JP2009167718A - Joint bar anchor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint bar anchor used when a joint bar is fitted afterwards to an existing concrete skeleton (slab), by which breakage etc. of the joint bar caused by folding is prevented. <P>SOLUTION: An expansively opening part 13 with slits 13a which expansively opens by the insertion of a wedge body 12 under pressure is arranged on a front end side of an anchor body 11, and a female screw part 14 into which a male screw part 5b arranged at a front end of the joint bar 5 is screwed is formed on the base end side. A nonscrewed part 15 having the inner diameter larger than that of the female screw part 14 and similar to or larger than the outer diameter of the joint bar body part 5a is formed in an extending manner on the base end side of the female screw part 14. In the state that the male screw part 5b of the joint bar 5 is screwed into the female screw part 14 of the anchor body 11, the joint bar body part 5a is fitted to the nonscrewed part 15 so that the folding fulcrum F may be positioned at the fitted part when a folding force is applied to the joint bar 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a reinforcing bar anchor used when retrofitting a reinforcing bar to an existing concrete slab.

  6 to 8 show a conventional piercing anchor and piercing bar.

  The incision bar anchor is constituted by a cylindrical anchor body 1 and a wedge body 2.

  The anchor body 1 has a widened portion 3 with a plurality of slits 3a... In which the wedge body 2 is press-fitted and widened on the distal end side, and a male screw portion 5b (provided on the distal end portion of the insertion bar 5 on the proximal end side). 5a is provided with a female thread portion 4 into which a threaded main body portion not threaded) is screwed, and a concrete frame (hereinafter referred to as a wedge) with the wedge body 2 inserted into the expanded portion 3 as shown in FIG. It is inserted into the hole W1 of W).

  In this state, the anchor body 1 is driven into the back of the hole by a pipe-shaped driving tool (not shown), so that the wedge body 2 is press-fitted into the expanded portion 3.

  As a result, as shown in FIG. 8, the expanding portion 3 expands in the hole W <b> 1 and bites into the peripheral wall of the hole, and the entire anchor is fixed to the housing W.

  Thereafter, the male threaded portion 5 b of the insertion bar (usually deformed reinforcing bar) 5 is screwed and fixed to the female threaded portion 4 of the anchor body 1.

The above configuration is shown in Patent Document 1.
JP 2000-265570 A

In conventional anchors,
(I) The female thread portion 4 of the anchor main body 1 is provided over almost the entire base end side of the main body 1 as shown in the figure,
(Ii) A1 <A2 is set, where A1 is the inner diameter dimension of the female thread portion 4 (= the outer diameter dimension of the insertion thread male thread section 5b), and A2 is the outer diameter dimension of the insertion bar main body portion 5a.
From these two points, only the male screw portion 5b enters the anchor main body 1 in the state where the reinforcing bar is attached as shown in FIG. 8, and all the reinforcing bar main body portions 5a are exposed to the outside of the anchor main body 1.

  On the other hand, at the construction site, after attaching a large number of incisors to the housing W, those that obstruct walking and work are bent to the housing W side as shown by the two-dot chain line in FIG. There are many cases of bending back into the street.

  In this case, in the conventional anchor, the proximal end portion where the female screw portion 4 of the anchor body 1 and the male screw portion 5b of the insertion bar 5 are in contact with each other serves as a fulcrum F for bending (including bending back).

  Since the insertion thread male screw portion 5b where the fulcrum F is located is a portion that is weaker in strength than the main body portion 5a by threading (cutting), it is broken or close to the state by repeated bending and unbending, There has been a problem that the reinforcing function of can not be fulfilled.

  Therefore, the present invention provides an incision anchor that can prevent breakage or the like due to bending of the incisor.

  The present invention comprises a cylindrical anchor body and a wedge body. The anchor body has a slit-opening portion on which the wedge body is press-fitted and expanded on the distal end side, and an insertion bar distal end on the proximal end side. In the anchor provided with the female screw part into which the male screw part provided in the screw is respectively provided, a non-threaded part having an inner diameter larger than the female screw part is provided at the base end part of the anchor body, and the male screw part of the insertion bar is the anchor. When inserted into the female threaded part of the main body, the insertion bar main body part that is not male threaded is fitted into the unthreaded part, and the bending fulcrum when the bending force is applied to the insertion line is located at this fitting part. It is comprised so that it may do.

  According to the present invention, the main portion of the incisor is fitted into the unthreaded portion of the anchor main body, and the bending fulcrum when the bending force is applied to the incisor is the fitting portion, that is, there is no strength reduction due to screw processing. Since it is located at the portion, it is possible to reliably prevent breakage of the incisor by bending or bending back.

  In addition, since it is only necessary to integrally extend the screwless portion on the base end side of the anchor main body, there is no possibility that the processing steps are increased or complicated, which is advantageous in terms of cost.

  An embodiment of the present invention will be described with reference to FIGS.

  In each figure, 11 is an anchor body, and 12 is a wedge body. FIG. 1 is a partially cutaway view of the proximal end side of the anchor body 11.

  The anchor body 11 has a widened portion 13 with a plurality of slits 13a that is expanded by being pressed into a wedge body 12 on the distal end side, and a male screw portion 5a (5b) provided at the distal end portion of the insertion bar 5 on the proximal end side. Are provided with female thread portions 14 into which unthreaded insertion bar main body portions) are screwed, and further on the proximal end side (base end portion of the anchor main body) of the female screw portions 14 are unthreaded portions 15 that are not female threaded. Is formed as a single unit.

Here, as shown in FIG. 2, the inner diameter dimension of the female screw portion 14 is A1, the outer diameter dimension of the insertion bar main body portion 5a is A2, and the inner diameter dimension of the non-threaded portion 15 is A3.
A1 <A2 ≦ A3
Is set to

  In general, A3 is the same as A2 or slightly larger. Further, the overall length of the anchor main body 11 is longer than the conventional anchor main body 1 shown in FIGS.

  The following operations are obtained by setting the configuration and dimensions.

  The fixing method of the anchor body 11 to the housing W is the same as the conventional method. That is, as shown in FIG. 3, the entire anchor is inserted into the hole W1 provided in the housing W (the anchor body 11 is formed deeper as the anchor body 11 becomes longer) with the wedge body 12 inserted into the expanded portion 13. Then, the anchor body 11 is driven into the inner side of the hole with a driving tool to press-fit the wedge body 12 into the expanded portion 13.

  As a result, as shown in FIG. 4, the anchor main body 11 is immersed in the hole W1, and the expanded portion 13 is expanded to bite into the peripheral wall of the hole. Is screwed and fixed to the female threaded portion 14 of the anchor body 11.

  Here, with the dimension setting of A1 <A2 ≦ A3, as shown in FIG. 4, the bending bar main body portion 5a is fitted into the non-threaded portion 15, and the bending fulcrum F when the bending force is applied to the cutting bar 5 is It is located in this fitting part.

  The length dimension L of the non-threaded portion 15 (for example, the same as the outer diameter A2 of the incisor main body portion 5a, see FIG. 2) is set so that the bending fulcrum F is located at a position sufficiently away from the female threaded portion 14. Has been.

  In this way, the bending fulcrum F is positioned on the incisor main body portion 5a having a strength higher than that of the female screw portion 14 without a decrease in strength due to the screw processing, thereby preventing the bending of the incisor 5 and the breakage due to the bending back. The original reinforcing function of the incisor can be secured.

  Moreover, since it is only necessary to integrally extend the unthreaded portion 15 on the base end side when the anchor main body 11 is manufactured, there is no possibility of increasing or complicating processing steps, which is advantageous in terms of cost.

  In the above embodiment, the anchor 5 is screwed into the anchor W after the anchor is fixed to the housing W. However, as shown in FIG. At the time of construction, a method may be adopted in which the anchor is driven into the housing W and the anchor and the reinforcing bar 5 are fixed simultaneously.

  In this case, the anchor 5 may be directly struck and the anchor may be driven into the housing hole W, or the anchor may be driven in a state where a pipe-shaped driving tool is put on the reinforcing bar 5.

  In addition, the unthreaded portion 15 of the anchor main body 11 is prevented from being loosened or rattling because the driving force at this time is applied to the threaded portion of the female threaded portion 14 of the anchor main body 11 and the male threaded portion 5b of the insertion bar 5. It is desirable to caulk on the main body portion 5a of the incisor bar 5 (for example, the non-threaded portion 15 is partially pressed from the outer periphery and crimped to the incisor main body portion 5a).

It is a perspective view of an anchor and an insertion line concerning an embodiment of the present invention. FIG. It is sectional drawing of the state which inserted the anchor into the hole of a concrete frame. It is a sectional view in the state where the anchor was driven and fixed in the hole, and the incisor was screwed. FIG. 6 is a view corresponding to FIG. 3 for explaining another anchor driving method. It is a perspective view of the conventional anchor and insertion line. It is sectional drawing of the state which inserted the anchor into the hole of a concrete frame. It is a sectional view in the state where the anchor was driven and fixed in the hole, and the incisor was screwed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 5 Insertion bar 5a Insertion bar main-body part 5b Insertion male screw part 11 Anchor main body 12 Wedge body 13 Expanding part 14 Female thread part 15 Unthreaded part W Concrete frame W1 Hole of concrete frame A1 Internal diameter of female screw part A2 Insertion bar main-body part Outside diameter A3 Inside diameter of screwless part F Folding fulcrum

Claims (1)

  The anchor body is composed of a cylindrical anchor body and a wedge body, and the anchor body is provided at the distal end side, at the distal end side, with an expanding portion with a slit to which the wedge body is pressed and expanded, and at the proximal end side, at the distal end of the insertion bar. In the anchor provided with the female screw part into which the male screw part is screwed, a non-threaded part having a larger inner diameter than the female screw part is provided at the base end part of the anchor main body, and the male screw part of the insertion bar is the female screw part of the anchor main body. The insertion bar main body part that is not male threaded is fitted into the unthreaded part, and the bending fulcrum when the bending force is applied to the insertion line is located at this fitting part. An incisor anchor characterized by

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