JP2008075417A - Connecting method for irregular bar - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To overcome the following problems: much labor is required and a connection component and a job site are contaminated with a filler, because a resin or the like is infilled on the job site, in the use of the filler; and the reliability of connection can hardly maintained because a lock nut can be loosened by a tension during the use of the lock nut. <P>SOLUTION: A halved biting splicing member, in which many protrusions are formed on an inner surface, in which a screw is formed on an outer surface and which is formed in such a tapered shape as to become thin at an end and thicker toward the center, is cylindrically formed by being assembled in such a manner as to cover a connecting portion of the deformed bar. The lock nut is screwed to the screw on the outer surface. The bite type attached member decreases in diameter in accordance with the screwing of the lock nut, so that the protrusion on the inner surface can be brought into pressure contact with the surface of the deformed bar. Consequently, the irregular bar can be surely connected by utilizing performance equivalent to a mechanical joint, and the connected state of the irregular bar can be stably maintained. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for connecting deformed reinforcing bars that connect a pair of deformed reinforcing bars without using a filler.

Conventionally, in order to connect screw rebars used in a high-rise building or the like, a pair of screw rebars to be connected is screwed into screws in a fitting member and connected.
However, since the bite attachment member is not accurate enough and rattling occurs, as shown in Patent Document 1, a hole is made in the peripheral surface of the bite attachment member, and resin or mortar is placed in the bite attachment member. To prevent rattling even when tension is applied.
Moreover, as shown in Patent Document 2, there is a type in which a lock nut screwed into each of the threaded reinforcing bars is inserted and tightened toward both end surfaces of the attachment member without using a filler.

Japanese Patent Laid-Open No. 11-107445 (see FIG. 1) JP 2004-238869 A (see FIG. 2)

Since the conventional screw rebar connection method is performed as described above, the one disclosed in Patent Document 1 cannot confirm from the outside whether or not the filler is sufficiently filled, and the connection is ensured. Cannot recognize sex. In addition, filling a resin or the like at a work site is time-consuming, and there are problems such as fouling connection parts and the work site with a filler.
Moreover, in the thing using the lock nut shown by patent document 2, there exists a possibility that a lock nut may loosen by tension | tensile_strength during use, and there existed a subject in maintaining the reliability of a connection.
Then, instead of screws on the surface as described above, the adhesiveness of the concrete was improved by attaching or deforming a cleaver (protrusions perpendicular to or oblique to the axis) or ribs (protrusions in the axial direction). The above-mentioned connection method cannot be applied to deformed reinforcing bars, and there is a problem that there is no mechanical joint for deformed reinforcing bars at present.

  The present invention has been made in order to solve the above-described conventional problems, and provides a method for connecting deformed reinforcing bars that can be easily connected to a pair of deformed reinforcing bars without using a filler. For the purpose.

  The method for connecting deformed reinforcing bars according to the present invention is such that a pair of deformed reinforcing bars to be connected and a large number of convex portions are formed on the inner surface, screws are formed on the outer surface, and the end portions are thin and become thicker toward the center. A two-part biting attachment member formed in a taper shape, and a lock nut screwed into a screw of the biting attachment member assembled into a cylindrical shape so as to cover the connection portion of the deformed reinforcing bar, The biting attachment member is reduced in diameter toward the deformed reinforcing bar side by a tapered slope according to the tightening of the lock nut, and the convex portion of the inner surface is pressed against the surface of the deformed reinforcing bar.

  According to the present invention, the two-part biting attachment member formed in a taper shape is assembled so as to cover the connecting portion of the deformed reinforcing bar to form a cylindrical shape, and the lock nut is screwed onto the screw on the outer surface of the biting attachment member. Since the convex part on the inner surface of the biting attachment member is pressed against the surface of the deformed reinforcing bar and the pair of deformed reinforcing bars are firmly fastened, a mechanical type can be obtained by making the biting attachment member a metal. The same performance as the joint can be obtained. Further, it is not necessary to use a filler such as resin or mortar. Therefore, there is no need to fill a resin or the like at the work site, the work at the site is simple, and there is an effect that the pair of deformed reinforcing bars can be connected inexpensively and reliably without contaminating the connection parts and the work site with the filler. .

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.
Embodiment 1 FIG.
FIG. 1 is a longitudinal sectional view of a bite attachment member and a lock nut for explaining a method for connecting deformed reinforcing bars according to Embodiment 1 of the present invention. FIG. 2 is an explanatory view of the deformed reinforcing bar connecting step according to the present invention. FIG. 3 and FIG. 4 are explanatory views of the deformed reinforcing bar connecting step according to the present invention, partially enlarged. 5A and 5B are views showing the bite attachment member, wherein FIG. 5A is a longitudinal sectional view taken along line aa in FIG. 5B, and FIG. 5B is an end view. FIG. 6 is a view showing a lock nut, in which (a) is a longitudinal sectional view and (b) is an end view.

  In the figure, a biting attachment member 3 for connecting a pair of deformed reinforcing bars 1 and 2 is obtained by dividing a cylindrical body into two parts as shown in FIG. The screw 4 is formed, and the end portion is formed in a taper shape (thickness difference t) so as to become thicker toward the center. The pair of deformed reinforcing bars 1 and 2 has a male screw 5 formed as a protrusion over the entire length, and both sides are missing in the axial direction and finished to a flat surface 6. The lock nut 7 shown in FIG. 6 is screwed into a screw 4 on the outer surface of the biting attachment member 3 which is assembled so as to cover the connection portion of the deformed reinforcing bar and is cylindrical.

  Next, the connection work of the deformed reinforcing bars 1 and 2 will be described. First, as shown in FIG. 1, after a lock nut 7 is fitted to each of a pair of deformed reinforcing bars 1 and 2 to be connected, the ends of the pair of deformed reinforcing bars 1 and 2 are brought into contact with each other in a straight line. The two bite attachment members 3 are assembled so as to cover the contact portion, and are closed in a cylindrical shape. Then, the lock nut 7 is screwed onto the screw 4 on the outer surface of the biting attachment member 7. Following this screwing, the biting attachment member 3 is reduced in diameter toward the deformed rebars 1 and 2 by the tapered slope, and the convex portion 3a on the inner surface is pressed against the surface of the deformed rebars 1 and 2. Accordingly, the pair of deformed reinforcing bars 1 and 2 are firmly and integrally connected by the biting attachment member 3 and the lock nut 7. In this state, the biting attachment member is applied with a force in a direction away from the deformed reinforcing bar by the repulsive force of the convex portion 3a pressed against the surface of the deformed reinforcing bar. As a result, the thread of the biting attachment member 3 and the thread of the lock nut are in close contact with each other so that the lock nut does not loosen.

  In this connection work, a fluorine-based synthetic resin, for example, Teflon (registered trademark) is wound around the screw 4 of the biting attachment member 3 like a tape. In this way, the friction is reduced, a tightening force greater than the normal tightening torque is obtained, and the deformed rebars 1 and 2 and the biting attachment member 3 can be tightened together more firmly.

  The drawing shows deformed rebars 1 and 2 having a male screw 5 formed over the entire length and lacking both sides in a plane. The deformed rebars 1 and 2 are deformed by attaching at least the surface and ribs. Anything is acceptable. Further, the deformed reinforcing bars 1 and 2 may have a circular cross section without making both side surfaces flat.

  As described above, according to the present invention, the tapered biting attachment member is assembled into a cylindrical shape so as to cover the connecting portion of the deformed reinforcing bar, and the screw on the outer surface of the biting attachment member Since the lock nut is screwed onto and the convex portion on the inner surface of the biting attachment member is pressed against the surface of the deformed reinforcing bar so that the pair of deformed reinforcing bars are firmly fastened, the biting attachment member is made of metal. As a result, performance equivalent to that of a mechanical joint can be obtained. In addition, after the pair of deformed reinforcing bars are firmly fastened via the biting attachment member, the biting attachment member is applied with a force in a direction away from the deformed reinforcing bar due to the repulsive force of the convex portion pressed against the surface of the deformed reinforcing bar. It is done. As a result, the thread of the biting attachment member and the thread of the lock nut are in close contact with each other, so that the lock nut does not loosen, and a stable connection state can be maintained. Further, it is not necessary to use a filler such as resin or mortar. Therefore, there is no need to fill a resin or the like at the work site, the work at the site is simple, and there is an effect that a pair of deformed reinforcing bars can be connected inexpensively and reliably without contaminating the connection parts and the work site with the filler. .

FIG. 1 is a longitudinal sectional view of a biting attachment member for explaining a method for connecting deformed reinforcing bars according to Embodiment 1 of the present invention. It is explanatory drawing of the connection process of the deformed reinforcing bar by this invention. It is explanatory drawing of the connection process of the deformed reinforcing bar by this invention which expanded and showed one part. It is explanatory drawing of the connection process of the deformed reinforcing bar by this invention which expanded and showed one part. It is a figure which shows a biting attachment member, (a) is a longitudinal cross-sectional view which follows the aa line, (b) is an end elevation. It is a figure which shows a lock nut, (a) is a longitudinal cross-sectional view, (b) is an end view.

Explanation of symbols

1, 2 A pair of deformed bars 1, 2
3 Biting member 4 Female screw 5 Male screw 6 Plane 7 Lock nut

Claims (3)

A pair of deformed reinforcing bars to be connected, a number of protrusions formed on the inner surface, screws formed on the outer surface, and a two-part bite formed in a tapered shape so that the end is thin and thicker toward the center A fitting member and a lock nut that is assembled to cover the connecting portion of the deformed reinforcing bar to be cylindrical and screwed into the screw of the biting attachment member, the biting attachment member according to tightening of the lock nut, A deformed reinforcing bar connecting method, characterized in that the diameter of the deformed reinforcing bar is reduced to a deformed reinforcing bar side by a tapered slope, and a convex portion of the inner surface is pressed against the surface of the deformed reinforcing bar. 2. The deformed reinforcing bar connecting method according to claim 1, wherein the biting attachment member is made of metal. 3. The deformed reinforcing bar connecting method according to claim 1, wherein a fluorine-based synthetic resin is fixed to a thread portion of a biting attachment member into which a lock nut is screwed.

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