JP4264396B2 - Drilling device - Google Patents

Description

  The present invention relates to a drilling device, and more particularly to a drilling device having an improved structure for pulling out a connecting pin that connects a drive shoe and a base end portion of a drilling bit.

  As a hole drilling device, for example, a device (a drilling device) described in Japanese Patent No. 2759437 is known. FIG. 6 is an explanatory view for explaining a conventional drilling device (drilling device). This drilling device includes a hollow cylindrical casing 2, a hollow cylindrical drive shoe 4 connected to the front end of the casing 2 in the drilling direction, and a hollow cylindrical base end portion 5b in the drilling direction of the drive shoe 4. In a drilling device including a bit (also referred to as a kronen bit) 5 loosely fitted to the front end, the locking portion 3 provided on the drive shoe 4 and the locking at the base end portion 5b of the bit 5 The through hole 6 provided at a position corresponding to the portion 3 and the through hole 6 from the inside of the base end portion 5b of the bit 5 are detachably fitted to the locking portion 3, and the bit 5 is connected to the drive shoe. 4, a connecting pin (locking pin) 13 that is not relatively rotatable along the circumferential direction and is not relatively movable along the drilling direction, and is detachably fitted inside the base end portion 5 b of the bit 5. And the connecting pin 13 is engaged with the locking portion 3 A hollow cylindrical pin presser member 26 that is held in a state of being held between the connecting pin 13 and the base end portion 5b of the bit 5 and constantly biasing the connecting pin 13 in the direction of disengagement from the engaging portion 3. The urging member 27 and the pin retaining member 26 are separated from the inside of the base end portion 5b of the bit 5 and recovered in association with the forward and backward movement along the piercing direction and the direction opposite to the piercing direction. And a recovery member (not shown) that separates from the locking portion 3 by the urging force of the urging member 27.

  According to this drilling device, after completion of drilling (FIG. 6 (a)), a recovery member (not shown) is inserted into the casing 2, connected to the pin presser member 26, and then pulled up to pull the casing 2 and the bit. 5 can be released, and the pin pressing member 26 can be recovered on the ground. Next, as shown in FIGS. 6B and 6C, an uncurtain dong (which may be a steel pipe or the like) 28 is inserted into the casing, the bit 5 is left in the hole (disposable), and only the casing 2 is recovered. It is like that.

Japanese Patent No. 2759437

  However, in the hole drilling device, even if the pin holding member 26 is recovered, the connecting pin 13 remains on the base end portion 5b of the bit 5, so that the connecting pin 13 is detached from the locking portion 3 as a result. It was difficult to check whether or not. If the connecting pin 13 is not detached from the locking portion 3, the operation of inserting the uncurtain dong 28 into the casing 2 and collecting the casing 2 cannot be performed. For this reason, it is necessary to cut the connecting pin 13 to separate the bit 5 from the drive shoe 4. Further, in the conventional drilling device, the connecting pin is disposed with the bit in the hole (underground), and the connecting pin cannot be recovered or reused.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a hole drilling device that can easily confirm whether or not a connecting pin is detached from a locking portion. That is, the present invention integrates the connecting pin and the pin pressing member as a connecting jig, and makes it possible to easily check whether the connecting pin is detached from the locking portion by collecting the connecting jig, and includes the connecting pin. The connecting jig can be used repeatedly.

  Among the present inventions, the invention according to claim 1 is a hollow cylindrical casing, a hollow cylindrical drive shoe connected to the front end of the casing and having a locking portion on the inner surface, and loosely fitted inside the drive shoe. A drill bit having a hollow cylindrical base end portion and a through hole in a portion corresponding to the locking portion in the base end portion, and opening and closing with the rear side as a fulcrum in the base end portion of the drill bit The opening / closing piece has an opening / closing piece on which the possible front side is located, and the opening / closing piece is provided with an urging member for urging in the opening direction. A connection jig provided with a connection pin for connecting the drill bit and the drive shoe by releasably engaging with the locking portion, and a releasably fitted fitting from the rear side of the connection jig. Close and release the connecting pin from the locking part and through hole and keep the open / close piece closed. Characterized in that a recovery tool to recover the connecting jig on the ground with.

  The invention of claim 2 includes a hollow cylindrical casing, a hollow cylindrical drive shoe connected to the front end of the casing and having a locking portion on the inner surface thereof, and a hollow cylindrical shape loosely fitted inside the drive shoe. A drilling bit having a base end portion, a through hole formed in a portion corresponding to the locking portion in the base end portion, and the whole including the base end portion loosely fitted in the drive shoe; The base of the drill bit has an opening / closing piece positioned on the front side that can be opened / closed with the rear side as a fulcrum, and the opening / closing piece is provided with a biasing member for biasing in the opening direction. A connecting jig provided on the front side of the piece with a connecting pin that passes through the through hole and engages and disengages with the locking portion to connect the drill bit and the drive shoe, and the connection jig. Fits detachably from the rear side of the tool, closes the open / close piece and removes the connecting pin from the locking part And a recovery jig for recovering the connection jig and the drill bit to the ground side while holding the open / close piece closed so that the connection pin remains engaged with the through hole. And

  According to the first aspect of the present invention, a hollow cylindrical casing, a hollow cylindrical drive shoe connected to the front end of the casing and having a locking portion on the inner surface, and a hollow loosely fitted inside the drive shoe A drilling bit having a cylindrical base end portion and having a through hole in a portion corresponding to the locking portion in the base end portion, and can be opened and closed with the rear side as a fulcrum in the base end portion of the drill bit. The opening / closing piece has an opening / closing piece positioned on the front side, and the opening / closing piece is provided with an urging member for urging in the opening direction. A connecting jig provided with a connecting pin for connecting the drill bit and the drive shoe so as to be detachably engaged with the part, and detachably fitted from the rear side of the connecting jig and closing the opening and closing piece The connecting pin is removed from the locking part and the through hole, and the open / close piece is held closed. Because and a recovery tool for recovering connecting jig on the ground, can be connecting pin when recovered connecting jig to easily confirm whether disengaged from the locking portion.

  According to the invention of claim 2, a hollow cylindrical casing, a hollow cylindrical drive shoe connected to the front end of the casing and having a locking portion on the inner surface, and a hollow loosely fitted inside the drive shoe A drilling bit having a cylindrical base end portion, a through hole formed in a portion corresponding to the locking portion in the base end portion, and the whole including the base end portion loosely fitted in the drive shoe And an opening / closing piece positioned on the front end side that can be opened / closed with the rear side as a fulcrum in the base end portion of the drill bit, and the opening / closing piece is provided with a biasing member for biasing in the opening direction. In addition, a connecting jig provided with a connecting pin that connects the drilling bit and the drive shoe on the front side of the opening and closing piece through the through hole and detachably engaged with the locking portion, It is detachably fitted from the rear side of the connection jig, closes the open / close piece, and locks the connection pin. And a recovery jig for recovering the connection jig and the drill bit to the ground side while holding the open / close piece closed so that the connection pin remains engaged with the through hole. Therefore, it is possible to easily check whether or not the connecting pin is detached from the locking portion when the connecting jig is recovered, and the bit can also be recovered.

  The best mode for carrying out the present invention will be described below in detail with reference to the accompanying drawings. 1A and 1B are diagrams showing an example of a drilling device according to a first embodiment of the present invention, in which FIG. 1A is a sectional view before fitting a recovery jig, FIG. 1B is a sectional view when fitting a recovery jig, FIG. 2 is a schematic side view of the connecting jig, and FIG. 3 is a schematic enlarged front view of the connecting jig.

  In these drawings, 1 is a hole drilling device, which is connected to a hollow cylindrical casing (also referred to as a hole drilling tube) 2 and a front end of the casing 2, and has a locking portion (for example, A hollow cylindrical drive chassis-4 having a hole or recess) 3 and a hollow cylindrical base end portion 5b loosely fitted inside the drive shoe 4, and the locking at the base end portion 5b A through hole 6 is formed in a portion corresponding to the portion 3, and a drill bit 5 that rotates integrally with the drive shoe 4 to excavate the ground is provided. The drill bit 5 includes a main body portion 5a at the distal end and a hollow cylindrical base end portion 5b provided at the rear portion of the main body portion 5a. In the drill bit 5 of the present embodiment, the main body 5 a is larger than the inner diameter of the casing 2, and the base end 5 b is formed to be the same as or slightly smaller than the inner diameter of the casing 2. The main body 5a is provided with a water supply hole 7 for supplying water (slime-treated water) guided through the casing 2 toward the excavation ground. It is designed to be transported to the ground along the outer surface.

  The casing 2 has a rear end (not shown) connected to a drifter, which is a rotary drive mechanism of a rotary drill machine, for example, a work machine, via a swivel for supplying high-pressure slime-treated water. The ground is drilled by pushing vertically while rotating around the axis. The casing 2 is used by being screwed and connected in series as appropriate according to the depth (length) of the drilling holes.

  In the base end portion 5 b of the drill bit 5, a front side of a connecting jig 8 for connecting the drill bit 5 and the drive shoe 4 integrally is disposed. The connecting jig 8 has a pair of opening and closing pieces 9 and 9 in the illustrated example in which the front side can be opened and closed with the rear side as a fulcrum. The opening / closing pieces 9 and 9 are connected to the rear side via a bearing 10 and a support shaft 11 so as to be rotatable. It is preferable that the front side of the opening and closing pieces 9 and 9 is formed in a circular arc shape along the inner periphery of the base end portion 5 b of the drill bit 5. A compression spring 12, which is an urging member (first urging member) for urging the front side of the opening / closing pieces 9, 9 in the opening direction, is interposed between the opening / closing pieces 9, 9. The open / close pieces 9 and 9 are regulated so that the rear ends thereof come into contact with each other against the spring force (biasing force) of the compression spring 12 so that the opening between the front and rear ends has a predetermined opening degree.

  On the front side of the opening and closing pieces 9, 9, the through hole 6 passes through the through hole 6 and engages and disengages with the locking portion 3 so as to integrally connect the drill bit 5 and the drive shoe 4. A connecting pin 13 is provided. The two engaging portions 3 are provided symmetrically on the inner surface of the drive shoe 4 at equal intervals, for example, at 180 ° C. in the circumferential direction. Corresponding to these locking portions 3, through holes 6 are provided symmetrically at equal intervals in the circumferential direction in the base end portion 5 b of the drill bit 5, and the opening and closing pieces 9 of the opening and closing pieces 9 are corresponding to these through holes 6. A connecting pin 13 projects from the outer surface on the distal end side. The connecting pin 13 may be fixed to the front end side of the opening / closing piece 9 by welding, but may be detachably (replaceable) by screwing.

  The connecting jig 8 can be collected on the ground side by a collecting jig 14 inserted into the casing 2 from the ground side and detachably fitted from the rear end side. The collecting jig 14 is fitted to the connecting jig 8 from the rear end side to close the open / close pieces 9 and 9 so that the connecting pin 13 is disengaged (pulled out) from the locking portion 3 and the through-hole 6. The pieces 9, 9 are held closed. The recovery jig 14 is formed in a hollow cylindrical shape that is smaller than the inner diameter of the casing 2, an inward flange-like locking receiving portion 15 is provided at the front end portion, and a connecting member 16 is interposed at the rear end portion. For example, a suspension member 17 made of a PC steel wire or a steel pipe is connected.

  The opening / closing pieces 9, 9 of the connecting jig 8 are provided with locking members 18 that are locked to the locking receiving portions 15 of the recovery jig 14 and hold the opening / closing pieces 9, 9 in a closed state. It has been. The locking member 18 may project from the outer surface of the opening / closing piece 9, but one end is pivotally supported on the inner surface of the opening / closing piece 9 via a bearing 19 and a support shaft 20 as illustrated. Further, it may be provided so as to be able to protrude and retract outward from a slit 21 formed in the opening / closing piece 9 by a spring 22 which is a biasing member (second biasing member).

  Next, the operation of the drilling device 1 having the above configuration will be described. The casing 2 having the drill bit 5 at the tip via the drive shoe 4 is connected to the base end (rear end) via a swivel to a drifter that is a rotary drive mechanism of a rotary drill machine, for example, a working machine. For example, the ground is drilled by pushing the casing 2 upright with respect to the ground while being rotated around the axis. At this time, in the connecting jig 8, the opening / closing pieces 9 and 9 are expanded (expanded), and the connecting pin 13 passes through the through hole 6 of the base end portion 5 b of the drill bit 5 to engage the locking portion of the drive shoe 4. 3 is engaged (fitted) and locked. Therefore, the drill bit 5 can rotate integrally with the drive shoe 4 without making relative rotation in the circumferential direction and relative movement in the axial direction with respect to the drive shoe 4, and can drill the ground.

  When the drilling is completed, the recovery jig 14 is inserted into the casing 2 from the ground, and the front end of the recovery jig 14 is fitted from the rear side of the connecting jig 8 by its own weight or by pushing. At this time, the opening / closing pieces 9 and 9 are closed (reduced in diameter) by the recovery jig 14, whereby the connection pin 13 of the connection jig 8 is detached from the locking portion 3 and the through hole 6. Further, when the locking receiving portion 15 of the recovery jig 14 gets over the locking member 18, the recovery jig 14 can be locked to the locking member 18. Next, when the collecting jig 14 is pulled up via the suspension member 17, the locking receiving portion 15 is locked to the locking member 18, the connecting jig 8 is pulled up together with the collecting jig 14, and the connecting jig 8 is It can be recovered to the ground. At this time, since the connection pin 13 is provided in the connection jig 8, it can be easily confirmed that the connection pin 13 is detached from the locking portion 3 when the connection jig 8 is recovered.

  According to the drilling device 1 having the above configuration, a hollow cylindrical casing 2, a hollow cylindrical drive shoe 4 connected to the front end of the casing 2 and having a locking portion 3 on the inner surface, and the drive shoe 4 A drill bit 5 having a hollow cylindrical base end 5b loosely fitted therein, and having a through hole 6 in a portion corresponding to the locking portion 3 in the base end 5b, and the drill bit 5 has open / close pieces 9 and 9 positioned on the front side that can be opened and closed with the rear side as a fulcrum, and the open / close pieces 9 and 9 are biased in the opening direction, for example, a compression member A spring 12 is provided, and on the front side of the opening and closing pieces 9, 9, the through hole 6 is passed through and the engagement portion 3 is detachably engaged with the drill bit 5 and the drive shoe 4. The connecting jig 8 provided with a connecting pin 13 for connecting the two and the fitting jig 8 is detachably fitted from the rear side of the connecting jig 8. The recovery jig recovers the connecting jig 8 to the ground side by closing the opening and closing pieces 9 and 9 to disengage the connecting pin 13 from the locking portion 3 and the through-hole 6 and holding the opening and closing pieces 9 and 9 closed. Since the tool 14 is provided, it can be easily confirmed whether or not the connecting pin 13 is detached from the locking portion 3 when the connecting jig 8 is recovered.

  That is, according to the drilling device of the present embodiment, the connecting pin and the pin pressing member in the conventional drilling device are integrated as the connecting jig 8, so that the connecting pin 13 is locked by collecting the connecting jig 8. It is possible to easily confirm whether or not the part 3 is detached, and the connection jig 8 including the connection pin 13 can be used repeatedly. If the connecting pin 13 is not attached or damaged when the connecting jig 8 is collected, it is suspected that the connecting pin remains in the locking portion.

  FIG. 4 is a view showing a partial modification of the hole drilling device. As shown in FIG. 4, in order to transmit the rotational force from the drive shoe 4 to the drill bit 5 as shown in FIG. 4, the projecting portion 23 is provided at a predetermined position on the outer periphery of the base end portion 5b of the drill bit 5; An engagement recess 24 that engages with the protrusion 23 may be provided at a position corresponding to the protrusion 23 in the drive shoe 4. According to this, since the rotational force can be transmitted from the drive shoe 4 to the drill bit 5 via the protrusion 23 and the engagement recess 24, the shearing force applied to the connection pin 13 can be reduced. Durability can be improved.

  FIGS. 5A and 5B are diagrams showing an example of a drilling device according to a second embodiment of the present invention. FIG. 5A is a cross-sectional view before fitting a recovery jig, and FIG. 5B is a cross-sectional view when the recovery jig is fitted. is there. In the present embodiment, the same parts as those of the above embodiment are denoted by the same reference numerals and description thereof is omitted. In the present embodiment, an auxiliary bit 25 for excavating the ground is provided at the tip of the drive shoe 4, and the entire drill bit 5 including the base end portion 5 b has an inner diameter that is the same as or slightly smaller than the inner diameter of the casing 2. Therefore, the drill bit 5 can be collected through the casing 2.

  On the other hand, the recovery jig 14 is detachably fitted from the rear side of the connection jig 8 and closes (opens and closes) the opening and closing pieces 9, 9 to release the connection pin 13 from the locking portion 3. The connecting jig 8 and the drill bit 5 can be recovered to the ground side by holding the open / close pieces 9 and 9 closed so that 13 remains engaged with the through hole 6. .

  According to the drilling device 1 of the present embodiment, when the drilling is completed, the recovery jig 14 is inserted into the casing 2 from the ground, and the leading end of the recovery jig 14 is moved from the rear side of the connecting jig 8 by its own weight. Mating. At this time, the opening and closing pieces 9 and 9 are closed (reduced in diameter) by the recovery jig 14, whereby the connection pin 13 of the connection jig 8 is detached from the locking portion 3 (not removed from the through hole 6). . Further, when the locking receiving portion 15 of the recovery jig 14 gets over the locking member 18, the recovery jig 14 can be locked to the locking member 18. Next, when the collecting jig 14 is pulled up, the locking receiving portion 15 is locked to the locking member 18, the connecting jig 8 is pulled up together with the collecting jig 14, and the drill bit 5 is combined with the connecting jig 8. The connecting jig 8 and the drill bit 5 can be recovered to the ground by being pulled up. At this time, since the connecting jig 8 is provided with the connecting pin 13, it is easy to determine whether or not the connecting pin 8 is detached from the locking portion 3 when the connecting jig 8 is recovered. Can be confirmed.

  As mentioned above, although embodiment thru | or example of this invention has been explained in full detail with drawing, this invention is not limited to the said embodiment thru | or example, Various in the range which does not deviate from the summary of this invention. Design changes can be made. In the above embodiment, the case where there are two connection pins 13 is illustrated, but the number of connection pins 13 may be three or more. For example, when there are three connection pins, a connection jig having three opening and closing pieces. Is used.

It is a figure which shows an example of the drilling apparatus which is 1st Embodiment of this invention, (a) is sectional drawing before collection | recovery jig fitting, (b) is sectional drawing at the time of collection jig fitting. It is a schematic side view of a connection jig. It is a schematic enlarged front view of the connecting jig. It is a figure which shows the partial modification of a hole drilling apparatus. It is a figure which shows an example of the drilling apparatus which is 2nd Embodiment of this invention, (a) is sectional drawing before collection | recovery jig fitting, (b) is sectional drawing at the time of collection jig fitting. It is explanatory drawing explaining the conventional drilling apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drilling device 2 Casing 3 Locking part 4 Drive shoe 5 Drilling bit 5b Base end part of drilling bit 6 Through hole 8 Connecting jig 9 Opening and closing piece 12 Compression spring (biasing member)
13 Connecting pin 14 Recovery jig

Claims (2)

  A hollow cylindrical casing, a hollow cylindrical drive shoe connected to the front end of the casing and having a locking portion on the inner surface, and a hollow cylindrical base end portion loosely fitted inside the drive shoe, A drill bit having a through hole in a portion corresponding to the locking portion in the base end portion, and an opening / closing piece in which the front side that can be opened and closed with the rear side as a fulcrum is located in the base end portion of the drill bit. The opening / closing piece is provided with an urging member for urging in the opening direction, and the opening / closing piece is engaged with the engaging portion in a detachable manner through the through hole through the front side. A connecting jig provided with a connecting pin for connecting the drill bit and the drive shoe, and a releasably fitted fitting from the rear side of the connecting jig, closing the opening and closing piece, and connecting the connecting pin from the locking part and the through hole. Remove the connection jig while holding the open / close piece closed and collect the connection jig to the ground side. Drilling apparatus being characterized in that a OsamuOsamugu.   A hollow cylindrical casing, a hollow cylindrical drive shoe connected to the front end of the casing and having a locking portion on the inner surface, and a hollow cylindrical base end portion loosely fitted inside the drive shoe, A drilling bit in which a through hole is formed in a portion of the base end portion corresponding to the locking portion, and the whole including the base end portion is loosely fitted in the drive shoe, and a base end portion of the drilling bit The opening / closing piece has an opening / closing piece positioned on the front side which can be opened and closed with the rear side as a fulcrum, and the opening / closing piece is provided with an urging member for urging in the opening direction. A connecting jig provided with a connecting pin that connects the drilling bit and the drive shoe by detachably engaging with the engaging portion through the through hole, and removable from the rear side of the connecting jig Is closed and the open / close piece is closed to disengage the connecting pin from the locking part and connect A drilling hole comprising: a connecting jig and a recovery jig for recovering the drilling bit to the ground side while holding the open / close piece closed so that the pin remains engaged with the through hole apparatus.

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