JP4195592B2 - Cutting device for anchor fixing unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
This invention is intended to fix anchor bolts and other anchor bodies in an object to be fixed such as existing concrete, and after drilling a cylindrical cylindrical hole, in at least a part of the depth direction in the cylindrical hole, The present invention relates to a cutting device for anchor body fixing part that forms a cavity having a relatively larger cross-sectional area than the cross-sectional area on the surface side.
[0002]
[Prior art and problems to be solved by the invention]
For example, non-structural members such as braces and other structural members such as pillars, beams, walls, foundations, etc. of existing structures, and similar soil cement consolidated bodies and other fixed parts, and wall panels, etc. When adding structural members, equipment members, or other members, drill holes for anchors such as anchor bolts to fix those members on the surface layer of existing concrete, etc., and anchor to the holes It is necessary to insert and fix the body.
[0003]
Generally, use a core tube, core drill, etc. as in JP-A-9-209457, JP-A-10-196048, JP-A-2000-352294, etc. It is removed in a columnar shape, and the anchor body is inserted into the hole in the removed portion, and the anchor body is fixed to the existing concrete by filling with a filler such as mortar, concrete, or adhesive. The ends are connected.
[0004]
When the member connected to the anchor body is a seismic element that bears a load higher than its own weight during an earthquake, the compressive force from the seismic element is transmitted to the existing concrete as supporting pressure from the bottom of the anchorage, but from the seismic element Since only the adhesion force between the filler filled in the removal portion and the inner peripheral surface of the removal portion can be expected as the resistance force, the resistance force is not sufficient.
[0005]
In order to increase the resistance to tensile force, it is necessary to increase the depth and diameter of the removal part or increase the number of removal parts. However, either method will expand the range of the removal part, In the case of reinforced concrete or steel-framed reinforced concrete, the possibility of damaging the reinforcing bars due to collision with the reinforcing bars in the concrete increases, so the reliability of the existing concrete after anchoring the anchor body decreases and It may be necessary.
[0006]
In view of the above background, the present invention proposes a cutting apparatus that enables drilling of fixing holes that can be expected to have high resistance to tensile force and the like acting on newly added seismic elements and other members.
[0007]
[Means for Solving the Problems]
In the present invention, a cutting device is constituted by a base fixed to the surface of an object to be fixed such as existing concrete or soil cement consolidated body, and a widening bit supported by the base and rotated around a drive shaft and having a cutting blade. Then, after drilling a cylindrical cylindrical hole on the surface layer side of the body to be fixed, while rotating the drive shaft, it is moved from the center of the cylindrical hole, and the widening bit is rotated to rotate the concrete around the cylindrical hole. By cutting the object to be fixed, a cavity having a cross-sectional area relatively larger than the cross-sectional area on the surface side is formed in at least a part of the depth direction in the cylindrical hole, and the range of the removal portion of the object to be fixed The resistance force against the pulling force acting on the anchor body is increased without enlarging.
[0008]
The widening bit is inserted into the previously drilled cylindrical hole, and the drive shaft connected to the widening bit rotates while moving in either direction from the center of the cylindrical hole. The side wall portion is cut toward the outer peripheral side, and a cavity having a relatively larger cross-sectional area than the surface-side cross-sectional area is formed in at least a part of the depth direction in the cylindrical hole.
[0009]
The outer diameter of the widening bit, including the cutting blade, does not collide with the hole at the beginning of drilling in the section deeper than the cylindrical hole and the hole wall of the cylindrical hole. In order not to be obstructed, it is set to be equal to or smaller than the diameter of the cylindrical hole.
[0010]
The cross-sectional area of the cavity refers to the area of the cross section perpendicular to the axis of the anchor body, and the cavity is stepped in at least a part of the depth direction in the cylindrical hole, for example, from the surface side to the back side. In addition to a shape in which the cross-sectional area of the entire cavity is gradually or gradually expanding toward the back side, a section having a small cross-sectional area and a section having a large cross-sectional area are formed. However, it is sufficient that the cross-sectional area of the section on the back side is relatively larger than the cross-sectional area of the section on the surface side.
[0011]
In the formation of the cavity, for example, when the entire cylindrical hole including the cavity is divided into two sections of the cylindrical surface side and the deep side in the depth direction, a part of the cylindrical hole drilled in advance the interval between the surface side of the section, the drive shaft Te its rear side smell relates center of the cylindrical hole, the shape formed by moving at least one side of the one direction is the simplest form.
[0012]
In this case, the drive shaft moves to at least one side while rotating, so that an elliptical section including a circular cross section of the surface side section in the section on the back side of the cylindrical hole B as shown in FIGS. 7- (a) and (b). A columnar hole is formed as a cavity C. If the drive shaft reciprocates in one direction, an elliptical cylindrical hole is formed symmetrically with respect to the center of the cylindrical hole B as shown in (c) and (d).
[0013]
When the drive shaft moves around an arc having a radius smaller than the radius of the cylindrical hole B, the section on the surface side is cylindrical as shown in FIGS. Then, the cavity C is formed in a columnar shape having a diameter on the back side larger than that on the surface side.
[0014]
In this case, the drive shaft specifically relates to the center of the cylindrical hole as described in claim 5 , and is moved in at least one side in one direction as indicated by a straight arrow in FIG. As indicated by the arrow, the center of the cylindrical hole B is moved around an arc having a radius smaller than the radius of the cylindrical hole B. In FIG. 8, the broken line indicates the cylindrical hole B, the thick line indicates the shape of the cavity C, the thin line indicates the widening bit, and the alternate long and short dash line indicates the locus of the drive shaft.
[0015]
In any shape, the cavity C is formed so that the cross-sectional area of the cavity C in the concrete or the like is larger than the cross-sectional area of the section on the surface side, so that the filler filled in the cavity C is When a pulling force is applied to the surface side of an object to be fixed such as existing concrete, a shape having an engagement portion C1 that can engage the object to be fixed to the surface side in the cavity C is formed.
[0016]
Due to the shape of the filler having the engaging portion C1, in addition to the pulling force acting on the anchor body fixed in the filler, in addition to the adhesive force between the filler and the inner peripheral surface of the cavity C, The resistance is increased by the bearing pressure between the engagement portion and the fixing target, and therefore the resistance is increased as compared with the case of only the adhesive force.
[0017]
By increasing the resistance of the filler, it is not necessary to expand the range of the cavity by increasing the depth or diameter of the removal part of the fixing body or increasing the number of the parts to be fixed in comparison with the case of depending only on the adhesive force. Therefore, even if the object to be anchored is reinforced concrete or steel-framed reinforced concrete, there is no risk of damage to the reinforcing bars due to collision with the reinforcing bars in the concrete, that is, after the anchor body is fixed, there is no effect on the strength of existing concrete The reliability of existing concrete is improved. For this reason, it is not necessary to add extra concrete to ensure the strength of existing concrete.
[0018]
In particular, in the case where at least a portion of the entire cylindrical hole including the cavity extends in the depth direction from the surface side to the back side as described above, and the cross-sectional area gradually increases, the engaging portion Is inclined with respect to the cross section perpendicular to the axis of the anchor body, so that the fixed body such as existing concrete is pulled from the outer edge of the engaging portion of the filler to the surface side of the fixed body against the pulling force received from the filler. Since resistance occurs in a region that gradually increases over time, the safety against destruction of the fixing object is high.
[0019]
Based on the cutting device specifically, rotatable rotation body relative to the base is supported, on the rotating body, while holding the drive shaft, a driving device for rotating is supporting the drive shaft. The drive device is movable relative to the rotating body in at least one side in one direction with respect to the center of the cylindrical hole. The driving device rotates with the rotating body with respect to the base, and the rotating body rotates while the drive shaft moves in one direction. As a result, the drive shaft moves on an arc having a radius smaller than the radius of the cylindrical hole with the center of the cylindrical hole as the center.
[0020]
The rotating body to drive More specifically, with respect to the rotating body, becomes the drive shaft by being supported on at least movable support on one side in one direction with respect to the center of the cylinder bore and movable in one direction, the support The drive shaft moves on an arc with a radius smaller than the radius of the cylinder hole, centering on the center of the cylinder hole while the material moves with respect to the rotor or while the rotor rotates with respect to the base. To do. Until the drive shaft moves on an arc having a radius smaller than the radius of the cylindrical hole, the drive shaft draws a spiral curved locus.
[0021]
While the drive shaft circulates on an arc having a radius smaller than that of the cylindrical hole, the drive shaft continues to rotate, and the widening bit connected to the tip of the drive shaft cuts concrete around the cylindrical hole to form a cavity.
[0022]
The rotating body is rotated with respect to the base by a turning device supported by the base, and the support member is moved in one direction with respect to the rotating body by a moving device supported by the rotating body.
[0023]
The shape of the widening bit is not particularly limited, and a free shape such as an eccentric shape or a bent shape with respect to the drive shaft can be adopted, but the basic shape is a cylindrical shape as described in claim 3. when, it may consist of a plurality of discs as described in claim 4, in the former case the outer circumference of the cylinder, in the latter case, each cutting edge on the outer periphery of each disc is attached.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, on the surface layer side of the existing concrete A or other fixed body, after the cylindrical cylindrical hole B is drilled, the cross-sectional area is relatively larger than the cross-sectional area on the surface side in at least a part of the depth direction. Is a cutting device 1 that forms a large cavity C.
[0025]
The anchored body 15 includes both a structural member and a non-structural member depending on the role of the anchor body 15 fixing the member connected thereto to the anchored body, in addition to concrete and soil cement solidified body, stone material, brick, Includes all materials that can be perforated, such as concrete blocks. Below, to-be-fixed material is represented to the existing concrete A.
[0026]
As shown in FIGS. 1 and 2, the cutting apparatus 1 includes a base 2 fixed to the surface of the existing concrete A, and a widening bit 7 having a cutting blade 8 that is supported by the base 2 and rotates around the drive shaft 6. Then, the drive shaft 6 moves from the center of the cylindrical hole B while rotating, and the widening bit 7 rotates to cut the concrete around the cylindrical hole B to form the cavity C.
[0027]
The entire cylindrical hole B including the cavity C is not only for concrete parts such as pillars, beams, walls and foundations of existing buildings, but also for concrete parts such as bridge girders, piers and foundations (footings) of existing bridges. When a non-structural member such as a structural member or a wall panel, or a facility member or other member is added, it is formed in the existing concrete A portion.
[0028]
Cavity C can be formed if there is a part of existing concrete A. Therefore, regardless of whether the existing structure is a building structure or a civil engineering structure, the structure of the structure body is reinforced concrete ( It may be steel-framed reinforced concrete) or steel-framed.
[0029]
As shown in FIG. 9, the cylindrical hole B is formed in a columnar shape separated from the periphery by rotating a core tube D having a bit D1 at the tip, and the columnar concrete separated from the periphery is in the manner of core removal. It is pulled out as it is. The core tube D is connected to a drive shaft D3 connected to the drive device D2, and the drive device D2 is supported by a support member E fixed to the surface of the existing concrete A.
[0030]
The cutting device 1 of the present invention will be described by way of specific example configuration illustrated in FIGS.
[0031]
The base 2 is provided with a plurality of anchor bolts 3 for fixing the base 2 itself to the surface of the existing concrete A, and the base 2 is stabilized when the anchor bolts 3 are screwed into the concrete. By adjusting the screwing depth of each of the plurality of anchor bolts 3, the horizontal accuracy of the base 2 is ensured even when the surface of the existing concrete A has an inclined surface or unevenness.
[0032]
A rotating body 4 that is rotatable with respect to the base 2 is supported on the base 2, and a driving device 5 that rotates the driving shaft 6 while supporting the driving shaft 6 of the widening bit 7 is supported on the rotating body 4. . An opening 2a for rotatably supporting the rotating body 4 is formed in the base 2, and the rotating body 4 is supported by the base 2 in a state insulated from the base 2 by the bearing 9 in the opening 2a. The drive shaft 6 is inserted into the cylindrical hole B through the opening 2a. In FIG. 2, 2b indicates a fixing hole for inserting and fixing the support member E that supports the driving device D2 for rotating the core tube D described above. The base 2 is also provided with wheels 2c for moving the base 2.
[0033]
The rotating body 4 is supported with respect to the rotating body 4 with respect to the center of the cylindrical hole B, and a support material 10 that is movable in at least one side in one direction is supported. 5 moves with respect to the rotating body 4 to one side or both sides with respect to the center of the cylindrical hole B. The support member 10 is placed on the rotating body 4 and rotates with the rotating body 4 with respect to the base 2. The driving device 5 is placed on the support material 10 and integrated with the support material 10.
[0034]
The base 2 supports a turning device 11 that rotates the rotating body 4 around its center, and the rotating device 4 supports a moving device 12 that moves the support material 10 relative to the rotating body 4.
[0035]
A motor or the like is used for the turning device 11, and any combination of the turning device 11 and the rotating body 4 may be used as long as it is a mechanism that converts the rotational force of the turning device 11 into the rotational motion of the rotating body 4. Gears are used for the turning device 11 and the rotating body 4 so that the device 11 can resist the reaction force during drilling by the widening bit 7 and the rotating body 4 does not reversely rotate.
[0036]
In this case, the turning device 11 is fixed to the base 2 with the drive shaft 11a directed vertically, and a gear 11b is connected to the drive shaft 11a. On the other hand, a tooth profile 4a as shown in FIG. 3 that meshes with the gear 11b of the turning device 11 is formed on the entire outer periphery of the rotating body 4. The rotating body 4 is rotated by the rotation of the gear 11b of the turning device 11. Rotate around the center. As the rotating body 4 rotates, the support member 10 and the driving device 5 supported by the rotating body 4 rotate with respect to the base 2.
[0037]
A slide guide 13 for guiding the linear motion of the support member 10 with respect to the rotary member 4 is fixed to the upper surface of the rotary member 4 at a position where the drive shaft 6 is removed. Supported as possible. A moving device 12 for linearly moving the support member 10 is fixed on the rotating body 4.
[0038]
A motor or the like is also used for the moving device 12. Here, any combination of the moving device 12 and the support material 10 may be used as long as the mechanism converts the rotational force of the moving device 12 into the linear motion of the support material 10. A combination of a motor 121 and a steel bar 122 with a full length threaded (pole screw) 122 so that the rotational force can be converted into a linear motion while resisting the reaction force of the time, and the support material 10 does not reverse. The worm gear is used as a mechanism for transmitting the power of the motor 121 to the steel bar 122.
[0039]
In this case, as shown in FIG. 3, the worm 12b is pivotally supported on the shaft 12a of the motor 121, the worm wheel 12c is pivotally supported on the end of the steel bar 122, and the worm wheel 12c is rotated by the rotation of the worm 12b. Rotates.
[0040]
The steel bar 122 is supported by the rotating body 4 so as to be rotatable about its axis through bearings at both ends, and the steel bar 122 is inserted into a support part 10 a formed in a part of the support material 10. The inner peripheral surface of the support portion 10a through which the steel bar 122 is inserted is cut with a female screw that is screwed into the screw of the steel bar 122. The support material 10 is moved in the axial direction of the steel bar 122 by the rotation of the steel bar 122 accompanying the rotation of the motor 121. Take a round trip.
[0041]
When a gear is used as a mechanism for transmitting the power of the motor 121 to the steel bar 122, a pinion may be pivotally supported on the shaft 12a of the motor 121 and a rack may be formed on the support portion 10a of the support member 10 instead of the worm gear.
[0042]
The moving operation of the support member 10 by the moving device 12 and the rotating operation of the rotating body 4 by the turning device 11 are performed independently, and the moving operation and the rotating operation do not necessarily have to be performed simultaneously. There may be a case where only the movement by the moving device 12 is performed and a case where the movement by the moving device 12 and the rotation by the turning device 11 are performed simultaneously with the rotation of the drive shaft 6.
[0043]
The drive shaft 6 linearly moves along the slide guide 13 with respect to the rotating body 4 by the moving operation by the moving device 12, and is smaller than the radius of the cylindrical hole B around the center of the cylindrical hole B by the rotating operation by the turning device 11. Move on a radius arc.
[0044]
A widening bit 7 as shown in FIG. 1 is connected or fixed to the tip of the drive shaft 6 of the driving device 5. The widening bit 7 is inserted into the cylindrical hole B after the cylindrical hole B has been drilled in advance. The The height of the widening bit 7 is equal to or less than the height of the cylindrical hole B. After the widening bit 7 is inserted, the support member 10 is linearly moved by the moving device 12 while rotating the drive shaft 6 or the moving device 12. The rotating member 4 is rotated by the swivel device 11 while the support member 10 is linearly moved by the cutting device 8 so that the cutting blade 8 of the widening bit 7 drills the hole wall on the back side of the cylindrical hole B.
[0045]
FIG. 5 shows an example of forming the cylindrical widening bit 7. In FIG. 1 and FIG. 5, a disk-shaped plate 7a is welded to the center of an axial direction of a cylinder, for example, a steel pipe, the drive shaft 6 is passed through the plate 7a, and nuts 7b are tightened from both sides of the plate 7a. 7 is connected to the drive shaft 6, but the method of connecting the widening bit 7 to the drive shaft 6 is not limited.
[0046]
In the case of the cutting apparatus 1 shown in FIGS. 1 to 4, the cavity C is formed by rotating the driving shaft 6 of the driving apparatus 5 and rotating the widening bit 7, while moving the support material 10 with respect to the rotating body 4 by the moving apparatus 12. The rotating body 4 is rotated little by little, for example, at a rotational speed of, for example, about a few revolutions / minute while being moved little by little, for example, at a speed of about several mm to several tens of mm / minute. The cutting blade 8 of the widening bit 7 cuts the hole wall of the cylindrical hole B to form a cavity C. The locus of the drive shaft 6 at this time is as shown by a one-dot chain line in FIG.
[0047]
Concrete powder that has been cut and crushed by the cutting blade 8 is eliminated by jetting air or by suction.
[0048]
If a cylindrical widening bit 7, the outer periphery of the cutting edge 8 is widened bits 7, continuously in the interval of the length of the axial direction, or it intermittently being projected, FIG. 5 - (a) in the axial direction The cutting blades 8 are arranged in a spiral shape so that the drive shaft 6 does not receive an excessive torsional moment when the plurality of cutting blades 8 arranged at the same time cut concrete at the same time. Figure 5 - boring shape by widening the bit 7 illustrated in (a) is as shown in FIG. 5- (b).
[0049]
FIG. 6A shows an example of forming the widening bit 7 when the widening bit 7 is composed of a plurality of discs 71. In this case, the drive shaft 6 has a shape that penetrates the entire disk 71. The cutting blade 8 protrudes continuously or intermittently on the outer periphery of the disc 71. Boring shape by widening the bit 7 illustrated in Fig. 6- (a) is as shown in FIG. 6- (b).
[0050]
In any case, the cross-sectional area of the cavity C is formed to be relatively larger than the cross-sectional area of the portion on the surface side thereof, so that the filler 14 such as mortar, concrete, or adhesive filled therein can be anchored. By receiving a pulling force to the surface side of the existing concrete A acting on the body 15, the existing concrete A is engaged in the surface side of the existing concrete A in the cavity C, or has an engaging portion C 1 that can be engaged.
[0051]
As shown in FIG. 7, when the entire cylindrical hole B including the cavity C is divided into two or more sections in the depth direction, the engaging portion C1 is located in a portion of the cavity C closer to the surface side of the inner portion. It is formed. In the case of only the truncated cone shape or including the truncated cone shape, the engaging portion C1 is formed in a portion closer to the surface side in a shape inclined with respect to the cross section orthogonal to the axis of the anchor body 15.
[0052]
After the formation of the cavity C, the inside thereof is filled with a filler 14 and an anchor body 15 such as an anchor bolt is inserted. After the filler 14 is cured, a new structural member or the like is newly connected to the anchor body 15 directly or indirectly.
[0053]
Fig. 10 shows the existing concrete A, which is foundation concrete, with a cavity C around the existing bridge piers and other column bases 16 for fixing the base plate 17 to the anchor body 15, and seismic elements on the gusset plate 18 joined to the base plate 17. The case where the brace 19 is connected is shown.
[0054]
The drawing shows a case where the anchor body 15 is inserted vertically, but when the anchor body 15 is inserted sideways, the cavity C is formed sideways.
[0055]
【The invention's effect】
A base is fixed to the surface of an existing concrete or other fixed body, and a cutting device is constituted by a widening bit having a cutting blade that is supported by the base and rotates around a drive shaft. After drilling the cylindrical hole, move it from the center of the cylindrical hole while rotating the drive shaft, and cut the concrete around the cylindrical hole with the widening bit, so that the depth direction in the cylindrical hole In order to form a cavity having a cross-sectional area that is relatively larger than the cross-sectional area on the surface side in at least some sections, resistance to the pulling force that acts on the anchor body without expanding the range of the removal portion of the fixing body Can be increased.
[0056]
Since the cavity is formed so that the cross-sectional area of the cavity is larger than the cross-sectional area of the section on the surface side, the filler filled in the cavity receives the pulling force toward the surface side of the fixing body. The shape of the fixing member having an engaging portion that can be engaged with the surface of the fixing member within the fixing member, and the shape of the filler having the engaging portion, the pulling force acting on the anchor body fixed in the filler On the other hand, in addition to the adhesion force between the filler and the inner peripheral surface of the cavity, the resistance is increased by the supporting pressure between the engagement portion and the fixing target, so that the resistance force is increased as compared with the case of only the adhesion force. .
[0057]
By increasing the resistance of the filler, it is not necessary to expand the cavity range by increasing the depth or diameter of the cavities or increasing the number of cavities in comparison with the case of relying solely on the adhesive force. In the case of reinforced concrete or steel-framed reinforced concrete, there is no risk of damage to the reinforcing bars due to collision with the reinforcing bars in the concrete, that is, there is no effect on the strength of the existing concrete, and the reliability of the existing concrete after anchoring the anchor body Improves. For this reason, it is not necessary to add extra concrete to ensure the strength of existing concrete.
[0058]
In particular, when at least a part of the entire cavity in the depth direction extends from the surface side to the back side and the cross-sectional area gradually expands, the engaging portion is orthogonal to the axis of the anchor body. By inclining with respect to the cross section, the member to be fixed resists the pulling force received from the filler in a region that gradually expands from the outer edge of the engaging portion of the filler to the surface side of the member to be fixed. High safety against fixing member destruction.
[Brief description of the drawings]
FIG. 1 is an elevational view showing a configuration example of a cutting device.
2 is a plan view of FIG. 1. FIG.
FIG. 3 is a perspective view showing a relationship between a moving device on a rotating body and a support member.
4 is a longitudinal sectional view through the drive shaft of FIG. 3. FIG.
5A is an elevation view showing a configuration example of a cylindrical widening bit, and FIG. 5B is a cross-sectional view showing the shape of a cavity formed by the widening bit.
6A is an elevation view showing a configuration example of a widening bit composed of a plurality of discs, and FIG. 6B is a cross-sectional view showing the shape of a cavity formed by the widening bit.
[Fig. 7] (a), (c), and (e) are plan views showing the relationship between a cylindrical hole and a cavity, and (b), (d), and (f) are (a), (c), ( It is a longitudinal cross-sectional view of e).
FIG. 8 is a plan view showing the movement of the widening bit with respect to the cylindrical hole.
FIG. 9 is an elevation view showing a state of forming a cylindrical hole by the core tube.
FIG. 10 is a longitudinal sectional view showing an example of fixing an anchor body to a cavity.
[Explanation of symbols]
A ... Existing concrete, B ... Cylinder hole, C ... Cavity, C1 ... engagement part, D ... Core tube, D1 ... Bit, D2 ... Drive device, D3 ... Drive shaft, E ... Supporting member, 1 ... Cutting device, 2 ... Base, 2a ... Opening, 2b ... Fixing hole, 2c ... Wheel, 3 ... Anchor bolt, 4 ... Rotating body, 4a ... Tooth profile, 5 ... ... drive device, 6 ... drive shaft, 7 ... widening bit, 71 ... disc, 8 ... cutting blade, 9 ... bearing, 10 ... support material, 10a ... support, 11 ... swivel device 11a ... drive shaft, 11b ... gear, 12 ... moving device, 121 ... motor, 122 ... steel, 12a ... shaft, 12b ... worm, 12c ... worm wheel, 13 ... slide guide, 14 …… Filler, 15 …… Anchor body, 16 …… Column base, 17 …… Base plate, 18 …… Gusset plate, 19 …… Brace.

Claims (5)

A base fixed to the surface of the member to be fixed, and a cylindrical hole that is supported by the base and drilled prior to the member to be fixed, and rotates around the drive shaft to fix the anchor body. A cutting device having a widening bit to form a cavity for
The height of the widening bit is less than or equal to the height of the cylindrical hole,
The base is fixed around the cylindrical hole to be drilled on the surface of the fixing body,
A rotating body that is rotatable with respect to the base and a turning device that rotates the rotating body around its center are supported on the base.
A supporting member that linearly moves in the radial direction of the cylindrical hole with respect to the rotating body, and a moving device that linearly moves the supporting member in the radial direction are supported on the rotating body,
A drive device for rotating the drive shaft is supported by the support material,
The support member, the moving device, and the driving device rotate with respect to the base as the rotating body rotates,
The anchor member fixing portion cutting apparatus, wherein the support member and the driving device linearly move in the radial direction with respect to the rotating body by the moving device.   2. An opening for rotatably supporting the rotating body is formed in the base, and the rotating body is supported by the base while being insulated from the base in the opening. The anchor body fixing part cutting device according to claim 1.   2. The cutting device for anchor body fixing portion according to claim 1, wherein the widening bit is cylindrical.   2. The anchor body fixing portion cutting device according to claim 1, wherein the widening bit is composed of a plurality of discs.   The drive shaft moves on an arc having a radius smaller than the radius of the cylindrical hole with respect to the center of the cylindrical hole in a state of moving to at least one side in one direction or while moving. The cutting apparatus for anchor body fixing | fixed part in any one of Claims 1 thru | or 4.

Images