JP2015083741A - Metal based anchor and seismic retrofitting method for structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide: a metal based anchor in which an elliptic opening of an enlarged diameter part of a bolt member enables strong pressing force on deep hole side walls of a structure and a favorable resin adhesive liquid flow; and a seismic retrofitting method for a structure using the metal based anchor.SOLUTION: In a metal based anchor, a bolt member 1 comprises an enlarged diameter part 2 and a thread part 4, and the enlarged diameter part 2 has a bottomed hole through a central axis thereof and slit grooves 3 equally dividing the enlarged diameter part 2. A taper part of a wedge-shaped member comprises a large-angle taper part and a small-angle taper part. A boundary between the enlarged diameter part 2 and the thread part 4 of the bolt member 1 has a ring-shaped thin wall part. Each of the slit grooves 3 has different lengths. The bottomed hole of the bolt member 1 has a receiving groove corresponding to the large-angle taper part of the taper part of the wedge-shaped member. The metal based anchor is used in combination with a resin adhesive based anchor. Also provided is a seismic retrofitting method for a structure using this metal based anchor.

Description

The present invention relates to a metal anchor for fixing a machine or an iron plate or the like by embedding a deep hole drilled in a strong structure such as concrete or bedrock together with an adhesive anchor, and a structure using the metal anchor This is related to the seismic reinforcement method.

In general, in order to fix metal anchors such as anchor bolts to structures such as concrete and bedrock, so-called post-installed anchors are first widely used. ing.
As the type of post-installed anchor, a metal anchor such as steel or stainless steel having an enlarged diameter portion in the embedded portion is inserted into a deep hole of a structure such as concrete previously drilled to a predetermined depth, and the impact strength of the impact Alternatively, the diameter-enlarged portion of the metal anchor is opened by rotating tightening, and the seismic reinforcement method for the structure using only the metal anchor, which is mechanically fixed by biting the metal anchor into the side wall of the deep hole, and this metal system After primary fixing with anchors, the adhesive is filled in the drill holes, and the bolts are installed, so that the adhesive enters the irregularities of the bolts and structures and hardens due to the chemical reaction of the adhesive anchors, and the entire fixing part is There are two types of seismic retrofitting methods that use an adhesive anchor that is chemically fixed. The present invention is a seismic reinforcement method using the latter adhesive anchor.

In the former seismic strengthening method combined with metal anchors, conventionally, steel or stainless steel bolts and wedge-shaped members are inserted into deep holes (bottom holes) drilled in the structure, and the wedge-shaped members are hit. In general, it is mechanically fixed primarily by opening diameter-enlarged portions provided at equal intervals on the bottom surface of the bottomed hole of the bolt, and the tip of the diameter-enlarged portion bites into the deep hole side wall of a structure such as concrete. It was the target. JIS standards for metal materials used for the metal anchor body include general structural rolled steel (G3101), polished steel bar (G3123), carbon steel pipe for mechanical structure (G3445), and the like.

However, since the pressing method is weak in the former method using only this metal-based anchor, the resin adhesive enclosed in the capsule is filled in the hole in conjunction with this primary fixing, and cured by a chemical reaction to cure the entire fixing part such as a bolt. The latter seismic retrofitting method was used in combination with the latter adhesive anchor that physically fixed the anchor. That is, it fixes by adhesive resin materials, such as an epoxy put in the deep hole (for example, refer Unexamined-Japanese-Patent No. 2010-19069 (patent document 1 mentioned later)).

A general construction procedure of the seismic reinforcement method using this adhesive anchor is a method as shown in FIGS.
(1) A deep hole is drilled in the structure, the inside of the deep hole is cleaned, and a capsule in which a fixed resin material such as epoxy is sealed is inserted into the deep hole (FIG. 3A).
(2) A metal anchor is placed and the top is hit (FIG. 3 (B)).
(5) By filling, the inside of the deep hole is filled with the fixed resin material, and the enlarged diameter portion of the bolt of the metal anchor is pressed against the side wall of the deep hole to cure and cure the resin material (FIG. 3C).
In addition, there is a full screw bolt etc. in the head of the bolt, and a nut is tightened according to this screw.

The latter seismic reinforcement method combined with this adhesive anchor is advantageous in terms of cost because the number of parts is very small. Moreover, the range which can open this metal-type anchor is decided by the kind of steel materials to be used. For this reason, generally the slit groove | channel of the same length divided | segmented 3-8 along the axial center from the front end surface of the bolt member which has a bottomed hole according to the maximum range which can be opened is cut.

On the other hand, as illustrated in FIGS. 4 to 6, the wedge-shaped member used for the metal-based anchor has a taper angle that aligns with the central portion of the concrete deep hole, or a through-hole bolt member. A flat-headed long nail-like one inserted in is used. When a wedge-shaped member is inserted into such a special through-hole bolt member, although not shown in the drawing, the enlarged diameter portion of the slit groove of the bolt member opens along the taper angle or slit groove width of the wedge-shaped member. (See FIG. 3C).

However, conventional bolt members in metal anchors have slit grooves of the same shape, so if the structure is hard, such as concrete, rock, etc., the tip of the bolt expanded portion is the deep hole side wall of the structure. The pressing force applied to the outer peripheral surface was distributed at equal intervals, and its use was limited. In other words, before the wedge-shaped member is completely inserted into the bolt member, the bolt expanded portion contacts the wall in the middle of the concrete deep hole due to an irregular opening, or stops in the middle, or in the case of a solid concrete wall or the like In some cases, the pressing force did not work well when the bolt enlarged diameter portions did not open evenly, and the bolt was not fixed firmly to the bottom wall of the concrete deep hole with four pressing forces. Therefore, when the bolt pull-out test is performed after the construction of the seismic reinforcement method combined with the adhesive anchor, concrete may be attached only to the upper end of the bolt, and the bolt member is exposed at the expanded diameter part of the lower end of the bolt. The pullout strength was low. For example, when the wedge-shaped member is not inserted straight, there is a defect that the slit grooves do not open at equal intervals, become an irregular, substantially rounded triangular shape, and do not bite into the concrete side wall.

In particular, in response to the collapse of the Isogo tunnel in Yamanashi Prefecture in December 2012, we have not been able to meet the demand for higher metal-based anchor pressure in the seismic reinforcement method combined with adhesive anchors. For this reason, in the case of ceiling boards in tunnels, etc. that are installed on structures such as highways that use both primary fixation and secondary fixation, cement strength is sufficient when adhesive anchors deteriorate due to long-term repeated slight vibrations. However, there is a risk that the pressing force of the metal anchor is insufficient.

On the other hand, the use of a stronger adhesive such as an epoxy resin was also examined, but the deterioration of the adhesive anchor was not avoided. Also, since the length and width of the slit groove are determined from the relationship of the bolt strength, the type of adhesive that can be applied is determined by the fluidity of the adhesive flowing through the slit groove, and the range of usable adhesives is also limited. there were.

JP 2010-19069 A JP 2004-263848 A

The present invention is characterized in that the widened portion of the bolt member is always deformed into a stable elliptical shape while the range in which the bolt member can be opened by striking the wedge-shaped member or the like maintains the same widening angle as the conventional one. . Thus, by deforming the enlarged diameter portion into an elliptical shape, the present invention can increase the pressing force applied to the outer peripheral surface of the deep hole side wall of the enlarged diameter portion at the tip of the bolt member, and the adhesive liquid. An object of the present invention is to provide a metal anchor that can improve the flow. Another object of the present invention is to provide a seismic reinforcement method for a structure in which a metal anchor having such a function is used in combination with an adhesive anchor. In addition, the present invention allows the wedge-shaped member to be temporarily caulked with the wedge-shaped member inserted and deformed into an elliptical shape so that the wedge-shaped member does not fall out of the bolt member while the metal-based anchor is being transferred, and can be operated as it is at the operation site. An object of the present invention is to provide a seismic reinforcement method for a structure that can be used in combination with an adhesive anchor.

Wedge member inserted into deep hole of structure such as metal anchor concrete used in combination with resin-bonded anchor for solving the problems of the present invention, bolt member fitted to the wedge member, and bolt member And a nut member that is fixed by screwing,
The wedge-shaped member consists of a guide bar part, a taper part and a striking bar part,
The bolt member is composed of an enlarged diameter portion and a screw portion, and the enlarged diameter portion has a bottomed hole penetrating the center axis and a metal anchor having a slit groove obtained by equally dividing the enlarged diameter portion.
(A) The tapered portion of the wedge-shaped member includes a large angle tapered portion and a small angle tapered portion,
(B) There is a ring-shaped thin portion at the boundary between the enlarged diameter portion of the bolt member and the screw portion,
(C) The slit groove has a different length.
And,
(D) The bottomed hole of the bolt member has a receiving groove corresponding to the large-angle tapered portion of the tapered portion of the wedge-shaped member.

Moreover, in the seismic reinforcement method for a structure for solving the problems of the present invention, an adhesive capsule is inserted into a deep hole of a structure such as concrete, and a guide rod portion, a taper portion, a striking rod portion, And a bolt member having a bottomed hole penetrating the enlarged diameter portion and a slit groove that equally divides the enlarged diameter portion. The upper part of the bolt member is fixed by opening the diameter-expanded part of the bolt member by striking force or rotary pressing, and secondary fixing by the adhesive of the broken adhesive capsule. In the seismic retrofitting method for structures that settle in deep holes,
(A) using the wedge-shaped member consisting of a large-angle taper portion and a small-angle taper portion in the taper portion of the wedge-shaped member;
And,
(B) There is a ring-shaped thin portion at the boundary between the enlarged diameter portion of the bolt member and the screw portion,
(C) The slit groove has a different length.
and,
(D) By using the bolt member having a receiving groove corresponding to the large-angle tapered portion of the tapered portion of the wedge-shaped member in the bottomed hole of the bolt member, the bolt is inserted into the deep hole of the structure such as the concrete. The diameter-expanded part of the member opens in an elliptical shape.

In addition, another structure seismic reinforcement method for solving the problems of the present invention is to insert an adhesive capsule into a deep hole of a structure such as concrete and hit the guide rod part, the taper part and the hammer from the upper part. A wedge-shaped member having a rod part, and a bolt member having a bottomed hole penetrating the enlarged diameter part and a slit groove obtained by equally dividing the enlarged diameter part, which is made up of an enlarged diameter part and a threaded part, are sequentially inserted, Next, the upper part of the bolt member is fixed by opening the diameter-expanded portion of the bolt member by striking force or rotary pressing, and is fixed secondarily by the adhesive of the damaged adhesive capsule and the like. In the seismic retrofitting method for structures that anchor inside deep holes in structures,
(A) preparing the wedge-shaped member consisting of a large-angle taper portion and a small-angle taper portion at the taper portion of the wedge-shaped member;
(B) There is a ring-shaped thin portion at the boundary between the enlarged diameter portion of the bolt member and the screw portion,
(C) The slit groove has different lengths, and
(D) By preparing the bolt member having a receiving groove corresponding to the large-angle taper portion of the tapered portion of the wedge-shaped member in the bottomed hole of the bolt member, and using a metal-based anchor in which both are temporarily crimped, The enlarged diameter portion of the bolt member opens in an elliptical shape in a deep hole of a structure such as concrete.

Here, the slit grooves having different lengths penetrate the ring-shaped thin portion in the case of a metal anchor having a small diameter such as 6 mm, 8 mm, 10 mm, or 12 mm. This is because the ring-shaped thin portion of the small-diameter bolt member has a small cross-sectional area and is vulnerable to mechanical stress, so that the end of the slit groove is avoided from being in the ring-shaped thin portion. On the other hand, such a problem does not occur in the case of a metal anchor having a large diameter of 16 mm or 20 mm, or in some cases 12 mm.

In addition, the bottomed hole of the bolt member is required to have a receiving groove corresponding to the large-angle tapered portion of the tapered portion of the wedge-shaped member. This is because the diameter-expanded portion of the member is opened at a stretch, and the hard concrete wall is firmly bitten. Therefore, a ring-shaped thin part was provided to determine the opening position, and the elliptical shape was specified by the difference in length between the slit grooves. The cone angle of the large-angle taper is preferably 85 to 95 °, and most preferably about 90 °.

The ring-shaped thin part includes an all-round ring, two ¼-rings facing each other, three ６-round rings arranged at equal intervals, and the like. The ring-shaped thin wall portion serves to stabilize the quality of the mass-produced bolt member by determining the position from which the enlarged diameter portion of the bolt member is expanded. An all-around ring is preferable in order to stably position the tip of the slit groove of the bolt member when mass-produced.

When a ring-shaped thin part perpendicular to the slit groove is provided, the volume of the thickened diameter-enlarged part is kept constant. For this reason, as the wedge-shaped member is embedded from the terminal position of the slit groove into the bottomed hole, the slit groove starts to open at the same position every time at an angle larger than the taper angle. When the wedge-shaped member is embedded and accommodated in the bottomed hole of the bolt member, the diameter-enlarged portion of the bolt member hits the deep hole side wall of the structure with a strong pressing pressure, and then the slit groove has a predetermined angle with a large angle. Along the taper angle. As a result, the enlarged diameter portion of the bolt member opens in an elliptical shape in a hole such as concrete. Since a strong pressing pressure is applied to the tip of the enlarged diameter portion of the bolt member, in the case of an elongated bolt member, the end of both the long and short slit grooves needs to be beyond the ring-shaped thin portion and be in the threaded portion.

On the other hand, when there is no ring-shaped thin wall portion, the diameter-expanded portion of the bolt member gradually expands until it conforms to the taper angle of the wedge-shaped member to be embedded, and the diameter-expanded portion of the bolt member is concrete. It just hits the deep hole side wall. Therefore, the pressing force with which the enlarged diameter portion of the bolt member hits the deep hole side wall of the structure is weak. In exceptional cases, the slit grooves may not be evenly opened. In this case, the end position of the enlarged diameter portion of the bolt member is not fixed when the slit groove is long and short, and even when the slit grooves for four equal parts are used equally. The bolt member may not open and the quality of the bolt member is not stable.

Preferred embodiments of the metal anchor of the present invention are as follows.
The slit groove preferably has long and short slits in which long slit grooves and short slit grooves are cut along the axial center from the end face of the bolt member, and the two short slits and long slits are respectively More preferably, they are facing each other. This is because a pressing force or a caulking force is equally applied to the enlarged diameter portion of the bolt member.

Moreover, although the said equally divided slit can be divided into 3-6 parts, it is preferable that it is divided into 4 parts. Even when the caulking is performed with the wedge-shaped member guide portion inserted into the bottomed hole of the bolt member, the end surface of the enlarged diameter portion of the bolt member is crushed into an elliptical shape, making it difficult for the wedge-shaped member to come out of the bolt member. It is. Also, when an opening force is applied to the expanded diameter portion of the bolt member by striking the wedge-shaped member, the end surface of the expanded diameter portion of the bolt member becomes elliptical, strongly pressing the deep hole side wall of the structure and wedge-shaped This is because the member is difficult to come off from the bolt member. For this reason, joining of the side wall of a deep hole bottom part and a bolt member is strengthened, and the adhesion strength with the deep hole side wall of a structure can be remarkably increased together with adhesion to a chemical anchor.

In addition, it is preferable that the said enlarged diameter part is a thick part rather than a thread part. For example, it is preferable that knurling is performed as in the conventional case. This is because, when the bolt member bites into the deep hole side wall of the hard structure more than before, the bolt member is firmly fixed to the deep hole side wall of the structure. Moreover, it is preferable that the front-end | tip of the said enlarged diameter part is chamfered. This is because a strong pressing force is applied to the side wall of the deep hole of the structure. By these processes, a torque value of twice or more can be obtained. In addition, the bolt member can be easily grasped during temporary caulking by knurling.

The preferable embodiment in the earthquake-proof reinforcement method of the structure of this invention is as follows.
The slit grooves preferably have long and short lengths, and more preferably, the two short slits and the long slits face each other. This is because a pressing force or a caulking force is applied to the enlarged diameter portion of the bolt member evenly on the left and right, leading to a reduction in work time. Further, since the distance connecting the tip end of the short slit groove and the tip end of the long slit groove is longer than the distance connecting the tip ends of the equal slits, the torque performance with respect to rotation is remarkably improved.

Moreover, although the said equally divided slit has 3-6 equal parts, it is preferable that it is divided into 4 equal parts. The end face of the enlarged diameter part of the bolt member becomes elliptical, strongly pressing the deep hole side wall of the structure and making the wedge-shaped member difficult to come off from the bolt member, dramatically increasing the adhesion strength with the deep hole side wall of the structure be able to. For this reason, if it is the same pulling strength as before, a thin bolt member may be used, the hole diameter is small and shallow, and the working time is shortened.

In the present invention, in the case of an elongated bolt member having a diameter of 14 mm or less, preferably 12 mm or less, a ring-shaped thin portion perpendicular to the slit groove is provided. First, the end of the slit groove is formed on the deep hole side wall of the structure. A large horizontal component force is applied as a starting point, and the enlarged diameter portion opens into an elliptical shape, so that the enlarged diameter portion of the bolt member is concentrated into the deep hole side wall of the structure, and the elasticity of the bolt member By using force, it is kept strong and the fixing strength with the adhesive anchor is greatly increased. Finally, even in the case of a hard structure such as concrete or bedrock, the outer shape of the bolt member is made substantially straight, and the bolt itself has the same earthquake resistance as before.

In the case of a long bolt member with a diameter of more than 12 mm, preferably more than 14 mm, the ring-shaped thin wall part opens sufficiently, although it depends on the type of concrete to be applied and the hole diameter / depth, so the end of the slit groove Even in the ring-shaped thin part, it can sufficiently withstand the twisting force and vibration. On the other hand, the wedge-shaped member is provided with a large-angle tapered portion so that the wedge-shaped member is opened after the concrete hole bottom is securely attached, and a corresponding gradient groove for receiving the large-angle tapered portion is provided in the bottomed hole of the bolt member.

On the other hand, the gap between the enlarged diameter portion of the bolt member and the deep hole side wall of the structure is as narrow as about submillimeter (0.1 to 0.6 mm) even when the bolt member is inserted, and the thickness of the enlarged diameter portion of the bolt is several. Since the diameter of the expanded portion of the bolt member is expanded / returned, the expanded portion does not become the starting point of long-term vibration fracture due to the rigidity of the bolt member itself. Furthermore, when an adhesive anchor is used, the fixed resin adhesive disperses vibrations, so that the deterioration over time of the bolt member itself can be reduced as before.

In order to increase the rigidity of the bolt member itself, it is preferable that the enlarged diameter portion of the bolt member is a thick portion. This is because the difference from the ring-shaped thin portion is increased by using the thick portion.

When the wedge-shaped member is temporarily caulked in the deep hole of the bolt member, the work of the seismic reinforcement method for the structure can be speeded up. This is because the bolt member is deformed and held in an elliptical shape, so that the wedge-shaped member does not fall out of the bolt member even during the transfer of the metal-based anchor, and the work can be performed as it is at the enforcement site.

Moreover, in this invention, since the primary fixing strength by a metal anchor is high, even if it is a case where it uses together with a resin adhesive anchor using a resin adhesive with high viscosity, a diameter expansion part does not shift | deviate.

In the present invention, the long and short slits are used for the following reason. That is, even if the diameter-expanded portion on the short slit side expands from the boundary portion with the ring-shaped thin portion, the diameter-expanded portion on the long slit side expands along the taper angle of the wedge-shaped member. Therefore, the length ratio of the long and short slits excluding the extended distance is larger than the length ratio of the first long and short slits, and a large spreading force is applied to the enlarged diameter portion on the short slit side due to the groove width on the long slit side. Take it. As a result, the groove width on the short slit side is not relatively expanded, and the groove width on the long slit side is relatively expanded, resulting in an elliptical shape as a whole. For this reason, particularly when the slit groove is divided into four equal parts, a strong pressing pressure is applied to the deep hole side wall of the structure at the tip enlarged diameter portion on the short slit side.

In the seismic strengthening method of the structure of the present invention, the effect of primary fixing and secondary fixing is more effective when the structure is made of concrete in the seismic strengthening method of a structure fixing in a deep hole of a structure such as concrete. It is a hard object such as a bedrock.

According to the metal anchor of the present invention,
(1) Since the bolt member is provided with a ring-shaped thin portion perpendicular to the slit groove, the volume of the thick opening portion becomes constant, and the position having the function of expanding is determined. The opening quality of can be stabilized.
(2) Since the bolt member always bites into an elliptical shape near the bottom of the deep hole side wall of the structure, the bolt member is firmly bonded at the upper part of the deep hole side wall of the structure of the conventional resin-bonded anchor. Considering it together, a force that opposes the pulling force from the opposite direction of the metal anchor is obtained on the entire surface of the deep hole side wall, and the pulling strength of the metal anchor is greatly increased.
(3) Since the distance between the long slit groove end and the short slit groove end of the bolt member is longer than the conventional distance between the same slit groove ends, the shearing force against the twist of the metal anchor is also greatly increased.
(4) As a result of the drastic increase in the pullout strength and shearing force of metal anchors, metal anchors can be used even when bolt members with short diameters or lengths are used by shortening the deep hole diameter or hole depth of the structure. The pullout strength and shearing force of the secondary effect of obtaining sufficient strength can be obtained.
(5) Also, when secondary fixing with a resin adhesive is used in combination, the resin adhesive disperses the vibration from the structure to the metal anchor, and the deterioration with time of vibration resistance is reduced. The state of high fixing strength can be continued stably.
(6) In addition, since the slit groove widths of alternating long and short are equally divided, the slit width on the long slit groove side is increased, the liquid flow of the resin adhesive can be improved, and the quality of the seismic reinforcement method is stable. To do.

On the other hand, according to the seismic strengthening method for a structure of the present invention, the above-described metal anchor can be obtained, and the following additional effects can be obtained.
(1) Since the bolt member is securely fixed, the working time is shortened.
(2) Also, if the bolt and wedge-shaped members are temporarily swaged, the working time will be shortened and the working efficiency of the metal anchor will not be messed up, resulting in improved work efficiency. .
(3) In addition, since the fixing of the structure to the deep hole side wall becomes strong, the cleaning process in the hole is further simplified, and the fixing defect due to the defective cleaning in the hole is eliminated.
(4) When the diameter and length of the bolt member are shortened, the construction process of the structure can be shortened, and the manufacturing cost of the seismic reinforcement method for the structure can be suppressed.

In the main body drive-in type metal anchor of Example 1, (A) shows a bolt member 1 having an enlarged diameter, and (B) shows an enlarged portion 2 thereof. The wedge-shaped member 8 of the main body drive-in type metal anchor of Example 1 is shown. The construction procedure of the earthquake-proof reinforcement method of Example 3 is shown. The example of the conventional wedge-shaped member of a main body drive-in type metal anchor is shown. The example of the conventional wedge-shaped member of a main body drive-in type metal anchor is shown. The example of the conventional wedge-shaped member of a main body drive-in type metal anchor is shown.

Next, a preferred embodiment of the present invention will be described.

An elongated bolt member having a diameter of 12 mm will be described.
As shown in FIG. 1 (A), a steel bolt member 1 having a total length of 90 mm and a diameter of 12 mm is provided with a diameter-enlarged portion 2 subjected to iris-shaped knurling from its tip to a length of 10 mm, and a diameter of 10 below. A ring-shaped thin portion 7 having a length of .8 mm and a length of 1.2 mm is provided, and a screw groove 4 having a threaded M12 is provided below the ring-shaped thin portion 7 over the entire length. As shown in FIG. 1B, the end face of the enlarged diameter portion 2 has a bottomed hole 5 having a diameter of 5.5 mm and a depth of 26 mm, and linear slit grooves 6 and 6 ′ having a width of 1 mm and a length of 18 mm. Two linear slit grooves 3, 3 ′ having a width of 1 mm and a length of 10.5 mm were opposed to each other so as to be two in a cross shape. The bottomed hole 5 guides a guide portion 9 having a diameter of 5 mm and a length of 8 mm of a wedge-shaped member 8 of FIG. 2 to be described later, and an outer taper portion having an inner diameter of 9 mm and a large-angle taper portion 10 having a length of 4 mm (conical angle 90 °). ) Has an inner tapered portion 14 (cone angle 90 °) having an outer diameter of 6.5 mm.

As shown in FIG. 2, the wedge-shaped member 8 is provided with the guide portion 9, the large angle taper portion 10, and the small angle taper portion 11 described above, and the pin portion 12 having a diameter of 5 mm and a length of 10 mm. The pin portion 12 crushes the resin adhesive capsule by striking force or the like, and the large-angle taper portion 10 and the small-angle taper portion 11 of the wedge-shaped member 8 by the reaction force of the deep hole bottom of the structure, the bottomed hole 5 of the bolt member 1. Because it is inserted into.

The guide portion 9 and the large-angle taper portion 10 of the wedge-shaped member 8 were fitted into the bottomed hole 5 of the bolt member 1 and tightened slightly by one turn with a torque wrench (product name: CSF / CF torque wrench) manufactured by Tohnichi. As a result of this temporary crimping, the enlarged diameter portion 2 of the bolt member 1 was deformed into an elliptical shape having a major axis of 11.6 mm and a minor axis of 11.4 mm, as shown in FIG.

Holding the terminal portion of the screw groove 4 of the temporarily crimped bolt member 1 by hand and striking the position of the guide portion 9 of the wedge-shaped member 8 on the other bolt member from above the bolt member 1 until the wedge-shaped member 8 comes off. As a result, the wedge-shaped member 8 was removed from the bolt member 1 after 21 times.

A thick bolt member having a diameter of 16 mm will be described.
A steel bolt member 1 having a total length of 140 mm and a diameter of 16 mm is provided with a diameter-enlarged portion 2 subjected to iris knurling from the tip to a length of 13 mm, and a ring having a diameter of 11.5 mm and a length of 2.5 mm is provided below it. A thin thin portion 7 is provided, and a screw groove 4 is formed below the M16 screw process over substantially the entire length. Further, the end face of the enlarged diameter portion 2 has a bottomed hole 5 having a diameter of 6 mm and a depth of 30 mm and two long slit grooves 6 and 6 ′ having a width of 1 mm and a length of 21 mm facing each other, a width of 1 mm and a length of 15 mm. The short slit grooves 3 and 3 'were placed so as to face each other in two crosses. The bottomed hole 5 guides a guide portion 9 having a diameter of 6 mm and a length of 10 mm of a wedge-shaped member 8 described later, and an outer taper portion 13 having an inner diameter of 13 mm and a large-angle taper portion 10 having a length of 5 mm (conical angle 90 °). It has an inner tapered portion 14 (conical angle 90 °) for accommodation.

As shown in FIG. 2, the wedge-shaped member 8 includes the guide portion 9 described above, the large-angle taper portion 10 having the same angle as that of the first embodiment, and the small-angle taper portion 11 having a maximum diameter of 11 mm, and a diameter of 6 mm and a length of 13 mm. The pin part 12 was provided.

The guide portion 9 of the wedge-shaped member 8 and the large-angle taper portion 10 are fitted into the bottomed hole 5 of the bolt member 1, and the pin portion 12 of the wedge-shaped member 8 is left 10 mm by a concrete drill hammer drill made by Hitachi Koki. I inserted it. As a result, the enlarged diameter portion 2 of the bolt member 1 was deformed into an elliptical shape having a major axis of 19.3 mm and a minor axis of 18.8 mm, as shown in FIG. Moreover, the short slit groove width opened to 2.6 mm, and the long slit groove width opened to 3.9 mm.

As shown in FIG. 3 (A), a concrete block having a size of 1000 mm × 1000 mm × 500 mm (design preliminary strength is 24 N / mm ² ) is drilled with a drill diameter of 13 mm and a drill length of 60 mm using the above hammer drill. The chips in the holes were removed with a nylon brush and an electric blower.
As shown in FIG. 3A, the adhesive anchor has an outer diameter of 8 mm and a length of 40 mm. An epoxy acrylate resin having a viscosity of 2.0 Pa · s is enclosed in a glass tube 13 having a recess, and calcium sulfate is contained in the recess. The adhesive capsule container 15 was used in which two benzoyl peroxide rings 14 diluted in step 1 were arranged at intervals of 15 mm in width.

First, the bolt member 1 in which the wedge-shaped member 8 of Example 1 was temporarily crimped was inserted, and was placed with the above-described hammer drill. When a tensile test was performed according to JIS Z2241, using an Amsler type universal compression tensile tester manufactured by KFC Corporation, it was 3 tons 400 kg.

Next, as shown in FIG. 3B, the adhesive capsule container 15 is placed in the concrete hole, and the bolt member 1 in which the wedge-shaped member 8 of Example 1 is temporarily crimped is inserted from above, and the above-described hammer drill is inserted. It was set up with. As shown in FIG. 3C, the above-described tensile test was performed on the primary anchor and the secondary anchor metal anchor (the one left for 24 hours after 30 minutes). The result was a pullout strength of 4 tons or more and the concrete block was destroyed. Moreover, the torque value of twist strength could not be measured with the torque wrench.

Comparative Example 1

Except that the length of all four slit grooves was set to 18 mm, the same bolt (hereinafter referred to as “comparative product”) as in Example 1 was used, and the wedge-shaped member 8 as a comparative product was pulled out as in Example 1. As a result of measuring the number of hits until the wedge member 8 was removed from the bolt member 1 in nine times.

Comparative Example 2

Using the comparative product, the same tensile test as in Example 4 was conducted except that the product was allowed to stand for 24 hours. Moreover, when it rotated with the said torque wrench, three diameter expansion parts 2 of four were torn off.

As is apparent from the above results, it can be seen that the steel bolt member of the present invention is more elliptical than the comparative product by deforming into an elliptical shape, and is superior in tightening torque. Further, it can be seen that the steel bolt member of the present invention has a very high pull-out strength of the diameter-expanded portion 2, and therefore the tensile test performance is also greatly improved. Further, the steel bolt member of the present invention has good turning performance and the expanded diameter portion 2 is not torn off. This is because the distance connecting the short slit groove tip and the long leave groove tip is increased.

The present invention relates to fixing / installation of vibration machines / equipment such as elevators, escalators, shutters, conveyors, etc., fixing / installation of equipment in tunnels, installation of anti-falling materials for highways and railways, installation of fenders, train rails There are uses such as mounting sleepers.

DESCRIPTION OF SYMBOLS 1 Bolt member 2 Expanded diameter part 3 of bolt member 3, 3 'Short slit groove 8 Wedge-shaped member 10 Large-angle taper part 15 of wedge-shaped member Adhesive capsule container

Claims (10)

A wedge-shaped member inserted into a deep hole of a structure such as concrete, a bolt member fitted to the wedge-shaped member, and a nut member screwed to fix the bolt member;
The wedge-shaped member consists of a guide bar part, a taper part and a striking bar part,
The bolt member is composed of an enlarged diameter portion and a screw portion, and the enlarged diameter portion has a bottomed hole penetrating the center axis and a metal anchor having a slit groove obtained by equally dividing the enlarged diameter portion.
(A) The tapered portion of the wedge-shaped member includes a large angle tapered portion and a small angle tapered portion,
(B) There is a ring-shaped thin portion at the boundary between the enlarged diameter portion of the bolt member and the screw portion,
(C) The slit groove has a different length.
And,
(D) A metal-based anchor used in combination with a resin-bonded anchor, wherein the bottomed hole of the bolt member has a receiving groove corresponding to the large-angle tapered portion of the tapered portion of the wedge-shaped member. The metal-based anchor according to claim 1, wherein the slit grooves are alternately long and short. The metal-based anchor according to claim 1, wherein the slit groove is divided into four equal parts. The metal anchor according to claim 1, wherein the bolt member is an elongated bolt member, and the short slit groove penetrates the ring-shaped thin portion. 2. The metal anchor according to claim 1, wherein the bolt member is a thick bolt member, and the terminal end of the short slit groove is on the ring-shaped thin portion. The metal-based anchor according to claim 1, wherein the enlarged-diameter portion is a thicker portion than the screw portion. An adhesive capsule is inserted into a deep hole of a structure such as concrete, and is composed of a wedge-shaped member having a guide bar portion, a taper portion and a striking rod portion from the top, and a diameter-expanded portion and a threaded portion. A bolt member having a bottomed hole penetrating the portion and a slit groove obtained by equally dividing the enlarged diameter portion is sequentially inserted, and then the upper portion of the bolt member is expanded by hitting force or rotary pressing. In the seismic reinforcement method of the structure that opens the diameter part and primarily fixes, and fixes the inside of the deep hole of the structure such as concrete by secondary fixing with the adhesive of the broken adhesive capsule,
(A) using the wedge-shaped member consisting of a large-angle taper portion and a small-angle taper portion in the taper portion of the wedge-shaped member;
And,
(B) There is a ring-shaped thin portion at the boundary between the enlarged diameter portion of the bolt member and the screw portion,
(C) The slit groove has a different length.
and,
(D) By using the bolt member having a receiving groove corresponding to the large-angle tapered portion of the tapered portion of the wedge-shaped member in the bottomed hole of the bolt member, the bolt is inserted into the deep hole of the structure such as the concrete. A method for seismic reinforcement of a structure, characterized in that the expanded portion of the member opens in an elliptical shape. An adhesive capsule is inserted into a deep hole of a structure such as concrete, and is composed of a wedge-shaped member having a guide bar portion, a taper portion and a striking rod portion from the top, and a diameter-expanded portion and a threaded portion. A bolt member having a bottomed hole penetrating the portion and a slit groove obtained by equally dividing the enlarged diameter portion is sequentially inserted, and then the upper portion of the bolt member is expanded by hitting force or rotary pressing. In the seismic reinforcement method of the structure that opens the diameter part and primarily fixes, and fixes the inside of the deep hole of the structure such as concrete by secondary fixing with the adhesive of the broken adhesive capsule,
(A) preparing the wedge-shaped member consisting of a large-angle taper portion and a small-angle taper portion at the taper portion of the wedge-shaped member;
(B) There is a ring-shaped thin portion at the boundary between the enlarged diameter portion of the bolt member and the screw portion,
(C) The slit groove has a different length.
and,
(D) By preparing the bolt member having a receiving groove corresponding to the large-angle taper portion of the tapered portion of the wedge-shaped member in the bottomed hole of the bolt member, and using a metal-based anchor in which both are temporarily crimped, A seismic reinforcement method for a structure, characterized in that the enlarged diameter portion of the bolt member opens in an elliptical shape in a deep hole of a structure such as concrete. The metal-based anchor according to claim 7 or 8, wherein the slit grooves alternately have long and short lengths. The seismic reinforcement method for a structure according to claim 7 or 8, wherein the slit groove is divided into four equal parts.

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