JP3005389U - Anchor bolt - Google Patents

Abstract

(57) [Summary] [Purpose] In the anchor bolts that tightly connect the foundation and the foundation placed on the foundation, even if there are obstacles such as reinforcing bars inside the foundation, the portion protruding from the foundation is in the correct position. It is possible to install so that it comes close to. [Configuration] As the axis A ₂ of axis A ₁ and the bolt bottom 23 of the bolt top 21 is displaced a predetermined distance L, the anchor bolt 20
To form.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention uses anchor bolts, especially legs of steel or wooden columns, wooden foundations, etc., as the basis for concrete or reinforced concrete foundations, or steel truss trusses for reinforced concrete columns or walls. It relates to the anchor bolts used to do this.

[0002]

[Prior art]

 This type of conventional anchor bolt generally has a shape as shown in FIG. That is, in the anchor bolt 1, a bolt upper portion 4 having a threaded portion 3 to which a nut 2 is screwed is formed on an upper portion of a peripheral surface, and a bolt lower portion 5 embedded inside a foundation or the like on the same axis. It has a linearly extending shape. It is also generally known that a bent portion 6 is provided at the lower end of the lower portion 5 of the bolt in order to increase the resistance of the anchor bolt 1 against pulling out.

[0003]

[Problems to be solved by the device]

 Hereinafter, problems of the conventional anchor bolt will be described with reference to FIG. FIG. 6 shows a state in which the bolt 1 tightly connects the reinforced concrete cloth foundation 7 extending in the direction perpendicular to the paper surface and the wooden base 8 placed on the upper part of the cloth foundation 7 extending in the direction perpendicular to the paper surface. It is shown.

The cloth foundation 7 has reinforcing bars such as base bars 9, vertical bars 10 and horizontal bars 11 arranged therein, and after a mold (not shown) for pouring raw concrete is assembled, the cloth is placed in the mold. It is formed by pouring ready-mixed concrete. Before pouring fresh concrete, the anchor bolt 1 is installed at a predetermined position in the formwork so that the upper portion 4 of the bolt protrudes from the upper portion of the cloth foundation 7 after pouring the fresh concrete. At this time, there is a possibility that the reinforcing bar arranged in the form will be an obstacle and the anchor bolt 1 may not be installed at a predetermined position.

That is, the anchor bolt 1 is usually designed so that the portion protruding from the cloth foundation 7 is installed so as to pass through the center line C in the width direction of the cloth foundation 7 and the base 8. However, since the vertical streaks 10 and the horizontal streaks 11 are arranged in the widthwise central portion of the cloth foundation 7, when the anchor bolt 1 is installed at the widthwise center of the cloth foundation 7, the cloth of the anchor bolt 1 is The part embedded in the foundation 7 will interfere with these reinforcing bars. If you try to install the anchor bolt 1 at the center of the cloth foundation 7 in the width direction, you must bend the interfering rebar, and if you do so, the bar arrangement will be disturbed. Often.

When the anchor bolts 1 are thus displaced, when the base 8 is placed on the cloth foundation 7, the anchor bolts 1 are displaced from the center line C of the cloth foundation 7 in the width direction. It is necessary to measure whether each anchor bolt is installed and to form the bolt insertion hole 12 in the base 8 according to the displacement, so that the mounting work of the base 8 becomes very troublesome. Also, in order to correct the part of the anchor bolt 1 that is installed from the predetermined position and protrudes from the cloth foundation 7 so that it will come to the predetermined position after pouring fresh concrete, the concrete on the top of the cloth foundation 7 is shaved and the anchor In some cases, a part of the bolt 1 is exposed, the exposed part of the anchor bolt 1 is heated by a gas burner or the like to be bent and aligned, and then repair work for repairing scraped concrete is performed. However, such a work for repairing the table is not only time-consuming, and may reduce the strength of the anchor bolt 1, which is not preferable.

When installing anchor bolts, the reinforcing bar is not limited to the case where the wooden base is fixed to the foundation, and the case where the leg of the reinforcing bar is fixed to the foundation or the pillar is not limited to the case. In addition to rebar, various things such as electrical equipment and buried parts such as drainage can be considered, which can generally occur in various cases and hinder the installation of anchor bolts. Therefore, even if there are these obstacles, there is a strong demand to be able to install the part protruding from the foundation of the anchor bolt in a normal position without being affected by these obstacles.

The present invention has been made in view of the above circumstances, and an object thereof is to make a portion protruding from a foundation or the like come to a regular position even when an obstacle such as a reinforcing bar exists inside the foundation or the like. It is to provide an anchor bolt that can be installed in the.

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, the first anchor bolt of the present invention comprises a bolt upper part extending linearly and a bolt linearly extending at a position deviated from the axis of the bolt upper part by a predetermined distance substantially parallel to the axis. It is characterized by comprising a lower part and a connecting part for connecting a lower end of the upper part of the bolt and an upper end of the lower part of the bolt.

Further, in the second anchor bolt of the present invention, in addition to the configuration of the first anchor bolt, a bent portion is provided which extends from the lower end of the lower portion of the bolt in a direction away from the axis of the upper portion of the bolt. It is characterized by being.

The above-mentioned predetermined distance, that is, the distance between the axis of the upper part of the bolt and the axis of the lower part of the bolt is preferably 2 to 3 times the diameter of the anchor bolt in comparison with the diameter of the anchor bolt. Alternatively, the predetermined distance is preferably 2 to 5 cm.

The anchor bolt preferably has a diameter of 10 to 30 mm and a height of 30 to 70 cm.

These specific numerical values take into consideration the practicality of the anchor bolt, the ease of processing, and the like.

[0014]

[Effect of action and device]

 According to the first anchor bolt of the present invention, the axis line of the upper portion of the bolt and the axis line of the lower portion of the bolt are deviated from each other. Even if there is an obstacle, the lower part of the bolt can be prevented from interfering with the obstacle, so it is possible to install the upper part of the bolt so that it is in the proper position.

Even if an obstacle such as a reinforcing bar is displaced from the axis of the upper portion of the bolt and the lower portion of the bolt interferes with the obstacle when installing the anchor bolt, the upper portion of the bolt rotates about the axis. By doing so, the lower part of the bolt can be moved to an arbitrary position on the circumference with the distance from the axis of the upper part of the bolt as the radius, so it is possible to avoid obstacles easily. Therefore, even in this case, it is possible to install the anchor bolt so that the upper part of the bolt comes to the regular installation position.

The lower end of the anchor bolt may be provided with a bent portion for increasing the resistance to pulling out of the anchor bolt, but in the conventional anchor bolt, it does not matter in which direction the bent portion is bent. . However, in the present invention, when the bent portion is provided, the bending direction is important. That is, in the present invention, the axis of the bolt upper part of the anchor bolt and the axis of the bolt lower part are offset so that even if there is an obstacle such as a reinforcing bar on the axis of the bolt upper part, the anchor bolt does not interfere with the obstacle. Since it is characterized in that the bent portion can be installed, when the bent portion is provided, it is preferable to avoid the bent portion from entering the axis line of the upper portion of the bolt.

In the second anchor bolt of the present invention, since the bent portion is bent in a direction away from the axis of the upper portion of the bolt, even if the bent portion is provided, the function of avoiding the obstacle of the anchor bolt is not hindered.

[0018]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a perspective view schematically showing a structure of an anchor bolt according to an embodiment of the present invention, FIG. 2 is a view showing a usage state of the anchor bolt, and FIG. It is a figure which shows the position which can be taken.

As shown in FIG. 1, the anchor bolt 20 has a bolt upper portion 21 extending in a straight line and an axial line A ₂ parallel to the axial line A _{1 which} is deviated from the axial line A _{1 of} the bolt upper portion 21 by a predetermined distance L. It comprises a bolt lower portion 22 extending in a straight line, and a connecting portion 23 that obliquely connects the lower end of the bolt upper portion 21 and the upper end of the bolt lower portion 22. A bent portion 24 bent in a direction away from the axis A ₁ is formed at the lower end of the bolt lower portion 22, and a screw portion 26 to which a nut 25 is screwed is screwed on the upper peripheral surface of the bolt upper portion 21. ing. Note that reference numeral 27 in FIG. 1 indicates a washer plate.

As shown in FIG. 2, the anchor bolt 20 is composed of a reinforced concrete foundation 30 extending in a direction orthogonal to the plane of the paper, and a wooden construction extending in a direction orthogonal to the plane of the paper placed on the foundation 30. It is intended to be tightly connected to the base 40 of, and specifically, the diameter is 12 mm, the height H (see FIG. 1) is 35 to 40 cm, and the axis A of the bolt upper part 21₁And bolt bottom 22 axis A ₂ The distance L from the deviation is set to 3 cm.

The cloth foundation 30 shown in FIG. 2 has reinforcing bars such as base bars 31, vertical bars 32, and horizontal bars 33 extending in a direction orthogonal to the plane of the paper, and is used for forming a concrete frame (not shown). ) Is assembled and then poured by pouring fresh concrete into a formwork etc. The anchor bolt 1 is installed so that the axis A _{1 of the} upper portion 21 of the bolt overlaps the center line C of the cloth foundation 30 in the width direction before pouring the ready-mixed concrete. The vertical bars 32 and the horizontal bars 33 are arranged in the center of the cloth foundation 30 in the width direction, but the anchor bolt 20 has no trouble because the bolt lower part 22 does not interfere with these reinforcing bars, and the bolt upper part 21 It is possible to install so that the axis line A _{1 of} and the center line C of the fabric foundation 30 overlap.

After the base 40 has a bolt insertion hole 41 passing through the center in the width direction thereof, the base 40 is placed on the cloth foundation 30 as shown in the drawing, and the nut 25 is attached to the anchor bolt 20 via the washer plate 27. It is tightly connected to the cloth foundation 30 by being screwed to the upper end.

As shown in FIG. 3, when the anchor bolt 20 is to be installed as shown in FIG. 2 and the lower part 22 of the bolt interferes with other embedded objects other than the reinforcing bar, as shown in FIG. Since the position of the bolt lower part 22 with respect to the bolt upper part 21 can be changed to any position on the circumference of the radius L centering on the bolt upper part 21, avoiding embedded objects by moving the position of the bolt lower part 22. As a result, the upper part 21 of the bolt can be installed while maintaining its proper position.

FIG. 4 shows another embodiment of the present invention. The anchor bolt 20A shown in FIG. 4 is used to tightly connect the column 50 made of reinforced concrete and the steel column 60 placed on the top of the column 50. Specifically, the diameter is 19 mm to 22 mm, The height is 50-60 cm, and the axis deviation between the bolt upper part 21 and the bolt 22 is set to 4 cm.

Inside the pillar 50, a main bar 51 extending in the height direction of the pillar 50 (vertical direction in the figure) and a band bar 52 interconnecting the main bar 51 are arranged. 20A is a normal position where the axis A ₁ of the bolt upper portion 25 overlaps with the center line C _{1 of} the bolt insertion hole (not shown) formed in the base plate 61 of the steel column 60 without interfering with these reinforcing bars. It is installed so that it can be touched.

Although the embodiments of the present invention have been described above, the present invention is not limited to the specific modes of the embodiments, and it goes without saying that various modifications can be made.

[Brief description of drawings]

FIG. 1 is a perspective view of an anchor bolt according to an embodiment of the present invention.

FIG. 2 is a view showing a usage state of the anchor bolt shown in FIG.

FIG. 3 is a diagram showing a positional relationship between a bolt upper portion and a bolt lower portion.

FIG. 4 is a view showing a use state of an anchor bolt according to another embodiment of the present invention.

FIG. 5 is a perspective view of a conventional anchor bolt.

FIG. 6 is a view showing a usage state of a conventional anchor bolt.

[Explanation of symbols]

 20, 20A Anchor bolt 21 Bolt upper part 22 Bolt lower part 23 Connecting part 24 Bending part 25 Nut 30 Cloth foundation 40 Base 50 Column 60 Steel column

Claims (6)

[Scope of utility model registration request] 1. A bolt upper portion that extends linearly, a bolt lower portion that linearly extends at a position deviated from an axis of the bolt upper portion by a predetermined distance substantially parallel to the axis, a lower end of the bolt upper portion and the bolt lower portion. An anchor bolt, comprising: a connecting portion that connects the upper end of the anchor bolt. 2. The anchor bolt according to claim 1, further comprising a bent portion that is bent and extends from a lower end of the lower portion of the bolt in a direction away from an axis of the upper portion of the bolt. 3. The anchor bolt according to claim 1, wherein the predetermined distance is 2 to 3 times the diameter of the anchor bolt. 4. The anchor bolt according to claim 1, wherein the predetermined distance is 2 to 5 cm. 5. Anchor bolt according to claim 1, characterized in that it has a diameter of 10 to 30 mm. 6. The anchor bolt according to claim 1, wherein the height is 30 to 70 cm.