JPH11270534A - Anchor metal fitting for concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anchor metal fitting for concrete of a new structure having excellent fixing workability and fixing performance in a concrete skeleton drill hole especially, in relation to the anchor metal fitting for concrete. SOLUTION: A supporting shoulder part is arranged as a metal fitting main body on a boundary part between a screw receiving body part 2 and a fitting cylindrical part 3, an operating pin 5 formed as a wedge acting part whose tip end is formed in a conical shape is inserted and mounted in a fixing cylindrical part sheath hole 33 of the metal fitting main body from the tip end side of the operating pin 5, a terminal end of the operating pin 5 is locked by a push cover piece 6 on which a thin wall part is formed for bending and deforming the terminal end of the operating pin 5 so as to be a surely engaging condition such as a claw of a ratchet in a screw space part female screw 22 of the screw receiving body part 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

SUMMARY OF THE INVENTION The present invention relates to a metal fitting for use when a female screw portion for fixing is formed at an appropriate position on the surface of a concrete skeleton, and more particularly, to expand a fixing cylinder at a hole for drilling a concrete skeleton. It is an object of the present invention to provide a concrete anchor having a novel structure so that an action pin that performs a function can be stably inserted and mounted in a sheath hole of a fixing cylinder.

[0002]

2. Description of the Related Art In Japan, which has been undergoing tremendous economic development, it has begun to fade due to various factors, and there is no longer a disposable construction rush that can be broken down and built. In the case of long concrete structures, as in the past, wasteful phenomena such as being easily demolished while maintaining a long service life have been stopped, and in the future, the building structure will be used as it is, and It is anticipated that there will be a tendency to replace and renovate only the simplified equipment structure and features at an appropriate time to reduce the economic burden as much as possible.

[0003] Apart from such a tendency, a systematic construction of various structures aimed at expanding domestic demand and realizing a more comfortable living space has been regarded as an indispensable measure for the future. The construction of new structures suitable for those purposes is expected to increase, but never decrease, and these new structures that will be planned in the future will have limited equipment life. It is anticipated that parts and interior and exterior parts that are influenced by changes in lifestyle and social demands will be introduced with measures that allow them to be easily removed and replaced from the concrete skeleton.

[0004] As a means for attaching and removing various materials in a concrete structure, if the mounting position is determined in advance and there is no plan to change, various insert fittings such as cast inserts and iron inserts are used as concrete molds. Temporarily attached to the frame surface, after concrete casting and curing, since the attachment parts of these inserts are exposed on the concrete surface from which the mold has been removed, the predetermined connection metal fittings are screwed or By fitting, it is possible to reliably fix various materials that are expected.

[0005] However, as described above, there are various types of concrete structures, such as a case where an existing concrete structure is to be repaired and used, a case where a future change is predicted in advance, and a structure where a new purpose is suddenly generated. When fixing the material, unlike the case where the base is wooden, etc., it cannot be easily fixed with nails or screws, etc.
Special post-installation measures are required to fit the concrete substrate.

The most common means for retrofitting various materials to the concrete foundation is to drill a vertical hole having a predetermined depth and diameter at a desired position with a special drill and insert a concrete anchor having an expansion plug structure. Then, the action pin is driven in to forcibly push the expansion plug structure part in the depth of the vertical hole to make it penetrate into the concrete, and to form an inverted wedge structure, fix the anchor at a predetermined location in the concrete, and separate it into the threaded part. Male screws or metal fittings with external threads are screwed together and suspended or fixed.

The conventional concrete anchor, in particular, the anchor A of the type in which the female screw side is fixed to the concrete skeleton C side later, is provided at the distal end side of the female screwed cylindrical metal concrete a1 (with female screw cut). On the opposite side)
The cuts a2, a2,... Are formed in a cross shape on a plane passing through the axis, the same side is divided into four parts, and a wedge piece a3 is attached to the opening on the four divided side, as shown in FIG. The main structure is as follows, and the anchor A is inserted into the vertical hole c1 of the concrete skeleton C side drilled by a special drill from the side of the wedge piece a3 to protrude from the surface of the concrete skeleton C. That is, by strongly hitting the end of the cylindrical metal fitting body a1 on the female threaded side with a hammer or the like, and pushing the cylindrical metal fitting body a1, the wedge piece a3 relatively supported by the inner part of the vertical hole c1. Is forced into the cylindrical metal body a1 to forcibly expand the four-part divided portion of the cylindrical metal body a1 to be spread within the vertical hole c1 on the four-divided side of the cylindrical metal body a1. Inverted wedge structure as shown in FIG. Achieved, the concrete anchor A were those to be fixed to the concrete skeleton C desired location.

However, in the case of the concrete anchor A, which has been widely used in the past, the difference in the depth of the vertical hole c1 drilled on the concrete skeleton C side causes the anchor A cylindrical fitting main body a1 from the surface of the concrete skeleton C to differ. There is a possibility that the degree of protrusion may be changed (in some cases, it may be hidden in the vertical hole c1), and above all, if the vertical hole c1 is not set to the optimum depth, the degree of entry of the wedge piece a3 will differ, If it is too deep, the cylindrical fitting body a1 in the vertical hole c1
The reverse wedge structure is incomplete, so that sufficient fixing strength cannot be obtained, and it may come out after mounting the material and cause an unexpected situation, or on the contrary, it is too shallow Then, in order to align the end of the cylindrical metal body a1 with the surface of the concrete skeleton C, beating it too hard with a hammer or the like will deform the female threaded end, thereby hindering the subsequent screwing operation of the male screw. In the process, the wedge piece a3 destroys the concrete at the back of the vertical hole, concrete dust spills out through the hollow portion of the tubular metal fitting body a1, and the work environment is deteriorated. During the manufacturing process, the wedge piece a3 has a troublesome temporary attachment to the tubular metal fitting body a1 and has a troublesome problem such as dropping or loss of the wedge piece a3 in a distribution stage or the like.

The present invention has been made in view of the above situation of a concrete anchor as described above, and it is not necessary to be nervous at the depth of a vertical hole at a desired location of a concrete skeleton unless the depth becomes shallow, The problems of the prior art, such as minimizing the dissipation of dust etc. as much as possible, simplifying the anchor manufacturing process as much as possible, and avoiding waste as metal fittings due to dropping or loss of wedge pieces, etc., are set as issues and solved all of them. As a result of continuing intensive development and research aiming at the realization of an anchor that can be realized, we have finally completed a concrete anchor fitting with a new structure that can finally achieve the intended purpose, and also aim to commercialize it. In the following, while exemplifying a typical example, the concrete anchor metal fittings of the present invention will be described. Formation is to be gradually added in the detailed description can fully understand.

[0010]

As will be readily understood from the embodiments shown in the drawings, the concrete anchor of the present invention is constructed as follows.
It basically consists of the following configuration. That is, the sheath hole around the axis of the fixing cylinder body inserted into the perforated hole of the concrete body is formed in a shape having an inclined inner wall portion at the back thereof, and the fixing hole including the inclined inner wall portion is formed. The appropriate portion of the fixing cylinder portion is formed into a half-cut shape or a quadruple shape at a position passing through the axis from the outside of the tip to the appropriate range on the tip side, and fits within the same plane passing through the axis in a predetermined range portion on the tip side of the fixing cylinder portion. Book or 4
On the other hand, it is assumed that a cut portion of the book is formed, and a screw receiving body portion having a female threaded screwing space portion is integrally formed concentrically on the entrance side of the sheath hole portion of the fixing cylindrical body portion. In addition to the fitting main body, a round bar-shaped working pin having a tip abutting and slidable on the inclined inner wall portion of the sheath hole portion and having a length equal to or greater than the depth dimension of the inclined inner wall portion is used. Inserting and mounting from the screw receiving body side of the bracket body to the tip of the fixing cylinder body sheath hole, and a thin section consisting of a balanced contour slightly larger than the screwing space diameter of the screw receiving body part, On the inside balanced from the contour, a push cover piece provided with a flat circular thin portion larger than the working pin diameter is set in a posture substantially orthogonal to the anchor main body axis, and the screwing space of the screw receiving body part Insert the end of the working pin to the end of the As a guide, the contour side portion bent to the opposite side to the insertion direction is engaged with the screwing space portion female screw like a ratchet claw, so that the end of the working pin is located in the screwing space portion of the anchor body screw receiving body portion. It is an anchor for concrete anchored at a predetermined position.

The metal fitting body is composed of a screw receiving portion and a fixing cylindrical portion, each of which is made of a steel material (in some cases, use of an industrial plastic or the like having properties comparable to the steel material can be considered).
The screw receiving body side is a part that protrudes from the surface of the concrete skeleton and performs the function of screwing a fixing screw or a hanging bolt, etc., from the opening end side. The inner peripheral wall of the screwing space portion is formed with a female screw thread and has a sufficient wall thickness enough to screw and support a fixing screw, a suspension bolt, and the like.

On the other hand, the fixing cylinder portion is integrally connected to the rear end of the screw receiving portion (the end opposite to the threaded opening end) and is embedded in the concrete body. This is a portion that functions to obtain a predetermined fixing strength, and has an outer diameter smaller than the outer diameter of the screw receiving portion, is used as a predetermined length, that is, is used as an anchor, and has an inverted wedge structure in a vertical hole of the concrete body ( A structure that spreads deeper into the hole and cuts into the surrounding wall to prevent it from slipping out), and a non-slip portion formed on the outer surface on the tip side increases the frictional resistance of the vertical hole with concrete. It is formed into a cylindrical shape or a bag structure (a structure in which the end opposite to the side connected to the screw receiving body portion is closed) having a length necessary to obtain a predetermined fixing strength. And a sheath hole around its internal axis It is formed that at the entrance side becomes communicated with the screwing space of the screw receiving body.

Further, the fixing cylinder has a conical shape (a shape that becomes sharper toward the back) formed at the end of the sheath hole, and is formed on the inclined inner wall portion. An appropriate range including the inner wall portion is formed into a half-cut shape or a four-part shape at a position passing through the axis from the tip (in the case of a cylindrical shape) or the bottom (in the case of a bag structure) from the outside, and a predetermined range on the bottom and / or the end portion of the cylindrical portion In this portion, two or four cuts that fit in the same plane passing through the axis are formed. Therefore, through the cuts, the space of the sheath hole is defined by a predetermined range on the distal end side of the cylindrical portion. The portion is also open to the outside.

The outer surface of the fixing cylinder portion within a predetermined range on the distal end side of the cylinder portion realizes an inverted wedge structure to increase frictional resistance between the fixing surface and the concrete surface when strongly pressed against the concrete. In order to increase the fixing strength even a little, it should be formed in a non-slip processed portion having an irregular shape such as a groove or a projection. The metal fitting body thus formed has a step formed at a boundary portion between the fixing cylinder and the screw receiving body, and has a vertical hole into which only the fixing cylinder can be inserted. As a supporting shoulder, it comes into contact with the surface of the concrete skeleton, and at the time of driving of a working pin, which will be described later, it has a function of supporting the external driving force.

The working pin is forcibly pushed into the above-mentioned sheath hole of the fixing body fixing cylinder, thereby expanding the end of the notched fixing cylinder at the tip end thereof. The main part is a thin round rod shape that can be inserted into the sheath hole of the above-described metal fitting main body fixing cylinder body portion, preferably, the inside of the sheath hole portion. A thin round rod shaped substantially inscribed in the peripheral wall, the tip of which is formed in a conical wedge action portion, and the length of the round bar-shaped portion excluding the wedge action portion is the total length of the fixing cylinder body sheath hole. The above-mentioned components are assembled in a state of being inserted into and attached to the sheath hole of the metal fitting main body from the front end side.

As a result, the end of the working pin assembled with the metal fitting body in this state, that is, the end side opposite to the wedge action portion, protrudes from the fixing cylindrical body sheath hole and partially extends. The screw receiving body has a projecting shape on the screwing space side, and the end of the working pin is hooked by a push lid piece engaged with the screwing space portion female screw of the metal fitting body screw receiving body. In this way, the function pin is reliably prevented from falling off from the metal fitting body, and functions to prevent the concrete dust from escaping from the threaded space during the operation pin driving operation.

The cover piece is made of a plastic thin plate or aluminum foil,
A thin sheet of paper or other suitable material is cut and formed into a flat shape, such as a circle, polygon, star, petal, etc., slightly larger than the diameter of the threaded space of the screw receiving body of the bracket body. At the same time, a thin portion formed into a flat circular shape larger than the diameter of the working pin is engraved at a position balanced from the center inside a predetermined range from the contour and formed as described above. , Insert the working pin into the bracket body,
After installation, by pushing in from the entrance side of the screw receiving body part screwing space part so as to be orthogonal to the axis,
In the process, the entire outer contour side portion from the thin portion is naturally bent in the opposite direction to the pushing operation direction, and the entire contour portion or a necessary portion is formed into a concave and convex shape of the female screw of the screw receiving space portion of the screw receiving body portion. A push cover that is pushed in while being abutted, and finally comes into contact with the uneven shape of the female screw in the threaded space portion with the center part pushed into the position where it abuts the end of the working pin One peripheral edge is engaged with the threaded space female screw (that is,
As in the case of a ratchet claw, movement in the opposite direction is prevented), and its position is temporarily attached in the screwing space, and as a result, the end of the working pin is supported.

In order to facilitate the pushing operation of the push lid piece into the screwing space portion in a posture perpendicular to the axis of the metal fitting body, a pushing operation hole is formed at the center portion thereof. It is extremely convenient because the jig is fitted into the pushing operation hole, and the purpose can be reliably achieved by a simple operation of pushing the fitting portion in alignment with the axis. It can be. Hereinafter, the structure of the concrete anchor according to the present invention will be specifically described with respect to an embodiment representative of the present invention so that the structure of the concrete anchor according to the present invention can be more clearly understood.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The concrete anchor shown in the exploded perspective view of FIG. 1, the vertical sectional view of only the metal fitting body of FIG. 2, and the overall vertical sectional view of FIG. 3 is the most typical structure having the structure of the present invention. 3/8 screw diameter commonly used in construction such as suspension of eaves ceiling of concrete structure skeleton, wiring and plumbing work, sprinkler installation, ceiling equipment cooler installation, etc.
A concrete anchor capable of screwing an inch bolt or a suspension bolt will be described. First, the metal fitting body 1 is attached to a screw receiving body 2 having an outer diameter of 12 mm and a length of 23 mm, and an outer diameter of 7.1 mm. Is made of a steel material having a total length of 58 mm and integrally formed with a fixing cylinder 3 having a length of 35 mm, and a spiral is formed on the outer peripheral surface over a range of about 12 mm on the terminal side of the fixing cylinder 3. A non-slip processing portion 36 is formed by the groove, and a support shoulder portion 4 of about 2.5 mm is formed at the boundary between the screw receiving portion 2 and the fixing cylinder portion 3 over the entire circumference. It is a structure that is made.

As shown in the vertical cross-sectional view of FIG. 2, the screw receiving body 2 has a threaded space 2 having a diameter of about 8.5 mm from its opening side.
1 is threaded to form a female screw portion 22 over a range of approximately 14 mm toward the back of the fixing cylinder portion 3.
Has a bag structure composed of a cylindrical portion 31 and a bottom portion 32, and a sheath hole portion 33 communicating with the screwing space portion 21 of the screw receiving body portion 2 is formed inside the bag structure at a deep portion (inside the bottom portion 32). A hole having a hole diameter of about 3.5 mm is drilled until about 10 mm is left (about 25 mm from the depth of the screw space 21), and an inclined inner wall portion 34 is formed in a range of about 8 mm in the depth. And about 1 from the outer center of the bottom 32 according to the axis.
By forming a half-cut shape with a depth of 5 mm, a cut portion 35 that fits in the same plane passing through the axis is formed.

As shown in the exploded perspective view of FIG. 1, the working pin 5 has an outer diameter of about 3.3 mm, which can be inserted into the sheath hole 33 substantially in an inscribed manner, and has a total length. A thin round steel rod of about 46 mm, the range of about 8 mm on the tip side is
It is a structure formed in the wedge action portion 51 by being cut off into a cone shape having an angle corresponding to the inclination of the inner wall portion 34 at the back of the back or an angle slightly larger than that, and the tip side, that is, the wedge action. Screwing space 2 of the screw receiving body 2 from the side where the portion 51 is formed
1 and inserted to the inner part of the sheath hole 33 and attached.

Thereafter, FIG.
As shown in the enlarged central vertical cross-sectional view of FIG. 5, the head of the working pin 5 (the end opposite to the end on which the wedge action part 51 is formed) is brought into contact with the working pin 5 so as to have a sheath hole. Push cover piece 6 that has a function of maintaining a state of being housed in part 33 as specified.
As shown in the perspective view of FIG. 5, is inserted into the threaded space portion 21 of the screw receiving body portion 2, and the peripheral edge thereof is
In order to be supported by the working pin 4, a circular shape having an outer periphery of about φ10 mm, which is slightly larger than the diameter of the screwing space 21 of 8.5 mm, is formed, and slightly inside the outer periphery. Thickness, about φ larger than 3.3 mm
A thin-walled portion 61 having a flat circular shape of about 7 mm is engraved concentrically, and in the center thereof, the diameter of the working pin 4, that is, about φ2.5 mm having a diameter smaller than 3.3 mm, is provided. A pushing operation hole 62 is provided to facilitate the operation of inserting the pushing lid piece 6 into the screwing space 21. In this embodiment, the outline of the thin film piece 6 is circular. However, as long as the overall outline is balanced, the thin film piece 6 may have a polygonal shape such as a quadrangle, a star shape, a petal shape, or a shape with jagged edges. And the like.

[0023]

[Operation] The concrete anchor of the present invention having the above-described structure is firstly provided with a special drill D at a desired portion of a concrete frame C as shown in FIG. 6. The smallest drill diameter that can be inserted
After drilling a vertical hole c1 having a depth of 5 mm or more and 35 mm or more, for example, 40 mm or more, it is inserted from the fixing cylinder 3 and, as shown in the sectional view of FIG.
Is inserted into the jig T with a hammer or the like (not shown).
Bang.

Then, the impact causes the entire metal fitting body 1 to receive a strong force toward the depth of the vertical hole c1, but the support shoulder 4 formed at the boundary between the screw receiving body 2 and the fixing cylinder 3 is formed.
However, as a result of being supported on the surface of the concrete skeleton C at the entrance portion of the vertical hole c1, the force directed toward the depth of the vertical hole c1 becomes an impact on the head of the action pin 5 directly through the thin film piece 6 through the driving jig T. The wedge action portion 5 at the tip of the action pin 5
1 is forcibly advanced along the inclined inner wall portion 34 of the fixing cylindrical body portion 3 sheath hole portion 33, and performs a wedge action in which the tip breaks into the cut portion 35, and by this action, the fixing half-cut is performed. The distal end side of the tubular member 3 is forcibly pushed right and left, and the outer surface of the same portion is deformed so as to bite into the inner peripheral surface of the vertical hole c1, and as shown in the sectional view of FIG. After realizing the wedge structure, the anti-slipping portion 36 on the outer surface of the tip end of the fixing cylinder 3 acts to increase the frictional resistance with the vertical hole c1, so that the concrete anchor C desired portion of the concrete anchor according to the present invention is provided. Fixing to is completed. After that, a stable fixing state is realized by screwing the fixing bolt or the suspension bolt 7 of the material to be attached to the female screw portion 22 threaded in the screw receiving body portion 2 screwing space portion 21.

In the construction process for realizing the inverted wedge structure in the vertical hole c1, even if the working pin 5 is in the provisional vertical position, the head is reliably supported by the push cover piece 6 and comes off and hinders the work. Further, when the cover lid piece 6 is pushed in the direction as indicated by the arrow in FIG. 5, the outer peripheral edge of the outer side of the thin-walled portion 61 becomes an arrow as shown in FIG. 4 is naturally bent in the opposite direction, and as shown in the main portion enlarged central longitudinal sectional view of FIG.
2, while moving into the screwing space 21 further with the advance of the driving jig T, while maintaining a latching structure like a ratchet claw as an abutting state, and continuously maintaining the horizontal state. The reverse wedge structure forming process is performed by two functions, that is, the function of completely closing the screwing space portion 21 and the function of making the entrance of the vertical hole c1 closed with the support shoulder portion 4 in close contact. The dust generated in the vertical hole c1 is prevented from escaping to the outside as much as possible.

Further, the pushing operation hole 62 provided in advance in the thin film piece 6 can be positioned only by preparing a special jig having a tip shape to be fitted into the pushing operation hole 62 in the concrete anchor manufacturing process of the present invention. To facilitate the control of the machine, and to serve as a part that enables removal by inserting a sharp tool even in the replacement operation when the posture is not correctly set for some reason, and to increase the manufacturing efficiency. Is a part that contributes to

[0027]

According to the concrete anchor of the present invention having the above-described structure, the metal fitting body has a structure in which a supporting shoulder is formed at a boundary between the screw receiving body and the fixing cylinder. As long as it is not shallower than the length of the fixing cylinder, it is possible to carry out drilling work without worrying about the depth of the vertical hole to the desired location of the concrete frame. It is possible to realize the reverse wedge structure, which can minimize the generation of dust in the vertical hole, and to make the entrance of the vertical hole closed,
In addition, the addition of a structure in which the screw receiving body part screwing space part is closed by the lid part prevents the dissipation of concrete dust during work as much as possible, so it is extremely excellent in improving work efficiency It has the characteristics that have been demonstrated.

Also, the inclination angle of the wedge action portion at the tip of the working pin is substantially equal to or slightly larger than the inclined inner wall portion of the fixing cylinder body sheath hole portion, and is formed in a cone shape having a slightly larger angle.
Smooth interruption guided by the inclination angle of the inner wall part at the back of the sheath hole is guaranteed, it is possible to realize an inverted wedge structure with relatively light hitting operation, and the anti-slip processing part reduces friction resistance with the vertical hole. A secure temporary attachment structure that ensures that the working pins do not fall off or are lost even if the working pins are placed vertically downward, such as when working on ceiling slabs, etc. In addition to having such a feature that it will be very useful in improving the above-mentioned work efficiency, a complicated process of hammering and fixing a wedge piece in the anchor manufacturing process is not required, and By simply attaching the lid piece, it is possible to easily and reliably manufacture the anchor that prevents the working pin from coming out, and it is possible to reliably prevent the working pin from falling off and lost even in the subsequent handling stage as a product. There is also an advantage that the push cover piece is provided with a push-in operation hole in advance, which makes it extremely easy to attach the screw to the screw receiving body portion while controlling the posture. It can be expected to have the effect of being able to do so, and in addition to its practicality, it is excellent in terms of manufacturing and handling of products.

In particular, in the embodiment shown in the drawings, as a work of retrofitting various materials to desired portions of the surface of the concrete skeleton C, a structure almost ideal as a concrete anchor for bolts or suspension bolts of the most widely used size is used. The thin portion 61 of the lid 6
Is formed as the simplest structure that can be easily engraved and formed by a ring-shaped pressing die. In addition, the working pin 5 can be securely maintained in a temporarily attached state, and the screwing space 21 can be securely formed. It can be used as a metal fitting for general concrete structures where the concrete surface is directly exposed, as well as the concrete surface using the deck plate does not appear directly. As for metal fittings for slab structures, etc., compared with the diameter of the bolts and suspension bolts to be connected, the fixing cylinder 3 is thinner, so the work of drilling a vertical hole in the concrete skeleton C through a metal plate is compared. It is an excellent effect that can be easily implemented, which cannot be expected in the past.

As described above, the concrete anchor of the present invention enables the intended purpose to be universally achieved due to its characteristic structure, and, as in various industries, increases the efficiency in a severe economic environment. Even in the construction industry, where efficient work is required, improvements in various areas are required,
In particular, as one of the fixing and connecting means that facilitates installation and replacement of various materials for realizing a comfortable environment, it is highly evaluated not only for its structural strength but also for its practicality and economy. Is expected to be widely adopted and spread.

[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 main body.

FIG. 3 is a longitudinal sectional view of a state in which the whole is combined.

FIG. 4 is an enlarged central longitudinal sectional view of the main part.

FIG. 5 is an enlarged perspective view of a push cover piece inserted and attached to the fitting main body.

FIG. 6 is an enlarged perspective view showing a deformed state of the push cover piece at the stage of being inserted and attached to the fitting main body.

7 to 9 are longitudinal sectional views showing a typical process of a working process.

FIG. 10 is a side view of a conventional concrete anchor. .

FIG. 11 is a vertical cross-sectional view showing an identification attachment state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal fitting main body 2 Screw receiving part 21 Same threaded space part 22 Same female screw part 3 Fixing cylinder part 31 Same bottom part 32 Same cylinder part 33 Same sheath hole part 34 Same inclined inner wall part 35 Same cut part 36 Same slip prevention Working part 4 Support shoulder part 5 Working pin 51 Same wedge action part 6 Push lid piece 61 Same thin part 62 Same pushing operation hole 7 Hanging bolt A Previous concrete anchor a1 Same cylindrical metal concrete a2 Same cut a3 Same wedge piece C Concrete skeleton c1 Same vertical hole D Dedicated drill T Driving jig

Claims (2)

[Claims] 1. A fixing device according to claim 1, wherein a sheath hole around the axis of the fixing cylinder is inserted into a perforated hole of the concrete skeleton, and has a shape having an inclined inner wall in a deep portion thereof. A half-shape or quadrant is formed at a position passing through the axis from the outside of the tip up to an appropriate range on the tip end side of the fixing cylinder portion, and a predetermined range portion on the tip end side of the fixing cylinder portion within the same plane passing through the axis. Two or four notches that fit into the housing are formed, while a screw receiving body having a female threaded threaded space is concentric with the inlet side of the sheath hole of the fixing cylinder. In addition, the metal body is integrally formed into a shape, and the tip is formed in a shape capable of abutting and sliding on the inclined inner wall portion of the sheath hole portion, and is formed to have a length equal to or greater than the depth dimension of the inclined inner wall portion. Insert a round rod-shaped working pin from the screw receiving body side of the bracket body to the tip inside the fixing cylinder body sheath hole. A thin piece with a balanced contour slightly larger than the diameter of the screw-in space of the screw receiving body, and a flat circular thin wall with an inner diameter larger than the working pin diameter. The push cover piece provided with the part is inserted in a position substantially orthogonal to the axis of the anchor main body to the end of the previous working pin in the screwing space part of the screw receiving body part, and in the process, the thin part is inserted as a guide The contour side portion bent in the direction opposite to the direction is engaged with the threaded space female screw like a ratchet claw, so that the end of the working pin is at a predetermined position in the threaded space of the anchor body screw receiving body. An anchor for concrete, characterized in that it is hooked. 2. The concrete anchor according to claim 1, wherein the push cover piece has a push-in operation hole formed in a portion inside the thin portion.