JP6321875B1 - Anchor bolt and fixing method using anchor bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fix two members with one anchor bolt.
A bolt body 110 of an anchor bolt 100 is formed with a normal screw 112 at one end and a reverse screw 111 at the other end. A hexagonal flange 160 is slidably attached to the hexagonal column 110D between the normal screw 112 and the reverse screw 111. First and second cylindrical portions 120 and 130 that can be expanded are inserted into both ends of the bolt body 110. On the inner wall surfaces of the first and second piece members 140 and 150, female screws 111 and 112 that are engaged with the normal screw 112 and the reverse screw 111 are formed, respectively. End portions 144 and 154 of the first and second piece members 140 and 150 are inserted into gaps between the bolt main body 110 and the first and second cylindrical portions 120. As the bolt body 110 rotates, the first and second piece members 140 and 150 are attracted to each other, and the first and second cylindrical portions 120 and 130 expand.
[Selection] Figure 1

Description

  The present invention relates to an anchor bolt, and more particularly, to an expandable anchor bolt used when installing a stone or the like.

Conventionally, various methods have been taken to install a monument made of stone on a pedestal.
15 and 16 show a typical example of a conventional technique for fixing the monument 2 to the pedestal 3 or the like.
As shown in these drawings, when installing the monument 2 on the pedestal 3, the mounting surface (lower surface) 2A on the monument 2 side and the mounting surface (pedestal upper surface 3A) on the pedestal 3 side are mounted in advance with mounting holes (insertion holes) 2B, 2B, mounting holes (insertion holes) 3B, 3B are formed, and each of the insertion holes 2B, 2B, insertion holes 3B is filled with the adhesive 5 in the mounting holes (insertion holes) 2B, 2B, 3B, 3B. , 3B, a method of inserting the joining bolt 10 and fixing the monument 2 and the pedestal 3 with the adhesive 5 and the joining bolt 10 is proposed.
For example, in Japanese Patent Application Laid-Open No. 7-34431, when fixing a stone to a fixing member, an adhesive is filled into the anchor hole of the stone and the upper end of an anchor bolt attached in advance to the fixing member is inserted into the anchor hole. Thus, a technique for fixing the stonework and the fixing member with an adhesive is disclosed.

In this method, a plurality of joint rods 6, 6, 6, 6 are disposed in advance at predetermined positions on the pedestal upper surface 3A, and the adhesive 5 is applied to the pedestal upper surface 3A (FIG. 15). Moreover, the adhesive 5 is also filled in the mounting holes 3B and 3B provided in the pedestal upper surface 3A.
The adhesive holes 5 are also filled in the mounting holes 2B and 2B on the lower surface 2A of one monument 2.

  Adhesive 5 enters a gap provided between the pedestal upper surface 3A and the lower surface 2A of the monument 2 by the joint rod 6, and the lower surface 2A of the monument 2 and the pedestal upper surface 3A are connected to the joining bolt 10 and the adhesive 5 It will be fixed more firmly.

FIG. 17 shows a method of joining the monument 2 and the pedestal 3 using a cut anchor 20 (FIG. 17A) instead of the joining bolt 10.
In this method, the cut anchor 20 is embedded in the mounting hole 3B on the pedestal 3 side using the dedicated driving rod 21 (FIG. 17B), and the female screw 20C formed on the inner wall surface of the cut anchor 20 is screwed. The male screw 22C of the bar 22 is screwed and attached (FIG. 17C), and the screwed screw bar 22 is inserted into the mounting hole 2B of the monument 2 prefilled with the adhesive 5, and the monument. 2 is fixed to the pedestal upper surface 3A (FIGS. 17D and 18).

Further, instead of the cut anchor 20, one end of the anchor bolt 30 (FIG. 19) or anchor bolt 40 (FIG. 20) is fixed to the mounting hole 3B on the base 3 side, and the other end (the bolt body of the anchor bolt 30). A method of fixing the monument 2 to the pedestal 3 by inserting a metal fitting 41) attached to the screw portion 31A 31 and the head 40A of the anchor bolt 40 into the mounting holes 2B and 2B filled with the adhesive 5 in advance. Are known.
Regarding the anchor bolt 30, in Japanese Patent Laid-Open No. 7-26633, the cylindrical screw portion is inserted into the mounting hole, the cylindrical screw portion is screwed into the nut, and the nut is rotated, thereby forming a cylindrical shape. An anchor bolt is disclosed in which the threaded portion is pulled up, and at this time, the expanded portion provided outside the cylindrical threaded portion expands. As the expanded portion expands in the circumferential direction with respect to the shaft center, the anchor bolt is firmly fixed to the mounting hole.
In addition, with regard to the expandable anchor bolt 40, Japanese Patent Application Laid-Open No. 2003-90173 inserts one end of a tapered nut screwed into the bolt between the bolt and the collar. The anchor bolt which raises a nut by rotating and expands a collar is indicated.

  In any case using the cut anchor 20 and the anchor bolts 30 and 40, one installation surface (the pedestal upper surface 3A side in FIGS. 15 and 16) is firmly fixed by the anchor bolt, but the other installation surface is installed. In any case, the surface (the lower surface 2A side of the monument 2) is joined by the adhesive 5 prefilled in the mounting holes, the pedestal upper surface 3A, or the adhesive 5 applied to the lower surface 2A of the monument 2. Yes.

JP 7-34431 A

JP-A-7-26633

JP 2003-90173 A

However, even when any of the conventional joining bolt 10, the cut anchor 20, and the anchor bolts 30 and 40 is used, the adhesive 5 is always used on at least one joining surface. Occurs.
That is, in any of the above-described methods, the strength of the joint necessary for installation is ensured, but when an unexpected swing occurs, for example, when the vertical swing due to a large earthquake or the like is larger than expected, FIG. As shown in the example fixed by the anchor 20), the monument 2 may move up and down as indicated by the black arrow and may come off the base 3.
This is because, in the structure in which the bonding bolts and the like are fixed with the adhesive 5, the bonding bolts and the like may come off from the solidified adhesive 5 if the vertical swing (up and down movement) exceeds the unexpected. Yes, as long as the adhesive 5 is used, it is difficult to improve the bonding strength in the vertical direction.

In addition, the adhesive 5 is known to have reduced bonding strength due to aging due to its characteristics. In the state where the adhesive strength is reduced due to this aging deterioration, if a vertical shake exceeding the expected value occurs due to a large earthquake or the like, the monument 2 may be more easily detached.
Further, if rolling occurs frequently while the solidified adhesive 5 has deteriorated over time, a gap is formed between the bonding bolt 10 and the adhesive 5 and the rolling continues, and the gap gradually increases. May be. When this rolling is repeated, excessive stress is applied by the shearing force applied to the joining bolt 10 or the like, and the resistance of the joining bolt 10 or the like is reduced.

The present invention has been made in view of such circumstances, and even when a vertical vibration that far exceeds the assumption occurs, the bonding strength such that monuments and the like are not likely to be detached from the installation surface. It is an object of the present invention to provide an anchor bolt that secures the above.
It is another object of the present invention to provide an anchor bolt that can sufficiently maintain the bonding strength between the installation target and the installation surface even when a long time has passed.
In addition, when the diameter of the mounting hole to be installed such as a monument is formed larger than the diameter of the mounting hole formed on the installation surface, mounting holes having different diameters are formed on the installation surface and the installation target. Even if it is a case, it makes it a subject to provide the anchor bolt which can fix an installation object firmly to an installation surface.

In order to achieve the above object, the anchor bolt according to the first invention of the present application has a normal screw or a reverse screw formed at one end and a reverse screw or a normal screw formed at the other end, and between the normal screw and the reverse screw. A bolt body provided with a rotating part, a first expandable cylinder part into which the one end of the bolt body is inserted, and an expandable part in which the other end of the bolt body is inserted. A second cylinder portion, a first piece member having a cylindrical inner wall surface formed with a female screw to be engaged with a normal screw or a reverse screw of the bolt main body, and a cylindrical inner wall surface of the bolt main body. The second piece member is formed with a female screw that is screwed with a reverse screw or a normal screw. The first piece and the second piece member have opposite end portions on the bolt body and the first piece. The rotating portion of the bolt body inserted into each gap generated between the first cylindrical portion and the second cylindrical portion. With the rotation, in the first frame member and the second frame member and an anchor bolt which is attractable configured to each other in the axial direction of the bolt body, the rotating unit includes a circumferential cross-section Is formed into a polygonal shape, and a hollow flange portion that engages the polygonal surface and the inner wall surface is fitted into the rotating portion so as to be slidable in the axial direction of the bolt body, and the first piece member Is configured such that the degree of expansion of the first cylinder part is greater than the degree of expansion of the second cylinder part by the second piece member .

Further, in the second invention of the present application, the first piece member is formed in a tapered shape in which an outer peripheral surface tapers from an outer side in the axial direction of the bolt body toward the center, and the axial member is formed on the center side. A first tapered portion whose cross-sectional shape increases in thickness toward the outer side in the axial direction of the bolt body is formed, and the axial cross-sectional shape increases more rapidly than the first tapered portion on the outer side in the axial direction. 2 of the tapered portion that are formed.

According to a third aspect of the present invention, at least one notch is formed in the first piece member, and the notch is opened along with the rotation of the bolt main body, so that the outer peripheral surface of the piece member is in the circumferential direction. It spreads out.

According to 1st invention of this application, as for the 1st, 2nd piece member, the edge part of the mutually opposing side is respectively between a volt | bolt main body, the said 1st cylinder part, and the said 2nd cylinder part. Since the first piece member and the second piece member can be attracted to each other in the axial direction of the bolt body as they are inserted into the generated gaps and the turning portion of the bolt body is turned. , Ru can firmly fix the two members with one of the anchor bolt.

Further, even when the diameter of one mounting hole of the two members is larger than the diameter of the mounting hole formed in the other member, these two members are firmly secured with one anchor bolt. Can be fixed to.

Further , according to the second invention of the present application , the first piece member is formed in a tapered shape whose outer peripheral surface tapers from the outer side in the axial direction of the bolt body toward the center. However, if they are attracted to each other while being inserted into the gap between the bolt main body and the first cylindrical portion, the degree of expansion of the first cylindrical portion increases smoothly.

According to the third invention of the present application, the first piece member is formed with at least one notch so that the outer peripheral surface of the piece member expands in the circumferential direction as the bolt body rotates. As the bolt main body rotates, the piece member itself that expands the twelfth cylindrical portion is also expanded, and the degree of expansion of the cylindrical portion can be further increased.

Embodiments of the present invention will be described below.
FIG. 1 is a perspective view showing an anchor bolt 100 according to the present invention.
As shown in FIG. 1, the anchor bolt 100 includes a bolt body 110, first and second cylindrical portions (cylinder portions) 120 and 130, and a tapered first taper whose outer peripheral surface tapers inward. The second piece members 140 and 150 and a hexagonal flange (hexagonal flange) 160 are included.

  The anchor bolt 100 configured in this manner has both side ends (first cylindrical portion 120, second cylindrical portion 130) having mounting holes (insertion holes) provided in an installation target (monument) and an installation surface ( The first piece member 140 and the second piece member 150 are attracted to each other by rotating the bolt main body 110 while being inserted into the mounting holes (insertion holes) provided in the base). The piece members 140 and 150 are configured such that the outer end portions 120A and 130A of the first cylindrical portion 120 and the second cylindrical portion 130 are expanded in the circumferential direction.

Therefore, the outer end portions 120A and 130A of the first and second cylindrical portions 120 and 130 are the mounting holes formed in the installation target (monument) and the inner wall surfaces of the mounting holes formed in the installation surface (the pedestal upper surface). Will grip.
When the bolt body 110 is further rotated while the outer end portions 120A and 130A grip the inner wall surface of the mounting hole, the gripping force is strengthened, and the first piece member 140 and the second piece member 150 are further attracted. As a result, the object to be installed (monument) and the installation surface (upper surface of the base) are attracted to each other while the grip force is strengthened.

FIG. 2 is an exploded perspective view for explaining details of each part of the anchor bolt 100.
As shown in this figure, the bolt body 110 of the anchor bolt 100 has a first screw portion 110A in which a reverse screw (male screw) 111 is formed and a second screw portion in which a normal screw (male screw) 112 is formed. A threaded portion 110B is provided, and between these portions (the portion where the screw is not cut) is a hexagonal (polygonal) column portion (hexagonal column portion) 110D. In addition, this hexagonal column part 110 </ b> D is a rotating part of the bolt main body 110.
Further, the tip of the bolt main body 110 on the first screw portion 110 </ b> A side is a tapered cylindrical portion 110 </ b> C for expanding the first piece member 140.

The hexagonal flange 160 is inserted into the hexagonal column part 110 </ b> D at the center of the bolt main body 110 so as to be freely movable, and is slidable in the axial direction of the bolt main body 110.
When the hexagonal flange 160 is rotated, the hexagonal column portion 110D is also rotated in the circumferential direction (rotation of the bolt body 110).
The first and second cylindrical portions 120 and 130 are provided with positioning protrusions 121, 121, 131, and 131 at end portions (inner end portions) 120 </ b> B and 130 </ b> B from the center.
The positioning protrusions 121, 121, 131, 131 are formed on the first and second cylindrical portions 120, 130 by bending.

Among these, positioning protrusions 131 and 131 are positioning grooves 3C and 3C on the pedestal upper surface 3A side when one end of the anchor bolt 100 is installed on the pedestal upper surface (installation surface) 3A, as will be described later (see FIG. 11). And the anchor bolt 100 and the mounting holes 3B and 3B are aligned. On the other hand, the positioning protrusions 121 and 121 are fitted into alignment grooves 2C and 2C provided on the lower surface 2A of the monument 2 so that the anchor bolt 100 and the mounting holes 2B and 2B are aligned.
Note that the positioning projections 121, 121, 131, 131 are arranged so that the first and second cylindrical portions 120, 130 are located relative to the monument 2 and the pedestal 3 even when the bolt body 110 is rotated when the anchor bolt 100 is tightened. It also functions as a stopper to prevent relative rotation.

In addition, guide grooves 122, 122, 132, 132 are also formed in the first and second cylindrical portions 120, 130, respectively.
The protrusions 142, 142, 152, 152 on the first and second piece members 140, 150 side are engaged with the guide grooves 122, 122, 132, 132.
As a result, even when the bolt main body 110 rotates and the first and second piece members 140 and 150 are attracted to each other, the first and second cylindrical portions 120 and 130 and the first and second piece members 140 are drawn. , 150 are not relatively rotated.
As a result, even when the bolt main body 110 is rotated, the first piece member 140 and the second piece member 150 are attracted to each other inside the first and second cylindrical portions 120 and 130. .

Expansion slits 123, 123, 133, and 133 are formed in the first and second cylindrical portions 120 and 130, respectively.
By providing the expanding slits 123, 123, 133, and 133, as will be described in detail later, when the first piece member 140 and the second piece member 150 are attracted to each other in the axial direction, the first, The outer end portions 120A and 130A of the second cylindrical portions 120 and 130 expand in the circumferential direction.
Further, the first piece member 140 is formed with widening slits 143, 143, 143, and 143. As will be described in detail later, the inner wall surface of the first piece member 140 is a taper of the bolt body 110. It spreads by insertion of the cylindrical part 110C (FIGS. 4 and 5 described later).

Although the size of the anchor bolt 100 is not particularly limited, in this embodiment, the axial length of the bolt body 110 is 102 mm, the lengths of the first and second screw portions 110A and 110B are both 33 mm, hexagonal The length of the column part 110D is 36 mm, and the opposite side is 8 mm.
The first and second cylindrical portions 120 and 130 have a length of 32 mm, an outer diameter of 13.5 mm, an inner diameter of 10.5 mm, a width of 2 mm of the positioning protrusions 121, 121, 131 and 131, and the protrusions 121, 121 and 131. , 131 protruding from the outer peripheral surface, the guide grooves 122, 122, 132, 132 have a width of 2.2 mm, a length of 23 mm, and the widening slits 123, 123, 133, 133 have a width of 1 mm and a length of 23 mm. It has become.

The first and second piece members 140 and 150 have an outer diameter of 13.5 mm on the outer side, an outer diameter of 10 mm on the center side, and a length of 1.5 mm protruding from the outer peripheral surface of the protrusions 142, 142, 152 and 152. The thickness is 1 mm.
The hexagonal flange 160 has an inner diameter of 8 mm, an outer diameter of 17 mm, and a thickness of 5 mm.

Next, using FIG. 3, the operation (attracting operation) of the first and second piece members 140 and 150 accompanying the rotation of the bolt body 110 will be described.
As described above, the first and second piece members 140 and 150 do not rotate in the circumferential direction with respect to the first and second cylindrical portions 120 and 130.
The first and second cylindrical portions 120 and 130 do not rotate with respect to the installation target (monument 2) and the installation surface (pedestal upper surface 3A) by the action of the positioning protrusions 121, 121, 131, and 131. . As a result, the first and second piece members 140 and 150 also do not rotate with respect to the installation target (monument 2) and the installation surface (pedestal upper surface 3A).

In this state, when the bolt body 110 is rotated in the direction of the arrow in FIG. 3A, the first piece member 140 and the second piece member 150 are in the directions indicated by the white arrows in FIG. Move (attract).
When the first piece member 140 and the second piece member 150 are attracted to each other (FIG. 3B), the first and second cylindrical portions 120 and 130 are expanded (not shown in the drawing).
When the drawing progresses and one piece member (second piece member 150 in the illustrated example) cannot move in the axial direction (the second cylindrical portion 130 grips the inner wall of the mounting hole), a further bolt body With the rotation of 110, the bolt body 110 starts to move rightward in FIG. 3C (black arrow).
At this time, as long as the first piece member 140 is movable, the first piece member 140 is attracted to the second piece member 150 side by the rotation of the bolt body 110 (FIG. 3C ) White arrow).

Next, the configuration and operation of the first expansive piece member 140 according to the present invention will be described with reference to FIGS. 4 and 5.
As described above, the slits 143, 143, 143, and 143 for expansion are formed in the first piece member 140 (FIGS. 1 and 2).
As shown in FIG. 4, the first piece member 140 is functionally divided into a first region 140A and a second 140B.
Among these, the inside of the first region 140A has a cylindrical shape with a constant diameter, but the inside of the second region 140B has a tapered shape in which the diameter decreases toward the outside in the axial direction of the bolt body 110. (FIG. 4A).
Since the first piece member 140 has a tapered shape in which the outer peripheral surface widens outward and the inner wall narrows outward, the degree of increase in the thickness of the second region 140B is the first region. It becomes larger than the degree to which the thickness of 140A increases.

  Since the degree of increase in the thickness of the first piece member 140 is two stages different between the first region 140A and the second 140B, the first piece member 140 has a first step as shown in FIG. When the wall surface 140a of the first region 140A and the wall surface 140b of the second 140B are flush with each other, the degree of increase in the thickness of the first piece member 140 becomes steep from the substantially central portion to the outside.

FIG. 5 is a cross-sectional view showing a state where the bolt main body 110 is actually screwed to the first piece member 140 having the above configuration.
Before the anchor bolt 100 is tightened, the male screw 111 of the bolt main body 110 and the female screw 141 of the first piece member 140 are kept in a state of being screwed about two to three times (FIG. 5A). ).
When the anchor bolt 100 is inserted into an attachment hole (not shown) and the bolt main body 110 is rotated, the male screw 111 of the bolt main body 110 is further screwed with the female screw 141 of the first piece member 140, One screw portion 110A moves to the left end portion in the drawing of the first region 140A of the first piece member 140 (FIG. 5B).
When the bolt main body 110 is further rotated from this state, the tapered cylindrical portion 110C of the bolt main body 110 spreads the tapered surface of the second 140B in the circumferential direction, and the inner wall 140a of the first region 140A and the second The inner wall 140b of 140B becomes flush, and the outer periphery of the first piece member 140 spreads extremely at the approximate center (FIG. 5C).

Next, the expansion operation | movement of the anchor bolt 100 accompanying rotation of the volt | bolt main body 110 is demonstrated using FIGS.
As described above, the first and second piece members 140 and 150 and the first and second cylindrical portions 120 and 130 do not rotate relative to each other, and the first and second cylindrical portions 120 are not rotated. , 130 is prevented from rotating with respect to the installation object (2) and the installation surface (pedestal 3).
The anchor bolt 100 is inserted into the first and second cylindrical portions 120 and 130 at both ends of the bolt main body 110 before tightening (FIG. 6). The female screw 141 of the first piece member 140 is lightly screwed with the male screw 112 and the female screw 151 of the second piece member 150, and is maintained in a tightenable state (FIG. 7).

When the bolt main body 110 is rotated from this state (rotation in the direction of the arrow in FIG. 7), the male screw (reverse screw) 111 on the bolt main body 110 side and the female screw 141 of the first piece member 140 are screwed together at one end side. Since the male screw (positive screw) 112 on the bolt body 110 side and the female screw 151 of the second piece member 150 are screwed together at the other end side, the first and second piece members 140 and 150 are It moves in the axial direction so as to attract each other (from the state of FIG. 7 to the state of FIG. 8).
When the first and second piece members 140 and 150 are attracted, the end portions 144 and 154 of the piece members enter the gap between the bolt main body 110 and the first and second cylindrical portions 120 and 130, and the first and second pieces The two cylindrical portions 120 and 130 both start to expand.

When the bolt body 110 is further rotated in the direction of the arrow in the drawing from the state shown in FIG. 8, the first and second piece members 140 and 150 are further attracted, and the end portions 144 and 154 thereof are connected to the bolt body 110. The gap between the first cylindrical part 120 and the gap between the bolt main body 110 and the second cylindrical part 130 are further expanded (FIG. 9).
When at least one cylindrical portion (second cylindrical portion 130 in FIG. 9) grips and locks the inner wall surface of the mounting hole (not shown), the axial direction of the piece member (second piece member 150) Movement is restricted (cannot move freely).

If the bolt main body 110 is further rotated from the state shown in FIG. 9, the movement of one piece member (second piece member 150) is prohibited (actually, it is bitten into the gap by further tightening). This time, the bolt body 110 starts to move in the right direction in FIG. 9 inside the anchor bolt 100 (from the state of FIG. 9 to the state of FIG. 10).
At this time, the first piece member 140 moves to the right in the axial direction with respect to the bolt main body 110 by screwing the female screw 141 and the male screw 111, but the bolt main body 110 itself also moves to the right in the axial direction. The degree of movement of one piece member 140 in the axial direction (right direction in the drawing) inside the anchor bolt 100 increases.
As a result, the degree of entry into the gap at the end 144 of the first piece member 140 increases, and the degree of expansion of the first cylindrical part 120 also increases.

Further, as described above, the first piece member 140 is provided with the expanding slits 143, 143, 143, and 143, and further, the inner wall 140a of the first region 140A is tapered toward the outside. Due to the shape (see FIGS. 4 and 5), the first piece member 140 itself expands in the circumferential direction, and therefore the degree of expansion of the first cylindrical portion 120 is further increased.
Thus, by making the degree of expansion on the first cylindrical part 120 side larger than the degree of expansion on the second cylindrical part 130 side, one end of the anchor bolt 100 (first cylindrical part 120). Side) is inserted into a large-diameter mounting hole (insertion hole), and the other end (second cylindrical portion 130 side) is inserted into a small-diameter mounting hole (insertion hole). Can be secured.

Next, using the anchor bolt 100 according to the present invention, the monument (installation target) 2 is actually fixed to the pedestal upper surface (installation surface) 3A, and the pedestal (installation target) 3 is further fixed to the concrete upper surface (concrete installation surface) 4A. The method of fixing to will be described with reference to FIGS.
In fixing the monument 2 to the pedestal upper surface 3A, first, the joint rod 6 (thickness 6 mm and larger than the thickness 5 mm of the hexagonal flange 160) is arranged at a predetermined position on the pedestal upper surface 3A (in the example shown, 4 )
Next, the anchor bolt 100 is inserted into the mounting holes 3B, 3B provided in advance on the pedestal upper surface 3A. In this example, the second cylindrical portion 130 side of the anchor bolt 100 is inserted (FIG. 12A). At this time, the positioning protrusions 131 and 131 and the positioning grooves 3C and 3C are fitted.
In this state, while aligning the positions of the pedestal 3 and the monument 2, the monument 2 is lowered (FIGS. 11 and 12B), and the first cylindrical portion 120 side of the anchor bolt 100 is attached to the mounting hole of the monument 2. (Insertion hole) Insert into 2B, 2B. At this time, the positioning protrusions 121 and 121 are fitted into the alignment grooves 2C and 2C.

When the descending of the monument 2 to the pedestal upper surface 3A is finished, a gap for tightening work is provided between the pedestal upper surface 3A and the lower surface 2A of the monument 2 by the joint rods 6, 6, 6 and 6 arranged on the pedestal upper surface 3A. (About 6 mm) is ensured (FIG. 12C).
By providing a clearance for the tightening operation in this way, the hexagon flange 160 (thickness 5 mm) of the anchor bolt 100 is positioned in the clearance, and this is rotated by a tool such as a spanner. be able to.
Since the hexagonal flange 160 is slidable in the axial direction of the bolt body 110, the hexagonal flange 160 is always left in the gap even if the center of the anchor bolt 100 is out of the gap secured by the joint rod 6. The bolt body 110 can be turned.

When the hexagonal flange 160 is rotated clockwise in FIG. 11 by using a tool such as a spanner (not shown), a male screw (positive screw) 112 of the bolt body 110 and a female screw 151 of the second piece member 150 The second piece member 150 is pulled upward in the figure by screwing.
On the other hand, since the male screw (reverse screw) 111 of the bolt main body 110 is screwed with the female screw 141 of the first piece member 140, the first piece member 140 is pulled down in the drawing.
As a result, the first piece member 140 and the second piece member 150 are attracted in the vertical direction in FIGS.
When the first piece member 140 and the second piece member 150 are attracted to each other, the end portions 144 and 154 of the first piece member 140 and the second piece 150 are connected to the bolt main body 110 and the first and second cylinders. The gaps between the first and second cylindrical portions 120 and 130 are pushed into the gap between the first and second cylindrical portions 120 and 130 in the circumferential direction (FIG. 12D).

When the hexagonal flange 160 is further rotated in the clockwise direction, the expansion of the second cylindrical portion 130 inserted in the mounting holes 3B and 3B is maximized, and the outer end portion 130A of the second cylindrical portion 130 becomes the mounting hole 3B. , 3B is gripped (FIG. 12E).
Here, in the central portion of the inner wall of the mounting holes 3B, 3B, a diameter-enlarged recess 3F for enhancing the grip effect by the second cylindrical portion 130 is provided, whereby the outer end portion 130A of the second cylindrical portion 130 is provided. Is fitted into the enlarged-diameter recess 3F, and the bonding force is increased.
At this time, the movement of the second piece member 150 inside the anchor bolt 100 is restricted (substantially prohibited).

If the hexagonal flange 160 is further rotated in a state where the movement of the second piece member 150 (upward movement in FIG. 12) is restricted, the second piece member 150 continues to rise. The bolt main body 110 moves downward in the anchor bolt 100 by screwing the female screw 151 of the second piece member 150 and the male screw 112 of the bolt main body 110.
Further, since the female screw 141 of the first piece member 140 is screwed with the male screw 111 of the rotating bolt body 110 (FIG. 9), the first piece member 140 descends in the anchor bolt 100. Keep doing.
In this way, the bolt main body 110 itself is lowered, and the first piece member 140 is further lowered with respect to the bolt main body 110, so that the first piece member 140 has a gap between the bolt main body 110 and the first cylindrical portion 120. The degree of penetration increases, and the expansion operation of the first cylindrical portion 120 increases.

As a result, even when the opening diameter of the mounting hole 2B into which the first cylindrical portion 120 is inserted is larger than the other mounting hole 3B, the installation target (monument 2) and the installation surface (the pedestal upper surface) can be obtained with one anchor bolt 100. 3A) can be firmly fixed.
Here, also in the central portion of the inner wall of the mounting holes (insertion holes) 2B, 2B, a diameter-enlarged recess 2F is provided to enhance the grip effect by the outer end 120A of the first cylindrical portion 120, thereby the outer end 120A. Is fitted into the enlarged-diameter recessed portion 2F, and the coupling force is increased.
In particular, in the anchor bolt 100, the first piece member 140 itself is configured to be expanded by the rotation of the bolt body 110, and further, in the first region 140A of the first piece member 140. In comparison, since the taper of the cross-sectional shape of the second 140B is made steep, the first piece of the expansion type from the time when the first screw portion 110 abuts on the tapered inner wall 140b of the second 140B. The degree of expansion of the member 140 is increased (FIGS. 5B to 5C), and the degree of expansion of the first cylindrical portion 120 is further increased.

  As described above, the anchor bolt 100 according to the present invention is different in the degree of expansion (expansion) in the circumferential direction between the first cylindrical portion 120 and the second cylindrical portion 130 (the direction of the first cylindrical portion 120). When the diameters of the mounting holes (insertion holes) 2B, 2B of the monument 2 and the mounting holes (insertion holes) 3B, 3B of the pedestal 3 are different as in this embodiment, Even if the cylindrical part expands and grips in the mounting hole, the other cylindrical part continues to expand, so when mounting holes with different diameters are formed on the installation target and the installation surface However, it is possible to firmly join the anchor bolt 100.

The anchor bolt 100 is also used when the base 3 is fixed to the concrete installation surface 4A (FIG. 11).
In this case, four mounting holes 3E, 3E, 3E, 3E are provided on the lower installation surface 3D of the pedestal 3, and the mounting holes 4E, 4E, 4E, 4E are also provided on the concrete installation surface 4A.
In addition, joint rods 6, 6, 6 and 6 are provided between the installation surface 3D and the concrete installation surface 4A, and a clearance (work clearance 6 mm) is ensured between the installation surface 3D and the concrete installation surface 4A. Is done.
When installing the pedestal 3 on the concrete installation surface 4A, the pedestal is aligned with one end of the anchor bolt 100 (on the first cylindrical portion 120 side) inserted into the mounting holes 4E, 4E, 4E, 4E. 3 may be lowered from above (FIG. 11).
Thereafter, the base 3 can be firmly installed on the concrete installation surface 4 </ b> A by the anchor bolt 100 by rotating the hexagonal flange 160 clockwise in the same procedure as in the case of installing the monument 2.

As described above, in this embodiment, when the monument 2 is installed on the pedestal 3, both can be firmly fixed by the anchor bolt 100, so that the monument 20 can be moved upward (in the direction of pulling out) with respect to the pedestal 30. Even when a force is applied, the anchor bolt 100 firmly grips and locks the wall surface of the mounting hole 2B of the monument 20, so that the anchor bolt 100 can be attached to the monument 2 or the like even if a large unexpected vertical swing occurs. There is no possibility of coming off in the vertical direction with respect to the base 3.
Further, since no adhesive is used, it is not necessary to consider aging degradation.
Further, since the monument 20 is firmly fixed not only in the vertical direction but also in the horizontal direction, even if slight lateral movement (vibration) occurs continuously, there is no “displacement”, and the anchor bolt Resistance to 100 shear forces is also improved.

In the anchor bolt 100 of this embodiment, only the first piece member 140 can be expanded. However, as shown in FIG. 13, the expansion pieces 153, 153 and 153 are also formed in the second piece member 150. 153 and 153 may be formed so that the structure can be expanded.
In this embodiment, the hexagonal flange 160 is inserted into the hexagonal column portion 110D of the bolt main body 110, and the bolt main body 110 is rotated by rotating the hexagonal flange 160. As shown in FIG. 14, the hexagonal column 110 </ b> D may be directly rotated by the spanner 8 without providing the hexagonal flange.

In the above-described embodiment, the bolt main body 110 is a cylinder, but other cross-sectional shapes (for example, a polygon) may be used as long as a male screw can be formed.
In the above-described embodiment, the driving portion (hexagonal column portion 110D) of the bolt main body 110 and the flange (hexagonal flange 160) inserted into the bolt main body 110 are hexagonal, but the bolt main body 110 can be rotated. Any other shape (other polygons) may be used.

In the above-described embodiment, an example in which a reverse screw is formed on the first screw portion 110A and a positive screw is formed on the second screw portion is shown. However, a positive screw and a second screw are formed on the first screw portion 110A. Of course, a reverse screw may be formed in the screw portion. In this case, it goes without saying that the normal and reverse of the female screw 141 of the first piece member 140 and the female screw 151 of the second piece member 150 are reversed.
Further, in the above-described embodiment, the expanding cylindrical portion is a cylinder, but if it can be expanded and the mounting hole (insertion hole) to be installed can be gripped, a hollow polygonal column or the like can be used. It may be configured.

It can be used not only for fixing stones such as monuments, but also for joining concrete and stone, and concrete.
Furthermore, as long as attachment holes (insertion holes) can be formed on the two joining surfaces, it is needless to say that the anchor bolt of the present invention can be used for joining any other material such as wood or plastic.

It is a perspective view which shows the whole structure of the anchor bolt 100 which concerns on this invention. 2 is an exploded perspective view of an anchor bolt 100. FIG. It is explanatory drawing which shows the motion of the axial direction of the bolt main body 110 and the piece members 140 and 150 of the anchor bolt 100. FIG. It is sectional drawing which shows the internal shape of the piece member. It is sectional drawing which shows the function of the piece member 140 when the volt | bolt main body 110 rotates. 3 is a perspective view showing how to assemble the anchor bolt 100. FIG. It is the perspective view and sectional drawing which show the state of the anchor bolt 100 before fastening. It is the perspective view and sectional drawing which show the state of the anchor bolt 100 in the middle of fastening. FIG. 6 is a perspective view and a cross-sectional view showing a state of the anchor bolt 100 when the expansion operation of the second cylindrical portion 130 by the piece member 150 is finished. FIG. 6 is a perspective view and a cross-sectional view showing the state of the anchor bolt 100 at the time when the expansion operation of the first cylindrical portion 120 by the piece member 140 is also completed. It is a perspective view which shows the example which fixes the monument 2, the base 3, the base 3, and the concrete installation surface 4A using the anchor bolt 100 which concerns on this invention. FIG. 6 is a cross-sectional view for explaining the action of the anchor bolt 100 when the monument 2 is fixed to the base 3. It is a perspective view which shows the anchor bolt which provided the slit for expansion also in the 2nd piece member, and was made to expand. It is a perspective view which shows the method of rotating an anchor bolt with the spanner 8 without providing the hexagonal flange 160. FIG. It is a perspective view which shows the method of fixing the monument 2 to the base 3 using the adhesive agent 5 and the joining bolt 10 conventionally performed. It is sectional drawing which shows a mode that the monument 2 by the adhesive agent 5 and the bolt 10 for joining is fixed to the base 3. FIG. It is a figure which shows a mode that the monument 2 is fixed to the base 3 using the conventional cut anchor 20. FIG. It is sectional drawing which shows a mode that the monument 2 is fixed to the base 3 using the conventional cut anchor 20. FIG. It is a figure which shows the anchor bolt 30 which can be used when fixing the monument 2 to the base 3. FIG. It is a figure which shows the anchor bolt 40 which can be used when fixing the monument 2 to the base 3. FIG. It is sectional drawing which shows a mode that the monument 2 fixed to the base 3 remove | deviates from the base 3 by pitching.

2 monuments (targets for installation)
2A Bottom surface 3 Base 3A Top surface (Installation surface)
4A Concrete Installation Surface 5 Adhesive 6 Joint Rod 100 Anchor Bolt 110 Bolt Main Body 110A First Threaded Part 110B Second Threaded Part 111, 112 Male Thread 120 First Cylindrical Part (First Cylindrical Part)
120A, 130A Outer end portion 130 Second cylindrical portion (second cylindrical portion)
140 First piece member 141 Female screw 144 End portion 150 Second piece member 151 Female screw 154 End portion 160 Hexagon flange (flange portion)

Claims (3)

A bolt body in which a normal screw or a reverse screw is formed at one end, a reverse screw or a normal screw is formed at the other end, and a rotation part is provided between the normal screw and the reverse screw;
An expandable first tube portion into which the one end of the bolt body is inserted;
An expandable second tubular portion into which the other end of the bolt body is inserted;
A first piece member in which a female screw to be screwed with a normal screw or a reverse screw of the bolt body is formed on a cylindrical inner wall surface;
A second piece member formed on the cylindrical inner wall surface with a female screw that is screwed with a reverse screw or a normal screw of the bolt body;
The first and second piece members are inserted into respective gaps formed between the bolt main body, the first cylindrical portion, and the second cylindrical portion, with the end portions facing each other.
With the anchor bolt configured so that the first piece member and the second piece member can be attracted to each other in the axial direction of the bolt body, as the turning portion of the bolt body rotates.
The rotating portion is formed in a polygonal cross-sectional shape in the circumferential direction,
A hollow flange portion that engages the polygon and the inner wall surface is fitted into the rotating portion so as to be slidable in the axial direction of the bolt body.
The first piece member is configured such that the degree of expansion of the first cylinder part is greater than the degree of expansion of the second cylinder part by the second piece member. The anchor bolt is a feature. The first piece member is formed in a taper shape with an outer peripheral surface tapering from the outer side in the axial direction of the bolt body toward the center,
On the center side, a first taper portion in which the cross-sectional shape in the axial direction increases in thickness toward the outer side in the axial direction of the bolt body is formed,
The second taper portion having a thickness that is sharply increased from the first taper portion toward the outer side in the axial direction is formed on the outer side in the axial direction. The anchor bolt according to 1. At least one notch is formed in the first piece member, and the notch is opened as the bolt body rotates, so that the outer peripheral surface of the piece member is expanded in the circumferential direction. anchor bolt according to claim 1 or claim 2,.