JP3844593B2 - Anchor bracket for concrete - Google Patents

Description

[0001]
OBJECT OF THE INVENTION
TECHNICAL FIELD The present invention relates to a concrete metal fitting used when a fixing female thread portion is formed later at an appropriate position on a concrete frame surface, and in particular, an action pin that functions to expand a fixing cylinder portion in a concrete frame drilling hole. However, an object of the present invention is to provide a concrete anchor metal fitting having a novel structure that can be stably inserted and mounted in the sheath hole of the fixing cylinder.
[0002]
[Prior art]
Japan, which has continued tremendous economic development, has begun to be shaded by various factors, so there is no longer a disposable construction rush that can be destroyed and built, and a concrete structure with a long service life. In this case, as in the past, the useless phenomenon of being easily demolished while leaving the useful life for a considerable period of time will also be stopped. It is expected that there will be a tendency to reduce the economic burden as much as possible by exchanging and refurbishing only the structure part at an appropriate time.
[0003]
Apart from these trends, the planned construction of various structures aimed at expanding domestic demand and realizing a more comfortable living space is regarded as an indispensable measure for the future. The construction of new structures suitable for the purpose is expected to increase but never decrease, and in the new structures that will be planned in the future, the facility structure part with a limited useful life, The interior and exterior structure parts that are affected by changes in lifestyles and social demands, etc., are expected to be devised so that they can be easily removed and replaced from the concrete body parts.
[0004]
As a means of attaching and removing various materials in concrete structures, if the mounting position is determined in advance and there is no plan to change it, various insert fittings such as cast inserts and iron inserts are attached to the concrete formwork surface. Once the concrete is temporarily placed, cast and hardened, the mounting parts of these inserts are exposed on the concrete surface from which the formwork has been removed. By doing so, it is possible to securely fix various scheduled materials.
[0005]
However, if you are going to use an existing concrete structure as described above, or if you want to fix the material in a concrete structure that has been predicted for future changes, or a structure that suddenly has a new purpose, etc. In such a case, unlike the case where the base is made of wood or the like, it cannot be easily fixed with a nail or a screw, so that a special retrofit means suitable for the concrete base is required.
[0006]
The most common means for retrofitting various materials to the concrete base is to drill a vertical hole with a predetermined depth and diameter at a desired position with a dedicated drill, and then insert a concrete anchor having an expansion plug structure. A pin is driven to forcibly expand the expansion plug structure part at the back of the vertical hole and bite it into the concrete. The reverse wedge structure is used to fix the anchor at a specific location in the concrete. Alternatively, a male threaded fitting or the like is screwed and suspended or fixed.
[0007]
This conventional concrete anchor, in particular, the anchor A of the type in which the female screw side is fixed to the concrete housing C side later, is the tip side of the female threaded cylindrical metal a1 (opposite to the female threaded side). In the side), cuts a2, a2,... Are formed in a cross shape in a plane passing through the axis, the same side is divided into four parts, and a wedge piece a3 is attached to the opening part of the four parts. The structure as shown in FIG. 10 is the mainstream, and the anchor A is inserted from the side of the wedge piece a3 into the vertical hole c1 on the side of the concrete case C drilled with a dedicated drill, and is projected from the surface of the concrete case C. The head of the anchor A, that is, the end of the cylindrical metal fitting main body a1 on the side where the female thread is cut, is strongly struck with a hammer or the like, and the cylindrical metal fitting main body a1 is pushed in, so that the anchor A is relatively supported at the back of the vertical hole c1. Wedge 3 is pushed into the cylindrical metal fitting main body a1, forcibly expanding the four divided parts of the cylindrical metal fitting main body a1, and the four divided sides of the cylindrical metal fitting main body a1 in the vertical hole c1. In addition, the reverse wedge structure as shown in the longitudinal sectional view of FIG. 11 was realized, and the concrete anchor A was fixed to a desired position of the concrete frame C.
[0008]
However, in the case of the concrete anchor A that has been widely adopted from the past, due to the difference in the depth of the vertical hole c1 drilled to the concrete housing C side, the degree of protrusion of the anchor A cylindrical metal fitting body a1 from the surface of the concrete housing C is There is a risk that it will change (in some cases, it will be hidden in the vertical hole c1), and above all, if the vertical hole c1 is not made the optimum depth, there will be a difference in how the wedge piece a3 enters, which is too deep In such a case, the reverse wedge structure of the cylindrical metal fitting a1 in the vertical hole c1 becomes incomplete, so that sufficient fixing strength cannot be obtained, and it may come out after the material is attached, leading to an unexpected situation. The problem is that there is no problem, or conversely, it is too shallow and the end of the tubular metal fitting a1 is overstruck with a hammer or the like in an attempt to align the end of the cylindrical metal fitting a1 with the surface of the concrete case C It will cause a hindrance to the screwing operation of the male screw after deformation, and the wedge piece a3 will destroy the concrete in the back of the vertical hole in the process, and the concrete dust will spill through the hollow part of the cylindrical metal fitting body a1. In addition to the harmful effects of taking out and worsening the work environment, etc., the complexity of temporary attachment of the wedge piece a3 to the cylindrical bracket main body a1 in the anchor manufacturing process, the omission and loss of the wedge piece a3 at the distribution stage, etc. It has become a troublesome problem.
[0009]
In view of the situation of the conventional concrete anchor as described above, the present invention does not require that the depth of the vertical hole in the desired position of the concrete frame is nervous unless it becomes shallow, and dust etc. at the construction stage Anchors that can solve all of these problems, such as the ability to prevent the dissipation of metal as much as possible, the simplification of the anchor manufacturing process as much as possible, and the absence of waste as a metal fitting due to the dropping or losing of wedge pieces. As a result of continuing intensive development and research aimed at realization, we finally completed a new structure anchor anchor for concrete that can finally achieve the intended purpose, and its practical use is also remarkable However, in the following, the structure of the anchor fitting for concrete according to the present invention is sufficiently demonstrated while exemplifying typical examples. And that we added to the detailed description can grip.
[0010]
[Structure of the invention]
As can be easily understood from the embodiments shown in the drawings, the concrete anchor fitting of the present invention basically comprises the following configuration.
That is, the sheath hole around the axis of the fixing cylinder inserted into the drill hole of the concrete housing is formed in a shape having an inclined inner wall at the back, and the fixing including the inclined inner wall is performed. An appropriate range on the distal end side of the cylindrical body portion is formed in a half-cut shape or a quadrant shape at a position passing through the axial center from the outer side of the distal end, and fits within the same plane passing through the axial center at a predetermined range portion on the distal end side of the fixing cylinder portion. On the other hand, a screw receiving body portion having a threaded space portion that is internally threaded is integrally formed concentrically on the entrance side of the sheath hole portion of the fixing cylinder portion. In the shape of a metal fitting body, the tip is in a shape capable of abutting and rubbing against the inclined inner wall portion of the sheath hole portion, and a round bar-like shape formed with a length greater than the depth dimension of the inclined inner wall portion. Insert and install the action pin from the screw receiving body side of the metal fitting body to the tip of the fixing cylinder body sheath hole In addition, a thin piece with a balanced outline that is slightly larger than the diameter of the screw receiving space part of the screw receiving body part, and a flat circular thin part that is larger than the diameter of the working pin is formed on the inner side balanced from the outline. The provided cover piece is inserted in a substantially orthogonal posture to the anchor body axial center to the position of the distal end of the working pin in the screwing space portion of the screw receiving body portion, and in the process, the thin portion is guided as the insertion direction. The contour side portion bent to the opposite side is engaged with the internal thread of the threaded space portion like a ratchet claw, so that the end of the working pin is locked at a predetermined position in the threaded space portion of the anchor body screw receiving body portion. It is a concrete anchor metal fitting.
[0011]
The metal fitting body is composed of a screw receiving part and a fixing cylinder part, and is integrally formed with a steel material (in some cases, use of an industrial plastic having properties comparable to that of the steel material may be considered). The screw receiving body side protrudes from the surface of the concrete housing and serves as a part for screwing a fixing screw, a hanging bolt, etc. From the opening end side to the inner peripheral wall of the screwing space part After being cut, it is formed to have a sufficient thickness structure sufficient to screw and support a fixing screw, a hanging bolt, or the like.
[0012]
On the other hand, the fixing cylinder portion is integrally connected to the rear end side (the end portion opposite to the threaded opening end portion) of the screw receiving body portion, and is embedded in the concrete casing. This is a part that functions to obtain a predetermined fixing strength. It has an outer diameter smaller than the outer diameter of the screw receiving part and is used as a predetermined length, that is, as an anchor fitting. The anti-slip part formed on the outer surface of the tip side increases the frictional resistance with the concrete of the vertical hole part, It is formed in a cylindrical shape with a length necessary for obtaining fixing strength, or a bag structure (a structure in which the end opposite to the side connected to the screw receiving body portion is closed), and The sheath hole around the inner axis is on the entrance side It is formed made communicated with the screwing space of the screw receiving body.
[0013]
Further, the fixing cylindrical body portion is formed on the inclined inner wall portion with the shape of the hole on the end side of the sheath hole portion being a conical shape (a shape that sharpens toward the back), and the inclined inner wall portion is To the appropriate range including the tip (in the case of a cylindrical shape) or bottom (in the case of a bag structure), it is formed in a half-cut shape or a quadrant shape at a position passing through the axis from the outside, and at the bottom and / or the end portion side of the cylindrical portion, It is assumed that two or four notches that fit within the same plane passing through the shaft center are formed. Therefore, the space of the sheath hole portion is outside the predetermined range portion on the end side of the cylindrical portion through the notches. It will be in a state leading to.
[0014]
In addition, the outer surface of the cylinder end portion of the fixing cylinder portion within the predetermined range portion realizes an inverted wedge structure to increase the frictional resistance with the concrete surface when strongly pressed against the concrete, thereby fixing strength. In order to enhance even a little, it is formed on an appropriate non-slip processed portion made of an uneven shape such as a groove or a protrusion.
The metal fitting body formed in this way is formed with a step at the boundary between the fixing cylinder and the above-described screw receiving body, and is formed into a vertical hole into which only the fixing cylinder can be inserted. It becomes a supporting shoulder portion and comes into contact with the surface of the concrete frame, and fulfills the function of supporting the driving external force when the action pin described later is driven.
[0015]
The action pin is forcibly pushed into the sheath hole portion of the fixing body of the metal fitting body described above, so that the distal end side of the fixing cylinder portion having a cut is expanded at the tip, and a vertical hole is formed at that portion. It has a function of realizing a reverse wedge structure inside, and its main part is a thin round bar shape that can be inserted into the sheath hole part of the above-mentioned bracket main body fixing cylinder part. It is in the shape of a thin round bar that is inscribed, and the tip is formed in a conical wedge action part, and the length of the round bar part excluding the wedge action part is more than the total length of the fixing cylinder part sheath hole part They are combined in a state where they are inserted and mounted from the front end side into the sheath hole of the metal fitting body.
[0016]
As a result, the working pin combined with the metal fitting main body in this state is protruded from the end of the fixing cylinder body sheath hole part at the end, that is, the end side opposite to the wedge action part, and is partially a screw receiving body. By projecting to the screwing space part side of the part, the working pin end is hooked with a push lid piece engaged with the screwing space female screw of the metal fitting body screw receiving body part, The action pin is surely prevented from falling off from the metal fitting body, and the function of preventing the dissipation of the concrete dust from the screwing space during the action pin driving operation is performed.
[0017]
The cover piece is made of a plastic thin plate, aluminum foil, paper, or other suitable material, and is flat, slightly rounder, polygonal, star-shaped, petal-shaped, etc. And a thin-walled portion that is formed into a flat circular shape larger than the diameter of the previous working pin at a position balanced from the center inside the predetermined range from the contour. As described above, by inserting and installing the action pin into the metal fitting body as described above, by pushing it in from the entrance side of the screw receiving body part screwing space part so as to be orthogonal to the shaft center In the process, the entire outer contour side part from the thin wall part is naturally bent to the opposite side of the pushing operation direction, and the entire contour part or the necessary part is formed in the concave and convex shape of the screw space part of the screw receiving part. Press while being in contact with In the state where the center portion is finally pushed into a position where it abuts against the end of the working pin, the periphery of the presser cap piece that is in contact with the concavo-convex shape of the internal thread of the screwing space part is the screwing space. It is engaged with the internal female screw (that is, in a state where movement in the reverse direction is prevented, like a ratchet claw), and its position is temporarily attached in the screwing space, resulting in the end of the working pin being It is intended to support.
[0018]
In addition, in order to facilitate the pushing operation into the screwing space portion in a posture in which the pushing piece is perpendicular to the metal fitting body axis, if a pushing operation hole is formed in the central portion, the pushing lid piece A jig is fitted in the operation hole, and it is extremely convenient because the purpose can be reliably achieved by a simple operation of pushing the fitting part in alignment with the shaft center. Can do.
Hereinafter, the structure of the concrete anchor of the present invention will be described in detail with respect to an embodiment that represents the present invention so that the structure of the concrete anchor can be grasped more clearly.
[0019]
【Example】
The concrete anchor shown in the exploded perspective view of FIG. 1, the longitudinal cross-sectional view of only the metal fitting body of FIG. 2, and the overall longitudinal cross-sectional view of FIG. The concrete anchors that can be screwed with 3/8 inch screw diameter bolts or suspension bolts, which are commonly used for ceiling eaves, wiring and piping work, sprinkler attachment, ceiling equipment cooler attachment, etc. The metal fitting body 1 has a total length formed by integrally molding a fixing cylinder portion 3 having an outer diameter of 7.1 mm and a length of 35 mm on a screw receiving portion 2 having an outer diameter of 12 mm and a length of 23 mm. It is made of a 58 mm steel material, and a non-slip processed portion 36 by a spiral groove is formed on the outer peripheral surface over a range of about 12 mm on the end side of the fixing cylinder portion 3 and is fixed to the screw receiving portion 2. The boundary between the use cylindrical body portion 3 has a structure in which the supporting shoulder 4 of about 2.5mm along the entire circumference is formed.
[0020]
As shown in the longitudinal sectional view of FIG. 2, the screw receiving portion 2 is threaded over a range from the opening side to about 14 mm toward the back of the screwing space portion 21 having a diameter of about 8.5 mm. On the other hand, the fixing cylinder part 3 has a bag structure including a cylinder part 31 and a bottom part 32, and a sheath that communicates with the screwing space part 21 of the screw receiving part 2. The hole 33 is drilled as having a hole diameter of about 3.5 mm up to about 10 mm left in the back (inside the bottom 32) (about 25 mm from the back of the screwing space 21). A sloped inner wall 34 is provided in a range of about 8 mm at the back, and a cut that fits in the same plane passing through the shaft center is formed in a semi-cut shape with a depth of about 15 mm according to the shaft center from the outer center of the bottom 32. It is assumed that the portion 35 is formed.
[0021]
As shown in the exploded perspective view of FIG. 1, the working pin 5 has an outer diameter of about 3.3 mm and a total length of about 46 mm that can be inserted into the sheath hole 33 in a substantially inscribed manner. With a small round steel rod, the range of about 8mm on the tip side is cut into a cone shape with an angle corresponding to the inclination of the inclined inner wall 34 at the back of the sheath hole 33 or a slightly larger angle. In this structure, the wedge action part 51 is formed and inserted from the tip side, that is, the wedge action part 51 formation side, through the screwing space part 21 of the screw receiving body part 2 to the inner part of the sheath hole part 33 and attached. To do.
[0022]
After that, as shown in the central longitudinal sectional view of FIG. 3 and the enlarged central longitudinal sectional view of the main part of FIG. 4, the head of the working pin 5 (the end opposite to the end where the wedge action portion 51 is formed). 5, the push cap piece 6 that functions to hold the action pin 5 in the sheath hole portion 33 in a predetermined manner is provided on the screw receiving body portion as shown in the perspective view of FIG. 5. In order to be inserted into the two screwing space portions 21 and to be supported by the female screw portion 22, the outer peripheral edge is about φ10 mm slightly larger than the diameter of the screwing space portion 8.5 of 8.5 mm. In addition to being formed in a circular shape, a thin portion 61 having a planar circular shape with a thickness of about φ7 mm larger than the thickness of the action pin 4, that is, about 3.3 mm, is concentrically engraved slightly inside the outer peripheral edge. In addition, at the center, the thickness of the working pin 4 is about φ2.5 mm, which is a diameter smaller than 3.3 mm. The pushing operation hole 62 provided, are as to facilitate the insertion operation into the pressing lid piece 6 of screwing space portion 21.
In this embodiment, the outline of the thin film piece 6 is circular. However, as long as the overall outline is balanced, a polygonal shape such as a quadrilateral, a star shape, a petal shape, or a shape with a jagged shape on the entire circumference is used. It can also be a thing.
[0023]
[Operation]
As shown in FIG. 7, the concrete anchor of the present invention having the structure as described above can be inserted into the fixing cylinder portion 3 of the metal fitting body 1 with a dedicated drill D at a desired location of the concrete frame C. After drilling a vertical hole c1 having a minimum drill diameter of 7.5 mm and a depth of 35 mm or more, for example, 40 mm or more, it is inserted from the fixing cylinder portion 3 and, as shown in the sectional view of FIG. Is inserted into the head of the working pin 5 over the thin film piece 6, and the jig T is hit with a hammer (not shown).
[0024]
Then, the entire metal fitting body 1 is strongly subjected to the force toward the back of the vertical hole c1 by the impact, but the support shoulder portion 4 formed at the boundary portion between the screw receiving body portion 2 and the fixing cylinder portion 3 has the vertical hole. As a result of being supported on the surface of the concrete housing C at the entrance portion of c1, the force toward the back of the vertical hole c1 is transmitted as an impact to the head of the working pin 5 through the driving jig T as it is through the thin film piece 6, The wedge action part 51 at the tip of the action pin 5 is forced to advance along the inclined inner wall part 34 of the fixing cylinder part 3 sheath hole part 33, because the action of pushing only the action pin 5 is achieved. The tip acts as a wedge that breaks into the cut portion 35, and by this action, the tip side of the half-fixed fixing cylinder portion 3 is forcibly pushed to the left and right, and the outer surface of the same place is the inner periphery of the vertical hole c1. As shown in the cross-sectional view of FIG. In addition to realizing the reverse wedge structure in c1, the non-slip processed portion 36 on the outer surface of the fixing cylinder portion 3 acts to increase the frictional resistance with the vertical hole c1, and the concrete of the concrete anchor of the present invention Fixing to the desired location of the housing C is completed.
Thereafter, the fixing bolt or the suspension bolt 7 of the material to be attached is screwed into the female screw portion 22 threaded into the screw receiving body portion 2 screwing space portion 21, thereby realizing a stable fixing state.
[0025]
In the construction process for realizing the reverse wedge structure in the vertical hole c1, even if the action pin 5 is in the provisional vertical posture, the head is reliably supported by the cover piece 6 and falls off, which hinders the work. In addition, the pushing piece 6 is pushed in the direction shown by the arrow in FIG. 5 so that the outer peripheral edge side outside the thin-walled portion 61 is opposite to the arrow as shown in FIG. As shown in the enlarged central longitudinal cross-sectional view of the main part of FIG. 4, the peripheral edge thereof is in contact with the female screw part 22 to form a locking structure like a ratchet claw. While realizing, it moves further to the back of the screwing space portion 21 with the advancement of the driving jig T, and keeps the horizontal state, thereby making the screwing space portion 21 completely closed. And the entrance of the vertical hole c1 is due to the two actions that the support shoulder 4 is closed and closed. Dust in the longitudinal hole c1 generated by reverse wedge structure formation process, and thus to the utmost prevented dissipation to the outside.
[0026]
In addition, the push-in operation hole 62 provided in advance in the thin film piece 6 can be controlled in posture by only preparing a special tip-shaped jig that fits into the push-in operation hole 62 in the concrete anchor manufacturing process of the present invention. In addition to serving as a part that enables removal by inserting a pointed tool, even if the posture is not correctly stored for any reason, it contributes to increasing manufacturing efficiency. Part.
[0027]
[Effect]
The concrete anchor according to the present invention having the above-described configuration is such that the metal fitting body has a structure in which a support shoulder is formed at the boundary portion between the screw receiving body portion and the fixing cylinder portion, and the fixing cylinder body. Unless it becomes shallower than the length of the part, it is possible to carry out drilling work without worrying about the depth of the vertical hole in the desired location of the concrete frame, and the reverse wedge structure with the concrete frame surface as the support part, not inside the vertical hole It is possible to suppress the generation of dust in the vertical hole as much as possible, and the construction is such that the entrance of the vertical hole is closed, and the screw receiving body part screwing space part is closed. In addition to the configuration, the dissipation of concrete dust during work can be prevented as much as possible, so that it exhibits extremely excellent characteristics in improving work efficiency.
[0028]
In addition, the inclination angle of the wedge action portion at the tip of the action pin is substantially matched to the inclined inner wall portion of the fixing cylinder portion sheath hole portion, or is a slightly larger angle cone shape, and the sheath hole portion Smooth interruptions induced by the inclination angle of the inner wall part at the back are guaranteed, and a reverse wedge structure can be realized with a relatively light hitting operation, and the non-slip processed part increases the frictional resistance with the vertical hole and ensures It must have a secure temporary attachment structure that will never cause the working pin to fall off or be lost even if it is in a downward vertical position, such as when working on a ceiling slab, etc. The above-mentioned structure also has the feature that it will greatly help to improve the above-mentioned work efficiency, and does not require a complicated process of driving and fixing the wedge piece in the anchor manufacturing process. Easy and reliable operation with just mounting It is possible to manufacture an anchor that prevents the slipping out of the product, and there is also an advantage that it is possible to reliably prevent the working pin from falling out and losing in the handling stage as a product thereafter. The operation hole is provided, and it can be expected that the mounting operation to the screw receiving space portion while controlling the posture can be made very simple. Therefore, in addition to its practicality In terms of manufacturing and product handling, it is also excellent.
[0029]
In particular, in the example shown as an example, it is formed into a substantially ideal structure as a concrete anchor for bolts or suspension bolts of the most widely used size, as work for retrofitting various materials to a desired location on the surface of the concrete frame C. In addition, the thin-walled portion 61 of the presser cover piece 6 is also formed with the simplest structure that can be easily engraved and formed with a ring-shaped pressing mold, and the working pin 5 can be securely attached to the thin portion 61. As a metal fitting for a general concrete structure in which the concrete ground surface is directly exposed, it is possible to achieve a long-lasting and reliable realization of the screwed space 21. As a metal fitting for a slab structure where a concrete surface using a deck plate does not appear directly, the fixing cylinder part 3 is narrower than the diameter of the bolts and suspension bolts to be connected. From, vertical hole bored work on concrete skeleton C through a metal plate that is able to relatively simple to implement, and which is obtained Xiu the effect can not be expected to those of the past.
[0030]
As described above, the concrete anchor of the present invention makes it possible to achieve the intended purpose even from its characteristic configuration, and as various industries do, it becomes more and more efficient work in a severe economic environment. Even in the construction industry where improvement is required, improvements are required in various parts, especially as a means of fixing and connecting that facilitates the installation and replacement of various materials to realize a comfortable environment. It is expected that it will be widely adopted and popularized, not only because of its reliability in strength, but also in terms of practicality and economy.
[Brief description of the drawings]
The drawings show one embodiment representative of the present invention.
FIG. 1 is an exploded perspective view of a concrete anchor according to the present invention.
FIG. 2 is a longitudinal sectional view of only the metal fitting body.
FIG. 3 is a longitudinal sectional view of a state in which the entirety is combined.
FIG. 4 is an enlarged central longitudinal sectional view of the relevant part.
FIG. 5 is an enlarged perspective view of a pressing piece that is inserted into and attached to a metal fitting body.
FIG. 6 is an enlarged perspective view showing a deformed state when the push lid piece is inserted and attached to the metal fitting body.
FIGS. 7 to 9 are longitudinal sectional views showing a typical process of a work process.
FIG. 10 is a side view of a conventional concrete anchor. .
FIG. 11 is a longitudinal sectional view showing an identification wearing state.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Metal fitting body 2 Screw receiving part 21 Same screwing space part 22 Same female screw part 3 Fixing cylinder part 31 Same bottom part 32 Same cylindrical part 33 Same sheath hole part 34 Same inclined inner wall part 35 Same cut part 36 Same slip stopper Processing portion 4 Support shoulder portion 5 Working pin 51 Same wedge working portion 6 Push lid piece 61 Same thin portion 62 Same pushing operation hole 7 Suspension bolt A Previous concrete anchor a1 Same cylindrical metal a2 Same cut a3 Same wedge piece C Concrete frame c1 Same vertical hole D Dedicated drill T Driving jig

Claims (2)

The fixing cylinder including the inclined inner wall portion, in which the sheath hole portion around the axial center of the fixing cylinder portion inserted into the drilled hole of the concrete frame is formed in a shape having an inclined inner wall portion at the back thereof The body part tip side up to an appropriate range is formed in a semi-cut shape or a quadrant shape at the position passing through the axis from the tip outer side, and the two ends of the fixing cylinder part tip side on the same plane passing through the axis in the predetermined range part or It is assumed that four cut portions are formed. On the other hand, on the entrance side of the sheath hole portion of the fixing cylinder portion, a screw receiving body portion having a threaded space portion that is internally threaded is integrally formed concentrically. A round bar-shaped working pin whose tip is in contact with and rubbed with the inclined inner wall portion of the sheath hole portion and whose length is equal to or greater than the depth dimension of the inclined inner wall portion. Is inserted and attached from the screw receiving body side of the bracket body to the tip of the fixing cylinder body sheath hole. In addition, it is a thin piece with a balanced outline that is slightly larger than the diameter of the screw receiving space part of the screw receiving body part, and a flat circular thin part that is larger than the diameter of the working pin is provided on the inside balanced from the outline. Is inserted to the end of the working pin in the screw space of the screw receiving body in a substantially orthogonal posture to the anchor body axis, and in the process, the thin portion is guided and opposite to the insertion direction. The contour side portion bent to the side is meshed with the internal thread of the threaded space portion like a ratchet claw, so that the end of the working pin is hooked at a predetermined position in the threaded space portion of the anchor body screw receiving portion. An anchor fitting for concrete characterized by The concrete anchor fitting according to claim 1, wherein the pressing lid piece is formed with a pressing operation hole in a portion inside the thin portion.

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