JP2002256655A - Device and sleeve for coupling reinforcing bar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase tensile strength in a device for coupling threaded reinforcing bars. SOLUTION: The coupling device 5 for coupling the threaded reinforcing bars 1 is provided with the sleeve 10, two bolts 20 and a grout material 30. Threaded holes 14, into which the respective bolts 20 are screwed, are formed in peripheral walls of right and left parts 10a and 10b of the sleeve 10. The sleeve 10 is formed with a plurality of engaging protrusions 16 on an inner peripheral surface on the other side of the threaded holes 14. The protrusions 16 are extended in a circumferential direction so as to be equal in an angle of twist to screw knots 3 of the reinforcing bar 1, and separated so as to be equal in pitch to the screw knots 3. The grout material 30 is infilled in a state in which the bolts 20 are screwed in to press the reinforcing bar 1 against the protrusions 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for connecting deformed reinforcing bars and a sleeve for connecting the devices.

[0002]

2. Description of the Related Art As shown in FIG. 6, as a device 4 for connecting deformed reinforcing bars 1 arranged on the same straight line, there is a device having a sleeve 10 ', a bolt 20 and a grout material 30. More specifically, a plurality of, for example, four ring-shaped nodes 11 are formed on both sides in the axial direction of the sleeve 10 ', that is, on the inner peripheral surfaces of the left and right portions 10a and 10b. A grout inlet 12 and an air vent 13 are formed on the peripheral wall near the left and right ends of the sleeve 10 '. Further, screw holes 14 are formed in the peripheral walls of the left and right portions 10a and 10b of the sleeve 10 '. These two screw holes 14, grout inlet 12, and air vent 1
3 is arranged on a straight line parallel to the axis of the sleeve 10 '.

The left and right portions 10a, 10a of the sleeve 10 '
b of the four nodes 11 formed on each of the sleeves 1
The node 11 located at the end of 0 'and the node 11 near the center of the sleeve 10' are formed so as to be higher at a portion opposite to the screw hole 14, and this portion has a positioning convex portion 11 which performs an operation described later.
a.

The left and right portions 10a, 10a of the sleeve 10 '
In a state where the ends of the two deformed reinforcing bars 1 are inserted into the b, two bolts 20 are screwed into the screw holes 14, and their ends are pressed against the deformed reinforcing bars 1. Thereby, each deformed reinforcing bar 1 hits the positioning protrusion 11a facing the bolt 20, and is positioned by the positioning protrusion 11a. In this state, the mortar 30 is filled from the grout injection port 13 and hardened, whereby the connection of the deformed reinforcing bars 1 and 1 is completed.

[0005]

The rebar connecting device 4 having the above-mentioned structure has a sufficient tensile strength when connecting the above-mentioned ordinary deformed rebars 1 to each other. The deformed reinforcing bar 1 has vertical ribs extending in the axial direction and bamboo-shaped horizontal ribs extending in the circumferential direction. Since the horizontal ribs are formed at a sufficient interval, the fixing force of the mortar 30 is reduced. Because it is big. When the normal deformed reinforcing bars 1 are connected to each other, the form of the final fracture at the time of pulling is not the detachment of the deformed reinforcing bar 1 from the sleeve 10 ', but the breakage of the base material of the deformed reinforcing bar 1.

However, in the case where a threaded reinforcing bar is connected as the deformed reinforcing bar 1, since the threaded portions of the threaded reinforcing bar 1 are formed at a short pitch, the fixing force of the mortar 30 is small, and therefore, the mode of final destruction at the time of pulling. However, the threaded reinforcing bar 1 may come off from the sleeve 1 in some cases.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a device for connecting the ends of two deformed rebars which are arranged in a straight line and at least one of which is a screw rebar. A sleeve having a screw hole formed in the peripheral wall of each of the above, and an engagement protrusion formed on the inner peripheral surface opposite to the screw hole; and (b) the deformed reinforcing bar screwed into the screw hole of the sleeve. And a bolt that presses against the engagement projection of the sleeve,
(C) In the reinforcing bar connecting device having the grout material filled in the sleeve, the engaging projection of the sleeve receiving the screw reinforcing bar forms a torsion angle substantially equal to the threaded section of the screw reinforcing bar in the circumferential direction. It is characterized by being extended.

[0008] Preferably, a plurality of engaging projections for receiving the screw reinforcing bar are formed at an interval equal to or a multiple of the pitch of the threaded joint of the screw reinforcing bar. Preferably, a top of the engaging projection of the sleeve has a substantially triangular cross section, and enters into the threaded bar of the threaded reinforcing bar with a gap therebetween. Preferably, the inclined surface at the top of the engaging projection has an inclination angle substantially equal to the inclined surface of the screw node having a trapezoidal cross section of the screw reinforcing bar. Preferably, a plurality of auxiliary projections extending in the circumferential direction and being lower than the engagement projections are formed on the inner peripheral surface of the sleeve on the screw hole side so as to be spaced apart in the axial direction.

Preferably, the engaging projection and the auxiliary projection are continuous to form a continuous spiral. Preferably, the two deformed reinforcing bars are both formed of threaded reinforcing bars, and the helical engaging projections are formed over substantially the entire length of the sleeve. Preferably, the diameter of the virtual cylindrical surface inscribed in the sleeve is larger than the diameter of the virtual cylindrical surface circumscribed on the screw reinforcing bar.

[0010] Further, the present invention provides a method in which 2
It is used to connect the ends of the deformed reinforcing bars of the book, has screw holes for screwing bolts on the peripheral walls on both sides in the axial direction, and engages with the inner peripheral surface on the opposite side of the screw holes. In the sleeve having the mating projections, the engagement projections for receiving the threaded rebar extend circumferentially at a predetermined twist angle.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1A, a connecting device 5 of the present embodiment is for connecting two threaded reinforcing bars 1 (irregular shaped reinforcing bars) arranged in a straight line. As shown in FIGS. 1A and 2, the screw reinforcing bar 1 includes a base 2 and a threaded joint 3 formed to face the base 2 in the radial direction. The screw section 3 is arranged on a virtual spiral having a predetermined pitch.

The connecting device 5 is, like the conventional device 4,
It comprises one sleeve 10, two bolts 20, and a mortar 30 (grout material). The sleeve 10 is
It is the same as the conventional sleeve 10 'except for the internal shape,
The grout inlet 12, the air vent 13, and the screw hole 14 are given the same numbers as in FIG. 6 and their detailed description is omitted.

FIG. 1 shows an inner peripheral surface of the sleeve 10.
As shown in FIG. 2B, a helical threaded joint 15 is formed continuously over the entire length of the sleeve 10. The pitch and the twist angle of the threaded joint 15 are equal to those of the threaded joint 3 of the threaded reinforcing bar 1. In the screw section 15, the opposite side of the screw hole 14 is the highest, and this portion is provided as an engagement projection 16. In screw section 15, screw hole 1
The part on the fourth side is the lowest first auxiliary projection 17,
The middle part is a second auxiliary projection 18 connecting the engagement projection 16 and the first auxiliary projection 17. The height of the second auxiliary projection 18 is continuously reduced from the engagement projection 16 to the first auxiliary projection 17.

In this embodiment, as shown in FIG. 2, the shape of the internal space of the sleeve 10 as viewed from the axial direction is larger than the outer shape of the screw reinforcing bar 1 as viewed from the axial direction. Further, the diameter of the virtual cylindrical surface A inscribed in the threaded joint 15 of the sleeve 10 is larger than the diameter of the virtual cylindrical surface B inscribed in the threaded joint 3 of the screw reinforcing bar 1.

As shown in FIG. 4, the engaging projections 16
It has a square shape, and its top 16x has a triangle with two inclined surfaces 16a. The inclination angle of the inclined surface 16a is equal to the inclined surface 3a of the screw node 3 having a trapezoidal cross section of the screw reinforcing bar 1.

The operation of the rebar connection device 5 having the above configuration will be described in detail. First, the two screw reinforcing bars 1, 1 are inserted into the left and right portions 10a, 10b of the sleeve 10. At the time of this insertion, it is not necessary to rotate the sleeve 10 with respect to the screw reinforcing bars 1 and 1. This is because, as described above, the shape of the internal space of the sleeve 10 as viewed from the axial direction is larger than the outer shape of the screw reinforcing bar 1 as viewed from the axial direction. In particular, in the present embodiment, the diameter of the virtual cylindrical surface A inscribed in the threaded joint 15 of the sleeve 10 is larger than the diameter of the virtual cylindrical surface B circumscribed in the threaded joint 3 of the screw reinforcing bar 1. Can be inserted without worrying about the relative angular relationship between the two.

Next, the left and right portions 10a, 10a of the sleeve 10
Two bolts 20 are screwed into the screw holes 14 of b, and the threaded rebar 1 is pressed toward the engaging projections 16 at the tips.
As a result, the base 2 of the screw reinforcing bar 1 hits the engaging protrusion 16, and as shown in FIG. 3, the engaging protrusion 16 and the screw joint 3 of the screw reinforcing bar 1 are engaged so as to overlap when viewed from the axial direction. You.
That is, as shown in FIG. 1A and FIG.
The tops 16x of the engaging projections 16 enter between the threaded joints 3.
Since the top 16x has a triangular shape, a sufficient gap C is formed between the engaging projection 16 and the screw joint 3.

Next, from the grout inlet 12 to the sleeve 10 and the two screw reinforcing bars 1 over the entire length of the sleeve 10.
The mortar 30 is filled in between. The connection step is completed by the curing of the mortar 30.

In the reinforcing bar connecting device 5 having the above-described configuration, the engaging convex portion 16 of the sleeve 10 extends in the circumferential direction at a twist angle equal to that of the screw node 3 of the screw reinforcing bar 1. (Overlap when viewed from the axial direction, that is, the state in which the locking projections 16 enter the valleys of the threaded joints 3), it is possible to increase the fixing force of the mortar 30 and to reduce the mortar 30 Even if one break occurs, a tensile resistance can be obtained by metal touch between the threaded joint 3 of the screw reinforcing bar 1 and the locking projection 16 of the sleeve 10. As a result, the mode of the final fracture at the time of tension is the
Instead, the base material of the threaded reinforcing bar 1 breaks, and a large tensile strength is obtained. In addition, the engagement projection 16
Slope 16a of the top 16x and slope 3a of the screw iron section 3
Have the same inclination angle, the contact area at the time of metal touch can be increased, so that a higher tensile strength can be obtained.

Further, since the engaging projections 16 are formed at the same pitch as the threaded joints 3 of the screw reinforcing bar 1, the number of the engaging projections 16 is increased as compared with the prior art, and the engagement between the two is increased. Has a higher strength, and thus a higher tensile strength can be obtained.

Further, since the top 16x of the engaging projection 16 has a triangular shape and a sufficient gap C is formed between the engaging projection 16 and the screw joint 3, a sufficient amount of Mortar 3
0 can be interposed, and from this point, even higher tensile strength can be obtained. The gap C can also play a role of absorbing the axial displacement between the screw reinforcing bar 1 and the sleeve 10 and a small pitch difference.

Further, the sleeve 10 has auxiliary projections 17,
18, the fixing force of the mortar 30 can be further improved, and the locking projection 16 and the auxiliary projections 17, 1
8, the continuous helical screw section 15 is formed, so that the fixing force of the mortar 30 can be further improved.

FIG. 5 shows a second embodiment of the present invention. In the figure, parts corresponding to the first embodiment are given the same numbers, and the description thereof is omitted. In this embodiment, the locking projection 16 is formed at an angle range of 120 ° on the opposite side of the screw hole 14, and a low auxiliary projection 17 is formed in the remaining angle range. Is a step 19. The point where a continuous spiral is drawn by these convex portions 16 and 17 is the first point.
This is the same as the embodiment.

It should be noted that the point farthest from the screw hole 14 may be the highest, and the point closest to the screw hole 14 may be the lowest to form a continuous spiral screw section. In this case, a predetermined angle range including the farthest point is provided as the locking projection.

The present invention is not limited to the above-described embodiment, but can adopt various forms. For example, 2
One of the deformed reinforcing bars may be a screw reinforcing bar and the other may be the above-described ordinary deformed reinforcing bar. In this case, the inner shape of one of the left and right portions of the sleeve may be as shown in FIG. 1 and the other may be as shown in FIG.

The sleeve 10 of the first embodiment may be used as it is even when one is a threaded reinforcing bar and the other is to connect normal deformed reinforcing bars, or when connecting normal deformed reinforcing bars to each other.

The auxiliary projections 17 and 18 may be omitted, or may be bamboo-shaped instead of spiral. The plurality of engaging projections 16 may be arranged at intervals of a multiple of the pitch of the threaded section of the screw reinforcing bar.

When the virtual cylindrical surface circumscribing the screw rebar is larger than the virtual cylindrical surface inscribed in the sleeve, the end of the screw rebar may be inserted into the sleeve while rotating the sleeve or the screw rebar. .

[0029]

As described above, according to the present invention, the engagement between the engagement convex portion of the sleeve and the threaded joint of the screw rebar causes
The adhesive strength of the mortar can be increased,
Even if the mortar is broken, a large tensile strength can be obtained because the locking projections and the screw nodes have a metal touch. Further, a larger tensile strength can be obtained by the engagement between the plurality of engagement protrusions and the screw joints. In addition, since the top of the engaging projection is made triangular to increase the gap between the engaging projection and the threaded joint, and a sufficient amount of grout material is interposed here, a greater tensile strength is obtained. be able to. Since the inclined surface of the engaging projection is substantially equal to the inclined surface of the screw joint, the contact surface can be increased in the case of metal touch, and a higher tensile strength can be obtained. Further, the fixing force of the grout material can be improved by the auxiliary convex portion, and the fixing force can be further improved by connecting the auxiliary convex portion and the locking convex portion.

[Brief description of the drawings]

1A and 1B show a first embodiment of the present invention, in which FIG. 1A is a longitudinal sectional view of a connecting device showing a state in which screw rebars are connected, FIG.
FIG. 2 is a longitudinal sectional view showing a sleeve of the coupling device.

FIG. 2 is an enlarged cross-sectional view showing a state where a threaded reinforcing bar is inserted into the sleeve.

FIG. 3 is an enlarged cross-sectional view showing a state where the screw rebar is pressed by a bolt screwed into the sleeve.

FIG. 4 is an enlarged longitudinal sectional view of a main part showing a threaded section of a threaded rebar and a locking projection of a sleeve.

FIG. 5 is a diagram corresponding to FIG. 2A showing a second embodiment of the present invention.

FIG. 6 is a longitudinal sectional view showing a conventional connecting device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 screw reinforcing bar (irregular reinforcing bar) 3 screw joint 3 a inclined surface of screw joint 10 sleeve 14 screw hole 16 locking convex portion 16 a inclined surface of locking convex portion 16 x top of locking convex portion 17, 18 auxiliary convex portion 20 bolt 30 Mortar (grout material)

Claims (9)

[Claims] 1. A device for connecting the ends of two deformed reinforcing bars, which are arranged on a straight line and at least one of which is a screw reinforcing bar, comprises: (a) screws formed on peripheral walls on both sides in the axial direction, respectively. A sleeve having a hole and an engagement protrusion formed on the inner peripheral surface opposite to the screw hole; and (b) connecting the deformed reinforcing bar screwed into the screw hole of the sleeve to the engagement protrusion of the sleeve. In a rebar connection device including a pressing bolt and (c) a grout material filled in the sleeve, the engagement protrusion of the sleeve for receiving the screw rebar has a torsion angle substantially equal to a screw joint of the screw rebar. A reinforcing-bar connecting device extending in a circumferential direction. 2. The reinforcing bar connecting device according to claim 1, wherein a plurality of engaging projections for receiving the screw reinforcing bar are formed at intervals equal to or a multiple of a pitch of a threaded joint of the screw reinforcing bar. . 3. The reinforcing bar connection according to claim 1, wherein a top of the engaging convex portion of the sleeve has a substantially triangular cross section, and enters through a gap between the screw nodes of the screw reinforcing bar. apparatus. 4. The inclined surface at the top of the engaging projection has an inclination angle substantially equal to the inclined surface of a threaded knot having a trapezoidal cross section of the threaded reinforcing bar. Rebar connection device. 5. A plurality of auxiliary projections extending in the circumferential direction and being lower than the engagement projections are formed on the inner peripheral surface of the sleeve on the screw hole side and are spaced apart in the axial direction. The reinforcing-bar connection device according to any one of claims 2 to 4. 6. The reinforcing-bar connection device according to claim 5, wherein the engaging projection and the auxiliary projection form a continuous spiral. 7. The method according to claim 2, wherein the two deformed reinforcing bars are both threaded reinforcing bars, and the helical engaging projections are formed over substantially the entire length of the sleeve.
7. The reinforcing-bar connection device according to any one of claims 6 to 6. 8. The rebar connection device according to claim 1, wherein a diameter of a virtual cylindrical surface inscribed in the sleeve is larger than a diameter of a virtual cylindrical surface inscribed in the screw reinforcing bar. . 9. A screw hole for connecting ends of two deformed reinforcing bars arranged on a straight line with each other, and having screw holes for screwing bolts to peripheral walls on both sides in the axial direction. In a sleeve having an engagement projection formed on an inner peripheral surface opposite to the screw hole, the engagement projection for receiving the screw rebar extends circumferentially at a predetermined twist angle. Reinforcing bar connection sleeve.