A multi-directional drill block

Abstract

The invention provides a technique for simultaneously excavating relative to an excavation surface in a direction of excavation and a direction of a hole wall, or a direction of excavation and a direction of a pile core, or all of these directions. The invention is a multidirectional drill piece 1 mounted on a drill bit, including a base 2 projecting in an axial direction of the drill bit, and leg portions 3 and 4 continuous with the base, the base being composed of a flat portion 2a continuous with the leg portions, first inclined portions 2b to 2d inclined from the flat portion toward an axial front end side of the drill bit, left and right side portions 2e and 2f continuous with the first inclined portions, and a second inclined portion 2g inclined from the first inclined portions toward an axial rear portion side of the drill bit, the first inclined portions, the side portions, and the second inclined portion being provided with a first hard alloy, and a second hard alloy tip projecting in a direction perpendicular to the left and right side portions being provided from one of the left and right side portions to the first inclined portion.

Description

Technical Field

[0001] This invention relates to a multi-directional drill block for drilling simultaneously in multiple directions on a single excavation surface. Background Technology

[0002] In traditional piling methods using tools such as pile drivers, the drill bit is connected to a drive mechanism and is used to excavate foundation holes for buildings or to excavate holes to form continuous underground walls. The drill bit has a cutting edge at its tip for digging. This is essentially the same as methods such as steel pipe construction.

[0003] For example, Patent Document 1 discloses a detachable drill bit whose digging blade consists of a central tip and two side tips, with the digging head welded together. In this detachable drill bit, the central tip forms a wedge-shaped blade that protrudes in a curved manner relative to the side tips. The digging blade employs a self-growing blade function, wherein the cutting edge detaches and regenerates a new cutting edge according to the digging action, and a rod-shaped tip made of superhard alloy is embedded in the cutting edge body of the digging blade.

[0004] Existing technology:

[0005] Patent document 1: Japanese Patent Publication No. 22-339680. Summary of the Invention

[0006] The problem to be solved by this invention

[0007] Patent document 1 only discloses a drill bit with an improved detachable structure.

[0008] A device for drilling bits that can be mounted on the outer or inner plate of the casing, or on both sides of the outer and inner plates, and can simultaneously excavate in the direction of digging and the direction of the borehole wall, or in the direction of digging and the direction of the pile core, or in all of these directions, is currently nonexistent in the art. Similarly, there is no existing device in the art that can be mounted on the outside of the blades of the digging cutter and can simultaneously excavate in the direction of digging and the direction of the borehole wall.

[0009] In view of the above problems, the object of the present invention is to provide a technique for excavating relative to the excavation face in the excavation direction and the borehole wall direction, or the excavation direction and the pile core direction, or all of these directions simultaneously.

[0010] The means to solve the problem

[0011] To solve the above problems, according to the first aspect of the present invention, a multi-directional drill block is a drill block mounted on a drill bit, including a base with its front end protruding in the axial direction of the drill bit, wherein a first cemented carbide tip protruding in the digging direction and a second cemented carbide tip protruding in the direction of the borehole wall or the core are provided at the front end of the base.

[0012] According to a second aspect of the invention, a multi-directional drill block is a drill block mounted on a drill bit, comprising a base portion with its front end projecting axially toward the drill bit, and a leg portion continuous with the base portion. The base portion comprises a planar portion continuous with the leg portion, a first inclined portion inclined from the planar portion toward the drill bit axially and toward the front end side, a side portion continuous to the left and right of the first inclined portion, and a second inclined portion inclined from the first inclined portion toward the drill bit axially and toward the leg side. A first carbide tip is disposed in the first inclined portion, the side portion, and the second inclined portion, and a second carbide tip protruding in a direction perpendicular to the left and right side portions is provided from one of the left and right side portions toward the first inclined portion.

[0013] In the second aspect, the second carbide tip may be configured by a plurality of carbide tips parallel to the axial direction of the drill bit at predetermined intervals.

[0014] Invention Effects

[0015] According to the present invention, it is possible to provide a technique for simultaneously excavating the excavation face in the excavation direction and the borehole wall direction, or the excavation direction and the pile core direction, or all of these directions. Attached Figure Description

[0016] Figure 1 This is a structural diagram of a multi-directional drill block according to the first embodiment of the present invention.

[0017] Figure 2 This is a structural diagram of a multi-directional drill block according to the second embodiment of the present invention.

[0018] Figure 3 This is a structural diagram of a multi-directional drill block according to the third embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram showing the installation method of a multi-directional drill block.

[0020] Figure 5 This is a schematic diagram showing the installation method of a multi-directional drill block.

[0021] [Symbol Explanation]

[0022] 1. Multi-directional drill block; 2. Base; 2a. Planar portion; 2b, 2c, 2d. Inclined portion; 2e, 2f. Side portion; 2g. Inclined portion; 3. Leg; 3a. Hole portion; 4. Leg; 4a. Hole portion; 5. Carbide tip; 6. Carbide tip; 7. Hard alloy weld overlay; 11. Multi-directional drill block; 12. Base; 12a. Planar portion; 12b, 12c, 12d. Inclined portion; 12e, 12f. Side portion; 12g. 13. Inclined portion, 13a. Hole, 14. Leg, 14a. Hole, 15. Carbide tip, 17. Carbide tip, 18. Hard surfacing, 21. Multi-directional drill block, 22. Base, 22a. Planar portion, 22b, 22c, 22d. Inclined portion, 22e, 22f. Side portion, 22g. Inclined portion, 23. Leg, 25. Carbide tip, 26. Carbide tip, 27. Hard surfacing. Specific Implementation

[0023] The construction and operation of the multi-directional drill block according to the first to third embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0024] According to the first to third embodiments of the present invention, the multi-directional drill block is mounted on the outer or inner plate of the casing, or on both sides of the outer and inner plates, and is characterized by simultaneously excavating in the excavation direction and the pile core direction, or simultaneously in all directions. Furthermore, the drill block is mounted on the outer side of the excavation wing, characterized by simultaneously excavating the excavation face along the excavation direction and the borehole wall direction.

[0025] To achieve the above-mentioned functions, the multi-directional drill block is equipped with carbide tips in both the excavation direction and the borehole wall direction, or in both the excavation direction and the pile core direction. The size, shape, installation angle, and number of carbide tips in the excavation direction, borehole wall direction, and pile core direction can be appropriately changed according to the excavation object. The hardness of the carbide tips can be appropriately selected according to the excavation direction, borehole wall direction, pile core direction, and each excavation object. In addition, the installation method of the multi-directional drill block can be either detachable (in embodiments 1 and 2) or welded (in embodiment 3). Embodiments 1 to 3 will be described in detail below.

[0026] <First Embodiment>

[0027] Figure 1 The construction of a multi-directional drill block according to a first embodiment of the present invention is shown and illustrated. Specifically, Figure 1 (a) is a perspective view of the drill block. Figure 1 (b) is a floor plan. Figure 1 (c) is a side view. Furthermore, in Figure 1 In (a), the hard overlay diagram is omitted to clearly show the structure of each part.

[0028] As shown in these figures, the multi-directional drill block 1 consists of a base 2 and two legs 3 and 4 extending from the base 2. In the first embodiment, the base 2 side is also referred to as the front end of the drill block 1, and the legs 3 and 4 sides are also referred to as the mounting side or rear end of the drill block 1. The orientation of the tip is the excavation direction, and the direction perpendicular to the excavation direction is the borehole wall direction or the pile core direction.

[0029] In this context, "pile core direction" refers to the center of the pile core used in the construction of existing piles, cast-in-place piles, steel pipe piles, and other pile foundations, as well as the center of the casing and excavator blades used in various pile extraction and obstacle removal operations. "Borehole wall direction" refers to the outer periphery of the pile in the construction of existing piles, cast-in-place piles, steel pipe piles, and other pile foundations, as well as the outer periphery of the casing and excavator blades used in various pile extraction and obstacle removal operations; that is, the borehole wall of the underground cavity constructed after excavating the ground or obstacles.

[0030] The top of the base 2 has a so-called herringbone shape that protrudes toward the front end of the multi-directional drill block 1 in the axial direction of the drill bit. More specifically, the planar portion 2a of the base 2 of the multi-directional drill block 1 is parallel to the plane of the legs 3 and 4, and on the planar portion 2a of the base 2, three inclined portions 2b, 2c, and 2d that are inclined toward the axial direction of the drill bit and the front end are continuous.

[0031] In this embodiment, when viewed from the axial direction and the front end side of the drill bit, the left end of the inclined portion 2b is continuous with the side portion 2e, and the right end of the inclined portion 2d is continuous with the side portion 2f.

[0032] The inclined portions 2b, 2c, and 2d of the base 2 are sequentially continuous in the transverse direction, i.e., the circumferential direction of the drill bit, when viewed from the axial direction and the front end side of the drill bit. In the first embodiment, the inclined portion 2b is inclined relative to the inclined portion 2c in the circumferential direction of the drill bit, and the inclined portion 2d is inclined relative to the inclined portion 2c in the circumferential direction of the drill bit (in the direction opposite to the inclination direction of the inclined portion 2b).

[0033] The lower ends of the inclined portions 2b, 2c, and 2d of the base 2 are continuous with the inclined portion 2g. The inclined portion 2g of the base 2 forms a 17.5-degree angle with respect to the plane parallel to the flat portion 2a of the base 2, and is inclined toward the axial direction of the drill bit and the rear end side of the multi-directional drill block 1, that is, the drill block 1 is inclined toward the mounting side of the drill bit. A hard weld overlay layer 7 is provided on the base 2.

[0034] Legs 3 and 4 extend parallel to each other from the base 2 toward the axial rear end of the drill bit at a predetermined distance, forming a U-shape when viewed from the side. Each leg 3 and 4 has four holes 3a and 4a for mounting the multi-directional drill block 1 onto the drill bit using bolts or the like.

[0035] A first carbide tip 5 is disposed at the lower part of the inclined portions 2b, 2c, and 2d of the base 2 of the multi-directional drill block 1. The first carbide tip 5 can prevent wear on the outer side of the contact surface. A second carbide tip 6 is disposed from the inclined portion 2d of the base 2 of the multi-directional drill block 1 to the side portion 2f. The second carbide tip 6 has a so-called herringbone shape, with its top facing the borehole wall direction or the pile core direction. The borehole wall direction and the pile core direction are perpendicular to the excavation direction. Therefore, when the multi-directional drill block 1 is disposed on the outer plate of the casing, the second carbide tip 6 faces the borehole wall direction, and when disposed on the inner plate, the second carbide tip 6 faces the pile core direction. The material and hardness of the first and second carbide tips 5 and 6 can be freely combined according to the ground or obstacles of the excavation object.

[0036] For the materials of each component, SCM440 (chromium-molybdenum steel) can be used as the base material for base 2 and legs 3 and 4. The first and second cemented carbide tips 5 and 6 can be made of materials such as E3 (material name MG30), E4 (material name MG40), E5 (material name MG50) and E6 (material name MG60) according to the Japanese JIS steel grade classification method, or G4 (CIS material code VC-40) and G5 (CIS material code VC-50) according to CIS material specifications, and of course, they are not limited to these.

[0037] As described above, the multi-directional drill block according to the first embodiment of the present invention makes it possible to excavate simultaneously in the excavation direction and the borehole wall direction, or the excavation direction and the core direction, or all of these directions relative to the excavation face.

[0038] <Second Embodiment>

[0039] Figure 2 The construction of a multi-directional drill block according to a second embodiment of the present invention is shown. More specifically, Figure 2 (a) is a perspective view of the drill block. Figure 2 (b) is a floor plan. Figure 2 (c) is a side view. Furthermore, in Figure 2 In (a), the diagram of the hard overlay is omitted in order to clearly show the structure of each part.

[0040] As shown in the figure above, the multi-directional drill block 11 consists of a base 12 and two legs 13 and 14 extending from the base 12. In the second embodiment, the base 12 side is also referred to as the front end of the multi-directional drill block 11, and the legs 13 and 14 sides are also referred to as the mounting side facing the drill bit or the rear end of the multi-directional drill block 11. Furthermore, the direction facing the front end is the excavation direction, and the direction perpendicular to this excavation direction is the borehole wall direction or the pile core direction.

[0041] The top of the base 12 has a so-called herringbone shape that protrudes toward the front end of the multi-directional drill block 1 in the axial direction of the drill bit. More specifically, the planar portion 12a of the base 12 of the multi-directional drill block 1 is parallel to the plane of the legs 13 and 4, and three inclined portions 12b, 12c, and 12d that are inclined toward the axial direction of the drill bit and the front end are continuous on the planar portion 12a of the base 12.

[0042] In this embodiment, when viewed from the axial direction and the front end side of the drill bit, the left end of the inclined portion 12b is continuous with the side portion 12e, and the right end of the inclined portion 12d is continuous with the side portion 12f.

[0043] The inclined portions 12b, 12c, and 12d of the base 12 are sequentially continuous in the transverse direction, i.e., the circumferential direction of the drill bit, when viewed from the axial direction and the front end side of the drill bit. In the second embodiment, the inclined portion 12b is inclined relative to the inclined portion 12c in the circumferential direction of the drill bit, and the inclined portion 12d is inclined relative to the inclined portion 12c in the circumferential direction of the drill bit (in the direction opposite to the inclination direction of the inclined portion 12b).

[0044] The lower ends of the inclined portions 12b, 12c, and 12d of the base 12 are continuous with the inclined portion 12g. The inclined portion 12g of the base 12 forms a 17.5-degree angle with respect to the plane parallel to the flat portion 12a of the base 12, and is inclined toward the axial direction of the drill bit and the rear end side of the multi-directional drill block 1, that is, the drill block 11 is inclined toward the mounting side of the drill bit. A hard weld overlay layer 18 is provided on the base 12.

[0045] Legs 13 and 14 extend parallel to each other from the base 12 toward the axial rear end of the drill bit at a predetermined distance, forming a U-shape when viewed from the side. Each leg 13 and 14 has four holes 13a and 14a for mounting the multi-directional drill block 11 onto the drill bit using bolts or the like.

[0046] A first carbide tip 15 is disposed at the lower part of the inclined portions 12b, 12c, and 12d of the base 12 of the multi-directional drill block 11. The first carbide tip 15 can prevent wear on the outer side of the contact surface. Furthermore, from the inclined portion 12d of the base 12 of the multi-directional drill block 11 to the side portion 12f, two second carbide tips 16 and 17 are disposed parallel to each other at a predetermined distance towards the axial rear end of the drill bit. The second carbide tips 16 and 17 have a so-called herringbone shape, with their tops facing the borehole wall direction or the pile core direction. The borehole wall direction and the pile core direction are perpendicular to the excavation direction. Therefore, when the multi-directional drill block 1 is disposed on the outer plate of the casing, the second carbide tips 16 and 17 face the borehole wall direction, and when disposed on the inner plate, the second carbide tips 16 and 17 face the pile core direction. The material and hardness of the first and second carbide tips 15, 16, and 17 can be freely combined according to the ground or obstacles of the excavation target.

[0047] For the materials of each component, SCM440 (chromium-molybdenum steel) can be used as the base material for the base 12 and the legs 13 and 14. The first and second cemented carbide tips 15, 16, and 17 can be made of materials such as E3 (material name MG30), E4 (material name MG40), E5 (material name MG50), and E6 (material name MG60) according to the Japanese JIS steel grade classification method, or G4 (CIS material code VC-40) and G5 (CIS material code VC-50) according to CIS material specifications, and of course, they are not limited to these.

[0048] As described above, the multi-directional drill block according to the second embodiment of the present invention makes it possible to excavate simultaneously in the excavation direction and the borehole wall direction, or the excavation direction and the core direction, or all of these directions relative to the excavation face.

[0049] <Third Embodiment>

[0050] Figure 3 The construction of a multi-directional drill block according to a third embodiment of the present invention is shown. More specifically, Figure 3 (a) is a perspective view of the drill block. Figure 3 (b) is a floor plan. Figure 3 (c) is a side view. Furthermore, in Figure 3 In (a), the diagram of the hard overlay is omitted in order to clearly show the structure of each part.

[0051] As shown in the figure above, the multi-directional drill block 21 consists of a base 22 and two legs (also called welded portions) 23 extending from the base 22. In the first embodiment, the base 22 side is also referred to as the front end of the multi-directional drill block 21, and the welded portion 23 side is also referred to as the mounting side facing the drill bit or the rear end of the multi-directional drill block 21. Furthermore, the direction facing the front end is the excavation direction, and the direction perpendicular to the excavation direction is the borehole wall direction or the pile core direction.

[0052] The top of the base 22 has a so-called herringbone shape that protrudes toward the front end of the multi-directional drill block 21 in the axial direction of the drill bit. More specifically, the planar portion 22a of the base 22 of the multi-directional drill block 21 is parallel to the plane of the leg 23, and three inclined portions 22b, 22c, and 22d that are inclined toward the axial direction of the drill bit and the front end are continuous on the planar portion 22a of the base 22.

[0053] In this embodiment, when viewed from the axial direction and the front end side of the drill bit, the left end of the inclined portion 22b is continuous with the side portion 22e, and the right end of the inclined portion 22d is continuous with the side portion 22f.

[0054] The inclined portions 22b, 22c, and 22d of the base 22 are sequentially continuous in the transverse direction, i.e., the circumferential direction of the drill bit, when viewed from the axial direction and the front end side of the drill bit. In the third embodiment, the inclined portion 22b is inclined relative to the inclined portion 22c in the circumferential direction of the drill bit, and the inclined portion 22d is inclined relative to the inclined portion 22c in the circumferential direction of the drill bit (in the direction opposite to the inclination direction of the inclined portion 22b).

[0055] The lower ends of the inclined portions 22b, 22c, and 22d of the base 22 are continuous with the inclined portion 22g. The inclined portion 22g of the base 22 forms a 15-degree angle with respect to the plane parallel to the flat portion 12a of the base 22, and faces the axial direction of the drill bit and the rear end side of the multi-directional drill block 21, that is, the drill block 21 is inclined towards the mounting side of the drill bit. A hard weld overlay layer 27 is provided on the base 22. The protruding foot 23 extending from the base 22 toward the rear end is the welded part for fixing the drill block 1 to the drill bit.

[0056] A first carbide tip 25 is disposed at the lower part of the inclined portions 22b, 22c, and 22d of the base 22 of the multi-directional drill block 21. The first carbide tip 25 can prevent wear on the outer side of the contact surface. Furthermore, a second carbide tip is disposed from the inclined portion 22d of the base 22 of the multi-directional drill block 21 to the side portion 22f. The second carbide tip 26 has a so-called herringbone shape, with its top facing either the borehole wall direction or the pile core direction. The borehole wall direction and the pile core direction are perpendicular to the excavation direction. Therefore, when the multi-directional drill block 1 is disposed on the outer plate of the casing, the second carbide tip 26 faces the borehole wall direction; when disposed on the inner plate, the second carbide tip 26 faces the pile core direction. The material and hardness of the first and second carbide tips 25 and 26 can be freely combined according to the ground surface or obstacles of the excavation target.

[0057] For the materials of each component, SCM440 (chromium-molybdenum steel) can be used as the base material for the base 22 and the leg 23. The first and second cemented carbide tips 25 and 26 can be made of materials such as E3 (material name MG30), E4 (material name MG40), E5 (material name MG50) and E6 (material name MG60) in the Japanese JIS steel classification method, or G4 (CIS material code VC-40) and G5 (CIS material code VC-50) in the CIS material specifications, and of course, they are not limited to these.

[0058] As described above, the multi-directional drill block according to the third embodiment of the present invention makes it possible to excavate simultaneously in the excavation direction and the borehole wall direction, or the excavation direction and the core direction, or all of these directions relative to the excavation face.

[0059] under Figure 4 The diagram shows the first and second multi-directional drill blocks of the present invention installed on the casing, and their effects will be described in detail. Specifically, Figure 4(a) is a perspective view showing the installation status. Figure 4 (b) is a plan view showing the installation status. Figure 4 (c) is a side view showing the installation state.

[0060] As shown in the figure above, when the multi-directional drill bit is installed on the outer plate of the casing and used, the first cemented carbide tip installed in the excavation direction excavates along the excavation direction, while the second cemented carbide tip installed on the borehole wall side alleviates the soil pressure and friction from the borehole wall side, thereby increasing the pile diameter. The pile diameter can be changed by altering the size of the second cemented carbide pump end installed in the borehole wall direction.

[0061] The second carbide tip installed on the side facing the borehole wall assists in raking the excavated soil excavated by the first carbide tip installed in the excavation direction from the excavation face, thereby easing the soil pressure and friction on the front end of the casing and improving excavation efficiency.

[0062] In addition, the second carbide tip installed on the side facing the borehole wall produces a threaded-in effect in the rotational direction when digging the borehole wall, which improves the digging force.

[0063] In addition, in obstacle removal excavation, by excavating further outwards by installing a second carbide tip in the hole wall direction and a second carbide tip in the excavation direction, it is possible to ensure an expanded excavation width, thereby increasing the scale of obstacle removal excavation simply by installing multi-directional drill blocks.

[0064] By varying the number of second carbide tips installed along the borehole wall direction, the excavation path becomes more uniform, thus achieving the effect of increasing the pile diameter or removing the diameter of obstacles. For example, in the illustrated example, the second carbide tips installed along the borehole wall direction are alternately installed on one multi-directional drill block 1 and two multi-directional drill blocks 11.

[0065] Furthermore, by installing a second carbide tip on the side facing the borehole wall, the load applied to the outside of the casing is reduced, thus increasing the durability of the casing itself.

[0066] On the other hand, when the drill block is installed on the inner plate of the casing, the first carbide tip installed in the excavation direction digs along the excavation direction, while the second carbide tip installed on the pile core direction side mitigates the soil pressure and friction from the pile core side.

[0067] The second hard alloy tip installed on the side of the pile core direction assists in raking the excavated soil excavated by the first hard alloy tip installed in the excavation direction from the excavation face, thereby easing the soil pressure and friction from the front end of the casing, improving excavation efficiency, and at the same time improving the efficiency of removing excavated soil from the inside of the casing.

[0068] In addition, the second carbide tip installed on the pile core side produces a threaded-in effect in the rotation direction when it is inside the excavation casing, which improves the digging force.

[0069] In obstacle removal excavation, by excavating further inside the casing using a second carbide tip mounted in the core direction and another carbide tip mounted in the excavation direction, the excavation width can be expanded. This allows for a reduction in the size of obstacles inside the casing simply by installing this multi-directional drill block, thus improving obstacle removal efficiency. Furthermore, the size of the obstacle can be reduced by arbitrarily changing the size of the second carbide tip mounted in the core direction.

[0070] By varying the number of second carbide tips installed along the core direction, the excavation path can be made more uniform, thus allowing for more efficient removal of excavated soil and obstacles. For example, in the example shown in the figure, the tips installed along the core direction can be alternately installed on one multi-directional drill block 1 and two multi-directional drill blocks 11.

[0071] Furthermore, by installing a second carbide tip along the direction of the pile core, the load applied to the inside of the casing is reduced, thus improving the durability of the casing itself.

[0072] Figure 5 The first and second multi-directional drill blocks of the present invention are shown mounted on the outside of a spiral drill bit (also known as the blade wing of a digging blade), and their effects will be explained. Figure 5 (a) is a side view showing the multi-directional drill block mounted on the drill bit. Figure 5 (b) is a plan view showing the state of the multi-directional drill block mounted on the drill bit.

[0073] As shown in the diagram above, when the multi-directional drill block is installed on the outside of the excavating blade's blade and used, the first cemented carbide tip installed along the excavation direction digs along that direction, while the second cemented carbide tip installed on the borehole wall side alleviates soil pressure and friction from the borehole wall side, thus increasing the pile diameter. Furthermore, the pile diameter can be changed by altering the size of the second cemented carbide tip installed on the borehole wall side.

[0074] In addition, the second carbide tip installed on the side facing the borehole wall increases the biting force in the digging direction and improves digging efficiency by leveraging the screw-in effect on the rotational side when digging the borehole wall.

[0075] Furthermore, since the first and second carbide tips installed in both the digging direction and the borehole wall direction dig simultaneously, the amount of excavated soil scooped up by the auger of the digging blades is increased, thus improving digging efficiency. By installing the second carbide tip on the borehole wall direction side, the load applied to the digging blades is reduced, thereby improving the durability of the digging blades themselves.

[0076] The first to third embodiments of the present invention have been described above, but the present invention is not limited thereto, and various improvements and modifications can be made without departing from the spirit of the present invention.

[0077] For example, the multi-directional drill block for casing auger drilling according to this embodiment can be used in construction, for example, existing pile construction methods or hollow steel pipe construction methods, and the damage, slippage and wear of the carbide tip are reduced during construction compared with the prior art.

Claims

1. A multi-directional drill block, wherein the multi-directional drill block is mounted on a drill bit, and the multi-directional drill block comprises: It has a base with its front end projecting axially toward the drill bit, and Legs that are continuous with the base. The base consists of a flat portion continuous with the leg portion, a first inclined portion inclined from the flat portion toward the axial front end of the drill bit, a left face portion continuous with the left side of the first inclined portion, a right face portion continuous with the right side of the first inclined portion, and a second inclined portion inclined from the first inclined portion toward the axial leg portion of the drill bit. A first cemented carbide tip is disposed in the first inclined portion and the second inclined portion, and a second cemented carbide tip protruding in a direction perpendicular to the left and right side portions is provided from one of the left and right side portions to the first inclined portion. The first inclined portion includes a plurality of inclined portions that are inclined from the planar portion toward the front end side. The plurality of inclined portions are continuous in the circumferential direction of the multi-directional drill block, and The second cemented carbide tip is disposed on a plurality of inclined portions.

2. The multi-directional drill block according to claim 1, characterized in that, The second carbide tip may be composed of a plurality of carbide tips arranged parallel to the axial direction of the drill bit at predetermined intervals.

3. The multi-directional drill block according to claim 1, characterized in that, The first cemented carbide tip is disposed on the front end side of the first inclined portion, and The second cemented carbide tip is disposed between the first cemented carbide tip and the planar portion.

4. The multi-directional drill block according to claim 1, characterized in that, The first carbide tip is configured to protrude in the axial direction of the drill block.

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