JP2017115907A - Fastening mechanism and post-execution anchor with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fastening mechanism showing anti-looseness function and that can be easily manufactured.SOLUTION: This invention comprises an anchor bolt 32 and a fastening nut 51 that fasten an object A to be fastened through a right-hand screw threaded form and an anti-looseness bolt 52 contacted with the fastening nut 51 from its axial direction so as to prevent a relative looseness of the fastening nut 51 in respect to the anchor bolt 32.The anchor bolt 32 has a male thread main body 61 and a small diameter female thread part 62 that is smaller than a diameter of the male thread main body 61 recess-formed into the male thread main body 61, the anti-looseness bolt 52 has a small diameter male thread part 66 threadably engaged with the small diameter female thread part 62 in a left-thread engaged form.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a fastening mechanism and a post-installed anchor equipped with the fastening mechanism, which are provided with a loosening prevention function by combining a right screw and a left screw.

  2. Description of the Related Art Conventionally, as a fastening mechanism that exhibits this kind of loosening-preventing function, a mechanism composed of a male screw body that forms a right screw and a left screw and a female screw body that is screwed into the male screw body is known (see Patent Document 1). . In this case, the male threaded body is composed of both male threaded bodies in which a right screw and a left thread are formed in the same region on the outer peripheral surface of the round bar member. The female screw body includes a right female screw body that forms a right screw and a left female screw body that forms a left screw. The right female screw body and the left female screw body are screwed into the male screw body and integrally joined to each other. The Thereby, the internal thread body does not loosen essentially, and exerts a loosening prevention effect at any intermediate position of the external thread body.

Japanese Patent No. 5406168

  Such a male threaded body formed by overlapping the right and left threads in the same region is not only difficult to manufacture a rolling die for rolling it, but also a rolling die. When rolling a male threaded body from a screw material, there is a problem that the facet adheres to the rolling die and it is difficult to continuously manufacture the male threaded body.

  An object of the present invention is to provide a fastening mechanism that has a function of preventing loosening and can be easily manufactured, and a post-installed anchor having the fastening mechanism.

  The fastening mechanism of the present invention includes a male screw member and a female screw member that fasten a fastening object in one of a right-hand screw and a left-hand screw, an axial contact with the female screw member, and a relative relationship between the female screw member and the male screw member. A male screw member having a male screw main body, and a small-diameter female screw portion having a smaller diameter than the male screw main body recessed in the male screw main body. The small-diameter female screw portion has a small-diameter male screw portion that is screwed in the other screw type of the right screw and the left screw.

According to this configuration, in a state where the fastening object is fastened by the male screw member and the female screw member, the small diameter male screw portion of the locking member is screwed to the small diameter female screw portion of the male screw member, and the locking member is brought into contact with the female screw member. . The screw type of the small-diameter male screw part of the locking member and the small-diameter female screw part of the male screw member has a reverse screw relationship with the male screw member and the female screw member, so the female screw member is relative to the male screw member. When starting to loosen, the rotational force transmitted from the female screw member to the locking member acts in the direction of tightening the locking member. Therefore, the loosening prevention member can reliably prevent the relative loosening of the female screw member.
In this case, in the male screw member, the female screw member, and the locking member, the right screw and the left screw are not formed overlapping in the axial direction. For this reason, even if the male screw member, the female screw member, and the locking member are formed by mixing right and left screws, these members can be easily manufactured individually.
In addition, since a large torque (rotational moment) does not act on the screw mechanism portion that prevents loosening of the female screw member, a mechanically rational structure is formed by forming the screw mechanism portion with a small diameter. be able to.

  Another fastening mechanism of the present invention includes a male screw member and a female screw member that fasten a fastening object in one of a right-hand screw and a left-hand screw, and an axial contact with the female screw member, and the female screw member relative to the male screw member. A male screw member having a male screw main body and a small-diameter male screw portion having a smaller diameter than the male screw main body protruding from the threaded end of the male screw main body. The small-diameter male screw portion has a small-diameter female screw portion that is screwed in the other screw type of the right screw and the left screw.

According to this configuration, in a state where the fastening object is fastened by the male screw member and the female screw member, the small diameter female screw portion of the loosening prevention member is screwed to the small diameter male screw portion of the male screw member, and the loosening prevention member is brought into contact with the female screw member. . In contrast to the threaded form of the male screw member and female threaded member, the threaded form of the small diameter female threaded part of the locking member and the small diameter male threaded part of the male threaded member has a reverse thread relationship, so the female threaded member is relative to the male threaded member. When starting to loosen, the rotational force transmitted from the female screw member to the locking member acts in the direction of tightening the locking member. Therefore, the loosening prevention member can reliably prevent the relative loosening of the female screw member.
In this case, in the male screw member, the female screw member, and the locking member, the right screw and the left screw are not formed overlapping in the axial direction. For this reason, even if the male screw member, the female screw member, and the locking member are formed by mixing right and left screws, these members can be easily manufactured individually.
In addition, since a large torque (rotational moment) does not act on the screw mechanism portion that prevents loosening of the female screw member, a mechanically rational structure is formed by forming the screw mechanism portion with a small diameter. be able to.

  In these cases, it is preferable that the female screw member has an axial dimension such that the screwed end portion of the fastened male screw main body is in a non-projecting state.

  According to this configuration, the male screw member, the female screw member, and the loosening prevention member can have a simple shape, and can be easily manufactured individually.

  Similarly, it is preferable that the loosening-preventing member has a scooping portion that receives the threaded end portion of the male screw main body protruding from the female screw member in the fastened state.

  According to this configuration, even if the screwing end portion of the male screw main body protrudes from the female screw member in a state where the fastening object is fastened, the loosening prevention member can be appropriately brought into contact with the female screw member.

  A post-installed anchor of the present invention includes a sleeve portion having an expanded portion at a tip portion, a bolt portion having a cone portion that is inserted through the sleeve portion and expands the expanded portion, and the fastening mechanism described above. The bolt portion also serves as a male screw member.

  According to this configuration, even if mechanical vibration or seismic motion repeatedly acts on the fastening object, the female screw member is not loosened, and the reliability of the post-construction anchor can be improved while suppressing an increase in cost.

It is a structural diagram of the construction state of the post-construction anchor which concerns on 1st Embodiment. It is an expanded sectional view around the fastening mechanism of a post-construction anchor. It is explanatory drawing showing the construction method of the post-construction anchor. It is an expanded sectional view around the fastening mechanism of the post-construction anchor concerning the modification of 1st Embodiment. It is an expanded sectional view around the fastening mechanism of the post-installation anchor of 2nd Embodiment. It is an expanded sectional view around the fastening mechanism of the post-installation anchor which concerns on the modification of 2nd Embodiment.

  Hereinafter, a post-construction anchor to which a fastening mechanism according to an embodiment of the present invention is applied will be described with reference to the accompanying drawings. The post-installed anchor is a so-called metal expansion anchor that is fixed to a concrete structure such as a concrete frame or foundation and fastens (supports / fixes) a fastening object such as a device or instrument. Moreover, this fastening mechanism has a screw locking function and is configured in an exposed portion of a metal expansion anchor that fastens a fastening object.

  FIG. 1 shows a construction state of the post-construction anchor according to the first embodiment. As shown in the figure, the concrete structure C is formed with an anchor hole H composed of a straight-shaped prepared hole Ha and a diameter-enlarged portion Hb which is formed at the back of the prepared hole Ha and expands in a tapered shape. The post-construction anchor 10 is driven into the anchor hole H. The post-construction anchor 10 that is a metal expansion anchor has each component formed of stainless steel or steel.

  The post-installed anchor 10 includes a cylindrical sleeve portion 20 having a widened portion 21 on the distal end side, a bolt portion 30 having a cone portion 31 that widens the widened portion 21 from the inside, and an exposed portion of the bolt portion 30. A fastening mechanism 50 configured. The bolt part 30 has an anchor bolt 32 inserted through the sleeve part 20, and the anchor bolt 32 has a form of a full screw. Further, the cone portion 31 is screwed onto the tip end side of the anchor bolt 32. Furthermore, the fastening mechanism 50 which fastens the fastening target object A is comprised by the base end side used as the exposed part of the anchor bolt 32 (it mentions later for details).

  The sleeve portion 20 is integrally formed of a sleeve main body 22 on the proximal end side and a further widened portion 21 on the distal end side of the sleeve main body 22. An annular thin portion 23 is formed in each of the expanded portion 21 at its base portion and intermediate portion. Although not shown in the drawing, a plurality of (4 to 6) split slits are formed in the expanded portion 21 in the circumferential direction. By the annular thin portion 23 and the split slit, the expanding portion 21 is surely expanded even with a relatively weak driving force.

  The post-installed anchor 10 of the embodiment is of a sleeve driving type, and the expanded portion is driven by driving the sleeve portion 20 into the bolt portion 30 (anchor bolt 32) that is abutted against the bottom of the anchor hole H. 21 rides on the cone 31 and expands. The expanded portion 21 expanded so as to be pushed open by the cone portion 31 is pressed against the expanded diameter portion Hb of the anchor hole H and firmly fixed to the concrete structure C.

  On the other hand, the fastening object A is fastened together with the seat plate B provided on the surface of the concrete structure C to the exposed portion of the post-construction anchor 10 fixed to the concrete structure C. The bolt part 30 (anchor bolt 32) exposed from the concrete structure C is provided with a fastening nut 51 and a loosening bolt 52 so as to attach the fastening object A. The fastening nut 51, the loosening bolt A fastening mechanism 50 that fastens the fastening object A is configured by the exposed portion (base end portion) of 52 and the anchor bolt 32. The fastening nut 51, the loosening bolt 52, and the anchor bolt 32 correspond to a female screw member, a loosening member, and a male screw member, respectively, in the claims.

  Here, with reference to FIG. 2, the fastening mechanism 50 of 1st Embodiment is demonstrated in detail. As shown in the figure, the fastening mechanism 50 is in contact with the anchor bolt 32 (the base end portion) and the fastening nut 51 for fastening the fastening object A, and the fastening nut 51, and the fastening nut 51 is loosened with respect to the anchor bolt 32. And a locking bolt 52 for preventing the above.

  In this case, the anchor bolt 32 has a bolt main body 61 in which a male screw 61a is engraved on the outer peripheral surface, and a small-diameter female screw portion 62 that is recessed in the screwing end (base end) of the bolt main body 61. . The small-diameter female screw portion 62 is disposed coaxially with the bolt body 61 and has a sufficiently smaller diameter than the bolt body 61.

  The fastening nut 51 has a hexagonal nut shape, and a female screw 51a is threaded on the inner peripheral surface thereof. Further, the fastening nut 51 has an axial dimension such that the screwed end portion of the bolt body 61 in the fastened state is in a non-projecting state. Therefore, even if the fastening nut 51 is fastened to the bolt body 61 with a predetermined torque, the screwed end portion of the bolt body 61 does not protrude from the fastening nut 51.

  The loosening bolt 52 is in the form of a hexagonal bolt, and has a hexagonal head 65 and a small-diameter male screw portion 66 that is connected to the head 65 and is screwed into the small-diameter female screw portion 62 of the anchor bolt 32. Yes. In this case, the loosening bolt 52 is tightened so as to strongly contact the tightened fastening nut 51 from the axial direction. In addition, it is preferable that the contact surface of the fastening nut 51 and the loosening bolt 52 has a high friction coefficient by roughening or forming at least one surface.

  The anchor bolt 32 (male screw 61 a) and the fastening nut 51 (female screw 51 a) constitute a screw mechanism that is a right-hand screw type, and the small-diameter female screw portion 62 of the anchor bolt 32 and the small-diameter male screw of the locking bolt 52. The portion 66 constitutes a screw mechanism that is a left-hand screwing type. That is, the right-handed screw mechanism including the anchor bolt 32 and the fastening nut 51 has a function of fastening the fastening object A (and the seat plate B), and includes a small-diameter female screw portion 62 and a small-diameter male screw portion 66. The screw mechanism of the screw functions as a locking mechanism for the right-hand screw mechanism. The outer diameters (hexagons) of the fastening nut 51 and the loosening bolt 52 are preferably dimensions corresponding to the diameters of the female screw 51a and the small-diameter male screw portion 66, respectively. The lead of the left-hand screw mechanism is preferably smaller than the lead of the right-hand screw mechanism.

  Here, with reference to FIG. 3, the construction method of the post-construction anchor 10 is demonstrated easily. As shown in the figure, in this construction method, an anchor hole H is first formed in the concrete structure C (see FIG. 3A). In the anchor hole H, the pilot hole Ha is drilled by a vibration drill or a hammer drill equipped with a concrete drill bit, and then a diameter-expanded portion Hb is formed by an electric drill equipped with a diameter-expanding drill bit.

  Next, the post-construction anchor 10 is driven into the anchor hole H (see FIG. 3B). The post-construction anchor 10 is inserted into the anchor hole H in advance by adjusting the position of the cone portion 31 so as to face the enlarged diameter portion Hb. Subsequently, the sleeve portion 20 is driven using a dedicated driving rod. As a result, the expanded portion 21 of the sleeve portion 20 expands radially outward, and is pressed against the inner peripheral surface of the expanded diameter portion Hb (fixing).

  Next, the seat plate B and the fastening object A are set on the anchor bolt 32 protruding from the anchor hole H, and the fastening nut 51 is screwed (see FIG. 3C). The seat plate B and the fastening object A are formed with a hole for insertion of the anchor bolt 32, and the seat plate B and the fastening object A are set to the anchor bolt 32 through the hole. When the seat plate B and the fastening object A are set on the anchor bolt 32, the fastening nut 51 is screwed onto the anchor bolt 32, and the seat plate B and the fastening object A are tightened with a predetermined torque.

  Finally, the loosening bolt 52 is screwed onto the anchor bolt 32 (see FIG. 3D). The anchor bolt 32 to which the fastening nut 51 is tightened has a screwed end located in the fastening nut 51, and a loosening bolt 52 is screwed to the anchor bolt 32. That is, the small-diameter male screw portion 66 of the locking bolt 52 is screwed with the small-diameter female screw portion 62 of the anchor bolt 32, and the head 65 of the locking bolt 52 is tightened so as to be in strong contact with the fastening nut 51.

  Thus, the fastening object A is received by the concrete structure C and fastened by the anchor bolt 32 and the fastening nut 51 having a right-hand screwing type. Further, the loosening bolt 52 screwed into the anchor bolt 32 in a left-hand threaded manner is pressed against the fastening nut 51. Since the loosening bolt 52 and the fastening nut 51 are in strong contact, if an attempt is made to rotate counterclockwise in the direction in which the fastening nut 51 is loosened due to vibration or the like, this rotation acts in the direction in which the loosening bolt 52 is tightened. Therefore, loosening of the fastening nut 51 with respect to the anchor bolt 32 is reliably prevented.

  Next, with reference to FIG. 4, a fastening mechanism 50A according to a modification of the first embodiment will be described. As shown in the figure, in this fastening mechanism 50 </ b> A, the threaded end portion of the anchor bolt 32 (bolt body 61) slightly protrudes from the fastening nut 51 in a state where the fastening nut 51 is fastened. For this reason, the loosening bolt 52 is formed with a pinching portion 71 for receiving the screwing end portion of the bolt main body 61.

  The swaging portion 71 is formed of an annular groove that is positioned around the small-diameter male screw portion 66 and is recessed in the head 65, and has an outer diameter that is somewhat larger than that of the bolt body 61. Accordingly, when the loosening bolt 52 is screwed into the anchor bolt 32, the loosening bolt 52 is pressed against the fastening nut 51 in a state where the screwing end portion of the bolt main body 61 is received, and functions as a loosening prevention of the fastening nut 51. .

  As described above, in the fastening mechanisms 50 and 50A of the first embodiment, the fastening nut 51 is screwed to the anchor bolt 32 in a right-hand screwing manner, whereas the loosening bolt 52 is screwed to the left-hand screw. It is screwed to the anchor bolt 32 in a form and contacts the fastening nut 51. For this reason, the locking bolt 52 can function as a locking of the fastening nut 51. In addition, by forming the loosening bolt 52 with a small diameter on which a large rotational moment does not act, a mechanically rational structure can be obtained.

  In addition, the fastening nut 51 and the locking bolt 52 are not originally formed by overlapping the right screw and the left screw in the anchor bolt 32, and the anchor bolt 32, the fastening nut 51, and the locking bolt 52 are respectively provided. Easy to manufacture. That is, the fastening mechanisms 50 and 50A of the first embodiment can be easily manufactured while exhibiting a loosening prevention function.

  Furthermore, the fastening nut 51 does not loosen even when subjected to repeated loads and vibrations, and the reliability of the post-installed anchor 10 can be improved.

  Next, a fastening mechanism 50B of the second embodiment will be described with reference to FIG. As shown in the figure, in this fastening mechanism 50B, the anchor bolt 32 (the base end portion) and the fastening nut 51 that fasten the fastening object A are in contact with the fastening nut 51, and the fastening nut 51 is attached to the anchor bolt 32. And a locking nut 53 for preventing loosening. In this case, the anchor bolt 32 includes a bolt main body 61 in which a male screw 61 a is screwed on the outer peripheral surface, and a small-diameter male screw portion 63 that is formed to protrude from a screwing end (base end) of the bolt main body 61. The small-diameter male screw portion 63 is disposed coaxially with the bolt body 61 and has a sufficiently smaller diameter than the bolt body 61.

  The loosening nut 53 has a small-diameter female thread portion 67 corresponding to the small-diameter male thread portion 63 of the anchor bolt 32. That is, the loosening nut 53 has a hexagonal nut shape, and a small-diameter female screw portion 67 that is screwed into the small-diameter male screw portion 63 is formed on the inner peripheral surface thereof. Also in this case, the loosening nut 53 is tightened so as to strongly contact the tightened fastening nut 51 from the axial direction. In addition, the anchor bolt 32 and the fastening nut 51 constitute a screw mechanism that is a right-hand screw type, and the small-diameter male screw portion 63 of the anchor bolt 32 and the small-diameter female screw portion 67 of the locking nut 53 are left-handed screws. A screw mechanism that is screwed is configured.

  Next, a fastening mechanism 50C according to a modification of the second embodiment will be described with reference to FIG. As shown in the figure, in this fastening mechanism 50C, the screwed end portion of the bolt body 61 slightly protrudes from the fastening nut 51 in a state where the fastening nut 51 is fastened, as in the above modification. For this reason, the loosening nut 53 is formed with a pinching portion 71 for receiving the screwed end portion of the bolt body 61.

  The swaging portion 71 is formed of an annular groove that is located around the small-diameter female screw portion 67 and is recessed in the head 65, and has an outer diameter that is somewhat larger than that of the bolt body 61. . Thus, when the locking nut 53 is screwed into the anchor bolt 32, the locking nut 53 is pressed against the fastening nut 51 in a state where the threaded end portion of the bolt body 61 is received, and functions as a locking stopper for the fastening nut 51. .

  As described above, in the fastening mechanisms 50B and 50C of the second embodiment, as in the first embodiment, the fastening nut 51 is screwed to the anchor bolt 32 in a right-handed screw type, whereas the locking nut 51 is loosened. 53 is screwed into the anchor bolt 32 in a left-hand threaded manner and contacts the fastening nut 51. For this reason, the locking nut 53 can function as a locking of the fastening nut 51.

  Moreover, while having a function of preventing loosening, it can be easily manufactured, and the reliability of the post-construction anchor 10 can be improved.

  In the above embodiment, the case where the fastening mechanism 50, 50A, 50B, 50C of the present invention is applied to the post-construction anchor 10 has been described. However, the fastening mechanism 50, 50A, 50B, 50C of the present invention is The present invention is not limited to the construction anchor 10 and can be applied to a screw mechanism for fastening various fastening objects A. Further, the post-construction anchor 10 can be applied not only to the sleeve driving type but also to the tightening type.

  DESCRIPTION OF SYMBOLS 10 ... Post-installed anchor, 20 ... Sleeve part, 21 ... Expansion part, 30 ... Bolt part, 31 ... Cone part, 32 ... Anchor bolt, 50, 50A, 50B, 50C ... Fastening mechanism, 51 ... Fastening nut, 52 ... Loosening bolt, 53 ... Loosening nut, 61 ... Bolt body, 62, 66 ... Small-diameter female screw part, 63, 67 ... Small-diameter male screw part, 71 ... Pinch part, A ... Fastening object, C ... Concrete structure, H ... Anchor hole

Claims (5)

A male screw member and a female screw member that fasten an object to be fastened in one of a right screw and a left screw;
A locking member that comes into contact with the female screw member in the axial direction and prevents relative loosening of the female screw member with respect to the male screw member;
The male screw member has a male screw main body, and a small-diameter female screw portion having a smaller diameter than the male screw main body that is recessed and formed at a threaded end of the male screw main body,
The fastening mechanism according to claim 1, wherein the locking member has a small-diameter male screw portion that is engaged with the small-diameter female screw portion in the other screw type of the right screw and the left screw. A male screw member and a female screw member that fasten an object to be fastened in one of a right screw and a left screw;
A locking member that comes into contact with the female screw member in the axial direction and prevents relative loosening of the female screw member with respect to the male screw member;
The male screw member has a male screw main body, and a small-diameter male screw portion having a smaller diameter than the male screw main body formed to protrude from a screwing end of the male screw main body,
The fastening mechanism according to claim 1, wherein the locking member has a small-diameter female screw portion that is screwed into the small-diameter male screw portion in the other screw type of the right screw and the left screw.   The fastening mechanism according to claim 1, wherein the female screw member has an axial dimension such that a screwed end portion of the male screw main body in a fastened state is in a non-projecting state.   3. The fastening mechanism according to claim 1, wherein the loosening-preventing member has a scooping portion that receives a threaded end portion of the male screw main body protruding from the female screw member in a fastened state. A sleeve portion having an expanded portion on the distal end side;
A bolt portion having a cone portion that extends through the sleeve portion and expands the expansion portion;
A fastening mechanism according to any one of claims 1 to 4,
The post-construction anchor, wherein the bolt portion also serves as the male screw member.

Images