JP2015161066A - Fastening structure and installation method of post-installed anchor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method to investigate the tensile strength of a post-installed anchor fastened to a base material without manually pulling out the anchor.SOLUTION: A hole H is drilled down to a designated depth in a base material C, and a mark 3 is put on a core material in such a manner that the distance between the tip of the core material 1 and the base edge of the mark 3 is shorter than the depth of the hole by the amount equivalent to the length of stretch of the core material 1 when force is loaded to the post-installed anchor 10. The core material 1 is inserted into the hole H and fixed to the base material C so that the mark 3, which is to indicate the position, is positioned at a point which is in the vicinity of the mouth Ha of the hole H of the core material 1 fixed to the base material C and closer to the base material C than the mouth Ha is. With this arrangement, in the case where the core material 1 comes out of the base material C, the mark 3, which has been hidden in the base material C, becomes visible.

Description

  The present invention relates to a fixing structure for fixing a post-construction anchor to a base material, and a method for fixing the post-construction anchor to a base material.

After being installed on a base material such as concrete, the construction anchor may come out due to the action of a load. When the post-construction anchor comes out, it means that the fixing length is shortened, which means that the tensile strength of the post-construction anchor is lowered. For this reason, after constructing the post-construction anchor, it is necessary to periodically test the post-construction anchor and check its soundness. In the test, several post-construction anchors are selected and pulled out, and the soundness of other post-construction anchors that were not pulled out is estimated based on the tensile strength that the anchor had. Is called.
In recent years, when such a test is performed, a test apparatus in which the force required for drawing is reduced by the principle of the lever is sometimes used (Patent Document 1).

JP 2009-229163 A

  However, in the conventional test, since the construction anchor is pulled out from the base material after the test object, it cannot be used thereafter. In addition, for other post-construction anchors that were not tested, it was possible to know the approximate soundness but not to know the tensile strength quantitatively.

  The present invention has been made in view of the above problems, and an object thereof is to provide a method for examining the tensile strength of a post-construction anchor fixed to a base material without manually pulling out the post-construction anchor.

  In order to solve the above-described problems, the present invention provides a fixing structure for a post-installed anchor, in which a core material inserted into a hole drilled in a base material and fixed to the base material has an opening in the hole. A mark for informing the position is provided in the vicinity and closer to the base material side than the opening.

"In the vicinity of the opening of the hole and closer to the base material than the opening", the base end of the mark is in a position slightly behind the opening or in the same plane as the opening Is included.
In addition, “marks” are tapes, paints, ring members, core material surfaces such as shaving / scratching processes, etc. Anything can be used as long as it can distinguish the difference in appearance.

  In this way, the mark at the beginning of construction cannot be visually recognized because it is shielded by the base material. However, when the core material comes out of the base material, the mark moves to be outside the base material and becomes visible. . By visually recognizing this mark, it can be understood that the construction anchor has come out later. In addition, there is a correlation between the fixing length of the core material and the residual strength of the post-construction anchor, so it is possible to know how far the post-construction anchor has come off by measuring how far the mark is from the base material. It is possible to quantitatively grasp the current tensile strength of post-installed anchors.

Desirably, in the above invention, the mark is a scale attached along the axial direction of the core member.
By doing so, the numerical value indicated by the scale becomes the length that the construction anchor 10 is pulled out as it is, so that it is possible to accurately grasp the protruding length only by looking at the numerical value of the scale.

Preferably, in the above invention, the mark is painted so that the color changes along the axial direction of the core material.
The difference in color is easy to understand even when viewed from a distance, so that it is possible to easily grasp the escape of the construction anchor after installation in a place where it is difficult to approach and examine.

Preferably, in the above invention, the post-construction anchor is an adhesive type in which a space between the hole and the core material is filled with an adhesive, and the core material is between the opening and a predetermined depth. And the adhesive, or the adhesive and the base material are preferably not attached.
The “not attached” state includes a state in which a gap is left, a state in which a spacer that is easily deformed or peeled is interposed, and the like.
When the conventional adhesive anchor is pulled out, the surface layer of the base material, and the area around the post-installed anchor is pulled by the core material and destroyed or raised, making it difficult to grasp the core material coming out. However, in this way, even in the case of an adhesive anchor, when the post-construction anchor comes out, the base material is not destroyed, that is, the base material and the surface of the adhesive are not displaced, Since the mark moves out of the base material, it can be easily grasped that the construction anchor has come out later.

  Further, the present invention is a post-construction anchor construction method, drilling a hole of a predetermined depth in the base material, the distance from the tip of the core material of the core material than the depth of the hole, Mark the position where the core material becomes shorter when the load is applied to the post-construction anchor, insert the core material into the hole until the tip reaches the back of the hole, It is characterized by being fixed on a base material.

  In this way, the post-construction anchor is fixed to the base material, and when a load is applied to the post-construction anchor, the core material extends, so the mark is located near the opening of the hole and closer to the base material side than the opening. Will do. The mark at the beginning of construction cannot be visually recognized because it is shielded by the base material, but when the core material comes out of the base material, the mark moves out of the base material and becomes visible. By visually recognizing this mark, it becomes possible to grasp that the construction anchor has come out later. In addition, there is a correlation between the withdrawal length of the core material (remaining anchoring length) and the residual strength of the post-construction anchor. By knowing how far the mark is from the base material, how far the post-construction anchor is pulled out As a result, it is possible to quantitatively grasp the current tensile strength of post-installed anchors.

Preferably, in the above invention, an adhesive anchor is used as the post-construction anchor, and after marking the core material, the core material has a predetermined length from the base end of the mark toward the distal end. It is good to provide the spacer which has and to insert the said core material in the said hole, and to fill with the adhesive between the said core material and the inner wall of the said hole, and between the said spacer and the said hole.
In this way, when the core material is inserted into the hole, the spacer is positioned from the opening of the hole to the back by a predetermined width to prevent contact between the core material and the adhesive. Even after the adhesive filled in between is hardened, the core material and the adhesive do not adhere between the opening and the predetermined depth. For this reason, when the core material comes out, the adhesive and the surrounding base material are destroyed and do not peel off or rise, so that the mark can be visually recognized with certainty.

  According to the present invention, the tensile strength of the post-construction anchor fixed to the base material can be examined without manually pulling out the post-construction anchor.

It is the figure which showed the fixing structure of the post-construction anchor of 1st Embodiment. It is the figure which showed the modification of the fixing structure of the post-construction anchor of the embodiment. It is the figure which showed the modification of the fixing structure of the post-construction anchor of the embodiment. It is the figure which showed the modification of the fixing structure of the post-construction anchor of the embodiment. It is the figure which showed the fixing structure of the post-construction anchor of 2nd Embodiment. It is the figure which showed the modification of the fixing structure of the post-construction anchor of the embodiment.

<First Embodiment>
Hereinafter, with reference to FIGS. 1-4, 1st Embodiment of this invention is described in detail.

(Fixing structure)
The anchor structure of the post-construction anchor according to the present embodiment uses a metal anchor. That is, the post-construction anchor 10 includes a core material 1 inserted into a hole H drilled in the base material C, and a fixing portion 2 provided at the tip of the core material 1 as shown in FIG. The fixing portion 2 is fixed by biting into a base material C made of concrete or the like. A mark 3 is attached to a position slightly deeper than the opening Ha of the hole H on the surface of the core material 1. As the mark 3, a tape, a paint, an annular member, or the like that does not deteriorate while the post-construction anchor 10 is fixed to the base material C and can be easily distinguished from the surface of the core material 1 is used. From the opening Ha, the diameter of the hole H is slightly larger than the diameter of the core material 1 and the gap between the hole H and the core material 1 is very narrow. The marks 3 provided at the locations are hardly visible from the outside.

  Thereafter, if a load continues to act on the construction anchor 10 in the direction of pulling to the base end side, the core material 1 may come out of the base material C in some cases. In such a case, as shown in FIG. 1 (b), the mark 3 shielded by the base material C moves to the base end side of the core material 1 and comes out of the base material C to be visually recognized from the outside. It becomes possible. By visually recognizing this mark 3, it can be understood that the post-construction anchor has come out from the beginning of construction. In addition, since there is a correlation between the length of the post-construction anchor that has been pulled out (remaining anchoring length) and the residual tensile strength of the post-construction anchor, the length of the core material 1 that has slipped out, so The tensile strength can also be examined quantitatively.

(Construction method)
In order to construct the post-construction anchor as described above, first, a hole H having a predetermined depth is drilled in the portion of the base material C where the post-construction anchor is to be installed. Then, a mark 3 is attached to the core material 1. The mark 3 is such that the distance between the tip of the core material 1 and the base end of the mark 3 is shorter than the depth of the hole H by the length of extension of the core material 1 when a load is applied to the post-construction anchor. Attach to position. When the mark 3 is attached, the core material 1 is inserted into the hole H. When the core material 1 is inserted into the hole H, the mark 3 is shielded by the base material C. In this state, the fixing unit 2 is fixed to the base material C. After fixing, when a load is applied to the post-construction anchor 10, the core material 1 is extended, and the mark 3 is moved to the base end side by that amount, and finally located near the opening Ha. By doing so, the post-construction anchor is installed in a form that can easily grasp the residual tensile strength.

[Modification 1]
As shown in FIG. 2, the mark is a scale 3 a that is carved in the direction of the distal end of the core material 1 with the position of the intersection line between the surface of the core material 1 and the surface of the base material C as the starting point (0). Also good. By doing so, the scale cannot be visually recognized at the beginning of the installation of the post-construction anchor, but the scale can be visually recognized when the core material 1 comes out. Since the numerical value indicated by the scale is the length that the construction anchor 10 has been pulled out as it is, it is possible to accurately grasp the length by simply looking at the numerical value on the scale.

[Modification 2]
Moreover, as shown in FIG. 3, the mark is 1 mm each time it makes a round along the opening Ha from an arbitrary point on the intersection line with the surface of the base material C on the surface of the core 1 as the starting point (0). On the spiral line drawn so as to be shifted toward the front end side, the scale may be engraved at intervals equal to one round. In this way, the numerical value indicated by the intersection point of the spiral line and the surface of the base material C is the length of withdrawal. Judgment of the removal length of the post-installed anchor may be made on the order of 0.1 mm in some cases, but the scale is engraved at intervals of 0.1 mm, and compared to the linear scale as in Modification 1. Since the interval is extended, it is possible to measure a more precise withdrawal length. Of course, if only the numbers (0.0, 1.0, 2.0, 3.0,...) Arranged in a line in the axial direction are seen, it can be used as a scale similar to the scale 3a of the first modification, so 1 mm You can also check the approximate exit length of the order.

[Modification 3]
Moreover, as shown in FIG. 4, you may color the surface of the core material 1 so that it may change in steps toward the front-end | tip from a base end. For example, the base end is a cold color (for example, blue or green, light color in the figure), and gradually changes to a warm color (yellow or red, dark color in the figure) toward the tip. It is good also as a color scheme. In this way, when the post-construction anchor is initially installed, a cold color is visually recognized, and when the core material 1 comes out, a warm color is visually recognized. That is, in this case, a warm color (a dark color in the figure) corresponds to the mark 3. The difference in color is easy to understand even when viewed from a distance, so that it is possible to easily grasp the escape of the construction anchor after installation in a place where it is difficult to approach and examine.

  As described above, the anchor structure of the post-installed anchor according to the present embodiment is that of the opening Ha of the hole H of the core material 1 inserted into the hole H drilled in the base material C and fixed to the base material C. It is assumed that a mark 3 for informing the position is provided in the vicinity and closer to the base material C side than the opening Ha.

  In this way, the initial mark 3 is shielded by the base material C and cannot be visually recognized. However, when the core material 1 comes out of the base material C, the mark 3 moves and goes out of the base material C. And become visible. By visually recognizing this mark 3, it can be understood that the construction anchor 10 has been pulled out. Further, since there is a correlation between the fixing length of the core material 1 and the residual tensile strength of the post-construction anchor 10, knowing how far the mark 3 is away from the base material C, how much the post-construction anchor 10 has come out. Therefore, it is possible to quantitatively grasp the current tensile strength of the post-construction anchor 10.

Moreover, the fixing structure of the post-construction anchor of the present embodiment includes the case where the mark is a scale 3 a attached along the axial direction of the core material 1.
In this way, the numerical value indicated by the scale 3a is the length that the construction anchor 10 is pulled out as it is, so that it is possible to accurately grasp the protruding length simply by looking at the numerical value of the scale.

Further, the fixing structure of the post-construction anchor of the present embodiment includes the case where the mark 3 is painted such that the color changes along the axial direction of the core material 1.
Since the difference in color is easy to understand even when viewed from a distance, it is possible to easily grasp the escape of the construction anchor 10 after being installed in a place where it is difficult to approach and examine.

  Further, in the post-installation anchor construction method of this embodiment, a hole H having a predetermined depth is drilled in the base material C, and the distance from the tip of the core material 1 to the core material 1 is greater than the depth of the hole H. Then, when a load is applied to the construction anchor 10, a mark 3 is attached at a position where the core material 1 is shortened by the extension, and the core material 1 is inserted into the hole H until the tip reaches the back of the hole H. The base material C was fixed.

  By doing so, the post-construction anchor 10 is fixed to the base material C, and when a load is applied to the post-construction anchor 10, the core material 1 extends, so that the mark 3 is near the opening Ha of the hole H, and the opening Ha Rather than the base material C side. The initial mark 3 is shielded by the base material C and cannot be visually recognized. However, when the core material 1 comes out of the base material C, the mark 3 moves and comes out of the base material C and becomes visible. . By visually recognizing the mark 3, it is possible to grasp that the construction anchor 10 has come out later. In addition, since there is a correlation between the fixing length of the core material 1 and the remaining proof stress of the post-construction anchor 10, how far the post-construction anchor 10 slips out by knowing how far the mark 3 is from the base material C. Therefore, the current tensile strength of the post-installed anchor 10 can be quantitatively grasped.

Second Embodiment
Next, a second embodiment of the present invention will be described with reference to FIGS.
Here, only differences from the first embodiment will be described, and description of common points will be omitted.

(Fixing structure)
In the first embodiment, the fixing structure using the metal anchor has been described. However, the fixing structure of the post-construction anchor according to the present embodiment uses an adhesive anchor. That is, the post-construction anchor 10A of this embodiment is fixed to the base material C by the adhesive 4 filled between the base material C and the core material 1A. The mark 3 is attached to the surface of the core material 1A in the same manner as in the first embodiment, and cannot be easily visually recognized from the outside at the beginning of construction.

  Further, a spacer 5 is interposed between the core material 1A and the adhesive 4 between the opening Ha and a predetermined depth. Since the spacer 5 is formed of a material that easily deforms or peels off, such as grease or tape, the adhesion between the core material 1A and the adhesive 4 is cut between the opening Ha and a predetermined depth. It is the same state as. The predetermined depth is a range of destruction of the surface layer portion of the base material C, which is assumed to occur when the core material 1A is pulled out when the construction anchor 10A is fixed to the base material C without the spacer 5 interposed ( For example, the height is the same as the height of the cone when peeled into a cone.

  Thereafter, if a load continues to act on the construction anchor in the direction of pulling to the base end side, the core material 1A may gradually come out of the adhesive 4 in some cases. In such a case, conventionally, the surface layer portion of the base material C was pulled and broken by the core material 1A, and was peeled off in a conical shape or swelled. Since the adhesion between the material 1A and the surface layer portion of the base material C is broken, the surface layer portion of the base material C is not destroyed (the surface is not displaced) and the hole H is opened as shown in FIG. The mark 3 shielded by the base material C in the vicinity of Ha moves out of the base material C and becomes visible from the outside. By visually recognizing the mark 3, it can be understood that the construction anchor 10 has come out. In some cases, the spacer 5 may come out together with the core material 1. In this case, the spacer 5 functions as the mark 3.

(Construction method)
In order to construct the post-construction anchor 10A as described above, first, the hole H is drilled in the base material C as in the first embodiment. And the mark 3 is attached to 1 A of core materials similarly to 1st Embodiment. Thereafter, the spacer 5 is provided by winding a tape or applying grease around the core material 1A. The range in which the spacer 5 is provided is provided from the vicinity of the base end of the mark 3 to the distal end up to a position separated by the above-described range of destruction of the base material C when the spacer 5 is not provided. Then, the core material 1A is inserted into the hole H drilled in the base material C. When the core material 1A is inserted to the back of the hole H, the mark 3 is shielded by the base material C, and the spacer 5 is positioned between the opening Ha and a predetermined depth. In this state, the adhesive 4 is filled between the hole H and the core material 1 to fix the core material 1 to the base material C. After fixing, when a load is applied to the post-construction anchor 10A, the core material 1A is stretched, and the mark 3 and the spacer 5 are moved to the proximal end side, and finally located near the opening Ha. By doing so, the post-construction anchor is installed in a form that allows easy grasp of the slipping out.

[Modification]
In addition, the spacer 5 is not provided between the core material 1A and the adhesive, and the spacer 5A is interposed between the base material C and the adhesive 4 as shown in FIGS. 6A and 6B. When the post-construction anchor 10A is constructed, the adhesive 4 may be filled with the spacer 5A provided on the inner surface of the machined hole H. In this way, when the post-construction anchor 10A comes out, as shown in FIG. 6 (a), the surface layer portion of the adhesive 4 is separated from the intermediate portion, and the core material 1A and the surface layer portion of the adhesive are integrated. Get out of the base material C. Or as shown in FIG.6 (b), all the adhesive agents 4 slip out of the base material C with the core material 1A. In this case, the side surface of the adhesive 4 corresponds to the mark 3.

As described above, in the post-construction anchor fixing structure of the present embodiment, the post-construction anchor 10 is an adhesive type in which the space between the hole H and the core material 1 is filled with the adhesive 4, and from the opening Ha. Until the predetermined depth, the core material 1 and the adhesive 4 or the adhesive 4 and the base material C are not attached.
When the conventional adhesive anchor is pulled out, the surface layer portion of the base material C and the portion around the post-installed anchor 10 is pulled by the core material 1 and is broken or raised, so that the core material 1 is pulled out. Although it was difficult to grasp, in this way, even in the case of an adhesive anchor, when the construction anchor 10 is pulled out, the base material C is not destroyed, that is, the base material C and the adhesive 4 Since the mark 3 moves out of the base material C without displacing the surface, it can be easily grasped that the post-construction anchor 10 has come out.

Further, in the post-construction anchor construction method of the present embodiment, an adhesive anchor is used as the post-construction anchor 10, the mark 3 is attached to the core material 1, and then the core material 1 is moved from the proximal end of the mark 3 to the distal direction. A spacer 5 having a predetermined length is provided, the core material 1 is inserted into the hole H, and an adhesive 4 is provided between the core material 1 and the inner wall of the hole H and between the spacer 5 and the inner wall of the hole H. It was made to fill with.
By doing so, when the core material 1 is inserted into the hole H, the spacer 5 is positioned from the opening Ha of the hole H to the back by a predetermined length to prevent contact between the core material 1 and the adhesive 4. Therefore, even after the adhesive 4 filled between the hole H and the core material 1 is cured, the core material 1 and the adhesive 4 do not adhere between the opening Ha and a predetermined depth. For this reason, when the core material 1 is pulled out, the adhesive 4 and the surrounding base material C are destroyed and do not peel off or rise, so that the mark 3 can be visually recognized with certainty.

As mentioned above, although this invention was concretely demonstrated based on embodiment, this invention is not limited to the said embodiment, It can change in the range which does not deviate from the summary.
For example, in this embodiment, by providing the mark 3 in the vicinity of the opening Ha, it is possible to visually recognize how far the position has been removed from the initial position of construction. However, the post-construction anchor needs to be repaired and replaced immediately from the opening Ha. It may be provided at an arbitrary position as long as it does not exceed the escape length.
Moreover, in the modification 2 of 1st Embodiment, although the core material 1 whole was coated, you may make it paint only the front end side from the vicinity of opening Ha.
In the second embodiment, the core 5 and the adhesive or the base material and the adhesive are cut off by interposing the spacer 5 at the time of construction, but after the construction as usual, the adhesive is cut. You may make it adhere by.

10, 10A Post-installed anchor 1, 1A Core material 3, 3a Mark 4 Adhesive 5, 5A Spacer C Base material H Hole Ha Opening

Claims (6)

It is a fixing structure for post-construction anchors,
There is a mark for informing the position of the core material inserted into the hole drilled in the base material and fixed to the base material in the vicinity of the opening of the hole and closer to the base material side than the opening. A post-installation anchor fixing structure characterized by being provided.   The post-construction anchor fixing structure according to claim 1, wherein the mark is a scale provided along an axial direction of the core member.   The post-construction anchor fixing structure according to claim 1, wherein the mark is painted such that the color changes along the axial direction of the core member. The post-installed anchor is an adhesive type in which the space between the hole and the core material is filled with an adhesive,
The core material and the adhesive, or the adhesive and the base material are not adhered between the opening and a predetermined depth. Fixing structure for post-installed anchors as described in the section. After construction anchor construction method,
Drill a hole of a predetermined depth in the base material,
Marking the position of the core material, the distance from the tip of the core material is shorter than the depth of the hole by the amount that the core material extends when a load is applied to the post-construction anchor,
A post-installation anchor construction method, wherein the core material is inserted into the hole until the tip of the core reaches the back of the hole and fixed to the base material. Using an adhesive anchor as the post-construction anchor,
After marking the core material, the core material is provided with a spacer having a predetermined length in the distal direction from the base end of the mark,
6. The method according to claim 5, wherein the core material is inserted into the hole, and the space between the core material and the inner wall of the hole and between the spacer and the hole is filled with an adhesive. Construction method of construction anchor.

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