JP4227702B6 - Reinforcing bar anchor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to anchors for securing the rebar reinforcing or repairing the surface of the existing concrete structure.
[0002]
[Prior art]
When reinforcing concrete on the surface for the purpose of reinforcing or repairing an existing concrete structure, it is usual to first fix the reinforcing bars with anchors. In such a case, conventionally, a grid reinforcing bar 1 as shown in FIG. 4, that is, a reinforcing bar in which vertical and horizontal reinforcing bars 1 a and 1 b are previously welded or tightly integrated into a grid shape, and its intersection is attached by an anchor 2. It is usual to fix to the surface 3.
[0003]
[Problems to be solved by the invention]
By the way, the conventional anchor 2 employed in the above case is driven and fixed with respect to the mounting surface 3. Therefore, a large driving force is required to drive the anchor 2. There is a concern that the concrete to be reinforced or repaired may be seriously damaged, such as cracks, due to the insertion force. In addition, conventionally, the lattice reinforcing bars 1 are fixed in close contact with the mounting surface 3, and therefore, the concrete to be beaten may not be sufficiently filled around the lattice reinforcing bars 1.
[0005]
[Means for Solving the Problems]
In view of the above circumstances, the invention of claim 1 is an anchor for fixing a reinforcing bar to a surface of an existing concrete structure as a mounting surface, and is inserted into a mounting hole formed in the mounting surface and fixed. An anchor body, a nut member screwed to a proximal end portion of the anchor body, and a washer that holds the reinforcing bar by screwing the nut member and holds it against the mounting surface. A screw portion for screwing the nut member is formed at the base end portion, and a wedge portion whose outer diameter gradually increases toward the tip end is formed at the tip end portion, and the tip end portion of the anchor body Is mounted with a sleeve-shaped diameter-expanded member that is expanded by the wedge portion by being relatively displaced toward the distal end side, and bites into the inner surface of the mounting hole. A head that presses the washer against the reinforcing bar by being screwed to the base end of the steel plate, and is integrally formed with the head to reinforce the anchor body and abut against the reinforcing bar to constrain its position. The washer has a loose hole that is curved into a shape capable of holding a reinforcing bar and into which the sleeve portion of the anchor body is loosely inserted.
[0006]
According to a second aspect of the present invention, a taper portion is formed so that a tip end side of the nut portion of the nut member is constricted.
[0007]
According to a third aspect of the present invention, the outer contour of the washer is an oval shape.
[0008]
According to a fourth aspect of the present invention, a spacer interposed between the attachment surface and the reinforcing bar can be attached to the anchor body.
[0009]
According to a fifth aspect of the present invention, a gauge for displaying the position of the surface of post-cast concrete that is post-placed so as to embed a reinforcing bar can be screwed to the head of the nut member.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described. FIG. 1 is an assembly view of the anchor 11 of this embodiment, and FIGS. 2 and 3 are a plan view and a cross-sectional view showing a state in which the lattice reinforcing bar 1 is fixed using the anchor 11.
[0011]
The anchor 11 of the present embodiment includes a rod-shaped anchor main body 12 that is inserted into an attachment hole 5 formed in the attachment surface 3 and fixed thereto, a nut member 13 that is screwed into a base end portion thereof, and a lattice reinforcing bar 1. It consists of a washer 14 for holding.
[0012]
The anchor main body 12 is formed with a screw 15 into which the nut member 13 is screwed at a base end portion thereof, and a wedge portion 16 whose outer diameter is gradually enlarged toward the distal end portion. A sleeve-like diameter-expanding member 17 that is expanded in diameter by the wedge portion 16 and bites into the inner surface of the mounting hole 5 by being relatively displaced toward the distal end side is mounted.
[0013]
The nut member 13 includes a hexagonal head portion 18 and a sleeve portion 19 formed integrally on the lower surface side thereof, and a tapered portion 20 is formed at the distal end portion of the sleeve portion 19 such that the distal end side is narrowed. ing.
[0014]
The washer 14 has an oval outer shape and is curved, and its central hole is a loose hole 21 into which the sleeve portion 19 of the nut member 13 is loosely inserted. As shown in FIG. 3, one end of the washer 14 is formed. By tightening the nut member 13 with the side hooked to the upper reinforcing bar 1 a of the lattice reinforcing bar 1, the nut member 13 can press the lattice reinforcing bar 1 against the mounting surface 3 via the washer 14 to be firmly held and fixed. It has become a thing.
[0015]
In the fixing structure of the present embodiment, when the lattice rebar 1 is fixed using the anchor 11 described above, the lattice rebar 1 is floated on the attachment surface 3 by using the spacer 22 as shown in FIG. Fix it. The spacer 22 is made of a metal plate having a desired thickness, the tip is formed in a triangular shape, and the base has a groove 23 for mounting on the anchor body 12.
[0016]
In order to fix the lattice rebar 1 using the anchor 11 and the spacer 22 described above, a mounting hole 5 having substantially the same diameter as the anchor main body 12 is formed in the mounting surface 3, and the anchor main body 12 is inserted into the mounting hole 5. A washer 14 is attached to the portion, and the nut member 13 is screwed, and the tip of the spacer 22 is inserted immediately below the intersection of the lattice reinforcing bars 1 and the groove 23 is attached to the anchor body 12.
[0017]
When the nut member 13 is screwed and the anchor body 12 is slightly lifted, the diameter-expanding member 17 in contact with the inner surface of the mounting hole 5 is lowered relative to the anchor body 12, and as a result, FIG. As shown in FIG. 2, the diameter-expanding member 17 is expanded by the wedge portion 16 and bites into the inner surface of the mounting hole 5, whereby the anchor body 12 is firmly fixed in the mounting hole 5. At the same time, the lattice rebar 1 is pressed against the mounting surface 3 via the washer 14 by screwing the nut member 13, and the lattice rebar 1 is firmly held against the mounting surface 3 while being sandwiched between the spacer 22 and the washer 14. Fixed.
[0018]
As described above, in the present embodiment, since the screw-in type anchor 11 is employed, there is no concern that the existing concrete may be damaged by the driving force as in the case of the conventional driving, and the nut member 13. By screwing in, the diameter-expanding member 17 is expanded by the wedge portion 16 in the mounting hole 5 and reliably bites in, so that excellent anchor strength superior to conventional driving-type anchors can be secured, and the work is also easy It is.
[0019]
In addition, since the lattice rebar 1 is fixed in a state of being floated on the attachment surface 3 by the spacer 22, the lattice rebar 1 can be freely positioned by setting the thickness of the spacer 22 and is placed on the attachment surface 3. The reinforced concrete can be reliably filled up to the back side of the lattice rebar 1, and therefore, the reinforcing effect can be enhanced as compared with the case where the lattice rebar 1 is simply fixed in close contact with the mounting surface 3.
[0020]
Further, the anchor 11 has an effect of reinforcing the anchor main body 12 by the sleeve portion 19 provided on the nut member 13, and has an effect of restraining the position of the sleeve portion 19 in contact with the intersection of the lattice reinforcing bars 1. As a result, it is possible to effectively prevent displacement and deformation of the lattice reinforcing bars 1. In addition, since the tip portion of the sleeve portion 19 is a tapered portion 20, when the washer 14 is attached to the nut member 13 or when the nut member 13 is screwed into the anchor body 12, the tip end of the sleeve portion 19 becomes the washer 14 or lattice rebar. There is an advantage that it is difficult to be caught by 1 and has excellent workability.
[0021]
Further, since the center hole of the washer 14 is a loose hole 21 to allow the washer 14 to be displaced with respect to the nut member 13, the position of the washer 14 is naturally positioned so that one end of the washer 14 is caught by the lattice rebar 1 by tightening the nut member 13. The lattice rebar 1 can be securely held by being shifted and inclined, and by adopting an oval shape as the washer 14, the size of the washer 14 is minimized, and the concrete filling property on the back side of the washer 14 is impaired. There is no concern.
[0022]
As shown in FIG. 1, it is conceivable to screw a gauge 25 for displaying the position of the concrete surface to be struck on the mounting surface 3 to the head of the nut member 13. In this case, if the position of the tip of the gauge 25 is adjusted according to the unevenness and unevenness of the mounting surface 3 and the additional concrete 26 is placed until it is buried as shown in FIG. Therefore, it is possible to place the surface flatly and accurately.
[0023]
Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. For example, the above embodiment is applied to the case where the lattice rebar is fixed to the upper surface of the slab. However, the present invention can be similarly applied to the case where the lower surface or the wall surface of the slab is used as the mounting surface. It can be similarly applied when fixing the whole, and is particularly applicable when fixing lattice reinforcing bars to the lower surface (ceiling surface) of the slab. In addition, the dimensions and shape of each part of the anchor can be appropriately changed in design, and in particular, the washer and spacer may be set to the optimum size and shape according to the size and form of the reinforcing bar to be fixed. In addition to the oval shape, an oval shape or a rectangular shape can be suitably employed, the shape of the spacer is arbitrary, and the material thereof can be resin.
[0025]
【Effect of the invention】
The anchor according to the first aspect of the invention can be easily fixed, since the diameter-enlarged member provided at the tip of the anchor body can be bitten into the inner surface of the mounting hole only by tightening the nut member. In addition to securing the fixed strength, the sleeve part provided on the nut member provides a reinforcing effect on the anchor body and a restraining effect on the reinforcing bar, and a curved washer with a loose hole is used, so the reinforcing bar ensures the reinforcing bar. It is possible to hold it.
[0026]
Since the anchor of the invention of claim 2 is provided with a taper portion at the tip of the sleeve portion of the nut member, when the washer is attached to the nut member or when the nut member is screwed into the anchor body, the tip of the sleeve portion is It is hard to get caught in the rebar and has excellent workability.
[0027]
In the anchor of the invention of claim 3 , since the outer contour of the washer has an oval shape, the size of the washer can be minimized and there is no fear of impairing the concrete filling property on the back side.
[0028]
In the anchor according to the fourth aspect of the present invention, since the spacer interposed between the reinforcing bar and the mounting surface can be attached to the anchor body, the spacer does not shift or drop off.
[0029]
Since the anchor of the invention of claim 5 can be equipped with a gauge for displaying the position of the surface of the additional cast concrete on the head of the nut member, the additional cast concrete can be placed flat and accurately with the gauge. It is.
[Brief description of the drawings]
FIG. 1 is an assembly view of an anchor according to an embodiment of the present invention.
FIG. 2 is a plan view showing a fixing structure according to an embodiment of the present invention.
FIG. 3 is a sectional view of the same.
FIG. 4 is a view showing a conventional structure for fixing a lattice reinforcing bar.
[Explanation of symbols]
1 Lattice rebar (rebar)
3 Mounting surface 5 Mounting hole 11 Anchor 12 Anchor body 13 Nut member 14 Washer 15 Screw 16 Wedge portion 17 Expanded member 18 Head portion 19 Sleeve portion 20 Tapered portion 21 Loose hole 22 Spacer 25 Gauge 26 Additional cast concrete

Claims (5)

An anchor for fixing a reinforcing bar to the surface of an existing concrete structure as a mounting surface ,
An anchor main body inserted and fixed in a mounting hole formed in the mounting surface; a nut member screwed to the proximal end of the anchor main body; It consists of a washer sandwiched against the surface,
The anchor body is formed with a screw portion for screwing the nut member at a base end portion thereof, and has a wedge portion whose outer diameter gradually increases toward the tip end at the tip end portion, and the anchor body A sleeve-like diameter-enlarging member that is expanded by the wedge portion by being relatively displaced toward the distal end side and bites into the inner surface of the mounting hole is attached to the distal end portion of the main body,
The nut member is formed integrally with the head portion that presses the washer against a reinforcing bar by screwing the nut member to the proximal end portion of the anchor body, and reinforces the anchor body. And a sleeve portion that abuts the reinforcing bar and restrains the position thereof,
The said washer is curved in the shape which can hold | maintain a reinforcing bar, and has the loose hole by which the sleeve part of the said anchor main body is loosely inserted, The anchor characterized by the above-mentioned. The anchor according to claim 1, wherein a tapered portion is formed at a distal end portion of the sleeve portion of the nut member so that a distal end side is narrowed. The anchor according to claim 1 or 2, wherein an outer contour of the washer has an oval shape. The anchor according to claim 1, 2, or 3, wherein a spacer interposed between the attachment surface and the reinforcing bar can be attached to the anchor body. A gauge for indicating the position of the surface of the reinforced concrete to be laid so as to embed a reinforcing bar can be screwed to the head of the nut member. , 3 or 4 anchor.

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