JP3771136B2 - Rebar connecting device and rebar connecting sleeve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a device for connecting deformed reinforcing bars to each other and a sleeve for this connection.
[0002]
[Prior 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 type including 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 side portions in the axial direction of the sleeve 10 ′, that is, on the inner peripheral surfaces of the left and right portions 10a and 10b. Grout inlets 12 and air vents 13 are formed in the peripheral walls near the left and right ends of the sleeve 10 '. In addition, 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, the grout inlet 12 and the air vent 13 are arranged on a straight line parallel to the axis of the sleeve 10 '.
[0003]
Of the four nodes 11 formed on the left and right portions 10a and 10b of the sleeve 10 ', the node 11 located at the end of the sleeve 10' and the node 11 near the center of the sleeve 10 'are opposite to the screw holes 14. The site | part of the side is formed highly, and this site | part is provided as the positioning convex part 11a which makes the effect | action mentioned later.
[0004]
With the ends of the two deformed reinforcing bars 1 inserted into the left and right portions 10 a and 10 b of the sleeve 10 ′, the two bolts 20 are screwed into the screw holes 14, and the tips thereof are pressed against the deformed reinforcing bar 1. Thereby, each deformed reinforcing bar 1 hits the positioning convex portion 11a facing the bolt 20 and is positioned by the positioning convex portion 11a. In this state, the mortar 30 is filled from the grout inlet 13 and hardened to complete the connection of the deformed reinforcing bars 1 and 1.
[Problems to be solved by the invention]
The reinforcing bar connecting device 4 having the above configuration has sufficient tensile strength when connecting the above-described ordinary deformed reinforcing bars 1 to each other. The deformed reinforcing bar 1 has a longitudinal rib extending in the axial direction and a bamboo rib-shaped lateral rib extending in the circumferential direction, and the lateral ribs are formed at a sufficient interval. Because it is big. When normal deformed reinforcing bars 1 are connected to each other, the final breaking mode at the time of pulling is not the deformation of the deformed reinforcing bar 1 from the sleeve 10 ′, but the base metal breakage of the deformed reinforcing bar 1.
[0006]
However, when connecting a threaded reinforcing bar as the deformed reinforcing bar 1, since the screw nodes of the threaded reinforcing bar 1 are formed at a short pitch, the fixing force of the mortar 30 is small, so that the final breaking mode when pulled is the sleeve In some cases, the threaded reinforcing bar 1 may come out of the thread 1.
[0007]
[Means for Solving the Problems]
The present invention is an apparatus for connecting the ends of two deformed reinforcing bars that are arranged in a straight line and at least one of which is a threaded reinforcing bar,
(A) a sleeve having a screw hole formed in each peripheral wall on both sides in the axial direction and an engaging convex portion formed on the inner peripheral surface on the opposite side of the screw hole;
(B) a bolt that is screwed into the screw hole of the sleeve and presses the deformed reinforcing bar against the engagement convex portion of the sleeve;
(C) a grout material filled in the sleeve;
In a reinforcing bar coupling device comprising:
The engaging convex part of the sleeve that receives the threaded reinforcing bar extends in the circumferential direction with a twist angle substantially equal to the threaded joint of the threaded reinforcing bar, and enters between the threaded joints of the threaded reinforcing bar via a gap. Filled with the grout material,
A plurality of auxiliary convex portions extending in the circumferential direction and lower than the engaging convex portions are formed on the inner peripheral surface of the sleeve on the screw hole side and separated in the axial direction .
[0008]
Preferably, a plurality of engaging convex portions for receiving the screw rebar are formed at intervals equal to or a multiple of the pitch of the screw nodes of the screw rebar.
Preferably, the top of the engaging convex portion of the sleeve has a substantially triangular cross section.
Preferably, the inclined surface at the top of the engaging convex portion has an inclination angle substantially equal to the inclined surface of the screw node having a trapezoidal cross section of the screw rebar.
[0009]
Preferably, the engaging convex portion and the auxiliary convex portion are connected to form a continuous spiral.
[0010]
Furthermore, the present invention is used for connecting ends of two deformed reinforcing bars arranged on a straight line and at least one of which is a threaded reinforcing bar, for screwing bolts to peripheral walls on both sides in the axial direction. In the sleeve having a screw hole and forming an engagement convex portion on the inner peripheral surface on the opposite side of the screw hole,
The engaging convex portion that receives the screw rebar extends in the circumferential direction with a twist angle substantially equal to the screw node of the screw rebar, and enters through a gap between the screw nodes of the screw rebar,
A plurality of auxiliary convex portions extending in the circumferential direction and lower than the engaging convex portions are formed on the inner peripheral surface of the sleeve on the screw hole side and separated in the axial direction .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. As shown to FIG. 1 (A), the connection apparatus 5 of this embodiment is for connecting the two screw reinforcement 1 (deformed reinforcement) arrange | positioned on a straight line. As shown in FIGS. 1A and 2, the screw rebar 1 includes a base 2 and a screw node 3 formed so as to face the radial direction of the base 2. The screw node 3 is arranged on a virtual spiral having a predetermined pitch.
[0012]
The connecting device 5 includes one sleeve 10, two bolts 20, and a mortar 30 (grouting material), as in the conventional device 4. The sleeve 10 is the same as the conventional sleeve 10 'except for the internal shape, and the grout inlet 12, the air vent 13, and the screw hole 14 are assigned the same numbers as in FIG. .
[0013]
On the inner peripheral surface of the sleeve 10, as shown in FIG. 1B, a spiral screw node 15 that is continuous over the entire length of the sleeve 10 is formed. The pitch and the twist angle of the screw node 15 are equal to those of the screw node 3 of the screw rebar 1. In this screw node 15, the opposite side of the screw hole 14 is the highest, and this portion is provided as the engaging projection 16. Further, in the screw joint 15, the portion on the screw hole 14 side is the lowest first auxiliary convex portion 17, and the second auxiliary convex portion connecting the engaging convex portion 16 and the first auxiliary convex portion 17 in the middle thereof. It is 18. The second auxiliary convex portion 18 is configured such that the height continuously decreases from the engaging convex portion 16 toward the first auxiliary convex portion 17.
[0014]
In the present embodiment, as shown in FIG. 2, the shape of the internal space of the sleeve 10 viewed from the axial direction is larger than the external shape of the screw rebar 1 viewed from the axial direction. Moreover, the diameter of the virtual cylindrical surface A that is inscribed in the threaded joint 15 of the sleeve 10 is larger than the diameter of the virtual cylindrical surface B that is circumscribed in the threaded joint 3 of the screw rebar 1.
[0015]
As shown in FIG. 4, the engaging projection 16 has a pentagonal shape, and the apex 16x has two inclined surfaces 16a to form a triangle. 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 rebar 1.
[0016]
The operation of the reinforcing bar connecting device 5 having the above configuration will be described in detail. First, the two screw rebars 1 and 1 are inserted into the left and right portions 10 a and 10 b of the sleeve 10. In this insertion, it is not necessary to turn the sleeve 10 with respect to the screw rebars 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 external shape of the screw rebar 1 as viewed from the axial direction. In particular, in the present embodiment, the diameter of the virtual cylindrical surface A that is inscribed in the screw node 15 of the sleeve 10 is larger than the diameter of the virtual cylindrical surface B that is in contact with the screw node 3 of the screw rebar 1. Can be inserted without worrying about the relative angular relationship.
[0017]
Next, the two bolts 20 are screwed into the screw holes 14 of the left and right portions 10 a and 10 b of the sleeve 10, and the screw rebar 1 is pressed toward the engaging convex portion 16 at the tip thereof. As a result, the base portion 2 of the screw rebar 1 hits the engagement convex portion 16, and the engagement convex portion 16 and the screw node 3 of the screw rebar 1 are engaged so as to overlap when viewed from the axial direction as shown in FIG. The That is, as shown in FIGS. 1A and 4, the top portion 16 x of the engaging convex portion 16 enters between the screw nodes 3 of the screw rebar 1. Since the top portion 16x has a triangular shape, a sufficient gap C is formed between the engaging convex portion 16 and the screw node 3.
[0018]
Next, the mortar 30 is filled between the sleeve 10 and the two screw rebars 1 from the grout inlet 12 over the entire length of the sleeve 10. The linking process is completed by curing the mortar 30.
[0019]
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 the same twist angle as that of the screw node 3 of the screw reinforcing bar 1, and the engaging convex portion 16 and the screw node 3 are engaged. (The overlap when viewed from the axial direction, that is, the state in which the locking projection 16 enters the valley of the screw joint 3) can increase the fixing force of the mortar 30, and the mortar 30 is destroyed by any chance. However, the pulling resistance by the metal touch of the threaded joint 3 of the screw rebar 1 and the locking projection 16 of the sleeve 10 can be obtained. As a result, the mode of final fracture at the time of pulling is not the pull-out of the screw rebar 1 from the sleeve 10, but the base material fracture of the screw rebar 1 and a large tensile strength is obtained.
Moreover, since the inclined surface 16a of the top portion 16x of the engaging convex portion 16 and the inclined surface 3a of the screw iron node 3 have the same inclination angle, the contact area at the time of metal touch can be increased. Greater tensile strength can be obtained.
[0020]
Furthermore, since the engagement convex part 16 is formed with the same pitch as the screw joint 3 of the screw rebar 1, the number of the engagement convex parts 16 is increased as compared with the conventional case, and the engagement between both is further strengthened. As a result, even greater tensile strength can be obtained.
[0021]
Further, since the apex portion 16x of the engaging convex portion 16 has a triangular shape and a sufficient gap C is formed between the engaging convex portion 16 and the screw node 3, a sufficient amount of mortar 30 is provided. From this point, even greater tensile strength can be obtained. The gap C can also play a role of absorbing the axial displacement between the screw rebar 1 and the sleeve 10 and a small pitch difference.
[0022]
Further, the sleeve 10 can further improve the fixing force of the mortar 30 by the auxiliary convex portions 17 and 18, and further, the helical screw node 15 that is continuous by the locking convex portion 16 and the auxiliary convex portions 17 and 18 can be provided. Since it forms, the fixing power of the mortar 30 can be further improved.
[0023]
FIG. 5 shows a second embodiment of the present invention. In the figure, parts corresponding to those of the first embodiment are denoted by the same reference numerals and description thereof is omitted. In this embodiment, the locking convex portion 16 is formed in an angle range of 120 ° on the opposite side of the screw hole 14, and the low auxiliary convex portion 17 is formed in the remaining angular range, and both convex portions 16, 17 are formed. The border is 19 steps. The point which draws the continuous spiral by these convex parts 16 and 17 is the same as that of 1st Embodiment.
[0024]
It is also possible to form a screw node that forms a continuous spiral with the point farthest from the screw hole 14 being the highest and the point closest to the screw hole 14 being the lowest. In this case, a predetermined angle range including the farthest point is provided as the locking projection.
[0025]
The present invention is not limited to the above embodiment, and various forms can be adopted. For example, one of the two deformed reinforcing bars to be connected may be a threaded reinforcing bar and the other may be the above-described ordinary deformed reinforcing bar. In this case, one internal shape of the left and right portions of the sleeve may be as shown in FIG. 1, and the other internal shape may be as shown in FIG.
[0026]
Even when one is a threaded reinforcing bar and the other is a normal deformed reinforcing bar or when connecting normal deformed reinforcing bars, the sleeve 10 of the first embodiment may be used as it is.
[0027]
The auxiliary convex portions 17 and 18 may be omitted, or may be bamboo knot instead of spiral.
The plurality of engaging protrusions 16 may be arranged at an interval that is a multiple of the pitch of the screw nodes of the screw rebar.
[0028]
If 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 turning the sleeve or the screw rebar.
[0029]
【The invention's effect】
According to the present invention described above, by the engagement of the threaded section of the engagement projection and threaded rebar sleeve, it is possible to increase the adhesion of grout, engages be destroyed grout since engagement projection and the screw section is metal touch, it is possible to obtain a high tensile strength.
Further, a greater tensile strength can be obtained by the engagement of the plurality of engaging projections with the screw nodes.
In addition, since the top of the engaging convex portion is triangular and the gap between the engaging convex portion and the screw node is increased and a sufficient amount of grout material is interposed therein, a higher tensile strength is obtained. be able to.
Since the inclined surface of the engaging convex portion and the inclined surface of the screw node are substantially equal, the contact surface can be increased during metal touch, and a higher tensile strength can be obtained.
Further, the auxiliary protruding portion can be improved fixing strength of the grout, by continuous and auxiliary protrusions and the engaging protrusion, it is possible to further improve the fixing force.
[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 where screw rebars are connected, and FIG. 1B is a longitudinal sectional view showing a sleeve of the connecting device; .
FIG. 2 is an enlarged cross-sectional view showing a state in which screw rebars are inserted into the sleeve.
FIG. 3 is an enlarged cross-sectional view showing a state in which the screw rebar is pressed with a bolt screwed into the sleeve.
FIG. 4 is an enlarged vertical cross-sectional view of a main part showing a screw node of a threaded reinforcing bar and a locking projection of a sleeve.
FIG. 5 is a view corresponding to FIG. 2 (A) showing a second embodiment of the present invention.
FIG. 6 is a longitudinal sectional view showing a conventional connecting device.
[Explanation of symbols]
1 Screw rebar (deformed bar)
3 Screw Node 3a Inclined Surface 10 of Screw Node Sleeve 14 Screw Hole 16 Locking Convex 16a Locking Convex Inclined Surface 16x Locking Convex Top 17 and 18 Auxiliary Convex 20 Bolt 30 Mortar (grout material)

Claims (6)

An apparatus for connecting the ends of two deformed reinforcing bars that are arranged in a straight line and at least one of which is a threaded reinforcing bar,
(A) a sleeve having a screw hole formed in each peripheral wall on both sides in the axial direction and an engaging convex portion formed on the inner peripheral surface on the opposite side of the screw hole;
(B) a bolt that is screwed into the screw hole of the sleeve and presses the deformed reinforcing bar against the engagement convex portion of the sleeve;
(C) In the reinforcing bar connecting device including the grout material filled in the sleeve,
The engaging convex part of the sleeve that receives the threaded reinforcing bar extends in the circumferential direction with a twist angle substantially equal to the threaded joint of the threaded reinforcing bar, and enters between the threaded joints of the threaded reinforcing bar via a gap. Filled with the grout material,
A reinforcing bar coupling device, wherein a plurality of auxiliary convex portions extending in the circumferential direction and lower than the engaging convex portions are formed apart from each other in the axial direction on the screw hole side on the inner peripheral surface of the sleeve.   2. The reinforcing bar coupling device according to claim 1, wherein a plurality of engaging convex portions that receive the threaded reinforcing bars are formed at intervals equal to or a multiple of the pitch of the screw nodes of the threaded reinforcing bars.   The reinforcing bar connecting device according to claim 1 or 2, wherein the top of the engaging convex portion of the sleeve has a substantially triangular cross section.   4. The reinforcing bar connecting device according to claim 3, wherein the inclined surface at the top of the engaging convex portion has an inclination angle substantially equal to an inclined surface of a screw node forming a trapezoidal cross section of the screw reinforcing bar. The reinforcing bar connecting device according to any one of claims 1 to 4, wherein the engaging convex part and the auxiliary convex part are connected to form a continuous spiral. It is used to connect the ends of two deformed reinforcing bars that are arranged in a straight line and at least one is a threaded reinforcing bar, and has screw holes for screwing bolts to the peripheral walls on both sides in the axial direction. In the sleeve formed with the engaging convex portion on the inner peripheral surface opposite to the screw hole,
The engaging convex portion that receives the screw rebar extends in the circumferential direction with a twist angle substantially equal to the screw node of the screw rebar, and enters through a gap between the screw nodes of the screw rebar,
In the inner peripheral surface of the sleeve, a plurality of auxiliary convex portions extending in the circumferential direction and lower than the engaging convex portions are formed on the screw hole side apart from each other in the axial direction. .

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