JP5773305B2 - Drilling device - Google Patents

Description

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

The down-the-hole method, using a down-the-hole hammer comprising comprises a hammer bid to built and distal compressed air actuated piston, a method of performing drilling by rotation and striking of the hammer bid. Then, in the drilling work by this down-the-hole method, excavated earth and sand generated by the drilling action by the hammer bid are made to the inner peripheral surface of the drilled hole and the down-the- hole by the air lift action of the compressed air ejected from the tip of the hammer bid. Through the annular gap between the hammer and the outer peripheral surface of the connecting rod connected to the hammer , it is moved upward from the bottom of the drilling hole and ejected from the opening end of the drilling hole to the ground.

By the way, in the drilling device that is used for drilling work by this down-the-hole method, (b) the run-out that regulates the run-out of the down-the- hole hammer from the viewpoint of obtaining a highly accurate drilling by ensuring the straightness of the drilling. It is required to have a stop function,
(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 that in a drilling device provided with a leader, a “ rest ” is attached to the lower end portion of the leader, and the auger screw and the down-the- hole hammer provided at the lower end are attached by this “ rest” . These core runouts are suppressed as much as possible by holding them up and down. 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 shape provided with the hole which a down-the-hole hammer penetrates, this "cover" is installed in the opening part of a hole, Surrounding the air and the excavated soil from the 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 open the peripheral wall It is intended to prevent dust from being scattered by discharging from the discharge port.

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 in the ceiling through which the down-the-hole hammer passes is covered with an elastic material, there is no idea about the steady-state function of the down-the- hole hammer , and it is provided on the outer peripheral surface of the “cover” In addition, since the discharge port is configured to open only 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, Toka secure drilling accuracy, from the viewpoint of preservation of the environment at the time of boring work, the three functions required for the drilling device using a down-the-hole hammer, i.e., a shake prevention function of down-the-hole hammer There has not yet been proposed a technique for simultaneously realizing a dust suppression function and a noise suppression function.

Therefore, the present invention provides a drilling device using a down-the-hole hammer , and realizes high-precision drilling work without damaging the surrounding environment by combining a steadying function, a noise suppression function, and a dust suppression function. It was made as a 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 down-the-hole hammer 4 provided with a hammer bid 5 at the tip is connected to an auger 1 supported so as to be able to move up and down, and drilling is performed by rotating and hammering the hammer bid 5. The apparatus includes a work support unit 10 fixedly installed on the ground at a drilling position in a state where the down-the-hole hammer 4 is vertically penetrated, and the work support unit 10 has a cylindrical shape and has a cylindrical shape. An outer peripheral wall 21 provided with a discharge port 26 at an appropriate position on the outer periphery and a ceiling wall 25 provided with a cylindrical wall 24 of a cylindrical body are provided at the substantially central position while covering the upper end side of the outer peripheral wall 21. It is composed of a unit main body 11 and a cylindrical body 12a inserted and arranged in the cylindrical wall 24 of the unit main body 11, and the down-the-hole hammer is provided on the inner peripheral side thereof. 4 is constituted by an adjustment adapter 12 is inserted, while allowing the down-the-hole hammer 4 is inserted so as to be relatively slidable in and axially in a non-rotating state with respect to the adjustment adapter 12, the unit the adjustment adapter 12 It is characterized in that it can be rotated relative to the main body 11 via a bearing 15. In the present invention, the cylindrical portion 12a of the adjustment adapter 12 and the down-the- hole hammer 4 inserted through the cylindrical portion 12a are configured to be rotatable relative to each other. Both of them are included in (1).

In the second invention of the present application, a down-the-hole hammer 4 provided with a hammer bid 5 at the tip is connected to an auger 1 supported so as to be able to move up and down, and a hole is drilled by the rotation and hammering action of the hammer bid 5. The apparatus includes a work support unit 10 fixedly installed on the ground at a drilling position in a state where the down-the-hole hammer 4 is vertically penetrated, and the work support unit 10 has a cylindrical shape and has a cylindrical shape. An outer peripheral wall 21 provided with a discharge port 26 at an appropriate position on the outer periphery and a ceiling wall 25 provided with a cylindrical wall 24 of a cylindrical body are provided at the substantially central position while covering the upper end side of the outer peripheral wall 21. It is composed of a unit main body 11 and a cylindrical body 12a inserted and arranged in the cylindrical wall 24 of the unit main body 11, and the down-the-hole hammer is provided on the inner peripheral side thereof. 4 is constituted by an adjustment adapter 12 to be inserted, provided with a plurality of adjustment ribs 12c extending toward the radial direction outside of the outer circumferential surface of the cylindrical body 12a of the adjusting adapter 12, of the adjusting rib 12c The extension dimension is set corresponding to the dimensional difference between the inner diameter of the cylindrical wall 24 of the unit main body 11 and the outer diameter of the cylindrical body 12a of the adjustment adapter 12.

In the third invention of the present application, a down-the-hole hammer 4 provided with a hammer bid 5 at the tip is connected to an auger 1 supported so as to be able to move up and down, and a hole is drilled by the rotation and hammering action of the hammer bid 5. The apparatus includes a work support unit 10 fixedly installed on the ground at a drilling position in a state where the down-the-hole hammer 4 is vertically penetrated, and the work support unit 10 has a cylindrical shape and has a cylindrical shape. An outer peripheral wall 21 provided with a discharge port 26 at an appropriate position on the outer periphery and a ceiling wall 25 provided with a cylindrical wall 24 of a cylindrical body are provided at the substantially central position while covering the upper end side of the outer peripheral wall 21. It is composed of a unit main body 11 and a cylindrical body 12a inserted and arranged in the cylindrical wall 24 of the unit main body 11, and the down-the-hole hammer is provided on the inner peripheral side thereof. 4 and an adjustment adapter 12 through which the down-the-hole hammer 4 is inserted into the adjustment adapter 12 so as to be non-rotatable and slidable in the axial direction. The main body 11 is configured to be rotatable relative to the main body 11 via a bearing 15, and includes a plurality of adjustment ribs 12c extending radially outward on the outer peripheral surface of the cylindrical body 12a of the adjustment adapter 12. The extension dimension of the adjustment rib 12c is set in accordance with a dimensional difference between the inner diameter of the cylindrical wall 24 of the unit main body 11 and the outer diameter of the cylindrical body 12a of the adjustment adapter 12. .

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 includes an inner peripheral surface of the cylinder 12a of the adjustment adapter 12 and the cylinder 12a. The shield 13 is made of an elastic material that closes an annular gap between the down-the-hole hammer 4 and the outer circumferential surface of the down-the-hole 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 the 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 formed 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 drilling device includes the work support unit 10 fixedly installed on the ground at the drilling position with the down-the-hole hammer 4 penetrating in the vertical direction, 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. The unit main body 11 is configured to include a ceiling wall 25 provided with a wall 24, and the cylinder 12a is inserted into the cylindrical wall 24 of the unit main body 11. Since it is configured with an adjustment adapter 12 through which the down-the- hole hammer 4 is inserted,
(A-1) The tubular body 12a of the adjustment adapter 12 through which the down-the- hole hammer 4 is inserted engages with the cylindrical wall 24 of the unit body 11 in the radial direction, whereby the radial direction of the down-the- hole hammer 4 For example, even when the hammer bid 5 hits a hard rock, the down-the- hole hammer 4 does not run out due to the rock excavation resistance, and the straightness in the drilling direction is ensured. And high-precision drilling work is realized (expression of steady rest function),
(A-2) The periphery of the open end on the ground side of the excavation hole formed by the drilling operation with the down-the-hole 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 main body 11 communicates with the outside through a discharge port 26 provided in the outer peripheral wall 21, an annular gap between the inner peripheral surface of the excavation hole and the outer peripheral surface of the down-the- hole hammer 4 is formed by drilling work. The excavated soil and air blown upward from the opening end of the excavation hole by the air lift action are not released to the outside as they are, but their free movement is restricted in the internal space 20, As a result, for example, compared to the case where excavated soil and air are released freely from the excavation hole, the generation and generation of dust from the excavated soil are reduced. 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.

(A-3) Further, since the down-the- hole hammer 4 is inserted into the adjustment adapter 12 in a non-rotating state and slidable in the axial direction, for example, the down-the-hole hammer 4 and the adjustment adapter Compared to a configuration in which 12 is relatively movable, the gap between the outer peripheral surface of the down-the- hole hammer 4 and the inner peripheral surface of the adjustment adapter 12 is made as small as possible so that the outside of the excavated soil from the gap Leakage into the water can be suppressed, and further improvement of the dust suppression function can be expected.

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 down-the-hole hammer 4. That is, when the down-the- hole hammer 4 provided with the ridges is configured to relatively rotate within the cylindrical portion 12a of the adjustment adapter 12, the inner diameter of the cylindrical portion 12a is a trajectory passing through at least the outer surface of the ridges. It is necessary to make it larger than the outer diameter of the circle. Therefore, a gap having a width larger than the protrusion height of the protrusion is generated in the portion where the protrusion is not provided, and the amount of external leakage of excavated soil from this large gap Will increase. However, when the down-the- hole 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 is set to the above-mentioned dimension. This is because the down-the-hole hammer 4 and the adjustment adapter 12 can be small enough to slide relative to each other in the axial direction.

(A-4) When the down-the- hole hammer 4 is rotationally driven by the auger 1, the adjustment adapter 12 also rotates integrally with the down-the- hole hammer 4 while being supported on the unit body 11 side. There is a concern that the rotational action of the down-the-hole hammer 4 and, consequently , 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 12 is configured to be relatively rotatable with respect to the unit main body 11 via the bearing 15, the concern concerned is eliminated and a good excavation action is ensured.

(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, 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 down- the-hole hammer 4 is different in size, particularly in diameter, depending on its drilling ability, the adjusting adapter 12 through which the down-the- hole hammer 4 is inserted is also in accordance with the size of the down-the- hole hammer 4 to which the down-the- hole hammer 4 is applied. It is necessary to vary the diameter of the cylindrical body 12a, and when the apparatus is operated, a plurality of types of adjustment adapters 12 having different diameters of the cylindrical body 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 down-the- hole 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 whether the adjustment rib 12c and the inner peripheral surface of the cylindrical wall 24 of the unit main body 11 are close to each other, and the two are engaged in the radial direction, the steady movement of the down-the-hole hammer 4 is ensured. Therefore, further improvement of the steady rest function can be expected.

(C) In the drilling device according to the third invention of the present application, the effects described in (a) and (b) above are obtained.

(D) In the drilling device according to the fourth invention of the present application, in addition to the effect described in the above (a), (b) or (c) , the following specific effect is obtained. That is, in this invention, the annular gap between the inner peripheral surface of the cylindrical body 12a of the adjustment adapter 12 and the outer peripheral surface of the down-the- hole hammer 4 inserted and disposed in the cylindrical body 12a is blocked in the adjustment adapter 12. Since the shielding member 13 made of an elastic material is provided, the annular gap can be closed without hindering the movement of the down-the- hole hammer 4, thereby preventing dust from being discharged from the annular gap to the outside. And higher dust suppression effect can be 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 leader 42 supported in a standing state at the tip of a support base 41, and includes an auger 1, a connecting rod 3 and a down-the-hole hammer 4 described below. Configured.

The auger 1 rotationally drives a down-the- hole hammer 4 to be described later, and is suspended and supported by a wire rope 44 on the side of the support base 41 and is supported by a guide rail 43 provided on the reader 42. It is driven up and down along the guide rail 43 by the hoisting / lowering operation 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 down-the- hole hammer 4 is connected to the lower end of the connecting rod 3. The down-the- hole hammer 4 has a well-known structure and incorporates a piston driven by compressed air, and has a hammer bid 5 at its tip.

Further, at the position of the outer peripheral surface of the down-the-hole hammer 4 in four equal positions in the circumferential direction, a ridge 6 made of a mold member having a rectangular cross-sectional shape extending in the axial direction of the down-the- hole hammer 4 is provided. The ridge 6 has the original function of maintaining the size of an annular gap between the inner peripheral surface of the excavation hole 34 sequentially drilled by the hammer bid 5 and the outer peripheral surface of the down-the- hole hammer 4. In this embodiment, the space for excavating soil by the air lift function is secured. In this embodiment, the down-the- hole hammer 4 functions as a relative rotation restricting material between the down-the- hole hammer 4 and an adjustment adapter 12 to be described later. Is given. Further, the protrusion 6 is provided not only on the down-the- hole 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 between the outer periphery of the down-the-hole hammer 4 and the inner surface of the excavated drill hole 34. Through the annular gap, it is sequentially transferred upward (to the upper end opening side of the excavation hole 34) and ejected onto the ground (see FIG. 2).

The connecting rod 3 is used in accordance with 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 down-the-hole hammer 4 is used for drilling. May be performed.

Incidentally, the viewpoint in such a drilling device Z, from the viewpoint of securing the drilling accuracy suppress deflection core of the da Unza hole hammer 4 "bracing function", to preserve the work site of the surrounding environment 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 makes a steadying action of the down-the- hole hammer 4 by abutting and engaging directly with a cylinder portion 12a (see FIG. 3) of the adjusting adapter 12 described later or via the adjusting rib 12c. It is.

  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 the dimension between the inner peripheral surface of the cylindrical wall 24 and the outer peripheral surface of the down-the- hole hammer 4 inserted and arranged therein. The difference is adjusted to realize the above three functions. The cylinder portion 12a has a predetermined diameter, the flange portion 12b provided at the upper end of the cylinder portion 12a, and the circumference of the outer peripheral surface of the cylinder portion 12a. It consists of adjustment ribs 12c provided at four positions in the 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 in the above, the adjusting adapter 12 receives the upward movement of the down-the- hole hammer 4 or the vertical vibration accompanying the hitting of the down-the- hole hammer 4, and the above-mentioned It is reliably prevented from coming out from the unit 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 down-the- hole hammer 4 is engaged with the engagement groove 18, and the protrusion 6 and the engagement groove 18 are engaged with each other in the rotation direction of the down-the- hole hammer 4. The relative rotation of the down-the-hole hammer 4 and the adjustment adapter 12 is restricted, and both 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 down-the- hole hammer 4, the inner diameter of the cylindrical portion 12 a and the groove depth of the engaging groove 18 are set to the outer diameter of the down-the- hole hammer 4 and the protrusion 6. It can set so that it may adjoin 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 down-the- hole 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 down-the- hole hammer 4 inserted and arranged here (that is, set so as to reduce the difference between the two dimensions). Accordingly, in accordance with the type of down- the- hole hammer 4 to be used, a plurality of types of the adjustment adapter 12 having different diameters of the cylindrical portion 12a are prepared. 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 down-the- hole hammer 4 having the largest diameter, the unit main body 11 corresponds to the down-the- hole hammer 4. It is preferable to prepare a cylindrical wall 24 having a diameter that can fit the adjustment adapter 12 selected.

In this case, the adjustment adapter 12 having the cylindrical portion 12a having a diameter corresponding to the diameter of the down-the- hole hammer 4 to be used is selected from among the various types of adjustment adapters 12 in the unit main body 11. Depending on the type of the adjustment adapter 12, 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 down-the-hole hammer 4 is inserted into the adjustment adapter 12 to perform a drilling operation. In such a case, the steadying function of the down-the- hole 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 down-the- hole hammer 4 and an external force is applied to the adjustment adapter 12, the external force is applied to the cylindrical wall 24. Thus, the unit main body 11 is supported by the whole, so that the “rest function” can be ensured.

“Shield 13”
In the state where the down the hole hammer 4 is inserted into the inner peripheral side of the adjustment adapter 12, the shield 13 is interposed between the inner peripheral surface of the cylindrical portion 12 a of the adjustment adapter 12 and the outer peripheral surface of the down the hole hammer 4. It is provided from the viewpoint of further narrowing the formed annular gap, and is formed, for example, in a disc shape with an elastic material having wear resistance such as reinforced rubber, and each of the protrusions of the down-the- hole hammer 4 at the inner peripheral edge thereof. An engagement groove 19 having a size capable of engaging the protrusion 6 is provided at a position corresponding to the stripe 6. 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 down the hole hammer 4 together with the adjustment adapter 12, and rotates together with the down the hole hammer 4. That is, it does not rotate relative to the down-the- hole hammer 4. Accordingly, the inner diameter in the shield 13 is set to be smaller by suitable dimensions than the outer diameter of the down-the-hole hammer 4, when the down-the-hole hammer 4 is inserted here, the inner peripheral edge portion of the shield 13 is elastically Even if it is pressed against the outer peripheral surface of the down-the- hole hammer 4 (in other words, there is no gap between the two as much as possible), for example, as in the case of a configuration in which both of them rotate relative to each other The problem that the inner peripheral edge of the shield 13 is worn away cannot occur, and as a result, the achievement of a high shielding effect by the shield 13 and the improvement of the durability of the shield 13 can be achieved at the same time. Become.

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 down-the- hole 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 leader 42 side (see FIG. (See the state of the dashed line 1). In this case, a specific adjustment adapter 12 is selected in advance according to the size of the down-the- hole hammer 4 to be used, and the selected adjustment adapter 12 attaches the connecting rod 3 and the down-the-hole hammer 4 to the auger 1. Before being connected, it is fitted and arranged at the lower end of the down-the- hole hammer 4 that is suspended and supported by the auger 1 in a single state, specifically, directly above the hammer bid 5.

In this case, the adjustment adapter 12 is disposed with a sufficient gap with respect to the down-the- hole hammer 4 portion, but the diameter of the hammer bid 5 is larger than the diameter of the down-the- hole hammer 4 in terms of its function. Is set. Therefore, even if lifting the down-the-hole hammer 4 in a state of mounting the adjustment adapter 12 to the down-the-hole hammer 4, the adjustment adapter 12 is held without coming out from the down-the-hole hammer 4 by the engagement between the hammer bid 5 .

Next, the down-the- hole hammer 4 is lowered together with the auger 1, and the down-the- hole 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 down-the- hole 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 the unit is formed on the upper end side of the cylindrical wall 24. By being mounted on the bearing 15 fixed on the ceiling wall 25 of the main body 11, it is set on the unit main body 11 side (see FIG. 2). In this set state, the gap between the outer periphery of the down-the- hole 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. . This completes the drilling preparation.

Then, start the auger 1 is rotated the down-the-hole hammer 4, by operating the piston of the down-the-hole hammer 4 by applying a striking force to the hammer bid 5, drilling of the ground by the hammer bid 5 Is done. In this boring work, but the down-the-hole hammer 4 is rotated, even if the adjustment adapter 12 rotates the down-the-hole hammer 4 integrally with the rotation of the down-the-hole hammer 4, the adjustment adapter 12 to the bearing 15 The rotary action on the down-the- hole hammer 4 side is absorbed by the side bearing 15 and inhibits the rotation of the down-the- hole hammer 4 between the adjustment adapter 12 and the unit main body 11. Such resistance action does not occur, and the drilling work by the down-the-hole hammer 4 is appropriately performed.

On the other hand, as shown in FIG. 2, the excavated soil generated in the drilling operation by the down-the-hole hammer 4 sequentially forms the inner peripheral surface of the excavation hole 34 and the down-the-hole 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 hammers 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 down-the- hole hammer 4 is inserted and the cylindrical wall 24 of the unit main body 11 are engaged in the radial direction, so that the down-the-hole hammer 4 in the radial direction is engaged. Since core runout is restricted, for example, even when the hammer bid 5 hits hard rock, the down-the- hole hammer 4 does not run out due to rock excavation resistance, ensuring straightness in the drilling direction. Thus, a highly accurate drilling operation 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 down-the- hole hammer 4. Dust is prevented from being released to the outside through the annular gap as much as possible, and a higher dust suppression effect is 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 absorption relaxation action of 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 ejected and deposited 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 · · Down-the-hole 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 .. Engaging groove 19 .. Engaging groove 20 .. Internal space 21 .. Outer peripheral wall 24 .. Cylindrical wall 25 .. Ceiling wall 26 Discharge port 28 ·· Flat wall portion 29 · · Sound absorbing material 30 · · Cover 31 · · Discharge passage 32 · · Rib 34 · · Excavation hole 35 · · Locking portion 41 · · Support base 42 · · Leader 43 · · Guide rail 44 ・ ・ Wire rope 51 ・ ・ Bracket 52 ・ ・ Bracket

Claims (6)

Drilling by connecting a down-the-hole hammer (4) having a hammer bid (5) at its tip to an auger (1) supported so as to be movable up and down, and drilling by rotating and hammering the hammer bid (5). A device,
The work support unit (10) is fixedly installed on the ground at the drilling position with the down-the-hole hammer (4) penetrating vertically, 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 cylindrical wall (24) of a cylindrical body is provided at a substantially central position thereof. A unit main body (11) configured with a ceiling wall (25) formed, and a cylindrical body (12a) inserted into the cylindrical wall (24) of the unit main body (11) and The inner peripheral side is composed of an adjustment adapter (12) through which the down-the-hole hammer (4) is inserted,
The down-the- hole hammer (4) is inserted into the adjustment adapter (12) in a non-rotating state and slidable in the axial direction, while the adjustment adapter (12) is inserted into the unit body (11). The hole drilling device is configured to be relatively rotatable via a bearing (15). Drilling by connecting a down-the-hole hammer (4) having a hammer bid (5) at its tip to an auger (1) supported so as to be movable up and down, and drilling by rotating and hammering the hammer bid (5). A device,
The work support unit (10) is fixedly installed on the ground at the drilling position with the down-the-hole hammer (4) penetrating vertically, 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 cylindrical wall (24) of a cylindrical body is provided at a substantially central position thereof. A unit main body (11) configured with a ceiling wall (25) formed, and a cylindrical body (12a) inserted into the cylindrical wall (24) of the unit main body (11) and The inner peripheral side is composed of an adjustment adapter (12) through which the down-the-hole hammer (4) is inserted,
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. Drilling by connecting a down-the-hole hammer (4) having a hammer bid (5) at its tip to an auger (1) supported so as to be movable up and down, and drilling by rotating and hammering the hammer bid (5). A device,
The work support unit (10) is fixedly installed on the ground at the drilling position with the down-the-hole hammer (4) penetrating vertically, 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 cylindrical wall (24) of a cylindrical body is provided at a substantially central position thereof. A unit main body (11) configured with a ceiling wall (25) formed, and a cylindrical body (12a) inserted into the cylindrical wall (24) of the unit main body (11) and The inner peripheral side is composed of an adjustment adapter (12) through which the down-the-hole hammer (4) is inserted,
The down-the-hole hammer (4) is inserted into the adjustment adapter (12) in a non-rotating state and slidable in the axial direction, while the adjustment adapter (12) is inserted into the unit body (11). And is configured to be rotatable relative to the bearing (15).
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 a space between an inner peripheral surface of the cylinder (12a) of the adjustment adapter (12) and an outer peripheral surface of the down-the- hole hammer (4) disposed through the cylinder (12a). A drilling device comprising a shield (13) made of an elastic material that closes the annular gap. 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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