JP2005188179A - Drilling bit and core material burying construction method using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drilling bit and a core material burying construction method using it, which enable an improvement in construction work and a reduction in construction cost, in terms of drilling work and the construction method for burying a core material such as a rock bolt into ground. <P>SOLUTION: This drilling bit is attached to a tip part of a casing rod into which the core material 7 can be inserted. The drilling bit is equipped with: a ring bit 1 wherein blade bodies 11 and 11 are annularly planted; a blade body block 2 wherein is arranged with a gap in between on an inner periphery surrounded by the ring bit, and wherein the blade bodies are planted almost in a straight line or in the shape of a cross; and an engaging part 21 which is engaged with the casing rod. The ring bit 1 is partially notched, and at least first and second notched parts 14 and 15 are formed. One end of the blade body block 2 is rotatably journaled on the first notched part 14 of the ring bit 1, and the other end thereof is temporarily fixed to the second notched part 15 of the ring bit by means of a temporary pin 5. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a drill bit and a core material embedding method using the same.

  When embedding a core material such as a lock bolt on the ground such as a slope, conventionally, an inner casing rod is inserted into an outer casing rod having a double-pipe structure, and a bit is attached to the tip of the inner casing rod. Drilling while applying blow and rotation. However, the outer casing rod and inner casing rod having the double pipe structure are structurally complicated, have poor drilling work efficiency, and increase the construction cost.

  At the same time, when inserting the lock bolt or injecting the grout material, it is necessary to first pull out the inner casing rod from the drilled hole, then inject the lock bolt or grout material, and then pull out the outer casing rod. The work was complicated.

Therefore, a conventional drilling device that improves the conventional drilling method, attaches a drilling bit with a lid that can be opened and closed at the tip of the outer casing rod, and drills with only this outer casing rod is proposed. (For example, refer to Patent Document 1).
JP 2002-21373 A (pages 3 and 5; FIGS. 1 to 3 and FIGS. 9 to 12)

  The above proposal is excellent in that an inner casing rod is not required and an operation of pulling out the inner casing rod is unnecessary. However, the lid located at the head of the drilling bit is held in the closed state (the lid is closed) by the spring, but this spring is easily clogged with slime, etc. As a result, the closure of the lid worsens, the lid opens during the drilling operation, and the slime entering the casing rod increases, thus reducing the efficiency of the excavation operation. For this reason, it is necessary to frequently replace or clean the drilling bit itself, so that improvement of the construction work cannot be achieved as expected, and the construction cost has been raised.

  Therefore, the main problem of the present invention is a drilling bit and a drilling bit that can improve the construction work and reduce the construction cost in the construction method for embedding a core material such as a drilling work and a rock bolt in the ground. It is to provide a core material burying method used.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
The invention according to claim 1 is a drill bit that is attached to a tip portion of a casing rod into which a core material can be inserted, and the drill bit is a ring bit in which a blade is planted in an annular shape A blade block disposed with a gap on the inner periphery surrounded by the ring bit and having a blade body implanted in a substantially single or cross shape, and an engaging portion that engages with the casing rod. The ring bit is partially cut out, and at least first and second cutout portions are formed. The blade block has one end and the other end at the ring. A drilling bit characterized in that the first and second cutout portions of the bit are each temporarily fixed by temporary pins.

(Function and effect)
In the blade block in which the blade body is implanted in a substantially one-letter shape or a cross-shape, one end portion and the other end portion thereof are temporarily fixed to the first and second cutout portions of the ring bit by temporary pins, respectively. It is a configuration. Therefore, by inserting a core material such as a steel rod from the base end side of the casing rod and applying an external force such as pressing or striking the core material, the temporary pin comes off or breaks (ie, temporarily fixed) Is released), the blade block is detached from the ring bit, and the core material or the like can be projected from the tip end side of the casing rod. At this time, since the invention according to the present invention does not have a configuration that requires a spring, the temporarily fixed state is not inadvertently released or not released due to clogging of slime or the like. In other words, the temporary pin is maintained temporarily during the excavation operation unless an external force such as pressing or striking the core material is applied, so there is no risk that the blade block will come off during the excavation operation. The temporary fixing state of the temporary pin (release of the temporary pin, breakage, etc.) is released by an external force such as pressing or striking the material, and the blade block can be reliably removed from the ring bit. Furthermore, since there is a gap between the ring bit and the inner peripheral surface, if air or water is supplied into the casing rod when drilling, work can be performed while air or water is ejected from the gap. As a result, the drilling efficiency can be improved. Further, when the grout material is supplied, the grout material can be discharged from the gap.

<Invention of Claim 2>
The invention according to claim 2 is a drill bit that is attached to a tip portion of a casing rod into which a core material can be inserted, and the drill bit is a ring bit in which a blade is planted in an annular shape A blade block disposed with a gap on the inner periphery surrounded by the ring bit and having a blade body implanted in a substantially single or cross shape, and an engaging portion that engages with the casing rod. The ring bit is partially cut out, and at least first and second cutout portions are formed, and the blade block has one end thereof at the first of the ring bit. A drill bit characterized in that it is pivotally supported by a notch portion of the ring bit and the other end portion is temporarily fixed to a second notch portion of the ring bit by a temporary pin. .

(Function and effect)
In the blade block in which the blade body is implanted in a substantially one-letter shape or a cross-shape, one end portion and the other end portion thereof are temporarily fixed to the first and second cutout portions of the ring bit by temporary pins, respectively. It is a configuration. Therefore, by inserting a core material such as a steel rod from the base end side of the casing rod and applying an external force such as pressing or striking the core material, the temporary pin comes off or breaks (ie, temporarily fixed) Is released), the blade block is pushed outward with the shaft support portion as the center, and the core material or the like can be protruded from the tip end side of the casing rod. At this time, since the invention according to the present invention does not have a configuration requiring a spring, the temporarily fixed state is not inadvertently released or not released due to clogging of slime or the like. In other words, the temporary pin is maintained temporarily during the excavation operation unless an external force such as pressing or striking the core material is applied, so there is no risk that the blade block will come off during the excavation operation. The temporary fixing state of the temporary pin (release or breakage of the temporary pin, etc.) is released by an external force such as pressing or striking the material or the like, and the blade block can be reliably pushed outward with the shaft support portion as the center. Furthermore, since there is a gap between the ring bit and the inner peripheral surface, if air or water is supplied into the casing rod when drilling, work can be performed while air or water is ejected from the gap. As a result, the drilling efficiency can be improved. Further, when the grout material is supplied, the grout material can be discharged from the gap.

<Invention of Claim 3>
According to a third aspect of the present invention, the blade body block is attached with a lid that is formed of a plate material having a smaller diameter than the inner periphery of the ring bit and a gap is formed between the blade bit and the ring bit. The drilling bit according to claim 1 or 2.

(Function and effect)
The blade block is made of a plate material having a diameter smaller than the inner periphery of the ring bit, and a gap is formed between the ring bit and the cover body is attached. It is possible to prevent the slime from entering the casing rod at the time of drilling. And by attaching a cover body, the area which applies a core material etc. will increase, and it will become easy to cancel | release the temporarily fixed state of a temporary pin. In addition, since there is a gap between the lid body and the inner peripheral surface of the ring bit, when air or water is supplied into the casing rod when drilling, air or water is ejected from the gap. Work can be performed, and the drilling work efficiency can be improved. Furthermore, when supplying the grout material, the grout material can be discharged from the tip of the drilling bit while preventing the slime from entering due to the presence of the lid.

<Invention of Claim 4>
In the invention according to claim 4, the temporary fixing by the temporary pin is released by applying an external force to the blade block or the lid body of the core member inserted into the casing rod,
4. The structure according to claim 1, wherein the blade block is released from the drill bit or is pushed open about the shaft support portion by the release, and the core member protrudes to the outside. 5. It is a drilling bit as described.

(Function and effect)
If the core material that is finally embedded in the drilling hole is used as a means for releasing the temporary fixing instead of a member (iron bar or the like) as the releasing means, the temporary fixing release process and the core material embedding process are wrapped It is possible to improve the construction efficiency.

<Invention of Claim 5>
The invention according to claim 5 is the drill bit according to any one of claims 1 to 4, wherein the core member is formed of a lock bolt.

(Function and effect)
If the core material is a lock bolt, the lock bolt method can be employed.

<Invention of Claim 6>
The invention according to claim 6 is a core material embedding method using the drilling bit according to any one of claims 1 to 5, wherein the drilling bit is connected to a tip portion of a casing rod. In the state, a first step of drilling the ground to a desired depth by rotation or blow or rotation and blow applied to the casing rod, and a core material is inserted into the casing rod, and external force is applied by the core material. By adding, the blade block is removed from the drill bit, or pushed open with its pivotal support as the center, and the drill bit and casing rod are pulled out with the core projecting to the outside, And a second step of leaving the core material in the drilled hole. A core material burying method characterized by comprising:

<Invention of Claim 7>
According to a seventh aspect of the present invention, in the first step, air or water, or air and water is supplied into the casing rod, and the air or water or air and water are ejected from the gap of the drill bit. The core material embedding method according to claim 6, wherein the drilling is performed while the drilling is performed.

<Invention of Claim 8>
In the invention according to claim 8, the grout material is supplied into the casing rod between the first step and the second step or in the second step, and the grout material is supplied to the drill bit. The core material embedding method according to claim 6 or 7, further comprising a step of discharging from the gap, wherein the core material is fixed in the ground by the grout material.

(Function and effect)
According to the sixth to eighth aspects of the present invention, the core material embedding method can be performed only with the outer casing rod without using the inner casing rod, and the drilling bit according to the present invention requires a spring. Therefore, the temporary fixing state is not inadvertently released or not released due to clogging of slime or the like, so that the drilling work efficiency can be improved.

  If the core material that is finally embedded in the drilling hole is used as a means for releasing the temporary fixing instead of a member (iron bar or the like) as the releasing means, the temporary fixing release process and the core material embedding process are wrapped. Thus, the construction efficiency can be further improved.

According to the present invention, in the construction method in which a core material such as a drilling operation and a rock bolt is embedded in the ground, there are advantages that the construction operation can be improved and the construction cost can be reduced.

Embodiments of the present invention will be described below.
<Embodiment of drill bit>
A first embodiment of a drill bit according to the present invention will be described mainly with reference to FIGS. 1 is a longitudinal sectional view and a side view of a drill bit equipped with the blade block according to the first embodiment, FIG. 2 is a transverse sectional view of the drill bit, and FIG. 3 is a blade body. FIG. 4 is a perspective view of the drill bit according to the first embodiment, and FIG. 5 is a perspective view showing a state where the blade block of the drill bit is pushed open. FIG. 6 is a perspective view of the blade block.
The drilling bit according to the first embodiment includes a ring bit 1, a substantially cross-shaped blade block 2, a pivot pin 4, and a temporary pin 5. The ring bit 1 has a head portion 10 and a base portion 20. Among them, as shown in FIGS. 1 and 4, blade portions 11, 11,... The base 20 is connected to the rear of the head 10. On the outer peripheral surface of the base portion 20, a thread is screwed as an engaging portion 21, and the casing rod 6 provided with a female screw is engaged via the engaging portion 21.

The head 10 of the ring bit 1 will be described in detail below. The above-mentioned blade bodies 11, 11,... Are planted on the head 10 at a predetermined interval, but the valleys 12, 12,... Where these blade bodies 11, 11,. Grooves 13, 13,... Are formed on the side surfaces (head side surfaces). These grooves 13, 13,... Are for discharging slime during drilling. Further, a part of the valleys 12, 12,... Is cut out to support or temporarily fix a blade block 2 described later, and first and second cutouts 14, 15 are formed. .
And the 1st and 2nd head axis holes 16 and 17 which penetrate these 1st and 2nd notch parts 14 and 15 so as to be substantially orthogonal are formed in the side of head 10. As shown in FIGS. 1 and 4, the first and second head shaft holes 16, 17 are behind the base ends of the blade bodies 11, 11,... To dodge the blade bodies 11, 11,. It is formed at the position. Therefore, the depth of the cutout for forming the first and second cutout portions 14 and 15 depends on the positions of the first and second head shaft holes 16 and 17, and at least these positions. It is notched to the back (deep).

  The blade block 2 includes a base portion 30 whose plane is substantially cross-shaped, and blade bodies 31, 31,... Planted on the base portion 30 at a predetermined interval. The base portion 30 has a long side base portion 30a having both ends extending to the outer peripheral surface of the ring bit 1 and a long side base portion 30a orthogonal to the long side base portion 30a. It consists of a short side base portion 30b having a length excluding the gap S. First and second block shaft holes 32 and 33 are formed at both ends of the long side base portion 30a, and communicate with the first and second head shaft holes 16 and 17, respectively. The pivot pin 4 and the temporary pin 5 can be inserted. As shown in FIG. 6, the blade bodies 31, 31,... Of the blade body block 2 have button-like or mountain-shaped tips. And the height from the bottom face of the base part 30 to the blade body 31 is substantially the same length as the thickness of the front-end | tip part of the ring bit 1, as shown in FIG. In addition, according to the construction situation etc., it may replace with the blade block 2 whose plane is substantially cross-shaped, and may use the blade block whose plane is substantially single-character.

  The lid 3 is attached to the bottom surface of the base portion 30 by welding or the like. As shown in FIG. 2, the lid 3 is made of a plate material having a smaller diameter than the inner periphery of the ring bit 2 so that a gap S is formed between the lid 3 and the lid 3. A part of the body 3 is notched to form notches 3a and 3a. For this reason, the portion where the cutouts 3 a and 3 a are formed has a gap larger than the gap S formed between the inner periphery of the ring bit 1. This lid 3 can prevent slime from entering the casing rod during drilling. In addition, since there is a gap S (a gap larger than the gap S in the portion where the notches 3a and 3a are present, the same applies hereinafter) between the lid 3 and the inner peripheral surface of the ring bit, If air or water is supplied into the casing rod 6, the work can be performed while air or water is ejected from the gap S, and the drilling efficiency can be improved. Further, when the grout material is supplied, the grout material can be discharged from the gap S while preventing the slime from entering due to the presence of the lid 3. Here, the notches 3a and 3a are formed in order to increase the ejection amount and discharge amount of air, water, and grout material per unit time, thereby further improving the construction efficiency. Although not shown, when the blade block 2 itself is large (for example, the blades 31, 31,... The lid 3 is not necessarily required in the case where it can be prevented. Further, even when the lid 3 is attached, the notches 3a and 3a may not necessarily be necessary due to the relationship between the ejection amount and discharge amount of air, water and grout material per unit time. Further, the attachment position of the lid 3 may not be the bottom surface of the base portion 30 but the side surface of the base portion 30.

  The pivot pin 4 is made of a metal that is substantially cylindrical and harder than at least aluminum. As shown in FIG. 2, the shaft support pin 4 is inserted from the first head shaft hole 16 from the 16a side, and after being inserted, the set screw 40 screwed with a male screw is screwed. Fixed. In addition, since the hole diameter on the 16b side is smaller than the diameter of the pivot pin 4, the pivot pin 4 does not fall out. Then, the long side base portion 30 a of the blade block 2 is fitted into the first cutout portion 14 of the ring bit 1, and the pivot pin 4 is inserted into the first head shaft hole 16 and the first block shaft hole 32. The blade block 2 is pivotally supported by the first cutout portion 14 by inserting the set screw 40 and screwing the set screw 40. Here, the height from the bottom surface of the base portion 30 to the blade body 31 is substantially the same as the thickness of the tip portion of the ring bit 1 as shown in FIG. This is because the block 2 is rotated at least 90 degrees from the state before the rotation, and the core material 7 inserted into the casing rod 6 is easily protruded from the tip as shown in FIG. This is because if it becomes longer than the thickness of the tip portion of the ring bit 1, it cannot be rotated by 90 degrees, and the core material 7 may be difficult to come out from the tip. In addition, it is preferable to insert a sealing material such as rubber on the 16b side of the first head shaft hole 16 so that slime does not enter.

  The temporary pin 5 is substantially cylindrical and has grooves 5a and 5a formed in the middle part of its side surface, and is made of aluminum or the like. As shown in FIG. 2, the temporary pin 5 is inserted from the second head shaft hole 17 from the 17a side and, after being inserted, fixed by screwing a set screw 40 in which a male screw is engraved. Is done. Since the hole diameter on the 17b side is smaller than the diameter of the temporary pin 5, the temporary pin 5 will not fall out. Then, the long side base portion 30 a of the blade block 2 is fitted into the second cutout portion 15 of the ring bit 1, and the temporary pin 5 is inserted into the second head shaft hole 17 and the second block shaft hole 33. By inserting and screwing the set screw 40, the blade body block 2 is temporarily fixed to the second cutout portion 14. Here, the grooves 5a, 5a formed on the side surface of the temporary pin 5 are positioned at the boundary between the blade block 2 and both side surfaces of the second notch 15, and are inserted into the casing rod. When the core material 7 or the like applies an external force such as striking or pressing to the blade block 2 or the lid 3, shear stress is concentrated in the grooves 5 a and 5 a, and as a result, the temporary pin 5 is broken. As a result, the temporarily fixed state is released, and the blade block 2 is pushed outward with the shaft support portion (the first block shaft hole 32 portion into which the shaft support pin 4 is inserted) as the center, and the core material 7 and the like. Protrudes to the outside. In addition, it is preferable to insert a sealing material such as rubber on the 17b side of the second head shaft hole 17 so that slime does not enter.

  Instead of the temporary pin 5 made of aluminum or the like, an elastic member such as rubber can be inserted into the second head shaft hole 17 and the second block shaft hole 33. In this case, it is preferable to insert the elastic member so as to penetrate from the 17a side to the 17b side of the second head shaft hole 17. Then, the core member 7 or the like inserted into the casing rod applies an external force such as striking or pressing to the blade block 2 or the lid 3, and the elastic member is removed or broken.

Further, as a modification of the blade block 2 of the drilling bit of the first embodiment, as shown in FIGS. 7 to 110, a blade block 102 according to the second embodiment can be proposed. . 7 is a longitudinal sectional view and a side view of a drill bit equipped with the blade block of the second embodiment, FIG. 8 is a transverse sectional view of the drill bit, and FIG. FIG. 10 is a plan view and a side view of the blade block according to the second embodiment, and FIG. 10 is a perspective view of the blade block according to the second embodiment.
The drill bit using the blade block 102 has a smaller diameter than the drill bit of the first embodiment and is downsized as a whole. The blade block 102 includes a base portion 130 whose plane is substantially a single character, and blade bodies 131, 131,... Planted on the base portion 130 at a predetermined interval. The base portion 130 has a length at both ends to the outer peripheral surface of the ring bit 1. First and second block shaft holes 132 and 133 are formed at both ends of the base portion 130, respectively, and communicate with the first and second head shaft holes 16 and 17, respectively. And the temporary pin 5 can be inserted. The blade bodies 131, 131,... Of the blade body block 102 have button-like or mountain-shaped tips. The height from the bottom surface of the base portion 130 to the blade body 131 is substantially the same as the thickness of the tip portion of the ring bit 1 as shown in FIG. A lid 103 is attached to the bottom surface of the base portion 130. The lid 103 is made of a plate material having a smaller diameter than the inner periphery of the ring bit 2 so that a gap S is formed between the lid bit 2 and, unlike the lid 3, a part thereof is cut away. Although not written, a notch may be provided in consideration of the construction situation. Furthermore, as shown in FIG. 8, the groove 5a of the temporary pin 5 has one groove as the drill bit is downsized. In addition, although it does not illustrate in place of the blade block 102 whose plane is substantially one letter, a blade block whose plane is substantially cross-shaped can be proposed according to the construction situation or the like. About others, since it is substantially the same as the blade body block 2, description is abbreviate | omitted.

Furthermore, as a modification of the blade block 102, as shown in FIGS. 11 and 12, a blade block 202 according to the third embodiment can also be proposed. FIG. 11 is a longitudinal sectional view and a side view of a drill bit equipped with the blade block of the third embodiment, and FIG. 12 is a side view of the blade block of the third embodiment.
The blade body block 202 includes a base portion 230 having a substantially single plane shape, and blade bodies 231, 231,... Planted on the base portion 230 at a predetermined interval. The base portion 230 has a length at both ends up to the outer peripheral surface of the ring bit 1. First and second block shaft holes 232 and 233 are formed at both ends of the base portion 230, and communicate with the first and second head shaft holes 16 and 17, respectively. 5 can be inserted. The blades 231, 231,... Of the blade block 202 have a button shape or a mountain shape at the tip. The height from the bottom surface of the base portion 230 to the blade body 231 is higher than that of the blade body block 2 and the blade body block 102 as shown in FIG. In the state at the time of excavation fitted to the two notches 14 and 15, the height is substantially the same as or slightly higher than the tips of the blades 11, 11,.

  Because of the height of the blade block 202, even if the blade block 202 tries to push outward by rotation like the blade block 2 or the blade block 102, it collides with the inner wall of the hole and is difficult to rotate. The core material 7 cannot be protruded from the tip. Therefore, in the case of the blade block 202, by using the temporary pins 5 and 5 to be inserted into the respective block shaft holes, by applying an external force such as striking or pressing to the blade block 202 or the lid 3, The temporary pins 5 and 5 are broken, and the blade block 202 is detached from the ring bit 1 (extruded into the hole), and the core material 7 and the like are projected to the outside. These temporary pins 5 and 5 may be elastic members. In addition, although not shown in the drawing, the blade block having a substantially cross-shaped plane can be proposed according to the construction situation or the like, instead of the blade block 202 having a substantially single-shaped plane. About others, since it is substantially the same as the blade body block 2 and the blade body block 102, description is abbreviate | omitted. Note that the method of using the temporary pins 5 and 5 to remove the ring bit 1 from the ring bit 1 to the outside is not limited to the blade block 202 but also in the blade block 2 and the blade block 102. Applicable.

<Core material embedding method using drill bit according to the present invention>
One example of the core material embedding method using the drilling bit of the first embodiment among the drilling bits according to the present invention will be described with reference to FIGS. 13 and 17. 13 is an explanatory diagram for explaining the drilling operation, FIG. 14 is an explanatory diagram for explaining the grout material injection operation, and FIGS. 15 and 16 explain the push-out of the blade block. FIG. 17 is an explanatory view showing a core material embedded state.
First, the casing rod 6 to which the drilling bit according to the present invention is attached is rotated or blown by a drifter (not shown) or the like, and rotated and blown and propelled, and as shown in FIG. A hole H having a depth is drilled. In this drilling, air or water, or air and water is supplied into the casing rod 6 from the base end side, and the supplied air or water, or air and water is directed from the gap S to the face of the drilling hole. Is ejected. The air or water or the air and water discharges the slime from the hole H, and the blades 11, 11,..., 31, 31,. To be cooled.

  When the hole H having a desired depth is drilled, a drifter or the like is removed from the casing rod 6, and an injection pipe 8 for an injection material such as a grout material is inserted from the base end side of the casing rod 6 as shown in FIG. Inserting into the casing rod 6, the tip of the injection tube 8 reaches the vicinity of the tip of the casing rod 6. Then, the grout material is injected into the casing rod 6 through the injection pipe 8 and the grout material is discharged from the gap S. Thereafter, when the grout material overflows from the opening at the proximal end of the casing rod 6, the injection is stopped and the injection tube 8 may be removed. Note that the tip of the injection tube 8 does not necessarily reach the vicinity of the tip of the casing rod 6, and the grout material may be discharged from the injection tube 8 at an intermediate portion in the casing rod 6 depending on the construction situation. Further, the grout material may be directly injected from the base end side of the casing rod 6 without using the injection tube 8. Furthermore, you may use the swivel (not shown) which can switch supply of air or water, or supply of air and water, and supply of grout material.

  Next, as shown in FIG. 15, the blade block 2 is pushed and opened outwardly around the shaft support portion (the first block shaft hole 32 portion into which the shaft support pin 4 is inserted) (long side base portion). At least the casing rod 6 is pulled out by the length of 30a, and a core material 7 such as a lock bolt or a steel bar is inserted into the casing rod 6 as shown in FIG. The blade block 2 (or lid 3) of the hole bit is pushed open to the face side (forward) in the hole.

  Next, after confirming that the core material 7 is in contact with the bottom of the hole H, the casing rod 6 is pulled out of the hole H together with the hole bit. In this case, the blade block 2 (or lid 3) of the drill bit is in a state where it is pushed open, and the core member 7 is pulled out while remaining in the drill hole H. Then, as the grout material solidifies, the remaining core material 7 is firmly fixed in the ground as shown in FIG. In the above-described process, the grout material injection operation and the casing rod 6 extraction operation are separate processes. However, the grout material is not necessarily required to be separate processes. The casing rod 6 may be pulled out with the (or lid 3) being pushed open. Further, a core material 7 such as a lock bolt or a steel rod is inserted into the casing rod 6, and the blade block 2 (or the lid 3) of the drill bit is cut at the tip of the core material 7. You may perform the process of pushing open to the side (frontward) before injection | pouring of grout material. Furthermore, if a hollow bolt (not shown) having a hollow interior is used as the core material 7, the grout material can be injected from the hollow portion without using the injection tube 8.

  Although not shown, when the core material 7 is inserted into the casing rod 6 after the drilling operation is finished, an external force is applied by the core material 7, so that the blade blocks 2, 102, and 202 are attached to the temporary pins 5, 5. When using the method of removing the ring bit 1 from the outside using the blade block 2, the blade block 2, 102, 202 is left in the hole H as it is.

It is the longitudinal cross-sectional view and side view of a drill bit which mounted | wore with the blade body block of 1st Embodiment. It is a cross-sectional view of the drill bit. It is the top view and side view of a blade body block. It is a perspective view of the drill bit in 1st Embodiment. It is a perspective view which shows the state by which the blade block of the drill bit was pushed open. It is a perspective view of the blade block. It is the longitudinal cross-sectional view and side view of a drilling bit which mounted | wore with the blade block of 2nd Embodiment. It is a cross-sectional view of the drill bit. It is the top view and side view of a blade block of a 2nd embodiment. It is a perspective view of the blade body block of 2nd Embodiment. It is the longitudinal cross-sectional view and side view of a drill bit which mounted | wore with the blade block of 3rd Embodiment. It is a side view of the blade block of 3rd Embodiment. It is explanatory drawing for demonstrating a drilling operation | work. It is explanatory drawing for demonstrating injection | pouring operation | work of a grout material. It is explanatory drawing for demonstrating pushing open of a blade body block. It is explanatory drawing for demonstrating pushing open of a blade body block. It is explanatory drawing which shows the embedment state of a core material.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Ring bit, 2 ... Blade body block, 3 ... Cover body, 3a ... Notch (of cover body), 4 ... Shaft support pin, 5 ... Temporary pin, 5a ... Groove, 6 ... Casing rod, 7 ... Core material, 8 ... Injection tube, 10 ... Head, 11 ... Blade, 12 ... Valley, 13 ... Groove, 14 ... First notch, 15 ... Second notch, 16 ... First head shaft hole, 17 ... 2nd head axis hole, 20 ... base, 21 ... engaging part, 30 ... base part, 30a ... long side base part, 30b ... short side base part, 31 ... blade body, 32 ... 1st block axis Hole, 33 ... second block shaft hole, 40 ... set screw, 102 ... blade block, 103 ... lid body, 130 ... base portion, 131 ... blade, 132 ... first block shaft hole, 133 ... second Block shaft hole, 202 ... blade block, 230 ... base portion, 231 ... blade body, 232 ... first block shaft hole, 233 ... 2 of block shaft hole, H ... drilling, S ... gap.

Claims (8)

A drill bit to be attached to the tip of a casing rod in which a core material can be inserted,
The drill bit is provided with a ring bit in which a blade is planted in an annular shape and a gap in the inner periphery surrounded by the ring bit, and the blade is implanted in a substantially one letter shape or a cross shape. A blade block, and an engaging portion that engages with the casing rod,
The ring bit is partially cut away, and at least first and second cutout portions are formed,
The blade block has a configuration in which one end and the other end thereof are temporarily fixed to the first and second cutout portions of the ring bit by temporary pins, respectively.
A drilling bit characterized by that. A drill bit to be attached to the tip of a casing rod in which a core material can be inserted,
The drill bit is provided with a ring bit in which a blade is planted in an annular shape and a gap in the inner periphery surrounded by the ring bit, and the blade is implanted in a substantially one letter shape or a cross shape. A blade block, and an engaging portion that engages with the casing rod,
The ring bit is partially cut away, and at least first and second cutout portions are formed,
One end portion of the blade block is pivotally supported by the first notch portion of the ring bit, and the other end portion is temporarily fixed to the second notch portion of the ring bit by a temporary pin. It was supposed to be configured,
A drilling bit characterized by that.   The said blade body block is attached with the cover body which was formed with the board | plate material smaller diameter than the inner periphery of the said ring bit, and the clearance gap was formed between the said ring bits. The bit for drilling according to the item. The temporary fixing by the temporary pin is released by applying an external force to the blade block or the lid body, the core material inserted inside the casing rod,
4. The structure according to claim 1, wherein the blade block is released from the drill bit or is pushed open about the shaft support portion by the release, and the core member protrudes to the outside. 5. The drilling bit described.   The drill bit according to any one of claims 1 to 4, wherein the core member is formed of a lock bolt. A core material embedding method using the drill bit according to any one of claims 1 to 5,
A first step of drilling the ground to a desired depth by rotation or hammering or rotation and hammering applied to the casing rod in a state where the drilling bit is connected to the tip of the casing rod;
By inserting a core material into the casing rod and applying an external force with this core material, the blade block is removed from the drill bit, or the shaft support portion is pushed open to project the core material to the outside. A second step of pulling out the drill bit and the casing rod and leaving the core material in the drilled drill hole.
A core material embedding method characterized by this.   In the first step, air or water, or air and water is supplied into the casing rod, and the air or water, or the air and water is ejected from the gap of the drill bit, and the hole is drilled. The core material embedding method according to claim 6.   In the second step or between the first step and the second step, a grout material is supplied into the casing rod, and the grout material is discharged from the gap of the drill bit, The core material embedding method according to claim 6 or 7, wherein the core material is fixed in the ground by a grout material.

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