JP2015014140A - Fixing structure of post-driven anchor bolt, and fixing method of post-driven anchor bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a post-driven anchor bolt exhibit a stable resistive force against draw-out having a long life time without lowering the resistive force against draw-out of the post-driven anchor bolt with the lapse of time.SOLUTION: A fixing structure of a post-driven anchor bolt is used to fix the anchor bolt 100 in a drilled hole in an existing base material. The anchor bolt has a linear shank 101 and a locking part 102 protruding in a direction perpendicular to the shank at a tip of the shank. The drilled hole includes: a first drilled part 21 opened in a surface of the base material; and a second drilled part 22 drilled in the deepest part of the first drilled part and having a cross section widely opened so that a step part 23 is formed between the first drilled part 21 and the second drilled part 22. The locking part is inserted into the first drilled part when the anchor bolt is fixed, and the locking part is latched to the step part when the locking part reaches the second drilled part.

Description

  The present invention relates to a fixing structure of a post-cast anchor bolt installed on existing concrete and a fixing method of the post-cast anchor bolt.

2. Description of the Related Art Conventionally, post-cast chemical anchor bolts are known in which a hole is formed in existing solidified concrete after being cast and an anchor bolt is driven and fixed.
In this post-casting chemical anchor bolt construction method, an embedded hole is first drilled in an existing concrete with a drill or the like, and the inner surface is cleaned. And after inserting the chemical capsule which enclosed liquid resin in the inside of an embedding hole, an anchor bolt is inserted and a chemical capsule is torn, and filling resin is filled in the clearance gap between an embedding hole and an anchor bolt. The fixing resin is cured after a certain curing period, and the anchor bolt is fixed (for example, see Patent Document 1).

Japanese Unexamined Patent Application Publication No. 2004-11345 (see paragraphs [0002]-[0006], FIG. 3, FIG. 4, etc.).

  However, in the structure of the chemical anchor bolt as shown in Patent Document 1, the anchor bolt comes off when a large tensile force is applied for a long time or when the fixing resin is deteriorated over time while exposed to the tensile force. There is a possibility. Further, it has been pointed out that a similar accident may occur when the filling rate of the fixing resin itself is low.

  The present invention has been made in order to solve the above-described problems, and exhibits a stable pull-out resistance capability with a long service life without reducing the pull-out resistance force of the trailing anchor bolt over time. The purpose is that.

  The anchoring structure for a post-cast anchor bolt according to the present invention is a structure for fixing a post-cast anchor bolt for fixing an anchor bolt to an existing excavation hole of a base material. The anchor bolt includes a linear shaft portion and the shaft. A locking portion projecting in a direction perpendicular to the shaft portion at a tip of the shaft, and the excavation hole includes a first drilling portion opened on a surface of the base material, and a first drilling portion A second drilling portion having a cross section that is expanded so that a stepped portion is formed between the first drilling portion and the deepest portion, and the anchor bolt is fixed when the anchor bolt is fixed. When the locking part is inserted into the first drilling part and the locking part reaches the second drilling part, the locking part is fixed by being hooked to the stepped part. It is.

  Further, the post-fixed anchor bolt fixing method according to the present invention is a post-fixed anchor bolt fixing method for fixing the anchor bolt to an existing base material excavation hole, and the anchor bolt includes a linear shaft portion and A first step of excavating a first drilling portion having a locking portion projecting in a direction perpendicular to the shaft portion at a tip of the shaft portion and having a hole formed in a surface of the base material; Excavating a second drilled portion having a cross-section that has been expanded so that a stepped portion is formed between the first drilled portion and the first drilled portion; and A fixing method comprising: step 3 for inserting into one drilling portion; and step 4 for latching the locking portion to the stepped portion when the locking portion reaches the second drilling portion. .

  According to the fixing structure of the post-casting anchor bolt and the fixing method of the post-casting anchor bolt according to the present invention, since the locking portion arranged at the tip of the anchor bolt is mechanically engaged with the existing concrete, Long-lasting and stable ability to pull out.

It is a figure which drills the center hole part 20 with the drill 10 which concerns on Embodiment 1 of this invention. It is a figure which forms the 1st drilling part 21 with a rectangular cross section with the excavation tool which has the excavation rotation part 12 which has a rotating shaft perpendicular | vertical to the axis | shaft 11 at the front-end | tip of the axis | shaft 11 concerning Embodiment 1 of this invention. When the excavation rotating part 12 according to the first embodiment of the present invention reaches the deepest part of the central drilling part 20, the excavation rotating part 12 is rotated around the shaft 11 while rotating, so that a cylindrical second drilling hole is obtained. It is a figure which forms the part 22. FIG. It is the figure which inserted the anchor bolt 100 in the 1st hole part 21 excavated which concerns on Embodiment 1 of this invention. The anchor bolt 100 is rotated from the state of FIG. 1D according to Embodiment 1 of the present invention to rotate the locking portion 102 in the second drilling portion 22, and the locking portion 102 is latched to the stepped portion 23. FIG. It is the figure which injected the filler 103 for anchor bolt fixation to the clearance gap between the anchor bolt 100 of the state of FIG. 1E which concerns on Embodiment 1 of this invention, and the 1st drilling part 21 and the 2nd drilling part 22. . It is the figure which attached the structure attachment member 104 fixed to the surface of the base material 1 with the anchor bolt 100 with the nut 105 in the state of FIG. 1F which concerns on Embodiment 1 of this invention. 1A according to Embodiment 1 of the present invention, with the anchor bolt 100 of FIG. 1G attached to the base material 1 as viewed in section A passing through the shaft portion 101 of the anchor bolt 100 and section B rotated 90 ° from the section A. It is the figure displayed by the cross section. It is a figure which drills the center hole part 20 with the drill 10 which concerns on Embodiment 2 of this invention. It is a figure which forms the 1st drilling part 21 with a rectangular cross section with the excavation tool which has a pair of high pressure water injection nozzle 13 provided in the front-end | tip of the axis | shaft 11 which concerns on Embodiment 2 of this invention. When the high-pressure water injection nozzle 13 according to Embodiment 2 of the present invention reaches the deepest part of the central drilling portion 20, the high-pressure water injection nozzle 13 is rotated around the axis 11 while being rotated, and the second cylindrical member is rotated. It is a figure which forms the drilling part. It is the figure which inserted the anchor bolt 200 in the 1st hole part 21 excavated which concerns on Embodiment 2 of this invention. The anchor bolt 100 is rotated from the state of FIG. 2D according to the second embodiment of the present invention to rotate the locking portion 202 in the second drilling portion 22, and the locking portion 202 is latched to the stepped portion 23. FIG. It is the figure which inject | poured the anchor material 203 for anchor bolt fixation to the clearance gap between the anchor bolt 100 of the state of FIG. 2E which concerns on Embodiment 2 of this invention, and the 1st drilling part 21 and the 2nd drilling part 22. . It is the figure which attached the structure attachment member 204 fixed to the surface of the base material 1 with the anchor bolt 200 with the nut 205 in the state of FIG. 2F which concerns on Embodiment 2 of this invention. It is the figure which showed each step at the time of implementing the fixing structure and fixing method of the back strike anchor bolt concerning Embodiment 3 of this invention in time series. It is the figure which showed the swing drill which concerns on Embodiment 3 of this invention. It is the figure which showed the rotary head polisher which concerns on Embodiment 3 of this invention. It is the figure which showed each step at the time of implementing the fixing structure and fixing method of the back strike anchor bolt concerning Embodiment 4 of this invention in time series.

Embodiment 1 FIG.
FIG. 1A to FIG. 1G are diagrams showing, in chronological order, each stage when a post-fixed anchor bolt fixing structure and a fixing method according to Embodiment 1 of the present invention are implemented.
Since construction is performed in the order of FIG. 1A to FIG. 1G, description will be made in this order.
FIG. 1H shows a state in which the anchor bolt 100 of FIG. 1G is attached to the base material 1 in a section A viewed through the shaft 101 of the anchor bolt 100 and a section B viewed from the section rotated 90 ° from the section A viewed. It is.
1A to 1G, (a) shows an axial cross section of the excavated central drilling portion 20, and (b) and (c) are cross sections at the P and Q positions indicated in the axial cross section (a). As views, P view and Q view are shown.

FIG. 1A is a view of drilling the central drilling portion 20 with a drill 10.
First, the cylindrical center hole portion 20 is drilled in the existing base material 1 such as concrete with a drill 10 or the like.
The depth and the diameter of the center hole portion 20 to be drilled are appropriately adjusted according to the dimensions of the anchor bolt 100 to be used.

FIG. 1B is a diagram in which a first drilling portion 21 having a rectangular cross section is formed by a drilling tool having a drilling rotation portion 12 having a rotation axis perpendicular to the shaft 11 at the tip of the shaft 11.
The first drilling part 21 is inserted into the central drilling part 20 with the shaft 11 of the excavation tool, and rotates a pair of excavation rotating parts 12 provided at the tip of the shaft 11 to face the central drilling part 20 at two positions. Is drilled to the deepest part of the central drilling part 20 (the deepest part is a concept including the vicinity of the deepest part). At this time, the pair of excavation rotating parts 12 forms a first drilling part 21 having a rectangular cross section without being rotated around the axis 11 of the excavation tool.
The excavation rotating part 12 can be applied as long as it is an excavation bit having a hardness capable of cutting the base material 1.

In FIG. 1C, when the excavation rotating part 12 reaches the deepest part of the central drilling part 20, the excavation rotating part 12 is rotated around the shaft 11 while rotating to form a cylindrical second drilling part 22. FIG.
Since the second drilling portion 22 is formed by rotating the excavation rotating portion 12 around the shaft 11, the second drilling portion 22 has a diameter substantially the same as the long side of the rectangular cross section of the first drilling portion 21.
That is, the second drilled portion 22 has a circular cross section having a diameter larger than the short side of the rectangular cross section of the first drilled hole portion 21, and the stepped portion 23 is formed on the boundary surface thereof.
Here, FIG. 1C (c) to FIG. 1G (c) show an example of a complete circular section in which the rotation of excavation of the second drilling portion 22 is performed by 360 °, and FIG. 1C (c ′) to FIG. 1G (c ′) shows an example in which the rotation of excavation of the second drilling portion 22 is stopped halfway to form a pair of fan-shaped cross sections.

FIG. 1D is a view in which an anchor bolt 100 is inserted into the first drilled hole portion 21 excavated. The anchor bolt 100 has a shape having a locking portion 102 projecting in a direction perpendicular to the shaft portion 101 at the tip of the linear shaft portion 101. The locking part 102 has a rectangular shape having a longitudinal direction and a short direction, or an elliptical shape.
When the anchor bolt 100 is inserted into the first drilling portion 21, the locking portion 102 is inserted with the longitudinal direction parallel to the long side of the first drilling portion 21.
Then, the locking portion 102 moves until it comes into contact with the bottom surface 24 of the second drilling portion 22.

FIG. 1E is a diagram showing a state in which the anchor bolt 100 is rotated from the state of FIG. 1D to rotate the locking portion 102 in the second drilling portion 22 and the locking portion 102 is hooked on the stepped portion 23. is there.
Thus, by mechanically locking the locking portion 102 to the stepped portion 23, it is possible to exhibit a stable resistance to pulling out against a pulling load applied to the anchor bolt 100.

FIG. 1F is a diagram in which an anchor bolt fixing filler 103 is injected into the gap between the anchor bolt 100 in the state of FIG. 1E and the first drilled hole portion 21 and the second drilled hole portion 22.
The filler 103 is an adhesive that is injected into the gap in a flowing state and solidifies to fix the anchor bolt 100. For example, a resin or mortar concrete can be used.

FIG. 1G is a diagram in which a structure attachment member 104 that is fixed to the surface of the base material 1 with the anchor bolt 100 in the state of FIG. 1F is attached with a nut 105.
The structure attachment member 104 is an attachment member for attaching, for example, a ceiling bracket and supporting the ceiling material from the base material 1.
In this way, the planar structure mounting member 104 is brought into close contact with the surface of the base material 1, and the anchor bolt 100 inserted through the structure mounting member 104 is sandwiched between the step portion 23 and the nut 105, thereby The structure attached to the attachment member 104 can be fixed to the base material 1 with sufficient strength. Furthermore, even if a pulling force is applied to the anchor bolt due to a load acting on the structure, the structure is reliably ensured over a long period of time. Can be fixed. Also, the anchor bolt fixing filler 103 is injected into the gap between the first drilling portion 21 and the second drilling portion 22, and the anchor bolt 100 is rotated by the fixing force of the filler 103, so that the locking portion 102 prevents the anchor bolt 100 from falling off the stepped portion 23 and the anchor bolt 100 falling out of the drilled portion.

FIG. 1H shows a state in which the anchor bolt 100 of FIG. 1G is attached to the base material 1 as viewed in section A (a) passing through the shaft 101 of the anchor bolt 100 and section viewed in section B rotated 90 ° from the section A (see FIG. d). Moreover, (b) and (c) show the P view and the Q view, respectively, as the cross-sectional views at the P position and Q position displayed on the axial cross sections (a) and (b).
In this way, the locking portion 102 of the anchor bolt 100 is mechanically locked to the step portion 23, and the anchor bolt is fixed to the gap between the anchor bolt 100, the first hole portion 21, and the second hole portion 22. In addition, the structure mounting member 104 for fixing the anchor bolt 100 to the surface of the base material 1 is tightened and attached with a nut 105, so that the service life is long and the pulling is stable. It is possible to obtain a fixed structure for the post-fixed anchor bolt that exhibits the counter capability.

Embodiment 2. FIG.
FIG. 2A to FIG. 2G are diagrams showing, in time series, each stage when carrying out the fixing structure and fixing method of a post-cast anchor bolt according to Embodiment 2 of the present invention.
2A to 2G show the axial cross section of the excavated center hole portion 20, and FIGS. 2B and 2C show the cross sections at the P position and the Q position shown in the axial cross section (a). As views, P view and Q view are shown.
The second embodiment is an example in which the construction method for forming the first drilled portion 21 and the second drilled portion 22 of the first embodiment is different. Therefore, description of portions common to the first embodiment is omitted.

The difference from the first embodiment is that the first embodiment performs excavation by the pair of excavation rotating portions 12 when the first drilling portion 21 and the second drilling portion 22 are formed. In the second mode, the base material 1 is excavated by jetting high-pressure water.
2B and 2C show the state of excavation with high-pressure water.

As shown in FIG. 2B, the first drilling portion 21 is formed by inserting the shaft 11 of the excavating tool into the central drilling portion 20 and the central drilling portion 20 by a pair of high-pressure water injection nozzles 13 provided at the tip of the shaft 11. Are formed by excavating the two opposite positions to the deepest part of the central drilling part 20 (the deepest part is a concept including the vicinity of the deepest part). At this time, the pair of high-pressure water injection nozzles 13 forms the first hole 21 having a substantially rectangular cross section without being rotated around the shaft 11 of the excavation tool.
The high-pressure water injection nozzle 13 is set to a water pressure capable of cutting the base material 1.

FIG. 2C is a diagram in which the high-pressure water spray nozzle 13 is rotated around the axis 11 when the high-pressure water spray nozzle 13 reaches the deepest portion of the center hole portion 20 to form a cylindrical second hole portion 22. It is.
As described above, the first drilling portion 21 and the second drilling portion 22 similar to those of the first embodiment are formed. The anchor bolt 200 to be used has the same shape as that of the first embodiment, and has a shape having a locking portion 202 protruding in a direction perpendicular to the shaft portion 201 at the tip of the linear shaft portion 201. Yes. And it fixes to the base material 1 with the filler 203, the structure attachment member 204, and the nut 205. FIG.

Embodiment 3 FIG.
FIGS. 3A to 3D are diagrams showing, in chronological order, each stage when the post-fixed anchor bolt fixing structure and the fixing method according to the third embodiment of the present invention are implemented. FIGS. 3A and 3C are cross-sectional views in the axial direction of the central drilling portion 20, and FIGS. 3B and 3D are cross-sectional views in the second drilling portion 22.
FIG. 4 is a diagram showing a swing drill 15 that forms a hole drilling portion according to the third embodiment.
FIGS. 5A and 5B are diagrams showing the rotary head polishing machine 16 that forms the hole-drilling portion according to the third embodiment. FIG. 5B is a sectional view in the axial direction of the central drilling portion 20, and FIG. 5A is a sectional view in the second drilling portion 22.

  The drilling portion into which the anchor bolt 300 in the third embodiment is inserted is a drilling tool provided with the high-pressure water injection nozzle 13 in the second embodiment or an L-shaped drilling blade 14 at the tip as shown in FIG. Can be formed by a swing drill 15 having a rotating head or a rotating head polishing machine 16 having a rotating head 17 at the tip as shown in FIG.

First, a cylindrical center hole portion 20 is drilled in an existing base material 1 such as concrete with a drill 10 or the like.
Next, the excavation tool, the swing drill 15, the rotary head polisher 16 and the like provided with the high-pressure water injection nozzle 13 in the second embodiment are used as the deepest part of the central drilling part 20 (the deepest part includes the vicinity of the deepest part). And the second drilling hole having a circular cross section with a diameter larger than the diameter of the central drilling part 20 by rotating the high pressure water injection nozzle 13, the excavation blade 14 and the rotary head 17 around the shaft 11. Part 22 is formed.
In the drilled portion thus formed, a stepped portion 23 is formed due to the difference in diameter of the circular cross sections of the central drilled portion 20 and the second drilled portion 22.
Since the step portion 23 is formed at the boundary surface between the center hole portion 20 and the second hole portion 22 in the hole portion of the third embodiment, the cross section is rectangular as in the first and second embodiments. The first drilling portion 21 is not formed.
In addition, although the 2nd drilling part 22 was made into circular cross-sectional shape, rotation of the excavation of the 2nd drilling part 22 is stopped on the way similarly to Embodiment 1, 2, and it is good also as a pair of fan-shaped cross-sectional shape.

FIGS. 3A and 3B are views in which the anchor bolt 300 is inserted into the excavated center hole portion 20. The anchor bolt 300 includes a projecting portion 302 that is divided into two in the axial direction at the tip end side of the shaft portion 301, bends in a direction perpendicular to the side surface of the shaft portion 301, and protrudes in an L shape.
The shaft portion 301 is formed of a material that can be elastically deformed.
When the anchor bolt 300 is inserted into the center hole portion 20, the shaft portion 301 is elastically deformed with the tip of the protruding portion 302 contacting the wall surface of the center hole portion 20 as shown in FIG. The distance between the tips of the two projecting portions 302 moves in the central drilling portion 20 in a state where the distance between the tips of the projecting portions 302 is shortened in the direction perpendicular to the side surface of the shaft portion 301.

  Further, as shown in FIG. 3B, a claw portion 306 is provided on the other end side of the projecting portion 302 having the projecting portion 302 as one end side, and the shaft portions divided into two are fitted to each other. When the anchor bolt 300 is inserted, the claws 306 are not caught.

3C and 3D are views showing a state in which the protruding portion 302 is hooked on the stepped portion 23 in the second drilling portion.
As shown in FIG. 3C, when the protruding portion 302 moves in the central drilling portion 20 and reaches the second drilling portion 22, the wall surface of the central drilling portion 20 with which the tip of the protruding portion 302 abuts. , The elastic deformation of the shaft portion 301 is released, and the shaft portion 301 is restored to a linear shape, so that the protruding portion 302 is opened and engaged with the stepped portion 23.
At this time, as shown in FIG. 3D, the claws 306 can be fitted to each other, and the protruding portion 302 can be kept open.
Although not shown, the anchor bolt 300 is finally fixed by injecting a filler for fixing the anchor bolt into the gap between the anchor bolt 300 and the center hole portion 20 and the second hole portion 22.
By thus mechanically locking the protruding portion 302 to the stepped portion 23, it becomes possible to exhibit a stable resistance to pulling out against the pulling load applied to the anchor bolt 300.

Embodiment 4 FIG.
6 (a) to 6 (c) are diagrams showing, in chronological order, each stage when the post-fixed anchor bolt fixing structure and the fixing method according to the fourth embodiment of the present invention are implemented.
The drilling portion into which the anchor bolt 400 in the fourth embodiment is inserted is a drilling tool provided with the high-pressure water injection nozzle 13 in the second embodiment or the swing drill 15 shown in FIG. It is formed by the rotary head polisher 16 shown in FIG.

FIGS. 6A and 6B are diagrams in which the anchor bolt 400 is inserted into the excavated center hole portion 20. The anchor bolt 400 is provided with a widened portion 402 radially extending in a direction perpendicular to the side surface of the shaft portion 401 on the tip end side of the shaft portion 401. When the expanded portion 402 comes into contact with the bottom surface 24 of the second drilled portion 22 and is further pressed, the expanded portion 402 is radially plastically deformed and latched to the stepped portion 23 within the second drilled portion 22. It will be in the state.
FIG. 6C is a view in which the anchor bolt fixing filler 403 is injected into the gap between the anchor bolt 400 and the center hole portion 20 and the second hole portion 22 from the state of FIG. .
Thus, by expanding the expanded portion 402 and mechanically locking it to the stepped portion 23, it is possible to exhibit a stable adhering ability against a pulling load applied to the anchor bolt 400.

  DESCRIPTION OF SYMBOLS 1 Base material, 10 Drill, 11 axis | shaft, 12 Drilling rotation part, 13 High-pressure water injection nozzle, 14 Drilling blade, 15 Swing drill, 16 Rotary head polisher, 17 Rotary head, 20 Center drilling part, 21 1st cutting Hole, 22 Second drilling, 23 Step, 24 Bottom, 100, 200, 300, 400 Anchor bolt, 101, 201, 301, 401 Shaft, 102, 202 Locking, 103, 203, 403 Filling Material, 104, 204 Structure attachment member, 105, 205 Nut, 302 Protruding part, 306 Claw part, 402 Widening part.

Claims (14)

The anchor bolt fixing structure for fixing the anchor bolt to the existing base material drilling hole,
The anchor bolt has a linear shaft portion and a locking portion projecting in a direction perpendicular to the shaft portion at the tip of the shaft portion,
The excavation hole includes a first drilling portion opened on a surface of the base material,
A second drilled portion having a cross-section that is excavated in the deepest portion of the first drilled portion and expanded to form a stepped portion between the first drilled portion,
When the anchor bolt is fixed, the locking portion is inserted into the first drilling portion,
A fixing structure for a post-fixed anchor bolt, wherein the locking portion is latched to the stepped portion when the locking portion reaches the second drilling portion. The locking portion is a rectangular shape or an elliptical shape having a longitudinal direction and a short direction,
The first drilled portion is formed with a cross section having a long side and a short side,
When the anchor bolt is fixed, the longitudinal direction of the locking portion is inserted in parallel with the long side of the first drilling portion,
The anchor bolt is rotated around the shaft portion when the locking portion reaches the second drilled hole portion, and the longitudinal direction of the locking portion is latched to the stepped portion. The post-fixed anchor bolt fixing structure according to claim 1.   The post drilled anchor bolt according to claim 1 or 2, wherein the second drilled hole portion has a circular cross-sectional shape or a pair of fan-shaped cross-sectional shapes having a diameter larger than a short side of the first drilled hole portion. Fixed structure. The locking portion has a first shape that protrudes in a direction perpendicular to the side surface of the shaft portion, and a second shape that has a protrusion length smaller in the direction perpendicular to the side surface of the shaft portion than the first shape. Is configured to be deformable,
When the anchor bolt is fixed, the locking portion has a second shape and is inserted into the first drilling portion,
The stage according to claim 1, wherein when the locking portion reaches the second drilling portion, the locking portion is latched to the stepped portion by being deformed into the first shape. Fixed structure for post-cast anchor bolts.   The locking portion is a plurality of projecting portions formed by dividing the tip end of the shaft portion in the axial direction, exhibits the second shape by elastically deforming the divided shaft portion, and the elastic deformation is performed. 5. The post anchor bolt fixing structure according to claim 4, wherein the first shape is achieved by releasing the shape and the locking portion is latched to the stepped portion.   6. The fixing of a post-fixed anchor bolt according to claim 5, wherein a claw portion is provided on the other end side of the projecting portion with the projecting portion as one end side. Construction.   The locking portion is an expanded portion that can be radially deformed in a direction perpendicular to the shaft portion, and exhibits the second shape by making the expanded portion linear in the axial direction of the shaft portion. 5. The first shape is obtained by deforming the expanding portion radially in a direction perpendicular to the shaft portion, and the locking portion is latched to the stepped portion. Fixed anchor bolt fixing structure. The first drilled portion has a circular cross section,
8. The rear according to claim 4, wherein the second drilled portion has a circular cross-sectional shape or a pair of fan-shaped cross-sectional shapes having a diameter larger than the diameter of the first drilled portion. Fixed anchor bolt fixing structure.   The filler for anchor bolt fixation is inject | poured into the clearance gap between the said anchor bolt, the said 1st drilling part, and the said 2nd drilling part, The any one of Claims 1-8 characterized by the above-mentioned. Fixed anchor bolt fixing structure described in 1. A method for fixing a post-cast anchor bolt for fixing an anchor bolt to an existing base material drilling hole,
The anchor bolt has a linear shaft portion and a locking portion projecting in a direction perpendicular to the shaft portion at the tip of the shaft portion,
Step 1 for excavating a first drilling portion opened in the surface of the base material;
Excavating a second drilled portion having a cross section that has been drilled in the deepest portion of the first drilled portion and expanded to form a stepped portion between the first drilled portion; and
Inserting the locking portion into the first drilling portion; and
Step 4 for latching the latching portion to the stepped portion when the latching portion reaches the second drilling portion;
A fixing method for a post-fixed anchor bolt, comprising: The locking portion is a rectangular shape or an elliptical shape having a longitudinal direction and a short direction,
The first drilled portion is formed with a cross section having a long side and a short side,
In step 3, the longitudinal direction of the locking part is inserted in parallel with the long side of the first drilling part,
11. The post-fixing anchor bolt fixing according to claim 10, wherein in the step 4, the anchor bolt is rotated around the shaft portion and the longitudinal direction of the locking portion is latched to the stepped portion. Method. The locking portion has a first shape that protrudes in a direction perpendicular to the side surface of the shaft portion, and a second shape that protrudes in a direction perpendicular to the side surface of the shaft portion and is smaller than the first shape. And is configured to be deformable,
In the step 3, the locking portion is inserted into the first drilling portion as a second shape,
The fixing method of the post-placement anchor bolt according to claim 10, wherein in the step 4, the locking portion is latched to the stepped portion by being deformed into the first shape. In the step 1, a drilling tool having a pair of excavation rotating parts excavating the base material at the tip of a shaft is used, the excavation tool rotates the excavation rotating part, and the excavation rotating part is rotated around the axis. Forming the first drilled hole portion having a long side and a short side by penetrating into the base material without being rotated,
In the step 2, the circular excavation section having a diameter larger than the short side of the first drilling portion is obtained by rotating the excavation rotation portion of the excavation tool and rotating the pair of excavation rotation portions around the axis. 12. The post-fixed anchor bolt fixing method according to claim 10, wherein the second drilling portion having a shape or a pair of sector cross-sectional shapes is formed. In the step 1, a drilling tool having a pair of high-pressure water spray nozzles for drilling the base material at the tip of the shaft is used, the drilling tool sprays high-pressure water from the high-pressure water spray nozzle, and the high-pressure water Forming the first drilled portion having a long side and a short side by penetrating the base material without rotating the spray nozzle around the axis,
In the step 2, the excavation tool injects high-pressure water from the high-pressure water injection nozzle, and rotates the pair of high-pressure water injection nozzles about the axis, so that the short side of the first drilling portion The method for fixing a post-cast anchor bolt according to claim 10 or 11, wherein the second drilled hole portion having a circular cross-sectional shape having a larger diameter or a pair of fan-shaped cross-sectional shapes is formed.

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