JP7094627B2 - Post-installed anchors and their construction methods - Google Patents

Description

The present invention relates to post-installed anchors that can be installed on various base materials such as asphalt, lightweight aerated concrete, bricks, and concrete, and construction methods thereof.

Conventionally, when fixing an attachment to a base material such as concrete, a post-installed anchor is placed on the base material, and the attachment is fixed by the post-installed anchor. As such a post-installed anchor, in Patent Document 1, an anchor hole having an enlarged diameter hole portion of an upper constriction is formed in a concrete base material, and the screw rod and the screw rod are screwed into the upper constriction. Anchor hardware consisting of a tapered nut having a tapered portion and a diameter-expanding metal fitting in which an expansion piece that is expanded by contacting the tapered portion of the tapered nut is formed in a skirt shape at the bottom of the ring body is inserted into the anchor hole. After being inserted, the expanded piece expanded by pushing down the diameter-expanding metal fitting by driving the driving rod is engaged with the enlarged-diameter hole, and the gap between the screw rod and the concrete in the anchor hole is filled with the filler. The structure of the anchor is disclosed.

In the diameter-expanding metal fitting in Patent Document 1, an expansion piece partitioned by a vertical notch is continuously provided on the ring body via a thin-walled hinge portion, and the thin-walled hinge portion between the ring body and the expansion piece is provided on the outside. It is formed by providing a groove-shaped recess. Then, in the concrete base material, the expansion piece is expanded so that the ratio of the outer diameter of the expansion piece after expansion to the outer diameter of the expansion piece before expansion is about 1.4 times, and the post-installed anchor is installed. It is fixed to concrete (see FIGS. 1 to 4 of Patent Document 1).

Japanese Patent No. 3636632

By the way, in the post-construction anchor of Patent Document 1, since the base material to be fixed is high-strength concrete, the ratio of the outer diameter of the expanded piece after expansion to the outer diameter of the expanded piece before expansion (expansion rate). ) Is about 1.4 times, but in addition to the engaging force of the expansion piece with the enlarged hole, the fixing force of the screw rod and concrete by friction is also added to the fixing force, but the base material to be fixed is asphalt and lightweight bubbles. In the case of a fragile base material such as concrete (ALC) and brick, it is difficult to fix it by friction. In addition, with this type of post-installed anchor, it is necessary to form a hole for anchor placement that is deep to some extent in order to obtain the required post-installed anchor embedding length. There is also the problem of being inferior.

Further, since the installation structure of the post-installed anchor in Patent Document 1 is a structure that requires that a resin or mortar filler is injected and filled in the gap between the screw rod and the concrete in the anchor hole, this is the case. From this point as well, there is also the problem that it takes time and effort to inject the filler and, by extension, to construct the post-installed anchors.

The present invention is proposed in view of the above problems, and has high versatility that can be installed on various base materials including fragile base materials, and post-installed anchors that can improve the efficiency of construction work. The purpose is to provide the construction method.

In the post-installed anchor of the present invention, an expansion piece is provided near the tip of the bolt, which is divided by cutting a slit until it reaches a thin-walled hinge portion having an annular groove on the outer circumference, and is tapered inside the expansion piece. It is a post-installed anchor that allows the expansion piece to be expanded by allowing the portions to enter relatively, and the ratio of the outer diameter of the expansion piece after expansion to the outer diameter of the expansion piece before expansion is 1. It is characterized by being 5 times or more.
According to this, even when the base material to which the post-installed anchors are placed is asphalt, lightweight cellular concrete (ALC), fragile base material such as bricks, or soft base material, the expansion piece is greatly expanded and fixed. be able to. Therefore, it can be installed on various base materials including fragile base materials, and versatility can be enhanced. In addition, since the expansion piece is greatly expanded and fixed, the embedding length of the post-installed anchor can be made shallow, and the drilling for anchor placement can be made shallow, so that the labor required for the drilling work can be reduced. Post-installed anchor construction work can be streamlined. Further, when a resin or mortar filler is injected into the drilling for anchor placement and installed without filling, it is possible to improve the efficiency of the post-installed anchor construction work from this point as well.

In the post-installed anchor of the present invention, the expansion piece is provided at the annular base of the expansion sleeve via the thin hinge portion, and the stepped nut having a small diameter portion and a large diameter portion having a larger diameter than the small diameter portion is the large diameter portion. The bolt is screwed into the tip of the bolt with the diameter portion on the tip side, the expansion sleeve is externally inserted into the small diameter portion of the stepped nut, the base portion is brought into contact with the large diameter portion, and the tip portion is contacted with the tip portion. The sleeve on which the tapered portion is formed is externally attached to the bolt and is provided in contact with the expansion piece of the expansion sleeve.
According to this, the expansion piece is expanded in an umbrella shape with the bottom of the perforation of the base metal to which the post-installed anchor is placed as the top side, and the expanded expansion piece is the stepped portion of the enlarged hole portion of the perforation. It is possible to hook it in the shape of an anchor on the hole wall of the perforation. As a result, the fixing strength of the post-installed anchor can be further increased, and the required fixing strength can be obtained even if the embedded length of the post-installed anchor is made shallower. Further, since the bolt can be removed and replaced while the stepped nut is left in the perforation, excellent maintainability can be exhibited.

In the post-installed anchor of the present invention, a cone nut provided with the tapered portion on the rear side is screwed into the tip portion of the bolt, and the thin-walled hinge portion is inserted into the front portion of the sleeve externally inserted into the bolt. The expansion piece is provided, the expansion piece is arranged so as to abut on the tapered portion of the cone nut, and the tip portion of each of the expansion pieces is formed in a blade shape.
According to this, the base material to which the post-installed anchors are placed can be scraped with the blade-shaped tip of the expansion piece, and the expanded expansion piece can be locked to the base material, and a separately enlarged hole portion can be provided. Work using a drill bit or the like for forming becomes unnecessary, and the work of post-installed anchors can be made more efficient. In addition, since the expanded piece in the expanded state in which the base material is scraped can be directly locked to the hole wall of the base material, the frictional force between the expanded piece and the hole wall and the fixing strength can be increased, and post-installation is performed. The required fixing strength can be obtained even if the embedded length of the anchor is made shallower. Further, since the bolt can be removed and replaced while the cone nut remains in the drilling, excellent maintainability can be exhibited.

The post-installed anchor of the present invention is characterized in that a position confirmation portion for confirming the depth of the perforation into which the post-installed anchor is placed is provided at a predetermined position in the length direction of the sleeve.
According to this, it is possible to easily confirm that the stepped nut or the cone nut is in contact with the bottom of the drilling and the drilling depth is such that the expansion piece can be properly expanded, and the efficiency and accuracy of the construction work can be confirmed. Can be further enhanced.

The method of constructing the post-construction anchor of the present invention is the method of constructing the post-construction anchor of the present invention, and the first step of forming a perforation having an enlarged diameter hole in the vicinity of the bottom in the base material of the existing structure. The second step of inserting the post-construction anchor in the non-expanded state into the perforation from the stepped nut side, the sleeve is driven, and the tapered portion of the sleeve is inserted into the inside of the expansion piece. It is characterized by comprising a third step of expanding the expanded piece and locking the expanded piece to the enlarged diameter hole portion.
According to this, the expansion piece is expanded in an umbrella shape with the bottom of the perforation of the base metal to which the post-installed anchor is placed as the top side, and the expanded expansion piece is the stepped portion of the enlarged hole portion of the perforation. Can be hooked in an anchor shape. Therefore, the fixing strength of the post-installed anchor can be further increased, and the required fixing strength can be obtained even if the embedded length of the post-installed anchor is made shallower.

The post-installed anchor construction method of the present invention is the post-installed anchor construction method of the present invention, in which the first step of forming a straight perforation in the base material of an existing structure and the cone nut and the sleeve are described. The second step of inserting the expansion piece into the perforation from the cone nut side so as to abut the tapered portion of the cone nut, and pushing the sleeve into the perforation while rotating the sleeve to push the tapered portion of the cone nut into the perforation. The expansion piece is relatively inserted into the inside of the expansion piece to expand the expansion piece, and the base material is scraped by the blade-shaped tip portion of the expansion piece, and the expanded expansion piece is engaged with the base material. It is characterized by comprising a third step of stopping.
According to this, the base material to which the post-installed anchors are placed can be scraped with the blade-shaped tip of the expansion piece, and the expanded expansion piece can be locked to the base material, and a separately enlarged hole portion can be provided. Work using a drill bit or the like for forming becomes unnecessary, and the work of post-installed anchors can be made more efficient. In addition, since the expanded piece in the expanded state in which the base material is scraped can be directly locked to the hole wall of the base material, the frictional force between the expanded piece and the hole wall and the fixing strength can be increased, and post-installation is performed. The required fixing strength can be obtained even if the embedded length of the anchor is made shallower.

The post-installed anchor construction method of the present invention is characterized in that the base material is a fragile base material.
According to this, even when the base material to which the post-installed anchors are placed is a fragile base material such as asphalt, lightweight cellular concrete (ALC), brick, etc., the expansion piece can be greatly expanded and fixed. For example, even when the thickness of the base material on which the post-installed anchor is placed is thin, the post-installed anchor can be placed with a shallow embedding length and a required fixing strength. In addition, it is possible to avoid fixing with a strength that is too strong for the base metal, and it is possible to limit the breaking range of the base metal to a local range when a destructive force of the post-installed anchor is applied.

According to the present invention, it can be used as a post-installed anchor having high versatility that can be installed on various base materials including a fragile base material, and the construction work can be made more efficient.

(A) is an exploded perspective view of the post-installed anchor according to the first embodiment according to the present invention, and (b) is a perspective view of a sleeve and an expansion sleeve in the post-installed anchor according to the first embodiment. (A) is a left side view of the expansion sleeve in the post-installed anchor according to the first embodiment, (b) is a front view thereof, and (c) is a vertical sectional view thereof. (A) is a front view of a sleeve, an expansion sleeve, and a stepped nut in a post-installed anchor according to the first embodiment, and (b) is a vertical sectional view thereof. (A) is a partial vertical sectional view of the post-installed anchor in the expanded state after the first embodiment, and (b) is a right side view thereof. (A) to (g) are explanatory views explaining the procedure of constructing the post-installed anchor after the first embodiment. (A) is a vertical cross-sectional view of an example of a drill bit used as a post-installed anchor in the first embodiment, and (b) is a vertical cross-sectional view of a state in which the bottom expansion blade is expanded with the drill bit. (A) is an exploded perspective view of the post-installed anchor according to the second embodiment according to the present invention, and (b) is a perspective view of a sleeve and a cone nut in the post-installed anchor according to the second embodiment. (A) is a front view of the sleeve in the post-installed anchor according to the second embodiment, (b) is a right side view thereof, and (c) is a vertical sectional view thereof. (A) is a front view of a sleeve and a cone nut in a post-installed anchor according to the second embodiment, and (b) is a vertical sectional view thereof. (A) is a partial vertical sectional view of the post-installed anchor in the expanded state after the second embodiment, and (b) is a right side view thereof. (A) to (f) are explanatory views explaining the procedure of constructing the post-installed anchor after the second embodiment. The perspective view which shows the example which installed the erection structure using the post-installed anchor of the 1st Embodiment. Explanatory drawing explaining the fracture behavior in post-installed anchor of 1st Embodiment.

[Post-installed anchors and their construction methods according to the first embodiment]
The post-installed anchor 1 according to the first embodiment according to the present invention is a metal expansion type anchor, and as shown in FIGS. 1 to 4, the sleeve 11, the expansion sleeve 12, the stepped nut 13, and the full screw bolt are used. A certain bolt 14 is provided, and after being placed, a washer 15 is externally inserted into the rear end portion of the bolt 14 of the construction anchor 1, and a nut 16 is screwed from the outside thereof.

The sleeve 11 has a substantially cylindrical shape, and a tapered portion 111 that inclines inward toward the tip is formed at the tip thereof, and the rear end surface 113 is a hitting surface that is hit by a hammer or the like. .. The rear part of the sleeve 11 is provided with a position confirmation portion 112 for confirming whether the embedding depth of the post-installed anchor 1 and the perforation depth of the perforation into which the post-installed anchor 1 is placed are in the correct positions. There is. The position confirmation portion 112 of the present embodiment is provided in a knurled shape and a circumferential shape at a predetermined position in the length direction of the sleeve 11.

In the expansion sleeve 12, a plurality of expansion pieces 122 that can be expanded are erected on the annular base 121 via the thin-walled hinge portion 123, and an annular groove 124 is provided on the outer periphery of the thin-walled hinge portion 123. There is. A slit 125 cut between one expansion piece 122 and the thin-walled hinge portion 123 and another expansion piece 122 and the thin-walled hinge portion 123 adjacent thereto from the opposite side of the base 121 until reaching the thin-walled hinge portion 123. It is divided by. The end surface of each expansion piece 122 opposite to the base 121 is an inclined surface 126 that inclines inward.

The stepped nut 13 is formed of a small diameter portion 131 and a large diameter portion 132 having a larger diameter than the small diameter portion 131 and projecting outward from the outer peripheral surface of the small diameter portion 131 in an annular shape, and communicates the small diameter portion 131 and the large diameter portion 132. A female screw 133 for screwing the bolt 14 is formed so as to do so. The outer diameter of the small diameter portion 131 is formed to be slightly smaller than the inner diameter of the expansion sleeve 12, the outer diameter of the large diameter portion 132 is formed to be larger than the inner diameter of the expansion sleeve 12, and the small diameter portion 131 is inserted into the expansion sleeve 12. It is possible, and the large diameter portion 132 can come into contact with the base portion 121 in a state where the small diameter portion 131 is inserted from the base portion 121 side of the expansion sleeve 12.

In the post-installed anchor 1, the inclined surface 126 of the expansion piece 122 of the expansion sleeve 12 is arranged so as to abut on the tapered portion 111 at the tip of the sleeve 11. Further, the small diameter portion 131 of the stepped nut 13 is inserted into the expansion sleeve 12, and the large diameter portion 132 of the stepped nut 13 is arranged so as to abut on the base 121 of the expansion sleeve 12, in other words, the expansion sleeve 12. Is extrapolated to the small diameter portion 131 of the stepped nut 13, and the base portion 121 is brought into contact with the large diameter portion 132. Then, the tip of the bolt 14 inserted into the sleeve 11 and the expansion sleeve 12 is screwed into the female screw 133 of the stepped nut 13 having the large diameter portion 132 on the tip side to be integrated. When not in use, in this screwed state, the sleeve 11 externally inserted into the bolt 14 or the tapered portion 111 thereof is provided so as to abut against the expansion piece 122 of the expansion sleeve 12, and the expansion piece 122 is maintained in the non-expanded state. To. The expansion piece 122 of the expansion sleeve 12 is provided so as to be arranged near the tip of the bolt 14 inserted and screwed into the stepped nut 13.

When constructing the post-installed anchor 1 according to the first embodiment, for example, a perforation 31 having an enlarged diameter hole 33 is formed in the vicinity of the bottom portion 32 in the base material 30 of the existing structure. As an example of the process of forming the perforation 31, for example, a perforation 31 is formed in the base material 30 with a straight hole forming drill bit 41, and the inside of the perforation 31 is cleaned with a cleaning tool 42 (FIGS. 5A and 5B). reference). After that, using the drill bit 51 for forming the enlarged hole, the drill bit 51 for forming the enlarged hole is inserted into the drill 31 until the tip of the drill bit 51 for forming the enlarged hole substantially abuts on the bottom 32 of the drill 31. Then, the diameter-expanding blades 571 and 571 are expanded to protrude outward from the diameter-expanding blade entry / exit windows 565 and 565 to form a tapered diameter-expanded hole portion 33 near the bottom of the drilling 31 (see FIG. 5 (c)). ). The diameter-expanded hole portion 33 corresponds to a ratio of the outer diameter D2 of the expansion piece 122 after expansion to the outer diameter D1 of the expansion piece 122 before expansion of the expansion sleeve 12, which will be described later, to be 1.5 times or more. It is formed in the same size. After the enlarged hole portion 33 is formed, the inside of the drilling 31 is cleaned again with the cleaning tool 42 (see FIG. 5D).

Here, an appropriate drill bit 51 for forming the enlarged hole portion can be used, but it is preferable to use, for example, the one having the configuration shown in FIG. The drill bit 51 for forming an enlarged hole in FIG. 6 includes a shank sleeve 52, an intermediate sleeve 53 provided on the tip end side of the shank sleeve 52, a compression coil spring 54 built in the intermediate sleeve 53, and an intermediate sleeve 53. The sleeve joint 55 provided on the tip side, the bottom-expanding sleeve 56 provided at the tip of the drill bit 51, the bottom-expanding blade 57 fixedly installed in the bottom-expanding sleeve 56, and extending from the shank sleeve 52 to the bottom-expanding sleeve 56. It has a shaft 58 having a substantially cylindrical rod shape.

The shank sleeve 52 includes a shank portion 521 attached to a hammer drill or the like, and a substantially bottomed cylindrical sleeve portion 522 provided on the tip end side of the shank portion 521, and projects outward toward the rear of the sleeve portion 522. A stepped surface 523 is formed. The rear portion of the shaft 58 is fitted into the sleeve portion 522 and pin-coupled. Further, the intermediate sleeve 53 is a substantially cylindrical member, and a female screw 531 is formed on the inner peripheral surface of the tip portion, and a long hole-shaped stroke guide extending in the axial direction is formed at a position facing the rear portion. 532 is formed on the peripheral wall. A male screw 551 on the rear side of the sleeve joint 55 is screwed into the female screw 531 and a sleeve portion 522 of the shank sleeve 52 is inserted into the rear side of the intermediate sleeve 53, and the rear end surface of the sleeve joint 55 and the front end of the sleeve portion 522. A compression coil spring 54 is built in the intermediate sleeve 53 so as to be located between the surfaces.

The shaft 58 fixed to the shank sleeve 52 is installed in the intermediate sleeve 53 so as to pass through the inside of the compression coil spring 54. Further, a guide screw 533 is attached to the front portion of the sleeve portion 522 inserted into the intermediate sleeve 53, and the guide screw 533 is provided so as to be hooked on the stroke guide 532. Due to the configuration in which the guide screw 533 moves along the stroke guide 532, the intermediate sleeve 53 cannot rotate with respect to the shank sleeve 52 and the shaft 58, and the rotational force of the shank sleeve 52 can be transmitted to the bottom expansion sleeve 56. The shank sleeve 52 and the shaft 58 can be pushed toward the bottom expansion sleeve 56 side by smooth movement along the stroke guide 532.

The sleeve joint 55 has a male screw 553 on the front side sandwiching the base 552 in addition to the male screw 551 on the rear side, and the male screw 553 is screwed into a female screw 561 formed on the inner peripheral surface of the rear portion of the bottom expansion blade 56. There is. That is, the intermediate sleeve 53 and the bottom-expanding sleeve 56 are screwed to the sleeve joint 55, respectively, and the intermediate sleeve 53 and the bottom-expanding sleeve 56 are fixed in a state in which they cannot rotate with each other during the rotational operation of the drill bit 51 for forming the enlarged diameter hole. Has been done. Further, the shaft 58 is also inserted into the sleeve joint 55, and the shaft 58 is provided so as to reach the inside of the bottom expansion sleeve 56.

The bottom-expanding sleeve 56 has a substantially bottomed cylindrical shape in which a substantially conical tip portion 562 is formed, and a female screw 561 into which the male screw 553 of the sleeve joint 55 is screwed is formed on the inner peripheral surface of the rear portion. A fitting groove 563 in which the bottom-expanding blade 57 is fitted is formed inside the tip portion 562 of the bottom-expanding sleeve 56, and a diameter-expanding blade entry / exit window 565 is formed at a position of the peripheral wall 564 facing the fitting groove 563 in the extending direction. 565 is formed.

The bottom expansion blade 57 is composed of a pair of expansion blades 571 and 571 and a torsion coil spring 572 that supports and tightens the pair of expansion blades 571 and 571 on the tip side so as to be tiltable. The diameter-expanding blade 571 has a blade material 573 such as a cemented carbide tip on the outside, and its rear end surface is an inclined surface that inclines toward the tip inward. An inclined groove 574 is formed inward of the rear end surface so as to facilitate the entry of the stepwise or gradually tapered tip portion of the shaft 58 inwardly toward the tip end surface at a steeper angle than the rear end surface. ing. When the inner side surfaces of the pair of enlarged diameter blades 571 and 571 are combined, a shape that is recessed in a valley shape on the tip side of the rear end faces is formed, and a substantially conical hole is formed in the inclined grooves 574 and 574. It has become.

Then, after the steps of FIGS. 5A to 5D, as shown in FIG. 5E, the expansion piece 122 is integrated with the bolt 14 in the non-expanded state, and then the post-installed anchor 1 is attached to the stepped nut. Inserted into the perforation 31 from the 13 side, the stepped nut 13 is arranged so as to abut on the bottom 32 of the perforation 31, and the position confirmation portion 112 is located on the surface of the base metal 30 to embed the post-installed anchor 1. Alternatively, confirm that the drilling depth of the drilling 31 is correct. Then, the open end surface 431 of the substantially bottomed cylindrical driving tool 43 is brought into contact with the rear end surface 113 of the sleeve 11, and the rear end of the driving tool 43 is hit with a hammer 44 to drive the sleeve 11. By this driving, the tapered portion 111 of the sleeve 11 relatively enters the inside of the plurality of expansion pieces 122, the expansion piece 122 expands, and the post-installed anchor 1 is driven. Here, in the expanded expansion piece 122 of the expansion sleeve 12, the ratio of the outer diameter D2 of the expansion piece 122 after expansion to the outer diameter D1 of the expansion piece 122 before expansion is 1.5 times or more. It is expanded (see FIG. 4), and the plurality of expanded expansion pieces 122 form a locking portion of the post-installed anchor 1 and are engaged with the enlarged diameter hole portion 33 (see FIG. 5 (f)).

After that, the mounting plate 45 of the required structure to be attached by the post-construction anchor 1 is arranged so as to be inserted into the bolt 14 protruding from the base material 30 of the existing structure, and the washer 15 is bolted 14 from the outside of the mounting plate 45. The nut 16 is screwed onto the bolt 14 from the outside thereof, and the required structure is attached to the base material 30 of the existing structure (see FIG. 5 (g)).

According to the first embodiment, even when the base material 30 on which the post-installed anchor 1 is placed is asphalt, lightweight aerated concrete (ALC), a fragile base material such as brick, or a soft base material, the expansion piece 122 Can be greatly expanded and fixed. Therefore, it can be installed on various base materials including fragile base materials, and versatility can be enhanced. Further, since the expansion piece 122 is greatly expanded and fixed, the embedding length of the post-installed anchor 1 can be made shallow, and the drilling 31 for anchor placement can also be made shallow, so that the labor required for the drilling work can be reduced. It is possible to improve the efficiency of the construction work of the post-installed anchor 1. Further, even when the thickness of the base metal 30 is limited, it can be attached by the post-installed anchor 1. When a resin or mortar filler is injected into the perforation 31 for anchor placement and installed without filling, it is possible to improve the efficiency of the post-installed anchor 1 construction work from this point as well. be.

Further, in the post-installed anchor 1 of the first embodiment, the expansion piece 122 is expanded in an umbrella shape with the bottom portion 32 of the perforation 31 of the base material 30 to be placed as the top side, and the expanded piece 122 is expanded. It is possible to hook the hole wall of the hole 31 such as the stepped portion of the enlarged hole 33 of the hole 31 in an anchor shape. As a result, the fixing strength of the post-installed anchor 1 can be further increased, and the required fixing strength can be obtained even if the embedded length of the post-installed anchor 1 is made shallower. Further, since the bolt 14 can be removed and replaced while the stepped nut 13 remains in the perforation, excellent maintainability can be exhibited.

Further, the position confirmation portion 112 makes it possible to easily confirm that the stepped nut 13 is in contact with the bottom portion 32 of the drilling 31 and the drilling depth is such that the expansion piece 122 can be properly expanded, and the efficiency of the construction work can be confirmed. It is possible to further improve the sex and accuracy.

[Post-installed anchors and their construction methods after the second embodiment]
The post-installed anchor 2 according to the second embodiment of the present invention is also a metal expansion type anchor, and as shown in FIGS. 7 to 10, includes a sleeve 21, a cone nut 22, and a bolt 23 which is a full screw bolt. After being placed, a washer 24 is externally inserted into the rear end portion of the bolt 23 of the construction anchor 2, and the nut 25 is screwed from the outside thereof.

The sleeve 21 has a substantially cylindrical shape, and a plurality of expansion pieces 213 are erected on the front portion of the sleeve 21 via a thin-walled hinge portion 212 provided with an annular groove 211 on the outer periphery. One expansion piece 213 and the thin-walled hinge portion 212, and another expansion piece 213 and the thin-walled hinge portion 212 adjacent thereto are separated by a slit 214 cut from the front side until reaching the thin-walled hinge portion 212. There is. An obliquely inclined blade-shaped blade portion 2131 is formed at the tip end portion of each expansion piece 213.

The rear part of the sleeve 21 is provided with a position confirmation portion 215 for confirming whether the embedding depth of the post-installed anchor 2 and the perforation depth of the perforation in which the post-installed anchor 2 is placed are in the correct positions. The position confirmation unit 215 of the second embodiment is also provided in a knurled shape at a predetermined position in the length direction of the sleeve 21. Further, on the inner circumference of the rear portion of the sleeve 21, a female screw 216 into which a rotation bolt 46 gripped by a special jig 47 for rotating the sleeve 21 is screwed is formed.

The cone nut 22 is provided with a tapered portion 222 on the rear side of the annular base portion 221 whose outer diameter gradually decreases toward the rear, and the bolt 23 is screwed so as to communicate the tapered portion 222 and the base portion 221. A matching female screw 223 is formed.

In the post-installed anchor 2, the expansion piece 213 at the front portion of the sleeve 21 is arranged so as to abut against the tapered portion 222 at the rear portion of the cone nut 22. Then, the tip of the bolt 23 inserted into the sleeve 21 is screwed into the female screw 223 of the cone nut 22 with the base 221 on the tip side to be integrated. In this screwed state when not in use, the expansion piece 213 at the front of the sleeve 21 externally inserted into the bolt 23 is provided so as to come into contact with the tapered portion 222 of the cone nut 22 screwed to the tip of the bolt 23. The expansion piece 213 is maintained in a non-expanded state. The expansion piece 213 of the sleeve 21 is provided so as to be arranged near the tip of the bolt 23 screwed into the cone nut 22.

When constructing the post-installed anchor 2 according to the second embodiment, for example, a straight perforation 34 is formed in the base material 30 of the existing structure. When forming the perforation 34, for example, the perforation 34 is formed in the base material 30 with a straight hole forming drill bit 41, and the inside of the perforation 34 is cleaned with a cleaning tool 42 (see FIGS. 11A and 11B). ).

After that, the cone nut 22 and the sleeve 21 of the post-installed anchor 2 are inserted into the drilling 34 from the cone nut 22 side so that the expansion piece 213 abuts on the tapered portion 222 of the cone nut 22, and the cone nut 22 is punched in the drilling 34. Arranged so as to be in contact with the bottom portion 35, the position confirmation portion 215 is located on the surface of the base metal 30, and it is confirmed that the embedding depth of the post-installed anchor 2 or the drilling depth of the drilling 34 is correct (FIG. 11). See (c)).

After that, the rotation bolt 46 is screwed and attached to the female screw 216 of the sleeve 21, the head of the rotation bolt 46 is gripped by the special jig 47, and the special jig is shown as shown by the thick line arrow in FIG. 11 (d). At 47, the sleeve 21 is rotated via the rotation bolt 46, and the sleeve 21 is pushed into the drilling 34. By this operation, the tapered portion 222 of the cone nut 22 relatively enters the inside of the expansion piece 213 to expand the expansion piece 213, and the base metal 30 is scraped by the blade portion 2131 at the tip of the expansion piece 213. , The expanded expansion piece 213 is locked to the base material 30 (see FIG. 11D). The expanded piece 213 expanded here so that the ratio of the outer diameter D2'of the expanded piece 213 after the expansion to the outer diameter D1'of the expanded piece 213 before the expansion becomes 1.5 times or more. And locked (see FIG. 10).

After that, the rotation bolt 46 is pulled out from the sleeve 21, the special jig 47 and the rotation bolt 46 are removed, the bolt 23 is inserted into the sleeve 21, and the bolt 23 is screwed to the female screw 223 of the cone nut 22 (see FIG. 11 (e)). ). Then, the mounting plate 45 of the required structure to be attached by the post-construction anchor 2 is arranged so as to be inserted into the bolt 23 protruding from the base material 30 of the existing structure, and the washer 24 is attached to the bolt 23 from the outside of the mounting plate 45. The nut 25 is screwed onto the bolt 23 from the outside thereof, and the required structure is attached to the base material 30 of the existing structure (see FIG. 11 (f)).

According to the second embodiment, the corresponding effect can be obtained from the configuration corresponding to the first embodiment, and the base material 30 on which the post-installed anchor 2 is placed is shaved with the blade-shaped tip portion of the expansion piece 213. The expanded expansion piece 213 can be locked to the base material, eliminating the need for a separate work using a drill bit or the like for forming an enlarged diameter hole portion, and streamlining the construction work of the post-installed anchor 2. be able to. Further, since the expanded piece 213 in the expanded state in which the base material 30 is cut can be directly locked to the hole wall of the base material 30, the frictional force and the fixing strength between the expansion piece 213 and the hole wall can be increased. At the same time, the required fixing strength can be obtained even if the embedded length of the post-installed anchor 2 is made shallower. Further, since the bolt 23 can be removed and replaced while the cone nut 22 remains in the drilling, excellent maintainability can be exhibited.

Further, the position confirmation portion 215 makes it possible to easily confirm that the cone nut 22 is in contact with the bottom portion 35 of the drilling 34 and the expansion piece 213 can be appropriately expanded, and the efficiency of the construction work can be confirmed. , The accuracy can be further improved.

[Scope of inclusion of the invention disclosed in 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 action and 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.

Post-installed anchors of the present invention are not limited to the first and second embodiments described above, but include those within the scope of the purpose of the present invention, and slit until reaching a thin-walled hinge portion provided with an annular groove on the outer periphery. An expansion piece is provided near the tip of the bolt, which is cut and divided, and the tapered part is relatively inserted inside the expansion piece to allow the expansion piece to be expanded. Appropriate post-installed anchors are included in which the ratio of the outer diameter of the expanded piece to the outer diameter of the expanded piece is 1.5 times or more.

Further, the post-installed anchor 1 of the first embodiment can be constructed by a method other than the construction procedure described in the first embodiment, and the post-installed anchor 2 of the second embodiment is described in the second embodiment. It is also possible to construct by other than the construction procedure.

Further, the base material to which the construction anchor is placed after the present invention can be various materials such as asphalt, lightweight aerated concrete, brick, and concrete, but asphalt, lightweight aerated concrete (ALC), and brick. In the case of a fragile base material such as, an additional effect can be obtained. That is, in the post-installed anchor of the present invention, even when the base material is fragile such as asphalt, lightweight cellular concrete (ALC), and brick, the expansion piece can be greatly expanded and fixed, and the post-installed anchor is placed. Even when the thickness of the base metal is thin, post-installed anchors can be placed with a shallow embedding length and the required fixing strength. Further, it is possible to avoid fixing with a strength that is too strong for the base metal, and it is possible to limit the breaking range of the base metal to a local range when a destructive force of the post-installed anchor is applied. The fragile base material in the present invention is not limited to simply having a low compressive strength of the test specimen, but may be brittle as a structure or elastically deformed like asphalt. It also includes the appropriate fragile base material normally assumed in the civil engineering and construction industry. Further, a structure attached to the base material of the existing structure by using the post-installed anchor of the present invention is also appropriate.

FIG. 12 is an example in which the post-installed anchor 1 is placed on the road 61 of the bridge, and the wire rope type guard fence 63 is attached and installed as a structure via the attachment plate 62. As shown in FIG. 13, the road 61 of the bridge is configured by laminating a reinforced concrete floor plate 611, an adhesive layer 612, a waterproof layer 613, a base layer asphalt pavement 614, and a surface layer asphalt pavement 615 in order from the bottom, and is in an expanded state. Post-construction anchors 1 are placed on the base layer asphalt pavement 614 and the surface layer asphalt pavement 615 so as not to reach the waterproof layer 613. That is, the post-construction anchor 1 is placed on the base layer asphalt pavement 614 and the surface layer asphalt pavement 615 of the fragile base material, and the mounting plate 62 and the wire rope type guard fence 63 are installed.

In the structures of FIGS. 12 and 13, when a destructive force is applied to the post-construction anchor 1 due to an accident or the like, the base layer asphalt pavement 614 and the surface layer are not affected by the reinforced concrete floor plate 611, the adhesive layer 612, and the waterproof layer 613. The fracture range can be limited to the local range of the thick dotted line of the asphalt pavement 615 (see FIG. 13).

INDUSTRIAL APPLICABILITY The present invention can be used when installing post-installed anchors on various base materials such as asphalt, lightweight aerated concrete, brick, and concrete.

1 ... Post-construction anchor 11 ... Sleeve 111 ... Tapered part 112 ... Position confirmation part 113 ... Rear end surface 12 ... Expansion sleeve 121 ... Base 122 ... Expansion piece 123 ... Thin-walled hinge part 124 ... Circular groove 125 ... Slit 126 ... Inclined surface 13 ... Stepped nut 131 ... Small diameter part 132 ... Large diameter part 133 ... Female screw 14 ... Bolt 15 ... Washer 16 ... Nut 2 ... Post-construction anchor 21 ... Sleeve 211 ... Circular groove 212 ... Thin-walled hinge 213 ... Expansion piece 2131 ... Blade part 214 ... Slit 215 ... Position confirmation part 216 ... Female screw 22 ... Cone nut 221 ... Base 222 ... Tapered part 223 ... Female screw 23 ... Bolt 24 ... Washer 25 ... Nut 30 ... Base material 31 ... Drilling 32 ... Bottom 33 ... Diameter-expanded hole part 34 ... Drilling 35 ... Bottom 41 ... Drill bit for forming a straight hole 42 ... Cleaning tool 43 ... Driving tool 44 ... Hammer 45 ... Mounting plate 46 ... Rotating bolt 47 ... Dedicated jig 51 ... Drill bit for forming a diameter-expanded hole 52 ... Shank sleeve 521 ... Shank part 522 ... Sleeve part 523 ... Step surface 53 ... Intermediate sleeve 531 ... Female screw 532 ... Stroke guide 533 ... Guide screw 54 ... Compression coil spring 55 ... Sleeve joint 551 ... Male screw 552 ... Base 553 ... Male screw 56 ... Bottom expansion Sleeve 561 ... Female screw 562 ... Tip part 563 ... Fitting groove 564 ... Circumferential wall 565 ... Diameter-expanding blade entry / exit window 57 ... Bottom-expanding blade 571 ... Diameter-expanding blade 572 ... Twisting coil spring 573 ... Blade material 574 ... Inclined groove 58 ... Shaft 61 ... Bridge road 611 ... Reinforced concrete floorboard 612 ... Adhesive layer 613 ... Waterproof layer 614 ... Base layer asphalt pavement 615 ... Surface asphalt pavement 62 ... Mounting plate 63 ... Wire rope type protective fence D1, D1'... Outer diameter of expansion piece before expansion D2, D2'... Outer diameter of the expansion piece after expansion

Claims (2)

An expansion piece is provided near the tip of the bolt, which is divided by cutting a slit until it reaches the thin-walled hinge portion provided with an annular groove on the outer circumference.
A post-installed anchor that allows the expansion piece to be expanded by allowing the tapered portion to enter relatively inside the expansion piece.
The expansion piece is provided at the annular base of the expansion sleeve via the thin hinge portion.
A stepped nut having a small diameter portion and a large diameter portion having a larger diameter than the small diameter portion is screwed into the tip portion of the bolt with the large diameter portion on the tip side.
The expansion sleeve is extrapolated to the small diameter portion of the stepped nut and the base is abutted against the large diameter portion.
A sleeve having the tapered portion formed at the tip portion is extrapolated to the bolt and is provided in contact with the expansion piece of the expansion sleeve.
Post-installed anchors characterized in that the ratio of the outer diameter of the expanded piece after expansion to the outer diameter of the expanded piece before expansion is 1.5 times or more. It is a method of constructing an anchor after the description of claim 1 .
The first step of forming a perforation having an enlarged diameter hole near the bottom in the base material of the existing structure, and
The second step of inserting the post-installed anchor in the non-expanded state from the stepped nut side into the perforation,
A third step of driving the sleeve, inserting the tapered portion of the sleeve into the inside of the expansion piece to expand the expansion piece, and locking the expanded expansion piece to the diameter-expanded hole portion. Post-installed anchor construction method characterized by being prepared.

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