JPS6216308B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for unthreading a screw-mounted split borehole tube in a ground drilling machine, which allows the borehole tube treatment after completion of drilling to be carried out easily and safely.

The drilling tube used for drilling holes in the ground has a cutting edge (a core tube, metal crown, or diamond bit for rotary types, or a tip bit, dowser hole hammer, or bit for rotary percution types). ) to the specified depth.

A conduit that carries a fluid such as cooling water or cooling air that absorbs the frictional heat of the cutting edge.

A conduit for bentonite slurry for the purpose of holding the hole wall.

A conduit that carries the working fluid of a dowser, hole, hammer, etc.

Applies the pressing force necessary for digging to the cutting edge.

It is used to perform functions such as recovering the cutting edge to the ground, but depending on the drilling depth,
By connecting an appropriate number of divided drilled tubes divided into lengths of 1500 mm to 3000 mm, a drilled tube corresponding to the desired depth is constructed.

As for the connection method of the above-mentioned split hole pipe, the hole diameter is
Drilled pipes with diameters of 33Φ to 100Φ are usually screw-mounted as shown in Figures 1 and 2, with exceptions as shown in Figures 3 and 4.
A hexagonal boss connection as shown in the figure is seen, and for large diameter drilled pipes with a hole diameter of 100Φ or more, a boss and key connection as shown in FIG. 5 is usually used.

As shown in the figure, the screw mount has a female thread b formed at the end of one drilling pipe a and a male thread c formed at the end of the other drilling pipe a'. They are connected by screwing together (see Figure 1), or the female thread d formed at the end of one drilling pipe a and the female thread e formed at the end of the other drilling pipe a' Both drilled tubes a and a' are connected via a socket g having male screws f and f' at both ends (see Fig. 2). In the case of this threaded connection, threads are provided that are cut in a direction opposite to the direction of rotation of the borehole tubes a, a'.

The hexagonal boss connection is mainly suitable for drilling in hard ground, and as shown in the figure, a hexagonal boss h formed at the end of one drilling pipe a is formed at the end of the other drilling pipe a′. Bolts l are fitted into the hexagonal recesses i formed in the hexagonal recesses i, and are fitted into bolt holes j and k provided in the fitting portions of both drilled tubes a and a' that coincide during this fitting.

In addition, the boss and key combination is
It has a structure that can handle high rotational force, and has a boss n formed at the end of one segmented borehole tube a and having a keyway m, and an end of the other segmented borehole tube a′. A recess p having a key groove o is inserted into the recess p so that both key grooves m and o are aligned, and the key groove m,
Insert the key q into the key q, and at the same time, attach the bolts t to the corresponding bolt holes r and s of the split drilled pipes a and a'.

In addition, when using any of these connection methods to connect split drilling pipes to increase the drilling depth, in the case of a hard drilling machine, the drilling pipe holder installed above the drilling section is used. A device (pipe holder) holds the currently used drilling pipe, and at the same time the chuck of the drilling machine is released, and an additional split drilling pipe is held in the drilling pipe holding device. After the uppermost divided drilled tubes are arranged so as to be connected and joined by the above method, the joined divided drilled tubes are chucked with a chuck.

Furthermore, when the prescribed drilling work is completed, each of the divided drill tubes that have been joined as described above is separated and recovered. Adjustment is made by raising and lowering the chuck so that the connecting part of the second connected split drilling pipe is located on the ground, and then the drilling pipe holding device is activated to separate the second split drilling pipe. While holding the hole tube, the chuck is released to separate the uppermost divided hole tube according to each connection method from the second divided hole tube, and then the chuck is lowered and the chuck is At the same time as chucking the second split borehole pipe that is now located at the top, the drill tube holding device is released and the uppermost split borehole pipe is separated again using the procedure described above. The collection work is accomplished by repeating the steps.

By the way, when carrying out the separation and recovery work mentioned above, for split drilled pipes that are connected by a screw mount method, a pipe wrench or chain tongs or the like is used as an auxiliary tool to remove the screws. tools are used.

According to this, screw removal work requires a great deal of labor and time, and these costs tend to increase in proportion to the diameter of the drilled hole. In some cases, tools may be damaged due to forced work, making the work inefficient and dangerous.

SUMMARY OF THE INVENTION Therefore, the present invention provides a method for unthreading a screw-mount type divided drilling pipe in a ground drilling machine, which can easily eliminate the above-mentioned problems.

Embodiments of the present invention will be described below based on the drawings.

FIG. 6 shows the hard hole drilling machine B in the process of drilling a hard hole in the ground, and the drilling pipe 3, which is chucked in the chuck 2 of the spindle 1, is drilled into the ground 4 by the rotation and descent of the spindle 1. A desired hard hole 5 is drilled.

The drilling pipe 3 is constructed by connecting a large number of divided drilling pipes 6 with screw mounts, and the split drilling pipe 6 located at the top is chucked by the chuck 2. The divided drilling pipe 6' located at the bottom has a metal crown 7 for drilling at its lower end.

As shown in FIG. 7, each of the divided drilled tubes 6, 6' has a female thread 8 of a predetermined length formed on the inner circumferential surface of the upper end, and a female thread 8 of a predetermined length that is screwed with the female thread 8 on the outer circumferential surface of the lower end. A long male thread 9 (excluding the lowermost segmented drilling pipe 6') is formed, and the male thread 9 of the upper segmented drilling pipe 6 is connected to the lower segmented drilling pipe 6 or 6'. The two are connected by screwing into the female thread 8. Here, in the upper part of each divided hole drilling pipe 6, 6', that is, slightly below the female thread 8,
A through hole 10 is formed transverse to the axis, and both ends of the through hole 10 are fitted with a drilled tube 6 or 6'.
It is located on the same or within the outer peripheral surface of
A guide tube 11 is fitted into the guide tube 11, which is fixed by welding the outer peripheral portions of both ends thereof.

In order to add and connect the split drilling pipes 6 having the above structure to increase the drilling depth, first, as in the conventional structure, first, the drilling pipes currently installed in the hard hole drilling machine B. A drilling pipe holding device 1 installed above the hard hole 5 below the divided drilling pipe 6 located at the top of the hole 3
2, the chuck 2 is released, a supplementary split drilling pipe 6 is inserted into the part, and its external thread 9 is connected to the drilling pipe holding device 12 as described above.
It is threadedly connected to the internal thread 8 of the divided drilled tube 6 held in the .

In addition, in order to complete the drilling of the desired hard hole 5 and separate and recover the drilling tube 3, the spindle 1 is raised and the split hole located second from the top is removed, as shown in FIG. The through hole 10 of the hole pipe 6 is positioned above the ground, and a reaction bar 13 made of round steel bar is inserted into the guide tube 11, and one end of the reaction bar 13 is brought into contact with the base 14 of the hard hole drilling machine B. let After that, the spindle 1 is rotated in the direction opposite to the thread direction of the female thread 8 and male thread 9 of the split drilling pipe 6 (normally, the female thread 8 and male thread 9 are right-handed, so the rotation is counterclockwise, but for small diameter pipes (In most cases, the threads are left-handed, and in this case, the rotation is clockwise.) Turn the screw slightly at low speed to loosen the threaded connection, and screw the upper and lower split hole pipes 6, 6 as they are. without letting it come off,
After removing the reaction bar 13, as shown in FIG.
Raise spindle 1 to the maximum limit. Once this is done, the drill tube 3 is held by the drill tube holding device 12 installed as described above, the chuck 2 is opened, and the uppermost divided drill tube 6 is screwed off by hand. Next, as shown in FIG. 10, the spindle 1 is lowered to the lowest limit again, and the divided drilling tube 6 located at the top is chucked with the chuck 2, and at the same time, the drilling tube holding device 12 is released and the drilling tube holding device 12 is released. The through hole 10 of the th divided drilling pipe 6 is located above the ground, the reaction bar 13 is inserted into the guide tube 11 again, and the uppermost divided drilling pipe 6 is screwed off through the above-mentioned procedure. By repeating these operations, separation and recovery of the borehole tube 3 is achieved.

In the figure, 15 and 15' are cylinders for raising and lowering the spindle 1, and 16 is a bentonite slurry water supply hose 17 and a cooling air hose that are attached to the upper end of the uppermost divided drilling pipe 6 during ground drilling. This is a swivel device for mounting No. 18.

In summary, the method for unscrewing a screw-mount type split drilling pipe in a ground drilling machine according to the present invention is a method for unscrewing a split drilling pipe on a connecting side that is connected to a split drilling pipe on a connected side. Insert the reaction bar into the transverse through-hole and attach it, and while restraining one end of the reaction bar by any means, turn the ground drilling machine slightly in the opposite direction to the drilling direction to connect the connected side and Since the screw connection of the divided drilled tube on the connecting side is loosened, and then the divided drilled tube on the connected side is screwed and separated from the divided drilled tube on the connected side, it is a divided drilled tube. The through hole is formed in the through hole, and a reaction force bar inserted into the through hole is separately inserted into the through hole.
By preparing this method, it is possible to separate and recover the drilled tube at low cost by using the mechanical power of the drilling machine.

Furthermore, when drilling holes in hard ground, mechanical force is used even if the bonding force between each segmented drilling pipe is extremely high, so screws can be easily removed and separated, and at the same time tools can be used. This is a safe operation as there is no risk of damage like in the case of In addition, it is possible to reduce the work effort and time compared to using conventional tools to remove and separate the screws, and
Unlike the conventional method, which requires tools depending on the diameter of the hole being drilled, one reaction bar can be commonly used even for holes with a considerable range of diameters, making it easier to manage auxiliary tools. There are many industrial benefits.

Figures 11 to 16 show divided borehole pipes 6 and 6', respectively.
A modified example of the through hole 10 portion provided in the 11th
What is shown in the figure and FIG. 12 is the guide tube 11a, 11.
b is fitted into the through hole 10 and then fixed with a retaining ring 19 and a screw 20, and those shown in FIGS. This structure is used in cases where the hole pipe function is hindered, and when drilling is not performed, a retaining ring 21 and plugs 23 and 24 fixed with screws 22 are installed inside the through hole 10. When performing drilling work, remove these plugs 23 and 24, and
The guide tubes 11c and 11 are arranged as shown in FIG. 14 in the figure, and as shown in FIG. 16 in the case of FIG.
d.

Although this invention has been explained by taking as an example a screw-mount type split hole-drilling tube for a hard-hole drilling machine, the present invention can also be applied to a screw-mount type split-hole drilled tube for a horizontal or oblique hole-drilling machine. Alternatively, it can also be applied to a split type earth auger, and
The installation location and number of transverse through-holes formed in the split borehole pipe can be changed as appropriate, and the split borehole pipe loosened by the mechanical force of the drilling machine utilizes the rotational force of the drilling machine. Alternatively, various other design changes can be made without departing from the technical idea set forth in the claims.

[Brief explanation of the drawing]

Figures 1 to 3 and 5 are partially cutaway front views illustrating the connection method of split borehole pipes, Figure 4 is a cross-sectional plan view of the main part in Figure 3, and Figure 6 is a cross-sectional view of the present invention. Fig. 7 is a partially cutaway side view of the same divided drilling pipe, and Figs. A side view for explaining the screw removal method, and FIGS. 11 to 16 are partially cutaway side views showing modified examples of through holes provided in the same split-hole pipe, respectively. B...Hard hole drilling machine, 1...Spindle, 2...Chuck, 5...Hard hole, 6...Divided hole drilling pipe, 8...Female thread,
9...Male thread, 10...Through hole, 12...Drilled tube holding device, 13...Reaction force bar, 14...Base.

Claims (1)

[Scope of Claims] 1. A reaction bar is inserted and installed into a transverse through-hole formed in a divided drilled pipe on the connecting side that is connected to the split drilled pipe on the connected side, and one end of the reaction bar is attached. The ground drilling machine is slightly rotated in the opposite direction to the drilling direction while restraining it by any means to loosen the screw connections of the split drilling pipes on the connected side and the connected side, and then the connected 1. A method for screwing out a screw-mounted split hole pipe in a ground drilling machine, characterized in that a connecting side split hole pipe is separated from a side split hole pipe. 2 Insert the reaction bar into the transverse through-hole formed at the top of the second split-hole pipe that is connected to the split-hole pipe located at the top and chucked with a chuck. The threaded connection between the two split drilling pipes is loosened by slightly turning the ground hard hole drilling machine in the opposite direction to the drilling direction while bringing one end of the reaction bar into contact with a part of the machine body, and then , the reaction bar is removed and the chuck is raised to a predetermined position, the drilling tube holding device installed above the drilling section is activated to hold the drilling tube, and then the chuck is released and the chuck is raised to the top position. 1. A method for screwing out a screw-mount type split borehole pipe in a ground drilling machine, characterized in that the split borehole pipe is manually unscrewed.