JP4150414B1 - Anchor bolt and method for manufacturing anchor bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To install a pilot hole in a desired depth and perform stable construction, and it can be temporarily fixed without being driven with a driving tool. The present invention provides an anchor bolt that is easy to process, easy to process, low cost, and has good pullout strength and shear strength, and a method for manufacturing the anchor bolt.
A main body portion 22 having a male screw 21 formed at one end thereof, a reduced diameter portion 23 having a diameter smaller than an outer diameter of the main body portion 22, and a tapered shape extending from the reduced diameter portion 23 toward a tip. A bolt main body 2A having a tapered portion 24 having a diameter, and an expanding wedge 3A that is fitted to the reduced diameter portion 23 of the bolt main body 2A and slides toward the tip side along the tapered portion 24. 1A, the expanded wedge 3A has an expanded piece 31 that is formed in a diameter substantially the same as the outer diameter of the main body 22 in a state where the expanded wedge 3A is fitted to the reduced diameter portion 23. A biasing member 5 that biases the piece 31 in the direction of the tapered portion 24 is provided.
[Selection] Figure 1

Description

  The present invention relates to an anchor bolt attached to a structure such as concrete, and more particularly to an anchor bolt excellent in workability and economy and a method for manufacturing the anchor bolt.

  Conventionally, a technique related to an anchor bolt that is inserted into a pilot hole drilled in concrete or the like and fixed by being expanded has been proposed. For example, Japanese Patent Laid-Open No. 2003-27599 has a driving pin having a spiral protrusion at the tip and an anchor main body formed with a pin hole. The driving leg is widened by driving the driving pin into the pin hole. A pin-in type expansion anchor that is opened and fixed in a pilot hole has been proposed (Patent Document 1).

  As an anchor that does not use a driving pin, a wedge-type anchor as shown in FIG. 39A is also known. This wedge-type anchor is composed of an anchor body having a male thread at the base end and a taper at the tip, and a wedge member fitted near the base end of the taper. Then, after the anchor body is driven into the pilot hole with a hammer or the like and the nut is tightened to the male screw, the wedge member is locked and the taper part is moved to expand so that the wedge effect on the pilot hole is exhibited. It has become.

Japanese Patent Laid-Open No. 2003-27599

  However, in the conventional driving type anchor bolt including the invention described in Patent Document 1, it cannot be expanded unless the driving pin is driven. For this reason, it is necessary to prepare a driving tool separately, and there is a problem that a structure such as concrete is damaged by an impact at the time of driving and the surroundings are disturbed by noise. Further, since it is necessary to use a hard material for the driving pin to withstand impact, there is a problem that the manufacturing cost is high. Furthermore, the driving resistance requires more labor as the bolt diameter increases, and depending on the installer, it is often completed in a halfway driving state, resulting in insufficient pullout strength.

  Moreover, in the conventional drive-in type anchor bolt, when installing upward, it requires about five times as much labor as compared with the case where it constructs downward or sideways. Furthermore, since it does not expand unless the driving pin is driven, it cannot be locked in the prepared hole. For this reason, when the pilot hole is opened downward, it has to be pressed by hand so that the anchor bolt does not fall off, and there is a problem that it is difficult to expand at a desired depth.

  On the other hand, since the wedge-type anchor bolt has a structure in which the wedge member is locked to the pilot hole to prevent co-rotation, the outer diameter of the wedge member is smaller than the pilot hole diameter as shown in FIG. Is also formed quite large. For this reason, if it is not driven with a hammer or the like, it cannot be inserted into the pilot hole, and the same problem as in the case of the driving type occurs. Moreover, since the wedge member scrapes off the inner peripheral wall of the pilot hole when inserted, there is a problem that the wedge effect is reduced and the pullout strength and shear strength are reduced.

  Further, the length of anchor bolts embedded in concrete is generally required to be at least four times the bolt diameter. For this reason, it is necessary to lock the wedge member in a desired position in consideration of the embedding length in advance. However, depending on the situation such as variations in the inner peripheral surface of the prepared hole, the wedge member often moves together with the tapered portion and does not lock at a desired position. In this case, the expansion position of the wedge member becomes shallow and the bolt protrudes, so that there is a problem that good construction cannot be performed. For this reason, in Japan, the share of wedge anchors in the entire anchor bolt is less than 1%.

  The present invention has been made to solve such a problem, and when being installed in a pilot hole, it can be expanded at a desired depth and can be stably constructed without being driven by a driving tool. However, since it can be temporarily fixed, it can be installed without causing damage or noise of the pilot hole wall due to impact, and it is easy to work, and anchor bolts with good pull-out strength and shear strength at low cost. It aims at providing the manufacturing method of an anchor bolt.

  The anchor bolt according to the present invention is characterized by a main body portion having a male screw formed at one end thereof, a reduced diameter portion that is smaller than the outer diameter of the main body portion, and a tapered shape from the reduced diameter portion toward the tip. A bolt main body having an enlarged taper portion, and an expanding wedge that is fitted to the reduced diameter portion of the bolt main body and is expanded by sliding toward the tip side along the taper portion. The expanded wedge has an expanded piece formed in the same diameter as the outer diameter of the main body portion in a state of being fitted to the reduced diameter portion. The biasing member is biased in the direction of the tapered portion.

  In the present invention, a plurality of wedge guide grooves are formed in the taper portion along the axial direction, and a plurality of sliding frames fitted into the wedge guide grooves are formed on the expanded wedge. It is preferable that each of the tip portions is integrally formed as a tip frame while extending from the spreading piece in the tip direction.

  Further, in the present invention, the bolt main body is formed with a plurality of the reduced diameter portions and the tapered portions alternately along the axial direction, and the widening wedge corresponds to each reduced diameter portion. It is preferable that an expanding piece is provided, and each of the expanding pieces is connected to each other by the sliding frame.

  Further, in the present invention, the widening wedge is formed in a substantially cylindrical shape and formed with a widening piece on which a separation slit for separation along the axial direction is formed, and one end surface separated by the separation slit. An overexpanding stopper convex part having a protrudingly formed expanded part, and an overexpanded part formed on the other end surface facing the overexpanded stopper convex part and having an opening that can be loosely fitted to the expanded part. It is preferable to have an opening prevention stopper recess.

  Further, in the present invention, the bolt main body is formed with a plurality of the reduced diameter portions and the tapered portions alternately along the axial direction, and among these tapered portions, a tapered portion other than the tapered portion at the tip is provided. A plurality of wedge guide grooves are formed along the axial direction, and the widened wedge includes widened pieces corresponding to the respective reduced diameter portions, and each widened piece is the wedge guide. It is preferable that they are connected to each other by a plurality of sliding frames fitted into the grooves.

  In the present invention, the urging member is constituted by a coil spring, and the taper portion is a spiral groove formed in the same spiral direction as the spiral direction of the coil spring, and the spiral groove It is preferable that a spring mounting spiral groove having a groove depth at which the outer diameter of the tapered portion at a position is substantially the same as the inner diameter of the coil spring is formed.

  In addition, the anchor bolt according to the present invention is characterized in that a main body portion having a male screw formed at one end, a reduced diameter portion that is smaller than the outer diameter of the main body portion, and a taper from the reduced diameter portion toward the tip. A bolt body having a taper portion expanded in a shape, and an expanding wedge that is fitted to the reduced diameter portion of the bolt body and is expanded by sliding toward the tip side along the taper portion; The bolt main body is provided with a plurality of the reduced-diameter portions and the tapered portions alternately along the axial direction, and among these tapered portions, the tapered portion other than the tip tapered portion is provided. A plurality of wedge guide grooves are formed in the taper portion along the axial direction, and the widening wedge is substantially the same diameter as the outer diameter of the main body portion while being fitted to the reduced diameter portion. Formed spread pieces, and these spread pieces are each Together are provided in correspondence with the part, in that it is connected to each other by the sliding frame which is fitted into the wedge guide groove.

  Further, in the present invention, each expanding piece of the expanding wedge is separated by a separation slit formed along the axial direction, and the edge portion of the slit is a co-rotation formed by bending the edge portion outward. A prevention edge is preferably formed.

  The anchor bolt manufacturing method according to the present invention is characterized in that a main body portion having a male screw formed at one end, a reduced diameter portion that is smaller than the outer diameter of the main body portion, and from the reduced diameter portion to the tip. A bolt body having a taper portion whose diameter is increased toward the taper, and an expansion that is fitted to the reduced diameter portion of the bolt body and is expanded by sliding toward the tip side along the taper portion. An opening wedge, and the expansion wedge has an expansion piece formed in the diameter substantially the same as the outer diameter of the main body portion in a state of being fitted to the reduced diameter portion. A helical spring engraved in the same spiral direction as the spiral direction of the coil spring, and the outer diameter of the tapered portion at the spiral groove position is For spring mounting with a groove depth that is approximately the same as the inner diameter of the coil spring A method for manufacturing an anchor bolt in which a turning groove is formed, the coil spring being rotated along the spiral groove for spring attachment and the coil spring being attached to the reduced diameter portion, the coil spring and the taper The expansion wedge is wound around the reduced diameter portion so as to be sandwiched between the expansion portion and the expansion wedge mounting step for mounting on the bolt body.

  Further, the anchor bolt manufacturing method according to the present invention is characterized in that a main body portion having a male screw formed at one end portion, a reduced diameter portion having a diameter smaller than the outer diameter of the main body portion, and from the reduced diameter portion to the tip. A bolt body having a taper portion whose diameter is increased toward the taper, and an expansion that is fitted to the reduced diameter portion of the bolt body and is expanded by sliding toward the tip side along the taper portion. An opening wedge, and the expansion wedge has an expansion piece formed in the diameter substantially the same as the outer diameter of the main body portion in a state of being fitted to the reduced diameter portion. An anchor bolt manufacturing method comprising a coil spring that is biased in the direction of the body, wherein the entire main body of the bolt body is formed as a male screw, the coil spring being rotated along the male screw of the main body, A coil bar for attaching a coil spring to the reduced diameter portion A mounting step; and a widening wedge mounting step in which the widening wedge is wound around the reduced diameter portion so as to be sandwiched between the coil spring and the taper portion, and is mounted on the bolt body. It is in.

  According to the present invention, when mounting to a pilot hole, it is possible to perform a stable construction by expanding it at a desired depth, and even if it is not driven by a driving tool, it can be temporarily fixed. Construction that does not cause damage or noise on the wall is possible, and it is easy to work and can realize high pullout strength and shear strength at low cost.

  Hereinafter, a first embodiment of an anchor bolt according to the present invention will be described with reference to the drawings. FIG. 1 is a front view showing an anchor bolt 1A of the first embodiment.

  As shown in FIG. 1, the anchor bolt 1A of the first embodiment is mainly screwed into a bolt main body 2A, an expanding wedge 3A expanded by the bolt main body 2A, and a male screw 21 of the bolt main body 2A. And the nut 4 to be configured.

  Hereinafter, each component will be described in more detail. The bolt body 2A is for expanding the expanding wedge 3A. In the first embodiment, as shown in FIGS. 1 and 2, the bolt main body 2 </ b> A has a main body portion 22 having a male screw 21 formed at one end thereof and a diameter smaller than the outer diameter of the main body portion 22. It has a reduced diameter portion 23 and a tapered portion 24 whose diameter is increased from the reduced diameter portion 23 toward the tip.

  In the first embodiment, the taper portion 24 has a maximum diameter that is substantially the same diameter as the main body portion 22, and a minimum diameter that is substantially the same diameter as the reduced diameter portion 23. As shown in FIG. 2, three wedge guide grooves 25 are formed on the outer peripheral surface of the tapered portion 24 at equal angular intervals along the axial direction. The number of wedge guide grooves 25 is not limited to this, and may be increased or decreased as appropriate.

  The expanding wedge 3 </ b> A is expanded by the bolt body 2 </ b> A and serves as a wedge in the pilot hole H of the structure X. In the first embodiment, as shown in FIGS. 1 and 3, the expanded wedge 3 </ b> A includes a plurality of expanded pieces 31 fitted on the outer periphery of the reduced diameter portion 23, and extends from the expanded pieces 31 in the distal direction. A plurality of slide frames 32 are provided, and a tip frame 33 is formed integrally at each tip portion of the slide frames 32.

  Each spread piece 31 is formed in a substantially cylindrical shape, as shown in the view seen from the distal end side of FIG. 3A and the view seen from the proximal end side of FIG. Is divided into three equal parts in the circumferential direction by three separation slits 34 along the axial direction. Moreover, the cylindrical part comprised by each expansion piece 31 is formed in the state where the outer diameter is substantially the same diameter as the outer diameter of the main-body part 22 in the state fitted to the reduced diameter part 23, and the internal diameter is reduced diameter. It is formed to have substantially the same diameter as the portion 23. Furthermore, the length of each expanded piece 31 in the axial direction is formed to be shorter than the length in the axial direction of the reduced diameter portion 23 so that it can slide with respect to the reduced diameter portion 23.

  The sliding frame 32 extends from the distal end portion of each expanding piece 31 in the distal end direction, is formed in a width that can be inserted into the wedge guide groove 25 and is slidable in the axial direction. It is formed to have a length that protrudes beyond the tip.

  The front end frame 33 is formed in a substantially disc shape and is formed integrally with the front end portion of each sliding frame 32. Note that the shape of the distal end frame 33 is not limited to this, and may be any shape as long as a coil spring 5 described later can be disposed and can be inserted into the pilot hole H.

  As described above, in the first embodiment, when the expanding wedge 3A is attached to the bolt body 2A, the coil spring 5 is interposed between the tip end portion of the taper portion 24 of the bolt body 2A and the tip frame 33 as shown in FIG. The urging member 5 is held. At this time, by loading the urging member 5 in a compressed state, the expanding wedge 3A is always urged toward the distal end of the bolt body 2A, and each expanding piece 31 slides along the tapered portion 24 toward the distal end. It is in a state of being expanded by moving.

  The urging member 5 is not limited to the coil spring 5, and may be an elastic member such as a leaf spring or rubber as long as it urges each of the expanding pieces 31 in the direction of the tapered portion 24. . In the present embodiment, as shown in FIG. 2, a support convex portion 28 for supporting the coil spring 5 is formed on the tip surface of the taper portion 24. However, it is not limited to the support convex portion 28, and the tip end surface may be a concave shape, a curved surface, or a flat surface.

  Next, the operation of the anchor bolt 1A according to the first embodiment having the above-described configuration will be described with reference to FIG.

  When the fastened object Y is fixed to the structure X such as concrete with the anchor bolt 1A of the first embodiment, first, the expanded wedge 3A is inserted into the pilot hole H with the expanded wedge 3A at the head. At this time, in a free state before insertion, the urging member 5 urges each expanding piece 31 in the direction of the tapered portion 24, so that each expanding piece 31 slightly expands along the inclination of the tapered portion 24. Is held in the state. However, since the outer diameter of each expanded piece 31 is substantially the same as that of the main body portion 22 before the expansion, the frictional resistance with the pilot hole H is not so large that it cannot be inserted by hand. Therefore, at the beginning of insertion into the pilot hole H, each of the expanded pieces 31 receives a light frictional resistance with the inner peripheral wall surface of the pilot hole H, and only the bolt main body 2A compresses the urging member 5 forward. Moving.

  When only the bolt main body 2A moves forward while the expanded wedge 3A receives a light frictional resistance, each expanded piece 31 moves away from the tapered portion 24 and the position of the reduced diameter portion 23 as shown in FIG. , Each expanded piece 31 that has been expanded by the tapered portion 24 is reduced in diameter, and the frictional resistance with the pilot hole H is reduced. At substantially the same time, the urging force of the compressed urging member 5 presses the distal end frame 33 in the insertion direction, and the expanding wedge 3A is drawn into the pilot hole H. At this time, each expanded piece 31 is reduced in diameter to approximately the same diameter as the main body portion 22, so that the inner peripheral wall surface of the prepared hole H is not scraped off. In this way, the operator can easily and smoothly insert the anchor bolt 1A into the pilot hole H by simply pushing the bolt body 2A by hand without using a driving tool.

  Then, if the anchor bolt 1A is inserted to a desired depth and the pushing is stopped, as shown in FIG. 4 (b), the bolt body 2A that has become free is pushed back by the biasing member 5, Each expanding piece 31 is expanded again by the tapered portion 24. Thereby, each expansion piece 31 is pressed and held by the inner peripheral wall surface of the pilot hole H, and the entire anchor bolt 1A is temporarily fastened to the pilot hole H. In this way, it can be easily inserted into the pilot hole H without using a driving tool, and even the pilot hole H opened downward can be easily temporarily attached to a desired depth, which is extremely efficient. Is good.

  Thereafter, the nut 4 screwed into the male screw 21 of the bolt body 2A inserted to a desired position is tightened. Thereby, since a force in the pulling direction acts on the bolt main body 2A, as shown in FIG. 4C, the taper portion 24 expands each of the expanding pieces 31 more greatly. As described above, each expanded piece 31 firmly bites into the pilot hole H as a wedge and exhibits a resistance action in the pulling direction.

According to the first embodiment as described above,
1. When the anchor bolt 1A is inserted into the pilot hole H, it can be easily inserted by hand without using a driving tool, and can be easily temporarily fixed at the desired depth of the pilot hole H. Can be attached.
2. Since there is no impact at the time of driving, damage to the attached object and generation of noise can be prevented.
3. Simply tightening the nut 4 enables easy and quick attachment.
4). Since there is no impact by the driving tool, damage to the prepared hole H wall can be suppressed, so that high pullout strength and shear strength can be maintained.
5. Since it is not necessary to drive in, the anchor bolt 1A can be produced with a low-cost material.

  Next, a second embodiment of the anchor bolt 1B according to the present invention will be described. Note that, in the configuration of the second embodiment, the same or equivalent configuration as the configuration of the first embodiment described above is denoted by the same reference numeral, and the description thereof is omitted.

  FIG. 5 is a front view showing the anchor bolt 1B of the second embodiment. The feature of the second embodiment is that the widening piece 31 of the widening wedge 3B is provided with an over-expansion prevention stopper projection 35, and the sliding frame 32 and the tip frame 33 of the widening wedge 3B are eliminated. The biasing member 5 is held between the expanding piece 31 and the main body 22.

  As shown in FIGS. 5 and 7, the expanding wedge 3 </ b> B of the second embodiment has an expanding piece 31 formed in a substantially cylindrical shape, and this cylinder is formed by a single separation slit 34 along the axial direction. It is separated. An overexpansion prevention stopper convex portion 35 having an expanded portion 35a is formed on one end surface separated by the separation slit 34 so as to protrude from the other end surface facing the overexpansion prevention stopper convex portion 35. A fitting recess 36 is formed. The over-expansion preventing stopper convex portion 35 is formed in an expanded portion 35a whose tip is expanded in a substantially circular shape. Further, the loosely-fitting recess 36 is formed so that the bulging part 35a can be loosely fitted, and its opening is narrowed in accordance with the shape of the over-expansion preventing stopper convex part 35, and the bulging part 35a is loosely fitted. And, it is formed in a shape that can be prevented from coming off. As a result, the expanding wedge 3 </ b> B can be expanded / contracted (expanded / contracted) in the radial direction of the main body 22.

  In the second embodiment, as shown in FIG. 5, the biasing member 5 is compressed and held between the expanding piece 31 and the main body 22. As a result, a pressing force is always applied between the rear end portion of the expanding piece 31 and the front end portion of the main body portion 22, so that the expanding piece 31 is always applied in the direction of the tapered portion 24. Has come to be. In the second embodiment, since the expanded wedge 3B does not have the sliding frame 32 due to the configuration, the wedge guide groove 25 is formed in the tapered portion 24 of the bolt body 2B as shown in FIG. Absent.

  Next, the operation of the anchor bolt 1B according to the second embodiment having the above-described configuration will be described with reference to FIG.

  First, in the anchor bolt 1B of the second embodiment, the expanded wedge 3B is urged by the urging member 5 in the direction of the taper portion 24 in a free state before insertion, as in the first embodiment. The spread piece 31 is held in a state of being slightly expanded along the inclination of the taper portion 24. On the other hand, in the second embodiment, even if a force for excessively expanding the expanding piece 31 of the expanding wedge 3B is applied, the overexpanding preventing stopper convex portion 35 prevents the loose fitting recess 36 from coming off. For this reason, it is prevented that the expansion piece 31 expands too much, and the expansion wedge 3B does not come off from the taper part 24.

  Next, when the fastened object Y is fixed to the structure X such as concrete with the anchor bolt 1B of the second embodiment, first, the bolt body 2B is inserted into the pilot hole H with the tapered portion 24 at the head. During the insertion into the pilot hole H, the expanded wedge 3B, which is slightly expanded, comes into contact with the pilot hole H. Therefore, the insertion is temporarily prevented by the frictional force, but the expanded wedge is quickly countered against the biasing force. Since 3B leaves the taper part 24 and moves to the reduced diameter part 23 and the expanded piece 31 is reduced in diameter, the frictional resistance with the pilot hole H is reduced. As a result, the bolt body 2B can be inserted deeper with a light force.

  Then, when the anchor bolt 1B is inserted to a desired depth and the pushing is stopped, the bolt main body 2B which is in a free state is pushed back by the biasing member 5 as shown in FIG. The part 24 expands the expanded piece 31 again. For this reason, as in the first embodiment, the spread piece 31 is pressed against the inner peripheral wall surface of the pilot hole H to generate a high frictional resistance, and the entire anchor bolt 1B is temporarily secured to the pilot hole H.

  Then, as in the first embodiment, when the nut 4 screwed into the male screw 21 of the bolt body 2B is tightened, the expanding piece 31 is further expanded by the taper portion 24 as shown in FIG. As a result, it bites into the pilot hole H and exerts a wedge effect.

  According to the second embodiment as described above, in addition to the effects of the first embodiment described above, the widening wedge 3B is opened too much by the overexpansion prevention stopper convex portion 35 and the loose fitting concave portion 36. Can be regulated.

  Next, a third embodiment of the anchor bolt 1C according to the present invention will be described. Note that, in the configuration of the third embodiment, the same or equivalent components as those of the first and second embodiments described above are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 9 is a front view showing the anchor bolt 1C of the third embodiment. The feature of the third embodiment is that the front end frame 33 functions as the urging member 5.

  In the third embodiment, as shown in FIGS. 9 to 11, the distal end frame 33 of the expanding wedge 3 </ b> C is curved into a shape in which two semicircular arcs are connected, and the protruding connecting portion 37 is formed as a result. An urging member 5 that generates an urging force is configured as a fulcrum. The distal end frame 33 is made of a material that can be elastically deformed by a pressing force applied to the connecting portion 37. The length of the sliding frame 32 is set so that the connecting portion 37 applies a pressing force to the tapered portion 24 in a free state. The shape of the tip frame 33 is not limited to that described above, and may be any shape that can apply a pressing force to the tip of the taper portion 24 of the bolt body 2C. In addition, an accommodation groove 26 that can accommodate the urging member 5 is formed on the distal end surface of the tapered portion 24.

  Next, the operation of the anchor bolt 1C according to the third embodiment having the above-described configuration will be described with reference to FIG.

  First, when the fastened object Y is fixed to the structure X such as concrete with the anchor bolt 1C of the third embodiment, it is inserted into the pilot hole H with the expanded wedge 3C at the head. At this time, in the free state before insertion, the expanding piece 31 is urged so as to be slidably contacted with the tapered portion 24 by the urging force in the distal direction of the urging member 5. It is held in a state of being slightly expanded along the inclination.

  When the insertion is started, as in the first embodiment, in the initial stage of insertion, the expanding piece 31 receives a frictional resistance between the inner peripheral wall surface of the pilot hole H, and the bolt main body 2C serves as the biasing member 5. The front end frame 33 is moved forward while being compressed. At this time, as shown in FIG. 12 (a), since the connecting portion 37 is compressed and stretched, the distal end frame 33 is separated from the tapered portion 24 and contracted to reduce the frictional resistance. Reduced. For this reason, the front end frame 33 as the urging member 5 pulls the spread piece 31 in the insertion direction via the sliding frame 32.

  Subsequently, when the anchor bolt 1C is inserted to a desired depth and the pushing is stopped, the bolt main body 2C in a free state is moved rearward by the tip frame 33 as the urging member 5 as shown in FIG. Since it is pushed back, the taper part 24 expands the expansion piece 31 again. For this reason, as in the first embodiment, the spread piece 31 is pressed against the inner peripheral wall surface of the pilot hole H to cause frictional resistance, and the entire anchor bolt 1C is temporarily fastened to the pilot hole H.

  Then, as in the first embodiment, when the nut 4 screwed into the male screw 21 of the bolt body 2C is tightened, the expanding piece 31 is further expanded by the taper portion 24 as shown in FIG. Therefore, it bites into the pilot hole H and exhibits a wedge effect.

  According to the third embodiment as described above, if the spring force can be adjusted as appropriate in addition to the operational effects of the first embodiment, the number of parts can be reduced by using the tip frame 33 as the biasing member 5. The product cost can be reduced.

  Next, a fourth embodiment of the anchor bolt 1D according to the present invention will be described. Note that, in the configuration of the fourth embodiment, the same or equivalent components as those of the first to third embodiments described above are denoted by the same reference numerals, and the description thereof is omitted.

  13 and 14 are a front view and a left side view showing the anchor bolt 1D of the fourth embodiment. The feature of the fourth embodiment is that a widening wedge 3D in which the widening wedge 3A of the first embodiment is a double type is used, and that each widening piece 31 is provided with a co-rotation preventing edge 38. It is in.

  In the fourth embodiment, the bolt main body 2D is formed with two reduced diameter portions 23 and two tapered portions 24 along the axial direction, as shown in FIGS. Each of the taper portions 24, 24 is formed with three wedge guide grooves 25 at equal angular intervals in the circumferential direction, and these wedge guide grooves 25 are arranged so as to be in a straight line in the axial direction. Yes.

  On the other hand, as shown in FIG. 13, the expanding wedge 3 </ b> D includes an expanding piece 31 corresponding to each of the reduced diameter portions 23, 23 of the bolt body 2 </ b> D. As shown in FIGS. 17 and 18, each of the spread pieces 31 is connected to each other in the axial direction by a sliding frame 32. In addition, each spread piece 31 is separated by a separation slit 34 formed along the axial direction, and an edge portion of the separation slit 34 is a joint rotation prevention edge 38 formed by bending the edge portion outward. Is formed.

  In the fourth embodiment, the co-rotation preventing edge 38 is formed at the edge portion of the edge portion constituting the separation slit 34 on the side in which the nut is tightened (usually clockwise). For this reason, as shown in FIG. 14, the edge part of the expansion piece 31 in the tightening direction of the nut is turned up to the outside, and the rotation of the expansion wedge 3D more effectively by engaging with the pilot hole H. Is to prevent.

  Next, the operation of the anchor bolt 1D according to the fourth embodiment having the above-described configuration will be described with reference to FIG.

  When the fastened object Y is fixed to the structure X such as concrete with the anchor bolt 1D according to the fourth embodiment, first, the widening wedge 3D is placed at the head and inserted into the pilot hole H. At this time, in a free state before insertion, the urging member 5 urges each expanding piece 31 in the direction of each tapered portion 24, so that each expanding piece 31 is slightly along the inclination of each tapered portion 24. It is held in an expanded state.

  When the bolt body 2D is pushed forward, as shown in FIG. 19 (a), each expanded piece 31 moves away from each tapered portion 24 and moves to each reduced diameter portion 23 to reduce the diameter. The frictional resistance is reduced. Further, the tip frame 33 is pressed in the insertion direction by the urging force of the urging member 5, and the expanding wedge 3 </ b> D is drawn into the pilot hole H. Thus, the operator can easily and smoothly insert the anchor bolt 1D into the pilot hole H by simply pushing the bolt body 2D by hand without using a driving tool.

  Subsequently, when the pushing of the bolt main body 2D is stopped, the bolt main body 2D in a free state is pushed back by the urging member 5 as shown in FIG. For this reason, each expansion piece 31 provided in a duplex manner is expanded again by each taper portion 24. Thereby, each expansion piece 31 is pressed and held by the inner peripheral wall surface of the pilot hole H, and the entire anchor bolt 1D is temporarily fixed to the pilot hole H.

  Thereafter, the nut 4 screwed into the male screw 21 of the bolt body 2D is tightened. At this time, the co-rotation preventing edge 38 is locked in the lower hole H to prevent the bolt body 2D and the expanding wedge 3D from co-rotating. And since the force of a drawing direction acts on bolt main body 2D, as shown in FIG.19 (c), each taper part 24 expands each expansion piece 31 more largely. Thereby, each expansion piece 31 and 31 provided in 2 series type bites into the prepared hole H firmly as a wedge, and there exists a high resistance action to the extraction direction.

  According to the fourth embodiment as described above, in addition to the operational effects of the first embodiment described above, it is possible to achieve a larger pulling strength while having a simple configuration. In addition, it is possible to improve seismic resistance against rolling or pitching caused by an earthquake or the like. Furthermore, the co-rotation preventing edge 38 can prevent co-rotation during tightening.

  Next, a fifth embodiment of the anchor bolt 1E according to the present invention will be described. Note that, in the configuration of the fifth embodiment, the same or equivalent components as those of the first to fourth embodiments described above are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 20 is a front view showing an anchor bolt 1E of the fifth embodiment. The feature of the fifth embodiment is that a widening wedge 3E in which the widening wedge 3B of the second embodiment is a double type is used.

  In the fifth embodiment, as shown in FIG. 21, the bolt main body 2 </ b> E is formed with two reduced diameter portions 23 and two tapered portions 24 alternately along the axial direction. In addition, two wedge guide grooves 25 are formed along the axial direction in the tapered portion 24 on the main body portion 22 side among the tapered portions 24 and 24 at equal angular intervals in the circumferential direction.

  On the other hand, as shown in FIG. 22, the expanding wedge 3E includes an expanding piece 31 corresponding to each of the reduced diameter portions 23, 23 of the bolt body 2E. Each of the spread pieces 31 is connected to each other in the axial direction by a plurality of sliding frames 32 fitted into the wedge guide grooves 25. Each of the expanding pieces 31 is provided with an overexpanding prevention stopper convex portion 35 and a loosely fitting concave portion 36. In addition, when it has three or more diameter-reduced parts 23 and the expansion piece 31 in the axial direction, in order to slide the sliding frame 32 which connects each expansion piece 31, taper part 24 other than the taper part 24 of a front-end | tip. The wedge guide groove 25 may be formed in the bottom.

  Next, the operation of the anchor bolt 1E according to the fifth embodiment having the above-described configuration will be described with reference to FIG.

  First, as in the second embodiment, the anchor bolt 1E of the fifth embodiment is in a free state before being inserted, even if a force for excessively expanding the expanding piece 31 of the expanding wedge 3E is applied. The overexpanded prevention stopper convex portion 35 is prevented from coming off in the loosely fitting concave portion 36. For this reason, it is prevented that the expansion piece 31 expands too much, and the expansion wedge 3E does not come off from the taper part 24.

  Next, when the fastened object Y is fixed to the structure X such as concrete by the anchor bolt 1E of the fifth embodiment, the bolt body 2E is pushed forward. Accordingly, as shown in FIG. 23 (a), each of the expanded pieces 31 moves from the tapered portion 24 to the reduced diameter portion 23 to be reduced in diameter, so that the frictional resistance with the pilot hole H is reduced. Therefore, the bolt body 2E can be inserted further with a light force.

  Next, when the push-in of the bolt main body 2E is stopped, the bolt main body 2E in a free state is pushed back by the urging member 5 as shown in FIG. For this reason, each expansion piece 31 and 31 provided in 2 series is expanded again by each taper part 24 and 24. FIG. Thereby, like the second embodiment, each of the expanded pieces 31, 31 is pressed against the inner peripheral wall surface of the prepared hole H to generate a high frictional resistance, and the entire anchor bolt 1 </ b> E is temporarily fixed to the prepared hole H.

  Then, similarly to the second embodiment, the nut 4 screwed into the male screw 21 of the bolt body 2E is tightened. At this time, the co-rotation preventing edge 38 is locked in the lower hole H to prevent the bolt body 2E and the expanding wedge 3E from co-rotating. And since the force of a drawing direction acts on the volt | bolt main body 2E, as shown in FIG.23 (c), each expansion piece 31 and 31 is expanded more largely by each taper part 24 and 24, respectively. Thereby, each expansion piece 31 and 31 bites into the pilot hole H strongly, and exhibits a larger wedge effect.

  According to the fifth embodiment as described above, in addition to the operational effects of the second embodiment described above, it is possible to realize a larger pulling strength while having a simple configuration. In addition, it is possible to improve seismic resistance against rolling or pitching caused by an earthquake or the like. Furthermore, the co-rotation preventing edge 38 can prevent co-rotation during tightening.

  Next, a sixth embodiment of the anchor bolt 1F according to the present invention will be described. Note that, in the configuration of the sixth embodiment, the same or equivalent components as those of the first to fifth embodiments described above are denoted by the same reference numerals, and the description thereof is omitted.

  24 and 25 are a front view and a left side view showing the anchor bolt 1F of the sixth embodiment. The feature of the sixth embodiment is that it has a simple configuration without using the biasing member 5.

  In the bolt main body 2F of the sixth embodiment, similarly to the bolt main body 2E of the fifth embodiment, two reduced diameter portions 23 and two taper portions 24 are alternately formed along the axial direction. Of the tapered portions 24, 24, three wedge guide grooves 25 are formed along the axial direction in the tapered portion 24 on the main body portion 22 side at equal angular intervals in the circumferential direction.

  On the other hand, as shown in FIG. 26, the expanding wedge 3 </ b> F has the expanding pieces 31 and 31 connected by three sliding frames 32. And as shown in FIG. 24, it forms in the substantially cylindrical shape so that the one separation slit 34 may be formed. In addition, each of the spread pieces 31, 31 constitutes a co-rotation preventing edge 38 by bending the edge portion of the separation slit 34 outward. In the sixth embodiment, since the temporary fastening function by the urging member 5 is not provided, the diameter of the expanded wedge 3F is formed to be slightly larger than the diameter of the pilot hole H.

  Next, the operation of the anchor bolt 1F in the sixth embodiment having the above-described configuration will be described with reference to FIG.

  First, when the fastened object Y is fixed to the structure X such as concrete with the anchor bolt 1F of the sixth embodiment, it is inserted into the pilot hole H with the tapered portion 24 at the head. In the sixth embodiment, since the expanding wedge 3F is formed to have a larger diameter than the pilot hole H, it is driven by a driving tool such as a hammer as shown in FIG.

  When the anchor bolt 1F is driven to a desired depth, as shown in FIG. 26 (b), each of the expanding pieces 31 and 31 of the expanding wedge 3F strongly presses the inner peripheral wall surface of the pilot hole H, and a large frictional resistance is obtained. In order to make it generate | occur | produce, the anchor bolt 1F will be in the state temporarily fixed by the pilot hole H. FIG.

  Then, as shown in FIG. 27C, the nut 4 screwed into the male screw 21 of the bolt body 2F is tightened. At this time, the co-rotation preventing edge 38 is locked in the lower hole H to prevent the bolt body 2F and the expanding wedge 3F from co-rotating. And since the force of a drawing direction acts on the bolt main body 2F, each expansion piece 31 and 31 is expanded more largely by each taper part 24 and 24, respectively. Thereby, each expansion piece 31 and 31 bites into the pilot hole H strongly, and exhibits a big wedge effect.

  According to the sixth embodiment as described above, a large pulling strength can be realized by the double-type expansion wedge 3F. Moreover, since the biasing member 5 is not used, the assembly work of the anchor bolt 1F can be facilitated and speeded up, and the product cost can be reduced.

  Next, a seventh embodiment of the anchor bolt 1G according to the present invention will be described. Note that, in the configuration of the seventh embodiment, the same or equivalent components as those of the first to sixth embodiments described above are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 28 is a front view showing an anchor bolt 1G of the seventh embodiment. The feature of the seventh embodiment is that the anchor bolt 1B of the second embodiment is provided with a spring mounting spiral groove 27 that makes it easy to attach the coil spring 5 as the biasing member 5 to the reduced diameter portion 23.

  The bolt body 2G of the seventh embodiment is formed in substantially the same shape as the bolt body 2B of the second embodiment. Then, as shown in FIG. 29, a spring mounting spiral groove 27 is engraved in the tapered portion 24 along the same spiral direction as the spiral direction of the coil spring 5 from the tip portion. In the seventh embodiment, in order to guide the coil spring 5 to the reduced diameter portion 23 more smoothly, the groove depth of the spring mounting spiral groove 27 is the outer diameter of the tapered portion 24 at the position where the spring mounting spiral groove 27 is formed. Is formed with a groove depth substantially equal to the inner diameter of the coil spring 5. Further, the total length of the spring mounting spiral groove 27 is formed up to a position where the outer diameter of the tapered portion 24 at the terminal end is substantially the same as the inner diameter of the coil spring 5. The groove depth of the spring mounting spiral groove 27 may be in a range in which the coil spring 5 can be guided to the reduced diameter portion 23.

  Next, a manufacturing method of the anchor bolt 1G according to the seventh embodiment having the above-described configuration will be described with reference to FIG.

  First, when assembling the anchor bolt 1G of the seventh embodiment, as shown in FIG. 30A, after the end of the coil spring 5 is introduced from the tip of the spring mounting spiral groove 27, the coil spring 5 is rotated. Let Thereby, since the coil spring 5 is guided along the spring mounting spiral groove 27, it is easily and quickly attached to the reduced diameter portion 23 (coil spring attaching step).

  After the coil spring 5 is attached to the reduced diameter portion 23, as shown in FIG. 30B, the expanded wedge 3G in an unfolded state is wound around the reduced diameter portion 23 and attached to the bolt body 2G (expanded wedge attachment). Step). At this time, the expanding wedge 3G is wound so as to be sandwiched between the coil spring 5 and the tapered portion 24.

  After winding the expanding wedge 3G, as shown in FIG. 30C, the overexpanding prevention stopper convex portion 35 is loosely fitted into the loosely fitting concave portion. Thereby, the overexpansion prevention stopper convex part 35 is prevented from coming off in the loose fitting recess 36 (overexpansion prevention stopper convex part loose fitting step).

  In the seventh embodiment, the expanding wedge 3G including the overexpanding prevention stopper convex portion 35 and the loosely fitting concave portion 36 is used. However, the present invention is not limited to this, and the taper portion 24 expands. What is necessary is just to be a spreading wedge. Further, the spring mounting spiral groove 27 of the seventh embodiment can be applied to the anchor bolts 1B and 1E of the type in which the coil spring 5 is mounted to the reduced diameter portion 23 as in the second embodiment and the fifth embodiment. it can. However, when applied to the anchor bolt 1E of the fifth embodiment, it is preferable to form the spring mounting spiral groove 27 in each of the tapered portions 24.

  According to the seventh embodiment as described above, among the anchor bolts according to the present invention, the manufacturing work of the anchor bolt of the type in which the coil spring 5 is attached to the reduced diameter portion 23 can be facilitated and speeded up.

  Next, an eighth embodiment of the anchor bolt 1H according to the present invention will be described. Note that, in the configuration of the eighth embodiment, the same or equivalent components as those of the first to seventh embodiments described above are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 31 is a front view showing an anchor bolt 1H of the eighth embodiment. The feature of the eighth embodiment is that the entire body 22 of the bolt body 2H is configured as a male screw 21 in the anchor bolt 1B of the second embodiment.

  As shown in FIG. 31, the bolt body 2 </ b> H of the eighth embodiment is formed as a male screw 21 as a whole. Therefore, when attaching the coil spring 5 to the reduced diameter portion 23, as shown in FIG. 32, after the coil spring 5 is introduced into the thread groove of the male screw 21 from the rear end side of the main body portion 22, the coil spring 5 is rotated. Accordingly, since the coil spring 5 is guided along the male screw 21, it is easily and quickly attached to the reduced diameter portion 23 (coil spring attaching step).

  Subsequently, as in the seventh embodiment, the expanded wedge 3H in the expanded state is wound around the reduced diameter portion 23 and mounted on the bolt body 2H (expanded wedge mounting step). At this time, in the seventh embodiment, the crest diameter of the male screw 21 is formed larger than the inner diameter of the coil spring 5. For this reason, the coil spring 5 is sandwiched between the male screw 21 and the expanding wedge 3H.

  According to the eighth embodiment as described above, among the anchor bolts according to the present invention, the manufacturing work of the anchor bolt of the type in which the coil spring 5 is attached to the reduced diameter portion 23 can be facilitated and speeded up. In particular, in the case of the bolt body 2E having a plurality of tapered portions 24 as in the fifth embodiment described above, the spring mounting spiral groove 27 of the seventh embodiment described above is separately provided as shown in FIG. The coil spring 5 can be easily and quickly attached to the reduced diameter portion 23 without any problem.

  The anchor bolts 1A to 1H according to the present invention are not limited to the above-described embodiments, and can be changed as appropriate. For example, the position of the urging member 5 is not limited to the position of the above-described embodiment, and it is sufficient that the expanding wedge is urged in the distal direction. Further, the shape of the expanded wedge 31 of the expanded wedge is appropriately selected although there is a difference in ease of processing, ease of fitting into the bolt main bodies 2A to 2H, and ease of expansion / reduction. Is possible.

  Further, in the second, fifth, seventh and eighth embodiments described above, the construction of the overexpanding prevention stopper convex portion 35 and the loosely fitting concave portion 36 is the anchor of the first, third, fourth and sixth embodiments. It may be applied to bolts. Conversely, in the second, fifth, seventh, and eighth embodiments described above, the overspreading prevention stopper convex portion 35 and the loose fitting concave portion 36 are not provided, and the linear separation slit 34a shown in FIG. Expanding wedges 3I and 3J having only the wavy separation slit 34b shown in FIG. 35 may be used.

  Further, in the second, seventh and eighth embodiments described above, an expanding wedge 3K having a uniform expanding slit 39 as shown in FIG. 36 (a) may be used. The uniform expansion slit 39 is formed along the axial direction from the end on the taper portion 24 side, and is equiangular with the separation slit 34 in the circumferential direction of the expansion wedge 3K, as shown in FIG. It is preferable to form it at intervals. Thereby, since the expansion piece 31 is expanded uniformly, it engages with the pilot hole H in a well-balanced manner, and the pull-out strength is effectively improved.

  Further, the uniform expanding slit 39 may be applied to the expanding wedge 3E of the fifth embodiment described above as shown in FIG. 37 (a), as shown in FIGS. 37 (b) and 37 (c). Thus, you may apply to the expansion wedge 3I and 3J mentioned above. In these cases, the co-rotation preventing edge 38 is provided in each of the spread pieces 31 partitioned by the uniform spread slit 39, and the co-rotation prevention function is improved.

  In the first and fourth embodiments described above, each sliding frame 32 extended from each spreading piece 31 is integrally formed by the tip frame 33, but the present invention is not limited to this. . For example, as shown in FIGS. 38 (a) to 38 (c), each expanding piece 31 is formed integrally with only one separation slit 34, and the distal end portion of each sliding frame 32 is about 90 °. You may use the expansion wedge 3L which bent and comprised the front-end | tip frame 33. FIG.

  Furthermore, the spreading pieces 31 of the spreading wedges 3A to 3K are not limited to the number shown in the above-described embodiment, and may be appropriately increased or decreased according to the bolt diameter or the like. Further, the expanding wedges of the fourth to sixth and eighth embodiments described above are not limited to the duplex type, and may be appropriately set to a triple type or more according to the application.

It is a front view which shows 1st Embodiment of the anchor bolt which concerns on this invention. It is a front view which shows the volt | bolt main body of this 1st Embodiment. It is the (a) left view (b) right view which shows the expansion wedge of this 1st Embodiment. It is explanatory drawing which shows the attachment operation | work of the anchor bolt of this 1st Embodiment. It is a front view which shows 2nd Embodiment of the anchor bolt which concerns on this invention. It is a top view which shows the volt | bolt main body of this 2nd Embodiment. It is the (a) left side view (b) front view which shows the expansion wedge of this 2nd Embodiment. It is explanatory drawing which shows the attachment operation | work of the anchor bolt of this 2nd Embodiment. It is a front view which shows 3rd Embodiment of the anchor bolt which concerns on this invention. It is a partial sectional view showing a bolt main part of a 3rd embodiment. It is the (a) left view (b) front view which shows the expansion wedge of this 3rd Embodiment. It is explanatory drawing which shows the attachment operation | work of the anchor bolt of this 3rd Embodiment. It is a front view which shows 4th Embodiment of the anchor bolt which concerns on this invention. FIG. 14 is a left side view of FIG. 13. It is the 15A-15A sectional view taken on the line in FIG. It is the (a) left side view and (b) front view which show the volt | bolt main body of this 4th Embodiment. It is a front view which shows the expansion wedge of this 4th Embodiment. It is an expanded view of the expansion wedge of the 4th embodiment. It is explanatory drawing which shows the attachment operation | work of the anchor bolt of this 4th Embodiment. It is a front view which shows 5th Embodiment of the anchor bolt which concerns on this invention. It is a top view which shows the volt | bolt main body of this 5th Embodiment. It is the (a) left side view and (b) development view which show the expansion wedge of the 5th embodiment. It is explanatory drawing which shows the attachment operation | work of the anchor bolt of this 5th Embodiment. It is a front view which shows 6th Embodiment of the anchor bolt which concerns on this invention. It is a left view of FIG. It is an expanded view of the expansion wedge of this 6th Embodiment. It is explanatory drawing which shows the attachment operation | work of the anchor bolt of this 6th Embodiment. It is a front view which shows 7th Embodiment of the anchor bolt which concerns on this invention. (A) Left side view and front view showing the tapered portion of the seventh embodiment, (b) Drawing showing a state rotated 90 ° from (a), and (c) Turning 180 ° from (a). It is a figure which shows a state. It is explanatory drawing which shows the manufacturing process of the anchor bolt of this 7th Embodiment. It is a front view which shows 8th Embodiment of the anchor bolt which concerns on this invention. It is a figure which shows the process of attaching a coil spring to the volt | bolt main body of this 8th Embodiment. It is a figure which shows the process of attaching a coil spring to the volt | bolt main body of this 5th Embodiment. In this invention, it is the (a) front view and (b) development view which show the expansion wedge which has a linear separation slit. In this invention, it is the (a) front view and (b) development view which show the expansion wedge which has a wavy separation slit. In this invention, it is the (a) front view and (b) expansion | deployment figure which show the expansion wedge which has a uniform expansion slit. In this invention, it is an expanded view which shows the other Example of the expansion wedge which has a uniform expansion slit. It is the (a) left side view (b) front view and (c) development view which show the other Example of the expansion wedge of this 4th Embodiment. It is the (a) front view and the (b) BB line sectional view showing the conventional wedge type anchor.

Explanation of symbols

1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H Anchor bolt 2A, 2B, 2C, 2D, 2E, 2F, 2G, 2H Bolt body 3A, 3B, 3C, 3D, 3E, 3F, 3G, 3H, 3I, 3J, 3K, 3L Expanding wedge 4 Nut 5 Energizing member (coil spring)
21 male screw 22 main body portion 23 reduced diameter portion 24 taper portion 25 wedge guide groove 26 receiving groove 27 spring mounting spiral groove 28 support convex portion 31 expanding piece 32 sliding frame 33 tip frame 34 separation slit 34a linear separation slit 34b Wavy separation slit 35 Overexpanded prevention stopper convex part 35a Inflated part 36 Free fitting concave part 37 Joint part 38 Co-rotation preventing edge 39 Uniform spreading slit H Pilot hole X Structure X Fastened object

Claims (10)

Bolt body having a main body portion with a male screw formed at one end, a reduced diameter portion that is smaller than the outer diameter of the main body portion, and a tapered portion that is tapered from the reduced diameter portion toward the tip. And an anchor bolt provided with an expanded wedge that is fitted to the reduced diameter portion of the bolt body and is expanded by sliding toward the tip side along the tapered portion,
The widening wedge has a widening piece formed in the diameter substantially the same as the outer diameter of the main body portion in a state of being fitted to the reduced diameter portion, and biases the widening piece toward the taper portion. A biasing member ,
A plurality of wedge guide grooves are formed in the taper portion along the axial direction, and a plurality of sliding frames fitted into the wedge guide grooves are provided in the distal direction from the expanded pieces in the expanded wedge. An anchor bolt characterized in that each of these tip portions is integrally formed as a tip frame . The bolt main body according to claim 1 , wherein a plurality of the reduced diameter portions and the tapered portions are alternately formed along the axial direction.
The said expansion wedge is provided with the expansion piece corresponding to each said diameter reduction part, These each expansion piece is mutually connected by the said sliding frame, The anchor bolt characterized by the above-mentioned. Bolt body having a main body portion with a male screw formed at one end, a reduced diameter portion that is smaller than the outer diameter of the main body portion, and a tapered portion that is tapered from the reduced diameter portion toward the tip. And an anchor bolt provided with an expanded wedge that is fitted to the reduced diameter portion of the bolt body and is expanded by sliding toward the tip side along the tapered portion,
The widening wedge has a widening piece formed in the diameter substantially the same as the outer diameter of the main body portion in a state of being fitted to the reduced diameter portion, and biases the widening piece toward the taper portion. A biasing member ,
The expanding wedge is formed in a substantially cylindrical shape, and has an expanding piece formed with a separation slit that is separated along the axial direction thereof, and a swelling expansion formed on one end surface separated by the separation slit. An over-expansion prevention stopper convex portion having a portion, and an over-expansion prevention stopper concave portion formed on the other end surface opposed to the over-expansion prevention stopper convex portion and having an opening portion into which the expansion portion can be loosely fitted. An anchor bolt characterized by having . 4. The bolt main body according to claim 3 , wherein a plurality of the reduced-diameter portions and the tapered portions are alternately formed along the axial direction. Of these tapered portions, a tapered portion other than the tapered portion at the tip is formed. Is formed with a plurality of wedge guide grooves along the axial direction,
The widening wedge includes widening pieces corresponding to the respective reduced diameter portions, and the widening pieces are connected to each other by a plurality of sliding frames fitted into the wedge guide grooves. An anchor bolt. In claim 3 or claim 4 ,
The biasing member is composed of a coil spring,
The taper portion is a spiral groove carved in the same spiral direction as the spiral direction of the coil spring, and the outer diameter of the taper portion at the spiral groove position is substantially the same as the inner diameter of the coil spring. An anchor bolt having a spring mounting spiral groove having a depth. Bolt body having a main body portion with a male screw formed at one end, a reduced diameter portion that is smaller than the outer diameter of the main body portion, and a tapered portion that is tapered from the reduced diameter portion toward the tip. And an anchor bolt provided with an expanded wedge that is fitted to the reduced diameter portion of the bolt body and is expanded by sliding toward the tip side along the tapered portion,
The widening wedge has a widening piece formed in the diameter substantially the same as the outer diameter of the main body portion in a state of being fitted to the reduced diameter portion, and biases the widening piece toward the taper portion. A biasing member ,
Each spreading piece of the spreading wedge is separated by a separation slit formed along the axial direction, and a co-rotation preventing edge formed by bending the edge part outward is formed at the edge part of the slit. An anchor bolt characterized by Bolt body having a main body portion with a male screw formed at one end, a reduced diameter portion that is smaller than the outer diameter of the main body portion, and a tapered portion that is tapered from the reduced diameter portion toward the tip. And an anchor bolt provided with an expanded wedge that is fitted to the reduced diameter portion of the bolt body and is expanded by sliding toward the tip side along the tapered portion,
The bolt main body is provided with a plurality of the reduced diameter portions and the tapered portions alternately along the axial direction, and among these tapered portions, the tapered portions other than the tapered portion at the tip are axially provided. A plurality of wedge guide grooves are formed along the
The widening wedge has a widening piece formed in the same diameter as the outer diameter of the main body portion in a state of being fitted to the narrowing diameter portion, and these widening pieces correspond to the respective narrowing diameter portions. The anchor bolts are connected to each other by the sliding frame fitted in the wedge guide groove. In claim 7 ,
Each spreading piece of the spreading wedge is separated by a separation slit formed along the axial direction, and a co-rotation preventing edge formed by bending the edge part outward is formed at the edge part of the slit. An anchor bolt characterized by Bolt body having a main body portion with a male screw formed at one end, a reduced diameter portion that is smaller than the outer diameter of the main body portion, and a tapered portion that is tapered from the reduced diameter portion toward the tip. And an expanded wedge that is fitted to the reduced diameter portion of the bolt body and is expanded by sliding toward the tip side along the tapered portion,
The widening wedge has a widening piece formed in the diameter substantially the same as the outer diameter of the main body portion in a state of being fitted to the reduced diameter portion, and biases the widening piece toward the taper portion. A coil spring, wherein the taper portion has a spiral groove formed in the same spiral direction as the spiral direction of the coil spring, and the outer diameter of the taper portion at the position of the spiral groove is substantially the same as the inner diameter of the coil spring. A method of manufacturing an anchor bolt in which a spring mounting spiral groove having a groove depth to be a diameter is formed,
A coil spring mounting step of rotating the coil spring along the spring mounting spiral groove and mounting the coil spring to the reduced diameter portion;
An expanding wedge mounting step for winding the expanding wedge around the reduced diameter portion so as to be sandwiched between the coil spring and the tapered portion and mounting the expanding wedge on the bolt body. An anchor bolt manufacturing method. Bolt body having a main body portion with a male screw formed at one end, a reduced diameter portion that is smaller than the outer diameter of the main body portion, and a tapered portion that is tapered from the reduced diameter portion toward the tip. And an expanded wedge that is fitted to the reduced diameter portion of the bolt body and is expanded by sliding toward the tip side along the tapered portion,
The widening wedge has a widening piece formed in the diameter substantially the same as the outer diameter of the main body portion in a state of being fitted to the reduced diameter portion, and biases the widening piece toward the taper portion. A method for manufacturing an anchor bolt comprising a coil spring, wherein the entire body of the bolt body is formed as a male screw,
A coil spring attaching step of rotating the coil spring along the male screw of the main body and attaching the coil spring to the reduced diameter portion;
An expanding wedge mounting step for winding the expanding wedge around the reduced diameter portion so as to be sandwiched between the coil spring and the tapered portion and mounting the expanding wedge on the bolt body. An anchor bolt manufacturing method.

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