JP4516183B2 - Rebar connection sleeve joint - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sleeve joint for connecting a pair of reinforcing bars arranged on a straight line.
[0002]
[Prior art]
As shown in FIG. 12, the sleeve joint 1 has a cylindrical shape. A pair of deformed reinforcing bars 3 (see FIG. 13) are inserted from both ends of the sleeve joint 1. And grout material is inject | poured from one of a pair of hole 1a penetrated to the radial direction of the coupling 1, and air is extracted from the other. The grout material is filled between the inner periphery of the joint 1 and the reinforcing bar 3, whereby the pair of reinforcing bars 3 are connected. A plurality of annular protrusions 2 extending in the circumferential direction are formed on the inner periphery of the sleeve joint 1, and the adhesion strength of the grout material to the joint 1 is enhanced by the annular protrusions 2.
[0003]
[Problems to be solved by the invention]
As shown in FIGS. 13 and 14, the more eccentric the reinforcing bar 3, the smaller the thickness of the eccentric grout material and the weaker the connection strength. Therefore, for example, it is conceivable to increase the protruding height of the annular protrusion 2 and restrict the eccentric amount of the reinforcing bar 3 using the annular protrusion 2 as a stopper. However, if the protrusion height of the annular protrusion 2 is large, the grout material will not easily flow in the axial direction of the joint 1. Further, when the reinforcing bar 3 hits the annular protrusion 2, there is almost no gap between the inner peripheral edge of the annular protrusion 2 and the outer periphery of the reinforcing bar 3 over a wide range S <b> 1 in the circumferential direction around the hitting part. Therefore, the grout material cannot be filled in this wide range S1. Further, the flange 3a extending in the circumferential direction of the reinforcing bar 3 is positioned between two adjacent annular protrusions 2 over a wider range S2 in the circumferential direction. Therefore, over this wide range S2, the grout material is shortly divided in the axial direction by the fly 3a and the annular projection 2. As a result, even if the amount of eccentricity can be regulated, it is difficult to ensure the connection strength.
Further, when the reinforcing bar 3 is eccentric to the side of the hole 1a for injecting the grout material, the injection resistance increases.
[0004]
The present invention has been made in view of the above circumstances, and the first problem is to suppress the eccentricity of the reinforcing bars as much as possible without hindering the flow of the grout material in the axial direction, and there is sufficient grout material on the eccentric side. It is an object of the present invention to provide a sleeve joint that can secure connection strength.
The second problem is to provide a sleeve joint that can prevent the injection resistance from increasing due to the eccentricity of the reinforcing bar toward the grout injection hole.
[0005]
[Means for Solving the Problems]
In order to solve the first problem, the first invention is a joint body having a plurality of virtual band-like regions each having a cylindrical shape and an inner circumference divided in the circumferential direction, and each of the plurality of band-like regions. And the protrusions in the adjacent belt-like regions are separated from each other.
A second invention is characterized in that, in the first invention, a plurality of the protrusions are arranged apart from each other in the axial direction of the joint body.
A third invention is characterized in that, in the second invention, the positions of the protrusions are shifted in the axial direction between adjacent belt-like regions.
[0006]
According to a fourth invention, in any one of the first to third inventions, the protrusion extends in an axial direction of the joint body.
According to a fifth invention, in any one of the first to third inventions, the protrusion has a circular or polygonal cross section perpendicular to the protruding direction.
A sixth invention is characterized in that, in the fourth or fifth invention, the protrusion height of the protrusion decreases toward both ends along the axial direction of the joint body.
[0007]
According to a seventh invention, in any one of the first to sixth inventions, a grout injection hole penetrating in the radial direction is formed in the joint main body, and the band shape is more than the protrusion of the band-like region where the grout injection hole is located. The protrusion height of the protrusion of the belt-like region that faces the region in the radial direction is small.
According to an eighth aspect of the present invention, in the seventh aspect of the present invention, a built-up portion is formed on the inner periphery of the joint main body, the grouting hole is penetrated through the burying portion, and a belt-like region where the grouting hole is located. The protrusions protrude inward in the radial direction from the build-up portion.
[0008]
In order to solve the second problem, the ninth invention includes a joint body having a cylindrical shape and having a grout injection hole penetrating in the radial direction, and the inner periphery of the joint body has a circumferential direction. Discontinuous protrusions are arranged at substantially the same circumferential position as the grout injection hole.
[0009]
According to a tenth aspect of the present invention, in any one of the first to ninth aspects, an annular protrusion extending in a circumferential direction is further formed on the inner periphery of the joint body, and the protrusion is more radially than the annular protrusion. It is characterized by protruding inward.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show a connection structure in which a pair of deformed reinforcing bars 10 are connected by a sleeve joint 20. On the outer periphery of the deformed reinforcing bar 10, a pair of ribs 11 extending in the axial direction and a large number of bushes 12 extending in the circumferential direction are formed.
[0011]
The sleeve joint 20 includes a joint body 21 having a cylindrical shape. The cross-sectional shape of the outer periphery of the joint body 21 is a perfect circle, but may be an ellipse or a polygon such as a hexagon. The size of the joint 20 is, for example, 1.3 to 5.5 times the nominal diameter of the reinforcing bar 10 and the length is the above depending on the performance and which part of the building structure is used. It is appropriately selected within the range of 3.5 to 40.5 times the nominal diameter.
[0012]
On the inner periphery of the central portion of the joint body 21, a built-up portion 25 swelled radially inward is formed. The build-up portion 25 has a circular shape (see FIG. 3), and the raised height gradually decreases toward the periphery. The joint body 21 is formed with a grout injection hole 20a penetrating from the built-up portion 25 to the outer peripheral surface. A grout material 30 injected from the grout injection hole 20 a is filled between the sleeve joint 20 and the reinforcing bar 10. For the grout material 30, an organic grout material such as epoxy mortar is used.
[0013]
As shown in FIG.2 and FIG.3, the inner periphery of the coupling main body 21 has six virtual strip | belt-shaped area | regions R1-R6 extended in an axial direction. These strip-like regions R <b> 1 to R <b> 6 are divided every 60 degrees (equal angle) in the circumferential direction of the joint body 21. Three or four (plural) vertical projections 23 are formed at equal intervals in the axial direction in each of the belt-like regions R1 to R6. In the adjacent strip regions R1 to R6, the position of the vertical protrusion 23 is shifted in the axial direction. Instead of arranging the protrusions 23 at equal intervals in the axial direction of the joint body 21, for example, two protrusions 23 are arranged close to both ends (or between the center and the center) of the joint body 21. , It may be arranged at various intervals, such as one (or two) arranged in the center away from it.
[0014]
As shown in FIGS. 1 to 3, each vertical protrusion 23 has a plate shape and is elongated in the axial direction (discontinuous in the circumferential direction and is separated from the vertical protrusion 23 in the adjacent belt-like region). The both ends of the vertical protrusion 23 are rounded (the protruding height of the vertical protrusion 23 decreases as it goes toward both ends).
[0015]
The built-up portion 25 is disposed so as to straddle the two strip-shaped regions R1, R6, and the grout injection hole 20a is located in the strip-shaped region R1. The vertical protrusions 23 of the belt-like region R1 protrude radially inward from the built-up portion 25. In addition, the protrusion height of the vertical protrusion 23 in the belt-like region R1 is larger than that in the other regions R2 to R6. The next largest is the vertical projection 23 of the strip regions R2 and R6 adjacent to the strip region R1, and the next is the vertical projection 23 of the strip regions R3 and R5. Thus, the protrusion height of the vertical protrusion 23 in the region farther from the belt-like region R1 is smaller, and the vertical protrusion 23 of the belt-like region R4 facing the belt-like region R1 in the radial direction is the smallest. The protrusion height of the vertical protrusion 23 in the strip region R4 is larger than the protrusion height of the rib 11 of the reinforcing bar 10 and the protrusion 12 from the outer peripheral surface of the reinforcing bar 10. Note that the annular protrusions 22 at both ends of the joint body 10 may have the same protrusion height as the vertical protrusions 23 in the belt-like region R4.
[0016]
The operation will be described.
In connecting the pair of reinforcing bars 10, the reinforcing bars 10 are inserted into the sleeve joint 20 from both ends. At this time, since the end of the vertical protrusion 23 is rounded, the rebar 10 is not caught by the vertical protrusion 23. Further, since the vertical protrusion 23 extends in the axial direction, the rebar 10 can be slid along the vertical protrusion 23. Therefore, the reinforcing bar 10 can be easily inserted. As shown in FIGS. 1 and 2, the inserted reinforcing bar 10 is preferably positioned so that the sleeve joint 20 and the axis are aligned.
[0017]
Next, the grout material 30 is injected between the sleeve joint 20 and the reinforcing bar 10 through the grout injection hole 20a. At this time, the vertical projections 23 of the belt-shaped region R1 prevent the reinforcing bars 10 from being too close to the built-up portion 25 and thus the inner end of the grout injection hole 20a, so that the injection resistance of the grout material 30 is increased. And can be easily injected. The injected grout material 30 can flow between the vertical projections 23 of the adjacent strip-like regions R1 to R6 in the axial direction, and can flow between the vertical projections 23 of the strip-like regions R1 to R6 in the circumferential direction. Can do. As a result, the grout material 30 is spread evenly in the axial direction and in the circumferential direction. When the grout material 30 is hardened, the reinforcing bar 10 and the sleeve joint 20 are connected, and as a result, the pair of reinforcing bars 10 are connected.
[0018]
Since the longitudinal projection 23 is formed on the sleeve joint 20 and the rib 11 and the fistula 12 are formed on the reinforcing bar 10, the adhesion strength of the grout material 30 can be ensured. Accordingly, when a tensile force is applied to the reinforcing bar 10, this force can be reliably transmitted to the sleeve joint 20 via the grout material 30.
[0019]
Due to the force transmitted to the sleeve joint 20, stress concentration occurs around the grout injection hole 20a. Since the circumference of the grout injection hole 20a is a thick-walled portion 25, it can sufficiently withstand the stress concentration. And since the build-up part 25 is formed in the inner periphery of the coupling main body 20, it does not become a hindrance to the reinforcement work of other reinforcing bars, such as a hoop reinforcement.
[0020]
As described above, the reinforcing bar 10 is positioned so as not to be decentered as much as possible, and then grout injection is performed. However, the positioning may be insufficient and decentered. Therefore, if the protrusion heights of the protrusions 23 in each of the regions R1 to R6 are made relatively large, the protrusions 23 can serve as stoppers and can be regulated so that the reinforcing bars 10 are not greatly decentered. In addition, since the protrusions 23 are distributed in the circumferential direction of the joint main body 21, the eccentricity of the reinforcing bars 10 can be regulated over 360 degrees. Moreover, even if the protrusion height of the protrusion 23 is increased, the distribution of the grout material 30 in the axial direction is not hindered. Furthermore, as shown in FIG. 4, when the reinforcing bar 10 hits the vertical projection 23 of the strip region R4, for example, since the width of the vertical projection 23 is narrow, the strip region R4 is also connected to the reinforcing bar 10 except for this narrow range S3. A sufficient gap can be secured between them, and the grout material 30 can be filled there. As a result, the coupling strength can be sufficiently ensured also for the band-like region R4 on the eccentric side.
[0021]
As shown by the phantom line in FIG. 2, the reinforcing bar 10 may have a diameter larger than a normal dimension due to a manufacturing error. In this case, the reinforcing bar 10 is positively moved toward the band-shaped region R4 by utilizing the dimensional relationship of (projection height of the vertical protrusion 23 of the band-shaped region R1)> (projection height of the vertical protrusion 23 of the band-shaped region R4). Position it with a bias. As a result, the distance between the reinforcing bar 10 and the grout injection hole 20a can be secured to the same extent as in the case of the normal size, and the injection resistance does not increase.
[0022]
Next, another embodiment of the present invention will be described. In the following embodiments, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.
5 and 6 show a second embodiment of the present invention. In this embodiment, a plurality of annular protrusions 22 extending in the circumferential direction are formed on the inner periphery of the joint body 21. These annular protrusions 22 are arranged at equal intervals in the axial direction of the joint body 21. The protrusion height of the annular protrusion 22 is smaller than the vertical protrusion 23 of the strip-shaped region R4 which is the smallest among the vertical protrusions 23.
[0023]
Therefore, when the reinforcing bar 10 is inserted, the reinforcing bar 10 is not caught by the annular protrusion 21. Moreover, as shown in FIG. 7, even when the reinforcing bar 10 is decentered toward the band-shaped region R4, for example, the reinforcing bar 10 does not hit the annular protrusion 22, and the grout material 30 can be filled between them. In addition, the range S4 in which the annular protrusion 22 and the fistula 12 of the reinforcing bar 10 overlap in the axial direction also becomes smaller as the reinforcing bar 10 is separated from the annular protrusion 22. Therefore, even if the annular protrusion 22 is provided, the connection strength can be maintained for the band-like region R4 on the side where the reinforcing bar 10 is eccentric. Further, the adhesion strength of the grout material 30 can be further increased by the annular protrusion 22.
[0024]
8 and 9 show a third embodiment of the present invention. In this embodiment, the inner periphery of the joint body 20 has eight band regions R1～R 8. In each of the belt-like regions R <b> 1 to R <b> 8 , a spherical protrusion 24 having a spherical shape (a cross-sectional true circle) is provided instead of the vertical protrusion 23. Similar to the vertical protrusions 23, the spherical protrusions 24 are alternately arranged in the form of scattered dots over the entire inner periphery of the joint body 21. A spherical protrusion 24 whose arrangement position overlaps with the annular protrusion 22 protrudes from the annular protrusion 22. The build-up portion 25 straddles the four belt-like regions R 8 , R 1 to R 3, and a spherical protrusion 24 whose arrangement position overlaps with the build-up portion 25 protrudes from the build-up portion 25. The grout injection hole 20a is located across the two strip regions R1, R2 (first strip region). Although the detailed illustration is omitted, the protrusion height of the spherical protrusion 24 is the largest in the above-described two belt-like regions R1 and R2, and the height of the belt-like region R6 (second belt-like region) opposed to these in the radial direction. Smallest.
Since the spherical protrusion 24 does not extend in the axial direction as well as the circumferential direction of the joint body 20, the grout material 30 easily flows in the circumferential direction.
[0025]
10 and 11 show a fourth embodiment of the present invention. In this embodiment, the vertical protrusion 23 is provided only in the belt-like region R1 where the grout injection hole 20a is located. (A non-annular protrusion 23 discontinuous in the circumferential direction is formed on the inner circumference of the joint body 21 only at the same circumferential position as the grout injection hole 20a.) As shown by the phantom line in FIG. In addition, when the reinforcing bar 10 tries to be eccentric toward the grout injection hole 20a, it is prevented from hitting the vertical projection 23 and being too close to the inner end of the grout injection hole 20a. Thereby, an increase in injection resistance of the grout material 30 can be prevented.
[0026]
The present invention is not limited to the above-described embodiment, and various forms can be adopted.
For example, the grout material may be inorganic.
The build-up portion may have an annular shape extending in the circumferential direction of the joint body.
In 1st-3rd embodiment, you may make the protrusion height of all the protrusions 23 and 24 mutually the same.
In 1st, 2nd, 4th embodiment, you may make the length of the vertical protrusion 23 larger than the space | interval of the fistula 12 of the reinforcing bar 10. FIG. Then, the eccentricity of the reinforcing bar 10 can be prevented at the position where the fistula 12 hits the vertical projection 23, and the eccentricity does not occur until the outer periphery of the reinforcing bar 10 hits the vertical projection 23. Further, the vertical protrusion 23 may be formed over the entire length of the joint body 21.
In the fourth embodiment, the vertical protrusion 23 may be replaced with the same spherical protrusion 24 as in the third embodiment.
The cross-sectional shape orthogonal to the protruding direction of the spherical protrusion 24 may be an elliptical shape, and may be a polygonal shape such as a triangle or any other shape instead of a spherical shape.
[0027]
【The invention's effect】
As described above, in the first invention, the eccentricity of the reinforcing bar can be suppressed as much as possible without hindering the axial distribution of the grout material, and the grout material can be sufficiently distributed to the eccentric side. Thus, the connection strength can be ensured.
In 2nd invention, grout material can be distribute | circulated in the circumferential direction through between the protrusions of each strip | belt-shaped area | region.
In 3rd invention, protrusion can be arrange | positioned substantially uniformly over the whole region of a coupling main body.
In the fourth invention, the rebar can be slid along the projection and inserted easily.
In the fifth invention, the grout material can be more easily spread both in the axial direction and in the circumferential direction.
In 6th invention, it can insert easily, without hooking a reinforcing bar to protrusion.
In the seventh aspect of the invention, the distance between the grout injection hole and the reinforcing bar can be ensured regardless of the eccentricity of the reinforcing bar and the manufacturing error to prevent an increase in the injection resistance, and also on the side facing the grout injection hole in the radial direction. Space that can be filled with grout material can be secured.
In the eighth invention, it is possible to secure an interval between the build-up portion and the reinforcing bar and prevent an increase in injection resistance. Further, the build-up portion can sufficiently withstand the stress concentration on the grout injection hole. Furthermore, it does not obstruct other bar reinforcement work.
The ninth invention can prevent an increase in injection resistance due to eccentricity of the reinforcing bar to the grout injection hole side.
In the tenth invention, the adhesion strength of the grout material can be further increased by the annular protrusion.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a connection structure according to a first embodiment of the present invention.
2 is a cross-sectional view taken along the line II-II of FIG. 1 showing the connection structure in a state before the grout material is injected.
FIG. 3 is a development view of an inner periphery of a sleeve joint having the above-described connection structure.
FIG. 4 is a cross-sectional view of the connection structure when a reinforcing bar is eccentric.
FIG. 5 is a longitudinal sectional view of a connection structure according to a second embodiment of the present invention.
6 is a cross-sectional view taken along the line VI-VI in FIG. 6 showing the connection structure of the second embodiment in a state before the grout material is injected.
FIG. 7 is a cross-sectional view of the connection structure of the second embodiment when a reinforcing bar is eccentric.
FIG. 8 is a development view of the inner periphery of a sleeve joint according to a third embodiment of the present invention.
9 is a cross-sectional view of the sleeve joint taken along line IX-IX in FIG.
FIG. 10 is a longitudinal sectional view of a connection structure according to a fourth embodiment of the present invention.
11 is a cross-sectional view taken along the line XI-XI of FIG. 11 showing the connection structure of the fourth embodiment in a state before injecting the grout material.
FIG. 12 is a longitudinal sectional view of a conventional sleeve joint.
FIG. 13 is an enlarged longitudinal sectional view showing a connection structure using the conventional sleeve joint in a state where a reinforcing bar is eccentric.
14 is a cross-sectional view taken along line XIV-XIV in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Deformed bar 20 Sleeve joint 20a Grout injection hole 21 Joint main body 22 Annular projection 23 Vertical projection 24 Spherical projection 25 Build-up part R1-R9 Strip-like area

Claims (7)

A joint body having a cylindrical shape and having an inner periphery having a plurality of virtual strip-shaped regions divided in the circumferential direction, and a protrusion formed in each of the plurality of strip- shaped regions, Are arranged in a line apart from each other in the axial direction of the joint body, and the extending direction of each protrusion is along the axial direction, and the protrusions adjacent to each other in the circumferential direction are separated from each other in parallel. A sleeve joint for connecting reinforcing bars. A joint body having a cylindrical shape and an inner periphery having a plurality of virtual strip-shaped regions divided in the circumferential direction, and projections formed in each of the plurality of strip-shaped regions, the projections of adjacent strip-shaped regions The grouting hole that penetrates in the radial direction is formed in the joint body, and the protrusion height of the protrusion in the band region that is radially opposed to the band region is larger than the protrusion in the band region where the grouting hole is located. Is formed on the inner periphery of the joint body, the grout injection hole penetrates the buildup part, and the protrusion of the belt-like region where the grout injection hole is located is more than the buildup part. A sleeve joint for connecting reinforcing bars, characterized by projecting radially inward. A joint body having a cylindrical shape and an inner periphery having a plurality of virtual strip-shaped regions divided in the circumferential direction, and projections formed in each of the plurality of strip-shaped regions, the projections of adjacent strip-shaped regions A rebar connecting sleeve joint, wherein an annular protrusion extending in the circumferential direction is further formed on the inner periphery of the joint body, and the protrusion protrudes radially inward from the annular protrusion. . The reinforcing bar connecting sleeve joint according to any one of claims 1 to 3, wherein the positions of the protrusions are shifted in the axial direction between adjacent belt-like regions. 3. The reinforcing bar connecting sleeve joint according to claim 2 , wherein the protrusion has a circular or polygonal cross section perpendicular to the protruding direction. Protrusion height of the protrusion, reinforcing bar connecting sleeve joint according to claim 1 or 5, characterized that it is smaller toward both ends along the axial direction of the joint body. A joint main body having a cylindrical shape and having a grout injection hole penetrating in the radial direction is provided, and a discontinuous protrusion in the circumferential direction is provided on the inner periphery of the joint main body in substantially the same circumferential direction as the grout injection hole. The rebar connecting sleeve joint according to claim 3, wherein the sleeve joint is disposed at a position.

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