational force of the shank is accommodated in a parking passage in a parking passage tube body provided in an outer wall cutout portion of the housing, The shank and the expanding winker are configured such that the shaft rotational force is transmitted in the linear transport direction of the expanding wing cutter by at least one engaging protruding portion and a groove structure so that both the straight perforation and the extended perforation can be used.

The present invention relates to a drill bit for ground excavation, comprising: a housing; a shank coupled to the drill rod or hammer and axially rotatable, the shank being inserted into an upper groove of the housing and connected to the housing; And an extension adjusting key for limiting the degree of extension of the extended wing cutter is provided on the housing, the extension wing cutter being capable of being projected through the outer wall of the housing by the shaft rotation force of the shank, And is constructed to be built in the housing, so that it is possible to combine straight holes and expansion holes.

In constructing the above-described drilling bit for ground drilling, an enlarged woven cutter is arranged so that it can be drilled straight by one-directional shaft rotation of the shank and can be extended by the enlarged wing cutter by rotating in the same direction Can,

As another aspect of the above-described drilling bit for ground excavation, it is possible to immerse the straight hole and the enlarged wing cutter by rotating the shank in one direction, and to expand the drilling by the extended wing cutter by rotating the shank in the reverse direction An enlarged wing cutter may be disposed to form the enlarged wing cutter.

Further, in constructing the drill bit for ground excavation according to the present invention, the shank and the housing are slidable so that the shank can slide up and down. The bottom of the shank and the bottom of the groove of the housing are fitted with a key- So that the shank and the housing are directly slid while moving integrally while the shank and the housing are engaged with each other while the rotary shaft is engaged with the keyhole and the keyhole so that the shank and the housing are engaged with each other, As the fit of the keyway is released, the axial rotation of the shank expands the wing cutter in a linear manner to expand it.

Further, in the method of using the drill bit for ground excavation according to the present invention, the drill bit having the expanded wing cutter and the shank and the housing slidably fitted in the upper and the lower limit sliding is pushed to at least one of the upper drill rod, drill hammer and ground equipment The lower end of the shank and the groove bottom surface of the housing are fitted into the keyhole portion in which the shear force is applied and the keyhole structure, the shank rotates integrally with the housing mounted with the drill tip at the bottom, The shank of the shank rotates in the same direction as the straight hole in the state where the keyhole portion of the shank is removed from the key groove portion by pressing or pressing the drill bit as opposed to the direct disclosure, so that the shaft rotation force of the shank linearly feeds the expanded wing cutter.

As a further aspect of the method of using the drill bit for ground excavation according to the present invention, a drill bit having an enlarged wing cutter and fitted with a shank and a housing slidably in an upper and a lower limit sliding manner is inserted into at least one of the upper drill rod, drill hammer, When the lower end of the shank and the groove bottom surface of the housing are fitted to each other by a key or a key-groove structure in which a shearing force acts, the shank rotates integrally with a housing equipped with a drill tip on the bottom, The shaft torque of the shank is linearly transferred as the shank is rotated in the direction opposite to the straight hole in the state where the keyhole portion of the shank is missing from the key groove by pressing or pressing the drill bit as opposed to the direct disclosure, It is characterized by.

The present invention enables a drill bit to be expanded in various diameters as well as a direct drill hole in a single drill bit. Therefore, the utilization of the drill is high and the additional drill is not required to be carried in the construction site. And air is saved.

In addition, when the shaft rotation force is converted to the linear feed force to the extended wing cutter, the rotation direction of the rotary wing cutter coincides with the pressing direction of the rotary wing cutter, so that the rotation force is converted into the linear feed force. The enlarged wing cutter is firmly supported in the box-shaped parking passage formed in the housing, which is a very robust structure even in the case of large-scale expansion.

In addition, it is possible to expand to various diameters from small-scale to large-scale drilling. In any case, there is no drill left in the ground, that is, it is easy to recover the drill and can be easily installed without changing special structure such as drill rod or hammer And it is very easy to construct, and it is possible to drill quickly to various standard in not only soil layer, gravel layer, but also hard rock layer over weathered rock layer or soft rock layer.

In order to reduce the burden on the drill user, the bottom body with the drill tip can be implemented as a replacement type because the drill tip and the bottom of the bottom body are very abrasive, so that it is possible to manufacture the part with ease, Inshank and housing can be used for a long time, and the burden of drill bit replacement is greatly reduced for the customer.

1 is a perspective view of a drill bit for ground excavation according to an embodiment of the present invention;
Fig. 3 is an exploded perspective view of the drill bit for ground excavation shown in Fig. 1,
4 is a perspective view of a drill bit for ground excavation according to the present invention, in which a housing is removed using a virtual line,
Fig. 5 is a sectional view showing a state where the extended wing cutter of Fig. 1 is in the parking passage of the housing;
6 is an exploded perspective view of a modification of the drill bit for ground excavation of the present invention.
FIG. 7 is a perspective view showing the assembled drill bit for ground excavation shown in FIG. 6,
8 is a perspective view of a drill bit for ground excavation according to the present invention,
9 is a ground excavation state in the case where the drill bit for ground excavation of the present invention is applied to a screw drill rod,
FIG. 10 is a sectional view showing the state of the extended wing cutter in the case of the straight hole, the small hole or the large scale spread according to FIG. 9,
FIG. 11 is a ground excavation state when the drilling bit for ground excavation of the present invention is applied to a tubular drill rod,
FIG. 12 is a sectional view showing the state of the extended wing cutter in a straight hole, a small hole or a large scale spread according to FIG. 11,
FIG. 13 is a perspective view of a drill bit for ground excavation according to another embodiment of the present invention, FIG.
Fig. 14 is a front view of Fig. 13,
Figs. 15A and 15B are views for explaining the axis connection state of the extended wing cutter as the AA-line cut plane in Fig. 14,
FIG. 16 is a perspective view and a front view of a rotary cutting type (auger type) drill bit according to another embodiment of the present invention, FIG.
Figs. 17 and 18 are views showing the construction of a recessed portion of a drill bit for ground excavation for explaining a structure in which a transition between a straight hole and an enlarged hole can be immediately made;
FIG. 19 is a state sectional view of a drill bit for enlarged perforation conversion in a straight hole,
20 is an operating state of an elastic body provided at a rear portion of a parking passage for enlarged perforation switching in a straight hole;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The drilling bit for ground excavation according to the present invention is mounted on the tip of a drill rod or a drill hammer to form a perforation hole. Using a single drill bit, the drill bit can be used for small- It also enables large-scale deployments.

The drill bit for ground excavation according to the present invention has a structure that can be easily recovered to the ground after completion of drilling even though the drill hole can be enlarged. The slit during drilling or the residual It is also implemented so that slime processing can be done.

In driving the drilling bit for ground excavation according to the present invention, the main driving force used in the straight drilling, the expansion drilling and the drill recovery process is a pressing force due to a shaft rotational force and a pneumatic stroke transmitted to the drill bit through the drill rod. The drilling bit for ground excavation also includes features that can be installed and used in existing excavation equipment without the need for retrofitting existing equipment or making new additional equipment.

The drill bit of the present invention is applicable to both striking type and rotary cutting type (auger type), and the drill bit 100 of the present invention shown in Figs. 1 to 7 is an example of a striking type drill bit.

The drilling bit 100 for ground excavation according to the present invention is provided with an enlarged wing cutter 8 which can be externally expanded in the housing 4 for the purpose of both direct drilling and expansion drilling. .

FIG. 1 is a perspective view of a drill bit 100 for striking ground excavation according to an embodiment of the present invention. FIG. 3 is an exploded perspective view of the drill bit 100 for ground excavation shown in FIG. 1. FIG. to be.

FIG. 1 is a perspective view showing a state in which the extended wing cutter 8 is immersed in the housing 4, and FIG. 2 is a perspective view showing the wing cutter 8 in a state in which the extended wing cutter 8 protrudes from the housing 4 Respectively.

1 to 3, the drilling bit 100 for ground excavation according to the present invention is connected to a drill hammer coupled to the tip of a drill rod or to the end of a drill rod, Spline shaft coupling and so on.

The drilling bit 100 for ground excavation according to the present invention comprises a shank 2, a housing 4 and a replaceable drill bit 9 having a drill tip 9 on the underside, as in the embodiment shown in Figs. A bottom body 6, and an enlarged wing cutter 8.

In Figs. 1 to 7, the columnar housing 4 and the bottom piece 6 have the same outer diameter and are separated from each other. So that the drill bit (9) on the bottom of the drill bit can be replaced when worn. A plurality of drill tips 9 necessary for the straight holes are mounted on the bottom surface of the bottom body 6 and the bottom body 6 integrated with the housing 4 receives rotation of the shaft 2 and rotates.

The housing 4 and the bottom piece 6 can be fastened together with a pin-piece fastening structure which resists shear force together with a cross-sectional track-type socket-fitting structure, as shown in Fig. That is, a structure in which the track-shaped socket portion 6a of the bottom piece 6 is integrally fixed in the housing 4 and is firmly coupled to the fastening member 14 such as a fixing pin or a bolt to be.

1 to 7, the drilling bit 100 for ground excavation has been described as a structure in which the housing 4 and the bottom body 6 are separated from each other. However, as in the other example shown in FIG. 8, It should be understood that the drilling bit 100A for ground excavation can be implemented with the housing 4 of the member.

The shank 2 inserted into the housing 4 through the upper groove of the housing 4 is housed in the housing 4 together with the housing 4 so that the expansion wing cutter 8, The axis of rotation is connected. 3, the flange portion of the shank 2 inserted into the upper groove of the housing 4 has a hook pin 12 fastened to the upper end of the housing 4 by the flange portion of the shank 2 11 so that the shank 2 is rotatable but does not fall outside.

The housing 4 is formed with one to three parking passages 17 for linearly moving the extended wing cutter 8 and each extended wing cutter 8 stays in the corresponding parking passage 17. [ As shown in FIGS. 1 to 4, the extended wing cutters 8 are preferably installed on both sides of the lower rotary shaft of the shank 2 so as to be axially connected to each other. For the stability of rotation during expansion drilling, It is also possible to provide three expansion wing cutters 8 in the housing 4.

In addition, a conventional multi-bit system refers to an assembly by installing a plurality of bits in one large-sized tube for large-diameter drilling. In the present invention, a single bit in a multi-bit system, that is, An enlarged wing cutter 8 may be provided. If necessary, three expansion wing cutters 8 per single bit can also be provided.

The lower end of the shank 2 inserted into the housing 4 is engaged with the trailing end of the enlarged wing cutter 8 and one of the engaging projections 16a And an engagement groove 16b so as to transmit the shaft rotational force of the shank 2 to the expansion wing cutter 8 in the parking passage 17 in the housing 4 so that the expansion wing cutter 8 is rotated in the T horizontal Direction linearly.

As shown in FIG. 3, the extended wing cutter 8 has the engagement protrusion 16a at the rear end thereof and the engagement groove 16b at the rear end of the shank 2 to engage with each other. The enlarged wing cutter 8 in the parking passage 17 formed in the housing 4 by the axial rotation of the shank 2 is extended to the outside of the cylinder of the housing 4 or the expanded wing cutter 8 Is introduced into the parking passage 17.

It is an embodiment that the parking passage 17 in which the extended wing cutter 8 stays is formed in the housing 4 itself as shown in Figs. 1 to 5.

13 to 17, when the circumferential diameter of the housing 4 needs to be reduced or the extension length of the extended wing cutter 8 needs to be increased, It is also possible to provide the parking passage tube body 24 having the parking passage 17 in the outer wall cutout portion of the parking passage tube body 24 and the expanded wing cutter 8 in the parking passage tube body 24.

The drilling bit 100B for ground excavation having the parking passage tube body 24 is formed in the shape of the shank 2 as shown in Figs. 15A and 15B, The shaft torque can be transmitted to the expanding wing cutter 8 in a rack-pinion gear configuration. In other words, the lower rotary shaft of the shank 2 is formed with a plurality of engaging grooves 16b in the form of a pinion gear, and the enlarged wing cutter 8 in the parking passage tube body 24 is formed by lapping a plurality of engaging projections 16a So that the power transmission between them is performed. In Fig. 15, reference numeral "30" formed in the parking passage tube body 24 is a stopper function stopper function for preventing the extended wing cutter 8 from falling off.

The maximum extension length of the extended wing cutter 8 is limited when the parking passage 17 of the extended wing cutter 8 is placed in the housing 4 but a separate parking passage body 24 is provided in the housing 4, The length of the extended wing cutter 8 can be increased in proportion to the length of the parking passage tube body 24. [ The length of the extended wing cutter 8 having the parking passage tube body 24 is preferably 1.2 to 3.0 times the diameter of the housing 4. [

3, a rotation restricting space portion 18 of the shank 2 is provided at an intermediate flange portion of the shank 2 and a rotation restricting space portion 18 is formed at an inner side surface of the groove portion of the housing 4 corresponding thereto. The movable stopper 20 is fixed within the operating range. Thus, when the shank 2 rotates, the shaft rotation force is transmitted to the extended wing cutter 8 so that the extended wing cutter 8 linearly operates within the operating range of the rotation restricting space portion 18, When the stopper 20 of the housing 4 reaches the one end of the rotation restricting space portion 18 of the shank 2 and stops, the shaft torque of the shank 2 is transmitted to the housing 4 ) Itself.

The drilling bit 100 for ground excavation according to the embodiment of the present invention is an example of a tool for controlling the protruding and detaching control of the extended wing cutter 8 as an extension control key 10 in the housing 4 do.

However, it is also possible to control the appearance of the extended wing cutter 8 without the extension control key 10 being provided. 17 and 18 are enlarged exploded drill bits 100B for ground excavation according to another embodiment of the present invention by using the mutual fitting structure of the shank 2 and the housing 4 without the expansion control key 10, The structure for controlling the appearance of the wing cutter 8 will be described later in detail with reference to FIGS. 17 to 20 together.

First, the control of the protruding / detaching control of the extended wing cutter 8 using the expansion control key 10 will be described in detail.

In the present invention, one of the drill bits 100 for ground excavation can be used to extend drilling to a small diameter or a large diameter as well as a straight hole, and an expansion control key 10 is used as an embodiment of the drill bit.

In order to install the expansion control key 10, in the present invention, the key receiving recess 22 is provided in the flange wall portion facing the in-groove shank 2 of the housing 4 as shown in FIG. 3, The key receiving groove 22 is provided on the inner wall of the parking passage 17 in which the enlarged wing cutter 8 is accommodated. The extended key 10 is used as the key receiving groove 22 provided as described above.

The key receiving groove 22 is a space in which the extension adjusting key 10 for limiting the protruding length of the extended wing cutter 8 is accommodated and a key retracting groove is formed along with the key receiving groove 22. The key escape groove may be formed on the upper side or the lower side of the key receiving groove 22 and the depth of the key receiving groove 22 may be further deepened.

When the extension adjustment key 10 for limiting the protruding length of the extended wing cutter 8 is removed from the key receiving groove 22 and stays in the key escape groove, the extended wing cutter 8 can be freely linearly moved, Up to the maximum extension length of the projection 8 is allowed. However, when the extension control key 10 is inserted into the key receiving groove 22, the linear feed of the extension control key 10 is restricted by the extension control key 10. That is, the enlarged wing cutter 8 is immersed in the parking passage 17, at this time, only the straight hole by the drill tip 9 of the bit bottom is possible.

The expansion control key 10 may have the same size as that of the key receiving groove 22 or a narrower width than the standard size. The expansion control key 10 may be composed of one piece or two or three pieces. .

The extension adjustment key 10 having the same width as the key receiving groove 22 is used when the extension wing cutter 8 protrudes to the maximum length and is extended. In the case of using the expansion control key 10 having a narrower left and right width, it is used at the time of small diameter widening in which the maximum protruding length of the extended wing cutter 8 needs to be shortened. Therefore, according to the size of the left and right widths of the expansion control key 10, it is possible to achieve various sizes smaller than the maximum widening size.

If the extension control key 10 is provided in the form of two or three pieces instead of one piece, the operator can change the protruding length of the extended wing cutter 8 to the size of the wing cutter 8 as much as the number of pieces . For example, by using the two-piece extension control key 10, it is possible to adjust the bubble size in two stages other than the straight holes.

The expansion wing cutter 8 which is embedded in the parking passage 10 is positioned in the circumferential direction of the housing 4 even if the shank 2 rotates in the axial direction, The drill bit 100 does not protrude to the outer wall, and the drill bit 100 is directly boring as the hammer 100 is rotated. However, if the expansion control key 10 is escaped from the key receiving recess 22 to the key escape groove or if the expansion control key 10 has a smaller width than the standard of the key receiving recess 22, Is pushed out by the shaft rotation of the shank 2 and protrudes to the outside of the housing 4.

When the extension adjusting key 10 such as the width of the key receiving groove 22 is located in the key receiving groove 22 and the full evacuation is performed with the key evacuation groove, And protrudes outside of the housing 4 in a lengthwise direction.

The extension adjusting key 10 having a smaller width than the width of the key receiving groove 22 is fixed to the key receiving groove 22 and the extended wing cutter 8 is inserted into the key receiving groove 22 The protrusion can be protruded to the outside of the housing 4 with an arm length equal to the width standard minus the width of the expansion control key 10. Even if the extension adjustment key 10 has a width smaller than the width of the key receiving groove 22, if the extension wing cutter 8 is designed to protrude to the outside of the housing 4 with its maximum arm length, It is possible to completely evacuate the control key 10 to the key evacuation groove.

When the expansion control key 10 is formed of a set having a plurality of pieces, the arm length of the extended wing cutter 8 can be protruded to the outside as much as the width of each piece of the expansion control key 10, Is fully retracted into the key retracting groove and the remaining pieces are fully accommodated in the key receiving groove 22, the enlarged wing cutter 8 can be protruded to the outside as much as the width of a single piece worn in the key retracting groove.

If the standard of the expansion control key 10 is variously prepared as described above, it is possible to apply various piercing diameters according to the site conditions of the ground penetration.

In the present invention, control is performed such that the expansion control key 10 enters and leaves the key receiving groove 22 using a position conversion tool. The location conversion tool can be implemented to be performed by manual or automatic operation.

Locating tools that allow manual operation include fixing bolts, pulling rods, push bars, and weights. For example, in the case of a fixing bolt, a structure in which a key hole or a key slot is formed in the housing 4 at a position conversion point and the fixing bolt is inserted into a key hole or a key slot and is fastened and fixed to a plate- . When the extension control key 10 is manually operated by the position changing tool using the fixing bolts, the drill bit 100 installed in the drill rod is taken out of the drilling hole to the ground, 10), but it is a simple and inexpensive structure.

In the case of the pull string, the pull string can be lowered to the drill bit 100 at the tip through the drill rod and connected to the extension adjustment key 10 provided in the drill bit 100, so that the operator can manually adjust the pull string have. This drawback may be disadvantageous in that it is not necessary to take the drill bit 100 in the ground to the ground at the time of enlarging and drilling after straight drilling, and pulling the drill bit through the drill bit to the drill bit 100 .

As a position conversion tool that enables automatic operation, it is possible to operate the expansion control key 10 by wire control or wireless control with fluid pressure, solenoid, electromagnet, pull string, push rod, weight, have. In the case of wireless control, the drill bit 100 is mainly provided with a driving unit for driving the expansion control key 10 by using a battery and a battery power source for remote control of the expansion control key 10.

In the present invention, the shank 2 of the drill bit 100 for ground excavation can be configured to be separated into a swivel base 2a and a flange 2b as shown in FIG. That is, the shank 2 is formed by assembling the swivel base 2a and the flange portion 2b as shown in Fig. At this time, the flange portion 2b is fastened to the housing 4 by the fastening pin 12, and only the rotating table 2a can be rotated. The swivel base 2a of the shank 2 is axially connected to the expansion wing cutter 8 via the engagement protrusions and the groove portions 16a and 16b so that the axial rotation of the swivel base 2a is transmitted to the parking passage 17 to the linear movement of the expanding wing cutter 8.

7 shows a strap configuration in a state where the drill bit 100 for ground excavation shown in FIG. 6 is assembled.

1 to 8, the present invention is applicable to a drill bit of a rotary cutting type (auger type) although the drill bit 100 (100A) for drilling ground excavation has been described.

Fig. 16 shows an example of a rotary cut (auger type) drill bit 100C of the present invention. 16 (a) and 16 (b), the bottom of the housing 4 of the drill bit 100C is provided with a cutting cutter 34 connected to the screw 32 ) Are installed.

The structure in which the incising portion is formed in the circumferential wall portion of the rotary cut drill bit housing 4 shown in Fig. 16 and the parking passage tube body 24 is provided to have the expansion wing cutter 8 in the parking passage tube body 24 It shows together.

FIGS. 9 to 12 are views showing that straight drilling and enlarging drilling are possible using one drilling bit 100 for ground drilling according to the present invention.

It should be appreciated that the drill bits of Figures 9-12 are examples of drill bits of "100", but may be replaced by drill bits of "100A", "100B", "100C" instead of drill bit 100.

9 and 11, a drill bit 9 mounted on the bottom of the drill bit 100 is used for direct laying to form a perforation hole, and in enlarged perforation for forming a hole larger than the perforation hole, It can be seen that the wing cutter 8 of FIG.

Fig. 9 shows a case where the drill rod with the drill bit 100 mounted on the tip thereof is the screw drill rod 102a, Fig. 11 shows the case where the drill rod with the drill bit 100 mounted on the tip is inserted into the tubular drill rod 102b, . Both the screw type drill rod 102a and the tubing type drill rod 102b are commonly used in the technical industry. Among them, the screw type drill rod 102a, which is inexpensive in terms of maintenance and cost, is used more frequently.

When the screw type drill rod 102a is used, it is necessary to perform the forward rotation both when the straight hole is opened and when the straight hole is formed due to the structure in which the slime is discharged. Therefore, as shown in FIG. 10, The expanding wing cutter 8 must be disposed so that the wing cutter 8 is opened.

 However, in the case of using the tubing type drill rod 102b as shown in FIG. 11, it is not always necessary to perform the normal rotation when straight drilling and enlarging drilling are performed. Therefore, as shown in FIG. 12, 12 (b) and 12 (b), it is preferable to dispose the extended wing cutter 8 so that the extended wing cutter 8 can be unfolded during the reverse rotation (c).

In the case of using one drilling bit 100 for ground excavation, a straight hole can be used for forming a hole, and a small hole can be used for a casing insertion, etc., and a large hole can be used for a hole For example.

However, there are some inconveniences in the method of using both the straight hole and the enlarged hole by using the expansion adjustment key 10 described with reference to FIGS. 1 to 7 as follows.

When the extension adjustment key 10 is operated manually, the drill bit 100 is recovered to the ground after completion of the direct drilling with the drill bit 100, the expansion control key 10 is moved to the key evacuation groove, Or it is inconvenient to place the extension control key 10 on the ground by installing a pull string between the entire drill rod. In the case of the method of automatically moving the extension control key 10, a battery and a driving unit are required in the drill bit 100, so that the number of parts and devices are increased in the drill bit 100, the equipment cost is increased, In the case of a drill bit, there is a disadvantage that the possibility of failure may also be increased.

In the present invention, the drilling bit 100 for ground excavation has the advantage that it can be used as a straight hole and enlarged hole without the expansion control key 10, (100A) 100B, (100C).

FIGS. 17 and 18 show an example of a recessed cut surface for explaining that the drilling bit 100B for ground excavation has a structure in which the transition between the straight hole and the enlarged hole can be instantaneously made. FIG. 19 is a cross- Sectional view of the drill bit for conversion.

The drill bit 100B for ground excavation shown in FIGS. 17 and 18 is constructed in such a manner that the shank 2 and the housing 4 are slidably slidable up and down, and the shank 2 and the housing 4 are slidably and shrunk, 18 and 19 (b)), the shank 2 and the enlarged wing cutter (Fig. 18 (a) and 19 (b) The rack-pinion type engaging portion of the wing 8 pushes the expanding wing cutter 8 to enable the expansion hole.

More specifically, a lifting hinge 36 having a vertical width equal to the vertical sliding distance is formed around the lower circumference of the shank 2, and two to four pin chains 38 crossing the two side lifting hinge 36 are formed. The lower portion of the shank 2 can be slid up and down by the width of the lift hinge 36 in the groove of the housing 4. [ The lower end of the shank (2) and the groove bottom surface of the housing (4) are fitted to each other by a key-like portion and a key-groove structure in which a shearing force acts.

17 and 18, a key projection 40 such as a "-" or "+" shape is formed at the lower end of the shank 2, Quot; + "-shaped key groove portion 42 to be fitted into the key groove portion 40 is formed.

Therefore, when the drill bit 100B for excavating the ground is pressed using a drill rod or the like for the purpose of direct hole drilling, the shank 2 (2) is inserted into the key groove 42 of the housing 4 as shown in Figs. 17 and 19 The key projecting portion 40 is fitted into the fitting portion. The expanding wing cutter 8 is then unfolded and the shaft torque of the shank 2 is transferred to the housing 4 as it is, with straight drilling by the drill tip 9 at the bottom of the drill bit IOOB.

18, when the drilling rod or the like is used to slightly raise the drilling bit 100B for ground excavation, the shank 2 and the housing 4 are relatively moved The key portion 40 of the shank 2 is pressed against the key groove portion 42 of the housing 4 which is fitted by the self weight of the integral housing 4 and the weight of the bottom body 6 coupled with the housing 4 ). Then, when the shank 2 is rotated for expansion, the expansion wing cutter 8 is unfolded without rotating the housing 4 itself.

However, since the key portion 40 of the shank 2 can be inserted again into the key groove portion 42 formed on the bottom surface of the housing 4, a preventive measure is provided in the present invention.

That is, as shown in FIG. 20, an elastic body 44 such as a spring is provided at the rear portion of the parking passage in the parking passage body 24. The elastic body 44 pushes the rear portion of the expanding wing cutter 8 with an elastic force as soon as the key portion 40 of the shank 2 comes out of the key groove portion 42 of the housing 4. [ 19 (b), as shown in the sectional views of the key groove portion 42 and the key projection portion 40, the key projection portion 4 of the shank 2 slightly rotates by a slight axial rotation of the shank 2. As a result, The key fitting portion 40 of the shank 2 is not fitted back into the key groove portion 42 of the housing 4. As a result,

More preferably, the extended wing cutter 8 is formed to have a length slightly shorter than the parking passage tube 24 in the parking passage tube 24 or the parking passage 17 in the housing 4 as shown in FIG. 20, 44 to secure a sufficient distance that the extended wing cutter 8 can be pushed out.

When the shank 2 rotates rapidly, the enlarged wing cutter 8 is gradually expanded by the enlargement of the perforated hole, and the enlarged drill bit 100B performs the enlarged perforation.

The structure of the drill bit 100B for ground excavation as described above is advantageous in that the drill hole can be drilled immediately after the straight run.

In the description with reference to FIGS. 16 to 20, it is exemplified that the drill bit 100B for ground excavation can be drilled immediately after drilling. However, in the above-described drill bit 100 (100A) for ground excavation, It should be understood that the present invention can be applied so that the drilling can be performed immediately after straight drilling. In the structure in which the parking passage tube body 24 is not provided and the parking passage 17 is formed in the housing 4, the elastic body 44 is provided at the rear portion of the parking passage 17.

In the accompanying drawings, the not-shown reference numeral "28 " is a fluid pressure supply passage for slime treatment.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. Therefore, the scope of the present invention should not be limited by the described embodiments, but should be determined by the scope of claims and equivalents thereof.

The present invention can be used to perform ground excavation with a drill bit by using a single drill bit to expand the drill bit diameter to various diameters as well as straight holes.

(2) -shank (4) -housing
(6) - bottom body (6a) - socket portion
(8) - Extended wing cutter (9) - Drill tip
(10) - Expansion key (11) - Home
(12) - Clamping pin
(14) - fastening member (16a) -engaging projection
(16b) -engaging groove portion (17) - parking passage
(18) - rotation restricting space (20) - stopper
(22) - key receiving groove (24) - parking passage tube body
(26) - engagement pin groove (28) - fluid pressure supply passage for slime treatment
(30) - Stopper function Jaw (32) - Screw
(34) - Cutting Mills (36) - Lifting Grooves
(38) - pin (40) - key
(42) - key groove (44) - elastomer
(100) (100A) (100B) (100C) - Drilling bit for ground excavation

Claims (21)

A drilling bit for ground excavation,
And a shank which is coupled to the drill or hammers and is rotatable about an axis and is connected to the housing by being inserted into an upper groove of the housing and is rotated by an axial torque of the shank, Wherein the shank and the expanding winker are configured such that the shaft rotational force is transmitted in the linear transport direction of the extended wing cutter by one to three engaging projections and groove structures, The drilling bit for ground excavation is characterized in that it can be combined with drilling and expansion drilling.
A drilling bit for ground excavation,
And a shank which is coupled to the drill or hammers and is rotatable about an axis and is connected to the housing by being inserted into an upper groove of the housing and is rotated by an axial torque of the shank, Wherein the shank and the expanding winker have a plurality of engaging projections and a groove structure so that the shaft rotation force is transmitted to the expanding wing cutter in the linear transport direction of the expanding wing cutter So that the drill hole can be used as a drill hole and an enlarged drill hole.
A drilling bit for ground excavation,
A shank coupled to the drill rod or the hammer and rotatable about an axis and connected to the housing by being inserted into an upper groove of the housing; a bottom body coupled to the lower portion of the housing in a replaceable manner, And an expansion wing cutter capable of protruding and retracting through an outer wall portion by an axial rotation force of the shank is received in a parking passage formed in the housing, wherein the shank and the expanding winker have a structure in which the shaft rotation force is expanded Wherein the drill bit is configured to be transmitted in a linear transport direction of the wing cutter, thereby enabling both direct drilling and expansion drilling.
A drilling bit for ground excavation,
A shank coupled to the drill rod or the hammer and rotatable about an axis and connected to the housing by being inserted into an upper groove of the housing; a bottom body coupled to the lower portion of the housing in a replaceable manner, And an expansion wing cutter capable of protruding and retracting through an outer wall portion by an axial rotational force of the shank is accommodated in a parking passage in a parking passage tube body provided in an outer wall cutout portion of the housing, wherein the shank and the expanding winker include at least one engaging projection portion and a groove portion structure Wherein the shaft rotating force is transmitted in a linear transport direction of the extended wing cutter, thereby enabling both straight and expanded drilling.
5. The drill bit for ground excavation according to any one of claims 1 to 4, characterized in that an expansion control key is arranged on the housing to limit the degree of expansion of the enlarged wing cutter.
A drilling bit for ground excavation,
A shank coupled to the drill rod or the hammer and rotatable about an axis and connected to the housing by being inserted into an upper groove of the housing; a bottom body coupled to the lower portion of the housing in a replaceable manner, An extension wing cutter capable of protruding and retracting through the outer wall of the housing by the shaft rotational force of the shank and an expansion adjustment key for limiting the extension of the extension wing cutter are built in the housing, Characterized in that the drill bit for ground drilling is characterized in that:
The drilling bit for ground excavation according to any one of claims 1 to 4, characterized in that the housing is provided with one of three or more extension wing cutters.
A multi-bit system according to any one of claims 1 to 5, wherein a plurality of drill bits are provided in one large tubular body for large diameter drilling, wherein each drill bit has one to three extended wing cutters It is equipped with a bimetallic drilling bit.
The method according to any one of claims 3 to 4, wherein the housing and the bottom body are fastened with a pin or bolt coupling structure which resists shear force together with a track-type fitting structure. Drill bit.
6. The apparatus of claim 5, wherein one of the wall portions of the parking passage accommodating the enlarged wing cutter and the facing wall portion in the housing facing the shank is formed with a key receiving groove capable of operating the expansion control key Drill bits.
11. The drill bit for ground excavation according to claim 10, wherein a degree of expansion of the enlarged wing cutter is defined by adjustment of the width of the enlargement adjustment key corresponding to the key receiving groove.
The drill bit for ground excavation according to claim 10, wherein the operation control of the expansion control key using the key receiving groove is provided with a position conversion tool, and the position conversion tool is activated as one of manual operation and automatic operation.
13. The drilling bit for ground excavation according to claim 12, wherein the shift of the position changing tool is performed by using one of fluid pressure, electric power, shaft rotating force, push rod, pull string, .
The expanding wing cutter according to any one of claims 1 to 4, wherein an enlarged wing cutter is disposed so as to be capable of straight punching by one-directional shaft rotation of the shank and capable of expanding by the expanding wing cutter by rotating in the same direction Featured drill bit for ground excavation.
5. The method according to any one of claims 1 to 4, wherein the straight hole and the enlarged wing cutter can be immersed by the one-way shaft rotation of the shank, and the expansion wedge can be extended by the extended wing cutter by rotating the shank in the reverse direction Wherein an enlarged wing cutter is disposed on the drill bit.
The shank according to any one of claims 1 to 4, wherein the shank and the housing are slidable in a vertically slidable manner, wherein a bottom portion of the shank and a bottom surface of the groove of the housing are fitted with a key- And the shank and the housing are integrally moved while being engaged with each other while the rotation shaft is engaged with the keyhole portion and the keyhole portion in the sliding shrinking state and the shank and the housing are engaged with each other, The shaft rotation of the shank causes the expanding wing cutter to expand in a linear manner to expand the drilling bit for ground drilling.
17. The shank of claim 16, wherein the shank and the housing are vertically slidable, wherein a lift groove is formed around the lower circumference of the shank by an up-and-down sliding distance, and two pin- Wherein the drill bit is fixedly coupled to the ground drill bit.
[18] The method according to claim 16 or 17, wherein the keyhole portion at the lower end of the shank pushes the rear portion of the expanding wing cutter with an elastic force as soon as the keyhole portion is released from the keyhole portion of the housing groove bottom, Wherein the elastic body is installed at a rear portion of a parking passage having an enlarged wing cutter.
The motorcycle according to any one of claims 1 to 4, wherein the shank is separately assembled into a swivel base and a flange, and the flange is fastened to the housing and the swivel base is axially connected to the expansion wing cutter in the parking passage Wherein said drill bit is a drill bit for ground excavation.
The lower end of the shank and the bottom surface of the housing are pressed against each other by a drill bit or an upper drill bit or at least one of a drill hammer and ground equipment with an expanded wing cutter, The shank is integrally rotated with the housing mounted with the drill tip of the bottom, and the shank is directly punched. When the drill bit is pressed or pressed in opposition to the straight release, Wherein the shaft rotating force of the shank linearly moves the expanded wing cutter as the shank rotates in the same direction as the straight hole in the missing state.
The lower end of the shank and the bottom surface of the housing are pressed against each other by a drill bit or an upper drill bit or at least one of a drill hammer and ground equipment with an enlarged wing cutter, The shank is integrally rotated with the housing mounted with the drill tip of the bottom, and is directly punched. When the shank of the shank is depressed or pressed in the opposite direction to the straight release, Wherein the shank rotates in a direction opposite to the straight hole in a direction opposite to the straight hole, and the shaft rotating force of the shank linearly moves the extended wing cutter to expand the hole.

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