JP6547196B2 - Drilling blade - Google Patents

Description

  The present invention relates to a drilling blade in which a drilling bit is detachably provided on a drilling blade.

  Excavators are used to excavate the ground in construction such as excavation and improvement of the ground. In this drilling apparatus, a cutting blade is provided at the tip of a rotating shaft connected to a drive source such as a motor. The drilling blade is provided with a drilling bit for drilling a ground on a drilling blade attached to a rotating shaft. Then, in the drilling device, the drilling blade is rotated with the rotation of the rotation shaft, and the ground is drilled with the drilling bit (see, for example, Patent Document 1).

  In the drilling blade provided in this drilling equipment, generally, one obtained by welding a drilling bit to a drilling blade (welded drilling blade) and the drilling bit on the drilling blade can be detached using a bolt and a nut There are those provided in (detachable drilling blade). Although the welding-type drilling blade is inexpensive, the welding-type drilling blade can be easily replaced because only the drilling bit can be easily replaced when the removable drilling blade needs to be replaced due to damage or wear of the drilling bit. The removable drilling blade has a cost advantage over the body.

Japanese Patent Laid-Open No. 2002-339680

  However, in the above-mentioned conventional detachable drilling blade, the friction of soil, stone, etc. which passes by digging is caused by the fact that the bolt and nut for fixing the drilling bit to the drilling blade project between the head and the bottom. The impact could cause the bolts and nuts to wear or break, making it impossible to remove the drilling bit from the drilling blade.

  In addition, in the ground improvement work using the solidified material, the solidified material etc. penetrates between the drilling blade body and the drilling bit or into the bolt and nut and solidifies, so that it may be removed even if it is hit with a hammer etc. As a result, there was a risk that the drilling bit could not be removed from the drilling blade.

Therefore, in the present invention according to claim 1, in the drilling blade in which the drilling bit is detachably provided to the drilling blade, the drilling bit is connected to the drilling blade and the holder via the holder, and the connecting portion The blade is formed on the front side of the blade, and a sealing material is provided between the drilling blade and the connection of the drilling bit, and the upper end of the blade protrudes above the upper surface of the connection and holder. It was decided to form a convex convex portion.

In the drilling blade according to the second aspect of the present invention, in the drilling blade in which the drilling bit is detachably provided to the drilling blade, the drilling bit is connected to the drilling blade and the holder via the holder, and the connecting portion A sealing material is provided on the head of a fastener that has a blade portion formed on the front side of the blade and that fastens the drilling blade and the connection portion of the drilling bit, and the upper surface of the blade portion It was decided to form a convex-shaped convex part which was made to project more upwards.

Further, in the present invention according to claim 3, in the present invention according to claim 2, the fastener is a hexagonal socket bolt, and the head is lower than the same position or the upper surface of the connection portion of the digging bit. It became a position and was decided to be fastened to the screw formed in the drilling blade.

In the present invention according to a fourth aspect , in the present invention according to any one of the first to third aspects, the cutting bit is formed by arranging two sharp edges of the cutting edge portion, and It was decided to form a groove between the tops of the sharp edges.

Further, in the present invention according to claim 5 , in the present invention according to claim 4 , the digging bit has a shape in which the pointed end of the pointed edge located on the outermost side of the digging blade is biased outward. It was to be.

  And, in the present invention, the following effects can be obtained.

  That is, in the present invention, in the case of the drilling blade in which the drilling bit is detachably provided to the drilling blade, since the sealing material is provided between the drilling blade and the drilling bit, the drilling blade and the drilling bit Since it is possible to prevent the intrusion of earth and sand, solidifying material, etc. between the two, it is possible to easily remove the drilling bit from the drilling blade body, and the replacement work of the drilling bit can be made easy.

Further, in the present invention, in the case of the drilling blade in which the drilling bit is detachably provided to the drilling blade, the sealant is provided at the head of the fastener for fastening the drilling blade and the drilling bit, It is possible to prevent the earth and sand, the solidified material, and the like from intruding into the gap between the fasteners, and the fasteners can be easily removed.
Since this also makes it possible to easily remove the drilling bit from the drilling blade, the replacement operation of the drilling bit can be facilitated.

  In particular, when the fastener is a hexagonal socket bolt and the head is at the same position as the upper surface of the digging bit or at a position lower than the upper surface, the head of the fastener is worn with soil, stone, etc. It is possible to prevent wear and tear. In addition, since the fastener is directly fastened to the screw formed on the drilling blade, it is possible to prevent the wear and wear of the bottom of the fastener. Furthermore, as an additional effect of the screw portion formed in the drilling blade, even if the solidified material etc. enters by the deterioration of the sealing material etc. and the fastener is fixed, along with the forced rotation operation by screw removal, Edge cutting of the secured part is performed to ensure that the fastener can be easily removed.

  In addition, when the upper end of the blade of the drilling bit is formed in a convex shape, the convex portion acts as a resistance, and earth, sand, etc. moving by digging directly contact the fastener and cause the head to be worn or worn. It can be prevented. Furthermore, when removing the drilling bit, the drilling bit can be easily removed from the drilling blade by striking the convex portion with a hammer or the like.

  Further, in the case where the blade portion of the drilling bit is formed by arranging two sharp edges together and forming a groove between the upper sides of the two sharp edges, the earth and sand excavated by the sharp edge is a groove Since it can be smoothly discharged in the upper direction between the two sharp edges through the above, it is possible to prevent a decrease in digging performance due to adhesion of earth and sand etc. between the sharp edges.

  Furthermore, among the drilling bits, the two sharp edges of the drilling bit located inside the drilling blade are formed in a double-edged shape, but the sharp edge of the sharp edge located at the outermost side of the drilling blade is a single-edged blade By making it the shape that is biased to the outside in the shape, it is possible to excavate reliably with the outermost part as the sharp edge part of the blade, and the wear of the side caused by contact of the earth and sand of the outermost part with the side of the drilling bit It also becomes possible to prevent

The side view showing a ground improvement device. The side view which shows a drilling rig. The same plan view. The top view which shows a drilling blade. The top view (a) which shows an excavation bit, the same right side view (b), the left side view (c), the same sectional view (d).

  Hereinafter, a specific configuration of the cutting blade according to the present invention will be described with reference to the drawings. In the following description, although the case where the drilling blade according to the present invention is applied to a drilling device of a ground improvement device is described, the present invention is not limited thereto, and the drilling blade according to the present invention is applied to other drilling devices can do.

  As shown in FIGS. 1 to 3, the ground improvement device 1 excavates the ground 2 and stirs and mixes the excavated soil with the ground improvement material (solidification material) to improve the strength and properties of the ground 2. It is In the ground improvement device 1, a support 4 is erected at the front end of the heavy machine 3, and the digging device 5 is attached to the support 4 so as to be able to move up and down. A ground improving material supply mechanism 6 is connected to the drilling device 5 via a swivel joint 7. The ground improvement material supply mechanism 6 connects the ground improvement material storage tank 8 and the water tank 9 to the ground improvement material mixing plant 10 and also connects the ground improvement material discharge pump 11 to the ground improvement material mixing plant 10 to improve the ground The material is configured to be supplied to the drilling device 5.

  The drilling device 5 has the elevating support 12 attached to the front side of the column 4 so as to be able to move up and down, the drive 13 is attached to the elevating support 12, and the base end of the digging shaft 14 extended in the vertical direction to the drive 13 The upper end portion is attached, and the rotary excavating portion 15 is attached to the tip end portion (lower end portion) of the excavating shaft 14. Here, the rotary drilling unit 15 performs drilling by rotation, and the ground improvement device 1 also has a function of performing stirring and mixing of the ground and the ground improvement material in addition to the drilling of the ground 2 ing.

  The drive body 13 connects the drive motor 18 to the inner shaft 16 and the outer shaft 17 that constitute the digging shaft 14 via the reverse transmission 19.

  The drilling shaft 14 is formed in a double tubular shape by a hollow cylindrical inner shaft 16 and an outer shaft 17 coaxially arranging a rotation center axis. The drilling shaft 14 projects the tip of the inner shaft 16 downward than the tip of the outer shaft 17. By driving the drive motor 18, the inner shaft 16 or the outer shaft 17 rotates relatively in the opposite direction by the action of the reversing transmission 19.

  The rotary digging unit 15 has the drilling blade 20 and the stirring blade 21 attached to the tip (lower end) of the drilling shaft 14 in order from the tip side.

  The drilling blade 20 has two flat plate-shaped drilling wings 22 radially attached outward at an interval of 180 degrees toward the circumferential direction on the tip outer peripheral surface of the inner shaft 16 and each drilling A plurality of digging bits 23 are detachably attached to the lower part of the wing 22 at intervals. The excavating blade body 20 rotates the excavating blade bodies 22 and 22 in accordance with the rotation of the inner shaft 16, and excavates the ground 2 with the excavating bit 23. The detailed configuration of the drilling blade 20 will be described later.

  The stirring blade 21 is configured by an innermost stirring blade 24, an inner stirring blade 25 disposed on the outer peripheral side thereof, and an outer stirring blade 26 further disposed on the outer peripheral side thereof.

  The innermost stirring blades 24 are attached radially outward at an interval of 180 degrees toward the circumferential direction of the two flat innermost stirring blades 27 on the outer peripheral surface of the tip of the outer shaft 17 ing.

  The inner stirring blades 25 are radially attached at the tip of the inner shaft 16 radially outward at a distance of 180 degrees in the circumferential direction. Each inner stirring blade body 28 has an inner stirring blade upper piece 29 extending in an inclined lower direction toward the outer lower part, an inner stirring blade middle piece 30 extending vertically in a downward direction, and an outer upper part With the inner stirring blade lower piece 31 extending in an inclined manner, the middle portion is formed in a substantially U-shape in a side view in which the middle portion is expanded outward. Each inner stirring blade body 28 mounts the inner stirring blade lower piece 31 on the tip end side of the inner shaft 16 and mounts the inner stirring blade upper piece 29 on the annular body 32 and the annular body 32 on the outer peripheral surface of the outer shaft 17 It is loosely fitted freely. Further, each inner stirring blade body 28 mounts the stirring pieces 33, 34, 35 on the upper portion of the inner stirring blade upper piece 29 and the inner portion and the outer portion of the inner stirring blade middle portion 30, and the inner stirring blade middle portion A connecting piece 36 is attached between the inner shaft 30 and the inner shaft 16.

  The outer stirring blades 26 are radially attached at the tip of the outer shaft 17 radially outward at intervals of 120 degrees in the circumferential direction. Each outer stirring blade body 37 has an outer stirring blade upper piece 38 extending obliquely downward toward the outer lower part, an outer stirring blade middle piece 39 extending vertically downward, and the outer upper part With the outer stirring blade lower piece 40 extending in an inclined manner, the middle portion is formed in a substantially U-shape in a side view in which the middle portion is expanded outward. Each outer stirring blade body 37 has the outer stirring blade upper piece 38 attached to the tip end side of the outer shaft 17 and the outer stirring blade lower piece 40 attached to the annular body 41 and the annular body 41 to the outer peripheral surface of the inner shaft 16 It is loosely fitted freely. Further, each outer stirring blade body 37 has the stirring pieces 42 and 43 attached to the lower portion of the outer stirring blade upper piece 38 and the inner portion of the outer stirring blade middle piece 39.

  The ground improvement device 1 is configured as described above. And the detail of the excavation blade 20 of the excavation apparatus 5 which becomes the principal part of this invention is comprised so that it may demonstrate below.

  As shown in FIG. 4, the drilling blade body 20 is provided with four drilling bits 23 (23 a to 23 d) detachably attached to the drilling wing body 22 with fasteners 44. As a result, the digging blade 20 can easily replace the digging bit 23 when damage, wear or the like of the digging bit 23 occurs. The drilling bit 23 may be provided directly on the drilling blade 22 or may be provided via a holder 45 attached to the drilling blade 22 as shown in FIG. 4. Here, the holder 45 forms an overhanging portion 45b for bringing the side surface of the drilling bit 23 into contact with the side portion of the holding portion 45a for holding the drilling bit 23, and excavates at the rear portion of the holding portion 45a. A step 45 c is formed to contact the rear surface of the bit 23.

  The digging bits 23a-23d all have the same configuration, but as described later, only the digging bit 23d located on the outermost side of the digging wing 22 has a cutting edge shape with the other inner digging bits 23a-23c. It is different.

  As shown in FIG. 5, the digging bit 23 has a connecting portion 46 straddled from the front side to the front end portion (the holding portion 45 a of the holder 45) of the digging wing 22, and a blade formed on the front side of the connecting portion 46. The part 47 is formed.

  The connecting portion 46 is provided with an upper piece 48 and a lower piece 49 sandwiching the front end portion (the holding portion 45a of the holder 45) of the excavating wing 22 and has a substantially U-shaped side cross-section. A stepped portion 50 is formed on each of the upper piece 48 and the lower piece 49. The upper piece 48 is formed with a stepped cylindrical through hole 51 for accommodating the head of a hexagonal socket bolt as the fastener 44. On the other hand, the lower piece 49 is formed with a screw portion 52 formed with a female screw for being screwed to a male screw of a hexagon socket headed bolt as the fastener 44. The through hole 51 of the upper piece 48 is such that the head of the fastener 44 is at the same position as the upper surface of the digging bit 23 (upper piece 48) or lower than the upper surface. The screw 52 may be a through hole or a closed hole. Further, through holes 53 for inserting the fasteners 44 are formed in the excavating wing 22 (the holder 45).

  The drilling bit 23 inserts the connecting portion 46 from the front side into the front end (the holding portion 45a of the holder 45) formed at the predetermined position of the drilling wing 22, and the front end (the holding portion 45a of the holder 45) And the lower piece 49, and in that state, the fastener 44 is inserted into the through holes 51, 52, 53 from the upper side of the upper piece 48, and the fastener 44 is screwed to the lower piece 49. It can be attached to the body 22. In addition, even if solidification material or the like infiltrates due to deterioration of the sealing material or the like and the fastener 44 is fixed by performing the reverse operation, a forced rotational operation is caused by the removal of the screw portion and is fixed. Edges of the beveled portion are made, the fasteners 44 can be easily removed, and the drilling bit 23 can be removed from the drilling wing 22.

  Here, the digging bit 23 is substantially coplanar to the left side of the connecting portion 46 (in the state where the digging bit 22 is mounted on the digging wing 22 (the inner side (abutment surface with the protruding portion 45 b of the holder 45)). And the right side surface of the connection portion (the outer side surface (the contact surface with the holding portion 45a of the holder 45 in a state where the drilling bit 23 is attached to the drilling blade 22) And the rear end face of the connection portion 46 (the rear end face of the upper piece 48 and the lower piece 49 (the contact surface with the step 45c of the holder 45)) Also, the rectangular flat sealing materials 56 to 59 are exchangeably attached. The sealing material 54 on the left side is provided on the upper end (outer end) of the upper piece 48 and the lower end (outer end) of the lower piece 49 so as to abut on the overhang 45b of the holder 45 The sealing material 55 is provided at the lower end (inner end) of the upper piece 48 and the upper end (inner end) of the lower piece 49 so as to abut on the holding portion 45 a of the holder 45. The sealing materials 54 to 59 may be formed by molding resin or the like into a predetermined shape, or may be coated or coated with resin or the like when the digging bit 23 is attached.

  As a result, all of the digging bits 23 are provided with the sealing materials 54 to 59 in a portion in contact with the digging wing 22 in a state of being mounted on the digging wing 22. As described above, by providing the sealing members 54 to 59 between the drilling blade 22 and the drilling bit 23, it is possible to prevent the intrusion of soil and earth at the time of ground excavation and an improvement material at the time of ground improvement.

  In addition, when the drilling bit 23 is attached to the drilling wing 22, the clearance between the through hole 51 of the upper piece 48 and the head of the fastener 44 and the through hole 53 of the lower piece 49 and the lower end of the fastener 44 The sealing materials 60 and 61 are provided in the gap between the two. The sealing materials 60 and 61 may be bonded with an O-ring or the like, or may be formed by molding a resin or the like into a predetermined shape, and the resin or the like is applied or filled after the digging bit 23 is attached. Alternatively, the front surface of the outer peripheral surface of the fastener 44 may be coated or filled with resin or the like. The sealing material 61 is necessary when the screw portion 52 provided in the lower piece 49 is a through hole, and is unnecessary in the case of a closed hole.

  As a result, in the state where the drill bit 23 is attached to the drill wing 22 by the fastener 44, the sealants 60 and 61 are all provided in the portion where the fastener 44 is exposed. As described above, by providing the sealing materials 60 and 61 at the portions where the fasteners 44 are exposed, it is possible to prevent the intrusion of soil and earth at the time of ground excavation and the improvement material at the time of ground improvement. It becomes easy to remove.

  The blade portion 47 of the drilling bit 23 is formed by arranging two sharp edges 62, 63 at the tip side by side, and forming a groove 64 between the upper sides of the two sharp edges 62, 63, and an upper portion at the upper end A convex-shaped convex portion 65 is formed to project above the upper surface of the piece 48.

  Here, as shown in FIG. 4, in the inside digging bits 23 a to 23 c, the two sharpened edges 62 and 63 having the same shape (the blade angle is the same) are formed, while the drilling blade 22 In the drill bit 23d located at the outermost position of the upper end, the tip end of the outer pointed edge 63 is formed to be biased outward from the center.

  As explained above, the drilling blade 20 provided in the drilling apparatus 1 has a configuration in which the sealing members 54 to 59 are provided between the drilling blade 22 and the drilling bit 23.

  Therefore, with the drilling blade 20 having the above configuration, it is possible to prevent the intrusion of soil, solidified material, etc. between the drilling blade 22 and the drilling bit 23, so the drilling bit 23 can be easily made from the drilling blade 22. The drilling bit 23 can be easily replaced.

  Further, the drilling blade 20 has a configuration in which a sealing material 60 is provided on the head of a fastener 44 for fastening the drilling blade 22 and the drilling bit 23.

  Therefore, in the drilling blade 20 of the above configuration, it is possible to prevent the earth, sand, solidified material, etc. from intruding into the fastener 44, so that the drilling bit 23 can be easily removed from the drilling wing 22 also by this. It is possible to make the replacement operation of the drilling bit easy.

  Further, in the cutting blade 20, a hexagonal socket bolt is used as the fastener 44, and the head thereof is at the same position as the upper surface of the cutting bit 23 or at a lower position than the upper surface, and formed on the cutting blade 22 (holder 45). It is configured to be fastened to the threaded portion.

  Therefore, in the drilling blade 20 having the above-described configuration, it is possible to prevent the head and the bottom of the fastener 44 from being worn or worn by soil, stone, or the like moving by drilling. Further, in order to fasten the fastener 44 directly to the screw formed on the drilling blade 22, even if a solidifying material or the like invades due to deterioration of the sealing material etc. and the fastener is firmly fixed, it is forced by screw removal As the rotary operation is performed, the edges of the fixed part are cut so that the fastener 44 can be easily removed.

  Further, the digging blade 20 has a configuration in which the upper end portion of the blade portion 47 of the digging bit 23 is formed in a convex shape.

  Therefore, in the digging blade 20 having the above-described configuration, the convex portion 65 acts as a resistance, and it is possible to prevent the soil or the like moving by digging from directly contacting the fastener 44 and causing wear and wear of the head. Furthermore, when removing the drilling bit 23, the drilling bit 23 can be easily removed from the drilling blade 22 by striking the projection 65 with a hammer or the like.

  Further, the drilling blade 20 has a configuration in which the blade portion 47 of the drilling bit 23 is formed by arranging two sharp edges 62 and 63 side by side, and a groove 64 is formed between the two sharp edges 62 and 63 above It has become.

  Therefore, in the excavating blade 20 having the above configuration, the earth and sand excavated by the sharp edges 62 and 63 smoothly pass through the groove 64 and pass between the two sharp edges 62 and 63 in the upper direction to be satisfactorily discharged. Therefore, it is possible to prevent the digging performance from being lowered due to the adhesion of earth and sand or the like between the pointed blades 62, 63.

  Further, the cutting blade 20 has a shape in which the tip end of the pointed edge 63 of the outer side of the drilling bit 23d located on the outermost side of the drilling blade 22 among the drilling bits 23a to 23d is biased outward. Configured.

  Therefore, with the drilling blade 20 of the above configuration, the outermost portion can be reliably drilled with the sharp edge portion of the blade, and the soil on the outermost portion contacts the side surface of the drilling bit, etc. Prevention is also possible.

Reference Signs List 1 ground improvement device 2 ground 3 heavy machinery 4 support 5 drilling device 6 ground improvement material supply mechanism 7 swivel joint 8 ground improvement material storage tank 9 water tank 10 ground improvement material mixing plant
11 ground improvement material discharge pump 12 elevation support
13 Driver 14 Drilling Axis
15 rotary drilling section 16 inner shaft
17 outer shaft 18 drive motor
19 reversing transmission 20 drilling blade
21 stirrer blade 22 drilling blade
23 drilling bit 24 innermost stirring blade
25 inner stirring blades 26 outer stirring blades
27 innermost stirring blade 28 inner stirring blade
29 Inner stirring blade upper piece 30 Inner stirring blade middle piece
31 inner stirring blade lower piece 32 annular body
33, 34, 35 Stirring pieces 36 Connection pieces
37 Outer stirrer blade 38 Outer stirrer blade upper piece
39 Outer stirring blade middle part 40 outer stirring blade lower piece
41 ring 42, 43 stirring pieces
44 Fasteners 45 Holders
45a holder 45b overhang
45c Step 46 Connection
47 blade 48 upper piece
49 lower piece 50 steps
51, 53 through holes 52 threads
54 to 61 Sealing material 62, 63 Sharp blade
64 groove 65 convex part

Claims (5)

In a drilling blade in which a drilling bit is detachably provided on a drilling blade,
The drilling bit has a connection portion connected with the drilling blade and the holder, and a blade portion formed on the front side of the connection portion,
Provide a seal between the drilling blade and the connection of the drilling bit,
An excavating blade body characterized in that an upper end portion of a blade portion is formed with a convex portion protruding upward from a connection portion and an upper surface of a holder . In a drilling blade in which a drilling bit is detachably provided on a drilling blade,
The drilling bit has a connection portion connected with the drilling blade and the holder, and a blade portion formed on the front side of the connection portion,
Provide a seal on the head of the fastener that fastens the drilling blade to the drill bit connection;
An excavating blade body characterized in that an upper end portion of a blade portion is formed with a convex portion protruding upward from a connection portion and an upper surface of a holder .   The fastener is a hexagonal socket bolt, and the head is at the same position as the upper surface of the connection portion of the drilling bit or lower than the upper surface, and is fastened to a screw formed in the drilling blade. The drilling blade according to item 2.   The drill bit according to any one of claims 1 to 3, wherein the cutting portion is formed by arranging two sharp edges side by side, and a groove is formed between the upper sides of the two sharp edges. Drilling blade. The digging blade according to claim 4, wherein the digging bit has a shape in which the tip end of the pointed blade located at the outermost side of the digging blade is biased outward.

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