JP6345983B2 - Extended post-installed anchor bolt - Google Patents

Description

  The present invention relates to an extended post-installed anchor bolt.

  Expanded post-installed anchor bolts are often used to fix partitions, equipment and the like to existing concrete floors, and are used by driving into prepared holes in concrete floors. The expansion type post-installed anchor bolts are designed to be prevented from coming out by exerting a wedge action by expanding the lower end of the hollow bolt body with the pins as the pins are driven (for example, Patent Document 1).

Japanese Patent Laid-Open No. 10-24340

  By the way, although the installation location of the equipment is generally fixed, there is a possibility that it will be moved due to a layout change or the like, and in the partition, the transfer has become normal. At the transfer destination, the anchor bolt is driven and fixed to the floor in the newly drilled pilot hole, but the used anchor bolt remains on the transfer source floor. In order to remove the remaining anchor bolt from the floor, it is necessary to lift the surrounding floor surface, which is complicated. For this reason, a new anchor bolt that can cope with removal from the floor after driving and fixing has been requested. In addition, it is also required to reduce the manufacturing cost of anchor bolts.

  In order to achieve at least a part of the problems described above, the present invention can be implemented as the following forms.

  (1) According to one aspect of the present invention, an extended post-installed anchor bolt is provided. This extended post-installed anchor bolt is an extended post-installed anchor bolt that is mounted and fixed in a pilot hole, and is a hollow bolt body that enters the pilot hole, and a lower end of the bolt main body that is set inside the bolt main body And a driving pin to be driven to the side. And the said bolt main body is located in the said bolt main body lower end side, the expansion part which can be expanded by the slit along a bolt main body longitudinal direction, and the remaining bolt main body part except this expansion part, The said expansion part is said residual bolt main body The driving pin is provided with a smaller inner diameter than the driving portion, and the driving pin is positioned on the driving side, and the expansion portion is positioned on the side of the expansion portion and enters the expansion portion. A wedge inducing portion that expands in the pilot hole and exerts a wedge action, and is connected by a connecting portion having a smaller diameter than the wedge inducing portion and the driving portion and a smaller diameter than the inner diameter of the expanding portion, The remaining bolt body portion of the bolt body includes a flange having a diameter larger than the opening diameter of the pilot hole in the opening on the driving side, and the connecting portion of the driving pin is arranged along the longitudinal direction of the bolt body. It is longer than the length of the extension.

  The expanded post-installed anchor bolt of the above form exhibits a wedge action when the extended portion of the bolt body is expanded by the pilot hole wedge induction portion at the pilot hole. In this state, the bolt body flange is covered by the flange body flange. Fix the fixed object to the floor surface where the pilot hole has been formed. And when the driving pin is further driven, the extended post-installed anchor bolt of the above-mentioned form pulls out the wedge inducing portion from the extended portion of the bolt body to the inner side of the pilot hole, and the extended portion has a smaller diameter than the wedge inducing portion. In addition, since the connecting portion having a smaller diameter than the inner diameter of the expansion portion is positioned, the wedge action disappears. As a result, according to the extended post-installed anchor bolt of the above form, by lifting the flange from the floor surface after the pin has been driven until the wedge inducing portion comes out of the extended portion of the bolt body to the deep hole deep side, It can be removed from the pilot hole and can be removed from the floor after being fixed.

  (2) In the extended post-installed anchor bolt of the above form, the driving pin may have a tapered tip at the wedge inducing portion. In this way, the wedge-inducing portion can be guided to the extended portion at the tip of the tapered wedge-inducing portion, so that the pin can be driven easily.

  (3) In the extended post-installed anchor bolt of any of the above forms, in the state where the driving portion is driven until the driving pin is flush with the flange of the remaining bolt main body portion, You may make it the said wedge induction part enter into the said expansion part, and you may make it stop in the position which exhibits the said wedge effect | action. By so doing, the driving portion of the driving pin does not protrude from the flange in the driving fixed state, so that it is difficult to give an uncomfortable feeling.

  The present invention can be realized in various forms. For example, the present invention can be realized in the form of a fixing method for equipment or the like using an extended post-installed anchor bolt.

It is explanatory drawing which shows the anchor bolt 10 of embodiment of this invention with a perspective view with each part which comprises this. It is explanatory drawing which shows the anchor bolt 10 by sectional view with each part which comprises this. FIG. 4 is an explanatory view showing a first half of fixing a partition leg Pk to a floor surface F with an anchor bolt 10. FIG. 4 is an explanatory view showing a state in the latter half of fixing the partition leg Pk to the floor surface F with the anchor bolt 10. It is explanatory drawing which shows the mode of extraction of the anchor bolt 10 after fixation. It is explanatory drawing which shows the 1st and 2nd procedure which obtains the volt | bolt main body 20. FIG. It is explanatory drawing which shows the 3rd procedure which obtains the bolt main body 20. It is explanatory drawing which shows the 4th procedure which obtains the bolt main body 20. It is explanatory drawing which shows the 5th procedure of obtaining the bolt main body 20. FIG. It is explanatory drawing which shows the final procedure which obtains the volt | bolt main body 20. FIG. It is explanatory drawing which shows the anchor bolt 10A of other embodiment in the assembly | attachment state equivalent to FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing an anchor bolt 10 according to an embodiment of the present invention in a perspective view together with the parts constituting the anchor bolt 10, and FIG. 2 is an explanatory view showing the anchor bolt 10 in a sectional view together with the parts constituting the anchor bolt 10. .

  The anchor bolt 10 is an extended post-installed anchor bolt that is mounted and fixed in a pilot hole described later, and includes a bolt body 20 and a driving pin 30. The bolt body 20 is formed as a hollow cylindrical body through a bending process of a steel plate such as stainless steel having a high corrosion resistance, one end side is an extension portion 22, and a portion excluding the extension portion 22 is a residual bolt body portion 24, A main body slit 26 is provided. The main body slit 26 is formed through the manufacture of the bolt main body 20 described later, and extends from one end side to the other end side along the bolt main body longitudinal direction.

  The extension part 22 is located on the lower end side of the bolt body and can be extended by a slit 23 along the longitudinal direction of the bolt body. As shown in FIG. 2, the expanded portion 22 is thicker than the residual bolt main body 24, and the inner diameter of the expanded portion 22 is smaller than the residual bolt main body 24. The remaining bolt main body 24 includes a flange having a diameter larger than the opening diameter of a pilot hole, which will be described later, in the opening on the driving side. In addition, the state of formation of each part including the expansion part 22 and the remaining bolt main body part 24 and the manufacturing procedure of the bolt main body 20 will be described later.

  The driving pin 30 is formed by cutting or rolling a metal shaft made of stainless steel or the like having a high corrosion resistance, and is set inside the bolt body 20 and driven into the lower end side of the bolt body. The driving pin 30 has a wedge inducing portion 32 at one end and a driving portion 34 at the other end, and the wedge inducing portion 32 and the driving portion 34 are connected by a connecting portion 36. The wedge inducing portion 32 and the driving portion 34 have the same outer diameter. The wedge inducing portion 32 has a tapered portion 32t at the tip, and is positioned on the side of the expansion portion 22 of the bolt body 20 in the set state of the driving pin 30, and is larger than the inner diameter of the expansion portion 22 as shown in FIG. It has an outer diameter. Therefore, the wedge inducing portion 32 enters the expansion portion 22 from the taper portion 32t side to expand the expansion portion 22 in the pilot hole and exhibits a wedge action. In the present embodiment, since the length Ls of the wedge inducing portion 32 is longer than the length Lb of the expanding portion 22, the wedge action by the wedge inducing portion 32 is reliably exhibited in the entire area of the expanding portion 22.

  The driving portion 34 is located on the driving side, and its tip is a tapered engaging portion 37 that engages with the flange 27 of the bolt body 20. The engagement between the flange 27 and the engagement portion 37 will be described later.

  The connecting portion 36 is smaller in diameter than the wedge inducing portion 32 and the driving portion 34 and smaller in diameter than the inner diameter of the expansion portion 22 of the bolt body 20, and is connected to the wedge inducing portion 32 and the driving portion 34 through a tapered slope. Yes. And this connection part 36 makes length Lp of an above-mentioned small diameter site | part longer than length Lb of the expansion part 22 along a bolt main body longitudinal direction.

  Next, how the floor surface is fixed by the anchor bolt 10 of this embodiment will be described. FIG. 3 is an explanatory view showing the first half of fixing the partition leg Pk to the floor surface F with the anchor bolt 10, and FIG. 4 is an explanatory view showing the latter half of fixing the partition leg Pk to the floor surface F with the anchor bolt 10. FIG.

  As shown in the figure, first, a pilot hole Sh is formed in the floor surface F with a concrete drill or the like. The depth of the pilot hole Sh is deeper than the sum of the total length of the bolt body 20 and the length Ls of the wedge inducing portion 32. This is because the wedge inducing portion 32 has a margin to pass through the extended portion 22 of the bolt body 20 and enter the pilot hole Sh, as will be described later. After forming the pilot hole, the partition leg Pk is placed so that the fixing hole Ph overlaps the pilot hole Sh, and the anchor bolt 10 is inserted into the pilot hole Sh from the fixing hole Ph. Then, the bolt body 20 holds the flange 27 on the upper surface of the partition leg Pk, causes the remaining bolt body portion 24 to enter the prepared hole Sh, and positions the extended portion 22 on the lower end side of the prepared hole Sh. In the present embodiment, the diameter of the prepared hole is 8Φ, and the outer diameters of the extension portion 22 and the remaining bolt body portion 24 in the bolt body 20 are 7.8 to 7.9φ. The driving pin 30 positions the wedge inducing portion 32 in front (upper side) of the expansion portion 22 so that the tapered portion 32t is engaged with the upper end of the inner wall of the expansion portion 22.

  In this state, the operator drives the upper end of the driving portion 34 of the driving pin 30, that is, the engaging portion 37 with the hammer H. The driving pin 30 is driven until the flange 27 and the engaging portion 37 in the residual bolt main body 24 are flush with each other, and in this state, the wedge inducing portion 32 enters the extended portion 22 and exhibits a wedge action. That is, as shown in the cross section shown in a free state where there is no pilot hole and the AA line cross section around the extension portion 22, each extension portion 22 divided by the slit 23 has a remaining bolt body portion 24. The joint is expanded by the wedge inducing portion 32 in the pilot hole Sh with the joint portion as a fulcrum, and a wedge action is induced.

  Next, as shown in FIG. 4, the operator hits the upper end of the flange 27 toward the engaging portion 37 with a hammer H, and bends the flange 27 so as to enter the tapered step of the engaging portion 37. . Thereby, fixation of the partition leg Pk by the anchor bolt 10 is completed. Note that driving of the flange 27 may be omitted.

  FIG. 5 is an explanatory view showing a state of extraction of the anchor bolt 10 after fixing. When releasing the fixation of the partition leg Pk for some reason, the operator presses the driving shaft Sp against the engaging portion 37 of the driving pin 30 as shown in the figure, and the driving shaft Sp is pushed by the hammer H. Type in. Then, the driving pin 30 pulls out the wedge inducing portion 32 from the extended portion 22 of the residual bolt main body portion 24 to the inner side of the prepared hole, and the extended portion 22 has a smaller diameter than the wedge inducing portion 32 and the extended portion 22. Since the connecting portion 36 having a smaller diameter than the inner diameter is positioned, the wedge action disappears. In this case, the anchor bolt 10 has the bolt body 20 inserted into the pilot hole Sh in a free state. Therefore, the partition leg Pk is lifted or a tool such as a minus screwdriver is pressed against the flange 27 and lifted. Thus, the anchor bolt 10 can be extracted from the pilot hole Sh. As a result, according to the anchor bolt 10 of the present embodiment, it is possible to cope with removal from the floor surface F after driving and fixing.

  In the anchor bolt 10 of this embodiment described above, the tip of the wedge inducing portion 32 in the driving pin 30 is a tapered portion 32t. Therefore, according to the anchor bolt 10 of the present embodiment, the wedge inducing portion 32 can be reliably guided to the expanded portion 22 by the taper portion 32t, so that the driving pin 30 can be driven easily and the wedge induction is achieved. The wedge action through the expansion of the expanded portion 22 by the portion 32 can be reliably exhibited.

  As shown in FIG. 4, the anchor bolt 10 of the present embodiment has a wedge inducing portion when the driving pin 30 is driven until the flange 27 and the engaging portion 37 of the remaining bolt main body 24 are flush with each other. 32 is inserted into the extended portion 22 and is held at a position where the wedge action is exerted. Therefore, according to the anchor bolt 10 of the present embodiment, since the driving portion 34 of the driving pin 30 is not protruded from the flange 27 in the driving fixed state, it is difficult to give an uncomfortable feeling.

  As shown in FIG. 4, the anchor bolt 10 according to the present embodiment has the flange 27 inserted into the tapered step of the engaging portion 37 in the driving and fixing state. Therefore, the appearance can be improved and the force to push up the driving pin 30 can be resisted by the flange 27 entering the tapered step of the engaging portion 37.

  Next, the manufacturing procedure of the anchor bolt 10 will be described. In manufacturing the anchor bolt 10, a bolt main body 20 and a driving pin 30 as bolt constituent parts shown in FIGS. 1 and 2 are prepared. The preparation of the driving pin 30 may be performed simultaneously with the preparation of the bolt body 20 or sequentially. A shaft material having the outer diameters of the wedge inducing portion 32 and the driving portion 34 is prepared. The driving pin 30 is obtained by cutting with a lathe. Specifically, the taper portion 32t is cut and formed, the connecting portion 36 that connects the wedge inducing portion 32 and the driving portion 34 is cut, and the engaging portion 37 is cut and cut. At this time, the length Ls and the length Lp of the connecting portion 36 and the wedge inducing portion 32 are made longer than the length Lb of the expanding portion 22. Further, the wedge inducing portion 32 is formed so that its outer diameter is larger than the inner diameter of the expanding portion 22 so that the expanding portion 22 can be expanded, and the outer diameter of the connecting portion 36 is from the wedge inducing portion 32 and the driving portion 34. The diameter is small and smaller than the inner diameter of the expansion portion 22. It should be noted that the wedge inducing portion 32, the connecting portion 36, and the like may be all cut out from the shaft material having a diameter larger than the outer diameter of the wedge inducing portion 32 and the driving portion 34 by cutting. Alternatively, the shaft material may be subjected to a rolling process, and the outer shape shown in FIGS. 1 and 2 may be formed by rolling to obtain the driving pin 30.

  The bolt body 20 is prepared by the following procedure. 6 is an explanatory diagram showing first and second procedures for obtaining the bolt body 20, FIG. 7 is an explanatory diagram showing a third procedure for obtaining the bolt body 20, and FIG. 8 is a fourth procedure for obtaining the bolt body 20. FIG. 9 is an explanatory diagram showing a fifth procedure for obtaining the bolt main body 20, and FIG. 10 is an explanatory diagram showing a final procedure for obtaining the bolt main body 20. As shown sequentially in these drawings, first, a rectangular steel plate 20p such as stainless steel is prepared, and slits 23 are formed in the rectangular steel plate 20p (step S100). The rectangular steel plate 20p has a rectangular shape in which the bolt body 20 shown in FIGS. 1 and 2 is expanded by breaking the bolt body 20 along the longitudinal direction of the bolt body so that the bolt body 20 is expanded by the body slit 26 extending over the entire length. There is no. The slits 23 are slits that are spaced in the shaping process described later, but are formed as streak-like cutting lines in the rectangular steel plate 20p.

  In the subsequent second procedure (step S110), the slit-formed rectangular steel plate 20p is pressed by the first molds K11 and K12. The first molds K11 and K12 form cavities that match the front and back shapes of the stripe-shaped bent ridges 27p when the flange 27 of the bolt body 20 is deployed as described above, and the formed slits 23 Bend the end side. Therefore, by pressing the rectangular steel plate 20p by the first molds K11 and K12, the rectangular steel plate 20p is provided with a streak-shaped bent ridge 27p on one end side and a flat plate provided with an end bent of the slit 23 formed on the other end side. Part 24p.

  In the subsequent third procedure (step S120), as shown in FIG. 7, the flat plate portion 24p having the bent ridges 27p, the slits 23, and the end portions is pressed by the second molds K21, K22, and K23. The second molds K21 and K22 are cavities that match the front and back shapes of the streak-shaped bent ridges 27p, and sandwich the bent ridges 27p that have been formed in the second procedure described above. After the slide, the end bent portion on the slit 23 side is bent to form a thickened portion 22p. Therefore, by pressing the flat plate portion 24p by the second molds K21, K22, K23, the flat plate portion 24p is provided with a streak-like bent ridge 27p on one end side and is divided by a slit 23 formed on the other end side. The thick part 22p is provided.

  In the subsequent fourth procedure (step S130), as shown in FIG. 8, the thick portion 22p of the flat plate portion 24p is pressed by the third molds K31 and K32. The third molds K31 and K32 form a cavity Kb3 for shaping each of the thick portions 22p divided by the slits 23 in an arc shape on both the upper and lower surfaces, and also provide the recess 22a in the extended portion 22. Shape. Therefore, the thick portions 22p divided by the slits 23 by pressing the thick portions 22p by the third molds K31 and K32 are thick, and the slits 23 They will be lined up. In this case, the concave portion 22a is positioned on the outer peripheral side arc of the thick portion 22p having an arc shape.

  In the following fifth procedure (step S140), as shown in FIG. 9, the bent ridges 27p, the flat plate portion 24p, and the thick portions 22p individually arc-shaped as described above, the fourth mold K41, Press at K42. The fourth molds K41, K42 are for shaping the thick portions 22p at both ends arranged with the slit 23 therebetween, together with the flat plate portion 24p and the bent ridges 27p so as to form an arc following the middle thick portion 22p. Cavity Kb4 is formed. Therefore, the thick wall portion 22p and the flat plate portion 24p by the fourth molds K41 and K42, and the thick rib portions 22p arranged on both sides of the slit 23 by the pressing of the bent protrusions 27p are connected to the thick wall portion of the flat plate portion 24p. Along with the flat plate portion 24p and the bent ridge 27p extending in the longitudinal direction, it is bent and shaped so as to form an arc following the middle thick portion 22p.

  In the final procedure (step S150), as shown in FIG. 10, the thick portions 22p on both ends arranged with the slits 23 interposed therebetween, together with the flat plate portions 24p and the bent ridges 27p, as shown by the white arrows in the figure. Curve. This curve is formed by forming the main body slit 26 (see FIG. 1) with the open ends of the thick portions 22p at both ends facing each other across the slit 23, and the flat plate portion 24p having the thick portions 22p and the bent ridges 27p formed thereon. However, it continues until it curves to a cylinder shape so that a longitudinal direction (up-down direction in a figure) may become an anchor bolt central axis. In this bending, the driving pin 30 itself or a simulated pin imitating the driving pin 30 can be used as the curved shaping core material. By passing through this final procedure, the curved thick portion 22p becomes an extended portion 22 that can be expanded by the slit 23, and this expanded portion 22 is thicker than the remaining bolt main body portion 24 and has a smaller inner diameter. . Further, the curved bent ridge 27p becomes a flange 27 having a diameter larger than the opening diameter of the pilot hole Sh and positioned in the opening on the driving side. The flat plate portion 24p is a residual bolt main body portion 24 provided with the extended portion 22 on one end side and the flange 27 on the other end side. In this way, the bolt body 20 is obtained. In the obtained bolt body 20, the prepared driving pin 30 is inserted from the tapered portion 32 t side, and the anchor bolt 10 is configured together with the driving pin 30.

  According to the manufacturing method of the anchor bolt 10 including the manufacturing procedure of the present embodiment described above, the anchor bolt 10 that can cope with the removal from the floor surface F after being driven and fixed is made hollow from the rectangular rectangular steel plate 20p. It can be easily obtained through formation of the bolt body 20.

  Next, another embodiment will be described. FIG. 11 is an explanatory view showing an anchor bolt 10A according to another embodiment in an assembled state corresponding to FIG. The anchor bolt 10 </ b> A includes a male screw portion 34 </ b> Hs at the upper end of the driving portion 34 of the driving pin 30. According to the anchor bolt 10A, the male screw portion 34Hs can be protruded from the fixing hole Ph of the partition leg Pk, and the partition leg Pk can be fixed to the floor surface F with a washer and a nut (not shown). Further, according to the anchor bolt 10A, when the male screw portion 34Hs is applied during the bolt extraction operation shown in FIG. 5, the wedge inducing portion 32 can be pulled out of the expansion portion 22 to cope with the extraction, so that the driving shaft Sp becomes unnecessary.

  The present invention is not limited to the above-described embodiment, and can be realized with various configurations without departing from the spirit of the present invention. For example, the technical features of the embodiments corresponding to the technical features in each embodiment described in the summary section of the invention are intended to solve part or all of the above-described problems, or part of the above-described effects. Or, in order to achieve the whole, it is possible to replace or combine as appropriate. Further, if the technical feature is not described as essential in the present specification, it can be deleted as appropriate.

  In the above-described embodiment, the bolt main body 20 is formed from the flat plate portion 24p so that the main body slit 26 remains, but the formation portion of the main body slit 26 can be welded or the like. In addition, if the nominal diameter of the anchor bolt 10 can be increased, the flange 27 and the recess 22a may be formed by cutting into a cylindrical body, and the slit 23 may be formed with a slotting tool or the like. In this case, if the inner diameter cutting is performed so that the inner diameter of the expanded portion 22 is larger than the remaining bolt main body portion 24 by the inner diameter processing, specifically, the inner diameter of the remaining bolt main body portion 24 is smaller than the expanded portion 22. Good.

DESCRIPTION OF SYMBOLS 10,10A ... Anchor bolt 20 ... Bolt main body 20p ... Rectangular steel plate 22 ... Expansion part 22a ... Recessed part 22p ... Thick part 23 ... Slit 24 ... Residual bolt main body part 24p ... Flat plate part 26 ... Main body slit 27 ... Flange 27p ... Bending convexity Article 30 ... Driving pin 32 ... Wedge inducing portion 32t ... Taper portion 34 ... Driving portion 34Hs ... Male screw portion 36 ... Connecting portion 37 ... Engaging portion F ... Floor surface H ... Hammer Sh ... Pilot hole Ph ... Fixing hole Pk ... Partition leg Sp ... Implanting shaft K11, K12 ... 1st mold K21, K22, K23 ... 2nd mold K31, K32 ... 3rd mold K41, K42 ... 4th mold Kb3-Kb4 ... Cavity

Claims (3)

An expansion type post-installed anchor bolt that is fixed in a pilot hole,
A hollow bolt body that enters the pilot hole, and a driving pin that is set inside the bolt body and is driven into the lower end side of the bolt body,
The bolt body is
An extended portion located on the lower end side of the bolt main body and expandable by a slit along the longitudinal direction of the bolt main body, and a remaining bolt main body excluding the expanded portion, the expanded portion is thicker and smaller in diameter than the remaining bolt main body. Prepare to have an inner diameter,
The driving pin is
A driving portion located on the driving side, and a wedge inducing portion which is located on the side of the expansion portion and enters the expansion portion to expand the expansion portion in the pilot hole and exert a wedge action. The induction portion and the driving portion have a smaller diameter, and are connected by a connecting portion having a smaller diameter than the inner diameter of the expansion portion.
The remaining bolt body portion of the bolt body includes a flange having a diameter larger than the opening diameter of the pilot hole in the opening on the driving side,
The connecting portion of the driving pin is longer than the length of the extended portion along the longitudinal direction of the bolt body ,
When the driving pin is further driven from the state where the wedge inducing portion exerts the wedge action, the wedge inducing portion is pulled out from the extended portion to the back side of the pilot hole, and the connecting portion is moved to the extended portion. Expanded post-installed anchor bolt configured to be positioned .   The extended post-installed anchor bolt according to claim 1, wherein the driving pin has a tapered tip end of the wedge inducing portion.   In the state where the driving portion is driven until the driving pin is flush with the flange of the remaining bolt main body portion, the wedge inducing portion enters the expansion portion and exerts the wedge action. The extended post-installed anchor bolt according to claim 1 or 2, wherein

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