JP2012233490A - Post-construction anchor bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new post-construction anchor bolt that simplifies a manufacturing process.SOLUTION: A post-construction anchor bolt 20 is formed by subjecting a single pipe material to pressure-forging and is a one-piece product comprising a first bolt part 30 and a second bolt part 40 connected by a connecting part 50. The first bolt part 30 has a tapered part 32 formed by pressure-forging to reduce the diameter of the pipe material. The second bolt part 40 is shaped by pressure-forging to have four slits 44 and a concavo-convex part 45 at a bolt top 42, in which an inner circumferential wall in a back face area of the concavo-convex part 45 serves as a guide face 46 to be joined with an outer circumferential face of the tapered part 32. The connecting part 50 is a vestige of forging to connect the first bolt part 30 and the second bolt part 40 at the bolt top 42, and is thin and rupturable.

Description

The present invention relates to an anchor bolt, and more particularly to a post-installed anchor bolt that can be reliably fixed to an existing floor or wall made of concrete or the like.

  Anchor bolts are used by being embedded in concrete in order to fix structural members (wood or steel) or equipment. If the installation location of structural members and equipment is determined from the beginning, anchor bolts can be installed on the floor surface in advance. However, when anchor bolts are installed later on existing concrete floors due to layout changes, etc. There is. Anchor bolts used for such purposes are generally referred to as “post-installed anchor bolts”, and various proposals have been made (for example, Patent Document 1).

JP 2002-349522 A Japanese Patent Laid-Open No. 10-24340

  The post-installed anchor bolt proposed in these publications is usually a so-called two-piece product of a sleeve and a pin, and is an assembly product in which each part is made separately and a pin is incorporated in the sleeve. Since it is an assembly product in this way, its handling is simple, but the individual creation and assembly of each part is indispensable, so that the manufacturing process has been required to be simplified.

  In view of the above-described problems, an object of the present invention is to provide a new post-installed anchor bolt that can simplify the manufacturing process.

  In order to achieve at least a part of the above object, the present invention adopts the following configuration.

[Application 1: Post-installed anchor bolt]
It is a post-installed anchor bolt that is fixed in the pilot hole,
A bottom side portion having an inclined surface that is inclined with respect to the pilot hole, is located on the bottom side of the pilot hole and enters the pilot hole;
It is located on the pilot hole opening side and enters the pilot hole, and includes an opening side portion that descends in the pilot hole by receiving driving toward the pilot hole bottom side,
The opening side portion is
It has a joint surface from the front end part that joins with the inclined surface of the bottom side part part as it descends and presses the peripheral wall of the pilot hole from the front end part, and before receiving the driving, the front end part In the continuous portion in the unit with the bottom side portion,
The connecting portion is
When forming the bottom side part and the opening side part by subjecting a single metal material to a shaping process, the bottom part is formed at the tip part along with the shaping process in a state that can be broken by the driving. The gist of the present invention is that the side part is connected to the opening part.

  According to the post-installed anchor bolt having the above configuration, when the bolt is mounted in the pilot hole, the bottom side portion and the opening side portion are integrated at the connecting portion. All you need to do is insert the part into the pilot hole. In fixing to the pilot hole, if the opening side part is driven toward the bottom of the pilot hole, the continuous part is broken by the initial driving, and the opening side part is made the pilot hole by the subsequent driving. In accordance with the lowering, the wedge action of pressing the peripheral wall of the pilot hole through the joining of the inclined surface of the bottom part and the joint surface of the opening part is completed, and the fixing to the pilot hole is completed. . That is, according to the post-construction anchor bolt having the above configuration, handling at the time of mounting / fixing to the pilot hole can be made as simple as the existing anchor bolt. In addition to this, according to the anchor bolts constructed after the above construction, both the bolt part parts of the bottom side part part and the opening side part part and the both bolt part parts can be broken by driving in the anchor bolt manufacturing. Since the connecting portions to be connected can be formed through a shaping process and manufactured as a one-piece product, it is not necessary to individually create and assemble each part, and the manufacturing process can be simplified.

  The post-construction anchor bolt described above can be configured as follows. For example, the bottom side portion and the opening side portion are formed by subjecting a single pipe material to the shaping process. In this shaping process, the bottom part is formed through the shaping process in which the pipe material is reduced to a small diameter taper on the opening side part, and the tapered shape is formed. The outer peripheral wall surface of the pipe material is defined as the inclined surface. The opening side portion is formed through the shaping process in which a plurality of slits extending in the axial direction from the tip portion are left on the outer wall of the pipe material around the pipe material peripheral wall, A peripheral wall surface is defined as the joint surface. About the said connection part, this shall connect the small diameter side of the said taper-shaped bottom side site | part part to the said opening side site | part part in the said front-end | tip part with the said shaping process. And when the said opening side site | part receives the said driving | running | working, it will raise | generate the said fall through the fracture | rupture of the said connection part, and the said joint surface on the said taper-shaped inclined surface of the said bottom side site | part part with the said fall Are joined, and the wedge action of exerting the tip portion into the peripheral wall of the pilot hole is exerted through expansion of the slit accompanying the riding. The post-installed anchor bolt according to this aspect is a one-piece anchor bolt having an opening side portion and a bottom portion corresponding to the sleeve and the pin proposed in the above-described patent document. In other words, the post-installed anchor bolt having the existing shape can be provided as a one-piece product. In this case, the slit described above is a bottomed slit at the time of undergoing the shaping process, and the bottomed portion is broken along with the lowering of the opening side portion that has been broken through the continuous portion, and then expanded. Or a slit that is not bottomed from the beginning.

  In this case, the bottom side portion and the opening side portion are formed through press forging as the shaping process, and the connecting portion is formed in the tapered shape at the tip portion with the press forging. The small diameter side of the bottom side portion can be connected to the opening side portion. If it carries out like this, the post-construction anchor bolt of the existing shape can be provided as a one-piece product which passed through press forging.

  Moreover, if the opening side portion is to have a shaft material gripped on the side of the pilot hole opening, the shaft material protrudes from the floor surface or the like, and this is used for fixing structural members and equipment. The core of the member can be used. If the opening side portion has a female screw on the opening side of the pilot hole, the structural member and the equipment can be fixed to the floor surface or the like with a male screw that is screwed into the female screw.

  Moreover, the said opening side site | part part can have the some annular recessed part and annular convex part which cross | intersect the said slit through the said press forging, and the said pipe material surrounding wall periphery. By doing so, the annular uneven portion enters the peripheral wall of the pilot hole, whereby the wedge action can be enhanced and the fixing strength can be increased.

  In addition, the bottom side portion and the opening side portion are formed by subjecting a single shaft material to the shaping process. At the time of the shaping process, the bottom side portion is provided with the inclined surface extending from the end portion, with the end portion on the bottom side of the pilot hole being formed into the shape of the shaft material. To do. The opening side portion is provided with the joint surface extending from the end portion side to the tip portion with the end portion of the pilot hole opening side having the shape of the shaft material. . About the said connection part, this shall connect the said bottom side site | part part to the said opening side site | part part in the said front-end | tip part. And when the said opening side site | part receives the said driving | running | working, it will cause the said fall through the fracture | rupture of the said connection part, and the said joint surface is joined to the said inclined surface of the said bottom side site | part part with the said fall. And exhibit the wedge action. This mode (shaft mode) is divided into the following two.

  In the first circular shaft mode, the bottom side portion is formed into a cross section in which the shaft material is crushed in the diametrical direction and surrounded by a plane and an outer peripheral wall surface of the shaft material, and Forming a press forging in which the part to be continuous continues from the opening side part part side over the forming range of the inclined surface, and the degree of crushing gradually decreases from the opening side part part side in the forming range of the inclined surface As a process, it forms through this press forging, and makes the said flat surface continuous over the formation range of the said inclined surface the said inclined surface. As for the opening side portion, the shaft material is crushed in the diametrical direction opposite to the bottom side portion to form a cross section surrounded by a plane and an outer peripheral wall surface of the shaft material. The region to be formed is continuous over the formation range of the joining surface from the tip portion side, and the crushing degree is formed through the pressing forging gradually decreasing from the tip portion side in the joining surface formation range, The plane that is continuous over the formation range of the joint surface is defined as the joint surface. About the said opening side site | part part, this shall connect the edge part of the said bottom side site | part part to the said opening side site | part part in the said front-end | tip part with the said press forging.

  In the second shaft mode, the bottom side portion and the opening side portion are formed by subjecting a single shaft material to an incision process that inclines obliquely leaving a part of the outer peripheral wall as the shaping process. In addition, the bottom side portion is the cut surface as the bonding surface, and the opening side portion is the other cut surface as the bonding surface. In addition, the bottom portion is connected to the opening-side portion at the outer peripheral wall portion of the shaft material remaining at the distal end portion in connection with the incision treatment.

  The post-installed anchor bolts of the first and second shaft modes are used as follows. First, after each aspect, the bottom portion of the construction anchor bolt is inserted into the pilot hole, and the opening portion is driven toward the bottom of the pilot hole. By doing so, the continuous portion is broken by the initial driving, and the opening side portion is lowered at the pilot hole by the subsequent driving, and the inclined surface and the opening side portion of the bottom side portion are accompanied by the lowering. The wedge action of pressing the peripheral wall of the pilot hole through the joint with the joint surface of the part is exhibited, and the fixing to the pilot hole is completed. In other words, while it is a shaft material, it can be handled easily at the time of mounting / fixing to the pilot hole after making the one-piece product with the post-construction anchor bolts of the first and second shaft modes described above, This can be simplified for the manufacturing process.

  In this case, if the single circular shaft member is subjected to the press forging or the incision process, the wedge action of pressing the peripheral wall of the circular pilot hole is reliably exerted on the circular shaft member peripheral wall. In addition, if the opening side portion is the male screw part at the end of the pilot hole opening side, a structural member and equipment can be placed on the floor surface by using a nut that is screwed into the male screw part. It can be fixed to etc.

It is a perspective view which shows the external appearance of the post-construction anchor bolt 20 of 1st Example. It is sectional drawing which expands and shows a principal part, seeing the construction anchor bolt 20 in the cross section that it is the 2-2 line in FIG. FIG. 3 is a cross section taken along line 3-3 in FIG. 1. It is explanatory drawing which shows the preparation procedure of bolt manufacture. It is explanatory drawing which shows the mode of the type | mold at the time of manufacturing the post-construction anchor bolt 20 by forging. It is explanatory drawing for demonstrating the structure of a forging die. It is explanatory drawing explaining the mode of the press forging of external shaping. It is explanatory drawing explaining the mode of the forge shaping of the slit. FIG. 4 is a perspective view showing an appearance of a post-installed anchor bolt 20 having a female screw 47 on the inner peripheral wall of a second bolt part 40. It is explanatory drawing explaining the mode of construction of post-construction anchor bolt 20. FIG. It is explanatory drawing which shows the apparatus fixing method which used together the cutting bolt SB for the post-construction anchor bolt 20. FIG. It is explanatory drawing which shows the apparatus fixing method which used shaft material SS together for the post-construction anchor bolt 20. FIG. It is explanatory drawing which shows the method of standing steel frame TS on the floor Fm with the post-construction anchor bolt 20. FIG. It is explanatory drawing which shows the post-construction anchor bolt 120 of the 2nd Example formed by carrying out the press forging of the single circular shaft material with each step cross section of each site | part. It is explanatory drawing which shows the manufacture procedure of the post-installation anchor bolt 120. FIG. It is explanatory drawing explaining the mode of construction of post-construction anchor bolt 120. FIG. It is explanatory drawing which shows the apparatus fixing method by the post-construction anchor bolt 120 which has the external thread 144. FIG. It is explanatory drawing which shows the post-construction anchor bolt 220 of the 3rd Example formed by processing a single circular shaft material to an incision process with each step cross section of each site | part. It is explanatory drawing which shows the manufacture procedure of the post-installation anchor bolt 220. FIG. It is explanatory drawing explaining the mode of construction of post-construction anchor bolt 220. FIG.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an external appearance of a construction anchor bolt 20 after the present embodiment, and FIG. 2 is a sectional view showing an enlarged main part while viewing the construction anchor bolt 20 as a section taken along line 2-2 in FIG. 3 is a cross-sectional view taken along line 3-3 in FIG.

  As shown in the drawing, the post-installed anchor bolt 20 is formed by subjecting a single pipe material to press forging, and is a one piece in which a first bolt portion 30 and a second bolt portion 40 are connected by a connecting portion 50. It is a product. In this case, the pipe material at the time of bolt manufacture, that is, the post-installed anchor bolt 20 itself can be made of various metals, for example, stainless steel, iron, iron alloy, brass, etc. it can. In addition, since post-installed anchor bolts 20 are often used outdoors, plating with a highly corrosion-resistant metal such as chromium also serving as rust prevention or gloss chromate (Unichrome) treatment is added to the manufacturing procedure described later. You can also

  The first bolt part 30 has a cone-like outer shell and a tapered part 32 in which the pipe material has a small diameter on the second bolt part 40 side. The second bolt part 40 is a part of the pipe material and has a sleeve shape, and the first bolt part 30 side is a bolt tip 42. And this 2nd bolt part 40 equips the outer peripheral wall of the bolt front-end | tip 42 with the four stripes 44 extended in an axial direction at equal pitches around a peripheral wall, and is provided with the uneven part 45 in the outer peripheral wall of a slit formation range. The inner peripheral wall of the back surface range of the concavo-convex portion 45 is a guide surface 46 that is joined to the outer peripheral wall surface of the tapered portion 32 during fixed use. About this slit 44, the number of slits can be defined to 3 or 5 or more so that the later-described expansion of the bolt tip 42 in the second bolt portion 40 occurs, and at the time of undergoing press forging described later, It is a bottomed slit, and the bottomed portion of the slit is broken along with the lowering of the second bolt portion 40 after the breakage of the connecting portion 50, and can be expanded thereafter, or can be a slit that is not bottomed from the beginning. . The connecting portion 50 connects the small diameter side of the first bolt portion 30, that is, the small diameter portion of the tapered portion 32, to the bolt tip 42 of the second bolt portion 40. As will be described later, the connecting portion 50 is formed by pressing and forging a single pipe to form the first bolt portion 30 and the second bolt portion 40. It is a forging mark formed so as to connect the two bolt portions 40, and is thin and breakable.

  Next, a method for manufacturing the post-installed anchor bolt 20 will be described. FIG. 4 is an explanatory view showing a preparatory procedure for bolt manufacture, and FIG. 5 is an explanatory view showing a state of a mold when the post-installed anchor bolt 20 is manufactured by forging.

  As shown in FIG. 4, first, a single pipe material P is prepared, and a first core die SK1 and a second core die SK2 are set. The first and second core molds include core mold portions SP1 and SP2 that enter the pipe material P, respectively. The core part SP1 has a cone shape, and becomes a core when subjected to press forging so that the pipe material P corresponding to the first bolt part 30 is reduced in diameter to a cone shape, and the outer shape of the first bolt part 30 is It is formed together with a forging die described later. The core-shaped part SP2 serves as a core when the pipe material P corresponding to the second bolt part 40 is subjected to press forging so that the outer periphery of the pipe material P is formed at the outer periphery of the part 45, and the outer part of the second bolt part 40 The shape is formed together with a forging die described later.

  As shown in FIG. 5, in the forging formation of the post-installed anchor bolt 20, a fixed forging die KKs and a drive forging die KKm are used, and the first core die SK1 and the second core die are placed between these two dies. The pipe material P on which SK2 is already mounted is clamped. In this state, while driving the drive forging die KKm toward the fixed forging die KKs, the drive forging die KKm is slid from the front side to the back side in FIG. A single pipe material P is subjected to press forging by pressing and sliding of the drive forging die KKm, and the post-installed anchor bolt 20 having a shape following the die shape of both forging dies can be obtained. Hereinafter, a forging die and a forging method using the same will be described. FIG. 6 is an explanatory diagram for explaining the configuration of the forging die, FIG. 7 is an explanatory diagram for explaining the appearance of the press forming for external shaping, and FIG. 8 is an explanatory diagram for explaining the forging shaping of the slit 44. .

  As shown in FIG. 6, the fixed forging die KKs has three first protrusions T1 and one second protrusion T2 protruding from the mold surface. The first ridge T1 is a ridge for forming the concavo-convex portion 45 on the bolt tip 42 side of the second bolt portion 40, and the second ridge T2 is the first volt portion 30 having the tapered portion 32. It is a ridge for forming. These ridges are formed so that the degree of protrusion gradually increases from the left end side to the right end side of the fixed forging die KKs in FIG. 6, as shown in the sectional view in FIG. 6 and its enlarged drawing. Then, the convexity and shape of the first ridge T1 are defined so as to be uneven according to the uneven shape of the uneven portion 45 at the rightmost end of the fixed forging die KKs. The degree and shape of the protrusion are defined so that the rightmost end of the fixed forging die KKs has a protrusion that follows the outer shape of the tapered portion 32. The drive forging die KKm that is pressed toward the fixed forging die KKs has three first protruding ridges T1 and one second protruding ridge T2 on the die surface facing the fixed forging die KKs. Referring to FIG. 7, the drive forging die KKm has a convexity degree and a shape defined so as to follow the uneven shape of the uneven portion 45 with respect to the first protrusion T1 on the leftmost end side in FIG. 7. As for the second ridge T2, the degree of protrusion and the shape of the second ridge T2 are defined so as to follow the outer shape of the tapered portion 32, and the degree of protrusion of these ridges gradually decreases from the left end side to the right end side. It is formed to become.

  In press forging with the fixed forging die KKs and the driving forging die KKm, as shown in FIG. 7, the left end side of the fixed forging die KKs and the right end side of the driving forging die KKm face each other, and the first core die SK1. And the pipe material P to which the second core die SK2 has been attached is sandwiched. In this state, the drive forging die KKm is slid with respect to the fixed forging die KKs as shown in FIG. 7 while pressing the driving forging die KKm toward the fixed forging die KKs. During this time, the pipe material P rolls between the forging dies together with the slide of the drive forging die KKm, and through this rolling, the pipe material P has irregularities in the shape defined by the first ridge T1. The uneven portion 45 thus formed is shaped, the second bolt portion 40 having the uneven portion 45 is formed by forging, and the cone-shaped first bolt portion 30 defined by the second protrusion T2 is formed by press forging. In other words, the first bolt part 30 is formed through the press forging in which the pipe material P is reduced in a taper shape with a small diameter on the second bolt part 40 side. Small diameter. And the connection part 50 connects with the 2nd bolt part 40 the small diameter side of the 1st bolt part 30 in the bolt front-end | tip 42 while being formed in connection with said press forging in the level | step-difference part of 2nd protruding item | line T2. , Thin. The degree of this thinness is defined by the state of protrusion of the second ridge T2 and the shape of the core part SP1 of the first core mold SK1. After pressing and sliding the drive forging die KKm, the first bolt part 30 having the taper part 32 and the second bolt part 40 having the concavo-convex part 45 are connected by the thin connecting part 50, and then the middle of the construction anchor bolt 20 Goods are obtained.

  Then, after that, an intermediate product of the anchor bolt 20 to be installed is set between the slit forming forged lower die SKd and the slit forming forged upper die SKu shown in FIG. Tighten (see FIG. 8B). The slit-formed forged lower die SKd and the slit-formed forged upper die SKu have a pressing blade portion SE for forging and forming a bottomed slit 44 with a depth that slightly leaves the inner wall side of the pipe material. The two slits 44 facing the bolt 20, specifically the bolt tip 42 of the second bolt portion 40, are formed by forging. Then, after opening the upper and lower molds, the post-construction anchor bolt 20 is rotated 90 degrees (see FIG. 8C), and the mold is clamped again. Thereby, the slit 44 is forged and formed at the bolt tip 42 of the second bolt part 40 at an equal pitch, and the final post-installed anchor bolt 20 is obtained. In addition, the slit 44 can also be made into 3 stripes or 5 or more stripes.

  Next, the usage state of the obtained construction anchor bolt 20 will be described. FIG. 9 is a perspective view showing the external appearance of the post-installed anchor bolt 20 having the female screw 47 on the inner peripheral wall of the second bolt portion 40, and FIG. 10 is an explanatory view for explaining the state of the post-installed anchor bolt 20.

  The female thread 47 of the post-installed anchor bolt 20 shown in FIG. 9 is formed by performing inner diameter thread cutting following forging formation of the first bolt portion 30 and the slit 44 and the like. In this case, the nominal diameter of the female screw 47 and the inner and outer diameters of the post-installed anchor bolt 20 are determined by properly using the pipe material P used for forging as described above, and taking into consideration the weight and size of the device to be fixed. Various decisions can be made. For example, if a nominal diameter of a screw of about M16 is required, the post-installed anchor bolt 20 may be forged using a pipe material P capable of forming a female thread having the nominal diameter. M8, M12, M20, M22 , M24, etc.

  In order to fix the equipment with the post-construction anchor bolt 20, as shown in FIG. 10, first, a pilot hole Sh is drilled in a concrete floor Fm with a drill or the like. In this case, the prepared hole Sh has a diameter that allows the second bolt portion 40 of the post-installed anchor bolt 20 to be inserted.

  Next, the inside of the pilot hole Sh is cleaned using a dust pump, a suction machine, or the like to remove cutting powder or the like, and a post-installed anchor bolt 20 is inserted into the pilot hole Sh from the first bolt part 30 side. Since the post-construction anchor bolt 20 connects the first bolt portion 30 and the second bolt portion 40 at the connecting portion 50, the post-construction anchor bolt 20 is held by the hand of the first bolt portion 30 like the existing bolt. It is only necessary to insert into the pilot hole Sh from the side, which is convenient. The first bolt part 30 enters the pilot hole Sh and is located on the bottom side of the pilot hole, and inclines the inclined outer peripheral wall surface of the tapered part 32 with respect to the pilot hole Sh. In the second bolt portion 40 integrated with the first bolt portion 30 and the connecting portion 50, the second bolt portion 40 enters the pilot hole Sh on the bolt tip 42 side and is located on the pilot hole opening side, and from the floor Fm to the upper side thereof. It extends to. In this case, the slit 44 and the concavo-convex part 45 of the second bolt part 40 are located above the small diameter side of the tapered part 32 of the first bolt part 30 in the pilot hole Sh, and the second bolt part 40 is a pilot hole It descends in the pilot hole Sh by receiving driving toward the bottom side of Sh.

  In performing such driving, the driving jig J is mounted on the second bolt part 40. The driving jig J includes a tip projection having a diameter smaller than the nominal diameter of the female screw 47 of the second bolt portion 40, and rises from the second bolt portion 40 by fitting the projection into the female screw 47. When the driving jig J is hit with a hammer or the like, the second bolt part 40 begins to descend, and at the beginning, the thin connecting part 50 (see FIGS. 1 and 2) is broken. When the connecting portion 50 is broken in this way, the second bolt portion 40 continues to descend further, and the guide surface 46 shown in FIG. 2 is joined to the outer peripheral wall surface of the tapered portion 32 of the first bolt portion 30 as it descends. The slit 44 of each muscle is first broken at the bottomed portion and then expanded. Then, the concavo-convex part 45 of the second bolt part 40 becomes four widened pieces by the four slits 44, and after pressing the peripheral wall of the pilot hole Sh with the concavo-convex outer peripheral wall in the axial direction, Since it bites into the peripheral wall of the pilot hole Sh, a wedge action is exhibited by the guide surface 46 (see FIG. 2) of the second bolt part 40 and the outer peripheral wall surface of the tapered part 32 of the first bolt part 30. And the post-construction anchor bolt 20 is firmly fixed to the pilot hole Sh by this wedge action. In this case, the second bolt part 40 is driven and lowered until the rear end face thereof is substantially flush with the floor Fm. Thereafter, the driving jig J is removed, the L-shaped fixing channel Lc for fixing the device is set on the post-construction anchor bolt 20, and the bolt B is screwed into the female screw 47 of the second bolt portion 40. Fixing of the fixed channel Lc on the floor Fm is completed. That is, according to the post-installed anchor bolt 20 of the present embodiment, handling at the time of mounting / fixing to the pilot hole Sh can be simplified as with the existing anchor bolt.

  FIG. 11 is an explanatory view showing a device fixing method using the post-construction anchor bolt 20 together with the cut bolt SB, FIG. 12 is an explanatory view showing a device fixing method using the post-construction anchor bolt 20 together with the shaft material SS, and FIG. It is explanatory drawing which shows the method of standing steel frame TS on the floor Fm with the post-construction anchor bolt 20. FIG.

  As shown in FIG. 11, when the cut bolt SB is screwed into the post-installed anchor bolt 20 that has been fixed as described above on the floor Fm, the cut bolt SB rises high from the floor Fm. Therefore, even if the fixed object K is thick, the fixed object K can be firmly fixed to the floor Fm if the nut NT is screwed to the cut bolt SB with the washer W interposed. In the figure, a double nut is used to prevent loosening, but a single nut can also be fixed.

  In FIG. 12, before fixing the floor surface of the post-installed anchor bolt 20, the shaft material SS is inserted into the second bolt portion 40 and caulked on the outer periphery, whereby the shaft material SS is fixed with the caulking marks Kk. In this case, the shaft material SS is inserted to the extent that it does not interfere with the first bolt part 30 fitted in the second bolt part 40, and then crimped and fixed. After that, according to the construction anchor bolt 20, the shaft material SS is inserted into the fixing target steel plate Mp after being fixed to the floor Fm, and the shaft material end is welded to the fixing target steel plate Mp, thereby fixing the fixing target steel plate Mp to the floor Fm. Can be fixed. When fixing the shaft material SS, the shaft material SS inserted to the extent that it does not interfere with the first bolt portion 30 can be welded and fixed to the second bolt portion 40 by a technique such as spot welding.

  In FIG. 13, similarly to the shaft material SS of FIG. 12, the steel frame material TS is caulked and fixed to the post-construction anchor bolt 20 in advance. Then, after fixing the steel frame TS, if the construction anchor bolt 20 is fixed to the floor Fm as described above, a new steel frame TS is erected on the floor Fm, and this steel frame TS is used as a reinforcing bar core. it can. Also about this steel frame TS, the steel frame TS inserted to such an extent that it does not interfere with the first bolt part 30 can be welded and fixed to the second bolt part 40 by a technique such as spot welding.

  As described above, according to the present embodiment, the post-construction anchor bolt 20 having the first bolt part 30 and the second bolt part 40 can be provided as a one-piece product while adopting the existing shape. Individual creation and assembly are unnecessary, and the manufacturing process can be simplified.

  Next, another embodiment will be described. FIG. 14 is an explanatory view showing the construction anchor bolt 120 together with each step cross section of each part after the single circular shaft material is formed by press forging. As shown in the figure, even in the post-construction anchor bolt 120, the first bolt portion 130 and the second bolt portion 140 are one-piece products connected by a connecting portion 150. In this case, as described above, the circular shaft member for bolt manufacture, that is, the post-installed anchor bolt 120 itself, can be a metal used for ordinary bolts such as stainless steel, iron, iron alloy, and brass. In addition, regarding the shaft diameter, the diameter can be set to 4 mm to 10 mm, and by doing so, it can be used as a substitute for a concrete nail that is driven into the concrete floor surface for fixing the device. The state of device fixation at this time will be described later.

  The first bolt part 130 includes a tapered part 132. The taper portion 132 is a cross-section in which the cross-sectional shape of each portion is a cross-section in which the circular shaft material is crushed in the diametrical direction and surrounded by a plane and an arc surface, and the cross-sectional area decreases toward the second bolt portion 140 side. Has been. In other words, the first bolt part 130 extends the tapered part 132 that becomes an inclined surface from the end part after making the end part of the bottom side of the pilot hole Sh described later into the shape of a circular shaft material. The second bolt part 140 includes a bolt front end 141 on the first bolt part 130 side, and includes a tapered part 142 from the bolt front end 141. The tapered portion 142 is a cross-section in which each section has a cross-sectional shape in which a circular shaft member is crushed in the diametrical direction opposite to the first bolt portion 130 and surrounded by a flat surface and an arc surface. The inclined portion has a small cross-sectional area. That is, the second bolt portion 140 is formed by forming the end portion on the opening side of the pilot hole Sh, which will be described later, into the shape of a circular shaft material, and extending the tapered portion 142 serving as an inclined surface from the end portion to the bolt tip 141. become. The connecting portion 150 connects the small cross-sectional area portion of the tip of the tapered portion 132 of the first bolt portion 130 to the bolt tip 141 of the second bolt portion 140. As will be described later, the connecting portion 150 is formed by pressing and forging a single circular shaft member to form the first bolt portion 130 and the second bolt portion 140. Forging marks formed so as to connect the second bolt part 140 and the second bolt part 140 are thin and can be broken. In addition, after that, the construction anchor bolt 120 may be configured to have a male screw 144 on the end side of the second bolt part 140 as shown in FIG.

  Next, a method for manufacturing the post-installed anchor bolt 120 will be described. FIG. 15 is an explanatory view showing a procedure for manufacturing the post-installed anchor bolt 120.

  As shown in FIG. 15, first, a single circular shaft material Sb is prepared, and the circular shaft material Sb is subjected to press forging using both the first forging die HK1 and the second forging die HK2. Both the first forging die HK1 and the second forging die HK2 have a cavity portion Kr having a concave die surface that follows the outer shape of the circular shaft material Sb on the die surface, and protruding press forging die portions Kp1, Kp2. Have The press forging die part KP1 of the first forging die HK1 is a protruding line for forming the tapered part 142 of the second bolt part 140, and the top of the protruding line is formed so that the degree of protrusion gradually increases following the cavity part Kr. It is an inclined surface. The press forging die part KP2 of the second forging die HK2 is a protruding line for forming the tapered part 132 of the first bolt part 130, and the top of the protruding line is formed so that the degree of protrusion gradually increases following the cavity part Kr. It is an inclined surface. The press forging die portion KP1 and the press forging die portion KP2 are formed in the respective die so as to leave a slight gap in the clamping state during press forging (see FIG. 15B). The part of the remaining gap becomes the part where the connecting part 150 is formed.

  By the press forging of the circular shaft material Sb using both the above-mentioned molds, the first bolt portion 130 is surrounded by a flat surface and an arc surface by the circular shaft material Sb being crushed in the diameter direction by the press forging die portion KP2. The cross-section portion is continuous over the range of the press forging die portion KP2 from the second bolt portion 140 side, and the degree of the shaft material being crushed is within the range of the press forging die portion KP2. The press forging gradually decreases from 140 side. As a result, the tapered portion 132 is forged and formed on the first bolt portion 130. The second bolt part 140 has a cross section in which the circular shaft material Sb is crushed in the diameter direction opposite to the first bolt part 130 in the press forging die part KP1 and surrounded by a plane and an arc surface. The part continues from the bolt tip 141 side over the range of the press forging die portion KP1, and the degree of squeezing of the shaft material undergoes press forging gradually decreasing from the bolt tip 141 side in the range of the press forging die portion KP1. As a result, the tapered portion 142 is formed in the second bolt portion 140 by forging. And the connection part 150 is formed with said forging in the site | part of the residual clearance gap between the press forging die part KP1 and the press forging die part KP2, and is a taper part of the 1st bolt part 130 in the bolt front end 141. 132 is connected to the tapered portion 142 of the second bolt portion 140 to make it thin. Thus, the construction anchor bolt 120 is obtained after the first bolt portion 130 having the tapered portion 132 and the second bolt portion 140 having the tapered portion 142 are connected by the thin connecting portion 150. Then, according to a use, the external thread 144 is formed in the 2nd bolt part 140 (refer FIG. 14). The degree of thinness of the connecting portion 150 is defined by the extent of the remaining gap between the press forging die portion KP1 and the press forging die portion KP2.

  Next, the usage state of the obtained construction anchor bolt 120 will be described. FIG. 16 is an explanatory diagram for explaining the state of the post-construction anchor bolt 120 construction.

  In order to fix the equipment with the post-construction anchor bolt 120, as shown in FIG. 16, first, a pilot hole Sh is drilled in a concrete floor Fm with a drill or the like. In this case, the prepared hole Sh has a diameter that allows the post-installed anchor bolt 120 to be inserted.

  Next, the inside of the pilot hole Sh is cleaned using a dust pump, a suction machine, or the like, cutting powder or the like is removed, and a post-installed anchor bolt 120 is inserted into the pilot hole Sh from the first bolt part 130 side. Since the post-construction anchor bolt 120 connects the first bolt portion 130 and the second bolt portion 140 at the connecting portion 150, the post-construction anchor bolt 120 is held by hand in the same manner as the existing bolt. It is only necessary to insert into the pilot hole Sh from the side, which is convenient. The first bolt part 130 enters the pilot hole Sh and is positioned on the bottom side of the pilot hole, and inclines the inclined outer wall surface of the tapered part 132 with respect to the pilot hole Sh. In the second bolt part 140 integrated with the first bolt part 130 and the connecting part 150, the pilot bolt Sh enters the pilot hole Sh on the side of the bolt front end 141 and is located on the pilot hole opening side, and above the floor Fm. It extends to. The second bolt part 140 descends in the pilot hole Sh by receiving driving in toward the bottom side of the pilot hole Sh.

  In performing such driving, when the post-construction anchor bolt 120, specifically, the upper end of the second bolt part 140 is struck with a hammer or the like, the second bolt part 140 begins to descend, and at the beginning, the thin connecting part 150 Will break. When the connecting portion 150 is broken in this way, the second bolt portion 140 continues to descend further, and the inclined outer wall surface of the tapered portion 142 is joined to the inclined outer wall surface of the tapered portion 132 in the first bolt portion 130 along with the lowering. In this joining range, the wedge action is exerted so that the circular arc surface peripheral walls (see FIG. 14) of the tapered portion 142 and the tapered portion 132 press the peripheral wall of the pilot hole Sh. And the post-construction anchor bolt 120 is firmly fixed to the pilot hole Sh by this wedge action. In this case, the second bolt part 140 causes the rear end part to protrude from the floor Fm after the completion of driving. Thereafter, for example, a plate-like fixed object Kmp and a pressing metal fitting Pk that are thinner than the protruding length of the second bolt part 140 are set on the post-installed anchor bolt 120, and the protruding end of the second bolt part 140 is set with a hammer or the like It is driven and bent until it fits in the pressing metal fitting Pk. Thereby, the fixation of the fixed object Kmp on the floor Fm is completed. That is, according to the post-installed anchor bolt 120 of the present embodiment, the handling at the time of mounting and fixing to the pilot hole Sh can be made as simple as the existing anchor bolt.

  FIG. 17 is an explanatory view showing a device fixing method using post-installed anchor bolts 120 having male screws 144. In FIG. 17, the anchor bolt 120 to be installed after the male anchor 144 is extended from the floor Fm after being fixed to the floor Fm as described above, the fixing object Kmp is fixed to the floor Fm by using a nut and a washer. it can.

  As described above, according to the post-construction anchor bolt 120 shown in FIG. 14, the bolt is formed in the shape of a shaft material that has undergone press forging of a single circular shaft material Sb. In addition to simplifying the handling when mounting and fixing to the camera, the manufacturing process can be simplified. Moreover, the post-construction anchor bolt 120 having a new shape having a shaft shape can be provided, and the application can be expanded.

  FIG. 18 is an explanatory view showing the construction anchor bolt 220 together with each step cross section of each part after the single circular shaft member is formed by the cutting process. As shown in the drawing, even after the construction anchor bolt 220, the first bolt portion 230 and the second bolt portion 240 are one-piece products connected by a connecting portion 250. In this case, as described above, the circular shaft member for bolt manufacture, that is, the post-installed anchor bolt 220 itself, can be a metal used for ordinary bolts such as stainless steel, iron, iron alloy, and brass. In addition, regarding the shaft diameter, the diameter can be set to 4 mm to 10 mm, and by doing so, it can be used as a substitute for a concrete nail that is driven into the concrete floor surface for fixing the device.

  The first bolt part 230 includes a taper part 232, and the second bolt part 240 includes a taper part 242. Both the taper parts leave a slight gap as shown in the cross section of FIG. Facing each other. In other words, the first bolt portion 230 extends the tapered portion 232 that becomes an inclined surface from the end portion after the end portion on the bottom side of the pilot hole Sh described later is formed into a circular shaft material shape. The second bolt portion 240 has an end portion on the opening side of a pilot hole Sh, which will be described later, formed in the shape of a circular shaft member, and the tapered portion 242 serving as an inclined surface is extended from this end portion to the bolt front end 241. And the first bolt part 230 and the second bolt part 240 that face the taper part in this way are formed by being subjected to forging that inclines obliquely leaving a part of the outer peripheral wall part of the single circular shaft material, The connecting portion 250 is a part of the remaining shaft material outer peripheral wall, which can be broken, and connects the tapered portion 232 to the bolt tip 241 at the bolt tip 241. In addition, even if it exists in the construction anchor bolt 220 after this, it can also be set as the form (refer FIG. 14) without the external thread 244 in the 2nd bolt part 240. FIG.

  Next, a method for manufacturing the post-installed anchor bolt 220 will be described. FIG. 19 is an explanatory view showing a procedure for manufacturing the post-installed anchor bolt 220.

  As shown in FIG. 19, first, a single circular shaft material Sb is prepared, and the circular shaft material Sb is cut and forged with both the shaft material holding die HK3 and the cutting forging die HK4 for cutting and forging. To. The shaft material holding mold HK3 includes a cavity portion having a concave mold surface following the outer shape of the circular shaft material Sb on the mold surface, and holds the circular shaft material Sb at the lower end of the shaft (FIG. 19A). reference). The incision forging die HK4 includes an incision cutting blade HKn. The incision cutting blade HKn is obliquely projected into the circular shaft material Sb held by the shaft material holding die HK3, and a tapered portion 242 and a tapered portion 232 are formed. Are formed at the bolt tip 241 leaving the connecting portion 250 (see FIG. 19B), and an intermediate product of the post-installed anchor bolt 220 is obtained. In this case, the tapered portion 232 is turned up following the incision cutting edge HKn. Subsequently, the intermediate product of the post-installed anchor bolt 220 is once removed from the shaft material holding die HK3 and then the intermediate product of the post-installed anchor bolt 220 using both the holding die HK5 and the straightening die HK6. Are processed in the final shaping process. The holding mold HK5 includes a cavity portion having a concave mold surface that follows the outer shape of the circular shaft member Sb on the mold surface, and holds the intermediate product at the lower end of the second bolt portion 240 (FIG. 19). (See (C)). The correction mold HK6 includes a cavity portion HKb having a concave mold surface that follows the outer shape of the circular shaft material Sb, and is slid from above the mold so as to be joined to the holding mold HK5. By this sliding, the tapered portion 232 is pushed by the cavity portion HKb while being connected by the connecting portion 250 and faces the tapered portion 242 (see FIG. 19D). Thereby, the post-construction anchor bolt 220 is obtained.

  FIG. 20 is an explanatory diagram for explaining the state of the post-construction anchor bolt 220 construction. As shown in the drawing, even after this, the construction anchor bolt 220 is fixed in the same procedure as the post-construction anchor bolt 120 described above. That is, as shown in FIG. 20, the post-construction anchor bolt 220 is inserted into the pilot hole Sh drilled in the floor Fm from the first bolt portion 230 side. Since the post-construction anchor bolt 220 connects the first bolt portion 230 and the second bolt portion 240 at the connecting portion 250, the post-construction anchor bolt 220 is held by hand like the existing bolt of the first bolt portion 230. It is only necessary to insert into the pilot hole Sh from the side, which is convenient. The first bolt part 230 enters the pilot hole Sh and is positioned on the bottom side of the pilot hole, and inclines the inclined outer wall surface of the tapered part 232 with respect to the pilot hole Sh. In the second bolt part 240 integrated with the first bolt part 230 and the connecting part 250, the first bolt part 230 enters the pilot hole Sh from the connecting part 250 side at the tip, and is located on the pilot hole opening side, and the floor Fm. The male screw 244 is extended from. The second bolt part 240 descends in the pilot hole Sh by receiving driving in toward the bottom side of the pilot hole Sh.

  In performing such driving, when the upper end of the second bolt part 240 is hit with a hammer or the like, the second bolt part 140 starts to descend, and at the beginning, the thin connecting part 250 is broken. When the connecting portion 250 is broken in this way, the second bolt portion 240 continues to descend further, and the inclined outer wall surface of the tapered portion 242 is joined to the inclined outer wall surface of the tapered portion 232 in the first bolt portion 230 along with the lowering. In this joining range, the wedge action is exhibited so that the circular arc surface peripheral walls (see FIG. 18) of the tapered portion 242 and the tapered portion 232 press the peripheral wall of the pilot hole Sh. The post-construction anchor bolt 220 is firmly fixed to the prepared hole Sh by the wedge action. In this case, the second bolt part 240 causes the male screw 244 to protrude from the floor Fm after the completion of driving. Thereafter, the fixed object Kmp, which is thinner than the protruding length of the second bolt part 240, is set on the post-installed anchor bolt 220, and the fixed object Kmp can be fixed to the floor Fm by using a nut and a washer.

  As described above, the post-construction anchor bolt 220 shown in FIG. 18 is also a bolt having a shaft material shape that has undergone a cutting operation of a single circular shaft material Sb, but is made into a one-piece product and then into the pilot hole. In addition to being easy to handle when mounting and fixing, the manufacturing process can also be simplified. Moreover, the post-construction anchor bolt 220 having a new shape having a shaft shape can be provided, and the application can be expanded.

  As mentioned above, although the embodiment of the present invention has been described in the embodiments, the present invention is not limited to the above-described embodiments and modifications, and can be implemented in various modes without departing from the gist thereof. Is possible. For example, the post-installed anchor bolt 20 shown in FIGS. 1 to 3 is press-forged using the fixed forging die KKs and the drive forging die KKm, but the circular shaft member Sb is formed with a mating die as shown in FIG. It can also be formed by press forging.

  Further, the post-construction anchor bolt 120 and the post-construction anchor bolt 220 are formed from the single circular shaft material Sb through the press forging or incision process as described above. However, the post-construction anchor bolt 120 and the post-construction anchor bolt 220 have a polygonal cross section instead of the circular shaft material Sb. It can also be formed by subjecting the shaft material to press forging or cutting. In addition, as for the post-installed anchor bolt 120, the first bolt portion 130 has the tapered portion 132 and the second bolt portion 140 is changed to the tapered portion 142 by a shaping process involving cutting using a grinder, a grindstone, or the like. It is also possible to have both bolt parts connected by the connecting part 150 at the bolt tip 141.

  By the way, in the post-construction anchor bolts 20, 120, and 220 after each of the above-described embodiments, these were obtained through the shaping process of the metal pipe material P or the circular shaft material Sb. As mentioned above, each post-installed anchor bolt can be formed. In this way, post-installed anchor bolts obtained from engineer plastics have the same shape as each of the post-installed anchor bolts described above, but the manufacturing method is changed from shaping to resin injection molding or extrusion molding. In addition, after the one-piece product made of engineer plastic, it is possible to obtain a construction anchor bolt by these mold forming processes.

DESCRIPTION OF SYMBOLS 20 ... Post-construction anchor bolt 30 ... 1st bolt part 32 ... Tapered part 40 ... 2nd bolt part 42 ... Bolt tip 44 ... Slit 45 ... Uneven part 46 ... Guide surface 47 ... Female screw 50 ... Connection part 120 ... Post-construction anchor Bolt 130 ... First bolt part 132 ... Tapered part 140 ... Second bolt part 141 ... Bolt tip 142 ... Tapered part 144 ... Male screw 150 ... Connection part 220 ... Post-installed anchor bolt 230 ... First bolt part 232 ... Tapered part 240 ... Second bolt part 242 ... Taper part 244 ... Male thread 250 ... Connecting part B ... Bolt Fm ... Floor HK1 ... First forging die HK2 ... Second forging die HK3 ... Shaft material holding die HK4 ... Incision forging die HK5 ... Holding mold HK6 ... Correction mold HKb ... Cavity part HKn ... Cutting blade J ... Driving jig K ... Fixed object KKm ... Drive forging die KKs ... Fixed forging die KP1 ... Press forging die portion KP2 ... Press forging die portion Kk ... Caulking trace Kmp ... Fixed object Kp1 ... Press forging die portion Kr ... Cavity part Lc ... Fixed channel Mp ... Fixed object Steel plate NT ... Nut P ... Pipe material Pk ... Pressing metal fitting SB ... Dimensional bolt SE ... Pressing blade part SK1 ... First core die SK2 ... Second core die SKd ... Slit forming forging lower die SKu ... Slit forming forging upper Type SP1 ... Core type part SP2 ... Core type part SS ... Shaft material Sb ... Circular shaft material Sh ... Pilot hole T1 ... First convex strip T2 ... Second convex strip TS ... Steel frame material W ... Washer

Claims (10)

It is a post-installed anchor bolt that is fixed in the pilot hole,
A bottom side portion having an inclined surface that is inclined with respect to the pilot hole, is located on the bottom side of the pilot hole and enters the pilot hole;
It is located on the pilot hole opening side and enters the pilot hole, and includes an opening side portion that descends in the pilot hole by receiving driving toward the pilot hole bottom side,
The opening side portion is
It has a joint surface from the front end part that joins with the inclined surface of the bottom side part part as it descends and presses the peripheral wall of the pilot hole from the front end part, and before receiving the driving, the front end part In the continuous portion in the unit with the bottom side portion,
The connecting portion is
When forming the bottom side part and the opening side part by subjecting a single metal material to a shaping process, the bottom part is formed at the tip part along with the shaping process in a state that can be broken by the driving. A post-installed anchor bolt formed by connecting the side part and the opening side part. The post-construction anchor bolt according to claim 1,
The bottom side part and the opening side part are formed by subjecting a single pipe material to the shaping process,
The bottom side portion is formed through the shaping process in which the pipe material is reduced in diameter to a tapered shape on the opening side portion, and the outer peripheral wall surface of the tapered pipe material is the inclined surface. age,
The opening-side portion is formed through the shaping process in which a plurality of slits extending in the axial direction from the tip portion are left on the outer wall of the pipe member around the pipe member peripheral wall, and the inner peripheral wall surface of the pipe member is formed on the inner peripheral wall surface of the pipe member. As a joint surface,
The continuous portion connects the small diameter side of the tapered bottom side portion to the opening side portion at the distal end portion with the shaping process,
The opening side portion is
Upon receiving the driving, the lowering is caused by breaking the continuous portion, and the joining surface is joined to the tapered inclined surface of the bottom side portion portion with the lowering. The post-construction anchor bolt that exerts the wedge action of causing the tip portion to bite into the peripheral wall of the pilot hole through expansion of the slit.   The bottom side part and the opening side part are formed through press forging as the shaping process, and the connecting part is the tapered bottom side part at the tip part accompanying the press forging. The post-construction anchor bolt according to claim 2, wherein a small diameter side of the portion is connected to the opening side portion.   The post-installed anchor bolt according to claim 2 or 3, wherein the opening side portion has a shaft material gripped on the side of the pilot hole opening.   The said opening side site | part part has the some annular recessed part and annular convex part which cross | intersect the said slit through the said press forging, The post-construction in any one of Claim 3 or Claim 4 surrounding the said pipe material surrounding wall Anchor bolt. The post-construction anchor bolt according to claim 1,
The bottom side part and the opening side part are formed by subjecting a single shaft material to the shaping process,
The bottom side portion is provided with an end on the bottom side of the pilot hole in the shape of the shaft material, and the inclined surface is extended from the end,
The opening side portion is provided with an end portion on the pilot hole opening side in the shape of the shaft material, and the joining surface extends from the end portion side to the tip portion.
The connecting part connects the bottom side part to the opening side part at the tip part,
The opening side portion is
Upon receiving the driving, the lowering is caused through the breaking of the connecting portion, and the joining surface is joined to the inclined surface of the bottom side portion portion along with the lowering to exert the wedge action. Anchor bolt. The post-construction anchor bolt according to claim 6,
The bottom side part and the opening side part are formed by pressing forging as the shaping process,
The bottom side portion has a cross section in which the shaft material is crushed in the diametrical direction and is surrounded by a flat surface and an outer peripheral wall surface of the shaft material, and the portion to be the cross section is from the opening side portion portion side. Continuing over the formation range of the inclined surface, the degree of crushing is formed through the pressing forging gradually decreasing from the opening side portion portion side in the formation range of the inclined surface, over the formation range of the inclined surface The continuous plane is the inclined surface,
The opening side portion has a cross section in which the shaft material is crushed in the diametrical direction opposite to the bottom side portion and is surrounded by a flat surface and the outer peripheral wall surface of the shaft material, and the portion that becomes the cross section The joint surface is formed through the press forging, which continues from the tip portion side over the joint surface formation range, and the degree of crushing gradually decreases from the tip portion side in the joint surface formation range, The plane that is continuous over the formation range is the joining surface,
The said connection part connects the edge part of the said bottom side site | part part to the said opening side site | part part in the said front-end | tip part with the said press forge.   The post-construction anchor bolt according to claim 7, wherein the bottom side portion and the opening side portion are formed by subjecting a single circular shaft member to the press forging. The post-construction anchor bolt according to claim 6,
The bottom side part and the opening side part are formed by performing the shaping process as an incision process in which a single shaft material is obliquely incised leaving a part of the outer peripheral wall part,
The bottom side portion has the cut surface as the joint surface,
The opening side portion has the other surface that has been incised as the joining surface,
The continuous portion connects the bottom side portion to the opening side portion at the part of the shaft material outer peripheral wall remaining at the distal end portion with the incision process,
The opening side portion is
Upon receiving the driving, the lowering is caused through the breaking of the connecting portion, and the joining surface is joined to the inclined surface of the bottom side portion portion along with the lowering to exert the wedge action. Anchor bolt.   The post-construction anchor bolt according to claim 9, wherein the bottom side portion and the opening side portion are formed by subjecting a single circular shaft member to the incision process.

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