JPH0718667A - Joint section structure of screw rod for underground boring machine - Google Patents

Abstract

PURPOSE:To make a screw rod hardly deflected longitudinally and to the right or left against the center axis by forming coupling sections having an angular cross section, upper spigot sections, and lower spigot sections on a plug section and a socket section so that they are coupled with each other. CONSTITUTION:In this joint section structure, the male lower spigot section 54b of a plug section 54' is coupled with the female upper spigot section 55b of a socket section 55', and the male upper spigot section 54f of the plug section 54' is coupled with the female lower spigot section 55f of the socket section 55'. The spigot sections 54b-55b, 54f-55f are coupled with each other at two upper and lower positions of a columnar coupling section 54a and a cylindrical coupling section 55a coupled together with a play. Even though a play (gap) is formed between the cylindrical coupling section 54a and the columnar coupling section 55a, the deflection of the plug section 54' against the socket section 55' is effectively suppressed by the upper and lower spigot sections 54b-55b, 54f-55f, and a screw rod 50' is hardly deflected longitudinally and to the right or left against the center axis.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw rod joint structure for an underground drilling machine, which can be added depending on the depth of a drilling hole to be drilled.

[0002]

2. Description of the Related Art Conventionally, as an underground drilling machine, for example,
As can be seen in Japanese Patent Laid-Open No. 55-119885, the required number of screw rods having spiral blades on the outer circumference are sequentially connected to a power unit including a geared motor, a swivel device, and the like. There is known a structure in which an air hammer is connected to the lower stage, and an excavation hole is formed in the ground by lowering them while rotating them integrally along a leader mast.

The screw rod used in such an underground drilling machine is usually constructed such that the overall shape and the interconnected state are shown in FIGS. 8 and 9, respectively.
That is, the screw rod 50 includes the rod body 51
Is provided with a spiral blade 52 on the outer periphery thereof, a plug portion 54 forming a male joint and a female joint, and a socket portion 55 into which the plug portion 54 is fitted are provided at upper and lower ends, and an air hammer drive is provided inside. An air passage 45A made up of a pipe 45a for supplying compressed air for use in the vertical direction, and the plug portion 54 or the socket portion 55 is provided with a socket portion 55 provided at (the screw rod 50 of) the connection partner. Alternatively, the plugs 54 are connected to each other by inserting the packings 70 with the packings 70 interposed between the respective end surfaces.

Here, as shown in FIG. 9, the plug portion 54 constituting the male joint has a columnar fitting portion 54a having a regular hexagonal cross-section in the order from the tip side, and the base of the columnar fitting portion 54a. A male type anchoring portion 54b provided on the side and having a larger cross-sectional outer diameter than that, and a tip end of a socket portion 55 having a diameter larger than the male type anchoring portion 54b and forming a female joint with the distal end of the main body portion 51. A collar-shaped portion 54c having a circular cross-sectional outer shape, and an insertion portion 54d protruding from the lower side of the collar-shaped portion 54c and inserted into the tip portion (upper end portion) of the rod body 51. One end of a pipe 45a that forms the air passage 45 is inserted so as to extend vertically through the center of the pipe.

On the other hand, in the socket portion 55 which constitutes the female joint, the female type soldering portion 55b into which the male type soldering portion 54b of the plug portion 54 is fitted and the columnar fitting of the plug portion 54 are sequentially inserted from the front end side. The inner periphery into which the mating portion 54a is fitted has a cylindrical fitting portion 55a having a regular hexagonal cross section, and the packing 7.
The packing insertion portion 55e having a diameter slightly larger than that of the tubular fitting portion 55a, into which 0 is fitted, and the collar-shaped portion 5 of the plug portion 54.
A bottom wall 55c having the same diameter as 4c, with which the packing 70 is abutted, and receiving the tip of the rod body 51;
The bottom of the bottom wall 55c is provided with an insertion portion 55d protruding from the bottom and inserted into the tip (lower end) of the rod body 51. The air passage extends vertically through the central portion. The other end of the pipe 45a forming the pipe 45 is inserted.

The packing 70 is made of a rubber disc having elasticity and elasticity, and is approximately the amount of extension when the rod is connected, as compared with the packing insertion portion 55c of the socket 55. It has a small diameter, and a circular air opening 72 having a diameter slightly larger than that of the air supply passage 45a is formed in the central portion thereof. It should be noted that the screw rod 50 having the above-described configuration is provided with the plug portion 54 and the socket portion 55.
Are fitted together with the packing 70 interposed between the top surface and the bottom surface of the plug portion 54 and the socket portion 55.
Pin insertion portions 57 provided on the left and right sides of the
57, 58 and 58 have spring pins 56 and 56, respectively.
It is designed to be inserted and connected.

[0007]

In the joint portion structure as shown in FIG. 9 described above, the male type soldering portion 54b and the female type soldering portion 55b of the plug portion 54 and the socket portion 55 are fitted together. Together with the plug part 5
The columnar fitting part 54a of No. 4 is the cylindrical fitting part 5 of the socket part 55.
5a, the columnar fitting portions 54a,
Since the tubular fitting portion 55a has a square shape (here, a regular hexagonal cross section), the columnar fitting portion 54a is loosely inserted into the tubular fitting portion 55a, in other words, there is a play (a gap between them). ) Is usually formed.

However, since the screw rod of the underground drilling machine is driven into the ground while rotating while being replenished as described above, the plug portion 5 is used as described above.
4 columnar fitting part 54a and the cylindrical fitting part 5 of the socket part 55
If play is formed between the 5a, the one screw rod 50 and the other screw rod 50 sway back and forth and left and right with respect to the central axis C as shown by the white arrow in FIG. Serious problems such as disconnection and damage to joints were likely to occur.

In view of the above point, the present invention allows the male and female anchor parts of the plug part and the socket part to be fitted together, and the angular columnar fitting part of the plug part to be the cylinder of the socket part. Even if there is play (gap) between the cylindrical fitting part and the columnar fitting part when it is fitted into the cylindrical fitting part, it can be difficult to swing back and forth and left and right with respect to the central axis, and air leakage and An object of the present invention is to provide a joint structure of a screw rod for an underground drilling machine, in which a problem such as damage to the joint is prevented.

[0010]

In order to achieve the above-mentioned object, a joint portion structure of a screw rod for an underground drilling machine according to the present invention is such that the plug portion is a columnar fitting portion having a rectangular cross section and the columnar fitting portion. In addition to the male lower anchor part, which has a circular cross-section with a larger diameter than that provided on the root side of the part,
The columnar fitting portion is provided with a male upper splicing portion having a circular cross-section and having a smaller diameter than that of the male part, and the socket portion is fitted with the male lower splicing portion of the plug portion. In addition to the female upper anchor part to be fitted and the cylindrical fitting part whose inner circumference is square in which the columnar fitting part of the plug part is fitted, the male upper anchor part of the plug part is fitted. It is characterized in that it is provided with a female type lower splicing part to be fitted.

[0011]

[Operation] In the joint structure of the screw rod for an underground drilling machine according to the present invention having the above-described structure, the male lower bracing part of the plug part is fitted to the female upper brazing part of the socket part. In addition to being mated, the male upper bracing part of the plug part is fitted to the female lower brazing part of the socket part. In other words, the spigot parts are fitted at two upper and lower positions of the columnar fitting part and the tubular fitting part which are fitted with each other with play so as to be interconnected.

Therefore, even if a play (gap) is formed between the cylindrical fitting portion and the columnar fitting portion, the deflection of the plug portion with respect to the socket portion can be effectively suppressed by the upper and lower anchor portions. As a result, it is possible to prevent the screw rod from swinging forward, backward, leftward, and rightward with respect to the central axis, and prevent problems such as air loss and damage to the joint portion.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 show an example of a screw rod for an underground drilling machine to which a joint portion structure according to the present invention is applied and a connection state thereof, and in these drawings, it is shown in FIGS. 8 and 9 described above. The same reference numerals are given to the portions corresponding to the respective portions of the conventional one.

The screw rod 50 'shown in FIG.
Is applied to an underground drilling machine (see Japanese Patent Application No. 5-93145, etc.) in which a soil-reinforcing material such as cement milk is ejected from the vicinity of the tip of an air hammer connected to the lowermost stage. Basically, as shown in FIG.
The configuration is similar to that shown in. That is, in the screw rod 50 ', the spiral blade 52 is provided on the outer periphery of the rod body 51, and the plugs as shown in FIG. 2 and FIG. A portion 54 ′ and a socket portion 55 ′ are provided, and the plug portion 54 ′ or the socket portion 55 ′ is a mating partner (the screw rod 50 ′)
To the socket portion 55 'or the plug portion 54' provided in
The packing 7 as shown in FIG. 6 is provided between the respective tip surfaces.
It is designed to be connected by inserting with 0 intervening.

The screw rod 50 'is provided with an air supply passage 45A and a cement milk supply passage 46A so as to extend vertically therethrough. Specifically, a pipe 45a that constitutes an air supply passage 45A is bridged between the plug portion 54 'and the socket portion 55' so as to pass on the center line of the screw rod 50 ', and further, the air supply Pipe 45a that constitutes the passage 45A
Pipes 46a, 46a forming an intermediate portion of the cement milk supply passage 46A are bridged on both sides of the air supply passage 45A and the cement milk supply passage 46A in the plug portion 54 'and the socket portion 55'. Through-holes 45b, 46b, 45c and 4 which constitute both ends of 46A
6c is formed.

Further, at both ends of the pipe 45a forming the air supply passage 45A and the pipes 46a, 46a forming an intermediate portion of the cement milk supply passage 46A, a metal disk inscribed in the outer cylinder portion 51 is formed. Partition plate 92,
92 is attached to the pipe 45.
A steady rest 80 is attached to the central portion of a, 46a, 46a.

As shown in FIGS. 4 and 5, the plug portion 54 'constituting the male joint has a columnar fitting portion 54a having a regular hexagonal cross section, and the columnar fitting portion 5'.
4a, which is provided on the base side of 4a and which has a larger diameter than that and has a circular cross-section.
A collar-shaped portion 54c having a larger diameter than 4b and having a circular cross-sectional outer shape for receiving both the tip of the main body portion 51 and the tip of the socket portion 55 'constituting the female joint, and is provided so as to project below the collar-shaped portion 54c. And the tip portion (upper end portion) of the rod body 51
In addition to the insertion portion 54d which is inserted into the upper end of the columnar fitting portion 54a, a male upper anchoring portion 54f having a circular cross-section with a smaller diameter than that is projectingly provided at the tip of the columnar fitting portion 54a, and the central portion is vertically penetrated. 45a for forming the air passage 45 so that
End of the pipe is fitted and the pipes 46 forming the cement milk supply passages 46A and 46A are provided on both sides thereof.
The ends of a and 46a are inserted.

On the other hand, the socket portion 55 'constituting the female joint has a female upper wire portion 55b to which the male lower wire portion 54b of the plug portion 54' is fitted.
A cylindrical fitting portion 55a having a regular hexagonal cross-section on the inner periphery into which the columnar fitting portion 54a of the plug portion 54 'is fitted.
An annular portion 55g having a diameter larger than 5a, a female lower bracing portion 55f into which the male upper bracing portion 54f is fitted, and a packing 70 'described later, in which the tubular fitting portion 5 is fitted.
5a, a packing insertion portion 55e having a diameter slightly larger than 5a, a bottom wall portion 55c for receiving the tip of the rod main body portion 51 while the packing 70 'having the same diameter as the flange portion 54c of the plug portion 54' is abutted, and In addition to the insertion portion 55d protrudingly provided on the lower side of the bottom wall portion 55c and inserted into the tip portion (lower end portion) of the rod main body portion 51, the bottom wall portion 55c is also included.
Of the pair of cement milk supply passages 46A, 46A (46) on both sides of the air supply passage 45A (45c) in
c, 46c), the packing 70 '
The recesses 55h, 55h having a pair of circular cross-sections into which the projections 76, 76 (described later) are fitted are bored at 180 ° intervals, and the air passage 45 is formed so as to vertically pass through the central portion thereof. The end of 45a is fitted and the cement milk supply passage 46A,
The ends of the pipes 46a, 46a that form 46A are inserted.

Further, as shown in FIG. 6, the packing 70 'is made of a rubber disc having elasticity and stretchability, and is larger than that of the packing insertion portion 55c of the socket 55'. The diameter of the air is about the same as the amount of extension when the rods are connected, and a circular air opening 72 having a diameter slightly larger than the air supply passage 45a is formed in the central portion thereof, and the cement milks are provided on both sides thereof. Supply passage 46A
Larger oval shaped openings 74,7 for cement milks
4 is formed, and 180 on one surface side is a pair of convex portions 76, 76 having a pair of circular cross sections that are fitted into the concave portions 55h, 55h provided in the socket portion 55 '.
° Projected at intervals.

The screw rod 50 'having the above construction
The plug portion 54 'and the socket portion 55' are fitted with the packing 70 interposed between the top surface and the bottom surface of the plug portion 54 'and the socket portion 55', and the plug portion 54 'and the socket portion 55' are provided on the left and right in different steps. Pin insertion parts 57, 57, 5
The spring pins 56 and 56 are inserted into 8 and 58, respectively, and are connected.

In this case, when the packing 70 'is arranged between the screw rods 50, 50,
Recesses 55h, 55h provided in the socket part 55 '
Then, the convex portions 76, 76 provided on the packing 70 'are fitted. Thereby, the packing 70 'and the socket 55'
And an opening 72 for air and an opening 74 for cement milk, which are provided in the packing 70 ',
74 and the air supply passage 4 provided in the socket 55 '
5A (45c) and cement milk supply passage 46A,
46A (46c, 46c) is matched.

Then, in the above state, the screw rod 5
Connect the mating screw rod 5 to the 0'socket part 55 '.
When the 0'plug portion 54 'is aligned and inserted, the air supply passage 45A (45c) on the socket portion 55 side is inserted.
And cement milk supply passages 46A, 46A (46
c, 46c) and the air supply passage 45 on the plug portion 54 'side
A (45b) and cement milk supply passages 46A, 4
6A (46b, 46b) communicates with each other via the packing 70 '.

As described above, in the joint portion structure of the present invention, the convex portions 76, 76 of the packing 70 'are connected to the socket portion 5.
Since the screw rod 50 'is connected by fitting into the recesses 55h, 55h of 5', the packing 70 '
Can always be positioned easily and properly, and undesired behavior of the packing 70 'is blocked when the screw rod 50' is refilled, and as a result, other than the openings 72, 74 of the packing 70 '. Is the air supply passage 45A and the cement milk supply passage 46
A situation in which A and 46A are blocked is reliably avoided, and it is possible to perform replenishment work and the like in an extremely efficient and quick manner.

In addition to the above, in the joint structure of this embodiment, in addition to the fact that the male lower anchor part 55b of the plug part 54 'is fitted to the female upper anchor part 55b of the socket part 54', The male upper wax part 54f of the plug portion 54 'is fitted to the female lower solder part 55f of the socket portion 55'. In other words, the brazing parts 54b-55b, 54f-55f are provided at two upper and lower positions of the columnar fitting part 54a and the tubular fitting part 55a which are fitted with play.
Are engaged with each other for interconnection.

Therefore, even if a play (gap) is formed between the cylindrical fitting portion 54a and the columnar fitting portion 55a, the runout of the plug portion 54 'with respect to the socket portion 55' is the upper and lower brazing portions. Anchor parts 54b-55b, 54f-55
effectively suppressed by f, resulting in screw rod 5
It is possible to prevent 0 ′ from swinging forward and backward and to the left and right with respect to the central axis, and prevent problems such as air escape, leakage of cement milk, and damage to the joint.

In the above description, the connection between the screw rods 50 'has been described as an example.
When connecting 0'and other members such as a swivel device or an air hammer, the plug portion 54 'similar to the above is also connected to them.
Alternatively, it is needless to say that it can be applied if the socket portion 55 'is provided. In the above example, the air supply passage 45A and the cement milk supply passage 46A are connected to the pipes 45a, 46.
Although the screw rod 50 'constituted by a is illustrated, as the screw rod, as shown in FIG. 7, in addition, as shown in FIG. 7, a solid rod is provided with an air supply passage 45A and a cement milk supply passage 46A perforated (50 '') Etc. are also acceptable.

[0027]

As can be understood from the above description, according to the joint structure of the present invention, the bracing parts are fitted at the upper and lower two positions of the columnar fitting part and the tubular fitting part. Since the interconnections are made, even if a play (gap) is formed between the cylindrical fitting portion and the columnar fitting portion, the deflection of the plug portion with respect to the socket portion is effectively caused by the upper and lower anchor portions. As a result, it is possible to obtain the excellent effect that it is possible to prevent the screw rod from swinging forward, backward, leftward, and rightward with respect to the central axis, and it is possible to effectively prevent problems such as air loss and damage to the joint portion.

[Brief description of drawings]

FIG. 1 is a view showing an example of a screw rod applied to a joint portion structure according to the present invention.

2 is a plan view of the screw rod of FIG. 1. FIG.

FIG. 3 is a bottom view of the screw rod of FIG.

FIG. 4 is a diagram provided for explaining a connection state of screw rods.

FIG. 5 is a view showing a plug portion in the joint portion structure of the embodiment,
FIG. 3 is an exploded perspective view showing a packing and a socket portion.

FIG. 6 is a plan view (A) and a sectional view (B) of the packing in the joint structure of the embodiment.

FIG. 7 is a diagram showing another example of the screw rod.

FIG. 8 is a side view of a screw rod used for explaining a conventional joint structure.

FIG. 9 is a cross-sectional view for explaining a conventional joint structure.

[Explanation of symbols]

 50'-screw rod 54'-plug part 54a-columnar fitting part 54b-male lower brazing part 54f-male upper brazing part 55'-socket part 55a-cylindrical fitting part 55b-female upper bouncing part Wax 55f-female type lower wax

Claims (1)

[Claims] 1. A spiral blade is provided on the outer circumference,
The upper and lower end portions are respectively provided with a plug portion which constitutes a male joint and a female joint, and a socket portion into which the plug portion is fitted, and a fluid supply passage is provided so as to extend vertically through the plug portion, A joint part structure of a screw rod for an underground drilling machine, which is connected by inserting a socket part into a socket part or a plug part provided in a coupling partner with a packing interposed between the respective tip surfaces, In addition to the columnar fitting portion having a rectangular cross-section and the male lower splint portion having a circular cross-sectional outer shape having a larger diameter than that of the columnar fitting portion having a square cross section, It is equipped with a male upper sprue part that is smaller in diameter than the projecting part and has a circular cross-sectional outer shape.The male part of the plug part is fitted with the male lower sprue part of the plug part. In addition to the female upper anchor portion and the cylindrical fitting portion whose inner circumference into which the columnar fitting portion of the plug portion is fitted are rectangular in section, the male upper anchor portion of the plug portion is fitted. The structure of a screw rod joint for an underground drilling machine, which is characterized by having a female lower spigot.