JP2016017527A - Anchor bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate excessive fastening or lack of fastening of an anchor bolt.SOLUTION: An open leg part 20 is constituted in which bent pieces 22 corresponding to each of pieces of a nut 10 are upright at a right angle from the rear end surface of the nut 10. The rear end side of the bent pieces is received at the extremity end of a guide cylinder 30 having a substantial same size diameter of the outer circumference of the nut. The guide cylinder is provided with an open hole 31 along the axis core, and its outer circumference is provided with a plurality of stoppers protruded toward an outer circumference in a radial direction and extended in an axial direction. Further, a prescribed length of a stopper 33 is extended at an axial extremity end at an inner diameter side than a position where the rear end of the bent piece of the guide cylinder is received. A male thread at the extremity end is engaged in thread with the nut from the extremity end of the guide cylinder through the open hole of the bolt so as to constitute the anchor bolt. Fastening of the bolt causes the extremity end of the stopper to abut against the rear end surface of the nut, resulting in that its more fastening cannot be carried out.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an anchor bolt, and more particularly to an anchor bolt for ALC.

  A method of fixing anchor bolts to an ALC board and fixing equipment to the floor or wall of the ALC is widely adopted.

  FIG. 4 shows a state where anchor bolts are fixed to the ALC board wall of the building.

  First, the sleeve 1 described below is configured. That is, a bent piece 22 composed of six pieces corresponding to each hexagonal piece that matches the shape of the nut 10 having a predetermined size is formed at the tip (nut side) of the six bent pieces 22 with a hexagonal connecting portion 21. Connected to form a hexagonal column. The hexagonal column is fixed to one surface of the nut 10 with the same axis as the previous nut 10 using the connecting portion 21. The rear end of the bent piece 22 is received by the front end of the guide tube 30 to form the sleeve 1.

  The guide cylinder 30 has a diameter substantially the same as the outer periphery of the nut 10, is provided with a through-hole 31 into which the bolt 2 corresponding to the nut 10 is fitted in the axial direction, and further has a plurality of protrusions projecting outward in the radial direction. A detent 32 is provided in the axial direction.

  The central portion of each bent piece 22 fixed to the nut 10 is provided with a constriction 23 so that it is easily bent outward (in a direction perpendicular to the shaft) when pressure from the axial direction is applied. When each bending piece 22 is locked to the tip of the guide cylinder 30, the axis of the through hole 31 of the guide cylinder 30 and the axis of the nut 10 are aligned.

  The bolt 2 is inserted into the sleeve 1 formed in this way from the rear end side of the guide tube 30 and is screwed to the nut 10 at the tip to form an anchor bolt.

  As shown in FIG. 4, the guide cylinder 30 is driven into the through hole 50 opened in the ALC or the like so that the anti-rotation 32 maintains a predetermined resistance, as shown in FIG. 4. When the bolt 2 is turned strongly, the central portion of the bent piece 22 is opened on the back side of the ALC as shown in FIG. 4 by the tightening force of the bolt 2 and the nut, and the bolt 2 is fixed to the ALC. It will be.

  The anchor bolt 2 fixed as described above is used to install equipment on the building or to fix the scaffolding of the building under construction.

  For the above prior art, see also Japanese Utility Model Laid-Open No. 57-080709.

Shokai 57-080709

  An appropriate strength can be obtained by opening the leg portion constituted by the bent piece 22 to an appropriate degree. As shown in FIG. 4, if it is tightened too much, the strength of the bent piece will decrease, and conversely, if the degree of tightening is weak (open legs are small), the tensile strength in the axial direction will decrease.

  In particular, when a scaffold of a building under construction is supported on a wall, it is necessary to ensure sufficient strength. As shown in FIG. 4, the anchor bolt is inserted into the through hole 50, and the open leg portion is ALC. Adopt a structure that opens on the back of the board. At this time, since the tightening work can be performed with almost no resistance at the initial stage of tightening, the operator cannot confirm how much the bent piece is open. It will not be possible.

  The present invention has been proposed in view of the above-described conventional circumstances, and an object of the present invention is to prevent the anchor bolt from being excessively or insufficiently tightened.

  The sleeve described below is configured.

  That is, a bent piece corresponding to each piece of the nut is raised at a right angle from the front end surface of the nut to constitute an open leg portion. The rear end side of the bent piece is received by the front end of a guide cylinder having a diameter substantially the same as the outer circumference of the nut. The guide tube is provided with a through-hole along the axial center, and a plurality of detents are provided on the outer periphery of the guide tube so as to protrude radially outward and extend in the axial direction.

  Further, a stopper extends a predetermined length on the inner end side from the position where the rear end of the bent piece of the guide cylinder is received, on the front end side in the axial direction.

  From the rear end side of the guide cylinder to the sleeve, a bolt is screwed into a nut through a through hole and an anchor bolt is formed.

  The anchor bolt is inserted into a through-hole provided in the ALC or the like, and the sleeve itself does not rotate even if the bolt is turned by the resistance of the rotation prevention. When the bolt is tightened in this state, when the bent piece constituting the open leg portion is opened to a state where appropriate strength can be maintained on the back surface of the ALC, the tip end of the stopper and the rear end surface of the nut come into contact with each other. No further tightening is possible. Accordingly, it is possible to prevent a decrease in strength due to excessive or insufficient tightening.

The perspective view which shows the whole this invention. The figure which shows the sleeve of this invention. The figure which shows the usage example of this invention. The figure which shows a prior art.

  As shown in FIG. 2, six bent pieces 22 corresponding to each hexagonal piece matching the shape of the nut 10 having a predetermined size are formed at the tip (nut side) of the six bent pieces 22. It is connected by a rectangular connecting portion 21 and formed into a hexagonal column. Using the connecting portion 21 of each bent piece 22 formed in the hexagonal column, the nut 10 is inserted into the insertion portion that is axially raised on the surface (tip) of the nut 10 (crimped), The bent piece 22 is fixed in the axial direction of the nut 10. At this time, each side of the nut 10 and each side of the hexagonal column formed by the bent piece 22 are matched to form a hexagonal column body as a whole.

  As described above, the tip of each bent piece 22 is fixed to the nut, and the rear end of the bent piece 22 is locked to the tip of the guide tube 30 (the base end portion of the stopper) described below.

  The bending piece 22 is an open leg that bends outward and opens as an umbrella as a whole when pressure is applied to both ends in the axial direction (the axial direction of the nut and also the axial direction of the guide cylinder described above). The unit 20 is configured. For this purpose, a constriction 23 is provided at the center of each bent piece 22, and the constriction 23 spreads in an umbrella shape in the radial direction in response to the axial force.

  The guide cylinder 30 has a diameter substantially the same as the outer periphery of the nut 10 and is provided with a through hole 31 into which the bolt 2 corresponding to the nut 10 is fitted in the axial direction. Furthermore, a plurality of detents 32 protruding in the radial direction are provided in the axial direction on the outer periphery in the radial direction of the guide cylinder 30.

  The rear end of the bent piece 22 is the tip of the guide tube 30 (the base end portion of the stopper) so that the shaft core of the nut 10 and the shaft core of the through hole 31 formed in the guide tube 30 coincide with each other. It is accepted. Furthermore, a stopper 33 extending in the axial direction X in a predetermined length is formed on the radially inner side of the engaging portion that receives the bent piece 22 of the guide tube 30. The meaning of the predetermined length will be described later. Of course, the through hole 31 also penetrates the center of the stopper 33.

  The bolt 2 is inserted into the sleeve 1 formed in this way from the rear end side of the guide tube 30 and is screwed to the nut 10 at the tip to form an anchor bolt.

  As will be described later, this anchor bolt can be inserted into the outer wall of a building under construction and used for fixing a scaffold. At this time, the bolt 2 has a large diameter portion 2a up to the vicinity of the center in the axial direction, from which the tip portion becomes a small diameter portion 2b coinciding with the through hole 31 of the sleeve 1, and the nut 10 has a predetermined length at the tip. A male screw 2c to be screwed is engraved. Therefore, the sleeve 1 into which the bolt 2 is inserted is received by the step between the large diameter portion 2a and the small diameter portion 2b of the bolt 2, and corresponds to the thickness of the ALC plate as described below. It has a configuration.

  FIG. 3 shows a state in which the anchor bolt is passed through and fixed to the ALC plate 100.

  As in the prior art, the ALC 100 is provided with a through hole 50. The bolt 2 is inserted into the through-hole 50 in a state where the bolt 2 is inserted into the sleeve 1 (the nut 10 is screwed to the male screw at the tip). At this time, the through hole 50 has a size such that the rotation of the sleeve 1 is locked by the detent 32 of the guide tube 30. When the bolt 2 is tightened in this state, the bent piece 22 is bent outward by the tightening force of the nut 10 and the bolt 2, and the open leg portion 20 opens in an umbrella shape, and the leg portion is the back surface of the ALC plate 100. Abut. As the tightening progresses, the tip of the stopper 33 comes into contact with the rear end surface of the nut 10, and further tightening cannot be performed. Here, the length of the stopper 33 is determined so that the leg of the bent piece 22 does not become too large, and conversely, the leg is not short. However, since the axial position of the rotation stopper is regulated by the large diameter portion, it is necessary to consider the length of the large diameter portion. As described above, the anchor bolt is fixed to the ALC wall, and the scaffold is fixed using the anchor bolt.

  In the above, a configuration is adopted in which the large-diameter portion 2a and the small-diameter portion 2b are provided and the axial movement of the sleeve 1 is restricted by the step portion so that the bolt 2 with the sleeve 1 can be easily driven into the through hole 50. Yes. However, since the movement of the sleeve 1 in the axial direction is originally restricted by the nut 10 and the male screw 2 c, a general-purpose bolt can be used as the bolt 2.

  With the above configuration, the bolt is not over-tightened or under-tightened, and is fixed to the ALC with sufficient strength as an anchor bolt. Also, when used for fixing scaffolds, the bolts can be removed and reused after the work is completed (the sleeve is embedded), but the bolts are not overtightened, making it easy to remove the bolts. .

  As a configuration for preventing overtightening of the bolt, it is also conceivable to set the length of the male screw portion engraved at the tip of the bolt to an appropriate length. However, when the bolt is excessively tightened with this configuration, an excessive force is required when the bolt is removed, or the bolt cannot be removed and the bolt may not be reused. In addition, a configuration such as slightly increasing the diameter of the bolt itself may be considered corresponding to the position corresponding to the tip of the stopper when the bolt is tightened. The bolt cannot be used for the purpose of use and lacks convenience.

  As described above, according to the present invention, since the anchor bolt sleeve is opened within a range that does not reduce the strength, even when the strength is required, such as the construction of a scaffold, a sufficient strength is ensured. It is essential to ensure safety at the construction site.

1 · · Sleeve 2 · · Bolt 10 · · Nut 20 · · Opening leg portion 21 · · Connection portion 22 · · Bending piece · · · Constriction 30 · · Guide tube 31 · · Through hole 33 · · Stopper 50 · · Through Hole 100 ... ALC plate

Claims (2)

Consisting of nuts, bolts and sleeves,
The sleeve is raised at a right angle from the front end surface of the nut, and an open leg portion composed of a bent piece corresponding to each piece of the nut;
A guide tube having a diameter substantially the same as the outer periphery of the nut, including a bolt insertion hole having a rear end of each bent piece at the tip and having the same axis as that of the nut,
A plurality of detents protruding in the radial outer periphery and extending in the axial direction on the outer periphery of the guide tube;
The inner diameter side from the position where the rear end of the bent piece of the guide tube is received includes a stopper extending a predetermined length on the front end side in the axial direction,
The anchor bolt, wherein the bolt is inserted from a rear end side of the guide tube, and a tip is screwed to a nut through the through hole. The bolt has a large-diameter portion up to the vicinity of the center in the axial direction, from which the tip portion becomes a small-diameter portion having a diameter that matches the through hole, and a male screw to which the nut is screwed to a predetermined length of the tip. The anchor bolt according to claim 1, wherein the sleeve is cut and received by the step between the large diameter portion and the small diameter portion.

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