JP6246575B2 - Post-construction anchor, anchor tool and construction method - Google Patents

Description

  The present invention relates to a post-installed anchor that is inserted into a hole drilled in a ceiling slab or the like of a building structure, an anchor application tool that is used when a post-installed anchor is constructed, and a construction method therefor.

  Suspension bolts that suspend and support various ceiling structures such as ceiling panels, air conditioners, lighting fixtures, and various pipes are supported by anchors that are embedded and fixed in the ceiling slab, and are suspended from the ceiling slab. It is done. When there is no anchor at the position where the suspension bolt is required, the ceiling slab at that position is drilled, and the suspension anchor is installed and the suspension bolt is installed (for example, Patent Document 1). Conventionally, a technology is known in which a brace serving as an oblique reinforcement is attached to this type of suspension bolt to suppress vibration of the suspension bolt and prevent a ceiling structure from dropping in the event of an earthquake ( Patent Documents 2 and 3). By connecting the brace to the suspension bolt at a position as close as possible to the surface of the ceiling slab, a stronger vibration control structure can be obtained.

JP 2004-162295 A JP 2002-339918 A JP 2012-87860 A

  Incidentally, some ceiling slabs such as building structures have a structure in which concrete 210 or the like is poured and solidified on a deck plate 200 having a thickness of about several millimeters as shown in FIG. In the deck plate 200 used in such a ceiling structure, for example, valley portions 201 and mountain portions 202 are provided at a predetermined pitch, and the rigidity is increased so that the ceiling surface does not bend. The height difference h between the valley 201 and the mountain 202 is, for example, about 75 mm. It should be noted that, instead of repeatedly providing the valley portion 201 and the peak portion 202, ribs that protrude a predetermined length on the lower surface of the deck plate 200 are formed at a predetermined pitch so that sufficient rigidity is exhibited. Exists.

  When the post-construction anchor 220 is constructed in the ceiling structure as shown in FIG. 15, in order to ensure sufficient anchor strength, it is possible to construct the mountain portion 202 instead of the valley portion 201 of the deck plate 200. is necessary. That is, a hole H for constructing an anchor is drilled in the mountain portion 202, and a post-construction anchor 220 is constructed for the hole H. Then, the suspension bolt 240 is connected to the post-construction anchor 220 via the connection nut 230 or the like, and attached in a state of hanging from the ceiling slab.

  However, when the brace 120 is attached to the suspension bolt 240 that is provided on the peak portion 202 of the deck plate 200 and supported by the construction anchor 220, the connecting bracket 110 for fixing the brace 120 below the lower surface of the valley portion 201. It is necessary to attach. This is because, in order to firmly connect the brace 120 to the suspension bolt 240, the coupling bracket 110 is attached to the suspension bolt 240, and the tip of the brace 120 is screwed into the screw portion 111 provided on the coupling bracket 110. It is necessary to strongly press the tip of the brace 120 against the suspension bolt 240 so that no gap is generated between the brace 120 and the suspension bolt 240. At this time, the connecting metal fitting 110 or the brace 120 is connected to the trough of the deck plate 200. This is because it is necessary to attach so as not to interfere with the portion 201. In particular, the hole H for constructing the post-construction anchor 220 is not necessarily formed at the center of the peak portion 202 of the deck plate 200 as shown in FIG. 15, but may be formed at a position close to the wall portion 203. . In such a case, in order to avoid interference with the valley 201, the connecting metal fitting 110 needs to be attached at a position lower than the valley 201. Therefore, when the brace 120 is connected and fixed to the suspension bolt 240, a gap G in which the brace 120 is not connected is generated between the metal fitting 110 and the connection nut 230 as shown in FIG. In such an attachment mode, for example, when a lateral stress acts on the suspension bolt 240 from the brace 120 when an earthquake occurs, the stress concentrates on the clearance G of the suspension bolt 240, and the suspension bolt 240 is a portion of the clearance G. The vibration control effect is reduced. If excessive stress is applied in the lateral direction, the suspension bolt 240 may bend or break at the gap G near the surface of the ceiling slab. It is not enough as a seismic control structure to be adopted.

  Further, this type of anchor is required to be able to be constructed efficiently and safely, and it is not preferable to increase the number of work steps in order to increase the rigidity of the suspension bolt 240 in the gap G.

  Accordingly, the present invention has been made in view of the above problems, and is a post-installed anchor that can be easily and efficiently constructed without bending or bending breakage in the vicinity of the surface of the anchor construction surface. It aims at providing the anchoring tool used when constructing an anchor, and its construction method.

  In order to achieve the above object, the post-installed anchor (1, 1a, 1b) according to the present invention has a first shaft portion in which a first male screw (24) is formed on the tip side from a predetermined position (23) of the rod-shaped body. A shaft member (2) having a second shaft portion (22) formed with a second male screw (25) on the other end side from the predetermined position (23), and a first shaft portion (21) An expansion sleeve (6) having an extended portion (63) formed to extend outwardly by a longitudinal groove (62) on the distal end side, and having an outer diameter that is configured in a substantially cylindrical shape that can be inserted through The shaft member (2) has a through screw hole (71) that gradually shrinks along the axial direction of the shaft member (2) and engages with the first male screw (24) inside, and a small diameter end portion of the expansion sleeve (6). A cone nut (7) mounted on the tip of the first shaft portion (21) in a state of being fitted into the tip portion, and a long nut (31) screwed into the second male screw (25) are configured. The reinforcing member (3) and the reinforcing member (3) are screwed and attached to the second male screw (25). Head nut (4) fixed to the end (2b) of the biaxial portion (22), and at a predetermined position on the outer circumferential surface of the head nut (4), or the outer circumferential surface of the second shaft portion (22) An annular break groove (43) formed at a predetermined position in the vicinity of the head nut (4), and the head nut (4) is mounted with an expansion sleeve (6) and a cone nut (7). With the first shaft portion (21) inserted into the hole (H) formed on the anchor construction surface, the shaft member (2) is rotated by the torque acting on the end side of the fracture groove (43), and the cone nut ( 7) enters the inside of the expansion sleeve (6) to expand the expansion portion (63) outward, and breaks when the torque acting on the end side of the fracture groove (43) exceeds a predetermined value. The groove (43) is broken to stop the rotation of the shaft member (2).

  Further, the post-construction anchors (1, 1a, 1b) having the above-described configuration may be further added with the following configuration. That is, the reinforcing member (3) is configured to advance the tip of the long nut (31) toward the anchor construction surface by torque acting on the long nut (31) after the fracture groove (43) is broken.

  The head nut (4) has a fracture groove (43) at a predetermined position on the outer peripheral surface, and the second shaft (22) advances to the position where the tip of the reinforcing member (3) is substantially the same as the anchor construction surface. In this case, a configuration may be adopted in which a metal fitting for fixing the brace can be attached between the reinforcing member (3) and the head nut (4).

  The head nut (4) has one end screwed into the second male screw (25) formed on the end (2b) of the second shaft portion (22), so that the second shaft portion (22) is engaged. It is good also as a structure which has the screw hole (47) fixed deeply to the edge part (2b) and formed deeper than the position where the fracture | rupture groove | channel (43) was formed in the other end.

  Further, the head nut (4) has a configuration having a cap (45) mounted in the screw hole (47), and the cap (45) has a head nut (4) by breaking the fracture groove (43). A configuration of detaching from the head nut (4) together with the end of the head may be employed.

  The reinforcing member (3) may employ a configuration in which a flange (33) having a shaft diameter larger than that of the long nut (3) is provided at the tip of the long nut (31).

  The anchor tool (8) according to the present invention is for constructing post-installed anchors (1, 1a, 1b) having any one of the above-described configurations. This anchoring tool (8) engages both the long nut (31) of the reinforcing member (3) and the head nut (4), and the long nut (31) of the reinforcing member (3) In this configuration, a rotational force is simultaneously applied to both the part nut (4).

  Furthermore, the construction method according to the present invention is a method for constructing the post-construction anchor (1, 1a, 1b) having any one of the above-described configurations. In this construction method, the first shaft portion (21) of the shaft member (2) is pre-perforated with the expansion sleeve (6) and the cone nut (7) attached to the first shaft portion (21). (H) An anchoring tool that engages with both the step of inserting into the head nut (4) fixed to the end (2b) of the second shaft portion (22) and the long nut (31). (8) mounting step, and by rotating the anchoring tool (8) in a predetermined direction, the shaft member (2) is rotated via the head nut (4) and the long nut (31) is A step of causing the cone (7) to enter the inside of the expansion sleeve (6) in the hole (H) by rotating the member (2) and expanding the expansion portion (63) outward, and a fracture groove When the torque acting on the end side from (43) exceeds a predetermined value, the fracture groove (43) is broken to stop the rotation of the shaft member (2) and the anchoring tool (8) is continued. And turn the long nut (31) And a step of screwing along the second shaft portion (22) to closely fix the tip of the reinforcing member (3) to the surface around the hole (H).

  According to the present invention, a construction anchor is provided after bending or bending breakage does not occur in the vicinity of the surface of the anchor construction surface, and such a post-construction anchor can be constructed easily and efficiently. become.

It is a perspective view which decomposes | disassembles and shows each member which comprises a post-construction anchor. It is a perspective view which shows the state which assembled | attached each member of the post-construction anchor. It is a longitudinal cross-sectional view shown in the state which assembled | attached each member of the post-construction anchor. It is a figure which shows the structural example of an anchoring tool. It is a longitudinal cross-sectional view which shows the state with which the post-construction anchor was mounted | worn with the anchor application tool. It is a figure which shows the 1st procedure in the construction procedure of a post-construction anchor. It is a figure which shows the 2nd procedure in the construction procedure of a post-construction anchor. It is a figure which shows the 3rd procedure in the construction procedure of a post-construction anchor. It is a figure which shows the 4th procedure in the construction procedure of a post-construction anchor. It is a figure which shows the 5th procedure in the construction procedure of a post-construction anchor. It is a figure which shows the state which the construction of the post-construction anchor was completed. It is a figure which shows the state with which the suspension bolt was mounted | worn by the post-construction anchor. It is a figure which shows an example of the state by which the brace was attached to the post-construction anchor. It is a figure which shows the modification of a post-construction anchor. It is a figure which shows an example of the attachment aspect of the conventional brace.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, in each drawing referred to below, the same code | symbol is attached | subjected to the mutually common member, and the overlapping description about them is abbreviate | omitted.

  FIG. 1 is an exploded perspective view showing members constituting a post-construction anchor 1 according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a state where the members of the post-construction anchor 1 are assembled. FIG. 3 is a longitudinal sectional view showing a state in which each member of the post-construction anchor 1 is assembled.

  As shown in FIG. 1, the post-installation anchor 1 is configured to include a shaft member 2, a reinforcing member 3, a head nut 4, a washer 5, an expansion sleeve 6, and a cone nut 7. After this, the construction anchor 1 is inserted and attached into holes drilled in various types of housings such as concrete buildings and structures, and can be applied to any of ceiling slabs, wall slabs, and floor slabs. Especially suitable for installation on ceiling slabs.

  The shaft member 2 has a flange portion 23 at a predetermined position of the cylindrical rod-shaped body, and a first shaft portion 21 in which a first male screw 24 is formed on the one end (tip) 2a side from the flange portion 23, and the flange portion 23. And the second shaft portion 22 having the second male screw 25 formed on the other end 2b side. The first shaft portion 21 has, for example, a predetermined shaft diameter, and a first male screw 24 is formed on the distal end 2a side of the outer peripheral surface thereof. The second shaft portion 22 is coaxial with the first shaft portion 21 and has, for example, the same diameter as the first shaft portion 21 or a larger diameter than the first shaft portion 21, and the second shaft portion extends substantially over the entire outer peripheral surface. The male screw 25 is formed. The flange portion 23 has a disk shape with a diameter larger than that of the first shaft portion 21 and the second shaft portion 22, and forms a step between the first shaft portion 21 and the second shaft portion 22.

  The reinforcing member 3 is a member that is attached to the second shaft portion 22 of the shaft member 2, and has a long nut 31 in which a through screw hole 32 that engages with the second male screw 25 is formed, and the long nut. And a flange 33 provided at the tip of 31. The long nut 31 and the flange 33 are integrally formed with each other. The long nut 31 has a hexagonal columnar outer shape, and is screwed with the second male screw 25 over the entire inner side thereof as shown in FIG. The flange 33 is thicker than the long nut 31 and has a substantially cylindrical outer shape. The end surface 33a is formed flat, and a cylindrical space 34 having substantially the same diameter as the washer 5 is provided on the inner side thereof. doing. Such a reinforcing member 3 is attached to the second shaft portion 22 with the flange 33 facing the flange portion 23.

  The head nut 4 is fixed to the end portion 2 b of the second shaft portion 22 in a state where the reinforcing member 3 is screwed to the second shaft portion 22. The head nut 4 is formed in a hexagonal column shape whose outer shape is smaller than the long nut 31 of the reinforcing member 3, and is composed of a connecting portion 41 and a head portion 42, and between the connecting portion 41 and the head portion 42, It has the fracture | rupture groove | channel 43 which notched the outer peripheral surface cyclically | annularly and was formed more thinly than the other part. The fracture groove 43 is a groove that is formed at a predetermined position from the tip of the head 42 and separates the head 42 and the connecting portion 41. The breaking groove 43 is a groove that breaks when a torque exceeding a predetermined value is applied to the head portion 42 and separates the connecting portion 41 and the head portion 42.

  As shown in FIG. 3, a screw hole 48 that engages with the end 2 b of the second shaft portion 22 is formed at the end of the coupling portion 41 of the head nut 4. The head nut 4 is fixed to the end portion 2 b of the second shaft portion 22 by screwing the end portion 2 b of the second shaft portion 22 into the screw hole 48.

  In addition, a circular hole 46 having a predetermined inner diameter is formed at the end of the head 42 of the head nut 4, and a screw hole 47 is formed on the further back side of the circular hole 46. The screw hole 47 has the same diameter and the same axis as the screw hole 48 formed at the end of the connecting portion 41, and a partition wall 49 with the screw hole 48 is provided at the bottom. This partition wall 49 becomes the bottom of each screw hole 47, 48. A screw hole 47 formed on the further back side of the circular hole 46 is a screw hole for mounting a suspension bolt B (see FIG. 11) later. In the vicinity of the bottom portion of the screw hole 47, a window hole 44 penetrating the outer peripheral surface of the connecting portion 41 is formed. In addition, a resin deformable member 50 that is elastically deformed by mounting of the suspension bolt B is mounted in advance on the bottom of the screw hole 47. The deformable member 50 is formed of a strip-shaped resin member colored, for example, in red or blue, and the screw hole 47 in a state where the tip of the strip-shaped resin member bent in advance in an arc shape faces the entrance of the window hole 44. Is attached to the bottom.

  The circular hole 46 is formed deeper than the position where the breaking groove 43 is formed from the end face of the head portion 42, and the peripheral wall of the circular hole 46 is located inside the breaking groove 43. Therefore, the portion where the breaking groove 43 is formed becomes thinner than the other portions, and the torque at which the breaking groove 43 breaks is set to a predetermined value by forming the thickness to a value designed in advance. be able to.

  Further, a cap 45 is attached to the circular hole 46. The cap 45 is a resin cap colored in red or blue, for example, and is attached to the circular hole 46 in contact with the inner peripheral wall of the fracture groove 43. The cap 45 has a function as a mark indicating that the head 42 of the head nut 4 is not detached from the connecting portion 41, and is hung in the screw hole 47 in a state where the post-installed anchor 1 is not normally constructed. It has a function of preventing the bolt B from being attached. Furthermore, the cap 45 has a function as a dust-proof cap in order to seal the upper opening of the screw hole 47.

  On the other hand, the washer 5, the expansion sleeve 6 and the cone nut 7 are inserted into the first shaft portion 21 of the shaft member 2 in this order from the tip 2a. The washer 5 can be inserted into the first shaft portion 21 and has a ring shape that does not exceed the flange portion 23.

  The expansion sleeve 6 is configured as a substantially cylindrical body 61 that is inserted into the first shaft portion 21 of the shaft member 2, and a plurality of longitudinally divided grooves 62 are provided at the distal end portion of the substantially cylindrical body 61. A portion partitioned by the longitudinally split grooves 62 is an extended portion 63 that extends outward. In FIGS. 1 and 2, the outer peripheral surface of the extended portion 63 is a smooth surface. However, the present invention is not limited to this. For example, one or a plurality of ribs may be formed in the circumferential direction. Note that the number of the extension portions 63 provided at the distal end portion of the extension sleeve 6 is generally about three or four, but may be five or more. Such an extension sleeve 6 is inserted and attached to the first shaft portion 21 so that the tip portion provided with the extension portion 63 faces the tip end 2 a of the first shaft portion 21.

  The cone nut 7 is attached to the tip 2 a of the first shaft portion 21. The cone nut 7 has a frustoconical outer shape whose outer diameter gradually decreases along the axial direction of the first shaft portion 21, and the peripheral side surface thereof is a smooth tapered surface. The cone nut 7 has a through screw hole 71 that engages with the male screw 24 formed in the first shaft portion 21 at the center inner side. As shown in FIG. 3, the cone nut 7 is attached to the distal end 2 a of the first shaft portion 21 with the small-diameter end portion fitted into the distal end portion of the expansion sleeve 6. In such a mounted state, the large-diameter end portion of the cone nut 7 protrudes from the distal end portion of the expansion sleeve 6.

  The post-construction anchor 1 is constructed in a state where the respective members are assembled in advance as shown in FIGS. However, in the state before construction, it is preferable that the flange 33 of the reinforcing member 3 is at a position away from the flange portion 23 of the shaft member 2 by a predetermined distance or more.

  Next, FIG. 4 is a figure which shows the anchoring tool 8 used when constructing the post-installation anchor 1, (a) is the perspective view seen from diagonally upward, (b) is the perspective view seen from diagonally downward. (C) shows a longitudinal section. This anchor application tool 8 is a dedicated tool for constructing the post-construction anchor 1 in one step. As shown in FIG. 4, the anchoring tool 8 has an upper thick shaft portion 81 and a lower thin shaft portion 82. As shown in FIG. 4A, an anchor mounting hole 83 for inserting the head nut 4 mounted on the second shaft portion 22 of the post-installed anchor 1 and the reinforcing member 3 is formed on the end surface of the thick shaft portion 81. The Further, as shown in FIG. 4B, a tool mounting hole 86 for mounting a rotating shaft of an electric tool is formed on the end surface of the thin shaft portion 82, for example. As shown in FIG. 4C, the anchor mounting hole 83 is engaged with a first engaging portion 84 that engages with the outer peripheral surface of the long nut 31, and a second engaging portion with the outer peripheral surface of the head 42 in the head nut 4. The second engagement portion 85 is formed on the deeper side of the anchor mounting hole 83 than the first engagement portion 84. Therefore, the anchor mounting hole 83 has a first engagement portion 84 having a predetermined length, and the inner portion of the first engagement portion 84 is reduced in diameter to form a second engagement portion 85. On the other hand, the tool mounting hole 86 shown in FIG. 4 is for mounting, for example, a quadrangular columnar rotating shaft, and the anchoring tool 8 is detached from the tip of the rotating shaft when the rotating shaft is rotated using an electric tool. It is formed at a predetermined depth so as not to occur.

  FIG. 5 is a longitudinal sectional view showing a state in which the post-construction anchor 1 is mounted on the anchor application tool 8. When the post-construction anchor 1 is attached to the anchor application tool 8, the head nut 4 and the reinforcing member 3 attached to the second shaft portion 22 of the post-construction anchor 1 are inserted into the anchor attachment hole 83 as shown in FIG. The head 42 of the head nut 4 is engaged with the second engaging portion 85 and the long nut 31 of the reinforcing member 3 is engaged with the first engaging portion 84. That is, both the head 42 of the head nut 4 and the long nut 31 of the reinforcing member 3 are engaged with the anchoring tool 8.

  Next, the construction procedure of the post-construction anchor 1 will be described with reference to FIGS. First, after being attached to the anchor application tool 8, the construction anchor 1 is inserted into a hole H previously drilled in the ceiling slab S as shown in FIG. The ceiling slab S is formed, for example, by placing concrete or the like on a deck plate 90 in which valley portions 91 and mountain portions 92 are alternately provided at predetermined intervals, and the hole H is a mountain portion of the deck plate 90. At 92, the deck plate 90 is drilled. The cone nut 7 and the expansion sleeve 6 mounted on the first shaft portion 21 are inserted into the hole H, and the washer 5 and the flange 23 come into contact with the opening peripheral edge of the hole H for further entry. The first shaft portion 21 is inserted until the state is regulated. At this time, if the first shaft portion 21 of the construction anchor 1 is inserted into the hole H when the rotary shaft 9 of the electric tool is mounted in the tool mounting hole 86 of the anchoring tool 8 as shown in FIG. Work is smooth. Further, if a long rotating shaft longer than a general length rotating shaft is used as the rotating shaft 9 of the electric tool, the hole H provided in the ceiling slab S is located at a relatively high place. Even so, the worker can work while being positioned on the floor. In addition, the depth of the hole H is formed deeper than at least the length of the first shaft portion 21. The inner diameter of the hole H is slightly larger than the diameter of the large-diameter end portion of the cone nut 7, and when the post-installed anchor 1 is inserted into the hole H, the large-diameter end portion or the expansion sleeve 6 of the cone nut 7 is formed. The tip portion of the contact portion comes into contact with the inner wall of the hole H.

  When the first shaft portion 21 of the post-construction anchor 1 is inserted into the hole H, the electric tool is then activated, and the rotating shaft 9 is rotated in the clockwise direction R as shown in FIG. Thereby, the anchoring tool 8 comes to rotate in the clockwise direction R. At this time, since the head portion 42 of the head nut 4 is engaged with the second engaging portion 85 of the anchor tool 8, the head nut 4 rotates along with the rotation of the anchor tool 8. The shaft member 2 is rotated clockwise R. Since the large-diameter end of the cone nut 7 or the tip of the expansion sleeve 6 contacts the inner wall of the hole H, the cone nut 7 does not rotate with the shaft member 2 even when the shaft member 2 rotates. Therefore, the cone nut 7 advances by screwing the first shaft portion 21 toward the flange portion 23 as the shaft member 2 rotates. The cone nut 7 enters the inside of the expansion sleeve 6 from the distal end of the expansion sleeve 6 and expands the expansion portion 63 provided on the distal end side of the expansion sleeve 6 outward. Thereby, the expansion part 63 of the expansion sleeve 6 expands radially outward so as to press the inner wall of the hole H, and the post-construction anchor 1 is fixed to the hole H. At this time, since the long nut 31 of the reinforcing member 3 rotates integrally with the shaft member 2, the reinforcing member 3 does not move up and down along the second shaft portion 22.

  Then, as the cone nut 7 enters the inside of the expansion sleeve 6 as shown in FIG. 8, the resistance force (friction force) against the rotation of the shaft member 2 gradually increases, and the shaft member 2 is rotated. Necessary torque increases. When the construction anchor 1 is fixed in the hole H with sufficient strength, the torque when the anchoring tool 8 rotates the shaft member 2 exceeds a predetermined value. This torque acts on the breaking groove 43 of the head nut 4. Therefore, as shown in enlarged view A in FIG. 8, torque exceeding a predetermined value breaks the fracture groove 43 and separates the connecting portion 41 and the head portion 42 of the head nut 4. As a result, the rotational force acting on the anchoring tool 8 does not act on the shaft member 2, so that the rotation of the shaft member 2 is stopped and the head 42 separated from the connecting portion 41 rotates together with the anchoring tool 8. Become.

  On the other hand, since the long nut 31 of the reinforcing member 3 is engaged with the first engagement portion 84 of the anchoring tool 8, even after the fracture groove 43 is broken, as shown in FIG. When the rotation in the rotation direction R is continued, the long nut 31 is screwed along the second shaft portion 22 toward the flange portion 23 with the rotation of the anchoring tool 8. When the rotation of the rotating shaft 9 is further continued, the end surface of the flange 33 of the reinforcing member 3 presses the surface of the peak portion 92 of the deck plate 90 and comes into close contact as shown in FIG. At this time, the washer 5 and the flange 23 are accommodated inside the cylindrical space 34 formed in the flange 33, and the end face of the flange 33 is in close contact with the display on the deck plate 90 substantially uniformly. When such a close contact state is obtained, the construction of the post-construction anchor 1 is completed. When the rotary shaft 9 is pulled downward, the anchoring tool 8 can be detached from the post-construction anchor 1 together with the rotary shaft 9. At this time, the anchor application tool 8 is detached from the post-construction anchor 1 while the head 42 separated from the head nut 4 remains in the anchor mounting hole 83 together with the cap 45. As a result, the post-construction anchor 1 is firmly attached to the ceiling slab S at the peak portion 92 of the deck plate 90 as shown in FIG. Since such post-construction anchor 1 can be inserted into the hole H, the post-construction anchor 1 with respect to the hole H, and the reinforcement member 3 can be attached in one step as a series of operations. There is an advantage that the construction is completed easily and efficiently. Further, since the worker can work from the floor surface, it is not necessary to assemble a scaffold and the work can be performed safely.

  Here, the axial length of the reinforcing member 3 is formed to be substantially the same as or longer than the height difference (step) h between the valley portion 91 and the peak portion 92 of the deck plate 90. Therefore, the reinforcing member 3 can reinforce the periphery of the second shaft portion 22 that hangs down from the ceiling slab S in a narrow space sandwiched between the valley portions 91, and can increase the rigidity.

  As shown in FIG. 11, when the post-construction anchor 1 is attached to the ceiling slab S, the second shaft portion 22 is exposed between the reinforcing member 3 and the head nut 4. The portion where the second shaft portion 22 is exposed has a predetermined length in the axial direction, and a metal fitting 110 for fixing a brace 120 described later can be attached.

  When the post-construction anchor 1 is attached to the ceiling slab S, as shown in FIG. 11, the suspension bolt B is attached to the screw hole 47 that the head 42 is detached and opens downward as shown in FIG. Since the cap 45 removed together with the head 42 contacts the inner wall of the breaking groove 43 and presses the breaking groove 43 from the inside, when the breaking groove 43 breaks, the breaking protrusion (burr) opens the screw hole 47. Prevents protruding toward the inside of the circle. Therefore, when the suspension bolt B is attached to the screw hole 47, the breaking projection does not get in the way, and the suspension bolt B can be smoothly attached to the screw hole 47. Further, when the post-construction anchor 1 is not fixed to the hole H with sufficient strength, the head 42 of the head nut 4 is not detached, so that the suspension bolt B is attached to the screw hole 47 in such a state. Even if the cap 45 restricts the entry of the suspension bolt B, it is possible to prevent the suspension bolt B from being mounted in a state where the suspension bolt is not properly constructed. Furthermore, since the cap 45 is colored red or blue, the operator can confirm whether or not the post-construction anchor 1 is well constructed by visual observation from the floor surface.

  When the suspension bolt B is attached to the screw hole 47, the tip of the suspension bolt B deforms the deformable member 50 provided in advance at the bottom of the screw hole 47. That is, since the tip of the suspension bolt B presses and deforms the deformable member 50, the deformable member 50 protrudes from the window hole 44 with the deformation. FIG. 12 shows a state in which the mounting of the suspension bolt B to the screw hole 47 is normally completed. As shown in FIG. 12, when the tip of the suspension bolt B reaches the back end of the screw hole 47 and the attachment of the suspension bolt B is normally completed, the tip of the deformation member 50 is opened from the window hole 44 that opens on the side surface of the connecting portion 41. Is in a state protruding by a predetermined length. Therefore, the operator who performs the mounting work of the suspension bolt B from the floor surface visually confirms that the tip of the deformable member 50 appears for a predetermined length from the window hole 44 on the side surface of the connecting portion 41, thereby Can be prevented from being poorly constructed. Further, since the deformable member 50 is colored red or blue, there is an advantage that it is easy for an operator to confirm whether or not the tip of the deformable member 50 has appeared from the window hole 44 of the connecting portion 41.

  When the mounting of the suspension bolt B is normally completed, various ceiling structures such as a ceiling panel, an air conditioner, a lighting fixture, and various pipes are connected to the lower end portion of the suspension bolt B. After that, when the brace 120 serving as the diagonal reinforcing material is attached to the suspension bolt B, the brace 120 is attached to the second shaft portion 22 between the reinforcing member 3 and the connecting portion 41. FIG. 13 is a diagram illustrating an example of a state in which the brace 120 is attached to the post-construction anchor 1. As shown in FIG. 13, the connecting fitting 110 for fixing the brace 120 is attached to the uppermost portion of the second shaft portion 22 extending from the lower end of the reinforcing member 3. The connection fitting 110 has a screw portion 111 that is screwed with the tip of the brace 120. Then, in a state where the connecting metal fitting 110 is attached directly below the reinforcing member 3, the brace 120 is screwed into the screw portion 111 and the tip is strongly pressed against the second shaft portion 22, so that the brace 120 is attached to the post-construction anchor 1. The second shaft portion 22 is firmly connected.

  By attaching the connection fitting 110 directly below the reinforcing member 3 in this way, the connection fitting 110 and the brace 120 can be attached without causing interference with the valley portion 91 of the deck plate 90, and as in the prior art. An unreinforced gap G (see FIG. 15) of the second shaft portion 22 does not occur between the metal fitting 110 and the ceiling slab S. Therefore, for example, even when excessive lateral stress acts on the second shaft portion 22 from the brace 120 when a large-scale earthquake occurs, the reinforcing member 3 vibrates the second shaft portion 22 near the surface of the ceiling slab S. Since it suppresses, the 2nd axial part 22 does not bend, but exhibits a sufficient seismic control function as a large-scale earthquake countermeasure.

  As described above, the post-installed anchor 1 in the present embodiment includes the first shaft portion 21 in which the first male screw 24 is formed on the distal end side from the predetermined position of the rod-shaped body, and the second shaft on the other end side from the predetermined position. The shaft member 2 having the second shaft portion 22 formed with the male screw 25 and the substantially shaft-like shape that can be inserted into the first shaft portion 21 are configured to extend outwardly by the longitudinal groove 62 on the distal end side. An expansion sleeve 6 having an expansion portion 63 formed on the outer periphery of the shaft member 2, and an outer diameter of the expansion sleeve 6 that gradually decreases along the axial direction of the shaft member 2. The small diameter end portion is fitted into the distal end portion of the expansion sleeve 6, and is screwed into the cone nut 7 attached to the distal end of the first shaft portion 21 and the second male screw 25. Reinforcing member 3 provided with a flange 33 having a thicker shaft diameter on the distal end side of long nut 31 having a larger diameter A head nut 4 fixed to the end 2b of the second shaft portion 22 in a state in which the reinforcing member 3 is screwed and attached to the second male screw 25, and having an annular fracture groove 43 at a predetermined position on the outer peripheral surface; . Then, the head nut 4 rotates the shaft member 2 with torque acting on the head portion 42 on the end side of the fracture groove 43, thereby causing the cone nut 7 to enter the inside of the expansion sleeve 6 and the expansion portion 63. When the torque applied to the head portion 42 on the end side of the breaking groove 43 exceeds a predetermined value, the breaking groove 43 is broken and the rotation of the shaft member 2 is stopped. According to the post-construction anchor 1 having such a configuration, by applying the rotational force to both the head 42 of the head nut 4 and the long nut 31 of the reinforcing member 3 at the same time, And the reinforcement of the second shaft portion 22 can be performed in one step as a series of operations, so that it is possible to easily and efficiently construct a structure in which the upper part is reinforced than the connection position of the brace 120. is there.

  Moreover, when constructing the post-construction anchor 1 in the present embodiment, the above-described anchor tool 8 can be suitably used. That is, the anchor application tool 8 described above engages with both the long nut 31 of the reinforcing member 3 and the head portion 42 on the end side of the breaking groove 43 of the head nut 4. 31 and the head 42 of the head nut 4 can be simultaneously applied with a rotational force, so that the construction of the anchor and the reinforcement of the second shaft portion 22 are performed in one step as a series of operations. It is a suitable tool that can be used.

  Although one embodiment related to the present invention has been described above, the present invention is not limited to the specific configuration example of the above-described embodiment, and various modifications can be applied.

  For example, in the said embodiment, the form which fixes the head nut 4 to the edge part 2b of the 2nd axial part 22 by screwing the edge part 2b of the 2nd axial part 22 to the bottom part of the screw hole 48 of the head nut 4 is illustrated. However, it is not limited to this. For example, when the screw hole 48 communicates with the screw hole 47 and the screw hole 48 does not have a bottom portion, the end 2b of the second shaft portion 22 is inserted to a predetermined depth with respect to the screw hole 48, and the head You may make it fix the head nut 4 to the edge part 2b of the 2nd axial part 22 by pressing the outer peripheral surface of the nut 4 and crimping. Moreover, the form which fixes the head nut 4 to the edge part 2b of the 2nd axial part 22 may not be based on a screw. For example, the head nut 4 may be fixed to the end portion 2b of the second shaft portion 22 by welding the head nut 4 to the end portion 2b of the second shaft portion 22, or by other methods. It may be fixed.

  Further, when the post-construction anchor 1 described above is attached to the ceiling slab S, the screw hole 47 for attaching the suspension bolt B opens downward, and the suspension bolt B is installed by screwing the suspension bolt B into the screw hole 47. Was illustrated. However, depending on the location of the post-installed anchor 1, it may be desirable to leave a bolt for attaching a nut or the like instead of forming the screw hole 47 after the anchor is installed. As an anchor installed at such a construction location, for example, the configuration of post-construction anchors 1a and 1b shown in FIG. 14 (a) or (b) may be adopted.

  In the post-construction anchor 1a shown in FIG. 14 (a), the head nut 4 is screwed to the end 2b of the second shaft portion 22, and a torque exceeding a predetermined value is applied to the head nut 4. In this case, an annular break groove 43 that breaks in some cases is formed on the outer peripheral surface of the second shaft portion 22 at a predetermined position near the head nut 4. Such a post-construction anchor 1a is constructed in the hole H in the same manner as described above. When the torque acting on the head nut 4 exceeds a predetermined value during the construction process, the fracture groove 43 formed in the second shaft portion 22 is broken, and the second shaft portion 22 and the head nut 4 are separated. Therefore, since the second shaft portion 22 is in a suspended state after the anchor construction, a nut or the like can be attached to the second shaft portion 22.

  Further, the post-construction anchor 1b shown in FIG. 14B is one in which a head nut 4 having a diameter smaller than that of the second shaft portion 22 is integrally formed with the end portion 2b of the second shaft portion 22. After this, the construction anchor 1b also has an annular fracture groove 43 that is broken when a torque exceeding a predetermined value is applied to the head nut 4 on the outer peripheral surface of the second shaft portion 22 at a predetermined position in the vicinity of the head nut 4. It is the formed structure. In such a configuration, the reinforcing member 3 can be inserted and mounted from the head nut 4 thinner than the second shaft portion 22. Further, in the process of installing the post-construction anchor 1b in the hole H in the same manner as described above, when the torque acting on the head nut 4 exceeds a predetermined value, the fracture groove 43 formed in the second shaft portion 22 is fractured, The biaxial portion 22 and the head nut 4 are separated. Therefore, since the second shaft portion 22 is in a suspended state after the anchor construction, a nut or the like can be attached to the second shaft portion 22.

  Therefore, when it is desired to leave a bolt for attaching a nut or the like after anchor construction, post-construction anchors 1a and 1b as shown in FIG. 14 (a) or (b) may be employed.

  Next, the post-construction anchors 1, 1 a, 1 b described above are not only for the deck plate 90 having the valley portions 91 and the mountain portions 92, but also for the deck plates having ribs protruding at a predetermined length on the lower surface at a predetermined pitch. However, it can be used satisfactorily.

  Further, the post-construction anchors 1, 1a, 1b described above can be applied to the ceiling slab S in which the deck plate 90 does not exist on the lower surface. That is, as a method of forming the ceiling slab S, the deck plate 90 is disposed as described above, and the formwork is formed at the position where the ceiling slab S is formed in addition to the method of forming the ceiling slab S on the deck plate 90. There is a method of removing the formwork after the ceiling slab S is formed. When the ceiling slab S is formed using the mold, the deck plate 90 does not exist on the lower surface of the ceiling slab S that is a construction target of the post-construction anchor 1. And when piping etc. are provided in the lower surface vicinity of the ceiling slab S, since the brace 120 cannot be connected to the lower surface vicinity position of the ceiling slab S, the after-mentioned construction anchor 1 is attached to the ceiling slab S. By directly performing the construction, the second shaft portion 22 can be favorably reinforced between the lower surface of the ceiling slab S and the connection position of the brace 120.

  In addition, the post-construction anchors 1, 1 a, and 1 b described above are provided with the flange portion 23 at a predetermined position of the shaft member 2, but when the first shaft portion 21 is thinner than the second shaft portion 22, for example, Instead of 23, a simple step may be provided.

  Moreover, in the said embodiment, although the case where the post-construction anchors 1, 1a, 1b were mainly constructed to the ceiling slab S was illustrated, the anchor construction surface used as the construction object of the post-construction anchors 1, 1a, 1b mentioned above is not necessarily a ceiling. The present invention is not limited to the slab S, and can be suitably used for a slab surface (an anchor construction surface) other than the ceiling such as a wall surface slab or a floor slab.

1, 1a, 1b Post-installed anchor 2 Shaft member 3 Reinforcement member 4 Head nut 6 Expansion sleeve 7 Cone nut 8 Anchor application tool 21 First shaft portion 22 Second shaft portion 31 Long nut 33 Flange 41 Connecting portion 42 Head portion 43 Breaking groove 45 Cap

Claims (8)

A shaft member having a first shaft portion in which a first male screw is formed on the distal end side from a predetermined position of the rod-shaped body, and a second shaft portion in which a second male screw is formed on the other end side from the predetermined position;
An expansion sleeve having a substantially cylindrical shape that can be inserted into the first shaft portion, and having an expansion portion formed on the distal end side so as to expand outward by a longitudinal groove;
In a state where the outer diameter is gradually reduced along the axial direction of the shaft member, a through screw hole is formed on the inner side to be screwed with the first male screw, and the small diameter end portion is fitted into the distal end portion of the expansion sleeve. A cone nut attached to the tip of the first shaft portion;
A reinforcing member comprising a long nut that is screwed into the second male screw;
A head nut fixed to an end of the second shaft portion in a state where the reinforcing member is screwed and attached to the second male screw;
And breaking an annular groove which is made form a predetermined position of the outer peripheral surface of said head nut,
With
The head nut is formed by the torque acting on the end side of the breaking groove in a state where the first shaft portion to which the expansion sleeve and the cone nut are attached is inserted into a hole formed on an anchor construction surface. When the member is rotated, the cone nut enters the inside of the expansion sleeve to expand the expansion portion outward, and when the torque acting on the end side of the breaking groove exceeds a predetermined value, A post-construction anchor characterized by breaking the fracture groove to stop the rotation of the shaft member. A shaft member having a first shaft portion in which a first male screw is formed on the distal end side from a predetermined position of the rod-shaped body, and a second shaft portion in which a second male screw is formed on the other end side from the predetermined position;
An expansion sleeve having a substantially cylindrical shape that can be inserted into the first shaft portion, and having an expansion portion formed on the distal end side so as to expand outward by a longitudinal groove;
In a state where the outer diameter is gradually reduced along the axial direction of the shaft member, a through screw hole is formed on the inner side to be screwed with the first male screw, and the small diameter end portion is fitted into the distal end portion of the expansion sleeve. A cone nut attached to the tip of the first shaft portion;
A reinforcing member comprising a long nut that is screwed into the second male screw;
A head nut fixed to an end of the second shaft portion in a state where the reinforcing member is screwed and attached to the second male screw;
An annular fracture groove formed at a predetermined position on the outer peripheral surface of the head nut, or at a predetermined position near the head nut on the outer peripheral surface of the second shaft portion;
With
The head nut is formed by the torque acting on the end side of the breaking groove in a state where the first shaft portion to which the expansion sleeve and the cone nut are attached is inserted into a hole formed on an anchor construction surface. When the member is rotated, the cone nut enters the inside of the expansion sleeve to expand the expansion portion outward, and when the torque acting on the end side of the breaking groove exceeds a predetermined value, Breaking the breaking groove to stop the rotation of the shaft member,
The reinforcing member, the characteristics and to the luer and construction anchor that by the torque acting on the long nut to advance toward the distal end of the long nut to the anchor construction surface after the breaking groove is broken. Second shaft portion prior SL, when the tip of the reinforcing member has progressed to the anchor construction surface substantially the same position, length can be attached to bracket for fixing the brace between the reinforcing member and the head nut The post-construction anchor according to claim 1, having a thickness.   One end of the head nut is fixed to the end of the second shaft portion by screwing with the second male screw formed at the end of the second shaft portion, and the breaking groove is formed at the other end. The post-construction anchor according to claim 3, further comprising a screw hole formed deeper than a position where the is formed. The head nut has a cap attached to the screw hole;
The post-construction anchor according to claim 4, wherein the cap is detached from the head nut together with an end portion side of the head nut when the fracture groove is broken.   The post-construction anchor according to any one of claims 1 to 5, wherein the reinforcing member has a flange having a shaft diameter larger than that of the long nut at a tip of the long nut. An anchoring tool for constructing the post-construction anchor according to any one of claims 1 to 6,
Engaging both the long nut and the head nut of the reinforcing member, and simultaneously applying a rotational force to both the long nut and the head nut of the reinforcing member. Anchor tool to be used. A construction method for constructing a post-construction anchor according to any one of claims 1 to 6,
Inserting the first shaft portion of the shaft member into a pre-drilled hole in a state where the expansion sleeve and the cone nut are mounted on the first shaft portion;
Attaching an anchoring tool that engages both the head nut fixed to the end of the second shaft portion and the long nut;
By rotating the anchor tool in a predetermined direction, the shaft member is rotated through the head nut, and the long nut is rotated with the shaft member, whereby the cone nut is rotated in the hole. Entering the inside of the expansion sleeve to expand the expansion portion outward;
When the torque acting on the end side of the breaking groove exceeds a predetermined value, the breaking groove is broken to stop the rotation of the shaft member, and the anchoring tool is continuously rotated to cause the long A step of screwing the nut along the second shaft portion, and fixing the tip of the reinforcing member to the surface around the hole; and
The construction method characterized by having.

Images