JP2007046300A - Rod and coupling sleeve for drilling machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable the extension of a rod, sufficiently and surely prevent the rotation of the rod, and simply constitute a structure for extracting the rod from a leading end member, in a connecting structure of the rod for a drilling machine for drilling a hole in the ground etc. <P>SOLUTION: In the connecting structure of the rod 11 for the drilling machine, the rods are connected together in a length direction via male and female parts 13 and 22 screwed to each other. At least one engaging groove 14, which is elongated in the circumferential direction, perpendicular to the length direction, of the rod 11 for the drilling machine, and which is to be engaged with an insertion member 24 for being inserted from sleeve parts 21 and 21a with the female screw part 22 for being screwed to the male screw part 13, is formed in a position adjacent to the male screw part 13. An insertion hole 23 for inserting the insertion member 24 is formed in a position corresponding to the engaging groove 14 of the sleeve part. When the male screw part 13 is screwed into the male screw part 22, the insertion member 24 is inserted. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a drilling rod used in tunnel construction, foundation construction, reinforcement construction, and the like. The present invention relates to a drilling machine rod and a drilling machine coupling sleeve that can be used.

  The drilling rod is used in various ways depending on the construction method. One of them is to transmit the action of rotational force and striking force in one direction to a tip member such as a bit. In a drilling operation using such a rod for a drilling machine, it is necessary to add rods as the drilling operation proceeds, that is, as the drilling depth increases. The connecting structure that enables the rod to be added is generally performed via a rod or a screw formed on the rod and the coupling sleeve.

  That is, it connects via the external thread part formed so that it may tighten in the direction where a rotational force acts, and an internal thread part, and it drills to a desired depth.

  After the drilling, for example, as in the excavation tool described in Patent Document 1 below, the rod is collected, and for that purpose, the detachable connection structure between the tip of the rod and the tip member provided at the tip is provided. It is complicated.

  It is sufficient that the rod can be recovered only by rotating in the opposite direction to that during drilling. However, since the rod is added, the reverse rotational force applied to the rod on the rear side in the drilling direction is greater than that. It is not transmitted to the rod on the tip side.

In addition, after connecting with a screw, the structure which prevents rotation of a screw mutually is disclosed by the following patent document 2. FIG. This technique is based on the fact that “two pairs of shank rod-rod coupling couplings that engage with the male screw of the shank through the through-holes provided oppositely so as to squeeze and cross the screw hole. "With a set pin", even if the shank is engaged in the male thread valley of the shank and the shank rotates in the direction opposite to the drilling direction, the shank releases the screw connection from the female thread of the shank-rod coupling coupling. It has a function to prevent it from rotating. "
However, since the locking pin is locked in the valley of the male screw, the rotation prevention is mainly due to contact resistance, and a sufficient and reliable rotation prevention cannot be performed.

JP 2003-172089 A Japanese Patent No. 3272324

  Accordingly, the main object of the present invention is to enable the rods to be added and to prevent the rotation sufficiently and reliably, and to simplify the structure for extracting the rod from the tip member.

  The means for this is a connecting structure of a rod for a drilling machine that is connected in the longitudinal direction via a male screw part and a female screw part that are screwed together, and the drilling machine is located adjacent to the male screw part. One of the engaging grooves is formed to extend in a circumferential direction perpendicular to the longitudinal direction of the rod for use and to engage with an insertion member inserted from a sleeve portion having a female screw portion screwed into the male screw portion. In the sleeve portion, an insertion hole for inserting the insertion member is formed at a position corresponding to the engagement groove when the male screw portion and the female screw portion are screwed together, and the male screw portion and the female screw portion are threaded. It is the connection structure of the rod for hole drills in which the said insertion member is inserted at the time.

That is, when connecting, the addition of the drilling machine rod is constituted by, for example, a split pin or the like with respect to the insertion hole of the sleeve portion having the female screw portion after the male screw portion and the female screw portion are screwed together. Insert the plug. Then, the insertion member stays in the insertion hole of the sleeve portion, and an intermediate portion in the length direction of the insertion member engages with an engagement groove formed adjacent to the male screw portion. Since the engaging groove prevents movement in the front-rear direction, that is, the length direction of the rod for hole drilling machine, it can hold the screwed state by the male threaded part and the female threaded part that try to move in the front-rear direction when rotated. For this reason, it will be in the anti-rotation state in which the external thread part and the internal thread part do not rotate in any direction of advancement / retraction.
In order to separate the added hole drill rod, the hole drill rod may be sequentially rotated in the separating direction after the insertion member is taken out.

  Another means is a drilling machine rod having a male threaded portion for connection at the end in the lengthwise direction, extending in the circumferential direction perpendicular to the lengthwise direction of the drilling machine rod, The drilling machine rod is formed with at least one engagement groove formed adjacent to the male screw portion to be engaged with an insertion member inserted from a sleeve portion having a female screw portion to be screwed into the portion. In the rod for drilling machine, the male screw portion may be formed at one end portion in the length direction, or may be formed at both end portions in the length direction. In the case where it is formed at one end in the length direction, the sleeve portion is formed at the other end in the length direction.

That is, when connecting the drilling rod, as in the above, after adding the male screw part and the female screw part to each other, the male screw part and the female screw part are joined together, and then the sleeve part having the female screw part is inserted. For example, an insertion member composed of a split pin or the like is inserted into the hole. Then, the insertion member stays in the insertion hole of the sleeve portion, and an intermediate portion in the length direction of the insertion member engages with an engagement groove formed adjacent to the male screw portion. Since the engaging groove prevents movement in the front-rear direction, that is, the length direction of the rod for hole drilling machine, it can hold the screwed state by the male threaded part and the female threaded part that try to move in the front-rear direction when rotated. For this reason, it will be in the anti-rotation state in which the external thread part and the internal thread part do not rotate in any direction of advancement / retraction.
Similarly, in the case of separating the spliced drilling rod, the drilling rod may be sequentially rotated in the separating direction after the insertion member is taken out.

Here, about the said structure, it can comprise in the following aspects.
One of the embodiments is one in which the engagement groove is formed at a tip side portion from the male screw portion.
That is, when the engagement groove is formed at the rear end side portion from the male screw portion, the shape of the engagement groove portion and the corresponding sleeve portion is complicated because the male screw portion is positioned at the front end side in the screwing direction. However, in the case where the engagement groove is formed at the distal end side portion from the male screw portion, it can be formed simply by forming the insertion hole in the sleeve portion.

Another means is a coupling sleeve for a hole drilling machine having a female thread part into which the male thread part of the rod for hole drilling machine is screwed, and a position corresponding to the engagement groove when screwed with the male thread part. And a coupling sleeve for a drilling machine in which an insertion hole for inserting the insertion member is formed.
That is, when connecting the drilling rod using the coupling sleeve for the drilling machine, the extension of the drilling machine rod is connected by screwing the male screw part and the female screw part together as described above. Thereafter, an insertion member composed of, for example, a split pin is inserted into the insertion hole. Then, the insertion member stays in the insertion hole, and an intermediate portion in the length direction of the insertion member engages with an engagement groove formed adjacent to the male screw portion. Since the engaging groove prevents movement in the front-rear direction, that is, the length direction of the rod for hole drilling machine, it can hold the screwed state by the male threaded part and the female threaded part that try to move in the front-rear direction when rotated. For this reason, it will be in the anti-rotation state in which the external thread part and the internal thread part do not rotate in any direction of advancement / retraction.
Similarly, in the case of separating the spliced drilling rod, the drilling rod may be sequentially rotated in the separating direction after the insertion member is taken out.

  As described above, according to the present invention, the rod can be added, and the screwed state of the male screw portion and the female screw portion is securely held by the engagement of the insertion member and the engaging groove. The engagement groove does not use the valley of the external thread as in Patent Document 2, but is provided separately from the external thread of the external thread portion. Since the screw is not drawn like a screw, it can be reliably prevented from rotating in the forward and backward directions.

  For this reason, mutual rotation of the male screw portion and the female screw portion can be completely prevented. And the connection structure of the rod for drilling machines and the front-end | tip member attached to the tip can be simply comprised, such as the coupling | bonding by a screw, for example. If the structure is simple, it is easy to operate, and the effects of reducing costs can be obtained.

An embodiment for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is a cross-sectional view showing a connecting structure of a drilling machine rod 11 (hereinafter referred to as a rod). The rod 11 is connected via a coupling sleeve 21 and is used by being sequentially added as the drilling operation proceeds. In particular, it is preferably used for the drilling tool 31 as shown in FIG.

  The drilling tool 31 will be briefly described, and the connecting structure of the rod 11 will be described together.

  FIG. 2 is a cross-sectional view of the drilling tool 31 with the rod 11 removed. As shown in this figure, the drilling tool 31 includes the rod 11 that transmits power for drilling, the drill bit member 41 that is detachably attached to the tip of the rod 11, and performs the drilling. A casing pipe 51 which is positioned on the outer peripheral side of the rod 11 to prevent the hole wall drilled from collapsing, and a tip sleeve 61 which is provided at the tip of the casing pipe 51 and which is interposed between the drill bit member 41 and Have

  The drilling tool 31 has a structure in which drilling is performed by the rotational force and the striking force transmitted to the drilling bit 41 via the rod 11, and the tip sleeve 61 and the casing pipe 51 have their drilling operations. Intrudes into the drilling hole.

Each part will be described in turn.
The rod 11 is connected to the tip of a shank rod (not shown) in the main body hammer mechanism of the percussion machine. The rod 11a is connected to the drill bit member 41, and the tip rod 11a. There is an additional rod 11b (see FIG. 3) that is sequentially added to the rear of the rear. Both are cylindrical with a predetermined length, the axial center portion has a through-hole portion 12 penetrating in the length direction, and male screw portions 13 and 13 for connection are formed at both ends. . The screw of the male screw portion 13 is a left-hand screw. That is, the rotation in the direction in which the rotation to the left is tightened. The screw in the illustrated example is a taper screw.

  In the distal end rod 11a, one end portion on the side connected to the drill bit member 41 is formed only by the male screw portion 13, but the other end portion is added to the vicinity of the male screw 13 portion at both end portions of the rod 11b. As shown in FIG. 5, an engaging groove 14 is formed at the end of the male screw portion 13 together. Further, an end face portion 15 is formed in front of the fitting groove 14 so as to come into contact with another rod 11 facing when the coupling sleeve 21 is connected (see FIG. 1).

  That is, the engagement groove 14 extends in the circumferential direction perpendicular to the length direction of the rod 11 in a form having a U-shaped cross section at the tip of the male screw portion 13 formed over a predetermined length range. One is formed. The tip rod 11a, the extension rod 11b, and the extension rods 11b are connected by the cylindrical coupling sleeve 21 having a female screw portion 22 that is screwed into the male screw portion 13 over substantially the whole. As shown in FIGS. 4 and 5, a through hole 23 is formed at a position corresponding to the engagement groove 14 when the sleeve 21 is connected. Two through holes 23 are formed in parallel with respect to one engagement groove 14, that is, four coupling holes 21 are formed in total.

  The pins 24 are inserted into these through holes 23 after being connected by screwing (see FIGS. 5 and 6). Even if the rod 11 is removed from the coupling sleeve 21 due to the insertion of the pin 24, that is, in the right direction, the pin 24 inserted in the through hole 23 remains engaged with the engagement groove 14, Rotation in the right direction is prevented, and it is prevented from coming off. Note that a split pin is preferably used as the pin 24.

  The drill bit member 41 includes a substantially cylindrical main body member 42 to which the rod 11 is connected, and a bit member 43 that is integrally fixed to the end of the main body member 42. The main body member 42 has a female screw 42a into which the male screw 13 of the tip rod 11a is screwed at the rear end portion, and the tip portion is inserted into the bit member 43 and fixed in a non-rotatable state. A portion of the main body member 42 that protrudes from the bit member 43 is a fitting shaft portion 44.

  The bit member 43 has a diameter larger than that of the main body member 42, the tip portion is formed in an appropriate shape, and a chip 45 made of cemented carbide is fixed. The bit member 43 is formed with a central hole portion 46b that communicates with a central hole portion 46a formed in the axial center portion of the main body member 42, and a plurality of nozzle holes 46c are formed ahead of the central hole portion 46b. Is formed.

  Fluids such as air, water, and chemicals injected through the conduction hole 12 in the rod 11 or through other members pass through the central holes 46a and 46b and the injection hole 46c. For this reason, a check valve 47 is provided in the central hole portions 46a and 46b.

  In addition, a convex portion 48 is formed between the check valve 47 and the female screw 42a as a component of a fitting structure to which the tip sleeve 61 is attached in a relatively movable state. The relative movement is set so as to be appropriately performed in the length direction and the circumferential direction of the distal end sleeve 61. Further, a plurality of convex portions 48 are formed in the circumferential direction, for example, three, four, and the like.

  In this example, the convex portion 48 is formed of a rollable sphere 48a. Further, the sphere 48a can freely move in and out.

  That is, the sphere 48a is held in a holding hole 44a formed in the fitting shaft portion 44, and a short cylindrical support ring 48b housed so as to be positioned on the inner peripheral side of the holding hole 44a, and this And a spring 48c for biasing the support ring 48b so as to be positioned below the holding hole 44a. A tapered surface 48d is formed on the outer spring side of the outer peripheral surface of the support ring 48b. When the support ring 48b is displaced rearward from the position where the support ring 48b is displaced toward the tip side, the spherical body 48a is pressed toward the outer peripheral side. And is configured to move. In the drawing, reference numeral 49 denotes a stopper for restricting the position of the support ring 48b.

  It is the tip sleeve 61 that fits on the outer periphery of the fitting shaft portion 44. The tip sleeve 61 has a recess 62 at a portion corresponding to the sphere 48a on the inner peripheral surface. The concave portion 62 has a size having a buffering gap 62 a that allows the distal end sleeve 61 to move relative to the fitting shaft portion 44.

  Sealing members 63, 64 for sealing between the fitting shaft portion 44 are provided at two positions on the inner peripheral surface of the tip sleeve 61 that sandwich the concave portion 62 in the length direction.

  Further, at the distal end portion of the distal end sleeve 61, a meshing portion 43a formed at the rear end portion of the bit member 43 in the drill bit member 41 and a meshing portion 61a meshing so as to be relatively movable is formed.

  On the other hand, a connecting screw portion 61b for connection is formed at the rear end portion of the front end sleeve 61, and the casing pipe 51 is connected thereto.

  In order to fit the tip sleeve 61 to the fitting shaft portion 44, the support ring 48b is pushed toward the tip direction using an appropriate jig, and in this state, the tip portion of the tip sleeve 61 is moved to the fitting shaft. After being inserted into the portion 44, the pressing of the support ring 48b by the jig may be released. Then, the support ring 48b is displaced rearward along with the elastic return of the spring 48c, and the sphere 48a protrudes to the outer peripheral side. In other words, the sphere 48a fits in the recess 62 and enters a fitted state.

  The casing pipe 51 is made of a synthetic resin such as vinyl chloride and has a cylindrical shape with a predetermined length. A first screw portion 51a that is screwed into the connection screw portion 61b is formed at the front end, and a second screw portion (not shown) that can be screwed into the first screw portion 51a is formed at the rear end. In the formed structure, it is used by sequentially adding.

  Further, a plurality of injection holes 52 with check valves are formed in the casing pipe 51 at appropriate intervals in order to inject the medicine (see FIG. 7).

  In the drilling tool 31 configured as described above, when the counterclockwise rotational force and striking force are transmitted from the percussion machine to the drilling bit member 41 with the rod 11 connected to the drilling bit member 41, the drilling bit member 41 receives the rotational force and the striking force and cuts into the ground or rock.

  At this time, it is the tip sleeve 61 that is in contact with the drill bit member 41 that receives the rotational force and the striking force. The tip sleeve 61 is in contact with the fitting structure comprising the convex portion 48 and the concave portion 62. The seal members 63 and 64 are used. Since there is a gap 62 a (margin, play) between the convex portion 48 and the concave portion 62, vibration due to rotational force or striking force is mitigated, and the casing connected to the rear end portion of the distal end sleeve 61. The load on the pipe 51 can be reduced.

  Moreover, since the convex portion 48 can roll, the impact at the time of the collision between the convex portion 48 and the concave portion 62 can be alleviated, so that the load applied to the casing pipe 51 is further reduced.

  Further, since the distal end sleeve 51 is connected to the fitting shaft portion via the seal members 63 and 64, the distal end sleeve 61 does not rattle. In addition, mud or the like can be prevented from entering between the fitting shaft portion 44 and the tip sleeve 61, and the fitting structure for buffering can be protected.

  Further, after the completion of the work such as drilling, as shown in FIG. 2, the rod 11 is all united by applying a clockwise rotational force opposite to that at the time of drilling, that is, as shown in FIG. The distal end rod 11 a can be easily separated from the drill bit member 41. The removed rod 11 can be separated for each member by removing the pin 24 inserted into the through hole 23 of the coupling sleeve 21.

In the drilling tool 31 as described above, the chemical solution can be injected while drilling. That is, as shown in FIG. 7, first, a hole is drilled to a predetermined depth (a hole drilling process) while injecting air or water from the nozzle hole (a). Then, a desired chemical solution is ejected from the nozzle hole 46c (chemical solution injection step) (b). Alternatively, the hole drilling (drilling process) and the chemical liquid injection (chemical liquid injection process) are performed simultaneously.
Such operations are sequentially repeated to perform drilling and chemical injection to a predetermined depth (c).
Finally, the rod 11 is rotated to the right to recover the rod 11 and the coupling sleeve 21 (d).

  Alternatively, the chemical solution injection (chemical solution injection step) can be performed after drilling a hole with a predetermined depth (drilling step). That is, although not shown, first, a hole having a predetermined depth is formed while air or water is jetted from the nozzle hole. Next, the rod is rotated to the right to collect only the rod. Subsequently, the chemical solution for injecting the chemical solution by inserting the injection tube for injecting the chemical solution instead of the rod and injecting the chemical solution using the injection tube is ejected from the injection hole 52 with a check valve provided in the casing pipe 51.

  The rod 11 is connected as described above, and the drilling operation and the chemical injection operation are performed as in the above example.

  That is, the rod 11 can be added, and the threaded state of the male threaded portion 13 of the rod 11 and the female threaded portion 22 of the coupling sleeve 21 is securely held by the engagement of the pin 24 and the engaging groove 14. The engaging groove 14 is provided separately from the male screw of the male screw portion 13, and positively engages with unevenness in a direction to prevent rotation, and the direction of the engaging groove 14 also has the direction of the screw. Since the spiral is not drawn like this, the rotation in the advancing and retreating direction is surely made.

  For this reason, the mutual rotation of the external thread part 13 and the internal thread part 22 can be prevented completely.

  In addition, the rods 11 that are appropriately added and used are prevented from rotating together, and the detachable connection structure between the rod 11 and the drill bit member 41 is constituted by a screw (connection screw portion 42a). When collecting the rod 11, the rod 11 can be separated from the drilling bit member 41 by simply rotating the rod 11 in the right direction opposite to that at the time of drilling, and the operation is simple. In addition, since the structure is simple, the cost can be reduced by reducing the number of parts and the number of assembly steps.

  Hereinafter, other embodiments will be described. In addition, about the site | part which is the same as that of the said structure, or the equivalent, the code | symbol same as the said structure is attached | subjected and the detailed description is abbreviate | omitted.

  FIG. 8 shows an example in which the rod 11 has a plurality of engaging grooves 14. That is, the engaging groove 14 is formed at the tip of the rod 11 as in the above example, and another (second) engaging groove 14 is formed at a position separated from the engaging groove 14 by an appropriate distance rearward. is doing. In other words, the two male screw portions 13 are formed intermittently, and the second engagement groove 14 is formed between them. If a plurality of engagement grooves 14 are formed in this way and rotation is stopped by the pins 24 at each engagement groove 14 portion, the load applied to the pins 24 can be dispersed and the strength can be increased.

  FIG. 9 shows an example in which the screws constituting the male screw portion 13 and the female screw portion 22 are not high taper screws as in the above example but high lead screws.

  Similarly, FIG. 10 shows an example in which the screws constituting the male screw portion 13 and the female screw portion 22 are rope screws.

  FIG. 11 shows an example of a rod 11 that can be connected without using a coupling sleeve. That is, the rod 11 has the male screw portion 13 and the engaging groove 14 at one end in the length direction and the sleeve portion 21a, that is, the female screw portion 22 and the through hole 23 at the other end.

In the correspondence between the configuration of the present invention and the configuration of the one aspect described above,
The sleeve portion of the present invention corresponds to the coupling sleeve 21 and the sleeve portion 21a in the above embodiment,
Similarly,
The insertion member corresponds to the pin 24,
The insertion hole corresponds to the through hole 23,
The present invention is not limited to the configuration of the above-described one form.

  For example, the insertion hole may not be penetrated and only one of the insertion holes may be opened, and an appropriate member other than the split pin may be used as the insertion member. Further, the engagement groove 14 is not limited to being formed at the position adjacent to the distal end side of the male screw portion 13, and is formed between the male screw portions 13, for example, like the second engagement groove 14 shown in FIG. 8. It may be what is done. Furthermore, the number of the engagement grooves 14 is not limited to one or two, and may be three or four. The number of the through holes 23 corresponding to one engagement groove 14 is as described above. The number is not limited to two, and may be one, for example.

Sectional drawing which shows the connection structure of the rod for drilling machines. Sectional drawing of a drilling tool. The side view of the rod for drilling machines. The half sectional view of the coupling sleeve for hole drilling machines. Sectional drawing of the coupling sleeve for hole drilling machines. Sectional drawing which shows a rotation stop state. Explanatory drawing of an action state. Sectional drawing of the connection structure which concerns on another example. Sectional drawing of the connection structure which concerns on another example. Sectional drawing of the connection structure which concerns on another example. The half sectional view of the rod for drilling machines concerning other examples.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Rod for drilling machine 13 ... Male thread part 14 ... Fitting groove 15 ... End surface part 21 ... Coupling sleeve 21a ... Sleeve part 22 ... Female thread part 23 ... Through-hole 24 ... Pin

Claims (4)

It is a connecting structure of a rod for a drilling machine connected in the length direction via a male screw part and a female screw part that are screwed together,
Engage with an insertion member inserted from a sleeve portion having a female screw portion that extends in a circumferential direction perpendicular to the length direction of the rod for drilling hole and is adjacent to the male screw portion, and has a female screw portion that is screwed into the male screw portion. While at least one engaging groove is formed,
In the sleeve portion, an insertion hole for inserting the insertion member is formed at a position corresponding to the engagement groove when the male screw portion and the female screw portion are screwed together,
A connecting structure of a rod for a drilling machine into which the insertion member is inserted when the male screw portion and the female screw portion are screwed together. A rod for a drilling machine having a male threaded portion for connection at the end in the length direction,
An engagement groove that extends in a circumferential direction perpendicular to the length direction of the rod for drilling machine and that engages with a plug member inserted from a sleeve portion having a female screw portion that is screwed into the male screw portion is the male screw. A rod for a drilling machine, which is formed adjacent to the part and formed at least one. The connecting structure for a drilling machine rod or the drilling machine rod according to claim 1 or 2, wherein the engagement groove is formed in a tip side portion of the male screw portion. A coupling sleeve for a drilling machine having a female thread part into which the male thread part of the rod for drilling machine according to any one of claims 2 to 3 is screwed.
A coupling sleeve for a hole drilling machine, wherein an insertion hole for inserting the insertion member is formed at a position corresponding to the engagement groove when screwed with the male screw portion.

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