JP2507641Y2 - Anchor bolt - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anchor bolt, and more particularly, to an anchor bolt that facilitates replacement work.

[0002]

2. Description of the Related Art As is well known, anchors are often used as a means for fixing instruments, plates and the like to concrete and mortar layers. As an example thereof, there is an anchor having a bar-shaped main body having a plurality of stepped blade portions.
More specifically, the blade portion has a gentle taper from the lower portion to the upper portion of the anchor, and the edge portion on the upper side has a step shape with an acute angle. That is, when driving the anchor, the anchor enters the inside of the concrete or mortar layer along a gentle taper. Then, when a force is applied in the pulling-out direction of the anchor, the edge portion forming an acute angle of the blade portion bites into the concrete or mortar layer to prevent the anchor from coming off.

In addition, as an example, the actual exploitation of Sho 61-1931
Anchor as disclosed in Japanese Patent No. 49 has been proposed. That is, the lower portion of the bar-shaped steel material having a total length set to about 40 to 50 times the diameter is cut at an acute angle to separate it into an upper half portion and a lower half portion, and a connecting portion is provided at a part of the cut portion. It is an anchor characterized in that the lower end of the half part is formed with a non-acute angle.

According to the above anchor, a hole is made in the concrete or mortar layer, and the anchor is inserted and driven into this hole. When the anchor stops entering due to the above-mentioned driving, pressure is applied to the acute-angled cutting site, the partially joined part of the cutting site is disengaged, and the upper and lower parts are displaced along the cutting plane to cause a discrepancy, resulting in an acute-angled edge of the cutting site. The portion projects outward in diameter and bites into the peripheral wall surface, and frictional resistance occurs around the cut portion, and thus resistance in the direction of pulling out the anchor occurs.

[0005]

According to the above-mentioned conventional technique, in the anchor of the first example, the acute-angled edge portion of the blade portion bites into the peripheral wall surface, and resistance is generated in the direction of pulling out the anchor. This can prevent the anchor from coming off. Furthermore,
In the anchor of the second example, at the same time that the acute-angled edge portion of the cut portion bites into the peripheral wall surface, at the same time, frictional resistance is generated around the cut portion, which has the advantage that the anchor can be prevented from coming off. It has some drawbacks in terms.

That is, in the anchor of the first example, when it is driven, depending on the amount of driving, the anchor enters by one side and the frictional resistance that acts as a resistance in the direction of pulling out the anchor is not averaged. Was not always stable. Furthermore, when replacing the anchor that has been driven in, it is difficult to pull out the anchor because biting of the blades of the anchor on the peripheral wall surface of the acute-angled edge becomes a resistance.

In the anchor of the second example, when the driven anchor is replaced, the anchor is pulled out due to the bite on the peripheral wall surface of the sharp edge of the cut portion and the frictional resistance around the cut portion. Was difficult.

Therefore, the object of the present invention is to make the frictional resistance between the anchor and the peripheral wall in the direction of pulling out the anchor evenly apply to the entire anchor to improve the stability of the anchor with respect to the peripheral wall surface. An object of the present invention is to provide a technique capable of relatively easily pulling out the anchor when replacing the anchor.

[0009]

[Means for Solving the Problems] In order to achieve the above object,
The present invention has the following technical means. That is, the present invention will be described with reference to the reference numerals in the accompanying drawings corresponding to the embodiments. In the present invention, the lock is divided into an upper half 2 and a lower half 3 with a cutting portion 10 cut at an acute angle as a boundary. In the anchor having the portion 4, the lock portion 4 is formed in a tubular shape, and the bolt portion 6 having the screw portion 7 is passed through as an axis, and the upper half portion 2 and the lower half portion of the lock portion 4 are also provided. A state in which there is a lock portion movement gap J between the inner peripheral surfaces 2a, 3a of the bolt 3 and the outer peripheral surface 6a of the bolt portion 6, and the screw portion 7 of the bolt portion 6 is located above the lock portion 4. The anchor bolt is characterized in that a nut 9 is attached thereto, and on the other hand, below the bolt portion 6, a stopper portion 8 for preventing the lock portion 4 from falling off from the bolt portion 6 is formed.

Further, in the anchor having the lock portion 4 divided into the upper half portion 2 and the lower half portion 3 with the cut portion 10 cut at an acute angle as a boundary, the lock portion 4 has a tubular shape. The bolt portion 6 having the screw portion 7 is passed through as a shaft, and the inner peripheral surface a of the upper half portion 2 and the bolt portion 6 of the lower half portion 2 and the lower half portion 3 of the lock portion 4 are also passed. Has a lock portion movement gap J between it and the outer peripheral surface 6a, and a nut 9 is attached to the screw portion 7 of the bolt portion 6 while being positioned above the lock portion 4, while the lower half portion is provided. 3 is a bolt portion 6
It is an anchor bolt that is fixed to the.

Another feature is that the anchor bolt 1 has a lock portion 4 which is divided into an upper half portion 2 and a lower half portion 3 with a cutting portion 10 cut at the acute angle as a boundary. A plurality of units are provided, and the boundary surface 13 between the adjacent lock units 4 is a surface perpendicular to the longitudinal direction of the lock unit 4.

[0012]

With the above structure, how to use it will be described. A first hole 11 for inserting the anchor bolt is made at a predetermined position of concrete or mortar layer. The second hole 1 is also provided at a predetermined position of the device 19 or the like to be fixed with the anchor bolt 1 to the concrete or mortar layer.
Leave 5 open.

Next, the lock portion 4 of the anchor bolt 1 is pushed into the first hole 11 formed in the concrete or mortar layer. At the same time, the bolt portion 6 is passed through the second hole 15 formed in the device 19 or the like. After this, the bolt part 6
Attach the nut 9 to and tighten.

Then, the pressure due to the tightening of the nut 9 is transmitted to the lock portion 4 via the instrument 19 and the like. Pressure is applied to the cutting portion 10 of the lock portion 4 by tightening the nut 9. That is, in the first device, the lock portion 4 is
2 between the nut 9 and the stopper 8
In the second invention, the upper half portion 2 has a nut 9 and a bolt portion 6
It is in a state of being sandwiched between the lower half part 2 fixed to the. Then, the upper half portion 2 and the lower half portion 3 are arranged along the cut surface of the cutting portion 10.
Are different from each other. Due to this discrepancy, the sharp edge portion 12a of the upper half portion 2 and the sharp edge portion 12b of the lower half portion 3 advance toward the peripheral wall surface 11a of the first hole 11, and at the same time, the upper half portion 2
And the outer peripheral surface 2 of the lower half 3 on the side of the acute-angled edges 12a, 12b.
b and 3b are in close contact with the peripheral wall surface 11a of the first hole 11.

[0015]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. 1 to 11 show an anchor bolt 1 according to the first embodiment, which includes a rod-shaped bolt portion 6, a lock portion 4 located on the outer peripheral side of the bolt portion 6, and a nut 9 attached to the bolt portion 6. It consists of and. The upper portion of the bolt portion 6 is threaded, and this is referred to as a screw portion 7. Further, a stopper portion 8 for receiving the lock portion 4 is formed at the tip of the bolt portion 6. That is, the stopper portion 8 has a diameter equivalent to the outer diameter of the lock rod 4, and prevents the lock portion 4 from falling out of the bottle portion 6. Further, the tip surface 8a of the stopper portion 8 is
When the anchor bolt 1 is pushed into the first hole 11 formed in the concrete layer 16, it comes into contact with the bottom portion of the first hole 11 and prevents the rotation of the bolt portion 6 due to the rotation of the nut 9 by frictional force. Is.

The lock portion 4 has a cylindrical shape and is divided into an upper half portion 2 and a lower half portion 3 with a cutting portion 10 cut at an acute angle as a boundary. That is, the upper half portion 2 and the lower half portion 3 are in contact with each other by the cut surfaces 10a and 10b. Then, the edges forming the acute angles of the upper half portion 2 and the lower half portion 3 of the cutting portion 10 are referred to as acute-angled edge portions 12a and 12b. The lock part 4
Has an inner diameter slightly larger than the diameter of the outer peripheral surface of the bolt portion 6, and the inner peripheral surfaces 2a and 3a of the upper half portion 2 and the lower half portion 3 of the lock portion 4 and the outer peripheral surface 6a of the bolt portion 6, respectively. A lock portion movement gap J is defined between the two. The lock portion movement gap J is such that the upper half portion 2 and the lower half portion 3 can move toward the peripheral wall surface 11a when the upper half portion 2 and the lower half portion 3 are misaligned at the cutting portion 10 and are displaced from each other. It is a gap for Further, the upper end surface 2c of the upper half portion 2 and the lower end surface 3c of the lower half portion 3 are surfaces perpendicular to the longitudinal direction of the lock portion 4. This is because when the nut 9 is tightened, the pressure thereof is easily applied to the cut portion 10 of the lock portion 4.

Next, the nut 9 attached to the screw portion 7 of the bolt portion 6 has a stopper portion 8 of the bolt portion 6.
And the nut 9, the lock portion 4 is attached. Then, the nut 9 is rotated to move in the direction of the lock portion 4, and pressure is applied to the lock portion 4.

Next, how to use the anchor bolt 1 will be described. Here, the case where the fixture 19 and the like are fixed to the concrete layer 16 by using the anchor bolt 1 will be considered. On the surface of the concrete layer 16, a middle finish 17 and a finish 18 on the surface of the middle finish 17 are stretched.

First, a first hole 11 for inserting the anchor bolt is made at a predetermined position of the concrete layer 16. Then, with the anchor bolt 1, the concrete layer 16
The second hole 15 is also made at a predetermined position of the device 19 to be fixed to the.

Next, the lock portion 4 of the anchor bolt 1 is pushed into the first hole 11 of the concrete layer 16. At the same time, the bolt portion 6 is inserted into the second hole 15 of the device 19.
Pass through. After that, the spring washer 20 and the nut 9 are attached to the bolt portion 6 and tightened.

The pressure due to the tightening of the nut 9 is transmitted to the lock portion 4 via the instrument 19. Pressure is applied to the cutting portion 10 of the lock portion 4 by tightening the nut 9, and the upper half portion 2 and the lower half portion are along the cutting surface 10a of the upper half portion 2 and the cutting surface 10b of the lower half portion 3. It is different from 3. Due to this discrepancy, the acute edge portion 12a of the upper half portion 2 and the acute edge portion 12b of the lower half portion 3 form the peripheral wall surface 11 of the first hole 11.
advance to a. At the same time, the outer peripheral surface 2b of the upper half 2 on the acute-angled edge 12a side closely contacts the peripheral wall surface 11a, and the outer peripheral surface 3b of the lower half 3 on the acute-angled edge 12b side closely contacts the peripheral wall surface 11a.

In other words, referring to FIGS. 1 and 2, before tightening the nut 9, the outer peripheral surface 2b of the nut 9 is fixed to the bolt portion 6.
The lock portion 4 is located at a position away from the central axis N of the
The upper half portion 2 and the lower half portion 3 are displaced in opposite directions by a distance S toward the peripheral wall surface 11a and press the peripheral wall surface 11a. The distance S moved by the lock portion 4 is a radial distance J1 of the lock portion movement gap J. Above distance J1
Is a distance that is half the difference between the inner diameter of the lock portion 4 and the outer diameter of the bolt portion 6.

That is, the lock portion 4 is sandwiched between the nut 9 and the stopper portion 8 by tightening the nut 9, and the pressure is applied to the cutting portion 10 of the lock portion 4. At this time, the rotation of the bolt portion 6 due to the rotation of the nut 9 is prevented by the friction between the tip surface 8a of the stopper portion 8 and the bottom portion of the first hole 11. Since the cutting portion 10 is cut at an acute angle, the pressure applied to the cutting portion 10 causes the sharp edge portions 12a and 12b of the upper half portion 2 and the lower half portion 3 to move outward. Dispersed in the direction. At this time, since the upper half 2 and the lower half 3 are movable due to the existence of the lock portion movement gap J, the upper half 2 and the lower half 3 are staggered. After the upper half 2 and the lower half 3 are moved,
The upper half 2 is on the surface on one side of the inner wall surface 11a of the first hole 11,
The lower half portion 3 is pressed against the other surface of the inner wall surface 11a of the first hole 11. When the anchor bolt 1 is replaced, the nut 9 may be loosened and then pulled out. As will be understood from the above description, the diameter of the hole 11 previously formed in concrete or the like is such that the anchor bolt 1 is in the locked state as shown in FIG.
Determine so that a can be pressed. Therefore, the above-described movement amount S can be variously set, and can be set to the same distance as the maximum distance J1 in FIG.

Next, a second embodiment will be described with reference to FIGS. 12 to 17. In this embodiment, substantially the same parts as in the first embodiment are omitted, and only different parts will be described.
That is, in this example, the inner peripheral surface 3a of the lower half portion 3 of the lock portion 4 and the outer peripheral surface 6a of the bolt portion 6 corresponding to the inner peripheral surface 3a are threaded so that the lower half portion 3 is bolted. It is in a state of being fixed to the bolt portion 6 so as not to move in the direction at right angles to. That is, when tightening the nut 9,
The upper half portion 2 is sandwiched between the nut 9 and the lower half portion 3 fixed to the bolt portion 6, and pressure is applied to the cutting portion 10. Then, at the cutting portion 10 of the lock portion 4, a discrepancy occurs between the upper half portion 2 and the lower half portion 3, and the upper half portion 2 is
The acute-angled edge portion 12a moves in the advancing direction, and the lower half portion 3
Moves in a direction of pressing the peripheral wall surface 11a of the first hole 11 together with the bolt portion 6. Further, in this example, the stopper portion 8 is not provided. In the above embodiment, the lower half portion 3 and the bolt portion 6 may be integrally molded.

Next, a third embodiment will be described with reference to FIGS. 18 to 20. In this example, when the lock portion 4 divided into the upper half portion 2 and the lower half portion 3 with the cutting portion 10 cut at the acute angle as a boundary is taken as one unit, a plurality of lock portions 4 are provided as one unit. It is provided. The boundary surface 13 between the adjacent one unit of the lock portions 4 forms a surface perpendicular to the longitudinal direction of the lock portion 4. And, at the time of use, the upper half 2 and the lower half 3 of each of the plurality of locks 4 are used.
However, the sharp-edged edge portions 12a and 12b move outward, and the upper half portion 2 and the lower half portion 3 of each lock portion 4 press the inner wall surface 11a of the first hole 11.

Next, a fourth embodiment will be described with reference to FIGS. 21 and 22. That is, in this example, the bolt portion 6
The convex portion 14 is formed at the tip of the stopper portion 8. The convex portion 14 is formed across the diameter direction of the stopper portion 8, and when the anchor bolt 1 is pushed into the first hole 11, the convex portion 14 bites into the bottom portion of the first hole 11. State, and the bolt portion 6 due to the rotation of the nut 9
Is more reliably prevented from rotating. The convex portion 14 may be a convex portion 14 having another shape that can prevent the rotation of the bolt portion 6.

Thus, in the example of the anchor bolt 1,
Although an example of attaching the device 19 or the like to the concrete layer 16 is shown, in addition to this, the bolt portion 6 is extended and bent to attach another binding member to the bolt portion 6, and the anchor bolt 1 is attached. It may be fixed to the concrete layer 16 or the like.

As described above, according to the anchor bolt 1, when the nut 9 is tightened, the upper half portion 2 and the lower half portion 3 of the lock portion 4 are misaligned with each other, and the upper half portion 2 and the lower half portion 3 are separated from each other. At the same time when the acute-angled edge portions 12a and 12b advance outward and bite into the inner wall surface 11a of the first hole 11,
By the outer peripheral surfaces 2b and 3b of the upper half 2 and the lower half 3 respectively pressing against the inner wall surfaces 11a in opposite directions,
Resistance of the anchor bolt 1 in the pull-out direction, that is,
The resistance caused by the biting of the acute-angled edge portions 12a and 12b and the frictional resistance between the inner wall surface 11a of the upper half portion 2 and the lower half portion 3 are generated, and it is possible to prevent the anchor bolt 1 from coming off, and of course, the anchor. If you want to replace the bolt 1, simply loosen the nut 9 and the anchor bolt 1
It is relatively easy to pull out.

[0029]

As described above in detail, the present invention provides the features of claim 1.
According to 2, the tightening of the nut causes a discrepancy between the upper half portion and the lower half portion of the lock portion, and the resistance due to the biting of the hole of the acute-angled edge portion of the lower half portion into the peripheral wall surface and the upper half portion and It causes frictional resistance between the outer peripheral surface of the lower half and the peripheral wall surface of the hole, and of course prevents the anchor bolt from coming off.
Since the outer peripheral surfaces of the upper half part and the lower half part are pressed in opposite directions, pressure is evenly applied from the anchor bolt to the peripheral wall surface of the hole, and the stability of the anchor bolt against the peripheral wall surface in the hole is improved. It is relatively good, and if you want to replace the anchor bolt, you can easily pull out the anchor bolt by simply loosening the nut, which reduces the pressing force on the peripheral wall surface of the lock part. is there. Therefore, it is more suitable for locking and unlocking the temporary work.

Further, according to the third aspect, by providing the plurality of lock portions, the upper half portion and the lower half portion of each of the plurality of lock portions bite into the peripheral wall surface to prevent the anchor bolt from being pulled out. A stronger resistance is obtained, and the contact area with the peripheral wall surface of the upper half and the lower half increases,
Stronger frictional resistance against pulling out of the anchor bolt is obtained.

[Brief description of drawings]

FIG. 1 is a view showing a use state of a first embodiment of an anchor bolt according to the present invention.

FIG. 2 is a view showing a state in which the anchor bolt of the present invention is pushed into the hole of the first embodiment.

FIG. 3 is a vertical cross-sectional side view taken along the line CC of FIG. 6 of the first embodiment of the anchor bolt according to the present invention.

FIG. 4 is a front view of a first embodiment of an anchor bolt according to the present invention.

FIG. 5 is a right side view of the first embodiment of the anchor bolt according to the present invention.

FIG. 6 is a left side view of the anchor bolt according to the first embodiment of the present invention.

FIG. 7 is a rear view of the first embodiment of the anchor bolt according to the present invention.

FIG. 8 is a plan view of a first embodiment of an anchor bolt according to the present invention.

FIG. 9 is a bottom view of the first embodiment of the anchor bolt according to the present invention.

FIG. 10 is a cross-sectional view taken along the line AA of FIG. 4 of the first embodiment of the anchor bolt according to the present invention.

FIG. 11 is a cross-sectional view taken along line BB of FIG. 4 of the first embodiment of the anchor bolt according to the present invention.

FIG. 12 is a view showing a usage state of a second embodiment of the anchor bolt according to the present invention.

FIG. 13 is a vertical cross-sectional side view taken along line FF of FIG. 15 of the second embodiment of the anchor bolt according to the present invention.

FIG. 14 is a front view of a second embodiment of the anchor bolt according to the present invention.

FIG. 15 is a right side view of a second embodiment of the anchor bolt according to the present invention.

16 is a cross-sectional view of the second embodiment of the anchor bolt of the present invention taken along the line DD in FIG.

17 is a cross-sectional view of the second embodiment of the anchor bolt of the present invention taken along the line EE of FIG.

FIG. 18 is a front view of a third embodiment of the anchor bolt according to the present invention.

FIG. 19 is a right side view of a third embodiment of the anchor bolt according to the present invention.

20 is a vertical cross-sectional front view of the anchor bolt according to the third embodiment of the present invention taken along the line GG in FIG.

FIG. 21 is a view of a fourth embodiment of the anchor bolt according to the present invention.

FIG. 22 is a bottom view of a fourth embodiment of the anchor bolt according to the present invention.

[Explanation of symbols]

 1 Anchor bolt 2 Upper half 2a Inner peripheral surface of lower half 3 Lower half 3a Circumferential surface of lower half 4 Lock part 6 Bolt part 6a Outer peripheral surface of bolt part 7 Screw part 9 Nut 10 Cutting part 13 Boundary surface

Claims (3)

(57) [Scope of utility model registration request] 1. An anchor having a lock portion 4 divided into an upper half portion 2 and a lower half portion 3 with a cutting portion 10 cut at an acute angle as a boundary, wherein the lock portion 4 has a tubular shape. The bolt portion 6 having the screw portion 7 is passed through as a shaft, and the inner peripheral surfaces 2a and 3a of the upper half portion 2 and the lower half portion 3 of the lock portion 4 and the bolt portion 6 are also formed.
Has a lock portion movement gap J between it and the outer peripheral surface 6a, and a nut 9 is attached to the screw portion 7 of the bolt portion 6 while being positioned above the lock portion 4, while
An anchor bolt characterized in that a stopper portion 8 for preventing the lock portion 4 from falling off from the bolt portion 6 is formed below the bolt portion 6. 2. An anchor having a lock portion 4 divided into an upper half portion 2 and a lower half portion 3 with a cut portion 10 cut at an acute angle as a boundary, wherein the lock portion 4 has a tubular shape. The bolt portion 6 having the screw portion 7 is passed through as a shaft, and the inner peripheral surface 2a of the upper half portion 2 and the bolt portion 6 of the upper half portion 2 and the lower half portion 3 of the lock portion 4 are also passed. Has a lock portion movement gap J between it and the outer peripheral surface 6a, and a nut 9 is attached to the screw portion 7 of the bolt portion 6 above the lock portion 4, while the lower half The anchor bolt is characterized in that the portion 3 is fixed to the bolt portion 6. 3. The anchor bolt 1 has a plurality of units of a lock portion 4 which is divided into an upper half portion 2 and a lower half portion 3 with a cutting portion 10 cut at the acute angle as a boundary, The boundary surface 13 between the adjacent one unit of the lock portions 4 is
2. A surface perpendicular to the longitudinal direction of the.
The described anchor bolt.