JPS6223910Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a screw-mounted split borehole tube for a ground drilling machine, which allows easy and safe screw removal treatment after completion of drilling.

The drilling tube used for drilling in the ground has a drilling cutting edge (core tube, metal crown, diamond bit for rotary types, tip bit, dowser hole hammer, 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,
A drilling pipe corresponding to the desired depth is constructed by connecting an appropriate number of segmented drilling pipes that are divided into lengths of 1500 mm to 3000 mm.
Drilled pipes with diameters of 33 to 100 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 100mm 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,
The key q is inserted into the key q, and the bolts t are installed into the matching bolt holes r and s of the two divided drilled pipes a and a' during this fitting.

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 arranging it so as to connect it to the uppermost divided drilled tube and joining it by the method described above, the added divided drilled tube is 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 from the second divided hole tube in a manner appropriate to each connection method, and then the chuck is lowered and the chuck is At the same time as chucking the second split borehole tube which is now located at the top, the borehole tube holding device is released and the uppermost split borehole tube is separated again in the same manner as described above. By repeating these operations, separation and recovery operations are accomplished.

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.

Therefore, the present invention provides a screw-mount type segmented drilling pipe for a ground drilling machine, which has a simple structure and can eliminate the above-mentioned problems.

Hereinafter, this invention will be described as hard hole drilling machine B shown in Fig. 6.
An embodiment in which the present invention is applied to the divided drilled pipes 6 and 6' will be described.

The figure shows a state in which the hard hole drilling machine B is drilling a hard hole in the ground, and the drilling pipe 3, which is chucked by the chuck 2 of the spindle 1, is in the ground 4 by the rotation and descent of the spindle 1. Desired hard hole 5
Drill a hole.

The drilling pipe 3 is constructed by connecting a large number of divided drilling pipes 6, 6' with screw mounts, and the split drilling pipe 6 located at the top is connected to the chuck 2. The divided drilling pipe 6' located at the lowermost part 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.
Further, a male thread 9 of a predetermined length (excluding the lowermost divided drilled pipe 6') is formed on the outer circumferential surface of the lower end to be screwed into the female thread 8, and the male thread 9 of the divided drilled pipe 6 located on the upper side is formed. The two are connected by screwing into the internal thread 8 of the divided drilled tube 6 or 6' located below. Each of the divided drilled tubes 6, 6' has a through hole 10 formed in its upper part, that is, slightly below the female thread 8, and which extends across the axis. A guide tube 11 is fitted into the guide tube 11, which is positioned flush with or within the outer circumferential surface of the divided drilled tube 6 or 6', and which is fixed by welding the outer circumferential portions of both ends thereof.

In order to add and connect the divided drilling tubes 6 having the above structure when increasing the drilling depth, first, as in the conventional structure, first, the drilling tubes 3 currently installed in the hard hole drilling machine B. A drilling pipe holding device 12 installed above the hard hole 5 is attached to the bottom of the divided drilling pipe 6 located at the top of the hole.
After the chuck 2 is held by the hole drilling tube holding device 12, the chuck 2 is released, and the supplementary divided hole drilling tube 6 is inserted into the section, and its male thread 9 is inserted into the divided hole hole held by the hole drilling tube holding device 12 as described above. It is threadedly connected to the internal thread 8 of the pipe 6.

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 direction of the female thread 8 and male thread 9 of the divided hole-drilled 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, so in this case, the rotation is clockwise.) Turn the screw slightly at low speed to loosen the threaded connection, and then connect the upper and lower split hole pipes 6, 6'. Without unscrewing, the reaction bar 13 is removed and the spindle 1 is raised to its highest limit as shown in FIG. 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. Make sure that the through hole 10 of the second divided drilling pipe 6 is located above the ground, insert the reaction bar 13 into the guide tube 11 again, and unscrew the uppermost divided drilling pipe 6 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 18 that are attached to the upper end of the uppermost divided drilling pipe 6 during ground drilling. This is a swivel device for mounting.

In summary, the screw-mount type segmented drilling pipe of the ground drilling machine according to this invention has an appropriate number of reaction bar insertion through-holes formed in the axial direction and transverse to the axial center. By inserting a separately prepared reaction force bar into the reaction force bar insertion through hole and operating the reaction force bar in the manner described in the embodiment, the screws can be easily removed and separated. In addition, even when the bonding strength between each segmented drilling pipe is extremely high when drilling in hard ground, the screws can be easily separated by using mechanical force, and at the same time, the chain tongs can be easily separated. This is a safe operation as there is no risk of damage as in the case of other methods. In addition, compared to using conventional tools to remove screws, it is possible to reduce labor and time, and unlike conventional methods, which require tools according to the hole diameter, It has many practical industrial benefits, such as the ability to use one reaction force bar in common even for hole diameters within a considerable range, making it easier to manage auxiliary tools.

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 when the hole pipe function is hindered, and when drilling work is not required, plugs 23 and 24 fixed with a retaining ring 21 and 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 1 are installed as shown in FIG. 14 in the case of FIG. 3, and as shown in FIG. 16 in the case of FIG.
1d.

Although this invention has been explained using the example of a screw-mount type split-hole tube for a hard-hole drilling machine, it can also be applied to a screw-mount type split-hole tube for a horizontal or oblique hole-drilling machine. Alternatively, it is also applicable to a split type earth auger. Also,
The through hole may be left as it is without a guide tube, the installation location and number of installation holes may be changed as appropriate, and various other changes may be made without departing from the technical idea stated in the claims for utility model registration. Design changes are possible.

[Brief explanation of the drawing]

Figures 1 to 3 and Figure 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 plan view of the main part of Figure 3. A front view showing a ground drilling machine using the split drilling pipe of the example, Fig. 7 is a partially cutaway side view of the split drilling pipe, and Figs. 8 to 10 show the same split drilling machine, respectively. Side views illustrating the method of unscrewing the pipe, Figures 11 to 16
Each figure is a partially cutaway side view showing a modified example of the through hole provided in the same divided drilled pipe. 6, 6'...Divided drilled pipe, 10...Through hole, 1
1 to 11d...Guide tube, 13...Reaction force bar.

Claims (1)

[Claims for Utility Model Registration] (1) Screw-mount type division of a ground drilling machine characterized by forming an appropriate number of reaction bar insertion through-holes extending in the axial direction and transverse to the axial center. Drill pipe. (2) The screw-mount type split drilling pipe for a ground drilling machine according to claim 1 of the utility model registration claim, wherein a guide tube is installed in the reaction bar insertion through hole. (3) The screw-mounted split drilling pipe for a ground drilling machine according to claim 2 of the utility model registration claim, wherein the guide pipe is removable.