JP2013087452A - Snake insert anchor bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a snake insert anchor bolt which can be mounted so as not to come into contact with a reinforcing-bar being present at a mounting position of a concrete structure with the reinforcing-bar embedded therein.SOLUTION: In a snake insert anchor bolt 10, an anchor body 12 can be inserted into a mount hole 38 provided in a mold form 36 prior to concrete casing of a concrete structure 30 with a reinforcing-bar 32 embedded therein. The anchor body 12 includes an internal thread 20 mounted on the same plane as a mounting surface of the concrete structure 30, a first bent portion 22 which is formed by bending an end portion of the internal thread 20, a first shaft 24 extending from the first bent portion 22, a second bent portion 26 which is formed by bending a terminal portion of the first shaft 24, and a second shaft 28 extending from the second bent portion 26. The internal thread 20 is characterized by that an axial center is formed linear and that the anchor body 12 can be inserted while being revolved from the outside of the mount hole 38 to the side of the reinforcing-bar 32.

Description

  The present invention relates to a snake insert anchor bolt that can be attached between rebars of a concrete structure in which reinforcing bars are embedded before the concrete is placed.

Conventionally, as an anchor fixing method for attaching an anchor bolt to a concrete structure in which a reinforcing bar is embedded, a front-end method and a retrofitting method are known.
The pre-casting method consists of assembling the concrete bolts after assembling the reinforcing bars constituting the concrete structure or after assembling the formwork around the reinforcing bars and before pouring concrete into the formwork. It is a method of fixing at the same time.

  On the other hand, in the post-installation method, concrete is poured into the above-mentioned formwork, a concrete structure with a predetermined strength or higher is formed after the curing period, and then a hole is made in the concrete surface and anchored in this hole. This is a method of fixing bolts.

  An anchor bolt disclosed in Patent Document 1 is an anchor bolt used in a tipping method, and includes a screw for nut screwing formed on an upper end portion of a casing, and a shaft of the casing over a predetermined length at a lower end portion of the casing. And a wave-like bent portion bent in a wave-like manner. According to the anchor bolt having such a structure, even when the reinforcing bar in the lateral direction of the concrete structure is already arranged at a position along the axis of the anchor bolt to be embedded, the anchor bolt is appropriately rotated about the axis of the anchor bolt. Thus, the anchor bolt can be installed without shifting the position of the reinforcing bar by matching the concave portion of the wave-like bent part with the reinforcing bar.

Japanese Utility Model Publication No. 6-54803

  FIG. 5 is an explanatory view of a conventional insert anchor bolt. As shown in the figure, the conventional insert anchor bolt 1 has a linear axis. When constructing such an insert anchor bolt 1 at a construction location where the reinforcing bar 2 and the formwork 3 are combined, if it is a location such as point A that is inserted from the mounting hole 4a and does not contact the reinforcing rod 2, attach it. Can do. However, when the reinforcing bar 2 exists on a straight line that passes through the mounting hole 4b and is orthogonal to the mounting surface as shown by the point B, the insert anchor bolt 1 and the reinforcing bar 2 are in contact with each other and can only be inserted halfway. It cannot be installed. In this case, the construction location of the insert anchor bolt 1 is moved to a location where it does not encounter the rebar 2, and the design change has been forced.

  An example of a concrete structure is a hospital. There are various measuring machines, instruments and medicine shelves in the hospital. To prevent overturning due to earthquakes, etc., measuring machines, instruments, and chemical shelves are sometimes fixed to concrete structures such as ceilings, walls, and floors. When the object to be fixed is heavy, it is necessary to fix it firmly. An anchor bolt that can be fixed even when a reinforcing bar exists on a straight line that passes through the mounting hole and is orthogonal to the mounting surface is desired.

  Also, the anchor bolt is easier to position after enclosing the reinforcing bar 2 with the mold 3 as shown in FIG. In this case, the space surrounded by the mold 3 cannot be seen from the outside, and it cannot be determined whether or not the reinforcing bar 2 exists on the axis of the mounting hole. Therefore, when a reinforcing bar exists on the axis of the mounting hole, the mounting hole is formed by shifting the position again. Since the anchor bolt disclosed in Patent Document 1 has a long casing and a wave-like bent portion, the anchor bolt cannot be inserted from the mounting hole of the formwork. Moreover, since the recessed part of a wavelike bending part is formed in multiple numbers, possibility that it will contact with a reinforcing bar becomes high when rotating.

  Then, an object of this invention is to provide the snake insert anchor bolt which can be attached so that it may not contact with the reinforcing bar which exists in the attachment location of the concrete structure which embedded the reinforcing bar.

  The snake insert anchor bolt of the present invention is a snake insert anchor bolt capable of inserting an anchor main body into a mounting hole provided in a formwork of a concrete structure in which a reinforcing bar is embedded, before the concrete is placed. A female thread portion that can be mounted on the same plane as the mounting surface of the concrete structure, a first bent portion obtained by bending an end of the female screw portion, a first shaft extending from the first bent portion, and the first shaft. And a second shaft extending from the second bent portion. The female screw portion has a straight axis, and the anchor body is formed from the outside of the mounting hole. It is characterized by being able to be inserted while rotating toward the reinforcing bar side.

In this case, when the anchor main body is arranged on the Z ₁ axis of the X ₁ Y ₁ Z ₁ axis perpendicular to each other, the center of the first bent portion is in the X ₁ axis direction with respect to the X ₁ Y ₁ plane. from .theta.1 ° to Y ₁ axially, .theta.2 ° bent relative to the X ₁ Y ₁ plane to -Z ₁ axially to form the first shaft, perpendicular to the center of the second bent portion from each other X ₂ when placed in Y ₂ Z ₂ axes _{Z 2 axial,} .theta.3 ° from _{the X 2} axis direction having the same direction as the θ1 relative to X 2 _{Y 2} plane to _{Y 2} axially, the _X 2 _{Y 2} plane bent .theta.4 ° to -Z ₂ axially relative to form the second shaft, said θ1~θ4 is, 0 ° <| θ1, θ2 , θ3, θ4 | that was set in the range of <90 ° It is a feature.

The anchor body, in a plan view in X ₁ Y ₁ Z ₁ and arranged on Z ₁ axes of X ₁ Y ₁ plane perpendicular to the axis of said first bent portion to each other, around the female threaded portion As described above, the rotation to the Z ₁ axis and the tip of the second shaft is set within 1/4 rotation.
The first shaft or the second shaft is characterized in that an axial core is formed in a linear shape or a curved shape.

  According to the snake insert anchor bolt of the present invention, even if a reinforcing bar exists on a line passing through the attachment hole and orthogonal to the attachment surface, it can be easily attached. Moreover, since it forms in a substantially S shape by side view so that a reinforcing bar may be wound from an attachment hole, while increasing a contact area with concrete, tensile strength can be raised.

  Therefore, even in the case of a concrete structure such as a hospital where a reinforcing bar exists on a straight line that passes through the mounting hole and is orthogonal to the mounting surface, various measuring machines, instruments, medicine shelves, etc. are easily and have the prescribed strength. Can be fixed while.

It is construction sectional drawing of the snake insert anchor bolt which concerns on this embodiment. It is a perspective view of the snake insert anchor bolt concerning this embodiment. It is a top view of the snake insert anchor bolt concerning this embodiment. It is a side view of the snake insert anchor bolt concerning this embodiment. It is explanatory drawing of the conventional insert anchor bolt.

The snake insert anchor bolt of the present invention will be described in detail below with reference to the accompanying drawings.
The snake insert anchor bolt 10 of the present embodiment is a bolt applicable to a tipping method that is attached between the reinforcing bars 32 before placing the concrete 34 particularly when the concrete structure 30 is constructed. The concrete structure 30 is a structure in which a plurality of reinforcing bars 32 are embedded in concrete 34.

  FIG. 1 is a construction cross-sectional view of a snake insert anchor bolt according to this embodiment. As shown in the figure, the snake insert anchor bolt 10 is composed of an anchor body 12 bent in a substantially S shape in a side view.

  The anchor main body 12 includes an internal thread portion 20 that can be attached on the same plane as the attachment surface of the concrete structure 30, a first bent portion 22 in which an end portion of the internal thread portion 20 on which the internal thread is not formed is bent, A first shaft 24 extending from the first bent portion 22 in the opposite direction to the female screw portion 20, a second bent portion 26 obtained by bending an end portion of the first shaft 24, and a second bent portion 26 in the opposite direction to the first shaft 24. The second shaft 28 extends. The shaft diameter of the anchor main body 12 is made smaller than the hole diameter of the mounting hole 38 of the mold 36 so that it can be inserted.

  An internal thread portion 20 is formed at the end of the anchor body 12 on the attachment side. The female screw portion 20 has a female screw formed in a recess that can be screwed into the fastening jig 40. The female screw portion 20 has an axial core formed linearly. The recessed end surface of the female screw portion 20 can be mounted on the same plane as the mounting surface of the concrete structure 30. The anchor body 12 is bent in a substantially S shape in a side view so that it can be avoided when it encounters the reinforcing bar 32 of the concrete structure 30 and can be inserted from the mounting hole 38 of the formwork 36.

  FIG. 2 is a perspective view of the snake insert anchor bolt according to the present embodiment. FIG. 3 is a plan view of the snake insert anchor bolt according to the present embodiment. FIG. 4 is a side view of the snake insert anchor bolt according to the present embodiment.

As illustrated, when the first bent portion 22 of the anchor main body 12 is arranged on the Z ₁ axis of the X ₁ Y ₁ Z ₁ axis orthogonal to each other, the X ₁ Y ₁ .theta.1 ° from _{the X 1} axis direction to _{Y 1} axially relative to the _plane, it is bent .theta.2 ° relative to X 1 _{Y 1} plane to -Z ₁ axially. As a result, the first shaft 24 extends from the end of the female screw portion 20 in the direction of the sum of the vector components θ1 + θ2.

The second bent portion 26 is the same as θ1 with respect to the X ₂ Y ₂ plane when the center of the second bent portion 26 is arranged on the Z ₂ axis of the X ₂ Y ₂ Z ₂ axes orthogonal to each other. .theta.3 ° from _{the X 2} axis direction as the direction to the _{Y 2} axis direction, and bent .theta.4 ° to -Z ₂ axial direction with respect to the _X 2 _{Y 2} plane. As a result, the second shaft 28 extends from the end of the first shaft 24 in the direction of the sum of the vector components θ3 + θ4.
At this time, θ1 to θ4 are set to be in a range of 0 ° <| θ1, θ2, θ3, θ4 | <90 °, respectively.

The anchor body 12, when viewed in plan in place to _X 1 _{Y 1} plane _X 1 _Y 1 _{Z 1} axes _{Z 1} on an axis perpendicular to the axis of the first bending portion 22 to each other, the female screw portion 20 to the tip of the second shaft 28 rotates in Z ₁ axis is set to fall within the rotation 1/4 around. Here, the solid anchor body 12 shown in FIG. 3 shows a case where the distal end of the second shaft 28 is formed clockwise from the female screw portion 20 with respect to the X ₁ Y ₁ plane. The dotted anchor body 12 shown in FIG. 3 shows a case where the tip of the second shaft 28 is formed counterclockwise with respect to the X ₁ Y ₁ plane from the female screw portion 20. Snake insert the anchor bolts 10 in this manner, in the present embodiment, when placing the internal thread portion 20 on the Z ₁ axis X ₁ Y ₁ Z ₁ axis, clockwise, be any rotation in the counterclockwise direction Also good. As shown in FIG. 4, the first shaft 24 extends downward (−Z axis side) from the X ₁ Y ₁ plane in a side view, and the second shaft 28 has an X ₂ Y ₂ plane in a side view. Extends downward (−Z-axis side).
Further, the first shaft 24 or the second shaft 28 has an axial core formed in a linear shape or a curved shape.

  The anchor main body 12 of this embodiment is formed using a metal material as an example. The material of the anchor body 12 is not limited to this, and other materials can be applied as long as they have a predetermined rigidity.

  The cross-sectional shape of the snake insert anchor bolt 10 shown in FIG. However, the cross-sectional shape of the snake insert anchor bolt 10 is not limited to this, and any cross-sectional shape that can be inserted from an attachment hole such as an ellipse or a polygon can be applied.

  Moreover, the surface of the snake insert anchor bolt 10 shown in FIG. However, the surface of the snake insert anchor bolt 10 is not limited to this, and smoothness, unevenness, external threads, and the like can also be applied.

  The fastening jig 40 is a jig that is screwed into the female screw portion 20 formed on the end surface of the anchor main body 12 on the attachment side. The fastening jig 40 includes a male screw 44 and a flange 46 which are screwed into the jig main body 42 with the female screw part 20. The jig body 42 is formed so that it can be inserted into the mounting hole 38 of the mold 36. The flange portion 46 is formed along the same plane as the mounting surface of the mold 36.

  Next, the attachment of the snake insert anchor bolt of the present invention having the above configuration will be described below. As a method for attaching the snake insert anchor bolt 10, first, the fastening jig 40 is attached to the female screw portion 20. In this embodiment, it can attach by screwing the external thread 44 of the fastening jig 40 with the internal thread of the internal thread part 20. The snake insert anchor bolt 10 and the fastening jig 40 are detachable. Then, the tip of the anchor body 12, that is, the tip of the second shaft 28 is inserted into the mounting hole 38 of the mold 36. The axis of the second shaft 28 is formed in a linear or curved shape so that it can be inserted into the mounting hole 38. Then, the first shaft 24 is inserted while being rotated by the second bent portion 26. When the first bent portion 22 is further rotated and inserted, it passes through the attachment hole 38 and is deeper than the rebar 32 (from the attachment hole 38 to the rebar 32 while avoiding interference with the rebar 32 existing on the line orthogonal to the attachment surface. It can be inserted so as to wrap around the reinforcing bar 32 (longer than the distance up to).

  According to such a snake insert anchor bolt and its construction method of the present invention, in the tipping method to be attached between the reinforcing bars before placing concrete, particularly during the construction of the concrete structure, it passes through the attachment hole and is orthogonal to the attachment surface. Even if there is a reinforcing bar on the wire to be attached, it can be easily attached.

  The snake insert anchor bolt of the present invention is particularly useful in the technical field of a tipping method that is attached between rebars before placing concrete during construction of a concrete structure in which reinforcing bars are embedded.

DESCRIPTION OF SYMBOLS 1 ......... Insert anchor bolt, 2 ......... Reinforcing bar, 3 ......... Formwork, 4, 4a, 4b ......... Installation hole, 10 ... Snake insert anchor bolt, 12 ......... Anchor body, 20 ... ...... Female thread part, 22 ......... 1st bent part, 24 ... ... 1st shaft, 26 ... ... 2nd bent part, 28 ... ... 2nd shaft, 30 ... ... Concrete structure, 32 ... ... Reinforcing bar, 34 ... Concrete, 36 ... Formwork, 38 ... Mounting hole, 40 ... Fastening jig, 42 ... Jig body, 44 ... Male screw, 46 ... Department.

Claims (4)

A snake insert anchor bolt capable of inserting an anchor body into a mounting hole provided in a formwork of a concrete structure in which a reinforcing bar is embedded, before placing the concrete,
The anchor body is
An internal thread portion that can be mounted on the same plane as the mounting surface of the concrete structure;
A first bent portion obtained by bending an end portion of the female screw portion;
A first shaft extending from the first bent portion;
A second bent portion obtained by bending an end portion of the first shaft;
A second shaft extending from the second bent portion;
Consists of
The female thread portion has a straight shaft core,
A snake insert anchor bolt, wherein the anchor body can be inserted while rotating from the outside of the mounting hole toward the reinforcing bar side. The anchor body is
When the center of the first bent portion is arranged on the Z ₁ axis of X ₁ Y ₁ Z ₁ axis orthogonal to each other, θ1 ° from the X ₁ axis direction to the Y ₁ axis direction with respect to the X ₁ Y ₁ plane, The first shaft is formed by bending θ2 ° in the −Z ₁ axis direction with respect to the X ₁ Y ₁ plane,
When the center of the second bent portion is arranged on the Z ₂ axis of the X ₂ Y ₂ Z ₂ axes orthogonal to each other, the Y ₂ direction from the X ₂ axis direction that is the same direction as the θ 1 with respect to the X ₂ Y ₂ plane .theta.3 ° to ₂ axially bent .theta.4 ° to -Z ₂ axial direction with respect to the _X 2 _{Y 2} plane, to form the second shaft,
The θ1 to θ4 are
0 ° <| θ1, θ2, θ3, θ4 | <90 °
The snake insert anchor bolt according to claim 1, which is set in a range of The anchor body, in a plan view in X ₁ Y ₁ Z ₁ and arranged on Z ₁ axes of X ₁ Y ₁ plane perpendicular to the axis of said first bent portion to each other, around the female threaded portion 3. The snake insert anchor bolt according to claim 1, wherein the snake insert anchor bolt according to claim 1 or 2 is set within ¼ rotation from the Z ₁ axis to the tip of the second shaft.   The snake insert anchor bolt according to any one of claims 1 to 3, wherein the first shaft or the second shaft has a linear or curved axis.

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