JP3894812B2 - Anchor bolt - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an anchor bolt that can be firmly fixed so as not to come off.
[0002]
[Prior art]
Anchor bolts that are fixed by drilling holes in rigid supports such as concrete floors, and mounting and supporting structures and various objects, have conventionally been drilled straight and inserted into anchor bolts to expand the bottom end of anchor bolts. By doing so, the mainstream method is to firmly press against the wall surface of the hole and fix it so that it does not come off.
[0003]
For example, in Japanese Patent Application Laid-Open No. 7-26633, a hollow cylindrical shape is formed, an annular thin portion is provided in the middle portion of the side wall, and a tapered surface that extends outward from the thin portion toward the outer end is formed. The insertion tube is inserted into the outer insertion tube, and a tapered portion is provided on one side so that the inclination of the tapered surface and the inclination thereof are substantially coincided with each other. An anchor bolt having a provided screw is disclosed. The anchor bolt is inserted into an embedding hole formed in a hard support, and the taper portion of the insertion tube is screwed into the insertion tube by tightening the mounting female screw. The taper portion is expanded and pressed against the wall surface of the embedding hole to be fixed.
[0004]
In Japanese Patent Laid-Open No. 9-209457, a cone having two stages of tapered surfaces with different inclination angles formed at the tip of the anchor body, and the two-stage taper mounted around the cone. A post-construction anchor comprising a wedge portion that contacts a tapered surface having a large inclination angle and an expansion plate that includes a shell portion that contacts a tapered surface having a small inclination angle is disclosed. After inserting into the fixing hole drilled in the concrete base material, the wedge part is locked to the wall surface of the fixing hole by exerting a pulling action on the anchor body, and the shell part is firmly pressed against the wall surface to be fixed. A fixing method is disclosed.
[0005]
[Problems to be solved by the invention]
The embedding hole for inserting and fixing the anchor bolt in JP-A-7-26633 and the fixing hole for inserting and fixing the post-construction anchor in JP-A-9-209457 have been conventionally performed. Since it is fixed by a straight hole that is not penetrated, there is a possibility that it will come off against a strong tensile force. In Japanese Patent Laid-Open No. 9-209457, the shell portion is attached to the wall surface of the hole by the pulling action. Although it is strongly pressed and the wedge part bites into the wall surface of the hole, the durability when a strong repeated tensile force such as an earthquake is applied to support the installation of large-scale structures such as bridges and plants Has problems that are not enough.
[0006]
In addition, the strong repeated tensile force acting on the anchor bolt may cause the hole wall of the support to be rubbed and damaged or deformed, and the hole cannot be reused. There is a problem that is easy to receive.
This invention makes it a subject to provide the anchor bolt made | formed in view of these problems.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has taken the following measures.
Ie
(1) A taper-shaped head portion that extends downward at the lower end portion and a cylindrical neck portion having the same outer diameter upward from the small-diameter portion of the tapered head portion, and threaded to thread the nut from the upper end portion. A bolt shaft body, an engaging member that is attached to the cylindrical neck portion of the bolt shaft body so as to be freely expandable, and a nut is screwed into a threaded portion of the bolt shaft body, and the engaging member is tightened by tightening the nut. In an anchor bolt including an extruding member that is extruded, and an engaging member that is extruded by the extruding member is expanded in a downwardly expanding taper shape , a nut is screwed into a threaded portion of the bolt shaft body. Combined with each other, the push-out member that pushes the engagement member by tightening the nut is provided with two concave grooves in the circumferential longitudinal direction of the bolt shaft body, and the extrusion plate is inserted into each of the concave grooves. By tightening the nut Press out plate is an anchor bolt, characterized by being configured to extrude an engagement member.
Engagement member mounted to freely expansively opened into a cylindrical neck portion of the bolt shaft body is fitted to the inner diameter to the cylindrical neck portion of the bolt shaft member, forming an outer diameter larger cylindrical than the screw outside diameter of the bolt shaft body Then, a concave groove is provided on the outer periphery of the upper end, and the circumference is equally divided into a plurality of parts, and an elastic ring is fitted into the concave groove so as to be openable so as to surround the cylindrical neck portion of the bolt shaft body. Ru is attached.
(2) Between the upper end surface of the extrusion plate and the lower surface of the nut, the inner diameter of the threaded portion of the bolt shaft body can be penetrated, and two locations are provided at relative positions in the circumferential longitudinal direction of the bolt shaft body. A spacer with a tongue piece that engages with the concave groove is interposed, and an inner diameter is fitted to the cylindrical neck portion of the bolt shaft body between the lower end surface of the extrusion plate and the upper surface of the engagement member, The anchor bolt according to item (1) , wherein a spacer is interposed between the outer diameter and the outer diameter of the engaging member.
(3) An extruded member in which a nut is screwed into the threaded portion of the bolt shaft body and the engaging member is pushed out by tightening the nut is positioned at a relative position in the circumferential longitudinal direction of the bolt shaft body. Two ribs are provided, and a rib that engages with the concave groove is provided in the inner diameter hole of the extruded pipe through which the bolt shaft body can pass, and is inserted into the bolt shaft body. It is comprised so that it may extrude, It is an anchor bolt of previous clause (1) characterized by the above-mentioned.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The embodiment of the present invention will be described with reference to the drawings showing the examples. As shown in FIG. 1, the tapered head 1a spreading downward at the lower end and the same diameter upward from the small diameter portion of the tapered head. Bolt shaft body 1 having a cylindrical neck portion 1b having a diameter and threaded to screw a nut from above, and engagement member 2 mounted to be freely expandable on columnar neck portion 1b of the bolt shaft body. And an extruding member 4 in which a nut 3 is screwed into a threaded portion of the bolt shaft body 1 and the engaging member 2 is extruded by tightening the nut.
[0009]
As shown in FIG. 2, the bolt shaft body 1 is formed with a tapered head portion 1a extending downward at the lower end portion and a cylindrical neck portion 1b having the same outer diameter formed above the small diameter portion of the tapered head portion. Screw processing is performed to screw the nut, and the groove 1c is provided in two relative positions in the circumferential longitudinal direction of the bolt shaft body 1 (one position on the opposite back surface is not shown). is there. In the embodiment diagram, the screw processing is performed from the upper part of the bolt shaft 1 to the boundary region of the cylindrical neck 1b at the lower part. However, the screw processing is sufficient for screwing and fixing the nut from above. As long as it is given to the area.
[0010]
As shown in FIG. 3, the engaging member 2 is formed in a cylindrical shape in which an inner diameter hole 2 a is fitted into a columnar neck 1 b of the bolt shaft body 1 and an outer diameter 2 b is larger than a screw outer diameter of the bolt shaft body 1. In addition, a groove 2c is provided on the outer periphery of the upper end, and the circumference is equally divided into a plurality (4 in the embodiment in FIG. 3), and an elastic ring 5 that can be stretched and contracted as shown in FIG. It is fitted so that it can be opened and expanded, and surrounds the columnar neck 1b of the bolt shaft body 1. The elastic ring 5 may be a commercially available rubber O-ring.
[0011]
The pushing member 4 pushes the pushing plate 4A as shown in FIG. 4 into the recessed groove 1c provided at two relative positions in the circumferential longitudinal direction of the bolt shaft body 1 by tightening the nut 3 so as to engage the engaging member 2. The spacer 6 is interposed between the upper end surface of the extrusion plate 4A and the lower surface of the nut 3, and the spacer 6 is a screw of the bolt shaft body 1 as shown in FIG. By providing an inner diameter hole 6a through which the portion can pass and providing tongue pieces 6b, 6b to engage with the concave grooves 1c provided at two positions relative to the inner diameter hole in the circumferential longitudinal direction of the bolt shaft 1 The extrusion plate 4A is pushed well by tightening the nut 3. The outer diameter of the spacer 6 is larger than the outer diameter of the screw of the bolt shaft body 1, but has a size that can be inserted into a hole formed to fix the anchor bolt.
[0012]
Further, a spacer 7 is interposed between the lower end surface of the extrusion plate and the upper surface of the engaging member 2, and the spacer 7 is fitted to the columnar neck 1 b of the bolt shaft body 1 and has an outer diameter. The outer diameter of the engaging member 2 is substantially the same as that of the engaging member 2, and the circumference is in contact with the upper surface of the engaging member 2 that is equally divided into a plurality of parts so as to be uniformly extruded.
[0013]
The extrusion member 4 is not the extrusion plate 4A as described above, but is provided with ribs 4b and 4b in the inner diameter hole 4a of the extrusion pipe 4B as shown in FIG. The engagement member 2 can be pushed out by tightening the nut 3 so as to be engaged between the nut 3 and the engagement member 2 so as to engage with the concave grooves 1c provided at two positions in relative positions. The extruded pipe 4B is a thin extruded pipe that can be inserted into a gap between a screw outer diameter of the bolt shaft body 1 and a hole formed for fixing an anchor bolt.
[0014]
Then, by pushing the pushing member 4 by tightening the nut 3 and pushing the engaging member 2, the engaging member 2 is pushed from the columnar neck 1 b of the bolt shaft body 1 to the tapered head 1 a, and the engaging member The inner diameter 2a of 2 is expanded by the tapered surface of the tapered head 1a, and the engaging member 2 exhibits a downwardly expanding tapered shape.
[0015]
Next, fixing the anchor bolt as described above to a hard support such as a concrete floor will be described with reference to FIGS.
First, as shown in FIG. 7, a straight hole 9 is formed in a support 8 such as a concrete floor board, and a taper hole 9 a that extends downward is formed in a lower end portion of the straight hole. The inner diameter of the straight hole 9 is made about 1.5 to 3 mm larger than the screw outer diameter of the bolt shaft body 1 according to the bolt shaft body 1 of the anchor bolt to be fixed. The conical hole 9b at the lower end is a hole trace caused by the cone angle at the tip of the drill when the straight hole 9 is drilled, and is not particularly required for drilling according to the present invention.
[0016]
Next, when the anchor bolt according to the present invention is inserted into the straight hole 9 and the tapered hole 9a formed in the support body 8 as described above, the state shown in FIG. 8 is obtained. When the nut 3 is tightened in this state, the extruding members 4 and 4 are pushed downward via the spacer 6, and the engaging member 2 is pushed downward via the spacer 7.
[0017]
Since the engaging member 2 is equally divided into a complicated circumference and is mounted on the columnar neck 1b of the bolt shaft body 1 so as to be expandable and retractable by an elastic ring 5 that can be expanded and contracted, When the tape is pushed downward, the taper surface of the taper-shaped head 1a at the lower end expands into a taper that expands downward. As shown in FIG. 9, the engagement member 2 is completely in close contact with the taper hole 9a. Accordingly, the anchor bolt is firmly fixed to the support 8, and durability is maintained against a strong tensile force.
In FIG. 9, the nut 3 is brought into contact with the support surface of the support 8 and tightened. However, when the object to be supported is supported and fixed, the support surface of the support 8 and the nut 3 It is assumed that the nut 3 is tightened with a supported object interposed between them.
[0018]
In addition, a gap of about 1.5 to 3 mm is provided between the outer diameter of the screw shaft 1 of the anchor bolt and the inner diameter of the straight hole 9 of the support body 8, so that the hole 9 and the small diameter portion expand downward. In order to tightly engage the outer diameter of the engagement member 2 that is expanded in a tapered shape with the tapered head portion 1a at the lower end of the bolt shaft body 1 in the tapered hole 9a formed in By increasing the outer diameter of the engagement member 2 that is mounted on the cylindrical neck 1b and is not expanded, within the gap, the outer diameter of the bolt shaft body 1 is increased. The portion can be suitably closely engaged without being displaced from the tapered surface of the tapered head 1a.
[0019]
【The invention's effect】
As described above, according to the present invention, a hard support such as a concrete floor board is provided with a straight hole and a taper hole extending downward at the lower end of the straight hole, and the taper hole is provided with an anchor. an engagement member attached to the lower end of the bolt, expansively opened into tapered lower spreading Te uniformly well extruded by extrusion members, which are engageable fitted into the concave groove of the bolt shaft body, by engagement contact engagement, Since the anchor bolt is fixed, it can be firmly fixed without being pulled out due to the taper close contact even if a strong tensile force is applied, and it can be used for mounting and supporting large structures such as bridges and plants. It is effective in maintaining durability against strong repeated tensile forces.
[0020]
In addition, the taper hole provided at the lower end of the straight hole and the engagement member provided at the lower end of the anchor bolt are expanded in a taper shape and completely intimately engaged, so that the wall surface of the hole is rubbed and scratched. The anchor bolt can be prevented from being attached or deformed, and the anchor bolt itself can be hardly damaged.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of an anchor bolt according to the present invention.
FIG. 2 is a perspective view of a bolt shaft body.
FIG. 3 is a perspective view of an engaging member.
FIG. 4 is a perspective view when the extruding member is an extruding plate.
FIG. 5 is a perspective view of a spacer interposed between an upper end surface of an extrusion plate and a nut when the extrusion member is an extrusion plate.
FIG. 6 is a perspective view when the extrusion member is an extrusion pipe.
FIG. 7 is a longitudinal sectional view showing an embodiment of a hole for fixing an anchor bolt to a support.
8 is a longitudinal sectional view showing a state in which an anchor bolt is inserted into the hole shown in FIG.
FIG. 9 is a longitudinal sectional view showing a state where anchor bolts are fixed.
[Explanation of sign]
1 Bolt shaft body
1a Tapered head
1b Columnar neck
1c, 2c groove
2 engaging member
2a, 4a, 6a ID hole
2b Outer diameter
3 Nut
4 Extruded member
4A extrusion plate
4B Extruded pipe
4b rib
5 Elastic ring
6,7
6b tongue
8 Support
9 holes
9a Taper hole
9b conical hole

Claims (3)

A bolted shaft body in which a tapered neck having a lower end and a cylindrical neck having the same outer diameter are formed upward from a small diameter portion of the tapered head, and a screw is processed to screw a nut from the upper end. And an engaging member mounted to the cylindrical neck portion of the bolt shaft body so as to be freely expandable, and a nut is screwed into the threaded portion of the bolt shaft body, and the engaging member is pushed out by tightening the nut. In the anchor bolt, the engagement member extruded by the extrusion member is expanded in a downwardly expanding taper shape , the nut is screwed into the threaded portion of the bolt shaft body, The push-out member, which is configured to push out the engagement member by tightening the nut, is provided with two grooves with relative positions in the circumferential longitudinal direction of the bolt shaft body. Tighten the extrusion pre Anchor bolt, characterized in that press and is configured to extrude the engagement member. Between the upper end surface of the extrusion plate and the lower surface of the nut, an inner diameter that allows the threaded portion of the bolt shaft body to pass therethrough, and is formed in two concave grooves provided at relative positions in the circumferential longitudinal direction of the bolt shaft body. A spacer with an engaging tongue piece is interposed, and an inner diameter is fitted to the cylindrical neck portion of the bolt shaft body between the lower end surface of the extrusion plate and the upper surface of the engaging member, and the outer diameter is 2. The anchor bolt according to claim 1 , wherein a spacer having a diameter substantially the same as the outer diameter of the engaging member is interposed. There are two places where the nut is screwed into the threaded part of the bolt shaft body, and the engaging member is pushed out by tightening the nut. Provide a rib that engages with the concave groove in the inner diameter hole of the extrusion pipe through which the bolt shaft body can penetrate, and fit it into the bolt shaft body, and push the extrusion pipe by tightening the nut to push the engagement member The anchor bolt according to claim 1 , wherein the anchor bolt is configured as follows.

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