JP2002213173A - Method for burying reinforcing bar and the like, and drilling bit used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for burying a lock bolt, a reinforcing bar, etc., in ground and a drilling bit suited to be used for the method. SOLUTION: Drilling is performed while imparting rotation, percussion and thrust by coupling a pipe rod fitted with a bit to a rock drill by means of the pipe rod, whose thick part has a single structure, and the bit whose core part is provided with a through hole and whose end is provided with an openable/closable cover body for covering an opening of the through hole. The pipe rod is slightly pulled out on the termination of the drilling to a prescribed depth, the cover body for the bit is pushed open outside by the reinforcing bar, etc., inserted from outside into the pipe rod, the bit and the pipe rod are pulled out rearward along the reinforcing bar, etc., in a state wherein the reinforcing bar, etc., is protruded from the bit, and the reinforcing bar, etc., is made to remain within a hole, for the purpose of burying the reinforcing bar, etc., in the ground.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an embedding method for embedding rock bolts, reinforcing bars, and the like in the ground, and a drill bit suitable for use in the method.

[0002]

2. Description of the Related Art For example, when a lock bolt is buried in a slope, a bit is conventionally attached to the tip of a pipe rod having a double pipe structure, and the bit is perforated while being hit, rotated and thrust.

[0003]

However, the pipe rod having the double pipe structure is structurally complicated, has a low drilling speed, is expensive, and has difficulty in drilling a hole in a long pipe. There was a problem. Furthermore, when inserting a lock bolt or injecting cement milk, it is necessary to first pull out the inner pipe rod together with the bit from the drilled hole, then inject the lock bolt and cement milk, and then pull out the outer pipe rod And the work was complicated.

Accordingly, the present invention is an improvement of the above-described conventional drilling method, in which a relatively long pipe can be easily drilled with only an outer pipe rod, and a rod such as a lock bolt or a reinforcing bar (referred to as a "rebar"). It is an object of the present invention to provide a perforation method capable of easily performing insertion of cement milk and injection of cement milk, and a perforation bit used for the method.

[0005]

In order to solve the above problems, the present invention employs the following configuration. That is, the embedding method of a reinforcing bar or the like according to the present invention includes a pipe rod having a single-walled thick-walled portion, a through hole in the core portion, and an openable and closable lid that covers the opening of the through hole at the tip portion. Using the provided bit, connect the pipe rod with the bit attached to the rock drill, drill while applying rotation, impact, and thrust, and withdraw a little when the drilling of the predetermined depth is completed The cover of the bit is pushed outward by a reinforcing bar or the like inserted from the outside into the pipe rod, and the bit and the pipe rod are pulled backward along the reinforcing bar or the like with the reinforcing bar or the like protruding from the bit. And the reinforcing bars are left in the holes.

Specifically, when the drilling of a predetermined depth is completed, cement milk is injected into the pipe rod, a reinforcing rod or the like is inserted into the pipe rod to the tip of the bit, and the bit of the bit is inserted with the reinforcing rod or the like. Push the lid open to allow the reinforcing steel and the like and cement milk to remain in the perforated hole, and pull out the pipe rod and bit back along the remaining reinforcing steel and the like to securely fix the reinforcing steel and the like in the hole. I do.

Further, the drill bit according to the present invention is a drill bit attached to the distal end of a hollow pipe rod, and the core of the drill bit has a through hole having an opening at the distal end. It is characterized in that it is provided with a rotatable lid that is formed and that opens and closes the opening of the through hole.

According to the present invention, since a pipe having a single-wall thick portion is used as a pipe rod, a pipe rod having an optimum thickness can be used according to use conditions. Further, since the lid for opening and closing the opening is provided at the tip of the bit, it is possible to push open the lid of the bit with, for example, a reinforcing bar inserted into the pipe rod from outside the perforated hole. In addition, it is possible to easily insert a reinforcing bar or a lock bolt, or inject cement milk into a perforated hole.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention shown in the drawings will be specifically described. FIGS. 1 to 4 show a drill bit as a punch device of the present invention.
The drill bit (abbreviated as “bit”) 1 is composed of a main body 2 and a lid 3. As shown in the figure, a main body 2 of the bit 1 has a head 5 on which button-shaped hard blades (carbide tips) 4 are implanted, and a screw cylinder provided on the back side of the head 5. And a base 6 composed of On the outer peripheral portion of the base 6, a male screw 7 for mounting on a pipe rod is formed. A substantially ring-shaped cutting edge portion 10 is formed in the head portion 5 and grooves 11 for discharging dust (crushed debris) in the front-rear direction are provided at appropriate intervals on the outer peripheral surface. The hard blade body 4 is attached to the tip end surface of the blade tip portion 10, and a part of the circumference thereof is cut out at a predetermined width to form a lid attachment portion 12. In addition, the lid attaching portion 1
The shaft insertion holes 1 in the lateral direction are provided at both edges of the blade
3 are provided.

The inside of the ring-shaped cutting edge portion 10 of the main body 2 has a lid fitting hole 15 having a predetermined depth. Hole bottom 1
5a is the same surface as the surface 12a of the lid mounting portion 12, and hemispherical projections 17,... In addition, the central part of the main body is a through hole 20 that communicates back and forth.

The lid 3 is rotatably mounted on the lid mounting portion 12 by a horizontal shaft 25. The lid 3 is
As shown in FIG. 4, a ring-shaped cutting edge 10 of the main body 2 is provided.
Disc-shaped lid body 30 fitted in the lid fitting hole 15 inside the
And a base 31 integrated with the lid body, and a small-diameter discharge port 3 communicating with the front and back at the center at the front of the lid body 30.
2 are drilled, and the same hard blades 4,... On the back side of the lid main body 30, the recess 3 into which the projections 17,.
3,... Are formed. The base 31 of the lid 3 is provided with a shaft hole 31a, which is attached to the main body 2 by a shaft 25 inserted therein so as to be able to rotate back and forth. When the cover 3 is closed, that is, when the cover 3 is fitted into the fitting hole 15 of the main body 2, only the discharge port 32 at the center thereof communicates with the through hole 20 of the main body 2. In this state, the projections 17,... Of the main body 2 are fitted into the recesses 33,... Provided on the rear surface side of the lid main body, thereby preventing the lid 3 from being displaced.

The bit 1 is used by being attached to the tip of a pipe rod 40. As shown in FIG. 7, the pipe rod 40 is a so-called single pipe in which female threads 41 are formed at both ends, and the thick portion 42 has a simple structure instead of a double structure. The bit 1 is
The male screw 7 of the base 6 is connected to the female thread 4 of the pipe rod 40.
It can be easily attached by screwing it to 1.

The pipe rod 40 having the bit 1 attached to the tip is used by being attached to a known rock drill R mounted on, for example, a guide cell (not shown). In the example shown in FIG. 9, the pipe rod 40 is connected to a shank rod S of a rock drill via a swivel device 50. As shown in FIG. 5, the swivel device 50 has a cylindrical swivel body 51 rotatably fitted to a cylindrical swivel body 51. The swivel body 51 is provided with a fluid supply port 53, and has an inner surface side. An annular groove 54 to which the supply port 53 communicates.
Is provided. The swivel 52 has a plurality of openings 55 communicating with the inside and outside at positions facing the annular groove 54.
Are formed, and a male screw portion 56 which is screwed to the female screw portion 41 of the pipe rod 40 is provided at a tip portion. 5
7, ... are sealing materials. If this swivel device 50 is used, the fluid introduced from the supply port 53 can be supplied to the rotating pipe rod 40.

FIGS. 9 to 12 show a method of embedding a reinforcing bar T with a drilling machine having the above-mentioned bit 1 and a pipe rod 40. First, the pipe rod 40 to which the bit 1 is attached is rotated by a rock drill R. Then, a striking force and a thrust are given to pierce the embedding hole H having a predetermined depth. At the time of this perforation, compressed air is supplied into the pipe rod 40 through the swivel device 50, and the supplied compressed air is discharged forward from the discharge port 32 of the bit 1. The compressed air discharges the powder from the perforated hole H and cools the cutting edge of the bit.

When a hole H having a predetermined depth is drilled, the rock drill R is cut off from the pipe rod 40, and an injection pipe P for an injection material such as cement milk is piped from the outside as shown in FIG. It is inserted into the rod 40, and its tip reaches near the tip of the pipe rod 40. In this state, the injection material is injected into the pipe rod through the injection pipe P. When the injection material having the same concentration overflows from the opening at the base of the pipe rod 40, the injection is stopped and the injection pipe P is withdrawn.

Next, as shown in FIG. 10A, the pipe rod 40 is pulled out only slightly (10 to 15 cm).
As shown in FIG. 10B, a reinforcing rod or the like T is inserted into the pipe rod 40, and the lid 3 of the bit 1 is pushed outward (forward) at the tip of the reinforcing rod or the like. In addition, a spacer 70 as shown in FIG. The spacer 70 is for holding the reinforcing bar T in the center of the pipe rod and for preventing the reinforcing bar T or the like from being buried out of the pipe rod. Are attached. The blade 72 is made of an elastic material, and when expanded, the diameter of the circumference connecting the tips is substantially equal to the inner diameter of the hole H.
Within 0, the diameter is somewhat smaller on the inner wall of the pipe rod.

As shown in FIG. 11 (a), the pipe rod 40 is pulled out of the hole H together with the bit 1 after confirming that the reinforcing bar T contacts the bottom of the hole H. In this case, the cover 3 of the bit remains open, and a reinforcing rod T or the like is loosely fitted in the through hole 20 of the bit 1. When passing through the spacer 70, the elastic blade 72, which is open backward, is narrowed, passes through the through hole 20 of the bit 1, and then expands again.

FIG. 12 shows a state in which the embedding of the reinforcing bar T is completed. The reinforcing bar T is held in the center of the hole H formed by the action of the spacer 70, and the filling material (cement milk, etc.) Is solidified, the buried reinforcing bars T and the like are firmly fixed in the ground.

When the ground is clayey soil or sand, spiral wings 44 as shown in FIG.
May be used as the hollow spiral rod 45 provided on the outer periphery. The hollow spiral rod 45 has a spiral blade 44 provided on an outer peripheral portion of the pipe rod 40.
The slime is forcibly sent in the direction of the hole by the spiral blades 44 by the rotation of the spiral rod 45 and is discharged.

FIG. 13 shows the bit 1 and the pipe rod 4.
In this example, a perforation device provided with 0 is used for a different purpose from the above, and in this example, it is used for perforation underwater. That is, a drilling machine D such as a crawler drill is mounted on a ship F floating and fixed on the surface of the sea, lake, river, or the like,
The pipe rod 40 is connected to the rock drill R attached to the guide cell G, and drilled on the sea floor (lake bottom, river bottom) or the like. In this case, since compressed air is inserted into the inside of the pipe rod through the swivel device 50, during the drilling, the pipe rod 40 is inserted.
No water enters. For this reason, embedding of a reinforcing bar or the like, blasting in water, crushing in water with a static crushing agent, and the like can be performed well by the same method as described above.

Since the pipe rod used in this drilling device has a single structure, the thickness of the pipe rod can be increased, and a deep hole can be drilled using a long pipe. As a rock drill, either a pneumatic rock drill or a hydraulic rock drill can be used. Further, a rod material such as a lock bolt or a reinforcing bar can be easily inserted into the perforated hole. Moreover, depending on the case, it is also possible to simultaneously pierce while pouring water or cement milk.

FIG. 14 shows an embodiment different from the above embodiment.
A head 105 having hard blades 4,... Implanted thereon is provided at the tip of the main body 102 in the same manner as in the above-described embodiment, and a threaded base 106 is integrally formed on the back side thereof. Is provided. The lid 103 has a shaft 125 similarly to the above-described embodiment.
The cover 10
The base 3 is constantly urged in the opening direction by a spring 130 whose base is supported inside the main body. A rod 131 is inserted into the spring 130, and the tip of the rod 131 is connected to a pin 132 fixed to the lid 103. During drilling, the rod 131 is pulled backward and fixed by the wire 150 whose end is fixed to the base of the pipe rod 140 so that the lid 103 pressed by the spring is not opened. When the piercing is completed, the lid 103 can be opened by the elastic force of the spring 130 by loosening the wire. Other parts have substantially the same structure as in the above embodiment. As described above, an appropriate method can be used for opening and closing the lid in the drill bit having the openable lid.

FIGS. 15 to 18 show a drill bit according to still another embodiment.
Is composed of a main body 202 and a lid 203. The bit body 202 includes a head 205 on which the hard blades 4 are implanted, and a base 206 provided on the back side of the head 205. A male screw 207 for mounting to a pipe rod is provided on an outer peripheral portion of the base portion 206.

The head 205 has a substantially ring-shaped cutting edge 2.
10 are formed, and in the outer peripheral portion thereof, there are provided powdery grooves 211,... And discharge ports (water holes) 232,. A part of the circumference of the cutting edge is cut off at a predetermined width to form a lid mounting portion 212. Lid attachment part 212
Are provided on both sides with a lateral shaft insertion hole 213 for rotatably mounting the lid 202.

A lid fitting hole 215 having a predetermined depth is provided inside the ring-shaped cutting edge portion 210 of the bit body 202. Further, on the outer peripheral portion of the lid fitting hole 215,
A relatively shallow groove 216 communicating with the outer peripheral portion of the bit body is provided at a position diametrically opposed to the lid attaching portion 212. The inner peripheral surfaces of the lid fitting hole 215 and the groove 216 are inclined surfaces that open outward (toward the tip of the bit) such that the opening side is wide and the bottom side is narrow. Further, a through hole 220 is provided at the center of the bit body to communicate back and forth.

The cover 203 is rotatably mounted on the cover mounting portion 212 by a horizontal shaft 225.
A coil spring 224 is provided around the shaft 225 for urging the cover 203 to always close.
The lid 203 includes a disc-shaped lid main body 230 fitted into the lid fitting hole 215, a base 231 integral with the lid main body, and a protruding portion integrally provided at a position diametrically opposed to the base. 235 and the hard blade body 4,
Are formed, and a groove-shaped concave portion 238 is formed on the back surface from the lid main body 203 to the protruding portion. Projection 235
Is projected outward from the outer peripheral portion of the lid main body 230, and in the illustrated example, only one is provided on the side opposite to the base portion, but it may be provided at another position or a plurality may be provided. .
The outer peripheral surfaces of the lid body 231 and the protruding portion 235 are
The front surface is formed as an inclined surface which is wide and the back surface is narrow, and is adapted to the inclined surface of the lid fitting hole 215 and the groove 216. The state in which the lid 203 is closed,
In a state where the lid 203 is fitted into the second fitting hole 215,
The protrusion 235 fits into the groove 216 and regulates a lateral displacement.

The drill bit 200 is provided with a protruding portion 235 protruding in the radial direction on the outer peripheral portion of the lid 203, and this protruding portion fits into the groove 216 of the bit head in the closed state. The lid 203 is firmly held on the cover, and no displacement occurs even when a torque or a lateral force acts on the lid. Also, the outer peripheral surface of the lid 203 is formed as an inclined surface having a wide front surface and a narrow rear surface, including the protruding portion 235, and the inner peripheral surface of the lid fitting hole 215 or the groove 216 in which the lid fits. Since it is formed as an inclined surface compatible with this, there is no positional deviation when the lid is opened and closed, and the opening and closing operation can be easily performed. Further, as shown in the drawing, if the concave portion is formed by notching the rear surface of the lid 203, the space on the bit center side in the open state where the lid 203 stands up in the axial direction is widened. There is an advantage that it does not interfere with insertion.

The method of using the drill bit 200 is substantially the same as in the above embodiment. However, in this embodiment, since the lid 203 is constantly urged in the closing direction by the spring 224, it is necessary to push open the lid from the inside with a reinforcing bar or the like when the perforation is completed. In this case, since the cover 203 is fitted in the cover fitting hole on the inclined surface, it can be easily pushed open.

[0029]

As described above, the method of embedding a reinforcing bar or the like according to the present invention uses a hollow pipe rod and a bit having an openable / closable lid, so that a hole for embedding is drilled and the hole is drilled into the drilled hole. It becomes possible to bury the reinforcing bars and to inject the injection material very easily. Furthermore, the drilling method is more economical than the conventional drilling method using a double pipe, the drilling speed can be improved, and the shortening of the construction period can be expected.
In addition, this device can be used for a wide range of applications involving drilling work in addition to underwater blasting.

[Brief description of the drawings]

FIG. 1 is a front view (a), a side view (b), and a plan view (c) of a bit.

FIG. 2 is an assembly view of a bit.

FIG. 3 is a perspective view (a), a front view (b), a plan view (c), and a side view (d) of a bit main body.

FIG. 4 is a perspective view (a), a front view (b), a side view (c), a plan view (d), a back perspective view (e), and a back view (f) of the lid.

FIG. 5 is a perspective view (a) and a side view (b) of the swivel device.

FIG. 6 is a front view (a), a side view (b), and a perspective view (c) of a spacer.

FIG. 7 is a partial sectional view of a pipe rod.

FIG. 8 is a side view (a) and a perspective view (b) of a hollow spiral rod.

FIG. 9 is an explanatory view of a drilling method and a burying method.

FIG. 10 is an explanatory view of a drilling method and a burying method.

FIG. 11 is an explanatory view of a drilling method and a burying method.

FIG. 12 is an explanatory diagram of a drilling method and a burying method.

FIG. 13 is an explanatory view (a) of a usage different from the above and an enlarged view (b) of a main part.

FIG. 14 is a sectional view showing a bit different from the above.

FIG. 15 is a front view of a bit in still another embodiment.

FIG. 16 is a side view thereof.

FIG. 17 is a longitudinal sectional view thereof.

FIG. 18 is a view of the lid viewed from an arrow A.

[Explanation of symbols]

 1 bit 2 bit body 3 lid 4 hard blade 40 pipe rod 50 swivel device 100 bit 102 bit body 103 lid 200 bit 202 bit body 203 lid

Continued on the front page (71) Applicant 390036504 Nittoku Construction Co., Ltd. 8-14-14 Ginza, Chuo-ku, Tokyo (71) Applicant 000104191 Kanatsu Giken Kogyo Co., Ltd. 636 Kasugacho, Matsue-shi, Shimane (72) Invention Person Hiromi Kawakami 36 Tojo-cho, Tojo-cho, Hiba-gun, Hiroshima Prefecture Inside Yamamoto Rock Machine Co., Ltd. (72) Inventor Wataru Imaoka 36 Tojo-cho, Tojo-cho, Hiroshima Pref. Matsue City Gakuen 2-18-26 Co., Ltd.Muramatsu Matsu Civil Engineering Co., Ltd. (72) Inventor Hideyasu Matsuzawa 3-16 Tsurumicho, Naka-ku, Hiroshima-shi, Hiroshima Pref. Kumagaya Gumi Hiroshima Branch (72) Inventor Kuni Kihara Katsu 1-2-1, Otemachi, Naka-ku, Hiroshima-shi, Hiroshima Pref. Nitto Construction Co., Ltd. Hiroshima Branch (72) Inventor Ryoji Nagata 636 Kasugacho, Matsue-shi, Shimane Prefecture Kanatsu Giken Kogyo Co., Ltd. F-term (reference) 2D029 EC00

Claims (10)

[Claims] 1. A pipe rod having a single-wall thick portion and a bit provided with a through hole in a core portion and a tip end provided with an openable and closable lid for covering an opening of the through hole. Connect the pipe rod with the bit attached to the rock drill, rotate,
While drilling while applying a blow and thrust, when the drilling of a predetermined depth is completed, the drill is pulled out a little, and the cover of the bit is pushed outward by a reinforcing rod or the like inserted from the outside into the pipe rod to open the bit. The projecting bit is pulled out of the bit, the bit and the pipe rod are pulled rearward along the reinforcing bar or the like, and the reinforcing bar or the like remains in the hole. 2. When the drilling of a predetermined depth is completed, cement milk is poured into the pipe rod, a reinforcing bar or the like is inserted into the pipe rod up to the tip of the bit, and the cover of the bit is inserted with the reinforcing bar or the like. 2. The method of burying a reinforcing bar according to claim 1, wherein the reinforcing bar or the like and the cement milk are left in the perforated hole by pushing open, and the pipe rod and the bit are pulled backward along the remaining reinforcing bar or the like. 3. The method of embedding a reinforcing bar or the like according to claim 1, wherein a swivel device is attached to a base portion of the pipe rod, and a fluid such as air, water, cement milk or the like is supplied into the pipe rod via the swivel device. . 4. The method of embedding a reinforcing bar or the like according to claim 1, wherein a pipe rod having a spiral wing provided on an outer peripheral portion is used as the pipe rod. 5. A drill bit attached to a distal end of a hollow pipe rod, a hard blade is implanted at the distal end of the drill bit, and a core has an opening at the distal end. A drill bit characterized by being provided with a through hole and being provided with a rotary lid for opening and closing the opening of the through hole. 6. A lid fitting hole in which a lid is fitted at the tip of the drill bit, and the lid in a closed state is fitted in the fitting hole. 2. A drill bit according to claim 1. 7. An outer peripheral portion of the lid is provided with a protruding portion protruding outward, and a head portion of the bit body is provided with a concave portion into which the protruding portion is fitted when the lid is closed. The drilling bit according to claim 5 or 6, wherein: 8. The drill bit according to claim 5, wherein a spring for urging the lid in a closing direction is provided at a base of the lid. 9. An outer peripheral surface of the lid is formed as an inclined surface having a wide front surface and a narrow rear surface, and a peripheral wall surface of a lid fitting hole of the bit body is formed as an inclined surface corresponding to the inclined surface of the lid. The drill bit according to any one of claims 6 to 8, wherein: 10. A groove-like concave portion is provided on the back side of the lid so as to increase the space on the center side of the bit body when the lid is open. Drilling bits.