JP2012112227A - Drilling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve highly accurate drilling work without damaging an ambient environment in a drilling device using a down-the-hole hammer.SOLUTION: On the ground surface of a drilling position, a unit body 11 including an outer peripheral wall 21 having a cylindrical shape body and provided with a discharge port 26 on the outer periphery and a ceiling wall 25 covering the upper end side of the outer peripheral wall 21 and provided with a cylindrical wall 24 on the almost center position and a work support unit 10 interpolated and arranged inside the cylindrical wall 24 and provided with an adjustment adapter 12 to which a down-the-hole hammer 4 is inserted and arranged are fixed and installed. By the configuration, the core deflection of the down-the-hole hammer 4 is regulated by the engagement in a radial direction of the adjustment adapter 12 and the cylindrical wall 24 and highly accurate drilling work is achieved. Also, scattering of dust from excavated soil is suppressed and noise generated accompanying the ejection of the excavated soil and air is suppressed as well.

Description

  The present invention relates to a drilling device used for drilling work by the down-the-hole method.

  The down-the-hole construction method is a construction method that uses a down-hole the hammer having a built-in compressed air actuated piston and having a hammer bid at the tip, and drills holes by rotating and striking the hammer bid. In the drilling work by this down-the-hole method, the excavated earth and sand generated by the drilling action by the hammer bid is lowered with the inner peripheral surface of the drilling hole by the air lift action of the compressed air ejected from the tip of the hammer bid. Through the annular gap between the hole the hammer and the outer peripheral surface of the connecting rod connected thereto, the hole is moved upward from the bottom side of the hole and ejected from the hole opening end to the ground.

By the way, in the drilling device used for drilling work by this down-the-hole method,
(B) From the viewpoint of ensuring high accuracy drilling by ensuring the straightness of the drilling hole, it is required to have a steadying function that regulates the runout of the downhole the hammer,
(B) From the viewpoint of maintenance of the surrounding environment during drilling work, a dust suppression function that suppresses scattering of dust from the excavated earth and sand ejected from the drilling hole to the ground side by air lift action,
(C) Similarly, from the viewpoint of preserving the surrounding environment during drilling work, it is also required to have a noise suppression function that suppresses the noise accompanying the discharge of excavated earth and sand to the surrounding environment.

  For example, Patent Document 1 discloses a technique related to the steadying function described in (A) above, and Patent Document 2 further discloses a technique related to the dust suppression function described in (B) above. In No. 3, the technology relating to the noise suppression function described in (c) above is proposed.

  Japanese Patent Laid-Open No. 2004-183312   JP 2003-556271 A   JP 2010-43404 A

  However, what is shown in Patent Document 1 is a drilling device equipped with a leader, in which a “rest” is attached to the lower end portion of the leader, and the auger screw and the downhole z The hammer is held so as to be movable up and down so as to suppress these runouts as much as possible. However, the “rest” shown in this Patent Document 1 merely exhibits the steady function and cannot achieve other functions.

  Moreover, what is shown by patent document 2 comprises "cover" with the cylinder of a ceiling obstruction-like cylinder provided with the hole which a downhole the hammer penetrates, and installs this "cover" in the opening part of a drilling hole, Surrounding the air and excavated soil from the drilling side to the ground surface with the above “cover”, and by blowing out air mixed with water from the peripheral wall side, the direction of the excavated soil is changed to the peripheral wall It is intended to prevent dust from being scattered by discharging from the opening.

  However, this disclosed technique suppresses generation of dust by moistening excavated soil with water mixed in the blast air, and there is a problem that mixing of water is an essential requirement and the structure becomes complicated. Also, considering that the hole part of the ceiling through which the downhole the hammer passes is covered with an elastic material, there is no idea about the steadying function of the downhole the hammer here, Since the discharge port provided on the outer peripheral surface simply opens to the side, it is considered that the function of suppressing noise caused by the ejection of excavated soil into the “cover” is extremely low. .

  The technology disclosed in Patent Document 3 suppresses noise associated with the drilling action by properly using water jet drilling and bit drilling depending on whether the ground to be drilled is soft or hard. . However, from the viewpoint of preserving the surrounding environment of the drilling site, rather than the noise associated with drilling, the noise when excavated soil erupts from the top of the drilling hole to the ground side becomes a problem. No effective proposal has been made.

  As described above, from the viewpoint of ensuring the accuracy of drilling and preserving the surrounding environment during drilling operations, three functions required for a drilling device using a downhole the hammer, that is, the downhole the hammer No technology has yet been proposed to simultaneously realize the steady rest function, the dust suppression function, and the noise suppression function.

  Therefore, the present invention achieves highly accurate drilling work without damaging the surrounding environment by combining a steadying function, a noise suppression function, and a dust suppression function in a drilling apparatus using a downhole the hammer. It was made for the purpose.

  In the present invention, the following configuration is adopted as a specific means for solving such a problem.

  In the first invention of the present application, a downhole the hammer 4 having a hammer bid 5 at its tip is connected to an auger 1 supported so as to be able to be lifted and lowered, and a hole is drilled by the rotation and striking action of the hammer bid 5. The drilling device includes a work support unit 10 fixedly installed on the ground at the drilling position in a state where the downhole the hammer 4 is vertically penetrated, and the work support unit 10 has a cylindrical shape. And an outer peripheral wall 21 provided with a discharge port 26 at an appropriate position on the outer periphery thereof, and an upper end side of the outer peripheral wall 21 and a ceiling wall 25 provided with a cylindrical wall 24 of a cylindrical body at a substantially central position thereof. Unit body 11 and a cylindrical body 12a inserted and disposed in the cylindrical wall 24 of the unit body 11, and the downhole the hammer 4 is characterized in that is constituted by an adjustment adapter 12 to be inserted. In the present invention, the cylindrical portion 12a of the adjustment adapter 12 and the downhole the hammer 4 inserted through the cylindrical portion 12a are configured to be rotatable relative to each other. Both of those configured as non-rotating) are included.

  According to a second invention of the present application, in the drilling device according to the first invention, the downhole the hammer 4 is inserted into the adjustment adapter 12 so as to be non-rotatable and relatively slidable in the axial direction. On the other hand, the adjustment adapter 12 is configured to be rotatable relative to the unit main body 11 via a bearing 15.

  In the third invention of the present application, in the drilling device according to the first or second invention, a plurality of adjustment ribs extending outward in the radial direction on the outer peripheral surface of the cylindrical body 12a of the adjustment adapter 12. 12c, and the extension dimension of the adjustment rib 12c is set corresponding to the dimensional difference between the inner diameter of the cylindrical wall 24 of the unit body 11 and the outer diameter of the cylindrical body 12a of the adjustment adapter 12. It is characterized by that.

  According to a fourth invention of the present application, in the drilling device according to the first, second or third invention, the adjustment adapter 12 is provided with an inner peripheral surface of the cylinder 12a of the adjustment adapter 12 and the cylinder 12a. It is characterized by comprising a shield 13 made of an elastic material that closes an annular gap between the downhole hammer 4 and the outer peripheral surface of the downhole hammer 4.

According to a fifth invention of the present application, in the drilling device according to the first, second, third, or fourth invention, at least one of the outer peripheral wall 21 and the ceiling wall 25 of the unit body 11 is connected to two. A heavy wall structure is used, and the sound absorbing material 29 is filled inside the wall.
In a sixth invention of the present application, in the hole drilling device according to the first, second, third, fourth or fifth invention, the discharge port 26 is provided on the outer peripheral wall 21 of the unit body 11 from the outside. A cover 30 is provided, and a discharge path 31 is formed between the cover 30 and the outer peripheral wall 21, which communicates with the discharge port 26 and opens downward below the lower end of the discharge port 26. It is a feature.

(A) According to the drilling device according to the first invention of the present application, the work support unit 10 is provided which is fixedly installed on the ground at the drilling position in a state where the downhole the hammer 4 is vertically penetrated. In addition, the work support unit 10 has a cylindrical shape and covers an outer peripheral wall 21 provided with a discharge port 26 at an appropriate position on the outer periphery thereof and an upper end side of the outer peripheral wall 21 and a cylindrical shape at a substantially central position thereof. The unit main body 11 is provided with a ceiling wall 25 provided with a cylindrical wall 24, and the cylindrical body 12a is inserted into the cylindrical wall 24 of the unit main body 11 and is provided on the inner peripheral side thereof. Since it is configured with the adjustment adapter 12 through which the downhole the hammer 4 is inserted,
(A-1) The downhole the hammer is formed by engaging the cylindrical body 12a of the adjustment adapter 12 through which the downhole the hammer 4 is inserted with the cylindrical wall 24 of the unit body 11 in the radial direction. 4, even if the hammer bid 5 hits a hard rock, the downhole the hammer 4 does not run out due to the excavation resistance of the rock. Straightness in the direction is ensured, and high-precision drilling work is realized (expression of the steady rest function).
(A-2) The periphery of the opening end on the ground side of the excavation hole formed by the drilling operation with the downhole the hammer 4 is surrounded by the unit main body 11 and the adjustment adapter 12 of the operation support unit 10; Since the internal space 20 of the unit main body 11 communicates with the outside via a discharge port 26 provided in the outer peripheral wall 21, the inner peripheral surface of the excavation hole and the outer peripheral surface of the downhole the hammer 4 are formed by drilling work. The excavated soil and air blown upward from the opening end of the excavation hole by the air lift action through the annular gap between them is not released to the outside as it is, and its free movement is restricted in the internal space 20, As a result, for example, compared to a case where excavated soil and air are freely released from the excavated hole, generation of dust from the excavated soil is increased. Scattering to the surroundings is suppressed (expression of dust suppression function), and noise generated due to the excavation of soil and air is suppressed as much as possible by the reflection attenuation action in the internal space 20 (noise). Expression of inhibitory function),
Etc. are obtained.

  (B) In the hole drilling apparatus according to the second invention of the present application, in addition to the effect described in the above (a), the following specific effect is obtained. That is, in the present invention, the downhole the hammer 4 is inserted into the adjustment adapter 12 in a non-rotating state and slidable in the axial direction. Compared to the configuration in which the adjustment adapter 12 is relatively movable, the gap between the outer peripheral surface of the downhole hammer 4 and the inner peripheral surface of the adjustment adapter 12 is made as small as possible from the gap. It is possible to suppress the leakage of the excavated soil to the outside, and further improve the dust suppression function.

  Such an effect becomes prominent particularly when a protrusion (see a member denoted by reference numeral 6 in FIG. 2) extending in the axial direction is provided on the outer peripheral surface of the downhole the hammer 4. That is, when the downhole the hammer 4 provided with the ridge is configured to relatively rotate within the cylinder portion 12a of the adjustment adapter 12, the inner diameter of the cylinder portion 12a is set to at least the outer surface of the ridge. It is necessary to make it larger than the outer diameter of the trajectory circle passing therethrough. Therefore, a gap having a width larger than the protruding height of the protrusion is generated in the portion where the protrusion is not provided, and the outside of the excavated soil from the large gap is generated. The amount of leakage will increase. However, when the downhole the hammer 4 is not rotated with respect to the adjustment adapter 12 as in the present invention, it is not necessary to secure a gap corresponding to the protruding height of the ridge, and the gap dimension. This is because the downhole the hammer 4 and the adjusting adapter 12 can be made small enough to slide relative to each other in the axial direction.

  When the downhole the hammer 4 is driven to rotate by the auger 1, the adjustment adapter 12 also rotates integrally with the downhole the hammer 4 while being supported on the unit body 11 side. Although there is a concern that the rotational action of the downhole the hammer 4 and thus the drilling action may be hindered by the rotational resistance caused by the friction between the adjustment adapter 12 and the unit main body 11, Since the adapter 12 is configured to be relatively rotatable with respect to the unit main body 11 via the bearing 15, the concern is eliminated and a good excavation action is ensured.

  (C) In the drilling device according to the third invention of the present application, in addition to the effect described in the above (a) or (b), the following specific effect is obtained. That is, in the present invention, a plurality of adjustment ribs 12c extending radially outward are provided on the outer peripheral surface of the cylindrical body 12a of the adjustment adapter 12, and the extension dimension of the adjustment rib 12c is set to the unit body. 11 is set corresponding to a dimensional difference between the inner diameter of the cylindrical wall 24 of the cylinder 11 and the outer diameter of the cylindrical body 12a of the adjustment adapter 12.

  Since the downhole the hammer 4 is different in size, particularly in diameter, according to its drilling ability, the adjustment adapter 12 through which the downhole the hammer 4 is inserted is also applied to the downhole the hammer 4 to which the downhole the hammer 4 is applied. It is necessary to vary the diameter of the cylinder 12a in accordance with the size of the cylinder. When operating the apparatus, a plurality of types of adjustment adapters 12 having different diameters of the cylinder 12a are prepared. However, for example, when the inner diameter of the cylindrical wall 24 of the unit body 11 is the same, the inner peripheral surface of the cylindrical wall 24 of the unit body 11 and the cylindrical body of the adjustment adapter 12 depending on the type of the adjustment adapter 12 to be used. A large dimensional difference may occur between the outer peripheral surface of 12a, and in such a case, the steadying function for the downhole hammer 4 cannot be exhibited.

  In such a case, as in the present invention, the adjustment rib 12c is provided on the outer peripheral surface of the cylindrical body 12a of the adjustment adapter 12, and the extension dimension of the adjustment rib 12c is set to the cylindrical wall 24 of the unit body 11. Regardless of the type of the adjustment adapter 12 to be used (ie, the size of the diameter of the cylinder portion 12a) is set by corresponding to the dimensional difference between the inner diameter and the outer diameter of the cylinder 12a of the adjustment adapter 12. Regardless of the above, the adjustment rib 12c and the inner peripheral surface of the cylindrical wall 24 of the unit main body 11 are in close proximity to each other, and both of them engage in the radial direction, thereby preventing the downhole the hammer 4 from swinging. Therefore, further improvement of the steady rest function can be expected.

  (D) In the drilling device according to the fourth invention of the present application, in addition to the effects described in (a), (b) or (c), the following specific effects are obtained. That is, in this invention, the annular gap between the inner peripheral surface of the cylinder 12a of the adjustment adapter 12 and the outer peripheral surface of the downhole hammer 4 inserted and disposed in the cylinder 12a is provided in the adjustment adapter 12. Since the shield 13 made of an elastic material is provided, the annular gap can be closed without hindering the movement of the downhole the hammer 4, whereby dust is discharged from the annular gap to the outside. And a higher dust suppression effect is obtained.

  (E) In the drilling device according to the fifth invention of the present application, in addition to the effects described in (a), (b), (c) or (d), the following specific effects can be obtained. . That is, in the present invention, at least one of the outer peripheral wall 21 and the ceiling wall 25 of the unit body 11 has a double wall structure, and a sound absorbing material 29 is filled in the wall. Here, there are noise due to air propagation and noise due to steel propagation, as noise accompanying excavation of soil and air, among these, air propagation noise is due to reflection attenuation in the internal space 20. In addition to being suppressed, the internal space 20 is configured to face the outside only through the discharge port 26, and is also suppressed by a small amount of air propagation leaking to the outside through the discharge port 26.

  In addition, the propagation noise in steel is noise generated by vibrations propagating in steel (that is, the inside of the steel constituting the wall of the unit body 11) and released into the air. Since at least one of the outer peripheral wall 21 and the ceiling wall 25 has a double wall structure and the sound absorbing material 29 is filled inside the wall, for example, vibration energy input to the inner wall of the double wall (that is, The vibration energy associated with the excavation soil and the air jet) propagates in the thickness direction in the inner wall and is transmitted to the sound absorbing material 29 side, and the vibration energy is attenuated at the boundary between the inner wall and the sound absorbing material 29. Thereafter, the vibration energy is further absorbed and relaxed in the sound absorbing material 29. A similar damping action also occurs when vibration is propagated from the sound absorbing material 29 to the outer wall side of the double wall, and also when propagating from the outer wall of the double wall to the outside air. This suppresses the propagation noise in steel as much as possible. As described above, since both the air propagation noise and the steel propagation noise are suppressed, a drilling device having a high noise suppression effect can be provided.

  (F) In the drilling device according to the sixth invention of the present application, in addition to the effects described in the above (a), (b), (c), (d) or (e), An effect is obtained. That is, in the present invention, a cover 30 is provided on the outer peripheral wall 21 of the unit main body 11 so as to cover the discharge port 26 from the outside, and communicates with the discharge port 26 between the cover 30 and the outer peripheral wall 21. Since the discharge path 31 opening downward is formed below the lower end of the discharge port 26, the excavated soil and air discharged from the discharge port 26 to the outside are always open at the lower end of the discharge path 31. The kinetic energy is attenuated by colliding with the excavated soil that has been ejected downward from the ground, and has been ejected to the ground or deposited earlier, and the scattering of the excavated soil and dust generated from the excavated soil to the surroundings is reduced. Suppressed as much as possible. Further, air propagation noise is also emitted downward from the discharge path 31, and diffusion and release to the surrounding environment is suppressed as much as possible.

  It is a side view which shows the whole structure and usage condition of the drilling apparatus which concerns on embodiment of this invention. It is.   It is explanatory drawing of the drilling operation state by the drilling apparatus shown in FIG.   FIG. 3 is an exploded perspective view of the work support unit shown in FIG. 2.   It is a partial cross section side view of a unit main body.   It is a VV arrow line view of FIG.   It is a side view which shows the 1st fixing method of the work assistance unit in the case of not providing a reader.   It is a side view which shows the 2nd fixing method of the said work assistance unit.

  Hereinafter, the present invention will be specifically described based on preferred embodiments.

I: Configuration of the Drilling Device Z FIG. 1 shows a drilling device Z according to an embodiment of the present invention. This drilling device Z is used by being attached to a reader 42 supported in a standing state at the tip of a support base 41. The auger 1, the connecting rod 3, and the downhole the hammer 4 described below. It is configured with.

  The auger 1 rotationally drives a downhole the hammer 4 which will be described later. The auger 1 is suspended and supported by a wire rope 44 on the side of the support base 41 and is hung on a guide rail 43 provided on the reader 42. The wire rope 44 is driven up and down along the guide rail 43 by the hoisting and lowering operations of the wire rope 44.

  A connecting rod 3 is connected to the lower end side of the auger 1 via a swivel joint 2, and a downhole the hammer 4 is connected to the lower end of the connecting rod 3. The downhole the hammer 4 has a well-known structure and has a built-in piston driven by compressed air, and a hammer bid 5 at the tip thereof.

  In addition, a ridge 6 made of a mold having a rectangular cross-sectional shape extending in the axial direction of the downhole the hammer 4 is provided at a position of the outer circumference of the downhole the hammer 4 in four equal positions. ing. The protrusion 6 has an essential function in that the size of the annular gap between the inner peripheral surface of the excavation hole 34 sequentially drilled with the hammer bid 5 and the outer peripheral surface of the downhole the hammer 4. In this embodiment, the downhole the hammer 4 and an adjustment adapter 12 (described later) into which the downhole the hammer 4 is inserted are provided. It functions as a relative rotation restricting material. Further, the protrusion 6 is provided not only on the downhole the hammer 4 but also on the outer peripheral surface of the connecting rod 3 connected thereto.

  Then, the hammer bid 5 is rotated by the auger 1 and drilling is performed by applying a striking force by the piston. Further, the excavated soil generated by the drilling of the hammer bid 5 is caused by the air lift action by the pressurized air ejected from the hammer bid 5 to the outer periphery of the downhole the hammer 4 and the inner surface of the excavated drilling hole 34. Are sequentially transferred upward (on the upper end opening side of the excavation hole 34) and ejected onto the ground (see FIG. 2).

  The connecting rod 3 is used according to the drilling depth, and usually a plurality of connecting rods 3 are used. However, in some cases, the connecting rod 3 is not used and only the downhole the hammer 4 is used for cutting. In some cases, drilling is performed.

  By the way, in such a drilling device Z, from the viewpoint of ensuring the drilling accuracy, the “rest function” that suppresses the runout of the downhole the hammer 4 preserves the surrounding environment of the work site. As described above, it is necessary to have a “dust control function” that suppresses the scattering of dust to the surroundings and a “noise control function” that suppresses the release of noise to the surroundings. Is provided with the following work support unit 10 in order to realize these three required functions with a simple configuration. Hereinafter, the configuration and the like of the work support unit 10 will be described in detail.

II: Configuration of Work Support Unit 10 The work support unit 10 forms the gist of the present invention, and includes a unit main body 11, an adjustment adapter 12, and a shield 13 described below.

"Unit body 11"
As shown in FIGS. 2 to 5, the unit main body 11 closes an outer peripheral wall 21 in which one side of a cylindrical body having a predetermined diameter is a flat-slip-shaped flat wall portion 28 and an upper end of the outer peripheral wall 21. The interior of the ceiling wall 25 is an interior space 20 that opens to the lower surface side.

  The outer peripheral wall 21 has a double wall structure composed of an outer wall surface 21a and an inner wall surface 21b that are spaced apart from each other at a predetermined interval, and a sound-absorbing material such as a foamed resin material is provided in the space between the wall surfaces 21a and 21b. The sound absorbing material 29 made of is filled.

  The flat wall portion 28 is provided with locking portions 35 at four locations, top, bottom, left, and right, and the unit main body 11 is configured such that each locking portion 35 is hooked on the guide rail 43 of the reader 42. In addition to being able to move up and down along the guide rail 43, movement in a plane direction perpendicular to the axis is restricted.

  Three positions in the circumferential direction of the outer peripheral wall 21, as shown in FIG. 5 in this embodiment, a position facing the flat wall portion 28, and two positions rotated approximately 90 degrees in the left-right direction from the flat wall portion 28, respectively. In addition, a discharge port 26 is provided. The discharge port 26 is a substantially vertically long rectangular opening cut out downward (in the axial direction) from the vicinity of the upper end of the outer peripheral wall 21. Further, a cover 30 is provided at a portion where the discharge port 26 is formed on the outer surface side of the outer peripheral wall 21 so as to cover the discharge port 26, and the cover 30 and the outer surface of the outer peripheral wall 21 are provided. A discharge path 31 communicating with the discharge port 26 is formed between them. The lower end of the discharge path 31 is opened toward the bottom at a height position lower than the lower end of the discharge port 26. The number of the outlets 26 is set as necessary.

  Similar to the outer peripheral wall 21, the ceiling wall 25 has a double wall structure including an outer wall surface 25a and an inner wall surface 25b, and a sound absorbing material 29 is filled in the space between the wall surfaces 25a and 25b. . A cylindrical wall 24 having a predetermined diameter is provided at the center position of the ceiling wall 25. This cylindrical wall 24 abuts and engages directly with a cylinder portion 12a (see FIG. 3) of the adjustment adapter 12 (described later) or via the adjustment rib 12c, thereby preventing the downhole the hammer 4 from swinging. It is something to do.

  A bearing 15 made of a thrust ball bearing is fastened and fixed to the ceiling wall 25 so as to surround the outside of the ceiling wall 25. The lower casing of the bearing 15 is fixed to the ceiling wall 25, but the upper casing is free, and a flange portion 12b of the adjustment adapter 12 described below is placed thereon (see FIG. 2). ).

"Adjustment adapter 12"
The adjustment adapter 12 is inserted and arranged in the cylindrical wall 24 of the unit main body 11, and between the inner peripheral surface of the cylindrical wall 24 and the outer peripheral surface of the downhole the hammer 4 inserted and arranged here. The above three functions are realized by adjusting the dimensional difference between the cylinder portion 12a having a predetermined diameter, the flange portion 12b provided at the upper end of the cylinder portion 12a, and the outer peripheral surface of the cylinder portion 12a. The adjustment ribs 12c are provided at four positions in the circumferential direction. As shown in FIG. 2, the adjustment adapter 12 has its cylindrical portion 12 a side fitted into the cylindrical wall 24 of the unit main body 11 from above, and the flange portion 12 b is connected to the ceiling wall 25 of the unit main body 11. It is used in a state of being placed on the upper surface of the bearing 15 provided on the upper surface (the upper surface of the upper casing).

  When the adjustment adapter 12 is mounted on the bearing 15, as shown in FIG. 2, the bracket 51 provided on the outer peripheral edge of the bearing 15 and the outer peripheral edge of the flange portion 12 b of the adjustment adapter 12. By inserting the retaining pin 16 between the brackets 52 provided on the bottom, the adjusting adapter 12 can move up and down the downhole the hammer 4 or move up and down as the downhole the hammer 4 strikes. Accordingly, it is reliably prevented from coming out from the unit main body 11 side, and the reliability of the drilling device in the drilling operation is improved.

  In addition, an engagement groove 18 extending in the axial direction from the upper surface of the cylindrical portion 12a to the lower end surface of the flange portion 12b is provided at a circumferentially equally divided position on the inner peripheral surface of the adjustment adapter 12. . The protrusion 6 provided on the downhole the hammer 4 is engaged with the engagement groove 18, and the protrusion 6 and the engagement groove 18 are engaged in the rotation direction of the downhole the hammer 4. Thus, the relative rotation of the downhole the hammer 4 and the adjustment adapter 12 is restricted, and both of them are assembled so as to be capable of relative sliding in the axial direction while maintaining the non-rotating state. Since the adjustment adapter 12 does not rotate relative to the downhole the hammer 4, the inner diameter of the cylindrical portion 12 a and the groove depth of the engagement groove 18 are set to the outer diameter of the downhole the hammer 4 and The protrusion 6 can be set so as to be close to the tip position. That is, the gap dimension between the inner peripheral side of the adjustment adapter 12 and the outer peripheral side of the downhole hammer 4 can be made smaller.

  By the way, the technical significance of the adjustment rib 12c provided on the outer surface of the cylindrical portion 12a of the adjustment adapter 12 is as follows. That is, the diameter dimension of the cylindrical portion 12a of the adjustment adapter 12 is set corresponding to the diameter dimension of the downhole the hammer 4 inserted and disposed here (that is, the difference in dimension between the two is reduced). Accordingly, a plurality of types of the adjustment adapter 12 having different diameters of the cylindrical portion 12a are prepared corresponding to the type of the downhole the hammer 4 to be used. On the other hand, the unit main body 11 is large and it is not economical to prepare many types of the unit main body 11. Therefore, for example, when using the downhole the hammer 4 having the maximum diameter, the downhole the hammer is used. It is preferable to prepare a cylindrical wall 24 having a diametric dimension in which the adjustment adapter 12 selected corresponding to 4 can be inserted.

  In this case, the adjustment adapter 12 having a cylindrical portion 12a having a diameter corresponding to the diameter of the downhole hammer 4 to be used is selected from the various types of adjustment adapters 12 in the unit main body 11. Depending on the type of the adjustment adapter 12 that has been formed, a large dimensional difference occurs between the outer diameter of the cylindrical portion 12 a and the inner diameter of the cylindrical wall 24, and the downhole the hammer 4 is inserted into the adjustment adapter 12 for cutting. When performing the hole work, the steadying function of the downhole the hammer 4 cannot be exhibited.

  Therefore, the adjustment rib 12c is provided on the outer peripheral surface of the cylindrical portion 12a of the adjustment adapter 12, and a plurality of types of adjustment adapters 12 having different width directions of the adjustment rib 12c are prepared. In this way, even if any type of adjustment adapter 12 is selected from among the various types of adjustment adapters 12, that is, between the outer diameter of the cylindrical portion 12a and the inner diameter of the cylindrical wall 24 is large. Even if there is a dimensional difference, the dimensional difference is absorbed by the adjustment rib 12 c, and the tip end portion of the adjustment rib 12 c always faces and opposes the inner peripheral surface of the cylindrical wall 24. Accordingly, when the cylindrical wall 24 and the adjustment rib 12c of the adjustment adapter 12 are engaged due to the runout of the downhole the hammer 4 and an external force is applied to the adjustment adapter 12, the external force is applied to the cylinder. The whole unit body 11 is supported through the wall 24, so that the "rest function" can be ensured.

“Shield 13”
In the state where the downhole the hammer 4 is inserted through the inner peripheral side of the adjustment adapter 12, the shield 13 has an inner peripheral surface of the cylindrical portion 12 a of the adjustment adapter 12 and an outer peripheral surface of the downhole the hammer 4. Is formed from the viewpoint of further narrowing the annular gap formed between the two, and is formed into a disk shape with an elastic material having wear resistance such as reinforced rubber, and the downhole An engagement groove 19 having a size capable of engaging the protrusion 6 is provided at a position corresponding to the protrusion 6 of the hammer 4. The shield 13 is bolted to the flange portion 12 b of the adjustment adapter 12.

  Further, since the shield 13 is fastened and fixed to the adjustment adapter 12, it is engaged with the downhole the hammer 4 together with the adjustment adapter 12 in a non-rotating manner. It rotates integrally, that is, it does not rotate relative to the downhole hammer 4. Accordingly, the inner diameter of the shield 13 is set to be appropriately smaller than the outer diameter of the downhole the hammer 4, and when the downhole the hammer 4 is inserted into the shield 13, Even if the peripheral portion is elastically pressed against the outer peripheral surface of the downhole the hammer 4 (in other words, with no gap between them as much as possible), for example, both of them rotate relative to each other. As in the case of the configuration, the problem that the inner peripheral edge of the shield 13 wears out cannot occur, and as a result, a high shielding effect by the shield 13 is realized and the durability of the shield 13 is improved. Can be compatible.

III: State of use of the drilling device Z and its operational effects In the drilling operation using the drilling device Z, the support base 41 is installed in the vicinity of the drilling position as shown in FIG. Only the unit main body 11 of the work support unit 10 supported by the reader 42 is placed on the ground so as to cover the drilling position, and its axis, that is, the axis of the cylindrical wall 24 is the drilling axis. Position and install so as to match as much as possible. In this installed state, the unit main body 11 is supported on the reader 42 side and its movement in the plane direction is restricted.

  On the other hand, the connecting rod 3 and the downhole the hammer 4 are connected via the swivel joint 2 to the auger 1 suspended by the wire rope 44 and supported so as to be movable up and down on the reader 42 side. (See the chain line shown in FIG. 1). In this case, a specific adjustment adapter 12 is selected according to the size of the downhole hammer 4 to be used, and the selected adjustment adapter 12 is connected to the auger 1 with the connecting rod 3 and the downhole. Before connecting the hammer 4, it is inserted and placed at the lower end of the downhole the hammer 4 that is suspended and supported by the auger 1 in a single state, specifically, directly above the hammer bid 5. Yes.

  In this case, the adjustment adapter 12 is disposed with a sufficient gap with respect to the downhole the hammer 4 portion, but the diameter of the hammer bid 5 is functionally the diameter of the downhole the hammer 4. It is set larger than the dimension. Therefore, even if the downhole the hammer 4 is lifted with the adjustment adapter 12 mounted on the downhole the hammer 4, the adjustment adapter 12 is disengaged from the downhole the hammer 4 by the engagement with the hammer bid 5. It is held without getting out.

  Next, the downhole the hammer 4 is lowered together with the auger 1, and the downhole the hammer 4 is inserted into the cylindrical wall 24 of the unit body 11 from the hammer bid 5 side at the tip. In this case, as the downhole the hammer 4 enters the unit main body 11, the adjustment adapter 12 also enters the cylindrical wall 24 from the cylindrical portion 12 a side, and on the upper end side of the cylindrical wall 24. It is set on the unit body 11 side by being placed on the bearing 15 fixed on the ceiling wall 25 of the unit body 11 (see FIG. 2). In this set state, the gap between the outer periphery of the downhole hammer 4 and the inner periphery of the cylindrical portion 12a of the adjustment adapter 12 is closed as much as possible by the shield 13 provided on the adjustment adapter 12. ing. This completes the drilling preparation.

  Next, the auger 1 is activated to rotate the downhole the hammer 4 and the piston of the downhole the hammer 4 is operated to apply a striking force to the hammer bid 5. Ground drilling is performed. In the drilling operation, the downhole the hammer 4 rotates. Even if the adjustment adapter 12 rotates integrally with the downhole the hammer 4 by the rotation of the downhole the hammer 4, the adjustment adapter 12 12 is supported by the unit main body 11 via the bearing 15, and the rotating action on the downhole the hammer 4 side is absorbed by the side bearing 15, and the above-mentioned between the adjustment adapter 12 and the unit main body 11. A resistance action that inhibits the rotation of the downhole the hammer 4 does not occur, and the drilling operation by the downhole the hammer 4 is performed properly.

  On the other hand, as shown in FIG. 2, the excavated soil generated in the drilling operation by the downhole the hammer 4 is sequentially performed with the inner peripheral surface of the excavated hole 34 by the air lift action of the air ejected from the tip of the hammer bid 5. It moves to the ground side through an annular gap between the outer peripheral surfaces of the downhole the hammer 4 and is jetted into the internal space 20 of the unit body 11 from the opening end of the excavation hole 34 together with air. Then, as shown by an arrow A, the excavated soil and air ejected into the internal space 20 move from the discharge ports 26 provided in the unit main body 11 to the discharge path 31 side, and the discharge path 31. It is discharged toward the ground side from the lower end.

  In this case, the cylindrical body 12a of the adjustment adapter 12 through which the downhole the hammer 4 is inserted and the cylindrical wall 24 of the unit main body 11 are engaged in the radial direction so that the downhole the hammer 4 Since the core runout in the radial direction is restricted, for example, even when the hammer bid 5 hits a hard rock mass, the downhole the hammer 4 does not run out due to the excavation resistance of the rock mass. Straightness in the direction is ensured, and highly accurate drilling work is realized.

  Moreover, since the free movement of the excavated soil and air that is ejected into the internal space 20 is restricted in the internal space 20 and is discharged to the outside from the discharge port 26, for example, excavated soil and air As compared with the case where the blast is released freely from the excavation hole, the scattering of the dust from the excavation soil is suppressed, and the noise generated with the excavation of the excavation soil and air is also reflected and attenuated in the internal space 20. Suppressed by action.

  Furthermore, in this embodiment, since the adjustment adapter 12 includes the shield 13, the annular gap can be closed as much as possible without hindering the movement of the downhole the hammer 4. Therefore, it is possible to prevent dust from being discharged from the annular gap as much as possible, and a higher dust suppression effect can be obtained.

  On the other hand, the following effects can be obtained with respect to the noise suppression function. That is, in this embodiment, both the outer peripheral wall 21 and the ceiling wall 25 of the unit main body 11 have a double wall structure, and the inside of the wall is filled with a sound absorbing material 29. Among the accompanying noise, air propagation noise is suppressed by the reflection attenuation action in the internal space 20, and the internal space 20 faces the outside only through the discharge port 26. The amount of air propagation leaking to the outside through 26 is also suppressed.

  Further, the propagation noise in steel is caused by the damping effect of the vibration energy when passing through the outer wall 21a and the inner wall 21b of the outer peripheral wall 21 and each boundary of the sound absorbing material 29 filled therebetween, and the sound absorbing material. 29 is suppressed by the action of absorbing and absorbing vibration energy.

  As described above, since both the air propagation noise and the steel propagation noise are suppressed, a drilling device having a high noise suppression effect can be provided.

  Furthermore, in this embodiment, the outer peripheral wall 21 of the unit main body 11 is provided with a cover 30 that covers the discharge port 26 from the outside, and communicates with the discharge port 26 between the cover 30 and the outer peripheral wall 21. In addition, since the discharge path 31 that opens downward is formed below the lower end of the discharge port 26, the excavated soil and air discharged from the discharge port 26 to the outside are always open at the lower end of the discharge path 31. The kinetic energy is attenuated by colliding with the excavated soil that has been ejected downward from the part, hitting the ground, or having been ejected and accumulated earlier, and the excavated soil or dust generated from the excavated soil is scattered around Is suppressed as much as possible. Further, air propagation noise is also emitted downward from the discharge path 31, and diffusion and release to the surrounding environment is suppressed as much as possible.

Others (1) In the above-described embodiment, the unit main body 11 of the work support unit 10 has been described as an integral configuration. However, the present invention is not limited to such a configuration. A two-part structure of the mold can also be configured.

(2) In the above embodiment, the work support unit 10 is fixedly installed by hooking the work support unit 10 on the guide rail 43 provided on the reader 42. However, in the actual drilling work site, the leader 42 may not be provided, and the drilling device Z may be suspended and supported by a crane to perform the drilling work. Therefore, a technique for fixedly installing the work support unit 10 under such circumstances is necessary, and a specific example is shown here.

  In the first specific example, as shown in FIG. 6, a support member 53 is attached as an attachment to a soil discharge plate 52 provided in a construction machine 51 such as a backhoe, and the above-mentioned work support unit 10 is attached to the support member 53. By securing the locking portion 35, the work support unit 10 can be fixedly installed.

  In the second specific example, as shown in FIG. 7, first, a temporary pile 56 such as H-shaped steel is driven by a vibro 55 in the vicinity of the drilling position. After that, the work support unit 10 is fixedly installed at a predetermined drilling position by hooking the engaging portion 35 on the work support unit 10 side to the guide rail material 57 provided on the temporary pile 56. is there.

1. · Auger 2 · · Swivel joint 3 · · Connecting rod 4 · · Downhole the hammer 5 · · Hammer bid 6 · · Projection 10 · · Work support unit 11 · · Unit body 12 · · Adjustment adapter 13 · · Shield 15 .. Bearing 16 .. Detachment pin 17 .. Fixing bolt 18 .. Engagement groove 19 .. Engagement groove 20 .. Inner space 21 .. Outer peripheral wall 24 .. Cylindrical wall 25. .. discharge port 28 .. flat wall part 29 .. sound absorbing material 30 .. cover 31 .. discharge path 32 .. rib 34 .. excavation hole 35 .. locking part 41 .. support base 42. · · Guide rail 44 · · Wire rope 51 · · Bracket 52 · · Bracket

Claims (6)

A downhole the hammer (4) having a hammer bid (5) at the tip is connected to an auger (1) supported so as to be capable of being driven up and down, and drilling is performed by the rotation and impact action of the hammer bid (5). A drilling device,
A work support unit (10) that is fixedly installed on the ground at the drilling position in a state where the downhole the hammer (4) is vertically penetrated,
The work support unit (10) covers the outer peripheral wall (21) having a cylindrical shape and provided with a discharge port (26) at an appropriate position on the outer periphery thereof, and the upper end side of the outer peripheral wall (21). A unit main body (11) having a ceiling wall (25) provided with a cylindrical wall (24) having a cylindrical shape at the center position, and an inner portion of the unit main body (11) inside the cylindrical wall (24). A drilling device comprising a cylindrical body (12a) to be inserted and arranged and an adjustment adapter (12) through which the downhole the hammer (4) is inserted on the inner peripheral side thereof. In claim 1,
While the downhole the hammer (4) is inserted into the adjustment adapter (12) in a non-rotating state and slidable in the axial direction,
The drilling device according to claim 1, wherein the adjustment adapter (12) is configured to be rotatable relative to the unit body (11) via a bearing (15). In claim 1 or 2,
The adjustment adapter (12) includes a plurality of adjustment ribs (12c) extending outward in the radial direction on the outer peripheral surface of the cylindrical body (12a), and the extension dimension of the adjustment rib (12c) is set as described above. Drilling holes set according to the dimensional difference between the inner diameter of the cylindrical wall (24) of the unit body (11) and the outer diameter of the cylindrical body (12a) of the adjustment adapter (12) apparatus. In claim 1, 2 or 3,
The adjustment adapter (12) includes an inner peripheral surface of the cylindrical body (12a) of the adjustment adapter (12) and an outer peripheral surface of the downhole the hammer (4) disposed through the cylindrical body (12a). A drilling device comprising a shield (13) made of an elastic material that closes an annular gap between the two. In claim 1, 2, 3 or 4,
At least one of the outer peripheral wall (21) and the ceiling wall (25) of the unit body (11) has a double wall structure, and the wall is filled with a sound absorbing material (29). A hole drilling device. In claim 1, 2, 3, 4 or 5,
The outer peripheral wall (21) of the unit body (11) is provided with a cover (30) that covers the discharge port (26) from the outside, and between the cover (30) and the outer peripheral wall (21). A drilling device characterized in that a discharge passage (31) communicating with the discharge port (26) and opening downward on the lower side of the lower end of the discharge port (26) is formed.

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