JPS5847893A - Drill - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] This invention is a drilling device (poling device) used for digging deep wells for extracting oil, groundwater, etc., collecting geological samples to explore underground, or for civil engineering work. Regarding this, in particular, a bit holder with a pit attached thereto is fed into the underground end of the drill pipe using pressurized water.1. The bit holder is locked to the underground end of the drill pipe with a locking device, and the drill pipe is rotated to push the bit holder into the ground while rotating, and the bit and hole expansion cutter provided in the bit holder are removed. The present invention relates to a drilling device that is capable of drilling a hole in the ground with an inner diameter larger than the outer diameter of a drill pipe, or at the same time as drilling, penetrating and collecting geological heather into a core provided in a bit holding part.

In this type of drilling equipment, water is sent into the drill pipe, passed through the bit holder, and supplied to the vicinity of the bit and hole-expanding cutter to cool the bit and cutter and remove chips cut by the bit and cutter. is discharged to the ground along with water through the outside of the drill pipe. In order to effectively supply water near the cutting edge of the bit and cutter, the space between the pit holder and the drill pipe is designed so that water is supplied from inside the drill pipe to the bit through the bit holder. In order to prevent water from passing through the lower end, conventionally an annular rubber backing is applied to the outer periphery of the bit holding part, and the rubber backing is pressed into contact with an annular step provided on the inner surface of the drill pipe.

For this reason, when the bit holder is pulled up to the surface of the earth through the drill pipe, the water filling the drill pipe places a large load on the rubber backing, making it difficult to pull it up.

According to the present invention, the bit holder can be easily pulled up from the bottom end of the drill pipe, and at the locked position, water can be reliably blocked from passing between the bit holder and the drill pipe. The locking piece to prevent it from being pulled out from the bottom end also serves as a part of the water stop ring, making the structure simpler than before, and a patent claim was filed to achieve this purpose. This type of drilling device is equipped with the structure described in the above scope.

An embodiment of the present invention shown in the figures will be described.

The upper half of FIG. 1 shows when the bit holder is locked with respect to the drill pipe, and the lower half shows when the bit holder is unlocked.

l is a drill pipe, C is an outer pipe, 3 is an inner pipe, the outer pipe has an outer diameter that can be inserted into the drill pipe l, and the inner pipe 3 is an outer pipe that can be moved in the axial direction into the outer pipe. , 2.

A pin 4 and a hole expanding cutter S are attached to the lower end of the inner tube 3, and the inner tube 3 structurally serves as a bit holding section. The bit da is attached to the center of the lower end of the inner tube 3. The hole-expanding cutter S is attached to the inner tube 3 via a handle 6, and the handle O, which has the hole-expanding cutter S fixed to one end, is formed on the outer periphery of the lower end of the inner tube 3 at intervals of /2f, for example. A pin g is fitted in the groove 7 and is perpendicular to the diameter direction of the inner tube 3 within the groove 7.
It is attached to the inner tube 3 and can rotate in a plane parallel to the diameter direction of the inner tube 3 using the pin g as a fulcrum. A spring is inserted between the bottom of the groove 7 and the handle 6 from the other end of the pin g of the handle O, and the spring 9 causes the hole expanding cutter S protruding from the lower end of the drill pipe l to be positioned at the protruding position. The -1 part of the hole expanding cutter S can be moved beyond the outer diameter of the drill pipe I. Then, by moving the outer tube relatively to the inner tube 3, the lower end 2a of the outer tube can press and release the other end of the handle 6 from the outside and side, and the hole expanding cutter 5 can be moved into the drill pipe. The drill pipe 3 can be maintained inside the inner diameter of the drill pipe 3 or protruded beyond the outer diameter of the drill pipe 3.
A locking piece 10 is provided so as to fit within the outer periphery of the inner tube 3,
A portion of the locking piece 10 along the circumferential direction of the inner tube 3 is provided so as to be able to protrude to the outside of the inner tube 3 by a spring (not shown). A locking piece operation window is opened in a part of the outer tube where the locking piece 10 is located. The locking piece operation window // is a position where the hole expanding cutter S protrudes ahead of the lower end of the drill pipe l, a part of it protrudes outside the outer diameter of the drill pipe l, and is held by the lower end of the outer tube. A part of the locking piece IO can be made to protrude outside through the locking piece operation window /l. A part of the locking piece 10 protruding from the locking piece operation window/I is fitted into the inner surface of the drill pipe l, and the locking piece 10 is locked so as to be relatively immovable in the axial and circumferential directions of the drill pipe l. A recess 12 is formed to engage with the piece IO, and the locking piece 10 and the recess/2.
By this engagement, the inner tube 3 is fixed to the drill pipe 1, so that it can rotate together with the drill pipe 1 and can also move together in the axial direction.

The lower end Ja of the outer tube is separated from one end of the handle 6 and the hole expanding cutter S
When the outer tube is moved upward (to the ground side) so that it can be positioned inside the drill pipe l, a part of the electric key latch IO gradually moves into the outer tube and touches the edge of the lock piece operation chamber l of the outer tube. As shown in the lower half of FIG. 1, the outer tube λ is held in place by the inner surface of the outer tube λ.

The upper end of the inner pipe 3 on the ground side is slightly shorter inward than the upper end of the outer pipe, and when the outer pipe and the inner pipe 3 are moved relative to each other in the axial direction as described above, the inner pipe Approximately /
A fan-shaped water stopper piece 13 with an angle of 0° protrudes from the outer periphery of the outer tube and faces it, and is attached to the outer tube by spline fitting so that it cannot move in the circumferential direction. The outer tube is provided with a water hole that communicates with the inside and outside, and extends downward from between the stop pieces 13 to the part where the outer tube and the inner tube 3 always overlap.

There is a locking piece/ on the part of the inner pipe 3 facing the water hole/+ of the outer pipe.
3 is attached through a wedge so as not to be movable in the circumferential direction of the outer tube. The locking piece 15 projects outward from the water passage hole llI of the outer tube, and is formed so that it can form a closed ring with the water stopper piece /l.

The spline connecting the outer tube and the water stopper piece 13 is such that the spline provided on the outer surface of the outer tube is slightly longer than the axial width of the water stopper piece 13, and the water stopper piece 13 is axially connected to the outer tube. The locking piece IS can also be moved slightly in the axial direction with respect to the inner tube 3 as a wedge.

The above-mentioned locking piece 10 is engaged with the recess m/2 of the drill pipe l, and the outer tube has been moved to a position where the left hole expanding cutter can be held in a state of protruding beyond the outer diameter of the drill pipe l. So,
The water stop piece 13 and the locking piece /, 5- are located on the same circumference to form a torus, and the underground side end surface of this torus is connected to the inner surface of the drill pipe l. Contacting the formed annular step /6 facing the ground side, the water stop piece 13 and the locking piece /S cooperate with the annular step /A to connect the outer W and the drill pipe l. The water that has been sent from the ground side through the inside of the drill pipe is blocked to prevent it from flowing to the lower end side between the outer pipe and the drill pipe.

The locking piece /3 and the annular stage /6 have moved the outer pipe and the inner pipe 3 from the ground side to the underground side, and the locking piece IO is still in the recess /U.
When not engaged with the locking piece IO, the locking piece IO acts as a locking device that locks the inner tube 3 in a position opposite to the recess /2.

At the upper end of the outer pipe, there is a water intake port that is connected to the inner pipe 3, and the water that enters from the water intake port passes through the inner pipe 3 and flows from the lower end of the inner pipe 3. , is supplied near the bit holder and the hole-expanding cutter 5.

The upper end of the outer tube is also provided with a conical riveted protrusion that protrudes toward the ground side.

The bit holding section consisting of the outer tube, the inner tube 3, etc. moves the outer tube toward the upper end with respect to the inner tube 3 so that the hole expanding cutter S can be inserted into the drill pipe L, and also locks the bit. Stopper I
With O pressed into the outer tube by the outer tube,
Insert into the drill pipe l from the ground side end of the drill pipe l, supply pressurized water into the drill pipe from above,
Pressurized water is sent towards the underground end of the drill pipe.

The inner pipe 3 that has reached the underground side is stopped at the locked position by the locking piece 15 hitting the annular step /A. Next, due to inertia and water pressure, the outer tube moves underground, expands the hole expanding cutter S protruding from the lower end of the drill pipe/, and engages the locking piece 10 with the recess/U to open the drill. The pipe 1 and the inner pipe 3 are joined together. At the same time, the water stop piece /3 provided on the outer pipe hits the annular step lB to form a ring with the locking piece 15, and the water passes between the outer pipe and the drill pipe. Since water is prevented from flowing to the lower end of the pipe 1, water is supplied from the water intake port 17 through the inner pipe 3 to the vicinity of the hole opening cutter S.

In this state, if the drill pipe l is rotated from the ground and pushed into the ground at the same time, a hole can be drilled into the ground.

If the speed at which the drill pipe enters the ground decreases due to wear of the cutting edge of the drill bit or hole-expanding cutter S, etc., and it becomes necessary to replace the drill pipe or the hole-expanding cutter S, remove the hook from one end. Insert the wire attached to the drill pipe l into the drill pipe l, send the hook underground by water flow, and engage the hook with the protruding part 1g at the upper end of the outer pipe, and the wire is inserted into the inner pipe 3 and the outer pipe 2.
etc. can be pulled out to the ground. At this time, the outer tube is first moved to the ground side with respect to the inner tube 3 by the wire as shown in the lower half of FIG. Due to this movement of the outer tube, the method '731 +5 is placed within the inner diameter range of the outer tube, and the lock piece io is pushed into the outer tube 2 by the lock piece operation window // and is connected to the inner tube 3. The bond with drill pipe l is released. At the same time, the water stopper piece 13 is moved closer to the ground side than the locking piece /S and is at a different level, allowing water to pass underground through between the outer tube and the bird /I/via/. Since the inner pipe 3, outer pipe W2, etc. can be pulled up toward the ground using wires in the state shown in Figure 2, the water inside the drill pipe l will flow inside the inner pipe W3 and between the outer pipe and the drill pipe l. Since it passes through both sides and the load of water on pulling becomes small, the pulling soil water piece 13 and the locking piece lS are connected to the annular shape of the drill pipe l at the position where the locking piece 10 engages with the fourth part/2 of the drill pipe /. Step/6
If they are formed to be securely crimped, they may be fixed to the outer tube and the inner tube 3, respectively, so that they do not move in the axial direction. However, due to wear due to use, etc., the edge of the locking piece operation window l/ of the outer tube is biting into the locking piece IO, making it difficult to pull the locking piece IO into the outer tube. In order to facilitate unlocking by shaking or to allow for dimensional errors, the water stopper piece 13 and the locking piece /S are provided so as to be able to move slightly in the axial direction, as shown in the above embodiment. It is more convenient to use it.

In the present invention, an annular step 1 is provided on the inner surface of the drill pipe l to prevent water flow between the drill pipe l and the outer pipe l.
6 can also be used as a step to prevent the inner pipe 3 etc. from pulling out from the lower end of the drill pipe l, so there is a step to prevent water flow inside the drill pipe and a step to prevent pulling out as in the conventional drill pipe. There is no need to provide a separate stage, and the structure can be made simpler than before.

In addition, the water passage hole /V extends above the water supply piece /3 and the inner pipe 3
It is also possible to form this partial water intake port 17 so as to communicate with the inside.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of the drilling device according to the present invention, in which the upper half shows the state in which the inner pipe 3 is locked to the drill pipe l, and the lower half shows the state in which the inner pipe 3 is released from the drill pipe l. FIG. 2 is a perspective view showing the relative positions of the outer tube shown in FIG. 1 and 2, and FIG. 9 is a perspective view showing the relationship between the water stopper piece /3 and the locking piece IS.

Claims (1)

[Claims] (1) A drill pipe, an outer pipe that can be inserted into the drill pipe, and an inner pipe that is movably inserted in the outer pipe in the axial direction, and the inner pipe is connected to the inner pipe at the lower end of the drill pipe. A portion of the attached locking piece protrudes from the locking piece operation window provided on the outer tube and engages with the four parts provided on the inner surface of the drill pipe, making it immovable relative to the drill pipe and also able to rotate together with the drill pipe. At the same time, the bit and hole expanding cutter provided at the lower end of the inner pipe protrude beyond the lower end of the drill pipe, and one end of the hole expanding cutter is held in a state of protruding outside the circumferential surface of the drill pipe. In the device, the upper end of the outer tube has a water intake port that communicates with the inner tube, and the fan-shaped stop piece on the upper outer circumference of the outer tube causes the outer arcuate surface to protrude from the outer circumference of the outer tube and moves in the circumferential direction. A water hole is formed in the outer tube that extends between the water stop pieces toward the lower end of the outer tube and communicates with the inside and outside of the outer tube. A locking piece forming a closed ring is attached to the inner pipe so that it cannot move in the circumferential direction, and the locking piece and water stop are installed at the position where the locking piece provided on the inner pipe engages with the recess provided on the inner surface of the drill pipe. A drilling device characterized in that an annular step facing the ground side is provided on the inner surface of the drill pipe so as to be in contact with the drill piece. (e) The drilling device according to claim (1), wherein the water stop piece is installed to be slightly movable in the axial direction with respect to the outer pipe, and the locking piece is installed to be slightly movable in the axial direction with respect to the inner pipe. .