JPWO2016092675A1 - Post-construction anchor, post-construction anchor construction method and post-construction anchor system - Google Patents

Abstract

Provided is a post-construction anchor or the like that can reliably and appropriately bite the expanded portion into the expanded diameter portion of the anchor hole. An internal cone driving type post-installed anchor 10 anchored to an anchor hole 1 having an enlarged diameter portion 4 formed at a predetermined depth position of the pilot hole portion 3, and a cylindrical tube inserted into the anchor hole 1 A cylindrical body 11, an expanded portion 12 that is connected to the distal end side of the cylindrical main body 11 and formed integrally with the cylindrical main body 11, a cone portion 13 that expands the expanded portion 12 from the inside, and an expanded portion 12 It is provided at the tip, and allows the expansion portion 12 to expand, and restricts the distance from the bottom 3c of the lower hole portion 3 of the expansion portion 12 so that the expansion portion 12 faces the diameter expansion portion 4. And a position restricting portion 14 to be operated.

Description

  The present invention relates to a post-construction anchor that is anchored in an anchor hole drilled in a frame such as concrete, a post-construction anchor construction method, and a post-construction anchor system.

Conventionally, as this type of post-installed anchor, an anchor bolt that is driven into a hole (anchor hole) in which a diameter-enlarged portion is cut in the inner depth is known (see Patent Document 1).
The anchor bolt includes a bolt body having a protruding jaw continuously provided at a tip portion, and a pressing cylinder having a deployment sleeve continuously provided at the tip portion and having the bolt body fitted therein. The deployment sleeve is configured by assembling a plurality of deployment pieces separated in a vertically split shape into a cylindrical shape and binding the plurality of deployment pieces with a binding strip such as a spring. Further, the overhanging jaw connected to the body of the bolt has a tapered surface that expands the expansion sleeve so as to push open.
When the anchor bolt is inserted into the hole (anchor hole) and the pressing cylinder is driven from the outside, the deployment sleeve advances through the pressing cylinder. The advancing deployment sleeve is pushed open to rest on the tapered surface of the overhanging jaw. As a result, the developing sleeve is accommodated in the enlarged diameter portion, and the bolt body is fixed to the hole via the enlarged diameter portion.

Japanese Patent No. 2544021

By the way, in the post-construction anchor, it is theoretically said that the expanded portion (expanded portion) expands in the pilot hole by driving and high pulling strength is obtained by the wedge effect. However, in actual construction, even if the strength of the concrete is superior and the expanded portion is pressed against the lower hole, the concrete does not bite into the concrete and expand. Therefore, in order to obtain the theoretical wedge effect, it is necessary to form some diameter-expanded portion in the pilot hole and to bite the expanded portion into this.
Since the conventional anchor bolt is a so-called main body driving type post-installed anchor, when the pressing cylinder is driven into the body of the bolt, the expansion sleeve is placed on the tapered surface and expanded (expanded). For this reason, there has been a problem that the deployment sleeve cannot be driven into the expanded diameter portion unless the movement locus of the expanded sleeve that expands while moving forward and the position and shape of the expanded diameter portion are accurately matched. .
However, in the post-installed anchor with the inner cone driving type, the expanded portion is expanded without advancing by the driven cone, and thus the high accuracy as described above is not required. However, in this case, since the tip of the post-installed anchor (anchor body) is abutted against the bottom of the anchor hole, the position of the expanded portion does not match the position of the expanded portion, or the expanded portion There is a problem that the tip is difficult to open due to the shape of the hole bottom. That is, the hole bottom of the anchor hole has a conical shape, and the tip of the expanded portion to be driven receives a component force (reaction force) directed obliquely inward from the hole bottom. For this reason, even if the expanded diameter portion can be formed in contact with the bottom of the hole, the expansion of the expanded portion is suppressed (the cone cannot be driven), and the expanded portion becomes difficult to bite into the expanded diameter portion. (Construction failure).

  An object of the present invention is to provide a post-construction anchor, a post-construction anchor construction method, and a post-construction anchor system that can reliably and appropriately bite an expanded portion into an enlarged diameter portion of an anchor hole.

  The post-installed anchor of the present invention is an internal cone driving type post-installed anchor that is anchored to an anchor hole having an enlarged diameter portion formed at a predetermined depth position of the pilot hole, and is a cylindrical shape that is inserted into the anchor hole The cylindrical main body, the widened portion connected to the distal end of the tubular main body, the cone portion that widens the widened portion from the inside, and the wide end of the widened portion are allowed to expand. And a position restricting portion that restricts the distance from the bottom of the pilot hole of the expanded portion so that the expanded portion faces the expanded portion.

  According to this configuration, when the post-construction anchor is inserted into the prepared hole, the position restricting portion comes into contact with the bottom of the prepared hole, and the expanded portion faces the expanded diameter portion. When the cone portion is driven in this state, the expanded portion expands without moving forward and is pressed against the inner peripheral surface of the expanded diameter portion. That is, if the distance from the hole bottom of the enlarged diameter portion is determined in advance, the position restricting portion can cause the enlarged portion to confront the enlarged diameter portion with precision and can be expanded. Therefore, even if it is a post-installed anchor in which the cone part is driven in response to the bottom of the hole (internal cone driving type), the expanded part should be reliably and appropriately expanded (engaged) at the position of the enlarged diameter part. Can do. This also means that the cone portion is driven smoothly and reliably, and it is possible to prevent poor construction. Thereby, the drawing strength (including the drawing strength over time) of the construction anchor can be remarkably increased. In addition, it is preferable that the cylindrical main body and the expansion part are integrally formed.

  In this case, it is preferable that the position restricting portion restricts the distance from the bottom of the lower hole of the expanded portion so that the distal end portion of the expanded portion is accommodated in the expanded diameter portion in the axial direction.

  According to this configuration, even if a manufacturing error or construction error occurs at the position of the enlarged diameter part or the enlarged part, the tip of the enlarged part is reliably and appropriately expanded at the position of the enlarged diameter part. Can be made.

  Moreover, it is preferable that the front-end | tip part of a position control part is formed in the spire shape.

  According to this configuration, the tip of the position restricting portion can be brought into contact with the center of the bottom of the anchor hole, and the position restricting portion can be accurately positioned with respect to the hole bottom. Thereby, in the axial direction, the expanded portion can be opposed to the expanded diameter portion with high accuracy, and the expanded portion can be expanded in this state.

  Furthermore, it is preferable that the base end portion of the position restricting portion includes a mounting portion attached to the distal end portion of the expanding portion and an abutting portion with which the distal end of the expanding portion contacts.

  In this case, the mounting portion has a fitting convex portion that fits to the inner peripheral surface of the distal end portion of the expanding portion, and the abutting portion includes an annular abutting portion disposed outside the fitting convex portion. It is preferable to have.

  According to these configurations, the position restricting portion can be attached to the tip of the expanding portion via the attaching portion. In addition, the contact portion allows the reaction force applied from the bottom of the anchor hole to be transmitted to the expanded portion while allowing the expanded portion to expand, and the expanded portion can be smoothly expanded. it can. The position restricting portion may be attached to the expanding portion by bonding at the mounting portion, or may be fitted and attached so as to slightly expand the expanding portion.

  Moreover, it is preferable that a position control part has a cone receiving part which receives the front-end | tip part of the cone part which was driven in.

  According to this configuration, the cone receiving portion does not hinder proper driving of the cone portion by the position restricting portion. Thereby, the driving | running stroke of a cone part can be lengthened.

  On the other hand, it is preferable that an expansion part has a some annular groove formed in the outer peripheral surface.

  According to this structure, when driving, the expanded portion is preferentially deformed at the portions of the plurality of annular grooves. For this reason, an expansion part can be changed so that the shape of a diameter expansion part may be followed, and an expansion part can be made to bite into a diameter expansion part reliably.

  The post-construction anchor construction method of the present invention is the above-described post-construction anchor construction method, comprising a drilling step of drilling a pilot hole, a diameter expansion step of forming a diameter-expanded portion in the pilot hole, and a post-construction anchor. An insertion step of inserting into the anchor hole and an anchoring step of driving the cone portion and expanding the expanded portion are provided.

  According to this configuration, when the post-installed anchor is inserted into the anchor hole, when the cone portion is driven, the position restricting portion that is in contact with the bottom of the hole serves as a receiver, and only the cone portion advances. On the other hand, the expanded portion is opposed to the expanded diameter portion by the position restricting portion, and the expanded portion smoothly expands toward the expanded diameter portion by the advance of the cone portion. Thereby, an expansion part expands and it press-contacts to the internal peripheral surface of an enlarged diameter part. Therefore, the widened portion is locked in a secured state with respect to the enlarged diameter portion, and the post-construction anchor can be firmly fixed (fixed) to the anchor hole.

  In this case, it is preferable to further include an injection step of injecting an adhesive into the anchor hole between the diameter expansion step and the insertion step.

  According to this structure, the post-installed anchor can be fixed not only mechanically to the anchor hole but also by an adhesive. Therefore, the post-construction anchor can be firmly fixed (fixed) by the anchor hole.

  The post-construction anchor system of the present invention includes the post-construction anchor described above and a diameter-expanding drill bit having a cutting edge portion that grinds the diameter-expanded portion in the pilot hole at the tip portion, and in the axial direction, position restriction The distance between the tip of the diameter expanding drill bit and the tip of the cutting edge is longer than the distance between the tip of the part and the tip of the expanding part.

  According to this configuration, the diameter-expanded portion is formed in the pilot hole by the diameter-expanding drill bit that abuts against the bottom of the pilot hole, and the post-installation that is anchored to the anchor hole and the anchor hole The expanded portion of the anchor can be opposed to a desired positional relationship. For this reason, as for the post-construction anchor anchored to the anchor hole, the expanded portion is anchored (pressure contacted) to the expanded diameter portion, and is in a state of being retained (wedge effect) with respect to the expanded diameter portion. For this reason, even if loosening occurs due to vibration or the like, it does not fall out. Therefore, the post-construction anchor can be firmly fixed (fixed) to the anchor hole.

  In this case, it is preferable that the distal end portion of the diameter expanding drill bit is formed in a spire shape, and the distal end portion of the post-construction anchor is formed in a spire shape.

  According to this configuration, the diameter-expanding drill bit and the post-installed anchor come into contact with the bottom of the anchor hole at one point of each tip. For this reason, even if the shape of the hole bottom is uneven, that is, regardless of the type of bit for drilling the pilot hole, the tip of the drill bit for diameter expansion and the tip of the post-installed anchor are in contact with the same point on the hole bottom. It can be (abutted). Therefore, the diameter-enlarged portion formed by the diameter-expanding drill bit and the expanded portion of the post-installed anchor inserted into the anchor hole can be accurately opposed in the axial direction.

It is sectional drawing of the anchor hole into which a post-construction anchor is driven. It is the half part sectional view (a) before driving in of the post-construction anchor concerning an embodiment, and the AA line sectional view (b). It is the half part sectional view (a) after driving in the post-construction anchor concerning an embodiment, and the BB line sectional view (b). It is a disassembled perspective view of the post-construction anchor which concerns on embodiment. It is a structural diagram of a position control part. It is a structural diagram of a position restricting portion according to a modified example. It is sectional drawing showing the construction procedure (a), (b), (c) of the post-construction anchor which concerns on embodiment. It is sectional drawing showing the construction procedure (d) and (e) of the post-construction anchor which concerns on embodiment. It is a top view of the drill bit for diameter expansion in a diameter expansion apparatus.

  Hereinafter, a post-construction anchor, a post-construction anchor construction method, and a post-construction anchor system according to an embodiment of the present invention will be described with reference to the accompanying drawings. This post-construction anchor is a so-called metal expansion anchor provided to support a structural body with respect to a fixing body such as a concrete frame or foundation. In particular, the post-installed anchor of the present embodiment can be firmly fixed to the fixing body in cooperation with the anchor hole having a special shape. Further, the post-construction anchor system is a system of post-construction anchors and a diameter-expanding drill bit for forming this special-shaped anchor hole. Therefore, prior to the description of the post-installed anchor, this special-shaped anchor hole will be briefly described.

  FIG. 1 shows an anchor hole formed in a concrete fixing body. As shown in the figure, the anchor hole 1 includes a straight-shaped pilot hole 3 (preparation hole) drilled in a fixing body 2 (for example, a concrete frame or a concrete foundation) and a deep part (tip portion) of the pilot hole 3. ) And an enlarged diameter portion 4 formed to have a diameter larger than that of the prepared hole portion 3. The enlarged diameter portion 4 is composed of a cylindrical portion projecting outward from the pilot hole portion 3 with two annular stepped portions 5. Moreover, the pilot hole part 3 has the long opening side hole part 3b by the side of the opening part 3a on both sides of the enlarged diameter part 4, and the short bottom side hole part 3d by the side of the hole bottom 3c.

  In this case, the pilot hole 3 is drilled by a drilling device 61 such as a vibration drill, a hammer drill, or a core drill described later (the illustrated one is drilled with a vibration drill). Therefore, the hole bottom 3c of the prepared hole 3 is formed in a conical shape. The enlarged diameter portion 4 is formed by an enlarged diameter device 62 having an enlarged diameter drill bit 72 described later. In addition, the enlarged diameter part 4 does not necessarily need to be cylindrical, for example, may be a tapered cylindrical shape.

  2 and 3 are a half sectional view (a) and a transverse sectional view (b) of the post-construction anchor according to the embodiment, and FIG. 4 is an exploded perspective view of the post-construction anchor. As shown in these drawings, the post-installed anchor 10 is a so-called internal cone driving type anchor, and has a cylindrical cylindrical main body 11 inserted into the anchor hole 1 and an expansion that continues to the tip of the cylindrical main body 11. A portion 12, a cone portion 13 that expands the expanding portion 12 from the inside, and a position restricting portion 14 that is attached to the distal end portion of the expanding portion 12.

  The cylindrical main body 11 and the expanding part 12 are integrally formed of steel, stainless steel or the like. The cone portion 13 is also formed of steel or stainless steel. Moreover, the position control part 14 is formed separately with respect to the expansion part 12, and this is also formed with steel, stainless steel, etc.

  The cylindrical main body 11 is a part that forms the main body of the post-installed anchor 10, and is formed in a cylindrical shape slightly smaller in diameter than the anchor hole 1. An internal thread portion 16 is formed on the inner peripheral surface of the cylindrical main body 11. Although not shown, a connecting bolt (generally, a full screw bolt) such as a suspension bolt or a connecting bolt for a support object is screwed into the female screw portion 16. The diameter of the female thread portion 16 or the diameter of the connecting bolt is the nominal diameter of the post-installed anchor 10. In addition, in order to prevent the anchoring of the post-installed anchor 10 after being anchored, fitting that fits into the opening 3a of the anchor hole 1 on the outer peripheral surface of the base end portion of the cylindrical main body 11 A part may be provided (not shown).

  The expanded portion 12 is a portion corresponding to the expanded diameter portion 4 of the anchor hole 1 and is integrally formed with the same diameter as the cylindrical main body 11. A plurality of annular grooves 21 are formed on the outer peripheral surface of the expanded portion 12 with gaps in the axial direction. The portion where each annular groove 21 is formed is formed thin, and is deformed preferentially as compared with other portions when driven. Each annular groove 21 has a semicircular cross section so that stress concentration does not occur during deformation.

  The expanded portion 12 is formed with a plurality of slits 22 cut from the tip. In this embodiment, six slits 22 equally arranged in the circumferential direction are provided (see FIG. 2B), and each slit 22 extends from the tip of the expanding portion 12 to a position reaching the cylindrical main body 11. It extends in the axial direction. Needless to say, the six slits 22 promote the expansion of the expanded portion 12 by driving the cone portion 13. The number of slits 22 is preferably four or more (both are equally arranged in the circumferential direction).

  A tapered tapered cone guide portion 23 is formed on the inner peripheral surface of the expanding portion 12 so as to be continuous with the female screw portion 16, and the cone portion 13 is held by the cone guide portion 23 (FIG. 2 ( a)) and the cone 13 is driven along the cone guide 23 (see FIG. 3A). In this case, the taper of the cone guide portion 23 and the taper of the cone portion 13 are formed at the same angle (taper angle).

  A fitting recess 24 is formed at the distal end of the expanding portion 12 so as to be continuous with the cone guide portion 23. The fitting recess 24 is an annular groove formed on the inner peripheral surface of the distal end portion of the expanding portion 12. A fitting convex portion 43 of the position restricting portion 14 described later is fitted into the fitting concave portion 24 and abuts in the axial direction. As a result, the position restricting portion 14 is attached to the expanding portion 12.

  Further, the expanded portion 12 is provided at a position facing the expanded diameter portion 4 when the post-construction anchor 10 is inserted into the anchor hole 1 (when reaching the hole bottom 3c). In this case, the post-installed anchor 10 inserted into the anchor hole 1 is abutted against the hole bottom 3c of the anchor hole 1, and is positioned in the axial direction with reference to the hole bottom 3c. For this reason, the expansion part 12 is positioned by the diameter expansion part 4 in an axial direction by the position control part 14 with which the front-end | tip part was mounted | worn.

  More specifically, the distal end of the expanded portion 12 is accommodated in the expanded diameter portion 4, that is, the distal end of the expanded portion 12 is somewhat proximal to the annular stepped portion 5 on the distal end side of the expanded diameter portion 4. (1 mm to 2 mm). As a result, at least the distal end portion of the expanded portion 12 is reliably expanded within the expanded diameter portion 4. On the other hand, the position of the enlarged diameter portion 4 from the hole bottom 3c is defined in relation to an enlarged diameter device 62 described later (see FIG. 7B). For this reason, the axial length of the position restricting portion 14 is designed in relation to the diameter expanding device 62 (details will be described later).

  The cone portion 13 is integrally formed with a tapered portion 31 on the distal end side and a straight portion 32 on the proximal end side. When the straight portion 32 is driven in from the outside, the tapered portion 31 advances in the cone guide portion 23 of the expanding portion 12. Thereby, the expansion part 12 expands outward so that each part divided | segmented by the slit 22 is pushed open by the cone part 13. FIG. Further, the driving (advancing) of the cone portion 13 is regulated by the expanded portion 12 being pressed against the inner peripheral surface of the enlarged diameter portion 4, and the completion of the driving is felt by a driving sound or the like. And the expansion part 12 deform | transforms into the shape which followed the internal peripheral surface of the enlarged diameter part 4 by driving | throwing-in of the cone part 13 (refer Fig.3 (a)).

  As shown in FIGS. 2 and 5, the position restricting portion 14 is provided at the distal end portion of the expanding portion 12, and the pilot hole portion of the expanding portion 12 so that the expanding portion 12 faces the enlarged diameter portion 4. The distance from the 3 hole bottom 3c is regulated. The position restricting portion 14 includes a body portion 41 having the same diameter as the expanded portion 12, a spire portion 42 extending from the body portion 41 toward the distal end side, and a fitting convex portion 43 (mounting portion) extending from the body portion 41 toward the proximal end side. And an annular abutting portion 44 (abutting portion) that is disposed outside the fitting convex portion 43 and constitutes an end surface of the trunk portion 41 on the proximal end side. Further, the position restricting portion 14 has a cone receiving portion 45 for receiving the tip portion of the driven cone portion 13.

  The spire portion 42 is formed in a spire shape, that is, a conical shape. The cone angle of the spire portion 42 is formed to be somewhat smaller than the cone angle of the hole bottom 3c of the anchor hole 1, and the tip of the spire portion 42 is in contact with the center of the hole bottom 3c. As described above, the expanded portion 12 is positioned by the position restricting portion 14, but the spire portion 42 of the position restricting portion 14 is abutted against the center (point contact) of the hole bottom 3c serving as a positioning reference. The expanded portion 12 is positioned with relatively high accuracy in the axial direction. The cone angle of the spire portion 42 and the cone angle of the hole bottom 3c may be the same.

  The fitting convex portion 43 is formed in an annular shape, and is fitted and attached to the fitting concave portion 24 of the expanding portion 12. In this case, it is preferable to adhere (weakly bond) the fitting convex portion 43 to the fitting concave portion 24 with an adhesive or the like so that the position restricting portion 14 does not easily fall off from the widened portion 12. Alternatively, the fitting convex portion 43 is fitted and attached to the fitting concave portion 24 so as to slightly expand the expanding portion 12. Note that the position restricting portion 14 may be attached to the expanded portion 12 by using the fitting concave portion 24 as a female screw and the fitting convex portion 43 as a male screw. In such a case, the position of the expanded portion 12 from the hole bottom 3c can be finely adjusted.

  The annular contact portion 44 is a portion located outside the fitting convex portion 43, and the tip of the expansion portion 12 contacts. Further, when the cone portion 13 is driven, the annular contact portion 44 transmits a reaction force from the hole bottom 3 c to the expansion portion 12 and permits expansion (movement) to the outside of the expansion portion 12. In addition, although the cyclic | annular contact part 44 of embodiment is formed flat (orthogonal to an axial direction) as an end surface of the trunk | drum 41, it is good also as a slightly outwardly inclined surface. Thereby, the expansion to the outer side of the expansion part 12 is performed smoothly.

  The cone receiving portion 45 is a groove portion facing the tip of the cone portion 13 that has been driven in, and is recessed in the center of the position restricting portion 14 across the fitting convex portion 43, the trunk portion 41 and the spire portion 42. Has been. In this way, by forming the cone receiving portion 45 in the position restricting portion 14, interference of the deeply driven cone portion 13 with the position restricting portion 14 can be prevented, and the weight of the position restricting portion 14 can be reduced. .

  FIG. 6 shows a modification of the position restricting unit 14. As shown in the figure, the position restricting portion 14 according to the modification has six radial convex portions 51 instead of the fitting convex portion 43 as the mounting portion. Further, six radial contact portions 52 that are the contact portions are formed on the end surface of the body portion 41 excluding the six radial convex portions 51. The six radial protrusions 51 are formed in the expanded portion 12 and are fitted and attached to the six slits 22, and the six radial contact portions 52 are in contact with the tip of the expanded portion 12. In addition, the radial convex part 51 does not necessarily need to be the same number as the number of the slits 22, and what is necessary is just to be plural, such as every other (point symmetry).

  Next, with reference to FIG. 7 and FIG. 8, the construction method (construction procedure) of the post-construction anchor 10 will be described. In this construction method, a drilling step (FIG. 7A) for drilling the prepared hole portion 3 using the drilling device 61 and an enlarged diameter portion for forming the expanded diameter portion 4 in the prepared hole portion 3 using the expanded diameter device 62. Step (FIG. 7 (b)), injection step (FIG. 7 (c)) for injecting adhesive A into anchor hole 1 using injection device 63, and insertion for inserting post-installed anchor 10 into anchor hole 1 A step (FIG. 8D), and an anchoring step (FIG. 8E) for expanding the expanded portion 12 of the post-installed anchor 10 after insertion.

  The drilling device 61 is constituted by a vibration drill or a hammer drill equipped with a concrete drill bit 71. The pilot hole 3 drilled by the concrete drill bit 71 has a conical shape at the bottom 3c.

The diameter expanding device 62 is configured by mounting a diameter expanding drill bit 72 on an electric drill (not shown).
As shown in FIG. 9, the diameter expansion drill bit 72 includes, for example, a pair of cutting blade portions 73, a cutting blade holding portion 74 that holds the pair of cutting blade portions 73 movably in the radial direction, and a cutting blade holding portion. And a shank portion 75 that supports 74. In this diameter-expanding drill bit 72, the pair of cutting edge portions 73 are expanded (moved) radially outward by a centrifugal force accompanying rotation, and the expanded-diameter portion 4 is ground (see FIG. 7B). ). The cutting edge portion 73 is preferably a diamond cutting edge or a super steel alloy cutting edge.

  On the other hand, a spire-shaped conical protrusion 74 a is formed at the tip of the cutting edge holding portion 74, and the diameter-expanded portion 4 is formed by abutting the conical protrusion 74 a against the hole bottom 3 c of the lower hole portion 3. To do. Thereby, the rotation blur of the drill bit 72 for diameter expansion is suppressed. Further, the conical protrusion 74 a is formed at the same cone angle as the above-mentioned spire portion 42. Accordingly, the conical protrusion 74a is also abutted against the center of the hole bottom 3c in the same manner as the spire 42 abutted against the center of the hole bottom 3c. That is, in the diameter-expanding drill bit 72 that abuts against the hole bottom 3c, the diameter-expanded portion 4 is formed with reference to the hole bottom 3c, and the post-installed anchor 10 that abuts against the hole bottom 3c expands with respect to the hole bottom 3c. The part 12 faces the enlarged diameter part 4.

  The diameter-expanding drill bit 72 and the post-construction anchor 10 of this embodiment constitute a post-construction anchor system. Specifically, in the axial direction, the tip of the diameter-expanding drill bit 72 (conical protrusion 74a) with respect to the distance between the tip of the position restricting portion 14 (tip of the spire portion 42) and the tip of the expanding portion 12. ) And the tip of the cutting edge portion 73 are long (1 to 2 mm in the embodiment). Thus, when the diameter-expanded portion 4 is formed so that the diameter-expanding drill bit 72 abuts against the hole bottom 3 c, the tip of the expanded portion 12 inserted into the anchor hole 1 is located on the tip side of the diameter-expanded portion 4 It will be located somewhat on the base end side (1 mm to 2 mm) from the annular stepped portion 5. In this state, the cone portion 13 is driven.

  The injection device 63 includes a pump part (not shown) and a nozzle part 77, and adhesive A stored in the pump part is discharged from the tip of the nozzle part 77 and injected into the anchor hole 1 by pumping of the pump part. (See FIG. 7C).

  In the drilling step of FIG. 7A, the concrete drill bit 71 of the vibration drill is rotated to drill the prepared hole portion 3 having a depth corresponding to the nominal diameter of the post-installed anchor 10. In this case, the concrete drill bit 71 is used in which the diameter (diameter) of the prepared hole portion 3 is about 0.5 mm larger than the diameter (outer diameter) of the post-construction anchor 10. In addition, it is preferable to perform this perforation operation | work and the suction operation (cleaning) which attracts | sucks the grinding powder of concrete simultaneously in parallel.

  In the diameter expansion process of FIG. 7B, the diameter expansion drill bit 72 is inserted into the prepared hole 3 so as to abut against the hole bottom 3c, and the diameter expansion drill bit 72 is rotated by an electric drill (10 Second), the enlarged diameter portion 4 is ground. Thereby, the enlarged diameter part 4 is formed in the predetermined position from the hole bottom 3c. In this case as well, it is preferable to simultaneously perform the drilling operation and the suction operation (cleaning) for sucking the concrete grinding powder. Moreover, you may make it supply a cooling fluid to a pair of cutting-blade part 73 via the shank part 75 (axial core part). In this case, cooling of the cutting edge portion 73 and cleaning of the anchor hole 1 are performed simultaneously.

  7C, the nozzle portion 77 is inserted into the anchor hole 1 so as to abut against the hole bottom 3c, and the adhesive A is injected from the innermost portion of the anchor hole 1. In this case, as the adhesive A, for example, an epoxy resin adhesive A is used. Moreover, the injection amount of the adhesive A is an amount obtained by subtracting the volume of the post-construction anchor 10 from the volume of the anchor hole 1 (including the enlarged diameter portion 4). Thereby, it is possible to prevent the adhesive A from protruding from the anchor hole 1 when the post-construction anchor 10 is inserted into the anchor hole 1.

  In the insertion step of FIG. 8D, the post-installed anchor 10 with the position restricting portion 14 is inserted into the anchor hole 1 so as to abut against the hole bottom 3c. By this insertion, the expanded portion 12 of the post-installed anchor 10 is in a state of facing the expanded diameter portion 4 of the anchor hole 1.

  In the anchoring step of FIG. 8 (e), the driving rod 78 is inserted into the cylindrical main body 11 so as to contact the cone portion 13, and the cone portion 13 is driven through the driving rod 78 with a hammer 79 or the like. As a result, the cone portion 13 is strongly pushed into the expanded portion 12, and the expanded portion 12 expands following the shape around the expanded diameter portion 4. Thereby, the expansion part 12 is press-contacted to a part of enlarged diameter part 4 and the opening side hole part 3b. The cone portion 13 can also be driven (advanced) by a male screw (bolt or the like) screwed into the female screw portion 16 of the cylindrical main body 11.

  As described above, according to this embodiment, the position restricting portion 14 merely inserts the post-installed anchor 10 into the prepared hole portion 3, and the distal end portion of the expanded portion 12 is made annular at the distal end side of the enlarged diameter portion 4. It can face the step part 5 vicinity. In this state, by driving the cone portion 13, the expanded portion 12 can be reliably bited into the expanded diameter portion 4 (with high accuracy). Accordingly, the theoretical wedge effect can be surely exerted on the anchor 10 after anchoring.

  Further, since the expanded portion 12 is expanded into the expanded diameter portion 4, the cone portion 13 can be driven smoothly, and the expanded expanded portion 12 is in pressure contact with the expanded diameter portion 4. You can feel the completion clearly. Therefore, it is possible to effectively prevent the poor placement of the cone portion 13, that is, the poor construction of the post-construction anchor 10.

  In addition, since the hole bottom 3c of the pilot hole part 3 in the embodiment is drilled with a concrete drill bit, it has a conical shape. However, when drilled with a core bit, a part of the concrete core has a hole bottom 3c. The remaining shape is not constant. However, the diameter-expanding portion 4 is formed by the diameter-expanding drill bit 72 having a spire-shaped (conical protrusion 74a) at the tip, and the expanding portion is formed by the position restricting portion 14 having a spire-shaped (spiral portion 42). Since the position of 12 is regulated, the expanded portion 12 can be opposed to the expanded diameter portion 4 even with the pilot hole portion 3 drilled with the core bit.

  DESCRIPTION OF SYMBOLS 1 Anchor hole, 2 fixing body, 3 pilot hole part, 3a opening part, 3c hole bottom, 4 diameter expansion part, 10 post-construction anchor, 11 cylindrical main body, 12 expansion part, 13 cone part, 14 position control part, 21 annular groove, 22 slit, 24 fitting concave part, 42 spire part, 43 fitting convex part, 44 annular contact part, 45 cone receiving part, 51 radial convex part, 52 radial contact part, 61 punching device, 62 expansion Diameter device, 63 Injection device, 72 Diameter expansion drill bit, 73 Cutting edge part, 74 Cutting edge holding part, 74a Conical protrusion, A Adhesive

Claims (11)

An internal cone driving type post-installed anchor anchored in an anchor hole in which an enlarged diameter portion is formed at a predetermined depth position of the pilot hole,
A cylindrical tubular body inserted into the anchor hole;
An expanded portion connected to the distal end side of the cylindrical body;
A cone portion for expanding the expansion portion from the inside;
Provided at the distal end of the expanded portion, allows the expanded portion to expand, and extends from the bottom of the lower hole of the expanded portion so that the expanded portion faces the expanded diameter portion. A post-construction anchor comprising a position restricting portion for restricting a distance.   The position restricting portion restricts a distance from a bottom of the lower hole of the expanding portion so that a tip portion of the expanding portion is accommodated in the enlarged diameter portion in an axial direction. The post-construction anchor described in 1.   The post-construction anchor according to claim 1 or 2, wherein a tip portion of the position restricting portion is formed in a spire shape. The base end portion of the position restricting portion includes an attachment portion attached to a distal end portion of the expanding portion,
The post-construction anchor according to claim 1, further comprising: an abutting portion with which a tip of the expanding portion abuts. The mounting portion has a fitting convex portion that fits to the inner peripheral surface of the distal end portion of the expanding portion,
The post-construction anchor according to claim 4, wherein the abutting portion includes an annular abutting portion disposed outside the fitting convex portion.   The post-construction anchor according to any one of claims 1 to 5, wherein the position restricting portion includes a cone receiving portion that receives a tip portion of the cone portion that has been driven.   The post-installed anchor according to any one of claims 1 to 6, wherein the expanding portion has a plurality of annular grooves formed with gaps in the axial direction. A construction method of a post-construction anchor according to any one of claims 1 to 7,
A drilling step of drilling the pilot hole;
A diameter expansion step of forming a diameter expansion portion in the pilot hole;
An insertion step of inserting the post-construction anchor into the anchor hole;
An anchoring step of driving in the cone portion and expanding the expanded portion, and a post-construction anchor construction method.   The post-construction anchor construction method according to claim 8, further comprising an injection step of injecting an adhesive into the anchor hole between the diameter expansion step and the insertion step. A post-construction anchor according to any one of claims 1 to 7,
At the tip, the drill hole for diameter expansion having a cutting edge portion for grinding the diameter-expanded portion in the pilot hole,
In the axial direction, the distance between the tip of the diameter expanding drill bit and the tip of the cutting edge is longer than the distance between the tip of the position restricting portion and the tip of the expanding portion. Post-construction anchor system. The tip of the drill bit for diameter expansion is formed in a spire shape,
The post-construction anchor system according to claim 10, wherein a tip portion of the post-construction anchor is formed in a spire shape.

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