JP2021042598A - Anchor installation structure - Google Patents

Abstract

To provide an anchor installation structure which can obtain a fixing force with essential and sufficient installation strength in normal usage, and can prevent breakage of a fragile base material where an anchor is installed and in which a repair/recovery work at breakage can be carried out with less labor even when an impact force is applied.SOLUTION: An anchor installation structure installs, in a fragile base material 100, an anchor 1 constituted of: an exterior body 2 formed with a female screw portion 21 at its inner periphery; and a breakage inducing bolt 3 formed with a male screw portion 33 screwed with the female screw portion 21 of the exterior body 2 on its outer periphery. The exterior body 2 is stored in a bottomed hole 110 formed in the fragile base material 100. The male screw portion 33 of the breakage inducing bolt 3 is screwed with the female screw portion 21 of the exterior body 2, to fix the breakage inducing bolt 3 to the fragile base material 100. At a predetermined position in a bolt axis direction in a protruding part of the breakage inducing bolt 3 which protrudes from a surface of the fragile base material 100, there is provided a breakage inducing portion 34 with strength at least lower than that of the male screw portion 33 screwed with the exterior body 2.SELECTED DRAWING: Figure 5

Description

The present invention relates to an anchor installation structure in which an anchor is installed on a fragile base material having a strength lower than that of ordinary concrete such as asphalt, brick, ALC, lightweight aerated concrete (ALC), and low-strength concrete.

Conventionally, when attaching an attachment to a fragile base material such as asphalt, an anchor is installed on the fragile base material, and the attachment is attached via the anchor. When an anchor is installed on a fragile base material, for example, as shown in FIG. 11A, a sleeve 210 having a female screw 211 formed on the inner circumference and a male screw 221 screwed with the female screw 211 are formed on the outer circumference. Using the anchor 200 composed of the threaded rod 220, the sleeve 210 of the anchor 200 is accommodated in the bottomed hole 231 having a depth substantially corresponding to the length of the sleeve 210 formed in the fragile base material 230, and the sleeve 210 of the anchor 200 is sufficiently fixed. The sleeve 210 is fixed to the fragile base material 230 around the bottomed hole 231 with the adhesive material 240 and installed.

Further, as in Patent Document 1, a through hole is formed so as to penetrate the asphalt of the fragile base material, and a bottomed hole having a diameter larger than that of the asphalt through hole is formed in the soil portion under the asphalt to form a blade type. There is also a structure in which an anchor is inserted to open the expansion piece of the inserted blade-shaped anchor, and mortar is injected into the gap between the bottomed hole and the rest of the through hole to install the anchor.

Japanese Unexamined Patent Publication No. 2006-228165

However, when installing an attachment or anchor on a fragile base material, it is not sufficient to simply install the anchor with a strong fixing force, depending on the environment in which it is installed and the function of the attachment. For example, when installing an anchor on the asphalt pavement of a road, if the anchor is installed with a strong fixing force so that the vehicle will not lose even if it collides with the equipment, the vehicle will collide. At that time, a tensile load P in the bolt axis direction and a shear load T in the direction perpendicular to the bolt axis direction are applied, and a large region of the fragile base material is destroyed together with the base material (FIGS. 11 (b), (Fig. 11 (b)). c) See). When such destruction of the base material occurs, it is necessary to repair not only the anchor and the standing object but also the deep position of the fragile base material, which requires a great deal of labor for repair and restoration. Therefore, there is a need for a structure that has a fixing force with a necessary and sufficient installation strength during normal use and can prevent the base metal from being destroyed in the unlikely event that an impact force is applied.

The present invention has been proposed in view of the above problems, and it is possible to obtain a fixing force having a necessary and sufficient installation strength during normal use, and a fragile mother in which an anchor is installed in the unlikely event that an impact force is applied. It is an object of the present invention to provide an anchor installation structure that can prevent the material from being destroyed and can perform repair / restoration work at the time of breakage with a small amount of labor.

The anchor installation structure of the present invention is fragile of an anchor composed of an exterior body having a female threaded portion formed on the inner circumference and a fracture-inducing bolt having a male threaded portion screwed to the female threaded portion of the exterior body formed on the outer circumference. In the installation structure to be installed on the base material, the exterior body is placed in a bottomed hole formed in the fragile base material or a bottomed hole formed from the fragile base material to a deep layer at a position deeper than the fragile base material. The rupture-inducing bolt is housed and the male-threaded portion of the rupture-inducing bolt is screwed into the female-threaded portion of the exterior body to fix the rupture-inducing bolt to the fragile base material and to protrude from the surface of the fragile base material. It is characterized in that a fracture inducing portion having a strength lower than that of the male screw portion that is screwed into the exterior body is provided at a predetermined position in the protruding portion of the bolt in the bolt axis direction.
According to this, by screwing the male threaded portion into the female threaded portion of the exterior body housed in the bottomed hole to fix the fracture-inducing bolt, it is possible to obtain a fixing force having a necessary and sufficient installation strength during normal use. .. In addition, the rupture-inducing portion at a predetermined position in the bolt axial direction at the protruding portion of the rupture-inducing bolt breaks the anchor at the rupture-inducing portion in the unlikely event that an impact force is applied, and the fragile base metal on which the anchor is installed is destroyed. Can be prevented. Therefore, repair / restoration work at the time of damage can be performed with little effort.

The anchor installation structure of the present invention is characterized in that the fracture inducing portion is formed in a notch shape so that the cross-sectional area of the shaft portion of the fracture inducing bolt is reduced.
According to this, the fracture inducing bolt can be cut out to easily form the fracture inducing portion. Further, the cross-sectional area of the fracture-inducing bolt can be easily adjusted by the amount of the notch, and the load at which the fracture-inducing bolt breaks can be easily set by adjusting the notch amount. In addition, by forming the cross-sectional area of the rupture-inducing part of the rupture-inducing bolt small, in addition to preventing the fragile base material from breaking, it also prevents the male screw part of the rupture-inducing bolt screwed inside the exterior body from being damaged. can do.

The anchor installation structure of the present invention is characterized in that the fracture-inducing portion is formed in a substantially polygonal prism shape.
According to this, when the fracture-inducing portion is broken, the fracture-inducing portion having a substantially polygonal prism shape such as a substantially square prism shape or a substantially hexagonal prism shape is exposed and remains, and a tool such as a wrench can be used. The exposed substantially polygonal fracture-inducing portion can be gripped and the fracture-inducing bolt that has been fractured can be easily rotated and removed.

The anchor installation structure of the present invention is characterized in that a male screw portion of the fracture inducing bolt is provided between the surface of the fragile base material and the fracture inducing portion.
According to this, when the fracture-inducing portion breaks, the male screw portion remains in a state of protruding from the surface of the fragile base material. Therefore, regardless of the degree of damage of the fracture-inducing portion, the male screw protruding from a tool such as a full-thread wrench. The rupture-inducing bolt that has been easily broken by being fitted into the portion can be rotated and removed.

The anchor installation structure of the present invention is characterized in that the voids of the bottomed holes are filled with a fixing material, and the anchor is fixed by the cured fixing material.
According to this, by fixing the anchor with the fixing material, it is possible to more reliably obtain the necessary and sufficient fixing force of the installation strength.

Further, in the method for regenerating the anchor installation structure of the present invention, when the fracture-inducing bolt is broken at the fracture-inducing portion in the anchor installation structure of the present invention, the remaining portion of the fracture-inducing bolt that is broken at the fracture-inducing portion is removed. It is characterized in that it is removed from the exterior body, the remaining portion is removed, and another fracture-inducing bolt is attached to the remaining exterior body.
According to this, when the rupture-inducing bolt breaks at the rupture-inducing part and is removed from the exterior body, the rupture-inducing bolt that remains undamaged is reused, which is different from the rupture-inducing bolt that broke in the rupture-inducing part. A new anchor can be constructed by attaching another new break-inducing bolt, which enables effective use of component resources and reduction of component cost. In addition, since anchors can be installed using the exterior body housed in the existing bottomed holes, repair and restoration work such as anchor installation work and new attachment installation work can be performed efficiently and speedily. it can.

Further, the installation structure of the shock absorbing attachment of the present invention is an installation structure of the shock absorbing attachment installed via the anchor of the anchor installation structure of the present invention, and the shock absorbing attachment is It is provided so as to absorb the impact by deformation and to cause the deformation of the shock absorbing type attachment with a force smaller than the force for breaking the fracture-inducing portion of the fracture-inducing bolt. It is a feature.
According to this, the shock absorbing type attachment can be attached in a state where the necessary deformation is ensured without hindering the deformation when an impact is applied to the shock absorbing type attachment by fixing it too strongly. In addition, by providing the shock-absorbing attachment so that the deformation of the shock-absorbing attachment occurs with a force smaller than the force that breaks the fracture-inducing part, the shock-absorbing type attachment such as a shock-absorbing protective fence can be attached while ensuring the necessary deformation. You can attach things. Further, when a large impact that cannot be absorbed by this deformation is applied to the shock absorbing attachment, the rupture-inducing portion of the rupture-inducing bolt breaks, so that the breakage of the fragile base material can be effectively suppressed. ..

According to the anchor installation structure of the present invention, it is possible to obtain a fixing force having a necessary and sufficient installation strength during normal use, and at the same time, when an impact force is applied, the fragile base material on which the anchor is installed is destroyed. It can be prevented, and repair / restoration work at the time of damage can be performed with little effort.

The perspective view which shows the state which the attachment is attached by the anchor installation structure of 1st Embodiment by this invention. A partial cross-sectional explanatory view showing an anchor installation structure of the first embodiment. (A) is a front view of the exterior body of the anchor in the anchor installation structure of the first embodiment, and (b) is a vertical sectional view thereof. (A) is a plan view of the anchor breakage-inducing bolt in the anchor installation structure of the first embodiment, (b) is a front view thereof, and (c) is a cross-sectional view taken along the line AA. (A) to (c) are partial cross-sectional explanatory views for explaining the fracture and removal of the fracture-inducing bolt in the anchor installation structure of the first embodiment. A partial cross-sectional explanatory view showing the anchor installation structure of the second embodiment. (A) is a front view of the rupture-inducing bolt of the anchor in the anchor installation structure of the second embodiment, (b) is a front view of a nut screwed into the rupture-inducing bolt, and (c) is externally attached to the rupture-inducing bolt. The front view of the washer, (d) is a vertical sectional view of the exterior body of the anchor of the figure (a). (A) and (b) are partial cross-sectional explanatory views for explaining the fracture and removal of the fracture-inducing bolt in the anchor installation structure of the second embodiment. A partial cross-sectional explanatory view showing the anchor installation structure of the third embodiment. A partial cross-sectional explanatory view showing an anchor installation structure of a fourth embodiment. (A) is a partial cross-sectional explanatory view of the anchor installation structure of the conventional example, and (b) and (c) are explanatory views for explaining the failure of the base material of the anchor installation structure of the conventional example.

[Anchor installation structure of the first embodiment]
In the anchor installation structure of the first embodiment according to the present invention, the anchor 1 is installed on a fragile base material 100 having a strength lower than that of ordinary concrete such as asphalt, brick, ALC, lightweight aerated concrete (ALC), and low-strength concrete. It is an anchor installation structure, and as shown in FIGS. 1 and 2, for example, the anchor 1 is installed on a fragile base material 100 such as asphalt pavement. The installed anchor 1 is used for attaching the attachment 120, and a shock absorbing attachment such as a wire rope type guard fence that absorbs impact due to deformation is attached via the anchor 1.

As shown in FIGS. 2 to 4, the anchor 1 in the anchor installation structure of the first embodiment is composed of an exterior body 2 and a fracture-inducing bolt 3. The exterior body 2 is formed in a bottomed cylindrical shape such as a bottomed cylinder, and has a shape in which the uncured fixing material 5 described later does not penetrate into the inside from the lower side, and a female screw portion 21 is formed on the inner circumference thereof. Has been done. The fracture-inducing bolt 3 has the shape of a headed bolt composed of a head portion 31 and a shaft portion 32, and has a hexagonal bolt shape in the illustrated example. A male threaded portion 33 is formed on the outer periphery of the lower portion of the shaft portion 32 of the fracture inducing bolt 3, and the male threaded portion 33 is screwed into the female threaded portion 21 of the exterior body 2.

The fracture-inducing bolt 3 is formed with a fracture-inducing portion 34 above the shaft portion 32 located below the neck of the head 31. The fracture inducing portion 34 is provided at a predetermined position in the bolt axial direction and is formed with a strength lower than that of the male screw portion 33 screwed to at least the exterior body 2 in the bolt axial direction. In the first embodiment, the fracture inducing bolt 3 is formed. The fracture inducing portion 34 is formed by notching so that the cross-sectional area of the shaft portion 32 of the shaft portion 32 is smaller than that of the male screw portion 33. Further, the fracture inducing portion 34 in the first embodiment is formed in a substantially polygonal prism shape having a substantially polygonal cross-sectional shape, and in the illustrated example, the cross-sectional shape is formed in a substantially quadrangular prism shape having a substantially quadrangular cross-sectional shape. ..

It is desirable that the fracture inducing portion 34 is formed in a tapered shape so that the cross-sectional area on the side closer to the shaft portion 32 is larger than the cross-sectional area on the side located below the neck of the head 31. Alternatively, there may be a slight notch near the neck of the head 31 in the fracture inducing portion 34. According to this, when an impact force is applied to the attachment 120, the fracture-inducing portion 34 surely breaks in the upper part such as the vicinity of the head 31 without breaking in the lower part, so that the remaining fracture-inducing portion 34 The tool can be fitted in and easily removed.

In the anchor installation structure of the first embodiment, as shown in FIG. 2, the exterior body 2 of the anchor 1 is opened to the bottomed hole 110 formed in the fragile base material 100 on the surface side of the fragile base material 100. Be housed. Then, the attachment 120 is placed on the surface of the fragile base material 100, the washer 4 is placed on the attachment 120 at a predetermined position, and the breakage induction bolt 3 is inserted into the through hole 121 of the attachment 120 and the through hole 41 of the washer 4. Then, the male threaded portion 33 of the inserted fracture inducing bolt 3 is screwed into the female threaded portion 21 of the exterior body 2 housed in the bottomed hole 110, and the fracture inducing bolt 3 is fixed to the fragile base material 100 and attached. The object 120 is attached so as to be supported by the anchor 1 and fixed to the fragile base material 100.

Further, in this anchor installation structure, the fixing material 5 is filled in the gap of the bottomed hole 110, and the anchor 1 or the exterior body 2 is fixed to the fragile base material 100 by the cured fixing material 5. In the illustrated example, the resin of the fixing material 5 is put in the bottomed hole 110 in advance, the exterior body 2 is embedded in the bottomed hole 110 into which the resin is injected, and then the resin is cured to fix the cured resin. The anchor 1 or the exterior body 2 is fixed to the fragile base material 100 with the material 5.

In the fracture-inducing bolt 3 screwed to the exterior body 2 housed in the bottomed hole 110, the fracture-inducing bolt 3 protruding from the surface of the fragile base material 100 has a fracture at a predetermined position in the bolt axial direction. The trigger portion 34 is arranged. In the illustrated example, the fracture inducing portion 34 is arranged so as to fit inside the through hole 121 of the attachment 120 attached via the anchor 1 and the through hole 41 of the washer 4.

When an impact force is applied to the attachment 120 attached by the anchor installation structure of the first embodiment and a tensile load P is applied to the anchor 1 (see FIG. 5A), the fragile base material 100 is destroyed or the exterior body is formed. Stress is concentrated on the fracture-inducing portion 34 of the anchor 1 having a small cross-sectional area and low strength without causing damage in 2, and the fracture-inducing portion 34 breaks as shown by the white arrow in FIG. 5 (b). Further, even when a shear load T is applied to the anchor 1, the fracture inducing portion 34 of the anchor 1 is similarly fractured without breaking the fragile base material 100 or damaging the exterior body 2. Then, the remaining portion of the fracture-inducing bolt 3 remaining in the fragile base material 100 is removed from the fragile base material 100 by grasping the fracture-inducing portion 34 having a substantially square pillar shape or the like with a tool and removing it from the exterior body 2. See FIG. 5 (c)).

The exterior body 2 from which the fracture-inducing bolt 3 that has been fractured has been removed is maintained in a state of being fixed to the fragile base material 100 by the cured fixing material 5. Therefore, another fracture-inducing bolt 3 having the same shape and size as the fracture-inducing bolt 3 that has been broken but not broken can be screwed to the exterior body 2 and reused, and the fixed exterior body 2 can be reused. A new anchor 1 is constructed by screwing the male threaded portion 33 of another fracture inducing bolt 3 different from the fracture inducing bolt 3 which is different from the fracture inducing bolt 3 into the female threaded portion 21 of the above, and constructing a new anchor 1 to form an anchor installation structure. It is possible to reproduce.

According to the anchor installation structure of the first embodiment, the male threaded portion 33 is screwed into the female threaded portion 21 of the exterior body 2 housed in the bottomed hole 110 to fix the fracture inducing bolt 3, which is necessary for normal use. It is possible to obtain a fixing force with sufficient installation strength. Further, by filling the voids of the bottomed holes 110 with the fixing material 5 and fixing the anchor 1 with the cured fixing material 5, it is possible to more reliably obtain the fixing force having the necessary and sufficient installation strength. Further, the fracture inducing portion 34 at a predetermined position in the bolt axial direction at the protruding portion of the fracture inducing bolt 3 causes the fracture inducing portion 34 to break the anchor 1 in the unlikely event that an impact force is applied, and the anchor 1 is installed. It is possible to prevent the fragile base material 100 from being destroyed. Therefore, repair / restoration work at the time of damage can be performed with little effort.

Further, by forming the fracture inducing portion 34 in a notch shape so that the cross-sectional area of the shaft portion 32 of the fracture inducing bolt 3 becomes small, the fracture inducing portion 34 having low strength can be easily formed. Further, the cross-sectional area of the fracture-inducing bolt 3 can be easily adjusted by the amount of the notch, and the load at which the fracture-inducing bolt 3 breaks can be easily set by adjusting the notch amount. Further, by forming the cross-sectional area of the fracture-inducing portion 34 of the fracture-inducing bolt 3 small, in addition to preventing the fracture of the fragile base material 100, the male screw portion 33 of the fracture-inducing bolt 3 screwed inside the exterior body 2 is formed. Can also be prevented from being damaged.

Further, by forming the fracture-inducing portion 34 in a substantially polygonal prism shape, when the fracture-inducing portion 34 is broken, the fracture-inducing portion 34 having a substantially polygonal prism shape such as a substantially square prism shape or a substantially hexagonal prism shape is broken. Is exposed and remains, and the substantially polygonal fracture-inducing portion 34 exposed by a tool such as a wrench can be gripped, and the fracture-inducing bolt 3 that has been easily fractured can be rotated and removed.

Further, in the anchor installation structure of the first embodiment, when the rupture-inducing bolt 3 is ruptured by the rupture-inducing portion 34 and removed from the exterior body 2, the undamaged exterior body 2 is reused and ruptured. A new anchor 1 can be constructed by attaching another new break-inducing bolt 3 different from the break-inducing bolt 3 broken in the trigger portion 34, and effective use of component resources and reduction of component cost can be achieved. .. Further, since the anchor 1 can be installed by using the exterior body 2 housed in the existing bottomed hole 110, the repair / restoration work such as the installation work of the anchor 1 and the installation work of the new attachment 120 can be efficiently performed. It can be done speedily.

Further, in the structure in which the shock absorbing attachment that absorbs the impact due to deformation is attached via the anchor 1 in the anchor installation structure of the first embodiment, the deformation when the impact is applied to the shock absorbing attachment is too strong to be fixed. The shock-absorbing attachment can be attached in a state where the necessary deformation is ensured without being hindered by. For example, shock-absorbing protective fences such as wire rope-type protective fences installed in the central separation zone of roads receive the vehicle by the tension of the wire rope when the vehicle collides, and also cushion the impact by deforming or collapsing the columns. Therefore, if the fixing force of the strut is too strong, the impact cannot be mitigated, but the impact is absorbed while ensuring the occurrence of the necessary deformation by mounting via the anchor 1 having the fracture inducing portion 34. A type guard fence can be attached.

Further, in the installation structure of the shock absorbing attachment which is provided so as to absorb the impact by deformation by attaching the shock absorbing attachment via the anchor 1 in the anchor installation structure of the first embodiment, the fracture inducing bolt 3 is used. It is preferable to provide the fracture-inducing portion 34 with a force smaller than the force for breaking the fracture-inducing portion 34 so that the impact-absorbing attachment for absorbing the impact is deformed. For example, shock-absorbing protective fences such as wire rope-type protective fences installed in the central separation zone of roads receive the vehicle by the tension of the wire rope when the vehicle collides, and also cushion the impact by deforming or collapsing the columns. However, if the rupture-inducing portion 34 is ruptured with a force smaller than the deformation of the wire, the strut, or the like, the function of absorbing and mitigating the impact provided by the impact-absorbing attachment is not sufficiently exhibited. Therefore, by providing the impact absorbing type attachment so that the deformation of the shock absorbing attachment occurs with a force smaller than the force for breaking the fracture inducing portion 34, the shock absorbing type such as a shock absorbing type protective fence is provided in a state where the necessary deformation is ensured. Attachments can be attached. Further, when a large impact that cannot be absorbed by this deformation is applied to the shock absorbing attachment, the fracture inducing portion 34 of the fracture inducing bolt 3 breaks, which effectively breaks the fragile base material 100. Can be suppressed.

[Anchor installation structure of the second embodiment]
In the anchor installation structure of the second embodiment according to the present invention, the anchor 1a is installed on a fragile base material 100 having a strength lower than that of ordinary concrete such as asphalt, brick, ALC, lightweight aerated concrete (ALC), and low-strength concrete. It is an anchor installation structure, and as shown in FIG. 6, for example, the anchor 1a is installed on a fragile base material 100 such as asphalt pavement. The installed anchor 1a is used for attaching the attachment 120a, and the attachment 120a such as a shock absorbing attachment is attached via the anchor 1a.

As shown in FIGS. 6 and 7, the anchor 1a in the anchor installation structure of the second embodiment is composed of an exterior body 2a and a fracture-inducing bolt 3a. The exterior body 2a is also formed in a bottomed cylindrical shape such as a bottomed cylinder, so that the uncured fixing material 5 does not penetrate into the inside from the lower side, and a female screw portion 21a is formed on the inner circumference thereof. There is. The fracture-inducing bolt 3a has the shape of a threaded rod composed of a shaft portion 32a, a male screw portion 33a is formed on the outer circumference of the shaft portion 32a, and the male screw portion 33a is screwed into the female screw portion 21a of the exterior body 2a. It has become so.

A fracture inducing portion 34a is formed in the fracture inducing bolt 3a at an intermediate position in the bolt axial direction of the shaft portion 32a, and the fracture inducing portion 34a has a strength lower than that of the male screw portion 33a screwed to at least the exterior body 2a in the bolt axial direction. Is formed of. Also in the second embodiment, the fracture inducing portion 34a is formed by being cut out so that the cross-sectional area of the shaft portion 32a of the fracture inducing bolt 3a becomes small. Similar to the first embodiment, the fracture inducing portion 34a in the second embodiment is preferably formed in a substantially polygonal prism shape having a substantially polygonal cross-sectional shape, but has a substantially cylindrical shape such as a substantially circular cross-sectional shape. It is also possible not to form it in a substantially polygonal prism shape.

As described above, in the anchor installation structure of the second embodiment, the fracture inducing portion 34a can be formed into a shape other than the polygonal prism shape if the cross-sectional area is smaller than that of the shaft portion 32a. By forming the shape such as a column shape having one or more parallel surfaces on the outer peripheral portion, the fracture inducing portion 34a can be easily gripped by a tool such as a wrench, so that the fracture inducing portion 34a breaks and remains in the exterior body 2a. The work of removing the male screw portion 33a can be easily performed. Therefore, the fracture inducing portion 34a is preferably formed in a polygonal column shape such as a quadrangular prism or a hexagonal prism, and is preferably formed in a so-called oval cross-sectional shape having a set of parallel surfaces on the outer peripheral portion. .. The shape of the fracture-inducing portion 34a is the same as that in the fracture-inducing portion 34 of the anchor installation structure of the first embodiment.

It is desirable that the fracture inducing portion 34a is formed in a tapered shape so that the cross-sectional area on the side close to the male screw portion 33a screwed into the exterior body 2a is large. Alternatively, there is a slight notch near the neck of the male threaded portion 33a (the male threaded portion 33a protruding from the surface of the fragile base material 100) opposite to the male threaded portion 33a screwed into the exterior body 2a in the fracture inducing portion 34a. You may. According to this, when an impact force is applied to the attachment 120a, the fracture-inducing portion 34a surely breaks in the upper portion without breaking in the lower portion, so that it is easy to fit the tool in the remaining fracture-inducing portion 34a. Can be removed.

Also in the anchor installation structure of the second embodiment, as shown in FIG. 6, the exterior body 2a of the anchor 1a is opened to the bottomed hole 110 formed in the fragile base material 100 on the surface side of the fragile base material 100. Be housed. Then, the attachment 120a is placed on the surface of the fragile base material 100, the washer 6a is placed on the attachment 120a at a predetermined position, and the breakage induction bolt 3a is inserted into the through hole 121a of the attachment 120a and the through hole 61a of the washer 6a. Then, the male threaded portion 33a of the inserted fracture inducing bolt 3a is screwed into the female threaded portion 21a of the exterior body 2a housed in the bottomed hole 110, and the fracture inducing bolt 3a is fixed to the fragile base material 100. Further, a nut 7a is screwed from the outside of the washer 6a to the male screw portion 33a of the breakage inducing bolt 3a protruding from the washer 6a, and the attachment 120a is moved to the fragile base material 100 side by the screwed nut 7a and the washer 6a. It is pressed and fixed to the fragile base material 100, and the attachment 120a is supported by the anchor 1a and attached to the fragile base material 100.

Also in the anchor installation structure of the second embodiment, the fixing material 5 is filled in the gap of the bottomed hole 110, and the anchor 1a or the exterior body 2a is fixed to the fragile base material 100 by the cured fixing material 5. Also in the example of FIG. 6, the resin of the fixing material 5 is put in the bottomed hole 110 in advance, the exterior body 2a is embedded in the bottomed hole 110 into which the resin is injected, and then the resin is cured to cure the cured resin. The anchor 1a or the exterior body 2a is fixed to the fragile base material 100 by the fixing material 5.

In the fracture-inducing bolt 3a screwed to the exterior body 2a housed in the bottomed hole 110, the fracture-inducing bolt 3a protruding from the surface of the fragile base material 100 has a fracture at a predetermined position in the bolt axial direction. The trigger portion 34a is arranged. In this example, the fracture inducing portion 34a is arranged substantially in the through hole 61a of the washer 6a, and a part of the male screw portion 33a of the fracture inducing bolt 3a between the surface of the fragile base material 100 and the fracture inducing portion 34a. Is provided.

As shown in FIG. 8, when an impact force is applied to the attachment 120a attached by the anchor installation structure of the second embodiment and a shear load T is applied to the anchor 1a, the fragile base material 100 is destroyed or the exterior body 2a Stress is concentrated on the fracture-inducing portion 34a of the anchor 1a having a small cross-sectional area and low strength, and the fracture-inducing portion 34a breaks as shown by the white arrow in FIG. 8A. Further, even when a tensile load P is applied to the anchor 1a, the fracture-inducing portion 34a of the anchor 1a is similarly fractured without breaking the fragile base material 100 or damaging the exterior body 2a. Then, the fracture-inducing bolt 3a remaining in the fragile base material 100 grips the male screw portion 33a of the fracture-inducing bolt 3a exposed between the surface of the fragile base material 100 and the fracture-inducing portion 34a with a tool to form an exterior body. It is removed from 2a and removed from the fragile base material 100 (see FIG. 8B). When the fracture-inducing portion 34a has a substantially polygonal prism shape, the fracture-inducing portion 34a can be gripped with a tool and removed from the exterior body 2a.

The exterior body 2a from which the fracture-inducing bolt 3a that has been fractured has been removed is maintained in a state of being fixed to the fragile base material 100 by the cured fixing material 5. Therefore, another fracture-inducing bolt 3a having the same shape and size as that of the fracture-inducing bolt 3a that has been broken but not broken can be screwed to the exterior body 2 and reused, and the fixed exterior body 2a can be reused. A new anchor 1a is formed by screwing the male thread 33a of another fracture inducing bolt 3a different from the fracture inducing bolt 3a into the female thread 21a of the above to form a new anchor 1a, and to form an anchor installation structure. It can be regenerated.

The anchor installation structure of the second embodiment can exert a corresponding effect from the configuration corresponding to the anchor installation structure of the first embodiment. Further, when the fracture-inducing portion 34a is broken, the male screw portion 33a of the fracture-inducing bolt 3a remains in a protruding state from the surface of the fragile base material 100. Therefore, regardless of the degree of damage of the fracture-inducing portion 34a, a full-thread wrench or the like The fracture-inducing bolt 3a, which is easily broken by fitting the tool of No. 3 into the protruding male screw portion 33a, can be rotated and removed.

[Anchor installation structure of the third embodiment]
The anchor installation structure of the third embodiment according to the present invention is also an anchor installation structure in which the anchor 1b is installed on a fragile base material 100 having a strength lower than that of ordinary concrete. Anchor 1b is installed on the fragile base material 100. The installed anchor 1b is used for attaching an attachment, and an attachment such as a shock absorbing attachment is attached via the anchor 1b.

As shown in FIG. 9, the anchor 1b in the anchor installation structure of the third embodiment is composed of an exterior body 2b and a fracture-inducing bolt 3b. The exterior body 2b is formed in a substantially bottomed cylindrical shape such as a substantially bottomed cylindrical shape, has a shape in which the uncured fixing material 5 does not penetrate into the inside from the lower side, and has a head cone shape or the like at the bottom. A tapered portion 22b that gradually expands in diameter toward the bottom is formed. The outer body 2b has a tapered portion 22b so that it can exert an anchor effect in a state of being embedded in the fixing material 5. A female screw portion 21b is formed on the inner circumference of the exterior body 2b.

The fracture-inducing bolt 3b has the shape of a threaded rod composed of a shaft portion 32b, a male screw portion 33b is formed on the outer circumference of the shaft portion 32b, and the male screw portion 33b is screwed into the female screw portion 21b of the exterior body 2b. It has become so. A fracture inducing portion 34b is formed in the fracture inducing bolt 3b at an intermediate position in the bolt axial direction of the shaft portion 32b and at a position closer to the side opposite to the fragile base material 100, and the fracture inducing portion 34b is before and after the bolt axial direction. It is formed with a strength lower than the position. The configuration of the fracture-inducing portion 34b is the same as the configuration of the fracture-inducing portion 34a in the second embodiment.

In the anchor installation structure of the third embodiment, the exterior body 2b of the anchor 1b is housed in the bottomed hole 140 formed from the fragile base material 100 to the deep layer 130 located deeper than the fragile base material 100, and the exterior body 2b is fragile. It is housed so as to be open on the surface side of the base material 100. Then, the fracture-inducing bolt 3b is inserted into the attachment and washer (not shown), and the male-threaded portion 33b of the inserted fracture-inducing bolt 3b is screwed into the female-threaded portion 21b of the exterior body 2b housed in the bottom hole 140. The fracture-inducing bolt 3b is fixed to the fragile base material 100 and the deep layer 130 such as soil. Further, a nut (not shown) is screwed into the male screw portion 33b of the breakage inducing bolt 3b protruding from the washer, and the attachment is pressed toward the fragile base material 100 by the screwed nut and the washer to make the fragile base material 100. The attachment is supported by the anchor 1b and attached to the fragile base material 100.

In the anchor installation structure of the third embodiment, the fixing material 5 is filled in the gap of the bottomed hole 140, and the anchor 1b or the exterior body 2b is fixed to the fragile base material 100 and the deep layer 130 by the cured fixing material 5. In the example of FIG. 9, the resin of the fixing material 5 is put in the bottomed hole 140 in advance, the exterior body 2b is embedded in the bottomed hole 140 into which the resin is injected, and then the resin is cured to cure the cured resin. The anchor 1b or the exterior body 2b is fixed to the fragile base material 100 and the deep layer 130 by the fixing material 5.

In the fracture-inducing bolt 3b screwed to the exterior body 2b housed in the bottomed hole 140, the fracture-inducing bolt 3b protruding from the surface of the fragile base material 100 has a fracture at a predetermined position in the bolt axial direction. The inducing portion 34b is arranged, and a part of the male screw portion 33b of the fracture inducing bolt 3b is provided between the surface of the fragile base material 100 and the fracture inducing portion 34b.

Breakage of the fracture-inducing portion 34b of the fracture-inducing bolt 3b when an impact force is applied to the attachment attached by the anchor installation structure of the third embodiment, removal of the fracture-inducing bolt 3b that has been fractured, and brittleness due to the cured fixing material 5. The configuration for reusing the exterior body 2b, which is maintained in a state of being fixed to the base material 100, is the same as the configuration for the anchor installation structure of the second embodiment.

The anchor installation structure of the third embodiment can exert a corresponding effect from the configuration corresponding to the anchor installation structure of the second embodiment. Further, the tapered portion 22b of the exterior body 2b can exert an anchor effect in a state of being embedded in the fixing material 5, and the exterior body 2b can be pulled out and the fixing portion composed of the exterior body 2b and the fixing material 5 can be damaged. Can be prevented more reliably.

[Anchor installation structure of the fourth embodiment]
The anchor installation structure of the fourth embodiment according to the present invention is also an anchor installation structure in which the anchor 1c is installed on a fragile base material 100 having a strength lower than that of ordinary concrete. Anchor 1c is installed on the fragile base material 100. The installed anchor 1c is used for attaching an attachment, and an attachment such as a shock absorbing attachment is attached via the anchor 1c.

As shown in FIG. 10, the anchor 1c in the anchor installation structure of the fourth embodiment includes an exterior body 2c, a pipe body 8d, a shaft portion 32c and a male screw portion 33c having the same configuration as the fracture-inducing bolt 3b in the third embodiment. , A break-inducing bolt 3c having a break-inducing portion 34c. The inner diameter of the pipe body 8d is slightly larger than the outer diameter of the fracture inducing bolt 3c. The exterior body 2c is formed in a substantially bottomed cylindrical shape such as a substantially bottomed cylinder, and has a tapered surface 23c whose outer peripheral surface gradually expands in diameter toward the opposite side to the bottom, and is a base surface on the open side. The area of 24c is formed to be larger than the area of the corresponding portion of the normal cylinder. The outer body 2c can exert an anchor effect due to the greatly widened base surface 24c. A female screw portion 21c is formed on the inner circumference of the exterior body 2c.

In the anchor installation structure of the fourth embodiment, the exterior body 2c of the anchor 1c is housed in the bottomed hole 140 formed from the fragile base material 100 to the deep layer 130 located deeper than the fragile base material 100, and the exterior body 1c is fragile. It is housed so as to be open on the surface side of the base material 100. For accommodating the exterior body 2c, for example, a part of a bottomed hole 140 substantially corresponding to the shape and size of the exterior body 2c is formed in the deep layer 130 to accommodate the exterior body 2c, and then a fragile base material such as asphalt pavement is accommodated. The 100 is formed on the deep layer 130, and the remaining portion of the bottomed hole 140 is arranged at a position corresponding to the outer body 2c containing the fragile base material 100, and the pipe body 8d having a diameter smaller than the outer peripheral edge of the base surface 24c is arranged. It is performed by forming by. It is preferable to inject the fixing material 5 into the fragile base material 100 around the outer peripheral surface of the pipe body 8d, but it is also possible not to inject the fixing material 5.

Then, the fracture-inducing bolt 3c is inserted into the attachment and washer (not shown), and the male screw portion 33c of the inserted fracture-inducing bolt 3c is passed through the inside of the pipe body 8d housed in the bottom hole 140, and the female screw portion 21c of the exterior body 2c is passed. The rupture-inducing bolt 3c is fixed to the fragile base material 100 and the deep layer 130 such as concrete. Further, a nut (not shown) is screwed into the male screw portion 33c of the breakage inducing bolt 3c protruding from the washer, and the attachment is pressed toward the fragile base material 100 by the screwed nut and the washer to make the fragile base material 100. The attachment is supported by the anchor 1c and attached to the fragile base material 100.

In the anchor installation structure of the fourth embodiment, the exterior body 2c is located in the deep layer 130, and is restrained by the pipe body 8d arranged on the fragile base material 100 with a smaller diameter than the outer peripheral edge of the base surface 24c to become the fragile base material 100. It is well established. In the example of FIG. 10, the male screw portion 33c of the break induction bolt 3c is screwed into the female screw portion 21c of the exterior body 2c housed in the bottom hole 140, while the pipe body 8d arranged in the fragile base material 100 is around. A resin that fills the voids in the fragile base material 100 and fixes the pipe body 8d to the fragile base material 100 is injected, and the deep layer 130 restrained by the pipe body 8d fixed to the fragile base material 100 by the fixing material 5 of this cured resin. The movement of the exterior body 2c is prevented, and the anchor 1c is fixed to the fragile base material 100 and the deep layer 130 or the fragile base material 100.

In the fracture-inducing bolt 3c screwed to the exterior body 2c housed in the bottomed hole 140, the fracture-inducing bolt 3c protruding from the surface of the fragile base material 100 has a fracture at a predetermined position in the bolt axial direction. The inducing portion 34c is arranged, and a part of the male screw portion 33c of the fracture inducing bolt 3c is provided between the surface of the fragile base material 100 and the fracture inducing portion 34c. The configuration of the fracture-inducing portion 34c of the fracture-inducing bolt 3c when an impact force is applied to the attachment attached in the anchor installation structure of the fourth embodiment is the same as the configuration in the anchor installation structure of the third embodiment. is there.

The anchor installation structure of the fourth embodiment can exert a corresponding effect from the configuration provided corresponding to the anchor installation structure of the second embodiment. Further, the anchor effect can be exhibited by restraining the base surface 24c of the exterior body 2c by the pipe body 8d arranged on the fragile base material 100.

[Scope of Scope of Inventions Disclosure of the Present Specification]
The invention disclosed in the present specification is specified by changing the partial contents thereof to other contents disclosed in the present specification to the extent applicable, in addition to the inventions listed as inventions and the embodiments. Or, those specified by adding other contents disclosed in the present specification to these contents, or those specified by deleting these partial contents to the extent that a partial effect can be obtained and making them into a higher concept. Including. The invention disclosed in the present specification also includes the following additional contents and modifications.

For example, in the first to third embodiments, the fixing material 5 is filled in the gaps between the bottomed holes 110 and 140, and the anchors 1, 1a, 1b and 1c and the exterior bodies 2, 2a and 2b are fixed by the cured fixing material 5. For example, the expansion piece at the tip of the exterior body is expanded to bite into the peripheral wall of the bottomed hole, the exterior body is mechanically fixed, and a break-inducing bolt is screwed to the female screw portion at the rear of the exterior body. The present invention also includes a configuration for fixing an anchor or an exterior body without using a fixing material.

Further, in the first to fourth embodiments, the fracture inducing portion 34 and the like are formed in a polygonal column shape or an oval cross-section as a suitable configuration for easy gripping with a tool. Not limited. For example, a portion having a parallel surface that can be easily gripped with a wrench or the like on the outer peripheral portion may be formed separately from the fracture-inducing portion and arranged on the exterior body side of the fracture-inducing portion. In this case, the portion provided with the parallel surface is arranged at a position protruding from the surface of the exterior body.

Further, the fracture inducing portion in the present invention includes an appropriate fracture inducing portion that is provided at a predetermined position in the bolt axial direction and has at least a lower strength than the male screw portion that is screwed into the exterior body, and is, for example, another material having a low strength. It is also possible to form a fracture-inducing portion, or to modify the fracture-inducing portion or its front and rear to reduce the strength of the fracture-inducing portion, and notch so that the cross-sectional area of the shaft portion becomes smaller. It is not limited to the fracture-inducing portion formed in the shape. The present invention also includes a configuration in which a male screw portion of a fracture-inducing bolt different from the fracture-inducing bolt that is different from the fracture-inducing bolt cannot be screwed into the female-threaded portion of the fixed exterior body and reused.

The present invention can be used when attaching an attachment such as a protective fence to a fragile base material such as asphalt via an anchor.

1, 1a, 1b, 1c ... Anchor 2, 2a, 2b, 2c ... Exterior body 21, 21a, 21b, 21c ... Female threaded portion 22b ... Tapered portion 23c ... Tapered surface 24c ... Base surface 3, 3a, 3b, 3c ... Breaking Inducing bolt 31 ... Head 32, 32a, 32b, 32c ... Shaft 33, 33a, 33b, 33c ... Male threaded portion 34, 34a, 34b, 34c ... Breakage inducing part 4 ... Washer 41 ... Through hole 5 ... Fixing material 6a ... Washer 61a ... Through hole 7a ... Nut 8d ... Pipe body 100 ... Fragile base material 110, 140 ... Bottom hole 120, 120a ... Attachment 121, 121a ... Through hole 130 ... Deep layer 200 ... Anchor 210 ... Sleeve 211 ... Female screw 220 ... Threaded rod 221 ... Male screw 230 ... Fragile base material 231 ... Bottomed hole 240 ... Adhesive material P ... Tensile load T ... Shear load

Claims (7)

An installation structure in which an anchor composed of an exterior body having a female threaded portion formed on the inner circumference and a fracture-inducing bolt having a male threaded portion screwed to the female threaded portion of the exterior body formed on the outer circumference is installed on a fragile base material. There,
The exterior body is housed in a bottomed hole formed in the fragile base material or a bottomed hole formed from the fragile base material to a deep layer at a position deeper than the fragile base material.
The male threaded portion of the fracture inducing bolt is screwed into the female threaded portion of the exterior body to fix the fracture inducing bolt to the fragile base material, and at the same time.
A fracture-inducing portion having a strength lower than that of the male-threaded portion screwed into the exterior body is provided at a predetermined position in the bolt axial direction in the protruding portion of the fracture-inducing bolt protruding from the surface of the fragile base material. Anchor installation structure featuring. The anchor installation structure according to claim 1, wherein the fracture-inducing portion is formed in a notch shape so that the cross-sectional area of the shaft portion of the fracture-inducing bolt is reduced. The anchor installation structure according to claim 2, wherein the fracture-inducing portion is formed in a substantially polygonal prism shape. The anchor installation structure according to any one of claims 1 to 3, wherein a male threaded portion of the fracture-inducing bolt is provided between the surface of the fragile base material and the fracture-inducing portion. The anchor installation structure according to any one of claims 1 to 4, wherein the voids of the bottomed holes are filled with a fixing material, and the anchor is fixed by the cured fixing material. When the fracture-inducing bolt is broken at the fracture-inducing portion in the anchor installation structure according to any one of claims 1 to 5, the remaining portion of the fracture-inducing bolt broken at the fracture-inducing portion is removed from the exterior body. ,
A method for regenerating an anchor installation structure, which comprises removing the remaining portion and attaching another fracture-inducing bolt to the remaining exterior body. An installation structure of a shock absorbing attachment installed via the anchor of the anchor installation structure according to any one of claims 1 to 5.
The shock-absorbing attachment is provided so as to absorb the impact by deformation, and the deformation of the shock-absorbing attachment occurs with a force smaller than the force for breaking the fracture-inducing portion of the fracture-inducing bolt. The installation structure of the shock absorbing attachment, which is characterized by being provided in.

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